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d66e34cd | 1 | /* Run time dynamic linker. |
1ca7cbcb | 2 | Copyright (C) 1995-1999, 2000 Free Software Foundation, Inc. |
afd4eb37 | 3 | This file is part of the GNU C Library. |
d66e34cd | 4 | |
afd4eb37 UD |
5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Library General Public License as | |
7 | published by the Free Software Foundation; either version 2 of the | |
8 | License, or (at your option) any later version. | |
d66e34cd | 9 | |
afd4eb37 UD |
10 | The GNU C Library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Library General Public License for more details. | |
d66e34cd | 14 | |
afd4eb37 UD |
15 | You should have received a copy of the GNU Library General Public |
16 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
17 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
18 | Boston, MA 02111-1307, USA. */ | |
d66e34cd | 19 | |
7dea968e | 20 | #include <fcntl.h> |
d66e34cd | 21 | #include <stdlib.h> |
f51d1dfd | 22 | #include <string.h> |
d66e34cd | 23 | #include <unistd.h> |
2064087b | 24 | #include <sys/mman.h> /* Check if MAP_ANON is defined. */ |
a42195db | 25 | #include <ldsodefs.h> |
ce37fa88 | 26 | #include <stdio-common/_itoa.h> |
f21acc89 | 27 | #include <entry.h> |
c94a8080 | 28 | #include <fpu_control.h> |
db276fa1 | 29 | #include <hp-timing.h> |
cf197e41 | 30 | #include <bits/libc-lock.h> |
f5348425 | 31 | #include "dynamic-link.h" |
e2102c14 | 32 | #include "dl-librecon.h" |
74955460 | 33 | #include <unsecvars.h> |
f5348425 | 34 | |
a853022c | 35 | #include <assert.h> |
f5348425 | 36 | |
d66e34cd RM |
37 | /* System-specific function to do initial startup for the dynamic linker. |
38 | After this, file access calls and getenv must work. This is responsible | |
cddcfecf | 39 | for setting __libc_enable_secure if we need to be secure (e.g. setuid), |
d66e34cd | 40 | and for setting _dl_argc and _dl_argv, and then calling _dl_main. */ |
266180eb RM |
41 | extern ElfW(Addr) _dl_sysdep_start (void **start_argptr, |
42 | void (*dl_main) (const ElfW(Phdr) *phdr, | |
43 | ElfW(Half) phent, | |
44 | ElfW(Addr) *user_entry)); | |
4cb20290 | 45 | extern void _dl_sysdep_start_cleanup (void); |
d66e34cd | 46 | |
08cac4ac UD |
47 | /* This function is used to unload the cache file if necessary. */ |
48 | extern void _dl_unload_cache (void); | |
49 | ||
14bab8de UD |
50 | /* System-dependent function to read a file's whole contents |
51 | in the most convenient manner available. */ | |
52 | extern void *_dl_sysdep_read_whole_file (const char *filename, | |
53 | size_t *filesize_ptr, | |
54 | int mmap_prot); | |
55 | ||
fd26970f | 56 | /* Helper function to handle errors while resolving symbols. */ |
c84142e8 UD |
57 | static void print_unresolved (int errcode, const char *objname, |
58 | const char *errsting); | |
59 | ||
60 | /* Helper function to handle errors when a version is missing. */ | |
61 | static void print_missing_version (int errcode, const char *objname, | |
62 | const char *errsting); | |
fd26970f | 63 | |
db276fa1 UD |
64 | /* Print the various times we collected. */ |
65 | static void print_statistics (void); | |
ea278354 UD |
66 | |
67 | /* This is a list of all the modes the dynamic loader can be in. */ | |
68 | enum mode { normal, list, verify, trace }; | |
69 | ||
70 | /* Process all environments variables the dynamic linker must recognize. | |
71 | Since all of them start with `LD_' we are a bit smarter while finding | |
72 | all the entries. */ | |
73 | static void process_envvars (enum mode *modep, int *lazyp); | |
74 | ||
d66e34cd RM |
75 | int _dl_argc; |
76 | char **_dl_argv; | |
ceb27555 | 77 | unsigned int _dl_skip_args; /* Nonzero if we were run directly. */ |
cf29ffbe | 78 | int _dl_verbose; |
0a54e401 UD |
79 | const char *_dl_platform; |
80 | size_t _dl_platformlen; | |
f41c8091 | 81 | unsigned long _dl_hwcap; |
c94a8080 | 82 | fpu_control_t _dl_fpu_control = _FPU_DEFAULT; |
0a54e401 | 83 | struct r_search_path *_dl_search_paths; |
3996f34b UD |
84 | const char *_dl_profile; |
85 | const char *_dl_profile_output; | |
a3d6fb9b | 86 | struct link_map *_dl_profile_map; |
12b5b6b7 | 87 | int _dl_lazy; |
8a0e201e UD |
88 | /* XXX I know about at least one case where we depend on the old weak |
89 | behavior (it has to do with librt). Until we get DSO groups implemented | |
90 | we have to make this the default. Bummer. --drepper */ | |
91 | #if 0 | |
dec126b4 | 92 | int _dl_dynamic_weak; |
8a0e201e UD |
93 | #else |
94 | int _dl_dynamic_weak = 1; | |
95 | #endif | |
b5efde2f | 96 | int _dl_debug_libs; |
7dea968e | 97 | int _dl_debug_impcalls; |
0c367d92 | 98 | int _dl_debug_bindings; |
de100ca7 | 99 | int _dl_debug_symbols; |
8193034b UD |
100 | int _dl_debug_versions; |
101 | int _dl_debug_reloc; | |
102 | int _dl_debug_files; | |
db276fa1 | 103 | int _dl_debug_statistics; |
b0a01055 | 104 | const char *_dl_inhibit_rpath; /* RPATH values which should be |
310930c1 | 105 | ignored. */ |
f787edde | 106 | const char *_dl_origin_path; |
f53c03c2 | 107 | int _dl_bind_not; |
d66e34cd | 108 | |
be935610 UD |
109 | /* This is a pointer to the map for the main object and through it to |
110 | all loaded objects. */ | |
111 | struct link_map *_dl_loaded; | |
1ebba33e UD |
112 | /* Number of object in the _dl_loaded list. */ |
113 | unsigned int _dl_nloaded; | |
be935610 UD |
114 | /* Pointer to the l_searchlist element of the link map of the main object. */ |
115 | struct r_scope_elem *_dl_main_searchlist; | |
604510f7 UD |
116 | /* Copy of the content of `_dl_main_searchlist'. */ |
117 | struct r_scope_elem _dl_initial_searchlist; | |
be935610 UD |
118 | /* Array which is used when looking up in the global scope. */ |
119 | struct r_scope_elem *_dl_global_scope[2]; | |
120 | ||
cf197e41 UD |
121 | /* During the program run we must not modify the global data of |
122 | loaded shared object simultanously in two threads. Therefore we | |
123 | protect `_dl_open' and `_dl_close' in dl-close.c. | |
124 | ||
125 | This must be a recursive lock since the initializer function of | |
126 | the loaded object might as well require a call to this function. | |
127 | At this time it is not anymore a problem to modify the tables. */ | |
128 | __libc_lock_define_initialized_recursive (, _dl_load_lock) | |
129 | ||
39778c6c UD |
130 | /* Set nonzero during loading and initialization of executable and |
131 | libraries, cleared before the executable's entry point runs. This | |
132 | must not be initialized to nonzero, because the unused dynamic | |
133 | linker loaded in for libc.so's "ld.so.1" dep will provide the | |
134 | definition seen by libc.so's initializer; that value must be zero, | |
135 | and will be since that dynamic linker's _dl_start and dl_main will | |
136 | never be called. */ | |
137 | int _dl_starting_up; | |
138 | ||
c0fb8a56 | 139 | |
266180eb RM |
140 | static void dl_main (const ElfW(Phdr) *phdr, |
141 | ElfW(Half) phent, | |
142 | ElfW(Addr) *user_entry); | |
d66e34cd | 143 | |
ee188d55 | 144 | struct link_map _dl_rtld_map; |
c84142e8 | 145 | struct libname_list _dl_rtld_libname; |
f41c8091 | 146 | struct libname_list _dl_rtld_libname2; |
86d2c878 | 147 | |
db276fa1 | 148 | /* Variable for statistics. */ |
5732c4df | 149 | #ifndef HP_TIMING_NONAVAIL |
db276fa1 UD |
150 | static hp_timing_t rtld_total_time; |
151 | static hp_timing_t relocate_time; | |
152 | static hp_timing_t load_time; | |
5732c4df | 153 | #endif |
db276fa1 UD |
154 | extern unsigned long int _dl_num_relocations; /* in dl-lookup.c */ |
155 | ||
6a1db4ff UD |
156 | static ElfW(Addr) _dl_start_final (void *arg, struct link_map *bootstrap_map_p, |
157 | hp_timing_t start_time); | |
158 | ||
b1dbbaa4 RM |
159 | #ifdef RTLD_START |
160 | RTLD_START | |
161 | #else | |
162 | #error "sysdeps/MACHINE/dl-machine.h fails to define RTLD_START" | |
163 | #endif | |
164 | ||
ceb2d9aa | 165 | static ElfW(Addr) |
d66e34cd RM |
166 | _dl_start (void *arg) |
167 | { | |
86d2c878 | 168 | struct link_map bootstrap_map; |
db276fa1 | 169 | hp_timing_t start_time; |
264ec183 | 170 | size_t cnt; |
d66e34cd | 171 | |
b1dbbaa4 RM |
172 | /* This #define produces dynamic linking inline functions for |
