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Revision 1.264 - (show annotations) (download) (as text)
Fri Mar 21 05:27:21 2014 UTC (5 years, 1 month ago) by vapier
Branch: MAIN
Changes since 1.263: +60 -19 lines
File MIME type: text/x-csrc
rewrite which() so that it works and does not break $PATH

we were walking the $PATH in reverse which it should have been forwards.  we were also modifying the pointer we got back from getenv() which meant any time we ran external code, $PATH would be truncated.  finally, we never actually checked the first element -- we would bail before we got a chance.

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 1.263 2014/03/20 08:08:37 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 1.263 2014/03/20 08:08:37 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 */
76 static const char *which(const char *fname, const char *envvar)
77 {
78 size_t path_len, fname_len;
79 const char *env_path;
80 char *path, *p, *ep;
81
82 p = getenv(envvar);
83 if (p)
84 return p;
85
86 env_path = getenv("PATH");
87 if (!env_path)
88 return NULL;
89
90 /* Create a copy of the $PATH that we can safely modify.
91 * Make it a little bigger so we can append "/fname".
92 * We do this twice -- once for a perm copy, and once for
93 * room at the end of the last element. */
94 path_len = strlen(env_path);
95 fname_len = strlen(fname);
96 path = xmalloc(path_len + (fname_len * 2) + 2 + 2);
97 memcpy(path, env_path, path_len + 1);
98
99 p = path + path_len + 1 + fname_len + 1;
100 *p = '/';
101 memcpy(p + 1, fname, fname_len + 1);
102
103 /* Repoint fname to the copy in the env string as it has
104 * the leading slash which we can include in a single memcpy.
105 * Increase the fname len to include the '/' and '\0'. */
106 fname = p;
107 fname_len += 2;
108
109 p = path;
110 while (p) {
111 ep = strchr(p, ':');
112 /* Append the /foo path to the current element. */
113 if (ep)
114 memcpy(ep, fname, fname_len);
115 else
116 memcpy(path + path_len, fname, fname_len);
117
118 if (access(p, R_OK) != -1)
119 return p;
120
121 p = ep;
122 if (ep) {
123 /* If not the last element, restore the chunk we clobbered. */
124 size_t offset = ep - path;
125 size_t restore = min(path_len - offset, fname_len);
126 memcpy(ep, env_path + offset, restore);
127 ++p;
128 }
129 }
130
131 free(path);
132 return NULL;
133 }
134
135 static FILE *fopenat_r(int dir_fd, const char *path)
136 {
137 int fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
138 if (fd == -1)
139 return NULL;
140 return fdopen(fd, "re");
141 }
142
143 static const char *root_rel_path(const char *path)
144 {
145 /*
146 * openat() will ignore the dirfd if path starts with
147 * a /, so consume all of that noise
148 *
149 * XXX: we don't handle relative paths like ../ that
150 * break out of the --root option, but for now, just
151 * don't do that :P.
152 */
153 if (root_fd != AT_FDCWD) {
154 while (*path == '/')
155 ++path;
156 if (*path == '\0')
157 path = ".";
158 }
159
160 return path;
161 }
162
163 /* sub-funcs for scanelf_fileat() */
164 static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **str)
165 {
166 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
167
168 /* debug sections */
169 void *symtab = elf_findsecbyname(elf, ".symtab");
170 void *strtab = elf_findsecbyname(elf, ".strtab");
171 /* runtime sections */
172 void *dynsym = elf_findsecbyname(elf, ".dynsym");
173 void *dynstr = elf_findsecbyname(elf, ".dynstr");
174
175 /*
176 * If the sections are marked NOBITS, then they don't exist, so we just
177 * skip them. This let's us work sanely with splitdebug ELFs (rather
178 * than spewing a lot of "corrupt ELF" messages later on). In malformed
179 * ELFs, the section might be wrongly set to NOBITS, but screw em.
180 */
181 #define GET_SYMTABS(B) \
182 if (elf->elf_class == ELFCLASS ## B) { \
183 Elf ## B ## _Shdr *esymtab = symtab; \
184 Elf ## B ## _Shdr *estrtab = strtab; \
185 Elf ## B ## _Shdr *edynsym = dynsym; \
186 Elf ## B ## _Shdr *edynstr = dynstr; \
187 \
188 if (symtab && EGET(esymtab->sh_type) == SHT_NOBITS) \
189 symtab = NULL; \
190 if (dynsym && EGET(edynsym->sh_type) == SHT_NOBITS) \
191 dynsym = NULL; \
192 if (symtab && dynsym) \
193 *sym = (EGET(esymtab->sh_size) > EGET(edynsym->sh_size)) ? symtab : dynsym; \
194 else \
195 *sym = symtab ? symtab : dynsym; \
196 \
197 if (strtab && EGET(estrtab->sh_type) == SHT_NOBITS) \
198 strtab = NULL; \
199 if (dynstr && EGET(edynstr->sh_type) == SHT_NOBITS) \
200 dynstr = NULL; \
201 if (strtab && dynstr) \
202 *str = (EGET(estrtab->sh_size) > EGET(edynstr->sh_size)) ? strtab : dynstr; \
203 else \
204 *str = strtab ? strtab : dynstr; \
205 }
206 GET_SYMTABS(32)
207 GET_SYMTABS(64)
208
209 if (*sym && *str)
210 return;
211
212 /*
213 * damn, they're really going to make us work for it huh?
214 * reconstruct the section header info out of the dynamic
215 * tags so we can see what symbols this guy uses at runtime.
216 */
217 #define GET_SYMTABS_DT(B) \
218 if (elf->elf_class == ELFCLASS ## B) { \
219 size_t i; \
220 static Elf ## B ## _Shdr sym_shdr, str_shdr; \
221 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
222 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
223 Elf ## B ## _Addr vsym, vstr, vhash, vgnu_hash; \
224 Elf ## B ## _Dyn *dyn; \
225 Elf ## B ## _Off offset; \
226 \
227 /* lookup symbols used at runtime with DT_SYMTAB / DT_STRTAB */ \
228 vsym = vstr = vhash = vgnu_hash = 0; \
229 memset(&sym_shdr, 0, sizeof(sym_shdr)); \
230 memset(&str_shdr, 0, sizeof(str_shdr)); \
231 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
232 if (EGET(phdr[i].p_type) != PT_DYNAMIC) \
233 continue; \
234 \
235 offset = EGET(phdr[i].p_offset); \
236 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
237 continue; \
238 \
239 dyn = DYN ## B (elf->vdata + offset); \
240 while (EGET(dyn->d_tag) != DT_NULL) { \
241 switch (EGET(dyn->d_tag)) { \
242 case DT_SYMTAB: vsym = EGET(dyn->d_un.d_val); break; \
243 case DT_SYMENT: sym_shdr.sh_entsize = dyn->d_un.d_val; break; \
244 case DT_STRTAB: vstr = EGET(dyn->d_un.d_val); break; \
245 case DT_STRSZ: str_shdr.sh_size = dyn->d_un.d_val; break; \
246 case DT_HASH: vhash = EGET(dyn->d_un.d_val); break; \
247 /*case DT_GNU_HASH: vgnu_hash = EGET(dyn->d_un.d_val); break;*/ \
248 } \
249 ++dyn; \
250 } \
251 if (vsym && vstr) \
252 break; \
253 } \
254 if (!vsym || !vstr || !(vhash || vgnu_hash)) \
255 return; \
256 \
257 /* calc offset into the ELF by finding the load addr of the syms */ \
258 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
259 Elf ## B ## _Addr vaddr = EGET(phdr[i].p_vaddr); \
260 Elf ## B ## _Addr filesz = EGET(phdr[i].p_filesz); \
261 offset = EGET(phdr[i].p_offset); \
262 \
263 if (EGET(phdr[i].p_type) != PT_LOAD) \
264 continue; \
265 \
266 if (vhash >= vaddr && vhash < vaddr + filesz) { \
267 /* Scan the hash table to see how many entries we have */ \
268 Elf32_Word max_sym_idx = 0; \
269 Elf32_Word *hashtbl = elf->vdata + offset + (vhash - vaddr); \
270 Elf32_Word b, nbuckets = EGET(hashtbl[0]); \
271 Elf32_Word nchains = EGET(hashtbl[1]); \
272 Elf32_Word *buckets = &hashtbl[2]; \
273 Elf32_Word *chains = &buckets[nbuckets]; \
274 Elf32_Word sym_idx; \
275 \
276 for (b = 0; b < nbuckets; ++b) { \
277 if (!buckets[b]) \
278 continue; \
279 for (sym_idx = buckets[b]; sym_idx < nchains && sym_idx; sym_idx = chains[sym_idx]) \
280 if (max_sym_idx < sym_idx) \
281 max_sym_idx = sym_idx; \
282 } \
283 ESET(sym_shdr.sh_size, sym_shdr.sh_entsize * max_sym_idx); \
284 } \
285 \
286 if (vsym >= vaddr && vsym < vaddr + filesz) { \
287 ESET(sym_shdr.sh_offset, offset + (vsym - vaddr)); \
288 *sym = &sym_shdr; \
289 } \
290 \
291 if (vstr >= vaddr && vstr < vaddr + filesz) { \
292 ESET(str_shdr.sh_offset, offset + (vstr - vaddr)); \
293 *str = &str_shdr; \
294 } \
295 } \
296 }
297 GET_SYMTABS_DT(32)
298 GET_SYMTABS_DT(64)
299 }
300
301 static char *scanelf_file_pax(elfobj *elf, char *found_pax)
302 {
303 static char ret[7];
304 unsigned long i, shown;
305
306 if (!show_pax) return NULL;
307
308 shown = 0;
309 memset(&ret, 0, sizeof(ret));
310
311 if (elf->phdr) {
312 #define SHOW_PAX(B) \
313 if (elf->elf_class == ELFCLASS ## B) { \
314 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
315 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
316 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
317 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
318 continue; \
319 if (fix_elf && setpax) { \
320 /* set the paxctl flags */ \
321 ESET(phdr[i].p_flags, setpax); \
322 } \
323 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
324 continue; \
325 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
326 *found_pax = 1; \
327 ++shown; \
328 break; \
329 } \
330 }
331 SHOW_PAX(32)
332 SHOW_PAX(64)
333 }
334
335 /* Note: We do not support setting EI_PAX if not PT_PAX_FLAGS
336 * was found. This is known to break ELFs on glibc systems,
337 * and mainline PaX has deprecated use of this for a long time.
