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d66e34cd | 1 | /* Run time dynamic linker. |
d614a753 | 2 | Copyright (C) 1995-2020 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> |
f5348425 | 35 | #include "dynamic-link.h" |
8f480b4b | 36 | #include <dl-librecon.h> |
74955460 | 37 | #include <unsecvars.h> |
5688da55 | 38 | #include <dl-cache.h> |
2f4db0df | 39 | #include <dl-osinfo.h> |
5688da55 | 40 | #include <dl-procinfo.h> |
f753fa7d | 41 | #include <dl-prop.h> |
1bdda52f AZ |
42 | #include <dl-vdso.h> |
43 | #include <dl-vdso-setup.h> | |
5f5843e3 | 44 | #include <tls.h> |
815e6fa3 | 45 | #include <stap-probe.h> |
30950a5f | 46 | #include <stackinfo.h> |
329ea513 | 47 | #include <not-cancel.h> |
f5348425 | 48 | |
a853022c | 49 | #include <assert.h> |
f5348425 | 50 | |
1e372ded AZ |
51 | /* Only enables rtld profiling for architectures which provides non generic |
52 | hp-timing support. The generic support requires either syscall | |
53 | (clock_gettime), which will incur in extra overhead on loading time. | |
54 | Using vDSO is also an option, but it will require extra support on loader | |
55 | to setup the vDSO pointer before its usage. */ | |
56 | #if HP_TIMING_INLINE | |
57 | # define RLTD_TIMING_DECLARE(var, classifier,...) \ | |
58 | classifier hp_timing_t var __VA_ARGS__ | |
59 | # define RTLD_TIMING_VAR(var) RLTD_TIMING_DECLARE (var, ) | |
60 | # define RTLD_TIMING_SET(var, value) (var) = (value) | |
61 | # define RTLD_TIMING_REF(var) &(var) | |
62 | ||
63 | static inline void | |
64 | rtld_timer_start (hp_timing_t *var) | |
65 | { | |
66 | HP_TIMING_NOW (*var); | |
67 | } | |
68 | ||
69 | static inline void | |
70 | rtld_timer_stop (hp_timing_t *var, hp_timing_t start) | |
71 | { | |
72 | hp_timing_t stop; | |
73 | HP_TIMING_NOW (stop); | |
74 | HP_TIMING_DIFF (*var, start, stop); | |
75 | } | |
76 | ||
77 | static inline void | |
78 | rtld_timer_accum (hp_timing_t *sum, hp_timing_t start) | |
79 | { | |
80 | hp_timing_t stop; | |
81 | rtld_timer_stop (&stop, start); | |
82 | HP_TIMING_ACCUM_NT(*sum, stop); | |
83 | } | |
84 | #else | |
85 | # define RLTD_TIMING_DECLARE(var, classifier...) | |
86 | # define RTLD_TIMING_SET(var, value) | |
87 | # define RTLD_TIMING_VAR(var) | |
88 | # define RTLD_TIMING_REF(var) 0 | |
89 | # define rtld_timer_start(var) | |
90 | # define rtld_timer_stop(var, start) | |
91 | # define rtld_timer_accum(sum, start) | |
92 | #endif | |
93 | ||
6ce3881d RM |
94 | /* Avoid PLT use for our local calls at startup. */ |
95 | extern __typeof (__mempcpy) __mempcpy attribute_hidden; | |
96 | ||
97 | /* GCC has mental blocks about _exit. */ | |
98 | extern __typeof (_exit) exit_internal asm ("_exit") attribute_hidden; | |
99 | #define _exit exit_internal | |
100 | ||
fd26970f | 101 | /* Helper function to handle errors while resolving symbols. */ |
c84142e8 UD |
102 | static void print_unresolved (int errcode, const char *objname, |
103 | const char *errsting); | |
104 | ||
105 | /* Helper function to handle errors when a version is missing. */ | |
106 | static void print_missing_version (int errcode, const char *objname, | |
107 | const char *errsting); | |
fd26970f | 108 | |
db276fa1 | 109 | /* Print the various times we collected. */ |
1e372ded | 110 | static void print_statistics (const hp_timing_t *total_timep); |
ea278354 | 111 | |
74780cf6 UD |
112 | /* Add audit objects. */ |
113 | static void process_dl_audit (char *str); | |
114 | ||
ea278354 UD |
115 | /* This is a list of all the modes the dynamic loader can be in. */ |
116 | enum mode { normal, list, verify, trace }; | |
117 | ||
118 | /* Process all environments variables the dynamic linker must recognize. | |
119 | Since all of them start with `LD_' we are a bit smarter while finding | |
120 | all the entries. */ | |
ba9fcb3f | 121 | static void process_envvars (enum mode *modep); |
ea278354 | 122 | |
11986c68 | 123 | #ifdef DL_ARGV_NOT_RELRO |
22aa06a5 | 124 | int _dl_argc attribute_hidden; |
11986c68 | 125 | char **_dl_argv = NULL; |
22aa06a5 RM |
126 | /* Nonzero if we were run directly. */ |
127 | unsigned int _dl_skip_args attribute_hidden; | |
11986c68 | 128 | #else |
22aa06a5 | 129 | int _dl_argc attribute_relro attribute_hidden; |
697afbe1 | 130 | char **_dl_argv attribute_relro = NULL; |
22aa06a5 | 131 | unsigned int _dl_skip_args attribute_relro attribute_hidden; |
11986c68 | 132 | #endif |
4243cbea | 133 | rtld_hidden_data_def (_dl_argv) |
5c82e15e | 134 | |
35f1e827 UD |
135 | #ifndef THREAD_SET_STACK_GUARD |
136 | /* Only exported for architectures that don't store the stack guard canary | |
137 | in thread local area. */ | |
138 | uintptr_t __stack_chk_guard attribute_relro; | |
139 | #endif | |
140 | ||
827b7087 UD |
141 | /* Only exported for architectures that don't store the pointer guard |
142 | value in thread local area. */ | |
143 | uintptr_t __pointer_chk_guard_local | |
144 | attribute_relro attribute_hidden __attribute__ ((nocommon)); | |
145 | #ifndef THREAD_SET_POINTER_GUARD | |
146 | strong_alias (__pointer_chk_guard_local, __pointer_chk_guard) | |
147 | #endif | |
148 | ||
6d0ba622 FW |
149 | /* Length limits for names and paths, to protect the dynamic linker, |
150 | particularly when __libc_enable_secure is active. */ | |
151 | #ifdef NAME_MAX | |
152 | # define SECURE_NAME_LIMIT NAME_MAX | |
153 | #else | |
154 | # define SECURE_NAME_LIMIT 255 | |
155 | #endif | |
156 | #ifdef PATH_MAX | |
157 | # define SECURE_PATH_LIMIT PATH_MAX | |
158 | #else | |
159 | # define SECURE_PATH_LIMIT 1024 | |
160 | #endif | |
161 | ||
162 | /* Check that AT_SECURE=0, or that the passed name does not contain | |
163 | directories and is not overly long. Reject empty names | |
164 | unconditionally. */ | |
165 | static bool | |
166 | dso_name_valid_for_suid (const char *p) | |
167 | { | |
168 | if (__glibc_unlikely (__libc_enable_secure)) | |
169 | { | |
170 | /* Ignore pathnames with directories for AT_SECURE=1 | |
171 | programs, and also skip overlong names. */ | |
172 | size_t len = strlen (p); | |
173 | if (len >= SECURE_NAME_LIMIT || memchr (p, '/', len) != NULL) | |
174 | return false; | |
175 | } | |
176 | return *p != '\0'; | |
177 | } | |
827b7087 | 178 | |
81b82fb9 FW |
179 | /* LD_AUDIT variable contents. Must be processed before the |
180 | audit_list below. */ | |
181 | const char *audit_list_string; | |
182 | ||
183 | /* Cyclic list of auditing DSOs. audit_list->next is the first | |
184 | element. */ | |
9dcafc55 UD |
185 | static struct audit_list |
186 | { | |
187 | const char *name; | |
188 | struct audit_list *next; | |
189 | } *audit_list; | |
190 | ||
81b82fb9 FW |
191 | /* Iterator for audit_list_string followed by audit_list. */ |
192 | struct audit_list_iter | |
193 | { | |
194 | /* Tail of audit_list_string still needing processing, or NULL. */ | |
195 | const char *audit_list_tail; | |
196 | ||
197 | /* The list element returned in the previous iteration. NULL before | |
198 | the first element. */ | |
199 | struct audit_list *previous; | |
200 | ||
201 | /* Scratch buffer for returning a name which is part of | |
202 | audit_list_string. */ | |
203 | char fname[SECURE_NAME_LIMIT]; | |
204 | }; | |
205 | ||
206 | /* Initialize an audit list iterator. */ | |
207 | static void | |
208 | audit_list_iter_init (struct audit_list_iter *iter) | |
209 | { | |
210 | iter->audit_list_tail = audit_list_string; | |
211 | iter->previous = NULL; | |
212 | } | |
213 | ||
214 | /* Iterate through both audit_list_string and audit_list. */ | |
215 | static const char * | |
216 | audit_list_iter_next (struct audit_list_iter *iter) | |
217 | { | |
218 | if (iter->audit_list_tail != NULL) | |
219 | { | |
220 | /* First iterate over audit_list_string. */ | |
221 | while (*iter->audit_list_tail != '\0') | |
222 | { | |
223 | /* Split audit list at colon. */ | |
224 | size_t len = strcspn (iter->audit_list_tail, ":"); | |
225 | if (len > 0 && len < sizeof (iter->fname)) | |
226 | { | |
227 | memcpy (iter->fname, iter->audit_list_tail, len); | |
228 | iter->fname[len] = '\0'; | |
229 | } | |
230 | else | |
231 | /* Do not return this name to the caller. */ | |
232 | iter->fname[0] = '\0'; | |
233 | ||
234 | /* Skip over the substring and the following delimiter. */ | |
235 | iter->audit_list_tail += len; | |
236 | if (*iter->audit_list_tail == ':') | |
237 | ++iter->audit_list_tail; | |
238 | ||
239 | /* If the name is valid, return it. */ | |
240 | if (dso_name_valid_for_suid (iter->fname)) | |
241 | return iter->fname; | |
242 | /* Otherwise, wrap around and try the next name. */ | |
243 | } | |
244 | /* Fall through to the procesing of audit_list. */ | |
245 | } | |
246 | ||
247 | if (iter->previous == NULL) | |
248 | { | |
249 | if (audit_list == NULL) | |
250 | /* No pre-parsed audit list. */ | |
251 | return NULL; | |
252 | /* Start of audit list. The first list element is at | |
253 | audit_list->next (cyclic list). */ | |
254 | iter->previous = audit_list->next; | |
255 | return iter->previous->name; | |
256 | } | |
257 | if (iter->previous == audit_list) | |
258 | /* Cyclic list wrap-around. */ | |
259 | return NULL; | |
260 | iter->previous = iter->previous->next; | |
261 | return iter->previous->name; | |
262 | } | |
263 | ||
ce6e047f | 264 | #ifndef HAVE_INLINED_SYSCALLS |
39778c6c UD |
265 | /* Set nonzero during loading and initialization of executable and |
266 | libraries, cleared before the executable's entry point runs. This | |
267 | must not be initialized to nonzero, because the unused dynamic | |
268 | linker loaded in for libc.so's "ld.so.1" dep will provide the | |
269 | definition seen by libc.so's initializer; that value must be zero, | |
270 | and will be since that dynamic linker's _dl_start and dl_main will | |
271 | never be called. */ | |
e6caf4e1 | 272 | int _dl_starting_up = 0; |
9cf27b8d | 273 | rtld_hidden_def (_dl_starting_up) |
ce6e047f | 274 | #endif |
39778c6c | 275 | |
d6b5d570 UD |
276 | /* This is the structure which defines all variables global to ld.so |
277 | (except those which cannot be added for some reason). */ | |
5688da55 UD |
278 | struct rtld_global _rtld_global = |
279 | { | |
30950a5f RA |
280 | /* Generally the default presumption without further information is an |
281 | * executable stack but this is not true for all platforms. */ | |
282 | ._dl_stack_flags = DEFAULT_STACK_PERMS, | |
ffa8d2a0 | 283 | #ifdef _LIBC_REENTRANT |
22c83193 | 284 | ._dl_load_lock = _RTLD_LOCK_RECURSIVE_INITIALIZER, |
5a2a1d75 | 285 | ._dl_load_write_lock = _RTLD_LOCK_RECURSIVE_INITIALIZER, |
ffa8d2a0 | 286 | #endif |
415ac3df UD |
287 | ._dl_nns = 1, |
288 | ._dl_ns = | |
289 | { | |
bea9b193 | 290 | #ifdef _LIBC_REENTRANT |
415ac3df UD |
291 | [LM_ID_BASE] = { ._ns_unique_sym_table |
292 | = { .lock = _RTLD_LOCK_RECURSIVE_INITIALIZER } } | |
bea9b193 | 293 | #endif |
415ac3df | 294 | } |
5688da55 | 295 | }; |
27a754a9 UD |
296 | /* If we would use strong_alias here the compiler would see a |
297 | non-hidden definition. This would undo the effect of the previous | |
298 | declaration. So spell out was strong_alias does plus add the | |
299 | visibility attribute. */ | |
300 | extern struct rtld_global _rtld_local | |
301 | __attribute__ ((alias ("_rtld_global"), visibility ("hidden"))); | |
c0fb8a56 | 302 | |
afdca0f2 UD |
303 | |
304 | /* This variable is similar to _rtld_local, but all values are | |
305 | read-only after relocation. */ | |
306 | struct rtld_global_ro _rtld_global_ro attribute_relro = | |
307 | { | |
c31e278f UD |
308 | /* Get architecture specific initializer. */ |
309 | #include <dl-procinfo.c> | |
afdca0f2 UD |
310 | #ifdef NEED_DL_SYSINFO |
311 | ._dl_sysinfo = DL_SYSINFO_DEFAULT, | |
312 | #endif | |
dd70526e | 313 | ._dl_debug_fd = STDERR_FILENO, |
afdca0f2 UD |
314 | ._dl_use_load_bias = -2, |
315 | ._dl_correct_cache_id = _DL_CACHE_DEFAULT_ID, | |
ff08fc59 | 316 | #if !HAVE_TUNABLES |
afdca0f2 | 317 | ._dl_hwcap_mask = HWCAP_IMPORTANT, |
ff08fc59 | 318 | #endif |
afdca0f2 UD |
319 | ._dl_lazy = 1, |
320 | ._dl_fpu_control = _FPU_DEFAULT, | |
02d46fc4 | 321 | ._dl_pagesize = EXEC_PAGESIZE, |
73d65cc3 | 322 | ._dl_inhibit_cache = 0, |
154d10bd UD |
323 | |
324 | /* Function pointers. */ | |
154d10bd | 325 | ._dl_debug_printf = _dl_debug_printf, |
ab97ee8f | 326 | ._dl_mcount = _dl_mcount, |
021723ab | 327 | ._dl_lookup_symbol_x = _dl_lookup_symbol_x, |
9dcafc55 | 328 | ._dl_open = _dl_open, |
93025f93 | 329 | ._dl_close = _dl_close, |
7c22c7ec UD |
330 | ._dl_tls_get_addr_soft = _dl_tls_get_addr_soft, |
331 | #ifdef HAVE_DL_DISCOVER_OSVERSION | |
332 | ._dl_discover_osversion = _dl_discover_osversion | |
333 | #endif | |
afdca0f2 UD |
334 | }; |
335 | /* If we would use strong_alias here the compiler would see a | |
336 | non-hidden definition. This would undo the effect of the previous | |
337 | declaration. So spell out was strong_alias does plus add the | |
338 | visibility attribute. */ | |
339 | extern struct rtld_global_ro _rtld_local_ro | |
340 | __attribute__ ((alias ("_rtld_global_ro"), visibility ("hidden"))); | |
341 | ||
342 | ||
67ddea92 | 343 | static void dl_main (const ElfW(Phdr) *phdr, ElfW(Word) phnum, |
3a56ea26 | 344 | ElfW(Addr) *user_entry, ElfW(auxv_t) *auxv); |
d66e34cd | 345 | |
392a6b52 | 346 | /* These two variables cannot be moved into .data.rel.ro. */ |
d6b5d570 UD |
347 | static struct libname_list _dl_rtld_libname; |
348 | static struct libname_list _dl_rtld_libname2; | |
86d2c878 | 349 | |
db276fa1 | 350 | /* Variable for statistics. */ |
1e372ded AZ |
351 | RLTD_TIMING_DECLARE (relocate_time, static); |
352 | RLTD_TIMING_DECLARE (load_time, static, attribute_relro); | |
353 | RLTD_TIMING_DECLARE (start_time, static, attribute_relro); | |
db276fa1 | 354 | |
2a76f7ef UD |
355 | /* Additional definitions needed by TLS initialization. */ |
356 | #ifdef TLS_INIT_HELPER | |
357 | TLS_INIT_HELPER | |
5e289179 UD |
358 | #endif |
359 | ||
360 | /* Helper function for syscall implementation. */ | |
361 | #ifdef DL_SYSINFO_IMPLEMENTATION | |
362 | DL_SYSINFO_IMPLEMENTATION | |
2a76f7ef UD |
363 | #endif |
364 | ||
01d8e36d UD |
365 | /* Before ld.so is relocated we must not access variables which need |
366 | relocations. This means variables which are exported. Variables | |
367 | declared as static are fine. If we can mark a variable hidden this | |
27a754a9 | 368 | is fine, too. The latter is important here. We can avoid setting |
01d8e36d UD |
369 | up a temporary link map for ld.so if we can mark _rtld_global as |
370 | hidden. */ | |
11bf311e | 371 | #ifdef PI_STATIC_AND_HIDDEN |
01d8e36d UD |
372 | # define DONT_USE_BOOTSTRAP_MAP 1 |
373 | #endif | |
374 | ||
375 | #ifdef DONT_USE_BOOTSTRAP_MAP | |
376 | static ElfW(Addr) _dl_start_final (void *arg); | |
377 | #else | |
4874b009 RM |
378 | struct dl_start_final_info |
379 | { | |
380 | struct link_map l; | |
1e372ded | 381 | RTLD_TIMING_VAR (start_time); |
4874b009 | 382 | }; |
01d8e36d | 383 | static ElfW(Addr) _dl_start_final (void *arg, |
4874b009 | 384 | struct dl_start_final_info *info); |