173 | bootstrap relocation instead of general-purpose relocation. */ | |
174 | #define RTLD_BOOTSTRAP | |
c0282c06 UD |
175 | #define RESOLVE_MAP(sym, version, flags) \ |
176 | ((*(sym))->st_shndx == SHN_UNDEF ? 0 : &bootstrap_map) | |
50463d27 UD |
177 | #define RESOLVE(sym, version, flags) \ |
178 | ((*(sym))->st_shndx == SHN_UNDEF ? 0 : bootstrap_map.l_addr) | |
b1dbbaa4 RM |
179 | #include "dynamic-link.h" |
180 | ||
db276fa1 UD |
181 | if (HP_TIMING_INLINE && HP_TIMING_AVAIL) |
182 | HP_TIMING_NOW (start_time); | |
183 | ||
264ec183 UD |
184 | /* Partly clean the `bootstrap_map' structure up. Don't use `memset' |
185 | since it might nor be built in or inlined and we cannot make function | |
186 | calls at this point. */ | |
187 | for (cnt = 0; | |
188 | cnt < sizeof (bootstrap_map.l_info) / sizeof (bootstrap_map.l_info[0]); | |
189 | ++cnt) | |
190 | bootstrap_map.l_info[cnt] = 0; | |
191 | ||
d66e34cd | 192 | /* Figure out the run-time load address of the dynamic linker itself. */ |
86d2c878 | 193 | bootstrap_map.l_addr = elf_machine_load_address (); |
d66e34cd | 194 | |
47707456 UD |
195 | /* Read our own dynamic section and fill in the info array. */ |
196 | bootstrap_map.l_ld = (void *) bootstrap_map.l_addr + elf_machine_dynamic (); | |
d3ac2d47 | 197 | elf_get_dynamic_info (&bootstrap_map); |
d66e34cd RM |
198 | |
199 | #ifdef ELF_MACHINE_BEFORE_RTLD_RELOC | |
86d2c878 | 200 | ELF_MACHINE_BEFORE_RTLD_RELOC (bootstrap_map.l_info); |
d66e34cd RM |
201 | #endif |
202 | ||
203 | /* Relocate ourselves so we can do normal function calls and | |
204 | data access using the global offset table. */ | |
421f82e5 | 205 | |
3996f34b | 206 | ELF_DYNAMIC_RELOCATE (&bootstrap_map, 0, 0); |
ea7eb7e3 UD |
207 | /* Please note that we don't allow profiling of this object and |
208 | therefore need not test whether we have to allocate the array | |
209 | for the relocation results (as done in dl-reloc.c). */ | |
421f82e5 | 210 | |
d66e34cd RM |
211 | /* Now life is sane; we can call functions and access global data. |
212 | Set up to use the operating system facilities, and find out from | |
213 | the operating system's program loader where to find the program | |
6a1db4ff UD |
214 | header table in core. Put the rest of _dl_start into a separate |
215 | function, that way the compiler cannot put accesses to the GOT | |
216 | before ELF_DYNAMIC_RELOCATE. */ | |
c0282c06 UD |
217 | { |
218 | ElfW(Addr) entry = _dl_start_final (arg, &bootstrap_map, start_time); | |
219 | ||
220 | #ifndef ELF_MACHINE_START_ADDRESS | |
221 | # define ELF_MACHINE_START_ADDRESS(map, start) (start) | |
222 | #endif | |
223 | ||
224 | return ELF_MACHINE_START_ADDRESS (_dl_loaded, entry); | |
225 | } | |
6a1db4ff UD |
226 | } |
227 | ||
228 | ||
229 | static ElfW(Addr) | |
230 | _dl_start_final (void *arg, struct link_map *bootstrap_map_p, | |
231 | hp_timing_t start_time) | |
232 | { | |
233 | /* The use of `alloca' here looks ridiculous but it helps. The goal | |
234 | is to avoid the function from being inlined. There is no official | |
235 | way to do this so we use this trick. gcc never inlines functions | |
236 | which use `alloca'. */ | |
237 | ElfW(Addr) *start_addr = alloca (sizeof (ElfW(Addr))); | |
d66e34cd | 238 | |
db276fa1 UD |
239 | if (HP_TIMING_AVAIL) |
240 | { | |
241 | /* If it hasn't happen yet record the startup time. */ | |
242 | if (! HP_TIMING_INLINE) | |
243 | HP_TIMING_NOW (start_time); | |
244 | ||
245 | /* Initialize the timing functions. */ | |
246 | HP_TIMING_DIFF_INIT (); | |
247 | } | |
248 | ||
86d2c878 | 249 | /* Transfer data about ourselves to the permanent link_map structure. */ |
6a1db4ff UD |
250 | _dl_rtld_map.l_addr = bootstrap_map_p->l_addr; |
251 | _dl_rtld_map.l_ld = bootstrap_map_p->l_ld; | |
f41c8091 | 252 | _dl_rtld_map.l_opencount = 1; |
6a1db4ff | 253 | memcpy (_dl_rtld_map.l_info, bootstrap_map_p->l_info, |
ee188d55 RM |
254 | sizeof _dl_rtld_map.l_info); |
255 | _dl_setup_hash (&_dl_rtld_map); | |
86d2c878 | 256 | |
052b6a6c UD |
257 | /* Don't bother trying to work out how ld.so is mapped in memory. */ |
258 | _dl_rtld_map.l_map_start = ~0; | |
259 | _dl_rtld_map.l_map_end = ~0; | |
260 | ||
d66e34cd RM |
261 | /* Call the OS-dependent function to set up life so we can do things like |
262 | file access. It will call `dl_main' (below) to do all the real work | |
263 | of the dynamic linker, and then unwind our frame and run the user | |
264 | entry point on the same stack we entered on. */ | |
6a1db4ff | 265 | *start_addr = _dl_sysdep_start (arg, &dl_main); |
8b07d6a8 | 266 | #ifndef HP_TIMING_NONAVAIL |
db276fa1 UD |
267 | if (HP_TIMING_AVAIL) |
268 | { | |
269 | hp_timing_t end_time; | |
270 | ||
271 | /* Get the current time. */ | |
272 | HP_TIMING_NOW (end_time); | |
273 | ||
274 | /* Compute the difference. */ | |
275 | HP_TIMING_DIFF (rtld_total_time, start_time, end_time); | |
276 | } | |
8b07d6a8 | 277 | #endif |
db276fa1 | 278 | |
466a0ec9 | 279 | if (__builtin_expect (_dl_debug_statistics, 0)) |
db276fa1 UD |
280 | print_statistics (); |
281 | ||
6a1db4ff | 282 | return *start_addr; |
d66e34cd RM |
283 | } |
284 | ||
d66e34cd RM |
285 | /* Now life is peachy; we can do all normal operations. |
286 | On to the real work. */ | |
287 | ||
f21acc89 | 288 | void ENTRY_POINT (void); |
d66e34cd | 289 | |
993b3242 UD |
290 | /* Some helper functions. */ |
291 | ||
292 | /* Arguments to relocate_doit. */ | |
293 | struct relocate_args | |
294 | { | |
295 | struct link_map *l; | |
296 | int lazy; | |
297 | }; | |
298 | ||
299 | struct map_args | |
300 | { | |
301 | /* Argument to map_doit. */ | |
302 | char *str; | |
303 | /* Return value of map_doit. */ | |
304 | struct link_map *main_map; | |
305 | }; | |
306 | ||
307 | /* Arguments to version_check_doit. */ | |
308 | struct version_check_args | |
309 | { | |
993b3242 | 310 | int doexit; |
145b8413 | 311 | int dotrace; |
993b3242 UD |
312 | }; |
313 | ||
314 | static void | |
315 | relocate_doit (void *a) | |
316 | { | |
317 | struct relocate_args *args = (struct relocate_args *) a; | |
318 | ||
be935610 | 319 | _dl_relocate_object (args->l, args->l->l_scope, |
c0fb8a56 | 320 | args->lazy, 0); |
993b3242 UD |
321 | } |
322 | ||
323 | static void | |
324 | map_doit (void *a) | |
325 | { | |
be935610 | 326 | struct map_args *args = (struct map_args *) a; |
bf8b3e74 | 327 | args->main_map = _dl_map_object (NULL, args->str, 0, lt_library, 0, 0); |
993b3242 UD |
328 | } |
329 | ||
330 | static void | |
331 | version_check_doit (void *a) | |
332 | { | |
be935610 | 333 | struct version_check_args *args = (struct version_check_args *) a; |
145b8413 | 334 | if (_dl_check_all_versions (_dl_loaded, 1, args->dotrace) && args->doexit) |
993b3242 UD |
335 | /* We cannot start the application. Abort now. */ |
336 | _exit (1); | |
337 | } | |
338 | ||
ce37fa88 UD |
339 | |
340 | static inline struct link_map * | |
341 | find_needed (const char *name) | |
342 | { | |
be935610 | 343 | unsigned int n = _dl_loaded->l_searchlist.r_nlist; |
ce37fa88 | 344 | |
be935610 UD |
345 | while (n-- > 0) |
346 | if (_dl_name_match_p (name, _dl_loaded->l_searchlist.r_list[n])) | |
347 | return _dl_loaded->l_searchlist.r_list[n]; | |
ce37fa88 UD |
348 | |
349 | /* Should never happen. */ | |
350 | return NULL; | |
351 | } | |
352 | ||
353 | static int | |
354 | match_version (const char *string, struct link_map *map) | |
355 | { | |
a42195db | 356 | const char *strtab = (const void *) D_PTR (map, l_info[DT_STRTAB]); |
ce37fa88 UD |
357 | ElfW(Verdef) *def; |
358 | ||
b0982c4a | 359 | #define VERDEFTAG (DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGIDX (DT_VERDEF)) |
ce37fa88 UD |
360 | if (map->l_info[VERDEFTAG] == NULL) |
361 | /* The file has no symbol versioning. */ | |
362 | return 0; | |
363 | ||
364 | def = (ElfW(Verdef) *) ((char *) map->l_addr | |
365 | + map->l_info[VERDEFTAG]->d_un.d_ptr); | |
366 | while (1) | |
367 | { | |
368 | ElfW(Verdaux) *aux = (ElfW(Verdaux) *) ((char *) def + def->vd_aux); | |
369 | ||
370 | /* Compare the version strings. */ | |
371 | if (strcmp (string, strtab + aux->vda_name) == 0) | |
372 | /* Bingo! */ | |
373 | return 1; | |
374 | ||
