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Revision 1.252 - (show annotations) (download) (as text)
Sun Nov 18 07:39:45 2012 UTC (2 years ago) by vapier
Branch: MAIN
Changes since 1.251: +2 -7 lines
File MIME type: text/x-csrc
scanelf/pspax: drop PT_LOAD counts since more than "normal" is not a bug and is semi-common with some targets, and the warning has out lived its usefulness -- it was added as an initial sanity check to get a feel for the real world

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 1.251 2012/11/10 09:43:00 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 1.251 2012/11/10 09:43:00 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 #define LDSO_CACHE_MAGIC "ld.so-"
769 #define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
770 #define LDSO_CACHE_VER "1.7.0"
771 #define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
772 #define FLAG_ANY -1
773 #define FLAG_TYPE_MASK 0x00ff
774 #define FLAG_LIBC4 0x0000
775 #define FLAG_ELF 0x0001
776 #define FLAG_ELF_LIBC5 0x0002
777 #define FLAG_ELF_LIBC6 0x0003
778 #define FLAG_REQUIRED_MASK 0xff00
779 #define FLAG_SPARC_LIB64 0x0100
780 #define FLAG_IA64_LIB64 0x0200
781 #define FLAG_X8664_LIB64 0x0300
782 #define FLAG_S390_LIB64 0x0400
783 #define FLAG_POWERPC_LIB64 0x0500
784 #define FLAG_MIPS64_LIBN32 0x0600
785 #define FLAG_MIPS64_LIBN64 0x0700
786
787 #if defined(__GLIBC__) || defined(__UCLIBC__)
788
789 static char *lookup_cache_lib(elfobj *elf, const char *fname)
790 {
791 int fd;
792 char *strs;
793 static char buf[__PAX_UTILS_PATH_MAX] = "";
794 const char *cachefile = root_rel_path("/etc/ld.so.cache");
795 struct stat st;
796
797 typedef struct {
798 char magic[LDSO_CACHE_MAGIC_LEN];
799 char version[LDSO_CACHE_VER_LEN];
800 int nlibs;
801 } header_t;
802 header_t *header;
803
804 typedef struct {
805 int flags;
806 int sooffset;
807 int liboffset;
808 } libentry_t;
809 libentry_t *libent;
810
811 if (fname == NULL)
812 return NULL;
813
814 if (ldcache == NULL) {
815 if (fstatat(root_fd, cachefile, &st, 0))
816 return NULL;
817
818 fd = openat(root_fd, cachefile, O_RDONLY);
819 if (fd == -1)
820 return NULL;
821
822 /* cache these values so we only map/unmap the cache file once */
823 ldcache_size = st.st_size;
824 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
825 close(fd);
826
827 if (ldcache == MAP_FAILED) {
828 ldcache = NULL;
829 return NULL;
830 }
831
832 if (memcmp(header->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN) ||
833 memcmp(header->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
834 {
835 munmap(ldcache, ldcache_size);
836 ldcache = NULL;
837 return NULL;
838 }
839 } else
840 header = ldcache;
841
842 libent = ldcache + sizeof(header_t);
843 strs = (char *) &libent[header->nlibs];
844
845 for (fd = 0; fd < header->nlibs; ++fd) {
846 /* This should be more fine grained, but for now we assume that
847 * diff arches will not be cached together, and we ignore the
848 * the different multilib mips cases.
849 */
850 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
851 continue;
852 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
853 continue;
854
855 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
856 continue;
857
858 /* Return first hit because that is how the ldso rolls */
859 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
860 break;
861 }
862
863 return buf;
864 }
865
866 #elif defined(__NetBSD__)
867 static char *lookup_cache_lib(elfobj *elf, const char *fname)
868 {
869 static char buf[__PAX_UTILS_PATH_MAX] = "";
870 static struct stat st;
871 size_t n;
872 char *ldpath;
873
874 array_for_each(ldpath, n, ldpath) {
875 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", ldpath, fname) >= sizeof(buf))
876 continue; /* if the pathname is too long, or something went wrong, ignore */
877
878 if (stat(buf, &st) != 0)
879 continue; /* if the lib doesn't exist in *ldpath, look further */
880
881 /* NetBSD doesn't actually do sanity checks, it just loads the file
882 * and if that doesn't work, continues looking in other directories.
883 * This cannot easily be safely emulated, unfortunately. For now,
884 * just assume that if it exists, it's a valid library. */
885
886 return buf;
887 }
888
889 /* not found in any path */
890 return NULL;
891 }
892 #else
893 #ifdef __ELF__
894 #warning Cache support not implemented for your target
895 #endif
896 static char *lookup_cache_lib(elfobj *elf, const char *fname)
897 {
898 return NULL;
899 }
900 #endif
901
902 static char *lookup_config_lib(elfobj *elf, char *fname)
903 {
904 static char buf[__PAX_UTILS_PATH_MAX] = "";
905 const char *ldpath;
906 size_t n;
907
908 array_for_each(ldpaths, n, ldpath) {
909 snprintf(buf, sizeof(buf), "%s/%s", root_rel_path(ldpath), fname);
910 if (faccessat(root_fd, buf, F_OK, AT_SYMLINK_NOFOLLOW) == 0)
911 return buf;
912 }
913
914 return NULL;
915 }
916
917 static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
918 {
919 unsigned long i;
920 char *needed;
921 void *strtbl_void;
922 char *p;
923
924 /*
925 * -n -> op==0 -> print all
926 * -N -> op==1 -> print requested
927 */
928 if ((op == 0 && !show_needed) || (op == 1 && !find_lib))
929 return NULL;
930
931 strtbl_void = elf_findsecbyname(elf, ".dynstr");
932
933 if (elf->phdr && strtbl_void) {
934 #define SHOW_NEEDED(B) \
935 if (elf->elf_class == ELFCLASS ## B) { \
936 Elf ## B ## _Dyn *dyn; \
937 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
938 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
939 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
940 Elf ## B ## _Off offset; \
941 size_t matched = 0; \
942 /* Walk all the program headers to find the PT_DYNAMIC */ \
943 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
944 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) \
945 continue; \
946 offset = EGET(phdr[i].p_offset); \
947 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
948 continue; \
949 /* Walk all the dynamic tags to find NEEDED entries */ \
950 dyn = DYN ## B (elf->vdata + offset); \
951 while (EGET(dyn->d_tag) != DT_NULL) { \
952 if (EGET(dyn->d_tag) == DT_NEEDED) { \
953 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
954 if (offset >= (Elf ## B ## _Off)elf->len) { \
955 ++dyn; \
956 continue; \
957 } \
