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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 | |
eaad82e0 UD |
124 | /* We expect less than a second for relocation. */ |
125 | #ifdef HP_SMALL_TIMING_AVAIL | |
126 | # undef HP_TIMING_AVAIL | |
127 | # define HP_TIMING_AVAIL HP_SMALL_TIMING_AVAIL | |
128 | #endif | |
129 | ||
db276fa1 | 130 | /* Variable for statistics. */ |
5732c4df | 131 | #ifndef HP_TIMING_NONAVAIL |
db276fa1 UD |
132 | static hp_timing_t rtld_total_time; |
133 | static hp_timing_t relocate_time; | |
134 | static hp_timing_t load_time; | |
5732c4df | 135 | #endif |
eaad82e0 UD |
136 | extern unsigned long int _dl_num_relocations; /* in dl-lookup.c */ |
137 | extern unsigned long int _dl_num_cache_relocations; /* in dl-reloc.c */ | |
db276fa1 | 138 | |
6a1db4ff UD |
139 | static ElfW(Addr) _dl_start_final (void *arg, struct link_map *bootstrap_map_p, |
140 | hp_timing_t start_time); | |
141 | ||
b1dbbaa4 RM |
142 | #ifdef RTLD_START |
143 | RTLD_START | |
144 | #else | |
eaad82e0 | 145 | # error "sysdeps/MACHINE/dl-machine.h fails to define RTLD_START" |
b1dbbaa4 RM |
146 | #endif |
147 | ||
ca6c7389 | 148 | static ElfW(Addr) __attribute_used__ |
d66e34cd RM |
149 | _dl_start (void *arg) |
150 | { | |
86d2c878 | 151 | struct link_map bootstrap_map; |
db276fa1 | 152 | hp_timing_t start_time; |
264ec183 | 153 | size_t cnt; |
d66e34cd | 154 | |
b1dbbaa4 RM |
155 | /* This #define produces dynamic linking inline functions for |
156 | bootstrap relocation instead of general-purpose relocation. */ | |
157 | #define RTLD_BOOTSTRAP | |
c0282c06 UD |
158 | #define RESOLVE_MAP(sym, version, flags) \ |
159 | ((*(sym))->st_shndx == SHN_UNDEF ? 0 : &bootstrap_map) | |
50463d27 UD |
160 | #define RESOLVE(sym, version, flags) \ |
161 | ((*(sym))->st_shndx == SHN_UNDEF ? 0 : bootstrap_map.l_addr) | |
b1dbbaa4 RM |
162 | #include "dynamic-link.h" |
163 | ||
db276fa1 UD |
164 | if (HP_TIMING_INLINE && HP_TIMING_AVAIL) |
165 | HP_TIMING_NOW (start_time); | |
166 | ||
264ec183 | 167 | /* Partly clean the `bootstrap_map' structure up. Don't use `memset' |
370f00c3 | 168 | since it might not be built in or inlined and we cannot make function |
264ec183 UD |
169 | calls at this point. */ |
170 | for (cnt = 0; | |
171 | cnt < sizeof (bootstrap_map.l_info) / sizeof (bootstrap_map.l_info[0]); | |
172 | ++cnt) | |
173 | bootstrap_map.l_info[cnt] = 0; | |
174 | ||
d66e34cd | 175 | /* Figure out the run-time load address of the dynamic linker itself. */ |
86d2c878 | 176 | bootstrap_map.l_addr = elf_machine_load_address (); |
d66e34cd | 177 | |
47707456 UD |
178 | /* Read our own dynamic section and fill in the info array. */ |
179 | bootstrap_map.l_ld = (void *) bootstrap_map.l_addr + elf_machine_dynamic (); | |
d3ac2d47 | 180 | elf_get_dynamic_info (&bootstrap_map); |
d66e34cd RM |
181 | |
182 | #ifdef ELF_MACHINE_BEFORE_RTLD_RELOC | |
86d2c878 | 183 | ELF_MACHINE_BEFORE_RTLD_RELOC (bootstrap_map.l_info); |
d66e34cd RM |
184 | #endif |
185 | ||
186 | /* Relocate ourselves so we can do normal function calls and | |
187 | data access using the global offset table. */ | |
421f82e5 | 188 | |
3996f34b | 189 | ELF_DYNAMIC_RELOCATE (&bootstrap_map, 0, 0); |
ea7eb7e3 UD |
190 | /* Please note that we don't allow profiling of this object and |
191 | therefore need not test whether we have to allocate the array | |
192 | for the relocation results (as done in dl-reloc.c). */ | |
421f82e5 | 193 | |
d66e34cd RM |
194 | /* Now life is sane; we can call functions and access global data. |
195 | Set up to use the operating system facilities, and find out from | |
196 | the operating system's program loader where to find the program | |
6a1db4ff UD |
197 | header table in core. Put the rest of _dl_start into a separate |
198 | function, that way the compiler cannot put accesses to the GOT | |
199 | before ELF_DYNAMIC_RELOCATE. */ | |
c0282c06 UD |
200 | { |
201 | ElfW(Addr) entry = _dl_start_final (arg, &bootstrap_map, start_time); | |
202 | ||
203 | #ifndef ELF_MACHINE_START_ADDRESS | |
204 | # define ELF_MACHINE_START_ADDRESS(map, start) (start) | |
205 | #endif | |
206 | ||
207 | return ELF_MACHINE_START_ADDRESS (_dl_loaded, entry); | |
208 | } | |
6a1db4ff UD |
209 | } |
210 | ||
211 | ||
212 | static ElfW(Addr) | |
213 | _dl_start_final (void *arg, struct link_map *bootstrap_map_p, | |
214 | hp_timing_t start_time) | |
215 | { | |
216 | /* The use of `alloca' here looks ridiculous but it helps. The goal | |
217 | is to avoid the function from being inlined. There is no official | |
218 | way to do this so we use this trick. gcc never inlines functions | |
219 | which use `alloca'. */ | |
220 | ElfW(Addr) *start_addr = alloca (sizeof (ElfW(Addr))); | |
d66e34cd | 221 | |
db276fa1 UD |
222 | if (HP_TIMING_AVAIL) |
223 | { | |
224 | /* If it hasn't happen yet record the startup time. */ | |
225 | if (! HP_TIMING_INLINE) | |
226 | HP_TIMING_NOW (start_time); | |
227 | ||
228 | /* Initialize the timing functions. */ | |
229 | HP_TIMING_DIFF_INIT (); | |
230 | } | |
231 | ||
86d2c878 | 232 | /* Transfer data about ourselves to the permanent link_map structure. */ |
6a1db4ff UD |
233 | _dl_rtld_map.l_addr = bootstrap_map_p->l_addr; |
234 | _dl_rtld_map.l_ld = bootstrap_map_p->l_ld; | |
f41c8091 | 235 | _dl_rtld_map.l_opencount = 1; |
6a1db4ff | 236 | memcpy (_dl_rtld_map.l_info, bootstrap_map_p->l_info, |
ee188d55 RM |
237 | sizeof _dl_rtld_map.l_info); |
238 | _dl_setup_hash (&_dl_rtld_map); | |
370f00c3 | 239 | _dl_rtld_map.l_mach = bootstrap_map_p->l_mach; |
86d2c878 | 240 | |
052b6a6c UD |
241 | /* Don't bother trying to work out how ld.so is mapped in memory. */ |
242 | _dl_rtld_map.l_map_start = ~0; | |
243 | _dl_rtld_map.l_map_end = ~0; | |
244 | ||
d66e34cd RM |
245 | /* Call the OS-dependent function to set up life so we can do things like |
246 | file access. It will call `dl_main' (below) to do all the real work | |
247 | of the dynamic linker, and then unwind our frame and run the user | |
248 | entry point on the same stack we entered on. */ | |
6a1db4ff | 249 | *start_addr = _dl_sysdep_start (arg, &dl_main); |
8b07d6a8 | 250 | #ifndef HP_TIMING_NONAVAIL |
db276fa1 UD |
251 | if (HP_TIMING_AVAIL) |
252 | { | |
253 | hp_timing_t end_time; | |
254 | ||
255 | /* Get the current time. */ | |
256 | HP_TIMING_NOW (end_time); | |
257 | ||
258 | /* Compute the difference. */ | |
259 | HP_TIMING_DIFF (rtld_total_time, start_time, end_time); | |
260 | } | |
8b07d6a8 | 261 | #endif |
db276fa1 | 262 | |
2ace5721 | 263 | if (__builtin_expect (_dl_debug_mask & DL_DEBUG_STATISTICS, 0)) |
db276fa1 UD |
264 | print_statistics (); |
265 | ||
6a1db4ff | 266 | return *start_addr; |
d66e34cd RM |
267 | } |
268 | ||
d66e34cd RM |
269 | /* Now life is peachy; we can do all normal operations. |
270 | On to the real work. */ | |
271 | ||
993b3242 UD |
272 | /* Some helper functions. */ |
273 | ||
