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d66e34cd | 1 | /* Run time dynamic linker. |
581c785b | 2 | Copyright (C) 1995-2022 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> |
c1cb2dee | 53 | #include <dl-execve.h> |
5d28a896 | 54 | #include <dl-find_object.h> |
f5348425 | 55 | |
a853022c | 56 | #include <assert.h> |
f5348425 | 57 | |
d6d89608 AZ |
58 | /* This #define produces dynamic linking inline functions for |
59 | bootstrap relocation instead of general-purpose relocation. | |
60 | Since ld.so must not have any undefined symbols the result | |
61 | is trivial: always the map of ld.so itself. */ | |
62 | #define RTLD_BOOTSTRAP | |
63 | #define RESOLVE_MAP(map, scope, sym, version, flags) map | |
64 | #include "dynamic-link.h" | |
65 | ||
1e372ded AZ |
66 | /* Only enables rtld profiling for architectures which provides non generic |
67 | hp-timing support. The generic support requires either syscall | |
68 | (clock_gettime), which will incur in extra overhead on loading time. | |
69 | Using vDSO is also an option, but it will require extra support on loader | |
70 | to setup the vDSO pointer before its usage. */ | |
71 | #if HP_TIMING_INLINE | |
72 | # define RLTD_TIMING_DECLARE(var, classifier,...) \ | |
73 | classifier hp_timing_t var __VA_ARGS__ | |
74 | # define RTLD_TIMING_VAR(var) RLTD_TIMING_DECLARE (var, ) | |
75 | # define RTLD_TIMING_SET(var, value) (var) = (value) | |
76 | # define RTLD_TIMING_REF(var) &(var) | |
77 | ||
78 | static inline void | |
79 | rtld_timer_start (hp_timing_t *var) | |
80 | { | |
81 | HP_TIMING_NOW (*var); | |
82 | } | |
83 | ||
84 | static inline void | |
85 | rtld_timer_stop (hp_timing_t *var, hp_timing_t start) | |
86 | { | |
87 | hp_timing_t stop; | |
88 | HP_TIMING_NOW (stop); | |
89 | HP_TIMING_DIFF (*var, start, stop); | |
90 | } | |
91 | ||
92 | static inline void | |
93 | rtld_timer_accum (hp_timing_t *sum, hp_timing_t start) | |
94 | { | |
95 | hp_timing_t stop; | |
96 | rtld_timer_stop (&stop, start); | |
97 | HP_TIMING_ACCUM_NT(*sum, stop); | |
98 | } | |
99 | #else | |
100 | # define RLTD_TIMING_DECLARE(var, classifier...) | |
101 | # define RTLD_TIMING_SET(var, value) | |
102 | # define RTLD_TIMING_VAR(var) | |
103 | # define RTLD_TIMING_REF(var) 0 | |
104 | # define rtld_timer_start(var) | |
105 | # define rtld_timer_stop(var, start) | |
106 | # define rtld_timer_accum(sum, start) | |
107 | #endif | |
108 | ||
6ce3881d RM |
109 | /* Avoid PLT use for our local calls at startup. */ |
110 | extern __typeof (__mempcpy) __mempcpy attribute_hidden; | |
111 | ||
112 | /* GCC has mental blocks about _exit. */ | |
113 | extern __typeof (_exit) exit_internal asm ("_exit") attribute_hidden; | |
114 | #define _exit exit_internal | |
115 | ||
fd26970f | 116 | /* Helper function to handle errors while resolving symbols. */ |
c84142e8 UD |
117 | static void print_unresolved (int errcode, const char *objname, |
118 | const char *errsting); | |
119 | ||
120 | /* Helper function to handle errors when a version is missing. */ | |
121 | static void print_missing_version (int errcode, const char *objname, | |
122 | const char *errsting); | |
fd26970f | 123 | |
db276fa1 | 124 | /* Print the various times we collected. */ |
1e372ded | 125 | static void print_statistics (const hp_timing_t *total_timep); |
ea278354 | 126 | |
4c6e0415 FW |
127 | /* Creates an empty audit list. */ |
128 | static void audit_list_init (struct audit_list *); | |
129 | ||
130 | /* Add a string to the end of the audit list, for later parsing. Must | |
131 | not be called after audit_list_next. */ | |
132 | static void audit_list_add_string (struct audit_list *, const char *); | |
133 | ||
8f7a75d7 FW |
134 | /* Add the audit strings from the link map, found in the dynamic |
135 | segment at TG (either DT_AUDIT and DT_DEPAUDIT). Must be called | |
136 | before audit_list_next. */ | |
137 | static void audit_list_add_dynamic_tag (struct audit_list *, | |
138 | struct link_map *, | |
139 | unsigned int tag); | |
140 | ||
4c6e0415 FW |
141 | /* Extract the next audit module from the audit list. Only modules |
142 | for which dso_name_valid_for_suid is true are returned. Must be | |
8f7a75d7 FW |
143 | called after all the audit_list_add_string, |
144 | audit_list_add_dynamic_tags calls. */ | |
4c6e0415 | 145 | static const char *audit_list_next (struct audit_list *); |
74780cf6 | 146 | |
2bf9e641 FW |
147 | /* Initialize *STATE with the defaults. */ |
148 | static void dl_main_state_init (struct dl_main_state *state); | |
ea278354 UD |
149 | |
150 | /* Process all environments variables the dynamic linker must recognize. | |
151 | Since all of them start with `LD_' we are a bit smarter while finding | |
152 | all the entries. */ | |
851f32cf | 153 | extern char **_environ attribute_hidden; |
2bf9e641 | 154 | static void process_envvars (struct dl_main_state *state); |
ea278354 | 155 | |
11986c68 | 156 | #ifdef DL_ARGV_NOT_RELRO |
22aa06a5 | 157 | int _dl_argc attribute_hidden; |
11986c68 | 158 | char **_dl_argv = NULL; |
22aa06a5 RM |
159 | /* Nonzero if we were run directly. */ |
160 | unsigned int _dl_skip_args attribute_hidden; | |
11986c68 | 161 | #else |
22aa06a5 | 162 | int _dl_argc attribute_relro attribute_hidden; |
697afbe1 | 163 | char **_dl_argv attribute_relro = NULL; |
22aa06a5 | 164 | unsigned int _dl_skip_args attribute_relro attribute_hidden; |
11986c68 | 165 | #endif |
4243cbea | 166 | rtld_hidden_data_def (_dl_argv) |
5c82e15e | 167 | |
35f1e827 UD |
168 | #ifndef THREAD_SET_STACK_GUARD |
169 | /* Only exported for architectures that don't store the stack guard canary | |
170 | in thread local area. */ | |
171 | uintptr_t __stack_chk_guard attribute_relro; | |
172 | #endif | |
173 | ||
827b7087 UD |
174 | /* Only exported for architectures that don't store the pointer guard |
175 | value in thread local area. */ | |
7c241325 | 176 | uintptr_t __pointer_chk_guard_local attribute_relro attribute_hidden; |
827b7087 UD |
177 | #ifndef THREAD_SET_POINTER_GUARD |
178 | strong_alias (__pointer_chk_guard_local, __pointer_chk_guard) | |
179 | #endif | |
180 | ||
6d0ba622 FW |
181 | /* Check that AT_SECURE=0, or that the passed name does not contain |
182 | directories and is not overly long. Reject empty names | |
183 | unconditionally. */ | |
184 | static bool | |
185 | dso_name_valid_for_suid (const char *p) | |
186 | { | |
187 | if (__glibc_unlikely (__libc_enable_secure)) | |
188 | { | |
189 | /* Ignore pathnames with directories for AT_SECURE=1 | |
190 | programs, and also skip overlong names. */ | |
191 | size_t len = strlen (p); | |
192 | if (len >= SECURE_NAME_LIMIT || memchr (p, '/', len) != NULL) | |
193 | return false; | |
194 | } | |
195 | return *p != '\0'; | |
196 | } | |
827b7087 | 197 | |
4c6e0415 FW |
198 | static void |
199 | audit_list_init (struct audit_list *list) | |
9dcafc55 | 200 | { |
4c6e0415 FW |
201 | list->length = 0; |
202 | list->current_index = 0; | |
203 | list->current_tail = NULL; | |
204 | } | |
9dcafc55 | 205 | |
4c6e0415 FW |
206 | static void |
207 | audit_list_add_string (struct audit_list *list, const char *string) | |
81b82fb9 | 208 | { |
4c6e0415 FW |
209 | /* Empty strings do not load anything. */ |
210 | if (*string == '\0') | |
211 | return; | |
81b82fb9 | 212 | |
4c6e0415 FW |
213 | if (list->length == array_length (list->audit_strings)) |
214 | _dl_fatal_printf ("Fatal glibc error: Too many audit modules requested\n"); | |
81b82fb9 | 215 | |
4c6e0415 | 216 | list->audit_strings[list->length++] = string; |
81b82fb9 | 217 | |
4c6e0415 FW |
218 | /* Initialize processing of the first string for |
219 | audit_list_next. */ | |
220 | if (list->length == 1) | |
221 | list->current_tail = string; | |
81b82fb9 FW |
222 | } |
223 | ||
8f7a75d7 FW |
224 | static void |
225 | audit_list_add_dynamic_tag (struct audit_list *list, struct link_map *main_map, | |
226 | unsigned int tag) | |
227 | { | |
228 | ElfW(Dyn) *info = main_map->l_info[ADDRIDX (tag)]; | |
229 | const char *strtab = (const char *) D_PTR (main_map, l_info[DT_STRTAB]); | |
230 | if (info != NULL) | |
231 | audit_list_add_string (list, strtab + info->d_un.d_val); | |
232 | } | |
233 | ||
81b82fb9 | 234 | static const char * |
4c6e0415 | 235 | audit_list_next (struct audit_list *list) |
81b82fb9 | 236 | { |
4c6e0415 FW |
237 | if (list->current_tail == NULL) |
238 | return NULL; | |
239 | ||
240 | while (true) | |
81b82fb9 | 241 | { |
4c6e0415 FW |
242 | /* Advance to the next string in audit_strings if the current |
243 | string has been exhausted. */ | |
244 | while (*list->current_tail == '\0') | |
81b82fb9 | 245 | { |
4c6e0415 FW |
246 | ++list->current_index; |
247 | if (list->current_index == list->length) | |
81b82fb9 | 248 | { |
4c6e0415 FW |
249 | list->current_tail = NULL; |
250 | return NULL; | |
81b82fb9 | 251 | } |
4c6e0415 | 252 | list->current_tail = list->audit_strings[list->current_index]; |
81b82fb9 | 253 | } |
81b82fb9 | 254 | |
4c6e0415 FW |
255 | /* Split the in-string audit list at the next colon colon. */ |
256 | size_t len = strcspn (list->current_tail, ":"); | |
257 | if (len > 0 && len < sizeof (list->fname)) | |
258 | { | |
259 | memcpy (list->fname, list->current_tail, len); | |
260 | list->fname[len] = '\0'; | |
261 | } | |
262 | else | |
263 | /* Mark the name as unusable for dso_name_valid_for_suid. */ | |
264 | list->fname[0] = '\0'; | |
265 | ||
266 | /* Skip over the substring and the following delimiter. */ | |
267 | list->current_tail += len; | |
268 | if (*list->current_tail == ':') | |
269 | ++list->current_tail; | |
270 | ||
271 | /* If the name is valid, return it. */ | |
272 | if (dso_name_valid_for_suid (list->fname)) | |
273 | return list->fname; | |
274 | ||
275 | /* Otherwise wrap around to find the next list element. . */ | |
81b82fb9 | 276 | } |
81b82fb9 FW |
277 | } |
278 | ||
17796419 SN |
279 | /* Count audit modules before they are loaded so GLRO(dl_naudit) |
280 | is not yet usable. */ | |
281 | static size_t | |
282 | audit_list_count (struct audit_list *list) | |
283 | { | |
284 | /* Restore the audit_list iterator state at the end. */ | |
285 | const char *saved_tail = list->current_tail; | |
286 | size_t naudit = 0; | |
287 | ||
288 | assert (list->current_index == 0); | |
289 | while (audit_list_next (list) != NULL) | |
290 | naudit++; | |
291 | list->current_tail = saved_tail; | |
292 | list->current_index = 0; | |
293 | return naudit; | |
294 | } | |
295 | ||
2bf9e641 FW |
296 | static void |
297 | dl_main_state_init (struct dl_main_state *state) | |
298 | { | |
299 | audit_list_init (&state->audit_list); | |
300 | state->library_path = NULL; | |
27316f4a | 301 | state->library_path_source = NULL; |
2bf9e641 FW |
302 | state->preloadlist = NULL; |
303 | state->preloadarg = NULL; | |
dad90d52 FW |
304 | state->glibc_hwcaps_prepend = NULL; |
305 | state->glibc_hwcaps_mask = NULL; | |
2bf9e641 FW |
306 | state->mode = rtld_mode_normal; |
307 | state->any_debug = false; | |
308 | state->version_info = false; | |
309 | } | |
310 | ||
ce6e047f | 311 | #ifndef HAVE_INLINED_SYSCALLS |
39778c6c UD |
312 | /* Set nonzero during loading and initialization of executable and |
313 | libraries, cleared before the executable's entry point runs. This | |
314 | must not be initialized to nonzero, because the unused dynamic | |
315 | linker loaded in for libc.so's "ld.so.1" dep will provide the | |
316 | definition seen by libc.so's initializer; that value must be zero, | |
317 | and will be since that dynamic linker's _dl_start and dl_main will | |
318 | never be called. */ | |
e6caf4e1 | 319 | int _dl_starting_up = 0; |
9cf27b8d | 320 | rtld_hidden_def (_dl_starting_up) |
ce6e047f | 321 | #endif |
39778c6c | 322 | |
d6b5d570 UD |
323 | /* This is the structure which defines all variables global to ld.so |
324 | (except those which cannot be added for some reason). */ | |
5688da55 UD |
325 | struct rtld_global _rtld_global = |
326 | { | |
674ea882 L |
327 | /* Get architecture specific initializer. */ |
328 | #include <dl-procruntime.c> | |
30950a5f RA |
329 | /* Generally the default presumption without further information is an |
330 | * executable stack but this is not true for all platforms. */ | |
331 | ._dl_stack_flags = DEFAULT_STACK_PERMS, | |
ffa8d2a0 | 332 | #ifdef _LIBC_REENTRANT |
22c83193 | 333 | ._dl_load_lock = _RTLD_LOCK_RECURSIVE_INITIALIZER, |
5a2a1d75 | 334 | ._dl_load_write_lock = _RTLD_LOCK_RECURSIVE_INITIALIZER, |
83b53232 | 335 | ._dl_load_tls_lock = _RTLD_LOCK_RECURSIVE_INITIALIZER, |
ffa8d2a0 | 336 | #endif |
415ac3df UD |
337 | ._dl_nns = 1, |
338 | ._dl_ns = | |
339 | { | |
bea9b193 | 340 | #ifdef _LIBC_REENTRANT |
415ac3df UD |
341 | [LM_ID_BASE] = { ._ns_unique_sym_table |
342 | = { .lock = _RTLD_LOCK_RECURSIVE_INITIALIZER } } | |
bea9b193 | 343 | #endif |
415ac3df | 344 | } |
5688da55 | 345 | }; |
27a754a9 UD |
346 | /* If we would use strong_alias here the compiler would see a |
347 | non-hidden definition. This would undo the effect of the previous | |
7ee881f1 | 348 | declaration. So spell out what strong_alias does plus add the |
27a754a9 UD |
349 | visibility attribute. */ |
350 | extern struct rtld_global _rtld_local | |
