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d66e34cd | 1 | /* Run time dynamic linker. |
ed20b3d9 | 2 | Copyright (C) 1995-2002, 2003, 2004 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> |
154d10bd | 21 | #include <dlfcn.h> |
7dea968e | 22 | #include <fcntl.h> |
164a7164 | 23 | #include <stdbool.h> |
d66e34cd | 24 | #include <stdlib.h> |
f51d1dfd | 25 | #include <string.h> |
d66e34cd | 26 | #include <unistd.h> |
2064087b | 27 | #include <sys/mman.h> /* Check if MAP_ANON is defined. */ |
af8bf6bd | 28 | #include <sys/param.h> |
ba9fcb3f | 29 | #include <sys/stat.h> |
a42195db | 30 | #include <ldsodefs.h> |
ce37fa88 | 31 | #include <stdio-common/_itoa.h> |
f21acc89 | 32 | #include <entry.h> |
c94a8080 | 33 | #include <fpu_control.h> |
db276fa1 | 34 | #include <hp-timing.h> |
cf197e41 | 35 | #include <bits/libc-lock.h> |
f5348425 | 36 | #include "dynamic-link.h" |
e2102c14 | 37 | #include "dl-librecon.h" |
74955460 | 38 | #include <unsecvars.h> |
5688da55 UD |
39 | #include <dl-cache.h> |
40 | #include <dl-procinfo.h> | |
5f5843e3 | 41 | #include <tls.h> |
f5348425 | 42 | |
a853022c | 43 | #include <assert.h> |
f5348425 | 44 | |
6ce3881d RM |
45 | /* Avoid PLT use for our local calls at startup. */ |
46 | extern __typeof (__mempcpy) __mempcpy attribute_hidden; | |
47 | ||
48 | /* GCC has mental blocks about _exit. */ | |
49 | extern __typeof (_exit) exit_internal asm ("_exit") attribute_hidden; | |
50 | #define _exit exit_internal | |
51 | ||
fd26970f | 52 | /* Helper function to handle errors while resolving symbols. */ |
c84142e8 UD |
53 | static void print_unresolved (int errcode, const char *objname, |
54 | const char *errsting); | |
55 | ||
56 | /* Helper function to handle errors when a version is missing. */ | |
57 | static void print_missing_version (int errcode, const char *objname, | |
58 | const char *errsting); | |
fd26970f | 59 | |
db276fa1 | 60 | /* Print the various times we collected. */ |
392a6b52 | 61 | static void print_statistics (hp_timing_t *total_timep); |
ea278354 UD |
62 | |
63 | /* This is a list of all the modes the dynamic loader can be in. */ | |
64 | enum mode { normal, list, verify, trace }; | |
65 | ||
66 | /* Process all environments variables the dynamic linker must recognize. | |
67 | Since all of them start with `LD_' we are a bit smarter while finding | |
68 | all the entries. */ | |
ba9fcb3f | 69 | static void process_envvars (enum mode *modep); |
ea278354 | 70 | |
392a6b52 | 71 | int _dl_argc attribute_relro attribute_hidden; |
11986c68 UD |
72 | #ifdef DL_ARGV_NOT_RELRO |
73 | char **_dl_argv = NULL; | |
74 | #else | |
697afbe1 | 75 | char **_dl_argv attribute_relro = NULL; |
11986c68 | 76 | #endif |
e6caf4e1 | 77 | INTDEF(_dl_argv) |
5c82e15e UD |
78 | |
79 | /* Nonzero if we were run directly. */ | |
392a6b52 | 80 | unsigned int _dl_skip_args attribute_relro attribute_hidden; |
cf197e41 | 81 | |
39778c6c UD |
82 | /* Set nonzero during loading and initialization of executable and |
83 | libraries, cleared before the executable's entry point runs. This | |
84 | must not be initialized to nonzero, because the unused dynamic | |
85 | linker loaded in for libc.so's "ld.so.1" dep will provide the | |
86 | definition seen by libc.so's initializer; that value must be zero, | |
87 | and will be since that dynamic linker's _dl_start and dl_main will | |
88 | never be called. */ | |
e6caf4e1 UD |
89 | int _dl_starting_up = 0; |
90 | INTVARDEF(_dl_starting_up) | |
39778c6c | 91 | |
d6b5d570 UD |
92 | /* This is the structure which defines all variables global to ld.so |
93 | (except those which cannot be added for some reason). */ | |
5688da55 UD |
94 | struct rtld_global _rtld_global = |
95 | { | |
ccdf0cab UD |
96 | /* Get architecture specific initializer. */ |
97 | #include <dl-procinfo.c> | |
ecdeaac0 RM |
98 | /* Default presumption without further information is executable stack. */ |
99 | ._dl_stack_flags = PF_R|PF_W|PF_X, | |
ffa8d2a0 | 100 | #ifdef _LIBC_REENTRANT |
d3c9f895 | 101 | ._dl_load_lock = _RTLD_LOCK_RECURSIVE_INITIALIZER |
ffa8d2a0 | 102 | #endif |
5688da55 | 103 | }; |
27a754a9 UD |
104 | /* If we would use strong_alias here the compiler would see a |
105 | non-hidden definition. This would undo the effect of the previous | |
106 | declaration. So spell out was strong_alias does plus add the | |
107 | visibility attribute. */ | |
108 | extern struct rtld_global _rtld_local | |
109 | __attribute__ ((alias ("_rtld_global"), visibility ("hidden"))); | |
c0fb8a56 | 110 | |
afdca0f2 UD |
111 | |
112 | /* This variable is similar to _rtld_local, but all values are | |
113 | read-only after relocation. */ | |
114 | struct rtld_global_ro _rtld_global_ro attribute_relro = | |
115 | { | |
116 | #ifdef NEED_DL_SYSINFO | |
117 | ._dl_sysinfo = DL_SYSINFO_DEFAULT, | |
118 | #endif | |
dd70526e | 119 | ._dl_debug_fd = STDERR_FILENO, |
afdca0f2 UD |
120 | ._dl_use_load_bias = -2, |
121 | ._dl_correct_cache_id = _DL_CACHE_DEFAULT_ID, | |
122 | ._dl_hwcap_mask = HWCAP_IMPORTANT, | |
123 | ._dl_lazy = 1, | |
124 | ._dl_fpu_control = _FPU_DEFAULT, | |
154d10bd UD |
125 | |
126 | /* Function pointers. */ | |
127 | ._dl_get_origin = _dl_get_origin, | |
128 | ._dl_dst_count = _dl_dst_count, | |
129 | ._dl_dst_substitute = _dl_dst_substitute, | |
130 | ._dl_map_object = _dl_map_object, | |
131 | ._dl_map_object_deps = _dl_map_object_deps, | |
132 | ._dl_relocate_object = _dl_relocate_object, | |
133 | ._dl_check_map_versions = _dl_check_map_versions, | |
134 | ._dl_init = _dl_init, | |
135 | ._dl_debug_state = _dl_debug_state, | |
136 | ._dl_unload_cache = _dl_unload_cache, | |
137 | ._dl_debug_printf = _dl_debug_printf, | |
138 | ._dl_catch_error = _dl_catch_error, | |
139 | ._dl_signal_error = _dl_signal_error, | |
140 | ._dl_start_profile = _dl_start_profile, | |
141 | ._dl_mcount = _dl_mcount_internal, | |
142 | ._dl_lookup_symbol = _dl_lookup_symbol, | |
143 | ._dl_lookup_versioned_symbol = _dl_lookup_versioned_symbol, | |
144 | ._dl_lookup_symbol_skip = _dl_lookup_symbol_skip, | |
145 | ._dl_lookup_versioned_symbol_skip = _dl_lookup_versioned_symbol_skip, | |
afdca0f2 UD |
146 | }; |
147 | /* If we would use strong_alias here the compiler would see a | |
148 | non-hidden definition. This would undo the effect of the previous | |
149 | declaration. So spell out was strong_alias does plus add the | |
150 | visibility attribute. */ | |
151 | extern struct rtld_global_ro _rtld_local_ro | |
152 | __attribute__ ((alias ("_rtld_global_ro"), visibility ("hidden"))); | |
153 | ||
154 | ||
67ddea92 | 155 | static void dl_main (const ElfW(Phdr) *phdr, ElfW(Word) phnum, |
266180eb | 156 | ElfW(Addr) *user_entry); |
d66e34cd | 157 | |
392a6b52 | 158 | /* These two variables cannot be moved into .data.rel.ro. */ |
d6b5d570 UD |
159 | static struct libname_list _dl_rtld_libname; |
160 | static struct libname_list _dl_rtld_libname2; | |
86d2c878 | 161 | |
eaad82e0 UD |
162 | /* We expect less than a second for relocation. */ |
163 | #ifdef HP_SMALL_TIMING_AVAIL | |
164 | # undef HP_TIMING_AVAIL | |
165 | # define HP_TIMING_AVAIL HP_SMALL_TIMING_AVAIL | |
166 | #endif | |
167 | ||
db276fa1 | 168 | /* Variable for statistics. */ |
5732c4df | 169 | #ifndef HP_TIMING_NONAVAIL |
db276fa1 | 170 | static hp_timing_t relocate_time; |
392a6b52 UD |
171 | static hp_timing_t load_time attribute_relro; |
172 | static hp_timing_t start_time attribute_relro; | |
5732c4df | 173 | #endif |
db276fa1 | 174 | |
2a76f7ef UD |
175 | /* Additional definitions needed by TLS initialization. */ |
176 | #ifdef TLS_INIT_HELPER | |
177 | TLS_INIT_HELPER | |
5e289179 UD |
178 | #endif |
179 | ||
180 | /* Helper function for syscall implementation. */ | |
181 | #ifdef DL_SYSINFO_IMPLEMENTATION | |
182 | DL_SYSINFO_IMPLEMENTATION | |
2a76f7ef UD |
183 | #endif |
184 | ||
01d8e36d UD |
185 | /* Before ld.so is relocated we must not access variables which need |
186 | relocations. This means variables which are exported. Variables | |
187 | declared as static are fine. If we can mark a variable hidden this | |
27a754a9 | 188 | is fine, too. The latter is important here. We can avoid setting |
01d8e36d UD |
189 | up a temporary link map for ld.so if we can mark _rtld_global as |
190 | hidden. */ | |
9df89390 UD |
191 | #if defined PI_STATIC_AND_HIDDEN && defined HAVE_HIDDEN \ |
192 | && defined HAVE_VISIBILITY_ATTRIBUTE | |
01d8e36d UD |
193 | # define DONT_USE_BOOTSTRAP_MAP 1 |
194 | #endif | |
195 | ||
196 | #ifdef DONT_USE_BOOTSTRAP_MAP | |
197 | static ElfW(Addr) _dl_start_final (void *arg); | |
198 | #else | |
4874b009 RM |
199 | struct dl_start_final_info |
200 | { | |
201 | struct link_map l; | |
202 | #if !defined HP_TIMING_NONAVAIL && HP_TIMING_INLINE | |
203 | hp_timing_t start_time; | |
204 | #endif | |
205 | }; | |
01d8e36d | 206 | static ElfW(Addr) _dl_start_final (void *arg, |
4874b009 | 207 | struct dl_start_final_info *info); |
01d8e36d | 208 | #endif |
6a1db4ff | 209 | |
65da9563 RM |
210 | /* These defined magically in the linker script. */ |
211 | extern char _begin[] attribute_hidden; | |
212 | extern char _end[] attribute_hidden; | |
213 | ||
214 | ||
b1dbbaa4 RM |
215 | #ifdef RTLD_START |
216 | RTLD_START | |
217 | #else | |
eaad82e0 | 218 | # error "sysdeps/MACHINE/dl-machine.h fails to define RTLD_START" |
b1dbbaa4 RM |
219 | #endif |
220 | ||
c2248c44 RM |
221 | #ifndef VALIDX |
222 | # define VALIDX(tag) (DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGNUM \ | |
223 | + DT_EXTRANUM + DT_VALTAGIDX (tag)) | |
224 | #endif | |
225 | #ifndef ADDRIDX | |
226 | # define ADDRIDX(tag) (DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGNUM \ | |
227 | + DT_EXTRANUM + DT_VALNUM + DT_ADDRTAGIDX (tag)) | |
228 | #endif | |
229 | ||
230 | /* This is the second half of _dl_start (below). It can be inlined safely | |
231 | under DONT_USE_BOOTSTRAP_MAP, where it is careful not to make any GOT | |
232 | references. When the tools don't permit us to avoid using a GOT entry | |
233 | for _dl_rtld_global (no attribute_hidden support), we must make sure | |
234 | this function is not inlined (see below). */ | |
235 | ||
236 | #ifdef DONT_USE_BOOTSTRAP_MAP | |
237 | static inline ElfW(Addr) __attribute__ ((always_inline)) | |
238 | _dl_start_final (void *arg) | |
239 | #else | |
240 | static ElfW(Addr) __attribute__ ((noinline)) | |
4874b009 | 241 | _dl_start_final (void *arg, struct dl_start_final_info *info) |
c2248c44 RM |
242 | #endif |
243 | { | |
244 | ElfW(Addr) start_addr; | |
c2248c44 RM |
245 | |
246 | if (HP_TIMING_AVAIL) | |
247 | { | |
248 | /* If it hasn't happen yet record the startup time. */ | |
249 | if (! HP_TIMING_INLINE) | |
250 | HP_TIMING_NOW (start_time); | |
735d67f2 | 251 | #if !defined DONT_USE_BOOTSTRAP_MAP && !defined HP_TIMING_NONAVAIL |
4874b009 RM |
252 | else |
253 | start_time = info->start_time; | |
254 | #endif | |
c2248c44 RM |
255 | |
256 | /* Initialize the timing functions. */ | |
257 | HP_TIMING_DIFF_INIT (); | |
258 | } | |
259 | ||
260 | /* Transfer data about ourselves to the permanent link_map structure. */ | |
261 | #ifndef DONT_USE_BOOTSTRAP_MAP | |
4874b009 RM |
262 | GL(dl_rtld_map).l_addr = info->l.l_addr; |
263 | GL(dl_rtld_map).l_ld = info->l.l_ld; | |
264 | memcpy (GL(dl_rtld_map).l_info, info->l.l_info, | |
c2248c44 | 265 | sizeof GL(dl_rtld_map).l_info); |
4874b009 | 266 | GL(dl_rtld_map).l_mach = info->l.l_mach; |
c2248c44 RM |
267 | #endif |
268 | _dl_setup_hash (&GL(dl_rtld_map)); | |
269 | GL(dl_rtld_map).l_opencount = 1; | |
270 | GL(dl_rtld_map).l_map_start = (ElfW(Addr)) _begin; | |
271 | GL(dl_rtld_map).l_map_end = (ElfW(Addr)) _end; | |
272 | /* Copy the TLS related data if necessary. */ | |
273 | #if USE_TLS && !defined DONT_USE_BOOTSTRAP_MAP | |
ce460d04 | 274 | # if USE___THREAD |
4874b009 | 275 | assert (info->l.l_tls_modid != 0); |
ce460d04 RM |
276 | GL(dl_rtld_map).l_tls_blocksize = info->l.l_tls_blocksize; |
277 | GL(dl_rtld_map).l_tls_align = info->l.l_tls_align; | |
99fe3b0e | 278 | GL(dl_rtld_map).l_tls_firstbyte_offset = info->l.l_tls_firstbyte_offset; |
ce460d04 RM |
279 | GL(dl_rtld_map).l_tls_initimage_size = info->l.l_tls_initimage_size; |
280 | GL(dl_rtld_map).l_tls_initimage = info->l.l_tls_initimage; | |
281 | GL(dl_rtld_map).l_tls_offset = info->l.l_tls_offset; | |
282 | GL(dl_rtld_map).l_tls_modid = 1; | |
c2248c44 | 283 | # else |
ce460d04 | 284 | assert (info->l.l_tls_modid == 0); |
