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d66e34cd | 1 | /* Run time dynamic linker. |
e66d0a4c | 2 | Copyright (C) 1995-1999, 2000, 2001, 2002 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 | |
7d0b1164 | 20 | #include <errno.h> |
7dea968e | 21 | #include <fcntl.h> |
164a7164 | 22 | #include <stdbool.h> |
d66e34cd | 23 | #include <stdlib.h> |
f51d1dfd | 24 | #include <string.h> |
d66e34cd | 25 | #include <unistd.h> |
2064087b | 26 | #include <sys/mman.h> /* Check if MAP_ANON is defined. */ |
af8bf6bd | 27 | #include <sys/param.h> |
ba9fcb3f | 28 | #include <sys/stat.h> |
a42195db | 29 | #include <ldsodefs.h> |
ce37fa88 | 30 | #include <stdio-common/_itoa.h> |
f21acc89 | 31 | #include <entry.h> |
c94a8080 | 32 | #include <fpu_control.h> |
db276fa1 | 33 | #include <hp-timing.h> |
cf197e41 | 34 | #include <bits/libc-lock.h> |
f5348425 | 35 | #include "dynamic-link.h" |
e2102c14 | 36 | #include "dl-librecon.h" |
74955460 | 37 | #include <unsecvars.h> |
5688da55 UD |
38 | #include <dl-cache.h> |
39 | #include <dl-procinfo.h> | |
f5348425 | 40 | |
a853022c | 41 | #include <assert.h> |
f5348425 | 42 | |
6ce3881d RM |
43 | /* Avoid PLT use for our local calls at startup. */ |
44 | extern __typeof (__mempcpy) __mempcpy attribute_hidden; | |
45 | ||
46 | /* GCC has mental blocks about _exit. */ | |
47 | extern __typeof (_exit) exit_internal asm ("_exit") attribute_hidden; | |
48 | #define _exit exit_internal | |
49 | ||
fd26970f | 50 | /* Helper function to handle errors while resolving symbols. */ |
c84142e8 UD |
51 | static void print_unresolved (int errcode, const char *objname, |
52 | const char *errsting); | |
53 | ||
54 | /* Helper function to handle errors when a version is missing. */ | |
55 | static void print_missing_version (int errcode, const char *objname, | |
56 | const char *errsting); | |
fd26970f | 57 | |
db276fa1 UD |
58 | /* Print the various times we collected. */ |
59 | static void print_statistics (void); | |
ea278354 UD |
60 | |
61 | /* This is a list of all the modes the dynamic loader can be in. */ | |
62 | enum mode { normal, list, verify, trace }; | |
63 | ||
64 | /* Process all environments variables the dynamic linker must recognize. | |
65 | Since all of them start with `LD_' we are a bit smarter while finding | |
66 | all the entries. */ | |
ba9fcb3f | 67 | static void process_envvars (enum mode *modep); |
ea278354 | 68 | |
5c82e15e | 69 | int _dl_argc attribute_hidden; |
e6caf4e1 UD |
70 | char **_dl_argv = NULL; |
71 | INTDEF(_dl_argv) | |
5c82e15e UD |
72 | |
73 | /* Nonzero if we were run directly. */ | |
74 | unsigned int _dl_skip_args attribute_hidden; | |
cf197e41 | 75 | |
39778c6c UD |
76 | /* Set nonzero during loading and initialization of executable and |
77 | libraries, cleared before the executable's entry point runs. This | |
78 | must not be initialized to nonzero, because the unused dynamic | |
79 | linker loaded in for libc.so's "ld.so.1" dep will provide the | |
80 | definition seen by libc.so's initializer; that value must be zero, | |
81 | and will be since that dynamic linker's _dl_start and dl_main will | |
82 | never be called. */ | |
e6caf4e1 UD |
83 | int _dl_starting_up = 0; |
84 | INTVARDEF(_dl_starting_up) | |
39778c6c | 85 | |
d6b5d570 UD |
86 | /* This is the structure which defines all variables global to ld.so |
87 | (except those which cannot be added for some reason). */ | |
5688da55 UD |
88 | struct rtld_global _rtld_global = |
89 | { | |
ccdf0cab UD |
90 | /* Get architecture specific initializer. */ |
91 | #include <dl-procinfo.c> | |
5688da55 UD |
92 | ._dl_debug_fd = STDERR_FILENO, |
93 | #if 1 | |
94 | /* XXX I know about at least one case where we depend on the old | |
95 | weak behavior (it has to do with librt). Until we get DSO | |
96 | groups implemented we have to make this the default. | |
97 | Bummer. --drepper */ | |
98 | ._dl_dynamic_weak = 1, | |
99 | #endif | |
100 | ._dl_lazy = 1, | |
101 | ._dl_fpu_control = _FPU_DEFAULT, | |
102 | ._dl_correct_cache_id = _DL_CACHE_DEFAULT_ID, | |
103 | ._dl_hwcap_mask = HWCAP_IMPORTANT, | |
ffa8d2a0 | 104 | #ifdef _LIBC_REENTRANT |
5688da55 | 105 | ._dl_load_lock = _LIBC_LOCK_RECURSIVE_INITIALIZER |
ffa8d2a0 | 106 | #endif |
5688da55 | 107 | }; |
0d01dace | 108 | strong_alias (_rtld_global, _rtld_local); |
c0fb8a56 | 109 | |
67ddea92 | 110 | static void dl_main (const ElfW(Phdr) *phdr, ElfW(Word) phnum, |
266180eb | 111 | ElfW(Addr) *user_entry); |
d66e34cd | 112 | |
d6b5d570 UD |
113 | static struct libname_list _dl_rtld_libname; |
114 | static struct libname_list _dl_rtld_libname2; | |
86d2c878 | 115 | |
eaad82e0 UD |
116 | /* We expect less than a second for relocation. */ |
117 | #ifdef HP_SMALL_TIMING_AVAIL | |
118 | # undef HP_TIMING_AVAIL | |
119 | # define HP_TIMING_AVAIL HP_SMALL_TIMING_AVAIL | |
120 | #endif | |
121 | ||
db276fa1 | 122 | /* Variable for statistics. */ |
5732c4df | 123 | #ifndef HP_TIMING_NONAVAIL |
db276fa1 UD |
124 | static hp_timing_t rtld_total_time; |
125 | static hp_timing_t relocate_time; | |
126 | static hp_timing_t load_time; | |
01d8e36d | 127 | static hp_timing_t start_time; |
5732c4df | 128 | #endif |
db276fa1 | 129 | |
2a76f7ef UD |
130 | /* Additional definitions needed by TLS initialization. */ |
131 | #ifdef TLS_INIT_HELPER | |
132 | TLS_INIT_HELPER | |
133 | #endif | |
134 | ||
01d8e36d UD |
135 | /* Before ld.so is relocated we must not access variables which need |
136 | relocations. This means variables which are exported. Variables | |
137 | declared as static are fine. If we can mark a variable hidden this | |
138 | is fine, too. The latter is impotant here. We can avoid setting | |
139 | up a temporary link map for ld.so if we can mark _rtld_global as | |
140 | hidden. */ | |
9df89390 UD |
141 | #if defined PI_STATIC_AND_HIDDEN && defined HAVE_HIDDEN \ |
142 | && defined HAVE_VISIBILITY_ATTRIBUTE | |
01d8e36d UD |
143 | # define DONT_USE_BOOTSTRAP_MAP 1 |
144 | #endif | |
145 | ||
146 | #ifdef DONT_USE_BOOTSTRAP_MAP | |
147 | static ElfW(Addr) _dl_start_final (void *arg); | |
148 | #else | |
149 | static ElfW(Addr) _dl_start_final (void *arg, | |
150 | struct link_map *bootstrap_map_p); | |
151 | #endif | |
6a1db4ff | 152 | |
b1dbbaa4 RM |
153 | #ifdef RTLD_START |
154 | RTLD_START | |
155 | #else | |
eaad82e0 | 156 | # error "sysdeps/MACHINE/dl-machine.h fails to define RTLD_START" |
b1dbbaa4 RM |
157 | #endif |
158 | ||
c2248c44 RM |
159 | #ifndef VALIDX |
160 | # define VALIDX(tag) (DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGNUM \ | |
161 | + DT_EXTRANUM + DT_VALTAGIDX (tag)) | |
162 | #endif | |
163 | #ifndef ADDRIDX | |
164 | # define ADDRIDX(tag) (DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGNUM \ | |
165 | + DT_EXTRANUM + DT_VALNUM + DT_ADDRTAGIDX (tag)) | |
166 | #endif | |
167 | ||
168 | /* This is the second half of _dl_start (below). It can be inlined safely | |
169 | under DONT_USE_BOOTSTRAP_MAP, where it is careful not to make any GOT | |
170 | references. When the tools don't permit us to avoid using a GOT entry | |
171 | for _dl_rtld_global (no attribute_hidden support), we must make sure | |
172 | this function is not inlined (see below). */ | |
173 | ||
174 | #ifdef DONT_USE_BOOTSTRAP_MAP | |
175 | static inline ElfW(Addr) __attribute__ ((always_inline)) | |
176 | _dl_start_final (void *arg) | |
177 | #else | |
178 | static ElfW(Addr) __attribute__ ((noinline)) | |
179 | _dl_start_final (void *arg, struct link_map *bootstrap_map_p) | |
180 | #endif | |
181 | { | |
182 | ElfW(Addr) start_addr; | |
183 | extern char _begin[] attribute_hidden; | |
184 | extern char _end[] attribute_hidden; | |
185 | ||
186 | if (HP_TIMING_AVAIL) | |
187 | { | |
188 | /* If it hasn't happen yet record the startup time. */ | |
189 | if (! HP_TIMING_INLINE) | |
190 | HP_TIMING_NOW (start_time); | |
191 | ||
192 | /* Initialize the timing functions. */ | |
193 | HP_TIMING_DIFF_INIT (); | |
194 | } | |
195 | ||
196 | /* Transfer data about ourselves to the permanent link_map structure. */ | |
197 | #ifndef DONT_USE_BOOTSTRAP_MAP | |
198 | GL(dl_rtld_map).l_addr = bootstrap_map_p->l_addr; | |
199 | GL(dl_rtld_map).l_ld = bootstrap_map_p->l_ld; | |
200 | memcpy (GL(dl_rtld_map).l_info, bootstrap_map_p->l_info, | |
201 | sizeof GL(dl_rtld_map).l_info); | |
202 | GL(dl_rtld_map).l_mach = bootstrap_map_p->l_mach; | |
203 | #endif | |
204 | _dl_setup_hash (&GL(dl_rtld_map)); | |
205 | GL(dl_rtld_map).l_opencount = 1; | |
206 | GL(dl_rtld_map).l_map_start = (ElfW(Addr)) _begin; | |
207 | GL(dl_rtld_map).l_map_end = (ElfW(Addr)) _end; | |
208 | /* Copy the TLS related data if necessary. */ | |
209 | #if USE_TLS && !defined DONT_USE_BOOTSTRAP_MAP | |
210 | # ifdef HAVE___THREAD | |
211 | assert (bootstrap_map_p->l_tls_modid != 0); | |
212 | # else | |
213 | if (bootstrap_map_p->l_tls_modid != 0) | |
214 | # endif | |
215 | { | |
216 | GL(dl_rtld_map).l_tls_blocksize = bootstrap_map_p->l_tls_blocksize; | |
217 | GL(dl_rtld_map).l_tls_align = bootstrap_map_p->l_tls_align; | |
218 | GL(dl_rtld_map).l_tls_initimage_size | |
219 | = bootstrap_map_p->l_tls_initimage_size; | |
220 | GL(dl_rtld_map).l_tls_initimage = bootstrap_map_p->l_tls_initimage; | |
221 | GL(dl_rtld_map).l_tls_offset = bootstrap_map_p->l_tls_offset; | |
222 | GL(dl_rtld_map).l_tls_modid = 1; | |
223 | GL(dl_rtld_map).l_tls_tp_initialized | |
224 | = bootstrap_map_p->l_tls_tp_initialized; | |
225 | } | |
226 | #endif | |
227 | ||
228 | #if HP_TIMING_AVAIL | |
229 | HP_TIMING_NOW (GL(dl_cpuclock_offset)); | |
230 | #endif | |
231 | ||
232 | /* Call the OS-dependent function to set up life so we can do things like | |
233 | file access. It will call `dl_main' (below) to do all the real work | |
234 | of the dynamic linker, and then unwind our frame and run the user | |
235 | entry point on the same stack we entered on. */ | |
236 | start_addr = _dl_sysdep_start (arg, &dl_main); | |
237 | ||
238 | #ifndef HP_TIMING_NONAVAIL | |
239 | if (HP_TIMING_AVAIL) | |
240 | { | |
241 | hp_timing_t end_time; | |
242 | ||
243 | /* Get the current time. */ | |
244 | HP_TIMING_NOW (end_time); | |
245 | ||
246 | /* Compute the difference. */ | |
247 | HP_TIMING_DIFF (rtld_total_time, start_time, end_time); | |
248 | } | |
249 | #endif | |
250 | ||
251 | if (__builtin_expect (GL(dl_debug_mask) & DL_DEBUG_STATISTICS, 0)) | |
252 | print_statistics (); | |
253 | ||
254 | return start_addr; | |
255 | } | |
256 | ||
