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Revision 1.251 - (show annotations) (download) (as text)
Sat Nov 10 09:43:00 2012 UTC (2 years ago) by vapier
Branch: MAIN
Changes since 1.250: +19 -2 lines
File MIME type: text/x-csrc
scanelf: use PT_INTERP if .interp could not be found

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 1.250 2012/11/04 08:25:41 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 1.250 2012/11/04 08:25:41 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 int max_pt_load;
325
326 if (!show_phdr) return NULL;
327
328 memcpy(ret, "--- --- ---\0", 12);
329
330 shown = 0;
331 multi_stack = multi_relro = multi_load = 0;
332 max_pt_load = elf_max_pt_load(elf);
333
334 #define NOTE_GNU_STACK ".note.GNU-stack"
335 #define SHOW_PHDR(B) \
336 if (elf->elf_class == ELFCLASS ## B) { \
337 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
338 Elf ## B ## _Off offset; \
339 uint32_t flags, check_flags; \
340 if (elf->phdr != NULL) { \
341 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
342 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
343 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
344 if (multi_stack++) \
345 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
346 if (file_matches_list(elf->filename, qa_execstack)) \
347 continue; \
348 found = found_phdr; \
349 offset = 0; \
350 check_flags = PF_X; \
351 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
352 if (multi_relro++) \
353 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
354 found = found_relro; \
355 offset = 4; \
356 check_flags = PF_X; \
357 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
358 if (EGET(ehdr->e_type) == ET_DYN || EGET(ehdr->e_type) == ET_EXEC) \
359 if (multi_load++ > max_pt_load) \
360 warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
361 if (file_matches_list(elf->filename, qa_wx_load)) \
362 continue; \
363 found = found_load; \
364 offset = 8; \
365 check_flags = PF_W|PF_X; \
366 } else \
367 continue; \
368 flags = EGET(phdr[i].p_flags); \
369 if (be_quiet && ((flags & check_flags) != check_flags)) \
370 continue; \
371 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
372 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
373 ret[3] = ret[7] = '!'; \
374 flags = EGET(phdr[i].p_flags); \
375 } \
376 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
377 *found = 1; \
378 ++shown; \
379 } \
380 } else if (elf->shdr != NULL) { \
381 /* no program headers which means this is prob an object file */ \
382 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
383 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
384 char *str; \
385 if ((void*)strtbl > elf->data_end) \
386 goto skip_this_shdr##B; \
387 check_flags = SHF_WRITE|SHF_EXECINSTR; \
388 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
389 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
390 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
391 str = elf->data + offset; \
392 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
393 if (!strcmp(str, NOTE_GNU_STACK)) { \
394 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
395 flags = EGET(shdr[i].sh_flags); \
396 if (be_quiet && ((flags & check_flags) != check_flags)) \
397 continue; \
398 ++*found_phdr; \
399 shown = 1; \
400 if (flags & SHF_WRITE) ret[0] = 'W'; \
401 if (flags & SHF_ALLOC) ret[1] = 'A'; \
402 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
403 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
404 break; \
405 } \
406 } \
407 skip_this_shdr##B: \
408 if (!multi_stack) { \
409 if (file_matches_list(elf->filename, qa_execstack)) \
410 return NULL; \
411 *found_phdr = 1; \
412 shown = 1; \
413 memcpy(ret, "!WX", 3); \
414 } \
415 } \
416 }
417 SHOW_PHDR(32)
418 SHOW_PHDR(64)
419
420 if (be_wewy_wewy_quiet || (be_quiet && !shown))
421 return NULL;
422 else
423 return ret;
424 }
425
426 /*
427 * See if this ELF contains a DT_TEXTREL tag in any of its
428 * PT_DYNAMIC sections.
429 */
430 static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
431 {
432 static const char *ret = "TEXTREL";
433 unsigned long i;
434
435 if (!show_textrel && !show_textrels) return NULL;
436
437 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
438
439 if (elf->phdr) {
440 #define SHOW_TEXTREL(B) \
441 if (elf->elf_class == ELFCLASS ## B) { \
442 Elf ## B ## _Dyn *dyn; \
443 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
444 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
445 Elf ## B ## _Off offset; \
446 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
447 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
448 offset = EGET(phdr[i].p_offset); \
449 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
450 dyn = DYN ## B (elf->vdata + offset); \
451 while (EGET(dyn->d_tag) != DT_NULL) { \
452 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
453 *found_textrel = 1; \
454 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
455 return (be_wewy_wewy_quiet ? NULL : ret); \
456 } \
457 ++dyn; \
458 } \
459 } }
460 SHOW_TEXTREL(32)
461 SHOW_TEXTREL(64)
462 }
463
464 if (be_quiet || be_wewy_wewy_quiet)
465 return NULL;
466 else
467 return " - ";
468 }
469
470 /*
471 * Scan the .text section to see if there are any relocations in it.
472 * Should rewrite this to check PT_LOAD sections that are marked
473 * Executable rather than the section named '.text'.
474 */
475 static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
476 {
477 unsigned long s, r, rmax;
478 void *symtab_void, *strtab_void, *text_void;
479
480 if (!show_textrels) return NULL;
481
482 /* don't search for TEXTREL's if the ELF doesn't have any */
483 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
484 if (!*found_textrel) return NULL;
485
486 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
487 text_void = elf_findsecbyname(elf, ".text");
488
489 if (symtab_void && strtab_void && text_void && elf->shdr) {
490 #define SHOW_TEXTRELS(B) \
491 if (elf->elf_class == ELFCLASS ## B) { \
492 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
493 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
494 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
495 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
496 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
497 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
498 uint ## B ## _t memsz = EGET(text->sh_size); \
499 Elf ## B ## _Rel *rel; \
500 Elf ## B ## _Rela *rela; \
501 /* search the section headers for relocations */ \
502 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
503 uint32_t sh_type = EGET(shdr[s].sh_type); \
504 if (sh_type == SHT_REL) { \
505 rel = REL ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
506 rela = NULL; \
507 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
508 } else if (sh_type == SHT_RELA) { \
509 rel = NULL; \
510 rela = RELA ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
511 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
512 } else \
513 continue; \
514 /* now see if any of the relocs are in the .text */ \
515 for (r = 0; r < rmax; ++r) { \
516 unsigned long sym_max; \
517 Elf ## B ## _Addr offset_tmp; \
518 Elf ## B ## _Sym *func; \
519 Elf ## B ## _Sym *sym; \
520 Elf ## B ## _Addr r_offset; \
521 uint ## B ## _t r_info; \
522 if (sh_type == SHT_REL) { \
523 r_offset = EGET(rel[r].r_offset); \
524 r_info = EGET(rel[r].r_info); \
525 } else { \
526 r_offset = EGET(rela[r].r_offset); \
527 r_info = EGET(rela[r].r_info); \
528 } \
529 /* make sure this relocation is inside of the .text */ \
530 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
531 if (be_verbose <= 2) continue; \
532 } else \
533 *found_textrels = 1; \
534 /* locate this relocation symbol name */ \
535 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
536 if ((void*)sym > elf->data_end) { \
537 warn("%s: corrupt ELF symbol", elf->filename); \
538 continue; \
539 } \
540 sym_max = ELF ## B ## _R_SYM(r_info); \
541 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
542 sym += sym_max; \
543 else \
544 sym = NULL; \
545 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
546 /* show the raw details about this reloc */ \
547 printf(" %s: ", elf->base_filename); \
548 if (sym && sym->st_name) \
549 printf("%s", elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
550 else \
551 printf("(memory/data?)"); \
552 printf(" [0x%lX]", (unsigned long)r_offset); \
553 /* now try to find the closest symbol that this rel is probably in */ \
554 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
555 func = NULL; \
556 offset_tmp = 0; \
557 while (sym_max--) { \
558 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
559 func = sym; \
560 offset_tmp = EGET(sym->st_value); \
561 } \
562 ++sym; \
563 } \
564 printf(" in "); \