375 | /* If no more definitions we failed to find what we want. */ | |
376 | if (def->vd_next == 0) | |
377 | break; | |
378 | ||
379 | /* Next definition. */ | |
380 | def = (ElfW(Verdef) *) ((char *) def + def->vd_next); | |
381 | } | |
382 | ||
383 | return 0; | |
384 | } | |
385 | ||
120b4c49 UD |
386 | static const char *library_path; /* The library search path. */ |
387 | static const char *preloadlist; /* The list preloaded objects. */ | |
388 | static int version_info; /* Nonzero if information about | |
389 | versions has to be printed. */ | |
a1a9d215 | 390 | |
d66e34cd | 391 | static void |
266180eb RM |
392 | dl_main (const ElfW(Phdr) *phdr, |
393 | ElfW(Half) phent, | |
394 | ElfW(Addr) *user_entry) | |
d66e34cd | 395 | { |
266180eb | 396 | const ElfW(Phdr) *ph; |
ea278354 | 397 | enum mode mode; |
2064087b RM |
398 | struct link_map **preloads; |
399 | unsigned int npreloads; | |
14bab8de UD |
400 | size_t file_size; |
401 | char *file; | |
2f6d1f1b | 402 | int has_interp = 0; |
77aba05b | 403 | unsigned int i; |
9a51759b | 404 | int rtld_is_main = 0; |
5732c4df | 405 | #ifndef HP_TIMING_NONAVAIL |
db276fa1 UD |
406 | hp_timing_t start; |
407 | hp_timing_t stop; | |
408 | hp_timing_t diff; | |
5732c4df | 409 | #endif |
d66e34cd | 410 | |
ea278354 | 411 | /* Process the environment variable which control the behaviour. */ |
12b5b6b7 | 412 | process_envvars (&mode, &_dl_lazy); |
3996f34b | 413 | |
46ec036d UD |
414 | /* Set up a flag which tells we are just starting. */ |
415 | _dl_starting_up = 1; | |
416 | ||
f21acc89 | 417 | if (*user_entry == (ElfW(Addr)) &ENTRY_POINT) |
0200214b RM |
418 | { |
419 | /* Ho ho. We are not the program interpreter! We are the program | |
420 | itself! This means someone ran ld.so as a command. Well, that | |
421 | might be convenient to do sometimes. We support it by | |
422 | interpreting the args like this: | |
423 | ||
424 | ld.so PROGRAM ARGS... | |
425 | ||
426 | The first argument is the name of a file containing an ELF | |
427 | executable we will load and run with the following arguments. | |
428 | To simplify life here, PROGRAM is searched for using the | |
429 | normal rules for shared objects, rather than $PATH or anything | |
430 | like that. We just load it and use its entry point; we don't | |
431 | pay attention to its PT_INTERP command (we are the interpreter | |
432 | ourselves). This is an easy way to test a new ld.so before | |
433 | installing it. */ | |
9a51759b | 434 | rtld_is_main = 1; |
421f82e5 | 435 | |
ffee1316 RM |
436 | /* Note the place where the dynamic linker actually came from. */ |
437 | _dl_rtld_map.l_name = _dl_argv[0]; | |
6a76c115 | 438 | |
fd26970f UD |
439 | while (_dl_argc > 1) |
440 | if (! strcmp (_dl_argv[1], "--list")) | |
441 | { | |
442 | mode = list; | |
12b5b6b7 | 443 | _dl_lazy = -1; /* This means do no dependency analysis. */ |
61965e9b | 444 | |
fd26970f UD |
445 | ++_dl_skip_args; |
446 | --_dl_argc; | |
447 | ++_dl_argv; | |
448 | } | |
449 | else if (! strcmp (_dl_argv[1], "--verify")) | |
450 | { | |
451 | mode = verify; | |
6a76c115 | 452 | |
fd26970f UD |
453 | ++_dl_skip_args; |
454 | --_dl_argc; | |
455 | ++_dl_argv; | |
456 | } | |
310930c1 | 457 | else if (! strcmp (_dl_argv[1], "--library-path") && _dl_argc > 2) |
880f421f UD |
458 | { |
459 | library_path = _dl_argv[2]; | |
460 | ||
310930c1 UD |
461 | _dl_skip_args += 2; |
462 | _dl_argc -= 2; | |
463 | _dl_argv += 2; | |
464 | } | |
b0a01055 | 465 | else if (! strcmp (_dl_argv[1], "--inhibit-rpath") && _dl_argc > 2) |
310930c1 | 466 | { |
b0a01055 | 467 | _dl_inhibit_rpath = _dl_argv[2]; |
310930c1 | 468 | |
880f421f UD |
469 | _dl_skip_args += 2; |
470 | _dl_argc -= 2; | |
471 | _dl_argv += 2; | |
472 | } | |
fd26970f UD |
473 | else |
474 | break; | |
d66e34cd | 475 | |
61eb22d3 UD |
476 | /* If we have no further argument the program was called incorrectly. |
477 | Grant the user some education. */ | |
478 | if (_dl_argc < 2) | |
479 | _dl_sysdep_fatal ("\ | |
2bcf29ba | 480 | Usage: ld.so [OPTION]... EXECUTABLE-FILE [ARGS-FOR-PROGRAM...]\n\ |
61eb22d3 UD |
481 | You have invoked `ld.so', the helper program for shared library executables.\n\ |
482 | This program usually lives in the file `/lib/ld.so', and special directives\n\ | |
483 | in executable files using ELF shared libraries tell the system's program\n\ | |
484 | loader to load the helper program from this file. This helper program loads\n\ | |
485 | the shared libraries needed by the program executable, prepares the program\n\ | |
486 | to run, and runs it. You may invoke this helper program directly from the\n\ | |
487 | command line to load and run an ELF executable file; this is like executing\n\ | |
488 | that file itself, but always uses this helper program from the file you\n\ | |
489 | specified, instead of the helper program file specified in the executable\n\ | |
490 | file you run. This is mostly of use for maintainers to test new versions\n\ | |
2bcf29ba UD |
491 | of this helper program; chances are you did not intend to run this program.\n\ |
492 | \n\ | |
b0a01055 UD |
493 | --list list all dependencies and how they are resolved\n\ |
494 | --verify verify that given object really is a dynamically linked\n\ | |
e8b1163e | 495 | object we can handle\n\ |
b0a01055 UD |
496 | --library-path PATH use given PATH instead of content of the environment\n\ |
497 | variable LD_LIBRARY_PATH\n\ | |
fcf70d41 UD |
498 | --inhibit-rpath LIST ignore RUNPATH and RPATH information in object names\n\ |
499 | in LIST\n", | |
61eb22d3 UD |
500 | NULL); |
501 | ||
0200214b RM |
502 | ++_dl_skip_args; |
503 | --_dl_argc; | |
504 | ++_dl_argv; | |
91f62ce6 | 505 | |
da832465 UD |
506 | /* Initialize the data structures for the search paths for shared |
507 | objects. */ | |
508 | _dl_init_paths (library_path); | |
509 | ||
9a821cf9 | 510 | if (__builtin_expect (mode, normal) == verify) |
2de99474 | 511 | { |
8e17ea58 UD |
512 | const char *objname; |
513 | const char *err_str = NULL; | |
993b3242 | 514 | struct map_args args; |
2de99474 | 515 | |
993b3242 | 516 | args.str = _dl_argv[0]; |
8e17ea58 UD |
517 | (void) _dl_catch_error (&objname, &err_str, map_doit, &args); |
518 | if (__builtin_expect (err_str != NULL, 0)) | |
dcf0671d | 519 | { |
ca3c0135 UD |
520 | if (err_str != _dl_out_of_memory) |
521 | free ((char *) err_str); | |
dcf0671d UD |
522 | _exit (EXIT_FAILURE); |
523 | } | |
2de99474 UD |
524 | } |
525 | else | |
db276fa1 UD |
526 | { |
527 | HP_TIMING_NOW (start); | |
bf8b3e74 | 528 | _dl_map_object (NULL, _dl_argv[0], 0, lt_library, 0, 0); |
db276fa1 | 529 | HP_TIMING_NOW (stop); |
61e0617a | 530 | |
db276fa1 UD |
531 | HP_TIMING_DIFF (load_time, start, stop); |
532 | } | |
2de99474 | 533 | |
be935610 UD |
534 | phdr = _dl_loaded->l_phdr; |
535 | phent = _dl_loaded->l_phnum; | |
143e2b96 UD |
536 | /* We overwrite here a pointer to a malloc()ed string. But since |
537 | the malloc() implementation used at this point is the dummy | |
538 | implementations which has no real free() function it does not | |
539 | makes sense to free the old string first. */ | |
be935610 UD |
540 | _dl_loaded->l_name = (char *) ""; |
541 | *user_entry = _dl_loaded->l_entry; | |
0200214b RM |
542 | } |
543 | else | |
544 | { | |
545 | /* Create a link_map for the executable itself. | |
546 | This will be what dlopen on "" returns. */ | |
87c812c2 | 547 | _dl_new_object ((char *) "", "", lt_executable, NULL); |
be935610 | 548 | if (_dl_loaded == NULL) |
762a2918 | 549 | _dl_sysdep_fatal ("cannot allocate memory for link map\n", NULL); |
be935610 UD |
550 | _dl_loaded->l_phdr = phdr; |
551 | _dl_loaded->l_phnum = phent; | |
552 | _dl_loaded->l_entry = *user_entry; | |
553 | _dl_loaded->l_opencount = 1; | |
da832465 | 554 | |
61e0617a UD |
555 | /* At this point we are in a bit of trouble. We would have to |
556 | fill in the values for l_dev and l_ino. But in general we | |
557 | do not know where the file is. We also do not handle AT_EXECFD | |
558 | even if it would be passed up. | |
559 | ||
560 | We leave the values here defined to 0. This is normally no | |
561 | problem as the program code itself is normally no shared | |
562 | object and therefore cannot be loaded dynamically. Nothing | |