958 needed = elf->data + offset; \
959 if (op == 0) { \
960 /* -n -> print all entries */ \
961 if (!be_wewy_wewy_quiet) { \
962 if (*found_needed) xchrcat(ret, ',', ret_len); \
963 if (use_ldpath) { \
964 if ((p = lookup_config_lib(elf, needed)) != NULL) \
965 needed = p; \
966 } else if (use_ldcache) { \
967 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
968 needed = p; \
969 } \
970 xstrcat(ret, needed, ret_len); \
971 } \
972 *found_needed = 1; \
973 } else { \
974 /* -N -> print matching entries */ \
975 size_t n; \
976 const char *find_lib_name; \
977 \
978 array_for_each(find_lib_arr, n, find_lib_name) { \
979 int invert = 1; \
980 if (find_lib_name[0] == '!') \
981 invert = 0, ++find_lib_name; \
982 if (!strcmp(find_lib_name, needed) == invert) \
983 ++matched; \
984 } \
985 \
986 if (matched == array_cnt(find_lib_arr)) { \
987 *found_lib = 1; \
988 return (be_wewy_wewy_quiet ? NULL : find_lib); \
989 } \
990 } \
991 } \
992 ++dyn; \
993 } \
994 } }
995 SHOW_NEEDED(32)
996 SHOW_NEEDED(64)
997 if (op == 0 && !*found_needed && be_verbose)
998 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
999 }
1000
1001 return NULL;
1002 }
1003 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
1004 {
1005 void *strtbl_void;
1006
1007 if (!show_interp) return NULL;
1008
1009 strtbl_void = elf_findsecbyname(elf, ".interp");
1010
1011 if (strtbl_void) {
1012 #define SHOW_INTERP(B) \
1013 if (elf->elf_class == ELFCLASS ## B) { \
1014 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
1015 *found_interp = 1; \
1016 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
1017 }
1018 SHOW_INTERP(32)
1019 SHOW_INTERP(64)
1020 } else {
1021 /* Walk all the program headers to find the PT_INTERP */
1022 #define SHOW_PT_INTERP(B) \
1023 if (elf->elf_class == ELFCLASS ## B) { \
1024 unsigned long i; \
1025 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1026 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1027 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1028 if (EGET(phdr[i].p_type) != PT_INTERP) \
1029 continue; \
1030 *found_interp = 1; \
1031 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(phdr[i].p_offset)); \
1032 } \
1033 }
1034 SHOW_PT_INTERP(32)
1035 SHOW_PT_INTERP(64)
1036 }
1037
1038 return NULL;
1039 }
1040 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
1041 {
1042 unsigned long i;
1043 struct stat s;
1044 char dynamic = 0;
1045
1046 if (!show_bind) return NULL;
1047 if (!elf->phdr) return NULL;
1048
1049 #define SHOW_BIND(B) \
1050 if (elf->elf_class == ELFCLASS ## B) { \
1051 Elf ## B ## _Dyn *dyn; \
1052 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1053 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1054 Elf ## B ## _Off offset; \
1055 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1056 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1057 dynamic = 1; \
1058 offset = EGET(phdr[i].p_offset); \
1059 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
1060 dyn = DYN ## B (elf->vdata + offset); \
1061 while (EGET(dyn->d_tag) != DT_NULL) { \
1062 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
1063 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
1064 { \
1065 if (be_quiet) return NULL; \
1066 *found_bind = 1; \
1067 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
1068 } \
1069 ++dyn; \
1070 } \
1071 } \
1072 }
1073 SHOW_BIND(32)
1074 SHOW_BIND(64)
1075
1076 if (be_wewy_wewy_quiet) return NULL;
1077
1078 /* don't output anything if quiet mode and the ELF is static or not setuid */
1079 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
1080 return NULL;
1081 } else {
1082 *found_bind = 1;
1083 return (char *)(dynamic ? "LAZY" : "STATIC");
1084 }
1085 }
1086 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
1087 {
1088 unsigned long i;
1089 char *soname;
1090 void *strtbl_void;
1091
1092 if (!show_soname) return NULL;
1093
1094 strtbl_void = elf_findsecbyname(elf, ".dynstr");
1095
1096 if (elf->phdr && strtbl_void) {
1097 #define SHOW_SONAME(B) \
1098 if (elf->elf_class == ELFCLASS ## B) { \
1099 Elf ## B ## _Dyn *dyn; \
1100 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1101 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1102 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
1103 Elf ## B ## _Off offset; \
1104 /* only look for soname in shared objects */ \
1105 if (EGET(ehdr->e_type) != ET_DYN) \
1106 return NULL; \
1107 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1108 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1109 offset = EGET(phdr[i].p_offset); \
1110 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
1111 dyn = DYN ## B (elf->vdata + offset); \
1112 while (EGET(dyn->d_tag) != DT_NULL) { \
1113 if (EGET(dyn->d_tag) == DT_SONAME) { \
1114 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
1115 if (offset >= (Elf ## B ## _Off)elf->len) { \
1116 ++dyn; \
1117 continue; \
1118 } \
1119 soname = elf->data + offset; \
1120 *found_soname = 1; \
1121 return (be_wewy_wewy_quiet ? NULL : soname); \
1122 } \
1123 ++dyn; \
1124 } \
1125 } }
1126 SHOW_SONAME(32)
1127 SHOW_SONAME(64)
1128 }
1129
1130 return NULL;
1131 }
1132
1133 /*
1134 * We support the symbol form:
1135 * [%[modifiers]%][[+-]<symbol name>][,[.....]]
1136 * If the symbol name is empty, then all symbols are matched.
1137 * If the symbol name is a glob ("*"), then all symbols are dumped (debug).
1138 * Do not rely on this output format at all.
1139 * Otherwise the symbol name is used to search (either regex or string compare).
1140 * If the first char of the symbol name is a plus ("+"), then only match
1141 * defined symbols. If it's a minus ("-"), only match undefined symbols.
1142 * Putting modifiers in between the percent signs allows for more in depth
1143 * filters. There are groups of modifiers. If you don't specify a member
1144 * of a group, then all types in that group are matched. The current
1145 * groups and their types are:
1146 * STT group: STT_NOTYPE:n STT_OBJECT:o STT_FUNC:f STT_FILE:F
1147 * STB group: STB_LOCAL:l STB_GLOBAL:g STB_WEAK:w
1148 * SHN group: SHN_UNDEF:u SHN_ABS:a SHN_COMMON:c {defined}:d
1149 * The "defined" value in the SHN group does not correspond to a SHN_xxx define.
1150 * You can search for multiple symbols at once by seperating with a comma (",").
