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Revision 1.267 - (show annotations) (download) (as text)
Sun Oct 19 07:31:20 2014 UTC (4 years, 6 months ago) by vapier
Branch: MAIN
Changes since 1.266: +23 -11 lines
File MIME type: text/x-csrc
scanelf: do not use debug syms with runtime strings or vice versa

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 1.266 2014/06/18 03:16:52 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 1.266 2014/06/18 03:16:52 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 } \
218 }
219 GET_SYMTABS(32)
220 GET_SYMTABS(64)
221
222 if (*sym && *str)
223 return;
224
225 /*
226 * damn, they're really going to make us work for it huh?
227 * reconstruct the section header info out of the dynamic
228 * tags so we can see what symbols this guy uses at runtime.
229 */
230 #define GET_SYMTABS_DT(B) \
231 if (elf->elf_class == ELFCLASS ## B) { \
232 size_t i; \
233 static Elf ## B ## _Shdr sym_shdr, str_shdr; \
234 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
235 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
236 Elf ## B ## _Addr vsym, vstr, vhash, vgnu_hash; \
237 Elf ## B ## _Dyn *dyn; \
238 Elf ## B ## _Off offset; \
239 \
240 /* lookup symbols used at runtime with DT_SYMTAB / DT_STRTAB */ \
241 vsym = vstr = vhash = vgnu_hash = 0; \
242 memset(&sym_shdr, 0, sizeof(sym_shdr)); \
243 memset(&str_shdr, 0, sizeof(str_shdr)); \
244 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
245 if (EGET(phdr[i].p_type) != PT_DYNAMIC) \
246 continue; \
247 \
248 offset = EGET(phdr[i].p_offset); \
249 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
250 continue; \
251 \
252 dyn = DYN ## B (elf->vdata + offset); \
253 while (EGET(dyn->d_tag) != DT_NULL) { \
254 switch (EGET(dyn->d_tag)) { \
255 case DT_SYMTAB: vsym = EGET(dyn->d_un.d_val); break; \
256 case DT_SYMENT: sym_shdr.sh_entsize = dyn->d_un.d_val; break; \
257 case DT_STRTAB: vstr = EGET(dyn->d_un.d_val); break; \
258 case DT_STRSZ: str_shdr.sh_size = dyn->d_un.d_val; break; \
259 case DT_HASH: vhash = EGET(dyn->d_un.d_val); break; \
260 /*case DT_GNU_HASH: vgnu_hash = EGET(dyn->d_un.d_val); break;*/ \
261 } \
262 ++dyn; \
263 } \
264 if (vsym && vstr) \
265 break; \
266 } \
267 if (!vsym || !vstr || !(vhash || vgnu_hash)) \
268 return; \
269 \
270 /* calc offset into the ELF by finding the load addr of the syms */ \
271 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
272 Elf ## B ## _Addr vaddr = EGET(phdr[i].p_vaddr); \
273 Elf ## B ## _Addr filesz = EGET(phdr[i].p_filesz); \
274 offset = EGET(phdr[i].p_offset); \
275 \
276 if (EGET(phdr[i].p_type) != PT_LOAD) \
277 continue; \
278 \
279 if (vhash >= vaddr && vhash < vaddr + filesz) { \
280 /* Scan the hash table to see how many entries we have */ \
281 Elf32_Word max_sym_idx = 0; \
282 Elf32_Word *hashtbl = elf->vdata + offset + (vhash - vaddr); \
283 Elf32_Word b, nbuckets = EGET(hashtbl[0]); \
284 Elf32_Word nchains = EGET(hashtbl[1]); \
285 Elf32_Word *buckets = &hashtbl[2]; \
286 Elf32_Word *chains = &buckets[nbuckets]; \
287 Elf32_Word sym_idx; \
288 \
289 for (b = 0; b < nbuckets; ++b) { \
290 if (!buckets[b]) \
291 continue; \
292 for (sym_idx = buckets[b]; sym_idx < nchains && sym_idx; sym_idx = chains[sym_idx]) \
293 if (max_sym_idx < sym_idx) \
294 max_sym_idx = sym_idx; \
295 } \
296 ESET(sym_shdr.sh_size, sym_shdr.sh_entsize * max_sym_idx); \
297 } \
298 \
299 if (vsym >= vaddr && vsym < vaddr + filesz) { \
300 ESET(sym_shdr.sh_offset, offset + (vsym - vaddr)); \
301 *sym = &sym_shdr; \
302 } \
303 \
304 if (vstr >= vaddr && vstr < vaddr + filesz) { \
305 ESET(str_shdr.sh_offset, offset + (vstr - vaddr)); \
306 *str = &str_shdr; \
307 } \
308 } \
309 }
310 GET_SYMTABS_DT(32)
311 GET_SYMTABS_DT(64)
312 }
313
314 static char *scanelf_file_pax(elfobj *elf, char *found_pax)
315 {
316 static char ret[7];
317 unsigned long i, shown;
318
319 if (!show_pax) return NULL;
320
321 shown = 0;
322 memset(&ret, 0, sizeof(ret));
323
324 if (elf->phdr) {
325 #define SHOW_PAX(B) \
326 if (elf->elf_class == ELFCLASS ## B) { \
327 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
328 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
329 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
330 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
331 continue; \
332 if (fix_elf && setpax) { \
333 /* set the paxctl flags */ \
334 ESET(phdr[i].p_flags, setpax); \
335 } \
336 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
337 continue; \
338 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
339 *found_pax = 1; \
340 ++shown; \
341 break; \
342 } \
343 }
344 SHOW_PAX(32)
345 SHOW_PAX(64)
346 }
347
348 /* Note: We do not support setting EI_PAX if not PT_PAX_FLAGS
349 * was found. This is known to break ELFs on glibc systems,
350 * and mainline PaX has deprecated use of this for a long time.
351 * We could support changing PT_GNU_STACK, but that doesn't
352 * seem like it's worth the effort. #411919
353 */
354
355 /* fall back to EI_PAX if no PT_PAX was found */
356 if (!*ret) {
357 static char *paxflags;
358 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
359 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
360 *found_pax = 1;
361 return (be_wewy_wewy_quiet ? NULL : paxflags);
362 }
363 strncpy(ret, paxflags, sizeof(ret));
364 }
365
366 if (be_wewy_wewy_quiet || (be_quiet && !shown))
367 return NULL;
368 else
369 return ret;
370 }
371
372 static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
373 {
374 static char ret[12];
375 char *found;
376 unsigned long i, shown, multi_stack, multi_relro, multi_load;
377
378 if (!show_phdr) return NULL;
379
380 memcpy(ret, "--- --- ---\0", 12);
381
382 shown = 0;
383 multi_stack = multi_relro = multi_load = 0;
384
385 #define NOTE_GNU_STACK ".note.GNU-stack"
386 #define SHOW_PHDR(B) \
387 if (elf->elf_class == ELFCLASS ## B) { \
388 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
389 Elf ## B ## _Off offset; \
390 uint32_t flags, check_flags; \
391 if (elf->phdr != NULL) { \
392 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
393 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
394 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
395 if (multi_stack++) \
396 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
397 if (file_matches_list(elf->filename, qa_execstack)) \
398 continue; \
399 found = found_phdr; \
400 offset = 0; \
401 check_flags = PF_X; \
402 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
403 if (multi_relro++) \
404 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
405 found = found_relro; \
406 offset = 4; \
407 check_flags = PF_X; \
408 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
409 if (file_matches_list(elf->filename, qa_wx_load)) \
410 continue; \
411 found = found_load; \
412 offset = 8; \
413 check_flags = PF_W|PF_X; \
414 } else \
415 continue; \
416 flags = EGET(phdr[i].p_flags); \
417 if (be_quiet && ((flags & check_flags) != check_flags)) \
418 continue; \
419 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
420 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
421 ret[3] = ret[7] = '!'; \
422 flags = EGET(phdr[i].p_flags); \
423 } \
424 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
425 *found = 1; \
426 ++shown; \
427 } \
428 } else if (elf->shdr != NULL) { \
429 /* no program headers which means this is prob an object file */ \
430 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
431 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
432 char *str; \
433 if ((void*)strtbl > elf->data_end) \
434 goto skip_this_shdr##B; \
435 /* let's flag -w/+x object files since the final ELF will most likely \
436 * need write access to the stack (who doesn't !?). so the combined \
437 * output will bring in +w automatically and that's bad. \
438 */ \
439 check_flags = /*SHF_WRITE|*/SHF_EXECINSTR; \
440 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
441 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
442 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
443 str = elf->data + offset; \
444 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
445 if (!strcmp(str, NOTE_GNU_STACK)) { \
446 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
447 flags = EGET(shdr[i].sh_flags); \
448 if (be_quiet && ((flags & check_flags) != check_flags)) \
449 continue; \
450 ++*found_phdr; \
451 shown = 1; \
452 if (flags & SHF_WRITE) ret[0] = 'W'; \
453 if (flags & SHF_ALLOC) ret[1] = 'A'; \
454 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
455 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
456 break; \
457 } \
458 } \
459 skip_this_shdr##B: \
460 if (!multi_stack) { \
461 if (file_matches_list(elf->filename, qa_execstack)) \
462 return NULL; \
463 *found_phdr = 1; \
464 shown = 1; \
465 memcpy(ret, "!WX", 3); \
466 } \
467 } \
468 }
469 SHOW_PHDR(32)
470 SHOW_PHDR(64)
471
472 if (be_wewy_wewy_quiet || (be_quiet && !shown))
473 return NULL;
474 else
475 return ret;
476 }
477
478 /*
479 * See if this ELF contains a DT_TEXTREL tag in any of its
480 * PT_DYNAMIC sections.
