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Revision 1.260 - (show annotations) (download) (as text)
Sat Jan 11 00:28:49 2014 UTC (7 months, 2 weeks ago) by vapier
Branch: MAIN
Changes since 1.259: +6 -6 lines
File MIME type: text/x-csrc
scanelf: fix comment in middle of define

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 1.259 2013/08/14 21:09:57 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 1.259 2013/08/14 21:09:57 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 /* let's flag -w/+x object files since the final ELF will most likely \
383 * need write access to the stack (who doesn't !?). so the combined \
384 * output will bring in +w automatically and that's bad. \
385 */ \
386 check_flags = /*SHF_WRITE|*/SHF_EXECINSTR; \
387 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
388 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
389 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
390 str = elf->data + offset; \
391 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
392 if (!strcmp(str, NOTE_GNU_STACK)) { \
393 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
394 flags = EGET(shdr[i].sh_flags); \
395 if (be_quiet && ((flags & check_flags) != check_flags)) \
396 continue; \
397 ++*found_phdr; \
398 shown = 1; \
399 if (flags & SHF_WRITE) ret[0] = 'W'; \
400 if (flags & SHF_ALLOC) ret[1] = 'A'; \
401 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
402 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
403 break; \
404 } \
405 } \
406 skip_this_shdr##B: \
407 if (!multi_stack) { \
408 if (file_matches_list(elf->filename, qa_execstack)) \
409 return NULL; \
410 *found_phdr = 1; \
411 shown = 1; \
412 memcpy(ret, "!WX", 3); \
413 } \
414 } \
415 }
416 SHOW_PHDR(32)
417 SHOW_PHDR(64)
418
419 if (be_wewy_wewy_quiet || (be_quiet && !shown))
420 return NULL;
421 else
422 return ret;
423 }
424
425 /*
426 * See if this ELF contains a DT_TEXTREL tag in any of its
427 * PT_DYNAMIC sections.
428 */
429 static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
430 {
431 static const char *ret = "TEXTREL";
432 unsigned long i;
433
434 if (!show_textrel && !show_textrels) return NULL;
435
436 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
437
438 if (elf->phdr) {
439 #define SHOW_TEXTREL(B) \
440 if (elf->elf_class == ELFCLASS ## B) { \
441 Elf ## B ## _Dyn *dyn; \
442 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
443 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
444 Elf ## B ## _Off offset; \
445 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
446 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
447 offset = EGET(phdr[i].p_offset); \
448 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
449 dyn = DYN ## B (elf->vdata + offset); \
450 while (EGET(dyn->d_tag) != DT_NULL) { \
451 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
452 *found_textrel = 1; \
453 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
454 return (be_wewy_wewy_quiet ? NULL : ret); \
455 } \
456 ++dyn; \
457 } \
458 } }
459 SHOW_TEXTREL(32)
460 SHOW_TEXTREL(64)
461 }
462
463 if (be_quiet || be_wewy_wewy_quiet)
464 return NULL;
465 else
466 return " - ";
467 }
468
469 /*
470 * Scan the .text section to see if there are any relocations in it.
471 * Should rewrite this to check PT_LOAD sections that are marked
472 * Executable rather than the section named '.text'.
473 */
474 static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
475 {
476 unsigned long s, r, rmax;
477 void *symtab_void, *strtab_void, *text_void;
478
479 if (!show_textrels) return NULL;
480
481 /* don't search for TEXTREL's if the ELF doesn't have any */
482 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
483 if (!*found_textrel) return NULL;
484
485 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
486 text_void = elf_findsecbyname(elf, ".text");
487
488 if (symtab_void && strtab_void && text_void && elf->shdr) {
489 #define SHOW_TEXTRELS(B) \
490 if (elf->elf_class == ELFCLASS ## B) { \
491 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
492 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
493 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
494 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
495 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
496 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
497 uint ## B ## _t memsz = EGET(text->sh_size); \
498 Elf ## B ## _Rel *rel; \
499 Elf ## B ## _Rela *rela; \
500 /* search the section headers for relocations */ \
501 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
502 uint32_t sh_type = EGET(shdr[s].sh_type); \
503 if (sh_type == SHT_REL) { \
504 rel = REL ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
505 rela = NULL; \
506 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
507 } else if (sh_type == SHT_RELA) { \
508 rel = NULL; \
509 rela = RELA ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
510 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
511 } else \
512 continue; \
513 /* now see if any of the relocs are in the .text */ \
514 for (r = 0; r < rmax; ++r) { \
515 unsigned long sym_max; \
516 Elf ## B ## _Addr offset_tmp; \
517 Elf ## B ## _Sym *func; \
518 Elf ## B ## _Sym *sym; \
519 Elf ## B ## _Addr r_offset; \
520 uint ## B ## _t r_info; \
521 if (sh_type == SHT_REL) { \
522 r_offset = EGET(rel[r].r_offset); \
523 r_info = EGET(rel[r].r_info); \
524 } else { \
525 r_offset = EGET(rela[r].r_offset); \
526 r_info = EGET(rela[r].r_info); \
527 } \
528 /* make sure this relocation is inside of the .text */ \
529 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
530 if (be_verbose <= 2) continue; \
531 } else \
532 *found_textrels = 1; \
533 /* locate this relocation symbol name */ \
534 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
535 if ((void*)sym > elf->data_end) { \
536 warn("%s: corrupt ELF symbol", elf->filename); \
537 continue; \
538 } \
539 sym_max = ELF ## B ## _R_SYM(r_info); \
540 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
541 sym += sym_max; \
542 else \
543 sym = NULL; \
544 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
545 /* show the raw details about this reloc */ \
546 printf(" %s: ", elf->base_filename); \
547 if (sym && sym->st_name) \
548 printf("%s", elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
549 else \
550 printf("(memory/data?)"); \
551 printf(" [0x%lX]", (unsigned long)r_offset); \
552 /* now try to find the closest symbol that this rel is probably in */ \
553 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
554 func = NULL; \
555 offset_tmp = 0; \
556 while (sym_max--) { \
557 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
558 func = sym; \
559 offset_tmp = EGET(sym->st_value); \
560 } \
561 ++sym; \
562 } \
563 printf(" in "); \
564 if (func && func->st_name) { \
565 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
566 if (r_offset > EGET(func->st_size)) \
567 printf("(optimized out: previous %s)", func_name); \
568 else \
569 printf("%s", func_name); \
570 } else \
571 printf("(optimized out)"); \
572 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
573 if (be_verbose && has_objdump) { \
574 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
575 char *sysbuf; \
576 size_t syslen; \
577 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"; \
578 syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
579 sysbuf = xmalloc(syslen); \
580 if (end_addr < r_offset) \
581 /* not uncommon when things are optimized out */ \
582 end_addr = r_offset + 0x100; \
583 snprintf(sysbuf, syslen, sysfmt, \
584 (unsigned long)offset_tmp, \
585 (unsigned long)end_addr, \
586 elf->filename, \
587 (unsigned long)r_offset); \
588 fflush(stdout); \
589 if (system(sysbuf)) {/* don't care */} \
590 fflush(stdout); \
591 free(sysbuf); \
592 } \
593 } \
594 } }
595 SHOW_TEXTRELS(32)
596 SHOW_TEXTRELS(64)
597 }
598 if (!*found_textrels)
599 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
600
601 return NULL;
602 }
603
604 static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
605 {
606 struct stat st;
607 switch (*item) {
608 case '/': break;
609 case '.':
610 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
611 break;