274 | /* Arguments to relocate_doit. */ | |
275 | struct relocate_args | |
276 | { | |
277 | struct link_map *l; | |
278 | int lazy; | |
279 | }; | |
280 | ||
281 | struct map_args | |
282 | { | |
283 | /* Argument to map_doit. */ | |
284 | char *str; | |
285 | /* Return value of map_doit. */ | |
286 | struct link_map *main_map; | |
287 | }; | |
288 | ||
289 | /* Arguments to version_check_doit. */ | |
290 | struct version_check_args | |
291 | { | |
993b3242 | 292 | int doexit; |
145b8413 | 293 | int dotrace; |
993b3242 UD |
294 | }; |
295 | ||
296 | static void | |
297 | relocate_doit (void *a) | |
298 | { | |
299 | struct relocate_args *args = (struct relocate_args *) a; | |
300 | ||
be935610 | 301 | _dl_relocate_object (args->l, args->l->l_scope, |
c0fb8a56 | 302 | args->lazy, 0); |
993b3242 UD |
303 | } |
304 | ||
305 | static void | |
306 | map_doit (void *a) | |
307 | { | |
be935610 | 308 | struct map_args *args = (struct map_args *) a; |
bf8b3e74 | 309 | args->main_map = _dl_map_object (NULL, args->str, 0, lt_library, 0, 0); |
993b3242 UD |
310 | } |
311 | ||
312 | static void | |
313 | version_check_doit (void *a) | |
314 | { | |
be935610 | 315 | struct version_check_args *args = (struct version_check_args *) a; |
145b8413 | 316 | if (_dl_check_all_versions (_dl_loaded, 1, args->dotrace) && args->doexit) |
993b3242 UD |
317 | /* We cannot start the application. Abort now. */ |
318 | _exit (1); | |
319 | } | |
320 | ||
ce37fa88 UD |
321 | |
322 | static inline struct link_map * | |
323 | find_needed (const char *name) | |
324 | { | |
be935610 | 325 | unsigned int n = _dl_loaded->l_searchlist.r_nlist; |
ce37fa88 | 326 | |
be935610 UD |
327 | while (n-- > 0) |
328 | if (_dl_name_match_p (name, _dl_loaded->l_searchlist.r_list[n])) | |
329 | return _dl_loaded->l_searchlist.r_list[n]; | |
ce37fa88 UD |
330 | |
331 | /* Should never happen. */ | |
332 | return NULL; | |
333 | } | |
334 | ||
335 | static int | |
336 | match_version (const char *string, struct link_map *map) | |
337 | { | |
a42195db | 338 | const char *strtab = (const void *) D_PTR (map, l_info[DT_STRTAB]); |
ce37fa88 UD |
339 | ElfW(Verdef) *def; |
340 | ||
b0982c4a | 341 | #define VERDEFTAG (DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGIDX (DT_VERDEF)) |
ce37fa88 UD |
342 | if (map->l_info[VERDEFTAG] == NULL) |
343 | /* The file has no symbol versioning. */ | |
344 | return 0; | |
345 | ||
346 | def = (ElfW(Verdef) *) ((char *) map->l_addr | |
347 | + map->l_info[VERDEFTAG]->d_un.d_ptr); | |
348 | while (1) | |
349 | { | |
350 | ElfW(Verdaux) *aux = (ElfW(Verdaux) *) ((char *) def + def->vd_aux); | |
351 | ||
352 | /* Compare the version strings. */ | |
353 | if (strcmp (string, strtab + aux->vda_name) == 0) | |
354 | /* Bingo! */ | |
355 | return 1; | |
356 | ||
357 | /* If no more definitions we failed to find what we want. */ | |
358 | if (def->vd_next == 0) | |
359 | break; | |
360 | ||
361 | /* Next definition. */ | |
362 | def = (ElfW(Verdef) *) ((char *) def + def->vd_next); | |
363 | } | |
364 | ||
365 | return 0; | |
366 | } | |
367 | ||
120b4c49 UD |
368 | static const char *library_path; /* The library search path. */ |
369 | static const char *preloadlist; /* The list preloaded objects. */ | |
370 | static int version_info; /* Nonzero if information about | |
371 | versions has to be printed. */ | |
a1a9d215 | 372 | |
d66e34cd | 373 | static void |
266180eb | 374 | dl_main (const ElfW(Phdr) *phdr, |
72f70279 | 375 | ElfW(Word) phnum, |
266180eb | 376 | ElfW(Addr) *user_entry) |
d66e34cd | 377 | { |
266180eb | 378 | const ElfW(Phdr) *ph; |
ea278354 | 379 | enum mode mode; |
2064087b RM |
380 | struct link_map **preloads; |
381 | unsigned int npreloads; | |
14bab8de UD |
382 | size_t file_size; |
383 | char *file; | |
2f6d1f1b | 384 | int has_interp = 0; |
77aba05b | 385 | unsigned int i; |
9a51759b | 386 | int rtld_is_main = 0; |
5732c4df | 387 | #ifndef HP_TIMING_NONAVAIL |
db276fa1 UD |
388 | hp_timing_t start; |
389 | hp_timing_t stop; | |
390 | hp_timing_t diff; | |
5732c4df | 391 | #endif |
d66e34cd | 392 | |
ea278354 | 393 | /* Process the environment variable which control the behaviour. */ |
ba9fcb3f | 394 | process_envvars (&mode); |
3996f34b | 395 | |
46ec036d UD |
396 | /* Set up a flag which tells we are just starting. */ |
397 | _dl_starting_up = 1; | |
398 | ||
a16956f3 | 399 | if (*user_entry == (ElfW(Addr)) ENTRY_POINT) |
0200214b RM |
400 | { |
401 | /* Ho ho. We are not the program interpreter! We are the program | |
402 | itself! This means someone ran ld.so as a command. Well, that | |
403 | might be convenient to do sometimes. We support it by | |
404 | interpreting the args like this: | |
405 | ||
406 | ld.so PROGRAM ARGS... | |
407 | ||
408 | The first argument is the name of a file containing an ELF | |
409 | executable we will load and run with the following arguments. | |
410 | To simplify life here, PROGRAM is searched for using the | |
411 | normal rules for shared objects, rather than $PATH or anything | |
412 | like that. We just load it and use its entry point; we don't | |
413 | pay attention to its PT_INTERP command (we are the interpreter | |
414 | ourselves). This is an easy way to test a new ld.so before | |
415 | installing it. */ | |
9a51759b | 416 | rtld_is_main = 1; |
421f82e5 | 417 | |
ffee1316 RM |
418 | /* Note the place where the dynamic linker actually came from. */ |
419 | _dl_rtld_map.l_name = _dl_argv[0]; | |
6a76c115 | 420 | |
fd26970f UD |
421 | while (_dl_argc > 1) |
422 | if (! strcmp (_dl_argv[1], "--list")) | |
423 | { | |
424 | mode = list; | |
12b5b6b7 | 425 | _dl_lazy = -1; /* This means do no dependency analysis. */ |
61965e9b | 426 | |
fd26970f UD |
427 | ++_dl_skip_args; |
428 | --_dl_argc; | |
429 | ++_dl_argv; | |
430 | } | |
431 | else if (! strcmp (_dl_argv[1], "--verify")) | |
432 | { | |
433 | mode = verify; | |
6a76c115 | 434 | |
fd26970f UD |
435 | ++_dl_skip_args; |
436 | --_dl_argc; | |
437 | ++_dl_argv; | |
438 | } | |
310930c1 | 439 | else if (! strcmp (_dl_argv[1], "--library-path") && _dl_argc > 2) |
880f421f UD |
440 | { |
441 | library_path = _dl_argv[2]; | |
442 | ||
310930c1 UD |
443 | _dl_skip_args += 2; |
444 | _dl_argc -= 2; | |
445 | _dl_argv += 2; | |
446 | } | |
b0a01055 | 447 | else if (! strcmp (_dl_argv[1], "--inhibit-rpath") && _dl_argc > 2) |
310930c1 | 448 | { |
b0a01055 | 449 | _dl_inhibit_rpath = _dl_argv[2]; |
310930c1 | 450 | |
880f421f UD |
451 | _dl_skip_args += 2; |
452 | _dl_argc -= 2; | |
453 | _dl_argv += 2; | |
454 | } | |
fd26970f UD |
455 | else |
456 | break; | |
d66e34cd | 457 | |
61eb22d3 UD |
458 | /* If we have no further argument the program was called incorrectly. |
459 | Grant the user some education. */ | |
460 | if (_dl_argc < 2) | |
35fc382a | 461 | _dl_fatal_printf ("\ |
2bcf29ba | 462 | Usage: ld.so [OPTION]... EXECUTABLE-FILE [ARGS-FOR-PROGRAM...]\n\ |
61eb22d3 UD |
