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Revision 1.273 - (show annotations) (download) (as text)
Sun Feb 22 01:38:28 2015 UTC (4 years, 2 months ago) by vapier
Branch: MAIN
Changes since 1.272: +5 -3 lines
File MIME type: text/x-csrc
scanelf: add a few more elf->phdr checks

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 1.272 2015/02/22 00:54:34 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 1.272 2015/02/22 00:54:34 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 if (!elf->phdr)
233 return;
234 #define GET_SYMTABS_DT(B) \
235 if (elf->elf_class == ELFCLASS ## B) { \
236 size_t i; \
237 static Elf ## B ## _Shdr sym_shdr, str_shdr; \
238 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
239 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
240 Elf ## B ## _Addr vsym, vstr, vhash, vgnu_hash; \
241 Elf ## B ## _Dyn *dyn; \
242 Elf ## B ## _Off offset; \
243 \
244 /* lookup symbols used at runtime with DT_SYMTAB / DT_STRTAB */ \
245 vsym = vstr = vhash = vgnu_hash = 0; \
246 memset(&sym_shdr, 0, sizeof(sym_shdr)); \
247 memset(&str_shdr, 0, sizeof(str_shdr)); \
248 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
249 if (EGET(phdr[i].p_type) != PT_DYNAMIC) \
250 continue; \
251 \
252 offset = EGET(phdr[i].p_offset); \
253 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
254 continue; \
255 \
256 dyn = DYN ## B (elf->vdata + offset); \
257 while (EGET(dyn->d_tag) != DT_NULL) { \
258 switch (EGET(dyn->d_tag)) { \
259 case DT_SYMTAB: vsym = EGET(dyn->d_un.d_val); break; \
260 case DT_SYMENT: sym_shdr.sh_entsize = dyn->d_un.d_val; break; \
261 case DT_STRTAB: vstr = EGET(dyn->d_un.d_val); break; \
262 case DT_STRSZ: str_shdr.sh_size = dyn->d_un.d_val; break; \
263 case DT_HASH: vhash = EGET(dyn->d_un.d_val); break; \
264 /*case DT_GNU_HASH: vgnu_hash = EGET(dyn->d_un.d_val); break;*/ \
265 } \
266 ++dyn; \
267 } \
268 if (vsym && vstr) \
269 break; \
270 } \
271 if (!vsym || !vstr || !(vhash || vgnu_hash)) \
272 return; \
273 \
274 /* calc offset into the ELF by finding the load addr of the syms */ \
275 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
276 Elf ## B ## _Addr vaddr = EGET(phdr[i].p_vaddr); \
277 Elf ## B ## _Addr filesz = EGET(phdr[i].p_filesz); \
278 offset = EGET(phdr[i].p_offset); \
279 \
280 if (EGET(phdr[i].p_type) != PT_LOAD) \
281 continue; \
282 \
283 if (vhash >= vaddr && vhash < vaddr + filesz) { \
284 /* Scan the hash table to see how many entries we have */ \
285 Elf32_Word max_sym_idx = 0; \
286 Elf32_Word *hashtbl = elf->vdata + offset + (vhash - vaddr); \
287 Elf32_Word b, nbuckets = EGET(hashtbl[0]); \
288 Elf32_Word nchains = EGET(hashtbl[1]); \
289 Elf32_Word *buckets = &hashtbl[2]; \
290 Elf32_Word *chains = &buckets[nbuckets]; \
291 Elf32_Word sym_idx; \
292 \
293 for (b = 0; b < nbuckets; ++b) { \
294 if (!buckets[b]) \
295 continue; \
296 for (sym_idx = buckets[b]; sym_idx < nchains && sym_idx; sym_idx = chains[sym_idx]) \
297 if (max_sym_idx < sym_idx) \
298 max_sym_idx = sym_idx; \
299 } \
300 ESET(sym_shdr.sh_size, sym_shdr.sh_entsize * max_sym_idx); \
301 } \
302 \
303 if (vsym >= vaddr && vsym < vaddr + filesz) { \
304 ESET(sym_shdr.sh_offset, offset + (vsym - vaddr)); \
305 *sym = &sym_shdr; \
306 } \
307 \
308 if (vstr >= vaddr && vstr < vaddr + filesz) { \
309 ESET(str_shdr.sh_offset, offset + (vstr - vaddr)); \
310 *str = &str_shdr; \
311 } \
312 } \
313 }
314 GET_SYMTABS_DT(32)
315 GET_SYMTABS_DT(64)
316 }
317
318 static char *scanelf_file_pax(elfobj *elf, char *found_pax)
319 {
320 static char ret[7];
321 unsigned long i, shown;
322
323 if (!show_pax) return NULL;
324
325 shown = 0;
326 memset(&ret, 0, sizeof(ret));
327
328 if (elf->phdr) {
329 #define SHOW_PAX(B) \
330 if (elf->elf_class == ELFCLASS ## B) { \
331 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
332 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
333 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
334 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
335 continue; \
336 if (fix_elf && setpax) { \
337 /* set the paxctl flags */ \
338 ESET(phdr[i].p_flags, setpax); \
339 } \
340 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
341 continue; \
342 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
343 *found_pax = 1; \
344 ++shown; \
345 break; \
346 } \
347 }
348 SHOW_PAX(32)
349 SHOW_PAX(64)
350 }
351
352 /* Note: We do not support setting EI_PAX if not PT_PAX_FLAGS
353 * was found. This is known to break ELFs on glibc systems,
354 * and mainline PaX has deprecated use of this for a long time.
355 * We could support changing PT_GNU_STACK, but that doesn't
356 * seem like it's worth the effort. #411919
357 */
358
359 /* fall back to EI_PAX if no PT_PAX was found */
360 if (!*ret) {
361 static char *paxflags;
362 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
363 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
364 *found_pax = 1;
365 return (be_wewy_wewy_quiet ? NULL : paxflags);
366 }
367 strncpy(ret, paxflags, sizeof(ret));
368 }
369
370 if (be_wewy_wewy_quiet || (be_quiet && !shown))
371 return NULL;
372 else
373 return ret;
374 }
375
376 static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
377 {
378 static char ret[12];
379 char *found;
380 unsigned long i, shown, multi_stack, multi_relro, multi_load;
381
382 if (!show_phdr) return NULL;
383
384 memcpy(ret, "--- --- ---\0", 12);
385
386 shown = 0;
387 multi_stack = multi_relro = multi_load = 0;
388
389 #define NOTE_GNU_STACK ".note.GNU-stack"
390 #define SHOW_PHDR(B) \
391 if (elf->elf_class == ELFCLASS ## B) { \
392 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
393 Elf ## B ## _Off offset; \
394 uint32_t flags, check_flags; \
395 if (elf->phdr != NULL) { \
396 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
397 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
398 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
399 if (multi_stack++) \
400 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
401 if (file_matches_list(elf->filename, qa_execstack)) \
402 continue; \
403 found = found_phdr; \
404 offset = 0; \
405 check_flags = PF_X; \
406 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
407 if (multi_relro++) \
408 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
409 found = found_relro; \
410 offset = 4; \
411 check_flags = PF_X; \
412 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
413 if (file_matches_list(elf->filename, qa_wx_load)) \
414 continue; \
415 found = found_load; \
416 offset = 8; \
417 check_flags = PF_W|PF_X; \
418 } else \
419 continue; \
420 flags = EGET(phdr[i].p_flags); \
421 if (be_quiet && ((flags & check_flags) != check_flags)) \
422 continue; \
423 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
424 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
425 ret[3] = ret[7] = '!'; \
426 flags = EGET(phdr[i].p_flags); \
427 } \
428 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
429 *found = 1; \
430 ++shown; \
431 } \
432 } else if (elf->shdr != NULL) { \
433 /* no program headers which means this is prob an object file */ \
434 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
435 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
436 if ((void*)strtbl > elf->data_end) \
437 goto skip_this_shdr##B; \
438 /* let's flag -w/+x object files since the final ELF will most likely \
439 * need write access to the stack (who doesn't !?). so the combined \
440 * output will bring in +w automatically and that's bad. \
441 */ \
442 check_flags = /*SHF_WRITE|*/SHF_EXECINSTR; \
443 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
444 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
445 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
446 if (offset >= elf->len - sizeof(NOTE_GNU_STACK)) \
447 continue; \
448 if (!strcmp(elf->data + offset, NOTE_GNU_STACK)) { \
449 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
450 flags = EGET(shdr[i].sh_flags); \
451 if (be_quiet && ((flags & check_flags) != check_flags)) \
452 continue; \
453 ++*found_phdr; \
454 shown = 1; \
455 if (flags & SHF_WRITE) ret[0] = 'W'; \
456 if (flags & SHF_ALLOC) ret[1] = 'A'; \
457 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
458 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
459 break; \
460 } \
461 } \
462 skip_this_shdr##B: \
463 if (!multi_stack) { \
464 if (file_matches_list(elf->filename, qa_execstack)) \
465 return NULL; \
466 *found_phdr = 1; \
467 shown = 1; \
468 memcpy(ret, "!WX", 3); \
469 } \
470 } \
471 }
472 SHOW_PHDR(32)
473 SHOW_PHDR(64)
474
475 if (be_wewy_wewy_quiet || (be_quiet && !shown))
476 return NULL;
477 else
478 return ret;
479 }
480
481 /*
482 * See if this ELF contains a DT_TEXTREL tag in any of its
483 * PT_DYNAMIC sections.
