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Revision 1.272 - (show annotations) (download) (as text)
Sun Feb 22 00:54:34 2015 UTC (3 years, 9 months ago) by vapier
Branch: MAIN
Changes since 1.271: +4 -4 lines
File MIME type: text/x-csrc
drop __DATE__ usage as the rcsid provides all the details we care about

1 /*
2 * Copyright 2003-2012 Gentoo Foundation
3 * Distributed under the terms of the GNU General Public License v2
4 * $Header: /var/cvsroot/gentoo-projects/pax-utils/scanelf.c,v 1.271 2015/02/22 00:10:27 vapier Exp $
5 *
6 * Copyright 2003-2012 Ned Ludd - <solar@gentoo.org>
7 * Copyright 2004-2012 Mike Frysinger - <vapier@gentoo.org>
8 */
9
10 static const char rcsid[] = "$Id: scanelf.c,v 1.271 2015/02/22 00:10:27 vapier Exp $";
11 const char argv0[] = "scanelf";
12
13 #include "paxinc.h"
14
15 #define IS_MODIFIER(c) (c == '%' || c == '#' || c == '+')
16
17 /* prototypes */
18 static int file_matches_list(const char *filename, char **matchlist);
19
20 /* variables to control behavior */
21 static array_t _match_etypes = array_init_decl, *match_etypes = &_match_etypes;
22 static array_t _ldpaths = array_init_decl, *ldpaths = &_ldpaths;
23 static char scan_ldpath = 0;
24 static char scan_envpath = 0;
25 static char scan_symlink = 1;
26 static char scan_archives = 0;
27 static char dir_recurse = 0;
28 static char dir_crossmount = 1;
29 static char show_pax = 0;
30 static char show_perms = 0;
31 static char show_size = 0;
32 static char show_phdr = 0;
33 static char show_textrel = 0;
34 static char show_rpath = 0;
35 static char show_needed = 0;
36 static char show_interp = 0;
37 static char show_bind = 0;
38 static char show_soname = 0;
39 static char show_textrels = 0;
40 static char show_banner = 1;
41 static char show_endian = 0;
42 static char show_osabi = 0;
43 static char show_eabi = 0;
44 static char be_quiet = 0;
45 static char be_verbose = 0;
46 static char be_wewy_wewy_quiet = 0;
47 static char be_semi_verbose = 0;
48 static char *find_sym = NULL;
49 static array_t _find_sym_arr = array_init_decl, *find_sym_arr = &_find_sym_arr;
50 static array_t _find_sym_regex_arr = array_init_decl, *find_sym_regex_arr = &_find_sym_regex_arr;
51 static char *find_lib = NULL;
52 static array_t _find_lib_arr = array_init_decl, *find_lib_arr = &_find_lib_arr;
53 static char *find_section = NULL;
54 static array_t _find_section_arr = array_init_decl, *find_section_arr = &_find_section_arr;
55 static char *out_format = NULL;
56 static char *search_path = NULL;
57 static char fix_elf = 0;
58 static char g_match = 0;
59 static char use_ldcache = 0;
60 static char use_ldpath = 0;
61
62 static char **qa_textrels = NULL;
63 static char **qa_execstack = NULL;
64 static char **qa_wx_load = NULL;
65 static int root_fd = AT_FDCWD;
66
67 static int match_bits = 0;
68 static unsigned int match_perms = 0;
69 static void *ldcache = NULL;
70 static size_t ldcache_size = 0;
71 static unsigned long setpax = 0UL;
72
73 static const char *objdump;
74
75 /* Find the path to a file by name. Note: we do not currently handle the
76 * empty path element correctly (should behave by searching $PWD). */
77 static const char *which(const char *fname, const char *envvar)
78 {
79 size_t path_len, fname_len;
80 const char *env_path;
81 char *path, *p, *ep;
82
83 p = getenv(envvar);
84 if (p)
85 return p;
86
87 env_path = getenv("PATH");
88 if (!env_path)
89 return NULL;
90
91 /* Create a copy of the $PATH that we can safely modify.
92 * Make it a little bigger so we can append "/fname".
93 * We do this twice -- once for a perm copy, and once for
94 * room at the end of the last element. */
95 path_len = strlen(env_path);
96 fname_len = strlen(fname);
97 path = xmalloc(path_len + (fname_len * 2) + 2 + 2);
98 memcpy(path, env_path, path_len + 1);
99
100 p = path + path_len + 1 + fname_len + 1;
101 *p = '/';
102 memcpy(p + 1, fname, fname_len + 1);
103
104 /* Repoint fname to the copy in the env string as it has
105 * the leading slash which we can include in a single memcpy.
106 * Increase the fname len to include the '/' and '\0'. */
107 fname = p;
108 fname_len += 2;
109
110 p = path;
111 while (p) {
112 ep = strchr(p, ':');
113 /* Append the /foo path to the current element. */
114 if (ep)
115 memcpy(ep, fname, fname_len);
116 else
117 memcpy(path + path_len, fname, fname_len);
118
119 if (access(p, R_OK) != -1)
120 return p;
121
122 p = ep;
123 if (ep) {
124 /* If not the last element, restore the chunk we clobbered. */
125 size_t offset = ep - path;
126 size_t restore = min(path_len - offset, fname_len);
127 memcpy(ep, env_path + offset, restore);
128 ++p;
129 }
130 }
131
132 free(path);
133 return NULL;
134 }
135
136 static FILE *fopenat_r(int dir_fd, const char *path)
137 {
138 int fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
139 if (fd == -1)
140 return NULL;
141 return fdopen(fd, "re");
142 }
143
144 static const char *root_rel_path(const char *path)
145 {
146 /*
147 * openat() will ignore the dirfd if path starts with
148 * a /, so consume all of that noise
149 *
150 * XXX: we don't handle relative paths like ../ that
151 * break out of the --root option, but for now, just
152 * don't do that :P.
153 */
154 if (root_fd != AT_FDCWD) {
155 while (*path == '/')
156 ++path;
157 if (*path == '\0')
158 path = ".";
159 }
160
161 return path;
162 }
163
164 /* sub-funcs for scanelf_fileat() */
165 static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **str)
166 {
167 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
168
169 /* debug sections */
170 void *symtab = elf_findsecbyname(elf, ".symtab");
171 void *strtab = elf_findsecbyname(elf, ".strtab");
172 /* runtime sections */
173 void *dynsym = elf_findsecbyname(elf, ".dynsym");
174 void *dynstr = elf_findsecbyname(elf, ".dynstr");
175
176 /*
177 * If the sections are marked NOBITS, then they don't exist, so we just
178 * skip them. This let's us work sanely with splitdebug ELFs (rather
179 * than spewing a lot of "corrupt ELF" messages later on). In malformed
180 * ELFs, the section might be wrongly set to NOBITS, but screw em.
181 *
182 * We need to make sure the debug/runtime sym/str sets are used together
183 * as they are generated in sync. Trying to mix them won't work.
184 */
185 #define GET_SYMTABS(B) \
186 if (elf->elf_class == ELFCLASS ## B) { \
187 Elf ## B ## _Shdr *esymtab = symtab; \
188 Elf ## B ## _Shdr *estrtab = strtab; \
189 Elf ## B ## _Shdr *edynsym = dynsym; \
190 Elf ## B ## _Shdr *edynstr = dynstr; \
191 \
192 if (symtab && EGET(esymtab->sh_type) == SHT_NOBITS) \
193 symtab = NULL; \
194 if (dynsym && EGET(edynsym->sh_type) == SHT_NOBITS) \
195 dynsym = NULL; \
196 if (strtab && EGET(estrtab->sh_type) == SHT_NOBITS) \
197 strtab = NULL; \
198 if (dynstr && EGET(edynstr->sh_type) == SHT_NOBITS) \
199 dynstr = NULL; \
200 \
201 /* Use the set with more symbols if both exist. */ \
202 if (symtab && dynsym && strtab && dynstr) { \
203 if (EGET(esymtab->sh_size) > EGET(edynsym->sh_size)) \
204 goto debug##B; \
205 else \
206 goto runtime##B; \
207 } else if (symtab && strtab) { \
208 debug##B: \
209 *sym = symtab; \
210 *str = strtab; \
211 return; \
212 } else if (dynsym && dynstr) { \
213 runtime##B: \
214 *sym = dynsym; \
215 *str = dynstr; \
216 return; \
217 } else { \
218 *sym = *str = NULL; \
219 } \
220 }
221 GET_SYMTABS(32)
222 GET_SYMTABS(64)
223
224 if (*sym && *str)
225 return;
226
227 /*
228 * damn, they're really going to make us work for it huh?
229 * reconstruct the section header info out of the dynamic
230 * tags so we can see what symbols this guy uses at runtime.
