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d66e34cd | 1 | /* Run time dynamic linker. |
1ca7cbcb | 2 | Copyright (C) 1995-1999, 2000 Free Software Foundation, Inc. |
afd4eb37 | 3 | This file is part of the GNU C Library. |
d66e34cd | 4 | |
afd4eb37 UD |
5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Library General Public License as | |
7 | published by the Free Software Foundation; either version 2 of the | |
8 | 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 | |
13 | Library General Public License for more details. | |
d66e34cd | 14 | |
afd4eb37 UD |
15 | You should have received a copy of the GNU Library General Public |
16 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
17 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
18 | Boston, MA 02111-1307, USA. */ | |
d66e34cd | 19 | |
7dea968e | 20 | #include <fcntl.h> |
d66e34cd | 21 | #include <stdlib.h> |
f51d1dfd | 22 | #include <string.h> |
d66e34cd | 23 | #include <unistd.h> |
2064087b | 24 | #include <sys/mman.h> /* Check if MAP_ANON is defined. */ |
a42195db | 25 | #include <ldsodefs.h> |
ce37fa88 | 26 | #include <stdio-common/_itoa.h> |
f21acc89 | 27 | #include <entry.h> |
c94a8080 | 28 | #include <fpu_control.h> |
db276fa1 | 29 | #include <hp-timing.h> |
cf197e41 | 30 | #include <bits/libc-lock.h> |
f5348425 | 31 | #include "dynamic-link.h" |
e2102c14 | 32 | #include "dl-librecon.h" |
f5348425 | 33 | |
a853022c | 34 | #include <assert.h> |
f5348425 | 35 | |
d66e34cd RM |
36 | /* System-specific function to do initial startup for the dynamic linker. |
37 | After this, file access calls and getenv must work. This is responsible | |
cddcfecf | 38 | for setting __libc_enable_secure if we need to be secure (e.g. setuid), |
d66e34cd | 39 | and for setting _dl_argc and _dl_argv, and then calling _dl_main. */ |
266180eb RM |
40 | extern ElfW(Addr) _dl_sysdep_start (void **start_argptr, |
41 | void (*dl_main) (const ElfW(Phdr) *phdr, | |
42 | ElfW(Half) phent, | |
43 | ElfW(Addr) *user_entry)); | |
4cb20290 | 44 | extern void _dl_sysdep_start_cleanup (void); |
d66e34cd | 45 | |
08cac4ac UD |
46 | /* This function is used to unload the cache file if necessary. */ |
47 | extern void _dl_unload_cache (void); | |
48 | ||
14bab8de UD |
49 | /* System-dependent function to read a file's whole contents |
50 | in the most convenient manner available. */ | |
51 | extern void *_dl_sysdep_read_whole_file (const char *filename, | |
52 | size_t *filesize_ptr, | |
53 | int mmap_prot); | |
54 | ||
db33f7d4 UD |
55 | /* Protec SUID program against misuse of file descriptors. */ |
56 | extern void __libc_check_standard_fds (void); | |
57 | ||
fd26970f | 58 | /* Helper function to handle errors while resolving symbols. */ |
c84142e8 UD |
59 | static void print_unresolved (int errcode, const char *objname, |
60 | const char *errsting); | |
61 | ||
62 | /* Helper function to handle errors when a version is missing. */ | |
63 | static void print_missing_version (int errcode, const char *objname, | |
64 | const char *errsting); | |
fd26970f | 65 | |
db276fa1 UD |
66 | /* Print the various times we collected. */ |
67 | static void print_statistics (void); | |
ea278354 UD |
68 | |
69 | /* This is a list of all the modes the dynamic loader can be in. */ | |
70 | enum mode { normal, list, verify, trace }; | |
71 | ||
72 | /* Process all environments variables the dynamic linker must recognize. | |
73 | Since all of them start with `LD_' we are a bit smarter while finding | |
74 | all the entries. */ | |
75 | static void process_envvars (enum mode *modep, int *lazyp); | |
76 | ||
d66e34cd RM |
77 | int _dl_argc; |
78 | char **_dl_argv; | |
ceb27555 | 79 | unsigned int _dl_skip_args; /* Nonzero if we were run directly. */ |
cf29ffbe | 80 | int _dl_verbose; |
0a54e401 UD |
81 | const char *_dl_platform; |
82 | size_t _dl_platformlen; | |
f41c8091 | 83 | unsigned long _dl_hwcap; |
c94a8080 | 84 | fpu_control_t _dl_fpu_control = _FPU_DEFAULT; |
0a54e401 | 85 | struct r_search_path *_dl_search_paths; |
3996f34b UD |
86 | const char *_dl_profile; |
87 | const char *_dl_profile_output; | |
a3d6fb9b | 88 | struct link_map *_dl_profile_map; |
12b5b6b7 | 89 | int _dl_lazy; |
dec126b4 | 90 | int _dl_dynamic_weak; |
b5efde2f | 91 | int _dl_debug_libs; |
7dea968e | 92 | int _dl_debug_impcalls; |
0c367d92 | 93 | int _dl_debug_bindings; |
de100ca7 | 94 | int _dl_debug_symbols; |
8193034b UD |
95 | int _dl_debug_versions; |
96 | int _dl_debug_reloc; | |
97 | int _dl_debug_files; | |
db276fa1 | 98 | int _dl_debug_statistics; |
b0a01055 | 99 | const char *_dl_inhibit_rpath; /* RPATH values which should be |
310930c1 | 100 | ignored. */ |
f787edde | 101 | const char *_dl_origin_path; |
d66e34cd | 102 | |
be935610 UD |
103 | /* This is a pointer to the map for the main object and through it to |
104 | all loaded objects. */ | |
105 | struct link_map *_dl_loaded; | |
106 | /* Pointer to the l_searchlist element of the link map of the main object. */ | |
107 | struct r_scope_elem *_dl_main_searchlist; | |
604510f7 UD |
108 | /* Copy of the content of `_dl_main_searchlist'. */ |
109 | struct r_scope_elem _dl_initial_searchlist; | |
be935610 UD |
110 | /* Array which is used when looking up in the global scope. */ |
111 | struct r_scope_elem *_dl_global_scope[2]; | |
112 | ||
cf197e41 UD |
113 | /* During the program run we must not modify the global data of |
114 | loaded shared object simultanously in two threads. Therefore we | |
115 | protect `_dl_open' and `_dl_close' in dl-close.c. | |
116 | ||
117 | This must be a recursive lock since the initializer function of | |
118 | the loaded object might as well require a call to this function. | |
119 | At this time it is not anymore a problem to modify the tables. */ | |
120 | __libc_lock_define_initialized_recursive (, _dl_load_lock) | |
121 | ||
39778c6c UD |
122 | /* Set nonzero during loading and initialization of executable and |
123 | libraries, cleared before the executable's entry point runs. This | |
124 | must not be initialized to nonzero, because the unused dynamic | |
125 | linker loaded in for libc.so's "ld.so.1" dep will provide the | |
126 | definition seen by libc.so's initializer; that value must be zero, | |
127 | and will be since that dynamic linker's _dl_start and dl_main will | |
128 | never be called. */ | |
129 | int _dl_starting_up; | |
130 | ||
c0fb8a56 | 131 | |
266180eb RM |
132 | static void dl_main (const ElfW(Phdr) *phdr, |
133 | ElfW(Half) phent, | |
134 | ElfW(Addr) *user_entry); | |
d66e34cd | 135 | |
ee188d55 | 136 | struct link_map _dl_rtld_map; |
c84142e8 | 137 | struct libname_list _dl_rtld_libname; |
f41c8091 | 138 | struct libname_list _dl_rtld_libname2; |
86d2c878 | 139 | |
db276fa1 | 140 | /* Variable for statistics. */ |
5732c4df | 141 | #ifndef HP_TIMING_NONAVAIL |
db276fa1 UD |
142 | static hp_timing_t rtld_total_time; |
143 | static hp_timing_t relocate_time; | |
144 | static hp_timing_t load_time; | |
5732c4df | 145 | #endif |
db276fa1 UD |
146 | extern unsigned long int _dl_num_relocations; /* in dl-lookup.c */ |
147 | ||
6a1db4ff UD |
148 | static ElfW(Addr) _dl_start_final (void *arg, struct link_map *bootstrap_map_p, |
149 | hp_timing_t start_time); | |
150 | ||
b1dbbaa4 RM |
151 | #ifdef RTLD_START |
152 | RTLD_START | |
153 | #else | |
154 | #error "sysdeps/MACHINE/dl-machine.h fails to define RTLD_START" | |
155 | #endif | |
156 | ||
ceb2d9aa | 157 | static ElfW(Addr) |
d66e34cd RM |
158 | _dl_start (void *arg) |
159 | { | |
86d2c878 | 160 | struct link_map bootstrap_map; |
db276fa1 | 161 | hp_timing_t start_time; |
264ec183 | 162 | size_t cnt; |
d66e34cd | 163 | |
b1dbbaa4 RM |
164 | /* This #define produces dynamic linking inline functions for |
165 | bootstrap relocation instead of general-purpose relocation. */ | |
166 | #define RTLD_BOOTSTRAP | |
c0282c06 UD |
167 | #define RESOLVE_MAP(sym, version, flags) \ |
168 | ((*(sym))->st_shndx == SHN_UNDEF ? 0 : &bootstrap_map) | |
50463d27 UD |
169 | #define RESOLVE(sym, version, flags) \ |