338 * We could support changing PT_GNU_STACK, but that doesn't
339 * seem like it's worth the effort. #411919
340 */
341
342 /* fall back to EI_PAX if no PT_PAX was found */
343 if (!*ret) {
344 static char *paxflags;
345 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
346 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
347 *found_pax = 1;
348 return (be_wewy_wewy_quiet ? NULL : paxflags);
349 }
350 strncpy(ret, paxflags, sizeof(ret));
351 }
352
353 if (be_wewy_wewy_quiet || (be_quiet && !shown))
354 return NULL;
355 else
356 return ret;
357 }
358
359 static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
360 {
361 static char ret[12];
362 char *found;
363 unsigned long i, shown, multi_stack, multi_relro, multi_load;
364
365 if (!show_phdr) return NULL;
366
367 memcpy(ret, "--- --- ---\0", 12);
368
369 shown = 0;
370 multi_stack = multi_relro = multi_load = 0;
371
372 #define NOTE_GNU_STACK ".note.GNU-stack"
373 #define SHOW_PHDR(B) \
374 if (elf->elf_class == ELFCLASS ## B) { \
375 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
376 Elf ## B ## _Off offset; \
377 uint32_t flags, check_flags; \
378 if (elf->phdr != NULL) { \
379 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
380 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
381 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
382 if (multi_stack++) \
383 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
384 if (file_matches_list(elf->filename, qa_execstack)) \
385 continue; \
386 found = found_phdr; \
387 offset = 0; \
388 check_flags = PF_X; \
389 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
390 if (multi_relro++) \
391 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
392 found = found_relro; \
393 offset = 4; \
394 check_flags = PF_X; \
395 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
396 if (file_matches_list(elf->filename, qa_wx_load)) \
397 continue; \
398 found = found_load; \
399 offset = 8; \
400 check_flags = PF_W|PF_X; \
401 } else \
402 continue; \
403 flags = EGET(phdr[i].p_flags); \
404 if (be_quiet && ((flags & check_flags) != check_flags)) \
405 continue; \
406 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
407 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
408 ret[3] = ret[7] = '!'; \
409 flags = EGET(phdr[i].p_flags); \
410 } \
411 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
412 *found = 1; \
413 ++shown; \
414 } \
415 } else if (elf->shdr != NULL) { \
416 /* no program headers which means this is prob an object file */ \
417 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
418 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
419 char *str; \
420 if ((void*)strtbl > elf->data_end) \
421 goto skip_this_shdr##B; \
422 /* let's flag -w/+x object files since the final ELF will most likely \
423 * need write access to the stack (who doesn't !?). so the combined \
424 * output will bring in +w automatically and that's bad. \
425 */ \
426 check_flags = /*SHF_WRITE|*/SHF_EXECINSTR; \
427 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
428 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
429 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
430 str = elf->data + offset; \
431 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
432 if (!strcmp(str, NOTE_GNU_STACK)) { \
433 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
434 flags = EGET(shdr[i].sh_flags); \
435 if (be_quiet && ((flags & check_flags) != check_flags)) \
436 continue; \
437 ++*found_phdr; \
438 shown = 1; \
439 if (flags & SHF_WRITE) ret[0] = 'W'; \
440 if (flags & SHF_ALLOC) ret[1] = 'A'; \
441 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
442 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
443 break; \
444 } \
445 } \
446 skip_this_shdr##B: \
447 if (!multi_stack) { \
448 if (file_matches_list(elf->filename, qa_execstack)) \
449 return NULL; \
450 *found_phdr = 1; \
451 shown = 1; \
452 memcpy(ret, "!WX", 3); \
453 } \
454 } \
455 }
456 SHOW_PHDR(32)
457 SHOW_PHDR(64)
458
459 if (be_wewy_wewy_quiet || (be_quiet && !shown))
460 return NULL;
461 else
462 return ret;
463 }
464
465 /*
466 * See if this ELF contains a DT_TEXTREL tag in any of its
467 * PT_DYNAMIC sections.
468 */
469 static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
470 {
471 static const char *ret = "TEXTREL";
472 unsigned long i;
473
474 if (!show_textrel && !show_textrels) return NULL;
475
476 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
477
478 if (elf->phdr) {
479 #define SHOW_TEXTREL(B) \
480 if (elf->elf_class == ELFCLASS ## B) { \
481 Elf ## B ## _Dyn *dyn; \
482 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
483 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
484 Elf ## B ## _Off offset; \
485 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
486 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
487 offset = EGET(phdr[i].p_offset); \
488 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
489 dyn = DYN ## B (elf->vdata + offset); \
490 while (EGET(dyn->d_tag) != DT_NULL) { \
491 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
492 *found_textrel = 1; \
493 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
494 return (be_wewy_wewy_quiet ? NULL : ret); \
495 } \
496 ++dyn; \
497 } \
498 } }
499 SHOW_TEXTREL(32)
500 SHOW_TEXTREL(64)
501 }
502
503 if (be_quiet || be_wewy_wewy_quiet)
504 return NULL;
505 else
506 return " - ";
507 }
508
509 /*
510 * Scan the .text section to see if there are any relocations in it.
511 * Should rewrite this to check PT_LOAD sections that are marked
512 * Executable rather than the section named '.text'.
513 */
514 static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
515 {
516 unsigned long s, r, rmax;
517 void *symtab_void, *strtab_void, *text_void;
518
519 if (!show_textrels) return NULL;
520
521 /* don't search for TEXTREL's if the ELF doesn't have any */
522 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
523 if (!*found_textrel) return NULL;
524
525 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
526 text_void = elf_findsecbyname(elf, ".text");
527
528 if (symtab_void && strtab_void && text_void && elf->shdr) {
529 #define SHOW_TEXTRELS(B) \
530 if (elf->elf_class == ELFCLASS ## B) { \
531 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
532 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
533 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
534 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
535 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
536 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
537 uint ## B ## _t memsz = EGET(text->sh_size); \
538 Elf ## B ## _Rel *rel; \
539 Elf ## B ## _Rela *rela; \
540 /* search the section headers for relocations */ \
541 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
542 uint32_t sh_type = EGET(shdr[s].sh_type); \
543 if (sh_type == SHT_REL) { \
544 rel = REL ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
545 rela = NULL; \
546 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
547 } else if (sh_type == SHT_RELA) { \
548 rel = NULL; \
549 rela = RELA ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
550 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
551 } else \
552 continue; \
553 /* now see if any of the relocs are in the .text */ \
554 for (r = 0; r < rmax; ++r) { \
555 unsigned long sym_max; \
556 Elf ## B ## _Addr offset_tmp; \
557 Elf ## B ## _Sym *func; \
558 Elf ## B ## _Sym *sym; \
559 Elf ## B ## _Addr r_offset; \
560 uint ## B ## _t r_info; \
561 if (sh_type == SHT_REL) { \
562 r_offset = EGET(rel[r].r_offset); \
563 r_info = EGET(rel[r].r_info); \
564 } else { \
565 r_offset = EGET(rela[r].r_offset); \
566 r_info = EGET(rela[r].r_info); \
567 } \
568 /* make sure this relocation is inside of the .text */ \
569 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
570 if (be_verbose <= 2) continue; \
571 } else \
572 *found_textrels = 1; \
573 /* locate this relocation symbol name */ \
574 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
575 if ((void*)sym > elf->data_end) { \
576 warn("%s: corrupt ELF symbol", elf->filename); \
577 continue; \
578 } \
579 sym_max = ELF ## B ## _R_SYM(r_info); \
580 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
581 sym += sym_max; \
582 else \
583 sym = NULL; \
584 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
585 /* show the raw details about this reloc */ \
586 printf(" %s: ", elf->base_filename); \
587 if (sym && sym->st_name) \
588 printf("%s", elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
589 else \
590 printf("(memory/data?)"); \
591 printf(" [0x%lX]", (unsigned long)r_offset); \
592 /* now try to find the closest symbol that this rel is probably in */ \
593 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
594 func = NULL; \
595 offset_tmp = 0; \
596 while (sym_max--) { \
597 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
598 func = sym; \
599 offset_tmp = EGET(sym->st_value); \
600 } \
601 ++sym; \
602 } \
603 printf(" in "); \
604 if (func && func->st_name) { \
605 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
606 if (r_offset > EGET(func->st_size)) \
607 printf("(optimized out: previous %s)", func_name); \
608 else \
609 printf("%s", func_name); \
610 } else \
611 printf("(optimized out)"); \
612 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
