/[gentoo-projects]/pax-utils/scanelf.c
Gentoo

Contents of /pax-utils/scanelf.c

Parent Directory Parent Directory | Revision Log Revision Log


Revision 1.256 - (show annotations) (download) (as text)
Mon Apr 8 06:38:42 2013 UTC (19 months, 3 weeks ago) by vapier
Branch: MAIN
Changes since 1.255: +19 -5 lines
File MIME type: text/x-csrc
scanelf: auto-align help output

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 1.255 2013/04/02 21:15:50 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 1.255 2013/04/02 21:15:50 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 char *match_etypes = NULL;
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 int has_objdump = 0;
74
75 /* find the path to a file by name */
76 static int bin_in_path(const char *fname)
77 {
78 char fullpath[__PAX_UTILS_PATH_MAX];
79 char *path, *p;
80
81 path = getenv("PATH");
82 if (!path)
83 return 0;
84
85 while ((p = strrchr(path, ':')) != NULL) {
86 snprintf(fullpath, sizeof(fullpath), "%s/%s", p + 1, fname);
87 *p = 0;
88 if (access(fullpath, R_OK) != -1)
89 return 1;
90 }
91
92 return 0;
93 }
94
95 static FILE *fopenat_r(int dir_fd, const char *path)
96 {
97 int fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
98 if (fd == -1)
99 return NULL;
100 return fdopen(fd, "re");
101 }
102
103 static const char *root_rel_path(const char *path)
104 {
105 /*
106 * openat() will ignore the dirfd if path starts with
107 * a /, so consume all of that noise
108 *
109 * XXX: we don't handle relative paths like ../ that
110 * break out of the --root option, but for now, just
111 * don't do that :P.
112 */
113 if (root_fd != AT_FDCWD) {
114 while (*path == '/')
115 ++path;
116 if (*path == '\0')
117 path = ".";
118 }
119
120 return path;
121 }
122
123 /* sub-funcs for scanelf_fileat() */
124 static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **str)
125 {
126 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
127
128 /* debug sections */
129 void *symtab = elf_findsecbyname(elf, ".symtab");
130 void *strtab = elf_findsecbyname(elf, ".strtab");
131 /* runtime sections */
132 void *dynsym = elf_findsecbyname(elf, ".dynsym");
133 void *dynstr = elf_findsecbyname(elf, ".dynstr");
134
135 /*
136 * If the sections are marked NOBITS, then they don't exist, so we just
137 * skip them. This let's us work sanely with splitdebug ELFs (rather
138 * than spewing a lot of "corrupt ELF" messages later on). In malformed
139 * ELFs, the section might be wrongly set to NOBITS, but screw em.
140 */
141 #define GET_SYMTABS(B) \
142 if (elf->elf_class == ELFCLASS ## B) { \
143 Elf ## B ## _Shdr *esymtab = symtab; \
144 Elf ## B ## _Shdr *estrtab = strtab; \
145 Elf ## B ## _Shdr *edynsym = dynsym; \
146 Elf ## B ## _Shdr *edynstr = dynstr; \
147 \
148 if (symtab && EGET(esymtab->sh_type) == SHT_NOBITS) \
149 symtab = NULL; \
150 if (dynsym && EGET(edynsym->sh_type) == SHT_NOBITS) \
151 dynsym = NULL; \
152 if (symtab && dynsym) \
153 *sym = (EGET(esymtab->sh_size) > EGET(edynsym->sh_size)) ? symtab : dynsym; \
154 else \
155 *sym = symtab ? symtab : dynsym; \
156 \
157 if (strtab && EGET(estrtab->sh_type) == SHT_NOBITS) \
158 strtab = NULL; \
159 if (dynstr && EGET(edynstr->sh_type) == SHT_NOBITS) \
160 dynstr = NULL; \
161 if (strtab && dynstr) \
162 *str = (EGET(estrtab->sh_size) > EGET(edynstr->sh_size)) ? strtab : dynstr; \
163 else \
164 *str = strtab ? strtab : dynstr; \
165 }
166 GET_SYMTABS(32)
167 GET_SYMTABS(64)
168
169 if (*sym && *str)
170 return;
171
172 /*
173 * damn, they're really going to make us work for it huh?
174 * reconstruct the section header info out of the dynamic
175 * tags so we can see what symbols this guy uses at runtime.
176 */
177 #define GET_SYMTABS_DT(B) \
178 if (elf->elf_class == ELFCLASS ## B) { \
179 size_t i; \
180 static Elf ## B ## _Shdr sym_shdr, str_shdr; \
181 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
182 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
183 Elf ## B ## _Addr vsym, vstr, vhash, vgnu_hash; \
184 Elf ## B ## _Dyn *dyn; \
185 Elf ## B ## _Off offset; \
186 \
187 /* lookup symbols used at runtime with DT_SYMTAB / DT_STRTAB */ \
188 vsym = vstr = vhash = vgnu_hash = 0; \
189 memset(&sym_shdr, 0, sizeof(sym_shdr)); \
190 memset(&str_shdr, 0, sizeof(str_shdr)); \
191 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
192 if (EGET(phdr[i].p_type) != PT_DYNAMIC) \
193 continue; \
194 \
195 offset = EGET(phdr[i].p_offset); \
196 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
197 continue; \
198 \
199 dyn = DYN ## B (elf->vdata + offset); \
200 while (EGET(dyn->d_tag) != DT_NULL) { \
201 switch (EGET(dyn->d_tag)) { \
202 case DT_SYMTAB: vsym = EGET(dyn->d_un.d_val); break; \
203 case DT_SYMENT: sym_shdr.sh_entsize = dyn->d_un.d_val; break; \
204 case DT_STRTAB: vstr = EGET(dyn->d_un.d_val); break; \
205 case DT_STRSZ: str_shdr.sh_size = dyn->d_un.d_val; break; \
206 case DT_HASH: vhash = EGET(dyn->d_un.d_val); break; \
207 /*case DT_GNU_HASH: vgnu_hash = EGET(dyn->d_un.d_val); break;*/ \
208 } \
209 ++dyn; \
210 } \
211 if (vsym && vstr) \
212 break; \
213 } \
214 if (!vsym || !vstr || !(vhash || vgnu_hash)) \
215 return; \
216 \
217 /* calc offset into the ELF by finding the load addr of the syms */ \
218 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
219 Elf ## B ## _Addr vaddr = EGET(phdr[i].p_vaddr); \
220 Elf ## B ## _Addr filesz = EGET(phdr[i].p_filesz); \
221 offset = EGET(phdr[i].p_offset); \
222 \
223 if (EGET(phdr[i].p_type) != PT_LOAD) \
224 continue; \
225 \
226 if (vhash >= vaddr && vhash < vaddr + filesz) { \
227 /* Scan the hash table to see how many entries we have */ \
228 Elf32_Word max_sym_idx = 0; \
229 Elf32_Word *hashtbl = elf->vdata + offset + (vhash - vaddr); \
230 Elf32_Word b, nbuckets = EGET(hashtbl[0]); \
231 Elf32_Word nchains = EGET(hashtbl[1]); \
232 Elf32_Word *buckets = &hashtbl[2]; \
233 Elf32_Word *chains = &buckets[nbuckets]; \
234 Elf32_Word sym_idx; \
235 \
236 for (b = 0; b < nbuckets; ++b) { \
237 if (!buckets[b]) \
238 continue; \
239 for (sym_idx = buckets[b]; sym_idx < nchains && sym_idx; sym_idx = chains[sym_idx]) \
240 if (max_sym_idx < sym_idx) \
241 max_sym_idx = sym_idx; \
242 } \
243 ESET(sym_shdr.sh_size, sym_shdr.sh_entsize * max_sym_idx); \
244 } \
245 \
246 if (vsym >= vaddr && vsym < vaddr + filesz) { \
247 ESET(sym_shdr.sh_offset, offset + (vsym - vaddr)); \
248 *sym = &sym_shdr; \
249 } \
250 \
251 if (vstr >= vaddr && vstr < vaddr + filesz) { \
252 ESET(str_shdr.sh_offset, offset + (vstr - vaddr)); \
253 *str = &str_shdr; \
254 } \
255 } \
256 }
257 GET_SYMTABS_DT(32)
258 GET_SYMTABS_DT(64)
259 }
260
261 static char *scanelf_file_pax(elfobj *elf, char *found_pax)
262 {
263 static char ret[7];
264 unsigned long i, shown;
265
266 if (!show_pax) return NULL;
267
268 shown = 0;
269 memset(&ret, 0, sizeof(ret));
270
271 if (elf->phdr) {
272 #define SHOW_PAX(B) \
273 if (elf->elf_class == ELFCLASS ## B) { \
274 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
275 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
276 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
277 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
278 continue; \
279 if (fix_elf && setpax) { \
280 /* set the paxctl flags */ \
281 ESET(phdr[i].p_flags, setpax); \
282 } \
283 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
284 continue; \
285 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
286 *found_pax = 1; \
287 ++shown; \
288 break; \
289 } \
290 }
291 SHOW_PAX(32)
292 SHOW_PAX(64)
293 }
294
295 /* Note: We do not support setting EI_PAX if not PT_PAX_FLAGS
296 * was found. This is known to break ELFs on glibc systems,
297 * and mainline PaX has deprecated use of this for a long time.