565 if (func && func->st_name) { \
566 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
567 if (r_offset > EGET(func->st_size)) \
568 printf("(optimized out: previous %s)", func_name); \
569 else \
570 printf("%s", func_name); \
571 } else \
572 printf("(optimized out)"); \
573 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
574 if (be_verbose && has_objdump) { \
575 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
576 char *sysbuf; \
577 size_t syslen; \
578 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"; \
579 syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
580 sysbuf = xmalloc(syslen); \
581 if (end_addr < r_offset) \
582 /* not uncommon when things are optimized out */ \
583 end_addr = r_offset + 0x100; \
584 snprintf(sysbuf, syslen, sysfmt, \
585 (unsigned long)offset_tmp, \
586 (unsigned long)end_addr, \
587 elf->filename, \
588 (unsigned long)r_offset); \
589 fflush(stdout); \
590 if (system(sysbuf)) /* don't care */; \
591 fflush(stdout); \
592 free(sysbuf); \
593 } \
594 } \
595 } }
596 SHOW_TEXTRELS(32)
597 SHOW_TEXTRELS(64)
598 }
599 if (!*found_textrels)
600 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
601
602 return NULL;
603 }
604
605 static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
606 {
607 struct stat st;
608 switch (*item) {
609 case '/': break;
610 case '.':
611 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
612 break;
613 case ':':
614 case '\0':
615 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
616 break;
617 case '$':
618 if (fstat(elf->fd, &st) != -1)
619 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
620 warnf("Security problem with %s='%s' in %s with mode set of %o",
621 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
622 break;
623 default:
624 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
625 break;
626 }
627 }
628 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
629 {
630 unsigned long i;
631 char *rpath, *runpath, **r;
632 void *strtbl_void;
633
634 if (!show_rpath) return;
635
636 strtbl_void = elf_findsecbyname(elf, ".dynstr");
637 rpath = runpath = NULL;
638
639 if (elf->phdr && strtbl_void) {
640 #define SHOW_RPATH(B) \
641 if (elf->elf_class == ELFCLASS ## B) { \
642 Elf ## B ## _Dyn *dyn; \
643 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
644 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
645 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
646 Elf ## B ## _Off offset; \
647 Elf ## B ## _Xword word; \
648 /* Scan all the program headers */ \
649 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
650 /* Just scan dynamic headers */ \
651 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
652 offset = EGET(phdr[i].p_offset); \
653 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
654 /* Just scan dynamic RPATH/RUNPATH headers */ \
655 dyn = DYN ## B (elf->vdata + offset); \
656 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
657 if (word == DT_RPATH) { \
658 r = &rpath; \
659 } else if (word == DT_RUNPATH) { \
660 r = &runpath; \
661 } else { \
662 ++dyn; \
663 continue; \
664 } \
665 /* Verify the memory is somewhat sane */ \
666 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
667 if (offset < (Elf ## B ## _Off)elf->len) { \
668 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
669 *r = elf->data + offset; \
670 /* cache the length in case we need to nuke this section later on */ \
671 if (fix_elf) \
672 offset = strlen(*r); \
673 /* If quiet, don't output paths in ld.so.conf */ \
674 if (be_quiet) { \
675 size_t len; \
676 char *start, *end; \
677 /* note that we only 'chop' off leading known paths. */ \
678 /* since *r is read-only memory, we can only move the ptr forward. */ \
679 start = *r; \
680 /* scan each path in : delimited list */ \
681 while (start) { \
682 rpath_security_checks(elf, start, get_elfdtype(word)); \
683 end = strchr(start, ':'); \
684 len = (end ? abs(end - start) : strlen(start)); \
685 if (use_ldcache) { \
686 size_t n; \
687 const char *ldpath; \
688 array_for_each(ldpaths, n, ldpath) \
689 if (!strncmp(ldpath, start, len) && !ldpath[len]) { \
690 *r = end; \
691 /* corner case ... if RPATH reads "/usr/lib:", we want \
692 * to show ':' rather than '' */ \
693 if (end && end[1] != '\0') \
694 (*r)++; \
695 break; \
696 } \
697 } \
698 if (!*r || !end) \
699 break; \
700 else \
701 start = start + len + 1; \
702 } \
703 } \
704 if (*r) { \
705 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
706 /* just nuke it */ \
707 nuke_it##B: \
708 memset(*r, 0x00, offset); \
709 *r = NULL; \
710 ESET(dyn->d_tag, DT_DEBUG); \
711 ESET(dyn->d_un.d_ptr, 0); \
712 } else if (fix_elf) { \
713 /* try to clean "bad" paths */ \
714 size_t len, tmpdir_len; \
715 char *start, *end; \
716 const char *tmpdir; \
717 start = *r; \
718 tmpdir = (getenv("TMPDIR") ? : "."); \
719 tmpdir_len = strlen(tmpdir); \
720 while (1) { \
721 end = strchr(start, ':'); \
722 if (start == end) { \
723 eat_this_path##B: \
724 len = strlen(end); \
725 memmove(start, end+1, len); \
726 start[len-1] = '\0'; \
727 end = start - 1; \
728 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
729 if (!end) { \
730 if (start == *r) \
731 goto nuke_it##B; \
732 *--start = '\0'; \
733 } else \
734 goto eat_this_path##B; \
735 } \
736 if (!end) \
737 break; \
738 start = end + 1; \
739 } \
740 if (**r == '\0') \
741 goto nuke_it##B; \
742 } \
743 if (*r) \
744 *found_rpath = 1; \
745 } \
746 } \
747 ++dyn; \
748 } \
749 } }
750 SHOW_RPATH(32)
751 SHOW_RPATH(64)
752 }
753
754 if (be_wewy_wewy_quiet) return;
755
756 if (rpath && runpath) {
757 if (!strcmp(rpath, runpath)) {
758 xstrcat(ret, runpath, ret_len);
759 } else {
760 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
761 xchrcat(ret, '{', ret_len);
762 xstrcat(ret, rpath, ret_len);
763 xchrcat(ret, ',', ret_len);
764 xstrcat(ret, runpath, ret_len);
765 xchrcat(ret, '}', ret_len);
766 }
767 } else if (rpath || runpath)
768 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
769 else if (!be_quiet)
770 xstrcat(ret, " - ", ret_len);
771 }
772
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
792 #if defined(__GLIBC__) || defined(__UCLIBC__)
793
794 static char *lookup_cache_lib(elfobj *elf, const char *fname)
795 {
796 int fd;
797 char *strs;
798 static char buf[__PAX_UTILS_PATH_MAX] = "";
799 const char *cachefile = root_rel_path("/etc/ld.so.cache");
800 struct stat st;
801
802 typedef struct {
803 char magic[LDSO_CACHE_MAGIC_LEN];
804 char version[LDSO_CACHE_VER_LEN];
805 int nlibs;
806 } header_t;
807 header_t *header;
808
809 typedef struct {
810 int flags;
811 int sooffset;
812 int liboffset;
813 } libentry_t;
814 libentry_t *libent;
815
816 if (fname == NULL)
817 return NULL;
818
819 if (ldcache == NULL) {
820 if (fstatat(root_fd, cachefile, &st, 0))
821 return NULL;
822
823 fd = openat(root_fd, cachefile, O_RDONLY);
824 if (fd == -1)
825 return NULL;
826
827 /* cache these values so we only map/unmap the cache file once */
828 ldcache_size = st.st_size;
829 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
830 close(fd);
831
832 if (ldcache == MAP_FAILED) {
833 ldcache = NULL;
834 return NULL;
835 }
836
837 if (memcmp(header->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN) ||
838 memcmp(header->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
839 {
840 munmap(ldcache, ldcache_size);
841 ldcache = NULL;
842 return NULL;
843 }
844 } else
845 header = ldcache;
846
847 libent = ldcache + sizeof(header_t);
848 strs = (char *) &libent[header->nlibs];
849
850 for (fd = 0; fd < header->nlibs; ++fd) {
851 /* This should be more fine grained, but for now we assume that
852 * diff arches will not be cached together, and we ignore the
853 * the different multilib mips cases.
854 */
855 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
856 continue;
857 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
858 continue;
859
860 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
861 continue;
862
863 /* Return first hit because that is how the ldso rolls */
864 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
865 break;
866 }
867
868 return buf;
869 }
870
871 #elif defined(__NetBSD__)
872 static char *lookup_cache_lib(elfobj *elf, const char *fname)
873 {
874 static char buf[__PAX_UTILS_PATH_MAX] = "";
875 static struct stat st;
876 size_t n;
877 char *ldpath;
878
879 array_for_each(ldpath, n, ldpath) {
880 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", ldpath, fname) >= sizeof(buf))
881 continue; /* if the pathname is too long, or something went wrong, ignore */
882
883 if (stat(buf, &st) != 0)
884 continue; /* if the lib doesn't exist in *ldpath, look further */
885
886 /* NetBSD doesn't actually do sanity checks, it just loads the file
887 * and if that doesn't work, continues looking in other directories.
