1 GNU C Library NEWS -- history of user-visible changes.
2 Copyright (C) 1992-2021 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 * The dynamic linker accepts the --argv0 argument and provides opportunity
13 to change argv[0] string.
15 * The mallinfo2 function is added to report statistics as per mallinfo,
16 but with larger field widths to accurately report values that are
17 larger than fit in an integer.
19 * Add <sys/platform/x86.h> to provide query macros for x86 CPU features.
21 * Support for the RISC-V ISA running on Linux has been expanded to run on
22 32-bit hardware. This is supported for the following ISA and ABI pairs:
28 The 32-bit RISC-V port requires at least Linux 5.4, GCC 7.1 and binutils
31 * A new fortification level _FORTIFY_SOURCE=3 is available. At this level,
32 glibc may use additional checks that may have an additional performance
33 overhead. At present these checks are available only on LLVM 9 and later.
34 The latest GCC available at this time (10.2) does not support this level of
37 Deprecated and removed features, and other changes affecting compatibility:
39 * The mallinfo function is marked deprecated. Callers should call
42 * When dlopen is used in statically linked programs, alternative library
43 implementations from HWCAP subdirectories are no longer loaded.
44 Instead, the default implementation is used.
46 * The deprecated <sys/vtimes.h> header and the function vtimes have been
47 removed. To support old binaries, the vtimes function continues to exist
48 as a compatibility symbol. Applications should use the getrlimit or
51 * Following a change in the tzdata 2018a release upstream, the zdump
52 program is now installed in the /usr/bin subdirectory. Previously,
53 the /usr/sbin subdirectory was used.
55 * On s390(x), the type float_t is now derived from the macro
56 __FLT_EVAL_METHOD__ that is defined by the compiler, instead of being
57 hardcoded to double. This does not affect the ABI of any libraries
58 that are part of the GNU C Library, but may affect the ABI of other
59 libraries that use this type in their interfaces. The new definition
60 improves consistency with compiler behavior in many scenarios.
62 Changes to build and runtime requirements:
64 * On Linux, the system administrator needs to configure /dev/pts with
65 the intended access modes for pseudo-terminals. glibc no longer
66 attemps to adjust permissions of terminal devices. The previous glibc
67 defaults ("tty" group, user read/write and group write) already
68 corresponded to what most systems used, so that grantpt did not
69 perform any adjustments.
71 * On Linux, the posix_openpt and getpt functions no longer attempt to
72 use legacy (BSD) pseudo-terminals and assume that if /dev/ptmx exists
73 (and pseudo-terminals are supported), a devpts file system is mounted
74 on /dev/pts. Current systems already meet these requirements.
76 * s390x requires GCC 7.1 or newer. See gcc Bug 98269.
78 Security related changes:
80 CVE-2020-27618: An infinite loop has been fixed in the iconv program when
81 invoked with input containing redundant shift sequences in the IBM1364,
82 IBM1371, IBM1388, IBM1390, or IBM1399 character sets.
84 CVE-2020-29562: An assertion failure has been fixed in the iconv function
85 when invoked with UCS4 input containing an invalid character.
87 CVE-2019-25013: A buffer overflow has been fixed in the iconv function when
88 invoked with EUC-KR input containing invalid multibyte input sequences.
90 The following bugs are resolved with this release:
92 [The release manager will add the list generated by
93 scripts/list-fixed-bugs.py just before the release.]
100 * Unicode 13.0.0 Support: Character encoding, character type info, and
101 transliteration tables are all updated to Unicode 13.0.0, using
102 generator scripts contributed by Mike FABIAN (Red Hat).
104 * New locale added: ckb_IQ (Kurdish/Sorani spoken in Iraq)
106 * Support for Synopsys ARC HS cores (ARCv2 ISA) running Linux has been
107 added. This port requires at least binutils-2.32, gcc-8.3 and Linux-5.1.
108 Three ABIs are supported:
114 The arc* ABIs are little-endian while arceb is big-endian. All ABIs use
115 64-bit time (y2038 safe) and 64-bit file offsets (LFS default).
117 * The GNU C Library now loads audit modules listed in the DT_AUDIT and
118 DT_DEPAUDIT dynamic section entries of the main executable.
120 * powerpc64le supports IEEE128 long double libm/libc redirects when
121 using -mabi=ieeelongdouble to compile C code on supported GCC
122 toolchains. It is recommended to use GCC 8 or newer when testing
125 * To help detect buffer overflows and other out-of-bounds accesses
126 several APIs have been annotated with GCC 'access' attribute. This
127 should help GCC 10 issue better warnings.
129 * On Linux, functions pthread_attr_setsigmask_np and
130 pthread_attr_getsigmask_np have been added. They allow applications
131 to specify the signal mask of a thread created with pthread_create.
133 * The GNU C Library now provides the header file <sys/single_threaded.h>
134 which declares the variable __libc_single_threaded. Applications are
135 encouraged to use this variable for single-thread optimizations,
136 instead of weak references to symbols historically defined in
139 * The functions sigabbrev_np and sigdescr_np have been added. The
140 sigabbrev_np function returns the abbreviated signal name (e.g. "HUP" for
141 SIGHUP) while sigdescr_np returns a string describing the signal number
142 (e.g "Hangup" for SIGHUP). Different than strsignal, sigdescr_np does not
143 attempt to translate the return description, both functions return
144 NULL for an invalid signal number.
146 They should be used instead of sys_siglist or sys_sigabbrev and they
147 are both thread and async-signal safe. These functions are GNU extensions.
149 * The functions strerrorname_np and strerrordesc_np have been added. The
150 strerroname_np function returns error number name (e.g. "EINVAL" for EINVAL)
151 while strerrordesc_np returns a string describing the error number
152 (e.g "Invalid argument" for EINVAL). Different than strerror,
153 strerrordesc_np does not attempt to translate the return description, both
154 functions return NULL for an invalid error number.
156 They should be used instead of sys_errlist and sys_nerr, both are
157 thread and async-signal safe. These functions are GNU extensions.
159 * AArch64 now supports standard branch protection security hardening
160 in glibc when it is built with a GCC that is configured with
161 --enable-standard-branch-protection (or if -mbranch-protection=standard
162 flag is passed when building both GCC target libraries and glibc,
163 in either case a custom GCC is needed). This includes branch target
164 identification (BTI) and pointer authentication for return addresses
165 (PAC-RET). They require armv8.5-a and armv8.3-a architecture
166 extensions respectively for the protection to be effective,
167 otherwise the used instructions are nops. User code can use PAC-RET
168 without libc support, but BTI requires a libc that is built with BTI
169 support, otherwise runtime objects linked into user code will not be
172 Deprecated and removed features, and other changes affecting compatibility:
174 * Remove configure option --enable-obsolete-rpc. Sun RPC is removed
175 from glibc. This includes the rpcgen program, librpcsvc, and the Sun
176 RPC header files. Backward compatibility for old programs is kept
177 only for architectures and ABIs that have been added in or before
178 glibc 2.31. New programs need to use TI-RPC
179 <http://git.linux-nfs.org/?p=steved/libtirpc.git;a=summary> and
180 rpcsvc-proto <https://github.com/thkukuk/rpcsvc-proto>.
182 * Remove configure option --enable-obsolete-nsl. libnsl is only built
183 as shared library for backward compatibility and the NSS modules "nis"
184 and "nisplus" are not built at all and libnsl's headers aren't
185 installed. This compatibility is kept only for architectures and ABIs
186 that have been added in or before version 2.28. Replacement
187 implementations based on TI-RPC, which additionally support IPv6, are
188 available from <https://github.com/thkukuk/>. This change does not
189 affect the "compat" NSS module, which does not depend on libnsl
190 since 2.27 and thus can be used without NIS.
192 * The deprecated <sys/sysctl.h> header and the sysctl function have been
193 removed. To support old binaries, the sysctl function continues to
194 exist as a compatibility symbol (on those architectures which had it),
195 but always fails with ENOSYS. This reflects the removal of the system
196 call from all architectures, starting with Linux 5.5.
198 * The sstk function is no longer available to newly linked binaries.
199 Its implementation always returned with a failure, and the function
200 was not declared in any header file.
202 * The legacy signal handling functions siginterrupt, sigpause, sighold,
203 sigrelse, sigignore and sigset, and the sigmask macro have been
204 deprecated. Applications should use the sigsuspend, sigprocmask and
205 sigaction functions instead.
207 * ldconfig now defaults to the new format for ld.so.cache. glibc has
208 already supported this format for almost 20 years.
210 * The deprecated arrays sys_siglist, _sys_siglist, and sys_sigabbrev
211 are no longer available to newly linked binaries, and their declarations
212 have been removed from <string.h>. They are exported solely as
213 compatibility symbols to support old binaries. All programs should use
216 * The deprecated symbols sys_errlist, _sys_errlist, sys_nerr, and _sys_nerr
217 are no longer available to newly linked binaries, and their declarations
218 have been removed from <stdio.h>. They are exported solely as
219 compatibility symbols to support old binaries. All programs should use
220 strerror or strerror_r instead.
222 * Both strerror and strerror_l now share the same internal buffer in the
223 calling thread, meaning that the returned string pointer may be invalided
224 or contents might be overwritten on subsequent calls in the same thread or
225 if the thread is terminated. It makes strerror MT-safe.
227 * Using weak references to libpthread functions such as pthread_create
228 or pthread_key_create to detect the singled-threaded nature of a
229 program is an obsolescent feature. Future versions of glibc will
230 define pthread_create within libc.so.6 itself, so such checks will
231 always flag the program as multi-threaded. Applications should check
232 the __libc_single_threaded variable declared in
233 <sys/single_threaded.h> instead.
235 * The "files" NSS module no longer supports the "key" database (used for
236 secure RPC). The contents of the /etc/publickey file will be ignored,
237 regardless of the settings in /etc/nsswitch.conf. (This method of
238 storing RPC keys only supported the obsolete and insecure AUTH_DES
239 flavor of secure RPC.)
241 * The __morecore and __after_morecore_hook malloc hooks and the default
242 implementation __default_morecore have been deprecated. Applications
243 should use malloc interposition to change malloc behavior, and mmap to
244 allocate anonymous memory. A future version of glibc may require that
245 applications which use the malloc hooks must preload a special shared
246 object, to enable the hooks.
248 * The hesiod NSS module has been deprecated and will be removed in a
249 future version of glibc. System administrators are encouraged to
250 switch to other approaches for networked account databases, such as
253 Changes to build and runtime requirements:
255 * powerpc64le requires GCC 7.4 or newer. This is required for supporting
256 long double redirects.
258 Security related changes:
260 CVE-2016-10228: An infinite loop has been fixed in the iconv program when
261 invoked with the -c option and when processing invalid multi-byte input
262 sequences. Reported by Jan Engelhardt.
264 CVE-2020-10029: Trigonometric functions on x86 targets suffered from stack
265 corruption when they were passed a pseudo-zero argument. Reported by Guido
266 Vranken / ForAllSecure Mayhem.
268 CVE-2020-1752: A use-after-free vulnerability in the glob function when
269 expanding ~user has been fixed.
271 CVE-2020-6096: A signed comparison vulnerability in the ARMv7 memcpy and
272 memmove functions has been fixed. Discovered by Jason Royes and Samual
273 Dytrych of the Cisco Security Assessment and Penetration Team (See
276 The following bugs are resolved with this release:
278 [9809] localedata: ckb_IQ: new Kurdish Sorani locale
279 [10441] manual: Backtraces code example lacks error checking
280 [10815] librt: [timer_create / SIGEV_THREAD] signalmask of
281 timer_sigev_thread dangerous
282 [14231] stdio: stdio-common tests memory requirements
283 [14578] libc: /proc-based emulation for lchmod, fchmodat
284 [16272] dynamic-link: dlopen()ing a DT_FILTER library crashes if
285 filtee has constructor
286 [19519] locale: iconv(1) with -c option hangs on illegal multi-byte
287 sequences (CVE-2016-10228)
288 [19737] admin: Doc page “20.5.2 Infinity and NaN” has incorrect HTML
289 character entities for infinity & pi
290 [20338] libc: Parsing of /etc/gshadow can return bad pointers causing
291 segfaults in applications
292 [20543] libc: Please move from .gnu.linkonce to comdat
293 [22489] network: gcc warns about implicit convertion in
294 ICMP6_FILTER_SETPASS with -Wsign-conversion
295 [22525] localedata: or_IN LC_COLLATE does not use copy "iso14651_t1"
296 [23294] math: Complex _FloatN functions are redirected to the wrong
297 function with -mlong-double-64
298 [23296] libc: Data race in setting function descriptor during lazy
300 [23668] dynamic-link: ldconfig: Default to the new format for
302 [23819] hurd: hurd: Add C11 thread support
303 [23990] build: test-container error out on failure to exec child.
304 [23991] build: shell-container typo in run_command_array
305 [24638] manual: Error in example of parsing a template string
306 [24654] manual: Wrong declaration of wcschr in libc manual
307 [24943] dynamic-link: Support DT_AUDIT, DT_DEPAUDIT in the dynamic
309 [25051] dynamic-link: aarch64, powerpc64 uses surplus static tls for
310 dynamically loaded dsos
311 [25098] nptl: nptl: ctype classification functions are not AS-Safe
312 [25219] libc: improve out-of-bounds checking with GCC 10 attribute
314 [25262] libc: getcontext/setcontext/swapcontext unnecessarily save and
315 restore EAX, ECX and EDX
316 [25397] dynamic-link: Legacy bitmap doesn't cover jitted code
317 [25414] glob: 'glob' use-after-free bug (CVE-2020-1752)
318 [25420] network: Race condition in resolv_conf.c can result in caching
319 stale configuration forever
320 [25487] math: sinl() stack corruption from crafted input
322 [25506] build: configure: broken detection of STT_GNU_IFUNC when GCC
324 [25523] libc: MIPS/Linux inline syscall template is miscompiled
325 [25620] libc: Signed comparison vulnerability in the ARMv7 memcpy()
327 [25623] libc: test-sysvmsg, test-sysvsem, test-sysvshm fail with 2.31
328 on 32 bit and old kernel
329 [25635] libc: arm: Wrong sysdep order selection for soft-fp
330 [25639] localedata: Some names of days and months wrongly spelt in
332 [25657] libc: sigprocmask() and sigisemptyset() manipulate different
333 amount of sigset_t bytes
334 [25691] stdio: printf: memory leak when printing long multibyte
336 [25715] libc: system() returns wrong errors when posix_spawn fails
337 [25733] malloc: mallopt(M_MXFAST) can set global_max_fast to 0
338 [25734] locale: mbrtowc with Big5-HKSCS fails to reset conversion
339 state for conversions that produce two Unicode code points
340 [25765] nptl: Incorrect futex syscall in __pthread_disable_asynccancel
341 for linux x86_64 leads to livelock
342 [25788] dynamic-link: [i386] -fno-omit-frame-pointer in CFLAGS causes
343 test failures, invalid instruction in ld.so
344 [25790] glob: Typo in tst-fnmatch.input
345 [25810] libc: x32: Incorrect syscall entries with pointer, off_t and
347 [25819] localedata: Update locale data to Unicode 13.0.0
348 [25824] libc: Abnormal function of strnlen in aarch64
349 [25887] dynamic-link: Wasted space in _dl_x86_feature_1[1]
350 [25896] libc: Incorrect prctl
351 [25902] libc: Bad LOADARGS_N
352 [25905] dynamic-link: VSX registers are corrupted during PLT
353 resolution when glibc is built with --disable-multi-arch and --with-
355 [25933] string: Off by one error in __strncmp_avx2 when
356 length=VEC_SIZE*4 and strings are at page boundaries can cause a
358 [25942] nptl: Deadlock on stack_cache_lock between __nptl_setxid and
359 exiting detached thread
360 [25966] libc: Incorrect access of __x86_shared_non_temporal_threshold
362 [25976] nss: internal_end*ent in nss_compat may clobber errno, hiding
364 [25999] nptl: Use-after-free issue in pthread_getaddr_default_np
365 [26073] math: getpayload() has wrong return value
366 [26076] dynamic-link: dlmopen crashes after failing to load
367 dependencies in audit mode
368 [26120] localedata: column width of of some Korean
369 JUNGSEONG/JONGSEONG characters wrong (should be 0)
370 [26128] libc: Incorrect bit_cpu_CLFLUSHOPT
371 [26133] libc: Incorrect need_arch_feature_F16C
372 [26137] libc: strtod() triggers exception FE_INEXACT on reasonable
374 [26149] libc: PKU is usable only if OSPKE is set
375 [26173] libc: powerpc64*: Add @notoc to calls to functions that do not
377 [26208] libc: Incorrect bit_cpu_CLFSH
378 [26210] network: Incorrect use of hidden symbols for global sunrpc
380 [26211] stdio: printf integer overflow calculating allocation size
381 [26214] stdio: printf_fp double free
382 [26215] stdio: printf_fp memory leak
383 [26232] time: FAIL: support/tst-timespec for 32-bit targets
384 [26258] nss: nss_compat should not read input files with mmap
385 [26332] string: Incorrect cache line size load causes memory
393 * The GNU C Library now supports a feature test macro _ISOC2X_SOURCE to
394 enable features from the draft ISO C2X standard. Only some features from
395 this draft standard are supported by the GNU C Library, and as the draft
396 is under active development, the set of features enabled by this macro is
397 liable to change. Features from C2X are also enabled by _GNU_SOURCE, or
398 by compiling with "gcc -std=gnu2x".
400 * The <math.h> functions that round their results to a narrower type now
401 have corresponding type-generic macros in <tgmath.h>, as defined in TS
402 18661-1:2014 and TS 18661-3:2015 as amended by the resolution of
403 Clarification Request 13 to TS 18661-3.
405 * The function pthread_clockjoin_np has been added, enabling join with a
406 terminated thread with a specific clock. It allows waiting against
407 CLOCK_MONOTONIC and CLOCK_REALTIME. This function is a GNU extension.
409 * New locale added: mnw_MM (Mon language spoken in Myanmar).
411 * The DNS stub resolver will optionally send the AD (authenticated data) bit
412 in queries if the trust-ad option is set via the options directive in
413 /etc/resolv.conf (or if RES_TRUSTAD is set in _res.options). In this
414 mode, the AD bit, as provided by the name server, is available to
415 applications which call res_search and related functions. In the default
416 mode, the AD bit is not set in queries, and it is automatically cleared in
417 responses, indicating a lack of DNSSEC validation. (Therefore, the name
418 servers and the network path to them are treated as untrusted.)
420 Deprecated and removed features, and other changes affecting compatibility:
422 * The totalorder and totalordermag functions, and the corresponding
423 functions for other floating-point types, now take pointer arguments to
424 avoid signaling NaNs possibly being converted to quiet NaNs in argument
425 passing. This is in accordance with the resolution of Clarification
426 Request 25 to TS 18661-1, as applied for C2X. Existing binaries that pass
427 floating-point arguments directly will continue to work.
429 * The obsolete function stime is no longer available to newly linked
430 binaries, and its declaration has been removed from <time.h>.
431 Programs that set the system time should use clock_settime instead.
433 * We plan to remove the obsolete function ftime, and the header <sys/timeb.h>,
434 in a future version of glibc. In this release, the header still exists
435 but calling ftime will cause a compiler warning. All programs should use
436 gettimeofday or clock_gettime instead.
438 * The gettimeofday function no longer reports information about a
439 system-wide time zone. This 4.2-BSD-era feature has been deprecated for
440 many years, as it cannot handle the full complexity of the world's
441 timezones, but hitherto we have supported it on a best-effort basis.
442 Changes required to support 64-bit time_t on 32-bit architectures have
443 made this no longer practical.
445 As of this release, callers of gettimeofday with a non-null 'tzp' argument
446 should expect to receive a 'struct timezone' whose tz_minuteswest and
447 tz_dsttime fields are zero. (For efficiency reasons, this does not always
448 happen on a few Linux-based ports. This will be corrected in a future
451 All callers should supply a null pointer for the 'tzp' argument to
452 gettimeofday. For accurate information about the time zone associated
453 with the current time, use the localtime function.
455 gettimeofday itself is obsolescent according to POSIX. We have no plans
456 to remove access to this function, but portable programs should consider
457 using clock_gettime instead.
459 * The settimeofday function can still be used to set a system-wide time
460 zone when the operating system supports it. This is because the Linux
461 kernel reused the API, on some architectures, to describe a system-wide
462 time-zone-like offset between the software clock maintained by the kernel,
463 and the "RTC" clock that keeps time when the system is shut down.
465 However, to reduce the odds of this offset being set by accident,
466 settimeofday can no longer be used to set the time and the offset
467 simultaneously. If both of its two arguments are non-null, the call
468 will fail (setting errno to EINVAL).
470 Callers attempting to set this offset should also be prepared for the call
471 to fail and set errno to ENOSYS; this already happens on the Hurd and on
472 some Linux architectures. The Linux kernel maintainers are discussing a
473 more principled replacement for the reused API. After a replacement
474 becomes available, we will change settimeofday to fail with ENOSYS on all
475 platforms when its 'tzp' argument is not a null pointer.
477 settimeofday itself is obsolescent according to POSIX. Programs that set
478 the system time should use clock_settime and/or the adjtime family of
479 functions instead. We may cease to make settimeofday available to newly
480 linked binaries after there is a replacement for Linux's time-zone-like
483 * SPARC ISA v7 is no longer supported. v8 is still supported, but only if
484 the optional CAS instruction is implemented (for instance, LEON processors
485 are still supported, but SuperSPARC processors are not).
487 As the oldest 64-bit SPARC ISA is v9, this only affects 32-bit
490 * If a lazy binding failure happens during dlopen, during the execution of
491 an ELF constructor, the process is now terminated. Previously, the
492 dynamic loader would return NULL from dlopen, with the lazy binding error
493 captured in a dlerror message. In general, this is unsafe because
494 resetting the stack in an arbitrary function call is not possible.
496 * For MIPS hard-float ABIs, the GNU C Library will be configured to need an
497 executable stack unless explicitly configured at build time to require
498 minimum kernel version 4.8 or newer. This is because executing
499 floating-point branches on a non-executable stack on Linux kernels prior to
500 4.8 can lead to application crashes for some MIPS configurations. While
501 currently PT_GNU_STACK is not widely used on MIPS, future releases of GCC are
502 expected to enable non-executable stack by default with PT_GNU_STACK by
503 default and is thus likely to trigger a crash on older kernels.
505 The GNU C Library can be built with --enable-kernel=4.8.0 in order to keep a
506 non-executable stack while dropping support for older kernels.
508 * System call wrappers for time system calls now use the new time64 system
509 calls when available. On 32-bit targets, these wrappers attempt to call
510 the new system calls first and fall back to the older 32-bit time system
511 calls if they are not present. This may cause issues in environments
512 that cannot handle unsupported system calls gracefully by returning
513 -ENOSYS. Seccomp sandboxes are affected by this issue.
515 Changes to build and runtime requirements:
517 * It is no longer necessary to have recent Linux kernel headers to build
518 working (non-stub) system call wrappers on all architectures except 64-bit
519 RISC-V. 64-bit RISC-V requires a minimum kernel headers version of 5.0.
521 * The ChangeLog file is no longer present in the toplevel directory of the
522 source tree. ChangeLog files are located in the ChangeLog.old directory as
523 ChangeLog.N where the highest N has the latest entries.
525 Security related changes:
527 CVE-2020-1751: A defect in the PowerPC backtrace function could cause an
528 out-of-bounds write when executed in a signal frame context.
530 CVE-2019-19126: ld.so failed to ignore the LD_PREFER_MAP_32BIT_EXEC
531 environment variable during program execution after a security
532 transition, allowing local attackers to restrict the possible mapping
533 addresses for loaded libraries and thus bypass ASLR for a setuid
534 program. Reported by Marcin Kościelnicki.
536 The following bugs are resolved with this release:
538 [12031] localedata: iconv -t ascii//translit with Greek characters
539 [15813] libc: Multiple issues in __gen_tempname
540 [17726] libc: [arm, sparc] profil_counter should be compat symbol
541 [18231] libc: ipc_perm struct's mode member has wrong type in sys/ipc.h
542 [19767] libc: vdso is not used with static linking
543 [19903] hurd: Shared mappings not being inherited by children processes
544 [20358] network: RES_USE_DNSSEC sets DO; should also have a way to set AD
545 [20839] dynamic-link: Incomplete rollback of dynamic linker state on
547 [23132] localedata: Missing transliterations in Miscellaneous Mathematical
548 Symbols-A/B Unicode blocks
549 [23518] libc: Eliminate __libc_utmp_jump_table
550 [24026] malloc: malloc_info() returns wrong numbers
551 [24054] localedata: Many locales are missing date_fmt
552 [24214] dynamic-link: user defined ifunc resolvers may run in ldd mode
553 [24304] dynamic-link: Lazy binding failure during ELF
554 constructors/destructors is not fatal
555 [24376] libc: RISC-V symbol size confusion with _start
556 [24682] localedata: zh_CN first weekday should be Monday per GB/T
558 [24824] libc: test-in-container does not install charmap files compatible
560 [24844] regex: regex bad pointer / leakage if malloc fails
561 [24867] malloc: Unintended malloc_info formatting changes
562 [24879] libc: login: utmp alarm timer can arrive after lock acquisition
563 [24880] libc: login: utmp implementation uses struct flock with fcntl64
564 [24882] libc: login: pututline uses potentially outdated cache
565 [24899] libc: Missing nonstring attributes in <utmp.h>, <utmpx.h>
566 [24902] libc: login: Repeating pututxline on EINTR/EAGAIN causes stale
568 [24916] dynamic-link: [MIPS] Highest EI_ABIVERSION value not raised to
570 [24930] dynamic-link: dlopen of PIE executable can result in
571 _dl_allocate_tls_init assertion failure
572 [24950] localedata: Top-of-tree glibc does not build with top-of-tree GCC
573 (stringop-overflow error)
574 [24959] time: librt IFUNC resolvers for clock_gettime and clock_*
575 functions other can lead to crashes
576 [24967] libc: jemalloc static linking causes runtime failure
577 [24986] libc: alpha: new getegid, geteuid and getppid syscalls used
579 [25035] libc: sbrk() failure handled poorly in tunables_strdup
580 [25087] dynamic-link: ldconfig mishandles unusual .dynstr placement
581 [25097] libc: new -Warray-bounds with GCC 10
582 [25112] dynamic-link: dlopen must not make new objects accessible when it
583 still can fail with an error
584 [25139] localedata: Please add the new mnw_MM locale
585 [25149] regex: Array bounds violation in proceed_next_node
586 [25157] dynamic-link: Audit cookie for the dynamic loader is not
587 initialized correctly
588 [25189] libc: glibc's __glibc_has_include causes issues with clang
590 [25194] malloc: malloc.c: do_set_mxfast incorrectly casts the mallopt
592 [25204] dynamic-link: LD_PREFER_MAP_32BIT_EXEC not ignored in setuid
593 binaries (CVE-2019-19126)
594 [25225] libc: ld.so fails to link on x86 if GCC defaults to -fcf-
596 [25226] string: strstr: Invalid result if needle crosses page on s390-z15
598 [25232] string: <string.h> does not enable const correctness for strchr et
600 [25233] localedata: Consider "." as the thousands separator for sl_SI
602 [25241] nptl: __SIZEOF_PTHREAD_MUTEX_T defined twice for x86
603 [25251] build: Failure to run tests when CFLAGS contains -DNDEBUG.
604 [25271] libc: undeclared identifier PTHREAD_MUTEX_DEFAULT when compiling
606 [25323] localedata: km_KH: d_t_fmt contains "m" instead of "%M"
607 [25324] localedata: lv_LV: d_t_fmt contains suspicious words in the time
609 [25396] dynamic-link: Failing dlopen can leave behind dangling GL
610 (dl_initfirst) link map pointer
611 [25401] malloc: pvalloc must not have __attribute_alloc_size__
612 [25423] libc: Array overflow in backtrace on powerpc
613 [25425] network: Missing call to __resolv_context_put in
614 getaddrinfo.c:gethosts
621 * Unicode 12.1.0 Support: Character encoding, character type info, and
622 transliteration tables are all updated to Unicode 12.1.0, using
623 generator scripts contributed by Mike FABIAN (Red Hat).
625 * The dynamic linker accepts the --preload argument to preload shared
626 objects, in addition to the LD_PRELOAD environment variable.
628 * The twalk_r function has been added. It is similar to the existing
629 twalk function, but it passes an additional caller-supplied argument
630 to the callback function.
632 * On Linux, the getdents64, gettid, and tgkill functions have been added.
634 * Minguo (Republic of China) calendar support has been added as an
635 alternative calendar for the following locales: zh_TW, cmn_TW, hak_TW,
638 * The entry for the new Japanese era has been added for ja_JP locale.
640 * Memory allocation functions malloc, calloc, realloc, reallocarray, valloc,
641 pvalloc, memalign, and posix_memalign fail now with total object size
642 larger than PTRDIFF_MAX. This is to avoid potential undefined behavior with
643 pointer subtraction within the allocated object, where results might
644 overflow the ptrdiff_t type.
646 * The dynamic linker no longer refuses to load objects which reference
647 versioned symbols whose implementation has moved to a different soname
648 since the object has been linked. The old error message, symbol
649 FUNCTION-NAME, version SYMBOL-VERSION not defined in file DSO-NAME with
650 link time reference, is gone.
652 * Add new POSIX-proposed pthread_cond_clockwait, pthread_mutex_clocklock,
653 pthread_rwlock_clockrdlock, pthread_rwlock_clockwrlock and sem_clockwait
654 functions. These behave similarly to their "timed" equivalents, but also
655 accept a clockid_t parameter to determine which clock their timeout should
656 be measured against. All functions allow waiting against CLOCK_MONOTONIC
657 and CLOCK_REALTIME. The decision of which clock to be used is made at the
658 time of the wait (unlike with pthread_condattr_setclock, which requires
659 the clock choice at initialization time).
661 * On AArch64 the GNU IFUNC resolver call ABI changed: old resolvers still
662 work, new resolvers can use a second argument which can be extended in
663 the future, currently it contains the AT_HWCAP2 value.
665 Deprecated and removed features, and other changes affecting compatibility:
667 * The copy_file_range function fails with ENOSYS if the kernel does not
668 support the system call of the same name. Previously, user space
669 emulation was performed, but its behavior did not match the kernel
670 behavior, which was deemed too confusing. Applications which use the
671 copy_file_range function can no longer rely on glibc to provide a fallback
672 on kernels that do not support the copy_file_range system call, and if
673 this function returns ENOSYS, they will need to use their own fallback.
674 Support for copy_file_range for most architectures was added in version
675 4.5 of the mainline Linux kernel.
677 * The functions clock_gettime, clock_getres, clock_settime,
678 clock_getcpuclockid, clock_nanosleep were removed from the librt library
679 for new applications (on architectures which had them). Instead, the
680 definitions in libc will be used automatically, which have been available
683 * The obsolete and never-implemented XSI STREAMS header files <stropts.h>
684 and <sys/stropts.h> have been removed.
686 * Support for the "inet6" option in /etc/resolv.conf and the RES_USE_INET6
687 resolver flag (deprecated in glibc 2.25) have been removed.
689 * The obsolete RES_INSECURE1 and RES_INSECURE2 option flags for the DNS stub
690 resolver have been removed from <resolv.h>.
692 * With --enable-bind-now, installed programs are now linked with the
695 * Support for the PowerPC SPE ISA extension (powerpc-*-*gnuspe*
696 configurations) has been removed, following the deprecation of this
697 subarchitecture in version 8 of GCC, and its removal in version 9.
699 * On 32-bit Arm, support for the port-based I/O emulation and the <sys/io.h>
700 header have been removed.
702 * The Linux-specific <sys/sysctl.h> header and the sysctl function have been
703 deprecated and will be removed from a future version of glibc.
704 Application should directly access /proc instead. For obtaining random
705 bits, the getentropy function can be used.
707 Changes to build and runtime requirements:
709 * GCC 6.2 or later is required to build the GNU C Library.
711 Older GCC versions and non-GNU compilers are still supported when
712 compiling programs that use the GNU C Library.
714 Security related changes:
716 CVE-2019-7309: x86-64 memcmp used signed Jcc instructions to check
717 size. For x86-64, memcmp on an object size larger than SSIZE_MAX
718 has undefined behavior. On x32, the size_t argument may be passed
719 in the lower 32 bits of the 64-bit RDX register with non-zero upper
720 32 bits. When it happened with the sign bit of RDX register set,
721 memcmp gave the wrong result since it treated the size argument as
722 zero. Reported by H.J. Lu.
724 CVE-2019-9169: Attempted case-insensitive regular-expression match
725 via proceed_next_node in posix/regexec.c leads to heap-based buffer
726 over-read. Reported by Hongxu Chen.
728 The following bugs are resolved with this release:
730 [2872] locale: Transliteration Cyrillic -> ASCII fails
731 [6399] libc: gettid() should have a wrapper
732 [16573] malloc: mtrace hangs when MALLOC_TRACE is defined
733 [16976] glob: fnmatch unbounded stack VLA for collating symbols
734 [17396] localedata: globbing for locale by [[.collating-element.]]
735 [18035] dynamic-link: pldd does no longer work, enters infinite loop
736 [18465] malloc: memusagestat is built using system C library
737 [18830] locale: iconv -c -f ascii with >buffer size worth of input before
738 invalid input drops valid char
739 [20188] nptl: libpthread IFUNC resolver for vfork can lead to crash
740 [20568] locale: Segfault with wide characters and setlocale/fgetwc/UTF-8
741 [21897] localedata: Afar locales: Fix mon, abmon, and abday
742 [22964] localedata: The Japanese Era name will be changed on May 1, 2019
743 [23352] malloc: __malloc_check_init still defined in public header
745 [23403] nptl: Wrong alignment of TLS variables
746 [23501] libc: nftw() doesn't return dangling symlink's inode
747 [23733] malloc: Check the count before calling tcache_get()
748 [23741] malloc: Missing __attribute_alloc_size__ in many allocation
750 [23831] localedata: nl_NL missing LC_NUMERIC thousands_sep
751 [23844] nptl: pthread_rwlock_trywrlock results in hang
752 [23983] argparse: Missing compat versions of argp_failure and argp_error
753 for long double = double
754 [23984] libc: Missing compat versions of err.h and error.h functions for
756 [23996] localedata: Dutch salutations
757 [24040] libc: riscv64: unterminated call chain in __thread_start
758 [24047] network: libresolv should use IP_RECVERR/IPV6_RECVERR to avoid
760 [24051] stdio: puts and putchar output to _IO_stdout instead of stdout
761 [24059] nss: nss_files: get_next_alias calls fgets_unlocked without
763 [24114] regex: regexec buffer read overrun in "grep -i
764 '\(\(\)*.\)*\(\)\(\)\1'"
765 [24122] libc: Segfaults if 0 returned from la_version
766 [24153] stdio: Some input functions do not react to stdin assignment
767 [24155] string: x32 memcmp can treat positive length as 0 (if sign bit in
768 RDX is set) (CVE-2019-7309)
769 [24161] nptl: __run_fork_handlers self-deadlocks in malloc/tst-mallocfork2
770 [24164] libc: Systemtap probes need to use "nr" constraint on 32-bit Arm,
771 not the default "nor"
772 [24166] dynamic-link: Dl_serinfo.dls_serpath[1] in dlfcn.h causes UBSAN
773 false positives, change to modern flexible array
774 [24180] nptl: pthread_mutex_trylock does not use the correct order of
775 instructions while maintaining the robust mutex list due to missing
777 [24194] librt: Non-compatibility symbols for clock_gettime etc. cause
778 unnecessary librt dependencies
779 [24200] localedata: Revert first_weekday removal in en_IE locale
780 [24211] nptl: Use-after-free in Systemtap probe in pthread_join
781 [24215] nptl: pthread_timedjoin_np should be a cancellation point
782 [24216] malloc: Check for large bin list corruption when inserting
784 [24228] stdio: old x86 applications that use legacy libio crash on exit
785 [24231] dynamic-link: [sparc64] R_SPARC_H34 implementation falls through
787 [24293] localedata: Missing Minguo calendar support for TW locales
788 [24296] localedata: Orthographic mistakes in 'day' and 'abday' sections in
790 [24307] localedata: Update locale data to Unicode 12.0.0
791 [24323] dynamic-link: dlopen should not be able open PIE objects
792 [24335] build: "Obsolete types detected" with Linux 5.0 headers
793 [24369] localedata: Orthographic mistakes in 'mon' and 'abmon' sections in
795 [24370] localedata: Add lang_name for tt_RU locale
796 [24372] locale: Binary locale files are not architecture independent
797 [24394] time: strptime %Ey mis-parses final year of era
798 [24476] dynamic-link: __libc_freeres triggers bad free in libdl if dlerror
800 [24506] dynamic-link: FAIL: elf/tst-pldd with --enable-hardcoded-path-in-
802 [24531] malloc: Malloc tunables give tcache assertion failures
803 [24532] libc: conform/arpa/inet.h failures due to linux kernel 64-bit
805 [24535] localedata: Update locale data to Unicode 12.1.0
806 [24537] build: nptl/tst-eintr1 test case can hit task limits on some
807 kernels and break testing
808 [24544] build: elf/tst-pldd doesn't work if you install with a --prefix
809 [24556] build: [GCC 9] error: ‘%s’ directive argument is null
810 [-Werror=format-overflow=]
811 [24570] libc: alpha: compat msgctl uses __IPC_64
812 [24584] locale: Data race in __wcsmbs_clone_conv
813 [24588] stdio: Remove codecvt vtables from libio
814 [24603] math: sysdeps/ieee754/dbl-64/branred.c is slow when compiled with
816 [24614] localedata: nl_NL LC_MONETARY doesn't match CLDR 35
817 [24632] stdio: Old binaries which use freopen with default stdio handles
819 [24640] libc: __ppc_get_timebase_freq() always return 0 when using static
821 [24652] localedata: szl_PL spelling correction
822 [24695] nss: nss_db: calling getpwent after endpwent crashes
823 [24696] nss: endgrent() clobbers errno=ERRNO for 'group: db files' entry
824 in /etc/nsswitch.conf
825 [24699] libc: mmap64 with very large offset broken on MIPS64 n32
826 [24740] libc: getdents64 type confusion
827 [24741] dynamic-link: ld.so should not require that a versioned symbol is
828 always implemented in the same library
829 [24744] libc: Remove copy_file_range emulation
830 [24757] malloc: memusagestat is linked against system libpthread
831 [24794] libc: Partial test suite run builds corrupt test-in-container
839 * The getcpu wrapper function has been added, which returns the currently
840 used CPU and NUMA node. This function is Linux-specific.