299601a1 UD |
285 | # if NO_TLS_OFFSET != 0 |
286 | GL(dl_rtld_map).l_tls_offset = NO_TLS_OFFSET; | |
287 | # endif | |
c2248c44 | 288 | # endif |
ce460d04 | 289 | |
c2248c44 RM |
290 | #endif |
291 | ||
292 | #if HP_TIMING_AVAIL | |
293 | HP_TIMING_NOW (GL(dl_cpuclock_offset)); | |
294 | #endif | |
295 | ||
ea4f25a7 UD |
296 | /* Initialize the stack end variable. */ |
297 | __libc_stack_end = __builtin_frame_address (0); | |
298 | ||
c2248c44 RM |
299 | /* Call the OS-dependent function to set up life so we can do things like |
300 | file access. It will call `dl_main' (below) to do all the real work | |
301 | of the dynamic linker, and then unwind our frame and run the user | |
302 | entry point on the same stack we entered on. */ | |
ecdeaac0 | 303 | start_addr = _dl_sysdep_start (arg, &dl_main); |
c2248c44 RM |
304 | |
305 | #ifndef HP_TIMING_NONAVAIL | |
392a6b52 | 306 | hp_timing_t rtld_total_time; |
c2248c44 RM |
307 | if (HP_TIMING_AVAIL) |
308 | { | |
309 | hp_timing_t end_time; | |
310 | ||
311 | /* Get the current time. */ | |
312 | HP_TIMING_NOW (end_time); | |
313 | ||
314 | /* Compute the difference. */ | |
315 | HP_TIMING_DIFF (rtld_total_time, start_time, end_time); | |
316 | } | |
317 | #endif | |
318 | ||
afdca0f2 | 319 | if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_STATISTICS, 0)) |
39b04aa3 UD |
320 | { |
321 | #ifndef HP_TIMING_NONAVAIL | |
322 | print_statistics (&rtld_total_time); | |
323 | #else | |
324 | print_statistics (NULL); | |
325 | #endif | |
326 | } | |
c2248c44 RM |
327 | |
328 | return start_addr; | |
329 | } | |
330 | ||
50746436 | 331 | static ElfW(Addr) __attribute_used__ internal_function |
d66e34cd RM |
332 | _dl_start (void *arg) |
333 | { | |
01d8e36d UD |
334 | #ifdef DONT_USE_BOOTSTRAP_MAP |
335 | # define bootstrap_map GL(dl_rtld_map) | |
336 | #else | |
4874b009 RM |
337 | struct dl_start_final_info info; |
338 | # define bootstrap_map info.l | |
739d440d | 339 | #endif |
d66e34cd | 340 | |
b1dbbaa4 RM |
341 | /* This #define produces dynamic linking inline functions for |
342 | bootstrap relocation instead of general-purpose relocation. */ | |
343 | #define RTLD_BOOTSTRAP | |
c0282c06 UD |
344 | #define RESOLVE_MAP(sym, version, flags) \ |
345 | ((*(sym))->st_shndx == SHN_UNDEF ? 0 : &bootstrap_map) | |
50463d27 UD |
346 | #define RESOLVE(sym, version, flags) \ |
347 | ((*(sym))->st_shndx == SHN_UNDEF ? 0 : bootstrap_map.l_addr) | |
b1dbbaa4 RM |
348 | #include "dynamic-link.h" |
349 | ||
db276fa1 | 350 | if (HP_TIMING_INLINE && HP_TIMING_AVAIL) |
4874b009 | 351 | #ifdef DONT_USE_BOOTSTRAP_MAP |
db276fa1 | 352 | HP_TIMING_NOW (start_time); |
4874b009 RM |
353 | #else |
354 | HP_TIMING_NOW (info.start_time); | |
355 | #endif | |
db276fa1 | 356 | |
e66d0a4c UD |
357 | /* Partly clean the `bootstrap_map' structure up. Don't use |
358 | `memset' since it might not be built in or inlined and we cannot | |
359 | make function calls at this point. Use '__builtin_memset' if we | |
01d8e36d UD |
360 | know it is available. We do not have to clear the memory if we |
361 | do not have to use the temporary bootstrap_map. Global variables | |
362 | are initialized to zero by default. */ | |
363 | #ifndef DONT_USE_BOOTSTRAP_MAP | |
364 | # ifdef HAVE_BUILTIN_MEMSET | |
e66d0a4c | 365 | __builtin_memset (bootstrap_map.l_info, '\0', sizeof (bootstrap_map.l_info)); |
01d8e36d | 366 | # else |
ce460d04 | 367 | for (size_t cnt = 0; |
264ec183 UD |
368 | cnt < sizeof (bootstrap_map.l_info) / sizeof (bootstrap_map.l_info[0]); |
369 | ++cnt) | |
370 | bootstrap_map.l_info[cnt] = 0; | |
01d8e36d | 371 | # endif |
e66d0a4c | 372 | #endif |
264ec183 | 373 | |
d66e34cd | 374 | /* Figure out the run-time load address of the dynamic linker itself. */ |
86d2c878 | 375 | bootstrap_map.l_addr = elf_machine_load_address (); |
d66e34cd | 376 | |
47707456 UD |
377 | /* Read our own dynamic section and fill in the info array. */ |
378 | bootstrap_map.l_ld = (void *) bootstrap_map.l_addr + elf_machine_dynamic (); | |
479aa8ec | 379 | elf_get_dynamic_info (&bootstrap_map, NULL); |
d66e34cd | 380 | |
299601a1 UD |
381 | #if defined USE_TLS && NO_TLS_OFFSET != 0 |
382 | bootstrap_map.l_tls_offset = NO_TLS_OFFSET; | |
383 | #endif | |
384 | ||
65da9563 RM |
385 | /* Get the dynamic linker's own program header. First we need the ELF |
386 | file header. The `_begin' symbol created by the linker script points | |
387 | to it. When we have something like GOTOFF relocs, we can use a plain | |
388 | reference to find the runtime address. Without that, we have to rely | |
389 | on the `l_addr' value, which is not the value we want when prelinked. */ | |
ed20b3d9 | 390 | #if USE___THREAD |
5f5843e3 | 391 | dtv_t initdtv[3]; |
ce460d04 RM |
392 | ElfW(Ehdr) *ehdr |
393 | # ifdef DONT_USE_BOOTSTRAP_MAP | |
394 | = (ElfW(Ehdr) *) &_begin; | |
395 | # else | |
e8ed861d | 396 | # error This will not work with prelink. |
ce460d04 RM |
397 | = (ElfW(Ehdr) *) bootstrap_map.l_addr; |
398 | # endif | |
399 | ElfW(Phdr) *phdr = (ElfW(Phdr) *) ((void *) ehdr + ehdr->e_phoff); | |
400 | size_t cnt = ehdr->e_phnum; /* PT_TLS is usually the last phdr. */ | |
401 | while (cnt-- > 0) | |
739d440d UD |
402 | if (phdr[cnt].p_type == PT_TLS) |
403 | { | |
404 | void *tlsblock; | |
405 | size_t max_align = MAX (TLS_INIT_TCB_ALIGN, phdr[cnt].p_align); | |
f884de5b | 406 | char *p; |
739d440d UD |
407 | |
408 | bootstrap_map.l_tls_blocksize = phdr[cnt].p_memsz; | |
409 | bootstrap_map.l_tls_align = phdr[cnt].p_align; | |
99fe3b0e UD |
410 | if (phdr[cnt].p_align == 0) |
411 | bootstrap_map.l_tls_firstbyte_offset = 0; | |
412 | else | |
413 | bootstrap_map.l_tls_firstbyte_offset = (phdr[cnt].p_vaddr | |
414 | & (phdr[cnt].p_align - 1)); | |
739d440d UD |
415 | assert (bootstrap_map.l_tls_blocksize != 0); |
416 | bootstrap_map.l_tls_initimage_size = phdr[cnt].p_filesz; | |
417 | bootstrap_map.l_tls_initimage = (void *) (bootstrap_map.l_addr | |
a816b435 | 418 | + phdr[cnt].p_vaddr); |
739d440d UD |
419 | |
420 | /* We can now allocate the initial TLS block. This can happen | |
421 | on the stack. We'll get the final memory later when we | |
422 | know all about the various objects loaded at startup | |
423 | time. */ | |
424 | # if TLS_TCB_AT_TP | |
425 | tlsblock = alloca (roundup (bootstrap_map.l_tls_blocksize, | |
426 | TLS_INIT_TCB_ALIGN) | |
427 | + TLS_INIT_TCB_SIZE | |
428 | + max_align); | |
429 | # elif TLS_DTV_AT_TP | |
430 | tlsblock = alloca (roundup (TLS_INIT_TCB_SIZE, | |
431 | bootstrap_map.l_tls_align) | |
432 | + bootstrap_map.l_tls_blocksize | |
433 | + max_align); | |
434 | # else | |
435 | /* In case a model with a different layout for the TCB and DTV | |
436 | is defined add another #elif here and in the following #ifs. */ | |
437 | # error "Either TLS_TCB_AT_TP or TLS_DTV_AT_TP must be defined" | |
438 | # endif | |
439 | /* Align the TLS block. */ | |
440 | tlsblock = (void *) (((uintptr_t) tlsblock + max_align - 1) | |
441 | & ~(max_align - 1)); | |
442 | ||
443 | /* Initialize the dtv. [0] is the length, [1] the generation | |
444 | counter. */ | |
445 | initdtv[0].counter = 1; | |
446 | initdtv[1].counter = 0; | |
447 | ||
448 | /* Initialize the TLS block. */ | |
449 | # if TLS_TCB_AT_TP | |
450 | initdtv[2].pointer = tlsblock; | |
451 | # elif TLS_DTV_AT_TP | |
452 | bootstrap_map.l_tls_offset = roundup (TLS_INIT_TCB_SIZE, | |
453 | bootstrap_map.l_tls_align); | |
454 | initdtv[2].pointer = (char *) tlsblock + bootstrap_map.l_tls_offset; | |
455 | # else | |
456 | # error "Either TLS_TCB_AT_TP or TLS_DTV_AT_TP must be defined" | |
457 | # endif | |
f884de5b UD |
458 | p = __mempcpy (initdtv[2].pointer, bootstrap_map.l_tls_initimage, |
459 | bootstrap_map.l_tls_initimage_size); | |
460 | # ifdef HAVE_BUILTIN_MEMSET | |
461 | __builtin_memset (p, '\0', (bootstrap_map.l_tls_blocksize | |
462 | - bootstrap_map.l_tls_initimage_size)); | |
463 | # else | |
464 | { | |
465 | size_t remaining = (bootstrap_map.l_tls_blocksize | |
466 | - bootstrap_map.l_tls_initimage_size); | |
467 | while (remaining-- > 0) | |
468 | *p++ = '\0'; | |
469 | } | |
470 | #endif | |
739d440d UD |
471 | |
472 | /* Install the pointer to the dtv. */ | |
473 | ||
474 | /* Initialize the thread pointer. */ | |
475 | # if TLS_TCB_AT_TP | |
476 | bootstrap_map.l_tls_offset | |
477 | = roundup (bootstrap_map.l_tls_blocksize, TLS_INIT_TCB_ALIGN); | |
478 | ||
479 | INSTALL_DTV ((char *) tlsblock + bootstrap_map.l_tls_offset, | |
480 | initdtv); | |
481 | ||
fde89ad0 RM |
482 | const char *lossage = TLS_INIT_TP ((char *) tlsblock |
483 | + bootstrap_map.l_tls_offset, 0); | |
739d440d UD |
484 | # elif TLS_DTV_AT_TP |
485 | INSTALL_DTV (tlsblock, initdtv); | |
fde89ad0 | 486 | const char *lossage = TLS_INIT_TP (tlsblock, 0); |
739d440d UD |
487 | # else |
488 | # error "Either TLS_TCB_AT_TP or TLS_DTV_AT_TP must be defined" | |
489 | # endif | |
fde89ad0 RM |
490 | if (__builtin_expect (lossage != NULL, 0)) |
491 | _dl_fatal_printf ("cannot set up thread-local storage: %s\n", | |
492 | lossage); | |
739d440d UD |
493 | |
494 | /* So far this is module number one. */ | |
495 | bootstrap_map.l_tls_modid = 1; | |
e8ed861d UD |
496 | |
497 | /* There can only be one PT_TLS entry. */ | |
498 | break; | |
739d440d | 499 | } |
ce460d04 | 500 | #endif /* USE___THREAD */ |
739d440d | 501 | |
d66e34cd | 502 | #ifdef ELF_MACHINE_BEFORE_RTLD_RELOC |
86d2c878 | 503 | ELF_MACHINE_BEFORE_RTLD_RELOC (bootstrap_map.l_info); |
d66e34cd RM |
504 | #endif |
505 | ||
32e6df36 UD |
506 | if (bootstrap_map.l_addr || ! bootstrap_map.l_info[VALIDX(DT_GNU_PRELINKED)]) |
507 | { | |
508 | /* Relocate ourselves so we can do normal function calls and | |
509 | data access using the global offset table. */ | |
510 | ||
511 | ELF_DYNAMIC_RELOCATE (&bootstrap_map, 0, 0); | |
512 | } | |
421f82e5 | 513 | |
ea7eb7e3 UD |
514 | /* Please note that we don't allow profiling of this object and |
515 | therefore need not test whether we have to allocate the array | |
516 | for the relocation results (as done in dl-reloc.c). */ | |
421f82e5 | 517 | |
d66e34cd RM |
518 | /* Now life is sane; we can call functions and access global data. |
519 | Set up to use the operating system facilities, and find out from | |
520 | the operating system's program loader where to find the program | |
6a1db4ff UD |
521 | header table in core. Put the rest of _dl_start into a separate |
522 | function, that way the compiler cannot put accesses to the GOT | |
523 | before ELF_DYNAMIC_RELOCATE. */ | |
c0282c06 | 524 | { |
01d8e36d UD |
525 | #ifdef DONT_USE_BOOTSTRAP_MAP |
526 | ElfW(Addr) entry = _dl_start_final (arg); | |
527 | #else | |
4874b009 | 528 | ElfW(Addr) entry = _dl_start_final (arg, &info); |
01d8e36d | 529 | #endif |
c0282c06 UD |
530 | |
531 | #ifndef ELF_MACHINE_START_ADDRESS | |
532 | # define ELF_MACHINE_START_ADDRESS(map, start) (start) | |
533 | #endif | |
534 | ||
d6b5d570 | 535 | return ELF_MACHINE_START_ADDRESS (GL(dl_loaded), entry); |
c0282c06 | 536 | } |
6a1db4ff UD |
537 | } |
538 | ||
539 | ||
d66e34cd | 540 | |
d66e34cd RM |
541 | /* Now life is peachy; we can do all normal operations. |
542 | On to the real work. */ | |
543 | ||
993b3242 UD |
544 | /* Some helper functions. */ |
545 | ||
546 | /* Arguments to relocate_doit. */ | |
547 | struct relocate_args | |
548 | { | |
549 | struct link_map *l; | |
550 | int lazy; | |
551 | }; | |
552 | ||
553 | struct map_args | |
554 | { | |
555 | /* Argument to map_doit. */ | |
556 | char *str; | |
f04b9a68 UD |
557 | struct link_map *loader; |
558 | int is_preloaded; | |
559 | int mode; | |
993b3242 | 560 | /* Return value of map_doit. */ |
f04b9a68 | 561 | struct link_map *map; |
993b3242 UD |
562 | }; |
563 | ||
564 | /* Arguments to version_check_doit. */ | |
565 | struct version_check_args | |
566 | { | |
993b3242 | 567 | int doexit; |
145b8413 | 568 | int dotrace; |
993b3242 UD |
569 | }; |
570 | ||
571 | static void | |
572 | relocate_doit (void *a) | |
573 | { | |
574 | struct relocate_args *args = (struct relocate_args *) a; | |
575 | ||
154d10bd | 576 | _dl_relocate_object (args->l, args->l->l_scope, args->lazy, 0); |
993b3242 UD |
577 | } |
578 | ||
579 | static void | |
580 | map_doit (void *a) | |
581 | { | |
be935610 | 582 | struct map_args *args = (struct map_args *) a; |
154d10bd UD |
583 | args->map = _dl_map_object (args->loader, args->str, |