888 * This cannot easily be safely emulated, unfortunately. For now,
889 * just assume that if it exists, it's a valid library. */
890
891 return buf;
892 }
893
894 /* not found in any path */
895 return NULL;
896 }
897 #else
898 #ifdef __ELF__
899 #warning Cache support not implemented for your target
900 #endif
901 static char *lookup_cache_lib(elfobj *elf, const char *fname)
902 {
903 return NULL;
904 }
905 #endif
906
907 static char *lookup_config_lib(elfobj *elf, char *fname)
908 {
909 static char buf[__PAX_UTILS_PATH_MAX] = "";
910 const char *ldpath;
911 size_t n;
912
913 array_for_each(ldpaths, n, ldpath) {
914 snprintf(buf, sizeof(buf), "%s/%s", root_rel_path(ldpath), fname);
915 if (faccessat(root_fd, buf, F_OK, AT_SYMLINK_NOFOLLOW) == 0)
916 return buf;
917 }
918
919 return NULL;
920 }
921
922 static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
923 {
924 unsigned long i;
925 char *needed;
926 void *strtbl_void;
927 char *p;
928
929 /*
930 * -n -> op==0 -> print all
931 * -N -> op==1 -> print requested
932 */
933 if ((op == 0 && !show_needed) || (op == 1 && !find_lib))
934 return NULL;
935
936 strtbl_void = elf_findsecbyname(elf, ".dynstr");
937
938 if (elf->phdr && strtbl_void) {
939 #define SHOW_NEEDED(B) \
940 if (elf->elf_class == ELFCLASS ## B) { \
941 Elf ## B ## _Dyn *dyn; \
942 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
943 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
944 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
945 Elf ## B ## _Off offset; \
946 size_t matched = 0; \
947 /* Walk all the program headers to find the PT_DYNAMIC */ \
948 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
949 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) \
950 continue; \
951 offset = EGET(phdr[i].p_offset); \
952 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
953 continue; \
954 /* Walk all the dynamic tags to find NEEDED entries */ \
955 dyn = DYN ## B (elf->vdata + offset); \
956 while (EGET(dyn->d_tag) != DT_NULL) { \
957 if (EGET(dyn->d_tag) == DT_NEEDED) { \
958 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
959 if (offset >= (Elf ## B ## _Off)elf->len) { \
960 ++dyn; \
961 continue; \
962 } \
963 needed = elf->data + offset; \
964 if (op == 0) { \
965 /* -n -> print all entries */ \
966 if (!be_wewy_wewy_quiet) { \
967 if (*found_needed) xchrcat(ret, ',', ret_len); \
968 if (use_ldpath) { \
969 if ((p = lookup_config_lib(elf, needed)) != NULL) \
970 needed = p; \
971 } else if (use_ldcache) { \
972 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
973 needed = p; \
974 } \
975 xstrcat(ret, needed, ret_len); \
976 } \
977 *found_needed = 1; \
978 } else { \
979 /* -N -> print matching entries */ \
980 size_t n; \
981 const char *find_lib_name; \
982 \
983 array_for_each(find_lib_arr, n, find_lib_name) { \
984 int invert = 1; \
985 if (find_lib_name[0] == '!') \
986 invert = 0, ++find_lib_name; \
987 if (!strcmp(find_lib_name, needed) == invert) \
988 ++matched; \
989 } \
990 \
991 if (matched == array_cnt(find_lib_arr)) { \
992 *found_lib = 1; \
993 return (be_wewy_wewy_quiet ? NULL : find_lib); \
994 } \
995 } \
996 } \
997 ++dyn; \
998 } \
999 } }
1000 SHOW_NEEDED(32)
1001 SHOW_NEEDED(64)
1002 if (op == 0 && !*found_needed && be_verbose)
1003 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
1004 }
1005
1006 return NULL;
1007 }
1008 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
1009 {
1010 void *strtbl_void;
1011
1012 if (!show_interp) return NULL;
1013
1014 strtbl_void = elf_findsecbyname(elf, ".interp");
1015
1016 if (strtbl_void) {
1017 #define SHOW_INTERP(B) \
1018 if (elf->elf_class == ELFCLASS ## B) { \
1019 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
1020 *found_interp = 1; \
1021 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
1022 }
1023 SHOW_INTERP(32)
1024 SHOW_INTERP(64)
1025 } else {
1026 /* Walk all the program headers to find the PT_INTERP */
1027 #define SHOW_PT_INTERP(B) \
1028 if (elf->elf_class == ELFCLASS ## B) { \
1029 unsigned long i; \
1030 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1031 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1032 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1033 if (EGET(phdr[i].p_type) != PT_INTERP) \
1034 continue; \
1035 *found_interp = 1; \
1036 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(phdr[i].p_offset)); \
1037 } \
1038 }
1039 SHOW_PT_INTERP(32)
1040 SHOW_PT_INTERP(64)
1041 }
1042
1043 return NULL;
1044 }
1045 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
1046 {
1047 unsigned long i;
1048 struct stat s;
1049 char dynamic = 0;
1050
1051 if (!show_bind) return NULL;
1052 if (!elf->phdr) return NULL;
1053
1054 #define SHOW_BIND(B) \
1055 if (elf->elf_class == ELFCLASS ## B) { \
1056 Elf ## B ## _Dyn *dyn; \
1057 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1058 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1059 Elf ## B ## _Off offset; \
1060 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1061 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1062 dynamic = 1; \
1063 offset = EGET(phdr[i].p_offset); \
1064 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
1065 dyn = DYN ## B (elf->vdata + offset); \
1066 while (EGET(dyn->d_tag) != DT_NULL) { \
1067 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
1068 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
1069 { \
1070 if (be_quiet) return NULL; \
1071 *found_bind = 1; \
1072 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
1073 } \
1074 ++dyn; \
1075 } \
1076 } \
1077 }
1078 SHOW_BIND(32)
1079 SHOW_BIND(64)
1080
1081 if (be_wewy_wewy_quiet) return NULL;
1082
1083 /* don't output anything if quiet mode and the ELF is static or not setuid */
1084 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
1085 return NULL;
1086 } else {
1087 *found_bind = 1;
1088 return (char *)(dynamic ? "LAZY" : "STATIC");
1089 }
1090 }
1091 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
1092 {
1093 unsigned long i;
1094 char *soname;
1095 void *strtbl_void;
1096
1097 if (!show_soname) return NULL;
1098
1099 strtbl_void = elf_findsecbyname(elf, ".dynstr");
1100
1101 if (elf->phdr && strtbl_void) {
1102 #define SHOW_SONAME(B) \
1103 if (elf->elf_class == ELFCLASS ## B) { \
1104 Elf ## B ## _Dyn *dyn; \
1105 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1106 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1107 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
1108 Elf ## B ## _Off offset; \
1109 /* only look for soname in shared objects */ \
1110 if (EGET(ehdr->e_type) != ET_DYN) \
1111 return NULL; \
1112 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1113 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1114 offset = EGET(phdr[i].p_offset); \
1115 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
1116 dyn = DYN ## B (elf->vdata + offset); \
1117 while (EGET(dyn->d_tag) != DT_NULL) { \
1118 if (EGET(dyn->d_tag) == DT_SONAME) { \
1119 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
1120 if (offset >= (Elf ## B ## _Off)elf->len) { \
1121 ++dyn; \
1122 continue; \
1123 } \
1124 soname = elf->data + offset; \
1125 *found_soname = 1; \
1126 return (be_wewy_wewy_quiet ? NULL : soname); \
1127 } \
1128 ++dyn; \
1129 } \
1130 } }
1131 SHOW_SONAME(32)
1132 SHOW_SONAME(64)
1133 }
1134
1135 return NULL;
1136 }
1137
1138 /*
1139 * We support the symbol form:
1140 * [%[modifiers]%][[+-]<symbol name>][,[.....]]
1141 * If the symbol name is empty, then all symbols are matched.
1142 * If the symbol name is a glob ("*"), then all symbols are dumped (debug).
1143 * Do not rely on this output format at all.
1144 * Otherwise the symbol name is used to search (either regex or string compare).
1145 * If the first char of the symbol name is a plus ("+"), then only match
1146 * defined symbols. If it's a minus ("-"), only match undefined symbols.