50746436 | 257 | static ElfW(Addr) __attribute_used__ internal_function |
d66e34cd RM |
258 | _dl_start (void *arg) |
259 | { | |
01d8e36d UD |
260 | #ifdef DONT_USE_BOOTSTRAP_MAP |
261 | # define bootstrap_map GL(dl_rtld_map) | |
262 | #else | |
86d2c878 | 263 | struct link_map bootstrap_map; |
01d8e36d | 264 | #endif |
739d440d | 265 | #if !defined HAVE_BUILTIN_MEMSET || defined USE_TLS |
264ec183 | 266 | size_t cnt; |
1b4575ae | 267 | #endif |
739d440d UD |
268 | #ifdef USE_TLS |
269 | ElfW(Ehdr) *ehdr; | |
270 | ElfW(Phdr) *phdr; | |
271 | dtv_t initdtv[3]; | |
272 | #endif | |
d66e34cd | 273 | |
b1dbbaa4 RM |
274 | /* This #define produces dynamic linking inline functions for |
275 | bootstrap relocation instead of general-purpose relocation. */ | |
276 | #define RTLD_BOOTSTRAP | |
c0282c06 UD |
277 | #define RESOLVE_MAP(sym, version, flags) \ |
278 | ((*(sym))->st_shndx == SHN_UNDEF ? 0 : &bootstrap_map) | |
50463d27 UD |
279 | #define RESOLVE(sym, version, flags) \ |
280 | ((*(sym))->st_shndx == SHN_UNDEF ? 0 : bootstrap_map.l_addr) | |
b1dbbaa4 RM |
281 | #include "dynamic-link.h" |
282 | ||
db276fa1 UD |
283 | if (HP_TIMING_INLINE && HP_TIMING_AVAIL) |
284 | HP_TIMING_NOW (start_time); | |
285 | ||
e66d0a4c UD |
286 | /* Partly clean the `bootstrap_map' structure up. Don't use |
287 | `memset' since it might not be built in or inlined and we cannot | |
288 | make function calls at this point. Use '__builtin_memset' if we | |
01d8e36d UD |
289 | know it is available. We do not have to clear the memory if we |
290 | do not have to use the temporary bootstrap_map. Global variables | |
291 | are initialized to zero by default. */ | |
292 | #ifndef DONT_USE_BOOTSTRAP_MAP | |
293 | # ifdef HAVE_BUILTIN_MEMSET | |
e66d0a4c | 294 | __builtin_memset (bootstrap_map.l_info, '\0', sizeof (bootstrap_map.l_info)); |
01d8e36d | 295 | # else |
264ec183 UD |
296 | for (cnt = 0; |
297 | cnt < sizeof (bootstrap_map.l_info) / sizeof (bootstrap_map.l_info[0]); | |
298 | ++cnt) | |
299 | bootstrap_map.l_info[cnt] = 0; | |
01d8e36d | 300 | # endif |
e66d0a4c | 301 | #endif |
264ec183 | 302 | |
d66e34cd | 303 | /* Figure out the run-time load address of the dynamic linker itself. */ |
86d2c878 | 304 | bootstrap_map.l_addr = elf_machine_load_address (); |
d66e34cd | 305 | |
47707456 UD |
306 | /* Read our own dynamic section and fill in the info array. */ |
307 | bootstrap_map.l_ld = (void *) bootstrap_map.l_addr + elf_machine_dynamic (); | |
d3ac2d47 | 308 | elf_get_dynamic_info (&bootstrap_map); |
d66e34cd | 309 | |
739d440d | 310 | #if USE_TLS |
01d8e36d | 311 | # if !defined HAVE___THREAD && !defined DONT_USE_BOOTSTRAP_MAP |
739d440d UD |
312 | /* Signal that we have not found TLS data so far. */ |
313 | bootstrap_map.l_tls_modid = 0; | |
314 | # endif | |
315 | ||
316 | /* Get the dynamic linkers program header. */ | |
317 | ehdr = (ElfW(Ehdr) *) bootstrap_map.l_addr; | |
318 | phdr = (ElfW(Phdr) *) (bootstrap_map.l_addr + ehdr->e_phoff); | |
319 | for (cnt = 0; cnt < ehdr->e_phnum; ++cnt) | |
320 | if (phdr[cnt].p_type == PT_TLS) | |
321 | { | |
322 | void *tlsblock; | |
323 | size_t max_align = MAX (TLS_INIT_TCB_ALIGN, phdr[cnt].p_align); | |
f884de5b | 324 | char *p; |
739d440d UD |
325 | |
326 | bootstrap_map.l_tls_blocksize = phdr[cnt].p_memsz; | |
327 | bootstrap_map.l_tls_align = phdr[cnt].p_align; | |
328 | assert (bootstrap_map.l_tls_blocksize != 0); | |
329 | bootstrap_map.l_tls_initimage_size = phdr[cnt].p_filesz; | |
330 | bootstrap_map.l_tls_initimage = (void *) (bootstrap_map.l_addr | |
a816b435 | 331 | + phdr[cnt].p_vaddr); |
739d440d UD |
332 | |
333 | /* We can now allocate the initial TLS block. This can happen | |
334 | on the stack. We'll get the final memory later when we | |
335 | know all about the various objects loaded at startup | |
336 | time. */ | |
337 | # if TLS_TCB_AT_TP | |
338 | tlsblock = alloca (roundup (bootstrap_map.l_tls_blocksize, | |
339 | TLS_INIT_TCB_ALIGN) | |
340 | + TLS_INIT_TCB_SIZE | |
341 | + max_align); | |
342 | # elif TLS_DTV_AT_TP | |
343 | tlsblock = alloca (roundup (TLS_INIT_TCB_SIZE, | |
344 | bootstrap_map.l_tls_align) | |
345 | + bootstrap_map.l_tls_blocksize | |
346 | + max_align); | |
347 | # else | |
348 | /* In case a model with a different layout for the TCB and DTV | |
349 | is defined add another #elif here and in the following #ifs. */ | |
350 | # error "Either TLS_TCB_AT_TP or TLS_DTV_AT_TP must be defined" | |
351 | # endif | |
352 | /* Align the TLS block. */ | |
353 | tlsblock = (void *) (((uintptr_t) tlsblock + max_align - 1) | |
354 | & ~(max_align - 1)); | |
355 | ||
356 | /* Initialize the dtv. [0] is the length, [1] the generation | |
357 | counter. */ | |
358 | initdtv[0].counter = 1; | |
359 | initdtv[1].counter = 0; | |
360 | ||
361 | /* Initialize the TLS block. */ | |
362 | # if TLS_TCB_AT_TP | |
363 | initdtv[2].pointer = tlsblock; | |
364 | # elif TLS_DTV_AT_TP | |
365 | bootstrap_map.l_tls_offset = roundup (TLS_INIT_TCB_SIZE, | |
366 | bootstrap_map.l_tls_align); | |
367 | initdtv[2].pointer = (char *) tlsblock + bootstrap_map.l_tls_offset; | |
368 | # else | |
369 | # error "Either TLS_TCB_AT_TP or TLS_DTV_AT_TP must be defined" | |
370 | # endif | |
f884de5b UD |
371 | p = __mempcpy (initdtv[2].pointer, bootstrap_map.l_tls_initimage, |
372 | bootstrap_map.l_tls_initimage_size); | |
373 | # ifdef HAVE_BUILTIN_MEMSET | |
374 | __builtin_memset (p, '\0', (bootstrap_map.l_tls_blocksize | |
375 | - bootstrap_map.l_tls_initimage_size)); | |
376 | # else | |
377 | { | |
378 | size_t remaining = (bootstrap_map.l_tls_blocksize | |
379 | - bootstrap_map.l_tls_initimage_size); | |
380 | while (remaining-- > 0) | |
381 | *p++ = '\0'; | |
382 | } | |
383 | #endif | |
739d440d UD |
384 | |
385 | /* Install the pointer to the dtv. */ | |
386 | ||
387 | /* Initialize the thread pointer. */ | |
388 | # if TLS_TCB_AT_TP | |
389 | bootstrap_map.l_tls_offset | |
390 | = roundup (bootstrap_map.l_tls_blocksize, TLS_INIT_TCB_ALIGN); | |
391 | ||
392 | INSTALL_DTV ((char *) tlsblock + bootstrap_map.l_tls_offset, | |
393 | initdtv); | |
394 | ||
9d69bd24 | 395 | if (TLS_INIT_TP ((char *) tlsblock + bootstrap_map.l_tls_offset, 0) |
d78ce054 | 396 | != 0) |
2a76f7ef | 397 | _dl_fatal_printf ("cannot setup thread-local storage\n"); |
739d440d UD |
398 | # elif TLS_DTV_AT_TP |
399 | INSTALL_DTV (tlsblock, initdtv); | |
9d69bd24 | 400 | if (TLS_INIT_TP (tlsblock, 0) != 0) |
2a76f7ef | 401 | _dl_fatal_printf ("cannot setup thread-local storage\n"); |
739d440d UD |
402 | # else |
403 | # error "Either TLS_TCB_AT_TP or TLS_DTV_AT_TP must be defined" | |
404 | # endif | |
405 | ||
406 | /* So far this is module number one. */ | |
407 | bootstrap_map.l_tls_modid = 1; | |
9d69bd24 UD |
408 | /* The TP got initialized. */ |
409 | bootstrap_map.l_tls_tp_initialized = 1; | |
739d440d UD |
410 | |
411 | /* There can only be one PT_TLS entry. */ | |
412 | break; | |
413 | } | |
414 | #endif /* use TLS */ | |
415 | ||
d66e34cd | 416 | #ifdef ELF_MACHINE_BEFORE_RTLD_RELOC |
86d2c878 | 417 | ELF_MACHINE_BEFORE_RTLD_RELOC (bootstrap_map.l_info); |
d66e34cd RM |
418 | #endif |
419 | ||
32e6df36 UD |
420 | if (bootstrap_map.l_addr || ! bootstrap_map.l_info[VALIDX(DT_GNU_PRELINKED)]) |
421 | { | |
422 | /* Relocate ourselves so we can do normal function calls and | |
423 | data access using the global offset table. */ | |
424 | ||
425 | ELF_DYNAMIC_RELOCATE (&bootstrap_map, 0, 0); | |
426 | } | |
421f82e5 | 427 | |
ea7eb7e3 UD |
428 | /* Please note that we don't allow profiling of this object and |
429 | therefore need not test whether we have to allocate the array | |
430 | for the relocation results (as done in dl-reloc.c). */ | |
421f82e5 | 431 | |
d66e34cd RM |
432 | /* Now life is sane; we can call functions and access global data. |
433 | Set up to use the operating system facilities, and find out from | |
434 | the operating system's program loader where to find the program | |
6a1db4ff UD |
435 | header table in core. Put the rest of _dl_start into a separate |
436 | function, that way the compiler cannot put accesses to the GOT | |
437 | before ELF_DYNAMIC_RELOCATE. */ | |
c0282c06 | 438 | { |
01d8e36d UD |
439 | #ifdef DONT_USE_BOOTSTRAP_MAP |
440 | ElfW(Addr) entry = _dl_start_final (arg); | |
441 | #else | |
442 | ElfW(Addr) entry = _dl_start_final (arg, &bootstrap_map); | |
443 | #endif | |
c0282c06 UD |
444 | |
445 | #ifndef ELF_MACHINE_START_ADDRESS | |
446 | # define ELF_MACHINE_START_ADDRESS(map, start) (start) | |
447 | #endif | |
448 | ||
d6b5d570 | 449 | return ELF_MACHINE_START_ADDRESS (GL(dl_loaded), entry); |
c0282c06 | 450 | } |
6a1db4ff UD |
451 | } |
452 | ||
453 | ||
d66e34cd | 454 | |
d66e34cd RM |
455 | /* Now life is peachy; we can do all normal operations. |
456 | On to the real work. */ | |
457 | ||
993b3242 UD |
458 | /* Some helper functions. */ |
459 | ||
460 | /* Arguments to relocate_doit. */ | |
461 | struct relocate_args | |
462 | { | |
463 | struct link_map *l; | |
464 | int lazy; | |
465 | }; | |
466 | ||
467 | struct map_args | |
468 | { | |
469 | /* Argument to map_doit. */ | |
470 | char *str; | |
471 | /* Return value of map_doit. */ | |
472 | struct link_map *main_map; | |
473 | }; | |
474 | ||
475 | /* Arguments to version_check_doit. */ | |
476 | struct version_check_args | |
477 | { | |
993b3242 | 478 | int doexit; |
145b8413 | 479 | int dotrace; |
993b3242 UD |
480 | }; |
481 | ||
482 | static void | |
483 | relocate_doit (void *a) | |
484 | { | |
485 | struct relocate_args *args = (struct relocate_args *) a; | |
486 | ||
cff26a3e | 487 | INTUSE(_dl_relocate_object) (args->l, args->l->l_scope, args->lazy, 0); |
993b3242 UD |
488 | } |
489 | ||
490 | static void | |
491 | map_doit (void *a) | |
492 | { | |
be935610 | 493 | struct map_args *args = (struct map_args *) a; |
cff26a3e | 494 | args->main_map = INTUSE(_dl_map_object) (NULL, args->str, 0, lt_library, 0, 0); |
993b3242 UD |
495 | } |
496 | ||
497 | static void | |
498 | version_check_doit (void *a) | |
499 | { | |
be935610 | 500 | struct version_check_args *args = (struct version_check_args *) a; |
d6b5d570 | 501 | if (_dl_check_all_versions (GL(dl_loaded), 1, args->dotrace) && args->doexit) |
993b3242 UD |
502 | /* We cannot start the application. Abort now. */ |
503 | _exit (1); | |
504 | } | |
505 | ||
ce37fa88 UD |
506 | |
507 | static inline struct link_map * | |
508 | find_needed (const char *name) | |
509 | { | |