842 * A new convenience target has been added for distribution maintainers
843 to build and install all locales as directories with files. The new
844 target is run by issuing the following command in your build tree:
845 'make localedata/install-locale-files', with an optional DESTDIR
846 to set the install root if you wish to install into a non-default
849 * Optimized generic exp, exp2, log, log2, pow, sinf, cosf, sincosf and tanf.
851 * The reallocarray function is now declared under _DEFAULT_SOURCE, not just
852 for _GNU_SOURCE, to match BSD environments.
854 * For powercp64le ABI, Transactional Lock Elision is now enabled iff kernel
855 indicates that it will abort the transaction prior to entering the kernel
856 (PPC_FEATURE2_HTM_NOSC on hwcap2). On older kernels the transaction is
857 suspended, and this caused some undefined side-effects issues by aborting
858 transactions manually. Glibc avoided it by abort transactions manually on
859 each syscall, but it lead to performance issues on newer kernels where the
860 HTM state is saved and restore lazily (the state being saved even when the
861 process actually does not use HTM).
863 * The functions posix_spawn_file_actions_addchdir_np and
864 posix_spawn_file_actions_addfchdir_np have been added, enabling
865 posix_spawn and posix_spawnp to run the new process in a different
866 directory. These functions are GNU extensions. The function
867 posix_spawn_file_actions_addchdir_np is similar to the Solaris function
870 * The popen and system do not run atfork handlers anymore (BZ#17490).
871 Although it is a possible POSIX violation, the POSIX rationale in
872 pthread_atfork documentation regarding atfork handlers is to handle
873 inconsistent mutex state after a fork call in a multi-threaded process.
874 In both popen and system there is no direct access to user-defined mutexes.
876 * Support for the C-SKY ABIV2 running on Linux has been added. This port
877 requires at least binutils-2.32, gcc-9.0, and linux-4.20. Two ABIs are
879 - C-SKY ABIV2 soft-float little-endian
880 - C-SKY ABIV2 hard-float little-endian
882 * strftime's default formatting of a locale's alternative year (%Ey)
883 has been changed to zero-pad the year to a minimum of two digits,
884 like "%y". This improves the display of Japanese era years during
885 the first nine years of a new era, and is expected to be harmless
886 for all other locales (only Japanese locales regularly have
887 alternative year numbers less than 10). Zero-padding can be
888 overridden with the '_' or '-' flags (which are GNU extensions).
890 * As a GNU extension, the '_' and '-' flags can now be applied to
891 "%EY" to control how the year number is formatted; they have the
892 same effect that they would on "%Ey".
894 Deprecated and removed features, and other changes affecting compatibility:
896 * The glibc.tune tunable namespace has been renamed to glibc.cpu and the
897 tunable glibc.tune.cpu has been renamed to glibc.cpu.name.
899 * The type of the pr_uid and pr_gid members of struct elf_prpsinfo, defined
900 in <sys/procfs.h>, has been corrected to match the type actually used by
901 the Linux kernel. This affects the size and layout of that structure on
902 MicroBlaze, MIPS (n64 ABI only), Nios II and RISC-V.
904 * For the MIPS n32 ABI, the type of the pr_sigpend and pr_sighold members of
905 struct elf_prstatus, and the pr_flag member of struct elf_prpsinfo,
906 defined in <sys/procfs.h>, has been corrected to match the type actually
907 used by the Linux kernel. This affects the size and layout of those
910 * An archaic GNU extension to scanf, under which '%as', '%aS', and '%a[...]'
911 meant to scan a string and allocate space for it with malloc, is now
912 restricted to programs compiled in C89 or C++98 mode with _GNU_SOURCE
913 defined. This extension conflicts with C99's use of '%a' to scan a
914 hexadecimal floating-point number, which is now available to programs
915 compiled as C99 or C++11 or higher, regardless of _GNU_SOURCE.
917 POSIX.1-2008 includes the feature of allocating a buffer for string input
918 with malloc, using the modifier letter 'm' instead. Programs using
919 '%as', '%aS', or '%a[...]' with the old GNU meaning should change to
920 '%ms', '%mS', or '%m[...]' respectively. Programs that wish to use the
921 C99 '%a' no longer need to avoid _GNU_SOURCE.
923 GCC's -Wformat warnings can detect most uses of this extension, as long
924 as all functions that call vscanf, vfscanf, or vsscanf are annotated with
925 __attribute__ ((format (scanf, ...))).
927 Changes to build and runtime requirements:
929 * Python 3.4 or later is required to build the GNU C Library.
931 * On most architectures, GCC 5 or later is required to build the GNU C
932 Library. (On powerpc64le, GCC 6.2 or later is still required, as before.)
934 Older GCC versions and non-GNU compilers are still supported when
935 compiling programs that use the GNU C Library.
937 Security related changes:
939 CVE-2018-19591: A file descriptor leak in if_nametoindex can lead to a
940 denial of service due to resource exhaustion when processing getaddrinfo
941 calls with crafted host names. Reported by Guido Vranken.
943 CVE-2019-6488: On x32, the size_t parameter may be passed in the lower
944 32 bits of a 64-bit register with with non-zero upper 32 bit. When it
945 happened, accessing the 32-bit size_t value as the full 64-bit register
946 in the assembly string/memory functions would cause a buffer overflow.
949 CVE-2016-10739: The getaddrinfo function could successfully parse IPv4
950 addresses with arbitrary trailing characters, potentially leading to data
951 or command injection issues in applications.
953 The following bugs are resolved with this release:
955 [10425] localedata: it_IT/it_CH: LC_TIME format is wrong
956 [10496] localedata: 12h time representation in multiple locales faulty
957 [10797] localedata: it_IT locale numeric does not have a separator for
959 [11319] libc: dprintf doesn't handle errors properly
960 [16346] time: mktime: potentially unsafe use of localtime_offset
961 [17248] build: glibc should not sort CFLAGS (support gcc plugins and
963 [17405] libc: Implement posix_spawn_file_actions_addchdir_np,
964 posix_spawn_file_actions_addfchdir_np
965 [17426] localedata: Indian locales: set the correct date format
966 [17490] stdio: popen should not invoke atfork handlers
967 [17783] libc: TIOCSER_TEMT conditions inconsistent
968 [18040] regex: use-after-free in regexec/get_subexp
969 [18093] libc: Corrupted aux-cache causes ldconfig to segfault
970 [20018] network: getaddrinfo should reject IP addresses with trailing
971 characters (CVE-2016-10739)
972 [20209] localedata: Spelling mistake for Sunday in Greenlandic kl_GL
973 [20271] libc: Missing "\n" in __libc_fatal calls
974 [20480] dynamic-link: Patch: ifunc not executable, crashes sudo qemu
975 [20544] libc: RFE: atexit, __cxa_atexit, on_exit should assert function
976 pointer argument is non-NULL
977 [21037] stdio: open_memstream and freopen
978 [21286] libc: bits/siginfo.h is missing enum definition for TRAP_HWBKPT
979 [21716] time: Crash in glibc's mktime in low-memory situations
980 [22834] stdio: Subprocess forked by popen may crash in Linux when
981 multithreads call popen
982 [22927] network: crash in vn_gai_enqueue_request if requests_tail was NULL
983 and pthread_create fails.
984 [23032] hurd: sysdeps/htl/pt-barrier-init.c:39: bad call to memcmp ?
985 [23125] libc: riscv64: endless loop when throwing an exception from a
987 [23275] nptl: Race in pthread_mutex_lock while promoting to
988 PTHREAD_MUTEX_ELISION_NP.
989 [23400] libc: stdlib/test-bz22786.c creates temporary files in glibc
991 [23479] math: [mips] bits/fenv.h should not define some macros for soft-
993 [23490] libc: sysdeps/unix/sysv/linux/x86/tst-cet-property-2.c:49: off by
995 [23497] libc: readdir64@GLIBC_2.1 cannot parse the kernel directory stream
996 [23509] dynamic-link: CET enabled glibc is incompatible with the older
998 [23520] nscd: nscd: Use-after-free in addgetnetgrentX and its callers
999 [23521] nss: get_next_alias nss_files file stream leak
1000 [23538] nptl: Hang in pthread_cond_broadcast
1001 [23562] libc: Wrong type for si_band in Linux-specific siginfo_t
1002 [23578] regex: Invalid memory access if regex pattern contains NUL byte
1003 [23579] libc: Errors misreported in preadv2
1004 [23597] build: support/test-container.c doesn't work with different
1006 [23603] time: mktime signed integer overflow on large timestamps
1007 [23606] libc: Missing ENDBR32 in sysdeps/i386/start.S
1008 [23614] libc: powerpc: missing CFI register information in __mpn_*
1010 [23637] string: Generic strstr/strcasestr fails with huge needles
1011 [23640] libc: no way to easily clear FD_CLOEXEC in
1012 posix_spawn_file_actions_adddup2()
1013 [23649] libc: [microblaze/mips/nios2/riscv] sys/procfs.h pr_uid, pr_gid
1015 [23656] libc: [mips n32] sys/procfs.h pr_sigpend, pr_sighold, pr_flag have
1017 [23679] libc: gethostid: Missing NULL check for gethostbyname_r result
1018 [23689] libc: Bug in documentation for rusage.ru_ixrss in
1019 bits/types/struct_rusage.h
1020 [23690] dynamic-link: Segfault in _dl_profile_fixup with a high number of
1022 [23707] dynamic-link: Missing unwind info in sysdeps/powerpc/powerpc32/dl-
1024 [23709] string: glibc 2.25 lacks sse2 optimized strstr()
1025 [23716] dynamic-link: _dl_runtime_resolve_shstk isn't selected properly
1026 [23717] libc: glibc: stdlib/tst-setcontext9 test suite failure on
1028 [23724] localedata: Albanian date formats are incorrect
1029 [23735] math: libnldbl_nonshared.a references internal libm symbols
1030 [23740] localedata: kl_GL: Month names and date formats need update
1031 [23744] regex: regex refactorings to remove BE, avoid duplication
1032 [23745] time: mktime fix for Gnulib + coreutils
1033 [23758] time: Improve the width of alternate representation for year in
1035 [23783] libc: [mips] Missing CMSPAR bits/termios.h
1036 [23789] time: mktime does not set errno on failure
1037 [23791] localedata: Wrong monetary format for ca_ES locale
1038 [23793] locale: c32rtomb and mbrtoc32 should not alias wcrtomb and mbrtowc
1039 [23794] locale: c16rtomb does not handle surrogate pairs
1040 [23821] libc: si_band in siginfo_t has wrong type long int on sparc64
1041 [23822] math: ia64 static libm.a is missing exp2f, log2f and powf symbols
1042 [23836] time: time/tst-mktime2 test failure on Arm (32-bit)
1043 [23848] libc: [sparc] Some socket syscalls wrongly assumed to be present
1044 [23861] nptl: rdlock stalls indefinitely on an unlocked pthread rwlock
1045 [23862] libc: [sh] missing kernel-features.h undefines
1046 [23864] libc: [riscv] missing kernel-features.h undefines
1047 [23867] libc: [arm/microblaze] __ASSUME_MLOCK2 incorrect
1048 [23907] malloc: Incorrect double-free malloc tcache check disregards
1050 [23913] libc: off-by-one in function maybe_script_execute in
1051 sysdeps/posix/spawni.c
1052 [23915] libc: [arm] __ASSUME_COPY_FILE_RANGE incorrect
1053 [23923] locale: Add --no-hard-links option to localedef
1054 [23927] network: Linux if_nametoindex() does not close descriptor
1056 [23961] math: powf can overflow to inf without setting errno in non-
1057 nearest rounding mode
1058 [23967] libc: [2.28 Regression]: New sigaction implementation breaks m68k
1059 [23972] libc: __old_getdents64 uses wrong d_off value on overflow
1060 [23993] libc: glibc 2.29 doesn't build with gcc 4.9
1061 [23995] localedata: Remove execution flags from localedata/locales/bi_VU
1062 [24011] localedata: Fixed small type in comment for locale bs_BA
1063 [24018] libc: gettext() may return NULL
1064 [24022] build: riscv build failure with Linux kernel 4.20-rc7
1065 [24023] build: [2.29 Regression] FAIL: elf/check-localplt
1066 [24024] string: strerror() might set errno to ENOMEM due to -fno-math-
1068 [24027] malloc: glibc: realloc() ncopies 32-bit integer overflow
1069 [24034] libc: tst-cancel21-static fails with SIGBUS on pre-ARMv7 when
1071 [24046] localedata: en_US locale doesn't define date_fmt
1072 [24063] manual: @var{errno} should be @code{errno}
1073 [24066] soft-fp: Inconsistent _FP_W_TYPE_SIZE check
1074 [24088] libc: VSCR field is not being correctly read in ucontext_t on
1076 [24096] time: Specifying '_' or '-' flag for "%EY" does not produce the
1078 [24097] string: Can't use 64-bit register for size_t in assembly codes for
1080 [24110] hurd: SS_DISABLE never set in stack_t value returned by
1082 [24112] network: Do not send DNS queries for non-host names (where all
1083 answers will be rejected)
1084 [24130] libc: alpha __remqu corrupts $f3 register
1091 * The localization data for ISO 14651 is updated to match the 2016
1092 Edition 4 release of the standard, this matches data provided by
1093 Unicode 9.0.0. This update introduces significant improvements to the
1094 collation of Unicode characters. This release deviates slightly from
1095 the standard in that the collation element ordering for lowercase and
1096 uppercase LATIN script characters is adjusted to ensure that regular
1097 expressions with ranges like [a-z] and [A-Z] don't interleave e.g. A
1098 is not matched by [a-z]. With the update many locales have been
1099 updated to take advantage of the new collation information. The new
1100 collation information has increased the size of the compiled locale
1101 archive or binary locales.
1103 * The GNU C Library can now be compiled with support for Intel CET, AKA
1104 Intel Control-flow Enforcement Technology. When the library is built
1105 with --enable-cet, the resulting glibc is protected with indirect
1106 branch tracking (IBT) and shadow stack (SHSTK). CET-enabled glibc is
1107 compatible with all existing executables and shared libraries. This
1108 feature is currently supported on i386, x86_64 and x32 with GCC 8 and
1109 binutils 2.29 or later. Note that CET-enabled glibc requires CPUs
1110 capable of multi-byte NOPs, like x86-64 processors as well as Intel
1111 Pentium Pro or newer. NOTE: --enable-cet has been tested for i686,
1112 x86_64 and x32 on non-CET processors. --enable-cet has been tested
1113 for x86_64 and x32 on CET SDVs, but Intel CET support hasn't been
1116 * The GNU C Library now has correct support for ABSOLUTE symbols
1117 (SHN_ABS-relative symbols). Previously such ABSOLUTE symbols were
1118 relocated incorrectly or in some cases discarded. The GNU linker can
1119 make use of the newer semantics, but it must communicate it to the
1120 dynamic loader by setting the ELF file's identification (EI_ABIVERSION
1121 field) to indicate such support is required.
1123 * Unicode 11.0.0 Support: Character encoding, character type info, and
1124 transliteration tables are all updated to Unicode 11.0.0, using
1125 generator scripts contributed by Mike FABIAN (Red Hat).
1127 * <math.h> functions that round their results to a narrower type are added
1128 from TS 18661-1:2014 and TS 18661-3:2015:
1130 - fadd, faddl, daddl and corresponding fMaddfN, fMaddfNx, fMxaddfN and
1131 fMxaddfNx functions.
1133 - fsub, fsubl, dsubl and corresponding fMsubfN, fMsubfNx, fMxsubfN and
1134 fMxsubfNx functions.
1136 - fmul, fmull, dmull and corresponding fMmulfN, fMmulfNx, fMxmulfN and
1137 fMxmulfNx functions.
1139 - fdiv, fdivl, ddivl and corresponding fMdivfN, fMdivfNx, fMxdivfN and
1140 fMxdivfNx functions.
1142 * Two grammatical forms of month names are now supported for the following
1143 languages: Armenian, Asturian, Catalan, Czech, Kashubian, Occitan, Ossetian,
1144 Scottish Gaelic, Upper Sorbian, and Walloon. The following languages now
1145 support two grammatical forms in abbreviated month names: Catalan, Greek,
1148 * Newly added locales: Lower Sorbian (dsb_DE) and Yakut (sah_RU) also
1149 include the support for two grammatical forms of month names.
1151 * Building and running on GNU/Hurd systems now works without out-of-tree
1154 * The renameat2 function has been added, a variant of the renameat function
1155 which has a flags argument. If the flags are zero, the renameat2 function
1156 acts like renameat. If the flag is not zero and there is no kernel
1157 support for renameat2, the function will fail with an errno value of
1158 EINVAL. This is different from the existing gnulib function renameatu,
1159 which performs a plain rename operation in case of a RENAME_NOREPLACE
1160 flags and a non-existing destination (and therefore has a race condition
1161 that can clobber the destination inadvertently).
1163 * The statx function has been added, a variant of the fstatat64
1164 function with an additional flags argument. If there is no direct
1165 kernel support for statx, glibc provides basic stat support based on
1166 the fstatat64 function.
1168 * IDN domain names in getaddrinfo and getnameinfo now use the system libidn2
1169 library if installed. libidn2 version 2.0.5 or later is recommended. If
1170 libidn2 is not available, internationalized domain names are not encoded
1171 or decoded even if the AI_IDN or NI_IDN flags are passed to getaddrinfo or
1172 getnameinfo. (getaddrinfo calls with non-ASCII names and AI_IDN will fail
1173 with an encoding error.) Flags which used to change the IDN encoding and
1174 decoding behavior (AI_IDN_ALLOW_UNASSIGNED, AI_IDN_USE_STD3_ASCII_RULES,
1175 NI_IDN_ALLOW_UNASSIGNED, NI_IDN_USE_STD3_ASCII_RULES) have been
1176 deprecated. They no longer have any effect.
1178 * Parsing of dynamic string tokens in DT_RPATH, DT_RUNPATH, DT_NEEDED,
1179 DT_AUXILIARY, and DT_FILTER has been expanded to support the full
1180 range of ELF gABI expressions including such constructs as
1181 '$ORIGIN$ORIGIN' (if valid). For SUID/GUID applications the rules
1182 have been further restricted, and where in the past a dynamic string
1183 token sequence may have been interpreted as a literal string it will
1184 now cause a load failure. These load failures were always considered
1185 unspecified behaviour from the perspective of the dynamic loader, and
1186 for safety are now load errors e.g. /foo/${ORIGIN}.so in DT_NEEDED
1187 results in a load failure now.
1189 * Support for ISO C threads (ISO/IEC 9899:2011) has been added. The
1190 implementation includes all the standard functions provided by
1193 - thrd_current, thrd_equal, thrd_sleep, thrd_yield, thrd_create,
1194 thrd_detach, thrd_exit, and thrd_join for thread management.
1196 - mtx_init, mtx_lock, mtx_timedlock, mtx_trylock, mtx_unlock, and
1197 mtx_destroy for mutual exclusion.
1199 - call_once for function call synchronization.
1201 - cnd_broadcast, cnd_destroy, cnd_init, cnd_signal, cnd_timedwait, and
1202 cnd_wait for conditional variables.
1204 - tss_create, tss_delete, tss_get, and tss_set for thread-local storage.
1206 Application developers must link against libpthread to use ISO C threads.
1208 Deprecated and removed features, and other changes affecting compatibility:
1210 * The nonstandard header files <libio.h> and <_G_config.h> are no longer
1211 installed. Software that was using either header should be updated to
1212 use standard <stdio.h> interfaces instead.
1214 * The stdio functions 'getc' and 'putc' are no longer defined as macros.
1215 This was never required by the C standard, and the macros just expanded
1216 to call alternative names for the same functions. If you hoped getc and
1217 putc would provide performance improvements over fgetc and fputc, instead
1218 investigate using (f)getc_unlocked and (f)putc_unlocked, and, if
1219 necessary, flockfile and funlockfile.
1221 * All stdio functions now treat end-of-file as a sticky condition. If you
1222 read from a file until EOF, and then the file is enlarged by another
1223 process, you must call clearerr or another function with the same effect
1224 (e.g. fseek, rewind) before you can read the additional data. This
1225 corrects a longstanding C99 conformance bug. It is most likely to affect
1226 programs that use stdio to read interactive input from a terminal.
1229 * The macros 'major', 'minor', and 'makedev' are now only available from
1230 the header <sys/sysmacros.h>; not from <sys/types.h> or various other
1231 headers that happen to include <sys/types.h>. These macros are rarely
1232 used, not part of POSIX nor XSI, and their names frequently collide with
1233 user code; see https://sourceware.org/bugzilla/show_bug.cgi?id=19239 for
1234 further explanation.
1236 <sys/sysmacros.h> is a GNU extension. Portable programs that require
1237 these macros should first include <sys/types.h>, and then include
1238 <sys/sysmacros.h> if __GNU_LIBRARY__ is defined.
1240 * The tilegx*-*-linux-gnu configurations are no longer supported.
1242 * The obsolete function ustat is no longer available to newly linked
1243 binaries; the headers <ustat.h> and <sys/ustat.h> have been removed. This
1244 function has been deprecated in favor of fstatfs and statfs.
1246 * The obsolete function nfsservctl is no longer available to newly linked
1247 binaries. This function was specific to systems using the Linux kernel
1248 and could not usefully be used with the GNU C Library on systems with
1249 version 3.1 or later of the Linux kernel.
1251 * The obsolete function name llseek is no longer available to newly linked
1252 binaries. This function was specific to systems using the Linux kernel
1253 and was not declared in a header. Programs should use the lseek64 name
1254 for this function instead.
1256 * The AI_IDN_ALLOW_UNASSIGNED and NI_IDN_ALLOW_UNASSIGNED flags for the
1257 getaddrinfo and getnameinfo functions have been deprecated. The behavior
1258 previously selected by them is now always enabled.
1260 * The AI_IDN_USE_STD3_ASCII_RULES and NI_IDN_USE_STD3_ASCII_RULES flags for
1261 the getaddrinfo and getnameinfo functions have been deprecated. The STD3
1262 restriction (rejecting '_' in host names, among other things) has been
1263 removed, for increased compatibility with non-IDN name resolution.
1265 * The fcntl function now have a Long File Support variant named fcntl64. It
1266 is added to fix some Linux Open File Description (OFD) locks usage on non
1267 LFS mode. As for others *64 functions, fcntl64 semantics are analogous with
1268 fcntl and LFS support is handled transparently. Also for Linux, the OFD
1269 locks act as a cancellation entrypoint.
1271 * The obsolete functions encrypt, encrypt_r, setkey, setkey_r, cbc_crypt,
1272 ecb_crypt, and des_setparity are no longer available to newly linked
1273 binaries, and the headers <rpc/des_crypt.h> and <rpc/rpc_des.h> are no
1274 longer installed. These functions encrypted and decrypted data with the
1275 DES block cipher, which is no longer considered secure. Software that
1276 still uses these functions should switch to a modern cryptography library,
1279 * Reflecting the removal of the encrypt and setkey functions above, the
1280 macro _XOPEN_CRYPT is no longer defined. As a consequence, the crypt
1281 function is no longer declared unless _DEFAULT_SOURCE or _GNU_SOURCE is
1284 * The obsolete function fcrypt is no longer available to newly linked
1285 binaries. It was just another name for the standard function crypt,
1286 and it has not appeared in any header file in many years.
1288 * We have tentative plans to hand off maintenance of the passphrase-hashing
1289 library, libcrypt, to a separate development project that will, we hope,
1290 keep up better with new passphrase-hashing algorithms. We will continue
1291 to declare 'crypt' in <unistd.h>, and programs that use 'crypt' or
1292 'crypt_r' should not need to change at all; however, distributions will
1293 need to install <crypt.h> and libcrypt from a separate project.
1295 In this release, if the configure option --disable-crypt is used, glibc
1296 will not install <crypt.h> or libcrypt, making room for the separate
1297 project's versions of these files. The plan is to make this the default
1298 behavior in a future release.
1300 Changes to build and runtime requirements:
1302 GNU make 4.0 or later is now required to build glibc.
1304 Security related changes:
1306 CVE-2016-6261, CVE-2016-6263, CVE-2017-14062: Various vulnerabilities have
1307 been fixed by removing the glibc-internal IDNA implementation and using
1308 the system-provided libidn2 library instead. Originally reported by Hanno
1309 Böck and Christian Weisgerber.
1311 CVE-2017-18269: An SSE2-based memmove implementation for the i386
1312 architecture could corrupt memory. Reported by Max Horn.
1314 CVE-2018-11236: Very long pathname arguments to realpath function could
1315 result in an integer overflow and buffer overflow. Reported by Alexey
1318 CVE-2018-11237: The mempcpy implementation for the Intel Xeon Phi
1319 architecture could write beyond the target buffer, resulting in a buffer
1320 overflow. Reported by Andreas Schwab.
1322 The following bugs are resolved with this release:
1324 [1190] stdio: fgetc()/fread() behaviour is not POSIX compliant
1325 [6889] manual: 'PWD' mentioned but not specified
1326 [13575] libc: SSIZE_MAX defined as LONG_MAX is inconsistent with ssize_t,
1327 when __WORDSIZE != 64
1328 [13762] regex: re_search etc. should return -2 on memory exhaustion
1329 [13888] build: /tmp usage during testing
1330 [13932] math: dbl-64 pow unexpectedly slow for some inputs
1331 [14092] nptl: Support C11 threads
1332 [14095] localedata: Review / update collation data from Unicode / ISO
1334 [14508] libc: -Wformat warnings
1335 [14553] libc: Namespace pollution loff_t in sys/types.h
1336 [14890] libc: Make NT_PRFPREG canonical.
1337 [15105] libc: Extra PLT references with -Os
1338 [15512] libc: __bswap_constant_16 not compiled when -Werror -Wsign-
1340 [16335] manual: Feature test macro documentation incomplete and out of
1342 [16552] libc: Unify umount implementations in terms of umount2
1343 [17082] libc: htons et al.: statement-expressions prevent use on global
1344 scope with -O1 and higher
1345 [17343] libc: Signed integer overflow in /stdlib/random_r.c
1346 [17438] localedata: pt_BR: wrong d_fmt delimiter
1347 [17662] libc: please implement binding for the new renameat2 syscall
1348 [17721] libc: __restrict defined as /* Ignore */ even in c11
1349 [17979] libc: inconsistency between uchar.h and stdint.h
1350 [18018] dynamic-link: Additional $ORIGIN handling issues (CVE-2011-0536)
1351 [18023] libc: extend_alloca is broken (questionable pointer comparison,
1352 horrible machine code)
1353 [18124] libc: hppa: setcontext erroneously returns -1 as exit code for
1355 [18471] libc: llseek should be a compat symbol
1356 [18473] soft-fp: [powerpc-nofpu] __sqrtsf2, __sqrtdf2 should be compat
1358 [18991] nss: nss_files skips large entry in database
1359 [19239] libc: Including stdlib.h ends up with macros major and minor being
1361 [19463] libc: linknamespace failures when compiled with -Os
1362 [19485] localedata: csb_PL: Update month translations + add yesstr/nostr
1363 [19527] locale: Normalized charset name not recognized by setlocale
1364 [19667] string: Missing Sanity Check for malloc calls in file 'testcopy.c'
1365 [19668] libc: Missing Sanity Check for malloc() in file 'tst-setcontext-
1367 [19728] network: out of bounds stack read in libidn function
1368 idna_to_ascii_4i (CVE-2016-6261)
1369 [19729] network: out of bounds heap read on invalid utf-8 inputs in
1370 stringprep_utf8_nfkc_normalize (CVE-2016-6263)
1371 [19818] dynamic-link: Absolute (SHN_ABS) symbols incorrectly relocated by
1373 [20079] libc: Add SHT_X86_64_UNWIND to elf.h
1374 [20251] libc: 32bit programs pass garbage in struct flock for OFD locks
1375 [20419] dynamic-link: files with large allocated notes crash in
1377 [20530] libc: bswap_16 should use __builtin_bswap16() when available
1378 [20890] dynamic-link: ldconfig: fsync the files before atomic rename
1379 [20980] manual: CFLAGS environment variable replaces vital options
1380 [21163] regex: Assertion failure in pop_fail_stack when executing a
1381 malformed regexp (CVE-2015-8985)
1382 [21234] manual: use of CFLAGS makes glibc detect no optimization
1383 [21269] dynamic-link: i386 sigaction sa_restorer handling is wrong
1384 [21313] build: Compile Error GCC 5.4.0 MIPS with -0S
1385 [21314] build: Compile Error GCC 5.2.0 MIPS with -0s
1386 [21508] locale: intl/tst-gettext failure with latest msgfmt
1387 [21547] localedata: Tibetan script collation broken (Dzongkha and Tibetan)
1388 [21812] network: getifaddrs() returns entries with ifa_name == NULL
1389 [21895] libc: ppc64 setjmp/longjmp not fully interoperable with static
1391 [21942] dynamic-link: _dl_dst_substitute incorrectly handles $ORIGIN: with
1393 [22241] localedata: New locale: Yakut (Sakha) locale for Russia (sah_RU)
1394 [22247] network: Integer overflow in the decode_digit function in
1395 puny_decode.c in libidn (CVE-2017-14062)
1396 [22342] nscd: NSCD not properly caching netgroup
1397 [22391] nptl: Signal function clear NPTL internal symbols inconsistently
1398 [22550] localedata: es_ES locale (and other es_* locales): collation
1399 should treat ñ as a primary different character, sync the collation
1400 for Spanish with CLDR
1401 [22638] dynamic-link: sparc: static binaries are broken if glibc is built
1402 by gcc configured with --enable-default-pie
1403 [22639] time: year 2039 bug for localtime etc. on 64-bit platforms
1404 [22644] string: memmove-sse2-unaligned on 32bit x86 produces garbage when
1405 crossing 2GB threshold (CVE-2017-18269)
1406 [22646] localedata: redundant data (LC_TIME) for es_CL, es_CU, es_EC and
1408 [22735] time: Misleading typo in time.h source comment regarding
1410 [22753] libc: preadv2/pwritev2 fallback code should handle offset=-1
1411 [22761] libc: No trailing `%n' conversion specifier in FMT passed from
1412 `__assert_perror_fail ()' to `__assert_fail_base ()'
1413 [22766] libc: all glibc internal dlopen should use RTLD_NOW for robust
1415 [22786] libc: Stack buffer overflow in realpath() if input size is close
1416 to SSIZE_MAX (CVE-2018-11236)
1417 [22787] dynamic-link: _dl_check_caller returns false when libc is linked
1418 through an absolute DT_NEEDED path
1419 [22792] build: tcb-offsets.h dependency dropped
1420 [22797] libc: pkey_get() uses non-reserved name of argument
1421 [22807] libc: PTRACE_* constants missing for powerpc
1422 [22818] glob: posix/tst-glob_lstat_compat failure on alpha
1423 [22827] dynamic-link: RISC-V ELF64 parser mis-reads flag in ldconfig
1424 [22830] malloc: malloc_stats doesn't restore cancellation state on stderr
1425 [22848] localedata: ca_ES: update date definitions from CLDR
1426 [22862] build: _DEFAULT_SOURCE is defined even when _ISOC11_SOURCE is
1427 [22884] math: RISCV fmax/fmin handle signalling NANs incorrectly
1428 [22896] localedata: Update locale data for an_ES
1429 [22902] math: float128 test failures with GCC 8
1430 [22918] libc: multiple common of `__nss_shadow_database'
1431 [22919] libc: sparc32: backtrace yields infinite backtrace with
1433 [22926] libc: FTBFS on powerpcspe
1434 [22932] localedata: lt_LT: Update of abbreviated month names from CLDR
1436 [22937] localedata: Greek (el_GR, el_CY) locales actually need ab_alt_mon
1437 [22947] libc: FAIL: misc/tst-preadvwritev2
1438 [22963] localedata: cs_CZ: Add alternative month names
1439 [22987] math: [powerpc/sparc] fdim inlines errno, exceptions handling
1440 [22996] localedata: change LC_PAPER to en_US in es_BO locale
1441 [22998] dynamic-link: execstack tests are disabled when SELinux is
1443 [23005] network: Crash in __res_context_send after memory allocation
1445 [23007] math: strtod cannot handle -nan
1446 [23024] nss: getlogin_r is performing NSS lookups when loginid isn't set
1447 [23036] regex: regex equivalence class regression
1448 [23037] libc: initialize msg_flags to zero for sendmmsg() calls
1449 [23069] libc: sigaction broken on riscv64-linux-gnu
1450 [23094] localedata: hr_HR: wrong thousands_sep and mon_thousands_sep
1451 [23102] dynamic-link: Incorrect parsing of multiple consecutive $variable
1452 patterns in runpath entries (e.g. $ORIGIN$ORIGIN)
1453 [23137] nptl: s390: pthread_join sometimes block indefinitely (on 31bit
1454 and libc build with -Os)
1455 [23140] localedata: More languages need two forms of month names
1456 [23145] libc: _init/_fini aren't marked as hidden
1457 [23152] localedata: gd_GB: Fix typo in "May" (abbreviated)
1458 [23171] math: C++ iseqsig for long double converts arguments to double
1459 [23178] nscd: sudo will fail when it is run in concurrent with commands
1460 that changes /etc/passwd
1461 [23196] string: __mempcpy_avx512_no_vzeroupper mishandles large copies
1463 [23206] dynamic-link: static-pie + dlopen breaks debugger interaction
1464 [23208] localedata: New locale - Lower Sorbian (dsb)
1465 [23233] regex: Memory leak in build_charclass_op function in file
1467 [23236] stdio: Harden function pointers in _IO_str_fields
1468 [23250] nptl: Offset of __private_ss differs from GCC
1469 [23253] math: tgamma test suite failures on i686 with -march=x86-64
1470 -mtune=generic -mfpmath=sse
1471 [23259] dynamic-link: Unsubstituted ${ORIGIN} remains in DT_NEEDED for
1473 [23264] libc: posix_spawnp wrongly executes ENOEXEC in non compat mode
1474 [23266] nis: stringop-truncation warning with new gcc8.1 in nisplus-
1476 [23272] math: fma(INFINITY,INFIITY,0.0) should be INFINITY
1477 [23277] math: nan function should not have const attribute
1478 [23279] math: scanf and strtod wrong for some hex floating-point
1479 [23280] math: wscanf rounds wrong; wcstod is ok for negative numbers and
1481 [23290] localedata: IBM273 is not equivalent to ISO-8859-1
1482 [23303] build: undefined reference to symbol
1483 '__parse_hwcap_and_convert_at_platform@@GLIBC_2.23'
1484 [23307] dynamic-link: Absolute symbols whose value is zero ignored in
1486 [23313] stdio: libio vtables validation and standard file object
1488 [23329] libc: The __libc_freeres infrastructure is not properly run across
1490 [23349] libc: Various glibc headers no longer compatible with
1492 [23351] malloc: Remove unused code related to heap dumps and malloc
1494 [23363] stdio: stdio-common/tst-printf.c has non-free license
1495 [23396] regex: Regex equivalence regression in single-byte locales
1496 [23422] localedata: oc_FR: More updates of locale data
1497 [23442] build: New warning with GCC 8
1498 [23448] libc: Out of bounds access in IBM-1390 converter
1499 [23456] libc: Wrong index_cpu_LZCNT
1500 [23458] build: tst-get-cpu-features-static isn't added to tests
1501 [23459] libc: COMMON_CPUID_INDEX_80000001 isn't populated for Intel
1503 [23467] dynamic-link: x86/CET: A property note parser bug
1510 * The GNU C Library can now be compiled with support for building static
1511 PIE executables (See --enable-static-pie in INSTALL). These static PIE
1512 executables are like static executables but can be loaded at any address
1513 and provide additional security hardening benefits at the cost of some
1514 memory and performance. When the library is built with --enable-static-pie
1515 the resulting libc.a is usable with GCC 8 and above to create static PIE
1516 executables using the GCC option '-static-pie'. This feature is currently
1517 supported on i386, x86_64 and x32 with binutils 2.29 or later, and on
1518 aarch64 with binutils 2.30 or later.
1520 * Optimized x86-64 asin, atan2, exp, expf, log, pow, atan, sin, cosf,
1521 sinf, sincosf and tan with FMA, contributed by Arjan van de Ven and
1524 * Optimized x86-64 trunc and truncf for processors with SSE4.1.
1526 * Optimized generic expf, exp2f, logf, log2f, powf, sinf, cosf and sincosf.
1528 * In order to support faster and safer process termination the malloc API
1529 family of functions will no longer print a failure address and stack
1530 backtrace after detecting heap corruption. The goal is to minimize the
1531 amount of work done after corruption is detected and to avoid potential
1532 security issues in continued process execution. Reducing shutdown time
1533 leads to lower overall process restart latency, so there is benefit both
1534 from a security and performance perspective.
1536 * The abort function terminates the process immediately, without flushing
1537 stdio streams. Previous glibc versions used to flush streams, resulting
1538 in deadlocks and further data corruption. This change also affects
1539 process aborts as the result of assertion failures.
1541 * On platforms where long double has the IEEE binary128 format (aarch64,
1542 alpha, mips64, riscv, s390 and sparc), the math library now implements
1543 _Float128 interfaces for that type, as defined by ISO/IEC TS 18661-3:2015.
1544 These are the same interfaces added in version 2.26 for some platforms where
1545 this format is supported but is not the format of long double.