170 | ((*(sym))->st_shndx == SHN_UNDEF ? 0 : bootstrap_map.l_addr) | |
b1dbbaa4 RM |
171 | #include "dynamic-link.h" |
172 | ||
db276fa1 UD |
173 | if (HP_TIMING_INLINE && HP_TIMING_AVAIL) |
174 | HP_TIMING_NOW (start_time); | |
175 | ||
264ec183 UD |
176 | /* Partly clean the `bootstrap_map' structure up. Don't use `memset' |
177 | since it might nor be built in or inlined and we cannot make function | |
178 | calls at this point. */ | |
179 | for (cnt = 0; | |
180 | cnt < sizeof (bootstrap_map.l_info) / sizeof (bootstrap_map.l_info[0]); | |
181 | ++cnt) | |
182 | bootstrap_map.l_info[cnt] = 0; | |
183 | ||
d66e34cd | 184 | /* Figure out the run-time load address of the dynamic linker itself. */ |
86d2c878 | 185 | bootstrap_map.l_addr = elf_machine_load_address (); |
d66e34cd | 186 | |
47707456 UD |
187 | /* Read our own dynamic section and fill in the info array. */ |
188 | bootstrap_map.l_ld = (void *) bootstrap_map.l_addr + elf_machine_dynamic (); | |
d3ac2d47 | 189 | elf_get_dynamic_info (&bootstrap_map); |
d66e34cd RM |
190 | |
191 | #ifdef ELF_MACHINE_BEFORE_RTLD_RELOC | |
86d2c878 | 192 | ELF_MACHINE_BEFORE_RTLD_RELOC (bootstrap_map.l_info); |
d66e34cd RM |
193 | #endif |
194 | ||
195 | /* Relocate ourselves so we can do normal function calls and | |
196 | data access using the global offset table. */ | |
421f82e5 | 197 | |
3996f34b | 198 | ELF_DYNAMIC_RELOCATE (&bootstrap_map, 0, 0); |
ea7eb7e3 UD |
199 | /* Please note that we don't allow profiling of this object and |
200 | therefore need not test whether we have to allocate the array | |
201 | for the relocation results (as done in dl-reloc.c). */ | |
421f82e5 | 202 | |
d66e34cd RM |
203 | /* Now life is sane; we can call functions and access global data. |
204 | Set up to use the operating system facilities, and find out from | |
205 | the operating system's program loader where to find the program | |
6a1db4ff UD |
206 | header table in core. Put the rest of _dl_start into a separate |
207 | function, that way the compiler cannot put accesses to the GOT | |
208 | before ELF_DYNAMIC_RELOCATE. */ | |
c0282c06 UD |
209 | { |
210 | ElfW(Addr) entry = _dl_start_final (arg, &bootstrap_map, start_time); | |
211 | ||
212 | #ifndef ELF_MACHINE_START_ADDRESS | |
213 | # define ELF_MACHINE_START_ADDRESS(map, start) (start) | |
214 | #endif | |
215 | ||
216 | return ELF_MACHINE_START_ADDRESS (_dl_loaded, entry); | |
217 | } | |
6a1db4ff UD |
218 | } |
219 | ||
220 | ||
221 | static ElfW(Addr) | |
222 | _dl_start_final (void *arg, struct link_map *bootstrap_map_p, | |
223 | hp_timing_t start_time) | |
224 | { | |
225 | /* The use of `alloca' here looks ridiculous but it helps. The goal | |
226 | is to avoid the function from being inlined. There is no official | |
227 | way to do this so we use this trick. gcc never inlines functions | |
228 | which use `alloca'. */ | |
229 | ElfW(Addr) *start_addr = alloca (sizeof (ElfW(Addr))); | |
d66e34cd | 230 | |
db276fa1 UD |
231 | if (HP_TIMING_AVAIL) |
232 | { | |
233 | /* If it hasn't happen yet record the startup time. */ | |
234 | if (! HP_TIMING_INLINE) | |
235 | HP_TIMING_NOW (start_time); | |
236 | ||
237 | /* Initialize the timing functions. */ | |
238 | HP_TIMING_DIFF_INIT (); | |
239 | } | |
240 | ||
86d2c878 | 241 | /* Transfer data about ourselves to the permanent link_map structure. */ |
6a1db4ff UD |
242 | _dl_rtld_map.l_addr = bootstrap_map_p->l_addr; |
243 | _dl_rtld_map.l_ld = bootstrap_map_p->l_ld; | |
f41c8091 | 244 | _dl_rtld_map.l_opencount = 1; |
6a1db4ff | 245 | memcpy (_dl_rtld_map.l_info, bootstrap_map_p->l_info, |
ee188d55 RM |
246 | sizeof _dl_rtld_map.l_info); |
247 | _dl_setup_hash (&_dl_rtld_map); | |
86d2c878 | 248 | |
052b6a6c UD |
249 | /* Don't bother trying to work out how ld.so is mapped in memory. */ |
250 | _dl_rtld_map.l_map_start = ~0; | |
251 | _dl_rtld_map.l_map_end = ~0; | |
252 | ||
d66e34cd RM |
253 | /* Call the OS-dependent function to set up life so we can do things like |
254 | file access. It will call `dl_main' (below) to do all the real work | |
255 | of the dynamic linker, and then unwind our frame and run the user | |
256 | entry point on the same stack we entered on. */ | |
6a1db4ff | 257 | *start_addr = _dl_sysdep_start (arg, &dl_main); |
8b07d6a8 | 258 | #ifndef HP_TIMING_NONAVAIL |
db276fa1 UD |
259 | if (HP_TIMING_AVAIL) |
260 | { | |
261 | hp_timing_t end_time; | |
262 | ||
263 | /* Get the current time. */ | |
264 | HP_TIMING_NOW (end_time); | |
265 | ||
266 | /* Compute the difference. */ | |
267 | HP_TIMING_DIFF (rtld_total_time, start_time, end_time); | |
268 | } | |
8b07d6a8 | 269 | #endif |
db276fa1 | 270 | |
466a0ec9 | 271 | if (__builtin_expect (_dl_debug_statistics, 0)) |
db276fa1 UD |
272 | print_statistics (); |
273 | ||
6a1db4ff | 274 | return *start_addr; |
d66e34cd RM |
275 | } |
276 | ||
d66e34cd RM |
277 | /* Now life is peachy; we can do all normal operations. |
278 | On to the real work. */ | |
279 | ||
f21acc89 | 280 | void ENTRY_POINT (void); |
d66e34cd | 281 | |
993b3242 UD |
282 | /* Some helper functions. */ |
283 | ||
284 | /* Arguments to relocate_doit. */ | |
285 | struct relocate_args | |
286 | { | |
287 | struct link_map *l; | |
288 | int lazy; | |
289 | }; | |
290 | ||
291 | struct map_args | |
292 | { | |
293 | /* Argument to map_doit. */ | |
294 | char *str; | |
295 | /* Return value of map_doit. */ | |
296 | struct link_map *main_map; | |
297 | }; | |
298 | ||
299 | /* Arguments to version_check_doit. */ | |
300 | struct version_check_args | |
301 | { | |
993b3242 | 302 | int doexit; |
145b8413 | 303 | int dotrace; |
993b3242 UD |
304 | }; |
305 | ||
306 | static void | |
307 | relocate_doit (void *a) | |
308 | { | |
309 | struct relocate_args *args = (struct relocate_args *) a; | |
310 | ||
be935610 | 311 | _dl_relocate_object (args->l, args->l->l_scope, |
c0fb8a56 | 312 | args->lazy, 0); |
993b3242 UD |
313 | } |
314 | ||
315 | static void | |
316 | map_doit (void *a) | |
317 | { | |
be935610 | 318 | struct map_args *args = (struct map_args *) a; |
c6222ab9 | 319 | args->main_map = _dl_map_object (NULL, args->str, 0, lt_library, 0); |
993b3242 UD |
320 | } |
321 | ||
322 | static void | |
323 | version_check_doit (void *a) | |
324 | { | |
be935610 | 325 | struct version_check_args *args = (struct version_check_args *) a; |
145b8413 | 326 | if (_dl_check_all_versions (_dl_loaded, 1, args->dotrace) && args->doexit) |
993b3242 UD |
327 | /* We cannot start the application. Abort now. */ |
328 | _exit (1); | |
329 | } | |
330 | ||
ce37fa88 UD |
331 | |
332 | static inline struct link_map * | |
333 | find_needed (const char *name) | |
334 | { | |
be935610 | 335 | unsigned int n = _dl_loaded->l_searchlist.r_nlist; |
ce37fa88 | 336 | |
be935610 UD |
337 | while (n-- > 0) |
338 | if (_dl_name_match_p (name, _dl_loaded->l_searchlist.r_list[n])) | |
339 | return _dl_loaded->l_searchlist.r_list[n]; | |
ce37fa88 UD |
340 | |
341 | /* Should never happen. */ | |
342 | return NULL; | |
343 | } | |
344 | ||
345 | static int | |
346 | match_version (const char *string, struct link_map *map) | |
347 | { | |
a42195db | 348 | const char *strtab = (const void *) D_PTR (map, l_info[DT_STRTAB]); |
ce37fa88 UD |
349 | ElfW(Verdef) *def; |
350 | ||
b0982c4a | 351 | #define VERDEFTAG (DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGIDX (DT_VERDEF)) |
ce37fa88 UD |
352 | if (map->l_info[VERDEFTAG] == NULL) |
353 | /* The file has no symbol versioning. */ | |
354 | return 0; | |
355 | ||
356 | def = (ElfW(Verdef) *) ((char *) map->l_addr | |
357 | + map->l_info[VERDEFTAG]->d_un.d_ptr); | |
358 | while (1) | |
359 | { | |
360 | ElfW(Verdaux) *aux = (ElfW(Verdaux) *) ((char *) def + def->vd_aux); | |
361 | ||
362 | /* Compare the version strings. */ | |
363 | if (strcmp (string, strtab + aux->vda_name) == 0) | |
364 | /* Bingo! */ | |
365 | return 1; | |
366 | ||
367 | /* If no more definitions we failed to find what we want. */ | |
368 | if (def->vd_next == 0) | |
369 | break; | |
370 | ||