1151 *
1152 * Some examples:
1153 * ELFs with a weak function "foo":
1154 * scanelf -s %wf%foo <ELFs>
1155 * ELFs that define the symbol "main":
1156 * scanelf -s +main <ELFs>
1157 * scanelf -s %d%main <ELFs>
1158 * ELFs that refer to the undefined symbol "brk":
1159 * scanelf -s -brk <ELFs>
1160 * scanelf -s %u%brk <ELFs>
1161 * All global defined objects in an ELF:
1162 * scanelf -s %ogd% <ELF>
1163 */
1164 static void
1165 scanelf_match_symname(elfobj *elf, char *found_sym, char **ret, size_t *ret_len, const char *symname,
1166 unsigned int stt, unsigned int stb, unsigned int shn, unsigned long size)
1167 {
1168 const char *this_sym;
1169 size_t n;
1170
1171 array_for_each(find_sym_arr, n, this_sym) {
1172 bool inc_notype, inc_object, inc_func, inc_file,
1173 inc_local, inc_global, inc_weak,
1174 inc_def, inc_undef, inc_abs, inc_common;
1175
1176 /* symbol selection! */
1177 inc_notype = inc_object = inc_func = inc_file = \
1178 inc_local = inc_global = inc_weak = \
1179 inc_def = inc_undef = inc_abs = inc_common = \
1180 (*this_sym != '%');
1181
1182 /* parse the contents of %...% */
1183 if (!inc_notype) {
1184 while (*(this_sym++)) {
1185 if (*this_sym == '%') {
1186 ++this_sym;
1187 break;
1188 }
1189 switch (*this_sym) {
1190 case 'n': inc_notype = true; break;
1191 case 'o': inc_object = true; break;
1192 case 'f': inc_func = true; break;
1193 case 'F': inc_file = true; break;
1194 case 'l': inc_local = true; break;
1195 case 'g': inc_global = true; break;
1196 case 'w': inc_weak = true; break;
1197 case 'd': inc_def = true; break;
1198 case 'u': inc_undef = true; break;
1199 case 'a': inc_abs = true; break;
1200 case 'c': inc_common = true; break;
1201 default: err("invalid symbol selector '%c'", *this_sym);
1202 }
1203 }
1204
1205 /* If no types are matched, not match all */
1206 if (!inc_notype && !inc_object && !inc_func && !inc_file)
1207 inc_notype = inc_object = inc_func = inc_file = true;
1208 if (!inc_local && !inc_global && !inc_weak)
1209 inc_local = inc_global = inc_weak = true;
1210 if (!inc_def && !inc_undef && !inc_abs && !inc_common)
1211 inc_def = inc_undef = inc_abs = inc_common = true;
1212
1213 /* backwards compat for defined/undefined short hand */
1214 } else if (*this_sym == '+') {
1215 inc_undef = false;
1216 ++this_sym;
1217 } else if (*this_sym == '-') {
1218 inc_def = inc_abs = inc_common = false;
1219 ++this_sym;
1220 }
1221
1222 /* filter symbols */
1223 if ((!inc_notype && stt == STT_NOTYPE) || \
1224 (!inc_object && stt == STT_OBJECT) || \
1225 (!inc_func && stt == STT_FUNC ) || \
1226 (!inc_file && stt == STT_FILE ) || \
1227 (!inc_local && stb == STB_LOCAL ) || \
1228 (!inc_global && stb == STB_GLOBAL) || \
1229 (!inc_weak && stb == STB_WEAK ) || \
1230 (!inc_def && shn && shn < SHN_LORESERVE) || \
1231 (!inc_undef && shn == SHN_UNDEF ) || \
1232 (!inc_abs && shn == SHN_ABS ) || \
1233 (!inc_common && shn == SHN_COMMON))
1234 continue;
1235
1236 if (*this_sym == '*') {
1237 /* a "*" symbol gets you debug output */
1238 printf("%s(%s) %5lX %15s %15s %15s %s\n",
1239 ((*found_sym == 0) ? "\n\t" : "\t"),
1240 elf->base_filename,
1241 size,
1242 get_elfstttype(stt),
1243 get_elfstbtype(stb),
1244 get_elfshntype(shn),
1245 symname);
1246 goto matched;
1247
1248 } else {
1249 if (g_match) {
1250 /* regex match the symbol */
1251 if (regexec(find_sym_regex_arr->eles[n], symname, 0, NULL, 0) == REG_NOMATCH)
1252 continue;
1253
1254 } else if (*this_sym) {
1255 /* give empty symbols a "pass", else do a normal compare */
1256 const size_t len = strlen(this_sym);
1257 if (!(strncmp(this_sym, symname, len) == 0 &&
1258 /* Accept unversioned symbol names */
1259 (symname[len] == '\0' || symname[len] == '@')))
1260 continue;
1261 }
1262
1263 if (be_semi_verbose) {
1264 char buf[1024];
1265 snprintf(buf, sizeof(buf), "%lX %s %s",
1266 size,
1267 get_elfstttype(stt),
1268 this_sym);
1269 *ret = xstrdup(buf);
1270 } else {
1271 if (*ret) xchrcat(ret, ',', ret_len);
1272 xstrcat(ret, symname, ret_len);
1273 }
1274
1275 goto matched;
1276 }
1277 }
1278
1279 return;
1280
1281 matched:
1282 *found_sym = 1;
1283 }
1284
1285 static const char *scanelf_file_sym(elfobj *elf, char *found_sym)
1286 {
1287 char *ret;
1288 void *symtab_void, *strtab_void;
1289
1290 if (!find_sym) return NULL;
1291 ret = NULL;
1292
1293 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
1294
1295 if (symtab_void && strtab_void) {
1296 #define FIND_SYM(B) \
1297 if (elf->elf_class == ELFCLASS ## B) { \
1298 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
1299 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
1300 Elf ## B ## _Sym *sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
1301 Elf ## B ## _Word i, cnt = EGET(symtab->sh_entsize); \
1302 char *symname; \
1303 size_t ret_len = 0; \
1304 if (cnt) \
1305 cnt = EGET(symtab->sh_size) / cnt; \
1306 for (i = 0; i < cnt; ++i) { \
1307 if ((void*)sym > elf->data_end) { \
1308 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1309 goto break_out; \
1310 } \
1311 if (sym->st_name) { \
1312 /* make sure the symbol name is in acceptable memory range */ \
1313 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
1314 if ((void*)symname > elf->data_end) { \
1315 warnf("%s: corrupt ELF symbols", elf->filename); \
1316 ++sym; \
1317 continue; \
1318 } \
1319 scanelf_match_symname(elf, found_sym, \
1320 &ret, &ret_len, symname, \
1321 ELF##B##_ST_TYPE(EGET(sym->st_info)), \
1322 ELF##B##_ST_BIND(EGET(sym->st_info)), \
1323 EGET(sym->st_shndx), \
1324 /* st_size can be 64bit, but no one is really that big, so screw em */ \
1325 EGET(sym->st_size)); \
1326 } \
1327 ++sym; \
1328 } \
1329 }
1330 FIND_SYM(32)
1331 FIND_SYM(64)
1332 }
1333
1334 break_out:
1335 if (be_wewy_wewy_quiet) return NULL;
1336
1337 if (*find_sym != '*' && *found_sym)
1338 return ret;
1339 if (be_quiet)
1340 return NULL;
1341 else
1342 return " - ";
1343 }
1344
1345 static const char *scanelf_file_sections(elfobj *elf, char *found_section)
1346 {
1347 if (!find_section)
1348 return NULL;
1349
1350 #define FIND_SECTION(B) \
1351 if (elf->elf_class == ELFCLASS ## B) { \
1352 size_t matched, n; \
1353 int invert; \
1354 const char *section_name; \
1355 Elf ## B ## _Shdr *section; \
1356 \
1357 matched = 0; \
1358 array_for_each(find_section_arr, n, section_name) { \
1359 invert = (*section_name == '!' ? 1 : 0); \
1360 section = SHDR ## B (elf_findsecbyname(elf, section_name + invert)); \