563 | prevent the use of dynamic binaries and in these situations | |
564 | we might get problems. We might not be able to find out | |
565 | whether the object is already loaded. But since there is no | |
566 | easy way out and because the dynamic binary must also not | |
567 | have an SONAME we ignore this program for now. If it becomes | |
568 | a problem we can force people using SONAMEs. */ | |
569 | ||
97a51d8a UD |
570 | /* We delay initializing the path structure until we got the dynamic |
571 | information for the program. */ | |
0200214b RM |
572 | } |
573 | ||
052b6a6c | 574 | /* It is not safe to load stuff after the main program. */ |
be935610 | 575 | _dl_loaded->l_map_end = ~0; |
052b6a6c | 576 | /* Perhaps the executable has no PT_LOAD header entries at all. */ |
be935610 | 577 | _dl_loaded->l_map_start = ~0; |
052b6a6c | 578 | |
0200214b RM |
579 | /* Scan the program header table for the dynamic section. */ |
580 | for (ph = phdr; ph < &phdr[phent]; ++ph) | |
581 | switch (ph->p_type) | |
582 | { | |
da832465 UD |
583 | case PT_PHDR: |
584 | /* Find out the load address. */ | |
be935610 | 585 | _dl_loaded->l_addr = (ElfW(Addr)) phdr - ph->p_vaddr; |
da832465 | 586 | break; |
0200214b RM |
587 | case PT_DYNAMIC: |
588 | /* This tells us where to find the dynamic section, | |
589 | which tells us everything we need to do. */ | |
be935610 | 590 | _dl_loaded->l_ld = (void *) _dl_loaded->l_addr + ph->p_vaddr; |
0200214b RM |
591 | break; |
592 | case PT_INTERP: | |
593 | /* This "interpreter segment" was used by the program loader to | |
594 | find the program interpreter, which is this program itself, the | |
595 | dynamic linker. We note what name finds us, so that a future | |
596 | dlopen call or DT_NEEDED entry, for something that wants to link | |
597 | against the dynamic linker as a shared library, will know that | |
598 | the shared object is already loaded. */ | |
be935610 UD |
599 | _dl_rtld_libname.name = ((const char *) _dl_loaded->l_addr |
600 | + ph->p_vaddr); | |
752a2a50 | 601 | /* _dl_rtld_libname.next = NULL; Already zero. */ |
c84142e8 | 602 | _dl_rtld_map.l_libname = &_dl_rtld_libname; |
f41c8091 UD |
603 | |
604 | /* Ordinarilly, we would get additional names for the loader from | |
605 | our DT_SONAME. This can't happen if we were actually linked as | |
606 | a static executable (detect this case when we have no DYNAMIC). | |
607 | If so, assume the filename component of the interpreter path to | |
608 | be our SONAME, and add it to our name list. */ | |
609 | if (_dl_rtld_map.l_ld == NULL) | |
610 | { | |
611 | char *p = strrchr (_dl_rtld_libname.name, '/'); | |
612 | if (p) | |
613 | { | |
614 | _dl_rtld_libname2.name = p+1; | |
752a2a50 | 615 | /* _dl_rtld_libname2.next = NULL; Already zero. */ |
f41c8091 UD |
616 | _dl_rtld_libname.next = &_dl_rtld_libname2; |
617 | } | |
618 | } | |
619 | ||
2f6d1f1b | 620 | has_interp = 1; |
0200214b | 621 | break; |
052b6a6c UD |
622 | case PT_LOAD: |
623 | /* Remember where the main program starts in memory. */ | |
624 | { | |
625 | ElfW(Addr) mapstart; | |
be935610 UD |
626 | mapstart = _dl_loaded->l_addr + (ph->p_vaddr & ~(ph->p_align - 1)); |
627 | if (_dl_loaded->l_map_start > mapstart) | |
628 | _dl_loaded->l_map_start = mapstart; | |
052b6a6c UD |
629 | } |
630 | break; | |
0200214b | 631 | } |
ffee1316 | 632 | if (! _dl_rtld_map.l_libname && _dl_rtld_map.l_name) |
c84142e8 UD |
633 | { |
634 | /* We were invoked directly, so the program might not have a | |
635 | PT_INTERP. */ | |
636 | _dl_rtld_libname.name = _dl_rtld_map.l_name; | |
752a2a50 | 637 | /* _dl_rtld_libname.next = NULL; Alread zero. */ |
c84142e8 UD |
638 | _dl_rtld_map.l_libname = &_dl_rtld_libname; |
639 | } | |
ffee1316 RM |
640 | else |
641 | assert (_dl_rtld_map.l_libname); /* How else did we get here? */ | |
0200214b | 642 | |
9a51759b UD |
643 | if (! rtld_is_main) |
644 | { | |
645 | /* Extract the contents of the dynamic section for easy access. */ | |
d3ac2d47 | 646 | elf_get_dynamic_info (_dl_loaded); |
9a51759b UD |
647 | if (_dl_loaded->l_info[DT_HASH]) |
648 | /* Set up our cache of pointers into the hash table. */ | |
649 | _dl_setup_hash (_dl_loaded); | |
650 | } | |
0200214b | 651 | |
9a821cf9 | 652 | if (__builtin_expect (mode, normal) == verify) |
e2102c14 UD |
653 | { |
654 | /* We were called just to verify that this is a dynamic | |
655 | executable using us as the program interpreter. Exit with an | |
656 | error if we were not able to load the binary or no interpreter | |
657 | is specified (i.e., this is no dynamically linked binary. */ | |
be935610 | 658 | if (_dl_loaded->l_ld == NULL) |
e2102c14 | 659 | _exit (1); |
e2102c14 UD |
660 | |
661 | /* We allow here some platform specific code. */ | |
662 | #ifdef DISTINGUISH_LIB_VERSIONS | |
663 | DISTINGUISH_LIB_VERSIONS; | |
664 | #endif | |
eb406346 | 665 | _exit (has_interp ? 0 : 2); |
e2102c14 UD |
666 | } |
667 | ||
9a51759b | 668 | if (! rtld_is_main) |
97a51d8a UD |
669 | /* Initialize the data structures for the search paths for shared |
670 | objects. */ | |
120b4c49 | 671 | _dl_init_paths (library_path); |
97a51d8a | 672 | |
0200214b | 673 | /* Put the link_map for ourselves on the chain so it can be found by |
ceb2d9aa | 674 | name. Note that at this point the global chain of link maps contains |
be935610 | 675 | exactly one element, which is pointed to by _dl_loaded. */ |
ffee1316 RM |
676 | if (! _dl_rtld_map.l_name) |
677 | /* If not invoked directly, the dynamic linker shared object file was | |
678 | found by the PT_INTERP name. */ | |
c84142e8 | 679 | _dl_rtld_map.l_name = (char *) _dl_rtld_map.l_libname->name; |
ba79d61b | 680 | _dl_rtld_map.l_type = lt_library; |
be935610 UD |
681 | _dl_loaded->l_next = &_dl_rtld_map; |
682 | _dl_rtld_map.l_prev = _dl_loaded; | |
1ebba33e | 683 | ++_dl_nloaded; |
0200214b | 684 | |
14bab8de | 685 | /* We have two ways to specify objects to preload: via environment |
49c091e5 | 686 | variable and via the file /etc/ld.so.preload. The latter can also |
14bab8de | 687 | be used when security is enabled. */ |
2064087b RM |
688 | preloads = NULL; |
689 | npreloads = 0; | |
14bab8de | 690 | |
db33f7d4 | 691 | if (__builtin_expect (preloadlist != NULL, 0)) |
c4029823 | 692 | { |
566efee2 UD |
693 | /* The LD_PRELOAD environment variable gives list of libraries |
694 | separated by white space or colons that are loaded before the | |
fd26970f UD |
695 | executable's dependencies and prepended to the global scope |
696 | list. If the binary is running setuid all elements | |
697 | containing a '/' are ignored since it is insecure. */ | |
698 | char *list = strdupa (preloadlist); | |
699 | char *p; | |
db276fa1 UD |
700 | |
701 | HP_TIMING_NOW (start); | |
702 | ||
566efee2 | 703 | while ((p = strsep (&list, " :")) != NULL) |
e2102c14 | 704 | if (p[0] != '\0' |
db33f7d4 UD |
705 | && (__builtin_expect (! __libc_enable_secure, 1) |
706 | || strchr (p, '/') == NULL)) | |
fd26970f | 707 | { |
be935610 | 708 | struct link_map *new_map = _dl_map_object (_dl_loaded, p, 1, |
bf8b3e74 | 709 | lt_library, 0, 0); |
bd355af0 UD |
710 | if (new_map->l_opencount == 1) |
711 | /* It is no duplicate. */ | |
712 | ++npreloads; | |
fd26970f | 713 | } |
db276fa1 UD |
714 | |
715 | HP_TIMING_NOW (stop); | |
716 | HP_TIMING_DIFF (diff, start, stop); | |
717 | HP_TIMING_ACCUM_NT (load_time, diff); | |
c4029823 UD |
718 | } |
719 | ||
14bab8de UD |
720 | /* Read the contents of the file. */ |
721 | file = _dl_sysdep_read_whole_file ("/etc/ld.so.preload", &file_size, | |
722 | PROT_READ | PROT_WRITE); | |
db33f7d4 | 723 | if (__builtin_expect (file != NULL, 0)) |
14bab8de UD |
724 | { |
725 | /* Parse the file. It contains names of libraries to be loaded, | |
726 | separated by white spaces or `:'. It may also contain | |
727 | comments introduced by `#'. */ | |
728 | char *problem; | |
729 | char *runp; | |
730 | size_t rest; | |
731 | ||
732 | /* Eliminate comments. */ | |
733 | runp = file; | |
734 | rest = file_size; | |
735 | while (rest > 0) | |
736 | { | |
737 | char *comment = memchr (runp, '#', rest); | |
738 | if (comment == NULL) | |
739 | break; | |
740 | ||
741 | rest -= comment - runp; | |
