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d66e34cd | 1 | /* Run time dynamic linker. |
2b778ceb | 2 | Copyright (C) 1995-2021 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 | 16 | License along with the GNU C Library; if not, see |
5a82c748 | 17 | <https://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> |
8f480b4b | 35 | #include <dl-librecon.h> |
74955460 | 36 | #include <unsecvars.h> |
5688da55 | 37 | #include <dl-cache.h> |
2f4db0df | 38 | #include <dl-osinfo.h> |
5688da55 | 39 | #include <dl-procinfo.h> |
f753fa7d | 40 | #include <dl-prop.h> |
1bdda52f AZ |
41 | #include <dl-vdso.h> |
42 | #include <dl-vdso-setup.h> | |
5f5843e3 | 43 | #include <tls.h> |
815e6fa3 | 44 | #include <stap-probe.h> |
30950a5f | 45 | #include <stackinfo.h> |
329ea513 | 46 | #include <not-cancel.h> |
4c6e0415 | 47 | #include <array_length.h> |
ec935dea | 48 | #include <libc-early-init.h> |
2bf9e641 | 49 | #include <dl-main.h> |
4d098554 | 50 | #include <gnu/lib-names.h> |
86f65dff | 51 | #include <dl-tunables.h> |
d6d89608 | 52 | #include <get-dynamic-info.h> |
f5348425 | 53 | |
a853022c | 54 | #include <assert.h> |
f5348425 | 55 | |
d6d89608 AZ |
56 | /* This #define produces dynamic linking inline functions for |
57 | bootstrap relocation instead of general-purpose relocation. | |
58 | Since ld.so must not have any undefined symbols the result | |
59 | is trivial: always the map of ld.so itself. */ | |
60 | #define RTLD_BOOTSTRAP | |
61 | #define RESOLVE_MAP(map, scope, sym, version, flags) map | |
62 | #include "dynamic-link.h" | |
63 | ||
1e372ded AZ |
64 | /* Only enables rtld profiling for architectures which provides non generic |
65 | hp-timing support. The generic support requires either syscall | |
66 | (clock_gettime), which will incur in extra overhead on loading time. | |
67 | Using vDSO is also an option, but it will require extra support on loader | |
68 | to setup the vDSO pointer before its usage. */ | |
69 | #if HP_TIMING_INLINE | |
70 | # define RLTD_TIMING_DECLARE(var, classifier,...) \ | |
71 | classifier hp_timing_t var __VA_ARGS__ | |
72 | # define RTLD_TIMING_VAR(var) RLTD_TIMING_DECLARE (var, ) | |
73 | # define RTLD_TIMING_SET(var, value) (var) = (value) | |
74 | # define RTLD_TIMING_REF(var) &(var) | |
75 | ||
76 | static inline void | |
77 | rtld_timer_start (hp_timing_t *var) | |
78 | { | |
79 | HP_TIMING_NOW (*var); | |
80 | } | |
81 | ||
82 | static inline void | |
83 | rtld_timer_stop (hp_timing_t *var, hp_timing_t start) | |
84 | { | |
85 | hp_timing_t stop; | |
86 | HP_TIMING_NOW (stop); | |
87 | HP_TIMING_DIFF (*var, start, stop); | |
88 | } | |
89 | ||
90 | static inline void | |
91 | rtld_timer_accum (hp_timing_t *sum, hp_timing_t start) | |
92 | { | |
93 | hp_timing_t stop; | |
94 | rtld_timer_stop (&stop, start); | |
95 | HP_TIMING_ACCUM_NT(*sum, stop); | |
96 | } | |
97 | #else | |
98 | # define RLTD_TIMING_DECLARE(var, classifier...) | |
99 | # define RTLD_TIMING_SET(var, value) | |
100 | # define RTLD_TIMING_VAR(var) | |
101 | # define RTLD_TIMING_REF(var) 0 | |
102 | # define rtld_timer_start(var) | |
103 | # define rtld_timer_stop(var, start) | |
104 | # define rtld_timer_accum(sum, start) | |
105 | #endif | |
106 | ||
6ce3881d RM |
107 | /* Avoid PLT use for our local calls at startup. */ |
108 | extern __typeof (__mempcpy) __mempcpy attribute_hidden; | |
109 | ||
110 | /* GCC has mental blocks about _exit. */ | |
111 | extern __typeof (_exit) exit_internal asm ("_exit") attribute_hidden; | |
112 | #define _exit exit_internal | |
113 | ||
fd26970f | 114 | /* Helper function to handle errors while resolving symbols. */ |
c84142e8 UD |
115 | static void print_unresolved (int errcode, const char *objname, |
116 | const char *errsting); | |
117 | ||
118 | /* Helper function to handle errors when a version is missing. */ | |
119 | static void print_missing_version (int errcode, const char *objname, | |
120 | const char *errsting); | |
fd26970f | 121 | |
db276fa1 | 122 | /* Print the various times we collected. */ |
1e372ded | 123 | static void print_statistics (const hp_timing_t *total_timep); |
ea278354 | 124 | |
4c6e0415 FW |
125 | /* Creates an empty audit list. */ |
126 | static void audit_list_init (struct audit_list *); | |
127 | ||
128 | /* Add a string to the end of the audit list, for later parsing. Must | |
129 | not be called after audit_list_next. */ | |
130 | static void audit_list_add_string (struct audit_list *, const char *); | |
131 | ||
8f7a75d7 FW |
132 | /* Add the audit strings from the link map, found in the dynamic |
133 | segment at TG (either DT_AUDIT and DT_DEPAUDIT). Must be called | |
134 | before audit_list_next. */ | |
135 | static void audit_list_add_dynamic_tag (struct audit_list *, | |
136 | struct link_map *, | |
137 | unsigned int tag); | |
138 | ||
4c6e0415 FW |
139 | /* Extract the next audit module from the audit list. Only modules |
140 | for which dso_name_valid_for_suid is true are returned. Must be | |
8f7a75d7 FW |
141 | called after all the audit_list_add_string, |
142 | audit_list_add_dynamic_tags calls. */ | |
4c6e0415 | 143 | static const char *audit_list_next (struct audit_list *); |
74780cf6 | 144 | |
2bf9e641 FW |
145 | /* Initialize *STATE with the defaults. */ |
146 | static void dl_main_state_init (struct dl_main_state *state); | |
ea278354 UD |
147 | |
148 | /* Process all environments variables the dynamic linker must recognize. | |
149 | Since all of them start with `LD_' we are a bit smarter while finding | |
150 | all the entries. */ | |
851f32cf | 151 | extern char **_environ attribute_hidden; |
2bf9e641 | 152 | static void process_envvars (struct dl_main_state *state); |
ea278354 | 153 | |
11986c68 | 154 | #ifdef DL_ARGV_NOT_RELRO |
22aa06a5 | 155 | int _dl_argc attribute_hidden; |
11986c68 | 156 | char **_dl_argv = NULL; |
22aa06a5 RM |
157 | /* Nonzero if we were run directly. */ |
158 | unsigned int _dl_skip_args attribute_hidden; | |
11986c68 | 159 | #else |
22aa06a5 | 160 | int _dl_argc attribute_relro attribute_hidden; |
697afbe1 | 161 | char **_dl_argv attribute_relro = NULL; |
22aa06a5 | 162 | unsigned int _dl_skip_args attribute_relro attribute_hidden; |
11986c68 | 163 | #endif |
4243cbea | 164 | rtld_hidden_data_def (_dl_argv) |
5c82e15e | 165 | |
35f1e827 UD |
166 | #ifndef THREAD_SET_STACK_GUARD |
167 | /* Only exported for architectures that don't store the stack guard canary | |
168 | in thread local area. */ | |
169 | uintptr_t __stack_chk_guard attribute_relro; | |
170 | #endif | |
171 | ||
827b7087 UD |
172 | /* Only exported for architectures that don't store the pointer guard |
173 | value in thread local area. */ | |
7c241325 | 174 | uintptr_t __pointer_chk_guard_local attribute_relro attribute_hidden; |
827b7087 UD |
175 | #ifndef THREAD_SET_POINTER_GUARD |
176 | strong_alias (__pointer_chk_guard_local, __pointer_chk_guard) | |
177 | #endif | |
178 | ||
6d0ba622 FW |
179 | /* Check that AT_SECURE=0, or that the passed name does not contain |
180 | directories and is not overly long. Reject empty names | |
181 | unconditionally. */ | |
182 | static bool | |
183 | dso_name_valid_for_suid (const char *p) | |
184 | { | |
185 | if (__glibc_unlikely (__libc_enable_secure)) | |
186 | { | |
187 | /* Ignore pathnames with directories for AT_SECURE=1 | |
188 | programs, and also skip overlong names. */ | |
189 | size_t len = strlen (p); | |
190 | if (len >= SECURE_NAME_LIMIT || memchr (p, '/', len) != NULL) | |
191 | return false; | |
192 | } | |
193 | return *p != '\0'; | |
194 | } | |
827b7087 | 195 | |
4c6e0415 FW |
196 | static void |
197 | audit_list_init (struct audit_list *list) | |
9dcafc55 | 198 | { |
4c6e0415 FW |
199 | list->length = 0; |
200 | list->current_index = 0; | |
201 | list->current_tail = NULL; | |
202 | } | |
9dcafc55 | 203 | |
4c6e0415 FW |
204 | static void |
205 | audit_list_add_string (struct audit_list *list, const char *string) | |
81b82fb9 | 206 | { |
4c6e0415 FW |
207 | /* Empty strings do not load anything. */ |
208 | if (*string == '\0') | |
209 | return; | |
81b82fb9 | 210 | |
4c6e0415 FW |
211 | if (list->length == array_length (list->audit_strings)) |
212 | _dl_fatal_printf ("Fatal glibc error: Too many audit modules requested\n"); | |
81b82fb9 | 213 | |
4c6e0415 | 214 | list->audit_strings[list->length++] = string; |
81b82fb9 | 215 | |
4c6e0415 FW |
216 | /* Initialize processing of the first string for |
217 | audit_list_next. */ | |
218 | if (list->length == 1) | |
219 | list->current_tail = string; | |
81b82fb9 FW |
220 | } |
221 | ||
8f7a75d7 FW |
222 | static void |
223 | audit_list_add_dynamic_tag (struct audit_list *list, struct link_map *main_map, | |
224 | unsigned int tag) | |
225 | { | |
226 | ElfW(Dyn) *info = main_map->l_info[ADDRIDX (tag)]; | |
227 | const char *strtab = (const char *) D_PTR (main_map, l_info[DT_STRTAB]); | |
228 | if (info != NULL) | |
229 | audit_list_add_string (list, strtab + info->d_un.d_val); | |
230 | } | |
231 | ||
81b82fb9 | 232 | static const char * |
4c6e0415 | 233 | audit_list_next (struct audit_list *list) |
81b82fb9 | 234 | { |
4c6e0415 FW |
235 | if (list->current_tail == NULL) |
236 | return NULL; | |
237 | ||
238 | while (true) | |
81b82fb9 | 239 | { |
4c6e0415 FW |
240 | /* Advance to the next string in audit_strings if the current |
241 | string has been exhausted. */ | |
242 | while (*list->current_tail == '\0') | |
81b82fb9 | 243 | { |
4c6e0415 FW |
244 | ++list->current_index; |
245 | if (list->current_index == list->length) | |
81b82fb9 | 246 | { |
4c6e0415 FW |
247 | list->current_tail = NULL; |
248 | return NULL; | |
81b82fb9 | 249 | } |
4c6e0415 | 250 | list->current_tail = list->audit_strings[list->current_index]; |
81b82fb9 | 251 | } |
81b82fb9 | 252 | |
4c6e0415 FW |
253 | /* Split the in-string audit list at the next colon colon. */ |
254 | size_t len = strcspn (list->current_tail, ":"); | |
255 | if (len > 0 && len < sizeof (list->fname)) | |
256 | { | |
257 | memcpy (list->fname, list->current_tail, len); | |
258 | list->fname[len] = '\0'; | |
259 | } | |
260 | else | |
261 | /* Mark the name as unusable for dso_name_valid_for_suid. */ | |
262 | list->fname[0] = '\0'; | |
263 | ||
264 | /* Skip over the substring and the following delimiter. */ | |
265 | list->current_tail += len; | |
266 | if (*list->current_tail == ':') | |
267 | ++list->current_tail; | |
268 | ||
269 | /* If the name is valid, return it. */ | |
270 | if (dso_name_valid_for_suid (list->fname)) | |
271 | return list->fname; | |
272 | ||
273 | /* Otherwise wrap around to find the next list element. . */ | |
81b82fb9 | 274 | } |
81b82fb9 FW |
275 | } |
276 | ||
17796419 SN |
277 | /* Count audit modules before they are loaded so GLRO(dl_naudit) |
278 | is not yet usable. */ | |
279 | static size_t | |
280 | audit_list_count (struct audit_list *list) | |
281 | { | |
282 | /* Restore the audit_list iterator state at the end. */ | |
283 | const char *saved_tail = list->current_tail; | |
284 | size_t naudit = 0; | |
285 | ||
286 | assert (list->current_index == 0); | |
287 | while (audit_list_next (list) != NULL) | |
288 | naudit++; | |
289 | list->current_tail = saved_tail; | |
290 | list->current_index = 0; | |
291 | return naudit; | |
292 | } | |
293 | ||
2bf9e641 FW |
294 | static void |
295 | dl_main_state_init (struct dl_main_state *state) | |
296 | { | |
297 | audit_list_init (&state->audit_list); | |
298 | state->library_path = NULL; | |
27316f4a | 299 | state->library_path_source = NULL; |
2bf9e641 FW |
300 | state->preloadlist = NULL; |
301 | state->preloadarg = NULL; | |
dad90d52 FW |
302 | state->glibc_hwcaps_prepend = NULL; |
303 | state->glibc_hwcaps_mask = NULL; | |
2bf9e641 FW |
304 | state->mode = rtld_mode_normal; |
305 | state->any_debug = false; | |
306 | state->version_info = false; | |
307 | } | |
308 | ||
ce6e047f | 309 | #ifndef HAVE_INLINED_SYSCALLS |
39778c6c UD |
310 | /* Set nonzero during loading and initialization of executable and |
311 | libraries, cleared before the executable's entry point runs. This | |
312 | must not be initialized to nonzero, because the unused dynamic | |
313 | linker loaded in for libc.so's "ld.so.1" dep will provide the | |
314 | definition seen by libc.so's initializer; that value must be zero, | |
315 | and will be since that dynamic linker's _dl_start and dl_main will | |
316 | never be called. */ | |
e6caf4e1 | 317 | int _dl_starting_up = 0; |
9cf27b8d | 318 | rtld_hidden_def (_dl_starting_up) |
ce6e047f | 319 | #endif |
39778c6c | 320 | |
d6b5d570 UD |
321 | /* This is the structure which defines all variables global to ld.so |
322 | (except those which cannot be added for some reason). */ | |
5688da55 UD |
323 | struct rtld_global _rtld_global = |
324 | { | |
674ea882 L |
325 | /* Get architecture specific initializer. */ |
326 | #include <dl-procruntime.c> | |
30950a5f RA |
327 | /* Generally the default presumption without further information is an |
328 | * executable stack but this is not true for all platforms. */ | |
329 | ._dl_stack_flags = DEFAULT_STACK_PERMS, | |
ffa8d2a0 | 330 | #ifdef _LIBC_REENTRANT |
22c83193 | 331 | ._dl_load_lock = _RTLD_LOCK_RECURSIVE_INITIALIZER, |
5a2a1d75 | 332 | ._dl_load_write_lock = _RTLD_LOCK_RECURSIVE_INITIALIZER, |
83b53232 | 333 | ._dl_load_tls_lock = _RTLD_LOCK_RECURSIVE_INITIALIZER, |
ffa8d2a0 | 334 | #endif |
415ac3df UD |
335 | ._dl_nns = 1, |
336 | ._dl_ns = | |
337 | { | |
bea9b193 | 338 | #ifdef _LIBC_REENTRANT |
415ac3df UD |
339 | [LM_ID_BASE] = { ._ns_unique_sym_table |
340 | = { .lock = _RTLD_LOCK_RECURSIVE_INITIALIZER } } | |
bea9b193 | 341 | #endif |
415ac3df | 342 | } |
5688da55 | 343 | }; |
27a754a9 UD |
344 | /* If we would use strong_alias here the compiler would see a |
345 | non-hidden definition. This would undo the effect of the previous | |
7ee881f1 | 346 | declaration. So spell out what strong_alias does plus add the |
27a754a9 UD |
347 | visibility attribute. */ |
348 | extern struct rtld_global _rtld_local | |
349 | __attribute__ ((alias ("_rtld_global"), visibility ("hidden"))); | |
c0fb8a56 | 350 | |
afdca0f2 UD |
351 | |
352 | /* This variable is similar to _rtld_local, but all values are | |
353 | read-only after relocation. */ | |
354 | struct rtld_global_ro _rtld_global_ro attribute_relro = | |
355 | { | |
c31e278f UD |
356 | /* Get architecture specific initializer. */ |
357 | #include <dl-procinfo.c> | |
afdca0f2 UD |
358 | #ifdef NEED_DL_SYSINFO |
359 | ._dl_sysinfo = DL_SYSINFO_DEFAULT, | |
360 | #endif | |
dd70526e | 361 | ._dl_debug_fd = STDERR_FILENO, |
afdca0f2 UD |
362 | ._dl_use_load_bias = -2, |
363 | ._dl_correct_cache_id = _DL_CACHE_DEFAULT_ID, | |
ff08fc59 | 364 | #if !HAVE_TUNABLES |
afdca0f2 | 365 | ._dl_hwcap_mask = HWCAP_IMPORTANT, |
ff08fc59 | 366 | #endif |
afdca0f2 UD |
367 | ._dl_lazy = 1, |
368 | ._dl_fpu_control = _FPU_DEFAULT, | |
02d46fc4 | 369 | ._dl_pagesize = EXEC_PAGESIZE, |
73d65cc3 | 370 | ._dl_inhibit_cache = 0, |
154d10bd UD |
371 | |
372 | /* Function pointers. */ | |
154d10bd | 373 | ._dl_debug_printf = _dl_debug_printf, |
ab97ee8f | 374 | ._dl_mcount = _dl_mcount, |
021723ab | 375 | ._dl_lookup_symbol_x = _dl_lookup_symbol_x, |
9dcafc55 | 376 | ._dl_open = _dl_open, |
93025f93 | 377 | ._dl_close = _dl_close, |
b2964eb1 | 378 | ._dl_catch_error = _rtld_catch_error, |
fada9018 | 379 | ._dl_error_free = _dl_error_free, |
7c22c7ec UD |
380 | ._dl_tls_get_addr_soft = _dl_tls_get_addr_soft, |
381 | #ifdef HAVE_DL_DISCOVER_OSVERSION | |
382 | ._dl_discover_osversion = _dl_discover_osversion | |
383 | #endif | |
afdca0f2 UD |
384 | }; |
385 | /* If we would use strong_alias here the compiler would see a | |