484 */
485 static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
486 {
487 static const char *ret = "TEXTREL";
488 unsigned long i;
489
490 if (!show_textrel && !show_textrels) return NULL;
491
492 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
493
494 if (elf->phdr) {
495 #define SHOW_TEXTREL(B) \
496 if (elf->elf_class == ELFCLASS ## B) { \
497 Elf ## B ## _Dyn *dyn; \
498 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
499 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
500 Elf ## B ## _Off offset; \
501 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
502 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
503 offset = EGET(phdr[i].p_offset); \
504 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
505 dyn = DYN ## B (elf->vdata + offset); \
506 while (EGET(dyn->d_tag) != DT_NULL) { \
507 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
508 *found_textrel = 1; \
509 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
510 return (be_wewy_wewy_quiet ? NULL : ret); \
511 } \
512 ++dyn; \
513 } \
514 } }
515 SHOW_TEXTREL(32)
516 SHOW_TEXTREL(64)
517 }
518
519 if (be_quiet || be_wewy_wewy_quiet)
520 return NULL;
521 else
522 return " - ";
523 }
524
525 /*
526 * Scan the .text section to see if there are any relocations in it.
527 * Should rewrite this to check PT_LOAD sections that are marked
528 * Executable rather than the section named '.text'.
529 */
530 static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
531 {
532 unsigned long s, r, rmax;
533 void *symtab_void, *strtab_void, *text_void;
534
535 if (!show_textrels) return NULL;
536
537 /* don't search for TEXTREL's if the ELF doesn't have any */
538 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
539 if (!*found_textrel) return NULL;
540
541 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
542 text_void = elf_findsecbyname(elf, ".text");
543
544 if (symtab_void && strtab_void && text_void && elf->shdr) {
545 #define SHOW_TEXTRELS(B) \
546 if (elf->elf_class == ELFCLASS ## B) { \
547 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
548 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
549 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
550 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
551 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
552 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
553 uint ## B ## _t memsz = EGET(text->sh_size); \
554 Elf ## B ## _Rel *rel; \
555 Elf ## B ## _Rela *rela; \
556 /* search the section headers for relocations */ \
557 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
558 uint32_t sh_type = EGET(shdr[s].sh_type); \
559 if (sh_type == SHT_REL) { \
560 rel = REL ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
561 rela = NULL; \
562 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
563 } else if (sh_type == SHT_RELA) { \
564 rel = NULL; \
565 rela = RELA ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
566 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
567 } else \
568 continue; \
569 /* now see if any of the relocs are in the .text */ \
570 for (r = 0; r < rmax; ++r) { \
571 unsigned long sym_max; \
572 Elf ## B ## _Addr offset_tmp; \
573 Elf ## B ## _Sym *func; \
574 Elf ## B ## _Sym *sym; \
575 Elf ## B ## _Addr r_offset; \
576 uint ## B ## _t r_info; \
577 if (sh_type == SHT_REL) { \
578 r_offset = EGET(rel[r].r_offset); \
579 r_info = EGET(rel[r].r_info); \
580 } else { \
581 r_offset = EGET(rela[r].r_offset); \
582 r_info = EGET(rela[r].r_info); \
583 } \
584 /* make sure this relocation is inside of the .text */ \
585 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
586 if (be_verbose <= 2) continue; \
587 } else \
588 *found_textrels = 1; \
589 /* locate this relocation symbol name */ \
590 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
591 if ((void*)sym > elf->data_end) { \
592 warn("%s: corrupt ELF symbol", elf->filename); \
593 continue; \
594 } \
595 sym_max = ELF ## B ## _R_SYM(r_info); \
596 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
597 sym += sym_max; \
598 else \
599 sym = NULL; \
600 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
601 /* show the raw details about this reloc */ \
602 printf(" %s: ", elf->base_filename); \
603 if (sym && sym->st_name) \
604 printf("%s", elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
605 else \
606 printf("(memory/data?)"); \
607 printf(" [0x%lX]", (unsigned long)r_offset); \
608 /* now try to find the closest symbol that this rel is probably in */ \
609 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
610 func = NULL; \
611 offset_tmp = 0; \
612 while (sym_max--) { \
613 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
614 func = sym; \
615 offset_tmp = EGET(sym->st_value); \
616 } \
617 ++sym; \
618 } \
619 printf(" in "); \
620 if (func && func->st_name) { \
621 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
622 if (r_offset > EGET(func->st_size)) \
623 printf("(optimized out: previous %s)", func_name); \
624 else \
625 printf("%s", func_name); \
626 } else \
627 printf("(optimized out)"); \
628 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
629 if (be_verbose && objdump) { \
630 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
631 char *sysbuf; \
632 size_t syslen; \
633 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"; \
634 syslen = sizeof(sysfmt) + strlen(objdump) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
635 sysbuf = xmalloc(syslen); \
636 if (end_addr < r_offset) \
637 /* not uncommon when things are optimized out */ \
638 end_addr = r_offset + 0x100; \
639 snprintf(sysbuf, syslen, sysfmt, \
640 objdump, \
641 (unsigned long)offset_tmp, \
642 (unsigned long)end_addr, \
643 elf->filename, \
644 (unsigned long)r_offset); \
645 fflush(stdout); \
646 if (system(sysbuf)) {/* don't care */} \
647 fflush(stdout); \
648 free(sysbuf); \
649 } \
650 } \
651 } }
652 SHOW_TEXTRELS(32)
653 SHOW_TEXTRELS(64)
654 }
655 if (!*found_textrels)
656 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
657
658 return NULL;
659 }
660
661 static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
662 {
663 struct stat st;
664 switch (*item) {
665 case '/': break;
666 case '.':
667 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
668 break;
669 case ':':
670 case '\0':
671 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
672 break;
673 case '$':
674 if (fstat(elf->fd, &st) != -1)
675 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
676 warnf("Security problem with %s='%s' in %s with mode set of %o",
677 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
678 break;
679 default:
680 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
681 break;
682 }
683 if (fix_elf)
684 warnf("Note: RPATH has been automatically fixed, but this should be fixed in the package itself");
685 }
686 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
687 {
688 unsigned long i;
689 char *rpath, *runpath, **r;
690 void *strtbl_void;
691
692 if (!show_rpath) return;
693
694 strtbl_void = elf_findsecbyname(elf, ".dynstr");
695 rpath = runpath = NULL;
696
697 if (elf->phdr && strtbl_void) {
698 #define SHOW_RPATH(B) \
699 if (elf->elf_class == ELFCLASS ## B) { \
700 Elf ## B ## _Dyn *dyn; \
701 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
702 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
703 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
704 Elf ## B ## _Off offset; \
705 Elf ## B ## _Xword word; \
706 /* Scan all the program headers */ \
707 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
708 /* Just scan dynamic headers */ \
709 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
710 offset = EGET(phdr[i].p_offset); \
711 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
712 /* Just scan dynamic RPATH/RUNPATH headers */ \
713 dyn = DYN ## B (elf->vdata + offset); \
714 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
715 if (word == DT_RPATH) { \
716 r = &rpath; \
717 } else if (word == DT_RUNPATH) { \
718 r = &runpath; \
719 } else { \
720 ++dyn; \
721 continue; \
722 } \
723 /* Verify the memory is somewhat sane */ \
724 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
725 if (offset < (Elf ## B ## _Off)elf->len) { \
726 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
727 *r = elf->data + offset; \
728 /* cache the length in case we need to nuke this section later on */ \
729 if (fix_elf) \
730 offset = strlen(*r); \
731 /* If quiet, don't output paths in ld.so.conf */ \
732 if (be_quiet) { \
733 size_t len; \
734 char *start, *end; \
735 /* note that we only 'chop' off leading known paths. */ \
736 /* since *r is read-only memory, we can only move the ptr forward. */ \
737 start = *r; \
738 /* scan each path in : delimited list */ \
739 while (start) { \
740 rpath_security_checks(elf, start, get_elfdtype(word)); \
741 end = strchr(start, ':'); \
742 len = (end ? abs(end - start) : strlen(start)); \
743 if (use_ldcache) { \
744 size_t n; \
745 const char *ldpath; \
746 array_for_each(ldpaths, n, ldpath) \
747 if (!strncmp(ldpath, start, len) && !ldpath[len]) { \
748 *r = end; \
749 /* corner case ... if RPATH reads "/usr/lib:", we want \
750 * to show ':' rather than '' */ \
751 if (end && end[1] != '\0') \
752 (*r)++; \
753 break; \
754 } \
755 } \
756 if (!*r || !end) \
757 break; \
758 else \
759 start = start + len + 1; \
760 } \
761 } \
762 if (*r) { \
763 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
764 /* just nuke it */ \
765 nuke_it##B: \
766 memset(*r, 0x00, offset); \
767 *r = NULL; \
768 ESET(dyn->d_tag, DT_DEBUG); \
769 ESET(dyn->d_un.d_ptr, 0); \
770 } else if (fix_elf) { \
771 /* try to clean "bad" paths */ \
772 size_t len, tmpdir_len; \
773 char *start, *end; \
774 const char *tmpdir; \
775 start = *r; \
776 tmpdir = (getenv("TMPDIR") ? : "."); \
777 tmpdir_len = strlen(tmpdir); \
778 while (1) { \
779 end = strchr(start, ':'); \
780 if (start == end) { \
781 eat_this_path##B: \
782 len = strlen(end); \
783 memmove(start, end+1, len); \
784 start[len-1] = '\0'; \
785 end = start - 1; \
786 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
787 if (!end) { \
788 if (start == *r) \
789 goto nuke_it##B; \
790 *--start = '\0'; \
791 } else \
792 goto eat_this_path##B; \
793 } \
794 if (!end) \
795 break; \
796 start = end + 1; \
797 } \
798 if (**r == '\0') \
799 goto nuke_it##B; \
800 } \
801 if (*r) \
802 *found_rpath = 1; \
803 } \
804 } \
805 ++dyn; \
806 } \
807 } }
808 SHOW_RPATH(32)
809 SHOW_RPATH(64)
810 }
811
812 if (be_wewy_wewy_quiet) return;
813
814 if (rpath && runpath) {
815 if (!strcmp(rpath, runpath)) {
816 xstrcat(ret, runpath, ret_len);
817 } else {
818 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
819 xchrcat(ret, '{', ret_len);
820 xstrcat(ret, rpath, ret_len);
821 xchrcat(ret, ',', ret_len);
822 xstrcat(ret, runpath, ret_len);
823 xchrcat(ret, '}', ret_len);
824 }
825 } else if (rpath || runpath)
826 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
827 else if (!be_quiet)
828 xstrcat(ret, " - ", ret_len);
829 }
830