231 */
232 #define GET_SYMTABS_DT(B) \
233 if (elf->elf_class == ELFCLASS ## B) { \
234 size_t i; \
235 static Elf ## B ## _Shdr sym_shdr, str_shdr; \
236 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
237 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
238 Elf ## B ## _Addr vsym, vstr, vhash, vgnu_hash; \
239 Elf ## B ## _Dyn *dyn; \
240 Elf ## B ## _Off offset; \
241 \
242 /* lookup symbols used at runtime with DT_SYMTAB / DT_STRTAB */ \
243 vsym = vstr = vhash = vgnu_hash = 0; \
244 memset(&sym_shdr, 0, sizeof(sym_shdr)); \
245 memset(&str_shdr, 0, sizeof(str_shdr)); \
246 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
247 if (EGET(phdr[i].p_type) != PT_DYNAMIC) \
248 continue; \
249 \
250 offset = EGET(phdr[i].p_offset); \
251 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
252 continue; \
253 \
254 dyn = DYN ## B (elf->vdata + offset); \
255 while (EGET(dyn->d_tag) != DT_NULL) { \
256 switch (EGET(dyn->d_tag)) { \
257 case DT_SYMTAB: vsym = EGET(dyn->d_un.d_val); break; \
258 case DT_SYMENT: sym_shdr.sh_entsize = dyn->d_un.d_val; break; \
259 case DT_STRTAB: vstr = EGET(dyn->d_un.d_val); break; \
260 case DT_STRSZ: str_shdr.sh_size = dyn->d_un.d_val; break; \
261 case DT_HASH: vhash = EGET(dyn->d_un.d_val); break; \
262 /*case DT_GNU_HASH: vgnu_hash = EGET(dyn->d_un.d_val); break;*/ \
263 } \
264 ++dyn; \
265 } \
266 if (vsym && vstr) \
267 break; \
268 } \
269 if (!vsym || !vstr || !(vhash || vgnu_hash)) \
270 return; \
271 \
272 /* calc offset into the ELF by finding the load addr of the syms */ \
273 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
274 Elf ## B ## _Addr vaddr = EGET(phdr[i].p_vaddr); \
275 Elf ## B ## _Addr filesz = EGET(phdr[i].p_filesz); \
276 offset = EGET(phdr[i].p_offset); \
277 \
278 if (EGET(phdr[i].p_type) != PT_LOAD) \
279 continue; \
280 \
281 if (vhash >= vaddr && vhash < vaddr + filesz) { \
282 /* Scan the hash table to see how many entries we have */ \
283 Elf32_Word max_sym_idx = 0; \
284 Elf32_Word *hashtbl = elf->vdata + offset + (vhash - vaddr); \
285 Elf32_Word b, nbuckets = EGET(hashtbl[0]); \
286 Elf32_Word nchains = EGET(hashtbl[1]); \
287 Elf32_Word *buckets = &hashtbl[2]; \
288 Elf32_Word *chains = &buckets[nbuckets]; \
289 Elf32_Word sym_idx; \
290 \
291 for (b = 0; b < nbuckets; ++b) { \
292 if (!buckets[b]) \
293 continue; \
294 for (sym_idx = buckets[b]; sym_idx < nchains && sym_idx; sym_idx = chains[sym_idx]) \
295 if (max_sym_idx < sym_idx) \
296 max_sym_idx = sym_idx; \
297 } \
298 ESET(sym_shdr.sh_size, sym_shdr.sh_entsize * max_sym_idx); \
299 } \
300 \
301 if (vsym >= vaddr && vsym < vaddr + filesz) { \
302 ESET(sym_shdr.sh_offset, offset + (vsym - vaddr)); \
303 *sym = &sym_shdr; \
304 } \
305 \
306 if (vstr >= vaddr && vstr < vaddr + filesz) { \
307 ESET(str_shdr.sh_offset, offset + (vstr - vaddr)); \
308 *str = &str_shdr; \
309 } \
310 } \
311 }
312 GET_SYMTABS_DT(32)
313 GET_SYMTABS_DT(64)
314 }
315
316 static char *scanelf_file_pax(elfobj *elf, char *found_pax)
317 {
318 static char ret[7];
319 unsigned long i, shown;
320
321 if (!show_pax) return NULL;
322
323 shown = 0;
324 memset(&ret, 0, sizeof(ret));
325
326 if (elf->phdr) {
327 #define SHOW_PAX(B) \
328 if (elf->elf_class == ELFCLASS ## B) { \
329 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
330 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
331 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
332 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
333 continue; \
334 if (fix_elf && setpax) { \
335 /* set the paxctl flags */ \
336 ESET(phdr[i].p_flags, setpax); \
337 } \
338 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
339 continue; \
340 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
341 *found_pax = 1; \
342 ++shown; \
343 break; \
344 } \
345 }
346 SHOW_PAX(32)
347 SHOW_PAX(64)
348 }
349
350 /* Note: We do not support setting EI_PAX if not PT_PAX_FLAGS
351 * was found. This is known to break ELFs on glibc systems,
352 * and mainline PaX has deprecated use of this for a long time.
353 * We could support changing PT_GNU_STACK, but that doesn't
354 * seem like it's worth the effort. #411919
355 */
356
357 /* fall back to EI_PAX if no PT_PAX was found */
358 if (!*ret) {
359 static char *paxflags;
360 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
361 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
362 *found_pax = 1;
363 return (be_wewy_wewy_quiet ? NULL : paxflags);
364 }
365 strncpy(ret, paxflags, sizeof(ret));
366 }
367
368 if (be_wewy_wewy_quiet || (be_quiet && !shown))
369 return NULL;
370 else
371 return ret;
372 }
373
374 static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
375 {
376 static char ret[12];
377 char *found;
378 unsigned long i, shown, multi_stack, multi_relro, multi_load;
379
380 if (!show_phdr) return NULL;
381
382 memcpy(ret, "--- --- ---\0", 12);
383
384 shown = 0;
385 multi_stack = multi_relro = multi_load = 0;
386
387 #define NOTE_GNU_STACK ".note.GNU-stack"
388 #define SHOW_PHDR(B) \
389 if (elf->elf_class == ELFCLASS ## B) { \
390 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
391 Elf ## B ## _Off offset; \
392 uint32_t flags, check_flags; \
393 if (elf->phdr != NULL) { \
394 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
395 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
396 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
397 if (multi_stack++) \
398 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
399 if (file_matches_list(elf->filename, qa_execstack)) \
400 continue; \
401 found = found_phdr; \
402 offset = 0; \
403 check_flags = PF_X; \
404 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
405 if (multi_relro++) \
406 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
407 found = found_relro; \
408 offset = 4; \
409 check_flags = PF_X; \
410 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
411 if (file_matches_list(elf->filename, qa_wx_load)) \
412 continue; \
413 found = found_load; \
414 offset = 8; \
415 check_flags = PF_W|PF_X; \
416 } else \
417 continue; \
418 flags = EGET(phdr[i].p_flags); \
419 if (be_quiet && ((flags & check_flags) != check_flags)) \
420 continue; \
421 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
422 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
423 ret[3] = ret[7] = '!'; \
424 flags = EGET(phdr[i].p_flags); \
425 } \
426 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
427 *found = 1; \
428 ++shown; \
429 } \
430 } else if (elf->shdr != NULL) { \
431 /* no program headers which means this is prob an object file */ \
432 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
433 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
434 if ((void*)strtbl > elf->data_end) \
435 goto skip_this_shdr##B; \
436 /* let's flag -w/+x object files since the final ELF will most likely \
437 * need write access to the stack (who doesn't !?). so the combined \
438 * output will bring in +w automatically and that's bad. \
439 */ \
440 check_flags = /*SHF_WRITE|*/SHF_EXECINSTR; \
441 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
442 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
443 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
444 if (offset >= elf->len - sizeof(NOTE_GNU_STACK)) \
445 continue; \
446 if (!strcmp(elf->data + offset, NOTE_GNU_STACK)) { \
447 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
448 flags = EGET(shdr[i].sh_flags); \
449 if (be_quiet && ((flags & check_flags) != check_flags)) \
450 continue; \
451 ++*found_phdr; \
452 shown = 1; \
453 if (flags & SHF_WRITE) ret[0] = 'W'; \
454 if (flags & SHF_ALLOC) ret[1] = 'A'; \
455 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
456 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
457 break; \
458 } \
459 } \
460 skip_this_shdr##B: \
461 if (!multi_stack) { \
462 if (file_matches_list(elf->filename, qa_execstack)) \
463 return NULL; \
464 *found_phdr = 1; \
465 shown = 1; \
466 memcpy(ret, "!WX", 3); \
467 } \
468 } \
469 }
470 SHOW_PHDR(32)
471 SHOW_PHDR(64)
472
473 if (be_wewy_wewy_quiet || (be_quiet && !shown))
474 return NULL;
475 else
476 return ret;
477 }
478
479 /*
480 * See if this ELF contains a DT_TEXTREL tag in any of its
481 * PT_DYNAMIC sections.
482 */
483 static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
484 {
485 static const char *ret = "TEXTREL";
486 unsigned long i;
487
488 if (!show_textrel && !show_textrels) return NULL;
489
490 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
491
492 if (elf->phdr) {
493 #define SHOW_TEXTREL(B) \
494 if (elf->elf_class == ELFCLASS ## B) { \
495 Elf ## B ## _Dyn *dyn; \
496 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
497 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
498 Elf ## B ## _Off offset; \
499 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
500 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
501 offset = EGET(phdr[i].p_offset); \
502 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
503 dyn = DYN ## B (elf->vdata + offset); \
504 while (EGET(dyn->d_tag) != DT_NULL) { \
505 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
506 *found_textrel = 1; \
507 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
508 return (be_wewy_wewy_quiet ? NULL : ret); \
509 } \
510 ++dyn; \
511 } \
512 } }
513 SHOW_TEXTREL(32)
514 SHOW_TEXTREL(64)
515 }
516
517 if (be_quiet || be_wewy_wewy_quiet)
518 return NULL;
519 else
520 return " - ";
521 }
522
523 /*
524 * Scan the .text section to see if there are any relocations in it.
525 * Should rewrite this to check PT_LOAD sections that are marked
526 * Executable rather than the section named '.text'.