386 | non-hidden definition. This would undo the effect of the previous | |
387 | declaration. So spell out was strong_alias does plus add the | |
388 | visibility attribute. */ | |
389 | extern struct rtld_global_ro _rtld_local_ro | |
390 | __attribute__ ((alias ("_rtld_global_ro"), visibility ("hidden"))); | |
391 | ||
392 | ||
67ddea92 | 393 | static void dl_main (const ElfW(Phdr) *phdr, ElfW(Word) phnum, |
3a56ea26 | 394 | ElfW(Addr) *user_entry, ElfW(auxv_t) *auxv); |
d66e34cd | 395 | |
392a6b52 | 396 | /* These two variables cannot be moved into .data.rel.ro. */ |
d6b5d570 UD |
397 | static struct libname_list _dl_rtld_libname; |
398 | static struct libname_list _dl_rtld_libname2; | |
86d2c878 | 399 | |
db276fa1 | 400 | /* Variable for statistics. */ |
1e372ded AZ |
401 | RLTD_TIMING_DECLARE (relocate_time, static); |
402 | RLTD_TIMING_DECLARE (load_time, static, attribute_relro); | |
403 | RLTD_TIMING_DECLARE (start_time, static, attribute_relro); | |
db276fa1 | 404 | |
2a76f7ef UD |
405 | /* Additional definitions needed by TLS initialization. */ |
406 | #ifdef TLS_INIT_HELPER | |
407 | TLS_INIT_HELPER | |
5e289179 UD |
408 | #endif |
409 | ||
410 | /* Helper function for syscall implementation. */ | |
411 | #ifdef DL_SYSINFO_IMPLEMENTATION | |
412 | DL_SYSINFO_IMPLEMENTATION | |
2a76f7ef UD |
413 | #endif |
414 | ||
01d8e36d UD |
415 | /* Before ld.so is relocated we must not access variables which need |
416 | relocations. This means variables which are exported. Variables | |
417 | declared as static are fine. If we can mark a variable hidden this | |
27a754a9 | 418 | is fine, too. The latter is important here. We can avoid setting |
01d8e36d UD |
419 | up a temporary link map for ld.so if we can mark _rtld_global as |
420 | hidden. */ | |
11bf311e | 421 | #ifdef PI_STATIC_AND_HIDDEN |
01d8e36d UD |
422 | # define DONT_USE_BOOTSTRAP_MAP 1 |
423 | #endif | |
424 | ||
425 | #ifdef DONT_USE_BOOTSTRAP_MAP | |
426 | static ElfW(Addr) _dl_start_final (void *arg); | |
427 | #else | |
4874b009 RM |
428 | struct dl_start_final_info |
429 | { | |
430 | struct link_map l; | |
1e372ded | 431 | RTLD_TIMING_VAR (start_time); |
4874b009 | 432 | }; |
01d8e36d | 433 | static ElfW(Addr) _dl_start_final (void *arg, |
4874b009 | 434 | struct dl_start_final_info *info); |
01d8e36d | 435 | #endif |
6a1db4ff | 436 | |
65da9563 RM |
437 | /* These defined magically in the linker script. */ |
438 | extern char _begin[] attribute_hidden; | |
eec8b6ca | 439 | extern char _etext[] attribute_hidden; |
65da9563 RM |
440 | extern char _end[] attribute_hidden; |
441 | ||
442 | ||
b1dbbaa4 RM |
443 | #ifdef RTLD_START |
444 | RTLD_START | |
445 | #else | |
eaad82e0 | 446 | # error "sysdeps/MACHINE/dl-machine.h fails to define RTLD_START" |
b1dbbaa4 RM |
447 | #endif |
448 | ||
c2248c44 RM |
449 | /* This is the second half of _dl_start (below). It can be inlined safely |
450 | under DONT_USE_BOOTSTRAP_MAP, where it is careful not to make any GOT | |
451 | references. When the tools don't permit us to avoid using a GOT entry | |
452 | for _dl_rtld_global (no attribute_hidden support), we must make sure | |
453 | this function is not inlined (see below). */ | |
454 | ||
455 | #ifdef DONT_USE_BOOTSTRAP_MAP | |
456 | static inline ElfW(Addr) __attribute__ ((always_inline)) | |
457 | _dl_start_final (void *arg) | |
458 | #else | |
459 | static ElfW(Addr) __attribute__ ((noinline)) | |
4874b009 | 460 | _dl_start_final (void *arg, struct dl_start_final_info *info) |
c2248c44 RM |
461 | #endif |
462 | { | |
463 | ElfW(Addr) start_addr; | |
c2248c44 | 464 | |
1e372ded AZ |
465 | /* If it hasn't happen yet record the startup time. */ |
466 | rtld_timer_start (&start_time); | |
467 | #if !defined DONT_USE_BOOTSTRAP_MAP | |
468 | RTLD_TIMING_SET (start_time, info->start_time); | |
4874b009 | 469 | #endif |
c2248c44 RM |
470 | |
471 | /* Transfer data about ourselves to the permanent link_map structure. */ | |
472 | #ifndef DONT_USE_BOOTSTRAP_MAP | |
4874b009 RM |
473 | GL(dl_rtld_map).l_addr = info->l.l_addr; |
474 | GL(dl_rtld_map).l_ld = info->l.l_ld; | |
b413280c | 475 | GL(dl_rtld_map).l_ld_readonly = info->l.l_ld_readonly; |
4874b009 | 476 | memcpy (GL(dl_rtld_map).l_info, info->l.l_info, |
c2248c44 | 477 | sizeof GL(dl_rtld_map).l_info); |
4874b009 | 478 | GL(dl_rtld_map).l_mach = info->l.l_mach; |
82221992 | 479 | GL(dl_rtld_map).l_relocated = 1; |
c2248c44 RM |
480 | #endif |
481 | _dl_setup_hash (&GL(dl_rtld_map)); | |
c0f62c56 | 482 | GL(dl_rtld_map).l_real = &GL(dl_rtld_map); |
c2248c44 RM |
483 | GL(dl_rtld_map).l_map_start = (ElfW(Addr)) _begin; |
484 | GL(dl_rtld_map).l_map_end = (ElfW(Addr)) _end; | |
eec8b6ca | 485 | GL(dl_rtld_map).l_text_end = (ElfW(Addr)) _etext; |
c2248c44 | 486 | /* Copy the TLS related data if necessary. */ |
11bf311e | 487 | #ifndef DONT_USE_BOOTSTRAP_MAP |
3d8c8bff | 488 | # if NO_TLS_OFFSET != 0 |
299601a1 | 489 | GL(dl_rtld_map).l_tls_offset = NO_TLS_OFFSET; |
c2248c44 | 490 | # endif |
c2248c44 RM |
491 | #endif |
492 | ||
ea4f25a7 UD |
493 | /* Initialize the stack end variable. */ |
494 | __libc_stack_end = __builtin_frame_address (0); | |
495 | ||
c2248c44 RM |
496 | /* Call the OS-dependent function to set up life so we can do things like |
497 | file access. It will call `dl_main' (below) to do all the real work | |
498 | of the dynamic linker, and then unwind our frame and run the user | |
499 | entry point on the same stack we entered on. */ | |
ecdeaac0 | 500 | start_addr = _dl_sysdep_start (arg, &dl_main); |
c2248c44 | 501 | |
a1ffb40e | 502 | if (__glibc_unlikely (GLRO(dl_debug_mask) & DL_DEBUG_STATISTICS)) |
39b04aa3 | 503 | { |
1e372ded AZ |
504 | RTLD_TIMING_VAR (rtld_total_time); |
505 | rtld_timer_stop (&rtld_total_time, start_time); | |
506 | print_statistics (RTLD_TIMING_REF(rtld_total_time)); | |
39b04aa3 | 507 | } |
c2248c44 RM |
508 | |
509 | return start_addr; | |
510 | } | |
511 | ||
01d8e36d UD |
512 | #ifdef DONT_USE_BOOTSTRAP_MAP |
513 | # define bootstrap_map GL(dl_rtld_map) | |
514 | #else | |
4874b009 | 515 | # define bootstrap_map info.l |
739d440d | 516 | #endif |
d66e34cd | 517 | |
490e6c62 FS |
518 | static ElfW(Addr) __attribute_used__ |
519 | _dl_start (void *arg) | |
520 | { | |
4874b009 | 521 | #ifdef DONT_USE_BOOTSTRAP_MAP |
1e372ded | 522 | rtld_timer_start (&start_time); |
4874b009 | 523 | #else |
490e6c62 | 524 | struct dl_start_final_info info; |
1e372ded | 525 | rtld_timer_start (&info.start_time); |
4874b009 | 526 | #endif |
db276fa1 | 527 | |
e66d0a4c UD |
528 | /* Partly clean the `bootstrap_map' structure up. Don't use |
529 | `memset' since it might not be built in or inlined and we cannot | |
530 | make function calls at this point. Use '__builtin_memset' if we | |
01d8e36d UD |
531 | know it is available. We do not have to clear the memory if we |
532 | do not have to use the temporary bootstrap_map. Global variables | |
533 | are initialized to zero by default. */ | |
534 | #ifndef DONT_USE_BOOTSTRAP_MAP | |
535 | # ifdef HAVE_BUILTIN_MEMSET | |
e66d0a4c | 536 | __builtin_memset (bootstrap_map.l_info, '\0', sizeof (bootstrap_map.l_info)); |
01d8e36d | 537 | # else |
ce460d04 | 538 | for (size_t cnt = 0; |
264ec183 UD |
539 | cnt < sizeof (bootstrap_map.l_info) / sizeof (bootstrap_map.l_info[0]); |
540 | ++cnt) | |
541 | bootstrap_map.l_info[cnt] = 0; | |
01d8e36d | 542 | # endif |
e66d0a4c | 543 | #endif |
264ec183 | 544 | |
d66e34cd | 545 | /* Figure out the run-time load address of the dynamic linker itself. */ |
86d2c878 | 546 | bootstrap_map.l_addr = elf_machine_load_address (); |
d66e34cd | 547 | |
47707456 UD |
548 | /* Read our own dynamic section and fill in the info array. */ |
549 | bootstrap_map.l_ld = (void *) bootstrap_map.l_addr + elf_machine_dynamic (); | |
2ec99d8c | 550 | bootstrap_map.l_ld_readonly = DL_RO_DYN_SECTION; |
5118dcac | 551 | elf_get_dynamic_info (&bootstrap_map, true, false); |
d66e34cd | 552 | |
11bf311e | 553 | #if NO_TLS_OFFSET != 0 |
299601a1 UD |
554 | bootstrap_map.l_tls_offset = NO_TLS_OFFSET; |
555 | #endif | |
556 | ||
d66e34cd | 557 | #ifdef ELF_MACHINE_BEFORE_RTLD_RELOC |
490e6c62 | 558 | ELF_MACHINE_BEFORE_RTLD_RELOC (&bootstrap_map, bootstrap_map.l_info); |
d66e34cd RM |
559 | #endif |
560 | ||
32e6df36 UD |
561 | if (bootstrap_map.l_addr || ! bootstrap_map.l_info[VALIDX(DT_GNU_PRELINKED)]) |
562 | { | |
563 | /* Relocate ourselves so we can do normal function calls and | |
564 | data access using the global offset table. */ | |
565 | ||
490e6c62 | 566 | ELF_DYNAMIC_RELOCATE (&bootstrap_map, NULL, 0, 0, 0); |
32e6df36 | 567 | } |
f85f3563 | 568 | bootstrap_map.l_relocated = 1; |
421f82e5 | 569 | |
ea7eb7e3 UD |
570 | /* Please note that we don't allow profiling of this object and |
571 | therefore need not test whether we have to allocate the array | |
572 | for the relocation results (as done in dl-reloc.c). */ | |
421f82e5 | 573 | |
d66e34cd RM |
574 | /* Now life is sane; we can call functions and access global data. |
575 | Set up to use the operating system facilities, and find out from | |
576 | the operating system's program loader where to find the program | |
6a1db4ff UD |
577 | header table in core. Put the rest of _dl_start into a separate |
578 | function, that way the compiler cannot put accesses to the GOT | |
579 | before ELF_DYNAMIC_RELOCATE. */ | |
3a0ecccb FW |
580 | |
581 | __rtld_malloc_init_stubs (); | |
582 | ||
c0282c06 | 583 | { |
01d8e36d UD |
584 | #ifdef DONT_USE_BOOTSTRAP_MAP |
585 | ElfW(Addr) entry = _dl_start_final (arg); | |
586 | #else | |
4874b009 | 587 | ElfW(Addr) entry = _dl_start_final (arg, &info); |
01d8e36d | 588 | #endif |
c0282c06 UD |
589 | |
590 | #ifndef ELF_MACHINE_START_ADDRESS | |
591 | # define ELF_MACHINE_START_ADDRESS(map, start) (start) | |
592 | #endif | |
593 | ||
7cb92a99 | 594 | return ELF_MACHINE_START_ADDRESS (GL(dl_ns)[LM_ID_BASE]._ns_loaded, entry); |
c0282c06 | 595 | } |
6a1db4ff UD |
596 | } |
597 | ||
598 | ||
d66e34cd | 599 | |
d66e34cd RM |
600 | /* Now life is peachy; we can do all normal operations. |
601 | On to the real work. */ | |
602 | ||
993b3242 UD |
603 | /* Some helper functions. */ |
604 | ||
605 | /* Arguments to relocate_doit. */ | |
606 | struct relocate_args | |
607 | { | |
608 | struct link_map *l; | |
2ca285b0 | 609 | int reloc_mode; |
993b3242 UD |
610 | }; |
611 | ||
612 | struct map_args | |
613 | { | |
614 | /* Argument to map_doit. */ | |
acf869f4 | 615 | const char *str; |
f04b9a68 | 616 | struct link_map *loader; |
f04b9a68 | 617 | int mode; |
993b3242 | 618 | /* Return value of map_doit. */ |
f04b9a68 | 619 | struct link_map *map; |
993b3242 UD |
620 | }; |
621 | ||
9dcafc55 UD |
622 | struct dlmopen_args |
623 | { | |
624 | const char *fname; | |
625 | struct link_map *map; | |
626 | }; | |
627 | ||
628 | struct lookup_args | |
629 | { | |
630 | const char *name; | |
631 | struct link_map *map; | |
632 | void *result; | |
633 | }; | |
634 | ||
993b3242 UD |
635 | /* Arguments to version_check_doit. */ |
636 | struct version_check_args | |
637 | { | |
993b3242 | 638 | int doexit; |
145b8413 | 639 | int dotrace; |
993b3242 UD |
640 | }; |
641 | ||
642 | static void | |
643 | relocate_doit (void *a) | |
644 | { | |
645 | struct relocate_args *args = (struct relocate_args *) a; | |
646 | ||
2ca285b0 | 647 | _dl_relocate_object (args->l, args->l->l_scope, args->reloc_mode, 0); |
993b3242 UD |
648 | } |
649 | ||
650 | static void | |
651 | map_doit (void *a) | |
652 | { | |
be935610 | 653 | struct map_args *args = (struct map_args *) a; |
798212a0 PP |
654 | int type = (args->mode == __RTLD_OPENEXEC) ? lt_executable : lt_library; |
655 | args->map = _dl_map_object (args->loader, args->str, type, 0, | |
8e9f92e9 | 656 | args->mode, LM_ID_BASE); |
993b3242 UD |
657 | } |
658 | ||
9dcafc55 UD |
659 | static void |
660 | dlmopen_doit (void *a) | |
661 | { | |
662 | struct dlmopen_args *args = (struct dlmopen_args *) a; | |
8e9f92e9 AS |
663 | args->map = _dl_open (args->fname, |
664 | (RTLD_LAZY | __RTLD_DLOPEN | __RTLD_AUDIT | |
665 | | __RTLD_SECURE), | |
4243cbea | 666 | dl_main, LM_ID_NEWLM, _dl_argc, _dl_argv, |
9dcafc55 UD |
667 | __environ); |
668 | } | |
669 | ||
670 | static void | |
671 | lookup_doit (void *a) | |
672 | { | |
673 | struct lookup_args *args = (struct lookup_args *) a; | |
674 | const ElfW(Sym) *ref = NULL; | |
675 | args->result = NULL; | |
676 | lookup_t l = _dl_lookup_symbol_x (args->name, args->map, &ref, | |
677 | args->map->l_local_scope, NULL, 0, | |
678 | DL_LOOKUP_RETURN_NEWEST, NULL); | |
679 | if (ref != NULL) | |
680 | args->result = DL_SYMBOL_ADDRESS (l, ref); | |
681 | } | |
682 | ||
993b3242 UD |
683 | static void |
684 | version_check_doit (void *a) | |
685 | { | |
be935610 | 686 | struct version_check_args *args = (struct version_check_args *) a; |
c0f62c56 UD |
687 | if (_dl_check_all_versions (GL(dl_ns)[LM_ID_BASE]._ns_loaded, 1, |
688 | args->dotrace) && args->doexit) | |
993b3242 UD |
689 | /* We cannot start the application. Abort now. */ |
690 | _exit (1); | |
691 | } | |
692 | ||
ce37fa88 UD |
693 | |
694 | static inline struct link_map * | |
695 | find_needed (const char *name) | |
696 | { | |
c0f62c56 UD |
697 | struct r_scope_elem *scope = &GL(dl_ns)[LM_ID_BASE]._ns_loaded->l_searchlist; |
698 | unsigned int n = scope->r_nlist; | |
ce37fa88 | 699 | |
be935610 | 700 | while (n-- > 0) |
c0f62c56 UD |
701 | if (_dl_name_match_p (name, scope->r_list[n])) |
702 | return scope->r_list[n]; | |
ce37fa88 UD |
703 | |
704 | /* Should never happen. */ | |
705 | return NULL; | |
706 | } | |
707 | ||
708 | static int | |
709 | match_version (const char *string, struct link_map *map) | |
710 | { | |
a42195db | 711 | const char *strtab = (const void *) D_PTR (map, l_info[DT_STRTAB]); |
ce37fa88 UD |
712 | ElfW(Verdef) *def; |
713 | ||
b0982c4a | 714 | #define VERDEFTAG (DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGIDX (DT_VERDEF)) |
ce37fa88 UD |
715 | if (map->l_info[VERDEFTAG] == NULL) |
716 | /* The file has no symbol versioning. */ | |
717 | return 0; | |
718 | ||
719 | def = (ElfW(Verdef) *) ((char *) map->l_addr | |
720 | + map->l_info[VERDEFTAG]->d_un.d_ptr); | |
721 | while (1) | |
722 | { | |
723 | ElfW(Verdaux) *aux = (ElfW(Verdaux) *) ((char *) def + def->vd_aux); | |
724 | ||
725 | /* Compare the version strings. */ | |
726 | if (strcmp (string, strtab + aux->vda_name) == 0) | |
727 | /* Bingo! */ | |
728 | return 1; | |
729 | ||
730 | /* If no more definitions we failed to find what we want. */ | |
731 | if (def->vd_next == 0) | |
732 | break; | |
733 | ||
734 | /* Next definition. */ | |
735 | def = (ElfW(Verdef) *) ((char *) def + def->vd_next); | |
736 | } | |
737 | ||
738 | return 0; | |
739 | } | |
740 | ||
9dcafc55 UD |
741 | static bool tls_init_tp_called; |
742 | ||
743 | static void * | |
17796419 | 744 | init_tls (size_t naudit) |
9dcafc55 UD |
745 | { |
746 | /* Number of elements in the static TLS block. */ | |
747 | GL(dl_tls_static_nelem) = GL(dl_tls_max_dtv_idx); | |
748 | ||
749 | /* Do not do this twice. The audit interface might have required | |
750 | the DTV interfaces to be set up early. */ | |
751 | if (GL(dl_initial_dtv) != NULL) | |
752 | return NULL; | |
753 | ||
754 | /* Allocate the array which contains the information about the | |
755 | dtv slots. We allocate a few entries more than needed to | |
756 | avoid the need for reallocation. */ | |
757 | size_t nelem = GL(dl_tls_max_dtv_idx) + 1 + TLS_SLOTINFO_SURPLUS; | |
758 | ||
759 | /* Allocate. */ | |
760 | GL(dl_tls_dtv_slotinfo_list) = (struct dtv_slotinfo_list *) | |