351 | __attribute__ ((alias ("_rtld_global"), visibility ("hidden"))); | |
c0fb8a56 | 352 | |
afdca0f2 UD |
353 | |
354 | /* This variable is similar to _rtld_local, but all values are | |
355 | read-only after relocation. */ | |
356 | struct rtld_global_ro _rtld_global_ro attribute_relro = | |
357 | { | |
c31e278f UD |
358 | /* Get architecture specific initializer. */ |
359 | #include <dl-procinfo.c> | |
afdca0f2 UD |
360 | #ifdef NEED_DL_SYSINFO |
361 | ._dl_sysinfo = DL_SYSINFO_DEFAULT, | |
362 | #endif | |
dd70526e | 363 | ._dl_debug_fd = STDERR_FILENO, |
afdca0f2 UD |
364 | ._dl_use_load_bias = -2, |
365 | ._dl_correct_cache_id = _DL_CACHE_DEFAULT_ID, | |
ff08fc59 | 366 | #if !HAVE_TUNABLES |
afdca0f2 | 367 | ._dl_hwcap_mask = HWCAP_IMPORTANT, |
ff08fc59 | 368 | #endif |
afdca0f2 UD |
369 | ._dl_lazy = 1, |
370 | ._dl_fpu_control = _FPU_DEFAULT, | |
02d46fc4 | 371 | ._dl_pagesize = EXEC_PAGESIZE, |
73d65cc3 | 372 | ._dl_inhibit_cache = 0, |
154d10bd UD |
373 | |
374 | /* Function pointers. */ | |
154d10bd | 375 | ._dl_debug_printf = _dl_debug_printf, |
ab97ee8f | 376 | ._dl_mcount = _dl_mcount, |
021723ab | 377 | ._dl_lookup_symbol_x = _dl_lookup_symbol_x, |
9dcafc55 | 378 | ._dl_open = _dl_open, |
93025f93 | 379 | ._dl_close = _dl_close, |
b2964eb1 | 380 | ._dl_catch_error = _rtld_catch_error, |
fada9018 | 381 | ._dl_error_free = _dl_error_free, |
7c22c7ec | 382 | ._dl_tls_get_addr_soft = _dl_tls_get_addr_soft, |
f1d333b5 | 383 | ._dl_libc_freeres = __rtld_libc_freeres, |
7c22c7ec UD |
384 | #ifdef HAVE_DL_DISCOVER_OSVERSION |
385 | ._dl_discover_osversion = _dl_discover_osversion | |
386 | #endif | |
afdca0f2 UD |
387 | }; |
388 | /* If we would use strong_alias here the compiler would see a | |
389 | non-hidden definition. This would undo the effect of the previous | |
390 | declaration. So spell out was strong_alias does plus add the | |
391 | visibility attribute. */ | |
392 | extern struct rtld_global_ro _rtld_local_ro | |
393 | __attribute__ ((alias ("_rtld_global_ro"), visibility ("hidden"))); | |
394 | ||
395 | ||
67ddea92 | 396 | static void dl_main (const ElfW(Phdr) *phdr, ElfW(Word) phnum, |
3a56ea26 | 397 | ElfW(Addr) *user_entry, ElfW(auxv_t) *auxv); |
d66e34cd | 398 | |
392a6b52 | 399 | /* These two variables cannot be moved into .data.rel.ro. */ |
d6b5d570 UD |
400 | static struct libname_list _dl_rtld_libname; |
401 | static struct libname_list _dl_rtld_libname2; | |
86d2c878 | 402 | |
db276fa1 | 403 | /* Variable for statistics. */ |
1e372ded AZ |
404 | RLTD_TIMING_DECLARE (relocate_time, static); |
405 | RLTD_TIMING_DECLARE (load_time, static, attribute_relro); | |
406 | RLTD_TIMING_DECLARE (start_time, static, attribute_relro); | |
db276fa1 | 407 | |
2a76f7ef UD |
408 | /* Additional definitions needed by TLS initialization. */ |
409 | #ifdef TLS_INIT_HELPER | |
410 | TLS_INIT_HELPER | |
5e289179 UD |
411 | #endif |
412 | ||
413 | /* Helper function for syscall implementation. */ | |
414 | #ifdef DL_SYSINFO_IMPLEMENTATION | |
415 | DL_SYSINFO_IMPLEMENTATION | |
2a76f7ef UD |
416 | #endif |
417 | ||
01d8e36d UD |
418 | /* Before ld.so is relocated we must not access variables which need |
419 | relocations. This means variables which are exported. Variables | |
420 | declared as static are fine. If we can mark a variable hidden this | |
27a754a9 | 421 | is fine, too. The latter is important here. We can avoid setting |
01d8e36d UD |
422 | up a temporary link map for ld.so if we can mark _rtld_global as |
423 | hidden. */ | |
11bf311e | 424 | #ifdef PI_STATIC_AND_HIDDEN |
01d8e36d UD |
425 | # define DONT_USE_BOOTSTRAP_MAP 1 |
426 | #endif | |
427 | ||
428 | #ifdef DONT_USE_BOOTSTRAP_MAP | |
429 | static ElfW(Addr) _dl_start_final (void *arg); | |
430 | #else | |
4874b009 RM |
431 | struct dl_start_final_info |
432 | { | |
433 | struct link_map l; | |
1e372ded | 434 | RTLD_TIMING_VAR (start_time); |
4874b009 | 435 | }; |
01d8e36d | 436 | static ElfW(Addr) _dl_start_final (void *arg, |
4874b009 | 437 | struct dl_start_final_info *info); |
01d8e36d | 438 | #endif |
6a1db4ff | 439 | |
65da9563 RM |
440 | /* These defined magically in the linker script. */ |
441 | extern char _begin[] attribute_hidden; | |
eec8b6ca | 442 | extern char _etext[] attribute_hidden; |
65da9563 RM |
443 | extern char _end[] attribute_hidden; |
444 | ||
445 | ||
b1dbbaa4 RM |
446 | #ifdef RTLD_START |
447 | RTLD_START | |
448 | #else | |
eaad82e0 | 449 | # error "sysdeps/MACHINE/dl-machine.h fails to define RTLD_START" |
b1dbbaa4 RM |
450 | #endif |
451 | ||
c2248c44 RM |
452 | /* This is the second half of _dl_start (below). It can be inlined safely |
453 | under DONT_USE_BOOTSTRAP_MAP, where it is careful not to make any GOT | |
454 | references. When the tools don't permit us to avoid using a GOT entry | |
455 | for _dl_rtld_global (no attribute_hidden support), we must make sure | |
456 | this function is not inlined (see below). */ | |
457 | ||
458 | #ifdef DONT_USE_BOOTSTRAP_MAP | |
459 | static inline ElfW(Addr) __attribute__ ((always_inline)) | |
460 | _dl_start_final (void *arg) | |
461 | #else | |
462 | static ElfW(Addr) __attribute__ ((noinline)) | |
4874b009 | 463 | _dl_start_final (void *arg, struct dl_start_final_info *info) |
c2248c44 RM |
464 | #endif |
465 | { | |
466 | ElfW(Addr) start_addr; | |
c2248c44 | 467 | |
1e372ded AZ |
468 | /* If it hasn't happen yet record the startup time. */ |
469 | rtld_timer_start (&start_time); | |
470 | #if !defined DONT_USE_BOOTSTRAP_MAP | |
471 | RTLD_TIMING_SET (start_time, info->start_time); | |
4874b009 | 472 | #endif |
c2248c44 RM |
473 | |
474 | /* Transfer data about ourselves to the permanent link_map structure. */ | |
475 | #ifndef DONT_USE_BOOTSTRAP_MAP | |
4874b009 RM |
476 | GL(dl_rtld_map).l_addr = info->l.l_addr; |
477 | GL(dl_rtld_map).l_ld = info->l.l_ld; | |
b413280c | 478 | GL(dl_rtld_map).l_ld_readonly = info->l.l_ld_readonly; |
4874b009 | 479 | memcpy (GL(dl_rtld_map).l_info, info->l.l_info, |
c2248c44 | 480 | sizeof GL(dl_rtld_map).l_info); |
4874b009 | 481 | GL(dl_rtld_map).l_mach = info->l.l_mach; |
82221992 | 482 | GL(dl_rtld_map).l_relocated = 1; |
c2248c44 RM |
483 | #endif |
484 | _dl_setup_hash (&GL(dl_rtld_map)); | |
c0f62c56 | 485 | GL(dl_rtld_map).l_real = &GL(dl_rtld_map); |
c2248c44 RM |
486 | GL(dl_rtld_map).l_map_start = (ElfW(Addr)) _begin; |
487 | GL(dl_rtld_map).l_map_end = (ElfW(Addr)) _end; | |
eec8b6ca | 488 | GL(dl_rtld_map).l_text_end = (ElfW(Addr)) _etext; |
c2248c44 | 489 | /* Copy the TLS related data if necessary. */ |
11bf311e | 490 | #ifndef DONT_USE_BOOTSTRAP_MAP |
3d8c8bff | 491 | # if NO_TLS_OFFSET != 0 |
299601a1 | 492 | GL(dl_rtld_map).l_tls_offset = NO_TLS_OFFSET; |
c2248c44 | 493 | # endif |
c2248c44 RM |
494 | #endif |
495 | ||
ea4f25a7 UD |
496 | /* Initialize the stack end variable. */ |
497 | __libc_stack_end = __builtin_frame_address (0); | |
498 | ||
c2248c44 RM |
499 | /* Call the OS-dependent function to set up life so we can do things like |
500 | file access. It will call `dl_main' (below) to do all the real work | |
501 | of the dynamic linker, and then unwind our frame and run the user | |
502 | entry point on the same stack we entered on. */ | |
ecdeaac0 | 503 | start_addr = _dl_sysdep_start (arg, &dl_main); |
c2248c44 | 504 | |
a1ffb40e | 505 | if (__glibc_unlikely (GLRO(dl_debug_mask) & DL_DEBUG_STATISTICS)) |
39b04aa3 | 506 | { |
1e372ded AZ |
507 | RTLD_TIMING_VAR (rtld_total_time); |
508 | rtld_timer_stop (&rtld_total_time, start_time); | |
509 | print_statistics (RTLD_TIMING_REF(rtld_total_time)); | |
39b04aa3 | 510 | } |
c2248c44 RM |
511 | |
512 | return start_addr; | |
513 | } | |
514 | ||
01d8e36d UD |
515 | #ifdef DONT_USE_BOOTSTRAP_MAP |
516 | # define bootstrap_map GL(dl_rtld_map) | |
517 | #else | |
4874b009 | 518 | # define bootstrap_map info.l |
739d440d | 519 | #endif |
d66e34cd | 520 | |
490e6c62 FS |
521 | static ElfW(Addr) __attribute_used__ |
522 | _dl_start (void *arg) | |
523 | { | |
4874b009 | 524 | #ifdef DONT_USE_BOOTSTRAP_MAP |
1e372ded | 525 | rtld_timer_start (&start_time); |
4874b009 | 526 | #else |
490e6c62 | 527 | struct dl_start_final_info info; |
1e372ded | 528 | rtld_timer_start (&info.start_time); |
4874b009 | 529 | #endif |
db276fa1 | 530 | |
e66d0a4c UD |
531 | /* Partly clean the `bootstrap_map' structure up. Don't use |
532 | `memset' since it might not be built in or inlined and we cannot | |
533 | make function calls at this point. Use '__builtin_memset' if we | |
01d8e36d UD |
534 | know it is available. We do not have to clear the memory if we |
535 | do not have to use the temporary bootstrap_map. Global variables | |
536 | are initialized to zero by default. */ | |
537 | #ifndef DONT_USE_BOOTSTRAP_MAP | |
538 | # ifdef HAVE_BUILTIN_MEMSET | |
e66d0a4c | 539 | __builtin_memset (bootstrap_map.l_info, '\0', sizeof (bootstrap_map.l_info)); |
01d8e36d | 540 | # else |
ce460d04 | 541 | for (size_t cnt = 0; |
264ec183 UD |
542 | cnt < sizeof (bootstrap_map.l_info) / sizeof (bootstrap_map.l_info[0]); |
543 | ++cnt) | |
544 | bootstrap_map.l_info[cnt] = 0; | |
01d8e36d | 545 | # endif |
e66d0a4c | 546 | #endif |
264ec183 | 547 | |
d66e34cd | 548 | /* Figure out the run-time load address of the dynamic linker itself. */ |
86d2c878 | 549 | bootstrap_map.l_addr = elf_machine_load_address (); |
d66e34cd | 550 | |
47707456 UD |
551 | /* Read our own dynamic section and fill in the info array. */ |
552 | bootstrap_map.l_ld = (void *) bootstrap_map.l_addr + elf_machine_dynamic (); | |
2ec99d8c | 553 | bootstrap_map.l_ld_readonly = DL_RO_DYN_SECTION; |
5118dcac | 554 | elf_get_dynamic_info (&bootstrap_map, true, false); |
d66e34cd | 555 | |
11bf311e | 556 | #if NO_TLS_OFFSET != 0 |
299601a1 UD |
557 | bootstrap_map.l_tls_offset = NO_TLS_OFFSET; |
558 | #endif | |
559 | ||
d66e34cd | 560 | #ifdef ELF_MACHINE_BEFORE_RTLD_RELOC |
490e6c62 | 561 | ELF_MACHINE_BEFORE_RTLD_RELOC (&bootstrap_map, bootstrap_map.l_info); |
d66e34cd RM |
562 | #endif |
563 | ||
32e6df36 UD |
564 | if (bootstrap_map.l_addr || ! bootstrap_map.l_info[VALIDX(DT_GNU_PRELINKED)]) |
565 | { | |
566 | /* Relocate ourselves so we can do normal function calls and | |
567 | data access using the global offset table. */ | |
568 | ||
490e6c62 | 569 | ELF_DYNAMIC_RELOCATE (&bootstrap_map, NULL, 0, 0, 0); |
32e6df36 | 570 | } |
f85f3563 | 571 | bootstrap_map.l_relocated = 1; |
421f82e5 | 572 | |
ea7eb7e3 UD |
573 | /* Please note that we don't allow profiling of this object and |
574 | therefore need not test whether we have to allocate the array | |
575 | for the relocation results (as done in dl-reloc.c). */ | |
421f82e5 | 576 | |
d66e34cd RM |
577 | /* Now life is sane; we can call functions and access global data. |
578 | Set up to use the operating system facilities, and find out from | |
579 | the operating system's program loader where to find the program | |
6a1db4ff UD |
580 | header table in core. Put the rest of _dl_start into a separate |
581 | function, that way the compiler cannot put accesses to the GOT | |
582 | before ELF_DYNAMIC_RELOCATE. */ | |
3a0ecccb FW |
583 | |
584 | __rtld_malloc_init_stubs (); | |
585 | ||
5d28a896 FW |
586 | /* Do not use an initializer for these members because it would |
587 | intefere with __rtld_static_init. */ | |
588 | GLRO (dl_find_object) = &_dl_find_object; | |
589 | ||
c0282c06 | 590 | { |
01d8e36d UD |
591 | #ifdef DONT_USE_BOOTSTRAP_MAP |
592 | ElfW(Addr) entry = _dl_start_final (arg); | |
593 | #else | |
4874b009 | 594 | ElfW(Addr) entry = _dl_start_final (arg, &info); |
01d8e36d | 595 | #endif |
c0282c06 UD |
596 | |
597 | #ifndef ELF_MACHINE_START_ADDRESS | |
598 | # define ELF_MACHINE_START_ADDRESS(map, start) (start) | |
599 | #endif | |
600 | ||
7cb92a99 | 601 | return ELF_MACHINE_START_ADDRESS (GL(dl_ns)[LM_ID_BASE]._ns_loaded, entry); |
c0282c06 | 602 | } |
6a1db4ff UD |
603 | } |
604 | ||
605 | ||
d66e34cd | 606 | |
d66e34cd RM |
607 | /* Now life is peachy; we can do all normal operations. |
608 | On to the real work. */ | |
609 | ||
993b3242 UD |
610 | /* Some helper functions. */ |
611 | ||
612 | /* Arguments to relocate_doit. */ | |
613 | struct relocate_args | |
614 | { | |
615 | struct link_map *l; | |
2ca285b0 | 616 | int reloc_mode; |
993b3242 UD |
617 | }; |
618 | ||
619 | struct map_args | |
620 | { | |
621 | /* Argument to map_doit. */ | |
acf869f4 | 622 | const char *str; |
f04b9a68 | 623 | struct link_map *loader; |
f04b9a68 | 624 | int mode; |
993b3242 | 625 | /* Return value of map_doit. */ |
f04b9a68 | 626 | struct link_map *map; |
993b3242 UD |
627 | }; |
628 | ||
9dcafc55 UD |
629 | struct dlmopen_args |
630 | { | |
631 | const char *fname; | |
632 | struct link_map *map; | |
633 | }; | |
634 | ||
635 | struct lookup_args | |
636 | { | |
637 | const char *name; | |
638 | struct link_map *map; | |
639 | void *result; | |
640 | }; | |
641 | ||
993b3242 UD |
642 | /* Arguments to version_check_doit. */ |
643 | struct version_check_args | |
644 | { | |
993b3242 | 645 | int doexit; |
145b8413 | 646 | int dotrace; |
993b3242 UD |
647 | }; |
648 | ||
649 | static void | |
650 | relocate_doit (void *a) | |