463 | You have invoked `ld.so', the helper program for shared library executables.\n\ |
464 | This program usually lives in the file `/lib/ld.so', and special directives\n\ | |
465 | in executable files using ELF shared libraries tell the system's program\n\ | |
466 | loader to load the helper program from this file. This helper program loads\n\ | |
467 | the shared libraries needed by the program executable, prepares the program\n\ | |
468 | to run, and runs it. You may invoke this helper program directly from the\n\ | |
469 | command line to load and run an ELF executable file; this is like executing\n\ | |
470 | that file itself, but always uses this helper program from the file you\n\ | |
471 | specified, instead of the helper program file specified in the executable\n\ | |
472 | file you run. This is mostly of use for maintainers to test new versions\n\ | |
2bcf29ba UD |
473 | of this helper program; chances are you did not intend to run this program.\n\ |
474 | \n\ | |
b0a01055 UD |
475 | --list list all dependencies and how they are resolved\n\ |
476 | --verify verify that given object really is a dynamically linked\n\ | |
e8b1163e | 477 | object we can handle\n\ |
b0a01055 UD |
478 | --library-path PATH use given PATH instead of content of the environment\n\ |
479 | variable LD_LIBRARY_PATH\n\ | |
fcf70d41 | 480 | --inhibit-rpath LIST ignore RUNPATH and RPATH information in object names\n\ |
35fc382a | 481 | in LIST\n"); |
61eb22d3 | 482 | |
0200214b RM |
483 | ++_dl_skip_args; |
484 | --_dl_argc; | |
485 | ++_dl_argv; | |
91f62ce6 | 486 | |
da832465 UD |
487 | /* Initialize the data structures for the search paths for shared |
488 | objects. */ | |
489 | _dl_init_paths (library_path); | |
490 | ||
9a821cf9 | 491 | if (__builtin_expect (mode, normal) == verify) |
2de99474 | 492 | { |
8e17ea58 UD |
493 | const char *objname; |
494 | const char *err_str = NULL; | |
993b3242 | 495 | struct map_args args; |
2de99474 | 496 | |
993b3242 | 497 | args.str = _dl_argv[0]; |
8e17ea58 UD |
498 | (void) _dl_catch_error (&objname, &err_str, map_doit, &args); |
499 | if (__builtin_expect (err_str != NULL, 0)) | |
dcf0671d | 500 | { |
ca3c0135 UD |
501 | if (err_str != _dl_out_of_memory) |
502 | free ((char *) err_str); | |
dcf0671d UD |
503 | _exit (EXIT_FAILURE); |
504 | } | |
2de99474 UD |
505 | } |
506 | else | |
db276fa1 UD |
507 | { |
508 | HP_TIMING_NOW (start); | |
bf8b3e74 | 509 | _dl_map_object (NULL, _dl_argv[0], 0, lt_library, 0, 0); |
db276fa1 | 510 | HP_TIMING_NOW (stop); |
61e0617a | 511 | |
db276fa1 UD |
512 | HP_TIMING_DIFF (load_time, start, stop); |
513 | } | |
2de99474 | 514 | |
be935610 | 515 | phdr = _dl_loaded->l_phdr; |
72f70279 | 516 | phnum = _dl_loaded->l_phnum; |
143e2b96 UD |
517 | /* We overwrite here a pointer to a malloc()ed string. But since |
518 | the malloc() implementation used at this point is the dummy | |
519 | implementations which has no real free() function it does not | |
520 | makes sense to free the old string first. */ | |
be935610 UD |
521 | _dl_loaded->l_name = (char *) ""; |
522 | *user_entry = _dl_loaded->l_entry; | |
0200214b RM |
523 | } |
524 | else | |
525 | { | |
526 | /* Create a link_map for the executable itself. | |
527 | This will be what dlopen on "" returns. */ | |
87c812c2 | 528 | _dl_new_object ((char *) "", "", lt_executable, NULL); |
be935610 | 529 | if (_dl_loaded == NULL) |
35fc382a | 530 | _dl_fatal_printf ("cannot allocate memory for link map\n"); |
be935610 | 531 | _dl_loaded->l_phdr = phdr; |
72f70279 | 532 | _dl_loaded->l_phnum = phnum; |
be935610 | 533 | _dl_loaded->l_entry = *user_entry; |
da832465 | 534 | |
61e0617a UD |
535 | /* At this point we are in a bit of trouble. We would have to |
536 | fill in the values for l_dev and l_ino. But in general we | |
537 | do not know where the file is. We also do not handle AT_EXECFD | |
538 | even if it would be passed up. | |
539 | ||
540 | We leave the values here defined to 0. This is normally no | |
541 | problem as the program code itself is normally no shared | |
542 | object and therefore cannot be loaded dynamically. Nothing | |
543 | prevent the use of dynamic binaries and in these situations | |
544 | we might get problems. We might not be able to find out | |
545 | whether the object is already loaded. But since there is no | |
546 | easy way out and because the dynamic binary must also not | |
547 | have an SONAME we ignore this program for now. If it becomes | |
548 | a problem we can force people using SONAMEs. */ | |
549 | ||
97a51d8a UD |
550 | /* We delay initializing the path structure until we got the dynamic |
551 | information for the program. */ | |
0200214b RM |
552 | } |
553 | ||
2373b30e | 554 | _dl_loaded->l_map_end = 0; |
052b6a6c | 555 | /* Perhaps the executable has no PT_LOAD header entries at all. */ |
be935610 | 556 | _dl_loaded->l_map_start = ~0; |
e7beef5f UD |
557 | /* We opened the file, account for it. */ |
558 | ++_dl_loaded->l_opencount; | |
052b6a6c | 559 | |
0200214b | 560 | /* Scan the program header table for the dynamic section. */ |
72f70279 | 561 | for (ph = phdr; ph < &phdr[phnum]; ++ph) |
0200214b RM |
562 | switch (ph->p_type) |
563 | { | |
da832465 UD |
564 | case PT_PHDR: |
565 | /* Find out the load address. */ | |
be935610 | 566 | _dl_loaded->l_addr = (ElfW(Addr)) phdr - ph->p_vaddr; |
da832465 | 567 | break; |
0200214b RM |
568 | case PT_DYNAMIC: |
569 | /* This tells us where to find the dynamic section, | |
570 | which tells us everything we need to do. */ | |
be935610 | 571 | _dl_loaded->l_ld = (void *) _dl_loaded->l_addr + ph->p_vaddr; |
0200214b RM |
572 | break; |
573 | case PT_INTERP: | |
574 | /* This "interpreter segment" was used by the program loader to | |
575 | find the program interpreter, which is this program itself, the | |
576 | dynamic linker. We note what name finds us, so that a future | |
577 | dlopen call or DT_NEEDED entry, for something that wants to link | |
578 | against the dynamic linker as a shared library, will know that | |
579 | the shared object is already loaded. */ | |
be935610 UD |
580 | _dl_rtld_libname.name = ((const char *) _dl_loaded->l_addr |
581 | + ph->p_vaddr); | |
752a2a50 | 582 | /* _dl_rtld_libname.next = NULL; Already zero. */ |
c84142e8 | 583 | _dl_rtld_map.l_libname = &_dl_rtld_libname; |
f41c8091 UD |
584 | |
585 | /* Ordinarilly, we would get additional names for the loader from | |
586 | our DT_SONAME. This can't happen if we were actually linked as | |
587 | a static executable (detect this case when we have no DYNAMIC). | |
588 | If so, assume the filename component of the interpreter path to | |
589 | be our SONAME, and add it to our name list. */ | |
590 | if (_dl_rtld_map.l_ld == NULL) | |
591 | { | |
592 | char *p = strrchr (_dl_rtld_libname.name, '/'); | |
593 | if (p) | |
594 | { | |
595 | _dl_rtld_libname2.name = p+1; | |
752a2a50 | 596 | /* _dl_rtld_libname2.next = NULL; Already zero. */ |