d6b5d570 | 510 | unsigned int n = GL(dl_loaded)->l_searchlist.r_nlist; |
ce37fa88 | 511 | |
be935610 | 512 | while (n-- > 0) |
d6b5d570 UD |
513 | if (_dl_name_match_p (name, GL(dl_loaded)->l_searchlist.r_list[n])) |
514 | return GL(dl_loaded)->l_searchlist.r_list[n]; | |
ce37fa88 UD |
515 | |
516 | /* Should never happen. */ | |
517 | return NULL; | |
518 | } | |
519 | ||
520 | static int | |
521 | match_version (const char *string, struct link_map *map) | |
522 | { | |
a42195db | 523 | const char *strtab = (const void *) D_PTR (map, l_info[DT_STRTAB]); |
ce37fa88 UD |
524 | ElfW(Verdef) *def; |
525 | ||
b0982c4a | 526 | #define VERDEFTAG (DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGIDX (DT_VERDEF)) |
ce37fa88 UD |
527 | if (map->l_info[VERDEFTAG] == NULL) |
528 | /* The file has no symbol versioning. */ | |
529 | return 0; | |
530 | ||
531 | def = (ElfW(Verdef) *) ((char *) map->l_addr | |
532 | + map->l_info[VERDEFTAG]->d_un.d_ptr); | |
533 | while (1) | |
534 | { | |
535 | ElfW(Verdaux) *aux = (ElfW(Verdaux) *) ((char *) def + def->vd_aux); | |
536 | ||
537 | /* Compare the version strings. */ | |
538 | if (strcmp (string, strtab + aux->vda_name) == 0) | |
539 | /* Bingo! */ | |
540 | return 1; | |
541 | ||
542 | /* If no more definitions we failed to find what we want. */ | |
543 | if (def->vd_next == 0) | |
544 | break; | |
545 | ||
546 | /* Next definition. */ | |
547 | def = (ElfW(Verdef) *) ((char *) def + def->vd_next); | |
548 | } | |
549 | ||
550 | return 0; | |
551 | } | |
552 | ||
120b4c49 UD |
553 | static const char *library_path; /* The library search path. */ |
554 | static const char *preloadlist; /* The list preloaded objects. */ | |
555 | static int version_info; /* Nonzero if information about | |
556 | versions has to be printed. */ | |
a1a9d215 | 557 | |
d66e34cd | 558 | static void |
266180eb | 559 | dl_main (const ElfW(Phdr) *phdr, |
72f70279 | 560 | ElfW(Word) phnum, |
266180eb | 561 | ElfW(Addr) *user_entry) |
d66e34cd | 562 | { |
266180eb | 563 | const ElfW(Phdr) *ph; |
ea278354 | 564 | enum mode mode; |
2064087b RM |
565 | struct link_map **preloads; |
566 | unsigned int npreloads; | |
14bab8de UD |
567 | size_t file_size; |
568 | char *file; | |
164a7164 | 569 | bool has_interp = false; |
77aba05b | 570 | unsigned int i; |
164a7164 UD |
571 | bool prelinked = false; |
572 | bool rtld_is_main = false; | |
5732c4df | 573 | #ifndef HP_TIMING_NONAVAIL |
db276fa1 UD |
574 | hp_timing_t start; |
575 | hp_timing_t stop; | |
576 | hp_timing_t diff; | |
5732c4df | 577 | #endif |
a52d1562 UD |
578 | #ifdef USE_TLS |
579 | void *tcbp; | |
580 | #endif | |
d66e34cd | 581 | |
ea278354 | 582 | /* Process the environment variable which control the behaviour. */ |
ba9fcb3f | 583 | process_envvars (&mode); |
3996f34b | 584 | |
46ec036d | 585 | /* Set up a flag which tells we are just starting. */ |
e6caf4e1 | 586 | INTUSE(_dl_starting_up) = 1; |
46ec036d | 587 | |
a16956f3 | 588 | if (*user_entry == (ElfW(Addr)) ENTRY_POINT) |
0200214b RM |
589 | { |
590 | /* Ho ho. We are not the program interpreter! We are the program | |
591 | itself! This means someone ran ld.so as a command. Well, that | |
592 | might be convenient to do sometimes. We support it by | |
593 | interpreting the args like this: | |
594 | ||
595 | ld.so PROGRAM ARGS... | |
596 | ||
597 | The first argument is the name of a file containing an ELF | |
598 | executable we will load and run with the following arguments. | |
599 | To simplify life here, PROGRAM is searched for using the | |
600 | normal rules for shared objects, rather than $PATH or anything | |
601 | like that. We just load it and use its entry point; we don't | |
602 | pay attention to its PT_INTERP command (we are the interpreter | |
603 | ourselves). This is an easy way to test a new ld.so before | |
604 | installing it. */ | |
164a7164 | 605 | rtld_is_main = true; |
421f82e5 | 606 | |
ffee1316 | 607 | /* Note the place where the dynamic linker actually came from. */ |
e6caf4e1 | 608 | GL(dl_rtld_map).l_name = rtld_progname; |
6a76c115 | 609 | |
fd26970f | 610 | while (_dl_argc > 1) |
e6caf4e1 | 611 | if (! strcmp (INTUSE(_dl_argv)[1], "--list")) |
fd26970f UD |
612 | { |
613 | mode = list; | |
5688da55 | 614 | GL(dl_lazy) = -1; /* This means do no dependency analysis. */ |
61965e9b | 615 | |
fd26970f UD |
616 | ++_dl_skip_args; |
617 | --_dl_argc; | |
e6caf4e1 | 618 | ++INTUSE(_dl_argv); |
fd26970f | 619 | } |
e6caf4e1 | 620 | else if (! strcmp (INTUSE(_dl_argv)[1], "--verify")) |
fd26970f UD |
621 | { |
622 | mode = verify; | |
6a76c115 | 623 | |
fd26970f UD |
624 | ++_dl_skip_args; |
625 | --_dl_argc; | |
e6caf4e1 | 626 | ++INTUSE(_dl_argv); |
fd26970f | 627 | } |
e6caf4e1 UD |
628 | else if (! strcmp (INTUSE(_dl_argv)[1], "--library-path") |
629 | && _dl_argc > 2) | |
880f421f | 630 | { |
e6caf4e1 | 631 | library_path = INTUSE(_dl_argv)[2]; |
880f421f | 632 | |
310930c1 UD |
633 | _dl_skip_args += 2; |
634 | _dl_argc -= 2; | |
e6caf4e1 | 635 | INTUSE(_dl_argv) += 2; |
310930c1 | 636 | } |
e6caf4e1 UD |
637 | else if (! strcmp (INTUSE(_dl_argv)[1], "--inhibit-rpath") |
638 | && _dl_argc > 2) | |
310930c1 | 639 | { |
e6caf4e1 | 640 | GL(dl_inhibit_rpath) = INTUSE(_dl_argv)[2]; |
310930c1 | 641 | |
880f421f UD |
642 | _dl_skip_args += 2; |
643 | _dl_argc -= 2; | |
e6caf4e1 | 644 | INTUSE(_dl_argv) += 2; |
880f421f | 645 | } |
fd26970f UD |
646 | else |
647 | break; | |
d66e34cd | 648 | |
61eb22d3 UD |
649 | /* If we have no further argument the program was called incorrectly. |
650 | Grant the user some education. */ | |
651 | if (_dl_argc < 2) | |
35fc382a | 652 | _dl_fatal_printf ("\ |
2bcf29ba | 653 | Usage: ld.so [OPTION]... EXECUTABLE-FILE [ARGS-FOR-PROGRAM...]\n\ |
61eb22d3 UD |
654 | You have invoked `ld.so', the helper program for shared library executables.\n\ |
655 | This program usually lives in the file `/lib/ld.so', and special directives\n\ | |
656 | in executable files using ELF shared libraries tell the system's program\n\ | |
657 | loader to load the helper program from this file. This helper program loads\n\ | |
658 | the shared libraries needed by the program executable, prepares the program\n\ | |
659 | to run, and runs it. You may invoke this helper program directly from the\n\ | |
660 | command line to load and run an ELF executable file; this is like executing\n\ | |
661 | that file itself, but always uses this helper program from the file you\n\ | |
662 | specified, instead of the helper program file specified in the executable\n\ | |
663 | file you run. This is mostly of use for maintainers to test new versions\n\ | |
2bcf29ba UD |
664 | of this helper program; chances are you did not intend to run this program.\n\ |
665 | \n\ | |
b0a01055 UD |
666 | --list list all dependencies and how they are resolved\n\ |
667 | --verify verify that given object really is a dynamically linked\n\ | |
e8b1163e | 668 | object we can handle\n\ |
b0a01055 UD |
669 | --library-path PATH use given PATH instead of content of the environment\n\ |
670 | variable LD_LIBRARY_PATH\n\ | |
fcf70d41 | 671 | --inhibit-rpath LIST ignore RUNPATH and RPATH information in object names\n\ |
35fc382a | 672 | in LIST\n"); |
61eb22d3 | 673 | |
0200214b RM |
674 | ++_dl_skip_args; |
675 | --_dl_argc; | |
e6caf4e1 | 676 | ++INTUSE(_dl_argv); |
91f62ce6 | 677 | |
da832465 UD |
678 | /* Initialize the data structures for the search paths for shared |
679 | objects. */ | |
680 | _dl_init_paths (library_path); | |
681 | ||
9a821cf9 | 682 | if (__builtin_expect (mode, normal) == verify) |
2de99474 | 683 | { |
8e17ea58 UD |
684 | const char *objname; |
685 | const char *err_str = NULL; | |
993b3242 | 686 | struct map_args args; |
2de99474 | 687 | |
e6caf4e1 | 688 | args.str = rtld_progname; |
cff26a3e | 689 | (void) INTUSE(_dl_catch_error) (&objname, &err_str, map_doit, &args); |
8e17ea58 | 690 | if (__builtin_expect (err_str != NULL, 0)) |
e6caf4e1 UD |
691 | /* We don't free the returned string, the programs stops |
692 | anyway. */ | |
693 | _exit (EXIT_FAILURE); | |
2de99474 UD |
694 | } |
695 | else | |
db276fa1 UD |
696 | { |
697 | HP_TIMING_NOW (start); | |
e6caf4e1 | 698 | INTUSE(_dl_map_object) (NULL, rtld_progname, 0, lt_library, 0, 0); |
db276fa1 | 699 | HP_TIMING_NOW (stop); |
61e0617a | 700 | |
db276fa1 UD |
701 | HP_TIMING_DIFF (load_time, start, stop); |
702 | } | |
2de99474 | 703 | |
d6b5d570 UD |
704 | phdr = GL(dl_loaded)->l_phdr; |
705 | phnum = GL(dl_loaded)->l_phnum; | |
143e2b96 UD |
706 | /* We overwrite here a pointer to a malloc()ed string. But since |
707 | the malloc() implementation used at this point is the dummy | |
708 | implementations which has no real free() function it does not | |
709 | makes sense to free the old string first. */ | |
d6b5d570 UD |
710 | GL(dl_loaded)->l_name = (char *) ""; |
711 | *user_entry = GL(dl_loaded)->l_entry; | |
0200214b RM |
712 | } |
713 | else | |
714 | { | |
715 | /* Create a link_map for the executable itself. | |
716 | This will be what dlopen on "" returns. */ | |
87c812c2 | 717 | _dl_new_object ((char *) "", "", lt_executable, NULL); |
d6b5d570 | 718 | if (GL(dl_loaded) == NULL) |
35fc382a | 719 | _dl_fatal_printf ("cannot allocate memory for link map\n"); |
d6b5d570 UD |
720 | GL(dl_loaded)->l_phdr = phdr; |
721 | GL(dl_loaded)->l_phnum = phnum; | |
722 | GL(dl_loaded)->l_entry = *user_entry; | |
da832465 | 723 | |
61e0617a UD |
724 | /* At this point we are in a bit of trouble. We would have to |
725 | fill in the values for l_dev and l_ino. But in general we | |
726 | do not know where the file is. We also do not handle AT_EXECFD | |
727 | even if it would be passed up. | |
728 | ||
729 | We leave the values here defined to 0. This is normally no | |
730 | problem as the program code itself is normally no shared | |
731 | object and therefore cannot be loaded dynamically. Nothing | |
732 | prevent the use of dynamic binaries and in these situations | |
733 | we might get problems. We might not be able to find out | |
734 | whether the object is already loaded. But since there is no | |
735 | easy way out and because the dynamic binary must also not | |
736 | have an SONAME we ignore this program for now. If it becomes | |
737 | a problem we can force people using SONAMEs. */ | |
738 | ||
97a51d8a UD |
739 | /* We delay initializing the path structure until we got the dynamic |
740 | information for the program. */ | |
0200214b RM |