761 | calloc (sizeof (struct dtv_slotinfo_list) | |
762 | + nelem * sizeof (struct dtv_slotinfo), 1); | |
763 | /* No need to check the return value. If memory allocation failed | |
764 | the program would have been terminated. */ | |
765 | ||
766 | struct dtv_slotinfo *slotinfo = GL(dl_tls_dtv_slotinfo_list)->slotinfo; | |
767 | GL(dl_tls_dtv_slotinfo_list)->len = nelem; | |
768 | GL(dl_tls_dtv_slotinfo_list)->next = NULL; | |
769 | ||
770 | /* Fill in the information from the loaded modules. No namespace | |
771 | but the base one can be filled at this time. */ | |
772 | assert (GL(dl_ns)[LM_ID_BASE + 1]._ns_loaded == NULL); | |
773 | int i = 0; | |
774 | for (struct link_map *l = GL(dl_ns)[LM_ID_BASE]._ns_loaded; l != NULL; | |
775 | l = l->l_next) | |
776 | if (l->l_tls_blocksize != 0) | |
777 | { | |
778 | /* This is a module with TLS data. Store the map reference. | |
779 | The generation counter is zero. */ | |
780 | slotinfo[i].map = l; | |
781 | /* slotinfo[i].gen = 0; */ | |
782 | ++i; | |
783 | } | |
784 | assert (i == GL(dl_tls_max_dtv_idx)); | |
785 | ||
0c7b002f | 786 | /* Calculate the size of the static TLS surplus. */ |
17796419 | 787 | _dl_tls_static_surplus_init (naudit); |
0c7b002f | 788 | |
9dcafc55 UD |
789 | /* Compute the TLS offsets for the various blocks. */ |
790 | _dl_determine_tlsoffset (); | |
791 | ||
792 | /* Construct the static TLS block and the dtv for the initial | |
793 | thread. For some platforms this will include allocating memory | |
794 | for the thread descriptor. The memory for the TLS block will | |
795 | never be freed. It should be allocated accordingly. The dtv | |
796 | array can be changed if dynamic loading requires it. */ | |
797 | void *tcbp = _dl_allocate_tls_storage (); | |
798 | if (tcbp == NULL) | |
799 | _dl_fatal_printf ("\ | |
f648728c | 800 | cannot allocate TLS data structures for initial thread\n"); |
9dcafc55 UD |
801 | |
802 | /* Store for detection of the special case by __tls_get_addr | |
803 | so it knows not to pass this dtv to the normal realloc. */ | |
804 | GL(dl_initial_dtv) = GET_DTV (tcbp); | |
805 | ||
3d8c8bff | 806 | /* And finally install it for the main thread. */ |
774f9285 | 807 | const char *lossage = TLS_INIT_TP (tcbp); |
a1ffb40e | 808 | if (__glibc_unlikely (lossage != NULL)) |
9dcafc55 | 809 | _dl_fatal_printf ("cannot set up thread-local storage: %s\n", lossage); |
90d7e7e5 | 810 | __tls_init_tp (); |
9dcafc55 UD |
811 | tls_init_tp_called = true; |
812 | ||
813 | return tcbp; | |
814 | } | |
9dcafc55 | 815 | |
20fe49b9 | 816 | static unsigned int |
acf869f4 | 817 | do_preload (const char *fname, struct link_map *main_map, const char *where) |
20fe49b9 UD |
818 | { |
819 | const char *objname; | |
820 | const char *err_str = NULL; | |
821 | struct map_args args; | |
74780cf6 | 822 | bool malloced; |
20fe49b9 UD |
823 | |
824 | args.str = fname; | |
825 | args.loader = main_map; | |
8e9f92e9 | 826 | args.mode = __RTLD_SECURE; |
20fe49b9 UD |
827 | |
828 | unsigned int old_nloaded = GL(dl_ns)[LM_ID_BASE]._ns_nloaded; | |
829 | ||
74780cf6 | 830 | (void) _dl_catch_error (&objname, &err_str, &malloced, map_doit, &args); |
a1ffb40e | 831 | if (__glibc_unlikely (err_str != NULL)) |
20fe49b9 UD |
832 | { |
833 | _dl_error_printf ("\ | |
4db5b08f MS |
834 | ERROR: ld.so: object '%s' from %s cannot be preloaded (%s): ignored.\n", |
835 | fname, where, err_str); | |
20fe49b9 UD |
836 | /* No need to call free, this is still before |
837 | the libc's malloc is used. */ | |
838 | } | |
839 | else if (GL(dl_ns)[LM_ID_BASE]._ns_nloaded != old_nloaded) | |
840 | /* It is no duplicate. */ | |
841 | return 1; | |
842 | ||
843 | /* Nothing loaded. */ | |
844 | return 0; | |
845 | } | |
846 | ||
4c48ef06 UD |
847 | static void |
848 | security_init (void) | |
849 | { | |
850 | /* Set up the stack checker's canary. */ | |
965cb60a | 851 | uintptr_t stack_chk_guard = _dl_setup_stack_chk_guard (_dl_random); |
4c48ef06 UD |
852 | #ifdef THREAD_SET_STACK_GUARD |
853 | THREAD_SET_STACK_GUARD (stack_chk_guard); | |
854 | #else | |
855 | __stack_chk_guard = stack_chk_guard; | |
856 | #endif | |
857 | ||
858 | /* Set up the pointer guard as well, if necessary. */ | |
a014cecd FW |
859 | uintptr_t pointer_chk_guard |
860 | = _dl_setup_pointer_guard (_dl_random, stack_chk_guard); | |
4c48ef06 | 861 | #ifdef THREAD_SET_POINTER_GUARD |
a014cecd | 862 | THREAD_SET_POINTER_GUARD (pointer_chk_guard); |
4c48ef06 | 863 | #endif |
a014cecd | 864 | __pointer_chk_guard_local = pointer_chk_guard; |
965cb60a UD |
865 | |
866 | /* We do not need the _dl_random value anymore. The less | |
867 | information we leave behind, the better, so clear the | |
868 | variable. */ | |
869 | _dl_random = NULL; | |
4c48ef06 UD |
870 | } |
871 | ||
1bdda52f | 872 | #include <setup-vdso.h> |
4c48ef06 | 873 | |
6d0ba622 FW |
874 | /* The LD_PRELOAD environment variable gives list of libraries |
875 | separated by white space or colons that are loaded before the | |
876 | executable's dependencies and prepended to the global scope list. | |
877 | (If the binary is running setuid all elements containing a '/' are | |
878 | ignored since it is insecure.) Return the number of preloads | |
8692ebdb | 879 | performed. Ditto for --preload command argument. */ |
6d0ba622 | 880 | unsigned int |
8692ebdb DN |
881 | handle_preload_list (const char *preloadlist, struct link_map *main_map, |
882 | const char *where) | |
6d0ba622 FW |
883 | { |
884 | unsigned int npreloads = 0; | |
885 | const char *p = preloadlist; | |
886 | char fname[SECURE_PATH_LIMIT]; | |
887 | ||
888 | while (*p != '\0') | |
889 | { | |
890 | /* Split preload list at space/colon. */ | |
891 | size_t len = strcspn (p, " :"); | |
892 | if (len > 0 && len < sizeof (fname)) | |
893 | { | |
894 | memcpy (fname, p, len); | |
895 | fname[len] = '\0'; | |
896 | } | |
897 | else | |
898 | fname[0] = '\0'; | |
899 | ||
900 | /* Skip over the substring and the following delimiter. */ | |
901 | p += len; | |
902 | if (*p != '\0') | |
903 | ++p; | |
904 | ||
905 | if (dso_name_valid_for_suid (fname)) | |
8692ebdb | 906 | npreloads += do_preload (fname, main_map, where); |
6d0ba622 FW |
907 | } |
908 | return npreloads; | |
909 | } | |
910 | ||
3b856d09 FW |
911 | /* Called if the audit DSO cannot be used: if it does not have the |
912 | appropriate interfaces, or it expects a more recent version library | |
913 | version than what the dynamic linker provides. */ | |
914 | static void | |
915 | unload_audit_module (struct link_map *map, int original_tls_idx) | |
916 | { | |
917 | #ifndef NDEBUG | |
918 | Lmid_t ns = map->l_ns; | |
919 | #endif | |
920 | _dl_close (map); | |
921 | ||
922 | /* Make sure the namespace has been cleared entirely. */ | |
923 | assert (GL(dl_ns)[ns]._ns_loaded == NULL); | |
924 | assert (GL(dl_ns)[ns]._ns_nloaded == 0); | |
925 | ||
926 | GL(dl_tls_max_dtv_idx) = original_tls_idx; | |
927 | } | |
928 | ||
929 | /* Called to print an error message if loading of an audit module | |
930 | failed. */ | |
931 | static void | |
932 | report_audit_module_load_error (const char *name, const char *err_str, | |
933 | bool malloced) | |
934 | { | |
935 | _dl_error_printf ("\ | |
936 | ERROR: ld.so: object '%s' cannot be loaded as audit interface: %s; ignored.\n", | |
937 | name, err_str); | |
938 | if (malloced) | |
939 | free ((char *) err_str); | |
940 | } | |
941 | ||
942 | /* Load one audit module. */ | |
943 | static void | |
944 | load_audit_module (const char *name, struct audit_ifaces **last_audit) | |
945 | { | |
946 | int original_tls_idx = GL(dl_tls_max_dtv_idx); | |
947 | ||
948 | struct dlmopen_args dlmargs; | |
949 | dlmargs.fname = name; | |
950 | dlmargs.map = NULL; | |
951 | ||
952 | const char *objname; | |
953 | const char *err_str = NULL; | |
954 | bool malloced; | |
955 | _dl_catch_error (&objname, &err_str, &malloced, dlmopen_doit, &dlmargs); | |
956 | if (__glibc_unlikely (err_str != NULL)) | |
957 | { | |
958 | report_audit_module_load_error (name, err_str, malloced); | |
959 | return; | |
960 | } | |
961 | ||
962 | struct lookup_args largs; | |
963 | largs.name = "la_version"; | |
964 | largs.map = dlmargs.map; | |
965 | _dl_catch_error (&objname, &err_str, &malloced, lookup_doit, &largs); | |
966 | if (__glibc_likely (err_str != NULL)) | |
967 | { | |
968 | unload_audit_module (dlmargs.map, original_tls_idx); | |
969 | report_audit_module_load_error (name, err_str, malloced); | |
970 | return; | |
971 | } | |
972 | ||
973 | unsigned int (*laversion) (unsigned int) = largs.result; | |
974 | ||
975 | /* A null symbol indicates that something is very wrong with the | |
976 | loaded object because defined symbols are supposed to have a | |
977 | valid, non-null address. */ | |
978 | assert (laversion != NULL); | |
979 | ||
980 | unsigned int lav = laversion (LAV_CURRENT); | |
981 | if (lav == 0) | |
982 | { | |
983 | /* Only print an error message if debugging because this can | |
984 | happen deliberately. */ | |
985 | if (GLRO(dl_debug_mask) & DL_DEBUG_FILES) | |
986 | _dl_debug_printf ("\ | |
987 | file=%s [%lu]; audit interface function la_version returned zero; ignored.\n", | |
988 | dlmargs.map->l_name, dlmargs.map->l_ns); | |
989 | unload_audit_module (dlmargs.map, original_tls_idx); | |
990 | return; | |
991 | } | |
992 | ||
993 | if (lav > LAV_CURRENT) | |
994 | { | |
995 | _dl_debug_printf ("\ | |
996 | ERROR: audit interface '%s' requires version %d (maximum supported version %d); ignored.\n", | |
997 | name, lav, LAV_CURRENT); | |
998 | unload_audit_module (dlmargs.map, original_tls_idx); | |
999 | return; | |
1000 | } | |
1001 | ||
1002 | enum { naudit_ifaces = 8 }; | |
1003 | union | |
1004 | { | |
1005 | struct audit_ifaces ifaces; | |
1006 | void (*fptr[naudit_ifaces]) (void); | |
1007 | } *newp = malloc (sizeof (*newp)); | |
1008 | if (newp == NULL) | |
1009 | _dl_fatal_printf ("Out of memory while loading audit modules\n"); | |
1010 | ||
1011 | /* Names of the auditing interfaces. All in one | |
1012 | long string. */ | |
1013 | static const char audit_iface_names[] = | |
1014 | "la_activity\0" | |
1015 | "la_objsearch\0" | |
1016 | "la_objopen\0" | |
1017 | "la_preinit\0" | |
1018 | #if __ELF_NATIVE_CLASS == 32 | |
1019 | "la_symbind32\0" | |
1020 | #elif __ELF_NATIVE_CLASS == 64 | |
1021 | "la_symbind64\0" | |
1022 | #else | |
1023 | # error "__ELF_NATIVE_CLASS must be defined" | |
1024 | #endif | |
1025 | #define STRING(s) __STRING (s) | |
1026 | "la_" STRING (ARCH_LA_PLTENTER) "\0" | |
1027 | "la_" STRING (ARCH_LA_PLTEXIT) "\0" | |
1028 | "la_objclose\0"; | |
1029 | unsigned int cnt = 0; | |
1030 | const char *cp = audit_iface_names; | |
1031 | do | |
1032 | { | |
1033 | largs.name = cp; | |
1034 | _dl_catch_error (&objname, &err_str, &malloced, lookup_doit, &largs); | |
1035 | ||
1036 | /* Store the pointer. */ | |
1037 | if (err_str == NULL && largs.result != NULL) | |
c7bf5cea | 1038 | newp->fptr[cnt] = largs.result; |
3b856d09 FW |
1039 | else |
1040 | newp->fptr[cnt] = NULL; | |
1041 | ++cnt; | |
1042 | ||
1043 | cp = rawmemchr (cp, '\0') + 1; | |
1044 | } | |
1045 | while (*cp != '\0'); | |
1046 | assert (cnt == naudit_ifaces); | |
1047 | ||
1048 | /* Now append the new auditing interface to the list. */ | |
1049 | newp->ifaces.next = NULL; | |
1050 | if (*last_audit == NULL) | |
1051 | *last_audit = GLRO(dl_audit) = &newp->ifaces; | |
1052 | else | |
1053 | *last_audit = (*last_audit)->next = &newp->ifaces; | |
c7bf5cea | 1054 | |
e1d559f3 FW |
1055 | /* The dynamic linker link map is statically allocated, so the |
1056 | cookie in _dl_new_object has not happened. */ | |
1057 | link_map_audit_state (&GL (dl_rtld_map), GLRO (dl_naudit))->cookie | |
c7bf5cea FW |
1058 | = (intptr_t) &GL (dl_rtld_map); |
1059 | ||
3b856d09 FW |
1060 | ++GLRO(dl_naudit); |
1061 | ||
1062 | /* Mark the DSO as being used for auditing. */ | |
1063 | dlmargs.map->l_auditing = 1; | |
1064 | } | |
1065 | ||
1066 | /* Notify the the audit modules that the object MAP has already been | |
1067 | loaded. */ | |
1068 | static void | |
1069 | notify_audit_modules_of_loaded_object (struct link_map *map) | |
1070 | { | |
1071 | struct audit_ifaces *afct = GLRO(dl_audit); | |
1072 | for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt) | |
1073 | { | |
1074 | if (afct->objopen != NULL) | |
1075 | { | |
e1d559f3 FW |
1076 | struct auditstate *state = link_map_audit_state (map, cnt); |
1077 | state->bindflags = afct->objopen (map, LM_ID_BASE, &state->cookie); | |
1078 | map->l_audit_any_plt |= state->bindflags != 0; | |
3b856d09 FW |
1079 | } |
1080 | ||
1081 | afct = afct->next; | |
1082 | } | |
1083 | } | |
1084 | ||
1085 | /* Load all audit modules. */ | |
1086 | static void | |
4c6e0415 | 1087 | load_audit_modules (struct link_map *main_map, struct audit_list *audit_list) |
3b856d09 FW |
1088 | { |
1089 | struct audit_ifaces *last_audit = NULL; | |
3b856d09 FW |
1090 | |
1091 | while (true) | |
1092 | { | |
4c6e0415 | 1093 | const char *name = audit_list_next (audit_list); |
3b856d09 FW |
1094 | if (name == NULL) |
1095 | break; | |
1096 | load_audit_module (name, &last_audit); | |
1097 | } | |
1098 | ||
1099 | /* Notify audit modules of the initially loaded modules (the main | |
1100 | program and the dynamic linker itself). */ | |
1101 | if (GLRO(dl_naudit) > 0) | |
1102 | { | |
1103 | notify_audit_modules_of_loaded_object (main_map); | |
1104 | notify_audit_modules_of_loaded_object (&GL(dl_rtld_map)); | |
1105 | } | |
1106 | } | |
1107 | ||
d66e34cd | 1108 | static void |
266180eb | 1109 | dl_main (const ElfW(Phdr) *phdr, |
72f70279 | 1110 | ElfW(Word) phnum, |
3a56ea26 AK |
1111 | ElfW(Addr) *user_entry, |
1112 | ElfW(auxv_t) *auxv) | |
d66e34cd | 1113 | { |
266180eb | 1114 | const ElfW(Phdr) *ph; |
c0f62c56 | 1115 | struct link_map *main_map; |
14bab8de UD |
1116 | size_t file_size; |
1117 | char *file; | |
164a7164 | 1118 | bool has_interp = false; |
77aba05b | 1119 | unsigned int i; |
164a7164 UD |
1120 | bool prelinked = false; |
1121 | bool rtld_is_main = false; | |
9dcafc55 | 1122 | void *tcbp = NULL; |
d66e34cd | 1123 | |
2bf9e641 FW |
1124 | struct dl_main_state state; |
1125 | dl_main_state_init (&state); | |
4c6e0415 | 1126 | |
d017b0ab | 1127 | __tls_pre_init_tp (); |
334fcf2a | 1128 | |
2dd87703 | 1129 | #if !PTHREAD_IN_LIBC |
c70ba488 RM |
1130 | /* The explicit initialization here is cheaper than processing the reloc |
1131 | in the _rtld_local definition's initializer. */ | |
1132 | GL(dl_make_stack_executable_hook) = &_dl_make_stack_executable; | |
2dd87703 | 1133 | #endif |
c70ba488 | 1134 | |
ea278354 | 1135 | /* Process the environment variable which control the behaviour. */ |
2bf9e641 | 1136 | process_envvars (&state); |
3996f34b | 1137 | |
ce6e047f | 1138 | #ifndef HAVE_INLINED_SYSCALLS |
46ec036d | 1139 | /* Set up a flag which tells we are just starting. */ |
9cf27b8d | 1140 | _dl_starting_up = 1; |
ce6e047f | 1141 | #endif |
46ec036d | 1142 | |
e0f1a58f | 1143 | const char *ld_so_name = _dl_argv[0]; |
a16956f3 | 1144 | if (*user_entry == (ElfW(Addr)) ENTRY_POINT) |
0200214b RM |
1145 | { |
1146 | /* Ho ho. We are not the program interpreter! We are the program | |
1147 | itself! This means someone ran ld.so as a command. Well, that | |
1148 | might be convenient to do sometimes. We support it by | |
1149 | interpreting the args like this: | |
1150 | ||
1151 | ld.so PROGRAM ARGS... | |
1152 | ||
1153 | The first argument is the name of a file containing an ELF | |
1154 | executable we will load and run with the following arguments. | |
1155 | To simplify life here, PROGRAM is searched for using the | |