527 */
528 static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
529 {
530 unsigned long s, r, rmax;
531 void *symtab_void, *strtab_void, *text_void;
532
533 if (!show_textrels) return NULL;
534
535 /* don't search for TEXTREL's if the ELF doesn't have any */
536 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
537 if (!*found_textrel) return NULL;
538
539 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
540 text_void = elf_findsecbyname(elf, ".text");
541
542 if (symtab_void && strtab_void && text_void && elf->shdr) {
543 #define SHOW_TEXTRELS(B) \
544 if (elf->elf_class == ELFCLASS ## B) { \
545 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
546 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
547 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
548 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
549 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
550 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
551 uint ## B ## _t memsz = EGET(text->sh_size); \
552 Elf ## B ## _Rel *rel; \
553 Elf ## B ## _Rela *rela; \
554 /* search the section headers for relocations */ \
555 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
556 uint32_t sh_type = EGET(shdr[s].sh_type); \
557 if (sh_type == SHT_REL) { \
558 rel = REL ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
559 rela = NULL; \
560 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
561 } else if (sh_type == SHT_RELA) { \
562 rel = NULL; \
563 rela = RELA ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
564 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
565 } else \
566 continue; \
567 /* now see if any of the relocs are in the .text */ \
568 for (r = 0; r < rmax; ++r) { \
569 unsigned long sym_max; \
570 Elf ## B ## _Addr offset_tmp; \
571 Elf ## B ## _Sym *func; \
572 Elf ## B ## _Sym *sym; \
573 Elf ## B ## _Addr r_offset; \
574 uint ## B ## _t r_info; \
575 if (sh_type == SHT_REL) { \
576 r_offset = EGET(rel[r].r_offset); \
577 r_info = EGET(rel[r].r_info); \
578 } else { \
579 r_offset = EGET(rela[r].r_offset); \
580 r_info = EGET(rela[r].r_info); \
581 } \
582 /* make sure this relocation is inside of the .text */ \
583 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
584 if (be_verbose <= 2) continue; \
585 } else \
586 *found_textrels = 1; \
587 /* locate this relocation symbol name */ \
588 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
589 if ((void*)sym > elf->data_end) { \
590 warn("%s: corrupt ELF symbol", elf->filename); \
591 continue; \
592 } \
593 sym_max = ELF ## B ## _R_SYM(r_info); \
594 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
595 sym += sym_max; \
596 else \
597 sym = NULL; \
598 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
599 /* show the raw details about this reloc */ \
600 printf(" %s: ", elf->base_filename); \
601 if (sym && sym->st_name) \
602 printf("%s", elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
603 else \
604 printf("(memory/data?)"); \
605 printf(" [0x%lX]", (unsigned long)r_offset); \
606 /* now try to find the closest symbol that this rel is probably in */ \
607 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
608 func = NULL; \
609 offset_tmp = 0; \
610 while (sym_max--) { \
611 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
612 func = sym; \
613 offset_tmp = EGET(sym->st_value); \
614 } \
615 ++sym; \
616 } \
617 printf(" in "); \
618 if (func && func->st_name) { \
619 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
620 if (r_offset > EGET(func->st_size)) \
621 printf("(optimized out: previous %s)", func_name); \
622 else \
623 printf("%s", func_name); \
624 } else \
625 printf("(optimized out)"); \
626 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
627 if (be_verbose && objdump) { \
628 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
629 char *sysbuf; \
630 size_t syslen; \
631 const char sysfmt[] = "%s -r -R -d -w -l --start-address=0x%lX --stop-address=0x%lX %s | grep --color -i -C 3 '.*[[:space:]]%lX:[[:space:]]*R_.*'\n"; \
632 syslen = sizeof(sysfmt) + strlen(objdump) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
633 sysbuf = xmalloc(syslen); \
634 if (end_addr < r_offset) \
635 /* not uncommon when things are optimized out */ \
636 end_addr = r_offset + 0x100; \
637 snprintf(sysbuf, syslen, sysfmt, \
638 objdump, \
639 (unsigned long)offset_tmp, \
640 (unsigned long)end_addr, \
641 elf->filename, \
642 (unsigned long)r_offset); \
643 fflush(stdout); \
644 if (system(sysbuf)) {/* don't care */} \
645 fflush(stdout); \
646 free(sysbuf); \
647 } \
648 } \
649 } }
650 SHOW_TEXTRELS(32)
651 SHOW_TEXTRELS(64)
652 }
653 if (!*found_textrels)
654 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
655
656 return NULL;
657 }
658
659 static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
660 {
661 struct stat st;
662 switch (*item) {
663 case '/': break;
664 case '.':
665 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
666 break;
667 case ':':
668 case '\0':
669 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
670 break;
671 case '$':
672 if (fstat(elf->fd, &st) != -1)
673 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
674 warnf("Security problem with %s='%s' in %s with mode set of %o",
675 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
676 break;
677 default:
678 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
679 break;
680 }
681 if (fix_elf)
682 warnf("Note: RPATH has been automatically fixed, but this should be fixed in the package itself");
683 }
684 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
685 {
686 unsigned long i;
687 char *rpath, *runpath, **r;
688 void *strtbl_void;
689
690 if (!show_rpath) return;
691
692 strtbl_void = elf_findsecbyname(elf, ".dynstr");
693 rpath = runpath = NULL;
694
695 if (elf->phdr && strtbl_void) {
696 #define SHOW_RPATH(B) \
697 if (elf->elf_class == ELFCLASS ## B) { \
698 Elf ## B ## _Dyn *dyn; \
699 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
700 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
701 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
702 Elf ## B ## _Off offset; \
703 Elf ## B ## _Xword word; \
704 /* Scan all the program headers */ \
705 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
706 /* Just scan dynamic headers */ \
707 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
708 offset = EGET(phdr[i].p_offset); \
709 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
710 /* Just scan dynamic RPATH/RUNPATH headers */ \
711 dyn = DYN ## B (elf->vdata + offset); \
712 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
713 if (word == DT_RPATH) { \
714 r = &rpath; \
715 } else if (word == DT_RUNPATH) { \
716 r = &runpath; \
717 } else { \
718 ++dyn; \
719 continue; \
720 } \
721 /* Verify the memory is somewhat sane */ \
722 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
723 if (offset < (Elf ## B ## _Off)elf->len) { \
724 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
725 *r = elf->data + offset; \
726 /* cache the length in case we need to nuke this section later on */ \
727 if (fix_elf) \
728 offset = strlen(*r); \
729 /* If quiet, don't output paths in ld.so.conf */ \
730 if (be_quiet) { \
731 size_t len; \
732 char *start, *end; \
733 /* note that we only 'chop' off leading known paths. */ \
734 /* since *r is read-only memory, we can only move the ptr forward. */ \
735 start = *r; \
736 /* scan each path in : delimited list */ \
737 while (start) { \
738 rpath_security_checks(elf, start, get_elfdtype(word)); \
739 end = strchr(start, ':'); \
740 len = (end ? abs(end - start) : strlen(start)); \
741 if (use_ldcache) { \
742 size_t n; \
743 const char *ldpath; \
744 array_for_each(ldpaths, n, ldpath) \
745 if (!strncmp(ldpath, start, len) && !ldpath[len]) { \
746 *r = end; \
747 /* corner case ... if RPATH reads "/usr/lib:", we want \
748 * to show ':' rather than '' */ \
749 if (end && end[1] != '\0') \
750 (*r)++; \
751 break; \
752 } \
753 } \
754 if (!*r || !end) \
755 break; \
756 else \
757 start = start + len + 1; \
758 } \
759 } \
760 if (*r) { \
761 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
762 /* just nuke it */ \
763 nuke_it##B: \
764 memset(*r, 0x00, offset); \
765 *r = NULL; \
766 ESET(dyn->d_tag, DT_DEBUG); \
767 ESET(dyn->d_un.d_ptr, 0); \
768 } else if (fix_elf) { \
769 /* try to clean "bad" paths */ \
770 size_t len, tmpdir_len; \
771 char *start, *end; \
772 const char *tmpdir; \
773 start = *r; \
774 tmpdir = (getenv("TMPDIR") ? : "."); \
775 tmpdir_len = strlen(tmpdir); \
776 while (1) { \
777 end = strchr(start, ':'); \
778 if (start == end) { \
779 eat_this_path##B: \
780 len = strlen(end); \
781 memmove(start, end+1, len); \
782 start[len-1] = '\0'; \
783 end = start - 1; \
784 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
785 if (!end) { \
786 if (start == *r) \
787 goto nuke_it##B; \
788 *--start = '\0'; \
789 } else \
790 goto eat_this_path##B; \
791 } \
792 if (!end) \
793 break; \
794 start = end + 1; \
795 } \
796 if (**r == '\0') \
797 goto nuke_it##B; \
798 } \
799 if (*r) \
800 *found_rpath = 1; \
801 } \
802 } \
803 ++dyn; \
804 } \
805 } }
806 SHOW_RPATH(32)
807 SHOW_RPATH(64)
808 }
809
810 if (be_wewy_wewy_quiet) return;
811
812 if (rpath && runpath) {
813 if (!strcmp(rpath, runpath)) {
814 xstrcat(ret, runpath, ret_len);
815 } else {
816 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
817 xchrcat(ret, '{', ret_len);
818 xstrcat(ret, rpath, ret_len);
819 xchrcat(ret, ',', ret_len);
820 xstrcat(ret, runpath, ret_len);
821 xchrcat(ret, '}', ret_len);
822 }
823 } else if (rpath || runpath)
824 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
825 else if (!be_quiet)
826 xstrcat(ret, " - ", ret_len);
827 }
828
829 /* Defines can be seen in glibc's sysdeps/generic/ldconfig.h */
830 #define LDSO_CACHE_MAGIC "ld.so-"
831 #define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
832 #define LDSO_CACHE_VER "1.7.0"
833 #define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
834 #define FLAG_ANY -1
835 #define FLAG_TYPE_MASK 0x00ff
836 #define FLAG_LIBC4 0x0000
837 #define FLAG_ELF 0x0001
838 #define FLAG_ELF_LIBC5 0x0002
839 #define FLAG_ELF_LIBC6 0x0003
840 #define FLAG_REQUIRED_MASK 0xff00
841 #define FLAG_SPARC_LIB64 0x0100
842 #define FLAG_IA64_LIB64 0x0200
843 #define FLAG_X8664_LIB64 0x0300
844 #define FLAG_S390_LIB64 0x0400
845 #define FLAG_POWERPC_LIB64 0x0500
846 #define FLAG_MIPS64_LIBN32 0x0600
847 #define FLAG_MIPS64_LIBN64 0x0700
848 #define FLAG_X8664_LIBX32 0x0800
849 #define FLAG_ARM_LIBHF 0x0900
850 #define FLAG_AARCH64_LIB64 0x0a00
851
852 #if defined(__GLIBC__) || defined(__UCLIBC__)
853
854 static char *lookup_cache_lib(elfobj *elf, const char *fname)
855 {
856 int fd;
857 char *strs;
858 static char buf[__PAX_UTILS_PATH_MAX] = "";
859 const char *cachefile = root_rel_path("/etc/ld.so.cache");
860 struct stat st;
861
862 typedef struct {
863 char magic[LDSO_CACHE_MAGIC_LEN];
864 char version[LDSO_CACHE_VER_LEN];
865 int nlibs;
866 } header_t;
867 header_t *header;
868
869 typedef struct {
870 int flags;
871 int sooffset;
872 int liboffset;
873 } libentry_t;
874 libentry_t *libent;
875
876 if (fname == NULL)
877 return NULL;
878
879 if (ldcache == NULL) {
880 if (fstatat(root_fd, cachefile, &st, 0))
881 return NULL;
882
883 fd = openat(root_fd, cachefile, O_RDONLY);
884 if (fd == -1)
885 return NULL;
886
887 /* cache these values so we only map/unmap the cache file once */
888 ldcache_size = st.st_size;
889 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
890 close(fd);
891
892 if (ldcache == MAP_FAILED) {
893 ldcache = NULL;
894 return NULL;
895 }
896
897 if (memcmp(header->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN) ||
898 memcmp(header->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
899 {
900 munmap(ldcache, ldcache_size);
901 ldcache = NULL;
902 return NULL;
903 }
904 } else
905 header = ldcache;
906
907 libent = ldcache + sizeof(header_t);
908 strs = (char *) &libent[header->nlibs];
909
910 for (fd = 0; fd < header->nlibs; ++fd) {
911 /* This should be more fine grained, but for now we assume that
912 * diff arches will not be cached together, and we ignore the
913 * the different multilib mips cases.
914 */
915 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
916 continue;
917 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
918 continue;
919
920 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
921 continue;
922
923 /* Return first hit because that is how the ldso rolls */
924 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
925 break;
926 }
927
928 return buf;
929 }
930
931 #elif defined(__NetBSD__)
932 static char *lookup_cache_lib(elfobj *elf, const char *fname)
933 {
934 static char buf[__PAX_UTILS_PATH_MAX] = "";
935 static struct stat st;
936 size_t n;
937 char *ldpath;
938
939 array_for_each(ldpath, n, ldpath) {
940 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", ldpath, fname) >= sizeof(buf))
941 continue; /* if the pathname is too long, or something went wrong, ignore */
942
943 if (stat(buf, &st) != 0)
944 continue; /* if the lib doesn't exist in *ldpath, look further */
945
946 /* NetBSD doesn't actually do sanity checks, it just loads the file
947 * and if that doesn't work, continues looking in other directories.