831 /* Defines can be seen in glibc's sysdeps/generic/ldconfig.h */
832 #define LDSO_CACHE_MAGIC "ld.so-"
833 #define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
834 #define LDSO_CACHE_VER "1.7.0"
835 #define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
836 #define FLAG_ANY -1
837 #define FLAG_TYPE_MASK 0x00ff
838 #define FLAG_LIBC4 0x0000
839 #define FLAG_ELF 0x0001
840 #define FLAG_ELF_LIBC5 0x0002
841 #define FLAG_ELF_LIBC6 0x0003
842 #define FLAG_REQUIRED_MASK 0xff00
843 #define FLAG_SPARC_LIB64 0x0100
844 #define FLAG_IA64_LIB64 0x0200
845 #define FLAG_X8664_LIB64 0x0300
846 #define FLAG_S390_LIB64 0x0400
847 #define FLAG_POWERPC_LIB64 0x0500
848 #define FLAG_MIPS64_LIBN32 0x0600
849 #define FLAG_MIPS64_LIBN64 0x0700
850 #define FLAG_X8664_LIBX32 0x0800
851 #define FLAG_ARM_LIBHF 0x0900
852 #define FLAG_AARCH64_LIB64 0x0a00
853
854 #if defined(__GLIBC__) || defined(__UCLIBC__)
855
856 static char *lookup_cache_lib(elfobj *elf, const char *fname)
857 {
858 int fd;
859 char *strs;
860 static char buf[__PAX_UTILS_PATH_MAX] = "";
861 const char *cachefile = root_rel_path("/etc/ld.so.cache");
862 struct stat st;
863
864 typedef struct {
865 char magic[LDSO_CACHE_MAGIC_LEN];
866 char version[LDSO_CACHE_VER_LEN];
867 int nlibs;
868 } header_t;
869 header_t *header;
870
871 typedef struct {
872 int flags;
873 int sooffset;
874 int liboffset;
875 } libentry_t;
876 libentry_t *libent;
877
878 if (fname == NULL)
879 return NULL;
880
881 if (ldcache == NULL) {
882 if (fstatat(root_fd, cachefile, &st, 0))
883 return NULL;
884
885 fd = openat(root_fd, cachefile, O_RDONLY);
886 if (fd == -1)
887 return NULL;
888
889 /* cache these values so we only map/unmap the cache file once */
890 ldcache_size = st.st_size;
891 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
892 close(fd);
893
894 if (ldcache == MAP_FAILED) {
895 ldcache = NULL;
896 return NULL;
897 }
898
899 if (memcmp(header->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN) ||
900 memcmp(header->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
901 {
902 munmap(ldcache, ldcache_size);
903 ldcache = NULL;
904 return NULL;
905 }
906 } else
907 header = ldcache;
908
909 libent = ldcache + sizeof(header_t);
910 strs = (char *) &libent[header->nlibs];
911
912 for (fd = 0; fd < header->nlibs; ++fd) {
913 /* This should be more fine grained, but for now we assume that
914 * diff arches will not be cached together, and we ignore the
915 * the different multilib mips cases.
916 */
917 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
918 continue;
919 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
920 continue;
921
922 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
923 continue;
924
925 /* Return first hit because that is how the ldso rolls */
926 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
927 break;
928 }
929
930 return buf;
931 }
932
933 #elif defined(__NetBSD__)
934 static char *lookup_cache_lib(elfobj *elf, const char *fname)
935 {
936 static char buf[__PAX_UTILS_PATH_MAX] = "";
937 static struct stat st;
938 size_t n;
939 char *ldpath;
940
941 array_for_each(ldpath, n, ldpath) {
942 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", ldpath, fname) >= sizeof(buf))
943 continue; /* if the pathname is too long, or something went wrong, ignore */
944
945 if (stat(buf, &st) != 0)
946 continue; /* if the lib doesn't exist in *ldpath, look further */
947
948 /* NetBSD doesn't actually do sanity checks, it just loads the file
949 * and if that doesn't work, continues looking in other directories.
950 * This cannot easily be safely emulated, unfortunately. For now,
951 * just assume that if it exists, it's a valid library. */
952
953 return buf;
954 }
955
956 /* not found in any path */
957 return NULL;
958 }
959 #else
960 #ifdef __ELF__
961 #warning Cache support not implemented for your target
962 #endif
963 static char *lookup_cache_lib(elfobj *elf, const char *fname)
964 {
965 return NULL;
966 }
967 #endif
968
969 static char *lookup_config_lib(const char *fname)
970 {
971 static char buf[__PAX_UTILS_PATH_MAX] = "";
972 const char *ldpath;
973 size_t n;
974
975 array_for_each(ldpaths, n, ldpath) {
976 snprintf(buf, sizeof(buf), "%s/%s", root_rel_path(ldpath), fname);
977 if (faccessat(root_fd, buf, F_OK, AT_SYMLINK_NOFOLLOW) == 0)
978 return buf;
979 }
980
981 return NULL;
982 }
983
984 static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
985 {
986 unsigned long i;
987 char *needed;
988 void *strtbl_void;
989 char *p;
990
991 /*
992 * -n -> op==0 -> print all
993 * -N -> op==1 -> print requested
994 */
995 if ((op == 0 && !show_needed) || (op == 1 && !find_lib))
996 return NULL;
997
998 strtbl_void = elf_findsecbyname(elf, ".dynstr");
999
1000 if (elf->phdr && strtbl_void) {
1001 #define SHOW_NEEDED(B) \
1002 if (elf->elf_class == ELFCLASS ## B) { \
1003 Elf ## B ## _Dyn *dyn; \
1004 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1005 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1006 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
1007 Elf ## B ## _Off offset; \
1008 size_t matched = 0; \
1009 /* Walk all the program headers to find the PT_DYNAMIC */ \
1010 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1011 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) \
1012 continue; \
1013 offset = EGET(phdr[i].p_offset); \
1014 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
1015 continue; \
1016 /* Walk all the dynamic tags to find NEEDED entries */ \
1017 dyn = DYN ## B (elf->vdata + offset); \
1018 while (EGET(dyn->d_tag) != DT_NULL) { \
1019 if (EGET(dyn->d_tag) == DT_NEEDED) { \
1020 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
1021 if (offset >= (Elf ## B ## _Off)elf->len) { \
1022 ++dyn; \
1023 continue; \
1024 } \
1025 needed = elf->data + offset; \
1026 if (op == 0) { \
1027 /* -n -> print all entries */ \
1028 if (!be_wewy_wewy_quiet) { \
1029 if (*found_needed) xchrcat(ret, ',', ret_len); \
1030 if (use_ldpath) { \
1031 if ((p = lookup_config_lib(needed)) != NULL) \
1032 needed = p; \
1033 } else if (use_ldcache) { \
1034 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
1035 needed = p; \
1036 } \
1037 xstrcat(ret, needed, ret_len); \
1038 } \
1039 *found_needed = 1; \
1040 } else { \
1041 /* -N -> print matching entries */ \
1042 size_t n; \
1043 const char *find_lib_name; \
1044 \
1045 array_for_each(find_lib_arr, n, find_lib_name) { \
1046 int invert = 1; \
1047 if (find_lib_name[0] == '!') \
1048 invert = 0, ++find_lib_name; \
1049 if (!strcmp(find_lib_name, needed) == invert) \
1050 ++matched; \
1051 } \
1052 \
1053 if (matched == array_cnt(find_lib_arr)) { \
1054 *found_lib = 1; \
1055 return (be_wewy_wewy_quiet ? NULL : find_lib); \
1056 } \
1057 } \
1058 } \
1059 ++dyn; \
1060 } \
1061 } }
1062 SHOW_NEEDED(32)
1063 SHOW_NEEDED(64)
1064 if (op == 0 && !*found_needed && be_verbose)
1065 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
1066 }
1067
1068 return NULL;
1069 }
1070 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
1071 {
1072 void *strtbl_void;
1073
1074 if (!show_interp) return NULL;
1075
1076 strtbl_void = elf_findsecbyname(elf, ".interp");
1077
1078 if (strtbl_void) {
1079 #define SHOW_INTERP(B) \
1080 if (elf->elf_class == ELFCLASS ## B) { \
1081 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
1082 *found_interp = 1; \
1083 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
1084 }
1085 SHOW_INTERP(32)
1086 SHOW_INTERP(64)
1087 } else if (elf->phdr) {
1088 /* Walk all the program headers to find the PT_INTERP */
1089 #define SHOW_PT_INTERP(B) \
1090 if (elf->elf_class == ELFCLASS ## B) { \
1091 unsigned long i; \
1092 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1093 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1094 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1095 if (EGET(phdr[i].p_type) != PT_INTERP) \
1096 continue; \
1097 *found_interp = 1; \
1098 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(phdr[i].p_offset)); \
1099 } \
1100 }
1101 SHOW_PT_INTERP(32)
1102 SHOW_PT_INTERP(64)
1103 }
1104
1105 return NULL;
1106 }
1107 static const char *scanelf_file_bind(elfobj *elf, char *found_bind)
1108 {
1109 unsigned long i;
1110 struct stat s;
1111 bool dynamic = false;
1112
1113 if (!show_bind) return NULL;
1114 if (!elf->phdr) return NULL;
1115
1116 #define SHOW_BIND(B) \
1117 if (elf->elf_class == ELFCLASS ## B) { \
1118 Elf ## B ## _Dyn *dyn; \
1119 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1120 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1121 Elf ## B ## _Off offset; \
1122 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1123 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1124 dynamic = true; \
1125 offset = EGET(phdr[i].p_offset); \
1126 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
1127 dyn = DYN ## B (elf->vdata + offset); \
1128 while (EGET(dyn->d_tag) != DT_NULL) { \
1129 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
1130 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
1131 { \
1132 if (be_quiet) return NULL; \
1133 *found_bind = 1; \
1134 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
1135 } \
1136 ++dyn; \
1137 } \
1138 } \
1139 }
1140 SHOW_BIND(32)
1141 SHOW_BIND(64)
1142
1143 if (be_wewy_wewy_quiet) return NULL;
1144
1145 /* don't output anything if quiet mode and the ELF is static or not setuid */
1146 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
1147 return NULL;
1148 } else {
1149 *found_bind = 1;
1150 return dynamic ? "LAZY" : "STATIC";
1151 }
1152 }
1153 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
1154 {
1155 unsigned long i;
1156 char *soname;
1157 void *strtbl_void;
1158
1159 if (!show_soname) return NULL;
1160
1161 strtbl_void = elf_findsecbyname(elf, ".dynstr");
1162
1163 if (elf->phdr && strtbl_void) {
1164 #define SHOW_SONAME(B) \
1165 if (elf->elf_class == ELFCLASS ## B) { \
1166 Elf ## B ## _Dyn *dyn; \
1167 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1168 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1169 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
1170 Elf ## B ## _Off offset; \
1171 /* only look for soname in shared objects */ \
1172 if (EGET(ehdr->e_type) != ET_DYN) \
1173 return NULL; \
1174 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1175 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1176 offset = EGET(phdr[i].p_offset); \
1177 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
1178 dyn = DYN ## B (elf->vdata + offset); \
1179 while (EGET(dyn->d_tag) != DT_NULL) { \
1180 if (EGET(dyn->d_tag) == DT_SONAME) { \
1181 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
1182 if (offset >= (Elf ## B ## _Off)elf->len) { \
1183 ++dyn; \
1184 continue; \
1185 } \
1186 soname = elf->data + offset; \
1187 *found_soname = 1; \
1188 return (be_wewy_wewy_quiet ? NULL : soname); \
1189 } \
1190 ++dyn; \
1191 } \
1192 } }
1193 SHOW_SONAME(32)
1194 SHOW_SONAME(64)
1195 }
1196
1197 return NULL;
1198 }
1199
1200 /*
1201 * We support the symbol form:
1202 * [%[modifiers]%][[+-]<symbol name>][,[.....]]