1156 | normal rules for shared objects, rather than $PATH or anything | |
1157 | like that. We just load it and use its entry point; we don't | |
1158 | pay attention to its PT_INTERP command (we are the interpreter | |
1159 | ourselves). This is an easy way to test a new ld.so before | |
1160 | installing it. */ | |
164a7164 | 1161 | rtld_is_main = true; |
421f82e5 | 1162 | |
c6702789 VM |
1163 | char *argv0 = NULL; |
1164 | ||
ffee1316 | 1165 | /* Note the place where the dynamic linker actually came from. */ |
e6caf4e1 | 1166 | GL(dl_rtld_map).l_name = rtld_progname; |
6a76c115 | 1167 | |
fd26970f | 1168 | while (_dl_argc > 1) |
4243cbea | 1169 | if (! strcmp (_dl_argv[1], "--list")) |
fd26970f | 1170 | { |
e0f1a58f FW |
1171 | if (state.mode != rtld_mode_help) |
1172 | { | |
1173 | state.mode = rtld_mode_list; | |
1174 | /* This means do no dependency analysis. */ | |
1175 | GLRO(dl_lazy) = -1; | |
1176 | } | |
61965e9b | 1177 | |
fd26970f UD |
1178 | ++_dl_skip_args; |
1179 | --_dl_argc; | |
4243cbea | 1180 | ++_dl_argv; |
fd26970f | 1181 | } |
4243cbea | 1182 | else if (! strcmp (_dl_argv[1], "--verify")) |
fd26970f | 1183 | { |
e0f1a58f FW |
1184 | if (state.mode != rtld_mode_help) |
1185 | state.mode = rtld_mode_verify; | |
6a76c115 | 1186 | |
73d65cc3 SP |
1187 | ++_dl_skip_args; |
1188 | --_dl_argc; | |
4243cbea | 1189 | ++_dl_argv; |
73d65cc3 | 1190 | } |
4243cbea | 1191 | else if (! strcmp (_dl_argv[1], "--inhibit-cache")) |
73d65cc3 SP |
1192 | { |
1193 | GLRO(dl_inhibit_cache) = 1; | |
fd26970f UD |
1194 | ++_dl_skip_args; |
1195 | --_dl_argc; | |
4243cbea | 1196 | ++_dl_argv; |
fd26970f | 1197 | } |
4243cbea | 1198 | else if (! strcmp (_dl_argv[1], "--library-path") |
e6caf4e1 | 1199 | && _dl_argc > 2) |
880f421f | 1200 | { |
2bf9e641 | 1201 | state.library_path = _dl_argv[2]; |
27316f4a | 1202 | state.library_path_source = "--library-path"; |
880f421f | 1203 | |
310930c1 UD |
1204 | _dl_skip_args += 2; |
1205 | _dl_argc -= 2; | |
4243cbea | 1206 | _dl_argv += 2; |
310930c1 | 1207 | } |
4243cbea | 1208 | else if (! strcmp (_dl_argv[1], "--inhibit-rpath") |
e6caf4e1 | 1209 | && _dl_argc > 2) |
310930c1 | 1210 | { |
4243cbea | 1211 | GLRO(dl_inhibit_rpath) = _dl_argv[2]; |
310930c1 | 1212 | |
74780cf6 UD |
1213 | _dl_skip_args += 2; |
1214 | _dl_argc -= 2; | |
4243cbea | 1215 | _dl_argv += 2; |
74780cf6 | 1216 | } |
4243cbea | 1217 | else if (! strcmp (_dl_argv[1], "--audit") && _dl_argc > 2) |
74780cf6 | 1218 | { |
2bf9e641 | 1219 | audit_list_add_string (&state.audit_list, _dl_argv[2]); |
74780cf6 | 1220 | |
8692ebdb DN |
1221 | _dl_skip_args += 2; |
1222 | _dl_argc -= 2; | |
1223 | _dl_argv += 2; | |
1224 | } | |
1225 | else if (! strcmp (_dl_argv[1], "--preload") && _dl_argc > 2) | |
1226 | { | |
2bf9e641 | 1227 | state.preloadarg = _dl_argv[2]; |
c6702789 VM |
1228 | _dl_skip_args += 2; |
1229 | _dl_argc -= 2; | |
1230 | _dl_argv += 2; | |
1231 | } | |
1232 | else if (! strcmp (_dl_argv[1], "--argv0") && _dl_argc > 2) | |
1233 | { | |
1234 | argv0 = _dl_argv[2]; | |
1235 | ||
dad90d52 FW |
1236 | _dl_skip_args += 2; |
1237 | _dl_argc -= 2; | |
1238 | _dl_argv += 2; | |
1239 | } | |
1240 | else if (strcmp (_dl_argv[1], "--glibc-hwcaps-prepend") == 0 | |
1241 | && _dl_argc > 2) | |
1242 | { | |
1243 | state.glibc_hwcaps_prepend = _dl_argv[2]; | |
1244 | _dl_skip_args += 2; | |
1245 | _dl_argc -= 2; | |
1246 | _dl_argv += 2; | |
1247 | } | |
1248 | else if (strcmp (_dl_argv[1], "--glibc-hwcaps-mask") == 0 | |
1249 | && _dl_argc > 2) | |
1250 | { | |
1251 | state.glibc_hwcaps_mask = _dl_argv[2]; | |
880f421f UD |
1252 | _dl_skip_args += 2; |
1253 | _dl_argc -= 2; | |
4243cbea | 1254 | _dl_argv += 2; |
880f421f | 1255 | } |
86f65dff L |
1256 | #if HAVE_TUNABLES |
1257 | else if (! strcmp (_dl_argv[1], "--list-tunables")) | |
1258 | { | |
1259 | state.mode = rtld_mode_list_tunables; | |
1260 | ||
1261 | ++_dl_skip_args; | |
1262 | --_dl_argc; | |
1263 | ++_dl_argv; | |
1264 | } | |
1265 | #endif | |
851f32cf FW |
1266 | else if (! strcmp (_dl_argv[1], "--list-diagnostics")) |
1267 | { | |
1268 | state.mode = rtld_mode_list_diagnostics; | |
1269 | ||
1270 | ++_dl_skip_args; | |
1271 | --_dl_argc; | |
1272 | ++_dl_argv; | |
1273 | } | |
e0f1a58f FW |
1274 | else if (strcmp (_dl_argv[1], "--help") == 0) |
1275 | { | |
1276 | state.mode = rtld_mode_help; | |
1277 | --_dl_argc; | |
1278 | ++_dl_argv; | |
1279 | } | |
542923d9 FW |
1280 | else if (strcmp (_dl_argv[1], "--version") == 0) |
1281 | _dl_version (); | |
e0f1a58f FW |
1282 | else if (_dl_argv[1][0] == '-' && _dl_argv[1][1] == '-') |
1283 | { | |
1284 | if (_dl_argv[1][1] == '\0') | |
1285 | /* End of option list. */ | |
1286 | break; | |
1287 | else | |
1288 | /* Unrecognized option. */ | |
1289 | _dl_usage (ld_so_name, _dl_argv[1]); | |
1290 | } | |
fd26970f UD |
1291 | else |
1292 | break; | |
d66e34cd | 1293 | |
86f65dff L |
1294 | #if HAVE_TUNABLES |
1295 | if (__glibc_unlikely (state.mode == rtld_mode_list_tunables)) | |
1296 | { | |
1297 | __tunables_print (); | |
1298 | _exit (0); | |
1299 | } | |
1300 | #endif | |
1301 | ||
851f32cf FW |
1302 | if (state.mode == rtld_mode_list_diagnostics) |
1303 | _dl_print_diagnostics (_environ); | |
1304 | ||
61eb22d3 UD |
1305 | /* If we have no further argument the program was called incorrectly. |
1306 | Grant the user some education. */ | |
1307 | if (_dl_argc < 2) | |
e0f1a58f FW |
1308 | { |
1309 | if (state.mode == rtld_mode_help) | |
1310 | /* --help without an executable is not an error. */ | |
1311 | _dl_help (ld_so_name, &state); | |
1312 | else | |
1313 | _dl_usage (ld_so_name, NULL); | |
1314 | } | |
61eb22d3 | 1315 | |
0200214b RM |
1316 | ++_dl_skip_args; |
1317 | --_dl_argc; | |
4243cbea | 1318 | ++_dl_argv; |
91f62ce6 | 1319 | |
c70ba488 RM |
1320 | /* The initialization of _dl_stack_flags done below assumes the |
1321 | executable's PT_GNU_STACK may have been honored by the kernel, and | |
1322 | so a PT_GNU_STACK with PF_X set means the stack started out with | |
1323 | execute permission. However, this is not really true if the | |
1324 | dynamic linker is the executable the kernel loaded. For this | |
1325 | case, we must reinitialize _dl_stack_flags to match the dynamic | |
1326 | linker itself. If the dynamic linker was built with a | |
1327 | PT_GNU_STACK, then the kernel may have loaded us with a | |
1328 | nonexecutable stack that we will have to make executable when we | |
1329 | load the program below unless it has a PT_GNU_STACK indicating | |
1330 | nonexecutable stack is ok. */ | |
1331 | ||
1332 | for (ph = phdr; ph < &phdr[phnum]; ++ph) | |
1333 | if (ph->p_type == PT_GNU_STACK) | |
1334 | { | |
1335 | GL(dl_stack_flags) = ph->p_flags; | |
1336 | break; | |
1337 | } | |
1338 | ||
e0f1a58f FW |
1339 | if (__glibc_unlikely (state.mode == rtld_mode_verify |
1340 | || state.mode == rtld_mode_help)) | |
2de99474 | 1341 | { |
8e17ea58 UD |
1342 | const char *objname; |
1343 | const char *err_str = NULL; | |
993b3242 | 1344 | struct map_args args; |
74780cf6 | 1345 | bool malloced; |
2de99474 | 1346 | |
e6caf4e1 | 1347 | args.str = rtld_progname; |
f04b9a68 | 1348 | args.loader = NULL; |
f04b9a68 | 1349 | args.mode = __RTLD_OPENEXEC; |
74780cf6 UD |
1350 | (void) _dl_catch_error (&objname, &err_str, &malloced, map_doit, |
1351 | &args); | |
a1ffb40e | 1352 | if (__glibc_unlikely (err_str != NULL)) |
e0f1a58f FW |
1353 | { |
1354 | /* We don't free the returned string, the programs stops | |
1355 | anyway. */ | |
1356 | if (state.mode == rtld_mode_help) | |
1357 | /* Mask the failure to load the main object. The help | |
1358 | message contains less information in this case. */ | |
1359 | _dl_help (ld_so_name, &state); | |
1360 | else | |
1361 | _exit (EXIT_FAILURE); | |
1362 | } | |
2de99474 UD |
1363 | } |
1364 | else | |
db276fa1 | 1365 | { |
1e372ded AZ |
1366 | RTLD_TIMING_VAR (start); |
1367 | rtld_timer_start (&start); | |
798212a0 | 1368 | _dl_map_object (NULL, rtld_progname, lt_executable, 0, |
c0f62c56 | 1369 | __RTLD_OPENEXEC, LM_ID_BASE); |
1e372ded | 1370 | rtld_timer_stop (&load_time, start); |
db276fa1 | 1371 | } |
2de99474 | 1372 | |
c0f62c56 UD |
1373 | /* Now the map for the main executable is available. */ |
1374 | main_map = GL(dl_ns)[LM_ID_BASE]._ns_loaded; | |
1375 | ||
2bf9e641 | 1376 | if (__glibc_likely (state.mode == rtld_mode_normal) |
f3fd569c | 1377 | && GL(dl_rtld_map).l_info[DT_SONAME] != NULL |
01f16ab0 UD |
1378 | && main_map->l_info[DT_SONAME] != NULL |
1379 | && strcmp ((const char *) D_PTR (&GL(dl_rtld_map), l_info[DT_STRTAB]) | |
1380 | + GL(dl_rtld_map).l_info[DT_SONAME]->d_un.d_val, | |
1381 | (const char *) D_PTR (main_map, l_info[DT_STRTAB]) | |
1382 | + main_map->l_info[DT_SONAME]->d_un.d_val) == 0) | |
1383 | _dl_fatal_printf ("loader cannot load itself\n"); | |
1384 | ||
c0f62c56 UD |
1385 | phdr = main_map->l_phdr; |
1386 | phnum = main_map->l_phnum; | |
143e2b96 UD |
1387 | /* We overwrite here a pointer to a malloc()ed string. But since |
1388 | the malloc() implementation used at this point is the dummy | |
1389 | implementations which has no real free() function it does not | |
1390 | makes sense to free the old string first. */ | |
c0f62c56 UD |
1391 | main_map->l_name = (char *) ""; |
1392 | *user_entry = main_map->l_entry; | |
3a56ea26 | 1393 | |
15a0c573 CLT |
1394 | /* Set bit indicating this is the main program map. */ |
1395 | main_map->l_main_map = 1; | |
1396 | ||
bc58236c | 1397 | #ifdef HAVE_AUX_VECTOR |
3a56ea26 AK |
1398 | /* Adjust the on-stack auxiliary vector so that it looks like the |
1399 | binary was executed directly. */ | |
bc58236c | 1400 | for (ElfW(auxv_t) *av = auxv; av->a_type != AT_NULL; av++) |
3a56ea26 AK |
1401 | switch (av->a_type) |
1402 | { | |
1403 | case AT_PHDR: | |
4dd019e3 | 1404 | av->a_un.a_val = (uintptr_t) phdr; |
3a56ea26 AK |
1405 | break; |
1406 | case AT_PHNUM: | |
1407 | av->a_un.a_val = phnum; | |
1408 | break; | |
1409 | case AT_ENTRY: | |
1410 | av->a_un.a_val = *user_entry; | |
1411 | break; | |
5c349950 PP |
1412 | case AT_EXECFN: |
1413 | av->a_un.a_val = (uintptr_t) _dl_argv[0]; | |
1414 | break; | |
3a56ea26 | 1415 | } |
bc58236c | 1416 | #endif |
c6702789 VM |
1417 | |
1418 | /* Set the argv[0] string now that we've processed the executable. */ | |
1419 | if (argv0 != NULL) | |
1420 | _dl_argv[0] = argv0; | |
0200214b RM |
1421 | } |
1422 | else | |
1423 | { | |
1424 | /* Create a link_map for the executable itself. | |
1425 | This will be what dlopen on "" returns. */ | |
9fbdeb41 UD |
1426 | main_map = _dl_new_object ((char *) "", "", lt_executable, NULL, |
1427 | __RTLD_OPENEXEC, LM_ID_BASE); | |
9dcafc55 | 1428 | assert (main_map != NULL); |
c0f62c56 UD |
1429 | main_map->l_phdr = phdr; |
1430 | main_map->l_phnum = phnum; | |
1431 | main_map->l_entry = *user_entry; | |
da832465 | 1432 | |
f0967738 AK |
1433 | /* Even though the link map is not yet fully initialized we can add |
1434 | it to the map list since there are no possible users running yet. */ | |
1435 | _dl_add_to_namespace_list (main_map, LM_ID_BASE); | |
fa41c84d | 1436 | assert (main_map == GL(dl_ns)[LM_ID_BASE]._ns_loaded); |
f0967738 | 1437 | |
61e0617a UD |
1438 | /* At this point we are in a bit of trouble. We would have to |
1439 | fill in the values for l_dev and l_ino. But in general we | |
1440 | do not know where the file is. We also do not handle AT_EXECFD | |
1441 | even if it would be passed up. | |
1442 | ||
1443 | We leave the values here defined to 0. This is normally no | |
1444 | problem as the program code itself is normally no shared | |
1445 | object and therefore cannot be loaded dynamically. Nothing | |
1446 | prevent the use of dynamic binaries and in these situations | |
1447 | we might get problems. We might not be able to find out | |
1448 | whether the object is already loaded. But since there is no | |
1449 | easy way out and because the dynamic binary must also not | |
1450 | have an SONAME we ignore this program for now. If it becomes | |
1451 | a problem we can force people using SONAMEs. */ | |
1452 | ||
97a51d8a UD |
1453 | /* We delay initializing the path structure until we got the dynamic |
1454 | information for the program. */ | |
0200214b RM |
1455 | } |
1456 | ||
c0f62c56 UD |
1457 | main_map->l_map_end = 0; |
1458 | main_map->l_text_end = 0; | |
052b6a6c | 1459 | /* Perhaps the executable has no PT_LOAD header entries at all. */ |
c0f62c56 | 1460 | main_map->l_map_start = ~0; |
c0f62c56 UD |
1461 | /* And it was opened directly. */ |
1462 | ++main_map->l_direct_opencount; | |
052b6a6c | 1463 | |
0200214b | 1464 | /* Scan the program header table for the dynamic section. */ |
72f70279 | 1465 | for (ph = phdr; ph < &phdr[phnum]; ++ph) |
0200214b RM |
1466 | switch (ph->p_type) |
1467 | { | |
da832465 UD |
1468 | case PT_PHDR: |
1469 | /* Find out the load address. */ | |
c0f62c56 | 1470 | main_map->l_addr = (ElfW(Addr)) phdr - ph->p_vaddr; |
da832465 | 1471 | break; |
0200214b RM |
1472 | case PT_DYNAMIC: |
1473 | /* This tells us where to find the dynamic section, | |
1474 | which tells us everything we need to do. */ | |
c0f62c56 | 1475 | main_map->l_ld = (void *) main_map->l_addr + ph->p_vaddr; |
b413280c | 1476 | main_map->l_ld_readonly = (ph->p_flags & PF_W) == 0; |
0200214b RM |
1477 | break; |
1478 | case PT_INTERP: | |
1479 | /* This "interpreter segment" was used by the program loader to | |
1480 | find the program interpreter, which is this program itself, the | |
1481 | dynamic linker. We note what name finds us, so that a future | |
1482 | dlopen call or DT_NEEDED entry, for something that wants to link | |
1483 | against the dynamic linker as a shared library, will know that | |
1484 | the shared object is already loaded. */ | |
c0f62c56 | 1485 | _dl_rtld_libname.name = ((const char *) main_map->l_addr |
be935610 | 1486 | + ph->p_vaddr); |
752a2a50 | 1487 | /* _dl_rtld_libname.next = NULL; Already zero. */ |
d6b5d570 | 1488 | GL(dl_rtld_map).l_libname = &_dl_rtld_libname; |
f41c8091 UD |
1489 | |
1490 | /* Ordinarilly, we would get additional names for the loader from | |
1491 | our DT_SONAME. This can't happen if we were actually linked as | |
1492 | a static executable (detect this case when we have no DYNAMIC). | |
1493 | If so, assume the filename component of the interpreter path to | |
1494 | be our SONAME, and add it to our name list. */ | |
d6b5d570 | 1495 | if (GL(dl_rtld_map).l_ld == NULL) |
f41c8091 | 1496 | { |
88794e30 UD |
1497 | const char *p = NULL; |
1498 | const char *cp = _dl_rtld_libname.name; | |
1499 | ||
1500 | /* Find the filename part of the path. */ | |
1501 | while (*cp != '\0') | |
1502 | if (*cp++ == '/') | |
1503 | p = cp; | |
1504 | ||
1505 | if (p != NULL) | |
f41c8091 | 1506 | { |
88794e30 | 1507 | _dl_rtld_libname2.name = p; |
752a2a50 | 1508 | /* _dl_rtld_libname2.next = NULL; Already zero. */ |
f41c8091 UD |
1509 | _dl_rtld_libname.next = &_dl_rtld_libname2; |
1510 | } | |
1511 | } | |
1512 | ||
164a7164 | 1513 | has_interp = true; |
0200214b | 1514 | break; |
052b6a6c | 1515 | case PT_LOAD: |
052b6a6c UD |
1516 | { |
1517 | ElfW(Addr) mapstart; | |
2373b30e UD |
1518 | ElfW(Addr) allocend; |
1519 | ||
1520 | /* Remember where the main program starts in memory. */ | |
b92e3780 UD |
1521 | mapstart = (main_map->l_addr |
1522 | + (ph->p_vaddr & ~(GLRO(dl_pagesize) - 1))); | |
c0f62c56 UD |
1523 | if (main_map->l_map_start > mapstart) |
1524 | main_map->l_map_start = mapstart; | |
2373b30e UD |
1525 | |
1526 | /* Also where it ends. */ | |
c0f62c56 UD |
1527 | allocend = main_map->l_addr + ph->p_vaddr + ph->p_memsz; |