613 if (be_verbose && objdump) { \
614 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
615 char *sysbuf; \
616 size_t syslen; \
617 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"; \
618 syslen = sizeof(sysfmt) + strlen(objdump) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
619 sysbuf = xmalloc(syslen); \
620 if (end_addr < r_offset) \
621 /* not uncommon when things are optimized out */ \
622 end_addr = r_offset + 0x100; \
623 snprintf(sysbuf, syslen, sysfmt, \
624 objdump, \
625 (unsigned long)offset_tmp, \
626 (unsigned long)end_addr, \
627 elf->filename, \
628 (unsigned long)r_offset); \
629 fflush(stdout); \
630 if (system(sysbuf)) {/* don't care */} \
631 fflush(stdout); \
632 free(sysbuf); \
633 } \
634 } \
635 } }
636 SHOW_TEXTRELS(32)
637 SHOW_TEXTRELS(64)
638 }
639 if (!*found_textrels)
640 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
641
642 return NULL;
643 }
644
645 static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
646 {
647 struct stat st;
648 switch (*item) {
649 case '/': break;
650 case '.':
651 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
652 break;
653 case ':':
654 case '\0':
655 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
656 break;
657 case '$':
658 if (fstat(elf->fd, &st) != -1)
659 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
660 warnf("Security problem with %s='%s' in %s with mode set of %o",
661 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
662 break;
663 default:
664 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
665 break;
666 }
667 }
668 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
669 {
670 unsigned long i;
671 char *rpath, *runpath, **r;
672 void *strtbl_void;
673
674 if (!show_rpath) return;
675
676 strtbl_void = elf_findsecbyname(elf, ".dynstr");
677 rpath = runpath = NULL;
678
679 if (elf->phdr && strtbl_void) {
680 #define SHOW_RPATH(B) \
681 if (elf->elf_class == ELFCLASS ## B) { \
682 Elf ## B ## _Dyn *dyn; \
683 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
684 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
685 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
686 Elf ## B ## _Off offset; \
687 Elf ## B ## _Xword word; \
688 /* Scan all the program headers */ \
689 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
690 /* Just scan dynamic headers */ \
691 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
692 offset = EGET(phdr[i].p_offset); \
693 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
694 /* Just scan dynamic RPATH/RUNPATH headers */ \
695 dyn = DYN ## B (elf->vdata + offset); \
696 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
697 if (word == DT_RPATH) { \
698 r = &rpath; \
699 } else if (word == DT_RUNPATH) { \
700 r = &runpath; \
701 } else { \
702 ++dyn; \
703 continue; \
704 } \
705 /* Verify the memory is somewhat sane */ \
706 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
707 if (offset < (Elf ## B ## _Off)elf->len) { \
708 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
709 *r = elf->data + offset; \
710 /* cache the length in case we need to nuke this section later on */ \
711 if (fix_elf) \
712 offset = strlen(*r); \
713 /* If quiet, don't output paths in ld.so.conf */ \
714 if (be_quiet) { \
715 size_t len; \
716 char *start, *end; \
717 /* note that we only 'chop' off leading known paths. */ \
718 /* since *r is read-only memory, we can only move the ptr forward. */ \
719 start = *r; \
720 /* scan each path in : delimited list */ \
721 while (start) { \
722 rpath_security_checks(elf, start, get_elfdtype(word)); \
723 end = strchr(start, ':'); \
724 len = (end ? abs(end - start) : strlen(start)); \
725 if (use_ldcache) { \
726 size_t n; \
727 const char *ldpath; \
728 array_for_each(ldpaths, n, ldpath) \
729 if (!strncmp(ldpath, start, len) && !ldpath[len]) { \
730 *r = end; \
731 /* corner case ... if RPATH reads "/usr/lib:", we want \
732 * to show ':' rather than '' */ \
733 if (end && end[1] != '\0') \
734 (*r)++; \
735 break; \
736 } \
737 } \
738 if (!*r || !end) \
739 break; \
740 else \
741 start = start + len + 1; \
742 } \
743 } \
744 if (*r) { \
745 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
746 /* just nuke it */ \
747 nuke_it##B: \
748 memset(*r, 0x00, offset); \
749 *r = NULL; \
750 ESET(dyn->d_tag, DT_DEBUG); \
751 ESET(dyn->d_un.d_ptr, 0); \
752 } else if (fix_elf) { \
753 /* try to clean "bad" paths */ \
754 size_t len, tmpdir_len; \
755 char *start, *end; \
756 const char *tmpdir; \
757 start = *r; \
758 tmpdir = (getenv("TMPDIR") ? : "."); \
759 tmpdir_len = strlen(tmpdir); \
760 while (1) { \
761 end = strchr(start, ':'); \
762 if (start == end) { \
763 eat_this_path##B: \
764 len = strlen(end); \
765 memmove(start, end+1, len); \
766 start[len-1] = '\0'; \
767 end = start - 1; \
768 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
769 if (!end) { \
770 if (start == *r) \
771 goto nuke_it##B; \
772 *--start = '\0'; \
773 } else \
774 goto eat_this_path##B; \
775 } \
776 if (!end) \
777 break; \
778 start = end + 1; \
779 } \
780 if (**r == '\0') \
781 goto nuke_it##B; \
782 } \
783 if (*r) \
784 *found_rpath = 1; \
785 } \
786 } \
787 ++dyn; \
788 } \
789 } }
790 SHOW_RPATH(32)
791 SHOW_RPATH(64)
792 }
793
794 if (be_wewy_wewy_quiet) return;
795
796 if (rpath && runpath) {
797 if (!strcmp(rpath, runpath)) {
798 xstrcat(ret, runpath, ret_len);
799 } else {
800 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
801 xchrcat(ret, '{', ret_len);
802 xstrcat(ret, rpath, ret_len);
803 xchrcat(ret, ',', ret_len);
804 xstrcat(ret, runpath, ret_len);
805 xchrcat(ret, '}', ret_len);
806 }
807 } else if (rpath || runpath)
808 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
809 else if (!be_quiet)
810 xstrcat(ret, " - ", ret_len);
811 }
812
813 /* Defines can be seen in glibc's sysdeps/generic/ldconfig.h */
814 #define LDSO_CACHE_MAGIC "ld.so-"
815 #define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
816 #define LDSO_CACHE_VER "1.7.0"
817 #define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
818 #define FLAG_ANY -1
819 #define FLAG_TYPE_MASK 0x00ff
820 #define FLAG_LIBC4 0x0000
821 #define FLAG_ELF 0x0001
822 #define FLAG_ELF_LIBC5 0x0002
823 #define FLAG_ELF_LIBC6 0x0003
824 #define FLAG_REQUIRED_MASK 0xff00
825 #define FLAG_SPARC_LIB64 0x0100
826 #define FLAG_IA64_LIB64 0x0200
827 #define FLAG_X8664_LIB64 0x0300
828 #define FLAG_S390_LIB64 0x0400
829 #define FLAG_POWERPC_LIB64 0x0500
830 #define FLAG_MIPS64_LIBN32 0x0600
831 #define FLAG_MIPS64_LIBN64 0x0700
832 #define FLAG_X8664_LIBX32 0x0800
833 #define FLAG_ARM_LIBHF 0x0900
834 #define FLAG_AARCH64_LIB64 0x0a00
835
836 #if defined(__GLIBC__) || defined(__UCLIBC__)
837
838 static char *lookup_cache_lib(elfobj *elf, const char *fname)
839 {
840 int fd;
841 char *strs;
842 static char buf[__PAX_UTILS_PATH_MAX] = "";
843 const char *cachefile = root_rel_path("/etc/ld.so.cache");
844 struct stat st;
845
846 typedef struct {
847 char magic[LDSO_CACHE_MAGIC_LEN];
848 char version[LDSO_CACHE_VER_LEN];
849 int nlibs;
850 } header_t;
851 header_t *header;
852
853 typedef struct {
854 int flags;
855 int sooffset;
856 int liboffset;
857 } libentry_t;
858 libentry_t *libent;
859
860 if (fname == NULL)
861 return NULL;
862
863 if (ldcache == NULL) {
864 if (fstatat(root_fd, cachefile, &st, 0))
865 return NULL;
866
867 fd = openat(root_fd, cachefile, O_RDONLY);
868 if (fd == -1)
869 return NULL;
870
871 /* cache these values so we only map/unmap the cache file once */
872 ldcache_size = st.st_size;
873 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
874 close(fd);
875
876 if (ldcache == MAP_FAILED) {
877 ldcache = NULL;
878 return NULL;
879 }
880
881 if (memcmp(header->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN) ||
882 memcmp(header->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
883 {
884 munmap(ldcache, ldcache_size);
885 ldcache = NULL;
886 return NULL;
887 }
888 } else
889 header = ldcache;
890
891 libent = ldcache + sizeof(header_t);
892 strs = (char *) &libent[header->nlibs];
893
894 for (fd = 0; fd < header->nlibs; ++fd) {
895 /* This should be more fine grained, but for now we assume that
896 * diff arches will not be cached together, and we ignore the
897 * the different multilib mips cases.
898 */
899 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
900 continue;
901 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
902 continue;
903
904 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
905 continue;
906
907 /* Return first hit because that is how the ldso rolls */
908 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
909 break;
910 }
911
912 return buf;
913 }
914
915 #elif defined(__NetBSD__)
916 static char *lookup_cache_lib(elfobj *elf, const char *fname)
917 {
918 static char buf[__PAX_UTILS_PATH_MAX] = "";
919 static struct stat st;
920 size_t n;
921 char *ldpath;
922
923 array_for_each(ldpath, n, ldpath) {
924 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", ldpath, fname) >= sizeof(buf))
925 continue; /* if the pathname is too long, or something went wrong, ignore */
926
927 if (stat(buf, &st) != 0)
928 continue; /* if the lib doesn't exist in *ldpath, look further */
929
930 /* NetBSD doesn't actually do sanity checks, it just loads the file
931 * and if that doesn't work, continues looking in other directories.