01d8e36d | 385 | #endif |
6a1db4ff | 386 | |
65da9563 RM |
387 | /* These defined magically in the linker script. */ |
388 | extern char _begin[] attribute_hidden; | |
eec8b6ca | 389 | extern char _etext[] attribute_hidden; |
65da9563 RM |
390 | extern char _end[] attribute_hidden; |
391 | ||
392 | ||
b1dbbaa4 RM |
393 | #ifdef RTLD_START |
394 | RTLD_START | |
395 | #else | |
eaad82e0 | 396 | # error "sysdeps/MACHINE/dl-machine.h fails to define RTLD_START" |
b1dbbaa4 RM |
397 | #endif |
398 | ||
c2248c44 RM |
399 | /* This is the second half of _dl_start (below). It can be inlined safely |
400 | under DONT_USE_BOOTSTRAP_MAP, where it is careful not to make any GOT | |
401 | references. When the tools don't permit us to avoid using a GOT entry | |
402 | for _dl_rtld_global (no attribute_hidden support), we must make sure | |
403 | this function is not inlined (see below). */ | |
404 | ||
405 | #ifdef DONT_USE_BOOTSTRAP_MAP | |
406 | static inline ElfW(Addr) __attribute__ ((always_inline)) | |
407 | _dl_start_final (void *arg) | |
408 | #else | |
409 | static ElfW(Addr) __attribute__ ((noinline)) | |
4874b009 | 410 | _dl_start_final (void *arg, struct dl_start_final_info *info) |
c2248c44 RM |
411 | #endif |
412 | { | |
413 | ElfW(Addr) start_addr; | |
c2248c44 | 414 | |
1e372ded AZ |
415 | /* If it hasn't happen yet record the startup time. */ |
416 | rtld_timer_start (&start_time); | |
417 | #if !defined DONT_USE_BOOTSTRAP_MAP | |
418 | RTLD_TIMING_SET (start_time, info->start_time); | |
4874b009 | 419 | #endif |
c2248c44 RM |
420 | |
421 | /* Transfer data about ourselves to the permanent link_map structure. */ | |
422 | #ifndef DONT_USE_BOOTSTRAP_MAP | |
4874b009 RM |
423 | GL(dl_rtld_map).l_addr = info->l.l_addr; |
424 | GL(dl_rtld_map).l_ld = info->l.l_ld; | |
425 | memcpy (GL(dl_rtld_map).l_info, info->l.l_info, | |
c2248c44 | 426 | sizeof GL(dl_rtld_map).l_info); |
4874b009 | 427 | GL(dl_rtld_map).l_mach = info->l.l_mach; |
82221992 | 428 | GL(dl_rtld_map).l_relocated = 1; |
c2248c44 RM |
429 | #endif |
430 | _dl_setup_hash (&GL(dl_rtld_map)); | |
c0f62c56 | 431 | GL(dl_rtld_map).l_real = &GL(dl_rtld_map); |
c2248c44 RM |
432 | GL(dl_rtld_map).l_map_start = (ElfW(Addr)) _begin; |
433 | GL(dl_rtld_map).l_map_end = (ElfW(Addr)) _end; | |
eec8b6ca | 434 | GL(dl_rtld_map).l_text_end = (ElfW(Addr)) _etext; |
c2248c44 | 435 | /* Copy the TLS related data if necessary. */ |
11bf311e | 436 | #ifndef DONT_USE_BOOTSTRAP_MAP |
3d8c8bff | 437 | # if NO_TLS_OFFSET != 0 |
299601a1 | 438 | GL(dl_rtld_map).l_tls_offset = NO_TLS_OFFSET; |
c2248c44 | 439 | # endif |
c2248c44 RM |
440 | #endif |
441 | ||
ea4f25a7 UD |
442 | /* Initialize the stack end variable. */ |
443 | __libc_stack_end = __builtin_frame_address (0); | |
444 | ||
c2248c44 RM |
445 | /* Call the OS-dependent function to set up life so we can do things like |
446 | file access. It will call `dl_main' (below) to do all the real work | |
447 | of the dynamic linker, and then unwind our frame and run the user | |
448 | entry point on the same stack we entered on. */ | |
ecdeaac0 | 449 | start_addr = _dl_sysdep_start (arg, &dl_main); |
c2248c44 | 450 | |
a1ffb40e | 451 | if (__glibc_unlikely (GLRO(dl_debug_mask) & DL_DEBUG_STATISTICS)) |
39b04aa3 | 452 | { |
1e372ded AZ |
453 | RTLD_TIMING_VAR (rtld_total_time); |
454 | rtld_timer_stop (&rtld_total_time, start_time); | |
455 | print_statistics (RTLD_TIMING_REF(rtld_total_time)); | |
39b04aa3 | 456 | } |
c2248c44 RM |
457 | |
458 | return start_addr; | |
459 | } | |
460 | ||
630bf491 | 461 | static ElfW(Addr) __attribute_used__ |
d66e34cd RM |
462 | _dl_start (void *arg) |
463 | { | |
01d8e36d UD |
464 | #ifdef DONT_USE_BOOTSTRAP_MAP |
465 | # define bootstrap_map GL(dl_rtld_map) | |
466 | #else | |
4874b009 RM |
467 | struct dl_start_final_info info; |
468 | # define bootstrap_map info.l | |
739d440d | 469 | #endif |
d66e34cd | 470 | |
b1dbbaa4 | 471 | /* This #define produces dynamic linking inline functions for |
2f978feb UD |
472 | bootstrap relocation instead of general-purpose relocation. |
473 | Since ld.so must not have any undefined symbols the result | |
474 | is trivial: always the map of ld.so itself. */ | |
b1dbbaa4 | 475 | #define RTLD_BOOTSTRAP |
b8818ab5 L |
476 | #define BOOTSTRAP_MAP (&bootstrap_map) |
477 | #define RESOLVE_MAP(sym, version, flags) BOOTSTRAP_MAP | |
b1dbbaa4 RM |
478 | #include "dynamic-link.h" |
479 | ||
4874b009 | 480 | #ifdef DONT_USE_BOOTSTRAP_MAP |
1e372ded | 481 | rtld_timer_start (&start_time); |
4874b009 | 482 | #else |
1e372ded | 483 | rtld_timer_start (&info.start_time); |
4874b009 | 484 | #endif |
db276fa1 | 485 | |
e66d0a4c UD |
486 | /* Partly clean the `bootstrap_map' structure up. Don't use |
487 | `memset' since it might not be built in or inlined and we cannot | |
488 | make function calls at this point. Use '__builtin_memset' if we | |
01d8e36d UD |
489 | know it is available. We do not have to clear the memory if we |
490 | do not have to use the temporary bootstrap_map. Global variables | |
491 | are initialized to zero by default. */ | |
492 | #ifndef DONT_USE_BOOTSTRAP_MAP | |
493 | # ifdef HAVE_BUILTIN_MEMSET | |
e66d0a4c | 494 | __builtin_memset (bootstrap_map.l_info, '\0', sizeof (bootstrap_map.l_info)); |
01d8e36d | 495 | # else |
ce460d04 | 496 | for (size_t cnt = 0; |
264ec183 UD |
497 | cnt < sizeof (bootstrap_map.l_info) / sizeof (bootstrap_map.l_info[0]); |
498 | ++cnt) | |
499 | bootstrap_map.l_info[cnt] = 0; | |
01d8e36d | 500 | # endif |
e66d0a4c | 501 | #endif |
264ec183 | 502 | |
d66e34cd | 503 | /* Figure out the run-time load address of the dynamic linker itself. */ |
86d2c878 | 504 | bootstrap_map.l_addr = elf_machine_load_address (); |
d66e34cd | 505 | |
47707456 UD |
506 | /* Read our own dynamic section and fill in the info array. */ |
507 | bootstrap_map.l_ld = (void *) bootstrap_map.l_addr + elf_machine_dynamic (); | |
479aa8ec | 508 | elf_get_dynamic_info (&bootstrap_map, NULL); |
d66e34cd | 509 | |
11bf311e | 510 | #if NO_TLS_OFFSET != 0 |
299601a1 UD |
511 | bootstrap_map.l_tls_offset = NO_TLS_OFFSET; |
512 | #endif | |
513 | ||
d66e34cd | 514 | #ifdef ELF_MACHINE_BEFORE_RTLD_RELOC |
86d2c878 | 515 | ELF_MACHINE_BEFORE_RTLD_RELOC (bootstrap_map.l_info); |
d66e34cd RM |
516 | #endif |
517 | ||
32e6df36 UD |
518 | if (bootstrap_map.l_addr || ! bootstrap_map.l_info[VALIDX(DT_GNU_PRELINKED)]) |
519 | { | |
520 | /* Relocate ourselves so we can do normal function calls and | |
521 | data access using the global offset table. */ | |
522 | ||
3a62d00d | 523 | ELF_DYNAMIC_RELOCATE (&bootstrap_map, 0, 0, 0); |
32e6df36 | 524 | } |
f85f3563 | 525 | bootstrap_map.l_relocated = 1; |
421f82e5 | 526 | |
ea7eb7e3 UD |
527 | /* Please note that we don't allow profiling of this object and |
528 | therefore need not test whether we have to allocate the array | |
529 | for the relocation results (as done in dl-reloc.c). */ | |
421f82e5 | 530 | |
d66e34cd RM |
531 | /* Now life is sane; we can call functions and access global data. |
532 | Set up to use the operating system facilities, and find out from | |
533 | the operating system's program loader where to find the program | |
6a1db4ff UD |
534 | header table in core. Put the rest of _dl_start into a separate |
535 | function, that way the compiler cannot put accesses to the GOT | |
536 | before ELF_DYNAMIC_RELOCATE. */ | |
c0282c06 | 537 | { |
01d8e36d UD |
538 | #ifdef DONT_USE_BOOTSTRAP_MAP |
539 | ElfW(Addr) entry = _dl_start_final (arg); | |
540 | #else | |
4874b009 | 541 | ElfW(Addr) entry = _dl_start_final (arg, &info); |
01d8e36d | 542 | #endif |
c0282c06 UD |
543 | |
544 | #ifndef ELF_MACHINE_START_ADDRESS | |
545 | # define ELF_MACHINE_START_ADDRESS(map, start) (start) | |
546 | #endif | |
547 | ||
7cb92a99 | 548 | return ELF_MACHINE_START_ADDRESS (GL(dl_ns)[LM_ID_BASE]._ns_loaded, entry); |
c0282c06 | 549 | } |
6a1db4ff UD |
550 | } |
551 | ||
552 | ||
d66e34cd | 553 | |
d66e34cd RM |
554 | /* Now life is peachy; we can do all normal operations. |
555 | On to the real work. */ | |
556 | ||
993b3242 UD |
557 | /* Some helper functions. */ |
558 | ||
559 | /* Arguments to relocate_doit. */ | |
560 | struct relocate_args | |
561 | { | |
562 | struct link_map *l; | |
2ca285b0 | 563 | int reloc_mode; |
993b3242 UD |
564 | }; |
565 | ||
566 | struct map_args | |
567 | { | |
568 | /* Argument to map_doit. */ | |
acf869f4 | 569 | const char *str; |
f04b9a68 | 570 | struct link_map *loader; |
f04b9a68 | 571 | int mode; |
993b3242 | 572 | /* Return value of map_doit. */ |
f04b9a68 | 573 | struct link_map *map; |
993b3242 UD |
574 | }; |
575 | ||
9dcafc55 UD |
576 | struct dlmopen_args |
577 | { | |
578 | const char *fname; | |
579 | struct link_map *map; | |
580 | }; | |
581 | ||
582 | struct lookup_args | |
583 | { | |
584 | const char *name; | |
585 | struct link_map *map; | |
586 | void *result; | |
587 | }; | |
588 | ||
993b3242 UD |
589 | /* Arguments to version_check_doit. */ |
590 | struct version_check_args | |
591 | { | |
993b3242 | 592 | int doexit; |
145b8413 | 593 | int dotrace; |
993b3242 UD |
594 | }; |
595 | ||
596 | static void | |
597 | relocate_doit (void *a) | |
598 | { | |
599 | struct relocate_args *args = (struct relocate_args *) a; | |
600 | ||
2ca285b0 | 601 | _dl_relocate_object (args->l, args->l->l_scope, args->reloc_mode, 0); |
993b3242 UD |
602 | } |
603 | ||
604 | static void | |
605 | map_doit (void *a) | |
606 | { | |
be935610 | 607 | struct map_args *args = (struct map_args *) a; |
798212a0 PP |
608 | int type = (args->mode == __RTLD_OPENEXEC) ? lt_executable : lt_library; |
609 | args->map = _dl_map_object (args->loader, args->str, type, 0, | |
8e9f92e9 | 610 | args->mode, LM_ID_BASE); |
993b3242 UD |
611 | } |
612 | ||
9dcafc55 UD |
613 | static void |
614 | dlmopen_doit (void *a) | |
615 | { | |
616 | struct dlmopen_args *args = (struct dlmopen_args *) a; | |
8e9f92e9 AS |
617 | args->map = _dl_open (args->fname, |
618 | (RTLD_LAZY | __RTLD_DLOPEN | __RTLD_AUDIT | |
619 | | __RTLD_SECURE), | |
4243cbea | 620 | dl_main, LM_ID_NEWLM, _dl_argc, _dl_argv, |
9dcafc55 UD |
621 | __environ); |
622 | } | |
623 | ||
624 | static void | |
625 | lookup_doit (void *a) | |
626 | { | |
627 | struct lookup_args *args = (struct lookup_args *) a; | |
628 | const ElfW(Sym) *ref = NULL; | |
629 | args->result = NULL; | |
630 | lookup_t l = _dl_lookup_symbol_x (args->name, args->map, &ref, | |
631 | args->map->l_local_scope, NULL, 0, | |
632 | DL_LOOKUP_RETURN_NEWEST, NULL); | |
633 | if (ref != NULL) | |
634 | args->result = DL_SYMBOL_ADDRESS (l, ref); | |
635 | } | |
636 | ||
993b3242 UD |
637 | static void |
638 | version_check_doit (void *a) | |
639 | { | |
be935610 | 640 | struct version_check_args *args = (struct version_check_args *) a; |
c0f62c56 UD |
641 | if (_dl_check_all_versions (GL(dl_ns)[LM_ID_BASE]._ns_loaded, 1, |
642 | args->dotrace) && args->doexit) | |
993b3242 UD |
643 | /* We cannot start the application. Abort now. */ |
644 | _exit (1); | |
645 | } | |
646 | ||
ce37fa88 UD |
647 | |
648 | static inline struct link_map * | |
649 | find_needed (const char *name) | |
650 | { | |
c0f62c56 UD |
651 | struct r_scope_elem *scope = &GL(dl_ns)[LM_ID_BASE]._ns_loaded->l_searchlist; |
652 | unsigned int n = scope->r_nlist; | |
ce37fa88 | 653 | |
be935610 | 654 | while (n-- > 0) |
c0f62c56 UD |
655 | if (_dl_name_match_p (name, scope->r_list[n])) |
656 | return scope->r_list[n]; | |
ce37fa88 UD |
657 | |
658 | /* Should never happen. */ | |
659 | return NULL; | |
660 | } | |
661 | ||
662 | static int | |
663 | match_version (const char *string, struct link_map *map) | |
664 | { | |
a42195db | 665 | const char *strtab = (const void *) D_PTR (map, l_info[DT_STRTAB]); |
ce37fa88 UD |
666 | ElfW(Verdef) *def; |
667 | ||
b0982c4a | 668 | #define VERDEFTAG (DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGIDX (DT_VERDEF)) |
ce37fa88 UD |
669 | if (map->l_info[VERDEFTAG] == NULL) |
670 | /* The file has no symbol versioning. */ | |
671 | return 0; | |
672 | ||
673 | def = (ElfW(Verdef) *) ((char *) map->l_addr | |
674 | + map->l_info[VERDEFTAG]->d_un.d_ptr); | |
675 | while (1) | |
676 | { | |
677 | ElfW(Verdaux) *aux = (ElfW(Verdaux) *) ((char *) def + def->vd_aux); | |
678 | ||
679 | /* Compare the version strings. */ | |
680 | if (strcmp (string, strtab + aux->vda_name) == 0) | |
681 | /* Bingo! */ | |
682 | return 1; | |
683 | ||
684 | /* If no more definitions we failed to find what we want. */ | |
685 | if (def->vd_next == 0) | |
686 | break; | |
687 | ||
688 | /* Next definition. */ | |
689 | def = (ElfW(Verdef) *) ((char *) def + def->vd_next); | |
690 | } | |
691 | ||
692 | return 0; | |
693 | } | |
694 | ||
9dcafc55 UD |
695 | static bool tls_init_tp_called; |
696 | ||
697 | static void * | |
698 | init_tls (void) | |
699 | { | |
700 | /* Number of elements in the static TLS block. */ | |
701 | GL(dl_tls_static_nelem) = GL(dl_tls_max_dtv_idx); | |
702 | ||
703 | /* Do not do this twice. The audit interface might have required | |
704 | the DTV interfaces to be set up early. */ | |
705 | if (GL(dl_initial_dtv) != NULL) | |
706 | return NULL; | |
707 | ||
708 | /* Allocate the array which contains the information about the | |
709 | dtv slots. We allocate a few entries more than needed to | |
710 | avoid the need for reallocation. */ | |
711 | size_t nelem = GL(dl_tls_max_dtv_idx) + 1 + TLS_SLOTINFO_SURPLUS; | |
712 | ||
713 | /* Allocate. */ | |
714 | GL(dl_tls_dtv_slotinfo_list) = (struct dtv_slotinfo_list *) | |
715 | calloc (sizeof (struct dtv_slotinfo_list) | |
716 | + nelem * sizeof (struct dtv_slotinfo), 1); | |
717 | /* No need to check the return value. If memory allocation failed | |
718 | the program would have been terminated. */ | |
719 | ||
720 | struct dtv_slotinfo *slotinfo = GL(dl_tls_dtv_slotinfo_list)->slotinfo; | |
721 | GL(dl_tls_dtv_slotinfo_list)->len = nelem; | |
722 | GL(dl_tls_dtv_slotinfo_list)->next = NULL; | |
723 | ||
724 | /* Fill in the information from the loaded modules. No namespace | |
725 | but the base one can be filled at this time. */ | |
726 | assert (GL(dl_ns)[LM_ID_BASE + 1]._ns_loaded == NULL); | |
727 | int i = 0; | |
728 | for (struct link_map *l = GL(dl_ns)[LM_ID_BASE]._ns_loaded; l != NULL; | |
729 | l = l->l_next) | |
730 | if (l->l_tls_blocksize != 0) | |
731 | { | |
732 | /* This is a module with TLS data. Store the map reference. | |
733 | The generation counter is zero. */ | |
734 | slotinfo[i].map = l; | |
735 | /* slotinfo[i].gen = 0; */ | |
736 | ++i; | |
737 | } | |
738 | assert (i == GL(dl_tls_max_dtv_idx)); | |
739 | ||
740 | /* Compute the TLS offsets for the various blocks. */ | |
741 | _dl_determine_tlsoffset (); | |
742 | ||
743 | /* Construct the static TLS block and the dtv for the initial | |
744 | thread. For some platforms this will include allocating memory | |
745 | for the thread descriptor. The memory for the TLS block will | |
746 | never be freed. It should be allocated accordingly. The dtv | |
747 | array can be changed if dynamic loading requires it. */ | |