1547 * On platforms with support for _Float64x (aarch64, alpha, i386, ia64,
1548 mips64, powerpc64le, riscv, s390, sparc and x86_64), the math library now
1549 implements interfaces for that type, as defined by ISO/IEC TS
1550 18661-3:2015. These are corresponding interfaces to those supported for
1553 * The math library now implements interfaces for the _Float32, _Float64 and
1554 _Float32x types, as defined by ISO/IEC TS 18661-3:2015. These are
1555 corresponding interfaces to those supported for _Float128.
1557 * glibc now implements the memfd_create and mlock2 functions on Linux.
1559 * Support for memory protection keys was added. The <sys/mman.h> header now
1560 declares the functions pkey_alloc, pkey_free, pkey_mprotect, pkey_set,
1563 * The copy_file_range function was added.
1565 * Optimized memcpy, mempcpy, memmove, and memset for sparc M7.
1567 * The ldconfig utility now processes `include' directives using the C/POSIX
1568 collation ordering. Previous glibc versions used locale-specific
1569 ordering, the change might break systems that relied on that.
1571 * Support for two grammatical forms of month names has been added.
1572 In a call to strftime, the "%B" and "%b" format specifiers will now
1573 produce the grammatical form required when the month is used as part
1574 of a complete date. New "%OB" and "%Ob" specifiers produce the form
1575 required when the month is named by itself. For instance, in Greek
1576 and in many Slavic and Baltic languages, "%B" will produce the month
1577 in genitive case, and "%OB" will produce the month in nominative case.
1579 In a call to strptime, "%B", "%b", "%h", "%OB", "%Ob", and "%Oh"
1580 are all valid and will all accept any known form of month
1581 name---standalone or complete, abbreviated or full. In a call to
1582 nl_langinfo, the query constants MON_1..12 and ABMON_1..12 return
1583 the strings used by "%B" and "%b", respectively. New query
1584 constants ALTMON_1..12 and _NL_ABALTMON_1..12 return the strings
1585 used by "%OB" and "%Ob", respectively.
1587 In a locale definition file, use "alt_mon" and "ab_alt_mon" to
1588 define the strings for %OB and %Ob, respectively; these have the
1589 same syntax as "mon" and "abmon". These arrays are optional; if they
1590 are not provided then they have the same content as "mon" and "abmon",
1593 These features are provided for locales which define "alt_mon" and/or
1594 "ab_alt_mon" in their locale source data. This release includes such
1595 alternative month name data for the following languages: Belarusian,
1596 Croatian, Greek, Lithuanian, Polish, Russian, and Ukrainian.
1598 This feature is currently a GNU extension, but it is expected to
1599 be added to the next revision of POSIX, and it is also already
1600 available on some BSD-derived operating systems.
1602 This feature will cause existing statically compiled applications
1603 to fail to load locales and fall back to the builtin C/POSIX locales.
1604 See notes below for other changes affecting compatibility.
1606 * Support for the RISC-V ISA running on Linux has been added. This port
1607 requires at least binutils-2.30, gcc-7.3.0, and linux-4.15; and is supported
1608 for the following ISA and ABI pairs:
1614 Deprecated and removed features, and other changes affecting compatibility:
1616 * Statically compiled applications attempting to load locales compiled for the
1617 GNU C Library version 2.27 will fail and fall back to the builtin C/POSIX
1618 locale. The reason for this is that the addition of the new "%OB" and "%Ob",
1619 support for two grammatical forms of the month names, also extends the locale
1620 data binary format. Static applications needing locale support must be
1621 recompiled to match the runtime and data they are deployed with. In some
1622 distributions there is an upgrade window where dynamically linked applications
1623 may use a new library but the old locale data and also fall back to the
1624 builtin C/POSIX locales; restarting the application process is sufficient to
1627 * Support for statically linked applications which call dlopen is deprecated
1628 and will be removed in a future version of glibc. Applications which call
1629 dlopen need to be linked dynamically instead.
1631 * Support for old programs which use internal stdio data structures and
1632 functions is deprecated. This includes programs which use the C++ streams
1633 provided by libstdc++ in GCC 2.95. Programs which use the internal
1634 symbols _IO_adjust_wcolumn, _IO_default_doallocate, _IO_default_finish,
1635 _IO_default_pbackfail, _IO_default_uflow, _IO_default_xsgetn,
1636 _IO_default_xsputn, _IO_doallocbuf, _IO_do_write, _IO_file_attach,
1637 _IO_file_close, _IO_file_close_it, _IO_file_doallocate, _IO_file_fopen,
1638 _IO_file_init, _IO_file_jumps, _IO_fileno, _IO_file_open,
1639 _IO_file_overflow, _IO_file_read, _IO_file_seek, _IO_file_seekoff,
1640 _IO_file_setbuf, _IO_file_stat, _IO_file_sync, _IO_file_underflow,
1641 _IO_file_write, _IO_file_xsputn, _IO_flockfile, _IO_flush_all,
1642 _IO_flush_all_linebuffered, _IO_free_backup_area, _IO_free_wbackup_area,
1643 _IO_init, _IO_init_marker, _IO_init_wmarker, _IO_iter_begin, _IO_iter_end,
1644 _IO_iter_file, _IO_iter_next, _IO_least_wmarker, _IO_link_in,
1645 _IO_list_all, _IO_list_lock, _IO_list_resetlock, _IO_list_unlock,
1646 _IO_marker_delta, _IO_marker_difference, _IO_remove_marker, _IO_seekmark,
1647 _IO_seekwmark, _IO_str_init_readonly, _IO_str_init_static,
1648 _IO_str_overflow, _IO_str_pbackfail, _IO_str_seekoff, _IO_str_underflow,
1649 _IO_switch_to_main_wget_area, _IO_switch_to_wget_mode,
1650 _IO_unsave_wmarkers, _IO_wdefault_doallocate, _IO_wdefault_finish,
1651 _IO_wdefault_pbackfail, _IO_wdefault_setbuf, _IO_wdefault_uflow,
1652 _IO_wdefault_xsgetn, _IO_wdefault_xsputn, _IO_wdoallocbuf, _IO_wdo_write,
1653 _IO_wfile_jumps, _IO_wfile_overflow, _IO_wfile_sync, _IO_wfile_underflow,
1654 _IO_wfile_xsputn, _IO_wmarker_delta, or _IO_wsetb may stop working with a
1655 future version of glibc. Unlike other symbol removals, these old
1656 applications will not be supported using compatibility symbols.
1658 * On GNU/Linux, the obsolete Linux constant PTRACE_SEIZE_DEVEL is no longer
1659 defined by <sys/ptrace.h>.
1661 * libm no longer supports SVID error handling (calling a user-provided
1662 matherr function on error) or the _LIB_VERSION variable to control error
1663 handling. (SVID error handling and the _LIB_VERSION variable still work
1664 for binaries linked against older versions of the GNU C Library.) The
1665 libieee.a library is no longer provided. math.h no longer defines struct
1666 exception, or the macros X_TLOSS, DOMAIN, SING, OVERFLOW, UNDERFLOW,
1667 TLOSS, PLOSS and HUGE.
1669 * The libm functions pow10, pow10f and pow10l are no longer supported for
1670 new programs. Programs should use the standard names exp10, exp10f and
1671 exp10l for these functions instead.
1673 * The mcontext_t type is no longer the same as struct sigcontext. On
1674 platforms where it was previously the same, this changes the C++ name
1675 mangling for interfaces involving this type.
1677 * The add-ons mechanism for building additional packages at the same time as
1678 glibc has been removed. The --enable-add-ons configure option is now
1681 * The --without-fp configure option is now ignored. Whether hardware
1682 floating-point instructions are used is now configured based on whether
1683 the compiler used at configure time (without any options implied by a
1684 --with-cpu= configure option) uses such instructions.
1686 * The res_hnok, res_dnok, res_mailok and res_ownok functions now check that
1687 the specified string can be parsed as a domain name.
1689 * In the malloc_info output, the <heap> element may contain another <aspace>
1690 element, "subheaps", which contains the number of sub-heaps.
1692 * The libresolv function p_secstodate is no longer supported for new
1695 * The tilepro-*-linux-gnu configuration is no longer supported.
1697 * The nonstandard header files <libio.h> and <_G_config.h> are deprecated
1698 and will be removed in a future release. Software that is still using
1699 either header should be updated to use standard <stdio.h> interfaces
1702 libio.h was originally the header for a set of supported GNU extensions,
1703 but they have not been maintained as such in many years, they are now
1704 standing in the way of improvements to stdio, and we don't think there are
1705 any remaining external users. _G_config.h was never intended for public
1706 use, but predates the bits convention.
1708 Changes to build and runtime requirements:
1710 * bison version 2.7 or later is required to generate code in the 'intl'
1713 Security related changes:
1715 CVE-2009-5064: The ldd script would sometimes run the program under
1716 examination directly, without preventing code execution through the
1717 dynamic linker. (The glibc project disputes that this is a security
1718 vulnerability; only trusted binaries must be examined using the ldd
1721 CVE-2017-15670: The glob function, when invoked with GLOB_TILDE,
1722 suffered from a one-byte overflow during ~ operator processing (either
1723 on the stack or the heap, depending on the length of the user name).
1724 Reported by Tim Rühsen.
1726 CVE-2017-15671: The glob function, when invoked with GLOB_TILDE,
1727 would sometimes fail to free memory allocated during ~ operator
1728 processing, leading to a memory leak and, potentially, to a denial
1731 CVE-2017-15804: The glob function, when invoked with GLOB_TILDE and
1732 without GLOB_NOESCAPE, could write past the end of a buffer while
1733 unescaping user names. Reported by Tim Rühsen.
1735 CVE-2017-17426: The malloc function, when called with an object size near
1736 the value SIZE_MAX, would return a pointer to a buffer which is too small,
1737 instead of NULL. This was a regression introduced with the new malloc
1738 thread cache in glibc 2.26. Reported by Iain Buclaw.
1740 CVE-2017-1000408: Incorrect array size computation in _dl_init_paths leads
1741 to the allocation of too much memory. (This is not a security bug per se,
1742 it is mentioned here only because of the CVE assignment.) Reported by
1745 CVE-2017-1000409: Buffer overflow in _dl_init_paths due to miscomputation
1746 of the number of search path components. (This is not a security
1747 vulnerability per se because no trust boundary is crossed if the fix for
1748 CVE-2017-1000366 has been applied, but it is mentioned here only because
1749 of the CVE assignment.) Reported by Qualys.
1751 CVE-2017-16997: Incorrect handling of RPATH or RUNPATH containing $ORIGIN
1752 for AT_SECURE or SUID binaries could be used to load libraries from the
1755 CVE-2018-1000001: Buffer underflow in realpath function when getcwd function
1756 succeeds without returning an absolute path due to unexpected behaviour
1757 of the Linux kernel getcwd syscall. Reported by halfdog.
1759 CVE-2018-6485: The posix_memalign and memalign functions, when called with
1760 an object size near the value of SIZE_MAX, would return a pointer to a
1761 buffer which is too small, instead of NULL. Reported by Jakub Wilk.
1763 CVE-2018-6551: The malloc function, when called with an object size near
1764 the value of SIZE_MAX, would return a pointer to a buffer which is too
1765 small, instead of NULL.
1767 The following bugs are resolved with this release:
1769 [866] glob: glob should match dangling symlinks
1770 [1062] glob: sysdeps/generic/glob.c merge from gnulib (part 3 of 3)
1771 [2522] localedata: ca_ES@valencia: new Valencian (meridional Catalan)
1773 [5997] math: Very slow execution of sinf function
1774 [10580] localedata: hr_HR: updated locale
1775 [10871] locale: 'mon' array should contain both nominative and genitive
1777 [12349] localedata: eu_ES: incorrect thousands separator
1778 [13605] localedata: shn_MM: new Shan locale
1779 [13805] localedata: ru_RU: currency should use ',' as radix point
1780 [13953] localedata: km_KH: locale update
1781 [13994] localedata: mjw_IN: new locale
1782 [14121] build: make writes .mo files in po directory
1783 [14333] libc: Fix the race between atexit() and exit()
1784 [14681] dynamic-link: _dl_get_origin leaks memory via executable link map.
1785 [14925] localedata: bn_*: LC_IDENTIFICATION.language key should be
1787 [15260] localedata: LC_MESSAGES.{yes,no}{str,expr}: various errors
1788 [15261] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of full-
1789 width Latin characters
1790 [15332] localedata: es_CU: locale update
1791 [15436] stdio: Don't close or flush stdio streams on abort
1792 [15537] localedata: lv_LV: invalid collation for Latvian diacritical
1794 [16148] localedata: ca_ES: incorrect thousands separator
1795 [16750] dynamic-link: ldd should not try to execute the binaries
1797 [16777] localedata: pl_PL: incorrect thousands separator in locale
1798 [16905] localedata: hanzi: new collation
1799 [17563] localedata: cmn_TW: add hanzi collation
1800 [17750] localedata: wrong collation order of diacritics in most locales
1801 [17804] libc: scandirat fails with ENOMEM because it checks for errno even
1803 [17956] build: Build fails on missing definitions from header file
1804 nss/nss.h when Mozilla NSS is used for cryptography
1805 [18203] libc: realpath() does not handle unreachable paths correctly
1806 [18572] dynamic-link: [arm] Lazy TLSDESC relocation has data race
1807 [18812] localedata: kab_DZ: new Kabyle Algeria locale
1808 [18822] libc: Internal functions are called via PLT
1809 [18858] string: _HAVE_STRING_ARCH_xxx aren't defined for i386 nor x86_64
1810 [19170] libc: __gmon_start__ defined in hppa in crtn.S
1811 [19574] libc: glibc should support building static PIE binaries
1812 [19852] localedata: charmaps/UTF-8: incorrect wcwidth for U+3099 and
1814 [19971] glob: glob: Do not skip entries with zero d_ino values
1815 [19982] localedata: fr.po: spelling mistake for error code EXDEV
1816 [20008] localedata: km_KH: convert to translit_neutral
1817 [20009] localedata: tr_TR: convert LC_CTYPE to i18n
1818 [20142] math: [x86_64] Add SSE4.1 trunc, truncf
1819 [20204] dynamic-link: _dl_open_hook and _dlfcn_hook hardening
1820 [20482] localedata: de_CH: abbreviated weekdays should be two letters
1821 [20498] localedata: miq_NI: new Mískitu / Miskito (miq) language locale
1823 [20532] nss: getaddrinfo uses errno and h_errno without guaranteeing
1824 they're set, wrong errors returned by gaih_inet when lookup functions
1826 [20756] localedata: [PATCH] Use Unicode wise thousands separator
1827 [20826] network: posix/tst-getaddrinfo5 fails on hosts without network
1829 [20952] localedata: yuw_PG: new locale
1830 [21084] localedata: charmaps/IBM858: new codepage
1831 [21161] manual: [PATCH] fix typo in manual/arith.texi on strtoul prototype
1832 [21242] libc: assert gives pedantic warning in old gcc versions
1833 [21265] dynamic-link: _dl_runtime_resolve isn't compatible with Intel C++
1834 __regcall calling convention
1835 [21309] math: signed integer overflow in sysdeps/ieee754/dbl-64/e_pow.c
1836 [21326] libc: C99 functions are not declared for C++11 and later if
1837 _GNU_SOURCE is not predefined by g++
1838 [21457] libc: sys/ucontext.h namespace
1839 [21530] libc: tmpfile() should be implemented using O_TMPFILE
1840 [21660] math: GCC fails to compile a formula with tgmath.h
1841 [21672] nptl: sys-libs/glibc on ia64 crashes on thread exit: signal
1842 SIGSEGV, Segmentation fault: pthread_create.c:432: __madvise
1843 (pd->stackblock, freesize - PTHREAD_STACK_MIN, MADV_DONTNEED);
1844 [21684] math: tgmath.h handling of complex integers
1845 [21685] math: tgmath.h handling of bit-fields
1846 [21686] math: tgmath.h handling of __int128
1847 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
1849 [21745] libc: [powerpc64le] Extra PLT reference with --enable-stack-
1851 [21750] localedata: column width of characters incompatible with classical
1853 [21754] malloc: malloc: Perform as little work as possible after heap
1854 consistency check failures
1855 [21780] libc: hppa: p{read,write}v2 does not set ENOSUP on invalid flag
1856 [21790] libc: Missing __memset_zero_constant_len_parameter in libc.so
1857 [21791] string: Unused XXX_chk_XXX functions in libc.a
1858 [21815] dynamic-link: FAIL: elf/tst-prelink-cmp with GCC is defaulted to
1860 [21836] localedata: Removed redundant data (LC_MONETARY) in various Indian
1862 [21845] localedata: Added new Locale bho_NP
1863 [21853] localedata: Fix abday Which looks same as day in zh_SG
1864 [21854] localedata: Added New Locale en_SC
1865 [21864] libc: xmalloc.o is compiled with -DMODULE_NAME=libc
1866 [21871] dynamic-link: _dl_runtime_resolve_avx_opt is slower than
1867 _dl_runtime_resolve_avx_slow
1868 [21885] network: getaddrinfo: gethosts does not release resolver context
1869 on memory allocation failure
1870 [21899] libc: XPG4.2 sigaction namespace
1871 [21908] dynamic-link: dynamic linker broke on ia64 (mmap2 consolidation is
1873 [21913] libc: static binaries SIGSEGV in __brk when host's gcc is pie-by-
1875 [21915] nss: nss_files can return with NSS_STATUS_SUCCESS and a clobbered
1876 errno value, causing getaddrinfo to fail
1877 [21920] localedata: Fix p_cs_precedes/n_cs_precedes for mt_MT
1878 [21922] network: getaddrinfo with AF_INET/AF_INET6 returns EAI_NONAME
1879 instead of EAI_NODATA
1880 [21928] libc: sys/ptrace.h: remove obsolete temporary development Linux
1881 constant PTRACE_SEIZE_DEVEL
1882 [21930] math: C-only gcc builtins used in <math.h> isinf
1883 [21932] network: Unpaired __resolv_context_get in generic get*_r
1885 [21941] math: powerpc: Wrong register constraint for xssqrtqp in sqrtf128
1886 [21944] libc: sigval namespace
1887 [21951] localedata: Update hanzi collation by stroke
1888 [21955] math: Wrong alignment of L(SP_RANGE)/L(SP_INF_0) in
1889 sysdeps/x86_64/fpu/e_expf.S
1890 [21956] libc: Stack allocation in MIPS syscall impl (ubounded stack
1891 allocation in syscall loops)
1892 [21959] localedata: Fix Country name for xh_ZA
1893 [21960] localedata: Fix abmon for bem_ZM
1894 [21966] math: AVX2 mathvec functions use FMA without checking
1895 [21967] math: When 512-bit AVX2 wrapper functions in mathvec are used?
1896 [21971] localedata: Added New Locale for mfe_MU
1897 [21972] libc: assert macro requires operator== (int) for its argument type
1898 [21973] math: [sparc] libm missing sqrtl compat symbol
1899 [21974] libc: Remove __bb_init_func and __bb_exit_func
1900 [21982] string: stratcliff.c: error: assuming signed overflow does not
1902 [21986] stdio: __guess_grouping is called incorrectly
1903 [21987] math: [sparc32] wrong bits/long-double.h installed
1904 [22019] localedata: Wrong placement of monetary symbol in el_GR (negative
1906 [22022] localedata: Missing country_name for mni_IN
1907 [22023] localedata: Removed redundant data (LC_TIME and LC_MESSAGES) for
1909 [22025] locale: iconv: Inconsistency between pointer mangling and NULL
1911 [22026] locale: iconv_open: heap overflow on gconv_init failure
1912 [22028] math: bits/math-finite.h _MSUF_ expansion namespace
1913 [22035] math: [m68k] bits/math-inline.h macro namespace
1914 [22038] localedata: Fix abbreviated weeks and months for Somali
1915 [22044] localedata: Remove redundant data for Limburgish Language
1916 [22050] malloc: Linking with -lmcheck does not hook
1917 __malloc_initialize_hook correctly
1918 [22051] libc: zero terminator in the middle of glibc's .eh_frame
1919 [22052] malloc: malloc failed to compile with GCC 7 and -O3
1920 [22070] localedata: charmaps/UTF-8: wcwidth for
1921 Prepended_Concatenation_Mark codepoints set to 0 (should be 1)
1922 [22074] localedata: charmaps/UTF-8: wcwidth for U+1160-U+11FF (Hangul
1923 Jungseong and Jongseong) should be 0
1924 [22078] nss: nss_files performance issue in multi mode
1925 [22082] math: bits/math-finite.h exp10 condition
1926 [22086] libc: pcprofiledump incorrect cross-endian condition
1927 [22093] dynamic-link: ld.so no longer searches in .../x86_64
1928 [22095] network: Name server address allocation memory leak in resolv.conf
1930 [22096] network: __resolv_conf_attach can incorrectly free passed conf
1932 [22100] localedata: om_KE: LC_TIME: copy redundant data from om_ET
1933 [22101] dynamic-link: Dynamic loader must ignore "debug" shared objects
1935 [22111] malloc: malloc: per thread cache is not returned when thread exits
1936 [22112] localedata: Fix LC_TELEPHONE/LC_NAME for az_AZ
1937 [22134] libc: [linux] implement fexecve with execveat
1938 [22142] libc: [powerpc] printf outputs a wrong value of DBL_MAX on ppc64 and
1940 [22145] libc: ttyname() gives up too early in the face of namespaces
1941 [22146] math: C++ build issue with float128 on x86_64
1942 [22153] nptl: nptl: save error code before process termination
1943 [22156] libc: [hppa,ia64,microblaze] Executable stack default
1944 [22159] malloc: malloc: MALLOC_CHECK_ broken with --enable-tunables=no
1945 [22161] nscd: nscd cache prune for netgroups hangs after timeout bump
1946 [22165] libc: [hppa] Text relocations in libc.so
1947 [22180] libc: destructor registered via __cxa_atexit is called twice
1948 [22183] glob: commit 5554304f0ddd ("posix: Allow glob to match dangling
1949 symlinks") cause "make" segfaults
1950 [22189] math: [powerpc] math_private.h definitions of math_opt_barrier and
1952 [22207] libc: FAIL: stdlib/test-atexit-race
1953 [22225] math: nearbyint arithmetic moved before feholdexcept
1954 [22229] math: [sparc32] missing copysignl, fabsl, fmal compat symbols
1955 [22235] math: iscanonical in C++ and float128
1956 [22243] math: log2(0) and log10(0) are wrong in downward rounding without
1957 the svid compat wrapper
1958 [22244] math: ynf and yn are wrong without the svid compat wrapper
1959 [22273] libc: Improper assert in Linux posix_spawn implementation
1960 [22284] libc: -pg -pie doesn't work
1961 [22292] locale: localedef exits with error 4 when it should be error 1
1962 [22294] locale: Allow "" for int_currency_symbol definition in locales.
1963 [22295] locale: Don't warn on non-symbolic characters in locale sources in
1965 [22296] math: glibc 2.26: signbit build issue with Gcc 5.5.0 on x86_64
1966 [22298] nptl: x32: lockups on recursive pthread_mutex_lock after upgrade
1968 [22299] dynamic-link: Problem with $PLATFORM on x86_64 platform
1969 [22320] glob: Buffer overflow in glob with GLOB_TILDE (CVE-2017-15670)
1970 [22321] libc: sysconf(_SC_IOV_MAX) returns -1 on Linux
1971 [22322] libc: [mips64] wrong bits/long-double.h installed
1972 [22325] glob: Memory leak in glob with GLOB_TILDE (CVE-2017-15671)
1973 [22332] glob: Buffer overflow in glob with GLOB_TILDE in unescaping
1975 [22336] localedata: cs_CZ LC_COLLATE does not use i18n
1976 [22343] malloc: Integer overflow in posix_memalign
1977 [22347] libc: getrandom() returns the number of bytes that were copied to
1978 the buffer even though the comments say "Return 0 on success and -1 on
1980 [22353] string: sysdeps/i386/i586/strcpy.S isn't maintainable
1981 [22362] libc: Installed crt1.o, crti,.o and crtn.o files are used with
1983 [22370] dynamic-link: Incorrect note padding check
1984 [22375] libc: malloc returns pointer from tcache_get when should return
1985 NULL (CVE-2017-17426)
1986 [22377] math: iseqsig, float128 and C++
1987 [22382] localedata: Error in tpi_PG locale
1988 [22387] localedata: Replace unicode sequences <Uxxxx> for characters
1989 inside the ASCII printable range
1990 [22402] math: [powerpc64le] __MATH_TG does not support _Float128 for
1992 [22403] localedata: Slash needs escaping in some locales
1993 [22408] malloc: malloc_info access heaps without arena lock, ignores heaps
1994 [22409] network: res_hnok does not accept some host names used on the
1996 [22412] network: res_dnok, res_hnok should perform syntax checks
1997 [22413] network: ns_name_pton ignores syntactically invalid trailing
1999 [22415] stdio: setvbuf can lead to invalid free/segfault
2000 [22432] build: Non-deterministic build
2001 [22439] malloc: malloc_info should compute summary statistics for all sub-
2003 [22442] network: if_nametoindex could report index for the wrong
2004 networking interface
2005 [22446] build: aliasing violation calling readlink in handle_request
2006 [22447] build: unsafe call to strlen with a non-string in getlogin_r.c
2007 [22457] libc: Generic preadv/pwritev incorrectly calls __posix_memalign
2008 [22459] libc: FAIL: elf/check-localplt with __stack_chk_fail related to
2009 __nscd_hash/__nss_hash
2010 [22463] network: p_secstodate overflow handling
2011 [22469] localedata: pl_PL LC_COLLATE does not use i18n
2012 [22478] libc: sigwait can fail with EINTR
2013 [22505] libc: ldconfig processes include directive in locale-specific
2015 [22515] localedata: hsb_DE LC_COLLATE does not use copy "iso14651_t1"
2016 [22517] localedata: et_EE LC_COLLATE does not use copy "iso14651_t1"
2017 [22519] localedata: is_IS LC_COLLATE does not use copy "iso14651_t1"
2018 [22524] localedata: lt_LT LC_COLLATE does not use copy "iso14651_t1"
2019 [22527] localedata: tr_TR LC_COLLATE does not use copy "iso14651_t1"
2020 [22534] localedata: Collation rules for Serbian and Bosnian should be the
2021 same as for Croatian
2022 [22561] math: [DR#471] cacosh (0 + iNaN) should return NaN +/- i pi/2
2023 [22568] math: [DR#471] ctanh (0 + iNaN), ctanh (0 + i Inf)
2024 [22577] libc: missing newline after "cannot allocate TLS data structures
2026 [22588] manual: manual/conf.texi: missing underscore in front of
2028 [22593] math: nextafter and nexttoward are declared with const attribute
2029 [22596] manual: manual: finite(nan) wrongly described as returning nonzero
2030 [22603] string: ia64 memchr overflows internal pointer check
2031 [22605] libc: SH clone does not set the exit code correctly
2032 [22606] dynamic-link: Incorrect array size computation in _dl_init_paths
2034 [22607] dynamic-link: Buffer Overflow in _dl_init_paths (CVE-2017-1000409)
2035 [22611] malloc: malloc/tst-realloc wrongly assumes that errno must not be
2036 modified in case of success
2037 [22614] build: gcc: error: unrecognized command line option ‘-no-pie’
2038 [22615] manual: manual: ambiguous wording about errno value in case of
2040 [22624] libc: MIPS setjmp() saves incorrect 'o0' register in --enable-
2042 [22625] dynamic-link: RPATH $ORIGIN replaced by PWD for AT_SECURE/SUID
2043 binaries or if /proc is not mounted (CVE-2017-16997)
2044 [22627] dynamic-link: $ORIGIN in $LD_LIBRARY_PATH is substituted twice
2045 [22630] build: $(no-pie-ldflag) is no longer effective
2046 [22631] math: [m68k] Bad const attributes in bits/mathinline.h
2047 [22635] nptl: pthread_self returns NULL before libpthread is loaded
2048 [22636] nptl: PTHREAD_STACK_MIN is too small on x86-64
2049 [22637] nptl: guard size is subtracted from thread stack size instead of
2051 [22648] libc: getrlimit/setrlimit with RLIM_INFINITY broken on alpha
2052 [22657] localedata: hu_HU: Avoid double space in date
2053 [22660] math: fmax, fmin sNaN handling on alpha
2054 [22664] libc: New warning of GCC8
2055 [22665] math: alpha: ceil and floor raise inexact exceptions
2056 [22666] math: alpha: trunc raise inexact exceptions
2057 [22667] libc: makecontext lacks stack alignment on i386
2058 [22678] libc: prlimit fails for RLIM_INFINITY values on 32-bit machines
2059 [22679] libc: getcwd(3) can succeed without returning an absolute path
2061 [22685] libc: PowerPC: Static AT_SECURE binaries segfault with lock-
2062 elision and tunables
2063 [22687] math: [powerpc-nofpu] complex long double functions spurious
2065 [22688] math: [powerpc-nofpu] remainderl wrong sign of zero result
2066 [22690] math: [ldbl-128ibm] lrintl, lroundl missing "invalid" exceptions
2067 [22691] math: [powerpc-nofpu] fmaxmagl, fminmagl spurious "invalid"
2069 [22693] math: [ldbl-128ibm] log1pl (-qNaN) spurious "invalid" exception
2070 [22697] math: [powerpc] llround spurious "inexact" exceptions on 32-bit
2072 [22701] nis: Incomplete removal of libnsl
2073 [22702] math: [powerpc-nofpu] nearbyintl traps with trapping "inexact"
2074 [22707] libc: Missing defines in elf.h for DF_1_STUB and DF_1_PIE.
2075 [22715] dynamic-link: FAIL: elf/tst-audit10
2076 [22719] libc: Backtrace tests fail on hppa
2077 [22742] libc: [aarch64] mcontext_t __reserved field got renamed
2078 [22743] nptl: __pthread_register_cancel corrupts stack after f81ddabffd
2079 [22765] crypt: (struct crypt_data *data)->initialized is not set to zero
2080 before the first call to crypt_r () in crypt/badsalttest.c
2087 * A per-thread cache has been added to malloc. Access to the cache requires
2088 no locks and therefore significantly accelerates the fast path to allocate
2089 and free small amounts of memory. Refilling an empty cache requires locking
2090 the underlying arena. Performance measurements show significant gains in a
2091 wide variety of user workloads. Workloads were captured using a special
2092 instrumented malloc and analyzed with a malloc simulator. Contributed by
2093 DJ Delorie with the help of Florian Weimer, and Carlos O'Donell.
2095 * Unicode 10.0.0 Support: Character encoding, character type info, and
2096 transliteration tables are all updated to Unicode 10.0.0, using
2097 generator scripts contributed by Mike FABIAN (Red Hat).
2098 These updates cause user visible changes, especially the changes in
2099 wcwidth for many emoji characters cause problems when emoji sequences
2100 are rendered with pango, see for example:
2101 https://bugzilla.gnome.org/show_bug.cgi?id=780669#c5
2103 * Collation of Hungarian has been overhauled and is now consistent with "The
2104 Rules of Hungarian Orthography, 12th edition" (Bug 18934). Contributed by
2107 * Improvements to the DNS stub resolver, contributed by Florian Weimer:
2109 - The GNU C Library will now detect when /etc/resolv.conf has been
2110 modified and reload the changed configuration. The new resolver option
2111 “no-reload” (RES_NORELOAD) disables this behavior.
2113 - The GNU C Library now supports an arbitrary number of search domains
2114 (configured using the “search” directive in /etc/resolv.conf);
2115 previously, there was a hard limit of six domains. For backward
2116 compatibility, applications that directly modify the ‘_res’ global
2117 object are still limited to six search domains.
2119 - When the “rotate” (RES_ROTATE) resolver option is active, the GNU C
2120 Library will now randomly pick a name server from the configuration as a
2121 starting point. (Previously, the second name server was always used.)
2123 * The tunables feature is now enabled by default. This allows users to tweak
2124 behavior of the GNU C Library using the GLIBC_TUNABLES environment variable.
2126 * New function reallocarray, which resizes an allocated block (like realloc)
2127 to the product of two sizes, with a guaranteed clean failure upon integer
2128 overflow in the multiplication. Originally from OpenBSD, contributed by
2129 Dennis Wölfing and Rüdiger Sonderfeld.
2131 * New wrappers for the Linux-specific system calls preadv2 and pwritev2.
2132 These are extended versions of preadv and pwritev, respectively, taking an
2133 additional flags argument. The set of supported flags depends on the
2134 running kernel; full support currently requires kernel 4.7 or later.
2136 * posix_spawnattr_setflags now supports the flag POSIX_SPAWN_SETSID, to
2137 create a new session ID for the spawned process. This feature is
2138 scheduled to be added to the next major revision of POSIX; for the time
2139 being, it is available under _GNU_SOURCE.
2141 * errno.h is now safe to use from C-preprocessed assembly language on all
2142 supported operating systems. In this context, it will only define the
2143 Exxxx constants, as preprocessor macros expanding to integer literals.
2145 * On ia64, powerpc64le, x86-32, and x86-64, the math library now implements
2146 128-bit floating point as defined by ISO/IEC/IEEE 60559:2011 (IEEE
2147 754-2008) and ISO/IEC TS 18661-3:2015. Contributed by Paul E. Murphy,
2148 Gabriel F. T. Gomes, Tulio Magno Quites Machado Filho, and Joseph Myers.
2150 To compile programs that use this feature, the compiler must support
2151 128-bit floating point with the type name _Float128 (as defined by TS
2152 18661-3) or __float128 (the nonstandard name used by GCC for C++, and for
2153 C prior to version 7). _GNU_SOURCE or __STDC_WANT_IEC_60559_TYPES_EXT__
2154 must be defined to make the new interfaces visible.
2156 The new functions and macros correspond to those present for other
2157 floating-point types (except for a few obsolescent interfaces not
2158 supported for the new type), with F128 or f128 suffixes; for example,
2159 strtof128, HUGE_VAL_F128 and cosf128. Following TS 18661-3, there are no
2160 printf or scanf formats for the new type; the strfromf128 and strtof128
2161 interfaces should be used instead.
2163 Deprecated and removed features, and other changes affecting compatibility:
2165 * The synchronization that pthread_spin_unlock performs has been changed to
2166 now be equivalent to a C11 atomic store with release memory order to the
2167 spin lock's memory location. Previously, several (but not all)
2168 architectures used stronger synchronization (e.g., containing what is
2169 often called a full barrier). This change can improve performance, but
2170 may affect odd fringe uses of spin locks that depend on the previous
2171 behavior (e.g., using spin locks as atomic variables to try to implement
2172 Dekker's mutual exclusion algorithm).
2174 * The port to Native Client running on ARMv7-A (--host=arm-nacl) has been
2177 * Sun RPC is deprecated. The rpcgen program, librpcsvc, and Sun RPC headers
2178 will only be built and installed when the GNU C Library is configured with
2179 --enable-obsolete-rpc. This allows alternative RPC implementations, such
2180 as TIRPC or rpcsvc-proto, to be used.
2182 * The NIS(+) name service modules, libnss_nis, libnss_nisplus, and
2183 libnss_compat, are deprecated, and will not be built or installed by
2186 The NIS(+) support library, libnsl, is also deprecated. By default, a
2187 compatibility shared library will be built and installed, but not headers
2188 or development libraries. Only a few NIS-related programs require this
2189 library. (In particular, the GNU C Library has never required programs
2190 that use 'gethostbyname' to be linked with libnsl.)
2192 Replacement implementations based on TIRPC, which additionally support
2193 IPv6, are available from <https://github.com/thkukuk/>. The configure
2194 option --enable-obsolete-nsl will cause libnsl's headers, and the NIS(+)
2195 name service modules, to be built and installed.
2197 * The DNS stub resolver no longer performs EDNS fallback. If EDNS or DNSSEC
2198 support is enabled, the configured recursive resolver must support EDNS.
2199 (Responding to EDNS-enabled queries with responses which are not
2200 EDNS-enabled is fine, but FORMERR responses are not.)
2202 * res_mkquery and res_nmkquery no longer support the IQUERY opcode. DNS
2203 servers have not supported this opcode for a long time.
2205 * The _res_opcodes variable has been removed from libresolv. It had been
2206 exported by accident.
2208 * <string.h> no longer includes inline versions of any string functions,
2209 as this kind of optimization is better done by the compiler. The macros
2210 __USE_STRING_INLINES and __NO_STRING_INLINES no longer have any effect.
2212 * The nonstandard header <xlocale.h> has been removed. Most programs should
2213 use <locale.h> instead. If you have a specific need for the definition of
2214 locale_t with no other declarations, please contact
2215 libc-alpha@sourceware.org and explain.
2217 * The obsolete header <sys/ultrasound.h> has been removed.
2219 * The obsolete signal constant SIGUNUSED is no longer defined by <signal.h>.
2221 * The obsolete function cfree has been removed. Applications should use
2224 * The stack_t type no longer has the name struct sigaltstack. This changes
2225 the C++ name mangling for interfaces involving this type.
2227 * The ucontext_t type no longer has the name struct ucontext. This changes
2228 the C++ name mangling for interfaces involving this type.
2230 * On M68k GNU/Linux and MIPS GNU/Linux, the fpregset_t type no longer has
2231 the name struct fpregset. On Nios II GNU/Linux, the mcontext_t type no
2232 longer has the name struct mcontext. On SPARC GNU/Linux, the struct
2233 mc_fq, struct rwindow, struct fpq and struct fq types are no longer
2234 defined in sys/ucontext.h, the mc_fpu_t type no longer has the name struct
2235 mc_fpu, the gwindows_t type no longer has the name struct gwindows and the
2236 fpregset_t type no longer has the name struct fpu. This changes the C++
2237 name mangling for interfaces involving those types.
2239 * On S/390 GNU/Linux, the constants defined by <sys/ptrace.h> have been
2240 synced with the kernel:
2242 - PTRACE_GETREGS, PTRACE_SETREGS, PTRACE_GETFPREGS and PTRACE_SETFPREGS
2243 are not supported on this architecture and have been removed.
