1 GNU C Library NEWS -- history of user-visible changes.
2 Copyright (C) 1992-2023 Free Software Foundation, Inc.
3 See the end for copying conditions.
5 Please send GNU C library bug reports via <https://sourceware.org/bugzilla/>
6 using `glibc' in the "product" field.
12 * struct statvfs now has an f_type member, equal to the f_type statfs member;
13 on the Hurd this was always available under a reserved name,
14 and under Linux a spare has been allocated: it was always zero
15 in previous versions of glibc, and zero is not a valid result.
17 * On Linux, the functions posix_spawnattr_getcgroup_np and
18 posix_spawnattr_setcgroup_np have been added, along with the
19 POSIX_SPAWN_SETCGROUP flag. They allow posix_spawn and posix_spawnp
20 to set the cgroupv2 in the new process in a race-free manner. These
21 functions are GNU extensions and require a kernel with clone3 support.
23 Deprecated and removed features, and other changes affecting compatibility:
25 [Add deprecations, removals and changes affecting compatibility here]
27 Changes to build and runtime requirements:
29 * Building on LoongArch requires at a minimum binutils 2.41 for vector
32 Security related changes:
34 [Add security related changes here]
36 The following bugs are resolved with this release:
38 [The release manager will add the list generated by
39 scripts/list-fixed-bugs.py just before the release.]
45 * When C2X features are enabled and the base argument is 0 or 2, the
46 following functions support binary integers prefixed by 0b or 0B as
47 input: strtol, strtoll, strtoul, strtoull, strtol_l, strtoll_l,
48 strtoul_l, strtoull_l, strtoimax, strtoumax, strtoq, strtouq, wcstol,
49 wcstoll, wcstoul, wcstoull, wcstol_l, wcstoll_l, wcstoul_l,
50 wcstoull_l, wcstoimax, wcstoumax, wcstoq, wcstouq. Similarly, the
51 following functions support binary integers prefixed by 0b or 0B as
52 input to the %i format: fscanf, scanf, sscanf, vscanf, vsscanf,
53 vfscanf, fwscanf, wscanf, swscanf, vfwscanf, vwscanf, vswscanf; those
54 functions also support the %b format for binary integers, with or
55 without such a prefix and independent of standards mode.
57 * PRIb*, PRIB* and SCNb* macros from C2X have been added to
60 * printf-family functions now support the wN format length modifiers for
61 arguments of type intN_t, int_leastN_t, uintN_t or uint_leastN_t (for
62 example, %w32d to print int32_t or int_least32_t in decimal, or %w32x
63 to print uint32_t or uint_least32_t in hexadecimal) and the wfN format
64 length modifiers for arguments of type int_fastN_t or uint_fastN_t, as
65 specified in draft ISO C2X.
67 * A new tunable, glibc.pthread.stack_hugetlb, can be used to disable
68 Transparent Huge Pages (THP) in stack allocation at pthread_create.
70 * Support for x86_64 running on Hurd has been added. This port requires
71 as least binutils 2.40 and GCC 13:
75 * Vector math library libmvec support has been added to AArch64. It
76 requires GCC version >= 10.1.0. It can be disabled via
77 "--disable-mathvec", however that is not a supported configuration as
78 it changes the ABI. The symbol names follow the AArch64 vector ABI,
79 they are declared in math.h and have to be called manually at this point.
81 * The strlcpy and strlcat functions have been added. They are derived
82 from OpenBSD, and are expected to be added to a future POSIX version.
84 * A new configure option, "--enable-fortify-source", can be used to build the
85 GNU C Library with _FORTIFY_SOURCE. The level of fortification can either be
86 provided, or is set to the highest value supported by the compiler. If not
87 explicitly enabled, then fortify source is forcibly disabled so to keep
88 original behavior unchanged.
90 Deprecated and removed features, and other changes affecting compatibility:
92 * libcrypt is no longer built by default; one may use the "--enable-crypt"
93 option to build libcrypt. libcrypt is likely to be removed from the
94 GNU C Library in a future release, so it is recommended that
95 applications port away from it to an alternative such as libxcrypt.
97 * In the Linux kernel for the hppa/parisc architecture some of the
98 MADV_XXX constants were changed to have the same values as the other
99 architectures. New programs compiled with this glibc version and which
100 use the madvise call will require at least Linux kernel version 6.2,
101 alternatively stable kernels from versions 6.1.6, 5.15.87, 5.10.163,
102 5.4.228, 4.19.270 or 4.14.303.
104 * The "--disable-experimental-malloc" option is no longer available. The
105 per-thread cache can still be disabled per-application using tunables
106 (glibc.malloc.tcache_count set to zero).
108 * The configure option "--enable-tunables" has been removed. The tunable
109 feature is now always enabled.
111 Changes to build and runtime requirements:
113 * Building libmvec on AArch64 requires at a minimum GCC 10.1.0 for SVE
116 Security related changes:
118 CVE-2023-25139: When the printf family of functions is called with a
119 format specifier that uses an <apostrophe> (enable grouping) and a
120 minimum width specifier, the resulting output could be larger than
121 reasonably expected by a caller that computed a tight bound on the
122 buffer size. The resulting larger than expected output could result
123 in a buffer overflow in the printf family of functions.
125 The following bugs are resolved with this release:
127 [178] string: Please add strlcpy and strlcat (attached)
128 [14697] nptl: Behavior of exit is nonconformant with respect to
130 [15142] stdio: Missing locking in _IO_cleanup
131 [18096] glob: null deref in wordexp/parse_dollars/parse_arith
132 [18906] stdio: fopen: ccs value may affect open mode
133 [24466] stdio: Feature request: provide special printf formats for
135 [25457] nss: hosts lookup fails for ipv4mapped ipv6 addresses
136 [28519] libc: system and popen should pass "--" between /bin/sh and
138 [29016] stdio: popen() sets errno to ENOMEM when shell does not exist
139 [29591] string: wcsnlen length can overflow in page cross case.
140 [30053] time: strftime %s returns -1 after 2038 on 32 bits systems
141 [30068] stdio: incorrect printf output for integers with thousands
142 separator and width field (CVE-2023-25139)
143 [30111] time: support_descriptors_list fails after 2038 on 32 bits
145 [30125] dynamic-link: [regression, bisected] glibc-2.37 creates new
146 symlink for libraries without soname
147 [30130] math: [s390] The _FPU_SETCW macro yields compile error with
149 [30156] time: Potential ntp_gettime abi break
150 [30235] libc: Missing fallback in getlogin if loginuid is unset
151 [30258] dynamic-link: sprof cannot read and display shared object
152 profiling data correctly
153 [30263] libc: Add test coverage for abs(), labs(), and llabs().
154 [30305] math: Incorrect asm constraint in feraiseexcept on x86-64
155 [30402] libc: FAIL: elf/tst-glibcelf
156 [30425] dynamic-link: Symbol lookup during dlclose may fail
158 [30435] dynamic-link: Root dir wrongly marked as nonexist in open_path
159 [30477] libc: [RISCV]: time64 does not work on riscv32
160 [30515] dynamic-link: _dl_find_object incorrectly returns 1 during
162 [30527] network: resolv_conf lock not unlocked on allocation failure
163 [30550] math: powerpc64le: GCC-specific code for isinf() is being used
165 [30555] string: strerror can incorrectly return NULL
166 [30579] malloc: trim_threshold in realloc lead to high memory usage
167 [30662] nscd: Group and password cache use errno in place of errval
173 * The getent tool now supports the --no-addrconfig option. The output of
174 getent with --no-addrconfig may contain addresses of families not
175 configured on the current host i.e. as-if you had not passed
176 AI_ADDRCONFIG to getaddrinfo calls.
178 Deprecated and removed features, and other changes affecting compatibility:
180 * The dynamic linker no longer loads shared objects from the "tls"
181 subdirectories on the library search path or the subdirectory that
182 corresponds to the AT_PLATFORM system name, or employs the legacy AT_HWCAP
183 search mechanism, which was deprecated in version 2.33.
185 Security related changes:
187 CVE-2022-39046: When the syslog function is passed a crafted input
188 string larger than 1024 bytes, it reads uninitialized memory from the
189 heap and prints it to the target log file, potentially revealing a
190 portion of the contents of the heap.
192 The following bugs are resolved with this release:
194 [12154] network: Cannot resolve hosts which have wildcard aliases
195 [12165] libc: readdir: Do not skip entries with zero d_ino values
196 [19444] build: build failures with -O1 due to -Wmaybe-uninitialized
197 [24774] nptl: pthread_rwlock_timedwrlock stalls on ARM
198 [24816] nss: nss/tst-nss-files-hosts-long fails when no interface has
199 AF_INET6 address (ie docker)
200 [27087] stdio: PowerPC: Redefinition error with Clang from IEEE
202 [28846] network: CMSG_NXTHDR may trigger -Wstrict-overflow warning
203 [28937] dynamic-link: New DSO dependency sorter does not put new map
205 [29249] libc: csu/libc-tls.c:202: undefined reference to
206 `_startup_fatal_not_constant'
207 [29305] network: Inefficient buffer space usage in nss_dns for
208 gethostbyname and other functions
209 [29375] libc: don't hide MAP_ANONYMOUS behind _GNU_SOURCE
210 [29402] nscd: nscd: No such file or directory
211 [29415] nscd: getaddrinfo with AI_ADDRCONFIG returns addresses with
213 [29427] dynamic-link: Inconsistency detected by ld.so: dl-printf.c:
214 200: _dl_debug_vdprintf: Assertion `! "invalid format specifier"'
216 [29463] math: math/test-float128-y1 fails on x86_64
217 [29485] build: Make hangs when the test misc/tst-pidfile returns
219 [29490] dynamic-link: [bisected] new __brk_call causes dynamic loader
221 [29499] build: Check failed on misc/tst-glibcsyscalls while building
222 for RISCV64 on a unmatched hardware
223 [29501] build: Check failed on stdlib/tst-strfrom while building for
224 RISCV64 on a unmatched hardware
225 [29502] libc: alpha sys/acct.h out of date
226 [29514] build: Need to use -fPIE not -fpie
227 [29528] dynamic-link: __libc_early_init not called after dlmopen that
229 [29536] libc: syslog fail to create large messages (CVE-2022-39046)
230 [29537] libc: [2.34 regression]: Alignment issue on m68k when using
232 [29539] libc: LD_TRACE_LOADED_OBJECTS changed how vDSO library are
234 [29544] libc: Regression in syslog(3) calls breaks RFC due to extra
236 [29564] build: Incorrect way to change MAKEFLAGS in Makerules
237 [29576] build: librtld.os: in function `_dl_start_profile':
238 (.text+0x9444): undefined reference to `strcpy'
239 [29578] libc: Definition of SUN_LEN() is wrong
240 [29583] build: iconv failures on 32bit platform due to missing large
242 [29600] dynamic-link: dlmopen hangs after loading certain libraries
243 [29604] localedata: Update locale data to Unicode 15.0.0
244 [29605] nscd: Regression in NSCD backend of getaddrinfo
245 [29607] nscd: nscd repeatably crashes calling __strlen_avx2 when hosts
247 [29611] string: Optimized AVX2 string functions unconditionally use
249 [29624] malloc: errno is not cleared when entering main
250 [29638] libc: stdlib: arc4random fallback is never used
251 [29657] libc: Incorrect struct stat for 64-bit time on linux/generic
253 [29698] build: Configuring for AArch32 on ARMv8+ disables
255 [29727] locale: __strtol_internal out-of-bounds read when parsing
257 [29730] libc: broken y2038 support in fstatat on MIPS N64
258 [29746] libc: ppoll() does not switch to __ppoll64 when
259 -D_TIME_BITS=64 and -D_FORTIFY_SOURCE=2 is given on 32bit
260 [29771] libc: Restore IPC_64 support in sysvipc *ctl functions
261 [29780] build: possible parallel make issue in glibc-2.36 (siglist-
262 aux.S: No such file or directory)
263 [29864] libc: __libc_start_main() should obtain program headers
264 address (_dl_phdr) from the auxv, not the ELF header.
265 [29951] time: daylight variable not set correctly if last DST change
266 coincides with offset change
267 [30039] stdio: __vsprintf_internal does not handle unspecified buffer
268 length in fortify mode
274 * Support for DT_RELR relative relocation format has been added to
275 glibc. This is a new ELF dynamic tag that improves the size of
276 relative relocations in shared object files and position independent
277 executables (PIE). DT_RELR generation requires linker support for
278 -z pack-relative-relocs option, which is supported for some targets
279 in recent binutils versions. Lazy binding doesn't apply to DT_RELR.
281 * On Linux, the pidfd_open, pidfd_getfd, and pidfd_send_signal functions
282 have been added. The pidfd functionality provides access to a process
283 while avoiding the issue of PID reuse on traditional Unix systems.
285 * On Linux, the process_madvise function has been added. It has the
286 same functionality as madvise but alters the target process identified
289 * On Linux, the process_mrelease function has been added. It allows a
290 caller to release the memory of a dying process. The release of the
291 memory is carried out in the context of the caller, using the caller's
292 CPU affinity, and priority with CPU usage accounted to the caller.
294 * The “no-aaaa” DNS stub resolver option has been added. System
295 administrators can use it to suppress AAAA queries made by the stub
296 resolver, including AAAA lookups triggered by NSS-based interfaces
297 such as getaddrinfo. Only DNS lookups are affected: IPv6 data in
298 /etc/hosts is still used, getaddrinfo with AI_PASSIVE will still
299 produce IPv6 addresses, and configured IPv6 name servers are still
300 used. To produce correct Name Error (NXDOMAIN) results, AAAA queries
301 are translated to A queries. The new resolver option is intended
302 primarily for diagnostic purposes, to rule out that AAAA DNS queries
303 have adverse impact. It is incompatible with EDNS0 usage and DNSSEC
304 validation by applications.
306 * On Linux, the fsopen, fsmount, move_mount, fsconfig, fspick, open_tree,
307 and mount_setattr have been added. They are part of the new Linux kernel
308 mount APIs that allow applications to more flexibly configure and operate
309 on filesystem mounts. The new mount APIs are specifically designed to work
312 * localedef now accepts locale definition files encoded in UTF-8.
313 Previously, input bytes not within the ASCII range resulted in
314 unpredictable output.
316 * Support for the mbrtoc8 and c8rtomb multibyte/UTF-8 character conversion
317 functions has been added per the ISO C2X N2653 and C++20 P0482R6 proposals.
318 Support for the char8_t typedef has been added per the ISO C2X N2653
319 proposal. The functions are declared in uchar.h in C2X mode or when the
320 _GNU_SOURCE macro or C++20 __cpp_char8_t feature test macro is defined.
321 The char8_t typedef is declared in uchar.h in C2X mode or when the
322 _GNU_SOURCE macro is defined and the C++20 __cpp_char8_t feature test macro
323 is not defined (if __cpp_char8_t is defined, then char8_t is a builtin type).
325 * The functions arc4random, arc4random_buf, and arc4random_uniform have been
326 added. The functions wrap getrandom and/or /dev/urandom to return high-
327 quality randomness from the kernel.
329 * Support for LoongArch running on Linux has been added. This port requires
330 as least binutils 2.38, GCC 12, and Linux 5.19. Currently only hard-float
333 - loongarch64-linux-gnu
335 The LoongArch ABI is 64-bit little-endian.
337 Deprecated and removed features, and other changes affecting compatibility:
339 * Support for prelink will be removed in the next release; this includes
340 removal of the LD_TRACE_PRELINKING, and LD_USE_LOAD_BIAS, environment
341 variables and their functionality in the dynamic loader.
343 * The Linux kernel version check has been removed along with the
344 LD_ASSUME_KERNEL environment variable. The minimum kernel used to built
345 glibc is still provided through NT_GNU_ABI_TAG ELF note and also printed
346 when libc.so is issued directly.
348 * On Linux, The LD_LIBRARY_VERSION environment variable has been removed.
350 The following bugs are resolved with this release:
352 [14932] dynamic-link: dlsym(handle, "foo") and dlsym(RTLD_NEXT, "foo")
353 return different result with versioned "foo"
354 [16355] libc: syslog.h's SYSLOG_NAMES namespace violation and utter
356 [23293] dynamic-link: aarch64: getauxval is broken when run as ld.so
357 ./exe and ld.so adjusts argv on the stack
358 [24595] nptl: [2.28 Regression]: Deadlock in atfork handler which
360 [25744] locale: mbrtowc with Big5-HKSCS returns 2 instead of 1 when
361 consuming the second byte of certain double byte characters
362 [25812] stdio: Libio vtable protection is sometimes only partially
364 [27054] libc: pthread_atfork handlers that call pthread_atfork
366 [27924] dynamic-link: ld.so: Support DT_RELR relative relocation
368 [28128] build: declare_symbol_alias doesn't work for assembly codes
369 [28566] network: getnameinfo with NI_NOFQDN is not thread safe
370 [28752] nss: Segfault in getpwuid when stat fails
371 [28815] libc: realpath should not copy to resolved buffer on error
372 [28828] stdio: fputwc crashes
373 [28838] libc: FAIL: elf/tst-p_align3
374 [28845] locale: ld-monetary.c should be updated to match ISO C and
376 [28850] libc: linux: __get_nprocs_sched reads uninitialized memory
378 [28852] libc: getaddrinfo leaks memory with AI_ALL
379 [28853] libc: tst-spawn6 changes current foreground process group
380 (breaks test isolation)
381 [28857] libc: FAIL: elf/tst-audit24a
382 [28860] build: --enable-kernel=5.1.0 build fails because of missing
383 __convert_scm_timestamps
384 [28865] libc: linux: _SC_NPROCESSORS_CONF and _SC_NPROCESSORS_ONLN are
385 inaccurate without /sys and /proc
386 [28868] dynamic-link: Dynamic loader DFS algorithm segfaults on
388 [28880] libc: Program crashes if date beyond 2038
389 [28883] libc: sysdeps/unix/sysv/linux/select.c: __select64
390 !__ASSUME_TIME64_SYSCALLS && !__ASSUME_PSELECT fails on Microblaze
391 [28896] string: strncmp-avx2-rtm and wcsncmp-avx2-rtm fallback on non-
392 rtm variants when avoiding overflow
393 [28922] build: The .d dependency files aren't always generated
394 [28931] libc: hosts lookup broken for SUCCESS=CONTINUE and
396 [28936] build: nm: No such file
397 [28950] localedata: Add locale for ISO code "tok" (Toki Pona)
398 [28953] nss: NSS lookup result can be incorrect if function lookup
400 [28970] math: benchtest: libmvec benchmark doesn't build with make
402 [28991] libc: sysconf(_SC_NPROCESSORS_CONF) should read
403 /sys/devices/system/cpu/possible
404 [28993] libc: closefrom() iterates until max int if no access to
406 [28996] libc: realpath fails to copy partial result to resolved buffer
408 [29027] math: [ia64] fabs fails with sNAN input
409 [29029] nptl: poll() spuriously returns EINTR during thread
410 cancellation and with cancellation disabled
411 [29030] string: GLIBC 2.35 regression - Fortify crash on certain valid
412 uses of mbsrtowcs (*** buffer overflow detected ***: terminated)
413 [29062] dynamic-link: Memory leak in _dl_find_object_update if object
414 is promoted to global scope
415 [29069] libc: fstatat64_time64_statx wrapper broken on MIPS N32 with
416 -D_FILE_OFFSET_BITS=64 and -D_TIME_BITS=64
417 [29071] dynamic-link: m68k: Removal of ELF_DURING_STARTUP optimization
419 [29097] time: fchmodat does not handle 64 bit time_t for
421 [29109] libc: posix_spawn() always returns 1 (EPERM) on clone()
423 [29141] libc: _FORTIFY_SOURCE=3 fail for gcc 12/glibc 2.35
424 [29162] string: [PATCH] string.h syntactic error:
425 include/bits/string_fortified.h:110: error: expected ',' or ';'
426 before '__fortified_attr_access'
427 [29165] libc: [Regression] broken argv adjustment
428 [29187] dynamic-link: [regression] broken argv adjustment for nios2
429 [29193] math: sincos produces a different output than sin/cos
430 [29197] string: __strncpy_power9() uses uninitialised register vs18
431 value for filling after \0
432 [29203] libc: daemon is not y2038 aware
433 [29204] libc: getusershell is not 2038 aware
434 [29207] libc: posix_fallocate fallback implementation is not y2038
436 [29208] libc: fpathconf(_PC_ASYNC_IO) is not y2038 aware
437 [29209] libc: isfdtype is not y2038 aware
438 [29210] network: ruserpass is not y2038 aware
439 [29211] libc: __open_catalog is not y2038 aware
440 [29213] libc: gconv_parseconfdir is not y2038 aware
441 [29214] nptl: pthread_setcanceltype fails to set type
442 [29225] network: Mistyped define statement in socket/sys/socket.h in
444 [29274] nptl: __read_chk is not a cancellation point
445 [29279] libc: undefined reference to `mbstowcs_chk' after
446 464d189b9622932a75302290625de84931656ec0
447 [29304] libc: mq_timedreceive does not handle 64 bit syscall return
448 correct for !__ASSUME_TIME64_SYSCALLS
449 [29403] libc: st_atim, st_mtim, st_ctim stat struct members are
450 missing on microblaze with largefile
456 * Unicode 14.0.0 Support: Character encoding, character type info, and
457 transliteration tables are all updated to Unicode 14.0.0, using
458 generator scripts contributed by Mike FABIAN (Red Hat).
460 * Bump r_version in the debugger interface to 2 and add a new field,
461 r_next, support multiple namespaces.
463 * Support for the C.UTF-8 locale has been added to glibc. The locale
464 supports full code-point sorting for all valid Unicode code points. A
465 limitation in the framework for fnmatch, regexec, and regcomp requires
466 a compromise to save space and only ASCII-based range expressions are
467 supported for now (see bug 28255). The full size of the locale is
468 only ~400KiB, with 346KiB coming from LC_CTYPE information for
469 Unicode. This locale harmonizes downstream C.UTF-8 already shipping
470 in various downstream distributions. The locale is not built into
471 glibc, and must be installed.
473 * <math.h> functions that round their results to a narrower type, and
474 corresponding <tgmath.h> macros, are added from TS 18661-1:2014, TS
475 18661-3:2015 and draft ISO C2X:
477 - fsqrt, fsqrtl, dsqrtl and corresponding fMsqrtfN, fMsqrtfNx,
478 fMxsqrtfN and fMxsqrtfNx functions.
480 - ffma, ffmal, dfmal and corresponding fMfmafN, fMfmafNx, fMxfmafN and
483 * <math.h> functions for floating-point maximum and minimum,
484 corresponding to new operations in IEEE 754-2019, and corresponding
485 <tgmath.h> macros, are added from draft ISO C2X: fmaximum,
486 fmaximum_num, fmaximum_mag, fmaximum_mag_num, fminimum, fminimum_num,
487 fminimum_mag, fminimum_mag_num and corresponding functions for float,
488 long double, _FloatN and _FloatNx.
490 * <math.h> macros for single-precision float constants are added as a
491 GNU extension: M_Ef, M_LOG2Ef, M_LOG10Ef, M_LN2f, M_LN10f, M_PIf,
492 M_PI_2f, M_PI_4f, M_1_PIf, M_2_PIf, M_2_SQRTPIf, M_SQRT2f and
495 * The __STDC_IEC_60559_BFP__ and __STDC_IEC_60559_COMPLEX__ macros are
496 predefined as specified in TS 18661-1:2014.
498 * The exp10 functions in <math.h> now have a corresponding type-generic
501 * The ISO C2X macro _PRINTF_NAN_LEN_MAX has been added to <stdio.h>.
503 * printf-family functions now support the %b format for output of
504 integers in binary, as specified in draft ISO C2X, and the %B variant
505 of that format recommended by draft ISO C2X.
507 * A new DSO sorting algorithm has been added in the dynamic linker that uses
508 topological sorting by depth-first search (DFS), solving performance issues
509 of the existing sorting algorithm when encountering particular circular
510 object dependency cases.
512 * A new tunable, glibc.rtld.dynamic_sort, can be used to select between
513 the two DSO sorting algorithms. The default setting of '2' uses the
514 new DFS-based algorithm. The setting '1' switches to the old
515 algorithm used in glibc 2.33 and earlier.
517 * ABI support for a new function '__memcmpeq'. '__memcmpeq' is meant
518 to be used by compilers for optimizing usage of 'memcmp' when its
519 return value is only used for its boolean status.
521 * Support for automatically registering threads with the Linux rseq
522 system call has been added. This system call is implemented starting
523 from Linux 4.18. The Restartable Sequences ABI accelerates user-space
524 operations on per-cpu data. It allows user-space to perform updates
525 on per-cpu data without requiring heavy-weight atomic operations.
526 Automatically registering threads allows all libraries, including
527 libc, to make immediate use of the rseq support by using the
528 documented ABI, via the __rseq_flags, __rseq_offset, and __rseq_size
529 variables. The GNU C Library manual has details on integration of
530 Restartable Sequences.
532 * A symbolic link to the dynamic linker is now installed under
533 /usr/bin/ld.so (or more precisely, '${bindir}/ld.so').
535 * All programs and the testsuite in glibc are now built as position independent
536 executables (PIE) by default on toolchains and architectures that support it.
537 Further, if the toolchain and architecture supports it, even static programs
538 are built as PIE and the resultant glibc can be used to build static PIE
539 executables. A new option --disable-default-pie has been added to disable
540 this behavior and get a non-PIE build. This option replaces
541 --enable-static-pie, which no longer has any effect on the build
544 * On Linux, a new tunable, glibc.malloc.hugetlb, can be used to
545 either make malloc issue madvise plus MADV_HUGEPAGE on mmap and sbrk
546 or to use huge pages directly with mmap calls with the MAP_HUGETLB
547 flags). The former can improve performance when Transparent Huge Pages
548 is set to 'madvise' mode while the latter uses the system reserved
551 * The printf family of functions now handles the flagged %#m conversion
552 specifier, printing errno as an error constant (similar to strerrorname_np).
554 * The function _dl_find_object has been added. In-process unwinders
555 can use it to efficiently locate unwinding information for a code
558 * Support for OpenRISC running on Linux has been added. This port requires
559 as least binutils 2.35, GCC 11, and Linux 5.4. Currently only soft-float
564 The OpenRISC ABI is 32-bit big-endian and uses 64-bit time (y2038 safe) and
565 64-bit file offsets (LFS default).
567 * A new configure option, --with-rtld-early-cflags, can be used to
568 specify additional compiler flags for building the early startup code
569 of the dynamic linker. On targets which have CPU compatibility
570 checks, this can help to ensure that proper diagnostics are printed if
571 the dynamic loader runs on an incompatible CPU.
573 * On Linux, the epoll_pwait2 function has been added. It is similar to
574 epoll_wait with the difference the timeout has nanoseconds resolution.
576 * The function posix_spawn_file_actions_addtcsetpgrp_np has been added,
577 enabling posix_spawn and posix_spawnp to set the controlling terminal in
578 the new process in a race free manner. This function is a GNU extension.
580 * Source fortification (_FORTIFY_SOURCE) level 3 is now available for
581 applications compiling with glibc and gcc 12 and later. Level 3 leverages
582 the __builtin_dynamic_object_size function to deliver additional
583 fortification balanced against additional runtime cost (checking non-constant
586 * The audit libraries will avoid unnecessary slowdown if it is not required
587 PLT tracking (by not implementing the la_pltenter or la_pltexit callbacks).
589 Deprecated and removed features, and other changes affecting compatibility:
591 * On x86-64, the LD_PREFER_MAP_32BIT_EXEC environment variable support
592 has been removed since the first PT_LOAD segment is no longer executable
593 due to defaulting to -z separate-code.
595 * The r_version update in the debugger interface makes the glibc binary
596 incompatible with GDB binaries built without the following commits:
598 c0154a4a21a gdb: Don't assume r_ldsomap when r_version > 1 on Linux
599 4eb629d50d4 gdbserver: Check r_version < 1 for Linux debugger interface
601 when audit modules or dlmopen are used.
603 * Intel MPX support (lazy PLT, ld.so profile, and LD_AUDIT) has been removed.
605 * The --enable-static-pie option is no longer available. The glibc build
606 configuration script now automatically detects static-pie support in the
607 toolchain and architecture and enables it if available.
609 * The catchsegv script and associated libSegFault.so shared object have
610 been removed. There are widely-deployed out-of-process alternatives for
611 catching coredumps and backtraces.
613 * Support for prelink will be removed in the next release; this includes
614 removal of the LD_TRACE_PRELINKING, and LD_USE_LOAD_BIAS, environment
615 variables and their functionality in the dynamic loader.
617 * The LD_TRACE_PRELINKING environment variable has been removed. Similar
618 functionality to obtain the program mapping address can be achieved by
619 using LD_TRACE_LOADED_OBJECTS to value of 2.
621 * The LD_USE_LOAD_BIAS has been removed. The variable was mainly used to
622 support prelink PIE binaries.
624 Changes to build and runtime requirements:
626 * The audit module interface version LAV_CURRENT is increased to enable
627 proper bind-now support. The loader now advertises via the la_symbind
628 flags that PLT trace is not possible. New audit modules require the
629 new dynamic loader supporting the latest LAV_CURRENT version. Old audit
630 modules are still loaded for all targets except aarch64.
632 * The audit interface on aarch64 is extended to support both the indirect
633 result location register (x8) and NEON Q register. Old audit modules are
634 rejected by the loader. Audit modules must be rebuilt to use the newer
635 structure sizes and the latest module interface version for LAV_CURRENT.
637 Security related changes:
639 CVE-2022-23219: Passing an overlong file name to the clnt_create
640 legacy function could result in a stack-based buffer overflow when
641 using the "unix" protocol. Reported by Martin Sebor.
643 CVE-2022-23218: Passing an overlong file name to the svcunix_create
644 legacy function could result in a stack-based buffer overflow.
646 CVE-2021-3998: Passing a path longer than PATH_MAX to the realpath
647 function could result in a memory leak and potential access of
648 uninitialized memory. Reported by Qualys.
650 CVE-2021-3999: Passing a buffer of size exactly 1 byte to the getcwd
651 function may result in an off-by-one buffer underflow and overflow
652 when the current working directory is longer than PATH_MAX and also
653 corresponds to the / directory through an unprivileged mount
654 namespace. Reported by Qualys.
656 The following bugs are resolved with this release:
658 [12889] nptl: Race condition in pthread_kill
659 [14232] nptl: tst-cancel7 and tst-cancelx7 race condition
660 [14913] libc: [mips] Clean up MIPS 64-bit register-dump.h output
661 [15310] dynamic-link: _dl_sort_fini is O(n^3) causing slow exit when
663 [15333] libc: Use 64-bit stat functions in installed programs
664 [15533] dynamic-link: LD_AUDIT introduces an avoidable performance
666 [15971] dynamic-link: No interface for debugger access to libraries
668 [17318] locale: [RFE] Provide a C.UTF-8 locale by default
669 [17645] dynamic-link: RFE: Improve performance of dynamic loader for
670 deeply nested DSO dependencies.
671 [19193] nptl: pthread_kill, pthread_cancel return ESRCH for a thread
672 ID whose lifetime has not ended
673 [22542] network: buffer overflow in sunrpc clnt_create
675 [22716] malloc: [PATCH] mtrace.pl: use TRACE_PRELINKING instead of
677 [25947] malloc: memory leak in muntrace
678 [26045] math: fmaxf(inf, nan) does not always work
679 [26108] math: exp10() has problems with <tgmath.h>
680 [26779] build: benign use after realloc at localealias.c:329
681 [27609] dynamic-link: [2.32/2.33/2.34 Regression] In elf/dl-open.c
682 (_dl_open) we might use __LM_ID_CALLER to index GL(dl_ns)[]
683 [27945] build: build-many-glibcs.py doesn't configure GCC with
684 --enable-initfini-array
685 [27991] build: x86: sysdeps/x86/configure.ac breaks when
686 libc_cv_include_x86_isa_level is loaded from cache
687 [28036] nptl: Incorrect types for pthread_mutexattr_set/getrobust_np
688 in __REDIRECT_NTH macro
689 [28061] dynamic-link: A failing dlmopen called by an auditor crashed
690 [28062] dynamic-link: Suppress audit calls when a (new) namespace is
692 [28126] libc: nftw aborts for paths longer than PATH_MAX
693 [28129] dynamic-link: Unnecessary check DT_DEBUG in ld.so
694 [28153] libc: [test] gmon/tst-gmon-gprof* may have a f3 line when
696 [28182] libc: _TIME_BITS=64 in C++ has issues with fcntl, ioctl, prctl
697 [28185] math: Inaccurate j0f function (again)
698 [28199] locale: iconvconfig prefix flag behaves differently in glibc
700 [28203] dynamic-link: aarch64: elf_machine_{load_address,dynamic}
701 should drop _GLOBAL_OFFSET_TABLE_[0] in favor of __ehdr_start for
703 [28213] librt: NULL pointer dereference in mq_notify (CVE-2021-38604)
704 [28223] libc: mips: clone does not align stack
705 [28253] dynamic-link: Missing colon in LD_SHOW_AUXV output after
707 [28256] malloc: Conditional jump or move depends on uninitialised
708 value(s) in __GI___tunables_init
709 [28260] build: io/tst-closefrom, misc/tst-close_range, posix/tst-
710 spawn5 fail if stray fds are open
711 [28310] libc: Do not use affinity mask for sysconf
712 (_SC_NPROCESSORS_CONF)
713 [28338] time: undefined behavior in __tzfile_compute with oddball TZif
715 [28340] dynamic-link: ld.so crashes while loading a DSO with a read-
717 [28349] libc: Segfault for ping -R on qemux86 caused by recvmsg()
718 [28350] libc: ping receives SIGABRT on lib32-qemux86-64 caused by
720 [28353] network: Race condition on __opensock
721 [28357] dynamic-link: deadlock between pthread_create and ctors
722 [28358] math: f64xdivf128 and f64xmulf128 spurious underflows
723 [28361] nptl: Fix for bug 12889 causes setxid deadlock
724 [28368] build: -Waddress instances in stdio-common/vfprintf-internal.c
725 [28390] localedata: Update locale data to Unicode 14.0.0
726 [28397] math: tgmath.h should not define fmaxmag, fminmag macros for
728 [28400] libc: [2.35 Regression] string/test-strncasecmp: cannot set
730 [28407] nptl: pthread_kill assumes that kill (getpid ()) is equivalent
731 to tgkill (getpid (), gettid())
732 [28455] dynamic-link: -Wl,--enable-new-dtags doesn't work
733 [28457] dynamic-link: Missing reldepmod4.so dependency for
735 [28469] time: linux: struct timex is not correctly set for 32-bit
736 systems with TIMESIZE=64
737 [28470] regex: Buffer read overrun in regular expression searching
738 [28475] string: Incorrect access attribute on memfrob
739 [28524] libc: Conversion from ISO-2022-JP-3 with iconv may emit
740 spurious NUL character on state reset
741 [28532] libc: powerpc64[le]: CFI for assembly templated syscalls is
743 [28550] dynamic-link: FAIL: tst-dso-
744 ordering9_112-ecbda(GLIBC_TUNABLES=glibc.rtld.dynamic_sort=1)
746 [28554] build: Undefined generate-md5
747 [28572] libc: Misaligned accesses in test-memcpy and test-mempcpy on
749 [28607] nptl: Masked signals are delivered on thread exit
750 [28624] libc: openjdk 8/9 assume uni processor and gets stuck due to
751 lack of cpu counting /proc fallback with glibc 2.34
752 [28646] string: [2.35 Regression] mock -r fedora-36-x86_64
753 /tmp/java-1.8.0-openjdk-1.8.0.312.b07-2.fc36.src.rpm& fails to build
754 [28648] dynamic-link: Running ld.so on statically linked binaries
756 [28656] dynamic-link: LD_PREFER_MAP_32BIT_EXEC no longer works due to
758 [28676] dynamic-link: p_align on PT_LOAD segment in DSO isn't honored
759 [28678] nptl: nptl/tst-create1 hangs sporadically
760 [28688] dynamic-link: PT_LOAD p_align check is too strict
761 [28700] nss: "dns [!UNAVAIL=return] files" default for hosts database
763 [28707] time: assert in tzfile.c __tzfile_read striking with truncated
764 timezones generated by tzcode-2021d and later
765 [28713] math: GCC 12 miscompiles libm
766 [28732] dynamic-link: FAIL: elf/tst-dl_find_object
767 [28738] build: LIBC_LINKER_FEATURE doesn't work on linker -z option
768 [28745] dynamic-link: _dl_find_object miscompilation on powerpc64le
769 [28746] libc: _FORTIFY_SOURCE does not work for stpcpy
770 [28749] libc: Inconsistency detected by ld.so: rtld.c: 1632: dl_main:
771 Assertion `GL(dl_rtld_map).l_libname' failed!
772 [28755] string: overflow bug in wcsncmp_avx2 and wcsncmp_evex
773 [28757] nptl: GDB printer tests failed with new GDB
774 [28765] math: x86_64 libmvec atan2 accuracy
775 [28766] manual: Document libmvec accuracy
776 [28768] network: Buffer overflow in svcunix_create with long pathnames
778 [28769] libc: Off-by-one buffer overflow/underflow in getcwd()
780 [28770] libc: Unexpected return value from realpath() for too long
781 results (CVE-2021-3998)
782 [28771] libc: %ebx optimization macros are incompatible with .altmacro
784 [28780] build: --disable-default-pie doesn't work on static programs
785 [28782] libc: x86-64 ISA level for glibc itself is always
787 [28792] glob: possible wrong behaviour with patterns with double [
789 [28837] libc: FAIL: socket/tst-socket-timestamp-compat
790 [28847] locale: Empty mon_decimal_point in LC_MONETARY results in non-
791 empty mon_decimal_point_wc
798 * In order to support smoother in-place-upgrades and to simplify
799 the implementation of the runtime all functionality formerly
800 implemented in the libraries libpthread, libdl, libutil, libanl has
801 been integrated into libc. New applications do not need to link with
802 -lpthread, -ldl, -lutil, -lanl anymore. For backwards compatibility,
803 empty static archives libpthread.a, libdl.a, libutil.a, libanl.a are
804 provided, so that the linker options keep working. Applications which
805 have been linked against glibc 2.33 or earlier continue to load the
806 corresponding shared objects (which are now empty). The integration
807 of those libraries into libc means that additional symbols become
808 available by default. This can cause applications that contain weak
809 references to take unexpected code paths that would only have been
810 used in previous glibc versions when e.g. preloading libpthread.so.0,
811 potentially exposing application bugs.
813 * When _DYNAMIC_STACK_SIZE_SOURCE or _GNU_SOURCE are defined,
814 PTHREAD_STACK_MIN is no longer constant and is redefined to
815 sysconf(_SC_THREAD_STACK_MIN). This supports dynamic sized register
816 sets for modern architectural features like Arm SVE.
818 * Add _SC_MINSIGSTKSZ and _SC_SIGSTKSZ. When _DYNAMIC_STACK_SIZE_SOURCE
819 or _GNU_SOURCE are defined, MINSIGSTKSZ and SIGSTKSZ are no longer
820 constant on Linux. MINSIGSTKSZ is redefined to sysconf(_SC_MINSIGSTKSZ)
821 and SIGSTKSZ is redefined to sysconf (_SC_SIGSTKSZ). This supports
822 dynamic sized register sets for modern architectural features like
825 * The dynamic linker implements the --list-diagnostics option, printing
826 a dump of information related to IFUNC resolver operation and
827 glibc-hwcaps subdirectory selection.
829 * On Linux, the function execveat has been added. It operates similar to
830 execve and it is is already used to implement fexecve without requiring
831 /proc to be mounted. However, different than fexecve, if the syscall is not
832 supported by the kernel an error is returned instead of trying a fallback.
834 * The ISO C2X function timespec_getres has been added.
836 * The feature test macro __STDC_WANT_IEC_60559_EXT__, from draft ISO
837 C2X, is supported to enable declarations of functions defined in Annex F
838 of C2X. Those declarations are also enabled when
839 __STDC_WANT_IEC_60559_BFP_EXT__, as specified in TS 18661-1, is
840 defined, and when _GNU_SOURCE is defined.
842 * On powerpc64*, glibc can now be compiled without scv support using the
843 --disable-scv configure option.
845 * Add support for 64-bit time_t on configurations like x86 where time_t
846 is traditionally 32-bit. Although time_t still defaults to 32-bit on
847 these configurations, this default may change in future versions.
848 This is enabled with the _TIME_BITS preprocessor macro set to 64 and is
849 only supported when LFS (_FILE_OFFSET_BITS=64) is also enabled. It is
850 only enabled for Linux and the full support requires a minimum kernel
853 * The main gconv-modules file in glibc now contains only a small set of
854 essential converter modules and the rest have been moved into a supplementary
855 configuration file gconv-modules-extra.conf in the gconv-modules.d directory
856 in the same GCONV_PATH. Similarly, external converter modules directories
857 may have supplementary configuration files in a gconv-modules.d directory
858 with names ending with .conf to logically classify the converter modules in
861 * On Linux, a new tunable, glibc.pthread.stack_cache_size, can be used
862 to configure the size of the thread stack cache.
864 * The function _Fork has been added as an async-signal-safe fork replacement
865 since Austin Group issue 62 dropped the async-signal-safe requirement for
866 fork (and it will be included in the future POSIX standard). The new _Fork
867 function does not run any atfork function neither resets any internal state
868 or lock (such as the malloc one), and only sets up a minimal state required
869 to call async-signal-safe functions (such as raise or execve). This function
870 is currently a GNU extension.
872 * On Linux, the close_range function has been added. It allows efficiently
873 closing a range of file descriptors on recent kernels (version 5.9).
875 * The function closefrom has been added. It closes all file descriptors
876 greater than or equal to a given integer. This function is a GNU extension,
877 although it is also present in other systems.
879 * The posix_spawn_file_actions_addclosefrom_np function has been added,
880 enabling posix_spawn and posix_spawnp to close all file descriptors greater
881 than or equal to a given integer. This function is a GNU extension,
882 although Solaris also provides a similar function.
884 * When invoked explicitly, the dynamic linker now uses the kernel to
885 execute programs that do not have any dynamic dependency (that is,
886 they are statically linked). This feature is Linux-specific.
888 Deprecated and removed features, and other changes affecting compatibility:
890 * The function pthread_mutex_consistent_np has been deprecated; programs
891 should use the equivalent standard function pthread_mutex_consistent
894 * The function pthread_mutexattr_getrobust_np has been deprecated;
895 programs should use the equivalent standard function
896 pthread_mutexattr_getrobust instead.
898 * The function pthread_mutexattr_setrobust_np has been deprecated;
899 programs should use the equivalent standard function
900 pthread_mutexattr_setrobust instead.
902 * The function pthread_yield has been deprecated; programs should use
903 the equivalent standard function sched_yield instead.
905 * The function inet_neta declared in <arpa/inet.h> has been deprecated.
907 * Various rarely-used functions declared in <resolv.h> and
908 <arpa/nameser.h> have been deprecated. Applications are encouraged to
909 use dedicated DNS processing libraries if applicable. For <resolv.h>,
910 this affects the functions dn_count_labels, fp_nquery, fp_query,
911 fp_resstat, hostalias, loc_aton, loc_ntoa, p_cdname, p_cdnname,
912 p_class, p_fqname, p_fqnname, p_option, p_query, p_rcode, p_time,
913 p_type, putlong, putshort, res_hostalias, res_isourserver,
914 res_nameinquery, res_queriesmatch, res_randomid, sym_ntop, sym_ntos,
915 sym_ston. For <arpa/nameser.h>, the functions ns_datetosecs,
916 ns_format_ttl, ns_makecanon, ns_parse_ttl, ns_samedomain, ns_samename,
917 ns_sprintrr, ns_sprintrrf, ns_subdomain have been deprecated.
919 * Various symbols previously defined in libresolv have been moved to libc
920 in order to prepare for libresolv moving entirely into libc (see earlier
921 entry for merging libraries into libc). The symbols __dn_comp,
922 __dn_expand, __dn_skipname, __res_dnok, __res_hnok, __res_mailok,
923 __res_mkquery, __res_nmkquery, __res_nquery, __res_nquerydomain,
924 __res_nsearch, __res_nsend, __res_ownok, __res_query, __res_querydomain,
925 __res_search, __res_send formerly in libresolv have been renamed and no
926 longer have a __ prefix. They are now available in libc.
928 * The pthread cancellation handler is now installed with SA_RESTART and
929 pthread_cancel will always send the internal SIGCANCEL on a cancellation
930 request. It should not be visible to applications since the cancellation
931 handler should either act upon cancellation (if asynchronous cancellation
932 is enabled) or ignore the cancellation internal signal. However there are
933 buggy kernel interfaces (for instance some CIFS versions) that could still
934 see a spurious EINTR error when cancellation interrupts a blocking syscall.
936 * Previously, glibc installed its various shared objects under versioned
937 file names such as libc-2.33.so. The ABI sonames (e.g., libc.so.6)
938 were provided as symbolic links. Starting with glibc 2.34, the shared
939 objects are installed under their ABI sonames directly, without
940 symbolic links. This increases compatibility with distribution
941 package managers that delete removed files late during the package
942 upgrade or downgrade process.
944 * The symbols mallwatch and tr_break are now deprecated and no longer used in
945 mtrace. Similar functionality can be achieved by using conditional
946 breakpoints within mtrace functions from within gdb.
948 * The __morecore and __after_morecore_hook malloc hooks and the default
949 implementation __default_morecore have been removed from the API. Existing
950 applications will continue to link against these symbols but the interfaces
951 no longer have any effect on malloc.
953 * Debugging features in malloc such as the MALLOC_CHECK_ environment variable
954 (or the glibc.malloc.check tunable), mtrace() and mcheck() have now been
955 disabled by default in the main C library. Users looking to use these
956 features now need to preload a new debugging DSO libc_malloc_debug.so to get
957 this functionality back.
959 * The deprecated functions malloc_get_state and malloc_set_state have been
960 moved from the core C library into libc_malloc_debug.so. Legacy applications
961 that still use these functions will now need to preload libc_malloc_debug.so
962 in their environment using the LD_PRELOAD environment variable.