584 | args->is_preloaded, lt_library, 0, args->mode); | |
993b3242 UD |
585 | } |
586 | ||
587 | static void | |
588 | version_check_doit (void *a) | |
589 | { | |
be935610 | 590 | struct version_check_args *args = (struct version_check_args *) a; |
d6b5d570 | 591 | if (_dl_check_all_versions (GL(dl_loaded), 1, args->dotrace) && args->doexit) |
993b3242 UD |
592 | /* We cannot start the application. Abort now. */ |
593 | _exit (1); | |
594 | } | |
595 | ||
ce37fa88 UD |
596 | |
597 | static inline struct link_map * | |
598 | find_needed (const char *name) | |
599 | { | |
d6b5d570 | 600 | unsigned int n = GL(dl_loaded)->l_searchlist.r_nlist; |
ce37fa88 | 601 | |
be935610 | 602 | while (n-- > 0) |
d6b5d570 UD |
603 | if (_dl_name_match_p (name, GL(dl_loaded)->l_searchlist.r_list[n])) |
604 | return GL(dl_loaded)->l_searchlist.r_list[n]; | |
ce37fa88 UD |
605 | |
606 | /* Should never happen. */ | |
607 | return NULL; | |
608 | } | |
609 | ||
610 | static int | |
611 | match_version (const char *string, struct link_map *map) | |
612 | { | |
a42195db | 613 | const char *strtab = (const void *) D_PTR (map, l_info[DT_STRTAB]); |
ce37fa88 UD |
614 | ElfW(Verdef) *def; |
615 | ||
b0982c4a | 616 | #define VERDEFTAG (DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGIDX (DT_VERDEF)) |
ce37fa88 UD |
617 | if (map->l_info[VERDEFTAG] == NULL) |
618 | /* The file has no symbol versioning. */ | |
619 | return 0; | |
620 | ||
621 | def = (ElfW(Verdef) *) ((char *) map->l_addr | |
622 | + map->l_info[VERDEFTAG]->d_un.d_ptr); | |
623 | while (1) | |
624 | { | |
625 | ElfW(Verdaux) *aux = (ElfW(Verdaux) *) ((char *) def + def->vd_aux); | |
626 | ||
627 | /* Compare the version strings. */ | |
628 | if (strcmp (string, strtab + aux->vda_name) == 0) | |
629 | /* Bingo! */ | |
630 | return 1; | |
631 | ||
632 | /* If no more definitions we failed to find what we want. */ | |
633 | if (def->vd_next == 0) | |
634 | break; | |
635 | ||
636 | /* Next definition. */ | |
637 | def = (ElfW(Verdef) *) ((char *) def + def->vd_next); | |
638 | } | |
639 | ||
640 | return 0; | |
641 | } | |
642 | ||
bf2cc5fb | 643 | #ifdef _LIBC_REENTRANT |
ce460d04 RM |
644 | /* _dl_error_catch_tsd points to this for the single-threaded case. |
645 | It's reset by the thread library for multithreaded programs. */ | |
216455bc RM |
646 | void ** __attribute__ ((const)) |
647 | _dl_initial_error_catch_tsd (void) | |
ce460d04 RM |
648 | { |
649 | static void *data; | |
650 | return &data; | |
651 | } | |
bf2cc5fb | 652 | #endif |
ce460d04 | 653 | |
334fcf2a UD |
654 | #if defined SHARED && defined _LIBC_REENTRANT \ |
655 | && defined __rtld_lock_default_lock_recursive | |
656 | static void rtld_lock_default_lock_recursive (void *lock) | |
657 | { | |
658 | __rtld_lock_default_lock_recursive (lock); | |
659 | } | |
660 | ||
661 | static void rtld_lock_default_unlock_recursive (void *lock) | |
662 | { | |
663 | __rtld_lock_default_unlock_recursive (lock); | |
664 | } | |
665 | #endif | |
666 | ||
667 | ||
392a6b52 UD |
668 | /* The library search path. */ |
669 | static const char *library_path attribute_relro; | |
670 | /* The list preloaded objects. */ | |
671 | static const char *preloadlist attribute_relro; | |
672 | /* Nonzero if information about versions has to be printed. */ | |
673 | static int version_info attribute_relro; | |
a1a9d215 | 674 | |
d66e34cd | 675 | static void |
266180eb | 676 | dl_main (const ElfW(Phdr) *phdr, |
72f70279 | 677 | ElfW(Word) phnum, |
266180eb | 678 | ElfW(Addr) *user_entry) |
d66e34cd | 679 | { |
266180eb | 680 | const ElfW(Phdr) *ph; |
ea278354 | 681 | enum mode mode; |
2064087b RM |
682 | struct link_map **preloads; |
683 | unsigned int npreloads; | |
14bab8de UD |
684 | size_t file_size; |
685 | char *file; | |
164a7164 | 686 | bool has_interp = false; |
77aba05b | 687 | unsigned int i; |
164a7164 UD |
688 | bool prelinked = false; |
689 | bool rtld_is_main = false; | |
5732c4df | 690 | #ifndef HP_TIMING_NONAVAIL |
db276fa1 UD |
691 | hp_timing_t start; |
692 | hp_timing_t stop; | |
693 | hp_timing_t diff; | |
5732c4df | 694 | #endif |
a52d1562 UD |
695 | #ifdef USE_TLS |
696 | void *tcbp; | |
697 | #endif | |
d66e34cd | 698 | |
bf2cc5fb | 699 | #ifdef _LIBC_REENTRANT |
ce460d04 | 700 | /* Explicit initialization since the reloc would just be more work. */ |
216455bc | 701 | GL(dl_error_catch_tsd) = &_dl_initial_error_catch_tsd; |
bf2cc5fb | 702 | #endif |
ce460d04 | 703 | |
adc12574 UD |
704 | #ifdef USE_TLS |
705 | GL(dl_init_static_tls) = &_dl_nothread_init_static_tls; | |
706 | #endif | |
707 | ||
334fcf2a UD |
708 | #if defined SHARED && defined _LIBC_REENTRANT \ |
709 | && defined __rtld_lock_default_lock_recursive | |
710 | GL(dl_rtld_lock_recursive) = rtld_lock_default_lock_recursive; | |
711 | GL(dl_rtld_unlock_recursive) = rtld_lock_default_unlock_recursive; | |
712 | #endif | |
713 | ||
c70ba488 RM |
714 | /* The explicit initialization here is cheaper than processing the reloc |
715 | in the _rtld_local definition's initializer. */ | |
716 | GL(dl_make_stack_executable_hook) = &_dl_make_stack_executable; | |
717 | ||
ea278354 | 718 | /* Process the environment variable which control the behaviour. */ |
ba9fcb3f | 719 | process_envvars (&mode); |
3996f34b | 720 | |
46ec036d | 721 | /* Set up a flag which tells we are just starting. */ |
e6caf4e1 | 722 | INTUSE(_dl_starting_up) = 1; |
46ec036d | 723 | |
a16956f3 | 724 | if (*user_entry == (ElfW(Addr)) ENTRY_POINT) |
0200214b RM |
725 | { |
726 | /* Ho ho. We are not the program interpreter! We are the program | |
727 | itself! This means someone ran ld.so as a command. Well, that | |
728 | might be convenient to do sometimes. We support it by | |
729 | interpreting the args like this: | |
730 | ||
731 | ld.so PROGRAM ARGS... | |
732 | ||
733 | The first argument is the name of a file containing an ELF | |
734 | executable we will load and run with the following arguments. | |
735 | To simplify life here, PROGRAM is searched for using the | |
736 | normal rules for shared objects, rather than $PATH or anything | |
737 | like that. We just load it and use its entry point; we don't | |
738 | pay attention to its PT_INTERP command (we are the interpreter | |
739 | ourselves). This is an easy way to test a new ld.so before | |
740 | installing it. */ | |
164a7164 | 741 | rtld_is_main = true; |
421f82e5 | 742 | |
ffee1316 | 743 | /* Note the place where the dynamic linker actually came from. */ |
e6caf4e1 | 744 | GL(dl_rtld_map).l_name = rtld_progname; |
6a76c115 | 745 | |
fd26970f | 746 | while (_dl_argc > 1) |
e6caf4e1 | 747 | if (! strcmp (INTUSE(_dl_argv)[1], "--list")) |
fd26970f UD |
748 | { |
749 | mode = list; | |
afdca0f2 | 750 | GLRO(dl_lazy) = -1; /* This means do no dependency analysis. */ |
61965e9b | 751 | |
fd26970f UD |
752 | ++_dl_skip_args; |
753 | --_dl_argc; | |
e6caf4e1 | 754 | ++INTUSE(_dl_argv); |
fd26970f | 755 | } |
e6caf4e1 | 756 | else if (! strcmp (INTUSE(_dl_argv)[1], "--verify")) |
fd26970f UD |
757 | { |
758 | mode = verify; | |
6a76c115 | 759 | |
fd26970f UD |
760 | ++_dl_skip_args; |
761 | --_dl_argc; | |
e6caf4e1 | 762 | ++INTUSE(_dl_argv); |
fd26970f | 763 | } |
e6caf4e1 UD |
764 | else if (! strcmp (INTUSE(_dl_argv)[1], "--library-path") |
765 | && _dl_argc > 2) | |
880f421f | 766 | { |
e6caf4e1 | 767 | library_path = INTUSE(_dl_argv)[2]; |
880f421f | 768 | |
310930c1 UD |
769 | _dl_skip_args += 2; |
770 | _dl_argc -= 2; | |
e6caf4e1 | 771 | INTUSE(_dl_argv) += 2; |
310930c1 | 772 | } |
e6caf4e1 UD |
773 | else if (! strcmp (INTUSE(_dl_argv)[1], "--inhibit-rpath") |
774 | && _dl_argc > 2) | |
310930c1 | 775 | { |
afdca0f2 | 776 | GLRO(dl_inhibit_rpath) = INTUSE(_dl_argv)[2]; |
310930c1 | 777 | |
880f421f UD |
778 | _dl_skip_args += 2; |
779 | _dl_argc -= 2; | |
e6caf4e1 | 780 | INTUSE(_dl_argv) += 2; |
880f421f | 781 | } |
fd26970f UD |
782 | else |
783 | break; | |
d66e34cd | 784 | |
61eb22d3 UD |
785 | /* If we have no further argument the program was called incorrectly. |
786 | Grant the user some education. */ | |
787 | if (_dl_argc < 2) | |
35fc382a | 788 | _dl_fatal_printf ("\ |
2bcf29ba | 789 | Usage: ld.so [OPTION]... EXECUTABLE-FILE [ARGS-FOR-PROGRAM...]\n\ |
61eb22d3 UD |
790 | You have invoked `ld.so', the helper program for shared library executables.\n\ |
791 | This program usually lives in the file `/lib/ld.so', and special directives\n\ | |
792 | in executable files using ELF shared libraries tell the system's program\n\ | |
793 | loader to load the helper program from this file. This helper program loads\n\ | |
794 | the shared libraries needed by the program executable, prepares the program\n\ | |
795 | to run, and runs it. You may invoke this helper program directly from the\n\ | |
796 | command line to load and run an ELF executable file; this is like executing\n\ | |
797 | that file itself, but always uses this helper program from the file you\n\ | |
798 | specified, instead of the helper program file specified in the executable\n\ | |
799 | file you run. This is mostly of use for maintainers to test new versions\n\ | |
2bcf29ba UD |
800 | of this helper program; chances are you did not intend to run this program.\n\ |
801 | \n\ | |
b0a01055 UD |
802 | --list list all dependencies and how they are resolved\n\ |
803 | --verify verify that given object really is a dynamically linked\n\ | |
e8b1163e | 804 | object we can handle\n\ |
b0a01055 UD |
805 | --library-path PATH use given PATH instead of content of the environment\n\ |
806 | variable LD_LIBRARY_PATH\n\ | |
fcf70d41 | 807 | --inhibit-rpath LIST ignore RUNPATH and RPATH information in object names\n\ |
35fc382a | 808 | in LIST\n"); |
61eb22d3 | 809 | |
0200214b RM |
810 | ++_dl_skip_args; |
811 | --_dl_argc; | |
e6caf4e1 | 812 | ++INTUSE(_dl_argv); |
91f62ce6 | 813 | |
da832465 UD |
814 | /* Initialize the data structures for the search paths for shared |
815 | objects. */ | |
816 | _dl_init_paths (library_path); | |
817 | ||
c70ba488 RM |
818 | /* The initialization of _dl_stack_flags done below assumes the |
819 | executable's PT_GNU_STACK may have been honored by the kernel, and | |
820 | so a PT_GNU_STACK with PF_X set means the stack started out with | |
821 | execute permission. However, this is not really true if the | |
822 | dynamic linker is the executable the kernel loaded. For this | |
823 | case, we must reinitialize _dl_stack_flags to match the dynamic | |
824 | linker itself. If the dynamic linker was built with a | |
825 | PT_GNU_STACK, then the kernel may have loaded us with a | |
826 | nonexecutable stack that we will have to make executable when we | |
827 | load the program below unless it has a PT_GNU_STACK indicating | |
828 | nonexecutable stack is ok. */ | |
829 | ||
830 | for (ph = phdr; ph < &phdr[phnum]; ++ph) | |
831 | if (ph->p_type == PT_GNU_STACK) | |
832 | { | |
833 | GL(dl_stack_flags) = ph->p_flags; | |
834 | break; | |
835 | } | |
836 | ||
9a821cf9 | 837 | if (__builtin_expect (mode, normal) == verify) |
2de99474 | 838 | { |
8e17ea58 UD |
839 | const char *objname; |
840 | const char *err_str = NULL; | |
993b3242 | 841 | struct map_args args; |
2de99474 | 842 | |
e6caf4e1 | 843 | args.str = rtld_progname; |
f04b9a68 UD |
844 | args.loader = NULL; |
845 | args.is_preloaded = 0; | |
846 | args.mode = __RTLD_OPENEXEC; | |
154d10bd | 847 | (void) _dl_catch_error (&objname, &err_str, map_doit, &args); |
8e17ea58 | 848 | if (__builtin_expect (err_str != NULL, 0)) |
e6caf4e1 UD |
849 | /* We don't free the returned string, the programs stops |
850 | anyway. */ | |
851 | _exit (EXIT_FAILURE); | |
2de99474 UD |
852 | } |
853 | else | |
db276fa1 UD |
854 | { |
855 | HP_TIMING_NOW (start); | |
154d10bd UD |
856 | _dl_map_object (NULL, rtld_progname, 0, lt_library, 0, |
857 | __RTLD_OPENEXEC); | |
db276fa1 | 858 | HP_TIMING_NOW (stop); |
61e0617a | 859 | |
db276fa1 UD |
860 | HP_TIMING_DIFF (load_time, start, stop); |
861 | } | |
2de99474 | 862 | |
d6b5d570 UD |
863 | phdr = GL(dl_loaded)->l_phdr; |
864 | phnum = GL(dl_loaded)->l_phnum; | |
143e2b96 UD |
865 | /* We overwrite here a pointer to a malloc()ed string. But since |
866 | the malloc() implementation used at this point is the dummy | |
867 | implementations which has no real free() function it does not | |
868 | makes sense to free the old string first. */ | |
d6b5d570 UD |
869 | GL(dl_loaded)->l_name = (char *) ""; |
