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d66e34cd | 1 | /* Run time dynamic linker. |
92effacf | 2 | Copyright (C) 1995-1999, 2000, 2001 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 AJ |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, write to the Free | |
17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
18 | 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. */ |
af8bf6bd | 25 | #include <sys/param.h> |
ba9fcb3f | 26 | #include <sys/stat.h> |
a42195db | 27 | #include <ldsodefs.h> |
ce37fa88 | 28 | #include <stdio-common/_itoa.h> |
f21acc89 | 29 | #include <entry.h> |
c94a8080 | 30 | #include <fpu_control.h> |
db276fa1 | 31 | #include <hp-timing.h> |
cf197e41 | 32 | #include <bits/libc-lock.h> |
f5348425 | 33 | #include "dynamic-link.h" |
e2102c14 | 34 | #include "dl-librecon.h" |
74955460 | 35 | #include <unsecvars.h> |
f5348425 | 36 | |
a853022c | 37 | #include <assert.h> |
f5348425 | 38 | |
fd26970f | 39 | /* Helper function to handle errors while resolving symbols. */ |
c84142e8 UD |
40 | static void print_unresolved (int errcode, const char *objname, |
41 | const char *errsting); | |
42 | ||
43 | /* Helper function to handle errors when a version is missing. */ | |
44 | static void print_missing_version (int errcode, const char *objname, | |
45 | const char *errsting); | |
fd26970f | 46 | |
db276fa1 UD |
47 | /* Print the various times we collected. */ |
48 | static void print_statistics (void); | |
ea278354 UD |
49 | |
50 | /* This is a list of all the modes the dynamic loader can be in. */ | |
51 | enum mode { normal, list, verify, trace }; | |
52 | ||
53 | /* Process all environments variables the dynamic linker must recognize. | |
54 | Since all of them start with `LD_' we are a bit smarter while finding | |
55 | all the entries. */ | |
ba9fcb3f | 56 | static void process_envvars (enum mode *modep); |
ea278354 | 57 | |
d66e34cd RM |
58 | int _dl_argc; |
59 | char **_dl_argv; | |
ceb27555 | 60 | unsigned int _dl_skip_args; /* Nonzero if we were run directly. */ |
cf29ffbe | 61 | int _dl_verbose; |
0a54e401 UD |
62 | const char *_dl_platform; |
63 | size_t _dl_platformlen; | |
f41c8091 | 64 | unsigned long _dl_hwcap; |
c94a8080 | 65 | fpu_control_t _dl_fpu_control = _FPU_DEFAULT; |
0a54e401 | 66 | struct r_search_path *_dl_search_paths; |
3996f34b UD |
67 | const char *_dl_profile; |
68 | const char *_dl_profile_output; | |
a3d6fb9b | 69 | struct link_map *_dl_profile_map; |
ba9fcb3f | 70 | int _dl_lazy = 1; |
8a0e201e UD |
71 | /* XXX I know about at least one case where we depend on the old weak |
72 | behavior (it has to do with librt). Until we get DSO groups implemented | |
73 | we have to make this the default. Bummer. --drepper */ | |
74 | #if 0 | |
dec126b4 | 75 | int _dl_dynamic_weak; |
8a0e201e UD |
76 | #else |
77 | int _dl_dynamic_weak = 1; | |
78 | #endif | |
62dcee57 | 79 | int _dl_debug_mask; |
b0a01055 | 80 | const char *_dl_inhibit_rpath; /* RPATH values which should be |
310930c1 | 81 | ignored. */ |
f787edde | 82 | const char *_dl_origin_path; |
f53c03c2 | 83 | int _dl_bind_not; |
d66e34cd | 84 | |
be935610 UD |
85 | /* This is a pointer to the map for the main object and through it to |
86 | all loaded objects. */ | |
87 | struct link_map *_dl_loaded; | |
1ebba33e UD |
88 | /* Number of object in the _dl_loaded list. */ |
89 | unsigned int _dl_nloaded; | |
be935610 UD |
90 | /* Pointer to the l_searchlist element of the link map of the main object. */ |
91 | struct r_scope_elem *_dl_main_searchlist; | |
604510f7 UD |
92 | /* Copy of the content of `_dl_main_searchlist'. */ |
93 | struct r_scope_elem _dl_initial_searchlist; | |
be935610 UD |
94 | /* Array which is used when looking up in the global scope. */ |
95 | struct r_scope_elem *_dl_global_scope[2]; | |
96 | ||
cf197e41 UD |
97 | /* During the program run we must not modify the global data of |
98 | loaded shared object simultanously in two threads. Therefore we | |
99 | protect `_dl_open' and `_dl_close' in dl-close.c. | |
100 | ||
101 | This must be a recursive lock since the initializer function of | |
102 | the loaded object might as well require a call to this function. | |
103 | At this time it is not anymore a problem to modify the tables. */ | |
104 | __libc_lock_define_initialized_recursive (, _dl_load_lock) | |
105 | ||
39778c6c UD |
106 | /* Set nonzero during loading and initialization of executable and |
107 | libraries, cleared before the executable's entry point runs. This | |
108 | must not be initialized to nonzero, because the unused dynamic | |
109 | linker loaded in for libc.so's "ld.so.1" dep will provide the | |
110 | definition seen by libc.so's initializer; that value must be zero, | |
111 | and will be since that dynamic linker's _dl_start and dl_main will | |
112 | never be called. */ | |
113 | int _dl_starting_up; | |
114 | ||
c0fb8a56 | 115 | |
266180eb | 116 | static void dl_main (const ElfW(Phdr) *phdr, |
72f70279 | 117 | ElfW(Word) phnum, |
266180eb | 118 | ElfW(Addr) *user_entry); |
d66e34cd | 119 | |
ee188d55 | 120 | struct link_map _dl_rtld_map; |
c84142e8 | 121 | struct libname_list _dl_rtld_libname; |
f41c8091 | 122 | struct libname_list _dl_rtld_libname2; |
86d2c878 | 123 | |
db276fa1 | 124 | /* Variable for statistics. */ |
5732c4df | 125 | #ifndef HP_TIMING_NONAVAIL |
db276fa1 UD |
126 | static hp_timing_t rtld_total_time; |
127 | static hp_timing_t relocate_time; | |
128 | static hp_timing_t load_time; | |
5732c4df | 129 | #endif |
db276fa1 | 130 | extern unsigned long int _dl_num_relocations; /* in dl-lookup.c */ |
647eb037 | 131 | extern unsigned long int _dl_num_cache_relocations; /* in dl-lookup.c */ |
db276fa1 | 132 | |
6a1db4ff UD |
133 | static ElfW(Addr) _dl_start_final (void *arg, struct link_map *bootstrap_map_p, |
134 | hp_timing_t start_time); | |
135 | ||
b1dbbaa4 RM |
136 | #ifdef RTLD_START |
137 | RTLD_START | |
138 | #else | |
139 | #error "sysdeps/MACHINE/dl-machine.h fails to define RTLD_START" | |
140 | #endif | |
141 | ||
ceb2d9aa | 142 | static ElfW(Addr) |
d66e34cd RM |
143 | _dl_start (void *arg) |
144 | { | |
86d2c878 | 145 | struct link_map bootstrap_map; |
db276fa1 | 146 | hp_timing_t start_time; |
264ec183 | 147 | size_t cnt; |
d66e34cd | 148 | |
b1dbbaa4 RM |
149 | /* This #define produces dynamic linking inline functions for |
150 | bootstrap relocation instead of general-purpose relocation. */ | |
151 | #define RTLD_BOOTSTRAP | |
c0282c06 UD |
152 | #define RESOLVE_MAP(sym, version, flags) \ |
153 | ((*(sym))->st_shndx == SHN_UNDEF ? 0 : &bootstrap_map) | |
50463d27 UD |
154 | #define RESOLVE(sym, version, flags) \ |
155 | ((*(sym))->st_shndx == SHN_UNDEF ? 0 : bootstrap_map.l_addr) | |
b1dbbaa4 RM |
156 | #include "dynamic-link.h" |
157 | ||
db276fa1 UD |
158 | if (HP_TIMING_INLINE && HP_TIMING_AVAIL) |
159 | HP_TIMING_NOW (start_time); | |
160 | ||
264ec183 | 161 | /* Partly clean the `bootstrap_map' structure up. Don't use `memset' |
370f00c3 | 162 | since it might not be built in or inlined and we cannot make function |
264ec183 UD |
163 | calls at this point. */ |
164 | for (cnt = 0; | |
165 | cnt < sizeof (bootstrap_map.l_info) / sizeof (bootstrap_map.l_info[0]); | |
166 | ++cnt) | |
167 | bootstrap_map.l_info[cnt] = 0; | |
168 | ||
d66e34cd | 169 | /* Figure out the run-time load address of the dynamic linker itself. */ |
86d2c878 | 170 | bootstrap_map.l_addr = elf_machine_load_address (); |
d66e34cd | 171 | |
47707456 UD |
172 | /* Read our own dynamic section and fill in the info array. */ |
173 | bootstrap_map.l_ld = (void *) bootstrap_map.l_addr + elf_machine_dynamic (); | |
d3ac2d47 | 174 | elf_get_dynamic_info (&bootstrap_map); |
d66e34cd RM |
175 | |
176 | #ifdef ELF_MACHINE_BEFORE_RTLD_RELOC | |
86d2c878 | 177 | ELF_MACHINE_BEFORE_RTLD_RELOC (bootstrap_map.l_info); |
d66e34cd RM |
178 | #endif |
179 | ||
180 | /* Relocate ourselves so we can do normal function calls and | |
181 | data access using the global offset table. */ | |
421f82e5 | 182 | |