741 | } |
742 | ||
d6b5d570 | 743 | GL(dl_loaded)->l_map_end = 0; |
052b6a6c | 744 | /* Perhaps the executable has no PT_LOAD header entries at all. */ |
d6b5d570 | 745 | GL(dl_loaded)->l_map_start = ~0; |
e7beef5f | 746 | /* We opened the file, account for it. */ |
d6b5d570 | 747 | ++GL(dl_loaded)->l_opencount; |
052b6a6c | 748 | |
0200214b | 749 | /* Scan the program header table for the dynamic section. */ |
72f70279 | 750 | for (ph = phdr; ph < &phdr[phnum]; ++ph) |
0200214b RM |
751 | switch (ph->p_type) |
752 | { | |
da832465 UD |
753 | case PT_PHDR: |
754 | /* Find out the load address. */ | |
d6b5d570 | 755 | GL(dl_loaded)->l_addr = (ElfW(Addr)) phdr - ph->p_vaddr; |
da832465 | 756 | break; |
0200214b RM |
757 | case PT_DYNAMIC: |
758 | /* This tells us where to find the dynamic section, | |
759 | which tells us everything we need to do. */ | |
d6b5d570 | 760 | GL(dl_loaded)->l_ld = (void *) GL(dl_loaded)->l_addr + ph->p_vaddr; |
0200214b RM |
761 | break; |
762 | case PT_INTERP: | |
763 | /* This "interpreter segment" was used by the program loader to | |
764 | find the program interpreter, which is this program itself, the | |
765 | dynamic linker. We note what name finds us, so that a future | |
766 | dlopen call or DT_NEEDED entry, for something that wants to link | |
767 | against the dynamic linker as a shared library, will know that | |
768 | the shared object is already loaded. */ | |
d6b5d570 | 769 | _dl_rtld_libname.name = ((const char *) GL(dl_loaded)->l_addr |
be935610 | 770 | + ph->p_vaddr); |
752a2a50 | 771 | /* _dl_rtld_libname.next = NULL; Already zero. */ |
d6b5d570 | 772 | GL(dl_rtld_map).l_libname = &_dl_rtld_libname; |
f41c8091 UD |
773 | |
774 | /* Ordinarilly, we would get additional names for the loader from | |
775 | our DT_SONAME. This can't happen if we were actually linked as | |
776 | a static executable (detect this case when we have no DYNAMIC). | |
777 | If so, assume the filename component of the interpreter path to | |
778 | be our SONAME, and add it to our name list. */ | |
d6b5d570 | 779 | if (GL(dl_rtld_map).l_ld == NULL) |
f41c8091 | 780 | { |
88794e30 UD |
781 | const char *p = NULL; |
782 | const char *cp = _dl_rtld_libname.name; | |
783 | ||
784 | /* Find the filename part of the path. */ | |
785 | while (*cp != '\0') | |
786 | if (*cp++ == '/') | |
787 | p = cp; | |
788 | ||
789 | if (p != NULL) | |
f41c8091 | 790 | { |
88794e30 | 791 | _dl_rtld_libname2.name = p; |
752a2a50 | 792 | /* _dl_rtld_libname2.next = NULL; Already zero. */ |
f41c8091 UD |
793 | _dl_rtld_libname.next = &_dl_rtld_libname2; |
794 | } | |
795 | } | |
796 | ||
164a7164 | 797 | has_interp = true; |
0200214b | 798 | break; |
052b6a6c | 799 | case PT_LOAD: |
052b6a6c UD |
800 | { |
801 | ElfW(Addr) mapstart; | |
2373b30e UD |
802 | ElfW(Addr) allocend; |
803 | ||
804 | /* Remember where the main program starts in memory. */ | |
d6b5d570 UD |
805 | mapstart = (GL(dl_loaded)->l_addr |
806 | + (ph->p_vaddr & ~(ph->p_align - 1))); | |
807 | if (GL(dl_loaded)->l_map_start > mapstart) | |
808 | GL(dl_loaded)->l_map_start = mapstart; | |
2373b30e UD |
809 | |
810 | /* Also where it ends. */ | |
d6b5d570 UD |
811 | allocend = GL(dl_loaded)->l_addr + ph->p_vaddr + ph->p_memsz; |
812 | if (GL(dl_loaded)->l_map_end < allocend) | |
813 | GL(dl_loaded)->l_map_end = allocend; | |
052b6a6c UD |
814 | } |
815 | break; | |
a2f1f5cb UD |
816 | #ifdef USE_TLS |
817 | case PT_TLS: | |
aed283dd UD |
818 | if (ph->p_memsz > 0) |
819 | { | |
820 | /* Note that in the case the dynamic linker we duplicate work | |
821 | here since we read the PT_TLS entry already in | |
822 | _dl_start_final. But the result is repeatable so do not | |
823 | check for this special but unimportant case. */ | |
824 | GL(dl_loaded)->l_tls_blocksize = ph->p_memsz; | |
825 | GL(dl_loaded)->l_tls_align = ph->p_align; | |
826 | GL(dl_loaded)->l_tls_initimage_size = ph->p_filesz; | |
827 | GL(dl_loaded)->l_tls_initimage = (void *) ph->p_vaddr; | |
828 | ||
829 | /* This image gets the ID one. */ | |
830 | GL(dl_tls_max_dtv_idx) = GL(dl_loaded)->l_tls_modid = 1; | |
831 | } | |
a2f1f5cb UD |
832 | break; |
833 | #endif | |
0200214b | 834 | } |
d6b5d570 UD |
835 | if (! GL(dl_loaded)->l_map_end) |
836 | GL(dl_loaded)->l_map_end = ~0; | |
837 | if (! GL(dl_rtld_map).l_libname && GL(dl_rtld_map).l_name) | |
c84142e8 UD |
838 | { |
839 | /* We were invoked directly, so the program might not have a | |
840 | PT_INTERP. */ | |
d6b5d570 | 841 | _dl_rtld_libname.name = GL(dl_rtld_map).l_name; |
3fb55878 | 842 | /* _dl_rtld_libname.next = NULL; Already zero. */ |
d6b5d570 | 843 | GL(dl_rtld_map).l_libname = &_dl_rtld_libname; |
c84142e8 | 844 | } |
ffee1316 | 845 | else |
d6b5d570 | 846 | assert (GL(dl_rtld_map).l_libname); /* How else did we get here? */ |
0200214b | 847 | |
9a51759b UD |
848 | if (! rtld_is_main) |
849 | { | |
850 | /* Extract the contents of the dynamic section for easy access. */ | |
d6b5d570 UD |
851 | elf_get_dynamic_info (GL(dl_loaded)); |
852 | if (GL(dl_loaded)->l_info[DT_HASH]) | |
9a51759b | 853 | /* Set up our cache of pointers into the hash table. */ |
d6b5d570 | 854 | _dl_setup_hash (GL(dl_loaded)); |
9a51759b | 855 | } |
0200214b | 856 | |
9a821cf9 | 857 | if (__builtin_expect (mode, normal) == verify) |
e2102c14 UD |
858 | { |
859 | /* We were called just to verify that this is a dynamic | |
860 | executable using us as the program interpreter. Exit with an | |
861 | error if we were not able to load the binary or no interpreter | |
862 | is specified (i.e., this is no dynamically linked binary. */ | |
d6b5d570 | 863 | if (GL(dl_loaded)->l_ld == NULL) |
e2102c14 | 864 | _exit (1); |
e2102c14 UD |
865 | |
866 | /* We allow here some platform specific code. */ | |
867 | #ifdef DISTINGUISH_LIB_VERSIONS | |
868 | DISTINGUISH_LIB_VERSIONS; | |
869 | #endif | |
eb406346 | 870 | _exit (has_interp ? 0 : 2); |
e2102c14 UD |
871 | } |
872 | ||
9a51759b | 873 | if (! rtld_is_main) |
97a51d8a UD |
874 | /* Initialize the data structures for the search paths for shared |
875 | objects. */ | |
120b4c49 | 876 | _dl_init_paths (library_path); |
97a51d8a | 877 | |
0200214b | 878 | /* Put the link_map for ourselves on the chain so it can be found by |
ceb2d9aa | 879 | name. Note that at this point the global chain of link maps contains |
d6b5d570 UD |
880 | exactly one element, which is pointed to by dl_loaded. */ |
881 | if (! GL(dl_rtld_map).l_name) | |
ffee1316 RM |
882 | /* If not invoked directly, the dynamic linker shared object file was |
883 | found by the PT_INTERP name. */ | |
d6b5d570 UD |
884 | GL(dl_rtld_map).l_name = (char *) GL(dl_rtld_map).l_libname->name; |
885 | GL(dl_rtld_map).l_type = lt_library; | |
886 | GL(dl_loaded)->l_next = &GL(dl_rtld_map); | |
887 | GL(dl_rtld_map).l_prev = GL(dl_loaded); | |
888 | ++GL(dl_nloaded); | |
0200214b | 889 | |
14bab8de | 890 | /* We have two ways to specify objects to preload: via environment |
49c091e5 | 891 | variable and via the file /etc/ld.so.preload. The latter can also |
14bab8de | 892 | be used when security is enabled. */ |
2064087b RM |
893 | preloads = NULL; |
894 | npreloads = 0; | |
14bab8de | 895 | |
db33f7d4 | 896 | if (__builtin_expect (preloadlist != NULL, 0)) |
c4029823 | 897 | { |
566efee2 UD |
898 | /* The LD_PRELOAD environment variable gives list of libraries |
899 | separated by white space or colons that are loaded before the | |
fd26970f UD |
900 | executable's dependencies and prepended to the global scope |
901 | list. If the binary is running setuid all elements | |
902 | containing a '/' are ignored since it is insecure. */ | |
903 | char *list = strdupa (preloadlist); | |
904 | char *p; | |
db276fa1 UD |
905 | |
906 | HP_TIMING_NOW (start); | |
907 | ||
9710f75d UD |
908 | /* Prevent optimizing strsep. Speed is not important here. */ |
909 | while ((p = (strsep) (&list, " :")) != NULL) | |
e2102c14 | 910 | if (p[0] != '\0' |
e6caf4e1 | 911 | && (__builtin_expect (! INTUSE(__libc_enable_secure), 1) |
db33f7d4 | 912 | || strchr (p, '/') == NULL)) |
fd26970f | 913 | { |
87837aac UD |
914 | struct link_map *new_map = INTUSE(_dl_map_object) (GL(dl_loaded), |
915 | p, 1, | |
916 | lt_library, | |
cff26a3e | 917 | 0, 0); |
42c4f32a | 918 | if (++new_map->l_opencount == 1) |
bd355af0 UD |
919 | /* It is no duplicate. */ |
920 | ++npreloads; | |
fd26970f | 921 | } |
db276fa1 UD |
922 | |
923 | HP_TIMING_NOW (stop); | |
924 | HP_TIMING_DIFF (diff, start, stop); | |
925 | HP_TIMING_ACCUM_NT (load_time, diff); | |
c4029823 UD |
926 | } |
927 | ||
14bab8de UD |
928 | /* Read the contents of the file. */ |
929 | file = _dl_sysdep_read_whole_file ("/etc/ld.so.preload", &file_size, | |
930 | PROT_READ | PROT_WRITE); | |
40b07f5b | 931 | if (__builtin_expect (file != MAP_FAILED, 0)) |
14bab8de UD |
932 | { |
933 | /* Parse the file. It contains names of libraries to be loaded, | |
934 | separated by white spaces or `:'. It may also contain | |
935 | comments introduced by `#'. */ | |
936 | char *problem; | |
937 | char *runp; | |
938 | size_t rest; | |
939 | ||
940 | /* Eliminate comments. */ | |
941 | runp = file; | |
942 | rest = file_size; | |
943 | while (rest > 0) | |
944 | { | |
945 | char *comment = memchr (runp, '#', rest); | |
946 | if (comment == NULL) | |
947 | break; | |
948 | ||
949 | rest -= comment - runp; | |
950 | do | |
951 | *comment = ' '; | |
952 | while (--rest > 0 && *++comment != '\n'); | |
953 | } | |
954 | ||
955 | /* We have one problematic case: if we have a name at the end of | |
956 | the file without a trailing terminating characters, we cannot | |
957 | place the \0. Handle the case separately. */ | |
49891c10 UD |
958 | if (file[file_size - 1] != ' ' && file[file_size - 1] != '\t' |
959 | && file[file_size - 1] != '\n' && file[file_size - 1] != ':') | |
14bab8de UD |
960 | { |
961 | problem = &file[file_size]; | |
962 | while (problem > file && problem[-1] != ' ' && problem[-1] != '\t' | |
49891c10 | 963 | && problem[-1] != '\n' && problem[-1] != ':') |
14bab8de UD |
964 | --problem; |
965 | ||
966 | if (problem > file) | |
967 | problem[-1] = '\0'; | |
968 | } | |
969 | else | |
49891c10 UD |
970 | { |
971 | problem = NULL; | |
972 | file[file_size - 1] = '\0'; | |
973 | } | |
14bab8de | 974 | |
db276fa1 UD |
975 | HP_TIMING_NOW (start); |
976 | ||
14bab8de UD |
977 | if (file != problem) |
978 | { | |
979 | char *p; | |
e2102c14 | 980 | runp = file; |