870 | *user_entry = GL(dl_loaded)->l_entry; | |
0200214b RM |
871 | } |
872 | else | |
873 | { | |
874 | /* Create a link_map for the executable itself. | |
875 | This will be what dlopen on "" returns. */ | |
87c812c2 | 876 | _dl_new_object ((char *) "", "", lt_executable, NULL); |
d6b5d570 | 877 | if (GL(dl_loaded) == NULL) |
35fc382a | 878 | _dl_fatal_printf ("cannot allocate memory for link map\n"); |
d6b5d570 UD |
879 | GL(dl_loaded)->l_phdr = phdr; |
880 | GL(dl_loaded)->l_phnum = phnum; | |
881 | GL(dl_loaded)->l_entry = *user_entry; | |
da832465 | 882 | |
61e0617a UD |
883 | /* At this point we are in a bit of trouble. We would have to |
884 | fill in the values for l_dev and l_ino. But in general we | |
885 | do not know where the file is. We also do not handle AT_EXECFD | |
886 | even if it would be passed up. | |
887 | ||
888 | We leave the values here defined to 0. This is normally no | |
889 | problem as the program code itself is normally no shared | |
890 | object and therefore cannot be loaded dynamically. Nothing | |
891 | prevent the use of dynamic binaries and in these situations | |
892 | we might get problems. We might not be able to find out | |
893 | whether the object is already loaded. But since there is no | |
894 | easy way out and because the dynamic binary must also not | |
895 | have an SONAME we ignore this program for now. If it becomes | |
896 | a problem we can force people using SONAMEs. */ | |
897 | ||
97a51d8a UD |
898 | /* We delay initializing the path structure until we got the dynamic |
899 | information for the program. */ | |
0200214b RM |
900 | } |
901 | ||
d6b5d570 | 902 | GL(dl_loaded)->l_map_end = 0; |
052b6a6c | 903 | /* Perhaps the executable has no PT_LOAD header entries at all. */ |
d6b5d570 | 904 | GL(dl_loaded)->l_map_start = ~0; |
e7beef5f | 905 | /* We opened the file, account for it. */ |
d6b5d570 | 906 | ++GL(dl_loaded)->l_opencount; |
052b6a6c | 907 | |
0200214b | 908 | /* Scan the program header table for the dynamic section. */ |
72f70279 | 909 | for (ph = phdr; ph < &phdr[phnum]; ++ph) |
0200214b RM |
910 | switch (ph->p_type) |
911 | { | |
da832465 UD |
912 | case PT_PHDR: |
913 | /* Find out the load address. */ | |
d6b5d570 | 914 | GL(dl_loaded)->l_addr = (ElfW(Addr)) phdr - ph->p_vaddr; |
da832465 | 915 | break; |
0200214b RM |
916 | case PT_DYNAMIC: |
917 | /* This tells us where to find the dynamic section, | |
918 | which tells us everything we need to do. */ | |
d6b5d570 | 919 | GL(dl_loaded)->l_ld = (void *) GL(dl_loaded)->l_addr + ph->p_vaddr; |
0200214b RM |
920 | break; |
921 | case PT_INTERP: | |
922 | /* This "interpreter segment" was used by the program loader to | |
923 | find the program interpreter, which is this program itself, the | |
924 | dynamic linker. We note what name finds us, so that a future | |
925 | dlopen call or DT_NEEDED entry, for something that wants to link | |
926 | against the dynamic linker as a shared library, will know that | |
927 | the shared object is already loaded. */ | |
d6b5d570 | 928 | _dl_rtld_libname.name = ((const char *) GL(dl_loaded)->l_addr |
be935610 | 929 | + ph->p_vaddr); |
752a2a50 | 930 | /* _dl_rtld_libname.next = NULL; Already zero. */ |
d6b5d570 | 931 | GL(dl_rtld_map).l_libname = &_dl_rtld_libname; |
f41c8091 UD |
932 | |
933 | /* Ordinarilly, we would get additional names for the loader from | |
934 | our DT_SONAME. This can't happen if we were actually linked as | |
935 | a static executable (detect this case when we have no DYNAMIC). | |
936 | If so, assume the filename component of the interpreter path to | |
937 | be our SONAME, and add it to our name list. */ | |
d6b5d570 | 938 | if (GL(dl_rtld_map).l_ld == NULL) |
f41c8091 | 939 | { |
88794e30 UD |
940 | const char *p = NULL; |
941 | const char *cp = _dl_rtld_libname.name; | |
942 | ||
943 | /* Find the filename part of the path. */ | |
944 | while (*cp != '\0') | |
945 | if (*cp++ == '/') | |
946 | p = cp; | |
947 | ||
948 | if (p != NULL) | |
f41c8091 | 949 | { |
88794e30 | 950 | _dl_rtld_libname2.name = p; |
752a2a50 | 951 | /* _dl_rtld_libname2.next = NULL; Already zero. */ |
f41c8091 UD |
952 | _dl_rtld_libname.next = &_dl_rtld_libname2; |
953 | } | |
954 | } | |
955 | ||
164a7164 | 956 | has_interp = true; |
0200214b | 957 | break; |
052b6a6c | 958 | case PT_LOAD: |
052b6a6c UD |
959 | { |
960 | ElfW(Addr) mapstart; | |
2373b30e UD |
961 | ElfW(Addr) allocend; |
962 | ||
963 | /* Remember where the main program starts in memory. */ | |
d6b5d570 UD |
964 | mapstart = (GL(dl_loaded)->l_addr |
965 | + (ph->p_vaddr & ~(ph->p_align - 1))); | |
966 | if (GL(dl_loaded)->l_map_start > mapstart) | |
967 | GL(dl_loaded)->l_map_start = mapstart; | |
2373b30e UD |
968 | |
969 | /* Also where it ends. */ | |
d6b5d570 UD |
970 | allocend = GL(dl_loaded)->l_addr + ph->p_vaddr + ph->p_memsz; |
971 | if (GL(dl_loaded)->l_map_end < allocend) | |
972 | GL(dl_loaded)->l_map_end = allocend; | |
052b6a6c UD |
973 | } |
974 | break; | |
a2f1f5cb UD |
975 | #ifdef USE_TLS |
976 | case PT_TLS: | |
aed283dd UD |
977 | if (ph->p_memsz > 0) |
978 | { | |
979 | /* Note that in the case the dynamic linker we duplicate work | |
980 | here since we read the PT_TLS entry already in | |
981 | _dl_start_final. But the result is repeatable so do not | |
982 | check for this special but unimportant case. */ | |
983 | GL(dl_loaded)->l_tls_blocksize = ph->p_memsz; | |
984 | GL(dl_loaded)->l_tls_align = ph->p_align; | |
99fe3b0e UD |
985 | if (ph->p_align == 0) |
986 | GL(dl_loaded)->l_tls_firstbyte_offset = 0; | |
987 | else | |
988 | GL(dl_loaded)->l_tls_firstbyte_offset = (ph->p_vaddr | |
989 | & (ph->p_align - 1)); | |
aed283dd UD |
990 | GL(dl_loaded)->l_tls_initimage_size = ph->p_filesz; |
991 | GL(dl_loaded)->l_tls_initimage = (void *) ph->p_vaddr; | |
992 | ||
993 | /* This image gets the ID one. */ | |
994 | GL(dl_tls_max_dtv_idx) = GL(dl_loaded)->l_tls_modid = 1; | |
995 | } | |
a2f1f5cb UD |
996 | break; |
997 | #endif | |
ecdeaac0 RM |
998 | case PT_GNU_STACK: |
999 | GL(dl_stack_flags) = ph->p_flags; | |
1000 | break; | |
e8ed861d UD |
1001 | |
1002 | case PT_GNU_RELRO: | |
1003 | GL(dl_loaded)->l_relro_addr = ph->p_vaddr; | |
1004 | GL(dl_loaded)->l_relro_size = ph->p_memsz; | |
1005 | break; | |
0200214b | 1006 | } |
75aafc71 RM |
1007 | #ifdef USE_TLS |
1008 | /* Adjust the address of the TLS initialization image in case | |
1009 | the executable is actually an ET_DYN object. */ | |
1010 | if (GL(dl_loaded)->l_tls_initimage != NULL) | |
1011 | GL(dl_loaded)->l_tls_initimage | |
1012 | = (char *) GL(dl_loaded)->l_tls_initimage + GL(dl_loaded)->l_addr; | |
1013 | #endif | |
d6b5d570 UD |
1014 | if (! GL(dl_loaded)->l_map_end) |
1015 | GL(dl_loaded)->l_map_end = ~0; | |
1016 | if (! GL(dl_rtld_map).l_libname && GL(dl_rtld_map).l_name) | |
c84142e8 UD |
1017 | { |
1018 | /* We were invoked directly, so the program might not have a | |
1019 | PT_INTERP. */ | |
d6b5d570 | 1020 | _dl_rtld_libname.name = GL(dl_rtld_map).l_name; |
3fb55878 | 1021 | /* _dl_rtld_libname.next = NULL; Already zero. */ |
d6b5d570 | 1022 | GL(dl_rtld_map).l_libname = &_dl_rtld_libname; |
c84142e8 | 1023 | } |
ffee1316 | 1024 | else |
d6b5d570 | 1025 | assert (GL(dl_rtld_map).l_libname); /* How else did we get here? */ |
0200214b | 1026 | |
9a51759b UD |
1027 | if (! rtld_is_main) |
1028 | { | |
1029 | /* Extract the contents of the dynamic section for easy access. */ | |
479aa8ec | 1030 | elf_get_dynamic_info (GL(dl_loaded), NULL); |
d6b5d570 | 1031 | if (GL(dl_loaded)->l_info[DT_HASH]) |
9a51759b | 1032 | /* Set up our cache of pointers into the hash table. */ |
d6b5d570 | 1033 | _dl_setup_hash (GL(dl_loaded)); |
9a51759b | 1034 | } |
0200214b | 1035 | |
9a821cf9 | 1036 | if (__builtin_expect (mode, normal) == verify) |
e2102c14 UD |
1037 | { |
1038 | /* We were called just to verify that this is a dynamic | |
1039 | executable using us as the program interpreter. Exit with an | |
1040 | error if we were not able to load the binary or no interpreter | |
1041 | is specified (i.e., this is no dynamically linked binary. */ | |
d6b5d570 | 1042 | if (GL(dl_loaded)->l_ld == NULL) |
e2102c14 | 1043 | _exit (1); |
e2102c14 UD |
1044 | |
1045 | /* We allow here some platform specific code. */ | |
1046 | #ifdef DISTINGUISH_LIB_VERSIONS | |
1047 | DISTINGUISH_LIB_VERSIONS; | |
1048 | #endif | |
eb406346 | 1049 | _exit (has_interp ? 0 : 2); |
e2102c14 UD |
1050 | } |
1051 | ||
9a51759b | 1052 | if (! rtld_is_main) |
97a51d8a UD |
1053 | /* Initialize the data structures for the search paths for shared |
1054 | objects. */ | |
120b4c49 | 1055 | _dl_init_paths (library_path); |
97a51d8a | 1056 | |
0200214b | 1057 | /* Put the link_map for ourselves on the chain so it can be found by |
ceb2d9aa | 1058 | name. Note that at this point the global chain of link maps contains |
d6b5d570 UD |
1059 | exactly one element, which is pointed to by dl_loaded. */ |
1060 | if (! GL(dl_rtld_map).l_name) | |
ffee1316 RM |
1061 | /* If not invoked directly, the dynamic linker shared object file was |
1062 | found by the PT_INTERP name. */ | |
d6b5d570 UD |
1063 | GL(dl_rtld_map).l_name = (char *) GL(dl_rtld_map).l_libname->name; |
1064 | GL(dl_rtld_map).l_type = lt_library; | |
1065 | GL(dl_loaded)->l_next = &GL(dl_rtld_map); | |
1066 | GL(dl_rtld_map).l_prev = GL(dl_loaded); | |
1067 | ++GL(dl_nloaded); | |
e8ed861d | 1068 | ++GL(dl_load_adds); |
0200214b | 1069 | |
97fd3a30 UD |
1070 | /* If LD_USE_LOAD_BIAS env variable has not been seen, default |
1071 | to not using bias for non-prelinked PIEs and libraries | |
1072 | and using it for executables or prelinked PIEs or libraries. */ | |
afdca0f2 UD |
1073 | if (GLRO(dl_use_load_bias) == (ElfW(Addr)) -2) |
1074 | GLRO(dl_use_load_bias) = (GL(dl_loaded)->l_addr == 0) ? -1 : 0; | |
97fd3a30 | 1075 | |
553eca26 UD |
1076 | /* Set up the program header information for the dynamic linker |
1077 | itself. It is needed in the dl_iterate_phdr() callbacks. */ | |
4cfde896 | 1078 | ElfW(Ehdr) *rtld_ehdr = (ElfW(Ehdr) *) GL(dl_rtld_map).l_map_start; |
e8ed861d UD |
1079 | ElfW(Phdr) *rtld_phdr = (ElfW(Phdr) *) (GL(dl_rtld_map).l_map_start |
1080 | + rtld_ehdr->e_phoff); | |
1081 | GL(dl_rtld_map).l_phdr = rtld_phdr; | |
553eca26 UD |
1082 | GL(dl_rtld_map).l_phnum = rtld_ehdr->e_phnum; |
1083 | ||
e8ed861d UD |
1084 | /* PT_GNU_RELRO is usually the last phdr. */ |
1085 | size_t cnt = rtld_ehdr->e_phnum; | |
1086 | while (cnt-- > 0) | |
1087 | if (rtld_phdr[cnt].p_type == PT_GNU_RELRO) | |
1088 | { | |
1089 | GL(dl_rtld_map).l_relro_addr = rtld_phdr[cnt].p_vaddr; | |
1090 | GL(dl_rtld_map).l_relro_size = rtld_phdr[cnt].p_memsz; | |
1091 | break; | |
1092 | } | |
1093 | ||
14bab8de | 1094 | /* We have two ways to specify objects to preload: via environment |
49c091e5 | 1095 | variable and via the file /etc/ld.so.preload. The latter can also |
14bab8de | 1096 | be used when security is enabled. */ |
2064087b RM |
1097 | preloads = NULL; |
1098 | npreloads = 0; | |
14bab8de | 1099 | |
db33f7d4 | 1100 | if (__builtin_expect (preloadlist != NULL, 0)) |
c4029823 | 1101 | { |
566efee2 UD |
1102 | /* The LD_PRELOAD environment variable gives list of libraries |
1103 | separated by white space or colons that are loaded before the | |
fd26970f UD |
1104 | executable's dependencies and prepended to the global scope |
1105 | list. If the binary is running setuid all elements | |
1106 | containing a '/' are ignored since it is insecure. */ | |
1107 | char *list = strdupa (preloadlist); | |
1108 | char *p; | |
db276fa1 UD |
1109 | |
1110 | HP_TIMING_NOW (start); | |
1111 | ||
9710f75d UD |
1112 | /* Prevent optimizing strsep. Speed is not important here. */ |
1113 | while ((p = (strsep) (&list, " :")) != NULL) | |
e2102c14 | 1114 | if (p[0] != '\0' |
e6caf4e1 | 1115 | && (__builtin_expect (! INTUSE(__libc_enable_secure), 1) |
db33f7d4 | 1116 | || strchr (p, '/') == NULL)) |
fd26970f | 1117 | { |
154d10bd UD |
1118 | struct link_map *new_map = _dl_map_object (GL(dl_loaded), p, 1, |
1119 | lt_library, 0, 0); | |
42c4f32a | 1120 | if (++new_map->l_opencount == 1) |
bd355af0 UD |
1121 | /* It is no duplicate. */ |
1122 | ++npreloads; | |
fd26970f | 1123 | } |
db276fa1 UD |
1124 | |
1125 | HP_TIMING_NOW (stop); | |
1126 | HP_TIMING_DIFF (diff, start, stop); | |
1127 | HP_TIMING_ACCUM_NT (load_time, diff); | |
c4029823 UD |
1128 | } |
1129 | ||