298 * We could support changing PT_GNU_STACK, but that doesn't
299 * seem like it's worth the effort. #411919
300 */
301
302 /* fall back to EI_PAX if no PT_PAX was found */
303 if (!*ret) {
304 static char *paxflags;
305 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
306 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
307 *found_pax = 1;
308 return (be_wewy_wewy_quiet ? NULL : paxflags);
309 }
310 strncpy(ret, paxflags, sizeof(ret));
311 }
312
313 if (be_wewy_wewy_quiet || (be_quiet && !shown))
314 return NULL;
315 else
316 return ret;
317 }
318
319 static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
320 {
321 static char ret[12];
322 char *found;
323 unsigned long i, shown, multi_stack, multi_relro, multi_load;
324
325 if (!show_phdr) return NULL;
326
327 memcpy(ret, "--- --- ---\0", 12);
328
329 shown = 0;
330 multi_stack = multi_relro = multi_load = 0;
331
332 #define NOTE_GNU_STACK ".note.GNU-stack"
333 #define SHOW_PHDR(B) \
334 if (elf->elf_class == ELFCLASS ## B) { \
335 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
336 Elf ## B ## _Off offset; \
337 uint32_t flags, check_flags; \
338 if (elf->phdr != NULL) { \
339 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
340 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
341 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
342 if (multi_stack++) \
343 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
344 if (file_matches_list(elf->filename, qa_execstack)) \
345 continue; \
346 found = found_phdr; \
347 offset = 0; \
348 check_flags = PF_X; \
349 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
350 if (multi_relro++) \
351 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
352 found = found_relro; \
353 offset = 4; \
354 check_flags = PF_X; \
355 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
356 if (file_matches_list(elf->filename, qa_wx_load)) \
357 continue; \
358 found = found_load; \
359 offset = 8; \
360 check_flags = PF_W|PF_X; \
361 } else \
362 continue; \
363 flags = EGET(phdr[i].p_flags); \
364 if (be_quiet && ((flags & check_flags) != check_flags)) \
365 continue; \
366 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
367 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
368 ret[3] = ret[7] = '!'; \
369 flags = EGET(phdr[i].p_flags); \
370 } \
371 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
372 *found = 1; \
373 ++shown; \
374 } \
375 } else if (elf->shdr != NULL) { \
376 /* no program headers which means this is prob an object file */ \
377 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
378 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
379 char *str; \
380 if ((void*)strtbl > elf->data_end) \
381 goto skip_this_shdr##B; \
382 check_flags = SHF_WRITE|SHF_EXECINSTR; \
383 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
384 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
385 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
386 str = elf->data + offset; \
387 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
388 if (!strcmp(str, NOTE_GNU_STACK)) { \
389 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
390 flags = EGET(shdr[i].sh_flags); \
391 if (be_quiet && ((flags & check_flags) != check_flags)) \
392 continue; \
393 ++*found_phdr; \
394 shown = 1; \
395 if (flags & SHF_WRITE) ret[0] = 'W'; \
396 if (flags & SHF_ALLOC) ret[1] = 'A'; \
397 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
398 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
399 break; \
400 } \
401 } \
402 skip_this_shdr##B: \
403 if (!multi_stack) { \
404 if (file_matches_list(elf->filename, qa_execstack)) \
405 return NULL; \
406 *found_phdr = 1; \
407 shown = 1; \
408 memcpy(ret, "!WX", 3); \
409 } \
410 } \
411 }
412 SHOW_PHDR(32)
413 SHOW_PHDR(64)
414
415 if (be_wewy_wewy_quiet || (be_quiet && !shown))
416 return NULL;
417 else
418 return ret;
419 }
420
421 /*
422 * See if this ELF contains a DT_TEXTREL tag in any of its
423 * PT_DYNAMIC sections.
424 */
425 static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
426 {
427 static const char *ret = "TEXTREL";
428 unsigned long i;
429
430 if (!show_textrel && !show_textrels) return NULL;
431
432 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
433
434 if (elf->phdr) {
435 #define SHOW_TEXTREL(B) \
436 if (elf->elf_class == ELFCLASS ## B) { \
437 Elf ## B ## _Dyn *dyn; \
438 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
439 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
440 Elf ## B ## _Off offset; \
441 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
442 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
443 offset = EGET(phdr[i].p_offset); \
444 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
445 dyn = DYN ## B (elf->vdata + offset); \
446 while (EGET(dyn->d_tag) != DT_NULL) { \
447 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
448 *found_textrel = 1; \
449 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
450 return (be_wewy_wewy_quiet ? NULL : ret); \
451 } \
452 ++dyn; \
453 } \
454 } }
455 SHOW_TEXTREL(32)
456 SHOW_TEXTREL(64)
457 }
458
459 if (be_quiet || be_wewy_wewy_quiet)
460 return NULL;
461 else
462 return " - ";
463 }
464
465 /*
466 * Scan the .text section to see if there are any relocations in it.
467 * Should rewrite this to check PT_LOAD sections that are marked
468 * Executable rather than the section named '.text'.
469 */
470 static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
471 {
472 unsigned long s, r, rmax;
473 void *symtab_void, *strtab_void, *text_void;
474
475 if (!show_textrels) return NULL;
476
477 /* don't search for TEXTREL's if the ELF doesn't have any */
478 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
479 if (!*found_textrel) return NULL;
480
481 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
482 text_void = elf_findsecbyname(elf, ".text");
483
484 if (symtab_void && strtab_void && text_void && elf->shdr) {
485 #define SHOW_TEXTRELS(B) \
486 if (elf->elf_class == ELFCLASS ## B) { \
487 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
488 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
489 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
490 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
491 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
492 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
493 uint ## B ## _t memsz = EGET(text->sh_size); \
494 Elf ## B ## _Rel *rel; \
495 Elf ## B ## _Rela *rela; \
496 /* search the section headers for relocations */ \
497 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
498 uint32_t sh_type = EGET(shdr[s].sh_type); \
499 if (sh_type == SHT_REL) { \
500 rel = REL ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
501 rela = NULL; \
502 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
503 } else if (sh_type == SHT_RELA) { \
504 rel = NULL; \
505 rela = RELA ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
506 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
507 } else \
508 continue; \
509 /* now see if any of the relocs are in the .text */ \
510 for (r = 0; r < rmax; ++r) { \
511 unsigned long sym_max; \
512 Elf ## B ## _Addr offset_tmp; \
513 Elf ## B ## _Sym *func; \
514 Elf ## B ## _Sym *sym; \
515 Elf ## B ## _Addr r_offset; \
516 uint ## B ## _t r_info; \
517 if (sh_type == SHT_REL) { \
518 r_offset = EGET(rel[r].r_offset); \
519 r_info = EGET(rel[r].r_info); \
520 } else { \
521 r_offset = EGET(rela[r].r_offset); \
522 r_info = EGET(rela[r].r_info); \
523 } \
524 /* make sure this relocation is inside of the .text */ \
525 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
526 if (be_verbose <= 2) continue; \
527 } else \
528 *found_textrels = 1; \
529 /* locate this relocation symbol name */ \
530 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
531 if ((void*)sym > elf->data_end) { \
532 warn("%s: corrupt ELF symbol", elf->filename); \
533 continue; \
534 } \
535 sym_max = ELF ## B ## _R_SYM(r_info); \
536 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
537 sym += sym_max; \
538 else \
539 sym = NULL; \
540 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
541 /* show the raw details about this reloc */ \
542 printf(" %s: ", elf->base_filename); \
543 if (sym && sym->st_name) \
544 printf("%s", elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
545 else \
546 printf("(memory/data?)"); \
547 printf(" [0x%lX]", (unsigned long)r_offset); \
548 /* now try to find the closest symbol that this rel is probably in */ \
549 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
550 func = NULL; \
551 offset_tmp = 0; \
552 while (sym_max--) { \
553 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
554 func = sym; \
555 offset_tmp = EGET(sym->st_value); \
556 } \
557 ++sym; \
558 } \
559 printf(" in "); \
560 if (func && func->st_name) { \
561 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
562 if (r_offset > EGET(func->st_size)) \
563 printf("(optimized out: previous %s)", func_name); \
564 else \
565 printf("%s", func_name); \
566 } else \
567 printf("(optimized out)"); \
568 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
569 if (be_verbose && has_objdump) { \
570 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
571 char *sysbuf; \
572 size_t syslen; \
573 const char sysfmt[] = "objdump -r -R -d -w -l --start-address=0x%lX --stop-address=0x%lX %s | grep --color -i -C 3 '.*[[:space:]]%lX:[[:space:]]*R_.*'\n"; \