1528 | if (main_map->l_map_end < allocend) | |
1529 | main_map->l_map_end = allocend; | |
1530 | if ((ph->p_flags & PF_X) && allocend > main_map->l_text_end) | |
1531 | main_map->l_text_end = allocend; | |
052b6a6c UD |
1532 | } |
1533 | break; | |
9dcafc55 | 1534 | |
a334319f | 1535 | case PT_TLS: |
aed283dd UD |
1536 | if (ph->p_memsz > 0) |
1537 | { | |
1538 | /* Note that in the case the dynamic linker we duplicate work | |
1539 | here since we read the PT_TLS entry already in | |
1540 | _dl_start_final. But the result is repeatable so do not | |
1541 | check for this special but unimportant case. */ | |
c0f62c56 UD |
1542 | main_map->l_tls_blocksize = ph->p_memsz; |
1543 | main_map->l_tls_align = ph->p_align; | |
99fe3b0e | 1544 | if (ph->p_align == 0) |
c0f62c56 | 1545 | main_map->l_tls_firstbyte_offset = 0; |
99fe3b0e | 1546 | else |
c0f62c56 UD |
1547 | main_map->l_tls_firstbyte_offset = (ph->p_vaddr |
1548 | & (ph->p_align - 1)); | |
1549 | main_map->l_tls_initimage_size = ph->p_filesz; | |
1550 | main_map->l_tls_initimage = (void *) ph->p_vaddr; | |
aed283dd UD |
1551 | |
1552 | /* This image gets the ID one. */ | |
c0f62c56 | 1553 | GL(dl_tls_max_dtv_idx) = main_map->l_tls_modid = 1; |
aed283dd | 1554 | } |
9dcafc55 UD |
1555 | break; |
1556 | ||
ecdeaac0 RM |
1557 | case PT_GNU_STACK: |
1558 | GL(dl_stack_flags) = ph->p_flags; | |
1559 | break; | |
e8ed861d UD |
1560 | |
1561 | case PT_GNU_RELRO: | |
c0f62c56 UD |
1562 | main_map->l_relro_addr = ph->p_vaddr; |
1563 | main_map->l_relro_size = ph->p_memsz; | |
e8ed861d | 1564 | break; |
c7aa8596 SN |
1565 | } |
1566 | /* Process program headers again, but scan them backwards so | |
1567 | that PT_NOTE can be skipped if PT_GNU_PROPERTY exits. */ | |
1568 | for (ph = &phdr[phnum]; ph != phdr; --ph) | |
1569 | switch (ph[-1].p_type) | |
1570 | { | |
f753fa7d | 1571 | case PT_NOTE: |
c00452d7 | 1572 | _dl_process_pt_note (main_map, -1, &ph[-1]); |
c7aa8596 SN |
1573 | break; |
1574 | case PT_GNU_PROPERTY: | |
c00452d7 | 1575 | _dl_process_pt_gnu_property (main_map, -1, &ph[-1]); |
f753fa7d | 1576 | break; |
0200214b | 1577 | } |
11bf311e UD |
1578 | |
1579 | /* Adjust the address of the TLS initialization image in case | |
1580 | the executable is actually an ET_DYN object. */ | |
1581 | if (main_map->l_tls_initimage != NULL) | |
1582 | main_map->l_tls_initimage | |
1583 | = (char *) main_map->l_tls_initimage + main_map->l_addr; | |
c0f62c56 UD |
1584 | if (! main_map->l_map_end) |
1585 | main_map->l_map_end = ~0; | |
1586 | if (! main_map->l_text_end) | |
1587 | main_map->l_text_end = ~0; | |
d6b5d570 | 1588 | if (! GL(dl_rtld_map).l_libname && GL(dl_rtld_map).l_name) |
c84142e8 UD |
1589 | { |
1590 | /* We were invoked directly, so the program might not have a | |
1591 | PT_INTERP. */ | |
d6b5d570 | 1592 | _dl_rtld_libname.name = GL(dl_rtld_map).l_name; |
f0967738 | 1593 | /* _dl_rtld_libname.next = NULL; Already zero. */ |
d6b5d570 | 1594 | GL(dl_rtld_map).l_libname = &_dl_rtld_libname; |
c84142e8 | 1595 | } |
ffee1316 | 1596 | else |
d6b5d570 | 1597 | assert (GL(dl_rtld_map).l_libname); /* How else did we get here? */ |
0200214b | 1598 | |
9dcafc55 UD |
1599 | /* If the current libname is different from the SONAME, add the |
1600 | latter as well. */ | |
1601 | if (GL(dl_rtld_map).l_info[DT_SONAME] != NULL | |
1602 | && strcmp (GL(dl_rtld_map).l_libname->name, | |
1603 | (const char *) D_PTR (&GL(dl_rtld_map), l_info[DT_STRTAB]) | |
1604 | + GL(dl_rtld_map).l_info[DT_SONAME]->d_un.d_val) != 0) | |
1605 | { | |
1606 | static struct libname_list newname; | |
1607 | newname.name = ((char *) D_PTR (&GL(dl_rtld_map), l_info[DT_STRTAB]) | |
1608 | + GL(dl_rtld_map).l_info[DT_SONAME]->d_un.d_ptr); | |
1609 | newname.next = NULL; | |
1610 | newname.dont_free = 1; | |
1611 | ||
1612 | assert (GL(dl_rtld_map).l_libname->next == NULL); | |
1613 | GL(dl_rtld_map).l_libname->next = &newname; | |
1614 | } | |
1615 | /* The ld.so must be relocated since otherwise loading audit modules | |
1616 | will fail since they reuse the very same ld.so. */ | |
1617 | assert (GL(dl_rtld_map).l_relocated); | |
1618 | ||
9a51759b UD |
1619 | if (! rtld_is_main) |
1620 | { | |
1621 | /* Extract the contents of the dynamic section for easy access. */ | |
5118dcac | 1622 | elf_get_dynamic_info (main_map, false, false); |
4d098554 FW |
1623 | |
1624 | /* If the main map is libc.so, update the base namespace to | |
1625 | refer to this map. If libc.so is loaded later, this happens | |
1626 | in _dl_map_object_from_fd. */ | |
1627 | if (main_map->l_info[DT_SONAME] != NULL | |
1628 | && (strcmp (((const char *) D_PTR (main_map, l_info[DT_STRTAB]) | |
1629 | + main_map->l_info[DT_SONAME]->d_un.d_val), LIBC_SO) | |
1630 | == 0)) | |
1631 | GL(dl_ns)[LM_ID_BASE].libc_map = main_map; | |
1632 | ||
efec5079 | 1633 | /* Set up our cache of pointers into the hash table. */ |
c0f62c56 | 1634 | _dl_setup_hash (main_map); |
9a51759b | 1635 | } |
0200214b | 1636 | |
2bf9e641 | 1637 | if (__glibc_unlikely (state.mode == rtld_mode_verify)) |
e2102c14 UD |
1638 | { |
1639 | /* We were called just to verify that this is a dynamic | |
1640 | executable using us as the program interpreter. Exit with an | |
1641 | error if we were not able to load the binary or no interpreter | |
1642 | is specified (i.e., this is no dynamically linked binary. */ | |
c0f62c56 | 1643 | if (main_map->l_ld == NULL) |
e2102c14 | 1644 | _exit (1); |
e2102c14 UD |
1645 | |
1646 | /* We allow here some platform specific code. */ | |
1647 | #ifdef DISTINGUISH_LIB_VERSIONS | |
1648 | DISTINGUISH_LIB_VERSIONS; | |
1649 | #endif | |
eb406346 | 1650 | _exit (has_interp ? 0 : 2); |
e2102c14 UD |
1651 | } |
1652 | ||
ab1d521d | 1653 | struct link_map **first_preload = &GL(dl_rtld_map).l_next; |
ab1d521d RM |
1654 | /* Set up the data structures for the system-supplied DSO early, |
1655 | so they can influence _dl_init_paths. */ | |
9cee5585 | 1656 | setup_vdso (main_map, &first_preload); |
ab1d521d | 1657 | |
1bdda52f AZ |
1658 | /* With vDSO setup we can initialize the function pointers. */ |
1659 | setup_vdso_pointers (); | |
1660 | ||
ab1d521d | 1661 | #ifdef DL_SYSDEP_OSCHECK |
ceb809dc | 1662 | DL_SYSDEP_OSCHECK (_dl_fatal_printf); |
ab1d521d RM |
1663 | #endif |
1664 | ||
1665 | /* Initialize the data structures for the search paths for shared | |
1666 | objects. */ | |
2bf9e641 | 1667 | call_init_paths (&state); |
97a51d8a | 1668 | |
a93d9e03 | 1669 | /* Initialize _r_debug_extended. */ |
29f97654 UD |
1670 | struct r_debug *r = _dl_debug_initialize (GL(dl_rtld_map).l_addr, |
1671 | LM_ID_BASE); | |
9dcafc55 UD |
1672 | r->r_state = RT_CONSISTENT; |
1673 | ||
0200214b | 1674 | /* Put the link_map for ourselves on the chain so it can be found by |
ceb2d9aa | 1675 | name. Note that at this point the global chain of link maps contains |
d6b5d570 UD |
1676 | exactly one element, which is pointed to by dl_loaded. */ |
1677 | if (! GL(dl_rtld_map).l_name) | |
ffee1316 RM |
1678 | /* If not invoked directly, the dynamic linker shared object file was |
1679 | found by the PT_INTERP name. */ | |
d6b5d570 UD |
1680 | GL(dl_rtld_map).l_name = (char *) GL(dl_rtld_map).l_libname->name; |
1681 | GL(dl_rtld_map).l_type = lt_library; | |
c0f62c56 UD |
1682 | main_map->l_next = &GL(dl_rtld_map); |
1683 | GL(dl_rtld_map).l_prev = main_map; | |
1684 | ++GL(dl_ns)[LM_ID_BASE]._ns_nloaded; | |
e8ed861d | 1685 | ++GL(dl_load_adds); |
0200214b | 1686 | |
97fd3a30 UD |
1687 | /* If LD_USE_LOAD_BIAS env variable has not been seen, default |
1688 | to not using bias for non-prelinked PIEs and libraries | |
1689 | and using it for executables or prelinked PIEs or libraries. */ | |
afdca0f2 | 1690 | if (GLRO(dl_use_load_bias) == (ElfW(Addr)) -2) |
c0f62c56 | 1691 | GLRO(dl_use_load_bias) = main_map->l_addr == 0 ? -1 : 0; |
97fd3a30 | 1692 | |
44c4e5d5 RM |
1693 | /* Starting from binutils-2.23, the linker will define the magic symbol |
1694 | __ehdr_start to point to our own ELF header if it is visible in a | |
1695 | segment that also includes the phdrs. If that's not available, we use | |
1696 | the old method that assumes the beginning of the file is part of the | |
1697 | lowest-addressed PT_LOAD segment. */ | |
44c4e5d5 | 1698 | extern const ElfW(Ehdr) __ehdr_start __attribute__ ((visibility ("hidden"))); |
302247c8 FS |
1699 | |
1700 | /* Set up the program header information for the dynamic linker | |
1701 | itself. It is needed in the dl_iterate_phdr callbacks. */ | |
1702 | const ElfW(Ehdr) *rtld_ehdr = &__ehdr_start; | |
44c4e5d5 RM |
1703 | assert (rtld_ehdr->e_ehsize == sizeof *rtld_ehdr); |
1704 | assert (rtld_ehdr->e_phentsize == sizeof (ElfW(Phdr))); | |
1705 | ||
1706 | const ElfW(Phdr) *rtld_phdr = (const void *) rtld_ehdr + rtld_ehdr->e_phoff; | |
1707 | ||
e8ed861d | 1708 | GL(dl_rtld_map).l_phdr = rtld_phdr; |
553eca26 UD |
1709 | GL(dl_rtld_map).l_phnum = rtld_ehdr->e_phnum; |
1710 | ||
9dcafc55 | 1711 | |
e8ed861d UD |
1712 | /* PT_GNU_RELRO is usually the last phdr. */ |
1713 | size_t cnt = rtld_ehdr->e_phnum; | |
1714 | while (cnt-- > 0) | |
1715 | if (rtld_phdr[cnt].p_type == PT_GNU_RELRO) | |
1716 | { | |
1717 | GL(dl_rtld_map).l_relro_addr = rtld_phdr[cnt].p_vaddr; | |
1718 | GL(dl_rtld_map).l_relro_size = rtld_phdr[cnt].p_memsz; | |
1719 | break; | |
1720 | } | |
1721 | ||
9dcafc55 UD |
1722 | /* Add the dynamic linker to the TLS list if it also uses TLS. */ |
1723 | if (GL(dl_rtld_map).l_tls_blocksize != 0) | |
1724 | /* Assign a module ID. Do this before loading any audit modules. */ | |
ba33937b | 1725 | _dl_assign_tls_modid (&GL(dl_rtld_map)); |
9dcafc55 | 1726 | |
2bf9e641 FW |
1727 | audit_list_add_dynamic_tag (&state.audit_list, main_map, DT_AUDIT); |
1728 | audit_list_add_dynamic_tag (&state.audit_list, main_map, DT_DEPAUDIT); | |
8f7a75d7 | 1729 | |
e0f1a58f FW |
1730 | /* At this point, all data has been obtained that is included in the |
1731 | --help output. */ | |
1732 | if (__glibc_unlikely (state.mode == rtld_mode_help)) | |
1733 | _dl_help (ld_so_name, &state); | |
1734 | ||
9dcafc55 | 1735 | /* If we have auditing DSOs to load, do it now. */ |
81b82fb9 | 1736 | bool need_security_init = true; |
2bf9e641 | 1737 | if (state.audit_list.length > 0) |
9dcafc55 | 1738 | { |
2bf9e641 | 1739 | size_t naudit = audit_list_count (&state.audit_list); |
17796419 | 1740 | |
3abee0b7 UD |
1741 | /* Since we start using the auditing DSOs right away we need to |
1742 | initialize the data structures now. */ | |
17796419 | 1743 | tcbp = init_tls (naudit); |
3abee0b7 | 1744 | |
4c48ef06 UD |
1745 | /* Initialize security features. We need to do it this early |
1746 | since otherwise the constructors of the audit libraries will | |
1747 | use different values (especially the pointer guard) and will | |
1748 | fail later on. */ | |
1749 | security_init (); | |
81b82fb9 | 1750 | need_security_init = false; |
4c48ef06 | 1751 | |
2bf9e641 | 1752 | load_audit_modules (main_map, &state.audit_list); |
17796419 SN |
1753 | |
1754 | /* The count based on audit strings may overestimate the number | |
1755 | of audit modules that got loaded, but not underestimate. */ | |
1756 | assert (GLRO(dl_naudit) <= naudit); | |
9dcafc55 UD |
1757 | } |
1758 | ||
d0503676 CD |
1759 | /* Keep track of the currently loaded modules to count how many |
1760 | non-audit modules which use TLS are loaded. */ | |
1761 | size_t count_modids = _dl_count_modids (); | |
1762 | ||
c63d8f80 UD |
1763 | /* Set up debugging before the debugger is notified for the first time. */ |
1764 | #ifdef ELF_MACHINE_DEBUG_SETUP | |
1765 | /* Some machines (e.g. MIPS) don't use DT_DEBUG in this way. */ | |
1766 | ELF_MACHINE_DEBUG_SETUP (main_map, r); | |
c63d8f80 UD |
1767 | #else |
1768 | if (main_map->l_info[DT_DEBUG] != NULL) | |
1769 | /* There is a DT_DEBUG entry in the dynamic section. Fill it in | |
1770 | with the run-time address of the r_debug structure */ | |
1771 | main_map->l_info[DT_DEBUG]->d_un.d_ptr = (ElfW(Addr)) r; | |
c63d8f80 UD |
1772 | #endif |
1773 | ||
9dcafc55 UD |
1774 | /* We start adding objects. */ |
1775 | r->r_state = RT_ADD; | |
1776 | _dl_debug_state (); | |
815e6fa3 | 1777 | LIBC_PROBE (init_start, 2, LM_ID_BASE, r); |
9dcafc55 UD |
1778 | |
1779 | /* Auditing checkpoint: we are ready to signal that the initial map | |
1780 | is being constructed. */ | |
a1ffb40e | 1781 | if (__glibc_unlikely (GLRO(dl_naudit) > 0)) |
9dcafc55 UD |
1782 | { |
1783 | struct audit_ifaces *afct = GLRO(dl_audit); | |
1784 | for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt) | |
1785 | { | |
1786 | if (afct->activity != NULL) | |
e1d559f3 FW |
1787 | afct->activity (&link_map_audit_state (main_map, cnt)->cookie, |
1788 | LA_ACT_ADD); | |
9dcafc55 UD |
1789 | |
1790 | afct = afct->next; | |
1791 | } | |
1792 | } | |
1793 | ||
14bab8de | 1794 | /* We have two ways to specify objects to preload: via environment |
49c091e5 | 1795 | variable and via the file /etc/ld.so.preload. The latter can also |
14bab8de | 1796 | be used when security is enabled. */ |
ab1d521d | 1797 | assert (*first_preload == NULL); |
20fe49b9 UD |
1798 | struct link_map **preloads = NULL; |
1799 | unsigned int npreloads = 0; | |
14bab8de | 1800 | |
2bf9e641 | 1801 | if (__glibc_unlikely (state.preloadlist != NULL)) |
c4029823 | 1802 | { |
1e372ded AZ |
1803 | RTLD_TIMING_VAR (start); |
1804 | rtld_timer_start (&start); | |
2bf9e641 FW |
1805 | npreloads += handle_preload_list (state.preloadlist, main_map, |
1806 | "LD_PRELOAD"); | |
1e372ded | 1807 | rtld_timer_accum (&load_time, start); |
8692ebdb DN |
1808 | } |
1809 | ||
2bf9e641 | 1810 | if (__glibc_unlikely (state.preloadarg != NULL)) |
8692ebdb | 1811 | { |
1e372ded AZ |
1812 | RTLD_TIMING_VAR (start); |
1813 | rtld_timer_start (&start); | |
2bf9e641 FW |
1814 | npreloads += handle_preload_list (state.preloadarg, main_map, |
1815 | "--preload"); | |
1e372ded | 1816 | rtld_timer_accum (&load_time, start); |
c4029823 UD |
1817 | } |
1818 | ||
761490a1 UD |
1819 | /* There usually is no ld.so.preload file, it should only be used |
1820 | for emergencies and testing. So the open call etc should usually | |
1821 | fail. Using access() on a non-existing file is faster than using | |
1822 | open(). So we do this first. If it succeeds we do almost twice | |
1823 | the work but this does not matter, since it is not for production | |
1824 | use. */ | |
1825 | static const char preload_file[] = "/etc/ld.so.preload"; | |
a1ffb40e | 1826 | if (__glibc_unlikely (__access (preload_file, R_OK) == 0)) |
14bab8de | 1827 | { |
761490a1 UD |
1828 | /* Read the contents of the file. */ |
1829 | file = _dl_sysdep_read_whole_file (preload_file, &file_size, | |
1830 | PROT_READ | PROT_WRITE); | |
a1ffb40e | 1831 | if (__glibc_unlikely (file != MAP_FAILED)) |
14bab8de | 1832 | { |
761490a1 UD |
1833 | /* Parse the file. It contains names of libraries to be loaded, |
1834 | separated by white spaces or `:'. It may also contain | |
1835 | comments introduced by `#'. */ | |
1836 | char *problem; | |
1837 | char *runp; | |
1838 | size_t rest; | |
1839 | ||
1840 | /* Eliminate comments. */ | |
e2102c14 | 1841 | runp = file; |
761490a1 UD |
1842 | rest = file_size; |
1843 | while (rest > 0) | |
1844 | { | |
1845 | char *comment = memchr (runp, '#', rest); | |
1846 | if (comment == NULL) | |
1847 | break; | |
1848 | ||
1849 | rest -= comment - runp; | |
1850 | do | |
1851 | *comment = ' '; | |
1852 | while (--rest > 0 && *++comment != '\n'); | |
1853 | } | |
1854 | ||
1855 | /* We have one problematic case: if we have a name at the end of | |
1856 | the file without a trailing terminating characters, we cannot | |