748 | void *tcbp = _dl_allocate_tls_storage (); | |
749 | if (tcbp == NULL) | |
750 | _dl_fatal_printf ("\ | |
f648728c | 751 | cannot allocate TLS data structures for initial thread\n"); |
9dcafc55 UD |
752 | |
753 | /* Store for detection of the special case by __tls_get_addr | |
754 | so it knows not to pass this dtv to the normal realloc. */ | |
755 | GL(dl_initial_dtv) = GET_DTV (tcbp); | |
756 | ||
3d8c8bff | 757 | /* And finally install it for the main thread. */ |
774f9285 | 758 | const char *lossage = TLS_INIT_TP (tcbp); |
a1ffb40e | 759 | if (__glibc_unlikely (lossage != NULL)) |
9dcafc55 UD |
760 | _dl_fatal_printf ("cannot set up thread-local storage: %s\n", lossage); |
761 | tls_init_tp_called = true; | |
762 | ||
763 | return tcbp; | |
764 | } | |
9dcafc55 | 765 | |
20fe49b9 | 766 | static unsigned int |
acf869f4 | 767 | do_preload (const char *fname, struct link_map *main_map, const char *where) |
20fe49b9 UD |
768 | { |
769 | const char *objname; | |
770 | const char *err_str = NULL; | |
771 | struct map_args args; | |
74780cf6 | 772 | bool malloced; |
20fe49b9 UD |
773 | |
774 | args.str = fname; | |
775 | args.loader = main_map; | |
8e9f92e9 | 776 | args.mode = __RTLD_SECURE; |
20fe49b9 UD |
777 | |
778 | unsigned int old_nloaded = GL(dl_ns)[LM_ID_BASE]._ns_nloaded; | |
779 | ||
74780cf6 | 780 | (void) _dl_catch_error (&objname, &err_str, &malloced, map_doit, &args); |
a1ffb40e | 781 | if (__glibc_unlikely (err_str != NULL)) |
20fe49b9 UD |
782 | { |
783 | _dl_error_printf ("\ | |
4db5b08f MS |
784 | ERROR: ld.so: object '%s' from %s cannot be preloaded (%s): ignored.\n", |
785 | fname, where, err_str); | |
20fe49b9 UD |
786 | /* No need to call free, this is still before |
787 | the libc's malloc is used. */ | |
788 | } | |
789 | else if (GL(dl_ns)[LM_ID_BASE]._ns_nloaded != old_nloaded) | |
790 | /* It is no duplicate. */ | |
791 | return 1; | |
792 | ||
793 | /* Nothing loaded. */ | |
794 | return 0; | |
795 | } | |
796 | ||
334fcf2a UD |
797 | #if defined SHARED && defined _LIBC_REENTRANT \ |
798 | && defined __rtld_lock_default_lock_recursive | |
20fe49b9 UD |
799 | static void |
800 | rtld_lock_default_lock_recursive (void *lock) | |
334fcf2a UD |
801 | { |
802 | __rtld_lock_default_lock_recursive (lock); | |
803 | } | |
804 | ||
20fe49b9 UD |
805 | static void |
806 | rtld_lock_default_unlock_recursive (void *lock) | |
334fcf2a UD |
807 | { |
808 | __rtld_lock_default_unlock_recursive (lock); | |
809 | } | |
810 | #endif | |
811 | ||
812 | ||
4c48ef06 UD |
813 | static void |
814 | security_init (void) | |
815 | { | |
816 | /* Set up the stack checker's canary. */ | |
965cb60a | 817 | uintptr_t stack_chk_guard = _dl_setup_stack_chk_guard (_dl_random); |
4c48ef06 UD |
818 | #ifdef THREAD_SET_STACK_GUARD |
819 | THREAD_SET_STACK_GUARD (stack_chk_guard); | |
820 | #else | |
821 | __stack_chk_guard = stack_chk_guard; | |
822 | #endif | |
823 | ||
824 | /* Set up the pointer guard as well, if necessary. */ | |
a014cecd FW |
825 | uintptr_t pointer_chk_guard |
826 | = _dl_setup_pointer_guard (_dl_random, stack_chk_guard); | |
4c48ef06 | 827 | #ifdef THREAD_SET_POINTER_GUARD |
a014cecd | 828 | THREAD_SET_POINTER_GUARD (pointer_chk_guard); |
4c48ef06 | 829 | #endif |
a014cecd | 830 | __pointer_chk_guard_local = pointer_chk_guard; |
965cb60a UD |
831 | |
832 | /* We do not need the _dl_random value anymore. The less | |
833 | information we leave behind, the better, so clear the | |
834 | variable. */ | |
835 | _dl_random = NULL; | |
4c48ef06 UD |
836 | } |
837 | ||
1bdda52f | 838 | #include <setup-vdso.h> |
4c48ef06 | 839 | |
392a6b52 UD |
840 | /* The library search path. */ |
841 | static const char *library_path attribute_relro; | |
842 | /* The list preloaded objects. */ | |
843 | static const char *preloadlist attribute_relro; | |
844 | /* Nonzero if information about versions has to be printed. */ | |
845 | static int version_info attribute_relro; | |
8692ebdb DN |
846 | /* The preload list passed as a command argument. */ |
847 | static const char *preloadarg attribute_relro; | |
a1a9d215 | 848 | |
6d0ba622 FW |
849 | /* The LD_PRELOAD environment variable gives list of libraries |
850 | separated by white space or colons that are loaded before the | |
851 | executable's dependencies and prepended to the global scope list. | |
852 | (If the binary is running setuid all elements containing a '/' are | |
853 | ignored since it is insecure.) Return the number of preloads | |
8692ebdb | 854 | performed. Ditto for --preload command argument. */ |
6d0ba622 | 855 | unsigned int |
8692ebdb DN |
856 | handle_preload_list (const char *preloadlist, struct link_map *main_map, |
857 | const char *where) | |
6d0ba622 FW |
858 | { |
859 | unsigned int npreloads = 0; | |
860 | const char *p = preloadlist; | |
861 | char fname[SECURE_PATH_LIMIT]; | |
862 | ||
863 | while (*p != '\0') | |
864 | { | |
865 | /* Split preload list at space/colon. */ | |
866 | size_t len = strcspn (p, " :"); | |
867 | if (len > 0 && len < sizeof (fname)) | |
868 | { | |
869 | memcpy (fname, p, len); | |
870 | fname[len] = '\0'; | |
871 | } | |
872 | else | |
873 | fname[0] = '\0'; | |
874 | ||
875 | /* Skip over the substring and the following delimiter. */ | |
876 | p += len; | |
877 | if (*p != '\0') | |
878 | ++p; | |
879 | ||
880 | if (dso_name_valid_for_suid (fname)) | |
8692ebdb | 881 | npreloads += do_preload (fname, main_map, where); |
6d0ba622 FW |
882 | } |
883 | return npreloads; | |
884 | } | |
885 | ||
3b856d09 FW |
886 | /* Called if the audit DSO cannot be used: if it does not have the |
887 | appropriate interfaces, or it expects a more recent version library | |
888 | version than what the dynamic linker provides. */ | |
889 | static void | |
890 | unload_audit_module (struct link_map *map, int original_tls_idx) | |
891 | { | |
892 | #ifndef NDEBUG | |
893 | Lmid_t ns = map->l_ns; | |
894 | #endif | |
895 | _dl_close (map); | |
896 | ||
897 | /* Make sure the namespace has been cleared entirely. */ | |
898 | assert (GL(dl_ns)[ns]._ns_loaded == NULL); | |
899 | assert (GL(dl_ns)[ns]._ns_nloaded == 0); | |
900 | ||
901 | GL(dl_tls_max_dtv_idx) = original_tls_idx; | |
902 | } | |
903 | ||
904 | /* Called to print an error message if loading of an audit module | |
905 | failed. */ | |
906 | static void | |
907 | report_audit_module_load_error (const char *name, const char *err_str, | |
908 | bool malloced) | |
909 | { | |
910 | _dl_error_printf ("\ | |
911 | ERROR: ld.so: object '%s' cannot be loaded as audit interface: %s; ignored.\n", | |
912 | name, err_str); | |
913 | if (malloced) | |
914 | free ((char *) err_str); | |
915 | } | |
916 | ||
917 | /* Load one audit module. */ | |
918 | static void | |
919 | load_audit_module (const char *name, struct audit_ifaces **last_audit) | |
920 | { | |
921 | int original_tls_idx = GL(dl_tls_max_dtv_idx); | |
922 | ||
923 | struct dlmopen_args dlmargs; | |
924 | dlmargs.fname = name; | |
925 | dlmargs.map = NULL; | |
926 | ||
927 | const char *objname; | |
928 | const char *err_str = NULL; | |
929 | bool malloced; | |
930 | _dl_catch_error (&objname, &err_str, &malloced, dlmopen_doit, &dlmargs); | |
931 | if (__glibc_unlikely (err_str != NULL)) | |
932 | { | |
933 | report_audit_module_load_error (name, err_str, malloced); | |
934 | return; | |
935 | } | |
936 | ||
937 | struct lookup_args largs; | |
938 | largs.name = "la_version"; | |
939 | largs.map = dlmargs.map; | |
940 | _dl_catch_error (&objname, &err_str, &malloced, lookup_doit, &largs); | |
941 | if (__glibc_likely (err_str != NULL)) | |
942 | { | |
943 | unload_audit_module (dlmargs.map, original_tls_idx); | |
944 | report_audit_module_load_error (name, err_str, malloced); | |
945 | return; | |
946 | } | |
947 | ||
948 | unsigned int (*laversion) (unsigned int) = largs.result; | |
949 | ||
950 | /* A null symbol indicates that something is very wrong with the | |
951 | loaded object because defined symbols are supposed to have a | |
952 | valid, non-null address. */ | |
953 | assert (laversion != NULL); | |
954 | ||
955 | unsigned int lav = laversion (LAV_CURRENT); | |
956 | if (lav == 0) | |
957 | { | |
958 | /* Only print an error message if debugging because this can | |
959 | happen deliberately. */ | |
960 | if (GLRO(dl_debug_mask) & DL_DEBUG_FILES) | |
961 | _dl_debug_printf ("\ | |
962 | file=%s [%lu]; audit interface function la_version returned zero; ignored.\n", | |
963 | dlmargs.map->l_name, dlmargs.map->l_ns); | |
964 | unload_audit_module (dlmargs.map, original_tls_idx); | |
965 | return; | |
966 | } | |
967 | ||
968 | if (lav > LAV_CURRENT) | |
969 | { | |
970 | _dl_debug_printf ("\ | |
971 | ERROR: audit interface '%s' requires version %d (maximum supported version %d); ignored.\n", | |
972 | name, lav, LAV_CURRENT); | |
973 | unload_audit_module (dlmargs.map, original_tls_idx); | |
974 | return; | |
975 | } | |
976 | ||
977 | enum { naudit_ifaces = 8 }; | |
978 | union | |
979 | { | |
980 | struct audit_ifaces ifaces; | |
981 | void (*fptr[naudit_ifaces]) (void); | |
982 | } *newp = malloc (sizeof (*newp)); | |
983 | if (newp == NULL) | |
984 | _dl_fatal_printf ("Out of memory while loading audit modules\n"); | |
985 | ||
986 | /* Names of the auditing interfaces. All in one | |
987 | long string. */ | |
988 | static const char audit_iface_names[] = | |
989 | "la_activity\0" | |
990 | "la_objsearch\0" | |
991 | "la_objopen\0" | |
992 | "la_preinit\0" | |
993 | #if __ELF_NATIVE_CLASS == 32 | |
994 | "la_symbind32\0" | |
995 | #elif __ELF_NATIVE_CLASS == 64 | |
996 | "la_symbind64\0" | |
997 | #else | |
998 | # error "__ELF_NATIVE_CLASS must be defined" | |
999 | #endif | |
1000 | #define STRING(s) __STRING (s) | |
1001 | "la_" STRING (ARCH_LA_PLTENTER) "\0" | |
1002 | "la_" STRING (ARCH_LA_PLTEXIT) "\0" | |
1003 | "la_objclose\0"; | |
1004 | unsigned int cnt = 0; | |
1005 | const char *cp = audit_iface_names; | |
1006 | do | |
1007 | { | |
1008 | largs.name = cp; | |
1009 | _dl_catch_error (&objname, &err_str, &malloced, lookup_doit, &largs); | |
1010 | ||
1011 | /* Store the pointer. */ | |
1012 | if (err_str == NULL && largs.result != NULL) | |
c7bf5cea | 1013 | newp->fptr[cnt] = largs.result; |
3b856d09 FW |
1014 | else |
1015 | newp->fptr[cnt] = NULL; | |
1016 | ++cnt; | |
1017 | ||
1018 | cp = rawmemchr (cp, '\0') + 1; | |
1019 | } | |
1020 | while (*cp != '\0'); | |
1021 | assert (cnt == naudit_ifaces); | |
1022 | ||
1023 | /* Now append the new auditing interface to the list. */ | |
1024 | newp->ifaces.next = NULL; | |
1025 | if (*last_audit == NULL) | |
1026 | *last_audit = GLRO(dl_audit) = &newp->ifaces; | |
1027 | else | |
1028 | *last_audit = (*last_audit)->next = &newp->ifaces; | |
c7bf5cea | 1029 | |
e1d559f3 FW |
1030 | /* The dynamic linker link map is statically allocated, so the |
1031 | cookie in _dl_new_object has not happened. */ | |
1032 | link_map_audit_state (&GL (dl_rtld_map), GLRO (dl_naudit))->cookie | |
c7bf5cea FW |
1033 | = (intptr_t) &GL (dl_rtld_map); |
1034 | ||
3b856d09 FW |
1035 | ++GLRO(dl_naudit); |
1036 | ||
1037 | /* Mark the DSO as being used for auditing. */ | |
1038 | dlmargs.map->l_auditing = 1; | |
1039 | } | |
1040 | ||
1041 | /* Notify the the audit modules that the object MAP has already been | |
1042 | loaded. */ | |
1043 | static void | |
1044 | notify_audit_modules_of_loaded_object (struct link_map *map) | |
1045 | { | |
1046 | struct audit_ifaces *afct = GLRO(dl_audit); | |
1047 | for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt) | |
1048 | { | |
1049 | if (afct->objopen != NULL) | |
1050 | { | |
e1d559f3 FW |
1051 | struct auditstate *state = link_map_audit_state (map, cnt); |
1052 | state->bindflags = afct->objopen (map, LM_ID_BASE, &state->cookie); | |
1053 | map->l_audit_any_plt |= state->bindflags != 0; | |
3b856d09 FW |
1054 | } |
1055 | ||
1056 | afct = afct->next; | |
1057 | } | |
1058 | } | |
1059 | ||
1060 | /* Load all audit modules. */ | |
1061 | static void | |
1062 | load_audit_modules (struct link_map *main_map) | |
1063 | { | |
1064 | struct audit_ifaces *last_audit = NULL; | |
1065 | struct audit_list_iter al_iter; | |
1066 | audit_list_iter_init (&al_iter); | |
1067 | ||
1068 | while (true) | |
1069 | { | |
1070 | const char *name = audit_list_iter_next (&al_iter); | |
1071 | if (name == NULL) | |
1072 | break; | |
1073 | load_audit_module (name, &last_audit); | |
1074 | } | |
1075 | ||
1076 | /* Notify audit modules of the initially loaded modules (the main | |
1077 | program and the dynamic linker itself). */ | |
1078 | if (GLRO(dl_naudit) > 0) | |
1079 | { | |
1080 | notify_audit_modules_of_loaded_object (main_map); | |
1081 | notify_audit_modules_of_loaded_object (&GL(dl_rtld_map)); | |
1082 | } | |
1083 | } | |
1084 | ||
d66e34cd | 1085 | static void |
266180eb | 1086 | dl_main (const ElfW(Phdr) *phdr, |
72f70279 | 1087 | ElfW(Word) phnum, |
3a56ea26 AK |
1088 | ElfW(Addr) *user_entry, |
1089 | ElfW(auxv_t) *auxv) | |
d66e34cd | 1090 | { |
266180eb | 1091 | const ElfW(Phdr) *ph; |
ea278354 | 1092 | enum mode mode; |
c0f62c56 | 1093 | struct link_map *main_map; |
14bab8de UD |
1094 | size_t file_size; |
1095 | char *file; | |
164a7164 | 1096 | bool has_interp = false; |
77aba05b | 1097 | unsigned int i; |
164a7164 UD |
1098 | bool prelinked = false; |
1099 | bool rtld_is_main = false; | |
9dcafc55 | 1100 | void *tcbp = NULL; |
d66e34cd | 1101 | |
adc12574 | 1102 | GL(dl_init_static_tls) = &_dl_nothread_init_static_tls; |
adc12574 | 1103 | |
334fcf2a UD |
1104 | #if defined SHARED && defined _LIBC_REENTRANT \ |
1105 | && defined __rtld_lock_default_lock_recursive | |
1106 | GL(dl_rtld_lock_recursive) = rtld_lock_default_lock_recursive; | |
1107 | GL(dl_rtld_unlock_recursive) = rtld_lock_default_unlock_recursive; | |
1108 | #endif | |
1109 | ||
c70ba488 RM |
1110 | /* The explicit initialization here is cheaper than processing the reloc |
1111 | in the _rtld_local definition's initializer. */ | |
1112 | GL(dl_make_stack_executable_hook) = &_dl_make_stack_executable; | |
1113 | ||
ea278354 | 1114 | /* Process the environment variable which control the behaviour. */ |
ba9fcb3f | 1115 | process_envvars (&mode); |
3996f34b | 1116 | |
ce6e047f | 1117 | #ifndef HAVE_INLINED_SYSCALLS |
46ec036d | 1118 | /* Set up a flag which tells we are just starting. */ |
9cf27b8d | 1119 | _dl_starting_up = 1; |
ce6e047f | 1120 | #endif |
46ec036d | 1121 | |
a16956f3 | 1122 | if (*user_entry == (ElfW(Addr)) ENTRY_POINT) |
0200214b RM |
1123 | { |
1124 | /* Ho ho. We are not the program interpreter! We are the program | |
1125 | itself! This means someone ran ld.so as a command. Well, that | |
1126 | might be convenient to do sometimes. We support it by | |
1127 | interpreting the args like this: | |
1128 | ||
1129 | ld.so PROGRAM ARGS... | |
1130 | ||
1131 | The first argument is the name of a file containing an ELF | |
1132 | executable we will load and run with the following arguments. | |
1133 | To simplify life here, PROGRAM is searched for using the | |