574 syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
575 sysbuf = xmalloc(syslen); \
576 if (end_addr < r_offset) \
577 /* not uncommon when things are optimized out */ \
578 end_addr = r_offset + 0x100; \
579 snprintf(sysbuf, syslen, sysfmt, \
580 (unsigned long)offset_tmp, \
581 (unsigned long)end_addr, \
582 elf->filename, \
583 (unsigned long)r_offset); \
584 fflush(stdout); \
585 if (system(sysbuf)) /* don't care */; \
586 fflush(stdout); \
587 free(sysbuf); \
588 } \
589 } \
590 } }
591 SHOW_TEXTRELS(32)
592 SHOW_TEXTRELS(64)
593 }
594 if (!*found_textrels)
595 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
596
597 return NULL;
598 }
599
600 static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
601 {
602 struct stat st;
603 switch (*item) {
604 case '/': break;
605 case '.':
606 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
607 break;
608 case ':':
609 case '\0':
610 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
611 break;
612 case '$':
613 if (fstat(elf->fd, &st) != -1)
614 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
615 warnf("Security problem with %s='%s' in %s with mode set of %o",
616 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
617 break;
618 default:
619 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
620 break;
621 }
622 }
623 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
624 {
625 unsigned long i;
626 char *rpath, *runpath, **r;
627 void *strtbl_void;
628
629 if (!show_rpath) return;
630
631 strtbl_void = elf_findsecbyname(elf, ".dynstr");
632 rpath = runpath = NULL;
633
634 if (elf->phdr && strtbl_void) {
635 #define SHOW_RPATH(B) \
636 if (elf->elf_class == ELFCLASS ## B) { \
637 Elf ## B ## _Dyn *dyn; \
638 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
639 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
640 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
641 Elf ## B ## _Off offset; \
642 Elf ## B ## _Xword word; \
643 /* Scan all the program headers */ \
644 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
645 /* Just scan dynamic headers */ \
646 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
647 offset = EGET(phdr[i].p_offset); \
648 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
649 /* Just scan dynamic RPATH/RUNPATH headers */ \
650 dyn = DYN ## B (elf->vdata + offset); \
651 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
652 if (word == DT_RPATH) { \
653 r = &rpath; \
654 } else if (word == DT_RUNPATH) { \
655 r = &runpath; \
656 } else { \
657 ++dyn; \
658 continue; \
659 } \
660 /* Verify the memory is somewhat sane */ \
661 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
662 if (offset < (Elf ## B ## _Off)elf->len) { \
663 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
664 *r = elf->data + offset; \
665 /* cache the length in case we need to nuke this section later on */ \
666 if (fix_elf) \
667 offset = strlen(*r); \
668 /* If quiet, don't output paths in ld.so.conf */ \
669 if (be_quiet) { \
670 size_t len; \
671 char *start, *end; \
672 /* note that we only 'chop' off leading known paths. */ \
673 /* since *r is read-only memory, we can only move the ptr forward. */ \
674 start = *r; \
675 /* scan each path in : delimited list */ \
676 while (start) { \
677 rpath_security_checks(elf, start, get_elfdtype(word)); \
678 end = strchr(start, ':'); \
679 len = (end ? abs(end - start) : strlen(start)); \
680 if (use_ldcache) { \
681 size_t n; \
682 const char *ldpath; \
683 array_for_each(ldpaths, n, ldpath) \
684 if (!strncmp(ldpath, start, len) && !ldpath[len]) { \
685 *r = end; \
686 /* corner case ... if RPATH reads "/usr/lib:", we want \
687 * to show ':' rather than '' */ \
688 if (end && end[1] != '\0') \
689 (*r)++; \
690 break; \
691 } \
692 } \
693 if (!*r || !end) \
694 break; \
695 else \
696 start = start + len + 1; \
697 } \
698 } \
699 if (*r) { \
700 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
701 /* just nuke it */ \
702 nuke_it##B: \
703 memset(*r, 0x00, offset); \
704 *r = NULL; \
705 ESET(dyn->d_tag, DT_DEBUG); \
706 ESET(dyn->d_un.d_ptr, 0); \
707 } else if (fix_elf) { \
708 /* try to clean "bad" paths */ \
709 size_t len, tmpdir_len; \
710 char *start, *end; \
711 const char *tmpdir; \
712 start = *r; \
713 tmpdir = (getenv("TMPDIR") ? : "."); \
714 tmpdir_len = strlen(tmpdir); \
715 while (1) { \
716 end = strchr(start, ':'); \
717 if (start == end) { \
718 eat_this_path##B: \
719 len = strlen(end); \
720 memmove(start, end+1, len); \
721 start[len-1] = '\0'; \
722 end = start - 1; \
723 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
724 if (!end) { \
725 if (start == *r) \
726 goto nuke_it##B; \
727 *--start = '\0'; \
728 } else \
729 goto eat_this_path##B; \
730 } \
731 if (!end) \
732 break; \
733 start = end + 1; \
734 } \
735 if (**r == '\0') \
736 goto nuke_it##B; \
737 } \
738 if (*r) \
739 *found_rpath = 1; \
740 } \
741 } \
742 ++dyn; \
743 } \
744 } }
745 SHOW_RPATH(32)
746 SHOW_RPATH(64)
747 }
748
749 if (be_wewy_wewy_quiet) return;
750
751 if (rpath && runpath) {
752 if (!strcmp(rpath, runpath)) {
753 xstrcat(ret, runpath, ret_len);
754 } else {
755 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
756 xchrcat(ret, '{', ret_len);
757 xstrcat(ret, rpath, ret_len);
758 xchrcat(ret, ',', ret_len);
759 xstrcat(ret, runpath, ret_len);
760 xchrcat(ret, '}', ret_len);
761 }
762 } else if (rpath || runpath)
763 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
764 else if (!be_quiet)
765 xstrcat(ret, " - ", ret_len);
766 }
767
768 /* Defines can be seen in glibc's sysdeps/generic/ldconfig.h */
769 #define LDSO_CACHE_MAGIC "ld.so-"
770 #define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
771 #define LDSO_CACHE_VER "1.7.0"
772 #define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
773 #define FLAG_ANY -1
774 #define FLAG_TYPE_MASK 0x00ff
775 #define FLAG_LIBC4 0x0000
776 #define FLAG_ELF 0x0001
777 #define FLAG_ELF_LIBC5 0x0002
778 #define FLAG_ELF_LIBC6 0x0003
779 #define FLAG_REQUIRED_MASK 0xff00
780 #define FLAG_SPARC_LIB64 0x0100
781 #define FLAG_IA64_LIB64 0x0200
782 #define FLAG_X8664_LIB64 0x0300
783 #define FLAG_S390_LIB64 0x0400
784 #define FLAG_POWERPC_LIB64 0x0500
785 #define FLAG_MIPS64_LIBN32 0x0600
786 #define FLAG_MIPS64_LIBN64 0x0700
787 #define FLAG_X8664_LIBX32 0x0800
788 #define FLAG_ARM_LIBHF 0x0900
789 #define FLAG_AARCH64_LIB64 0x0a00
790
791 #if defined(__GLIBC__) || defined(__UCLIBC__)
792
793 static char *lookup_cache_lib(elfobj *elf, const char *fname)
794 {
795 int fd;
796 char *strs;
797 static char buf[__PAX_UTILS_PATH_MAX] = "";
798 const char *cachefile = root_rel_path("/etc/ld.so.cache");
799 struct stat st;
800
801 typedef struct {
802 char magic[LDSO_CACHE_MAGIC_LEN];
803 char version[LDSO_CACHE_VER_LEN];
804 int nlibs;
805 } header_t;
806 header_t *header;
807
808 typedef struct {
809 int flags;
810 int sooffset;
811 int liboffset;
812 } libentry_t;
813 libentry_t *libent;
814
815 if (fname == NULL)
816 return NULL;
817
818 if (ldcache == NULL) {
819 if (fstatat(root_fd, cachefile, &st, 0))
820 return NULL;
821
822 fd = openat(root_fd, cachefile, O_RDONLY);
823 if (fd == -1)
824 return NULL;
825
826 /* cache these values so we only map/unmap the cache file once */
827 ldcache_size = st.st_size;
828 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
829 close(fd);
830
831 if (ldcache == MAP_FAILED) {
832 ldcache = NULL;
833 return NULL;
834 }
835
836 if (memcmp(header->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN) ||
837 memcmp(header->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
838 {
839 munmap(ldcache, ldcache_size);
840 ldcache = NULL;
841 return NULL;
842 }
843 } else
844 header = ldcache;
845
846 libent = ldcache + sizeof(header_t);
847 strs = (char *) &libent[header->nlibs];
848
849 for (fd = 0; fd < header->nlibs; ++fd) {
850 /* This should be more fine grained, but for now we assume that
851 * diff arches will not be cached together, and we ignore the
852 * the different multilib mips cases.
853 */
854 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
855 continue;
856 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
857 continue;
858
859 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
860 continue;
861
862 /* Return first hit because that is how the ldso rolls */
863 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
864 break;
865 }
866
867 return buf;
868 }
869
870 #elif defined(__NetBSD__)
871 static char *lookup_cache_lib(elfobj *elf, const char *fname)
872 {
873 static char buf[__PAX_UTILS_PATH_MAX] = "";
874 static struct stat st;
875 size_t n;
876 char *ldpath;
877
878 array_for_each(ldpath, n, ldpath) {
879 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", ldpath, fname) >= sizeof(buf))
880 continue; /* if the pathname is too long, or something went wrong, ignore */
881
882 if (stat(buf, &st) != 0)
883 continue; /* if the lib doesn't exist in *ldpath, look further */
884
885 /* NetBSD doesn't actually do sanity checks, it just loads the file
886 * and if that doesn't work, continues looking in other directories.
887 * This cannot easily be safely emulated, unfortunately. For now,
888 * just assume that if it exists, it's a valid library. */
889
890 return buf;
891 }
892
893 /* not found in any path */
894 return NULL;
895 }
896 #else
897 #ifdef __ELF__
898 #warning Cache support not implemented for your target
899 #endif
900 static char *lookup_cache_lib(elfobj *elf, const char *fname)
901 {
902 return NULL;