371 | /* Next definition. */ | |
372 | def = (ElfW(Verdef) *) ((char *) def + def->vd_next); | |
373 | } | |
374 | ||
375 | return 0; | |
376 | } | |
377 | ||
120b4c49 UD |
378 | static const char *library_path; /* The library search path. */ |
379 | static const char *preloadlist; /* The list preloaded objects. */ | |
380 | static int version_info; /* Nonzero if information about | |
381 | versions has to be printed. */ | |
a1a9d215 | 382 | |
d66e34cd | 383 | static void |
266180eb RM |
384 | dl_main (const ElfW(Phdr) *phdr, |
385 | ElfW(Half) phent, | |
386 | ElfW(Addr) *user_entry) | |
d66e34cd | 387 | { |
266180eb | 388 | const ElfW(Phdr) *ph; |
ea278354 | 389 | enum mode mode; |
2064087b RM |
390 | struct link_map **preloads; |
391 | unsigned int npreloads; | |
14bab8de UD |
392 | size_t file_size; |
393 | char *file; | |
2f6d1f1b | 394 | int has_interp = 0; |
77aba05b | 395 | unsigned int i; |
9a51759b | 396 | int rtld_is_main = 0; |
5732c4df | 397 | #ifndef HP_TIMING_NONAVAIL |
db276fa1 UD |
398 | hp_timing_t start; |
399 | hp_timing_t stop; | |
400 | hp_timing_t diff; | |
5732c4df | 401 | #endif |
d66e34cd | 402 | |
db33f7d4 UD |
403 | /* First thing, if this is a SUID program we make sure that FDs 0, |
404 | 1, and 2 are allocated. If necessary we are doing it ourself. | |
405 | If it is not possible we stop the program. */ | |
406 | if (__builtin_expect (__libc_enable_secure, 0)) | |
407 | __libc_check_standard_fds (); | |
408 | ||
ea278354 | 409 | /* Process the environment variable which control the behaviour. */ |
12b5b6b7 | 410 | process_envvars (&mode, &_dl_lazy); |
3996f34b | 411 | |
46ec036d UD |
412 | /* Set up a flag which tells we are just starting. */ |
413 | _dl_starting_up = 1; | |
414 | ||
f21acc89 | 415 | if (*user_entry == (ElfW(Addr)) &ENTRY_POINT) |
0200214b RM |
416 | { |
417 | /* Ho ho. We are not the program interpreter! We are the program | |
418 | itself! This means someone ran ld.so as a command. Well, that | |
419 | might be convenient to do sometimes. We support it by | |
420 | interpreting the args like this: | |
421 | ||
422 | ld.so PROGRAM ARGS... | |
423 | ||
424 | The first argument is the name of a file containing an ELF | |
425 | executable we will load and run with the following arguments. | |
426 | To simplify life here, PROGRAM is searched for using the | |
427 | normal rules for shared objects, rather than $PATH or anything | |
428 | like that. We just load it and use its entry point; we don't | |
429 | pay attention to its PT_INTERP command (we are the interpreter | |
430 | ourselves). This is an easy way to test a new ld.so before | |
431 | installing it. */ | |
9a51759b | 432 | rtld_is_main = 1; |
421f82e5 | 433 | |
ffee1316 RM |
434 | /* Note the place where the dynamic linker actually came from. */ |
435 | _dl_rtld_map.l_name = _dl_argv[0]; | |
6a76c115 | 436 | |
fd26970f UD |
437 | while (_dl_argc > 1) |
438 | if (! strcmp (_dl_argv[1], "--list")) | |
439 | { | |
440 | mode = list; | |
12b5b6b7 | 441 | _dl_lazy = -1; /* This means do no dependency analysis. */ |
61965e9b | 442 | |
fd26970f UD |
443 | ++_dl_skip_args; |
444 | --_dl_argc; | |
445 | ++_dl_argv; | |
446 | } | |
447 | else if (! strcmp (_dl_argv[1], "--verify")) | |
448 | { | |
449 | mode = verify; | |
6a76c115 | 450 | |
fd26970f UD |
451 | ++_dl_skip_args; |
452 | --_dl_argc; | |
453 | ++_dl_argv; | |
454 | } | |
310930c1 | 455 | else if (! strcmp (_dl_argv[1], "--library-path") && _dl_argc > 2) |
880f421f UD |
456 | { |
457 | library_path = _dl_argv[2]; | |
458 | ||
310930c1 UD |
459 | _dl_skip_args += 2; |
460 | _dl_argc -= 2; | |
461 | _dl_argv += 2; | |
462 | } | |
b0a01055 | 463 | else if (! strcmp (_dl_argv[1], "--inhibit-rpath") && _dl_argc > 2) |
310930c1 | 464 | { |
b0a01055 | 465 | _dl_inhibit_rpath = _dl_argv[2]; |
310930c1 | 466 | |
880f421f UD |
467 | _dl_skip_args += 2; |
468 | _dl_argc -= 2; | |
469 | _dl_argv += 2; | |
470 | } | |
fd26970f UD |
471 | else |
472 | break; | |
d66e34cd | 473 | |
61eb22d3 UD |
474 | /* If we have no further argument the program was called incorrectly. |
475 | Grant the user some education. */ | |
476 | if (_dl_argc < 2) | |
477 | _dl_sysdep_fatal ("\ | |
2bcf29ba | 478 | Usage: ld.so [OPTION]... EXECUTABLE-FILE [ARGS-FOR-PROGRAM...]\n\ |
61eb22d3 UD |
479 | You have invoked `ld.so', the helper program for shared library executables.\n\ |
480 | This program usually lives in the file `/lib/ld.so', and special directives\n\ | |
481 | in executable files using ELF shared libraries tell the system's program\n\ | |
482 | loader to load the helper program from this file. This helper program loads\n\ | |
483 | the shared libraries needed by the program executable, prepares the program\n\ | |
484 | to run, and runs it. You may invoke this helper program directly from the\n\ | |
485 | command line to load and run an ELF executable file; this is like executing\n\ | |
486 | that file itself, but always uses this helper program from the file you\n\ | |
487 | specified, instead of the helper program file specified in the executable\n\ | |
488 | file you run. This is mostly of use for maintainers to test new versions\n\ | |
2bcf29ba UD |
489 | of this helper program; chances are you did not intend to run this program.\n\ |
490 | \n\ | |
b0a01055 UD |
491 | --list list all dependencies and how they are resolved\n\ |
492 | --verify verify that given object really is a dynamically linked\n\ | |
e8b1163e | 493 | object we can handle\n\ |
b0a01055 UD |
494 | --library-path PATH use given PATH instead of content of the environment\n\ |
495 | variable LD_LIBRARY_PATH\n\ | |
fcf70d41 UD |
496 | --inhibit-rpath LIST ignore RUNPATH and RPATH information in object names\n\ |
497 | in LIST\n", | |
61eb22d3 UD |
498 | NULL); |
499 | ||
0200214b RM |
500 | ++_dl_skip_args; |
501 | --_dl_argc; | |
502 | ++_dl_argv; | |
91f62ce6 | 503 | |
da832465 UD |
504 | /* Initialize the data structures for the search paths for shared |
505 | objects. */ | |
506 | _dl_init_paths (library_path); | |
507 | ||
9a821cf9 | 508 | if (__builtin_expect (mode, normal) == verify) |
2de99474 | 509 | { |
dcf0671d | 510 | char *err_str = NULL; |
993b3242 | 511 | struct map_args args; |
2de99474 | 512 | |
993b3242 | 513 | args.str = _dl_argv[0]; |
8d9618b7 | 514 | (void) _dl_catch_error (&err_str, map_doit, &args); |
2de99474 | 515 | if (err_str != NULL) |
dcf0671d UD |
516 | { |
517 | free (err_str); | |
518 | _exit (EXIT_FAILURE); | |
519 | } | |
2de99474 UD |
520 | } |
521 | else | |
db276fa1 UD |
522 | { |
523 | HP_TIMING_NOW (start); | |
524 | _dl_map_object (NULL, _dl_argv[0], 0, lt_library, 0); | |
525 | HP_TIMING_NOW (stop); | |
61e0617a | 526 | |
db276fa1 UD |
527 | HP_TIMING_DIFF (load_time, start, stop); |
528 | } | |
2de99474 | 529 | |
be935610 UD |
530 | phdr = _dl_loaded->l_phdr; |
531 | phent = _dl_loaded->l_phnum; | |
143e2b96 UD |
532 | /* We overwrite here a pointer to a malloc()ed string. But since |
533 | the malloc() implementation used at this point is the dummy | |
534 | implementations which has no real free() function it does not | |
535 | makes sense to free the old string first. */ | |
be935610 UD |
536 | _dl_loaded->l_name = (char *) ""; |
537 | *user_entry = _dl_loaded->l_entry; | |
0200214b RM |
538 | } |
539 | else | |
540 | { | |
541 | /* Create a link_map for the executable itself. | |
542 | This will be what dlopen on "" returns. */ | |
87c812c2 | 543 | _dl_new_object ((char *) "", "", lt_executable, NULL); |
be935610 | 544 | if (_dl_loaded == NULL) |
762a2918 | 545 | _dl_sysdep_fatal ("cannot allocate memory for link map\n", NULL); |
be935610 UD |
546 | _dl_loaded->l_phdr = phdr; |
547 | _dl_loaded->l_phnum = phent; | |
548 | _dl_loaded->l_entry = *user_entry; | |
549 | _dl_loaded->l_opencount = 1; | |
da832465 | 550 | |
61e0617a UD |
551 | /* At this point we are in a bit of trouble. We would have to |
552 | fill in the values for l_dev and l_ino. But in general we | |
553 | do not know where the file is. We also do not handle AT_EXECFD | |