3996f34b | 183 | ELF_DYNAMIC_RELOCATE (&bootstrap_map, 0, 0); |
ea7eb7e3 UD |
184 | /* Please note that we don't allow profiling of this object and |
185 | therefore need not test whether we have to allocate the array | |
186 | for the relocation results (as done in dl-reloc.c). */ | |
421f82e5 | 187 | |
d66e34cd RM |
188 | /* Now life is sane; we can call functions and access global data. |
189 | Set up to use the operating system facilities, and find out from | |
190 | the operating system's program loader where to find the program | |
6a1db4ff UD |
191 | header table in core. Put the rest of _dl_start into a separate |
192 | function, that way the compiler cannot put accesses to the GOT | |
193 | before ELF_DYNAMIC_RELOCATE. */ | |
c0282c06 UD |
194 | { |
195 | ElfW(Addr) entry = _dl_start_final (arg, &bootstrap_map, start_time); | |
196 | ||
197 | #ifndef ELF_MACHINE_START_ADDRESS | |
198 | # define ELF_MACHINE_START_ADDRESS(map, start) (start) | |
199 | #endif | |
200 | ||
201 | return ELF_MACHINE_START_ADDRESS (_dl_loaded, entry); | |
202 | } | |
6a1db4ff UD |
203 | } |
204 | ||
205 | ||
206 | static ElfW(Addr) | |
207 | _dl_start_final (void *arg, struct link_map *bootstrap_map_p, | |
208 | hp_timing_t start_time) | |
209 | { | |
210 | /* The use of `alloca' here looks ridiculous but it helps. The goal | |
211 | is to avoid the function from being inlined. There is no official | |
212 | way to do this so we use this trick. gcc never inlines functions | |
213 | which use `alloca'. */ | |
214 | ElfW(Addr) *start_addr = alloca (sizeof (ElfW(Addr))); | |
d66e34cd | 215 | |
db276fa1 UD |
216 | if (HP_TIMING_AVAIL) |
217 | { | |
218 | /* If it hasn't happen yet record the startup time. */ | |
219 | if (! HP_TIMING_INLINE) | |
220 | HP_TIMING_NOW (start_time); | |
221 | ||
222 | /* Initialize the timing functions. */ | |
223 | HP_TIMING_DIFF_INIT (); | |
224 | } | |
225 | ||
86d2c878 | 226 | /* Transfer data about ourselves to the permanent link_map structure. */ |
6a1db4ff UD |
227 | _dl_rtld_map.l_addr = bootstrap_map_p->l_addr; |
228 | _dl_rtld_map.l_ld = bootstrap_map_p->l_ld; | |
f41c8091 | 229 | _dl_rtld_map.l_opencount = 1; |
6a1db4ff | 230 | memcpy (_dl_rtld_map.l_info, bootstrap_map_p->l_info, |
ee188d55 RM |
231 | sizeof _dl_rtld_map.l_info); |
232 | _dl_setup_hash (&_dl_rtld_map); | |
370f00c3 | 233 | _dl_rtld_map.l_mach = bootstrap_map_p->l_mach; |
86d2c878 | 234 | |
052b6a6c UD |
235 | /* Don't bother trying to work out how ld.so is mapped in memory. */ |
236 | _dl_rtld_map.l_map_start = ~0; | |
237 | _dl_rtld_map.l_map_end = ~0; | |
238 | ||
d66e34cd RM |
239 | /* Call the OS-dependent function to set up life so we can do things like |
240 | file access. It will call `dl_main' (below) to do all the real work | |
241 | of the dynamic linker, and then unwind our frame and run the user | |
242 | entry point on the same stack we entered on. */ | |
6a1db4ff | 243 | *start_addr = _dl_sysdep_start (arg, &dl_main); |
8b07d6a8 | 244 | #ifndef HP_TIMING_NONAVAIL |
db276fa1 UD |
245 | if (HP_TIMING_AVAIL) |
246 | { | |
247 | hp_timing_t end_time; | |
248 | ||
249 | /* Get the current time. */ | |
250 | HP_TIMING_NOW (end_time); | |
251 | ||
252 | /* Compute the difference. */ | |
253 | HP_TIMING_DIFF (rtld_total_time, start_time, end_time); | |
254 | } | |
8b07d6a8 | 255 | #endif |
db276fa1 | 256 | |
2ace5721 | 257 | if (__builtin_expect (_dl_debug_mask & DL_DEBUG_STATISTICS, 0)) |
db276fa1 UD |
258 | print_statistics (); |
259 | ||
6a1db4ff | 260 | return *start_addr; |
d66e34cd RM |
261 | } |
262 | ||
d66e34cd RM |
263 | /* Now life is peachy; we can do all normal operations. |
264 | On to the real work. */ | |
265 | ||
993b3242 UD |
266 | /* Some helper functions. */ |
267 | ||
268 | /* Arguments to relocate_doit. */ | |
269 | struct relocate_args | |
270 | { | |
271 | struct link_map *l; | |
272 | int lazy; | |
273 | }; | |
274 | ||
275 | struct map_args | |
276 | { | |
277 | /* Argument to map_doit. */ | |
278 | char *str; | |
279 | /* Return value of map_doit. */ | |
280 | struct link_map *main_map; | |
281 | }; | |
282 | ||
283 | /* Arguments to version_check_doit. */ | |
284 | struct version_check_args | |
285 | { | |
993b3242 | 286 | int doexit; |
145b8413 | 287 | int dotrace; |
993b3242 UD |
288 | }; |
289 | ||
290 | static void | |
291 | relocate_doit (void *a) | |
292 | { | |
293 | struct relocate_args *args = (struct relocate_args *) a; | |
294 | ||
be935610 | 295 | _dl_relocate_object (args->l, args->l->l_scope, |
c0fb8a56 | 296 | args->lazy, 0); |
993b3242 UD |
297 | } |
298 | ||
299 | static void | |
300 | map_doit (void *a) | |
301 | { | |
be935610 | 302 | struct map_args *args = (struct map_args *) a; |
bf8b3e74 | 303 | args->main_map = _dl_map_object (NULL, args->str, 0, lt_library, 0, 0); |
993b3242 UD |
304 | } |
305 | ||
306 | static void | |
307 | version_check_doit (void *a) | |
308 | { | |
be935610 | 309 | struct version_check_args *args = (struct version_check_args *) a; |
145b8413 | 310 | if (_dl_check_all_versions (_dl_loaded, 1, args->dotrace) && args->doexit) |
993b3242 UD |
311 | /* We cannot start the application. Abort now. */ |
312 | _exit (1); | |
313 | } | |
314 | ||
ce37fa88 UD |
315 | |
316 | static inline struct link_map * | |
317 | find_needed (const char *name) | |
318 | { | |
be935610 | 319 | unsigned int n = _dl_loaded->l_searchlist.r_nlist; |
ce37fa88 | 320 | |
be935610 UD |
321 | while (n-- > 0) |
322 | if (_dl_name_match_p (name, _dl_loaded->l_searchlist.r_list[n])) | |
323 | return _dl_loaded->l_searchlist.r_list[n]; | |
ce37fa88 UD |
324 | |
325 | /* Should never happen. */ | |
326 | return NULL; | |
327 | } | |
328 | ||
329 | static int | |
330 | match_version (const char *string, struct link_map *map) | |
331 | { | |
a42195db | 332 | const char *strtab = (const void *) D_PTR (map, l_info[DT_STRTAB]); |
ce37fa88 UD |
333 | ElfW(Verdef) *def; |
334 | ||
b0982c4a | 335 | #define VERDEFTAG (DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGIDX (DT_VERDEF)) |
ce37fa88 UD |
336 | if (map->l_info[VERDEFTAG] == NULL) |
337 | /* The file has no symbol versioning. */ | |
338 | return 0; | |
339 | ||
340 | def = (ElfW(Verdef) *) ((char *) map->l_addr | |
341 | + map->l_info[VERDEFTAG]->d_un.d_ptr); | |
342 | while (1) | |
343 | { | |
344 | ElfW(Verdaux) *aux = (ElfW(Verdaux) *) ((char *) def + def->vd_aux); | |
345 | ||
346 | /* Compare the version strings. */ | |
347 | if (strcmp (string, strtab + aux->vda_name) == 0) | |
348 | /* Bingo! */ | |
349 | return 1; | |
350 | ||
351 | /* If no more definitions we failed to find what we want. */ | |
352 | if (def->vd_next == 0) | |
353 | break; | |
354 | ||
355 | /* Next definition. */ | |
356 | def = (ElfW(Verdef) *) ((char *) def + def->vd_next); | |
357 | } | |
358 | ||
359 | return 0; | |
360 | } | |
361 | ||
120b4c49 UD |
362 | static const char *library_path; /* The library search path. */ |
363 | static const char *preloadlist; /* The list preloaded objects. */ | |
364 | static int version_info; /* Nonzero if information about | |
365 | versions has to be printed. */ | |
a1a9d215 | 366 | |
d66e34cd | 367 | static void |
266180eb | 368 | dl_main (const ElfW(Phdr) *phdr, |
72f70279 | 369 | ElfW(Word) phnum, |
266180eb | 370 | ElfW(Addr) *user_entry) |
d66e34cd | 371 | { |
266180eb | 372 | const ElfW(Phdr) *ph; |
ea278354 | 373 | enum mode mode; |
2064087b RM |
374 | struct link_map **preloads; |
375 | unsigned int npreloads; | |
14bab8de UD |
376 | size_t file_size; |
377 | char *file; | |
2f6d1f1b | 378 | int has_interp = 0; |
77aba05b | 379 | unsigned int i; |
9a51759b | 380 | int rtld_is_main = 0; |
5732c4df | 381 | #ifndef HP_TIMING_NONAVAIL |
db276fa1 UD |
382 | hp_timing_t start; |
383 | hp_timing_t stop; | |
384 | hp_timing_t diff; | |
5732c4df | 385 | #endif |
d66e34cd | 386 | |
ea278354 | 387 | /* Process the environment variable which control the behaviour. */ |
ba9fcb3f | 388 | process_envvars (&mode); |
3996f34b | 389 | |
46ec036d UD |