1147 * Putting modifiers in between the percent signs allows for more in depth
1148 * filters. There are groups of modifiers. If you don't specify a member
1149 * of a group, then all types in that group are matched. The current
1150 * groups and their types are:
1151 * STT group: STT_NOTYPE:n STT_OBJECT:o STT_FUNC:f STT_FILE:F
1152 * STB group: STB_LOCAL:l STB_GLOBAL:g STB_WEAK:w
1153 * SHN group: SHN_UNDEF:u SHN_ABS:a SHN_COMMON:c {defined}:d
1154 * The "defined" value in the SHN group does not correspond to a SHN_xxx define.
1155 * You can search for multiple symbols at once by seperating with a comma (",").
1156 *
1157 * Some examples:
1158 * ELFs with a weak function "foo":
1159 * scanelf -s %wf%foo <ELFs>
1160 * ELFs that define the symbol "main":
1161 * scanelf -s +main <ELFs>
1162 * scanelf -s %d%main <ELFs>
1163 * ELFs that refer to the undefined symbol "brk":
1164 * scanelf -s -brk <ELFs>
1165 * scanelf -s %u%brk <ELFs>
1166 * All global defined objects in an ELF:
1167 * scanelf -s %ogd% <ELF>
1168 */
1169 static void
1170 scanelf_match_symname(elfobj *elf, char *found_sym, char **ret, size_t *ret_len, const char *symname,
1171 unsigned int stt, unsigned int stb, unsigned int shn, unsigned long size)
1172 {
1173 const char *this_sym;
1174 size_t n;
1175
1176 array_for_each(find_sym_arr, n, this_sym) {
1177 bool 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
1181 /* symbol selection! */
1182 inc_notype = inc_object = inc_func = inc_file = \
1183 inc_local = inc_global = inc_weak = \
1184 inc_def = inc_undef = inc_abs = inc_common = \
1185 (*this_sym != '%');
1186
1187 /* parse the contents of %...% */
1188 if (!inc_notype) {
1189 while (*(this_sym++)) {
1190 if (*this_sym == '%') {
1191 ++this_sym;
1192 break;
1193 }
1194 switch (*this_sym) {
1195 case 'n': inc_notype = true; break;
1196 case 'o': inc_object = true; break;
1197 case 'f': inc_func = true; break;
1198 case 'F': inc_file = true; break;
1199 case 'l': inc_local = true; break;
1200 case 'g': inc_global = true; break;
1201 case 'w': inc_weak = true; break;
1202 case 'd': inc_def = true; break;
1203 case 'u': inc_undef = true; break;
1204 case 'a': inc_abs = true; break;
1205 case 'c': inc_common = true; break;
1206 default: err("invalid symbol selector '%c'", *this_sym);
1207 }
1208 }
1209
1210 /* If no types are matched, not match all */
1211 if (!inc_notype && !inc_object && !inc_func && !inc_file)
1212 inc_notype = inc_object = inc_func = inc_file = true;
1213 if (!inc_local && !inc_global && !inc_weak)
1214 inc_local = inc_global = inc_weak = true;
1215 if (!inc_def && !inc_undef && !inc_abs && !inc_common)
1216 inc_def = inc_undef = inc_abs = inc_common = true;
1217
1218 /* backwards compat for defined/undefined short hand */
1219 } else if (*this_sym == '+') {
1220 inc_undef = false;
1221 ++this_sym;
1222 } else if (*this_sym == '-') {
1223 inc_def = inc_abs = inc_common = false;
1224 ++this_sym;
1225 }
1226
1227 /* filter symbols */
1228 if ((!inc_notype && stt == STT_NOTYPE) || \
1229 (!inc_object && stt == STT_OBJECT) || \
1230 (!inc_func && stt == STT_FUNC ) || \
1231 (!inc_file && stt == STT_FILE ) || \
1232 (!inc_local && stb == STB_LOCAL ) || \
1233 (!inc_global && stb == STB_GLOBAL) || \
1234 (!inc_weak && stb == STB_WEAK ) || \
1235 (!inc_def && shn && shn < SHN_LORESERVE) || \
1236 (!inc_undef && shn == SHN_UNDEF ) || \
1237 (!inc_abs && shn == SHN_ABS ) || \
1238 (!inc_common && shn == SHN_COMMON))
1239 continue;
1240
1241 if (*this_sym == '*') {
1242 /* a "*" symbol gets you debug output */
1243 printf("%s(%s) %5lX %15s %15s %15s %s\n",
1244 ((*found_sym == 0) ? "\n\t" : "\t"),
1245 elf->base_filename,
1246 size,
1247 get_elfstttype(stt),
1248 get_elfstbtype(stb),
1249 get_elfshntype(shn),
1250 symname);
1251 goto matched;
1252
1253 } else {
1254 if (g_match) {
1255 /* regex match the symbol */
1256 if (regexec(find_sym_regex_arr->eles[n], symname, 0, NULL, 0) == REG_NOMATCH)
1257 continue;
1258
1259 } else if (*this_sym) {
1260 /* give empty symbols a "pass", else do a normal compare */
1261 const size_t len = strlen(this_sym);
1262 if (!(strncmp(this_sym, symname, len) == 0 &&
1263 /* Accept unversioned symbol names */
1264 (symname[len] == '\0' || symname[len] == '@')))
1265 continue;
1266 }
1267
1268 if (be_semi_verbose) {
1269 char buf[1024];
1270 snprintf(buf, sizeof(buf), "%lX %s %s",
1271 size,
1272 get_elfstttype(stt),
1273 this_sym);
1274 *ret = xstrdup(buf);
1275 } else {
1276 if (*ret) xchrcat(ret, ',', ret_len);
1277 xstrcat(ret, symname, ret_len);
1278 }
1279
1280 goto matched;
1281 }
1282 }
1283
1284 return;
1285
1286 matched:
1287 *found_sym = 1;
1288 }
1289
1290 static const char *scanelf_file_sym(elfobj *elf, char *found_sym)
1291 {
1292 char *ret;
1293 void *symtab_void, *strtab_void;
1294
1295 if (!find_sym) return NULL;
1296 ret = NULL;
1297
1298 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
1299
1300 if (symtab_void && strtab_void) {
1301 #define FIND_SYM(B) \
1302 if (elf->elf_class == ELFCLASS ## B) { \
1303 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
1304 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
1305 Elf ## B ## _Sym *sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
1306 Elf ## B ## _Word i, cnt = EGET(symtab->sh_entsize); \
1307 char *symname; \
1308 size_t ret_len = 0; \
1309 if (cnt) \
1310 cnt = EGET(symtab->sh_size) / cnt; \
1311 for (i = 0; i < cnt; ++i) { \
1312 if ((void*)sym > elf->data_end) { \
1313 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1314 goto break_out; \
1315 } \
1316 if (sym->st_name) { \
1317 /* make sure the symbol name is in acceptable memory range */ \
1318 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
1319 if ((void*)symname > elf->data_end) { \
1320 warnf("%s: corrupt ELF symbols", elf->filename); \
1321 ++sym; \
1322 continue; \
1323 } \
1324 scanelf_match_symname(elf, found_sym, \
1325 &ret, &ret_len, symname, \
1326 ELF##B##_ST_TYPE(EGET(sym->st_info)), \
1327 ELF##B##_ST_BIND(EGET(sym->st_info)), \
1328 EGET(sym->st_shndx), \
1329 /* st_size can be 64bit, but no one is really that big, so screw em */ \
1330 EGET(sym->st_size)); \
1331 } \
1332 ++sym; \
1333 } \
1334 }
1335 FIND_SYM(32)
1336 FIND_SYM(64)
1337 }
1338
1339 break_out:
1340 if (be_wewy_wewy_quiet) return NULL;
1341
1342 if (*find_sym != '*' && *found_sym)
1343 return ret;
1344 if (be_quiet)
1345 return NULL;
1346 else
1347 return " - ";
1348 }
1349
1350 static const char *scanelf_file_sections(elfobj *elf, char *found_section)
1351 {
1352 if (!find_section)
1353 return NULL;
1354
1355 #define FIND_SECTION(B) \
1356 if (elf->elf_class == ELFCLASS ## B) { \
1357 size_t matched, n; \
1358 int invert; \
1359 const char *section_name; \
1360 Elf ## B ## _Shdr *section; \
1361 \
1362 matched = 0; \
1363 array_for_each(find_section_arr, n, section_name) { \
1364 invert = (*section_name == '!' ? 1 : 0); \
1365 section = SHDR ## B (elf_findsecbyname(elf, section_name + invert)); \
1366 if ((section == NULL && invert) || (section != NULL && !invert)) \
1367 ++matched; \
1368 } \
1369 \
1370 if (matched == array_cnt(find_section_arr)) \
1371 *found_section = 1; \
1372 }
1373 FIND_SECTION(32)
1374 FIND_SECTION(64)
1375
1376 if (be_wewy_wewy_quiet)
1377 return NULL;
1378
1379 if (*found_section)
1380 return find_section;
1381
1382 if (be_quiet)