651 | { | |
652 | struct relocate_args *args = (struct relocate_args *) a; | |
653 | ||
2ca285b0 | 654 | _dl_relocate_object (args->l, args->l->l_scope, args->reloc_mode, 0); |
993b3242 UD |
655 | } |
656 | ||
657 | static void | |
658 | map_doit (void *a) | |
659 | { | |
be935610 | 660 | struct map_args *args = (struct map_args *) a; |
798212a0 PP |
661 | int type = (args->mode == __RTLD_OPENEXEC) ? lt_executable : lt_library; |
662 | args->map = _dl_map_object (args->loader, args->str, type, 0, | |
8e9f92e9 | 663 | args->mode, LM_ID_BASE); |
993b3242 UD |
664 | } |
665 | ||
9dcafc55 UD |
666 | static void |
667 | dlmopen_doit (void *a) | |
668 | { | |
669 | struct dlmopen_args *args = (struct dlmopen_args *) a; | |
8e9f92e9 AS |
670 | args->map = _dl_open (args->fname, |
671 | (RTLD_LAZY | __RTLD_DLOPEN | __RTLD_AUDIT | |
672 | | __RTLD_SECURE), | |
4243cbea | 673 | dl_main, LM_ID_NEWLM, _dl_argc, _dl_argv, |
9dcafc55 UD |
674 | __environ); |
675 | } | |
676 | ||
677 | static void | |
678 | lookup_doit (void *a) | |
679 | { | |
680 | struct lookup_args *args = (struct lookup_args *) a; | |
681 | const ElfW(Sym) *ref = NULL; | |
682 | args->result = NULL; | |
683 | lookup_t l = _dl_lookup_symbol_x (args->name, args->map, &ref, | |
684 | args->map->l_local_scope, NULL, 0, | |
685 | DL_LOOKUP_RETURN_NEWEST, NULL); | |
686 | if (ref != NULL) | |
687 | args->result = DL_SYMBOL_ADDRESS (l, ref); | |
688 | } | |
689 | ||
993b3242 UD |
690 | static void |
691 | version_check_doit (void *a) | |
692 | { | |
be935610 | 693 | struct version_check_args *args = (struct version_check_args *) a; |
c0f62c56 UD |
694 | if (_dl_check_all_versions (GL(dl_ns)[LM_ID_BASE]._ns_loaded, 1, |
695 | args->dotrace) && args->doexit) | |
993b3242 UD |
696 | /* We cannot start the application. Abort now. */ |
697 | _exit (1); | |
698 | } | |
699 | ||
ce37fa88 UD |
700 | |
701 | static inline struct link_map * | |
702 | find_needed (const char *name) | |
703 | { | |
c0f62c56 UD |
704 | struct r_scope_elem *scope = &GL(dl_ns)[LM_ID_BASE]._ns_loaded->l_searchlist; |
705 | unsigned int n = scope->r_nlist; | |
ce37fa88 | 706 | |
be935610 | 707 | while (n-- > 0) |
c0f62c56 UD |
708 | if (_dl_name_match_p (name, scope->r_list[n])) |
709 | return scope->r_list[n]; | |
ce37fa88 UD |
710 | |
711 | /* Should never happen. */ | |
712 | return NULL; | |
713 | } | |
714 | ||
715 | static int | |
716 | match_version (const char *string, struct link_map *map) | |
717 | { | |
a42195db | 718 | const char *strtab = (const void *) D_PTR (map, l_info[DT_STRTAB]); |
ce37fa88 UD |
719 | ElfW(Verdef) *def; |
720 | ||
b0982c4a | 721 | #define VERDEFTAG (DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGIDX (DT_VERDEF)) |
ce37fa88 UD |
722 | if (map->l_info[VERDEFTAG] == NULL) |
723 | /* The file has no symbol versioning. */ | |
724 | return 0; | |
725 | ||
726 | def = (ElfW(Verdef) *) ((char *) map->l_addr | |
727 | + map->l_info[VERDEFTAG]->d_un.d_ptr); | |
728 | while (1) | |
729 | { | |
730 | ElfW(Verdaux) *aux = (ElfW(Verdaux) *) ((char *) def + def->vd_aux); | |
731 | ||
732 | /* Compare the version strings. */ | |
733 | if (strcmp (string, strtab + aux->vda_name) == 0) | |
734 | /* Bingo! */ | |
735 | return 1; | |
736 | ||
737 | /* If no more definitions we failed to find what we want. */ | |
738 | if (def->vd_next == 0) | |
739 | break; | |
740 | ||
741 | /* Next definition. */ | |
742 | def = (ElfW(Verdef) *) ((char *) def + def->vd_next); | |
743 | } | |
744 | ||
745 | return 0; | |
746 | } | |
747 | ||
9dcafc55 UD |
748 | static bool tls_init_tp_called; |
749 | ||
750 | static void * | |
17796419 | 751 | init_tls (size_t naudit) |
9dcafc55 UD |
752 | { |
753 | /* Number of elements in the static TLS block. */ | |
754 | GL(dl_tls_static_nelem) = GL(dl_tls_max_dtv_idx); | |
755 | ||
756 | /* Do not do this twice. The audit interface might have required | |
757 | the DTV interfaces to be set up early. */ | |
758 | if (GL(dl_initial_dtv) != NULL) | |
759 | return NULL; | |
760 | ||
761 | /* Allocate the array which contains the information about the | |
762 | dtv slots. We allocate a few entries more than needed to | |
763 | avoid the need for reallocation. */ | |
764 | size_t nelem = GL(dl_tls_max_dtv_idx) + 1 + TLS_SLOTINFO_SURPLUS; | |
765 | ||
766 | /* Allocate. */ | |
767 | GL(dl_tls_dtv_slotinfo_list) = (struct dtv_slotinfo_list *) | |
768 | calloc (sizeof (struct dtv_slotinfo_list) | |
769 | + nelem * sizeof (struct dtv_slotinfo), 1); | |
770 | /* No need to check the return value. If memory allocation failed | |
771 | the program would have been terminated. */ | |
772 | ||
773 | struct dtv_slotinfo *slotinfo = GL(dl_tls_dtv_slotinfo_list)->slotinfo; | |
774 | GL(dl_tls_dtv_slotinfo_list)->len = nelem; | |
775 | GL(dl_tls_dtv_slotinfo_list)->next = NULL; | |
776 | ||
777 | /* Fill in the information from the loaded modules. No namespace | |
778 | but the base one can be filled at this time. */ | |
779 | assert (GL(dl_ns)[LM_ID_BASE + 1]._ns_loaded == NULL); | |
780 | int i = 0; | |
781 | for (struct link_map *l = GL(dl_ns)[LM_ID_BASE]._ns_loaded; l != NULL; | |
782 | l = l->l_next) | |
783 | if (l->l_tls_blocksize != 0) | |
784 | { | |
785 | /* This is a module with TLS data. Store the map reference. | |
786 | The generation counter is zero. */ | |
787 | slotinfo[i].map = l; | |
788 | /* slotinfo[i].gen = 0; */ | |
789 | ++i; | |
790 | } | |
791 | assert (i == GL(dl_tls_max_dtv_idx)); | |
792 | ||
0c7b002f | 793 | /* Calculate the size of the static TLS surplus. */ |
17796419 | 794 | _dl_tls_static_surplus_init (naudit); |
0c7b002f | 795 | |
9dcafc55 UD |
796 | /* Compute the TLS offsets for the various blocks. */ |
797 | _dl_determine_tlsoffset (); | |
798 | ||
799 | /* Construct the static TLS block and the dtv for the initial | |
800 | thread. For some platforms this will include allocating memory | |
801 | for the thread descriptor. The memory for the TLS block will | |
802 | never be freed. It should be allocated accordingly. The dtv | |
803 | array can be changed if dynamic loading requires it. */ | |
804 | void *tcbp = _dl_allocate_tls_storage (); | |
805 | if (tcbp == NULL) | |
806 | _dl_fatal_printf ("\ | |
f648728c | 807 | cannot allocate TLS data structures for initial thread\n"); |
9dcafc55 UD |
808 | |
809 | /* Store for detection of the special case by __tls_get_addr | |
810 | so it knows not to pass this dtv to the normal realloc. */ | |
811 | GL(dl_initial_dtv) = GET_DTV (tcbp); | |
812 | ||
3d8c8bff | 813 | /* And finally install it for the main thread. */ |
774f9285 | 814 | const char *lossage = TLS_INIT_TP (tcbp); |
a1ffb40e | 815 | if (__glibc_unlikely (lossage != NULL)) |
9dcafc55 | 816 | _dl_fatal_printf ("cannot set up thread-local storage: %s\n", lossage); |
90d7e7e5 | 817 | __tls_init_tp (); |
9dcafc55 UD |
818 | tls_init_tp_called = true; |
819 | ||
820 | return tcbp; | |
821 | } | |
9dcafc55 | 822 | |
20fe49b9 | 823 | static unsigned int |
acf869f4 | 824 | do_preload (const char *fname, struct link_map *main_map, const char *where) |
20fe49b9 UD |
825 | { |
826 | const char *objname; | |
827 | const char *err_str = NULL; | |
828 | struct map_args args; | |
74780cf6 | 829 | bool malloced; |
20fe49b9 UD |
830 | |
831 | args.str = fname; | |
832 | args.loader = main_map; | |
8e9f92e9 | 833 | args.mode = __RTLD_SECURE; |
20fe49b9 UD |
834 | |
835 | unsigned int old_nloaded = GL(dl_ns)[LM_ID_BASE]._ns_nloaded; | |
836 | ||
74780cf6 | 837 | (void) _dl_catch_error (&objname, &err_str, &malloced, map_doit, &args); |
a1ffb40e | 838 | if (__glibc_unlikely (err_str != NULL)) |
20fe49b9 UD |
839 | { |
840 | _dl_error_printf ("\ | |
4db5b08f MS |
841 | ERROR: ld.so: object '%s' from %s cannot be preloaded (%s): ignored.\n", |
842 | fname, where, err_str); | |
20fe49b9 UD |
843 | /* No need to call free, this is still before |
844 | the libc's malloc is used. */ | |
845 | } | |
846 | else if (GL(dl_ns)[LM_ID_BASE]._ns_nloaded != old_nloaded) | |
847 | /* It is no duplicate. */ | |
848 | return 1; | |
849 | ||
850 | /* Nothing loaded. */ | |
851 | return 0; | |
852 | } | |
853 | ||
4c48ef06 UD |
854 | static void |
855 | security_init (void) | |
856 | { | |
857 | /* Set up the stack checker's canary. */ | |
965cb60a | 858 | uintptr_t stack_chk_guard = _dl_setup_stack_chk_guard (_dl_random); |
4c48ef06 UD |
859 | #ifdef THREAD_SET_STACK_GUARD |
860 | THREAD_SET_STACK_GUARD (stack_chk_guard); | |
861 | #else | |
862 | __stack_chk_guard = stack_chk_guard; | |
863 | #endif | |
864 | ||
865 | /* Set up the pointer guard as well, if necessary. */ | |
a014cecd FW |
866 | uintptr_t pointer_chk_guard |
867 | = _dl_setup_pointer_guard (_dl_random, stack_chk_guard); | |
4c48ef06 | 868 | #ifdef THREAD_SET_POINTER_GUARD |
a014cecd | 869 | THREAD_SET_POINTER_GUARD (pointer_chk_guard); |
4c48ef06 | 870 | #endif |
a014cecd | 871 | __pointer_chk_guard_local = pointer_chk_guard; |
965cb60a UD |
872 | |
873 | /* We do not need the _dl_random value anymore. The less | |
874 | information we leave behind, the better, so clear the | |
875 | variable. */ | |
876 | _dl_random = NULL; | |
4c48ef06 UD |
877 | } |
878 | ||
1bdda52f | 879 | #include <setup-vdso.h> |
4c48ef06 | 880 | |
6d0ba622 FW |
881 | /* The LD_PRELOAD environment variable gives list of libraries |
882 | separated by white space or colons that are loaded before the | |
883 | executable's dependencies and prepended to the global scope list. | |
884 | (If the binary is running setuid all elements containing a '/' are | |
885 | ignored since it is insecure.) Return the number of preloads | |
8692ebdb | 886 | performed. Ditto for --preload command argument. */ |
6d0ba622 | 887 | unsigned int |
8692ebdb DN |
888 | handle_preload_list (const char *preloadlist, struct link_map *main_map, |
889 | const char *where) | |
6d0ba622 FW |
890 | { |
891 | unsigned int npreloads = 0; | |
892 | const char *p = preloadlist; | |
893 | char fname[SECURE_PATH_LIMIT]; | |
894 | ||
895 | while (*p != '\0') | |
896 | { | |
897 | /* Split preload list at space/colon. */ | |
898 | size_t len = strcspn (p, " :"); | |
899 | if (len > 0 && len < sizeof (fname)) | |
900 | { | |
901 | memcpy (fname, p, len); | |
902 | fname[len] = '\0'; | |
903 | } | |
904 | else | |
905 | fname[0] = '\0'; | |
906 | ||
907 | /* Skip over the substring and the following delimiter. */ | |
908 | p += len; | |
909 | if (*p != '\0') | |
910 | ++p; | |
911 | ||
912 | if (dso_name_valid_for_suid (fname)) | |
8692ebdb | 913 | npreloads += do_preload (fname, main_map, where); |
6d0ba622 FW |
914 | } |
915 | return npreloads; | |
916 | } | |
917 | ||
3b856d09 FW |
918 | /* Called if the audit DSO cannot be used: if it does not have the |
919 | appropriate interfaces, or it expects a more recent version library | |
920 | version than what the dynamic linker provides. */ | |
921 | static void | |
922 | unload_audit_module (struct link_map *map, int original_tls_idx) | |
923 | { | |
924 | #ifndef NDEBUG | |
925 | Lmid_t ns = map->l_ns; | |
926 | #endif | |
927 | _dl_close (map); | |
928 | ||
929 | /* Make sure the namespace has been cleared entirely. */ | |
930 | assert (GL(dl_ns)[ns]._ns_loaded == NULL); | |
931 | assert (GL(dl_ns)[ns]._ns_nloaded == 0); | |
932 | ||
933 | GL(dl_tls_max_dtv_idx) = original_tls_idx; | |
934 | } | |
935 | ||
936 | /* Called to print an error message if loading of an audit module | |
937 | failed. */ | |
938 | static void | |
939 | report_audit_module_load_error (const char *name, const char *err_str, | |
940 | bool malloced) | |
941 | { | |
942 | _dl_error_printf ("\ | |
943 | ERROR: ld.so: object '%s' cannot be loaded as audit interface: %s; ignored.\n", | |
944 | name, err_str); | |
945 | if (malloced) | |
946 | free ((char *) err_str); | |
947 | } | |
948 | ||
949 | /* Load one audit module. */ | |
950 | static void | |
951 | load_audit_module (const char *name, struct audit_ifaces **last_audit) | |
952 | { | |
953 | int original_tls_idx = GL(dl_tls_max_dtv_idx); | |
954 | ||
955 | struct dlmopen_args dlmargs; | |
956 | dlmargs.fname = name; | |
957 | dlmargs.map = NULL; | |
958 | ||
959 | const char *objname; | |
960 | const char *err_str = NULL; | |
961 | bool malloced; | |
962 | _dl_catch_error (&objname, &err_str, &malloced, dlmopen_doit, &dlmargs); | |
963 | if (__glibc_unlikely (err_str != NULL)) | |
964 | { | |
965 | report_audit_module_load_error (name, err_str, malloced); | |
966 | return; | |
967 | } | |
968 | ||
969 | struct lookup_args largs; | |
970 | largs.name = "la_version"; | |
971 | largs.map = dlmargs.map; | |
972 | _dl_catch_error (&objname, &err_str, &malloced, lookup_doit, &largs); | |
973 | if (__glibc_likely (err_str != NULL)) | |
974 | { | |
975 | unload_audit_module (dlmargs.map, original_tls_idx); | |
976 | report_audit_module_load_error (name, err_str, malloced); | |
977 | return; | |
978 | } | |
979 | ||
980 | unsigned int (*laversion) (unsigned int) = largs.result; | |
981 | ||
982 | /* A null symbol indicates that something is very wrong with the | |
983 | loaded object because defined symbols are supposed to have a | |
984 | valid, non-null address. */ | |
985 | assert (laversion != NULL); | |