742 | do | |
743 | *comment = ' '; | |
744 | while (--rest > 0 && *++comment != '\n'); | |
745 | } | |
746 | ||
747 | /* We have one problematic case: if we have a name at the end of | |
748 | the file without a trailing terminating characters, we cannot | |
749 | place the \0. Handle the case separately. */ | |
49891c10 UD |
750 | if (file[file_size - 1] != ' ' && file[file_size - 1] != '\t' |
751 | && file[file_size - 1] != '\n' && file[file_size - 1] != ':') | |
14bab8de UD |
752 | { |
753 | problem = &file[file_size]; | |
754 | while (problem > file && problem[-1] != ' ' && problem[-1] != '\t' | |
49891c10 | 755 | && problem[-1] != '\n' && problem[-1] != ':') |
14bab8de UD |
756 | --problem; |
757 | ||
758 | if (problem > file) | |
759 | problem[-1] = '\0'; | |
760 | } | |
761 | else | |
49891c10 UD |
762 | { |
763 | problem = NULL; | |
764 | file[file_size - 1] = '\0'; | |
765 | } | |
14bab8de | 766 | |
db276fa1 UD |
767 | HP_TIMING_NOW (start); |
768 | ||
14bab8de UD |
769 | if (file != problem) |
770 | { | |
771 | char *p; | |
e2102c14 | 772 | runp = file; |
14bab8de | 773 | while ((p = strsep (&runp, ": \t\n")) != NULL) |
e2102c14 UD |
774 | if (p[0] != '\0') |
775 | { | |
be935610 | 776 | struct link_map *new_map = _dl_map_object (_dl_loaded, p, 1, |
bf8b3e74 | 777 | lt_library, 0, 0); |
e2102c14 UD |
778 | if (new_map->l_opencount == 1) |
779 | /* It is no duplicate. */ | |
780 | ++npreloads; | |
781 | } | |
14bab8de UD |
782 | } |
783 | ||
784 | if (problem != NULL) | |
785 | { | |
786 | char *p = strndupa (problem, file_size - (problem - file)); | |
be935610 | 787 | struct link_map *new_map = _dl_map_object (_dl_loaded, p, 1, |
bf8b3e74 | 788 | lt_library, 0, 0); |
bd355af0 UD |
789 | if (new_map->l_opencount == 1) |
790 | /* It is no duplicate. */ | |
791 | ++npreloads; | |
14bab8de UD |
792 | } |
793 | ||
db276fa1 UD |
794 | HP_TIMING_NOW (stop); |
795 | HP_TIMING_DIFF (diff, start, stop); | |
796 | HP_TIMING_ACCUM_NT (load_time, diff); | |
797 | ||
14bab8de UD |
798 | /* We don't need the file anymore. */ |
799 | __munmap (file, file_size); | |
800 | } | |
801 | ||
db33f7d4 | 802 | if (__builtin_expect (npreloads, 0) != 0) |
14bab8de UD |
803 | { |
804 | /* Set up PRELOADS with a vector of the preloaded libraries. */ | |
805 | struct link_map *l; | |
14bab8de UD |
806 | preloads = __alloca (npreloads * sizeof preloads[0]); |
807 | l = _dl_rtld_map.l_next; /* End of the chain before preloads. */ | |
808 | i = 0; | |
809 | do | |
810 | { | |
811 | preloads[i++] = l; | |
812 | l = l->l_next; | |
813 | } while (l); | |
814 | assert (i == npreloads); | |
815 | } | |
816 | ||
2064087b RM |
817 | /* Load all the libraries specified by DT_NEEDED entries. If LD_PRELOAD |
818 | specified some libraries to load, these are inserted before the actual | |
819 | dependencies in the executable's searchlist for symbol resolution. */ | |
db276fa1 | 820 | HP_TIMING_NOW (start); |
d9cb1a7d | 821 | _dl_map_object_deps (_dl_loaded, preloads, npreloads, mode == trace); |
db276fa1 UD |
822 | HP_TIMING_NOW (stop); |
823 | HP_TIMING_DIFF (diff, start, stop); | |
824 | HP_TIMING_ACCUM_NT (load_time, diff); | |
e3e35cfc UD |
825 | |
826 | /* Mark all objects as being in the global scope. */ | |
827 | for (i = _dl_loaded->l_searchlist.r_nlist; i > 0; ) | |
828 | _dl_loaded->l_searchlist.r_list[--i]->l_global = 1; | |
d66e34cd | 829 | |
2064087b | 830 | #ifndef MAP_ANON |
f332db02 RM |
831 | /* We are done mapping things, so close the zero-fill descriptor. */ |
832 | __close (_dl_zerofd); | |
833 | _dl_zerofd = -1; | |
2064087b | 834 | #endif |
f332db02 | 835 | |
f9496a7b RM |
836 | /* Remove _dl_rtld_map from the chain. */ |
837 | _dl_rtld_map.l_prev->l_next = _dl_rtld_map.l_next; | |
838 | if (_dl_rtld_map.l_next) | |
839 | _dl_rtld_map.l_next->l_prev = _dl_rtld_map.l_prev; | |
840 | ||
9a821cf9 | 841 | if (__builtin_expect (_dl_rtld_map.l_opencount, 2) > 1) |
0200214b | 842 | { |
f9496a7b RM |
843 | /* Some DT_NEEDED entry referred to the interpreter object itself, so |
844 | put it back in the list of visible objects. We insert it into the | |
845 | chain in symbol search order because gdb uses the chain's order as | |
846 | its symbol search order. */ | |
77aba05b | 847 | i = 1; |
be935610 | 848 | while (_dl_loaded->l_searchlist.r_list[i] != &_dl_rtld_map) |
f9496a7b | 849 | ++i; |
be935610 | 850 | _dl_rtld_map.l_prev = _dl_loaded->l_searchlist.r_list[i - 1]; |
b2bcd61a UD |
851 | if (__builtin_expect (mode, normal) == normal) |
852 | _dl_rtld_map.l_next = (i + 1 < _dl_loaded->l_searchlist.r_nlist | |
853 | ? _dl_loaded->l_searchlist.r_list[i + 1] | |
854 | : NULL); | |
855 | else | |
856 | /* In trace mode there might be an invisible object (which we | |
857 | could not find) after the previous one in the search list. | |
858 | In this case it doesn't matter much where we put the | |
859 | interpreter object, so we just initialize the list pointer so | |
860 | that the assertion below holds. */ | |
861 | _dl_rtld_map.l_next = _dl_rtld_map.l_prev->l_next; | |
862 | ||
f9496a7b RM |
863 | assert (_dl_rtld_map.l_prev->l_next == _dl_rtld_map.l_next); |
864 | _dl_rtld_map.l_prev->l_next = &_dl_rtld_map; | |
4d02a5b1 | 865 | if (_dl_rtld_map.l_next) |
f9496a7b RM |
866 | { |
867 | assert (_dl_rtld_map.l_next->l_prev == _dl_rtld_map.l_prev); | |
868 | _dl_rtld_map.l_next->l_prev = &_dl_rtld_map; | |
869 | } | |
0200214b | 870 | } |
d66e34cd | 871 | |
c84142e8 UD |
872 | /* Now let us see whether all libraries are available in the |
873 | versions we need. */ | |
874 | { | |
993b3242 UD |
875 | struct version_check_args args; |
876 | args.doexit = mode == normal; | |
145b8413 | 877 | args.dotrace = mode == trace; |
993b3242 | 878 | _dl_receive_error (print_missing_version, version_check_doit, &args); |
c84142e8 UD |
879 | } |
880 | ||
9a821cf9 | 881 | if (__builtin_expect (mode, normal) != normal) |
0200214b RM |
882 | { |
883 | /* We were run just to list the shared libraries. It is | |
884 | important that we do this before real relocation, because the | |
885 | functions we call below for output may no longer work properly | |
886 | after relocation. */ | |
0200214b RM |
887 | if (! _dl_loaded->l_info[DT_NEEDED]) |
888 | _dl_sysdep_message ("\t", "statically linked\n", NULL); | |
889 | else | |
ceb2d9aa UD |
890 | { |
891 | struct link_map *l; | |
892 | ||
893 | for (l = _dl_loaded->l_next; l; l = l->l_next) | |
894 | if (l->l_opencount == 0) | |
895 | /* The library was not found. */ | |
896 | _dl_sysdep_message ("\t", l->l_libname->name, " => not found\n", | |
897 | NULL); | |
898 | else | |
899 | { | |
900 | char buf[20], *bp; | |
901 | buf[sizeof buf - 1] = '\0'; | |
af6f3906 | 902 | bp = _itoa_word (l->l_addr, &buf[sizeof buf - 1], 16, 0); |
ceb2d9aa UD |
903 | while ((size_t) (&buf[sizeof buf - 1] - bp) |
904 | < sizeof l->l_addr * 2) | |
905 | *--bp = '0'; | |
906 | _dl_sysdep_message ("\t", l->l_libname->name, " => ", | |
907 | l->l_name, " (0x", bp, ")\n", NULL); | |
908 | } | |
909 | } | |
1a3a58fd | 910 | |
9a821cf9 | 911 | if (__builtin_expect (mode, trace) != trace) |
cddcfecf RM |
912 | for (i = 1; i < _dl_argc; ++i) |
913 | { | |
914 | const ElfW(Sym) *ref = NULL; | |
c0282c06 UD |
915 | ElfW(Addr) loadbase; |
916 | lookup_t result; | |
cddcfecf | 917 | char buf[20], *bp; |
c0282c06 UD |
918 | |
919 | result = _dl_lookup_symbol (_dl_argv[i], _dl_loaded, | |
920 | &ref, _dl_loaded->l_scope, | |
2b7238dd | 921 | ELF_MACHINE_JMP_SLOT, 1); |
c0282c06 UD |
922 | |
923 | loadbase = LOOKUP_VALUE_ADDRESS (result); | |
924 | ||
cddcfecf | 925 | buf[sizeof buf - 1] = '\0'; |
af6f3906 | 926 | bp = _itoa_word (ref->st_value, &buf[sizeof buf - 1], 16, 0); |
14bab8de | 927 | while ((size_t) (&buf[sizeof buf - 1] - bp) < sizeof loadbase * 2) |
cddcfecf RM |
928 | *--bp = '0'; |
929 | _dl_sysdep_message (_dl_argv[i], " found at 0x", bp, NULL); | |
930 | buf[sizeof buf - 1] = '\0'; | |
af6f3906 | 931 | bp = _itoa_word (loadbase, &buf[sizeof buf - 1], 16, 0); |
14bab8de | 932 | while ((size_t) (&buf[sizeof buf - 1] - bp) < sizeof loadbase * 2) |
cddcfecf RM |
933 | *--bp = '0'; |
934 | _dl_sysdep_message (" in object at 0x", bp, "\n", NULL); | |
935 | } | |
