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d66e34cd | 1 | /* Run time dynamic linker. |
b168057a | 2 | Copyright (C) 1995-2015 Free Software Foundation, Inc. |
afd4eb37 | 3 | This file is part of the GNU C Library. |
d66e34cd | 4 | |
afd4eb37 | 5 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
d66e34cd | 9 | |
afd4eb37 UD |
10 | The GNU C Library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
d66e34cd | 14 | |
41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
d66e34cd | 18 | |
7d0b1164 | 19 | #include <errno.h> |
154d10bd | 20 | #include <dlfcn.h> |
7dea968e | 21 | #include <fcntl.h> |
164a7164 | 22 | #include <stdbool.h> |
d66e34cd | 23 | #include <stdlib.h> |
f51d1dfd | 24 | #include <string.h> |
d66e34cd | 25 | #include <unistd.h> |
20739e54 | 26 | #include <sys/mman.h> |
af8bf6bd | 27 | #include <sys/param.h> |
ba9fcb3f | 28 | #include <sys/stat.h> |
a42195db | 29 | #include <ldsodefs.h> |
eb96ffb0 | 30 | #include <_itoa.h> |
f21acc89 | 31 | #include <entry.h> |
c94a8080 | 32 | #include <fpu_control.h> |
db276fa1 | 33 | #include <hp-timing.h> |
ec999b8e | 34 | #include <libc-lock.h> |
f5348425 | 35 | #include "dynamic-link.h" |
8f480b4b | 36 | #include <dl-librecon.h> |
74955460 | 37 | #include <unsecvars.h> |
5688da55 | 38 | #include <dl-cache.h> |
2f4db0df | 39 | #include <dl-osinfo.h> |
5688da55 | 40 | #include <dl-procinfo.h> |
5f5843e3 | 41 | #include <tls.h> |
815e6fa3 | 42 | #include <stap-probe.h> |
30950a5f | 43 | #include <stackinfo.h> |
f5348425 | 44 | |
a853022c | 45 | #include <assert.h> |
f5348425 | 46 | |
6ce3881d RM |
47 | /* Avoid PLT use for our local calls at startup. */ |
48 | extern __typeof (__mempcpy) __mempcpy attribute_hidden; | |
49 | ||
50 | /* GCC has mental blocks about _exit. */ | |
51 | extern __typeof (_exit) exit_internal asm ("_exit") attribute_hidden; | |
52 | #define _exit exit_internal | |
53 | ||
fd26970f | 54 | /* Helper function to handle errors while resolving symbols. */ |
c84142e8 UD |
55 | static void print_unresolved (int errcode, const char *objname, |
56 | const char *errsting); | |
57 | ||
58 | /* Helper function to handle errors when a version is missing. */ | |
59 | static void print_missing_version (int errcode, const char *objname, | |
60 | const char *errsting); | |
fd26970f | 61 | |
db276fa1 | 62 | /* Print the various times we collected. */ |
392a6b52 | 63 | static void print_statistics (hp_timing_t *total_timep); |
ea278354 | 64 | |
74780cf6 UD |
65 | /* Add audit objects. */ |
66 | static void process_dl_audit (char *str); | |
67 | ||
ea278354 UD |
68 | /* This is a list of all the modes the dynamic loader can be in. */ |
69 | enum mode { normal, list, verify, trace }; | |
70 | ||
71 | /* Process all environments variables the dynamic linker must recognize. | |
72 | Since all of them start with `LD_' we are a bit smarter while finding | |
73 | all the entries. */ | |
ba9fcb3f | 74 | static void process_envvars (enum mode *modep); |
ea278354 | 75 | |
11986c68 | 76 | #ifdef DL_ARGV_NOT_RELRO |
22aa06a5 | 77 | int _dl_argc attribute_hidden; |
11986c68 | 78 | char **_dl_argv = NULL; |
22aa06a5 RM |
79 | /* Nonzero if we were run directly. */ |
80 | unsigned int _dl_skip_args attribute_hidden; | |
11986c68 | 81 | #else |
22aa06a5 | 82 | int _dl_argc attribute_relro attribute_hidden; |
697afbe1 | 83 | char **_dl_argv attribute_relro = NULL; |
22aa06a5 | 84 | unsigned int _dl_skip_args attribute_relro attribute_hidden; |
11986c68 | 85 | #endif |
4243cbea | 86 | rtld_hidden_data_def (_dl_argv) |
5c82e15e | 87 | |
35f1e827 UD |
88 | #ifndef THREAD_SET_STACK_GUARD |
89 | /* Only exported for architectures that don't store the stack guard canary | |
90 | in thread local area. */ | |
91 | uintptr_t __stack_chk_guard attribute_relro; | |
92 | #endif | |
93 | ||
827b7087 UD |
94 | /* Only exported for architectures that don't store the pointer guard |
95 | value in thread local area. */ | |
96 | uintptr_t __pointer_chk_guard_local | |
97 | attribute_relro attribute_hidden __attribute__ ((nocommon)); | |
98 | #ifndef THREAD_SET_POINTER_GUARD | |
99 | strong_alias (__pointer_chk_guard_local, __pointer_chk_guard) | |
100 | #endif | |
101 | ||
102 | ||
9dcafc55 UD |
103 | /* List of auditing DSOs. */ |
104 | static struct audit_list | |
105 | { | |
106 | const char *name; | |
107 | struct audit_list *next; | |
108 | } *audit_list; | |
109 | ||
ce6e047f | 110 | #ifndef HAVE_INLINED_SYSCALLS |
39778c6c UD |
111 | /* Set nonzero during loading and initialization of executable and |
112 | libraries, cleared before the executable's entry point runs. This | |
113 | must not be initialized to nonzero, because the unused dynamic | |
114 | linker loaded in for libc.so's "ld.so.1" dep will provide the | |
115 | definition seen by libc.so's initializer; that value must be zero, | |
116 | and will be since that dynamic linker's _dl_start and dl_main will | |
117 | never be called. */ | |
e6caf4e1 | 118 | int _dl_starting_up = 0; |
9cf27b8d | 119 | rtld_hidden_def (_dl_starting_up) |
ce6e047f | 120 | #endif |
39778c6c | 121 | |
d6b5d570 UD |
122 | /* This is the structure which defines all variables global to ld.so |
123 | (except those which cannot be added for some reason). */ | |
5688da55 UD |
124 | struct rtld_global _rtld_global = |
125 | { | |
30950a5f RA |
126 | /* Generally the default presumption without further information is an |
127 | * executable stack but this is not true for all platforms. */ | |
128 | ._dl_stack_flags = DEFAULT_STACK_PERMS, | |
ffa8d2a0 | 129 | #ifdef _LIBC_REENTRANT |
22c83193 | 130 | ._dl_load_lock = _RTLD_LOCK_RECURSIVE_INITIALIZER, |
5a2a1d75 | 131 | ._dl_load_write_lock = _RTLD_LOCK_RECURSIVE_INITIALIZER, |
ffa8d2a0 | 132 | #endif |
415ac3df UD |
133 | ._dl_nns = 1, |
134 | ._dl_ns = | |
135 | { | |
bea9b193 | 136 | #ifdef _LIBC_REENTRANT |
415ac3df UD |
137 | [LM_ID_BASE] = { ._ns_unique_sym_table |
138 | = { .lock = _RTLD_LOCK_RECURSIVE_INITIALIZER } } | |
bea9b193 | 139 | #endif |
415ac3df | 140 | } |
5688da55 | 141 | }; |
27a754a9 UD |
142 | /* If we would use strong_alias here the compiler would see a |
143 | non-hidden definition. This would undo the effect of the previous | |
144 | declaration. So spell out was strong_alias does plus add the | |
145 | visibility attribute. */ | |
146 | extern struct rtld_global _rtld_local | |
147 | __attribute__ ((alias ("_rtld_global"), visibility ("hidden"))); | |
c0fb8a56 | 148 | |
afdca0f2 UD |
149 | |
150 | /* This variable is similar to _rtld_local, but all values are | |
151 | read-only after relocation. */ | |
152 | struct rtld_global_ro _rtld_global_ro attribute_relro = | |
153 | { | |
c31e278f UD |
154 | /* Get architecture specific initializer. */ |
155 | #include <dl-procinfo.c> | |
afdca0f2 UD |
156 | #ifdef NEED_DL_SYSINFO |
157 | ._dl_sysinfo = DL_SYSINFO_DEFAULT, | |
158 | #endif | |
dd70526e | 159 | ._dl_debug_fd = STDERR_FILENO, |
afdca0f2 UD |
160 | ._dl_use_load_bias = -2, |
161 | ._dl_correct_cache_id = _DL_CACHE_DEFAULT_ID, | |
162 | ._dl_hwcap_mask = HWCAP_IMPORTANT, | |
163 | ._dl_lazy = 1, | |
164 | ._dl_fpu_control = _FPU_DEFAULT, | |
827b7087 | 165 | ._dl_pointer_guard = 1, |
02d46fc4 | 166 | ._dl_pagesize = EXEC_PAGESIZE, |
73d65cc3 | 167 | ._dl_inhibit_cache = 0, |
154d10bd UD |
168 | |
169 | /* Function pointers. */ | |
154d10bd UD |
170 | ._dl_debug_printf = _dl_debug_printf, |
171 | ._dl_catch_error = _dl_catch_error, | |
172 | ._dl_signal_error = _dl_signal_error, | |
ab97ee8f | 173 | ._dl_mcount = _dl_mcount, |
021723ab | 174 | ._dl_lookup_symbol_x = _dl_lookup_symbol_x, |
9dcafc55 UD |
175 | ._dl_check_caller = _dl_check_caller, |
176 | ._dl_open = _dl_open, | |
93025f93 | 177 | ._dl_close = _dl_close, |
7c22c7ec UD |
178 | ._dl_tls_get_addr_soft = _dl_tls_get_addr_soft, |
179 | #ifdef HAVE_DL_DISCOVER_OSVERSION | |
180 | ._dl_discover_osversion = _dl_discover_osversion | |
181 | #endif | |
afdca0f2 UD |
182 | }; |
183 | /* If we would use strong_alias here the compiler would see a | |
184 | non-hidden definition. This would undo the effect of the previous | |
185 | declaration. So spell out was strong_alias does plus add the | |
186 | visibility attribute. */ | |
187 | extern struct rtld_global_ro _rtld_local_ro | |
188 | __attribute__ ((alias ("_rtld_global_ro"), visibility ("hidden"))); | |
189 | ||
190 | ||
67ddea92 | 191 | static void dl_main (const ElfW(Phdr) *phdr, ElfW(Word) phnum, |
3a56ea26 | 192 | ElfW(Addr) *user_entry, ElfW(auxv_t) *auxv); |
d66e34cd | 193 | |
392a6b52 | 194 | /* These two variables cannot be moved into .data.rel.ro. */ |
d6b5d570 UD |
195 | static struct libname_list _dl_rtld_libname; |
196 | static struct libname_list _dl_rtld_libname2; | |
86d2c878 | 197 | |
db276fa1 | 198 | /* Variable for statistics. */ |
5732c4df | 199 | #ifndef HP_TIMING_NONAVAIL |
db276fa1 | 200 | static hp_timing_t relocate_time; |
392a6b52 UD |
201 | static hp_timing_t load_time attribute_relro; |
202 | static hp_timing_t start_time attribute_relro; | |
5732c4df | 203 | #endif |
db276fa1 | 204 | |
2a76f7ef UD |
205 | /* Additional definitions needed by TLS initialization. */ |
206 | #ifdef TLS_INIT_HELPER | |
207 | TLS_INIT_HELPER | |
5e289179 UD |
208 | #endif |
209 | ||
210 | /* Helper function for syscall implementation. */ | |
211 | #ifdef DL_SYSINFO_IMPLEMENTATION | |
212 | DL_SYSINFO_IMPLEMENTATION | |
2a76f7ef UD |
213 | #endif |
214 | ||
01d8e36d UD |
215 | /* Before ld.so is relocated we must not access variables which need |
216 | relocations. This means variables which are exported. Variables | |
217 | declared as static are fine. If we can mark a variable hidden this | |
27a754a9 | 218 | is fine, too. The latter is important here. We can avoid setting |
01d8e36d UD |
219 | up a temporary link map for ld.so if we can mark _rtld_global as |
220 | hidden. */ | |
11bf311e | 221 | #ifdef PI_STATIC_AND_HIDDEN |
01d8e36d UD |
222 | # define DONT_USE_BOOTSTRAP_MAP 1 |
223 | #endif | |
224 | ||
225 | #ifdef DONT_USE_BOOTSTRAP_MAP | |
226 | static ElfW(Addr) _dl_start_final (void *arg); | |
227 | #else | |
4874b009 RM |
228 | struct dl_start_final_info |
229 | { | |
230 | struct link_map l; | |
231 | #if !defined HP_TIMING_NONAVAIL && HP_TIMING_INLINE | |
232 | hp_timing_t start_time; | |
233 | #endif | |
234 | }; | |
01d8e36d | 235 | static ElfW(Addr) _dl_start_final (void *arg, |
4874b009 | 236 | struct dl_start_final_info *info); |
01d8e36d | 237 | #endif |
6a1db4ff | 238 | |
65da9563 RM |
239 | /* These defined magically in the linker script. */ |
240 | extern char _begin[] attribute_hidden; | |
eec8b6ca | 241 | extern char _etext[] attribute_hidden; |
65da9563 RM |
242 | extern char _end[] attribute_hidden; |
243 | ||
244 | ||
b1dbbaa4 RM |
245 | #ifdef RTLD_START |
246 | RTLD_START | |
247 | #else | |
eaad82e0 | 248 | # error "sysdeps/MACHINE/dl-machine.h fails to define RTLD_START" |
b1dbbaa4 RM |
249 | #endif |
250 | ||
c2248c44 RM |
251 | /* This is the second half of _dl_start (below). It can be inlined safely |
252 | under DONT_USE_BOOTSTRAP_MAP, where it is careful not to make any GOT | |
253 | references. When the tools don't permit us to avoid using a GOT entry | |
254 | for _dl_rtld_global (no attribute_hidden support), we must make sure | |
255 | this function is not inlined (see below). */ | |
256 | ||
257 | #ifdef DONT_USE_BOOTSTRAP_MAP | |
258 | static inline ElfW(Addr) __attribute__ ((always_inline)) | |
259 | _dl_start_final (void *arg) | |
260 | #else | |
261 | static ElfW(Addr) __attribute__ ((noinline)) | |
4874b009 | 262 | _dl_start_final (void *arg, struct dl_start_final_info *info) |
c2248c44 RM |
263 | #endif |
264 | { | |
265 | ElfW(Addr) start_addr; | |
c2248c44 | 266 | |
8c682bb2 | 267 | if (HP_SMALL_TIMING_AVAIL) |
c2248c44 RM |
268 | { |
269 | /* If it hasn't happen yet record the startup time. */ | |
270 | if (! HP_TIMING_INLINE) | |
271 | HP_TIMING_NOW (start_time); | |
735d67f2 | 272 | #if !defined DONT_USE_BOOTSTRAP_MAP && !defined HP_TIMING_NONAVAIL |
4874b009 RM |
273 | else |
274 | start_time = info->start_time; | |
275 | #endif | |
c2248c44 RM |
276 | } |
277 | ||
278 | /* Transfer data about ourselves to the permanent link_map structure. */ | |
279 | #ifndef DONT_USE_BOOTSTRAP_MAP | |
4874b009 RM |
280 | GL(dl_rtld_map).l_addr = info->l.l_addr; |
281 | GL(dl_rtld_map).l_ld = info->l.l_ld; | |
282 | memcpy (GL(dl_rtld_map).l_info, info->l.l_info, | |
c2248c44 | 283 | sizeof GL(dl_rtld_map).l_info); |
4874b009 | 284 | GL(dl_rtld_map).l_mach = info->l.l_mach; |
82221992 | 285 | GL(dl_rtld_map).l_relocated = 1; |
c2248c44 RM |
286 | #endif |
287 | _dl_setup_hash (&GL(dl_rtld_map)); | |
c0f62c56 | 288 | GL(dl_rtld_map).l_real = &GL(dl_rtld_map); |
c2248c44 RM |
289 | GL(dl_rtld_map).l_map_start = (ElfW(Addr)) _begin; |
290 | GL(dl_rtld_map).l_map_end = (ElfW(Addr)) _end; | |
eec8b6ca | 291 | GL(dl_rtld_map).l_text_end = (ElfW(Addr)) _etext; |
c2248c44 | 292 | /* Copy the TLS related data if necessary. */ |
11bf311e | 293 | #ifndef DONT_USE_BOOTSTRAP_MAP |
3d8c8bff | 294 | # if NO_TLS_OFFSET != 0 |
299601a1 | 295 | GL(dl_rtld_map).l_tls_offset = NO_TLS_OFFSET; |
c2248c44 | 296 | # endif |
c2248c44 RM |
297 | #endif |
298 | ||
c2248c44 | 299 | HP_TIMING_NOW (GL(dl_cpuclock_offset)); |
c2248c44 | 300 | |
ea4f25a7 UD |
301 | /* Initialize the stack end variable. */ |
302 | __libc_stack_end = __builtin_frame_address (0); | |
303 | ||
c2248c44 RM |
304 | /* Call the OS-dependent function to set up life so we can do things like |
305 | file access. It will call `dl_main' (below) to do all the real work | |
306 | of the dynamic linker, and then unwind our frame and run the user | |
307 | entry point on the same stack we entered on. */ | |
ecdeaac0 | 308 | start_addr = _dl_sysdep_start (arg, &dl_main); |
c2248c44 RM |
309 | |
310 | #ifndef HP_TIMING_NONAVAIL | |
392a6b52 | 311 | hp_timing_t rtld_total_time; |
8c682bb2 | 312 | if (HP_SMALL_TIMING_AVAIL) |
c2248c44 RM |
313 | { |
314 | hp_timing_t end_time; | |
315 | ||
316 | /* Get the current time. */ | |
317 | HP_TIMING_NOW (end_time); | |
318 | ||
319 | /* Compute the difference. */ | |
320 | HP_TIMING_DIFF (rtld_total_time, start_time, end_time); | |
321 | } | |
322 | #endif | |
323 | ||
a1ffb40e | 324 | if (__glibc_unlikely (GLRO(dl_debug_mask) & DL_DEBUG_STATISTICS)) |