481 */
482 static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
483 {
484 static const char *ret = "TEXTREL";
485 unsigned long i;
486
487 if (!show_textrel && !show_textrels) return NULL;
488
489 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
490
491 if (elf->phdr) {
492 #define SHOW_TEXTREL(B) \
493 if (elf->elf_class == ELFCLASS ## B) { \
494 Elf ## B ## _Dyn *dyn; \
495 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
496 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
497 Elf ## B ## _Off offset; \
498 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
499 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
500 offset = EGET(phdr[i].p_offset); \
501 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
502 dyn = DYN ## B (elf->vdata + offset); \
503 while (EGET(dyn->d_tag) != DT_NULL) { \
504 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
505 *found_textrel = 1; \
506 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
507 return (be_wewy_wewy_quiet ? NULL : ret); \
508 } \
509 ++dyn; \
510 } \
511 } }
512 SHOW_TEXTREL(32)
513 SHOW_TEXTREL(64)
514 }
515
516 if (be_quiet || be_wewy_wewy_quiet)
517 return NULL;
518 else
519 return " - ";
520 }
521
522 /*
523 * Scan the .text section to see if there are any relocations in it.
524 * Should rewrite this to check PT_LOAD sections that are marked
525 * Executable rather than the section named '.text'.
526 */
527 static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
528 {
529 unsigned long s, r, rmax;
530 void *symtab_void, *strtab_void, *text_void;
531
532 if (!show_textrels) return NULL;
533
534 /* don't search for TEXTREL's if the ELF doesn't have any */
535 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
536 if (!*found_textrel) return NULL;
537
538 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
539 text_void = elf_findsecbyname(elf, ".text");
540
541 if (symtab_void && strtab_void && text_void && elf->shdr) {
542 #define SHOW_TEXTRELS(B) \
543 if (elf->elf_class == ELFCLASS ## B) { \
544 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
545 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
546 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
547 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
548 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
549 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
550 uint ## B ## _t memsz = EGET(text->sh_size); \
551 Elf ## B ## _Rel *rel; \
552 Elf ## B ## _Rela *rela; \
553 /* search the section headers for relocations */ \
554 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
555 uint32_t sh_type = EGET(shdr[s].sh_type); \
556 if (sh_type == SHT_REL) { \
557 rel = REL ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
558 rela = NULL; \
559 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
560 } else if (sh_type == SHT_RELA) { \
561 rel = NULL; \
562 rela = RELA ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
563 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
564 } else \
565 continue; \
566 /* now see if any of the relocs are in the .text */ \
567 for (r = 0; r < rmax; ++r) { \
568 unsigned long sym_max; \
569 Elf ## B ## _Addr offset_tmp; \
570 Elf ## B ## _Sym *func; \
571 Elf ## B ## _Sym *sym; \
572 Elf ## B ## _Addr r_offset; \
573 uint ## B ## _t r_info; \
574 if (sh_type == SHT_REL) { \
575 r_offset = EGET(rel[r].r_offset); \
576 r_info = EGET(rel[r].r_info); \
577 } else { \
578 r_offset = EGET(rela[r].r_offset); \
579 r_info = EGET(rela[r].r_info); \
580 } \
581 /* make sure this relocation is inside of the .text */ \
582 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
583 if (be_verbose <= 2) continue; \
584 } else \
585 *found_textrels = 1; \
586 /* locate this relocation symbol name */ \
587 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
588 if ((void*)sym > elf->data_end) { \
589 warn("%s: corrupt ELF symbol", elf->filename); \
590 continue; \
591 } \
592 sym_max = ELF ## B ## _R_SYM(r_info); \
593 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
594 sym += sym_max; \
595 else \
596 sym = NULL; \
597 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
598 /* show the raw details about this reloc */ \
599 printf(" %s: ", elf->base_filename); \
600 if (sym && sym->st_name) \
601 printf("%s", elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
602 else \
603 printf("(memory/data?)"); \
604 printf(" [0x%lX]", (unsigned long)r_offset); \
605 /* now try to find the closest symbol that this rel is probably in */ \
606 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
607 func = NULL; \
608 offset_tmp = 0; \
609 while (sym_max--) { \
610 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
611 func = sym; \
612 offset_tmp = EGET(sym->st_value); \
613 } \
614 ++sym; \
615 } \
616 printf(" in "); \
617 if (func && func->st_name) { \
618 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
619 if (r_offset > EGET(func->st_size)) \
620 printf("(optimized out: previous %s)", func_name); \
621 else \
622 printf("%s", func_name); \
623 } else \
624 printf("(optimized out)"); \
625 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
626 if (be_verbose && objdump) { \
627 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
628 char *sysbuf; \
629 size_t syslen; \
630 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"; \
631 syslen = sizeof(sysfmt) + strlen(objdump) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
632 sysbuf = xmalloc(syslen); \
633 if (end_addr < r_offset) \
634 /* not uncommon when things are optimized out */ \
635 end_addr = r_offset + 0x100; \
636 snprintf(sysbuf, syslen, sysfmt, \
637 objdump, \
638 (unsigned long)offset_tmp, \
639 (unsigned long)end_addr, \
640 elf->filename, \
641 (unsigned long)r_offset); \
642 fflush(stdout); \
643 if (system(sysbuf)) {/* don't care */} \
644 fflush(stdout); \
645 free(sysbuf); \
646 } \
647 } \
648 } }
649 SHOW_TEXTRELS(32)
650 SHOW_TEXTRELS(64)
651 }
652 if (!*found_textrels)
653 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
654
655 return NULL;
656 }
657
658 static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
659 {
660 struct stat st;
661 switch (*item) {
662 case '/': break;
663 case '.':
664 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
665 break;
666 case ':':
667 case '\0':
668 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
669 break;
670 case '$':
671 if (fstat(elf->fd, &st) != -1)
672 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
673 warnf("Security problem with %s='%s' in %s with mode set of %o",
674 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
675 break;
676 default:
677 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
678 break;
679 }
680 }
681 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
682 {
683 unsigned long i;
684 char *rpath, *runpath, **r;
685 void *strtbl_void;
686
687 if (!show_rpath) return;
688
689 strtbl_void = elf_findsecbyname(elf, ".dynstr");
690 rpath = runpath = NULL;
691
692 if (elf->phdr && strtbl_void) {
693 #define SHOW_RPATH(B) \
694 if (elf->elf_class == ELFCLASS ## B) { \
695 Elf ## B ## _Dyn *dyn; \
696 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
697 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
698 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
699 Elf ## B ## _Off offset; \
700 Elf ## B ## _Xword word; \
701 /* Scan all the program headers */ \
702 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
703 /* Just scan dynamic headers */ \
704 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
705 offset = EGET(phdr[i].p_offset); \
706 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
707 /* Just scan dynamic RPATH/RUNPATH headers */ \
708 dyn = DYN ## B (elf->vdata + offset); \
709 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
710 if (word == DT_RPATH) { \
711 r = &rpath; \
712 } else if (word == DT_RUNPATH) { \
713 r = &runpath; \
714 } else { \
715 ++dyn; \
716 continue; \
717 } \
718 /* Verify the memory is somewhat sane */ \
719 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
720 if (offset < (Elf ## B ## _Off)elf->len) { \
721 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
722 *r = elf->data + offset; \
723 /* cache the length in case we need to nuke this section later on */ \
724 if (fix_elf) \
725 offset = strlen(*r); \
726 /* If quiet, don't output paths in ld.so.conf */ \
727 if (be_quiet) { \
728 size_t len; \
729 char *start, *end; \
730 /* note that we only 'chop' off leading known paths. */ \
731 /* since *r is read-only memory, we can only move the ptr forward. */ \
732 start = *r; \
733 /* scan each path in : delimited list */ \
734 while (start) { \
735 rpath_security_checks(elf, start, get_elfdtype(word)); \
736 end = strchr(start, ':'); \
737 len = (end ? abs(end - start) : strlen(start)); \
738 if (use_ldcache) { \
739 size_t n; \
740 const char *ldpath; \
741 array_for_each(ldpaths, n, ldpath) \
742 if (!strncmp(ldpath, start, len) && !ldpath[len]) { \
743 *r = end; \
744 /* corner case ... if RPATH reads "/usr/lib:", we want \
745 * to show ':' rather than '' */ \
746 if (end && end[1] != '\0') \
747 (*r)++; \
748 break; \
749 } \
750 } \
751 if (!*r || !end) \
752 break; \
753 else \
754 start = start + len + 1; \
755 } \
756 } \
757 if (*r) { \
758 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
759 /* just nuke it */ \
760 nuke_it##B: \
761 memset(*r, 0x00, offset); \
762 *r = NULL; \
763 ESET(dyn->d_tag, DT_DEBUG); \
764 ESET(dyn->d_un.d_ptr, 0); \
765 } else if (fix_elf) { \
766 /* try to clean "bad" paths */ \
767 size_t len, tmpdir_len; \
768 char *start, *end; \
769 const char *tmpdir; \
770 start = *r; \
771 tmpdir = (getenv("TMPDIR") ? : "."); \
772 tmpdir_len = strlen(tmpdir); \
773 while (1) { \
774 end = strchr(start, ':'); \
775 if (start == end) { \
776 eat_this_path##B: \
777 len = strlen(end); \
778 memmove(start, end+1, len); \
779 start[len-1] = '\0'; \
780 end = start - 1; \
781 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
782 if (!end) { \
783 if (start == *r) \
784 goto nuke_it##B; \
785 *--start = '\0'; \
786 } else \
787 goto eat_this_path##B; \
788 } \
789 if (!end) \
790 break; \
791 start = end + 1; \
792 } \
793 if (**r == '\0') \
794 goto nuke_it##B; \
795 } \
796 if (*r) \
797 *found_rpath = 1; \
798 } \
799 } \
800 ++dyn; \
801 } \
802 } }
803 SHOW_RPATH(32)
804 SHOW_RPATH(64)
805 }
806
807 if (be_wewy_wewy_quiet) return;
808
809 if (rpath && runpath) {
810 if (!strcmp(rpath, runpath)) {
811 xstrcat(ret, runpath, ret_len);
812 } else {
813 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
814 xchrcat(ret, '{', ret_len);
815 xstrcat(ret, rpath, ret_len);
816 xchrcat(ret, ',', ret_len);
817 xstrcat(ret, runpath, ret_len);
818 xchrcat(ret, '}', ret_len);
819 }
820 } else if (rpath || runpath)
821 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
822 else if (!be_quiet)
823 xstrcat(ret, " - ", ret_len);
824 }
825
826 /* Defines can be seen in glibc's sysdeps/generic/ldconfig.h */