903 }
904 #endif
905
906 static char *lookup_config_lib(elfobj *elf, char *fname)
907 {
908 static char buf[__PAX_UTILS_PATH_MAX] = "";
909 const char *ldpath;
910 size_t n;
911
912 array_for_each(ldpaths, n, ldpath) {
913 snprintf(buf, sizeof(buf), "%s/%s", root_rel_path(ldpath), fname);
914 if (faccessat(root_fd, buf, F_OK, AT_SYMLINK_NOFOLLOW) == 0)
915 return buf;
916 }
917
918 return NULL;
919 }
920
921 static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
922 {
923 unsigned long i;
924 char *needed;
925 void *strtbl_void;
926 char *p;
927
928 /*
929 * -n -> op==0 -> print all
930 * -N -> op==1 -> print requested
931 */
932 if ((op == 0 && !show_needed) || (op == 1 && !find_lib))
933 return NULL;
934
935 strtbl_void = elf_findsecbyname(elf, ".dynstr");
936
937 if (elf->phdr && strtbl_void) {
938 #define SHOW_NEEDED(B) \
939 if (elf->elf_class == ELFCLASS ## B) { \
940 Elf ## B ## _Dyn *dyn; \
941 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
942 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
943 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
944 Elf ## B ## _Off offset; \
945 size_t matched = 0; \
946 /* Walk all the program headers to find the PT_DYNAMIC */ \
947 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
948 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) \
949 continue; \
950 offset = EGET(phdr[i].p_offset); \
951 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
952 continue; \
953 /* Walk all the dynamic tags to find NEEDED entries */ \
954 dyn = DYN ## B (elf->vdata + offset); \
955 while (EGET(dyn->d_tag) != DT_NULL) { \
956 if (EGET(dyn->d_tag) == DT_NEEDED) { \
957 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
958 if (offset >= (Elf ## B ## _Off)elf->len) { \
959 ++dyn; \
960 continue; \
961 } \
962 needed = elf->data + offset; \
963 if (op == 0) { \
964 /* -n -> print all entries */ \
965 if (!be_wewy_wewy_quiet) { \
966 if (*found_needed) xchrcat(ret, ',', ret_len); \
967 if (use_ldpath) { \
968 if ((p = lookup_config_lib(elf, needed)) != NULL) \
969 needed = p; \
970 } else if (use_ldcache) { \
971 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
972 needed = p; \
973 } \
974 xstrcat(ret, needed, ret_len); \
975 } \
976 *found_needed = 1; \
977 } else { \
978 /* -N -> print matching entries */ \
979 size_t n; \
980 const char *find_lib_name; \
981 \
982 array_for_each(find_lib_arr, n, find_lib_name) { \
983 int invert = 1; \
984 if (find_lib_name[0] == '!') \
985 invert = 0, ++find_lib_name; \
986 if (!strcmp(find_lib_name, needed) == invert) \
987 ++matched; \
988 } \
989 \
990 if (matched == array_cnt(find_lib_arr)) { \
991 *found_lib = 1; \
992 return (be_wewy_wewy_quiet ? NULL : find_lib); \
993 } \
994 } \
995 } \
996 ++dyn; \
997 } \
998 } }
999 SHOW_NEEDED(32)
1000 SHOW_NEEDED(64)
1001 if (op == 0 && !*found_needed && be_verbose)
1002 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
1003 }
1004
1005 return NULL;
1006 }
1007 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
1008 {
1009 void *strtbl_void;
1010
1011 if (!show_interp) return NULL;
1012
1013 strtbl_void = elf_findsecbyname(elf, ".interp");
1014
1015 if (strtbl_void) {
1016 #define SHOW_INTERP(B) \
1017 if (elf->elf_class == ELFCLASS ## B) { \
1018 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
1019 *found_interp = 1; \
1020 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
1021 }
1022 SHOW_INTERP(32)
1023 SHOW_INTERP(64)
1024 } else {
1025 /* Walk all the program headers to find the PT_INTERP */
1026 #define SHOW_PT_INTERP(B) \
1027 if (elf->elf_class == ELFCLASS ## B) { \
1028 unsigned long i; \
1029 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1030 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1031 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1032 if (EGET(phdr[i].p_type) != PT_INTERP) \
1033 continue; \
1034 *found_interp = 1; \
1035 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(phdr[i].p_offset)); \
1036 } \
1037 }
1038 SHOW_PT_INTERP(32)
1039 SHOW_PT_INTERP(64)
1040 }
1041
1042 return NULL;
1043 }
1044 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
1045 {
1046 unsigned long i;
1047 struct stat s;
1048 char dynamic = 0;
1049
1050 if (!show_bind) return NULL;
1051 if (!elf->phdr) return NULL;
1052
1053 #define SHOW_BIND(B) \
1054 if (elf->elf_class == ELFCLASS ## B) { \
1055 Elf ## B ## _Dyn *dyn; \
1056 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1057 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1058 Elf ## B ## _Off offset; \
1059 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1060 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1061 dynamic = 1; \
1062 offset = EGET(phdr[i].p_offset); \
1063 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
1064 dyn = DYN ## B (elf->vdata + offset); \
1065 while (EGET(dyn->d_tag) != DT_NULL) { \
1066 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
1067 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
1068 { \
1069 if (be_quiet) return NULL; \
1070 *found_bind = 1; \
1071 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
1072 } \
1073 ++dyn; \
1074 } \
1075 } \
1076 }
1077 SHOW_BIND(32)
1078 SHOW_BIND(64)
1079
1080 if (be_wewy_wewy_quiet) return NULL;
1081
1082 /* don't output anything if quiet mode and the ELF is static or not setuid */
1083 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
1084 return NULL;
1085 } else {
1086 *found_bind = 1;
1087 return (char *)(dynamic ? "LAZY" : "STATIC");
1088 }
1089 }
1090 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
1091 {
1092 unsigned long i;
1093 char *soname;
1094 void *strtbl_void;
1095
1096 if (!show_soname) return NULL;
1097
1098 strtbl_void = elf_findsecbyname(elf, ".dynstr");
1099
1100 if (elf->phdr && strtbl_void) {
1101 #define SHOW_SONAME(B) \
1102 if (elf->elf_class == ELFCLASS ## B) { \
1103 Elf ## B ## _Dyn *dyn; \
1104 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1105 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1106 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
1107 Elf ## B ## _Off offset; \
1108 /* only look for soname in shared objects */ \
1109 if (EGET(ehdr->e_type) != ET_DYN) \
1110 return NULL; \
1111 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1112 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1113 offset = EGET(phdr[i].p_offset); \
1114 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
1115 dyn = DYN ## B (elf->vdata + offset); \
1116 while (EGET(dyn->d_tag) != DT_NULL) { \
1117 if (EGET(dyn->d_tag) == DT_SONAME) { \
1118 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
1119 if (offset >= (Elf ## B ## _Off)elf->len) { \
1120 ++dyn; \
1121 continue; \
1122 } \
1123 soname = elf->data + offset; \
1124 *found_soname = 1; \
1125 return (be_wewy_wewy_quiet ? NULL : soname); \
1126 } \
1127 ++dyn; \
1128 } \
1129 } }
1130 SHOW_SONAME(32)
1131 SHOW_SONAME(64)
1132 }
1133
1134 return NULL;
1135 }
1136
1137 /*
1138 * We support the symbol form:
1139 * [%[modifiers]%][[+-]<symbol name>][,[.....]]
1140 * If the symbol name is empty, then all symbols are matched.
1141 * If the symbol name is a glob ("*"), then all symbols are dumped (debug).
1142 * Do not rely on this output format at all.
1143 * Otherwise the symbol name is used to search (either regex or string compare).
1144 * If the first char of the symbol name is a plus ("+"), then only match
1145 * defined symbols. If it's a minus ("-"), only match undefined symbols.
1146 * Putting modifiers in between the percent signs allows for more in depth
1147 * filters. There are groups of modifiers. If you don't specify a member
1148 * of a group, then all types in that group are matched. The current
1149 * groups and their types are:
1150 * STT group: STT_NOTYPE:n STT_OBJECT:o STT_FUNC:f STT_FILE:F
1151 * STB group: STB_LOCAL:l STB_GLOBAL:g STB_WEAK:w
1152 * SHN group: SHN_UNDEF:u SHN_ABS:a SHN_COMMON:c {defined}:d
1153 * The "defined" value in the SHN group does not correspond to a SHN_xxx define.
1154 * You can search for multiple symbols at once by seperating with a comma (",").
1155 *
1156 * Some examples:
1157 * ELFs with a weak function "foo":
1158 * scanelf -s %wf%foo <ELFs>
1159 * ELFs that define the symbol "main":
1160 * scanelf -s +main <ELFs>
1161 * scanelf -s %d%main <ELFs>
1162 * ELFs that refer to the undefined symbol "brk":
1163 * scanelf -s -brk <ELFs>
1164 * scanelf -s %u%brk <ELFs>
1165 * All global defined objects in an ELF:
1166 * scanelf -s %ogd% <ELF>
1167 */
1168 static void
1169 scanelf_match_symname(elfobj *elf, char *found_sym, char **ret, size_t *ret_len, const char *symname,
1170 unsigned int stt, unsigned int stb, unsigned int shn, unsigned long size)
1171 {
1172 const char *this_sym;
1173 size_t n;
1174
1175 array_for_each(find_sym_arr, n, this_sym) {
1176 bool inc_notype, inc_object, inc_func, inc_file,
1177 inc_local, inc_global, inc_weak,
1178 inc_def, inc_undef, inc_abs, inc_common;
1179
1180 /* symbol selection! */
1181 inc_notype = inc_object = inc_func = inc_file = \
1182 inc_local = inc_global = inc_weak = \
1183 inc_def = inc_undef = inc_abs = inc_common = \
1184 (*this_sym != '%');
1185
1186 /* parse the contents of %...% */
1187 if (!inc_notype) {
1188 while (*(this_sym++)) {
1189 if (*this_sym == '%') {
1190 ++this_sym;
1191 break;
1192 }
1193 switch (*this_sym) {
1194 case 'n': inc_notype = true; break;
1195 case 'o': inc_object = true; break;
1196 case 'f': inc_func = true; break;