39b04aa3 UD |
325 | { |
326 | #ifndef HP_TIMING_NONAVAIL | |
327 | print_statistics (&rtld_total_time); | |
328 | #else | |
329 | print_statistics (NULL); | |
330 | #endif | |
331 | } | |
c2248c44 RM |
332 | |
333 | return start_addr; | |
334 | } | |
335 | ||
50746436 | 336 | static ElfW(Addr) __attribute_used__ internal_function |
d66e34cd RM |
337 | _dl_start (void *arg) |
338 | { | |
01d8e36d UD |
339 | #ifdef DONT_USE_BOOTSTRAP_MAP |
340 | # define bootstrap_map GL(dl_rtld_map) | |
341 | #else | |
4874b009 RM |
342 | struct dl_start_final_info info; |
343 | # define bootstrap_map info.l | |
739d440d | 344 | #endif |
d66e34cd | 345 | |
b1dbbaa4 | 346 | /* This #define produces dynamic linking inline functions for |
2f978feb UD |
347 | bootstrap relocation instead of general-purpose relocation. |
348 | Since ld.so must not have any undefined symbols the result | |
349 | is trivial: always the map of ld.so itself. */ | |
b1dbbaa4 | 350 | #define RTLD_BOOTSTRAP |
2f978feb | 351 | #define RESOLVE_MAP(sym, version, flags) (&bootstrap_map) |
b1dbbaa4 RM |
352 | #include "dynamic-link.h" |
353 | ||
8c682bb2 | 354 | if (HP_TIMING_INLINE && HP_SMALL_TIMING_AVAIL) |
4874b009 | 355 | #ifdef DONT_USE_BOOTSTRAP_MAP |
db276fa1 | 356 | HP_TIMING_NOW (start_time); |
4874b009 RM |
357 | #else |
358 | HP_TIMING_NOW (info.start_time); | |
359 | #endif | |
db276fa1 | 360 | |
e66d0a4c UD |
361 | /* Partly clean the `bootstrap_map' structure up. Don't use |
362 | `memset' since it might not be built in or inlined and we cannot | |
363 | make function calls at this point. Use '__builtin_memset' if we | |
01d8e36d UD |
364 | know it is available. We do not have to clear the memory if we |
365 | do not have to use the temporary bootstrap_map. Global variables | |
366 | are initialized to zero by default. */ | |
367 | #ifndef DONT_USE_BOOTSTRAP_MAP | |
368 | # ifdef HAVE_BUILTIN_MEMSET | |
e66d0a4c | 369 | __builtin_memset (bootstrap_map.l_info, '\0', sizeof (bootstrap_map.l_info)); |
01d8e36d | 370 | # else |
ce460d04 | 371 | for (size_t cnt = 0; |
264ec183 UD |
372 | cnt < sizeof (bootstrap_map.l_info) / sizeof (bootstrap_map.l_info[0]); |
373 | ++cnt) | |
374 | bootstrap_map.l_info[cnt] = 0; | |
01d8e36d | 375 | # endif |
e66d0a4c | 376 | #endif |
264ec183 | 377 | |
d66e34cd | 378 | /* Figure out the run-time load address of the dynamic linker itself. */ |
86d2c878 | 379 | bootstrap_map.l_addr = elf_machine_load_address (); |
d66e34cd | 380 | |
47707456 UD |
381 | /* Read our own dynamic section and fill in the info array. */ |
382 | bootstrap_map.l_ld = (void *) bootstrap_map.l_addr + elf_machine_dynamic (); | |
479aa8ec | 383 | elf_get_dynamic_info (&bootstrap_map, NULL); |
d66e34cd | 384 | |
11bf311e | 385 | #if NO_TLS_OFFSET != 0 |
299601a1 UD |
386 | bootstrap_map.l_tls_offset = NO_TLS_OFFSET; |
387 | #endif | |
388 | ||
d66e34cd | 389 | #ifdef ELF_MACHINE_BEFORE_RTLD_RELOC |
86d2c878 | 390 | ELF_MACHINE_BEFORE_RTLD_RELOC (bootstrap_map.l_info); |
d66e34cd RM |
391 | #endif |
392 | ||
32e6df36 UD |
393 | if (bootstrap_map.l_addr || ! bootstrap_map.l_info[VALIDX(DT_GNU_PRELINKED)]) |
394 | { | |
395 | /* Relocate ourselves so we can do normal function calls and | |
396 | data access using the global offset table. */ | |
397 | ||
3a62d00d | 398 | ELF_DYNAMIC_RELOCATE (&bootstrap_map, 0, 0, 0); |
32e6df36 | 399 | } |
f85f3563 | 400 | bootstrap_map.l_relocated = 1; |
421f82e5 | 401 | |
ea7eb7e3 UD |
402 | /* Please note that we don't allow profiling of this object and |
403 | therefore need not test whether we have to allocate the array | |
404 | for the relocation results (as done in dl-reloc.c). */ | |
421f82e5 | 405 | |
d66e34cd RM |
406 | /* Now life is sane; we can call functions and access global data. |
407 | Set up to use the operating system facilities, and find out from | |
408 | the operating system's program loader where to find the program | |
6a1db4ff UD |
409 | header table in core. Put the rest of _dl_start into a separate |
410 | function, that way the compiler cannot put accesses to the GOT | |
411 | before ELF_DYNAMIC_RELOCATE. */ | |
c0282c06 | 412 | { |
01d8e36d UD |
413 | #ifdef DONT_USE_BOOTSTRAP_MAP |
414 | ElfW(Addr) entry = _dl_start_final (arg); | |
415 | #else | |
4874b009 | 416 | ElfW(Addr) entry = _dl_start_final (arg, &info); |
01d8e36d | 417 | #endif |
c0282c06 UD |
418 | |
419 | #ifndef ELF_MACHINE_START_ADDRESS | |
420 | # define ELF_MACHINE_START_ADDRESS(map, start) (start) | |
421 | #endif | |
422 | ||
7cb92a99 | 423 | return ELF_MACHINE_START_ADDRESS (GL(dl_ns)[LM_ID_BASE]._ns_loaded, entry); |
c0282c06 | 424 | } |
6a1db4ff UD |
425 | } |
426 | ||
427 | ||
d66e34cd | 428 | |
d66e34cd RM |
429 | /* Now life is peachy; we can do all normal operations. |
430 | On to the real work. */ | |
431 | ||
993b3242 UD |
432 | /* Some helper functions. */ |
433 | ||
434 | /* Arguments to relocate_doit. */ | |
435 | struct relocate_args | |
436 | { | |
437 | struct link_map *l; | |
2ca285b0 | 438 | int reloc_mode; |
993b3242 UD |
439 | }; |
440 | ||
441 | struct map_args | |
442 | { | |
443 | /* Argument to map_doit. */ | |
acf869f4 | 444 | const char *str; |
f04b9a68 | 445 | struct link_map *loader; |
f04b9a68 | 446 | int mode; |
993b3242 | 447 | /* Return value of map_doit. */ |
f04b9a68 | 448 | struct link_map *map; |
993b3242 UD |
449 | }; |
450 | ||
9dcafc55 UD |
451 | struct dlmopen_args |
452 | { | |
453 | const char *fname; | |
454 | struct link_map *map; | |
455 | }; | |
456 | ||
457 | struct lookup_args | |
458 | { | |
459 | const char *name; | |
460 | struct link_map *map; | |
461 | void *result; | |
462 | }; | |
463 | ||
993b3242 UD |
464 | /* Arguments to version_check_doit. */ |
465 | struct version_check_args | |
466 | { | |
993b3242 | 467 | int doexit; |
145b8413 | 468 | int dotrace; |
993b3242 UD |
469 | }; |
470 | ||
471 | static void | |
472 | relocate_doit (void *a) | |
473 | { | |
474 | struct relocate_args *args = (struct relocate_args *) a; | |
475 | ||
2ca285b0 | 476 | _dl_relocate_object (args->l, args->l->l_scope, args->reloc_mode, 0); |
993b3242 UD |
477 | } |
478 | ||
479 | static void | |
480 | map_doit (void *a) | |
481 | { | |
be935610 | 482 | struct map_args *args = (struct map_args *) a; |
798212a0 PP |
483 | int type = (args->mode == __RTLD_OPENEXEC) ? lt_executable : lt_library; |
484 | args->map = _dl_map_object (args->loader, args->str, type, 0, | |
8e9f92e9 | 485 | args->mode, LM_ID_BASE); |
993b3242 UD |
486 | } |
487 | ||
9dcafc55 UD |
488 | static void |
489 | dlmopen_doit (void *a) | |
490 | { | |
491 | struct dlmopen_args *args = (struct dlmopen_args *) a; | |
8e9f92e9 AS |
492 | args->map = _dl_open (args->fname, |
493 | (RTLD_LAZY | __RTLD_DLOPEN | __RTLD_AUDIT | |
494 | | __RTLD_SECURE), | |
4243cbea | 495 | dl_main, LM_ID_NEWLM, _dl_argc, _dl_argv, |
9dcafc55 UD |
496 | __environ); |
497 | } | |
498 | ||
499 | static void | |
500 | lookup_doit (void *a) | |
501 | { | |
502 | struct lookup_args *args = (struct lookup_args *) a; | |
503 | const ElfW(Sym) *ref = NULL; | |
504 | args->result = NULL; | |
505 | lookup_t l = _dl_lookup_symbol_x (args->name, args->map, &ref, | |
506 | args->map->l_local_scope, NULL, 0, | |
507 | DL_LOOKUP_RETURN_NEWEST, NULL); | |
508 | if (ref != NULL) | |
509 | args->result = DL_SYMBOL_ADDRESS (l, ref); | |
510 | } | |
511 | ||
993b3242 UD |
512 | static void |
513 | version_check_doit (void *a) | |
514 | { | |
be935610 | 515 | struct version_check_args *args = (struct version_check_args *) a; |
c0f62c56 UD |
516 | if (_dl_check_all_versions (GL(dl_ns)[LM_ID_BASE]._ns_loaded, 1, |
517 | args->dotrace) && args->doexit) | |
993b3242 UD |
518 | /* We cannot start the application. Abort now. */ |
519 | _exit (1); | |
520 | } | |
521 | ||
ce37fa88 UD |
522 | |
523 | static inline struct link_map * | |
524 | find_needed (const char *name) | |
525 | { | |
c0f62c56 UD |
526 | struct r_scope_elem *scope = &GL(dl_ns)[LM_ID_BASE]._ns_loaded->l_searchlist; |
527 | unsigned int n = scope->r_nlist; | |
ce37fa88 | 528 | |
be935610 | 529 | while (n-- > 0) |
c0f62c56 UD |
530 | if (_dl_name_match_p (name, scope->r_list[n])) |
531 | return scope->r_list[n]; | |
ce37fa88 UD |
532 | |
533 | /* Should never happen. */ | |
534 | return NULL; | |
535 | } | |
536 | ||
537 | static int | |
538 | match_version (const char *string, struct link_map *map) | |
539 | { | |
a42195db | 540 | const char *strtab = (const void *) D_PTR (map, l_info[DT_STRTAB]); |
ce37fa88 UD |
541 | ElfW(Verdef) *def; |
542 | ||
b0982c4a | 543 | #define VERDEFTAG (DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGIDX (DT_VERDEF)) |
ce37fa88 UD |
544 | if (map->l_info[VERDEFTAG] == NULL) |
545 | /* The file has no symbol versioning. */ | |
546 | return 0; | |
547 | ||
548 | def = (ElfW(Verdef) *) ((char *) map->l_addr | |
549 | + map->l_info[VERDEFTAG]->d_un.d_ptr); | |
550 | while (1) | |
551 | { | |
552 | ElfW(Verdaux) *aux = (ElfW(Verdaux) *) ((char *) def + def->vd_aux); | |
553 | ||
554 | /* Compare the version strings. */ | |
555 | if (strcmp (string, strtab + aux->vda_name) == 0) | |
556 | /* Bingo! */ | |
557 | return 1; | |
558 | ||
559 | /* If no more definitions we failed to find what we want. */ | |
560 | if (def->vd_next == 0) | |
561 | break; | |
562 | ||
563 | /* Next definition. */ | |
564 | def = (ElfW(Verdef) *) ((char *) def + def->vd_next); | |
565 | } | |
566 | ||
567 | return 0; | |
568 | } | |
569 | ||
9dcafc55 UD |
570 | static bool tls_init_tp_called; |
571 | ||
572 | static void * | |
573 | init_tls (void) | |
574 | { | |
575 | /* Number of elements in the static TLS block. */ | |
576 | GL(dl_tls_static_nelem) = GL(dl_tls_max_dtv_idx); | |
577 | ||
578 | /* Do not do this twice. The audit interface might have required | |
579 | the DTV interfaces to be set up early. */ | |
580 | if (GL(dl_initial_dtv) != NULL) | |
581 | return NULL; | |
582 | ||
583 | /* Allocate the array which contains the information about the | |
584 | dtv slots. We allocate a few entries more than needed to | |
585 | avoid the need for reallocation. */ | |
586 | size_t nelem = GL(dl_tls_max_dtv_idx) + 1 + TLS_SLOTINFO_SURPLUS; | |
587 | ||
588 | /* Allocate. */ | |
589 | GL(dl_tls_dtv_slotinfo_list) = (struct dtv_slotinfo_list *) | |
590 | calloc (sizeof (struct dtv_slotinfo_list) | |
591 | + nelem * sizeof (struct dtv_slotinfo), 1); | |
592 | /* No need to check the return value. If memory allocation failed | |
593 | the program would have been terminated. */ | |
594 | ||
595 | struct dtv_slotinfo *slotinfo = GL(dl_tls_dtv_slotinfo_list)->slotinfo; | |
596 | GL(dl_tls_dtv_slotinfo_list)->len = nelem; | |
597 | GL(dl_tls_dtv_slotinfo_list)->next = NULL; | |
598 | ||
599 | /* Fill in the information from the loaded modules. No namespace | |
600 | but the base one can be filled at this time. */ | |
601 | assert (GL(dl_ns)[LM_ID_BASE + 1]._ns_loaded == NULL); | |
602 | int i = 0; | |
603 | for (struct link_map *l = GL(dl_ns)[LM_ID_BASE]._ns_loaded; l != NULL; | |
604 | l = l->l_next) | |
605 | if (l->l_tls_blocksize != 0) | |
606 | { | |
607 | /* This is a module with TLS data. Store the map reference. | |
608 | The generation counter is zero. */ | |
609 | slotinfo[i].map = l; | |
610 | /* slotinfo[i].gen = 0; */ | |
611 | ++i; | |
612 | } | |
613 | assert (i == GL(dl_tls_max_dtv_idx)); | |
614 | ||
615 | /* Compute the TLS offsets for the various blocks. */ | |
616 | _dl_determine_tlsoffset (); | |
617 | ||
618 | /* Construct the static TLS block and the dtv for the initial | |
619 | thread. For some platforms this will include allocating memory | |
620 | for the thread descriptor. The memory for the TLS block will | |
621 | never be freed. It should be allocated accordingly. The dtv | |
622 | array can be changed if dynamic loading requires it. */ | |
623 | void *tcbp = _dl_allocate_tls_storage (); | |
624 | if (tcbp == NULL) | |
625 | _dl_fatal_printf ("\ | |
626 | cannot allocate TLS data structures for initial thread"); | |
627 | ||
628 | /* Store for detection of the special case by __tls_get_addr | |
629 | so it knows not to pass this dtv to the normal realloc. */ | |
630 | GL(dl_initial_dtv) = GET_DTV (tcbp); | |
631 | ||
3d8c8bff | 632 | /* And finally install it for the main thread. */ |
774f9285 | 633 | const char *lossage = TLS_INIT_TP (tcbp); |
a1ffb40e | 634 | if (__glibc_unlikely (lossage != NULL)) |
9dcafc55 UD |
635 | _dl_fatal_printf ("cannot set up thread-local storage: %s\n", lossage); |
636 | tls_init_tp_called = true; | |
637 | ||
638 | return tcbp; | |
639 | } | |
9dcafc55 | 640 | |
bf2cc5fb | 641 | #ifdef _LIBC_REENTRANT |
ce460d04 RM |
642 | /* _dl_error_catch_tsd points to this for the single-threaded case. |
643 | It's reset by the thread library for multithreaded programs. */ | |
216455bc RM |
644 | void ** __attribute__ ((const)) |
645 | _dl_initial_error_catch_tsd (void) | |
ce460d04 RM |
646 | { |
647 | static void *data; | |
648 | return &data; | |
649 | } | |
bf2cc5fb | 650 | #endif |
ce460d04 | 651 | |
20fe49b9 UD |
652 | |
653 | static unsigned int | |
acf869f4 | 654 | do_preload (const char *fname, struct link_map *main_map, const char *where) |
20fe49b9 UD |
655 | { |
656 | const char *objname; | |
657 | const char *err_str = NULL; | |
658 | struct map_args args; | |
74780cf6 | 659 | bool malloced; |
20fe49b9 UD |
660 | |
661 | args.str = fname; | |
662 | args.loader = main_map; | |
8e9f92e9 | 663 | args.mode = __RTLD_SECURE; |
20fe49b9 UD |
664 | |
665 | unsigned int old_nloaded = GL(dl_ns)[LM_ID_BASE]._ns_nloaded; | |
666 | ||
74780cf6 | 667 | (void) _dl_catch_error (&objname, &err_str, &malloced, map_doit, &args); |
a1ffb40e | 668 | if (__glibc_unlikely (err_str != NULL)) |
20fe49b9 UD |
669 | { |
670 | _dl_error_printf ("\ | |
4db5b08f MS |
671 | ERROR: ld.so: object '%s' from %s cannot be preloaded (%s): ignored.\n", |
672 | fname, where, err_str); | |
20fe49b9 UD |
673 | /* No need to call free, this is still before |
674 | the libc's malloc is used. */ | |
675 | } | |
676 | else if (GL(dl_ns)[LM_ID_BASE]._ns_nloaded != old_nloaded) | |
677 | /* It is no duplicate. */ | |
678 | return 1; | |
679 | ||
680 | /* Nothing loaded. */ | |
681 | return 0; | |
682 | } | |
683 | ||
334fcf2a UD |