932 * This cannot easily be safely emulated, unfortunately. For now,
933 * just assume that if it exists, it's a valid library. */
934
935 return buf;
936 }
937
938 /* not found in any path */
939 return NULL;
940 }
941 #else
942 #ifdef __ELF__
943 #warning Cache support not implemented for your target
944 #endif
945 static char *lookup_cache_lib(elfobj *elf, const char *fname)
946 {
947 return NULL;
948 }
949 #endif
950
951 static char *lookup_config_lib(const char *fname)
952 {
953 static char buf[__PAX_UTILS_PATH_MAX] = "";
954 const char *ldpath;
955 size_t n;
956
957 array_for_each(ldpaths, n, ldpath) {
958 snprintf(buf, sizeof(buf), "%s/%s", root_rel_path(ldpath), fname);
959 if (faccessat(root_fd, buf, F_OK, AT_SYMLINK_NOFOLLOW) == 0)
960 return buf;
961 }
962
963 return NULL;
964 }
965
966 static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
967 {
968 unsigned long i;
969 char *needed;
970 void *strtbl_void;
971 char *p;
972
973 /*
974 * -n -> op==0 -> print all
975 * -N -> op==1 -> print requested
976 */
977 if ((op == 0 && !show_needed) || (op == 1 && !find_lib))
978 return NULL;
979
980 strtbl_void = elf_findsecbyname(elf, ".dynstr");
981
982 if (elf->phdr && strtbl_void) {
983 #define SHOW_NEEDED(B) \
984 if (elf->elf_class == ELFCLASS ## B) { \
985 Elf ## B ## _Dyn *dyn; \
986 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
987 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
988 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
989 Elf ## B ## _Off offset; \
990 size_t matched = 0; \
991 /* Walk all the program headers to find the PT_DYNAMIC */ \
992 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
993 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) \
994 continue; \
995 offset = EGET(phdr[i].p_offset); \
996 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
997 continue; \
998 /* Walk all the dynamic tags to find NEEDED entries */ \
999 dyn = DYN ## B (elf->vdata + offset); \
1000 while (EGET(dyn->d_tag) != DT_NULL) { \
1001 if (EGET(dyn->d_tag) == DT_NEEDED) { \
1002 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
1003 if (offset >= (Elf ## B ## _Off)elf->len) { \
1004 ++dyn; \
1005 continue; \
1006 } \
1007 needed = elf->data + offset; \
1008 if (op == 0) { \
1009 /* -n -> print all entries */ \
1010 if (!be_wewy_wewy_quiet) { \
1011 if (*found_needed) xchrcat(ret, ',', ret_len); \
1012 if (use_ldpath) { \
1013 if ((p = lookup_config_lib(needed)) != NULL) \
1014 needed = p; \
1015 } else if (use_ldcache) { \
1016 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
1017 needed = p; \
1018 } \
1019 xstrcat(ret, needed, ret_len); \
1020 } \
1021 *found_needed = 1; \
1022 } else { \
1023 /* -N -> print matching entries */ \
1024 size_t n; \
1025 const char *find_lib_name; \
1026 \
1027 array_for_each(find_lib_arr, n, find_lib_name) { \
1028 int invert = 1; \
1029 if (find_lib_name[0] == '!') \
1030 invert = 0, ++find_lib_name; \
1031 if (!strcmp(find_lib_name, needed) == invert) \
1032 ++matched; \
1033 } \
1034 \
1035 if (matched == array_cnt(find_lib_arr)) { \
1036 *found_lib = 1; \
1037 return (be_wewy_wewy_quiet ? NULL : find_lib); \
1038 } \
1039 } \
1040 } \
1041 ++dyn; \
1042 } \
1043 } }
1044 SHOW_NEEDED(32)
1045 SHOW_NEEDED(64)
1046 if (op == 0 && !*found_needed && be_verbose)
1047 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
1048 }
1049
1050 return NULL;
1051 }
1052 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
1053 {
1054 void *strtbl_void;
1055
1056 if (!show_interp) return NULL;
1057
1058 strtbl_void = elf_findsecbyname(elf, ".interp");
1059
1060 if (strtbl_void) {
1061 #define SHOW_INTERP(B) \
1062 if (elf->elf_class == ELFCLASS ## B) { \
1063 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
1064 *found_interp = 1; \
1065 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
1066 }
1067 SHOW_INTERP(32)
1068 SHOW_INTERP(64)
1069 } else {
1070 /* Walk all the program headers to find the PT_INTERP */
1071 #define SHOW_PT_INTERP(B) \
1072 if (elf->elf_class == ELFCLASS ## B) { \
1073 unsigned long i; \
1074 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1075 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1076 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1077 if (EGET(phdr[i].p_type) != PT_INTERP) \
1078 continue; \
1079 *found_interp = 1; \
1080 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(phdr[i].p_offset)); \
1081 } \
1082 }
1083 SHOW_PT_INTERP(32)
1084 SHOW_PT_INTERP(64)
1085 }
1086
1087 return NULL;
1088 }
1089 static const char *scanelf_file_bind(elfobj *elf, char *found_bind)
1090 {
1091 unsigned long i;
1092 struct stat s;
1093 bool dynamic = false;
1094
1095 if (!show_bind) return NULL;
1096 if (!elf->phdr) return NULL;
1097
1098 #define SHOW_BIND(B) \
1099 if (elf->elf_class == ELFCLASS ## B) { \
1100 Elf ## B ## _Dyn *dyn; \
1101 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1102 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1103 Elf ## B ## _Off offset; \
1104 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1105 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1106 dynamic = true; \
1107 offset = EGET(phdr[i].p_offset); \
1108 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
1109 dyn = DYN ## B (elf->vdata + offset); \
1110 while (EGET(dyn->d_tag) != DT_NULL) { \
1111 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
1112 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
1113 { \
1114 if (be_quiet) return NULL; \
1115 *found_bind = 1; \
1116 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
1117 } \
1118 ++dyn; \
1119 } \
1120 } \
1121 }
1122 SHOW_BIND(32)
1123 SHOW_BIND(64)
1124
1125 if (be_wewy_wewy_quiet) return NULL;
1126
1127 /* don't output anything if quiet mode and the ELF is static or not setuid */
1128 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
1129 return NULL;
1130 } else {
1131 *found_bind = 1;
1132 return dynamic ? "LAZY" : "STATIC";
1133 }
1134 }
1135 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
1136 {
1137 unsigned long i;
1138 char *soname;
1139 void *strtbl_void;
1140
1141 if (!show_soname) return NULL;
1142
1143 strtbl_void = elf_findsecbyname(elf, ".dynstr");
1144
1145 if (elf->phdr && strtbl_void) {
1146 #define SHOW_SONAME(B) \
1147 if (elf->elf_class == ELFCLASS ## B) { \
1148 Elf ## B ## _Dyn *dyn; \
1149 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1150 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1151 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
1152 Elf ## B ## _Off offset; \
1153 /* only look for soname in shared objects */ \
1154 if (EGET(ehdr->e_type) != ET_DYN) \
1155 return NULL; \
1156 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1157 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1158 offset = EGET(phdr[i].p_offset); \
1159 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
1160 dyn = DYN ## B (elf->vdata + offset); \
1161 while (EGET(dyn->d_tag) != DT_NULL) { \
1162 if (EGET(dyn->d_tag) == DT_SONAME) { \
1163 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
1164 if (offset >= (Elf ## B ## _Off)elf->len) { \
1165 ++dyn; \
1166 continue; \
1167 } \
1168 soname = elf->data + offset; \
1169 *found_soname = 1; \
1170 return (be_wewy_wewy_quiet ? NULL : soname); \
1171 } \
1172 ++dyn; \
1173 } \
1174 } }
1175 SHOW_SONAME(32)
1176 SHOW_SONAME(64)
1177 }
1178
1179 return NULL;
1180 }
1181
1182 /*
1183 * We support the symbol form:
1184 * [%[modifiers]%][[+-]<symbol name>][,[.....]]
1185 * If the symbol name is empty, then all symbols are matched.
1186 * If the symbol name is a glob ("*"), then all symbols are dumped (debug).
1187 * Do not rely on this output format at all.
1188 * Otherwise the symbol name is used to search (either regex or string compare).
1189 * If the first char of the symbol name is a plus ("+"), then only match
1190 * defined symbols. If it's a minus ("-"), only match undefined symbols.
1191 * Putting modifiers in between the percent signs allows for more in depth
1192 * filters. There are groups of modifiers. If you don't specify a member
1193 * of a group, then all types in that group are matched. The current
1194 * groups and their types are:
1195 * STT group: STT_NOTYPE:n STT_OBJECT:o STT_FUNC:f STT_FILE:F
1196 * STB group: STB_LOCAL:l STB_GLOBAL:g STB_WEAK:w
1197 * SHN group: SHN_UNDEF:u SHN_ABS:a SHN_COMMON:c {defined}:d
1198 * The "defined" value in the SHN group does not correspond to a SHN_xxx define.
1199 * You can search for multiple symbols at once by seperating with a comma (",").
1200 *
1201 * Some examples:
1202 * ELFs with a weak function "foo":
1203 * scanelf -s %wf%foo <ELFs>
1204 * ELFs that define the symbol "main":
1205 * scanelf -s +main <ELFs>
1206 * scanelf -s %d%main <ELFs>
1207 * ELFs that refer to the undefined symbol "brk":
1208 * scanelf -s -brk <ELFs>
1209 * scanelf -s %u%brk <ELFs>
1210 * All global defined objects in an ELF:
1211 * scanelf -s %ogd% <ELF>
1212 */
1213 static void
1214 scanelf_match_symname(elfobj *elf, char *found_sym, char **ret, size_t *ret_len, const char *symname,
1215 unsigned int stt, unsigned int stb, unsigned int shn, unsigned long size)
1216 {
1217 const char *this_sym;
1218 size_t n;
1219
1220 array_for_each(find_sym_arr, n, this_sym) {
1221 bool inc_notype, inc_object, inc_func, inc_file,
1222 inc_local, inc_global, inc_weak,
1223 inc_def, inc_undef, inc_abs, inc_common;
1224
1225 /* symbol selection! */
1226 inc_notype = inc_object = inc_func = inc_file = \
1227 inc_local = inc_global = inc_weak = \
1228 inc_def = inc_undef = inc_abs = inc_common = \