390 | /* Set up a flag which tells we are just starting. */ |
391 | _dl_starting_up = 1; | |
392 | ||
a16956f3 | 393 | if (*user_entry == (ElfW(Addr)) ENTRY_POINT) |
0200214b RM |
394 | { |
395 | /* Ho ho. We are not the program interpreter! We are the program | |
396 | itself! This means someone ran ld.so as a command. Well, that | |
397 | might be convenient to do sometimes. We support it by | |
398 | interpreting the args like this: | |
399 | ||
400 | ld.so PROGRAM ARGS... | |
401 | ||
402 | The first argument is the name of a file containing an ELF | |
403 | executable we will load and run with the following arguments. | |
404 | To simplify life here, PROGRAM is searched for using the | |
405 | normal rules for shared objects, rather than $PATH or anything | |
406 | like that. We just load it and use its entry point; we don't | |
407 | pay attention to its PT_INTERP command (we are the interpreter | |
408 | ourselves). This is an easy way to test a new ld.so before | |
409 | installing it. */ | |
9a51759b | 410 | rtld_is_main = 1; |
421f82e5 | 411 | |
ffee1316 RM |
412 | /* Note the place where the dynamic linker actually came from. */ |
413 | _dl_rtld_map.l_name = _dl_argv[0]; | |
6a76c115 | 414 | |
fd26970f UD |
415 | while (_dl_argc > 1) |
416 | if (! strcmp (_dl_argv[1], "--list")) | |
417 | { | |
418 | mode = list; | |
12b5b6b7 | 419 | _dl_lazy = -1; /* This means do no dependency analysis. */ |
61965e9b | 420 | |
fd26970f UD |
421 | ++_dl_skip_args; |
422 | --_dl_argc; | |
423 | ++_dl_argv; | |
424 | } | |
425 | else if (! strcmp (_dl_argv[1], "--verify")) | |
426 | { | |
427 | mode = verify; | |
6a76c115 | 428 | |
fd26970f UD |
429 | ++_dl_skip_args; |
430 | --_dl_argc; | |
431 | ++_dl_argv; | |
432 | } | |
310930c1 | 433 | else if (! strcmp (_dl_argv[1], "--library-path") && _dl_argc > 2) |
880f421f UD |
434 | { |
435 | library_path = _dl_argv[2]; | |
436 | ||
310930c1 UD |
437 | _dl_skip_args += 2; |
438 | _dl_argc -= 2; | |
439 | _dl_argv += 2; | |
440 | } | |
b0a01055 | 441 | else if (! strcmp (_dl_argv[1], "--inhibit-rpath") && _dl_argc > 2) |
310930c1 | 442 | { |
b0a01055 | 443 | _dl_inhibit_rpath = _dl_argv[2]; |
310930c1 | 444 | |
880f421f UD |
445 | _dl_skip_args += 2; |
446 | _dl_argc -= 2; | |
447 | _dl_argv += 2; | |
448 | } | |
fd26970f UD |
449 | else |
450 | break; | |
d66e34cd | 451 | |
61eb22d3 UD |
452 | /* If we have no further argument the program was called incorrectly. |
453 | Grant the user some education. */ | |
454 | if (_dl_argc < 2) | |
35fc382a | 455 | _dl_fatal_printf ("\ |
2bcf29ba | 456 | Usage: ld.so [OPTION]... EXECUTABLE-FILE [ARGS-FOR-PROGRAM...]\n\ |
61eb22d3 UD |
457 | You have invoked `ld.so', the helper program for shared library executables.\n\ |
458 | This program usually lives in the file `/lib/ld.so', and special directives\n\ | |
459 | in executable files using ELF shared libraries tell the system's program\n\ | |
460 | loader to load the helper program from this file. This helper program loads\n\ | |
461 | the shared libraries needed by the program executable, prepares the program\n\ | |
462 | to run, and runs it. You may invoke this helper program directly from the\n\ | |
463 | command line to load and run an ELF executable file; this is like executing\n\ | |
464 | that file itself, but always uses this helper program from the file you\n\ | |
465 | specified, instead of the helper program file specified in the executable\n\ | |
466 | file you run. This is mostly of use for maintainers to test new versions\n\ | |
2bcf29ba UD |
467 | of this helper program; chances are you did not intend to run this program.\n\ |
468 | \n\ | |
b0a01055 UD |
469 | --list list all dependencies and how they are resolved\n\ |
470 | --verify verify that given object really is a dynamically linked\n\ | |
e8b1163e | 471 | object we can handle\n\ |
b0a01055 UD |
472 | --library-path PATH use given PATH instead of content of the environment\n\ |
473 | variable LD_LIBRARY_PATH\n\ | |
fcf70d41 | 474 | --inhibit-rpath LIST ignore RUNPATH and RPATH information in object names\n\ |
35fc382a | 475 | in LIST\n"); |
61eb22d3 | 476 | |
0200214b RM |
477 | ++_dl_skip_args; |
478 | --_dl_argc; | |
479 | ++_dl_argv; | |
91f62ce6 | 480 | |
da832465 UD |
481 | /* Initialize the data structures for the search paths for shared |
482 | objects. */ | |
483 | _dl_init_paths (library_path); | |
484 | ||
9a821cf9 | 485 | if (__builtin_expect (mode, normal) == verify) |
2de99474 | 486 | { |
8e17ea58 UD |
487 | const char *objname; |
488 | const char *err_str = NULL; | |
993b3242 | 489 | struct map_args args; |
2de99474 | 490 | |
993b3242 | 491 | args.str = _dl_argv[0]; |
8e17ea58 UD |
492 | (void) _dl_catch_error (&objname, &err_str, map_doit, &args); |
493 | if (__builtin_expect (err_str != NULL, 0)) | |
dcf0671d | 494 | { |
ca3c0135 UD |
495 | if (err_str != _dl_out_of_memory) |
496 | free ((char *) err_str); | |
dcf0671d UD |
497 | _exit (EXIT_FAILURE); |
498 | } | |
2de99474 UD |
499 | } |
500 | else | |
db276fa1 UD |
501 | { |
502 | HP_TIMING_NOW (start); | |
bf8b3e74 | 503 | _dl_map_object (NULL, _dl_argv[0], 0, lt_library, 0, 0); |
db276fa1 | 504 | HP_TIMING_NOW (stop); |
61e0617a | 505 | |
db276fa1 UD |
506 | HP_TIMING_DIFF (load_time, start, stop); |
507 | } | |
2de99474 | 508 | |
be935610 | 509 | phdr = _dl_loaded->l_phdr; |
72f70279 | 510 | phnum = _dl_loaded->l_phnum; |
143e2b96 UD |
511 | /* We overwrite here a pointer to a malloc()ed string. But since |
512 | the malloc() implementation used at this point is the dummy | |
513 | implementations which has no real free() function it does not | |
514 | makes sense to free the old string first. */ | |
be935610 UD |
515 | _dl_loaded->l_name = (char *) ""; |
516 | *user_entry = _dl_loaded->l_entry; | |
0200214b RM |
517 | } |
518 | else | |
519 | { | |
520 | /* Create a link_map for the executable itself. | |
521 | This will be what dlopen on "" returns. */ | |
87c812c2 | 522 | _dl_new_object ((char *) "", "", lt_executable, NULL); |
be935610 | 523 | if (_dl_loaded == NULL) |
35fc382a | 524 | _dl_fatal_printf ("cannot allocate memory for link map\n"); |
be935610 | 525 | _dl_loaded->l_phdr = phdr; |
72f70279 | 526 | _dl_loaded->l_phnum = phnum; |
be935610 | 527 | _dl_loaded->l_entry = *user_entry; |
da832465 | 528 | |
61e0617a UD |
529 | /* At this point we are in a bit of trouble. We would have to |
530 | fill in the values for l_dev and l_ino. But in general we | |
531 | do not know where the file is. We also do not handle AT_EXECFD | |
532 | even if it would be passed up. | |
533 | ||
534 | We leave the values here defined to 0. This is normally no | |
535 | problem as the program code itself is normally no shared | |
536 | object and therefore cannot be loaded dynamically. Nothing | |
537 | prevent the use of dynamic binaries and in these situations | |
538 | we might get problems. We might not be able to find out | |
539 | whether the object is already loaded. But since there is no | |
540 | easy way out and because the dynamic binary must also not | |
541 | have an SONAME we ignore this program for now. If it becomes | |
542 | a problem we can force people using SONAMEs. */ | |
543 | ||
97a51d8a UD |
544 | /* We delay initializing the path structure until we got the dynamic |
545 | information for the program. */ | |
0200214b RM |
546 | } |
547 | ||
2373b30e | 548 | _dl_loaded->l_map_end = 0; |
052b6a6c | 549 | /* Perhaps the executable has no PT_LOAD header entries at all. */ |
be935610 | 550 | _dl_loaded->l_map_start = ~0; |
052b6a6c | 551 | |
0200214b | 552 | /* Scan the program header table for the dynamic section. */ |
72f70279 | 553 | for (ph = phdr; ph < &phdr[phnum]; ++ph) |
0200214b RM |
554 | switch (ph->p_type) |
555 | { | |
da832465 UD |
556 | case PT_PHDR: |
557 | /* Find out the load address. */ | |
be935610 | 558 | _dl_loaded->l_addr = (ElfW(Addr)) phdr - ph->p_vaddr; |
da832465 | 559 | break; |
0200214b RM |
560 | case PT_DYNAMIC: |
561 | /* This tells us where to find the dynamic section, | |