1134 | normal rules for shared objects, rather than $PATH or anything | |
1135 | like that. We just load it and use its entry point; we don't | |
1136 | pay attention to its PT_INTERP command (we are the interpreter | |
1137 | ourselves). This is an easy way to test a new ld.so before | |
1138 | installing it. */ | |
164a7164 | 1139 | rtld_is_main = true; |
421f82e5 | 1140 | |
ffee1316 | 1141 | /* Note the place where the dynamic linker actually came from. */ |
e6caf4e1 | 1142 | GL(dl_rtld_map).l_name = rtld_progname; |
6a76c115 | 1143 | |
fd26970f | 1144 | while (_dl_argc > 1) |
4243cbea | 1145 | if (! strcmp (_dl_argv[1], "--list")) |
fd26970f UD |
1146 | { |
1147 | mode = list; | |
afdca0f2 | 1148 | GLRO(dl_lazy) = -1; /* This means do no dependency analysis. */ |
61965e9b | 1149 | |
fd26970f UD |
1150 | ++_dl_skip_args; |
1151 | --_dl_argc; | |
4243cbea | 1152 | ++_dl_argv; |
fd26970f | 1153 | } |
4243cbea | 1154 | else if (! strcmp (_dl_argv[1], "--verify")) |
fd26970f UD |
1155 | { |
1156 | mode = verify; | |
6a76c115 | 1157 | |
73d65cc3 SP |
1158 | ++_dl_skip_args; |
1159 | --_dl_argc; | |
4243cbea | 1160 | ++_dl_argv; |
73d65cc3 | 1161 | } |
4243cbea | 1162 | else if (! strcmp (_dl_argv[1], "--inhibit-cache")) |
73d65cc3 SP |
1163 | { |
1164 | GLRO(dl_inhibit_cache) = 1; | |
fd26970f UD |
1165 | ++_dl_skip_args; |
1166 | --_dl_argc; | |
4243cbea | 1167 | ++_dl_argv; |
fd26970f | 1168 | } |
4243cbea | 1169 | else if (! strcmp (_dl_argv[1], "--library-path") |
e6caf4e1 | 1170 | && _dl_argc > 2) |
880f421f | 1171 | { |
4243cbea | 1172 | library_path = _dl_argv[2]; |
880f421f | 1173 | |
310930c1 UD |
1174 | _dl_skip_args += 2; |
1175 | _dl_argc -= 2; | |
4243cbea | 1176 | _dl_argv += 2; |
310930c1 | 1177 | } |
4243cbea | 1178 | else if (! strcmp (_dl_argv[1], "--inhibit-rpath") |
e6caf4e1 | 1179 | && _dl_argc > 2) |
310930c1 | 1180 | { |
4243cbea | 1181 | GLRO(dl_inhibit_rpath) = _dl_argv[2]; |
310930c1 | 1182 | |
74780cf6 UD |
1183 | _dl_skip_args += 2; |
1184 | _dl_argc -= 2; | |
4243cbea | 1185 | _dl_argv += 2; |
74780cf6 | 1186 | } |
4243cbea | 1187 | else if (! strcmp (_dl_argv[1], "--audit") && _dl_argc > 2) |
74780cf6 | 1188 | { |
4243cbea | 1189 | process_dl_audit (_dl_argv[2]); |
74780cf6 | 1190 | |
8692ebdb DN |
1191 | _dl_skip_args += 2; |
1192 | _dl_argc -= 2; | |
1193 | _dl_argv += 2; | |
1194 | } | |
1195 | else if (! strcmp (_dl_argv[1], "--preload") && _dl_argc > 2) | |
1196 | { | |
1197 | preloadarg = _dl_argv[2]; | |
880f421f UD |
1198 | _dl_skip_args += 2; |
1199 | _dl_argc -= 2; | |
4243cbea | 1200 | _dl_argv += 2; |
880f421f | 1201 | } |
fd26970f UD |
1202 | else |
1203 | break; | |
d66e34cd | 1204 | |
61eb22d3 UD |
1205 | /* If we have no further argument the program was called incorrectly. |
1206 | Grant the user some education. */ | |
1207 | if (_dl_argc < 2) | |
35fc382a | 1208 | _dl_fatal_printf ("\ |
2bcf29ba | 1209 | Usage: ld.so [OPTION]... EXECUTABLE-FILE [ARGS-FOR-PROGRAM...]\n\ |
61eb22d3 UD |
1210 | You have invoked `ld.so', the helper program for shared library executables.\n\ |
1211 | This program usually lives in the file `/lib/ld.so', and special directives\n\ | |
1212 | in executable files using ELF shared libraries tell the system's program\n\ | |
1213 | loader to load the helper program from this file. This helper program loads\n\ | |
1214 | the shared libraries needed by the program executable, prepares the program\n\ | |
1215 | to run, and runs it. You may invoke this helper program directly from the\n\ | |
1216 | command line to load and run an ELF executable file; this is like executing\n\ | |
1217 | that file itself, but always uses this helper program from the file you\n\ | |
1218 | specified, instead of the helper program file specified in the executable\n\ | |
1219 | file you run. This is mostly of use for maintainers to test new versions\n\ | |
2bcf29ba UD |
1220 | of this helper program; chances are you did not intend to run this program.\n\ |
1221 | \n\ | |
b0a01055 UD |
1222 | --list list all dependencies and how they are resolved\n\ |
1223 | --verify verify that given object really is a dynamically linked\n\ | |
3a56ea26 | 1224 | object we can handle\n\ |
73d65cc3 | 1225 | --inhibit-cache Do not use " LD_SO_CACHE "\n\ |
b0a01055 | 1226 | --library-path PATH use given PATH instead of content of the environment\n\ |
3a56ea26 | 1227 | variable LD_LIBRARY_PATH\n\ |
fcf70d41 | 1228 | --inhibit-rpath LIST ignore RUNPATH and RPATH information in object names\n\ |
3a56ea26 | 1229 | in LIST\n\ |
8692ebdb DN |
1230 | --audit LIST use objects named in LIST as auditors\n\ |
1231 | --preload LIST preload objects named in LIST\n"); | |
61eb22d3 | 1232 | |
0200214b RM |
1233 | ++_dl_skip_args; |
1234 | --_dl_argc; | |
4243cbea | 1235 | ++_dl_argv; |
91f62ce6 | 1236 | |
c70ba488 RM |
1237 | /* The initialization of _dl_stack_flags done below assumes the |
1238 | executable's PT_GNU_STACK may have been honored by the kernel, and | |
1239 | so a PT_GNU_STACK with PF_X set means the stack started out with | |
1240 | execute permission. However, this is not really true if the | |
1241 | dynamic linker is the executable the kernel loaded. For this | |
1242 | case, we must reinitialize _dl_stack_flags to match the dynamic | |
1243 | linker itself. If the dynamic linker was built with a | |
1244 | PT_GNU_STACK, then the kernel may have loaded us with a | |
1245 | nonexecutable stack that we will have to make executable when we | |
1246 | load the program below unless it has a PT_GNU_STACK indicating | |
1247 | nonexecutable stack is ok. */ | |
1248 | ||
1249 | for (ph = phdr; ph < &phdr[phnum]; ++ph) | |
1250 | if (ph->p_type == PT_GNU_STACK) | |
1251 | { | |
1252 | GL(dl_stack_flags) = ph->p_flags; | |
1253 | break; | |
1254 | } | |
1255 | ||
9a821cf9 | 1256 | if (__builtin_expect (mode, normal) == verify) |
2de99474 | 1257 | { |
8e17ea58 UD |
1258 | const char *objname; |
1259 | const char *err_str = NULL; | |
993b3242 | 1260 | struct map_args args; |
74780cf6 | 1261 | bool malloced; |
2de99474 | 1262 | |
e6caf4e1 | 1263 | args.str = rtld_progname; |
f04b9a68 | 1264 | args.loader = NULL; |
f04b9a68 | 1265 | args.mode = __RTLD_OPENEXEC; |
74780cf6 UD |
1266 | (void) _dl_catch_error (&objname, &err_str, &malloced, map_doit, |
1267 | &args); | |
a1ffb40e | 1268 | if (__glibc_unlikely (err_str != NULL)) |
e6caf4e1 UD |
1269 | /* We don't free the returned string, the programs stops |
1270 | anyway. */ | |
1271 | _exit (EXIT_FAILURE); | |
2de99474 UD |
1272 | } |
1273 | else | |
db276fa1 | 1274 | { |
1e372ded AZ |
1275 | RTLD_TIMING_VAR (start); |
1276 | rtld_timer_start (&start); | |
798212a0 | 1277 | _dl_map_object (NULL, rtld_progname, lt_executable, 0, |
c0f62c56 | 1278 | __RTLD_OPENEXEC, LM_ID_BASE); |
1e372ded | 1279 | rtld_timer_stop (&load_time, start); |
db276fa1 | 1280 | } |
2de99474 | 1281 | |
c0f62c56 UD |
1282 | /* Now the map for the main executable is available. */ |
1283 | main_map = GL(dl_ns)[LM_ID_BASE]._ns_loaded; | |
1284 | ||
f3fd569c DL |
1285 | if (__builtin_expect (mode, normal) == normal |
1286 | && GL(dl_rtld_map).l_info[DT_SONAME] != NULL | |
01f16ab0 UD |
1287 | && main_map->l_info[DT_SONAME] != NULL |
1288 | && strcmp ((const char *) D_PTR (&GL(dl_rtld_map), l_info[DT_STRTAB]) | |
1289 | + GL(dl_rtld_map).l_info[DT_SONAME]->d_un.d_val, | |
1290 | (const char *) D_PTR (main_map, l_info[DT_STRTAB]) | |
1291 | + main_map->l_info[DT_SONAME]->d_un.d_val) == 0) | |
1292 | _dl_fatal_printf ("loader cannot load itself\n"); | |
1293 | ||
c0f62c56 UD |
1294 | phdr = main_map->l_phdr; |
1295 | phnum = main_map->l_phnum; | |
143e2b96 UD |
1296 | /* We overwrite here a pointer to a malloc()ed string. But since |
1297 | the malloc() implementation used at this point is the dummy | |
1298 | implementations which has no real free() function it does not | |
1299 | makes sense to free the old string first. */ | |
c0f62c56 UD |
1300 | main_map->l_name = (char *) ""; |
1301 | *user_entry = main_map->l_entry; | |
3a56ea26 | 1302 | |
bc58236c | 1303 | #ifdef HAVE_AUX_VECTOR |
3a56ea26 AK |
1304 | /* Adjust the on-stack auxiliary vector so that it looks like the |
1305 | binary was executed directly. */ | |
bc58236c | 1306 | for (ElfW(auxv_t) *av = auxv; av->a_type != AT_NULL; av++) |
3a56ea26 AK |
1307 | switch (av->a_type) |
1308 | { | |
1309 | case AT_PHDR: | |
4dd019e3 | 1310 | av->a_un.a_val = (uintptr_t) phdr; |
3a56ea26 AK |
1311 | break; |
1312 | case AT_PHNUM: | |
1313 | av->a_un.a_val = phnum; | |
1314 | break; | |
1315 | case AT_ENTRY: | |
1316 | av->a_un.a_val = *user_entry; | |
1317 | break; | |
5c349950 PP |
1318 | case AT_EXECFN: |
1319 | av->a_un.a_val = (uintptr_t) _dl_argv[0]; | |
1320 | break; | |
3a56ea26 | 1321 | } |
bc58236c | 1322 | #endif |
0200214b RM |
1323 | } |
1324 | else | |
1325 | { | |
1326 | /* Create a link_map for the executable itself. | |
1327 | This will be what dlopen on "" returns. */ | |
9fbdeb41 UD |
1328 | main_map = _dl_new_object ((char *) "", "", lt_executable, NULL, |
1329 | __RTLD_OPENEXEC, LM_ID_BASE); | |
9dcafc55 | 1330 | assert (main_map != NULL); |
c0f62c56 UD |
1331 | main_map->l_phdr = phdr; |
1332 | main_map->l_phnum = phnum; | |
1333 | main_map->l_entry = *user_entry; | |
da832465 | 1334 | |
f0967738 AK |
1335 | /* Even though the link map is not yet fully initialized we can add |
1336 | it to the map list since there are no possible users running yet. */ | |
1337 | _dl_add_to_namespace_list (main_map, LM_ID_BASE); | |
fa41c84d | 1338 | assert (main_map == GL(dl_ns)[LM_ID_BASE]._ns_loaded); |
f0967738 | 1339 | |
61e0617a UD |
1340 | /* At this point we are in a bit of trouble. We would have to |
1341 | fill in the values for l_dev and l_ino. But in general we | |
1342 | do not know where the file is. We also do not handle AT_EXECFD | |
1343 | even if it would be passed up. | |
1344 | ||
1345 | We leave the values here defined to 0. This is normally no | |
1346 | problem as the program code itself is normally no shared | |
1347 | object and therefore cannot be loaded dynamically. Nothing | |
1348 | prevent the use of dynamic binaries and in these situations | |
1349 | we might get problems. We might not be able to find out | |
1350 | whether the object is already loaded. But since there is no | |
1351 | easy way out and because the dynamic binary must also not | |
1352 | have an SONAME we ignore this program for now. If it becomes | |
1353 | a problem we can force people using SONAMEs. */ | |
1354 | ||
97a51d8a UD |
1355 | /* We delay initializing the path structure until we got the dynamic |
1356 | information for the program. */ | |
0200214b RM |
1357 | } |
1358 | ||
c0f62c56 UD |
1359 | main_map->l_map_end = 0; |
1360 | main_map->l_text_end = 0; | |
052b6a6c | 1361 | /* Perhaps the executable has no PT_LOAD header entries at all. */ |
c0f62c56 | 1362 | main_map->l_map_start = ~0; |
c0f62c56 UD |
1363 | /* And it was opened directly. */ |
1364 | ++main_map->l_direct_opencount; | |
052b6a6c | 1365 | |
0200214b | 1366 | /* Scan the program header table for the dynamic section. */ |
72f70279 | 1367 | for (ph = phdr; ph < &phdr[phnum]; ++ph) |
0200214b RM |
1368 | switch (ph->p_type) |
1369 | { | |
da832465 UD |
1370 | case PT_PHDR: |
1371 | /* Find out the load address. */ | |
c0f62c56 | 1372 | main_map->l_addr = (ElfW(Addr)) phdr - ph->p_vaddr; |
da832465 | 1373 | break; |
0200214b RM |
1374 | case PT_DYNAMIC: |
1375 | /* This tells us where to find the dynamic section, | |
1376 | which tells us everything we need to do. */ | |
c0f62c56 | 1377 | main_map->l_ld = (void *) main_map->l_addr + ph->p_vaddr; |
0200214b RM |
1378 | break; |
1379 | case PT_INTERP: | |
1380 | /* This "interpreter segment" was used by the program loader to | |
1381 | find the program interpreter, which is this program itself, the | |
1382 | dynamic linker. We note what name finds us, so that a future | |
1383 | dlopen call or DT_NEEDED entry, for something that wants to link | |
1384 | against the dynamic linker as a shared library, will know that | |
1385 | the shared object is already loaded. */ | |
c0f62c56 | 1386 | _dl_rtld_libname.name = ((const char *) main_map->l_addr |
be935610 | 1387 | + ph->p_vaddr); |
752a2a50 | 1388 | /* _dl_rtld_libname.next = NULL; Already zero. */ |
d6b5d570 | 1389 | GL(dl_rtld_map).l_libname = &_dl_rtld_libname; |
f41c8091 UD |
1390 | |
1391 | /* Ordinarilly, we would get additional names for the loader from | |
1392 | our DT_SONAME. This can't happen if we were actually linked as | |
1393 | a static executable (detect this case when we have no DYNAMIC). | |
1394 | If so, assume the filename component of the interpreter path to | |
1395 | be our SONAME, and add it to our name list. */ | |
d6b5d570 | 1396 | if (GL(dl_rtld_map).l_ld == NULL) |
f41c8091 | 1397 | { |
88794e30 UD |
1398 | const char *p = NULL; |
1399 | const char *cp = _dl_rtld_libname.name; | |
1400 | ||
1401 | /* Find the filename part of the path. */ | |
1402 | while (*cp != '\0') | |
1403 | if (*cp++ == '/') | |
1404 | p = cp; | |
1405 | ||
1406 | if (p != NULL) | |
f41c8091 | 1407 | { |
88794e30 | 1408 | _dl_rtld_libname2.name = p; |
752a2a50 | 1409 | /* _dl_rtld_libname2.next = NULL; Already zero. */ |
f41c8091 UD |
1410 | _dl_rtld_libname.next = &_dl_rtld_libname2; |
1411 | } | |
1412 | } | |
1413 | ||
164a7164 | 1414 | has_interp = true; |
0200214b | 1415 | break; |
052b6a6c | 1416 | case PT_LOAD: |
052b6a6c UD |
1417 | { |
1418 | ElfW(Addr) mapstart; | |
2373b30e UD |
1419 | ElfW(Addr) allocend; |
1420 | ||
1421 | /* Remember where the main program starts in memory. */ | |
b92e3780 UD |
1422 | mapstart = (main_map->l_addr |
1423 | + (ph->p_vaddr & ~(GLRO(dl_pagesize) - 1))); | |
c0f62c56 UD |
1424 | if (main_map->l_map_start > mapstart) |
1425 | main_map->l_map_start = mapstart; | |
2373b30e UD |
1426 | |
1427 | /* Also where it ends. */ | |
c0f62c56 UD |
1428 | allocend = main_map->l_addr + ph->p_vaddr + ph->p_memsz; |
1429 | if (main_map->l_map_end < allocend) | |
1430 | main_map->l_map_end = allocend; | |
1431 | if ((ph->p_flags & PF_X) && allocend > main_map->l_text_end) | |
1432 | main_map->l_text_end = allocend; | |
052b6a6c UD |
1433 | } |
1434 | break; | |
9dcafc55 | 1435 | |
a334319f | 1436 | case PT_TLS: |
aed283dd UD |
1437 | if (ph->p_memsz > 0) |
1438 | { | |
1439 | /* Note that in the case the dynamic linker we duplicate work | |
1440 | here since we read the PT_TLS entry already in | |
1441 | _dl_start_final. But the result is repeatable so do not | |
1442 | check for this special but unimportant case. */ | |
c0f62c56 UD |
1443 | main_map->l_tls_blocksize = ph->p_memsz; |
1444 | main_map->l_tls_align = ph->p_align; | |
99fe3b0e | 1445 | if (ph->p_align == 0) |
c0f62c56 | 1446 | main_map->l_tls_firstbyte_offset = 0; |
99fe3b0e | 1447 | else |
c0f62c56 UD |
1448 | main_map->l_tls_firstbyte_offset = (ph->p_vaddr |
1449 | & (ph->p_align - 1)); | |
1450 | main_map->l_tls_initimage_size = ph->p_filesz; | |
1451 | main_map->l_tls_initimage = (void *) ph->p_vaddr; | |
aed283dd UD |
1452 | |
1453 | /* This image gets the ID one. */ | |