1197 case 'F': inc_file = true; break;
1198 case 'l': inc_local = true; break;
1199 case 'g': inc_global = true; break;
1200 case 'w': inc_weak = true; break;
1201 case 'd': inc_def = true; break;
1202 case 'u': inc_undef = true; break;
1203 case 'a': inc_abs = true; break;
1204 case 'c': inc_common = true; break;
1205 default: err("invalid symbol selector '%c'", *this_sym);
1206 }
1207 }
1208
1209 /* If no types are matched, not match all */
1210 if (!inc_notype && !inc_object && !inc_func && !inc_file)
1211 inc_notype = inc_object = inc_func = inc_file = true;
1212 if (!inc_local && !inc_global && !inc_weak)
1213 inc_local = inc_global = inc_weak = true;
1214 if (!inc_def && !inc_undef && !inc_abs && !inc_common)
1215 inc_def = inc_undef = inc_abs = inc_common = true;
1216
1217 /* backwards compat for defined/undefined short hand */
1218 } else if (*this_sym == '+') {
1219 inc_undef = false;
1220 ++this_sym;
1221 } else if (*this_sym == '-') {
1222 inc_def = inc_abs = inc_common = false;
1223 ++this_sym;
1224 }
1225
1226 /* filter symbols */
1227 if ((!inc_notype && stt == STT_NOTYPE) || \
1228 (!inc_object && stt == STT_OBJECT) || \
1229 (!inc_func && stt == STT_FUNC ) || \
1230 (!inc_file && stt == STT_FILE ) || \
1231 (!inc_local && stb == STB_LOCAL ) || \
1232 (!inc_global && stb == STB_GLOBAL) || \
1233 (!inc_weak && stb == STB_WEAK ) || \
1234 (!inc_def && shn && shn < SHN_LORESERVE) || \
1235 (!inc_undef && shn == SHN_UNDEF ) || \
1236 (!inc_abs && shn == SHN_ABS ) || \
1237 (!inc_common && shn == SHN_COMMON))
1238 continue;
1239
1240 if (*this_sym == '*') {
1241 /* a "*" symbol gets you debug output */
1242 printf("%s(%s) %5lX %15s %15s %15s %s\n",
1243 ((*found_sym == 0) ? "\n\t" : "\t"),
1244 elf->base_filename,
1245 size,
1246 get_elfstttype(stt),
1247 get_elfstbtype(stb),
1248 get_elfshntype(shn),
1249 symname);
1250 goto matched;
1251
1252 } else {
1253 if (g_match) {
1254 /* regex match the symbol */
1255 if (regexec(find_sym_regex_arr->eles[n], symname, 0, NULL, 0) == REG_NOMATCH)
1256 continue;
1257
1258 } else if (*this_sym) {
1259 /* give empty symbols a "pass", else do a normal compare */
1260 const size_t len = strlen(this_sym);
1261 if (!(strncmp(this_sym, symname, len) == 0 &&
1262 /* Accept unversioned symbol names */
1263 (symname[len] == '\0' || symname[len] == '@')))
1264 continue;
1265 }
1266
1267 if (be_semi_verbose) {
1268 char buf[1024];
1269 snprintf(buf, sizeof(buf), "%lX %s %s",
1270 size,
1271 get_elfstttype(stt),
1272 this_sym);
1273 *ret = xstrdup(buf);
1274 } else {
1275 if (*ret) xchrcat(ret, ',', ret_len);
1276 xstrcat(ret, symname, ret_len);
1277 }
1278
1279 goto matched;
1280 }
1281 }
1282
1283 return;
1284
1285 matched:
1286 *found_sym = 1;
1287 }
1288
1289 static const char *scanelf_file_sym(elfobj *elf, char *found_sym)
1290 {
1291 char *ret;
1292 void *symtab_void, *strtab_void;
1293
1294 if (!find_sym) return NULL;
1295 ret = NULL;
1296
1297 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
1298
1299 if (symtab_void && strtab_void) {
1300 #define FIND_SYM(B) \
1301 if (elf->elf_class == ELFCLASS ## B) { \
1302 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
1303 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
1304 Elf ## B ## _Sym *sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
1305 Elf ## B ## _Word i, cnt = EGET(symtab->sh_entsize); \
1306 char *symname; \
1307 size_t ret_len = 0; \
1308 if (cnt) \
1309 cnt = EGET(symtab->sh_size) / cnt; \
1310 for (i = 0; i < cnt; ++i) { \
1311 if ((void*)sym > elf->data_end) { \
1312 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1313 goto break_out; \
1314 } \
1315 if (sym->st_name) { \
1316 /* make sure the symbol name is in acceptable memory range */ \
1317 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
1318 if ((void*)symname > elf->data_end) { \
1319 warnf("%s: corrupt ELF symbols", elf->filename); \
1320 ++sym; \
1321 continue; \
1322 } \
1323 scanelf_match_symname(elf, found_sym, \
1324 &ret, &ret_len, symname, \
1325 ELF##B##_ST_TYPE(EGET(sym->st_info)), \
1326 ELF##B##_ST_BIND(EGET(sym->st_info)), \
1327 EGET(sym->st_shndx), \
1328 /* st_size can be 64bit, but no one is really that big, so screw em */ \
1329 EGET(sym->st_size)); \
1330 } \
1331 ++sym; \
1332 } \
1333 }
1334 FIND_SYM(32)
1335 FIND_SYM(64)
1336 }
1337
1338 break_out:
1339 if (be_wewy_wewy_quiet) return NULL;
1340
1341 if (*find_sym != '*' && *found_sym)
1342 return ret;
1343 if (be_quiet)
1344 return NULL;
1345 else
1346 return " - ";
1347 }
1348
1349 static const char *scanelf_file_sections(elfobj *elf, char *found_section)
1350 {
1351 if (!find_section)
1352 return NULL;
1353
1354 #define FIND_SECTION(B) \
1355 if (elf->elf_class == ELFCLASS ## B) { \
1356 size_t matched, n; \
1357 int invert; \
1358 const char *section_name; \
1359 Elf ## B ## _Shdr *section; \
1360 \
1361 matched = 0; \
1362 array_for_each(find_section_arr, n, section_name) { \
1363 invert = (*section_name == '!' ? 1 : 0); \
1364 section = SHDR ## B (elf_findsecbyname(elf, section_name + invert)); \
1365 if ((section == NULL && invert) || (section != NULL && !invert)) \
1366 ++matched; \
1367 } \
1368 \
1369 if (matched == array_cnt(find_section_arr)) \
1370 *found_section = 1; \
1371 }
1372 FIND_SECTION(32)
1373 FIND_SECTION(64)
1374
1375 if (be_wewy_wewy_quiet)
1376 return NULL;
1377
1378 if (*found_section)
1379 return find_section;
1380
1381 if (be_quiet)
1382 return NULL;
1383 else
1384 return " - ";
1385 }
1386
1387 /* scan an elf file and show all the fun stuff */
1388 #define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
1389 static int scanelf_elfobj(elfobj *elf)
1390 {
1391 unsigned long i;
1392 char found_pax, found_phdr, found_relro, found_load, found_textrel,
1393 found_rpath, found_needed, found_interp, found_bind, found_soname,
1394 found_sym, found_lib, found_file, found_textrels, found_section;
1395 static char *out_buffer = NULL;
1396 static size_t out_len;
1397
1398 found_pax = found_phdr = found_relro = found_load = found_textrel = \
1399 found_rpath = found_needed = found_interp = found_bind = found_soname = \
1400 found_sym = found_lib = found_file = found_textrels = found_section = 0;
1401
1402 if (be_verbose > 2)
1403 printf("%s: scanning file {%s,%s}\n", elf->filename,
1404 get_elfeitype(EI_CLASS, elf->elf_class),
1405 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
1406 else if (be_verbose > 1)
1407 printf("%s: scanning file\n", elf->filename);
1408
1409 /* init output buffer */
1410 if (!out_buffer) {
1411 out_len = sizeof(char) * 80;
1412 out_buffer = xmalloc(out_len);
1413 }
1414 *out_buffer = '\0';
1415
1416 /* show the header */
1417 if (!be_quiet && show_banner) {
1418 for (i = 0; out_format[i]; ++i) {
1419 if (!IS_MODIFIER(out_format[i])) continue;
1420
1421 switch (out_format[++i]) {
1422 case '+': break;
1423 case '%': break;
1424 case '#': break;
1425 case 'F':
1426 case 'p':
1427 case 'f': prints("FILE "); found_file = 1; break;
1428 case 'o': prints(" TYPE "); break;
1429 case 'x': prints(" PAX "); break;
1430 case 'e': prints("STK/REL/PTL "); break;
1431 case 't': prints("TEXTREL "); break;
1432 case 'r': prints("RPATH "); break;
1433 case 'M': prints("CLASS "); break;
1434 case 'l':
1435 case 'n': prints("NEEDED "); break;
1436 case 'i': prints("INTERP "); break;
1437 case 'b': prints("BIND "); break;
1438 case 'Z': prints("SIZE "); break;
1439 case 'S': prints("SONAME "); break;
1440 case 's': prints("SYM "); break;
1441 case 'N': prints("LIB "); break;
1442 case 'T': prints("TEXTRELS "); break;
1443 case 'k': prints("SECTION "); break;
1444 case 'a': prints("ARCH "); break;
1445 case 'I': prints("OSABI "); break;
1446 case 'Y': prints("EABI "); break;
1447 case 'O': prints("PERM "); break;
1448 case 'D': prints("ENDIAN "); break;
1449 default: warnf("'%c' has no title ?", out_format[i]);
1450 }
1451 }
1452 if (!found_file) prints("FILE ");
1453 prints("\n");
1454 found_file = 0;
1455 show_banner = 0;
1456 }
1457
1458 /* dump all the good stuff */
1459 for (i = 0; out_format[i]; ++i) {
1460 const char *out;
1461 const char *tmp;
1462 static char ubuf[sizeof(unsigned long)*2];
1463 if (!IS_MODIFIER(out_format[i])) {
1464 xchrcat(&out_buffer, out_format[i], &out_len);
1465 continue;
1466 }
1467
1468 out = NULL;
1469 be_wewy_wewy_quiet = (out_format[i] == '#');
1470 be_semi_verbose = (out_format[i] == '+');
1471 switch (out_format[++i]) {
1472 case '+':
1473 case '%':
1474 case '#':
1475 xchrcat(&out_buffer, out_format[i], &out_len); break;
1476 case 'F':
1477 found_file = 1;
1478 if (be_wewy_wewy_quiet) break;
1479 xstrcat(&out_buffer, elf->filename, &out_len);
1480 break;
1481 case 'p':
1482 found_file = 1;
1483 if (be_wewy_wewy_quiet) break;
1484 tmp = elf->filename;
1485 if (search_path) {
1486 ssize_t len_search = strlen(search_path);
1487 ssize_t len_file = strlen(elf->filename);
1488 if (!strncmp(elf->filename, search_path, len_search) && \
1489 len_file > len_search)
1490 tmp += len_search;
1491 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1492 }
1493 xstrcat(&out_buffer, tmp, &out_len);
1494 break;
1495 case 'f':
1496 found_file = 1;
1497 if (be_wewy_wewy_quiet) break;
1498 tmp = strrchr(elf->filename, '/');
1499 tmp = (tmp == NULL ? elf->filename : tmp+1);
1500 xstrcat(&out_buffer, tmp, &out_len);
1501 break;
1502 case 'o': out = get_elfetype(elf); break;
1503 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
1504 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