14bab8de | 1130 | /* Read the contents of the file. */ |
f04b9a68 UD |
1131 | const char preload_file[] = "/etc/ld.so.preload"; |
1132 | file = _dl_sysdep_read_whole_file (preload_file, &file_size, | |
14bab8de | 1133 | PROT_READ | PROT_WRITE); |
40b07f5b | 1134 | if (__builtin_expect (file != MAP_FAILED, 0)) |
14bab8de UD |
1135 | { |
1136 | /* Parse the file. It contains names of libraries to be loaded, | |
1137 | separated by white spaces or `:'. It may also contain | |
1138 | comments introduced by `#'. */ | |
1139 | char *problem; | |
1140 | char *runp; | |
1141 | size_t rest; | |
1142 | ||
1143 | /* Eliminate comments. */ | |
1144 | runp = file; | |
1145 | rest = file_size; | |
1146 | while (rest > 0) | |
1147 | { | |
1148 | char *comment = memchr (runp, '#', rest); | |
1149 | if (comment == NULL) | |
1150 | break; | |
1151 | ||
1152 | rest -= comment - runp; | |
1153 | do | |
1154 | *comment = ' '; | |
1155 | while (--rest > 0 && *++comment != '\n'); | |
1156 | } | |
1157 | ||
1158 | /* We have one problematic case: if we have a name at the end of | |
1159 | the file without a trailing terminating characters, we cannot | |
1160 | place the \0. Handle the case separately. */ | |
49891c10 UD |
1161 | if (file[file_size - 1] != ' ' && file[file_size - 1] != '\t' |
1162 | && file[file_size - 1] != '\n' && file[file_size - 1] != ':') | |
14bab8de UD |
1163 | { |
1164 | problem = &file[file_size]; | |
1165 | while (problem > file && problem[-1] != ' ' && problem[-1] != '\t' | |
49891c10 | 1166 | && problem[-1] != '\n' && problem[-1] != ':') |
14bab8de UD |
1167 | --problem; |
1168 | ||
1169 | if (problem > file) | |
1170 | problem[-1] = '\0'; | |
1171 | } | |
1172 | else | |
49891c10 UD |
1173 | { |
1174 | problem = NULL; | |
1175 | file[file_size - 1] = '\0'; | |
1176 | } | |
14bab8de | 1177 | |
db276fa1 UD |
1178 | HP_TIMING_NOW (start); |
1179 | ||
14bab8de UD |
1180 | if (file != problem) |
1181 | { | |
1182 | char *p; | |
e2102c14 | 1183 | runp = file; |
14bab8de | 1184 | while ((p = strsep (&runp, ": \t\n")) != NULL) |
e2102c14 UD |
1185 | if (p[0] != '\0') |
1186 | { | |
f04b9a68 UD |
1187 | const char *objname; |
1188 | const char *err_str = NULL; | |
1189 | struct map_args args; | |
1190 | ||
1191 | args.str = p; | |
1192 | args.loader = GL(dl_loaded); | |
1193 | args.is_preloaded = 1; | |
1194 | args.mode = 0; | |
1195 | ||
154d10bd | 1196 | (void) _dl_catch_error (&objname, &err_str, map_doit, &args); |
f04b9a68 UD |
1197 | if (__builtin_expect (err_str != NULL, 0)) |
1198 | { | |
1199 | _dl_error_printf ("\ | |
1200 | ERROR: ld.so: object '%s' from %s cannot be preloaded: ignored.\n", | |
1201 | p, preload_file); | |
1202 | /* No need to call free, this is still before the libc's | |
1203 | malloc is used. */ | |
1204 | } | |
1205 | else if (++args.map->l_opencount == 1) | |
e2102c14 UD |
1206 | /* It is no duplicate. */ |
1207 | ++npreloads; | |
1208 | } | |
14bab8de UD |
1209 | } |
1210 | ||
1211 | if (problem != NULL) | |
1212 | { | |
1213 | char *p = strndupa (problem, file_size - (problem - file)); | |
154d10bd UD |
1214 | struct link_map *new_map = _dl_map_object (GL(dl_loaded), p, 1, |
1215 | lt_library, 0, 0); | |
42c4f32a | 1216 | if (++new_map->l_opencount == 1) |
bd355af0 UD |
1217 | /* It is no duplicate. */ |
1218 | ++npreloads; | |
14bab8de UD |
1219 | } |
1220 | ||
db276fa1 UD |
1221 | HP_TIMING_NOW (stop); |
1222 | HP_TIMING_DIFF (diff, start, stop); | |
1223 | HP_TIMING_ACCUM_NT (load_time, diff); | |
1224 | ||
14bab8de UD |
1225 | /* We don't need the file anymore. */ |
1226 | __munmap (file, file_size); | |
1227 | } | |
1228 | ||
db33f7d4 | 1229 | if (__builtin_expect (npreloads, 0) != 0) |
14bab8de UD |
1230 | { |
1231 | /* Set up PRELOADS with a vector of the preloaded libraries. */ | |
1232 | struct link_map *l; | |
14bab8de | 1233 | preloads = __alloca (npreloads * sizeof preloads[0]); |
d6b5d570 | 1234 | l = GL(dl_rtld_map).l_next; /* End of the chain before preloads. */ |
14bab8de UD |
1235 | i = 0; |
1236 | do | |
1237 | { | |
1238 | preloads[i++] = l; | |
1239 | l = l->l_next; | |
1240 | } while (l); | |
1241 | assert (i == npreloads); | |
1242 | } | |
1243 | ||
f866314b | 1244 | #ifdef NEED_DL_SYSINFO |
3b3ddb4f | 1245 | struct link_map *sysinfo_map = NULL; |
afdca0f2 | 1246 | if (GLRO(dl_sysinfo_dso) != NULL) |
f866314b | 1247 | { |
f866314b UD |
1248 | /* Do an abridged version of the work _dl_map_object_from_fd would do |
1249 | to map in the object. It's already mapped and prelinked (and | |
1250 | better be, since it's read-only and so we couldn't relocate it). | |
1251 | We just want our data structures to describe it as if we had just | |
1252 | mapped and relocated it normally. */ | |
1253 | struct link_map *l = _dl_new_object ((char *) "", "", lt_library, NULL); | |
1254 | if (__builtin_expect (l != NULL, 1)) | |
1255 | { | |
f556dbfa | 1256 | static ElfW(Dyn) dyn_temp[DL_RO_DYN_TEMP_CNT]; |
479aa8ec | 1257 | |
afdca0f2 UD |
1258 | l->l_phdr = ((const void *) GLRO(dl_sysinfo_dso) |
1259 | + GLRO(dl_sysinfo_dso)->e_phoff); | |
1260 | l->l_phnum = GLRO(dl_sysinfo_dso)->e_phnum; | |
f866314b UD |
1261 | for (uint_fast16_t i = 0; i < l->l_phnum; ++i) |
1262 | { | |
1263 | const ElfW(Phdr) *const ph = &l->l_phdr[i]; | |
1264 | if (ph->p_type == PT_DYNAMIC) | |
1265 | { | |
1266 | l->l_ld = (void *) ph->p_vaddr; | |
1267 | l->l_ldnum = ph->p_memsz / sizeof (ElfW(Dyn)); | |
f866314b | 1268 | } |
3b3ddb4f | 1269 | else if (ph->p_type == PT_LOAD) |
c776b3d7 | 1270 | { |
3b3ddb4f UD |
1271 | if (! l->l_addr) |
1272 | l->l_addr = ph->p_vaddr; | |
1273 | else if (ph->p_vaddr + ph->p_memsz >= l->l_map_end) | |
1274 | l->l_map_end = ph->p_vaddr + ph->p_memsz; | |
c776b3d7 | 1275 | } |
f866314b | 1276 | } |
afdca0f2 | 1277 | l->l_map_start = (ElfW(Addr)) GLRO(dl_sysinfo_dso); |
3b3ddb4f UD |
1278 | l->l_addr = l->l_map_start - l->l_addr; |
1279 | l->l_map_end += l->l_addr; | |
49ad572a | 1280 | l->l_ld = (void *) ((ElfW(Addr)) l->l_ld + l->l_addr); |
479aa8ec | 1281 | elf_get_dynamic_info (l, dyn_temp); |
f866314b UD |
1282 | _dl_setup_hash (l); |
1283 | l->l_relocated = 1; | |
1284 | ||
1285 | /* Now that we have the info handy, use the DSO image's soname | |
b49329d9 RM |
1286 | so this object can be looked up by name. Note that we do not |
1287 | set l_name here. That field gives the file name of the DSO, | |
1288 | and this DSO is not associated with any file. */ | |
f866314b | 1289 | if (l->l_info[DT_SONAME] != NULL) |
f556dbfa UD |
1290 | { |
1291 | /* Work around a kernel problem. The kernel cannot handle | |
1292 | addresses in the vsyscall DSO pages in writev() calls. */ | |
1293 | const char *dsoname = ((char *) D_PTR (l, l_info[DT_STRTAB]) | |
1294 | + l->l_info[DT_SONAME]->d_un.d_val); | |
1295 | size_t len = strlen (dsoname); | |
b49329d9 RM |
1296 | char *copy = malloc (len); |
1297 | if (copy == NULL) | |
f556dbfa | 1298 | _dl_fatal_printf ("out of memory\n"); |
b49329d9 | 1299 | l->l_libname->name = memcpy (copy, dsoname, len); |
f556dbfa | 1300 | } |
3b3ddb4f UD |
1301 | |
1302 | /* We have a prelinked DSO preloaded by the system. */ | |
afdca0f2 UD |
1303 | if (GLRO(dl_sysinfo) == DL_SYSINFO_DEFAULT) |
1304 | GLRO(dl_sysinfo) = GLRO(dl_sysinfo_dso)->e_entry + l->l_addr; | |
3b3ddb4f | 1305 | sysinfo_map = l; |
f866314b UD |
1306 | } |
1307 | } | |
1308 | #endif | |
1309 | ||
2064087b RM |
1310 | /* Load all the libraries specified by DT_NEEDED entries. If LD_PRELOAD |
1311 | specified some libraries to load, these are inserted before the actual | |
1312 | dependencies in the executable's searchlist for symbol resolution. */ | |
db276fa1 | 1313 | HP_TIMING_NOW (start); |
154d10bd | 1314 | _dl_map_object_deps (GL(dl_loaded), preloads, npreloads, mode == trace, 0); |
db276fa1 UD |
1315 | HP_TIMING_NOW (stop); |
1316 | HP_TIMING_DIFF (diff, start, stop); | |
1317 | HP_TIMING_ACCUM_NT (load_time, diff); | |
e3e35cfc | 1318 | |
42c4f32a UD |
1319 | /* Mark all objects as being in the global scope and set the open |
1320 | counter. */ | |
d6b5d570 | 1321 | for (i = GL(dl_loaded)->l_searchlist.r_nlist; i > 0; ) |
42c4f32a UD |
1322 | { |
1323 | --i; | |
d6b5d570 UD |
1324 | GL(dl_loaded)->l_searchlist.r_list[i]->l_global = 1; |
1325 | ++GL(dl_loaded)->l_searchlist.r_list[i]->l_opencount; | |
42c4f32a | 1326 | } |
d66e34cd | 1327 | |
2064087b | 1328 | #ifndef MAP_ANON |
f332db02 RM |
1329 | /* We are done mapping things, so close the zero-fill descriptor. */ |
1330 | __close (_dl_zerofd); | |
1331 | _dl_zerofd = -1; | |
2064087b | 1332 | #endif |
f332db02 | 1333 | |
f9496a7b | 1334 | /* Remove _dl_rtld_map from the chain. */ |
d6b5d570 UD |
1335 | GL(dl_rtld_map).l_prev->l_next = GL(dl_rtld_map).l_next; |
1336 | if (GL(dl_rtld_map).l_next) | |
1337 | GL(dl_rtld_map).l_next->l_prev = GL(dl_rtld_map).l_prev; | |
f9496a7b | 1338 | |
d6b5d570 | 1339 | if (__builtin_expect (GL(dl_rtld_map).l_opencount > 1, 1)) |
0200214b | 1340 | { |
f9496a7b RM |
1341 | /* Some DT_NEEDED entry referred to the interpreter object itself, so |
1342 | put it back in the list of visible objects. We insert it into the | |
1343 | chain in symbol search order because gdb uses the chain's order as | |
1344 | its symbol search order. */ | |
77aba05b | 1345 | i = 1; |
d6b5d570 | 1346 | while (GL(dl_loaded)->l_searchlist.r_list[i] != &GL(dl_rtld_map)) |
f9496a7b | 1347 | ++i; |
d6b5d570 | 1348 | GL(dl_rtld_map).l_prev = GL(dl_loaded)->l_searchlist.r_list[i - 1]; |
b2bcd61a | 1349 | if (__builtin_expect (mode, normal) == normal) |
3b3ddb4f UD |
1350 | { |
1351 | GL(dl_rtld_map).l_next = (i + 1 < GL(dl_loaded)->l_searchlist.r_nlist | |
1352 | ? GL(dl_loaded)->l_searchlist.r_list[i + 1] | |
1353 | : NULL); | |
1354 | #ifdef NEED_DL_SYSINFO | |
1355 | if (sysinfo_map != NULL | |
1356 | && GL(dl_rtld_map).l_prev->l_next == sysinfo_map | |
1357 | && GL(dl_rtld_map).l_next != sysinfo_map) | |
1358 | GL(dl_rtld_map).l_prev = sysinfo_map; | |
1359 | #endif | |
1360 | } | |
b2bcd61a UD |
1361 | else |
1362 | /* In trace mode there might be an invisible object (which we | |
1363 | could not find) after the previous one in the search list. | |
1364 | In this case it doesn't matter much where we put the | |
1365 | interpreter object, so we just initialize the list pointer so | |
1366 | that the assertion below holds. */ | |
d6b5d570 | 1367 | GL(dl_rtld_map).l_next = GL(dl_rtld_map).l_prev->l_next; |
b2bcd61a | 1368 | |
d6b5d570 UD |
1369 | assert (GL(dl_rtld_map).l_prev->l_next == GL(dl_rtld_map).l_next); |
1370 | GL(dl_rtld_map).l_prev->l_next = &GL(dl_rtld_map); | |
3fb55878 | 1371 | if (GL(dl_rtld_map).l_next != NULL) |
f9496a7b | 1372 | { |
d6b5d570 UD |
1373 | assert (GL(dl_rtld_map).l_next->l_prev == GL(dl_rtld_map).l_prev); |
1374 | GL(dl_rtld_map).l_next->l_prev = &GL(dl_rtld_map); | |
f9496a7b | 1375 | } |
0200214b | 1376 | } |
d66e34cd | 1377 | |
c84142e8 UD |
1378 | /* Now let us see whether all libraries are available in the |
1379 | versions we need. */ | |
1380 | { | |
993b3242 UD |
1381 | struct version_check_args args; |
1382 | args.doexit = mode == normal; | |
145b8413 | 1383 | args.dotrace = mode == trace; |
993b3242 | 1384 | _dl_receive_error (print_missing_version, version_check_doit, &args); |
c84142e8 UD |
1385 | } |
1386 | ||
bff334e0 UD |
1387 | #ifdef USE_TLS |
1388 | /* Now it is time to determine the layout of the static TLS block | |
1389 | and allocate it for the initial thread. Note that we always | |
1390 | allocate the static block, we never defer it even if no | |
1391 | DF_STATIC_TLS bit is set. The reason is that we know glibc will | |
1392 | use the static model. First add the dynamic linker to the list | |
1393 | if it also uses TLS. */ | |
1394 | if (GL(dl_rtld_map).l_tls_blocksize != 0) | |
1395 | /* Assign a module ID. */ | |
1396 | GL(dl_rtld_map).l_tls_modid = _dl_next_tls_modid (); | |
1397 | ||
131fd126 UD |
1398 | # ifndef TLS_INIT_TP_EXPENSIVE |
1399 | # define TLS_INIT_TP_EXPENSIVE 0 | |
1400 | # endif | |
1401 | ||
2d148689 RM |
1402 | /* We do not initialize any of the TLS functionality unless any of the |
1403 | initial modules uses TLS. This makes dynamic loading of modules with | |
1404 | TLS impossible, but to support it requires either eagerly doing setup | |
1405 | now or lazily doing it later. Doing it now makes us incompatible with | |
1406 | an old kernel that can't perform TLS_INIT_TP, even if no TLS is ever | |