1203 * If the symbol name is empty, then all symbols are matched.
1204 * If the symbol name is a glob ("*"), then all symbols are dumped (debug).
1205 * Do not rely on this output format at all.
1206 * Otherwise the symbol name is used to search (either regex or string compare).
1207 * If the first char of the symbol name is a plus ("+"), then only match
1208 * defined symbols. If it's a minus ("-"), only match undefined symbols.
1209 * Putting modifiers in between the percent signs allows for more in depth
1210 * filters. There are groups of modifiers. If you don't specify a member
1211 * of a group, then all types in that group are matched. The current
1212 * groups and their types are:
1213 * STT group: STT_NOTYPE:n STT_OBJECT:o STT_FUNC:f STT_FILE:F
1214 * STB group: STB_LOCAL:l STB_GLOBAL:g STB_WEAK:w
1215 * STV group: STV_DEFAULT:p STV_INTERNAL:i STV_HIDDEN:h STV_PROTECTED:P
1216 * SHN group: SHN_UNDEF:u SHN_ABS:a SHN_COMMON:c {defined}:d
1217 * The "defined" value in the SHN group does not correspond to a SHN_xxx define.
1218 * You can search for multiple symbols at once by seperating with a comma (",").
1219 *
1220 * Some examples:
1221 * ELFs with a weak function "foo":
1222 * scanelf -s %wf%foo <ELFs>
1223 * ELFs that define the symbol "main":
1224 * scanelf -s +main <ELFs>
1225 * scanelf -s %d%main <ELFs>
1226 * ELFs that refer to the undefined symbol "brk":
1227 * scanelf -s -brk <ELFs>
1228 * scanelf -s %u%brk <ELFs>
1229 * All global defined objects in an ELF:
1230 * scanelf -s %ogd% <ELF>
1231 */
1232 static void
1233 scanelf_match_symname(elfobj *elf, char *found_sym, char **ret, size_t *ret_len, const char *symname,
1234 unsigned int stt, unsigned int stb, unsigned int stv, unsigned int shn, unsigned long size)
1235 {
1236 const char *this_sym;
1237 size_t n;
1238
1239 array_for_each(find_sym_arr, n, this_sym) {
1240 bool inc_notype, inc_object, inc_func, inc_file,
1241 inc_local, inc_global, inc_weak,
1242 inc_visdef, inc_intern, inc_hidden, inc_prot,
1243 inc_def, inc_undef, inc_abs, inc_common;
1244
1245 /* symbol selection! */
1246 inc_notype = inc_object = inc_func = inc_file =
1247 inc_local = inc_global = inc_weak =
1248 inc_visdef = inc_intern = inc_hidden = inc_prot =
1249 inc_def = inc_undef = inc_abs = inc_common =
1250 (*this_sym != '%');
1251
1252 /* parse the contents of %...% */
1253 if (!inc_notype) {
1254 while (*(this_sym++)) {
1255 if (*this_sym == '%') {
1256 ++this_sym;
1257 break;
1258 }
1259 switch (*this_sym) {
1260 case 'n': inc_notype = true; break;
1261 case 'o': inc_object = true; break;
1262 case 'f': inc_func = true; break;
1263 case 'F': inc_file = true; break;
1264 case 'l': inc_local = true; break;
1265 case 'g': inc_global = true; break;
1266 case 'w': inc_weak = true; break;
1267 case 'p': inc_visdef = true; break;
1268 case 'i': inc_intern = true; break;
1269 case 'h': inc_hidden = true; break;
1270 case 'P': inc_prot = true; break;
1271 case 'd': inc_def = true; break;
1272 case 'u': inc_undef = true; break;
1273 case 'a': inc_abs = true; break;
1274 case 'c': inc_common = true; break;
1275 default: err("invalid symbol selector '%c'", *this_sym);
1276 }
1277 }
1278
1279 /* If no types are matched, not match all */
1280 if (!inc_notype && !inc_object && !inc_func && !inc_file)
1281 inc_notype = inc_object = inc_func = inc_file = true;
1282 if (!inc_local && !inc_global && !inc_weak)
1283 inc_local = inc_global = inc_weak = true;
1284 if (!inc_visdef && !inc_intern && !inc_hidden && !inc_prot)
1285 inc_visdef = inc_intern = inc_hidden = inc_prot = true;
1286 if (!inc_def && !inc_undef && !inc_abs && !inc_common)
1287 inc_def = inc_undef = inc_abs = inc_common = true;
1288
1289 /* backwards compat for defined/undefined short hand */
1290 } else if (*this_sym == '+') {
1291 inc_undef = false;
1292 ++this_sym;
1293 } else if (*this_sym == '-') {
1294 inc_def = inc_abs = inc_common = false;
1295 ++this_sym;
1296 }
1297
1298 /* filter symbols */
1299 if ((!inc_notype && stt == STT_NOTYPE ) || \
1300 (!inc_object && stt == STT_OBJECT ) || \
1301 (!inc_func && stt == STT_FUNC ) || \
1302 (!inc_file && stt == STT_FILE ) || \
1303 (!inc_local && stb == STB_LOCAL ) || \
1304 (!inc_global && stb == STB_GLOBAL ) || \
1305 (!inc_weak && stb == STB_WEAK ) || \
1306 (!inc_visdef && stv == STV_DEFAULT ) || \
1307 (!inc_intern && stv == STV_INTERNAL ) || \
1308 (!inc_hidden && stv == STV_HIDDEN ) || \
1309 (!inc_prot && stv == STV_PROTECTED) || \
1310 (!inc_def && shn && shn < SHN_LORESERVE) || \
1311 (!inc_undef && shn == SHN_UNDEF ) || \
1312 (!inc_abs && shn == SHN_ABS ) || \
1313 (!inc_common && shn == SHN_COMMON ))
1314 continue;
1315
1316 if (*this_sym == '*') {
1317 /* a "*" symbol gets you debug output */
1318 printf("%s(%s) %5lX %-15s %-15s %-15s %-15s %s\n",
1319 ((*found_sym == 0) ? "\n\t" : "\t"),
1320 elf->base_filename,
1321 size,
1322 get_elfstttype(stt),
1323 get_elfstbtype(stb),
1324 get_elfstvtype(stv),
1325 get_elfshntype(shn),
1326 symname);
1327 goto matched;
1328
1329 } else {
1330 if (g_match) {
1331 /* regex match the symbol */
1332 if (regexec(find_sym_regex_arr->eles[n], symname, 0, NULL, 0) == REG_NOMATCH)
1333 continue;
1334
1335 } else if (*this_sym) {
1336 /* give empty symbols a "pass", else do a normal compare */
1337 const size_t len = strlen(this_sym);
1338 if (!(strncmp(this_sym, symname, len) == 0 &&
1339 /* Accept unversioned symbol names */
1340 (symname[len] == '\0' || symname[len] == '@')))
1341 continue;
1342 }
1343
1344 if (be_semi_verbose) {
1345 char buf[1024];
1346 snprintf(buf, sizeof(buf), "%lX %s %s",
1347 size,
1348 get_elfstttype(stt),
1349 this_sym);
1350 *ret = xstrdup(buf);
1351 } else {
1352 if (*ret) xchrcat(ret, ',', ret_len);
1353 xstrcat(ret, symname, ret_len);
1354 }
1355
1356 goto matched;
1357 }
1358 }
1359
1360 return;
1361
1362 matched:
1363 *found_sym = 1;
1364 }
1365
1366 static const char *scanelf_file_sym(elfobj *elf, char *found_sym)
1367 {
1368 char *ret;
1369 void *symtab_void, *strtab_void;
1370
1371 if (!find_sym) return NULL;
1372 ret = NULL;
1373
1374 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
1375
1376 if (symtab_void && strtab_void) {
1377 #define FIND_SYM(B) \
1378 if (elf->elf_class == ELFCLASS ## B) { \
1379 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
1380 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
1381 Elf ## B ## _Sym *sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
1382 Elf ## B ## _Word i, cnt = EGET(symtab->sh_entsize); \
1383 char *symname; \
1384 size_t ret_len = 0; \
1385 if (cnt) \
1386 cnt = EGET(symtab->sh_size) / cnt; \
1387 for (i = 0; i < cnt; ++i) { \
1388 if ((void*)sym > elf->data_end) { \
1389 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1390 goto break_out; \
1391 } \
1392 if (sym->st_name) { \
1393 /* make sure the symbol name is in acceptable memory range */ \
1394 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
1395 if ((void*)symname > elf->data_end) { \
1396 warnf("%s: corrupt ELF symbols", elf->filename); \
1397 ++sym; \
1398 continue; \
1399 } \
1400 scanelf_match_symname(elf, found_sym, \
1401 &ret, &ret_len, symname, \
1402 ELF##B##_ST_TYPE(EGET(sym->st_info)), \
1403 ELF##B##_ST_BIND(EGET(sym->st_info)), \
1404 ELF##B##_ST_VISIBILITY(EGET(sym->st_other)), \
1405 EGET(sym->st_shndx), \
1406 /* st_size can be 64bit, but no one is really that big, so screw em */ \
1407 EGET(sym->st_size)); \
1408 } \
1409 ++sym; \
1410 } \
1411 }
1412 FIND_SYM(32)
1413 FIND_SYM(64)
1414 }
1415
1416 break_out:
1417 if (be_wewy_wewy_quiet) return NULL;
1418
1419 if (*find_sym != '*' && *found_sym)
1420 return ret;
1421 if (be_quiet)
1422 return NULL;
1423 else
1424 return " - ";
1425 }
1426
1427 static const char *scanelf_file_sections(elfobj *elf, char *found_section)
1428 {
1429 if (!find_section)
1430 return NULL;
1431
1432 #define FIND_SECTION(B) \
1433 if (elf->elf_class == ELFCLASS ## B) { \
1434 size_t matched, n; \
1435 int invert; \
1436 const char *section_name; \
1437 Elf ## B ## _Shdr *section; \
1438 \
1439 matched = 0; \
1440 array_for_each(find_section_arr, n, section_name) { \
1441 invert = (*section_name == '!' ? 1 : 0); \