f41c8091 UD |
597 | _dl_rtld_libname.next = &_dl_rtld_libname2; |
598 | } | |
599 | } | |
600 | ||
2f6d1f1b | 601 | has_interp = 1; |
0200214b | 602 | break; |
052b6a6c | 603 | case PT_LOAD: |
052b6a6c UD |
604 | { |
605 | ElfW(Addr) mapstart; | |
2373b30e UD |
606 | ElfW(Addr) allocend; |
607 | ||
608 | /* Remember where the main program starts in memory. */ | |
be935610 UD |
609 | mapstart = _dl_loaded->l_addr + (ph->p_vaddr & ~(ph->p_align - 1)); |
610 | if (_dl_loaded->l_map_start > mapstart) | |
611 | _dl_loaded->l_map_start = mapstart; | |
2373b30e UD |
612 | |
613 | /* Also where it ends. */ | |
614 | allocend = _dl_loaded->l_addr + ph->p_vaddr + ph->p_memsz; | |
615 | if (_dl_loaded->l_map_end < allocend) | |
616 | _dl_loaded->l_map_end = allocend; | |
052b6a6c UD |
617 | } |
618 | break; | |
0200214b | 619 | } |
2373b30e UD |
620 | if (! _dl_loaded->l_map_end) |
621 | _dl_loaded->l_map_end = ~0; | |
ffee1316 | 622 | if (! _dl_rtld_map.l_libname && _dl_rtld_map.l_name) |
c84142e8 UD |
623 | { |
624 | /* We were invoked directly, so the program might not have a | |
625 | PT_INTERP. */ | |
626 | _dl_rtld_libname.name = _dl_rtld_map.l_name; | |
752a2a50 | 627 | /* _dl_rtld_libname.next = NULL; Alread zero. */ |
c84142e8 UD |
628 | _dl_rtld_map.l_libname = &_dl_rtld_libname; |
629 | } | |
ffee1316 RM |
630 | else |
631 | assert (_dl_rtld_map.l_libname); /* How else did we get here? */ | |
0200214b | 632 | |
9a51759b UD |
633 | if (! rtld_is_main) |
634 | { | |
635 | /* Extract the contents of the dynamic section for easy access. */ | |
d3ac2d47 | 636 | elf_get_dynamic_info (_dl_loaded); |
9a51759b UD |
637 | if (_dl_loaded->l_info[DT_HASH]) |
638 | /* Set up our cache of pointers into the hash table. */ | |
639 | _dl_setup_hash (_dl_loaded); | |
640 | } | |
0200214b | 641 | |
9a821cf9 | 642 | if (__builtin_expect (mode, normal) == verify) |
e2102c14 UD |
643 | { |
644 | /* We were called just to verify that this is a dynamic | |
645 | executable using us as the program interpreter. Exit with an | |
646 | error if we were not able to load the binary or no interpreter | |
647 | is specified (i.e., this is no dynamically linked binary. */ | |
be935610 | 648 | if (_dl_loaded->l_ld == NULL) |
e2102c14 | 649 | _exit (1); |
e2102c14 UD |
650 | |
651 | /* We allow here some platform specific code. */ | |
652 | #ifdef DISTINGUISH_LIB_VERSIONS | |
653 | DISTINGUISH_LIB_VERSIONS; | |
654 | #endif | |
eb406346 | 655 | _exit (has_interp ? 0 : 2); |
e2102c14 UD |
656 | } |
657 | ||
9a51759b | 658 | if (! rtld_is_main) |
97a51d8a UD |
659 | /* Initialize the data structures for the search paths for shared |
660 | objects. */ | |
120b4c49 | 661 | _dl_init_paths (library_path); |
97a51d8a | 662 | |
0200214b | 663 | /* Put the link_map for ourselves on the chain so it can be found by |
ceb2d9aa | 664 | name. Note that at this point the global chain of link maps contains |
be935610 | 665 | exactly one element, which is pointed to by _dl_loaded. */ |
ffee1316 RM |
666 | if (! _dl_rtld_map.l_name) |
667 | /* If not invoked directly, the dynamic linker shared object file was | |
668 | found by the PT_INTERP name. */ | |
c84142e8 | 669 | _dl_rtld_map.l_name = (char *) _dl_rtld_map.l_libname->name; |
ba79d61b | 670 | _dl_rtld_map.l_type = lt_library; |
be935610 UD |
671 | _dl_loaded->l_next = &_dl_rtld_map; |
672 | _dl_rtld_map.l_prev = _dl_loaded; | |
1ebba33e | 673 | ++_dl_nloaded; |
0200214b | 674 | |
14bab8de | 675 | /* We have two ways to specify objects to preload: via environment |
49c091e5 | 676 | variable and via the file /etc/ld.so.preload. The latter can also |
14bab8de | 677 | be used when security is enabled. */ |
2064087b RM |
678 | preloads = NULL; |
679 | npreloads = 0; | |
14bab8de | 680 | |
db33f7d4 | 681 | if (__builtin_expect (preloadlist != NULL, 0)) |
c4029823 | 682 | { |
566efee2 UD |
683 | /* The LD_PRELOAD environment variable gives list of libraries |
684 | separated by white space or colons that are loaded before the | |
fd26970f UD |
685 | executable's dependencies and prepended to the global scope |
686 | list. If the binary is running setuid all elements | |
687 | containing a '/' are ignored since it is insecure. */ | |
688 | char *list = strdupa (preloadlist); | |
689 | char *p; | |
db276fa1 UD |
690 | |
691 | HP_TIMING_NOW (start); | |
692 | ||
566efee2 | 693 | while ((p = strsep (&list, " :")) != NULL) |
e2102c14 | 694 | if (p[0] != '\0' |
db33f7d4 UD |
695 | && (__builtin_expect (! __libc_enable_secure, 1) |
696 | || strchr (p, '/') == NULL)) | |
fd26970f | 697 | { |
be935610 | 698 | struct link_map *new_map = _dl_map_object (_dl_loaded, p, 1, |
bf8b3e74 | 699 | lt_library, 0, 0); |
42c4f32a | 700 | if (++new_map->l_opencount == 1) |
bd355af0 UD |
701 | /* It is no duplicate. */ |
702 | ++npreloads; | |
fd26970f | 703 | } |
db276fa1 UD |
704 | |
705 | HP_TIMING_NOW (stop); | |
706 | HP_TIMING_DIFF (diff, start, stop); | |
707 | HP_TIMING_ACCUM_NT (load_time, diff); | |
c4029823 UD |
708 | } |
709 | ||
14bab8de UD |
710 | /* Read the contents of the file. */ |
711 | file = _dl_sysdep_read_whole_file ("/etc/ld.so.preload", &file_size, | |
712 | PROT_READ | PROT_WRITE); | |
40b07f5b | 713 | if (__builtin_expect (file != MAP_FAILED, 0)) |
14bab8de UD |
714 | { |
715 | /* Parse the file. It contains names of libraries to be loaded, | |
716 | separated by white spaces or `:'. It may also contain | |
717 | comments introduced by `#'. */ | |
718 | char *problem; | |
719 | char *runp; | |
720 | size_t rest; | |
721 | ||
722 | /* Eliminate comments. */ | |
723 | runp = file; | |
724 | rest = file_size; | |
725 | while (rest > 0) | |
726 | { | |
727 | char *comment = memchr (runp, '#', rest); | |
728 | if (comment == NULL) | |
729 | break; | |
730 | ||
731 | rest -= comment - runp; | |
732 | do | |
733 | *comment = ' '; | |
734 | while (--rest > 0 && *++comment != '\n'); | |
735 | } | |
736 | ||
737 | /* We have one problematic case: if we have a name at the end of | |
738 | the file without a trailing terminating characters, we cannot | |
739 | place the \0. Handle the case separately. */ | |
49891c10 UD |
740 | if (file[file_size - 1] != ' ' && file[file_size - 1] != '\t' |
741 | && file[file_size - 1] != '\n' && file[file_size - 1] != ':') | |
14bab8de UD |
742 | { |
743 | problem = &file[file_size]; | |
744 | while (problem > file && problem[-1] != ' ' && problem[-1] != '\t' | |
49891c10 | 745 | && problem[-1] != '\n' && problem[-1] != ':') |
14bab8de UD |
746 | --problem; |
747 | ||
748 | if (problem > file) | |
749 | problem[-1] = '\0'; | |
750 | } | |
751 | else | |
49891c10 UD |
752 | { |
753 | problem = NULL; | |
754 | file[file_size - 1] = '\0'; | |
755 | } | |
14bab8de | 756 | |
db276fa1 UD |
757 | HP_TIMING_NOW (start); |
758 | ||
14bab8de UD |
759 | if (file != problem) |
760 | { | |
761 | char *p; | |
e2102c14 | 762 | runp = file; |