964 * The deprecated memory allocation hooks __malloc_hook, __realloc_hook,
965 __memalign_hook and __free_hook are now removed from the API. Compatibility
966 symbols are present to support legacy programs but new applications can no
967 longer link to these symbols. These hooks no longer have any effect on glibc
968 functionality. The malloc debugging DSO libc_malloc_debug.so currently
969 supports hooks and can be preloaded to get this functionality back for older
970 programs. However this is a transitional measure and may be removed in a
971 future release of the GNU C Library. Users may port away from these hooks by
972 writing and preloading their own malloc interposition library.
974 Changes to build and runtime requirements:
976 * On Linux, the shm_open, sem_open, and related functions now expect the
977 file shared memory file system to be mounted at /dev/shm. These functions
978 no longer search among the system's mount points for a suitable
979 replacement if /dev/shm is not available.
981 Security related changes:
983 CVE-2021-27645: The nameserver caching daemon (nscd), when processing
984 a request for netgroup lookup, may crash due to a double-free,
985 potentially resulting in degraded service or Denial of Service on the
986 local system. Reported by Chris Schanzle.
988 CVE-2021-33574: The mq_notify function has a potential use-after-free
989 issue when using a notification type of SIGEV_THREAD and a thread
990 attribute with a non-default affinity mask.
992 CVE-2021-35942: The wordexp function may overflow the positional
993 parameter number when processing the expansion resulting in a crash.
994 Reported by Philippe Antoine.
996 The following bugs are resolved with this release:
998 [4737] libc: fork is not async-signal-safe
999 [5781] math: Slow dbl-64 sin/cos/sincos for special values
1000 [10353] libc: Methods for deleting all file descriptors greater than
1001 given integer (closefrom)
1002 [14185] glob: fnmatch() fails when '*' wildcard is applied on the file
1003 name containing multi-byte character(s)
1004 [14469] math: Inaccurate j0f function
1005 [14470] math: Inaccurate j1f function
1006 [14471] math: Inaccurate y0f function
1007 [14472] math: Inaccurate y1f function
1008 [14744] nptl: kill -32 $pid or kill -33 $pid on a process cancels a
1010 [15271] dynamic-link: dlmopen()ed shared library with LM_ID_NEWLM
1011 crashes if it fails dlsym() twice
1012 [15648] nptl: multiple definition of `__lll_lock_wait_private'
1013 [16063] nptl: Provide a pthread_once variant in libc directly
1014 [17144] libc: syslog is not thread-safe if NO_SIGPIPE is not defined
1015 [17145] libc: syslog with LOG_CONS leaks console file descriptor
1016 [17183] manual: description of ENTRY struct in <search.h> in glibc
1018 [18435] nptl: pthread_once hangs when init routine throws an exception
1019 [18524] nptl: Missing calloc error checking in
1020 __cxa_thread_atexit_impl
1021 [19329] dynamic-link: dl-tls.c assert failure at concurrent
1022 pthread_create and dlopen
1023 [19366] nptl: returning from a thread should disable cancellation
1024 [19511] nptl: 8MB memory leak in pthread_create in case of failure
1025 when non-root user changes priority
1026 [20802] dynamic-link: getauxval NULL pointer dereference after static
1028 [20813] nptl: pthread_exit is inconsistent between libc and libpthread
1029 [22057] malloc: malloc_usable_size is broken with mcheck
1030 [22668] locale: LC_COLLATE: the last character of ellipsis is not
1032 [23323] libc: [RFE] CSU startup hardening.
1033 [23328] malloc: Remove malloc hooks and ensure related APIs return no
1035 [23462] dynamic-link: Static binary with dynamic string tokens ($LIB,
1036 $PLATFORM, $ORIGIN) crashes
1037 [23489] libc: "gcc -lmcheck" aborts on free when using posix_memalign
1038 [23554] nptl: pthread_getattr_np reports wrong stack size with
1040 [24106] libc: Bash interpreter in ldd script is taken from host
1041 [24773] dynamic-link: dlerror in an secondary namespace does not use
1042 the right free implementation
1043 [25036] localedata: Update collation order for Swedish
1044 [25383] libc: where_is_shmfs/__shm_directory/SHM_GET_NAME may cause
1045 shm_open to pick wrong directory
1046 [25680] dynamic-link: ifuncmain9picstatic and ifuncmain9picstatic
1047 crash in IFUNC resolver due to stack canary (--enable-stack-
1049 [26874] build: -Warray-bounds in _IO_wdefault_doallocate
1050 [26983] math: [x86_64] x86_64 tgamma has too large ULP error
1051 [27111] dynamic-link: pthread_create and tls access use link_map
1052 objects that may be concurrently freed by dlclose
1053 [27132] malloc: memusagestat is linked to system librt, leading to
1054 undefined symbols on major version upgrade
1055 [27136] dynamic-link: dtv setup at thread creation may leave an entry
1057 [27249] libc: libSegFault.so does not output signal number properly
1058 [27304] nptl: pthread_cond_destroy does not pass private flag to futex
1060 [27318] dynamic-link: glibc fails to load binaries when built with
1061 -march=sandybridge: CPU ISA level is lower than required
1062 [27343] nss: initgroups() SIGSEGVs when called on a system without
1063 nsswich.conf (in a chroot)
1064 [27346] dynamic-link: x86: PTWRITE feature check is missing
1065 [27389] network: NSS chroot hardening causes regressions in chroot
1067 [27403] dynamic-link: aarch64: tlsdesc htab is not freed on dlclose
1068 [27444] libc: sysconf reports unsupported option (-1) for
1069 _SC_LEVEL1_ICACHE_LINESIZE on X86 since v2.33
1070 [27462] nscd: double-free in nscd (CVE-2021-27645)
1071 [27468] malloc: aarch64: realloc crash with heap tagging: FAIL:
1072 malloc/tst-malloc-thread-fail
1073 [27498] dynamic-link: __dl_iterate_phdr lacks unwinding information
1074 [27511] libc: S390 memmove assumes Vector Facility when MIE Facility 3
1076 [27522] glob: glob, glob64 incorrectly marked as __THROW
1077 [27555] dynamic-link: Static tests fail with --enable-stack-
1079 [27559] libc: fstat(AT_FDCWD) succeeds (it shouldn't) and returns
1080 information for the current directory
1081 [27577] dynamic-link: elf/ld.so --help doesn't work
1082 [27605] libc: tunables can't control xsave/xsavec selection in
1083 dl_runtime_resolve_*
1084 [27623] libc: powerpc: Missing registers in sc[v] clobbers list
1085 [27645] libc: [linux] sysconf(_SC_NPROCESSOR...) breaks down on
1087 [27646] dynamic-link: Linker error for non-existing NSS symbols (e.g.
1088 _nss_files_getcanonname_r) from within a dlmopen namespace.
1089 [27648] libc: FAIL: misc/tst-select
1090 [27650] stdio: vfscanf returns too early if a match is longer than
1092 [27651] libc: Performance regression after updating to 2.33
1093 [27655] string: Wrong size calculation in string/test-strnlen.c
1094 [27706] libc: select fails to update timeout on error
1095 [27709] libc: arm: FAIL: debug/tst-longjmp_chk2
1096 [27721] dynamic-link: x86: ld_audit ignores bind now for TLSDESC and
1097 tries resolving them lazily
1098 [27744] nptl: Support different libpthread/ld.so load orders in
1100 [27749] libc: Data race __run_exit_handlers
1101 [27761] libc: getconf: Segmentation fault when passing '-vq' as
1103 [27832] nss: makedb.c:797:7: error: 'writev' specified size 4294967295
1104 exceeds maximum object size 2147483647
1105 [27870] malloc: MALLOC_CHECK_ causes realloc(valid_ptr, TOO_LARGE) to
1107 [27872] build: Obsolete configure option --enable-stackguard-
1109 [27873] build: tst-cpu-features-cpuinfo fail when building on AMD cpu
1110 [27882] localedata: Use U+00AF MACRON in more EBCDIC charsets
1111 [27892] libc: powerpc: scv ABI error handling fails to check
1113 [27896] nptl: mq_notify does not handle separately allocated thread
1114 attributes (CVE-2021-33574)
1115 [27901] libc: TEST_STACK_ALIGN doesn't work
1116 [27902] libc: The x86-64 clone wrapper fails to align child stack
1117 [27914] nptl: Install SIGSETXID handler with SA_ONSTACK
1118 [27939] libc: aarch64: clone does not align the stack
1119 [27968] libc: s390x: clone does not align the stack
1120 [28011] libc: Wild read in wordexp (parse_param) (CVE-2021-35942)
1121 [28024] string: s390(31bit): Wrong result of memchr (MEMCHR_Z900_G5)
1122 with n >= 0x80000000
1123 [28028] malloc: malloc: tcache shutdown sequence does not work if the
1124 thread never allocated anything
1125 [28033] libc: Need to check RTM_ALWAYS_ABORT for RTM
1126 [28064] string: x86_64:wcslen implementation list has wcsnlen
1127 [28067] libc: FAIL: posix/tst-spawn5
1128 [28068] malloc: FAIL: malloc/tst-mallocalign1-mcheck
1129 [28071] time: clock_gettime, gettimeofday, time lost vDSO acceleration
1131 [28075] nis: Out-of-bounds static buffer read in nis_local_domain
1132 [28089] build: tst-tls20 fails when linker defaults to --as-needed
1133 [28090] build: elf/tst-cpu-features-cpuinfo-static fails on certain
1135 [28091] network: ns_name_skip may return 0 for domain names without
1143 * The dynamic linker accepts the --list-tunables argument which prints
1144 all the supported tunables. This option is disable if glibc is
1145 configured with tunables disabled (--enable-tunables=no).
1147 * The dynamic linker accepts the --argv0 argument and provides opportunity
1148 to change argv[0] string.
1150 * The dynamic linker loads optimized implementations of shared objects
1151 from subdirectories under the glibc-hwcaps directory on the library
1152 search path if the system's capabilities meet the requirements for
1153 that subdirectory. Initially supported subdirectories include
1154 "power9" and "power10" for the powerpc64le-linux-gnu architecture,
1155 "z13", "z14", "z15" for s390x-linux-gnu, and "x86-64-v2", "x86-64-v3",
1156 "x86-64-v4" for x86_64-linux-gnu. In the x86_64-linux-gnu case, the
1157 subdirectory names correspond to the vendor-independent x86-64
1158 microarchitecture levels defined in the x86-64 psABI supplement.
1160 * The new --help option of the dynamic linker provides usage and
1161 information and library search path diagnostics.
1163 * The mallinfo2 function is added to report statistics as per mallinfo,
1164 but with larger field widths to accurately report values that are
1165 larger than fit in an integer.
1167 * Add <sys/platform/x86.h> to provide query macros for x86 CPU features.
1169 * Support for the RISC-V ISA running on Linux has been expanded to run on
1170 32-bit hardware. This is supported for the following ISA and ABI pairs:
1176 The 32-bit RISC-V port requires at least Linux 5.4, GCC 7.1 and binutils
1179 * A new fortification level _FORTIFY_SOURCE=3 is available. At this level,
1180 glibc may use additional checks that may have an additional performance
1181 overhead. At present these checks are available only on LLVM 9 and later.
1182 The latest GCC available at this time (10.2) does not support this level of
1185 Deprecated and removed features, and other changes affecting compatibility:
1187 * The mallinfo function is marked deprecated. Callers should call
1190 * When dlopen is used in statically linked programs, alternative library
1191 implementations from HWCAP subdirectories are no longer loaded.
1192 Instead, the default implementation is used.
1194 * The deprecated <sys/vtimes.h> header and the function vtimes have been
1195 removed. To support old binaries, the vtimes function continues to exist
1196 as a compatibility symbol. Applications should use the getrlimit or
1199 * Following a change in the tzdata 2018a release upstream, the zdump
1200 program is now installed in the /usr/bin subdirectory. Previously,
1201 the /usr/sbin subdirectory was used.
1203 * On s390(x), the type float_t is now derived from the macro
1204 __FLT_EVAL_METHOD__ that is defined by the compiler, instead of being
1205 hardcoded to double. This does not affect the ABI of any libraries
1206 that are part of the GNU C Library, but may affect the ABI of other
1207 libraries that use this type in their interfaces. The new definition
1208 improves consistency with compiler behavior in many scenarios.
1210 * A future version of glibc will stop loading shared objects from the
1211 "tls" subdirectories on the library search path, the subdirectory that
1212 corresponds to the AT_PLATFORM system name, and also stop employing
1213 the legacy AT_HWCAP search mechanism. Applications should switch to
1214 the new glibc-hwcaps mechanism instead; if they do not do that, only
1215 the baseline version (directly from the search path directory) will be
1218 Changes to build and runtime requirements:
1220 * On Linux, the system administrator needs to configure /dev/pts with
1221 the intended access modes for pseudo-terminals. glibc no longer
1222 attempts to adjust permissions of terminal devices. The previous glibc
1223 defaults ("tty" group, user read/write and group write) already
1224 corresponded to what most systems used, so that grantpt did not
1225 perform any adjustments.
1227 * On Linux, the posix_openpt and getpt functions no longer attempt to
1228 use legacy (BSD) pseudo-terminals and assume that if /dev/ptmx exists
1229 (and pseudo-terminals are supported), a devpts file system is mounted
1230 on /dev/pts. Current systems already meet these requirements.
1232 * s390x requires GCC 7.1 or newer. See gcc Bug 98269.
1234 Security related changes:
1236 CVE-2021-3326: An assertion failure during conversion from the
1237 ISO-20220-JP-3 character set using the iconv function has been fixed.
1238 This assertion was triggered by certain valid inputs in which the
1239 converted output contains a combined sequence of two wide characters
1240 crossing a buffer boundary. Reported by Tavis Ormandy.
1242 CVE-2020-27618: An infinite loop has been fixed in the iconv program when
1243 invoked with input containing redundant shift sequences in the IBM1364,
1244 IBM1371, IBM1388, IBM1390, or IBM1399 character sets.
1246 CVE-2020-29562: An assertion failure has been fixed in the iconv function
1247 when invoked with UCS4 input containing an invalid character.
1249 CVE-2019-25013: A buffer overflow has been fixed in the iconv function when
1250 invoked with EUC-KR input containing invalid multibyte input sequences.
1252 The following bugs are resolved with this release:
1254 [10635] libc: realpath portability patches
1255 [16124] dynamic-link: ld.so should allow to change argv[0]
1256 [17924] malloc: 'free' should not set errno
1257 [18683] libc: Linux faccessat implementation can incorrectly ignore
1259 [22899] libc: Use 64-bit readdir() in generic POSIX getcwd()
1260 [23091] hurd: missing waitid support
1261 [23249] libc: Epyc and other current AMD CPUs do not select the
1262 "haswell" platform subdirectory
1263 [24080] dynamic-link: Definition of "haswell" platform is inconsistent
1265 [24202] libc: m68k setjmp() saves incorrect 'a5' register in --enable-
1267 [24941] libc: Make grantpt usable after multi-threaded fork in more
1269 [24970] libc: realpath mishandles EOVERFLOW; stat not needed anyway
1270 [24973] locale: iconv encounters segmentation fault when converting
1271 0x00 0xfe in EUC-KR to UTF-8 (CVE-2019-25013)
1272 [25399] string: undefined reference to `__warn_memset_zero_len' when
1273 changing gnuc version
1274 [25859] libc: glibc parser for /sys/devices/system/cpu/online is
1276 [25938] dynamic-link: ld.so.cache should store meaning of hwcap mask
1278 [25971] libc: s390 bits/hwcap.h out of sync with kernel
1279 [26053] libc: unlockpt fails with ENOTTY for non-ptmx descriptors
1280 [26100] libc: Race in syslog(3) with regards to tag printing.
1281 [26124] libc: Export <cpu-features.h>
1282 [26130] nscd: Inconsistent nscd cache during pruning
1283 [26203] libc: GLRO(dl_x86_cpu_features) may not be initialized
1284 [26224] locale: iconv hangs when converting some invalid inputs from
1285 several IBM character sets (CVE-2020-27618)
1286 [26341] libc: realpath cyclically call __alloca(path_max) to consume
1287 too much stack space
1288 [26343] manual: invalid documented return type for strerrorname_np(),
1289 strerrordesc_np(), sigdescr_np(), sigabbrev_np()
1290 [26376] libc: Namespace violation in stdio.h and sys/stat.h if build
1292 [26383] locale: bind_textdomain_codeset doesn't accept //TRANSLIT
1294 [26394] time: [2.33 Regression] FAIL: nptl/tst-join14
1295 [26534] math: libm.so 2.32 SIGILL in pow() due to FMA4 instruction on
1297 [26552] dynamic-link: CPU_FEATURE_USABLE_P should be more conservative
1298 [26553] libc: mtx_init allows type set to "mtx_recursive" only
1299 [26555] string: strerrorname_np does not return the documented value
1300 [26592] libc: pointer arithmetic overflows in realpath
1301 [26600] network: Transaction ID collisions cause slow DNS lookups in
1303 [26606] libc: [2.33 Regression] pselect is broken on x32
1304 [26615] libc: powerpc: libc segfaults when LD_PRELOADed with libgcc
1305 [26620] glob: fnmatch with collating symbols results in segmentation
1307 [26625] libc: [2.33 Regression] CET is disabled
1308 [26636] libc: 32-bit shmctl(IPC_INFO) crashes when shminfo struct is
1309 at the end of a memory mapping
1310 [26637] libc: semctl SEM_STAT_ANY fails to pass the buffer specified
1311 by the caller to the kernel
1312 [26639] libc: msgctl IPC_INFO and MSG_INFO return garbage
1313 [26647] build: [-Werror=array-parameter=] due to different
1314 declarations for __sigsetjmp
1315 [26648] libc: mkstemp is likely to fail on systems with non-stricly-
1317 [26649] stdio: printf should handle non-normal x86 long double numbers
1318 gracefully (CVE-2020-29573)
1319 [26686] build: -Warray-parameter instances building with GCC 11
1320 [26687] build: -Warray-bounds instances building with GCC 11
1321 [26690] stdio: Aliasing violation in __vfscanf_internal
1322 [26691] nptl: Use a minimum guard size of 64 KiB on aarch64
1323 [26726] build: GCC warning calling new_composite_name with an array of
1325 [26736] libc: FAIL: misc/tst-sysvshm-linux
1326 [26737] libc: Random FAIL: rt/tst-shm
1327 [26791] libc: Missing O_CLOEXEC in sysconf.c
1328 [26798] dynamic-link: aarch64: variant PCS symbols may be incorrectly
1330 [26801] nptl: pthread_mutex_clocklock with CLOCK_MONOTONIC can fail on
1332 [26818] string: aarch64: string tests may run ifunc variants that are
1334 [26821] libc: Memory leak test failures on Fedora 33
1335 [26824] libc: FAIL: elf/tst-cpu-features-supports with recent trunk:
1336 FSGSBASE/LM/RDRAND check failure
1337 [26833] time: adjtime() with delta == NULL segfaults on armv7 32bit
1339 [26853] libc: aarch64: Missing unwind information in statically linked
1341 [26923] locale: Assertion failure in iconv when converting invalid
1342 UCS4 (CVE-2020-29562)
1343 [26926] dynamic-link: aarch64: library dependencies are not bti
1345 [26932] libc: sh: Multiple floating point functions defined as stubs
1347 [26964] nptl: pthread_mutex_timedlock returning EAGAIN after futex is
1349 [26988] dynamic-link: aarch64: BTI mprotect address is not page
1351 [27002] build: libc_freeres_fn build failure with GCC 11
1352 [27004] dynamic-link: ld.so is miscompiled by GCC 11
1353 [27008] dynamic-link: ld.so.cache should have endianness markup
1354 [27042] libc: [alpha] anonymous union in struct stat confuses
1356 [27053] libc: Conformance regression in system(3) (and probably also
1358 [27072] dynamic-link: static pie ifunc resolvers run before hwcap is
1360 [27077] network: Do not reload /etc/nsswitch.conf from chroot
1361 [27083] libc: Unsafe unbounded alloca in addmntent
1362 [27104] dynamic-link: The COMMON_CPUID_INDEX_MAX handshake does not
1364 [27130] string: "rep movsb" performance issue
1365 [27150] libc: alpha: wait4() is unavailable in static linking
1366 [27177] dynamic-link:
1367 GLIBC_TUNABLES=glibc.cpu.x86_ibt=on:glibc.cpu.x86_shstk=on doesn't
1369 [27222] dynamic-link: Incorrect sysdeps/x86/tst-cpu-features-cpuinfo.c
1370 [27237] malloc: deadlock in malloc/tst-malloc-stats-cancellation
1371 [27256] locale: Assertion failure in ISO-2022-JP-3 gconv module
1372 related to combining characters (CVE-2021-3326)
1379 * Unicode 13.0.0 Support: Character encoding, character type info, and
1380 transliteration tables are all updated to Unicode 13.0.0, using
1381 generator scripts contributed by Mike FABIAN (Red Hat).
1383 * New locale added: ckb_IQ (Kurdish/Sorani spoken in Iraq)
1385 * Support for Synopsys ARC HS cores (ARCv2 ISA) running Linux has been
1386 added. This port requires at least binutils-2.32, gcc-8.3 and Linux-5.1.
1387 Three ABIs are supported:
1393 The arc* ABIs are little-endian while arceb is big-endian. All ABIs use
1394 64-bit time (y2038 safe) and 64-bit file offsets (LFS default).
1396 * The GNU C Library now loads audit modules listed in the DT_AUDIT and
1397 DT_DEPAUDIT dynamic section entries of the main executable.
1399 * powerpc64le supports IEEE128 long double libm/libc redirects when
1400 using -mabi=ieeelongdouble to compile C code on supported GCC
1401 toolchains. It is recommended to use GCC 8 or newer when testing
1404 * To help detect buffer overflows and other out-of-bounds accesses
1405 several APIs have been annotated with GCC 'access' attribute. This
1406 should help GCC 10 issue better warnings.
1408 * On Linux, functions pthread_attr_setsigmask_np and
1409 pthread_attr_getsigmask_np have been added. They allow applications
1410 to specify the signal mask of a thread created with pthread_create.
1412 * The GNU C Library now provides the header file <sys/single_threaded.h>
1413 which declares the variable __libc_single_threaded. Applications are
1414 encouraged to use this variable for single-thread optimizations,
1415 instead of weak references to symbols historically defined in
1418 * The functions sigabbrev_np and sigdescr_np have been added. The
1419 sigabbrev_np function returns the abbreviated signal name (e.g. "HUP" for
1420 SIGHUP) while sigdescr_np returns a string describing the signal number
1421 (e.g "Hangup" for SIGHUP). Different than strsignal, sigdescr_np does not
1422 attempt to translate the return description, both functions return
1423 NULL for an invalid signal number.
1425 They should be used instead of sys_siglist or sys_sigabbrev and they
1426 are both thread and async-signal safe. These functions are GNU extensions.
1428 * The functions strerrorname_np and strerrordesc_np have been added. The
1429 strerroname_np function returns error number name (e.g. "EINVAL" for EINVAL)
1430 while strerrordesc_np returns a string describing the error number
1431 (e.g "Invalid argument" for EINVAL). Different than strerror,
1432 strerrordesc_np does not attempt to translate the return description, both
1433 functions return NULL for an invalid error number.
1435 They should be used instead of sys_errlist and sys_nerr, both are
1436 thread and async-signal safe. These functions are GNU extensions.
1438 * AArch64 now supports standard branch protection security hardening
1439 in glibc when it is built with a GCC that is configured with
1440 --enable-standard-branch-protection (or if -mbranch-protection=standard
1441 flag is passed when building both GCC target libraries and glibc,
1442 in either case a custom GCC is needed). This includes branch target
1443 identification (BTI) and pointer authentication for return addresses
1444 (PAC-RET). They require armv8.5-a and armv8.3-a architecture
1445 extensions respectively for the protection to be effective,
1446 otherwise the used instructions are nops. User code can use PAC-RET
1447 without libc support, but BTI requires a libc that is built with BTI
1448 support, otherwise runtime objects linked into user code will not be
1451 Deprecated and removed features, and other changes affecting compatibility:
1453 * Remove configure option --enable-obsolete-rpc. Sun RPC is removed
1454 from glibc. This includes the rpcgen program, librpcsvc, and the Sun
1455 RPC header files. Backward compatibility for old programs is kept
1456 only for architectures and ABIs that have been added in or before
1457 glibc 2.31. New programs need to use TI-RPC
1458 <http://git.linux-nfs.org/?p=steved/libtirpc.git;a=summary> and
1459 rpcsvc-proto <https://github.com/thkukuk/rpcsvc-proto>.
1461 * Remove configure option --enable-obsolete-nsl. libnsl is only built
1462 as shared library for backward compatibility and the NSS modules "nis"
1463 and "nisplus" are not built at all and libnsl's headers aren't
1464 installed. This compatibility is kept only for architectures and ABIs
1465 that have been added in or before version 2.28. Replacement
1466 implementations based on TI-RPC, which additionally support IPv6, are
1467 available from <https://github.com/thkukuk/>. This change does not
1468 affect the "compat" NSS module, which does not depend on libnsl
1469 since 2.27 and thus can be used without NIS.
1471 * The deprecated <sys/sysctl.h> header and the sysctl function have been
1472 removed. To support old binaries, the sysctl function continues to
1473 exist as a compatibility symbol (on those architectures which had it),
1474 but always fails with ENOSYS. This reflects the removal of the system
1475 call from all architectures, starting with Linux 5.5.
1477 * The sstk function is no longer available to newly linked binaries.
1478 Its implementation always returned with a failure, and the function
1479 was not declared in any header file.
1481 * The legacy signal handling functions siginterrupt, sigpause, sighold,
1482 sigrelse, sigignore and sigset, and the sigmask macro have been
1483 deprecated. Applications should use the sigsuspend, sigprocmask and
1484 sigaction functions instead.
1486 * ldconfig now defaults to the new format for ld.so.cache. glibc has
1487 already supported this format for almost 20 years.
1489 * The deprecated arrays sys_siglist, _sys_siglist, and sys_sigabbrev
1490 are no longer available to newly linked binaries, and their declarations
1491 have been removed from <string.h>. They are exported solely as
1492 compatibility symbols to support old binaries. All programs should use
1495 * The deprecated symbols sys_errlist, _sys_errlist, sys_nerr, and _sys_nerr
1496 are no longer available to newly linked binaries, and their declarations
1497 have been removed from <stdio.h>. They are exported solely as
1498 compatibility symbols to support old binaries. All programs should use
1499 strerror or strerror_r instead.
1501 * Both strerror and strerror_l now share the same internal buffer in the
1502 calling thread, meaning that the returned string pointer may be invalided
1503 or contents might be overwritten on subsequent calls in the same thread or
1504 if the thread is terminated. It makes strerror MT-safe.
1506 * Using weak references to libpthread functions such as pthread_create
1507 or pthread_key_create to detect the singled-threaded nature of a
1508 program is an obsolescent feature. Future versions of glibc will
1509 define pthread_create within libc.so.6 itself, so such checks will
1510 always flag the program as multi-threaded. Applications should check
1511 the __libc_single_threaded variable declared in
1512 <sys/single_threaded.h> instead.
1514 * The "files" NSS module no longer supports the "key" database (used for
1515 secure RPC). The contents of the /etc/publickey file will be ignored,
1516 regardless of the settings in /etc/nsswitch.conf. (This method of
1517 storing RPC keys only supported the obsolete and insecure AUTH_DES
1518 flavor of secure RPC.)
1520 * The __morecore and __after_morecore_hook malloc hooks and the default
1521 implementation __default_morecore have been deprecated. Applications
1522 should use malloc interposition to change malloc behavior, and mmap to
1523 allocate anonymous memory. A future version of glibc may require that
1524 applications which use the malloc hooks must preload a special shared
1525 object, to enable the hooks.
1527 * The hesiod NSS module has been deprecated and will be removed in a
1528 future version of glibc. System administrators are encouraged to
1529 switch to other approaches for networked account databases, such as
1532 Changes to build and runtime requirements:
1534 * powerpc64le requires GCC 7.4 or newer. This is required for supporting
1535 long double redirects.
1537 Security related changes:
1539 CVE-2016-10228: An infinite loop has been fixed in the iconv program when
1540 invoked with the -c option and when processing invalid multi-byte input
1541 sequences. Reported by Jan Engelhardt.
1543 CVE-2020-10029: Trigonometric functions on x86 targets suffered from stack
1544 corruption when they were passed a pseudo-zero argument. Reported by Guido
1545 Vranken / ForAllSecure Mayhem.
1547 CVE-2020-1752: A use-after-free vulnerability in the glob function when
1548 expanding ~user has been fixed.
1550 CVE-2020-6096: A signed comparison vulnerability in the ARMv7 memcpy and
1551 memmove functions has been fixed. Discovered by Jason Royes and Samual
1552 Dytrych of the Cisco Security Assessment and Penetration Team (See
1555 The following bugs are resolved with this release:
1557 [9809] localedata: ckb_IQ: new Kurdish Sorani locale
1558 [10441] manual: Backtraces code example lacks error checking
1559 [10815] librt: [timer_create / SIGEV_THREAD] signalmask of
1560 timer_sigev_thread dangerous
1561 [14231] stdio: stdio-common tests memory requirements
1562 [14578] libc: /proc-based emulation for lchmod, fchmodat
1563 [16272] dynamic-link: dlopen()ing a DT_FILTER library crashes if
1564 filtee has constructor
1565 [19519] locale: iconv(1) with -c option hangs on illegal multi-byte
1566 sequences (CVE-2016-10228)
1567 [19737] admin: Doc page “20.5.2 Infinity and NaN” has incorrect HTML
1568 character entities for infinity & pi
1569 [20338] libc: Parsing of /etc/gshadow can return bad pointers causing
1570 segfaults in applications
1571 [20543] libc: Please move from .gnu.linkonce to comdat
1572 [22489] network: gcc warns about implicit conversion in
1573 ICMP6_FILTER_SETPASS with -Wsign-conversion
1574 [22525] localedata: or_IN LC_COLLATE does not use copy "iso14651_t1"
1575 [23294] math: Complex _FloatN functions are redirected to the wrong
1576 function with -mlong-double-64
1577 [23296] libc: Data race in setting function descriptor during lazy
1579 [23668] dynamic-link: ldconfig: Default to the new format for
1581 [23819] hurd: hurd: Add C11 thread support
1582 [23990] build: test-container error out on failure to exec child.
1583 [23991] build: shell-container typo in run_command_array
1584 [24638] manual: Error in example of parsing a template string
1585 [24654] manual: Wrong declaration of wcschr in libc manual
1586 [24943] dynamic-link: Support DT_AUDIT, DT_DEPAUDIT in the dynamic
1588 [25051] dynamic-link: aarch64, powerpc64 uses surplus static tls for
1589 dynamically loaded dsos
1590 [25098] nptl: nptl: ctype classification functions are not AS-Safe
1591 [25219] libc: improve out-of-bounds checking with GCC 10 attribute
1593 [25262] libc: getcontext/setcontext/swapcontext unnecessarily save and
1594 restore EAX, ECX and EDX
1595 [25397] dynamic-link: Legacy bitmap doesn't cover jitted code
1596 [25414] glob: 'glob' use-after-free bug (CVE-2020-1752)
1597 [25420] network: Race condition in resolv_conf.c can result in caching
1598 stale configuration forever
1599 [25487] math: sinl() stack corruption from crafted input
1601 [25506] build: configure: broken detection of STT_GNU_IFUNC when GCC
1603 [25523] libc: MIPS/Linux inline syscall template is miscompiled
1604 [25620] libc: Signed comparison vulnerability in the ARMv7 memcpy()
1606 [25623] libc: test-sysvmsg, test-sysvsem, test-sysvshm fail with 2.31
1607 on 32 bit and old kernel
1608 [25635] libc: arm: Wrong sysdep order selection for soft-fp
1609 [25639] localedata: Some names of days and months wrongly spelt in
1611 [25657] libc: sigprocmask() and sigisemptyset() manipulate different
1612 amount of sigset_t bytes
1613 [25691] stdio: printf: memory leak when printing long multibyte
1615 [25715] libc: system() returns wrong errors when posix_spawn fails
1616 [25733] malloc: mallopt(M_MXFAST) can set global_max_fast to 0
1617 [25734] locale: mbrtowc with Big5-HKSCS fails to reset conversion
1618 state for conversions that produce two Unicode code points
1619 [25765] nptl: Incorrect futex syscall in __pthread_disable_asynccancel
1620 for linux x86_64 leads to livelock
1621 [25788] dynamic-link: [i386] -fno-omit-frame-pointer in CFLAGS causes
1622 test failures, invalid instruction in ld.so
1623 [25790] glob: Typo in tst-fnmatch.input
1624 [25810] libc: x32: Incorrect syscall entries with pointer, off_t and
1626 [25819] localedata: Update locale data to Unicode 13.0.0
1627 [25824] libc: Abnormal function of strnlen in aarch64
1628 [25887] dynamic-link: Wasted space in _dl_x86_feature_1[1]
1629 [25896] libc: Incorrect prctl
1630 [25902] libc: Bad LOADARGS_N
1631 [25905] dynamic-link: VSX registers are corrupted during PLT
1632 resolution when glibc is built with --disable-multi-arch and --with-
1634 [25933] string: Off by one error in __strncmp_avx2 when
1635 length=VEC_SIZE*4 and strings are at page boundaries can cause a
1637 [25942] nptl: Deadlock on stack_cache_lock between __nptl_setxid and
1638 exiting detached thread
1639 [25966] libc: Incorrect access of __x86_shared_non_temporal_threshold
1641 [25976] nss: internal_end*ent in nss_compat may clobber errno, hiding
1643 [25999] nptl: Use-after-free issue in pthread_getaddr_default_np
1644 [26073] math: getpayload() has wrong return value
1645 [26076] dynamic-link: dlmopen crashes after failing to load
1646 dependencies in audit mode
1647 [26120] localedata: column width of of some Korean
1648 JUNGSEONG/JONGSEONG characters wrong (should be 0)
1649 [26128] libc: Incorrect bit_cpu_CLFLUSHOPT
1650 [26133] libc: Incorrect need_arch_feature_F16C
1651 [26137] libc: strtod() triggers exception FE_INEXACT on reasonable
1653 [26149] libc: PKU is usable only if OSPKE is set
1654 [26173] libc: powerpc64*: Add @notoc to calls to functions that do not
1656 [26208] libc: Incorrect bit_cpu_CLFSH
1657 [26210] network: Incorrect use of hidden symbols for global sunrpc
1659 [26211] stdio: printf integer overflow calculating allocation size
1660 [26214] stdio: printf_fp double free
1661 [26215] stdio: printf_fp memory leak
1662 [26232] time: FAIL: support/tst-timespec for 32-bit targets
1663 [26258] nss: nss_compat should not read input files with mmap
1664 [26332] string: Incorrect cache line size load causes memory
1665 corruption in memset
1672 * The GNU C Library now supports a feature test macro _ISOC2X_SOURCE to
1673 enable features from the draft ISO C2X standard. Only some features from
1674 this draft standard are supported by the GNU C Library, and as the draft
1675 is under active development, the set of features enabled by this macro is
1676 liable to change. Features from C2X are also enabled by _GNU_SOURCE, or
1677 by compiling with "gcc -std=gnu2x".
1679 * The <math.h> functions that round their results to a narrower type now
1680 have corresponding type-generic macros in <tgmath.h>, as defined in TS
1681 18661-1:2014 and TS 18661-3:2015 as amended by the resolution of
1682 Clarification Request 13 to TS 18661-3.
1684 * The function pthread_clockjoin_np has been added, enabling join with a
1685 terminated thread with a specific clock. It allows waiting against
1686 CLOCK_MONOTONIC and CLOCK_REALTIME. This function is a GNU extension.
1688 * New locale added: mnw_MM (Mon language spoken in Myanmar).
1690 * The DNS stub resolver will optionally send the AD (authenticated data) bit
1691 in queries if the trust-ad option is set via the options directive in
1692 /etc/resolv.conf (or if RES_TRUSTAD is set in _res.options). In this
1693 mode, the AD bit, as provided by the name server, is available to
1694 applications which call res_search and related functions. In the default
1695 mode, the AD bit is not set in queries, and it is automatically cleared in
1696 responses, indicating a lack of DNSSEC validation. (Therefore, the name
1697 servers and the network path to them are treated as untrusted.)
1699 Deprecated and removed features, and other changes affecting compatibility:
1701 * The totalorder and totalordermag functions, and the corresponding
1702 functions for other floating-point types, now take pointer arguments to
1703 avoid signaling NaNs possibly being converted to quiet NaNs in argument
1704 passing. This is in accordance with the resolution of Clarification
1705 Request 25 to TS 18661-1, as applied for C2X. Existing binaries that pass
1706 floating-point arguments directly will continue to work.
1708 * The obsolete function stime is no longer available to newly linked
1709 binaries, and its declaration has been removed from <time.h>.
1710 Programs that set the system time should use clock_settime instead.
1712 * We plan to remove the obsolete function ftime, and the header <sys/timeb.h>,
1713 in a future version of glibc. In this release, the header still exists
1714 but calling ftime will cause a compiler warning. All programs should use
1715 gettimeofday or clock_gettime instead.
1717 * The gettimeofday function no longer reports information about a
1718 system-wide time zone. This 4.2-BSD-era feature has been deprecated for
1719 many years, as it cannot handle the full complexity of the world's
1720 timezones, but hitherto we have supported it on a best-effort basis.
1721 Changes required to support 64-bit time_t on 32-bit architectures have
1722 made this no longer practical.
1724 As of this release, callers of gettimeofday with a non-null 'tzp' argument
1725 should expect to receive a 'struct timezone' whose tz_minuteswest and
1726 tz_dsttime fields are zero. (For efficiency reasons, this does not always
1727 happen on a few Linux-based ports. This will be corrected in a future
1730 All callers should supply a null pointer for the 'tzp' argument to
1731 gettimeofday. For accurate information about the time zone associated
1732 with the current time, use the localtime function.
1734 gettimeofday itself is obsolescent according to POSIX. We have no plans
1735 to remove access to this function, but portable programs should consider
1736 using clock_gettime instead.
1738 * The settimeofday function can still be used to set a system-wide time
1739 zone when the operating system supports it. This is because the Linux
1740 kernel reused the API, on some architectures, to describe a system-wide
1741 time-zone-like offset between the software clock maintained by the kernel,
1742 and the "RTC" clock that keeps time when the system is shut down.
1744 However, to reduce the odds of this offset being set by accident,
1745 settimeofday can no longer be used to set the time and the offset
1746 simultaneously. If both of its two arguments are non-null, the call
1747 will fail (setting errno to EINVAL).
1749 Callers attempting to set this offset should also be prepared for the call
1750 to fail and set errno to ENOSYS; this already happens on the Hurd and on
1751 some Linux architectures. The Linux kernel maintainers are discussing a
1752 more principled replacement for the reused API. After a replacement
1753 becomes available, we will change settimeofday to fail with ENOSYS on all
1754 platforms when its 'tzp' argument is not a null pointer.
1756 settimeofday itself is obsolescent according to POSIX. Programs that set
1757 the system time should use clock_settime and/or the adjtime family of
1758 functions instead. We may cease to make settimeofday available to newly
1759 linked binaries after there is a replacement for Linux's time-zone-like
1762 * SPARC ISA v7 is no longer supported. v8 is still supported, but only if
1763 the optional CAS instruction is implemented (for instance, LEON processors
1764 are still supported, but SuperSPARC processors are not).
1766 As the oldest 64-bit SPARC ISA is v9, this only affects 32-bit
1769 * If a lazy binding failure happens during dlopen, during the execution of
1770 an ELF constructor, the process is now terminated. Previously, the
1771 dynamic loader would return NULL from dlopen, with the lazy binding error
1772 captured in a dlerror message. In general, this is unsafe because
1773 resetting the stack in an arbitrary function call is not possible.
1775 * For MIPS hard-float ABIs, the GNU C Library will be configured to need an
1776 executable stack unless explicitly configured at build time to require
1777 minimum kernel version 4.8 or newer. This is because executing
1778 floating-point branches on a non-executable stack on Linux kernels prior to
1779 4.8 can lead to application crashes for some MIPS configurations. While
1780 currently PT_GNU_STACK is not widely used on MIPS, future releases of GCC are
1781 expected to enable non-executable stack by default with PT_GNU_STACK by
1782 default and is thus likely to trigger a crash on older kernels.
1784 The GNU C Library can be built with --enable-kernel=4.8.0 in order to keep a
1785 non-executable stack while dropping support for older kernels.
1787 * System call wrappers for time system calls now use the new time64 system
1788 calls when available. On 32-bit targets, these wrappers attempt to call
1789 the new system calls first and fall back to the older 32-bit time system
1790 calls if they are not present. This may cause issues in environments
1791 that cannot handle unsupported system calls gracefully by returning
1792 -ENOSYS. Seccomp sandboxes are affected by this issue.
1794 Changes to build and runtime requirements:
1796 * It is no longer necessary to have recent Linux kernel headers to build
1797 working (non-stub) system call wrappers on all architectures except 64-bit
1798 RISC-V. 64-bit RISC-V requires a minimum kernel headers version of 5.0.
1800 * The ChangeLog file is no longer present in the toplevel directory of the
1801 source tree. ChangeLog files are located in the ChangeLog.old directory as
1802 ChangeLog.N where the highest N has the latest entries.
1804 Security related changes:
1806 CVE-2020-1751: A defect in the PowerPC backtrace function could cause an
1807 out-of-bounds write when executed in a signal frame context.
1809 CVE-2019-19126: ld.so failed to ignore the LD_PREFER_MAP_32BIT_EXEC
1810 environment variable during program execution after a security
1811 transition, allowing local attackers to restrict the possible mapping
1812 addresses for loaded libraries and thus bypass ASLR for a setuid
1813 program. Reported by Marcin Kościelnicki.
1815 The following bugs are resolved with this release:
1817 [12031] localedata: iconv -t ascii//translit with Greek characters
1818 [15813] libc: Multiple issues in __gen_tempname
1819 [17726] libc: [arm, sparc] profil_counter should be compat symbol
1820 [18231] libc: ipc_perm struct's mode member has wrong type in sys/ipc.h
1821 [19767] libc: vdso is not used with static linking
1822 [19903] hurd: Shared mappings not being inherited by children processes
1823 [20358] network: RES_USE_DNSSEC sets DO; should also have a way to set AD
1824 [20839] dynamic-link: Incomplete rollback of dynamic linker state on
1826 [23132] localedata: Missing transliterations in Miscellaneous Mathematical
1827 Symbols-A/B Unicode blocks
1828 [23518] libc: Eliminate __libc_utmp_jump_table
1829 [24026] malloc: malloc_info() returns wrong numbers
1830 [24054] localedata: Many locales are missing date_fmt
1831 [24214] dynamic-link: user defined ifunc resolvers may run in ldd mode
1832 [24304] dynamic-link: Lazy binding failure during ELF
1833 constructors/destructors is not fatal
1834 [24376] libc: RISC-V symbol size confusion with _start
1835 [24682] localedata: zh_CN first weekday should be Monday per GB/T
1837 [24824] libc: test-in-container does not install charmap files compatible
1839 [24844] regex: regex bad pointer / leakage if malloc fails
1840 [24867] malloc: Unintended malloc_info formatting changes
1841 [24879] libc: login: utmp alarm timer can arrive after lock acquisition
1842 [24880] libc: login: utmp implementation uses struct flock with fcntl64
1843 [24882] libc: login: pututline uses potentially outdated cache
1844 [24899] libc: Missing nonstring attributes in <utmp.h>, <utmpx.h>
1845 [24902] libc: login: Repeating pututxline on EINTR/EAGAIN causes stale
1847 [24916] dynamic-link: [MIPS] Highest EI_ABIVERSION value not raised to
1849 [24930] dynamic-link: dlopen of PIE executable can result in
1850 _dl_allocate_tls_init assertion failure
1851 [24950] localedata: Top-of-tree glibc does not build with top-of-tree GCC
1852 (stringop-overflow error)
1853 [24959] time: librt IFUNC resolvers for clock_gettime and clock_*
1854 functions other can lead to crashes
1855 [24967] libc: jemalloc static linking causes runtime failure
1856 [24986] libc: alpha: new getegid, geteuid and getppid syscalls used
1858 [25035] libc: sbrk() failure handled poorly in tunables_strdup
1859 [25087] dynamic-link: ldconfig mishandles unusual .dynstr placement
1860 [25097] libc: new -Warray-bounds with GCC 10
1861 [25112] dynamic-link: dlopen must not make new objects accessible when it
1862 still can fail with an error
1863 [25139] localedata: Please add the new mnw_MM locale
1864 [25149] regex: Array bounds violation in proceed_next_node
1865 [25157] dynamic-link: Audit cookie for the dynamic loader is not
1866 initialized correctly
1867 [25189] libc: glibc's __glibc_has_include causes issues with clang
1869 [25194] malloc: malloc.c: do_set_mxfast incorrectly casts the mallopt
1870 value to an unsigned
1871 [25204] dynamic-link: LD_PREFER_MAP_32BIT_EXEC not ignored in setuid
1872 binaries (CVE-2019-19126)
1873 [25225] libc: ld.so fails to link on x86 if GCC defaults to -fcf-
1875 [25226] string: strstr: Invalid result if needle crosses page on s390-z15
1877 [25232] string: <string.h> does not enable const correctness for strchr et
1879 [25233] localedata: Consider "." as the thousands separator for sl_SI
1881 [25241] nptl: __SIZEOF_PTHREAD_MUTEX_T defined twice for x86
1882 [25251] build: Failure to run tests when CFLAGS contains -DNDEBUG.
1883 [25271] libc: undeclared identifier PTHREAD_MUTEX_DEFAULT when compiling
1885 [25323] localedata: km_KH: d_t_fmt contains "m" instead of "%M"
1886 [25324] localedata: lv_LV: d_t_fmt contains suspicious words in the time
1888 [25396] dynamic-link: Failing dlopen can leave behind dangling GL
1889 (dl_initfirst) link map pointer
1890 [25401] malloc: pvalloc must not have __attribute_alloc_size__
1891 [25423] libc: Array overflow in backtrace on powerpc
1892 [25425] network: Missing call to __resolv_context_put in
1893 getaddrinfo.c:gethosts
1900 * Unicode 12.1.0 Support: Character encoding, character type info, and
1901 transliteration tables are all updated to Unicode 12.1.0, using
1902 generator scripts contributed by Mike FABIAN (Red Hat).