ce37fa88 | 936 | else |
fd26970f | 937 | { |
12b5b6b7 | 938 | if (_dl_lazy >= 0) |
ce37fa88 UD |
939 | { |
940 | /* We have to do symbol dependency testing. */ | |
941 | struct relocate_args args; | |
942 | struct link_map *l; | |
993b3242 | 943 | |
12b5b6b7 | 944 | args.lazy = _dl_lazy; |
fd26970f | 945 | |
ce37fa88 UD |
946 | l = _dl_loaded; |
947 | while (l->l_next) | |
948 | l = l->l_next; | |
949 | do | |
950 | { | |
951 | if (l != &_dl_rtld_map && l->l_opencount > 0) | |
952 | { | |
953 | args.l = l; | |
954 | _dl_receive_error (print_unresolved, relocate_doit, | |
955 | &args); | |
ce37fa88 UD |
956 | } |
957 | l = l->l_prev; | |
958 | } while (l); | |
959 | } | |
960 | ||
b0982c4a | 961 | #define VERNEEDTAG (DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGIDX (DT_VERNEED)) |
120b4c49 | 962 | if (version_info) |
fd26970f | 963 | { |
ce37fa88 UD |
964 | /* Print more information. This means here, print information |
965 | about the versions needed. */ | |
966 | int first = 1; | |
967 | struct link_map *map = _dl_loaded; | |
968 | ||
969 | for (map = _dl_loaded; map != NULL; map = map->l_next) | |
fd26970f | 970 | { |
f41c8091 | 971 | const char *strtab; |
ce37fa88 | 972 | ElfW(Dyn) *dyn = map->l_info[VERNEEDTAG]; |
f41c8091 UD |
973 | ElfW(Verneed) *ent; |
974 | ||
975 | if (dyn == NULL) | |
976 | continue; | |
977 | ||
a42195db | 978 | strtab = (const void *) D_PTR (map, l_info[DT_STRTAB]); |
f41c8091 | 979 | ent = (ElfW(Verneed) *) (map->l_addr + dyn->d_un.d_ptr); |
ce37fa88 | 980 | |
f41c8091 | 981 | if (first) |
ce37fa88 | 982 | { |
f41c8091 UD |
983 | _dl_sysdep_message ("\n\tVersion information:\n", NULL); |
984 | first = 0; | |
985 | } | |
ce37fa88 | 986 | |
f41c8091 UD |
987 | _dl_sysdep_message ("\t", (map->l_name[0] |
988 | ? map->l_name : _dl_argv[0]), | |
989 | ":\n", NULL); | |
990 | ||
991 | while (1) | |
992 | { | |
993 | ElfW(Vernaux) *aux; | |
994 | struct link_map *needed; | |
ce37fa88 | 995 | |
f41c8091 UD |
996 | needed = find_needed (strtab + ent->vn_file); |
997 | aux = (ElfW(Vernaux) *) ((char *) ent + ent->vn_aux); | |
ce37fa88 UD |
998 | |
999 | while (1) | |
1000 | { | |
f41c8091 UD |
1001 | const char *fname = NULL; |
1002 | ||
1003 | _dl_sysdep_message ("\t\t", | |
1004 | strtab + ent->vn_file, | |
1005 | " (", strtab + aux->vna_name, | |
1006 | ") ", | |
1007 | (aux->vna_flags | |
1008 | & VER_FLG_WEAK | |
1009 | ? "[WEAK] " : ""), | |
1010 | "=> ", NULL); | |
1011 | ||
1012 | if (needed != NULL | |
1013 | && match_version (strtab+aux->vna_name, needed)) | |
1014 | fname = needed->l_name; | |
1015 | ||
1016 | _dl_sysdep_message (fname ?: "not found", "\n", | |
1017 | NULL); | |
ce37fa88 | 1018 | |
f41c8091 UD |
1019 | if (aux->vna_next == 0) |
1020 | /* No more symbols. */ | |
ce37fa88 UD |
1021 | break; |
1022 | ||
f41c8091 UD |
1023 | /* Next symbol. */ |
1024 | aux = (ElfW(Vernaux) *) ((char *) aux | |
1025 | + aux->vna_next); | |
ce37fa88 | 1026 | } |
f41c8091 UD |
1027 | |
1028 | if (ent->vn_next == 0) | |
1029 | /* No more dependencies. */ | |
1030 | break; | |
1031 | ||
1032 | /* Next dependency. */ | |
1033 | ent = (ElfW(Verneed) *) ((char *) ent + ent->vn_next); | |
ce37fa88 | 1034 | } |
fd26970f | 1035 | } |
ce37fa88 | 1036 | } |
fd26970f | 1037 | } |
d66e34cd | 1038 | |
0200214b RM |
1039 | _exit (0); |
1040 | } | |
86d2c878 | 1041 | |
ba79d61b RM |
1042 | { |
1043 | /* Now we have all the objects loaded. Relocate them all except for | |
1044 | the dynamic linker itself. We do this in reverse order so that copy | |
1045 | relocs of earlier objects overwrite the data written by later | |
1046 | objects. We do not re-relocate the dynamic linker itself in this | |
1047 | loop because that could result in the GOT entries for functions we | |
1048 | call being changed, and that would break us. It is safe to relocate | |
1049 | the dynamic linker out of order because it has no copy relocs (we | |
1050 | know that because it is self-contained). */ | |
1051 | ||
ceb2d9aa | 1052 | struct link_map *l; |
c0fb8a56 | 1053 | int consider_profiling = _dl_profile != NULL; |
8b07d6a8 | 1054 | #ifndef HP_TIMING_NONAVAIL |
db276fa1 UD |
1055 | hp_timing_t start; |
1056 | hp_timing_t stop; | |
1057 | hp_timing_t add; | |
8b07d6a8 | 1058 | #endif |
c0fb8a56 UD |
1059 | |
1060 | /* If we are profiling we also must do lazy reloaction. */ | |
12b5b6b7 | 1061 | _dl_lazy |= consider_profiling; |
c0fb8a56 | 1062 | |
ba79d61b RM |
1063 | l = _dl_loaded; |
1064 | while (l->l_next) | |
1065 | l = l->l_next; | |
db276fa1 UD |
1066 | |
1067 | HP_TIMING_NOW (start); | |
ba79d61b RM |
1068 | do |
1069 | { | |
752a2a50 UD |
1070 | /* While we are at it, help the memory handling a bit. We have to |
1071 | mark some data structures as allocated with the fake malloc() | |
1072 | implementation in ld.so. */ | |
1073 | struct libname_list *lnp = l->l_libname->next; | |
1074 | ||
1075 | while (__builtin_expect (lnp != NULL, 0)) | |
1076 | { | |
1077 | lnp->dont_free = 1; | |
1078 | lnp = lnp->next; | |
1079 | } | |
1080 | ||
ba79d61b | 1081 | if (l != &_dl_rtld_map) |
12b5b6b7 | 1082 | _dl_relocate_object (l, l->l_scope, _dl_lazy, consider_profiling); |
be935610 | 1083 | |
ba79d61b | 1084 | l = l->l_prev; |
db276fa1 UD |
1085 | } |
1086 | while (l); | |
1087 | HP_TIMING_NOW (stop); | |
1088 | ||
1089 | HP_TIMING_DIFF (relocate_time, start, stop); | |
ba79d61b RM |
1090 | |
1091 | /* Do any necessary cleanups for the startup OS interface code. | |
1092 | We do these now so that no calls are made after rtld re-relocation | |
1093 | which might be resolved to different functions than we expect. | |
1094 | We cannot do this before relocating the other objects because | |
1095 | _dl_relocate_object might need to call `mprotect' for DT_TEXTREL. */ | |
1096 | _dl_sysdep_start_cleanup (); | |
1097 | ||
722c33bb UD |
1098 | /* Now enable profiling if needed. Like the previous call, |
1099 | this has to go here because the calls it makes should use the | |
1100 | rtld versions of the functions (particularly calloc()), but it | |
1101 | needs to have _dl_profile_map set up by the relocator. */ | |
db33f7d4 | 1102 | if (__builtin_expect (_dl_profile_map != NULL, 0)) |
722c33bb UD |
1103 | /* We must prepare the profiling. */ |
1104 | _dl_start_profile (_dl_profile_map, _dl_profile_output); | |
1105 | ||
1ca7cbcb | 1106 | if (_dl_rtld_map.l_opencount > 1) |
db276fa1 UD |
1107 | { |
1108 | /* There was an explicit ref to the dynamic linker as a shared lib. | |
1109 | Re-relocate ourselves with user-controlled symbol definitions. */ | |
1110 | HP_TIMING_NOW (start); | |
1111 | _dl_relocate_object (&_dl_rtld_map, _dl_loaded->l_scope, 0, 0); | |
1112 | HP_TIMING_NOW (stop); | |
1113 | HP_TIMING_DIFF (add, start, stop); | |
1114 | HP_TIMING_ACCUM_NT (relocate_time, add); | |
1115 | } | |
ba79d61b | 1116 | } |
ac16e905 | 1117 | |
be935610 UD |
1118 | /* Now set up the variable which helps the assembler startup code. */ |
1119 | _dl_main_searchlist = &_dl_loaded->l_searchlist; | |
1120 | _dl_global_scope[0] = &_dl_loaded->l_searchlist; | |
1121 | ||
604510f7 UD |
1122 | /* Safe the information about the original global scope list since |
1123 | we need it in the memory handling later. */ | |
1124 | _dl_initial_searchlist = *_dl_main_searchlist; | |
1125 | ||
4d6acc61 RM |
1126 | { |
1127 | /* Initialize _r_debug. */ | |
1128 | struct r_debug *r = _dl_debug_initialize (_dl_rtld_map.l_addr); | |
ceb2d9aa | 1129 | struct link_map *l; |
4d6acc61 RM |
1130 | |
1131 | l = _dl_loaded; | |
ec42724d RM |
1132 | |
1133 | #ifdef ELF_MACHINE_DEBUG_SETUP | |
1134 | ||
1135 | /* Some machines (e.g. MIPS) don't use DT_DEBUG in this way. */ | |
1136 | ||
1137 | ELF_MACHINE_DEBUG_SETUP (l, r); | |
1138 | ELF_MACHINE_DEBUG_SETUP (&_dl_rtld_map, r); | |
1139 | ||
1140 | #else | |
1141 | ||
4d6acc61 RM |
1142 | if (l->l_info[DT_DEBUG]) |
1143 | /* There is a DT_DEBUG entry in the dynamic section. Fill it in | |
1144 | with the run-time address of the r_debug structure */ | |
1145 | l->l_info[DT_DEBUG]->d_un.d_ptr = (ElfW(Addr)) r; | |
1146 | ||
d746b89c RM |
1147 | /* Fill in the pointer in the dynamic linker's own dynamic section, in |
1148 | case you run gdb on the dynamic linker directly. */ | |