1505 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1506 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
1507 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1508 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1509 case 'D': out = get_endian(elf); break;
1510 case 'O': out = strfileperms(elf->filename); break;
1511 case 'n':
1512 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
1513 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1514 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1515 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
1516 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1517 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1518 case 'a': out = get_elfemtype(elf); break;
1519 case 'I': out = get_elfosabi(elf); break;
1520 case 'Y': out = get_elf_eabi(elf); break;
1521 case 'Z': snprintf(ubuf, sizeof(ubuf), "%lu", (unsigned long)elf->len); out = ubuf; break;;
1522 default: warnf("'%c' has no scan code?", out_format[i]);
1523 }
1524 if (out)
1525 xstrcat(&out_buffer, out, &out_len);
1526 }
1527
1528 #define FOUND_SOMETHING() \
1529 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1530 found_rpath || found_needed || found_interp || found_bind || \
1531 found_soname || found_sym || found_lib || found_textrels || found_section )
1532
1533 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1534 xchrcat(&out_buffer, ' ', &out_len);
1535 xstrcat(&out_buffer, elf->filename, &out_len);
1536 }
1537 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
1538 puts(out_buffer);
1539 fflush(stdout);
1540 }
1541
1542 return 0;
1543 }
1544
1545 /* scan a single elf */
1546 static int scanelf_elf(const char *filename, int fd, size_t len)
1547 {
1548 int ret = 1;
1549 elfobj *elf;
1550
1551 /* verify this is real ELF */
1552 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1553 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1554 return 2;
1555 }
1556 switch (match_bits) {
1557 case 32:
1558 if (elf->elf_class != ELFCLASS32)
1559 goto label_done;
1560 break;
1561 case 64:
1562 if (elf->elf_class != ELFCLASS64)
1563 goto label_done;
1564 break;
1565 default: break;
1566 }
1567 if (match_etypes) {
1568 char sbuf[126];
1569 strncpy(sbuf, match_etypes, sizeof(sbuf));
1570 if (strchr(match_etypes, ',') != NULL) {
1571 char *p;
1572 while ((p = strrchr(sbuf, ',')) != NULL) {
1573 *p = 0;
1574 if (etype_lookup(p+1) == get_etype(elf))
1575 goto label_ret;
1576 }
1577 }
1578 if (etype_lookup(sbuf) != get_etype(elf))
1579 goto label_done;
1580 }
1581
1582 label_ret:
1583 ret = scanelf_elfobj(elf);
1584
1585 label_done:
1586 unreadelf(elf);
1587 return ret;
1588 }
1589
1590 /* scan an archive of elfs */
1591 static int scanelf_archive(const char *filename, int fd, size_t len)
1592 {
1593 archive_handle *ar;
1594 archive_member *m;
1595 char *ar_buffer;
1596 elfobj *elf;
1597
1598 ar = ar_open_fd(filename, fd);
1599 if (ar == NULL)
1600 return 1;
1601
1602 ar_buffer = mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1603 while ((m = ar_next(ar)) != NULL) {
1604 off_t cur_pos = lseek(fd, 0, SEEK_CUR);
1605 if (cur_pos == -1)
1606 errp("lseek() failed");
1607 elf = readelf_buffer(m->name, ar_buffer + cur_pos, m->size);
1608 if (elf) {
1609 scanelf_elfobj(elf);
1610 unreadelf(elf);
1611 }
1612 }
1613 munmap(ar_buffer, len);
1614
1615 return 0;
1616 }
1617 /* scan a file which may be an elf or an archive or some other magical beast */
1618 static int scanelf_fileat(int dir_fd, const char *filename, const struct stat *st_cache)
1619 {
1620 const struct stat *st = st_cache;
1621 struct stat symlink_st;
1622 int fd;
1623
1624 /* always handle regular files and handle symlinked files if no -y */
1625 if (S_ISLNK(st->st_mode)) {
1626 if (!scan_symlink)
1627 return 1;
1628 fstatat(dir_fd, filename, &symlink_st, 0);
1629 st = &symlink_st;
1630 }
1631
1632 if (!S_ISREG(st->st_mode)) {
1633 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1634 return 1;
1635 }
1636
1637 if (match_perms) {
1638 if ((st->st_mode | match_perms) != st->st_mode)
1639 return 1;
1640 }
1641 fd = openat(dir_fd, filename, (fix_elf ? O_RDWR : O_RDONLY) | O_CLOEXEC);
1642 if (fd == -1) {
1643 if (fix_elf && errno == ETXTBSY)
1644 warnp("%s: could not fix", filename);
1645 else if (be_verbose > 2)
1646 printf("%s: skipping file: %s\n", filename, strerror(errno));
1647 return 1;
1648 }
1649
1650 if (scanelf_elf(filename, fd, st->st_size) == 2) {
1651 /* if it isn't an ELF, maybe it's an .a archive */
1652 if (scan_archives)
1653 scanelf_archive(filename, fd, st->st_size);
1654
1655 /*
1656 * unreadelf() implicitly closes its fd, so only close it
1657 * when we are returning it in the non-ELF case
1658 */
1659 close(fd);
1660 }
1661
1662 return 0;
1663 }
1664
1665 /* scan a directory for ET_EXEC files and print when we find one */
1666 static int scanelf_dirat(int dir_fd, const char *path)
1667 {
1668 register DIR *dir;
1669 register struct dirent *dentry;
1670 struct stat st_top, st;
1671 char buf[__PAX_UTILS_PATH_MAX], *subpath;
1672 size_t pathlen = 0, len = 0;
1673 int ret = 0;
1674 int subdir_fd;
1675
1676 /* make sure path exists */
1677 if (fstatat(dir_fd, path, &st_top, AT_SYMLINK_NOFOLLOW) == -1) {
1678 if (be_verbose > 2) printf("%s: does not exist\n", path);
1679 return 1;
1680 }
1681
1682 /* ok, if it isn't a directory, assume we can open it */
1683 if (!S_ISDIR(st_top.st_mode))
1684 return scanelf_fileat(dir_fd, path, &st_top);
1685
1686 /* now scan the dir looking for fun stuff */
1687 subdir_fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
1688 if (subdir_fd == -1)
1689 dir = NULL;
1690 else
1691 dir = fdopendir(subdir_fd);
1692 if (dir == NULL) {
1693 if (subdir_fd != -1)
1694 close(subdir_fd);
1695 else if (be_verbose > 2)
1696 printf("%s: skipping dir: %s\n", path, strerror(errno));
1697 return 1;
1698 }
1699 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1700
1701 subpath = stpcpy(buf, path);
1702 if (subpath[-1] != '/')
1703 *subpath++ = '/';
1704 pathlen = subpath - buf;
1705 while ((dentry = readdir(dir))) {
1706 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1707 continue;
1708
1709 if (fstatat(subdir_fd, dentry->d_name, &st, AT_SYMLINK_NOFOLLOW) == -1)
1710 continue;
1711
1712 len = strlen(dentry->d_name);
1713 if (len + pathlen + 1 >= sizeof(buf)) {
1714 warnf("Skipping '%s%s': len > sizeof(buf); %zu > %zu\n",
1715 path, dentry->d_name, len + pathlen + 1, sizeof(buf));
1716 continue;
1717 }
1718 memcpy(subpath, dentry->d_name, len);
1719 subpath[len] = '\0';
1720
1721 if (S_ISREG(st.st_mode))
1722 ret = scanelf_fileat(dir_fd, buf, &st);
1723 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1724 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1725 ret = scanelf_dirat(dir_fd, buf);
1726 }
1727 }
1728 closedir(dir);
1729
1730 return ret;
1731 }
1732 static int scanelf_dir(const char *path)
1733 {
1734 return scanelf_dirat(root_fd, root_rel_path(path));
1735 }
1736
1737 static int scanelf_from_file(const char *filename)
1738 {
1739 FILE *fp;
1740 char *p, *path;
1741 size_t len;
1742 int ret;
1743
1744 if (strcmp(filename, "-") == 0)
1745 fp = stdin;
1746 else if ((fp = fopen(filename, "r")) == NULL)
1747 return 1;
1748
1749 path = NULL;
1750 len = 0;
1751 ret = 0;
1752 while (getline(&path, &len, fp) != -1) {
1753 if ((p = strchr(path, '\n')) != NULL)
1754 *p = 0;
1755 search_path = path;
1756 ret = scanelf_dir(path);
1757 }
1758 free(path);
1759
1760 if (fp != stdin)
1761 fclose(fp);
1762
1763 return ret;
1764 }
1765
1766 #if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1767
1768 static int _load_ld_cache_config(const char *fname)
1769 {
1770 FILE *fp = NULL;
1771 char *p, *path;
1772 size_t len;
1773 int curr_fd = -1;
1774
1775 fp = fopenat_r(root_fd, root_rel_path(fname));
1776 if (fp == NULL)
1777 return -1;
1778
1779 path = NULL;
1780 len = 0;
1781 while (getline(&path, &len, fp) != -1) {
1782 if ((p = strrchr(path, '\r')) != NULL)
1783 *p = 0;
1784 if ((p = strchr(path, '\n')) != NULL)
1785 *p = 0;
1786
1787 /* recursive includes of the same file will make this segfault. */
1788 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1789 glob_t gl;
1790 size_t x;
1791 const char *gpath;
1792
1793 /* re-use existing path buffer ... need to be creative */
1794 if (path[8] != '/')
1795 gpath = memcpy(path + 3, "/etc/", 5);
1796 else
1797 gpath = path + 8;
1798 if (root_fd != AT_FDCWD) {
1799 if (curr_fd == -1) {
1800 curr_fd = open(".", O_RDONLY|O_CLOEXEC);
1801 if (fchdir(root_fd))
1802 errp("unable to change to root dir");
1803 }
1804 gpath = root_rel_path(gpath);
1805 }
1806
1807 if (glob(gpath, 0, NULL, &gl) == 0) {
1808 for (x = 0; x < gl.gl_pathc; ++x) {
1809 /* try to avoid direct loops */
1810 if (strcmp(gl.gl_pathv[x], fname) == 0)
1811 continue;
1812 _load_ld_cache_config(gl.gl_pathv[x]);
1813 }
1814 globfree(&gl);
1815 }
1816
1817 /* failed globs are ignored by glibc */
1818 continue;
1819 }
1820
1821 if (*path != '/')
1822 continue;
1823
1824 xarraypush_str(ldpaths, path);
1825 }
1826 free(path);
1827
1828 fclose(fp);
1829
1830 if (curr_fd != -1) {
1831 if (fchdir(curr_fd))
1832 /* don't care */;
1833 close(curr_fd);
1834 }
1835
1836 return 0;
1837 }
1838
1839 #elif defined(__FreeBSD__) || defined(__DragonFly__)
1840
1841 static int _load_ld_cache_config(const char *fname)
1842 {
1843 FILE *fp = NULL;
1844 char *b = NULL, *p;
1845 struct elfhints_hdr hdr;
1846
1847 fp = fopenat_r(root_fd, root_rel_path(fname));