1904 * The dynamic linker accepts the --preload argument to preload shared
1905 objects, in addition to the LD_PRELOAD environment variable.
1907 * The twalk_r function has been added. It is similar to the existing
1908 twalk function, but it passes an additional caller-supplied argument
1909 to the callback function.
1911 * On Linux, the getdents64, gettid, and tgkill functions have been added.
1913 * Minguo (Republic of China) calendar support has been added as an
1914 alternative calendar for the following locales: zh_TW, cmn_TW, hak_TW,
1917 * The entry for the new Japanese era has been added for ja_JP locale.
1919 * Memory allocation functions malloc, calloc, realloc, reallocarray, valloc,
1920 pvalloc, memalign, and posix_memalign fail now with total object size
1921 larger than PTRDIFF_MAX. This is to avoid potential undefined behavior with
1922 pointer subtraction within the allocated object, where results might
1923 overflow the ptrdiff_t type.
1925 * The dynamic linker no longer refuses to load objects which reference
1926 versioned symbols whose implementation has moved to a different soname
1927 since the object has been linked. The old error message, symbol
1928 FUNCTION-NAME, version SYMBOL-VERSION not defined in file DSO-NAME with
1929 link time reference, is gone.
1931 * Add new POSIX-proposed pthread_cond_clockwait, pthread_mutex_clocklock,
1932 pthread_rwlock_clockrdlock, pthread_rwlock_clockwrlock and sem_clockwait
1933 functions. These behave similarly to their "timed" equivalents, but also
1934 accept a clockid_t parameter to determine which clock their timeout should
1935 be measured against. All functions allow waiting against CLOCK_MONOTONIC
1936 and CLOCK_REALTIME. The decision of which clock to be used is made at the
1937 time of the wait (unlike with pthread_condattr_setclock, which requires
1938 the clock choice at initialization time).
1940 * On AArch64 the GNU IFUNC resolver call ABI changed: old resolvers still
1941 work, new resolvers can use a second argument which can be extended in
1942 the future, currently it contains the AT_HWCAP2 value.
1944 Deprecated and removed features, and other changes affecting compatibility:
1946 * The copy_file_range function fails with ENOSYS if the kernel does not
1947 support the system call of the same name. Previously, user space
1948 emulation was performed, but its behavior did not match the kernel
1949 behavior, which was deemed too confusing. Applications which use the
1950 copy_file_range function can no longer rely on glibc to provide a fallback
1951 on kernels that do not support the copy_file_range system call, and if
1952 this function returns ENOSYS, they will need to use their own fallback.
1953 Support for copy_file_range for most architectures was added in version
1954 4.5 of the mainline Linux kernel.
1956 * The functions clock_gettime, clock_getres, clock_settime,
1957 clock_getcpuclockid, clock_nanosleep were removed from the librt library
1958 for new applications (on architectures which had them). Instead, the
1959 definitions in libc will be used automatically, which have been available
1962 * The obsolete and never-implemented XSI STREAMS header files <stropts.h>
1963 and <sys/stropts.h> have been removed.
1965 * Support for the "inet6" option in /etc/resolv.conf and the RES_USE_INET6
1966 resolver flag (deprecated in glibc 2.25) have been removed.
1968 * The obsolete RES_INSECURE1 and RES_INSECURE2 option flags for the DNS stub
1969 resolver have been removed from <resolv.h>.
1971 * With --enable-bind-now, installed programs are now linked with the
1974 * Support for the PowerPC SPE ISA extension (powerpc-*-*gnuspe*
1975 configurations) has been removed, following the deprecation of this
1976 subarchitecture in version 8 of GCC, and its removal in version 9.
1978 * On 32-bit Arm, support for the port-based I/O emulation and the <sys/io.h>
1979 header have been removed.
1981 * The Linux-specific <sys/sysctl.h> header and the sysctl function have been
1982 deprecated and will be removed from a future version of glibc.
1983 Application should directly access /proc instead. For obtaining random
1984 bits, the getentropy function can be used.
1986 Changes to build and runtime requirements:
1988 * GCC 6.2 or later is required to build the GNU C Library.
1990 Older GCC versions and non-GNU compilers are still supported when
1991 compiling programs that use the GNU C Library.
1993 Security related changes:
1995 CVE-2019-7309: x86-64 memcmp used signed Jcc instructions to check
1996 size. For x86-64, memcmp on an object size larger than SSIZE_MAX
1997 has undefined behavior. On x32, the size_t argument may be passed
1998 in the lower 32 bits of the 64-bit RDX register with non-zero upper
1999 32 bits. When it happened with the sign bit of RDX register set,
2000 memcmp gave the wrong result since it treated the size argument as
2001 zero. Reported by H.J. Lu.
2003 CVE-2019-9169: Attempted case-insensitive regular-expression match
2004 via proceed_next_node in posix/regexec.c leads to heap-based buffer
2005 over-read. Reported by Hongxu Chen.
2007 The following bugs are resolved with this release:
2009 [2872] locale: Transliteration Cyrillic -> ASCII fails
2010 [6399] libc: gettid() should have a wrapper
2011 [16573] malloc: mtrace hangs when MALLOC_TRACE is defined
2012 [16976] glob: fnmatch unbounded stack VLA for collating symbols
2013 [17396] localedata: globbing for locale by [[.collating-element.]]
2014 [18035] dynamic-link: pldd does no longer work, enters infinite loop
2015 [18465] malloc: memusagestat is built using system C library
2016 [18830] locale: iconv -c -f ascii with >buffer size worth of input before
2017 invalid input drops valid char
2018 [20188] nptl: libpthread IFUNC resolver for vfork can lead to crash
2019 [20568] locale: Segfault with wide characters and setlocale/fgetwc/UTF-8
2020 [21897] localedata: Afar locales: Fix mon, abmon, and abday
2021 [22964] localedata: The Japanese Era name will be changed on May 1, 2019
2022 [23352] malloc: __malloc_check_init still defined in public header
2024 [23403] nptl: Wrong alignment of TLS variables
2025 [23501] libc: nftw() doesn't return dangling symlink's inode
2026 [23733] malloc: Check the count before calling tcache_get()
2027 [23741] malloc: Missing __attribute_alloc_size__ in many allocation
2029 [23831] localedata: nl_NL missing LC_NUMERIC thousands_sep
2030 [23844] nptl: pthread_rwlock_trywrlock results in hang
2031 [23983] argparse: Missing compat versions of argp_failure and argp_error
2032 for long double = double
2033 [23984] libc: Missing compat versions of err.h and error.h functions for
2034 long double = double
2035 [23996] localedata: Dutch salutations
2036 [24040] libc: riscv64: unterminated call chain in __thread_start
2037 [24047] network: libresolv should use IP_RECVERR/IPV6_RECVERR to avoid
2039 [24051] stdio: puts and putchar output to _IO_stdout instead of stdout
2040 [24059] nss: nss_files: get_next_alias calls fgets_unlocked without
2042 [24114] regex: regexec buffer read overrun in "grep -i
2043 '\(\(\)*.\)*\(\)\(\)\1'"
2044 [24122] libc: Segfaults if 0 returned from la_version
2045 [24153] stdio: Some input functions do not react to stdin assignment
2046 [24155] string: x32 memcmp can treat positive length as 0 (if sign bit in
2047 RDX is set) (CVE-2019-7309)
2048 [24161] nptl: __run_fork_handlers self-deadlocks in malloc/tst-mallocfork2
2049 [24164] libc: Systemtap probes need to use "nr" constraint on 32-bit Arm,
2050 not the default "nor"
2051 [24166] dynamic-link: Dl_serinfo.dls_serpath[1] in dlfcn.h causes UBSAN
2052 false positives, change to modern flexible array
2053 [24180] nptl: pthread_mutex_trylock does not use the correct order of
2054 instructions while maintaining the robust mutex list due to missing
2056 [24194] librt: Non-compatibility symbols for clock_gettime etc. cause
2057 unnecessary librt dependencies
2058 [24200] localedata: Revert first_weekday removal in en_IE locale
2059 [24211] nptl: Use-after-free in Systemtap probe in pthread_join
2060 [24215] nptl: pthread_timedjoin_np should be a cancellation point
2061 [24216] malloc: Check for large bin list corruption when inserting
2063 [24228] stdio: old x86 applications that use legacy libio crash on exit
2064 [24231] dynamic-link: [sparc64] R_SPARC_H34 implementation falls through
2066 [24293] localedata: Missing Minguo calendar support for TW locales
2067 [24296] localedata: Orthographic mistakes in 'day' and 'abday' sections in
2068 tt_RU (Tatar) locale
2069 [24307] localedata: Update locale data to Unicode 12.0.0
2070 [24323] dynamic-link: dlopen should not be able open PIE objects
2071 [24335] build: "Obsolete types detected" with Linux 5.0 headers
2072 [24369] localedata: Orthographic mistakes in 'mon' and 'abmon' sections in
2073 tt_RU (Tatar) locale
2074 [24370] localedata: Add lang_name for tt_RU locale
2075 [24372] locale: Binary locale files are not architecture independent
2076 [24394] time: strptime %Ey mis-parses final year of era
2077 [24476] dynamic-link: __libc_freeres triggers bad free in libdl if dlerror
2079 [24506] dynamic-link: FAIL: elf/tst-pldd with --enable-hardcoded-path-in-
2081 [24531] malloc: Malloc tunables give tcache assertion failures
2082 [24532] libc: conform/arpa/inet.h failures due to linux kernel 64-bit
2084 [24535] localedata: Update locale data to Unicode 12.1.0
2085 [24537] build: nptl/tst-eintr1 test case can hit task limits on some
2086 kernels and break testing
2087 [24544] build: elf/tst-pldd doesn't work if you install with a --prefix
2088 [24556] build: [GCC 9] error: ‘%s’ directive argument is null
2089 [-Werror=format-overflow=]
2090 [24570] libc: alpha: compat msgctl uses __IPC_64
2091 [24584] locale: Data race in __wcsmbs_clone_conv
2092 [24588] stdio: Remove codecvt vtables from libio
2093 [24603] math: sysdeps/ieee754/dbl-64/branred.c is slow when compiled with
2095 [24614] localedata: nl_NL LC_MONETARY doesn't match CLDR 35
2096 [24632] stdio: Old binaries which use freopen with default stdio handles
2098 [24640] libc: __ppc_get_timebase_freq() always return 0 when using static
2100 [24652] localedata: szl_PL spelling correction
2101 [24695] nss: nss_db: calling getpwent after endpwent crashes
2102 [24696] nss: endgrent() clobbers errno=ERRNO for 'group: db files' entry
2103 in /etc/nsswitch.conf
2104 [24699] libc: mmap64 with very large offset broken on MIPS64 n32
2105 [24740] libc: getdents64 type confusion
2106 [24741] dynamic-link: ld.so should not require that a versioned symbol is
2107 always implemented in the same library
2108 [24744] libc: Remove copy_file_range emulation
2109 [24757] malloc: memusagestat is linked against system libpthread
2110 [24794] libc: Partial test suite run builds corrupt test-in-container
2118 * The getcpu wrapper function has been added, which returns the currently
2119 used CPU and NUMA node. This function is Linux-specific.
2121 * A new convenience target has been added for distribution maintainers
2122 to build and install all locales as directories with files. The new
2123 target is run by issuing the following command in your build tree:
2124 'make localedata/install-locale-files', with an optional DESTDIR
2125 to set the install root if you wish to install into a non-default
2126 configured location.
2128 * Optimized generic exp, exp2, log, log2, pow, sinf, cosf, sincosf and tanf.
2130 * The reallocarray function is now declared under _DEFAULT_SOURCE, not just
2131 for _GNU_SOURCE, to match BSD environments.
2133 * For powercp64le ABI, Transactional Lock Elision is now enabled iff kernel
2134 indicates that it will abort the transaction prior to entering the kernel
2135 (PPC_FEATURE2_HTM_NOSC on hwcap2). On older kernels the transaction is
2136 suspended, and this caused some undefined side-effects issues by aborting
2137 transactions manually. Glibc avoided it by abort transactions manually on
2138 each syscall, but it lead to performance issues on newer kernels where the
2139 HTM state is saved and restore lazily (the state being saved even when the
2140 process actually does not use HTM).
2142 * The functions posix_spawn_file_actions_addchdir_np and
2143 posix_spawn_file_actions_addfchdir_np have been added, enabling
2144 posix_spawn and posix_spawnp to run the new process in a different
2145 directory. These functions are GNU extensions. The function
2146 posix_spawn_file_actions_addchdir_np is similar to the Solaris function
2149 * The popen and system do not run atfork handlers anymore (BZ#17490).
2150 Although it is a possible POSIX violation, the POSIX rationale in
2151 pthread_atfork documentation regarding atfork handlers is to handle
2152 inconsistent mutex state after a fork call in a multi-threaded process.
2153 In both popen and system there is no direct access to user-defined mutexes.
2155 * Support for the C-SKY ABIV2 running on Linux has been added. This port
2156 requires at least binutils-2.32, gcc-9.0, and linux-4.20. Two ABIs are
2158 - C-SKY ABIV2 soft-float little-endian
2159 - C-SKY ABIV2 hard-float little-endian
2161 * strftime's default formatting of a locale's alternative year (%Ey)
2162 has been changed to zero-pad the year to a minimum of two digits,
2163 like "%y". This improves the display of Japanese era years during
2164 the first nine years of a new era, and is expected to be harmless
2165 for all other locales (only Japanese locales regularly have
2166 alternative year numbers less than 10). Zero-padding can be
2167 overridden with the '_' or '-' flags (which are GNU extensions).
2169 * As a GNU extension, the '_' and '-' flags can now be applied to
2170 "%EY" to control how the year number is formatted; they have the
2171 same effect that they would on "%Ey".
2173 Deprecated and removed features, and other changes affecting compatibility:
2175 * The glibc.tune tunable namespace has been renamed to glibc.cpu and the
2176 tunable glibc.tune.cpu has been renamed to glibc.cpu.name.
2178 * The type of the pr_uid and pr_gid members of struct elf_prpsinfo, defined
2179 in <sys/procfs.h>, has been corrected to match the type actually used by
2180 the Linux kernel. This affects the size and layout of that structure on
2181 MicroBlaze, MIPS (n64 ABI only), Nios II and RISC-V.
2183 * For the MIPS n32 ABI, the type of the pr_sigpend and pr_sighold members of
2184 struct elf_prstatus, and the pr_flag member of struct elf_prpsinfo,
2185 defined in <sys/procfs.h>, has been corrected to match the type actually
2186 used by the Linux kernel. This affects the size and layout of those
2189 * An archaic GNU extension to scanf, under which '%as', '%aS', and '%a[...]'
2190 meant to scan a string and allocate space for it with malloc, is now
2191 restricted to programs compiled in C89 or C++98 mode with _GNU_SOURCE
2192 defined. This extension conflicts with C99's use of '%a' to scan a
2193 hexadecimal floating-point number, which is now available to programs
2194 compiled as C99 or C++11 or higher, regardless of _GNU_SOURCE.
2196 POSIX.1-2008 includes the feature of allocating a buffer for string input
2197 with malloc, using the modifier letter 'm' instead. Programs using
2198 '%as', '%aS', or '%a[...]' with the old GNU meaning should change to
2199 '%ms', '%mS', or '%m[...]' respectively. Programs that wish to use the
2200 C99 '%a' no longer need to avoid _GNU_SOURCE.
2202 GCC's -Wformat warnings can detect most uses of this extension, as long
2203 as all functions that call vscanf, vfscanf, or vsscanf are annotated with
2204 __attribute__ ((format (scanf, ...))).
2206 Changes to build and runtime requirements:
2208 * Python 3.4 or later is required to build the GNU C Library.
2210 * On most architectures, GCC 5 or later is required to build the GNU C
2211 Library. (On powerpc64le, GCC 6.2 or later is still required, as before.)
2213 Older GCC versions and non-GNU compilers are still supported when
2214 compiling programs that use the GNU C Library.
2216 Security related changes:
2218 CVE-2018-19591: A file descriptor leak in if_nametoindex can lead to a
2219 denial of service due to resource exhaustion when processing getaddrinfo
2220 calls with crafted host names. Reported by Guido Vranken.
2222 CVE-2019-6488: On x32, the size_t parameter may be passed in the lower
2223 32 bits of a 64-bit register with with non-zero upper 32 bit. When it
2224 happened, accessing the 32-bit size_t value as the full 64-bit register
2225 in the assembly string/memory functions would cause a buffer overflow.
2226 Reported by H.J. Lu.
2228 CVE-2016-10739: The getaddrinfo function could successfully parse IPv4
2229 addresses with arbitrary trailing characters, potentially leading to data
2230 or command injection issues in applications.
2232 The following bugs are resolved with this release:
2234 [10425] localedata: it_IT/it_CH: LC_TIME format is wrong
2235 [10496] localedata: 12h time representation in multiple locales faulty
2236 [10797] localedata: it_IT locale numeric does not have a separator for
2238 [11319] libc: dprintf doesn't handle errors properly
2239 [16346] time: mktime: potentially unsafe use of localtime_offset
2240 [17248] build: glibc should not sort CFLAGS (support gcc plugins and
2242 [17405] libc: Implement posix_spawn_file_actions_addchdir_np,
2243 posix_spawn_file_actions_addfchdir_np
2244 [17426] localedata: Indian locales: set the correct date format
2245 [17490] stdio: popen should not invoke atfork handlers
2246 [17783] libc: TIOCSER_TEMT conditions inconsistent
2247 [18040] regex: use-after-free in regexec/get_subexp
2248 [18093] libc: Corrupted aux-cache causes ldconfig to segfault
2249 [20018] network: getaddrinfo should reject IP addresses with trailing
2250 characters (CVE-2016-10739)
2251 [20209] localedata: Spelling mistake for Sunday in Greenlandic kl_GL
2252 [20271] libc: Missing "\n" in __libc_fatal calls
2253 [20480] dynamic-link: Patch: ifunc not executable, crashes sudo qemu
2254 [20544] libc: RFE: atexit, __cxa_atexit, on_exit should assert function
2255 pointer argument is non-NULL
2256 [21037] stdio: open_memstream and freopen
2257 [21286] libc: bits/siginfo.h is missing enum definition for TRAP_HWBKPT
2258 [21716] time: Crash in glibc's mktime in low-memory situations
2259 [22834] stdio: Subprocess forked by popen may crash in Linux when
2260 multithreads call popen
2261 [22927] network: crash in vn_gai_enqueue_request if requests_tail was NULL
2262 and pthread_create fails.
2263 [23032] hurd: sysdeps/htl/pt-barrier-init.c:39: bad call to memcmp ?
2264 [23125] libc: riscv64: endless loop when throwing an exception from a
2266 [23275] nptl: Race in pthread_mutex_lock while promoting to
2267 PTHREAD_MUTEX_ELISION_NP.
2268 [23400] libc: stdlib/test-bz22786.c creates temporary files in glibc
2270 [23479] math: [mips] bits/fenv.h should not define some macros for soft-
2272 [23490] libc: sysdeps/unix/sysv/linux/x86/tst-cet-property-2.c:49: off by
2274 [23497] libc: readdir64@GLIBC_2.1 cannot parse the kernel directory stream
2275 [23509] dynamic-link: CET enabled glibc is incompatible with the older
2277 [23520] nscd: nscd: Use-after-free in addgetnetgrentX and its callers
2278 [23521] nss: get_next_alias nss_files file stream leak
2279 [23538] nptl: Hang in pthread_cond_broadcast
2280 [23562] libc: Wrong type for si_band in Linux-specific siginfo_t
2281 [23578] regex: Invalid memory access if regex pattern contains NUL byte
2282 [23579] libc: Errors misreported in preadv2
2283 [23597] build: support/test-container.c doesn't work with different
2285 [23603] time: mktime signed integer overflow on large timestamps
2286 [23606] libc: Missing ENDBR32 in sysdeps/i386/start.S
2287 [23614] libc: powerpc: missing CFI register information in __mpn_*
2289 [23637] string: Generic strstr/strcasestr fails with huge needles
2290 [23640] libc: no way to easily clear FD_CLOEXEC in
2291 posix_spawn_file_actions_adddup2()
2292 [23649] libc: [microblaze/mips/nios2/riscv] sys/procfs.h pr_uid, pr_gid
2294 [23656] libc: [mips n32] sys/procfs.h pr_sigpend, pr_sighold, pr_flag have
2296 [23679] libc: gethostid: Missing NULL check for gethostbyname_r result
2297 [23689] libc: Bug in documentation for rusage.ru_ixrss in
2298 bits/types/struct_rusage.h
2299 [23690] dynamic-link: Segfault in _dl_profile_fixup with a high number of
2301 [23707] dynamic-link: Missing unwind info in sysdeps/powerpc/powerpc32/dl-
2303 [23709] string: glibc 2.25 lacks sse2 optimized strstr()
2304 [23716] dynamic-link: _dl_runtime_resolve_shstk isn't selected properly
2305 [23717] libc: glibc: stdlib/tst-setcontext9 test suite failure on
2307 [23724] localedata: Albanian date formats are incorrect
2308 [23735] math: libnldbl_nonshared.a references internal libm symbols
2309 [23740] localedata: kl_GL: Month names and date formats need update
2310 [23744] regex: regex refactorings to remove BE, avoid duplication
2311 [23745] time: mktime fix for Gnulib + coreutils
2312 [23758] time: Improve the width of alternate representation for year in
2314 [23783] libc: [mips] Missing CMSPAR bits/termios.h
2315 [23789] time: mktime does not set errno on failure
2316 [23791] localedata: Wrong monetary format for ca_ES locale
2317 [23793] locale: c32rtomb and mbrtoc32 should not alias wcrtomb and mbrtowc
2318 [23794] locale: c16rtomb does not handle surrogate pairs
2319 [23821] libc: si_band in siginfo_t has wrong type long int on sparc64
2320 [23822] math: ia64 static libm.a is missing exp2f, log2f and powf symbols
2321 [23836] time: time/tst-mktime2 test failure on Arm (32-bit)
2322 [23848] libc: [sparc] Some socket syscalls wrongly assumed to be present
2323 [23861] nptl: rdlock stalls indefinitely on an unlocked pthread rwlock
2324 [23862] libc: [sh] missing kernel-features.h undefines
2325 [23864] libc: [riscv] missing kernel-features.h undefines
2326 [23867] libc: [arm/microblaze] __ASSUME_MLOCK2 incorrect
2327 [23907] malloc: Incorrect double-free malloc tcache check disregards
2329 [23913] libc: off-by-one in function maybe_script_execute in
2330 sysdeps/posix/spawni.c
2331 [23915] libc: [arm] __ASSUME_COPY_FILE_RANGE incorrect
2332 [23923] locale: Add --no-hard-links option to localedef
2333 [23927] network: Linux if_nametoindex() does not close descriptor
2335 [23961] math: powf can overflow to inf without setting errno in non-
2336 nearest rounding mode
2337 [23967] libc: [2.28 Regression]: New sigaction implementation breaks m68k
2338 [23972] libc: __old_getdents64 uses wrong d_off value on overflow
2339 [23993] libc: glibc 2.29 doesn't build with gcc 4.9
2340 [23995] localedata: Remove execution flags from localedata/locales/bi_VU
2341 [24011] localedata: Fixed small type in comment for locale bs_BA
2342 [24018] libc: gettext() may return NULL
2343 [24022] build: riscv build failure with Linux kernel 4.20-rc7
2344 [24023] build: [2.29 Regression] FAIL: elf/check-localplt
2345 [24024] string: strerror() might set errno to ENOMEM due to -fno-math-
2347 [24027] malloc: glibc: realloc() ncopies 32-bit integer overflow
2348 [24034] libc: tst-cancel21-static fails with SIGBUS on pre-ARMv7 when
2350 [24046] localedata: en_US locale doesn't define date_fmt
2351 [24063] manual: @var{errno} should be @code{errno}
2352 [24066] soft-fp: Inconsistent _FP_W_TYPE_SIZE check
2353 [24088] libc: VSCR field is not being correctly read in ucontext_t on
2355 [24096] time: Specifying '_' or '-' flag for "%EY" does not produce the
2357 [24097] string: Can't use 64-bit register for size_t in assembly codes for
2359 [24110] hurd: SS_DISABLE never set in stack_t value returned by
2361 [24112] network: Do not send DNS queries for non-host names (where all
2362 answers will be rejected)
2363 [24130] libc: alpha __remqu corrupts $f3 register
2370 * The localization data for ISO 14651 is updated to match the 2016
2371 Edition 4 release of the standard, this matches data provided by
2372 Unicode 9.0.0. This update introduces significant improvements to the
2373 collation of Unicode characters. This release deviates slightly from
2374 the standard in that the collation element ordering for lowercase and
2375 uppercase LATIN script characters is adjusted to ensure that regular
2376 expressions with ranges like [a-z] and [A-Z] don't interleave e.g. A
2377 is not matched by [a-z]. With the update many locales have been
2378 updated to take advantage of the new collation information. The new
2379 collation information has increased the size of the compiled locale
2380 archive or binary locales.
2382 * The GNU C Library can now be compiled with support for Intel CET, AKA
2383 Intel Control-flow Enforcement Technology. When the library is built
2384 with --enable-cet, the resulting glibc is protected with indirect
2385 branch tracking (IBT) and shadow stack (SHSTK). CET-enabled glibc is
2386 compatible with all existing executables and shared libraries. This
2387 feature is currently supported on i386, x86_64 and x32 with GCC 8 and
2388 binutils 2.29 or later. Note that CET-enabled glibc requires CPUs
2389 capable of multi-byte NOPs, like x86-64 processors as well as Intel
2390 Pentium Pro or newer. NOTE: --enable-cet has been tested for i686,
2391 x86_64 and x32 on non-CET processors. --enable-cet has been tested
2392 for x86_64 and x32 on CET SDVs, but Intel CET support hasn't been
2395 * The GNU C Library now has correct support for ABSOLUTE symbols
2396 (SHN_ABS-relative symbols). Previously such ABSOLUTE symbols were
2397 relocated incorrectly or in some cases discarded. The GNU linker can
2398 make use of the newer semantics, but it must communicate it to the
2399 dynamic loader by setting the ELF file's identification (EI_ABIVERSION
2400 field) to indicate such support is required.
2402 * Unicode 11.0.0 Support: Character encoding, character type info, and
2403 transliteration tables are all updated to Unicode 11.0.0, using
2404 generator scripts contributed by Mike FABIAN (Red Hat).
2406 * <math.h> functions that round their results to a narrower type are added
2407 from TS 18661-1:2014 and TS 18661-3:2015:
2409 - fadd, faddl, daddl and corresponding fMaddfN, fMaddfNx, fMxaddfN and
2410 fMxaddfNx functions.
2412 - fsub, fsubl, dsubl and corresponding fMsubfN, fMsubfNx, fMxsubfN and
2413 fMxsubfNx functions.
2415 - fmul, fmull, dmull and corresponding fMmulfN, fMmulfNx, fMxmulfN and
2416 fMxmulfNx functions.
2418 - fdiv, fdivl, ddivl and corresponding fMdivfN, fMdivfNx, fMxdivfN and
2419 fMxdivfNx functions.
2421 * Two grammatical forms of month names are now supported for the following
2422 languages: Armenian, Asturian, Catalan, Czech, Kashubian, Occitan, Ossetian,
2423 Scottish Gaelic, Upper Sorbian, and Walloon. The following languages now
2424 support two grammatical forms in abbreviated month names: Catalan, Greek,
2427 * Newly added locales: Lower Sorbian (dsb_DE) and Yakut (sah_RU) also
2428 include the support for two grammatical forms of month names.
2430 * Building and running on GNU/Hurd systems now works without out-of-tree
2433 * The renameat2 function has been added, a variant of the renameat function
2434 which has a flags argument. If the flags are zero, the renameat2 function
2435 acts like renameat. If the flag is not zero and there is no kernel
2436 support for renameat2, the function will fail with an errno value of
2437 EINVAL. This is different from the existing gnulib function renameatu,
2438 which performs a plain rename operation in case of a RENAME_NOREPLACE
2439 flags and a non-existing destination (and therefore has a race condition
2440 that can clobber the destination inadvertently).
2442 * The statx function has been added, a variant of the fstatat64
2443 function with an additional flags argument. If there is no direct
2444 kernel support for statx, glibc provides basic stat support based on
2445 the fstatat64 function.
2447 * IDN domain names in getaddrinfo and getnameinfo now use the system libidn2
2448 library if installed. libidn2 version 2.0.5 or later is recommended. If
2449 libidn2 is not available, internationalized domain names are not encoded
2450 or decoded even if the AI_IDN or NI_IDN flags are passed to getaddrinfo or
2451 getnameinfo. (getaddrinfo calls with non-ASCII names and AI_IDN will fail
2452 with an encoding error.) Flags which used to change the IDN encoding and
2453 decoding behavior (AI_IDN_ALLOW_UNASSIGNED, AI_IDN_USE_STD3_ASCII_RULES,
2454 NI_IDN_ALLOW_UNASSIGNED, NI_IDN_USE_STD3_ASCII_RULES) have been
2455 deprecated. They no longer have any effect.
2457 * Parsing of dynamic string tokens in DT_RPATH, DT_RUNPATH, DT_NEEDED,
2458 DT_AUXILIARY, and DT_FILTER has been expanded to support the full
2459 range of ELF gABI expressions including such constructs as
2460 '$ORIGIN$ORIGIN' (if valid). For SUID/GUID applications the rules
2461 have been further restricted, and where in the past a dynamic string
2462 token sequence may have been interpreted as a literal string it will
2463 now cause a load failure. These load failures were always considered
2464 unspecified behaviour from the perspective of the dynamic loader, and
2465 for safety are now load errors e.g. /foo/${ORIGIN}.so in DT_NEEDED
2466 results in a load failure now.
2468 * Support for ISO C threads (ISO/IEC 9899:2011) has been added. The
2469 implementation includes all the standard functions provided by
2472 - thrd_current, thrd_equal, thrd_sleep, thrd_yield, thrd_create,
2473 thrd_detach, thrd_exit, and thrd_join for thread management.
2475 - mtx_init, mtx_lock, mtx_timedlock, mtx_trylock, mtx_unlock, and
2476 mtx_destroy for mutual exclusion.
2478 - call_once for function call synchronization.
2480 - cnd_broadcast, cnd_destroy, cnd_init, cnd_signal, cnd_timedwait, and
2481 cnd_wait for conditional variables.
2483 - tss_create, tss_delete, tss_get, and tss_set for thread-local storage.
2485 Application developers must link against libpthread to use ISO C threads.
2487 Deprecated and removed features, and other changes affecting compatibility:
2489 * The nonstandard header files <libio.h> and <_G_config.h> are no longer
2490 installed. Software that was using either header should be updated to
2491 use standard <stdio.h> interfaces instead.
2493 * The stdio functions 'getc' and 'putc' are no longer defined as macros.
2494 This was never required by the C standard, and the macros just expanded
2495 to call alternative names for the same functions. If you hoped getc and
2496 putc would provide performance improvements over fgetc and fputc, instead
2497 investigate using (f)getc_unlocked and (f)putc_unlocked, and, if
2498 necessary, flockfile and funlockfile.
2500 * All stdio functions now treat end-of-file as a sticky condition. If you
2501 read from a file until EOF, and then the file is enlarged by another
2502 process, you must call clearerr or another function with the same effect
2503 (e.g. fseek, rewind) before you can read the additional data. This
2504 corrects a longstanding C99 conformance bug. It is most likely to affect
2505 programs that use stdio to read interactive input from a terminal.
2508 * The macros 'major', 'minor', and 'makedev' are now only available from
2509 the header <sys/sysmacros.h>; not from <sys/types.h> or various other
2510 headers that happen to include <sys/types.h>. These macros are rarely
2511 used, not part of POSIX nor XSI, and their names frequently collide with
2512 user code; see https://sourceware.org/bugzilla/show_bug.cgi?id=19239 for
2513 further explanation.
2515 <sys/sysmacros.h> is a GNU extension. Portable programs that require
2516 these macros should first include <sys/types.h>, and then include
2517 <sys/sysmacros.h> if __GNU_LIBRARY__ is defined.
2519 * The tilegx*-*-linux-gnu configurations are no longer supported.
2521 * The obsolete function ustat is no longer available to newly linked
2522 binaries; the headers <ustat.h> and <sys/ustat.h> have been removed. This
2523 function has been deprecated in favor of fstatfs and statfs.
2525 * The obsolete function nfsservctl is no longer available to newly linked
2526 binaries. This function was specific to systems using the Linux kernel
2527 and could not usefully be used with the GNU C Library on systems with
2528 version 3.1 or later of the Linux kernel.
2530 * The obsolete function name llseek is no longer available to newly linked
2531 binaries. This function was specific to systems using the Linux kernel
2532 and was not declared in a header. Programs should use the lseek64 name
2533 for this function instead.
2535 * The AI_IDN_ALLOW_UNASSIGNED and NI_IDN_ALLOW_UNASSIGNED flags for the
2536 getaddrinfo and getnameinfo functions have been deprecated. The behavior
2537 previously selected by them is now always enabled.
2539 * The AI_IDN_USE_STD3_ASCII_RULES and NI_IDN_USE_STD3_ASCII_RULES flags for
2540 the getaddrinfo and getnameinfo functions have been deprecated. The STD3
2541 restriction (rejecting '_' in host names, among other things) has been
2542 removed, for increased compatibility with non-IDN name resolution.
2544 * The fcntl function now have a Long File Support variant named fcntl64. It
2545 is added to fix some Linux Open File Description (OFD) locks usage on non
2546 LFS mode. As for others *64 functions, fcntl64 semantics are analogous with
2547 fcntl and LFS support is handled transparently. Also for Linux, the OFD
2548 locks act as a cancellation entrypoint.
2550 * The obsolete functions encrypt, encrypt_r, setkey, setkey_r, cbc_crypt,
2551 ecb_crypt, and des_setparity are no longer available to newly linked
2552 binaries, and the headers <rpc/des_crypt.h> and <rpc/rpc_des.h> are no
2553 longer installed. These functions encrypted and decrypted data with the
2554 DES block cipher, which is no longer considered secure. Software that
2555 still uses these functions should switch to a modern cryptography library,
2558 * Reflecting the removal of the encrypt and setkey functions above, the
2559 macro _XOPEN_CRYPT is no longer defined. As a consequence, the crypt
2560 function is no longer declared unless _DEFAULT_SOURCE or _GNU_SOURCE is
2563 * The obsolete function fcrypt is no longer available to newly linked
2564 binaries. It was just another name for the standard function crypt,
2565 and it has not appeared in any header file in many years.
2567 * We have tentative plans to hand off maintenance of the passphrase-hashing
2568 library, libcrypt, to a separate development project that will, we hope,
2569 keep up better with new passphrase-hashing algorithms. We will continue
2570 to declare 'crypt' in <unistd.h>, and programs that use 'crypt' or
2571 'crypt_r' should not need to change at all; however, distributions will
2572 need to install <crypt.h> and libcrypt from a separate project.
2574 In this release, if the configure option --disable-crypt is used, glibc
2575 will not install <crypt.h> or libcrypt, making room for the separate
2576 project's versions of these files. The plan is to make this the default
2577 behavior in a future release.
2579 Changes to build and runtime requirements:
2581 GNU make 4.0 or later is now required to build glibc.
2583 Security related changes:
2585 CVE-2016-6261, CVE-2016-6263, CVE-2017-14062: Various vulnerabilities have
2586 been fixed by removing the glibc-internal IDNA implementation and using
2587 the system-provided libidn2 library instead. Originally reported by Hanno
2588 Böck and Christian Weisgerber.
2590 CVE-2017-18269: An SSE2-based memmove implementation for the i386
2591 architecture could corrupt memory. Reported by Max Horn.
2593 CVE-2018-11236: Very long pathname arguments to realpath function could
2594 result in an integer overflow and buffer overflow. Reported by Alexey
2597 CVE-2018-11237: The mempcpy implementation for the Intel Xeon Phi
2598 architecture could write beyond the target buffer, resulting in a buffer
2599 overflow. Reported by Andreas Schwab.
2601 The following bugs are resolved with this release:
2603 [1190] stdio: fgetc()/fread() behaviour is not POSIX compliant
2604 [6889] manual: 'PWD' mentioned but not specified
2605 [13575] libc: SSIZE_MAX defined as LONG_MAX is inconsistent with ssize_t,
2606 when __WORDSIZE != 64
2607 [13762] regex: re_search etc. should return -2 on memory exhaustion
2608 [13888] build: /tmp usage during testing
2609 [13932] math: dbl-64 pow unexpectedly slow for some inputs
2610 [14092] nptl: Support C11 threads
2611 [14095] localedata: Review / update collation data from Unicode / ISO
2613 [14508] libc: -Wformat warnings
2614 [14553] libc: Namespace pollution loff_t in sys/types.h
2615 [14890] libc: Make NT_PRFPREG canonical.
2616 [15105] libc: Extra PLT references with -Os
2617 [15512] libc: __bswap_constant_16 not compiled when -Werror -Wsign-
2619 [16335] manual: Feature test macro documentation incomplete and out of
2621 [16552] libc: Unify umount implementations in terms of umount2
2622 [17082] libc: htons et al.: statement-expressions prevent use on global
2623 scope with -O1 and higher
2624 [17343] libc: Signed integer overflow in /stdlib/random_r.c
2625 [17438] localedata: pt_BR: wrong d_fmt delimiter
2626 [17662] libc: please implement binding for the new renameat2 syscall
2627 [17721] libc: __restrict defined as /* Ignore */ even in c11
2628 [17979] libc: inconsistency between uchar.h and stdint.h
2629 [18018] dynamic-link: Additional $ORIGIN handling issues (CVE-2011-0536)
2630 [18023] libc: extend_alloca is broken (questionable pointer comparison,
2631 horrible machine code)
2632 [18124] libc: hppa: setcontext erroneously returns -1 as exit code for
2634 [18471] libc: llseek should be a compat symbol
2635 [18473] soft-fp: [powerpc-nofpu] __sqrtsf2, __sqrtdf2 should be compat
2637 [18991] nss: nss_files skips large entry in database
2638 [19239] libc: Including stdlib.h ends up with macros major and minor being
2640 [19463] libc: linknamespace failures when compiled with -Os
2641 [19485] localedata: csb_PL: Update month translations + add yesstr/nostr
2642 [19527] locale: Normalized charset name not recognized by setlocale
2643 [19667] string: Missing Sanity Check for malloc calls in file 'testcopy.c'
2644 [19668] libc: Missing Sanity Check for malloc() in file 'tst-setcontext-
2646 [19728] network: out of bounds stack read in libidn function
2647 idna_to_ascii_4i (CVE-2016-6261)
2648 [19729] network: out of bounds heap read on invalid utf-8 inputs in
2649 stringprep_utf8_nfkc_normalize (CVE-2016-6263)
2650 [19818] dynamic-link: Absolute (SHN_ABS) symbols incorrectly relocated by
2652 [20079] libc: Add SHT_X86_64_UNWIND to elf.h
2653 [20251] libc: 32bit programs pass garbage in struct flock for OFD locks
2654 [20419] dynamic-link: files with large allocated notes crash in
2656 [20530] libc: bswap_16 should use __builtin_bswap16() when available
2657 [20890] dynamic-link: ldconfig: fsync the files before atomic rename
2658 [20980] manual: CFLAGS environment variable replaces vital options
2659 [21163] regex: Assertion failure in pop_fail_stack when executing a
2660 malformed regexp (CVE-2015-8985)
2661 [21234] manual: use of CFLAGS makes glibc detect no optimization
2662 [21269] dynamic-link: i386 sigaction sa_restorer handling is wrong
2663 [21313] build: Compile Error GCC 5.4.0 MIPS with -0S
2664 [21314] build: Compile Error GCC 5.2.0 MIPS with -0s
2665 [21508] locale: intl/tst-gettext failure with latest msgfmt
2666 [21547] localedata: Tibetan script collation broken (Dzongkha and Tibetan)
2667 [21812] network: getifaddrs() returns entries with ifa_name == NULL
2668 [21895] libc: ppc64 setjmp/longjmp not fully interoperable with static
2670 [21942] dynamic-link: _dl_dst_substitute incorrectly handles $ORIGIN: with
2672 [22241] localedata: New locale: Yakut (Sakha) locale for Russia (sah_RU)
2673 [22247] network: Integer overflow in the decode_digit function in
2674 puny_decode.c in libidn (CVE-2017-14062)
2675 [22342] nscd: NSCD not properly caching netgroup
2676 [22391] nptl: Signal function clear NPTL internal symbols inconsistently
2677 [22550] localedata: es_ES locale (and other es_* locales): collation
2678 should treat ñ as a primary different character, sync the collation
2679 for Spanish with CLDR
2680 [22638] dynamic-link: sparc: static binaries are broken if glibc is built
2681 by gcc configured with --enable-default-pie
2682 [22639] time: year 2039 bug for localtime etc. on 64-bit platforms
2683 [22644] string: memmove-sse2-unaligned on 32bit x86 produces garbage when
2684 crossing 2GB threshold (CVE-2017-18269)
2685 [22646] localedata: redundant data (LC_TIME) for es_CL, es_CU, es_EC and
2687 [22735] time: Misleading typo in time.h source comment regarding
2689 [22753] libc: preadv2/pwritev2 fallback code should handle offset=-1
2690 [22761] libc: No trailing `%n' conversion specifier in FMT passed from
2691 `__assert_perror_fail ()' to `__assert_fail_base ()'
2692 [22766] libc: all glibc internal dlopen should use RTLD_NOW for robust
2694 [22786] libc: Stack buffer overflow in realpath() if input size is close
2695 to SSIZE_MAX (CVE-2018-11236)
2696 [22787] dynamic-link: _dl_check_caller returns false when libc is linked
2697 through an absolute DT_NEEDED path
2698 [22792] build: tcb-offsets.h dependency dropped
2699 [22797] libc: pkey_get() uses non-reserved name of argument
2700 [22807] libc: PTRACE_* constants missing for powerpc
2701 [22818] glob: posix/tst-glob_lstat_compat failure on alpha
2702 [22827] dynamic-link: RISC-V ELF64 parser mis-reads flag in ldconfig
2703 [22830] malloc: malloc_stats doesn't restore cancellation state on stderr
2704 [22848] localedata: ca_ES: update date definitions from CLDR
2705 [22862] build: _DEFAULT_SOURCE is defined even when _ISOC11_SOURCE is
2706 [22884] math: RISCV fmax/fmin handle signalling NANs incorrectly
2707 [22896] localedata: Update locale data for an_ES
2708 [22902] math: float128 test failures with GCC 8
2709 [22918] libc: multiple common of `__nss_shadow_database'
2710 [22919] libc: sparc32: backtrace yields infinite backtrace with
2712 [22926] libc: FTBFS on powerpcspe
2713 [22932] localedata: lt_LT: Update of abbreviated month names from CLDR
2715 [22937] localedata: Greek (el_GR, el_CY) locales actually need ab_alt_mon
2716 [22947] libc: FAIL: misc/tst-preadvwritev2
2717 [22963] localedata: cs_CZ: Add alternative month names
2718 [22987] math: [powerpc/sparc] fdim inlines errno, exceptions handling
2719 [22996] localedata: change LC_PAPER to en_US in es_BO locale
2720 [22998] dynamic-link: execstack tests are disabled when SELinux is
2722 [23005] network: Crash in __res_context_send after memory allocation
2724 [23007] math: strtod cannot handle -nan
2725 [23024] nss: getlogin_r is performing NSS lookups when loginid isn't set
2726 [23036] regex: regex equivalence class regression
2727 [23037] libc: initialize msg_flags to zero for sendmmsg() calls
2728 [23069] libc: sigaction broken on riscv64-linux-gnu
2729 [23094] localedata: hr_HR: wrong thousands_sep and mon_thousands_sep
2730 [23102] dynamic-link: Incorrect parsing of multiple consecutive $variable
2731 patterns in runpath entries (e.g. $ORIGIN$ORIGIN)
2732 [23137] nptl: s390: pthread_join sometimes block indefinitely (on 31bit
2733 and libc build with -Os)
2734 [23140] localedata: More languages need two forms of month names
2735 [23145] libc: _init/_fini aren't marked as hidden
2736 [23152] localedata: gd_GB: Fix typo in "May" (abbreviated)
2737 [23171] math: C++ iseqsig for long double converts arguments to double
2738 [23178] nscd: sudo will fail when it is run in concurrent with commands
2739 that changes /etc/passwd
2740 [23196] string: __mempcpy_avx512_no_vzeroupper mishandles large copies
2742 [23206] dynamic-link: static-pie + dlopen breaks debugger interaction
2743 [23208] localedata: New locale - Lower Sorbian (dsb)
2744 [23233] regex: Memory leak in build_charclass_op function in file
2746 [23236] stdio: Harden function pointers in _IO_str_fields
2747 [23250] nptl: Offset of __private_ss differs from GCC
2748 [23253] math: tgamma test suite failures on i686 with -march=x86-64
2749 -mtune=generic -mfpmath=sse
2750 [23259] dynamic-link: Unsubstituted ${ORIGIN} remains in DT_NEEDED for
2752 [23264] libc: posix_spawnp wrongly executes ENOEXEC in non compat mode
2753 [23266] nis: stringop-truncation warning with new gcc8.1 in nisplus-
2755 [23272] math: fma(INFINITY,INFIITY,0.0) should be INFINITY
2756 [23277] math: nan function should not have const attribute
2757 [23279] math: scanf and strtod wrong for some hex floating-point
2758 [23280] math: wscanf rounds wrong; wcstod is ok for negative numbers and
2760 [23290] localedata: IBM273 is not equivalent to ISO-8859-1
2761 [23303] build: undefined reference to symbol
2762 '__parse_hwcap_and_convert_at_platform@@GLIBC_2.23'
2763 [23307] dynamic-link: Absolute symbols whose value is zero ignored in
2765 [23313] stdio: libio vtables validation and standard file object
2767 [23329] libc: The __libc_freeres infrastructure is not properly run across
2769 [23349] libc: Various glibc headers no longer compatible with
2771 [23351] malloc: Remove unused code related to heap dumps and malloc
2773 [23363] stdio: stdio-common/tst-printf.c has non-free license
2774 [23396] regex: Regex equivalence regression in single-byte locales
2775 [23422] localedata: oc_FR: More updates of locale data
2776 [23442] build: New warning with GCC 8
2777 [23448] libc: Out of bounds access in IBM-1390 converter
2778 [23456] libc: Wrong index_cpu_LZCNT
2779 [23458] build: tst-get-cpu-features-static isn't added to tests
2780 [23459] libc: COMMON_CPUID_INDEX_80000001 isn't populated for Intel
2782 [23467] dynamic-link: x86/CET: A property note parser bug
2789 * The GNU C Library can now be compiled with support for building static
2790 PIE executables (See --enable-static-pie in INSTALL). These static PIE
2791 executables are like static executables but can be loaded at any address
2792 and provide additional security hardening benefits at the cost of some
2793 memory and performance. When the library is built with --enable-static-pie
2794 the resulting libc.a is usable with GCC 8 and above to create static PIE
2795 executables using the GCC option '-static-pie'. This feature is currently
2796 supported on i386, x86_64 and x32 with binutils 2.29 or later, and on
2797 aarch64 with binutils 2.30 or later.