1857 | place the \0. Handle the case separately. */ | |
1858 | if (file[file_size - 1] != ' ' && file[file_size - 1] != '\t' | |
1859 | && file[file_size - 1] != '\n' && file[file_size - 1] != ':') | |
1860 | { | |
1861 | problem = &file[file_size]; | |
1862 | while (problem > file && problem[-1] != ' ' | |
1863 | && problem[-1] != '\t' | |
1864 | && problem[-1] != '\n' && problem[-1] != ':') | |
1865 | --problem; | |
1866 | ||
1867 | if (problem > file) | |
1868 | problem[-1] = '\0'; | |
1869 | } | |
1870 | else | |
1871 | { | |
1872 | problem = NULL; | |
1873 | file[file_size - 1] = '\0'; | |
1874 | } | |
f04b9a68 | 1875 | |
1e372ded AZ |
1876 | RTLD_TIMING_VAR (start); |
1877 | rtld_timer_start (&start); | |
f04b9a68 | 1878 | |
761490a1 UD |
1879 | if (file != problem) |
1880 | { | |
1881 | char *p; | |
1882 | runp = file; | |
1883 | while ((p = strsep (&runp, ": \t\n")) != NULL) | |
1884 | if (p[0] != '\0') | |
20fe49b9 | 1885 | npreloads += do_preload (p, main_map, preload_file); |
761490a1 UD |
1886 | } |
1887 | ||
1888 | if (problem != NULL) | |
1889 | { | |
1890 | char *p = strndupa (problem, file_size - (problem - file)); | |
20fe49b9 UD |
1891 | |
1892 | npreloads += do_preload (p, main_map, preload_file); | |
761490a1 | 1893 | } |
14bab8de | 1894 | |
1e372ded | 1895 | rtld_timer_accum (&load_time, start); |
db276fa1 | 1896 | |
761490a1 UD |
1897 | /* We don't need the file anymore. */ |
1898 | __munmap (file, file_size); | |
1899 | } | |
14bab8de UD |
1900 | } |
1901 | ||
a1ffb40e | 1902 | if (__glibc_unlikely (*first_preload != NULL)) |
14bab8de UD |
1903 | { |
1904 | /* Set up PRELOADS with a vector of the preloaded libraries. */ | |
ab1d521d | 1905 | struct link_map *l = *first_preload; |
14bab8de | 1906 | preloads = __alloca (npreloads * sizeof preloads[0]); |
14bab8de UD |
1907 | i = 0; |
1908 | do | |
1909 | { | |
1910 | preloads[i++] = l; | |
1911 | l = l->l_next; | |
1912 | } while (l); | |
1913 | assert (i == npreloads); | |
1914 | } | |
1915 | ||
2064087b RM |
1916 | /* Load all the libraries specified by DT_NEEDED entries. If LD_PRELOAD |
1917 | specified some libraries to load, these are inserted before the actual | |
1918 | dependencies in the executable's searchlist for symbol resolution. */ | |
1e372ded AZ |
1919 | { |
1920 | RTLD_TIMING_VAR (start); | |
1921 | rtld_timer_start (&start); | |
2bf9e641 FW |
1922 | _dl_map_object_deps (main_map, preloads, npreloads, |
1923 | state.mode == rtld_mode_trace, 0); | |
1e372ded AZ |
1924 | rtld_timer_accum (&load_time, start); |
1925 | } | |
e3e35cfc | 1926 | |
20fe49b9 | 1927 | /* Mark all objects as being in the global scope. */ |
c0f62c56 | 1928 | for (i = main_map->l_searchlist.r_nlist; i > 0; ) |
20fe49b9 | 1929 | main_map->l_searchlist.r_list[--i]->l_global = 1; |
d66e34cd | 1930 | |
f9496a7b | 1931 | /* Remove _dl_rtld_map from the chain. */ |
d6b5d570 | 1932 | GL(dl_rtld_map).l_prev->l_next = GL(dl_rtld_map).l_next; |
20fe49b9 | 1933 | if (GL(dl_rtld_map).l_next != NULL) |
d6b5d570 | 1934 | GL(dl_rtld_map).l_next->l_prev = GL(dl_rtld_map).l_prev; |
f9496a7b | 1935 | |
20fe49b9 UD |
1936 | for (i = 1; i < main_map->l_searchlist.r_nlist; ++i) |
1937 | if (main_map->l_searchlist.r_list[i] == &GL(dl_rtld_map)) | |
1938 | break; | |
1939 | ||
1940 | bool rtld_multiple_ref = false; | |
a1ffb40e | 1941 | if (__glibc_likely (i < main_map->l_searchlist.r_nlist)) |
0200214b | 1942 | { |
f9496a7b RM |
1943 | /* Some DT_NEEDED entry referred to the interpreter object itself, so |
1944 | put it back in the list of visible objects. We insert it into the | |
1945 | chain in symbol search order because gdb uses the chain's order as | |
1946 | its symbol search order. */ | |
20fe49b9 UD |
1947 | rtld_multiple_ref = true; |
1948 | ||
c0f62c56 | 1949 | GL(dl_rtld_map).l_prev = main_map->l_searchlist.r_list[i - 1]; |
2bf9e641 | 1950 | if (__glibc_likely (state.mode == rtld_mode_normal)) |
3b3ddb4f | 1951 | { |
c0f62c56 UD |
1952 | GL(dl_rtld_map).l_next = (i + 1 < main_map->l_searchlist.r_nlist |
1953 | ? main_map->l_searchlist.r_list[i + 1] | |
3b3ddb4f | 1954 | : NULL); |
7775448e | 1955 | #ifdef NEED_DL_SYSINFO_DSO |
ab1d521d RM |
1956 | if (GLRO(dl_sysinfo_map) != NULL |
1957 | && GL(dl_rtld_map).l_prev->l_next == GLRO(dl_sysinfo_map) | |
1958 | && GL(dl_rtld_map).l_next != GLRO(dl_sysinfo_map)) | |
1959 | GL(dl_rtld_map).l_prev = GLRO(dl_sysinfo_map); | |
3b3ddb4f UD |
1960 | #endif |
1961 | } | |
b2bcd61a UD |
1962 | else |
1963 | /* In trace mode there might be an invisible object (which we | |
1964 | could not find) after the previous one in the search list. | |
1965 | In this case it doesn't matter much where we put the | |
1966 | interpreter object, so we just initialize the list pointer so | |
1967 | that the assertion below holds. */ | |
d6b5d570 | 1968 | GL(dl_rtld_map).l_next = GL(dl_rtld_map).l_prev->l_next; |
b2bcd61a | 1969 | |
d6b5d570 UD |
1970 | assert (GL(dl_rtld_map).l_prev->l_next == GL(dl_rtld_map).l_next); |
1971 | GL(dl_rtld_map).l_prev->l_next = &GL(dl_rtld_map); | |
3fb55878 | 1972 | if (GL(dl_rtld_map).l_next != NULL) |
f9496a7b | 1973 | { |
d6b5d570 UD |
1974 | assert (GL(dl_rtld_map).l_next->l_prev == GL(dl_rtld_map).l_prev); |
1975 | GL(dl_rtld_map).l_next->l_prev = &GL(dl_rtld_map); | |
f9496a7b | 1976 | } |
0200214b | 1977 | } |
d66e34cd | 1978 | |
c84142e8 UD |
1979 | /* Now let us see whether all libraries are available in the |
1980 | versions we need. */ | |
1981 | { | |
993b3242 | 1982 | struct version_check_args args; |
2bf9e641 FW |
1983 | args.doexit = state.mode == rtld_mode_normal; |
1984 | args.dotrace = state.mode == rtld_mode_trace; | |
993b3242 | 1985 | _dl_receive_error (print_missing_version, version_check_doit, &args); |
c84142e8 UD |
1986 | } |
1987 | ||
2d148689 RM |
1988 | /* We do not initialize any of the TLS functionality unless any of the |
1989 | initial modules uses TLS. This makes dynamic loading of modules with | |
1990 | TLS impossible, but to support it requires either eagerly doing setup | |
1991 | now or lazily doing it later. Doing it now makes us incompatible with | |
1992 | an old kernel that can't perform TLS_INIT_TP, even if no TLS is ever | |
1993 | used. Trying to do it lazily is too hairy to try when there could be | |
1994 | multiple threads (from a non-TLS-using libpthread). */ | |
9dcafc55 | 1995 | bool was_tls_init_tp_called = tls_init_tp_called; |
35f1e827 | 1996 | if (tcbp == NULL) |
17796419 | 1997 | tcbp = init_tls (0); |
0ecb606c | 1998 | |
81b82fb9 | 1999 | if (__glibc_likely (need_security_init)) |
4c48ef06 UD |
2000 | /* Initialize security features. But only if we have not done it |
2001 | earlier. */ | |
2002 | security_init (); | |
827b7087 | 2003 | |
2bf9e641 | 2004 | if (__glibc_unlikely (state.mode != rtld_mode_normal)) |
0200214b RM |
2005 | { |
2006 | /* We were run just to list the shared libraries. It is | |
2007 | important that we do this before real relocation, because the | |
2008 | functions we call below for output may no longer work properly | |
2009 | after relocation. */ | |
81f3ac4c UD |
2010 | struct link_map *l; |
2011 | ||
afdca0f2 | 2012 | if (GLRO(dl_debug_mask) & DL_DEBUG_PRELINK) |
ceb2d9aa | 2013 | { |
c0f62c56 | 2014 | struct r_scope_elem *scope = &main_map->l_searchlist; |
ceb2d9aa | 2015 | |
81f3ac4c | 2016 | for (i = 0; i < scope->r_nlist; i++) |
32e6df36 | 2017 | { |
81f3ac4c UD |
2018 | l = scope->r_list [i]; |
2019 | if (l->l_faked) | |
32e6df36 | 2020 | { |
81f3ac4c UD |
2021 | _dl_printf ("\t%s => not found\n", l->l_libname->name); |
2022 | continue; | |
2023 | } | |
afdca0f2 UD |
2024 | if (_dl_name_match_p (GLRO(dl_trace_prelink), l)) |
2025 | GLRO(dl_trace_prelink_map) = l; | |
81f3ac4c | 2026 | _dl_printf ("\t%s => %s (0x%0*Zx, 0x%0*Zx)", |
b9375348 SP |
2027 | DSO_FILENAME (l->l_libname->name), |
2028 | DSO_FILENAME (l->l_name), | |
d347a4ab UD |
2029 | (int) sizeof l->l_map_start * 2, |
2030 | (size_t) l->l_map_start, | |
2031 | (int) sizeof l->l_addr * 2, | |
2032 | (size_t) l->l_addr); | |
11bf311e | 2033 | |
81f3ac4c UD |
2034 | if (l->l_tls_modid) |
2035 | _dl_printf (" TLS(0x%Zx, 0x%0*Zx)\n", l->l_tls_modid, | |
2036 | (int) sizeof l->l_tls_offset * 2, | |
d347a4ab | 2037 | (size_t) l->l_tls_offset); |
81f3ac4c | 2038 | else |
81f3ac4c | 2039 | _dl_printf ("\n"); |
32e6df36 | 2040 | } |
ceb2d9aa | 2041 | } |
7a11603d UD |
2042 | else if (GLRO(dl_debug_mask) & DL_DEBUG_UNUSED) |
2043 | { | |
2044 | /* Look through the dependencies of the main executable | |
2045 | and determine which of them is not actually | |
2046 | required. */ | |
c0f62c56 | 2047 | struct link_map *l = main_map; |
7a11603d UD |
2048 | |
2049 | /* Relocate the main executable. */ | |
2ca285b0 | 2050 | struct relocate_args args = { .l = l, |
3a62d00d AS |
2051 | .reloc_mode = ((GLRO(dl_lazy) |
2052 | ? RTLD_LAZY : 0) | |
2053 | | __RTLD_NOIFUNC) }; | |
7a11603d UD |
2054 | _dl_receive_error (print_unresolved, relocate_doit, &args); |
2055 | ||
2056 | /* This loop depends on the dependencies of the executable to | |
2057 | correspond in number and order to the DT_NEEDED entries. */ | |
c0f62c56 | 2058 | ElfW(Dyn) *dyn = main_map->l_ld; |
7a11603d UD |
2059 | bool first = true; |
2060 | while (dyn->d_tag != DT_NULL) | |
2061 | { | |
2062 | if (dyn->d_tag == DT_NEEDED) | |
2063 | { | |
2064 | l = l->l_next; | |
7775448e | 2065 | #ifdef NEED_DL_SYSINFO_DSO |
ff9f1c5f DM |
2066 | /* Skip the VDSO since it's not part of the list |
2067 | of objects we brought in via DT_NEEDED entries. */ | |
2068 | if (l == GLRO(dl_sysinfo_map)) | |
2069 | l = l->l_next; | |
2070 | #endif | |
7a11603d UD |
2071 | if (!l->l_used) |
2072 | { | |
2073 | if (first) | |
2074 | { | |
2075 | _dl_printf ("Unused direct dependencies:\n"); | |
2076 | first = false; | |
2077 | } | |
2078 | ||
2079 | _dl_printf ("\t%s\n", l->l_name); | |
2080 | } | |
2081 | } | |
2082 | ||
2083 | ++dyn; | |
2084 | } | |
2085 | ||
2086 | _exit (first != true); | |
2087 | } | |
c0f62c56 | 2088 | else if (! main_map->l_info[DT_NEEDED]) |
81f3ac4c UD |
2089 | _dl_printf ("\tstatically linked\n"); |
2090 | else | |
2091 | { | |
c0f62c56 | 2092 | for (l = main_map->l_next; l; l = l->l_next) |
81f3ac4c UD |
2093 | if (l->l_faked) |
2094 | /* The library was not found. */ | |
2095 | _dl_printf ("\t%s => not found\n", l->l_libname->name); | |
75489693 | 2096 | else if (strcmp (l->l_libname->name, l->l_name) == 0) |
7a11603d UD |
2097 | _dl_printf ("\t%s (0x%0*Zx)\n", l->l_libname->name, |
2098 | (int) sizeof l->l_map_start * 2, | |
2099 | (size_t) l->l_map_start); | |
81f3ac4c UD |
2100 | else |
2101 | _dl_printf ("\t%s => %s (0x%0*Zx)\n", l->l_libname->name, | |
2102 | l->l_name, (int) sizeof l->l_map_start * 2, | |
d347a4ab | 2103 | (size_t) l->l_map_start); |
81f3ac4c | 2104 | } |
1a3a58fd | 2105 | |
2bf9e641 | 2106 | if (__glibc_unlikely (state.mode != rtld_mode_trace)) |
5a47e7f2 | 2107 | for (i = 1; i < (unsigned int) _dl_argc; ++i) |
cddcfecf RM |
2108 | { |
2109 | const ElfW(Sym) *ref = NULL; | |
c0282c06 UD |
2110 | ElfW(Addr) loadbase; |
2111 | lookup_t result; | |
c0282c06 | 2112 | |
4243cbea | 2113 | result = _dl_lookup_symbol_x (_dl_argv[i], main_map, |
11bf311e UD |
2114 | &ref, main_map->l_scope, |
2115 | NULL, ELF_RTYPE_CLASS_PLT, | |
021723ab | 2116 | DL_LOOKUP_ADD_DEPENDENCY, NULL); |
c0282c06 | 2117 | |
10a446dd | 2118 | loadbase = LOOKUP_VALUE_ADDRESS (result, false); |
c0282c06 | 2119 | |
35fc382a | 2120 | _dl_printf ("%s found at 0x%0*Zd in object at 0x%0*Zd\n", |
4243cbea | 2121 | _dl_argv[i], |
d347a4ab UD |
2122 | (int) sizeof ref->st_value * 2, |
2123 | (size_t) ref->st_value, | |
2124 | (int) sizeof loadbase * 2, (size_t) loadbase); | |
cddcfecf | 2125 | } |
ce37fa88 | 2126 | else |
fd26970f | 2127 | { |
20fe49b9 | 2128 | /* If LD_WARN is set, warn about undefined symbols. */ |
afdca0f2 | 2129 | if (GLRO(dl_lazy) >= 0 && GLRO(dl_verbose)) |
ce37fa88 UD |
2130 | { |
2131 | /* We have to do symbol dependency testing. */ | |
2132 | struct relocate_args args; | |
48b67d71 | 2133 | unsigned int i; |
993b3242 | 2134 | |
3a62d00d AS |
2135 | args.reloc_mode = ((GLRO(dl_lazy) ? RTLD_LAZY : 0) |
2136 | | __RTLD_NOIFUNC); | |
fd26970f | 2137 | |
48b67d71 AS |
2138 | i = main_map->l_searchlist.r_nlist; |
2139 | while (i-- > 0) | |
ce37fa88 | 2140 | { |
48b67d71 | 2141 | struct link_map *l = main_map->l_initfini[i]; |
d6b5d570 | 2142 | if (l != &GL(dl_rtld_map) && ! l->l_faked) |
ce37fa88 UD |
2143 | { |
2144 | args.l = l; | |
2145 | _dl_receive_error (print_unresolved, relocate_doit, | |
2146 | &args); | |
ce37fa88 | 2147 | } |
20fe49b9 | 2148 | } |
32e6df36 | 2149 | |
afdca0f2 | 2150 | if ((GLRO(dl_debug_mask) & DL_DEBUG_PRELINK) |
20fe49b9 | 2151 | && rtld_multiple_ref) |
e38c954b UD |
2152 | { |
2153 | /* Mark the link map as not yet relocated again. */ | |
2154 | GL(dl_rtld_map).l_relocated = 0; | |
11bf311e | 2155 | _dl_relocate_object (&GL(dl_rtld_map), |
3a62d00d | 2156 | main_map->l_scope, __RTLD_NOIFUNC, 0); |
e38c954b | 2157 | } |
3a56ea26 | 2158 | } |
b0982c4a | 2159 | #define VERNEEDTAG (DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGIDX (DT_VERNEED)) |
2bf9e641 | 2160 | if (state.version_info) |
fd26970f | 2161 | { |
ce37fa88 UD |
2162 | /* Print more information. This means here, print information |
2163 | about the versions needed. */ | |
2164 | int first = 1; | |
c0f62c56 | 2165 | struct link_map *map; |
ce37fa88 | 2166 | |
c0f62c56 | 2167 | for (map = main_map; map != NULL; map = map->l_next) |
fd26970f | 2168 | { |
f41c8091 | 2169 | const char *strtab; |
ce37fa88 | 2170 | ElfW(Dyn) *dyn = map->l_info[VERNEEDTAG]; |
f41c8091 UD |
2171 | ElfW(Verneed) *ent; |
2172 | ||
2173 | if (dyn == NULL) | |
2174 | continue; | |
2175 | ||
a42195db | 2176 | strtab = (const void *) D_PTR (map, l_info[DT_STRTAB]); |
f41c8091 | 2177 | ent = (ElfW(Verneed) *) (map->l_addr + dyn->d_un.d_ptr); |
ce37fa88 | 2178 | |
f41c8091 | 2179 | if (first) |
ce37fa88 | 2180 | { |
35fc382a | 2181 | _dl_printf ("\n\tVersion information:\n"); |
f41c8091 UD |
2182 | first = 0; |
2183 | } | |
ce37fa88 | 2184 | |
b9375348 | 2185 | _dl_printf ("\t%s:\n", DSO_FILENAME (map->l_name)); |
f41c8091 UD |
2186 | |
2187 | while (1) | |
2188 | { | |
2189 | ElfW(Vernaux) *aux; | |
2190 | struct link_map *needed; | |
ce37fa88 | 2191 | |
f41c8091 UD |
2192 | needed = find_needed (strtab + ent->vn_file); |
2193 | aux = (ElfW(Vernaux) *) ((char *) ent + ent->vn_aux); | |
ce37fa88 UD |
2194 | |
2195 | while (1) | |
2196 | { | |
f41c8091 UD |
2197 | const char *fname = NULL; |
2198 | ||
f41c8091 | 2199 | if (needed != NULL |
ba9fcb3f UD |
2200 | && match_version (strtab + aux->vna_name, |
2201 | needed)) | |
f41c8091 UD |
2202 | fname = needed->l_name; |
2203 | ||
35fc382a UD |
2204 | _dl_printf ("\t\t%s (%s) %s=> %s\n", |
2205 | strtab + ent->vn_file, | |
2206 | strtab + aux->vna_name, | |
2207 | aux->vna_flags & VER_FLG_WEAK | |
2208 | ? "[WEAK] " : "", | |
2209 | fname ?: "not found"); | |
ce37fa88 | 2210 | |
f41c8091 UD |
2211 | if (aux->vna_next == 0) |
2212 | /* No more symbols. */ | |
ce37fa88 UD |
2213 | break; |
2214 | ||
f41c8091 UD |
2215 | /* Next symbol. */ |
2216 | aux = (ElfW(Vernaux) *) ((char *) aux | |
2217 | + aux->vna_next); | |
ce37fa88 | 2218 | } |
f41c8091 UD |
2219 | |
2220 | if (ent->vn_next == 0) | |
2221 | /* No more dependencies. */ | |
2222 | break; | |
2223 | ||
2224 | /* Next dependency. */ | |
2225 | ent = (ElfW(Verneed) *) ((char *) ent + ent->vn_next); | |
ce37fa88 | 2226 | } |
fd26970f | 2227 | } |
ce37fa88 | 2228 | } |
fd26970f | 2229 | } |
d66e34cd | 2230 | |
0200214b RM |
2231 | _exit (0); |