612 case ':':
613 case '\0':
614 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
615 break;
616 case '$':
617 if (fstat(elf->fd, &st) != -1)
618 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
619 warnf("Security problem with %s='%s' in %s with mode set of %o",
620 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
621 break;
622 default:
623 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
624 break;
625 }
626 }
627 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
628 {
629 unsigned long i;
630 char *rpath, *runpath, **r;
631 void *strtbl_void;
632
633 if (!show_rpath) return;
634
635 strtbl_void = elf_findsecbyname(elf, ".dynstr");
636 rpath = runpath = NULL;
637
638 if (elf->phdr && strtbl_void) {
639 #define SHOW_RPATH(B) \
640 if (elf->elf_class == ELFCLASS ## B) { \
641 Elf ## B ## _Dyn *dyn; \
642 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
643 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
644 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
645 Elf ## B ## _Off offset; \
646 Elf ## B ## _Xword word; \
647 /* Scan all the program headers */ \
648 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
649 /* Just scan dynamic headers */ \
650 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
651 offset = EGET(phdr[i].p_offset); \
652 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
653 /* Just scan dynamic RPATH/RUNPATH headers */ \
654 dyn = DYN ## B (elf->vdata + offset); \
655 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
656 if (word == DT_RPATH) { \
657 r = &rpath; \
658 } else if (word == DT_RUNPATH) { \
659 r = &runpath; \
660 } else { \
661 ++dyn; \
662 continue; \
663 } \
664 /* Verify the memory is somewhat sane */ \
665 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
666 if (offset < (Elf ## B ## _Off)elf->len) { \
667 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
668 *r = elf->data + offset; \
669 /* cache the length in case we need to nuke this section later on */ \
670 if (fix_elf) \
671 offset = strlen(*r); \
672 /* If quiet, don't output paths in ld.so.conf */ \
673 if (be_quiet) { \
674 size_t len; \
675 char *start, *end; \
676 /* note that we only 'chop' off leading known paths. */ \
677 /* since *r is read-only memory, we can only move the ptr forward. */ \
678 start = *r; \
679 /* scan each path in : delimited list */ \
680 while (start) { \
681 rpath_security_checks(elf, start, get_elfdtype(word)); \
682 end = strchr(start, ':'); \
683 len = (end ? abs(end - start) : strlen(start)); \
684 if (use_ldcache) { \
685 size_t n; \
686 const char *ldpath; \
687 array_for_each(ldpaths, n, ldpath) \
688 if (!strncmp(ldpath, start, len) && !ldpath[len]) { \
689 *r = end; \
690 /* corner case ... if RPATH reads "/usr/lib:", we want \
691 * to show ':' rather than '' */ \
692 if (end && end[1] != '\0') \
693 (*r)++; \
694 break; \
695 } \
696 } \
697 if (!*r || !end) \
698 break; \
699 else \
700 start = start + len + 1; \
701 } \
702 } \
703 if (*r) { \
704 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
705 /* just nuke it */ \
706 nuke_it##B: \
707 memset(*r, 0x00, offset); \
708 *r = NULL; \
709 ESET(dyn->d_tag, DT_DEBUG); \
710 ESET(dyn->d_un.d_ptr, 0); \
711 } else if (fix_elf) { \
712 /* try to clean "bad" paths */ \
713 size_t len, tmpdir_len; \
714 char *start, *end; \
715 const char *tmpdir; \
716 start = *r; \
717 tmpdir = (getenv("TMPDIR") ? : "."); \
718 tmpdir_len = strlen(tmpdir); \
719 while (1) { \
720 end = strchr(start, ':'); \
721 if (start == end) { \
722 eat_this_path##B: \
723 len = strlen(end); \
724 memmove(start, end+1, len); \
725 start[len-1] = '\0'; \
726 end = start - 1; \
727 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
728 if (!end) { \
729 if (start == *r) \
730 goto nuke_it##B; \
731 *--start = '\0'; \
732 } else \
733 goto eat_this_path##B; \
734 } \
735 if (!end) \
736 break; \
737 start = end + 1; \
738 } \
739 if (**r == '\0') \
740 goto nuke_it##B; \
741 } \
742 if (*r) \
743 *found_rpath = 1; \
744 } \
745 } \
746 ++dyn; \
747 } \
748 } }
749 SHOW_RPATH(32)
750 SHOW_RPATH(64)
751 }
752
753 if (be_wewy_wewy_quiet) return;
754
755 if (rpath && runpath) {
756 if (!strcmp(rpath, runpath)) {
757 xstrcat(ret, runpath, ret_len);
758 } else {
759 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
760 xchrcat(ret, '{', ret_len);
761 xstrcat(ret, rpath, ret_len);
762 xchrcat(ret, ',', ret_len);
763 xstrcat(ret, runpath, ret_len);
764 xchrcat(ret, '}', ret_len);
765 }
766 } else if (rpath || runpath)
767 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
768 else if (!be_quiet)
769 xstrcat(ret, " - ", ret_len);
770 }
771
772 /* Defines can be seen in glibc's sysdeps/generic/ldconfig.h */
773 #define LDSO_CACHE_MAGIC "ld.so-"
774 #define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
775 #define LDSO_CACHE_VER "1.7.0"
776 #define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
777 #define FLAG_ANY -1
778 #define FLAG_TYPE_MASK 0x00ff
779 #define FLAG_LIBC4 0x0000
780 #define FLAG_ELF 0x0001
781 #define FLAG_ELF_LIBC5 0x0002
782 #define FLAG_ELF_LIBC6 0x0003
783 #define FLAG_REQUIRED_MASK 0xff00
784 #define FLAG_SPARC_LIB64 0x0100
785 #define FLAG_IA64_LIB64 0x0200
786 #define FLAG_X8664_LIB64 0x0300
787 #define FLAG_S390_LIB64 0x0400
788 #define FLAG_POWERPC_LIB64 0x0500
789 #define FLAG_MIPS64_LIBN32 0x0600
790 #define FLAG_MIPS64_LIBN64 0x0700
791 #define FLAG_X8664_LIBX32 0x0800
792 #define FLAG_ARM_LIBHF 0x0900
793 #define FLAG_AARCH64_LIB64 0x0a00
794
795 #if defined(__GLIBC__) || defined(__UCLIBC__)
796
797 static char *lookup_cache_lib(elfobj *elf, const char *fname)
798 {
799 int fd;
800 char *strs;
801 static char buf[__PAX_UTILS_PATH_MAX] = "";
802 const char *cachefile = root_rel_path("/etc/ld.so.cache");
803 struct stat st;
804
805 typedef struct {
806 char magic[LDSO_CACHE_MAGIC_LEN];
807 char version[LDSO_CACHE_VER_LEN];
808 int nlibs;
809 } header_t;
810 header_t *header;
811
812 typedef struct {
813 int flags;
814 int sooffset;
815 int liboffset;
816 } libentry_t;
817 libentry_t *libent;
818
819 if (fname == NULL)
820 return NULL;
821
822 if (ldcache == NULL) {
823 if (fstatat(root_fd, cachefile, &st, 0))
824 return NULL;
825
826 fd = openat(root_fd, cachefile, O_RDONLY);
827 if (fd == -1)
828 return NULL;
829
830 /* cache these values so we only map/unmap the cache file once */
831 ldcache_size = st.st_size;
832 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
833 close(fd);
834
835 if (ldcache == MAP_FAILED) {
836 ldcache = NULL;
837 return NULL;
838 }
839
840 if (memcmp(header->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN) ||
841 memcmp(header->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
842 {
843 munmap(ldcache, ldcache_size);
844 ldcache = NULL;
845 return NULL;
846 }
847 } else
848 header = ldcache;
849
850 libent = ldcache + sizeof(header_t);
851 strs = (char *) &libent[header->nlibs];
852
853 for (fd = 0; fd < header->nlibs; ++fd) {
854 /* This should be more fine grained, but for now we assume that
855 * diff arches will not be cached together, and we ignore the
856 * the different multilib mips cases.
857 */
858 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
859 continue;
860 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
861 continue;
862
863 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
864 continue;
865
866 /* Return first hit because that is how the ldso rolls */
867 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
868 break;
869 }
870
871 return buf;
872 }
873
874 #elif defined(__NetBSD__)
875 static char *lookup_cache_lib(elfobj *elf, const char *fname)
876 {
877 static char buf[__PAX_UTILS_PATH_MAX] = "";
878 static struct stat st;
879 size_t n;
880 char *ldpath;
881
882 array_for_each(ldpath, n, ldpath) {
883 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", ldpath, fname) >= sizeof(buf))
884 continue; /* if the pathname is too long, or something went wrong, ignore */
885
886 if (stat(buf, &st) != 0)
887 continue; /* if the lib doesn't exist in *ldpath, look further */
888
889 /* NetBSD doesn't actually do sanity checks, it just loads the file
890 * and if that doesn't work, continues looking in other directories.