1383 return NULL;
1384 else
1385 return " - ";
1386 }
1387
1388 /* scan an elf file and show all the fun stuff */
1389 #define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
1390 static int scanelf_elfobj(elfobj *elf)
1391 {
1392 unsigned long i;
1393 char found_pax, found_phdr, found_relro, found_load, found_textrel,
1394 found_rpath, found_needed, found_interp, found_bind, found_soname,
1395 found_sym, found_lib, found_file, found_textrels, found_section;
1396 static char *out_buffer = NULL;
1397 static size_t out_len;
1398
1399 found_pax = found_phdr = found_relro = found_load = found_textrel = \
1400 found_rpath = found_needed = found_interp = found_bind = found_soname = \
1401 found_sym = found_lib = found_file = found_textrels = found_section = 0;
1402
1403 if (be_verbose > 2)
1404 printf("%s: scanning file {%s,%s}\n", elf->filename,
1405 get_elfeitype(EI_CLASS, elf->elf_class),
1406 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
1407 else if (be_verbose > 1)
1408 printf("%s: scanning file\n", elf->filename);
1409
1410 /* init output buffer */
1411 if (!out_buffer) {
1412 out_len = sizeof(char) * 80;
1413 out_buffer = xmalloc(out_len);
1414 }
1415 *out_buffer = '\0';
1416
1417 /* show the header */
1418 if (!be_quiet && show_banner) {
1419 for (i = 0; out_format[i]; ++i) {
1420 if (!IS_MODIFIER(out_format[i])) continue;
1421
1422 switch (out_format[++i]) {
1423 case '+': break;
1424 case '%': break;
1425 case '#': break;
1426 case 'F':
1427 case 'p':
1428 case 'f': prints("FILE "); found_file = 1; break;
1429 case 'o': prints(" TYPE "); break;
1430 case 'x': prints(" PAX "); break;
1431 case 'e': prints("STK/REL/PTL "); break;
1432 case 't': prints("TEXTREL "); break;
1433 case 'r': prints("RPATH "); break;
1434 case 'M': prints("CLASS "); break;
1435 case 'l':
1436 case 'n': prints("NEEDED "); break;
1437 case 'i': prints("INTERP "); break;
1438 case 'b': prints("BIND "); break;
1439 case 'Z': prints("SIZE "); break;
1440 case 'S': prints("SONAME "); break;
1441 case 's': prints("SYM "); break;
1442 case 'N': prints("LIB "); break;
1443 case 'T': prints("TEXTRELS "); break;
1444 case 'k': prints("SECTION "); break;
1445 case 'a': prints("ARCH "); break;
1446 case 'I': prints("OSABI "); break;
1447 case 'Y': prints("EABI "); break;
1448 case 'O': prints("PERM "); break;
1449 case 'D': prints("ENDIAN "); break;
1450 default: warnf("'%c' has no title ?", out_format[i]);
1451 }
1452 }
1453 if (!found_file) prints("FILE ");
1454 prints("\n");
1455 found_file = 0;
1456 show_banner = 0;
1457 }
1458
1459 /* dump all the good stuff */
1460 for (i = 0; out_format[i]; ++i) {
1461 const char *out;
1462 const char *tmp;
1463 static char ubuf[sizeof(unsigned long)*2];
1464 if (!IS_MODIFIER(out_format[i])) {
1465 xchrcat(&out_buffer, out_format[i], &out_len);
1466 continue;
1467 }
1468
1469 out = NULL;
1470 be_wewy_wewy_quiet = (out_format[i] == '#');
1471 be_semi_verbose = (out_format[i] == '+');
1472 switch (out_format[++i]) {
1473 case '+':
1474 case '%':
1475 case '#':
1476 xchrcat(&out_buffer, out_format[i], &out_len); break;
1477 case 'F':
1478 found_file = 1;
1479 if (be_wewy_wewy_quiet) break;
1480 xstrcat(&out_buffer, elf->filename, &out_len);
1481 break;
1482 case 'p':
1483 found_file = 1;
1484 if (be_wewy_wewy_quiet) break;
1485 tmp = elf->filename;
1486 if (search_path) {
1487 ssize_t len_search = strlen(search_path);
1488 ssize_t len_file = strlen(elf->filename);
1489 if (!strncmp(elf->filename, search_path, len_search) && \
1490 len_file > len_search)
1491 tmp += len_search;
1492 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1493 }
1494 xstrcat(&out_buffer, tmp, &out_len);
1495 break;
1496 case 'f':
1497 found_file = 1;
1498 if (be_wewy_wewy_quiet) break;
1499 tmp = strrchr(elf->filename, '/');
1500 tmp = (tmp == NULL ? elf->filename : tmp+1);
1501 xstrcat(&out_buffer, tmp, &out_len);
1502 break;
1503 case 'o': out = get_elfetype(elf); break;
1504 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
1505 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
1506 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1507 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
1508 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1509 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1510 case 'D': out = get_endian(elf); break;
1511 case 'O': out = strfileperms(elf->filename); break;
1512 case 'n':
1513 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
1514 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1515 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1516 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
1517 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1518 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1519 case 'a': out = get_elfemtype(elf); break;
1520 case 'I': out = get_elfosabi(elf); break;
1521 case 'Y': out = get_elf_eabi(elf); break;
1522 case 'Z': snprintf(ubuf, sizeof(ubuf), "%lu", (unsigned long)elf->len); out = ubuf; break;;
1523 default: warnf("'%c' has no scan code?", out_format[i]);
1524 }
1525 if (out)
1526 xstrcat(&out_buffer, out, &out_len);
1527 }
1528
1529 #define FOUND_SOMETHING() \
1530 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1531 found_rpath || found_needed || found_interp || found_bind || \
1532 found_soname || found_sym || found_lib || found_textrels || found_section )
1533
1534 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1535 xchrcat(&out_buffer, ' ', &out_len);
1536 xstrcat(&out_buffer, elf->filename, &out_len);
1537 }
1538 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
1539 puts(out_buffer);
1540 fflush(stdout);
1541 }
1542
1543 return 0;
1544 }
1545
1546 /* scan a single elf */
1547 static int scanelf_elf(const char *filename, int fd, size_t len)
1548 {
1549 int ret = 1;
1550 elfobj *elf;
1551
1552 /* verify this is real ELF */
1553 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1554 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1555 return 2;
1556 }
1557 switch (match_bits) {
1558 case 32:
1559 if (elf->elf_class != ELFCLASS32)
1560 goto label_done;
1561 break;
1562 case 64:
1563 if (elf->elf_class != ELFCLASS64)
1564 goto label_done;
1565 break;
1566 default: break;
1567 }
1568 if (match_etypes) {
1569 char sbuf[126];
1570 strncpy(sbuf, match_etypes, sizeof(sbuf));
1571 if (strchr(match_etypes, ',') != NULL) {
1572 char *p;
1573 while ((p = strrchr(sbuf, ',')) != NULL) {
1574 *p = 0;
1575 if (etype_lookup(p+1) == get_etype(elf))
1576 goto label_ret;
1577 }
1578 }
1579 if (etype_lookup(sbuf) != get_etype(elf))
1580 goto label_done;
1581 }
1582
1583 label_ret:
1584 ret = scanelf_elfobj(elf);
1585
1586 label_done:
1587 unreadelf(elf);
1588 return ret;
1589 }
1590
1591 /* scan an archive of elfs */
1592 static int scanelf_archive(const char *filename, int fd, size_t len)
1593 {
1594 archive_handle *ar;
1595 archive_member *m;
1596 char *ar_buffer;
1597 elfobj *elf;
1598
1599 ar = ar_open_fd(filename, fd);
1600 if (ar == NULL)
1601 return 1;
1602
1603 ar_buffer = mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1604 while ((m = ar_next(ar)) != NULL) {
1605 off_t cur_pos = lseek(fd, 0, SEEK_CUR);
1606 if (cur_pos == -1)
1607 errp("lseek() failed");
1608 elf = readelf_buffer(m->name, ar_buffer + cur_pos, m->size);
1609 if (elf) {
1610 scanelf_elfobj(elf);