14bab8de | 981 | while ((p = strsep (&runp, ": \t\n")) != NULL) |
e2102c14 UD |
982 | if (p[0] != '\0') |
983 | { | |
cff26a3e AJ |
984 | struct link_map *new_map = INTUSE(_dl_map_object) (GL(dl_loaded), |
985 | p, 1, | |
986 | lt_library, | |
987 | 0, 0); | |
42c4f32a | 988 | if (++new_map->l_opencount == 1) |
e2102c14 UD |
989 | /* It is no duplicate. */ |
990 | ++npreloads; | |
991 | } | |
14bab8de UD |
992 | } |
993 | ||
994 | if (problem != NULL) | |
995 | { | |
996 | char *p = strndupa (problem, file_size - (problem - file)); | |
87837aac UD |
997 | struct link_map *new_map = INTUSE(_dl_map_object) (GL(dl_loaded), p, |
998 | 1, lt_library, | |
999 | 0, 0); | |
42c4f32a | 1000 | if (++new_map->l_opencount == 1) |
bd355af0 UD |
1001 | /* It is no duplicate. */ |
1002 | ++npreloads; | |
14bab8de UD |
1003 | } |
1004 | ||
db276fa1 UD |
1005 | HP_TIMING_NOW (stop); |
1006 | HP_TIMING_DIFF (diff, start, stop); | |
1007 | HP_TIMING_ACCUM_NT (load_time, diff); | |
1008 | ||
14bab8de UD |
1009 | /* We don't need the file anymore. */ |
1010 | __munmap (file, file_size); | |
1011 | } | |
1012 | ||
db33f7d4 | 1013 | if (__builtin_expect (npreloads, 0) != 0) |
14bab8de UD |
1014 | { |
1015 | /* Set up PRELOADS with a vector of the preloaded libraries. */ | |
1016 | struct link_map *l; | |
14bab8de | 1017 | preloads = __alloca (npreloads * sizeof preloads[0]); |
d6b5d570 | 1018 | l = GL(dl_rtld_map).l_next; /* End of the chain before preloads. */ |
14bab8de UD |
1019 | i = 0; |
1020 | do | |
1021 | { | |
1022 | preloads[i++] = l; | |
1023 | l = l->l_next; | |
1024 | } while (l); | |
1025 | assert (i == npreloads); | |
1026 | } | |
1027 | ||
2064087b RM |
1028 | /* Load all the libraries specified by DT_NEEDED entries. If LD_PRELOAD |
1029 | specified some libraries to load, these are inserted before the actual | |
1030 | dependencies in the executable's searchlist for symbol resolution. */ | |
db276fa1 | 1031 | HP_TIMING_NOW (start); |
87837aac UD |
1032 | INTUSE(_dl_map_object_deps) (GL(dl_loaded), preloads, npreloads, |
1033 | mode == trace, 0); | |
db276fa1 UD |
1034 | HP_TIMING_NOW (stop); |
1035 | HP_TIMING_DIFF (diff, start, stop); | |
1036 | HP_TIMING_ACCUM_NT (load_time, diff); | |
e3e35cfc | 1037 | |
42c4f32a UD |
1038 | /* Mark all objects as being in the global scope and set the open |
1039 | counter. */ | |
d6b5d570 | 1040 | for (i = GL(dl_loaded)->l_searchlist.r_nlist; i > 0; ) |
42c4f32a UD |
1041 | { |
1042 | --i; | |
d6b5d570 UD |
1043 | GL(dl_loaded)->l_searchlist.r_list[i]->l_global = 1; |
1044 | ++GL(dl_loaded)->l_searchlist.r_list[i]->l_opencount; | |
42c4f32a | 1045 | } |
d66e34cd | 1046 | |
2064087b | 1047 | #ifndef MAP_ANON |
f332db02 RM |
1048 | /* We are done mapping things, so close the zero-fill descriptor. */ |
1049 | __close (_dl_zerofd); | |
1050 | _dl_zerofd = -1; | |
2064087b | 1051 | #endif |
f332db02 | 1052 | |
f9496a7b | 1053 | /* Remove _dl_rtld_map from the chain. */ |
d6b5d570 UD |
1054 | GL(dl_rtld_map).l_prev->l_next = GL(dl_rtld_map).l_next; |
1055 | if (GL(dl_rtld_map).l_next) | |
1056 | GL(dl_rtld_map).l_next->l_prev = GL(dl_rtld_map).l_prev; | |
f9496a7b | 1057 | |
d6b5d570 | 1058 | if (__builtin_expect (GL(dl_rtld_map).l_opencount > 1, 1)) |
0200214b | 1059 | { |
f9496a7b RM |
1060 | /* Some DT_NEEDED entry referred to the interpreter object itself, so |
1061 | put it back in the list of visible objects. We insert it into the | |
1062 | chain in symbol search order because gdb uses the chain's order as | |
1063 | its symbol search order. */ | |
77aba05b | 1064 | i = 1; |
d6b5d570 | 1065 | while (GL(dl_loaded)->l_searchlist.r_list[i] != &GL(dl_rtld_map)) |
f9496a7b | 1066 | ++i; |
d6b5d570 | 1067 | GL(dl_rtld_map).l_prev = GL(dl_loaded)->l_searchlist.r_list[i - 1]; |
b2bcd61a | 1068 | if (__builtin_expect (mode, normal) == normal) |
d6b5d570 UD |
1069 | GL(dl_rtld_map).l_next = (i + 1 < GL(dl_loaded)->l_searchlist.r_nlist |
1070 | ? GL(dl_loaded)->l_searchlist.r_list[i + 1] | |
1071 | : NULL); | |
b2bcd61a UD |
1072 | else |
1073 | /* In trace mode there might be an invisible object (which we | |
1074 | could not find) after the previous one in the search list. | |
1075 | In this case it doesn't matter much where we put the | |
1076 | interpreter object, so we just initialize the list pointer so | |
1077 | that the assertion below holds. */ | |
d6b5d570 | 1078 | GL(dl_rtld_map).l_next = GL(dl_rtld_map).l_prev->l_next; |
b2bcd61a | 1079 | |
d6b5d570 UD |
1080 | assert (GL(dl_rtld_map).l_prev->l_next == GL(dl_rtld_map).l_next); |
1081 | GL(dl_rtld_map).l_prev->l_next = &GL(dl_rtld_map); | |
3fb55878 | 1082 | if (GL(dl_rtld_map).l_next != NULL) |
f9496a7b | 1083 | { |
d6b5d570 UD |
1084 | assert (GL(dl_rtld_map).l_next->l_prev == GL(dl_rtld_map).l_prev); |
1085 | GL(dl_rtld_map).l_next->l_prev = &GL(dl_rtld_map); | |
f9496a7b | 1086 | } |
0200214b | 1087 | } |
d66e34cd | 1088 | |
c84142e8 UD |
1089 | /* Now let us see whether all libraries are available in the |
1090 | versions we need. */ | |
1091 | { | |
993b3242 UD |
1092 | struct version_check_args args; |
1093 | args.doexit = mode == normal; | |
145b8413 | 1094 | args.dotrace = mode == trace; |
993b3242 | 1095 | _dl_receive_error (print_missing_version, version_check_doit, &args); |
c84142e8 UD |
1096 | } |
1097 | ||
bff334e0 UD |
1098 | #ifdef USE_TLS |
1099 | /* Now it is time to determine the layout of the static TLS block | |
1100 | and allocate it for the initial thread. Note that we always | |
1101 | allocate the static block, we never defer it even if no | |
1102 | DF_STATIC_TLS bit is set. The reason is that we know glibc will | |
1103 | use the static model. First add the dynamic linker to the list | |
1104 | if it also uses TLS. */ | |
1105 | if (GL(dl_rtld_map).l_tls_blocksize != 0) | |
1106 | /* Assign a module ID. */ | |
1107 | GL(dl_rtld_map).l_tls_modid = _dl_next_tls_modid (); | |
1108 | ||
1109 | # ifndef SHARED | |
1110 | /* If dynamic loading of modules with TLS is impossible we do not | |
1111 | have to initialize any of the TLS functionality unless any of the | |
1112 | initial modules uses TLS. */ | |
1113 | if (GL(dl_tls_max_dtv_idx) > 0) | |
1114 | # endif | |
1115 | { | |
1116 | struct link_map *l; | |
1117 | size_t nelem; | |
1118 | struct dtv_slotinfo *slotinfo; | |
1119 | ||
1120 | /* Number of elements in the static TLS block. */ | |
1121 | GL(dl_tls_static_nelem) = GL(dl_tls_max_dtv_idx); | |
1122 | ||
1123 | /* Allocate the array which contains the information about the | |
1124 | dtv slots. We allocate a few entries more than needed to | |
1125 | avoid the need for reallocation. */ | |
1126 | nelem = GL(dl_tls_max_dtv_idx) + 1 + TLS_SLOTINFO_SURPLUS; | |
1127 | ||
1128 | /* Allocate. */ | |
1129 | GL(dl_tls_dtv_slotinfo_list) = (struct dtv_slotinfo_list *) | |
1130 | malloc (sizeof (struct dtv_slotinfo_list) | |
1131 | + nelem * sizeof (struct dtv_slotinfo)); | |
1132 | /* No need to check the return value. If memory allocation failed | |
1133 | the program would have been terminated. */ | |
1134 | ||
1135 | slotinfo = memset (GL(dl_tls_dtv_slotinfo_list)->slotinfo, '\0', | |
1136 | nelem * sizeof (struct dtv_slotinfo)); | |
1137 | GL(dl_tls_dtv_slotinfo_list)->len = nelem; | |
1138 | GL(dl_tls_dtv_slotinfo_list)->next = NULL; | |
1139 | ||
1140 | /* Fill in the information from the loaded modules. */ | |
1141 | for (l = GL(dl_loaded), i = 0; l != NULL; l = l->l_next) | |
1142 | if (l->l_tls_blocksize != 0) | |
1143 | /* This is a module with TLS data. Store the map reference. | |
1144 | The generation counter is zero. */ | |
1145 | slotinfo[++i].map = l; | |
1146 | assert (i == GL(dl_tls_max_dtv_idx)); | |
1147 | ||
935f95dd | 1148 | /* Compute the TLS offsets for the various blocks. We call this |
bff334e0 UD |
1149 | function even if none of the modules available at startup time |
1150 | uses TLS to initialize some variables. */ | |
1151 | _dl_determine_tlsoffset (); | |
1152 | ||
1153 | /* Construct the static TLS block and the dtv for the initial | |
1154 | thread. For some platforms this will include allocating memory | |
1155 | for the thread descriptor. The memory for the TLS block will | |
1156 | never be freed. It should be allocated accordingly. The dtv | |
1157 | array can be changed if dynamic loading requires it. */ | |
a816b435 | 1158 | tcbp = _dl_allocate_tls_storage (); |
bff334e0 UD |
1159 | if (tcbp == NULL) |
1160 | _dl_fatal_printf ("\ | |
935f95dd | 1161 | cannot allocate TLS data structures for initial thread"); |
08da0621 RM |
1162 | |
1163 | /* Store for detection of the special case by __tls_get_addr | |
1164 | so it knows not to pass this dtv to the normal realloc. */ | |
8784cc18 | 1165 | GL(dl_initial_dtv) = GET_DTV (tcbp); |
bff334e0 UD |
1166 | } |
1167 | #endif | |
1168 | ||
9a821cf9 | 1169 | if (__builtin_expect (mode, normal) != normal) |
0200214b RM |
1170 | { |
1171 | /* We were run just to list the shared libraries. It is | |
1172 | important that we do this before real relocation, because the | |
1173 | functions we call below for output may no longer work properly | |
1174 | after relocation. */ | |
d6b5d570 | 1175 | if (! GL(dl_loaded)->l_info[DT_NEEDED]) |
35fc382a | 1176 | _dl_printf ("\tstatically linked\n"); |
0200214b | 1177 | else |
ceb2d9aa UD |
1178 | { |
1179 | struct link_map *l; | |
1180 | ||
d6b5d570 | 1181 | if (GL(dl_debug_mask) & DL_DEBUG_PRELINK) |
32e6df36 | 1182 | { |
d6b5d570 | 1183 | struct r_scope_elem *scope = &GL(dl_loaded)->l_searchlist; |
32e6df36 UD |
1184 | |
1185 | for (i = 0; i < scope->r_nlist; i++) | |
1186 | { | |
1187 | l = scope->r_list [i]; | |
1188 | if (l->l_faked) | |
1189 | { | |
1190 | _dl_printf ("\t%s => not found\n", l->l_libname->name); | |
1191 | continue; | |
1192 | } | |
d6b5d570 UD |
1193 | if (_dl_name_match_p (GL(dl_trace_prelink), l)) |
1194 | GL(dl_trace_prelink_map) = l; | |
bff334e0 | 1195 | _dl_printf ("\t%s => %s (0x%0*Zx, 0x%0*Zx)", |
32e6df36 | 1196 | l->l_libname->name[0] ? l->l_libname->name |
e6caf4e1 | 1197 | : rtld_progname ?: "<main program>", |
32e6df36 | 1198 | l->l_name[0] ? l->l_name |
e6caf4e1 | 1199 | : rtld_progname ?: "<main program>", |
32e6df36 UD |
1200 | (int) sizeof l->l_map_start * 2, |
1201 | l->l_map_start, | |
1202 | (int) sizeof l->l_addr * 2, | |
1203 | l->l_addr); | |
bff334e0 UD |
1204 | #ifdef USE_TLS |
1205 | if (l->l_tls_modid) | |
1206 | _dl_printf (" TLS(0x%Zx, 0x%0*Zx)\n", l->l_tls_modid, | |