1361 if ((section == NULL && invert) || (section != NULL && !invert)) \
1362 ++matched; \
1363 } \
1364 \
1365 if (matched == array_cnt(find_section_arr)) \
1366 *found_section = 1; \
1367 }
1368 FIND_SECTION(32)
1369 FIND_SECTION(64)
1370
1371 if (be_wewy_wewy_quiet)
1372 return NULL;
1373
1374 if (*found_section)
1375 return find_section;
1376
1377 if (be_quiet)
1378 return NULL;
1379 else
1380 return " - ";
1381 }
1382
1383 /* scan an elf file and show all the fun stuff */
1384 #define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
1385 static int scanelf_elfobj(elfobj *elf)
1386 {
1387 unsigned long i;
1388 char found_pax, found_phdr, found_relro, found_load, found_textrel,
1389 found_rpath, found_needed, found_interp, found_bind, found_soname,
1390 found_sym, found_lib, found_file, found_textrels, found_section;
1391 static char *out_buffer = NULL;
1392 static size_t out_len;
1393
1394 found_pax = found_phdr = found_relro = found_load = found_textrel = \
1395 found_rpath = found_needed = found_interp = found_bind = found_soname = \
1396 found_sym = found_lib = found_file = found_textrels = found_section = 0;
1397
1398 if (be_verbose > 2)
1399 printf("%s: scanning file {%s,%s}\n", elf->filename,
1400 get_elfeitype(EI_CLASS, elf->elf_class),
1401 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
1402 else if (be_verbose > 1)
1403 printf("%s: scanning file\n", elf->filename);
1404
1405 /* init output buffer */
1406 if (!out_buffer) {
1407 out_len = sizeof(char) * 80;
1408 out_buffer = xmalloc(out_len);
1409 }
1410 *out_buffer = '\0';
1411
1412 /* show the header */
1413 if (!be_quiet && show_banner) {
1414 for (i = 0; out_format[i]; ++i) {
1415 if (!IS_MODIFIER(out_format[i])) continue;
1416
1417 switch (out_format[++i]) {
1418 case '+': break;
1419 case '%': break;
1420 case '#': break;
1421 case 'F':
1422 case 'p':
1423 case 'f': prints("FILE "); found_file = 1; break;
1424 case 'o': prints(" TYPE "); break;
1425 case 'x': prints(" PAX "); break;
1426 case 'e': prints("STK/REL/PTL "); break;
1427 case 't': prints("TEXTREL "); break;
1428 case 'r': prints("RPATH "); break;
1429 case 'M': prints("CLASS "); break;
1430 case 'l':
1431 case 'n': prints("NEEDED "); break;
1432 case 'i': prints("INTERP "); break;
1433 case 'b': prints("BIND "); break;
1434 case 'Z': prints("SIZE "); break;
1435 case 'S': prints("SONAME "); break;
1436 case 's': prints("SYM "); break;
1437 case 'N': prints("LIB "); break;
1438 case 'T': prints("TEXTRELS "); break;
1439 case 'k': prints("SECTION "); break;
1440 case 'a': prints("ARCH "); break;
1441 case 'I': prints("OSABI "); break;
1442 case 'Y': prints("EABI "); break;
1443 case 'O': prints("PERM "); break;
1444 case 'D': prints("ENDIAN "); break;
1445 default: warnf("'%c' has no title ?", out_format[i]);
1446 }
1447 }
1448 if (!found_file) prints("FILE ");
1449 prints("\n");
1450 found_file = 0;
1451 show_banner = 0;
1452 }
1453
1454 /* dump all the good stuff */
1455 for (i = 0; out_format[i]; ++i) {
1456 const char *out;
1457 const char *tmp;
1458 static char ubuf[sizeof(unsigned long)*2];
1459 if (!IS_MODIFIER(out_format[i])) {
1460 xchrcat(&out_buffer, out_format[i], &out_len);
1461 continue;
1462 }
1463
1464 out = NULL;
1465 be_wewy_wewy_quiet = (out_format[i] == '#');
1466 be_semi_verbose = (out_format[i] == '+');
1467 switch (out_format[++i]) {
1468 case '+':
1469 case '%':
1470 case '#':
1471 xchrcat(&out_buffer, out_format[i], &out_len); break;
1472 case 'F':
1473 found_file = 1;
1474 if (be_wewy_wewy_quiet) break;
1475 xstrcat(&out_buffer, elf->filename, &out_len);
1476 break;
1477 case 'p':
1478 found_file = 1;
1479 if (be_wewy_wewy_quiet) break;
1480 tmp = elf->filename;
1481 if (search_path) {
1482 ssize_t len_search = strlen(search_path);
1483 ssize_t len_file = strlen(elf->filename);
1484 if (!strncmp(elf->filename, search_path, len_search) && \
1485 len_file > len_search)
1486 tmp += len_search;
1487 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1488 }
1489 xstrcat(&out_buffer, tmp, &out_len);
1490 break;
1491 case 'f':
1492 found_file = 1;
1493 if (be_wewy_wewy_quiet) break;
1494 tmp = strrchr(elf->filename, '/');
1495 tmp = (tmp == NULL ? elf->filename : tmp+1);
1496 xstrcat(&out_buffer, tmp, &out_len);
1497 break;
1498 case 'o': out = get_elfetype(elf); break;
1499 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
1500 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
1501 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1502 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
1503 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1504 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1505 case 'D': out = get_endian(elf); break;
1506 case 'O': out = strfileperms(elf->filename); break;
1507 case 'n':
1508 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
1509 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1510 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1511 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
1512 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1513 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1514 case 'a': out = get_elfemtype(elf); break;
1515 case 'I': out = get_elfosabi(elf); break;
1516 case 'Y': out = get_elf_eabi(elf); break;
1517 case 'Z': snprintf(ubuf, sizeof(ubuf), "%lu", (unsigned long)elf->len); out = ubuf; break;;
1518 default: warnf("'%c' has no scan code?", out_format[i]);
1519 }
1520 if (out)
1521 xstrcat(&out_buffer, out, &out_len);
1522 }
1523
1524 #define FOUND_SOMETHING() \
1525 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1526 found_rpath || found_needed || found_interp || found_bind || \
1527 found_soname || found_sym || found_lib || found_textrels || found_section )
1528
1529 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1530 xchrcat(&out_buffer, ' ', &out_len);
1531 xstrcat(&out_buffer, elf->filename, &out_len);
1532 }
1533 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
1534 puts(out_buffer);
1535 fflush(stdout);
1536 }
1537
1538 return 0;
1539 }
1540
1541 /* scan a single elf */
1542 static int scanelf_elf(const char *filename, int fd, size_t len)
1543 {
1544 int ret = 1;
1545 elfobj *elf;
1546
1547 /* verify this is real ELF */
1548 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1549 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1550 return 2;
1551 }
1552 switch (match_bits) {
1553 case 32:
1554 if (elf->elf_class != ELFCLASS32)
1555 goto label_done;
1556 break;
1557 case 64:
1558 if (elf->elf_class != ELFCLASS64)
1559 goto label_done;
1560 break;
1561 default: break;
1562 }
1563 if (match_etypes) {
1564 char sbuf[126];
1565 strncpy(sbuf, match_etypes, sizeof(sbuf));
1566 if (strchr(match_etypes, ',') != NULL) {
1567 char *p;
1568 while ((p = strrchr(sbuf, ',')) != NULL) {
1569 *p = 0;
1570 if (etype_lookup(p+1) == get_etype(elf))
1571 goto label_ret;
1572 }
1573 }
1574 if (etype_lookup(sbuf) != get_etype(elf))
1575 goto label_done;
1576 }
1577
1578 label_ret:
1579 ret = scanelf_elfobj(elf);
1580
1581 label_done:
1582 unreadelf(elf);
1583 return ret;
1584 }
1585
1586 /* scan an archive of elfs */
1587 static int scanelf_archive(const char *filename, int fd, size_t len)
1588 {
1589 archive_handle *ar;
1590 archive_member *m;
1591 char *ar_buffer;
1592 elfobj *elf;
1593
1594 ar = ar_open_fd(filename, fd);
1595 if (ar == NULL)
1596 return 1;
1597
1598 ar_buffer = mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1599 while ((m = ar_next(ar)) != NULL) {
1600 off_t cur_pos = lseek(fd, 0, SEEK_CUR);
1601 if (cur_pos == -1)
1602 errp("lseek() failed");
1603 elf = readelf_buffer(m->name, ar_buffer + cur_pos, m->size);
1604 if (elf) {
1605 scanelf_elfobj(elf);
1606 unreadelf(elf);
1607 }
1608 }
1609 munmap(ar_buffer, len);
1610
1611 return 0;
1612 }
1613 /* scan a file which may be an elf or an archive or some other magical beast */
1614 static int scanelf_fileat(int dir_fd, const char *filename, const struct stat *st_cache)
1615 {
1616 const struct stat *st = st_cache;
1617 struct stat symlink_st;
1618 int fd;
1619
1620 /* always handle regular files and handle symlinked files if no -y */
1621 if (S_ISLNK(st->st_mode)) {
1622 if (!scan_symlink)
1623 return 1;
1624 fstatat(dir_fd, filename, &symlink_st, 0);
1625 st = &symlink_st;
1626 }
1627
1628 if (!S_ISREG(st->st_mode)) {
1629 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1630 return 1;
1631 }
1632
1633 if (match_perms) {
1634 if ((st->st_mode | match_perms) != st->st_mode)
1635 return 1;
1636 }
1637 fd = openat(dir_fd, filename, (fix_elf ? O_RDWR : O_RDONLY) | O_CLOEXEC);
1638 if (fd == -1) {
1639 if (fix_elf && errno == ETXTBSY)
1640 warnp("%s: could not fix", filename);
1641 else if (be_verbose > 2)
1642 printf("%s: skipping file: %s\n", filename, strerror(errno));
1643 return 1;
1644 }
1645
1646 if (scanelf_elf(filename, fd, st->st_size) == 2) {
1647 /* if it isn't an ELF, maybe it's an .a archive */
1648 if (scan_archives)
1649 scanelf_archive(filename, fd, st->st_size);
1650
1651 /*
1652 * unreadelf() implicitly closes its fd, so only close it
1653 * when we are returning it in the non-ELF case
1654 */
1655 close(fd);
1656 }
1657
1658 return 0;
1659 }
1660
1661 /* scan a directory for ET_EXEC files and print when we find one */
1662 static int scanelf_dirat(int dir_fd, const char *path)
1663 {
1664 register DIR *dir;
1665 register struct dirent *dentry;
1666 struct stat st_top, st;
1667 char buf[__PAX_UTILS_PATH_MAX], *subpath;
1668 size_t pathlen = 0, len = 0;
1669 int ret = 0;
1670 int subdir_fd;
1671
1672 /* make sure path exists */
1673 if (fstatat(dir_fd, path, &st_top, AT_SYMLINK_NOFOLLOW) == -1) {
1674 if (be_verbose > 2) printf("%s: does not exist\n", path);
1675 return 1;
1676 }
1677
1678 /* ok, if it isn't a directory, assume we can open it */
1679 if (!S_ISDIR(st_top.st_mode))
1680 return scanelf_fileat(dir_fd, path, &st_top);
1681
1682 /* now scan the dir looking for fun stuff */
1683 subdir_fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
1684 if (subdir_fd == -1)
1685 dir = NULL;
1686 else
1687 dir = fdopendir(subdir_fd);
1688 if (dir == NULL) {
1689 if (subdir_fd != -1)
1690 close(subdir_fd);
1691 warnfp("could not opendir(%s)", path);
1692 return 1;
1693 }
1694 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1695
1696 subpath = stpcpy(buf, path);
1697 if (subpath[-1] != '/')
1698 *subpath++ = '/';
1699 pathlen = subpath - buf;
1700 while ((dentry = readdir(dir))) {
1701 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1702 continue;
1703
1704 if (fstatat(subdir_fd, dentry->d_name, &st, AT_SYMLINK_NOFOLLOW) == -1)
1705 continue;
1706
1707 len = strlen(dentry->d_name);
1708 if (len + pathlen + 1 >= sizeof(buf)) {
1709 warnf("Skipping '%s%s': len > sizeof(buf); %zu > %zu\n",
1710 path, dentry->d_name, len + pathlen + 1, sizeof(buf));
1711 continue;
1712 }
1713 memcpy(subpath, dentry->d_name, len);
1714 subpath[len] = '\0';
1715
1716 if (S_ISREG(st.st_mode))
1717 ret = scanelf_fileat(dir_fd, buf, &st);
1718 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1719 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1720 ret = scanelf_dirat(dir_fd, buf);
1721 }
1722 }
1723 closedir(dir);
1724
1725 return ret;
1726 }
1727 static int scanelf_dir(const char *path)
1728 {
1729 return scanelf_dirat(root_fd, root_rel_path(path));
1730 }
1731
1732 static int scanelf_from_file(const char *filename)
1733 {
1734 FILE *fp;
1735 char *p, *path;
1736 size_t len;
1737 int ret;
1738
1739 if (strcmp(filename, "-") == 0)
1740 fp = stdin;
1741 else if ((fp = fopen(filename, "r")) == NULL)
1742 return 1;
1743
1744 path = NULL;
1745 len = 0;
1746 ret = 0;
1747 while (getline(&path, &len, fp) != -1) {
1748 if ((p = strchr(path, '\n')) != NULL)
1749 *p = 0;
1750 search_path = path;
1751 ret = scanelf_dir(path);
1752 }
1753 free(path);
1754
1755 if (fp != stdin)
1756 fclose(fp);
1757
1758 return ret;
1759 }
1760
1761 #if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1762
1763 static int _load_ld_cache_config(const char *fname)
1764 {
1765 FILE *fp = NULL;
1766 char *p, *path;
1767 size_t len;
1768 int curr_fd = -1;
1769
1770 fp = fopenat_r(root_fd, root_rel_path(fname));
1771 if (fp == NULL)
1772 return -1;
1773
1774 path = NULL;
1775 len = 0;
1776 while (getline(&path, &len, fp) != -1) {
1777 if ((p = strrchr(path, '\r')) != NULL)
1778 *p = 0;
1779 if ((p = strchr(path, '\n')) != NULL)
1780 *p = 0;
1781
1782 /* recursive includes of the same file will make this segfault. */
1783 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1784 glob_t gl;
1785 size_t x;
1786 const char *gpath;
1787
1788 /* re-use existing path buffer ... need to be creative */
1789 if (path[8] != '/')
1790 gpath = memcpy(path + 3, "/etc/", 5);
1791 else
1792 gpath = path + 8;
1793 if (root_fd != AT_FDCWD) {
1794 if (curr_fd == -1) {
1795 curr_fd = open(".", O_RDONLY|O_CLOEXEC);
1796 if (fchdir(root_fd))
1797 errp("unable to change to root dir");
1798 }