1442 section = SHDR ## B (elf_findsecbyname(elf, section_name + invert)); \
1443 if ((section == NULL && invert) || (section != NULL && !invert)) \
1444 ++matched; \
1445 } \
1446 \
1447 if (matched == array_cnt(find_section_arr)) \
1448 *found_section = 1; \
1449 }
1450 FIND_SECTION(32)
1451 FIND_SECTION(64)
1452
1453 if (be_wewy_wewy_quiet)
1454 return NULL;
1455
1456 if (*found_section)
1457 return find_section;
1458
1459 if (be_quiet)
1460 return NULL;
1461 else
1462 return " - ";
1463 }
1464
1465 /* scan an elf file and show all the fun stuff */
1466 #define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
1467 static int scanelf_elfobj(elfobj *elf)
1468 {
1469 unsigned long i;
1470 char found_pax, found_phdr, found_relro, found_load, found_textrel,
1471 found_rpath, found_needed, found_interp, found_bind, found_soname,
1472 found_sym, found_lib, found_file, found_textrels, found_section;
1473 static char *out_buffer = NULL;
1474 static size_t out_len;
1475
1476 found_pax = found_phdr = found_relro = found_load = found_textrel = \
1477 found_rpath = found_needed = found_interp = found_bind = found_soname = \
1478 found_sym = found_lib = found_file = found_textrels = found_section = 0;
1479
1480 if (be_verbose > 2)
1481 printf("%s: scanning file {%s,%s}\n", elf->filename,
1482 get_elfeitype(EI_CLASS, elf->elf_class),
1483 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
1484 else if (be_verbose > 1)
1485 printf("%s: scanning file\n", elf->filename);
1486
1487 /* init output buffer */
1488 if (!out_buffer) {
1489 out_len = sizeof(char) * 80;
1490 out_buffer = xmalloc(out_len);
1491 }
1492 *out_buffer = '\0';
1493
1494 /* show the header */
1495 if (!be_quiet && show_banner) {
1496 for (i = 0; out_format[i]; ++i) {
1497 if (!IS_MODIFIER(out_format[i])) continue;
1498
1499 switch (out_format[++i]) {
1500 case '+': break;
1501 case '%': break;
1502 case '#': break;
1503 case 'F':
1504 case 'p':
1505 case 'f': prints("FILE "); found_file = 1; break;
1506 case 'o': prints(" TYPE "); break;
1507 case 'x': prints(" PAX "); break;
1508 case 'e': prints("STK/REL/PTL "); break;
1509 case 't': prints("TEXTREL "); break;
1510 case 'r': prints("RPATH "); break;
1511 case 'M': prints("CLASS "); break;
1512 case 'l':
1513 case 'n': prints("NEEDED "); break;
1514 case 'i': prints("INTERP "); break;
1515 case 'b': prints("BIND "); break;
1516 case 'Z': prints("SIZE "); break;
1517 case 'S': prints("SONAME "); break;
1518 case 's': prints("SYM "); break;
1519 case 'N': prints("LIB "); break;
1520 case 'T': prints("TEXTRELS "); break;
1521 case 'k': prints("SECTION "); break;
1522 case 'a': prints("ARCH "); break;
1523 case 'I': prints("OSABI "); break;
1524 case 'Y': prints("EABI "); break;
1525 case 'O': prints("PERM "); break;
1526 case 'D': prints("ENDIAN "); break;
1527 default: warnf("'%c' has no title ?", out_format[i]);
1528 }
1529 }
1530 if (!found_file) prints("FILE ");
1531 prints("\n");
1532 found_file = 0;
1533 show_banner = 0;
1534 }
1535
1536 /* dump all the good stuff */
1537 for (i = 0; out_format[i]; ++i) {
1538 const char *out;
1539 const char *tmp;
1540 static char ubuf[sizeof(unsigned long)*2];
1541 if (!IS_MODIFIER(out_format[i])) {
1542 xchrcat(&out_buffer, out_format[i], &out_len);
1543 continue;
1544 }
1545
1546 out = NULL;
1547 be_wewy_wewy_quiet = (out_format[i] == '#');
1548 be_semi_verbose = (out_format[i] == '+');
1549 switch (out_format[++i]) {
1550 case '+':
1551 case '%':
1552 case '#':
1553 xchrcat(&out_buffer, out_format[i], &out_len); break;
1554 case 'F':
1555 found_file = 1;
1556 if (be_wewy_wewy_quiet) break;
1557 xstrcat(&out_buffer, elf->filename, &out_len);
1558 break;
1559 case 'p':
1560 found_file = 1;
1561 if (be_wewy_wewy_quiet) break;
1562 tmp = elf->filename;
1563 if (search_path) {
1564 ssize_t len_search = strlen(search_path);
1565 ssize_t len_file = strlen(elf->filename);
1566 if (!strncmp(elf->filename, search_path, len_search) && \
1567 len_file > len_search)
1568 tmp += len_search;
1569 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1570 }
1571 xstrcat(&out_buffer, tmp, &out_len);
1572 break;
1573 case 'f':
1574 found_file = 1;
1575 if (be_wewy_wewy_quiet) break;
1576 tmp = strrchr(elf->filename, '/');
1577 tmp = (tmp == NULL ? elf->filename : tmp+1);
1578 xstrcat(&out_buffer, tmp, &out_len);
1579 break;
1580 case 'o': out = get_elfetype(elf); break;
1581 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
1582 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
1583 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1584 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
1585 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1586 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1587 case 'D': out = get_endian(elf); break;
1588 case 'O': out = strfileperms(elf->filename); break;
1589 case 'n':
1590 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
1591 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1592 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1593 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
1594 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1595 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1596 case 'a': out = get_elfemtype(elf); break;
1597 case 'I': out = get_elfosabi(elf); break;
1598 case 'Y': out = get_elf_eabi(elf); break;
1599 case 'Z': snprintf(ubuf, sizeof(ubuf), "%lu", (unsigned long)elf->len); out = ubuf; break;;
1600 default: warnf("'%c' has no scan code?", out_format[i]);
1601 }
1602 if (out)
1603 xstrcat(&out_buffer, out, &out_len);
1604 }
1605
1606 #define FOUND_SOMETHING() \
1607 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1608 found_rpath || found_needed || found_interp || found_bind || \
1609 found_soname || found_sym || found_lib || found_textrels || found_section )
1610
1611 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1612 xchrcat(&out_buffer, ' ', &out_len);
1613 xstrcat(&out_buffer, elf->filename, &out_len);
1614 }
1615 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
1616 puts(out_buffer);
1617 fflush(stdout);
1618 }
1619
1620 return 0;
1621 }
1622
1623 /* scan a single elf */
1624 static int scanelf_elf(const char *filename, int fd, size_t len)
1625 {
1626 int ret = 1;
1627 size_t n;
1628 const char *match_etype;
1629 elfobj *elf;
1630
1631 /* Verify this is a real ELF */
1632 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1633 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1634 return 2;
1635 }
1636
1637 /* Possibly filter based on ELF bitness */
1638 switch (match_bits) {
1639 case 32:
1640 if (elf->elf_class != ELFCLASS32)
1641 goto done;
1642 break;
1643 case 64:
1644 if (elf->elf_class != ELFCLASS64)
1645 goto done;
1646 break;
1647 }
1648
1649 /* Possibly filter based on the ELF's e_type field */
1650 array_for_each(match_etypes, n, match_etype)
1651 if (etype_lookup(match_etype) == get_etype(elf))
1652 goto scanit;
1653 if (array_cnt(match_etypes))
1654 goto done;
1655
1656 scanit:
1657 ret = scanelf_elfobj(elf);
1658
1659 done:
1660 unreadelf(elf);
1661 return ret;
1662 }
1663
1664 /* scan an archive of elfs */
1665 static int scanelf_archive(const char *filename, int fd, size_t len)
1666 {
1667 archive_handle *ar;
1668 archive_member *m;
1669 char *ar_buffer;
1670 elfobj *elf;
1671
1672 ar = ar_open_fd(filename, fd);
1673 if (ar == NULL)
1674 return 1;
1675
1676 ar_buffer = mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1677 while ((m = ar_next(ar)) != NULL) {
1678 off_t cur_pos = lseek(fd, 0, SEEK_CUR);
1679 if (cur_pos == -1)
1680 errp("lseek() failed");
1681 elf = readelf_buffer(m->name, ar_buffer + cur_pos, m->size);
1682 if (elf) {
1683 scanelf_elfobj(elf);
1684 unreadelf(elf);
1685 }
1686 }
1687 munmap(ar_buffer, len);
1688
1689 return 0;
1690 }
1691 /* scan a file which may be an elf or an archive or some other magical beast */
1692 static int scanelf_fileat(int dir_fd, const char *filename, const struct stat *st_cache)
1693 {
1694 const struct stat *st = st_cache;
1695 struct stat symlink_st;
1696 int fd;
1697
1698 /* always handle regular files and handle symlinked files if no -y */
1699 if (S_ISLNK(st->st_mode)) {
1700 if (!scan_symlink)
1701 return 1;
1702 fstatat(dir_fd, filename, &symlink_st, 0);