1207 | (int) sizeof l->l_tls_offset * 2, | |
1208 | l->l_tls_offset); | |
1209 | else | |
1210 | #endif | |
1211 | _dl_printf ("\n"); | |
32e6df36 UD |
1212 | } |
1213 | } | |
1214 | else | |
1215 | { | |
d6b5d570 | 1216 | for (l = GL(dl_loaded)->l_next; l; l = l->l_next) |
32e6df36 UD |
1217 | if (l->l_faked) |
1218 | /* The library was not found. */ | |
1219 | _dl_printf ("\t%s => not found\n", l->l_libname->name); | |
1220 | else | |
1221 | _dl_printf ("\t%s => %s (0x%0*Zx)\n", l->l_libname->name, | |
1222 | l->l_name, (int) sizeof l->l_map_start * 2, | |
1223 | l->l_map_start); | |
1224 | } | |
ceb2d9aa | 1225 | } |
1a3a58fd | 1226 | |
9a821cf9 | 1227 | if (__builtin_expect (mode, trace) != trace) |
5a47e7f2 | 1228 | for (i = 1; i < (unsigned int) _dl_argc; ++i) |
cddcfecf RM |
1229 | { |
1230 | const ElfW(Sym) *ref = NULL; | |
c0282c06 UD |
1231 | ElfW(Addr) loadbase; |
1232 | lookup_t result; | |
c0282c06 | 1233 | |
e6caf4e1 UD |
1234 | result = INTUSE(_dl_lookup_symbol) (INTUSE(_dl_argv)[i], |
1235 | GL(dl_loaded), | |
cff26a3e AJ |
1236 | &ref, GL(dl_loaded)->l_scope, |
1237 | ELF_RTYPE_CLASS_PLT, 1); | |
c0282c06 UD |
1238 | |
1239 | loadbase = LOOKUP_VALUE_ADDRESS (result); | |
1240 | ||
35fc382a | 1241 | _dl_printf ("%s found at 0x%0*Zd in object at 0x%0*Zd\n", |
e6caf4e1 | 1242 | INTUSE(_dl_argv)[i], |
8a0746ae RM |
1243 | (int) sizeof ref->st_value * 2, ref->st_value, |
1244 | (int) sizeof loadbase * 2, loadbase); | |
cddcfecf | 1245 | } |
ce37fa88 | 1246 | else |
fd26970f | 1247 | { |
667b0577 | 1248 | /* If LD_WARN is set warn about undefined symbols. */ |
5688da55 | 1249 | if (GL(dl_lazy) >= 0 && GL(dl_verbose)) |
ce37fa88 UD |
1250 | { |
1251 | /* We have to do symbol dependency testing. */ | |
1252 | struct relocate_args args; | |
1253 | struct link_map *l; | |
993b3242 | 1254 | |
5688da55 | 1255 | args.lazy = GL(dl_lazy); |
fd26970f | 1256 | |
d6b5d570 | 1257 | l = GL(dl_loaded); |
ce37fa88 UD |
1258 | while (l->l_next) |
1259 | l = l->l_next; | |
1260 | do | |
1261 | { | |
d6b5d570 | 1262 | if (l != &GL(dl_rtld_map) && ! l->l_faked) |
ce37fa88 UD |
1263 | { |
1264 | args.l = l; | |
1265 | _dl_receive_error (print_unresolved, relocate_doit, | |
1266 | &args); | |
ce37fa88 UD |
1267 | } |
1268 | l = l->l_prev; | |
1269 | } while (l); | |
32e6df36 | 1270 | |
d6b5d570 UD |
1271 | if ((GL(dl_debug_mask) & DL_DEBUG_PRELINK) |
1272 | && GL(dl_rtld_map).l_opencount > 1) | |
cff26a3e AJ |
1273 | INTUSE(_dl_relocate_object) (&GL(dl_rtld_map), |
1274 | GL(dl_loaded)->l_scope, 0, 0); | |
ce37fa88 UD |
1275 | } |
1276 | ||
b0982c4a | 1277 | #define VERNEEDTAG (DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGIDX (DT_VERNEED)) |
120b4c49 | 1278 | if (version_info) |
fd26970f | 1279 | { |
ce37fa88 UD |
1280 | /* Print more information. This means here, print information |
1281 | about the versions needed. */ | |
1282 | int first = 1; | |
d6b5d570 | 1283 | struct link_map *map = GL(dl_loaded); |
ce37fa88 | 1284 | |
d6b5d570 | 1285 | for (map = GL(dl_loaded); map != NULL; map = map->l_next) |
fd26970f | 1286 | { |
f41c8091 | 1287 | const char *strtab; |
ce37fa88 | 1288 | ElfW(Dyn) *dyn = map->l_info[VERNEEDTAG]; |
f41c8091 UD |
1289 | ElfW(Verneed) *ent; |
1290 | ||
1291 | if (dyn == NULL) | |
1292 | continue; | |
1293 | ||
a42195db | 1294 | strtab = (const void *) D_PTR (map, l_info[DT_STRTAB]); |
f41c8091 | 1295 | ent = (ElfW(Verneed) *) (map->l_addr + dyn->d_un.d_ptr); |
ce37fa88 | 1296 | |
f41c8091 | 1297 | if (first) |
ce37fa88 | 1298 | { |
35fc382a | 1299 | _dl_printf ("\n\tVersion information:\n"); |
f41c8091 UD |
1300 | first = 0; |
1301 | } | |
ce37fa88 | 1302 | |
35fc382a | 1303 | _dl_printf ("\t%s:\n", |
e6caf4e1 | 1304 | map->l_name[0] ? map->l_name : rtld_progname); |
f41c8091 UD |
1305 | |
1306 | while (1) | |
1307 | { | |
1308 | ElfW(Vernaux) *aux; | |
1309 | struct link_map *needed; | |
ce37fa88 | 1310 | |
f41c8091 UD |
1311 | needed = find_needed (strtab + ent->vn_file); |
1312 | aux = (ElfW(Vernaux) *) ((char *) ent + ent->vn_aux); | |
ce37fa88 UD |
1313 | |
1314 | while (1) | |
1315 | { | |
f41c8091 UD |
1316 | const char *fname = NULL; |
1317 | ||
f41c8091 | 1318 | if (needed != NULL |
ba9fcb3f UD |
1319 | && match_version (strtab + aux->vna_name, |
1320 | needed)) | |
f41c8091 UD |
1321 | fname = needed->l_name; |
1322 | ||
35fc382a UD |
1323 | _dl_printf ("\t\t%s (%s) %s=> %s\n", |
1324 | strtab + ent->vn_file, | |
1325 | strtab + aux->vna_name, | |
1326 | aux->vna_flags & VER_FLG_WEAK | |
1327 | ? "[WEAK] " : "", | |
1328 | fname ?: "not found"); | |
ce37fa88 | 1329 | |
f41c8091 UD |
1330 | if (aux->vna_next == 0) |
1331 | /* No more symbols. */ | |
ce37fa88 UD |
1332 | break; |
1333 | ||
f41c8091 UD |
1334 | /* Next symbol. */ |
1335 | aux = (ElfW(Vernaux) *) ((char *) aux | |
1336 | + aux->vna_next); | |
ce37fa88 | 1337 | } |
f41c8091 UD |
1338 | |
1339 | if (ent->vn_next == 0) | |
1340 | /* No more dependencies. */ | |
1341 | break; | |
1342 | ||
1343 | /* Next dependency. */ | |
1344 | ent = (ElfW(Verneed) *) ((char *) ent + ent->vn_next); | |
ce37fa88 | 1345 | } |
fd26970f | 1346 | } |
ce37fa88 | 1347 | } |
fd26970f | 1348 | } |
d66e34cd | 1349 | |
0200214b RM |
1350 | _exit (0); |
1351 | } | |
86d2c878 | 1352 | |
d6b5d570 UD |
1353 | if (GL(dl_loaded)->l_info [ADDRIDX (DT_GNU_LIBLIST)] |
1354 | && ! __builtin_expect (GL(dl_profile) != NULL, 0)) | |
32e6df36 UD |
1355 | { |
1356 | ElfW(Lib) *liblist, *liblistend; | |
1357 | struct link_map **r_list, **r_listend, *l; | |
9710f75d UD |
1358 | const char *strtab = (const void *) D_PTR (GL(dl_loaded), |
1359 | l_info[DT_STRTAB]); | |
32e6df36 | 1360 | |
d6b5d570 | 1361 | assert (GL(dl_loaded)->l_info [VALIDX (DT_GNU_LIBLISTSZ)] != NULL); |
32e6df36 | 1362 | liblist = (ElfW(Lib) *) |
d6b5d570 | 1363 | GL(dl_loaded)->l_info [ADDRIDX (DT_GNU_LIBLIST)]->d_un.d_ptr; |
32e6df36 UD |
1364 | liblistend = (ElfW(Lib) *) |
1365 | ((char *) liblist | |
d6b5d570 UD |
1366 | + GL(dl_loaded)->l_info [VALIDX (DT_GNU_LIBLISTSZ)]->d_un.d_val); |
1367 | r_list = GL(dl_loaded)->l_searchlist.r_list; | |
1368 | r_listend = r_list + GL(dl_loaded)->l_searchlist.r_nlist; | |
32e6df36 UD |
1369 | |
1370 | for (; r_list < r_listend && liblist < liblistend; r_list++) | |
1371 | { | |
1372 | l = *r_list; | |
1373 | ||
d6b5d570 | 1374 | if (l == GL(dl_loaded)) |
32e6df36 UD |
1375 | continue; |
1376 | ||
1377 | /* If the library is not mapped where it should, fail. */ | |
1378 | if (l->l_addr) | |
1379 | break; | |
1380 | ||
1381 | /* Next, check if checksum matches. */ | |
1382 | if (l->l_info [VALIDX(DT_CHECKSUM)] == NULL | |
1383 | || l->l_info [VALIDX(DT_CHECKSUM)]->d_un.d_val | |
1384 | != liblist->l_checksum) | |
1385 | break; | |
1386 | ||
1387 | if (l->l_info [VALIDX(DT_GNU_PRELINKED)] == NULL | |
1388 | || l->l_info [VALIDX(DT_GNU_PRELINKED)]->d_un.d_val | |
1389 | != liblist->l_time_stamp) | |
1390 | break; | |
1391 | ||
1392 | if (! _dl_name_match_p (strtab + liblist->l_name, l)) | |
1393 | break; | |
1394 | ||
1395 | ++liblist; | |
1396 | } | |
1397 | ||
1398 | ||
1399 | if (r_list == r_listend && liblist == liblistend) | |
164a7164 | 1400 | prelinked = true; |
32e6df36 | 1401 | |
d6b5d570 | 1402 | if (__builtin_expect (GL(dl_debug_mask) & DL_DEBUG_LIBS, 0)) |
32e6df36 UD |
1403 | _dl_printf ("\nprelink checking: %s\n", prelinked ? "ok" : "failed"); |
1404 | } | |
1405 | ||
1406 | if (prelinked) | |
1407 | { | |
d6b5d570 | 1408 | if (GL(dl_loaded)->l_info [ADDRIDX (DT_GNU_CONFLICT)] != NULL) |
32e6df36 UD |
1409 | { |
1410 | ElfW(Rela) *conflict, *conflictend; | |
1411 | #ifndef HP_TIMING_NONAVAIL | |
1412 | hp_timing_t start; | |
1413 | hp_timing_t stop; | |
1414 | #endif | |
1415 | ||
1416 | HP_TIMING_NOW (start); | |
d6b5d570 | 1417 | assert (GL(dl_loaded)->l_info [VALIDX (DT_GNU_CONFLICTSZ)] != NULL); |
32e6df36 | 1418 | conflict = (ElfW(Rela) *) |
d6b5d570 | 1419 | GL(dl_loaded)->l_info [ADDRIDX (DT_GNU_CONFLICT)]->d_un.d_ptr; |
32e6df36 UD |
1420 | conflictend = (ElfW(Rela) *) |
1421 | ((char *) conflict | |
d6b5d570 UD |
1422 | + GL(dl_loaded)->l_info [VALIDX (DT_GNU_CONFLICTSZ)]->d_un.d_val); |
1423 | _dl_resolve_conflicts (GL(dl_loaded), conflict, conflictend); | |
32e6df36 UD |
1424 | HP_TIMING_NOW (stop); |
1425 | HP_TIMING_DIFF (relocate_time, start, stop); | |
1426 | } | |
1427 | ||
1428 | _dl_sysdep_start_cleanup (); | |
1429 | } | |
1430 | else | |
164a7164 UD |
1431 | { |
1432 | /* Now we have all the objects loaded. Relocate them all except for | |
1433 | the dynamic linker itself. We do this in reverse order so that copy | |
1434 | relocs of earlier objects overwrite the data written by later | |
1435 | objects. We do not re-relocate the dynamic linker itself in this | |
1436 | loop because that could result in the GOT entries for functions we | |
1437 | call being changed, and that would break us. It is safe to relocate | |
1438 | the dynamic linker out of order because it has no copy relocs (we | |
1439 | know that because it is self-contained). */ | |
1440 | ||
1441 | struct link_map *l; | |
1442 | int consider_profiling = GL(dl_profile) != NULL; | |
8b07d6a8 | 1443 | #ifndef HP_TIMING_NONAVAIL |
164a7164 UD |
1444 | hp_timing_t start; |
1445 | hp_timing_t stop; | |
1446 | hp_timing_t add; | |
8b07d6a8 | 1447 | #endif |
c0fb8a56 | 1448 | |
164a7164 UD |
1449 | /* If we are profiling we also must do lazy reloaction. */ |
1450 | GL(dl_lazy) |= consider_profiling; | |
c0fb8a56 | 1451 | |
164a7164 UD |
1452 | l = GL(dl_loaded); |
1453 | while (l->l_next) | |
1454 | l = l->l_next; | |
db276fa1 | 1455 | |
164a7164 UD |
1456 | HP_TIMING_NOW (start); |
1457 | do | |
1458 | { | |
1459 | /* While we are at it, help the memory handling a bit. We have to | |
1460 | mark some data structures as allocated with the fake malloc() | |
1461 | implementation in ld.so. */ | |
1462 | struct libname_list *lnp = l->l_libname->next; | |
752a2a50 | 1463 | |
164a7164 UD |
1464 | while (__builtin_expect (lnp != NULL, 0)) |
1465 | { | |
1466 | lnp->dont_free = 1; | |
1467 | lnp = lnp->next; | |
1468 | } | |
752a2a50 | 1469 | |
164a7164 | 1470 | if (l != &GL(dl_rtld_map)) |
cff26a3e AJ |
1471 | INTUSE(_dl_relocate_object) (l, l->l_scope, GL(dl_lazy), |
1472 | consider_profiling); | |
be935610 | 1473 | |
164a7164 UD |
1474 | l = l->l_prev; |
1475 | } | |
1476 | while (l); | |
1477 | HP_TIMING_NOW (stop); | |
1478 | ||
1479 | HP_TIMING_DIFF (relocate_time, start, stop); | |
1480 | ||