1799 gpath = root_rel_path(gpath);
1800 }
1801
1802 if (glob(gpath, 0, NULL, &gl) == 0) {
1803 for (x = 0; x < gl.gl_pathc; ++x) {
1804 /* try to avoid direct loops */
1805 if (strcmp(gl.gl_pathv[x], fname) == 0)
1806 continue;
1807 _load_ld_cache_config(gl.gl_pathv[x]);
1808 }
1809 globfree(&gl);
1810 }
1811
1812 /* failed globs are ignored by glibc */
1813 continue;
1814 }
1815
1816 if (*path != '/')
1817 continue;
1818
1819 xarraypush_str(ldpaths, path);
1820 }
1821 free(path);
1822
1823 fclose(fp);
1824
1825 if (curr_fd != -1) {
1826 if (fchdir(curr_fd))
1827 /* don't care */;
1828 close(curr_fd);
1829 }
1830
1831 return 0;
1832 }
1833
1834 #elif defined(__FreeBSD__) || defined(__DragonFly__)
1835
1836 static int _load_ld_cache_config(const char *fname)
1837 {
1838 FILE *fp = NULL;
1839 char *b = NULL, *p;
1840 struct elfhints_hdr hdr;
1841
1842 fp = fopenat_r(root_fd, root_rel_path(fname));
1843 if (fp == NULL)
1844 return -1;
1845
1846 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1847 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1848 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1849 {
1850 fclose(fp);
1851 return -1;
1852 }
1853
1854 b = xmalloc(hdr.dirlistlen + 1);
1855 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1856 fclose(fp);
1857 free(b);
1858 return -1;
1859 }
1860
1861 while ((p = strsep(&b, ":"))) {
1862 if (*p == '\0')
1863 continue;
1864 xarraypush_str(ldpaths, p);
1865 }
1866
1867 free(b);
1868 fclose(fp);
1869 return 0;
1870 }
1871
1872 #else
1873 #ifdef __ELF__
1874 #warning Cache config support not implemented for your target
1875 #endif
1876 static int _load_ld_cache_config(const char *fname)
1877 {
1878 return 0;
1879 }
1880 #endif
1881
1882 static void load_ld_cache_config(const char *fname)
1883 {
1884 bool scan_l, scan_ul, scan_ull;
1885 size_t n;
1886 const char *ldpath;
1887
1888 _load_ld_cache_config(fname);
1889
1890 scan_l = scan_ul = scan_ull = false;
1891 if (array_cnt(ldpaths)) {
1892 array_for_each(ldpaths, n, ldpath) {
1893 if (!scan_l && !strcmp(ldpath, "/lib")) scan_l = true;
1894 if (!scan_ul && !strcmp(ldpath, "/usr/lib")) scan_ul = true;
1895 if (!scan_ull && !strcmp(ldpath, "/usr/local/lib")) scan_ull = true;
1896 }
1897 }
1898
1899 if (!scan_l) xarraypush_str(ldpaths, "/lib");
1900 if (!scan_ul) xarraypush_str(ldpaths, "/usr/lib");
1901 if (!scan_ull) xarraypush_str(ldpaths, "/usr/local/lib");
1902 }
1903
1904 /* scan /etc/ld.so.conf for paths */
1905 static void scanelf_ldpath(void)
1906 {
1907 size_t n;
1908 const char *ldpath;
1909
1910 array_for_each(ldpaths, n, ldpath)
1911 scanelf_dir(ldpath);
1912 }
1913
1914 /* scan env PATH for paths */
1915 static void scanelf_envpath(void)
1916 {
1917 char *path, *p;
1918
1919 path = getenv("PATH");
1920 if (!path)
1921 err("PATH is not set in your env !");
1922 path = xstrdup(path);
1923
1924 while ((p = strrchr(path, ':')) != NULL) {
1925 scanelf_dir(p + 1);
1926 *p = 0;
1927 }
1928
1929 free(path);
1930 }
1931
1932 /* usage / invocation handling functions */ /* Free Flags: c d j u w G H J K P Q U W */
1933 #define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZCBhV"
1934 #define a_argument required_argument
1935 static struct option const long_opts[] = {
1936 {"path", no_argument, NULL, 'p'},
1937 {"ldpath", no_argument, NULL, 'l'},
1938 {"use-ldpath",no_argument, NULL, 129},
1939 {"root", a_argument, NULL, 128},
1940 {"recursive", no_argument, NULL, 'R'},
1941 {"mount", no_argument, NULL, 'm'},
1942 {"symlink", no_argument, NULL, 'y'},
1943 {"archives", no_argument, NULL, 'A'},
1944 {"ldcache", no_argument, NULL, 'L'},
1945 {"fix", no_argument, NULL, 'X'},
1946 {"setpax", a_argument, NULL, 'z'},
1947 {"pax", no_argument, NULL, 'x'},
1948 {"header", no_argument, NULL, 'e'},
1949 {"textrel", no_argument, NULL, 't'},
1950 {"rpath", no_argument, NULL, 'r'},
1951 {"needed", no_argument, NULL, 'n'},
1952 {"interp", no_argument, NULL, 'i'},
1953 {"bind", no_argument, NULL, 'b'},
1954 {"soname", no_argument, NULL, 'S'},
1955 {"symbol", a_argument, NULL, 's'},
1956 {"section", a_argument, NULL, 'k'},
1957 {"lib", a_argument, NULL, 'N'},
1958 {"gmatch", no_argument, NULL, 'g'},
1959 {"textrels", no_argument, NULL, 'T'},
1960 {"etype", a_argument, NULL, 'E'},
1961 {"bits", a_argument, NULL, 'M'},
1962 {"endian", no_argument, NULL, 'D'},
1963 {"osabi", no_argument, NULL, 'I'},
1964 {"eabi", no_argument, NULL, 'Y'},
1965 {"perms", a_argument, NULL, 'O'},
1966 {"size", no_argument, NULL, 'Z'},
1967 {"all", no_argument, NULL, 'a'},
1968 {"quiet", no_argument, NULL, 'q'},
1969 {"verbose", no_argument, NULL, 'v'},
1970 {"format", a_argument, NULL, 'F'},
1971 {"from", a_argument, NULL, 'f'},
1972 {"file", a_argument, NULL, 'o'},
1973 {"nocolor", no_argument, NULL, 'C'},
1974 {"nobanner", no_argument, NULL, 'B'},
1975 {"help", no_argument, NULL, 'h'},
1976 {"version", no_argument, NULL, 'V'},
1977 {NULL, no_argument, NULL, 0x0}
1978 };
1979
1980 static const char * const opts_help[] = {
1981 "Scan all directories in PATH environment",
1982 "Scan all directories in /etc/ld.so.conf",
1983 "Use ld.so.conf to show full path (use with -r/-n)",
1984 "Root directory (use with -l or -p)",
1985 "Scan directories recursively",
1986 "Don't recursively cross mount points",
1987 "Don't scan symlinks",
1988 "Scan archives (.a files)",
1989 "Utilize ld.so.cache to show full path (use with -r/-n)",
1990 "Try and 'fix' bad things (use with -r/-e)",
1991 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1992 "Print PaX markings",
1993 "Print GNU_STACK/PT_LOAD markings",
1994 "Print TEXTREL information",
1995 "Print RPATH information",
1996 "Print NEEDED information",
1997 "Print INTERP information",
1998 "Print BIND information",
1999 "Print SONAME information",
2000 "Find a specified symbol",
2001 "Find a specified section",
2002 "Find a specified library",
2003 "Use regex rather than string compare (with -s); specify twice for case insensitive",
2004 "Locate cause of TEXTREL",
2005 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
2006 "Print only ELF files matching numeric bits",
2007 "Print Endianness",
2008 "Print OSABI",
2009 "Print EABI (EM_ARM Only)",
2010 "Print only ELF files matching octal permissions",
2011 "Print ELF file size",
2012 "Print all useful/simple info\n",
2013 "Only output 'bad' things",
2014 "Be verbose (can be specified more than once)",
2015 "Use specified format for output",
2016 "Read input stream from a filename",