986 | ||
987 | unsigned int lav = laversion (LAV_CURRENT); | |
988 | if (lav == 0) | |
989 | { | |
990 | /* Only print an error message if debugging because this can | |
991 | happen deliberately. */ | |
992 | if (GLRO(dl_debug_mask) & DL_DEBUG_FILES) | |
993 | _dl_debug_printf ("\ | |
994 | file=%s [%lu]; audit interface function la_version returned zero; ignored.\n", | |
995 | dlmargs.map->l_name, dlmargs.map->l_ns); | |
996 | unload_audit_module (dlmargs.map, original_tls_idx); | |
997 | return; | |
998 | } | |
999 | ||
1000 | if (lav > LAV_CURRENT) | |
1001 | { | |
1002 | _dl_debug_printf ("\ | |
1003 | ERROR: audit interface '%s' requires version %d (maximum supported version %d); ignored.\n", | |
1004 | name, lav, LAV_CURRENT); | |
1005 | unload_audit_module (dlmargs.map, original_tls_idx); | |
1006 | return; | |
1007 | } | |
1008 | ||
1009 | enum { naudit_ifaces = 8 }; | |
1010 | union | |
1011 | { | |
1012 | struct audit_ifaces ifaces; | |
1013 | void (*fptr[naudit_ifaces]) (void); | |
1014 | } *newp = malloc (sizeof (*newp)); | |
1015 | if (newp == NULL) | |
1016 | _dl_fatal_printf ("Out of memory while loading audit modules\n"); | |
1017 | ||
1018 | /* Names of the auditing interfaces. All in one | |
1019 | long string. */ | |
1020 | static const char audit_iface_names[] = | |
1021 | "la_activity\0" | |
1022 | "la_objsearch\0" | |
1023 | "la_objopen\0" | |
1024 | "la_preinit\0" | |
063f9ba2 | 1025 | LA_SYMBIND "\0" |
3b856d09 FW |
1026 | #define STRING(s) __STRING (s) |
1027 | "la_" STRING (ARCH_LA_PLTENTER) "\0" | |
1028 | "la_" STRING (ARCH_LA_PLTEXIT) "\0" | |
1029 | "la_objclose\0"; | |
1030 | unsigned int cnt = 0; | |
1031 | const char *cp = audit_iface_names; | |
1032 | do | |
1033 | { | |
1034 | largs.name = cp; | |
1035 | _dl_catch_error (&objname, &err_str, &malloced, lookup_doit, &largs); | |
1036 | ||
1037 | /* Store the pointer. */ | |
1038 | if (err_str == NULL && largs.result != NULL) | |
c7bf5cea | 1039 | newp->fptr[cnt] = largs.result; |
3b856d09 FW |
1040 | else |
1041 | newp->fptr[cnt] = NULL; | |
1042 | ++cnt; | |
1043 | ||
1044 | cp = rawmemchr (cp, '\0') + 1; | |
1045 | } | |
1046 | while (*cp != '\0'); | |
1047 | assert (cnt == naudit_ifaces); | |
1048 | ||
1049 | /* Now append the new auditing interface to the list. */ | |
1050 | newp->ifaces.next = NULL; | |
1051 | if (*last_audit == NULL) | |
1052 | *last_audit = GLRO(dl_audit) = &newp->ifaces; | |
1053 | else | |
1054 | *last_audit = (*last_audit)->next = &newp->ifaces; | |
c7bf5cea | 1055 | |
e1d559f3 FW |
1056 | /* The dynamic linker link map is statically allocated, so the |
1057 | cookie in _dl_new_object has not happened. */ | |
1058 | link_map_audit_state (&GL (dl_rtld_map), GLRO (dl_naudit))->cookie | |
c7bf5cea FW |
1059 | = (intptr_t) &GL (dl_rtld_map); |
1060 | ||
3b856d09 FW |
1061 | ++GLRO(dl_naudit); |
1062 | ||
1063 | /* Mark the DSO as being used for auditing. */ | |
1064 | dlmargs.map->l_auditing = 1; | |
1065 | } | |
1066 | ||
3b856d09 FW |
1067 | /* Load all audit modules. */ |
1068 | static void | |
4c6e0415 | 1069 | load_audit_modules (struct link_map *main_map, struct audit_list *audit_list) |
3b856d09 FW |
1070 | { |
1071 | struct audit_ifaces *last_audit = NULL; | |
3b856d09 FW |
1072 | |
1073 | while (true) | |
1074 | { | |
4c6e0415 | 1075 | const char *name = audit_list_next (audit_list); |
3b856d09 FW |
1076 | if (name == NULL) |
1077 | break; | |
1078 | load_audit_module (name, &last_audit); | |
1079 | } | |
1080 | ||
1081 | /* Notify audit modules of the initially loaded modules (the main | |
1082 | program and the dynamic linker itself). */ | |
1083 | if (GLRO(dl_naudit) > 0) | |
1084 | { | |
aee6e90f AZ |
1085 | _dl_audit_objopen (main_map, LM_ID_BASE); |
1086 | _dl_audit_objopen (&GL(dl_rtld_map), LM_ID_BASE); | |
3b856d09 FW |
1087 | } |
1088 | } | |
1089 | ||
c1cb2dee FW |
1090 | /* Check if the executable is not actualy dynamically linked, and |
1091 | invoke it directly in that case. */ | |
1092 | static void | |
1093 | rtld_chain_load (struct link_map *main_map, char *argv0) | |
1094 | { | |
1095 | /* The dynamic loader run against itself. */ | |
1096 | const char *rtld_soname | |
1097 | = ((const char *) D_PTR (&GL(dl_rtld_map), l_info[DT_STRTAB]) | |
1098 | + GL(dl_rtld_map).l_info[DT_SONAME]->d_un.d_val); | |
1099 | if (main_map->l_info[DT_SONAME] != NULL | |
1100 | && strcmp (rtld_soname, | |
1101 | ((const char *) D_PTR (main_map, l_info[DT_STRTAB]) | |
1102 | + main_map->l_info[DT_SONAME]->d_un.d_val)) == 0) | |
1103 | _dl_fatal_printf ("%s: loader cannot load itself\n", rtld_soname); | |
1104 | ||
1105 | /* With DT_NEEDED dependencies, the executable is dynamically | |
1106 | linked. */ | |
1107 | if (__glibc_unlikely (main_map->l_info[DT_NEEDED] != NULL)) | |
1108 | return; | |
1109 | ||
1110 | /* If the executable has program interpreter, it is dynamically | |
1111 | linked. */ | |
1112 | for (size_t i = 0; i < main_map->l_phnum; ++i) | |
1113 | if (main_map->l_phdr[i].p_type == PT_INTERP) | |
1114 | return; | |
1115 | ||
1116 | const char *pathname = _dl_argv[0]; | |
1117 | if (argv0 != NULL) | |
1118 | _dl_argv[0] = argv0; | |
1119 | int errcode = __rtld_execve (pathname, _dl_argv, _environ); | |
1120 | const char *errname = strerrorname_np (errcode); | |
1121 | if (errname != NULL) | |
1122 | _dl_fatal_printf("%s: cannot execute %s: %s\n", | |
1123 | rtld_soname, pathname, errname); | |
1124 | else | |
1125 | _dl_fatal_printf("%s: cannot execute %s: %d\n", | |
f1eeef94 | 1126 | rtld_soname, pathname, errcode); |
c1cb2dee FW |
1127 | } |
1128 | ||
d66e34cd | 1129 | static void |
266180eb | 1130 | dl_main (const ElfW(Phdr) *phdr, |
72f70279 | 1131 | ElfW(Word) phnum, |
3a56ea26 AK |
1132 | ElfW(Addr) *user_entry, |
1133 | ElfW(auxv_t) *auxv) | |
d66e34cd | 1134 | { |
266180eb | 1135 | const ElfW(Phdr) *ph; |
c0f62c56 | 1136 | struct link_map *main_map; |
14bab8de UD |
1137 | size_t file_size; |
1138 | char *file; | |
164a7164 | 1139 | bool has_interp = false; |
77aba05b | 1140 | unsigned int i; |
164a7164 UD |
1141 | bool prelinked = false; |
1142 | bool rtld_is_main = false; | |
9dcafc55 | 1143 | void *tcbp = NULL; |
d66e34cd | 1144 | |
2bf9e641 FW |
1145 | struct dl_main_state state; |
1146 | dl_main_state_init (&state); | |
4c6e0415 | 1147 | |
d017b0ab | 1148 | __tls_pre_init_tp (); |
334fcf2a | 1149 | |
2dd87703 | 1150 | #if !PTHREAD_IN_LIBC |
c70ba488 RM |
1151 | /* The explicit initialization here is cheaper than processing the reloc |
1152 | in the _rtld_local definition's initializer. */ | |
1153 | GL(dl_make_stack_executable_hook) = &_dl_make_stack_executable; | |
2dd87703 | 1154 | #endif |
c70ba488 | 1155 | |
ea278354 | 1156 | /* Process the environment variable which control the behaviour. */ |
2bf9e641 | 1157 | process_envvars (&state); |
3996f34b | 1158 | |
ce6e047f | 1159 | #ifndef HAVE_INLINED_SYSCALLS |
46ec036d | 1160 | /* Set up a flag which tells we are just starting. */ |
9cf27b8d | 1161 | _dl_starting_up = 1; |
ce6e047f | 1162 | #endif |
46ec036d | 1163 | |
e0f1a58f | 1164 | const char *ld_so_name = _dl_argv[0]; |
a16956f3 | 1165 | if (*user_entry == (ElfW(Addr)) ENTRY_POINT) |
0200214b RM |
1166 | { |
1167 | /* Ho ho. We are not the program interpreter! We are the program | |
1168 | itself! This means someone ran ld.so as a command. Well, that | |
1169 | might be convenient to do sometimes. We support it by | |
1170 | interpreting the args like this: | |
1171 | ||
1172 | ld.so PROGRAM ARGS... | |
1173 | ||
1174 | The first argument is the name of a file containing an ELF | |
1175 | executable we will load and run with the following arguments. | |
1176 | To simplify life here, PROGRAM is searched for using the | |
1177 | normal rules for shared objects, rather than $PATH or anything | |
1178 | like that. We just load it and use its entry point; we don't | |
1179 | pay attention to its PT_INTERP command (we are the interpreter | |
1180 | ourselves). This is an easy way to test a new ld.so before | |
1181 | installing it. */ | |
164a7164 | 1182 | rtld_is_main = true; |
421f82e5 | 1183 | |
c6702789 VM |
1184 | char *argv0 = NULL; |
1185 | ||
ffee1316 | 1186 | /* Note the place where the dynamic linker actually came from. */ |
e6caf4e1 | 1187 | GL(dl_rtld_map).l_name = rtld_progname; |
6a76c115 | 1188 | |
fd26970f | 1189 | while (_dl_argc > 1) |
4243cbea | 1190 | if (! strcmp (_dl_argv[1], "--list")) |
fd26970f | 1191 | { |
e0f1a58f FW |
1192 | if (state.mode != rtld_mode_help) |
1193 | { | |
1194 | state.mode = rtld_mode_list; | |
1195 | /* This means do no dependency analysis. */ | |
1196 | GLRO(dl_lazy) = -1; | |
1197 | } | |
61965e9b | 1198 | |
fd26970f UD |
1199 | ++_dl_skip_args; |
1200 | --_dl_argc; | |
4243cbea | 1201 | ++_dl_argv; |
fd26970f | 1202 | } |
4243cbea | 1203 | else if (! strcmp (_dl_argv[1], "--verify")) |
fd26970f | 1204 | { |
e0f1a58f FW |
1205 | if (state.mode != rtld_mode_help) |
1206 | state.mode = rtld_mode_verify; | |
6a76c115 | 1207 | |
73d65cc3 SP |
1208 | ++_dl_skip_args; |
1209 | --_dl_argc; | |
4243cbea | 1210 | ++_dl_argv; |
73d65cc3 | 1211 | } |
4243cbea | 1212 | else if (! strcmp (_dl_argv[1], "--inhibit-cache")) |
73d65cc3 SP |
1213 | { |
1214 | GLRO(dl_inhibit_cache) = 1; | |
fd26970f UD |
1215 | ++_dl_skip_args; |
1216 | --_dl_argc; | |
4243cbea | 1217 | ++_dl_argv; |
fd26970f | 1218 | } |
4243cbea | 1219 | else if (! strcmp (_dl_argv[1], "--library-path") |
e6caf4e1 | 1220 | && _dl_argc > 2) |
880f421f | 1221 | { |
2bf9e641 | 1222 | state.library_path = _dl_argv[2]; |
27316f4a | 1223 | state.library_path_source = "--library-path"; |
880f421f | 1224 | |
310930c1 UD |
1225 | _dl_skip_args += 2; |
1226 | _dl_argc -= 2; | |
4243cbea | 1227 | _dl_argv += 2; |
310930c1 | 1228 | } |
4243cbea | 1229 | else if (! strcmp (_dl_argv[1], "--inhibit-rpath") |
e6caf4e1 | 1230 | && _dl_argc > 2) |
310930c1 | 1231 | { |
4243cbea | 1232 | GLRO(dl_inhibit_rpath) = _dl_argv[2]; |
310930c1 | 1233 | |
74780cf6 UD |
1234 | _dl_skip_args += 2; |
1235 | _dl_argc -= 2; | |
4243cbea | 1236 | _dl_argv += 2; |
74780cf6 | 1237 | } |
4243cbea | 1238 | else if (! strcmp (_dl_argv[1], "--audit") && _dl_argc > 2) |
74780cf6 | 1239 | { |
2bf9e641 | 1240 | audit_list_add_string (&state.audit_list, _dl_argv[2]); |
74780cf6 | 1241 | |
8692ebdb DN |
1242 | _dl_skip_args += 2; |
1243 | _dl_argc -= 2; | |
1244 | _dl_argv += 2; | |
1245 | } | |
1246 | else if (! strcmp (_dl_argv[1], "--preload") && _dl_argc > 2) | |
1247 | { | |
2bf9e641 | 1248 | state.preloadarg = _dl_argv[2]; |
c6702789 VM |
1249 | _dl_skip_args += 2; |
1250 | _dl_argc -= 2; | |
1251 | _dl_argv += 2; | |
1252 | } | |
1253 | else if (! strcmp (_dl_argv[1], "--argv0") && _dl_argc > 2) | |
1254 | { | |
1255 | argv0 = _dl_argv[2]; | |
1256 | ||
dad90d52 FW |
1257 | _dl_skip_args += 2; |
1258 | _dl_argc -= 2; | |
1259 | _dl_argv += 2; | |
1260 | } | |
1261 | else if (strcmp (_dl_argv[1], "--glibc-hwcaps-prepend") == 0 | |
1262 | && _dl_argc > 2) | |
1263 | { | |
1264 | state.glibc_hwcaps_prepend = _dl_argv[2]; | |
1265 | _dl_skip_args += 2; | |
1266 | _dl_argc -= 2; | |
1267 | _dl_argv += 2; | |
1268 | } | |
1269 | else if (strcmp (_dl_argv[1], "--glibc-hwcaps-mask") == 0 | |
1270 | && _dl_argc > 2) | |
1271 | { | |
1272 | state.glibc_hwcaps_mask = _dl_argv[2]; | |
880f421f UD |
1273 | _dl_skip_args += 2; |
1274 | _dl_argc -= 2; | |
4243cbea | 1275 | _dl_argv += 2; |
880f421f | 1276 | } |
86f65dff L |
1277 | #if HAVE_TUNABLES |
1278 | else if (! strcmp (_dl_argv[1], "--list-tunables")) | |
1279 | { | |
1280 | state.mode = rtld_mode_list_tunables; | |
1281 | ||
1282 | ++_dl_skip_args; | |
1283 | --_dl_argc; | |
1284 | ++_dl_argv; | |
1285 | } | |
1286 | #endif | |
851f32cf FW |
1287 | else if (! strcmp (_dl_argv[1], "--list-diagnostics")) |
1288 | { | |
1289 | state.mode = rtld_mode_list_diagnostics; | |
1290 | ||
1291 | ++_dl_skip_args; | |
1292 | --_dl_argc; | |
1293 | ++_dl_argv; | |
1294 | } | |
e0f1a58f FW |
1295 | else if (strcmp (_dl_argv[1], "--help") == 0) |
1296 | { | |
1297 | state.mode = rtld_mode_help; | |
1298 | --_dl_argc; | |
1299 | ++_dl_argv; | |
1300 | } | |
542923d9 FW |
1301 | else if (strcmp (_dl_argv[1], "--version") == 0) |
1302 | _dl_version (); | |
e0f1a58f FW |
1303 | else if (_dl_argv[1][0] == '-' && _dl_argv[1][1] == '-') |
1304 | { | |
1305 | if (_dl_argv[1][1] == '\0') | |
1306 | /* End of option list. */ | |
1307 | break; | |
1308 | else | |
1309 | /* Unrecognized option. */ | |
1310 | _dl_usage (ld_so_name, _dl_argv[1]); | |
1311 | } | |
fd26970f UD |
1312 | else |
1313 | break; | |
d66e34cd | 1314 | |
86f65dff L |
1315 | #if HAVE_TUNABLES |
1316 | if (__glibc_unlikely (state.mode == rtld_mode_list_tunables)) | |
1317 | { | |
1318 | __tunables_print (); | |
1319 | _exit (0); | |
1320 | } | |
1321 | #endif | |
1322 | ||
851f32cf FW |
1323 | if (state.mode == rtld_mode_list_diagnostics) |
1324 | _dl_print_diagnostics (_environ); | |
1325 | ||
61eb22d3 UD |
1326 | /* If we have no further argument the program was called incorrectly. |
1327 | Grant the user some education. */ | |
1328 | if (_dl_argc < 2) | |
e0f1a58f FW |
1329 | { |