562 | which tells us everything we need to do. */ | |
be935610 | 563 | _dl_loaded->l_ld = (void *) _dl_loaded->l_addr + ph->p_vaddr; |
0200214b RM |
564 | break; |
565 | case PT_INTERP: | |
566 | /* This "interpreter segment" was used by the program loader to | |
567 | find the program interpreter, which is this program itself, the | |
568 | dynamic linker. We note what name finds us, so that a future | |
569 | dlopen call or DT_NEEDED entry, for something that wants to link | |
570 | against the dynamic linker as a shared library, will know that | |
571 | the shared object is already loaded. */ | |
be935610 UD |
572 | _dl_rtld_libname.name = ((const char *) _dl_loaded->l_addr |
573 | + ph->p_vaddr); | |
752a2a50 | 574 | /* _dl_rtld_libname.next = NULL; Already zero. */ |
c84142e8 | 575 | _dl_rtld_map.l_libname = &_dl_rtld_libname; |
f41c8091 UD |
576 | |
577 | /* Ordinarilly, we would get additional names for the loader from | |
578 | our DT_SONAME. This can't happen if we were actually linked as | |
579 | a static executable (detect this case when we have no DYNAMIC). | |
580 | If so, assume the filename component of the interpreter path to | |
581 | be our SONAME, and add it to our name list. */ | |
582 | if (_dl_rtld_map.l_ld == NULL) | |
583 | { | |
584 | char *p = strrchr (_dl_rtld_libname.name, '/'); | |
585 | if (p) | |
586 | { | |
587 | _dl_rtld_libname2.name = p+1; | |
752a2a50 | 588 | /* _dl_rtld_libname2.next = NULL; Already zero. */ |
f41c8091 UD |
589 | _dl_rtld_libname.next = &_dl_rtld_libname2; |
590 | } | |
591 | } | |
592 | ||
2f6d1f1b | 593 | has_interp = 1; |
0200214b | 594 | break; |
052b6a6c | 595 | case PT_LOAD: |
052b6a6c UD |
596 | { |
597 | ElfW(Addr) mapstart; | |
2373b30e UD |
598 | ElfW(Addr) allocend; |
599 | ||
600 | /* Remember where the main program starts in memory. */ | |
be935610 UD |
601 | mapstart = _dl_loaded->l_addr + (ph->p_vaddr & ~(ph->p_align - 1)); |
602 | if (_dl_loaded->l_map_start > mapstart) | |
603 | _dl_loaded->l_map_start = mapstart; | |
2373b30e UD |
604 | |
605 | /* Also where it ends. */ | |
606 | allocend = _dl_loaded->l_addr + ph->p_vaddr + ph->p_memsz; | |
607 | if (_dl_loaded->l_map_end < allocend) | |
608 | _dl_loaded->l_map_end = allocend; | |
052b6a6c UD |
609 | } |
610 | break; | |
0200214b | 611 | } |
2373b30e UD |
612 | if (! _dl_loaded->l_map_end) |
613 | _dl_loaded->l_map_end = ~0; | |
ffee1316 | 614 | if (! _dl_rtld_map.l_libname && _dl_rtld_map.l_name) |
c84142e8 UD |
615 | { |
616 | /* We were invoked directly, so the program might not have a | |
617 | PT_INTERP. */ | |
618 | _dl_rtld_libname.name = _dl_rtld_map.l_name; | |
752a2a50 | 619 | /* _dl_rtld_libname.next = NULL; Alread zero. */ |
c84142e8 UD |
620 | _dl_rtld_map.l_libname = &_dl_rtld_libname; |
621 | } | |
ffee1316 RM |
622 | else |
623 | assert (_dl_rtld_map.l_libname); /* How else did we get here? */ | |
0200214b | 624 | |
9a51759b UD |
625 | if (! rtld_is_main) |
626 | { | |
627 | /* Extract the contents of the dynamic section for easy access. */ | |
d3ac2d47 | 628 | elf_get_dynamic_info (_dl_loaded); |
9a51759b UD |
629 | if (_dl_loaded->l_info[DT_HASH]) |
630 | /* Set up our cache of pointers into the hash table. */ | |
631 | _dl_setup_hash (_dl_loaded); | |
632 | } | |
0200214b | 633 | |
9a821cf9 | 634 | if (__builtin_expect (mode, normal) == verify) |
e2102c14 UD |
635 | { |
636 | /* We were called just to verify that this is a dynamic | |
637 | executable using us as the program interpreter. Exit with an | |
638 | error if we were not able to load the binary or no interpreter | |
639 | is specified (i.e., this is no dynamically linked binary. */ | |
be935610 | 640 | if (_dl_loaded->l_ld == NULL) |
e2102c14 | 641 | _exit (1); |
e2102c14 UD |
642 | |
643 | /* We allow here some platform specific code. */ | |
644 | #ifdef DISTINGUISH_LIB_VERSIONS | |
645 | DISTINGUISH_LIB_VERSIONS; | |
646 | #endif | |
eb406346 | 647 | _exit (has_interp ? 0 : 2); |
e2102c14 UD |
648 | } |
649 | ||
9a51759b | 650 | if (! rtld_is_main) |
97a51d8a UD |
651 | /* Initialize the data structures for the search paths for shared |
652 | objects. */ | |
120b4c49 | 653 | _dl_init_paths (library_path); |
97a51d8a | 654 | |
0200214b | 655 | /* Put the link_map for ourselves on the chain so it can be found by |
ceb2d9aa | 656 | name. Note that at this point the global chain of link maps contains |
be935610 | 657 | exactly one element, which is pointed to by _dl_loaded. */ |
ffee1316 RM |
658 | if (! _dl_rtld_map.l_name) |
659 | /* If not invoked directly, the dynamic linker shared object file was | |
660 | found by the PT_INTERP name. */ | |
c84142e8 | 661 | _dl_rtld_map.l_name = (char *) _dl_rtld_map.l_libname->name; |
ba79d61b | 662 | _dl_rtld_map.l_type = lt_library; |
be935610 UD |
663 | _dl_loaded->l_next = &_dl_rtld_map; |
664 | _dl_rtld_map.l_prev = _dl_loaded; | |
1ebba33e | 665 | ++_dl_nloaded; |
0200214b | 666 | |
14bab8de | 667 | /* We have two ways to specify objects to preload: via environment |
49c091e5 | 668 | variable and via the file /etc/ld.so.preload. The latter can also |
14bab8de | 669 | be used when security is enabled. */ |
2064087b RM |
670 | preloads = NULL; |
671 | npreloads = 0; | |
14bab8de | 672 | |
db33f7d4 | 673 | if (__builtin_expect (preloadlist != NULL, 0)) |
c4029823 | 674 | { |
566efee2 UD |
675 | /* The LD_PRELOAD environment variable gives list of libraries |
676 | separated by white space or colons that are loaded before the | |
fd26970f UD |
677 | executable's dependencies and prepended to the global scope |
678 | list. If the binary is running setuid all elements | |
679 | containing a '/' are ignored since it is insecure. */ | |
680 | char *list = strdupa (preloadlist); | |
681 | char *p; | |
db276fa1 UD |
682 | |
683 | HP_TIMING_NOW (start); | |
684 | ||
566efee2 | 685 | while ((p = strsep (&list, " :")) != NULL) |
e2102c14 | 686 | if (p[0] != '\0' |
db33f7d4 UD |
687 | && (__builtin_expect (! __libc_enable_secure, 1) |
688 | || strchr (p, '/') == NULL)) | |
fd26970f | 689 | { |
be935610 | 690 | struct link_map *new_map = _dl_map_object (_dl_loaded, p, 1, |
bf8b3e74 | 691 | lt_library, 0, 0); |
42c4f32a | 692 | if (++new_map->l_opencount == 1) |
bd355af0 UD |
693 | /* It is no duplicate. */ |
694 | ++npreloads; | |
fd26970f | 695 | } |
db276fa1 UD |
696 | |
697 | HP_TIMING_NOW (stop); | |
698 | HP_TIMING_DIFF (diff, start, stop); | |
699 | HP_TIMING_ACCUM_NT (load_time, diff); | |
c4029823 UD |
700 | } |
701 | ||
14bab8de UD |
702 | /* Read the contents of the file. */ |
703 | file = _dl_sysdep_read_whole_file ("/etc/ld.so.preload", &file_size, | |
704 | PROT_READ | PROT_WRITE); | |
db33f7d4 | 705 | if (__builtin_expect (file != NULL, 0)) |
14bab8de UD |
706 | { |
707 | /* Parse the file. It contains names of libraries to be loaded, | |
708 | separated by white spaces or `:'. It may also contain | |
709 | comments introduced by `#'. */ | |
710 | char *problem; | |
711 | char *runp; | |
712 | size_t rest; | |
713 | ||
714 | /* Eliminate comments. */ | |
715 | runp = file; | |
716 | rest = file_size; | |
717 | while (rest > 0) | |
718 | { | |
719 | char *comment = memchr (runp, '#', rest); | |
720 | if (comment == NULL) | |
721 | break; | |
722 | ||
723 | rest -= comment - runp; | |
724 | do | |
725 | *comment = ' '; | |
726 | while (--rest > 0 && *++comment != '\n'); | |
727 | } | |
728 | ||
729 | /* We have one problematic case: if we have a name at the end of | |
730 | the file without a trailing terminating characters, we cannot | |
731 | place the \0. Handle the case separately. */ | |
49891c10 UD |
732 | if (file[file_size - 1] != ' ' && file[file_size - 1] != '\t' |
733 | && file[file_size - 1] != '\n' && file[file_size - 1] != ':') | |
14bab8de UD |
734 | { |
735 | problem = &file[file_size]; | |
736 | while (problem > file && problem[-1] != ' ' && problem[-1] != '\t' | |
49891c10 | 737 | && problem[-1] != '\n' && problem[-1] != ':') |
14bab8de UD |
738 | --problem; |
739 | ||