1481 | /* Do any necessary cleanups for the startup OS interface code. | |
1482 | We do these now so that no calls are made after rtld re-relocation | |
1483 | which might be resolved to different functions than we expect. | |
1484 | We cannot do this before relocating the other objects because | |
1485 | _dl_relocate_object might need to call `mprotect' for DT_TEXTREL. */ | |
1486 | _dl_sysdep_start_cleanup (); | |
1487 | ||
1488 | /* Now enable profiling if needed. Like the previous call, | |
1489 | this has to go here because the calls it makes should use the | |
1490 | rtld versions of the functions (particularly calloc()), but it | |
1491 | needs to have _dl_profile_map set up by the relocator. */ | |
1492 | if (__builtin_expect (GL(dl_profile_map) != NULL, 0)) | |
1493 | /* We must prepare the profiling. */ | |
cff26a3e | 1494 | INTUSE(_dl_start_profile) (GL(dl_profile_map), GL(dl_profile_output)); |
164a7164 UD |
1495 | |
1496 | if (GL(dl_rtld_map).l_opencount > 1) | |
1497 | { | |
1498 | /* There was an explicit ref to the dynamic linker as a shared lib. | |
1499 | Re-relocate ourselves with user-controlled symbol definitions. */ | |
1500 | HP_TIMING_NOW (start); | |
cff26a3e AJ |
1501 | INTUSE(_dl_relocate_object) (&GL(dl_rtld_map), GL(dl_loaded)->l_scope, |
1502 | 0, 0); | |
164a7164 UD |
1503 | HP_TIMING_NOW (stop); |
1504 | HP_TIMING_DIFF (add, start, stop); | |
1505 | HP_TIMING_ACCUM_NT (relocate_time, add); | |
1506 | } | |
1507 | } | |
ac16e905 | 1508 | |
be935610 | 1509 | /* Now set up the variable which helps the assembler startup code. */ |
d6b5d570 UD |
1510 | GL(dl_main_searchlist) = &GL(dl_loaded)->l_searchlist; |
1511 | GL(dl_global_scope)[0] = &GL(dl_loaded)->l_searchlist; | |
be935610 | 1512 | |
32e6df36 | 1513 | /* Save the information about the original global scope list since |
604510f7 | 1514 | we need it in the memory handling later. */ |
d6b5d570 | 1515 | GL(dl_initial_searchlist) = *GL(dl_main_searchlist); |
604510f7 | 1516 | |
a816b435 RM |
1517 | #ifdef USE_TLS |
1518 | # ifndef SHARED | |
1519 | if (GL(dl_tls_max_dtv_idx) > 0) | |
1520 | # endif | |
1521 | { | |
1522 | /* Now that we have completed relocation, the initializer data | |
1523 | for the TLS blocks has its final values and we can copy them | |
1524 | into the main thread's TLS area, which we allocated above. */ | |
1525 | _dl_allocate_tls_init (tcbp); | |
1526 | ||
1527 | /* And finally install it for the main thread. */ | |
9d69bd24 UD |
1528 | # ifndef HAVE___THREAD |
1529 | TLS_INIT_TP (tcbp, GL(dl_rtld_map).l_tls_tp_initialized); | |
1530 | # else | |
1531 | /* If the compiler supports the __thread keyword we know that | |
1532 | at least ld.so itself uses TLS and therefore the thread | |
1533 | pointer was initialized earlier. */ | |
1534 | assert (GL(dl_rtld_map).l_tls_tp_initialized != 0); | |
1535 | TLS_INIT_TP (tcbp, 1); | |
1536 | # endif | |
a816b435 RM |
1537 | } |
1538 | #endif | |
1539 | ||
4d6acc61 RM |
1540 | { |
1541 | /* Initialize _r_debug. */ | |
d6b5d570 | 1542 | struct r_debug *r = _dl_debug_initialize (GL(dl_rtld_map).l_addr); |
ceb2d9aa | 1543 | struct link_map *l; |
4d6acc61 | 1544 | |
d6b5d570 | 1545 | l = GL(dl_loaded); |
ec42724d RM |
1546 | |
1547 | #ifdef ELF_MACHINE_DEBUG_SETUP | |
1548 | ||
1549 | /* Some machines (e.g. MIPS) don't use DT_DEBUG in this way. */ | |
1550 | ||
1551 | ELF_MACHINE_DEBUG_SETUP (l, r); | |
d6b5d570 | 1552 | ELF_MACHINE_DEBUG_SETUP (&GL(dl_rtld_map), r); |
ec42724d RM |
1553 | |
1554 | #else | |
1555 | ||
3fb55878 | 1556 | if (l->l_info[DT_DEBUG] != NULL) |
4d6acc61 RM |
1557 | /* There is a DT_DEBUG entry in the dynamic section. Fill it in |
1558 | with the run-time address of the r_debug structure */ | |
1559 | l->l_info[DT_DEBUG]->d_un.d_ptr = (ElfW(Addr)) r; | |
1560 | ||
d746b89c RM |
1561 | /* Fill in the pointer in the dynamic linker's own dynamic section, in |
1562 | case you run gdb on the dynamic linker directly. */ | |
3fb55878 | 1563 | if (GL(dl_rtld_map).l_info[DT_DEBUG] != NULL) |
d6b5d570 | 1564 | GL(dl_rtld_map).l_info[DT_DEBUG]->d_un.d_ptr = (ElfW(Addr)) r; |
d746b89c | 1565 | |
ec42724d RM |
1566 | #endif |
1567 | ||
4d6acc61 RM |
1568 | /* Notify the debugger that all objects are now mapped in. */ |
1569 | r->r_state = RT_ADD; | |
cff26a3e | 1570 | INTUSE(_dl_debug_state) (); |
4d6acc61 | 1571 | } |
0200214b | 1572 | |
08cac4ac UD |
1573 | #ifndef MAP_COPY |
1574 | /* We must munmap() the cache file. */ | |
cff26a3e | 1575 | INTUSE(_dl_unload_cache) (); |
08cac4ac UD |
1576 | #endif |
1577 | ||
d66e34cd RM |
1578 | /* Once we return, _dl_sysdep_start will invoke |
1579 | the DT_INIT functions and then *USER_ENTRY. */ | |
1580 | } | |
fd26970f UD |
1581 | \f |
1582 | /* This is a little helper function for resolving symbols while | |
1583 | tracing the binary. */ | |
1584 | static void | |
c84142e8 UD |
1585 | print_unresolved (int errcode __attribute__ ((unused)), const char *objname, |
1586 | const char *errstring) | |
fd26970f | 1587 | { |
3996f34b | 1588 | if (objname[0] == '\0') |
e6caf4e1 | 1589 | objname = rtld_progname ?: "<main program>"; |
35fc382a | 1590 | _dl_error_printf ("%s (%s)\n", errstring, objname); |
fd26970f | 1591 | } |
c84142e8 UD |
1592 | \f |
1593 | /* This is a little helper function for resolving symbols while | |
1594 | tracing the binary. */ | |
1595 | static void | |
1596 | print_missing_version (int errcode __attribute__ ((unused)), | |
1597 | const char *objname, const char *errstring) | |
1598 | { | |
e6caf4e1 | 1599 | _dl_error_printf ("%s: %s: %s\n", rtld_progname ?: "<program name unknown>", |
35fc382a | 1600 | objname, errstring); |
c84142e8 | 1601 | } |
ea278354 | 1602 | \f |
7dea968e UD |
1603 | /* Nonzero if any of the debugging options is enabled. */ |
1604 | static int any_debug; | |
1605 | ||
b5efde2f UD |
1606 | /* Process the string given as the parameter which explains which debugging |
1607 | options are enabled. */ | |
1608 | static void | |
14c44e2e | 1609 | process_dl_debug (const char *dl_debug) |
b5efde2f | 1610 | { |
3e2040c8 UD |
1611 | /* When adding new entries make sure that the maximal length of a name |
1612 | is correctly handled in the LD_DEBUG_HELP code below. */ | |
1613 | static const struct | |
1614 | { | |
379d4ec4 UD |
1615 | unsigned char len; |
1616 | const char name[10]; | |
3e2040c8 UD |
1617 | const char helptext[41]; |
1618 | unsigned short int mask; | |
1619 | } debopts[] = | |
1620 | { | |
379d4ec4 UD |
1621 | #define LEN_AND_STR(str) sizeof (str) - 1, str |
1622 | { LEN_AND_STR ("libs"), "display library search paths", | |
3e2040c8 | 1623 | DL_DEBUG_LIBS | DL_DEBUG_IMPCALLS }, |
379d4ec4 | 1624 | { LEN_AND_STR ("reloc"), "display relocation processing", |
3e2040c8 | 1625 | DL_DEBUG_RELOC | DL_DEBUG_IMPCALLS }, |
379d4ec4 | 1626 | { LEN_AND_STR ("files"), "display progress for input file", |
3e2040c8 | 1627 | DL_DEBUG_FILES | DL_DEBUG_IMPCALLS }, |
379d4ec4 | 1628 | { LEN_AND_STR ("symbols"), "display symbol table processing", |
3e2040c8 | 1629 | DL_DEBUG_SYMBOLS | DL_DEBUG_IMPCALLS }, |
379d4ec4 | 1630 | { LEN_AND_STR ("bindings"), "display information about symbol binding", |
3e2040c8 | 1631 | DL_DEBUG_BINDINGS | DL_DEBUG_IMPCALLS }, |
379d4ec4 | 1632 | { LEN_AND_STR ("versions"), "display version dependencies", |
3e2040c8 | 1633 | DL_DEBUG_VERSIONS | DL_DEBUG_IMPCALLS }, |
379d4ec4 | 1634 | { LEN_AND_STR ("all"), "all previous options combined", |
3e2040c8 UD |
1635 | DL_DEBUG_LIBS | DL_DEBUG_RELOC | DL_DEBUG_FILES | DL_DEBUG_SYMBOLS |
1636 | | DL_DEBUG_BINDINGS | DL_DEBUG_VERSIONS | DL_DEBUG_IMPCALLS }, | |
379d4ec4 | 1637 | { LEN_AND_STR ("statistics"), "display relocation statistics", |
3e2040c8 | 1638 | DL_DEBUG_STATISTICS }, |
379d4ec4 | 1639 | { LEN_AND_STR ("help"), "display this help message and exit", |
3e2040c8 UD |
1640 | DL_DEBUG_HELP }, |
1641 | }; | |
1642 | #define ndebopts (sizeof (debopts) / sizeof (debopts[0])) | |
3e2040c8 | 1643 | |
379d4ec4 UD |
1644 | /* Skip separating white spaces and commas. */ |
1645 | while (*dl_debug != '\0') | |
b5efde2f | 1646 | { |
379d4ec4 | 1647 | if (*dl_debug != ' ' && *dl_debug != ',' && *dl_debug != ':') |
b5efde2f | 1648 | { |
3e2040c8 | 1649 | size_t cnt; |
379d4ec4 | 1650 | size_t len = 1; |
77aba05b | 1651 | |
379d4ec4 UD |
1652 | while (dl_debug[len] != '\0' && dl_debug[len] != ' ' |
1653 | && dl_debug[len] != ',' && dl_debug[len] != ':') | |
1654 | ++len; | |
14c44e2e | 1655 | |
3e2040c8 | 1656 | for (cnt = 0; cnt < ndebopts; ++cnt) |
379d4ec4 UD |
1657 | if (debopts[cnt].len == len |
1658 | && memcmp (dl_debug, debopts[cnt].name, len) == 0) | |
3e2040c8 | 1659 | { |
d6b5d570 | 1660 | GL(dl_debug_mask) |= debopts[cnt].mask; |
5688da55 | 1661 | any_debug = 1; |
3e2040c8 UD |
1662 | break; |
1663 | } | |
77aba05b | 1664 | |
3e2040c8 UD |
1665 | if (cnt == ndebopts) |
1666 | { | |
1667 | /* Display a warning and skip everything until next | |
1668 | separator. */ | |
1669 | char *copy = strndupa (dl_debug, len); | |
1670 | _dl_error_printf ("\ | |
1671 | warning: debug option `%s' unknown; try LD_DEBUG=help\n", copy); | |
379d4ec4 UD |
1672 | } |
1673 | ||
1674 | dl_debug += len; | |
1675 | continue; | |
3e2040c8 | 1676 | } |
379d4ec4 UD |
1677 | |
1678 | ++dl_debug; | |
3e2040c8 | 1679 | } |
77aba05b | 1680 | |
d6b5d570 | 1681 | if (GL(dl_debug_mask) & DL_DEBUG_HELP) |
3e2040c8 UD |
1682 | { |
1683 | size_t cnt; | |
14c44e2e | 1684 | |
3e2040c8 UD |
1685 | _dl_printf ("\ |
1686 | Valid options for the LD_DEBUG environment variable are:\n\n"); | |
db276fa1 | 1687 | |
3e2040c8 | 1688 | for (cnt = 0; cnt < ndebopts; ++cnt) |
37d8b778 UD |
1689 | _dl_printf (" %.*s%s%s\n", debopts[cnt].len, debopts[cnt].name, |
1690 | " " + debopts[cnt].len - 3, | |
3e2040c8 | 1691 | debopts[cnt].helptext); |
14c44e2e | 1692 | |
3e2040c8 UD |
1693 | _dl_printf ("\n\ |
1694 | To direct the debugging output into a file instead of standard output\n\ | |
1695 | a filename can be specified using the LD_DEBUG_OUTPUT environment variable.\n"); | |
1696 | _exit (0); | |
b5efde2f | 1697 | } |
b5efde2f UD |
1698 | } |
1699 | \f | |
ea278354 UD |
1700 | /* Process all environments variables the dynamic linker must recognize. |
1701 | Since all of them start with `LD_' we are a bit smarter while finding | |
1702 | all the entries. */ | |
9360906d | 1703 | extern char **_environ attribute_hidden; |
67c94753 | 1704 | |
d6b5d570 | 1705 | |
ea278354 | 1706 | static void |