2799 * Optimized x86-64 asin, atan2, exp, expf, log, pow, atan, sin, cosf,
2800 sinf, sincosf and tan with FMA, contributed by Arjan van de Ven and
2803 * Optimized x86-64 trunc and truncf for processors with SSE4.1.
2805 * Optimized generic expf, exp2f, logf, log2f, powf, sinf, cosf and sincosf.
2807 * In order to support faster and safer process termination the malloc API
2808 family of functions will no longer print a failure address and stack
2809 backtrace after detecting heap corruption. The goal is to minimize the
2810 amount of work done after corruption is detected and to avoid potential
2811 security issues in continued process execution. Reducing shutdown time
2812 leads to lower overall process restart latency, so there is benefit both
2813 from a security and performance perspective.
2815 * The abort function terminates the process immediately, without flushing
2816 stdio streams. Previous glibc versions used to flush streams, resulting
2817 in deadlocks and further data corruption. This change also affects
2818 process aborts as the result of assertion failures.
2820 * On platforms where long double has the IEEE binary128 format (aarch64,
2821 alpha, mips64, riscv, s390 and sparc), the math library now implements
2822 _Float128 interfaces for that type, as defined by ISO/IEC TS 18661-3:2015.
2823 These are the same interfaces added in version 2.26 for some platforms where
2824 this format is supported but is not the format of long double.
2826 * On platforms with support for _Float64x (aarch64, alpha, i386, ia64,
2827 mips64, powerpc64le, riscv, s390, sparc and x86_64), the math library now
2828 implements interfaces for that type, as defined by ISO/IEC TS
2829 18661-3:2015. These are corresponding interfaces to those supported for
2832 * The math library now implements interfaces for the _Float32, _Float64 and
2833 _Float32x types, as defined by ISO/IEC TS 18661-3:2015. These are
2834 corresponding interfaces to those supported for _Float128.
2836 * glibc now implements the memfd_create and mlock2 functions on Linux.
2838 * Support for memory protection keys was added. The <sys/mman.h> header now
2839 declares the functions pkey_alloc, pkey_free, pkey_mprotect, pkey_set,
2842 * The copy_file_range function was added.
2844 * Optimized memcpy, mempcpy, memmove, and memset for sparc M7.
2846 * The ldconfig utility now processes `include' directives using the C/POSIX
2847 collation ordering. Previous glibc versions used locale-specific
2848 ordering, the change might break systems that relied on that.
2850 * Support for two grammatical forms of month names has been added.
2851 In a call to strftime, the "%B" and "%b" format specifiers will now
2852 produce the grammatical form required when the month is used as part
2853 of a complete date. New "%OB" and "%Ob" specifiers produce the form
2854 required when the month is named by itself. For instance, in Greek
2855 and in many Slavic and Baltic languages, "%B" will produce the month
2856 in genitive case, and "%OB" will produce the month in nominative case.
2858 In a call to strptime, "%B", "%b", "%h", "%OB", "%Ob", and "%Oh"
2859 are all valid and will all accept any known form of month
2860 name---standalone or complete, abbreviated or full. In a call to
2861 nl_langinfo, the query constants MON_1..12 and ABMON_1..12 return
2862 the strings used by "%B" and "%b", respectively. New query
2863 constants ALTMON_1..12 and _NL_ABALTMON_1..12 return the strings
2864 used by "%OB" and "%Ob", respectively.
2866 In a locale definition file, use "alt_mon" and "ab_alt_mon" to
2867 define the strings for %OB and %Ob, respectively; these have the
2868 same syntax as "mon" and "abmon". These arrays are optional; if they
2869 are not provided then they have the same content as "mon" and "abmon",
2872 These features are provided for locales which define "alt_mon" and/or
2873 "ab_alt_mon" in their locale source data. This release includes such
2874 alternative month name data for the following languages: Belarusian,
2875 Croatian, Greek, Lithuanian, Polish, Russian, and Ukrainian.
2877 This feature is currently a GNU extension, but it is expected to
2878 be added to the next revision of POSIX, and it is also already
2879 available on some BSD-derived operating systems.
2881 This feature will cause existing statically compiled applications
2882 to fail to load locales and fall back to the builtin C/POSIX locales.
2883 See notes below for other changes affecting compatibility.
2885 * Support for the RISC-V ISA running on Linux has been added. This port
2886 requires at least binutils-2.30, gcc-7.3.0, and linux-4.15; and is supported
2887 for the following ISA and ABI pairs:
2893 Deprecated and removed features, and other changes affecting compatibility:
2895 * Statically compiled applications attempting to load locales compiled for the
2896 GNU C Library version 2.27 will fail and fall back to the builtin C/POSIX
2897 locale. The reason for this is that the addition of the new "%OB" and "%Ob",
2898 support for two grammatical forms of the month names, also extends the locale
2899 data binary format. Static applications needing locale support must be
2900 recompiled to match the runtime and data they are deployed with. In some
2901 distributions there is an upgrade window where dynamically linked applications
2902 may use a new library but the old locale data and also fall back to the
2903 builtin C/POSIX locales; restarting the application process is sufficient to
2906 * Support for statically linked applications which call dlopen is deprecated
2907 and will be removed in a future version of glibc. Applications which call
2908 dlopen need to be linked dynamically instead.
2910 * Support for old programs which use internal stdio data structures and
2911 functions is deprecated. This includes programs which use the C++ streams
2912 provided by libstdc++ in GCC 2.95. Programs which use the internal
2913 symbols _IO_adjust_wcolumn, _IO_default_doallocate, _IO_default_finish,
2914 _IO_default_pbackfail, _IO_default_uflow, _IO_default_xsgetn,
2915 _IO_default_xsputn, _IO_doallocbuf, _IO_do_write, _IO_file_attach,
2916 _IO_file_close, _IO_file_close_it, _IO_file_doallocate, _IO_file_fopen,
2917 _IO_file_init, _IO_file_jumps, _IO_fileno, _IO_file_open,
2918 _IO_file_overflow, _IO_file_read, _IO_file_seek, _IO_file_seekoff,
2919 _IO_file_setbuf, _IO_file_stat, _IO_file_sync, _IO_file_underflow,
2920 _IO_file_write, _IO_file_xsputn, _IO_flockfile, _IO_flush_all,
2921 _IO_flush_all_linebuffered, _IO_free_backup_area, _IO_free_wbackup_area,
2922 _IO_init, _IO_init_marker, _IO_init_wmarker, _IO_iter_begin, _IO_iter_end,
2923 _IO_iter_file, _IO_iter_next, _IO_least_wmarker, _IO_link_in,
2924 _IO_list_all, _IO_list_lock, _IO_list_resetlock, _IO_list_unlock,
2925 _IO_marker_delta, _IO_marker_difference, _IO_remove_marker, _IO_seekmark,
2926 _IO_seekwmark, _IO_str_init_readonly, _IO_str_init_static,
2927 _IO_str_overflow, _IO_str_pbackfail, _IO_str_seekoff, _IO_str_underflow,
2928 _IO_switch_to_main_wget_area, _IO_switch_to_wget_mode,
2929 _IO_unsave_wmarkers, _IO_wdefault_doallocate, _IO_wdefault_finish,
2930 _IO_wdefault_pbackfail, _IO_wdefault_setbuf, _IO_wdefault_uflow,
2931 _IO_wdefault_xsgetn, _IO_wdefault_xsputn, _IO_wdoallocbuf, _IO_wdo_write,
2932 _IO_wfile_jumps, _IO_wfile_overflow, _IO_wfile_sync, _IO_wfile_underflow,
2933 _IO_wfile_xsputn, _IO_wmarker_delta, or _IO_wsetb may stop working with a
2934 future version of glibc. Unlike other symbol removals, these old
2935 applications will not be supported using compatibility symbols.
2937 * On GNU/Linux, the obsolete Linux constant PTRACE_SEIZE_DEVEL is no longer
2938 defined by <sys/ptrace.h>.
2940 * libm no longer supports SVID error handling (calling a user-provided
2941 matherr function on error) or the _LIB_VERSION variable to control error
2942 handling. (SVID error handling and the _LIB_VERSION variable still work
2943 for binaries linked against older versions of the GNU C Library.) The
2944 libieee.a library is no longer provided. math.h no longer defines struct
2945 exception, or the macros X_TLOSS, DOMAIN, SING, OVERFLOW, UNDERFLOW,
2946 TLOSS, PLOSS and HUGE.
2948 * The libm functions pow10, pow10f and pow10l are no longer supported for
2949 new programs. Programs should use the standard names exp10, exp10f and
2950 exp10l for these functions instead.
2952 * The mcontext_t type is no longer the same as struct sigcontext. On
2953 platforms where it was previously the same, this changes the C++ name
2954 mangling for interfaces involving this type.
2956 * The add-ons mechanism for building additional packages at the same time as
2957 glibc has been removed. The --enable-add-ons configure option is now
2960 * The --without-fp configure option is now ignored. Whether hardware
2961 floating-point instructions are used is now configured based on whether
2962 the compiler used at configure time (without any options implied by a
2963 --with-cpu= configure option) uses such instructions.
2965 * The res_hnok, res_dnok, res_mailok and res_ownok functions now check that
2966 the specified string can be parsed as a domain name.
2968 * In the malloc_info output, the <heap> element may contain another <aspace>
2969 element, "subheaps", which contains the number of sub-heaps.
2971 * The libresolv function p_secstodate is no longer supported for new
2974 * The tilepro-*-linux-gnu configuration is no longer supported.
2976 * The nonstandard header files <libio.h> and <_G_config.h> are deprecated
2977 and will be removed in a future release. Software that is still using
2978 either header should be updated to use standard <stdio.h> interfaces
2981 libio.h was originally the header for a set of supported GNU extensions,
2982 but they have not been maintained as such in many years, they are now
2983 standing in the way of improvements to stdio, and we don't think there are
2984 any remaining external users. _G_config.h was never intended for public
2985 use, but predates the bits convention.
2987 Changes to build and runtime requirements:
2989 * bison version 2.7 or later is required to generate code in the 'intl'
2992 Security related changes:
2994 CVE-2009-5064: The ldd script would sometimes run the program under
2995 examination directly, without preventing code execution through the
2996 dynamic linker. (The glibc project disputes that this is a security
2997 vulnerability; only trusted binaries must be examined using the ldd
3000 CVE-2017-15670: The glob function, when invoked with GLOB_TILDE,
3001 suffered from a one-byte overflow during ~ operator processing (either
3002 on the stack or the heap, depending on the length of the user name).
3003 Reported by Tim Rühsen.
3005 CVE-2017-15671: The glob function, when invoked with GLOB_TILDE,
3006 would sometimes fail to free memory allocated during ~ operator
3007 processing, leading to a memory leak and, potentially, to a denial
3010 CVE-2017-15804: The glob function, when invoked with GLOB_TILDE and
3011 without GLOB_NOESCAPE, could write past the end of a buffer while
3012 unescaping user names. Reported by Tim Rühsen.
3014 CVE-2017-17426: The malloc function, when called with an object size near
3015 the value SIZE_MAX, would return a pointer to a buffer which is too small,
3016 instead of NULL. This was a regression introduced with the new malloc
3017 thread cache in glibc 2.26. Reported by Iain Buclaw.
3019 CVE-2017-1000408: Incorrect array size computation in _dl_init_paths leads
3020 to the allocation of too much memory. (This is not a security bug per se,
3021 it is mentioned here only because of the CVE assignment.) Reported by
3024 CVE-2017-1000409: Buffer overflow in _dl_init_paths due to miscomputation
3025 of the number of search path components. (This is not a security
3026 vulnerability per se because no trust boundary is crossed if the fix for
3027 CVE-2017-1000366 has been applied, but it is mentioned here only because
3028 of the CVE assignment.) Reported by Qualys.
3030 CVE-2017-16997: Incorrect handling of RPATH or RUNPATH containing $ORIGIN
3031 for AT_SECURE or SUID binaries could be used to load libraries from the
3034 CVE-2018-1000001: Buffer underflow in realpath function when getcwd function
3035 succeeds without returning an absolute path due to unexpected behaviour
3036 of the Linux kernel getcwd syscall. Reported by halfdog.
3038 CVE-2018-6485: The posix_memalign and memalign functions, when called with
3039 an object size near the value of SIZE_MAX, would return a pointer to a
3040 buffer which is too small, instead of NULL. Reported by Jakub Wilk.
3042 CVE-2018-6551: The malloc function, when called with an object size near
3043 the value of SIZE_MAX, would return a pointer to a buffer which is too
3044 small, instead of NULL.
3046 The following bugs are resolved with this release:
3048 [866] glob: glob should match dangling symlinks
3049 [1062] glob: sysdeps/generic/glob.c merge from gnulib (part 3 of 3)
3050 [2522] localedata: ca_ES@valencia: new Valencian (meridional Catalan)
3052 [5997] math: Very slow execution of sinf function
3053 [10580] localedata: hr_HR: updated locale
3054 [10871] locale: 'mon' array should contain both nominative and genitive
3056 [12349] localedata: eu_ES: incorrect thousands separator
3057 [13605] localedata: shn_MM: new Shan locale
3058 [13805] localedata: ru_RU: currency should use ',' as radix point
3059 [13953] localedata: km_KH: locale update
3060 [13994] localedata: mjw_IN: new locale
3061 [14121] build: make writes .mo files in po directory
3062 [14333] libc: Fix the race between atexit() and exit()
3063 [14681] dynamic-link: _dl_get_origin leaks memory via executable link map.
3064 [14925] localedata: bn_*: LC_IDENTIFICATION.language key should be
3066 [15260] localedata: LC_MESSAGES.{yes,no}{str,expr}: various errors
3067 [15261] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of full-
3068 width Latin characters
3069 [15332] localedata: es_CU: locale update
3070 [15436] stdio: Don't close or flush stdio streams on abort
3071 [15537] localedata: lv_LV: invalid collation for Latvian diacritical
3073 [16148] localedata: ca_ES: incorrect thousands separator
3074 [16750] dynamic-link: ldd should not try to execute the binaries
3076 [16777] localedata: pl_PL: incorrect thousands separator in locale
3077 [16905] localedata: hanzi: new collation
3078 [17563] localedata: cmn_TW: add hanzi collation
3079 [17750] localedata: wrong collation order of diacritics in most locales
3080 [17804] libc: scandirat fails with ENOMEM because it checks for errno even
3082 [17956] build: Build fails on missing definitions from header file
3083 nss/nss.h when Mozilla NSS is used for cryptography
3084 [18203] libc: realpath() does not handle unreachable paths correctly
3085 [18572] dynamic-link: [arm] Lazy TLSDESC relocation has data race
3086 [18812] localedata: kab_DZ: new Kabyle Algeria locale
3087 [18822] libc: Internal functions are called via PLT
3088 [18858] string: _HAVE_STRING_ARCH_xxx aren't defined for i386 nor x86_64
3089 [19170] libc: __gmon_start__ defined in hppa in crtn.S
3090 [19574] libc: glibc should support building static PIE binaries
3091 [19852] localedata: charmaps/UTF-8: incorrect wcwidth for U+3099 and
3093 [19971] glob: glob: Do not skip entries with zero d_ino values
3094 [19982] localedata: fr.po: spelling mistake for error code EXDEV
3095 [20008] localedata: km_KH: convert to translit_neutral
3096 [20009] localedata: tr_TR: convert LC_CTYPE to i18n
3097 [20142] math: [x86_64] Add SSE4.1 trunc, truncf
3098 [20204] dynamic-link: _dl_open_hook and _dlfcn_hook hardening
3099 [20482] localedata: de_CH: abbreviated weekdays should be two letters
3100 [20498] localedata: miq_NI: new Mískitu / Miskito (miq) language locale
3102 [20532] nss: getaddrinfo uses errno and h_errno without guaranteeing
3103 they're set, wrong errors returned by gaih_inet when lookup functions
3105 [20756] localedata: [PATCH] Use Unicode wise thousands separator
3106 [20826] network: posix/tst-getaddrinfo5 fails on hosts without network
3108 [20952] localedata: yuw_PG: new locale
3109 [21084] localedata: charmaps/IBM858: new codepage
3110 [21161] manual: [PATCH] fix typo in manual/arith.texi on strtoul prototype
3111 [21242] libc: assert gives pedantic warning in old gcc versions
3112 [21265] dynamic-link: _dl_runtime_resolve isn't compatible with Intel C++
3113 __regcall calling convention
3114 [21309] math: signed integer overflow in sysdeps/ieee754/dbl-64/e_pow.c
3115 [21326] libc: C99 functions are not declared for C++11 and later if
3116 _GNU_SOURCE is not predefined by g++
3117 [21457] libc: sys/ucontext.h namespace
3118 [21530] libc: tmpfile() should be implemented using O_TMPFILE
3119 [21660] math: GCC fails to compile a formula with tgmath.h
3120 [21672] nptl: sys-libs/glibc on ia64 crashes on thread exit: signal
3121 SIGSEGV, Segmentation fault: pthread_create.c:432: __madvise
3122 (pd->stackblock, freesize - PTHREAD_STACK_MIN, MADV_DONTNEED);
3123 [21684] math: tgmath.h handling of complex integers
3124 [21685] math: tgmath.h handling of bit-fields
3125 [21686] math: tgmath.h handling of __int128
3126 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
3128 [21745] libc: [powerpc64le] Extra PLT reference with --enable-stack-
3130 [21750] localedata: column width of characters incompatible with classical
3132 [21754] malloc: malloc: Perform as little work as possible after heap
3133 consistency check failures
3134 [21780] libc: hppa: p{read,write}v2 does not set ENOSUP on invalid flag
3135 [21790] libc: Missing __memset_zero_constant_len_parameter in libc.so
3136 [21791] string: Unused XXX_chk_XXX functions in libc.a
3137 [21815] dynamic-link: FAIL: elf/tst-prelink-cmp with GCC is defaulted to
3139 [21836] localedata: Removed redundant data (LC_MONETARY) in various Indian
3141 [21845] localedata: Added new Locale bho_NP
3142 [21853] localedata: Fix abday Which looks same as day in zh_SG
3143 [21854] localedata: Added New Locale en_SC
3144 [21864] libc: xmalloc.o is compiled with -DMODULE_NAME=libc
3145 [21871] dynamic-link: _dl_runtime_resolve_avx_opt is slower than
3146 _dl_runtime_resolve_avx_slow
3147 [21885] network: getaddrinfo: gethosts does not release resolver context
3148 on memory allocation failure
3149 [21899] libc: XPG4.2 sigaction namespace
3150 [21908] dynamic-link: dynamic linker broke on ia64 (mmap2 consolidation is
3152 [21913] libc: static binaries SIGSEGV in __brk when host's gcc is pie-by-
3154 [21915] nss: nss_files can return with NSS_STATUS_SUCCESS and a clobbered
3155 errno value, causing getaddrinfo to fail
3156 [21920] localedata: Fix p_cs_precedes/n_cs_precedes for mt_MT
3157 [21922] network: getaddrinfo with AF_INET/AF_INET6 returns EAI_NONAME
3158 instead of EAI_NODATA
3159 [21928] libc: sys/ptrace.h: remove obsolete temporary development Linux
3160 constant PTRACE_SEIZE_DEVEL
3161 [21930] math: C-only gcc builtins used in <math.h> isinf
3162 [21932] network: Unpaired __resolv_context_get in generic get*_r
3164 [21941] math: powerpc: Wrong register constraint for xssqrtqp in sqrtf128
3165 [21944] libc: sigval namespace
3166 [21951] localedata: Update hanzi collation by stroke
3167 [21955] math: Wrong alignment of L(SP_RANGE)/L(SP_INF_0) in
3168 sysdeps/x86_64/fpu/e_expf.S
3169 [21956] libc: Stack allocation in MIPS syscall impl (ubounded stack
3170 allocation in syscall loops)
3171 [21959] localedata: Fix Country name for xh_ZA
3172 [21960] localedata: Fix abmon for bem_ZM
3173 [21966] math: AVX2 mathvec functions use FMA without checking
3174 [21967] math: When 512-bit AVX2 wrapper functions in mathvec are used?
3175 [21971] localedata: Added New Locale for mfe_MU
3176 [21972] libc: assert macro requires operator== (int) for its argument type
3177 [21973] math: [sparc] libm missing sqrtl compat symbol
3178 [21974] libc: Remove __bb_init_func and __bb_exit_func
3179 [21982] string: stratcliff.c: error: assuming signed overflow does not
3181 [21986] stdio: __guess_grouping is called incorrectly
3182 [21987] math: [sparc32] wrong bits/long-double.h installed
3183 [22019] localedata: Wrong placement of monetary symbol in el_GR (negative
3185 [22022] localedata: Missing country_name for mni_IN
3186 [22023] localedata: Removed redundant data (LC_TIME and LC_MESSAGES) for
3188 [22025] locale: iconv: Inconsistency between pointer mangling and NULL
3190 [22026] locale: iconv_open: heap overflow on gconv_init failure
3191 [22028] math: bits/math-finite.h _MSUF_ expansion namespace
3192 [22035] math: [m68k] bits/math-inline.h macro namespace
3193 [22038] localedata: Fix abbreviated weeks and months for Somali
3194 [22044] localedata: Remove redundant data for Limburgish Language
3195 [22050] malloc: Linking with -lmcheck does not hook
3196 __malloc_initialize_hook correctly
3197 [22051] libc: zero terminator in the middle of glibc's .eh_frame
3198 [22052] malloc: malloc failed to compile with GCC 7 and -O3
3199 [22070] localedata: charmaps/UTF-8: wcwidth for
3200 Prepended_Concatenation_Mark codepoints set to 0 (should be 1)
3201 [22074] localedata: charmaps/UTF-8: wcwidth for U+1160-U+11FF (Hangul
3202 Jungseong and Jongseong) should be 0
3203 [22078] nss: nss_files performance issue in multi mode
3204 [22082] math: bits/math-finite.h exp10 condition
3205 [22086] libc: pcprofiledump incorrect cross-endian condition
3206 [22093] dynamic-link: ld.so no longer searches in .../x86_64
3207 [22095] network: Name server address allocation memory leak in resolv.conf
3209 [22096] network: __resolv_conf_attach can incorrectly free passed conf
3211 [22100] localedata: om_KE: LC_TIME: copy redundant data from om_ET
3212 [22101] dynamic-link: Dynamic loader must ignore "debug" shared objects
3214 [22111] malloc: malloc: per thread cache is not returned when thread exits
3215 [22112] localedata: Fix LC_TELEPHONE/LC_NAME for az_AZ
3216 [22134] libc: [linux] implement fexecve with execveat
3217 [22142] libc: [powerpc] printf outputs a wrong value of DBL_MAX on ppc64 and
3219 [22145] libc: ttyname() gives up too early in the face of namespaces
3220 [22146] math: C++ build issue with float128 on x86_64
3221 [22153] nptl: nptl: save error code before process termination
3222 [22156] libc: [hppa,ia64,microblaze] Executable stack default
3223 [22159] malloc: malloc: MALLOC_CHECK_ broken with --enable-tunables=no
3224 [22161] nscd: nscd cache prune for netgroups hangs after timeout bump
3225 [22165] libc: [hppa] Text relocations in libc.so
3226 [22180] libc: destructor registered via __cxa_atexit is called twice
3227 [22183] glob: commit 5554304f0ddd ("posix: Allow glob to match dangling
3228 symlinks") cause "make" segfaults
3229 [22189] math: [powerpc] math_private.h definitions of math_opt_barrier and
3231 [22207] libc: FAIL: stdlib/test-atexit-race
3232 [22225] math: nearbyint arithmetic moved before feholdexcept
3233 [22229] math: [sparc32] missing copysignl, fabsl, fmal compat symbols
3234 [22235] math: iscanonical in C++ and float128
3235 [22243] math: log2(0) and log10(0) are wrong in downward rounding without
3236 the svid compat wrapper
3237 [22244] math: ynf and yn are wrong without the svid compat wrapper
3238 [22273] libc: Improper assert in Linux posix_spawn implementation
3239 [22284] libc: -pg -pie doesn't work
3240 [22292] locale: localedef exits with error 4 when it should be error 1
3241 [22294] locale: Allow "" for int_currency_symbol definition in locales.
3242 [22295] locale: Don't warn on non-symbolic characters in locale sources in
3244 [22296] math: glibc 2.26: signbit build issue with Gcc 5.5.0 on x86_64
3245 [22298] nptl: x32: lockups on recursive pthread_mutex_lock after upgrade
3247 [22299] dynamic-link: Problem with $PLATFORM on x86_64 platform
3248 [22320] glob: Buffer overflow in glob with GLOB_TILDE (CVE-2017-15670)
3249 [22321] libc: sysconf(_SC_IOV_MAX) returns -1 on Linux
3250 [22322] libc: [mips64] wrong bits/long-double.h installed
3251 [22325] glob: Memory leak in glob with GLOB_TILDE (CVE-2017-15671)
3252 [22332] glob: Buffer overflow in glob with GLOB_TILDE in unescaping
3254 [22336] localedata: cs_CZ LC_COLLATE does not use i18n
3255 [22343] malloc: Integer overflow in posix_memalign
3256 [22347] libc: getrandom() returns the number of bytes that were copied to
3257 the buffer even though the comments say "Return 0 on success and -1 on
3259 [22353] string: sysdeps/i386/i586/strcpy.S isn't maintainable
3260 [22362] libc: Installed crt1.o, crti,.o and crtn.o files are used with
3262 [22370] dynamic-link: Incorrect note padding check
3263 [22375] libc: malloc returns pointer from tcache_get when should return
3264 NULL (CVE-2017-17426)
3265 [22377] math: iseqsig, float128 and C++
3266 [22382] localedata: Error in tpi_PG locale
3267 [22387] localedata: Replace unicode sequences <Uxxxx> for characters
3268 inside the ASCII printable range
3269 [22402] math: [powerpc64le] __MATH_TG does not support _Float128 for
3271 [22403] localedata: Slash needs escaping in some locales
3272 [22408] malloc: malloc_info access heaps without arena lock, ignores heaps
3273 [22409] network: res_hnok does not accept some host names used on the
3275 [22412] network: res_dnok, res_hnok should perform syntax checks
3276 [22413] network: ns_name_pton ignores syntactically invalid trailing
3278 [22415] stdio: setvbuf can lead to invalid free/segfault
3279 [22432] build: Non-deterministic build
3280 [22439] malloc: malloc_info should compute summary statistics for all sub-
3282 [22442] network: if_nametoindex could report index for the wrong
3283 networking interface
3284 [22446] build: aliasing violation calling readlink in handle_request
3285 [22447] build: unsafe call to strlen with a non-string in getlogin_r.c
3286 [22457] libc: Generic preadv/pwritev incorrectly calls __posix_memalign
3287 [22459] libc: FAIL: elf/check-localplt with __stack_chk_fail related to
3288 __nscd_hash/__nss_hash
3289 [22463] network: p_secstodate overflow handling
3290 [22469] localedata: pl_PL LC_COLLATE does not use i18n
3291 [22478] libc: sigwait can fail with EINTR
3292 [22505] libc: ldconfig processes include directive in locale-specific
3294 [22515] localedata: hsb_DE LC_COLLATE does not use copy "iso14651_t1"
3295 [22517] localedata: et_EE LC_COLLATE does not use copy "iso14651_t1"
3296 [22519] localedata: is_IS LC_COLLATE does not use copy "iso14651_t1"
3297 [22524] localedata: lt_LT LC_COLLATE does not use copy "iso14651_t1"
3298 [22527] localedata: tr_TR LC_COLLATE does not use copy "iso14651_t1"
3299 [22534] localedata: Collation rules for Serbian and Bosnian should be the
3300 same as for Croatian
3301 [22561] math: [DR#471] cacosh (0 + iNaN) should return NaN +/- i pi/2
3302 [22568] math: [DR#471] ctanh (0 + iNaN), ctanh (0 + i Inf)
3303 [22577] libc: missing newline after "cannot allocate TLS data structures
3305 [22588] manual: manual/conf.texi: missing underscore in front of
3307 [22593] math: nextafter and nexttoward are declared with const attribute
3308 [22596] manual: manual: finite(nan) wrongly described as returning nonzero
3309 [22603] string: ia64 memchr overflows internal pointer check
3310 [22605] libc: SH clone does not set the exit code correctly
3311 [22606] dynamic-link: Incorrect array size computation in _dl_init_paths
3313 [22607] dynamic-link: Buffer Overflow in _dl_init_paths (CVE-2017-1000409)
3314 [22611] malloc: malloc/tst-realloc wrongly assumes that errno must not be
3315 modified in case of success
3316 [22614] build: gcc: error: unrecognized command line option ‘-no-pie’
3317 [22615] manual: manual: ambiguous wording about errno value in case of
3319 [22624] libc: MIPS setjmp() saves incorrect 'o0' register in --enable-
3321 [22625] dynamic-link: RPATH $ORIGIN replaced by PWD for AT_SECURE/SUID
3322 binaries or if /proc is not mounted (CVE-2017-16997)
3323 [22627] dynamic-link: $ORIGIN in $LD_LIBRARY_PATH is substituted twice
3324 [22630] build: $(no-pie-ldflag) is no longer effective
3325 [22631] math: [m68k] Bad const attributes in bits/mathinline.h
3326 [22635] nptl: pthread_self returns NULL before libpthread is loaded
3327 [22636] nptl: PTHREAD_STACK_MIN is too small on x86-64
3328 [22637] nptl: guard size is subtracted from thread stack size instead of
3330 [22648] libc: getrlimit/setrlimit with RLIM_INFINITY broken on alpha
3331 [22657] localedata: hu_HU: Avoid double space in date
3332 [22660] math: fmax, fmin sNaN handling on alpha
3333 [22664] libc: New warning of GCC8
3334 [22665] math: alpha: ceil and floor raise inexact exceptions
3335 [22666] math: alpha: trunc raise inexact exceptions
3336 [22667] libc: makecontext lacks stack alignment on i386
3337 [22678] libc: prlimit fails for RLIM_INFINITY values on 32-bit machines
3338 [22679] libc: getcwd(3) can succeed without returning an absolute path
3340 [22685] libc: PowerPC: Static AT_SECURE binaries segfault with lock-
3341 elision and tunables
3342 [22687] math: [powerpc-nofpu] complex long double functions spurious
3344 [22688] math: [powerpc-nofpu] remainderl wrong sign of zero result
3345 [22690] math: [ldbl-128ibm] lrintl, lroundl missing "invalid" exceptions
3346 [22691] math: [powerpc-nofpu] fmaxmagl, fminmagl spurious "invalid"
3348 [22693] math: [ldbl-128ibm] log1pl (-qNaN) spurious "invalid" exception
3349 [22697] math: [powerpc] llround spurious "inexact" exceptions on 32-bit
3351 [22701] nis: Incomplete removal of libnsl
3352 [22702] math: [powerpc-nofpu] nearbyintl traps with trapping "inexact"
3353 [22707] libc: Missing defines in elf.h for DF_1_STUB and DF_1_PIE.
3354 [22715] dynamic-link: FAIL: elf/tst-audit10
3355 [22719] libc: Backtrace tests fail on hppa
3356 [22742] libc: [aarch64] mcontext_t __reserved field got renamed
3357 [22743] nptl: __pthread_register_cancel corrupts stack after f81ddabffd
3358 [22765] crypt: (struct crypt_data *data)->initialized is not set to zero
3359 before the first call to crypt_r () in crypt/badsalttest.c
3366 * A per-thread cache has been added to malloc. Access to the cache requires
3367 no locks and therefore significantly accelerates the fast path to allocate
3368 and free small amounts of memory. Refilling an empty cache requires locking
3369 the underlying arena. Performance measurements show significant gains in a
3370 wide variety of user workloads. Workloads were captured using a special
3371 instrumented malloc and analyzed with a malloc simulator. Contributed by
3372 DJ Delorie with the help of Florian Weimer, and Carlos O'Donell.
3374 * Unicode 10.0.0 Support: Character encoding, character type info, and
3375 transliteration tables are all updated to Unicode 10.0.0, using
3376 generator scripts contributed by Mike FABIAN (Red Hat).
3377 These updates cause user visible changes, especially the changes in
3378 wcwidth for many emoji characters cause problems when emoji sequences
3379 are rendered with pango, see for example:
3380 https://bugzilla.gnome.org/show_bug.cgi?id=780669#c5
3382 * Collation of Hungarian has been overhauled and is now consistent with "The
3383 Rules of Hungarian Orthography, 12th edition" (Bug 18934). Contributed by
3386 * Improvements to the DNS stub resolver, contributed by Florian Weimer:
3388 - The GNU C Library will now detect when /etc/resolv.conf has been
3389 modified and reload the changed configuration. The new resolver option
3390 “no-reload” (RES_NORELOAD) disables this behavior.
3392 - The GNU C Library now supports an arbitrary number of search domains
3393 (configured using the “search” directive in /etc/resolv.conf);
3394 previously, there was a hard limit of six domains. For backward
3395 compatibility, applications that directly modify the ‘_res’ global
3396 object are still limited to six search domains.
3398 - When the “rotate” (RES_ROTATE) resolver option is active, the GNU C
3399 Library will now randomly pick a name server from the configuration as a
3400 starting point. (Previously, the second name server was always used.)
3402 * The tunables feature is now enabled by default. This allows users to tweak
3403 behavior of the GNU C Library using the GLIBC_TUNABLES environment variable.
3405 * New function reallocarray, which resizes an allocated block (like realloc)
3406 to the product of two sizes, with a guaranteed clean failure upon integer
3407 overflow in the multiplication. Originally from OpenBSD, contributed by
3408 Dennis Wölfing and Rüdiger Sonderfeld.
3410 * New wrappers for the Linux-specific system calls preadv2 and pwritev2.
3411 These are extended versions of preadv and pwritev, respectively, taking an
3412 additional flags argument. The set of supported flags depends on the
3413 running kernel; full support currently requires kernel 4.7 or later.
3415 * posix_spawnattr_setflags now supports the flag POSIX_SPAWN_SETSID, to
3416 create a new session ID for the spawned process. This feature is
3417 scheduled to be added to the next major revision of POSIX; for the time
3418 being, it is available under _GNU_SOURCE.
3420 * errno.h is now safe to use from C-preprocessed assembly language on all
3421 supported operating systems. In this context, it will only define the
3422 Exxxx constants, as preprocessor macros expanding to integer literals.
3424 * On ia64, powerpc64le, x86-32, and x86-64, the math library now implements
3425 128-bit floating point as defined by ISO/IEC/IEEE 60559:2011 (IEEE
3426 754-2008) and ISO/IEC TS 18661-3:2015. Contributed by Paul E. Murphy,
3427 Gabriel F. T. Gomes, Tulio Magno Quites Machado Filho, and Joseph Myers.
3429 To compile programs that use this feature, the compiler must support
3430 128-bit floating point with the type name _Float128 (as defined by TS
3431 18661-3) or __float128 (the nonstandard name used by GCC for C++, and for
3432 C prior to version 7). _GNU_SOURCE or __STDC_WANT_IEC_60559_TYPES_EXT__
3433 must be defined to make the new interfaces visible.
3435 The new functions and macros correspond to those present for other
3436 floating-point types (except for a few obsolescent interfaces not
3437 supported for the new type), with F128 or f128 suffixes; for example,
3438 strtof128, HUGE_VAL_F128 and cosf128. Following TS 18661-3, there are no
3439 printf or scanf formats for the new type; the strfromf128 and strtof128
3440 interfaces should be used instead.
3442 Deprecated and removed features, and other changes affecting compatibility:
3444 * The synchronization that pthread_spin_unlock performs has been changed to
3445 now be equivalent to a C11 atomic store with release memory order to the
3446 spin lock's memory location. Previously, several (but not all)
3447 architectures used stronger synchronization (e.g., containing what is
3448 often called a full barrier). This change can improve performance, but
3449 may affect odd fringe uses of spin locks that depend on the previous
3450 behavior (e.g., using spin locks as atomic variables to try to implement
3451 Dekker's mutual exclusion algorithm).
3453 * The port to Native Client running on ARMv7-A (--host=arm-nacl) has been
3456 * Sun RPC is deprecated. The rpcgen program, librpcsvc, and Sun RPC headers
3457 will only be built and installed when the GNU C Library is configured with
3458 --enable-obsolete-rpc. This allows alternative RPC implementations, such
3459 as TIRPC or rpcsvc-proto, to be used.
3461 * The NIS(+) name service modules, libnss_nis, libnss_nisplus, and
3462 libnss_compat, are deprecated, and will not be built or installed by
3465 The NIS(+) support library, libnsl, is also deprecated. By default, a
3466 compatibility shared library will be built and installed, but not headers
3467 or development libraries. Only a few NIS-related programs require this
3468 library. (In particular, the GNU C Library has never required programs
3469 that use 'gethostbyname' to be linked with libnsl.)
3471 Replacement implementations based on TIRPC, which additionally support
3472 IPv6, are available from <https://github.com/thkukuk/>. The configure
3473 option --enable-obsolete-nsl will cause libnsl's headers, and the NIS(+)
3474 name service modules, to be built and installed.
3476 * The DNS stub resolver no longer performs EDNS fallback. If EDNS or DNSSEC
3477 support is enabled, the configured recursive resolver must support EDNS.
3478 (Responding to EDNS-enabled queries with responses which are not
3479 EDNS-enabled is fine, but FORMERR responses are not.)
3481 * res_mkquery and res_nmkquery no longer support the IQUERY opcode. DNS
3482 servers have not supported this opcode for a long time.
3484 * The _res_opcodes variable has been removed from libresolv. It had been
3485 exported by accident.
3487 * <string.h> no longer includes inline versions of any string functions,
3488 as this kind of optimization is better done by the compiler. The macros
3489 __USE_STRING_INLINES and __NO_STRING_INLINES no longer have any effect.
3491 * The nonstandard header <xlocale.h> has been removed. Most programs should
3492 use <locale.h> instead. If you have a specific need for the definition of
3493 locale_t with no other declarations, please contact
3494 libc-alpha@sourceware.org and explain.
3496 * The obsolete header <sys/ultrasound.h> has been removed.
3498 * The obsolete signal constant SIGUNUSED is no longer defined by <signal.h>.
3500 * The obsolete function cfree has been removed. Applications should use
3503 * The stack_t type no longer has the name struct sigaltstack. This changes
3504 the C++ name mangling for interfaces involving this type.
3506 * The ucontext_t type no longer has the name struct ucontext. This changes
3507 the C++ name mangling for interfaces involving this type.
3509 * On M68k GNU/Linux and MIPS GNU/Linux, the fpregset_t type no longer has
3510 the name struct fpregset. On Nios II GNU/Linux, the mcontext_t type no
3511 longer has the name struct mcontext. On SPARC GNU/Linux, the struct
3512 mc_fq, struct rwindow, struct fpq and struct fq types are no longer
3513 defined in sys/ucontext.h, the mc_fpu_t type no longer has the name struct
3514 mc_fpu, the gwindows_t type no longer has the name struct gwindows and the
3515 fpregset_t type no longer has the name struct fpu. This changes the C++
3516 name mangling for interfaces involving those types.
3518 * On S/390 GNU/Linux, the constants defined by <sys/ptrace.h> have been
3519 synced with the kernel:
3521 - PTRACE_GETREGS, PTRACE_SETREGS, PTRACE_GETFPREGS and PTRACE_SETFPREGS
3522 are not supported on this architecture and have been removed.
3524 - PTRACE_SINGLEBLOCK, PTRACE_SECCOMP_GET_FILTER, PTRACE_PEEKUSR_AREA,
3525 PTRACE_POKEUSR_AREA, PTRACE_GET_LAST_BREAK, PTRACE_ENABLE_TE,
3526 PTRACE_DISABLE_TE and PTRACE_TE_ABORT_RAND have been added.
3528 Programs that assume the GET/SETREGS ptrace requests are universally
3529 available will now fail to build, instead of malfunctioning at runtime.
3531 Changes to build and runtime requirements:
3533 * Linux kernel 3.2 or later is required at runtime, on all architectures
3534 supported by that kernel. (This is a change from version 2.25 only for
3537 * GNU Binutils 2.25 or later is now required to build the GNU C Library.
3539 * On most architectures, GCC 4.9 or later is required to build the GNU C
3540 Library. On powerpc64le, GCC 6.2 or later is required.
3542 Older GCC versions and non-GNU compilers are still supported when
3543 compiling programs that use the GNU C Library. (We do not know exactly
3544 how old, and some GNU extensions to C may be _de facto_ required. If you
3545 are interested in helping us make this statement less vague, please
3546 contact libc-alpha@sourceware.org.)
3548 Security related changes:
3550 * The DNS stub resolver limits the advertised UDP buffer size to 1200 bytes,
3551 to avoid fragmentation-based spoofing attacks (CVE-2017-12132).
3553 * LD_LIBRARY_PATH is now ignored in binaries running in privileged AT_SECURE
3554 mode to guard against local privilege escalation attacks (CVE-2017-1000366).
3556 * Avoid printing a backtrace from the __stack_chk_fail function since it is
3557 called on a corrupt stack and a backtrace is unreliable on a corrupt stack
3560 * A use-after-free vulnerability in clntudp_call in the Sun RPC system has been
3561 fixed (CVE-2017-12133).
3563 The following bugs are resolved with this release:
3565 [984] network: Respond to changed resolv.conf in gethostbyname
3566 [5010] network: sunrpc service cleanup causes unwanted port mapper traffic
3567 [12068] localedata: sc_IT: misspelled yesexpr/day/abday/mon/abmon/date_fmt
3569 [12189] libc: __stack_chk_fail should not attempt a backtrace
3571 [14096] time: Race condition on timezone/tst-timezone.out
3572 [14172] localedata: az_IR: new locale
3573 [14995] build: glibc fails to build if gold is the default linker, even if
3575 [15998] build: [powerpc] Set arch_minimum_kernel for powerpc LE
3576 [16637] network: inet_pton function is accepting IPv6 with bad format
3577 [16640] string: string/strtok.c: undefined behaviour inconsistent between
3578 x86 and other generic code
3579 [16875] localedata: ko_KR: fix lang_name
3580 [17225] localedata: ar_SY: localized month names for May and June are
3582 [17297] localedata: da_DK: wrong date_fmt string
3583 [18907] stdio: Incorrect order of __wur __THROW in <printf.h>
3584 [18934] localedata: hu_HU: collate: fix multiple bugs and add tests
3585 [18988] nptl: pthread wastes memory with mlockall(MCL_FUTURE)
3586 [19066] localedata: ar_SA abbreviated day and month names are in English
3587 [19569] network: resolv: Support an arbitrary number of search domains
3588 [19570] network: Implement random DNS server selection in the stub
3590 [19838] locale: localedef fails on PA-RISC
3591 [19919] localedata: iso14651_t1_common: Correct the Malayalam sorting
3592 order of 0D36 and 0D37
3593 [19922] localedata: iso14651_t1_common: Define collation for Malayalam
3595 [20098] libc: FAIL: debug/backtrace-tst on hppa
3596 [20257] network: sunrpc: clntudp_call does not enforce timeout when
3598 [20275] localedata: locale day/abday/mon/abmon should not have trailing
3600 [20313] localedata: Update locale data to Unicode 9.0
3601 [20424] manual: Document how to provide a malloc replacement
3602 [20496] localedata: agr_PE: new language locale Awajún / Aguaruna (agr)
3604 [20686] locale: Add el_GR@euro to SUPPORTED.