1330 | if (state.mode == rtld_mode_help) | |
1331 | /* --help without an executable is not an error. */ | |
1332 | _dl_help (ld_so_name, &state); | |
1333 | else | |
1334 | _dl_usage (ld_so_name, NULL); | |
1335 | } | |
61eb22d3 | 1336 | |
0200214b RM |
1337 | ++_dl_skip_args; |
1338 | --_dl_argc; | |
4243cbea | 1339 | ++_dl_argv; |
91f62ce6 | 1340 | |
c70ba488 RM |
1341 | /* The initialization of _dl_stack_flags done below assumes the |
1342 | executable's PT_GNU_STACK may have been honored by the kernel, and | |
1343 | so a PT_GNU_STACK with PF_X set means the stack started out with | |
1344 | execute permission. However, this is not really true if the | |
1345 | dynamic linker is the executable the kernel loaded. For this | |
1346 | case, we must reinitialize _dl_stack_flags to match the dynamic | |
1347 | linker itself. If the dynamic linker was built with a | |
1348 | PT_GNU_STACK, then the kernel may have loaded us with a | |
1349 | nonexecutable stack that we will have to make executable when we | |
1350 | load the program below unless it has a PT_GNU_STACK indicating | |
1351 | nonexecutable stack is ok. */ | |
1352 | ||
1353 | for (ph = phdr; ph < &phdr[phnum]; ++ph) | |
1354 | if (ph->p_type == PT_GNU_STACK) | |
1355 | { | |
1356 | GL(dl_stack_flags) = ph->p_flags; | |
1357 | break; | |
1358 | } | |
1359 | ||
e0f1a58f FW |
1360 | if (__glibc_unlikely (state.mode == rtld_mode_verify |
1361 | || state.mode == rtld_mode_help)) | |
2de99474 | 1362 | { |
8e17ea58 UD |
1363 | const char *objname; |
1364 | const char *err_str = NULL; | |
993b3242 | 1365 | struct map_args args; |
74780cf6 | 1366 | bool malloced; |
2de99474 | 1367 | |
e6caf4e1 | 1368 | args.str = rtld_progname; |
f04b9a68 | 1369 | args.loader = NULL; |
f04b9a68 | 1370 | args.mode = __RTLD_OPENEXEC; |
74780cf6 UD |
1371 | (void) _dl_catch_error (&objname, &err_str, &malloced, map_doit, |
1372 | &args); | |
a1ffb40e | 1373 | if (__glibc_unlikely (err_str != NULL)) |
e0f1a58f FW |
1374 | { |
1375 | /* We don't free the returned string, the programs stops | |
1376 | anyway. */ | |
1377 | if (state.mode == rtld_mode_help) | |
1378 | /* Mask the failure to load the main object. The help | |
1379 | message contains less information in this case. */ | |
1380 | _dl_help (ld_so_name, &state); | |
1381 | else | |
1382 | _exit (EXIT_FAILURE); | |
1383 | } | |
2de99474 UD |
1384 | } |
1385 | else | |
db276fa1 | 1386 | { |
1e372ded AZ |
1387 | RTLD_TIMING_VAR (start); |
1388 | rtld_timer_start (&start); | |
798212a0 | 1389 | _dl_map_object (NULL, rtld_progname, lt_executable, 0, |
c0f62c56 | 1390 | __RTLD_OPENEXEC, LM_ID_BASE); |
1e372ded | 1391 | rtld_timer_stop (&load_time, start); |
db276fa1 | 1392 | } |
2de99474 | 1393 | |
c0f62c56 UD |
1394 | /* Now the map for the main executable is available. */ |
1395 | main_map = GL(dl_ns)[LM_ID_BASE]._ns_loaded; | |
1396 | ||
c1cb2dee FW |
1397 | if (__glibc_likely (state.mode == rtld_mode_normal)) |
1398 | rtld_chain_load (main_map, argv0); | |
01f16ab0 | 1399 | |
c0f62c56 UD |
1400 | phdr = main_map->l_phdr; |
1401 | phnum = main_map->l_phnum; | |
143e2b96 UD |
1402 | /* We overwrite here a pointer to a malloc()ed string. But since |
1403 | the malloc() implementation used at this point is the dummy | |
1404 | implementations which has no real free() function it does not | |
1405 | makes sense to free the old string first. */ | |
c0f62c56 UD |
1406 | main_map->l_name = (char *) ""; |
1407 | *user_entry = main_map->l_entry; | |
3a56ea26 | 1408 | |
15a0c573 CLT |
1409 | /* Set bit indicating this is the main program map. */ |
1410 | main_map->l_main_map = 1; | |
1411 | ||
bc58236c | 1412 | #ifdef HAVE_AUX_VECTOR |
3a56ea26 AK |
1413 | /* Adjust the on-stack auxiliary vector so that it looks like the |
1414 | binary was executed directly. */ | |
bc58236c | 1415 | for (ElfW(auxv_t) *av = auxv; av->a_type != AT_NULL; av++) |
3a56ea26 AK |
1416 | switch (av->a_type) |
1417 | { | |
1418 | case AT_PHDR: | |
4dd019e3 | 1419 | av->a_un.a_val = (uintptr_t) phdr; |
3a56ea26 AK |
1420 | break; |
1421 | case AT_PHNUM: | |
1422 | av->a_un.a_val = phnum; | |
1423 | break; | |
1424 | case AT_ENTRY: | |
1425 | av->a_un.a_val = *user_entry; | |
1426 | break; | |
5c349950 PP |
1427 | case AT_EXECFN: |
1428 | av->a_un.a_val = (uintptr_t) _dl_argv[0]; | |
1429 | break; | |
3a56ea26 | 1430 | } |
bc58236c | 1431 | #endif |
c6702789 VM |
1432 | |
1433 | /* Set the argv[0] string now that we've processed the executable. */ | |
1434 | if (argv0 != NULL) | |
1435 | _dl_argv[0] = argv0; | |
0200214b RM |
1436 | } |
1437 | else | |
1438 | { | |
1439 | /* Create a link_map for the executable itself. | |
1440 | This will be what dlopen on "" returns. */ | |
9fbdeb41 UD |
1441 | main_map = _dl_new_object ((char *) "", "", lt_executable, NULL, |
1442 | __RTLD_OPENEXEC, LM_ID_BASE); | |
9dcafc55 | 1443 | assert (main_map != NULL); |
c0f62c56 UD |
1444 | main_map->l_phdr = phdr; |
1445 | main_map->l_phnum = phnum; | |
1446 | main_map->l_entry = *user_entry; | |
da832465 | 1447 | |
f0967738 AK |
1448 | /* Even though the link map is not yet fully initialized we can add |
1449 | it to the map list since there are no possible users running yet. */ | |
1450 | _dl_add_to_namespace_list (main_map, LM_ID_BASE); | |
fa41c84d | 1451 | assert (main_map == GL(dl_ns)[LM_ID_BASE]._ns_loaded); |
f0967738 | 1452 | |
61e0617a UD |
1453 | /* At this point we are in a bit of trouble. We would have to |
1454 | fill in the values for l_dev and l_ino. But in general we | |
1455 | do not know where the file is. We also do not handle AT_EXECFD | |
1456 | even if it would be passed up. | |
1457 | ||
1458 | We leave the values here defined to 0. This is normally no | |
1459 | problem as the program code itself is normally no shared | |
1460 | object and therefore cannot be loaded dynamically. Nothing | |
1461 | prevent the use of dynamic binaries and in these situations | |
1462 | we might get problems. We might not be able to find out | |
1463 | whether the object is already loaded. But since there is no | |
1464 | easy way out and because the dynamic binary must also not | |
1465 | have an SONAME we ignore this program for now. If it becomes | |
1466 | a problem we can force people using SONAMEs. */ | |
1467 | ||
97a51d8a UD |
1468 | /* We delay initializing the path structure until we got the dynamic |
1469 | information for the program. */ | |
0200214b RM |
1470 | } |
1471 | ||
c0f62c56 UD |
1472 | main_map->l_map_end = 0; |
1473 | main_map->l_text_end = 0; | |
052b6a6c | 1474 | /* Perhaps the executable has no PT_LOAD header entries at all. */ |
c0f62c56 | 1475 | main_map->l_map_start = ~0; |
c0f62c56 UD |
1476 | /* And it was opened directly. */ |
1477 | ++main_map->l_direct_opencount; | |
052b6a6c | 1478 | |
0200214b | 1479 | /* Scan the program header table for the dynamic section. */ |
72f70279 | 1480 | for (ph = phdr; ph < &phdr[phnum]; ++ph) |
0200214b RM |
1481 | switch (ph->p_type) |
1482 | { | |
da832465 UD |
1483 | case PT_PHDR: |
1484 | /* Find out the load address. */ | |
c0f62c56 | 1485 | main_map->l_addr = (ElfW(Addr)) phdr - ph->p_vaddr; |
da832465 | 1486 | break; |
0200214b RM |
1487 | case PT_DYNAMIC: |
1488 | /* This tells us where to find the dynamic section, | |
1489 | which tells us everything we need to do. */ | |
c0f62c56 | 1490 | main_map->l_ld = (void *) main_map->l_addr + ph->p_vaddr; |
b413280c | 1491 | main_map->l_ld_readonly = (ph->p_flags & PF_W) == 0; |
0200214b RM |
1492 | break; |
1493 | case PT_INTERP: | |
1494 | /* This "interpreter segment" was used by the program loader to | |
1495 | find the program interpreter, which is this program itself, the | |
1496 | dynamic linker. We note what name finds us, so that a future | |
1497 | dlopen call or DT_NEEDED entry, for something that wants to link | |
1498 | against the dynamic linker as a shared library, will know that | |
1499 | the shared object is already loaded. */ | |
c0f62c56 | 1500 | _dl_rtld_libname.name = ((const char *) main_map->l_addr |
be935610 | 1501 | + ph->p_vaddr); |
752a2a50 | 1502 | /* _dl_rtld_libname.next = NULL; Already zero. */ |
d6b5d570 | 1503 | GL(dl_rtld_map).l_libname = &_dl_rtld_libname; |
f41c8091 UD |
1504 | |
1505 | /* Ordinarilly, we would get additional names for the loader from | |
1506 | our DT_SONAME. This can't happen if we were actually linked as | |
1507 | a static executable (detect this case when we have no DYNAMIC). | |
1508 | If so, assume the filename component of the interpreter path to | |
1509 | be our SONAME, and add it to our name list. */ | |
d6b5d570 | 1510 | if (GL(dl_rtld_map).l_ld == NULL) |
f41c8091 | 1511 | { |
88794e30 UD |
1512 | const char *p = NULL; |
1513 | const char *cp = _dl_rtld_libname.name; | |
1514 | ||
1515 | /* Find the filename part of the path. */ | |
1516 | while (*cp != '\0') | |
1517 | if (*cp++ == '/') | |
1518 | p = cp; | |
1519 | ||
1520 | if (p != NULL) | |
f41c8091 | 1521 | { |
88794e30 | 1522 | _dl_rtld_libname2.name = p; |
752a2a50 | 1523 | /* _dl_rtld_libname2.next = NULL; Already zero. */ |
f41c8091 UD |
1524 | _dl_rtld_libname.next = &_dl_rtld_libname2; |
1525 | } | |
1526 | } | |
1527 | ||
164a7164 | 1528 | has_interp = true; |
0200214b | 1529 | break; |
052b6a6c | 1530 | case PT_LOAD: |
052b6a6c UD |
1531 | { |
1532 | ElfW(Addr) mapstart; | |
2373b30e UD |
1533 | ElfW(Addr) allocend; |
1534 | ||
1535 | /* Remember where the main program starts in memory. */ | |
b92e3780 UD |
1536 | mapstart = (main_map->l_addr |
1537 | + (ph->p_vaddr & ~(GLRO(dl_pagesize) - 1))); | |
c0f62c56 UD |
1538 | if (main_map->l_map_start > mapstart) |
1539 | main_map->l_map_start = mapstart; | |
2373b30e UD |
1540 | |
1541 | /* Also where it ends. */ | |
c0f62c56 UD |
1542 | allocend = main_map->l_addr + ph->p_vaddr + ph->p_memsz; |
1543 | if (main_map->l_map_end < allocend) | |
1544 | main_map->l_map_end = allocend; | |
1545 | if ((ph->p_flags & PF_X) && allocend > main_map->l_text_end) | |
1546 | main_map->l_text_end = allocend; | |
052b6a6c UD |
1547 | } |
1548 | break; | |
9dcafc55 | 1549 | |
a334319f | 1550 | case PT_TLS: |
aed283dd UD |
1551 | if (ph->p_memsz > 0) |
1552 | { | |
1553 | /* Note that in the case the dynamic linker we duplicate work | |
1554 | here since we read the PT_TLS entry already in | |
1555 | _dl_start_final. But the result is repeatable so do not | |
1556 | check for this special but unimportant case. */ | |
c0f62c56 UD |
1557 | main_map->l_tls_blocksize = ph->p_memsz; |
1558 | main_map->l_tls_align = ph->p_align; | |
99fe3b0e | 1559 | if (ph->p_align == 0) |
c0f62c56 | 1560 | main_map->l_tls_firstbyte_offset = 0; |
99fe3b0e | 1561 | else |
c0f62c56 UD |
1562 | main_map->l_tls_firstbyte_offset = (ph->p_vaddr |
1563 | & (ph->p_align - 1)); | |
1564 | main_map->l_tls_initimage_size = ph->p_filesz; | |
1565 | main_map->l_tls_initimage = (void *) ph->p_vaddr; | |
aed283dd UD |
1566 | |
1567 | /* This image gets the ID one. */ | |
c0f62c56 | 1568 | GL(dl_tls_max_dtv_idx) = main_map->l_tls_modid = 1; |
aed283dd | 1569 | } |
9dcafc55 UD |
1570 | break; |
1571 | ||
ecdeaac0 RM |
1572 | case PT_GNU_STACK: |
1573 | GL(dl_stack_flags) = ph->p_flags; | |
1574 | break; | |
e8ed861d UD |
1575 | |
1576 | case PT_GNU_RELRO: | |
c0f62c56 UD |
1577 | main_map->l_relro_addr = ph->p_vaddr; |
1578 | main_map->l_relro_size = ph->p_memsz; | |
e8ed861d | 1579 | break; |
c7aa8596 SN |
1580 | } |
1581 | /* Process program headers again, but scan them backwards so | |
1582 | that PT_NOTE can be skipped if PT_GNU_PROPERTY exits. */ | |
1583 | for (ph = &phdr[phnum]; ph != phdr; --ph) | |
1584 | switch (ph[-1].p_type) | |
1585 | { | |
f753fa7d | 1586 | case PT_NOTE: |
c00452d7 | 1587 | _dl_process_pt_note (main_map, -1, &ph[-1]); |
c7aa8596 SN |
1588 | break; |
1589 | case PT_GNU_PROPERTY: | |
c00452d7 | 1590 | _dl_process_pt_gnu_property (main_map, -1, &ph[-1]); |
f753fa7d | 1591 | break; |
0200214b | 1592 | } |
11bf311e UD |
1593 | |
1594 | /* Adjust the address of the TLS initialization image in case | |
1595 | the executable is actually an ET_DYN object. */ | |
1596 | if (main_map->l_tls_initimage != NULL) | |
1597 | main_map->l_tls_initimage | |
1598 | = (char *) main_map->l_tls_initimage + main_map->l_addr; | |
c0f62c56 UD |
1599 | if (! main_map->l_map_end) |
1600 | main_map->l_map_end = ~0; | |
1601 | if (! main_map->l_text_end) | |
1602 | main_map->l_text_end = ~0; | |
d6b5d570 | 1603 | if (! GL(dl_rtld_map).l_libname && GL(dl_rtld_map).l_name) |
c84142e8 UD |
1604 | { |
1605 | /* We were invoked directly, so the program might not have a | |
1606 | PT_INTERP. */ | |
d6b5d570 | 1607 | _dl_rtld_libname.name = GL(dl_rtld_map).l_name; |
f0967738 | 1608 | /* _dl_rtld_libname.next = NULL; Already zero. */ |
d6b5d570 | 1609 | GL(dl_rtld_map).l_libname = &_dl_rtld_libname; |
c84142e8 | 1610 | } |
ffee1316 | 1611 | else |
d6b5d570 | 1612 | assert (GL(dl_rtld_map).l_libname); /* How else did we get here? */ |
0200214b | 1613 | |
9dcafc55 UD |
1614 | /* If the current libname is different from the SONAME, add the |
1615 | latter as well. */ | |
1616 | if (GL(dl_rtld_map).l_info[DT_SONAME] != NULL | |
1617 | && strcmp (GL(dl_rtld_map).l_libname->name, | |