1407 | used. Trying to do it lazily is too hairy to try when there could be | |
1408 | multiple threads (from a non-TLS-using libpthread). */ | |
bbe35eb5 | 1409 | if (!TLS_INIT_TP_EXPENSIVE || GL(dl_tls_max_dtv_idx) > 0) |
bff334e0 UD |
1410 | { |
1411 | struct link_map *l; | |
1412 | size_t nelem; | |
1413 | struct dtv_slotinfo *slotinfo; | |
1414 | ||
1415 | /* Number of elements in the static TLS block. */ | |
1416 | GL(dl_tls_static_nelem) = GL(dl_tls_max_dtv_idx); | |
1417 | ||
1418 | /* Allocate the array which contains the information about the | |
1419 | dtv slots. We allocate a few entries more than needed to | |
1420 | avoid the need for reallocation. */ | |
1421 | nelem = GL(dl_tls_max_dtv_idx) + 1 + TLS_SLOTINFO_SURPLUS; | |
1422 | ||
1423 | /* Allocate. */ | |
1424 | GL(dl_tls_dtv_slotinfo_list) = (struct dtv_slotinfo_list *) | |
1425 | malloc (sizeof (struct dtv_slotinfo_list) | |
1426 | + nelem * sizeof (struct dtv_slotinfo)); | |
1427 | /* No need to check the return value. If memory allocation failed | |
1428 | the program would have been terminated. */ | |
1429 | ||
1430 | slotinfo = memset (GL(dl_tls_dtv_slotinfo_list)->slotinfo, '\0', | |
1431 | nelem * sizeof (struct dtv_slotinfo)); | |
1432 | GL(dl_tls_dtv_slotinfo_list)->len = nelem; | |
1433 | GL(dl_tls_dtv_slotinfo_list)->next = NULL; | |
1434 | ||
1435 | /* Fill in the information from the loaded modules. */ | |
1436 | for (l = GL(dl_loaded), i = 0; l != NULL; l = l->l_next) | |
1437 | if (l->l_tls_blocksize != 0) | |
1438 | /* This is a module with TLS data. Store the map reference. | |
1439 | The generation counter is zero. */ | |
1440 | slotinfo[++i].map = l; | |
1441 | assert (i == GL(dl_tls_max_dtv_idx)); | |
1442 | ||
216455bc | 1443 | /* Compute the TLS offsets for the various blocks. */ |
bff334e0 UD |
1444 | _dl_determine_tlsoffset (); |
1445 | ||
1446 | /* Construct the static TLS block and the dtv for the initial | |
1447 | thread. For some platforms this will include allocating memory | |
1448 | for the thread descriptor. The memory for the TLS block will | |
1449 | never be freed. It should be allocated accordingly. The dtv | |
1450 | array can be changed if dynamic loading requires it. */ | |
a816b435 | 1451 | tcbp = _dl_allocate_tls_storage (); |
bff334e0 UD |
1452 | if (tcbp == NULL) |
1453 | _dl_fatal_printf ("\ | |
935f95dd | 1454 | cannot allocate TLS data structures for initial thread"); |
08da0621 RM |
1455 | |
1456 | /* Store for detection of the special case by __tls_get_addr | |
1457 | so it knows not to pass this dtv to the normal realloc. */ | |
8784cc18 | 1458 | GL(dl_initial_dtv) = GET_DTV (tcbp); |
bff334e0 UD |
1459 | } |
1460 | #endif | |
1461 | ||
9a821cf9 | 1462 | if (__builtin_expect (mode, normal) != normal) |
0200214b RM |
1463 | { |
1464 | /* We were run just to list the shared libraries. It is | |
1465 | important that we do this before real relocation, because the | |
1466 | functions we call below for output may no longer work properly | |
1467 | after relocation. */ | |
81f3ac4c UD |
1468 | struct link_map *l; |
1469 | ||
afdca0f2 | 1470 | if (GLRO(dl_debug_mask) & DL_DEBUG_PRELINK) |
ceb2d9aa | 1471 | { |
81f3ac4c | 1472 | struct r_scope_elem *scope = &GL(dl_loaded)->l_searchlist; |
ceb2d9aa | 1473 | |
81f3ac4c | 1474 | for (i = 0; i < scope->r_nlist; i++) |
32e6df36 | 1475 | { |
81f3ac4c UD |
1476 | l = scope->r_list [i]; |
1477 | if (l->l_faked) | |
32e6df36 | 1478 | { |
81f3ac4c UD |
1479 | _dl_printf ("\t%s => not found\n", l->l_libname->name); |
1480 | continue; | |
1481 | } | |
afdca0f2 UD |
1482 | if (_dl_name_match_p (GLRO(dl_trace_prelink), l)) |
1483 | GLRO(dl_trace_prelink_map) = l; | |
81f3ac4c UD |
1484 | _dl_printf ("\t%s => %s (0x%0*Zx, 0x%0*Zx)", |
1485 | l->l_libname->name[0] ? l->l_libname->name | |
1486 | : rtld_progname ?: "<main program>", | |
1487 | l->l_name[0] ? l->l_name | |
1488 | : rtld_progname ?: "<main program>", | |
d347a4ab UD |
1489 | (int) sizeof l->l_map_start * 2, |
1490 | (size_t) l->l_map_start, | |
1491 | (int) sizeof l->l_addr * 2, | |
1492 | (size_t) l->l_addr); | |
bff334e0 | 1493 | #ifdef USE_TLS |
81f3ac4c UD |
1494 | if (l->l_tls_modid) |
1495 | _dl_printf (" TLS(0x%Zx, 0x%0*Zx)\n", l->l_tls_modid, | |
1496 | (int) sizeof l->l_tls_offset * 2, | |
d347a4ab | 1497 | (size_t) l->l_tls_offset); |
81f3ac4c | 1498 | else |
bff334e0 | 1499 | #endif |
81f3ac4c | 1500 | _dl_printf ("\n"); |
32e6df36 | 1501 | } |
ceb2d9aa | 1502 | } |
81f3ac4c UD |
1503 | else if (! GL(dl_loaded)->l_info[DT_NEEDED]) |
1504 | _dl_printf ("\tstatically linked\n"); | |
1505 | else | |
1506 | { | |
1507 | for (l = GL(dl_loaded)->l_next; l; l = l->l_next) | |
1508 | if (l->l_faked) | |
1509 | /* The library was not found. */ | |
1510 | _dl_printf ("\t%s => not found\n", l->l_libname->name); | |
1511 | else | |
1512 | _dl_printf ("\t%s => %s (0x%0*Zx)\n", l->l_libname->name, | |
1513 | l->l_name, (int) sizeof l->l_map_start * 2, | |
d347a4ab | 1514 | (size_t) l->l_map_start); |
81f3ac4c | 1515 | } |
1a3a58fd | 1516 | |
9a821cf9 | 1517 | if (__builtin_expect (mode, trace) != trace) |
5a47e7f2 | 1518 | for (i = 1; i < (unsigned int) _dl_argc; ++i) |
cddcfecf RM |
1519 | { |
1520 | const ElfW(Sym) *ref = NULL; | |
c0282c06 UD |
1521 | ElfW(Addr) loadbase; |
1522 | lookup_t result; | |
c0282c06 | 1523 | |
154d10bd UD |
1524 | result = _dl_lookup_symbol (INTUSE(_dl_argv)[i], GL(dl_loaded), |
1525 | &ref, GL(dl_loaded)->l_scope, | |
1526 | ELF_RTYPE_CLASS_PLT, 1); | |
c0282c06 UD |
1527 | |
1528 | loadbase = LOOKUP_VALUE_ADDRESS (result); | |
1529 | ||
35fc382a | 1530 | _dl_printf ("%s found at 0x%0*Zd in object at 0x%0*Zd\n", |
e6caf4e1 | 1531 | INTUSE(_dl_argv)[i], |
d347a4ab UD |
1532 | (int) sizeof ref->st_value * 2, |
1533 | (size_t) ref->st_value, | |
1534 | (int) sizeof loadbase * 2, (size_t) loadbase); | |
cddcfecf | 1535 | } |
ce37fa88 | 1536 | else |
fd26970f | 1537 | { |
667b0577 | 1538 | /* If LD_WARN is set warn about undefined symbols. */ |
afdca0f2 | 1539 | if (GLRO(dl_lazy) >= 0 && GLRO(dl_verbose)) |
ce37fa88 UD |
1540 | { |
1541 | /* We have to do symbol dependency testing. */ | |
1542 | struct relocate_args args; | |
1543 | struct link_map *l; | |
993b3242 | 1544 | |
afdca0f2 | 1545 | args.lazy = GLRO(dl_lazy); |
fd26970f | 1546 | |
d6b5d570 | 1547 | l = GL(dl_loaded); |
ce37fa88 UD |
1548 | while (l->l_next) |
1549 | l = l->l_next; | |
1550 | do | |
1551 | { | |
d6b5d570 | 1552 | if (l != &GL(dl_rtld_map) && ! l->l_faked) |
ce37fa88 UD |
1553 | { |
1554 | args.l = l; | |
1555 | _dl_receive_error (print_unresolved, relocate_doit, | |
1556 | &args); | |
ce37fa88 UD |
1557 | } |
1558 | l = l->l_prev; | |
1559 | } while (l); | |
32e6df36 | 1560 | |
afdca0f2 | 1561 | if ((GLRO(dl_debug_mask) & DL_DEBUG_PRELINK) |
d6b5d570 | 1562 | && GL(dl_rtld_map).l_opencount > 1) |
154d10bd UD |
1563 | _dl_relocate_object (&GL(dl_rtld_map), GL(dl_loaded)->l_scope, |
1564 | 0, 0); | |
ce37fa88 UD |
1565 | } |
1566 | ||
b0982c4a | 1567 | #define VERNEEDTAG (DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGIDX (DT_VERNEED)) |
120b4c49 | 1568 | if (version_info) |
fd26970f | 1569 | { |
ce37fa88 UD |
1570 | /* Print more information. This means here, print information |
1571 | about the versions needed. */ | |
1572 | int first = 1; | |
d6b5d570 | 1573 | struct link_map *map = GL(dl_loaded); |
ce37fa88 | 1574 | |
d6b5d570 | 1575 | for (map = GL(dl_loaded); map != NULL; map = map->l_next) |
fd26970f | 1576 | { |
f41c8091 | 1577 | const char *strtab; |
ce37fa88 | 1578 | ElfW(Dyn) *dyn = map->l_info[VERNEEDTAG]; |
f41c8091 UD |
1579 | ElfW(Verneed) *ent; |
1580 | ||
1581 | if (dyn == NULL) | |
1582 | continue; | |
1583 | ||
a42195db | 1584 | strtab = (const void *) D_PTR (map, l_info[DT_STRTAB]); |
f41c8091 | 1585 | ent = (ElfW(Verneed) *) (map->l_addr + dyn->d_un.d_ptr); |
ce37fa88 | 1586 | |
f41c8091 | 1587 | if (first) |
ce37fa88 | 1588 | { |
35fc382a | 1589 | _dl_printf ("\n\tVersion information:\n"); |
f41c8091 UD |
1590 | first = 0; |
1591 | } | |
ce37fa88 | 1592 | |
35fc382a | 1593 | _dl_printf ("\t%s:\n", |
e6caf4e1 | 1594 | map->l_name[0] ? map->l_name : rtld_progname); |
f41c8091 UD |
1595 | |
1596 | while (1) | |
1597 | { | |
1598 | ElfW(Vernaux) *aux; | |
1599 | struct link_map *needed; | |
ce37fa88 | 1600 | |
f41c8091 UD |
1601 | needed = find_needed (strtab + ent->vn_file); |
1602 | aux = (ElfW(Vernaux) *) ((char *) ent + ent->vn_aux); | |
ce37fa88 UD |
1603 | |
1604 | while (1) | |
1605 | { | |
f41c8091 UD |
1606 | const char *fname = NULL; |
1607 | ||
f41c8091 | 1608 | if (needed != NULL |
ba9fcb3f UD |
1609 | && match_version (strtab + aux->vna_name, |
1610 | needed)) | |
f41c8091 UD |
1611 | fname = needed->l_name; |
1612 | ||
35fc382a UD |
1613 | _dl_printf ("\t\t%s (%s) %s=> %s\n", |
1614 | strtab + ent->vn_file, | |
1615 | strtab + aux->vna_name, | |
1616 | aux->vna_flags & VER_FLG_WEAK | |
1617 | ? "[WEAK] " : "", | |
1618 | fname ?: "not found"); | |
ce37fa88 | 1619 | |
f41c8091 UD |
1620 | if (aux->vna_next == 0) |
1621 | /* No more symbols. */ | |
ce37fa88 UD |
1622 | break; |
1623 | ||
f41c8091 UD |
1624 | /* Next symbol. */ |
1625 | aux = (ElfW(Vernaux) *) ((char *) aux | |
1626 | + aux->vna_next); | |
ce37fa88 | 1627 | } |
f41c8091 UD |
1628 | |
1629 | if (ent->vn_next == 0) | |
1630 | /* No more dependencies. */ | |
1631 | break; | |
1632 | ||
1633 | /* Next dependency. */ | |
1634 | ent = (ElfW(Verneed) *) ((char *) ent + ent->vn_next); | |
ce37fa88 | 1635 | } |
fd26970f | 1636 | } |
ce37fa88 | 1637 | } |
fd26970f | 1638 | } |
d66e34cd | 1639 | |
0200214b RM |
1640 | _exit (0); |
1641 | } | |
86d2c878 | 1642 | |
d6b5d570 | 1643 | if (GL(dl_loaded)->l_info [ADDRIDX (DT_GNU_LIBLIST)] |
afdca0f2 | 1644 | && ! __builtin_expect (GLRO(dl_profile) != NULL, 0)) |
32e6df36 UD |
1645 | { |
1646 | ElfW(Lib) *liblist, *liblistend; | |
1647 | struct link_map **r_list, **r_listend, *l; | |
9710f75d UD |
1648 | const char *strtab = (const void *) D_PTR (GL(dl_loaded), |
1649 | l_info[DT_STRTAB]); | |
32e6df36 | 1650 | |
d6b5d570 | 1651 | assert (GL(dl_loaded)->l_info [VALIDX (DT_GNU_LIBLISTSZ)] != NULL); |
32e6df36 | 1652 | liblist = (ElfW(Lib) *) |
d6b5d570 | 1653 | GL(dl_loaded)->l_info [ADDRIDX (DT_GNU_LIBLIST)]->d_un.d_ptr; |
32e6df36 UD |
1654 | liblistend = (ElfW(Lib) *) |
1655 | ((char *) liblist | |
d6b5d570 UD |
1656 | + GL(dl_loaded)->l_info [VALIDX (DT_GNU_LIBLISTSZ)]->d_un.d_val); |
1657 | r_list = GL(dl_loaded)->l_searchlist.r_list; | |
1658 | r_listend = r_list + GL(dl_loaded)->l_searchlist.r_nlist; | |
32e6df36 UD |
1659 | |
1660 | for (; r_list < r_listend && liblist < liblistend; r_list++) | |
1661 | { | |
1662 | l = *r_list; | |
1663 | ||
d6b5d570 | 1664 | if (l == GL(dl_loaded)) |
32e6df36 UD |
1665 | continue; |
1666 | ||
1667 | /* If the library is not mapped where it should, fail. */ | |
1668 | if (l->l_addr) | |
1669 | break; | |
1670 | ||
1671 | /* Next, check if checksum matches. */ | |
1672 | if (l->l_info [VALIDX(DT_CHECKSUM)] == NULL | |
1673 | || l->l_info [VALIDX(DT_CHECKSUM)]->d_un.d_val | |
1674 | != liblist->l_checksum) | |
1675 | break; | |
1676 | ||
1677 | if (l->l_info [VALIDX(DT_GNU_PRELINKED)] == NULL | |
1678 | || l->l_info [VALIDX(DT_GNU_PRELINKED)]->d_un.d_val | |
1679 | != liblist->l_time_stamp) | |
1680 | break; | |
1681 | ||
1682 | if (! _dl_name_match_p (strtab + liblist->l_name, l)) | |
1683 | break; | |
1684 | ||
1685 | ++liblist; | |
1686 | } | |
1687 | ||
1688 | ||
1689 | if (r_list == r_listend && liblist == liblistend) | |
164a7164 | 1690 | prelinked = true; |
32e6df36 | 1691 | |
afdca0f2 | 1692 | if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_LIBS, 0)) |
32e6df36 UD |
1693 | _dl_printf ("\nprelink checking: %s\n", prelinked ? "ok" : "failed"); |
1694 | } | |
1695 | ||
ed20b3d9 UD |
1696 | |
1697 | /* Initialize _r_debug. */ | |
1698 | struct r_debug *r = _dl_debug_initialize (GL(dl_rtld_map).l_addr); | |
1699 | { | |
1700 | struct link_map *l; | |
1701 | ||
1702 | l = GL(dl_loaded); | |
1703 | ||
1704 | #ifdef ELF_MACHINE_DEBUG_SETUP | |
1705 | ||
1706 | /* Some machines (e.g. MIPS) don't use DT_DEBUG in this way. */ | |
1707 | ||
1708 | ELF_MACHINE_DEBUG_SETUP (l, r); | |
1709 | ELF_MACHINE_DEBUG_SETUP (&GL(dl_rtld_map), r); | |
1710 | ||
1711 | #else | |
1712 | ||
1713 | if (l->l_info[DT_DEBUG] != NULL) | |
1714 | /* There is a DT_DEBUG entry in the dynamic section. Fill it in | |