3605 [20831] dynamic-link: _dl_map_segments does not test for __mprotect
3606 failures consistently
3607 [21015] dynamic-link: Document and fix --enable-bind-now
3608 [21016] nptl: pthread_cond support is broken on hppa
3609 [21029] libc: glibc-2.23 (and later) fails to compile with -fno-omit-
3610 frame-pointer on i386
3611 [21049] libc: segfault in longjmp_chk() due to clobbered processor
3613 [21075] libc: unused assignment to %g4 in sparc/sparc{64,32}/clone.S
3614 [21088] libc: Build fails with --enable-static-nss
3615 [21094] math: cosf(1.57079697) has 3 ulp error on targets where the
3616 generic c code is used
3617 [21109] libc: Tunables broken on big-endian
3618 [21112] math: powf has large ulp errors with base close to 1 and exponent
3620 [21115] network: sunrpc: Use-after-free in error path in clntudp_call
3622 [21120] malloc: glibc malloc is incompatible with GCC 7
3623 [21130] math: Incorrect return from y0l (-inf) and y1l (-inf) when linking
3625 [21134] math: Exception (divide by zero) not set for y0/y1 (0.0) and y0/y1
3626 (-0.0) when linking with -lieee
3627 [21171] math: log10, log2 and lgamma return incorrect results
3628 [21179] libc: handle R_SPARC_DISP64 and R_SPARC_REGISTER relocs
3629 [21182] libc: __memchr_sse2: regression in glibc-2.25 on i686
3630 [21207] localedata: ce_RU: update weekdays from CLDR
3631 [21209] dynamic-link: LD_HWCAP_MASK read in setuid binaries
3632 [21217] localedata: Update months from CLDR-31
3633 [21232] libc: miss posix_fadvise64 on MIPS64 when static linking
3634 [21243] libc: support_delete_temp_file should issue warning for failed
3636 [21244] libc: support resolv_test_start() socket fd close should be
3638 [21253] libc: localedef randomly segfaults when using -fstack-check due to
3639 new posix_spawn implementation
3640 [21258] dynamic-link: Branch predication in _dl_runtime_resolve_avx512_opt
3641 leads to lower CPU frequency
3642 [21259] libc: [alpha] termios.h missing IXANY for POSIX
3643 [21261] libc: [sparc64] bits/setjmp.h namespace
3644 [21267] network: [mips] bits/socket.h IOC* namespace
3645 [21268] libc: [alpha] termios.h NL2, NL3 namespace
3646 [21270] libc: mmap64 silently truncates large offset values
3647 [21275] libc: posix_spawn always crashes on ia64 now
3648 [21277] libc: [alpha] termios.h missing IUCLC for UNIX98 and older
3649 [21280] math: [powerpc] logbl for POWER7 return incorrect results
3650 [21289] libc: Incorrect declaration for 32-bit platforms with
3651 _FILE_OFFSET_BITS=64 causes build error
3652 [21295] network: GETAI(AF_UNSPEC) drops IPv6 addresses if nss module does
3653 not support gethostbyname4_r
3654 [21298] nptl: rwlock can deadlock on frequent reader/writer phase
3656 [21338] malloc: mallopt M_ARENA_MAX doesn't set the maximum number of
3658 [21340] libc: Support POSIX_SPAWN_SETSID
3659 [21357] libc: unwind-dw2-fde deadlock when using AddressSanitizer
3660 [21359] network: ns_name_pack needs additional byte in destination buffer
3661 [21361] network: resolv: Reduce advertised EDNS0 buffer size to guard
3662 against fragmentation attacks (CVE-2017-12132)
3663 [21369] network: resolv: Remove EDNS fallback
3664 [21371] libc: Missing timespec definition when compiled with _XOPEN_SOURCE
3666 [21386] nptl: Assertion in fork for distinct parent PID is incorrect
3667 [21391] dynamic-link: x86: Set dl_platform and dl_hwcap from CPU features
3668 [21393] stdio: Missing dup3 error check in freopen, freopen64
3669 [21396] libc: Use AVX2 memcpy/memset on Skylake server
3670 [21399] localedata: Bad description for U00EC in
3671 localedata/charmaps/CP1254
3672 [21411] malloc: realloc documentation error
3673 [21426] network: sys/socket.h uio.h namespace
3674 [21428] libc: [aarch64] tst-backtrace5 testsuite failure
3675 [21445] libc: signal.h bsd_signal namespace
3676 [21455] network: Network headers stdint.h namespace
3677 [21474] network: resolv: res_init does not use RES_DFLRETRY (2) but 4 for
3679 [21475] network: resolv: Overlong search path is truncated mid-label
3680 [21511] libc: sigstack namespace
3681 [21512] libc: clone() ends up calling exit_group() through _exit() wrapper
3682 [21514] libc: sysdeps/unix/sysv/linux/sys/syscall.h:31:27: fatal error:
3683 bits/syscall.h: No such file or directory
3684 [21517] libc: struct sigaltstack namespace
3685 [21528] dynamic-link: Duplicated minimal strtoul implementations in ld.so
3686 [21533] localedata: Update locale data to Unicode 10.0
3688 ../sysdeps/unix/sysv/linux/s390/s390-32/__makecontext_ret.S:44: Error:
3689 junk at end of line, first unrecognized character is `@'
3690 [21538] libc: SIG_HOLD missing for XPG4
3691 [21539] libc: S390: Mismatch between kernel and glibc ptrace.h with
3692 request 12: PTRACE_SINGLEBLOCK vs PTRACE_GETREGS.
3693 [21542] libc: Use conservative default for sysconf (_SC_NPROCESSORS_ONLN)
3694 [21543] libc: sigevent namespace
3695 [21548] libc: [mips] get/set/make/swap context for MIPS O32 assume wrong
3696 size for general purpose registers in mcontext_t structure
3697 [21550] libc: sigwait namespace
3698 [21552] libc: XPG4 bsd_signal namespace
3699 [21554] libc: sigpause namespace
3700 [21560] libc: sys/wait.h signal.h namespace
3701 [21561] libc: waitid namespace
3702 [21573] nptl: GCC 7: /usr/bin/install: cannot remove
3703 '/usr/include/stdlib.h': Permission denied
3704 [21575] libc: sys/wait.h missing struct rusage definition
3705 [21584] libc: sigaltstack etc namespace
3706 [21597] libc: siginterrupt namespace
3707 [21607] math: hppa: FAIL: math/test-tgmath
3708 [21609] dynamic-link: Incomplete workaround for GCC __tls_get_addr ABI
3710 [21622] libc: [tile] missing SA_* for POSIX.1:2008
3711 [21624] dynamic-link: ld.so: Unsafe alloca allows local attackers to alias
3712 stack and heap (CVE-2017-1000366)
3713 [21625] libc: wait3 namespace
3714 [21654] nss: Incorrect pointer alignment in NSS group merge result
3716 [21657] network: Parse interface zone id for node-local multicast
3717 [21662] string: memcmp-avx2-movbe.S lacks saturating subtraction for
3719 [21666] libc: .symver is used on common symbol
3720 [21668] network: resolv: res_init cross-thread broadcast introduces race
3722 [21687] math: tgmath.h totalorder, totalordermag return type
3723 [21694] locale: Current Glibc Locale Does Not Support Tok-Pisin and Fiji
3725 [21696] libc: Incorrect assumption of of __cpu_mask in
3726 posix/sched_cpucount.c
3727 [21697] libc: sysdeps/posix/spawni.c: 2 * suspicious condition ?
3728 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
3730 [21707] math: ppc64le: Invalid IFUNC resolver from libgcc calls getauxval,
3731 leading to relocation crash
3732 [21709] libc: resolv_conf.c:552: update_from_conf: Assertion
3733 `resolv_conf_matches (resp, conf)' failed.
3734 [21710] localedata: Added Samoan language locale for Samoa
3735 [21711] localedata: Pashto yesstr/nostr locale are missing
3736 [21715] nptl: sysdeps/nptl/bits/pthreadtypes.h: typedef guard
3737 __have_pthread_attr_t can cause redefinition of typedef ‘pthread_attr_t’
3738 [21721] localedata: Incorrect Full Weekday names for ks_IN@devanagari
3739 [21723] localedata: yesstr/nostr missing for Chinese language locale
3740 [21724] localedata: yesstr and nostr are missing for Xhosa [LC_MESSAGES]
3742 [21727] localedata: yesstr and nostr are missing for Tsonga [LC_MESSAGES]
3744 [21728] localedata: New Locale for Tongan language
3745 [21729] localedata: incorrect LC_NAME fields for hi_IN
3746 [21733] localedata: yesstr and nostr are missing for zh_HK
3747 [21734] localedata: Missing yesstr and nostr are for kw_GB
3748 [21738] libc: misc/tst-preadvwritev2 and misc/tst-preadvwritev64v2 fail
3749 [21741] libc: Undefined __memmove_chk_XXX and __memset_chk_XXX in libc.a
3750 [21742] libc: _dl_num_cache_relocations is undefined in libc.a
3751 [21743] localedata: ks_IN@devanagari: abday strings mismatch the day
3753 [21744] libc: Tests failing on --enable-tunables --enable-stack-
3755 [21749] localedata: Wrong abbreviated day name (“abday”) for
3757 [21756] localedata: missing yesstr, nostr for nds_DE and nds_NL
3758 [21757] localedata: missing yesstr, nostr for pap_AW and pap_CW
3759 [21759] localedata: missing yesstr and nostr for Tigrinya
3760 [21760] localedata: Fix LC_MESSAGES and LC_ADDRESS for anp_IN
3761 [21766] localedata: Wrong LC_MESSAGES for om_ET Locale
3762 [21767] localedata: Missing Bislama locales
3763 [21768] localedata: Missing yesstr and nostr for aa_ET
3764 [21770] localedata: Missing Field in li_NL
3765 [21778] nptl: Robust mutex may deadlock
3766 [21779] libc: MicroBlaze segfaults when loading libpthread
3767 [21783] localedata: Fix int_select international_call_prefixes
3768 [21784] localedata: Inconsistency in country_isbn
3769 [21788] localedata: Missing Country Postal Abbreviations
3770 [21794] localedata: Added-country_isbn-for-Italy
3771 [21795] localedata: Add/Fix country_isbn for France
3772 [21796] localedata: Added country_isbn for Republic of Korea
3773 [21797] localedata: Fix inconsistency in country_isbn and missing prefixes
3774 [21799] localedata: Added int_select international_call_prefixes
3775 [21801] localedata: Added int_select international_call_prefixes
3776 [21804] nptl: Double semicolon in thread-shared-types.h
3777 [21807] localedata: LC_ADDRESS fix for pap_CW
3778 [21808] localedata: Fix LC_ADDRESS for pap_AW
3779 [21821] localedata: Added country_name in mai_IN
3780 [21822] localedata: Fix LC_TIME for mai_IN
3781 [21823] localedata: missing yesstr, nostr for sa_IN
3782 [21825] localedata: Fix name_mrs for mag_IN
3783 [21828] localedata: 2.26 changelog should mention user visible changes
3785 [21835] localedata: Added Maithili language locale for Nepal
3786 [21838] localedata: Removed redundant data for the_NP
3787 [21839] localedata: Fix LC_MONETARY for ta_LK
3788 [21844] localedata: Fix Latin characters and Months Sequence.
3789 [21848] localedata: Fix mai_NP Title Name
3794 * The feature test macro __STDC_WANT_LIB_EXT2__, from ISO/IEC TR
3795 24731-2:2010, is supported to enable declarations of functions from that
3796 TR. Note that not all functions from that TR are supported by the GNU C
3799 * The feature test macro __STDC_WANT_IEC_60559_BFP_EXT__, from ISO/IEC TS
3800 18661-1:2014, is supported to enable declarations of functions and macros
3801 from that TS. Note that not all features from that TS are supported by
3804 * The feature test macro __STDC_WANT_IEC_60559_FUNCS_EXT__, from ISO/IEC TS
3805 18661-4:2015, is supported to enable declarations of functions and macros
3806 from that TS. Note that most features from that TS are not supported by
3809 * The nonstandard feature selection macros _REENTRANT and _THREAD_SAFE are
3810 now treated as compatibility synonyms for _POSIX_C_SOURCE=199506L.
3811 Since the GNU C Library defaults to a much newer revision of POSIX, this
3812 will only affect programs that specifically request an old conformance
3813 mode. For instance, a program compiled with -std=c89 -D_REENTRANT will
3814 see a change in the visible declarations, but a program compiled with
3815 just -D_REENTRANT, or -std=c99 -D_POSIX_C_SOURCE=200809L -D_REENTRANT,
3818 Some C libraries once required _REENTRANT and/or _THREAD_SAFE to be
3819 defined by all multithreaded code, but glibc has not required this for
3822 * The inclusion of <sys/sysmacros.h> by <sys/types.h> is deprecated. This
3823 means that in a future release, the macros “major”, “minor”, and “makedev”
3824 will only be available from <sys/sysmacros.h>.
3826 These macros are not part of POSIX nor XSI, and their names frequently
3827 collide with user code; see for instance glibc bug 19239 and Red Hat bug
3828 130601. <stdlib.h> includes <sys/types.h> under _GNU_SOURCE, and C++ code
3829 presently cannot avoid being compiled under _GNU_SOURCE, exacerbating the
3832 * New <fenv.h> features from TS 18661-1:2014 are added to libm: the
3833 fesetexcept, fetestexceptflag, fegetmode and fesetmode functions, the
3834 femode_t type and the FE_DFL_MODE and FE_SNANS_ALWAYS_SIGNAL macros.
3836 * Integer width macros from TS 18661-1:2014 are added to <limits.h>:
3837 CHAR_WIDTH, SCHAR_WIDTH, UCHAR_WIDTH, SHRT_WIDTH, USHRT_WIDTH, INT_WIDTH,
3838 UINT_WIDTH, LONG_WIDTH, ULONG_WIDTH, LLONG_WIDTH, ULLONG_WIDTH; and to
3839 <stdint.h>: INT8_WIDTH, UINT8_WIDTH, INT16_WIDTH, UINT16_WIDTH,
3840 INT32_WIDTH, UINT32_WIDTH, INT64_WIDTH, UINT64_WIDTH, INT_LEAST8_WIDTH,
3841 UINT_LEAST8_WIDTH, INT_LEAST16_WIDTH, UINT_LEAST16_WIDTH,
3842 INT_LEAST32_WIDTH, UINT_LEAST32_WIDTH, INT_LEAST64_WIDTH,
3843 UINT_LEAST64_WIDTH, INT_FAST8_WIDTH, UINT_FAST8_WIDTH, INT_FAST16_WIDTH,
3844 UINT_FAST16_WIDTH, INT_FAST32_WIDTH, UINT_FAST32_WIDTH, INT_FAST64_WIDTH,
3845 UINT_FAST64_WIDTH, INTPTR_WIDTH, UINTPTR_WIDTH, INTMAX_WIDTH,
3846 UINTMAX_WIDTH, PTRDIFF_WIDTH, SIG_ATOMIC_WIDTH, SIZE_WIDTH, WCHAR_WIDTH,
3849 * New <math.h> features are added from TS 18661-1:2014:
3851 - Signaling NaN macros: SNANF, SNAN, SNANL.
3853 - Nearest integer functions: roundeven, roundevenf, roundevenl, fromfp,
3854 fromfpf, fromfpl, ufromfp, ufromfpf, ufromfpl, fromfpx, fromfpxf,
3855 fromfpxl, ufromfpx, ufromfpxf, ufromfpxl.
3857 - llogb functions: the llogb, llogbf and llogbl functions, and the
3858 FP_LLOGB0 and FP_LLOGBNAN macros.
3860 - Max-min magnitude functions: fmaxmag, fmaxmagf, fmaxmagl, fminmag,
3863 - Comparison macros: iseqsig.
3865 - Classification macros: iscanonical, issubnormal, iszero.
3867 - Total order functions: totalorder, totalorderf, totalorderl,
3868 totalordermag, totalordermagf, totalordermagl.
3870 - Canonicalize functions: canonicalize, canonicalizef, canonicalizel.
3872 - NaN functions: getpayload, getpayloadf, getpayloadl, setpayload,
3873 setpayloadf, setpayloadl, setpayloadsig, setpayloadsigf, setpayloadsigl.
3875 * The functions strfromd, strfromf, and strfroml, from ISO/IEC TS 18661-1:2014,
3876 are added to libc. They convert a floating-point number into string.
3878 * Most of glibc can now be built with the stack smashing protector enabled.
3879 It is recommended to build glibc with --enable-stack-protector=strong.
3880 Implemented by Nick Alcock (Oracle).
3882 * The function explicit_bzero, from OpenBSD, has been added to libc. It is
3883 intended to be used instead of memset() to erase sensitive data after use;
3884 the compiler will not optimize out calls to explicit_bzero even if they
3885 are "unnecessary" (in the sense that no _correct_ program can observe the
3886 effects of the memory clear).
3888 * On ColdFire, MicroBlaze, Nios II and SH3, the float_t type is now defined
3889 to float instead of double. This does not affect the ABI of any libraries
3890 that are part of the GNU C Library, but may affect the ABI of other
3891 libraries that use this type in their interfaces.
3893 * On x86_64, when compiling with -mfpmath=387 or -mfpmath=sse+387, the
3894 float_t and double_t types are now defined to long double instead of float
3895 and double. These options are not the default, and this does not affect
3896 the ABI of any libraries that are part of the GNU C Library, but it may
3897 affect the ABI of other libraries that use this type in their interfaces,
3898 if they are compiled or used with those options.
3900 * The getentropy and getrandom functions, and the <sys/random.h> header file
3903 * The buffer size for byte-oriented stdio streams is now limited to 8192
3904 bytes by default. Previously, on Linux, the default buffer size on most
3905 file systems was 4096 bytes (and thus remains unchanged), except on
3906 network file systems, where the buffer size was unpredictable and could be
3907 as large as several megabytes.
3909 * The <sys/quota.h> header now includes the <linux/quota.h> header. Support
3910 for the Linux quota interface which predates kernel version 2.4.22 has
3913 * The malloc_get_state and malloc_set_state functions have been removed.
3914 Already-existing binaries that dynamically link to these functions will
3915 get a hidden implementation in which malloc_get_state is a stub. As far
3916 as we know, these functions are used only by GNU Emacs and this change
3917 will not adversely affect already-built Emacs executables. Any undumped
3918 Emacs executables, which normally exist only during an Emacs build, should
3919 be rebuilt by re-running “./configure; make” in the Emacs build tree.
3921 * The “ip6-dotint” and “no-ip6-dotint” resolver options, and the
3922 corresponding RES_NOIP6DOTINT flag from <resolv.h> have been removed.
3923 “no-ip6-dotint” had already been the default, and support for the
3924 “ip6-dotint” option was removed from the Internet in 2006.
3926 * The "ip6-bytestring" resolver option and the corresponding RES_USEBSTRING
3927 flag from <resolv.h> have been removed. The option relied on a
3928 backwards-incompatible DNS extension which was never deployed on the
3931 * The flags RES_AAONLY, RES_PRIMARY, RES_NOCHECKNAME, RES_KEEPTSIG,
3932 RES_BLAST defined in the <resolv.h> header file have been deprecated.
3933 They were already unimplemented.
3935 * The "inet6" option in /etc/resolv.conf and the RES_USE_INET6 flag for
3936 _res.flags are deprecated. The flag was standardized in RFC 2133, but
3937 removed again from the IETF name lookup interface specification in RFC
3938 2553. Applications should use getaddrinfo instead.
3940 * DNSSEC-related declarations and definitions have been removed from the
3941 <arpa/nameser.h> header file, and libresolv will no longer attempt to
3942 decode the data part of DNSSEC record types. Previous versions of glibc
3943 only implemented minimal support for the previous version of DNSSEC, which
3944 is incompatible with the currently deployed version.
3946 * The resource record type classification macros ns_t_qt_p, ns_t_mrr_p,
3947 ns_t_rr_p, ns_t_udp_p, ns_t_xfr_p have been removed from the
3948 <arpa/nameser.h> header file because the distinction between RR types and
3949 meta-RR types is not officially standardized, subject to revision, and
3950 thus not suitable for encoding in a macro.
3952 * The types res_sendhookact, res_send_qhook, re_send_rhook, and the qhook
3953 and rhook members of the res_state type in <resolv.h> have been removed.
3954 The glibc stub resolver did not support these hooks, but the header file
3955 did not reflect that.
3957 * For multi-arch support it is recommended to use a GCC which has
3958 been built with support for GNU indirect functions. This ensures
3959 that correct debugging information is generated for functions
3960 selected by IFUNC resolvers. This support can either be enabled by
3961 configuring GCC with '--enable-gnu-indirect-function', or by
3962 enabling it by default by setting 'default_gnu_indirect_function'
3963 variable for a particular architecture in the GCC source file
3966 * GDB pretty printers have been added for mutex and condition variable
3967 structures in POSIX Threads. When installed and loaded in gdb these pretty
3968 printers show various pthread variables in human-readable form when read
3969 using the 'print' or 'display' commands in gdb.
3971 * Tunables feature added to allow tweaking of the runtime for an application
3972 program. This feature can be enabled with the '--enable-tunables' configure
3973 flag. The GNU C Library manual has details on usage and README.tunables has
3974 instructions on adding new tunables to the library.
3976 * A new version of condition variables functions have been implemented in
3977 the NPTL implementation of POSIX Threads to provide stronger ordering
3980 * A new version of pthread_rwlock functions have been implemented to use a more
3981 scalable algorithm primarily through not using a critical section anymore to
3984 Security related changes:
3986 * On ARM EABI (32-bit), generating a backtrace for execution contexts which
3987 have been created with makecontext could fail to terminate due to a
3988 missing .cantunwind annotation. This has been observed to lead to a hang
3989 (denial of service) in some Go applications compiled with gccgo. Reported
3990 by Andreas Schwab. (CVE-2016-6323)
3992 * The DNS stub resolver functions would crash due to a NULL pointer
3993 dereference when processing a query with a valid DNS question type which
3994 was used internally in the implementation. The stub resolver now uses a
3995 question type which is outside the range of valid question type values.
3998 The following bugs are resolved with this release:
4000 [4099] stdio: Overly aggressive caching by stream i/o functions.
4001 [7065] build: Support building glibc with -fstack-protector or -fstack-
4003 [9842] localedata: en_CA: incorrect date format
4004 [13165] nptl: pthread_cond_wait() can consume a signal that was sent
4005 before it started waiting
4006 [14139] manual: Do not hardcode platform names in manual/libm-err-tab.pl
4007 [15765] nptl: sem_open is wrongly a cancellation point
4008 [16421] network: IN6_IS_ADDR_UNSPECIFIED can use undefined s6_addr32
4009 [16458] libc: endian.h and netinet/in.h byte order macros return values of
4011 [16628] dynamic-link: Segfault after a binary without pthread dlopen()s a
4012 library linked with pthread
4013 [16630] nptl: Use SYSENTER for pthread_cond_broadcast/signal() (i.e. fix
4014 "FIXME: Ingo" issue)
4015 [16907] libc: <argp.h> compiled with --std=cXX disables __attribute__
4016 [17252] libc: getrandom and getentropy syscall
4017 [17730] malloc: thread-local storage is sometimes improperly free()'d
4018 after being __libc_memalign()'d
4019 [18241] stdio: failed fseek on memstream does not set errno and can fail
4021 [18243] nptl: sem_wait, sem_timedwait are cancellation points shm_open is
4023 [18463] nptl: pthread_cond_broadcast issue when surrounded by
4024 PTHREAD_PRIO_INHERIT mutex on ARM
4025 [18784] network: res_query and related function crash for special record
4026 type queries (CVE-2015-5180)
4027 [19380] math: strtod does not raise "inexact"
4028 [19387] string: Integer overflow in memchr
4029 [19390] string: Integer overflow in strncat
4030 [19398] build: linknamespace tests fail with massively parallel build
4031 [19402] nptl: Deadlock with robust shared mutex and asynchronous
4033 [19469] malloc: M_PERTURB in test-skeleton.c invalidates malloc tests
4034 [19473] malloc: Turn malloc_get_state etc. in compatibility symbols
4035 [19514] libc: [PATCH] Fix spelling errors in spelling
4036 "implement"/"implementation" in several places
4037 [19582] network: Deprecate RES_USE_INET6
4038 [19673] manual: clog10 docs appear to be erroneous
4039 [19810] dynamic-link: dlopen with both RTLD_NOLOAD and RTLD_NODELETE
4040 causes a segmentation fault
4041 [19826] libc: invalid pointer returned from __tls_get_addr with static
4043 [20016] network: resolv: Remove hooks support from the API
4044 [20019] dynamic-link: NULL pointer dereference in libc.so.6 IFUNC due to
4046 [20033] math: [x86_64] vectorized math function don't call the __finite
4048 [20116] nptl: use after free in pthread_create
4049 [20181] stdio: open_memstream(): writes not at end of stream corrupt data
4050 [20292] dynamic-link: Comparison in elf/dl-open.c _dl_addr_inside_object
4052 [20311] nptl: please install proc_service.h
4053 [20366] libc: Compilation errors in installed headers in strict-compliance
4055 [20370] malloc: malloc: Arena free list management is still racy
4056 (incorrect fix in bug 19243)
4057 [20386] libc: assert (X = 0) does not result in GCC warning
4058 [20432] malloc: malloc: Minimize interface required for interposition
4059 [20435] libc: Missing unwind info in __startcontext causes infinite loop
4060 in _Unwind_Backtrace (CVE-2016-6323)
4061 [20444] hurd: recvmsg: PF_LOCAL sockets and msg_name lead to SIGLOST
4062 [20452] nptl: Addition of sysdep.o to libpthread.a breaks relinking
4064 [20455] math: [powerpc] fesetexceptflag fails to clear FE_INVALID
4065 [20459] localedata: et_EE: locale has wrong {p,n}_cs_precedes value
4066 [20477] network: resolv: incorrect double-checked locking related to
4068 [20478] libc: libc_ifunc macro and similar usages leads to false debug-
4070 [20495] math: x86_64 performance degradation due to AVX/SSE transition
4072 [20497] localedata: lt_LT: LC_TIME d_fmt used is obsolete
4073 [20508] dynamic-link: _dl_runtime_resolve_avx/_dl_runtime_profile_avx512
4074 cause transition penalty
4075 [20517] math: sparcv9 missing fdiml compat symbol
4076 [20524] manual: strverscmp is inconsistent
4077 [20525] libc: <sys/quota.h> should be based on kernel headers
4078 [20539] math: GCC 7 -static -lm fails to link at -O3
4079 [20554] libc: ld: bss-plt forced due to /usr/lib/libc_nonshared.a(ppc-
4081 [20558] string: POSIX bcopy/bzero decls do not implement Object Size
4083 [20591] network: Remove obsolete DNSSEC support
4084 [20592] network: DNS resource record type classification macros in
4085 <arpa/nameser.h> are incorrect
4086 [20593] network: Update DNS RR type definitions
4087 [20611] network: getaddrinfo accepts invalid numeric scope IDs
4088 [20615] build: glibc build fails when using --with-cpu=power9 --enable-
4090 [20629] network: libresolv: Remove support for bitstring labels
4092 [20647] libc: GLIBC quitting every program - glibc on Pentium-S leads to
4093 assertion: "maxidx >= 2"
4094 [20660] math: [arm] Use VSQRT
4095 [20662] libc: checking whether x86_64-pc-linux-gnu-gcc implicitly enables
4096 -fstack-protector no (32bit gcc 6.2.0 pie and ssp enable)
4097 [20689] libc: Test for FMA should also check for AVX.
4098 [20707] glob: gl_pathv entries not set to NULL with GLOB_DOOFFS
4099 [20715] math: iszero macro breaks existing code
4100 [20718] math: [powerpc] copysignl raises "invalid" for sNaN
4101 [20728] libc: powerpc: Missing TOC stub in clone
4102 [20729] build: glibc-2.24 fails to build for i486 with -Os
4103 [20750] build: Build fails with default PIE enabled gcc-6.x
4104 [20768] math: [alpha] sqrt fegetenv namespace
4105 [20785] libc: binutils 2.28 fails to assemble power6/memset.S file in
4107 [20787] math: float_t is defined as float incorrectly on x86_64 even if
4108 __FLT_EVAL_METHOD__ is 2
4109 [20790] network: rpcgen buffer overrun in get_prog_declaration
4110 [20822] nptl: race condition in __lll_unlock_elision on powerpc
4111 [20829] libc: crypt snprintf namespace
4112 [20847] libc: tst-vfork3 failure
4113 [20855] math: Default bits/mathdef.h has inappropriate float_t
4114 [20859] math: [sh4] FP_ILOGB0 invalid
4115 [20864] localedata: iconv: cp936 missing single-byte euro sign (0x80,
4116 U+20AC), not same as GBK
4117 [20915] dynamic-link: global-dynamic TLS broken on aarch64
4118 [20916] math: pow handling of sNaN arguments
4119 [20918] build: Building with --enable-nss-crypt fails tst-linkall-static.
4120 [20919] math: Bad pow (qNaN, 0) result with -lieee
4121 [20940] math: hypot sNaN handling
4122 [20947] math: fmax, fmin sNaN handling
4123 [20956] libc: debug/tst-backtrace3-6 don't work with -O3 anymore
4124 [20964] network: sunrpc: Stack-based buffer overflow in getrpcport with
4126 [20971] string: powerpc64/power7 memchr overflows internal pointer check
4127 [20973] nptl: robust mutexes: Lost wake-ups
4128 [20974] locale: bs_BA: yesexpr/noexpr regexes accept any character
4129 [20978] nis: strlen on null pointer in nss_nisplus
4130 [20985] nptl: robust mutexes: lowlevelrobustlock assembly on x86 blocks on
4132 [21014] string: i686 memchr overflows internal pointer check
4133 [21019] libc: [mips] n32 lseek incorrect on overflow
4134 [21022] libc: [microblaze] __backtrace get_frame_size namespace
4135 [21026] libc: [MIPS] readahead syscall is broken on n64
4136 [21028] math: Fallback fesetexceptflag should always succeed
4137 [21045] libc: [powerpc-nofpu] swapcontext does not restore signal mask
4138 [21047] math: arm: fpu_control.h: _FPU_GETCW/_FPU_SETCW is rejected by
4140 [21053] libc: [SH] Namespace pollution from sys/ucontext.h
4141 [21061] librt: [microblaze] librt lost clock_* exports
4142 [21073] libc: tunables: insecure environment variables passed to
4143 subprocesses with AT_SECURE
4144 [21081] string: Missing vzeroupper in memset-vec-unaligned-erms.S
4148 * The minimum Linux kernel version that this version of the GNU C Library
4149 can be used with is 3.2, except on i[4567]86 and x86_64, where Linux
4150 kernel version 2.6.32 or later suffices (on architectures that already
4151 required kernel versions more recent than 3.2, those requirements remain
4152 unchanged). Linux 3.2 or later kernel headers are required on all
4155 * The pap_AN locale has been deleted. This has been deprecated for a long
4156 time. It has been replaced by pap_AW & pap_CW, both of which have long
4157 been included in previous releases.
4159 * The readdir_r and readdir64_r functions have been deprecated. It is
4160 recommended to use readdir and readdir64 instead.
4162 * The type “union wait” has been removed. It was deprecated in the early
4163 1990s and never part of POSIX. Application code should use the int type
4164 instead of “union wait”.
4166 * A new NSS action is added to facilitate large distributed system
4167 administration. The action, MERGE, allows remote user stores like LDAP
4168 to be merged into local user stores like /etc/groups in order to provide
4169 easy to use, updated, and managed sets of merged credentials. The new
4170 action can be used by configuring it in /etc/nsswitch.conf:
4171 group: files [SUCCESS=merge] nis
4172 Implemented by Stephen Gallagher (Red Hat).
4174 * The deprecated __malloc_initialize_hook variable has been removed from the
4177 * The long unused localedef --old-style option has been removed. It hasn't
4178 done anything in over 16 years. Scripts using this option can safely
4181 * nextupl, nextup, nextupf, nextdownl, nextdown and nextdownf are added to
4182 libm. They are defined by TS 18661 and IEEE754-2008. The nextup functions
4183 return the next representable value in the direction of positive infinity
4184 and the nextdown functions return the next representable value in the
4185 direction of negative infinity. These are currently enabled as GNU
4188 Security related changes:
4190 * An unnecessary stack copy in _nss_dns_getnetbyname_r was removed. It
4191 could result in a stack overflow when getnetbyname was called with an
4192 overly long name. (CVE-2016-3075)
4194 * Previously, getaddrinfo copied large amounts of address data to the stack,
4195 even after the fix for CVE-2013-4458 has been applied, potentially
4196 resulting in a stack overflow. getaddrinfo now uses a heap allocation
4197 instead. Reported by Michael Petlan. (CVE-2016-3706)
4199 * The glob function suffered from a stack-based buffer overflow when it was
4200 called with the GLOB_ALTDIRFUNC flag and encountered a long file name.
4201 Reported by Alexander Cherepanov. (CVE-2016-1234)
4203 * The Sun RPC UDP client could exhaust all available stack space when
4204 flooded with crafted ICMP and UDP messages. Reported by Aldy Hernandez'
4205 alloca plugin for GCC. (CVE-2016-4429)
4207 * The IPv6 name server management code in libresolv could result in a memory
4208 leak for each thread which is created, performs a failing naming lookup,
4209 and exits. Over time, this could result in a denial of service due to
4210 memory exhaustion. Reported by Matthias Schiffer. (CVE-2016-5417)
4212 The following bugs are resolved with this release:
4214 [1170] localedata: ne_NP: update Nepali locale definition file
4215 [3629] manual: stpcpy description in string.texi refers to MS-DOG instead
4217 [6527] malloc: [powerpc] Malloc alignment insufficient for PowerPC
4218 [6796] math: fdim() does not set errno on overflow
4219 [10354] libc: posix_spawn should use vfork() in more cases than presently
4220 [11213] localedata: localedata: add copyright disclaimer to locale files
4221 [12143] localedata: chr_US: new Cherokee locale
4222 [12450] localedata: sgs_LT: new locale
4223 [12676] localedata: ln_CD: new locale
4224 [13237] localedata: LC_ADDRESS.country_name: update all locales w/latest
4226 [13304] math: fma, fmaf, fmal produce wrong results
4227 [14259] build: --localedir arg to configure is ignored
4228 [14499] nptl: Does posix_spawn invoke atfork handlers / use vfork?
4229 [14750] libc: Race condition in posix_spawn vfork usage vs signal handlers
4230 [14934] localedata: es_CL: wrong first weekday chilean locale
4231 [15262] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of
4233 [15263] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of 1/0
4235 [15264] localedata: LC_MESSAGES.yesstr/nostr: lacking in many locales
4236 [15368] nptl: raise() is not async-signal-safe
4237 [15479] math: ceil, floor, round and trunc raise inexact exception
4238 [15578] localedata: kk_KZ: various updates
4239 [16003] localedata: pap_AN: punt old locale
4240 [16137] localedata: iw_IL: punt old locale
4241 [16190] localedata: eo: new esperanto locale
4242 [16374] localedata: lv_LV: change currency symbol in LC_MONETARY to euro
4243 [16742] malloc: race condition: pthread_atfork() called before first
4244 malloc() results in unexpected locking behaviour/deadlocks
4245 [16975] localedata: LC_MESSAGES.yesexpr/noexpr: revisit capitalization in
4247 [16983] localedata: postal_fmt does not allow %l and %n modifiers
4248 [17565] localedata: pt_PT: wrong (work-)week start
4249 [17899] math: [powerpc] floorl returns negative zero with FE_DOWNWARD
4250 [17950] build: Build fails with -msse
4251 [18205] localedata: be_BY*: wrong first_weekday and first_workday
4252 [18433] libc: posix_spawn does not return correctly upon failure to
4254 [18453] localedata: charmaps/IBM875: incorrect codes
4255 [18712] string: bits/string2.h incompatible with -O2 -Werror=packed
4257 [18896] localedata: he_IL: improvements for currency
4258 [18911] localedata: ro_RO: Correcting week day name for "Tuesday" in
4259 Romanian locale data
4260 [18960] locale: s390: _nl_locale_subfreeres uses larl opcode on misaligned
4262 [19056] libc: Deprecate readdir_r
4263 [19133] localedata: pt_*: days & months should be lowercase in Portuguese
4265 [19198] localedata: nl_NL: small improvements for Dutch locales
4266 [19257] network: Per-thread memory leak in __res_vinit with IPv6
4267 nameservers (CVE-2016-5417)
4268 [19269] build: tst-audit4 and tst-audit10 failures with gcc-6 on non avx
4270 [19400] locale: Language missing in "iso-639.def", trivial fix in
4272 [19431] malloc: Deadlock between fflush, getdelim, and fork
4273 [19505] libc: Incorrect file descriptor validity checks in
4274 posix_spawn_file_actions_add{open,close,dup2}
4275 [19509] dynamic-link: dlsym, dlvsym do not report errors through dlerror
4276 when using RTLD_NEXT
4277 [19512] locale: Stale `#ifndef HAVE_BUILTIN_EXPECT' in
4278 `intl/{gettextP,loadinfo}.h'
4279 [19534] libc: execle, execlp may use malloc
4280 [19568] localedata: *_CH: Swiss locales have inconsistent start of week
4281 [19573] network: res_nclose and __res_maybe_init disagree about name
4282 server initialization, breaking Hesiod
4283 [19575] localedata: Status of GB18030 tables
4284 [19581] localedata: sr_* date_fmt string contains additional newline
4285 [19583] string: SSSE3_Fast_Copy_Backward flag needs to be enabled for AMD
4287 [19592] math: [ldbl-128ibm] ceill incorrect in non-default rounding modes
4288 [19593] math: [ldbl-128ibm] truncl incorrect in non-default rounding modes
4289 [19594] math: [ldbl-128ibm] roundl incorrect in non-default rounding modes
4290 [19595] math: [ldbl-128ibm] fmodl incorrect for results in subnormal
4292 [19602] math: [ldbl-128ibm] fmodl handling of equal arguments with low
4294 [19603] math: [ldbl-128ibm] remainderl, remquol incorrect sign handling in
4296 [19610] dynamic-link: ldconfig -X removes stale symbolic links
4297 [19613] libc: s390x (64 bit) macro expansion WCOREDUMP and others
4298 [19633] locale: strfmon_l applies global locale to number formatting
4299 [19642] network: Memory leak in getnameinfo
4300 [19648] libc: test-skeleton.c: Do not set RLIMIT_DATA
4301 [19653] libc: Potential for NULL pointer dereference (CWE-476) in
4303 [19654] math: [x86_64] Need testcase for BZ #19590 fix
4304 [19671] localedata: Missing Sanity Check for malloc() in 'tst-fmon.c' &
4306 [19674] math: [ldbl-128ibm] powl incorrect overflow handling
4307 [19677] math: [ldbl-128ibm] remainderl equality test incorrect for zero
4309 [19678] math: [ldbl-128ibm] nextafterl, nexttowardl incorrect sign of zero
4311 [19679] dynamic-link: gcc-4.9.3 C++ exception handling broken due to
4313 [19726] locale: Converting UCS4LE to INTERNAL with iconv() does not update
4314 pointers and lengths in error-case.
4315 [19727] locale: Converting from/to UTF-xx with iconv() does not always
4316 report errors on UTF-16 surrogates values.
4317 [19755] nscd: nscd assertion failure in gc
4318 [19758] dynamic-link: Typo in EXTRA_LD_ENVVARS for x86-64
4319 [19759] libc: mempcpy shouldn't be inlined
4320 [19762] dynamic-link: HAS_CPU_FEATURE/HAS_ARCH_FEATURE are easy to misuse
4321 [19765] libc: s390 needs an optimized mempcpy
4322 [19779] glob: glob: buffer overflow with GLOB_ALTDIRFUNC due to incorrect
4323 NAME_MAX limit assumption (CVE-2016-1234)
4324 [19783] build: benchtests don't support --enable-hardcoded-path-in-tests
4325 [19787] network: Missing and incorrect truncation checks in getnameinfo
4326 [19790] math: [ldbl-128ibm] nearbyintl incorrect in non-default rounding
4328 [19791] network: Assertion failure in res_query.c with un-connectable name
4330 [19792] libc: MIPS: backtrace yields infinite backtrace with makecontext
4331 [19822] math: libm.so install clobbers old version
4332 [19825] network: resolv: send_vc can return uninitialized data in second
4333 response to getaddrinfo
4334 [19830] network: nss_dns: should check RDATA length against buffer length
4335 [19831] network: nss_dns: getaddrinfo returns uninitialized data when
4336 confronted with A/AAAA records of invalid size
4337 [19837] nss: nss_db: No retries for some long lines with a larger buffer
4338 [19848] math: powl(10,n) for n=-4,-5,-6,-7 is off by more than 1 ULP
4339 [19853] stdio: Printing IBM long double in decimal with high precision is
4341 [19860] build: x86_64: compile errors for tst-audit10 and tst-auditmod10b
4342 [19861] nptl: libpthread IFUNC resolver for fork can lead to crash
4343 [19862] network: resolv, nss_dns: Remove remaining logging of unexpected
4345 [19865] network: Assertion failure or memory leak in
4346 _nss_dns_getcanonname_r
4347 [19868] network: nss_dns: netent code does not skip over non-PTR records
4348 [19879] network: nss_dns: Stack overflow in getnetbyname implementation
4350 [19881] string: Improve x86-64 memset
4351 [19907] string: Incorrect memcpy tests
4352 [19916] dynamic-link: S390: fprs/vrs are not saved/restored while
4354 [19925] libc: termios.h XCASE namespace
4355 [19928] string: memmove-vec-unaligned-erms.S is slow with large data size
4356 [19929] libc: limits.h NL_NMAX namespace
4357 [19931] stdio: Memory leak in vfprintf
4358 [19957] libc: clone(CLONE_VM) access invalid parent memory
4359 [19963] localedata: en_IL: New locale
4360 [19989] stdio: stdio.h cuserid namespace
4361 [19994] network: getaddrinfo does not restore RES_USE_INET6 flag in
4363 [19996] locale: langinfo.h nl_langinfo_l namespace
4364 [20005] stdio: fflush on a file opened with fmemopen resets position to 0
4365 [20010] network: getaddrinfo: Stack overflow in hostent translation
4367 [20012] stdio: libio: fmemopen append mode failure
4368 [20014] stdio: stdio.h namespace for pre-threads POSIX
4369 [20017] network: resolv: Use gmtime_r instead of gmtime in p_secstodate
4370 [20023] libc: fcntl.h timespec namespace
4371 [20024] math: [x86_64] vectorized sincos trashes the stack
4372 [20031] network: nss_hesiod: Heap overflow in get_txt_records
4373 [20041] time: sys/time.h timespec namespace
4374 [20043] libc: unistd.h missing cuserid for UNIX98 and before
4375 [20044] libc: unistd.h missing pthread_atfork for UNIX98
4376 [20051] libc: ttyslot in wrong header under wrong conditions
4377 [20054] libc: gethostname not declared for XPG4
4378 [20055] libc: termios.h missing tcgetsid for XPG4
4379 [20072] dynamic-link: x86 init_cpu_features is called twice in static
4381 [20073] libc: sys/stat.h fchmod namespace
4382 [20074] libc: stdlib.h rand_r namespace
4383 [20076] libc: sys/stat.h missing S_IFSOCK, S_ISSOCK for XPG4
4384 [20094] libc: stdlib.h should not declare grantpt, ptsname, unlockpt for
4386 [20111] libc: struct sockaddr_storage cannot be aggregate-copied
4387 [20112] network: sunrpc: stack (frame) overflow in Sun RPC clntudp_call
4389 [20115] string: Extra alignment in memset-vec-unaligned-erms.S
4390 [20119] libc: Wrong mask for processors level type from CPUID
4391 [20139] dynamic-link: Upper part of zmm is zeroed if Glibc is built with
4392 AS not supporting AVX512
4393 [20151] math: [ldbl-128/ldbl-128ibm] j0l, j1l, y0l, y1l return sNaN for
4395 [20153] math: [ldbl-128ibm] sqrtl (sNaN) returns sNaN
4396 [20156] math: [ldbl-128ibm] ceill, rintl etc. return sNaN for sNaN
4398 [20157] math: [powerpc] fabsl (sNaN) wrongly raises "invalid"
4399 [20160] math: [powerpc] ceil, rint etc. return sNaN for sNaN input
4400 [20178] libc: posix_spawn{p} should not call exit
4401 [20191] stdio: libio: vtables hardening
4402 [20195] string: FMA4 detection requires CPUID execution with register
4404 [20198] libc: quick_exit incorrectly destroys C++11 thread objects.
4405 [20205] math: [i386/x86_64] nextafterl incorrect incrementing negative
4407 [20212] math: acos (sNaN) returns sNaN
4408 [20213] math: asin (sNaN) returns sNaN
4409 [20214] network: Linux header sync with linux/in6.h and ipv6.h again.
4410 [20218] math: [i386] asinhl (sNaN) returns sNaN
4411 [20219] math: [i386] atanhl (sNaN) returns sNaN
4412 [20222] stdio: fopencookie: Mangle function pointers
4413 [20224] math: [i386] cbrtl (sNaN) returns sNaN
4414 [20225] math: ldexp, scalbn, scalbln return sNaN for sNaN input
4415 [20226] math: [i386/x86_64] expl, exp10l, expm1l return sNaN for sNaN
4417 [20227] math: [i386/x86_64] logl (sNaN) returns sNaN
4418 [20228] math: [i386/x86_64] log10l (sNaN) returns sNaN
4419 [20229] math: [i386/x86_64] log1pl (sNaN) returns sNaN
4420 [20232] math: [ldbl-128] expm1l (sNaN) returns sNaN
4421 [20233] math: [ldbl-128ibm] expm1l (sNaN) returns sNaN
4422 [20234] math: [ldbl-128ibm] log1pl (sNaN) returns sNaN
4423 [20235] math: [i386/x86_64] log2l (sNaN) returns sNaN
4424 [20237] nss: nss_db: get*ent segfaults without preceding set*ent
4425 [20240] math: modf (sNaN) returns sNaN
4426 [20248] libc: debug/tst-longjump_chk2 calls printf from a signal handler
4427 [20250] math: frexp (sNaN) returns sNaN
4428 [20252] math: atan2 (sNaN, qNaN) fails to raise "invalid"
4429 [20255] math: [i386] fdim, fdimf return with excess range and precision /
4431 [20256] math: [i386/x86_64] fdiml returns sNaN for sNaN input
4432 [20260] string: ../sysdeps/x86/bits/string.h:1092:3: error: array
4433 subscript is below array bounds [-Werror=array-bounds]
4434 [20262] nis: _nss_nis_initgroups_dyn always returns NSS_STATUS_NOTFOUND
4435 [20263] nptl: robust mutex deadlocks if other thread requests timedlock
4437 [20277] libc: $dp is not initialized correctly in sysdeps/hppa/start.S
4438 [20284] malloc: malloc: Corrupt arena avoidance causes unnecessary mmap
4440 [20296] math: [i386/x86_64] scalbl returns sNaN for sNaN input, missing
4441 "invalid" exceptions
4442 [20314] nptl: make[4]: *** [/usr/include/stdlib.h] Error 1
4443 [20316] localedata: id_ID: Februari instead of Pebruari
4444 [20327] string: POWER8 strcasecmp returns incorrect result
4445 [20347] math: Failure: Test: j0_downward (0xap+0)
4446 [20348] libc: FAIL: misc/tst-preadvwritev64
4447 [20349] libc: 64-bit value is passed differently in p{readv,writev}{64}
4448 [20350] libc: There is no test for p{read,write}64
4449 [20357] math: Incorrect cos result for 1.5174239687223976
4450 [20384] build: Don't run libmvec-sincos-avx* tests on non avx machines
4454 * Unicode 8.0.0 Support: Character encoding, character type info, and
4455 transliteration tables are all updated to Unicode 8.0.0, using new
4456 and/or improved generator scripts contributed by Mike FABIAN (Red Hat).