827 #define LDSO_CACHE_MAGIC "ld.so-"
828 #define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
829 #define LDSO_CACHE_VER "1.7.0"
830 #define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
831 #define FLAG_ANY -1
832 #define FLAG_TYPE_MASK 0x00ff
833 #define FLAG_LIBC4 0x0000
834 #define FLAG_ELF 0x0001
835 #define FLAG_ELF_LIBC5 0x0002
836 #define FLAG_ELF_LIBC6 0x0003
837 #define FLAG_REQUIRED_MASK 0xff00
838 #define FLAG_SPARC_LIB64 0x0100
839 #define FLAG_IA64_LIB64 0x0200
840 #define FLAG_X8664_LIB64 0x0300
841 #define FLAG_S390_LIB64 0x0400
842 #define FLAG_POWERPC_LIB64 0x0500
843 #define FLAG_MIPS64_LIBN32 0x0600
844 #define FLAG_MIPS64_LIBN64 0x0700
845 #define FLAG_X8664_LIBX32 0x0800
846 #define FLAG_ARM_LIBHF 0x0900
847 #define FLAG_AARCH64_LIB64 0x0a00
848
849 #if defined(__GLIBC__) || defined(__UCLIBC__)
850
851 static char *lookup_cache_lib(elfobj *elf, const char *fname)
852 {
853 int fd;
854 char *strs;
855 static char buf[__PAX_UTILS_PATH_MAX] = "";
856 const char *cachefile = root_rel_path("/etc/ld.so.cache");
857 struct stat st;
858
859 typedef struct {
860 char magic[LDSO_CACHE_MAGIC_LEN];
861 char version[LDSO_CACHE_VER_LEN];
862 int nlibs;
863 } header_t;
864 header_t *header;
865
866 typedef struct {
867 int flags;
868 int sooffset;
869 int liboffset;
870 } libentry_t;
871 libentry_t *libent;
872
873 if (fname == NULL)
874 return NULL;
875
876 if (ldcache == NULL) {
877 if (fstatat(root_fd, cachefile, &st, 0))
878 return NULL;
879
880 fd = openat(root_fd, cachefile, O_RDONLY);
881 if (fd == -1)
882 return NULL;
883
884 /* cache these values so we only map/unmap the cache file once */
885 ldcache_size = st.st_size;
886 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
887 close(fd);
888
889 if (ldcache == MAP_FAILED) {
890 ldcache = NULL;
891 return NULL;
892 }
893
894 if (memcmp(header->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN) ||
895 memcmp(header->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
896 {
897 munmap(ldcache, ldcache_size);
898 ldcache = NULL;
899 return NULL;
900 }
901 } else
902 header = ldcache;
903
904 libent = ldcache + sizeof(header_t);
905 strs = (char *) &libent[header->nlibs];
906
907 for (fd = 0; fd < header->nlibs; ++fd) {
908 /* This should be more fine grained, but for now we assume that
909 * diff arches will not be cached together, and we ignore the
910 * the different multilib mips cases.
911 */
912 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
913 continue;
914 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
915 continue;
916
917 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
918 continue;
919
920 /* Return first hit because that is how the ldso rolls */
921 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
922 break;
923 }
924
925 return buf;
926 }
927
928 #elif defined(__NetBSD__)
929 static char *lookup_cache_lib(elfobj *elf, const char *fname)
930 {
931 static char buf[__PAX_UTILS_PATH_MAX] = "";
932 static struct stat st;
933 size_t n;
934 char *ldpath;
935
936 array_for_each(ldpath, n, ldpath) {
937 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", ldpath, fname) >= sizeof(buf))
938 continue; /* if the pathname is too long, or something went wrong, ignore */
939
940 if (stat(buf, &st) != 0)
941 continue; /* if the lib doesn't exist in *ldpath, look further */
942
943 /* NetBSD doesn't actually do sanity checks, it just loads the file
944 * and if that doesn't work, continues looking in other directories.
945 * This cannot easily be safely emulated, unfortunately. For now,
946 * just assume that if it exists, it's a valid library. */
947
948 return buf;
949 }
950
951 /* not found in any path */
952 return NULL;
953 }
954 #else
955 #ifdef __ELF__
956 #warning Cache support not implemented for your target
957 #endif
958 static char *lookup_cache_lib(elfobj *elf, const char *fname)
959 {
960 return NULL;
961 }
962 #endif
963
964 static char *lookup_config_lib(const char *fname)
965 {
966 static char buf[__PAX_UTILS_PATH_MAX] = "";
967 const char *ldpath;
968 size_t n;
969
970 array_for_each(ldpaths, n, ldpath) {
971 snprintf(buf, sizeof(buf), "%s/%s", root_rel_path(ldpath), fname);
972 if (faccessat(root_fd, buf, F_OK, AT_SYMLINK_NOFOLLOW) == 0)
973 return buf;
974 }
975
976 return NULL;
977 }
978
979 static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
980 {
981 unsigned long i;
982 char *needed;
983 void *strtbl_void;
984 char *p;
985
986 /*
987 * -n -> op==0 -> print all
988 * -N -> op==1 -> print requested
989 */
990 if ((op == 0 && !show_needed) || (op == 1 && !find_lib))
991 return NULL;
992
993 strtbl_void = elf_findsecbyname(elf, ".dynstr");
994
995 if (elf->phdr && strtbl_void) {
996 #define SHOW_NEEDED(B) \
997 if (elf->elf_class == ELFCLASS ## B) { \
998 Elf ## B ## _Dyn *dyn; \
999 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1000 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1001 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
1002 Elf ## B ## _Off offset; \
1003 size_t matched = 0; \
1004 /* Walk all the program headers to find the PT_DYNAMIC */ \
1005 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1006 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) \
1007 continue; \
1008 offset = EGET(phdr[i].p_offset); \
1009 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
1010 continue; \
1011 /* Walk all the dynamic tags to find NEEDED entries */ \
1012 dyn = DYN ## B (elf->vdata + offset); \
1013 while (EGET(dyn->d_tag) != DT_NULL) { \
1014 if (EGET(dyn->d_tag) == DT_NEEDED) { \
1015 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
1016 if (offset >= (Elf ## B ## _Off)elf->len) { \
1017 ++dyn; \
1018 continue; \
1019 } \
1020 needed = elf->data + offset; \
1021 if (op == 0) { \
1022 /* -n -> print all entries */ \
1023 if (!be_wewy_wewy_quiet) { \
1024 if (*found_needed) xchrcat(ret, ',', ret_len); \
1025 if (use_ldpath) { \
1026 if ((p = lookup_config_lib(needed)) != NULL) \
1027 needed = p; \
1028 } else if (use_ldcache) { \
1029 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
1030 needed = p; \
1031 } \
1032 xstrcat(ret, needed, ret_len); \
1033 } \
1034 *found_needed = 1; \
1035 } else { \
1036 /* -N -> print matching entries */ \
1037 size_t n; \
1038 const char *find_lib_name; \
1039 \
1040 array_for_each(find_lib_arr, n, find_lib_name) { \
1041 int invert = 1; \
1042 if (find_lib_name[0] == '!') \
1043 invert = 0, ++find_lib_name; \
1044 if (!strcmp(find_lib_name, needed) == invert) \
1045 ++matched; \
1046 } \
1047 \
1048 if (matched == array_cnt(find_lib_arr)) { \
1049 *found_lib = 1; \
1050 return (be_wewy_wewy_quiet ? NULL : find_lib); \
1051 } \
1052 } \
1053 } \
1054 ++dyn; \
1055 } \
1056 } }
1057 SHOW_NEEDED(32)
1058 SHOW_NEEDED(64)
1059 if (op == 0 && !*found_needed && be_verbose)
1060 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
1061 }
1062
1063 return NULL;
1064 }
1065 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
1066 {
1067 void *strtbl_void;
1068
1069 if (!show_interp) return NULL;
1070
1071 strtbl_void = elf_findsecbyname(elf, ".interp");
1072
1073 if (strtbl_void) {
1074 #define SHOW_INTERP(B) \
1075 if (elf->elf_class == ELFCLASS ## B) { \
1076 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
1077 *found_interp = 1; \
1078 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
1079 }
1080 SHOW_INTERP(32)
1081 SHOW_INTERP(64)
1082 } else {
1083 /* Walk all the program headers to find the PT_INTERP */
1084 #define SHOW_PT_INTERP(B) \
1085 if (elf->elf_class == ELFCLASS ## B) { \
1086 unsigned long i; \
1087 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1088 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1089 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1090 if (EGET(phdr[i].p_type) != PT_INTERP) \
1091 continue; \
1092 *found_interp = 1; \
1093 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(phdr[i].p_offset)); \
1094 } \
1095 }
1096 SHOW_PT_INTERP(32)
1097 SHOW_PT_INTERP(64)
1098 }
1099
1100 return NULL;
1101 }
1102 static const char *scanelf_file_bind(elfobj *elf, char *found_bind)
1103 {
1104 unsigned long i;
1105 struct stat s;
1106 bool dynamic = false;
1107
1108 if (!show_bind) return NULL;
1109 if (!elf->phdr) return NULL;
1110
1111 #define SHOW_BIND(B) \
1112 if (elf->elf_class == ELFCLASS ## B) { \
1113 Elf ## B ## _Dyn *dyn; \
1114 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1115 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1116 Elf ## B ## _Off offset; \
1117 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1118 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1119 dynamic = true; \
1120 offset = EGET(phdr[i].p_offset); \
1121 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
1122 dyn = DYN ## B (elf->vdata + offset); \
1123 while (EGET(dyn->d_tag) != DT_NULL) { \
1124 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
1125 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
1126 { \
1127 if (be_quiet) return NULL; \
1128 *found_bind = 1; \
1129 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
1130 } \
1131 ++dyn; \
1132 } \
1133 } \
1134 }
1135 SHOW_BIND(32)
1136 SHOW_BIND(64)
1137
1138 if (be_wewy_wewy_quiet) return NULL;
1139
1140 /* don't output anything if quiet mode and the ELF is static or not setuid */
1141 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
1142 return NULL;
1143 } else {
1144 *found_bind = 1;
1145 return dynamic ? "LAZY" : "STATIC";
1146 }
1147 }
1148 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
1149 {
1150 unsigned long i;
1151 char *soname;
1152 void *strtbl_void;
1153
1154 if (!show_soname) return NULL;
1155
1156 strtbl_void = elf_findsecbyname(elf, ".dynstr");
1157
1158 if (elf->phdr && strtbl_void) {
1159 #define SHOW_SONAME(B) \
1160 if (elf->elf_class == ELFCLASS ## B) { \
1161 Elf ## B ## _Dyn *dyn; \
1162 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1163 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1164 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
1165 Elf ## B ## _Off offset; \
1166 /* only look for soname in shared objects */ \
1167 if (EGET(ehdr->e_type) != ET_DYN) \
1168 return NULL; \
1169 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1170 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1171 offset = EGET(phdr[i].p_offset); \
1172 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
1173 dyn = DYN ## B (elf->vdata + offset); \
1174 while (EGET(dyn->d_tag) != DT_NULL) { \
1175 if (EGET(dyn->d_tag) == DT_SONAME) { \
1176 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
1177 if (offset >= (Elf ## B ## _Off)elf->len) { \
1178 ++dyn; \
1179 continue; \
1180 } \
1181 soname = elf->data + offset; \
1182 *found_soname = 1; \
1183 return (be_wewy_wewy_quiet ? NULL : soname); \
1184 } \
1185 ++dyn; \
1186 } \
1187 } }
1188 SHOW_SONAME(32)
1189 SHOW_SONAME(64)
1190 }
1191
1192 return NULL;
1193 }
1194
1195 /*
1196 * We support the symbol form:
1197 * [%[modifiers]%][[+-]<symbol name>][,[.....]]