1229 (*this_sym != '%');
1230
1231 /* parse the contents of %...% */
1232 if (!inc_notype) {
1233 while (*(this_sym++)) {
1234 if (*this_sym == '%') {
1235 ++this_sym;
1236 break;
1237 }
1238 switch (*this_sym) {
1239 case 'n': inc_notype = true; break;
1240 case 'o': inc_object = true; break;
1241 case 'f': inc_func = true; break;
1242 case 'F': inc_file = true; break;
1243 case 'l': inc_local = true; break;
1244 case 'g': inc_global = true; break;
1245 case 'w': inc_weak = true; break;
1246 case 'd': inc_def = true; break;
1247 case 'u': inc_undef = true; break;
1248 case 'a': inc_abs = true; break;
1249 case 'c': inc_common = true; break;
1250 default: err("invalid symbol selector '%c'", *this_sym);
1251 }
1252 }
1253
1254 /* If no types are matched, not match all */
1255 if (!inc_notype && !inc_object && !inc_func && !inc_file)
1256 inc_notype = inc_object = inc_func = inc_file = true;
1257 if (!inc_local && !inc_global && !inc_weak)
1258 inc_local = inc_global = inc_weak = true;
1259 if (!inc_def && !inc_undef && !inc_abs && !inc_common)
1260 inc_def = inc_undef = inc_abs = inc_common = true;
1261
1262 /* backwards compat for defined/undefined short hand */
1263 } else if (*this_sym == '+') {
1264 inc_undef = false;
1265 ++this_sym;
1266 } else if (*this_sym == '-') {
1267 inc_def = inc_abs = inc_common = false;
1268 ++this_sym;
1269 }
1270
1271 /* filter symbols */
1272 if ((!inc_notype && stt == STT_NOTYPE) || \
1273 (!inc_object && stt == STT_OBJECT) || \
1274 (!inc_func && stt == STT_FUNC ) || \
1275 (!inc_file && stt == STT_FILE ) || \
1276 (!inc_local && stb == STB_LOCAL ) || \
1277 (!inc_global && stb == STB_GLOBAL) || \
1278 (!inc_weak && stb == STB_WEAK ) || \
1279 (!inc_def && shn && shn < SHN_LORESERVE) || \
1280 (!inc_undef && shn == SHN_UNDEF ) || \
1281 (!inc_abs && shn == SHN_ABS ) || \
1282 (!inc_common && shn == SHN_COMMON))
1283 continue;
1284
1285 if (*this_sym == '*') {
1286 /* a "*" symbol gets you debug output */
1287 printf("%s(%s) %5lX %15s %15s %15s %s\n",
1288 ((*found_sym == 0) ? "\n\t" : "\t"),
1289 elf->base_filename,
1290 size,
1291 get_elfstttype(stt),
1292 get_elfstbtype(stb),
1293 get_elfshntype(shn),
1294 symname);
1295 goto matched;
1296
1297 } else {
1298 if (g_match) {
1299 /* regex match the symbol */
1300 if (regexec(find_sym_regex_arr->eles[n], symname, 0, NULL, 0) == REG_NOMATCH)
1301 continue;
1302
1303 } else if (*this_sym) {
1304 /* give empty symbols a "pass", else do a normal compare */
1305 const size_t len = strlen(this_sym);
1306 if (!(strncmp(this_sym, symname, len) == 0 &&
1307 /* Accept unversioned symbol names */
1308 (symname[len] == '\0' || symname[len] == '@')))
1309 continue;
1310 }
1311
1312 if (be_semi_verbose) {
1313 char buf[1024];
1314 snprintf(buf, sizeof(buf), "%lX %s %s",
1315 size,
1316 get_elfstttype(stt),
1317 this_sym);
1318 *ret = xstrdup(buf);
1319 } else {
1320 if (*ret) xchrcat(ret, ',', ret_len);
1321 xstrcat(ret, symname, ret_len);
1322 }
1323
1324 goto matched;
1325 }
1326 }
1327
1328 return;
1329
1330 matched:
1331 *found_sym = 1;
1332 }
1333
1334 static const char *scanelf_file_sym(elfobj *elf, char *found_sym)
1335 {
1336 char *ret;
1337 void *symtab_void, *strtab_void;
1338
1339 if (!find_sym) return NULL;
1340 ret = NULL;
1341
1342 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
1343
1344 if (symtab_void && strtab_void) {
1345 #define FIND_SYM(B) \
1346 if (elf->elf_class == ELFCLASS ## B) { \
1347 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
1348 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
1349 Elf ## B ## _Sym *sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
1350 Elf ## B ## _Word i, cnt = EGET(symtab->sh_entsize); \
1351 char *symname; \
1352 size_t ret_len = 0; \
1353 if (cnt) \
1354 cnt = EGET(symtab->sh_size) / cnt; \
1355 for (i = 0; i < cnt; ++i) { \
1356 if ((void*)sym > elf->data_end) { \
1357 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1358 goto break_out; \
1359 } \
1360 if (sym->st_name) { \
1361 /* make sure the symbol name is in acceptable memory range */ \
1362 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
1363 if ((void*)symname > elf->data_end) { \
1364 warnf("%s: corrupt ELF symbols", elf->filename); \
1365 ++sym; \
1366 continue; \
1367 } \
1368 scanelf_match_symname(elf, found_sym, \
1369 &ret, &ret_len, symname, \
1370 ELF##B##_ST_TYPE(EGET(sym->st_info)), \
1371 ELF##B##_ST_BIND(EGET(sym->st_info)), \
1372 EGET(sym->st_shndx), \
1373 /* st_size can be 64bit, but no one is really that big, so screw em */ \
1374 EGET(sym->st_size)); \
1375 } \
1376 ++sym; \
1377 } \
1378 }
1379 FIND_SYM(32)
1380 FIND_SYM(64)
1381 }
1382
1383 break_out:
1384 if (be_wewy_wewy_quiet) return NULL;
1385
1386 if (*find_sym != '*' && *found_sym)
1387 return ret;
1388 if (be_quiet)
1389 return NULL;
1390 else
1391 return " - ";
1392 }
1393
1394 static const char *scanelf_file_sections(elfobj *elf, char *found_section)
1395 {
1396 if (!find_section)
1397 return NULL;
1398
1399 #define FIND_SECTION(B) \
1400 if (elf->elf_class == ELFCLASS ## B) { \
1401 size_t matched, n; \
1402 int invert; \
1403 const char *section_name; \
1404 Elf ## B ## _Shdr *section; \
1405 \
1406 matched = 0; \
1407 array_for_each(find_section_arr, n, section_name) { \
1408 invert = (*section_name == '!' ? 1 : 0); \
1409 section = SHDR ## B (elf_findsecbyname(elf, section_name + invert)); \
1410 if ((section == NULL && invert) || (section != NULL && !invert)) \
1411 ++matched; \
1412 } \
1413 \
1414 if (matched == array_cnt(find_section_arr)) \
1415 *found_section = 1; \
1416 }
1417 FIND_SECTION(32)
1418 FIND_SECTION(64)
1419
1420 if (be_wewy_wewy_quiet)
1421 return NULL;
1422
1423 if (*found_section)
1424 return find_section;
1425
1426 if (be_quiet)
1427 return NULL;
1428 else
1429 return " - ";
1430 }
1431
1432 /* scan an elf file and show all the fun stuff */
1433 #define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
1434 static int scanelf_elfobj(elfobj *elf)
1435 {
1436 unsigned long i;
1437 char found_pax, found_phdr, found_relro, found_load, found_textrel,
1438 found_rpath, found_needed, found_interp, found_bind, found_soname,
1439 found_sym, found_lib, found_file, found_textrels, found_section;
1440 static char *out_buffer = NULL;
1441 static size_t out_len;
1442
1443 found_pax = found_phdr = found_relro = found_load = found_textrel = \
1444 found_rpath = found_needed = found_interp = found_bind = found_soname = \
1445 found_sym = found_lib = found_file = found_textrels = found_section = 0;
1446
1447 if (be_verbose > 2)
1448 printf("%s: scanning file {%s,%s}\n", elf->filename,
1449 get_elfeitype(EI_CLASS, elf->elf_class),
1450 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
1451 else if (be_verbose > 1)
1452 printf("%s: scanning file\n", elf->filename);
1453
1454 /* init output buffer */
1455 if (!out_buffer) {
1456 out_len = sizeof(char) * 80;
1457 out_buffer = xmalloc(out_len);
1458 }
1459 *out_buffer = '\0';
1460
1461 /* show the header */
1462 if (!be_quiet && show_banner) {
1463 for (i = 0; out_format[i]; ++i) {
1464 if (!IS_MODIFIER(out_format[i])) continue;
1465
1466 switch (out_format[++i]) {
1467 case '+': break;
1468 case '%': break;
1469 case '#': break;
1470 case 'F':
1471 case 'p':
1472 case 'f': prints("FILE "); found_file = 1; break;
1473 case 'o': prints(" TYPE "); break;
1474 case 'x': prints(" PAX "); break;
1475 case 'e': prints("STK/REL/PTL "); break;
1476 case 't': prints("TEXTREL "); break;
1477 case 'r': prints("RPATH "); break;
1478 case 'M': prints("CLASS "); break;
1479 case 'l':
1480 case 'n': prints("NEEDED "); break;
1481 case 'i': prints("INTERP "); break;
1482 case 'b': prints("BIND "); break;
1483 case 'Z': prints("SIZE "); break;
1484 case 'S': prints("SONAME "); break;
1485 case 's': prints("SYM "); break;
1486 case 'N': prints("LIB "); break;
1487 case 'T': prints("TEXTRELS "); break;
1488 case 'k': prints("SECTION "); break;
1489 case 'a': prints("ARCH "); break;
1490 case 'I': prints("OSABI "); break;
1491 case 'Y': prints("EABI "); break;
1492 case 'O': prints("PERM "); break;
1493 case 'D': prints("ENDIAN "); break;
1494 default: warnf("'%c' has no title ?", out_format[i]);
1495 }
1496 }
1497 if (!found_file) prints("FILE ");
1498 prints("\n");
1499 found_file = 0;
1500 show_banner = 0;
1501 }
1502
1503 /* dump all the good stuff */
1504 for (i = 0; out_format[i]; ++i) {
1505 const char *out;
1506 const char *tmp;
1507 static char ubuf[sizeof(unsigned long)*2];
1508 if (!IS_MODIFIER(out_format[i])) {
1509 xchrcat(&out_buffer, out_format[i], &out_len);
1510 continue;
1511 }
1512
1513 out = NULL;
1514 be_wewy_wewy_quiet = (out_format[i] == '#');
1515 be_semi_verbose = (out_format[i] == '+');
1516 switch (out_format[++i]) {
1517 case '+':
1518 case '%':
1519 case '#':
1520 xchrcat(&out_buffer, out_format[i], &out_len); break;
1521 case 'F':
1522 found_file = 1;
1523 if (be_wewy_wewy_quiet) break;
1524 xstrcat(&out_buffer, elf->filename, &out_len);
1525 break;
1526 case 'p':
1527 found_file = 1;
1528 if (be_wewy_wewy_quiet) break;
1529 tmp = elf->filename;
1530 if (search_path) {
1531 ssize_t len_search = strlen(search_path);
1532 ssize_t len_file = strlen(elf->filename);
1533 if (!strncmp(elf->filename, search_path, len_search) && \
1534 len_file > len_search)
1535 tmp += len_search;
1536 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1537 }
1538 xstrcat(&out_buffer, tmp, &out_len);
1539 break;
1540 case 'f':
1541 found_file = 1;
1542 if (be_wewy_wewy_quiet) break;