684 | #if defined SHARED && defined _LIBC_REENTRANT \ |
685 | && defined __rtld_lock_default_lock_recursive | |
20fe49b9 UD |
686 | static void |
687 | rtld_lock_default_lock_recursive (void *lock) | |
334fcf2a UD |
688 | { |
689 | __rtld_lock_default_lock_recursive (lock); | |
690 | } | |
691 | ||
20fe49b9 UD |
692 | static void |
693 | rtld_lock_default_unlock_recursive (void *lock) | |
334fcf2a UD |
694 | { |
695 | __rtld_lock_default_unlock_recursive (lock); | |
696 | } | |
697 | #endif | |
698 | ||
699 | ||
4c48ef06 UD |
700 | static void |
701 | security_init (void) | |
702 | { | |
703 | /* Set up the stack checker's canary. */ | |
965cb60a | 704 | uintptr_t stack_chk_guard = _dl_setup_stack_chk_guard (_dl_random); |
4c48ef06 UD |
705 | #ifdef THREAD_SET_STACK_GUARD |
706 | THREAD_SET_STACK_GUARD (stack_chk_guard); | |
707 | #else | |
708 | __stack_chk_guard = stack_chk_guard; | |
709 | #endif | |
710 | ||
711 | /* Set up the pointer guard as well, if necessary. */ | |
712 | if (GLRO(dl_pointer_guard)) | |
713 | { | |
965cb60a UD |
714 | uintptr_t pointer_chk_guard = _dl_setup_pointer_guard (_dl_random, |
715 | stack_chk_guard); | |
4c48ef06 UD |
716 | #ifdef THREAD_SET_POINTER_GUARD |
717 | THREAD_SET_POINTER_GUARD (pointer_chk_guard); | |
718 | #endif | |
719 | __pointer_chk_guard_local = pointer_chk_guard; | |
720 | } | |
965cb60a UD |
721 | |
722 | /* We do not need the _dl_random value anymore. The less | |
723 | information we leave behind, the better, so clear the | |
724 | variable. */ | |
725 | _dl_random = NULL; | |
4c48ef06 UD |
726 | } |
727 | ||
9cee5585 | 728 | #include "setup-vdso.h" |
4c48ef06 | 729 | |
392a6b52 UD |
730 | /* The library search path. */ |
731 | static const char *library_path attribute_relro; | |
732 | /* The list preloaded objects. */ | |
733 | static const char *preloadlist attribute_relro; | |
734 | /* Nonzero if information about versions has to be printed. */ | |
735 | static int version_info attribute_relro; | |
a1a9d215 | 736 | |
d66e34cd | 737 | static void |
266180eb | 738 | dl_main (const ElfW(Phdr) *phdr, |
72f70279 | 739 | ElfW(Word) phnum, |
3a56ea26 AK |
740 | ElfW(Addr) *user_entry, |
741 | ElfW(auxv_t) *auxv) | |
d66e34cd | 742 | { |
266180eb | 743 | const ElfW(Phdr) *ph; |
ea278354 | 744 | enum mode mode; |
c0f62c56 | 745 | struct link_map *main_map; |
14bab8de UD |
746 | size_t file_size; |
747 | char *file; | |
164a7164 | 748 | bool has_interp = false; |
77aba05b | 749 | unsigned int i; |
164a7164 UD |
750 | bool prelinked = false; |
751 | bool rtld_is_main = false; | |
5732c4df | 752 | #ifndef HP_TIMING_NONAVAIL |
db276fa1 UD |
753 | hp_timing_t start; |
754 | hp_timing_t stop; | |
755 | hp_timing_t diff; | |
5732c4df | 756 | #endif |
9dcafc55 | 757 | void *tcbp = NULL; |
d66e34cd | 758 | |
bf2cc5fb | 759 | #ifdef _LIBC_REENTRANT |
ce460d04 | 760 | /* Explicit initialization since the reloc would just be more work. */ |
216455bc | 761 | GL(dl_error_catch_tsd) = &_dl_initial_error_catch_tsd; |
bf2cc5fb | 762 | #endif |
ce460d04 | 763 | |
adc12574 | 764 | GL(dl_init_static_tls) = &_dl_nothread_init_static_tls; |
adc12574 | 765 | |
334fcf2a UD |
766 | #if defined SHARED && defined _LIBC_REENTRANT \ |
767 | && defined __rtld_lock_default_lock_recursive | |
768 | GL(dl_rtld_lock_recursive) = rtld_lock_default_lock_recursive; | |
769 | GL(dl_rtld_unlock_recursive) = rtld_lock_default_unlock_recursive; | |
770 | #endif | |
771 | ||
c70ba488 RM |
772 | /* The explicit initialization here is cheaper than processing the reloc |
773 | in the _rtld_local definition's initializer. */ | |
774 | GL(dl_make_stack_executable_hook) = &_dl_make_stack_executable; | |
775 | ||
ea278354 | 776 | /* Process the environment variable which control the behaviour. */ |
ba9fcb3f | 777 | process_envvars (&mode); |
3996f34b | 778 | |
ce6e047f | 779 | #ifndef HAVE_INLINED_SYSCALLS |
46ec036d | 780 | /* Set up a flag which tells we are just starting. */ |
9cf27b8d | 781 | _dl_starting_up = 1; |
ce6e047f | 782 | #endif |
46ec036d | 783 | |
a16956f3 | 784 | if (*user_entry == (ElfW(Addr)) ENTRY_POINT) |
0200214b RM |
785 | { |
786 | /* Ho ho. We are not the program interpreter! We are the program | |
787 | itself! This means someone ran ld.so as a command. Well, that | |
788 | might be convenient to do sometimes. We support it by | |
789 | interpreting the args like this: | |
790 | ||
791 | ld.so PROGRAM ARGS... | |
792 | ||
793 | The first argument is the name of a file containing an ELF | |
794 | executable we will load and run with the following arguments. | |
795 | To simplify life here, PROGRAM is searched for using the | |
796 | normal rules for shared objects, rather than $PATH or anything | |
797 | like that. We just load it and use its entry point; we don't | |
798 | pay attention to its PT_INTERP command (we are the interpreter | |
799 | ourselves). This is an easy way to test a new ld.so before | |
800 | installing it. */ | |
164a7164 | 801 | rtld_is_main = true; |
421f82e5 | 802 | |
ffee1316 | 803 | /* Note the place where the dynamic linker actually came from. */ |
e6caf4e1 | 804 | GL(dl_rtld_map).l_name = rtld_progname; |
6a76c115 | 805 | |
fd26970f | 806 | while (_dl_argc > 1) |
4243cbea | 807 | if (! strcmp (_dl_argv[1], "--list")) |
fd26970f UD |
808 | { |
809 | mode = list; | |
afdca0f2 | 810 | GLRO(dl_lazy) = -1; /* This means do no dependency analysis. */ |
61965e9b | 811 | |
fd26970f UD |
812 | ++_dl_skip_args; |
813 | --_dl_argc; | |
4243cbea | 814 | ++_dl_argv; |
fd26970f | 815 | } |
4243cbea | 816 | else if (! strcmp (_dl_argv[1], "--verify")) |
fd26970f UD |
817 | { |
818 | mode = verify; | |
6a76c115 | 819 | |
73d65cc3 SP |
820 | ++_dl_skip_args; |
821 | --_dl_argc; | |
4243cbea | 822 | ++_dl_argv; |
73d65cc3 | 823 | } |
4243cbea | 824 | else if (! strcmp (_dl_argv[1], "--inhibit-cache")) |
73d65cc3 SP |
825 | { |
826 | GLRO(dl_inhibit_cache) = 1; | |
fd26970f UD |
827 | ++_dl_skip_args; |
828 | --_dl_argc; | |
4243cbea | 829 | ++_dl_argv; |
fd26970f | 830 | } |
4243cbea | 831 | else if (! strcmp (_dl_argv[1], "--library-path") |
e6caf4e1 | 832 | && _dl_argc > 2) |
880f421f | 833 | { |
4243cbea | 834 | library_path = _dl_argv[2]; |
880f421f | 835 | |
310930c1 UD |
836 | _dl_skip_args += 2; |
837 | _dl_argc -= 2; | |
4243cbea | 838 | _dl_argv += 2; |
310930c1 | 839 | } |
4243cbea | 840 | else if (! strcmp (_dl_argv[1], "--inhibit-rpath") |
e6caf4e1 | 841 | && _dl_argc > 2) |
310930c1 | 842 | { |
4243cbea | 843 | GLRO(dl_inhibit_rpath) = _dl_argv[2]; |
310930c1 | 844 | |
74780cf6 UD |
845 | _dl_skip_args += 2; |
846 | _dl_argc -= 2; | |
4243cbea | 847 | _dl_argv += 2; |
74780cf6 | 848 | } |
4243cbea | 849 | else if (! strcmp (_dl_argv[1], "--audit") && _dl_argc > 2) |
74780cf6 | 850 | { |
4243cbea | 851 | process_dl_audit (_dl_argv[2]); |
74780cf6 | 852 | |
880f421f UD |
853 | _dl_skip_args += 2; |
854 | _dl_argc -= 2; | |
4243cbea | 855 | _dl_argv += 2; |
880f421f | 856 | } |
fd26970f UD |
857 | else |
858 | break; | |
d66e34cd | 859 | |
61eb22d3 UD |
860 | /* If we have no further argument the program was called incorrectly. |
861 | Grant the user some education. */ | |
862 | if (_dl_argc < 2) | |
35fc382a | 863 | _dl_fatal_printf ("\ |
2bcf29ba | 864 | Usage: ld.so [OPTION]... EXECUTABLE-FILE [ARGS-FOR-PROGRAM...]\n\ |
61eb22d3 UD |
865 | You have invoked `ld.so', the helper program for shared library executables.\n\ |
866 | This program usually lives in the file `/lib/ld.so', and special directives\n\ | |
867 | in executable files using ELF shared libraries tell the system's program\n\ | |
868 | loader to load the helper program from this file. This helper program loads\n\ | |
869 | the shared libraries needed by the program executable, prepares the program\n\ | |
870 | to run, and runs it. You may invoke this helper program directly from the\n\ | |
871 | command line to load and run an ELF executable file; this is like executing\n\ | |
872 | that file itself, but always uses this helper program from the file you\n\ | |
873 | specified, instead of the helper program file specified in the executable\n\ | |
874 | file you run. This is mostly of use for maintainers to test new versions\n\ | |
2bcf29ba UD |
875 | of this helper program; chances are you did not intend to run this program.\n\ |
876 | \n\ | |
b0a01055 UD |
877 | --list list all dependencies and how they are resolved\n\ |
878 | --verify verify that given object really is a dynamically linked\n\ | |
3a56ea26 | 879 | object we can handle\n\ |
73d65cc3 | 880 | --inhibit-cache Do not use " LD_SO_CACHE "\n\ |
b0a01055 | 881 | --library-path PATH use given PATH instead of content of the environment\n\ |
3a56ea26 | 882 | variable LD_LIBRARY_PATH\n\ |
fcf70d41 | 883 | --inhibit-rpath LIST ignore RUNPATH and RPATH information in object names\n\ |
3a56ea26 | 884 | in LIST\n\ |
7e342603 | 885 | --audit LIST use objects named in LIST as auditors\n"); |
61eb22d3 | 886 | |
0200214b RM |
887 | ++_dl_skip_args; |
888 | --_dl_argc; | |
4243cbea | 889 | ++_dl_argv; |
91f62ce6 | 890 | |
c70ba488 RM |
891 | /* The initialization of _dl_stack_flags done below assumes the |
892 | executable's PT_GNU_STACK may have been honored by the kernel, and | |
893 | so a PT_GNU_STACK with PF_X set means the stack started out with | |
894 | execute permission. However, this is not really true if the | |
895 | dynamic linker is the executable the kernel loaded. For this | |
896 | case, we must reinitialize _dl_stack_flags to match the dynamic | |
897 | linker itself. If the dynamic linker was built with a | |
898 | PT_GNU_STACK, then the kernel may have loaded us with a | |
899 | nonexecutable stack that we will have to make executable when we | |
900 | load the program below unless it has a PT_GNU_STACK indicating | |
901 | nonexecutable stack is ok. */ | |
902 | ||
903 | for (ph = phdr; ph < &phdr[phnum]; ++ph) | |
904 | if (ph->p_type == PT_GNU_STACK) | |
905 | { | |
906 | GL(dl_stack_flags) = ph->p_flags; | |
907 | break; | |
908 | } | |
909 | ||
9a821cf9 | 910 | if (__builtin_expect (mode, normal) == verify) |
2de99474 | 911 | { |
8e17ea58 UD |
912 | const char *objname; |
913 | const char *err_str = NULL; | |
993b3242 | 914 | struct map_args args; |
74780cf6 | 915 | bool malloced; |
2de99474 | 916 | |
e6caf4e1 | 917 | args.str = rtld_progname; |
f04b9a68 | 918 | args.loader = NULL; |
f04b9a68 | 919 | args.mode = __RTLD_OPENEXEC; |
74780cf6 UD |
920 | (void) _dl_catch_error (&objname, &err_str, &malloced, map_doit, |
921 | &args); | |
a1ffb40e | 922 | if (__glibc_unlikely (err_str != NULL)) |
e6caf4e1 UD |
923 | /* We don't free the returned string, the programs stops |
924 | anyway. */ | |
925 | _exit (EXIT_FAILURE); | |
2de99474 UD |
926 | } |
927 | else | |
db276fa1 UD |
928 | { |
929 | HP_TIMING_NOW (start); | |
798212a0 | 930 | _dl_map_object (NULL, rtld_progname, lt_executable, 0, |
c0f62c56 | 931 | __RTLD_OPENEXEC, LM_ID_BASE); |
db276fa1 | 932 | HP_TIMING_NOW (stop); |
61e0617a | 933 | |
db276fa1 UD |
934 | HP_TIMING_DIFF (load_time, start, stop); |
935 | } | |
2de99474 | 936 | |
c0f62c56 UD |
937 | /* Now the map for the main executable is available. */ |
938 | main_map = GL(dl_ns)[LM_ID_BASE]._ns_loaded; | |
939 | ||
f3fd569c DL |
940 | if (__builtin_expect (mode, normal) == normal |
941 | && GL(dl_rtld_map).l_info[DT_SONAME] != NULL | |
01f16ab0 UD |
942 | && main_map->l_info[DT_SONAME] != NULL |
943 | && strcmp ((const char *) D_PTR (&GL(dl_rtld_map), l_info[DT_STRTAB]) | |
944 | + GL(dl_rtld_map).l_info[DT_SONAME]->d_un.d_val, | |
945 | (const char *) D_PTR (main_map, l_info[DT_STRTAB]) | |
946 | + main_map->l_info[DT_SONAME]->d_un.d_val) == 0) | |
947 | _dl_fatal_printf ("loader cannot load itself\n"); | |
948 | ||
c0f62c56 UD |
949 | phdr = main_map->l_phdr; |
950 | phnum = main_map->l_phnum; | |
143e2b96 UD |
951 | /* We overwrite here a pointer to a malloc()ed string. But since |
952 | the malloc() implementation used at this point is the dummy | |
953 | implementations which has no real free() function it does not | |
954 | makes sense to free the old string first. */ | |
c0f62c56 UD |
955 | main_map->l_name = (char *) ""; |
956 | *user_entry = main_map->l_entry; | |
3a56ea26 | 957 | |
bc58236c | 958 | #ifdef HAVE_AUX_VECTOR |
3a56ea26 AK |
959 | /* Adjust the on-stack auxiliary vector so that it looks like the |
960 | binary was executed directly. */ | |
bc58236c | 961 | for (ElfW(auxv_t) *av = auxv; av->a_type != AT_NULL; av++) |
3a56ea26 AK |
962 | switch (av->a_type) |
963 | { | |
964 | case AT_PHDR: | |
4dd019e3 | 965 | av->a_un.a_val = (uintptr_t) phdr; |
3a56ea26 AK |
966 | break; |
967 | case AT_PHNUM: | |
968 | av->a_un.a_val = phnum; | |
969 | break; | |
970 | case AT_ENTRY: | |
971 | av->a_un.a_val = *user_entry; | |
972 | break; | |
5c349950 PP |
973 | case AT_EXECFN: |
974 | av->a_un.a_val = (uintptr_t) _dl_argv[0]; | |
975 | break; | |
3a56ea26 | 976 | } |
bc58236c | 977 | #endif |
0200214b RM |
978 | } |
979 | else | |
980 | { | |
981 | /* Create a link_map for the executable itself. | |
982 | This will be what dlopen on "" returns. */ | |
9fbdeb41 UD |
983 | main_map = _dl_new_object ((char *) "", "", lt_executable, NULL, |
984 | __RTLD_OPENEXEC, LM_ID_BASE); | |
9dcafc55 | 985 | assert (main_map != NULL); |
c0f62c56 UD |
986 | main_map->l_phdr = phdr; |
987 | main_map->l_phnum = phnum; | |
988 | main_map->l_entry = *user_entry; | |
da832465 | 989 | |
f0967738 AK |
990 | /* Even though the link map is not yet fully initialized we can add |
991 | it to the map list since there are no possible users running yet. */ | |
992 | _dl_add_to_namespace_list (main_map, LM_ID_BASE); | |
fa41c84d | 993 | assert (main_map == GL(dl_ns)[LM_ID_BASE]._ns_loaded); |
f0967738 | 994 | |
61e0617a UD |
995 | /* At this point we are in a bit of trouble. We would have to |
996 | fill in the values for l_dev and l_ino. But in general we | |
997 | do not know where the file is. We also do not handle AT_EXECFD | |
998 | even if it would be passed up. | |
999 | ||
1000 | We leave the values here defined to 0. This is normally no | |
1001 | problem as the program code itself is normally no shared | |
1002 | object and therefore cannot be loaded dynamically. Nothing | |
1003 | prevent the use of dynamic binaries and in these situations | |