554 | even if it would be passed up. | |
555 | ||
556 | We leave the values here defined to 0. This is normally no | |
557 | problem as the program code itself is normally no shared | |
558 | object and therefore cannot be loaded dynamically. Nothing | |
559 | prevent the use of dynamic binaries and in these situations | |
560 | we might get problems. We might not be able to find out | |
561 | whether the object is already loaded. But since there is no | |
562 | easy way out and because the dynamic binary must also not | |
563 | have an SONAME we ignore this program for now. If it becomes | |
564 | a problem we can force people using SONAMEs. */ | |
565 | ||
97a51d8a UD |
566 | /* We delay initializing the path structure until we got the dynamic |
567 | information for the program. */ | |
0200214b RM |
568 | } |
569 | ||
052b6a6c | 570 | /* It is not safe to load stuff after the main program. */ |
be935610 | 571 | _dl_loaded->l_map_end = ~0; |
052b6a6c | 572 | /* Perhaps the executable has no PT_LOAD header entries at all. */ |
be935610 | 573 | _dl_loaded->l_map_start = ~0; |
052b6a6c | 574 | |
0200214b RM |
575 | /* Scan the program header table for the dynamic section. */ |
576 | for (ph = phdr; ph < &phdr[phent]; ++ph) | |
577 | switch (ph->p_type) | |
578 | { | |
da832465 UD |
579 | case PT_PHDR: |
580 | /* Find out the load address. */ | |
be935610 | 581 | _dl_loaded->l_addr = (ElfW(Addr)) phdr - ph->p_vaddr; |
da832465 | 582 | break; |
0200214b RM |
583 | case PT_DYNAMIC: |
584 | /* This tells us where to find the dynamic section, | |
585 | which tells us everything we need to do. */ | |
be935610 | 586 | _dl_loaded->l_ld = (void *) _dl_loaded->l_addr + ph->p_vaddr; |
0200214b RM |
587 | break; |
588 | case PT_INTERP: | |
589 | /* This "interpreter segment" was used by the program loader to | |
590 | find the program interpreter, which is this program itself, the | |
591 | dynamic linker. We note what name finds us, so that a future | |
592 | dlopen call or DT_NEEDED entry, for something that wants to link | |
593 | against the dynamic linker as a shared library, will know that | |
594 | the shared object is already loaded. */ | |
be935610 UD |
595 | _dl_rtld_libname.name = ((const char *) _dl_loaded->l_addr |
596 | + ph->p_vaddr); | |
c84142e8 UD |
597 | _dl_rtld_libname.next = NULL; |
598 | _dl_rtld_map.l_libname = &_dl_rtld_libname; | |
f41c8091 UD |
599 | |
600 | /* Ordinarilly, we would get additional names for the loader from | |
601 | our DT_SONAME. This can't happen if we were actually linked as | |
602 | a static executable (detect this case when we have no DYNAMIC). | |
603 | If so, assume the filename component of the interpreter path to | |
604 | be our SONAME, and add it to our name list. */ | |
605 | if (_dl_rtld_map.l_ld == NULL) | |
606 | { | |
607 | char *p = strrchr (_dl_rtld_libname.name, '/'); | |
608 | if (p) | |
609 | { | |
610 | _dl_rtld_libname2.name = p+1; | |
611 | _dl_rtld_libname2.next = NULL; | |
612 | _dl_rtld_libname.next = &_dl_rtld_libname2; | |
613 | } | |
614 | } | |
615 | ||
2f6d1f1b | 616 | has_interp = 1; |
0200214b | 617 | break; |
052b6a6c UD |
618 | case PT_LOAD: |
619 | /* Remember where the main program starts in memory. */ | |
620 | { | |
621 | ElfW(Addr) mapstart; | |
be935610 UD |
622 | mapstart = _dl_loaded->l_addr + (ph->p_vaddr & ~(ph->p_align - 1)); |
623 | if (_dl_loaded->l_map_start > mapstart) | |
624 | _dl_loaded->l_map_start = mapstart; | |
052b6a6c UD |
625 | } |
626 | break; | |
0200214b | 627 | } |
ffee1316 | 628 | if (! _dl_rtld_map.l_libname && _dl_rtld_map.l_name) |
c84142e8 UD |
629 | { |
630 | /* We were invoked directly, so the program might not have a | |
631 | PT_INTERP. */ | |
632 | _dl_rtld_libname.name = _dl_rtld_map.l_name; | |
633 | _dl_rtld_libname.next = NULL; | |
634 | _dl_rtld_map.l_libname = &_dl_rtld_libname; | |
635 | } | |
ffee1316 RM |
636 | else |
637 | assert (_dl_rtld_map.l_libname); /* How else did we get here? */ | |
0200214b | 638 | |
9a51759b UD |
639 | if (! rtld_is_main) |
640 | { | |
641 | /* Extract the contents of the dynamic section for easy access. */ | |
d3ac2d47 | 642 | elf_get_dynamic_info (_dl_loaded); |
9a51759b UD |
643 | if (_dl_loaded->l_info[DT_HASH]) |
644 | /* Set up our cache of pointers into the hash table. */ | |
645 | _dl_setup_hash (_dl_loaded); | |
646 | } | |
0200214b | 647 | |
9a821cf9 | 648 | if (__builtin_expect (mode, normal) == verify) |
e2102c14 UD |
649 | { |
650 | /* We were called just to verify that this is a dynamic | |
651 | executable using us as the program interpreter. Exit with an | |
652 | error if we were not able to load the binary or no interpreter | |
653 | is specified (i.e., this is no dynamically linked binary. */ | |
be935610 | 654 | if (_dl_loaded->l_ld == NULL) |
e2102c14 | 655 | _exit (1); |
e2102c14 UD |
656 | |
657 | /* We allow here some platform specific code. */ | |
658 | #ifdef DISTINGUISH_LIB_VERSIONS | |
659 | DISTINGUISH_LIB_VERSIONS; | |
660 | #endif | |
eb406346 | 661 | _exit (has_interp ? 0 : 2); |
e2102c14 UD |
662 | } |
663 | ||
9a51759b | 664 | if (! rtld_is_main) |
97a51d8a UD |
665 | /* Initialize the data structures for the search paths for shared |
666 | objects. */ | |
120b4c49 | 667 | _dl_init_paths (library_path); |
97a51d8a | 668 | |
0200214b | 669 | /* Put the link_map for ourselves on the chain so it can be found by |
ceb2d9aa | 670 | name. Note that at this point the global chain of link maps contains |
be935610 | 671 | exactly one element, which is pointed to by _dl_loaded. */ |
ffee1316 RM |
672 | if (! _dl_rtld_map.l_name) |
673 | /* If not invoked directly, the dynamic linker shared object file was | |
674 | found by the PT_INTERP name. */ | |
c84142e8 | 675 | _dl_rtld_map.l_name = (char *) _dl_rtld_map.l_libname->name; |
ba79d61b | 676 | _dl_rtld_map.l_type = lt_library; |
be935610 UD |
677 | _dl_loaded->l_next = &_dl_rtld_map; |
678 | _dl_rtld_map.l_prev = _dl_loaded; | |
0200214b | 679 | |
14bab8de | 680 | /* We have two ways to specify objects to preload: via environment |
49c091e5 | 681 | variable and via the file /etc/ld.so.preload. The latter can also |
14bab8de | 682 | be used when security is enabled. */ |
2064087b RM |
683 | preloads = NULL; |
684 | npreloads = 0; | |
14bab8de | 685 | |
db33f7d4 | 686 | if (__builtin_expect (preloadlist != NULL, 0)) |
c4029823 | 687 | { |
566efee2 UD |
688 | /* The LD_PRELOAD environment variable gives list of libraries |
689 | separated by white space or colons that are loaded before the | |
fd26970f UD |
690 | executable's dependencies and prepended to the global scope |
691 | list. If the binary is running setuid all elements | |
692 | containing a '/' are ignored since it is insecure. */ | |
693 | char *list = strdupa (preloadlist); | |
694 | char *p; | |
db276fa1 UD |
695 | |
696 | HP_TIMING_NOW (start); | |
697 | ||
566efee2 | 698 | while ((p = strsep (&list, " :")) != NULL) |
e2102c14 | 699 | if (p[0] != '\0' |
db33f7d4 UD |
700 | && (__builtin_expect (! __libc_enable_secure, 1) |
701 | || strchr (p, '/') == NULL)) | |
fd26970f | 702 | { |
be935610 | 703 | struct link_map *new_map = _dl_map_object (_dl_loaded, p, 1, |
c6222ab9 | 704 | lt_library, 0); |
bd355af0 UD |
705 | if (new_map->l_opencount == 1) |
706 | /* It is no duplicate. */ | |
707 | ++npreloads; | |
fd26970f | 708 | } |
db276fa1 UD |
709 | |
710 | HP_TIMING_NOW (stop); | |
711 | HP_TIMING_DIFF (diff, start, stop); | |
712 | HP_TIMING_ACCUM_NT (load_time, diff); | |
c4029823 UD |
713 | } |
714 | ||
14bab8de UD |
715 | /* Read the contents of the file. */ |
716 | file = _dl_sysdep_read_whole_file ("/etc/ld.so.preload", &file_size, | |
717 | PROT_READ | PROT_WRITE); | |
db33f7d4 | 718 | if (__builtin_expect (file != NULL, 0)) |
14bab8de UD |
719 | { |
720 | /* Parse the file. It contains names of libraries to be loaded, | |
721 | separated by white spaces or `:'. It may also contain | |
722 | comments introduced by `#'. */ | |
723 | char *problem; | |
724 | char *runp; | |
725 | size_t rest; | |