948 * This cannot easily be safely emulated, unfortunately. For now,
949 * just assume that if it exists, it's a valid library. */
950
951 return buf;
952 }
953
954 /* not found in any path */
955 return NULL;
956 }
957 #else
958 #ifdef __ELF__
959 #warning Cache support not implemented for your target
960 #endif
961 static char *lookup_cache_lib(elfobj *elf, const char *fname)
962 {
963 return NULL;
964 }
965 #endif
966
967 static char *lookup_config_lib(const char *fname)
968 {
969 static char buf[__PAX_UTILS_PATH_MAX] = "";
970 const char *ldpath;
971 size_t n;
972
973 array_for_each(ldpaths, n, ldpath) {
974 snprintf(buf, sizeof(buf), "%s/%s", root_rel_path(ldpath), fname);
975 if (faccessat(root_fd, buf, F_OK, AT_SYMLINK_NOFOLLOW) == 0)
976 return buf;
977 }
978
979 return NULL;
980 }
981
982 static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
983 {
984 unsigned long i;
985 char *needed;
986 void *strtbl_void;
987 char *p;
988
989 /*
990 * -n -> op==0 -> print all
991 * -N -> op==1 -> print requested
992 */
993 if ((op == 0 && !show_needed) || (op == 1 && !find_lib))
994 return NULL;
995
996 strtbl_void = elf_findsecbyname(elf, ".dynstr");
997
998 if (elf->phdr && strtbl_void) {
999 #define SHOW_NEEDED(B) \
1000 if (elf->elf_class == ELFCLASS ## B) { \
1001 Elf ## B ## _Dyn *dyn; \
1002 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1003 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1004 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
1005 Elf ## B ## _Off offset; \
1006 size_t matched = 0; \
1007 /* Walk all the program headers to find the PT_DYNAMIC */ \
1008 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1009 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) \
1010 continue; \
1011 offset = EGET(phdr[i].p_offset); \
1012 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
1013 continue; \
1014 /* Walk all the dynamic tags to find NEEDED entries */ \
1015 dyn = DYN ## B (elf->vdata + offset); \
1016 while (EGET(dyn->d_tag) != DT_NULL) { \
1017 if (EGET(dyn->d_tag) == DT_NEEDED) { \
1018 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
1019 if (offset >= (Elf ## B ## _Off)elf->len) { \
1020 ++dyn; \
1021 continue; \
1022 } \
1023 needed = elf->data + offset; \
1024 if (op == 0) { \
1025 /* -n -> print all entries */ \
1026 if (!be_wewy_wewy_quiet) { \
1027 if (*found_needed) xchrcat(ret, ',', ret_len); \
1028 if (use_ldpath) { \
1029 if ((p = lookup_config_lib(needed)) != NULL) \
1030 needed = p; \
1031 } else if (use_ldcache) { \
1032 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
1033 needed = p; \
1034 } \
1035 xstrcat(ret, needed, ret_len); \
1036 } \
1037 *found_needed = 1; \
1038 } else { \
1039 /* -N -> print matching entries */ \
1040 size_t n; \
1041 const char *find_lib_name; \
1042 \
1043 array_for_each(find_lib_arr, n, find_lib_name) { \
1044 int invert = 1; \
1045 if (find_lib_name[0] == '!') \
1046 invert = 0, ++find_lib_name; \
1047 if (!strcmp(find_lib_name, needed) == invert) \
1048 ++matched; \
1049 } \
1050 \
1051 if (matched == array_cnt(find_lib_arr)) { \
1052 *found_lib = 1; \
1053 return (be_wewy_wewy_quiet ? NULL : find_lib); \
1054 } \
1055 } \
1056 } \
1057 ++dyn; \
1058 } \
1059 } }
1060 SHOW_NEEDED(32)
1061 SHOW_NEEDED(64)
1062 if (op == 0 && !*found_needed && be_verbose)
1063 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
1064 }
1065
1066 return NULL;
1067 }
1068 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
1069 {
1070 void *strtbl_void;
1071
1072 if (!show_interp) return NULL;
1073
1074 strtbl_void = elf_findsecbyname(elf, ".interp");
1075
1076 if (strtbl_void) {
1077 #define SHOW_INTERP(B) \
1078 if (elf->elf_class == ELFCLASS ## B) { \
1079 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
1080 *found_interp = 1; \
1081 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
1082 }
1083 SHOW_INTERP(32)
1084 SHOW_INTERP(64)
1085 } else {
1086 /* Walk all the program headers to find the PT_INTERP */
1087 #define SHOW_PT_INTERP(B) \
1088 if (elf->elf_class == ELFCLASS ## B) { \
1089 unsigned long i; \
1090 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1091 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1092 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1093 if (EGET(phdr[i].p_type) != PT_INTERP) \
1094 continue; \
1095 *found_interp = 1; \
1096 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(phdr[i].p_offset)); \
1097 } \
1098 }
1099 SHOW_PT_INTERP(32)
1100 SHOW_PT_INTERP(64)
1101 }
1102
1103 return NULL;
1104 }
1105 static const char *scanelf_file_bind(elfobj *elf, char *found_bind)
1106 {
1107 unsigned long i;
1108 struct stat s;
1109 bool dynamic = false;
1110
1111 if (!show_bind) return NULL;
1112 if (!elf->phdr) return NULL;
1113
1114 #define SHOW_BIND(B) \
1115 if (elf->elf_class == ELFCLASS ## B) { \
1116 Elf ## B ## _Dyn *dyn; \
1117 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1118 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1119 Elf ## B ## _Off offset; \
1120 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1121 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1122 dynamic = true; \
1123 offset = EGET(phdr[i].p_offset); \
1124 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
1125 dyn = DYN ## B (elf->vdata + offset); \
1126 while (EGET(dyn->d_tag) != DT_NULL) { \
1127 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
1128 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
1129 { \
1130 if (be_quiet) return NULL; \
1131 *found_bind = 1; \
1132 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
1133 } \
1134 ++dyn; \
1135 } \
1136 } \
1137 }
1138 SHOW_BIND(32)
1139 SHOW_BIND(64)
1140
1141 if (be_wewy_wewy_quiet) return NULL;
1142
1143 /* don't output anything if quiet mode and the ELF is static or not setuid */
1144 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
1145 return NULL;
1146 } else {
1147 *found_bind = 1;
1148 return dynamic ? "LAZY" : "STATIC";
1149 }
1150 }
1151 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
1152 {
1153 unsigned long i;
1154 char *soname;
1155 void *strtbl_void;
1156
1157 if (!show_soname) return NULL;
1158
1159 strtbl_void = elf_findsecbyname(elf, ".dynstr");
1160
1161 if (elf->phdr && strtbl_void) {
1162 #define SHOW_SONAME(B) \
1163 if (elf->elf_class == ELFCLASS ## B) { \
1164 Elf ## B ## _Dyn *dyn; \
1165 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1166 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1167 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
1168 Elf ## B ## _Off offset; \
1169 /* only look for soname in shared objects */ \
1170 if (EGET(ehdr->e_type) != ET_DYN) \
1171 return NULL; \
1172 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1173 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1174 offset = EGET(phdr[i].p_offset); \
1175 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
1176 dyn = DYN ## B (elf->vdata + offset); \
1177 while (EGET(dyn->d_tag) != DT_NULL) { \
1178 if (EGET(dyn->d_tag) == DT_SONAME) { \
1179 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
1180 if (offset >= (Elf ## B ## _Off)elf->len) { \
1181 ++dyn; \
1182 continue; \
1183 } \
1184 soname = elf->data + offset; \
1185 *found_soname = 1; \
1186 return (be_wewy_wewy_quiet ? NULL : soname); \
1187 } \
1188 ++dyn; \
1189 } \
1190 } }
1191 SHOW_SONAME(32)
1192 SHOW_SONAME(64)
1193 }
1194
1195 return NULL;
1196 }
1197
1198 /*
1199 * We support the symbol form:
1200 * [%[modifiers]%][[+-]<symbol name>][,[.....]]
1201 * If the symbol name is empty, then all symbols are matched.
1202 * If the symbol name is a glob ("*"), then all symbols are dumped (debug).
1203 * Do not rely on this output format at all.
1204 * Otherwise the symbol name is used to search (either regex or string compare).
1205 * If the first char of the symbol name is a plus ("+"), then only match
1206 * defined symbols. If it's a minus ("-"), only match undefined symbols.
1207 * Putting modifiers in between the percent signs allows for more in depth
1208 * filters. There are groups of modifiers. If you don't specify a member
1209 * of a group, then all types in that group are matched. The current
1210 * groups and their types are:
1211 * STT group: STT_NOTYPE:n STT_OBJECT:o STT_FUNC:f STT_FILE:F
1212 * STB group: STB_LOCAL:l STB_GLOBAL:g STB_WEAK:w
1213 * STV group: STV_DEFAULT:p STV_INTERNAL:i STV_HIDDEN:h STV_PROTECTED:P
1214 * SHN group: SHN_UNDEF:u SHN_ABS:a SHN_COMMON:c {defined}:d
1215 * The "defined" value in the SHN group does not correspond to a SHN_xxx define.
1216 * You can search for multiple symbols at once by seperating with a comma (",").