2245 - PTRACE_SINGLEBLOCK, PTRACE_SECCOMP_GET_FILTER, PTRACE_PEEKUSR_AREA,
2246 PTRACE_POKEUSR_AREA, PTRACE_GET_LAST_BREAK, PTRACE_ENABLE_TE,
2247 PTRACE_DISABLE_TE and PTRACE_TE_ABORT_RAND have been added.
2249 Programs that assume the GET/SETREGS ptrace requests are universally
2250 available will now fail to build, instead of malfunctioning at runtime.
2252 Changes to build and runtime requirements:
2254 * Linux kernel 3.2 or later is required at runtime, on all architectures
2255 supported by that kernel. (This is a change from version 2.25 only for
2258 * GNU Binutils 2.25 or later is now required to build the GNU C Library.
2260 * On most architectures, GCC 4.9 or later is required to build the GNU C
2261 Library. On powerpc64le, GCC 6.2 or later is required.
2263 Older GCC versions and non-GNU compilers are still supported when
2264 compiling programs that use the GNU C Library. (We do not know exactly
2265 how old, and some GNU extensions to C may be _de facto_ required. If you
2266 are interested in helping us make this statement less vague, please
2267 contact libc-alpha@sourceware.org.)
2269 Security related changes:
2271 * The DNS stub resolver limits the advertised UDP buffer size to 1200 bytes,
2272 to avoid fragmentation-based spoofing attacks (CVE-2017-12132).
2274 * LD_LIBRARY_PATH is now ignored in binaries running in privileged AT_SECURE
2275 mode to guard against local privilege escalation attacks (CVE-2017-1000366).
2277 * Avoid printing a backtrace from the __stack_chk_fail function since it is
2278 called on a corrupt stack and a backtrace is unreliable on a corrupt stack
2281 * A use-after-free vulnerability in clntudp_call in the Sun RPC system has been
2282 fixed (CVE-2017-12133).
2284 The following bugs are resolved with this release:
2286 [984] network: Respond to changed resolv.conf in gethostbyname
2287 [5010] network: sunrpc service cleanup causes unwanted port mapper traffic
2288 [12068] localedata: sc_IT: misspelled yesexpr/day/abday/mon/abmon/date_fmt
2290 [12189] libc: __stack_chk_fail should not attempt a backtrace
2292 [14096] time: Race condition on timezone/tst-timezone.out
2293 [14172] localedata: az_IR: new locale
2294 [14995] build: glibc fails to build if gold is the default linker, even if
2296 [15998] build: [powerpc] Set arch_minimum_kernel for powerpc LE
2297 [16637] network: inet_pton function is accepting IPv6 with bad format
2298 [16640] string: string/strtok.c: undefined behaviour inconsistent between
2299 x86 and other generic code
2300 [16875] localedata: ko_KR: fix lang_name
2301 [17225] localedata: ar_SY: localized month names for May and June are
2303 [17297] localedata: da_DK: wrong date_fmt string
2304 [18907] stdio: Incorrect order of __wur __THROW in <printf.h>
2305 [18934] localedata: hu_HU: collate: fix multiple bugs and add tests
2306 [18988] nptl: pthread wastes memory with mlockall(MCL_FUTURE)
2307 [19066] localedata: ar_SA abbreviated day and month names are in English
2308 [19569] network: resolv: Support an arbitrary number of search domains
2309 [19570] network: Implement random DNS server selection in the stub
2311 [19838] locale: localedef fails on PA-RISC
2312 [19919] localedata: iso14651_t1_common: Correct the Malayalam sorting
2313 order of 0D36 and 0D37
2314 [19922] localedata: iso14651_t1_common: Define collation for Malayalam
2316 [20098] libc: FAIL: debug/backtrace-tst on hppa
2317 [20257] network: sunrpc: clntudp_call does not enforce timeout when
2319 [20275] localedata: locale day/abday/mon/abmon should not have trailing
2321 [20313] localedata: Update locale data to Unicode 9.0
2322 [20424] manual: Document how to provide a malloc replacement
2323 [20496] localedata: agr_PE: new language locale Awajún / Aguaruna (agr)
2325 [20686] locale: Add el_GR@euro to SUPPORTED.
2326 [20831] dynamic-link: _dl_map_segments does not test for __mprotect
2327 failures consistently
2328 [21015] dynamic-link: Document and fix --enable-bind-now
2329 [21016] nptl: pthread_cond support is broken on hppa
2330 [21029] libc: glibc-2.23 (and later) fails to compile with -fno-omit-
2331 frame-pointer on i386
2332 [21049] libc: segfault in longjmp_chk() due to clobbered processor
2334 [21075] libc: unused assigment to %g4 in sparc/sparc{64,32}/clone.S
2335 [21088] libc: Build fails with --enable-static-nss
2336 [21094] math: cosf(1.57079697) has 3 ulp error on targets where the
2337 generic c code is used
2338 [21109] libc: Tunables broken on big-endian
2339 [21112] math: powf has large ulp errors with base close to 1 and exponent
2341 [21115] network: sunrpc: Use-after-free in error path in clntudp_call
2343 [21120] malloc: glibc malloc is incompatible with GCC 7
2344 [21130] math: Incorrect return from y0l (-inf) and y1l (-inf) when linking
2346 [21134] math: Exception (divide by zero) not set for y0/y1 (0.0) and y0/y1
2347 (-0.0) when linking with -lieee
2348 [21171] math: log10, log2 and lgamma return incorrect results
2349 [21179] libc: handle R_SPARC_DISP64 and R_SPARC_REGISTER relocs
2350 [21182] libc: __memchr_sse2: regression in glibc-2.25 on i686
2351 [21207] localedata: ce_RU: update weekdays from CLDR
2352 [21209] dynamic-link: LD_HWCAP_MASK read in setuid binaries
2353 [21217] localedata: Update months from CLDR-31
2354 [21232] libc: miss posix_fadvise64 on MIPS64 when static linking
2355 [21243] libc: support_delete_temp_file should issue warning for failed
2357 [21244] libc: support resolv_test_start() socket fd close should be
2359 [21253] libc: localedef randomly segfaults when using -fstack-check due to
2360 new posix_spawn implementation
2361 [21258] dynamic-link: Branch predication in _dl_runtime_resolve_avx512_opt
2362 leads to lower CPU frequency
2363 [21259] libc: [alpha] termios.h missing IXANY for POSIX
2364 [21261] libc: [sparc64] bits/setjmp.h namespace
2365 [21267] network: [mips] bits/socket.h IOC* namespace
2366 [21268] libc: [alpha] termios.h NL2, NL3 namespace
2367 [21270] libc: mmap64 silently truncates large offset values
2368 [21275] libc: posix_spawn always crashes on ia64 now
2369 [21277] libc: [alpha] termios.h missing IUCLC for UNIX98 and older
2370 [21280] math: [powerpc] logbl for POWER7 return incorrect results
2371 [21289] libc: Incorrect declaration for 32-bit platforms with
2372 _FILE_OFFSET_BITS=64 causes build error
2373 [21295] network: GETAI(AF_UNSPEC) drops IPv6 addresses if nss module does
2374 not support gethostbyname4_r
2375 [21298] nptl: rwlock can deadlock on frequent reader/writer phase
2377 [21338] malloc: mallopt M_ARENA_MAX doesn't set the maximum number of
2379 [21340] libc: Support POSIX_SPAWN_SETSID
2380 [21357] libc: unwind-dw2-fde deadlock when using AddressSanitizer
2381 [21359] network: ns_name_pack needs additional byte in destination buffer
2382 [21361] network: resolv: Reduce advertised EDNS0 buffer size to guard
2383 against fragmentation attacks (CVE-2017-12132)
2384 [21369] network: resolv: Remove EDNS fallback
2385 [21371] libc: Missing timespec definition when compiled with _XOPEN_SOURCE
2387 [21386] nptl: Assertion in fork for distinct parent PID is incorrect
2388 [21391] dynamic-link: x86: Set dl_platform and dl_hwcap from CPU features
2389 [21393] stdio: Missing dup3 error check in freopen, freopen64
2390 [21396] libc: Use AVX2 memcpy/memset on Skylake server
2391 [21399] localedata: Bad description for U00EC in
2392 localedata/charmaps/CP1254
2393 [21411] malloc: realloc documentation error
2394 [21426] network: sys/socket.h uio.h namespace
2395 [21428] libc: [aarch64] tst-backtrace5 testsuite failure
2396 [21445] libc: signal.h bsd_signal namespace
2397 [21455] network: Network headers stdint.h namespace
2398 [21474] network: resolv: res_init does not use RES_DFLRETRY (2) but 4 for
2400 [21475] network: resolv: Overlong search path is truncated mid-label
2401 [21511] libc: sigstack namespace
2402 [21512] libc: clone() ends up calling exit_group() through _exit() wrapper
2403 [21514] libc: sysdeps/unix/sysv/linux/sys/syscall.h:31:27: fatal error:
2404 bits/syscall.h: No such file or directory
2405 [21517] libc: struct sigaltstack namespace
2406 [21528] dynamic-link: Duplicated minimal strtoul implementations in ld.so
2407 [21533] localedata: Update locale data to Unicode 10.0
2409 ../sysdeps/unix/sysv/linux/s390/s390-32/__makecontext_ret.S:44: Error:
2410 junk at end of line, first unrecognized character is `@'
2411 [21538] libc: SIG_HOLD missing for XPG4
2412 [21539] libc: S390: Mismatch between kernel and glibc ptrace.h with
2413 request 12: PTRACE_SINGLEBLOCK vs PTRACE_GETREGS.
2414 [21542] libc: Use conservative default for sysconf (_SC_NPROCESSORS_ONLN)
2415 [21543] libc: sigevent namespace
2416 [21548] libc: [mips] get/set/make/swap context for MIPS O32 assume wrong
2417 size for general purpose registers in mcontext_t structure
2418 [21550] libc: sigwait namespace
2419 [21552] libc: XPG4 bsd_signal namespace
2420 [21554] libc: sigpause namespace
2421 [21560] libc: sys/wait.h signal.h namespace
2422 [21561] libc: waitid namespace
2423 [21573] nptl: GCC 7: /usr/bin/install: cannot remove
2424 '/usr/include/stdlib.h': Permission denied
2425 [21575] libc: sys/wait.h missing struct rusage definition
2426 [21584] libc: sigaltstack etc namespace
2427 [21597] libc: siginterrupt namespace
2428 [21607] math: hppa: FAIL: math/test-tgmath
2429 [21609] dynamic-link: Incomplete workaround for GCC __tls_get_addr ABI
2431 [21622] libc: [tile] missing SA_* for POSIX.1:2008
2432 [21624] dynamic-link: ld.so: Unsafe alloca allows local attackers to alias
2433 stack and heap (CVE-2017-1000366)
2434 [21625] libc: wait3 namespace
2435 [21654] nss: Incorrect pointer alignment in NSS group merge result
2437 [21657] network: Parse interface zone id for node-local multicast
2438 [21662] string: memcmp-avx2-movbe.S lacks saturating subtraction for
2440 [21666] libc: .symver is used on common symbol
2441 [21668] network: resolv: res_init cross-thread broadcast introduces race
2443 [21687] math: tgmath.h totalorder, totalordermag return type
2444 [21694] locale: Current Glibc Locale Does Not Support Tok-Pisin and Fiji
2446 [21696] libc: Incorrect assumption of of __cpu_mask in
2447 posix/sched_cpucount.c
2448 [21697] libc: sysdeps/posix/spawni.c: 2 * suspicious condition ?
2449 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
2451 [21707] math: ppc64le: Invalid IFUNC resolver from libgcc calls getauxval,
2452 leading to relocation crash
2453 [21709] libc: resolv_conf.c:552: update_from_conf: Assertion
2454 `resolv_conf_matches (resp, conf)' failed.
2455 [21710] localedata: Added Samoan language locale for Samoa
2456 [21711] localedata: Pashto yesstr/nostr locale are missing
2457 [21715] nptl: sysdeps/nptl/bits/pthreadtypes.h: typedef guard
2458 __have_pthread_attr_t can cause redefinition of typedef ‘pthread_attr_t’
2459 [21721] localedata: Incorrect Full Weekday names for ks_IN@devanagari
2460 [21723] localedata: yesstr/nostr missing for Chinese language locale
2461 [21724] localedata: yesstr and nostr are missing for Xhosa [LC_MESSAGES]
2463 [21727] localedata: yesstr and nostr are missing for Tsonga [LC_MESSAGES]
2465 [21728] localedata: New Locale for Tongan language
2466 [21729] localedata: incorrect LC_NAME fields for hi_IN
2467 [21733] localedata: yesstr and nostr are missing for zh_HK
2468 [21734] localedata: Missing yesstr and nostr are for kw_GB
2469 [21738] libc: misc/tst-preadvwritev2 and misc/tst-preadvwritev64v2 fail
2470 [21741] libc: Undefined __memmove_chk_XXX and __memset_chk_XXX in libc.a
2471 [21742] libc: _dl_num_cache_relocations is undefined in libc.a
2472 [21743] localedata: ks_IN@devanagari: abday strings mismatch the day
2474 [21744] libc: Tests failing on --enable-tunables --enable-stack-
2476 [21749] localedata: Wrong abbreviated day name (“abday”) for
2478 [21756] localedata: missing yesstr, nostr for nds_DE and nds_NL
2479 [21757] localedata: missing yesstr, nostr for pap_AW and pap_CW
2480 [21759] localedata: missing yesstr and nostr for Tigrinya
2481 [21760] localedata: Fix LC_MESSAGES and LC_ADDRESS for anp_IN
2482 [21766] localedata: Wrong LC_MESSAGES for om_ET Locale
2483 [21767] localedata: Missing Bislama locales
2484 [21768] localedata: Missing yesstr and nostr for aa_ET
2485 [21770] localedata: Missing Field in li_NL
2486 [21778] nptl: Robust mutex may deadlock
2487 [21779] libc: MicroBlaze segfaults when loading libpthread
2488 [21783] localedata: Fix int_select international_call_prefixes
2489 [21784] localedata: Inconsistency in country_isbn
2490 [21788] localedata: Missing Country Postal Abbreviations
2491 [21794] localedata: Added-country_isbn-for-Italy
2492 [21795] localedata: Add/Fix country_isbn for France
2493 [21796] localedata: Added country_isbn for Republic of Korea
2494 [21797] localedata: Fix inconsistency in country_isbn and missing prefixes
2495 [21799] localedata: Added int_select international_call_prefixes
2496 [21801] localedata: Added int_select international_call_prefixes
2497 [21804] nptl: Double semicolon in thread-shared-types.h
2498 [21807] localedata: LC_ADDRESS fix for pap_CW
2499 [21808] localedata: Fix LC_ADDRESS for pap_AW
2500 [21821] localedata: Added country_name in mai_IN
2501 [21822] localedata: Fix LC_TIME for mai_IN
2502 [21823] localedata: missing yesstr, nostr for sa_IN
2503 [21825] localedata: Fix name_mrs for mag_IN
2504 [21828] localedata: 2.26 changelog should mention user visible changes
2506 [21835] localedata: Added Maithili language locale for Nepal
2507 [21838] localedata: Removed redundant data for the_NP
2508 [21839] localedata: Fix LC_MONETARY for ta_LK
2509 [21844] localedata: Fix Latin characters and Months Sequence.
2510 [21848] localedata: Fix mai_NP Title Name
2515 * The feature test macro __STDC_WANT_LIB_EXT2__, from ISO/IEC TR
2516 24731-2:2010, is supported to enable declarations of functions from that
2517 TR. Note that not all functions from that TR are supported by the GNU C
2520 * The feature test macro __STDC_WANT_IEC_60559_BFP_EXT__, from ISO/IEC TS
2521 18661-1:2014, is supported to enable declarations of functions and macros
2522 from that TS. Note that not all features from that TS are supported by
2525 * The feature test macro __STDC_WANT_IEC_60559_FUNCS_EXT__, from ISO/IEC TS
2526 18661-4:2015, is supported to enable declarations of functions and macros
2527 from that TS. Note that most features from that TS are not supported by
2530 * The nonstandard feature selection macros _REENTRANT and _THREAD_SAFE are
2531 now treated as compatibility synonyms for _POSIX_C_SOURCE=199506L.
2532 Since the GNU C Library defaults to a much newer revision of POSIX, this
2533 will only affect programs that specifically request an old conformance
2534 mode. For instance, a program compiled with -std=c89 -D_REENTRANT will
2535 see a change in the visible declarations, but a program compiled with
2536 just -D_REENTRANT, or -std=c99 -D_POSIX_C_SOURCE=200809L -D_REENTRANT,
2539 Some C libraries once required _REENTRANT and/or _THREAD_SAFE to be
2540 defined by all multithreaded code, but glibc has not required this for
2543 * The inclusion of <sys/sysmacros.h> by <sys/types.h> is deprecated. This
2544 means that in a future release, the macros “major”, “minor”, and “makedev”
2545 will only be available from <sys/sysmacros.h>.
2547 These macros are not part of POSIX nor XSI, and their names frequently
2548 collide with user code; see for instance glibc bug 19239 and Red Hat bug
2549 130601. <stdlib.h> includes <sys/types.h> under _GNU_SOURCE, and C++ code
2550 presently cannot avoid being compiled under _GNU_SOURCE, exacerbating the
2553 * New <fenv.h> features from TS 18661-1:2014 are added to libm: the
2554 fesetexcept, fetestexceptflag, fegetmode and fesetmode functions, the
2555 femode_t type and the FE_DFL_MODE and FE_SNANS_ALWAYS_SIGNAL macros.
2557 * Integer width macros from TS 18661-1:2014 are added to <limits.h>:
2558 CHAR_WIDTH, SCHAR_WIDTH, UCHAR_WIDTH, SHRT_WIDTH, USHRT_WIDTH, INT_WIDTH,
2559 UINT_WIDTH, LONG_WIDTH, ULONG_WIDTH, LLONG_WIDTH, ULLONG_WIDTH; and to
2560 <stdint.h>: INT8_WIDTH, UINT8_WIDTH, INT16_WIDTH, UINT16_WIDTH,
2561 INT32_WIDTH, UINT32_WIDTH, INT64_WIDTH, UINT64_WIDTH, INT_LEAST8_WIDTH,
2562 UINT_LEAST8_WIDTH, INT_LEAST16_WIDTH, UINT_LEAST16_WIDTH,
2563 INT_LEAST32_WIDTH, UINT_LEAST32_WIDTH, INT_LEAST64_WIDTH,
2564 UINT_LEAST64_WIDTH, INT_FAST8_WIDTH, UINT_FAST8_WIDTH, INT_FAST16_WIDTH,
2565 UINT_FAST16_WIDTH, INT_FAST32_WIDTH, UINT_FAST32_WIDTH, INT_FAST64_WIDTH,
2566 UINT_FAST64_WIDTH, INTPTR_WIDTH, UINTPTR_WIDTH, INTMAX_WIDTH,
2567 UINTMAX_WIDTH, PTRDIFF_WIDTH, SIG_ATOMIC_WIDTH, SIZE_WIDTH, WCHAR_WIDTH,
2570 * New <math.h> features are added from TS 18661-1:2014:
2572 - Signaling NaN macros: SNANF, SNAN, SNANL.
2574 - Nearest integer functions: roundeven, roundevenf, roundevenl, fromfp,
2575 fromfpf, fromfpl, ufromfp, ufromfpf, ufromfpl, fromfpx, fromfpxf,
2576 fromfpxl, ufromfpx, ufromfpxf, ufromfpxl.
2578 - llogb functions: the llogb, llogbf and llogbl functions, and the
2579 FP_LLOGB0 and FP_LLOGBNAN macros.
2581 - Max-min magnitude functions: fmaxmag, fmaxmagf, fmaxmagl, fminmag,
2584 - Comparison macros: iseqsig.
2586 - Classification macros: iscanonical, issubnormal, iszero.
2588 - Total order functions: totalorder, totalorderf, totalorderl,
2589 totalordermag, totalordermagf, totalordermagl.
2591 - Canonicalize functions: canonicalize, canonicalizef, canonicalizel.
2593 - NaN functions: getpayload, getpayloadf, getpayloadl, setpayload,
2594 setpayloadf, setpayloadl, setpayloadsig, setpayloadsigf, setpayloadsigl.
2596 * The functions strfromd, strfromf, and strfroml, from ISO/IEC TS 18661-1:2014,
2597 are added to libc. They convert a floating-point number into string.
2599 * Most of glibc can now be built with the stack smashing protector enabled.
2600 It is recommended to build glibc with --enable-stack-protector=strong.
2601 Implemented by Nick Alcock (Oracle).
2603 * The function explicit_bzero, from OpenBSD, has been added to libc. It is
2604 intended to be used instead of memset() to erase sensitive data after use;
2605 the compiler will not optimize out calls to explicit_bzero even if they
2606 are "unnecessary" (in the sense that no _correct_ program can observe the
2607 effects of the memory clear).
2609 * On ColdFire, MicroBlaze, Nios II and SH3, the float_t type is now defined
2610 to float instead of double. This does not affect the ABI of any libraries
2611 that are part of the GNU C Library, but may affect the ABI of other
2612 libraries that use this type in their interfaces.
2614 * On x86_64, when compiling with -mfpmath=387 or -mfpmath=sse+387, the
2615 float_t and double_t types are now defined to long double instead of float
2616 and double. These options are not the default, and this does not affect
2617 the ABI of any libraries that are part of the GNU C Library, but it may
2618 affect the ABI of other libraries that use this type in their interfaces,
2619 if they are compiled or used with those options.
2621 * The getentropy and getrandom functions, and the <sys/random.h> header file
2624 * The buffer size for byte-oriented stdio streams is now limited to 8192
2625 bytes by default. Previously, on Linux, the default buffer size on most
2626 file systems was 4096 bytes (and thus remains unchanged), except on
2627 network file systems, where the buffer size was unpredictable and could be
2628 as large as several megabytes.
2630 * The <sys/quota.h> header now includes the <linux/quota.h> header. Support
2631 for the Linux quota interface which predates kernel version 2.4.22 has
2634 * The malloc_get_state and malloc_set_state functions have been removed.
2635 Already-existing binaries that dynamically link to these functions will
2636 get a hidden implementation in which malloc_get_state is a stub. As far
2637 as we know, these functions are used only by GNU Emacs and this change
2638 will not adversely affect already-built Emacs executables. Any undumped
2639 Emacs executables, which normally exist only during an Emacs build, should
2640 be rebuilt by re-running “./configure; make” in the Emacs build tree.
2642 * The “ip6-dotint” and “no-ip6-dotint” resolver options, and the
2643 corresponding RES_NOIP6DOTINT flag from <resolv.h> have been removed.
2644 “no-ip6-dotint” had already been the default, and support for the
2645 “ip6-dotint” option was removed from the Internet in 2006.
2647 * The "ip6-bytestring" resolver option and the corresponding RES_USEBSTRING
2648 flag from <resolv.h> have been removed. The option relied on a
2649 backwards-incompatible DNS extension which was never deployed on the
2652 * The flags RES_AAONLY, RES_PRIMARY, RES_NOCHECKNAME, RES_KEEPTSIG,
2653 RES_BLAST defined in the <resolv.h> header file have been deprecated.
2654 They were already unimplemented.
2656 * The "inet6" option in /etc/resolv.conf and the RES_USE_INET6 flag for
2657 _res.flags are deprecated. The flag was standardized in RFC 2133, but
2658 removed again from the IETF name lookup interface specification in RFC
2659 2553. Applications should use getaddrinfo instead.
2661 * DNSSEC-related declarations and definitions have been removed from the
2662 <arpa/nameser.h> header file, and libresolv will no longer attempt to
2663 decode the data part of DNSSEC record types. Previous versions of glibc
2664 only implemented minimal support for the previous version of DNSSEC, which
2665 is incompatible with the currently deployed version.
2667 * The resource record type classification macros ns_t_qt_p, ns_t_mrr_p,
2668 ns_t_rr_p, ns_t_udp_p, ns_t_xfr_p have been removed from the
2669 <arpa/nameser.h> header file because the distinction between RR types and
2670 meta-RR types is not officially standardized, subject to revision, and
2671 thus not suitable for encoding in a macro.
2673 * The types res_sendhookact, res_send_qhook, re_send_rhook, and the qhook
2674 and rhook members of the res_state type in <resolv.h> have been removed.
2675 The glibc stub resolver did not support these hooks, but the header file
2676 did not reflect that.
2678 * For multi-arch support it is recommended to use a GCC which has
2679 been built with support for GNU indirect functions. This ensures
2680 that correct debugging information is generated for functions
2681 selected by IFUNC resolvers. This support can either be enabled by
2682 configuring GCC with '--enable-gnu-indirect-function', or by
2683 enabling it by default by setting 'default_gnu_indirect_function'
2684 variable for a particular architecture in the GCC source file
2687 * GDB pretty printers have been added for mutex and condition variable
2688 structures in POSIX Threads. When installed and loaded in gdb these pretty
2689 printers show various pthread variables in human-readable form when read
2690 using the 'print' or 'display' commands in gdb.
2692 * Tunables feature added to allow tweaking of the runtime for an application
2693 program. This feature can be enabled with the '--enable-tunables' configure
2694 flag. The GNU C Library manual has details on usage and README.tunables has
2695 instructions on adding new tunables to the library.
2697 * A new version of condition variables functions have been implemented in
2698 the NPTL implementation of POSIX Threads to provide stronger ordering
2701 * A new version of pthread_rwlock functions have been implemented to use a more
2702 scalable algorithm primarily through not using a critical section anymore to
2705 Security related changes:
2707 * On ARM EABI (32-bit), generating a backtrace for execution contexts which
2708 have been created with makecontext could fail to terminate due to a
2709 missing .cantunwind annotation. This has been observed to lead to a hang
2710 (denial of service) in some Go applications compiled with gccgo. Reported
2711 by Andreas Schwab. (CVE-2016-6323)
2713 * The DNS stub resolver functions would crash due to a NULL pointer
2714 dereference when processing a query with a valid DNS question type which
2715 was used internally in the implementation. The stub resolver now uses a
2716 question type which is outside the range of valid question type values.
2719 The following bugs are resolved with this release:
2721 [4099] stdio: Overly aggressive caching by stream i/o functions.
2722 [7065] build: Support building glibc with -fstack-protector or -fstack-
2724 [9842] localedata: en_CA: incorrect date format
2725 [13165] nptl: pthread_cond_wait() can consume a signal that was sent
2726 before it started waiting
2727 [14139] manual: Do not hardcode platform names in manual/libm-err-tab.pl
2728 [15765] nptl: sem_open is wrongly a cancellation point
2729 [16421] network: IN6_IS_ADDR_UNSPECIFIED can use undefined s6_addr32
2730 [16458] libc: endian.h and netinet/in.h byte order macros return values of
2732 [16628] dynamic-link: Segfault after a binary without pthread dlopen()s a
2733 library linked with pthread
2734 [16630] nptl: Use SYSENTER for pthread_cond_broadcast/signal() (i.e. fix
2735 "FIXME: Ingo" issue)
2736 [16907] libc: <argp.h> compiled with --std=cXX disables __attribute__
2737 [17252] libc: getrandom and getentropy syscall
2738 [17730] malloc: thread-local storage is sometimes improperly free()'d
2739 after being __libc_memalign()'d
2740 [18241] stdio: failed fseek on memstream does not set errno and can fail
2742 [18243] nptl: sem_wait, sem_timedwait are cancellation points shm_open is
2744 [18463] nptl: pthread_cond_broadcast issue when surrounded by
2745 PTHREAD_PRIO_INHERIT mutex on ARM
2746 [18784] network: res_query and related function crash for special record
2747 type queries (CVE-2015-5180)
2748 [19380] math: strtod does not raise "inexact"
2749 [19387] string: Integer overflow in memchr
2750 [19390] string: Integer overflow in strncat
2751 [19398] build: linknamespace tests fail with massively parallel build
2752 [19402] nptl: Deadlock with robust shared mutex and asynchronous
2754 [19469] malloc: M_PERTURB in test-skeleton.c invalidates malloc tests
2755 [19473] malloc: Turn malloc_get_state etc. in compatibility symbols
2756 [19514] libc: [PATCH] Fix spelling errors in spelling
2757 "implement"/"implementation" in several places
2758 [19582] network: Deprecate RES_USE_INET6
2759 [19673] manual: clog10 docs appear to be erroneous
2760 [19810] dynamic-link: dlopen with both RTLD_NOLOAD and RTLD_NODELETE
2761 causes a segmentation fault
2762 [19826] libc: invalid pointer returned from __tls_get_addr with static
2764 [20016] network: resolv: Remove hooks support from the API
2765 [20019] dynamic-link: NULL pointer dereference in libc.so.6 IFUNC due to
2767 [20033] math: [x86_64] vectorized math function don't call the __finite
2769 [20116] nptl: use after free in pthread_create
2770 [20181] stdio: open_memstream(): writes not at end of stream corrupt data
2771 [20292] dynamic-link: Comparison in elf/dl-open.c _dl_addr_inside_object
2773 [20311] nptl: please install proc_service.h
2774 [20366] libc: Compilation errors in installed headers in strict-compliance
2776 [20370] malloc: malloc: Arena free list management is still racy
2777 (incorrect fix in bug 19243)
2778 [20386] libc: assert (X = 0) does not result in GCC warning
2779 [20432] malloc: malloc: Minimize interface required for interposition
2780 [20435] libc: Missing unwind info in __startcontext causes infinite loop
2781 in _Unwind_Backtrace (CVE-2016-6323)
2782 [20444] hurd: recvmsg: PF_LOCAL sockets and msg_name lead to SIGLOST
2783 [20452] nptl: Addition of sysdep.o to libpthread.a breaks relinking
2785 [20455] math: [powerpc] fesetexceptflag fails to clear FE_INVALID
2786 [20459] localedata: et_EE: locale has wrong {p,n}_cs_precedes value
2787 [20477] network: resolv: incorrect double-checked locking related to
2789 [20478] libc: libc_ifunc macro and similar usages leads to false debug-
2791 [20495] math: x86_64 performance degradation due to AVX/SSE transition
2793 [20497] localedata: lt_LT: LC_TIME d_fmt used is obsolete
2794 [20508] dynamic-link: _dl_runtime_resolve_avx/_dl_runtime_profile_avx512
2795 cause transition penalty
2796 [20517] math: sparcv9 missing fdiml compat symbol
2797 [20524] manual: strverscmp is inconsistent
2798 [20525] libc: <sys/quota.h> should be based on kernel headers
2799 [20539] math: GCC 7 -static -lm fails to link at -O3
2800 [20554] libc: ld: bss-plt forced due to /usr/lib/libc_nonshared.a(ppc-
2802 [20558] string: POSIX bcopy/bzero decls do not implement Object Size
2804 [20591] network: Remove obsolete DNSSEC support
2805 [20592] network: DNS resource record type classification macros in
2806 <arpa/nameser.h> are incorrect
2807 [20593] network: Update DNS RR type definitions
2808 [20611] network: getaddrinfo accepts invalid numeric scope IDs
2809 [20615] build: glibc build fails when using --with-cpu=power9 --enable-
2811 [20629] network: libresolv: Remove support for bitstring labels
2813 [20647] libc: GLIBC quitting every program - glibc on Pentium-S leads to
2814 assertion: "maxidx >= 2"
2815 [20660] math: [arm] Use VSQRT
2816 [20662] libc: checking whether x86_64-pc-linux-gnu-gcc implicitly enables
2817 -fstack-protector no (32bit gcc 6.2.0 pie and ssp enable)
2818 [20689] libc: Test for FMA should also check for AVX.
2819 [20707] glob: gl_pathv entries not set to NULL with GLOB_DOOFFS
2820 [20715] math: iszero macro breaks existing code
2821 [20718] math: [powerpc] copysignl raises "invalid" for sNaN
2822 [20728] libc: powerpc: Missing TOC stub in clone
2823 [20729] build: glibc-2.24 fails to build for i486 with -Os
2824 [20750] build: Build fails with default PIE enabled gcc-6.x
2825 [20768] math: [alpha] sqrt fegetenv namespace
2826 [20785] libc: binutils 2.28 fails to assemble power6/memset.S file in
2828 [20787] math: float_t is defined as float incorrectly on x86_64 even if
2829 __FLT_EVAL_METHOD__ is 2
2830 [20790] network: rpcgen buffer overrun in get_prog_declaration
2831 [20822] nptl: race condition in __lll_unlock_elision on powerpc
2832 [20829] libc: crypt snprintf namespace
2833 [20847] libc: tst-vfork3 failure
2834 [20855] math: Default bits/mathdef.h has inappropriate float_t
2835 [20859] math: [sh4] FP_ILOGB0 invalid
2836 [20864] localedata: iconv: cp936 missing single-byte euro sign (0x80,
2837 U+20AC), not same as GBK
2838 [20915] dynamic-link: global-dynamic TLS broken on aarch64
2839 [20916] math: pow handling of sNaN arguments
2840 [20918] build: Building with --enable-nss-crypt fails tst-linkall-static.
2841 [20919] math: Bad pow (qNaN, 0) result with -lieee
2842 [20940] math: hypot sNaN handling
2843 [20947] math: fmax, fmin sNaN handling
2844 [20956] libc: debug/tst-backtrace3-6 don't work with -O3 anymore
2845 [20964] network: sunrpc: Stack-based buffer overflow in getrpcport with
2847 [20971] string: powerpc64/power7 memchr overflows internal pointer check
2848 [20973] nptl: robust mutexes: Lost wake-ups
2849 [20974] locale: bs_BA: yesexpr/noexpr regexes accept any character
2850 [20978] nis: strlen on null pointer in nss_nisplus
2851 [20985] nptl: robust mutexes: lowlevelrobustlock assembly on x86 blocks on
2853 [21014] string: i686 memchr overflows internal pointer check
2854 [21019] libc: [mips] n32 lseek incorrect on overflow
2855 [21022] libc: [microblaze] __backtrace get_frame_size namespace
2856 [21026] libc: [MIPS] readahead syscall is broken on n64
2857 [21028] math: Fallback fesetexceptflag should always succeed
2858 [21045] libc: [powerpc-nofpu] swapcontext does not restore signal mask
2859 [21047] math: arm: fpu_control.h: _FPU_GETCW/_FPU_SETCW is rejected by
2861 [21053] libc: [SH] Namespace pollution from sys/ucontext.h
2862 [21061] librt: [microblaze] librt lost clock_* exports
2863 [21073] libc: tunables: insecure environment variables passed to
2864 subprocesses with AT_SECURE
2865 [21081] string: Missing vzeroupper in memset-vec-unaligned-erms.S
2869 * The minimum Linux kernel version that this version of the GNU C Library
2870 can be used with is 3.2, except on i[4567]86 and x86_64, where Linux
2871 kernel version 2.6.32 or later suffices (on architectures that already
2872 required kernel versions more recent than 3.2, those requirements remain
2873 unchanged). Linux 3.2 or later kernel headers are required on all
2876 * The pap_AN locale has been deleted. This has been deprecated for a long
2877 time. It has been replaced by pap_AW & pap_CW, both of which have long
2878 been included in previous releases.
2880 * The readdir_r and readdir64_r functions have been deprecated. It is
2881 recommended to use readdir and readdir64 instead.
2883 * The type “union wait” has been removed. It was deprecated in the early
2884 1990s and never part of POSIX. Application code should use the int type
2885 instead of “union wait”.
2887 * A new NSS action is added to facilitate large distributed system
2888 administration. The action, MERGE, allows remote user stores like LDAP
2889 to be merged into local user stores like /etc/groups in order to provide
2890 easy to use, updated, and managed sets of merged credentials. The new
2891 action can be used by configuring it in /etc/nsswitch.conf:
2892 group: files [SUCCESS=merge] nis
2893 Implemented by Stephen Gallagher (Red Hat).
2895 * The deprecated __malloc_initialize_hook variable has been removed from the
2898 * The long unused localedef --old-style option has been removed. It hasn't
2899 done anything in over 16 years. Scripts using this option can safely
2902 * nextupl, nextup, nextupf, nextdownl, nextdown and nextdownf are added to
2903 libm. They are defined by TS 18661 and IEEE754-2008. The nextup functions
2904 return the next representable value in the direction of positive infinity
2905 and the nextdown functions return the next representable value in the
2906 direction of negative infinity. These are currently enabled as GNU
2909 Security related changes:
2911 * An unnecessary stack copy in _nss_dns_getnetbyname_r was removed. It
2912 could result in a stack overflow when getnetbyname was called with an
2913 overly long name. (CVE-2016-3075)
2915 * Previously, getaddrinfo copied large amounts of address data to the stack,
2916 even after the fix for CVE-2013-4458 has been applied, potentially
2917 resulting in a stack overflow. getaddrinfo now uses a heap allocation
2918 instead. Reported by Michael Petlan. (CVE-2016-3706)
2920 * The glob function suffered from a stack-based buffer overflow when it was
2921 called with the GLOB_ALTDIRFUNC flag and encountered a long file name.
2922 Reported by Alexander Cherepanov. (CVE-2016-1234)
2924 * The Sun RPC UDP client could exhaust all available stack space when
2925 flooded with crafted ICMP and UDP messages. Reported by Aldy Hernandez'
2926 alloca plugin for GCC. (CVE-2016-4429)
2928 * The IPv6 name server management code in libresolv could result in a memory
2929 leak for each thread which is created, performs a failing naming lookup,
2930 and exits. Over time, this could result in a denial of service due to
2931 memory exhaustion. Reported by Matthias Schiffer. (CVE-2016-5417)
2933 The following bugs are resolved with this release:
2935 [1170] localedata: ne_NP: update Nepali locale definition file
2936 [3629] manual: stpcpy description in string.texi refers to MS-DOG instead
2938 [6527] malloc: [powerpc] Malloc alignment insufficient for PowerPC
2939 [6796] math: fdim() does not set errno on overflow
2940 [10354] libc: posix_spawn should use vfork() in more cases than presently
2941 [11213] localedata: localedata: add copyright disclaimer to locale files
2942 [12143] localedata: chr_US: new Cherokee locale
2943 [12450] localedata: sgs_LT: new locale
2944 [12676] localedata: ln_CD: new locale
2945 [13237] localedata: LC_ADDRESS.country_name: update all locales w/latest
2947 [13304] math: fma, fmaf, fmal produce wrong results
2948 [14259] build: --localedir arg to configure is ignored
2949 [14499] nptl: Does posix_spawn invoke atfork handlers / use vfork?