1715 | with the run-time address of the r_debug structure */ | |
1716 | l->l_info[DT_DEBUG]->d_un.d_ptr = (ElfW(Addr)) r; | |
1717 | ||
1718 | /* Fill in the pointer in the dynamic linker's own dynamic section, in | |
1719 | case you run gdb on the dynamic linker directly. */ | |
1720 | if (GL(dl_rtld_map).l_info[DT_DEBUG] != NULL) | |
1721 | GL(dl_rtld_map).l_info[DT_DEBUG]->d_un.d_ptr = (ElfW(Addr)) r; | |
1722 | #endif | |
1723 | } | |
1724 | ||
32e6df36 UD |
1725 | if (prelinked) |
1726 | { | |
d89ae1d5 RM |
1727 | struct link_map *l; |
1728 | ||
d6b5d570 | 1729 | if (GL(dl_loaded)->l_info [ADDRIDX (DT_GNU_CONFLICT)] != NULL) |
32e6df36 UD |
1730 | { |
1731 | ElfW(Rela) *conflict, *conflictend; | |
1732 | #ifndef HP_TIMING_NONAVAIL | |
1733 | hp_timing_t start; | |
1734 | hp_timing_t stop; | |
1735 | #endif | |
1736 | ||
1737 | HP_TIMING_NOW (start); | |
d6b5d570 | 1738 | assert (GL(dl_loaded)->l_info [VALIDX (DT_GNU_CONFLICTSZ)] != NULL); |
32e6df36 | 1739 | conflict = (ElfW(Rela) *) |
d89ae1d5 | 1740 | GL(dl_loaded)->l_info [ADDRIDX (DT_GNU_CONFLICT)]->d_un.d_ptr; |
32e6df36 | 1741 | conflictend = (ElfW(Rela) *) |
d89ae1d5 RM |
1742 | ((char *) conflict |
1743 | + GL(dl_loaded)->l_info [VALIDX (DT_GNU_CONFLICTSZ)]->d_un.d_val); | |
d6b5d570 | 1744 | _dl_resolve_conflicts (GL(dl_loaded), conflict, conflictend); |
32e6df36 UD |
1745 | HP_TIMING_NOW (stop); |
1746 | HP_TIMING_DIFF (relocate_time, start, stop); | |
1747 | } | |
1748 | ||
d89ae1d5 RM |
1749 | |
1750 | /* Mark all the objects so we know they have been already relocated. */ | |
1751 | for (l = GL(dl_loaded); l != NULL; l = l->l_next) | |
e8648a5a UD |
1752 | { |
1753 | l->l_relocated = 1; | |
1754 | if (l->l_relro_size) | |
1755 | _dl_protect_relro (l); | |
1756 | } | |
d89ae1d5 | 1757 | |
32e6df36 UD |
1758 | _dl_sysdep_start_cleanup (); |
1759 | } | |
1760 | else | |
164a7164 UD |
1761 | { |
1762 | /* Now we have all the objects loaded. Relocate them all except for | |
1763 | the dynamic linker itself. We do this in reverse order so that copy | |
1764 | relocs of earlier objects overwrite the data written by later | |
1765 | objects. We do not re-relocate the dynamic linker itself in this | |
1766 | loop because that could result in the GOT entries for functions we | |
1767 | call being changed, and that would break us. It is safe to relocate | |
1768 | the dynamic linker out of order because it has no copy relocs (we | |
1769 | know that because it is self-contained). */ | |
1770 | ||
1771 | struct link_map *l; | |
afdca0f2 | 1772 | int consider_profiling = GLRO(dl_profile) != NULL; |
8b07d6a8 | 1773 | #ifndef HP_TIMING_NONAVAIL |
164a7164 UD |
1774 | hp_timing_t start; |
1775 | hp_timing_t stop; | |
1776 | hp_timing_t add; | |
8b07d6a8 | 1777 | #endif |
c0fb8a56 | 1778 | |
164a7164 | 1779 | /* If we are profiling we also must do lazy reloaction. */ |
afdca0f2 | 1780 | GLRO(dl_lazy) |= consider_profiling; |
c0fb8a56 | 1781 | |
164a7164 UD |
1782 | l = GL(dl_loaded); |
1783 | while (l->l_next) | |
1784 | l = l->l_next; | |
db276fa1 | 1785 | |
164a7164 UD |
1786 | HP_TIMING_NOW (start); |
1787 | do | |
1788 | { | |
1789 | /* While we are at it, help the memory handling a bit. We have to | |
1790 | mark some data structures as allocated with the fake malloc() | |
1791 | implementation in ld.so. */ | |
1792 | struct libname_list *lnp = l->l_libname->next; | |
752a2a50 | 1793 | |
164a7164 UD |
1794 | while (__builtin_expect (lnp != NULL, 0)) |
1795 | { | |
1796 | lnp->dont_free = 1; | |
1797 | lnp = lnp->next; | |
1798 | } | |
752a2a50 | 1799 | |
164a7164 | 1800 | if (l != &GL(dl_rtld_map)) |
154d10bd UD |
1801 | _dl_relocate_object (l, l->l_scope, GLRO(dl_lazy), |
1802 | consider_profiling); | |
be935610 | 1803 | |
164a7164 UD |
1804 | l = l->l_prev; |
1805 | } | |
1806 | while (l); | |
1807 | HP_TIMING_NOW (stop); | |
1808 | ||
1809 | HP_TIMING_DIFF (relocate_time, start, stop); | |
1810 | ||
1811 | /* Do any necessary cleanups for the startup OS interface code. | |
1812 | We do these now so that no calls are made after rtld re-relocation | |
1813 | which might be resolved to different functions than we expect. | |
1814 | We cannot do this before relocating the other objects because | |
1815 | _dl_relocate_object might need to call `mprotect' for DT_TEXTREL. */ | |
1816 | _dl_sysdep_start_cleanup (); | |
1817 | ||
1818 | /* Now enable profiling if needed. Like the previous call, | |
1819 | this has to go here because the calls it makes should use the | |
1820 | rtld versions of the functions (particularly calloc()), but it | |
1821 | needs to have _dl_profile_map set up by the relocator. */ | |
1822 | if (__builtin_expect (GL(dl_profile_map) != NULL, 0)) | |
1823 | /* We must prepare the profiling. */ | |
53bfdc1c | 1824 | _dl_start_profile (); |
164a7164 UD |
1825 | |
1826 | if (GL(dl_rtld_map).l_opencount > 1) | |
1827 | { | |
1828 | /* There was an explicit ref to the dynamic linker as a shared lib. | |
1829 | Re-relocate ourselves with user-controlled symbol definitions. */ | |
1830 | HP_TIMING_NOW (start); | |
154d10bd | 1831 | _dl_relocate_object (&GL(dl_rtld_map), GL(dl_loaded)->l_scope, 0, 0); |
164a7164 UD |
1832 | HP_TIMING_NOW (stop); |
1833 | HP_TIMING_DIFF (add, start, stop); | |
1834 | HP_TIMING_ACCUM_NT (relocate_time, add); | |
1835 | } | |
1836 | } | |
ac16e905 | 1837 | |
be935610 | 1838 | /* Now set up the variable which helps the assembler startup code. */ |
d6b5d570 UD |
1839 | GL(dl_main_searchlist) = &GL(dl_loaded)->l_searchlist; |
1840 | GL(dl_global_scope)[0] = &GL(dl_loaded)->l_searchlist; | |
be935610 | 1841 | |
32e6df36 | 1842 | /* Save the information about the original global scope list since |
604510f7 | 1843 | we need it in the memory handling later. */ |
d6b5d570 | 1844 | GL(dl_initial_searchlist) = *GL(dl_main_searchlist); |
604510f7 | 1845 | |
131fd126 UD |
1846 | #ifndef NONTLS_INIT_TP |
1847 | # define NONTLS_INIT_TP do { } while (0) | |
1848 | #endif | |
1849 | ||
a816b435 | 1850 | #ifdef USE_TLS |
131fd126 | 1851 | if (GL(dl_tls_max_dtv_idx) > 0 || USE___THREAD || !TLS_INIT_TP_EXPENSIVE) |
a816b435 RM |
1852 | { |
1853 | /* Now that we have completed relocation, the initializer data | |
1854 | for the TLS blocks has its final values and we can copy them | |
1855 | into the main thread's TLS area, which we allocated above. */ | |
1856 | _dl_allocate_tls_init (tcbp); | |
1857 | ||
ce460d04 RM |
1858 | /* And finally install it for the main thread. If ld.so itself uses |
1859 | TLS we know the thread pointer was initialized earlier. */ | |
fde89ad0 RM |
1860 | const char *lossage = TLS_INIT_TP (tcbp, USE___THREAD); |
1861 | if (__builtin_expect (lossage != NULL, 0)) | |
1862 | _dl_fatal_printf ("cannot set up thread-local storage: %s\n", lossage); | |
a816b435 | 1863 | } |
131fd126 | 1864 | else |
a816b435 | 1865 | #endif |
131fd126 | 1866 | NONTLS_INIT_TP; |
a816b435 | 1867 | |
ed20b3d9 UD |
1868 | /* Notify the debugger that all objects are now mapped in. */ |
1869 | r->r_state = RT_ADD; | |
154d10bd | 1870 | _dl_debug_state (); |
0200214b | 1871 | |
08cac4ac UD |
1872 | #ifndef MAP_COPY |
1873 | /* We must munmap() the cache file. */ | |
154d10bd | 1874 | _dl_unload_cache (); |
08cac4ac UD |
1875 | #endif |
1876 | ||
d66e34cd RM |
1877 | /* Once we return, _dl_sysdep_start will invoke |
1878 | the DT_INIT functions and then *USER_ENTRY. */ | |
1879 | } | |
fd26970f UD |
1880 | \f |
1881 | /* This is a little helper function for resolving symbols while | |
1882 | tracing the binary. */ | |
1883 | static void | |
c84142e8 UD |
1884 | print_unresolved (int errcode __attribute__ ((unused)), const char *objname, |
1885 | const char *errstring) | |
fd26970f | 1886 | { |
3996f34b | 1887 | if (objname[0] == '\0') |
e6caf4e1 | 1888 | objname = rtld_progname ?: "<main program>"; |
35fc382a | 1889 | _dl_error_printf ("%s (%s)\n", errstring, objname); |
fd26970f | 1890 | } |
c84142e8 UD |
1891 | \f |
1892 | /* This is a little helper function for resolving symbols while | |
1893 | tracing the binary. */ | |
1894 | static void | |
1895 | print_missing_version (int errcode __attribute__ ((unused)), | |
1896 | const char *objname, const char *errstring) | |
1897 | { | |
e6caf4e1 | 1898 | _dl_error_printf ("%s: %s: %s\n", rtld_progname ?: "<program name unknown>", |
35fc382a | 1899 | objname, errstring); |
c84142e8 | 1900 | } |
ea278354 | 1901 | \f |
7dea968e | 1902 | /* Nonzero if any of the debugging options is enabled. */ |
392a6b52 | 1903 | static int any_debug attribute_relro; |
7dea968e | 1904 | |
b5efde2f UD |
1905 | /* Process the string given as the parameter which explains which debugging |
1906 | options are enabled. */ | |
1907 | static void | |
14c44e2e | 1908 | process_dl_debug (const char *dl_debug) |
b5efde2f | 1909 | { |
3e2040c8 UD |
1910 | /* When adding new entries make sure that the maximal length of a name |
1911 | is correctly handled in the LD_DEBUG_HELP code below. */ | |
1912 | static const struct | |
1913 | { | |
379d4ec4 UD |
1914 | unsigned char len; |
1915 | const char name[10]; | |
3e2040c8 UD |
1916 | const char helptext[41]; |
1917 | unsigned short int mask; | |
1918 | } debopts[] = | |
1919 | { | |
379d4ec4 UD |
1920 | #define LEN_AND_STR(str) sizeof (str) - 1, str |
1921 | { LEN_AND_STR ("libs"), "display library search paths", | |
3e2040c8 | 1922 | DL_DEBUG_LIBS | DL_DEBUG_IMPCALLS }, |
379d4ec4 | 1923 | { LEN_AND_STR ("reloc"), "display relocation processing", |
3e2040c8 | 1924 | DL_DEBUG_RELOC | DL_DEBUG_IMPCALLS }, |
379d4ec4 | 1925 | { LEN_AND_STR ("files"), "display progress for input file", |
3e2040c8 | 1926 | DL_DEBUG_FILES | DL_DEBUG_IMPCALLS }, |
379d4ec4 | 1927 | { LEN_AND_STR ("symbols"), "display symbol table processing", |
3e2040c8 | 1928 | DL_DEBUG_SYMBOLS | DL_DEBUG_IMPCALLS }, |
379d4ec4 | 1929 | { LEN_AND_STR ("bindings"), "display information about symbol binding", |
3e2040c8 | 1930 | DL_DEBUG_BINDINGS | DL_DEBUG_IMPCALLS }, |
379d4ec4 | 1931 | { LEN_AND_STR ("versions"), "display version dependencies", |
3e2040c8 | 1932 | DL_DEBUG_VERSIONS | DL_DEBUG_IMPCALLS }, |
379d4ec4 | 1933 | { LEN_AND_STR ("all"), "all previous options combined", |
3e2040c8 UD |
1934 | DL_DEBUG_LIBS | DL_DEBUG_RELOC | DL_DEBUG_FILES | DL_DEBUG_SYMBOLS |
1935 | | DL_DEBUG_BINDINGS | DL_DEBUG_VERSIONS | DL_DEBUG_IMPCALLS }, | |
379d4ec4 | 1936 | { LEN_AND_STR ("statistics"), "display relocation statistics", |
3e2040c8 | 1937 | DL_DEBUG_STATISTICS }, |
379d4ec4 | 1938 | { LEN_AND_STR ("help"), "display this help message and exit", |
3e2040c8 UD |
1939 | DL_DEBUG_HELP }, |
1940 | }; | |
1941 | #define ndebopts (sizeof (debopts) / sizeof (debopts[0])) | |
3e2040c8 | 1942 | |
379d4ec4 UD |
1943 | /* Skip separating white spaces and commas. */ |
1944 | while (*dl_debug != '\0') | |
b5efde2f | 1945 | { |
379d4ec4 | 1946 | if (*dl_debug != ' ' && *dl_debug != ',' && *dl_debug != ':') |
b5efde2f | 1947 | { |
3e2040c8 | 1948 | size_t cnt; |
379d4ec4 | 1949 | size_t len = 1; |
77aba05b | 1950 | |
379d4ec4 UD |
1951 | while (dl_debug[len] != '\0' && dl_debug[len] != ' ' |
1952 | && dl_debug[len] != ',' && dl_debug[len] != ':') | |
1953 | ++len; | |
14c44e2e | 1954 | |
3e2040c8 | 1955 | for (cnt = 0; cnt < ndebopts; ++cnt) |
379d4ec4 UD |
1956 | if (debopts[cnt].len == len |
1957 | && memcmp (dl_debug, debopts[cnt].name, len) == 0) | |
3e2040c8 | 1958 | { |
afdca0f2 | 1959 | GLRO(dl_debug_mask) |= debopts[cnt].mask; |
5688da55 | 1960 | any_debug = 1; |
3e2040c8 UD |
1961 | break; |
1962 | } | |
77aba05b | 1963 | |
3e2040c8 UD |
1964 | if (cnt == ndebopts) |
1965 | { | |
1966 | /* Display a warning and skip everything until next | |
1967 | separator. */ | |
1968 | char *copy = strndupa (dl_debug, len); | |
1969 | _dl_error_printf ("\ | |
1970 | warning: debug option `%s' unknown; try LD_DEBUG=help\n", copy); | |
379d4ec4 UD |
1971 | } |
1972 | ||
1973 | dl_debug += len; | |
1974 | continue; | |
3e2040c8 | 1975 | } |
379d4ec4 UD |
1976 | |
1977 | ++dl_debug; | |
3e2040c8 | 1978 | } |
77aba05b | 1979 | |
afdca0f2 | 1980 | if (GLRO(dl_debug_mask) & DL_DEBUG_HELP) |
3e2040c8 UD |
1981 | { |
1982 | size_t cnt; | |
14c44e2e | 1983 | |
3e2040c8 UD |
1984 | _dl_printf ("\ |
1985 | Valid options for the LD_DEBUG environment variable are:\n\n"); | |
db276fa1 | 1986 | |
3e2040c8 | 1987 | for (cnt = 0; cnt < ndebopts; ++cnt) |
37d8b778 UD |
1988 | _dl_printf (" %.*s%s%s\n", debopts[cnt].len, debopts[cnt].name, |