1543 tmp = strrchr(elf->filename, '/');
1544 tmp = (tmp == NULL ? elf->filename : tmp+1);
1545 xstrcat(&out_buffer, tmp, &out_len);
1546 break;
1547 case 'o': out = get_elfetype(elf); break;
1548 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
1549 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
1550 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1551 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
1552 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1553 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1554 case 'D': out = get_endian(elf); break;
1555 case 'O': out = strfileperms(elf->filename); break;
1556 case 'n':
1557 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
1558 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1559 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1560 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
1561 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1562 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1563 case 'a': out = get_elfemtype(elf); break;
1564 case 'I': out = get_elfosabi(elf); break;
1565 case 'Y': out = get_elf_eabi(elf); break;
1566 case 'Z': snprintf(ubuf, sizeof(ubuf), "%lu", (unsigned long)elf->len); out = ubuf; break;;
1567 default: warnf("'%c' has no scan code?", out_format[i]);
1568 }
1569 if (out)
1570 xstrcat(&out_buffer, out, &out_len);
1571 }
1572
1573 #define FOUND_SOMETHING() \
1574 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1575 found_rpath || found_needed || found_interp || found_bind || \
1576 found_soname || found_sym || found_lib || found_textrels || found_section )
1577
1578 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1579 xchrcat(&out_buffer, ' ', &out_len);
1580 xstrcat(&out_buffer, elf->filename, &out_len);
1581 }
1582 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
1583 puts(out_buffer);
1584 fflush(stdout);
1585 }
1586
1587 return 0;
1588 }
1589
1590 /* scan a single elf */
1591 static int scanelf_elf(const char *filename, int fd, size_t len)
1592 {
1593 int ret = 1;
1594 size_t n;
1595 const char *match_etype;
1596 elfobj *elf;
1597
1598 /* Verify this is a real ELF */
1599 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1600 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1601 return 2;
1602 }
1603
1604 /* Possibly filter based on ELF bitness */
1605 switch (match_bits) {
1606 case 32:
1607 if (elf->elf_class != ELFCLASS32)
1608 goto done;
1609 break;
1610 case 64:
1611 if (elf->elf_class != ELFCLASS64)
1612 goto done;
1613 break;
1614 }
1615
1616 /* Possibly filter based on the ELF's e_type field */
1617 array_for_each(match_etypes, n, match_etype)
1618 if (etype_lookup(match_etype) == get_etype(elf))
1619 goto scanit;
1620 if (array_cnt(match_etypes))
1621 goto done;
1622
1623 scanit:
1624 ret = scanelf_elfobj(elf);
1625
1626 done:
1627 unreadelf(elf);
1628 return ret;
1629 }
1630
1631 /* scan an archive of elfs */
1632 static int scanelf_archive(const char *filename, int fd, size_t len)
1633 {
1634 archive_handle *ar;
1635 archive_member *m;
1636 char *ar_buffer;
1637 elfobj *elf;
1638
1639 ar = ar_open_fd(filename, fd);
1640 if (ar == NULL)
1641 return 1;
1642
1643 ar_buffer = mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1644 while ((m = ar_next(ar)) != NULL) {
1645 off_t cur_pos = lseek(fd, 0, SEEK_CUR);
1646 if (cur_pos == -1)
1647 errp("lseek() failed");
1648 elf = readelf_buffer(m->name, ar_buffer + cur_pos, m->size);
1649 if (elf) {
1650 scanelf_elfobj(elf);
1651 unreadelf(elf);
1652 }
1653 }
1654 munmap(ar_buffer, len);
1655
1656 return 0;
1657 }
1658 /* scan a file which may be an elf or an archive or some other magical beast */
1659 static int scanelf_fileat(int dir_fd, const char *filename, const struct stat *st_cache)
1660 {
1661 const struct stat *st = st_cache;
1662 struct stat symlink_st;
1663 int fd;
1664
1665 /* always handle regular files and handle symlinked files if no -y */
1666 if (S_ISLNK(st->st_mode)) {
1667 if (!scan_symlink)
1668 return 1;
1669 fstatat(dir_fd, filename, &symlink_st, 0);
1670 st = &symlink_st;
1671 }
1672
1673 if (!S_ISREG(st->st_mode)) {
1674 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1675 return 1;
1676 }
1677
1678 if (match_perms) {
1679 if ((st->st_mode | match_perms) != st->st_mode)
1680 return 1;
1681 }
1682 fd = openat(dir_fd, filename, (fix_elf ? O_RDWR : O_RDONLY) | O_CLOEXEC);
1683 if (fd == -1) {
1684 if (fix_elf && errno == ETXTBSY)
1685 warnp("%s: could not fix", filename);
1686 else if (be_verbose > 2)
1687 printf("%s: skipping file: %s\n", filename, strerror(errno));
1688 return 1;
1689 }
1690
1691 if (scanelf_elf(filename, fd, st->st_size) == 2) {
1692 /* if it isn't an ELF, maybe it's an .a archive */
1693 if (scan_archives)
1694 scanelf_archive(filename, fd, st->st_size);
1695
1696 /*
1697 * unreadelf() implicitly closes its fd, so only close it
1698 * when we are returning it in the non-ELF case
1699 */
1700 close(fd);
1701 }
1702
1703 return 0;
1704 }
1705
1706 /* scan a directory for ET_EXEC files and print when we find one */
1707 static int scanelf_dirat(int dir_fd, const char *path)
1708 {
1709 register DIR *dir;
1710 register struct dirent *dentry;
1711 struct stat st_top, st;
1712 char buf[__PAX_UTILS_PATH_MAX], *subpath;
1713 size_t pathlen = 0, len = 0;
1714 int ret = 0;
1715 int subdir_fd;
1716
1717 /* make sure path exists */
1718 if (fstatat(dir_fd, path, &st_top, AT_SYMLINK_NOFOLLOW) == -1) {
1719 if (be_verbose > 2) printf("%s: does not exist\n", path);
1720 return 1;
1721 }
1722
1723 /* ok, if it isn't a directory, assume we can open it */
1724 if (!S_ISDIR(st_top.st_mode))
1725 return scanelf_fileat(dir_fd, path, &st_top);
1726
1727 /* now scan the dir looking for fun stuff */
1728 subdir_fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
1729 if (subdir_fd == -1)
1730 dir = NULL;
1731 else
1732 dir = fdopendir(subdir_fd);
1733 if (dir == NULL) {
1734 if (subdir_fd != -1)
1735 close(subdir_fd);
1736 else if (be_verbose > 2)
1737 printf("%s: skipping dir: %s\n", path, strerror(errno));
1738 return 1;
1739 }
1740 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1741
1742 subpath = stpcpy(buf, path);
1743 if (subpath[-1] != '/')
1744 *subpath++ = '/';
1745 pathlen = subpath - buf;
1746 while ((dentry = readdir(dir))) {
1747 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1748 continue;
1749
1750 if (fstatat(subdir_fd, dentry->d_name, &st, AT_SYMLINK_NOFOLLOW) == -1)
1751 continue;
1752
1753 len = strlen(dentry->d_name);
1754 if (len + pathlen + 1 >= sizeof(buf)) {
1755 warnf("Skipping '%s%s': len > sizeof(buf); %zu > %zu\n",
1756 path, dentry->d_name, len + pathlen + 1, sizeof(buf));
1757 continue;
1758 }
1759 memcpy(subpath, dentry->d_name, len);
1760 subpath[len] = '\0';
1761
1762 if (S_ISREG(st.st_mode))
1763 ret = scanelf_fileat(dir_fd, buf, &st);
1764 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1765 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1766 ret = scanelf_dirat(dir_fd, buf);
1767 }
1768 }
1769 closedir(dir);
1770
1771 return ret;
1772 }
1773 static int scanelf_dir(const char *path)
1774 {
1775 return scanelf_dirat(root_fd, root_rel_path(path));
1776 }
1777
1778 static int scanelf_from_file(const char *filename)
1779 {
1780 FILE *fp;
1781 char *p, *path;
1782 size_t len;
1783 int ret;
1784
1785 if (strcmp(filename, "-") == 0)
1786 fp = stdin;
1787 else if ((fp = fopen(filename, "r")) == NULL)
1788 return 1;
1789
1790 path = NULL;
1791 len = 0;
1792 ret = 0;
1793 while (getline(&path, &len, fp) != -1) {
1794 if ((p = strchr(path, '\n')) != NULL)
1795 *p = 0;
1796 search_path = path;
1797 ret = scanelf_dir(path);
1798 }
1799 free(path);
1800
1801 if (fp != stdin)
1802 fclose(fp);
1803
1804 return ret;
1805 }
1806
1807 #if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1808
1809 static int _load_ld_cache_config(const char *fname)
1810 {
1811 FILE *fp = NULL;
1812 char *p, *path;
1813 size_t len;
1814 int curr_fd = -1;
1815
1816 fp = fopenat_r(root_fd, root_rel_path(fname));
1817 if (fp == NULL)
1818 return -1;
1819
1820 path = NULL;
1821 len = 0;
1822 while (getline(&path, &len, fp) != -1) {
1823 if ((p = strrchr(path, '\r')) != NULL)
1824 *p = 0;
1825 if ((p = strchr(path, '\n')) != NULL)
1826 *p = 0;
1827
1828 /* recursive includes of the same file will make this segfault. */
1829 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1830 glob_t gl;
1831 size_t x;
1832 const char *gpath;
1833
1834 /* re-use existing path buffer ... need to be creative */
1835 if (path[8] != '/')
1836 gpath = memcpy(path + 3, "/etc/", 5);
1837 else
1838 gpath = path + 8;
1839 if (root_fd != AT_FDCWD) {
1840 if (curr_fd == -1) {
1841 curr_fd = open(".", O_RDONLY|O_CLOEXEC);
1842 if (fchdir(root_fd))
1843 errp("unable to change to root dir");
1844 }
1845 gpath = root_rel_path(gpath);
1846 }
1847
1848 if (glob(gpath, 0, NULL, &gl) == 0) {
1849 for (x = 0; x < gl.gl_pathc; ++x) {
1850 /* try to avoid direct loops */
1851 if (strcmp(gl.gl_pathv[x], fname) == 0)
1852 continue;
1853 _load_ld_cache_config(gl.gl_pathv[x]);
1854 }
1855 globfree(&gl);
1856 }
1857
1858 /* failed globs are ignored by glibc */
1859 continue;
1860 }
1861
1862 if (*path != '/')
1863 continue;
1864
1865 xarraypush_str(ldpaths, path);
1866 }
1867 free(path);
1868
1869 fclose(fp);
1870
1871 if (curr_fd != -1) {
1872 if (fchdir(curr_fd))
1873 {/* don't care */}
1874 close(curr_fd);
1875 }
1876
1877 return 0;
1878 }
1879
1880 #elif defined(__FreeBSD__) || defined(__DragonFly__)
1881
1882 static int _load_ld_cache_config(const char *fname)