1217 *
1218 * Some examples:
1219 * ELFs with a weak function "foo":
1220 * scanelf -s %wf%foo <ELFs>
1221 * ELFs that define the symbol "main":
1222 * scanelf -s +main <ELFs>
1223 * scanelf -s %d%main <ELFs>
1224 * ELFs that refer to the undefined symbol "brk":
1225 * scanelf -s -brk <ELFs>
1226 * scanelf -s %u%brk <ELFs>
1227 * All global defined objects in an ELF:
1228 * scanelf -s %ogd% <ELF>
1229 */
1230 static void
1231 scanelf_match_symname(elfobj *elf, char *found_sym, char **ret, size_t *ret_len, const char *symname,
1232 unsigned int stt, unsigned int stb, unsigned int stv, unsigned int shn, unsigned long size)
1233 {
1234 const char *this_sym;
1235 size_t n;
1236
1237 array_for_each(find_sym_arr, n, this_sym) {
1238 bool inc_notype, inc_object, inc_func, inc_file,
1239 inc_local, inc_global, inc_weak,
1240 inc_visdef, inc_intern, inc_hidden, inc_prot,
1241 inc_def, inc_undef, inc_abs, inc_common;
1242
1243 /* symbol selection! */
1244 inc_notype = inc_object = inc_func = inc_file =
1245 inc_local = inc_global = inc_weak =
1246 inc_visdef = inc_intern = inc_hidden = inc_prot =
1247 inc_def = inc_undef = inc_abs = inc_common =
1248 (*this_sym != '%');
1249
1250 /* parse the contents of %...% */
1251 if (!inc_notype) {
1252 while (*(this_sym++)) {
1253 if (*this_sym == '%') {
1254 ++this_sym;
1255 break;
1256 }
1257 switch (*this_sym) {
1258 case 'n': inc_notype = true; break;
1259 case 'o': inc_object = true; break;
1260 case 'f': inc_func = true; break;
1261 case 'F': inc_file = true; break;
1262 case 'l': inc_local = true; break;
1263 case 'g': inc_global = true; break;
1264 case 'w': inc_weak = true; break;
1265 case 'p': inc_visdef = true; break;
1266 case 'i': inc_intern = true; break;
1267 case 'h': inc_hidden = true; break;
1268 case 'P': inc_prot = true; break;
1269 case 'd': inc_def = true; break;
1270 case 'u': inc_undef = true; break;
1271 case 'a': inc_abs = true; break;
1272 case 'c': inc_common = true; break;
1273 default: err("invalid symbol selector '%c'", *this_sym);
1274 }
1275 }
1276
1277 /* If no types are matched, not match all */
1278 if (!inc_notype && !inc_object && !inc_func && !inc_file)
1279 inc_notype = inc_object = inc_func = inc_file = true;
1280 if (!inc_local && !inc_global && !inc_weak)
1281 inc_local = inc_global = inc_weak = true;
1282 if (!inc_visdef && !inc_intern && !inc_hidden && !inc_prot)
1283 inc_visdef = inc_intern = inc_hidden = inc_prot = true;
1284 if (!inc_def && !inc_undef && !inc_abs && !inc_common)
1285 inc_def = inc_undef = inc_abs = inc_common = true;
1286
1287 /* backwards compat for defined/undefined short hand */
1288 } else if (*this_sym == '+') {
1289 inc_undef = false;
1290 ++this_sym;
1291 } else if (*this_sym == '-') {
1292 inc_def = inc_abs = inc_common = false;
1293 ++this_sym;
1294 }
1295
1296 /* filter symbols */
1297 if ((!inc_notype && stt == STT_NOTYPE ) || \
1298 (!inc_object && stt == STT_OBJECT ) || \
1299 (!inc_func && stt == STT_FUNC ) || \
1300 (!inc_file && stt == STT_FILE ) || \
1301 (!inc_local && stb == STB_LOCAL ) || \
1302 (!inc_global && stb == STB_GLOBAL ) || \
1303 (!inc_weak && stb == STB_WEAK ) || \
1304 (!inc_visdef && stv == STV_DEFAULT ) || \
1305 (!inc_intern && stv == STV_INTERNAL ) || \
1306 (!inc_hidden && stv == STV_HIDDEN ) || \
1307 (!inc_prot && stv == STV_PROTECTED) || \
1308 (!inc_def && shn && shn < SHN_LORESERVE) || \
1309 (!inc_undef && shn == SHN_UNDEF ) || \
1310 (!inc_abs && shn == SHN_ABS ) || \
1311 (!inc_common && shn == SHN_COMMON ))
1312 continue;
1313
1314 if (*this_sym == '*') {
1315 /* a "*" symbol gets you debug output */
1316 printf("%s(%s) %5lX %-15s %-15s %-15s %-15s %s\n",
1317 ((*found_sym == 0) ? "\n\t" : "\t"),
1318 elf->base_filename,
1319 size,
1320 get_elfstttype(stt),
1321 get_elfstbtype(stb),
1322 get_elfstvtype(stv),
1323 get_elfshntype(shn),
1324 symname);
1325 goto matched;
1326
1327 } else {
1328 if (g_match) {
1329 /* regex match the symbol */
1330 if (regexec(find_sym_regex_arr->eles[n], symname, 0, NULL, 0) == REG_NOMATCH)
1331 continue;
1332
1333 } else if (*this_sym) {
1334 /* give empty symbols a "pass", else do a normal compare */
1335 const size_t len = strlen(this_sym);
1336 if (!(strncmp(this_sym, symname, len) == 0 &&
1337 /* Accept unversioned symbol names */
1338 (symname[len] == '\0' || symname[len] == '@')))
1339 continue;
1340 }
1341
1342 if (be_semi_verbose) {
1343 char buf[1024];
1344 snprintf(buf, sizeof(buf), "%lX %s %s",
1345 size,
1346 get_elfstttype(stt),
1347 this_sym);
1348 *ret = xstrdup(buf);
1349 } else {
1350 if (*ret) xchrcat(ret, ',', ret_len);
1351 xstrcat(ret, symname, ret_len);
1352 }
1353
1354 goto matched;
1355 }
1356 }
1357
1358 return;
1359
1360 matched:
1361 *found_sym = 1;
1362 }
1363
1364 static const char *scanelf_file_sym(elfobj *elf, char *found_sym)
1365 {
1366 char *ret;
1367 void *symtab_void, *strtab_void;
1368
1369 if (!find_sym) return NULL;
1370 ret = NULL;
1371
1372 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
1373
1374 if (symtab_void && strtab_void) {
1375 #define FIND_SYM(B) \
1376 if (elf->elf_class == ELFCLASS ## B) { \
1377 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
1378 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
1379 Elf ## B ## _Sym *sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
1380 Elf ## B ## _Word i, cnt = EGET(symtab->sh_entsize); \
1381 char *symname; \
1382 size_t ret_len = 0; \
1383 if (cnt) \
1384 cnt = EGET(symtab->sh_size) / cnt; \
1385 for (i = 0; i < cnt; ++i) { \
1386 if ((void*)sym > elf->data_end) { \
1387 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1388 goto break_out; \
1389 } \
1390 if (sym->st_name) { \
1391 /* make sure the symbol name is in acceptable memory range */ \
1392 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
1393 if ((void*)symname > elf->data_end) { \
1394 warnf("%s: corrupt ELF symbols", elf->filename); \
1395 ++sym; \
1396 continue; \
1397 } \
1398 scanelf_match_symname(elf, found_sym, \
1399 &ret, &ret_len, symname, \
1400 ELF##B##_ST_TYPE(EGET(sym->st_info)), \
1401 ELF##B##_ST_BIND(EGET(sym->st_info)), \
1402 ELF##B##_ST_VISIBILITY(EGET(sym->st_other)), \
1403 EGET(sym->st_shndx), \
1404 /* st_size can be 64bit, but no one is really that big, so screw em */ \
1405 EGET(sym->st_size)); \
1406 } \
1407 ++sym; \
1408 } \
1409 }
1410 FIND_SYM(32)
1411 FIND_SYM(64)
1412 }
1413
1414 break_out:
1415 if (be_wewy_wewy_quiet) return NULL;
1416
1417 if (*find_sym != '*' && *found_sym)
1418 return ret;
1419 if (be_quiet)
1420 return NULL;
1421 else
1422 return " - ";
1423 }
1424
1425 static const char *scanelf_file_sections(elfobj *elf, char *found_section)
1426 {
1427 if (!find_section)
1428 return NULL;
1429
1430 #define FIND_SECTION(B) \
1431 if (elf->elf_class == ELFCLASS ## B) { \
1432 size_t matched, n; \
1433 int invert; \
1434 const char *section_name; \
1435 Elf ## B ## _Shdr *section; \
1436 \
1437 matched = 0; \
1438 array_for_each(find_section_arr, n, section_name) { \
1439 invert = (*section_name == '!' ? 1 : 0); \
1440 section = SHDR ## B (elf_findsecbyname(elf, section_name + invert)); \
1441 if ((section == NULL && invert) || (section != NULL && !invert)) \
1442 ++matched; \
1443 } \
1444 \
1445 if (matched == array_cnt(find_section_arr)) \
1446 *found_section = 1; \
1447 }
1448 FIND_SECTION(32)
1449 FIND_SECTION(64)
1450
1451 if (be_wewy_wewy_quiet)
1452 return NULL;
1453
1454 if (*found_section)
1455 return find_section;
1456
1457 if (be_quiet)
1458 return NULL;
1459 else
1460 return " - ";
1461 }
1462
1463 /* scan an elf file and show all the fun stuff */
1464 #define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
1465 static int scanelf_elfobj(elfobj *elf)
1466 {
1467 unsigned long i;
1468 char found_pax, found_phdr, found_relro, found_load, found_textrel,
1469 found_rpath, found_needed, found_interp, found_bind, found_soname,
1470 found_sym, found_lib, found_file, found_textrels, found_section;
1471 static char *out_buffer = NULL;
1472 static size_t out_len;
1473
1474 found_pax = found_phdr = found_relro = found_load = found_textrel = \
1475 found_rpath = found_needed = found_interp = found_bind = found_soname = \
1476 found_sym = found_lib = found_file = found_textrels = found_section = 0;
1477
1478 if (be_verbose > 2)
1479 printf("%s: scanning file {%s,%s}\n", elf->filename,
1480 get_elfeitype(EI_CLASS, elf->elf_class),
1481 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
1482 else if (be_verbose > 1)
1483 printf("%s: scanning file\n", elf->filename);
1484
1485 /* init output buffer */
1486 if (!out_buffer) {
1487 out_len = sizeof(char) * 80;
1488 out_buffer = xmalloc(out_len);
1489 }
1490 *out_buffer = '\0';
1491
1492 /* show the header */
1493 if (!be_quiet && show_banner) {
1494 for (i = 0; out_format[i]; ++i) {
1495 if (!IS_MODIFIER(out_format[i])) continue;
1496
1497 switch (out_format[++i]) {
1498 case '+': break;
1499 case '%': break;
1500 case '#': break;
1501 case 'F':
1502 case 'p':
1503 case 'f': prints("FILE "); found_file = 1; break;
1504 case 'o': prints(" TYPE "); break;
1505 case 'x': prints(" PAX "); break;
1506 case 'e': prints("STK/REL/PTL "); break;
1507 case 't': prints("TEXTREL "); break;
1508 case 'r': prints("RPATH "); break;
1509 case 'M': prints("CLASS "); break;
1510 case 'l':
1511 case 'n': prints("NEEDED "); break;
1512 case 'i': prints("INTERP "); break;
1513 case 'b': prints("BIND "); break;
1514 case 'Z': prints("SIZE "); break;
1515 case 'S': prints("SONAME "); break;
1516 case 's': prints("SYM "); break;
1517 case 'N': prints("LIB "); break;
1518 case 'T': prints("TEXTRELS "); break;
1519 case 'k': prints("SECTION "); break;
1520 case 'a': prints("ARCH "); break;
1521 case 'I': prints("OSABI "); break;
1522 case 'Y': prints("EABI "); break;
1523 case 'O': prints("PERM "); break;
1524 case 'D': prints("ENDIAN "); break;
1525 default: warnf("'%c' has no title ?", out_format[i]);
1526 }
1527 }
1528 if (!found_file) prints("FILE ");