726 | ||
727 | /* Eliminate comments. */ | |
728 | runp = file; | |
729 | rest = file_size; | |
730 | while (rest > 0) | |
731 | { | |
732 | char *comment = memchr (runp, '#', rest); | |
733 | if (comment == NULL) | |
734 | break; | |
735 | ||
736 | rest -= comment - runp; | |
737 | do | |
738 | *comment = ' '; | |
739 | while (--rest > 0 && *++comment != '\n'); | |
740 | } | |
741 | ||
742 | /* We have one problematic case: if we have a name at the end of | |
743 | the file without a trailing terminating characters, we cannot | |
744 | place the \0. Handle the case separately. */ | |
49891c10 UD |
745 | if (file[file_size - 1] != ' ' && file[file_size - 1] != '\t' |
746 | && file[file_size - 1] != '\n' && file[file_size - 1] != ':') | |
14bab8de UD |
747 | { |
748 | problem = &file[file_size]; | |
749 | while (problem > file && problem[-1] != ' ' && problem[-1] != '\t' | |
49891c10 | 750 | && problem[-1] != '\n' && problem[-1] != ':') |
14bab8de UD |
751 | --problem; |
752 | ||
753 | if (problem > file) | |
754 | problem[-1] = '\0'; | |
755 | } | |
756 | else | |
49891c10 UD |
757 | { |
758 | problem = NULL; | |
759 | file[file_size - 1] = '\0'; | |
760 | } | |
14bab8de | 761 | |
db276fa1 UD |
762 | HP_TIMING_NOW (start); |
763 | ||
14bab8de UD |
764 | if (file != problem) |
765 | { | |
766 | char *p; | |
e2102c14 | 767 | runp = file; |
14bab8de | 768 | while ((p = strsep (&runp, ": \t\n")) != NULL) |
e2102c14 UD |
769 | if (p[0] != '\0') |
770 | { | |
be935610 | 771 | struct link_map *new_map = _dl_map_object (_dl_loaded, p, 1, |
e2102c14 UD |
772 | lt_library, 0); |
773 | if (new_map->l_opencount == 1) | |
774 | /* It is no duplicate. */ | |
775 | ++npreloads; | |
776 | } | |
14bab8de UD |
777 | } |
778 | ||
779 | if (problem != NULL) | |
780 | { | |
781 | char *p = strndupa (problem, file_size - (problem - file)); | |
be935610 | 782 | struct link_map *new_map = _dl_map_object (_dl_loaded, p, 1, |
c6222ab9 | 783 | lt_library, 0); |
bd355af0 UD |
784 | if (new_map->l_opencount == 1) |
785 | /* It is no duplicate. */ | |
786 | ++npreloads; | |
14bab8de UD |
787 | } |
788 | ||
db276fa1 UD |
789 | HP_TIMING_NOW (stop); |
790 | HP_TIMING_DIFF (diff, start, stop); | |
791 | HP_TIMING_ACCUM_NT (load_time, diff); | |
792 | ||
14bab8de UD |
793 | /* We don't need the file anymore. */ |
794 | __munmap (file, file_size); | |
795 | } | |
796 | ||
db33f7d4 | 797 | if (__builtin_expect (npreloads, 0) != 0) |
14bab8de UD |
798 | { |
799 | /* Set up PRELOADS with a vector of the preloaded libraries. */ | |
800 | struct link_map *l; | |
14bab8de UD |
801 | preloads = __alloca (npreloads * sizeof preloads[0]); |
802 | l = _dl_rtld_map.l_next; /* End of the chain before preloads. */ | |
803 | i = 0; | |
804 | do | |
805 | { | |
806 | preloads[i++] = l; | |
807 | l = l->l_next; | |
808 | } while (l); | |
809 | assert (i == npreloads); | |
810 | } | |
811 | ||
2064087b RM |
812 | /* Load all the libraries specified by DT_NEEDED entries. If LD_PRELOAD |
813 | specified some libraries to load, these are inserted before the actual | |
814 | dependencies in the executable's searchlist for symbol resolution. */ | |
db276fa1 | 815 | HP_TIMING_NOW (start); |
d9cb1a7d | 816 | _dl_map_object_deps (_dl_loaded, preloads, npreloads, mode == trace); |
db276fa1 UD |
817 | HP_TIMING_NOW (stop); |
818 | HP_TIMING_DIFF (diff, start, stop); | |
819 | HP_TIMING_ACCUM_NT (load_time, diff); | |
e3e35cfc UD |
820 | |
821 | /* Mark all objects as being in the global scope. */ | |
822 | for (i = _dl_loaded->l_searchlist.r_nlist; i > 0; ) | |
823 | _dl_loaded->l_searchlist.r_list[--i]->l_global = 1; | |
d66e34cd | 824 | |
2064087b | 825 | #ifndef MAP_ANON |
f332db02 RM |
826 | /* We are done mapping things, so close the zero-fill descriptor. */ |
827 | __close (_dl_zerofd); | |
828 | _dl_zerofd = -1; | |
2064087b | 829 | #endif |
f332db02 | 830 | |
f9496a7b RM |
831 | /* Remove _dl_rtld_map from the chain. */ |
832 | _dl_rtld_map.l_prev->l_next = _dl_rtld_map.l_next; | |
833 | if (_dl_rtld_map.l_next) | |
834 | _dl_rtld_map.l_next->l_prev = _dl_rtld_map.l_prev; | |
835 | ||
9a821cf9 | 836 | if (__builtin_expect (_dl_rtld_map.l_opencount, 2) > 1) |
0200214b | 837 | { |
f9496a7b RM |
838 | /* Some DT_NEEDED entry referred to the interpreter object itself, so |
839 | put it back in the list of visible objects. We insert it into the | |
840 | chain in symbol search order because gdb uses the chain's order as | |
841 | its symbol search order. */ | |
77aba05b | 842 | i = 1; |
be935610 | 843 | while (_dl_loaded->l_searchlist.r_list[i] != &_dl_rtld_map) |
f9496a7b | 844 | ++i; |
be935610 | 845 | _dl_rtld_map.l_prev = _dl_loaded->l_searchlist.r_list[i - 1]; |
b2bcd61a UD |
846 | if (__builtin_expect (mode, normal) == normal) |
847 | _dl_rtld_map.l_next = (i + 1 < _dl_loaded->l_searchlist.r_nlist | |
848 | ? _dl_loaded->l_searchlist.r_list[i + 1] | |
849 | : NULL); | |
850 | else | |
851 | /* In trace mode there might be an invisible object (which we | |
852 | could not find) after the previous one in the search list. | |
853 | In this case it doesn't matter much where we put the | |
854 | interpreter object, so we just initialize the list pointer so | |
855 | that the assertion below holds. */ | |
856 | _dl_rtld_map.l_next = _dl_rtld_map.l_prev->l_next; | |
857 | ||
f9496a7b RM |
858 | assert (_dl_rtld_map.l_prev->l_next == _dl_rtld_map.l_next); |
859 | _dl_rtld_map.l_prev->l_next = &_dl_rtld_map; | |
4d02a5b1 | 860 | if (_dl_rtld_map.l_next) |
f9496a7b RM |
861 | { |
862 | assert (_dl_rtld_map.l_next->l_prev == _dl_rtld_map.l_prev); | |
863 | _dl_rtld_map.l_next->l_prev = &_dl_rtld_map; | |
864 | } | |
0200214b | 865 | } |
d66e34cd | 866 | |
c84142e8 UD |
867 | /* Now let us see whether all libraries are available in the |
868 | versions we need. */ | |
869 | { | |
993b3242 UD |
870 | struct version_check_args args; |
871 | args.doexit = mode == normal; | |
145b8413 | 872 | args.dotrace = mode == trace; |
993b3242 | 873 | _dl_receive_error (print_missing_version, version_check_doit, &args); |
c84142e8 UD |
874 | } |
875 | ||
9a821cf9 | 876 | if (__builtin_expect (mode, normal) != normal) |
0200214b RM |
877 | { |
878 | /* We were run just to list the shared libraries. It is | |
879 | important that we do this before real relocation, because the | |
880 | functions we call below for output may no longer work properly | |
881 | after relocation. */ | |
0200214b RM |
882 | if (! _dl_loaded->l_info[DT_NEEDED]) |
883 | _dl_sysdep_message ("\t", "statically linked\n", NULL); | |
884 | else | |
ceb2d9aa UD |
885 | { |
886 | struct link_map *l; | |
887 | ||
888 | for (l = _dl_loaded->l_next; l; l = l->l_next) | |
889 | if (l->l_opencount == 0) | |
890 | /* The library was not found. */ | |
891 | _dl_sysdep_message ("\t", l->l_libname->name, " => not found\n", | |
892 | NULL); | |
893 | else | |
894 | { | |
895 | char buf[20], *bp; | |
896 | buf[sizeof buf - 1] = '\0'; | |
af6f3906 | 897 | bp = _itoa_word (l->l_addr, &buf[sizeof buf - 1], 16, 0); |
ceb2d9aa UD |
898 | while ((size_t) (&buf[sizeof buf - 1] - bp) |
899 | < sizeof l->l_addr * 2) | |
900 | *--bp = '0'; | |
901 | _dl_sysdep_message ("\t", l->l_libname->name, " => ", | |
902 | l->l_name, " (0x", bp, ")\n", NULL); | |
903 | } | |
904 | } | |
1a3a58fd | 905 | |
9a821cf9 | 906 | if (__builtin_expect (mode, trace) != trace) |
cddcfecf RM |
907 | for (i = 1; i < _dl_argc; ++i) |
908 | { | |
909 | const ElfW(Sym) *ref = NULL; | |
c0282c06 UD |
910 | ElfW(Addr) loadbase; |
911 | lookup_t result; | |
cddcfecf | 912 | char buf[20], *bp; |
c0282c06 UD |
913 | |
914 | result = _dl_lookup_symbol (_dl_argv[i], _dl_loaded, | |
915 | &ref, _dl_loaded->l_scope, | |
916 | ELF_MACHINE_JMP_SLOT); | |
917 | ||
918 | loadbase = LOOKUP_VALUE_ADDRESS (result); | |
919 | ||
cddcfecf | 920 | buf[sizeof buf - 1] = '\0'; |
af6f3906 | 921 | bp = _itoa_word (ref->st_value, &buf[sizeof buf - 1], 16, 0); |
14bab8de | 922 | while ((size_t) (&buf[sizeof buf - 1] - bp) < sizeof loadbase * 2) |