1883 {
1884 FILE *fp = NULL;
1885 char *b = NULL, *p;
1886 struct elfhints_hdr hdr;
1887
1888 fp = fopenat_r(root_fd, root_rel_path(fname));
1889 if (fp == NULL)
1890 return -1;
1891
1892 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1893 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1894 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1895 {
1896 fclose(fp);
1897 return -1;
1898 }
1899
1900 b = xmalloc(hdr.dirlistlen + 1);
1901 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1902 fclose(fp);
1903 free(b);
1904 return -1;
1905 }
1906
1907 while ((p = strsep(&b, ":"))) {
1908 if (*p == '\0')
1909 continue;
1910 xarraypush_str(ldpaths, p);
1911 }
1912
1913 free(b);
1914 fclose(fp);
1915 return 0;
1916 }
1917
1918 #else
1919 #ifdef __ELF__
1920 #warning Cache config support not implemented for your target
1921 #endif
1922 static int _load_ld_cache_config(const char *fname)
1923 {
1924 return 0;
1925 }
1926 #endif
1927
1928 static void load_ld_cache_config(const char *fname)
1929 {
1930 bool scan_l, scan_ul, scan_ull;
1931 size_t n;
1932 const char *ldpath;
1933
1934 _load_ld_cache_config(fname);
1935
1936 scan_l = scan_ul = scan_ull = false;
1937 array_for_each(ldpaths, n, ldpath) {
1938 if (!scan_l && !strcmp(ldpath, "/lib")) scan_l = true;
1939 if (!scan_ul && !strcmp(ldpath, "/usr/lib")) scan_ul = true;
1940 if (!scan_ull && !strcmp(ldpath, "/usr/local/lib")) scan_ull = true;
1941 }
1942
1943 if (!scan_l) xarraypush_str(ldpaths, "/lib");
1944 if (!scan_ul) xarraypush_str(ldpaths, "/usr/lib");
1945 if (!scan_ull) xarraypush_str(ldpaths, "/usr/local/lib");
1946 }
1947
1948 /* scan /etc/ld.so.conf for paths */
1949 static void scanelf_ldpath(void)
1950 {
1951 size_t n;
1952 const char *ldpath;
1953
1954 array_for_each(ldpaths, n, ldpath)
1955 scanelf_dir(ldpath);
1956 }
1957
1958 /* scan env PATH for paths */
1959 static void scanelf_envpath(void)
1960 {
1961 char *path, *p;
1962
1963 path = getenv("PATH");
1964 if (!path)
1965 err("PATH is not set in your env !");
1966 path = xstrdup(path);
1967
1968 while ((p = strrchr(path, ':')) != NULL) {
1969 scanelf_dir(p + 1);
1970 *p = 0;
1971 }
1972
1973 free(path);
1974 }
1975
1976 /* usage / invocation handling functions */ /* Free Flags: c d j u w G H J K P Q U W */
1977 #define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZCBhV"
1978 #define a_argument required_argument
1979 static struct option const long_opts[] = {
1980 {"path", no_argument, NULL, 'p'},
1981 {"ldpath", no_argument, NULL, 'l'},
1982 {"use-ldpath",no_argument, NULL, 129},
1983 {"root", a_argument, NULL, 128},
1984 {"recursive", no_argument, NULL, 'R'},
1985 {"mount", no_argument, NULL, 'm'},
1986 {"symlink", no_argument, NULL, 'y'},
1987 {"archives", no_argument, NULL, 'A'},
1988 {"ldcache", no_argument, NULL, 'L'},
1989 {"fix", no_argument, NULL, 'X'},
1990 {"setpax", a_argument, NULL, 'z'},
1991 {"pax", no_argument, NULL, 'x'},
1992 {"header", no_argument, NULL, 'e'},
1993 {"textrel", no_argument, NULL, 't'},
1994 {"rpath", no_argument, NULL, 'r'},
1995 {"needed", no_argument, NULL, 'n'},
1996 {"interp", no_argument, NULL, 'i'},
1997 {"bind", no_argument, NULL, 'b'},
1998 {"soname", no_argument, NULL, 'S'},
1999 {"symbol", a_argument, NULL, 's'},
2000 {"section", a_argument, NULL, 'k'},
2001 {"lib", a_argument, NULL, 'N'},
2002 {"gmatch", no_argument, NULL, 'g'},
2003 {"textrels", no_argument, NULL, 'T'},
2004 {"etype", a_argument, NULL, 'E'},
2005 {"bits", a_argument, NULL, 'M'},
2006 {"endian", no_argument, NULL, 'D'},
2007 {"osabi", no_argument, NULL, 'I'},
2008 {"eabi", no_argument, NULL, 'Y'},
2009 {"perms", a_argument, NULL, 'O'},
2010 {"size", no_argument, NULL, 'Z'},
2011 {"all", no_argument, NULL, 'a'},
2012 {"quiet", no_argument, NULL, 'q'},
2013 {"verbose", no_argument, NULL, 'v'},
2014 {"format", a_argument, NULL, 'F'},
2015 {"from", a_argument, NULL, 'f'},
2016 {"file", a_argument, NULL, 'o'},
2017 {"nocolor", no_argument, NULL, 'C'},
2018 {"nobanner", no_argument, NULL, 'B'},
2019 {"help", no_argument, NULL, 'h'},
2020 {"version", no_argument, NULL, 'V'},
2021 {NULL, no_argument, NULL, 0x0}
2022 };
2023
2024 static const char * const opts_help[] = {
2025 "Scan all directories in PATH environment",
2026 "Scan all directories in /etc/ld.so.conf",
2027 "Use ld.so.conf to show full path (use with -r/-n)",
2028 "Root directory (use with -l or -p)",
2029 "Scan directories recursively",
2030 "Don't recursively cross mount points",
2031 "Don't scan symlinks",
2032 "Scan archives (.a files)",
2033 "Utilize ld.so.cache to show full path (use with -r/-n)",
2034 "Try and 'fix' bad things (use with -r/-e)",
2035 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
2036 "Print PaX markings",
2037 "Print GNU_STACK/PT_LOAD markings",
2038 "Print TEXTREL information",
2039 "Print RPATH information",
2040 "Print NEEDED information",
2041 "Print INTERP information",
2042 "Print BIND information",
2043 "Print SONAME information",
2044 "Find a specified symbol",
2045 "Find a specified section",
2046 "Find a specified library",
2047 "Use regex rather than string compare (with -s); specify twice for case insensitive",
2048 "Locate cause of TEXTREL",
2049 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
2050 "Print only ELF files matching numeric bits",
2051 "Print Endianness",
2052 "Print OSABI",
2053 "Print EABI (EM_ARM Only)",
2054 "Print only ELF files matching octal permissions",
2055 "Print ELF file size",
2056 "Print all useful/simple info\n",
2057 "Only output 'bad' things",
2058 "Be verbose (can be specified more than once)",
2059 "Use specified format for output",
2060 "Read input stream from a filename",
2061 "Write output stream to a filename",
2062 "Don't emit color in output",
2063 "Don't display the header",
2064 "Print this help and exit",
2065 "Print version and exit",
2066 NULL
2067 };
2068
2069 /* display usage and exit */
2070 static void usage(int status)
2071 {
2072 const char a_arg[] = "<arg>";
2073 size_t a_arg_len = strlen(a_arg) + 2;
2074 size_t i;
2075 int optlen;
2076 printf("* Scan ELF binaries for stuff\n\n"
2077 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
2078 printf("Options: -[%s]\n", PARSE_FLAGS);
2079
2080 /* prescan the --long opt length to auto-align */
2081 optlen = 0;
2082 for (i = 0; long_opts[i].name; ++i) {
2083 int l = strlen(long_opts[i].name);
2084 if (long_opts[i].has_arg == a_argument)
2085 l += a_arg_len;
2086 optlen = max(l, optlen);
2087 }
2088
2089 for (i = 0; long_opts[i].name; ++i) {
2090 /* first output the short flag if it has one */
2091 if (long_opts[i].val > '~')
2092 printf(" ");
2093 else
2094 printf(" -%c, ", long_opts[i].val);
2095
2096 /* then the long flag */
2097 if (long_opts[i].has_arg == no_argument)
2098 printf("--%-*s", optlen, long_opts[i].name);
2099 else
2100 printf("--%s %s %*s", long_opts[i].name, a_arg,
2101 (int)(optlen - strlen(long_opts[i].name) - a_arg_len), "");
2102
2103 /* finally the help text */
2104 printf("* %s\n", opts_help[i]);
2105 }
2106
2107 puts("\nFor more information, see the scanelf(1) manpage");
2108 exit(status);
2109 }
2110
2111 /* parse command line arguments and preform needed actions */
2112 #define do_pax_state(option, flag) \
2113 if (islower(option)) { \
2114 flags &= ~PF_##flag; \
2115 flags |= PF_NO##flag; \
2116 } else { \
2117 flags &= ~PF_NO##flag; \
2118 flags |= PF_##flag; \
2119 }
2120 static void parse_delimited(array_t *arr, char *arg, const char *delim)
2121 {
2122 char *ele = strtok(arg, delim);
2123 if (!ele) /* edge case: -s '' */
2124 xarraypush_str(arr, "");
2125 while (ele) {
2126 xarraypush_str(arr, ele);
2127 ele = strtok(NULL, delim);
2128 }
2129 }
2130 static int parseargs(int argc, char *argv[])
2131 {
2132 int i;
2133 const char *from_file = NULL;
2134 int ret = 0;
2135 char load_cache_config = 0;
2136
2137 opterr = 0;
2138 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
2139 switch (i) {
2140
2141 case 'V':
2142 printf("pax-utils-%s: %s compiled %s\n%s\n"
2143 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
2144 VERSION, __FILE__, __DATE__, rcsid, argv0);
2145 exit(EXIT_SUCCESS);
2146 break;
2147 case 'h': usage(EXIT_SUCCESS); break;
2148 case 'f':
2149 if (from_file) warn("You prob don't want to specify -f twice");
2150 from_file = optarg;
2151 break;
2152 case 'E':
2153 /* historically, this was comma delimited */
2154 parse_delimited(match_etypes, optarg, ",");
2155 break;
2156 case 'M':
2157 match_bits = atoi(optarg);
2158 if (match_bits == 0) {
2159 if (strcmp(optarg, "ELFCLASS32") == 0)
2160 match_bits = 32;
2161 if (strcmp(optarg, "ELFCLASS64") == 0)
2162 match_bits = 64;
2163 }
2164 break;
2165 case 'O':
2166 if (sscanf(optarg, "%o", &match_perms) == -1)
2167 match_bits = 0;
2168 break;
2169 case 'o': {
2170 if (freopen(optarg, "w", stdout) == NULL)
2171 errp("Could not freopen(%s)", optarg);
2172 break;
2173 }
2174 case 'k':
2175 xarraypush_str(find_section_arr, optarg);
2176 break;
2177 case 's':
2178 /* historically, this was comma delimited */
2179 parse_delimited(find_sym_arr, optarg, ",");
2180 break;
2181 case 'N':
2182 xarraypush_str(find_lib_arr, optarg);
2183 break;
2184 case 'F': {
2185 if (out_format) warn("You prob don't want to specify -F twice");
2186 out_format = optarg;
2187 break;
2188 }
2189 case 'z': {
2190 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
2191 size_t x;
2192
2193 for (x = 0; x < strlen(optarg); x++) {
2194 switch (optarg[x]) {
2195 case 'p':
2196 case 'P':
2197 do_pax_state(optarg[x], PAGEEXEC);
2198 break;
2199 case 's':