2950 [14750] libc: Race condition in posix_spawn vfork usage vs signal handlers
2951 [14934] localedata: es_CL: wrong first weekday chilean locale
2952 [15262] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of
2954 [15263] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of 1/0
2956 [15264] localedata: LC_MESSAGES.yesstr/nostr: lacking in many locales
2957 [15368] nptl: raise() is not async-signal-safe
2958 [15479] math: ceil, floor, round and trunc raise inexact exception
2959 [15578] localedata: kk_KZ: various updates
2960 [16003] localedata: pap_AN: punt old locale
2961 [16137] localedata: iw_IL: punt old locale
2962 [16190] localedata: eo: new esperanto locale
2963 [16374] localedata: lv_LV: change currency symbol in LC_MONETARY to euro
2964 [16742] malloc: race condition: pthread_atfork() called before first
2965 malloc() results in unexpected locking behaviour/deadlocks
2966 [16975] localedata: LC_MESSAGES.yesexpr/noexpr: revisit capitalization in
2968 [16983] localedata: postal_fmt does not allow %l and %n modifiers
2969 [17565] localedata: pt_PT: wrong (work-)week start
2970 [17899] math: [powerpc] floorl returns negative zero with FE_DOWNWARD
2971 [17950] build: Build fails with -msse
2972 [18205] localedata: be_BY*: wrong first_weekday and first_workday
2973 [18433] libc: posix_spawn does not return correctly upon failure to
2975 [18453] localedata: charmaps/IBM875: incorrect codes
2976 [18712] string: bits/string2.h incompatible with -O2 -Werror=packed
2978 [18896] localedata: he_IL: improvements for currency
2979 [18911] localedata: ro_RO: Correcting week day name for "Tuesday" in
2980 Romanian locale data
2981 [18960] locale: s390: _nl_locale_subfreeres uses larl opcode on misaligned
2983 [19056] libc: Deprecate readdir_r
2984 [19133] localedata: pt_*: days & months should be lowercase in Portuguese
2986 [19198] localedata: nl_NL: small improvements for Dutch locales
2987 [19257] network: Per-thread memory leak in __res_vinit with IPv6
2988 nameservers (CVE-2016-5417)
2989 [19269] build: tst-audit4 and tst-audit10 failures with gcc-6 on non avx
2991 [19400] locale: Language missing in "iso-639.def", trivial fix in
2993 [19431] malloc: Deadlock between fflush, getdelim, and fork
2994 [19505] libc: Incorrect file descriptor validity checks in
2995 posix_spawn_file_actions_add{open,close,dup2}
2996 [19509] dynamic-link: dlsym, dlvsym do not report errors through dlerror
2997 when using RTLD_NEXT
2998 [19512] locale: Stale `#ifndef HAVE_BUILTIN_EXPECT' in
2999 `intl/{gettextP,loadinfo}.h'
3000 [19534] libc: execle, execlp may use malloc
3001 [19568] localedata: *_CH: Swiss locales have inconsistent start of week
3002 [19573] network: res_nclose and __res_maybe_init disagree about name
3003 server initialization, breaking Hesiod
3004 [19575] localedata: Status of GB18030 tables
3005 [19581] localedata: sr_* date_fmt string contains additional newline
3006 [19583] string: SSSE3_Fast_Copy_Backward flag needs to be enabled for AMD
3008 [19592] math: [ldbl-128ibm] ceill incorrect in non-default rounding modes
3009 [19593] math: [ldbl-128ibm] truncl incorrect in non-default rounding modes
3010 [19594] math: [ldbl-128ibm] roundl incorrect in non-default rounding modes
3011 [19595] math: [ldbl-128ibm] fmodl incorrect for results in subnormal
3013 [19602] math: [ldbl-128ibm] fmodl handling of equal arguments with low
3015 [19603] math: [ldbl-128ibm] remainderl, remquol incorrect sign handling in
3017 [19610] dynamic-link: ldconfig -X removes stale symbolic links
3018 [19613] libc: s390x (64 bit) macro expansion WCOREDUMP and others
3019 [19633] locale: strfmon_l applies global locale to number formatting
3020 [19642] network: Memory leak in getnameinfo
3021 [19648] libc: test-skeleton.c: Do not set RLIMIT_DATA
3022 [19653] libc: Potential for NULL pointer dereference (CWE-476) in
3024 [19654] math: [x86_64] Need testcase for BZ #19590 fix
3025 [19671] localedata: Missing Sanity Check for malloc() in 'tst-fmon.c' &
3027 [19674] math: [ldbl-128ibm] powl incorrect overflow handling
3028 [19677] math: [ldbl-128ibm] remainderl equality test incorrect for zero
3030 [19678] math: [ldbl-128ibm] nextafterl, nexttowardl incorrect sign of zero
3032 [19679] dynamic-link: gcc-4.9.3 C++ exception handling broken due to
3034 [19726] locale: Converting UCS4LE to INTERNAL with iconv() does not update
3035 pointers and lengths in error-case.
3036 [19727] locale: Converting from/to UTF-xx with iconv() does not always
3037 report errors on UTF-16 surrogates values.
3038 [19755] nscd: nscd assertion failure in gc
3039 [19758] dynamic-link: Typo in EXTRA_LD_ENVVARS for x86-64
3040 [19759] libc: mempcpy shouldn't be inlined
3041 [19762] dynamic-link: HAS_CPU_FEATURE/HAS_ARCH_FEATURE are easy to misuse
3042 [19765] libc: s390 needs an optimized mempcpy
3043 [19779] glob: glob: buffer overflow with GLOB_ALTDIRFUNC due to incorrect
3044 NAME_MAX limit assumption (CVE-2016-1234)
3045 [19783] build: benchtests don't support --enable-hardcoded-path-in-tests
3046 [19787] network: Missing and incorrect truncation checks in getnameinfo
3047 [19790] math: [ldbl-128ibm] nearbyintl incorrect in non-default rounding
3049 [19791] network: Assertion failure in res_query.c with un-connectable name
3051 [19792] libc: MIPS: backtrace yields infinite backtrace with makecontext
3052 [19822] math: libm.so install clobbers old version
3053 [19825] network: resolv: send_vc can return uninitialized data in second
3054 response to getaddrinfo
3055 [19830] network: nss_dns: should check RDATA length against buffer length
3056 [19831] network: nss_dns: getaddrinfo returns uninitialized data when
3057 confronted with A/AAAA records of invalid size
3058 [19837] nss: nss_db: No retries for some long lines with a larger buffer
3059 [19848] math: powl(10,n) for n=-4,-5,-6,-7 is off by more than 1 ULP
3060 [19853] stdio: Printing IBM long double in decimal with high precision is
3062 [19860] build: x86_64: compile errors for tst-audit10 and tst-auditmod10b
3063 [19861] nptl: libpthread IFUNC resolver for fork can lead to crash
3064 [19862] network: resolv, nss_dns: Remove remaining logging of unexpected
3066 [19865] network: Assertion failure or memory leak in
3067 _nss_dns_getcanonname_r
3068 [19868] network: nss_dns: netent code does not skip over non-PTR records
3069 [19879] network: nss_dns: Stack overflow in getnetbyname implementation
3071 [19881] string: Improve x86-64 memset
3072 [19907] string: Incorrect memcpy tests
3073 [19916] dynamic-link: S390: fprs/vrs are not saved/restored while
3075 [19925] libc: termios.h XCASE namespace
3076 [19928] string: memmove-vec-unaligned-erms.S is slow with large data size
3077 [19929] libc: limits.h NL_NMAX namespace
3078 [19931] stdio: Memory leak in vfprintf
3079 [19957] libc: clone(CLONE_VM) access invalid parent memory
3080 [19963] localedata: en_IL: New locale
3081 [19989] stdio: stdio.h cuserid namespace
3082 [19994] network: getaddrinfo does not restore RES_USE_INET6 flag in
3084 [19996] locale: langinfo.h nl_langinfo_l namespace
3085 [20005] stdio: fflush on a file opened with fmemopen resets position to 0
3086 [20010] network: getaddrinfo: Stack overflow in hostent translation
3088 [20012] stdio: libio: fmemopen append mode failure
3089 [20014] stdio: stdio.h namespace for pre-threads POSIX
3090 [20017] network: resolv: Use gmtime_r instead of gmtime in p_secstodate
3091 [20023] libc: fcntl.h timespec namespace
3092 [20024] math: [x86_64] vectorized sincos trashes the stack
3093 [20031] network: nss_hesiod: Heap overflow in get_txt_records
3094 [20041] time: sys/time.h timespec namespace
3095 [20043] libc: unistd.h missing cuserid for UNIX98 and before
3096 [20044] libc: unistd.h missing pthread_atfork for UNIX98
3097 [20051] libc: ttyslot in wrong header under wrong conditions
3098 [20054] libc: gethostname not declared for XPG4
3099 [20055] libc: termios.h missing tcgetsid for XPG4
3100 [20072] dynamic-link: x86 init_cpu_features is called twice in static
3102 [20073] libc: sys/stat.h fchmod namespace
3103 [20074] libc: stdlib.h rand_r namespace
3104 [20076] libc: sys/stat.h missing S_IFSOCK, S_ISSOCK for XPG4
3105 [20094] libc: stdlib.h should not declare grantpt, ptsname, unlockpt for
3107 [20111] libc: struct sockaddr_storage cannot be aggregate-copied
3108 [20112] network: sunrpc: stack (frame) overflow in Sun RPC clntudp_call
3110 [20115] string: Extra alignment in memset-vec-unaligned-erms.S
3111 [20119] libc: Wrong mask for processors level type from CPUID
3112 [20139] dynamic-link: Upper part of zmm is zeroed if Glibc is built with
3113 AS not supporting AVX512
3114 [20151] math: [ldbl-128/ldbl-128ibm] j0l, j1l, y0l, y1l return sNaN for
3116 [20153] math: [ldbl-128ibm] sqrtl (sNaN) returns sNaN
3117 [20156] math: [ldbl-128ibm] ceill, rintl etc. return sNaN for sNaN
3119 [20157] math: [powerpc] fabsl (sNaN) wrongly raises "invalid"
3120 [20160] math: [powerpc] ceil, rint etc. return sNaN for sNaN input
3121 [20178] libc: posix_spawn{p} should not call exit
3122 [20191] stdio: libio: vtables hardening
3123 [20195] string: FMA4 detection requires CPUID execution with register
3125 [20198] libc: quick_exit incorrectly destroys C++11 thread objects.
3126 [20205] math: [i386/x86_64] nextafterl incorrect incrementing negative
3128 [20212] math: acos (sNaN) returns sNaN
3129 [20213] math: asin (sNaN) returns sNaN
3130 [20214] network: Linux header sync with linux/in6.h and ipv6.h again.
3131 [20218] math: [i386] asinhl (sNaN) returns sNaN
3132 [20219] math: [i386] atanhl (sNaN) returns sNaN
3133 [20222] stdio: fopencookie: Mangle function pointers
3134 [20224] math: [i386] cbrtl (sNaN) returns sNaN
3135 [20225] math: ldexp, scalbn, scalbln return sNaN for sNaN input
3136 [20226] math: [i386/x86_64] expl, exp10l, expm1l return sNaN for sNaN
3138 [20227] math: [i386/x86_64] logl (sNaN) returns sNaN
3139 [20228] math: [i386/x86_64] log10l (sNaN) returns sNaN
3140 [20229] math: [i386/x86_64] log1pl (sNaN) returns sNaN
3141 [20232] math: [ldbl-128] expm1l (sNaN) returns sNaN
3142 [20233] math: [ldbl-128ibm] expm1l (sNaN) returns sNaN
3143 [20234] math: [ldbl-128ibm] log1pl (sNaN) returns sNaN
3144 [20235] math: [i386/x86_64] log2l (sNaN) returns sNaN
3145 [20237] nss: nss_db: get*ent segfaults without preceding set*ent
3146 [20240] math: modf (sNaN) returns sNaN
3147 [20248] libc: debug/tst-longjump_chk2 calls printf from a signal handler
3148 [20250] math: frexp (sNaN) returns sNaN
3149 [20252] math: atan2 (sNaN, qNaN) fails to raise "invalid"
3150 [20255] math: [i386] fdim, fdimf return with excess range and precision /
3152 [20256] math: [i386/x86_64] fdiml returns sNaN for sNaN input
3153 [20260] string: ../sysdeps/x86/bits/string.h:1092:3: error: array
3154 subscript is below array bounds [-Werror=array-bounds]
3155 [20262] nis: _nss_nis_initgroups_dyn always returns NSS_STATUS_NOTFOUND
3156 [20263] nptl: robust mutex deadlocks if other thread requests timedlock
3158 [20277] libc: $dp is not initialized correctly in sysdeps/hppa/start.S
3159 [20284] malloc: malloc: Corrupt arena avoidance causes unnecessary mmap
3161 [20296] math: [i386/x86_64] scalbl returns sNaN for sNaN input, missing
3162 "invalid" exceptions
3163 [20314] nptl: make[4]: *** [/usr/include/stdlib.h] Error 1
3164 [20316] localedata: id_ID: Februari instead of Pebruari
3165 [20327] string: POWER8 strcasecmp returns incorrect result
3166 [20347] math: Failure: Test: j0_downward (0xap+0)
3167 [20348] libc: FAIL: misc/tst-preadvwritev64
3168 [20349] libc: 64-bit value is passed differently in p{readv,writev}{64}
3169 [20350] libc: There is no test for p{read,write}64
3170 [20357] math: Incorrect cos result for 1.5174239687223976
3171 [20384] build: Don't run libmvec-sincos-avx* tests on non avx machines
3175 * Unicode 8.0.0 Support: Character encoding, character type info, and
3176 transliteration tables are all updated to Unicode 8.0.0, using new
3177 and/or improved generator scripts contributed by Mike FABIAN (Red Hat).
3178 These updates cause user visible changes, such as the fixes for bugs
3179 89, 16061, and 18568.
3181 * sched_setaffinity, pthread_setaffinity_np no longer attempt to guess the
3182 kernel-internal CPU set size. This means that requests that change the
3183 CPU affinity which failed before (for example, an all-ones CPU mask) will
3184 now succeed. Applications that need to determine the effective CPU
3185 affinities need to call sched_getaffinity or pthread_getaffinity_np after
3186 setting it because the kernel can adjust it (and the previous size check
3187 would not detect this in the majority of cases).
3189 * The fts.h header can now be used with -D_FILE_OFFSET_BITS=64. With LFS
3190 the following new symbols are used: fts64_children, fts64_close,
3191 fts64_open, fts64_read and fts64_set.
3193 * getaddrinfo now detects certain invalid responses on an internal netlink
3194 socket. If such responses are received, an affected process will
3195 terminate with an error message of "Unexpected error <number> on netlink
3196 descriptor <number>" or "Unexpected netlink response of size <number> on
3197 descriptor <number>". The most likely cause for these errors is a
3198 multi-threaded application which erroneously closes and reuses the netlink
3199 file descriptor while it is used by getaddrinfo.
3201 * A defect in the malloc implementation, present since glibc 2.15 (2012) or
3202 glibc 2.10 via --enable-experimental-malloc (2009), could result in the
3203 unnecessary serialization of memory allocation requests across threads.
3204 The defect is now corrected. Users should see a substantial increase in
3205 the concurent throughput of allocation requests for applications which
3206 trigger this bug. Affected applications typically create and
3207 destroy threads frequently. (Bug 19048 was reported and analyzed by
3210 * There is now a --disable-timezone-tools configure option for disabling the
3211 building and installing of the timezone related utilities (zic, zdump, and
3212 tzselect). This is useful for people who build the timezone data and code
3213 independent of the GNU C Library.
3215 * The obsolete header <regexp.h> has been removed. Programs that require
3216 this header must be updated to use <regex.h> instead.
3218 * The obsolete functions bdflush, create_module, get_kernel_syms,
3219 query_module and uselib are no longer available to newly linked binaries;
3220 the header <sys/kdaemon.h> has been removed. These functions and header
3221 were specific to systems using the Linux kernel and could not usefully be
3222 used with the GNU C Library on systems with version 2.6 or later of the
3225 * Optimized string, wcsmbs and memory functions for IBM z13.
3226 Implemented by Stefan Liebler.
3228 * Newly linked programs that define a variable called signgam will no longer
3229 have it set by the lgamma, lgammaf and lgammal functions. Programs that
3230 require signgam to be set by those functions must ensure that they use the
3231 variable provided by the GNU C Library and declared in <math.h>, without
3232 defining their own copy.
3234 * The minimum GCC version that can be used to build this version of the GNU
3235 C Library is GCC 4.7. Older GCC versions, and non-GNU compilers, can
3236 still be used to compile programs using the GNU C Library.
3238 Security related changes:
3240 * An out-of-bounds value in a broken-out struct tm argument to strftime no
3241 longer causes a crash. Reported by Adam Nielsen. (CVE-2015-8776)
3243 * The LD_POINTER_GUARD environment variable can no longer be used to disable
3244 the pointer guard feature. It is always enabled. Previously,
3245 LD_POINTER_GUARD could be used to disable security hardening in binaries
3246 running in privileged AT_SECURE mode. Reported by Hector Marco-Gisbert.
3249 * An integer overflow in hcreate and hcreate_r could lead to an
3250 out-of-bounds memory access. Reported by Szabolcs Nagy. (CVE-2015-8778)
3252 * The catopen function no longer has unbounded stack usage. Reported by
3253 Max. (CVE-2015-8779)
3255 * The nan, nanf and nanl functions no longer have unbounded stack usage
3256 depending on the length of the string passed as an argument to the
3257 functions. Reported by Joseph Myers. (CVE-2014-9761)
3259 * A stack-based buffer overflow was found in libresolv when invoked from
3260 libnss_dns, allowing specially crafted DNS responses to seize control
3261 of execution flow in the DNS client. The buffer overflow occurs in
3262 the functions send_dg (send datagram) and send_vc (send TCP) for the
3263 NSS module libnss_dns.so.2 when calling getaddrinfo with AF_UNSPEC
3264 family. The use of AF_UNSPEC triggers the low-level resolver code to
3265 send out two parallel queries for A and AAAA. A mismanagement of the
3266 buffers used for those queries could result in the response of a query
3267 writing beyond the alloca allocated buffer created by
3268 _nss_dns_gethostbyname4_r. Buffer management is simplified to remove
3269 the overflow. Thanks to the Google Security Team and Red Hat for
3270 reporting the security impact of this issue, and Robert Holiday of
3271 Ciena for reporting the related bug 18665. (CVE-2015-7547)
3273 The following bugs are resolved with this release:
3275 [89] localedata: Locales nb_NO and nn_NO should transliterate æøå
3276 [887] math: Math library function "logb" and "nextafter" inconsistent
3277 [2542] math: Incorrect return from float gamma (-0X1.FA471547C2FE5P+1)
3278 [2543] math: Incorrect return from float gamma (-0X1.9260DCP+1)
3279 [2558] math: Incorrect return from double gamma (-0X1.FA471547C2FE5P+1)
3280 [2898] libc: [improve] warning: the use of `mktemp' is dangerous, better
3282 [4404] localedata: German translation of "Alarm clock" is misleading
3283 [6799] math: nextafter() and nexttoward() doen't set errno on
3284 overflow/underflow errors
3285 [6803] math: scalb(), scalbln(), scalbn() do not set errno on
3287 [10432] nis: _nss_nis_setnetgrent assertion failure
3288 [11460] libc: fts has no LFS support
3289 [12926] network: getaddrinfo()/make_request() may spin forever
3290 [13065] nptl: Race condition in pthread barriers
3291 [13690] nptl: pthread_mutex_unlock potentially cause invalid access
3292 [14341] dynamic-link: Dynamic linker crash when DT_JMPREL and DT_REL{,A}
3294 [14551] math: [ldbl-128ibm] strtold overflow handling for IBM long double
3295 [14912] libc: Rename non-installed bits/*.h headers
3296 [15002] libc: Avoid undefined behavior in posix_fallocate overflow check
3297 [15367] math: Let gcc use __builtin_isinf
3298 [15384] math: One constant fewer in ieee754/dbl-64/wordsize-64/s_finite.c
3299 [15421] math: lgamma wrongly sets signgam for ISO C
3300 [15470] math: [arm] On ARM llrintl() and llroundl() do not raise
3301 FE_INVALID with argument out of range
3302 [15491] math: [i386/x86_64] x86 nearbyint implementations wrongly clear
3304 [15786] dynamic-link: ifunc resolver functions can smash function
3306 [15918] math: Unnecessary check for equality in hypotf()
3307 [16061] localedata: Review / update transliteration data
3308 [16068] math: [i386/x86_64] x86 and x86_64 fesetenv exclude state they
3310 [16141] time: strptime %z offset restriction
3311 [16171] math: drem should be alias of remainder
3312 [16296] math: fegetround is pure?
3313 [16347] math: [ldbl-128ibm] ldbl-128/e_lgammal_r.c may not be suitable.
3314 [16364] libc: sleep may leave SIGCHLD blocked on sync cancellation on
3316 [16399] math: [mips] lrint / llrint / lround / llround missing exceptions
3317 [16415] math: Clean up ldbl-128 / ldbl-128ibm expm1l for large positive
3319 [16422] math: [powerpc] math-float, math-double failing llrint tests with
3320 "Exception "Inexact" set" on ppc32
3321 [16495] localedata: nl_NL: date_fmt: shuffle year/month around
3322 [16517] math: Missing underflow exception from tanf/tan/tanl
3323 [16519] math: Missing underflow exception from sinhf
3324 [16520] math: Missing underflow exception from tanhf
3325 [16521] math: Missing underflow exception from exp2
3326 [16620] math: [ldbl-128ibm] exp10l spurious overflows / bad directed
3328 [16734] stdio: fopen calls mmap to allocate its buffer
3329 [16961] math: nan function incorrect handling of bad sequences
3330 [16962] math: nan function unbounded stack allocation (CVE-2014-9761)
3331 [16973] localedata: Fix lang_lib/lang_term as per ISO 639-2
3332 [16985] locale: localedef: confusing error message when opening output
3334 [17118] math: ctanh(INFINITY + 2 * I) returns incorrect value
3335 [17197] locale: Redundant shift character in iconv conversion output at
3337 [17243] libc: trunk/posix/execl.c:53: va_args problem ?
3338 [17244] libc: trunk/sysdeps/unix/sysv/linux/semctl.c:116: va_args muxup ?
3339 [17250] dynamic-link: static linking breaks nss loading
3340 (getaddrinfo/getpwnam/etc...)
3341 [17404] libc: atomic_exchange_rel lacking a barrier on MIPS16, GCC before
3343 [17441] math: isnan() should use __builtin_isnan() in GCC
3344 [17514] nptl: Assert failure unlocking ERRORCHECK mutex after timedlock
3345 (related to lock elision)
3346 [17787] manual: Exponent on page 324 of the PDF ends prematurely
3347 [17886] time: strptime should be able to parse "Z" as a timezone with %z
3348 [17887] time: strptime should be able to parse "+01:00" style timezones
3349 [17905] libc: catopen() Multiple unbounded stack allocations
3351 [18084] libc: backtrace (..., 0) dumps core on x86
3352 [18086] libc: nice() sets errno to 0 on success
3353 [18240] libc: hcreate, hcreate_r should fail with ENOMEM if element count
3354 is too large (CVE-2015-8778)
3355 [18251] dynamic-link: SONAME missing when audit modules provides path
3356 [18265] libc: add attributes for wchar string and memory functions
3357 [18370] math: csqrt missing underflows
3358 [18421] libc: [hppa] read-only segment has dynamic relocations
3359 [18472] libc: Obsolete syscall wrappers should be compat symbols
3360 [18480] libc: hppa glibc miscompilation in sched_setaffinity()
3361 [18491] localedata: Update tr_TR LC_CTYPE as part of Unicode updates
3362 [18525] localedata: Remove locale timezone information
3363 [18560] libc: [powerpc] spurious bits/ipc.h definitions
3364 [18568] localedata: Update locale data to Unicode 8.0
3365 [18589] locale: sort-test.sh fails at random
3366 [18595] math: ctan, ctanh missing underflows
3367 [18604] libc: assert macro-expands its argument
3368 [18610] math: S390: fetestexcept() reports any exception if DXC-code
3369 contains a vector instruction exception.
3370 [18611] math: j1, jn missing errno setting on underflow
3371 [18618] localedata: sync Chechen locale definitions with other *_RU
3373 [18647] math: powf(-0x1.000002p0, 0x1p30) returns 0 instead of +inf
3374 [18661] libc: Some x86-64 assembly codes don't align stack to 16 bytes
3375 [18665] network: In send_dg, the recvfrom function is NOT always using the
3376 buffer size of a newly created buffer (CVE-2015-7547)
3377 [18674] libc: [i386] trunk/sysdeps/i386/tst-auditmod3b.c:84: possible
3379 [18675] libc: fpathconf(_PC_NAME_MAX) fails against large filesystems for
3381 [18681] libc: regexp.h is obsolete and buggy, and should be desupported
3382 [18699] math: tilegx cproj() for various complex infinities does not yield
3384 [18724] libc: Harden put*ent functions against data injection
3385 [18743] nptl: PowerPC: findutils testcase fails with --enable-lock-elision
3386 [18755] build: build errors with -DNDEBUG
3387 [18757] stdio: fmemopen fails to set errno on failure
3388 [18778] dynamic-link: ld.so crashes if failed dlopen causes libpthread to
3390 [18781] libc: openat64 lacks O_LARGEFILE
3391 [18787] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/atomic.h:71:6:
3392 error: can’t find a register in class ‘R1_REGS’ while reloading ‘asm’
3393 [18789] math: [ldbl-128ibm] sinhl inaccurate near 0
3394 [18790] math: [ldbl-128ibm] tanhl inaccurate
3395 [18795] libc: stpncpy fortification misses buffer lengths that are
3396 statically too large
3397 [18796] build: build fails for --disable-mathvec
3398 [18803] math: hypot missing underflows
3399 [18820] stdio: fmemopen may leak memory on failure
3400 [18823] math: csqrt spurious underflows
3401 [18824] math: fma spurious underflows
3402 [18825] math: pow missing underflows
3403 [18857] math: [ldbl-128ibm] nearbyintl wrongly uses signaling comparisons
3404 [18868] nptl: pthread_barrier_init typo has in-theory-undefined behavior
3405 [18870] build: sem_open.c fails to compile with missing symbol
3407 [18872] stdio: Fix memory leak in printf_positional
3408 [18873] libc: posix_fallocate overflow check ineffective
3409 [18875] math: Excess precision leads incorrect libm
3410 [18877] libc: arm: mmap offset regression
3411 [18887] libc: memory corruption when using getmntent on blank lines
3412 [18918] localedata: hu_HU: change time to HH:MM:SS format
3413 [18921] libc: Regression: extraneous stat() and fstat() performed by
3415 [18928] dynamic-link: LD_POINTER_GUARD is not ignored for privileged
3416 binaries (CVE-2015-8777)
3417 [18951] math: tgamma missing underflows
3418 [18952] math: [ldbl-128/ldbl-128ibm] lgammal spurious "invalid", incorrect
3420 [18953] localedata: lt_LT: change currency symbol to the euro
3421 [18956] math: powf inaccuracy
3422 [18961] math: [i386] exp missing underflows
3423 [18966] math: [i386] exp10 missing underflows
3424 [18967] math: math.h XSI POSIX namespace (gamma, isnan, scalb)
3425 [18969] build: multiple string test failures due to missing locale
3427 [18970] libc: Reference of pthread_setcancelstate in libc.a
3428 [18977] math: float / long double Bessel functions not in XSI POSIX
3429 [18980] math: i386 libm functions return with excess range and precision
3430 [18981] math: i386 scalb*, ldexp return with excess range and precision
3431 [18982] stdio: va_list and vprintf
3432 [18985] time: Passing out of range data to strftime() causes a segfault
3434 [19003] math: [x86_64] fma4 version of pow inappropriate contraction
3435 [19007] libc: FAIL: elf/check-localplt with -z now and binutils 2.26
3436 [19012] locale: iconv_open leaks memory on error path
3437 [19016] math: clog, clog10 inaccuracy
3438 [19018] nptl: Mangle function pointers in tls_dtor_list
3439 [19032] math: [i386] acosh (-qNaN) spurious "invalid" exception
3440 [19046] math: ldbl-128 / ldbl-128ibm lgamma bad overflow handling
3441 [19048] malloc: malloc: arena free list can become cyclic, increasing
3443 [19049] math: [powerpc] erfc incorrect zero sign
3444 [19050] math: [powerpc] log* incorrect zero sign
3445 [19058] math: [x86_64] Link fail with -fopenmp and -flto
3446 [19059] math: nexttoward overflow incorrect in non-default rounding modes
3447 [19071] math: ldbl-96 lroundl incorrect just below powers of 2
3448 [19074] network: Data race in _res_hconf_reorder_addrs
3449 [19076] math: [ldbl-128ibm] log1pl (-1) wrong sign of infinity
3450 [19077] math: [ldbl-128ibm] logl (1) incorrect sign of zero result
3451 [19078] math: [ldbl-128ibm] expl overflow incorrect in non-default
3453 [19079] math: dbl-64/wordsize-64 lround based on llround incorrect for
3455 [19085] math: ldbl-128 lrintl, lroundl missing exceptions for 32-bit long
3456 [19086] manual: posix_fallocate64 documented argument order is wrong.
3457 [19088] math: lround, llround missing exceptions close to overflow
3459 [19094] math: lrint, llrint missing exceptions close to overflow threshold
3460 [19095] math: dbl-64 lrint incorrect for 64-bit long
3461 [19122] dynamic-link: Unnecessary PLT relocations in librtld.os
3462 [19124] dynamic-link: ld.so failed to build with older assmebler
3463 [19125] math: [powerpc32] llroundf, llround incorrect exceptions
3464 [19129] dynamic-link: [arm] Concurrent lazy TLSDESC resolution can crash
3465 [19134] math: [powerpc32] lround, lroundf spurious exceptions
3466 [19137] libc: i386/epoll_pwait.S doesn't support cancellation
3467 [19143] nptl: Remove CPU set size checking from sched_setaffinity,
3468 pthread_setaffinity_np
3469 [19156] math: [ldbl-128] j0l spurious underflows
3470 [19164] nptl: tst-getcpu fails with many possible CPUs
3471 [19168] math: math/test-ildoubl and math/test-ldouble failure
3472 [19174] nptl: PowerPC: TLE enabled pthread mutex performs poorly.
3473 [19178] dynamic-link: ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA confuses
3475 [19181] math: [i386/x86_64] fesetenv (FE_DFL_ENV), fesetenv
3476 (FE_NOMASK_ENV) do not clear SSE exceptions
3477 [19182] malloc: malloc deadlock between ptmalloc_lock_all and
3478 _int_new_arena/reused_arena
3479 [19189] math: [ldbl-128] log1pl (-qNaN) spurious "invalid" exception
3480 [19201] math: dbl-64 remainder incorrect sign of zero result
3481 [19205] math: bits/math-finite.h conditions do not match math.h and
3483 [19209] math: bits/math-finite.h wrongly maps ldexp to scalbn
3484 [19211] math: lgamma functions do not set signgam for -ffinite-math-only
3485 for C99-based standards
3486 [19212] libc: features.h not -Wundef clean
3487 [19213] math: [i386/x86_64] log* (1) incorrect zero sign for -ffinite-
3489 [19214] libc: Family and model identification for AMD CPU's are incorrect.
3490 [19219] libc: GLIBC build fails for ia64 with missing __nearbyintl
3491 [19228] math: [powerpc] nearbyint wrongly clears "inexact", leaves traps
3493 [19235] math: [powerpc64] lround, lroundf, llround, llroundf spurious
3494 "inexact" exceptions
3495 [19238] math: [powerpc] round, roundf spurious "inexact" for integer
3497 [19242] libc: strtol incorrect in Turkish locales
3498 [19243] malloc: reused_arena can pick an arena on the free list, leading
3499 to an assertion failure and reference count corruption
3500 [19253] time: tzset() ineffective when temporary TZ did not include DST
3502 [19266] math: strtod ("NAN(I)") incorrect in Turkish locales
3503 [19270] math: [hppa] Shared libm missing __isnanl
3504 [19285] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/mman.h: missing
3505 MAP_HUGETLB and MAP_STACK defines
3506 [19313] nptl: Wrong __cpu_mask for x32
3507 [19347] libc: grantpt: try to force a specific gid even without pt_chown
3508 [19349] math: [ldbl-128ibm] tanhl inaccurate for small arguments
3509 [19350] math: [ldbl-128ibm] sinhl spurious overflows
3510 [19351] math: [ldbl-128ibm] logl inaccurate near 1
3511 [19363] time: x32: times() return value wrongly truncates/sign extends
3513 [19367] dynamic-link: Improve branch prediction on Silvermont
3514 [19369] network: Default domain name not reset by res_ninit when "search"
3515 / "domain" entry is removed from resolv.conf
3516 [19375] math: powerpc: incorrect results for POWER7 logb with negative
3518 [19385] localedata: bg_BG: time separator should be colon, not comma
3519 [19408] libc: linux personality syscall wrapper may erroneously return an
3520 error on 32-bit architectures
3521 [19415] libc: dladdr returns wrong names on hppa
3522 [19432] libc: iconv rejects redundant escape sequences in IBM900, IBM903,
3523 IBM905, IBM907, and IBM909
3524 [19439] math: Unix98 isinf and isnan functions conflict with C++11
3525 [19443] build: build failures with -DDEBUG
3526 [19451] build: Make check fails on test-double-vlen2
3527 [19462] libc: Glibc failed to build with -Os
3528 [19465] math: Wrong code with -Os
3529 [19466] time: time/tst-mktime2.c is compiled into an infinite loop with
3531 [19467] string: Fast_Unaligned_Load needs to be enabled for Excavator core
3533 [19475] libc: Glibc 2.22 doesn't build on sparc [PATCH]
3534 [19486] math: S390: Math tests fail with "Exception Inexact set".
3535 [19529] libc: [ARM]: FAIL: stdlib/tst-makecontext
3536 [19550] libc: [mips] mmap negative offset handling inconsistent with other
3538 [19590] math: Fail to build shared objects that use libmvec.so functions.
3542 * The following bugs are resolved with this release:
3544 438, 2981, 4719, 6544, 6792, 11216, 12836, 13028, 13064, 13151, 13152,
3545 14094, 14113, 14292, 14841, 14906, 14958, 15319, 15467, 15790, 15969,
3546 16159, 16339, 16350, 16351, 16352, 16353, 16361, 16512, 16526, 16538,
3547 16559, 16560, 16704, 16783, 16850, 17053, 17090, 17195, 17269, 17293,
3548 17322, 17403, 17475, 17523, 17542, 17569, 17581, 17588, 17596, 17620,
3549 17621, 17628, 17631, 17692, 17711, 17715, 17776, 17779, 17792, 17833,
3550 17836, 17841, 17912, 17916, 17930, 17932, 17944, 17949, 17964, 17965,
3551 17967, 17969, 17977, 17978, 17987, 17991, 17996, 17998, 17999, 18007,
3552 18019, 18020, 18029, 18030, 18032, 18034, 18036, 18038, 18039, 18042,
3553 18043, 18046, 18047, 18049, 18068, 18078, 18080, 18093, 18100, 18104,
3554 18110, 18111, 18116, 18125, 18128, 18134, 18138, 18185, 18196, 18197,
3555 18206, 18210, 18211, 18217, 18219, 18220, 18221, 18234, 18244, 18245,
3556 18247, 18287, 18319, 18324, 18333, 18346, 18371, 18383, 18397, 18400,
3557 18409, 18410, 18412, 18418, 18422, 18434, 18444, 18457, 18468, 18469,
3558 18470, 18479, 18483, 18495, 18496, 18497, 18498, 18502, 18507, 18508,
3559 18512, 18513, 18519, 18520, 18522, 18527, 18528, 18529, 18530, 18532,
3560 18533, 18534, 18536, 18539, 18540, 18542, 18544, 18545, 18546, 18547,
3561 18549, 18553, 18557, 18558, 18569, 18583, 18585, 18586, 18592, 18593,
3562 18594, 18602, 18612, 18613, 18619, 18633, 18635, 18641, 18643, 18648,
3563 18657, 18676, 18694, 18696, 18887.
3565 * Cache information can be queried via sysconf() function on s390 e.g. with
3566 _SC_LEVEL1_ICACHE_SIZE as argument.
3568 * A buffer overflow in gethostbyname_r and related functions performing DNS
3569 requests has been fixed. If the NSS functions were called with a
3570 misaligned buffer, the buffer length change due to pointer alignment was
3571 not taken into account. This could result in application crashes or,
3572 potentially arbitrary code execution, using crafted, but syntactically
3573 valid DNS responses. (CVE-2015-1781)
3575 * The time zone file parser has been made more robust against crafted time
3576 zone files, avoiding heap buffer overflows related to the processing of
3577 the tzh_ttisstdcnt and tzh_ttisgmtcnt fields, and a stack overflow due to
3578 large time zone data files. Overly long time zone specifiers in the TZ
3579 variable no longer result in stack overflows and crashes.
3581 * A powerpc and powerpc64 optimization for TLS, similar to TLS descriptors
3582 for LD and GD on x86 and x86-64, has been implemented. You will need
3583 binutils-2.24 or later to enable this optimization.
3585 * Character encoding and ctype tables were updated to Unicode 7.0.0, using
3586 new generator scripts contributed by Pravin Satpute and Mike FABIAN (Red
3587 Hat). These updates cause user visible changes, such as the fix for bug
3590 * CVE-2014-8121 The NSS backends shared internal state between the getXXent
3591 and getXXbyYY NSS calls for the same database, causing a denial-of-service
3592 condition in some applications.