1529 prints("\n");
1530 found_file = 0;
1531 show_banner = 0;
1532 }
1533
1534 /* dump all the good stuff */
1535 for (i = 0; out_format[i]; ++i) {
1536 const char *out;
1537 const char *tmp;
1538 static char ubuf[sizeof(unsigned long)*2];
1539 if (!IS_MODIFIER(out_format[i])) {
1540 xchrcat(&out_buffer, out_format[i], &out_len);
1541 continue;
1542 }
1543
1544 out = NULL;
1545 be_wewy_wewy_quiet = (out_format[i] == '#');
1546 be_semi_verbose = (out_format[i] == '+');
1547 switch (out_format[++i]) {
1548 case '+':
1549 case '%':
1550 case '#':
1551 xchrcat(&out_buffer, out_format[i], &out_len); break;
1552 case 'F':
1553 found_file = 1;
1554 if (be_wewy_wewy_quiet) break;
1555 xstrcat(&out_buffer, elf->filename, &out_len);
1556 break;
1557 case 'p':
1558 found_file = 1;
1559 if (be_wewy_wewy_quiet) break;
1560 tmp = elf->filename;
1561 if (search_path) {
1562 ssize_t len_search = strlen(search_path);
1563 ssize_t len_file = strlen(elf->filename);
1564 if (!strncmp(elf->filename, search_path, len_search) && \
1565 len_file > len_search)
1566 tmp += len_search;
1567 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1568 }
1569 xstrcat(&out_buffer, tmp, &out_len);
1570 break;
1571 case 'f':
1572 found_file = 1;
1573 if (be_wewy_wewy_quiet) break;
1574 tmp = strrchr(elf->filename, '/');
1575 tmp = (tmp == NULL ? elf->filename : tmp+1);
1576 xstrcat(&out_buffer, tmp, &out_len);
1577 break;
1578 case 'o': out = get_elfetype(elf); break;
1579 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
1580 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
1581 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1582 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
1583 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1584 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1585 case 'D': out = get_endian(elf); break;
1586 case 'O': out = strfileperms(elf->filename); break;
1587 case 'n':
1588 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
1589 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1590 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1591 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
1592 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1593 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1594 case 'a': out = get_elfemtype(elf); break;
1595 case 'I': out = get_elfosabi(elf); break;
1596 case 'Y': out = get_elf_eabi(elf); break;
1597 case 'Z': snprintf(ubuf, sizeof(ubuf), "%lu", (unsigned long)elf->len); out = ubuf; break;;
1598 default: warnf("'%c' has no scan code?", out_format[i]);
1599 }
1600 if (out)
1601 xstrcat(&out_buffer, out, &out_len);
1602 }
1603
1604 #define FOUND_SOMETHING() \
1605 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1606 found_rpath || found_needed || found_interp || found_bind || \
1607 found_soname || found_sym || found_lib || found_textrels || found_section )
1608
1609 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1610 xchrcat(&out_buffer, ' ', &out_len);
1611 xstrcat(&out_buffer, elf->filename, &out_len);
1612 }
1613 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
1614 puts(out_buffer);
1615 fflush(stdout);
1616 }
1617
1618 return 0;
1619 }
1620
1621 /* scan a single elf */
1622 static int scanelf_elf(const char *filename, int fd, size_t len)
1623 {
1624 int ret = 1;
1625 size_t n;
1626 const char *match_etype;
1627 elfobj *elf;
1628
1629 /* Verify this is a real ELF */
1630 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1631 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1632 return 2;
1633 }
1634
1635 /* Possibly filter based on ELF bitness */
1636 switch (match_bits) {
1637 case 32:
1638 if (elf->elf_class != ELFCLASS32)
1639 goto done;
1640 break;
1641 case 64:
1642 if (elf->elf_class != ELFCLASS64)
1643 goto done;
1644 break;
1645 }
1646
1647 /* Possibly filter based on the ELF's e_type field */
1648 array_for_each(match_etypes, n, match_etype)
1649 if (etype_lookup(match_etype) == get_etype(elf))
1650 goto scanit;
1651 if (array_cnt(match_etypes))
1652 goto done;
1653
1654 scanit:
1655 ret = scanelf_elfobj(elf);
1656
1657 done:
1658 unreadelf(elf);
1659 return ret;
1660 }
1661
1662 /* scan an archive of elfs */
1663 static int scanelf_archive(const char *filename, int fd, size_t len)
1664 {
1665 archive_handle *ar;
1666 archive_member *m;
1667 char *ar_buffer;
1668 elfobj *elf;
1669
1670 ar = ar_open_fd(filename, fd);
1671 if (ar == NULL)
1672 return 1;
1673
1674 ar_buffer = mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1675 while ((m = ar_next(ar)) != NULL) {
1676 off_t cur_pos = lseek(fd, 0, SEEK_CUR);
1677 if (cur_pos == -1)
1678 errp("lseek() failed");
1679 elf = readelf_buffer(m->name, ar_buffer + cur_pos, m->size);
1680 if (elf) {
1681 scanelf_elfobj(elf);
1682 unreadelf(elf);
1683 }
1684 }
1685 munmap(ar_buffer, len);
1686
1687 return 0;
1688 }
1689 /* scan a file which may be an elf or an archive or some other magical beast */
1690 static int scanelf_fileat(int dir_fd, const char *filename, const struct stat *st_cache)
1691 {
1692 const struct stat *st = st_cache;
1693 struct stat symlink_st;
1694 int fd;
1695
1696 /* always handle regular files and handle symlinked files if no -y */
1697 if (S_ISLNK(st->st_mode)) {
1698 if (!scan_symlink)
1699 return 1;
1700 fstatat(dir_fd, filename, &symlink_st, 0);
1701 st = &symlink_st;
1702 }
1703
1704 if (!S_ISREG(st->st_mode)) {
1705 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1706 return 1;
1707 }
1708
1709 if (match_perms) {
1710 if ((st->st_mode | match_perms) != st->st_mode)
1711 return 1;
1712 }
1713 fd = openat(dir_fd, filename, (fix_elf ? O_RDWR : O_RDONLY) | O_CLOEXEC);
1714 if (fd == -1) {
1715 if (fix_elf && errno == ETXTBSY)
1716 warnp("%s: could not fix", filename);
1717 else if (be_verbose > 2)
1718 printf("%s: skipping file: %s\n", filename, strerror(errno));
1719 return 1;
1720 }
1721
1722 if (scanelf_elf(filename, fd, st->st_size) == 2) {
1723 /* if it isn't an ELF, maybe it's an .a archive */
1724 if (scan_archives)
1725 scanelf_archive(filename, fd, st->st_size);
1726
1727 /*
1728 * unreadelf() implicitly closes its fd, so only close it
1729 * when we are returning it in the non-ELF case
1730 */
1731 close(fd);
1732 }
1733
1734 return 0;
1735 }
1736
1737 /* scan a directory for ET_EXEC files and print when we find one */
1738 static int scanelf_dirat(int dir_fd, const char *path)
1739 {
1740 register DIR *dir;
1741 register struct dirent *dentry;
1742 struct stat st_top, st;
1743 char buf[__PAX_UTILS_PATH_MAX], *subpath;
1744 size_t pathlen = 0, len = 0;
1745 int ret = 0;
1746 int subdir_fd;
1747
1748 /* make sure path exists */
1749 if (fstatat(dir_fd, path, &st_top, AT_SYMLINK_NOFOLLOW) == -1) {
1750 if (be_verbose > 2) printf("%s: does not exist\n", path);
1751 return 1;
1752 }
1753
1754 /* ok, if it isn't a directory, assume we can open it */
1755 if (!S_ISDIR(st_top.st_mode))
1756 return scanelf_fileat(dir_fd, path, &st_top);
1757
1758 /* now scan the dir looking for fun stuff */
1759 subdir_fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
1760 if (subdir_fd == -1)
1761 dir = NULL;
1762 else
1763 dir = fdopendir(subdir_fd);
1764 if (dir == NULL) {
1765 if (subdir_fd != -1)
1766 close(subdir_fd);
1767 else if (be_verbose > 2)
1768 printf("%s: skipping dir: %s\n", path, strerror(errno));
1769 return 1;
1770 }
1771 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1772
1773 subpath = stpcpy(buf, path);
1774 if (subpath[-1] != '/')
1775 *subpath++ = '/';
1776 pathlen = subpath - buf;
1777 while ((dentry = readdir(dir))) {
1778 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1779 continue;
1780
1781 if (fstatat(subdir_fd, dentry->d_name, &st, AT_SYMLINK_NOFOLLOW) == -1)
1782 continue;
1783
1784 len = strlen(dentry->d_name);
1785 if (len + pathlen + 1 >= sizeof(buf)) {
1786 warnf("Skipping '%s%s': len > sizeof(buf); %zu > %zu\n",
1787 path, dentry->d_name, len + pathlen + 1, sizeof(buf));
1788 continue;
1789 }
1790 memcpy(subpath, dentry->d_name, len);
1791 subpath[len] = '\0';
1792
1793 if (S_ISREG(st.st_mode))
1794 ret = scanelf_fileat(dir_fd, buf, &st);
1795 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1796 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1797 ret = scanelf_dirat(dir_fd, buf);
1798 }
1799 }
1800 closedir(dir);
1801
1802 return ret;
1803 }
1804 static int scanelf_dir(const char *path)
1805 {
1806 return scanelf_dirat(root_fd, root_rel_path(path));
1807 }
1808
1809 static int scanelf_from_file(const char *filename)
1810 {
1811 FILE *fp;
1812 char *p, *path;
1813 size_t len;
1814 int ret;
1815
1816 if (strcmp(filename, "-") == 0)
1817 fp = stdin;
1818 else if ((fp = fopen(filename, "r")) == NULL)
1819 return 1;
1820
1821 path = NULL;
1822 len = 0;
1823 ret = 0;
1824 while (getline(&path, &len, fp) != -1) {
1825 if ((p = strchr(path, '\n')) != NULL)
1826 *p = 0;
1827 search_path = path;
1828 ret = scanelf_dir(path);
1829 }
1830 free(path);
1831
1832 if (fp != stdin)
1833 fclose(fp);
1834
1835 return ret;
1836 }
1837
1838 #if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1839
1840 static int _load_ld_cache_config(const char *fname)
1841 {
1842 FILE *fp = NULL;
1843 char *p, *path;
1844 size_t len;
1845 int curr_fd = -1;
1846
1847 fp = fopenat_r(root_fd, root_rel_path(fname));
1848 if (fp == NULL)
1849 return -1;
1850
1851 path = NULL;
1852 len = 0;
1853 while (getline(&path, &len, fp) != -1) {
1854 if ((p = strrchr(path, '\r')) != NULL)
1855 *p = 0;
1856 if ((p = strchr(path, '\n')) != NULL)
1857 *p = 0;
1858
1859 /* recursive includes of the same file will make this segfault. */
1860 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1861 glob_t gl;
1862 size_t x;
1863 const char *gpath;
1864
1865 /* re-use existing path buffer ... need to be creative */
1866 if (path[8] != '/')
1867 gpath = memcpy(path + 3, "/etc/", 5);
1868 else
1869 gpath = path + 8;
1870 if (root_fd != AT_FDCWD) {
1871 if (curr_fd == -1) {
1872 curr_fd = open(".", O_RDONLY|O_CLOEXEC);