891 * This cannot easily be safely emulated, unfortunately. For now,
892 * just assume that if it exists, it's a valid library. */
893
894 return buf;
895 }
896
897 /* not found in any path */
898 return NULL;
899 }
900 #else
901 #ifdef __ELF__
902 #warning Cache support not implemented for your target
903 #endif
904 static char *lookup_cache_lib(elfobj *elf, const char *fname)
905 {
906 return NULL;
907 }
908 #endif
909
910 static char *lookup_config_lib(const char *fname)
911 {
912 static char buf[__PAX_UTILS_PATH_MAX] = "";
913 const char *ldpath;
914 size_t n;
915
916 array_for_each(ldpaths, n, ldpath) {
917 snprintf(buf, sizeof(buf), "%s/%s", root_rel_path(ldpath), fname);
918 if (faccessat(root_fd, buf, F_OK, AT_SYMLINK_NOFOLLOW) == 0)
919 return buf;
920 }
921
922 return NULL;
923 }
924
925 static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
926 {
927 unsigned long i;
928 char *needed;
929 void *strtbl_void;
930 char *p;
931
932 /*
933 * -n -> op==0 -> print all
934 * -N -> op==1 -> print requested
935 */
936 if ((op == 0 && !show_needed) || (op == 1 && !find_lib))
937 return NULL;
938
939 strtbl_void = elf_findsecbyname(elf, ".dynstr");
940
941 if (elf->phdr && strtbl_void) {
942 #define SHOW_NEEDED(B) \
943 if (elf->elf_class == ELFCLASS ## B) { \
944 Elf ## B ## _Dyn *dyn; \
945 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
946 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
947 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
948 Elf ## B ## _Off offset; \
949 size_t matched = 0; \
950 /* Walk all the program headers to find the PT_DYNAMIC */ \
951 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
952 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) \
953 continue; \
954 offset = EGET(phdr[i].p_offset); \
955 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
956 continue; \
957 /* Walk all the dynamic tags to find NEEDED entries */ \
958 dyn = DYN ## B (elf->vdata + offset); \
959 while (EGET(dyn->d_tag) != DT_NULL) { \
960 if (EGET(dyn->d_tag) == DT_NEEDED) { \
961 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
962 if (offset >= (Elf ## B ## _Off)elf->len) { \
963 ++dyn; \
964 continue; \
965 } \
966 needed = elf->data + offset; \
967 if (op == 0) { \
968 /* -n -> print all entries */ \
969 if (!be_wewy_wewy_quiet) { \
970 if (*found_needed) xchrcat(ret, ',', ret_len); \
971 if (use_ldpath) { \
972 if ((p = lookup_config_lib(needed)) != NULL) \
973 needed = p; \
974 } else if (use_ldcache) { \
975 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
976 needed = p; \
977 } \
978 xstrcat(ret, needed, ret_len); \
979 } \
980 *found_needed = 1; \
981 } else { \
982 /* -N -> print matching entries */ \
983 size_t n; \
984 const char *find_lib_name; \
985 \
986 array_for_each(find_lib_arr, n, find_lib_name) { \
987 int invert = 1; \
988 if (find_lib_name[0] == '!') \
989 invert = 0, ++find_lib_name; \
990 if (!strcmp(find_lib_name, needed) == invert) \
991 ++matched; \
992 } \
993 \
994 if (matched == array_cnt(find_lib_arr)) { \
995 *found_lib = 1; \
996 return (be_wewy_wewy_quiet ? NULL : find_lib); \
997 } \
998 } \
999 } \
1000 ++dyn; \
1001 } \
1002 } }
1003 SHOW_NEEDED(32)
1004 SHOW_NEEDED(64)
1005 if (op == 0 && !*found_needed && be_verbose)
1006 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
1007 }
1008
1009 return NULL;
1010 }
1011 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
1012 {
1013 void *strtbl_void;
1014
1015 if (!show_interp) return NULL;
1016
1017 strtbl_void = elf_findsecbyname(elf, ".interp");
1018
1019 if (strtbl_void) {
1020 #define SHOW_INTERP(B) \
1021 if (elf->elf_class == ELFCLASS ## B) { \
1022 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
1023 *found_interp = 1; \
1024 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
1025 }
1026 SHOW_INTERP(32)
1027 SHOW_INTERP(64)
1028 } else {
1029 /* Walk all the program headers to find the PT_INTERP */
1030 #define SHOW_PT_INTERP(B) \
1031 if (elf->elf_class == ELFCLASS ## B) { \
1032 unsigned long i; \
1033 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1034 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1035 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1036 if (EGET(phdr[i].p_type) != PT_INTERP) \
1037 continue; \
1038 *found_interp = 1; \
1039 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(phdr[i].p_offset)); \
1040 } \
1041 }
1042 SHOW_PT_INTERP(32)
1043 SHOW_PT_INTERP(64)
1044 }
1045
1046 return NULL;
1047 }
1048 static const char *scanelf_file_bind(elfobj *elf, char *found_bind)
1049 {
1050 unsigned long i;
1051 struct stat s;
1052 bool dynamic = false;
1053
1054 if (!show_bind) return NULL;
1055 if (!elf->phdr) return NULL;
1056
1057 #define SHOW_BIND(B) \
1058 if (elf->elf_class == ELFCLASS ## B) { \
1059 Elf ## B ## _Dyn *dyn; \
1060 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1061 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1062 Elf ## B ## _Off offset; \
1063 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1064 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1065 dynamic = true; \
1066 offset = EGET(phdr[i].p_offset); \
1067 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
1068 dyn = DYN ## B (elf->vdata + offset); \
1069 while (EGET(dyn->d_tag) != DT_NULL) { \
1070 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
1071 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
1072 { \
1073 if (be_quiet) return NULL; \
1074 *found_bind = 1; \
1075 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
1076 } \
1077 ++dyn; \
1078 } \
1079 } \
1080 }
1081 SHOW_BIND(32)
1082 SHOW_BIND(64)
1083
1084 if (be_wewy_wewy_quiet) return NULL;
1085
1086 /* don't output anything if quiet mode and the ELF is static or not setuid */
1087 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
1088 return NULL;
1089 } else {
1090 *found_bind = 1;
1091 return dynamic ? "LAZY" : "STATIC";
1092 }
1093 }
1094 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
1095 {
1096 unsigned long i;
1097 char *soname;
1098 void *strtbl_void;
1099
1100 if (!show_soname) return NULL;
1101
1102 strtbl_void = elf_findsecbyname(elf, ".dynstr");
1103
1104 if (elf->phdr && strtbl_void) {
1105 #define SHOW_SONAME(B) \
1106 if (elf->elf_class == ELFCLASS ## B) { \
1107 Elf ## B ## _Dyn *dyn; \
1108 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1109 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1110 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
1111 Elf ## B ## _Off offset; \
1112 /* only look for soname in shared objects */ \
1113 if (EGET(ehdr->e_type) != ET_DYN) \
1114 return NULL; \
1115 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1116 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1117 offset = EGET(phdr[i].p_offset); \
1118 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
1119 dyn = DYN ## B (elf->vdata + offset); \
1120 while (EGET(dyn->d_tag) != DT_NULL) { \
1121 if (EGET(dyn->d_tag) == DT_SONAME) { \
1122 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
1123 if (offset >= (Elf ## B ## _Off)elf->len) { \
1124 ++dyn; \
1125 continue; \
1126 } \
1127 soname = elf->data + offset; \
1128 *found_soname = 1; \
1129 return (be_wewy_wewy_quiet ? NULL : soname); \
1130 } \
1131 ++dyn; \
1132 } \
1133 } }
1134 SHOW_SONAME(32)
1135 SHOW_SONAME(64)
1136 }
1137
1138 return NULL;
1139 }
1140
1141 /*
1142 * We support the symbol form:
1143 * [%[modifiers]%][[+-]<symbol name>][,[.....]]
1144 * If the symbol name is empty, then all symbols are matched.
1145 * If the symbol name is a glob ("*"), then all symbols are dumped (debug).
1146 * Do not rely on this output format at all.
1147 * Otherwise the symbol name is used to search (either regex or string compare).
1148 * If the first char of the symbol name is a plus ("+"), then only match
1149 * defined symbols. If it's a minus ("-"), only match undefined symbols.
1150 * Putting modifiers in between the percent signs allows for more in depth
1151 * filters. There are groups of modifiers. If you don't specify a member
1152 * of a group, then all types in that group are matched. The current
1153 * groups and their types are:
1154 * STT group: STT_NOTYPE:n STT_OBJECT:o STT_FUNC:f STT_FILE:F
1155 * STB group: STB_LOCAL:l STB_GLOBAL:g STB_WEAK:w
1156 * SHN group: SHN_UNDEF:u SHN_ABS:a SHN_COMMON:c {defined}:d
1157 * The "defined" value in the SHN group does not correspond to a SHN_xxx define.
1158 * You can search for multiple symbols at once by seperating with a comma (",").