3594 * Added vector math library named libmvec with the following vectorized x86_64
3595 implementations: cos, cosf, sin, sinf, sincos, sincosf, log, logf, exp, expf,
3597 The library can be disabled with --disable-mathvec. Use of the functions is
3598 enabled with -fopenmp -ffast-math starting from -O1 for GCC version >= 4.9.0.
3599 Shared library libmvec.so is linked in as needed when using -lm (no need to
3600 specify -lmvec explicitly for not static builds).
3601 Visit <https://sourceware.org/glibc/wiki/libmvec> for detailed information.
3603 * A new fmemopen implementation has been added with the goal of POSIX
3604 compliance. The new implementation fixes the following long-standing
3605 issues: BZ#6544, BZ#11216, BZ#12836, BZ#13151, BZ#13152, and BZ#14292. The
3606 old implementation is still present for use be by existing binaries.
3608 * The 32-bit sparc sigaction ABI was inadvertently broken in the 2.20 and 2.21
3609 releases. It has been fixed to match 2.19 and older, but binaries built
3610 against 2.20 and 2.21 might need to be recompiled. See BZ#18694.
3612 * Port to Native Client running on ARMv7-A (--host=arm-nacl).
3613 Contributed by Roland McGrath (Google).
3615 * The header <regexp.h> is deprecated, and will be removed in a future
3616 release. Use of this header will trigger a deprecation warning.
3617 Application developers should update their code to use <regex.h> instead.
3619 This header was formerly part of SUS, but was deprecated in 1994 and
3620 removed from the standard in 2001. Also, the glibc implementation
3621 leaks memory. See BZ#18681 for more details.
3625 * The following bugs are resolved with this release:
3627 6652, 10672, 12674, 12847, 12926, 13862, 14132, 14138, 14171, 14498,
3628 15215, 15378, 15884, 16009, 16418, 16191, 16469, 16576, 16617, 16618,
3629 16619, 16657, 16740, 16857, 17192, 17266, 17273, 17344, 17363, 17370,
3630 17371, 17411, 17460, 17475, 17485, 17501, 17506, 17508, 17522, 17555,
3631 17570, 17571, 17572, 17573, 17574, 17582, 17583, 17584, 17585, 17589,
3632 17594, 17601, 17608, 17616, 17625, 17630, 17633, 17634, 17635, 17647,
3633 17653, 17657, 17658, 17664, 17665, 17668, 17682, 17702, 17717, 17719,
3634 17722, 17723, 17724, 17725, 17732, 17733, 17744, 17745, 17746, 17747,
3635 17748, 17775, 17777, 17780, 17781, 17782, 17791, 17793, 17796, 17797,
3636 17801, 17803, 17806, 17834, 17844, 17848, 17868, 17869, 17870, 17885,
3639 * CVE-2015-1472 CVE-2015-1473 Under certain conditions wscanf can allocate
3640 too little memory for the to-be-scanned arguments and overflow the
3641 allocated buffer. The implementation now correctly computes the required
3642 buffer size when using malloc, and switches to malloc from alloca as
3645 * A new semaphore algorithm has been implemented in generic C code for all
3646 machines. Previous custom assembly implementations of semaphore were
3647 difficult to reason about or ensure that they were safe. The new version
3648 of semaphore supports machines with 64-bit or 32-bit atomic operations.
3649 The new semaphore algorithm is used by sem_init, sem_open, sem_post,
3650 sem_wait, sem_timedwait, sem_trywait, and sem_getvalue.
3652 * Port to Altera Nios II has been contributed by Mentor Graphics.
3654 * Optimized strcpy, stpcpy, strncpy, stpncpy, strcmp, and strncmp
3655 implementations for powerpc64/powerpc64le.
3656 Implemented by Adhemerval Zanella (IBM).
3658 * Added support for TSX lock elision of pthread mutexes on powerpc32, powerpc64
3659 and powerpc64le. This may improve lock scaling of existing programs on
3660 HTM capable systems. The lock elision code is only enabled with
3661 --enable-lock-elision=yes. Also, the TSX lock elision implementation for
3662 powerpc will issue a transaction abort on every syscall to avoid side
3663 effects being visible outside transactions.
3665 * Optimized strcpy, stpcpy, strchrnul and strrchr implementations for
3666 AArch64. Contributed by ARM Ltd.
3668 * i386 memcpy functions optimized with SSE2 unaligned load/store.
3670 * CVE-2104-7817 The wordexp function could ignore the WRDE_NOCMD flag
3671 under certain input conditions resulting in the execution of a shell for
3672 command substitution when the application did not request it. The
3673 implementation now checks WRDE_NOCMD immediately before executing the
3674 shell and returns the error WRDE_CMDSUB as expected.
3676 * CVE-2012-3406 printf-style functions could run into a stack overflow when
3677 processing format strings with a large number of format specifiers.
3679 * CVE-2014-9402 The nss_dns implementation of getnetbyname could run into an
3680 infinite loop if the DNS response contained a PTR record of an unexpected
3683 * The minimum GCC version that can be used to build this version of the GNU
3684 C Library is GCC 4.6. Older GCC versions, and non-GNU compilers, can
3685 still be used to compile programs using the GNU C Library.
3687 * The GNU C Library is now built with -Werror by default. This can be
3688 disabled by configuring with --disable-werror.
3690 * New locales: tu_IN, bh_IN, raj_IN, ce_RU.
3692 * The obsolete sigvec function has been removed. This was the original
3693 4.2BSD interface that inspired the POSIX.1 sigaction interface, which
3694 programs have been using instead for about 25 years. Of course, ABI
3695 compatibility for old binaries using sigvec remains intact.
3697 * Merged gettext 0.19.3 into the intl subdirectory. This fixes building
3698 with newer versions of bison.
3700 * Support for MIPS o32 FPXX, FP64A and FP64 ABI Extensions.
3701 The original MIPS o32 hard-float ABI requires an FPU where double-precision
3702 registers overlay two consecutive single-precision registers. MIPS32R2
3703 introduced a new FPU mode (FR=1) where double-precision registers extend the
3704 corresponding single-precision registers which is incompatible with the
3705 o32 hard-float ABI. The MIPS SIMD ASE and the MIPSR6 architecture both
3706 require the use of FR=1 making a transition necessary. New o32 ABI
3707 extensions enable users to migrate over time from the original o32 ABI
3708 through to the updated o32 FP64 ABI. To achieve this the dynamic linker now
3709 tracks the ABI of any loaded object and verifies that new objects are
3710 compatible. Mode transitions will also be requested as required and
3711 unsupportable objects will be rejected. The ABI checks include both soft and
3712 hard float ABIs for o32, n32 and n64.
3714 GCC 5 with GNU binutils 2.25 onwards:
3715 It is strongly recommended that all o32 system libraries are built using the
3716 new o32 FPXX ABI (-mfpxx) to facilitate the transition as this is compatible
3717 with the original and all new o32 ABI extensions. Configure a MIPS GCC
3718 compiler using --with-fp-32=xx to set this by default.
3722 * The following bugs are resolved with this release:
3724 6804, 9894, 11505, 12994, 13347, 13651, 14308, 14770, 15119, 15132, 15347,
3725 15514, 15698, 15804, 15894, 15946, 16002, 16064, 16095, 16194, 16198,
3726 16275, 16284, 16287, 16315, 16348, 16349, 16354, 16357, 16362, 16447,
3727 16516, 16532, 16539, 16545, 16561, 16562, 16564, 16574, 16599, 16600,
3728 16609, 16610, 16611, 16613, 16619, 16623, 16629, 16632, 16634, 16639,
3729 16642, 16648, 16649, 16670, 16674, 16677, 16680, 16681, 16683, 16689,
3730 16695, 16701, 16706, 16707, 16712, 16713, 16714, 16724, 16731, 16739,
3731 16740, 16743, 16754, 16758, 16759, 16760, 16770, 16786, 16789, 16791,
3732 16796, 16799, 16800, 16815, 16823, 16824, 16831, 16838, 16839, 16849,
3733 16854, 16876, 16877, 16878, 16882, 16885, 16888, 16890, 16892, 16912,
3734 16915, 16916, 16917, 16918, 16922, 16927, 16928, 16932, 16943, 16958,
3735 16965, 16966, 16967, 16977, 16978, 16984, 16990, 16996, 17009, 17022,
3736 17031, 17042, 17048, 17050, 17058, 17061, 17062, 17069, 17075, 17078,
3737 17079, 17084, 17086, 17088, 17092, 17097, 17125, 17135, 17137, 17150,
3738 17153, 17187, 17213, 17259, 17261, 17262, 17263, 17319, 17325, 17354.
3740 * Reverted change of ABI data structures for s390 and s390x:
3741 On s390 and s390x the size of struct ucontext and jmp_buf was increased in
3742 2.19. This change is reverted in 2.20. The introduced 2.19 symbol versions
3743 of getcontext, setjmp, _setjmp, __sigsetjmp, longjmp, _longjmp, siglongjmp
3744 are preserved pointing straight to the same implementation as the old ones.
3745 Given that, new callers will simply provide a too-big buffer to these
3746 functions. Any applications/libraries out there that embed jmp_buf or
3747 ucontext_t in an ABI-relevant data structure that have already been rebuilt
3748 against 2.19 headers will have to rebuilt again. This is necessary in any
3749 case to revert the breakage in their ABI caused by the glibc change.
3751 * Support for file description locks is added to systems running the
3752 Linux kernel. The standard file locking interfaces are extended to
3753 operate on file descriptions, not file descriptors, via the use of
3754 F_OFD_GETLK, F_OFD_SETLK, and F_OFD_SETLKW. File description locks
3755 are associated with an open file instead of a process.
3757 * Optimized strchr implementation for AArch64. Contributed by ARM Ltd.
3759 * The minimum Linux kernel version that this version of the GNU C Library
3760 can be used with is 2.6.32.
3762 * Running the testsuite no longer terminates as soon as a test fails.
3763 Instead, a file tests.sum (xtests.sum from "make xcheck") is generated,
3764 with PASS or FAIL lines for individual tests. A summary of the results is
3765 printed, including a list of failing lists, and "make check" exits with
3766 error status if there were any unexpected failures. "make check
3767 stop-on-test-failure=y" may be used to keep the old behavior.
3769 * The am33 port, which had not worked for several years, has been removed
3772 * The _BSD_SOURCE and _SVID_SOURCE feature test macros are no longer
3773 supported; they now act the same as _DEFAULT_SOURCE (but generate a
3774 warning). Except for cases where _BSD_SOURCE enabled BSD interfaces that
3775 conflicted with POSIX (support for which was removed in 2.19), the
3776 interfaces those macros enabled remain available when compiling with
3777 _GNU_SOURCE defined, with _DEFAULT_SOURCE defined, or without any feature
3778 test macros defined.
3780 * Optimized strcmp implementation for ARMv7. Contributed by ARM Ltd.
3782 * Added support for TX lock elision of pthread mutexes on s390 and s390x.
3783 This may improve lock scaling of existing programs on TX capable systems.
3784 The lock elision code is only built with --enable-lock-elision=yes and
3785 then requires a GCC version supporting the TX builtins. With lock elision
3786 default mutexes are elided via __builtin_tbegin, if the cpu supports
3787 transactions. By default lock elision is not enabled and the elision code
3790 * CVE-2014-4043 The posix_spawn_file_actions_addopen implementation did not
3791 copy the path argument. This allowed programs to cause posix_spawn to
3792 deference a dangling pointer, or use an unexpected pathname argument if
3793 the string was modified after the posix_spawn_file_actions_addopen
3796 * All supported architectures now use the main glibc sysdeps directory
3797 instead of some being in a separate "ports" directory (which was
3798 distributed separately before glibc 2.17).
3800 * The NPTL implementation of POSIX pthreads is no longer an "add-on".
3801 On configurations that support it (all Linux configurations), it's now
3802 used regardless of the --enable-add-ons switch to configure. It is no
3803 longer possible to build such configurations without pthreads support.
3805 * Locale names, including those obtained from environment variables (LANG
3806 and the LC_* variables), are more tightly checked for proper syntax.
3807 setlocale will now fail (with EINVAL) for locale names that are overly
3808 long, contain slashes without starting with a slash, or contain ".." path
3809 components. (CVE-2014-0475) Previously, some valid locale names were
3810 silently replaced with the "C" locale when running in AT_SECURE mode
3811 (e.g., in a SUID program). This is no longer necessary because of the
3814 * On x86-64, the dynamic linker's lazy-binding support is now compatible
3815 with application code using Intel MPX instructions. (With all previous
3816 versions, the MPX register state could be clobbered when making calls
3817 into or out of a shared library.) Note that while the new dynamic
3818 linker is compatible with all known x86 hardware whether or not it
3819 supports Intel MPX, some x86 instruction-set emulators might fail to
3820 handle the new instruction encodings. This is known to affect Valgrind
3821 versions up through 3.9 (but will be fixed in the forthcoming 3.10
3822 release), and might affect other tools that do instruction emulation.
3824 * Support for loadable gconv transliteration modules has been removed.
3825 The support for transliteration modules has been non-functional for
3826 over a decade, and the removal is prompted by security defects. The
3827 normal gconv conversion modules are still supported. Transliteration
3828 with //TRANSLIT is still possible, and the //IGNORE specifier
3829 continues to be supported. (CVE-2014-5119)
3831 * Decoding a crafted input sequence in the character sets IBM933, IBM935,
3832 IBM937, IBM939, IBM1364 could result in an out-of-bounds array read,
3833 resulting a denial-of-service security vulnerability in applications which
3834 use functions related to iconv. (CVE-2014-6040)
3838 * The following bugs are resolved with this release:
3840 156, 387, 431, 762, 832, 926, 2801, 4772, 6786, 6787, 6807, 6810, 6981,
3841 7003, 9721, 9954, 10253, 10278, 11087, 11157, 11214, 12100, 12486, 12751,
3842 12986, 13028, 13982, 13985, 14029, 14032, 14120, 14143, 14155, 14286,
3843 14547, 14699, 14752, 14782, 14876, 14910, 15004, 15048, 15073, 15089,
3844 15128, 15218, 15268, 15277, 15308, 15362, 15374, 15400, 15425, 15427,
3845 15483, 15522, 15531, 15532, 15593, 15601, 15608, 15609, 15610, 15632,
3846 15640, 15670, 15672, 15680, 15681, 15723, 15734, 15735, 15736, 15748,
3847 15749, 15754, 15760, 15763, 15764, 15797, 15799, 15825, 15843, 15844,
3848 15846, 15847, 15849, 15850, 15855, 15856, 15857, 15859, 15867, 15886,
3849 15887, 15890, 15892, 15893, 15895, 15897, 15901, 15905, 15909, 15915,
3850 15917, 15919, 15921, 15923, 15939, 15941, 15948, 15963, 15966, 15968,
3851 15985, 15988, 15997, 16032, 16034, 16036, 16037, 16038, 16041, 16046,
3852 16055, 16071, 16072, 16074, 16077, 16078, 16103, 16112, 16143, 16144,
3853 16146, 16150, 16151, 16153, 16167, 16169, 16172, 16195, 16214, 16245,
3854 16271, 16274, 16283, 16289, 16293, 16314, 16316, 16330, 16337, 16338,
3855 16356, 16365, 16366, 16369, 16372, 16375, 16379, 16381, 16384, 16385,
3856 16386, 16387, 16390, 16394, 16398, 16400, 16407, 16408, 16414, 16430,
3857 16431, 16453, 16474, 16506, 16510, 16529
3859 * Slovenian translations for glibc messages have been contributed by the
3860 Translation Project's Slovenian team of translators.
3862 * The public headers no longer use __unused nor __block. This change is to
3863 support compiling programs that are derived from BSD sources and use
3864 __unused internally, and to support compiling with Clang's -fblock
3865 extension which uses __block.
3867 * CVE-2012-4412 The strcoll implementation caches indices and rules for
3868 large collation sequences to optimize multiple passes. This cache
3869 computation may overflow for large collation sequences and may cause a
3870 stack or buffer overflow. This is now fixed to use a slower algorithm
3871 which does not use a cache if there is an integer overflow.
3873 * CVE-2012-4424 The strcoll implementation uses malloc to cache indices and
3874 rules for large collation sequences to optimize multiple passes and falls
3875 back to alloca if malloc fails, resulting in a possible stack overflow.
3876 The implementation now falls back to an uncached collation sequence lookup
3879 * CVE-2013-4788 The pointer guard used for pointer mangling was not
3880 initialized for static applications resulting in the security feature
3881 being disabled. The pointer guard is now correctly initialized to a
3882 random value for static applications. Existing static applications need
3883 to be recompiled to take advantage of the fix (bug 15754).
3885 * CVE-2013-4237 The readdir_r function could write more than NAME_MAX bytes
3886 to the d_name member of struct dirent, or omit the terminating NUL
3887 character. (Bugzilla #14699).
3889 * CVE-2013-4332 The pvalloc, valloc, memalign, posix_memalign and
3890 aligned_alloc functions could allocate too few bytes or corrupt the
3891 heap when passed very large allocation size values (Bugzilla #15855,
3894 * CVE-2013-4458 Stack overflow in getaddrinfo with large number of results
3895 for AF_INET6 has been fixed (Bugzilla #16072).
3897 * New locales: ak_GH, anp_IN, ar_SS, cmn_TW, hak_TW, lzh_TW, nan_TW, pap_AW,
3898 pap_CW, quz_PE, the_NP.
3900 * Substantially revised locales: gd_GB, ht_HT
3902 * The LC_ADDRESS field was updated to support country_car for almost all
3905 * ISO 1427 definitions were updated.
3907 * ISO 3166 definitions were updated.
3909 * The localedef utility now supports --big-endian and --little-endian
3910 command-line options to generate locales for a different system from that
3911 for which the C library was built.
3913 * Binary locale files now only depend on the endianness of the system for
3914 which they are generated and not on other properties of that system. As a
3915 consequence, binary files generated with new localedef may be incompatible
3916 with old versions of the GNU C Library, and binary files generated with
3917 old localedef may be incompatible with this version of the GNU C Library,
3918 in the following circumstances:
3920 + Locale files may be incompatible on m68k systems.
3922 + Locale archive files (but not separate files for individual locales) may
3923 be incompatible on systems where plain "char" is signed.
3925 * The configure option --disable-versioning has been removed. Builds with
3926 --disable-versioning had not worked for several years.
3928 * ISO 639 definitions were updated for Chiga (cgg) and Chinese (gan, hak, czh,
3929 cjy, lzh, cmn, mnp, cdo, czo, cpx, wuu, hsn, yue).
3931 * SystemTap probes for malloc have been introduced.
3933 * SystemTap probes for slow multiple precision fallback paths of
3934 transcendental functions have been introduced.
3936 * Support for powerpc64le has been added.
3938 * The soft-float powerpc port now supports e500 processors.
3940 * Support for STT_GNU_IFUNC symbols added for ppc32/power4+ and ppc64.
3942 * A new feature test macro _DEFAULT_SOURCE is available to enable the same
3943 set of header declarations that are enabled by default, even when other
3944 feature test macros or compiler options such as -std=c99 would otherwise
3945 disable some of those declarations.
3947 * The _BSD_SOURCE feature test macro no longer enables BSD interfaces that
3948 conflict with POSIX. The libbsd-compat library (which was a dummy library
3949 that did nothing) has also been removed.
3951 * Preliminary documentation about Multi-Thread, Async-Signal and
3952 Async-Cancel Safety has been added.
3954 * Change of ABI data structures for s390 and s390x:
3955 On s390 and s390x the size of struct ucontext and jmp_buf was increased to
3956 allow for future hardware extensions. All library functions that accept or
3957 return these structures were versioned in order to provide backwards
3958 compatibility with existing code. However, not all cases can be handled
3959 with interface versioning. If an application embeds either structure into
3960 another structure and that structure is passed to another compilation unit
3961 which expects the newer larger-sized object then any access to the new
3962 fields will result in undefined behaviour. Similarly any access to fields
3963 that were moved by the enlarging of the structures will cause undefined
3964 behaviour. To fix the undefined behaviour all objects that are part of the
3965 final in-memory image must agree on the size of structures, and this may
3966 require recompilation.
3970 * The following bugs are resolved with this release:
3972 2546, 2560, 5159, 6809, 7006, 10060, 10062, 10283, 10357, 10686, 11120,
3973 11561, 12310, 12387, 12492, 12515, 12723, 13550, 13889, 13951, 13988,
3974 14142, 14176, 14200, 14256, 14280, 14293, 14317, 14327, 14478, 14496,
3975 14582, 14686, 14812, 14888, 14894, 14907, 14908, 14909, 14920, 14941,
3976 14952, 14964, 14981, 14982, 14985, 14991, 14994, 14996, 15000, 15003,
3977 15006, 15007, 15014, 15020, 15022, 15023, 15036, 15054, 15055, 15062,
3978 15078, 15084, 15085, 15086, 15100, 15160, 15214, 15221, 15232, 15234,
3979 15283, 15285, 15287, 15304, 15305, 15307, 15309, 15327, 15330, 15335,
3980 15336, 15337, 15339, 15342, 15346, 15359, 15361, 15366, 15380, 15381,
3981 15394, 15395, 15405, 15406, 15409, 15416, 15418, 15419, 15423, 15424,
3982 15426, 15429, 15431, 15432, 15441, 15442, 15448, 15465, 15480, 15485,
3983 15488, 15490, 15492, 15493, 15497, 15506, 15529, 15536, 15553, 15577,
3984 15583, 15618, 15627, 15631, 15654, 15655, 15666, 15667, 15674, 15711,
3987 * CVE-2013-2207 Incorrectly granting access to another user's pseudo-terminal
3988 has been fixed by disabling the use of pt_chown (Bugzilla #15755).
3989 Distributions can re-enable building and using pt_chown via the new configure
3990 option `--enable-pt_chown'. Enabling the use of pt_chown carries with it
3991 considerable security risks and should only be used if the distribution
3992 understands and accepts the risks.
3994 * CVE-2013-0242 Buffer overrun in regexp matcher has been fixed (Bugzilla
3997 * CVE-2013-1914 Stack overflow in getaddrinfo with many results has been
3998 fixed (Bugzilla #15330).
4000 * Add support for calling C++11 thread_local object destructors on thread
4001 and program exit. This needs compiler support for offloading C++11
4002 destructor calls to glibc.
4004 * Improved worst case performance of libm functions with double inputs and
4007 * Support for priority inherited mutexes in pthread condition variables on
4008 non-x86 architectures.
4010 * Port to Xilinx MicroBlaze contributed by David Holsgrove.
4012 * Optimized string functions for AArch64. Implemented by Marcus Shawcroft.
4014 * Optimized string functions for ARM. Implemented by Will Newton and
4017 * Optimized libm functions for SPARC. Implemented by David S. Miller.
4019 * Support for building more of ARM glibc as Thumb-2 code. Implemented by
4022 * Support for building most of MIPS glibc as MIPS16 code. Implemented by
4023 Chung-Lin Tang, Maciej W. Rozycki and Maxim Kuvyrkov.
4025 * Added a benchmark framework to track performance of functions in glibc.
4027 * New <math.h> macro named issignaling to check for a signaling NaN (sNaN).
4028 It is based on draft TS 18661 and currently enabled as a GNU extension.
4030 * On Linux, the clock function now uses the clock_gettime system call
4031 for improved precision, rather than old times system call.
4033 * Added support for version-3 tz format files. This is needed when using
4034 the tz database release 2013e or later, and affects a few unusual cases --
4035 currently only TZ='America/Godthab' for time stamps after 2037.
4037 * Added new API functions pthread_getattr_default_np and
4038 pthread_setattr_default_np to get and set the default pthread
4039 attributes of a process.
4041 * Added support for TSX lock elision for pthread mutexes on i386 and x86-64.
4042 This may improve lock scaling of existing programs on TSX capable systems.
4043 When the --enable-lock-elision=yes parameter is specified at configure
4044 time lock elision will be enabled by default for all PTHREAD_MUTEX_DEFAULT
4047 * Support added for AT_HWCAP2 (to coincide with Linux kernel 3.10
4048 availability). Implemented by Ryan S. Arnold.
4050 * Support added for POWER8 platform. Implemented by Ryan S. Arnold.
4054 * The following bugs are resolved with this release:
4056 1349, 3439, 3479, 3665, 5044, 5246, 5298, 5400, 6530, 6677, 6778, 6808,
4057 9685, 9914, 10014, 10038, 10114, 10191, 10631, 10873, 11438, 11607, 11638,
4058 11741, 12140, 13013, 13412, 13542, 13601, 13603, 13604, 13629, 13679,
4059 13696, 13698, 13717, 13741, 13759, 13761, 13763, 13881, 13939, 13950,
4060 13952, 13966, 14042, 14047, 14090, 14150, 14151, 14152, 14154, 14157,
4061 14166, 14173, 14195, 14197, 14237, 14246, 14251, 14252, 14283, 14298,
4062 14303, 14307, 14328, 14331, 14336, 14337, 14347, 14349, 14368, 14376,
4063 14417, 14447, 14459, 14476, 14477, 14501, 14505, 14510, 14516, 14518,
4064 14519, 14530, 14532, 14538, 14543, 14544, 14545, 14557, 14562, 14568,
4065 14576, 14579, 14583, 14587, 14595, 14602, 14610, 14621, 14638, 14645,
4066 14648, 14652, 14660, 14661, 14669, 14672, 14683, 14694, 14716, 14719,
4067 14743, 14767, 14783, 14784, 14785, 14793, 14796, 14797, 14801, 14803,
4068 14805, 14807, 14811, 14815, 14821, 14822, 14824, 14828, 14831, 14833,
4069 14835, 14838, 14856, 14863, 14865, 14866, 14868, 14869, 14871, 14872,
4070 14879, 14889, 14893, 14898, 14914.
4072 * Optimization of memcpy for MIPS.
4074 * CVE-2011-4609 svc_run() produces high cpu usage when accept fails with
4075 EMFILE has been fixed (Bugzilla #14889).
4077 * The add-on ports collection is now distributed in the "ports" subdirectory
4078 of the main GNU C Library distribution, rather than separately.
4080 * Port to ARM AArch64 contributed by Linaro.
4082 * Support for STT_GNU_IFUNC symbols added for s390 and s390x.
4083 Optimized versions of memcpy, memset, and memcmp added for System z10 and
4085 Implemented by Andreas Krebbel.
4087 * The new function secure_getenv allows secure access to the environment,
4088 returning NULL if running in a SUID/SGID process. This function replaces
4089 the internal function __secure_getenv.
4091 * SystemTap static probes have been added into the dynamic linker.
4092 Implemented by Gary Benson.
4094 * Optimizations of string functions strstr, strcasestr and memmem.
4095 Implemented by Maxim Kuvyrkov.
4097 * The minimum Linux kernel version that this version of the GNU C Library
4098 can be used with is 2.6.16.
4100 * Optimizations of string functions memchr, wcschr, wcscpy, and wcsrchr for
4101 powerpc POWER7. Implemented by Will Schmidt.
4103 * New configure option --disable-nscd builds the C library such that it
4104 never attempts to contact the Name Service Caching Daemon (nscd).
4105 New configure option --disable-build-nscd avoids building nscd itself;
4106 this is the default if --disable-nscd is used.
4108 * Improved support for cross-compilation, including cross-testing and
4109 bootstrap builds without a previously built glibc.
4111 * Several testsuite tests are now able to test multiple IFUNC variants of an
4112 interface, rather than just testing the one that would be chooen by
4115 * New configure options --with-bugurl and --with-pkgversion, for
4116 distributors to use to embed their bug-reporting and package version
4117 information in --help and --version output.
4119 * The ttyname and ttyname_r functions on Linux now fall back to searching for
4120 the tty file descriptor in /dev/pts or /dev if /proc is not available. This
4121 allows creation of chroots without the procfs mounted on /proc.
4123 * The `crypt' function now fails if passed salt bytes that violate the
4124 specification for those values. On Linux, the `crypt' function will
4125 consult /proc/sys/crypto/fips_enabled to determine if "FIPS mode" is
4126 enabled, and fail on encrypted strings using the MD5 or DES algorithm
4127 when the mode is enabled.
4129 * The `clock_*' suite of functions (declared in <time.h>) is now available
4130 directly in the main C library. Previously it was necessary to link with
4131 -lrt to use these functions. This change has the effect that a
4132 single-threaded program that uses a function such as `clock_gettime' (and
4133 is not linked with -lrt) will no longer implicitly load the pthreads
4134 library at runtime and so will not suffer the overheads associated with
4135 multi-thread support in other code such as the C++ runtime library.
4137 * New locales: ayc_PE, doi_IN, ia_FR, mni_IN, nhn_MX, niu_NU, niu_NZ,
4142 * The following bugs are resolved with this release:
4144 174, 208, 350, 369, 411, 706, 766, 2074, 2541, 2547, 2548, 2550, 2551,
4145 2552, 2553, 2554, 2562, 2563, 2565, 2566, 2570, 2576, 2636, 2678, 3335,
4146 3440, 3748, 3768, 3866, 3868, 3906, 3976, 3992, 4026, 4108, 4596, 4822,
4147 5077, 5461, 5805, 5993, 6471, 6486, 6578, 6649, 6730, 6770, 6794, 6884,
4148 6890, 6894, 6895, 6907, 6911, 6959, 7064, 9739, 9902, 10110, 10135, 10140,
4149 10153, 10210, 10254, 10346, 10375, 10545, 10716, 10846, 10882, 11174,
4150 11261, 11322, 11365, 11451, 11494, 11521, 11677, 11837, 11959, 12047,
4151 12097, 12193, 12194, 12297, 12298, 12301, 12340, 12354, 12416, 12495,
4152 13058, 13223, 13361, 13525, 13526, 13527, 13528, 13529, 13530, 13531,
4153 13532, 13533, 13547, 13551, 13552, 13553, 13555, 13556, 13559, 13563,
4154 13566, 13576, 13579, 13583, 13592, 13594, 13613, 13618, 13637, 13656,
4155 13658, 13673, 13691, 13695, 13704, 13705, 13706, 13718, 13726, 13738,
4156 13739, 13743, 13750, 13758, 13760, 13761, 13775, 13786, 13787, 13792,
4157 13806, 13824, 13840, 13841, 13844, 13846, 13848, 13851, 13852, 13854,
4158 13871, 13872, 13873, 13879, 13882, 13883, 13884, 13885, 13886, 13892,
4159 13895, 13908, 13910, 13911, 13912, 13913, 13914, 13915, 13916, 13917,
4160 13918, 13919, 13920, 13921, 13922, 13923, 13924, 13926, 13927, 13928,
4161 13938, 13941, 13942, 13954, 13955, 13956, 13963, 13967, 13968, 13970,
4162 13973, 13979, 13983, 13986, 13996, 14012, 14027, 14033, 14034, 14036,
4163 14040, 14043, 14044, 14048, 14049, 14050, 14053, 14055, 14059, 14064,
4164 14075, 14080, 14083, 14103, 14104, 14109, 14112, 14117, 14122, 14123,
4165 14134, 14153, 14183, 14188, 14199, 14210, 14218, 14229, 14241, 14273,
4168 * Support for the x32 ABI on x86-64 added. The x32 target is selected by
4169 configuring glibc with:
4170 BUILD_CC='gcc' CC='gcc -mx32' CXX='g++ -mx32'
4171 Visit <https://sites.google.com/site/x32abi/> for more x32 ABI info.
4172 Implemented by H.J. Lu.
4176 + define static_assert
4178 + do not declare gets
4180 + declare at_quick_exit and quick_exit also for ISO C11
4182 + aligned_alloc. NB: The code is deliberately allows the size parameter
4183 to not be a multiple of the alignment. This is a moronic requirement
4184 in the standard but it is only a requirement on the caller, not the
4187 + timespec_get added
4189 + uchar.h support added
4191 + CMPLX, CMPLXF, CMPLXL added
4193 Implemented by Ulrich Drepper.
4195 * Support for the IA-64 has been moved to ports.
4197 * Remove support for anything but ELF binary format
4199 * Checking versions of poll, ppoll added.
4200 Implemented by Ulrich Drepper.
4202 * More generic and 64-bit performance optimizations to math functions.
4203 Implemented by Ulrich Drepper.
4205 * New configure option --enable-obsolete-rpc makes the deprecated RPC
4206 headers and functions available at compile time as they were before
4207 version 2.14. This option will be removed at some time in the future
4208 after the TI-RPC library becomes fully sufficient for the needs of
4209 existing applications.
4211 * Compatibility code for Linux kernel versions before 2.4 has been removed.
4212 Note that glibc is not expected to work with any Linux kernel version
4215 * New header <sys/auxv.h> and function getauxval allowing easy access to
4216 the AT_* key-value pairs passed from the Linux kernel. The header also
4217 defines the HWCAP_* bits associated with the AT_HWCAP key.
4219 * New locales: mag_IN
4221 * New configure option --enable-systemtap builds SystemTap static probes
4222 into libc for setjmp and longjmp and into libpthread for various operations.
4223 So far the setjmp/longjmp probes and some of the libpthread probes are
4224 provided only for i*86 and x86_64.
4225 Implemented by Roland McGrath and Rayson Ho.
4227 * Optimized expf for x86-32 and x86-64. Implemented by Liubov Dmitrieva.
4229 * More optimized functions for PowerPC. Implemented by Adhemerval Zanella
4232 * More optimized functions for SPARC. Implemented by David S. Miller.
4234 * Improved support for cross-compilation, especially bootstrap builds
4235 without a previously built glibc.
4237 * Ports for the TILE-Gx and TILEPro families of processors. Contributed by
4238 Chris Metcalf from Tilera.
4240 * Support for the old ARM ABI has been removed from ports. Only the EABI is
4241 now supported for ARM processors.
4243 * The hard-float variant of the ARM EABI now uses /lib/ld-linux-armhf.so.3
4244 as the name of the dynamic linker, to distinguish it from the
4245 /lib/ld-linux.so.3 dynamic linker used for the base EABI.
4247 * Support for CRIS has been removed from ports.
4249 * A new class of installed header has been documented for low-level
4250 platform-specific functionality. PowerPC added the first instance with a
4251 function to provide time base register access. Contributed by Tulio
4252 Magno Quites Machado Filho.
4254 * ix86 configurations now install header files that are consistent with
4255 what x86-64 configurations install. These same header files can be used
4256 for -m32, -m64, or -mx32 builds.
4257 Contributed by H.J. Lu.
4259 * Math library bug fixes. A thorough audit of all open math library bugs was
4260 conducted by Joseph Myers. Significant progress was made on many math
4261 library bugs resulting in more accurate exceptions and function results.
4262 Many thanks to all those that contributed including Andreas Jaeger for his
4263 patch review and work on the x87 trigonometric instruction issues.
4265 * Timezone data is no longer installed. Timezone-related binaries and scripts
4266 will continue to be installed. Users should obtain their timezone data from
4267 their distribution provider or from the tzdata package at
4268 <ftp://munnari.oz.au/pub/>.
4272 * The following bugs are resolved with this release:
4274 6779, 6783, 9696, 10103, 10709, 11589, 11929, 12403, 12786, 12840, 12847,
4275 12868, 12852, 12874, 12885, 12892, 12906, 12907, 12922, 12935, 12962,
4276 13007, 13021, 13061, 13062, 13067, 13068, 13085, 13088, 13090, 13092,
4277 13096, 13114, 13118, 13123, 13134, 13138, 13147, 13150, 13166, 13179,
4278 13185, 13189, 13192, 13268, 13276, 13282, 13291, 13305, 13328, 13335,
4279 13337, 13344, 13358, 13367, 13413, 13416, 13423, 13439, 13446, 13472,
4280 13484, 13506, 13515, 13523, 13524, 13538, 13540
4282 * New program pldd to list loaded object of a process
4283 Implemented by Ulrich Drepper.
4285 * Add nss_db support back to glibc. No more dependency on Berkeley db
4286 and support for initgroups lookups.
4287 Implemented by Ulrich Drepper.
4289 * Optimized strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-32.
4290 Contributed by HJ Lu.
4292 * Improved strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-64.
4293 Contributed by HJ Lu.
4295 * Optimized strcat, strncat on x86-64 and optimized wcscmp, wcslen, strnlen
4296 on x86-32 and x86-64.
4297 Contributed by Liubov Dmitrieva.
4299 * Optimized strchr and strrchr for SSE on x86-32.
4300 Contributed by Liubov Dmitrieva.
4302 * Optimized memchr, memrchr, rawmemchr, memcmp, wmemcmp, wcschr, wcscpy
4303 for x86-64 and x86-32.
4304 Contributed by Liubov Dmitrieva.
4306 * New interfaces: scandirat, scandirat64
4307 Implemented by Ulrich Drepper.
4309 * Checking versions of FD_SET, FD_CLR, and FD_ISSET added.
4310 Implemented by Ulrich Drepper.
4312 * nscd now also caches the netgroup database.
4313 Implemented by Ulrich Drepper.
4315 * Integrate libm with gcc's -ffinite-math-only option.
4316 Implemented by Ulrich Drepper.
4318 * Lots of generic, 64-bit, and x86-64-specific performance optimizations
4319 to math functions. Implemented by Ulrich Drepper.
4321 * Optimized strcasecmp and strncasecmp for AVX on x86-64.
4322 Implemented by Ulrich Drepper.
4324 * New Linux interfaces: process_vm_readv, process_vm_writev
4326 * Optimized strcasecmp and strncasecmp for SSSE3 and SSE4.2 on x86-32.
4327 Implemented by Ulrich Drepper.
4329 * Optimized nearbyint and strcasecmp for PPC.