c0f62c56 | 1454 | GL(dl_tls_max_dtv_idx) = main_map->l_tls_modid = 1; |
aed283dd | 1455 | } |
9dcafc55 UD |
1456 | break; |
1457 | ||
ecdeaac0 RM |
1458 | case PT_GNU_STACK: |
1459 | GL(dl_stack_flags) = ph->p_flags; | |
1460 | break; | |
e8ed861d UD |
1461 | |
1462 | case PT_GNU_RELRO: | |
c0f62c56 UD |
1463 | main_map->l_relro_addr = ph->p_vaddr; |
1464 | main_map->l_relro_size = ph->p_memsz; | |
e8ed861d | 1465 | break; |
f753fa7d L |
1466 | |
1467 | case PT_NOTE: | |
1468 | if (_rtld_process_pt_note (main_map, ph)) | |
1469 | _dl_error_printf ("\ | |
1470 | ERROR: '%s': cannot process note segment.\n", _dl_argv[0]); | |
1471 | break; | |
0200214b | 1472 | } |
11bf311e UD |
1473 | |
1474 | /* Adjust the address of the TLS initialization image in case | |
1475 | the executable is actually an ET_DYN object. */ | |
1476 | if (main_map->l_tls_initimage != NULL) | |
1477 | main_map->l_tls_initimage | |
1478 | = (char *) main_map->l_tls_initimage + main_map->l_addr; | |
c0f62c56 UD |
1479 | if (! main_map->l_map_end) |
1480 | main_map->l_map_end = ~0; | |
1481 | if (! main_map->l_text_end) | |
1482 | main_map->l_text_end = ~0; | |
d6b5d570 | 1483 | if (! GL(dl_rtld_map).l_libname && GL(dl_rtld_map).l_name) |
c84142e8 UD |
1484 | { |
1485 | /* We were invoked directly, so the program might not have a | |
1486 | PT_INTERP. */ | |
d6b5d570 | 1487 | _dl_rtld_libname.name = GL(dl_rtld_map).l_name; |
f0967738 | 1488 | /* _dl_rtld_libname.next = NULL; Already zero. */ |
d6b5d570 | 1489 | GL(dl_rtld_map).l_libname = &_dl_rtld_libname; |
c84142e8 | 1490 | } |
ffee1316 | 1491 | else |
d6b5d570 | 1492 | assert (GL(dl_rtld_map).l_libname); /* How else did we get here? */ |
0200214b | 1493 | |
9dcafc55 UD |
1494 | /* If the current libname is different from the SONAME, add the |
1495 | latter as well. */ | |
1496 | if (GL(dl_rtld_map).l_info[DT_SONAME] != NULL | |
1497 | && strcmp (GL(dl_rtld_map).l_libname->name, | |
1498 | (const char *) D_PTR (&GL(dl_rtld_map), l_info[DT_STRTAB]) | |
1499 | + GL(dl_rtld_map).l_info[DT_SONAME]->d_un.d_val) != 0) | |
1500 | { | |
1501 | static struct libname_list newname; | |
1502 | newname.name = ((char *) D_PTR (&GL(dl_rtld_map), l_info[DT_STRTAB]) | |
1503 | + GL(dl_rtld_map).l_info[DT_SONAME]->d_un.d_ptr); | |
1504 | newname.next = NULL; | |
1505 | newname.dont_free = 1; | |
1506 | ||
1507 | assert (GL(dl_rtld_map).l_libname->next == NULL); | |
1508 | GL(dl_rtld_map).l_libname->next = &newname; | |
1509 | } | |
1510 | /* The ld.so must be relocated since otherwise loading audit modules | |
1511 | will fail since they reuse the very same ld.so. */ | |
1512 | assert (GL(dl_rtld_map).l_relocated); | |
1513 | ||
9a51759b UD |
1514 | if (! rtld_is_main) |
1515 | { | |
1516 | /* Extract the contents of the dynamic section for easy access. */ | |
c0f62c56 | 1517 | elf_get_dynamic_info (main_map, NULL); |
efec5079 | 1518 | /* Set up our cache of pointers into the hash table. */ |
c0f62c56 | 1519 | _dl_setup_hash (main_map); |
9a51759b | 1520 | } |
0200214b | 1521 | |
9a821cf9 | 1522 | if (__builtin_expect (mode, normal) == verify) |
e2102c14 UD |
1523 | { |
1524 | /* We were called just to verify that this is a dynamic | |
1525 | executable using us as the program interpreter. Exit with an | |
1526 | error if we were not able to load the binary or no interpreter | |
1527 | is specified (i.e., this is no dynamically linked binary. */ | |
c0f62c56 | 1528 | if (main_map->l_ld == NULL) |
e2102c14 | 1529 | _exit (1); |
e2102c14 UD |
1530 | |
1531 | /* We allow here some platform specific code. */ | |
1532 | #ifdef DISTINGUISH_LIB_VERSIONS | |
1533 | DISTINGUISH_LIB_VERSIONS; | |
1534 | #endif | |
eb406346 | 1535 | _exit (has_interp ? 0 : 2); |
e2102c14 UD |
1536 | } |
1537 | ||
ab1d521d | 1538 | struct link_map **first_preload = &GL(dl_rtld_map).l_next; |
ab1d521d RM |
1539 | /* Set up the data structures for the system-supplied DSO early, |
1540 | so they can influence _dl_init_paths. */ | |
9cee5585 | 1541 | setup_vdso (main_map, &first_preload); |
ab1d521d | 1542 | |
1bdda52f AZ |
1543 | /* With vDSO setup we can initialize the function pointers. */ |
1544 | setup_vdso_pointers (); | |
1545 | ||
ab1d521d | 1546 | #ifdef DL_SYSDEP_OSCHECK |
ceb809dc | 1547 | DL_SYSDEP_OSCHECK (_dl_fatal_printf); |
ab1d521d RM |
1548 | #endif |
1549 | ||
1550 | /* Initialize the data structures for the search paths for shared | |
1551 | objects. */ | |
1552 | _dl_init_paths (library_path); | |
97a51d8a | 1553 | |
9dcafc55 | 1554 | /* Initialize _r_debug. */ |
29f97654 UD |
1555 | struct r_debug *r = _dl_debug_initialize (GL(dl_rtld_map).l_addr, |
1556 | LM_ID_BASE); | |
9dcafc55 UD |
1557 | r->r_state = RT_CONSISTENT; |
1558 | ||
0200214b | 1559 | /* Put the link_map for ourselves on the chain so it can be found by |
ceb2d9aa | 1560 | name. Note that at this point the global chain of link maps contains |
d6b5d570 UD |
1561 | exactly one element, which is pointed to by dl_loaded. */ |
1562 | if (! GL(dl_rtld_map).l_name) | |
ffee1316 RM |
1563 | /* If not invoked directly, the dynamic linker shared object file was |
1564 | found by the PT_INTERP name. */ | |
d6b5d570 UD |
1565 | GL(dl_rtld_map).l_name = (char *) GL(dl_rtld_map).l_libname->name; |
1566 | GL(dl_rtld_map).l_type = lt_library; | |
c0f62c56 UD |
1567 | main_map->l_next = &GL(dl_rtld_map); |
1568 | GL(dl_rtld_map).l_prev = main_map; | |
1569 | ++GL(dl_ns)[LM_ID_BASE]._ns_nloaded; | |
e8ed861d | 1570 | ++GL(dl_load_adds); |
0200214b | 1571 | |
97fd3a30 UD |
1572 | /* If LD_USE_LOAD_BIAS env variable has not been seen, default |
1573 | to not using bias for non-prelinked PIEs and libraries | |
1574 | and using it for executables or prelinked PIEs or libraries. */ | |
afdca0f2 | 1575 | if (GLRO(dl_use_load_bias) == (ElfW(Addr)) -2) |
c0f62c56 | 1576 | GLRO(dl_use_load_bias) = main_map->l_addr == 0 ? -1 : 0; |
97fd3a30 | 1577 | |
553eca26 | 1578 | /* Set up the program header information for the dynamic linker |
44c4e5d5 RM |
1579 | itself. It is needed in the dl_iterate_phdr callbacks. */ |
1580 | const ElfW(Ehdr) *rtld_ehdr; | |
1581 | ||
1582 | /* Starting from binutils-2.23, the linker will define the magic symbol | |
1583 | __ehdr_start to point to our own ELF header if it is visible in a | |
1584 | segment that also includes the phdrs. If that's not available, we use | |
1585 | the old method that assumes the beginning of the file is part of the | |
1586 | lowest-addressed PT_LOAD segment. */ | |
1587 | #ifdef HAVE_EHDR_START | |
1588 | extern const ElfW(Ehdr) __ehdr_start __attribute__ ((visibility ("hidden"))); | |
1589 | rtld_ehdr = &__ehdr_start; | |
1590 | #else | |
1591 | rtld_ehdr = (void *) GL(dl_rtld_map).l_map_start; | |
1592 | #endif | |
1593 | assert (rtld_ehdr->e_ehsize == sizeof *rtld_ehdr); | |
1594 | assert (rtld_ehdr->e_phentsize == sizeof (ElfW(Phdr))); | |
1595 | ||
1596 | const ElfW(Phdr) *rtld_phdr = (const void *) rtld_ehdr + rtld_ehdr->e_phoff; | |
1597 | ||
e8ed861d | 1598 | GL(dl_rtld_map).l_phdr = rtld_phdr; |
553eca26 UD |
1599 | GL(dl_rtld_map).l_phnum = rtld_ehdr->e_phnum; |
1600 | ||
9dcafc55 | 1601 | |
e8ed861d UD |
1602 | /* PT_GNU_RELRO is usually the last phdr. */ |
1603 | size_t cnt = rtld_ehdr->e_phnum; | |
1604 | while (cnt-- > 0) | |
1605 | if (rtld_phdr[cnt].p_type == PT_GNU_RELRO) | |
1606 | { | |
1607 | GL(dl_rtld_map).l_relro_addr = rtld_phdr[cnt].p_vaddr; | |
1608 | GL(dl_rtld_map).l_relro_size = rtld_phdr[cnt].p_memsz; | |
1609 | break; | |
1610 | } | |
1611 | ||
9dcafc55 UD |
1612 | /* Add the dynamic linker to the TLS list if it also uses TLS. */ |
1613 | if (GL(dl_rtld_map).l_tls_blocksize != 0) | |
1614 | /* Assign a module ID. Do this before loading any audit modules. */ | |
1615 | GL(dl_rtld_map).l_tls_modid = _dl_next_tls_modid (); | |
9dcafc55 UD |
1616 | |
1617 | /* If we have auditing DSOs to load, do it now. */ | |
81b82fb9 FW |
1618 | bool need_security_init = true; |
1619 | if (__glibc_unlikely (audit_list != NULL) | |
1620 | || __glibc_unlikely (audit_list_string != NULL)) | |
9dcafc55 | 1621 | { |
3abee0b7 UD |
1622 | /* Since we start using the auditing DSOs right away we need to |
1623 | initialize the data structures now. */ | |
1624 | tcbp = init_tls (); | |
1625 | ||
4c48ef06 UD |
1626 | /* Initialize security features. We need to do it this early |
1627 | since otherwise the constructors of the audit libraries will | |
1628 | use different values (especially the pointer guard) and will | |
1629 | fail later on. */ | |
1630 | security_init (); | |
81b82fb9 | 1631 | need_security_init = false; |
4c48ef06 | 1632 | |
3b856d09 | 1633 | load_audit_modules (main_map); |
9dcafc55 UD |
1634 | } |
1635 | ||
d0503676 CD |
1636 | /* Keep track of the currently loaded modules to count how many |
1637 | non-audit modules which use TLS are loaded. */ | |
1638 | size_t count_modids = _dl_count_modids (); | |
1639 | ||
c63d8f80 UD |
1640 | /* Set up debugging before the debugger is notified for the first time. */ |
1641 | #ifdef ELF_MACHINE_DEBUG_SETUP | |
1642 | /* Some machines (e.g. MIPS) don't use DT_DEBUG in this way. */ | |
1643 | ELF_MACHINE_DEBUG_SETUP (main_map, r); | |
1644 | ELF_MACHINE_DEBUG_SETUP (&GL(dl_rtld_map), r); | |
1645 | #else | |
1646 | if (main_map->l_info[DT_DEBUG] != NULL) | |
1647 | /* There is a DT_DEBUG entry in the dynamic section. Fill it in | |
1648 | with the run-time address of the r_debug structure */ | |
1649 | main_map->l_info[DT_DEBUG]->d_un.d_ptr = (ElfW(Addr)) r; | |
1650 | ||
1651 | /* Fill in the pointer in the dynamic linker's own dynamic section, in | |
1652 | case you run gdb on the dynamic linker directly. */ | |
1653 | if (GL(dl_rtld_map).l_info[DT_DEBUG] != NULL) | |
1654 | GL(dl_rtld_map).l_info[DT_DEBUG]->d_un.d_ptr = (ElfW(Addr)) r; | |
1655 | #endif | |
1656 | ||
9dcafc55 UD |
1657 | /* We start adding objects. */ |
1658 | r->r_state = RT_ADD; | |
1659 | _dl_debug_state (); | |
815e6fa3 | 1660 | LIBC_PROBE (init_start, 2, LM_ID_BASE, r); |
9dcafc55 UD |
1661 | |
1662 | /* Auditing checkpoint: we are ready to signal that the initial map | |
1663 | is being constructed. */ | |
a1ffb40e | 1664 | if (__glibc_unlikely (GLRO(dl_naudit) > 0)) |
9dcafc55 UD |
1665 | { |
1666 | struct audit_ifaces *afct = GLRO(dl_audit); | |
1667 | for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt) | |
1668 | { | |
1669 | if (afct->activity != NULL) | |
e1d559f3 FW |
1670 | afct->activity (&link_map_audit_state (main_map, cnt)->cookie, |
1671 | LA_ACT_ADD); | |
9dcafc55 UD |
1672 | |
1673 | afct = afct->next; | |
1674 | } | |
1675 | } | |
1676 | ||
14bab8de | 1677 | /* We have two ways to specify objects to preload: via environment |
49c091e5 | 1678 | variable and via the file /etc/ld.so.preload. The latter can also |
14bab8de | 1679 | be used when security is enabled. */ |
ab1d521d | 1680 | assert (*first_preload == NULL); |
20fe49b9 UD |
1681 | struct link_map **preloads = NULL; |
1682 | unsigned int npreloads = 0; | |
14bab8de | 1683 | |
a1ffb40e | 1684 | if (__glibc_unlikely (preloadlist != NULL)) |
c4029823 | 1685 | { |
1e372ded AZ |
1686 | RTLD_TIMING_VAR (start); |
1687 | rtld_timer_start (&start); | |
8692ebdb | 1688 | npreloads += handle_preload_list (preloadlist, main_map, "LD_PRELOAD"); |
1e372ded | 1689 | rtld_timer_accum (&load_time, start); |
8692ebdb DN |
1690 | } |
1691 | ||
1692 | if (__glibc_unlikely (preloadarg != NULL)) | |
1693 | { | |
1e372ded AZ |
1694 | RTLD_TIMING_VAR (start); |
1695 | rtld_timer_start (&start); | |
8692ebdb | 1696 | npreloads += handle_preload_list (preloadarg, main_map, "--preload"); |
1e372ded | 1697 | rtld_timer_accum (&load_time, start); |
c4029823 UD |
1698 | } |
1699 | ||
761490a1 UD |
1700 | /* There usually is no ld.so.preload file, it should only be used |
1701 | for emergencies and testing. So the open call etc should usually | |
1702 | fail. Using access() on a non-existing file is faster than using | |
1703 | open(). So we do this first. If it succeeds we do almost twice | |
1704 | the work but this does not matter, since it is not for production | |
1705 | use. */ | |
1706 | static const char preload_file[] = "/etc/ld.so.preload"; | |
a1ffb40e | 1707 | if (__glibc_unlikely (__access (preload_file, R_OK) == 0)) |
14bab8de | 1708 | { |
761490a1 UD |
1709 | /* Read the contents of the file. */ |
1710 | file = _dl_sysdep_read_whole_file (preload_file, &file_size, | |
1711 | PROT_READ | PROT_WRITE); | |
a1ffb40e | 1712 | if (__glibc_unlikely (file != MAP_FAILED)) |
14bab8de | 1713 | { |
761490a1 UD |
1714 | /* Parse the file. It contains names of libraries to be loaded, |
1715 | separated by white spaces or `:'. It may also contain | |
1716 | comments introduced by `#'. */ | |
1717 | char *problem; | |
1718 | char *runp; | |
1719 | size_t rest; | |
1720 | ||
1721 | /* Eliminate comments. */ | |
e2102c14 | 1722 | runp = file; |
761490a1 UD |
1723 | rest = file_size; |
1724 | while (rest > 0) | |
1725 | { | |
1726 | char *comment = memchr (runp, '#', rest); | |
1727 | if (comment == NULL) | |
1728 | break; | |
1729 | ||
1730 | rest -= comment - runp; | |
1731 | do | |
1732 | *comment = ' '; | |
1733 | while (--rest > 0 && *++comment != '\n'); | |
1734 | } | |
1735 | ||
1736 | /* We have one problematic case: if we have a name at the end of | |
1737 | the file without a trailing terminating characters, we cannot | |
1738 | place the \0. Handle the case separately. */ | |
1739 | if (file[file_size - 1] != ' ' && file[file_size - 1] != '\t' | |
1740 | && file[file_size - 1] != '\n' && file[file_size - 1] != ':') | |
1741 | { | |
1742 | problem = &file[file_size]; | |
1743 | while (problem > file && problem[-1] != ' ' | |
1744 | && problem[-1] != '\t' | |
1745 | && problem[-1] != '\n' && problem[-1] != ':') | |
1746 | --problem; | |
1747 | ||
1748 | if (problem > file) | |
1749 | problem[-1] = '\0'; | |
1750 | } | |
1751 | else | |
1752 | { | |
1753 | problem = NULL; | |
1754 | file[file_size - 1] = '\0'; | |
1755 | } | |
f04b9a68 | 1756 | |
1e372ded AZ |
1757 | RTLD_TIMING_VAR (start); |
1758 | rtld_timer_start (&start); | |
f04b9a68 | 1759 | |
761490a1 UD |
1760 | if (file != problem) |
1761 | { | |
1762 | char *p; | |
1763 | runp = file; | |
1764 | while ((p = strsep (&runp, ": \t\n")) != NULL) | |
1765 | if (p[0] != '\0') | |
20fe49b9 | 1766 | npreloads += do_preload (p, main_map, preload_file); |
761490a1 UD |
1767 | } |
1768 | ||
1769 | if (problem != NULL) | |
1770 | { | |
1771 | char *p = strndupa (problem, file_size - (problem - file)); | |
20fe49b9 UD |
1772 | |
1773 | npreloads += do_preload (p, main_map, preload_file); | |
761490a1 | 1774 | } |
14bab8de | 1775 | |
1e372ded | 1776 | rtld_timer_accum (&load_time, start); |
db276fa1 | 1777 | |
761490a1 UD |
1778 | /* We don't need the file anymore. */ |
1779 | __munmap (file, file_size); | |
1780 | } | |
14bab8de UD |
1781 | } |
1782 | ||
a1ffb40e | 1783 | if (__glibc_unlikely (*first_preload != NULL)) |
14bab8de UD |
1784 | { |
1785 | /* Set up PRELOADS with a vector of the preloaded libraries. */ | |