1149 | if (_dl_rtld_map.l_info[DT_DEBUG]) | |
1150 | _dl_rtld_map.l_info[DT_DEBUG]->d_un.d_ptr = (ElfW(Addr)) r; | |
1151 | ||
ec42724d RM |
1152 | #endif |
1153 | ||
4d6acc61 RM |
1154 | /* Notify the debugger that all objects are now mapped in. */ |
1155 | r->r_state = RT_ADD; | |
1156 | _dl_debug_state (); | |
1157 | } | |
0200214b | 1158 | |
08cac4ac UD |
1159 | #ifndef MAP_COPY |
1160 | /* We must munmap() the cache file. */ | |
1161 | _dl_unload_cache (); | |
1162 | #endif | |
1163 | ||
d66e34cd RM |
1164 | /* Once we return, _dl_sysdep_start will invoke |
1165 | the DT_INIT functions and then *USER_ENTRY. */ | |
1166 | } | |
fd26970f UD |
1167 | \f |
1168 | /* This is a little helper function for resolving symbols while | |
1169 | tracing the binary. */ | |
1170 | static void | |
c84142e8 UD |
1171 | print_unresolved (int errcode __attribute__ ((unused)), const char *objname, |
1172 | const char *errstring) | |
fd26970f | 1173 | { |
3996f34b UD |
1174 | if (objname[0] == '\0') |
1175 | objname = _dl_argv[0] ?: "<main program>"; | |
fd26970f UD |
1176 | _dl_sysdep_error (errstring, " (", objname, ")\n", NULL); |
1177 | } | |
c84142e8 UD |
1178 | \f |
1179 | /* This is a little helper function for resolving symbols while | |
1180 | tracing the binary. */ | |
1181 | static void | |
1182 | print_missing_version (int errcode __attribute__ ((unused)), | |
1183 | const char *objname, const char *errstring) | |
1184 | { | |
1185 | _dl_sysdep_error (_dl_argv[0] ?: "<program name unknown>", ": ", | |
1186 | objname, ": ", errstring, "\n", NULL); | |
1187 | } | |
ea278354 | 1188 | \f |
7dea968e UD |
1189 | /* Nonzero if any of the debugging options is enabled. */ |
1190 | static int any_debug; | |
1191 | ||
b5efde2f UD |
1192 | /* Process the string given as the parameter which explains which debugging |
1193 | options are enabled. */ | |
1194 | static void | |
14c44e2e | 1195 | process_dl_debug (const char *dl_debug) |
b5efde2f | 1196 | { |
14c44e2e UD |
1197 | size_t len; |
1198 | #define separators " ,:" | |
b5efde2f UD |
1199 | do |
1200 | { | |
14c44e2e | 1201 | len = 0; |
b5efde2f | 1202 | /* Skip separating white spaces and commas. */ |
14c44e2e | 1203 | dl_debug += strspn (dl_debug, separators); |
b5efde2f UD |
1204 | if (*dl_debug != '\0') |
1205 | { | |
14c44e2e UD |
1206 | len = strcspn (dl_debug, separators); |
1207 | ||
1208 | switch (len) | |
b5efde2f | 1209 | { |
b0b67c47 UD |
1210 | case 3: |
1211 | /* This option is not documented since it is not generally | |
1212 | useful. */ | |
1213 | if (memcmp (dl_debug, "all", 3) == 0) | |
1214 | { | |
1215 | _dl_debug_libs = 1; | |
1216 | _dl_debug_impcalls = 1; | |
1217 | _dl_debug_reloc = 1; | |
1218 | _dl_debug_files = 1; | |
1219 | _dl_debug_symbols = 1; | |
1220 | _dl_debug_bindings = 1; | |
1221 | _dl_debug_versions = 1; | |
1222 | any_debug = 1; | |
ceb27555 | 1223 | continue; |
b0b67c47 UD |
1224 | } |
1225 | break; | |
1226 | ||
14c44e2e UD |
1227 | case 4: |
1228 | if (memcmp (dl_debug, "help", 4) == 0) | |
1229 | { | |
1230 | _dl_sysdep_message ("\ | |
08b511e6 | 1231 | Valid options for the LD_DEBUG environment variable are:\n\ |
b5efde2f | 1232 | \n\ |
5732c4df UD |
1233 | bindings display information about symbol binding\n\ |
1234 | files display processing of files and libraries\n\ | |
1235 | help display this help message and exit\n\ | |
1236 | libs display library search paths\n\ | |
dc911631 UD |
1237 | reloc display relocation processing\n\ |
1238 | statistics display relocation statistics\n\ | |
1239 | symbols display symbol table processing\n\ | |
5732c4df | 1240 | versions display version dependencies\n\ |
0c367d92 UD |
1241 | \n\ |
1242 | To direct the debugging output into a file instead of standard output\n\ | |
1243 | a filename can be specified using the LD_DEBUG_OUTPUT environment variable.\n", | |
1244 | NULL); | |
14c44e2e UD |
1245 | _exit (0); |
1246 | } | |
77aba05b | 1247 | |
14c44e2e UD |
1248 | if (memcmp (dl_debug, "libs", 4) == 0) |
1249 | { | |
1250 | _dl_debug_libs = 1; | |
1251 | _dl_debug_impcalls = 1; | |
1252 | any_debug = 1; | |
1253 | continue; | |
1254 | } | |
1255 | break; | |
1256 | ||
1257 | case 5: | |
1258 | if (memcmp (dl_debug, "reloc", 5) == 0) | |
1259 | { | |
1260 | _dl_debug_reloc = 1; | |
1261 | _dl_debug_impcalls = 1; | |
1262 | any_debug = 1; | |
1263 | continue; | |
1264 | } | |
1265 | ||
1266 | if (memcmp (dl_debug, "files", 5) == 0) | |
1267 | { | |
1268 | _dl_debug_files = 1; | |
1269 | _dl_debug_impcalls = 1; | |
1270 | any_debug = 1; | |
1271 | continue; | |
1272 | } | |
1273 | break; | |
77aba05b | 1274 | |
14c44e2e UD |
1275 | case 7: |
1276 | if (memcmp (dl_debug, "symbols", 7) == 0) | |
1277 | { | |
1278 | _dl_debug_symbols = 1; | |
1279 | _dl_debug_impcalls = 1; | |
1280 | any_debug = 1; | |
1281 | continue; | |
1282 | } | |
1283 | break; | |
77aba05b | 1284 | |
14c44e2e UD |
1285 | case 8: |
1286 | if (memcmp (dl_debug, "bindings", 8) == 0) | |
1287 | { | |
1288 | _dl_debug_bindings = 1; | |
1289 | _dl_debug_impcalls = 1; | |
1290 | any_debug = 1; | |
1291 | continue; | |
1292 | } | |
1293 | ||
1294 | if (memcmp (dl_debug, "versions", 8) == 0) | |
1295 | { | |
1296 | _dl_debug_versions = 1; | |
1297 | _dl_debug_impcalls = 1; | |
1298 | any_debug = 1; | |
1299 | continue; | |
1300 | } | |
1301 | break; | |
1302 | ||
db276fa1 UD |
1303 | case 10: |
1304 | if (memcmp (dl_debug, "statistics", 10) == 0) | |
1305 | { | |
1306 | _dl_debug_statistics = 1; | |
1307 | continue; | |
1308 | } | |
1309 | break; | |
1310 | ||
14c44e2e UD |
1311 | default: |
1312 | break; | |
77aba05b | 1313 | } |
14c44e2e UD |
1314 | |
1315 | { | |
1316 | /* Display a warning and skip everything until next separator. */ | |
1317 | char *startp = strndupa (dl_debug, len); | |
1318 | _dl_sysdep_error ("warning: debug option `", startp, | |
1319 | "' unknown; try LD_DEBUG=help\n", NULL); | |
db276fa1 | 1320 | break; |
14c44e2e | 1321 | } |
b5efde2f UD |
1322 | } |
1323 | } | |
14c44e2e | 1324 | while (*(dl_debug += len) != '\0'); |
b5efde2f UD |
1325 | } |
1326 | \f | |
ea278354 UD |
1327 | /* Process all environments variables the dynamic linker must recognize. |
1328 | Since all of them start with `LD_' we are a bit smarter while finding | |
1329 | all the entries. */ | |
1330 | static void | |
1331 | process_envvars (enum mode *modep, int *lazyp) | |
1332 | { | |
1333 | char **runp = NULL; | |
1334 | char *envline; | |
1335 | enum mode mode = normal; | |
1336 | int bind_now = 0; | |
7dea968e | 1337 | char *debug_output = NULL; |
ea278354 UD |
1338 | |
1339 | /* This is the default place for profiling data file. */ | |
1340 | _dl_profile_output = "/var/tmp"; | |
1341 | ||
1342 | while ((envline = _dl_next_ld_env_entry (&runp)) != NULL) | |
1343 | { | |
75e8d1f5 | 1344 | size_t len = strcspn (envline, "="); |
ea278354 | 1345 | |
75e8d1f5 UD |
1346 | if (envline[len] != '=') |
1347 | /* This is a "LD_" variable at the end of the string without | |
1348 | a '=' character. Ignore it since otherwise we will access | |
1349 | invalid memory below. */ | |
1350 | break; | |
1351 | ||
1352 | switch (len - 3) | |
ea278354 | 1353 | { |
14c44e2e UD |
1354 | case 4: |
1355 | /* Warning level, verbose or not. */ | |
1356 | if (memcmp (&envline[3], "WARN", 4) == 0) | |
1357 | _dl_verbose = envline[8] != '\0'; | |
1358 | break; | |
ea278354 | 1359 | |
14c44e2e UD |
1360 | case 5: |
1361 | /* Debugging of the dynamic linker? */ | |
1362 | if (memcmp (&envline[3], "DEBUG", 5) == 0) | |
1363 | process_dl_debug (&envline[9]); | |
1364 | break; | |
b5efde2f | 1365 | |
14c44e2e UD |
1366 | case 7: |
1367 | /* Print information about versions. */ | |
1368 | if (memcmp (&envline[3], "VERBOSE", 7) == 0) | |
1369 | { | |
1370 | version_info = envline[11] != '\0'; | |
1371 | break; | |
1372 | } | |
7dea968e | 1373 | |
14c44e2e UD |
1374 | /* List of objects to be preloaded. */ |
1375 | if (memcmp (&envline[3], "PRELOAD", 7) == 0) | |
1376 | { | |
1377 | preloadlist = &envline[11]; | |
1378 | break; | |
1379 | } | |
120b4c49 | 1380 | |
14c44e2e UD |
1381 | /* Which shared object shall be profiled. */ |
1382 | if (memcmp (&envline[3], "PROFILE", 7) == 0) | |