2232 | } | |
86d2c878 | 2233 | |
c0f62c56 | 2234 | if (main_map->l_info[ADDRIDX (DT_GNU_LIBLIST)] |
768027a4 UD |
2235 | && ! __builtin_expect (GLRO(dl_profile) != NULL, 0) |
2236 | && ! __builtin_expect (GLRO(dl_dynamic_weak), 0)) | |
32e6df36 UD |
2237 | { |
2238 | ElfW(Lib) *liblist, *liblistend; | |
2239 | struct link_map **r_list, **r_listend, *l; | |
c0f62c56 | 2240 | const char *strtab = (const void *) D_PTR (main_map, l_info[DT_STRTAB]); |
32e6df36 | 2241 | |
c0f62c56 | 2242 | assert (main_map->l_info[VALIDX (DT_GNU_LIBLISTSZ)] != NULL); |
32e6df36 | 2243 | liblist = (ElfW(Lib) *) |
c0f62c56 | 2244 | main_map->l_info[ADDRIDX (DT_GNU_LIBLIST)]->d_un.d_ptr; |
32e6df36 | 2245 | liblistend = (ElfW(Lib) *) |
34a5a146 JM |
2246 | ((char *) liblist |
2247 | + main_map->l_info[VALIDX (DT_GNU_LIBLISTSZ)]->d_un.d_val); | |
c0f62c56 UD |
2248 | r_list = main_map->l_searchlist.r_list; |
2249 | r_listend = r_list + main_map->l_searchlist.r_nlist; | |
32e6df36 UD |
2250 | |
2251 | for (; r_list < r_listend && liblist < liblistend; r_list++) | |
2252 | { | |
2253 | l = *r_list; | |
2254 | ||
c0f62c56 | 2255 | if (l == main_map) |
32e6df36 UD |
2256 | continue; |
2257 | ||
2258 | /* If the library is not mapped where it should, fail. */ | |
2259 | if (l->l_addr) | |
2260 | break; | |
2261 | ||
2262 | /* Next, check if checksum matches. */ | |
2263 | if (l->l_info [VALIDX(DT_CHECKSUM)] == NULL | |
2264 | || l->l_info [VALIDX(DT_CHECKSUM)]->d_un.d_val | |
2265 | != liblist->l_checksum) | |
2266 | break; | |
2267 | ||
2268 | if (l->l_info [VALIDX(DT_GNU_PRELINKED)] == NULL | |
2269 | || l->l_info [VALIDX(DT_GNU_PRELINKED)]->d_un.d_val | |
2270 | != liblist->l_time_stamp) | |
2271 | break; | |
2272 | ||
2273 | if (! _dl_name_match_p (strtab + liblist->l_name, l)) | |
2274 | break; | |
2275 | ||
2276 | ++liblist; | |
2277 | } | |
2278 | ||
2279 | ||
2280 | if (r_list == r_listend && liblist == liblistend) | |
164a7164 | 2281 | prelinked = true; |
32e6df36 | 2282 | |
a1ffb40e | 2283 | if (__glibc_unlikely (GLRO(dl_debug_mask) & DL_DEBUG_LIBS)) |
b85a0f39 UD |
2284 | _dl_debug_printf ("\nprelink checking: %s\n", |
2285 | prelinked ? "ok" : "failed"); | |
32e6df36 UD |
2286 | } |
2287 | ||
ed20b3d9 | 2288 | |
c31e278f | 2289 | /* Now set up the variable which helps the assembler startup code. */ |
c0f62c56 | 2290 | GL(dl_ns)[LM_ID_BASE]._ns_main_searchlist = &main_map->l_searchlist; |
c31e278f UD |
2291 | |
2292 | /* Save the information about the original global scope list since | |
2293 | we need it in the memory handling later. */ | |
c0f62c56 | 2294 | GLRO(dl_initial_searchlist) = *GL(dl_ns)[LM_ID_BASE]._ns_main_searchlist; |
c31e278f | 2295 | |
e23fe25b | 2296 | /* Remember the last search directory added at startup, now that |
8e1472d2 FW |
2297 | malloc will no longer be the one from dl-minimal.c. As a side |
2298 | effect, this marks ld.so as initialized, so that the rtld_active | |
2299 | function returns true from now on. */ | |
e23fe25b AS |
2300 | GLRO(dl_init_all_dirs) = GL(dl_all_dirs); |
2301 | ||
73d7af4f | 2302 | /* Print scope information. */ |
a1ffb40e | 2303 | if (__glibc_unlikely (GLRO(dl_debug_mask) & DL_DEBUG_SCOPES)) |
73d7af4f UD |
2304 | { |
2305 | _dl_debug_printf ("\nInitial object scopes\n"); | |
2306 | ||
2307 | for (struct link_map *l = main_map; l != NULL; l = l->l_next) | |
174baab3 | 2308 | _dl_show_scope (l, 0); |
73d7af4f UD |
2309 | } |
2310 | ||
f753fa7d L |
2311 | _rtld_main_check (main_map, _dl_argv[0]); |
2312 | ||
32e6df36 UD |
2313 | if (prelinked) |
2314 | { | |
c0f62c56 | 2315 | if (main_map->l_info [ADDRIDX (DT_GNU_CONFLICT)] != NULL) |
32e6df36 UD |
2316 | { |
2317 | ElfW(Rela) *conflict, *conflictend; | |
32e6df36 | 2318 | |
1e372ded AZ |
2319 | RTLD_TIMING_VAR (start); |
2320 | rtld_timer_start (&start); | |
2321 | ||
c0f62c56 | 2322 | assert (main_map->l_info [VALIDX (DT_GNU_CONFLICTSZ)] != NULL); |
32e6df36 | 2323 | conflict = (ElfW(Rela) *) |
c0f62c56 | 2324 | main_map->l_info [ADDRIDX (DT_GNU_CONFLICT)]->d_un.d_ptr; |
32e6df36 | 2325 | conflictend = (ElfW(Rela) *) |
d89ae1d5 | 2326 | ((char *) conflict |
c0f62c56 UD |
2327 | + main_map->l_info [VALIDX (DT_GNU_CONFLICTSZ)]->d_un.d_val); |
2328 | _dl_resolve_conflicts (main_map, conflict, conflictend); | |
1e372ded AZ |
2329 | |
2330 | rtld_timer_stop (&relocate_time, start); | |
32e6df36 UD |
2331 | } |
2332 | ||
3a0ecccb FW |
2333 | /* The library defining malloc has already been relocated due to |
2334 | prelinking. Resolve the malloc symbols for the dynamic | |
2335 | loader. */ | |
2336 | __rtld_malloc_init_real (main_map); | |
d89ae1d5 | 2337 | |
d6163dfd FW |
2338 | /* Likewise for the locking implementation. */ |
2339 | __rtld_mutex_init (); | |
2340 | ||
d89ae1d5 | 2341 | /* Mark all the objects so we know they have been already relocated. */ |
9dcafc55 | 2342 | for (struct link_map *l = main_map; l != NULL; l = l->l_next) |
e8648a5a UD |
2343 | { |
2344 | l->l_relocated = 1; | |
2345 | if (l->l_relro_size) | |
2346 | _dl_protect_relro (l); | |
9dcafc55 UD |
2347 | |
2348 | /* Add object to slot information data if necessasy. */ | |
2349 | if (l->l_tls_blocksize != 0 && tls_init_tp_called) | |
a509eb11 | 2350 | _dl_add_to_slotinfo (l, true); |
e8648a5a | 2351 | } |
32e6df36 UD |
2352 | } |
2353 | else | |
164a7164 UD |
2354 | { |
2355 | /* Now we have all the objects loaded. Relocate them all except for | |
2356 | the dynamic linker itself. We do this in reverse order so that copy | |
2357 | relocs of earlier objects overwrite the data written by later | |
2358 | objects. We do not re-relocate the dynamic linker itself in this | |
2359 | loop because that could result in the GOT entries for functions we | |
2360 | call being changed, and that would break us. It is safe to relocate | |
2361 | the dynamic linker out of order because it has no copy relocs (we | |
2362 | know that because it is self-contained). */ | |
2363 | ||
afdca0f2 | 2364 | int consider_profiling = GLRO(dl_profile) != NULL; |
c0fb8a56 | 2365 | |
164a7164 | 2366 | /* If we are profiling we also must do lazy reloaction. */ |
afdca0f2 | 2367 | GLRO(dl_lazy) |= consider_profiling; |
c0fb8a56 | 2368 | |
1e372ded AZ |
2369 | RTLD_TIMING_VAR (start); |
2370 | rtld_timer_start (&start); | |
2bc17433 AS |
2371 | unsigned i = main_map->l_searchlist.r_nlist; |
2372 | while (i-- > 0) | |
164a7164 | 2373 | { |
2bc17433 AS |
2374 | struct link_map *l = main_map->l_initfini[i]; |
2375 | ||
164a7164 UD |
2376 | /* While we are at it, help the memory handling a bit. We have to |
2377 | mark some data structures as allocated with the fake malloc() | |
2378 | implementation in ld.so. */ | |
2379 | struct libname_list *lnp = l->l_libname->next; | |
752a2a50 | 2380 | |
164a7164 UD |
2381 | while (__builtin_expect (lnp != NULL, 0)) |
2382 | { | |
2383 | lnp->dont_free = 1; | |
2384 | lnp = lnp->next; | |
2385 | } | |
0479b305 AS |
2386 | /* Also allocated with the fake malloc(). */ |
2387 | l->l_free_initfini = 0; | |
752a2a50 | 2388 | |
164a7164 | 2389 | if (l != &GL(dl_rtld_map)) |
2ca285b0 | 2390 | _dl_relocate_object (l, l->l_scope, GLRO(dl_lazy) ? RTLD_LAZY : 0, |
154d10bd | 2391 | consider_profiling); |
be935610 | 2392 | |
9dcafc55 UD |
2393 | /* Add object to slot information data if necessasy. */ |
2394 | if (l->l_tls_blocksize != 0 && tls_init_tp_called) | |
a509eb11 | 2395 | _dl_add_to_slotinfo (l, true); |
164a7164 | 2396 | } |
1e372ded | 2397 | rtld_timer_stop (&relocate_time, start); |
164a7164 | 2398 | |
164a7164 UD |
2399 | /* Now enable profiling if needed. Like the previous call, |
2400 | this has to go here because the calls it makes should use the | |
2401 | rtld versions of the functions (particularly calloc()), but it | |
2402 | needs to have _dl_profile_map set up by the relocator. */ | |
a1ffb40e | 2403 | if (__glibc_unlikely (GL(dl_profile_map) != NULL)) |
164a7164 | 2404 | /* We must prepare the profiling. */ |
53bfdc1c | 2405 | _dl_start_profile (); |
164a7164 | 2406 | } |
ac16e905 | 2407 | |
d0503676 CD |
2408 | if ((!was_tls_init_tp_called && GL(dl_tls_max_dtv_idx) > 0) |
2409 | || count_modids != _dl_count_modids ()) | |
35f1e827 | 2410 | ++GL(dl_tls_generation); |
9dcafc55 | 2411 | |
35f1e827 UD |
2412 | /* Now that we have completed relocation, the initializer data |
2413 | for the TLS blocks has its final values and we can copy them | |
91ac3a7d TMQMF |
2414 | into the main thread's TLS area, which we allocated above. |
2415 | Note: thread-local variables must only be accessed after completing | |
2416 | the next step. */ | |
35f1e827 | 2417 | _dl_allocate_tls_init (tcbp); |
a334319f | 2418 | |
3d8c8bff | 2419 | /* And finally install it for the main thread. */ |
35f1e827 UD |
2420 | if (! tls_init_tp_called) |
2421 | { | |
774f9285 | 2422 | const char *lossage = TLS_INIT_TP (tcbp); |
a1ffb40e | 2423 | if (__glibc_unlikely (lossage != NULL)) |
35f1e827 UD |
2424 | _dl_fatal_printf ("cannot set up thread-local storage: %s\n", |
2425 | lossage); | |
90d7e7e5 | 2426 | __tls_init_tp (); |
0ecb606c | 2427 | } |
0ecb606c | 2428 | |
e23fe25b AS |
2429 | /* Make sure no new search directories have been added. */ |
2430 | assert (GLRO(dl_init_all_dirs) == GL(dl_all_dirs)); | |
bc5fb037 | 2431 | |
cafdfdb6 RM |
2432 | if (! prelinked && rtld_multiple_ref) |
2433 | { | |
2434 | /* There was an explicit ref to the dynamic linker as a shared lib. | |
2435 | Re-relocate ourselves with user-controlled symbol definitions. | |
2436 | ||
2437 | We must do this after TLS initialization in case after this | |
2438 | re-relocation, we might call a user-supplied function | |
2439 | (e.g. calloc from _dl_relocate_object) that uses TLS data. */ | |
2440 | ||
3a0ecccb FW |
2441 | /* The malloc implementation has been relocated, so resolving |
2442 | its symbols (and potentially calling IFUNC resolvers) is safe | |
2443 | at this point. */ | |
2444 | __rtld_malloc_init_real (main_map); | |
2445 | ||
d6163dfd FW |
2446 | /* Likewise for the locking implementation. */ |
2447 | __rtld_mutex_init (); | |
2448 | ||
1e372ded AZ |
2449 | RTLD_TIMING_VAR (start); |
2450 | rtld_timer_start (&start); | |
cafdfdb6 | 2451 | |
cafdfdb6 RM |
2452 | /* Mark the link map as not yet relocated again. */ |
2453 | GL(dl_rtld_map).l_relocated = 0; | |
c0a777e8 | 2454 | _dl_relocate_object (&GL(dl_rtld_map), main_map->l_scope, 0, 0); |
1e372ded AZ |
2455 | |
2456 | rtld_timer_accum (&relocate_time, start); | |
cafdfdb6 RM |
2457 | } |
2458 | ||
03e187a4 FW |
2459 | /* Relocation is complete. Perform early libc initialization. This |
2460 | is the initial libc, even if audit modules have been loaded with | |
2461 | other libcs. */ | |
2462 | _dl_call_libc_early_init (GL(dl_ns)[LM_ID_BASE].libc_map, true); | |
ec935dea | 2463 | |
bf8523c8 RM |
2464 | /* Do any necessary cleanups for the startup OS interface code. |
2465 | We do these now so that no calls are made after rtld re-relocation | |
2466 | which might be resolved to different functions than we expect. | |
2467 | We cannot do this before relocating the other objects because | |
2468 | _dl_relocate_object might need to call `mprotect' for DT_TEXTREL. */ | |
2469 | _dl_sysdep_start_cleanup (); | |
2470 | ||
9dcafc55 UD |
2471 | #ifdef SHARED |
2472 | /* Auditing checkpoint: we have added all objects. */ | |
a1ffb40e | 2473 | if (__glibc_unlikely (GLRO(dl_naudit) > 0)) |
9dcafc55 UD |
2474 | { |
2475 | struct link_map *head = GL(dl_ns)[LM_ID_BASE]._ns_loaded; | |
2476 | /* Do not call the functions for any auditing object. */ | |
2477 | if (head->l_auditing == 0) | |
2478 | { | |
2479 | struct audit_ifaces *afct = GLRO(dl_audit); | |
2480 | for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt) | |
2481 | { | |
2482 | if (afct->activity != NULL) | |
e1d559f3 FW |
2483 | afct->activity (&link_map_audit_state (head, cnt)->cookie, |
2484 | LA_ACT_CONSISTENT); | |
9dcafc55 UD |
2485 | |
2486 | afct = afct->next; | |
2487 | } | |
2488 | } | |
2489 | } | |
2490 | #endif | |
2491 | ||
2492 | /* Notify the debugger all new objects are now ready to go. We must re-get | |
2493 | the address since by now the variable might be in another object. */ | |
a93d9e03 | 2494 | r = _dl_debug_update (LM_ID_BASE); |
9dcafc55 | 2495 | r->r_state = RT_CONSISTENT; |
154d10bd | 2496 | _dl_debug_state (); |
815e6fa3 | 2497 | LIBC_PROBE (init_complete, 2, LM_ID_BASE, r); |
0200214b | 2498 | |
f57f8055 | 2499 | #if defined USE_LDCONFIG && !defined MAP_COPY |
08cac4ac | 2500 | /* We must munmap() the cache file. */ |
154d10bd | 2501 | _dl_unload_cache (); |
08cac4ac UD |
2502 | #endif |
2503 | ||
d66e34cd RM |
2504 | /* Once we return, _dl_sysdep_start will invoke |
2505 | the DT_INIT functions and then *USER_ENTRY. */ | |
2506 | } | |
fd26970f UD |
2507 | \f |
2508 | /* This is a little helper function for resolving symbols while | |
2509 | tracing the binary. */ | |
2510 | static void | |
c84142e8 UD |
2511 | print_unresolved (int errcode __attribute__ ((unused)), const char *objname, |
2512 | const char *errstring) | |
fd26970f | 2513 | { |
3996f34b | 2514 | if (objname[0] == '\0') |
b9375348 | 2515 | objname = RTLD_PROGNAME; |
35fc382a | 2516 | _dl_error_printf ("%s (%s)\n", errstring, objname); |
fd26970f | 2517 | } |
c84142e8 UD |
2518 | \f |
2519 | /* This is a little helper function for resolving symbols while | |
2520 | tracing the binary. */ | |
2521 | static void | |
2522 | print_missing_version (int errcode __attribute__ ((unused)), | |
2523 | const char *objname, const char *errstring) | |
2524 | { | |
b9375348 | 2525 | _dl_error_printf ("%s: %s: %s\n", RTLD_PROGNAME, |
35fc382a | 2526 | objname, errstring); |
c84142e8 | 2527 | } |
ea278354 | 2528 | \f |
b5efde2f UD |
2529 | /* Process the string given as the parameter which explains which debugging |
2530 | options are enabled. */ | |
2531 | static void | |
2bf9e641 | 2532 | process_dl_debug (struct dl_main_state *state, const char *dl_debug) |
b5efde2f | 2533 | { |
3e2040c8 UD |
2534 | /* When adding new entries make sure that the maximal length of a name |
2535 | is correctly handled in the LD_DEBUG_HELP code below. */ | |
2536 | static const struct | |
2537 | { | |
379d4ec4 UD |
2538 | unsigned char len; |
2539 | const char name[10]; | |
3e2040c8 UD |
2540 | const char helptext[41]; |
2541 | unsigned short int mask; | |
2542 | } debopts[] = | |
2543 | { | |
379d4ec4 UD |
2544 | #define LEN_AND_STR(str) sizeof (str) - 1, str |
2545 | { LEN_AND_STR ("libs"), "display library search paths", | |
3e2040c8 | 2546 | DL_DEBUG_LIBS | DL_DEBUG_IMPCALLS }, |
379d4ec4 | 2547 | { LEN_AND_STR ("reloc"), "display relocation processing", |
3e2040c8 | 2548 | DL_DEBUG_RELOC | DL_DEBUG_IMPCALLS }, |
379d4ec4 | 2549 | { LEN_AND_STR ("files"), "display progress for input file", |
3e2040c8 | 2550 | DL_DEBUG_FILES | DL_DEBUG_IMPCALLS }, |
379d4ec4 | 2551 | { LEN_AND_STR ("symbols"), "display symbol table processing", |
3e2040c8 | 2552 | DL_DEBUG_SYMBOLS | DL_DEBUG_IMPCALLS }, |
379d4ec4 | 2553 | { LEN_AND_STR ("bindings"), "display information about symbol binding", |
3e2040c8 | 2554 | DL_DEBUG_BINDINGS | DL_DEBUG_IMPCALLS }, |
379d4ec4 | 2555 | { LEN_AND_STR ("versions"), "display version dependencies", |
3e2040c8 | 2556 | DL_DEBUG_VERSIONS | DL_DEBUG_IMPCALLS }, |
73d7af4f UD |
2557 | { LEN_AND_STR ("scopes"), "display scope information", |
2558 | DL_DEBUG_SCOPES }, | |
379d4ec4 | 2559 | { LEN_AND_STR ("all"), "all previous options combined", |
3e2040c8 | 2560 | DL_DEBUG_LIBS | DL_DEBUG_RELOC | DL_DEBUG_FILES | DL_DEBUG_SYMBOLS |
73d7af4f UD |
2561 | | DL_DEBUG_BINDINGS | DL_DEBUG_VERSIONS | DL_DEBUG_IMPCALLS |
2562 | | DL_DEBUG_SCOPES }, | |