740 | if (problem > file) | |
741 | problem[-1] = '\0'; | |
742 | } | |
743 | else | |
49891c10 UD |
744 | { |
745 | problem = NULL; | |
746 | file[file_size - 1] = '\0'; | |
747 | } | |
14bab8de | 748 | |
db276fa1 UD |
749 | HP_TIMING_NOW (start); |
750 | ||
14bab8de UD |
751 | if (file != problem) |
752 | { | |
753 | char *p; | |
e2102c14 | 754 | runp = file; |
14bab8de | 755 | while ((p = strsep (&runp, ": \t\n")) != NULL) |
e2102c14 UD |
756 | if (p[0] != '\0') |
757 | { | |
be935610 | 758 | struct link_map *new_map = _dl_map_object (_dl_loaded, p, 1, |
bf8b3e74 | 759 | lt_library, 0, 0); |
42c4f32a | 760 | if (++new_map->l_opencount == 1) |
e2102c14 UD |
761 | /* It is no duplicate. */ |
762 | ++npreloads; | |
763 | } | |
14bab8de UD |
764 | } |
765 | ||
766 | if (problem != NULL) | |
767 | { | |
768 | char *p = strndupa (problem, file_size - (problem - file)); | |
be935610 | 769 | struct link_map *new_map = _dl_map_object (_dl_loaded, p, 1, |
bf8b3e74 | 770 | lt_library, 0, 0); |
42c4f32a | 771 | if (++new_map->l_opencount == 1) |
bd355af0 UD |
772 | /* It is no duplicate. */ |
773 | ++npreloads; | |
14bab8de UD |
774 | } |
775 | ||
db276fa1 UD |
776 | HP_TIMING_NOW (stop); |
777 | HP_TIMING_DIFF (diff, start, stop); | |
778 | HP_TIMING_ACCUM_NT (load_time, diff); | |
779 | ||
14bab8de UD |
780 | /* We don't need the file anymore. */ |
781 | __munmap (file, file_size); | |
782 | } | |
783 | ||
db33f7d4 | 784 | if (__builtin_expect (npreloads, 0) != 0) |
14bab8de UD |
785 | { |
786 | /* Set up PRELOADS with a vector of the preloaded libraries. */ | |
787 | struct link_map *l; | |
14bab8de UD |
788 | preloads = __alloca (npreloads * sizeof preloads[0]); |
789 | l = _dl_rtld_map.l_next; /* End of the chain before preloads. */ | |
790 | i = 0; | |
791 | do | |
792 | { | |
793 | preloads[i++] = l; | |
794 | l = l->l_next; | |
795 | } while (l); | |
796 | assert (i == npreloads); | |
797 | } | |
798 | ||
2064087b RM |
799 | /* Load all the libraries specified by DT_NEEDED entries. If LD_PRELOAD |
800 | specified some libraries to load, these are inserted before the actual | |
801 | dependencies in the executable's searchlist for symbol resolution. */ | |
db276fa1 | 802 | HP_TIMING_NOW (start); |
d9cb1a7d | 803 | _dl_map_object_deps (_dl_loaded, preloads, npreloads, mode == trace); |
db276fa1 UD |
804 | HP_TIMING_NOW (stop); |
805 | HP_TIMING_DIFF (diff, start, stop); | |
806 | HP_TIMING_ACCUM_NT (load_time, diff); | |
e3e35cfc | 807 | |
42c4f32a UD |
808 | /* Mark all objects as being in the global scope and set the open |
809 | counter. */ | |
e3e35cfc | 810 | for (i = _dl_loaded->l_searchlist.r_nlist; i > 0; ) |
42c4f32a UD |
811 | { |
812 | --i; | |
813 | _dl_loaded->l_searchlist.r_list[i]->l_global = 1; | |
814 | ++_dl_loaded->l_searchlist.r_list[i]->l_opencount; | |
815 | } | |
d66e34cd | 816 | |
2064087b | 817 | #ifndef MAP_ANON |
f332db02 RM |
818 | /* We are done mapping things, so close the zero-fill descriptor. */ |
819 | __close (_dl_zerofd); | |
820 | _dl_zerofd = -1; | |
2064087b | 821 | #endif |
f332db02 | 822 | |
f9496a7b RM |
823 | /* Remove _dl_rtld_map from the chain. */ |
824 | _dl_rtld_map.l_prev->l_next = _dl_rtld_map.l_next; | |
825 | if (_dl_rtld_map.l_next) | |
826 | _dl_rtld_map.l_next->l_prev = _dl_rtld_map.l_prev; | |
827 | ||
c2a714f3 | 828 | if (__builtin_expect (_dl_rtld_map.l_opencount > 1, 1)) |
0200214b | 829 | { |
f9496a7b RM |
830 | /* Some DT_NEEDED entry referred to the interpreter object itself, so |
831 | put it back in the list of visible objects. We insert it into the | |
832 | chain in symbol search order because gdb uses the chain's order as | |
833 | its symbol search order. */ | |
77aba05b | 834 | i = 1; |
be935610 | 835 | while (_dl_loaded->l_searchlist.r_list[i] != &_dl_rtld_map) |
f9496a7b | 836 | ++i; |
be935610 | 837 | _dl_rtld_map.l_prev = _dl_loaded->l_searchlist.r_list[i - 1]; |
b2bcd61a UD |
838 | if (__builtin_expect (mode, normal) == normal) |
839 | _dl_rtld_map.l_next = (i + 1 < _dl_loaded->l_searchlist.r_nlist | |
840 | ? _dl_loaded->l_searchlist.r_list[i + 1] | |
841 | : NULL); | |
842 | else | |
843 | /* In trace mode there might be an invisible object (which we | |
844 | could not find) after the previous one in the search list. | |
845 | In this case it doesn't matter much where we put the | |
846 | interpreter object, so we just initialize the list pointer so | |
847 | that the assertion below holds. */ | |
848 | _dl_rtld_map.l_next = _dl_rtld_map.l_prev->l_next; | |
849 | ||
f9496a7b RM |
850 | assert (_dl_rtld_map.l_prev->l_next == _dl_rtld_map.l_next); |
851 | _dl_rtld_map.l_prev->l_next = &_dl_rtld_map; | |
4d02a5b1 | 852 | if (_dl_rtld_map.l_next) |
f9496a7b RM |
853 | { |
854 | assert (_dl_rtld_map.l_next->l_prev == _dl_rtld_map.l_prev); | |
855 | _dl_rtld_map.l_next->l_prev = &_dl_rtld_map; | |
856 | } | |
0200214b | 857 | } |
d66e34cd | 858 | |
c84142e8 UD |
859 | /* Now let us see whether all libraries are available in the |
860 | versions we need. */ | |
861 | { | |
993b3242 UD |
862 | struct version_check_args args; |
863 | args.doexit = mode == normal; | |
145b8413 | 864 | args.dotrace = mode == trace; |
993b3242 | 865 | _dl_receive_error (print_missing_version, version_check_doit, &args); |
c84142e8 UD |
866 | } |
867 | ||
9a821cf9 | 868 | if (__builtin_expect (mode, normal) != normal) |
0200214b RM |
869 | { |
870 | /* We were run just to list the shared libraries. It is | |
871 | important that we do this before real relocation, because the | |
872 | functions we call below for output may no longer work properly | |
873 | after relocation. */ | |
0200214b | 874 | if (! _dl_loaded->l_info[DT_NEEDED]) |
35fc382a | 875 | _dl_printf ("\tstatically linked\n"); |
0200214b | 876 | else |
ceb2d9aa UD |
877 | { |
878 | struct link_map *l; | |
879 | ||
880 | for (l = _dl_loaded->l_next; l; l = l->l_next) | |
a881e0a0 | 881 | if (l->l_faked) |
ceb2d9aa | 882 | /* The library was not found. */ |
35fc382a | 883 | _dl_printf ("\t%s => not found\n", l->l_libname->name); |
ceb2d9aa | 884 | else |
35fc382a | 885 | _dl_printf ("\t%s => %s (0x%0*Zx)\n", l->l_libname->name, |
8a0746ae | 886 | l->l_name, (int) sizeof l->l_addr * 2, l->l_addr); |
ceb2d9aa | 887 | } |
1a3a58fd | 888 | |
9a821cf9 | 889 | if (__builtin_expect (mode, trace) != trace) |
cddcfecf RM |
890 | for (i = 1; i < _dl_argc; ++i) |
891 | { | |
892 | const ElfW(Sym) *ref = NULL; | |
c0282c06 UD |
893 | ElfW(Addr) loadbase; |
894 | lookup_t result; | |
c0282c06 UD |
895 | |
896 | result = _dl_lookup_symbol (_dl_argv[i], _dl_loaded, | |
897 | &ref, _dl_loaded->l_scope, | |
967cdc10 | 898 | ELF_RTYPE_CLASS_PLT, 1); |
c0282c06 UD |
899 | |
900 | loadbase = LOOKUP_VALUE_ADDRESS (result); | |
901 | ||
35fc382a | 902 | _dl_printf ("%s found at 0x%0*Zd in object at 0x%0*Zd\n", |
8a0746ae RM |
903 | _dl_argv[i], |
904 | (int) sizeof ref->st_value * 2, ref->st_value, | |
905 | (int) sizeof loadbase * 2, loadbase); | |
cddcfecf | 906 | } |
ce37fa88 | 907 | else |
fd26970f | 908 | { |
667b0577 UD |
909 | /* If LD_WARN is set warn about undefined symbols. */ |
910 | if (_dl_lazy >= 0 && _dl_verbose) | |
ce37fa88 UD |
911 | { |
912 | /* We have to do symbol dependency testing. */ | |
913 | struct relocate_args args; | |
914 | struct link_map *l; | |
993b3242 | 915 | |
12b5b6b7 | 916 | args.lazy = _dl_lazy; |
fd26970f | 917 | |
ce37fa88 UD |
918 | l = _dl_loaded; |
919 | while (l->l_next) | |
920 | l = l->l_next; | |
921 | do | |
922 | { | |
a881e0a0 | 923 | if (l != &_dl_rtld_map && ! l->l_faked) |
ce37fa88 UD |
924 | { |
925 | args.l = l; | |
926 | _dl_receive_error (print_unresolved, relocate_doit, | |
927 | &args); | |
ce37fa88 UD |
928 | } |
929 | l = l->l_prev; | |
930 | } while (l); | |
931 | } | |
932 | ||
b0982c4a | 933 | #define VERNEEDTAG (DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGIDX (DT_VERNEED)) |
120b4c49 | 934 | if (version_info) |
fd26970f | 935 | { |
ce37fa88 UD |
936 | /* Print more information. This means here, print information |