2017 "Write output stream to a filename",
2018 "Don't emit color in output",
2019 "Don't display the header",
2020 "Print this help and exit",
2021 "Print version and exit",
2022 NULL
2023 };
2024
2025 /* display usage and exit */
2026 static void usage(int status)
2027 {
2028 unsigned long i;
2029 printf("* Scan ELF binaries for stuff\n\n"
2030 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
2031 printf("Options: -[%s]\n", PARSE_FLAGS);
2032 for (i = 0; long_opts[i].name; ++i) {
2033 /* first output the short flag if it has one */
2034 if (long_opts[i].val > '~')
2035 printf(" ");
2036 else
2037 printf(" -%c, ", long_opts[i].val);
2038
2039 /* then the long flag */
2040 if (long_opts[i].has_arg == no_argument)
2041 printf("--%-14s", long_opts[i].name);
2042 else
2043 printf("--%-7s <arg> ", long_opts[i].name);
2044
2045 /* finally the help text */
2046 printf("* %s\n", opts_help[i]);
2047 }
2048
2049 puts("\nFor more information, see the scanelf(1) manpage");
2050 exit(status);
2051 }
2052
2053 /* parse command line arguments and preform needed actions */
2054 #define do_pax_state(option, flag) \
2055 if (islower(option)) { \
2056 flags &= ~PF_##flag; \
2057 flags |= PF_NO##flag; \
2058 } else { \
2059 flags &= ~PF_NO##flag; \
2060 flags |= PF_##flag; \
2061 }
2062 static int parseargs(int argc, char *argv[])
2063 {
2064 int i;
2065 const char *from_file = NULL;
2066 int ret = 0;
2067 char load_cache_config = 0;
2068
2069 opterr = 0;
2070 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
2071 switch (i) {
2072
2073 case 'V':
2074 printf("pax-utils-%s: %s compiled %s\n%s\n"
2075 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
2076 VERSION, __FILE__, __DATE__, rcsid, argv0);
2077 exit(EXIT_SUCCESS);
2078 break;
2079 case 'h': usage(EXIT_SUCCESS); break;
2080 case 'f':
2081 if (from_file) warn("You prob don't want to specify -f twice");
2082 from_file = optarg;
2083 break;
2084 case 'E':
2085 match_etypes = optarg;
2086 break;
2087 case 'M':
2088 match_bits = atoi(optarg);
2089 if (match_bits == 0) {
2090 if (strcmp(optarg, "ELFCLASS32") == 0)
2091 match_bits = 32;
2092 if (strcmp(optarg, "ELFCLASS64") == 0)
2093 match_bits = 64;
2094 }
2095 break;
2096 case 'O':
2097 if (sscanf(optarg, "%o", &match_perms) == -1)
2098 match_bits = 0;
2099 break;
2100 case 'o': {
2101 if (freopen(optarg, "w", stdout) == NULL)
2102 errp("Could not freopen(%s)", optarg);
2103 break;
2104 }
2105 case 'k':
2106 xarraypush_str(find_section_arr, optarg);
2107 break;
2108 case 's': {
2109 /* historically, this was comma delimited */
2110 char *this_sym = strtok(optarg, ",");
2111 if (!this_sym) /* edge case: -s '' */
2112 xarraypush_str(find_sym_arr, "");
2113 while (this_sym) {
2114 xarraypush_str(find_sym_arr, this_sym);
2115 this_sym = strtok(NULL, ",");
2116 }
2117 break;
2118 }
2119 case 'N':
2120 xarraypush_str(find_lib_arr, optarg);
2121 break;
2122 case 'F': {
2123 if (out_format) warn("You prob don't want to specify -F twice");
2124 out_format = optarg;
2125 break;
2126 }
2127 case 'z': {
2128 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
2129 size_t x;
2130
2131 for (x = 0; x < strlen(optarg); x++) {
2132 switch (optarg[x]) {
2133 case 'p':
2134 case 'P':
2135 do_pax_state(optarg[x], PAGEEXEC);
2136 break;
2137 case 's':
2138 case 'S':
2139 do_pax_state(optarg[x], SEGMEXEC);
2140 break;
2141 case 'm':
2142 case 'M':
2143 do_pax_state(optarg[x], MPROTECT);
2144 break;
2145 case 'e':
2146 case 'E':
2147 do_pax_state(optarg[x], EMUTRAMP);
2148 break;
2149 case 'r':
2150 case 'R':
2151 do_pax_state(optarg[x], RANDMMAP);
2152 break;
2153 case 'x':
2154 case 'X':
2155 do_pax_state(optarg[x], RANDEXEC);
2156 break;
2157 default:
2158 break;
2159 }
2160 }
2161 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
2162 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
2163 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
2164 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
2165 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
2166 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
2167 setpax = flags;
2168 break;
2169 }
2170 case 'Z': show_size = 1; break;
2171 case 'g': ++g_match; break;
2172 case 'L': load_cache_config = use_ldcache = 1; break;
2173 case 'y': scan_symlink = 0; break;
2174 case 'A': scan_archives = 1; break;
2175 case 'C': color_init(true); break;
2176 case 'B': show_banner = 0; break;
2177 case 'l': load_cache_config = scan_ldpath = 1; break;
2178 case 'p': scan_envpath = 1; break;
2179 case 'R': dir_recurse = 1; break;
2180 case 'm': dir_crossmount = 0; break;
2181 case 'X': ++fix_elf; break;
2182 case 'x': show_pax = 1; break;
2183 case 'e': show_phdr = 1; break;
2184 case 't': show_textrel = 1; break;
2185 case 'r': show_rpath = 1; break;
2186 case 'n': show_needed = 1; break;
2187 case 'i': show_interp = 1; break;
2188 case 'b': show_bind = 1; break;
2189 case 'S': show_soname = 1; break;
2190 case 'T': show_textrels = 1; break;
2191 case 'q': be_quiet = 1; break;
2192 case 'v': be_verbose = (be_verbose % 20) + 1; break;
2193 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
2194 case 'D': show_endian = 1; break;
2195 case 'I': show_osabi = 1; break;
2196 case 'Y': show_eabi = 1; break;
2197 case 128:
2198 root_fd = open(optarg, O_RDONLY|O_CLOEXEC);
2199 if (root_fd == -1)
2200 err("Could not open root: %s", optarg);
2201 break;
2202 case 129: load_cache_config = use_ldpath = 1; break;
2203 case ':':
2204 err("Option '%c' is missing parameter", optopt);
2205 case '?':
2206 err("Unknown option '%c' or argument missing", optopt);
2207 default:
2208 err("Unhandled option '%c'; please report this", i);
2209 }
2210 }
2211 if (show_textrels && be_verbose)
2212 has_objdump = bin_in_path("objdump");
2213 /* precompile all the regexes */
2214 if (g_match) {
2215 regex_t preg;
2216 const char *this_sym;
2217 size_t n;
2218 int flags = REG_EXTENDED | REG_NOSUB | (g_match > 1 ? REG_ICASE : 0);
2219
2220 array_for_each(find_sym_arr, n, this_sym) {
2221 /* see scanelf_match_symname for logic info */
2222 switch (this_sym[0]) {
2223 case '%':
2224 while (*(this_sym++))
2225 if (*this_sym == '%') {
2226 ++this_sym;
2227 break;
2228 }
2229 break;
2230 case '+':
2231 case '-':
2232 ++this_sym;
2233 break;
2234 }
2235 if (*this_sym == '*')
2236 ++this_sym;
2237
2238 ret = regcomp(&preg, this_sym, flags);
2239 if (ret) {
2240 char err[256];
2241 regerror(ret, &preg, err, sizeof(err));
2242 err("regcomp of %s failed: %s", this_sym, err);