1004 | we might get problems. We might not be able to find out | |
1005 | whether the object is already loaded. But since there is no | |
1006 | easy way out and because the dynamic binary must also not | |
1007 | have an SONAME we ignore this program for now. If it becomes | |
1008 | a problem we can force people using SONAMEs. */ | |
1009 | ||
97a51d8a UD |
1010 | /* We delay initializing the path structure until we got the dynamic |
1011 | information for the program. */ | |
0200214b RM |
1012 | } |
1013 | ||
c0f62c56 UD |
1014 | main_map->l_map_end = 0; |
1015 | main_map->l_text_end = 0; | |
052b6a6c | 1016 | /* Perhaps the executable has no PT_LOAD header entries at all. */ |
c0f62c56 | 1017 | main_map->l_map_start = ~0; |
c0f62c56 UD |
1018 | /* And it was opened directly. */ |
1019 | ++main_map->l_direct_opencount; | |
052b6a6c | 1020 | |
0200214b | 1021 | /* Scan the program header table for the dynamic section. */ |
72f70279 | 1022 | for (ph = phdr; ph < &phdr[phnum]; ++ph) |
0200214b RM |
1023 | switch (ph->p_type) |
1024 | { | |
da832465 UD |
1025 | case PT_PHDR: |
1026 | /* Find out the load address. */ | |
c0f62c56 | 1027 | main_map->l_addr = (ElfW(Addr)) phdr - ph->p_vaddr; |
da832465 | 1028 | break; |
0200214b RM |
1029 | case PT_DYNAMIC: |
1030 | /* This tells us where to find the dynamic section, | |
1031 | which tells us everything we need to do. */ | |
c0f62c56 | 1032 | main_map->l_ld = (void *) main_map->l_addr + ph->p_vaddr; |
0200214b RM |
1033 | break; |
1034 | case PT_INTERP: | |
1035 | /* This "interpreter segment" was used by the program loader to | |
1036 | find the program interpreter, which is this program itself, the | |
1037 | dynamic linker. We note what name finds us, so that a future | |
1038 | dlopen call or DT_NEEDED entry, for something that wants to link | |
1039 | against the dynamic linker as a shared library, will know that | |
1040 | the shared object is already loaded. */ | |
c0f62c56 | 1041 | _dl_rtld_libname.name = ((const char *) main_map->l_addr |
be935610 | 1042 | + ph->p_vaddr); |
752a2a50 | 1043 | /* _dl_rtld_libname.next = NULL; Already zero. */ |
d6b5d570 | 1044 | GL(dl_rtld_map).l_libname = &_dl_rtld_libname; |
f41c8091 UD |
1045 | |
1046 | /* Ordinarilly, we would get additional names for the loader from | |
1047 | our DT_SONAME. This can't happen if we were actually linked as | |
1048 | a static executable (detect this case when we have no DYNAMIC). | |
1049 | If so, assume the filename component of the interpreter path to | |
1050 | be our SONAME, and add it to our name list. */ | |
d6b5d570 | 1051 | if (GL(dl_rtld_map).l_ld == NULL) |
f41c8091 | 1052 | { |
88794e30 UD |
1053 | const char *p = NULL; |
1054 | const char *cp = _dl_rtld_libname.name; | |
1055 | ||
1056 | /* Find the filename part of the path. */ | |
1057 | while (*cp != '\0') | |
1058 | if (*cp++ == '/') | |
1059 | p = cp; | |
1060 | ||
1061 | if (p != NULL) | |
f41c8091 | 1062 | { |
88794e30 | 1063 | _dl_rtld_libname2.name = p; |
752a2a50 | 1064 | /* _dl_rtld_libname2.next = NULL; Already zero. */ |
f41c8091 UD |
1065 | _dl_rtld_libname.next = &_dl_rtld_libname2; |
1066 | } | |
1067 | } | |
1068 | ||
164a7164 | 1069 | has_interp = true; |
0200214b | 1070 | break; |
052b6a6c | 1071 | case PT_LOAD: |
052b6a6c UD |
1072 | { |
1073 | ElfW(Addr) mapstart; | |
2373b30e UD |
1074 | ElfW(Addr) allocend; |
1075 | ||
1076 | /* Remember where the main program starts in memory. */ | |
b92e3780 UD |
1077 | mapstart = (main_map->l_addr |
1078 | + (ph->p_vaddr & ~(GLRO(dl_pagesize) - 1))); | |
c0f62c56 UD |
1079 | if (main_map->l_map_start > mapstart) |
1080 | main_map->l_map_start = mapstart; | |
2373b30e UD |
1081 | |
1082 | /* Also where it ends. */ | |
c0f62c56 UD |
1083 | allocend = main_map->l_addr + ph->p_vaddr + ph->p_memsz; |
1084 | if (main_map->l_map_end < allocend) | |
1085 | main_map->l_map_end = allocend; | |
1086 | if ((ph->p_flags & PF_X) && allocend > main_map->l_text_end) | |
1087 | main_map->l_text_end = allocend; | |
052b6a6c UD |
1088 | } |
1089 | break; | |
9dcafc55 | 1090 | |
a334319f | 1091 | case PT_TLS: |
aed283dd UD |
1092 | if (ph->p_memsz > 0) |
1093 | { | |
1094 | /* Note that in the case the dynamic linker we duplicate work | |
1095 | here since we read the PT_TLS entry already in | |
1096 | _dl_start_final. But the result is repeatable so do not | |
1097 | check for this special but unimportant case. */ | |
c0f62c56 UD |
1098 | main_map->l_tls_blocksize = ph->p_memsz; |
1099 | main_map->l_tls_align = ph->p_align; | |
99fe3b0e | 1100 | if (ph->p_align == 0) |
c0f62c56 | 1101 | main_map->l_tls_firstbyte_offset = 0; |
99fe3b0e | 1102 | else |
c0f62c56 UD |
1103 | main_map->l_tls_firstbyte_offset = (ph->p_vaddr |
1104 | & (ph->p_align - 1)); | |
1105 | main_map->l_tls_initimage_size = ph->p_filesz; | |
1106 | main_map->l_tls_initimage = (void *) ph->p_vaddr; | |
aed283dd UD |
1107 | |
1108 | /* This image gets the ID one. */ | |
c0f62c56 | 1109 | GL(dl_tls_max_dtv_idx) = main_map->l_tls_modid = 1; |
aed283dd | 1110 | } |
9dcafc55 UD |
1111 | break; |
1112 | ||
ecdeaac0 RM |
1113 | case PT_GNU_STACK: |
1114 | GL(dl_stack_flags) = ph->p_flags; | |
1115 | break; | |
e8ed861d UD |
1116 | |
1117 | case PT_GNU_RELRO: | |
c0f62c56 UD |
1118 | main_map->l_relro_addr = ph->p_vaddr; |
1119 | main_map->l_relro_size = ph->p_memsz; | |
e8ed861d | 1120 | break; |
0200214b | 1121 | } |
11bf311e UD |
1122 | |
1123 | /* Adjust the address of the TLS initialization image in case | |
1124 | the executable is actually an ET_DYN object. */ | |
1125 | if (main_map->l_tls_initimage != NULL) | |
1126 | main_map->l_tls_initimage | |
1127 | = (char *) main_map->l_tls_initimage + main_map->l_addr; | |
c0f62c56 UD |
1128 | if (! main_map->l_map_end) |
1129 | main_map->l_map_end = ~0; | |
1130 | if (! main_map->l_text_end) | |
1131 | main_map->l_text_end = ~0; | |
d6b5d570 | 1132 | if (! GL(dl_rtld_map).l_libname && GL(dl_rtld_map).l_name) |
c84142e8 UD |
1133 | { |
1134 | /* We were invoked directly, so the program might not have a | |
1135 | PT_INTERP. */ | |
d6b5d570 | 1136 | _dl_rtld_libname.name = GL(dl_rtld_map).l_name; |
f0967738 | 1137 | /* _dl_rtld_libname.next = NULL; Already zero. */ |
d6b5d570 | 1138 | GL(dl_rtld_map).l_libname = &_dl_rtld_libname; |
c84142e8 | 1139 | } |
ffee1316 | 1140 | else |
d6b5d570 | 1141 | assert (GL(dl_rtld_map).l_libname); /* How else did we get here? */ |
0200214b | 1142 | |
9dcafc55 UD |
1143 | /* If the current libname is different from the SONAME, add the |
1144 | latter as well. */ | |
1145 | if (GL(dl_rtld_map).l_info[DT_SONAME] != NULL | |
1146 | && strcmp (GL(dl_rtld_map).l_libname->name, | |
1147 | (const char *) D_PTR (&GL(dl_rtld_map), l_info[DT_STRTAB]) | |
1148 | + GL(dl_rtld_map).l_info[DT_SONAME]->d_un.d_val) != 0) | |
1149 | { | |
1150 | static struct libname_list newname; | |
1151 | newname.name = ((char *) D_PTR (&GL(dl_rtld_map), l_info[DT_STRTAB]) | |
1152 | + GL(dl_rtld_map).l_info[DT_SONAME]->d_un.d_ptr); | |
1153 | newname.next = NULL; | |
1154 | newname.dont_free = 1; | |
1155 | ||
1156 | assert (GL(dl_rtld_map).l_libname->next == NULL); | |
1157 | GL(dl_rtld_map).l_libname->next = &newname; | |
1158 | } | |
1159 | /* The ld.so must be relocated since otherwise loading audit modules | |
1160 | will fail since they reuse the very same ld.so. */ | |
1161 | assert (GL(dl_rtld_map).l_relocated); | |
1162 | ||
9a51759b UD |
1163 | if (! rtld_is_main) |
1164 | { | |
1165 | /* Extract the contents of the dynamic section for easy access. */ | |
c0f62c56 | 1166 | elf_get_dynamic_info (main_map, NULL); |
efec5079 | 1167 | /* Set up our cache of pointers into the hash table. */ |
c0f62c56 | 1168 | _dl_setup_hash (main_map); |
9a51759b | 1169 | } |
0200214b | 1170 | |
9a821cf9 | 1171 | if (__builtin_expect (mode, normal) == verify) |
e2102c14 UD |
1172 | { |
1173 | /* We were called just to verify that this is a dynamic | |
1174 | executable using us as the program interpreter. Exit with an | |
1175 | error if we were not able to load the binary or no interpreter | |
1176 | is specified (i.e., this is no dynamically linked binary. */ | |
c0f62c56 | 1177 | if (main_map->l_ld == NULL) |
e2102c14 | 1178 | _exit (1); |
e2102c14 UD |
1179 | |
1180 | /* We allow here some platform specific code. */ | |
1181 | #ifdef DISTINGUISH_LIB_VERSIONS | |
1182 | DISTINGUISH_LIB_VERSIONS; | |
1183 | #endif | |
eb406346 | 1184 | _exit (has_interp ? 0 : 2); |
e2102c14 UD |
1185 | } |
1186 | ||
ab1d521d | 1187 | struct link_map **first_preload = &GL(dl_rtld_map).l_next; |
ab1d521d RM |
1188 | /* Set up the data structures for the system-supplied DSO early, |
1189 | so they can influence _dl_init_paths. */ | |
9cee5585 | 1190 | setup_vdso (main_map, &first_preload); |
ab1d521d RM |
1191 | |
1192 | #ifdef DL_SYSDEP_OSCHECK | |
ceb809dc | 1193 | DL_SYSDEP_OSCHECK (_dl_fatal_printf); |
ab1d521d RM |
1194 | #endif |
1195 | ||
1196 | /* Initialize the data structures for the search paths for shared | |
1197 | objects. */ | |
1198 | _dl_init_paths (library_path); | |
97a51d8a | 1199 | |
9dcafc55 | 1200 | /* Initialize _r_debug. */ |
29f97654 UD |
1201 | struct r_debug *r = _dl_debug_initialize (GL(dl_rtld_map).l_addr, |
1202 | LM_ID_BASE); | |
9dcafc55 UD |
1203 | r->r_state = RT_CONSISTENT; |
1204 | ||
0200214b | 1205 | /* Put the link_map for ourselves on the chain so it can be found by |
ceb2d9aa | 1206 | name. Note that at this point the global chain of link maps contains |
d6b5d570 UD |
1207 | exactly one element, which is pointed to by dl_loaded. */ |
1208 | if (! GL(dl_rtld_map).l_name) | |
ffee1316 RM |
1209 | /* If not invoked directly, the dynamic linker shared object file was |
1210 | found by the PT_INTERP name. */ | |
d6b5d570 UD |
1211 | GL(dl_rtld_map).l_name = (char *) GL(dl_rtld_map).l_libname->name; |
1212 | GL(dl_rtld_map).l_type = lt_library; | |
c0f62c56 UD |
1213 | main_map->l_next = &GL(dl_rtld_map); |
1214 | GL(dl_rtld_map).l_prev = main_map; | |
1215 | ++GL(dl_ns)[LM_ID_BASE]._ns_nloaded; | |
e8ed861d | 1216 | ++GL(dl_load_adds); |
0200214b | 1217 | |
97fd3a30 UD |
1218 | /* If LD_USE_LOAD_BIAS env variable has not been seen, default |
1219 | to not using bias for non-prelinked PIEs and libraries | |
1220 | and using it for executables or prelinked PIEs or libraries. */ | |
afdca0f2 | 1221 | if (GLRO(dl_use_load_bias) == (ElfW(Addr)) -2) |
c0f62c56 | 1222 | GLRO(dl_use_load_bias) = main_map->l_addr == 0 ? -1 : 0; |
97fd3a30 | 1223 | |
553eca26 | 1224 | /* Set up the program header information for the dynamic linker |
44c4e5d5 RM |
1225 | itself. It is needed in the dl_iterate_phdr callbacks. */ |
1226 | const ElfW(Ehdr) *rtld_ehdr; | |
1227 | ||
1228 | /* Starting from binutils-2.23, the linker will define the magic symbol | |
1229 | __ehdr_start to point to our own ELF header if it is visible in a | |
1230 | segment that also includes the phdrs. If that's not available, we use | |
1231 | the old method that assumes the beginning of the file is part of the | |
1232 | lowest-addressed PT_LOAD segment. */ | |
1233 | #ifdef HAVE_EHDR_START | |
1234 | extern const ElfW(Ehdr) __ehdr_start __attribute__ ((visibility ("hidden"))); | |
1235 | rtld_ehdr = &__ehdr_start; | |
1236 | #else | |
1237 | rtld_ehdr = (void *) GL(dl_rtld_map).l_map_start; | |
1238 | #endif | |
1239 | assert (rtld_ehdr->e_ehsize == sizeof *rtld_ehdr); | |
1240 | assert (rtld_ehdr->e_phentsize == sizeof (ElfW(Phdr))); | |
1241 | ||
1242 | const ElfW(Phdr) *rtld_phdr = (const void *) rtld_ehdr + rtld_ehdr->e_phoff; | |
1243 | ||
e8ed861d | 1244 | GL(dl_rtld_map).l_phdr = rtld_phdr; |
553eca26 UD |
1245 | GL(dl_rtld_map).l_phnum = rtld_ehdr->e_phnum; |
1246 | ||
9dcafc55 | 1247 | |
e8ed861d UD |
1248 | /* PT_GNU_RELRO is usually the last phdr. */ |
1249 | size_t cnt = rtld_ehdr->e_phnum; | |
1250 | while (cnt-- > 0) | |
1251 | if (rtld_phdr[cnt].p_type == PT_GNU_RELRO) | |
1252 | { | |
1253 | GL(dl_rtld_map).l_relro_addr = rtld_phdr[cnt].p_vaddr; | |
1254 | GL(dl_rtld_map).l_relro_size = rtld_phdr[cnt].p_memsz; | |
1255 | break; | |
1256 | } | |
1257 | ||
9dcafc55 UD |
1258 | /* Add the dynamic linker to the TLS list if it also uses TLS. */ |
1259 | if (GL(dl_rtld_map).l_tls_blocksize != 0) | |
1260 | /* Assign a module ID. Do this before loading any audit modules. */ | |
1261 | GL(dl_rtld_map).l_tls_modid = _dl_next_tls_modid (); | |
9dcafc55 UD |
1262 | |
1263 | /* If we have auditing DSOs to load, do it now. */ | |
a1ffb40e | 1264 | if (__glibc_unlikely (audit_list != NULL)) |
9dcafc55 UD |
1265 | { |
1266 | /* Iterate over all entries in the list. The order is important. */ | |
1267 | struct audit_ifaces *last_audit = NULL; | |
1268 | struct audit_list *al = audit_list->next; | |
3abee0b7 UD |
1269 | |
1270 | /* Since we start using the auditing DSOs right away we need to | |
1271 | initialize the data structures now. */ | |
1272 | tcbp = init_tls (); | |
1273 | ||
4c48ef06 UD |
1274 | /* Initialize security features. We need to do it this early |
1275 | since otherwise the constructors of the audit libraries will | |
1276 | use different values (especially the pointer guard) and will | |
1277 | fail later on. */ | |
1278 | security_init (); | |
1279 | ||
9dcafc55 UD |
1280 | do |
1281 | { | |
9dcafc55 UD |
1282 | int tls_idx = GL(dl_tls_max_dtv_idx); |
1283 | ||
1284 | /* Now it is time to determine the layout of the static TLS | |
1285 | block and allocate it for the initial thread. Note that we | |
1286 | always allocate the static block, we never defer it even if | |
1287 | no DF_STATIC_TLS bit is set. The reason is that we know | |
1288 | glibc will use the static model. */ | |
9dcafc55 UD |
1289 | struct dlmopen_args dlmargs; |
1290 | dlmargs.fname = al->name; | |
1291 | dlmargs.map = NULL; | |
1292 | ||
1293 | const char *objname; | |
1294 | const char *err_str = NULL; | |
74780cf6 UD |
1295 | bool malloced; |
1296 | (void) _dl_catch_error (&objname, &err_str, &malloced, dlmopen_doit, | |
1297 | &dlmargs); | |
a1ffb40e | 1298 | if (__glibc_unlikely (err_str != NULL)) |
9dcafc55 UD |
1299 | { |
1300 | not_loaded: | |
1301 | _dl_error_printf ("\ | |
1302 | ERROR: ld.so: object '%s' cannot be loaded as audit interface: %s; ignored.\n", | |