937 | about the versions needed. */ | |
938 | int first = 1; | |
939 | struct link_map *map = _dl_loaded; | |
940 | ||
941 | for (map = _dl_loaded; map != NULL; map = map->l_next) | |
fd26970f | 942 | { |
f41c8091 | 943 | const char *strtab; |
ce37fa88 | 944 | ElfW(Dyn) *dyn = map->l_info[VERNEEDTAG]; |
f41c8091 UD |
945 | ElfW(Verneed) *ent; |
946 | ||
947 | if (dyn == NULL) | |
948 | continue; | |
949 | ||
a42195db | 950 | strtab = (const void *) D_PTR (map, l_info[DT_STRTAB]); |
f41c8091 | 951 | ent = (ElfW(Verneed) *) (map->l_addr + dyn->d_un.d_ptr); |
ce37fa88 | 952 | |
f41c8091 | 953 | if (first) |
ce37fa88 | 954 | { |
35fc382a | 955 | _dl_printf ("\n\tVersion information:\n"); |
f41c8091 UD |
956 | first = 0; |
957 | } | |
ce37fa88 | 958 | |
35fc382a UD |
959 | _dl_printf ("\t%s:\n", |
960 | map->l_name[0] ? map->l_name : _dl_argv[0]); | |
f41c8091 UD |
961 | |
962 | while (1) | |
963 | { | |
964 | ElfW(Vernaux) *aux; | |
965 | struct link_map *needed; | |
ce37fa88 | 966 | |
f41c8091 UD |
967 | needed = find_needed (strtab + ent->vn_file); |
968 | aux = (ElfW(Vernaux) *) ((char *) ent + ent->vn_aux); | |
ce37fa88 UD |
969 | |
970 | while (1) | |
971 | { | |
f41c8091 UD |
972 | const char *fname = NULL; |
973 | ||
f41c8091 | 974 | if (needed != NULL |
ba9fcb3f UD |
975 | && match_version (strtab + aux->vna_name, |
976 | needed)) | |
f41c8091 UD |
977 | fname = needed->l_name; |
978 | ||
35fc382a UD |
979 | _dl_printf ("\t\t%s (%s) %s=> %s\n", |
980 | strtab + ent->vn_file, | |
981 | strtab + aux->vna_name, | |
982 | aux->vna_flags & VER_FLG_WEAK | |
983 | ? "[WEAK] " : "", | |
984 | fname ?: "not found"); | |
ce37fa88 | 985 | |
f41c8091 UD |
986 | if (aux->vna_next == 0) |
987 | /* No more symbols. */ | |
ce37fa88 UD |
988 | break; |
989 | ||
f41c8091 UD |
990 | /* Next symbol. */ |
991 | aux = (ElfW(Vernaux) *) ((char *) aux | |
992 | + aux->vna_next); | |
ce37fa88 | 993 | } |
f41c8091 UD |
994 | |
995 | if (ent->vn_next == 0) | |
996 | /* No more dependencies. */ | |
997 | break; | |
998 | ||
999 | /* Next dependency. */ | |
1000 | ent = (ElfW(Verneed) *) ((char *) ent + ent->vn_next); | |
ce37fa88 | 1001 | } |
fd26970f | 1002 | } |
ce37fa88 | 1003 | } |
fd26970f | 1004 | } |
d66e34cd | 1005 | |
0200214b RM |
1006 | _exit (0); |
1007 | } | |
86d2c878 | 1008 | |
ba79d61b RM |
1009 | { |
1010 | /* Now we have all the objects loaded. Relocate them all except for | |
1011 | the dynamic linker itself. We do this in reverse order so that copy | |
1012 | relocs of earlier objects overwrite the data written by later | |
1013 | objects. We do not re-relocate the dynamic linker itself in this | |
1014 | loop because that could result in the GOT entries for functions we | |
1015 | call being changed, and that would break us. It is safe to relocate | |
1016 | the dynamic linker out of order because it has no copy relocs (we | |
1017 | know that because it is self-contained). */ | |
1018 | ||
ceb2d9aa | 1019 | struct link_map *l; |
c0fb8a56 | 1020 | int consider_profiling = _dl_profile != NULL; |
8b07d6a8 | 1021 | #ifndef HP_TIMING_NONAVAIL |
db276fa1 UD |
1022 | hp_timing_t start; |
1023 | hp_timing_t stop; | |
1024 | hp_timing_t add; | |
8b07d6a8 | 1025 | #endif |
c0fb8a56 UD |
1026 | |
1027 | /* If we are profiling we also must do lazy reloaction. */ | |
12b5b6b7 | 1028 | _dl_lazy |= consider_profiling; |
c0fb8a56 | 1029 | |
ba79d61b RM |
1030 | l = _dl_loaded; |
1031 | while (l->l_next) | |
1032 | l = l->l_next; | |
db276fa1 UD |
1033 | |
1034 | HP_TIMING_NOW (start); | |
ba79d61b RM |
1035 | do |
1036 | { | |
752a2a50 UD |
1037 | /* While we are at it, help the memory handling a bit. We have to |
1038 | mark some data structures as allocated with the fake malloc() | |
1039 | implementation in ld.so. */ | |
1040 | struct libname_list *lnp = l->l_libname->next; | |
1041 | ||
1042 | while (__builtin_expect (lnp != NULL, 0)) | |
1043 | { | |
1044 | lnp->dont_free = 1; | |
1045 | lnp = lnp->next; | |
1046 | } | |
1047 | ||
ba79d61b | 1048 | if (l != &_dl_rtld_map) |
12b5b6b7 | 1049 | _dl_relocate_object (l, l->l_scope, _dl_lazy, consider_profiling); |
be935610 | 1050 | |
ba79d61b | 1051 | l = l->l_prev; |
db276fa1 UD |
1052 | } |
1053 | while (l); | |
1054 | HP_TIMING_NOW (stop); | |
1055 | ||
1056 | HP_TIMING_DIFF (relocate_time, start, stop); | |
ba79d61b RM |
1057 | |
1058 | /* Do any necessary cleanups for the startup OS interface code. | |
1059 | We do these now so that no calls are made after rtld re-relocation | |
1060 | which might be resolved to different functions than we expect. | |
1061 | We cannot do this before relocating the other objects because | |
1062 | _dl_relocate_object might need to call `mprotect' for DT_TEXTREL. */ | |
1063 | _dl_sysdep_start_cleanup (); | |
1064 | ||
722c33bb UD |
1065 | /* Now enable profiling if needed. Like the previous call, |
1066 | this has to go here because the calls it makes should use the | |
1067 | rtld versions of the functions (particularly calloc()), but it | |
1068 | needs to have _dl_profile_map set up by the relocator. */ | |
db33f7d4 | 1069 | if (__builtin_expect (_dl_profile_map != NULL, 0)) |
722c33bb UD |
1070 | /* We must prepare the profiling. */ |
1071 | _dl_start_profile (_dl_profile_map, _dl_profile_output); | |
1072 | ||
1ca7cbcb | 1073 | if (_dl_rtld_map.l_opencount > 1) |
db276fa1 UD |
1074 | { |
1075 | /* There was an explicit ref to the dynamic linker as a shared lib. | |
1076 | Re-relocate ourselves with user-controlled symbol definitions. */ | |
1077 | HP_TIMING_NOW (start); | |
1078 | _dl_relocate_object (&_dl_rtld_map, _dl_loaded->l_scope, 0, 0); | |
1079 | HP_TIMING_NOW (stop); | |
1080 | HP_TIMING_DIFF (add, start, stop); | |
1081 | HP_TIMING_ACCUM_NT (relocate_time, add); | |
1082 | } | |
ba79d61b | 1083 | } |
ac16e905 | 1084 | |
be935610 UD |
1085 | /* Now set up the variable which helps the assembler startup code. */ |
1086 | _dl_main_searchlist = &_dl_loaded->l_searchlist; | |
1087 | _dl_global_scope[0] = &_dl_loaded->l_searchlist; | |
1088 | ||
604510f7 UD |
1089 | /* Safe the information about the original global scope list since |
1090 | we need it in the memory handling later. */ | |
1091 | _dl_initial_searchlist = *_dl_main_searchlist; | |
1092 | ||
4d6acc61 RM |
1093 | { |
1094 | /* Initialize _r_debug. */ | |
1095 | struct r_debug *r = _dl_debug_initialize (_dl_rtld_map.l_addr); | |
ceb2d9aa | 1096 | struct link_map *l; |
4d6acc61 RM |
1097 | |
1098 | l = _dl_loaded; | |
ec42724d RM |
1099 | |
1100 | #ifdef ELF_MACHINE_DEBUG_SETUP | |
1101 | ||
1102 | /* Some machines (e.g. MIPS) don't use DT_DEBUG in this way. */ | |
1103 | ||
1104 | ELF_MACHINE_DEBUG_SETUP (l, r); | |
1105 | ELF_MACHINE_DEBUG_SETUP (&_dl_rtld_map, r); | |
1106 | ||
1107 | #else | |
1108 | ||
4d6acc61 RM |
1109 | if (l->l_info[DT_DEBUG]) |
1110 | /* There is a DT_DEBUG entry in the dynamic section. Fill it in | |
1111 | with the run-time address of the r_debug structure */ | |
1112 | l->l_info[DT_DEBUG]->d_un.d_ptr = (ElfW(Addr)) r; | |
1113 | ||
d746b89c RM |
1114 | /* Fill in the pointer in the dynamic linker's own dynamic section, in |
1115 | case you run gdb on the dynamic linker directly. */ | |
1116 | if (_dl_rtld_map.l_info[DT_DEBUG]) | |
1117 | _dl_rtld_map.l_info[DT_DEBUG]->d_un.d_ptr = (ElfW(Addr)) r; | |
1118 | ||
ec42724d RM |
1119 | #endif |
1120 | ||
4d6acc61 RM |
1121 | /* Notify the debugger that all objects are now mapped in. */ |
1122 | r->r_state = RT_ADD; | |
1123 | _dl_debug_state (); | |
1124 | } | |
0200214b | 1125 | |
08cac4ac UD |
1126 | #ifndef MAP_COPY |
1127 | /* We must munmap() the cache file. */ | |
1128 | _dl_unload_cache (); | |
1129 | #endif | |
1130 | ||
d66e34cd RM |
1131 | /* Once we return, _dl_sysdep_start will invoke |
1132 | the DT_INIT functions and then *USER_ENTRY. */ | |
1133 | } | |
fd26970f UD |
1134 | \f |
1135 | /* This is a little helper function for resolving symbols while | |
1136 | tracing the binary. */ | |
1137 | static void | |