4330 Implemented by Adhemerval Zanella.
4332 * New locales: bho_IN, unm_US, es_CU, ta_LK
4336 * The following bugs are resolved with this release:
4338 386, 6420, 7101, 9730, 9732, 9809, 10138, 10149, 10157, 11099, 11257,
4339 11258, 11487, 11532, 11558, 11578, 11634, 11653, 11668, 11697, 11724,
4340 11781, 11799, 11820, 11837, 11857, 11884, 11892, 11895, 11901, 11945,
4341 11947, 11952, 11987, 12052, 12083, 12158, 12178, 12200, 12346, 12350,
4342 12393, 12420, 12432, 12445, 12449, 12453, 12454, 12460, 12469, 12489,
4343 12509, 12510, 12511, 12518, 12527, 12541, 12545, 12551, 12582, 12583,
4344 12587, 12597, 12601, 12611, 12625, 12626, 12631, 12650, 12653, 12655,
4345 12660, 12671, 12681, 12684, 12685, 12711, 12713, 12714, 12717, 12723,
4346 12724, 12734, 12738, 12746, 12766, 12775, 12777, 12782, 12788, 12792,
4347 12795, 12811, 12813, 12814, 12841
4349 * The RPC implementation in libc is obsoleted. Old programs keep working
4350 but new programs cannot be linked with the routines in libc anymore.
4351 Programs in need of RPC functionality must be linked against TI-RPC.
4352 The TI-RPC implementation is IPv6 enabled and there are other benefits.
4354 Visible changes of this change include (obviously) the inability to link
4355 programs using RPC functions without referencing the TI-RPC library and the
4356 removal of the RPC headers from the glibc headers.
4357 Implemented by Ulrich Drepper.
4359 * New Linux interfaces: clock_adjtime, name_to_handle_at, open_by_handle_at,
4360 syncfs, setns, sendmmsg
4362 * New locales: os_RU, bem_ZA, en_ZA, ff_SN, sw_KE, sw_TZ, lb_LU, wae_CH,
4363 yue_HK, lij_IT, mhr_RU
4365 * New encodings: CP770, CP771, CP772, CP773, CP774
4367 * New program sotruss to trace calls through PLTs
4368 Implemented by Ulrich Drepper.
4370 * The malloc hook implementation is marked deprecated and will be removed
4371 from the default implementation in the next version. The design never
4372 worked ever since the introduction of threads. Even programs which do
4373 not create threads themselves can use multiple threads created internally.
4377 * The following bugs are resolved with this release:
4379 3268, 6812, 7066, 10085, 10484, 10563, 10851, 11149, 11155, 11577, 11611,
4380 11640, 11655, 11701, 11840, 11856, 11883, 11903, 11904, 11968, 11979,
4381 12005, 12037, 12067, 12077, 12078, 12092, 12093, 12107, 12108, 12113,
4382 12140, 12159, 12167, 12191, 12194, 12201, 12204, 12205, 12207, 12348,
4385 * New Linux interfaces: prlimit, prlimit64, fanotify_init, fanotify_mark
4387 * POWER7 optimizations: memset, memcmp, strncmp
4389 * New optimized string functions for x86-64: strnlen (SSE2),
4390 strcasecmp (SSE2, SSSE3, SSE4.2), strncasecmp (SSE2, SSSE3, SSE4.2)
4391 Implemented by Ulrich Drepper.
4395 * The following bugs are resolved with this release:
4397 3662, 4457, 5553, 10162, 10401, 10414, 10554, 10824, 10864, 10915,
4398 10918, 10936, 10939, 10958, 10968, 10969, 10972, 10992, 11000, 11001,
4399 11007, 11010, 11027, 11039, 11040, 11041, 11043, 11046, 11056, 11070,
4400 11093, 11115, 11125, 11126, 11127, 11134, 11141, 11149, 11183, 11184,
4401 11185, 11186, 11187, 11188, 11189, 11190, 11191, 11192, 11193, 11194,
4402 11200, 11230, 11235, 11242, 11254, 11258, 11271, 11272, 11276, 11279,
4403 11287, 11292, 11319, 11332, 11333, 11387, 11389, 11390, 11394, 11397,
4404 11410, 11438, 11449, 11470, 11471, 11520, 11537, 11538, 11571
4406 * New interfaces: pthread_getname_np, pthread_setname_np
4408 * New Linux interface: recvmmsg
4410 * STT_GNU_IFUNC implemented for Sparc by David Miller.
4412 * The dynamic linker now recognizes supported ABI versions from the
4413 EI_ABIVERSION field in the ELF header.
4414 Implemented by Ulrich Drepper.
4416 * New NIS mode selector ADJUNCT_AS_SHADOW. The passwd.adjunct.byname table
4417 will not be used to fill in password fields in the passwd.byname replies.
4418 Instead it is used to synthesize the shadow.byname table, should it be
4419 missing. This is a useful mode in some installations involving Solaris.
4420 Implemented by Ulrich Drepper.
4422 * New locales: kok_IN, sq_MK, cv_RU
4426 * The following bugs are resolved with this release:
4428 3270, 7094, 9924, 9986, 10011, 10085, 10107, 10159, 10162, 10166, 10183,
4429 10195, 10196, 10200, 10203, 10207, 10211, 10213, 10217, 10221, 10229,
4430 10262, 10286, 10312, 10315, 10319, 10349, 10360, 10391, 10402, 10416,
4431 10418, 10422, 10425, 10446, 10448, 10452, 10540, 10553, 10560, 10564,
4432 10609, 10643, 10692, 10713, 10717, 10730, 10731, 10742, 10780, 10784,
4433 10789, 10817, 10823, 10840, 10847
4435 * New interfaces: execvpe, pthread_sigqueue, mkstemps, mkstemps64, mkostemps,
4437 Implemented by Ulrich Drepper.
4439 * Checking version of longjmp added that fails if an uninitialized stack
4440 frame would be created. Implemented by Ulrich Drepper.
4442 * STT_GNU_IFUNC is now supported in static executables.
4443 Implemented by H.J. Lu.
4445 * STT_GNU_IFUNC implemented for PPC by Alan Modra.
4447 * New optimized string functions for x86-64: strstr, strcasestr, memcmp,
4448 strcspn, strpbrk, strspn, strcpy, stpcpy, strncpy, strcmp (SSE2, SSE4.2),
4449 strncmp (SSE2, SSE4.2), strchr (SSE4.2), strrchr (SSE4.2).
4450 Contributed by H.J. Lu.
4452 strlen, rawmemchr, strcmp (SSSE3), strncmp (SSSE3).
4453 Implemented by Ulrich Drepper.
4455 * New optimized string functions for x86: strlen, strcspn, strspn, strpbrk,
4457 Contributed by H.J. Lu.
4459 * Support for fma instruction in AVX on x86-64.
4460 Implemented by H.J. Lu and Ulrich Drepper.
4462 * AVX support in x86-64 auditing support in ld.so.
4463 Implemented by H.J. Lu.
4465 * STB_GNU_UNIQUE support added.
4466 Implemented by Ulrich Drepper.
4468 * Implement second fallback mode for optimized DNS lookup for even more
4469 broken environments. If two requests from the same port are not
4470 handled correctly close the socket and open a new one before sending
4471 the second request. The 'single-request-reopen' option in /etc/resolv.conf
4472 can be used to select this mode right away, instead of rediscovering the
4473 necessity is every process again.
4474 Implemented by Ulrich Drepper.
4476 * New resolver flag RES_USE_DNSSEC to enable use of verified lookup.
4477 Implemented by Adam Tkac.
4479 * Optimized iconv conversions for S390x.
4480 Implemented by Andreas Krebbel.
4482 * Using condvars with PI mutexes is now more efficient due to kernel
4483 support for requeueing to PI futexes. NPTL support added for x86-64.
4484 Implemented by Ulrich Drepper.
4486 * New locales: ps_AF, my_MM
4490 * The following bugs are resolved with this release:
4492 697, 5381, 5807, 6411, 6545, 7040, 7058, 7067, 7080, 7083, 7095, 7098,
4493 9677, 9694, 9697, 9701, 9704, 9705, 9706, 9720, 9726, 9730, 9733, 9736,
4494 9741, 9750, 9753, 9759, 9781, 9791, 9793, 9823, 9833, 9844, 9880, 9881,
4495 9891, 9893, 9895, 9913, 9916, 9920, 9948, 9955, 9957, 9963, 9985, 10052,
4496 10069, 10086, 10087, 10090, 10092, 10093, 10100, 10118, 10128
4498 * New interfaces: preadv, preadv64, pwritev, pwritev64, malloc_info
4499 Implemented by Ulrich Drepper.
4501 * New Linux interfaces: accept4, fallocate, fallocate64.
4502 Implemented by Ulrich Drepper.
4504 * Correct declarations of string function when used in C++ code. This
4505 could lead to compile errors for invalid C++ code.
4507 * XPG7/POSIX 2008 compilation environment. Many GNU-specific functions are
4510 * New POSIX 2008 interface: psiginfo
4511 Implemented by Ulrich Drepper.
4513 * New ISO C++1x interfaces: quick_exit, at_quick_exit
4514 Implemented by Ulrich Drepper.
4516 * Support for selecting between multiple function definitions at runtime
4517 using STT_GNU_IFUNC symbols. Implemented by Ulrich Drepper.
4519 * The libcrypt library can now use the hash function implementations in
4520 NSS. Implemented by Ulrich Drepper.
4522 * The malloc implementation can be compiled to be less memory efficient
4523 but higher performing in multi-threaded programs.
4524 Implemented by Ulrich Drepper.
4526 * New locales: nan_TW@latin, ks_IN
4528 * Faster strlen, strchr, strchrnul, strrchr, memchr, and rawmemchr for x86-64.
4529 Implemented by Ulrich Drepper.
4531 * Extended printf hook support. It is possible to use user-defined types
4532 and extend existing format specifiers.
4533 Implemented by Ulrich Drepper.
4535 * Handling for group shadow files has been added.
4536 Implemented by Ulrich Drepper.
4538 * DNS IPv4-IPv6 parallel lookup now deals better with broken DNS
4539 servers (the case, e.g., for some people using the built-in DNS
4540 server in ADSL modems/routers). There is a once-per-process timeout
4541 in case of a broken server. To avoid it, users can run nscd or put
4542 'options single-request' in /etc/resolv.conf.
4543 Implemented by Ulrich Drepper.
4547 * The following bugs are resolved with this release:
4549 3406, 5209, 5210, 5381, 5794, 5814, 5911, 6428, 6438, 6442, 6447, 6461,
4550 6472, 6505, 6544, 6589, 6612, 6634, 6653, 6654, 6657, 6698, 6712, 6713,
4551 6719, 6723, 6724, 6740, 6763, 6771, 6790, 6791, 6817, 6824, 6839, 6843,
4552 6845, 6856, 6857, 6860, 6867, 6875, 6919, 6920, 6942, 6947, 6955, 6966,
4553 6968, 6974, 6980, 6995, 7008, 7009, 7029
4555 * Unified lookup for getaddrinfo: IPv4 and IPv6 addresses are now looked
4556 up at the same time. Implemented by Ulrich Drepper.
4558 * TLS descriptors for LD and GD on x86 and x86-64.
4559 Implemented by Alexandre Oliva.
4561 * getaddrinfo now handles DCCP and UDPlite.
4562 Implemented by Ulrich Drepper.
4564 * New fixed-size conversion macros: htobe16, htole16, be16toh, le16toh,
4565 htobe32, htole32, be32toh, le32toh, htobe64, htole64, be64toh, le64toh.
4566 Implemented by Ulrich Drepper.
4568 * New implementation of memmem, strstr, and strcasestr which is O(n).
4569 Implemented by Eric Blake.
4571 * New Linux interfaces: inotify_init1, dup3, epoll_create1, pipe2
4573 * Implement "e" option for popen to open file descriptor with the
4574 close-on-exec flag set. Implemented by Ulrich Drepper.
4576 * Implement "b" mode for fmemopen. In this mode writes writes don't
4577 implicitly add a NUL byte and seeks from the end of the buffer really
4578 use the buffer end, not the string length as the basis.
4579 Implemented by Ulrich Drepper.
4581 * Many functions, exported and internal, now atomically set the close-on-exec
4582 flag when run on a sufficiently new kernel. Implemented by Ulrich Drepper.
4584 * Sorting rules for some Indian languages (Kannada, Gurumukhi, Telugu,
4586 Implemented by Pravin Satpute.
4588 * New locales: sd_IN, sd_IN@devanagari, ks_IN@devanagari, ht_HT, en_AG, nl_AW.
4592 * The following bugs are resolved with this release:
4594 2549, 3112, 4314, 4407, 4997, 5012, 5040, 5112, 5204, 5208, 5209, 5220,
4595 5222, 5224, 5225, 5237, 5238, 5240, 5245, 5277, 5346, 5375, 5378, 5382,
4596 5424, 5427, 5428, 5435, 5436, 5439, 5441, 5442, 5443, 5451, 5452, 5454,
4597 5455, 5463, 5464, 5465, 5475, 5477, 5478, 5520, 5541, 5545, 5553, 5600,
4598 5602, 5607, 5614, 5627, 5628, 5736, 5737, 5741, 5753, 5760, 5762, 5768,
4599 5774, 5777, 5778, 5779, 5786, 5790, 5818, 5854, 5857, 5903, 5939, 5979,
4600 5983, 5995, 5998, 6004, 6007, 6020, 6021, 6024, 6040, 6042
4602 * New locales: bo_CN, bo_IN, shs_CA.
4604 * New encoding: HP-ROMAN9, HP-GREEK8, HP-THAI8, HP-TURKISH8.
4606 * Sorting rules for some Indian languages (Devanagari and Gujarati).
4607 Implemented by Pravin Satpute.
4609 * IPV6 addresses in /etc/resolv.conf can now have a scope ID
4611 * nscd caches now all timeouts for DNS entries
4612 Implemented by Ulrich Drepper.
4614 * nscd is more efficient and wakes up less often.
4615 Implemented by Ulrich Drepper.
4617 * More checking functions: asprintf, dprintf, obstack_printf, vasprintf,
4618 vdprintf, and obstack_vprintf.
4619 Implemented by Jakub Jelinek.
4621 * Faster memset for x86-64.
4622 Implemented by Harsha Jagasia and H.J. Lu.
4624 * Faster memcpy on x86.
4625 Implemented by Ulrich Drepper.
4627 * ARG_MAX is not anymore constant on Linux. Use sysconf(_SC_ARG_MAX).
4628 Implemented by Ulrich Drepper.
4630 * Faster sqrt and sqrtf implemention for some PPC variants.
4631 Implemented by Steven Munroe.
4635 * The following bugs are resolved with this release:
4637 4125, 4126, 4178, 4359, 4407, 4512, 4514, 4525, 4554, 4556, 4557, 4566,
4638 4582, 4586, 4588, 4599, 4610, 4647, 4702, 4705, 4726, 4745, 4772, 4773,
4639 4775, 4776, 4792, 4813, 4814, 4816, 4833, 4858, 4860, 4896, 4905, 4925,
4640 4936, 4937, 4938, 4941, 4946, 4963, 4972, 5010, 5028, 5043, 5058, 5063,
4641 5071, 5103, 5104, 5112, 5113, 5184, 5186
4643 * More checking functions: fread, fread_unlocked, open*, mq_open.
4644 Implemented by Jakub Jelinek and Ulrich Drepper.
4646 * Extend fortification to C++. Implemented by Jakub Jelinek.
4648 * Implement 'm' modifier for scanf. Add stricter C99/SUS compliance
4649 by not recognizing 'a' as a modifier when those specs are requested.
4650 Implemented by Jakub Jelinek.
4652 * PPC optimizations to math and string functions.
4653 Implemented by Steven Munroe.
4655 * New interfaces: mkostemp, mkostemp64. Like mkstemp* but allow additional
4656 options to be passed. Implemented by Ulrich Drepper.
4658 * More CPU set manipulation functions. Implemented by Ulrich Drepper.
4660 * New Linux interfaces: signalfd, eventfd, eventfd_read, and eventfd_write.
4661 Implemented by Ulrich Drepper.
4663 * Handle private futexes in the NPTL implementation.
4664 Implemented by Jakub Jelinek and Ulrich Drepper.
4666 * Add support for O_CLOEXEC. Implement in Hurd. Use throughout libc.
4667 Implemented by Roland McGrath and Ulrich Drepper.
4669 * Linux/x86-64 vDSO support. Implemented by Ulrich Drepper.
4671 * SHA-256 and SHA-512 based password encryption.
4672 Implemented by Ulrich Drepper.
4674 * New locales: ber_DZ, ber_MA, en_NG, fil_PH, fur_IT, fy_DE, ha_NG, ig_NG,
4675 ik_CA, iu_CA, li_BE, li_NL, nds_DE, nds_NL, pap_AN, sc_IT, tk_TM, ug_CN,
4678 + New iconv modules: MAC-CENTRALEUROPE, ISO-8859-9E, KOI8-RU.
4679 Implemented by Ulrich Drepper.
4683 * The following bugs are resolved with this release:
4685 3156, 3213, 3285, 3291, 3306, 3313, 3320, 3322, 3325, 3326, 3334, 3348,
4686 3352, 3363, 3369, 3426, 3427, 3429, 3451, 3458, 3465, 3480, 3483, 3493,
4687 3514, 3515, 3559, 3632, 3664, 3673, 3674, 3745, 3747, 3818, 3840, 3842,
4688 3851, 3855, 3884, 3885, 3902, 3905, 3919, 3944, 3954, 3955, 3957, 3991,
4689 3995, 3996, 4024, 4040, 4069, 4070, 4074, 4076, 4096, 4101, 4102, 4114,
4690 4130, 4131, 4181, 4276, 4306, 4342, 4344, 4349, 4364, 4368, 4381, 4392,
4691 4403, 4405, 4406, 4411, 4438, 4439, 4455, 4456, 4465, 4512, 4514, 4586,
4694 * New Linux interfaces: epoll_pwait, sched_getcpu.
4696 * New generic interfaces: strerror_l.
4698 * nscd can now cache the services database. Implemented by Ulrich Drepper.
4702 * The following bugs are resolved with this release:
4704 39, 68, 192, 352, 388, 531, 935, 1006, 1201, 1203, 1386, 1782, 1783, 1784,
4705 1785, 1786, 1787, 1951, 1974, 1996, 2072, 2098, 2125, 2134, 2158, 2182,
4706 2349, 2376, 2386, 2389, 2415, 2418, 2420, 2423, 2450, 2451, 2466, 2472,
4707 2473, 2477, 2498, 2499, 2501, 2502, 2505, 2507, 2508, 2509, 2517, 2526,
4708 2569, 2571, 2592, 2611, 2625, 2632, 2644, 2662, 2680, 2683, 2684, 2693,
4709 2695, 2703, 2734, 2751, 2764, 2766, 2775, 2792, 2821, 2823, 2832, 2841,
4710 2843, 2883, 2892, 2908, 2914, 2926, 2961, 2978, 2980, 2987, 2997, 2998,
4711 3013, 3018, 3034, 3040, 3044, 3123, 3124, 3137, 3138, 3143, 3155, 3189,
4712 3225, 3251, 3252, 3253, 3273
4714 * For Linux, the sorting of addresses returned by getaddrinfo now also
4715 handles rules 3, 4, and 7 from RFC 3484. I.e., all rules are handled.
4716 Implemented by Ulrich Drepper.
4718 * Allow system admin to configure getaddrinfo with the /etc/gai.conf file.
4719 Implemented by Ulrich Drepper.
4721 * New Linux interfaces: splice, tee, sync_file_range, vmsplice.
4723 * New iconv module for MIK. Contributed by Alexander Shopov.
4725 * For sites with broken group and/or passwd database, the auto-propagate
4726 option of nscd can prevent creating ID lookup entries from the results
4727 of a name lookup and vice versa. This usually is no problem but some
4728 site might have problems with the default behavior.
4729 Implemented by Ulrich Drepper.
4731 * Iterating over entire database in NIS can be slow. With the
4732 SETENT_BATCH_READ option in /etc/default/nss a system admin can decide
4733 to trade time for memory. The entire database will be read at once.
4734 Implemented by Ulrich Drepper.
4736 * The interfaces introduced in RFC 3542 have been implemented by
4739 * Support for the new ELF hash table format was added by Ulrich Drepper.
4741 * Support for priority inheritance mutexes added by Jakub Jelinek and
4744 * Support for priority protected mutexes added by Jakub Jelinek.
4746 * New locales: nr_ZA, pa_PK, ca_AD, ca_FR, ca_IT, el_CY, tr_CY, as_IN,
4747 or_IN, csb_PL, fy_NL, sr_ME.
4751 * More overflow detection functions.
4753 * New iconv converters for IBM1025, IBM1122, IBM1137, IBM1153,
4754 IBM1154, IBM1155, IBM1156, IBM1157, and IBM1158 contributed by Jiro Sekiba.
4756 More converters for IBM803, IBM901, IBM902, IBM921, IBM1008, IBM1097,
4757 IBM1112, IBM1123, IBM1130, IBM1140, IBM1141, IBM1142, IBM1143, IBM1144,
4758 IBM1145, IBM1146, IBM1147, IBM1148, IBM1149, IBM1166, IBM1167, IBM4517,
4759 IBM4899, IBM4909, IBM4971, IBM5347, IBM9030, IBM9066, IBM9448, IBM12712,
4760 IBM16804, IBM1364, IBM1371, IBM1388, IBM1390, and IBM1399 contributed
4761 by Masahide Washizawa.
4763 * It is now possible to install audit libraries for the dynamic linker using
4764 LD_AUDIT. Implemented by Ulrich Drepper.
4766 * The LinuxThreads add-on, providing pthreads on Linux 2.4 kernels, is no
4767 longer supported. The new NPTL implementation requires Linux 2.6 kernels.
4768 For a libc and libpthread that works well on Linux 2.4 kernels, we
4769 recommend using the stable 2.3 branch.
4771 * The new function open_wmemstream acts like open_memstream,
4772 but uses a wchar_t wide character buffer.
4774 * The new function ppoll is an improved version of poll, similar to pselect.
4776 * New interfaces: fdopendir, openat, fstatat, fchmodat, fchownat,
4777 futimesat, faccessat, mkdirat, mkfifoat, mknodat,
4778 renameat, unlinkat, linkat, symlinkat, readlinkat.
4780 * New Linux kernel system calls: unshare,
4781 inotify_init, inotify_add_watch, inotify_rm_watch.
4783 * The euidaccess function is now also known by the alias eaccess,
4784 for compatibility with some other systems.
4786 * Timezone data updated to 2006b version.
4790 * The following bugs are resolved with this release:
4792 38, 253, 549, 622, 653, 721, 758, 851, 877, 915, 934, 955, 961,
4793 1016, 1037, 1076, 1079, 1080, 1081, 1082, 1083, 1084, 1085, 1086,
4794 1087, 1088, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098,
4795 1099, 1100, 1101, 1102, 1103, 1104, 1105, 1106, 1107, 1108, 1109,
4796 1110, 1111, 1112, 1113, 1125, 1137, 1138, 1249, 1250, 1251, 1252,
4797 1253, 1254, 1350, 1358, 1394, 1438, 1498, 1534
4799 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
4801 * As of this release, GCC 4 can be used to compile the C Library.
4803 * Timezone data updated to 2005m version.
4807 * The following bugs are resolved with this release:
4809 284, 592, 602, 626, 633, 640, 650, 661, 671, 681, 693, 700, 710, 719,
4810 722, 723, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736,
4811 737, 738, 739, 740, 741, 742, 743, 744, 745, 765, 767, 768, 769, 776,
4812 777, 787, 821, 822, 823, 825
4814 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
4818 * Support for RFC 3678. Real implementations exist only for Linux so far.
4819 Implemented by Ulrich Drepper.
4821 * nscd can now cache entries persistently. Expiring entries are reloaded.
4822 For speedups the cache can be shared in memory with client processes.
4823 Implemented by Ulrich Drepper.
4825 * nscd can now perform SELinux checks.
4826 Implemented by Matthew Rickard <mjricka@epoch.ncsc.mil>.
4828 * getaddrinfo queries are now cached. Canonical name lookup is performed
4830 Implemented by Ulrich Drepper.
4832 * The nothrow function attribute is used when headers are used by gcc when
4833 compiling C code. This can avoid significant amounts of exception
4836 * The malloc functions perform more error checking and are stricter when
4837 it comes to reacting on errors. The default action is to terminate
4838 the process after showing an error message. Implemented by Ulrich Drepper.
4840 * Reverse lookups of IPv6 addresses does not use bit string or .ip6.int
4841 lookups anymore unless explicitly requested. Implemented by Ulrich Drepper.
4843 * Namespaces in ld.so are implemented. DSOs can be loaded in separate
4844 namespaces using the new function dlmopen(). This feature is of course,
4845 like most other dynamic loading functionality, not available in statically
4846 linked applications. Implemented by Ulrich Drepper.
4848 * Low-overhead boundary checking variants of string and some stdio functions
4849 were added. These are to be used in conjunction with a gcc patch by
4850 Jakub Jelinek which adds calls to these functions if possible.
4851 Implemented by Jakub Jelinek and Ulrich Drepper.
4853 * Old code for several operating systems and machine architectures that
4854 have not been in working condition in a long time have been removed from
4855 the main source tree maintained by the GNU C Library's maintainers.
4856 These files are now reside in the separate `ports' source module
4857 that is usable as an add-on when building the library.
4861 * New functions `dladdr1' and `dlinfo' in <dlfcn.h> provide more ways to
4862 interrogate the dynamic linker, compatible with the Solaris interface.
4864 * ELF thread-local storage support (TLS) now works on PowerPC and PowerPC64;
4865 implemented by Paul Mackerras, Steven Munroe, and Roland McGrath.
4867 * getifaddrs now uses the netlink interface on Linux to get its information.
4868 Implemented by Thorsten Kukuk.
4870 * getaddrinfo now implements AI_V4MAPPED, AI_ALL, and AI_ADDRCONF.
4871 Implemented by Ulrich Drepper.
4873 * support for non-executable stacks on x86 has been added. Changes mostly
4876 * regex is now much faster for multibyte locales. Changes by Jakub Jelinek
4879 * getaddrinfo now performs destination address selection according to
4884 * Thread-safe interfaces for many functions that access locale data
4885 were added in version 2.3, but these features were omitted from NEWS.
4886 Many functions have variants with an `_l' suffix that take a `locale_t'
4887 object as a parameter rather than consulting the current locale.
4888 The new functions `newlocale', `duplocale', and `freelocale' in <locale.h>
4889 create and maintain `locale_t' objects. Additionally, the new function
4890 `uselocale' sets "the current locale" (as used by functions not so
4891 parameterized) set for an individual thread. These features were added
4892 in version 2.3, implemented by Ulrich Drepper and Roland McGrath.
4894 * The functions getresuid, getresgid, setresuid, and setresgid, which
4895 have long been available on Linux, are now declared in <unistd.h>
4896 and are now also available on the Hurd.
4898 * ELF thread-local storage support (TLS) now works on x86-64.
4900 * The new dynamic string token $LIB is expanded in shared library names.
4901 This normally expands to lib, but on some 64-bit platforms to lib64 instead.
4903 * Aldy Hernandez contributed complete software floating point support for
4904 PowerPC machines with no FPU.
4906 * fexecve is implemented on Linux.
4908 * The `btowc' function should work at least twice as fast due to
4909 specialized callbacks in the iconv modules. Implemented by Bruno Haible.
4911 * With approriate thread add-ons cancelable functions are now implemented
4912 in libc.so as well. No need to call the function in libpthread. This
4913 change allowed to finally disable the incorrect and expensive handling
4914 of weak definition in ld.so.
4916 * Yet more PLT entries in libc.so have been removed. We finally arrived
4917 at the bare minimum. Startup times improved appropriately.
4919 * Support for the new Linux/x86 system call interface was added. The
4920 AT_SYSINFO auxiliary vector entry is recognized and handled.
4924 * Masahide Washizawa contributed iconv modules for IBM1163 and IBM1164
4927 * iconv (the program and the interface) now accepts empty names (excluding
4928 options like //TRANSLIT) to mean "use charset of current locale".
4930 * localedef can now transliterate characters in strings which are not in
4931 the provided charmap. The information from the input locale is used.
4933 * Prelinking support was added for ELF targets. This requires additional
4934 tools and recent versions of the GNU binutils. Contributed by Jakub Jelinek.
4936 * Read-only stdio streams now use mmap to speed up operation by eliminating
4937 copying and buffer underflows. To use add 'm' to the mode string of
4938 the fopen/fdopen/freopen call. Implemented by Ulrich Drepper.
4940 * The malloc functions were completely rewritten by Wolfram Gloger based
4941 on Doug Lea's malloc-2.7.0.c.
4943 * Isamu Hasegawa contributed a completely new and POSIX-conformant
4944 implementation of regex.
4946 * Bruno Haible upgraded the iconv and locale implementation to support
4949 * Contents of the LC_* and LANG environment variables in the CEN style are
4950 not recognized anymore. It never was used. Change by Ulrich Drepper.
4952 * The runtime (ld.so, libc, libpthread for Linux) now can handle the ELF
4953 thread-local storage (TLS) ABI on some platforms.
4954 Changes by Ulrich Drepper. SH support by Kaz Kojima.
4956 * Bruno Haible contributed iconv converters for ISO-2022-JP-3, SHIFT JIS-X0213,
4957 EUC-JISX0213, and TSCII.
4959 * New header <ifaddrs.h> with functions `getifaddrs' and `freeifaddrs':
4960 BSD-compatible interface for getting all network interface addresses.
4961 Implementation for IPv4 by Roland McGrath.
4963 * Loading of locale data is faster due to the introduction of a locale
4964 archive. Implemented by Roland McGrath and Ulrich Drepper.
4966 * Startup times are significantly reduced by not using exported functions
4967 inside the library itself. Changes by Jakub Jelinek, Roland McGrath,
4970 * Steven Munroe contributed a port to PowerPC64/Linux.
4974 * The Hurd now uses the GNU libio implementation of stdio rather than the
4975 old GNU stdio implementation, and uses a new ABI (libc.so.0.3).
4977 * The Hurd on x86 now has the `ioperm' function and <sys/io.h> header file
4978 with the same behavior as the Linux system call of the same name.
4982 * Stephen Moshier implemented log2, log10, powl and cbrtl for the
4983 128-bit long double format.
4985 * Masahide Washizawa contributed iconv modules for IBM1132, IBM1133, IBM1160,
4986 IBM1161, and IBM1162 charsets.
4988 * Andreas Jaeger contributed a port to x86-64/Linux.
4990 * Peter Bruin contributed a port to PowerPC/Hurd.
4992 * libc functions using I/O streams now can handle wide-oriented streams
4995 * optimizations in the dynamic linker. Binaries created by recent binutils
4996 versions start up quicker due to reduced time spent on relocations.
4998 * Support for use of gcc3 added by Jakub Jelinek and HJ Lu.
5002 * Stephen Moshier implemented cosh, expm1, log1p, acos, sinh, tanh,
5003 asinh, atanh, j0 for the 128-bit long double format.
5005 * Bruno Haible updated all the code handling Unicode in some form to
5006 support Unicode 3.1.
5008 * Speed of regex for single-byte locales is back to previous levels.
5009 Patch by Isamu Hasegawa.
5011 * Alpha, SPARC, and IA-64 now also using floating stacks.
5013 * Startup time of internationalized applications greatly improved through
5014 iconv cache. Use iconvconfig to generate the cache file.
5015 Contributed by Ulrich Drepper.
5017 * The IA-64 specific part of ld.so was rewritten to eliminate some pretty
5018 severe performance problems. Patch by David Mosberger.
5020 * The Hurd port got a lot more functionality like AIO, various stdio
5021 extensions, etc. Mainly done by Roland McGrath.
5023 * mtrace can now lookup symbols in shared libraries.
5027 * Intel's IA-64 math library is largely integrated. It provides fast and
5028 accurate implementatations for most basic and standard math functions
5029 in float, double, and long double format.
5031 * Stephen Moshier implemented j0, j1, jn, y0, y1, yn, lgamma, erf, erfc,
5032 and asin for the 96-bit long double format and asin, log, tan for the
5033 128-bit long double format.
5035 * The beginning of a last-bit accurate math library by IBM Haifa were added.
5036 The basic double functions exist today. Contributed by Abraham Ziv
5037 <ziv@il.ibm.com>, Moshe Olshansky <olshansk@il.ibm.com>, Ealan Henis
5038 <ealan@il.ibm.com>, and Anna Reitman <reitman@il.ibm.com>.
5040 * An asynchronous name lookup library was added. The interface is designed
5041 after POSIX AIO. The proposal was circulated beforehand to get comments.
5042 No negative ones came in. Implemented by Ulrich Drepper.
5044 * Port to S390/64bit contributed by Martin Schwidefsky
5045 <schwidefsky@de.ibm.com>.
5047 * David Mosberger <davidm@hpl.hp.com> implemented the setcontext family
5048 of functions for Linux/IA-64.
5050 * The RPC code is now thread safe. Threads can now use the same service
5051 of different services at the same time. Patch by Eric Norum
5052 <eric.norum@usask.ca> with some help by Ulrich Drepper.
5054 * Martin Schwidefsky <schwidefsky@de.ibm.com> implemented the setcontext
5055 family of functions for Linux/S390.
5057 * Ulrich Drepper <drepper@redhat.com> implemented the setcontext family
5058 of functions for Linux/x86.
5060 * Port to Linux/CRIS contributed by Axis Communications.
5064 * Lots of headers were cleaned up. Using the tool in the conform/ subdir
5065 we can now check for namespace violations and missing declarations. The
5066 result is that almost all headers are now Unix-compliant (as defined in
5067 the upcoming XPG6). The negative side is that some programs might need
5068 corrections, too, if they depend on the incorrect form of the headers in
5069 previous versions which defined too many symbols and included too many
5072 * regex now handles multibyte character sets correctly.
5073 Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>.
5075 * iconv (the program) does now conform to the upcoming XPG6 and handles
5076 charmaps. Instead of the charset names the path of charmaps can be
5077 provided and the conversion happens based on this data.
5078 Contributed by Ulrich Drepper.
5080 * The locale program now provides detailed information about the installed
5085 only lists the names of the supported locales
5089 provides details such as country, language, and codeset name.
5090 Contributed by Ulrich Drepper.
5094 * The gencat program now parses the input file according to the charset
5095 selected by the LC_CTYPE category. This is important for stateful
5096 character sets. To make generating catalogs easier there is a way
5097 to overwrite the charset selected by the locale: before the first
5098 message or $ quote line the catalog can contain a line like
5100 $ codeset=ISO-8859-2
5102 to select the charset (ISO-8859-2 in this case).
5104 Implemented by Shinya Hanataka and Ulrich Drepper.
5106 * New codeset conversion modules: IBM-922 (Estonia PC codeset),
5107 IBM-1124 (Ukraine PC codeset), IBM-1129 (Vietnamese PC codeset).
5108 Contributed by Masahide Washizawa <washi@jp.ibm.com>.
5110 * Optimized string functions for Alpha ev6 and ev67 by Richard Henderson
5111 <rth@redhat.com> and Rick Gorton <rick.gorton@alpha-processor.com>.
5113 * The LANGUAGE environment variable is now ignored unless the locale is
5114 changed from the default "C" locale.
5116 * The usual bug fixes.
5120 * Greg McGary added runtime support for bounds checking using gcc's
5121 new -fbounded-pointers option. ix86 target is complete. PowerPC
5124 * Thorsten Kukuk added secure mode support to nscd.
5126 * The Berkeley db libraries have been removed.
5128 Related, the nss_db module is now in a separate package since it
5129 obviously requires a database library being available.
5131 * Wide character I/O streams implemented by Ulrich Drepper.
5133 * Functions from the extended socket API added by Ulrich Drepper.
5135 * Functions feenableexcept and fedisableexcept to control the
5136 behaviour of individual exceptions have been added by Andreas Jaeger.
5138 * ldconfig program added by Andreas Jaeger and Jakub Jelinek.
5140 * The resolver code has been updated from bind 8.2.3-T5B which supports
5141 threads. The integration was done by Andreas Jaeger, Adam D. Bradley,
5144 This change could in some situations effect backward compatibility. Since
5145 now `_res' is a thread-local instead of a global variable, modifying it
5146 in one thread does not have any effect in other threads.
5148 The resolver library was also extended to allow IPv6 as the transport
5149 protocol for the requests. This work was done by Stig Venaas.
5151 * Compatibility code for K&R C compilers has been removed from the
5152 header files. A ISO C compiler is needed to use the library
5153 (conforming to either C89 or C99 standard).
5155 * Complete rewrite of the localedef program to support multibyte character
5156 sets. Implement handling of ISO 14651 and ISO 14652. Rewrite strcoll,
5157 strxfrm, wcscoll, and wcsxfrm functions. Make isw*() functions work.
5158 Implemented by Ulrich Drepper.
5160 Bruno Haible significantly improved the generation and use of the data
5161 structures for the wide character tables.
5163 * Plural handling in gettext implemented by Ulrich Drepper.
5165 * The utmp daemon has been removed.
5167 * The port to MIPS-Linux has been finished by Andreas Jaeger.
5169 * A port to Hitachi SH3 and SH4 has been contributed by Kazumoto Kojima
5172 * POSIX clocks and timers implemented by Kaz Kylheku and Ulrich Drepper.
5174 * POSIX barriers implemented by Kaz Kylheku.
5176 * POSIX spawn function family implemented by Ulrich Drepper.
5178 * POSIX spinlocks are now available.
5180 * Timed wait functions for mutex, rwlock, and semaphores are implemented.
5182 * the configure option --enable-kernel=X.Y.Z allows to strip out
5183 compatibility for kernel versions before X.Y.Z. This is currently only
5184 implemented for Linux.
5186 * the sockaddr_in6 structure changed. The IPv6 working group added a new
5187 field sin6_scope_id. This means that all programs using IPv6 should be
5188 recompiled. Don't expect binary compatibility with previous glibc
5191 * various conversion modules for IBM character sets contributed by
5194 * IA-64 port by Jes Sorensen and HJ Lu.
5208 * New ISO C 9x function _Exit, imaxabs, and imaxdiv are added.
5210 * New xdr functions are added; some rpc functions are now 64bit clean.
5212 * Fixed a number of bugs and memory leaks (especially in NIS+ code).
5214 * Fixed known incompatibilities with glibc 2.0.
5216 * New functions lock64, strchrnul, rawmemchr, getutmp and getutmpx.
5218 * Optimized a number of functions (especially the ELF dynamic loader).