1989 | " " + debopts[cnt].len - 3, | |
3e2040c8 | 1990 | debopts[cnt].helptext); |
14c44e2e | 1991 | |
3e2040c8 UD |
1992 | _dl_printf ("\n\ |
1993 | To direct the debugging output into a file instead of standard output\n\ | |
1994 | a filename can be specified using the LD_DEBUG_OUTPUT environment variable.\n"); | |
1995 | _exit (0); | |
b5efde2f | 1996 | } |
b5efde2f UD |
1997 | } |
1998 | \f | |
ea278354 UD |
1999 | /* Process all environments variables the dynamic linker must recognize. |
2000 | Since all of them start with `LD_' we are a bit smarter while finding | |
2001 | all the entries. */ | |
9360906d | 2002 | extern char **_environ attribute_hidden; |
67c94753 | 2003 | |
d6b5d570 | 2004 | |
ea278354 | 2005 | static void |
ba9fcb3f | 2006 | process_envvars (enum mode *modep) |
ea278354 | 2007 | { |
67c94753 | 2008 | char **runp = _environ; |
ea278354 UD |
2009 | char *envline; |
2010 | enum mode mode = normal; | |
7dea968e | 2011 | char *debug_output = NULL; |
ea278354 UD |
2012 | |
2013 | /* This is the default place for profiling data file. */ | |
afdca0f2 | 2014 | GLRO(dl_profile_output) |
e6caf4e1 | 2015 | = &"/var/tmp\0/var/profile"[INTUSE(__libc_enable_secure) ? 9 : 0]; |
ea278354 UD |
2016 | |
2017 | while ((envline = _dl_next_ld_env_entry (&runp)) != NULL) | |
2018 | { | |
379d4ec4 UD |
2019 | size_t len = 0; |
2020 | ||
2021 | while (envline[len] != '\0' && envline[len] != '=') | |
2022 | ++len; | |
ea278354 | 2023 | |
75e8d1f5 UD |
2024 | if (envline[len] != '=') |
2025 | /* This is a "LD_" variable at the end of the string without | |
2026 | a '=' character. Ignore it since otherwise we will access | |
2027 | invalid memory below. */ | |
67c94753 | 2028 | continue; |
75e8d1f5 | 2029 | |
67c94753 | 2030 | switch (len) |
ea278354 | 2031 | { |
14c44e2e UD |
2032 | case 4: |
2033 | /* Warning level, verbose or not. */ | |
67c94753 | 2034 | if (memcmp (envline, "WARN", 4) == 0) |
afdca0f2 | 2035 | GLRO(dl_verbose) = envline[5] != '\0'; |
14c44e2e | 2036 | break; |
ea278354 | 2037 | |
14c44e2e UD |
2038 | case 5: |
2039 | /* Debugging of the dynamic linker? */ | |
67c94753 UD |
2040 | if (memcmp (envline, "DEBUG", 5) == 0) |
2041 | process_dl_debug (&envline[6]); | |
14c44e2e | 2042 | break; |
b5efde2f | 2043 | |
14c44e2e UD |
2044 | case 7: |
2045 | /* Print information about versions. */ | |
67c94753 | 2046 | if (memcmp (envline, "VERBOSE", 7) == 0) |
14c44e2e | 2047 | { |
67c94753 | 2048 | version_info = envline[8] != '\0'; |
14c44e2e UD |
2049 | break; |
2050 | } | |
7dea968e | 2051 | |
14c44e2e | 2052 | /* List of objects to be preloaded. */ |
67c94753 | 2053 | if (memcmp (envline, "PRELOAD", 7) == 0) |
14c44e2e | 2054 | { |
67c94753 | 2055 | preloadlist = &envline[8]; |
14c44e2e UD |
2056 | break; |
2057 | } | |
120b4c49 | 2058 | |
14c44e2e | 2059 | /* Which shared object shall be profiled. */ |
c95f3fd4 | 2060 | if (memcmp (envline, "PROFILE", 7) == 0 && envline[8] != '\0') |
afdca0f2 | 2061 | GLRO(dl_profile) = &envline[8]; |
14c44e2e | 2062 | break; |
120b4c49 | 2063 | |
14c44e2e UD |
2064 | case 8: |
2065 | /* Do we bind early? */ | |
67c94753 | 2066 | if (memcmp (envline, "BIND_NOW", 8) == 0) |
f53c03c2 | 2067 | { |
afdca0f2 | 2068 | GLRO(dl_lazy) = envline[9] == '\0'; |
f53c03c2 UD |
2069 | break; |
2070 | } | |
67c94753 | 2071 | if (memcmp (envline, "BIND_NOT", 8) == 0) |
afdca0f2 | 2072 | GLRO(dl_bind_not) = envline[9] != '\0'; |
14c44e2e | 2073 | break; |
ea278354 | 2074 | |
14c44e2e UD |
2075 | case 9: |
2076 | /* Test whether we want to see the content of the auxiliary | |
2077 | array passed up from the kernel. */ | |
67c94753 | 2078 | if (memcmp (envline, "SHOW_AUXV", 9) == 0) |
14c44e2e UD |
2079 | _dl_show_auxv (); |
2080 | break; | |
ea278354 | 2081 | |
12264bd7 | 2082 | case 10: |
3081378b | 2083 | /* Mask for the important hardware capabilities. */ |
67c94753 | 2084 | if (memcmp (envline, "HWCAP_MASK", 10) == 0) |
afdca0f2 UD |
2085 | GLRO(dl_hwcap_mask) = __strtoul_internal (&envline[11], NULL, |
2086 | 0, 0); | |
12264bd7 UD |
2087 | break; |
2088 | ||
f787edde UD |
2089 | case 11: |
2090 | /* Path where the binary is found. */ | |
e6caf4e1 | 2091 | if (!INTUSE(__libc_enable_secure) |
67c94753 | 2092 | && memcmp (envline, "ORIGIN_PATH", 11) == 0) |
afdca0f2 | 2093 | GLRO(dl_origin_path) = &envline[12]; |
f787edde UD |
2094 | break; |
2095 | ||
14c44e2e | 2096 | case 12: |
dec126b4 | 2097 | /* The library search path. */ |
67c94753 | 2098 | if (memcmp (envline, "LIBRARY_PATH", 12) == 0) |
dec126b4 | 2099 | { |
67c94753 | 2100 | library_path = &envline[13]; |
dec126b4 UD |
2101 | break; |
2102 | } | |
2103 | ||
14c44e2e | 2104 | /* Where to place the profiling data file. */ |
67c94753 | 2105 | if (memcmp (envline, "DEBUG_OUTPUT", 12) == 0) |
14c44e2e | 2106 | { |
67c94753 | 2107 | debug_output = &envline[13]; |
14c44e2e UD |
2108 | break; |
2109 | } | |
ea278354 | 2110 | |
67c94753 | 2111 | if (memcmp (envline, "DYNAMIC_WEAK", 12) == 0) |
afdca0f2 | 2112 | GLRO(dl_dynamic_weak) = 1; |
14c44e2e | 2113 | break; |
ea278354 | 2114 | |
97fd3a30 UD |
2115 | case 13: |
2116 | /* We might have some extra environment variable with length 13 | |
2117 | to handle. */ | |
2118 | #ifdef EXTRA_LD_ENVVARS_13 | |
2119 | EXTRA_LD_ENVVARS_13 | |
2120 | #endif | |
2121 | if (!INTUSE(__libc_enable_secure) | |
2122 | && memcmp (envline, "USE_LOAD_BIAS", 13) == 0) | |
afdca0f2 | 2123 | GLRO(dl_use_load_bias) = envline[14] == '1' ? -1 : 0; |
97fd3a30 UD |
2124 | break; |
2125 | ||
14c44e2e UD |
2126 | case 14: |
2127 | /* Where to place the profiling data file. */ | |
e6caf4e1 | 2128 | if (!INTUSE(__libc_enable_secure) |
3e2040c8 UD |
2129 | && memcmp (envline, "PROFILE_OUTPUT", 14) == 0 |
2130 | && envline[15] != '\0') | |
afdca0f2 | 2131 | GLRO(dl_profile_output) = &envline[15]; |
14c44e2e | 2132 | break; |
120b4c49 | 2133 | |
32e6df36 UD |
2134 | case 16: |
2135 | /* The mode of the dynamic linker can be set. */ | |
2136 | if (memcmp (envline, "TRACE_PRELINKING", 16) == 0) | |
2137 | { | |
2138 | mode = trace; | |
afdca0f2 UD |
2139 | GLRO(dl_verbose) = 1; |
2140 | GLRO(dl_debug_mask) |= DL_DEBUG_PRELINK; | |
2141 | GLRO(dl_trace_prelink) = &envline[17]; | |
32e6df36 UD |
2142 | } |
2143 | break; | |
2144 | ||
14c44e2e UD |
2145 | case 20: |
2146 | /* The mode of the dynamic linker can be set. */ | |
67c94753 | 2147 | if (memcmp (envline, "TRACE_LOADED_OBJECTS", 20) == 0) |
14c44e2e UD |
2148 | mode = trace; |
2149 | break; | |
e2102c14 UD |
2150 | |
2151 | /* We might have some extra environment variable to handle. This | |
2152 | is tricky due to the pre-processing of the length of the name | |
2153 | in the switch statement here. The code here assumes that added | |
2154 | environment variables have a different length. */ | |
2155 | #ifdef EXTRA_LD_ENVVARS | |
2156 | EXTRA_LD_ENVVARS | |
2157 | #endif | |
ea278354 UD |
2158 | } |
2159 | } | |
2160 | ||
3e2040c8 UD |
2161 | /* The caller wants this information. */ |
2162 | *modep = mode; | |
2163 | ||
4bae5567 UD |
2164 | /* Extra security for SUID binaries. Remove all dangerous environment |
2165 | variables. */ | |
e6caf4e1 | 2166 | if (__builtin_expect (INTUSE(__libc_enable_secure), 0)) |
4bae5567 | 2167 | { |
c95f3fd4 | 2168 | static const char unsecure_envvars[] = |
4bae5567 UD |
2169 | #ifdef EXTRA_UNSECURE_ENVVARS |
2170 | EXTRA_UNSECURE_ENVVARS | |
2171 | #endif | |
c95f3fd4 UD |
2172 | UNSECURE_ENVVARS; |
2173 | const char *nextp; | |
2174 | ||
2175 | nextp = unsecure_envvars; | |
2176 | do | |
2177 | { | |
2178 | unsetenv (nextp); | |
9710f75d UD |
2179 | /* We could use rawmemchr but this need not be fast. */ |
2180 | nextp = (char *) (strchr) (nextp, '\0') + 1; | |
c95f3fd4 UD |
2181 | } |
2182 | while (*nextp != '\0'); | |
74955460 UD |
2183 | |
2184 | if (__access ("/etc/suid-debug", F_OK) != 0) | |
2185 | unsetenv ("MALLOC_CHECK_"); | |
4bae5567 | 2186 | } |
7dea968e UD |
2187 | /* If we have to run the dynamic linker in debugging mode and the |
2188 | LD_DEBUG_OUTPUT environment variable is given, we write the debug | |
2189 | messages to this file. */ | |
3e2040c8 | 2190 | else if (any_debug && debug_output != NULL) |
7dea968e | 2191 | { |
5f2de337 UD |
2192 | #ifdef O_NOFOLLOW |
2193 | const int flags = O_WRONLY | O_APPEND | O_CREAT | O_NOFOLLOW; | |
2194 | #else | |
2195 | const int flags = O_WRONLY | O_APPEND | O_CREAT; | |
2196 | #endif | |
7a2fd787 UD |
2197 | size_t name_len = strlen (debug_output); |
2198 | char buf[name_len + 12]; | |
2199 | char *startp; | |
2200 | ||
2201 | buf[name_len + 11] = '\0'; | |
9710f75d | 2202 | startp = _itoa (__getpid (), &buf[name_len + 11], 10, 0); |
7a2fd787 UD |
2203 | *--startp = '.'; |
2204 | startp = memcpy (startp - name_len, debug_output, name_len); | |
2205 | ||
dd70526e UD |
2206 | GLRO(dl_debug_fd) = __open (startp, flags, DEFFILEMODE); |
2207 | if (GLRO(dl_debug_fd) == -1) | |
7dea968e | 2208 | /* We use standard output if opening the file failed. */ |
dd70526e | 2209 | GLRO(dl_debug_fd) = STDOUT_FILENO; |
7dea968e | 2210 | } |
ea278354 | 2211 | } |
db276fa1 UD |
2212 | |
2213 | ||
2214 | /* Print the various times we collected. */ | |
2215 | static void | |
392a6b52 | 2216 | print_statistics (hp_timing_t *rtld_total_timep) |
db276fa1 | 2217 | { |
8b07d6a8 | 2218 | #ifndef HP_TIMING_NONAVAIL |
f457369d | 2219 | char buf[200]; |
db276fa1 UD |
2220 | char *cp; |
2221 | char *wp; | |
2222 | ||
2223 | /* Total time rtld used. */ | |
2224 | if (HP_TIMING_AVAIL) | |
2225 | { | |
392a6b52 | 2226 | HP_TIMING_PRINT (buf, sizeof (buf), *rtld_total_timep); |
154d10bd UD |
2227 | _dl_debug_printf ("\nruntime linker statistics:\n" |
2228 | " total startup time in dynamic loader: %s\n", buf); | |
db276fa1 | 2229 | |
392a6b52 | 2230 | /* Print relocation statistics. */ |
35fc382a | 2231 | char pbuf[30]; |
db276fa1 | 2232 | HP_TIMING_PRINT (buf, sizeof (buf), relocate_time); |
392a6b52 | 2233 | cp = _itoa ((1000ULL * relocate_time) / *rtld_total_timep, |
9710f75d | 2234 | pbuf + sizeof (pbuf), 10, 0); |
35fc382a UD |
2235 | wp = pbuf; |
2236 | switch (pbuf + sizeof (pbuf) - cp) | |
db276fa1 UD |
2237 | { |
2238 | case 3: | |
2239 | *wp++ = *cp++; | |
2240 | case 2: | |
2241 | *wp++ = *cp++; | |
2242 | case 1: | |
2243 | *wp++ = '.'; | |
2244 | *wp++ = *cp++; | |
2245 | } | |
2246 | *wp = '\0'; | |
154d10bd UD |
2247 | _dl_debug_printf ("\ |
2248 | time needed for relocation: %s (%s%%)\n", buf, pbuf); | |
db276fa1 | 2249 | } |
1531e094 | 2250 | #endif |
a21a20a3 UD |
2251 | |
2252 | unsigned long int num_relative_relocations = 0; | |
2253 | struct r_scope_elem *scope = &GL(dl_loaded)->l_searchlist; | |
2254 | unsigned int i; | |
2255 | ||
2256 | for (i = 0; i < scope->r_nlist; i++) | |
2257 | { | |
2258 | struct link_map *l = scope->r_list [i]; | |
2259 | ||
2260 | if (!l->l_addr) | |
2261 | continue; | |
2262 | ||
2263 | if (l->l_info[VERSYMIDX (DT_RELCOUNT)]) | |
2264 | num_relative_relocations += l->l_info[VERSYMIDX (DT_RELCOUNT)]->d_un.d_val; | |
2265 | if (l->l_info[VERSYMIDX (DT_RELACOUNT)]) | |
2266 | num_relative_relocations += l->l_info[VERSYMIDX (DT_RELACOUNT)]->d_un.d_val; | |
2267 | } | |
2268 | ||
42af49f8 UD |
2269 | _dl_debug_printf (" number of relocations: %lu\n" |
2270 | " number of relocations from cache: %lu\n" | |
2271 | " number of relative relocations: %lu\n", | |
2272 | GL(dl_num_relocations), | |
2273 | GL(dl_num_cache_relocations), | |
154d10bd | 2274 | num_relative_relocations); |
db276fa1 | 2275 | |
1531e094 | 2276 | #ifndef HP_TIMING_NONAVAIL |
db276fa1 UD |
2277 | /* Time spend while loading the object and the dependencies. */ |
2278 | if (HP_TIMING_AVAIL) | |
2279 | { | |
35fc382a | 2280 | char pbuf[30]; |
db276fa1 | 2281 | HP_TIMING_PRINT (buf, sizeof (buf), load_time); |
392a6b52 | 2282 | cp = _itoa ((1000ULL * load_time) / *rtld_total_timep, |
9710f75d | 2283 | pbuf + sizeof (pbuf), 10, 0); |
35fc382a UD |
2284 | wp = pbuf; |
2285 | switch (pbuf + sizeof (pbuf) - cp) | |
db276fa1 UD |
2286 | { |
2287 | case 3: | |
2288 | *wp++ = *cp++; | |
2289 | case 2: | |
2290 | *wp++ = *cp++; | |
2291 | case 1: | |
2292 | *wp++ = '.'; | |
2293 | *wp++ = *cp++; | |
2294 | } | |
2295 | *wp = '\0'; | |
154d10bd | 2296 | _dl_debug_printf ("\ |
7969407a | 2297 | time needed to load objects: %s (%s%%)\n", |
cff26a3e | 2298 | buf, pbuf); |
db276fa1 | 2299 | } |
1531e094 | 2300 | #endif |
db276fa1 | 2301 | } |