14bab8de | 763 | while ((p = strsep (&runp, ": \t\n")) != NULL) |
e2102c14 UD |
764 | if (p[0] != '\0') |
765 | { | |
be935610 | 766 | struct link_map *new_map = _dl_map_object (_dl_loaded, p, 1, |
bf8b3e74 | 767 | lt_library, 0, 0); |
42c4f32a | 768 | if (++new_map->l_opencount == 1) |
e2102c14 UD |
769 | /* It is no duplicate. */ |
770 | ++npreloads; | |
771 | } | |
14bab8de UD |
772 | } |
773 | ||
774 | if (problem != NULL) | |
775 | { | |
776 | char *p = strndupa (problem, file_size - (problem - file)); | |
be935610 | 777 | struct link_map *new_map = _dl_map_object (_dl_loaded, p, 1, |
bf8b3e74 | 778 | lt_library, 0, 0); |
42c4f32a | 779 | if (++new_map->l_opencount == 1) |
bd355af0 UD |
780 | /* It is no duplicate. */ |
781 | ++npreloads; | |
14bab8de UD |
782 | } |
783 | ||
db276fa1 UD |
784 | HP_TIMING_NOW (stop); |
785 | HP_TIMING_DIFF (diff, start, stop); | |
786 | HP_TIMING_ACCUM_NT (load_time, diff); | |
787 | ||
14bab8de UD |
788 | /* We don't need the file anymore. */ |
789 | __munmap (file, file_size); | |
790 | } | |
791 | ||
db33f7d4 | 792 | if (__builtin_expect (npreloads, 0) != 0) |
14bab8de UD |
793 | { |
794 | /* Set up PRELOADS with a vector of the preloaded libraries. */ | |
795 | struct link_map *l; | |
14bab8de UD |
796 | preloads = __alloca (npreloads * sizeof preloads[0]); |
797 | l = _dl_rtld_map.l_next; /* End of the chain before preloads. */ | |
798 | i = 0; | |
799 | do | |
800 | { | |
801 | preloads[i++] = l; | |
802 | l = l->l_next; | |
803 | } while (l); | |
804 | assert (i == npreloads); | |
805 | } | |
806 | ||
2064087b RM |
807 | /* Load all the libraries specified by DT_NEEDED entries. If LD_PRELOAD |
808 | specified some libraries to load, these are inserted before the actual | |
809 | dependencies in the executable's searchlist for symbol resolution. */ | |
db276fa1 | 810 | HP_TIMING_NOW (start); |
d9cb1a7d | 811 | _dl_map_object_deps (_dl_loaded, preloads, npreloads, mode == trace); |
db276fa1 UD |
812 | HP_TIMING_NOW (stop); |
813 | HP_TIMING_DIFF (diff, start, stop); | |
814 | HP_TIMING_ACCUM_NT (load_time, diff); | |
e3e35cfc | 815 | |
42c4f32a UD |
816 | /* Mark all objects as being in the global scope and set the open |
817 | counter. */ | |
e3e35cfc | 818 | for (i = _dl_loaded->l_searchlist.r_nlist; i > 0; ) |
42c4f32a UD |
819 | { |
820 | --i; | |
821 | _dl_loaded->l_searchlist.r_list[i]->l_global = 1; | |
822 | ++_dl_loaded->l_searchlist.r_list[i]->l_opencount; | |
823 | } | |
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 | ||
c2a714f3 | 836 | if (__builtin_expect (_dl_rtld_map.l_opencount > 1, 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 | 882 | if (! _dl_loaded->l_info[DT_NEEDED]) |
35fc382a | 883 | _dl_printf ("\tstatically linked\n"); |
0200214b | 884 | else |
ceb2d9aa UD |
885 | { |
886 | struct link_map *l; | |
887 | ||
888 | for (l = _dl_loaded->l_next; l; l = l->l_next) | |
a881e0a0 | 889 | if (l->l_faked) |
ceb2d9aa | 890 | /* The library was not found. */ |
35fc382a | 891 | _dl_printf ("\t%s => not found\n", l->l_libname->name); |
ceb2d9aa | 892 | else |
35fc382a | 893 | _dl_printf ("\t%s => %s (0x%0*Zx)\n", l->l_libname->name, |
8a0746ae | 894 | l->l_name, (int) sizeof l->l_addr * 2, l->l_addr); |
ceb2d9aa | 895 | } |
1a3a58fd | 896 | |
9a821cf9 | 897 | if (__builtin_expect (mode, trace) != trace) |
cddcfecf RM |
898 | for (i = 1; i < _dl_argc; ++i) |
899 | { | |
900 | const ElfW(Sym) *ref = NULL; | |
c0282c06 UD |
901 | ElfW(Addr) loadbase; |
902 | lookup_t result; | |
c0282c06 UD |
903 | |
904 | result = _dl_lookup_symbol (_dl_argv[i], _dl_loaded, | |
905 | &ref, _dl_loaded->l_scope, | |
967cdc10 | 906 | ELF_RTYPE_CLASS_PLT, 1); |
c0282c06 UD |
907 | |
908 | loadbase = LOOKUP_VALUE_ADDRESS (result); | |
909 | ||
35fc382a | 910 | _dl_printf ("%s found at 0x%0*Zd in object at 0x%0*Zd\n", |
8a0746ae RM |
911 | _dl_argv[i], |
912 | (int) sizeof ref->st_value * 2, ref->st_value, | |
913 | (int) sizeof loadbase * 2, loadbase); | |
cddcfecf | 914 | } |
ce37fa88 | 915 | else |
fd26970f | 916 | { |
667b0577 UD |
917 | /* If LD_WARN is set warn about undefined symbols. */ |
918 | if (_dl_lazy >= 0 && _dl_verbose) | |
ce37fa88 UD |
919 | { |
920 | /* We have to do symbol dependency testing. */ | |
921 | struct relocate_args args; | |
922 | struct link_map *l; | |
993b3242 | 923 | |
12b5b6b7 | 924 | args.lazy = _dl_lazy; |
fd26970f | 925 | |
ce37fa88 UD |
926 | l = _dl_loaded; |
927 | while (l->l_next) | |
928 | l = l->l_next; | |
929 | do | |
930 | { | |
a881e0a0 | 931 | if (l != &_dl_rtld_map && ! l->l_faked) |
ce37fa88 UD |
932 | { |
933 | args.l = l; | |
934 | _dl_receive_error (print_unresolved, relocate_doit, | |
935 | &args); | |
ce37fa88 UD |
936 | } |
937 | l = l->l_prev; | |
938 | } while (l); | |
939 | } | |
940 | ||
b0982c4a | 941 | #define VERNEEDTAG (DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGIDX (DT_VERNEED)) |
120b4c49 | 942 | if (version_info) |
fd26970f | 943 | { |
ce37fa88 UD |
944 | /* Print more information. This means here, print information |
945 | about the versions needed. */ | |
946 | int first = 1; | |
947 | struct link_map *map = _dl_loaded; | |
948 | ||
949 | for (map = _dl_loaded; map != NULL; map = map->l_next) | |
fd26970f | 950 | { |
f41c8091 | 951 | const char *strtab; |
ce37fa88 | 952 | ElfW(Dyn) *dyn = map->l_info[VERNEEDTAG]; |
f41c8091 UD |
953 | ElfW(Verneed) *ent; |
954 | ||
955 | if (dyn == NULL) | |
956 | continue; | |
957 | ||
a42195db | 958 | strtab = (const void *) D_PTR (map, l_info[DT_STRTAB]); |
f41c8091 | 959 | ent = (ElfW(Verneed) *) (map->l_addr + dyn->d_un.d_ptr); |
ce37fa88 | 960 | |
f41c8091 | 961 | if (first) |
ce37fa88 | 962 | { |
35fc382a | 963 | _dl_printf ("\n\tVersion information:\n"); |
f41c8091 UD |
964 | first = 0; |
965 | } | |
ce37fa88 | 966 | |
35fc382a UD |
967 | _dl_printf ("\t%s:\n", |
968 | map->l_name[0] ? map->l_name : _dl_argv[0]); | |
f41c8091 UD |
969 | |
970 | while (1) | |
971 | { | |
972 | ElfW(Vernaux) *aux; | |
973 | struct link_map *needed; | |
ce37fa88 | 974 | |
f41c8091 UD |
975 | needed = find_needed (strtab + ent->vn_file); |
976 | aux = (ElfW(Vernaux) *) ((char *) ent + ent->vn_aux); | |
ce37fa88 UD |
977 | |
978 | while (1) | |
979 | { | |
f41c8091 UD |
980 | const char *fname = NULL; |
981 | ||
f41c8091 | 982 | if (needed != NULL |
ba9fcb3f UD |
983 | && match_version (strtab + aux->vna_name, |
984 | needed)) | |
f41c8091 UD |
985 | fname = needed->l_name; |
986 | ||
35fc382a UD |
987 | _dl_printf ("\t\t%s (%s) %s=> %s\n", |
988 | strtab + ent->vn_file, | |
989 | strtab + aux->vna_name, | |
990 | aux->vna_flags & VER_FLG_WEAK | |
991 | ? "[WEAK] " : "", | |
992 | fname ?: "not found"); | |
ce37fa88 | 993 | |
f41c8091 UD |
994 | if (aux->vna_next == 0) |
995 | /* No more symbols. */ | |
ce37fa88 UD |
996 | break; |
997 | ||
f41c8091 UD |
998 | /* Next symbol. */ |
999 | aux = (ElfW(Vernaux) *) ((char *) aux | |
1000 | + aux->vna_next); | |