4457 These updates cause user visible changes, such as the fixes for bugs
4458 89, 16061, and 18568.
4460 * sched_setaffinity, pthread_setaffinity_np no longer attempt to guess the
4461 kernel-internal CPU set size. This means that requests that change the
4462 CPU affinity which failed before (for example, an all-ones CPU mask) will
4463 now succeed. Applications that need to determine the effective CPU
4464 affinities need to call sched_getaffinity or pthread_getaffinity_np after
4465 setting it because the kernel can adjust it (and the previous size check
4466 would not detect this in the majority of cases).
4468 * The fts.h header can now be used with -D_FILE_OFFSET_BITS=64. With LFS
4469 the following new symbols are used: fts64_children, fts64_close,
4470 fts64_open, fts64_read and fts64_set.
4472 * getaddrinfo now detects certain invalid responses on an internal netlink
4473 socket. If such responses are received, an affected process will
4474 terminate with an error message of "Unexpected error <number> on netlink
4475 descriptor <number>" or "Unexpected netlink response of size <number> on
4476 descriptor <number>". The most likely cause for these errors is a
4477 multi-threaded application which erroneously closes and reuses the netlink
4478 file descriptor while it is used by getaddrinfo.
4480 * A defect in the malloc implementation, present since glibc 2.15 (2012) or
4481 glibc 2.10 via --enable-experimental-malloc (2009), could result in the
4482 unnecessary serialization of memory allocation requests across threads.
4483 The defect is now corrected. Users should see a substantial increase in
4484 the concurrent throughput of allocation requests for applications which
4485 trigger this bug. Affected applications typically create and
4486 destroy threads frequently. (Bug 19048 was reported and analyzed by
4489 * There is now a --disable-timezone-tools configure option for disabling the
4490 building and installing of the timezone related utilities (zic, zdump, and
4491 tzselect). This is useful for people who build the timezone data and code
4492 independent of the GNU C Library.
4494 * The obsolete header <regexp.h> has been removed. Programs that require
4495 this header must be updated to use <regex.h> instead.
4497 * The obsolete functions bdflush, create_module, get_kernel_syms,
4498 query_module and uselib are no longer available to newly linked binaries;
4499 the header <sys/kdaemon.h> has been removed. These functions and header
4500 were specific to systems using the Linux kernel and could not usefully be
4501 used with the GNU C Library on systems with version 2.6 or later of the
4504 * Optimized string, wcsmbs and memory functions for IBM z13.
4505 Implemented by Stefan Liebler.
4507 * Newly linked programs that define a variable called signgam will no longer
4508 have it set by the lgamma, lgammaf and lgammal functions. Programs that
4509 require signgam to be set by those functions must ensure that they use the
4510 variable provided by the GNU C Library and declared in <math.h>, without
4511 defining their own copy.
4513 * The minimum GCC version that can be used to build this version of the GNU
4514 C Library is GCC 4.7. Older GCC versions, and non-GNU compilers, can
4515 still be used to compile programs using the GNU C Library.
4517 Security related changes:
4519 * An out-of-bounds value in a broken-out struct tm argument to strftime no
4520 longer causes a crash. Reported by Adam Nielsen. (CVE-2015-8776)
4522 * The LD_POINTER_GUARD environment variable can no longer be used to disable
4523 the pointer guard feature. It is always enabled. Previously,
4524 LD_POINTER_GUARD could be used to disable security hardening in binaries
4525 running in privileged AT_SECURE mode. Reported by Hector Marco-Gisbert.
4528 * An integer overflow in hcreate and hcreate_r could lead to an
4529 out-of-bounds memory access. Reported by Szabolcs Nagy. (CVE-2015-8778)
4531 * The catopen function no longer has unbounded stack usage. Reported by
4532 Max. (CVE-2015-8779)
4534 * The nan, nanf and nanl functions no longer have unbounded stack usage
4535 depending on the length of the string passed as an argument to the
4536 functions. Reported by Joseph Myers. (CVE-2014-9761)
4538 * A stack-based buffer overflow was found in libresolv when invoked from
4539 libnss_dns, allowing specially crafted DNS responses to seize control
4540 of execution flow in the DNS client. The buffer overflow occurs in
4541 the functions send_dg (send datagram) and send_vc (send TCP) for the
4542 NSS module libnss_dns.so.2 when calling getaddrinfo with AF_UNSPEC
4543 family. The use of AF_UNSPEC triggers the low-level resolver code to
4544 send out two parallel queries for A and AAAA. A mismanagement of the
4545 buffers used for those queries could result in the response of a query
4546 writing beyond the alloca allocated buffer created by
4547 _nss_dns_gethostbyname4_r. Buffer management is simplified to remove
4548 the overflow. Thanks to the Google Security Team and Red Hat for
4549 reporting the security impact of this issue, and Robert Holiday of
4550 Ciena for reporting the related bug 18665. (CVE-2015-7547)
4552 The following bugs are resolved with this release:
4554 [89] localedata: Locales nb_NO and nn_NO should transliterate æøå
4555 [887] math: Math library function "logb" and "nextafter" inconsistent
4556 [2542] math: Incorrect return from float gamma (-0X1.FA471547C2FE5P+1)
4557 [2543] math: Incorrect return from float gamma (-0X1.9260DCP+1)
4558 [2558] math: Incorrect return from double gamma (-0X1.FA471547C2FE5P+1)
4559 [2898] libc: [improve] warning: the use of `mktemp' is dangerous, better
4561 [4404] localedata: German translation of "Alarm clock" is misleading
4562 [6799] math: nextafter() and nexttoward() doesn't set errno on
4563 overflow/underflow errors
4564 [6803] math: scalb(), scalbln(), scalbn() do not set errno on
4566 [10432] nis: _nss_nis_setnetgrent assertion failure
4567 [11460] libc: fts has no LFS support
4568 [12926] network: getaddrinfo()/make_request() may spin forever
4569 [13065] nptl: Race condition in pthread barriers
4570 [13690] nptl: pthread_mutex_unlock potentially cause invalid access
4571 [14341] dynamic-link: Dynamic linker crash when DT_JMPREL and DT_REL{,A}
4573 [14551] math: [ldbl-128ibm] strtold overflow handling for IBM long double
4574 [14912] libc: Rename non-installed bits/*.h headers
4575 [15002] libc: Avoid undefined behavior in posix_fallocate overflow check
4576 [15367] math: Let gcc use __builtin_isinf
4577 [15384] math: One constant fewer in ieee754/dbl-64/wordsize-64/s_finite.c
4578 [15421] math: lgamma wrongly sets signgam for ISO C
4579 [15470] math: [arm] On ARM llrintl() and llroundl() do not raise
4580 FE_INVALID with argument out of range
4581 [15491] math: [i386/x86_64] x86 nearbyint implementations wrongly clear
4583 [15786] dynamic-link: ifunc resolver functions can smash function
4585 [15918] math: Unnecessary check for equality in hypotf()
4586 [16061] localedata: Review / update transliteration data
4587 [16068] math: [i386/x86_64] x86 and x86_64 fesetenv exclude state they
4589 [16141] time: strptime %z offset restriction
4590 [16171] math: drem should be alias of remainder
4591 [16296] math: fegetround is pure?
4592 [16347] math: [ldbl-128ibm] ldbl-128/e_lgammal_r.c may not be suitable.
4593 [16364] libc: sleep may leave SIGCHLD blocked on sync cancellation on
4595 [16399] math: [mips] lrint / llrint / lround / llround missing exceptions
4596 [16415] math: Clean up ldbl-128 / ldbl-128ibm expm1l for large positive
4598 [16422] math: [powerpc] math-float, math-double failing llrint tests with
4599 "Exception "Inexact" set" on ppc32
4600 [16495] localedata: nl_NL: date_fmt: shuffle year/month around
4601 [16517] math: Missing underflow exception from tanf/tan/tanl
4602 [16519] math: Missing underflow exception from sinhf
4603 [16520] math: Missing underflow exception from tanhf
4604 [16521] math: Missing underflow exception from exp2
4605 [16620] math: [ldbl-128ibm] exp10l spurious overflows / bad directed
4607 [16734] stdio: fopen calls mmap to allocate its buffer
4608 [16961] math: nan function incorrect handling of bad sequences
4609 [16962] math: nan function unbounded stack allocation (CVE-2014-9761)
4610 [16973] localedata: Fix lang_lib/lang_term as per ISO 639-2
4611 [16985] locale: localedef: confusing error message when opening output
4613 [17118] math: ctanh(INFINITY + 2 * I) returns incorrect value
4614 [17197] locale: Redundant shift character in iconv conversion output at
4616 [17243] libc: trunk/posix/execl.c:53: va_args problem ?
4617 [17244] libc: trunk/sysdeps/unix/sysv/linux/semctl.c:116: va_args muxup ?
4618 [17250] dynamic-link: static linking breaks nss loading
4619 (getaddrinfo/getpwnam/etc...)
4620 [17404] libc: atomic_exchange_rel lacking a barrier on MIPS16, GCC before
4622 [17441] math: isnan() should use __builtin_isnan() in GCC
4623 [17514] nptl: Assert failure unlocking ERRORCHECK mutex after timedlock
4624 (related to lock elision)
4625 [17787] manual: Exponent on page 324 of the PDF ends prematurely
4626 [17886] time: strptime should be able to parse "Z" as a timezone with %z
4627 [17887] time: strptime should be able to parse "+01:00" style timezones
4628 [17905] libc: catopen() Multiple unbounded stack allocations
4630 [18084] libc: backtrace (..., 0) dumps core on x86
4631 [18086] libc: nice() sets errno to 0 on success
4632 [18240] libc: hcreate, hcreate_r should fail with ENOMEM if element count
4633 is too large (CVE-2015-8778)
4634 [18251] dynamic-link: SONAME missing when audit modules provides path
4635 [18265] libc: add attributes for wchar string and memory functions
4636 [18370] math: csqrt missing underflows
4637 [18421] libc: [hppa] read-only segment has dynamic relocations
4638 [18472] libc: Obsolete syscall wrappers should be compat symbols
4639 [18480] libc: hppa glibc miscompilation in sched_setaffinity()
4640 [18491] localedata: Update tr_TR LC_CTYPE as part of Unicode updates
4641 [18525] localedata: Remove locale timezone information
4642 [18560] libc: [powerpc] spurious bits/ipc.h definitions
4643 [18568] localedata: Update locale data to Unicode 8.0
4644 [18589] locale: sort-test.sh fails at random
4645 [18595] math: ctan, ctanh missing underflows
4646 [18604] libc: assert macro-expands its argument
4647 [18610] math: S390: fetestexcept() reports any exception if DXC-code
4648 contains a vector instruction exception.
4649 [18611] math: j1, jn missing errno setting on underflow
4650 [18618] localedata: sync Chechen locale definitions with other *_RU
4652 [18647] math: powf(-0x1.000002p0, 0x1p30) returns 0 instead of +inf
4653 [18661] libc: Some x86-64 assembly codes don't align stack to 16 bytes
4654 [18665] network: In send_dg, the recvfrom function is NOT always using the
4655 buffer size of a newly created buffer (CVE-2015-7547)
4656 [18674] libc: [i386] trunk/sysdeps/i386/tst-auditmod3b.c:84: possible
4658 [18675] libc: fpathconf(_PC_NAME_MAX) fails against large filesystems for
4660 [18681] libc: regexp.h is obsolete and buggy, and should be desupported
4661 [18699] math: tilegx cproj() for various complex infinities does not yield
4663 [18724] libc: Harden put*ent functions against data injection
4664 [18743] nptl: PowerPC: findutils testcase fails with --enable-lock-elision
4665 [18755] build: build errors with -DNDEBUG
4666 [18757] stdio: fmemopen fails to set errno on failure
4667 [18778] dynamic-link: ld.so crashes if failed dlopen causes libpthread to
4669 [18781] libc: openat64 lacks O_LARGEFILE
4670 [18787] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/atomic.h:71:6:
4671 error: can’t find a register in class ‘R1_REGS’ while reloading ‘asm’
4672 [18789] math: [ldbl-128ibm] sinhl inaccurate near 0
4673 [18790] math: [ldbl-128ibm] tanhl inaccurate
4674 [18795] libc: stpncpy fortification misses buffer lengths that are
4675 statically too large
4676 [18796] build: build fails for --disable-mathvec
4677 [18803] math: hypot missing underflows
4678 [18820] stdio: fmemopen may leak memory on failure
4679 [18823] math: csqrt spurious underflows
4680 [18824] math: fma spurious underflows
4681 [18825] math: pow missing underflows
4682 [18857] math: [ldbl-128ibm] nearbyintl wrongly uses signaling comparisons
4683 [18868] nptl: pthread_barrier_init typo has in-theory-undefined behavior
4684 [18870] build: sem_open.c fails to compile with missing symbol
4686 [18872] stdio: Fix memory leak in printf_positional
4687 [18873] libc: posix_fallocate overflow check ineffective
4688 [18875] math: Excess precision leads incorrect libm
4689 [18877] libc: arm: mmap offset regression
4690 [18887] libc: memory corruption when using getmntent on blank lines
4691 [18918] localedata: hu_HU: change time to HH:MM:SS format
4692 [18921] libc: Regression: extraneous stat() and fstat() performed by
4694 [18928] dynamic-link: LD_POINTER_GUARD is not ignored for privileged
4695 binaries (CVE-2015-8777)
4696 [18951] math: tgamma missing underflows
4697 [18952] math: [ldbl-128/ldbl-128ibm] lgammal spurious "invalid", incorrect
4699 [18953] localedata: lt_LT: change currency symbol to the euro
4700 [18956] math: powf inaccuracy
4701 [18961] math: [i386] exp missing underflows
4702 [18966] math: [i386] exp10 missing underflows
4703 [18967] math: math.h XSI POSIX namespace (gamma, isnan, scalb)
4704 [18969] build: multiple string test failures due to missing locale
4706 [18970] libc: Reference of pthread_setcancelstate in libc.a
4707 [18977] math: float / long double Bessel functions not in XSI POSIX
4708 [18980] math: i386 libm functions return with excess range and precision
4709 [18981] math: i386 scalb*, ldexp return with excess range and precision
4710 [18982] stdio: va_list and vprintf
4711 [18985] time: Passing out of range data to strftime() causes a segfault
4713 [19003] math: [x86_64] fma4 version of pow inappropriate contraction
4714 [19007] libc: FAIL: elf/check-localplt with -z now and binutils 2.26
4715 [19012] locale: iconv_open leaks memory on error path
4716 [19016] math: clog, clog10 inaccuracy
4717 [19018] nptl: Mangle function pointers in tls_dtor_list
4718 [19032] math: [i386] acosh (-qNaN) spurious "invalid" exception
4719 [19046] math: ldbl-128 / ldbl-128ibm lgamma bad overflow handling
4720 [19048] malloc: malloc: arena free list can become cyclic, increasing
4722 [19049] math: [powerpc] erfc incorrect zero sign
4723 [19050] math: [powerpc] log* incorrect zero sign
4724 [19058] math: [x86_64] Link fail with -fopenmp and -flto
4725 [19059] math: nexttoward overflow incorrect in non-default rounding modes
4726 [19071] math: ldbl-96 lroundl incorrect just below powers of 2
4727 [19074] network: Data race in _res_hconf_reorder_addrs
4728 [19076] math: [ldbl-128ibm] log1pl (-1) wrong sign of infinity
4729 [19077] math: [ldbl-128ibm] logl (1) incorrect sign of zero result
4730 [19078] math: [ldbl-128ibm] expl overflow incorrect in non-default
4732 [19079] math: dbl-64/wordsize-64 lround based on llround incorrect for
4734 [19085] math: ldbl-128 lrintl, lroundl missing exceptions for 32-bit long
4735 [19086] manual: posix_fallocate64 documented argument order is wrong.
4736 [19088] math: lround, llround missing exceptions close to overflow
4738 [19094] math: lrint, llrint missing exceptions close to overflow threshold
4739 [19095] math: dbl-64 lrint incorrect for 64-bit long
4740 [19122] dynamic-link: Unnecessary PLT relocations in librtld.os
4741 [19124] dynamic-link: ld.so failed to build with older assembler
4742 [19125] math: [powerpc32] llroundf, llround incorrect exceptions
4743 [19129] dynamic-link: [arm] Concurrent lazy TLSDESC resolution can crash
4744 [19134] math: [powerpc32] lround, lroundf spurious exceptions
4745 [19137] libc: i386/epoll_pwait.S doesn't support cancellation
4746 [19143] nptl: Remove CPU set size checking from sched_setaffinity,
4747 pthread_setaffinity_np
4748 [19156] math: [ldbl-128] j0l spurious underflows
4749 [19164] nptl: tst-getcpu fails with many possible CPUs
4750 [19168] math: math/test-ildoubl and math/test-ldouble failure
4751 [19174] nptl: PowerPC: TLE enabled pthread mutex performs poorly.
4752 [19178] dynamic-link: ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA confuses
4754 [19181] math: [i386/x86_64] fesetenv (FE_DFL_ENV), fesetenv
4755 (FE_NOMASK_ENV) do not clear SSE exceptions
4756 [19182] malloc: malloc deadlock between ptmalloc_lock_all and
4757 _int_new_arena/reused_arena
4758 [19189] math: [ldbl-128] log1pl (-qNaN) spurious "invalid" exception
4759 [19201] math: dbl-64 remainder incorrect sign of zero result
4760 [19205] math: bits/math-finite.h conditions do not match math.h and
4762 [19209] math: bits/math-finite.h wrongly maps ldexp to scalbn
4763 [19211] math: lgamma functions do not set signgam for -ffinite-math-only
4764 for C99-based standards
4765 [19212] libc: features.h not -Wundef clean
4766 [19213] math: [i386/x86_64] log* (1) incorrect zero sign for -ffinite-
4768 [19214] libc: Family and model identification for AMD CPU's are incorrect.
4769 [19219] libc: GLIBC build fails for ia64 with missing __nearbyintl
4770 [19228] math: [powerpc] nearbyint wrongly clears "inexact", leaves traps
4772 [19235] math: [powerpc64] lround, lroundf, llround, llroundf spurious
4773 "inexact" exceptions
4774 [19238] math: [powerpc] round, roundf spurious "inexact" for integer
4776 [19242] libc: strtol incorrect in Turkish locales
4777 [19243] malloc: reused_arena can pick an arena on the free list, leading
4778 to an assertion failure and reference count corruption
4779 [19253] time: tzset() ineffective when temporary TZ did not include DST
4781 [19266] math: strtod ("NAN(I)") incorrect in Turkish locales
4782 [19270] math: [hppa] Shared libm missing __isnanl
4783 [19285] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/mman.h: missing
4784 MAP_HUGETLB and MAP_STACK defines
4785 [19313] nptl: Wrong __cpu_mask for x32
4786 [19347] libc: grantpt: try to force a specific gid even without pt_chown
4787 [19349] math: [ldbl-128ibm] tanhl inaccurate for small arguments
4788 [19350] math: [ldbl-128ibm] sinhl spurious overflows
4789 [19351] math: [ldbl-128ibm] logl inaccurate near 1
4790 [19363] time: x32: times() return value wrongly truncates/sign extends
4792 [19367] dynamic-link: Improve branch prediction on Silvermont
4793 [19369] network: Default domain name not reset by res_ninit when "search"
4794 / "domain" entry is removed from resolv.conf
4795 [19375] math: powerpc: incorrect results for POWER7 logb with negative
4797 [19385] localedata: bg_BG: time separator should be colon, not comma
4798 [19408] libc: linux personality syscall wrapper may erroneously return an
4799 error on 32-bit architectures
4800 [19415] libc: dladdr returns wrong names on hppa
4801 [19432] libc: iconv rejects redundant escape sequences in IBM900, IBM903,
4802 IBM905, IBM907, and IBM909
4803 [19439] math: Unix98 isinf and isnan functions conflict with C++11
4804 [19443] build: build failures with -DDEBUG
4805 [19451] build: Make check fails on test-double-vlen2
4806 [19462] libc: Glibc failed to build with -Os
4807 [19465] math: Wrong code with -Os
4808 [19466] time: time/tst-mktime2.c is compiled into an infinite loop with
4810 [19467] string: Fast_Unaligned_Load needs to be enabled for Excavator core
4812 [19475] libc: Glibc 2.22 doesn't build on sparc [PATCH]
4813 [19486] math: S390: Math tests fail with "Exception Inexact set".
4814 [19529] libc: [ARM]: FAIL: stdlib/tst-makecontext
4815 [19550] libc: [mips] mmap negative offset handling inconsistent with other
4817 [19590] math: Fail to build shared objects that use libmvec.so functions.
4821 * The following bugs are resolved with this release:
4823 438, 2981, 4719, 6544, 6792, 11216, 12836, 13028, 13064, 13151, 13152,
4824 14094, 14113, 14292, 14841, 14906, 14958, 15319, 15467, 15790, 15969,
4825 16159, 16339, 16350, 16351, 16352, 16353, 16361, 16512, 16526, 16538,
4826 16559, 16560, 16704, 16783, 16850, 17053, 17090, 17195, 17269, 17293,
4827 17322, 17403, 17475, 17523, 17542, 17569, 17581, 17588, 17596, 17620,
4828 17621, 17628, 17631, 17692, 17711, 17715, 17776, 17779, 17792, 17833,
4829 17836, 17841, 17912, 17916, 17930, 17932, 17944, 17949, 17964, 17965,
4830 17967, 17969, 17977, 17978, 17987, 17991, 17996, 17998, 17999, 18007,
4831 18019, 18020, 18029, 18030, 18032, 18034, 18036, 18038, 18039, 18042,
4832 18043, 18046, 18047, 18049, 18068, 18078, 18080, 18093, 18100, 18104,
4833 18110, 18111, 18116, 18125, 18128, 18134, 18138, 18185, 18196, 18197,
4834 18206, 18210, 18211, 18217, 18219, 18220, 18221, 18234, 18244, 18245,
4835 18247, 18287, 18319, 18324, 18333, 18346, 18371, 18383, 18397, 18400,
4836 18409, 18410, 18412, 18418, 18422, 18434, 18444, 18457, 18468, 18469,
4837 18470, 18479, 18483, 18495, 18496, 18497, 18498, 18502, 18507, 18508,
4838 18512, 18513, 18519, 18520, 18522, 18527, 18528, 18529, 18530, 18532,
4839 18533, 18534, 18536, 18539, 18540, 18542, 18544, 18545, 18546, 18547,
4840 18549, 18553, 18557, 18558, 18569, 18583, 18585, 18586, 18592, 18593,
4841 18594, 18602, 18612, 18613, 18619, 18633, 18635, 18641, 18643, 18648,
4842 18657, 18676, 18694, 18696, 18887.
4844 * Cache information can be queried via sysconf() function on s390 e.g. with
4845 _SC_LEVEL1_ICACHE_SIZE as argument.
4847 * A buffer overflow in gethostbyname_r and related functions performing DNS
4848 requests has been fixed. If the NSS functions were called with a
4849 misaligned buffer, the buffer length change due to pointer alignment was
4850 not taken into account. This could result in application crashes or,
4851 potentially arbitrary code execution, using crafted, but syntactically
4852 valid DNS responses. (CVE-2015-1781)
4854 * The time zone file parser has been made more robust against crafted time
4855 zone files, avoiding heap buffer overflows related to the processing of
4856 the tzh_ttisstdcnt and tzh_ttisgmtcnt fields, and a stack overflow due to
4857 large time zone data files. Overly long time zone specifiers in the TZ
4858 variable no longer result in stack overflows and crashes.
4860 * A powerpc and powerpc64 optimization for TLS, similar to TLS descriptors
4861 for LD and GD on x86 and x86-64, has been implemented. You will need
4862 binutils-2.24 or later to enable this optimization.
4864 * Character encoding and ctype tables were updated to Unicode 7.0.0, using
4865 new generator scripts contributed by Pravin Satpute and Mike FABIAN (Red
4866 Hat). These updates cause user visible changes, such as the fix for bug
4869 * CVE-2014-8121 The NSS backends shared internal state between the getXXent
4870 and getXXbyYY NSS calls for the same database, causing a denial-of-service
4871 condition in some applications.
4873 * Added vector math library named libmvec with the following vectorized x86_64
4874 implementations: cos, cosf, sin, sinf, sincos, sincosf, log, logf, exp, expf,
4876 The library can be disabled with --disable-mathvec. Use of the functions is
4877 enabled with -fopenmp -ffast-math starting from -O1 for GCC version >= 4.9.0.
4878 Shared library libmvec.so is linked in as needed when using -lm (no need to
4879 specify -lmvec explicitly for not static builds).
4880 Visit <https://sourceware.org/glibc/wiki/libmvec> for detailed information.
4882 * A new fmemopen implementation has been added with the goal of POSIX
4883 compliance. The new implementation fixes the following long-standing
4884 issues: BZ#6544, BZ#11216, BZ#12836, BZ#13151, BZ#13152, and BZ#14292. The
4885 old implementation is still present for use be by existing binaries.
4887 * The 32-bit sparc sigaction ABI was inadvertently broken in the 2.20 and 2.21
4888 releases. It has been fixed to match 2.19 and older, but binaries built
4889 against 2.20 and 2.21 might need to be recompiled. See BZ#18694.
4891 * Port to Native Client running on ARMv7-A (--host=arm-nacl).
4892 Contributed by Roland McGrath (Google).
4894 * The header <regexp.h> is deprecated, and will be removed in a future
4895 release. Use of this header will trigger a deprecation warning.
4896 Application developers should update their code to use <regex.h> instead.
4898 This header was formerly part of SUS, but was deprecated in 1994 and
4899 removed from the standard in 2001. Also, the glibc implementation
4900 leaks memory. See BZ#18681 for more details.
4904 * The following bugs are resolved with this release:
4906 6652, 10672, 12674, 12847, 12926, 13862, 14132, 14138, 14171, 14498,
4907 15215, 15378, 15884, 16009, 16418, 16191, 16469, 16576, 16617, 16618,
4908 16619, 16657, 16740, 16857, 17192, 17266, 17273, 17344, 17363, 17370,
4909 17371, 17411, 17460, 17475, 17485, 17501, 17506, 17508, 17522, 17555,
4910 17570, 17571, 17572, 17573, 17574, 17582, 17583, 17584, 17585, 17589,
4911 17594, 17601, 17608, 17616, 17625, 17630, 17633, 17634, 17635, 17647,
4912 17653, 17657, 17658, 17664, 17665, 17668, 17682, 17702, 17717, 17719,
4913 17722, 17723, 17724, 17725, 17732, 17733, 17744, 17745, 17746, 17747,
4914 17748, 17775, 17777, 17780, 17781, 17782, 17791, 17793, 17796, 17797,
4915 17801, 17803, 17806, 17834, 17844, 17848, 17868, 17869, 17870, 17885,
4918 * CVE-2015-1472 CVE-2015-1473 Under certain conditions wscanf can allocate
4919 too little memory for the to-be-scanned arguments and overflow the
4920 allocated buffer. The implementation now correctly computes the required
4921 buffer size when using malloc, and switches to malloc from alloca as
4924 * A new semaphore algorithm has been implemented in generic C code for all
4925 machines. Previous custom assembly implementations of semaphore were
4926 difficult to reason about or ensure that they were safe. The new version
4927 of semaphore supports machines with 64-bit or 32-bit atomic operations.
4928 The new semaphore algorithm is used by sem_init, sem_open, sem_post,
4929 sem_wait, sem_timedwait, sem_trywait, and sem_getvalue.
4931 * Port to Altera Nios II has been contributed by Mentor Graphics.
4933 * Optimized strcpy, stpcpy, strncpy, stpncpy, strcmp, and strncmp
4934 implementations for powerpc64/powerpc64le.
4935 Implemented by Adhemerval Zanella (IBM).
4937 * Added support for TSX lock elision of pthread mutexes on powerpc32, powerpc64
4938 and powerpc64le. This may improve lock scaling of existing programs on
4939 HTM capable systems. The lock elision code is only enabled with
4940 --enable-lock-elision=yes. Also, the TSX lock elision implementation for
4941 powerpc will issue a transaction abort on every syscall to avoid side
4942 effects being visible outside transactions.
4944 * Optimized strcpy, stpcpy, strchrnul and strrchr implementations for
4945 AArch64. Contributed by ARM Ltd.
4947 * i386 memcpy functions optimized with SSE2 unaligned load/store.
4949 * CVE-2104-7817 The wordexp function could ignore the WRDE_NOCMD flag
4950 under certain input conditions resulting in the execution of a shell for
4951 command substitution when the application did not request it. The
4952 implementation now checks WRDE_NOCMD immediately before executing the
4953 shell and returns the error WRDE_CMDSUB as expected.
4955 * CVE-2012-3406 printf-style functions could run into a stack overflow when
4956 processing format strings with a large number of format specifiers.
4958 * CVE-2014-9402 The nss_dns implementation of getnetbyname could run into an
4959 infinite loop if the DNS response contained a PTR record of an unexpected
4962 * The minimum GCC version that can be used to build this version of the GNU
4963 C Library is GCC 4.6. Older GCC versions, and non-GNU compilers, can
4964 still be used to compile programs using the GNU C Library.
4966 * The GNU C Library is now built with -Werror by default. This can be
4967 disabled by configuring with --disable-werror.
4969 * New locales: tu_IN, bh_IN, raj_IN, ce_RU.
4971 * The obsolete sigvec function has been removed. This was the original
4972 4.2BSD interface that inspired the POSIX.1 sigaction interface, which
4973 programs have been using instead for about 25 years. Of course, ABI
4974 compatibility for old binaries using sigvec remains intact.
4976 * Merged gettext 0.19.3 into the intl subdirectory. This fixes building
4977 with newer versions of bison.
4979 * Support for MIPS o32 FPXX, FP64A and FP64 ABI Extensions.
4980 The original MIPS o32 hard-float ABI requires an FPU where double-precision
4981 registers overlay two consecutive single-precision registers. MIPS32R2
4982 introduced a new FPU mode (FR=1) where double-precision registers extend the
4983 corresponding single-precision registers which is incompatible with the
4984 o32 hard-float ABI. The MIPS SIMD ASE and the MIPSR6 architecture both
4985 require the use of FR=1 making a transition necessary. New o32 ABI
4986 extensions enable users to migrate over time from the original o32 ABI
4987 through to the updated o32 FP64 ABI. To achieve this the dynamic linker now
4988 tracks the ABI of any loaded object and verifies that new objects are
4989 compatible. Mode transitions will also be requested as required and
4990 unsupportable objects will be rejected. The ABI checks include both soft and
4991 hard float ABIs for o32, n32 and n64.
4993 GCC 5 with GNU binutils 2.25 onwards:
4994 It is strongly recommended that all o32 system libraries are built using the
4995 new o32 FPXX ABI (-mfpxx) to facilitate the transition as this is compatible
4996 with the original and all new o32 ABI extensions. Configure a MIPS GCC
4997 compiler using --with-fp-32=xx to set this by default.
5001 * The following bugs are resolved with this release:
5003 6804, 9894, 11505, 12994, 13347, 13651, 14308, 14770, 15119, 15132, 15347,
5004 15514, 15698, 15804, 15894, 15946, 16002, 16064, 16095, 16194, 16198,
5005 16275, 16284, 16287, 16315, 16348, 16349, 16354, 16357, 16362, 16447,
5006 16516, 16532, 16539, 16545, 16561, 16562, 16564, 16574, 16599, 16600,
5007 16609, 16610, 16611, 16613, 16619, 16623, 16629, 16632, 16634, 16639,
5008 16642, 16648, 16649, 16670, 16674, 16677, 16680, 16681, 16683, 16689,
5009 16695, 16701, 16706, 16707, 16712, 16713, 16714, 16724, 16731, 16739,
5010 16740, 16743, 16754, 16758, 16759, 16760, 16770, 16786, 16789, 16791,
5011 16796, 16799, 16800, 16815, 16823, 16824, 16831, 16838, 16839, 16849,
5012 16854, 16876, 16877, 16878, 16882, 16885, 16888, 16890, 16892, 16912,
5013 16915, 16916, 16917, 16918, 16922, 16927, 16928, 16932, 16943, 16958,
5014 16965, 16966, 16967, 16977, 16978, 16984, 16990, 16996, 17009, 17022,
5015 17031, 17042, 17048, 17050, 17058, 17061, 17062, 17069, 17075, 17078,
5016 17079, 17084, 17086, 17088, 17092, 17097, 17125, 17135, 17137, 17150,
5017 17153, 17187, 17213, 17259, 17261, 17262, 17263, 17319, 17325, 17354.
5019 * Reverted change of ABI data structures for s390 and s390x:
5020 On s390 and s390x the size of struct ucontext and jmp_buf was increased in
5021 2.19. This change is reverted in 2.20. The introduced 2.19 symbol versions
5022 of getcontext, setjmp, _setjmp, __sigsetjmp, longjmp, _longjmp, siglongjmp
5023 are preserved pointing straight to the same implementation as the old ones.
5024 Given that, new callers will simply provide a too-big buffer to these
5025 functions. Any applications/libraries out there that embed jmp_buf or
5026 ucontext_t in an ABI-relevant data structure that have already been rebuilt
5027 against 2.19 headers will have to rebuilt again. This is necessary in any
5028 case to revert the breakage in their ABI caused by the glibc change.
5030 * Support for file description locks is added to systems running the
5031 Linux kernel. The standard file locking interfaces are extended to
5032 operate on file descriptions, not file descriptors, via the use of
5033 F_OFD_GETLK, F_OFD_SETLK, and F_OFD_SETLKW. File description locks
5034 are associated with an open file instead of a process.
5036 * Optimized strchr implementation for AArch64. Contributed by ARM Ltd.
5038 * The minimum Linux kernel version that this version of the GNU C Library
5039 can be used with is 2.6.32.
5041 * Running the testsuite no longer terminates as soon as a test fails.
5042 Instead, a file tests.sum (xtests.sum from "make xcheck") is generated,
5043 with PASS or FAIL lines for individual tests. A summary of the results is
5044 printed, including a list of failing lists, and "make check" exits with
5045 error status if there were any unexpected failures. "make check
5046 stop-on-test-failure=y" may be used to keep the old behavior.
5048 * The am33 port, which had not worked for several years, has been removed
5051 * The _BSD_SOURCE and _SVID_SOURCE feature test macros are no longer
5052 supported; they now act the same as _DEFAULT_SOURCE (but generate a
5053 warning). Except for cases where _BSD_SOURCE enabled BSD interfaces that
5054 conflicted with POSIX (support for which was removed in 2.19), the
5055 interfaces those macros enabled remain available when compiling with
5056 _GNU_SOURCE defined, with _DEFAULT_SOURCE defined, or without any feature
5057 test macros defined.
5059 * Optimized strcmp implementation for ARMv7. Contributed by ARM Ltd.
5061 * Added support for TX lock elision of pthread mutexes on s390 and s390x.
5062 This may improve lock scaling of existing programs on TX capable systems.
5063 The lock elision code is only built with --enable-lock-elision=yes and
5064 then requires a GCC version supporting the TX builtins. With lock elision
5065 default mutexes are elided via __builtin_tbegin, if the cpu supports
5066 transactions. By default lock elision is not enabled and the elision code
5069 * CVE-2014-4043 The posix_spawn_file_actions_addopen implementation did not
5070 copy the path argument. This allowed programs to cause posix_spawn to
5071 deference a dangling pointer, or use an unexpected pathname argument if
5072 the string was modified after the posix_spawn_file_actions_addopen
5075 * All supported architectures now use the main glibc sysdeps directory
5076 instead of some being in a separate "ports" directory (which was
5077 distributed separately before glibc 2.17).
5079 * The NPTL implementation of POSIX pthreads is no longer an "add-on".
5080 On configurations that support it (all Linux configurations), it's now
5081 used regardless of the --enable-add-ons switch to configure. It is no
5082 longer possible to build such configurations without pthreads support.
5084 * Locale names, including those obtained from environment variables (LANG
5085 and the LC_* variables), are more tightly checked for proper syntax.
5086 setlocale will now fail (with EINVAL) for locale names that are overly
5087 long, contain slashes without starting with a slash, or contain ".." path
5088 components. (CVE-2014-0475) Previously, some valid locale names were
5089 silently replaced with the "C" locale when running in AT_SECURE mode
5090 (e.g., in a SUID program). This is no longer necessary because of the
5093 * On x86-64, the dynamic linker's lazy-binding support is now compatible
5094 with application code using Intel MPX instructions. (With all previous
5095 versions, the MPX register state could be clobbered when making calls
5096 into or out of a shared library.) Note that while the new dynamic
5097 linker is compatible with all known x86 hardware whether or not it
5098 supports Intel MPX, some x86 instruction-set emulators might fail to
5099 handle the new instruction encodings. This is known to affect Valgrind
5100 versions up through 3.9 (but will be fixed in the forthcoming 3.10
5101 release), and might affect other tools that do instruction emulation.
5103 * Support for loadable gconv transliteration modules has been removed.
5104 The support for transliteration modules has been non-functional for
5105 over a decade, and the removal is prompted by security defects. The
5106 normal gconv conversion modules are still supported. Transliteration
5107 with //TRANSLIT is still possible, and the //IGNORE specifier
5108 continues to be supported. (CVE-2014-5119)
5110 * Decoding a crafted input sequence in the character sets IBM933, IBM935,
5111 IBM937, IBM939, IBM1364 could result in an out-of-bounds array read,
5112 resulting a denial-of-service security vulnerability in applications which
5113 use functions related to iconv. (CVE-2014-6040)
5117 * The following bugs are resolved with this release:
5119 156, 387, 431, 762, 832, 926, 2801, 4772, 6786, 6787, 6807, 6810, 6981,
5120 7003, 9721, 9954, 10253, 10278, 11087, 11157, 11214, 12100, 12486, 12751,
5121 12986, 13028, 13982, 13985, 14029, 14032, 14120, 14143, 14155, 14286,
5122 14547, 14699, 14752, 14782, 14876, 14910, 15004, 15048, 15073, 15089,
5123 15128, 15218, 15268, 15277, 15308, 15362, 15374, 15400, 15425, 15427,
5124 15483, 15522, 15531, 15532, 15593, 15601, 15608, 15609, 15610, 15632,
5125 15640, 15670, 15672, 15680, 15681, 15723, 15734, 15735, 15736, 15748,
5126 15749, 15754, 15760, 15763, 15764, 15797, 15799, 15825, 15843, 15844,
5127 15846, 15847, 15849, 15850, 15855, 15856, 15857, 15859, 15867, 15886,
5128 15887, 15890, 15892, 15893, 15895, 15897, 15901, 15905, 15909, 15915,
5129 15917, 15919, 15921, 15923, 15939, 15941, 15948, 15963, 15966, 15968,
5130 15985, 15988, 15997, 16032, 16034, 16036, 16037, 16038, 16041, 16046,
5131 16055, 16071, 16072, 16074, 16077, 16078, 16103, 16112, 16143, 16144,
5132 16146, 16150, 16151, 16153, 16167, 16169, 16172, 16195, 16214, 16245,
5133 16271, 16274, 16283, 16289, 16293, 16314, 16316, 16330, 16337, 16338,
5134 16356, 16365, 16366, 16369, 16372, 16375, 16379, 16381, 16384, 16385,
5135 16386, 16387, 16390, 16394, 16398, 16400, 16407, 16408, 16414, 16430,
5136 16431, 16453, 16474, 16506, 16510, 16529
5138 * Slovenian translations for glibc messages have been contributed by the
5139 Translation Project's Slovenian team of translators.
5141 * The public headers no longer use __unused nor __block. This change is to
5142 support compiling programs that are derived from BSD sources and use
5143 __unused internally, and to support compiling with Clang's -fblock
5144 extension which uses __block.
5146 * CVE-2012-4412 The strcoll implementation caches indices and rules for
5147 large collation sequences to optimize multiple passes. This cache
5148 computation may overflow for large collation sequences and may cause a
5149 stack or buffer overflow. This is now fixed to use a slower algorithm
5150 which does not use a cache if there is an integer overflow.
5152 * CVE-2012-4424 The strcoll implementation uses malloc to cache indices and
5153 rules for large collation sequences to optimize multiple passes and falls
5154 back to alloca if malloc fails, resulting in a possible stack overflow.
5155 The implementation now falls back to an uncached collation sequence lookup
5158 * CVE-2013-4788 The pointer guard used for pointer mangling was not
5159 initialized for static applications resulting in the security feature
5160 being disabled. The pointer guard is now correctly initialized to a
5161 random value for static applications. Existing static applications need
5162 to be recompiled to take advantage of the fix (bug 15754).
5164 * CVE-2013-4237 The readdir_r function could write more than NAME_MAX bytes
5165 to the d_name member of struct dirent, or omit the terminating NUL
5166 character. (Bugzilla #14699).
5168 * CVE-2013-4332 The pvalloc, valloc, memalign, posix_memalign and
5169 aligned_alloc functions could allocate too few bytes or corrupt the
5170 heap when passed very large allocation size values (Bugzilla #15855,
5173 * CVE-2013-4458 Stack overflow in getaddrinfo with large number of results
5174 for AF_INET6 has been fixed (Bugzilla #16072).
5176 * New locales: ak_GH, anp_IN, ar_SS, cmn_TW, hak_TW, lzh_TW, nan_TW, pap_AW,
5177 pap_CW, quz_PE, the_NP.
5179 * Substantially revised locales: gd_GB, ht_HT
5181 * The LC_ADDRESS field was updated to support country_car for almost all
5184 * ISO 1427 definitions were updated.
5186 * ISO 3166 definitions were updated.
5188 * The localedef utility now supports --big-endian and --little-endian
5189 command-line options to generate locales for a different system from that
5190 for which the C library was built.
5192 * Binary locale files now only depend on the endianness of the system for
5193 which they are generated and not on other properties of that system. As a
5194 consequence, binary files generated with new localedef may be incompatible
5195 with old versions of the GNU C Library, and binary files generated with
5196 old localedef may be incompatible with this version of the GNU C Library,
5197 in the following circumstances:
5199 + Locale files may be incompatible on m68k systems.
5201 + Locale archive files (but not separate files for individual locales) may
5202 be incompatible on systems where plain "char" is signed.
5204 * The configure option --disable-versioning has been removed. Builds with
5205 --disable-versioning had not worked for several years.
5207 * ISO 639 definitions were updated for Chiga (cgg) and Chinese (gan, hak, czh,
5208 cjy, lzh, cmn, mnp, cdo, czo, cpx, wuu, hsn, yue).
5210 * SystemTap probes for malloc have been introduced.
5212 * SystemTap probes for slow multiple precision fallback paths of
5213 transcendental functions have been introduced.
5215 * Support for powerpc64le has been added.
5217 * The soft-float powerpc port now supports e500 processors.
5219 * Support for STT_GNU_IFUNC symbols added for ppc32/power4+ and ppc64.
5221 * A new feature test macro _DEFAULT_SOURCE is available to enable the same
5222 set of header declarations that are enabled by default, even when other
5223 feature test macros or compiler options such as -std=c99 would otherwise
5224 disable some of those declarations.
5226 * The _BSD_SOURCE feature test macro no longer enables BSD interfaces that
5227 conflict with POSIX. The libbsd-compat library (which was a dummy library
5228 that did nothing) has also been removed.
5230 * Preliminary documentation about Multi-Thread, Async-Signal and
5231 Async-Cancel Safety has been added.
5233 * Change of ABI data structures for s390 and s390x:
5234 On s390 and s390x the size of struct ucontext and jmp_buf was increased to
5235 allow for future hardware extensions. All library functions that accept or
5236 return these structures were versioned in order to provide backwards
5237 compatibility with existing code. However, not all cases can be handled
5238 with interface versioning. If an application embeds either structure into
5239 another structure and that structure is passed to another compilation unit
5240 which expects the newer larger-sized object then any access to the new
5241 fields will result in undefined behaviour. Similarly any access to fields
5242 that were moved by the enlarging of the structures will cause undefined
5243 behaviour. To fix the undefined behaviour all objects that are part of the
5244 final in-memory image must agree on the size of structures, and this may
5245 require recompilation.
5249 * The following bugs are resolved with this release:
5251 2546, 2560, 5159, 6809, 7006, 10060, 10062, 10283, 10357, 10686, 11120,
5252 11561, 12310, 12387, 12492, 12515, 12723, 13550, 13889, 13951, 13988,
5253 14142, 14176, 14200, 14256, 14280, 14293, 14317, 14327, 14478, 14496,
5254 14582, 14686, 14812, 14888, 14894, 14907, 14908, 14909, 14920, 14941,
5255 14952, 14964, 14981, 14982, 14985, 14991, 14994, 14996, 15000, 15003,
5256 15006, 15007, 15014, 15020, 15022, 15023, 15036, 15054, 15055, 15062,
5257 15078, 15084, 15085, 15086, 15100, 15160, 15214, 15221, 15232, 15234,
5258 15283, 15285, 15287, 15304, 15305, 15307, 15309, 15327, 15330, 15335,
5259 15336, 15337, 15339, 15342, 15346, 15359, 15361, 15366, 15380, 15381,
5260 15394, 15395, 15405, 15406, 15409, 15416, 15418, 15419, 15423, 15424,
5261 15426, 15429, 15431, 15432, 15441, 15442, 15448, 15465, 15480, 15485,
5262 15488, 15490, 15492, 15493, 15497, 15506, 15529, 15536, 15553, 15577,
5263 15583, 15618, 15627, 15631, 15654, 15655, 15666, 15667, 15674, 15711,
5266 * CVE-2013-2207 Incorrectly granting access to another user's pseudo-terminal
5267 has been fixed by disabling the use of pt_chown (Bugzilla #15755).