1159 *
1160 * Some examples:
1161 * ELFs with a weak function "foo":
1162 * scanelf -s %wf%foo <ELFs>
1163 * ELFs that define the symbol "main":
1164 * scanelf -s +main <ELFs>
1165 * scanelf -s %d%main <ELFs>
1166 * ELFs that refer to the undefined symbol "brk":
1167 * scanelf -s -brk <ELFs>
1168 * scanelf -s %u%brk <ELFs>
1169 * All global defined objects in an ELF:
1170 * scanelf -s %ogd% <ELF>
1171 */
1172 static void
1173 scanelf_match_symname(elfobj *elf, char *found_sym, char **ret, size_t *ret_len, const char *symname,
1174 unsigned int stt, unsigned int stb, unsigned int shn, unsigned long size)
1175 {
1176 const char *this_sym;
1177 size_t n;
1178
1179 array_for_each(find_sym_arr, n, this_sym) {
1180 bool inc_notype, inc_object, inc_func, inc_file,
1181 inc_local, inc_global, inc_weak,
1182 inc_def, inc_undef, inc_abs, inc_common;
1183
1184 /* symbol selection! */
1185 inc_notype = inc_object = inc_func = inc_file = \
1186 inc_local = inc_global = inc_weak = \
1187 inc_def = inc_undef = inc_abs = inc_common = \
1188 (*this_sym != '%');
1189
1190 /* parse the contents of %...% */
1191 if (!inc_notype) {
1192 while (*(this_sym++)) {
1193 if (*this_sym == '%') {
1194 ++this_sym;
1195 break;
1196 }
1197 switch (*this_sym) {
1198 case 'n': inc_notype = true; break;
1199 case 'o': inc_object = true; break;
1200 case 'f': inc_func = true; break;
1201 case 'F': inc_file = true; break;
1202 case 'l': inc_local = true; break;
1203 case 'g': inc_global = true; break;
1204 case 'w': inc_weak = true; break;
1205 case 'd': inc_def = true; break;
1206 case 'u': inc_undef = true; break;
1207 case 'a': inc_abs = true; break;
1208 case 'c': inc_common = true; break;
1209 default: err("invalid symbol selector '%c'", *this_sym);
1210 }
1211 }
1212
1213 /* If no types are matched, not match all */
1214 if (!inc_notype && !inc_object && !inc_func && !inc_file)
1215 inc_notype = inc_object = inc_func = inc_file = true;
1216 if (!inc_local && !inc_global && !inc_weak)
1217 inc_local = inc_global = inc_weak = true;
1218 if (!inc_def && !inc_undef && !inc_abs && !inc_common)
1219 inc_def = inc_undef = inc_abs = inc_common = true;
1220
1221 /* backwards compat for defined/undefined short hand */
1222 } else if (*this_sym == '+') {
1223 inc_undef = false;
1224 ++this_sym;
1225 } else if (*this_sym == '-') {
1226 inc_def = inc_abs = inc_common = false;
1227 ++this_sym;
1228 }
1229
1230 /* filter symbols */
1231 if ((!inc_notype && stt == STT_NOTYPE) || \
1232 (!inc_object && stt == STT_OBJECT) || \
1233 (!inc_func && stt == STT_FUNC ) || \
1234 (!inc_file && stt == STT_FILE ) || \
1235 (!inc_local && stb == STB_LOCAL ) || \
1236 (!inc_global && stb == STB_GLOBAL) || \
1237 (!inc_weak && stb == STB_WEAK ) || \
1238 (!inc_def && shn && shn < SHN_LORESERVE) || \
1239 (!inc_undef && shn == SHN_UNDEF ) || \
1240 (!inc_abs && shn == SHN_ABS ) || \
1241 (!inc_common && shn == SHN_COMMON))
1242 continue;
1243
1244 if (*this_sym == '*') {
1245 /* a "*" symbol gets you debug output */
1246 printf("%s(%s) %5lX %15s %15s %15s %s\n",
1247 ((*found_sym == 0) ? "\n\t" : "\t"),
1248 elf->base_filename,
1249 size,
1250 get_elfstttype(stt),
1251 get_elfstbtype(stb),
1252 get_elfshntype(shn),
1253 symname);
1254 goto matched;
1255
1256 } else {
1257 if (g_match) {
1258 /* regex match the symbol */
1259 if (regexec(find_sym_regex_arr->eles[n], symname, 0, NULL, 0) == REG_NOMATCH)
1260 continue;
1261
1262 } else if (*this_sym) {
1263 /* give empty symbols a "pass", else do a normal compare */
1264 const size_t len = strlen(this_sym);
1265 if (!(strncmp(this_sym, symname, len) == 0 &&
1266 /* Accept unversioned symbol names */
1267 (symname[len] == '\0' || symname[len] == '@')))
1268 continue;
1269 }
1270
1271 if (be_semi_verbose) {
1272 char buf[1024];
1273 snprintf(buf, sizeof(buf), "%lX %s %s",
1274 size,
1275 get_elfstttype(stt),
1276 this_sym);
1277 *ret = xstrdup(buf);
1278 } else {
1279 if (*ret) xchrcat(ret, ',', ret_len);
1280 xstrcat(ret, symname, ret_len);
1281 }
1282
1283 goto matched;
1284 }
1285 }
1286
1287 return;
1288
1289 matched:
1290 *found_sym = 1;
1291 }
1292
1293 static const char *scanelf_file_sym(elfobj *elf, char *found_sym)
1294 {
1295 char *ret;
1296 void *symtab_void, *strtab_void;
1297
1298 if (!find_sym) return NULL;
1299 ret = NULL;
1300
1301 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
1302
1303 if (symtab_void && strtab_void) {
1304 #define FIND_SYM(B) \
1305 if (elf->elf_class == ELFCLASS ## B) { \
1306 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
1307 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
1308 Elf ## B ## _Sym *sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
1309 Elf ## B ## _Word i, cnt = EGET(symtab->sh_entsize); \
1310 char *symname; \
1311 size_t ret_len = 0; \
1312 if (cnt) \
1313 cnt = EGET(symtab->sh_size) / cnt; \
1314 for (i = 0; i < cnt; ++i) { \
1315 if ((void*)sym > elf->data_end) { \
1316 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1317 goto break_out; \
1318 } \
1319 if (sym->st_name) { \
1320 /* make sure the symbol name is in acceptable memory range */ \
1321 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
1322 if ((void*)symname > elf->data_end) { \
1323 warnf("%s: corrupt ELF symbols", elf->filename); \
1324 ++sym; \
1325 continue; \
1326 } \
1327 scanelf_match_symname(elf, found_sym, \
1328 &ret, &ret_len, symname, \
1329 ELF##B##_ST_TYPE(EGET(sym->st_info)), \
1330 ELF##B##_ST_BIND(EGET(sym->st_info)), \
1331 EGET(sym->st_shndx), \
1332 /* st_size can be 64bit, but no one is really that big, so screw em */ \
1333 EGET(sym->st_size)); \
1334 } \
1335 ++sym; \
1336 } \
1337 }
1338 FIND_SYM(32)
1339 FIND_SYM(64)
1340 }
1341
1342 break_out:
1343 if (be_wewy_wewy_quiet) return NULL;
1344
1345 if (*find_sym != '*' && *found_sym)
1346 return ret;
1347 if (be_quiet)
1348 return NULL;
1349 else
1350 return " - ";
1351 }
1352
1353 static const char *scanelf_file_sections(elfobj *elf, char *found_section)
1354 {
1355 if (!find_section)
1356 return NULL;
1357
1358 #define FIND_SECTION(B) \
1359 if (elf->elf_class == ELFCLASS ## B) { \
1360 size_t matched, n; \
1361 int invert; \
1362 const char *section_name; \
1363 Elf ## B ## _Shdr *section; \
1364 \
1365 matched = 0; \
1366 array_for_each(find_section_arr, n, section_name) { \
1367 invert = (*section_name == '!' ? 1 : 0); \
1368 section = SHDR ## B (elf_findsecbyname(elf, section_name + invert)); \
1369 if ((section == NULL && invert) || (section != NULL && !invert)) \
1370 ++matched; \
1371 } \
1372 \
1373 if (matched == array_cnt(find_section_arr)) \
1374 *found_section = 1; \
1375 }
1376 FIND_SECTION(32)
1377 FIND_SECTION(64)
1378
1379 if (be_wewy_wewy_quiet)
1380 return NULL;
1381
1382 if (*found_section)
1383 return find_section;
1384
1385 if (be_quiet)
1386 return NULL;
1387 else
1388 return " - ";
1389 }
1390
1391 /* scan an elf file and show all the fun stuff */
1392 #define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
1393 static int scanelf_elfobj(elfobj *elf)
1394 {
1395 unsigned long i;
1396 char found_pax, found_phdr, found_relro, found_load, found_textrel,
1397 found_rpath, found_needed, found_interp, found_bind, found_soname,
1398 found_sym, found_lib, found_file, found_textrels, found_section;
1399 static char *out_buffer = NULL;
1400 static size_t out_len;
1401
1402 found_pax = found_phdr = found_relro = found_load = found_textrel = \
1403 found_rpath = found_needed = found_interp = found_bind = found_soname = \
1404 found_sym = found_lib = found_file = found_textrels = found_section = 0;
1405
1406 if (be_verbose > 2)
1407 printf("%s: scanning file {%s,%s}\n", elf->filename,
1408 get_elfeitype(EI_CLASS, elf->elf_class),
1409 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
1410 else if (be_verbose > 1)
1411 printf("%s: scanning file\n", elf->filename);
1412