2243 }
2244 xarraypush(find_sym_regex_arr, &preg, sizeof(preg));
2245 }
2246 }
2247 /* flatten arrays for display */
2248 if (array_cnt(find_sym_arr))
2249 find_sym = array_flatten_str(find_sym_arr);
2250 if (array_cnt(find_lib_arr))
2251 find_lib = array_flatten_str(find_lib_arr);
2252 if (array_cnt(find_section_arr))
2253 find_section = array_flatten_str(find_section_arr);
2254 /* let the format option override all other options */
2255 if (out_format) {
2256 show_pax = show_phdr = show_textrel = show_rpath = \
2257 show_needed = show_interp = show_bind = show_soname = \
2258 show_textrels = show_perms = show_endian = show_size = \
2259 show_osabi = show_eabi = 0;
2260 for (i = 0; out_format[i]; ++i) {
2261 if (!IS_MODIFIER(out_format[i])) continue;
2262
2263 switch (out_format[++i]) {
2264 case '+': break;
2265 case '%': break;
2266 case '#': break;
2267 case 'F': break;
2268 case 'p': break;
2269 case 'f': break;
2270 case 'k': break;
2271 case 's': break;
2272 case 'N': break;
2273 case 'o': break;
2274 case 'a': break;
2275 case 'M': break;
2276 case 'Z': show_size = 1; break;
2277 case 'D': show_endian = 1; break;
2278 case 'I': show_osabi = 1; break;
2279 case 'Y': show_eabi = 1; break;
2280 case 'O': show_perms = 1; break;
2281 case 'x': show_pax = 1; break;
2282 case 'e': show_phdr = 1; break;
2283 case 't': show_textrel = 1; break;
2284 case 'r': show_rpath = 1; break;
2285 case 'n': show_needed = 1; break;
2286 case 'i': show_interp = 1; break;
2287 case 'b': show_bind = 1; break;
2288 case 'S': show_soname = 1; break;
2289 case 'T': show_textrels = 1; break;
2290 default:
2291 err("invalid format specifier '%c' (byte %i)",
2292 out_format[i], i+1);
2293 }
2294 }
2295
2296 /* construct our default format */
2297 } else {
2298 size_t fmt_len = 30;
2299 out_format = xmalloc(sizeof(char) * fmt_len);
2300 *out_format = '\0';
2301 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
2302 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
2303 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
2304 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
2305 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
2306 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
2307 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
2308 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
2309 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
2310 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
2311 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
2312 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
2313 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
2314 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
2315 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
2316 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
2317 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
2318 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
2319 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
2320 }
2321 if (be_verbose > 2) printf("Format: %s\n", out_format);
2322
2323 /* now lets actually do the scanning */
2324 if (load_cache_config)
2325 load_ld_cache_config(__PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
2326 if (scan_ldpath) scanelf_ldpath();
2327 if (scan_envpath) scanelf_envpath();
2328 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
2329 from_file = "-";
2330 if (from_file) {
2331 scanelf_from_file(from_file);
2332 from_file = *argv;
2333 }
2334 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
2335 err("Nothing to scan !?");
2336 while (optind < argc) {
2337 search_path = argv[optind++];
2338 ret = scanelf_dir(search_path);
2339 }
2340
2341 #ifdef __PAX_UTILS_CLEANUP
2342 /* clean up */
2343 xarrayfree(ldpaths);
2344 xarrayfree(find_sym_arr);
2345 xarrayfree(find_lib_arr);
2346 xarrayfree(find_section_arr);
2347 free(find_sym);
2348 free(find_lib);
2349 free(find_section);
2350 {
2351 size_t n;
2352 regex_t *preg;
2353 array_for_each(find_sym_regex_arr, n, preg)
2354 regfree(preg);
2355 xarrayfree(find_sym_regex_arr);
2356 }
2357
2358 if (ldcache != 0)
2359 munmap(ldcache, ldcache_size);
2360 #endif
2361
2362 return ret;
2363 }
2364
2365 static char **get_split_env(const char *envvar)
2366 {
2367 const char *delims = " \t\n";
2368 char **envvals = NULL;
2369 char *env, *s;
2370 int nentry;
2371
2372 if ((env = getenv(envvar)) == NULL)
2373 return NULL;
2374
2375 env = xstrdup(env);
2376 if (env == NULL)
2377 return NULL;
2378
2379 s = strtok(env, delims);
2380 if (s == NULL) {
2381 free(env);
2382 return NULL;
2383 }
2384
2385 nentry = 0;
2386 while (s != NULL) {
2387 ++nentry;
2388 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
2389 envvals[nentry-1] = s;
2390 s = strtok(NULL, delims);
2391 }
2392 envvals[nentry] = NULL;
2393
2394 /* don't want to free(env) as it contains the memory that backs
2395 * the envvals array of strings */
2396 return envvals;
2397 }
2398
2399 static void parseenv(void)
2400 {
2401 color_init(false);
2402 qa_textrels = get_split_env("QA_TEXTRELS");
2403 qa_execstack = get_split_env("QA_EXECSTACK");
2404 qa_wx_load = get_split_env("QA_WX_LOAD");
2405 }
2406
2407 #ifdef __PAX_UTILS_CLEANUP
2408 static void cleanup(void)
2409 {
2410 free(out_format);
2411 free(qa_textrels);
2412 free(qa_execstack);
2413 free(qa_wx_load);
2414 }
2415 #endif
2416
2417 int main(int argc, char *argv[])
2418 {
2419 int ret;
2420 if (argc < 2)
2421 usage(EXIT_FAILURE);
2422 parseenv();
2423 ret = parseargs(argc, argv);
2424 fclose(stdout);
2425 #ifdef __PAX_UTILS_CLEANUP
2426 cleanup();
2427 warn("The calls to add/delete heap should be off:\n"
2428 "\t- 1 due to the out_buffer not being freed in scanelf_fileat()\n"
2429 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
2430 #endif
2431 return ret;
2432 }
2433
2434 /* Match filename against entries in matchlist, return TRUE
2435 * if the file is listed */
2436 static int file_matches_list(const char *filename, char **matchlist)
2437 {
2438 char **file;
2439 char *match;
2440 char buf[__PAX_UTILS_PATH_MAX];
2441
2442 if (matchlist == NULL)
2443 return 0;
2444
2445 for (file = matchlist; *file != NULL; file++) {
2446 if (search_path) {
2447 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2448 match = buf;
2449 } else {
2450 match = *file;
2451 }
2452 if (fnmatch(match, filename, 0) == 0)
2453 return 1;
2454 }
2455 return 0;
2456 }

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