5268 Distributions can re-enable building and using pt_chown via the new configure
5269 option `--enable-pt_chown'. Enabling the use of pt_chown carries with it
5270 considerable security risks and should only be used if the distribution
5271 understands and accepts the risks.
5273 * CVE-2013-0242 Buffer overrun in regexp matcher has been fixed (Bugzilla
5276 * CVE-2013-1914 Stack overflow in getaddrinfo with many results has been
5277 fixed (Bugzilla #15330).
5279 * Add support for calling C++11 thread_local object destructors on thread
5280 and program exit. This needs compiler support for offloading C++11
5281 destructor calls to glibc.
5283 * Improved worst case performance of libm functions with double inputs and
5286 * Support for priority inherited mutexes in pthread condition variables on
5287 non-x86 architectures.
5289 * Port to Xilinx MicroBlaze contributed by David Holsgrove.
5291 * Optimized string functions for AArch64. Implemented by Marcus Shawcroft.
5293 * Optimized string functions for ARM. Implemented by Will Newton and
5296 * Optimized libm functions for SPARC. Implemented by David S. Miller.
5298 * Support for building more of ARM glibc as Thumb-2 code. Implemented by
5301 * Support for building most of MIPS glibc as MIPS16 code. Implemented by
5302 Chung-Lin Tang, Maciej W. Rozycki and Maxim Kuvyrkov.
5304 * Added a benchmark framework to track performance of functions in glibc.
5306 * New <math.h> macro named issignaling to check for a signaling NaN (sNaN).
5307 It is based on draft TS 18661 and currently enabled as a GNU extension.
5309 * On Linux, the clock function now uses the clock_gettime system call
5310 for improved precision, rather than old times system call.
5312 * Added support for version-3 tz format files. This is needed when using
5313 the tz database release 2013e or later, and affects a few unusual cases --
5314 currently only TZ='America/Godthab' for time stamps after 2037.
5316 * Added new API functions pthread_getattr_default_np and
5317 pthread_setattr_default_np to get and set the default pthread
5318 attributes of a process.
5320 * Added support for TSX lock elision for pthread mutexes on i386 and x86-64.
5321 This may improve lock scaling of existing programs on TSX capable systems.
5322 When the --enable-lock-elision=yes parameter is specified at configure
5323 time lock elision will be enabled by default for all PTHREAD_MUTEX_DEFAULT
5326 * Support added for AT_HWCAP2 (to coincide with Linux kernel 3.10
5327 availability). Implemented by Ryan S. Arnold.
5329 * Support added for POWER8 platform. Implemented by Ryan S. Arnold.
5333 * The following bugs are resolved with this release:
5335 1349, 3439, 3479, 3665, 5044, 5246, 5298, 5400, 6530, 6677, 6778, 6808,
5336 9685, 9914, 10014, 10038, 10114, 10191, 10631, 10873, 11438, 11607, 11638,
5337 11741, 12140, 13013, 13412, 13542, 13601, 13603, 13604, 13629, 13679,
5338 13696, 13698, 13717, 13741, 13759, 13761, 13763, 13881, 13939, 13950,
5339 13952, 13966, 14042, 14047, 14090, 14150, 14151, 14152, 14154, 14157,
5340 14166, 14173, 14195, 14197, 14237, 14246, 14251, 14252, 14283, 14298,
5341 14303, 14307, 14328, 14331, 14336, 14337, 14347, 14349, 14368, 14376,
5342 14417, 14447, 14459, 14476, 14477, 14501, 14505, 14510, 14516, 14518,
5343 14519, 14530, 14532, 14538, 14543, 14544, 14545, 14557, 14562, 14568,
5344 14576, 14579, 14583, 14587, 14595, 14602, 14610, 14621, 14638, 14645,
5345 14648, 14652, 14660, 14661, 14669, 14672, 14683, 14694, 14716, 14719,
5346 14743, 14767, 14783, 14784, 14785, 14793, 14796, 14797, 14801, 14803,
5347 14805, 14807, 14811, 14815, 14821, 14822, 14824, 14828, 14831, 14833,
5348 14835, 14838, 14856, 14863, 14865, 14866, 14868, 14869, 14871, 14872,
5349 14879, 14889, 14893, 14898, 14914.
5351 * Optimization of memcpy for MIPS.
5353 * CVE-2011-4609 svc_run() produces high cpu usage when accept fails with
5354 EMFILE has been fixed (Bugzilla #14889).
5356 * The add-on ports collection is now distributed in the "ports" subdirectory
5357 of the main GNU C Library distribution, rather than separately.
5359 * Port to ARM AArch64 contributed by Linaro.
5361 * Support for STT_GNU_IFUNC symbols added for s390 and s390x.
5362 Optimized versions of memcpy, memset, and memcmp added for System z10 and
5364 Implemented by Andreas Krebbel.
5366 * The new function secure_getenv allows secure access to the environment,
5367 returning NULL if running in a SUID/SGID process. This function replaces
5368 the internal function __secure_getenv.
5370 * SystemTap static probes have been added into the dynamic linker.
5371 Implemented by Gary Benson.
5373 * Optimizations of string functions strstr, strcasestr and memmem.
5374 Implemented by Maxim Kuvyrkov.
5376 * The minimum Linux kernel version that this version of the GNU C Library
5377 can be used with is 2.6.16.
5379 * Optimizations of string functions memchr, wcschr, wcscpy, and wcsrchr for
5380 powerpc POWER7. Implemented by Will Schmidt.
5382 * New configure option --disable-nscd builds the C library such that it
5383 never attempts to contact the Name Service Caching Daemon (nscd).
5384 New configure option --disable-build-nscd avoids building nscd itself;
5385 this is the default if --disable-nscd is used.
5387 * Improved support for cross-compilation, including cross-testing and
5388 bootstrap builds without a previously built glibc.
5390 * Several testsuite tests are now able to test multiple IFUNC variants of an
5391 interface, rather than just testing the one that would be chooen by
5394 * New configure options --with-bugurl and --with-pkgversion, for
5395 distributors to use to embed their bug-reporting and package version
5396 information in --help and --version output.
5398 * The ttyname and ttyname_r functions on Linux now fall back to searching for
5399 the tty file descriptor in /dev/pts or /dev if /proc is not available. This
5400 allows creation of chroots without the procfs mounted on /proc.
5402 * The `crypt' function now fails if passed salt bytes that violate the
5403 specification for those values. On Linux, the `crypt' function will
5404 consult /proc/sys/crypto/fips_enabled to determine if "FIPS mode" is
5405 enabled, and fail on encrypted strings using the MD5 or DES algorithm
5406 when the mode is enabled.
5408 * The `clock_*' suite of functions (declared in <time.h>) is now available
5409 directly in the main C library. Previously it was necessary to link with
5410 -lrt to use these functions. This change has the effect that a
5411 single-threaded program that uses a function such as `clock_gettime' (and
5412 is not linked with -lrt) will no longer implicitly load the pthreads
5413 library at runtime and so will not suffer the overheads associated with
5414 multi-thread support in other code such as the C++ runtime library.
5416 * New locales: ayc_PE, doi_IN, ia_FR, mni_IN, nhn_MX, niu_NU, niu_NZ,
5421 * The following bugs are resolved with this release:
5423 174, 208, 350, 369, 411, 706, 766, 2074, 2541, 2547, 2548, 2550, 2551,
5424 2552, 2553, 2554, 2562, 2563, 2565, 2566, 2570, 2576, 2636, 2678, 3335,
5425 3440, 3748, 3768, 3866, 3868, 3906, 3976, 3992, 4026, 4108, 4596, 4822,
5426 5077, 5461, 5805, 5993, 6471, 6486, 6578, 6649, 6730, 6770, 6794, 6884,
5427 6890, 6894, 6895, 6907, 6911, 6959, 7064, 9739, 9902, 10110, 10135, 10140,
5428 10153, 10210, 10254, 10346, 10375, 10545, 10716, 10846, 10882, 11174,
5429 11261, 11322, 11365, 11451, 11494, 11521, 11677, 11837, 11959, 12047,
5430 12097, 12193, 12194, 12297, 12298, 12301, 12340, 12354, 12416, 12495,
5431 13058, 13223, 13361, 13525, 13526, 13527, 13528, 13529, 13530, 13531,
5432 13532, 13533, 13547, 13551, 13552, 13553, 13555, 13556, 13559, 13563,
5433 13566, 13576, 13579, 13583, 13592, 13594, 13613, 13618, 13637, 13656,
5434 13658, 13673, 13691, 13695, 13704, 13705, 13706, 13718, 13726, 13738,
5435 13739, 13743, 13750, 13758, 13760, 13761, 13775, 13786, 13787, 13792,
5436 13806, 13824, 13840, 13841, 13844, 13846, 13848, 13851, 13852, 13854,
5437 13871, 13872, 13873, 13879, 13882, 13883, 13884, 13885, 13886, 13892,
5438 13895, 13908, 13910, 13911, 13912, 13913, 13914, 13915, 13916, 13917,
5439 13918, 13919, 13920, 13921, 13922, 13923, 13924, 13926, 13927, 13928,
5440 13938, 13941, 13942, 13954, 13955, 13956, 13963, 13967, 13968, 13970,
5441 13973, 13979, 13983, 13986, 13996, 14012, 14027, 14033, 14034, 14036,
5442 14040, 14043, 14044, 14048, 14049, 14050, 14053, 14055, 14059, 14064,
5443 14075, 14080, 14083, 14103, 14104, 14109, 14112, 14117, 14122, 14123,
5444 14134, 14153, 14183, 14188, 14199, 14210, 14218, 14229, 14241, 14273,
5447 * Support for the x32 ABI on x86-64 added. The x32 target is selected by
5448 configuring glibc with:
5449 BUILD_CC='gcc' CC='gcc -mx32' CXX='g++ -mx32'
5450 Visit <https://sites.google.com/site/x32abi/> for more x32 ABI info.
5451 Implemented by H.J. Lu.
5455 + define static_assert
5457 + do not declare gets
5459 + declare at_quick_exit and quick_exit also for ISO C11
5461 + aligned_alloc. NB: The code is deliberately allows the size parameter
5462 to not be a multiple of the alignment. This is a moronic requirement
5463 in the standard but it is only a requirement on the caller, not the
5466 + timespec_get added
5468 + uchar.h support added
5470 + CMPLX, CMPLXF, CMPLXL added
5472 Implemented by Ulrich Drepper.
5474 * Support for the IA-64 has been moved to ports.
5476 * Remove support for anything but ELF binary format
5478 * Checking versions of poll, ppoll added.
5479 Implemented by Ulrich Drepper.
5481 * More generic and 64-bit performance optimizations to math functions.
5482 Implemented by Ulrich Drepper.
5484 * New configure option --enable-obsolete-rpc makes the deprecated RPC
5485 headers and functions available at compile time as they were before
5486 version 2.14. This option will be removed at some time in the future
5487 after the TI-RPC library becomes fully sufficient for the needs of
5488 existing applications.
5490 * Compatibility code for Linux kernel versions before 2.4 has been removed.
5491 Note that glibc is not expected to work with any Linux kernel version
5494 * New header <sys/auxv.h> and function getauxval allowing easy access to
5495 the AT_* key-value pairs passed from the Linux kernel. The header also
5496 defines the HWCAP_* bits associated with the AT_HWCAP key.
5498 * New locales: mag_IN
5500 * New configure option --enable-systemtap builds SystemTap static probes
5501 into libc for setjmp and longjmp and into libpthread for various operations.
5502 So far the setjmp/longjmp probes and some of the libpthread probes are
5503 provided only for i*86 and x86_64.
5504 Implemented by Roland McGrath and Rayson Ho.
5506 * Optimized expf for x86-32 and x86-64. Implemented by Liubov Dmitrieva.
5508 * More optimized functions for PowerPC. Implemented by Adhemerval Zanella
5511 * More optimized functions for SPARC. Implemented by David S. Miller.
5513 * Improved support for cross-compilation, especially bootstrap builds
5514 without a previously built glibc.
5516 * Ports for the TILE-Gx and TILEPro families of processors. Contributed by
5517 Chris Metcalf from Tilera.
5519 * Support for the old ARM ABI has been removed from ports. Only the EABI is
5520 now supported for ARM processors.
5522 * The hard-float variant of the ARM EABI now uses /lib/ld-linux-armhf.so.3
5523 as the name of the dynamic linker, to distinguish it from the
5524 /lib/ld-linux.so.3 dynamic linker used for the base EABI.
5526 * Support for CRIS has been removed from ports.
5528 * A new class of installed header has been documented for low-level
5529 platform-specific functionality. PowerPC added the first instance with a
5530 function to provide time base register access. Contributed by Tulio
5531 Magno Quites Machado Filho.
5533 * ix86 configurations now install header files that are consistent with
5534 what x86-64 configurations install. These same header files can be used
5535 for -m32, -m64, or -mx32 builds.
5536 Contributed by H.J. Lu.
5538 * Math library bug fixes. A thorough audit of all open math library bugs was
5539 conducted by Joseph Myers. Significant progress was made on many math
5540 library bugs resulting in more accurate exceptions and function results.
5541 Many thanks to all those that contributed including Andreas Jaeger for his
5542 patch review and work on the x87 trigonometric instruction issues.
5544 * Timezone data is no longer installed. Timezone-related binaries and scripts
5545 will continue to be installed. Users should obtain their timezone data from
5546 their distribution provider or from the tzdata package at
5547 <ftp://munnari.oz.au/pub/>.
5551 * The following bugs are resolved with this release:
5553 6779, 6783, 9696, 10103, 10709, 11589, 11929, 12403, 12786, 12840, 12847,
5554 12868, 12852, 12874, 12885, 12892, 12906, 12907, 12922, 12935, 12962,
5555 13007, 13021, 13061, 13062, 13067, 13068, 13085, 13088, 13090, 13092,
5556 13096, 13114, 13118, 13123, 13134, 13138, 13147, 13150, 13166, 13179,
5557 13185, 13189, 13192, 13268, 13276, 13282, 13291, 13305, 13328, 13335,
5558 13337, 13344, 13358, 13367, 13413, 13416, 13423, 13439, 13446, 13472,
5559 13484, 13506, 13515, 13523, 13524, 13538, 13540
5561 * New program pldd to list loaded object of a process
5562 Implemented by Ulrich Drepper.
5564 * Add nss_db support back to glibc. No more dependency on Berkeley db
5565 and support for initgroups lookups.
5566 Implemented by Ulrich Drepper.
5568 * Optimized strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-32.
5569 Contributed by HJ Lu.
5571 * Improved strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-64.
5572 Contributed by HJ Lu.
5574 * Optimized strcat, strncat on x86-64 and optimized wcscmp, wcslen, strnlen
5575 on x86-32 and x86-64.
5576 Contributed by Liubov Dmitrieva.
5578 * Optimized strchr and strrchr for SSE on x86-32.
5579 Contributed by Liubov Dmitrieva.
5581 * Optimized memchr, memrchr, rawmemchr, memcmp, wmemcmp, wcschr, wcscpy
5582 for x86-64 and x86-32.
5583 Contributed by Liubov Dmitrieva.
5585 * New interfaces: scandirat, scandirat64
5586 Implemented by Ulrich Drepper.
5588 * Checking versions of FD_SET, FD_CLR, and FD_ISSET added.
5589 Implemented by Ulrich Drepper.
5591 * nscd now also caches the netgroup database.
5592 Implemented by Ulrich Drepper.
5594 * Integrate libm with gcc's -ffinite-math-only option.
5595 Implemented by Ulrich Drepper.
5597 * Lots of generic, 64-bit, and x86-64-specific performance optimizations
5598 to math functions. Implemented by Ulrich Drepper.
5600 * Optimized strcasecmp and strncasecmp for AVX on x86-64.
5601 Implemented by Ulrich Drepper.
5603 * New Linux interfaces: process_vm_readv, process_vm_writev
5605 * Optimized strcasecmp and strncasecmp for SSSE3 and SSE4.2 on x86-32.
5606 Implemented by Ulrich Drepper.
5608 * Optimized nearbyint and strcasecmp for PPC.
5609 Implemented by Adhemerval Zanella.
5611 * New locales: bho_IN, unm_US, es_CU, ta_LK
5615 * The following bugs are resolved with this release:
5617 386, 6420, 7101, 9730, 9732, 9809, 10138, 10149, 10157, 11099, 11257,
5618 11258, 11487, 11532, 11558, 11578, 11634, 11653, 11668, 11697, 11724,
5619 11781, 11799, 11820, 11837, 11857, 11884, 11892, 11895, 11901, 11945,
5620 11947, 11952, 11987, 12052, 12083, 12158, 12178, 12200, 12346, 12350,
5621 12393, 12420, 12432, 12445, 12449, 12453, 12454, 12460, 12469, 12489,
5622 12509, 12510, 12511, 12518, 12527, 12541, 12545, 12551, 12582, 12583,
5623 12587, 12597, 12601, 12611, 12625, 12626, 12631, 12650, 12653, 12655,
5624 12660, 12671, 12681, 12684, 12685, 12711, 12713, 12714, 12717, 12723,
5625 12724, 12734, 12738, 12746, 12766, 12775, 12777, 12782, 12788, 12792,
5626 12795, 12811, 12813, 12814, 12841
5628 * The RPC implementation in libc is obsoleted. Old programs keep working
5629 but new programs cannot be linked with the routines in libc anymore.
5630 Programs in need of RPC functionality must be linked against TI-RPC.
5631 The TI-RPC implementation is IPv6 enabled and there are other benefits.
5633 Visible changes of this change include (obviously) the inability to link
5634 programs using RPC functions without referencing the TI-RPC library and the
5635 removal of the RPC headers from the glibc headers.
5636 Implemented by Ulrich Drepper.
5638 * New Linux interfaces: clock_adjtime, name_to_handle_at, open_by_handle_at,
5639 syncfs, setns, sendmmsg
5641 * New locales: os_RU, bem_ZA, en_ZA, ff_SN, sw_KE, sw_TZ, lb_LU, wae_CH,
5642 yue_HK, lij_IT, mhr_RU
5644 * New encodings: CP770, CP771, CP772, CP773, CP774
5646 * New program sotruss to trace calls through PLTs
5647 Implemented by Ulrich Drepper.
5649 * The malloc hook implementation is marked deprecated and will be removed
5650 from the default implementation in the next version. The design never
5651 worked ever since the introduction of threads. Even programs which do
5652 not create threads themselves can use multiple threads created internally.
5656 * The following bugs are resolved with this release:
5658 3268, 6812, 7066, 10085, 10484, 10563, 10851, 11149, 11155, 11577, 11611,
5659 11640, 11655, 11701, 11840, 11856, 11883, 11903, 11904, 11968, 11979,
5660 12005, 12037, 12067, 12077, 12078, 12092, 12093, 12107, 12108, 12113,
5661 12140, 12159, 12167, 12191, 12194, 12201, 12204, 12205, 12207, 12348,
5664 * New Linux interfaces: prlimit, prlimit64, fanotify_init, fanotify_mark
5666 * POWER7 optimizations: memset, memcmp, strncmp
5668 * New optimized string functions for x86-64: strnlen (SSE2),
5669 strcasecmp (SSE2, SSSE3, SSE4.2), strncasecmp (SSE2, SSSE3, SSE4.2)
5670 Implemented by Ulrich Drepper.
5674 * The following bugs are resolved with this release:
5676 3662, 4457, 5553, 10162, 10401, 10414, 10554, 10824, 10864, 10915,
5677 10918, 10936, 10939, 10958, 10968, 10969, 10972, 10992, 11000, 11001,
5678 11007, 11010, 11027, 11039, 11040, 11041, 11043, 11046, 11056, 11070,
5679 11093, 11115, 11125, 11126, 11127, 11134, 11141, 11149, 11183, 11184,
5680 11185, 11186, 11187, 11188, 11189, 11190, 11191, 11192, 11193, 11194,
5681 11200, 11230, 11235, 11242, 11254, 11258, 11271, 11272, 11276, 11279,
5682 11287, 11292, 11319, 11332, 11333, 11387, 11389, 11390, 11394, 11397,
5683 11410, 11438, 11449, 11470, 11471, 11520, 11537, 11538, 11571
5685 * New interfaces: pthread_getname_np, pthread_setname_np
5687 * New Linux interface: recvmmsg
5689 * STT_GNU_IFUNC implemented for Sparc by David Miller.
5691 * The dynamic linker now recognizes supported ABI versions from the
5692 EI_ABIVERSION field in the ELF header.
5693 Implemented by Ulrich Drepper.
5695 * New NIS mode selector ADJUNCT_AS_SHADOW. The passwd.adjunct.byname table
5696 will not be used to fill in password fields in the passwd.byname replies.
5697 Instead it is used to synthesize the shadow.byname table, should it be
5698 missing. This is a useful mode in some installations involving Solaris.
5699 Implemented by Ulrich Drepper.
5701 * New locales: kok_IN, sq_MK, cv_RU
5705 * The following bugs are resolved with this release:
5707 3270, 7094, 9924, 9986, 10011, 10085, 10107, 10159, 10162, 10166, 10183,
5708 10195, 10196, 10200, 10203, 10207, 10211, 10213, 10217, 10221, 10229,
5709 10262, 10286, 10312, 10315, 10319, 10349, 10360, 10391, 10402, 10416,
5710 10418, 10422, 10425, 10446, 10448, 10452, 10540, 10553, 10560, 10564,
5711 10609, 10643, 10692, 10713, 10717, 10730, 10731, 10742, 10780, 10784,
5712 10789, 10817, 10823, 10840, 10847
5714 * New interfaces: execvpe, pthread_sigqueue, mkstemps, mkstemps64, mkostemps,
5716 Implemented by Ulrich Drepper.
5718 * Checking version of longjmp added that fails if an uninitialized stack
5719 frame would be created. Implemented by Ulrich Drepper.
5721 * STT_GNU_IFUNC is now supported in static executables.
5722 Implemented by H.J. Lu.
5724 * STT_GNU_IFUNC implemented for PPC by Alan Modra.
5726 * New optimized string functions for x86-64: strstr, strcasestr, memcmp,
5727 strcspn, strpbrk, strspn, strcpy, stpcpy, strncpy, strcmp (SSE2, SSE4.2),
5728 strncmp (SSE2, SSE4.2), strchr (SSE4.2), strrchr (SSE4.2).
5729 Contributed by H.J. Lu.
5731 strlen, rawmemchr, strcmp (SSSE3), strncmp (SSSE3).
5732 Implemented by Ulrich Drepper.
5734 * New optimized string functions for x86: strlen, strcspn, strspn, strpbrk,
5736 Contributed by H.J. Lu.
5738 * Support for fma instruction in AVX on x86-64.
5739 Implemented by H.J. Lu and Ulrich Drepper.
5741 * AVX support in x86-64 auditing support in ld.so.
5742 Implemented by H.J. Lu.
5744 * STB_GNU_UNIQUE support added.
5745 Implemented by Ulrich Drepper.
5747 * Implement second fallback mode for optimized DNS lookup for even more
5748 broken environments. If two requests from the same port are not
5749 handled correctly close the socket and open a new one before sending
5750 the second request. The 'single-request-reopen' option in /etc/resolv.conf
5751 can be used to select this mode right away, instead of rediscovering the
5752 necessity is every process again.
5753 Implemented by Ulrich Drepper.
5755 * New resolver flag RES_USE_DNSSEC to enable use of verified lookup.
5756 Implemented by Adam Tkac.
5758 * Optimized iconv conversions for S390x.
5759 Implemented by Andreas Krebbel.
5761 * Using condvars with PI mutexes is now more efficient due to kernel
5762 support for requeueing to PI futexes. NPTL support added for x86-64.
5763 Implemented by Ulrich Drepper.
5765 * New locales: ps_AF, my_MM
5769 * The following bugs are resolved with this release:
5771 697, 5381, 5807, 6411, 6545, 7040, 7058, 7067, 7080, 7083, 7095, 7098,
5772 9677, 9694, 9697, 9701, 9704, 9705, 9706, 9720, 9726, 9730, 9733, 9736,
5773 9741, 9750, 9753, 9759, 9781, 9791, 9793, 9823, 9833, 9844, 9880, 9881,
5774 9891, 9893, 9895, 9913, 9916, 9920, 9948, 9955, 9957, 9963, 9985, 10052,
5775 10069, 10086, 10087, 10090, 10092, 10093, 10100, 10118, 10128
5777 * New interfaces: preadv, preadv64, pwritev, pwritev64, malloc_info
5778 Implemented by Ulrich Drepper.
5780 * New Linux interfaces: accept4, fallocate, fallocate64.
5781 Implemented by Ulrich Drepper.
5783 * Correct declarations of string function when used in C++ code. This
5784 could lead to compile errors for invalid C++ code.
5786 * XPG7/POSIX 2008 compilation environment. Many GNU-specific functions are
5789 * New POSIX 2008 interface: psiginfo
5790 Implemented by Ulrich Drepper.
5792 * New ISO C++1x interfaces: quick_exit, at_quick_exit
5793 Implemented by Ulrich Drepper.
5795 * Support for selecting between multiple function definitions at runtime
5796 using STT_GNU_IFUNC symbols. Implemented by Ulrich Drepper.
5798 * The libcrypt library can now use the hash function implementations in
5799 NSS. Implemented by Ulrich Drepper.
5801 * The malloc implementation can be compiled to be less memory efficient
5802 but higher performing in multi-threaded programs.
5803 Implemented by Ulrich Drepper.
5805 * New locales: nan_TW@latin, ks_IN
5807 * Faster strlen, strchr, strchrnul, strrchr, memchr, and rawmemchr for x86-64.
5808 Implemented by Ulrich Drepper.
5810 * Extended printf hook support. It is possible to use user-defined types
5811 and extend existing format specifiers.
5812 Implemented by Ulrich Drepper.
5814 * Handling for group shadow files has been added.
5815 Implemented by Ulrich Drepper.
5817 * DNS IPv4-IPv6 parallel lookup now deals better with broken DNS
5818 servers (the case, e.g., for some people using the built-in DNS
5819 server in ADSL modems/routers). There is a once-per-process timeout
5820 in case of a broken server. To avoid it, users can run nscd or put
5821 'options single-request' in /etc/resolv.conf.
5822 Implemented by Ulrich Drepper.
5826 * The following bugs are resolved with this release:
5828 2447, 3406, 5209, 5210, 5381, 5794, 5814, 5911, 6428, 6438, 6442, 6447,
5829 6461, 6472, 6505, 6544, 6589, 6612, 6634, 6653, 6654, 6657, 6698, 6712,
5830 6713, 6719, 6723, 6724, 6740, 6763, 6771, 6790, 6791, 6817, 6824, 6839,
5831 6843, 6845, 6856, 6857, 6860, 6867, 6875, 6919, 6920, 6942, 6947, 6955,
5832 6966, 6968, 6974, 6980, 6995, 7008, 7009, 7029
5834 * Unified lookup for getaddrinfo: IPv4 and IPv6 addresses are now looked
5835 up at the same time. Implemented by Ulrich Drepper.
5837 * TLS descriptors for LD and GD on x86 and x86-64.
5838 Implemented by Alexandre Oliva.
5840 * getaddrinfo now handles DCCP and UDPlite.
5841 Implemented by Ulrich Drepper.
5843 * New fixed-size conversion macros: htobe16, htole16, be16toh, le16toh,
5844 htobe32, htole32, be32toh, le32toh, htobe64, htole64, be64toh, le64toh.
5845 Implemented by Ulrich Drepper.
5847 * New implementation of memmem, strstr, and strcasestr which is O(n).
5848 Implemented by Eric Blake.
5850 * New Linux interfaces: inotify_init1, dup3, epoll_create1, pipe2
5852 * Implement "e" option for popen to open file descriptor with the
5853 close-on-exec flag set. Implemented by Ulrich Drepper.
5855 * Implement "b" mode for fmemopen. In this mode writes writes don't
5856 implicitly add a NUL byte and seeks from the end of the buffer really
5857 use the buffer end, not the string length as the basis.
5858 Implemented by Ulrich Drepper.
5860 * Many functions, exported and internal, now atomically set the close-on-exec
5861 flag when run on a sufficiently new kernel. Implemented by Ulrich Drepper.
5863 * Sorting rules for some Indian languages (Kannada, Gurumukhi, Telugu,
5865 Implemented by Pravin Satpute.
5867 * New locales: sd_IN, sd_IN@devanagari, ks_IN@devanagari, ht_HT, en_AG, nl_AW.
5871 * The following bugs are resolved with this release:
5873 2549, 3112, 4314, 4407, 4997, 5012, 5040, 5112, 5204, 5208, 5209, 5220,
5874 5222, 5224, 5225, 5237, 5238, 5240, 5245, 5277, 5346, 5375, 5378, 5382,
5875 5424, 5427, 5428, 5435, 5436, 5439, 5441, 5442, 5443, 5451, 5452, 5454,
5876 5455, 5463, 5464, 5465, 5475, 5477, 5478, 5520, 5541, 5545, 5553, 5600,
5877 5602, 5607, 5614, 5627, 5628, 5736, 5737, 5741, 5753, 5760, 5762, 5768,
5878 5774, 5777, 5778, 5779, 5786, 5790, 5818, 5854, 5857, 5903, 5939, 5979,
5879 5983, 5995, 5998, 6004, 6007, 6020, 6021, 6024, 6040, 6042
5881 * New locales: bo_CN, bo_IN, shs_CA.
5883 * New encoding: HP-ROMAN9, HP-GREEK8, HP-THAI8, HP-TURKISH8.
5885 * Sorting rules for some Indian languages (Devanagari and Gujarati).
5886 Implemented by Pravin Satpute.
5888 * IPV6 addresses in /etc/resolv.conf can now have a scope ID
5890 * nscd caches now all timeouts for DNS entries
5891 Implemented by Ulrich Drepper.
5893 * nscd is more efficient and wakes up less often.
5894 Implemented by Ulrich Drepper.
5896 * More checking functions: asprintf, dprintf, obstack_printf, vasprintf,
5897 vdprintf, and obstack_vprintf.
5898 Implemented by Jakub Jelinek.
5900 * Faster memset for x86-64.
5901 Implemented by Harsha Jagasia and H.J. Lu.
5903 * Faster memcpy on x86.
5904 Implemented by Ulrich Drepper.
5906 * ARG_MAX is not anymore constant on Linux. Use sysconf(_SC_ARG_MAX).
5907 Implemented by Ulrich Drepper.
5909 * Faster sqrt and sqrtf implementation for some PPC variants.
5910 Implemented by Steven Munroe.
5914 * The following bugs are resolved with this release:
5916 4125, 4126, 4178, 4359, 4407, 4512, 4514, 4525, 4554, 4556, 4557, 4566,
5917 4582, 4586, 4588, 4599, 4610, 4647, 4702, 4705, 4726, 4745, 4772, 4773,
5918 4775, 4776, 4792, 4813, 4814, 4816, 4833, 4858, 4860, 4896, 4905, 4925,
5919 4936, 4937, 4938, 4941, 4946, 4963, 4972, 5010, 5028, 5043, 5058, 5063,
5920 5071, 5103, 5104, 5112, 5113, 5184, 5186
5922 * More checking functions: fread, fread_unlocked, open*, mq_open.
5923 Implemented by Jakub Jelinek and Ulrich Drepper.
5925 * Extend fortification to C++. Implemented by Jakub Jelinek.
5927 * Implement 'm' modifier for scanf. Add stricter C99/SUS compliance
5928 by not recognizing 'a' as a modifier when those specs are requested.
5929 Implemented by Jakub Jelinek.
5931 * PPC optimizations to math and string functions.
5932 Implemented by Steven Munroe.
5934 * New interfaces: mkostemp, mkostemp64. Like mkstemp* but allow additional
5935 options to be passed. Implemented by Ulrich Drepper.
5937 * More CPU set manipulation functions. Implemented by Ulrich Drepper.
5939 * New Linux interfaces: signalfd, eventfd, eventfd_read, and eventfd_write.
5940 Implemented by Ulrich Drepper.
5942 * Handle private futexes in the NPTL implementation.
5943 Implemented by Jakub Jelinek and Ulrich Drepper.
5945 * Add support for O_CLOEXEC. Implement in Hurd. Use throughout libc.
5946 Implemented by Roland McGrath and Ulrich Drepper.
5948 * Linux/x86-64 vDSO support. Implemented by Ulrich Drepper.
5950 * SHA-256 and SHA-512 based password encryption.
5951 Implemented by Ulrich Drepper.
5953 * New locales: ber_DZ, ber_MA, en_NG, fil_PH, fur_IT, fy_DE, ha_NG, ig_NG,
5954 ik_CA, iu_CA, li_BE, li_NL, nds_DE, nds_NL, pap_AN, sc_IT, tk_TM, ug_CN,
5957 + New iconv modules: MAC-CENTRALEUROPE, ISO-8859-9E, KOI8-RU.
5958 Implemented by Ulrich Drepper.
5962 * The following bugs are resolved with this release:
5964 3156, 3213, 3285, 3291, 3306, 3313, 3320, 3322, 3325, 3326, 3334, 3348,
5965 3352, 3363, 3369, 3426, 3427, 3429, 3451, 3458, 3465, 3480, 3483, 3493,
5966 3514, 3515, 3559, 3632, 3664, 3673, 3674, 3745, 3747, 3818, 3840, 3842,
5967 3851, 3855, 3884, 3885, 3902, 3905, 3919, 3944, 3954, 3955, 3957, 3991,
5968 3995, 3996, 4024, 4040, 4069, 4070, 4074, 4076, 4096, 4101, 4102, 4114,
5969 4130, 4131, 4181, 4276, 4306, 4342, 4344, 4349, 4364, 4368, 4381, 4392,
5970 4403, 4405, 4406, 4411, 4438, 4439, 4455, 4456, 4465, 4512, 4514, 4586,
5973 * New Linux interfaces: epoll_pwait, sched_getcpu.
5975 * New generic interfaces: strerror_l.
5977 * nscd can now cache the services database. Implemented by Ulrich Drepper.
5981 * The following bugs are resolved with this release:
5983 39, 68, 192, 352, 388, 531, 935, 1006, 1201, 1203, 1386, 1782, 1783, 1784,
5984 1785, 1786, 1787, 1951, 1974, 1996, 2072, 2098, 2125, 2134, 2158, 2182,
5985 2349, 2376, 2386, 2389, 2415, 2418, 2420, 2423, 2450, 2451, 2466, 2472,
5986 2473, 2477, 2498, 2499, 2501, 2502, 2505, 2507, 2508, 2509, 2517, 2526,
5987 2569, 2571, 2592, 2611, 2625, 2632, 2644, 2662, 2680, 2683, 2684, 2693,
5988 2695, 2703, 2734, 2751, 2764, 2766, 2775, 2792, 2821, 2823, 2832, 2841,
5989 2843, 2883, 2892, 2908, 2914, 2926, 2961, 2978, 2980, 2987, 2997, 2998,
5990 3013, 3018, 3034, 3040, 3044, 3123, 3124, 3137, 3138, 3143, 3155, 3189,
5991 3225, 3251, 3252, 3253, 3273
5993 * For Linux, the sorting of addresses returned by getaddrinfo now also
5994 handles rules 3, 4, and 7 from RFC 3484. I.e., all rules are handled.
5995 Implemented by Ulrich Drepper.
5997 * Allow system admin to configure getaddrinfo with the /etc/gai.conf file.
5998 Implemented by Ulrich Drepper.
6000 * New Linux interfaces: splice, tee, sync_file_range, vmsplice.
6002 * New iconv module for MIK. Contributed by Alexander Shopov.
6004 * For sites with broken group and/or passwd database, the auto-propagate
6005 option of nscd can prevent creating ID lookup entries from the results
6006 of a name lookup and vice versa. This usually is no problem but some
6007 site might have problems with the default behavior.
6008 Implemented by Ulrich Drepper.
6010 * Iterating over entire database in NIS can be slow. With the
6011 SETENT_BATCH_READ option in /etc/default/nss a system admin can decide
6012 to trade time for memory. The entire database will be read at once.
6013 Implemented by Ulrich Drepper.
6015 * The interfaces introduced in RFC 3542 have been implemented by
6018 * Support for the new ELF hash table format was added by Ulrich Drepper.
6020 * Support for priority inheritance mutexes added by Jakub Jelinek and
6023 * Support for priority protected mutexes added by Jakub Jelinek.
6025 * New locales: nr_ZA, pa_PK, ca_AD, ca_FR, ca_IT, el_CY, tr_CY, as_IN,
6026 or_IN, csb_PL, fy_NL, sr_ME.
6030 * More overflow detection functions.
6032 * New iconv converters for IBM1025, IBM1122, IBM1137, IBM1153,
6033 IBM1154, IBM1155, IBM1156, IBM1157, and IBM1158 contributed by Jiro Sekiba.
6035 More converters for IBM803, IBM901, IBM902, IBM921, IBM1008, IBM1097,
6036 IBM1112, IBM1123, IBM1130, IBM1140, IBM1141, IBM1142, IBM1143, IBM1144,
6037 IBM1145, IBM1146, IBM1147, IBM1148, IBM1149, IBM1166, IBM1167, IBM4517,
6038 IBM4899, IBM4909, IBM4971, IBM5347, IBM9030, IBM9066, IBM9448, IBM12712,
6039 IBM16804, IBM1364, IBM1371, IBM1388, IBM1390, and IBM1399 contributed
6040 by Masahide Washizawa.
6042 * It is now possible to install audit libraries for the dynamic linker using
6043 LD_AUDIT. Implemented by Ulrich Drepper.
6045 * The LinuxThreads add-on, providing pthreads on Linux 2.4 kernels, is no
6046 longer supported. The new NPTL implementation requires Linux 2.6 kernels.
6047 For a libc and libpthread that works well on Linux 2.4 kernels, we
6048 recommend using the stable 2.3 branch.
6050 * The new function open_wmemstream acts like open_memstream,
6051 but uses a wchar_t wide character buffer.
6053 * The new function ppoll is an improved version of poll, similar to pselect.
6055 * New interfaces: fdopendir, openat, fstatat, fchmodat, fchownat,
6056 futimesat, faccessat, mkdirat, mkfifoat, mknodat,
6057 renameat, unlinkat, linkat, symlinkat, readlinkat.
6059 * New Linux kernel system calls: unshare,
6060 inotify_init, inotify_add_watch, inotify_rm_watch.
6062 * The euidaccess function is now also known by the alias eaccess,
6063 for compatibility with some other systems.
6065 * Timezone data updated to 2006b version.
6069 * The following bugs are resolved with this release:
6071 38, 253, 549, 622, 653, 721, 758, 851, 877, 915, 934, 955, 961,
6072 1016, 1037, 1076, 1079, 1080, 1081, 1082, 1083, 1084, 1085, 1086,
6073 1087, 1088, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098,
6074 1099, 1100, 1101, 1102, 1103, 1104, 1105, 1106, 1107, 1108, 1109,
6075 1110, 1111, 1112, 1113, 1125, 1137, 1138, 1249, 1250, 1251, 1252,
6076 1253, 1254, 1350, 1358, 1394, 1438, 1498, 1534
6078 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
6080 * As of this release, GCC 4 can be used to compile the C Library.
6082 * Timezone data updated to 2005m version.
6086 * The following bugs are resolved with this release:
6088 284, 592, 602, 626, 633, 640, 650, 661, 671, 681, 693, 700, 710, 719,
6089 722, 723, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736,
6090 737, 738, 739, 740, 741, 742, 743, 744, 745, 765, 767, 768, 769, 776,
6091 777, 787, 821, 822, 823, 825
6093 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
6097 * Support for RFC 3678. Real implementations exist only for Linux so far.
6098 Implemented by Ulrich Drepper.
6100 * nscd can now cache entries persistently. Expiring entries are reloaded.
6101 For speedups the cache can be shared in memory with client processes.
6102 Implemented by Ulrich Drepper.
6104 * nscd can now perform SELinux checks.
6105 Implemented by Matthew Rickard <mjricka@epoch.ncsc.mil>.
6107 * getaddrinfo queries are now cached. Canonical name lookup is performed
6109 Implemented by Ulrich Drepper.
6111 * The nothrow function attribute is used when headers are used by gcc when
6112 compiling C code. This can avoid significant amounts of exception
6115 * The malloc functions perform more error checking and are stricter when
6116 it comes to reacting on errors. The default action is to terminate
6117 the process after showing an error message. Implemented by Ulrich Drepper.
6119 * Reverse lookups of IPv6 addresses does not use bit string or .ip6.int
6120 lookups anymore unless explicitly requested. Implemented by Ulrich Drepper.
6122 * Namespaces in ld.so are implemented. DSOs can be loaded in separate
6123 namespaces using the new function dlmopen(). This feature is of course,
6124 like most other dynamic loading functionality, not available in statically
6125 linked applications. Implemented by Ulrich Drepper.
6127 * Low-overhead boundary checking variants of string and some stdio functions
6128 were added. These are to be used in conjunction with a gcc patch by
6129 Jakub Jelinek which adds calls to these functions if possible.
6130 Implemented by Jakub Jelinek and Ulrich Drepper.
6132 * Old code for several operating systems and machine architectures that
6133 have not been in working condition in a long time have been removed from
6134 the main source tree maintained by the GNU C Library's maintainers.
6135 These files are now reside in the separate `ports' source module
6136 that is usable as an add-on when building the library.
6140 * New functions `dladdr1' and `dlinfo' in <dlfcn.h> provide more ways to
6141 interrogate the dynamic linker, compatible with the Solaris interface.
6143 * ELF thread-local storage support (TLS) now works on PowerPC and PowerPC64;
6144 implemented by Paul Mackerras, Steven Munroe, and Roland McGrath.
6146 * getifaddrs now uses the netlink interface on Linux to get its information.
6147 Implemented by Thorsten Kukuk.
6149 * getaddrinfo now implements AI_V4MAPPED, AI_ALL, and AI_ADDRCONF.
6150 Implemented by Ulrich Drepper.
6152 * support for non-executable stacks on x86 has been added. Changes mostly
6155 * regex is now much faster for multibyte locales. Changes by Jakub Jelinek
6158 * getaddrinfo now performs destination address selection according to
6163 * Thread-safe interfaces for many functions that access locale data
6164 were added in version 2.3, but these features were omitted from NEWS.
6165 Many functions have variants with an `_l' suffix that take a `locale_t'
6166 object as a parameter rather than consulting the current locale.
6167 The new functions `newlocale', `duplocale', and `freelocale' in <locale.h>
6168 create and maintain `locale_t' objects. Additionally, the new function
6169 `uselocale' sets "the current locale" (as used by functions not so
6170 parameterized) set for an individual thread. These features were added
6171 in version 2.3, implemented by Ulrich Drepper and Roland McGrath.
6173 * The functions getresuid, getresgid, setresuid, and setresgid, which
6174 have long been available on Linux, are now declared in <unistd.h>
6175 and are now also available on the Hurd.
6177 * ELF thread-local storage support (TLS) now works on x86-64.
6179 * The new dynamic string token $LIB is expanded in shared library names.
6180 This normally expands to lib, but on some 64-bit platforms to lib64 instead.
6182 * Aldy Hernandez contributed complete software floating point support for
6183 PowerPC machines with no FPU.
6185 * fexecve is implemented on Linux.
6187 * The `btowc' function should work at least twice as fast due to
6188 specialized callbacks in the iconv modules. Implemented by Bruno Haible.
6190 * With appropriate thread add-ons cancelable functions are now implemented
6191 in libc.so as well. No need to call the function in libpthread. This
6192 change allowed to finally disable the incorrect and expensive handling
6193 of weak definition in ld.so.
6195 * Yet more PLT entries in libc.so have been removed. We finally arrived
6196 at the bare minimum. Startup times improved appropriately.
6198 * Support for the new Linux/x86 system call interface was added. The
6199 AT_SYSINFO auxiliary vector entry is recognized and handled.
6203 * Masahide Washizawa contributed iconv modules for IBM1163 and IBM1164
6206 * iconv (the program and the interface) now accepts empty names (excluding
6207 options like //TRANSLIT) to mean "use charset of current locale".
6209 * localedef can now transliterate characters in strings which are not in
6210 the provided charmap. The information from the input locale is used.
6212 * Prelinking support was added for ELF targets. This requires additional
6213 tools and recent versions of the GNU binutils. Contributed by Jakub Jelinek.
6215 * Read-only stdio streams now use mmap to speed up operation by eliminating
6216 copying and buffer underflows. To use add 'm' to the mode string of
6217 the fopen/fdopen/freopen call. Implemented by Ulrich Drepper.
6219 * The malloc functions were completely rewritten by Wolfram Gloger based
6220 on Doug Lea's malloc-2.7.0.c.
6222 * Isamu Hasegawa contributed a completely new and POSIX-conformant
6223 implementation of regex.
6225 * Bruno Haible upgraded the iconv and locale implementation to support
6228 * Contents of the LC_* and LANG environment variables in the CEN style are
6229 not recognized anymore. It never was used. Change by Ulrich Drepper.
6231 * The runtime (ld.so, libc, libpthread for Linux) now can handle the ELF
6232 thread-local storage (TLS) ABI on some platforms.
6233 Changes by Ulrich Drepper. SH support by Kaz Kojima.
6235 * Bruno Haible contributed iconv converters for ISO-2022-JP-3, SHIFT JIS-X0213,
6236 EUC-JISX0213, and TSCII.
6238 * New header <ifaddrs.h> with functions `getifaddrs' and `freeifaddrs':
6239 BSD-compatible interface for getting all network interface addresses.
6240 Implementation for IPv4 by Roland McGrath.
6242 * Loading of locale data is faster due to the introduction of a locale
6243 archive. Implemented by Roland McGrath and Ulrich Drepper.
6245 * Startup times are significantly reduced by not using exported functions
6246 inside the library itself. Changes by Jakub Jelinek, Roland McGrath,
6249 * Steven Munroe contributed a port to PowerPC64/Linux.
6253 * The Hurd now uses the GNU libio implementation of stdio rather than the
6254 old GNU stdio implementation, and uses a new ABI (libc.so.0.3).
6256 * The Hurd on x86 now has the `ioperm' function and <sys/io.h> header file
6257 with the same behavior as the Linux system call of the same name.
6261 * Stephen Moshier implemented log2, log10, powl and cbrtl for the
6262 128-bit long double format.