1413 /* init output buffer */
1414 if (!out_buffer) {
1415 out_len = sizeof(char) * 80;
1416 out_buffer = xmalloc(out_len);
1417 }
1418 *out_buffer = '\0';
1419
1420 /* show the header */
1421 if (!be_quiet && show_banner) {
1422 for (i = 0; out_format[i]; ++i) {
1423 if (!IS_MODIFIER(out_format[i])) continue;
1424
1425 switch (out_format[++i]) {
1426 case '+': break;
1427 case '%': break;
1428 case '#': break;
1429 case 'F':
1430 case 'p':
1431 case 'f': prints("FILE "); found_file = 1; break;
1432 case 'o': prints(" TYPE "); break;
1433 case 'x': prints(" PAX "); break;
1434 case 'e': prints("STK/REL/PTL "); break;
1435 case 't': prints("TEXTREL "); break;
1436 case 'r': prints("RPATH "); break;
1437 case 'M': prints("CLASS "); break;
1438 case 'l':
1439 case 'n': prints("NEEDED "); break;
1440 case 'i': prints("INTERP "); break;
1441 case 'b': prints("BIND "); break;
1442 case 'Z': prints("SIZE "); break;
1443 case 'S': prints("SONAME "); break;
1444 case 's': prints("SYM "); break;
1445 case 'N': prints("LIB "); break;
1446 case 'T': prints("TEXTRELS "); break;
1447 case 'k': prints("SECTION "); break;
1448 case 'a': prints("ARCH "); break;
1449 case 'I': prints("OSABI "); break;
1450 case 'Y': prints("EABI "); break;
1451 case 'O': prints("PERM "); break;
1452 case 'D': prints("ENDIAN "); break;
1453 default: warnf("'%c' has no title ?", out_format[i]);
1454 }
1455 }
1456 if (!found_file) prints("FILE ");
1457 prints("\n");
1458 found_file = 0;
1459 show_banner = 0;
1460 }
1461
1462 /* dump all the good stuff */
1463 for (i = 0; out_format[i]; ++i) {
1464 const char *out;
1465 const char *tmp;
1466 static char ubuf[sizeof(unsigned long)*2];
1467 if (!IS_MODIFIER(out_format[i])) {
1468 xchrcat(&out_buffer, out_format[i], &out_len);
1469 continue;
1470 }
1471
1472 out = NULL;
1473 be_wewy_wewy_quiet = (out_format[i] == '#');
1474 be_semi_verbose = (out_format[i] == '+');
1475 switch (out_format[++i]) {
1476 case '+':
1477 case '%':
1478 case '#':
1479 xchrcat(&out_buffer, out_format[i], &out_len); break;
1480 case 'F':
1481 found_file = 1;
1482 if (be_wewy_wewy_quiet) break;
1483 xstrcat(&out_buffer, elf->filename, &out_len);
1484 break;
1485 case 'p':
1486 found_file = 1;
1487 if (be_wewy_wewy_quiet) break;
1488 tmp = elf->filename;
1489 if (search_path) {
1490 ssize_t len_search = strlen(search_path);
1491 ssize_t len_file = strlen(elf->filename);
1492 if (!strncmp(elf->filename, search_path, len_search) && \
1493 len_file > len_search)
1494 tmp += len_search;
1495 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1496 }
1497 xstrcat(&out_buffer, tmp, &out_len);
1498 break;
1499 case 'f':
1500 found_file = 1;
1501 if (be_wewy_wewy_quiet) break;
1502 tmp = strrchr(elf->filename, '/');
1503 tmp = (tmp == NULL ? elf->filename : tmp+1);
1504 xstrcat(&out_buffer, tmp, &out_len);
1505 break;
1506 case 'o': out = get_elfetype(elf); break;
1507 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
1508 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
1509 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1510 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
1511 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1512 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1513 case 'D': out = get_endian(elf); break;
1514 case 'O': out = strfileperms(elf->filename); break;
1515 case 'n':
1516 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
1517 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1518 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1519 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
1520 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1521 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1522 case 'a': out = get_elfemtype(elf); break;
1523 case 'I': out = get_elfosabi(elf); break;
1524 case 'Y': out = get_elf_eabi(elf); break;
1525 case 'Z': snprintf(ubuf, sizeof(ubuf), "%lu", (unsigned long)elf->len); out = ubuf; break;;
1526 default: warnf("'%c' has no scan code?", out_format[i]);
1527 }
1528 if (out)
1529 xstrcat(&out_buffer, out, &out_len);
1530 }
1531
1532 #define FOUND_SOMETHING() \
1533 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1534 found_rpath || found_needed || found_interp || found_bind || \
1535 found_soname || found_sym || found_lib || found_textrels || found_section )
1536
1537 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1538 xchrcat(&out_buffer, ' ', &out_len);
1539 xstrcat(&out_buffer, elf->filename, &out_len);
1540 }
1541 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
1542 puts(out_buffer);
1543 fflush(stdout);
1544 }
1545
1546 return 0;
1547 }
1548
1549 /* scan a single elf */
1550 static int scanelf_elf(const char *filename, int fd, size_t len)
1551 {
1552 int ret = 1;
1553 elfobj *elf;
1554
1555 /* verify this is real ELF */
1556 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1557 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1558 return 2;
1559 }
1560 switch (match_bits) {
1561 case 32:
1562 if (elf->elf_class != ELFCLASS32)
1563 goto label_done;
1564 break;
1565 case 64:
1566 if (elf->elf_class != ELFCLASS64)
1567 goto label_done;
1568 break;
1569 default: break;
1570 }
1571 if (match_etypes) {
1572 char sbuf[126];
1573 strncpy(sbuf, match_etypes, sizeof(sbuf));
1574 if (strchr(match_etypes, ',') != NULL) {
1575 char *p;
1576 while ((p = strrchr(sbuf, ',')) != NULL) {
1577 *p = 0;
1578 if (etype_lookup(p+1) == get_etype(elf))
1579 goto label_ret;
1580 }
1581 }
1582 if (etype_lookup(sbuf) != get_etype(elf))
1583 goto label_done;
1584 }
1585
1586 label_ret:
1587 ret = scanelf_elfobj(elf);
1588
1589 label_done:
1590 unreadelf(elf);
1591 return ret;
1592 }
1593
1594 /* scan an archive of elfs */
1595 static int scanelf_archive(const char *filename, int fd, size_t len)
1596 {
1597 archive_handle *ar;
1598 archive_member *m;
1599 char *ar_buffer;
1600 elfobj *elf;
1601
1602 ar = ar_open_fd(filename, fd);
1603 if (ar == NULL)
1604 return 1;
1605
1606 ar_buffer = mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1607 while ((m = ar_next(ar)) != NULL) {
1608 off_t cur_pos = lseek(fd, 0, SEEK_CUR);
1609 if (cur_pos == -1)
1610 errp("lseek() failed");
1611 elf = readelf_buffer(m->name, ar_buffer + cur_pos, m->size);
1612 if (elf) {
1613 scanelf_elfobj(elf);
1614 unreadelf(elf);
1615 }
1616 }
1617 munmap(ar_buffer, len);
1618
1619 return 0;
1620 }
1621 /* scan a file which may be an elf or an archive or some other magical beast */
1622 static int scanelf_fileat(int dir_fd, const char *filename, const struct stat *st_cache)
1623 {
1624 const struct stat *st = st_cache;
1625 struct stat symlink_st;
1626 int fd;
1627
1628 /* always handle regular files and handle symlinked files if no -y */
1629 if (S_ISLNK(st->st_mode)) {
1630 if (!scan_symlink)
1631 return 1;
1632 fstatat(dir_fd, filename, &symlink_st, 0);
1633 st = &symlink_st;
1634 }
1635
1636 if (!S_ISREG(st->st_mode)) {
1637 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1638 return 1;
1639 }
1640
1641 if (match_perms) {
1642 if ((st->st_mode | match_perms) != st->st_mode)
1643 return 1;
1644 }
1645 fd = openat(dir_fd, filename, (fix_elf ? O_RDWR : O_RDONLY) | O_CLOEXEC);
1646 if (fd == -1) {
1647 if (fix_elf && errno == ETXTBSY)
1648 warnp("%s: could not fix", filename);
1649 else if (be_verbose > 2)
1650 printf("%s: skipping file: %s\n", filename, strerror(errno));
1651 return 1;
1652 }
1653
1654 if (scanelf_elf(filename, fd, st->st_size) == 2) {
1655 /* if it isn't an ELF, maybe it's an .a archive */
1656 if (scan_archives)
1657 scanelf_archive(filename, fd, st->st_size);
1658
1659 /*
1660 * unreadelf() implicitly closes its fd, so only close it
1661 * when we are returning it in the non-ELF case
1662 */
1663 close(fd);
1664 }
1665
1666 return 0;
1667 }
1668
1669 /* scan a directory for ET_EXEC files and print when we find one */