1198 * If the symbol name is empty, then all symbols are matched.
1199 * If the symbol name is a glob ("*"), then all symbols are dumped (debug).
1200 * Do not rely on this output format at all.
1201 * Otherwise the symbol name is used to search (either regex or string compare).
1202 * If the first char of the symbol name is a plus ("+"), then only match
1203 * defined symbols. If it's a minus ("-"), only match undefined symbols.
1204 * Putting modifiers in between the percent signs allows for more in depth
1205 * filters. There are groups of modifiers. If you don't specify a member
1206 * of a group, then all types in that group are matched. The current
1207 * groups and their types are:
1208 * STT group: STT_NOTYPE:n STT_OBJECT:o STT_FUNC:f STT_FILE:F
1209 * STB group: STB_LOCAL:l STB_GLOBAL:g STB_WEAK:w
1210 * STV group: STV_DEFAULT:p STV_INTERNAL:i STV_HIDDEN:h STV_PROTECTED:P
1211 * SHN group: SHN_UNDEF:u SHN_ABS:a SHN_COMMON:c {defined}:d
1212 * The "defined" value in the SHN group does not correspond to a SHN_xxx define.
1213 * You can search for multiple symbols at once by seperating with a comma (",").
1214 *
1215 * Some examples:
1216 * ELFs with a weak function "foo":
1217 * scanelf -s %wf%foo <ELFs>
1218 * ELFs that define the symbol "main":
1219 * scanelf -s +main <ELFs>
1220 * scanelf -s %d%main <ELFs>
1221 * ELFs that refer to the undefined symbol "brk":
1222 * scanelf -s -brk <ELFs>
1223 * scanelf -s %u%brk <ELFs>
1224 * All global defined objects in an ELF:
1225 * scanelf -s %ogd% <ELF>
1226 */
1227 static void
1228 scanelf_match_symname(elfobj *elf, char *found_sym, char **ret, size_t *ret_len, const char *symname,
1229 unsigned int stt, unsigned int stb, unsigned int stv, unsigned int shn, unsigned long size)
1230 {
1231 const char *this_sym;
1232 size_t n;
1233
1234 array_for_each(find_sym_arr, n, this_sym) {
1235 bool inc_notype, inc_object, inc_func, inc_file,
1236 inc_local, inc_global, inc_weak,
1237 inc_visdef, inc_intern, inc_hidden, inc_prot,
1238 inc_def, inc_undef, inc_abs, inc_common;
1239
1240 /* symbol selection! */
1241 inc_notype = inc_object = inc_func = inc_file =
1242 inc_local = inc_global = inc_weak =
1243 inc_visdef = inc_intern = inc_hidden = inc_prot =
1244 inc_def = inc_undef = inc_abs = inc_common =
1245 (*this_sym != '%');
1246
1247 /* parse the contents of %...% */
1248 if (!inc_notype) {
1249 while (*(this_sym++)) {
1250 if (*this_sym == '%') {
1251 ++this_sym;
1252 break;
1253 }
1254 switch (*this_sym) {
1255 case 'n': inc_notype = true; break;
1256 case 'o': inc_object = true; break;
1257 case 'f': inc_func = true; break;
1258 case 'F': inc_file = true; break;
1259 case 'l': inc_local = true; break;
1260 case 'g': inc_global = true; break;
1261 case 'w': inc_weak = true; break;
1262 case 'p': inc_visdef = true; break;
1263 case 'i': inc_intern = true; break;
1264 case 'h': inc_hidden = true; break;
1265 case 'P': inc_prot = true; break;
1266 case 'd': inc_def = true; break;
1267 case 'u': inc_undef = true; break;
1268 case 'a': inc_abs = true; break;
1269 case 'c': inc_common = true; break;
1270 default: err("invalid symbol selector '%c'", *this_sym);
1271 }
1272 }
1273
1274 /* If no types are matched, not match all */
1275 if (!inc_notype && !inc_object && !inc_func && !inc_file)
1276 inc_notype = inc_object = inc_func = inc_file = true;
1277 if (!inc_local && !inc_global && !inc_weak)
1278 inc_local = inc_global = inc_weak = true;
1279 if (!inc_visdef && !inc_intern && !inc_hidden && !inc_prot)
1280 inc_visdef = inc_intern = inc_hidden = inc_prot = true;
1281 if (!inc_def && !inc_undef && !inc_abs && !inc_common)
1282 inc_def = inc_undef = inc_abs = inc_common = true;
1283
1284 /* backwards compat for defined/undefined short hand */
1285 } else if (*this_sym == '+') {
1286 inc_undef = false;
1287 ++this_sym;
1288 } else if (*this_sym == '-') {
1289 inc_def = inc_abs = inc_common = false;
1290 ++this_sym;
1291 }
1292
1293 /* filter symbols */
1294 if ((!inc_notype && stt == STT_NOTYPE ) || \
1295 (!inc_object && stt == STT_OBJECT ) || \
1296 (!inc_func && stt == STT_FUNC ) || \
1297 (!inc_file && stt == STT_FILE ) || \
1298 (!inc_local && stb == STB_LOCAL ) || \
1299 (!inc_global && stb == STB_GLOBAL ) || \
1300 (!inc_weak && stb == STB_WEAK ) || \
1301 (!inc_visdef && stv == STV_DEFAULT ) || \
1302 (!inc_intern && stv == STV_INTERNAL ) || \
1303 (!inc_hidden && stv == STV_HIDDEN ) || \
1304 (!inc_prot && stv == STV_PROTECTED) || \
1305 (!inc_def && shn && shn < SHN_LORESERVE) || \
1306 (!inc_undef && shn == SHN_UNDEF ) || \
1307 (!inc_abs && shn == SHN_ABS ) || \
1308 (!inc_common && shn == SHN_COMMON ))
1309 continue;
1310
1311 if (*this_sym == '*') {
1312 /* a "*" symbol gets you debug output */
1313 printf("%s(%s) %5lX %-15s %-15s %-15s %-15s %s\n",
1314 ((*found_sym == 0) ? "\n\t" : "\t"),
1315 elf->base_filename,
1316 size,
1317 get_elfstttype(stt),
1318 get_elfstbtype(stb),
1319 get_elfstvtype(stv),
1320 get_elfshntype(shn),
1321 symname);
1322 goto matched;
1323
1324 } else {
1325 if (g_match) {
1326 /* regex match the symbol */
1327 if (regexec(find_sym_regex_arr->eles[n], symname, 0, NULL, 0) == REG_NOMATCH)
1328 continue;
1329
1330 } else if (*this_sym) {
1331 /* give empty symbols a "pass", else do a normal compare */
1332 const size_t len = strlen(this_sym);
1333 if (!(strncmp(this_sym, symname, len) == 0 &&
1334 /* Accept unversioned symbol names */
1335 (symname[len] == '\0' || symname[len] == '@')))
1336 continue;
1337 }
1338
1339 if (be_semi_verbose) {
1340 char buf[1024];
1341 snprintf(buf, sizeof(buf), "%lX %s %s",
1342 size,
1343 get_elfstttype(stt),
1344 this_sym);
1345 *ret = xstrdup(buf);
1346 } else {
1347 if (*ret) xchrcat(ret, ',', ret_len);
1348 xstrcat(ret, symname, ret_len);
1349 }
1350
1351 goto matched;
1352 }
1353 }
1354
1355 return;
1356
1357 matched:
1358 *found_sym = 1;
1359 }
1360
1361 static const char *scanelf_file_sym(elfobj *elf, char *found_sym)
1362 {
1363 char *ret;
1364 void *symtab_void, *strtab_void;
1365
1366 if (!find_sym) return NULL;
1367 ret = NULL;
1368
1369 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
1370
1371 if (symtab_void && strtab_void) {
1372 #define FIND_SYM(B) \
1373 if (elf->elf_class == ELFCLASS ## B) { \
1374 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
1375 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
1376 Elf ## B ## _Sym *sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
1377 Elf ## B ## _Word i, cnt = EGET(symtab->sh_entsize); \
1378 char *symname; \
1379 size_t ret_len = 0; \
1380 if (cnt) \
1381 cnt = EGET(symtab->sh_size) / cnt; \
1382 for (i = 0; i < cnt; ++i) { \
1383 if ((void*)sym > elf->data_end) { \
1384 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1385 goto break_out; \
1386 } \
1387 if (sym->st_name) { \
1388 /* make sure the symbol name is in acceptable memory range */ \
1389 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
1390 if ((void*)symname > elf->data_end) { \
1391 warnf("%s: corrupt ELF symbols", elf->filename); \
1392 ++sym; \
1393 continue; \
1394 } \
1395 scanelf_match_symname(elf, found_sym, \
1396 &ret, &ret_len, symname, \
1397 ELF##B##_ST_TYPE(EGET(sym->st_info)), \
1398 ELF##B##_ST_BIND(EGET(sym->st_info)), \
1399 ELF##B##_ST_VISIBILITY(EGET(sym->st_other)), \
1400 EGET(sym->st_shndx), \
1401 /* st_size can be 64bit, but no one is really that big, so screw em */ \
1402 EGET(sym->st_size)); \
1403 } \
1404 ++sym; \
1405 } \
1406 }
1407 FIND_SYM(32)
1408 FIND_SYM(64)
1409 }
1410
1411 break_out:
1412 if (be_wewy_wewy_quiet) return NULL;
1413
1414 if (*find_sym != '*' && *found_sym)
1415 return ret;
1416 if (be_quiet)
1417 return NULL;
1418 else
1419 return " - ";
1420 }
1421
1422 static const char *scanelf_file_sections(elfobj *elf, char *found_section)
1423 {
1424 if (!find_section)
1425 return NULL;
1426
1427 #define FIND_SECTION(B) \
1428 if (elf->elf_class == ELFCLASS ## B) { \
1429 size_t matched, n; \
1430 int invert; \
1431 const char *section_name; \
1432 Elf ## B ## _Shdr *section; \
1433 \
1434 matched = 0; \
1435 array_for_each(find_section_arr, n, section_name) { \
1436 invert = (*section_name == '!' ? 1 : 0); \