ab1d521d | 1786 | struct link_map *l = *first_preload; |
14bab8de | 1787 | preloads = __alloca (npreloads * sizeof preloads[0]); |
14bab8de UD |
1788 | i = 0; |
1789 | do | |
1790 | { | |
1791 | preloads[i++] = l; | |
1792 | l = l->l_next; | |
1793 | } while (l); | |
1794 | assert (i == npreloads); | |
1795 | } | |
1796 | ||
2064087b RM |
1797 | /* Load all the libraries specified by DT_NEEDED entries. If LD_PRELOAD |
1798 | specified some libraries to load, these are inserted before the actual | |
1799 | dependencies in the executable's searchlist for symbol resolution. */ | |
1e372ded AZ |
1800 | { |
1801 | RTLD_TIMING_VAR (start); | |
1802 | rtld_timer_start (&start); | |
1803 | _dl_map_object_deps (main_map, preloads, npreloads, mode == trace, 0); | |
1804 | rtld_timer_accum (&load_time, start); | |
1805 | } | |
e3e35cfc | 1806 | |
20fe49b9 | 1807 | /* Mark all objects as being in the global scope. */ |
c0f62c56 | 1808 | for (i = main_map->l_searchlist.r_nlist; i > 0; ) |
20fe49b9 | 1809 | main_map->l_searchlist.r_list[--i]->l_global = 1; |
d66e34cd | 1810 | |
f9496a7b | 1811 | /* Remove _dl_rtld_map from the chain. */ |
d6b5d570 | 1812 | GL(dl_rtld_map).l_prev->l_next = GL(dl_rtld_map).l_next; |
20fe49b9 | 1813 | if (GL(dl_rtld_map).l_next != NULL) |
d6b5d570 | 1814 | GL(dl_rtld_map).l_next->l_prev = GL(dl_rtld_map).l_prev; |
f9496a7b | 1815 | |
20fe49b9 UD |
1816 | for (i = 1; i < main_map->l_searchlist.r_nlist; ++i) |
1817 | if (main_map->l_searchlist.r_list[i] == &GL(dl_rtld_map)) | |
1818 | break; | |
1819 | ||
1820 | bool rtld_multiple_ref = false; | |
a1ffb40e | 1821 | if (__glibc_likely (i < main_map->l_searchlist.r_nlist)) |
0200214b | 1822 | { |
f9496a7b RM |
1823 | /* Some DT_NEEDED entry referred to the interpreter object itself, so |
1824 | put it back in the list of visible objects. We insert it into the | |
1825 | chain in symbol search order because gdb uses the chain's order as | |
1826 | its symbol search order. */ | |
20fe49b9 UD |
1827 | rtld_multiple_ref = true; |
1828 | ||
c0f62c56 | 1829 | GL(dl_rtld_map).l_prev = main_map->l_searchlist.r_list[i - 1]; |
b2bcd61a | 1830 | if (__builtin_expect (mode, normal) == normal) |
3b3ddb4f | 1831 | { |
c0f62c56 UD |
1832 | GL(dl_rtld_map).l_next = (i + 1 < main_map->l_searchlist.r_nlist |
1833 | ? main_map->l_searchlist.r_list[i + 1] | |
3b3ddb4f | 1834 | : NULL); |
7775448e | 1835 | #ifdef NEED_DL_SYSINFO_DSO |
ab1d521d RM |
1836 | if (GLRO(dl_sysinfo_map) != NULL |
1837 | && GL(dl_rtld_map).l_prev->l_next == GLRO(dl_sysinfo_map) | |
1838 | && GL(dl_rtld_map).l_next != GLRO(dl_sysinfo_map)) | |
1839 | GL(dl_rtld_map).l_prev = GLRO(dl_sysinfo_map); | |
3b3ddb4f UD |
1840 | #endif |
1841 | } | |
b2bcd61a UD |
1842 | else |
1843 | /* In trace mode there might be an invisible object (which we | |
1844 | could not find) after the previous one in the search list. | |
1845 | In this case it doesn't matter much where we put the | |
1846 | interpreter object, so we just initialize the list pointer so | |
1847 | that the assertion below holds. */ | |
d6b5d570 | 1848 | GL(dl_rtld_map).l_next = GL(dl_rtld_map).l_prev->l_next; |
b2bcd61a | 1849 | |
d6b5d570 UD |
1850 | assert (GL(dl_rtld_map).l_prev->l_next == GL(dl_rtld_map).l_next); |
1851 | GL(dl_rtld_map).l_prev->l_next = &GL(dl_rtld_map); | |
3fb55878 | 1852 | if (GL(dl_rtld_map).l_next != NULL) |
f9496a7b | 1853 | { |
d6b5d570 UD |
1854 | assert (GL(dl_rtld_map).l_next->l_prev == GL(dl_rtld_map).l_prev); |
1855 | GL(dl_rtld_map).l_next->l_prev = &GL(dl_rtld_map); | |
f9496a7b | 1856 | } |
0200214b | 1857 | } |
d66e34cd | 1858 | |
c84142e8 UD |
1859 | /* Now let us see whether all libraries are available in the |
1860 | versions we need. */ | |
1861 | { | |
993b3242 UD |
1862 | struct version_check_args args; |
1863 | args.doexit = mode == normal; | |
145b8413 | 1864 | args.dotrace = mode == trace; |
993b3242 | 1865 | _dl_receive_error (print_missing_version, version_check_doit, &args); |
c84142e8 UD |
1866 | } |
1867 | ||
2d148689 RM |
1868 | /* We do not initialize any of the TLS functionality unless any of the |
1869 | initial modules uses TLS. This makes dynamic loading of modules with | |
1870 | TLS impossible, but to support it requires either eagerly doing setup | |
1871 | now or lazily doing it later. Doing it now makes us incompatible with | |
1872 | an old kernel that can't perform TLS_INIT_TP, even if no TLS is ever | |
1873 | used. Trying to do it lazily is too hairy to try when there could be | |
1874 | multiple threads (from a non-TLS-using libpthread). */ | |
9dcafc55 | 1875 | bool was_tls_init_tp_called = tls_init_tp_called; |
35f1e827 | 1876 | if (tcbp == NULL) |
9dcafc55 | 1877 | tcbp = init_tls (); |
0ecb606c | 1878 | |
81b82fb9 | 1879 | if (__glibc_likely (need_security_init)) |
4c48ef06 UD |
1880 | /* Initialize security features. But only if we have not done it |
1881 | earlier. */ | |
1882 | security_init (); | |
827b7087 | 1883 | |
9a821cf9 | 1884 | if (__builtin_expect (mode, normal) != normal) |
0200214b RM |
1885 | { |
1886 | /* We were run just to list the shared libraries. It is | |
1887 | important that we do this before real relocation, because the | |
1888 | functions we call below for output may no longer work properly | |
1889 | after relocation. */ | |
81f3ac4c UD |
1890 | struct link_map *l; |
1891 | ||
afdca0f2 | 1892 | if (GLRO(dl_debug_mask) & DL_DEBUG_PRELINK) |
ceb2d9aa | 1893 | { |
c0f62c56 | 1894 | struct r_scope_elem *scope = &main_map->l_searchlist; |
ceb2d9aa | 1895 | |
81f3ac4c | 1896 | for (i = 0; i < scope->r_nlist; i++) |
32e6df36 | 1897 | { |
81f3ac4c UD |
1898 | l = scope->r_list [i]; |
1899 | if (l->l_faked) | |
32e6df36 | 1900 | { |
81f3ac4c UD |
1901 | _dl_printf ("\t%s => not found\n", l->l_libname->name); |
1902 | continue; | |
1903 | } | |
afdca0f2 UD |
1904 | if (_dl_name_match_p (GLRO(dl_trace_prelink), l)) |
1905 | GLRO(dl_trace_prelink_map) = l; | |
81f3ac4c | 1906 | _dl_printf ("\t%s => %s (0x%0*Zx, 0x%0*Zx)", |
b9375348 SP |
1907 | DSO_FILENAME (l->l_libname->name), |
1908 | DSO_FILENAME (l->l_name), | |
d347a4ab UD |
1909 | (int) sizeof l->l_map_start * 2, |
1910 | (size_t) l->l_map_start, | |
1911 | (int) sizeof l->l_addr * 2, | |
1912 | (size_t) l->l_addr); | |
11bf311e | 1913 | |
81f3ac4c UD |
1914 | if (l->l_tls_modid) |
1915 | _dl_printf (" TLS(0x%Zx, 0x%0*Zx)\n", l->l_tls_modid, | |
1916 | (int) sizeof l->l_tls_offset * 2, | |
d347a4ab | 1917 | (size_t) l->l_tls_offset); |
81f3ac4c | 1918 | else |
81f3ac4c | 1919 | _dl_printf ("\n"); |
32e6df36 | 1920 | } |
ceb2d9aa | 1921 | } |
7a11603d UD |
1922 | else if (GLRO(dl_debug_mask) & DL_DEBUG_UNUSED) |
1923 | { | |
1924 | /* Look through the dependencies of the main executable | |
1925 | and determine which of them is not actually | |
1926 | required. */ | |
c0f62c56 | 1927 | struct link_map *l = main_map; |
7a11603d UD |
1928 | |
1929 | /* Relocate the main executable. */ | |
2ca285b0 | 1930 | struct relocate_args args = { .l = l, |
3a62d00d AS |
1931 | .reloc_mode = ((GLRO(dl_lazy) |
1932 | ? RTLD_LAZY : 0) | |
1933 | | __RTLD_NOIFUNC) }; | |
7a11603d UD |
1934 | _dl_receive_error (print_unresolved, relocate_doit, &args); |
1935 | ||
1936 | /* This loop depends on the dependencies of the executable to | |
1937 | correspond in number and order to the DT_NEEDED entries. */ | |
c0f62c56 | 1938 | ElfW(Dyn) *dyn = main_map->l_ld; |
7a11603d UD |
1939 | bool first = true; |
1940 | while (dyn->d_tag != DT_NULL) | |
1941 | { | |
1942 | if (dyn->d_tag == DT_NEEDED) | |
1943 | { | |
1944 | l = l->l_next; | |
7775448e | 1945 | #ifdef NEED_DL_SYSINFO_DSO |
ff9f1c5f DM |
1946 | /* Skip the VDSO since it's not part of the list |
1947 | of objects we brought in via DT_NEEDED entries. */ | |
1948 | if (l == GLRO(dl_sysinfo_map)) | |
1949 | l = l->l_next; | |
1950 | #endif | |
7a11603d UD |
1951 | if (!l->l_used) |
1952 | { | |
1953 | if (first) | |
1954 | { | |
1955 | _dl_printf ("Unused direct dependencies:\n"); | |
1956 | first = false; | |
1957 | } | |
1958 | ||
1959 | _dl_printf ("\t%s\n", l->l_name); | |
1960 | } | |
1961 | } | |
1962 | ||
1963 | ++dyn; | |
1964 | } | |
1965 | ||
1966 | _exit (first != true); | |
1967 | } | |
c0f62c56 | 1968 | else if (! main_map->l_info[DT_NEEDED]) |
81f3ac4c UD |
1969 | _dl_printf ("\tstatically linked\n"); |
1970 | else | |
1971 | { | |
c0f62c56 | 1972 | for (l = main_map->l_next; l; l = l->l_next) |
81f3ac4c UD |
1973 | if (l->l_faked) |
1974 | /* The library was not found. */ | |
1975 | _dl_printf ("\t%s => not found\n", l->l_libname->name); | |
75489693 | 1976 | else if (strcmp (l->l_libname->name, l->l_name) == 0) |
7a11603d UD |
1977 | _dl_printf ("\t%s (0x%0*Zx)\n", l->l_libname->name, |
1978 | (int) sizeof l->l_map_start * 2, | |
1979 | (size_t) l->l_map_start); | |
81f3ac4c UD |
1980 | else |
1981 | _dl_printf ("\t%s => %s (0x%0*Zx)\n", l->l_libname->name, | |
1982 | l->l_name, (int) sizeof l->l_map_start * 2, | |
d347a4ab | 1983 | (size_t) l->l_map_start); |
81f3ac4c | 1984 | } |
1a3a58fd | 1985 | |
9a821cf9 | 1986 | if (__builtin_expect (mode, trace) != trace) |
5a47e7f2 | 1987 | for (i = 1; i < (unsigned int) _dl_argc; ++i) |
cddcfecf RM |
1988 | { |
1989 | const ElfW(Sym) *ref = NULL; | |
c0282c06 UD |
1990 | ElfW(Addr) loadbase; |
1991 | lookup_t result; | |
c0282c06 | 1992 | |
4243cbea | 1993 | result = _dl_lookup_symbol_x (_dl_argv[i], main_map, |
11bf311e UD |
1994 | &ref, main_map->l_scope, |
1995 | NULL, ELF_RTYPE_CLASS_PLT, | |
021723ab | 1996 | DL_LOOKUP_ADD_DEPENDENCY, NULL); |
c0282c06 | 1997 | |
10a446dd | 1998 | loadbase = LOOKUP_VALUE_ADDRESS (result, false); |
c0282c06 | 1999 | |
35fc382a | 2000 | _dl_printf ("%s found at 0x%0*Zd in object at 0x%0*Zd\n", |
4243cbea | 2001 | _dl_argv[i], |
d347a4ab UD |
2002 | (int) sizeof ref->st_value * 2, |
2003 | (size_t) ref->st_value, | |
2004 | (int) sizeof loadbase * 2, (size_t) loadbase); | |
cddcfecf | 2005 | } |
ce37fa88 | 2006 | else |
fd26970f | 2007 | { |
20fe49b9 | 2008 | /* If LD_WARN is set, warn about undefined symbols. */ |
afdca0f2 | 2009 | if (GLRO(dl_lazy) >= 0 && GLRO(dl_verbose)) |
ce37fa88 UD |
2010 | { |
2011 | /* We have to do symbol dependency testing. */ | |
2012 | struct relocate_args args; | |
48b67d71 | 2013 | unsigned int i; |
993b3242 | 2014 | |
3a62d00d AS |
2015 | args.reloc_mode = ((GLRO(dl_lazy) ? RTLD_LAZY : 0) |
2016 | | __RTLD_NOIFUNC); | |
fd26970f | 2017 | |
48b67d71 AS |
2018 | i = main_map->l_searchlist.r_nlist; |
2019 | while (i-- > 0) | |
ce37fa88 | 2020 | { |
48b67d71 | 2021 | struct link_map *l = main_map->l_initfini[i]; |
d6b5d570 | 2022 | if (l != &GL(dl_rtld_map) && ! l->l_faked) |
ce37fa88 UD |
2023 | { |
2024 | args.l = l; | |
2025 | _dl_receive_error (print_unresolved, relocate_doit, | |
2026 | &args); | |
ce37fa88 | 2027 | } |
20fe49b9 | 2028 | } |
32e6df36 | 2029 | |
afdca0f2 | 2030 | if ((GLRO(dl_debug_mask) & DL_DEBUG_PRELINK) |
20fe49b9 | 2031 | && rtld_multiple_ref) |
e38c954b UD |
2032 | { |
2033 | /* Mark the link map as not yet relocated again. */ | |
2034 | GL(dl_rtld_map).l_relocated = 0; | |
11bf311e | 2035 | _dl_relocate_object (&GL(dl_rtld_map), |
3a62d00d | 2036 | main_map->l_scope, __RTLD_NOIFUNC, 0); |
e38c954b | 2037 | } |
3a56ea26 | 2038 | } |
b0982c4a | 2039 | #define VERNEEDTAG (DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGIDX (DT_VERNEED)) |
120b4c49 | 2040 | if (version_info) |
fd26970f | 2041 | { |
ce37fa88 UD |
2042 | /* Print more information. This means here, print information |
2043 | about the versions needed. */ | |
2044 | int first = 1; | |
c0f62c56 | 2045 | struct link_map *map; |
ce37fa88 | 2046 | |
c0f62c56 | 2047 | for (map = main_map; map != NULL; map = map->l_next) |
fd26970f | 2048 | { |
f41c8091 | 2049 | const char *strtab; |
ce37fa88 | 2050 | ElfW(Dyn) *dyn = map->l_info[VERNEEDTAG]; |
f41c8091 UD |
2051 | ElfW(Verneed) *ent; |
2052 | ||
2053 | if (dyn == NULL) | |
2054 | continue; | |
2055 | ||
a42195db | 2056 | strtab = (const void *) D_PTR (map, l_info[DT_STRTAB]); |
f41c8091 | 2057 | ent = (ElfW(Verneed) *) (map->l_addr + dyn->d_un.d_ptr); |
ce37fa88 | 2058 | |
f41c8091 | 2059 | if (first) |
ce37fa88 | 2060 | { |
35fc382a | 2061 | _dl_printf ("\n\tVersion information:\n"); |
f41c8091 UD |
2062 | first = 0; |
2063 | } | |
ce37fa88 | 2064 | |
b9375348 | 2065 | _dl_printf ("\t%s:\n", DSO_FILENAME (map->l_name)); |
f41c8091 UD |
2066 | |
2067 | while (1) | |
2068 | { | |
2069 | ElfW(Vernaux) *aux; | |
2070 | struct link_map *needed; | |
ce37fa88 | 2071 | |
f41c8091 UD |
2072 | needed = find_needed (strtab + ent->vn_file); |
2073 | aux = (ElfW(Vernaux) *) ((char *) ent + ent->vn_aux); | |
ce37fa88 UD |
2074 | |
2075 | while (1) | |
2076 | { | |
f41c8091 UD |
2077 | const char *fname = NULL; |
2078 | ||
f41c8091 | 2079 | if (needed != NULL |
ba9fcb3f UD |
2080 | && match_version (strtab + aux->vna_name, |
2081 | needed)) | |
f41c8091 UD |
2082 | fname = needed->l_name; |
2083 | ||
35fc382a UD |
2084 | _dl_printf ("\t\t%s (%s) %s=> %s\n", |
2085 | strtab + ent->vn_file, | |
2086 | strtab + aux->vna_name, | |
2087 | aux->vna_flags & VER_FLG_WEAK | |
2088 | ? "[WEAK] " : "", | |
2089 | fname ?: "not found"); | |
ce37fa88 | 2090 | |
f41c8091 UD |
2091 | if (aux->vna_next == 0) |
2092 | /* No more symbols. */ | |
ce37fa88 UD |
2093 | break; |
2094 | ||
f41c8091 UD |
2095 | /* Next symbol. */ |
2096 | aux = (ElfW(Vernaux) *) ((char *) aux | |
2097 | + aux->vna_next); | |
ce37fa88 | 2098 | } |
f41c8091 UD |
2099 | |
2100 | if (ent->vn_next == 0) | |
2101 | /* No more dependencies. */ | |
2102 | break; | |
2103 | ||
2104 | /* Next dependency. */ | |
2105 | ent = (ElfW(Verneed) *) ((char *) ent + ent->vn_next); | |
ce37fa88 | 2106 | } |
fd26970f | 2107 | } |
ce37fa88 | 2108 | } |
fd26970f | 2109 | } |
d66e34cd | 2110 | |
0200214b RM |
2111 | _exit (0); |
2112 | } | |
86d2c878 | 2113 | |
c0f62c56 | 2114 | if (main_map->l_info[ADDRIDX (DT_GNU_LIBLIST)] |
768027a4 UD |
2115 | && ! __builtin_expect (GLRO(dl_profile) != NULL, 0) |
2116 | && ! __builtin_expect (GLRO(dl_dynamic_weak), 0)) | |
32e6df36 UD |
2117 | { |
2118 | ElfW(Lib) *liblist, *liblistend; | |
2119 | struct link_map **r_list, **r_listend, *l; | |
c0f62c56 | 2120 | const char *strtab = (const void *) D_PTR (main_map, l_info[DT_STRTAB]); |
32e6df36 | 2121 | |
c0f62c56 | 2122 | assert (main_map->l_info[VALIDX (DT_GNU_LIBLISTSZ)] != NULL); |
32e6df36 | 2123 | liblist = (ElfW(Lib) *) |
c0f62c56 | 2124 | main_map->l_info[ADDRIDX (DT_GNU_LIBLIST)]->d_un.d_ptr; |
32e6df36 | 2125 | liblistend = (ElfW(Lib) *) |
34a5a146 JM |
2126 | ((char *) liblist |
2127 | + main_map->l_info[VALIDX (DT_GNU_LIBLISTSZ)]->d_un.d_val); | |
c0f62c56 UD |
2128 | r_list = main_map->l_searchlist.r_list; |
2129 | r_listend = r_list + main_map->l_searchlist.r_nlist; | |
32e6df36 UD |
2130 | |
2131 | for (; r_list < r_listend && liblist < liblistend; r_list++) | |
2132 | { | |
2133 | l = *r_list; | |
2134 | ||
c0f62c56 | 2135 | if (l == main_map) |
32e6df36 UD |
2136 | continue; |
2137 | ||
2138 | /* If the library is not mapped where it should, fail. */ | |