1611 unreadelf(elf);
1612 }
1613 }
1614 munmap(ar_buffer, len);
1615
1616 return 0;
1617 }
1618 /* scan a file which may be an elf or an archive or some other magical beast */
1619 static int scanelf_fileat(int dir_fd, const char *filename, const struct stat *st_cache)
1620 {
1621 const struct stat *st = st_cache;
1622 struct stat symlink_st;
1623 int fd;
1624
1625 /* always handle regular files and handle symlinked files if no -y */
1626 if (S_ISLNK(st->st_mode)) {
1627 if (!scan_symlink)
1628 return 1;
1629 fstatat(dir_fd, filename, &symlink_st, 0);
1630 st = &symlink_st;
1631 }
1632
1633 if (!S_ISREG(st->st_mode)) {
1634 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1635 return 1;
1636 }
1637
1638 if (match_perms) {
1639 if ((st->st_mode | match_perms) != st->st_mode)
1640 return 1;
1641 }
1642 fd = openat(dir_fd, filename, (fix_elf ? O_RDWR : O_RDONLY) | O_CLOEXEC);
1643 if (fd == -1) {
1644 if (fix_elf && errno == ETXTBSY)
1645 warnp("%s: could not fix", filename);
1646 else if (be_verbose > 2)
1647 printf("%s: skipping file: %s\n", filename, strerror(errno));
1648 return 1;
1649 }
1650
1651 if (scanelf_elf(filename, fd, st->st_size) == 2) {
1652 /* if it isn't an ELF, maybe it's an .a archive */
1653 if (scan_archives)
1654 scanelf_archive(filename, fd, st->st_size);
1655
1656 /*
1657 * unreadelf() implicitly closes its fd, so only close it
1658 * when we are returning it in the non-ELF case
1659 */
1660 close(fd);
1661 }
1662
1663 return 0;
1664 }
1665
1666 /* scan a directory for ET_EXEC files and print when we find one */
1667 static int scanelf_dirat(int dir_fd, const char *path)
1668 {
1669 register DIR *dir;
1670 register struct dirent *dentry;
1671 struct stat st_top, st;
1672 char buf[__PAX_UTILS_PATH_MAX], *subpath;
1673 size_t pathlen = 0, len = 0;
1674 int ret = 0;
1675 int subdir_fd;
1676
1677 /* make sure path exists */
1678 if (fstatat(dir_fd, path, &st_top, AT_SYMLINK_NOFOLLOW) == -1) {
1679 if (be_verbose > 2) printf("%s: does not exist\n", path);
1680 return 1;
1681 }
1682
1683 /* ok, if it isn't a directory, assume we can open it */
1684 if (!S_ISDIR(st_top.st_mode))
1685 return scanelf_fileat(dir_fd, path, &st_top);
1686
1687 /* now scan the dir looking for fun stuff */
1688 subdir_fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
1689 if (subdir_fd == -1)
1690 dir = NULL;
1691 else
1692 dir = fdopendir(subdir_fd);
1693 if (dir == NULL) {
1694 if (subdir_fd != -1)
1695 close(subdir_fd);
1696 warnfp("could not opendir(%s)", path);
1697 return 1;
1698 }
1699 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1700
1701 subpath = stpcpy(buf, path);
1702 if (subpath[-1] != '/')
1703 *subpath++ = '/';
1704 pathlen = subpath - buf;
1705 while ((dentry = readdir(dir))) {
1706 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1707 continue;
1708
1709 if (fstatat(subdir_fd, dentry->d_name, &st, AT_SYMLINK_NOFOLLOW) == -1)
1710 continue;
1711
1712 len = strlen(dentry->d_name);
1713 if (len + pathlen + 1 >= sizeof(buf)) {
1714 warnf("Skipping '%s%s': len > sizeof(buf); %zu > %zu\n",
1715 path, dentry->d_name, len + pathlen + 1, sizeof(buf));
1716 continue;
1717 }
1718 memcpy(subpath, dentry->d_name, len);
1719 subpath[len] = '\0';
1720
1721 if (S_ISREG(st.st_mode))
1722 ret = scanelf_fileat(dir_fd, buf, &st);
1723 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1724 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1725 ret = scanelf_dirat(dir_fd, buf);
1726 }
1727 }
1728 closedir(dir);
1729
1730 return ret;
1731 }
1732 static int scanelf_dir(const char *path)
1733 {
1734 return scanelf_dirat(root_fd, root_rel_path(path));
1735 }
1736
1737 static int scanelf_from_file(const char *filename)
1738 {
1739 FILE *fp;
1740 char *p, *path;
1741 size_t len;
1742 int ret;
1743
1744 if (strcmp(filename, "-") == 0)
1745 fp = stdin;
1746 else if ((fp = fopen(filename, "r")) == NULL)
1747 return 1;
1748
1749 path = NULL;
1750 len = 0;
1751 ret = 0;
1752 while (getline(&path, &len, fp) != -1) {
1753 if ((p = strchr(path, '\n')) != NULL)
1754 *p = 0;
1755 search_path = path;
1756 ret = scanelf_dir(path);
1757 }
1758 free(path);
1759
1760 if (fp != stdin)
1761 fclose(fp);
1762
1763 return ret;
1764 }
1765
1766 #if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1767
1768 static int _load_ld_cache_config(const char *fname)
1769 {
1770 FILE *fp = NULL;
1771 char *p, *path;
1772 size_t len;
1773 int curr_fd = -1;
1774
1775 fp = fopenat_r(root_fd, root_rel_path(fname));
1776 if (fp == NULL)
1777 return -1;
1778
1779 path = NULL;
1780 len = 0;
1781 while (getline(&path, &len, fp) != -1) {
1782 if ((p = strrchr(path, '\r')) != NULL)
1783 *p = 0;
1784 if ((p = strchr(path, '\n')) != NULL)
1785 *p = 0;
1786
1787 /* recursive includes of the same file will make this segfault. */
1788 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1789 glob_t gl;
1790 size_t x;
1791 const char *gpath;
1792
1793 /* re-use existing path buffer ... need to be creative */
1794 if (path[8] != '/')
1795 gpath = memcpy(path + 3, "/etc/", 5);
1796 else
1797 gpath = path + 8;
1798 if (root_fd != AT_FDCWD) {
1799 if (curr_fd == -1) {
1800 curr_fd = open(".", O_RDONLY|O_CLOEXEC);
1801 if (fchdir(root_fd))
1802 errp("unable to change to root dir");
1803 }
1804 gpath = root_rel_path(gpath);
1805 }
1806
1807 if (glob(gpath, 0, NULL, &gl) == 0) {
1808 for (x = 0; x < gl.gl_pathc; ++x) {
1809 /* try to avoid direct loops */
1810 if (strcmp(gl.gl_pathv[x], fname) == 0)
1811 continue;
1812 _load_ld_cache_config(gl.gl_pathv[x]);
1813 }
1814 globfree(&gl);
1815 }
1816
1817 /* failed globs are ignored by glibc */
1818 continue;
1819 }
1820
1821 if (*path != '/')
1822 continue;
1823
1824 xarraypush_str(ldpaths, path);
1825 }
1826 free(path);
1827
1828 fclose(fp);
1829
1830 if (curr_fd != -1) {
1831 if (fchdir(curr_fd))
1832 /* don't care */;
1833 close(curr_fd);
1834 }
1835
1836 return 0;
1837 }
1838
1839 #elif defined(__FreeBSD__) || defined(__DragonFly__)
1840
1841 static int _load_ld_cache_config(const char *fname)
1842 {
1843 FILE *fp = NULL;
1844 char *b = NULL, *p;
1845 struct elfhints_hdr hdr;
1846
1847 fp = fopenat_r(root_fd, root_rel_path(fname));
1848 if (fp == NULL)
1849 return -1;
1850
1851 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1852 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1853 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1854 {
1855 fclose(fp);
1856 return -1;
1857 }
1858
1859 b = xmalloc(hdr.dirlistlen + 1);
1860 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1861 fclose(fp);
1862 free(b);
1863 return -1;
1864 }
1865
1866 while ((p = strsep(&b, ":"))) {
1867 if (*p == '\0')
1868 continue;
1869 xarraypush_str(ldpaths, p);
1870 }
1871
1872 free(b);
1873 fclose(fp);
1874 return 0;
1875 }
1876
1877 #else
1878 #ifdef __ELF__
1879 #warning Cache config support not implemented for your target
1880 #endif
1881 static int _load_ld_cache_config(const char *fname)
1882 {
1883 return 0;
1884 }
1885 #endif
1886
1887 static void load_ld_cache_config(const char *fname)
1888 {
1889 bool scan_l, scan_ul, scan_ull;
1890 size_t n;
1891 const char *ldpath;
1892
1893 _load_ld_cache_config(fname);
1894
1895 scan_l = scan_ul = scan_ull = false;
1896 if (array_cnt(ldpaths)) {
1897 array_for_each(ldpaths, n, ldpath) {
1898 if (!scan_l && !strcmp(ldpath, "/lib")) scan_l = true;