1848 if (fp == NULL)
1849 return -1;
1850
1851 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1852 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1853 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1854 {
1855 fclose(fp);
1856 return -1;
1857 }
1858
1859 b = xmalloc(hdr.dirlistlen + 1);
1860 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1861 fclose(fp);
1862 free(b);
1863 return -1;
1864 }
1865
1866 while ((p = strsep(&b, ":"))) {
1867 if (*p == '\0')
1868 continue;
1869 xarraypush_str(ldpaths, p);
1870 }
1871
1872 free(b);
1873 fclose(fp);
1874 return 0;
1875 }
1876
1877 #else
1878 #ifdef __ELF__
1879 #warning Cache config support not implemented for your target
1880 #endif
1881 static int _load_ld_cache_config(const char *fname)
1882 {
1883 return 0;
1884 }
1885 #endif
1886
1887 static void load_ld_cache_config(const char *fname)
1888 {
1889 bool scan_l, scan_ul, scan_ull;
1890 size_t n;
1891 const char *ldpath;
1892
1893 _load_ld_cache_config(fname);
1894
1895 scan_l = scan_ul = scan_ull = false;
1896 if (array_cnt(ldpaths)) {
1897 array_for_each(ldpaths, n, ldpath) {
1898 if (!scan_l && !strcmp(ldpath, "/lib")) scan_l = true;
1899 if (!scan_ul && !strcmp(ldpath, "/usr/lib")) scan_ul = true;
1900 if (!scan_ull && !strcmp(ldpath, "/usr/local/lib")) scan_ull = true;
1901 }
1902 }
1903
1904 if (!scan_l) xarraypush_str(ldpaths, "/lib");
1905 if (!scan_ul) xarraypush_str(ldpaths, "/usr/lib");
1906 if (!scan_ull) xarraypush_str(ldpaths, "/usr/local/lib");
1907 }
1908
1909 /* scan /etc/ld.so.conf for paths */
1910 static void scanelf_ldpath(void)
1911 {
1912 size_t n;
1913 const char *ldpath;
1914
1915 array_for_each(ldpaths, n, ldpath)
1916 scanelf_dir(ldpath);
1917 }
1918
1919 /* scan env PATH for paths */
1920 static void scanelf_envpath(void)
1921 {
1922 char *path, *p;
1923
1924 path = getenv("PATH");
1925 if (!path)
1926 err("PATH is not set in your env !");
1927 path = xstrdup(path);
1928
1929 while ((p = strrchr(path, ':')) != NULL) {
1930 scanelf_dir(p + 1);
1931 *p = 0;
1932 }
1933
1934 free(path);
1935 }
1936
1937 /* usage / invocation handling functions */ /* Free Flags: c d j u w G H J K P Q U W */
1938 #define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZCBhV"
1939 #define a_argument required_argument
1940 static struct option const long_opts[] = {
1941 {"path", no_argument, NULL, 'p'},
1942 {"ldpath", no_argument, NULL, 'l'},
1943 {"use-ldpath",no_argument, NULL, 129},
1944 {"root", a_argument, NULL, 128},
1945 {"recursive", no_argument, NULL, 'R'},
1946 {"mount", no_argument, NULL, 'm'},
1947 {"symlink", no_argument, NULL, 'y'},
1948 {"archives", no_argument, NULL, 'A'},
1949 {"ldcache", no_argument, NULL, 'L'},
1950 {"fix", no_argument, NULL, 'X'},
1951 {"setpax", a_argument, NULL, 'z'},
1952 {"pax", no_argument, NULL, 'x'},
1953 {"header", no_argument, NULL, 'e'},
1954 {"textrel", no_argument, NULL, 't'},
1955 {"rpath", no_argument, NULL, 'r'},
1956 {"needed", no_argument, NULL, 'n'},
1957 {"interp", no_argument, NULL, 'i'},
1958 {"bind", no_argument, NULL, 'b'},
1959 {"soname", no_argument, NULL, 'S'},
1960 {"symbol", a_argument, NULL, 's'},
1961 {"section", a_argument, NULL, 'k'},
1962 {"lib", a_argument, NULL, 'N'},
1963 {"gmatch", no_argument, NULL, 'g'},
1964 {"textrels", no_argument, NULL, 'T'},
1965 {"etype", a_argument, NULL, 'E'},
1966 {"bits", a_argument, NULL, 'M'},
1967 {"endian", no_argument, NULL, 'D'},
1968 {"osabi", no_argument, NULL, 'I'},
1969 {"eabi", no_argument, NULL, 'Y'},
1970 {"perms", a_argument, NULL, 'O'},
1971 {"size", no_argument, NULL, 'Z'},
1972 {"all", no_argument, NULL, 'a'},
1973 {"quiet", no_argument, NULL, 'q'},
1974 {"verbose", no_argument, NULL, 'v'},
1975 {"format", a_argument, NULL, 'F'},
1976 {"from", a_argument, NULL, 'f'},
1977 {"file", a_argument, NULL, 'o'},
1978 {"nocolor", no_argument, NULL, 'C'},
1979 {"nobanner", no_argument, NULL, 'B'},
1980 {"help", no_argument, NULL, 'h'},
1981 {"version", no_argument, NULL, 'V'},
1982 {NULL, no_argument, NULL, 0x0}
1983 };
1984
1985 static const char * const opts_help[] = {
1986 "Scan all directories in PATH environment",
1987 "Scan all directories in /etc/ld.so.conf",
1988 "Use ld.so.conf to show full path (use with -r/-n)",
1989 "Root directory (use with -l or -p)",
1990 "Scan directories recursively",
1991 "Don't recursively cross mount points",
1992 "Don't scan symlinks",
1993 "Scan archives (.a files)",
1994 "Utilize ld.so.cache to show full path (use with -r/-n)",
1995 "Try and 'fix' bad things (use with -r/-e)",
1996 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1997 "Print PaX markings",
1998 "Print GNU_STACK/PT_LOAD markings",
1999 "Print TEXTREL information",
2000 "Print RPATH information",
2001 "Print NEEDED information",
2002 "Print INTERP information",
2003 "Print BIND information",
2004 "Print SONAME information",
2005 "Find a specified symbol",
2006 "Find a specified section",
2007 "Find a specified library",
2008 "Use regex rather than string compare (with -s); specify twice for case insensitive",
2009 "Locate cause of TEXTREL",
2010 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
2011 "Print only ELF files matching numeric bits",
2012 "Print Endianness",
2013 "Print OSABI",
2014 "Print EABI (EM_ARM Only)",
2015 "Print only ELF files matching octal permissions",
2016 "Print ELF file size",
2017 "Print all useful/simple info\n",
2018 "Only output 'bad' things",
2019 "Be verbose (can be specified more than once)",
2020 "Use specified format for output",
2021 "Read input stream from a filename",
2022 "Write output stream to a filename",
2023 "Don't emit color in output",
2024 "Don't display the header",
2025 "Print this help and exit",
2026 "Print version and exit",
2027 NULL
2028 };
2029
2030 /* display usage and exit */
2031 static void usage(int status)
2032 {
2033 const char a_arg[] = "<arg>";
2034 size_t a_arg_len = strlen(a_arg) + 2;
2035 size_t i;
2036 int optlen;
2037 printf("* Scan ELF binaries for stuff\n\n"
2038 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
2039 printf("Options: -[%s]\n", PARSE_FLAGS);
2040
2041 /* prescan the --long opt length to auto-align */
2042 optlen = 0;
2043 for (i = 0; long_opts[i].name; ++i) {
2044 int l = strlen(long_opts[i].name);
2045 if (long_opts[i].has_arg == a_argument)
2046 l += a_arg_len;
2047 optlen = max(l, optlen);
2048 }
2049
2050 for (i = 0; long_opts[i].name; ++i) {
2051 /* first output the short flag if it has one */
2052 if (long_opts[i].val > '~')
2053 printf(" ");
2054 else
2055 printf(" -%c, ", long_opts[i].val);
2056
2057 /* then the long flag */
2058 if (long_opts[i].has_arg == no_argument)
2059 printf("--%-*s", optlen, long_opts[i].name);
2060 else
2061 printf("--%s %s %*s", long_opts[i].name, a_arg,
2062 (int)(optlen - strlen(long_opts[i].name) - a_arg_len), "");
2063
2064 /* finally the help text */
2065 printf("* %s\n", opts_help[i]);
2066 }
2067
2068 puts("\nFor more information, see the scanelf(1) manpage");
2069 exit(status);
2070 }
2071
2072 /* parse command line arguments and preform needed actions */
2073 #define do_pax_state(option, flag) \
2074 if (islower(option)) { \
2075 flags &= ~PF_##flag; \
2076 flags |= PF_NO##flag; \
2077 } else { \
2078 flags &= ~PF_NO##flag; \
2079 flags |= PF_##flag; \
2080 }
2081 static int parseargs(int argc, char *argv[])
2082 {
2083 int i;
2084 const char *from_file = NULL;
2085 int ret = 0;
2086 char load_cache_config = 0;
2087
2088 opterr = 0;
2089 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
2090 switch (i) {
2091
2092 case 'V':
2093 printf("pax-utils-%s: %s compiled %s\n%s\n"
2094 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
2095 VERSION, __FILE__, __DATE__, rcsid, argv0);
2096 exit(EXIT_SUCCESS);
2097 break;
2098 case 'h': usage(EXIT_SUCCESS); break;
2099 case 'f':
2100 if (from_file) warn("You prob don't want to specify -f twice");
2101 from_file = optarg;
2102 break;
2103 case 'E':
2104 match_etypes = optarg;
2105 break;
2106 case 'M':
2107 match_bits = atoi(optarg);
2108 if (match_bits == 0) {
2109 if (strcmp(optarg, "ELFCLASS32") == 0)
2110 match_bits = 32;
2111 if (strcmp(optarg, "ELFCLASS64") == 0)
2112 match_bits = 64;
2113 }
2114 break;
2115 case 'O':
2116 if (sscanf(optarg, "%o", &match_perms) == -1)
2117 match_bits = 0;
2118 break;
2119 case 'o': {
2120 if (freopen(optarg, "w", stdout) == NULL)
2121 errp("Could not freopen(%s)", optarg);
2122 break;
2123 }
2124 case 'k':
2125 xarraypush_str(find_section_arr, optarg);
2126 break;
2127 case 's': {
2128 /* historically, this was comma delimited */
2129 char *this_sym = strtok(optarg, ",");
2130 if (!this_sym) /* edge case: -s '' */
2131 xarraypush_str(find_sym_arr, "");
2132 while (this_sym) {
2133 xarraypush_str(find_sym_arr, this_sym);
2134 this_sym = strtok(NULL, ",");
2135 }
2136 break;
2137 }
2138 case 'N':
2139 xarraypush_str(find_lib_arr, optarg);
2140 break;
2141 case 'F': {
2142 if (out_format) warn("You prob don't want to specify -F twice");
2143 out_format = optarg;
2144 break;
2145 }
2146 case 'z': {
2147 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
2148 size_t x;
2149
2150 for (x = 0; x < strlen(optarg); x++) {
2151 switch (optarg[x]) {
2152 case 'p':
2153 case 'P':
2154 do_pax_state(optarg[x], PAGEEXEC);
2155 break;
2156 case 's':
2157 case 'S':
2158 do_pax_state(optarg[x], SEGMEXEC);
2159 break;
2160 case 'm':
2161 case 'M':
2162 do_pax_state(optarg[x], MPROTECT);
2163 break;
2164 case 'e':
2165 case 'E':