2139 | if (l->l_addr) | |
2140 | break; | |
2141 | ||
2142 | /* Next, check if checksum matches. */ | |
2143 | if (l->l_info [VALIDX(DT_CHECKSUM)] == NULL | |
2144 | || l->l_info [VALIDX(DT_CHECKSUM)]->d_un.d_val | |
2145 | != liblist->l_checksum) | |
2146 | break; | |
2147 | ||
2148 | if (l->l_info [VALIDX(DT_GNU_PRELINKED)] == NULL | |
2149 | || l->l_info [VALIDX(DT_GNU_PRELINKED)]->d_un.d_val | |
2150 | != liblist->l_time_stamp) | |
2151 | break; | |
2152 | ||
2153 | if (! _dl_name_match_p (strtab + liblist->l_name, l)) | |
2154 | break; | |
2155 | ||
2156 | ++liblist; | |
2157 | } | |
2158 | ||
2159 | ||
2160 | if (r_list == r_listend && liblist == liblistend) | |
164a7164 | 2161 | prelinked = true; |
32e6df36 | 2162 | |
a1ffb40e | 2163 | if (__glibc_unlikely (GLRO(dl_debug_mask) & DL_DEBUG_LIBS)) |
b85a0f39 UD |
2164 | _dl_debug_printf ("\nprelink checking: %s\n", |
2165 | prelinked ? "ok" : "failed"); | |
32e6df36 UD |
2166 | } |
2167 | ||
ed20b3d9 | 2168 | |
c31e278f | 2169 | /* Now set up the variable which helps the assembler startup code. */ |
c0f62c56 | 2170 | GL(dl_ns)[LM_ID_BASE]._ns_main_searchlist = &main_map->l_searchlist; |
c31e278f UD |
2171 | |
2172 | /* Save the information about the original global scope list since | |
2173 | we need it in the memory handling later. */ | |
c0f62c56 | 2174 | GLRO(dl_initial_searchlist) = *GL(dl_ns)[LM_ID_BASE]._ns_main_searchlist; |
c31e278f | 2175 | |
e23fe25b | 2176 | /* Remember the last search directory added at startup, now that |
8e1472d2 FW |
2177 | malloc will no longer be the one from dl-minimal.c. As a side |
2178 | effect, this marks ld.so as initialized, so that the rtld_active | |
2179 | function returns true from now on. */ | |
e23fe25b AS |
2180 | GLRO(dl_init_all_dirs) = GL(dl_all_dirs); |
2181 | ||
73d7af4f | 2182 | /* Print scope information. */ |
a1ffb40e | 2183 | if (__glibc_unlikely (GLRO(dl_debug_mask) & DL_DEBUG_SCOPES)) |
73d7af4f UD |
2184 | { |
2185 | _dl_debug_printf ("\nInitial object scopes\n"); | |
2186 | ||
2187 | for (struct link_map *l = main_map; l != NULL; l = l->l_next) | |
174baab3 | 2188 | _dl_show_scope (l, 0); |
73d7af4f UD |
2189 | } |
2190 | ||
f753fa7d L |
2191 | _rtld_main_check (main_map, _dl_argv[0]); |
2192 | ||
32e6df36 UD |
2193 | if (prelinked) |
2194 | { | |
c0f62c56 | 2195 | if (main_map->l_info [ADDRIDX (DT_GNU_CONFLICT)] != NULL) |
32e6df36 UD |
2196 | { |
2197 | ElfW(Rela) *conflict, *conflictend; | |
32e6df36 | 2198 | |
1e372ded AZ |
2199 | RTLD_TIMING_VAR (start); |
2200 | rtld_timer_start (&start); | |
2201 | ||
c0f62c56 | 2202 | assert (main_map->l_info [VALIDX (DT_GNU_CONFLICTSZ)] != NULL); |
32e6df36 | 2203 | conflict = (ElfW(Rela) *) |
c0f62c56 | 2204 | main_map->l_info [ADDRIDX (DT_GNU_CONFLICT)]->d_un.d_ptr; |
32e6df36 | 2205 | conflictend = (ElfW(Rela) *) |
d89ae1d5 | 2206 | ((char *) conflict |
c0f62c56 UD |
2207 | + main_map->l_info [VALIDX (DT_GNU_CONFLICTSZ)]->d_un.d_val); |
2208 | _dl_resolve_conflicts (main_map, conflict, conflictend); | |
1e372ded AZ |
2209 | |
2210 | rtld_timer_stop (&relocate_time, start); | |
32e6df36 UD |
2211 | } |
2212 | ||
d89ae1d5 RM |
2213 | |
2214 | /* Mark all the objects so we know they have been already relocated. */ | |
9dcafc55 | 2215 | for (struct link_map *l = main_map; l != NULL; l = l->l_next) |
e8648a5a UD |
2216 | { |
2217 | l->l_relocated = 1; | |
2218 | if (l->l_relro_size) | |
2219 | _dl_protect_relro (l); | |
9dcafc55 UD |
2220 | |
2221 | /* Add object to slot information data if necessasy. */ | |
2222 | if (l->l_tls_blocksize != 0 && tls_init_tp_called) | |
a509eb11 | 2223 | _dl_add_to_slotinfo (l, true); |
e8648a5a | 2224 | } |
32e6df36 UD |
2225 | } |
2226 | else | |
164a7164 UD |
2227 | { |
2228 | /* Now we have all the objects loaded. Relocate them all except for | |
2229 | the dynamic linker itself. We do this in reverse order so that copy | |
2230 | relocs of earlier objects overwrite the data written by later | |
2231 | objects. We do not re-relocate the dynamic linker itself in this | |
2232 | loop because that could result in the GOT entries for functions we | |
2233 | call being changed, and that would break us. It is safe to relocate | |
2234 | the dynamic linker out of order because it has no copy relocs (we | |
2235 | know that because it is self-contained). */ | |
2236 | ||
afdca0f2 | 2237 | int consider_profiling = GLRO(dl_profile) != NULL; |
c0fb8a56 | 2238 | |
164a7164 | 2239 | /* If we are profiling we also must do lazy reloaction. */ |
afdca0f2 | 2240 | GLRO(dl_lazy) |= consider_profiling; |
c0fb8a56 | 2241 | |
1e372ded AZ |
2242 | RTLD_TIMING_VAR (start); |
2243 | rtld_timer_start (&start); | |
2bc17433 AS |
2244 | unsigned i = main_map->l_searchlist.r_nlist; |
2245 | while (i-- > 0) | |
164a7164 | 2246 | { |
2bc17433 AS |
2247 | struct link_map *l = main_map->l_initfini[i]; |
2248 | ||
164a7164 UD |
2249 | /* While we are at it, help the memory handling a bit. We have to |
2250 | mark some data structures as allocated with the fake malloc() | |
2251 | implementation in ld.so. */ | |
2252 | struct libname_list *lnp = l->l_libname->next; | |
752a2a50 | 2253 | |
164a7164 UD |
2254 | while (__builtin_expect (lnp != NULL, 0)) |
2255 | { | |
2256 | lnp->dont_free = 1; | |
2257 | lnp = lnp->next; | |
2258 | } | |
0479b305 AS |
2259 | /* Also allocated with the fake malloc(). */ |
2260 | l->l_free_initfini = 0; | |
752a2a50 | 2261 | |
164a7164 | 2262 | if (l != &GL(dl_rtld_map)) |
2ca285b0 | 2263 | _dl_relocate_object (l, l->l_scope, GLRO(dl_lazy) ? RTLD_LAZY : 0, |
154d10bd | 2264 | consider_profiling); |
be935610 | 2265 | |
9dcafc55 UD |
2266 | /* Add object to slot information data if necessasy. */ |
2267 | if (l->l_tls_blocksize != 0 && tls_init_tp_called) | |
a509eb11 | 2268 | _dl_add_to_slotinfo (l, true); |
164a7164 | 2269 | } |
1e372ded | 2270 | rtld_timer_stop (&relocate_time, start); |
164a7164 | 2271 | |
164a7164 UD |
2272 | /* Now enable profiling if needed. Like the previous call, |
2273 | this has to go here because the calls it makes should use the | |
2274 | rtld versions of the functions (particularly calloc()), but it | |
2275 | needs to have _dl_profile_map set up by the relocator. */ | |
a1ffb40e | 2276 | if (__glibc_unlikely (GL(dl_profile_map) != NULL)) |
164a7164 | 2277 | /* We must prepare the profiling. */ |
53bfdc1c | 2278 | _dl_start_profile (); |
164a7164 | 2279 | } |
ac16e905 | 2280 | |
d0503676 CD |
2281 | if ((!was_tls_init_tp_called && GL(dl_tls_max_dtv_idx) > 0) |
2282 | || count_modids != _dl_count_modids ()) | |
35f1e827 | 2283 | ++GL(dl_tls_generation); |
9dcafc55 | 2284 | |
35f1e827 UD |
2285 | /* Now that we have completed relocation, the initializer data |
2286 | for the TLS blocks has its final values and we can copy them | |
91ac3a7d TMQMF |
2287 | into the main thread's TLS area, which we allocated above. |
2288 | Note: thread-local variables must only be accessed after completing | |
2289 | the next step. */ | |
35f1e827 | 2290 | _dl_allocate_tls_init (tcbp); |
a334319f | 2291 | |
3d8c8bff | 2292 | /* And finally install it for the main thread. */ |
35f1e827 UD |
2293 | if (! tls_init_tp_called) |
2294 | { | |
774f9285 | 2295 | const char *lossage = TLS_INIT_TP (tcbp); |
a1ffb40e | 2296 | if (__glibc_unlikely (lossage != NULL)) |
35f1e827 UD |
2297 | _dl_fatal_printf ("cannot set up thread-local storage: %s\n", |
2298 | lossage); | |
0ecb606c | 2299 | } |
0ecb606c | 2300 | |
e23fe25b AS |
2301 | /* Make sure no new search directories have been added. */ |
2302 | assert (GLRO(dl_init_all_dirs) == GL(dl_all_dirs)); | |
bc5fb037 | 2303 | |
cafdfdb6 RM |
2304 | if (! prelinked && rtld_multiple_ref) |
2305 | { | |
2306 | /* There was an explicit ref to the dynamic linker as a shared lib. | |
2307 | Re-relocate ourselves with user-controlled symbol definitions. | |
2308 | ||
2309 | We must do this after TLS initialization in case after this | |
2310 | re-relocation, we might call a user-supplied function | |
2311 | (e.g. calloc from _dl_relocate_object) that uses TLS data. */ | |
2312 | ||
1e372ded AZ |
2313 | RTLD_TIMING_VAR (start); |
2314 | rtld_timer_start (&start); | |
cafdfdb6 | 2315 | |
cafdfdb6 RM |
2316 | /* Mark the link map as not yet relocated again. */ |
2317 | GL(dl_rtld_map).l_relocated = 0; | |
c0a777e8 | 2318 | _dl_relocate_object (&GL(dl_rtld_map), main_map->l_scope, 0, 0); |
1e372ded AZ |
2319 | |
2320 | rtld_timer_accum (&relocate_time, start); | |
cafdfdb6 RM |
2321 | } |
2322 | ||
bf8523c8 RM |
2323 | /* Do any necessary cleanups for the startup OS interface code. |
2324 | We do these now so that no calls are made after rtld re-relocation | |
2325 | which might be resolved to different functions than we expect. | |
2326 | We cannot do this before relocating the other objects because | |
2327 | _dl_relocate_object might need to call `mprotect' for DT_TEXTREL. */ | |
2328 | _dl_sysdep_start_cleanup (); | |
2329 | ||
9dcafc55 UD |
2330 | #ifdef SHARED |
2331 | /* Auditing checkpoint: we have added all objects. */ | |
a1ffb40e | 2332 | if (__glibc_unlikely (GLRO(dl_naudit) > 0)) |
9dcafc55 UD |
2333 | { |
2334 | struct link_map *head = GL(dl_ns)[LM_ID_BASE]._ns_loaded; | |
2335 | /* Do not call the functions for any auditing object. */ | |
2336 | if (head->l_auditing == 0) | |
2337 | { | |
2338 | struct audit_ifaces *afct = GLRO(dl_audit); | |
2339 | for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt) | |
2340 | { | |
2341 | if (afct->activity != NULL) | |
e1d559f3 FW |
2342 | afct->activity (&link_map_audit_state (head, cnt)->cookie, |
2343 | LA_ACT_CONSISTENT); | |
9dcafc55 UD |
2344 | |
2345 | afct = afct->next; | |
2346 | } | |
2347 | } | |
2348 | } | |
2349 | #endif | |
2350 | ||
2351 | /* Notify the debugger all new objects are now ready to go. We must re-get | |
2352 | the address since by now the variable might be in another object. */ | |
29f97654 | 2353 | r = _dl_debug_initialize (0, LM_ID_BASE); |
9dcafc55 | 2354 | r->r_state = RT_CONSISTENT; |
154d10bd | 2355 | _dl_debug_state (); |
815e6fa3 | 2356 | LIBC_PROBE (init_complete, 2, LM_ID_BASE, r); |
0200214b | 2357 | |
f57f8055 | 2358 | #if defined USE_LDCONFIG && !defined MAP_COPY |
08cac4ac | 2359 | /* We must munmap() the cache file. */ |
154d10bd | 2360 | _dl_unload_cache (); |
08cac4ac UD |
2361 | #endif |
2362 | ||
d66e34cd RM |
2363 | /* Once we return, _dl_sysdep_start will invoke |
2364 | the DT_INIT functions and then *USER_ENTRY. */ | |
2365 | } | |
fd26970f UD |
2366 | \f |
2367 | /* This is a little helper function for resolving symbols while | |
2368 | tracing the binary. */ | |
2369 | static void | |
c84142e8 UD |
2370 | print_unresolved (int errcode __attribute__ ((unused)), const char *objname, |
2371 | const char *errstring) | |
fd26970f | 2372 | { |
3996f34b | 2373 | if (objname[0] == '\0') |
b9375348 | 2374 | objname = RTLD_PROGNAME; |
35fc382a | 2375 | _dl_error_printf ("%s (%s)\n", errstring, objname); |
fd26970f | 2376 | } |
c84142e8 UD |
2377 | \f |
2378 | /* This is a little helper function for resolving symbols while | |
2379 | tracing the binary. */ | |
2380 | static void | |
2381 | print_missing_version (int errcode __attribute__ ((unused)), | |
2382 | const char *objname, const char *errstring) | |
2383 | { | |
b9375348 | 2384 | _dl_error_printf ("%s: %s: %s\n", RTLD_PROGNAME, |
35fc382a | 2385 | objname, errstring); |
c84142e8 | 2386 | } |
ea278354 | 2387 | \f |
7dea968e | 2388 | /* Nonzero if any of the debugging options is enabled. */ |
392a6b52 | 2389 | static int any_debug attribute_relro; |
7dea968e | 2390 | |
b5efde2f UD |
2391 | /* Process the string given as the parameter which explains which debugging |
2392 | options are enabled. */ | |
2393 | static void | |
14c44e2e | 2394 | process_dl_debug (const char *dl_debug) |
b5efde2f | 2395 | { |
3e2040c8 UD |
2396 | /* When adding new entries make sure that the maximal length of a name |
2397 | is correctly handled in the LD_DEBUG_HELP code below. */ | |
2398 | static const struct | |
2399 | { | |
379d4ec4 UD |
2400 | unsigned char len; |
2401 | const char name[10]; | |
3e2040c8 UD |
2402 | const char helptext[41]; |
2403 | unsigned short int mask; | |
2404 | } debopts[] = | |
2405 | { | |
379d4ec4 UD |
2406 | #define LEN_AND_STR(str) sizeof (str) - 1, str |
2407 | { LEN_AND_STR ("libs"), "display library search paths", | |
3e2040c8 | 2408 | DL_DEBUG_LIBS | DL_DEBUG_IMPCALLS }, |
379d4ec4 | 2409 | { LEN_AND_STR ("reloc"), "display relocation processing", |
3e2040c8 | 2410 | DL_DEBUG_RELOC | DL_DEBUG_IMPCALLS }, |
379d4ec4 | 2411 | { LEN_AND_STR ("files"), "display progress for input file", |
3e2040c8 | 2412 | DL_DEBUG_FILES | DL_DEBUG_IMPCALLS }, |
379d4ec4 | 2413 | { LEN_AND_STR ("symbols"), "display symbol table processing", |
3e2040c8 | 2414 | DL_DEBUG_SYMBOLS | DL_DEBUG_IMPCALLS }, |
379d4ec4 | 2415 | { LEN_AND_STR ("bindings"), "display information about symbol binding", |
3e2040c8 | 2416 | DL_DEBUG_BINDINGS | DL_DEBUG_IMPCALLS }, |
379d4ec4 | 2417 | { LEN_AND_STR ("versions"), "display version dependencies", |
3e2040c8 | 2418 | DL_DEBUG_VERSIONS | DL_DEBUG_IMPCALLS }, |
73d7af4f UD |
2419 | { LEN_AND_STR ("scopes"), "display scope information", |
2420 | DL_DEBUG_SCOPES }, | |
379d4ec4 | 2421 | { LEN_AND_STR ("all"), "all previous options combined", |
3e2040c8 | 2422 | DL_DEBUG_LIBS | DL_DEBUG_RELOC | DL_DEBUG_FILES | DL_DEBUG_SYMBOLS |
73d7af4f UD |
2423 | | DL_DEBUG_BINDINGS | DL_DEBUG_VERSIONS | DL_DEBUG_IMPCALLS |
2424 | | DL_DEBUG_SCOPES }, | |
379d4ec4 | 2425 | { LEN_AND_STR ("statistics"), "display relocation statistics", |
3e2040c8 | 2426 | DL_DEBUG_STATISTICS }, |
7a11603d UD |
2427 | { LEN_AND_STR ("unused"), "determined unused DSOs", |
2428 | DL_DEBUG_UNUSED }, | |
379d4ec4 | 2429 | { LEN_AND_STR ("help"), "display this help message and exit", |
3e2040c8 UD |
2430 | DL_DEBUG_HELP }, |
2431 | }; | |
2432 | #define ndebopts (sizeof (debopts) / sizeof (debopts[0])) | |
3e2040c8 | 2433 | |
379d4ec4 UD |
2434 | /* Skip separating white spaces and commas. */ |
2435 | while (*dl_debug != '\0') | |
b5efde2f | 2436 | { |
379d4ec4 | 2437 | if (*dl_debug != ' ' && *dl_debug != ',' && *dl_debug != ':') |
b5efde2f | 2438 | { |
3e2040c8 | 2439 | size_t cnt; |
379d4ec4 | 2440 | size_t len = 1; |
77aba05b | 2441 | |
379d4ec4 UD |
2442 | while (dl_debug[len] != '\0' && dl_debug[len] != ' ' |
2443 | && dl_debug[len] != ',' && dl_debug[len] != ':') | |
2444 | ++len; | |
14c44e2e | 2445 | |
3e2040c8 | 2446 | for (cnt = 0; cnt < ndebopts; ++cnt) |
379d4ec4 UD |
2447 | if (debopts[cnt].len == len |
2448 | && memcmp (dl_debug, debopts[cnt].name, len) == 0) | |
3e2040c8 | 2449 | { |
afdca0f2 | 2450 | GLRO(dl_debug_mask) |= debopts[cnt].mask; |
5688da55 | 2451 | any_debug = 1; |
3e2040c8 UD |
2452 | break; |
2453 | } | |
77aba05b | 2454 | |
3e2040c8 UD |
2455 | if (cnt == ndebopts) |
2456 | { | |
2457 | /* Display a warning and skip everything until next | |
2458 | separator. */ | |
2459 | char *copy = strndupa (dl_debug, len); | |
2460 | _dl_error_printf ("\ | |