1303 | al->name, err_str); | |
74780cf6 UD |
1304 | if (malloced) |
1305 | free ((char *) err_str); | |
9dcafc55 UD |
1306 | } |
1307 | else | |
1308 | { | |
1309 | struct lookup_args largs; | |
1310 | largs.name = "la_version"; | |
1311 | largs.map = dlmargs.map; | |
1312 | ||
1313 | /* Check whether the interface version matches. */ | |
74780cf6 UD |
1314 | (void) _dl_catch_error (&objname, &err_str, &malloced, |
1315 | lookup_doit, &largs); | |
9dcafc55 UD |
1316 | |
1317 | unsigned int (*laversion) (unsigned int); | |
1318 | unsigned int lav; | |
1319 | if (err_str == NULL | |
1320 | && (laversion = largs.result) != NULL | |
1321 | && (lav = laversion (LAV_CURRENT)) > 0 | |
1322 | && lav <= LAV_CURRENT) | |
1323 | { | |
1324 | /* Allocate structure for the callback function pointers. | |
1325 | This call can never fail. */ | |
1326 | union | |
1327 | { | |
1328 | struct audit_ifaces ifaces; | |
1329 | #define naudit_ifaces 8 | |
1330 | void (*fptr[naudit_ifaces]) (void); | |
1331 | } *newp = malloc (sizeof (*newp)); | |
1332 | ||
1333 | /* Names of the auditing interfaces. All in one | |
1334 | long string. */ | |
1335 | static const char audit_iface_names[] = | |
1336 | "la_activity\0" | |
1337 | "la_objsearch\0" | |
1338 | "la_objopen\0" | |
1339 | "la_preinit\0" | |
1340 | #if __ELF_NATIVE_CLASS == 32 | |
1341 | "la_symbind32\0" | |
1342 | #elif __ELF_NATIVE_CLASS == 64 | |
1343 | "la_symbind64\0" | |
1344 | #else | |
1345 | # error "__ELF_NATIVE_CLASS must be defined" | |
1346 | #endif | |
1347 | #define STRING(s) __STRING (s) | |
1348 | "la_" STRING (ARCH_LA_PLTENTER) "\0" | |
1349 | "la_" STRING (ARCH_LA_PLTEXIT) "\0" | |
1350 | "la_objclose\0"; | |
1351 | unsigned int cnt = 0; | |
1352 | const char *cp = audit_iface_names; | |
1353 | do | |
1354 | { | |
1355 | largs.name = cp; | |
74780cf6 UD |
1356 | (void) _dl_catch_error (&objname, &err_str, &malloced, |
1357 | lookup_doit, &largs); | |
9dcafc55 UD |
1358 | |
1359 | /* Store the pointer. */ | |
1360 | if (err_str == NULL && largs.result != NULL) | |
1361 | { | |
1362 | newp->fptr[cnt] = largs.result; | |
1363 | ||
1364 | /* The dynamic linker link map is statically | |
1365 | allocated, initialize the data now. */ | |
1366 | GL(dl_rtld_map).l_audit[cnt].cookie | |
1367 | = (intptr_t) &GL(dl_rtld_map); | |
1368 | } | |
1369 | else | |
1370 | newp->fptr[cnt] = NULL; | |
1371 | ++cnt; | |
1372 | ||
1373 | cp = (char *) rawmemchr (cp, '\0') + 1; | |
1374 | } | |
1375 | while (*cp != '\0'); | |
1376 | assert (cnt == naudit_ifaces); | |
1377 | ||
1378 | /* Now append the new auditing interface to the list. */ | |
1379 | newp->ifaces.next = NULL; | |
1380 | if (last_audit == NULL) | |
1381 | last_audit = GLRO(dl_audit) = &newp->ifaces; | |
1382 | else | |
1383 | last_audit = last_audit->next = &newp->ifaces; | |
1384 | ++GLRO(dl_naudit); | |
1385 | ||
1386 | /* Mark the DSO as being used for auditing. */ | |
1387 | dlmargs.map->l_auditing = 1; | |
1388 | } | |
1389 | else | |
1390 | { | |
1391 | /* We cannot use the DSO, it does not have the | |
1392 | appropriate interfaces or it expects something | |
1393 | more recent. */ | |
1394 | #ifndef NDEBUG | |
1395 | Lmid_t ns = dlmargs.map->l_ns; | |
1396 | #endif | |
1397 | _dl_close (dlmargs.map); | |
1398 | ||
1399 | /* Make sure the namespace has been cleared entirely. */ | |
1400 | assert (GL(dl_ns)[ns]._ns_loaded == NULL); | |
1401 | assert (GL(dl_ns)[ns]._ns_nloaded == 0); | |
1402 | ||
9dcafc55 | 1403 | GL(dl_tls_max_dtv_idx) = tls_idx; |
9dcafc55 UD |
1404 | goto not_loaded; |
1405 | } | |
1406 | } | |
1407 | ||
1408 | al = al->next; | |
1409 | } | |
1410 | while (al != audit_list->next); | |
1411 | ||
1412 | /* If we have any auditing modules, announce that we already | |
1413 | have two objects loaded. */ | |
a1ffb40e | 1414 | if (__glibc_unlikely (GLRO(dl_naudit) > 0)) |
9dcafc55 UD |
1415 | { |
1416 | struct link_map *ls[2] = { main_map, &GL(dl_rtld_map) }; | |
1417 | ||
1418 | for (unsigned int outer = 0; outer < 2; ++outer) | |
1419 | { | |
1420 | struct audit_ifaces *afct = GLRO(dl_audit); | |
1421 | for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt) | |
1422 | { | |
1423 | if (afct->objopen != NULL) | |
1424 | { | |
1425 | ls[outer]->l_audit[cnt].bindflags | |
1426 | = afct->objopen (ls[outer], LM_ID_BASE, | |
1427 | &ls[outer]->l_audit[cnt].cookie); | |
1428 | ||
1429 | ls[outer]->l_audit_any_plt | |
1430 | |= ls[outer]->l_audit[cnt].bindflags != 0; | |
1431 | } | |
1432 | ||
1433 | afct = afct->next; | |
1434 | } | |
1435 | } | |
1436 | } | |
1437 | } | |
1438 | ||
d0503676 CD |
1439 | /* Keep track of the currently loaded modules to count how many |
1440 | non-audit modules which use TLS are loaded. */ | |
1441 | size_t count_modids = _dl_count_modids (); | |
1442 | ||
c63d8f80 UD |
1443 | /* Set up debugging before the debugger is notified for the first time. */ |
1444 | #ifdef ELF_MACHINE_DEBUG_SETUP | |
1445 | /* Some machines (e.g. MIPS) don't use DT_DEBUG in this way. */ | |
1446 | ELF_MACHINE_DEBUG_SETUP (main_map, r); | |
1447 | ELF_MACHINE_DEBUG_SETUP (&GL(dl_rtld_map), r); | |
1448 | #else | |
1449 | if (main_map->l_info[DT_DEBUG] != NULL) | |
1450 | /* There is a DT_DEBUG entry in the dynamic section. Fill it in | |
1451 | with the run-time address of the r_debug structure */ | |
1452 | main_map->l_info[DT_DEBUG]->d_un.d_ptr = (ElfW(Addr)) r; | |
1453 | ||
1454 | /* Fill in the pointer in the dynamic linker's own dynamic section, in | |
1455 | case you run gdb on the dynamic linker directly. */ | |
1456 | if (GL(dl_rtld_map).l_info[DT_DEBUG] != NULL) | |
1457 | GL(dl_rtld_map).l_info[DT_DEBUG]->d_un.d_ptr = (ElfW(Addr)) r; | |
1458 | #endif | |
1459 | ||
9dcafc55 UD |
1460 | /* We start adding objects. */ |
1461 | r->r_state = RT_ADD; | |
1462 | _dl_debug_state (); | |
815e6fa3 | 1463 | LIBC_PROBE (init_start, 2, LM_ID_BASE, r); |
9dcafc55 UD |
1464 | |
1465 | /* Auditing checkpoint: we are ready to signal that the initial map | |
1466 | is being constructed. */ | |
a1ffb40e | 1467 | if (__glibc_unlikely (GLRO(dl_naudit) > 0)) |
9dcafc55 UD |
1468 | { |
1469 | struct audit_ifaces *afct = GLRO(dl_audit); | |
1470 | for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt) | |
1471 | { | |
1472 | if (afct->activity != NULL) | |
1473 | afct->activity (&main_map->l_audit[cnt].cookie, LA_ACT_ADD); | |
1474 | ||
1475 | afct = afct->next; | |
1476 | } | |
1477 | } | |
1478 | ||
14bab8de | 1479 | /* We have two ways to specify objects to preload: via environment |
49c091e5 | 1480 | variable and via the file /etc/ld.so.preload. The latter can also |
14bab8de | 1481 | be used when security is enabled. */ |
ab1d521d | 1482 | assert (*first_preload == NULL); |
20fe49b9 UD |
1483 | struct link_map **preloads = NULL; |
1484 | unsigned int npreloads = 0; | |
14bab8de | 1485 | |
a1ffb40e | 1486 | if (__glibc_unlikely (preloadlist != NULL)) |
c4029823 | 1487 | { |
566efee2 UD |
1488 | /* The LD_PRELOAD environment variable gives list of libraries |
1489 | separated by white space or colons that are loaded before the | |
fd26970f UD |
1490 | executable's dependencies and prepended to the global scope |
1491 | list. If the binary is running setuid all elements | |
1492 | containing a '/' are ignored since it is insecure. */ | |
1493 | char *list = strdupa (preloadlist); | |
1494 | char *p; | |
db276fa1 UD |
1495 | |
1496 | HP_TIMING_NOW (start); | |
1497 | ||
9710f75d UD |
1498 | /* Prevent optimizing strsep. Speed is not important here. */ |
1499 | while ((p = (strsep) (&list, " :")) != NULL) | |
e2102c14 | 1500 | if (p[0] != '\0' |
6bc6bd3b | 1501 | && (__builtin_expect (! __libc_enable_secure, 1) |
db33f7d4 | 1502 | || strchr (p, '/') == NULL)) |
20fe49b9 | 1503 | npreloads += do_preload (p, main_map, "LD_PRELOAD"); |
db276fa1 UD |
1504 | |
1505 | HP_TIMING_NOW (stop); | |
1506 | HP_TIMING_DIFF (diff, start, stop); | |
1507 | HP_TIMING_ACCUM_NT (load_time, diff); | |
c4029823 UD |
1508 | } |
1509 | ||
761490a1 UD |
1510 | /* There usually is no ld.so.preload file, it should only be used |
1511 | for emergencies and testing. So the open call etc should usually | |
1512 | fail. Using access() on a non-existing file is faster than using | |
1513 | open(). So we do this first. If it succeeds we do almost twice | |
1514 | the work but this does not matter, since it is not for production | |
1515 | use. */ | |
1516 | static const char preload_file[] = "/etc/ld.so.preload"; | |
a1ffb40e | 1517 | if (__glibc_unlikely (__access (preload_file, R_OK) == 0)) |
14bab8de | 1518 | { |
761490a1 UD |
1519 | /* Read the contents of the file. */ |
1520 | file = _dl_sysdep_read_whole_file (preload_file, &file_size, | |
1521 | PROT_READ | PROT_WRITE); | |
a1ffb40e | 1522 | if (__glibc_unlikely (file != MAP_FAILED)) |
14bab8de | 1523 | { |
761490a1 UD |
1524 | /* Parse the file. It contains names of libraries to be loaded, |
1525 | separated by white spaces or `:'. It may also contain | |
1526 | comments introduced by `#'. */ | |
1527 | char *problem; | |
1528 | char *runp; | |
1529 | size_t rest; | |
1530 | ||
1531 | /* Eliminate comments. */ | |
e2102c14 | 1532 | runp = file; |
761490a1 UD |
1533 | rest = file_size; |
1534 | while (rest > 0) | |
1535 | { | |
1536 | char *comment = memchr (runp, '#', rest); | |
1537 | if (comment == NULL) | |
1538 | break; | |
1539 | ||
1540 | rest -= comment - runp; | |
1541 | do | |
1542 | *comment = ' '; | |
1543 | while (--rest > 0 && *++comment != '\n'); | |
1544 | } | |
1545 | ||
1546 | /* We have one problematic case: if we have a name at the end of | |
1547 | the file without a trailing terminating characters, we cannot | |
1548 | place the \0. Handle the case separately. */ | |
1549 | if (file[file_size - 1] != ' ' && file[file_size - 1] != '\t' | |
1550 | && file[file_size - 1] != '\n' && file[file_size - 1] != ':') | |
1551 | { | |
1552 | problem = &file[file_size]; | |
1553 | while (problem > file && problem[-1] != ' ' | |
1554 | && problem[-1] != '\t' | |
1555 | && problem[-1] != '\n' && problem[-1] != ':') | |
1556 | --problem; | |
1557 | ||
1558 | if (problem > file) | |
1559 | problem[-1] = '\0'; | |
1560 | } | |
1561 | else | |
1562 | { | |
1563 | problem = NULL; | |
1564 | file[file_size - 1] = '\0'; | |
1565 | } | |
f04b9a68 | 1566 | |
761490a1 | 1567 | HP_TIMING_NOW (start); |
f04b9a68 | 1568 | |
761490a1 UD |
1569 | if (file != problem) |
1570 | { | |
1571 | char *p; | |
1572 | runp = file; | |
1573 | while ((p = strsep (&runp, ": \t\n")) != NULL) | |
1574 | if (p[0] != '\0') | |
20fe49b9 | 1575 | npreloads += do_preload (p, main_map, preload_file); |
761490a1 UD |
1576 | } |
1577 | ||
1578 | if (problem != NULL) | |
1579 | { | |
1580 | char *p = strndupa (problem, file_size - (problem - file)); | |
20fe49b9 UD |
1581 | |
1582 | npreloads += do_preload (p, main_map, preload_file); | |
761490a1 | 1583 | } |
14bab8de | 1584 | |
761490a1 UD |
1585 | HP_TIMING_NOW (stop); |
1586 | HP_TIMING_DIFF (diff, start, stop); | |
1587 | HP_TIMING_ACCUM_NT (load_time, diff); | |
db276fa1 | 1588 | |
761490a1 UD |
1589 | /* We don't need the file anymore. */ |
1590 | __munmap (file, file_size); | |
1591 | } | |
14bab8de UD |
1592 | } |
1593 | ||
a1ffb40e | 1594 | if (__glibc_unlikely (*first_preload != NULL)) |
14bab8de UD |
1595 | { |
1596 | /* Set up PRELOADS with a vector of the preloaded libraries. */ | |
ab1d521d | 1597 | struct link_map *l = *first_preload; |
14bab8de | 1598 | preloads = __alloca (npreloads * sizeof preloads[0]); |
14bab8de UD |
1599 | i = 0; |
1600 | do | |
1601 | { | |
1602 | preloads[i++] = l; | |
1603 | l = l->l_next; | |
1604 | } while (l); | |
1605 | assert (i == npreloads); | |
1606 | } | |
1607 | ||
2064087b RM |
1608 | /* Load all the libraries specified by DT_NEEDED entries. If LD_PRELOAD |
1609 | specified some libraries to load, these are inserted before the actual | |
1610 | dependencies in the executable's searchlist for symbol resolution. */ | |
db276fa1 | 1611 | HP_TIMING_NOW (start); |
c0f62c56 | 1612 | _dl_map_object_deps (main_map, preloads, npreloads, mode == trace, 0); |
db276fa1 UD |
1613 | HP_TIMING_NOW (stop); |
1614 | HP_TIMING_DIFF (diff, start, stop); | |
1615 | HP_TIMING_ACCUM_NT (load_time, diff); | |
e3e35cfc | 1616 | |
20fe49b9 | 1617 | /* Mark all objects as being in the global scope. */ |
c0f62c56 | 1618 | for (i = main_map->l_searchlist.r_nlist; i > 0; ) |
20fe49b9 | 1619 | main_map->l_searchlist.r_list[--i]->l_global = 1; |
d66e34cd | 1620 | |
f9496a7b | 1621 | /* Remove _dl_rtld_map from the chain. */ |
d6b5d570 | 1622 | GL(dl_rtld_map).l_prev->l_next = GL(dl_rtld_map).l_next; |
20fe49b9 | 1623 | if (GL(dl_rtld_map).l_next != NULL) |
d6b5d570 | 1624 | GL(dl_rtld_map).l_next->l_prev = GL(dl_rtld_map).l_prev; |
f9496a7b | 1625 | |
20fe49b9 UD |
1626 | for (i = 1; i < main_map->l_searchlist.r_nlist; ++i) |
1627 | if (main_map->l_searchlist.r_list[i] == &GL(dl_rtld_map)) | |
1628 | break; | |
1629 | ||
1630 | bool rtld_multiple_ref = false; | |
a1ffb40e | 1631 | if (__glibc_likely (i < main_map->l_searchlist.r_nlist)) |
0200214b | 1632 | { |
f9496a7b RM |
1633 | /* Some DT_NEEDED entry referred to the interpreter object itself, so |
1634 | put it back in the list of visible objects. We insert it into the | |
1635 | chain in symbol search order because gdb uses the chain's order as | |
1636 | its symbol search order. */ | |
20fe49b9 UD |
1637 | rtld_multiple_ref = true; |
1638 | ||
c0f62c56 | 1639 | GL(dl_rtld_map).l_prev = main_map->l_searchlist.r_list[i - 1]; |
b2bcd61a | 1640 | if (__builtin_expect (mode, normal) == normal) |
3b3ddb4f | 1641 | { |
c0f62c56 UD |
1642 | GL(dl_rtld_map).l_next = (i + 1 < main_map->l_searchlist.r_nlist |
1643 | ? main_map->l_searchlist.r_list[i + 1] | |
3b3ddb4f | 1644 | : NULL); |
7775448e | 1645 | #ifdef NEED_DL_SYSINFO_DSO |
ab1d521d RM |
1646 | if (GLRO(dl_sysinfo_map) != NULL |
1647 | && GL(dl_rtld_map).l_prev->l_next == GLRO(dl_sysinfo_map) | |
1648 | && GL(dl_rtld_map).l_next != GLRO(dl_sysinfo_map)) | |
1649 | GL(dl_rtld_map).l_prev = GLRO(dl_sysinfo_map); | |
3b3ddb4f UD |
1650 | #endif |
1651 | } | |
b2bcd61a UD |
1652 | else |
1653 | /* In trace mode there might be an invisible object (which we | |
1654 | could not find) after the previous one in the search list. | |