1873 if (fchdir(root_fd))
1874 errp("unable to change to root dir");
1875 }
1876 gpath = root_rel_path(gpath);
1877 }
1878
1879 if (glob(gpath, 0, NULL, &gl) == 0) {
1880 for (x = 0; x < gl.gl_pathc; ++x) {
1881 /* try to avoid direct loops */
1882 if (strcmp(gl.gl_pathv[x], fname) == 0)
1883 continue;
1884 _load_ld_cache_config(gl.gl_pathv[x]);
1885 }
1886 globfree(&gl);
1887 }
1888
1889 /* failed globs are ignored by glibc */
1890 continue;
1891 }
1892
1893 if (*path != '/')
1894 continue;
1895
1896 xarraypush_str(ldpaths, path);
1897 }
1898 free(path);
1899
1900 fclose(fp);
1901
1902 if (curr_fd != -1) {
1903 if (fchdir(curr_fd))
1904 {/* don't care */}
1905 close(curr_fd);
1906 }
1907
1908 return 0;
1909 }
1910
1911 #elif defined(__FreeBSD__) || defined(__DragonFly__)
1912
1913 static int _load_ld_cache_config(const char *fname)
1914 {
1915 FILE *fp = NULL;
1916 char *b = NULL, *p;
1917 struct elfhints_hdr hdr;
1918
1919 fp = fopenat_r(root_fd, root_rel_path(fname));
1920 if (fp == NULL)
1921 return -1;
1922
1923 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1924 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1925 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1926 {
1927 fclose(fp);
1928 return -1;
1929 }
1930
1931 b = xmalloc(hdr.dirlistlen + 1);
1932 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1933 fclose(fp);
1934 free(b);
1935 return -1;
1936 }
1937
1938 while ((p = strsep(&b, ":"))) {
1939 if (*p == '\0')
1940 continue;
1941 xarraypush_str(ldpaths, p);
1942 }
1943
1944 free(b);
1945 fclose(fp);
1946 return 0;
1947 }
1948
1949 #else
1950 #ifdef __ELF__
1951 #warning Cache config support not implemented for your target
1952 #endif
1953 static int _load_ld_cache_config(const char *fname)
1954 {
1955 return 0;
1956 }
1957 #endif
1958
1959 static void load_ld_cache_config(const char *fname)
1960 {
1961 bool scan_l, scan_ul, scan_ull;
1962 size_t n;
1963 const char *ldpath;
1964
1965 _load_ld_cache_config(fname);
1966
1967 scan_l = scan_ul = scan_ull = false;
1968 array_for_each(ldpaths, n, ldpath) {
1969 if (!scan_l && !strcmp(ldpath, "/lib")) scan_l = true;
1970 if (!scan_ul && !strcmp(ldpath, "/usr/lib")) scan_ul = true;
1971 if (!scan_ull && !strcmp(ldpath, "/usr/local/lib")) scan_ull = true;
1972 }
1973
1974 if (!scan_l) xarraypush_str(ldpaths, "/lib");
1975 if (!scan_ul) xarraypush_str(ldpaths, "/usr/lib");
1976 if (!scan_ull) xarraypush_str(ldpaths, "/usr/local/lib");
1977 }
1978
1979 /* scan /etc/ld.so.conf for paths */
1980 static void scanelf_ldpath(void)
1981 {
1982 size_t n;
1983 const char *ldpath;
1984
1985 array_for_each(ldpaths, n, ldpath)
1986 scanelf_dir(ldpath);
1987 }
1988
1989 /* scan env PATH for paths */
1990 static void scanelf_envpath(void)
1991 {
1992 char *path, *p;
1993
1994 path = getenv("PATH");
1995 if (!path)
1996 err("PATH is not set in your env !");
1997 path = xstrdup(path);
1998
1999 while ((p = strrchr(path, ':')) != NULL) {
2000 scanelf_dir(p + 1);
2001 *p = 0;
2002 }
2003
2004 free(path);
2005 }
2006
2007 /* usage / invocation handling functions */ /* Free Flags: c d j u w G H J K P Q U W */
2008 #define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZCBhV"
2009 #define a_argument required_argument
2010 static struct option const long_opts[] = {
2011 {"path", no_argument, NULL, 'p'},
2012 {"ldpath", no_argument, NULL, 'l'},
2013 {"use-ldpath",no_argument, NULL, 129},
2014 {"root", a_argument, NULL, 128},
2015 {"recursive", no_argument, NULL, 'R'},
2016 {"mount", no_argument, NULL, 'm'},
2017 {"symlink", no_argument, NULL, 'y'},
2018 {"archives", no_argument, NULL, 'A'},
2019 {"ldcache", no_argument, NULL, 'L'},
2020 {"fix", no_argument, NULL, 'X'},
2021 {"setpax", a_argument, NULL, 'z'},
2022 {"pax", no_argument, NULL, 'x'},
2023 {"header", no_argument, NULL, 'e'},
2024 {"textrel", no_argument, NULL, 't'},
2025 {"rpath", no_argument, NULL, 'r'},
2026 {"needed", no_argument, NULL, 'n'},
2027 {"interp", no_argument, NULL, 'i'},
2028 {"bind", no_argument, NULL, 'b'},
2029 {"soname", no_argument, NULL, 'S'},
2030 {"symbol", a_argument, NULL, 's'},
2031 {"section", a_argument, NULL, 'k'},
2032 {"lib", a_argument, NULL, 'N'},
2033 {"gmatch", no_argument, NULL, 'g'},
2034 {"textrels", no_argument, NULL, 'T'},
2035 {"etype", a_argument, NULL, 'E'},
2036 {"bits", a_argument, NULL, 'M'},
2037 {"endian", no_argument, NULL, 'D'},
2038 {"osabi", no_argument, NULL, 'I'},
2039 {"eabi", no_argument, NULL, 'Y'},
2040 {"perms", a_argument, NULL, 'O'},
2041 {"size", no_argument, NULL, 'Z'},
2042 {"all", no_argument, NULL, 'a'},
2043 {"quiet", no_argument, NULL, 'q'},
2044 {"verbose", no_argument, NULL, 'v'},
2045 {"format", a_argument, NULL, 'F'},
2046 {"from", a_argument, NULL, 'f'},
2047 {"file", a_argument, NULL, 'o'},
2048 {"nocolor", no_argument, NULL, 'C'},
2049 {"nobanner", no_argument, NULL, 'B'},
2050 {"help", no_argument, NULL, 'h'},
2051 {"version", no_argument, NULL, 'V'},
2052 {NULL, no_argument, NULL, 0x0}
2053 };
2054
2055 static const char * const opts_help[] = {
2056 "Scan all directories in PATH environment",
2057 "Scan all directories in /etc/ld.so.conf",
2058 "Use ld.so.conf to show full path (use with -r/-n)",
2059 "Root directory (use with -l or -p)",
2060 "Scan directories recursively",
2061 "Don't recursively cross mount points",
2062 "Don't scan symlinks",
2063 "Scan archives (.a files)",
2064 "Utilize ld.so.cache to show full path (use with -r/-n)",
2065 "Try and 'fix' bad things (use with -r/-e)",
2066 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
2067 "Print PaX markings",
2068 "Print GNU_STACK/PT_LOAD markings",
2069 "Print TEXTREL information",
2070 "Print RPATH information",
2071 "Print NEEDED information",
2072 "Print INTERP information",
2073 "Print BIND information",
2074 "Print SONAME information",
2075 "Find a specified symbol",
2076 "Find a specified section",
2077 "Find a specified library",
2078 "Use regex rather than string compare (with -s); specify twice for case insensitive",
2079 "Locate cause of TEXTREL",
2080 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
2081 "Print only ELF files matching numeric bits",
2082 "Print Endianness",
2083 "Print OSABI",
2084 "Print EABI (EM_ARM Only)",
2085 "Print only ELF files matching octal permissions",
2086 "Print ELF file size",
2087 "Print all useful/simple info\n",
2088 "Only output 'bad' things",
2089 "Be verbose (can be specified more than once)",
2090 "Use specified format for output",
2091 "Read input stream from a filename",
2092 "Write output stream to a filename",
2093 "Don't emit color in output",
2094 "Don't display the header",
2095 "Print this help and exit",
2096 "Print version and exit",
2097 NULL
2098 };
2099
2100 /* display usage and exit */
2101 static void usage(int status)
2102 {
2103 const char a_arg[] = "<arg>";
2104 size_t a_arg_len = strlen(a_arg) + 2;
2105 size_t i;
2106 int optlen;
2107 printf("* Scan ELF binaries for stuff\n\n"
2108 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
2109 printf("Options: -[%s]\n", PARSE_FLAGS);
2110
2111 /* prescan the --long opt length to auto-align */
2112 optlen = 0;
2113 for (i = 0; long_opts[i].name; ++i) {
2114 int l = strlen(long_opts[i].name);
2115 if (long_opts[i].has_arg == a_argument)
2116 l += a_arg_len;
2117 optlen = max(l, optlen);
2118 }
2119
2120 for (i = 0; long_opts[i].name; ++i) {
2121 /* first output the short flag if it has one */
2122 if (long_opts[i].val > '~')
2123 printf(" ");
2124 else
2125 printf(" -%c, ", long_opts[i].val);
2126
2127 /* then the long flag */
2128 if (long_opts[i].has_arg == no_argument)
2129 printf("--%-*s", optlen, long_opts[i].name);
2130 else
2131 printf("--%s %s %*s", long_opts[i].name, a_arg,
2132 (int)(optlen - strlen(long_opts[i].name) - a_arg_len), "");
2133
2134 /* finally the help text */
2135 printf("* %s\n", opts_help[i]);
2136 }
2137
2138 puts("\nFor more information, see the scanelf(1) manpage");
2139 exit(status);
2140 }
2141
2142 /* parse command line arguments and preform needed actions */
2143 #define do_pax_state(option, flag) \
2144 if (islower(option)) { \
2145 flags &= ~PF_##flag; \
2146 flags |= PF_NO##flag; \
2147 } else { \
2148 flags &= ~PF_NO##flag; \
2149 flags |= PF_##flag; \
2150 }
2151 static void parse_delimited(array_t *arr, char *arg, const char *delim)
2152 {
2153 char *ele = strtok(arg, delim);
2154 if (!ele) /* edge case: -s '' */
2155 xarraypush_str(arr, "");
2156 while (ele) {
2157 xarraypush_str(arr, ele);
2158 ele = strtok(NULL, delim);
2159 }
2160 }
2161 static int parseargs(int argc, char *argv[])
2162 {
2163 int i;
2164 const char *from_file = NULL;
2165 int ret = 0;
2166 char load_cache_config = 0;
2167
2168 opterr = 0;
2169 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
2170 switch (i) {
2171
2172 case 'V':
2173 printf("pax-utils-%s: %s\n%s\n"
2174 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
2175 VERSION, __FILE__, rcsid, argv0);
2176 exit(EXIT_SUCCESS);
2177 break;
2178 case 'h': usage(EXIT_SUCCESS); break;
2179 case 'f':
2180 if (from_file) warn("You prob don't want to specify -f twice");
2181 from_file = optarg;
2182 break;
2183 case 'E':
2184 /* historically, this was comma delimited */
2185 parse_delimited(match_etypes, optarg, ",");
2186 break;
2187 case 'M':
2188 match_bits = atoi(optarg);
2189 if (match_bits == 0) {
2190 if (strcmp(optarg, "ELFCLASS32") == 0)
2191 match_bits = 32;
2192 if (strcmp(optarg, "ELFCLASS64") == 0)
2193 match_bits = 64;
2194 }
2195 break;
2196 case 'O':
2197 if (sscanf(optarg, "%o", &match_perms) == -1)
2198 match_bits = 0;
2199 break;
2200 case 'o': {
2201 if (freopen(optarg, "w", stdout) == NULL)
2202 errp("Could not freopen(%s)", optarg);
2203 break;
2204 }
2205 case 'k':
2206 xarraypush_str(find_section_arr, optarg);
2207 break;
2208 case 's':
2209 /* historically, this was comma delimited */
2210 parse_delimited(find_sym_arr, optarg, ",");
2211 break;
2212 case 'N':
2213 xarraypush_str(find_lib_arr, optarg);