c84142e8 UD |
1138 | print_unresolved (int errcode __attribute__ ((unused)), const char *objname, |
1139 | const char *errstring) | |
fd26970f | 1140 | { |
3996f34b UD |
1141 | if (objname[0] == '\0') |
1142 | objname = _dl_argv[0] ?: "<main program>"; | |
35fc382a | 1143 | _dl_error_printf ("%s (%s)\n", errstring, objname); |
fd26970f | 1144 | } |
c84142e8 UD |
1145 | \f |
1146 | /* This is a little helper function for resolving symbols while | |
1147 | tracing the binary. */ | |
1148 | static void | |
1149 | print_missing_version (int errcode __attribute__ ((unused)), | |
1150 | const char *objname, const char *errstring) | |
1151 | { | |
35fc382a UD |
1152 | _dl_error_printf ("%s: %s: %s\n", _dl_argv[0] ?: "<program name unknown>", |
1153 | objname, errstring); | |
c84142e8 | 1154 | } |
ea278354 | 1155 | \f |
7dea968e UD |
1156 | /* Nonzero if any of the debugging options is enabled. */ |
1157 | static int any_debug; | |
1158 | ||
b5efde2f UD |
1159 | /* Process the string given as the parameter which explains which debugging |
1160 | options are enabled. */ | |
1161 | static void | |
14c44e2e | 1162 | process_dl_debug (const char *dl_debug) |
b5efde2f | 1163 | { |
14c44e2e UD |
1164 | size_t len; |
1165 | #define separators " ,:" | |
b5efde2f UD |
1166 | do |
1167 | { | |
14c44e2e | 1168 | len = 0; |
b5efde2f | 1169 | /* Skip separating white spaces and commas. */ |
14c44e2e | 1170 | dl_debug += strspn (dl_debug, separators); |
b5efde2f UD |
1171 | if (*dl_debug != '\0') |
1172 | { | |
14c44e2e UD |
1173 | len = strcspn (dl_debug, separators); |
1174 | ||
1175 | switch (len) | |
b5efde2f | 1176 | { |
b0b67c47 UD |
1177 | case 3: |
1178 | /* This option is not documented since it is not generally | |
1179 | useful. */ | |
1180 | if (memcmp (dl_debug, "all", 3) == 0) | |
1181 | { | |
62dcee57 UD |
1182 | _dl_debug_mask = (DL_DEBUG_LIBS | DL_DEBUG_IMPCALLS |
1183 | | DL_DEBUG_RELOC | DL_DEBUG_FILES | |
1184 | | DL_DEBUG_SYMBOLS | DL_DEBUG_BINDINGS | |
1185 | | DL_DEBUG_VERSIONS); | |
b0b67c47 | 1186 | any_debug = 1; |
ceb27555 | 1187 | continue; |
b0b67c47 UD |
1188 | } |
1189 | break; | |
1190 | ||
14c44e2e UD |
1191 | case 4: |
1192 | if (memcmp (dl_debug, "help", 4) == 0) | |
1193 | { | |
35fc382a | 1194 | _dl_printf ("\ |
08b511e6 | 1195 | Valid options for the LD_DEBUG environment variable are:\n\ |
b5efde2f | 1196 | \n\ |
5732c4df UD |
1197 | bindings display information about symbol binding\n\ |
1198 | files display processing of files and libraries\n\ | |
1199 | help display this help message and exit\n\ | |
1200 | libs display library search paths\n\ | |
dc911631 UD |
1201 | reloc display relocation processing\n\ |
1202 | statistics display relocation statistics\n\ | |
1203 | symbols display symbol table processing\n\ | |
5732c4df | 1204 | versions display version dependencies\n\ |
0c367d92 UD |
1205 | \n\ |
1206 | To direct the debugging output into a file instead of standard output\n\ | |
35fc382a | 1207 | a filename can be specified using the LD_DEBUG_OUTPUT environment variable.\n"); |
14c44e2e UD |
1208 | _exit (0); |
1209 | } | |
77aba05b | 1210 | |
14c44e2e UD |
1211 | if (memcmp (dl_debug, "libs", 4) == 0) |
1212 | { | |
62dcee57 | 1213 | _dl_debug_mask |= DL_DEBUG_LIBS | DL_DEBUG_IMPCALLS; |
14c44e2e UD |
1214 | any_debug = 1; |
1215 | continue; | |
1216 | } | |
1217 | break; | |
1218 | ||
1219 | case 5: | |
1220 | if (memcmp (dl_debug, "reloc", 5) == 0) | |
1221 | { | |
62dcee57 | 1222 | _dl_debug_mask |= DL_DEBUG_RELOC | DL_DEBUG_IMPCALLS; |
14c44e2e UD |
1223 | any_debug = 1; |
1224 | continue; | |
1225 | } | |
1226 | ||
1227 | if (memcmp (dl_debug, "files", 5) == 0) | |
1228 | { | |
62dcee57 | 1229 | _dl_debug_mask |= DL_DEBUG_FILES | DL_DEBUG_IMPCALLS; |
14c44e2e UD |
1230 | any_debug = 1; |
1231 | continue; | |
1232 | } | |
1233 | break; | |
77aba05b | 1234 | |
14c44e2e UD |
1235 | case 7: |
1236 | if (memcmp (dl_debug, "symbols", 7) == 0) | |
1237 | { | |
62dcee57 | 1238 | _dl_debug_mask |= DL_DEBUG_SYMBOLS | DL_DEBUG_IMPCALLS; |
14c44e2e UD |
1239 | any_debug = 1; |
1240 | continue; | |
1241 | } | |
1242 | break; | |
77aba05b | 1243 | |
14c44e2e UD |
1244 | case 8: |
1245 | if (memcmp (dl_debug, "bindings", 8) == 0) | |
1246 | { | |
62dcee57 | 1247 | _dl_debug_mask |= DL_DEBUG_BINDINGS | DL_DEBUG_IMPCALLS; |
14c44e2e UD |
1248 | any_debug = 1; |
1249 | continue; | |
1250 | } | |
1251 | ||
1252 | if (memcmp (dl_debug, "versions", 8) == 0) | |
1253 | { | |
62dcee57 | 1254 | _dl_debug_mask |= DL_DEBUG_VERSIONS | DL_DEBUG_IMPCALLS; |
14c44e2e UD |
1255 | any_debug = 1; |
1256 | continue; | |
1257 | } | |
1258 | break; | |
1259 | ||
db276fa1 UD |
1260 | case 10: |
1261 | if (memcmp (dl_debug, "statistics", 10) == 0) | |
1262 | { | |
62dcee57 | 1263 | _dl_debug_mask |= DL_DEBUG_STATISTICS; |
db276fa1 UD |
1264 | continue; |
1265 | } | |
1266 | break; | |
1267 | ||
14c44e2e UD |
1268 | default: |
1269 | break; | |
77aba05b | 1270 | } |
14c44e2e UD |
1271 | |
1272 | { | |
1273 | /* Display a warning and skip everything until next separator. */ | |
1274 | char *startp = strndupa (dl_debug, len); | |
35fc382a UD |
1275 | _dl_error_printf ("\ |
1276 | warning: debug option `%s' unknown; try LD_DEBUG=help\n", startp); | |
db276fa1 | 1277 | break; |
14c44e2e | 1278 | } |
b5efde2f UD |
1279 | } |
1280 | } | |
14c44e2e | 1281 | while (*(dl_debug += len) != '\0'); |
b5efde2f UD |
1282 | } |
1283 | \f | |
ea278354 UD |
1284 | /* Process all environments variables the dynamic linker must recognize. |
1285 | Since all of them start with `LD_' we are a bit smarter while finding | |
1286 | all the entries. */ | |
67c94753 UD |
1287 | extern char **_environ; |
1288 | ||
ea278354 | 1289 | static void |
ba9fcb3f | 1290 | process_envvars (enum mode *modep) |
ea278354 | 1291 | { |
67c94753 | 1292 | char **runp = _environ; |
ea278354 UD |
1293 | char *envline; |
1294 | enum mode mode = normal; | |
7dea968e | 1295 | char *debug_output = NULL; |
ea278354 UD |
1296 | |
1297 | /* This is the default place for profiling data file. */ | |
92effacf | 1298 | _dl_profile_output = __libc_enable_secure ? "/var/profile" : "/var/tmp"; |
ea278354 UD |
1299 | |
1300 | while ((envline = _dl_next_ld_env_entry (&runp)) != NULL) | |
1301 | { | |
75e8d1f5 | 1302 | size_t len = strcspn (envline, "="); |
ea278354 | 1303 | |
75e8d1f5 UD |
1304 | if (envline[len] != '=') |
1305 | /* This is a "LD_" variable at the end of the string without | |
1306 | a '=' character. Ignore it since otherwise we will access | |
1307 | invalid memory below. */ | |
67c94753 | 1308 | continue; |
75e8d1f5 | 1309 | |
67c94753 | 1310 | switch (len) |
ea278354 | 1311 | { |
14c44e2e UD |
1312 | case 4: |
1313 | /* Warning level, verbose or not. */ | |
67c94753 UD |
1314 | if (memcmp (envline, "WARN", 4) == 0) |
1315 | _dl_verbose = envline[5] != '\0'; | |
14c44e2e | 1316 | break; |
ea278354 | 1317 | |
14c44e2e UD |
1318 | case 5: |
1319 | /* Debugging of the dynamic linker? */ | |
67c94753 UD |
1320 | if (memcmp (envline, "DEBUG", 5) == 0) |
1321 | process_dl_debug (&envline[6]); | |
14c44e2e | 1322 | break; |
b5efde2f | 1323 | |
14c44e2e UD |
1324 | case 7: |
1325 | /* Print information about versions. */ | |
67c94753 | 1326 | if (memcmp (envline, "VERBOSE", 7) == 0) |
14c44e2e | 1327 | { |
67c94753 | 1328 | version_info = envline[8] != '\0'; |
14c44e2e UD |
1329 | break; |
1330 | } | |
7dea968e | 1331 | |
14c44e2e | 1332 | /* List of objects to be preloaded. */ |
67c94753 | 1333 | if (memcmp (envline, "PRELOAD", 7) == 0) |
14c44e2e | 1334 | { |
67c94753 | 1335 | preloadlist = &envline[8]; |
14c44e2e UD |
1336 | break; |
1337 | } | |
120b4c49 | 1338 | |
14c44e2e | 1339 | /* Which shared object shall be profiled. */ |
67c94753 UD |
1340 | if (memcmp (envline, "PROFILE", 7) == 0) |
1341 | _dl_profile = &envline[8]; | |
14c44e2e | 1342 | break; |
120b4c49 | 1343 | |
14c44e2e UD |
1344 | case 8: |
1345 | /* Do we bind early? */ | |
67c94753 | 1346 | if (memcmp (envline, "BIND_NOW", 8) == 0) |