cddcfecf RM |
923 | *--bp = '0'; |
924 | _dl_sysdep_message (_dl_argv[i], " found at 0x", bp, NULL); | |
925 | buf[sizeof buf - 1] = '\0'; | |
af6f3906 | 926 | bp = _itoa_word (loadbase, &buf[sizeof buf - 1], 16, 0); |
14bab8de | 927 | while ((size_t) (&buf[sizeof buf - 1] - bp) < sizeof loadbase * 2) |
cddcfecf RM |
928 | *--bp = '0'; |
929 | _dl_sysdep_message (" in object at 0x", bp, "\n", NULL); | |
930 | } | |
ce37fa88 | 931 | else |
fd26970f | 932 | { |
12b5b6b7 | 933 | if (_dl_lazy >= 0) |
ce37fa88 UD |
934 | { |
935 | /* We have to do symbol dependency testing. */ | |
936 | struct relocate_args args; | |
937 | struct link_map *l; | |
993b3242 | 938 | |
12b5b6b7 | 939 | args.lazy = _dl_lazy; |
fd26970f | 940 | |
ce37fa88 UD |
941 | l = _dl_loaded; |
942 | while (l->l_next) | |
943 | l = l->l_next; | |
944 | do | |
945 | { | |
946 | if (l != &_dl_rtld_map && l->l_opencount > 0) | |
947 | { | |
948 | args.l = l; | |
949 | _dl_receive_error (print_unresolved, relocate_doit, | |
950 | &args); | |
ce37fa88 UD |
951 | } |
952 | l = l->l_prev; | |
953 | } while (l); | |
954 | } | |
955 | ||
b0982c4a | 956 | #define VERNEEDTAG (DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGIDX (DT_VERNEED)) |
120b4c49 | 957 | if (version_info) |
fd26970f | 958 | { |
ce37fa88 UD |
959 | /* Print more information. This means here, print information |
960 | about the versions needed. */ | |
961 | int first = 1; | |
962 | struct link_map *map = _dl_loaded; | |
963 | ||
964 | for (map = _dl_loaded; map != NULL; map = map->l_next) | |
fd26970f | 965 | { |
f41c8091 | 966 | const char *strtab; |
ce37fa88 | 967 | ElfW(Dyn) *dyn = map->l_info[VERNEEDTAG]; |
f41c8091 UD |
968 | ElfW(Verneed) *ent; |
969 | ||
970 | if (dyn == NULL) | |
971 | continue; | |
972 | ||
a42195db | 973 | strtab = (const void *) D_PTR (map, l_info[DT_STRTAB]); |
f41c8091 | 974 | ent = (ElfW(Verneed) *) (map->l_addr + dyn->d_un.d_ptr); |
ce37fa88 | 975 | |
f41c8091 | 976 | if (first) |
ce37fa88 | 977 | { |
f41c8091 UD |
978 | _dl_sysdep_message ("\n\tVersion information:\n", NULL); |
979 | first = 0; | |
980 | } | |
ce37fa88 | 981 | |
f41c8091 UD |
982 | _dl_sysdep_message ("\t", (map->l_name[0] |
983 | ? map->l_name : _dl_argv[0]), | |
984 | ":\n", NULL); | |
985 | ||
986 | while (1) | |
987 | { | |
988 | ElfW(Vernaux) *aux; | |
989 | struct link_map *needed; | |
ce37fa88 | 990 | |
f41c8091 UD |
991 | needed = find_needed (strtab + ent->vn_file); |
992 | aux = (ElfW(Vernaux) *) ((char *) ent + ent->vn_aux); | |
ce37fa88 UD |
993 | |
994 | while (1) | |
995 | { | |
f41c8091 UD |
996 | const char *fname = NULL; |
997 | ||
998 | _dl_sysdep_message ("\t\t", | |
999 | strtab + ent->vn_file, | |
1000 | " (", strtab + aux->vna_name, | |
1001 | ") ", | |
1002 | (aux->vna_flags | |
1003 | & VER_FLG_WEAK | |
1004 | ? "[WEAK] " : ""), | |
1005 | "=> ", NULL); | |
1006 | ||
1007 | if (needed != NULL | |
1008 | && match_version (strtab+aux->vna_name, needed)) | |
1009 | fname = needed->l_name; | |
1010 | ||
1011 | _dl_sysdep_message (fname ?: "not found", "\n", | |
1012 | NULL); | |
ce37fa88 | 1013 | |
f41c8091 UD |
1014 | if (aux->vna_next == 0) |
1015 | /* No more symbols. */ | |
ce37fa88 UD |
1016 | break; |
1017 | ||
f41c8091 UD |
1018 | /* Next symbol. */ |
1019 | aux = (ElfW(Vernaux) *) ((char *) aux | |
1020 | + aux->vna_next); | |
ce37fa88 | 1021 | } |
f41c8091 UD |
1022 | |
1023 | if (ent->vn_next == 0) | |
1024 | /* No more dependencies. */ | |
1025 | break; | |
1026 | ||
1027 | /* Next dependency. */ | |
1028 | ent = (ElfW(Verneed) *) ((char *) ent + ent->vn_next); | |
ce37fa88 | 1029 | } |
fd26970f | 1030 | } |
ce37fa88 | 1031 | } |
fd26970f | 1032 | } |
d66e34cd | 1033 | |
0200214b RM |
1034 | _exit (0); |
1035 | } | |
86d2c878 | 1036 | |
ba79d61b RM |
1037 | { |
1038 | /* Now we have all the objects loaded. Relocate them all except for | |
1039 | the dynamic linker itself. We do this in reverse order so that copy | |
1040 | relocs of earlier objects overwrite the data written by later | |
1041 | objects. We do not re-relocate the dynamic linker itself in this | |
1042 | loop because that could result in the GOT entries for functions we | |
1043 | call being changed, and that would break us. It is safe to relocate | |
1044 | the dynamic linker out of order because it has no copy relocs (we | |
1045 | know that because it is self-contained). */ | |
1046 | ||
ceb2d9aa | 1047 | struct link_map *l; |
c0fb8a56 | 1048 | int consider_profiling = _dl_profile != NULL; |
8b07d6a8 | 1049 | #ifndef HP_TIMING_NONAVAIL |
db276fa1 UD |
1050 | hp_timing_t start; |
1051 | hp_timing_t stop; | |
1052 | hp_timing_t add; | |
8b07d6a8 | 1053 | #endif |
c0fb8a56 UD |
1054 | |
1055 | /* If we are profiling we also must do lazy reloaction. */ | |
12b5b6b7 | 1056 | _dl_lazy |= consider_profiling; |
c0fb8a56 | 1057 | |
ba79d61b RM |
1058 | l = _dl_loaded; |
1059 | while (l->l_next) | |
1060 | l = l->l_next; | |
db276fa1 UD |
1061 | |
1062 | HP_TIMING_NOW (start); | |
ba79d61b RM |
1063 | do |
1064 | { | |
1065 | if (l != &_dl_rtld_map) | |
12b5b6b7 | 1066 | _dl_relocate_object (l, l->l_scope, _dl_lazy, consider_profiling); |
be935610 | 1067 | |
ba79d61b | 1068 | l = l->l_prev; |
db276fa1 UD |
1069 | } |
1070 | while (l); | |
1071 | HP_TIMING_NOW (stop); | |
1072 | ||
1073 | HP_TIMING_DIFF (relocate_time, start, stop); | |
ba79d61b RM |
1074 | |
1075 | /* Do any necessary cleanups for the startup OS interface code. | |
1076 | We do these now so that no calls are made after rtld re-relocation | |
1077 | which might be resolved to different functions than we expect. | |
1078 | We cannot do this before relocating the other objects because | |
1079 | _dl_relocate_object might need to call `mprotect' for DT_TEXTREL. */ | |
1080 | _dl_sysdep_start_cleanup (); | |
1081 | ||
722c33bb UD |
1082 | /* Now enable profiling if needed. Like the previous call, |
1083 | this has to go here because the calls it makes should use the | |
1084 | rtld versions of the functions (particularly calloc()), but it | |
1085 | needs to have _dl_profile_map set up by the relocator. */ | |
db33f7d4 | 1086 | if (__builtin_expect (_dl_profile_map != NULL, 0)) |
722c33bb UD |
1087 | /* We must prepare the profiling. */ |
1088 | _dl_start_profile (_dl_profile_map, _dl_profile_output); | |
1089 | ||
1ca7cbcb | 1090 | if (_dl_rtld_map.l_opencount > 1) |
db276fa1 UD |
1091 | { |
1092 | /* There was an explicit ref to the dynamic linker as a shared lib. | |
1093 | Re-relocate ourselves with user-controlled symbol definitions. */ | |
1094 | HP_TIMING_NOW (start); | |
1095 | _dl_relocate_object (&_dl_rtld_map, _dl_loaded->l_scope, 0, 0); | |
1096 | HP_TIMING_NOW (stop); | |
1097 | HP_TIMING_DIFF (add, start, stop); | |
1098 | HP_TIMING_ACCUM_NT (relocate_time, add); | |
1099 | } | |
ba79d61b | 1100 | } |
ac16e905 | 1101 | |
be935610 UD |
1102 | /* Now set up the variable which helps the assembler startup code. */ |
1103 | _dl_main_searchlist = &_dl_loaded->l_searchlist; | |
1104 | _dl_global_scope[0] = &_dl_loaded->l_searchlist; | |
1105 | ||
604510f7 UD |
1106 | /* Safe the information about the original global scope list since |
1107 | we need it in the memory handling later. */ | |
1108 | _dl_initial_searchlist = *_dl_main_searchlist; | |
1109 | ||
4d6acc61 RM |
1110 | { |
1111 | /* Initialize _r_debug. */ | |
1112 | struct r_debug *r = _dl_debug_initialize (_dl_rtld_map.l_addr); | |
ceb2d9aa | 1113 | struct link_map *l; |
4d6acc61 RM |
1114 | |
1115 | l = _dl_loaded; | |
ec42724d RM |
1116 | |
1117 | #ifdef ELF_MACHINE_DEBUG_SETUP | |
1118 | ||
1119 | /* Some machines (e.g. MIPS) don't use DT_DEBUG in this way. */ | |
1120 | ||
1121 | ELF_MACHINE_DEBUG_SETUP (l, r); | |
1122 | ELF_MACHINE_DEBUG_SETUP (&_dl_rtld_map, r); | |
1123 | ||
1124 | #else | |
1125 | ||
4d6acc61 RM |
1126 | if (l->l_info[DT_DEBUG]) |
1127 | /* There is a DT_DEBUG entry in the dynamic section. Fill it in | |
1128 | with the run-time address of the r_debug structure */ | |
1129 | l->l_info[DT_DEBUG]->d_un.d_ptr = (ElfW(Addr)) r; | |