ce37fa88 | 1001 | } |
f41c8091 UD |
1002 | |
1003 | if (ent->vn_next == 0) | |
1004 | /* No more dependencies. */ | |
1005 | break; | |
1006 | ||
1007 | /* Next dependency. */ | |
1008 | ent = (ElfW(Verneed) *) ((char *) ent + ent->vn_next); | |
ce37fa88 | 1009 | } |
fd26970f | 1010 | } |
ce37fa88 | 1011 | } |
fd26970f | 1012 | } |
d66e34cd | 1013 | |
0200214b RM |
1014 | _exit (0); |
1015 | } | |
86d2c878 | 1016 | |
ba79d61b RM |
1017 | { |
1018 | /* Now we have all the objects loaded. Relocate them all except for | |
1019 | the dynamic linker itself. We do this in reverse order so that copy | |
1020 | relocs of earlier objects overwrite the data written by later | |
1021 | objects. We do not re-relocate the dynamic linker itself in this | |
1022 | loop because that could result in the GOT entries for functions we | |
1023 | call being changed, and that would break us. It is safe to relocate | |
1024 | the dynamic linker out of order because it has no copy relocs (we | |
1025 | know that because it is self-contained). */ | |
1026 | ||
ceb2d9aa | 1027 | struct link_map *l; |
c0fb8a56 | 1028 | int consider_profiling = _dl_profile != NULL; |
8b07d6a8 | 1029 | #ifndef HP_TIMING_NONAVAIL |
db276fa1 UD |
1030 | hp_timing_t start; |
1031 | hp_timing_t stop; | |
1032 | hp_timing_t add; | |
8b07d6a8 | 1033 | #endif |
c0fb8a56 UD |
1034 | |
1035 | /* If we are profiling we also must do lazy reloaction. */ | |
12b5b6b7 | 1036 | _dl_lazy |= consider_profiling; |
c0fb8a56 | 1037 | |
ba79d61b RM |
1038 | l = _dl_loaded; |
1039 | while (l->l_next) | |
1040 | l = l->l_next; | |
db276fa1 UD |
1041 | |
1042 | HP_TIMING_NOW (start); | |
ba79d61b RM |
1043 | do |
1044 | { | |
752a2a50 UD |
1045 | /* While we are at it, help the memory handling a bit. We have to |
1046 | mark some data structures as allocated with the fake malloc() | |
1047 | implementation in ld.so. */ | |
1048 | struct libname_list *lnp = l->l_libname->next; | |
1049 | ||
1050 | while (__builtin_expect (lnp != NULL, 0)) | |
1051 | { | |
1052 | lnp->dont_free = 1; | |
1053 | lnp = lnp->next; | |
1054 | } | |
1055 | ||
ba79d61b | 1056 | if (l != &_dl_rtld_map) |
12b5b6b7 | 1057 | _dl_relocate_object (l, l->l_scope, _dl_lazy, consider_profiling); |
be935610 | 1058 | |
ba79d61b | 1059 | l = l->l_prev; |
db276fa1 UD |
1060 | } |
1061 | while (l); | |
1062 | HP_TIMING_NOW (stop); | |
1063 | ||
1064 | HP_TIMING_DIFF (relocate_time, start, stop); | |
ba79d61b RM |
1065 | |
1066 | /* Do any necessary cleanups for the startup OS interface code. | |
1067 | We do these now so that no calls are made after rtld re-relocation | |
1068 | which might be resolved to different functions than we expect. | |
1069 | We cannot do this before relocating the other objects because | |
1070 | _dl_relocate_object might need to call `mprotect' for DT_TEXTREL. */ | |
1071 | _dl_sysdep_start_cleanup (); | |
1072 | ||
722c33bb UD |
1073 | /* Now enable profiling if needed. Like the previous call, |
1074 | this has to go here because the calls it makes should use the | |
1075 | rtld versions of the functions (particularly calloc()), but it | |
1076 | needs to have _dl_profile_map set up by the relocator. */ | |
db33f7d4 | 1077 | if (__builtin_expect (_dl_profile_map != NULL, 0)) |
722c33bb UD |
1078 | /* We must prepare the profiling. */ |
1079 | _dl_start_profile (_dl_profile_map, _dl_profile_output); | |
1080 | ||
1ca7cbcb | 1081 | if (_dl_rtld_map.l_opencount > 1) |
db276fa1 UD |
1082 | { |
1083 | /* There was an explicit ref to the dynamic linker as a shared lib. | |
1084 | Re-relocate ourselves with user-controlled symbol definitions. */ | |
1085 | HP_TIMING_NOW (start); | |
1086 | _dl_relocate_object (&_dl_rtld_map, _dl_loaded->l_scope, 0, 0); | |
1087 | HP_TIMING_NOW (stop); | |
1088 | HP_TIMING_DIFF (add, start, stop); | |
1089 | HP_TIMING_ACCUM_NT (relocate_time, add); | |
1090 | } | |
ba79d61b | 1091 | } |
ac16e905 | 1092 | |
be935610 UD |
1093 | /* Now set up the variable which helps the assembler startup code. */ |
1094 | _dl_main_searchlist = &_dl_loaded->l_searchlist; | |
1095 | _dl_global_scope[0] = &_dl_loaded->l_searchlist; | |
1096 | ||
604510f7 UD |
1097 | /* Safe the information about the original global scope list since |
1098 | we need it in the memory handling later. */ | |
1099 | _dl_initial_searchlist = *_dl_main_searchlist; | |
1100 | ||
4d6acc61 RM |
1101 | { |
1102 | /* Initialize _r_debug. */ | |
1103 | struct r_debug *r = _dl_debug_initialize (_dl_rtld_map.l_addr); | |
ceb2d9aa | 1104 | struct link_map *l; |
4d6acc61 RM |
1105 | |
1106 | l = _dl_loaded; | |
ec42724d RM |
1107 | |
1108 | #ifdef ELF_MACHINE_DEBUG_SETUP | |
1109 | ||
1110 | /* Some machines (e.g. MIPS) don't use DT_DEBUG in this way. */ | |
1111 | ||
1112 | ELF_MACHINE_DEBUG_SETUP (l, r); | |
1113 | ELF_MACHINE_DEBUG_SETUP (&_dl_rtld_map, r); | |
1114 | ||
1115 | #else | |
1116 | ||
4d6acc61 RM |
1117 | if (l->l_info[DT_DEBUG]) |
1118 | /* There is a DT_DEBUG entry in the dynamic section. Fill it in | |
1119 | with the run-time address of the r_debug structure */ | |
1120 | l->l_info[DT_DEBUG]->d_un.d_ptr = (ElfW(Addr)) r; | |
1121 | ||
d746b89c RM |
1122 | /* Fill in the pointer in the dynamic linker's own dynamic section, in |
1123 | case you run gdb on the dynamic linker directly. */ | |
1124 | if (_dl_rtld_map.l_info[DT_DEBUG]) | |
1125 | _dl_rtld_map.l_info[DT_DEBUG]->d_un.d_ptr = (ElfW(Addr)) r; | |
1126 | ||
ec42724d RM |
1127 | #endif |
1128 | ||
4d6acc61 RM |
1129 | /* Notify the debugger that all objects are now mapped in. */ |
1130 | r->r_state = RT_ADD; | |
1131 | _dl_debug_state (); | |
1132 | } | |
0200214b | 1133 | |
08cac4ac UD |
1134 | #ifndef MAP_COPY |
1135 | /* We must munmap() the cache file. */ | |
1136 | _dl_unload_cache (); | |
1137 | #endif | |
1138 | ||
d66e34cd RM |
1139 | /* Once we return, _dl_sysdep_start will invoke |
1140 | the DT_INIT functions and then *USER_ENTRY. */ | |
1141 | } | |
fd26970f UD |
1142 | \f |
1143 | /* This is a little helper function for resolving symbols while | |
1144 | tracing the binary. */ | |
1145 | static void | |
c84142e8 UD |
1146 | print_unresolved (int errcode __attribute__ ((unused)), const char *objname, |
1147 | const char *errstring) | |
fd26970f | 1148 | { |
3996f34b UD |
1149 | if (objname[0] == '\0') |
1150 | objname = _dl_argv[0] ?: "<main program>"; | |
35fc382a | 1151 | _dl_error_printf ("%s (%s)\n", errstring, objname); |
fd26970f | 1152 | } |
c84142e8 UD |
1153 | \f |
1154 | /* This is a little helper function for resolving symbols while | |
1155 | tracing the binary. */ | |
1156 | static void | |
1157 | print_missing_version (int errcode __attribute__ ((unused)), | |
1158 | const char *objname, const char *errstring) | |
1159 | { | |
35fc382a UD |
1160 | _dl_error_printf ("%s: %s: %s\n", _dl_argv[0] ?: "<program name unknown>", |
1161 | objname, errstring); | |
c84142e8 | 1162 | } |