1437 section = SHDR ## B (elf_findsecbyname(elf, section_name + invert)); \
1438 if ((section == NULL && invert) || (section != NULL && !invert)) \
1439 ++matched; \
1440 } \
1441 \
1442 if (matched == array_cnt(find_section_arr)) \
1443 *found_section = 1; \
1444 }
1445 FIND_SECTION(32)
1446 FIND_SECTION(64)
1447
1448 if (be_wewy_wewy_quiet)
1449 return NULL;
1450
1451 if (*found_section)
1452 return find_section;
1453
1454 if (be_quiet)
1455 return NULL;
1456 else
1457 return " - ";
1458 }
1459
1460 /* scan an elf file and show all the fun stuff */
1461 #define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
1462 static int scanelf_elfobj(elfobj *elf)
1463 {
1464 unsigned long i;
1465 char found_pax, found_phdr, found_relro, found_load, found_textrel,
1466 found_rpath, found_needed, found_interp, found_bind, found_soname,
1467 found_sym, found_lib, found_file, found_textrels, found_section;
1468 static char *out_buffer = NULL;
1469 static size_t out_len;
1470
1471 found_pax = found_phdr = found_relro = found_load = found_textrel = \
1472 found_rpath = found_needed = found_interp = found_bind = found_soname = \
1473 found_sym = found_lib = found_file = found_textrels = found_section = 0;
1474
1475 if (be_verbose > 2)
1476 printf("%s: scanning file {%s,%s}\n", elf->filename,
1477 get_elfeitype(EI_CLASS, elf->elf_class),
1478 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
1479 else if (be_verbose > 1)
1480 printf("%s: scanning file\n", elf->filename);
1481
1482 /* init output buffer */
1483 if (!out_buffer) {
1484 out_len = sizeof(char) * 80;
1485 out_buffer = xmalloc(out_len);
1486 }
1487 *out_buffer = '\0';
1488
1489 /* show the header */
1490 if (!be_quiet && show_banner) {
1491 for (i = 0; out_format[i]; ++i) {
1492 if (!IS_MODIFIER(out_format[i])) continue;
1493
1494 switch (out_format[++i]) {
1495 case '+': break;
1496 case '%': break;
1497 case '#': break;
1498 case 'F':
1499 case 'p':
1500 case 'f': prints("FILE "); found_file = 1; break;
1501 case 'o': prints(" TYPE "); break;
1502 case 'x': prints(" PAX "); break;
1503 case 'e': prints("STK/REL/PTL "); break;
1504 case 't': prints("TEXTREL "); break;
1505 case 'r': prints("RPATH "); break;
1506 case 'M': prints("CLASS "); break;
1507 case 'l':
1508 case 'n': prints("NEEDED "); break;
1509 case 'i': prints("INTERP "); break;
1510 case 'b': prints("BIND "); break;
1511 case 'Z': prints("SIZE "); break;
1512 case 'S': prints("SONAME "); break;
1513 case 's': prints("SYM "); break;
1514 case 'N': prints("LIB "); break;
1515 case 'T': prints("TEXTRELS "); break;
1516 case 'k': prints("SECTION "); break;
1517 case 'a': prints("ARCH "); break;
1518 case 'I': prints("OSABI "); break;
1519 case 'Y': prints("EABI "); break;
1520 case 'O': prints("PERM "); break;
1521 case 'D': prints("ENDIAN "); break;
1522 default: warnf("'%c' has no title ?", out_format[i]);
1523 }
1524 }
1525 if (!found_file) prints("FILE ");
1526 prints("\n");
1527 found_file = 0;
1528 show_banner = 0;
1529 }
1530
1531 /* dump all the good stuff */
1532 for (i = 0; out_format[i]; ++i) {
1533 const char *out;
1534 const char *tmp;
1535 static char ubuf[sizeof(unsigned long)*2];
1536 if (!IS_MODIFIER(out_format[i])) {
1537 xchrcat(&out_buffer, out_format[i], &out_len);
1538 continue;
1539 }
1540
1541 out = NULL;
1542 be_wewy_wewy_quiet = (out_format[i] == '#');
1543 be_semi_verbose = (out_format[i] == '+');
1544 switch (out_format[++i]) {
1545 case '+':
1546 case '%':
1547 case '#':
1548 xchrcat(&out_buffer, out_format[i], &out_len); break;
1549 case 'F':
1550 found_file = 1;
1551 if (be_wewy_wewy_quiet) break;
1552 xstrcat(&out_buffer, elf->filename, &out_len);
1553 break;
1554 case 'p':
1555 found_file = 1;
1556 if (be_wewy_wewy_quiet) break;
1557 tmp = elf->filename;
1558 if (search_path) {
1559 ssize_t len_search = strlen(search_path);
1560 ssize_t len_file = strlen(elf->filename);
1561 if (!strncmp(elf->filename, search_path, len_search) && \
1562 len_file > len_search)
1563 tmp += len_search;
1564 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1565 }
1566 xstrcat(&out_buffer, tmp, &out_len);
1567 break;
1568 case 'f':
1569 found_file = 1;
1570 if (be_wewy_wewy_quiet) break;
1571 tmp = strrchr(elf->filename, '/');
1572 tmp = (tmp == NULL ? elf->filename : tmp+1);
1573 xstrcat(&out_buffer, tmp, &out_len);
1574 break;
1575 case 'o': out = get_elfetype(elf); break;
1576 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
1577 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
1578 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1579 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
1580 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1581 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1582 case 'D': out = get_endian(elf); break;
1583 case 'O': out = strfileperms(elf->filename); break;
1584 case 'n':
1585 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
1586 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1587 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1588 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
1589 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1590 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1591 case 'a': out = get_elfemtype(elf); break;
1592 case 'I': out = get_elfosabi(elf); break;
1593 case 'Y': out = get_elf_eabi(elf); break;
1594 case 'Z': snprintf(ubuf, sizeof(ubuf), "%lu", (unsigned long)elf->len); out = ubuf; break;;
1595 default: warnf("'%c' has no scan code?", out_format[i]);
1596 }
1597 if (out)
1598 xstrcat(&out_buffer, out, &out_len);
1599 }
1600
1601 #define FOUND_SOMETHING() \
1602 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1603 found_rpath || found_needed || found_interp || found_bind || \
1604 found_soname || found_sym || found_lib || found_textrels || found_section )
1605
1606 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1607 xchrcat(&out_buffer, ' ', &out_len);
1608 xstrcat(&out_buffer, elf->filename, &out_len);
1609 }
1610 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
1611 puts(out_buffer);
1612 fflush(stdout);
1613 }
1614
1615 return 0;
1616 }
1617
1618 /* scan a single elf */
1619 static int scanelf_elf(const char *filename, int fd, size_t len)
1620 {
1621 int ret = 1;
1622 size_t n;
1623 const char *match_etype;
1624 elfobj *elf;
1625
1626 /* Verify this is a real ELF */
1627 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1628 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1629 return 2;
1630 }
1631
1632 /* Possibly filter based on ELF bitness */
1633 switch (match_bits) {
1634 case 32:
1635 if (elf->elf_class != ELFCLASS32)
1636 goto done;
1637 break;
1638 case 64:
1639 if (elf->elf_class != ELFCLASS64)
1640 goto done;
1641 break;
1642 }
1643
1644 /* Possibly filter based on the ELF's e_type field */
1645 array_for_each(match_etypes, n, match_etype)
1646 if (etype_lookup(match_etype) == get_etype(elf))
1647 goto scanit;
1648 if (array_cnt(match_etypes))
1649 goto done;
1650
1651 scanit:
1652 ret = scanelf_elfobj(elf);
1653
1654 done:
1655 unreadelf(elf);
1656 return ret;
1657 }
1658
1659 /* scan an archive of elfs */
1660 static int scanelf_archive(const char *filename, int fd, size_t len)
1661 {
1662 archive_handle *ar;
1663 archive_member *m;
1664 char *ar_buffer;
1665 elfobj *elf;
1666
1667 ar = ar_open_fd(filename, fd);
1668 if (ar == NULL)
1669 return 1;
1670
1671 ar_buffer = mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1672 while ((m = ar_next(ar)) != NULL) {
1673 off_t cur_pos = lseek(fd, 0, SEEK_CUR);
1674 if (cur_pos == -1)
1675 errp("lseek() failed");
1676 elf = readelf_buffer(m->name, ar_buffer + cur_pos, m->size);
1677 if (elf) {
1678 scanelf_elfobj(elf);
1679 unreadelf(elf);
1680 }
1681 }
1682 munmap(ar_buffer, len);
1683
1684 return 0;
1685 }
1686 /* scan a file which may be an elf or an archive or some other magical beast */
1687 static int scanelf_fileat(int dir_fd, const char *filename, const struct stat *st_cache)
1688 {
1689 const struct stat *st = st_cache;
1690 struct stat symlink_st;
1691 int fd;
1692
1693 /* always handle regular files and handle symlinked files if no -y */
1694 if (S_ISLNK(st->st_mode)) {
1695 if (!scan_symlink)
1696 return 1;
1697 fstatat(dir_fd, filename, &symlink_st, 0);