1618 | (const char *) D_PTR (&GL(dl_rtld_map), l_info[DT_STRTAB]) | |
1619 | + GL(dl_rtld_map).l_info[DT_SONAME]->d_un.d_val) != 0) | |
1620 | { | |
1621 | static struct libname_list newname; | |
1622 | newname.name = ((char *) D_PTR (&GL(dl_rtld_map), l_info[DT_STRTAB]) | |
1623 | + GL(dl_rtld_map).l_info[DT_SONAME]->d_un.d_ptr); | |
1624 | newname.next = NULL; | |
1625 | newname.dont_free = 1; | |
1626 | ||
1627 | assert (GL(dl_rtld_map).l_libname->next == NULL); | |
1628 | GL(dl_rtld_map).l_libname->next = &newname; | |
1629 | } | |
1630 | /* The ld.so must be relocated since otherwise loading audit modules | |
1631 | will fail since they reuse the very same ld.so. */ | |
1632 | assert (GL(dl_rtld_map).l_relocated); | |
1633 | ||
9a51759b UD |
1634 | if (! rtld_is_main) |
1635 | { | |
1636 | /* Extract the contents of the dynamic section for easy access. */ | |
5118dcac | 1637 | elf_get_dynamic_info (main_map, false, false); |
4d098554 FW |
1638 | |
1639 | /* If the main map is libc.so, update the base namespace to | |
1640 | refer to this map. If libc.so is loaded later, this happens | |
1641 | in _dl_map_object_from_fd. */ | |
1642 | if (main_map->l_info[DT_SONAME] != NULL | |
1643 | && (strcmp (((const char *) D_PTR (main_map, l_info[DT_STRTAB]) | |
1644 | + main_map->l_info[DT_SONAME]->d_un.d_val), LIBC_SO) | |
1645 | == 0)) | |
1646 | GL(dl_ns)[LM_ID_BASE].libc_map = main_map; | |
1647 | ||
efec5079 | 1648 | /* Set up our cache of pointers into the hash table. */ |
c0f62c56 | 1649 | _dl_setup_hash (main_map); |
9a51759b | 1650 | } |
0200214b | 1651 | |
2bf9e641 | 1652 | if (__glibc_unlikely (state.mode == rtld_mode_verify)) |
e2102c14 UD |
1653 | { |
1654 | /* We were called just to verify that this is a dynamic | |
1655 | executable using us as the program interpreter. Exit with an | |
1656 | error if we were not able to load the binary or no interpreter | |
1657 | is specified (i.e., this is no dynamically linked binary. */ | |
c0f62c56 | 1658 | if (main_map->l_ld == NULL) |
e2102c14 | 1659 | _exit (1); |
e2102c14 UD |
1660 | |
1661 | /* We allow here some platform specific code. */ | |
1662 | #ifdef DISTINGUISH_LIB_VERSIONS | |
1663 | DISTINGUISH_LIB_VERSIONS; | |
1664 | #endif | |
eb406346 | 1665 | _exit (has_interp ? 0 : 2); |
e2102c14 UD |
1666 | } |
1667 | ||
ab1d521d | 1668 | struct link_map **first_preload = &GL(dl_rtld_map).l_next; |
ab1d521d RM |
1669 | /* Set up the data structures for the system-supplied DSO early, |
1670 | so they can influence _dl_init_paths. */ | |
9cee5585 | 1671 | setup_vdso (main_map, &first_preload); |
ab1d521d | 1672 | |
1bdda52f AZ |
1673 | /* With vDSO setup we can initialize the function pointers. */ |
1674 | setup_vdso_pointers (); | |
1675 | ||
ab1d521d | 1676 | #ifdef DL_SYSDEP_OSCHECK |
ceb809dc | 1677 | DL_SYSDEP_OSCHECK (_dl_fatal_printf); |
ab1d521d RM |
1678 | #endif |
1679 | ||
1680 | /* Initialize the data structures for the search paths for shared | |
1681 | objects. */ | |
2bf9e641 | 1682 | call_init_paths (&state); |
97a51d8a | 1683 | |
a93d9e03 | 1684 | /* Initialize _r_debug_extended. */ |
29f97654 UD |
1685 | struct r_debug *r = _dl_debug_initialize (GL(dl_rtld_map).l_addr, |
1686 | LM_ID_BASE); | |
9dcafc55 UD |
1687 | r->r_state = RT_CONSISTENT; |
1688 | ||
0200214b | 1689 | /* Put the link_map for ourselves on the chain so it can be found by |
ceb2d9aa | 1690 | name. Note that at this point the global chain of link maps contains |
d6b5d570 UD |
1691 | exactly one element, which is pointed to by dl_loaded. */ |
1692 | if (! GL(dl_rtld_map).l_name) | |
ffee1316 RM |
1693 | /* If not invoked directly, the dynamic linker shared object file was |
1694 | found by the PT_INTERP name. */ | |
d6b5d570 UD |
1695 | GL(dl_rtld_map).l_name = (char *) GL(dl_rtld_map).l_libname->name; |
1696 | GL(dl_rtld_map).l_type = lt_library; | |
c0f62c56 UD |
1697 | main_map->l_next = &GL(dl_rtld_map); |
1698 | GL(dl_rtld_map).l_prev = main_map; | |
1699 | ++GL(dl_ns)[LM_ID_BASE]._ns_nloaded; | |
e8ed861d | 1700 | ++GL(dl_load_adds); |
0200214b | 1701 | |
97fd3a30 UD |
1702 | /* If LD_USE_LOAD_BIAS env variable has not been seen, default |
1703 | to not using bias for non-prelinked PIEs and libraries | |
1704 | and using it for executables or prelinked PIEs or libraries. */ | |
afdca0f2 | 1705 | if (GLRO(dl_use_load_bias) == (ElfW(Addr)) -2) |
c0f62c56 | 1706 | GLRO(dl_use_load_bias) = main_map->l_addr == 0 ? -1 : 0; |
97fd3a30 | 1707 | |
44c4e5d5 RM |
1708 | /* Starting from binutils-2.23, the linker will define the magic symbol |
1709 | __ehdr_start to point to our own ELF header if it is visible in a | |
1710 | segment that also includes the phdrs. If that's not available, we use | |
1711 | the old method that assumes the beginning of the file is part of the | |
1712 | lowest-addressed PT_LOAD segment. */ | |
44c4e5d5 | 1713 | extern const ElfW(Ehdr) __ehdr_start __attribute__ ((visibility ("hidden"))); |
302247c8 FS |
1714 | |
1715 | /* Set up the program header information for the dynamic linker | |
1716 | itself. It is needed in the dl_iterate_phdr callbacks. */ | |
1717 | const ElfW(Ehdr) *rtld_ehdr = &__ehdr_start; | |
44c4e5d5 RM |
1718 | assert (rtld_ehdr->e_ehsize == sizeof *rtld_ehdr); |
1719 | assert (rtld_ehdr->e_phentsize == sizeof (ElfW(Phdr))); | |
1720 | ||
1721 | const ElfW(Phdr) *rtld_phdr = (const void *) rtld_ehdr + rtld_ehdr->e_phoff; | |
1722 | ||
e8ed861d | 1723 | GL(dl_rtld_map).l_phdr = rtld_phdr; |
553eca26 UD |
1724 | GL(dl_rtld_map).l_phnum = rtld_ehdr->e_phnum; |
1725 | ||
9dcafc55 | 1726 | |
e8ed861d UD |
1727 | /* PT_GNU_RELRO is usually the last phdr. */ |
1728 | size_t cnt = rtld_ehdr->e_phnum; | |
1729 | while (cnt-- > 0) | |
1730 | if (rtld_phdr[cnt].p_type == PT_GNU_RELRO) | |
1731 | { | |
1732 | GL(dl_rtld_map).l_relro_addr = rtld_phdr[cnt].p_vaddr; | |
1733 | GL(dl_rtld_map).l_relro_size = rtld_phdr[cnt].p_memsz; | |
1734 | break; | |
1735 | } | |
1736 | ||
9dcafc55 UD |
1737 | /* Add the dynamic linker to the TLS list if it also uses TLS. */ |
1738 | if (GL(dl_rtld_map).l_tls_blocksize != 0) | |
1739 | /* Assign a module ID. Do this before loading any audit modules. */ | |
ba33937b | 1740 | _dl_assign_tls_modid (&GL(dl_rtld_map)); |
9dcafc55 | 1741 | |
2bf9e641 FW |
1742 | audit_list_add_dynamic_tag (&state.audit_list, main_map, DT_AUDIT); |
1743 | audit_list_add_dynamic_tag (&state.audit_list, main_map, DT_DEPAUDIT); | |
8f7a75d7 | 1744 | |
e0f1a58f FW |
1745 | /* At this point, all data has been obtained that is included in the |
1746 | --help output. */ | |
1747 | if (__glibc_unlikely (state.mode == rtld_mode_help)) | |
1748 | _dl_help (ld_so_name, &state); | |
1749 | ||
9dcafc55 | 1750 | /* If we have auditing DSOs to load, do it now. */ |
81b82fb9 | 1751 | bool need_security_init = true; |
2bf9e641 | 1752 | if (state.audit_list.length > 0) |
9dcafc55 | 1753 | { |
2bf9e641 | 1754 | size_t naudit = audit_list_count (&state.audit_list); |
17796419 | 1755 | |
3abee0b7 UD |
1756 | /* Since we start using the auditing DSOs right away we need to |
1757 | initialize the data structures now. */ | |
17796419 | 1758 | tcbp = init_tls (naudit); |
3abee0b7 | 1759 | |
4c48ef06 UD |
1760 | /* Initialize security features. We need to do it this early |
1761 | since otherwise the constructors of the audit libraries will | |
1762 | use different values (especially the pointer guard) and will | |
1763 | fail later on. */ | |
1764 | security_init (); | |
81b82fb9 | 1765 | need_security_init = false; |
4c48ef06 | 1766 | |
2bf9e641 | 1767 | load_audit_modules (main_map, &state.audit_list); |
17796419 SN |
1768 | |
1769 | /* The count based on audit strings may overestimate the number | |
1770 | of audit modules that got loaded, but not underestimate. */ | |
1771 | assert (GLRO(dl_naudit) <= naudit); | |
9dcafc55 UD |
1772 | } |
1773 | ||
d0503676 CD |
1774 | /* Keep track of the currently loaded modules to count how many |
1775 | non-audit modules which use TLS are loaded. */ | |
1776 | size_t count_modids = _dl_count_modids (); | |
1777 | ||
c63d8f80 UD |
1778 | /* Set up debugging before the debugger is notified for the first time. */ |
1779 | #ifdef ELF_MACHINE_DEBUG_SETUP | |
1780 | /* Some machines (e.g. MIPS) don't use DT_DEBUG in this way. */ | |
1781 | ELF_MACHINE_DEBUG_SETUP (main_map, r); | |
c63d8f80 UD |
1782 | #else |
1783 | if (main_map->l_info[DT_DEBUG] != NULL) | |
1784 | /* There is a DT_DEBUG entry in the dynamic section. Fill it in | |
1785 | with the run-time address of the r_debug structure */ | |
1786 | main_map->l_info[DT_DEBUG]->d_un.d_ptr = (ElfW(Addr)) r; | |
c63d8f80 UD |
1787 | #endif |
1788 | ||
9dcafc55 UD |
1789 | /* We start adding objects. */ |
1790 | r->r_state = RT_ADD; | |
1791 | _dl_debug_state (); | |
815e6fa3 | 1792 | LIBC_PROBE (init_start, 2, LM_ID_BASE, r); |
9dcafc55 UD |
1793 | |
1794 | /* Auditing checkpoint: we are ready to signal that the initial map | |
1795 | is being constructed. */ | |
3dac3959 | 1796 | _dl_audit_activity_map (main_map, LA_ACT_ADD); |
9dcafc55 | 1797 | |
14bab8de | 1798 | /* We have two ways to specify objects to preload: via environment |
49c091e5 | 1799 | variable and via the file /etc/ld.so.preload. The latter can also |
14bab8de | 1800 | be used when security is enabled. */ |
ab1d521d | 1801 | assert (*first_preload == NULL); |
20fe49b9 UD |
1802 | struct link_map **preloads = NULL; |
1803 | unsigned int npreloads = 0; | |
14bab8de | 1804 | |
2bf9e641 | 1805 | if (__glibc_unlikely (state.preloadlist != NULL)) |
c4029823 | 1806 | { |
1e372ded AZ |
1807 | RTLD_TIMING_VAR (start); |
1808 | rtld_timer_start (&start); | |
2bf9e641 FW |
1809 | npreloads += handle_preload_list (state.preloadlist, main_map, |
1810 | "LD_PRELOAD"); | |
1e372ded | 1811 | rtld_timer_accum (&load_time, start); |
8692ebdb DN |
1812 | } |
1813 | ||
2bf9e641 | 1814 | if (__glibc_unlikely (state.preloadarg != NULL)) |
8692ebdb | 1815 | { |
1e372ded AZ |
1816 | RTLD_TIMING_VAR (start); |
1817 | rtld_timer_start (&start); | |
2bf9e641 FW |
1818 | npreloads += handle_preload_list (state.preloadarg, main_map, |
1819 | "--preload"); | |
1e372ded | 1820 | rtld_timer_accum (&load_time, start); |
c4029823 UD |
1821 | } |
1822 | ||
761490a1 UD |
1823 | /* There usually is no ld.so.preload file, it should only be used |
1824 | for emergencies and testing. So the open call etc should usually | |
1825 | fail. Using access() on a non-existing file is faster than using | |
1826 | open(). So we do this first. If it succeeds we do almost twice | |
1827 | the work but this does not matter, since it is not for production | |
1828 | use. */ | |
1829 | static const char preload_file[] = "/etc/ld.so.preload"; | |
a1ffb40e | 1830 | if (__glibc_unlikely (__access (preload_file, R_OK) == 0)) |
14bab8de | 1831 | { |
761490a1 UD |
1832 | /* Read the contents of the file. */ |
1833 | file = _dl_sysdep_read_whole_file (preload_file, &file_size, | |
1834 | PROT_READ | PROT_WRITE); | |
a1ffb40e | 1835 | if (__glibc_unlikely (file != MAP_FAILED)) |
14bab8de | 1836 | { |
761490a1 UD |
1837 | /* Parse the file. It contains names of libraries to be loaded, |
1838 | separated by white spaces or `:'. It may also contain | |
1839 | comments introduced by `#'. */ | |
1840 | char *problem; | |
1841 | char *runp; | |
1842 | size_t rest; | |
1843 | ||
1844 | /* Eliminate comments. */ | |
e2102c14 | 1845 | runp = file; |
761490a1 UD |
1846 | rest = file_size; |
1847 | while (rest > 0) | |
1848 | { | |
1849 | char *comment = memchr (runp, '#', rest); | |
1850 | if (comment == NULL) | |
1851 | break; | |
1852 | ||
1853 | rest -= comment - runp; | |
1854 | do | |
1855 | *comment = ' '; | |
1856 | while (--rest > 0 && *++comment != '\n'); | |
1857 | } | |
1858 | ||
1859 | /* We have one problematic case: if we have a name at the end of | |
1860 | the file without a trailing terminating characters, we cannot | |
1861 | place the \0. Handle the case separately. */ | |
1862 | if (file[file_size - 1] != ' ' && file[file_size - 1] != '\t' | |
1863 | && file[file_size - 1] != '\n' && file[file_size - 1] != ':') | |
1864 | { | |
1865 | problem = &file[file_size]; | |
1866 | while (problem > file && problem[-1] != ' ' | |
1867 | && problem[-1] != '\t' | |
1868 | && problem[-1] != '\n' && problem[-1] != ':') | |
1869 | --problem; | |
1870 | ||
1871 | if (problem > file) | |
1872 | problem[-1] = '\0'; | |
1873 | } | |
1874 | else | |
1875 | { | |
1876 | problem = NULL; | |
1877 | file[file_size - 1] = '\0'; | |
1878 | } | |
f04b9a68 | 1879 | |
1e372ded AZ |
1880 | RTLD_TIMING_VAR (start); |
1881 | rtld_timer_start (&start); | |
f04b9a68 | 1882 | |
761490a1 UD |
1883 | if (file != problem) |
1884 | { | |
1885 | char *p; | |
1886 | runp = file; | |
1887 | while ((p = strsep (&runp, ": \t\n")) != NULL) | |
1888 | if (p[0] != '\0') | |
20fe49b9 | 1889 | npreloads += do_preload (p, main_map, preload_file); |
761490a1 UD |
1890 | } |
1891 | ||
1892 | if (problem != NULL) | |
1893 | { | |
1894 | char *p = strndupa (problem, file_size - (problem - file)); | |
20fe49b9 UD |
1895 | |
1896 | npreloads += do_preload (p, main_map, preload_file); | |