1670 static int scanelf_dirat(int dir_fd, const char *path)
1671 {
1672 register DIR *dir;
1673 register struct dirent *dentry;
1674 struct stat st_top, st;
1675 char buf[__PAX_UTILS_PATH_MAX], *subpath;
1676 size_t pathlen = 0, len = 0;
1677 int ret = 0;
1678 int subdir_fd;
1679
1680 /* make sure path exists */
1681 if (fstatat(dir_fd, path, &st_top, AT_SYMLINK_NOFOLLOW) == -1) {
1682 if (be_verbose > 2) printf("%s: does not exist\n", path);
1683 return 1;
1684 }
1685
1686 /* ok, if it isn't a directory, assume we can open it */
1687 if (!S_ISDIR(st_top.st_mode))
1688 return scanelf_fileat(dir_fd, path, &st_top);
1689
1690 /* now scan the dir looking for fun stuff */
1691 subdir_fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
1692 if (subdir_fd == -1)
1693 dir = NULL;
1694 else
1695 dir = fdopendir(subdir_fd);
1696 if (dir == NULL) {
1697 if (subdir_fd != -1)
1698 close(subdir_fd);
1699 else if (be_verbose > 2)
1700 printf("%s: skipping dir: %s\n", path, strerror(errno));
1701 return 1;
1702 }
1703 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1704
1705 subpath = stpcpy(buf, path);
1706 if (subpath[-1] != '/')
1707 *subpath++ = '/';
1708 pathlen = subpath - buf;
1709 while ((dentry = readdir(dir))) {
1710 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1711 continue;
1712
1713 if (fstatat(subdir_fd, dentry->d_name, &st, AT_SYMLINK_NOFOLLOW) == -1)
1714 continue;
1715
1716 len = strlen(dentry->d_name);
1717 if (len + pathlen + 1 >= sizeof(buf)) {
1718 warnf("Skipping '%s%s': len > sizeof(buf); %zu > %zu\n",
1719 path, dentry->d_name, len + pathlen + 1, sizeof(buf));
1720 continue;
1721 }
1722 memcpy(subpath, dentry->d_name, len);
1723 subpath[len] = '\0';
1724
1725 if (S_ISREG(st.st_mode))
1726 ret = scanelf_fileat(dir_fd, buf, &st);
1727 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1728 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1729 ret = scanelf_dirat(dir_fd, buf);
1730 }
1731 }
1732 closedir(dir);
1733
1734 return ret;
1735 }
1736 static int scanelf_dir(const char *path)
1737 {
1738 return scanelf_dirat(root_fd, root_rel_path(path));
1739 }
1740
1741 static int scanelf_from_file(const char *filename)
1742 {
1743 FILE *fp;
1744 char *p, *path;
1745 size_t len;
1746 int ret;
1747
1748 if (strcmp(filename, "-") == 0)
1749 fp = stdin;
1750 else if ((fp = fopen(filename, "r")) == NULL)
1751 return 1;
1752
1753 path = NULL;
1754 len = 0;
1755 ret = 0;
1756 while (getline(&path, &len, fp) != -1) {
1757 if ((p = strchr(path, '\n')) != NULL)
1758 *p = 0;
1759 search_path = path;
1760 ret = scanelf_dir(path);
1761 }
1762 free(path);
1763
1764 if (fp != stdin)
1765 fclose(fp);
1766
1767 return ret;
1768 }
1769
1770 #if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1771
1772 static int _load_ld_cache_config(const char *fname)
1773 {
1774 FILE *fp = NULL;
1775 char *p, *path;
1776 size_t len;
1777 int curr_fd = -1;
1778
1779 fp = fopenat_r(root_fd, root_rel_path(fname));
1780 if (fp == NULL)
1781 return -1;
1782
1783 path = NULL;
1784 len = 0;
1785 while (getline(&path, &len, fp) != -1) {
1786 if ((p = strrchr(path, '\r')) != NULL)
1787 *p = 0;
1788 if ((p = strchr(path, '\n')) != NULL)
1789 *p = 0;
1790
1791 /* recursive includes of the same file will make this segfault. */
1792 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1793 glob_t gl;
1794 size_t x;
1795 const char *gpath;
1796
1797 /* re-use existing path buffer ... need to be creative */
1798 if (path[8] != '/')
1799 gpath = memcpy(path + 3, "/etc/", 5);
1800 else
1801 gpath = path + 8;
1802 if (root_fd != AT_FDCWD) {
1803 if (curr_fd == -1) {
1804 curr_fd = open(".", O_RDONLY|O_CLOEXEC);
1805 if (fchdir(root_fd))
1806 errp("unable to change to root dir");
1807 }
1808 gpath = root_rel_path(gpath);
1809 }
1810
1811 if (glob(gpath, 0, NULL, &gl) == 0) {
1812 for (x = 0; x < gl.gl_pathc; ++x) {
1813 /* try to avoid direct loops */
1814 if (strcmp(gl.gl_pathv[x], fname) == 0)
1815 continue;
1816 _load_ld_cache_config(gl.gl_pathv[x]);
1817 }
1818 globfree(&gl);
1819 }
1820
1821 /* failed globs are ignored by glibc */
1822 continue;
1823 }
1824
1825 if (*path != '/')
1826 continue;
1827
1828 xarraypush_str(ldpaths, path);
1829 }
1830 free(path);
1831
1832 fclose(fp);
1833
1834 if (curr_fd != -1) {
1835 if (fchdir(curr_fd))
1836 {/* don't care */}
1837 close(curr_fd);
1838 }
1839
1840 return 0;
1841 }
1842
1843 #elif defined(__FreeBSD__) || defined(__DragonFly__)
1844
1845 static int _load_ld_cache_config(const char *fname)
1846 {
1847 FILE *fp = NULL;
1848 char *b = NULL, *p;
1849 struct elfhints_hdr hdr;
1850
1851 fp = fopenat_r(root_fd, root_rel_path(fname));
1852 if (fp == NULL)
1853 return -1;
1854
1855 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1856 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1857 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1858 {
1859 fclose(fp);
1860 return -1;
1861 }
1862
1863 b = xmalloc(hdr.dirlistlen + 1);
1864 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1865 fclose(fp);
1866 free(b);
1867 return -1;
1868 }
1869
1870 while ((p = strsep(&b, ":"))) {
1871 if (*p == '\0')
1872 continue;
1873 xarraypush_str(ldpaths, p);
1874 }
1875
1876 free(b);
1877 fclose(fp);
1878 return 0;
1879 }
1880
1881 #else
1882 #ifdef __ELF__
1883 #warning Cache config support not implemented for your target
1884 #endif
1885 static int _load_ld_cache_config(const char *fname)
1886 {
1887 return 0;
1888 }
1889 #endif
1890
1891 static void load_ld_cache_config(const char *fname)
1892 {
1893 bool scan_l, scan_ul, scan_ull;
1894 size_t n;
1895 const char *ldpath;
1896
1897 _load_ld_cache_config(fname);
1898
1899 scan_l = scan_ul = scan_ull = false;
1900 if (array_cnt(ldpaths)) {
1901 array_for_each(ldpaths, n, ldpath) {
1902 if (!scan_l && !strcmp(ldpath, "/lib")) scan_l = true;
1903 if (!scan_ul && !strcmp(ldpath, "/usr/lib")) scan_ul = true;
1904 if (!scan_ull && !strcmp(ldpath, "/usr/local/lib")) scan_ull = true;
1905 }
1906 }
1907
1908 if (!scan_l) xarraypush_str(ldpaths, "/lib");
1909 if (!scan_ul) xarraypush_str(ldpaths, "/usr/lib");
1910 if (!scan_ull) xarraypush_str(ldpaths, "/usr/local/lib");
1911 }
1912
1913 /* scan /etc/ld.so.conf for paths */
1914 static void scanelf_ldpath(void)
1915 {
1916 size_t n;
1917 const char *ldpath;
1918
1919 array_for_each(ldpaths, n, ldpath)
1920 scanelf_dir(ldpath);
1921 }
1922
1923 /* scan env PATH for paths */
1924 static void scanelf_envpath(void)
1925 {
1926 char *path, *p;
1927
1928 path = getenv("PATH");
1929 if (!path)
1930 err("PATH is not set in your env !");
1931 path = xstrdup(path);
1932
1933 while ((p = strrchr(path, ':')) != NULL) {
1934 scanelf_dir(p + 1);
1935 *p = 0;
1936 }
1937
1938 free(path);
1939 }
1940
1941 /* usage / invocation handling functions */ /* Free Flags: c d j u w G H J K P Q U W */
1942 #define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZCBhV"
1943 #define a_argument required_argument
1944 static struct option const long_opts[] = {
1945 {"path", no_argument, NULL, 'p'},
1946 {"ldpath", no_argument, NULL, 'l'},
1947 {"use-ldpath",no_argument, NULL, 129},
1948 {"root", a_argument, NULL, 128},
1949 {"recursive", no_argument, NULL, 'R'},
1950 {"mount", no_argument, NULL, 'm'},
1951 {"symlink", no_argument, NULL, 'y'},
1952 {"archives", no_argument, NULL, 'A'},
1953 {"ldcache", no_argument, NULL, 'L'},
1954 {"fix", no_argument, NULL, 'X'},
1955 {"setpax", a_argument, NULL, 'z'},
1956 {"pax", no_argument, NULL, 'x'},
1957 {"header", no_argument, NULL, 'e'},
1958 {"textrel", no_argument, NULL, 't'},
1959 {"rpath", no_argument, NULL, 'r'},
1960 {"needed", no_argument, NULL, 'n'},
1961 {"interp", no_argument, NULL, 'i'},
1962 {"bind", no_argument, NULL, 'b'},
1963 {"soname", no_argument, NULL, 'S'},
1964 {"symbol", a_argument, NULL, 's'},
1965 {"section", a_argument, NULL, 'k'},
1966 {"lib", a_argument, NULL, 'N'},