1899 if (!scan_ul && !strcmp(ldpath, "/usr/lib")) scan_ul = true;
1900 if (!scan_ull && !strcmp(ldpath, "/usr/local/lib")) scan_ull = true;
1901 }
1902 }
1903
1904 if (!scan_l) xarraypush_str(ldpaths, "/lib");
1905 if (!scan_ul) xarraypush_str(ldpaths, "/usr/lib");
1906 if (!scan_ull) xarraypush_str(ldpaths, "/usr/local/lib");
1907 }
1908
1909 /* scan /etc/ld.so.conf for paths */
1910 static void scanelf_ldpath(void)
1911 {
1912 size_t n;
1913 const char *ldpath;
1914
1915 array_for_each(ldpaths, n, ldpath)
1916 scanelf_dir(ldpath);
1917 }
1918
1919 /* scan env PATH for paths */
1920 static void scanelf_envpath(void)
1921 {
1922 char *path, *p;
1923
1924 path = getenv("PATH");
1925 if (!path)
1926 err("PATH is not set in your env !");
1927 path = xstrdup(path);
1928
1929 while ((p = strrchr(path, ':')) != NULL) {
1930 scanelf_dir(p + 1);
1931 *p = 0;
1932 }
1933
1934 free(path);
1935 }
1936
1937 /* usage / invocation handling functions */ /* Free Flags: c d j u w G H J K P Q U W */
1938 #define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZCBhV"
1939 #define a_argument required_argument
1940 static struct option const long_opts[] = {
1941 {"path", no_argument, NULL, 'p'},
1942 {"ldpath", no_argument, NULL, 'l'},
1943 {"use-ldpath",no_argument, NULL, 129},
1944 {"root", a_argument, NULL, 128},
1945 {"recursive", no_argument, NULL, 'R'},
1946 {"mount", no_argument, NULL, 'm'},
1947 {"symlink", no_argument, NULL, 'y'},
1948 {"archives", no_argument, NULL, 'A'},
1949 {"ldcache", no_argument, NULL, 'L'},
1950 {"fix", no_argument, NULL, 'X'},
1951 {"setpax", a_argument, NULL, 'z'},
1952 {"pax", no_argument, NULL, 'x'},
1953 {"header", no_argument, NULL, 'e'},
1954 {"textrel", no_argument, NULL, 't'},
1955 {"rpath", no_argument, NULL, 'r'},
1956 {"needed", no_argument, NULL, 'n'},
1957 {"interp", no_argument, NULL, 'i'},
1958 {"bind", no_argument, NULL, 'b'},
1959 {"soname", no_argument, NULL, 'S'},
1960 {"symbol", a_argument, NULL, 's'},
1961 {"section", a_argument, NULL, 'k'},
1962 {"lib", a_argument, NULL, 'N'},
1963 {"gmatch", no_argument, NULL, 'g'},
1964 {"textrels", no_argument, NULL, 'T'},
1965 {"etype", a_argument, NULL, 'E'},
1966 {"bits", a_argument, NULL, 'M'},
1967 {"endian", no_argument, NULL, 'D'},
1968 {"osabi", no_argument, NULL, 'I'},
1969 {"eabi", no_argument, NULL, 'Y'},
1970 {"perms", a_argument, NULL, 'O'},
1971 {"size", no_argument, NULL, 'Z'},
1972 {"all", no_argument, NULL, 'a'},
1973 {"quiet", no_argument, NULL, 'q'},
1974 {"verbose", no_argument, NULL, 'v'},
1975 {"format", a_argument, NULL, 'F'},
1976 {"from", a_argument, NULL, 'f'},
1977 {"file", a_argument, NULL, 'o'},
1978 {"nocolor", no_argument, NULL, 'C'},
1979 {"nobanner", no_argument, NULL, 'B'},
1980 {"help", no_argument, NULL, 'h'},
1981 {"version", no_argument, NULL, 'V'},
1982 {NULL, no_argument, NULL, 0x0}
1983 };
1984
1985 static const char * const opts_help[] = {
1986 "Scan all directories in PATH environment",
1987 "Scan all directories in /etc/ld.so.conf",
1988 "Use ld.so.conf to show full path (use with -r/-n)",
1989 "Root directory (use with -l or -p)",
1990 "Scan directories recursively",
1991 "Don't recursively cross mount points",
1992 "Don't scan symlinks",
1993 "Scan archives (.a files)",
1994 "Utilize ld.so.cache to show full path (use with -r/-n)",
1995 "Try and 'fix' bad things (use with -r/-e)",
1996 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1997 "Print PaX markings",
1998 "Print GNU_STACK/PT_LOAD markings",
1999 "Print TEXTREL information",
2000 "Print RPATH information",
2001 "Print NEEDED information",
2002 "Print INTERP information",
2003 "Print BIND information",
2004 "Print SONAME information",
2005 "Find a specified symbol",
2006 "Find a specified section",
2007 "Find a specified library",
2008 "Use regex rather than string compare (with -s); specify twice for case insensitive",
2009 "Locate cause of TEXTREL",
2010 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
2011 "Print only ELF files matching numeric bits",
2012 "Print Endianness",
2013 "Print OSABI",
2014 "Print EABI (EM_ARM Only)",
2015 "Print only ELF files matching octal permissions",
2016 "Print ELF file size",
2017 "Print all useful/simple info\n",
2018 "Only output 'bad' things",
2019 "Be verbose (can be specified more than once)",
2020 "Use specified format for output",
2021 "Read input stream from a filename",
2022 "Write output stream to a filename",
2023 "Don't emit color in output",
2024 "Don't display the header",
2025 "Print this help and exit",
2026 "Print version and exit",
2027 NULL
2028 };
2029
2030 /* display usage and exit */
2031 static void usage(int status)
2032 {
2033 unsigned long i;
2034 printf("* Scan ELF binaries for stuff\n\n"
2035 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
2036 printf("Options: -[%s]\n", PARSE_FLAGS);
2037 for (i = 0; long_opts[i].name; ++i) {
2038 /* first output the short flag if it has one */
2039 if (long_opts[i].val > '~')
2040 printf(" ");
2041 else
2042 printf(" -%c, ", long_opts[i].val);
2043
2044 /* then the long flag */
2045 if (long_opts[i].has_arg == no_argument)
2046 printf("--%-14s", long_opts[i].name);
2047 else
2048 printf("--%-7s <arg> ", long_opts[i].name);
2049
2050 /* finally the help text */
2051 printf("* %s\n", opts_help[i]);
2052 }
2053
2054 puts("\nFor more information, see the scanelf(1) manpage");
2055 exit(status);
2056 }
2057
2058 /* parse command line arguments and preform needed actions */
2059 #define do_pax_state(option, flag) \
2060 if (islower(option)) { \
2061 flags &= ~PF_##flag; \
2062 flags |= PF_NO##flag; \
2063 } else { \
2064 flags &= ~PF_NO##flag; \
2065 flags |= PF_##flag; \
2066 }
2067 static int parseargs(int argc, char *argv[])
2068 {
2069 int i;
2070 const char *from_file = NULL;
2071 int ret = 0;
2072 char load_cache_config = 0;
2073
2074 opterr = 0;
2075 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
2076 switch (i) {
2077
2078 case 'V':
2079 printf("pax-utils-%s: %s compiled %s\n%s\n"
2080 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
2081 VERSION, __FILE__, __DATE__, rcsid, argv0);
2082 exit(EXIT_SUCCESS);
2083 break;
2084 case 'h': usage(EXIT_SUCCESS); break;
2085 case 'f':
2086 if (from_file) warn("You prob don't want to specify -f twice");
2087 from_file = optarg;
2088 break;
2089 case 'E':
2090 match_etypes = optarg;
2091 break;
2092 case 'M':
2093 match_bits = atoi(optarg);
2094 if (match_bits == 0) {
2095 if (strcmp(optarg, "ELFCLASS32") == 0)
2096 match_bits = 32;
2097 if (strcmp(optarg, "ELFCLASS64") == 0)
2098 match_bits = 64;
2099 }
2100 break;
2101 case 'O':
2102 if (sscanf(optarg, "%o", &match_perms) == -1)
2103 match_bits = 0;
2104 break;
2105 case 'o': {
2106 if (freopen(optarg, "w", stdout) == NULL)
2107 errp("Could not freopen(%s)", optarg);
2108 break;
2109 }
2110 case 'k':
2111 xarraypush_str(find_section_arr, optarg);
2112 break;
2113 case 's': {
2114 /* historically, this was comma delimited */
2115 char *this_sym = strtok(optarg, ",");
2116 if (!this_sym) /* edge case: -s '' */
2117 xarraypush_str(find_sym_arr, "");
2118 while (this_sym) {
2119 xarraypush_str(find_sym_arr, this_sym);
2120 this_sym = strtok(NULL, ",");
2121 }
2122 break;
2123 }
2124 case 'N':
2125 xarraypush_str(find_lib_arr, optarg);
2126 break;
2127 case 'F': {
2128 if (out_format) warn("You prob don't want to specify -F twice");