761490a1 | 1897 | } |
14bab8de | 1898 | |
1e372ded | 1899 | rtld_timer_accum (&load_time, start); |
db276fa1 | 1900 | |
761490a1 UD |
1901 | /* We don't need the file anymore. */ |
1902 | __munmap (file, file_size); | |
1903 | } | |
14bab8de UD |
1904 | } |
1905 | ||
a1ffb40e | 1906 | if (__glibc_unlikely (*first_preload != NULL)) |
14bab8de UD |
1907 | { |
1908 | /* Set up PRELOADS with a vector of the preloaded libraries. */ | |
ab1d521d | 1909 | struct link_map *l = *first_preload; |
14bab8de | 1910 | preloads = __alloca (npreloads * sizeof preloads[0]); |
14bab8de UD |
1911 | i = 0; |
1912 | do | |
1913 | { | |
1914 | preloads[i++] = l; | |
1915 | l = l->l_next; | |
1916 | } while (l); | |
1917 | assert (i == npreloads); | |
1918 | } | |
1919 | ||
f0e23d34 AZ |
1920 | #ifdef NEED_DL_SYSINFO_DSO |
1921 | /* Now that the audit modules are opened, call la_objopen for the vDSO. */ | |
1922 | if (GLRO(dl_sysinfo_map) != NULL) | |
1923 | _dl_audit_objopen (GLRO(dl_sysinfo_map), LM_ID_BASE); | |
1924 | #endif | |
1925 | ||
2064087b RM |
1926 | /* Load all the libraries specified by DT_NEEDED entries. If LD_PRELOAD |
1927 | specified some libraries to load, these are inserted before the actual | |
1928 | dependencies in the executable's searchlist for symbol resolution. */ | |
1e372ded AZ |
1929 | { |
1930 | RTLD_TIMING_VAR (start); | |
1931 | rtld_timer_start (&start); | |
2bf9e641 FW |
1932 | _dl_map_object_deps (main_map, preloads, npreloads, |
1933 | state.mode == rtld_mode_trace, 0); | |
1e372ded AZ |
1934 | rtld_timer_accum (&load_time, start); |
1935 | } | |
e3e35cfc | 1936 | |
20fe49b9 | 1937 | /* Mark all objects as being in the global scope. */ |
c0f62c56 | 1938 | for (i = main_map->l_searchlist.r_nlist; i > 0; ) |
20fe49b9 | 1939 | main_map->l_searchlist.r_list[--i]->l_global = 1; |
d66e34cd | 1940 | |
f9496a7b | 1941 | /* Remove _dl_rtld_map from the chain. */ |
d6b5d570 | 1942 | GL(dl_rtld_map).l_prev->l_next = GL(dl_rtld_map).l_next; |
20fe49b9 | 1943 | if (GL(dl_rtld_map).l_next != NULL) |
d6b5d570 | 1944 | GL(dl_rtld_map).l_next->l_prev = GL(dl_rtld_map).l_prev; |
f9496a7b | 1945 | |
20fe49b9 UD |
1946 | for (i = 1; i < main_map->l_searchlist.r_nlist; ++i) |
1947 | if (main_map->l_searchlist.r_list[i] == &GL(dl_rtld_map)) | |
1948 | break; | |
1949 | ||
1950 | bool rtld_multiple_ref = false; | |
a1ffb40e | 1951 | if (__glibc_likely (i < main_map->l_searchlist.r_nlist)) |
0200214b | 1952 | { |
f9496a7b RM |
1953 | /* Some DT_NEEDED entry referred to the interpreter object itself, so |
1954 | put it back in the list of visible objects. We insert it into the | |
1955 | chain in symbol search order because gdb uses the chain's order as | |
1956 | its symbol search order. */ | |
20fe49b9 UD |
1957 | rtld_multiple_ref = true; |
1958 | ||
c0f62c56 | 1959 | GL(dl_rtld_map).l_prev = main_map->l_searchlist.r_list[i - 1]; |
2bf9e641 | 1960 | if (__glibc_likely (state.mode == rtld_mode_normal)) |
3b3ddb4f | 1961 | { |
c0f62c56 UD |
1962 | GL(dl_rtld_map).l_next = (i + 1 < main_map->l_searchlist.r_nlist |
1963 | ? main_map->l_searchlist.r_list[i + 1] | |
3b3ddb4f | 1964 | : NULL); |
7775448e | 1965 | #ifdef NEED_DL_SYSINFO_DSO |
ab1d521d RM |
1966 | if (GLRO(dl_sysinfo_map) != NULL |
1967 | && GL(dl_rtld_map).l_prev->l_next == GLRO(dl_sysinfo_map) | |
1968 | && GL(dl_rtld_map).l_next != GLRO(dl_sysinfo_map)) | |
1969 | GL(dl_rtld_map).l_prev = GLRO(dl_sysinfo_map); | |
3b3ddb4f UD |
1970 | #endif |
1971 | } | |
b2bcd61a UD |
1972 | else |
1973 | /* In trace mode there might be an invisible object (which we | |
1974 | could not find) after the previous one in the search list. | |
1975 | In this case it doesn't matter much where we put the | |
1976 | interpreter object, so we just initialize the list pointer so | |
1977 | that the assertion below holds. */ | |
d6b5d570 | 1978 | GL(dl_rtld_map).l_next = GL(dl_rtld_map).l_prev->l_next; |
b2bcd61a | 1979 | |
d6b5d570 UD |
1980 | assert (GL(dl_rtld_map).l_prev->l_next == GL(dl_rtld_map).l_next); |
1981 | GL(dl_rtld_map).l_prev->l_next = &GL(dl_rtld_map); | |
3fb55878 | 1982 | if (GL(dl_rtld_map).l_next != NULL) |
f9496a7b | 1983 | { |
d6b5d570 UD |
1984 | assert (GL(dl_rtld_map).l_next->l_prev == GL(dl_rtld_map).l_prev); |
1985 | GL(dl_rtld_map).l_next->l_prev = &GL(dl_rtld_map); | |
f9496a7b | 1986 | } |
0200214b | 1987 | } |
d66e34cd | 1988 | |
c84142e8 UD |
1989 | /* Now let us see whether all libraries are available in the |
1990 | versions we need. */ | |
1991 | { | |
993b3242 | 1992 | struct version_check_args args; |
2bf9e641 FW |
1993 | args.doexit = state.mode == rtld_mode_normal; |
1994 | args.dotrace = state.mode == rtld_mode_trace; | |
993b3242 | 1995 | _dl_receive_error (print_missing_version, version_check_doit, &args); |
c84142e8 UD |
1996 | } |
1997 | ||
2d148689 RM |
1998 | /* We do not initialize any of the TLS functionality unless any of the |
1999 | initial modules uses TLS. This makes dynamic loading of modules with | |
2000 | TLS impossible, but to support it requires either eagerly doing setup | |
2001 | now or lazily doing it later. Doing it now makes us incompatible with | |
2002 | an old kernel that can't perform TLS_INIT_TP, even if no TLS is ever | |
2003 | used. Trying to do it lazily is too hairy to try when there could be | |
2004 | multiple threads (from a non-TLS-using libpthread). */ | |
9dcafc55 | 2005 | bool was_tls_init_tp_called = tls_init_tp_called; |
35f1e827 | 2006 | if (tcbp == NULL) |
17796419 | 2007 | tcbp = init_tls (0); |
0ecb606c | 2008 | |
81b82fb9 | 2009 | if (__glibc_likely (need_security_init)) |
4c48ef06 UD |
2010 | /* Initialize security features. But only if we have not done it |
2011 | earlier. */ | |
2012 | security_init (); | |
827b7087 | 2013 | |
2bf9e641 | 2014 | if (__glibc_unlikely (state.mode != rtld_mode_normal)) |
0200214b RM |
2015 | { |
2016 | /* We were run just to list the shared libraries. It is | |
2017 | important that we do this before real relocation, because the | |
2018 | functions we call below for output may no longer work properly | |
2019 | after relocation. */ | |
81f3ac4c UD |
2020 | struct link_map *l; |
2021 | ||
afdca0f2 | 2022 | if (GLRO(dl_debug_mask) & DL_DEBUG_PRELINK) |
ceb2d9aa | 2023 | { |
c0f62c56 | 2024 | struct r_scope_elem *scope = &main_map->l_searchlist; |
ceb2d9aa | 2025 | |
81f3ac4c | 2026 | for (i = 0; i < scope->r_nlist; i++) |
32e6df36 | 2027 | { |
81f3ac4c UD |
2028 | l = scope->r_list [i]; |
2029 | if (l->l_faked) | |
32e6df36 | 2030 | { |
81f3ac4c UD |
2031 | _dl_printf ("\t%s => not found\n", l->l_libname->name); |
2032 | continue; | |
2033 | } | |
afdca0f2 UD |
2034 | if (_dl_name_match_p (GLRO(dl_trace_prelink), l)) |
2035 | GLRO(dl_trace_prelink_map) = l; | |
81f3ac4c | 2036 | _dl_printf ("\t%s => %s (0x%0*Zx, 0x%0*Zx)", |
b9375348 SP |
2037 | DSO_FILENAME (l->l_libname->name), |
2038 | DSO_FILENAME (l->l_name), | |
d347a4ab UD |
2039 | (int) sizeof l->l_map_start * 2, |
2040 | (size_t) l->l_map_start, | |
2041 | (int) sizeof l->l_addr * 2, | |
2042 | (size_t) l->l_addr); | |
11bf311e | 2043 | |
81f3ac4c UD |
2044 | if (l->l_tls_modid) |
2045 | _dl_printf (" TLS(0x%Zx, 0x%0*Zx)\n", l->l_tls_modid, | |
2046 | (int) sizeof l->l_tls_offset * 2, | |
d347a4ab | 2047 | (size_t) l->l_tls_offset); |
81f3ac4c | 2048 | else |
81f3ac4c | 2049 | _dl_printf ("\n"); |
32e6df36 | 2050 | } |
ceb2d9aa | 2051 | } |
7a11603d UD |
2052 | else if (GLRO(dl_debug_mask) & DL_DEBUG_UNUSED) |
2053 | { | |
2054 | /* Look through the dependencies of the main executable | |
2055 | and determine which of them is not actually | |
2056 | required. */ | |
c0f62c56 | 2057 | struct link_map *l = main_map; |
7a11603d UD |
2058 | |
2059 | /* Relocate the main executable. */ | |
2ca285b0 | 2060 | struct relocate_args args = { .l = l, |
3a62d00d AS |
2061 | .reloc_mode = ((GLRO(dl_lazy) |
2062 | ? RTLD_LAZY : 0) | |
2063 | | __RTLD_NOIFUNC) }; | |
7a11603d UD |
2064 | _dl_receive_error (print_unresolved, relocate_doit, &args); |
2065 | ||
2066 | /* This loop depends on the dependencies of the executable to | |
2067 | correspond in number and order to the DT_NEEDED entries. */ | |
c0f62c56 | 2068 | ElfW(Dyn) *dyn = main_map->l_ld; |
7a11603d UD |
2069 | bool first = true; |
2070 | while (dyn->d_tag != DT_NULL) | |
2071 | { | |
2072 | if (dyn->d_tag == DT_NEEDED) | |
2073 | { | |
2074 | l = l->l_next; | |
7775448e | 2075 | #ifdef NEED_DL_SYSINFO_DSO |
ff9f1c5f DM |
2076 | /* Skip the VDSO since it's not part of the list |
2077 | of objects we brought in via DT_NEEDED entries. */ | |
2078 | if (l == GLRO(dl_sysinfo_map)) | |
2079 | l = l->l_next; | |
2080 | #endif | |
7a11603d UD |
2081 | if (!l->l_used) |
2082 | { | |
2083 | if (first) | |
2084 | { | |
2085 | _dl_printf ("Unused direct dependencies:\n"); | |
2086 | first = false; | |
2087 | } | |
2088 | ||
2089 | _dl_printf ("\t%s\n", l->l_name); | |
2090 | } | |
2091 | } | |
2092 | ||
2093 | ++dyn; | |
2094 | } | |
2095 | ||
2096 | _exit (first != true); | |
2097 | } | |
c0f62c56 | 2098 | else if (! main_map->l_info[DT_NEEDED]) |
81f3ac4c UD |
2099 | _dl_printf ("\tstatically linked\n"); |
2100 | else | |
2101 | { | |
c0f62c56 | 2102 | for (l = main_map->l_next; l; l = l->l_next) |
81f3ac4c UD |
2103 | if (l->l_faked) |
2104 | /* The library was not found. */ | |
2105 | _dl_printf ("\t%s => not found\n", l->l_libname->name); | |
75489693 | 2106 | else if (strcmp (l->l_libname->name, l->l_name) == 0) |
7a11603d UD |
2107 | _dl_printf ("\t%s (0x%0*Zx)\n", l->l_libname->name, |
2108 | (int) sizeof l->l_map_start * 2, | |
2109 | (size_t) l->l_map_start); | |
81f3ac4c UD |
2110 | else |
2111 | _dl_printf ("\t%s => %s (0x%0*Zx)\n", l->l_libname->name, | |
2112 | l->l_name, (int) sizeof l->l_map_start * 2, | |
d347a4ab | 2113 | (size_t) l->l_map_start); |
81f3ac4c | 2114 | } |
1a3a58fd | 2115 | |
2bf9e641 | 2116 | if (__glibc_unlikely (state.mode != rtld_mode_trace)) |
5a47e7f2 | 2117 | for (i = 1; i < (unsigned int) _dl_argc; ++i) |
cddcfecf RM |
2118 | { |
2119 | const ElfW(Sym) *ref = NULL; | |
c0282c06 UD |
2120 | ElfW(Addr) loadbase; |
2121 | lookup_t result; | |
c0282c06 | 2122 | |
4243cbea | 2123 | result = _dl_lookup_symbol_x (_dl_argv[i], main_map, |
11bf311e UD |
2124 | &ref, main_map->l_scope, |
2125 | NULL, ELF_RTYPE_CLASS_PLT, | |
021723ab | 2126 | DL_LOOKUP_ADD_DEPENDENCY, NULL); |
c0282c06 | 2127 | |
10a446dd | 2128 | loadbase = LOOKUP_VALUE_ADDRESS (result, false); |
c0282c06 | 2129 | |
35fc382a | 2130 | _dl_printf ("%s found at 0x%0*Zd in object at 0x%0*Zd\n", |
4243cbea | 2131 | _dl_argv[i], |
d347a4ab UD |
2132 | (int) sizeof ref->st_value * 2, |
2133 | (size_t) ref->st_value, | |
2134 | (int) sizeof loadbase * 2, (size_t) loadbase); | |
cddcfecf | 2135 | } |
ce37fa88 | 2136 | else |
fd26970f | 2137 | { |
20fe49b9 | 2138 | /* If LD_WARN is set, warn about undefined symbols. */ |
afdca0f2 | 2139 | if (GLRO(dl_lazy) >= 0 && GLRO(dl_verbose)) |
ce37fa88 UD |
2140 | { |
2141 | /* We have to do symbol dependency testing. */ | |
2142 | struct relocate_args args; | |
48b67d71 | 2143 | unsigned int i; |
993b3242 | 2144 | |
3a62d00d AS |
2145 | args.reloc_mode = ((GLRO(dl_lazy) ? RTLD_LAZY : 0) |
2146 | | __RTLD_NOIFUNC); | |
fd26970f | 2147 | |
48b67d71 AS |
2148 | i = main_map->l_searchlist.r_nlist; |
2149 | while (i-- > 0) | |
ce37fa88 | 2150 | { |
48b67d71 | 2151 | struct link_map *l = main_map->l_initfini[i]; |
d6b5d570 | 2152 | if (l != &GL(dl_rtld_map) && ! l->l_faked) |
ce37fa88 UD |
2153 | { |
2154 | args.l = l; | |
2155 | _dl_receive_error (print_unresolved, relocate_doit, | |
2156 | &args); | |
ce37fa88 | 2157 | } |
20fe49b9 | 2158 | } |
32e6df36 | 2159 | |
afdca0f2 | 2160 | if ((GLRO(dl_debug_mask) & DL_DEBUG_PRELINK) |
20fe49b9 | 2161 | && rtld_multiple_ref) |
e38c954b UD |
2162 | { |
2163 | /* Mark the link map as not yet relocated again. */ | |
2164 | GL(dl_rtld_map).l_relocated = 0; | |
11bf311e | 2165 | _dl_relocate_object (&GL(dl_rtld_map), |
3a62d00d | 2166 | main_map->l_scope, __RTLD_NOIFUNC, 0); |
e38c954b | 2167 | } |
3a56ea26 | 2168 | } |
b0982c4a | 2169 | #define VERNEEDTAG (DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGIDX (DT_VERNEED)) |
2bf9e641 | 2170 | if (state.version_info) |
fd26970f | 2171 | { |
ce37fa88 UD |
2172 | /* Print more information. This means here, print information |
2173 | about the versions needed. */ | |
2174 | int first = 1; | |
c0f62c56 | 2175 | struct link_map *map; |
ce37fa88 | 2176 | |
c0f62c56 | 2177 | for (map = main_map; map != NULL; map = map->l_next) |
fd26970f | 2178 | { |
f41c8091 | 2179 | const char *strtab; |
ce37fa88 | 2180 | ElfW(Dyn) *dyn = map->l_info[VERNEEDTAG]; |
f41c8091 UD |
2181 | ElfW(Verneed) *ent; |
2182 | ||
2183 | if (dyn == NULL) | |
2184 | continue; | |
2185 | ||
a42195db | 2186 | strtab = (const void *) D_PTR (map, l_info[DT_STRTAB]); |
f41c8091 | 2187 | ent = (ElfW(Verneed) *) (map->l_addr + dyn->d_un.d_ptr); |
ce37fa88 | 2188 | |
f41c8091 | 2189 | if (first) |
ce37fa88 | 2190 | { |
35fc382a | 2191 | _dl_printf ("\n\tVersion information:\n"); |
f41c8091 UD |
2192 | first = 0; |
2193 | } | |
ce37fa88 | 2194 | |
b9375348 | 2195 | _dl_printf ("\t%s:\n", DSO_FILENAME (map->l_name)); |