1967 {"gmatch", no_argument, NULL, 'g'},
1968 {"textrels", no_argument, NULL, 'T'},
1969 {"etype", a_argument, NULL, 'E'},
1970 {"bits", a_argument, NULL, 'M'},
1971 {"endian", no_argument, NULL, 'D'},
1972 {"osabi", no_argument, NULL, 'I'},
1973 {"eabi", no_argument, NULL, 'Y'},
1974 {"perms", a_argument, NULL, 'O'},
1975 {"size", no_argument, NULL, 'Z'},
1976 {"all", no_argument, NULL, 'a'},
1977 {"quiet", no_argument, NULL, 'q'},
1978 {"verbose", no_argument, NULL, 'v'},
1979 {"format", a_argument, NULL, 'F'},
1980 {"from", a_argument, NULL, 'f'},
1981 {"file", a_argument, NULL, 'o'},
1982 {"nocolor", no_argument, NULL, 'C'},
1983 {"nobanner", no_argument, NULL, 'B'},
1984 {"help", no_argument, NULL, 'h'},
1985 {"version", no_argument, NULL, 'V'},
1986 {NULL, no_argument, NULL, 0x0}
1987 };
1988
1989 static const char * const opts_help[] = {
1990 "Scan all directories in PATH environment",
1991 "Scan all directories in /etc/ld.so.conf",
1992 "Use ld.so.conf to show full path (use with -r/-n)",
1993 "Root directory (use with -l or -p)",
1994 "Scan directories recursively",
1995 "Don't recursively cross mount points",
1996 "Don't scan symlinks",
1997 "Scan archives (.a files)",
1998 "Utilize ld.so.cache to show full path (use with -r/-n)",
1999 "Try and 'fix' bad things (use with -r/-e)",
2000 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
2001 "Print PaX markings",
2002 "Print GNU_STACK/PT_LOAD markings",
2003 "Print TEXTREL information",
2004 "Print RPATH information",
2005 "Print NEEDED information",
2006 "Print INTERP information",
2007 "Print BIND information",
2008 "Print SONAME information",
2009 "Find a specified symbol",
2010 "Find a specified section",
2011 "Find a specified library",
2012 "Use regex rather than string compare (with -s); specify twice for case insensitive",
2013 "Locate cause of TEXTREL",
2014 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
2015 "Print only ELF files matching numeric bits",
2016 "Print Endianness",
2017 "Print OSABI",
2018 "Print EABI (EM_ARM Only)",
2019 "Print only ELF files matching octal permissions",
2020 "Print ELF file size",
2021 "Print all useful/simple info\n",
2022 "Only output 'bad' things",
2023 "Be verbose (can be specified more than once)",
2024 "Use specified format for output",
2025 "Read input stream from a filename",
2026 "Write output stream to a filename",
2027 "Don't emit color in output",
2028 "Don't display the header",
2029 "Print this help and exit",
2030 "Print version and exit",
2031 NULL
2032 };
2033
2034 /* display usage and exit */
2035 static void usage(int status)
2036 {
2037 const char a_arg[] = "<arg>";
2038 size_t a_arg_len = strlen(a_arg) + 2;
2039 size_t i;
2040 int optlen;
2041 printf("* Scan ELF binaries for stuff\n\n"
2042 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
2043 printf("Options: -[%s]\n", PARSE_FLAGS);
2044
2045 /* prescan the --long opt length to auto-align */
2046 optlen = 0;
2047 for (i = 0; long_opts[i].name; ++i) {
2048 int l = strlen(long_opts[i].name);
2049 if (long_opts[i].has_arg == a_argument)
2050 l += a_arg_len;
2051 optlen = max(l, optlen);
2052 }
2053
2054 for (i = 0; long_opts[i].name; ++i) {
2055 /* first output the short flag if it has one */
2056 if (long_opts[i].val > '~')
2057 printf(" ");
2058 else
2059 printf(" -%c, ", long_opts[i].val);
2060
2061 /* then the long flag */
2062 if (long_opts[i].has_arg == no_argument)
2063 printf("--%-*s", optlen, long_opts[i].name);
2064 else
2065 printf("--%s %s %*s", long_opts[i].name, a_arg,
2066 (int)(optlen - strlen(long_opts[i].name) - a_arg_len), "");
2067
2068 /* finally the help text */
2069 printf("* %s\n", opts_help[i]);
2070 }
2071
2072 puts("\nFor more information, see the scanelf(1) manpage");
2073 exit(status);
2074 }
2075
2076 /* parse command line arguments and preform needed actions */
2077 #define do_pax_state(option, flag) \
2078 if (islower(option)) { \
2079 flags &= ~PF_##flag; \
2080 flags |= PF_NO##flag; \
2081 } else { \
2082 flags &= ~PF_NO##flag; \
2083 flags |= PF_##flag; \
2084 }
2085 static int parseargs(int argc, char *argv[])
2086 {
2087 int i;
2088 const char *from_file = NULL;
2089 int ret = 0;
2090 char load_cache_config = 0;
2091
2092 opterr = 0;
2093 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
2094 switch (i) {
2095
2096 case 'V':
2097 printf("pax-utils-%s: %s compiled %s\n%s\n"
2098 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
2099 VERSION, __FILE__, __DATE__, rcsid, argv0);
2100 exit(EXIT_SUCCESS);
2101 break;
2102 case 'h': usage(EXIT_SUCCESS); break;
2103 case 'f':
2104 if (from_file) warn("You prob don't want to specify -f twice");
2105 from_file = optarg;
2106 break;
2107 case 'E':
2108 match_etypes = optarg;
2109 break;
2110 case 'M':
2111 match_bits = atoi(optarg);
2112 if (match_bits == 0) {
2113 if (strcmp(optarg, "ELFCLASS32") == 0)
2114 match_bits = 32;
2115 if (strcmp(optarg, "ELFCLASS64") == 0)
2116 match_bits = 64;
2117 }
2118 break;
2119 case 'O':
2120 if (sscanf(optarg, "%o", &match_perms) == -1)
2121 match_bits = 0;
2122 break;
2123 case 'o': {
2124 if (freopen(optarg, "w", stdout) == NULL)
2125 errp("Could not freopen(%s)", optarg);
2126 break;
2127 }
2128 case 'k':
2129 xarraypush_str(find_section_arr, optarg);
2130 break;
2131 case 's': {
2132 /* historically, this was comma delimited */
2133 char *this_sym = strtok(optarg, ",");
2134 if (!this_sym) /* edge case: -s '' */
2135 xarraypush_str(find_sym_arr, "");
2136 while (this_sym) {
2137 xarraypush_str(find_sym_arr, this_sym);
2138 this_sym = strtok(NULL, ",");
2139 }
2140 break;
2141 }
2142 case 'N':
2143 xarraypush_str(find_lib_arr, optarg);
2144 break;
2145 case 'F': {
2146 if (out_format) warn("You prob don't want to specify -F twice");
2147 out_format = optarg;
2148 break;
2149 }
2150 case 'z': {
2151 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
2152 size_t x;
2153
2154 for (x = 0; x < strlen(optarg); x++) {
2155 switch (optarg[x]) {
2156 case 'p':
2157 case 'P':
2158 do_pax_state(optarg[x], PAGEEXEC);
2159 break;
2160 case 's':
2161 case 'S':
2162 do_pax_state(optarg[x], SEGMEXEC);
2163 break;
2164 case 'm':
2165 case 'M':
2166 do_pax_state(optarg[x], MPROTECT);
2167 break;
2168 case 'e':
2169 case 'E':
2170 do_pax_state(optarg[x], EMUTRAMP);
2171 break;
2172 case 'r':
2173 case 'R':
2174 do_pax_state(optarg[x], RANDMMAP);
2175 break;
2176 case 'x':
2177 case 'X':
2178 do_pax_state(optarg[x], RANDEXEC);
2179 break;
2180 default:
2181 break;
2182 }
2183 }
2184 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
2185 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
2186 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
2187 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
2188 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
2189 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
2190 setpax = flags;
2191 break;
2192 }
2193 case 'Z': show_size = 1; break;
2194 case 'g': ++g_match; break;
2195 case 'L': load_cache_config = use_ldcache = 1; break;
2196 case 'y': scan_symlink = 0; break;
2197 case 'A': scan_archives = 1; break;
2198 case 'C': color_init(true); break;
2199 case 'B': show_banner = 0; break;
2200 case 'l': load_cache_config = scan_ldpath = 1; break;
2201 case 'p': scan_envpath = 1; break;
2202 case 'R': dir_recurse = 1; break;
2203 case 'm': dir_crossmount = 0; break;
2204 case 'X': ++fix_elf; break;
2205 case 'x': show_pax = 1; break;
2206 case 'e': show_phdr = 1; break;
2207 case 't': show_textrel = 1; break;
2208 case 'r': show_rpath = 1; break;
2209 case 'n': show_needed = 1; break;
2210 case 'i': show_interp = 1; break;
2211 case 'b': show_bind = 1; break;
2212 case 'S': show_soname = 1; break;
2213 case 'T': show_textrels = 1; break;
2214 case 'q': be_quiet = min(be_quiet, 20) + 1; break;
2215 case 'v': be_verbose = min(be_verbose, 20) + 1; break;