6264 * Masahide Washizawa contributed iconv modules for IBM1132, IBM1133, IBM1160,
6265 IBM1161, and IBM1162 charsets.
6267 * Andreas Jaeger contributed a port to x86-64/Linux.
6269 * Peter Bruin contributed a port to PowerPC/Hurd.
6271 * libc functions using I/O streams now can handle wide-oriented streams
6274 * optimizations in the dynamic linker. Binaries created by recent binutils
6275 versions start up quicker due to reduced time spent on relocations.
6277 * Support for use of gcc3 added by Jakub Jelinek and HJ Lu.
6281 * Stephen Moshier implemented cosh, expm1, log1p, acos, sinh, tanh,
6282 asinh, atanh, j0 for the 128-bit long double format.
6284 * Bruno Haible updated all the code handling Unicode in some form to
6285 support Unicode 3.1.
6287 * Speed of regex for single-byte locales is back to previous levels.
6288 Patch by Isamu Hasegawa.
6290 * Alpha, SPARC, and IA-64 now also using floating stacks.
6292 * Startup time of internationalized applications greatly improved through
6293 iconv cache. Use iconvconfig to generate the cache file.
6294 Contributed by Ulrich Drepper.
6296 * The IA-64 specific part of ld.so was rewritten to eliminate some pretty
6297 severe performance problems. Patch by David Mosberger.
6299 * The Hurd port got a lot more functionality like AIO, various stdio
6300 extensions, etc. Mainly done by Roland McGrath.
6302 * mtrace can now lookup symbols in shared libraries.
6306 * Intel's IA-64 math library is largely integrated. It provides fast and
6307 accurate implementatations for most basic and standard math functions
6308 in float, double, and long double format.
6310 * Stephen Moshier implemented j0, j1, jn, y0, y1, yn, lgamma, erf, erfc,
6311 and asin for the 96-bit long double format and asin, log, tan for the
6312 128-bit long double format.
6314 * The beginning of a last-bit accurate math library by IBM Haifa were added.
6315 The basic double functions exist today. Contributed by Abraham Ziv
6316 <ziv@il.ibm.com>, Moshe Olshansky <olshansk@il.ibm.com>, Ealan Henis
6317 <ealan@il.ibm.com>, and Anna Reitman <reitman@il.ibm.com>.
6319 * An asynchronous name lookup library was added. The interface is designed
6320 after POSIX AIO. The proposal was circulated beforehand to get comments.
6321 No negative ones came in. Implemented by Ulrich Drepper.
6323 * Port to S390/64bit contributed by Martin Schwidefsky
6324 <schwidefsky@de.ibm.com>.
6326 * David Mosberger <davidm@hpl.hp.com> implemented the setcontext family
6327 of functions for Linux/IA-64.
6329 * The RPC code is now thread safe. Threads can now use the same service
6330 of different services at the same time. Patch by Eric Norum
6331 <eric.norum@usask.ca> with some help by Ulrich Drepper.
6333 * Martin Schwidefsky <schwidefsky@de.ibm.com> implemented the setcontext
6334 family of functions for Linux/S390.
6336 * Ulrich Drepper <drepper@redhat.com> implemented the setcontext family
6337 of functions for Linux/x86.
6339 * Port to Linux/CRIS contributed by Axis Communications.
6343 * Lots of headers were cleaned up. Using the tool in the conform/ subdir
6344 we can now check for namespace violations and missing declarations. The
6345 result is that almost all headers are now Unix-compliant (as defined in
6346 the upcoming XPG6). The negative side is that some programs might need
6347 corrections, too, if they depend on the incorrect form of the headers in
6348 previous versions which defined too many symbols and included too many
6351 * regex now handles multibyte character sets correctly.
6352 Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>.
6354 * iconv (the program) does now conform to the upcoming XPG6 and handles
6355 charmaps. Instead of the charset names the path of charmaps can be
6356 provided and the conversion happens based on this data.
6357 Contributed by Ulrich Drepper.
6359 * The locale program now provides detailed information about the installed
6364 only lists the names of the supported locales
6368 provides details such as country, language, and codeset name.
6369 Contributed by Ulrich Drepper.
6373 * The gencat program now parses the input file according to the charset
6374 selected by the LC_CTYPE category. This is important for stateful
6375 character sets. To make generating catalogs easier there is a way
6376 to overwrite the charset selected by the locale: before the first
6377 message or $ quote line the catalog can contain a line like
6379 $ codeset=ISO-8859-2
6381 to select the charset (ISO-8859-2 in this case).
6383 Implemented by Shinya Hanataka and Ulrich Drepper.
6385 * New codeset conversion modules: IBM-922 (Estonia PC codeset),
6386 IBM-1124 (Ukraine PC codeset), IBM-1129 (Vietnamese PC codeset).
6387 Contributed by Masahide Washizawa <washi@jp.ibm.com>.
6389 * Optimized string functions for Alpha ev6 and ev67 by Richard Henderson
6390 <rth@redhat.com> and Rick Gorton <rick.gorton@alpha-processor.com>.
6392 * The LANGUAGE environment variable is now ignored unless the locale is
6393 changed from the default "C" locale.
6395 * The usual bug fixes.
6399 * Greg McGary added runtime support for bounds checking using gcc's
6400 new -fbounded-pointers option. ix86 target is complete. PowerPC
6403 * Thorsten Kukuk added secure mode support to nscd.
6405 * The Berkeley db libraries have been removed.
6407 Related, the nss_db module is now in a separate package since it
6408 obviously requires a database library being available.
6410 * Wide character I/O streams implemented by Ulrich Drepper.
6412 * Functions from the extended socket API added by Ulrich Drepper.
6414 * Functions feenableexcept and fedisableexcept to control the
6415 behaviour of individual exceptions have been added by Andreas Jaeger.
6417 * ldconfig program added by Andreas Jaeger and Jakub Jelinek.
6419 * The resolver code has been updated from bind 8.2.3-T5B which supports
6420 threads. The integration was done by Andreas Jaeger, Adam D. Bradley,
6423 This change could in some situations effect backward compatibility. Since
6424 now `_res' is a thread-local instead of a global variable, modifying it
6425 in one thread does not have any effect in other threads.
6427 The resolver library was also extended to allow IPv6 as the transport
6428 protocol for the requests. This work was done by Stig Venaas.
6430 * Compatibility code for K&R C compilers has been removed from the
6431 header files. A ISO C compiler is needed to use the library
6432 (conforming to either C89 or C99 standard).
6434 * Complete rewrite of the localedef program to support multibyte character
6435 sets. Implement handling of ISO 14651 and ISO 14652. Rewrite strcoll,
6436 strxfrm, wcscoll, and wcsxfrm functions. Make isw*() functions work.
6437 Implemented by Ulrich Drepper.
6439 Bruno Haible significantly improved the generation and use of the data
6440 structures for the wide character tables.
6442 * Plural handling in gettext implemented by Ulrich Drepper.
6444 * The utmp daemon has been removed.
6446 * The port to MIPS-Linux has been finished by Andreas Jaeger.
6448 * A port to Hitachi SH3 and SH4 has been contributed by Kazumoto Kojima
6451 * POSIX clocks and timers implemented by Kaz Kylheku and Ulrich Drepper.
6453 * POSIX barriers implemented by Kaz Kylheku.
6455 * POSIX spawn function family implemented by Ulrich Drepper.
6457 * POSIX spinlocks are now available.
6459 * Timed wait functions for mutex, rwlock, and semaphores are implemented.
6461 * the configure option --enable-kernel=X.Y.Z allows to strip out
6462 compatibility for kernel versions before X.Y.Z. This is currently only
6463 implemented for Linux.
6465 * the sockaddr_in6 structure changed. The IPv6 working group added a new
6466 field sin6_scope_id. This means that all programs using IPv6 should be
6467 recompiled. Don't expect binary compatibility with previous glibc
6470 * various conversion modules for IBM character sets contributed by
6473 * IA-64 port by Jes Sorensen and HJ Lu.
6487 * New ISO C 9x function _Exit, imaxabs, and imaxdiv are added.
6489 * New xdr functions are added; some rpc functions are now 64bit clean.
6491 * Fixed a number of bugs and memory leaks (especially in NIS+ code).
6493 * Fixed known incompatibilities with glibc 2.0.
6495 * New functions lock64, strchrnul, rawmemchr, getutmp and getutmpx.
6497 * Optimized a number of functions (especially the ELF dynamic loader).
6499 * Update timezone data files.
6501 * lots of charmaps corrections
6503 * some new locale definitions and charmaps
6508 * Richard Henderson corrected size of struct timeval on Linux/Alpha to
6509 conform to POSIX member type requirements. Symbol versions have been
6510 adjusted as needed within the library, and for direct use by applications,
6511 but there is potential for problems if third-party libraries use
6512 struct timeval as part of their interface. This does not present
6513 a problem for X and other "essential" system libraries.
6515 * An additional locale model to support C++ Standard Library locale
6516 model and probably more was implemented by Ulrich Drepper.
6518 * Eric Youngdale and Ulrich Drepper implemented versioning of objects on
6521 * Miles Bader provided the `argp' function family to support hierarchical
6522 command line argument parsing, layered on top of getopt.
6524 * strtod accepts new hexadecimal floating-point format from ISO C 9X.
6526 * printf has two new specifiers %a and %A to print hexadecimal flaoting-point
6529 * scanf recognizes the %a and %A format for scanning floating point numbers.
6531 * the new headers <stdint.h> and <inttypes.h> from ISO C 9X provides
6532 information and interfaces for the available integer types.
6534 * about 130 new math functions were added to implement the ISO C9x math
6537 * the new header <complex.h> contains definitions of the complex math
6538 functions from ISO C 9X.
6540 * the new header <tgmath.h> defines generic macros to use complex or
6541 real valued functions.
6543 * Thorsten Kukuk provided an implementation for NIS+, securelevel 0, 1 and 2.
6545 * Andreas Jaeger provided a test suite for the math library.
6547 * Mark Kettenis implemented the utmpx interface and an utmp daemon.
6549 * Ulrich Drepper added character set conversion functions (iconv).
6551 * Optimized string functions have been added.
6553 * The localedata addon is now part of glibc.
6555 * An implementation of profiling shared libraries was added by Ulrich Drepper.
6557 * Thorsten Kukuk and Ulrich Drepper provided an implementation for a caching
6558 daemon for NSS (nscd).
6560 Missing a better place here are some numbers on improvements. Under
6561 Linux 2.1.125 un-tar-ing the kernel sources takes
6565 using local files 12.19s 6.88s 22.91s
6567 using NIS 13.92s 8.91s 26.34s
6569 using NIS & nscd 10.37s 7.34s 25.30s
6571 using NIS+ 27.57s 30.37s 640.46s
6573 using NIS+ & nscd 10.25s 7.83s 26.51s
6575 using NIS & old nscd [1] 13.83s 8.32s 29.60s
6577 Keep in mind that non-namelookup related operations dominate above times.
6578 It was just a common complain that using NIS+ unpacking the kernel is
6581 [1] The old nscd implementation is not available anymore since it was
6582 distributed with glibc up to version 2.0.98 and thus is now replaced.
6584 * Tim Waugh provided an implementation of the POSIX.2 wordexp function family.
6586 * Mark Kettenis provided a Hesiod NSS module.
6588 * The ELF dynamic loader knows how to process dynamic string tokens ($ORIGIN
6589 and $PLATFORM) in RPATHs and similar strings (Ulrich Drepper).
6591 * rcmd can now handle netgroups (Dick Streefland).
6593 * A port to the ARM was contributed by Phil Blundell, Pat Beirne and Scott
6596 * Support for the IPv6 protocol has been added to the socket API, as per the
6597 latest draft standards.
6599 * Support for Linux 2.2 has been added.
6601 * Interface changes relative to the latest 2.0.x release:
6602 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
6603 addseverity NEW: Unix98
6604 alphasort64 NEW: LFS
6605 argp_err_exit_status NEW: argp, GNU ext
6606 argp_error NEW: argp, GNU ext
6607 argp_failure NEW: argp, GNU ext
6608 argp_help NEW: argp, GNU ext
6609 argp_parse NEW: argp, GNU ext
6610 argp_program_bug_address NEW: argp, GNU ext
6611 argp_program_version NEW: argp, GNU ext
6612 argp_program_version_hook NEW: argp, GNU ext
6613 argp_state_help NEW: argp, GNU ext
6614 argp_usage NEW: argp, GNU ext
6615 authdes_create NEW: Secure RPC
6616 authdes_getucred NEW: Secure RPC
6617 authdes_pk_create NEW: Secure RPC
6618 backtrace NEW: GNU ext.
6619 backtrace_symbols NEW: GNU ext.
6620 backtrace_symbols_fd NEW: GNU ext.
6622 cacosf NEW: ISO C 9x
6623 cacosh NEW: ISO C 9x
6624 cacoshf NEW: ISO C 9x
6625 cacoshl NEW: ISO C 9x
6626 cacosl NEW: ISO C 9x
6633 casinf NEW: ISO C 9x
6634 casinh NEW: ISO C 9x
6635 casinhf NEW: ISO C 9x
6636 casinhl NEW: ISO C 9x
6637 casinl NEW: ISO C 9x
6639 catanf NEW: ISO C 9x
6640 catanh NEW: ISO C 9x
6641 catanhf NEW: ISO C 9x
6642 catanhl NEW: ISO C 9x
6643 catanl NEW: ISO C 9x
6644 cbc_crypt NEW: Secure RPC
6648 ccoshf NEW: ISO C 9x
6649 ccoshl NEW: ISO C 9x
6655 cimagf NEW: ISO C 9x
6656 cimagl NEW: ISO C 9x
6657 clearerr_locked REMOVED
6658 clntunix_create NEW: sunrpc ext
6660 clog10 NEW: ISO C 9x
6661 clog10f NEW: ISO C 9x
6662 clog10l NEW: ISO C 9x
6672 cprojf NEW: ISO C 9x
6673 cprojl NEW: ISO C 9x
6675 crealf NEW: ISO C 9x
6676 creall NEW: ISO C 9x
6681 csinhf NEW: ISO C 9x
6682 csinhl NEW: ISO C 9x
6685 csqrtf NEW: ISO C 9x
6686 csqrtl NEW: ISO C 9x
6690 ctanhf NEW: ISO C 9x
6691 ctanhl NEW: ISO C 9x
6693 des_setparity NEW: Secure RPC
6694 ecb_crypt NEW: Secure RPC
6695 endutxent NEW: Unix98
6697 exp10f NEW: ISO C 9x
6698 exp10l NEW: ISO C 9x
6702 fattach NEW: STREAMS
6703 fdetach NEW: STREAMS
6707 feclearexcept NEW: ISO C 9x
6708 fegetenv NEW: ISO C 9x
6709 fegetexceptflag NEW: ISO C 9x
6710 fegetround NEW: ISO C 9x
6711 feholdexcept NEW: ISO C 9x
6713 feraiseexcept NEW: ISO C 9x
6714 ferror_locked REMOVED
6715 fesetenv NEW: ISO C 9x
6716 fesetexceptflag NEW: ISO C 9x
6717 fesetround NEW: ISO C 9x
6718 fetestexcept NEW: ISO C 9x
6719 feupdateenv NEW: ISO C 9x
6720 fflush_locked REMOVED
6724 fgets_unlocked NEW: GNU ext.
6725 fileno_locked REMOVED
6737 fputc_locked REMOVED
6738 fputs_unlocked NEW: GNU ext.
6739 fread_unlocked NEW: GNU ext.
6744 fstatvfs NEW: Unix98
6748 ftruncate64 NEW: LFS
6750 fwrite_unlocked NEW: GNU ext.
6751 gai_strerror NEW: IPv6
6755 getchar_locked REMOVED
6757 getdate_err NEW: Unix98
6758 getdate_r NEW: GNU ext.
6760 getnameinfo NEW: IPv6
6761 getnetname NEW: Secure RPC
6762 getpmsg NEW: STREAMS
6763 getpt NEW: Unix98 PTY
6764 getrlimit64 NEW: LFS
6765 getutxent NEW: Unix98
6766 getutxid NEW: Unix98
6767 getutxline NEW: Unix98
6768 glob64 NEW: GNU ext.
6769 globfree64 NEW: GNU ext.
6770 gnu_get_libc_release NEW: GNU ext.
6771 gnu_get_libc_version NEW: GNU ext.
6772 grantpt NEW: Unix98 PTY
6773 host2netname NEW: Secure RPC
6775 iconv_close NEW: iconv
6776 iconv_open NEW: iconv
6777 if_freenameindex NEW: IPv6
6778 if_indextoname NEW: IPv6
6779 if_nameindex NEW: IPv6
6780 if_nametoindex NEW: IPv6
6781 in6addr_any NEW: IPv6
6782 in6addr_loopback NEW: IPv6
6783 inet6_isipv4mapped NEW: IPv6
6784 isastream NEW: STREAMS
6785 iswblank NEW: GNU ext.
6786 key_decryptsession NEW: Secure RPC
6787 key_decryptsession_pk NEW: Secure RPC
6788 key_encryptsession NEW: Secure RPC
6789 key_encryptsession_pk NEW: Secure RPC
6790 key_gendes NEW: Secure RPC
6791 key_get_conv NEW: Secure RPC
6792 key_secretkey_is_set NEW: Secure RPC
6793 key_setnet NEW: Secure RPC
6794 key_setsecret NEW: Secure RPC
6795 llrint NEW: ISO C 9x
6796 llrintf NEW: ISO C 9x
6797 llrintl NEW: ISO C 9x
6798 llround NEW: ISO C 9x
6799 llroundf NEW: ISO C 9x
6800 llroundl NEW: ISO C 9x
6805 lrintf NEW: ISO C 9x
6806 lrintl NEW: ISO C 9x
6807 lround NEW: ISO C 9x
6808 lroundf NEW: ISO C 9x
6809 lroundl NEW: ISO C 9x
6811 makecontext NEW: Unix98
6812 mempcpy NEW: GNU ext.
6815 modify_ldt NEW: kernel
6819 nearbyint NEW: ISO C 9x
6820 nearbyintf NEW: ISO C 9x
6821 nearbyintl NEW: ISO C 9x
6822 netname2host NEW: Secure RPC
6823 netname2user NEW: Secure RPC
6824 nexttoward NEW: ISO C 9x
6825 nexttowardf NEW: ISO C 9x
6826 nexttowardl NEW: ISO C 9x
6830 passwd2des NEW: Secure RPC
6832 pow10f NEW: GNU ext.
6833 pow10l NEW: GNU ext.
6836 printf_size NEW: GNU ext.
6837 printf_size_info NEW: GNU ext.
6838 profil_counter REMOVED
6839 pthread_mutexattr_getkind_np REPLACED
6840 pthread_mutexattr_setkind_np REPLACED
6841 ptsname NEW: Unix98 PTY
6842 ptsname_r NEW: Unix98 PTY
6844 putchar_locked REMOVED
6845 putgrent NEW: GNU ext.
6847 putpmsg NEW: STREAMS
6848 pututxline NEW: Unix98
6852 readdir64_r NEW: LFS
6853 remquo NEW: ISO C 9x
6854 remquof NEW: ISO C 9x
6855 remquol NEW: ISO C 9x
6857 roundf NEW: ISO C 9x
6858 roundl NEW: ISO C 9x
6860 scalbln NEW: ISO C 9x
6861 scalblnf NEW: ISO C 9x
6862 scalblnl NEW: ISO C 9x
6864 sendfile NEW: kernel
6865 setcontext NEW: Unix98
6866 setrlimit64 NEW: LFS
6867 setutxent NEW: Unix98
6869 sigignore NEW: Unix98
6870 sigqueue NEW: POSIX.1b
6871 sigrelse NEW: Unix98
6872 sigset NEW: POSIX.1b
6873 sigtimedwait NEW: POSIX.1b
6874 sigwaitinfo NEW: POSIX.1b
6875 sincos NEW: GNU ext.
6876 sincosf NEW: GNU ext.
6877 sincosl NEW: GNU ext.
6881 strcasestr NEW: GNU ext.
6882 strtoimax NEW: ISO C 9x
6883 strtoumax NEW: ISO C 9x
6884 strverscmp NEW: GNU ext.
6885 svcauthdes_stats NEW: Secure RPC
6886 svcunix_create NEW: sunrpc etx
6887 svcunixfd_create NEW: sunrpc ext
6888 swapcontext NEW: Unix98
6889 tcgetsid NEW: Unix98 PTY
6890 tdestroy NEW: GNU ext.
6891 tgamma NEW: ISO C 9x
6892 tgammaf NEW: ISO C 9x
6893 tgammal NEW: ISO C 9x
6897 truncf NEW: ISO C 9x
6898 truncl NEW: ISO C 9x
6900 unlockpt NEW: Unix98 PTY
6901 updwtmpx NEW: Unix98
6902 user2netname NEW: Secure RPC
6903 utmpxname NEW: Unix98
6904 versionsort NEW: GNU ext.
6905 versionsort64 NEW: GNU ext.
6907 wcscasecmp NEW: GNU ext.
6908 wcsncasecmp NEW: GNU ext.
6909 wcsnlen NEW: GNU ext.
6910 wcstoimax NEW: ISO C 9x
6911 wcstoll NEW: ISO C 9x
6912 wcstoull NEW: ISO C 9x
6913 wcstoumax NEW: ISO C 9x
6915 wordexp NEW: POSIX.2
6916 wordfree NEW: POSIX.2
6917 write_profiling REMOVED
6918 xdecrypt NEW: Secure RPC
6919 xdr_authdes_cred NEW: Secure RPC
6920 xdr_authdes_verf NEW: Secure RPC
6921 xdr_cryptkeyarg NEW: Secure RPC
6922 xdr_cryptkeyarg2 NEW: Secure RPC
6923 xdr_cryptkeyres NEW: Secure RPC
6924 xdr_getcredres NEW: Secure RPC
6925 xdr_key_netstarg NEW: Secure RPC
6926 xdr_key_netstres NEW: Secure RPC
6927 xdr_keybuf NEW: Secure RPC
6928 xdr_keystatus NEW: Secure RPC
6929 xdr_netnamestr NEW: Secure RPC
6930 xdr_sizeof NEW: Secure RPC
6931 xdr_unixcred NEW: sunrpc ext
6932 xencrypt NEW: Secure RPC
6933 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
6944 * inet_ntoa is thread-safe
6946 * updwtmp is moved from libutil to libc
6948 * rewrite of cbrt function
6950 * update of timezone data
6964 * add atoll function
6966 * fix complex problems in Berkeley DB code
6968 * fix math functions
6972 * fixed lots of header problems (especially Linux/GNU specific)
6974 * dynamic loader preserves all registers
6976 * Roland McGrath provided support for handling of auxiliary objects in
6977 the ELF dynamic loader.
6979 * support for parallel builds is improved
6983 * GNU extensions are no longer declared by default. To enable them you
6984 must define the macro `_GNU_SOURCE' in your program or compile with
6987 * The library has changed from using GNU ld symbol aliases to using weak
6988 symbols where available. The ELF object file format supports weak
6989 symbols; GNU ld also supports weak symbols in the a.out format. (There
6990 is also now support for other GNU ld extensions in ELF. Use the
6991 `--with-elf' option to configure to indicate you have ELF, and
6992 `--with-gnu-ld' if using GNU ld.) This change resulted in the deletion
6993 of many files which contained only symbol aliases, reducing the size of
6994 the source and the compiled library; many other files were renamed to
6995 less cryptic names previously occupied by the symbol alias files.
6996 There is a new header file <elf.h> for programs which operate on
6997 files in the ELF format.
6999 * Converted to Autoconf version 2, so `configure' has more options.
7000 Run `configure --help' to see the details.
7002 * The library can now be configured to build profiling, highly-optimized
7003 (but undebuggable), and/or shared libraries (ELF with GNU ld only). The
7004 `--enable-profile', `--enable-omitfp', and `--enable-shared' options to
7005 `configure' enable building these extra libraries. The shared library is
7006 built by default when using both ELF and GNU ld. When shared libraries
7007 are enabled, the new library `-ldl' is available for arbitrary run-time
7008 loading of shared objects; its interface is defined in <dlfcn.h>. The
7009 new header file <link.h> gives access to the internals of the run-time
7010 dynamic linker, `ld.so'. The shell script `ldd' is similar to the
7011 application of same name on other systems and it provides information
7012 about dynamically linked binaries.
7014 * The C library now provides the run-time support code for profiling
7015 executables compiled with `-pg'. Programs can control the profiling code
7016 through the interface in <sys/gmon.h>. The `gmon.out' files written by
7017 the GNU C library can be read only by GNU `gprof' (from GNU binutils);
7018 the support for this file format was contributed by David Mosberger-Tang.
7020 * The math code has been replaced with a math library based on fdlibm from
7021 Sun, and modified by JT Conklin and Ulrich Drepper with i387 support, by
7022 Ian Taylor with `float' functions and by Ulrich Drepper with `long double'
7023 functions. The math functions now reside in a separate library, so
7024 programs using them will need to use `-lm' their linking commands.
7026 * John C. Bowman contributed optimized ix87 assembler inline functions.
7028 * Ulrich Drepper has contributed support for an `/etc/nsswitch.conf'
7029 mechanism similar to that found in Solaris 2. This is now used for the
7030 group, passwd, hosts, networks, services, protocols, rpc, ethers,
7031 shadow, netgroup, publickey, and alias databases. The `nsswitch.conf'
7032 file controls what services are used for each individual database. This
7033 works by loading shared libraries with names specified in `nsswitch.conf',
7034 so service modules can be changed or added at any time without even
7035 relinking any program. Currently there are the file, db, and NIS based
7036 NSS services available.
7038 * The new functions `strtoq' and `strtouq' parse integer values from
7039 strings, like `strtol' and `strtoul', but they return `long long int' and
7040 `unsigned long long int' values, respectively (64-bit quantities).
7042 * The new functions `strtof' and `strtold' parse floating-point values from
7043 strings, like `strtod', but they return `float' and `long double' values,
7044 respectively (on some machines `double' and `long double' are the same).
7046 * Ulrich Drepper has contributed new implementations of the floating-point
7047 printing and reading code used in the `printf' family of functions and
7048 `strtod', `strtof', and `strtold'. These new functions are perfectly
7049 accurate, and much faster than the old ones.
7051 * The implementation of the POSIX locale model was completely rewritten by
7052 Ulrich Drepper. This includes the new programs `localedef' and `locale'
7053 to compile the POSIX locale definition.
7055 * The former dummy implementations of the strcoll and strxfrm function are
7056 now replaced by fully functional code contributed by Ulrich Drepper. The
7057 collation information comes from the POSIX locale definitions.
7059 * The new header <langinfo.h> defines an interface for accessing
7060 various locale-dependent data (using the locale chosen with `setlocale').
7062 * Ulrich Drepper has contributed a new suite of functions for operation on
7063 wide-character and multibyte-character strings, in <wchar.h>;
7064 and classification and case conversion of wide characters, in <wctype.h>.
7065 These new functions are conforming to the ISO C, Amendment 1 specification.
7067 * There is now a second implementation of the standard I/O library available.
7068 It comes from GNU libg++ as was written by Per Bothner, heavily modified
7069 by Hongjiu Lu and made thread safe by Ulrich Drepper.
7071 * You can now use positional parameter specifications in format strings
7072 for the `printf' and `scanf' families of functions. For example,
7073 `printf ("Number %2$d, Mr %1$s\n", "Jones", 6);'' prints
7074 ``Number 6, Mr Jones''. This is mainly useful when providing different
7075 format strings for different languages, whose grammars may dictate
7076 different orderings of the values being printed. To support this
7077 feature, the interface for `register_printf_handler' has changed; see
7078 the header file <printf.h> for details.
7080 * The `printf' and `scanf' families of functions now understand a new
7081 formatting flag for numeric conversions: the ' flag (e.g. %'d or %'f) says
7082 to group numbers as indicated by the locale; for `scanf' and friends, this
7083 says to accept as valid only a number with all the proper grouping
7084 separators in the right places. In the default "C" locale, numbers are
7085 not grouped; but locales for specific countries will define the usual
7086 conventions (i.e. separate thousands with `,' in the US locale).
7088 * The pgrp functions have been regularized, slightly incompatibly but much
7089 less confusingly. The core functions are now `getpgid' and `setpgid',
7090 which take arguments for the PID to operate on; the POSIX.1 `getpgrp' (no
7091 argument) and BSD `setpgrp' (identical to `setpgid') functions are
7092 provided for compatibility. There is no longer an incompatible `getpgrp'
7093 with an argument declared under _BSD_SOURCE; no BSD code uses it.
7095 * The new header file <fts.h> and suite of functions simplify programs that
7096 operate on directory trees. This code comes from 4.4 BSD.
7098 * The resolver code has been updated from the BIND 4.9.5-P1 release.
7099 Parts of the code were heavily modified by Ulrich Drepper to fit in the
7100 NSS scheme used in glibc.
7102 * There is a new malloc debugging hook `__memalign_hook'.
7104 * There are new typedefs `ushort' for `unsigned short int' and `uint' for
7105 `unsigned int' in <sys/types.h>. These are for compatibility only and
7106 their use is discouraged.
7108 * The `-lmcheck' library to enable standard malloc debugging hooks is now
7109 done differently, so that it works even without GNU ld.
7111 * New function `euidaccess' checks allowed access to a file like `access',
7112 but using the effective IDs instead of the real IDs.
7114 * The time zone data files have been updated for the latest and greatest
7115 local time conventions of the countries of the world.
7117 * The new function `dirfd' extracts the file descriptor used by a DIR stream;
7120 * The new functions `ecvt', `fcvt', and `gcvt' provide an obsolete interface
7121 for formatting floating-point numbers. They are provided only for
7122 compatibility; new programs should use `sprintf' instead. There are
7123 also equivalent function for the `long double' floating-point type and
7124 all functions also exist in a reentrant form.
7126 * The new auxiliary library `-lutil' from 4.4 BSD contains various
7127 functions for maintaining the login-record files (primarily of use to
7128 system programs such as `login'), and convenient functions for
7129 allocating and initializing a pseudo-terminal (pty) device.
7131 * Ulrich Drepper has contributed new support for System V style
7132 shared memory and IPC on systems that support it.
7134 * Ulrich Drepper has contributed several miscellaneous new functions found
7135 in System V: The `hsearch' family of functions provide an effective
7136 implementation of hash tables; `a64l' and `l64a' provide a very simple
7137 binary to ASCII mapping; `drand48' and friends provide a 48-bit random
7140 * Ulrich Drepper has contributed new reentrant counterparts for the
7141 `random' and `hsearch' families of functions; `random_r', `hsearch_r', etc.
7143 * Ulrich Drepper has contributed new, highly-optimized versions of several
7144 string functions for the i486/Pentium family of processors.
7146 * Ulrich Drepper has updated the Linux-specific code, based largely
7147 on work done in Hongjiu Lu's version of GNU libc for Linux.
7148 The GNU library now supports Linux versions 2.0.10 and later,
7149 using the ELF object file format (i[3456]86-*-linux).
7151 * Andreas Schwab has ported the C library to Linux/m68k (m68k-*-linux).
7153 * David Mosberger-Tang and Richard Henderson have ported the C library
7154 to Linux/Alpha (alpha-*-linux). Richard Henderson contributed the
7155 dynamic linking support for ELF/Alpha.
7157 * Richard Henderson contributed several Alpha optimized assembler function
7158 for arithmetic and string handling.
7160 * Ulrich Drepper has contributed a new set of message catalog functions to
7161 support multiple languages using the <libintl.h> interface, for use with
7162 his new package GNU gettext. Translation volunteers have contributed
7163 catalogs of the library's messages in Spanish, German, and Korean.
7165 * For compatibility with XPG4, Ulrich Drepper has contributed the `gencat'
7166 program and the `catgets' function for reading the catalog files it
7167 creates. (The <libintl.h> interface is preferred; we include the
7168 <nl_types.h> interface using `catgets' only for source compatibility with
7169 programs already written to use it.)
7171 * New header file <values.h> gives SVID-compatible names for <limits.h>
7174 * Various new macros, declarations, and small header files for compatibility
7177 * New function `group_member' is a convenient way to check if a process has
7178 a given effective group ID.
7180 * When using GCC 2.7 and later, the socket functions are now declared in a
7181 special way so that passing an argument of type `struct sockaddr_in *',
7182 `struct sockaddr_ns *', or `struct sockaddr_un *' instead of the generic
7183 `struct sockaddr *' type, does not generate a type-clash warning.
7185 * New function `error' declared in header file <error.h> is a convenient
7186 function for printing error messages and optionally exiting; this is the
7187 canonical function used in GNU programs. The new functions `err', `warn',
7188 and friends in header file <err.h> are the canonical 4.4 BSD interface for
7189 doing the same thing.
7191 * The <glob.h> interface has several new flags from 4.4 BSD that extend the
7192 POSIX.2 `glob' function to do ~ and {...} expansion.
7194 * New function `unsetenv' complements `setenv' for compatibility with 4.4 BSD.
7195 `clearenv' which is used in POSIX.9 is also available.
7197 * New function `getsid' returns session ID number on systems that support it.
7199 * We have incorporated the 4.4 BSD `db' library (version 1.85). New header
7200 files <db.h> and <mpool.h> provide a rich set of functions for several
7201 types of simple databases stored in memory and in files, and <ndbm.h> is
7202 an old `ndbm'-compatible interface using the `db' functions. Link with
7203 `-ldb' to get these functions.
7205 * New macro `strdupa' copies a string like `strdup', but uses local stack
7206 space from `alloca' instead of dynamic heap space from `malloc'.
7208 * New function `strnlen' is like `strlen' but searches only a given maximum
7209 number of characters for the null terminator. `stpncpy', `strndup' and
7210 `strndupa' are similar variants for the `stpcpy', `strdup' and `strdupa'
7213 * New function `statfs' in header <sys/statfs.h>.
7215 * The new <argz.h> and <envz.h> interfaces contributed by Miles Bader
7216 provide convenient functions for operating on blocks of null-terminated
7219 * A new suite of functions in <utmp.h> handle all the details of reading
7220 and writing the utmp file.
7222 * An implementation of the NIS/YP(tm) based NSS service was contributed by
7225 * Paul Eggert and Ulrich Drepper modified the `strftime' function to be
7226 completely POSIX compliant and also implemented the extended functionality
7227 to handle alternate digit representation and alternate era date formats.
7229 * Ulrich Drepper provided an implementation of the `strptime' function
7230 defined in XPG4.2 which transforms a string into a `struct tm' value.
7232 * Paul Eggert provided the tzselect shell script as part of the timezone
7233 code. The shell script makes it easy to select the correct timezone
7236 * The implementation of the malloc family of functions is completely replaced
7237 by a new implementation by Doug Lea with many improvements by Wolfram Gloger.
7238 The implementation uses the mmap function (if available) and it is
7239 optimized for the use in multi threaded programs.
7241 * Ulrich Drepper contributed a MD5 "encryption" for the crypt family of
7242 functions. This new functionality is usable by specifying a special
7243 salt string and it is compatible with implementation on *BSD systems.
7245 * Lots of functions from the XPG4.2 standard were added by Ulrich Drepper:
7246 `getsubopt' to handle second level command line options, `bsd_signal'
7247 to access BSD style `signal' functionality, the obsolete `regexp' style
7250 * the `lchown' function is available on system which support this
7253 * The implementation of the shadow password handling function was contributed
7256 * David Mosberger-Tang changed the SunRPC implementation to be 64bit safe.
7258 * POSIX.1g support was added. The <sys/select.h> header is available,
7259 `isfdtype' and `pselect' are implemented. Craig Metz contributed an
7260 implementation of `getaddrinfo'.
7264 * For cross-compilation you should now set `BUILD_CC' instead of `HOST_CC'.
7266 * New header file <fstab.h> and new functions `getfsspec', `getfsent' and
7267 friends, for parsing /etc/fstab. This code comes from 4.4 BSD.
7269 * The new function `daemon' from 4.4 BSD is useful for server programs that
7270 want to put themselves in the background.
7272 * Joel Sherrill has contributed support for several standalone boards that
7273 run without an operating system.
7275 * `printf', `scanf' and friends now accept a `q' type modifier for long
7276 long int as well as `ll'. Formats using these might be `%qu' or `%lld'.
7278 * All of the code taken from BSD (notably most of the math and networking
7279 routines) has been updated from the BSD 4.4-Lite release.
7281 * The resolver code has been updated from the BIND-4.9.3-BETA9 release.
7283 * The new functions `getdomainname' and `setdomainname' fetch or change the
7284 YP/NIS domain name. These are system calls which exist on systems which
7287 * The time zone data files have been updated for the latest international
7290 * The SunRPC programs `portmap' and `rpcinfo' are now installed in
7291 $(sbindir) (usually /usr/local/sbin) instead of $(bindir).
7295 * The C library now includes support for Sun RPC, from Sun's free
7296 RPCSRC-4.0 distribution. The `portmap', `rpcinfo', and `rpcgen' programs
7297 are included. (There is still no support for YP.)
7299 * Tom Quinn has contributed a port of the C library to SGI machines running
7300 Irix 4 (mips-sgi-irix4).
7302 * The new `lockf' function is a simplified interface to the locking
7303 facilities of `fcntl', included for compatibility.
7305 * New time functions `timegm', `timelocal', and `dysize' for compatibility.
7307 * New header file <sys/timeb.h> and new function `ftime' for compatibility.
7309 * New header files <poll.h> and <sys/poll.h> and new function `poll' for
7312 * The error message printed by `assert' for a failed assertion now includes
7313 the name of the program (if using GNU ld) and the name of the calling
7314 function (with versions of GCC that support this).
7316 * The `psignal' function is now declared in <signal.h>, not <stdio.h>.
7318 * The library now includes the <sys/mman.h> header file and memory
7319 management functions `mmap', `munmap', `mprotect', `msync', and
7320 `madvise', on systems that support those facilities.
7322 * The interface for `mcheck' has changed slightly: the function called to
7323 abort the program when an allocation inconsistency is detected now takes
7324 an argument that indicates the type of failure. The new function
7325 `mprobe' lets you request a consistency check for a particular block at
7326 any time (checks are normally done only when you call `free' or `realloc'
7329 * It is now possible to easily cross-compile the C library, building on one
7330 system a library to run on another machine and/or operating system. All
7331 you need to do is set the variable `HOST_CC' in `configparms' to the
7332 native compiler for programs to run on the machine you are building on (a
7333 few generator programs are used on Unix systems); set `CC' to the
7336 * The new function `fexecve' (only implemented on the GNU system) executes
7337 a program file given a file descriptor already open on the file.
7341 * Brendan Kehoe has contributed most of a port to the DEC Alpha
7342 running OSF/1 (alpha-dec-osf1). He says it is 75% complete.
7344 * You can set the variable `libprefix' in `configparms' to specify a prefix
7345 to be prepended to installed library files; this makes it easy to install
7346 the GNU C library to be linked as `-lgnuc' or whatever.
7348 * The new `stpncpy' is a cross between `stpcpy' and `strncpy': It
7349 copies a limited number of characters from a string, and returns the
7350 address of the last character written.
7352 * You no longer need to check for whether the installed `stddef.h' is
7353 compatible with the GNU C library. configure now checks for you.
7355 * You can now define a per-stream `fileno' function to convert the
7356 stream's cookie into an integral file descriptor.
7358 * ``malloc (0)'' no longer returns a null pointer. Instead, it
7359 allocates zero bytes of storage, and returns a unique pointer which
7360 you can pass to `realloc' or `free'. The behavior is undefined if
7361 you dereference this pointer.
7363 * The C library now runs on Sony NEWS m68k machines running either
7364 NewsOS 3 or NewsOS 4.
7366 * The new `syscall' function is a system-dependent primitive function
7367 for invoking system calls. It has the canonical behavior on Unix
7368 systems, including unreliable return values for some calls (such as
7369 `pipe', `fork' and `getppid').
7371 * The error code `EWOULDBLOCK' is now obsolete; it is always defined
7372 to `EAGAIN', which is the preferred name. On systems whose kernels
7373 use two distinct codes, the C library now translates EWOULDBLOCK to
7374 EAGAIN in every system call function.
7378 * The GNU C Library Reference Manual is now distributed with the library.
7379 `make dvi' will produce a DVI file of the printed manual.
7380 `make info' will produce Info files that you can read on line using C-h i
7381 in Emacs or the `info' program.
7382 Please send comments on the manual to bug-glibc-manual@gnu.org.
7384 * The library now supports SVR4 on i386s (i386-unknown-sysv4).
7386 * Brendan Kehoe has contributed a port to Sun SPARCs running Solaris 2.
7388 * Jason Merrill has contributed a port to the Sequent Symmetry running
7389 Dynix version 3 (i386-sequent-dynix).
7391 * The library has been ported to i386s running SCO 3.2.4 (also known as SCO
7392 ODT 2.0; i386-unknown-sco3.2.4) or SCO 3.2 (i386-unknown-sco3.2).
7394 * New function `memory_warnings' lets you arrange to get warnings when
7395 malloc is running out of memory to allocate, like Emacs gives you.
7397 * The C library now contains the relocating allocator used in Emacs 19 for
7398 its editing buffers. This allocator (ralloc) minimizes allocation
7399 overhead and fragmentation by moving allocated regions around whenever it
7400 needs to. You always refer to a ralloc'd region with a "handle" (a
7401 pointer to a pointer--an object of type `void **').
7403 * There is a new `printf' format: `%m' gives you the string corresponding
7404 to the error code in `errno'.
7406 * In `scanf' formats, you can now use `%as' or `%a[' to do the normal `%s'
7407 or `%[' conversion, but instead of filling in a fixed-sized buffer you
7408 pass, the `a' modifier says to fill in a `char **' you pass with a
7411 * The `fnmatch' function supports the new flag bits `FNM_LEADING_DIR' and
7412 `FNM_CASEFOLD'. `FNM_LEADING_DIR' lets a pattern like `foo*' match a
7413 name like `foo/bar'. `FNM_CASEFOLD' says to ignore case in matching.
7415 * `mkstemp' is a traditional Unix function to atomically create and open a
7416 uniquely-named temporary file.
7420 * The standard location for the file that says what the local timezone is
7421 has changed again. It is now `/usr/local/etc/localtime' (or more
7422 precisely, `${prefix}/etc/localtime') rather than `/etc/localtime'.
7424 * The distribution no longer contains any files with names longer than 14
7427 * `struct ttyent' has two new flag bits: TTY_TRUSTED and TTY_CONSOLE.
7428 These are set by the new `trusted' and `console' keywords in `/etc/ttys'.
7430 * New functions `ttyslot' and `syslog' from 4.4 BSD.
7434 * The configuration process has changed quite a bit. The `configure'
7435 script is now used just like the configuration scripts for other GNU
7436 packages. The `sysdeps' directory hierarchy is much rearranged.
7437 The file `INSTALL' explains the new scheme in detail.
7439 * The header files no longer need to be processed into ANSI C and
7440 traditional C versions. There is just one set of files to install, and
7441 it will work with ANSI or old C compilers (including `gcc -traditional').
7443 * Brendan Kehoe and Ian Lance Taylor have ported the library to the
7444 MIPS DECStation running Ultrix 4.
7446 * The Sun 4 startup code (crt0) can now properly load SunOS 4 shared libraries.
7447 Tom Quinn contributed the initial code. The GNU C library can NOT yet be
7448 made itself into a shared library.
7450 * Yet further improved support for the i386, running 4.3 BSD-like systems
7451 (such as Mach 3 with the Unix single-server), or System V.
7453 * New function `strncasecmp' to do case-insensitive string comparison
7454 with limited length.
7456 * New function `strsep' is a reentrant alternative to `strtok'.
7458 * New functions `scandir' and `alphasort' for searching directories.
7460 * New function `setenv' is a better interface to `putenv'.
7462 * Ian Lance Taylor has contributed an implementation of the SVID `ftw'
7463 function for traversing a directory tree.
7465 * The GNU obstack package is now also part of the C library.
7466 The new function `open_obstack_stream' creates a stdio stream that
7467 writes onto an obstack; `obstack_printf' and `obstack_vprintf' do
7468 formatted output directly to an obstack.
7470 * Miscellaneous new functions: reboot, nice, sigaltstack (4.4 BSD only),
7471 cfmakeraw, getusershell, getpass, swab, getttyent, seteuid, setegid.
7473 * `FNM_FILE_NAME' is another name for `FNM_PATHNAME', used with `fnmatch'.
7475 * The new functions `strfry' and `memfrob' do mysterious and wonderful
7476 things to your strings.
7478 * There are some new test programs: test-fseek, testmb, and testrand.
7480 * Some work has been done to begin porting the library to 4.4 BSD and Linux.
7481 These ports are not finished, but are a good starting place for really
7482 supporting those systems.
7484 * `/etc/localtime' is now the standard location for the file that says what
7485 the local timezone is, rather than `/usr/local/lib/zoneinfo/localtime'.
7486 This follows the general principle that `/etc' is the place for all local
7487 configuration files.
7489 * The C library header files now use `extern "C"' when used by the C++
7490 compiler, so the C library should now work with C++ code.
7492 * The header file <bstring.h> is gone. <string.h> now declares bcopy,
7493 bcmp, bzero, and ffs. (Update: nowadays these functions are declared
7496 * Mike Haertel (of GNU e?grep and malloc fame) has written a new sorting
7497 function which uses the `merge sort' algorithm, and is said to be
7498 significantly faster than the old GNU `qsort' function. Merge sort is
7499 now the standard `qsort' function. The new algorithm can require a lot
7500 of temporary storage; so, the old sorting function is called when the
7501 required storage is not available.
7503 * The C library now includes Michael Glad's Ultra Fast Crypt, which
7504 provides the Unix `crypt' function, plus some other entry points.
7506 * The code and header files taken from 4.4 BSD have been updated with the
7507 latest files released from Berkeley.
7509 ----------------------------------------------------------------------
7512 Permission is granted to anyone to make or distribute verbatim copies
7513 of this document as received, in any medium, provided that the
7514 copyright notice and this permission notice are preserved,
7515 thus giving the recipient permission to redistribute in turn.
7517 Permission is granted to distribute modified versions
7518 of this document, or of portions of it,
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