1703 st = &symlink_st;
1704 }
1705
1706 if (!S_ISREG(st->st_mode)) {
1707 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1708 return 1;
1709 }
1710
1711 if (match_perms) {
1712 if ((st->st_mode | match_perms) != st->st_mode)
1713 return 1;
1714 }
1715 fd = openat(dir_fd, filename, (fix_elf ? O_RDWR : O_RDONLY) | O_CLOEXEC);
1716 if (fd == -1) {
1717 if (fix_elf && errno == ETXTBSY)
1718 warnp("%s: could not fix", filename);
1719 else if (be_verbose > 2)
1720 printf("%s: skipping file: %s\n", filename, strerror(errno));
1721 return 1;
1722 }
1723
1724 if (scanelf_elf(filename, fd, st->st_size) == 2) {
1725 /* if it isn't an ELF, maybe it's an .a archive */
1726 if (scan_archives)
1727 scanelf_archive(filename, fd, st->st_size);
1728
1729 /*
1730 * unreadelf() implicitly closes its fd, so only close it
1731 * when we are returning it in the non-ELF case
1732 */
1733 close(fd);
1734 }
1735
1736 return 0;
1737 }
1738
1739 /* scan a directory for ET_EXEC files and print when we find one */
1740 static int scanelf_dirat(int dir_fd, const char *path)
1741 {
1742 register DIR *dir;
1743 register struct dirent *dentry;
1744 struct stat st_top, st;
1745 char buf[__PAX_UTILS_PATH_MAX], *subpath;
1746 size_t pathlen = 0, len = 0;
1747 int ret = 0;
1748 int subdir_fd;
1749
1750 /* make sure path exists */
1751 if (fstatat(dir_fd, path, &st_top, AT_SYMLINK_NOFOLLOW) == -1) {
1752 if (be_verbose > 2) printf("%s: does not exist\n", path);
1753 return 1;
1754 }
1755
1756 /* ok, if it isn't a directory, assume we can open it */
1757 if (!S_ISDIR(st_top.st_mode))
1758 return scanelf_fileat(dir_fd, path, &st_top);
1759
1760 /* now scan the dir looking for fun stuff */
1761 subdir_fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
1762 if (subdir_fd == -1)
1763 dir = NULL;
1764 else
1765 dir = fdopendir(subdir_fd);
1766 if (dir == NULL) {
1767 if (subdir_fd != -1)
1768 close(subdir_fd);
1769 else if (be_verbose > 2)
1770 printf("%s: skipping dir: %s\n", path, strerror(errno));
1771 return 1;
1772 }
1773 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1774
1775 subpath = stpcpy(buf, path);
1776 if (subpath[-1] != '/')
1777 *subpath++ = '/';
1778 pathlen = subpath - buf;
1779 while ((dentry = readdir(dir))) {
1780 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1781 continue;
1782
1783 if (fstatat(subdir_fd, dentry->d_name, &st, AT_SYMLINK_NOFOLLOW) == -1)
1784 continue;
1785
1786 len = strlen(dentry->d_name);
1787 if (len + pathlen + 1 >= sizeof(buf)) {
1788 warnf("Skipping '%s%s': len > sizeof(buf); %zu > %zu\n",
1789 path, dentry->d_name, len + pathlen + 1, sizeof(buf));
1790 continue;
1791 }
1792 memcpy(subpath, dentry->d_name, len);
1793 subpath[len] = '\0';
1794
1795 if (S_ISREG(st.st_mode))
1796 ret = scanelf_fileat(dir_fd, buf, &st);
1797 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1798 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1799 ret = scanelf_dirat(dir_fd, buf);
1800 }
1801 }
1802 closedir(dir);
1803
1804 return ret;
1805 }
1806 static int scanelf_dir(const char *path)
1807 {
1808 return scanelf_dirat(root_fd, root_rel_path(path));
1809 }
1810
1811 static int scanelf_from_file(const char *filename)
1812 {
1813 FILE *fp;
1814 char *p, *path;
1815 size_t len;
1816 int ret;
1817
1818 if (strcmp(filename, "-") == 0)
1819 fp = stdin;
1820 else if ((fp = fopen(filename, "r")) == NULL)
1821 return 1;
1822
1823 path = NULL;
1824 len = 0;
1825 ret = 0;
1826 while (getline(&path, &len, fp) != -1) {
1827 if ((p = strchr(path, '\n')) != NULL)
1828 *p = 0;
1829 search_path = path;
1830 ret = scanelf_dir(path);
1831 }
1832 free(path);
1833
1834 if (fp != stdin)
1835 fclose(fp);
1836
1837 return ret;
1838 }
1839
1840 #if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1841
1842 static int _load_ld_cache_config(const char *fname)
1843 {
1844 FILE *fp = NULL;
1845 char *p, *path;
1846 size_t len;
1847 int curr_fd = -1;
1848
1849 fp = fopenat_r(root_fd, root_rel_path(fname));
1850 if (fp == NULL)
1851 return -1;
1852
1853 path = NULL;
1854 len = 0;
1855 while (getline(&path, &len, fp) != -1) {
1856 if ((p = strrchr(path, '\r')) != NULL)
1857 *p = 0;
1858 if ((p = strchr(path, '\n')) != NULL)
1859 *p = 0;
1860
1861 /* recursive includes of the same file will make this segfault. */
1862 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1863 glob_t gl;
1864 size_t x;
1865 const char *gpath;
1866
1867 /* re-use existing path buffer ... need to be creative */
1868 if (path[8] != '/')
1869 gpath = memcpy(path + 3, "/etc/", 5);
1870 else
1871 gpath = path + 8;
1872 if (root_fd != AT_FDCWD) {
1873 if (curr_fd == -1) {
1874 curr_fd = open(".", O_RDONLY|O_CLOEXEC);
1875 if (fchdir(root_fd))
1876 errp("unable to change to root dir");
1877 }
1878 gpath = root_rel_path(gpath);
1879 }
1880
1881 if (glob(gpath, 0, NULL, &gl) == 0) {
1882 for (x = 0; x < gl.gl_pathc; ++x) {
1883 /* try to avoid direct loops */
1884 if (strcmp(gl.gl_pathv[x], fname) == 0)
1885 continue;
1886 _load_ld_cache_config(gl.gl_pathv[x]);
1887 }
1888 globfree(&gl);
1889 }
1890
1891 /* failed globs are ignored by glibc */
1892 continue;
1893 }
1894
1895 if (*path != '/')
1896 continue;
1897
1898 xarraypush_str(ldpaths, path);
1899 }
1900 free(path);
1901
1902 fclose(fp);
1903
1904 if (curr_fd != -1) {
1905 if (fchdir(curr_fd))
1906 {/* don't care */}
1907 close(curr_fd);
1908 }
1909
1910 return 0;
1911 }
1912
1913 #elif defined(__FreeBSD__) || defined(__DragonFly__)
1914
1915 static int _load_ld_cache_config(const char *fname)
1916 {
1917 FILE *fp = NULL;
1918 char *b = NULL, *p;
1919 struct elfhints_hdr hdr;
1920
1921 fp = fopenat_r(root_fd, root_rel_path(fname));
1922 if (fp == NULL)
1923 return -1;
1924
1925 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1926 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1927 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1928 {
1929 fclose(fp);
1930 return -1;
1931 }
1932
1933 b = xmalloc(hdr.dirlistlen + 1);
1934 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1935 fclose(fp);
1936 free(b);
1937 return -1;
1938 }
1939
1940 while ((p = strsep(&b, ":"))) {
1941 if (*p == '\0')
1942 continue;
1943 xarraypush_str(ldpaths, p);
1944 }
1945
1946 free(b);
1947 fclose(fp);
1948 return 0;
1949 }
1950
1951 #else
1952 #ifdef __ELF__
1953 #warning Cache config support not implemented for your target
1954 #endif
1955 static int _load_ld_cache_config(const char *fname)
1956 {
1957 return 0;
1958 }
1959 #endif
1960
1961 static void load_ld_cache_config(const char *fname)
1962 {
1963 bool scan_l, scan_ul, scan_ull;
1964 size_t n;
1965 const char *ldpath;
1966
1967 _load_ld_cache_config(fname);
1968
1969 scan_l = scan_ul = scan_ull = false;
1970 array_for_each(ldpaths, n, ldpath) {
1971 if (!scan_l && !strcmp(ldpath, "/lib")) scan_l = true;
1972 if (!scan_ul && !strcmp(ldpath, "/usr/lib")) scan_ul = true;
1973 if (!scan_ull && !strcmp(ldpath, "/usr/local/lib")) scan_ull = true;
1974 }
1975
1976 if (!scan_l) xarraypush_str(ldpaths, "/lib");
1977 if (!scan_ul) xarraypush_str(ldpaths, "/usr/lib");
1978 if (!scan_ull) xarraypush_str(ldpaths, "/usr/local/lib");
1979 }
1980
1981 /* scan /etc/ld.so.conf for paths */
1982 static void scanelf_ldpath(void)
1983 {
1984 size_t n;
1985 const char *ldpath;
1986
1987 array_for_each(ldpaths, n, ldpath)
1988 scanelf_dir(ldpath);
1989 }
1990
1991 /* scan env PATH for paths */
1992 static void scanelf_envpath(void)
1993 {
1994 char *path, *p;
1995
1996 path = getenv("PATH");
1997 if (!path)
1998 err("PATH is not set in your env !");
1999 path = xstrdup(path);
2000
2001 while ((p = strrchr(path, ':')) != NULL) {
2002 scanelf_dir(p + 1);
2003 *p = 0;
2004 }
2005
2006 free(path);
2007 }
2008
2009 /* usage / invocation handling functions */ /* Free Flags: c d j u w G H J K P Q U W */
2010 #define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZCBhV"
2011 #define a_argument required_argument
2012 static struct option const long_opts[] = {
2013 {"path", no_argument, NULL, 'p'},
2014 {"ldpath", no_argument, NULL, 'l'},
2015 {"use-ldpath",no_argument, NULL, 129},
2016 {"root", a_argument, NULL, 128},
2017 {"recursive", no_argument, NULL, 'R'},
2018 {"mount", no_argument, NULL, 'm'},