1698 st = &symlink_st;
1699 }
1700
1701 if (!S_ISREG(st->st_mode)) {
1702 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1703 return 1;
1704 }
1705
1706 if (match_perms) {
1707 if ((st->st_mode | match_perms) != st->st_mode)
1708 return 1;
1709 }
1710 fd = openat(dir_fd, filename, (fix_elf ? O_RDWR : O_RDONLY) | O_CLOEXEC);
1711 if (fd == -1) {
1712 if (fix_elf && errno == ETXTBSY)
1713 warnp("%s: could not fix", filename);
1714 else if (be_verbose > 2)
1715 printf("%s: skipping file: %s\n", filename, strerror(errno));
1716 return 1;
1717 }
1718
1719 if (scanelf_elf(filename, fd, st->st_size) == 2) {
1720 /* if it isn't an ELF, maybe it's an .a archive */
1721 if (scan_archives)
1722 scanelf_archive(filename, fd, st->st_size);
1723
1724 /*
1725 * unreadelf() implicitly closes its fd, so only close it
1726 * when we are returning it in the non-ELF case
1727 */
1728 close(fd);
1729 }
1730
1731 return 0;
1732 }
1733
1734 /* scan a directory for ET_EXEC files and print when we find one */
1735 static int scanelf_dirat(int dir_fd, const char *path)
1736 {
1737 register DIR *dir;
1738 register struct dirent *dentry;
1739 struct stat st_top, st;
1740 char buf[__PAX_UTILS_PATH_MAX], *subpath;
1741 size_t pathlen = 0, len = 0;
1742 int ret = 0;
1743 int subdir_fd;
1744
1745 /* make sure path exists */
1746 if (fstatat(dir_fd, path, &st_top, AT_SYMLINK_NOFOLLOW) == -1) {
1747 if (be_verbose > 2) printf("%s: does not exist\n", path);
1748 return 1;
1749 }
1750
1751 /* ok, if it isn't a directory, assume we can open it */
1752 if (!S_ISDIR(st_top.st_mode))
1753 return scanelf_fileat(dir_fd, path, &st_top);
1754
1755 /* now scan the dir looking for fun stuff */
1756 subdir_fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
1757 if (subdir_fd == -1)
1758 dir = NULL;
1759 else
1760 dir = fdopendir(subdir_fd);
1761 if (dir == NULL) {
1762 if (subdir_fd != -1)
1763 close(subdir_fd);
1764 else if (be_verbose > 2)
1765 printf("%s: skipping dir: %s\n", path, strerror(errno));
1766 return 1;
1767 }
1768 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1769
1770 subpath = stpcpy(buf, path);
1771 if (subpath[-1] != '/')
1772 *subpath++ = '/';
1773 pathlen = subpath - buf;
1774 while ((dentry = readdir(dir))) {
1775 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1776 continue;
1777
1778 if (fstatat(subdir_fd, dentry->d_name, &st, AT_SYMLINK_NOFOLLOW) == -1)
1779 continue;
1780
1781 len = strlen(dentry->d_name);
1782 if (len + pathlen + 1 >= sizeof(buf)) {
1783 warnf("Skipping '%s%s': len > sizeof(buf); %zu > %zu\n",
1784 path, dentry->d_name, len + pathlen + 1, sizeof(buf));
1785 continue;
1786 }
1787 memcpy(subpath, dentry->d_name, len);
1788 subpath[len] = '\0';
1789
1790 if (S_ISREG(st.st_mode))
1791 ret = scanelf_fileat(dir_fd, buf, &st);
1792 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1793 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1794 ret = scanelf_dirat(dir_fd, buf);
1795 }
1796 }
1797 closedir(dir);
1798
1799 return ret;
1800 }
1801 static int scanelf_dir(const char *path)
1802 {
1803 return scanelf_dirat(root_fd, root_rel_path(path));
1804 }
1805
1806 static int scanelf_from_file(const char *filename)
1807 {
1808 FILE *fp;
1809 char *p, *path;
1810 size_t len;
1811 int ret;
1812
1813 if (strcmp(filename, "-") == 0)
1814 fp = stdin;
1815 else if ((fp = fopen(filename, "r")) == NULL)
1816 return 1;
1817
1818 path = NULL;
1819 len = 0;
1820 ret = 0;
1821 while (getline(&path, &len, fp) != -1) {
1822 if ((p = strchr(path, '\n')) != NULL)
1823 *p = 0;
1824 search_path = path;
1825 ret = scanelf_dir(path);
1826 }
1827 free(path);
1828
1829 if (fp != stdin)
1830 fclose(fp);
1831
1832 return ret;
1833 }
1834
1835 #if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1836
1837 static int _load_ld_cache_config(const char *fname)
1838 {
1839 FILE *fp = NULL;
1840 char *p, *path;
1841 size_t len;
1842 int curr_fd = -1;
1843
1844 fp = fopenat_r(root_fd, root_rel_path(fname));
1845 if (fp == NULL)
1846 return -1;
1847
1848 path = NULL;
1849 len = 0;
1850 while (getline(&path, &len, fp) != -1) {
1851 if ((p = strrchr(path, '\r')) != NULL)
1852 *p = 0;
1853 if ((p = strchr(path, '\n')) != NULL)
1854 *p = 0;
1855
1856 /* recursive includes of the same file will make this segfault. */
1857 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1858 glob_t gl;
1859 size_t x;
1860 const char *gpath;
1861
1862 /* re-use existing path buffer ... need to be creative */
1863 if (path[8] != '/')
1864 gpath = memcpy(path + 3, "/etc/", 5);
1865 else
1866 gpath = path + 8;
1867 if (root_fd != AT_FDCWD) {
1868 if (curr_fd == -1) {
1869 curr_fd = open(".", O_RDONLY|O_CLOEXEC);
1870 if (fchdir(root_fd))
1871 errp("unable to change to root dir");
1872 }
1873 gpath = root_rel_path(gpath);
1874 }
1875
1876 if (glob(gpath, 0, NULL, &gl) == 0) {
1877 for (x = 0; x < gl.gl_pathc; ++x) {
1878 /* try to avoid direct loops */
1879 if (strcmp(gl.gl_pathv[x], fname) == 0)
1880 continue;
1881 _load_ld_cache_config(gl.gl_pathv[x]);
1882 }
1883 globfree(&gl);
1884 }
1885
1886 /* failed globs are ignored by glibc */
1887 continue;
1888 }
1889
1890 if (*path != '/')
1891 continue;
1892
1893 xarraypush_str(ldpaths, path);
1894 }
1895 free(path);
1896
1897 fclose(fp);
1898
1899 if (curr_fd != -1) {
1900 if (fchdir(curr_fd))
1901 {/* don't care */}
1902 close(curr_fd);
1903 }
1904
1905 return 0;
1906 }
1907
1908 #elif defined(__FreeBSD__) || defined(__DragonFly__)
1909
1910 static int _load_ld_cache_config(const char *fname)
1911 {
1912 FILE *fp = NULL;
1913 char *b = NULL, *p;
1914 struct elfhints_hdr hdr;
1915
1916 fp = fopenat_r(root_fd, root_rel_path(fname));
1917 if (fp == NULL)
1918 return -1;
1919
1920 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1921 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1922 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1923 {
1924 fclose(fp);
1925 return -1;
1926 }
1927
1928 b = xmalloc(hdr.dirlistlen + 1);
1929 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1930 fclose(fp);
1931 free(b);
1932 return -1;
1933 }
1934
1935 while ((p = strsep(&b, ":"))) {
1936 if (*p == '\0')
1937 continue;
1938 xarraypush_str(ldpaths, p);
1939 }
1940
1941 free(b);
1942 fclose(fp);
1943 return 0;
1944 }
1945
1946 #else
1947 #ifdef __ELF__
1948 #warning Cache config support not implemented for your target
1949 #endif
1950 static int _load_ld_cache_config(const char *fname)
1951 {
1952 return 0;
1953 }
1954 #endif
1955
1956 static void load_ld_cache_config(const char *fname)
1957 {
1958 bool scan_l, scan_ul, scan_ull;
1959 size_t n;
1960 const char *ldpath;
1961
1962 _load_ld_cache_config(fname);
1963
1964 scan_l = scan_ul = scan_ull = false;
1965 array_for_each(ldpaths, n, ldpath) {
1966 if (!scan_l && !strcmp(ldpath, "/lib")) scan_l = true;
1967 if (!scan_ul && !strcmp(ldpath, "/usr/lib")) scan_ul = true;
1968 if (!scan_ull && !strcmp(ldpath, "/usr/local/lib")) scan_ull = true;
1969 }
1970
1971 if (!scan_l) xarraypush_str(ldpaths, "/lib");
1972 if (!scan_ul) xarraypush_str(ldpaths, "/usr/lib");
1973 if (!scan_ull) xarraypush_str(ldpaths, "/usr/local/lib");
1974 }
1975
1976 /* scan /etc/ld.so.conf for paths */
1977 static void scanelf_ldpath(void)
1978 {
1979 size_t n;
1980 const char *ldpath;
1981
1982 array_for_each(ldpaths, n, ldpath)
1983 scanelf_dir(ldpath);
1984 }
1985
1986 /* scan env PATH for paths */
1987 static void scanelf_envpath(void)
1988 {
1989 char *path, *p;
1990
1991 path = getenv("PATH");
1992 if (!path)
1993 err("PATH is not set in your env !");
1994 path = xstrdup(path);
1995
1996 while ((p = strrchr(path, ':')) != NULL) {
1997 scanelf_dir(p + 1);
1998 *p = 0;
1999 }
2000
2001 free(path);
2002 }
2003
2004 /* usage / invocation handling functions */ /* Free Flags: c d j u w G H J K P Q U W */
2005 #define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZCBhV"
2006 #define a_argument required_argument
2007 static struct option const long_opts[] = {
2008 {"path", no_argument, NULL, 'p'},
2009 {"ldpath", no_argument, NULL, 'l'},
2010 {"use-ldpath",no_argument, NULL, 129},
2011 {"root", a_argument, NULL, 128},
2012 {"recursive", no_argument, NULL, 'R'},
2013 {"mount", no_argument, NULL, 'm'},