2200 case 'S':
2201 do_pax_state(optarg[x], SEGMEXEC);
2202 break;
2203 case 'm':
2204 case 'M':
2205 do_pax_state(optarg[x], MPROTECT);
2206 break;
2207 case 'e':
2208 case 'E':
2209 do_pax_state(optarg[x], EMUTRAMP);
2210 break;
2211 case 'r':
2212 case 'R':
2213 do_pax_state(optarg[x], RANDMMAP);
2214 break;
2215 case 'x':
2216 case 'X':
2217 do_pax_state(optarg[x], RANDEXEC);
2218 break;
2219 default:
2220 break;
2221 }
2222 }
2223 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
2224 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
2225 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
2226 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
2227 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
2228 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
2229 setpax = flags;
2230 break;
2231 }
2232 case 'Z': show_size = 1; break;
2233 case 'g': ++g_match; break;
2234 case 'L': load_cache_config = use_ldcache = 1; break;
2235 case 'y': scan_symlink = 0; break;
2236 case 'A': scan_archives = 1; break;
2237 case 'C': color_init(true); break;
2238 case 'B': show_banner = 0; break;
2239 case 'l': load_cache_config = scan_ldpath = 1; break;
2240 case 'p': scan_envpath = 1; break;
2241 case 'R': dir_recurse = 1; break;
2242 case 'm': dir_crossmount = 0; break;
2243 case 'X': ++fix_elf; break;
2244 case 'x': show_pax = 1; break;
2245 case 'e': show_phdr = 1; break;
2246 case 't': show_textrel = 1; break;
2247 case 'r': show_rpath = 1; break;
2248 case 'n': show_needed = 1; break;
2249 case 'i': show_interp = 1; break;
2250 case 'b': show_bind = 1; break;
2251 case 'S': show_soname = 1; break;
2252 case 'T': show_textrels = 1; break;
2253 case 'q': be_quiet = min(be_quiet, 20) + 1; break;
2254 case 'v': be_verbose = min(be_verbose, 20) + 1; break;
2255 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
2256 case 'D': show_endian = 1; break;
2257 case 'I': show_osabi = 1; break;
2258 case 'Y': show_eabi = 1; break;
2259 case 128:
2260 root_fd = open(optarg, O_RDONLY|O_CLOEXEC);
2261 if (root_fd == -1)
2262 err("Could not open root: %s", optarg);
2263 break;
2264 case 129: load_cache_config = use_ldpath = 1; break;
2265 case ':':
2266 err("Option '%c' is missing parameter", optopt);
2267 case '?':
2268 err("Unknown option '%c' or argument missing", optopt);
2269 default:
2270 err("Unhandled option '%c'; please report this", i);
2271 }
2272 }
2273 if (show_textrels && be_verbose)
2274 objdump = which("objdump", "OBJDUMP");
2275 /* precompile all the regexes */
2276 if (g_match) {
2277 regex_t preg;
2278 const char *this_sym;
2279 size_t n;
2280 int flags = REG_EXTENDED | REG_NOSUB | (g_match > 1 ? REG_ICASE : 0);
2281
2282 array_for_each(find_sym_arr, n, this_sym) {
2283 /* see scanelf_match_symname for logic info */
2284 switch (this_sym[0]) {
2285 case '%':
2286 while (*(this_sym++))
2287 if (*this_sym == '%') {
2288 ++this_sym;
2289 break;
2290 }
2291 break;
2292 case '+':
2293 case '-':
2294 ++this_sym;
2295 break;
2296 }
2297 if (*this_sym == '*')
2298 ++this_sym;
2299
2300 ret = regcomp(&preg, this_sym, flags);
2301 if (ret) {
2302 char err[256];
2303 regerror(ret, &preg, err, sizeof(err));
2304 err("regcomp of %s failed: %s", this_sym, err);
2305 }
2306 xarraypush(find_sym_regex_arr, &preg, sizeof(preg));
2307 }
2308 }
2309 /* flatten arrays for display */
2310 find_sym = array_flatten_str(find_sym_arr);
2311 find_lib = array_flatten_str(find_lib_arr);
2312 find_section = array_flatten_str(find_section_arr);
2313 /* let the format option override all other options */
2314 if (out_format) {
2315 show_pax = show_phdr = show_textrel = show_rpath = \
2316 show_needed = show_interp = show_bind = show_soname = \
2317 show_textrels = show_perms = show_endian = show_size = \
2318 show_osabi = show_eabi = 0;
2319 for (i = 0; out_format[i]; ++i) {
2320 if (!IS_MODIFIER(out_format[i])) continue;
2321
2322 switch (out_format[++i]) {
2323 case '+': break;
2324 case '%': break;
2325 case '#': break;
2326 case 'F': break;
2327 case 'p': break;
2328 case 'f': break;
2329 case 'k': break;
2330 case 's': break;
2331 case 'N': break;
2332 case 'o': break;
2333 case 'a': break;
2334 case 'M': break;
2335 case 'Z': show_size = 1; break;
2336 case 'D': show_endian = 1; break;
2337 case 'I': show_osabi = 1; break;
2338 case 'Y': show_eabi = 1; break;
2339 case 'O': show_perms = 1; break;
2340 case 'x': show_pax = 1; break;
2341 case 'e': show_phdr = 1; break;
2342 case 't': show_textrel = 1; break;
2343 case 'r': show_rpath = 1; break;
2344 case 'n': show_needed = 1; break;
2345 case 'i': show_interp = 1; break;
2346 case 'b': show_bind = 1; break;
2347 case 'S': show_soname = 1; break;
2348 case 'T': show_textrels = 1; break;
2349 default:
2350 err("invalid format specifier '%c' (byte %i)",
2351 out_format[i], i+1);
2352 }
2353 }
2354
2355 /* construct our default format */
2356 } else {
2357 size_t fmt_len = 30;
2358 out_format = xmalloc(sizeof(char) * fmt_len);
2359 *out_format = '\0';
2360 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
2361 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
2362 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
2363 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
2364 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
2365 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
2366 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
2367 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
2368 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
2369 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
2370 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
2371 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
2372 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
2373 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
2374 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
2375 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
2376 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
2377 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
2378 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
2379 }
2380 if (be_verbose > 2) printf("Format: %s\n", out_format);
2381
2382 /* now lets actually do the scanning */
2383 if (load_cache_config)
2384 load_ld_cache_config(__PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
2385 if (scan_ldpath) scanelf_ldpath();
2386 if (scan_envpath) scanelf_envpath();
2387 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
2388 from_file = "-";
2389 if (from_file) {
2390 scanelf_from_file(from_file);
2391 from_file = *argv;
2392 }
2393 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
2394 err("Nothing to scan !?");
2395 while (optind < argc) {
2396 search_path = argv[optind++];
2397 ret = scanelf_dir(search_path);
2398 }
2399
2400 #ifdef __PAX_UTILS_CLEANUP
2401 /* clean up */
2402 xarrayfree(ldpaths);
2403 xarrayfree(find_sym_arr);
2404 xarrayfree(find_lib_arr);
2405 xarrayfree(find_section_arr);
2406 free(find_sym);
2407 free(find_lib);
2408 free(find_section);
2409 {
2410 size_t n;
2411 regex_t *preg;
2412 array_for_each(find_sym_regex_arr, n, preg)
2413 regfree(preg);
2414 xarrayfree(find_sym_regex_arr);
2415 }
2416
2417 if (ldcache != 0)
2418 munmap(ldcache, ldcache_size);
2419 #endif
2420
2421 return ret;
2422 }
2423
2424 static char **get_split_env(const char *envvar)
2425 {
2426 const char *delims = " \t\n";
2427 char **envvals = NULL;
2428 char *env, *s;
2429 int nentry;
2430
2431 if ((env = getenv(envvar)) == NULL)
2432 return NULL;
2433
2434 env = xstrdup(env);
2435 if (env == NULL)
2436 return NULL;
2437
2438 s = strtok(env, delims);
2439 if (s == NULL) {
2440 free(env);
2441 return NULL;
2442 }
2443
2444 nentry = 0;
2445 while (s != NULL) {
2446 ++nentry;
2447 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
2448 envvals[nentry-1] = s;
2449 s = strtok(NULL, delims);
2450 }
2451 envvals[nentry] = NULL;
2452
2453 /* don't want to free(env) as it contains the memory that backs
2454 * the envvals array of strings */
2455 return envvals;
2456 }
2457
2458 static void parseenv(void)
2459 {
2460 color_init(false);
2461 qa_textrels = get_split_env("QA_TEXTRELS");
2462 qa_execstack = get_split_env("QA_EXECSTACK");
2463 qa_wx_load = get_split_env("QA_WX_LOAD");
2464 }
2465
2466 #ifdef __PAX_UTILS_CLEANUP
2467 static void cleanup(void)
2468 {
2469 free(out_format);
2470 free(qa_textrels);
2471 free(qa_execstack);
2472 free(qa_wx_load);
2473 }
2474 #endif
2475
2476 int main(int argc, char *argv[])
2477 {
2478 int ret;
2479 if (argc < 2)
2480 usage(EXIT_FAILURE);
2481 parseenv();
2482 ret = parseargs(argc, argv);
2483 fclose(stdout);
2484 #ifdef __PAX_UTILS_CLEANUP
2485 cleanup();
2486 warn("The calls to add/delete heap should be off:\n"
2487 "\t- 1 due to the out_buffer not being freed in scanelf_fileat()\n"
2488 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
2489 #endif
2490 return ret;
2491 }
2492
2493 /* Match filename against entries in matchlist, return TRUE
2494 * if the file is listed */
2495 static int file_matches_list(const char *filename, char **matchlist)
2496 {
2497 char **file;
2498 char *match;
2499 char buf[__PAX_UTILS_PATH_MAX];
2500
2501 if (matchlist == NULL)
2502 return 0;
2503
2504 for (file = matchlist; *file != NULL; file++) {
2505 if (search_path) {
2506 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2507 match = buf;
2508 } else {
2509 match = *file;
2510 }
2511 if (fnmatch(match, filename, 0) == 0)
2512 return 1;
2513 }
2514 return 0;
2515 }

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