2461 | warning: debug option `%s' unknown; try LD_DEBUG=help\n", copy); | |
379d4ec4 UD |
2462 | } |
2463 | ||
2464 | dl_debug += len; | |
2465 | continue; | |
3e2040c8 | 2466 | } |
379d4ec4 UD |
2467 | |
2468 | ++dl_debug; | |
3e2040c8 | 2469 | } |
77aba05b | 2470 | |
ff9f1c5f DM |
2471 | if (GLRO(dl_debug_mask) & DL_DEBUG_UNUSED) |
2472 | { | |
2473 | /* In order to get an accurate picture of whether a particular | |
2474 | DT_NEEDED entry is actually used we have to process both | |
2475 | the PLT and non-PLT relocation entries. */ | |
2476 | GLRO(dl_lazy) = 0; | |
2477 | } | |
2478 | ||
afdca0f2 | 2479 | if (GLRO(dl_debug_mask) & DL_DEBUG_HELP) |
3e2040c8 UD |
2480 | { |
2481 | size_t cnt; | |
14c44e2e | 2482 | |
3e2040c8 UD |
2483 | _dl_printf ("\ |
2484 | Valid options for the LD_DEBUG environment variable are:\n\n"); | |
db276fa1 | 2485 | |
3e2040c8 | 2486 | for (cnt = 0; cnt < ndebopts; ++cnt) |
37d8b778 UD |
2487 | _dl_printf (" %.*s%s%s\n", debopts[cnt].len, debopts[cnt].name, |
2488 | " " + debopts[cnt].len - 3, | |
3e2040c8 | 2489 | debopts[cnt].helptext); |
14c44e2e | 2490 | |
3e2040c8 UD |
2491 | _dl_printf ("\n\ |
2492 | To direct the debugging output into a file instead of standard output\n\ | |
2493 | a filename can be specified using the LD_DEBUG_OUTPUT environment variable.\n"); | |
2494 | _exit (0); | |
b5efde2f | 2495 | } |
b5efde2f UD |
2496 | } |
2497 | \f | |
9dcafc55 UD |
2498 | static void |
2499 | process_dl_audit (char *str) | |
2500 | { | |
2501 | /* The parameter is a colon separated list of DSO names. */ | |
2502 | char *p; | |
2503 | ||
2504 | while ((p = (strsep) (&str, ":")) != NULL) | |
81b82fb9 | 2505 | if (dso_name_valid_for_suid (p)) |
9dcafc55 UD |
2506 | { |
2507 | /* This is using the local malloc, not the system malloc. The | |
2508 | memory can never be freed. */ | |
2509 | struct audit_list *newp = malloc (sizeof (*newp)); | |
2510 | newp->name = p; | |
2511 | ||
2512 | if (audit_list == NULL) | |
2513 | audit_list = newp->next = newp; | |
2514 | else | |
2515 | { | |
2516 | newp->next = audit_list->next; | |
2517 | audit_list = audit_list->next = newp; | |
2518 | } | |
2519 | } | |
2520 | } | |
2521 | \f | |
ea278354 UD |
2522 | /* Process all environments variables the dynamic linker must recognize. |
2523 | Since all of them start with `LD_' we are a bit smarter while finding | |
2524 | all the entries. */ | |
9360906d | 2525 | extern char **_environ attribute_hidden; |
67c94753 | 2526 | |
d6b5d570 | 2527 | |
ea278354 | 2528 | static void |
ba9fcb3f | 2529 | process_envvars (enum mode *modep) |
ea278354 | 2530 | { |
67c94753 | 2531 | char **runp = _environ; |
ea278354 UD |
2532 | char *envline; |
2533 | enum mode mode = normal; | |
7dea968e | 2534 | char *debug_output = NULL; |
ea278354 UD |
2535 | |
2536 | /* This is the default place for profiling data file. */ | |
afdca0f2 | 2537 | GLRO(dl_profile_output) |
6bc6bd3b | 2538 | = &"/var/tmp\0/var/profile"[__libc_enable_secure ? 9 : 0]; |
ea278354 UD |
2539 | |
2540 | while ((envline = _dl_next_ld_env_entry (&runp)) != NULL) | |
2541 | { | |
379d4ec4 UD |
2542 | size_t len = 0; |
2543 | ||
2544 | while (envline[len] != '\0' && envline[len] != '=') | |
2545 | ++len; | |
ea278354 | 2546 | |
75e8d1f5 UD |
2547 | if (envline[len] != '=') |
2548 | /* This is a "LD_" variable at the end of the string without | |
2549 | a '=' character. Ignore it since otherwise we will access | |
2550 | invalid memory below. */ | |
67c94753 | 2551 | continue; |
75e8d1f5 | 2552 | |
67c94753 | 2553 | switch (len) |
ea278354 | 2554 | { |
14c44e2e UD |
2555 | case 4: |
2556 | /* Warning level, verbose or not. */ | |
67c94753 | 2557 | if (memcmp (envline, "WARN", 4) == 0) |
afdca0f2 | 2558 | GLRO(dl_verbose) = envline[5] != '\0'; |
14c44e2e | 2559 | break; |
ea278354 | 2560 | |
14c44e2e UD |
2561 | case 5: |
2562 | /* Debugging of the dynamic linker? */ | |
67c94753 | 2563 | if (memcmp (envline, "DEBUG", 5) == 0) |
9dcafc55 UD |
2564 | { |
2565 | process_dl_debug (&envline[6]); | |
2566 | break; | |
2567 | } | |
2568 | if (memcmp (envline, "AUDIT", 5) == 0) | |
81b82fb9 | 2569 | audit_list_string = &envline[6]; |
14c44e2e | 2570 | break; |
b5efde2f | 2571 | |
14c44e2e UD |
2572 | case 7: |
2573 | /* Print information about versions. */ | |
67c94753 | 2574 | if (memcmp (envline, "VERBOSE", 7) == 0) |
14c44e2e | 2575 | { |
67c94753 | 2576 | version_info = envline[8] != '\0'; |
14c44e2e UD |
2577 | break; |
2578 | } | |
7dea968e | 2579 | |
14c44e2e | 2580 | /* List of objects to be preloaded. */ |
67c94753 | 2581 | if (memcmp (envline, "PRELOAD", 7) == 0) |
14c44e2e | 2582 | { |
67c94753 | 2583 | preloadlist = &envline[8]; |
14c44e2e UD |
2584 | break; |
2585 | } | |
120b4c49 | 2586 | |
14c44e2e | 2587 | /* Which shared object shall be profiled. */ |
c95f3fd4 | 2588 | if (memcmp (envline, "PROFILE", 7) == 0 && envline[8] != '\0') |
afdca0f2 | 2589 | GLRO(dl_profile) = &envline[8]; |
14c44e2e | 2590 | break; |
120b4c49 | 2591 | |
14c44e2e UD |
2592 | case 8: |
2593 | /* Do we bind early? */ | |
67c94753 | 2594 | if (memcmp (envline, "BIND_NOW", 8) == 0) |
f53c03c2 | 2595 | { |
afdca0f2 | 2596 | GLRO(dl_lazy) = envline[9] == '\0'; |
f53c03c2 UD |
2597 | break; |
2598 | } | |
67c94753 | 2599 | if (memcmp (envline, "BIND_NOT", 8) == 0) |
afdca0f2 | 2600 | GLRO(dl_bind_not) = envline[9] != '\0'; |
14c44e2e | 2601 | break; |
ea278354 | 2602 | |
14c44e2e UD |
2603 | case 9: |
2604 | /* Test whether we want to see the content of the auxiliary | |
2605 | array passed up from the kernel. */ | |
6bc6bd3b | 2606 | if (!__libc_enable_secure |
00a12162 | 2607 | && memcmp (envline, "SHOW_AUXV", 9) == 0) |
14c44e2e UD |
2608 | _dl_show_auxv (); |
2609 | break; | |
ea278354 | 2610 | |
ff08fc59 | 2611 | #if !HAVE_TUNABLES |
12264bd7 | 2612 | case 10: |
3081378b | 2613 | /* Mask for the important hardware capabilities. */ |
1c1243b6 SP |
2614 | if (!__libc_enable_secure |
2615 | && memcmp (envline, "HWCAP_MASK", 10) == 0) | |
37b66c0b | 2616 | GLRO(dl_hwcap_mask) = _dl_strtoul (&envline[11], NULL); |
12264bd7 | 2617 | break; |
ff08fc59 | 2618 | #endif |
12264bd7 | 2619 | |
f787edde UD |
2620 | case 11: |
2621 | /* Path where the binary is found. */ | |
6bc6bd3b | 2622 | if (!__libc_enable_secure |
67c94753 | 2623 | && memcmp (envline, "ORIGIN_PATH", 11) == 0) |
afdca0f2 | 2624 | GLRO(dl_origin_path) = &envline[12]; |
f787edde UD |
2625 | break; |
2626 | ||
14c44e2e | 2627 | case 12: |
dec126b4 | 2628 | /* The library search path. */ |
f6110a8f FW |
2629 | if (!__libc_enable_secure |
2630 | && memcmp (envline, "LIBRARY_PATH", 12) == 0) | |
dec126b4 | 2631 | { |
67c94753 | 2632 | library_path = &envline[13]; |
dec126b4 UD |
2633 | break; |
2634 | } | |
2635 | ||
14c44e2e | 2636 | /* Where to place the profiling data file. */ |
67c94753 | 2637 | if (memcmp (envline, "DEBUG_OUTPUT", 12) == 0) |
14c44e2e | 2638 | { |
67c94753 | 2639 | debug_output = &envline[13]; |
14c44e2e UD |
2640 | break; |
2641 | } | |
ea278354 | 2642 | |
6bc6bd3b | 2643 | if (!__libc_enable_secure |
00a12162 | 2644 | && memcmp (envline, "DYNAMIC_WEAK", 12) == 0) |
afdca0f2 | 2645 | GLRO(dl_dynamic_weak) = 1; |
14c44e2e | 2646 | break; |
ea278354 | 2647 | |
97fd3a30 UD |
2648 | case 13: |
2649 | /* We might have some extra environment variable with length 13 | |
2650 | to handle. */ | |
2651 | #ifdef EXTRA_LD_ENVVARS_13 | |
2652 | EXTRA_LD_ENVVARS_13 | |
2653 | #endif | |
6bc6bd3b | 2654 | if (!__libc_enable_secure |
97fd3a30 | 2655 | && memcmp (envline, "USE_LOAD_BIAS", 13) == 0) |
827b7087 UD |
2656 | { |
2657 | GLRO(dl_use_load_bias) = envline[14] == '1' ? -1 : 0; | |
2658 | break; | |
2659 | } | |
97fd3a30 UD |
2660 | break; |
2661 | ||
14c44e2e UD |
2662 | case 14: |
2663 | /* Where to place the profiling data file. */ | |
6bc6bd3b | 2664 | if (!__libc_enable_secure |
3e2040c8 UD |
2665 | && memcmp (envline, "PROFILE_OUTPUT", 14) == 0 |
2666 | && envline[15] != '\0') | |
afdca0f2 | 2667 | GLRO(dl_profile_output) = &envline[15]; |
14c44e2e | 2668 | break; |
120b4c49 | 2669 | |
32e6df36 UD |
2670 | case 16: |
2671 | /* The mode of the dynamic linker can be set. */ | |
2672 | if (memcmp (envline, "TRACE_PRELINKING", 16) == 0) | |
2673 | { | |
2674 | mode = trace; | |
afdca0f2 UD |
2675 | GLRO(dl_verbose) = 1; |
2676 | GLRO(dl_debug_mask) |= DL_DEBUG_PRELINK; | |
2677 | GLRO(dl_trace_prelink) = &envline[17]; | |
32e6df36 UD |
2678 | } |
2679 | break; | |
2680 | ||
14c44e2e UD |
2681 | case 20: |
2682 | /* The mode of the dynamic linker can be set. */ | |
67c94753 | 2683 | if (memcmp (envline, "TRACE_LOADED_OBJECTS", 20) == 0) |
14c44e2e UD |
2684 | mode = trace; |
2685 | break; | |
e2102c14 UD |
2686 | |
2687 | /* We might have some extra environment variable to handle. This | |
2688 | is tricky due to the pre-processing of the length of the name | |
2689 | in the switch statement here. The code here assumes that added | |
2690 | environment variables have a different length. */ | |
2691 | #ifdef EXTRA_LD_ENVVARS | |
2692 | EXTRA_LD_ENVVARS | |
2693 | #endif | |
ea278354 UD |
2694 | } |
2695 | } | |
2696 | ||
3e2040c8 UD |
2697 | /* The caller wants this information. */ |
2698 | *modep = mode; | |
2699 | ||
4bae5567 UD |
2700 | /* Extra security for SUID binaries. Remove all dangerous environment |
2701 | variables. */ | |
6bc6bd3b | 2702 | if (__builtin_expect (__libc_enable_secure, 0)) |
4bae5567 | 2703 | { |
c95f3fd4 | 2704 | static const char unsecure_envvars[] = |
4bae5567 UD |
2705 | #ifdef EXTRA_UNSECURE_ENVVARS |
2706 | EXTRA_UNSECURE_ENVVARS | |
2707 | #endif | |
c95f3fd4 UD |
2708 | UNSECURE_ENVVARS; |
2709 | const char *nextp; | |
2710 | ||
2711 | nextp = unsecure_envvars; | |
2712 | do | |
2713 | { | |
2714 | unsetenv (nextp); | |
9710f75d UD |
2715 | /* We could use rawmemchr but this need not be fast. */ |
2716 | nextp = (char *) (strchr) (nextp, '\0') + 1; | |
c95f3fd4 UD |
2717 | } |
2718 | while (*nextp != '\0'); | |
74955460 UD |
2719 | |
2720 | if (__access ("/etc/suid-debug", F_OK) != 0) | |
3a56ea26 | 2721 | { |
67e58f39 | 2722 | #if !HAVE_TUNABLES |
00a12162 | 2723 | unsetenv ("MALLOC_CHECK_"); |
67e58f39 | 2724 | #endif |
f57a3c94 | 2725 | GLRO(dl_debug_mask) = 0; |
3a56ea26 | 2726 | } |
f57a3c94 RM |
2727 | |
2728 | if (mode != normal) | |
2729 | _exit (5); | |
4bae5567 | 2730 | } |
7dea968e UD |
2731 | /* If we have to run the dynamic linker in debugging mode and the |
2732 | LD_DEBUG_OUTPUT environment variable is given, we write the debug | |
2733 | messages to this file. */ | |
3e2040c8 | 2734 | else if (any_debug && debug_output != NULL) |
7dea968e | 2735 | { |
5f2de337 | 2736 | const int flags = O_WRONLY | O_APPEND | O_CREAT | O_NOFOLLOW; |
7a2fd787 UD |
2737 | size_t name_len = strlen (debug_output); |
2738 | char buf[name_len + 12]; | |
2739 | char *startp; | |
2740 | ||
2741 | buf[name_len + 11] = '\0'; | |
9710f75d | 2742 | startp = _itoa (__getpid (), &buf[name_len + 11], 10, 0); |
7a2fd787 UD |
2743 | *--startp = '.'; |
2744 | startp = memcpy (startp - name_len, debug_output, name_len); | |
2745 | ||
329ea513 | 2746 | GLRO(dl_debug_fd) = __open64_nocancel (startp, flags, DEFFILEMODE); |
dd70526e | 2747 | if (GLRO(dl_debug_fd) == -1) |
7dea968e | 2748 | /* We use standard output if opening the file failed. */ |
dd70526e | 2749 | GLRO(dl_debug_fd) = STDOUT_FILENO; |
7dea968e | 2750 | } |
ea278354 | 2751 | } |
db276fa1 | 2752 | |
1e372ded AZ |
2753 | #if HP_TIMING_INLINE |
2754 | static void | |
2755 | print_statistics_item (const char *title, hp_timing_t time, | |
2756 | hp_timing_t total) | |
2757 | { | |
2758 | char cycles[HP_TIMING_PRINT_SIZE]; | |
2759 | HP_TIMING_PRINT (cycles, sizeof (cycles), time); | |
2760 | ||
2761 | char relative[3 * sizeof (hp_timing_t) + 2]; | |
2762 | char *cp = _itoa ((1000ULL * time) / total, relative + sizeof (relative), | |
2763 | 10, 0); | |
2764 | /* Sets the decimal point. */ | |
2765 | char *wp = relative; | |
2766 | switch (relative + sizeof (relative) - cp) | |
2767 | { | |
2768 | case 3: | |
2769 | *wp++ = *cp++; | |
2770 | /* Fall through. */ | |
2771 | case 2: | |
2772 | *wp++ = *cp++; | |
2773 | /* Fall through. */ | |
2774 | case 1: | |
2775 | *wp++ = '.'; | |
2776 | *wp++ = *cp++; | |
2777 | } | |
2778 | *wp = '\0'; | |
2779 | _dl_debug_printf ("%s: %s cycles (%s%%)\n", title, cycles, relative); | |
2780 | } | |
2781 | #endif | |
db276fa1 UD |
2782 | |
2783 | /* Print the various times we collected. */ | |
2784 | static void | |
ee600e3f | 2785 | __attribute ((noinline)) |
1e372ded | 2786 | print_statistics (const hp_timing_t *rtld_total_timep) |
db276fa1 | 2787 | { |
1e372ded AZ |
2788 | #if HP_TIMING_INLINE |
2789 | { | |
2790 | char cycles[HP_TIMING_PRINT_SIZE]; | |
2791 | HP_TIMING_PRINT (cycles, sizeof (cycles), *rtld_total_timep); | |
2792 | _dl_debug_printf ("\nruntime linker statistics:\n" | |
2793 | " total startup time in dynamic loader: %s cycles\n", | |
2794 | cycles); | |
2795 | print_statistics_item (" time needed for relocation", | |
2796 | relocate_time, *rtld_total_timep); | |
2797 | } | |
1531e094 | 2798 | #endif |
a21a20a3 UD |
2799 | |
2800 | unsigned long int num_relative_relocations = 0; | |
22c83193 | 2801 | for (Lmid_t ns = 0; ns < GL(dl_nns); ++ns) |
a21a20a3 | 2802 | { |
c120d94d UD |
2803 | if (GL(dl_ns)[ns]._ns_loaded == NULL) |
2804 | continue; | |
2805 | ||
c0f62c56 | 2806 | struct r_scope_elem *scope = &GL(dl_ns)[ns]._ns_loaded->l_searchlist; |
a21a20a3 | 2807 | |
c0f62c56 UD |
2808 | for (unsigned int i = 0; i < scope->r_nlist; i++) |
2809 | { | |
2810 | struct link_map *l = scope->r_list [i]; | |
2811 | ||
c120d94d | 2812 | if (l->l_addr != 0 && l->l_info[VERSYMIDX (DT_RELCOUNT)]) |
c0f62c56 UD |
2813 | num_relative_relocations |
2814 | += l->l_info[VERSYMIDX (DT_RELCOUNT)]->d_un.d_val; | |
c120d94d UD |
2815 | #ifndef ELF_MACHINE_REL_RELATIVE |
2816 | /* Relative relocations are processed on these architectures if | |
2817 | library is loaded to different address than p_vaddr or | |
2818 | if not prelinked. */ | |
2819 | if ((l->l_addr != 0 || !l->l_info[VALIDX(DT_GNU_PRELINKED)]) | |
2820 | && l->l_info[VERSYMIDX (DT_RELACOUNT)]) | |
2821 | #else | |
2822 | /* On e.g. IA-64 or Alpha, relative relocations are processed | |
2823 | only if library is loaded to different address than p_vaddr. */ | |
2824 | if (l->l_addr != 0 && l->l_info[VERSYMIDX (DT_RELACOUNT)]) | |
2825 | #endif | |
c0f62c56 UD |
2826 | num_relative_relocations |
2827 | += l->l_info[VERSYMIDX (DT_RELACOUNT)]->d_un.d_val; | |
2828 | } | |
a21a20a3 UD |
2829 | } |
2830 | ||
42af49f8 UD |
2831 | _dl_debug_printf (" number of relocations: %lu\n" |
2832 | " number of relocations from cache: %lu\n" | |
2833 | " number of relative relocations: %lu\n", | |
2834 | GL(dl_num_relocations), | |
2835 | GL(dl_num_cache_relocations), | |
154d10bd | 2836 | num_relative_relocations); |
db276fa1 | 2837 | |
1e372ded AZ |
2838 | #if HP_TIMING_INLINE |
2839 | print_statistics_item (" time needed to load objects", | |
2840 | load_time, *rtld_total_timep); | |
1531e094 | 2841 | #endif |
db276fa1 | 2842 | } |