2019 {"symlink", no_argument, NULL, 'y'},
2020 {"archives", no_argument, NULL, 'A'},
2021 {"ldcache", no_argument, NULL, 'L'},
2022 {"fix", no_argument, NULL, 'X'},
2023 {"setpax", a_argument, NULL, 'z'},
2024 {"pax", no_argument, NULL, 'x'},
2025 {"header", no_argument, NULL, 'e'},
2026 {"textrel", no_argument, NULL, 't'},
2027 {"rpath", no_argument, NULL, 'r'},
2028 {"needed", no_argument, NULL, 'n'},
2029 {"interp", no_argument, NULL, 'i'},
2030 {"bind", no_argument, NULL, 'b'},
2031 {"soname", no_argument, NULL, 'S'},
2032 {"symbol", a_argument, NULL, 's'},
2033 {"section", a_argument, NULL, 'k'},
2034 {"lib", a_argument, NULL, 'N'},
2035 {"gmatch", no_argument, NULL, 'g'},
2036 {"textrels", no_argument, NULL, 'T'},
2037 {"etype", a_argument, NULL, 'E'},
2038 {"bits", a_argument, NULL, 'M'},
2039 {"endian", no_argument, NULL, 'D'},
2040 {"osabi", no_argument, NULL, 'I'},
2041 {"eabi", no_argument, NULL, 'Y'},
2042 {"perms", a_argument, NULL, 'O'},
2043 {"size", no_argument, NULL, 'Z'},
2044 {"all", no_argument, NULL, 'a'},
2045 {"quiet", no_argument, NULL, 'q'},
2046 {"verbose", no_argument, NULL, 'v'},
2047 {"format", a_argument, NULL, 'F'},
2048 {"from", a_argument, NULL, 'f'},
2049 {"file", a_argument, NULL, 'o'},
2050 {"nocolor", no_argument, NULL, 'C'},
2051 {"nobanner", no_argument, NULL, 'B'},
2052 {"help", no_argument, NULL, 'h'},
2053 {"version", no_argument, NULL, 'V'},
2054 {NULL, no_argument, NULL, 0x0}
2055 };
2056
2057 static const char * const opts_help[] = {
2058 "Scan all directories in PATH environment",
2059 "Scan all directories in /etc/ld.so.conf",
2060 "Use ld.so.conf to show full path (use with -r/-n)",
2061 "Root directory (use with -l or -p)",
2062 "Scan directories recursively",
2063 "Don't recursively cross mount points",
2064 "Don't scan symlinks",
2065 "Scan archives (.a files)",
2066 "Utilize ld.so.cache to show full path (use with -r/-n)",
2067 "Try and 'fix' bad things (use with -r/-e)",
2068 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
2069 "Print PaX markings",
2070 "Print GNU_STACK/PT_LOAD markings",
2071 "Print TEXTREL information",
2072 "Print RPATH information",
2073 "Print NEEDED information",
2074 "Print INTERP information",
2075 "Print BIND information",
2076 "Print SONAME information",
2077 "Find a specified symbol",
2078 "Find a specified section",
2079 "Find a specified library",
2080 "Use regex rather than string compare (with -s); specify twice for case insensitive",
2081 "Locate cause of TEXTREL",
2082 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
2083 "Print only ELF files matching numeric bits",
2084 "Print Endianness",
2085 "Print OSABI",
2086 "Print EABI (EM_ARM Only)",
2087 "Print only ELF files matching octal permissions",
2088 "Print ELF file size",
2089 "Print all useful/simple info\n",
2090 "Only output 'bad' things",
2091 "Be verbose (can be specified more than once)",
2092 "Use specified format for output",
2093 "Read input stream from a filename",
2094 "Write output stream to a filename",
2095 "Don't emit color in output",
2096 "Don't display the header",
2097 "Print this help and exit",
2098 "Print version and exit",
2099 NULL
2100 };
2101
2102 /* display usage and exit */
2103 static void usage(int status)
2104 {
2105 const char a_arg[] = "<arg>";
2106 size_t a_arg_len = strlen(a_arg) + 2;
2107 size_t i;
2108 int optlen;
2109 printf("* Scan ELF binaries for stuff\n\n"
2110 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
2111 printf("Options: -[%s]\n", PARSE_FLAGS);
2112
2113 /* prescan the --long opt length to auto-align */
2114 optlen = 0;
2115 for (i = 0; long_opts[i].name; ++i) {
2116 int l = strlen(long_opts[i].name);
2117 if (long_opts[i].has_arg == a_argument)
2118 l += a_arg_len;
2119 optlen = max(l, optlen);
2120 }
2121
2122 for (i = 0; long_opts[i].name; ++i) {
2123 /* first output the short flag if it has one */
2124 if (long_opts[i].val > '~')
2125 printf(" ");
2126 else
2127 printf(" -%c, ", long_opts[i].val);
2128
2129 /* then the long flag */
2130 if (long_opts[i].has_arg == no_argument)
2131 printf("--%-*s", optlen, long_opts[i].name);
2132 else
2133 printf("--%s %s %*s", long_opts[i].name, a_arg,
2134 (int)(optlen - strlen(long_opts[i].name) - a_arg_len), "");
2135
2136 /* finally the help text */
2137 printf("* %s\n", opts_help[i]);
2138 }
2139
2140 puts("\nFor more information, see the scanelf(1) manpage");
2141 exit(status);
2142 }
2143
2144 /* parse command line arguments and preform needed actions */
2145 #define do_pax_state(option, flag) \
2146 if (islower(option)) { \
2147 flags &= ~PF_##flag; \
2148 flags |= PF_NO##flag; \
2149 } else { \
2150 flags &= ~PF_NO##flag; \
2151 flags |= PF_##flag; \
2152 }
2153 static void parse_delimited(array_t *arr, char *arg, const char *delim)
2154 {
2155 char *ele = strtok(arg, delim);
2156 if (!ele) /* edge case: -s '' */
2157 xarraypush_str(arr, "");
2158 while (ele) {
2159 xarraypush_str(arr, ele);
2160 ele = strtok(NULL, delim);
2161 }
2162 }
2163 static int parseargs(int argc, char *argv[])
2164 {
2165 int i;
2166 const char *from_file = NULL;
2167 int ret = 0;
2168 char load_cache_config = 0;
2169
2170 opterr = 0;
2171 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
2172 switch (i) {
2173
2174 case 'V':
2175 printf("pax-utils-%s: %s\n%s\n"
2176 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
2177 VERSION, __FILE__, rcsid, argv0);
2178 exit(EXIT_SUCCESS);
2179 break;
2180 case 'h': usage(EXIT_SUCCESS); break;
2181 case 'f':
2182 if (from_file) warn("You prob don't want to specify -f twice");
2183 from_file = optarg;
2184 break;
2185 case 'E':
2186 /* historically, this was comma delimited */
2187 parse_delimited(match_etypes, optarg, ",");
2188 break;
2189 case 'M':
2190 match_bits = atoi(optarg);
2191 if (match_bits == 0) {
2192 if (strcmp(optarg, "ELFCLASS32") == 0)
2193 match_bits = 32;
2194 if (strcmp(optarg, "ELFCLASS64") == 0)
2195 match_bits = 64;
2196 }
2197 break;
2198 case 'O':
2199 if (sscanf(optarg, "%o", &match_perms) == -1)
2200 match_bits = 0;
2201 break;
2202 case 'o': {
2203 if (freopen(optarg, "w", stdout) == NULL)
2204 errp("Could not freopen(%s)", optarg);
2205 break;
2206 }
2207 case 'k':
2208 xarraypush_str(find_section_arr, optarg);
2209 break;
2210 case 's':
2211 /* historically, this was comma delimited */
2212 parse_delimited(find_sym_arr, optarg, ",");
2213 break;
2214 case 'N':
2215 xarraypush_str(find_lib_arr, optarg);
2216 break;
2217 case 'F': {
2218 if (out_format) warn("You prob don't want to specify -F twice");
2219 out_format = optarg;
2220 break;
2221 }
2222 case 'z': {
2223 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
2224 size_t x;
2225
2226 for (x = 0; x < strlen(optarg); x++) {
2227 switch (optarg[x]) {
2228 case 'p':
2229 case 'P':
2230 do_pax_state(optarg[x], PAGEEXEC);
2231 break;
2232 case 's':
2233 case 'S':
2234 do_pax_state(optarg[x], SEGMEXEC);
2235 break;
2236 case 'm':
2237 case 'M':
2238 do_pax_state(optarg[x], MPROTECT);
2239 break;
2240 case 'e':
2241 case 'E':
2242 do_pax_state(optarg[x], EMUTRAMP);
2243 break;
2244 case 'r':
2245 case 'R':
2246 do_pax_state(optarg[x], RANDMMAP);
2247 break;
2248 case 'x':
2249 case 'X':
2250 do_pax_state(optarg[x], RANDEXEC);
2251 break;
2252 default:
2253 break;
2254 }
2255 }
2256 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
2257 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
2258 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
2259 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
2260 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
2261 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
2262 setpax = flags;
2263 break;
2264 }
2265 case 'Z': show_size = 1; break;
2266 case 'g': ++g_match; break;
2267 case 'L': load_cache_config = use_ldcache = 1; break;
2268 case 'y': scan_symlink = 0; break;
2269 case 'A': scan_archives = 1; break;
2270 case 'C': color_init(true); break;
2271 case 'B': show_banner = 0; break;
2272 case 'l': load_cache_config = scan_ldpath = 1; break;
2273 case 'p': scan_envpath = 1; break;
2274 case 'R': dir_recurse = 1; break;
2275 case 'm': dir_crossmount = 0; break;
2276 case 'X': ++fix_elf; break;
2277 case 'x': show_pax = 1; break;