ea278354 | 1163 | \f |
7dea968e UD |
1164 | /* Nonzero if any of the debugging options is enabled. */ |
1165 | static int any_debug; | |
1166 | ||
b5efde2f UD |
1167 | /* Process the string given as the parameter which explains which debugging |
1168 | options are enabled. */ | |
1169 | static void | |
14c44e2e | 1170 | process_dl_debug (const char *dl_debug) |
b5efde2f | 1171 | { |
3e2040c8 UD |
1172 | /* When adding new entries make sure that the maximal length of a name |
1173 | is correctly handled in the LD_DEBUG_HELP code below. */ | |
1174 | static const struct | |
1175 | { | |
1176 | const char name[11]; | |
1177 | const char helptext[41]; | |
1178 | unsigned short int mask; | |
1179 | } debopts[] = | |
1180 | { | |
1181 | { "libs", "display library search paths", | |
1182 | DL_DEBUG_LIBS | DL_DEBUG_IMPCALLS }, | |
1183 | { "reloc", "display relocation processing", | |
1184 | DL_DEBUG_RELOC | DL_DEBUG_IMPCALLS }, | |
1185 | { "files", "display progress for input file", | |
1186 | DL_DEBUG_FILES | DL_DEBUG_IMPCALLS }, | |
1187 | { "symbols", "display symbol table processing", | |
1188 | DL_DEBUG_SYMBOLS | DL_DEBUG_IMPCALLS }, | |
1189 | { "bindings", "display information about symbol binding", | |
1190 | DL_DEBUG_BINDINGS | DL_DEBUG_IMPCALLS }, | |
1191 | { "versions", "display version dependencies", | |
1192 | DL_DEBUG_VERSIONS | DL_DEBUG_IMPCALLS }, | |
1193 | { "all", "all previous options combined", | |
1194 | DL_DEBUG_LIBS | DL_DEBUG_RELOC | DL_DEBUG_FILES | DL_DEBUG_SYMBOLS | |
1195 | | DL_DEBUG_BINDINGS | DL_DEBUG_VERSIONS | DL_DEBUG_IMPCALLS }, | |
1196 | { "statistics", "display relocation statistics", | |
1197 | DL_DEBUG_STATISTICS }, | |
1198 | { "help", "display this help message and exit", | |
1199 | DL_DEBUG_HELP }, | |
1200 | }; | |
1201 | #define ndebopts (sizeof (debopts) / sizeof (debopts[0])) | |
14c44e2e | 1202 | size_t len; |
3e2040c8 | 1203 | |
14c44e2e | 1204 | #define separators " ,:" |
b5efde2f UD |
1205 | do |
1206 | { | |
14c44e2e | 1207 | len = 0; |
b5efde2f | 1208 | /* Skip separating white spaces and commas. */ |
14c44e2e | 1209 | dl_debug += strspn (dl_debug, separators); |
b5efde2f UD |
1210 | if (*dl_debug != '\0') |
1211 | { | |
3e2040c8 | 1212 | size_t cnt; |
77aba05b | 1213 | |
3e2040c8 | 1214 | len = strcspn (dl_debug, separators); |
14c44e2e | 1215 | |
3e2040c8 UD |
1216 | for (cnt = 0; cnt < ndebopts; ++cnt) |
1217 | if (strncmp (dl_debug, debopts[cnt].name, len) == 0 | |
1218 | && debopts[cnt].name[len] == '\0') | |
1219 | { | |
1220 | _dl_debug_mask |= debopts[cnt].mask; | |
1221 | break; | |
1222 | } | |
77aba05b | 1223 | |
3e2040c8 UD |
1224 | if (cnt == ndebopts) |
1225 | { | |
1226 | /* Display a warning and skip everything until next | |
1227 | separator. */ | |
1228 | char *copy = strndupa (dl_debug, len); | |
1229 | _dl_error_printf ("\ | |
1230 | warning: debug option `%s' unknown; try LD_DEBUG=help\n", copy); | |
14c44e2e | 1231 | break; |
3e2040c8 UD |
1232 | } |
1233 | } | |
1234 | } | |
1235 | while (*(dl_debug += len) != '\0'); | |
77aba05b | 1236 | |
3e2040c8 UD |
1237 | if (_dl_debug_mask & DL_DEBUG_HELP) |
1238 | { | |
1239 | size_t cnt; | |
14c44e2e | 1240 | |
3e2040c8 UD |
1241 | _dl_printf ("\ |
1242 | Valid options for the LD_DEBUG environment variable are:\n\n"); | |
db276fa1 | 1243 | |
3e2040c8 UD |
1244 | for (cnt = 0; cnt < ndebopts; ++cnt) |
1245 | _dl_printf (" %s%s %s\n", debopts[cnt].name, | |
1246 | " " + strlen (debopts[cnt].name) - 3, | |
1247 | debopts[cnt].helptext); | |
14c44e2e | 1248 | |
3e2040c8 UD |
1249 | _dl_printf ("\n\ |
1250 | To direct the debugging output into a file instead of standard output\n\ | |
1251 | a filename can be specified using the LD_DEBUG_OUTPUT environment variable.\n"); | |
1252 | _exit (0); | |
b5efde2f | 1253 | } |
b5efde2f UD |
1254 | } |
1255 | \f | |
ea278354 UD |
1256 | /* Process all environments variables the dynamic linker must recognize. |
1257 | Since all of them start with `LD_' we are a bit smarter while finding | |
1258 | all the entries. */ | |
67c94753 UD |
1259 | extern char **_environ; |
1260 | ||
ea278354 | 1261 | static void |
ba9fcb3f | 1262 | process_envvars (enum mode *modep) |
ea278354 | 1263 | { |
67c94753 | 1264 | char **runp = _environ; |
ea278354 UD |
1265 | char *envline; |
1266 | enum mode mode = normal; | |
7dea968e | 1267 | char *debug_output = NULL; |
ea278354 UD |
1268 | |
1269 | /* This is the default place for profiling data file. */ | |
3e2040c8 | 1270 | _dl_profile_output = &"/var/tmp\0/var/profile"[__libc_enable_secure ? 9 : 0]; |
ea278354 UD |
1271 | |
1272 | while ((envline = _dl_next_ld_env_entry (&runp)) != NULL) | |
1273 | { | |
75e8d1f5 | 1274 | size_t len = strcspn (envline, "="); |
ea278354 | 1275 | |
75e8d1f5 UD |
1276 | if (envline[len] != '=') |
1277 | /* This is a "LD_" variable at the end of the string without | |
1278 | a '=' character. Ignore it since otherwise we will access | |
1279 | invalid memory below. */ | |
67c94753 | 1280 | continue; |
75e8d1f5 | 1281 | |
67c94753 | 1282 | switch (len) |
ea278354 | 1283 | { |
14c44e2e UD |
1284 | case 4: |
1285 | /* Warning level, verbose or not. */ | |
67c94753 UD |
1286 | if (memcmp (envline, "WARN", 4) == 0) |
1287 | _dl_verbose = envline[5] != '\0'; | |
14c44e2e | 1288 | break; |
ea278354 | 1289 | |
14c44e2e UD |
1290 | case 5: |
1291 | /* Debugging of the dynamic linker? */ | |
67c94753 UD |
1292 | if (memcmp (envline, "DEBUG", 5) == 0) |
1293 | process_dl_debug (&envline[6]); | |
14c44e2e | 1294 | break; |
b5efde2f | 1295 | |
14c44e2e UD |
1296 | case 7: |
1297 | /* Print information about versions. */ | |
67c94753 | 1298 | if (memcmp (envline, "VERBOSE", 7) == 0) |
14c44e2e | 1299 | { |
67c94753 | 1300 | version_info = envline[8] != '\0'; |
14c44e2e UD |
1301 | break; |
1302 | } | |
7dea968e | 1303 | |
14c44e2e | 1304 | /* List of objects to be preloaded. */ |
67c94753 | 1305 | if (memcmp (envline, "PRELOAD", 7) == 0) |
14c44e2e | 1306 | { |
67c94753 | 1307 | preloadlist = &envline[8]; |
14c44e2e UD |
1308 | break; |
1309 | } | |
120b4c49 | 1310 | |
14c44e2e | 1311 | /* Which shared object shall be profiled. */ |
c95f3fd4 | 1312 | if (memcmp (envline, "PROFILE", 7) == 0 && envline[8] != '\0') |
67c94753 | 1313 | _dl_profile = &envline[8]; |
14c44e2e | 1314 | break; |
120b4c49 | 1315 | |
14c44e2e UD |
1316 | case 8: |
1317 | /* Do we bind early? */ | |
67c94753 | 1318 | if (memcmp (envline, "BIND_NOW", 8) == 0) |
f53c03c2 | 1319 | { |
67c94753 | 1320 | _dl_lazy = envline[9] == '\0'; |
f53c03c2 UD |
1321 | break; |
1322 | } | |
67c94753 UD |
1323 | if (memcmp (envline, "BIND_NOT", 8) == 0) |
1324 | _dl_bind_not = envline[9] != '\0'; | |
14c44e2e | 1325 | break; |
ea278354 | 1326 | |
14c44e2e UD |
1327 | case 9: |
1328 | /* Test whether we want to see the content of the auxiliary | |
1329 | array passed up from the kernel. */ | |
67c94753 | 1330 | if (memcmp (envline, "SHOW_AUXV", 9) == 0) |