2214 break;
2215 case 'F': {
2216 if (out_format) warn("You prob don't want to specify -F twice");
2217 out_format = optarg;
2218 break;
2219 }
2220 case 'z': {
2221 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
2222 size_t x;
2223
2224 for (x = 0; x < strlen(optarg); x++) {
2225 switch (optarg[x]) {
2226 case 'p':
2227 case 'P':
2228 do_pax_state(optarg[x], PAGEEXEC);
2229 break;
2230 case 's':
2231 case 'S':
2232 do_pax_state(optarg[x], SEGMEXEC);
2233 break;
2234 case 'm':
2235 case 'M':
2236 do_pax_state(optarg[x], MPROTECT);
2237 break;
2238 case 'e':
2239 case 'E':
2240 do_pax_state(optarg[x], EMUTRAMP);
2241 break;
2242 case 'r':
2243 case 'R':
2244 do_pax_state(optarg[x], RANDMMAP);
2245 break;
2246 case 'x':
2247 case 'X':
2248 do_pax_state(optarg[x], RANDEXEC);
2249 break;
2250 default:
2251 break;
2252 }
2253 }
2254 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
2255 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
2256 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
2257 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
2258 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
2259 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
2260 setpax = flags;
2261 break;
2262 }
2263 case 'Z': show_size = 1; break;
2264 case 'g': ++g_match; break;
2265 case 'L': load_cache_config = use_ldcache = 1; break;
2266 case 'y': scan_symlink = 0; break;
2267 case 'A': scan_archives = 1; break;
2268 case 'C': color_init(true); break;
2269 case 'B': show_banner = 0; break;
2270 case 'l': load_cache_config = scan_ldpath = 1; break;
2271 case 'p': scan_envpath = 1; break;
2272 case 'R': dir_recurse = 1; break;
2273 case 'm': dir_crossmount = 0; break;
2274 case 'X': ++fix_elf; break;
2275 case 'x': show_pax = 1; break;
2276 case 'e': show_phdr = 1; break;
2277 case 't': show_textrel = 1; break;
2278 case 'r': show_rpath = 1; break;
2279 case 'n': show_needed = 1; break;
2280 case 'i': show_interp = 1; break;
2281 case 'b': show_bind = 1; break;
2282 case 'S': show_soname = 1; break;
2283 case 'T': show_textrels = 1; break;
2284 case 'q': be_quiet = min(be_quiet, 20) + 1; break;
2285 case 'v': be_verbose = min(be_verbose, 20) + 1; break;
2286 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
2287 case 'D': show_endian = 1; break;
2288 case 'I': show_osabi = 1; break;
2289 case 'Y': show_eabi = 1; break;
2290 case 128:
2291 root_fd = open(optarg, O_RDONLY|O_CLOEXEC);
2292 if (root_fd == -1)
2293 err("Could not open root: %s", optarg);
2294 break;
2295 case 129: load_cache_config = use_ldpath = 1; break;
2296 case ':':
2297 err("Option '%c' is missing parameter", optopt);
2298 case '?':
2299 err("Unknown option '%c' or argument missing", optopt);
2300 default:
2301 err("Unhandled option '%c'; please report this", i);
2302 }
2303 }
2304 if (show_textrels && be_verbose)
2305 objdump = which("objdump", "OBJDUMP");
2306 /* precompile all the regexes */
2307 if (g_match) {
2308 regex_t preg;
2309 const char *this_sym;
2310 size_t n;
2311 int flags = REG_EXTENDED | REG_NOSUB | (g_match > 1 ? REG_ICASE : 0);
2312
2313 array_for_each(find_sym_arr, n, this_sym) {
2314 /* see scanelf_match_symname for logic info */
2315 switch (this_sym[0]) {
2316 case '%':
2317 while (*(this_sym++))
2318 if (*this_sym == '%') {
2319 ++this_sym;
2320 break;
2321 }
2322 break;
2323 case '+':
2324 case '-':
2325 ++this_sym;
2326 break;
2327 }
2328 if (*this_sym == '*')
2329 ++this_sym;
2330
2331 ret = regcomp(&preg, this_sym, flags);
2332 if (ret) {
2333 char err[256];
2334 regerror(ret, &preg, err, sizeof(err));
2335 err("regcomp of %s failed: %s", this_sym, err);
2336 }
2337 xarraypush(find_sym_regex_arr, &preg, sizeof(preg));
2338 }
2339 }
2340 /* flatten arrays for display */
2341 find_sym = array_flatten_str(find_sym_arr);
2342 find_lib = array_flatten_str(find_lib_arr);
2343 find_section = array_flatten_str(find_section_arr);
2344 /* let the format option override all other options */
2345 if (out_format) {
2346 show_pax = show_phdr = show_textrel = show_rpath = \
2347 show_needed = show_interp = show_bind = show_soname = \
2348 show_textrels = show_perms = show_endian = show_size = \
2349 show_osabi = show_eabi = 0;
2350 for (i = 0; out_format[i]; ++i) {
2351 if (!IS_MODIFIER(out_format[i])) continue;
2352
2353 switch (out_format[++i]) {
2354 case '+': break;
2355 case '%': break;
2356 case '#': break;
2357 case 'F': break;
2358 case 'p': break;
2359 case 'f': break;
2360 case 'k': break;
2361 case 's': break;
2362 case 'N': break;
2363 case 'o': break;
2364 case 'a': break;
2365 case 'M': break;
2366 case 'Z': show_size = 1; break;
2367 case 'D': show_endian = 1; break;
2368 case 'I': show_osabi = 1; break;
2369 case 'Y': show_eabi = 1; break;
2370 case 'O': show_perms = 1; break;
2371 case 'x': show_pax = 1; break;
2372 case 'e': show_phdr = 1; break;
2373 case 't': show_textrel = 1; break;
2374 case 'r': show_rpath = 1; break;
2375 case 'n': show_needed = 1; break;
2376 case 'i': show_interp = 1; break;
2377 case 'b': show_bind = 1; break;
2378 case 'S': show_soname = 1; break;
2379 case 'T': show_textrels = 1; break;
2380 default:
2381 err("invalid format specifier '%c' (byte %i)",
2382 out_format[i], i+1);
2383 }
2384 }
2385
2386 /* construct our default format */
2387 } else {
2388 size_t fmt_len = 30;
2389 out_format = xmalloc(sizeof(char) * fmt_len);
2390 *out_format = '\0';
2391 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
2392 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
2393 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
2394 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
2395 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
2396 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
2397 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
2398 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
2399 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
2400 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
2401 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
2402 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
2403 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
2404 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
2405 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
2406 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
2407 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
2408 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
2409 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
2410 }
2411 if (be_verbose > 2) printf("Format: %s\n", out_format);
2412
2413 /* now lets actually do the scanning */
2414 if (load_cache_config)
2415 load_ld_cache_config(__PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
2416 if (scan_ldpath) scanelf_ldpath();
2417 if (scan_envpath) scanelf_envpath();
2418 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
2419 from_file = "-";
2420 if (from_file) {
2421 scanelf_from_file(from_file);
2422 from_file = *argv;
2423 }
2424 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
2425 err("Nothing to scan !?");
2426 while (optind < argc) {
2427 search_path = argv[optind++];
2428 ret = scanelf_dir(search_path);
2429 }
2430
2431 #ifdef __PAX_UTILS_CLEANUP
2432 /* clean up */
2433 xarrayfree(ldpaths);
2434 xarrayfree(find_sym_arr);
2435 xarrayfree(find_lib_arr);
2436 xarrayfree(find_section_arr);
2437 free(find_sym);
2438 free(find_lib);
2439 free(find_section);
2440 {
2441 size_t n;
2442 regex_t *preg;
2443 array_for_each(find_sym_regex_arr, n, preg)
2444 regfree(preg);
2445 xarrayfree(find_sym_regex_arr);
2446 }
2447
2448 if (ldcache != 0)
2449 munmap(ldcache, ldcache_size);
2450 #endif
2451
2452 return ret;
2453 }
2454
2455 static char **get_split_env(const char *envvar)
2456 {
2457 const char *delims = " \t\n";
2458 char **envvals = NULL;
2459 char *env, *s;
2460 int nentry;
2461
2462 if ((env = getenv(envvar)) == NULL)
2463 return NULL;
2464
2465 env = xstrdup(env);
2466 if (env == NULL)
2467 return NULL;
2468
2469 s = strtok(env, delims);
2470 if (s == NULL) {
2471 free(env);
2472 return NULL;
2473 }
2474
2475 nentry = 0;
2476 while (s != NULL) {
2477 ++nentry;
2478 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
2479 envvals[nentry-1] = s;
2480 s = strtok(NULL, delims);
2481 }
2482 envvals[nentry] = NULL;
2483
2484 /* don't want to free(env) as it contains the memory that backs
2485 * the envvals array of strings */
2486 return envvals;
2487 }
2488
2489 static void parseenv(void)
2490 {
2491 color_init(false);
2492 qa_textrels = get_split_env("QA_TEXTRELS");
2493 qa_execstack = get_split_env("QA_EXECSTACK");
2494 qa_wx_load = get_split_env("QA_WX_LOAD");
2495 }
2496
2497 #ifdef __PAX_UTILS_CLEANUP
2498 static void cleanup(void)
2499 {
2500 free(out_format);
2501 free(qa_textrels);
2502 free(qa_execstack);
2503 free(qa_wx_load);
2504 }
2505 #endif
2506
2507 int main(int argc, char *argv[])
2508 {
2509 int ret;
2510 if (argc < 2)
2511 usage(EXIT_FAILURE);
2512 parseenv();
2513 ret = parseargs(argc, argv);
2514 fclose(stdout);
2515 #ifdef __PAX_UTILS_CLEANUP
2516 cleanup();
2517 warn("The calls to add/delete heap should be off:\n"
2518 "\t- 1 due to the out_buffer not being freed in scanelf_fileat()\n"
2519 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
2520 #endif
2521 return ret;
2522 }
2523
2524 /* Match filename against entries in matchlist, return TRUE
2525 * if the file is listed */
2526 static int file_matches_list(const char *filename, char **matchlist)
2527 {
2528 char **file;
2529 char *match;
2530 char buf[__PAX_UTILS_PATH_MAX];
2531
2532 if (matchlist == NULL)
2533 return 0;
2534
2535 for (file = matchlist; *file != NULL; file++) {
2536 if (search_path) {
2537 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2538 match = buf;
2539 } else {
2540 match = *file;
2541 }
2542 if (fnmatch(match, filename, 0) == 0)
2543 return 1;
2544 }
2545 return 0;
2546 }

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