1655 | In this case it doesn't matter much where we put the | |
1656 | interpreter object, so we just initialize the list pointer so | |
1657 | that the assertion below holds. */ | |
d6b5d570 | 1658 | GL(dl_rtld_map).l_next = GL(dl_rtld_map).l_prev->l_next; |
b2bcd61a | 1659 | |
d6b5d570 UD |
1660 | assert (GL(dl_rtld_map).l_prev->l_next == GL(dl_rtld_map).l_next); |
1661 | GL(dl_rtld_map).l_prev->l_next = &GL(dl_rtld_map); | |
3fb55878 | 1662 | if (GL(dl_rtld_map).l_next != NULL) |
f9496a7b | 1663 | { |
d6b5d570 UD |
1664 | assert (GL(dl_rtld_map).l_next->l_prev == GL(dl_rtld_map).l_prev); |
1665 | GL(dl_rtld_map).l_next->l_prev = &GL(dl_rtld_map); | |
f9496a7b | 1666 | } |
0200214b | 1667 | } |
d66e34cd | 1668 | |
c84142e8 UD |
1669 | /* Now let us see whether all libraries are available in the |
1670 | versions we need. */ | |
1671 | { | |
993b3242 UD |
1672 | struct version_check_args args; |
1673 | args.doexit = mode == normal; | |
145b8413 | 1674 | args.dotrace = mode == trace; |
993b3242 | 1675 | _dl_receive_error (print_missing_version, version_check_doit, &args); |
c84142e8 UD |
1676 | } |
1677 | ||
2d148689 RM |
1678 | /* We do not initialize any of the TLS functionality unless any of the |
1679 | initial modules uses TLS. This makes dynamic loading of modules with | |
1680 | TLS impossible, but to support it requires either eagerly doing setup | |
1681 | now or lazily doing it later. Doing it now makes us incompatible with | |
1682 | an old kernel that can't perform TLS_INIT_TP, even if no TLS is ever | |
1683 | used. Trying to do it lazily is too hairy to try when there could be | |
1684 | multiple threads (from a non-TLS-using libpthread). */ | |
9dcafc55 | 1685 | bool was_tls_init_tp_called = tls_init_tp_called; |
35f1e827 | 1686 | if (tcbp == NULL) |
9dcafc55 | 1687 | tcbp = init_tls (); |
0ecb606c | 1688 | |
a1ffb40e | 1689 | if (__glibc_likely (audit_list == NULL)) |
4c48ef06 UD |
1690 | /* Initialize security features. But only if we have not done it |
1691 | earlier. */ | |
1692 | security_init (); | |
827b7087 | 1693 | |
9a821cf9 | 1694 | if (__builtin_expect (mode, normal) != normal) |
0200214b RM |
1695 | { |
1696 | /* We were run just to list the shared libraries. It is | |
1697 | important that we do this before real relocation, because the | |
1698 | functions we call below for output may no longer work properly | |
1699 | after relocation. */ | |
81f3ac4c UD |
1700 | struct link_map *l; |
1701 | ||
afdca0f2 | 1702 | if (GLRO(dl_debug_mask) & DL_DEBUG_PRELINK) |
ceb2d9aa | 1703 | { |
c0f62c56 | 1704 | struct r_scope_elem *scope = &main_map->l_searchlist; |
ceb2d9aa | 1705 | |
81f3ac4c | 1706 | for (i = 0; i < scope->r_nlist; i++) |
32e6df36 | 1707 | { |
81f3ac4c UD |
1708 | l = scope->r_list [i]; |
1709 | if (l->l_faked) | |
32e6df36 | 1710 | { |
81f3ac4c UD |
1711 | _dl_printf ("\t%s => not found\n", l->l_libname->name); |
1712 | continue; | |
1713 | } | |
afdca0f2 UD |
1714 | if (_dl_name_match_p (GLRO(dl_trace_prelink), l)) |
1715 | GLRO(dl_trace_prelink_map) = l; | |
81f3ac4c | 1716 | _dl_printf ("\t%s => %s (0x%0*Zx, 0x%0*Zx)", |
b9375348 SP |
1717 | DSO_FILENAME (l->l_libname->name), |
1718 | DSO_FILENAME (l->l_name), | |
d347a4ab UD |
1719 | (int) sizeof l->l_map_start * 2, |
1720 | (size_t) l->l_map_start, | |
1721 | (int) sizeof l->l_addr * 2, | |
1722 | (size_t) l->l_addr); | |
11bf311e | 1723 | |
81f3ac4c UD |
1724 | if (l->l_tls_modid) |
1725 | _dl_printf (" TLS(0x%Zx, 0x%0*Zx)\n", l->l_tls_modid, | |
1726 | (int) sizeof l->l_tls_offset * 2, | |
d347a4ab | 1727 | (size_t) l->l_tls_offset); |
81f3ac4c | 1728 | else |
81f3ac4c | 1729 | _dl_printf ("\n"); |
32e6df36 | 1730 | } |
ceb2d9aa | 1731 | } |
7a11603d UD |
1732 | else if (GLRO(dl_debug_mask) & DL_DEBUG_UNUSED) |
1733 | { | |
1734 | /* Look through the dependencies of the main executable | |
1735 | and determine which of them is not actually | |
1736 | required. */ | |
c0f62c56 | 1737 | struct link_map *l = main_map; |
7a11603d UD |
1738 | |
1739 | /* Relocate the main executable. */ | |
2ca285b0 | 1740 | struct relocate_args args = { .l = l, |
3a62d00d AS |
1741 | .reloc_mode = ((GLRO(dl_lazy) |
1742 | ? RTLD_LAZY : 0) | |
1743 | | __RTLD_NOIFUNC) }; | |
7a11603d UD |
1744 | _dl_receive_error (print_unresolved, relocate_doit, &args); |
1745 | ||
1746 | /* This loop depends on the dependencies of the executable to | |
1747 | correspond in number and order to the DT_NEEDED entries. */ | |
c0f62c56 | 1748 | ElfW(Dyn) *dyn = main_map->l_ld; |
7a11603d UD |
1749 | bool first = true; |
1750 | while (dyn->d_tag != DT_NULL) | |
1751 | { | |
1752 | if (dyn->d_tag == DT_NEEDED) | |
1753 | { | |
1754 | l = l->l_next; | |
7775448e | 1755 | #ifdef NEED_DL_SYSINFO_DSO |
ff9f1c5f DM |
1756 | /* Skip the VDSO since it's not part of the list |
1757 | of objects we brought in via DT_NEEDED entries. */ | |
1758 | if (l == GLRO(dl_sysinfo_map)) | |
1759 | l = l->l_next; | |
1760 | #endif | |
7a11603d UD |
1761 | if (!l->l_used) |
1762 | { | |
1763 | if (first) | |
1764 | { | |
1765 | _dl_printf ("Unused direct dependencies:\n"); | |
1766 | first = false; | |
1767 | } | |
1768 | ||
1769 | _dl_printf ("\t%s\n", l->l_name); | |
1770 | } | |
1771 | } | |
1772 | ||
1773 | ++dyn; | |
1774 | } | |
1775 | ||
1776 | _exit (first != true); | |
1777 | } | |
c0f62c56 | 1778 | else if (! main_map->l_info[DT_NEEDED]) |
81f3ac4c UD |
1779 | _dl_printf ("\tstatically linked\n"); |
1780 | else | |
1781 | { | |
c0f62c56 | 1782 | for (l = main_map->l_next; l; l = l->l_next) |
81f3ac4c UD |
1783 | if (l->l_faked) |
1784 | /* The library was not found. */ | |
1785 | _dl_printf ("\t%s => not found\n", l->l_libname->name); | |
75489693 | 1786 | else if (strcmp (l->l_libname->name, l->l_name) == 0) |
7a11603d UD |
1787 | _dl_printf ("\t%s (0x%0*Zx)\n", l->l_libname->name, |
1788 | (int) sizeof l->l_map_start * 2, | |
1789 | (size_t) l->l_map_start); | |
81f3ac4c UD |
1790 | else |
1791 | _dl_printf ("\t%s => %s (0x%0*Zx)\n", l->l_libname->name, | |
1792 | l->l_name, (int) sizeof l->l_map_start * 2, | |
d347a4ab | 1793 | (size_t) l->l_map_start); |
81f3ac4c | 1794 | } |
1a3a58fd | 1795 | |
9a821cf9 | 1796 | if (__builtin_expect (mode, trace) != trace) |
5a47e7f2 | 1797 | for (i = 1; i < (unsigned int) _dl_argc; ++i) |
cddcfecf RM |
1798 | { |
1799 | const ElfW(Sym) *ref = NULL; | |
c0282c06 UD |
1800 | ElfW(Addr) loadbase; |
1801 | lookup_t result; | |
c0282c06 | 1802 | |
4243cbea | 1803 | result = _dl_lookup_symbol_x (_dl_argv[i], main_map, |
11bf311e UD |
1804 | &ref, main_map->l_scope, |
1805 | NULL, ELF_RTYPE_CLASS_PLT, | |
021723ab | 1806 | DL_LOOKUP_ADD_DEPENDENCY, NULL); |
c0282c06 UD |
1807 | |
1808 | loadbase = LOOKUP_VALUE_ADDRESS (result); | |
1809 | ||
35fc382a | 1810 | _dl_printf ("%s found at 0x%0*Zd in object at 0x%0*Zd\n", |
4243cbea | 1811 | _dl_argv[i], |
d347a4ab UD |
1812 | (int) sizeof ref->st_value * 2, |
1813 | (size_t) ref->st_value, | |
1814 | (int) sizeof loadbase * 2, (size_t) loadbase); | |
cddcfecf | 1815 | } |
ce37fa88 | 1816 | else |
fd26970f | 1817 | { |
20fe49b9 | 1818 | /* If LD_WARN is set, warn about undefined symbols. */ |
afdca0f2 | 1819 | if (GLRO(dl_lazy) >= 0 && GLRO(dl_verbose)) |
ce37fa88 UD |
1820 | { |
1821 | /* We have to do symbol dependency testing. */ | |
1822 | struct relocate_args args; | |
48b67d71 | 1823 | unsigned int i; |
993b3242 | 1824 | |
3a62d00d AS |
1825 | args.reloc_mode = ((GLRO(dl_lazy) ? RTLD_LAZY : 0) |
1826 | | __RTLD_NOIFUNC); | |
fd26970f | 1827 | |
48b67d71 AS |
1828 | i = main_map->l_searchlist.r_nlist; |
1829 | while (i-- > 0) | |
ce37fa88 | 1830 | { |
48b67d71 | 1831 | struct link_map *l = main_map->l_initfini[i]; |
d6b5d570 | 1832 | if (l != &GL(dl_rtld_map) && ! l->l_faked) |
ce37fa88 UD |
1833 | { |
1834 | args.l = l; | |
1835 | _dl_receive_error (print_unresolved, relocate_doit, | |
1836 | &args); | |
ce37fa88 | 1837 | } |
20fe49b9 | 1838 | } |
32e6df36 | 1839 | |
afdca0f2 | 1840 | if ((GLRO(dl_debug_mask) & DL_DEBUG_PRELINK) |
20fe49b9 | 1841 | && rtld_multiple_ref) |
e38c954b UD |
1842 | { |
1843 | /* Mark the link map as not yet relocated again. */ | |
1844 | GL(dl_rtld_map).l_relocated = 0; | |
11bf311e | 1845 | _dl_relocate_object (&GL(dl_rtld_map), |
3a62d00d | 1846 | main_map->l_scope, __RTLD_NOIFUNC, 0); |
e38c954b | 1847 | } |
3a56ea26 | 1848 | } |
b0982c4a | 1849 | #define VERNEEDTAG (DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGIDX (DT_VERNEED)) |
120b4c49 | 1850 | if (version_info) |
fd26970f | 1851 | { |
ce37fa88 UD |
1852 | /* Print more information. This means here, print information |
1853 | about the versions needed. */ | |
1854 | int first = 1; | |
c0f62c56 | 1855 | struct link_map *map; |
ce37fa88 | 1856 | |
c0f62c56 | 1857 | for (map = main_map; map != NULL; map = map->l_next) |
fd26970f | 1858 | { |
f41c8091 | 1859 | const char *strtab; |
ce37fa88 | 1860 | ElfW(Dyn) *dyn = map->l_info[VERNEEDTAG]; |
f41c8091 UD |
1861 | ElfW(Verneed) *ent; |
1862 | ||
1863 | if (dyn == NULL) | |
1864 | continue; | |
1865 | ||
a42195db | 1866 | strtab = (const void *) D_PTR (map, l_info[DT_STRTAB]); |
f41c8091 | 1867 | ent = (ElfW(Verneed) *) (map->l_addr + dyn->d_un.d_ptr); |
ce37fa88 | 1868 | |
f41c8091 | 1869 | if (first) |
ce37fa88 | 1870 | { |
35fc382a | 1871 | _dl_printf ("\n\tVersion information:\n"); |
f41c8091 UD |
1872 | first = 0; |
1873 | } | |
ce37fa88 | 1874 | |
b9375348 | 1875 | _dl_printf ("\t%s:\n", DSO_FILENAME (map->l_name)); |
f41c8091 UD |
1876 | |
1877 | while (1) | |
1878 | { | |
1879 | ElfW(Vernaux) *aux; | |
1880 | struct link_map *needed; | |
ce37fa88 | 1881 | |
f41c8091 UD |
1882 | needed = find_needed (strtab + ent->vn_file); |
1883 | aux = (ElfW(Vernaux) *) ((char *) ent + ent->vn_aux); | |
ce37fa88 UD |
1884 | |
1885 | while (1) | |
1886 | { | |
f41c8091 UD |
1887 | const char *fname = NULL; |
1888 | ||
f41c8091 | 1889 | if (needed != NULL |
ba9fcb3f UD |
1890 | && match_version (strtab + aux->vna_name, |
1891 | needed)) | |
f41c8091 UD |
1892 | fname = needed->l_name; |
1893 | ||
35fc382a UD |
1894 | _dl_printf ("\t\t%s (%s) %s=> %s\n", |
1895 | strtab + ent->vn_file, | |
1896 | strtab + aux->vna_name, | |
1897 | aux->vna_flags & VER_FLG_WEAK | |
1898 | ? "[WEAK] " : "", | |
1899 | fname ?: "not found"); | |
ce37fa88 | 1900 | |
f41c8091 UD |
1901 | if (aux->vna_next == 0) |
1902 | /* No more symbols. */ | |
ce37fa88 UD |
1903 | break; |
1904 | ||
f41c8091 UD |
1905 | /* Next symbol. */ |
1906 | aux = (ElfW(Vernaux) *) ((char *) aux | |
1907 | + aux->vna_next); | |
ce37fa88 | 1908 | } |
f41c8091 UD |
1909 | |
1910 | if (ent->vn_next == 0) | |
1911 | /* No more dependencies. */ | |
1912 | break; | |
1913 | ||
1914 | /* Next dependency. */ | |
1915 | ent = (ElfW(Verneed) *) ((char *) ent + ent->vn_next); | |
ce37fa88 | 1916 | } |
fd26970f | 1917 | } |
ce37fa88 | 1918 | } |
fd26970f | 1919 | } |
d66e34cd | 1920 | |
0200214b RM |
1921 | _exit (0); |
1922 | } | |
86d2c878 | 1923 | |
c0f62c56 | 1924 | if (main_map->l_info[ADDRIDX (DT_GNU_LIBLIST)] |
768027a4 UD |
1925 | && ! __builtin_expect (GLRO(dl_profile) != NULL, 0) |
1926 | && ! __builtin_expect (GLRO(dl_dynamic_weak), 0)) | |
32e6df36 UD |
1927 | { |
1928 | ElfW(Lib) *liblist, *liblistend; | |
1929 | struct link_map **r_list, **r_listend, *l; | |
c0f62c56 | 1930 | const char *strtab = (const void *) D_PTR (main_map, l_info[DT_STRTAB]); |
32e6df36 | 1931 | |
c0f62c56 | 1932 | assert (main_map->l_info[VALIDX (DT_GNU_LIBLISTSZ)] != NULL); |
32e6df36 | 1933 | liblist = (ElfW(Lib) *) |
c0f62c56 | 1934 | main_map->l_info[ADDRIDX (DT_GNU_LIBLIST)]->d_un.d_ptr; |
32e6df36 | 1935 | liblistend = (ElfW(Lib) *) |
c0f62c56 UD |
1936 | ((char *) liblist + |
1937 | main_map->l_info[VALIDX (DT_GNU_LIBLISTSZ)]->d_un.d_val); | |
1938 | r_list = main_map->l_searchlist.r_list; | |
1939 | r_listend = r_list + main_map->l_searchlist.r_nlist; | |
32e6df36 UD |
1940 | |
1941 | for (; r_list < r_listend && liblist < liblistend; r_list++) | |
1942 | { | |
1943 | l = *r_list; | |
1944 | ||
c0f62c56 | 1945 | if (l == main_map) |
32e6df36 UD |
1946 | continue; |
1947 | ||
1948 | /* If the library is not mapped where it should, fail. */ | |
1949 | if (l->l_addr) | |
1950 | break; | |
1951 | ||
1952 | /* Next, check if checksum matches. */ | |
1953 | if (l->l_info [VALIDX(DT_CHECKSUM)] == NULL | |
1954 | || l->l_info [VALIDX(DT_CHECKSUM)]->d_un.d_val | |
1955 | != liblist->l_checksum) | |
1956 | break; | |
1957 | ||
1958 | if (l->l_info [VALIDX(DT_GNU_PRELINKED)] == NULL | |
1959 | || l->l_info [VALIDX(DT_GNU_PRELINKED)]->d_un.d_val | |
1960 | != liblist->l_time_stamp) | |
1961 | break; | |
1962 | ||
1963 | if (! _dl_name_match_p (strtab + liblist->l_name, l)) | |
1964 | break; | |
1965 | ||
1966 | ++liblist; | |
1967 | } | |
1968 | ||
1969 | ||
1970 | if (r_list == r_listend && liblist == liblistend) | |
164a7164 | 1971 | prelinked = true; |
32e6df36 | 1972 | |
a1ffb40e | 1973 | if (__glibc_unlikely (GLRO(dl_debug_mask) & DL_DEBUG_LIBS)) |
b85a0f39 UD |
1974 | _dl_debug_printf ("\nprelink checking: %s\n", |
1975 | prelinked ? "ok" : "failed"); | |
32e6df36 UD |
1976 | } |
1977 | ||
ed20b3d9 | 1978 | |
c31e278f | 1979 | /* Now set up the variable which helps the assembler startup code. */ |
c0f62c56 | 1980 | GL(dl_ns)[LM_ID_BASE]._ns_main_searchlist = &main_map->l_searchlist; |
c31e278f UD |
1981 | |
1982 | /* Save the information about the original global scope list since | |
1983 | we need it in the memory handling later. */ | |
c0f62c56 | 1984 | GLRO(dl_initial_searchlist) = *GL(dl_ns)[LM_ID_BASE]._ns_main_searchlist; |
c31e278f | 1985 | |
e23fe25b AS |
1986 | /* Remember the last search directory added at startup, now that |
1987 | malloc will no longer be the one from dl-minimal.c. */ | |
1988 | GLRO(dl_init_all_dirs) = GL(dl_all_dirs); | |
1989 | ||
73d7af4f | 1990 | /* Print scope information. */ |
a1ffb40e | 1991 | if (__glibc_unlikely (GLRO(dl_debug_mask) & DL_DEBUG_SCOPES)) |
73d7af4f UD |
1992 | { |
1993 | _dl_debug_printf ("\nInitial object scopes\n"); | |
1994 | ||
1995 | for (struct link_map *l = main_map; l != NULL; l = l->l_next) | |
174baab3 | 1996 | _dl_show_scope (l, 0); |
73d7af4f UD |
1997 | } |
1998 | ||
32e6df36 UD |
1999 | if (prelinked) |
2000 | { | |