2014 {"symlink", no_argument, NULL, 'y'},
2015 {"archives", no_argument, NULL, 'A'},
2016 {"ldcache", no_argument, NULL, 'L'},
2017 {"fix", no_argument, NULL, 'X'},
2018 {"setpax", a_argument, NULL, 'z'},
2019 {"pax", no_argument, NULL, 'x'},
2020 {"header", no_argument, NULL, 'e'},
2021 {"textrel", no_argument, NULL, 't'},
2022 {"rpath", no_argument, NULL, 'r'},
2023 {"needed", no_argument, NULL, 'n'},
2024 {"interp", no_argument, NULL, 'i'},
2025 {"bind", no_argument, NULL, 'b'},
2026 {"soname", no_argument, NULL, 'S'},
2027 {"symbol", a_argument, NULL, 's'},
2028 {"section", a_argument, NULL, 'k'},
2029 {"lib", a_argument, NULL, 'N'},
2030 {"gmatch", no_argument, NULL, 'g'},
2031 {"textrels", no_argument, NULL, 'T'},
2032 {"etype", a_argument, NULL, 'E'},
2033 {"bits", a_argument, NULL, 'M'},
2034 {"endian", no_argument, NULL, 'D'},
2035 {"osabi", no_argument, NULL, 'I'},
2036 {"eabi", no_argument, NULL, 'Y'},
2037 {"perms", a_argument, NULL, 'O'},
2038 {"size", no_argument, NULL, 'Z'},
2039 {"all", no_argument, NULL, 'a'},
2040 {"quiet", no_argument, NULL, 'q'},
2041 {"verbose", no_argument, NULL, 'v'},
2042 {"format", a_argument, NULL, 'F'},
2043 {"from", a_argument, NULL, 'f'},
2044 {"file", a_argument, NULL, 'o'},
2045 {"nocolor", no_argument, NULL, 'C'},
2046 {"nobanner", no_argument, NULL, 'B'},
2047 {"help", no_argument, NULL, 'h'},
2048 {"version", no_argument, NULL, 'V'},
2049 {NULL, no_argument, NULL, 0x0}
2050 };
2051
2052 static const char * const opts_help[] = {
2053 "Scan all directories in PATH environment",
2054 "Scan all directories in /etc/ld.so.conf",
2055 "Use ld.so.conf to show full path (use with -r/-n)",
2056 "Root directory (use with -l or -p)",
2057 "Scan directories recursively",
2058 "Don't recursively cross mount points",
2059 "Don't scan symlinks",
2060 "Scan archives (.a files)",
2061 "Utilize ld.so.cache to show full path (use with -r/-n)",
2062 "Try and 'fix' bad things (use with -r/-e)",
2063 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
2064 "Print PaX markings",
2065 "Print GNU_STACK/PT_LOAD markings",
2066 "Print TEXTREL information",
2067 "Print RPATH information",
2068 "Print NEEDED information",
2069 "Print INTERP information",
2070 "Print BIND information",
2071 "Print SONAME information",
2072 "Find a specified symbol",
2073 "Find a specified section",
2074 "Find a specified library",
2075 "Use regex rather than string compare (with -s); specify twice for case insensitive",
2076 "Locate cause of TEXTREL",
2077 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
2078 "Print only ELF files matching numeric bits",
2079 "Print Endianness",
2080 "Print OSABI",
2081 "Print EABI (EM_ARM Only)",
2082 "Print only ELF files matching octal permissions",
2083 "Print ELF file size",
2084 "Print all useful/simple info\n",
2085 "Only output 'bad' things",
2086 "Be verbose (can be specified more than once)",
2087 "Use specified format for output",
2088 "Read input stream from a filename",
2089 "Write output stream to a filename",
2090 "Don't emit color in output",
2091 "Don't display the header",
2092 "Print this help and exit",
2093 "Print version and exit",
2094 NULL
2095 };
2096
2097 /* display usage and exit */
2098 static void usage(int status)
2099 {
2100 const char a_arg[] = "<arg>";
2101 size_t a_arg_len = strlen(a_arg) + 2;
2102 size_t i;
2103 int optlen;
2104 printf("* Scan ELF binaries for stuff\n\n"
2105 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
2106 printf("Options: -[%s]\n", PARSE_FLAGS);
2107
2108 /* prescan the --long opt length to auto-align */
2109 optlen = 0;
2110 for (i = 0; long_opts[i].name; ++i) {
2111 int l = strlen(long_opts[i].name);
2112 if (long_opts[i].has_arg == a_argument)
2113 l += a_arg_len;
2114 optlen = max(l, optlen);
2115 }
2116
2117 for (i = 0; long_opts[i].name; ++i) {
2118 /* first output the short flag if it has one */
2119 if (long_opts[i].val > '~')
2120 printf(" ");
2121 else
2122 printf(" -%c, ", long_opts[i].val);
2123
2124 /* then the long flag */
2125 if (long_opts[i].has_arg == no_argument)
2126 printf("--%-*s", optlen, long_opts[i].name);
2127 else
2128 printf("--%s %s %*s", long_opts[i].name, a_arg,
2129 (int)(optlen - strlen(long_opts[i].name) - a_arg_len), "");
2130
2131 /* finally the help text */
2132 printf("* %s\n", opts_help[i]);
2133 }
2134
2135 puts("\nFor more information, see the scanelf(1) manpage");
2136 exit(status);
2137 }
2138
2139 /* parse command line arguments and preform needed actions */
2140 #define do_pax_state(option, flag) \
2141 if (islower(option)) { \
2142 flags &= ~PF_##flag; \
2143 flags |= PF_NO##flag; \
2144 } else { \
2145 flags &= ~PF_NO##flag; \
2146 flags |= PF_##flag; \
2147 }
2148 static void parse_delimited(array_t *arr, char *arg, const char *delim)
2149 {
2150 char *ele = strtok(arg, delim);
2151 if (!ele) /* edge case: -s '' */
2152 xarraypush_str(arr, "");
2153 while (ele) {
2154 xarraypush_str(arr, ele);
2155 ele = strtok(NULL, delim);
2156 }
2157 }
2158 static int parseargs(int argc, char *argv[])
2159 {
2160 int i;
2161 const char *from_file = NULL;
2162 int ret = 0;
2163 char load_cache_config = 0;
2164
2165 opterr = 0;
2166 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
2167 switch (i) {
2168
2169 case 'V':
2170 printf("pax-utils-%s: %s compiled %s\n%s\n"
2171 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
2172 VERSION, __FILE__, __DATE__, rcsid, argv0);
2173 exit(EXIT_SUCCESS);
2174 break;
2175 case 'h': usage(EXIT_SUCCESS); break;
2176 case 'f':
2177 if (from_file) warn("You prob don't want to specify -f twice");
2178 from_file = optarg;
2179 break;
2180 case 'E':
2181 /* historically, this was comma delimited */
2182 parse_delimited(match_etypes, optarg, ",");
2183 break;
2184 case 'M':
2185 match_bits = atoi(optarg);
2186 if (match_bits == 0) {
2187 if (strcmp(optarg, "ELFCLASS32") == 0)
2188 match_bits = 32;
2189 if (strcmp(optarg, "ELFCLASS64") == 0)
2190 match_bits = 64;
2191 }
2192 break;
2193 case 'O':
2194 if (sscanf(optarg, "%o", &match_perms) == -1)
2195 match_bits = 0;
2196 break;
2197 case 'o': {
2198 if (freopen(optarg, "w", stdout) == NULL)
2199 errp("Could not freopen(%s)", optarg);
2200 break;
2201 }
2202 case 'k':
2203 xarraypush_str(find_section_arr, optarg);
2204 break;
2205 case 's':
2206 /* historically, this was comma delimited */
2207 parse_delimited(find_sym_arr, optarg, ",");
2208 break;
2209 case 'N':
2210 xarraypush_str(find_lib_arr, optarg);
2211 break;
2212 case 'F': {
2213 if (out_format) warn("You prob don't want to specify -F twice");
2214 out_format = optarg;
2215 break;
2216 }
2217 case 'z': {
2218 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
2219 size_t x;
2220
2221 for (x = 0; x < strlen(optarg); x++) {
2222 switch (optarg[x]) {
2223 case 'p':
2224 case 'P':
2225 do_pax_state(optarg[x], PAGEEXEC);
2226 break;
2227 case 's':
2228 case 'S':
2229 do_pax_state(optarg[x], SEGMEXEC);
2230 break;
2231 case 'm':
2232 case 'M':
2233 do_pax_state(optarg[x], MPROTECT);
2234 break;
2235 case 'e':
2236 case 'E':
2237 do_pax_state(optarg[x], EMUTRAMP);
2238 break;
2239 case 'r':
2240 case 'R':
2241 do_pax_state(optarg[x], RANDMMAP);
2242 break;
2243 case 'x':
2244 case 'X':
2245 do_pax_state(optarg[x], RANDEXEC);
2246 break;
2247 default:
2248 break;
2249 }
2250 }
2251 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
2252 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
2253 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
2254 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
2255 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
2256 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
2257 setpax = flags;
2258 break;
2259 }
2260 case 'Z': show_size = 1; break;
2261 case 'g': ++g_match; break;
2262 case 'L': load_cache_config = use_ldcache = 1; break;
2263 case 'y': scan_symlink = 0; break;
2264 case 'A': scan_archives = 1; break;
2265 case 'C': color_init(true); break;
2266 case 'B': show_banner = 0; break;
2267 case 'l': load_cache_config = scan_ldpath = 1; break;
2268 case 'p': scan_envpath = 1; break;
2269 case 'R': dir_recurse = 1; break;
2270 case 'm': dir_crossmount = 0; break;
2271 case 'X': ++fix_elf; break;