722c33bb | 1383 | _dl_profile = &envline[11]; |
14c44e2e | 1384 | break; |
120b4c49 | 1385 | |
14c44e2e UD |
1386 | case 8: |
1387 | /* Do we bind early? */ | |
0e103c6d | 1388 | if (memcmp (&envline[3], "BIND_NOW", 8) == 0) |
f53c03c2 UD |
1389 | { |
1390 | bind_now = envline[12] != '\0'; | |
1391 | break; | |
1392 | } | |
1393 | if (memcmp (&envline[3], "BIND_NOT", 8) == 0) | |
1394 | _dl_bind_not = envline[12] != '\0'; | |
14c44e2e | 1395 | break; |
ea278354 | 1396 | |
14c44e2e UD |
1397 | case 9: |
1398 | /* Test whether we want to see the content of the auxiliary | |
1399 | array passed up from the kernel. */ | |
1400 | if (memcmp (&envline[3], "SHOW_AUXV", 9) == 0) | |
1401 | _dl_show_auxv (); | |
1402 | break; | |
ea278354 | 1403 | |
12264bd7 | 1404 | case 10: |
3081378b | 1405 | /* Mask for the important hardware capabilities. */ |
12264bd7 UD |
1406 | if (memcmp (&envline[3], "HWCAP_MASK", 10) == 0) |
1407 | _dl_hwcap_mask = strtoul (&envline[14], NULL, 0); | |
1408 | break; | |
1409 | ||
f787edde UD |
1410 | case 11: |
1411 | /* Path where the binary is found. */ | |
45769315 UD |
1412 | if (!__libc_enable_secure |
1413 | && memcmp (&envline[3], "ORIGIN_PATH", 11) == 0) | |
997a4165 | 1414 | _dl_origin_path = &envline[15]; |
f787edde UD |
1415 | break; |
1416 | ||
14c44e2e | 1417 | case 12: |
dec126b4 UD |
1418 | /* The library search path. */ |
1419 | if (memcmp (&envline[3], "LIBRARY_PATH", 12) == 0) | |
1420 | { | |
1421 | library_path = &envline[16]; | |
1422 | break; | |
1423 | } | |
1424 | ||
14c44e2e UD |
1425 | /* Where to place the profiling data file. */ |
1426 | if (memcmp (&envline[3], "DEBUG_OUTPUT", 12) == 0) | |
1427 | { | |
1428 | debug_output = &envline[16]; | |
1429 | break; | |
1430 | } | |
ea278354 | 1431 | |
dec126b4 UD |
1432 | if (memcmp (&envline[3], "DYNAMIC_WEAK", 12) == 0) |
1433 | _dl_dynamic_weak = 1; | |
14c44e2e | 1434 | break; |
ea278354 | 1435 | |
14c44e2e UD |
1436 | case 14: |
1437 | /* Where to place the profiling data file. */ | |
3081378b UD |
1438 | if (!__libc_enable_secure |
1439 | && memcmp (&envline[3], "PROFILE_OUTPUT", 14) == 0) | |
14c44e2e UD |
1440 | { |
1441 | _dl_profile_output = &envline[18]; | |
1442 | if (*_dl_profile_output == '\0') | |
1443 | _dl_profile_output = "/var/tmp"; | |
1444 | } | |
1445 | break; | |
120b4c49 | 1446 | |
14c44e2e UD |
1447 | case 20: |
1448 | /* The mode of the dynamic linker can be set. */ | |
1449 | if (memcmp (&envline[3], "TRACE_LOADED_OBJECTS", 20) == 0) | |
1450 | mode = trace; | |
1451 | break; | |
e2102c14 UD |
1452 | |
1453 | /* We might have some extra environment variable to handle. This | |
1454 | is tricky due to the pre-processing of the length of the name | |
1455 | in the switch statement here. The code here assumes that added | |
1456 | environment variables have a different length. */ | |
1457 | #ifdef EXTRA_LD_ENVVARS | |
1458 | EXTRA_LD_ENVVARS | |
1459 | #endif | |
ea278354 UD |
1460 | } |
1461 | } | |
1462 | ||
4bae5567 UD |
1463 | /* Extra security for SUID binaries. Remove all dangerous environment |
1464 | variables. */ | |
1465 | if (__libc_enable_secure) | |
1466 | { | |
1467 | static const char *unsecure_envvars[] = | |
1468 | { | |
74955460 | 1469 | UNSECURE_ENVVARS, |
4bae5567 UD |
1470 | #ifdef EXTRA_UNSECURE_ENVVARS |
1471 | EXTRA_UNSECURE_ENVVARS | |
1472 | #endif | |
1473 | }; | |
1474 | size_t cnt; | |
1475 | ||
1476 | if (preloadlist != NULL) | |
1477 | unsetenv ("LD_PRELOAD"); | |
1478 | if (library_path != NULL) | |
1479 | unsetenv ("LD_LIBRARY_PATH"); | |
722c33bb UD |
1480 | if (_dl_origin_path != NULL) |
1481 | unsetenv ("LD_ORIGIN_PATH"); | |
1482 | if (debug_output != NULL) | |
1483 | unsetenv ("LD_DEBUG_OUTPUT"); | |
1484 | if (_dl_profile != NULL) | |
1485 | unsetenv ("LD_PROFILE"); | |
4bae5567 UD |
1486 | |
1487 | for (cnt = 0; | |
1488 | cnt < sizeof (unsecure_envvars) / sizeof (unsecure_envvars[0]); | |
1489 | ++cnt) | |
1490 | unsetenv (unsecure_envvars[cnt]); | |
74955460 UD |
1491 | |
1492 | if (__access ("/etc/suid-debug", F_OK) != 0) | |
1493 | unsetenv ("MALLOC_CHECK_"); | |
4bae5567 UD |
1494 | } |
1495 | ||
722c33bb UD |
1496 | /* The name of the object to profile cannot be empty. */ |
1497 | if (_dl_profile != NULL && *_dl_profile == '\0') | |
1498 | _dl_profile = NULL; | |
1499 | ||
7dea968e UD |
1500 | /* If we have to run the dynamic linker in debugging mode and the |
1501 | LD_DEBUG_OUTPUT environment variable is given, we write the debug | |
1502 | messages to this file. */ | |
14c44e2e | 1503 | if (any_debug && debug_output != NULL && !__libc_enable_secure) |
7dea968e | 1504 | { |
5f2de337 UD |
1505 | #ifdef O_NOFOLLOW |
1506 | const int flags = O_WRONLY | O_APPEND | O_CREAT | O_NOFOLLOW; | |
1507 | #else | |
1508 | const int flags = O_WRONLY | O_APPEND | O_CREAT; | |
1509 | #endif | |
7a2fd787 UD |
1510 | size_t name_len = strlen (debug_output); |
1511 | char buf[name_len + 12]; | |
1512 | char *startp; | |
1513 | ||
1514 | buf[name_len + 11] = '\0'; | |
1515 | startp = _itoa_word (__getpid (), &buf[name_len + 11], 10, 0); | |
1516 | *--startp = '.'; | |
1517 | startp = memcpy (startp - name_len, debug_output, name_len); | |
1518 | ||
5f2de337 | 1519 | _dl_debug_fd = __open (startp, flags, 0666); |
7dea968e UD |
1520 | if (_dl_debug_fd == -1) |
1521 | /* We use standard output if opening the file failed. */ | |
1522 | _dl_debug_fd = STDOUT_FILENO; | |
1523 | } | |
1524 | ||
ea278354 UD |
1525 | /* LAZY is determined by the environment variable LD_WARN and |
1526 | LD_BIND_NOW if we trace the binary. */ | |
9a821cf9 | 1527 | if (__builtin_expect (mode, normal) == trace) |
ea278354 UD |
1528 | *lazyp = _dl_verbose ? !bind_now : -1; |
1529 | else | |
57de5037 | 1530 | *lazyp = !bind_now; |
ea278354 UD |
1531 | |
1532 | *modep = mode; | |
1533 | } | |
db276fa1 UD |
1534 | |
1535 | ||
1536 | /* Print the various times we collected. */ | |
1537 | static void | |
1538 | print_statistics (void) | |
1539 | { | |
1540 | char buf[200]; | |
8b07d6a8 | 1541 | #ifndef HP_TIMING_NONAVAIL |
db276fa1 UD |
1542 | char *cp; |
1543 | char *wp; | |
1544 | ||
1545 | /* Total time rtld used. */ | |
1546 | if (HP_TIMING_AVAIL) | |
1547 | { | |
1548 | HP_TIMING_PRINT (buf, sizeof (buf), rtld_total_time); | |
1549 | _dl_debug_message (1, "\nruntime linker statistics:\n" | |
1550 | " total startup time in dynamic loader: ", | |
1551 | buf, "\n", NULL); | |
1552 | } | |
1553 | ||
1554 | /* Print relocation statistics. */ | |
1555 | if (HP_TIMING_AVAIL) | |
1556 | { | |
1557 | HP_TIMING_PRINT (buf, sizeof (buf), relocate_time); | |
1558 | _dl_debug_message (1, " time needed for relocation: ", buf, | |
1559 | NULL); | |
1560 | cp = _itoa_word ((1000 * relocate_time) / rtld_total_time, | |
1561 | buf + sizeof (buf), 10, 0); | |
1562 | wp = buf; | |
1563 | switch (buf + sizeof (buf) - cp) | |
1564 | { | |
1565 | case 3: | |
1566 | *wp++ = *cp++; | |
1567 | case 2: | |
1568 | *wp++ = *cp++; | |
1569 | case 1: | |
1570 | *wp++ = '.'; | |
1571 | *wp++ = *cp++; | |
1572 | } | |
1573 | *wp = '\0'; | |
1574 | _dl_debug_message (0, " (", buf, "%)\n", NULL); | |
1575 | } | |
1531e094 | 1576 | #endif |
db276fa1 UD |
1577 | buf[sizeof (buf) - 1] = '\0'; |
1578 | _dl_debug_message (1, " number of relocations: ", | |
1579 | _itoa_word (_dl_num_relocations, | |
1580 | buf + sizeof (buf) - 1, 10, 0), | |
1581 | "\n", NULL); | |
1582 | ||
1531e094 | 1583 | #ifndef HP_TIMING_NONAVAIL |
db276fa1 UD |
1584 | /* Time spend while loading the object and the dependencies. */ |
1585 | if (HP_TIMING_AVAIL) | |
1586 | { | |
1587 | HP_TIMING_PRINT (buf, sizeof (buf), load_time); | |
1588 | _dl_debug_message (1, " time needed to load objects: ", buf, | |
1589 | NULL); | |
1590 | cp = _itoa_word ((1000 * load_time) / rtld_total_time, | |
1591 | buf + sizeof (buf), 10, 0); | |
1592 | wp = buf; | |
1593 | switch (buf + sizeof (buf) - cp) | |
1594 | { | |
1595 | case 3: | |
1596 | *wp++ = *cp++; | |
1597 | case 2: | |
1598 | *wp++ = *cp++; | |
1599 | case 1: | |
1600 | *wp++ = '.'; | |
1601 | *wp++ = *cp++; | |
1602 | } | |
1603 | *wp = '\0'; | |
1604 | _dl_debug_message (0, " (", buf, "%)\n", NULL); | |
1605 | } | |
1531e094 | 1606 | #endif |
db276fa1 | 1607 | } |