c0f62c56 | 2001 | if (main_map->l_info [ADDRIDX (DT_GNU_CONFLICT)] != NULL) |
32e6df36 UD |
2002 | { |
2003 | ElfW(Rela) *conflict, *conflictend; | |
2004 | #ifndef HP_TIMING_NONAVAIL | |
2005 | hp_timing_t start; | |
2006 | hp_timing_t stop; | |
2007 | #endif | |
2008 | ||
2009 | HP_TIMING_NOW (start); | |
c0f62c56 | 2010 | assert (main_map->l_info [VALIDX (DT_GNU_CONFLICTSZ)] != NULL); |
32e6df36 | 2011 | conflict = (ElfW(Rela) *) |
c0f62c56 | 2012 | main_map->l_info [ADDRIDX (DT_GNU_CONFLICT)]->d_un.d_ptr; |
32e6df36 | 2013 | conflictend = (ElfW(Rela) *) |
d89ae1d5 | 2014 | ((char *) conflict |
c0f62c56 UD |
2015 | + main_map->l_info [VALIDX (DT_GNU_CONFLICTSZ)]->d_un.d_val); |
2016 | _dl_resolve_conflicts (main_map, conflict, conflictend); | |
32e6df36 UD |
2017 | HP_TIMING_NOW (stop); |
2018 | HP_TIMING_DIFF (relocate_time, start, stop); | |
2019 | } | |
2020 | ||
d89ae1d5 RM |
2021 | |
2022 | /* Mark all the objects so we know they have been already relocated. */ | |
9dcafc55 | 2023 | for (struct link_map *l = main_map; l != NULL; l = l->l_next) |
e8648a5a UD |
2024 | { |
2025 | l->l_relocated = 1; | |
2026 | if (l->l_relro_size) | |
2027 | _dl_protect_relro (l); | |
9dcafc55 UD |
2028 | |
2029 | /* Add object to slot information data if necessasy. */ | |
2030 | if (l->l_tls_blocksize != 0 && tls_init_tp_called) | |
2031 | _dl_add_to_slotinfo (l); | |
e8648a5a | 2032 | } |
32e6df36 UD |
2033 | } |
2034 | else | |
164a7164 UD |
2035 | { |
2036 | /* Now we have all the objects loaded. Relocate them all except for | |
2037 | the dynamic linker itself. We do this in reverse order so that copy | |
2038 | relocs of earlier objects overwrite the data written by later | |
2039 | objects. We do not re-relocate the dynamic linker itself in this | |
2040 | loop because that could result in the GOT entries for functions we | |
2041 | call being changed, and that would break us. It is safe to relocate | |
2042 | the dynamic linker out of order because it has no copy relocs (we | |
2043 | know that because it is self-contained). */ | |
2044 | ||
afdca0f2 | 2045 | int consider_profiling = GLRO(dl_profile) != NULL; |
8b07d6a8 | 2046 | #ifndef HP_TIMING_NONAVAIL |
164a7164 UD |
2047 | hp_timing_t start; |
2048 | hp_timing_t stop; | |
8b07d6a8 | 2049 | #endif |
c0fb8a56 | 2050 | |
164a7164 | 2051 | /* If we are profiling we also must do lazy reloaction. */ |
afdca0f2 | 2052 | GLRO(dl_lazy) |= consider_profiling; |
c0fb8a56 | 2053 | |
164a7164 | 2054 | HP_TIMING_NOW (start); |
2bc17433 AS |
2055 | unsigned i = main_map->l_searchlist.r_nlist; |
2056 | while (i-- > 0) | |
164a7164 | 2057 | { |
2bc17433 AS |
2058 | struct link_map *l = main_map->l_initfini[i]; |
2059 | ||
164a7164 UD |
2060 | /* While we are at it, help the memory handling a bit. We have to |
2061 | mark some data structures as allocated with the fake malloc() | |
2062 | implementation in ld.so. */ | |
2063 | struct libname_list *lnp = l->l_libname->next; | |
752a2a50 | 2064 | |
164a7164 UD |
2065 | while (__builtin_expect (lnp != NULL, 0)) |
2066 | { | |
2067 | lnp->dont_free = 1; | |
2068 | lnp = lnp->next; | |
2069 | } | |
0479b305 AS |
2070 | /* Also allocated with the fake malloc(). */ |
2071 | l->l_free_initfini = 0; | |
752a2a50 | 2072 | |
164a7164 | 2073 | if (l != &GL(dl_rtld_map)) |
2ca285b0 | 2074 | _dl_relocate_object (l, l->l_scope, GLRO(dl_lazy) ? RTLD_LAZY : 0, |
154d10bd | 2075 | consider_profiling); |
be935610 | 2076 | |
9dcafc55 UD |
2077 | /* Add object to slot information data if necessasy. */ |
2078 | if (l->l_tls_blocksize != 0 && tls_init_tp_called) | |
2079 | _dl_add_to_slotinfo (l); | |
164a7164 | 2080 | } |
164a7164 UD |
2081 | HP_TIMING_NOW (stop); |
2082 | ||
2083 | HP_TIMING_DIFF (relocate_time, start, stop); | |
2084 | ||
164a7164 UD |
2085 | /* Now enable profiling if needed. Like the previous call, |
2086 | this has to go here because the calls it makes should use the | |
2087 | rtld versions of the functions (particularly calloc()), but it | |
2088 | needs to have _dl_profile_map set up by the relocator. */ | |
a1ffb40e | 2089 | if (__glibc_unlikely (GL(dl_profile_map) != NULL)) |
164a7164 | 2090 | /* We must prepare the profiling. */ |
53bfdc1c | 2091 | _dl_start_profile (); |
164a7164 | 2092 | } |
ac16e905 | 2093 | |
d0503676 CD |
2094 | if ((!was_tls_init_tp_called && GL(dl_tls_max_dtv_idx) > 0) |
2095 | || count_modids != _dl_count_modids ()) | |
35f1e827 | 2096 | ++GL(dl_tls_generation); |
9dcafc55 | 2097 | |
35f1e827 UD |
2098 | /* Now that we have completed relocation, the initializer data |
2099 | for the TLS blocks has its final values and we can copy them | |
2100 | into the main thread's TLS area, which we allocated above. */ | |
2101 | _dl_allocate_tls_init (tcbp); | |
a334319f | 2102 | |
3d8c8bff | 2103 | /* And finally install it for the main thread. */ |
35f1e827 UD |
2104 | if (! tls_init_tp_called) |
2105 | { | |
774f9285 | 2106 | const char *lossage = TLS_INIT_TP (tcbp); |
a1ffb40e | 2107 | if (__glibc_unlikely (lossage != NULL)) |
35f1e827 UD |
2108 | _dl_fatal_printf ("cannot set up thread-local storage: %s\n", |
2109 | lossage); | |
0ecb606c | 2110 | } |
0ecb606c | 2111 | |
e23fe25b AS |
2112 | /* Make sure no new search directories have been added. */ |
2113 | assert (GLRO(dl_init_all_dirs) == GL(dl_all_dirs)); | |
bc5fb037 | 2114 | |
cafdfdb6 RM |
2115 | if (! prelinked && rtld_multiple_ref) |
2116 | { | |
2117 | /* There was an explicit ref to the dynamic linker as a shared lib. | |
2118 | Re-relocate ourselves with user-controlled symbol definitions. | |
2119 | ||
2120 | We must do this after TLS initialization in case after this | |
2121 | re-relocation, we might call a user-supplied function | |
2122 | (e.g. calloc from _dl_relocate_object) that uses TLS data. */ | |
2123 | ||
2124 | #ifndef HP_TIMING_NONAVAIL | |
2125 | hp_timing_t start; | |
2126 | hp_timing_t stop; | |
2127 | hp_timing_t add; | |
2128 | #endif | |
2129 | ||
2130 | HP_TIMING_NOW (start); | |
2131 | /* Mark the link map as not yet relocated again. */ | |
2132 | GL(dl_rtld_map).l_relocated = 0; | |
c0a777e8 | 2133 | _dl_relocate_object (&GL(dl_rtld_map), main_map->l_scope, 0, 0); |
cafdfdb6 RM |
2134 | HP_TIMING_NOW (stop); |
2135 | HP_TIMING_DIFF (add, start, stop); | |
2136 | HP_TIMING_ACCUM_NT (relocate_time, add); | |
2137 | } | |
2138 | ||
bf8523c8 RM |
2139 | /* Do any necessary cleanups for the startup OS interface code. |
2140 | We do these now so that no calls are made after rtld re-relocation | |
2141 | which might be resolved to different functions than we expect. | |
2142 | We cannot do this before relocating the other objects because | |
2143 | _dl_relocate_object might need to call `mprotect' for DT_TEXTREL. */ | |
2144 | _dl_sysdep_start_cleanup (); | |
2145 | ||
9dcafc55 UD |
2146 | #ifdef SHARED |
2147 | /* Auditing checkpoint: we have added all objects. */ | |
a1ffb40e | 2148 | if (__glibc_unlikely (GLRO(dl_naudit) > 0)) |
9dcafc55 UD |
2149 | { |
2150 | struct link_map *head = GL(dl_ns)[LM_ID_BASE]._ns_loaded; | |
2151 | /* Do not call the functions for any auditing object. */ | |
2152 | if (head->l_auditing == 0) | |
2153 | { | |
2154 | struct audit_ifaces *afct = GLRO(dl_audit); | |
2155 | for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt) | |
2156 | { | |
2157 | if (afct->activity != NULL) | |
2158 | afct->activity (&head->l_audit[cnt].cookie, LA_ACT_CONSISTENT); | |
2159 | ||
2160 | afct = afct->next; | |
2161 | } | |
2162 | } | |
2163 | } | |
2164 | #endif | |
2165 | ||
2166 | /* Notify the debugger all new objects are now ready to go. We must re-get | |
2167 | the address since by now the variable might be in another object. */ | |
29f97654 | 2168 | r = _dl_debug_initialize (0, LM_ID_BASE); |
9dcafc55 | 2169 | r->r_state = RT_CONSISTENT; |
154d10bd | 2170 | _dl_debug_state (); |
815e6fa3 | 2171 | LIBC_PROBE (init_complete, 2, LM_ID_BASE, r); |
0200214b | 2172 | |
f57f8055 | 2173 | #if defined USE_LDCONFIG && !defined MAP_COPY |
08cac4ac | 2174 | /* We must munmap() the cache file. */ |
154d10bd | 2175 | _dl_unload_cache (); |
08cac4ac UD |
2176 | #endif |
2177 | ||
d66e34cd RM |
2178 | /* Once we return, _dl_sysdep_start will invoke |
2179 | the DT_INIT functions and then *USER_ENTRY. */ | |
2180 | } | |
fd26970f UD |
2181 | \f |
2182 | /* This is a little helper function for resolving symbols while | |
2183 | tracing the binary. */ | |
2184 | static void | |
c84142e8 UD |
2185 | print_unresolved (int errcode __attribute__ ((unused)), const char *objname, |
2186 | const char *errstring) | |
fd26970f | 2187 | { |
3996f34b | 2188 | if (objname[0] == '\0') |
b9375348 | 2189 | objname = RTLD_PROGNAME; |
35fc382a | 2190 | _dl_error_printf ("%s (%s)\n", errstring, objname); |
fd26970f | 2191 | } |
c84142e8 UD |
2192 | \f |
2193 | /* This is a little helper function for resolving symbols while | |
2194 | tracing the binary. */ | |
2195 | static void | |
2196 | print_missing_version (int errcode __attribute__ ((unused)), | |
2197 | const char *objname, const char *errstring) | |
2198 | { | |
b9375348 | 2199 | _dl_error_printf ("%s: %s: %s\n", RTLD_PROGNAME, |
35fc382a | 2200 | objname, errstring); |
c84142e8 | 2201 | } |
ea278354 | 2202 | \f |
7dea968e | 2203 | /* Nonzero if any of the debugging options is enabled. */ |
392a6b52 | 2204 | static int any_debug attribute_relro; |
7dea968e | 2205 | |
b5efde2f UD |
2206 | /* Process the string given as the parameter which explains which debugging |
2207 | options are enabled. */ | |
2208 | static void | |
14c44e2e | 2209 | process_dl_debug (const char *dl_debug) |
b5efde2f | 2210 | { |
3e2040c8 UD |
2211 | /* When adding new entries make sure that the maximal length of a name |
2212 | is correctly handled in the LD_DEBUG_HELP code below. */ | |
2213 | static const struct | |
2214 | { | |
379d4ec4 UD |
2215 | unsigned char len; |
2216 | const char name[10]; | |
3e2040c8 UD |
2217 | const char helptext[41]; |
2218 | unsigned short int mask; | |
2219 | } debopts[] = | |
2220 | { | |
379d4ec4 UD |
2221 | #define LEN_AND_STR(str) sizeof (str) - 1, str |
2222 | { LEN_AND_STR ("libs"), "display library search paths", | |
3e2040c8 | 2223 | DL_DEBUG_LIBS | DL_DEBUG_IMPCALLS }, |
379d4ec4 | 2224 | { LEN_AND_STR ("reloc"), "display relocation processing", |
3e2040c8 | 2225 | DL_DEBUG_RELOC | DL_DEBUG_IMPCALLS }, |
379d4ec4 | 2226 | { LEN_AND_STR ("files"), "display progress for input file", |
3e2040c8 | 2227 | DL_DEBUG_FILES | DL_DEBUG_IMPCALLS }, |
379d4ec4 | 2228 | { LEN_AND_STR ("symbols"), "display symbol table processing", |
3e2040c8 | 2229 | DL_DEBUG_SYMBOLS | DL_DEBUG_IMPCALLS }, |
379d4ec4 | 2230 | { LEN_AND_STR ("bindings"), "display information about symbol binding", |
3e2040c8 | 2231 | DL_DEBUG_BINDINGS | DL_DEBUG_IMPCALLS }, |
379d4ec4 | 2232 | { LEN_AND_STR ("versions"), "display version dependencies", |
3e2040c8 | 2233 | DL_DEBUG_VERSIONS | DL_DEBUG_IMPCALLS }, |
73d7af4f UD |
2234 | { LEN_AND_STR ("scopes"), "display scope information", |
2235 | DL_DEBUG_SCOPES }, | |
379d4ec4 | 2236 | { LEN_AND_STR ("all"), "all previous options combined", |
3e2040c8 | 2237 | DL_DEBUG_LIBS | DL_DEBUG_RELOC | DL_DEBUG_FILES | DL_DEBUG_SYMBOLS |
73d7af4f UD |
2238 | | DL_DEBUG_BINDINGS | DL_DEBUG_VERSIONS | DL_DEBUG_IMPCALLS |
2239 | | DL_DEBUG_SCOPES }, | |
379d4ec4 | 2240 | { LEN_AND_STR ("statistics"), "display relocation statistics", |
3e2040c8 | 2241 | DL_DEBUG_STATISTICS }, |
7a11603d UD |
2242 | { LEN_AND_STR ("unused"), "determined unused DSOs", |
2243 | DL_DEBUG_UNUSED }, | |
379d4ec4 | 2244 | { LEN_AND_STR ("help"), "display this help message and exit", |
3e2040c8 UD |
2245 | DL_DEBUG_HELP }, |
2246 | }; | |
2247 | #define ndebopts (sizeof (debopts) / sizeof (debopts[0])) | |
3e2040c8 | 2248 | |
379d4ec4 UD |
2249 | /* Skip separating white spaces and commas. */ |
2250 | while (*dl_debug != '\0') | |
b5efde2f | 2251 | { |
379d4ec4 | 2252 | if (*dl_debug != ' ' && *dl_debug != ',' && *dl_debug != ':') |
b5efde2f | 2253 | { |
3e2040c8 | 2254 | size_t cnt; |
379d4ec4 | 2255 | size_t len = 1; |
77aba05b | 2256 | |
379d4ec4 UD |
2257 | while (dl_debug[len] != '\0' && dl_debug[len] != ' ' |
2258 | && dl_debug[len] != ',' && dl_debug[len] != ':') | |
2259 | ++len; | |
14c44e2e | 2260 | |
3e2040c8 | 2261 | for (cnt = 0; cnt < ndebopts; ++cnt) |
379d4ec4 UD |
2262 | if (debopts[cnt].len == len |
2263 | && memcmp (dl_debug, debopts[cnt].name, len) == 0) | |
3e2040c8 | 2264 | { |
afdca0f2 | 2265 | GLRO(dl_debug_mask) |= debopts[cnt].mask; |
5688da55 | 2266 | any_debug = 1; |
3e2040c8 UD |
2267 | break; |
2268 | } | |
77aba05b | 2269 | |
3e2040c8 UD |
2270 | if (cnt == ndebopts) |
2271 | { | |
2272 | /* Display a warning and skip everything until next | |
2273 | separator. */ | |
2274 | char *copy = strndupa (dl_debug, len); | |
2275 | _dl_error_printf ("\ | |
2276 | warning: debug option `%s' unknown; try LD_DEBUG=help\n", copy); | |
379d4ec4 UD |
2277 | } |
2278 | ||
2279 | dl_debug += len; | |
2280 | continue; | |
3e2040c8 | 2281 | } |
379d4ec4 UD |
2282 | |
2283 | ++dl_debug; | |
3e2040c8 | 2284 | } |
77aba05b | 2285 | |
ff9f1c5f DM |
2286 | if (GLRO(dl_debug_mask) & DL_DEBUG_UNUSED) |
2287 | { | |
2288 | /* In order to get an accurate picture of whether a particular | |
2289 | DT_NEEDED entry is actually used we have to process both | |
2290 | the PLT and non-PLT relocation entries. */ | |
2291 | GLRO(dl_lazy) = 0; | |
2292 | } | |
2293 | ||
afdca0f2 | 2294 | if (GLRO(dl_debug_mask) & DL_DEBUG_HELP) |
3e2040c8 UD |
2295 | { |
2296 | size_t cnt; | |
14c44e2e | 2297 | |
3e2040c8 UD |
2298 | _dl_printf ("\ |
2299 | Valid options for the LD_DEBUG environment variable are:\n\n"); | |
db276fa1 | 2300 | |
3e2040c8 | 2301 | for (cnt = 0; cnt < ndebopts; ++cnt) |
37d8b778 UD |
2302 | _dl_printf (" %.*s%s%s\n", debopts[cnt].len, debopts[cnt].name, |
2303 | " " + debopts[cnt].len - 3, | |
3e2040c8 | 2304 | debopts[cnt].helptext); |
14c44e2e | 2305 | |
3e2040c8 UD |
2306 | _dl_printf ("\n\ |
2307 | To direct the debugging output into a file instead of standard output\n\ | |
2308 | a filename can be specified using the LD_DEBUG_OUTPUT environment variable.\n"); | |
2309 | _exit (0); | |
b5efde2f | 2310 | } |
b5efde2f UD |
2311 | } |
2312 | \f | |
9dcafc55 UD |
2313 | static void |