379d4ec4 | 2563 | { LEN_AND_STR ("statistics"), "display relocation statistics", |
3e2040c8 | 2564 | DL_DEBUG_STATISTICS }, |
7a11603d UD |
2565 | { LEN_AND_STR ("unused"), "determined unused DSOs", |
2566 | DL_DEBUG_UNUSED }, | |
379d4ec4 | 2567 | { LEN_AND_STR ("help"), "display this help message and exit", |
3e2040c8 UD |
2568 | DL_DEBUG_HELP }, |
2569 | }; | |
2570 | #define ndebopts (sizeof (debopts) / sizeof (debopts[0])) | |
3e2040c8 | 2571 | |
379d4ec4 UD |
2572 | /* Skip separating white spaces and commas. */ |
2573 | while (*dl_debug != '\0') | |
b5efde2f | 2574 | { |
379d4ec4 | 2575 | if (*dl_debug != ' ' && *dl_debug != ',' && *dl_debug != ':') |
b5efde2f | 2576 | { |
3e2040c8 | 2577 | size_t cnt; |
379d4ec4 | 2578 | size_t len = 1; |
77aba05b | 2579 | |
379d4ec4 UD |
2580 | while (dl_debug[len] != '\0' && dl_debug[len] != ' ' |
2581 | && dl_debug[len] != ',' && dl_debug[len] != ':') | |
2582 | ++len; | |
14c44e2e | 2583 | |
3e2040c8 | 2584 | for (cnt = 0; cnt < ndebopts; ++cnt) |
379d4ec4 UD |
2585 | if (debopts[cnt].len == len |
2586 | && memcmp (dl_debug, debopts[cnt].name, len) == 0) | |
3e2040c8 | 2587 | { |
afdca0f2 | 2588 | GLRO(dl_debug_mask) |= debopts[cnt].mask; |
2bf9e641 | 2589 | state->any_debug = true; |
3e2040c8 UD |
2590 | break; |
2591 | } | |
77aba05b | 2592 | |
3e2040c8 UD |
2593 | if (cnt == ndebopts) |
2594 | { | |
2595 | /* Display a warning and skip everything until next | |
2596 | separator. */ | |
2597 | char *copy = strndupa (dl_debug, len); | |
2598 | _dl_error_printf ("\ | |
2599 | warning: debug option `%s' unknown; try LD_DEBUG=help\n", copy); | |
379d4ec4 UD |
2600 | } |
2601 | ||
2602 | dl_debug += len; | |
2603 | continue; | |
3e2040c8 | 2604 | } |
379d4ec4 UD |
2605 | |
2606 | ++dl_debug; | |
3e2040c8 | 2607 | } |
77aba05b | 2608 | |
ff9f1c5f DM |
2609 | if (GLRO(dl_debug_mask) & DL_DEBUG_UNUSED) |
2610 | { | |
2611 | /* In order to get an accurate picture of whether a particular | |
2612 | DT_NEEDED entry is actually used we have to process both | |
2613 | the PLT and non-PLT relocation entries. */ | |
2614 | GLRO(dl_lazy) = 0; | |
2615 | } | |
2616 | ||
afdca0f2 | 2617 | if (GLRO(dl_debug_mask) & DL_DEBUG_HELP) |
3e2040c8 UD |
2618 | { |
2619 | size_t cnt; | |
14c44e2e | 2620 | |
3e2040c8 UD |
2621 | _dl_printf ("\ |
2622 | Valid options for the LD_DEBUG environment variable are:\n\n"); | |
db276fa1 | 2623 | |
3e2040c8 | 2624 | for (cnt = 0; cnt < ndebopts; ++cnt) |
37d8b778 UD |
2625 | _dl_printf (" %.*s%s%s\n", debopts[cnt].len, debopts[cnt].name, |
2626 | " " + debopts[cnt].len - 3, | |
3e2040c8 | 2627 | debopts[cnt].helptext); |
14c44e2e | 2628 | |
3e2040c8 UD |
2629 | _dl_printf ("\n\ |
2630 | To direct the debugging output into a file instead of standard output\n\ | |
2631 | a filename can be specified using the LD_DEBUG_OUTPUT environment variable.\n"); | |
2632 | _exit (0); | |
b5efde2f | 2633 | } |
b5efde2f UD |
2634 | } |
2635 | \f | |
ea278354 | 2636 | static void |
2bf9e641 | 2637 | process_envvars (struct dl_main_state *state) |
ea278354 | 2638 | { |
67c94753 | 2639 | char **runp = _environ; |
ea278354 | 2640 | char *envline; |
7dea968e | 2641 | char *debug_output = NULL; |
ea278354 UD |
2642 | |
2643 | /* This is the default place for profiling data file. */ | |
afdca0f2 | 2644 | GLRO(dl_profile_output) |
6bc6bd3b | 2645 | = &"/var/tmp\0/var/profile"[__libc_enable_secure ? 9 : 0]; |
ea278354 UD |
2646 | |
2647 | while ((envline = _dl_next_ld_env_entry (&runp)) != NULL) | |
2648 | { | |
379d4ec4 UD |
2649 | size_t len = 0; |
2650 | ||
2651 | while (envline[len] != '\0' && envline[len] != '=') | |
2652 | ++len; | |
ea278354 | 2653 | |
75e8d1f5 UD |
2654 | if (envline[len] != '=') |
2655 | /* This is a "LD_" variable at the end of the string without | |
2656 | a '=' character. Ignore it since otherwise we will access | |
2657 | invalid memory below. */ | |
67c94753 | 2658 | continue; |
75e8d1f5 | 2659 | |
67c94753 | 2660 | switch (len) |
ea278354 | 2661 | { |
14c44e2e UD |
2662 | case 4: |
2663 | /* Warning level, verbose or not. */ | |
67c94753 | 2664 | if (memcmp (envline, "WARN", 4) == 0) |
afdca0f2 | 2665 | GLRO(dl_verbose) = envline[5] != '\0'; |
14c44e2e | 2666 | break; |
ea278354 | 2667 | |
14c44e2e UD |
2668 | case 5: |
2669 | /* Debugging of the dynamic linker? */ | |
67c94753 | 2670 | if (memcmp (envline, "DEBUG", 5) == 0) |
9dcafc55 | 2671 | { |
2bf9e641 | 2672 | process_dl_debug (state, &envline[6]); |
9dcafc55 UD |
2673 | break; |
2674 | } | |
2675 | if (memcmp (envline, "AUDIT", 5) == 0) | |
2bf9e641 | 2676 | audit_list_add_string (&state->audit_list, &envline[6]); |
14c44e2e | 2677 | break; |
b5efde2f | 2678 | |
14c44e2e UD |
2679 | case 7: |
2680 | /* Print information about versions. */ | |
67c94753 | 2681 | if (memcmp (envline, "VERBOSE", 7) == 0) |
14c44e2e | 2682 | { |
2bf9e641 | 2683 | state->version_info = envline[8] != '\0'; |
14c44e2e UD |
2684 | break; |
2685 | } | |
7dea968e | 2686 | |
14c44e2e | 2687 | /* List of objects to be preloaded. */ |
67c94753 | 2688 | if (memcmp (envline, "PRELOAD", 7) == 0) |
14c44e2e | 2689 | { |
2bf9e641 | 2690 | state->preloadlist = &envline[8]; |
14c44e2e UD |
2691 | break; |
2692 | } | |
120b4c49 | 2693 | |
14c44e2e | 2694 | /* Which shared object shall be profiled. */ |
c95f3fd4 | 2695 | if (memcmp (envline, "PROFILE", 7) == 0 && envline[8] != '\0') |
afdca0f2 | 2696 | GLRO(dl_profile) = &envline[8]; |
14c44e2e | 2697 | break; |
120b4c49 | 2698 | |
14c44e2e UD |
2699 | case 8: |
2700 | /* Do we bind early? */ | |
67c94753 | 2701 | if (memcmp (envline, "BIND_NOW", 8) == 0) |
f53c03c2 | 2702 | { |
afdca0f2 | 2703 | GLRO(dl_lazy) = envline[9] == '\0'; |
f53c03c2 UD |
2704 | break; |
2705 | } | |
67c94753 | 2706 | if (memcmp (envline, "BIND_NOT", 8) == 0) |
afdca0f2 | 2707 | GLRO(dl_bind_not) = envline[9] != '\0'; |
14c44e2e | 2708 | break; |
ea278354 | 2709 | |
14c44e2e UD |
2710 | case 9: |
2711 | /* Test whether we want to see the content of the auxiliary | |
2712 | array passed up from the kernel. */ | |
6bc6bd3b | 2713 | if (!__libc_enable_secure |
00a12162 | 2714 | && memcmp (envline, "SHOW_AUXV", 9) == 0) |
14c44e2e UD |
2715 | _dl_show_auxv (); |
2716 | break; | |
ea278354 | 2717 | |
ff08fc59 | 2718 | #if !HAVE_TUNABLES |
12264bd7 | 2719 | case 10: |
3081378b | 2720 | /* Mask for the important hardware capabilities. */ |
1c1243b6 SP |
2721 | if (!__libc_enable_secure |
2722 | && memcmp (envline, "HWCAP_MASK", 10) == 0) | |
37b66c0b | 2723 | GLRO(dl_hwcap_mask) = _dl_strtoul (&envline[11], NULL); |
12264bd7 | 2724 | break; |
ff08fc59 | 2725 | #endif |
12264bd7 | 2726 | |
f787edde UD |
2727 | case 11: |
2728 | /* Path where the binary is found. */ | |
6bc6bd3b | 2729 | if (!__libc_enable_secure |
67c94753 | 2730 | && memcmp (envline, "ORIGIN_PATH", 11) == 0) |
afdca0f2 | 2731 | GLRO(dl_origin_path) = &envline[12]; |
f787edde UD |
2732 | break; |
2733 | ||
14c44e2e | 2734 | case 12: |
dec126b4 | 2735 | /* The library search path. */ |
f6110a8f FW |
2736 | if (!__libc_enable_secure |
2737 | && memcmp (envline, "LIBRARY_PATH", 12) == 0) | |
dec126b4 | 2738 | { |
2bf9e641 | 2739 | state->library_path = &envline[13]; |
27316f4a | 2740 | state->library_path_source = "LD_LIBRARY_PATH"; |
dec126b4 UD |
2741 | break; |
2742 | } | |
2743 | ||
14c44e2e | 2744 | /* Where to place the profiling data file. */ |
67c94753 | 2745 | if (memcmp (envline, "DEBUG_OUTPUT", 12) == 0) |
14c44e2e | 2746 | { |
67c94753 | 2747 | debug_output = &envline[13]; |
14c44e2e UD |
2748 | break; |
2749 | } | |
ea278354 | 2750 | |
6bc6bd3b | 2751 | if (!__libc_enable_secure |
00a12162 | 2752 | && memcmp (envline, "DYNAMIC_WEAK", 12) == 0) |
afdca0f2 | 2753 | GLRO(dl_dynamic_weak) = 1; |
14c44e2e | 2754 | break; |
ea278354 | 2755 | |
97fd3a30 UD |
2756 | case 13: |
2757 | /* We might have some extra environment variable with length 13 | |
2758 | to handle. */ | |
2759 | #ifdef EXTRA_LD_ENVVARS_13 | |
2760 | EXTRA_LD_ENVVARS_13 | |
2761 | #endif | |
6bc6bd3b | 2762 | if (!__libc_enable_secure |
97fd3a30 | 2763 | && memcmp (envline, "USE_LOAD_BIAS", 13) == 0) |
827b7087 UD |
2764 | { |
2765 | GLRO(dl_use_load_bias) = envline[14] == '1' ? -1 : 0; | |
2766 | break; | |
2767 | } | |
97fd3a30 UD |
2768 | break; |
2769 | ||
14c44e2e UD |
2770 | case 14: |
2771 | /* Where to place the profiling data file. */ | |
6bc6bd3b | 2772 | if (!__libc_enable_secure |
3e2040c8 UD |
2773 | && memcmp (envline, "PROFILE_OUTPUT", 14) == 0 |
2774 | && envline[15] != '\0') | |
afdca0f2 | 2775 | GLRO(dl_profile_output) = &envline[15]; |
14c44e2e | 2776 | break; |
120b4c49 | 2777 | |
32e6df36 UD |
2778 | case 16: |
2779 | /* The mode of the dynamic linker can be set. */ | |
2780 | if (memcmp (envline, "TRACE_PRELINKING", 16) == 0) | |
2781 | { | |
2bf9e641 | 2782 | state->mode = rtld_mode_trace; |
afdca0f2 UD |
2783 | GLRO(dl_verbose) = 1; |
2784 | GLRO(dl_debug_mask) |= DL_DEBUG_PRELINK; | |
2785 | GLRO(dl_trace_prelink) = &envline[17]; | |
32e6df36 UD |
2786 | } |
2787 | break; | |
2788 | ||
14c44e2e UD |
2789 | case 20: |
2790 | /* The mode of the dynamic linker can be set. */ | |
67c94753 | 2791 | if (memcmp (envline, "TRACE_LOADED_OBJECTS", 20) == 0) |
2bf9e641 | 2792 | state->mode = rtld_mode_trace; |
14c44e2e | 2793 | break; |
e2102c14 UD |
2794 | |
2795 | /* We might have some extra environment variable to handle. This | |
2796 | is tricky due to the pre-processing of the length of the name | |
2797 | in the switch statement here. The code here assumes that added | |
2798 | environment variables have a different length. */ | |
2799 | #ifdef EXTRA_LD_ENVVARS | |
2800 | EXTRA_LD_ENVVARS | |
2801 | #endif | |
ea278354 UD |
2802 | } |
2803 | } | |
2804 | ||
4bae5567 UD |
2805 | /* Extra security for SUID binaries. Remove all dangerous environment |
2806 | variables. */ | |
6bc6bd3b | 2807 | if (__builtin_expect (__libc_enable_secure, 0)) |
4bae5567 | 2808 | { |
c95f3fd4 | 2809 | static const char unsecure_envvars[] = |
4bae5567 UD |
2810 | #ifdef EXTRA_UNSECURE_ENVVARS |
2811 | EXTRA_UNSECURE_ENVVARS | |
2812 | #endif | |
c95f3fd4 UD |
2813 | UNSECURE_ENVVARS; |
2814 | const char *nextp; | |
2815 | ||
2816 | nextp = unsecure_envvars; | |
2817 | do | |
2818 | { | |
2819 | unsetenv (nextp); | |
9710f75d UD |
2820 | /* We could use rawmemchr but this need not be fast. */ |
2821 | nextp = (char *) (strchr) (nextp, '\0') + 1; | |
c95f3fd4 UD |
2822 | } |
2823 | while (*nextp != '\0'); | |
74955460 UD |
2824 | |
2825 | if (__access ("/etc/suid-debug", F_OK) != 0) | |
3a56ea26 | 2826 | { |
67e58f39 | 2827 | #if !HAVE_TUNABLES |
00a12162 | 2828 | unsetenv ("MALLOC_CHECK_"); |
67e58f39 | 2829 | #endif |
f57a3c94 | 2830 | GLRO(dl_debug_mask) = 0; |
3a56ea26 | 2831 | } |
f57a3c94 | 2832 | |
2bf9e641 | 2833 | if (state->mode != rtld_mode_normal) |
f57a3c94 | 2834 | _exit (5); |
4bae5567 | 2835 | } |
7dea968e UD |
2836 | /* If we have to run the dynamic linker in debugging mode and the |
2837 | LD_DEBUG_OUTPUT environment variable is given, we write the debug | |
2838 | messages to this file. */ | |
2bf9e641 | 2839 | else if (state->any_debug && debug_output != NULL) |
7dea968e | 2840 | { |
5f2de337 | 2841 | const int flags = O_WRONLY | O_APPEND | O_CREAT | O_NOFOLLOW; |
7a2fd787 UD |
2842 | size_t name_len = strlen (debug_output); |
2843 | char buf[name_len + 12]; | |
2844 | char *startp; | |
2845 | ||
2846 | buf[name_len + 11] = '\0'; | |
9710f75d | 2847 | startp = _itoa (__getpid (), &buf[name_len + 11], 10, 0); |
7a2fd787 UD |
2848 | *--startp = '.'; |
2849 | startp = memcpy (startp - name_len, debug_output, name_len); | |
2850 | ||
329ea513 | 2851 | GLRO(dl_debug_fd) = __open64_nocancel (startp, flags, DEFFILEMODE); |
dd70526e | 2852 | if (GLRO(dl_debug_fd) == -1) |
7dea968e | 2853 | /* We use standard output if opening the file failed. */ |
dd70526e | 2854 | GLRO(dl_debug_fd) = STDOUT_FILENO; |
7dea968e | 2855 | } |
ea278354 | 2856 | } |
db276fa1 | 2857 | |
1e372ded AZ |
2858 | #if HP_TIMING_INLINE |
2859 | static void | |
2860 | print_statistics_item (const char *title, hp_timing_t time, | |
2861 | hp_timing_t total) | |
2862 | { | |
2863 | char cycles[HP_TIMING_PRINT_SIZE]; | |
2864 | HP_TIMING_PRINT (cycles, sizeof (cycles), time); | |
2865 | ||
2866 | char relative[3 * sizeof (hp_timing_t) + 2]; | |
2867 | char *cp = _itoa ((1000ULL * time) / total, relative + sizeof (relative), | |
2868 | 10, 0); | |
2869 | /* Sets the decimal point. */ | |
2870 | char *wp = relative; | |
2871 | switch (relative + sizeof (relative) - cp) | |
2872 | { | |
2873 | case 3: | |
2874 | *wp++ = *cp++; | |
2875 | /* Fall through. */ | |
2876 | case 2: | |
2877 | *wp++ = *cp++; | |
2878 | /* Fall through. */ | |
2879 | case 1: | |
2880 | *wp++ = '.'; | |
2881 | *wp++ = *cp++; | |
2882 | } | |
2883 | *wp = '\0'; | |
2884 | _dl_debug_printf ("%s: %s cycles (%s%%)\n", title, cycles, relative); | |
2885 | } | |
2886 | #endif | |
db276fa1 UD |
2887 | |
2888 | /* Print the various times we collected. */ | |
2889 | static void | |
ee600e3f | 2890 | __attribute ((noinline)) |
1e372ded | 2891 | print_statistics (const hp_timing_t *rtld_total_timep) |
db276fa1 | 2892 | { |
1e372ded AZ |
2893 | #if HP_TIMING_INLINE |
2894 | { | |
2895 | char cycles[HP_TIMING_PRINT_SIZE]; | |
2896 | HP_TIMING_PRINT (cycles, sizeof (cycles), *rtld_total_timep); | |
2897 | _dl_debug_printf ("\nruntime linker statistics:\n" | |
2898 | " total startup time in dynamic loader: %s cycles\n", | |
2899 | cycles); | |
2900 | print_statistics_item (" time needed for relocation", | |
2901 | relocate_time, *rtld_total_timep); | |
2902 | } | |
1531e094 | 2903 | #endif |
a21a20a3 UD |
2904 | |
2905 | unsigned long int num_relative_relocations = 0; | |
22c83193 | 2906 | for (Lmid_t ns = 0; ns < GL(dl_nns); ++ns) |
a21a20a3 | 2907 | { |
c120d94d UD |
2908 | if (GL(dl_ns)[ns]._ns_loaded == NULL) |
2909 | continue; | |
2910 | ||
c0f62c56 | 2911 | struct r_scope_elem *scope = &GL(dl_ns)[ns]._ns_loaded->l_searchlist; |
a21a20a3 | 2912 | |
c0f62c56 UD |
2913 | for (unsigned int i = 0; i < scope->r_nlist; i++) |
2914 | { | |
2915 | struct link_map *l = scope->r_list [i]; | |
2916 | ||
c120d94d | 2917 | if (l->l_addr != 0 && l->l_info[VERSYMIDX (DT_RELCOUNT)]) |
c0f62c56 UD |
2918 | num_relative_relocations |
2919 | += l->l_info[VERSYMIDX (DT_RELCOUNT)]->d_un.d_val; | |
c120d94d UD |
2920 | #ifndef ELF_MACHINE_REL_RELATIVE |
2921 | /* Relative relocations are processed on these architectures if | |
2922 | library is loaded to different address than p_vaddr or | |
2923 | if not prelinked. */ | |
2924 | if ((l->l_addr != 0 || !l->l_info[VALIDX(DT_GNU_PRELINKED)]) | |
2925 | && l->l_info[VERSYMIDX (DT_RELACOUNT)]) | |
2926 | #else | |
2927 | /* On e.g. IA-64 or Alpha, relative relocations are processed | |
2928 | only if library is loaded to different address than p_vaddr. */ | |
2929 | if (l->l_addr != 0 && l->l_info[VERSYMIDX (DT_RELACOUNT)]) | |
2930 | #endif | |
c0f62c56 UD |
2931 | num_relative_relocations |
2932 | += l->l_info[VERSYMIDX (DT_RELACOUNT)]->d_un.d_val; | |
2933 | } | |
a21a20a3 UD |
2934 | } |
2935 | ||
42af49f8 UD |
2936 | _dl_debug_printf (" number of relocations: %lu\n" |
2937 | " number of relocations from cache: %lu\n" | |
2938 | " number of relative relocations: %lu\n", | |
2939 | GL(dl_num_relocations), | |
2940 | GL(dl_num_cache_relocations), | |
154d10bd | 2941 | num_relative_relocations); |
db276fa1 | 2942 | |
1e372ded AZ |
2943 | #if HP_TIMING_INLINE |
2944 | print_statistics_item (" time needed to load objects", | |
2945 | load_time, *rtld_total_timep); | |
1531e094 | 2946 | #endif |
db276fa1 | 2947 | } |