f41c8091 UD |
2196 | |
2197 | while (1) | |
2198 | { | |
2199 | ElfW(Vernaux) *aux; | |
2200 | struct link_map *needed; | |
ce37fa88 | 2201 | |
f41c8091 UD |
2202 | needed = find_needed (strtab + ent->vn_file); |
2203 | aux = (ElfW(Vernaux) *) ((char *) ent + ent->vn_aux); | |
ce37fa88 UD |
2204 | |
2205 | while (1) | |
2206 | { | |
f41c8091 UD |
2207 | const char *fname = NULL; |
2208 | ||
f41c8091 | 2209 | if (needed != NULL |
ba9fcb3f UD |
2210 | && match_version (strtab + aux->vna_name, |
2211 | needed)) | |
f41c8091 UD |
2212 | fname = needed->l_name; |
2213 | ||
35fc382a UD |
2214 | _dl_printf ("\t\t%s (%s) %s=> %s\n", |
2215 | strtab + ent->vn_file, | |
2216 | strtab + aux->vna_name, | |
2217 | aux->vna_flags & VER_FLG_WEAK | |
2218 | ? "[WEAK] " : "", | |
2219 | fname ?: "not found"); | |
ce37fa88 | 2220 | |
f41c8091 UD |
2221 | if (aux->vna_next == 0) |
2222 | /* No more symbols. */ | |
ce37fa88 UD |
2223 | break; |
2224 | ||
f41c8091 UD |
2225 | /* Next symbol. */ |
2226 | aux = (ElfW(Vernaux) *) ((char *) aux | |
2227 | + aux->vna_next); | |
ce37fa88 | 2228 | } |
f41c8091 UD |
2229 | |
2230 | if (ent->vn_next == 0) | |
2231 | /* No more dependencies. */ | |
2232 | break; | |
2233 | ||
2234 | /* Next dependency. */ | |
2235 | ent = (ElfW(Verneed) *) ((char *) ent + ent->vn_next); | |
ce37fa88 | 2236 | } |
fd26970f | 2237 | } |
ce37fa88 | 2238 | } |
fd26970f | 2239 | } |
d66e34cd | 2240 | |
0200214b RM |
2241 | _exit (0); |
2242 | } | |
86d2c878 | 2243 | |
c0f62c56 | 2244 | if (main_map->l_info[ADDRIDX (DT_GNU_LIBLIST)] |
768027a4 UD |
2245 | && ! __builtin_expect (GLRO(dl_profile) != NULL, 0) |
2246 | && ! __builtin_expect (GLRO(dl_dynamic_weak), 0)) | |
32e6df36 UD |
2247 | { |
2248 | ElfW(Lib) *liblist, *liblistend; | |
2249 | struct link_map **r_list, **r_listend, *l; | |
c0f62c56 | 2250 | const char *strtab = (const void *) D_PTR (main_map, l_info[DT_STRTAB]); |
32e6df36 | 2251 | |
c0f62c56 | 2252 | assert (main_map->l_info[VALIDX (DT_GNU_LIBLISTSZ)] != NULL); |
32e6df36 | 2253 | liblist = (ElfW(Lib) *) |
c0f62c56 | 2254 | main_map->l_info[ADDRIDX (DT_GNU_LIBLIST)]->d_un.d_ptr; |
32e6df36 | 2255 | liblistend = (ElfW(Lib) *) |
34a5a146 JM |
2256 | ((char *) liblist |
2257 | + main_map->l_info[VALIDX (DT_GNU_LIBLISTSZ)]->d_un.d_val); | |
c0f62c56 UD |
2258 | r_list = main_map->l_searchlist.r_list; |
2259 | r_listend = r_list + main_map->l_searchlist.r_nlist; | |
32e6df36 UD |
2260 | |
2261 | for (; r_list < r_listend && liblist < liblistend; r_list++) | |
2262 | { | |
2263 | l = *r_list; | |
2264 | ||
c0f62c56 | 2265 | if (l == main_map) |
32e6df36 UD |
2266 | continue; |
2267 | ||
2268 | /* If the library is not mapped where it should, fail. */ | |
2269 | if (l->l_addr) | |
2270 | break; | |
2271 | ||
2272 | /* Next, check if checksum matches. */ | |
2273 | if (l->l_info [VALIDX(DT_CHECKSUM)] == NULL | |
2274 | || l->l_info [VALIDX(DT_CHECKSUM)]->d_un.d_val | |
2275 | != liblist->l_checksum) | |
2276 | break; | |
2277 | ||
2278 | if (l->l_info [VALIDX(DT_GNU_PRELINKED)] == NULL | |
2279 | || l->l_info [VALIDX(DT_GNU_PRELINKED)]->d_un.d_val | |
2280 | != liblist->l_time_stamp) | |
2281 | break; | |
2282 | ||
2283 | if (! _dl_name_match_p (strtab + liblist->l_name, l)) | |
2284 | break; | |
2285 | ||
2286 | ++liblist; | |
2287 | } | |
2288 | ||
2289 | ||
2290 | if (r_list == r_listend && liblist == liblistend) | |
164a7164 | 2291 | prelinked = true; |
32e6df36 | 2292 | |
a1ffb40e | 2293 | if (__glibc_unlikely (GLRO(dl_debug_mask) & DL_DEBUG_LIBS)) |
b85a0f39 UD |
2294 | _dl_debug_printf ("\nprelink checking: %s\n", |
2295 | prelinked ? "ok" : "failed"); | |
32e6df36 UD |
2296 | } |
2297 | ||
ed20b3d9 | 2298 | |
c31e278f | 2299 | /* Now set up the variable which helps the assembler startup code. */ |
c0f62c56 | 2300 | GL(dl_ns)[LM_ID_BASE]._ns_main_searchlist = &main_map->l_searchlist; |
c31e278f UD |
2301 | |
2302 | /* Save the information about the original global scope list since | |
2303 | we need it in the memory handling later. */ | |
c0f62c56 | 2304 | GLRO(dl_initial_searchlist) = *GL(dl_ns)[LM_ID_BASE]._ns_main_searchlist; |
c31e278f | 2305 | |
e23fe25b | 2306 | /* Remember the last search directory added at startup, now that |
8e1472d2 FW |
2307 | malloc will no longer be the one from dl-minimal.c. As a side |
2308 | effect, this marks ld.so as initialized, so that the rtld_active | |
2309 | function returns true from now on. */ | |
e23fe25b AS |
2310 | GLRO(dl_init_all_dirs) = GL(dl_all_dirs); |
2311 | ||
73d7af4f | 2312 | /* Print scope information. */ |
a1ffb40e | 2313 | if (__glibc_unlikely (GLRO(dl_debug_mask) & DL_DEBUG_SCOPES)) |
73d7af4f UD |
2314 | { |
2315 | _dl_debug_printf ("\nInitial object scopes\n"); | |
2316 | ||
2317 | for (struct link_map *l = main_map; l != NULL; l = l->l_next) | |
174baab3 | 2318 | _dl_show_scope (l, 0); |
73d7af4f UD |
2319 | } |
2320 | ||
f753fa7d L |
2321 | _rtld_main_check (main_map, _dl_argv[0]); |
2322 | ||
32e6df36 UD |
2323 | if (prelinked) |
2324 | { | |
c0f62c56 | 2325 | if (main_map->l_info [ADDRIDX (DT_GNU_CONFLICT)] != NULL) |
32e6df36 UD |
2326 | { |
2327 | ElfW(Rela) *conflict, *conflictend; | |
32e6df36 | 2328 | |
1e372ded AZ |
2329 | RTLD_TIMING_VAR (start); |
2330 | rtld_timer_start (&start); | |
2331 | ||
c0f62c56 | 2332 | assert (main_map->l_info [VALIDX (DT_GNU_CONFLICTSZ)] != NULL); |
32e6df36 | 2333 | conflict = (ElfW(Rela) *) |
c0f62c56 | 2334 | main_map->l_info [ADDRIDX (DT_GNU_CONFLICT)]->d_un.d_ptr; |
32e6df36 | 2335 | conflictend = (ElfW(Rela) *) |
d89ae1d5 | 2336 | ((char *) conflict |
c0f62c56 UD |
2337 | + main_map->l_info [VALIDX (DT_GNU_CONFLICTSZ)]->d_un.d_val); |
2338 | _dl_resolve_conflicts (main_map, conflict, conflictend); | |
1e372ded AZ |
2339 | |
2340 | rtld_timer_stop (&relocate_time, start); | |
32e6df36 UD |
2341 | } |
2342 | ||
5d28a896 FW |
2343 | /* Set up the object lookup structures. */ |
2344 | _dl_find_object_init (); | |
2345 | ||
3a0ecccb FW |
2346 | /* The library defining malloc has already been relocated due to |
2347 | prelinking. Resolve the malloc symbols for the dynamic | |
2348 | loader. */ | |
2349 | __rtld_malloc_init_real (main_map); | |
d89ae1d5 | 2350 | |
d6163dfd FW |
2351 | /* Likewise for the locking implementation. */ |
2352 | __rtld_mutex_init (); | |
2353 | ||
d89ae1d5 | 2354 | /* Mark all the objects so we know they have been already relocated. */ |
9dcafc55 | 2355 | for (struct link_map *l = main_map; l != NULL; l = l->l_next) |
e8648a5a UD |
2356 | { |
2357 | l->l_relocated = 1; | |
2358 | if (l->l_relro_size) | |
2359 | _dl_protect_relro (l); | |
9dcafc55 UD |
2360 | |
2361 | /* Add object to slot information data if necessasy. */ | |
2362 | if (l->l_tls_blocksize != 0 && tls_init_tp_called) | |
a509eb11 | 2363 | _dl_add_to_slotinfo (l, true); |
e8648a5a | 2364 | } |
32e6df36 UD |
2365 | } |
2366 | else | |
164a7164 UD |
2367 | { |
2368 | /* Now we have all the objects loaded. Relocate them all except for | |
2369 | the dynamic linker itself. We do this in reverse order so that copy | |
2370 | relocs of earlier objects overwrite the data written by later | |
2371 | objects. We do not re-relocate the dynamic linker itself in this | |
2372 | loop because that could result in the GOT entries for functions we | |
2373 | call being changed, and that would break us. It is safe to relocate | |
2374 | the dynamic linker out of order because it has no copy relocs (we | |
2375 | know that because it is self-contained). */ | |
2376 | ||
afdca0f2 | 2377 | int consider_profiling = GLRO(dl_profile) != NULL; |
c0fb8a56 | 2378 | |
164a7164 | 2379 | /* If we are profiling we also must do lazy reloaction. */ |
afdca0f2 | 2380 | GLRO(dl_lazy) |= consider_profiling; |
c0fb8a56 | 2381 | |
1e372ded AZ |
2382 | RTLD_TIMING_VAR (start); |
2383 | rtld_timer_start (&start); | |
2bc17433 AS |
2384 | unsigned i = main_map->l_searchlist.r_nlist; |
2385 | while (i-- > 0) | |
164a7164 | 2386 | { |
2bc17433 AS |
2387 | struct link_map *l = main_map->l_initfini[i]; |
2388 | ||
164a7164 UD |
2389 | /* While we are at it, help the memory handling a bit. We have to |
2390 | mark some data structures as allocated with the fake malloc() | |
2391 | implementation in ld.so. */ | |
2392 | struct libname_list *lnp = l->l_libname->next; | |
752a2a50 | 2393 | |
164a7164 UD |
2394 | while (__builtin_expect (lnp != NULL, 0)) |
2395 | { | |
2396 | lnp->dont_free = 1; | |
2397 | lnp = lnp->next; | |
2398 | } | |
0479b305 AS |
2399 | /* Also allocated with the fake malloc(). */ |
2400 | l->l_free_initfini = 0; | |
752a2a50 | 2401 | |
164a7164 | 2402 | if (l != &GL(dl_rtld_map)) |
2ca285b0 | 2403 | _dl_relocate_object (l, l->l_scope, GLRO(dl_lazy) ? RTLD_LAZY : 0, |
154d10bd | 2404 | consider_profiling); |
be935610 | 2405 | |
9dcafc55 UD |
2406 | /* Add object to slot information data if necessasy. */ |
2407 | if (l->l_tls_blocksize != 0 && tls_init_tp_called) | |
a509eb11 | 2408 | _dl_add_to_slotinfo (l, true); |
164a7164 | 2409 | } |
1e372ded | 2410 | rtld_timer_stop (&relocate_time, start); |
164a7164 | 2411 | |
164a7164 UD |
2412 | /* Now enable profiling if needed. Like the previous call, |
2413 | this has to go here because the calls it makes should use the | |
2414 | rtld versions of the functions (particularly calloc()), but it | |
2415 | needs to have _dl_profile_map set up by the relocator. */ | |
a1ffb40e | 2416 | if (__glibc_unlikely (GL(dl_profile_map) != NULL)) |
164a7164 | 2417 | /* We must prepare the profiling. */ |
53bfdc1c | 2418 | _dl_start_profile (); |
164a7164 | 2419 | } |
ac16e905 | 2420 | |
d0503676 CD |
2421 | if ((!was_tls_init_tp_called && GL(dl_tls_max_dtv_idx) > 0) |
2422 | || count_modids != _dl_count_modids ()) | |
35f1e827 | 2423 | ++GL(dl_tls_generation); |
9dcafc55 | 2424 | |
35f1e827 UD |
2425 | /* Now that we have completed relocation, the initializer data |
2426 | for the TLS blocks has its final values and we can copy them | |
91ac3a7d TMQMF |
2427 | into the main thread's TLS area, which we allocated above. |
2428 | Note: thread-local variables must only be accessed after completing | |
2429 | the next step. */ | |
35f1e827 | 2430 | _dl_allocate_tls_init (tcbp); |
a334319f | 2431 | |
3d8c8bff | 2432 | /* And finally install it for the main thread. */ |
35f1e827 UD |
2433 | if (! tls_init_tp_called) |
2434 | { | |
774f9285 | 2435 | const char *lossage = TLS_INIT_TP (tcbp); |
a1ffb40e | 2436 | if (__glibc_unlikely (lossage != NULL)) |
35f1e827 UD |
2437 | _dl_fatal_printf ("cannot set up thread-local storage: %s\n", |
2438 | lossage); | |
90d7e7e5 | 2439 | __tls_init_tp (); |
0ecb606c | 2440 | } |
0ecb606c | 2441 | |
e23fe25b AS |
2442 | /* Make sure no new search directories have been added. */ |
2443 | assert (GLRO(dl_init_all_dirs) == GL(dl_all_dirs)); | |
bc5fb037 | 2444 | |
cafdfdb6 RM |
2445 | if (! prelinked && rtld_multiple_ref) |
2446 | { | |
2447 | /* There was an explicit ref to the dynamic linker as a shared lib. | |
2448 | Re-relocate ourselves with user-controlled symbol definitions. | |
2449 | ||
2450 | We must do this after TLS initialization in case after this | |
2451 | re-relocation, we might call a user-supplied function | |
2452 | (e.g. calloc from _dl_relocate_object) that uses TLS data. */ | |
2453 | ||
5d28a896 FW |
2454 | /* Set up the object lookup structures. */ |
2455 | _dl_find_object_init (); | |
2456 | ||
3a0ecccb FW |
2457 | /* The malloc implementation has been relocated, so resolving |
2458 | its symbols (and potentially calling IFUNC resolvers) is safe | |
2459 | at this point. */ | |
2460 | __rtld_malloc_init_real (main_map); | |
2461 | ||
d6163dfd FW |
2462 | /* Likewise for the locking implementation. */ |
2463 | __rtld_mutex_init (); | |
2464 | ||
1e372ded AZ |
2465 | RTLD_TIMING_VAR (start); |
2466 | rtld_timer_start (&start); | |
cafdfdb6 | 2467 | |
cafdfdb6 RM |
2468 | /* Mark the link map as not yet relocated again. */ |
2469 | GL(dl_rtld_map).l_relocated = 0; | |
c0a777e8 | 2470 | _dl_relocate_object (&GL(dl_rtld_map), main_map->l_scope, 0, 0); |
1e372ded AZ |
2471 | |
2472 | rtld_timer_accum (&relocate_time, start); | |
cafdfdb6 RM |
2473 | } |
2474 | ||
03e187a4 FW |
2475 | /* Relocation is complete. Perform early libc initialization. This |
2476 | is the initial libc, even if audit modules have been loaded with | |
2477 | other libcs. */ | |
2478 | _dl_call_libc_early_init (GL(dl_ns)[LM_ID_BASE].libc_map, true); | |
ec935dea | 2479 | |
bf8523c8 RM |
2480 | /* Do any necessary cleanups for the startup OS interface code. |
2481 | We do these now so that no calls are made after rtld re-relocation | |
2482 | which might be resolved to different functions than we expect. | |
2483 | We cannot do this before relocating the other objects because | |
2484 | _dl_relocate_object might need to call `mprotect' for DT_TEXTREL. */ | |
2485 | _dl_sysdep_start_cleanup (); | |
2486 | ||
9dcafc55 UD |
2487 | #ifdef SHARED |
2488 | /* Auditing checkpoint: we have added all objects. */ | |
3dac3959 | 2489 | _dl_audit_activity_nsid (LM_ID_BASE, LA_ACT_CONSISTENT); |
9dcafc55 UD |
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 | } |