f53c03c2 | 1347 | { |
67c94753 | 1348 | _dl_lazy = envline[9] == '\0'; |
f53c03c2 UD |
1349 | break; |
1350 | } | |
67c94753 UD |
1351 | if (memcmp (envline, "BIND_NOT", 8) == 0) |
1352 | _dl_bind_not = envline[9] != '\0'; | |
14c44e2e | 1353 | break; |
ea278354 | 1354 | |
14c44e2e UD |
1355 | case 9: |
1356 | /* Test whether we want to see the content of the auxiliary | |
1357 | array passed up from the kernel. */ | |
67c94753 | 1358 | if (memcmp (envline, "SHOW_AUXV", 9) == 0) |
14c44e2e UD |
1359 | _dl_show_auxv (); |
1360 | break; | |
ea278354 | 1361 | |
12264bd7 | 1362 | case 10: |
3081378b | 1363 | /* Mask for the important hardware capabilities. */ |
67c94753 UD |
1364 | if (memcmp (envline, "HWCAP_MASK", 10) == 0) |
1365 | _dl_hwcap_mask = __strtoul_internal (&envline[11], NULL, 0, 0); | |
12264bd7 UD |
1366 | break; |
1367 | ||
f787edde UD |
1368 | case 11: |
1369 | /* Path where the binary is found. */ | |
45769315 | 1370 | if (!__libc_enable_secure |
67c94753 UD |
1371 | && memcmp (envline, "ORIGIN_PATH", 11) == 0) |
1372 | _dl_origin_path = &envline[12]; | |
f787edde UD |
1373 | break; |
1374 | ||
14c44e2e | 1375 | case 12: |
dec126b4 | 1376 | /* The library search path. */ |
67c94753 | 1377 | if (memcmp (envline, "LIBRARY_PATH", 12) == 0) |
dec126b4 | 1378 | { |
67c94753 | 1379 | library_path = &envline[13]; |
dec126b4 UD |
1380 | break; |
1381 | } | |
1382 | ||
14c44e2e | 1383 | /* Where to place the profiling data file. */ |
67c94753 | 1384 | if (memcmp (envline, "DEBUG_OUTPUT", 12) == 0) |
14c44e2e | 1385 | { |
67c94753 | 1386 | debug_output = &envline[13]; |
14c44e2e UD |
1387 | break; |
1388 | } | |
ea278354 | 1389 | |
67c94753 | 1390 | if (memcmp (envline, "DYNAMIC_WEAK", 12) == 0) |
dec126b4 | 1391 | _dl_dynamic_weak = 1; |
14c44e2e | 1392 | break; |
ea278354 | 1393 | |
14c44e2e UD |
1394 | case 14: |
1395 | /* Where to place the profiling data file. */ | |
3081378b | 1396 | if (!__libc_enable_secure |
67c94753 | 1397 | && memcmp (envline, "PROFILE_OUTPUT", 14) == 0) |
14c44e2e | 1398 | { |
67c94753 | 1399 | _dl_profile_output = &envline[15]; |
14c44e2e UD |
1400 | if (*_dl_profile_output == '\0') |
1401 | _dl_profile_output = "/var/tmp"; | |
1402 | } | |
1403 | break; | |
120b4c49 | 1404 | |
14c44e2e UD |
1405 | case 20: |
1406 | /* The mode of the dynamic linker can be set. */ | |
67c94753 | 1407 | if (memcmp (envline, "TRACE_LOADED_OBJECTS", 20) == 0) |
14c44e2e UD |
1408 | mode = trace; |
1409 | break; | |
e2102c14 UD |
1410 | |
1411 | /* We might have some extra environment variable to handle. This | |
1412 | is tricky due to the pre-processing of the length of the name | |
1413 | in the switch statement here. The code here assumes that added | |
1414 | environment variables have a different length. */ | |
1415 | #ifdef EXTRA_LD_ENVVARS | |
1416 | EXTRA_LD_ENVVARS | |
1417 | #endif | |
ea278354 UD |
1418 | } |
1419 | } | |
1420 | ||
4bae5567 UD |
1421 | /* Extra security for SUID binaries. Remove all dangerous environment |
1422 | variables. */ | |
ba9fcb3f | 1423 | if (__builtin_expect (__libc_enable_secure, 0)) |
4bae5567 UD |
1424 | { |
1425 | static const char *unsecure_envvars[] = | |
1426 | { | |
74955460 | 1427 | UNSECURE_ENVVARS, |
4bae5567 UD |
1428 | #ifdef EXTRA_UNSECURE_ENVVARS |
1429 | EXTRA_UNSECURE_ENVVARS | |
1430 | #endif | |
1431 | }; | |
1432 | size_t cnt; | |
1433 | ||
1434 | if (preloadlist != NULL) | |
1435 | unsetenv ("LD_PRELOAD"); | |
1436 | if (library_path != NULL) | |
1437 | unsetenv ("LD_LIBRARY_PATH"); | |
722c33bb UD |
1438 | if (_dl_origin_path != NULL) |
1439 | unsetenv ("LD_ORIGIN_PATH"); | |
1440 | if (debug_output != NULL) | |
1441 | unsetenv ("LD_DEBUG_OUTPUT"); | |
1442 | if (_dl_profile != NULL) | |
1443 | unsetenv ("LD_PROFILE"); | |
4bae5567 UD |
1444 | |
1445 | for (cnt = 0; | |
1446 | cnt < sizeof (unsecure_envvars) / sizeof (unsecure_envvars[0]); | |
1447 | ++cnt) | |
1448 | unsetenv (unsecure_envvars[cnt]); | |
74955460 UD |
1449 | |
1450 | if (__access ("/etc/suid-debug", F_OK) != 0) | |
1451 | unsetenv ("MALLOC_CHECK_"); | |
4bae5567 UD |
1452 | } |
1453 | ||
722c33bb UD |
1454 | /* The name of the object to profile cannot be empty. */ |
1455 | if (_dl_profile != NULL && *_dl_profile == '\0') | |
1456 | _dl_profile = NULL; | |
1457 | ||
7dea968e UD |
1458 | /* If we have to run the dynamic linker in debugging mode and the |
1459 | LD_DEBUG_OUTPUT environment variable is given, we write the debug | |
1460 | messages to this file. */ | |
14c44e2e | 1461 | if (any_debug && debug_output != NULL && !__libc_enable_secure) |
7dea968e | 1462 | { |
5f2de337 UD |
1463 | #ifdef O_NOFOLLOW |
1464 | const int flags = O_WRONLY | O_APPEND | O_CREAT | O_NOFOLLOW; | |
1465 | #else | |
1466 | const int flags = O_WRONLY | O_APPEND | O_CREAT; | |
1467 | #endif | |
7a2fd787 UD |
1468 | size_t name_len = strlen (debug_output); |
1469 | char buf[name_len + 12]; | |
1470 | char *startp; | |
1471 | ||
1472 | buf[name_len + 11] = '\0'; | |
1473 | startp = _itoa_word (__getpid (), &buf[name_len + 11], 10, 0); | |
1474 | *--startp = '.'; | |
1475 | startp = memcpy (startp - name_len, debug_output, name_len); | |
1476 | ||
ba9fcb3f | 1477 | _dl_debug_fd = __open (startp, flags, DEFFILEMODE); |
7dea968e UD |
1478 | if (_dl_debug_fd == -1) |
1479 | /* We use standard output if opening the file failed. */ | |
1480 | _dl_debug_fd = STDOUT_FILENO; | |
1481 | } | |
1482 | ||
ea278354 UD |
1483 | *modep = mode; |
1484 | } | |
db276fa1 UD |
1485 | |
1486 | ||
1487 | /* Print the various times we collected. */ | |
1488 | static void | |
1489 | print_statistics (void) | |
1490 | { | |
8b07d6a8 | 1491 | #ifndef HP_TIMING_NONAVAIL |
f457369d | 1492 | char buf[200]; |
db276fa1 UD |
1493 | char *cp; |
1494 | char *wp; | |
1495 | ||
1496 | /* Total time rtld used. */ | |
1497 | if (HP_TIMING_AVAIL) | |
1498 | { | |
1499 | HP_TIMING_PRINT (buf, sizeof (buf), rtld_total_time); | |
35fc382a UD |
1500 | _dl_debug_printf ("\nruntime linker statistics:\n" |
1501 | " total startup time in dynamic loader: %s\n", buf); | |
db276fa1 UD |
1502 | } |
1503 | ||
1504 | /* Print relocation statistics. */ | |
1505 | if (HP_TIMING_AVAIL) | |
1506 | { | |
35fc382a | 1507 | char pbuf[30]; |
db276fa1 | 1508 | HP_TIMING_PRINT (buf, sizeof (buf), relocate_time); |
db276fa1 | 1509 | cp = _itoa_word ((1000 * relocate_time) / rtld_total_time, |
35fc382a UD |
1510 | pbuf + sizeof (pbuf), 10, 0); |
1511 | wp = pbuf; | |
1512 | switch (pbuf + sizeof (pbuf) - cp) | |
db276fa1 UD |
1513 | { |
1514 | case 3: | |
1515 | *wp++ = *cp++; | |
1516 | case 2: | |
1517 | *wp++ = *cp++; | |
1518 | case 1: | |
1519 | *wp++ = '.'; | |
1520 | *wp++ = *cp++; | |
1521 | } | |
1522 | *wp = '\0'; | |
cf44e2dd | 1523 | _dl_debug_printf (" time needed for relocation: %s (%s%%)\n", |
35fc382a | 1524 | buf, pbuf); |
db276fa1 | 1525 | } |
1531e094 | 1526 | #endif |
35fc382a UD |
1527 | _dl_debug_printf (" number of relocations: %lu\n", |
1528 | _dl_num_relocations); | |
962a3cdd | 1529 | _dl_debug_printf (" number of relocations from cache: %lu\n", |
647eb037 | 1530 | _dl_num_cache_relocations); |
db276fa1 | 1531 | |
1531e094 | 1532 | #ifndef HP_TIMING_NONAVAIL |
db276fa1 UD |
1533 | /* Time spend while loading the object and the dependencies. */ |
1534 | if (HP_TIMING_AVAIL) | |
1535 | { | |
35fc382a | 1536 | char pbuf[30]; |
db276fa1 | 1537 | HP_TIMING_PRINT (buf, sizeof (buf), load_time); |
db276fa1 | 1538 | cp = _itoa_word ((1000 * load_time) / rtld_total_time, |
35fc382a UD |
1539 | pbuf + sizeof (pbuf), 10, 0); |
1540 | wp = pbuf; | |
1541 | switch (pbuf + sizeof (pbuf) - cp) | |
db276fa1 UD |
1542 | { |
1543 | case 3: | |
1544 | *wp++ = *cp++; | |
1545 | case 2: | |
1546 | *wp++ = *cp++; | |
1547 | case 1: | |
1548 | *wp++ = '.'; | |
1549 | *wp++ = *cp++; | |
1550 | } | |
1551 | *wp = '\0'; | |
cf44e2dd | 1552 | _dl_debug_printf (" time needed to load objects: %s (%s%%)\n", |
35fc382a | 1553 | buf, pbuf); |
db276fa1 | 1554 | } |
1531e094 | 1555 | #endif |
db276fa1 | 1556 | } |