2166 do_pax_state(optarg[x], EMUTRAMP);
2167 break;
2168 case 'r':
2169 case 'R':
2170 do_pax_state(optarg[x], RANDMMAP);
2171 break;
2172 case 'x':
2173 case 'X':
2174 do_pax_state(optarg[x], RANDEXEC);
2175 break;
2176 default:
2177 break;
2178 }
2179 }
2180 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
2181 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
2182 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
2183 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
2184 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
2185 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
2186 setpax = flags;
2187 break;
2188 }
2189 case 'Z': show_size = 1; break;
2190 case 'g': ++g_match; break;
2191 case 'L': load_cache_config = use_ldcache = 1; break;
2192 case 'y': scan_symlink = 0; break;
2193 case 'A': scan_archives = 1; break;
2194 case 'C': color_init(true); break;
2195 case 'B': show_banner = 0; break;
2196 case 'l': load_cache_config = scan_ldpath = 1; break;
2197 case 'p': scan_envpath = 1; break;
2198 case 'R': dir_recurse = 1; break;
2199 case 'm': dir_crossmount = 0; break;
2200 case 'X': ++fix_elf; break;
2201 case 'x': show_pax = 1; break;
2202 case 'e': show_phdr = 1; break;
2203 case 't': show_textrel = 1; break;
2204 case 'r': show_rpath = 1; break;
2205 case 'n': show_needed = 1; break;
2206 case 'i': show_interp = 1; break;
2207 case 'b': show_bind = 1; break;
2208 case 'S': show_soname = 1; break;
2209 case 'T': show_textrels = 1; break;
2210 case 'q': be_quiet = min(be_quiet, 20) + 1; break;
2211 case 'v': be_verbose = min(be_verbose, 20) + 1; break;
2212 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
2213 case 'D': show_endian = 1; break;
2214 case 'I': show_osabi = 1; break;
2215 case 'Y': show_eabi = 1; break;
2216 case 128:
2217 root_fd = open(optarg, O_RDONLY|O_CLOEXEC);
2218 if (root_fd == -1)
2219 err("Could not open root: %s", optarg);
2220 break;
2221 case 129: load_cache_config = use_ldpath = 1; break;
2222 case ':':
2223 err("Option '%c' is missing parameter", optopt);
2224 case '?':
2225 err("Unknown option '%c' or argument missing", optopt);
2226 default:
2227 err("Unhandled option '%c'; please report this", i);
2228 }
2229 }
2230 if (show_textrels && be_verbose)
2231 has_objdump = bin_in_path("objdump");
2232 /* precompile all the regexes */
2233 if (g_match) {
2234 regex_t preg;
2235 const char *this_sym;
2236 size_t n;
2237 int flags = REG_EXTENDED | REG_NOSUB | (g_match > 1 ? REG_ICASE : 0);
2238
2239 array_for_each(find_sym_arr, n, this_sym) {
2240 /* see scanelf_match_symname for logic info */
2241 switch (this_sym[0]) {
2242 case '%':
2243 while (*(this_sym++))
2244 if (*this_sym == '%') {
2245 ++this_sym;
2246 break;
2247 }
2248 break;
2249 case '+':
2250 case '-':
2251 ++this_sym;
2252 break;
2253 }
2254 if (*this_sym == '*')
2255 ++this_sym;
2256
2257 ret = regcomp(&preg, this_sym, flags);
2258 if (ret) {
2259 char err[256];
2260 regerror(ret, &preg, err, sizeof(err));
2261 err("regcomp of %s failed: %s", this_sym, err);
2262 }
2263 xarraypush(find_sym_regex_arr, &preg, sizeof(preg));
2264 }
2265 }
2266 /* flatten arrays for display */
2267 if (array_cnt(find_sym_arr))
2268 find_sym = array_flatten_str(find_sym_arr);
2269 if (array_cnt(find_lib_arr))
2270 find_lib = array_flatten_str(find_lib_arr);
2271 if (array_cnt(find_section_arr))
2272 find_section = array_flatten_str(find_section_arr);
2273 /* let the format option override all other options */
2274 if (out_format) {
2275 show_pax = show_phdr = show_textrel = show_rpath = \
2276 show_needed = show_interp = show_bind = show_soname = \
2277 show_textrels = show_perms = show_endian = show_size = \
2278 show_osabi = show_eabi = 0;
2279 for (i = 0; out_format[i]; ++i) {
2280 if (!IS_MODIFIER(out_format[i])) continue;
2281
2282 switch (out_format[++i]) {
2283 case '+': break;
2284 case '%': break;
2285 case '#': break;
2286 case 'F': break;
2287 case 'p': break;
2288 case 'f': break;
2289 case 'k': break;
2290 case 's': break;
2291 case 'N': break;
2292 case 'o': break;
2293 case 'a': break;
2294 case 'M': break;
2295 case 'Z': show_size = 1; break;
2296 case 'D': show_endian = 1; break;
2297 case 'I': show_osabi = 1; break;
2298 case 'Y': show_eabi = 1; break;
2299 case 'O': show_perms = 1; break;
2300 case 'x': show_pax = 1; break;
2301 case 'e': show_phdr = 1; break;
2302 case 't': show_textrel = 1; break;
2303 case 'r': show_rpath = 1; break;
2304 case 'n': show_needed = 1; break;
2305 case 'i': show_interp = 1; break;
2306 case 'b': show_bind = 1; break;
2307 case 'S': show_soname = 1; break;
2308 case 'T': show_textrels = 1; break;
2309 default:
2310 err("invalid format specifier '%c' (byte %i)",
2311 out_format[i], i+1);
2312 }
2313 }
2314
2315 /* construct our default format */
2316 } else {
2317 size_t fmt_len = 30;
2318 out_format = xmalloc(sizeof(char) * fmt_len);
2319 *out_format = '\0';
2320 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
2321 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
2322 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
2323 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
2324 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
2325 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
2326 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
2327 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
2328 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
2329 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
2330 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
2331 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
2332 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
2333 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
2334 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
2335 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
2336 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
2337 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
2338 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
2339 }
2340 if (be_verbose > 2) printf("Format: %s\n", out_format);
2341
2342 /* now lets actually do the scanning */
2343 if (load_cache_config)
2344 load_ld_cache_config(__PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
2345 if (scan_ldpath) scanelf_ldpath();
2346 if (scan_envpath) scanelf_envpath();
2347 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
2348 from_file = "-";
2349 if (from_file) {
2350 scanelf_from_file(from_file);
2351 from_file = *argv;
2352 }
2353 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
2354 err("Nothing to scan !?");
2355 while (optind < argc) {
2356 search_path = argv[optind++];
2357 ret = scanelf_dir(search_path);
2358 }
2359
2360 #ifdef __PAX_UTILS_CLEANUP
2361 /* clean up */
2362 xarrayfree(ldpaths);
2363 xarrayfree(find_sym_arr);
2364 xarrayfree(find_lib_arr);
2365 xarrayfree(find_section_arr);
2366 free(find_sym);
2367 free(find_lib);
2368 free(find_section);
2369 {
2370 size_t n;
2371 regex_t *preg;
2372 array_for_each(find_sym_regex_arr, n, preg)
2373 regfree(preg);
2374 xarrayfree(find_sym_regex_arr);
2375 }
2376
2377 if (ldcache != 0)
2378 munmap(ldcache, ldcache_size);
2379 #endif
2380
2381 return ret;
2382 }
2383
2384 static char **get_split_env(const char *envvar)
2385 {
2386 const char *delims = " \t\n";
2387 char **envvals = NULL;
2388 char *env, *s;
2389 int nentry;
2390
2391 if ((env = getenv(envvar)) == NULL)
2392 return NULL;
2393
2394 env = xstrdup(env);
2395 if (env == NULL)
2396 return NULL;
2397
2398 s = strtok(env, delims);
2399 if (s == NULL) {
2400 free(env);
2401 return NULL;
2402 }
2403
2404 nentry = 0;
2405 while (s != NULL) {
2406 ++nentry;
2407 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
2408 envvals[nentry-1] = s;
2409 s = strtok(NULL, delims);
2410 }
2411 envvals[nentry] = NULL;
2412
2413 /* don't want to free(env) as it contains the memory that backs
2414 * the envvals array of strings */
2415 return envvals;
2416 }
2417
2418 static void parseenv(void)
2419 {
2420 color_init(false);
2421 qa_textrels = get_split_env("QA_TEXTRELS");
2422 qa_execstack = get_split_env("QA_EXECSTACK");
2423 qa_wx_load = get_split_env("QA_WX_LOAD");
2424 }
2425
2426 #ifdef __PAX_UTILS_CLEANUP
2427 static void cleanup(void)
2428 {
2429 free(out_format);
2430 free(qa_textrels);
2431 free(qa_execstack);
2432 free(qa_wx_load);
2433 }
2434 #endif
2435
2436 int main(int argc, char *argv[])
2437 {
2438 int ret;
2439 if (argc < 2)
2440 usage(EXIT_FAILURE);
2441 parseenv();
2442 ret = parseargs(argc, argv);
2443 fclose(stdout);
2444 #ifdef __PAX_UTILS_CLEANUP
2445 cleanup();
2446 warn("The calls to add/delete heap should be off:\n"
2447 "\t- 1 due to the out_buffer not being freed in scanelf_fileat()\n"
2448 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
2449 #endif
2450 return ret;
2451 }
2452
2453 /* Match filename against entries in matchlist, return TRUE
2454 * if the file is listed */
2455 static int file_matches_list(const char *filename, char **matchlist)
2456 {
2457 char **file;
2458 char *match;
2459 char buf[__PAX_UTILS_PATH_MAX];
2460
2461 if (matchlist == NULL)
2462 return 0;
2463
2464 for (file = matchlist; *file != NULL; file++) {
2465 if (search_path) {
2466 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2467 match = buf;
2468 } else {
2469 match = *file;
2470 }
2471 if (fnmatch(match, filename, 0) == 0)
2472 return 1;
2473 }
2474 return 0;
2475 }

  ViewVC Help
Powered by ViewVC 1.1.20