2278 case 'e': show_phdr = 1; break;
2279 case 't': show_textrel = 1; break;
2280 case 'r': show_rpath = 1; break;
2281 case 'n': show_needed = 1; break;
2282 case 'i': show_interp = 1; break;
2283 case 'b': show_bind = 1; break;
2284 case 'S': show_soname = 1; break;
2285 case 'T': show_textrels = 1; break;
2286 case 'q': be_quiet = min(be_quiet, 20) + 1; break;
2287 case 'v': be_verbose = min(be_verbose, 20) + 1; break;
2288 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
2289 case 'D': show_endian = 1; break;
2290 case 'I': show_osabi = 1; break;
2291 case 'Y': show_eabi = 1; break;
2292 case 128:
2293 root_fd = open(optarg, O_RDONLY|O_CLOEXEC);
2294 if (root_fd == -1)
2295 err("Could not open root: %s", optarg);
2296 break;
2297 case 129: load_cache_config = use_ldpath = 1; break;
2298 case ':':
2299 err("Option '%c' is missing parameter", optopt);
2300 case '?':
2301 err("Unknown option '%c' or argument missing", optopt);
2302 default:
2303 err("Unhandled option '%c'; please report this", i);
2304 }
2305 }
2306 if (show_textrels && be_verbose)
2307 objdump = which("objdump", "OBJDUMP");
2308 /* precompile all the regexes */
2309 if (g_match) {
2310 regex_t preg;
2311 const char *this_sym;
2312 size_t n;
2313 int flags = REG_EXTENDED | REG_NOSUB | (g_match > 1 ? REG_ICASE : 0);
2314
2315 array_for_each(find_sym_arr, n, this_sym) {
2316 /* see scanelf_match_symname for logic info */
2317 switch (this_sym[0]) {
2318 case '%':
2319 while (*(this_sym++))
2320 if (*this_sym == '%') {
2321 ++this_sym;
2322 break;
2323 }
2324 break;
2325 case '+':
2326 case '-':
2327 ++this_sym;
2328 break;
2329 }
2330 if (*this_sym == '*')
2331 ++this_sym;
2332
2333 ret = regcomp(&preg, this_sym, flags);
2334 if (ret) {
2335 char err[256];
2336 regerror(ret, &preg, err, sizeof(err));
2337 err("regcomp of %s failed: %s", this_sym, err);
2338 }
2339 xarraypush(find_sym_regex_arr, &preg, sizeof(preg));
2340 }
2341 }
2342 /* flatten arrays for display */
2343 find_sym = array_flatten_str(find_sym_arr);
2344 find_lib = array_flatten_str(find_lib_arr);
2345 find_section = array_flatten_str(find_section_arr);
2346 /* let the format option override all other options */
2347 if (out_format) {
2348 show_pax = show_phdr = show_textrel = show_rpath = \
2349 show_needed = show_interp = show_bind = show_soname = \
2350 show_textrels = show_perms = show_endian = show_size = \
2351 show_osabi = show_eabi = 0;
2352 for (i = 0; out_format[i]; ++i) {
2353 if (!IS_MODIFIER(out_format[i])) continue;
2354
2355 switch (out_format[++i]) {
2356 case '+': break;
2357 case '%': break;
2358 case '#': break;
2359 case 'F': break;
2360 case 'p': break;
2361 case 'f': break;
2362 case 'k': break;
2363 case 's': break;
2364 case 'N': break;
2365 case 'o': break;
2366 case 'a': break;
2367 case 'M': break;
2368 case 'Z': show_size = 1; break;
2369 case 'D': show_endian = 1; break;
2370 case 'I': show_osabi = 1; break;
2371 case 'Y': show_eabi = 1; break;
2372 case 'O': show_perms = 1; break;
2373 case 'x': show_pax = 1; break;
2374 case 'e': show_phdr = 1; break;
2375 case 't': show_textrel = 1; break;
2376 case 'r': show_rpath = 1; break;
2377 case 'n': show_needed = 1; break;
2378 case 'i': show_interp = 1; break;
2379 case 'b': show_bind = 1; break;
2380 case 'S': show_soname = 1; break;
2381 case 'T': show_textrels = 1; break;
2382 default:
2383 err("invalid format specifier '%c' (byte %i)",
2384 out_format[i], i+1);
2385 }
2386 }
2387
2388 /* construct our default format */
2389 } else {
2390 size_t fmt_len = 30;
2391 out_format = xmalloc(sizeof(char) * fmt_len);
2392 *out_format = '\0';
2393 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
2394 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
2395 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
2396 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
2397 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
2398 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
2399 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
2400 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
2401 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
2402 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
2403 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
2404 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
2405 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
2406 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
2407 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
2408 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
2409 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
2410 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
2411 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
2412 }
2413 if (be_verbose > 2) printf("Format: %s\n", out_format);
2414
2415 /* now lets actually do the scanning */
2416 if (load_cache_config)
2417 load_ld_cache_config(__PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
2418 if (scan_ldpath) scanelf_ldpath();
2419 if (scan_envpath) scanelf_envpath();
2420 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
2421 from_file = "-";
2422 if (from_file) {
2423 scanelf_from_file(from_file);
2424 from_file = *argv;
2425 }
2426 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
2427 err("Nothing to scan !?");
2428 while (optind < argc) {
2429 search_path = argv[optind++];
2430 ret = scanelf_dir(search_path);
2431 }
2432
2433 #ifdef __PAX_UTILS_CLEANUP
2434 /* clean up */
2435 xarrayfree(ldpaths);
2436 xarrayfree(find_sym_arr);
2437 xarrayfree(find_lib_arr);
2438 xarrayfree(find_section_arr);
2439 free(find_sym);
2440 free(find_lib);
2441 free(find_section);
2442 {
2443 size_t n;
2444 regex_t *preg;
2445 array_for_each(find_sym_regex_arr, n, preg)
2446 regfree(preg);
2447 xarrayfree(find_sym_regex_arr);
2448 }
2449
2450 if (ldcache != 0)
2451 munmap(ldcache, ldcache_size);
2452 #endif
2453
2454 return ret;
2455 }
2456
2457 static char **get_split_env(const char *envvar)
2458 {
2459 const char *delims = " \t\n";
2460 char **envvals = NULL;
2461 char *env, *s;
2462 int nentry;
2463
2464 if ((env = getenv(envvar)) == NULL)
2465 return NULL;
2466
2467 env = xstrdup(env);
2468 if (env == NULL)
2469 return NULL;
2470
2471 s = strtok(env, delims);
2472 if (s == NULL) {
2473 free(env);
2474 return NULL;
2475 }
2476
2477 nentry = 0;
2478 while (s != NULL) {
2479 ++nentry;
2480 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
2481 envvals[nentry-1] = s;
2482 s = strtok(NULL, delims);
2483 }
2484 envvals[nentry] = NULL;
2485
2486 /* don't want to free(env) as it contains the memory that backs
2487 * the envvals array of strings */
2488 return envvals;
2489 }
2490
2491 static void parseenv(void)
2492 {
2493 color_init(false);
2494 qa_textrels = get_split_env("QA_TEXTRELS");
2495 qa_execstack = get_split_env("QA_EXECSTACK");
2496 qa_wx_load = get_split_env("QA_WX_LOAD");
2497 }
2498
2499 #ifdef __PAX_UTILS_CLEANUP
2500 static void cleanup(void)
2501 {
2502 free(out_format);
2503 free(qa_textrels);
2504 free(qa_execstack);
2505 free(qa_wx_load);
2506 }
2507 #endif
2508
2509 int main(int argc, char *argv[])
2510 {
2511 int ret;
2512 if (argc < 2)
2513 usage(EXIT_FAILURE);
2514 parseenv();
2515 ret = parseargs(argc, argv);
2516 fclose(stdout);
2517 #ifdef __PAX_UTILS_CLEANUP
2518 cleanup();
2519 warn("The calls to add/delete heap should be off:\n"
2520 "\t- 1 due to the out_buffer not being freed in scanelf_fileat()\n"
2521 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
2522 #endif
2523 return ret;
2524 }
2525
2526 /* Match filename against entries in matchlist, return TRUE
2527 * if the file is listed */
2528 static int file_matches_list(const char *filename, char **matchlist)
2529 {
2530 char **file;
2531 char *match;
2532 char buf[__PAX_UTILS_PATH_MAX];
2533
2534 if (matchlist == NULL)
2535 return 0;
2536
2537 for (file = matchlist; *file != NULL; file++) {
2538 if (search_path) {
2539 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2540 match = buf;
2541 } else {
2542 match = *file;
2543 }
2544 if (fnmatch(match, filename, 0) == 0)
2545 return 1;
2546 }
2547 return 0;
2548 }

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