2314 | process_dl_audit (char *str) | |
2315 | { | |
2316 | /* The parameter is a colon separated list of DSO names. */ | |
2317 | char *p; | |
2318 | ||
2319 | while ((p = (strsep) (&str, ":")) != NULL) | |
2320 | if (p[0] != '\0' | |
6bc6bd3b | 2321 | && (__builtin_expect (! __libc_enable_secure, 1) |
9dcafc55 UD |
2322 | || strchr (p, '/') == NULL)) |
2323 | { | |
2324 | /* This is using the local malloc, not the system malloc. The | |
2325 | memory can never be freed. */ | |
2326 | struct audit_list *newp = malloc (sizeof (*newp)); | |
2327 | newp->name = p; | |
2328 | ||
2329 | if (audit_list == NULL) | |
2330 | audit_list = newp->next = newp; | |
2331 | else | |
2332 | { | |
2333 | newp->next = audit_list->next; | |
2334 | audit_list = audit_list->next = newp; | |
2335 | } | |
2336 | } | |
2337 | } | |
2338 | \f | |
ea278354 UD |
2339 | /* Process all environments variables the dynamic linker must recognize. |
2340 | Since all of them start with `LD_' we are a bit smarter while finding | |
2341 | all the entries. */ | |
9360906d | 2342 | extern char **_environ attribute_hidden; |
67c94753 | 2343 | |
d6b5d570 | 2344 | |
ea278354 | 2345 | static void |
ba9fcb3f | 2346 | process_envvars (enum mode *modep) |
ea278354 | 2347 | { |
67c94753 | 2348 | char **runp = _environ; |
ea278354 UD |
2349 | char *envline; |
2350 | enum mode mode = normal; | |
7dea968e | 2351 | char *debug_output = NULL; |
ea278354 UD |
2352 | |
2353 | /* This is the default place for profiling data file. */ | |
afdca0f2 | 2354 | GLRO(dl_profile_output) |
6bc6bd3b | 2355 | = &"/var/tmp\0/var/profile"[__libc_enable_secure ? 9 : 0]; |
ea278354 UD |
2356 | |
2357 | while ((envline = _dl_next_ld_env_entry (&runp)) != NULL) | |
2358 | { | |
379d4ec4 UD |
2359 | size_t len = 0; |
2360 | ||
2361 | while (envline[len] != '\0' && envline[len] != '=') | |
2362 | ++len; | |
ea278354 | 2363 | |
75e8d1f5 UD |
2364 | if (envline[len] != '=') |
2365 | /* This is a "LD_" variable at the end of the string without | |
2366 | a '=' character. Ignore it since otherwise we will access | |
2367 | invalid memory below. */ | |
67c94753 | 2368 | continue; |
75e8d1f5 | 2369 | |
67c94753 | 2370 | switch (len) |
ea278354 | 2371 | { |
14c44e2e UD |
2372 | case 4: |
2373 | /* Warning level, verbose or not. */ | |
67c94753 | 2374 | if (memcmp (envline, "WARN", 4) == 0) |
afdca0f2 | 2375 | GLRO(dl_verbose) = envline[5] != '\0'; |
14c44e2e | 2376 | break; |
ea278354 | 2377 | |
14c44e2e UD |
2378 | case 5: |
2379 | /* Debugging of the dynamic linker? */ | |
67c94753 | 2380 | if (memcmp (envline, "DEBUG", 5) == 0) |
9dcafc55 UD |
2381 | { |
2382 | process_dl_debug (&envline[6]); | |
2383 | break; | |
2384 | } | |
2385 | if (memcmp (envline, "AUDIT", 5) == 0) | |
2386 | process_dl_audit (&envline[6]); | |
14c44e2e | 2387 | break; |
b5efde2f | 2388 | |
14c44e2e UD |
2389 | case 7: |
2390 | /* Print information about versions. */ | |
67c94753 | 2391 | if (memcmp (envline, "VERBOSE", 7) == 0) |
14c44e2e | 2392 | { |
67c94753 | 2393 | version_info = envline[8] != '\0'; |
14c44e2e UD |
2394 | break; |
2395 | } | |
7dea968e | 2396 | |
14c44e2e | 2397 | /* List of objects to be preloaded. */ |
67c94753 | 2398 | if (memcmp (envline, "PRELOAD", 7) == 0) |
14c44e2e | 2399 | { |
67c94753 | 2400 | preloadlist = &envline[8]; |
14c44e2e UD |
2401 | break; |
2402 | } | |
120b4c49 | 2403 | |
14c44e2e | 2404 | /* Which shared object shall be profiled. */ |
c95f3fd4 | 2405 | if (memcmp (envline, "PROFILE", 7) == 0 && envline[8] != '\0') |
afdca0f2 | 2406 | GLRO(dl_profile) = &envline[8]; |
14c44e2e | 2407 | break; |
120b4c49 | 2408 | |
14c44e2e UD |
2409 | case 8: |
2410 | /* Do we bind early? */ | |
67c94753 | 2411 | if (memcmp (envline, "BIND_NOW", 8) == 0) |
f53c03c2 | 2412 | { |
afdca0f2 | 2413 | GLRO(dl_lazy) = envline[9] == '\0'; |
f53c03c2 UD |
2414 | break; |
2415 | } | |
67c94753 | 2416 | if (memcmp (envline, "BIND_NOT", 8) == 0) |
afdca0f2 | 2417 | GLRO(dl_bind_not) = envline[9] != '\0'; |
14c44e2e | 2418 | break; |
ea278354 | 2419 | |
14c44e2e UD |
2420 | case 9: |
2421 | /* Test whether we want to see the content of the auxiliary | |
2422 | array passed up from the kernel. */ | |
6bc6bd3b | 2423 | if (!__libc_enable_secure |
00a12162 | 2424 | && memcmp (envline, "SHOW_AUXV", 9) == 0) |
14c44e2e UD |
2425 | _dl_show_auxv (); |
2426 | break; | |
ea278354 | 2427 | |
12264bd7 | 2428 | case 10: |
3081378b | 2429 | /* Mask for the important hardware capabilities. */ |
67c94753 | 2430 | if (memcmp (envline, "HWCAP_MASK", 10) == 0) |
afdca0f2 UD |
2431 | GLRO(dl_hwcap_mask) = __strtoul_internal (&envline[11], NULL, |
2432 | 0, 0); | |
12264bd7 UD |
2433 | break; |
2434 | ||
f787edde UD |
2435 | case 11: |
2436 | /* Path where the binary is found. */ | |
6bc6bd3b | 2437 | if (!__libc_enable_secure |
67c94753 | 2438 | && memcmp (envline, "ORIGIN_PATH", 11) == 0) |
afdca0f2 | 2439 | GLRO(dl_origin_path) = &envline[12]; |
f787edde UD |
2440 | break; |
2441 | ||
14c44e2e | 2442 | case 12: |
dec126b4 | 2443 | /* The library search path. */ |
67c94753 | 2444 | if (memcmp (envline, "LIBRARY_PATH", 12) == 0) |
dec126b4 | 2445 | { |
67c94753 | 2446 | library_path = &envline[13]; |
dec126b4 UD |
2447 | break; |
2448 | } | |
2449 | ||
14c44e2e | 2450 | /* Where to place the profiling data file. */ |
67c94753 | 2451 | if (memcmp (envline, "DEBUG_OUTPUT", 12) == 0) |
14c44e2e | 2452 | { |
67c94753 | 2453 | debug_output = &envline[13]; |
14c44e2e UD |
2454 | break; |
2455 | } | |
ea278354 | 2456 | |
6bc6bd3b | 2457 | if (!__libc_enable_secure |
00a12162 | 2458 | && memcmp (envline, "DYNAMIC_WEAK", 12) == 0) |
afdca0f2 | 2459 | GLRO(dl_dynamic_weak) = 1; |
14c44e2e | 2460 | break; |
ea278354 | 2461 | |
97fd3a30 UD |
2462 | case 13: |
2463 | /* We might have some extra environment variable with length 13 | |
2464 | to handle. */ | |
2465 | #ifdef EXTRA_LD_ENVVARS_13 | |
2466 | EXTRA_LD_ENVVARS_13 | |
2467 | #endif | |
6bc6bd3b | 2468 | if (!__libc_enable_secure |
97fd3a30 | 2469 | && memcmp (envline, "USE_LOAD_BIAS", 13) == 0) |
827b7087 UD |
2470 | { |
2471 | GLRO(dl_use_load_bias) = envline[14] == '1' ? -1 : 0; | |
2472 | break; | |
2473 | } | |
2474 | ||
2475 | if (memcmp (envline, "POINTER_GUARD", 13) == 0) | |
0a21e400 | 2476 | GLRO(dl_pointer_guard) = envline[14] != '0'; |
97fd3a30 UD |
2477 | break; |
2478 | ||
14c44e2e UD |
2479 | case 14: |
2480 | /* Where to place the profiling data file. */ | |
6bc6bd3b | 2481 | if (!__libc_enable_secure |
3e2040c8 UD |
2482 | && memcmp (envline, "PROFILE_OUTPUT", 14) == 0 |
2483 | && envline[15] != '\0') | |
afdca0f2 | 2484 | GLRO(dl_profile_output) = &envline[15]; |
14c44e2e | 2485 | break; |
120b4c49 | 2486 | |
32e6df36 UD |
2487 | case 16: |
2488 | /* The mode of the dynamic linker can be set. */ | |
2489 | if (memcmp (envline, "TRACE_PRELINKING", 16) == 0) | |
2490 | { | |
2491 | mode = trace; | |
afdca0f2 UD |
2492 | GLRO(dl_verbose) = 1; |
2493 | GLRO(dl_debug_mask) |= DL_DEBUG_PRELINK; | |
2494 | GLRO(dl_trace_prelink) = &envline[17]; | |
32e6df36 UD |
2495 | } |
2496 | break; | |
2497 | ||
14c44e2e UD |
2498 | case 20: |
2499 | /* The mode of the dynamic linker can be set. */ | |
67c94753 | 2500 | if (memcmp (envline, "TRACE_LOADED_OBJECTS", 20) == 0) |
14c44e2e UD |
2501 | mode = trace; |
2502 | break; | |
e2102c14 UD |
2503 | |
2504 | /* We might have some extra environment variable to handle. This | |
2505 | is tricky due to the pre-processing of the length of the name | |
2506 | in the switch statement here. The code here assumes that added | |
2507 | environment variables have a different length. */ | |
2508 | #ifdef EXTRA_LD_ENVVARS | |
2509 | EXTRA_LD_ENVVARS | |
2510 | #endif | |
ea278354 UD |
2511 | } |
2512 | } | |
2513 | ||
3e2040c8 UD |
2514 | /* The caller wants this information. */ |
2515 | *modep = mode; | |
2516 | ||
4bae5567 UD |
2517 | /* Extra security for SUID binaries. Remove all dangerous environment |
2518 | variables. */ | |
6bc6bd3b | 2519 | if (__builtin_expect (__libc_enable_secure, 0)) |
4bae5567 | 2520 | { |
c95f3fd4 | 2521 | static const char unsecure_envvars[] = |
4bae5567 UD |
2522 | #ifdef EXTRA_UNSECURE_ENVVARS |
2523 | EXTRA_UNSECURE_ENVVARS | |
2524 | #endif | |
c95f3fd4 UD |
2525 | UNSECURE_ENVVARS; |
2526 | const char *nextp; | |
2527 | ||
2528 | nextp = unsecure_envvars; | |
2529 | do | |
2530 | { | |
2531 | unsetenv (nextp); | |
9710f75d UD |
2532 | /* We could use rawmemchr but this need not be fast. */ |
2533 | nextp = (char *) (strchr) (nextp, '\0') + 1; | |
c95f3fd4 UD |
2534 | } |
2535 | while (*nextp != '\0'); | |
74955460 UD |
2536 | |
2537 | if (__access ("/etc/suid-debug", F_OK) != 0) | |
3a56ea26 | 2538 | { |
00a12162 | 2539 | unsetenv ("MALLOC_CHECK_"); |
f57a3c94 | 2540 | GLRO(dl_debug_mask) = 0; |
3a56ea26 | 2541 | } |
f57a3c94 RM |
2542 | |
2543 | if (mode != normal) | |
2544 | _exit (5); | |
4bae5567 | 2545 | } |
7dea968e UD |
2546 | /* If we have to run the dynamic linker in debugging mode and the |
2547 | LD_DEBUG_OUTPUT environment variable is given, we write the debug | |
2548 | messages to this file. */ | |
3e2040c8 | 2549 | else if (any_debug && debug_output != NULL) |
7dea968e | 2550 | { |
5f2de337 UD |
2551 | #ifdef O_NOFOLLOW |
2552 | const int flags = O_WRONLY | O_APPEND | O_CREAT | O_NOFOLLOW; | |
2553 | #else | |
2554 | const int flags = O_WRONLY | O_APPEND | O_CREAT; | |
2555 | #endif | |
7a2fd787 UD |
2556 | size_t name_len = strlen (debug_output); |
2557 | char buf[name_len + 12]; | |
2558 | char *startp; | |
2559 | ||
2560 | buf[name_len + 11] = '\0'; | |
9710f75d | 2561 | startp = _itoa (__getpid (), &buf[name_len + 11], 10, 0); |
7a2fd787 UD |
2562 | *--startp = '.'; |
2563 | startp = memcpy (startp - name_len, debug_output, name_len); | |
2564 | ||
dd70526e UD |
2565 | GLRO(dl_debug_fd) = __open (startp, flags, DEFFILEMODE); |
2566 | if (GLRO(dl_debug_fd) == -1) | |
7dea968e | 2567 | /* We use standard output if opening the file failed. */ |
dd70526e | 2568 | GLRO(dl_debug_fd) = STDOUT_FILENO; |
7dea968e | 2569 | } |
ea278354 | 2570 | } |
db276fa1 UD |
2571 | |
2572 | ||
2573 | /* Print the various times we collected. */ | |
2574 | static void | |
ee600e3f | 2575 | __attribute ((noinline)) |
392a6b52 | 2576 | print_statistics (hp_timing_t *rtld_total_timep) |
db276fa1 | 2577 | { |
8b07d6a8 | 2578 | #ifndef HP_TIMING_NONAVAIL |
f457369d | 2579 | char buf[200]; |
db276fa1 UD |
2580 | char *cp; |
2581 | char *wp; | |
2582 | ||
2583 | /* Total time rtld used. */ | |
8c682bb2 | 2584 | if (HP_SMALL_TIMING_AVAIL) |
db276fa1 | 2585 | { |
392a6b52 | 2586 | HP_TIMING_PRINT (buf, sizeof (buf), *rtld_total_timep); |
154d10bd UD |
2587 | _dl_debug_printf ("\nruntime linker statistics:\n" |
2588 | " total startup time in dynamic loader: %s\n", buf); | |
db276fa1 | 2589 | |
392a6b52 | 2590 | /* Print relocation statistics. */ |
35fc382a | 2591 | char pbuf[30]; |
db276fa1 | 2592 | HP_TIMING_PRINT (buf, sizeof (buf), relocate_time); |
392a6b52 | 2593 | cp = _itoa ((1000ULL * relocate_time) / *rtld_total_timep, |
9710f75d | 2594 | pbuf + sizeof (pbuf), 10, 0); |
35fc382a UD |
2595 | wp = pbuf; |
2596 | switch (pbuf + sizeof (pbuf) - cp) | |
db276fa1 UD |
2597 | { |
2598 | case 3: | |
2599 | *wp++ = *cp++; | |
2600 | case 2: | |
2601 | *wp++ = *cp++; | |
2602 | case 1: | |
2603 | *wp++ = '.'; | |
2604 | *wp++ = *cp++; | |
2605 | } | |
2606 | *wp = '\0'; | |
154d10bd | 2607 | _dl_debug_printf ("\ |
3a56ea26 | 2608 | time needed for relocation: %s (%s%%)\n", buf, pbuf); |
db276fa1 | 2609 | } |
1531e094 | 2610 | #endif |
a21a20a3 UD |
2611 | |
2612 | unsigned long int num_relative_relocations = 0; | |
22c83193 | 2613 | for (Lmid_t ns = 0; ns < GL(dl_nns); ++ns) |
a21a20a3 | 2614 | { |
c120d94d UD |
2615 | if (GL(dl_ns)[ns]._ns_loaded == NULL) |
2616 | continue; | |
2617 | ||
c0f62c56 | 2618 | struct r_scope_elem *scope = &GL(dl_ns)[ns]._ns_loaded->l_searchlist; |
a21a20a3 | 2619 | |
c0f62c56 UD |
2620 | for (unsigned int i = 0; i < scope->r_nlist; i++) |
2621 | { | |
2622 | struct link_map *l = scope->r_list [i]; | |
2623 | ||
c120d94d | 2624 | if (l->l_addr != 0 && l->l_info[VERSYMIDX (DT_RELCOUNT)]) |
c0f62c56 UD |
2625 | num_relative_relocations |
2626 | += l->l_info[VERSYMIDX (DT_RELCOUNT)]->d_un.d_val; | |
c120d94d UD |
2627 | #ifndef ELF_MACHINE_REL_RELATIVE |
2628 | /* Relative relocations are processed on these architectures if | |
2629 | library is loaded to different address than p_vaddr or | |
2630 | if not prelinked. */ | |
2631 | if ((l->l_addr != 0 || !l->l_info[VALIDX(DT_GNU_PRELINKED)]) | |
2632 | && l->l_info[VERSYMIDX (DT_RELACOUNT)]) | |
2633 | #else | |
2634 | /* On e.g. IA-64 or Alpha, relative relocations are processed | |
2635 | only if library is loaded to different address than p_vaddr. */ | |
2636 | if (l->l_addr != 0 && l->l_info[VERSYMIDX (DT_RELACOUNT)]) | |
2637 | #endif | |
c0f62c56 UD |
2638 | num_relative_relocations |
2639 | += l->l_info[VERSYMIDX (DT_RELACOUNT)]->d_un.d_val; | |
2640 | } | |
a21a20a3 UD |
2641 | } |
2642 | ||
42af49f8 UD |
2643 | _dl_debug_printf (" number of relocations: %lu\n" |
2644 | " number of relocations from cache: %lu\n" | |
2645 | " number of relative relocations: %lu\n", | |
2646 | GL(dl_num_relocations), | |
2647 | GL(dl_num_cache_relocations), | |
154d10bd | 2648 | num_relative_relocations); |
db276fa1 | 2649 | |
1531e094 | 2650 | #ifndef HP_TIMING_NONAVAIL |
db276fa1 | 2651 | /* Time spend while loading the object and the dependencies. */ |
8c682bb2 | 2652 | if (HP_SMALL_TIMING_AVAIL) |
db276fa1 | 2653 | { |
35fc382a | 2654 | char pbuf[30]; |
db276fa1 | 2655 | HP_TIMING_PRINT (buf, sizeof (buf), load_time); |
392a6b52 | 2656 | cp = _itoa ((1000ULL * load_time) / *rtld_total_timep, |
9710f75d | 2657 | pbuf + sizeof (pbuf), 10, 0); |
35fc382a UD |
2658 | wp = pbuf; |
2659 | switch (pbuf + sizeof (pbuf) - cp) | |
db276fa1 UD |
2660 | { |
2661 | case 3: | |
2662 | *wp++ = *cp++; | |
2663 | case 2: | |
2664 | *wp++ = *cp++; | |
2665 | case 1: | |
2666 | *wp++ = '.'; | |
2667 | *wp++ = *cp++; | |
2668 | } | |
2669 | *wp = '\0'; | |
154d10bd | 2670 | _dl_debug_printf ("\ |
3a56ea26 | 2671 | time needed to load objects: %s (%s%%)\n", |
cff26a3e | 2672 | buf, pbuf); |
db276fa1 | 2673 | } |
1531e094 | 2674 | #endif |
db276fa1 | 2675 | } |