2216 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
2217 case 'D': show_endian = 1; break;
2218 case 'I': show_osabi = 1; break;
2219 case 'Y': show_eabi = 1; break;
2220 case 128:
2221 root_fd = open(optarg, O_RDONLY|O_CLOEXEC);
2222 if (root_fd == -1)
2223 err("Could not open root: %s", optarg);
2224 break;
2225 case 129: load_cache_config = use_ldpath = 1; break;
2226 case ':':
2227 err("Option '%c' is missing parameter", optopt);
2228 case '?':
2229 err("Unknown option '%c' or argument missing", optopt);
2230 default:
2231 err("Unhandled option '%c'; please report this", i);
2232 }
2233 }
2234 if (show_textrels && be_verbose)
2235 has_objdump = bin_in_path("objdump");
2236 /* precompile all the regexes */
2237 if (g_match) {
2238 regex_t preg;
2239 const char *this_sym;
2240 size_t n;
2241 int flags = REG_EXTENDED | REG_NOSUB | (g_match > 1 ? REG_ICASE : 0);
2242
2243 array_for_each(find_sym_arr, n, this_sym) {
2244 /* see scanelf_match_symname for logic info */
2245 switch (this_sym[0]) {
2246 case '%':
2247 while (*(this_sym++))
2248 if (*this_sym == '%') {
2249 ++this_sym;
2250 break;
2251 }
2252 break;
2253 case '+':
2254 case '-':
2255 ++this_sym;
2256 break;
2257 }
2258 if (*this_sym == '*')
2259 ++this_sym;
2260
2261 ret = regcomp(&preg, this_sym, flags);
2262 if (ret) {
2263 char err[256];
2264 regerror(ret, &preg, err, sizeof(err));
2265 err("regcomp of %s failed: %s", this_sym, err);
2266 }
2267 xarraypush(find_sym_regex_arr, &preg, sizeof(preg));
2268 }
2269 }
2270 /* flatten arrays for display */
2271 if (array_cnt(find_sym_arr))
2272 find_sym = array_flatten_str(find_sym_arr);
2273 if (array_cnt(find_lib_arr))
2274 find_lib = array_flatten_str(find_lib_arr);
2275 if (array_cnt(find_section_arr))
2276 find_section = array_flatten_str(find_section_arr);
2277 /* let the format option override all other options */
2278 if (out_format) {
2279 show_pax = show_phdr = show_textrel = show_rpath = \
2280 show_needed = show_interp = show_bind = show_soname = \
2281 show_textrels = show_perms = show_endian = show_size = \
2282 show_osabi = show_eabi = 0;
2283 for (i = 0; out_format[i]; ++i) {
2284 if (!IS_MODIFIER(out_format[i])) continue;
2285
2286 switch (out_format[++i]) {
2287 case '+': break;
2288 case '%': break;
2289 case '#': break;
2290 case 'F': break;
2291 case 'p': break;
2292 case 'f': break;
2293 case 'k': break;
2294 case 's': break;
2295 case 'N': break;
2296 case 'o': break;
2297 case 'a': break;
2298 case 'M': break;
2299 case 'Z': show_size = 1; break;
2300 case 'D': show_endian = 1; break;
2301 case 'I': show_osabi = 1; break;
2302 case 'Y': show_eabi = 1; break;
2303 case 'O': show_perms = 1; break;
2304 case 'x': show_pax = 1; break;
2305 case 'e': show_phdr = 1; break;
2306 case 't': show_textrel = 1; break;
2307 case 'r': show_rpath = 1; break;
2308 case 'n': show_needed = 1; break;
2309 case 'i': show_interp = 1; break;
2310 case 'b': show_bind = 1; break;
2311 case 'S': show_soname = 1; break;
2312 case 'T': show_textrels = 1; break;
2313 default:
2314 err("invalid format specifier '%c' (byte %i)",
2315 out_format[i], i+1);
2316 }
2317 }
2318
2319 /* construct our default format */
2320 } else {
2321 size_t fmt_len = 30;
2322 out_format = xmalloc(sizeof(char) * fmt_len);
2323 *out_format = '\0';
2324 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
2325 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
2326 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
2327 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
2328 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
2329 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
2330 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
2331 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
2332 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
2333 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
2334 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
2335 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
2336 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
2337 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
2338 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
2339 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
2340 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
2341 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
2342 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
2343 }
2344 if (be_verbose > 2) printf("Format: %s\n", out_format);
2345
2346 /* now lets actually do the scanning */
2347 if (load_cache_config)
2348 load_ld_cache_config(__PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
2349 if (scan_ldpath) scanelf_ldpath();
2350 if (scan_envpath) scanelf_envpath();
2351 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
2352 from_file = "-";
2353 if (from_file) {
2354 scanelf_from_file(from_file);
2355 from_file = *argv;
2356 }
2357 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
2358 err("Nothing to scan !?");
2359 while (optind < argc) {
2360 search_path = argv[optind++];
2361 ret = scanelf_dir(search_path);
2362 }
2363
2364 #ifdef __PAX_UTILS_CLEANUP
2365 /* clean up */
2366 xarrayfree(ldpaths);
2367 xarrayfree(find_sym_arr);
2368 xarrayfree(find_lib_arr);
2369 xarrayfree(find_section_arr);
2370 free(find_sym);
2371 free(find_lib);
2372 free(find_section);
2373 {
2374 size_t n;
2375 regex_t *preg;
2376 array_for_each(find_sym_regex_arr, n, preg)
2377 regfree(preg);
2378 xarrayfree(find_sym_regex_arr);
2379 }
2380
2381 if (ldcache != 0)
2382 munmap(ldcache, ldcache_size);
2383 #endif
2384
2385 return ret;
2386 }
2387
2388 static char **get_split_env(const char *envvar)
2389 {
2390 const char *delims = " \t\n";
2391 char **envvals = NULL;
2392 char *env, *s;
2393 int nentry;
2394
2395 if ((env = getenv(envvar)) == NULL)
2396 return NULL;
2397
2398 env = xstrdup(env);
2399 if (env == NULL)
2400 return NULL;
2401
2402 s = strtok(env, delims);
2403 if (s == NULL) {
2404 free(env);
2405 return NULL;
2406 }
2407
2408 nentry = 0;
2409 while (s != NULL) {
2410 ++nentry;
2411 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
2412 envvals[nentry-1] = s;
2413 s = strtok(NULL, delims);
2414 }
2415 envvals[nentry] = NULL;
2416
2417 /* don't want to free(env) as it contains the memory that backs
2418 * the envvals array of strings */
2419 return envvals;
2420 }
2421
2422 static void parseenv(void)
2423 {
2424 color_init(false);
2425 qa_textrels = get_split_env("QA_TEXTRELS");
2426 qa_execstack = get_split_env("QA_EXECSTACK");
2427 qa_wx_load = get_split_env("QA_WX_LOAD");
2428 }
2429
2430 #ifdef __PAX_UTILS_CLEANUP
2431 static void cleanup(void)
2432 {
2433 free(out_format);
2434 free(qa_textrels);
2435 free(qa_execstack);
2436 free(qa_wx_load);
2437 }
2438 #endif
2439
2440 int main(int argc, char *argv[])
2441 {
2442 int ret;
2443 if (argc < 2)
2444 usage(EXIT_FAILURE);
2445 parseenv();
2446 ret = parseargs(argc, argv);
2447 fclose(stdout);
2448 #ifdef __PAX_UTILS_CLEANUP
2449 cleanup();
2450 warn("The calls to add/delete heap should be off:\n"
2451 "\t- 1 due to the out_buffer not being freed in scanelf_fileat()\n"
2452 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
2453 #endif
2454 return ret;
2455 }
2456
2457 /* Match filename against entries in matchlist, return TRUE
2458 * if the file is listed */
2459 static int file_matches_list(const char *filename, char **matchlist)
2460 {
2461 char **file;
2462 char *match;
2463 char buf[__PAX_UTILS_PATH_MAX];
2464
2465 if (matchlist == NULL)
2466 return 0;
2467
2468 for (file = matchlist; *file != NULL; file++) {
2469 if (search_path) {
2470 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2471 match = buf;
2472 } else {
2473 match = *file;
2474 }
2475 if (fnmatch(match, filename, 0) == 0)
2476 return 1;
2477 }
2478 return 0;
2479 }

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