1130 | ||
d746b89c RM |
1131 | /* Fill in the pointer in the dynamic linker's own dynamic section, in |
1132 | case you run gdb on the dynamic linker directly. */ | |
1133 | if (_dl_rtld_map.l_info[DT_DEBUG]) | |
1134 | _dl_rtld_map.l_info[DT_DEBUG]->d_un.d_ptr = (ElfW(Addr)) r; | |
1135 | ||
ec42724d RM |
1136 | #endif |
1137 | ||
4d6acc61 RM |
1138 | /* Notify the debugger that all objects are now mapped in. */ |
1139 | r->r_state = RT_ADD; | |
1140 | _dl_debug_state (); | |
1141 | } | |
0200214b | 1142 | |
08cac4ac UD |
1143 | #ifndef MAP_COPY |
1144 | /* We must munmap() the cache file. */ | |
1145 | _dl_unload_cache (); | |
1146 | #endif | |
1147 | ||
d66e34cd RM |
1148 | /* Once we return, _dl_sysdep_start will invoke |
1149 | the DT_INIT functions and then *USER_ENTRY. */ | |
1150 | } | |
fd26970f UD |
1151 | \f |
1152 | /* This is a little helper function for resolving symbols while | |
1153 | tracing the binary. */ | |
1154 | static void | |
c84142e8 UD |
1155 | print_unresolved (int errcode __attribute__ ((unused)), const char *objname, |
1156 | const char *errstring) | |
fd26970f | 1157 | { |
3996f34b UD |
1158 | if (objname[0] == '\0') |
1159 | objname = _dl_argv[0] ?: "<main program>"; | |
fd26970f UD |
1160 | _dl_sysdep_error (errstring, " (", objname, ")\n", NULL); |
1161 | } | |
c84142e8 UD |
1162 | \f |
1163 | /* This is a little helper function for resolving symbols while | |
1164 | tracing the binary. */ | |
1165 | static void | |
1166 | print_missing_version (int errcode __attribute__ ((unused)), | |
1167 | const char *objname, const char *errstring) | |
1168 | { | |
1169 | _dl_sysdep_error (_dl_argv[0] ?: "<program name unknown>", ": ", | |
1170 | objname, ": ", errstring, "\n", NULL); | |
1171 | } | |
ea278354 | 1172 | \f |
7dea968e UD |
1173 | /* Nonzero if any of the debugging options is enabled. */ |
1174 | static int any_debug; | |
1175 | ||
b5efde2f UD |
1176 | /* Process the string given as the parameter which explains which debugging |
1177 | options are enabled. */ | |
1178 | static void | |
14c44e2e | 1179 | process_dl_debug (const char *dl_debug) |
b5efde2f | 1180 | { |
14c44e2e UD |
1181 | size_t len; |
1182 | #define separators " ,:" | |
b5efde2f UD |
1183 | do |
1184 | { | |
14c44e2e | 1185 | len = 0; |
b5efde2f | 1186 | /* Skip separating white spaces and commas. */ |
14c44e2e | 1187 | dl_debug += strspn (dl_debug, separators); |
b5efde2f UD |
1188 | if (*dl_debug != '\0') |
1189 | { | |
14c44e2e UD |
1190 | len = strcspn (dl_debug, separators); |
1191 | ||
1192 | switch (len) | |
b5efde2f | 1193 | { |
b0b67c47 UD |
1194 | case 3: |
1195 | /* This option is not documented since it is not generally | |
1196 | useful. */ | |
1197 | if (memcmp (dl_debug, "all", 3) == 0) | |
1198 | { | |
1199 | _dl_debug_libs = 1; | |
1200 | _dl_debug_impcalls = 1; | |
1201 | _dl_debug_reloc = 1; | |
1202 | _dl_debug_files = 1; | |
1203 | _dl_debug_symbols = 1; | |
1204 | _dl_debug_bindings = 1; | |
1205 | _dl_debug_versions = 1; | |
1206 | any_debug = 1; | |
ceb27555 | 1207 | continue; |
b0b67c47 UD |
1208 | } |
1209 | break; | |
1210 | ||
14c44e2e UD |
1211 | case 4: |
1212 | if (memcmp (dl_debug, "help", 4) == 0) | |
1213 | { | |
1214 | _dl_sysdep_message ("\ | |
08b511e6 | 1215 | Valid options for the LD_DEBUG environment variable are:\n\ |
b5efde2f | 1216 | \n\ |
5732c4df UD |
1217 | bindings display information about symbol binding\n\ |
1218 | files display processing of files and libraries\n\ | |
1219 | help display this help message and exit\n\ | |
1220 | libs display library search paths\n\ | |
dc911631 UD |
1221 | reloc display relocation processing\n\ |
1222 | statistics display relocation statistics\n\ | |
1223 | symbols display symbol table processing\n\ | |
5732c4df | 1224 | versions display version dependencies\n\ |
0c367d92 UD |
1225 | \n\ |
1226 | To direct the debugging output into a file instead of standard output\n\ | |
1227 | a filename can be specified using the LD_DEBUG_OUTPUT environment variable.\n", | |
1228 | NULL); | |
14c44e2e UD |
1229 | _exit (0); |
1230 | } | |
77aba05b | 1231 | |
14c44e2e UD |
1232 | if (memcmp (dl_debug, "libs", 4) == 0) |
1233 | { | |
1234 | _dl_debug_libs = 1; | |
1235 | _dl_debug_impcalls = 1; | |
1236 | any_debug = 1; | |
1237 | continue; | |
1238 | } | |
1239 | break; | |
1240 | ||
1241 | case 5: | |
1242 | if (memcmp (dl_debug, "reloc", 5) == 0) | |
1243 | { | |
1244 | _dl_debug_reloc = 1; | |
1245 | _dl_debug_impcalls = 1; | |
1246 | any_debug = 1; | |
1247 | continue; | |
1248 | } | |
1249 | ||
1250 | if (memcmp (dl_debug, "files", 5) == 0) | |
1251 | { | |
1252 | _dl_debug_files = 1; | |
1253 | _dl_debug_impcalls = 1; | |
1254 | any_debug = 1; | |
1255 | continue; | |
1256 | } | |
1257 | break; | |
77aba05b | 1258 | |
14c44e2e UD |
1259 | case 7: |
1260 | if (memcmp (dl_debug, "symbols", 7) == 0) | |
1261 | { | |
1262 | _dl_debug_symbols = 1; | |
1263 | _dl_debug_impcalls = 1; | |
1264 | any_debug = 1; | |
1265 | continue; | |
1266 | } | |
1267 | break; | |
77aba05b | 1268 | |
14c44e2e UD |
1269 | case 8: |
1270 | if (memcmp (dl_debug, "bindings", 8) == 0) | |
1271 | { | |
1272 | _dl_debug_bindings = 1; | |
1273 | _dl_debug_impcalls = 1; | |
1274 | any_debug = 1; | |
1275 | continue; | |
1276 | } | |
1277 | ||
1278 | if (memcmp (dl_debug, "versions", 8) == 0) | |
1279 | { | |
1280 | _dl_debug_versions = 1; | |
1281 | _dl_debug_impcalls = 1; | |
1282 | any_debug = 1; | |
1283 | continue; | |
1284 | } | |
1285 | break; | |
1286 | ||
db276fa1 UD |
1287 | case 10: |
1288 | if (memcmp (dl_debug, "statistics", 10) == 0) | |
1289 | { | |
1290 | _dl_debug_statistics = 1; | |
1291 | continue; | |
1292 | } | |
1293 | break; | |
1294 | ||
14c44e2e UD |
1295 | default: |
1296 | break; | |
77aba05b | 1297 | } |
14c44e2e UD |
1298 | |
1299 | { | |
1300 | /* Display a warning and skip everything until next separator. */ | |
1301 | char *startp = strndupa (dl_debug, len); | |
1302 | _dl_sysdep_error ("warning: debug option `", startp, | |
1303 | "' unknown; try LD_DEBUG=help\n", NULL); | |
db276fa1 | 1304 | break; |
14c44e2e | 1305 | } |
b5efde2f UD |
1306 | } |
1307 | } | |
14c44e2e | 1308 | while (*(dl_debug += len) != '\0'); |
b5efde2f UD |
1309 | } |
1310 | \f | |
ea278354 UD |
1311 | /* Process all environments variables the dynamic linker must recognize. |
1312 | Since all of them start with `LD_' we are a bit smarter while finding | |
1313 | all the entries. */ | |
1314 | static void | |
1315 | process_envvars (enum mode *modep, int *lazyp) | |
1316 | { | |
1317 | char **runp = NULL; | |
1318 | char *envline; | |
1319 | enum mode mode = normal; | |
1320 | int bind_now = 0; | |
7dea968e | 1321 | char *debug_output = NULL; |
ea278354 UD |
1322 | |
1323 | /* This is the default place for profiling data file. */ | |
1324 | _dl_profile_output = "/var/tmp"; | |
1325 | ||
1326 | while ((envline = _dl_next_ld_env_entry (&runp)) != NULL) | |
1327 | { | |
75e8d1f5 | 1328 | size_t len = strcspn (envline, "="); |
ea278354 | 1329 | |
75e8d1f5 UD |
1330 | if (envline[len] != '=') |
1331 | /* This is a "LD_" variable at the end of the string without | |
1332 | a '=' character. Ignore it since otherwise we will access | |
1333 | invalid memory below. */ | |
1334 | break; | |
1335 | ||
1336 | switch (len - 3) | |
ea278354 | 1337 | { |
14c44e2e UD |
1338 | case 4: |
1339 | /* Warning level, verbose or not. */ | |
1340 | if (memcmp (&envline[3], "WARN", 4) == 0) | |
1341 | _dl_verbose = envline[8] != '\0'; | |
1342 | break; | |
ea278354 | 1343 | |
14c44e2e UD |
1344 | case 5: |
1345 | /* Debugging of the dynamic linker? */ | |
1346 | if (memcmp (&envline[3], "DEBUG", 5) == 0) | |
1347 | process_dl_debug (&envline[9]); | |
1348 | break; | |
b5efde2f | 1349 | |
14c44e2e UD |
1350 | case 7: |
1351 | /* Print information about versions. */ | |
1352 | if (memcmp (&envline[3], "VERBOSE", 7) == 0) | |
1353 | { | |
1354 | version_info = envline[11] != '\0'; | |
1355 | break; | |
1356 | } | |
7dea968e | 1357 | |