ba9fcb3f | 1707 | process_envvars (enum mode *modep) |
ea278354 | 1708 | { |
67c94753 | 1709 | char **runp = _environ; |
ea278354 UD |
1710 | char *envline; |
1711 | enum mode mode = normal; | |
7dea968e | 1712 | char *debug_output = NULL; |
ea278354 UD |
1713 | |
1714 | /* This is the default place for profiling data file. */ | |
e6caf4e1 UD |
1715 | GL(dl_profile_output) |
1716 | = &"/var/tmp\0/var/profile"[INTUSE(__libc_enable_secure) ? 9 : 0]; | |
ea278354 UD |
1717 | |
1718 | while ((envline = _dl_next_ld_env_entry (&runp)) != NULL) | |
1719 | { | |
379d4ec4 UD |
1720 | size_t len = 0; |
1721 | ||
1722 | while (envline[len] != '\0' && envline[len] != '=') | |
1723 | ++len; | |
ea278354 | 1724 | |
75e8d1f5 UD |
1725 | if (envline[len] != '=') |
1726 | /* This is a "LD_" variable at the end of the string without | |
1727 | a '=' character. Ignore it since otherwise we will access | |
1728 | invalid memory below. */ | |
67c94753 | 1729 | continue; |
75e8d1f5 | 1730 | |
67c94753 | 1731 | switch (len) |
ea278354 | 1732 | { |
14c44e2e UD |
1733 | case 4: |
1734 | /* Warning level, verbose or not. */ | |
67c94753 | 1735 | if (memcmp (envline, "WARN", 4) == 0) |
d6b5d570 | 1736 | GL(dl_verbose) = envline[5] != '\0'; |
14c44e2e | 1737 | break; |
ea278354 | 1738 | |
14c44e2e UD |
1739 | case 5: |
1740 | /* Debugging of the dynamic linker? */ | |
67c94753 UD |
1741 | if (memcmp (envline, "DEBUG", 5) == 0) |
1742 | process_dl_debug (&envline[6]); | |
14c44e2e | 1743 | break; |
b5efde2f | 1744 | |
14c44e2e UD |
1745 | case 7: |
1746 | /* Print information about versions. */ | |
67c94753 | 1747 | if (memcmp (envline, "VERBOSE", 7) == 0) |
14c44e2e | 1748 | { |
67c94753 | 1749 | version_info = envline[8] != '\0'; |
14c44e2e UD |
1750 | break; |
1751 | } | |
7dea968e | 1752 | |
14c44e2e | 1753 | /* List of objects to be preloaded. */ |
67c94753 | 1754 | if (memcmp (envline, "PRELOAD", 7) == 0) |
14c44e2e | 1755 | { |
67c94753 | 1756 | preloadlist = &envline[8]; |
14c44e2e UD |
1757 | break; |
1758 | } | |
120b4c49 | 1759 | |
14c44e2e | 1760 | /* Which shared object shall be profiled. */ |
c95f3fd4 | 1761 | if (memcmp (envline, "PROFILE", 7) == 0 && envline[8] != '\0') |
d6b5d570 | 1762 | GL(dl_profile) = &envline[8]; |
14c44e2e | 1763 | break; |
120b4c49 | 1764 | |
14c44e2e UD |
1765 | case 8: |
1766 | /* Do we bind early? */ | |
67c94753 | 1767 | if (memcmp (envline, "BIND_NOW", 8) == 0) |
f53c03c2 | 1768 | { |
5688da55 | 1769 | GL(dl_lazy) = envline[9] == '\0'; |
f53c03c2 UD |
1770 | break; |
1771 | } | |
67c94753 | 1772 | if (memcmp (envline, "BIND_NOT", 8) == 0) |
d6b5d570 | 1773 | GL(dl_bind_not) = envline[9] != '\0'; |
14c44e2e | 1774 | break; |
ea278354 | 1775 | |
14c44e2e UD |
1776 | case 9: |
1777 | /* Test whether we want to see the content of the auxiliary | |
1778 | array passed up from the kernel. */ | |
67c94753 | 1779 | if (memcmp (envline, "SHOW_AUXV", 9) == 0) |
14c44e2e UD |
1780 | _dl_show_auxv (); |
1781 | break; | |
ea278354 | 1782 | |
12264bd7 | 1783 | case 10: |
3081378b | 1784 | /* Mask for the important hardware capabilities. */ |
67c94753 | 1785 | if (memcmp (envline, "HWCAP_MASK", 10) == 0) |
d6b5d570 | 1786 | GL(dl_hwcap_mask) = __strtoul_internal (&envline[11], NULL, 0, 0); |
12264bd7 UD |
1787 | break; |
1788 | ||
f787edde UD |
1789 | case 11: |
1790 | /* Path where the binary is found. */ | |
e6caf4e1 | 1791 | if (!INTUSE(__libc_enable_secure) |
67c94753 | 1792 | && memcmp (envline, "ORIGIN_PATH", 11) == 0) |
d6b5d570 | 1793 | GL(dl_origin_path) = &envline[12]; |
f787edde UD |
1794 | break; |
1795 | ||
14c44e2e | 1796 | case 12: |
dec126b4 | 1797 | /* The library search path. */ |
67c94753 | 1798 | if (memcmp (envline, "LIBRARY_PATH", 12) == 0) |
dec126b4 | 1799 | { |
67c94753 | 1800 | library_path = &envline[13]; |
dec126b4 UD |
1801 | break; |
1802 | } | |
1803 | ||
14c44e2e | 1804 | /* Where to place the profiling data file. */ |
67c94753 | 1805 | if (memcmp (envline, "DEBUG_OUTPUT", 12) == 0) |
14c44e2e | 1806 | { |
67c94753 | 1807 | debug_output = &envline[13]; |
14c44e2e UD |
1808 | break; |
1809 | } | |
ea278354 | 1810 | |
67c94753 | 1811 | if (memcmp (envline, "DYNAMIC_WEAK", 12) == 0) |
5688da55 | 1812 | GL(dl_dynamic_weak) = 1; |
14c44e2e | 1813 | break; |
ea278354 | 1814 | |
14c44e2e UD |
1815 | case 14: |
1816 | /* Where to place the profiling data file. */ | |
e6caf4e1 | 1817 | if (!INTUSE(__libc_enable_secure) |
3e2040c8 UD |
1818 | && memcmp (envline, "PROFILE_OUTPUT", 14) == 0 |
1819 | && envline[15] != '\0') | |
d6b5d570 | 1820 | GL(dl_profile_output) = &envline[15]; |
14c44e2e | 1821 | break; |
120b4c49 | 1822 | |
32e6df36 UD |
1823 | case 16: |
1824 | /* The mode of the dynamic linker can be set. */ | |
1825 | if (memcmp (envline, "TRACE_PRELINKING", 16) == 0) | |
1826 | { | |
1827 | mode = trace; | |
d6b5d570 UD |
1828 | GL(dl_verbose) = 1; |
1829 | GL(dl_debug_mask) |= DL_DEBUG_PRELINK; | |
1830 | GL(dl_trace_prelink) = &envline[17]; | |
32e6df36 UD |
1831 | } |
1832 | break; | |
1833 | ||
14c44e2e UD |
1834 | case 20: |
1835 | /* The mode of the dynamic linker can be set. */ | |
67c94753 | 1836 | if (memcmp (envline, "TRACE_LOADED_OBJECTS", 20) == 0) |
14c44e2e UD |
1837 | mode = trace; |
1838 | break; | |
e2102c14 UD |
1839 | |
1840 | /* We might have some extra environment variable to handle. This | |
1841 | is tricky due to the pre-processing of the length of the name | |
1842 | in the switch statement here. The code here assumes that added | |
1843 | environment variables have a different length. */ | |
1844 | #ifdef EXTRA_LD_ENVVARS | |
1845 | EXTRA_LD_ENVVARS | |
1846 | #endif | |
ea278354 UD |
1847 | } |
1848 | } | |
1849 | ||
3e2040c8 UD |
1850 | /* The caller wants this information. */ |
1851 | *modep = mode; | |
1852 | ||
4bae5567 UD |
1853 | /* Extra security for SUID binaries. Remove all dangerous environment |
1854 | variables. */ | |
e6caf4e1 | 1855 | if (__builtin_expect (INTUSE(__libc_enable_secure), 0)) |
4bae5567 | 1856 | { |
c95f3fd4 | 1857 | static const char unsecure_envvars[] = |
4bae5567 UD |
1858 | #ifdef EXTRA_UNSECURE_ENVVARS |
1859 | EXTRA_UNSECURE_ENVVARS | |
1860 | #endif | |
c95f3fd4 UD |
1861 | UNSECURE_ENVVARS; |
1862 | const char *nextp; | |
1863 | ||
1864 | nextp = unsecure_envvars; | |
1865 | do | |
1866 | { | |
1867 | unsetenv (nextp); | |
9710f75d UD |
1868 | /* We could use rawmemchr but this need not be fast. */ |
1869 | nextp = (char *) (strchr) (nextp, '\0') + 1; | |
c95f3fd4 UD |
1870 | } |
1871 | while (*nextp != '\0'); | |
74955460 UD |
1872 | |
1873 | if (__access ("/etc/suid-debug", F_OK) != 0) | |
1874 | unsetenv ("MALLOC_CHECK_"); | |
4bae5567 | 1875 | } |
7dea968e UD |
1876 | /* If we have to run the dynamic linker in debugging mode and the |
1877 | LD_DEBUG_OUTPUT environment variable is given, we write the debug | |
1878 | messages to this file. */ | |
3e2040c8 | 1879 | else if (any_debug && debug_output != NULL) |
7dea968e | 1880 | { |
5f2de337 UD |
1881 | #ifdef O_NOFOLLOW |
1882 | const int flags = O_WRONLY | O_APPEND | O_CREAT | O_NOFOLLOW; | |
1883 | #else | |
1884 | const int flags = O_WRONLY | O_APPEND | O_CREAT; | |
1885 | #endif | |
7a2fd787 UD |
1886 | size_t name_len = strlen (debug_output); |
1887 | char buf[name_len + 12]; | |
1888 | char *startp; | |
1889 | ||
1890 | buf[name_len + 11] = '\0'; | |
9710f75d | 1891 | startp = _itoa (__getpid (), &buf[name_len + 11], 10, 0); |
7a2fd787 UD |
1892 | *--startp = '.'; |
1893 | startp = memcpy (startp - name_len, debug_output, name_len); | |
1894 | ||
5688da55 UD |
1895 | GL(dl_debug_fd) = __open (startp, flags, DEFFILEMODE); |
1896 | if (GL(dl_debug_fd) == -1) | |
7dea968e | 1897 | /* We use standard output if opening the file failed. */ |
5688da55 | 1898 | GL(dl_debug_fd) = STDOUT_FILENO; |
7dea968e | 1899 | } |
ea278354 | 1900 | } |
db276fa1 UD |
1901 | |
1902 | ||
1903 | /* Print the various times we collected. */ | |
1904 | static void | |
1905 | print_statistics (void) | |
1906 | { | |
8b07d6a8 | 1907 | #ifndef HP_TIMING_NONAVAIL |
f457369d | 1908 | char buf[200]; |
db276fa1 UD |
1909 | char *cp; |
1910 | char *wp; | |
1911 | ||
1912 | /* Total time rtld used. */ | |
1913 | if (HP_TIMING_AVAIL) | |
1914 | { | |
1915 | HP_TIMING_PRINT (buf, sizeof (buf), rtld_total_time); | |
cff26a3e AJ |
1916 | INTUSE(_dl_debug_printf) ("\nruntime linker statistics:\n" |
1917 | " total startup time in dynamic loader: %s\n", | |
1918 | buf); | |
db276fa1 UD |
1919 | } |
1920 | ||
1921 | /* Print relocation statistics. */ | |
1922 | if (HP_TIMING_AVAIL) | |
1923 | { | |
35fc382a | 1924 | char pbuf[30]; |
db276fa1 | 1925 | HP_TIMING_PRINT (buf, sizeof (buf), relocate_time); |
9710f75d UD |
1926 | cp = _itoa ((1000ULL * relocate_time) / rtld_total_time, |
1927 | pbuf + sizeof (pbuf), 10, 0); | |
35fc382a UD |
1928 | wp = pbuf; |
1929 | switch (pbuf + sizeof (pbuf) - cp) | |
db276fa1 UD |
1930 | { |
1931 | case 3: | |
1932 | *wp++ = *cp++; | |
1933 | case 2: | |
1934 | *wp++ = *cp++; | |
1935 | case 1: | |
1936 | *wp++ = '.'; | |
1937 | *wp++ = *cp++; | |
1938 | } | |
1939 | *wp = '\0'; | |
cff26a3e | 1940 | INTUSE(_dl_debug_printf) ("\ |
7969407a | 1941 | time needed for relocation: %s (%s%%)\n", |
cff26a3e | 1942 | buf, pbuf); |
db276fa1 | 1943 | } |
1531e094 | 1944 | #endif |
cff26a3e AJ |
1945 | INTUSE(_dl_debug_printf) (" number of relocations: %lu\n", |
1946 | GL(dl_num_relocations)); | |
1947 | INTUSE(_dl_debug_printf) (" number of relocations from cache: %lu\n", | |
1948 | GL(dl_num_cache_relocations)); | |
db276fa1 | 1949 | |
1531e094 | 1950 | #ifndef HP_TIMING_NONAVAIL |
db276fa1 UD |
1951 | /* Time spend while loading the object and the dependencies. */ |
1952 | if (HP_TIMING_AVAIL) | |
1953 | { | |
35fc382a | 1954 | char pbuf[30]; |
db276fa1 | 1955 | HP_TIMING_PRINT (buf, sizeof (buf), load_time); |
9710f75d UD |
1956 | cp = _itoa ((1000ULL * load_time) / rtld_total_time, |
1957 | pbuf + sizeof (pbuf), 10, 0); | |
35fc382a UD |
1958 | wp = pbuf; |
1959 | switch (pbuf + sizeof (pbuf) - cp) | |
db276fa1 UD |
1960 | { |
1961 | case 3: | |
1962 | *wp++ = *cp++; | |
1963 | case 2: | |
1964 | *wp++ = *cp++; | |
1965 | case 1: | |
1966 | *wp++ = '.'; | |
1967 | *wp++ = *cp++; | |
1968 | } | |
1969 | *wp = '\0'; | |
cff26a3e | 1970 | INTUSE(_dl_debug_printf) ("\ |
7969407a | 1971 | time needed to load objects: %s (%s%%)\n", |
cff26a3e | 1972 | buf, pbuf); |
db276fa1 | 1973 | } |
1531e094 | 1974 | #endif |
db276fa1 | 1975 | } |