5220 * Update timezone data files.
5222 * lots of charmaps corrections
5224 * some new locale definitions and charmaps
5229 * Richard Henderson corrected size of struct timeval on Linux/Alpha to
5230 conform to POSIX member type requirements. Symbol versions have been
5231 adjusted as needed within the library, and for direct use by applications,
5232 but there is potential for problems if third-party libraries use
5233 struct timeval as part of their interface. This does not present
5234 a problem for X and other "essential" system libraries.
5236 * An additional locale model to support C++ Standard Library locale
5237 model and probably more was implemented by Ulrich Drepper.
5239 * Eric Youngdale and Ulrich Drepper implemented versioning of objects on
5242 * Miles Bader provided the `argp' function family to support hierachical
5243 command line argument parsing, layered on top of getopt.
5245 * strtod accepts new hexadecimal floating-point format from ISO C 9X.
5247 * printf has two new specifiers %a and %A to print hexadecimal flaoting-point
5250 * scanf recognizes the %a and %A format for scanning floating point numbers.
5252 * the new headers <stdint.h> and <inttypes.h> from ISO C 9X provides
5253 information and interfaces for the available integer types.
5255 * about 130 new math functions were added to implement the ISO C9x math
5258 * the new header <complex.h> contains definitions of the complex math
5259 functions from ISO C 9X.
5261 * the new header <tgmath.h> defines generic macros to use complex or
5262 real valued functions.
5264 * Thorsten Kukuk provided an implementation for NIS+, securelevel 0, 1 and 2.
5266 * Andreas Jaeger provided a test suite for the math library.
5268 * Mark Kettenis implemented the utmpx interface and an utmp daemon.
5270 * Ulrich Drepper added character set conversion functions (iconv).
5272 * Optimized string functions have been added.
5274 * The localedata addon is now part of glibc.
5276 * An implementation of profiling shared libraries was added by Ulrich Drepper.
5278 * Thorsten Kukuk and Ulrich Drepper provided an implementation for a caching
5279 daemon for NSS (nscd).
5281 Missing a better place here are some numbers on improvements. Under
5282 Linux 2.1.125 un-tar-ing the kernel sources takes
5286 using local files 12.19s 6.88s 22.91s
5288 using NIS 13.92s 8.91s 26.34s
5290 using NIS & nscd 10.37s 7.34s 25.30s
5292 using NIS+ 27.57s 30.37s 640.46s
5294 using NIS+ & nscd 10.25s 7.83s 26.51s
5296 using NIS & old nscd [1] 13.83s 8.32s 29.60s
5298 Keep in mind that non-namelookup related operations dominate above times.
5299 It was just a common complain that using NIS+ unpacking the kernel is
5302 [1] The old nscd implementation is not available anymore since it was
5303 distributed with glibc up to version 2.0.98 and thus is now replaced.
5305 * Tim Waugh provided an implementation of the POSIX.2 wordexp function family.
5307 * Mark Kettenis provided a Hesiod NSS module.
5309 * The ELF dynamic loader knows how to process dynamic string tokens ($ORIGIN
5310 and $PLATFORM) in RPATHs and similar strings (Ulrich Drepper).
5312 * rcmd can now handle netgroups (Dick Streefland).
5314 * A port to the ARM was contributed by Phil Blundell, Pat Beirne and Scott
5317 * Support for the IPv6 protocol has been added to the socket API, as per the
5318 latest draft standards.
5320 * Support for Linux 2.2 has been added.
5322 * Interface changes relative to the latest 2.0.x release:
5323 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
5324 addseverity NEW: Unix98
5325 alphasort64 NEW: LFS
5326 argp_err_exit_status NEW: argp, GNU ext
5327 argp_error NEW: argp, GNU ext
5328 argp_failure NEW: argp, GNU ext
5329 argp_help NEW: argp, GNU ext
5330 argp_parse NEW: argp, GNU ext
5331 argp_program_bug_address NEW: argp, GNU ext
5332 argp_program_version NEW: argp, GNU ext
5333 argp_program_version_hook NEW: argp, GNU ext
5334 argp_state_help NEW: argp, GNU ext
5335 argp_usage NEW: argp, GNU ext
5336 authdes_create NEW: Secure RPC
5337 authdes_getucred NEW: Secure RPC
5338 authdes_pk_create NEW: Secure RPC
5339 backtrace NEW: GNU ext.
5340 backtrace_symbols NEW: GNU ext.
5341 backtrace_symbols_fd NEW: GNU ext.
5343 cacosf NEW: ISO C 9x
5344 cacosh NEW: ISO C 9x
5345 cacoshf NEW: ISO C 9x
5346 cacoshl NEW: ISO C 9x
5347 cacosl NEW: ISO C 9x
5354 casinf NEW: ISO C 9x
5355 casinh NEW: ISO C 9x
5356 casinhf NEW: ISO C 9x
5357 casinhl NEW: ISO C 9x
5358 casinl NEW: ISO C 9x
5360 catanf NEW: ISO C 9x
5361 catanh NEW: ISO C 9x
5362 catanhf NEW: ISO C 9x
5363 catanhl NEW: ISO C 9x
5364 catanl NEW: ISO C 9x
5365 cbc_crypt NEW: Secure RPC
5369 ccoshf NEW: ISO C 9x
5370 ccoshl NEW: ISO C 9x
5376 cimagf NEW: ISO C 9x
5377 cimagl NEW: ISO C 9x
5378 clearerr_locked REMOVED
5379 clntunix_create NEW: sunrpc ext
5381 clog10 NEW: ISO C 9x
5382 clog10f NEW: ISO C 9x
5383 clog10l NEW: ISO C 9x
5393 cprojf NEW: ISO C 9x
5394 cprojl NEW: ISO C 9x
5396 crealf NEW: ISO C 9x
5397 creall NEW: ISO C 9x
5402 csinhf NEW: ISO C 9x
5403 csinhl NEW: ISO C 9x
5406 csqrtf NEW: ISO C 9x
5407 csqrtl NEW: ISO C 9x
5411 ctanhf NEW: ISO C 9x
5412 ctanhl NEW: ISO C 9x
5414 des_setparity NEW: Secure RPC
5415 ecb_crypt NEW: Secure RPC
5416 endutxent NEW: Unix98
5418 exp10f NEW: ISO C 9x
5419 exp10l NEW: ISO C 9x
5423 fattach NEW: STREAMS
5424 fdetach NEW: STREAMS
5428 feclearexcept NEW: ISO C 9x
5429 fegetenv NEW: ISO C 9x
5430 fegetexceptflag NEW: ISO C 9x
5431 fegetround NEW: ISO C 9x
5432 feholdexcept NEW: ISO C 9x
5434 feraiseexcept NEW: ISO C 9x
5435 ferror_locked REMOVED
5436 fesetenv NEW: ISO C 9x
5437 fesetexceptflag NEW: ISO C 9x
5438 fesetround NEW: ISO C 9x
5439 fetestexcept NEW: ISO C 9x
5440 feupdateenv NEW: ISO C 9x
5441 fflush_locked REMOVED
5445 fgets_unlocked NEW: GNU ext.
5446 fileno_locked REMOVED
5458 fputc_locked REMOVED
5459 fputs_unlocked NEW: GNU ext.
5460 fread_unlocked NEW: GNU ext.
5465 fstatvfs NEW: Unix98
5469 ftruncate64 NEW: LFS
5471 fwrite_unlocked NEW: GNU ext.
5472 gai_strerror NEW: IPv6
5476 getchar_locked REMOVED
5478 getdate_err NEW: Unix98
5479 getdate_r NEW: GNU ext.
5481 getnameinfo NEW: IPv6
5482 getnetname NEW: Secure RPC
5483 getpmsg NEW: STREAMS
5484 getpt NEW: Unix98 PTY
5485 getrlimit64 NEW: LFS
5486 getutxent NEW: Unix98
5487 getutxid NEW: Unix98
5488 getutxline NEW: Unix98
5489 glob64 NEW: GNU ext.
5490 globfree64 NEW: GNU ext.
5491 gnu_get_libc_release NEW: GNU ext.
5492 gnu_get_libc_version NEW: GNU ext.
5493 grantpt NEW: Unix98 PTY
5494 host2netname NEW: Secure RPC
5496 iconv_close NEW: iconv
5497 iconv_open NEW: iconv
5498 if_freenameindex NEW: IPv6
5499 if_indextoname NEW: IPv6
5500 if_nameindex NEW: IPv6
5501 if_nametoindex NEW: IPv6
5502 in6addr_any NEW: IPv6
5503 in6addr_loopback NEW: IPv6
5504 inet6_isipv4mapped NEW: IPv6
5505 isastream NEW: STREAMS
5506 iswblank NEW: GNU ext.
5507 key_decryptsession NEW: Secure RPC
5508 key_decryptsession_pk NEW: Secure RPC
5509 key_encryptsession NEW: Secure RPC
5510 key_encryptsession_pk NEW: Secure RPC
5511 key_gendes NEW: Secure RPC
5512 key_get_conv NEW: Secure RPC
5513 key_secretkey_is_set NEW: Secure RPC
5514 key_setnet NEW: Secure RPC
5515 key_setsecret NEW: Secure RPC
5516 llrint NEW: ISO C 9x
5517 llrintf NEW: ISO C 9x
5518 llrintl NEW: ISO C 9x
5519 llround NEW: ISO C 9x
5520 llroundf NEW: ISO C 9x
5521 llroundl NEW: ISO C 9x
5526 lrintf NEW: ISO C 9x
5527 lrintl NEW: ISO C 9x
5528 lround NEW: ISO C 9x
5529 lroundf NEW: ISO C 9x
5530 lroundl NEW: ISO C 9x
5532 makecontext NEW: Unix98
5533 mempcpy NEW: GNU ext.
5536 modify_ldt NEW: kernel
5540 nearbyint NEW: ISO C 9x
5541 nearbyintf NEW: ISO C 9x
5542 nearbyintl NEW: ISO C 9x
5543 netname2host NEW: Secure RPC
5544 netname2user NEW: Secure RPC
5545 nexttoward NEW: ISO C 9x
5546 nexttowardf NEW: ISO C 9x
5547 nexttowardl NEW: ISO C 9x
5551 passwd2des NEW: Secure RPC
5553 pow10f NEW: GNU ext.
5554 pow10l NEW: GNU ext.
5557 printf_size NEW: GNU ext.
5558 printf_size_info NEW: GNU ext.
5559 profil_counter REMOVED
5560 pthread_mutexattr_getkind_np REPLACED
5561 pthread_mutexattr_setkind_np REPLACED
5562 ptsname NEW: Unix98 PTY
5563 ptsname_r NEW: Unix98 PTY
5565 putchar_locked REMOVED
5566 putgrent NEW: GNU ext.
5568 putpmsg NEW: STREAMS
5569 pututxline NEW: Unix98
5573 readdir64_r NEW: LFS
5574 remquo NEW: ISO C 9x
5575 remquof NEW: ISO C 9x
5576 remquol NEW: ISO C 9x
5578 roundf NEW: ISO C 9x
5579 roundl NEW: ISO C 9x
5581 scalbln NEW: ISO C 9x
5582 scalblnf NEW: ISO C 9x
5583 scalblnl NEW: ISO C 9x
5585 sendfile NEW: kernel
5586 setcontext NEW: Unix98
5587 setrlimit64 NEW: LFS
5588 setutxent NEW: Unix98
5590 sigignore NEW: Unix98
5591 sigqueue NEW: POSIX.1b
5592 sigrelse NEW: Unix98
5593 sigset NEW: POSIX.1b
5594 sigtimedwait NEW: POSIX.1b
5595 sigwaitinfo NEW: POSIX.1b
5596 sincos NEW: GNU ext.
5597 sincosf NEW: GNU ext.
5598 sincosl NEW: GNU ext.
5602 strcasestr NEW: GNU ext.
5603 strtoimax NEW: ISO C 9x
5604 strtoumax NEW: ISO C 9x
5605 strverscmp NEW: GNU ext.
5606 svcauthdes_stats NEW: Secure RPC
5607 svcunix_create NEW: sunrpc etx
5608 svcunixfd_create NEW: sunrpc ext
5609 swapcontext NEW: Unix98
5610 tcgetsid NEW: Unix98 PTY
5611 tdestroy NEW: GNU ext.
5612 tgamma NEW: ISO C 9x
5613 tgammaf NEW: ISO C 9x
5614 tgammal NEW: ISO C 9x
5618 truncf NEW: ISO C 9x
5619 truncl NEW: ISO C 9x
5621 unlockpt NEW: Unix98 PTY
5622 updwtmpx NEW: Unix98
5623 user2netname NEW: Secure RPC
5624 utmpxname NEW: Unix98
5625 versionsort NEW: GNU ext.
5626 versionsort64 NEW: GNU ext.
5628 wcscasecmp NEW: GNU ext.
5629 wcsncasecmp NEW: GNU ext.
5630 wcsnlen NEW: GNU ext.
5631 wcstoimax NEW: ISO C 9x
5632 wcstoll NEW: ISO C 9x
5633 wcstoull NEW: ISO C 9x
5634 wcstoumax NEW: ISO C 9x
5636 wordexp NEW: POSIX.2
5637 wordfree NEW: POSIX.2
5638 write_profiling REMOVED
5639 xdecrypt NEW: Secure RPC
5640 xdr_authdes_cred NEW: Secure RPC
5641 xdr_authdes_verf NEW: Secure RPC
5642 xdr_cryptkeyarg NEW: Secure RPC
5643 xdr_cryptkeyarg2 NEW: Secure RPC
5644 xdr_cryptkeyres NEW: Secure RPC
5645 xdr_getcredres NEW: Secure RPC
5646 xdr_key_netstarg NEW: Secure RPC
5647 xdr_key_netstres NEW: Secure RPC
5648 xdr_keybuf NEW: Secure RPC
5649 xdr_keystatus NEW: Secure RPC
5650 xdr_netnamestr NEW: Secure RPC
5651 xdr_sizeof NEW: Secure RPC
5652 xdr_unixcred NEW: sunrpc ext
5653 xencrypt NEW: Secure RPC
5654 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
5665 * inet_ntoa is thread-safe
5667 * updwtmp is moved from libutil to libc
5669 * rewrite of cbrt function
5671 * update of timezone data
5685 * add atoll function
5687 * fix complex problems in Berkeley DB code
5689 * fix math functions
5693 * fixed lots of header problems (especially Linux/GNU specific)
5695 * dynamic loader preserves all registers
5697 * Roland McGrath provided support for handling of auxiliary objects in
5698 the ELF dynamic loader.
5700 * support for parallel builds is improved
5704 * GNU extensions are no longer declared by default. To enable them you
5705 must define the macro `_GNU_SOURCE' in your program or compile with
5708 * The library has changed from using GNU ld symbol aliases to using weak
5709 symbols where available. The ELF object file format supports weak
5710 symbols; GNU ld also supports weak symbols in the a.out format. (There
5711 is also now support for other GNU ld extensions in ELF. Use the
5712 `--with-elf' option to configure to indicate you have ELF, and
5713 `--with-gnu-ld' if using GNU ld.) This change resulted in the deletion
5714 of many files which contained only symbol aliases, reducing the size of
5715 the source and the compiled library; many other files were renamed to
5716 less cryptic names previously occupied by the symbol alias files.
5717 There is a new header file <elf.h> for programs which operate on
5718 files in the ELF format.
5720 * Converted to Autoconf version 2, so `configure' has more options.
5721 Run `configure --help' to see the details.
5723 * The library can now be configured to build profiling, highly-optimized
5724 (but undebuggable), and/or shared libraries (ELF with GNU ld only). The
5725 `--enable-profile', `--enable-omitfp', and `--enable-shared' options to
5726 `configure' enable building these extra libraries. The shared library is
5727 built by default when using both ELF and GNU ld. When shared libraries
5728 are enabled, the new library `-ldl' is available for arbitrary run-time
5729 loading of shared objects; its interface is defined in <dlfcn.h>. The
5730 new header file <link.h> gives access to the internals of the run-time
5731 dynamic linker, `ld.so'. The shell script `ldd' is similar to the
5732 application of same name on other systems and it provides information
5733 about dynamically linked binaries.
5735 * The C library now provides the run-time support code for profiling
5736 executables compiled with `-pg'. Programs can control the profiling code
5737 through the interface in <sys/gmon.h>. The `gmon.out' files written by
5738 the GNU C library can be read only by GNU `gprof' (from GNU binutils);
5739 the support for this file format was contributed by David Mosberger-Tang.
5741 * The math code has been replaced with a math library based on fdlibm from
5742 Sun, and modified by JT Conklin and Ulrich Drepper with i387 support, by
5743 Ian Taylor with `float' functions and by Ulrich Drepper with `long double'
5744 functions. The math functions now reside in a separate library, so
5745 programs using them will need to use `-lm' their linking commands.
5747 * John C. Bowman contributed optimized ix87 assembler inline functions.
5749 * Ulrich Drepper has contributed support for an `/etc/nsswitch.conf'
5750 mechanism similar to that found in Solaris 2. This is now used for the
5751 group, passwd, hosts, networks, services, protocols, rpc, ethers,
5752 shadow, netgroup, publickey, and alias databases. The `nsswitch.conf'
5753 file controls what services are used for each individual database. This
5754 works by loading shared libraries with names specified in `nsswitch.conf',
5755 so service modules can be changed or added at any time without even
5756 relinking any program. Currently there are the file, db, and NIS based
5757 NSS services available.
5759 * The new functions `strtoq' and `strtouq' parse integer values from
5760 strings, like `strtol' and `strtoul', but they return `long long int' and
5761 `unsigned long long int' values, respectively (64-bit quantities).
5763 * The new functions `strtof' and `strtold' parse floating-point values from
5764 strings, like `strtod', but they return `float' and `long double' values,
5765 respectively (on some machines `double' and `long double' are the same).
5767 * Ulrich Drepper has contributed new implementations of the floating-point
5768 printing and reading code used in the `printf' family of functions and
5769 `strtod', `strtof', and `strtold'. These new functions are perfectly
5770 accurate, and much faster than the old ones.
5772 * The implementation of the POSIX locale model was completely rewritten by
5773 Ulrich Drepper. This includes the new programs `localedef' and `locale'
5774 to compile the POSIX locale definition.
5776 * The former dummy implementations of the strcoll and strxfrm function are
5777 now replaced by fully functional code contributed by Ulrich Drepper. The
5778 collation information comes from the POSIX locale definitions.
5780 * The new header <langinfo.h> defines an interface for accessing
5781 various locale-dependent data (using the locale chosen with `setlocale').
5783 * Ulrich Drepper has contributed a new suite of functions for operation on
5784 wide-character and multibyte-character strings, in <wchar.h>;
5785 and classification and case conversion of wide characters, in <wctype.h>.
5786 These new functions are conforming to the ISO C, Amendement 1 specification.
5788 * There is now a second implementation of the standard I/O library available.
5789 It comes from GNU libg++ as was written by Per Bothner, heavily modified
5790 by Hongjiu Lu and made thread safe by Ulrich Drepper.
5792 * You can now use positional parameter specifications in format strings
5793 for the `printf' and `scanf' families of functions. For example,
5794 `printf ("Number %2$d, Mr %1$s\n", "Jones", 6);'' prints
5795 ``Number 6, Mr Jones''. This is mainly useful when providing different
5796 format strings for different languages, whose grammars may dictate
5797 different orderings of the values being printed. To support this
5798 feature, the interface for `register_printf_handler' has changed; see
5799 the header file <printf.h> for details.
5801 * The `printf' and `scanf' families of functions now understand a new
5802 formatting flag for numeric conversions: the ' flag (e.g. %'d or %'f) says
5803 to group numbers as indicated by the locale; for `scanf' and friends, this
5804 says to accept as valid only a number with all the proper grouping
5805 separators in the right places. In the default "C" locale, numbers are
5806 not grouped; but locales for specific countries will define the usual
5807 conventions (i.e. separate thousands with `,' in the US locale).
5809 * The pgrp functions have been regularized, slightly incompatibly but much
5810 less confusingly. The core functions are now `getpgid' and `setpgid',
5811 which take arguments for the PID to operate on; the POSIX.1 `getpgrp' (no
5812 argument) and BSD `setpgrp' (identical to `setpgid') functions are
5813 provided for compatibility. There is no longer an incompatible `getpgrp'
5814 with an argument declared under _BSD_SOURCE; no BSD code uses it.
5816 * The new header file <fts.h> and suite of functions simplify programs that
5817 operate on directory trees. This code comes from 4.4 BSD.
5819 * The resolver code has been updated from the BIND 4.9.5-P1 release.
5820 Parts of the code were heavily modified by Ulrich Drepper to fit in the
5821 NSS scheme used in glibc.
5823 * There is a new malloc debugging hook `__memalign_hook'.
5825 * There are new typedefs `ushort' for `unsigned short int' and `uint' for
5826 `unsigned int' in <sys/types.h>. These are for compatibility only and
5827 their use is discouraged.
5829 * The `-lmcheck' library to enable standard malloc debugging hooks is now
5830 done differently, so that it works even without GNU ld.
5832 * New function `euidaccess' checks allowed access to a file like `access',
5833 but using the effective IDs instead of the real IDs.
5835 * The time zone data files have been updated for the latest and greatest
5836 local time conventions of the countries of the world.
5838 * The new function `dirfd' extracts the file descriptor used by a DIR stream;
5841 * The new functions `ecvt', `fcvt', and `gcvt' provide an obsolete interface
5842 for formatting floating-point numbers. They are provided only for
5843 compatibility; new programs should use `sprintf' instead. There are
5844 also equivalent function for the `long double' floating-point type and
5845 all functions also exist in a reentrant form.
5847 * The new auxiliary library `-lutil' from 4.4 BSD contains various
5848 functions for maintaining the login-record files (primarily of use to
5849 system programs such as `login'), and convenient functions for
5850 allocating and initializing a pseudo-terminal (pty) device.
5852 * Ulrich Drepper has contributed new support for System V style
5853 shared memory and IPC on systems that support it.
5855 * Ulrich Drepper has contributed several miscellaneous new functions found
5856 in System V: The `hsearch' family of functions provide an effective
5857 implementation of hash tables; `a64l' and `l64a' provide a very simple
5858 binary to ASCII mapping; `drand48' and friends provide a 48-bit random
5861 * Ulrich Drepper has contributed new reentrant counterparts for the
5862 `random' and `hsearch' families of functions; `random_r', `hsearch_r', etc.
5864 * Ulrich Drepper has contributed new, highly-optimized versions of several
5865 string functions for the i486/Pentium family of processors.
5867 * Ulrich Drepper has updated the Linux-specific code, based largely
5868 on work done in Hongjiu Lu's version of GNU libc for Linux.
5869 The GNU library now supports Linux versions 2.0.10 and later,
5870 using the ELF object file format (i[3456]86-*-linux).
5872 * Andreas Schwab has ported the C library to Linux/m68k (m68k-*-linux).
5874 * David Mosberger-Tang and Richard Henderson have ported the C library
5875 to Linux/Alpha (alpha-*-linux). Richard Henderson contributed the
5876 dynamic linking support for ELF/Alpha.
5878 * Richard Henderson contributed several Alpha optimized assembler function
5879 for arithmetic and string handling.
5881 * Ulrich Drepper has contributed a new set of message catalog functions to
5882 support multiple languages using the <libintl.h> interface, for use with
5883 his new package GNU gettext. Translation volunteers have contributed
5884 catalogs of the library's messages in Spanish, German, and Korean.
5886 * For compatibility with XPG4, Ulrich Drepper has contributed the `gencat'
5887 program and the `catgets' function for reading the catalog files it
5888 creates. (The <libintl.h> interface is preferred; we include the
5889 <nl_types.h> interface using `catgets' only for source compatibility with
5890 programs already written to use it.)
5892 * New header file <values.h> gives SVID-compatible names for <limits.h>
5895 * Various new macros, declarations, and small header files for compatibility
5898 * New function `group_member' is a convenient way to check if a process has
5899 a given effective group ID.
5901 * When using GCC 2.7 and later, the socket functions are now declared in a
5902 special way so that passing an argument of type `struct sockaddr_in *',
5903 `struct sockaddr_ns *', or `struct sockaddr_un *' instead of the generic
5904 `struct sockaddr *' type, does not generate a type-clash warning.
5906 * New function `error' declared in header file <error.h> is a convenient
5907 function for printing error messages and optionally exiting; this is the
5908 canonical function used in GNU programs. The new functions `err', `warn',
5909 and friends in header file <err.h> are the canonical 4.4 BSD interface for
5910 doing the same thing.
5912 * The <glob.h> interface has several new flags from 4.4 BSD that extend the
5913 POSIX.2 `glob' function to do ~ and {...} expansion.
5915 * New function `unsetenv' complements `setenv' for compatibility with 4.4 BSD.
5916 `clearenv' which is used in POSIX.9 is also available.
5918 * New function `getsid' returns session ID number on systems that support it.
5920 * We have incorporated the 4.4 BSD `db' library (version 1.85). New header
5921 files <db.h> and <mpool.h> provide a rich set of functions for several
5922 types of simple databases stored in memory and in files, and <ndbm.h> is
5923 an old `ndbm'-compatible interface using the `db' functions. Link with
5924 `-ldb' to get these functions.
5926 * New macro `strdupa' copies a string like `strdup', but uses local stack
5927 space from `alloca' instead of dynamic heap space from `malloc'.
5929 * New function `strnlen' is like `strlen' but searches only a given maximum
5930 number of characters for the null terminator. `stpncpy', `strndup' and
5931 `strndupa' are similar variants for the `stpcpy', `strdup' and `strdupa'
5934 * New function `statfs' in header <sys/statfs.h>.
5936 * The new <argz.h> and <envz.h> interfaces contributed by Miles Bader
5937 provide convenient functions for operating on blocks of null-terminated
5940 * A new suite of functions in <utmp.h> handle all the details of reading
5941 and writing the utmp file.
5943 * An implementation of the NIS/YP(tm) based NSS service was contributed by
5946 * Paul Eggert and Ulrich Drepper modified the `strftime' function to be
5947 completely POSIX compliant and also implemented the extended functionality
5948 to handle alternate digit representation and alternate era date formats.
5950 * Ulrich Drepper provided an implementation of the `strptime' function
5951 defined in XPG4.2 which transforms a string into a `struct tm' value.
5953 * Paul Eggert provided the tzselect shell script as part of the timezone
5954 code. The shell script makes it easy to select the correct timezone
5957 * The implementation of the malloc family of functions is completely replaced
5958 by a new implementation by Doug Lea with many improvements by Wolfram Gloger.
5959 The implementation uses the mmap function (if available) and it is
5960 optimized for the use in multi threaded programs.
5962 * Ulrich Drepper contributed a MD5 "encryption" for the crypt family of
5963 functions. This new functionality is usable by specifying a special
5964 salt string and it is compatible with implementation on *BSD systems.
5966 * Lots of functions from the XPG4.2 standard were added by Ulrich Drepper:
5967 `getsubopt' to handle second level command line options, `bsd_signal'
5968 to access BSD style `signal' functionality, the obsolete `regexp' style
5971 * the `lchown' function is available on system which support this
5974 * The implementation of the shadow password handling function was contributed
5977 * David Mosberger-Tang changed the SunRPC implementation to be 64bit safe.
5979 * POSIX.1g support was added. The <sys/select.h> header is available,
5980 `isfdtype' and `pselect' are implemented. Craig Metz contributed an
5981 implementation of `getaddrinfo'.
5985 * For cross-compilation you should now set `BUILD_CC' instead of `HOST_CC'.
5987 * New header file <fstab.h> and new functions `getfsspec', `getfsent' and
5988 friends, for parsing /etc/fstab. This code comes from 4.4 BSD.
5990 * The new function `daemon' from 4.4 BSD is useful for server programs that
5991 want to put themselves in the background.
5993 * Joel Sherrill has contributed support for several standalone boards that
5994 run without an operating system.
5996 * `printf', `scanf' and friends now accept a `q' type modifier for long
5997 long int as well as `ll'. Formats using these might be `%qu' or `%lld'.
5999 * All of the code taken from BSD (notably most of the math and networking
6000 routines) has been updated from the BSD 4.4-Lite release.
6002 * The resolver code has been updated from the BIND-4.9.3-BETA9 release.
6004 * The new functions `getdomainname' and `setdomainname' fetch or change the
6005 YP/NIS domain name. These are system calls which exist on systems which
6008 * The time zone data files have been updated for the latest international
6011 * The SunRPC programs `portmap' and `rpcinfo' are now installed in
6012 $(sbindir) (usually /usr/local/sbin) instead of $(bindir).
6016 * The C library now includes support for Sun RPC, from Sun's free
6017 RPCSRC-4.0 distribution. The `portmap', `rpcinfo', and `rpcgen' programs
6018 are included. (There is still no support for YP.)
6020 * Tom Quinn has contributed a port of the C library to SGI machines running
6021 Irix 4 (mips-sgi-irix4).
6023 * The new `lockf' function is a simplified interface to the locking
6024 facilities of `fcntl', included for compatibility.
6026 * New time functions `timegm', `timelocal', and `dysize' for compatibility.
6028 * New header file <sys/timeb.h> and new function `ftime' for compatibility.
6030 * New header files <poll.h> and <sys/poll.h> and new function `poll' for
6033 * The error message printed by `assert' for a failed assertion now includes
6034 the name of the program (if using GNU ld) and the name of the calling
6035 function (with versions of GCC that support this).
6037 * The `psignal' function is now declared in <signal.h>, not <stdio.h>.
6039 * The library now includes the <sys/mman.h> header file and memory
6040 management functions `mmap', `munmap', `mprotect', `msync', and
6041 `madvise', on systems that support those facilities.
6043 * The interface for `mcheck' has changed slightly: the function called to
6044 abort the program when an allocation inconsistency is detected now takes
6045 an argument that indicates the type of failure. The new function
6046 `mprobe' lets you request a consistency check for a particular block at
6047 any time (checks are normally done only when you call `free' or `realloc'
6050 * It is now possible to easily cross-compile the C library, building on one
6051 system a library to run on another machine and/or operating system. All
6052 you need to do is set the variable `HOST_CC' in `configparms' to the
6053 native compiler for programs to run on the machine you are building on (a
6054 few generator programs are used on Unix systems); set `CC' to the
6057 * The new function `fexecve' (only implemented on the GNU system) executes
6058 a program file given a file descriptor already open on the file.
6062 * Brendan Kehoe has contributed most of a port to the DEC Alpha
6063 running OSF/1 (alpha-dec-osf1). He says it is 75% complete.
6065 * You can set the variable `libprefix' in `configparms' to specify a prefix
6066 to be prepended to installed library files; this makes it easy to install
6067 the GNU C library to be linked as `-lgnuc' or whatever.
6069 * The new `stpncpy' is a cross between `stpcpy' and `strncpy': It
6070 copies a limited number of characters from a string, and returns the
6071 address of the last character written.
6073 * You no longer need to check for whether the installed `stddef.h' is
6074 compatible with the GNU C library. configure now checks for you.
6076 * You can now define a per-stream `fileno' function to convert the
6077 stream's cookie into an integral file descriptor.
6079 * ``malloc (0)'' no longer returns a null pointer. Instead, it
6080 allocates zero bytes of storage, and returns a unique pointer which
6081 you can pass to `realloc' or `free'. The behavior is undefined if
6082 you dereference this pointer.
6084 * The C library now runs on Sony NEWS m68k machines running either
6085 NewsOS 3 or NewsOS 4.
6087 * The new `syscall' function is a system-dependent primitive function
6088 for invoking system calls. It has the canonical behavior on Unix
6089 systems, including unreliable return values for some calls (such as
6090 `pipe', `fork' and `getppid').
6092 * The error code `EWOULDBLOCK' is now obsolete; it is always defined
6093 to `EAGAIN', which is the preferred name. On systems whose kernels
6094 use two distinct codes, the C library now translates EWOULDBLOCK to
6095 EAGAIN in every system call function.
6099 * The GNU C Library Reference Manual is now distributed with the library.
6100 `make dvi' will produce a DVI file of the printed manual.
6101 `make info' will produce Info files that you can read on line using C-h i
6102 in Emacs or the `info' program.
6103 Please send comments on the manual to bug-glibc-manual@gnu.org.
6105 * The library now supports SVR4 on i386s (i386-unknown-sysv4).
6107 * Brendan Kehoe has contributed a port to Sun SPARCs running Solaris 2.
6109 * Jason Merrill has contributed a port to the Sequent Symmetry running
6110 Dynix version 3 (i386-sequent-dynix).
6112 * The library has been ported to i386s running SCO 3.2.4 (also known as SCO
6113 ODT 2.0; i386-unknown-sco3.2.4) or SCO 3.2 (i386-unknown-sco3.2).
6115 * New function `memory_warnings' lets you arrange to get warnings when
6116 malloc is running out of memory to allocate, like Emacs gives you.
6118 * The C library now contains the relocating allocator used in Emacs 19 for
6119 its editing buffers. This allocator (ralloc) minimizes allocation
6120 overhead and fragmentation by moving allocated regions around whenever it
6121 needs to. You always refer to a ralloc'd region with a "handle" (a
6122 pointer to a pointer--an object of type `void **').
6124 * There is a new `printf' format: `%m' gives you the string corresponding
6125 to the error code in `errno'.
6127 * In `scanf' formats, you can now use `%as' or `%a[' to do the normal `%s'
6128 or `%[' conversion, but instead of filling in a fixed-sized buffer you
6129 pass, the `a' modifier says to fill in a `char **' you pass with a
6132 * The `fnmatch' function supports the new flag bits `FNM_LEADING_DIR' and
6133 `FNM_CASEFOLD'. `FNM_LEADING_DIR' lets a pattern like `foo*' match a
6134 name like `foo/bar'. `FNM_CASEFOLD' says to ignore case in matching.
6136 * `mkstemp' is a traditional Unix function to atomically create and open a
6137 uniquely-named temporary file.
6141 * The standard location for the file that says what the local timezone is
6142 has changed again. It is now `/usr/local/etc/localtime' (or more
6143 precisely, `${prefix}/etc/localtime') rather than `/etc/localtime'.
6145 * The distribution no longer contains any files with names longer than 14
6148 * `struct ttyent' has two new flag bits: TTY_TRUSTED and TTY_CONSOLE.
6149 These are set by the new `trusted' and `console' keywords in `/etc/ttys'.
6151 * New functions `ttyslot' and `syslog' from 4.4 BSD.
6155 * The configuration process has changed quite a bit. The `configure'
6156 script is now used just like the configuration scripts for other GNU
6157 packages. The `sysdeps' directory hierarchy is much rearranged.
6158 The file `INSTALL' explains the new scheme in detail.
6160 * The header files no longer need to be processed into ANSI C and
6161 traditional C versions. There is just one set of files to install, and
6162 it will work with ANSI or old C compilers (including `gcc -traditional').
6164 * Brendan Kehoe and Ian Lance Taylor have ported the library to the
6165 MIPS DECStation running Ultrix 4.
6167 * The Sun 4 startup code (crt0) can now properly load SunOS 4 shared libraries.
6168 Tom Quinn contributed the initial code. The GNU C library can NOT yet be
6169 made itself into a shared library.
6171 * Yet further improved support for the i386, running 4.3 BSD-like systems
6172 (such as Mach 3 with the Unix single-server), or System V.
6174 * New function `strncasecmp' to do case-insensitive string comparison
6175 with limited length.
6177 * New function `strsep' is a reentrant alternative to `strtok'.
6179 * New functions `scandir' and `alphasort' for searching directories.
6181 * New function `setenv' is a better interface to `putenv'.
6183 * Ian Lance Taylor has contributed an implementation of the SVID `ftw'
6184 function for traversing a directory tree.
6186 * The GNU obstack package is now also part of the C library.
6187 The new function `open_obstack_stream' creates a stdio stream that
6188 writes onto an obstack; `obstack_printf' and `obstack_vprintf' do
6189 formatted output directly to an obstack.
6191 * Miscellaneous new functions: reboot, nice, sigaltstack (4.4 BSD only),
6192 cfmakeraw, getusershell, getpass, swab, getttyent, seteuid, setegid.
6194 * `FNM_FILE_NAME' is another name for `FNM_PATHNAME', used with `fnmatch'.
6196 * The new functions `strfry' and `memfrob' do mysterious and wonderful
6197 things to your strings.
6199 * There are some new test programs: test-fseek, testmb, and testrand.
6201 * Some work has been done to begin porting the library to 4.4 BSD and Linux.
6202 These ports are not finished, but are a good starting place for really
6203 supporting those systems.
6205 * `/etc/localtime' is now the standard location for the file that says what
6206 the local timezone is, rather than `/usr/local/lib/zoneinfo/localtime'.
6207 This follows the general principle that `/etc' is the place for all local
6208 configuration files.
6210 * The C library header files now use `extern "C"' when used by the C++
6211 compiler, so the C library should now work with C++ code.
6213 * The header file <bstring.h> is gone. <string.h> now declares bcopy,
6214 bcmp, bzero, and ffs. (Update: nowadays these functions are declared
6217 * Mike Haertel (of GNU e?grep and malloc fame) has written a new sorting
6218 function which uses the `merge sort' algorithm, and is said to be
6219 significantly faster than the old GNU `qsort' function. Merge sort is
6220 now the standard `qsort' function. The new algorithm can require a lot
6221 of temporary storage; so, the old sorting function is called when the
6222 required storage is not available.
6224 * The C library now includes Michael Glad's Ultra Fast Crypt, which
6225 provides the Unix `crypt' function, plus some other entry points.
6227 * The code and header files taken from 4.4 BSD have been updated with the
6228 latest files released from Berkeley.
6230 ----------------------------------------------------------------------
6233 Permission is granted to anyone to make or distribute verbatim copies
6234 of this document as received, in any medium, provided that the
6235 copyright notice and this permission notice are preserved,
6236 thus giving the recipient permission to redistribute in turn.
6238 Permission is granted to distribute modified versions
6239 of this document, or of portions of it,
6240 under the above conditions, provided also that they
6241 carry prominent notices stating who last changed them.
6244 version-control: never