2272 case 'x': show_pax = 1; break;
2273 case 'e': show_phdr = 1; break;
2274 case 't': show_textrel = 1; break;
2275 case 'r': show_rpath = 1; break;
2276 case 'n': show_needed = 1; break;
2277 case 'i': show_interp = 1; break;
2278 case 'b': show_bind = 1; break;
2279 case 'S': show_soname = 1; break;
2280 case 'T': show_textrels = 1; break;
2281 case 'q': be_quiet = min(be_quiet, 20) + 1; break;
2282 case 'v': be_verbose = min(be_verbose, 20) + 1; break;
2283 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
2284 case 'D': show_endian = 1; break;
2285 case 'I': show_osabi = 1; break;
2286 case 'Y': show_eabi = 1; break;
2287 case 128:
2288 root_fd = open(optarg, O_RDONLY|O_CLOEXEC);
2289 if (root_fd == -1)
2290 err("Could not open root: %s", optarg);
2291 break;
2292 case 129: load_cache_config = use_ldpath = 1; break;
2293 case ':':
2294 err("Option '%c' is missing parameter", optopt);
2295 case '?':
2296 err("Unknown option '%c' or argument missing", optopt);
2297 default:
2298 err("Unhandled option '%c'; please report this", i);
2299 }
2300 }
2301 if (show_textrels && be_verbose)
2302 objdump = which("objdump", "OBJDUMP");
2303 /* precompile all the regexes */
2304 if (g_match) {
2305 regex_t preg;
2306 const char *this_sym;
2307 size_t n;
2308 int flags = REG_EXTENDED | REG_NOSUB | (g_match > 1 ? REG_ICASE : 0);
2309
2310 array_for_each(find_sym_arr, n, this_sym) {
2311 /* see scanelf_match_symname for logic info */
2312 switch (this_sym[0]) {
2313 case '%':
2314 while (*(this_sym++))
2315 if (*this_sym == '%') {
2316 ++this_sym;
2317 break;
2318 }
2319 break;
2320 case '+':
2321 case '-':
2322 ++this_sym;
2323 break;
2324 }
2325 if (*this_sym == '*')
2326 ++this_sym;
2327
2328 ret = regcomp(&preg, this_sym, flags);
2329 if (ret) {
2330 char err[256];
2331 regerror(ret, &preg, err, sizeof(err));
2332 err("regcomp of %s failed: %s", this_sym, err);
2333 }
2334 xarraypush(find_sym_regex_arr, &preg, sizeof(preg));
2335 }
2336 }
2337 /* flatten arrays for display */
2338 find_sym = array_flatten_str(find_sym_arr);
2339 find_lib = array_flatten_str(find_lib_arr);
2340 find_section = array_flatten_str(find_section_arr);
2341 /* let the format option override all other options */
2342 if (out_format) {
2343 show_pax = show_phdr = show_textrel = show_rpath = \
2344 show_needed = show_interp = show_bind = show_soname = \
2345 show_textrels = show_perms = show_endian = show_size = \
2346 show_osabi = show_eabi = 0;
2347 for (i = 0; out_format[i]; ++i) {
2348 if (!IS_MODIFIER(out_format[i])) continue;
2349
2350 switch (out_format[++i]) {
2351 case '+': break;
2352 case '%': break;
2353 case '#': break;
2354 case 'F': break;
2355 case 'p': break;
2356 case 'f': break;
2357 case 'k': break;
2358 case 's': break;
2359 case 'N': break;
2360 case 'o': break;
2361 case 'a': break;
2362 case 'M': break;
2363 case 'Z': show_size = 1; break;
2364 case 'D': show_endian = 1; break;
2365 case 'I': show_osabi = 1; break;
2366 case 'Y': show_eabi = 1; break;
2367 case 'O': show_perms = 1; break;
2368 case 'x': show_pax = 1; break;
2369 case 'e': show_phdr = 1; break;
2370 case 't': show_textrel = 1; break;
2371 case 'r': show_rpath = 1; break;
2372 case 'n': show_needed = 1; break;
2373 case 'i': show_interp = 1; break;
2374 case 'b': show_bind = 1; break;
2375 case 'S': show_soname = 1; break;
2376 case 'T': show_textrels = 1; break;
2377 default:
2378 err("invalid format specifier '%c' (byte %i)",
2379 out_format[i], i+1);
2380 }
2381 }
2382
2383 /* construct our default format */
2384 } else {
2385 size_t fmt_len = 30;
2386 out_format = xmalloc(sizeof(char) * fmt_len);
2387 *out_format = '\0';
2388 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
2389 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
2390 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
2391 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
2392 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
2393 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
2394 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
2395 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
2396 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
2397 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
2398 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
2399 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
2400 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
2401 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
2402 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
2403 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
2404 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
2405 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
2406 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
2407 }
2408 if (be_verbose > 2) printf("Format: %s\n", out_format);
2409
2410 /* now lets actually do the scanning */
2411 if (load_cache_config)
2412 load_ld_cache_config(__PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
2413 if (scan_ldpath) scanelf_ldpath();
2414 if (scan_envpath) scanelf_envpath();
2415 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
2416 from_file = "-";
2417 if (from_file) {
2418 scanelf_from_file(from_file);
2419 from_file = *argv;
2420 }
2421 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
2422 err("Nothing to scan !?");
2423 while (optind < argc) {
2424 search_path = argv[optind++];
2425 ret = scanelf_dir(search_path);
2426 }
2427
2428 #ifdef __PAX_UTILS_CLEANUP
2429 /* clean up */
2430 xarrayfree(ldpaths);
2431 xarrayfree(find_sym_arr);
2432 xarrayfree(find_lib_arr);
2433 xarrayfree(find_section_arr);
2434 free(find_sym);
2435 free(find_lib);
2436 free(find_section);
2437 {
2438 size_t n;
2439 regex_t *preg;
2440 array_for_each(find_sym_regex_arr, n, preg)
2441 regfree(preg);
2442 xarrayfree(find_sym_regex_arr);
2443 }
2444
2445 if (ldcache != 0)
2446 munmap(ldcache, ldcache_size);
2447 #endif
2448
2449 return ret;
2450 }
2451
2452 static char **get_split_env(const char *envvar)
2453 {
2454 const char *delims = " \t\n";
2455 char **envvals = NULL;
2456 char *env, *s;
2457 int nentry;
2458
2459 if ((env = getenv(envvar)) == NULL)
2460 return NULL;
2461
2462 env = xstrdup(env);
2463 if (env == NULL)
2464 return NULL;
2465
2466 s = strtok(env, delims);
2467 if (s == NULL) {
2468 free(env);
2469 return NULL;
2470 }
2471
2472 nentry = 0;
2473 while (s != NULL) {
2474 ++nentry;
2475 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
2476 envvals[nentry-1] = s;
2477 s = strtok(NULL, delims);
2478 }
2479 envvals[nentry] = NULL;
2480
2481 /* don't want to free(env) as it contains the memory that backs
2482 * the envvals array of strings */
2483 return envvals;
2484 }
2485
2486 static void parseenv(void)
2487 {
2488 color_init(false);
2489 qa_textrels = get_split_env("QA_TEXTRELS");
2490 qa_execstack = get_split_env("QA_EXECSTACK");
2491 qa_wx_load = get_split_env("QA_WX_LOAD");
2492 }
2493
2494 #ifdef __PAX_UTILS_CLEANUP
2495 static void cleanup(void)
2496 {
2497 free(out_format);
2498 free(qa_textrels);
2499 free(qa_execstack);
2500 free(qa_wx_load);
2501 }
2502 #endif
2503
2504 int main(int argc, char *argv[])
2505 {
2506 int ret;
2507 if (argc < 2)
2508 usage(EXIT_FAILURE);
2509 parseenv();
2510 ret = parseargs(argc, argv);
2511 fclose(stdout);
2512 #ifdef __PAX_UTILS_CLEANUP
2513 cleanup();
2514 warn("The calls to add/delete heap should be off:\n"
2515 "\t- 1 due to the out_buffer not being freed in scanelf_fileat()\n"
2516 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
2517 #endif
2518 return ret;
2519 }
2520
2521 /* Match filename against entries in matchlist, return TRUE
2522 * if the file is listed */
2523 static int file_matches_list(const char *filename, char **matchlist)
2524 {
2525 char **file;
2526 char *match;
2527 char buf[__PAX_UTILS_PATH_MAX];
2528
2529 if (matchlist == NULL)
2530 return 0;
2531
2532 for (file = matchlist; *file != NULL; file++) {
2533 if (search_path) {
2534 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2535 match = buf;
2536 } else {
2537 match = *file;
2538 }
2539 if (fnmatch(match, filename, 0) == 0)
2540 return 1;
2541 }
2542 return 0;
2543 }

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