14c44e2e UD |
1358 | /* List of objects to be preloaded. */ |
1359 | if (memcmp (&envline[3], "PRELOAD", 7) == 0) | |
1360 | { | |
1361 | preloadlist = &envline[11]; | |
1362 | break; | |
1363 | } | |
120b4c49 | 1364 | |
14c44e2e UD |
1365 | /* Which shared object shall be profiled. */ |
1366 | if (memcmp (&envline[3], "PROFILE", 7) == 0) | |
722c33bb | 1367 | _dl_profile = &envline[11]; |
14c44e2e | 1368 | break; |
120b4c49 | 1369 | |
14c44e2e UD |
1370 | case 8: |
1371 | /* Do we bind early? */ | |
0e103c6d UD |
1372 | if (memcmp (&envline[3], "BIND_NOW", 8) == 0) |
1373 | bind_now = envline[12] != '\0'; | |
14c44e2e | 1374 | break; |
ea278354 | 1375 | |
14c44e2e UD |
1376 | case 9: |
1377 | /* Test whether we want to see the content of the auxiliary | |
1378 | array passed up from the kernel. */ | |
1379 | if (memcmp (&envline[3], "SHOW_AUXV", 9) == 0) | |
1380 | _dl_show_auxv (); | |
1381 | break; | |
ea278354 | 1382 | |
12264bd7 | 1383 | case 10: |
3081378b | 1384 | /* Mask for the important hardware capabilities. */ |
12264bd7 UD |
1385 | if (memcmp (&envline[3], "HWCAP_MASK", 10) == 0) |
1386 | _dl_hwcap_mask = strtoul (&envline[14], NULL, 0); | |
1387 | break; | |
1388 | ||
f787edde UD |
1389 | case 11: |
1390 | /* Path where the binary is found. */ | |
45769315 UD |
1391 | if (!__libc_enable_secure |
1392 | && memcmp (&envline[3], "ORIGIN_PATH", 11) == 0) | |
997a4165 | 1393 | _dl_origin_path = &envline[15]; |
f787edde UD |
1394 | break; |
1395 | ||
14c44e2e | 1396 | case 12: |
dec126b4 UD |
1397 | /* The library search path. */ |
1398 | if (memcmp (&envline[3], "LIBRARY_PATH", 12) == 0) | |
1399 | { | |
1400 | library_path = &envline[16]; | |
1401 | break; | |
1402 | } | |
1403 | ||
14c44e2e UD |
1404 | /* Where to place the profiling data file. */ |
1405 | if (memcmp (&envline[3], "DEBUG_OUTPUT", 12) == 0) | |
1406 | { | |
1407 | debug_output = &envline[16]; | |
1408 | break; | |
1409 | } | |
ea278354 | 1410 | |
dec126b4 UD |
1411 | if (memcmp (&envline[3], "DYNAMIC_WEAK", 12) == 0) |
1412 | _dl_dynamic_weak = 1; | |
14c44e2e | 1413 | break; |
ea278354 | 1414 | |
14c44e2e UD |
1415 | case 14: |
1416 | /* Where to place the profiling data file. */ | |
3081378b UD |
1417 | if (!__libc_enable_secure |
1418 | && memcmp (&envline[3], "PROFILE_OUTPUT", 14) == 0) | |
14c44e2e UD |
1419 | { |
1420 | _dl_profile_output = &envline[18]; | |
1421 | if (*_dl_profile_output == '\0') | |
1422 | _dl_profile_output = "/var/tmp"; | |
1423 | } | |
1424 | break; | |
120b4c49 | 1425 | |
14c44e2e UD |
1426 | case 20: |
1427 | /* The mode of the dynamic linker can be set. */ | |
1428 | if (memcmp (&envline[3], "TRACE_LOADED_OBJECTS", 20) == 0) | |
1429 | mode = trace; | |
1430 | break; | |
e2102c14 UD |
1431 | |
1432 | /* We might have some extra environment variable to handle. This | |
1433 | is tricky due to the pre-processing of the length of the name | |
1434 | in the switch statement here. The code here assumes that added | |
1435 | environment variables have a different length. */ | |
1436 | #ifdef EXTRA_LD_ENVVARS | |
1437 | EXTRA_LD_ENVVARS | |
1438 | #endif | |
ea278354 UD |
1439 | } |
1440 | } | |
1441 | ||
4bae5567 UD |
1442 | /* Extra security for SUID binaries. Remove all dangerous environment |
1443 | variables. */ | |
1444 | if (__libc_enable_secure) | |
1445 | { | |
1446 | static const char *unsecure_envvars[] = | |
1447 | { | |
1448 | #ifdef EXTRA_UNSECURE_ENVVARS | |
1449 | EXTRA_UNSECURE_ENVVARS | |
1450 | #endif | |
1451 | }; | |
1452 | size_t cnt; | |
1453 | ||
1454 | if (preloadlist != NULL) | |
1455 | unsetenv ("LD_PRELOAD"); | |
1456 | if (library_path != NULL) | |
1457 | unsetenv ("LD_LIBRARY_PATH"); | |
722c33bb UD |
1458 | if (_dl_origin_path != NULL) |
1459 | unsetenv ("LD_ORIGIN_PATH"); | |
1460 | if (debug_output != NULL) | |
1461 | unsetenv ("LD_DEBUG_OUTPUT"); | |
1462 | if (_dl_profile != NULL) | |
1463 | unsetenv ("LD_PROFILE"); | |
4bae5567 UD |
1464 | |
1465 | for (cnt = 0; | |
1466 | cnt < sizeof (unsecure_envvars) / sizeof (unsecure_envvars[0]); | |
1467 | ++cnt) | |
1468 | unsetenv (unsecure_envvars[cnt]); | |
1469 | } | |
1470 | ||
722c33bb UD |
1471 | /* The name of the object to profile cannot be empty. */ |
1472 | if (_dl_profile != NULL && *_dl_profile == '\0') | |
1473 | _dl_profile = NULL; | |
1474 | ||
7dea968e UD |
1475 | /* If we have to run the dynamic linker in debugging mode and the |
1476 | LD_DEBUG_OUTPUT environment variable is given, we write the debug | |
1477 | messages to this file. */ | |
14c44e2e | 1478 | if (any_debug && debug_output != NULL && !__libc_enable_secure) |
7dea968e | 1479 | { |
7a2fd787 UD |
1480 | size_t name_len = strlen (debug_output); |
1481 | char buf[name_len + 12]; | |
1482 | char *startp; | |
1483 | ||
1484 | buf[name_len + 11] = '\0'; | |
1485 | startp = _itoa_word (__getpid (), &buf[name_len + 11], 10, 0); | |
1486 | *--startp = '.'; | |
1487 | startp = memcpy (startp - name_len, debug_output, name_len); | |
1488 | ||
1489 | _dl_debug_fd = __open (startp, O_WRONLY | O_APPEND | O_CREAT, 0666); | |
7dea968e UD |
1490 | if (_dl_debug_fd == -1) |
1491 | /* We use standard output if opening the file failed. */ | |
1492 | _dl_debug_fd = STDOUT_FILENO; | |
1493 | } | |
1494 | ||
ea278354 UD |
1495 | /* LAZY is determined by the environment variable LD_WARN and |
1496 | LD_BIND_NOW if we trace the binary. */ | |
9a821cf9 | 1497 | if (__builtin_expect (mode, normal) == trace) |
ea278354 UD |
1498 | *lazyp = _dl_verbose ? !bind_now : -1; |
1499 | else | |
57de5037 | 1500 | *lazyp = !bind_now; |
ea278354 UD |
1501 | |
1502 | *modep = mode; | |
1503 | } | |
db276fa1 UD |
1504 | |
1505 | ||
1506 | /* Print the various times we collected. */ | |
1507 | static void | |
1508 | print_statistics (void) | |
1509 | { | |
1510 | char buf[200]; | |
8b07d6a8 | 1511 | #ifndef HP_TIMING_NONAVAIL |
db276fa1 UD |
1512 | char *cp; |
1513 | char *wp; | |
1514 | ||
1515 | /* Total time rtld used. */ | |
1516 | if (HP_TIMING_AVAIL) | |
1517 | { | |
1518 | HP_TIMING_PRINT (buf, sizeof (buf), rtld_total_time); | |
1519 | _dl_debug_message (1, "\nruntime linker statistics:\n" | |
1520 | " total startup time in dynamic loader: ", | |
1521 | buf, "\n", NULL); | |
1522 | } | |
1523 | ||
1524 | /* Print relocation statistics. */ | |
1525 | if (HP_TIMING_AVAIL) | |
1526 | { | |
1527 | HP_TIMING_PRINT (buf, sizeof (buf), relocate_time); | |
1528 | _dl_debug_message (1, " time needed for relocation: ", buf, | |
1529 | NULL); | |
1530 | cp = _itoa_word ((1000 * relocate_time) / rtld_total_time, | |
1531 | buf + sizeof (buf), 10, 0); | |
1532 | wp = buf; | |
1533 | switch (buf + sizeof (buf) - cp) | |
1534 | { | |
1535 | case 3: | |
1536 | *wp++ = *cp++; | |
1537 | case 2: | |
1538 | *wp++ = *cp++; | |
1539 | case 1: | |
1540 | *wp++ = '.'; | |
1541 | *wp++ = *cp++; | |
1542 | } | |
1543 | *wp = '\0'; | |
1544 | _dl_debug_message (0, " (", buf, "%)\n", NULL); | |
1545 | } | |
1531e094 | 1546 | #endif |
db276fa1 UD |
1547 | buf[sizeof (buf) - 1] = '\0'; |
1548 | _dl_debug_message (1, " number of relocations: ", | |
1549 | _itoa_word (_dl_num_relocations, | |
1550 | buf + sizeof (buf) - 1, 10, 0), | |
1551 | "\n", NULL); | |
1552 | ||
1531e094 | 1553 | #ifndef HP_TIMING_NONAVAIL |
db276fa1 UD |
1554 | /* Time spend while loading the object and the dependencies. */ |
1555 | if (HP_TIMING_AVAIL) | |
1556 | { | |
1557 | HP_TIMING_PRINT (buf, sizeof (buf), load_time); | |
1558 | _dl_debug_message (1, " time needed to load objects: ", buf, | |
1559 | NULL); | |
1560 | cp = _itoa_word ((1000 * load_time) / rtld_total_time, | |
1561 | buf + sizeof (buf), 10, 0); | |
1562 | wp = buf; | |
1563 | switch (buf + sizeof (buf) - cp) | |
1564 | { | |
1565 | case 3: | |
1566 | *wp++ = *cp++; | |
1567 | case 2: | |
1568 | *wp++ = *cp++; | |
1569 | case 1: | |
1570 | *wp++ = '.'; | |
1571 | *wp++ = *cp++; | |
1572 | } | |
1573 | *wp = '\0'; | |
1574 | _dl_debug_message (0, " (", buf, "%)\n", NULL); | |
1575 | } | |
1531e094 | 1576 | #endif |
db276fa1 | 1577 | } |