14c44e2e UD |
1331 | _dl_show_auxv (); |
1332 | break; | |
ea278354 | 1333 | |
12264bd7 | 1334 | case 10: |
3081378b | 1335 | /* Mask for the important hardware capabilities. */ |
67c94753 UD |
1336 | if (memcmp (envline, "HWCAP_MASK", 10) == 0) |
1337 | _dl_hwcap_mask = __strtoul_internal (&envline[11], NULL, 0, 0); | |
12264bd7 UD |
1338 | break; |
1339 | ||
f787edde UD |
1340 | case 11: |
1341 | /* Path where the binary is found. */ | |
45769315 | 1342 | if (!__libc_enable_secure |
67c94753 UD |
1343 | && memcmp (envline, "ORIGIN_PATH", 11) == 0) |
1344 | _dl_origin_path = &envline[12]; | |
f787edde UD |
1345 | break; |
1346 | ||
14c44e2e | 1347 | case 12: |
dec126b4 | 1348 | /* The library search path. */ |
67c94753 | 1349 | if (memcmp (envline, "LIBRARY_PATH", 12) == 0) |
dec126b4 | 1350 | { |
67c94753 | 1351 | library_path = &envline[13]; |
dec126b4 UD |
1352 | break; |
1353 | } | |
1354 | ||
14c44e2e | 1355 | /* Where to place the profiling data file. */ |
67c94753 | 1356 | if (memcmp (envline, "DEBUG_OUTPUT", 12) == 0) |
14c44e2e | 1357 | { |
67c94753 | 1358 | debug_output = &envline[13]; |
14c44e2e UD |
1359 | break; |
1360 | } | |
ea278354 | 1361 | |
67c94753 | 1362 | if (memcmp (envline, "DYNAMIC_WEAK", 12) == 0) |
dec126b4 | 1363 | _dl_dynamic_weak = 1; |
14c44e2e | 1364 | break; |
ea278354 | 1365 | |
14c44e2e UD |
1366 | case 14: |
1367 | /* Where to place the profiling data file. */ | |
3081378b | 1368 | if (!__libc_enable_secure |
3e2040c8 UD |
1369 | && memcmp (envline, "PROFILE_OUTPUT", 14) == 0 |
1370 | && envline[15] != '\0') | |
1371 | _dl_profile_output = &envline[15]; | |
14c44e2e | 1372 | break; |
120b4c49 | 1373 | |
14c44e2e UD |
1374 | case 20: |
1375 | /* The mode of the dynamic linker can be set. */ | |
67c94753 | 1376 | if (memcmp (envline, "TRACE_LOADED_OBJECTS", 20) == 0) |
14c44e2e UD |
1377 | mode = trace; |
1378 | break; | |
e2102c14 UD |
1379 | |
1380 | /* We might have some extra environment variable to handle. This | |
1381 | is tricky due to the pre-processing of the length of the name | |
1382 | in the switch statement here. The code here assumes that added | |
1383 | environment variables have a different length. */ | |
1384 | #ifdef EXTRA_LD_ENVVARS | |
1385 | EXTRA_LD_ENVVARS | |
1386 | #endif | |
ea278354 UD |
1387 | } |
1388 | } | |
1389 | ||
3e2040c8 UD |
1390 | /* The caller wants this information. */ |
1391 | *modep = mode; | |
1392 | ||
4bae5567 UD |
1393 | /* Extra security for SUID binaries. Remove all dangerous environment |
1394 | variables. */ | |
ba9fcb3f | 1395 | if (__builtin_expect (__libc_enable_secure, 0)) |
4bae5567 | 1396 | { |
c95f3fd4 | 1397 | static const char unsecure_envvars[] = |
4bae5567 UD |
1398 | #ifdef EXTRA_UNSECURE_ENVVARS |
1399 | EXTRA_UNSECURE_ENVVARS | |
1400 | #endif | |
c95f3fd4 UD |
1401 | UNSECURE_ENVVARS; |
1402 | const char *nextp; | |
1403 | ||
1404 | nextp = unsecure_envvars; | |
1405 | do | |
1406 | { | |
1407 | unsetenv (nextp); | |
1408 | nextp = (char *) rawmemchr (nextp, '\0') + 1; | |
1409 | } | |
1410 | while (*nextp != '\0'); | |
74955460 UD |
1411 | |
1412 | if (__access ("/etc/suid-debug", F_OK) != 0) | |
1413 | unsetenv ("MALLOC_CHECK_"); | |
4bae5567 | 1414 | } |
7dea968e UD |
1415 | /* If we have to run the dynamic linker in debugging mode and the |
1416 | LD_DEBUG_OUTPUT environment variable is given, we write the debug | |
1417 | messages to this file. */ | |
3e2040c8 | 1418 | else if (any_debug && debug_output != NULL) |
7dea968e | 1419 | { |
5f2de337 UD |
1420 | #ifdef O_NOFOLLOW |
1421 | const int flags = O_WRONLY | O_APPEND | O_CREAT | O_NOFOLLOW; | |
1422 | #else | |
1423 | const int flags = O_WRONLY | O_APPEND | O_CREAT; | |
1424 | #endif | |
7a2fd787 UD |
1425 | size_t name_len = strlen (debug_output); |
1426 | char buf[name_len + 12]; | |
1427 | char *startp; | |
1428 | ||
1429 | buf[name_len + 11] = '\0'; | |
1430 | startp = _itoa_word (__getpid (), &buf[name_len + 11], 10, 0); | |
1431 | *--startp = '.'; | |
1432 | startp = memcpy (startp - name_len, debug_output, name_len); | |
1433 | ||
ba9fcb3f | 1434 | _dl_debug_fd = __open (startp, flags, DEFFILEMODE); |
7dea968e UD |
1435 | if (_dl_debug_fd == -1) |
1436 | /* We use standard output if opening the file failed. */ | |
1437 | _dl_debug_fd = STDOUT_FILENO; | |
1438 | } | |
ea278354 | 1439 | } |
db276fa1 UD |
1440 | |
1441 | ||
1442 | /* Print the various times we collected. */ | |
1443 | static void | |
1444 | print_statistics (void) | |
1445 | { | |
8b07d6a8 | 1446 | #ifndef HP_TIMING_NONAVAIL |
f457369d | 1447 | char buf[200]; |
db276fa1 UD |
1448 | char *cp; |
1449 | char *wp; | |
1450 | ||
1451 | /* Total time rtld used. */ | |
1452 | if (HP_TIMING_AVAIL) | |
1453 | { | |
1454 | HP_TIMING_PRINT (buf, sizeof (buf), rtld_total_time); | |
35fc382a UD |
1455 | _dl_debug_printf ("\nruntime linker statistics:\n" |
1456 | " total startup time in dynamic loader: %s\n", buf); | |
db276fa1 UD |
1457 | } |
1458 | ||
1459 | /* Print relocation statistics. */ | |
1460 | if (HP_TIMING_AVAIL) | |
1461 | { | |
35fc382a | 1462 | char pbuf[30]; |
db276fa1 | 1463 | HP_TIMING_PRINT (buf, sizeof (buf), relocate_time); |
eaad82e0 | 1464 | cp = _itoa_word ((1000ULL * relocate_time) / rtld_total_time, |
35fc382a UD |
1465 | pbuf + sizeof (pbuf), 10, 0); |
1466 | wp = pbuf; | |
1467 | switch (pbuf + sizeof (pbuf) - cp) | |
db276fa1 UD |
1468 | { |
1469 | case 3: | |
1470 | *wp++ = *cp++; | |
1471 | case 2: | |
1472 | *wp++ = *cp++; | |
1473 | case 1: | |
1474 | *wp++ = '.'; | |
1475 | *wp++ = *cp++; | |
1476 | } | |
1477 | *wp = '\0'; | |
cf44e2dd | 1478 | _dl_debug_printf (" time needed for relocation: %s (%s%%)\n", |
35fc382a | 1479 | buf, pbuf); |
db276fa1 | 1480 | } |
1531e094 | 1481 | #endif |
35fc382a UD |
1482 | _dl_debug_printf (" number of relocations: %lu\n", |
1483 | _dl_num_relocations); | |
962a3cdd | 1484 | _dl_debug_printf (" number of relocations from cache: %lu\n", |
647eb037 | 1485 | _dl_num_cache_relocations); |
db276fa1 | 1486 | |
1531e094 | 1487 | #ifndef HP_TIMING_NONAVAIL |
db276fa1 UD |
1488 | /* Time spend while loading the object and the dependencies. */ |
1489 | if (HP_TIMING_AVAIL) | |
1490 | { | |
35fc382a | 1491 | char pbuf[30]; |
db276fa1 | 1492 | HP_TIMING_PRINT (buf, sizeof (buf), load_time); |
eaad82e0 | 1493 | cp = _itoa_word ((1000ULL * load_time) / rtld_total_time, |
35fc382a UD |
1494 | pbuf + sizeof (pbuf), 10, 0); |
1495 | wp = pbuf; | |
1496 | switch (pbuf + sizeof (pbuf) - cp) | |
db276fa1 UD |
1497 | { |
1498 | case 3: | |
1499 | *wp++ = *cp++; | |
1500 | case 2: | |
1501 | *wp++ = *cp++; | |
1502 | case 1: | |
1503 | *wp++ = '.'; | |
1504 | *wp++ = *cp++; | |
1505 | } | |
1506 | *wp = '\0'; | |
cf44e2dd | 1507 | _dl_debug_printf (" time needed to load objects: %s (%s%%)\n", |
35fc382a | 1508 | buf, pbuf); |
db276fa1 | 1509 | } |
1531e094 | 1510 | #endif |
db276fa1 | 1511 | } |