2129 out_format = optarg;
2130 break;
2131 }
2132 case 'z': {
2133 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
2134 size_t x;
2135
2136 for (x = 0; x < strlen(optarg); x++) {
2137 switch (optarg[x]) {
2138 case 'p':
2139 case 'P':
2140 do_pax_state(optarg[x], PAGEEXEC);
2141 break;
2142 case 's':
2143 case 'S':
2144 do_pax_state(optarg[x], SEGMEXEC);
2145 break;
2146 case 'm':
2147 case 'M':
2148 do_pax_state(optarg[x], MPROTECT);
2149 break;
2150 case 'e':
2151 case 'E':
2152 do_pax_state(optarg[x], EMUTRAMP);
2153 break;
2154 case 'r':
2155 case 'R':
2156 do_pax_state(optarg[x], RANDMMAP);
2157 break;
2158 case 'x':
2159 case 'X':
2160 do_pax_state(optarg[x], RANDEXEC);
2161 break;
2162 default:
2163 break;
2164 }
2165 }
2166 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
2167 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
2168 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
2169 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
2170 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
2171 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
2172 setpax = flags;
2173 break;
2174 }
2175 case 'Z': show_size = 1; break;
2176 case 'g': ++g_match; break;
2177 case 'L': load_cache_config = use_ldcache = 1; break;
2178 case 'y': scan_symlink = 0; break;
2179 case 'A': scan_archives = 1; break;
2180 case 'C': color_init(true); break;
2181 case 'B': show_banner = 0; break;
2182 case 'l': load_cache_config = scan_ldpath = 1; break;
2183 case 'p': scan_envpath = 1; break;
2184 case 'R': dir_recurse = 1; break;
2185 case 'm': dir_crossmount = 0; break;
2186 case 'X': ++fix_elf; break;
2187 case 'x': show_pax = 1; break;
2188 case 'e': show_phdr = 1; break;
2189 case 't': show_textrel = 1; break;
2190 case 'r': show_rpath = 1; break;
2191 case 'n': show_needed = 1; break;
2192 case 'i': show_interp = 1; break;
2193 case 'b': show_bind = 1; break;
2194 case 'S': show_soname = 1; break;
2195 case 'T': show_textrels = 1; break;
2196 case 'q': be_quiet = 1; break;
2197 case 'v': be_verbose = (be_verbose % 20) + 1; break;
2198 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
2199 case 'D': show_endian = 1; break;
2200 case 'I': show_osabi = 1; break;
2201 case 'Y': show_eabi = 1; break;
2202 case 128:
2203 root_fd = open(optarg, O_RDONLY|O_CLOEXEC);
2204 if (root_fd == -1)
2205 err("Could not open root: %s", optarg);
2206 break;
2207 case 129: load_cache_config = use_ldpath = 1; break;
2208 case ':':
2209 err("Option '%c' is missing parameter", optopt);
2210 case '?':
2211 err("Unknown option '%c' or argument missing", optopt);
2212 default:
2213 err("Unhandled option '%c'; please report this", i);
2214 }
2215 }
2216 if (show_textrels && be_verbose)
2217 has_objdump = bin_in_path("objdump");
2218 /* precompile all the regexes */
2219 if (g_match) {
2220 regex_t preg;
2221 const char *this_sym;
2222 size_t n;
2223 int flags = REG_EXTENDED | REG_NOSUB | (g_match > 1 ? REG_ICASE : 0);
2224
2225 array_for_each(find_sym_arr, n, this_sym) {
2226 /* see scanelf_match_symname for logic info */
2227 switch (this_sym[0]) {
2228 case '%':
2229 while (*(this_sym++))
2230 if (*this_sym == '%') {
2231 ++this_sym;
2232 break;
2233 }
2234 break;
2235 case '+':
2236 case '-':
2237 ++this_sym;
2238 break;
2239 }
2240 if (*this_sym == '*')
2241 ++this_sym;
2242
2243 ret = regcomp(&preg, this_sym, flags);
2244 if (ret) {
2245 char err[256];
2246 regerror(ret, &preg, err, sizeof(err));
2247 err("regcomp of %s failed: %s", this_sym, err);
2248 }
2249 xarraypush(find_sym_regex_arr, &preg, sizeof(preg));
2250 }
2251 }
2252 /* flatten arrays for display */
2253 if (array_cnt(find_sym_arr))
2254 find_sym = array_flatten_str(find_sym_arr);
2255 if (array_cnt(find_lib_arr))
2256 find_lib = array_flatten_str(find_lib_arr);
2257 if (array_cnt(find_section_arr))
2258 find_section = array_flatten_str(find_section_arr);
2259 /* let the format option override all other options */
2260 if (out_format) {
2261 show_pax = show_phdr = show_textrel = show_rpath = \
2262 show_needed = show_interp = show_bind = show_soname = \
2263 show_textrels = show_perms = show_endian = show_size = \
2264 show_osabi = show_eabi = 0;
2265 for (i = 0; out_format[i]; ++i) {
2266 if (!IS_MODIFIER(out_format[i])) continue;
2267
2268 switch (out_format[++i]) {
2269 case '+': break;
2270 case '%': break;
2271 case '#': break;
2272 case 'F': break;
2273 case 'p': break;
2274 case 'f': break;
2275 case 'k': break;
2276 case 's': break;
2277 case 'N': break;
2278 case 'o': break;
2279 case 'a': break;
2280 case 'M': break;
2281 case 'Z': show_size = 1; break;
2282 case 'D': show_endian = 1; break;
2283 case 'I': show_osabi = 1; break;
2284 case 'Y': show_eabi = 1; break;
2285 case 'O': show_perms = 1; break;
2286 case 'x': show_pax = 1; break;
2287 case 'e': show_phdr = 1; break;
2288 case 't': show_textrel = 1; break;
2289 case 'r': show_rpath = 1; break;
2290 case 'n': show_needed = 1; break;
2291 case 'i': show_interp = 1; break;
2292 case 'b': show_bind = 1; break;
2293 case 'S': show_soname = 1; break;
2294 case 'T': show_textrels = 1; break;
2295 default:
2296 err("invalid format specifier '%c' (byte %i)",
2297 out_format[i], i+1);
2298 }
2299 }
2300
2301 /* construct our default format */
2302 } else {
2303 size_t fmt_len = 30;
2304 out_format = xmalloc(sizeof(char) * fmt_len);
2305 *out_format = '\0';
2306 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
2307 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
2308 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
2309 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
2310 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
2311 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
2312 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
2313 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
2314 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
2315 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
2316 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
2317 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
2318 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
2319 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
2320 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
2321 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
2322 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
2323 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
2324 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
2325 }
2326 if (be_verbose > 2) printf("Format: %s\n", out_format);
2327
2328 /* now lets actually do the scanning */
2329 if (load_cache_config)
2330 load_ld_cache_config(__PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
2331 if (scan_ldpath) scanelf_ldpath();
2332 if (scan_envpath) scanelf_envpath();
2333 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
2334 from_file = "-";
2335 if (from_file) {
2336 scanelf_from_file(from_file);
2337 from_file = *argv;
2338 }
2339 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
2340 err("Nothing to scan !?");
2341 while (optind < argc) {
2342 search_path = argv[optind++];
2343 ret = scanelf_dir(search_path);
2344 }
2345
2346 #ifdef __PAX_UTILS_CLEANUP
2347 /* clean up */
2348 xarrayfree(ldpaths);
2349 xarrayfree(find_sym_arr);
2350 xarrayfree(find_lib_arr);
2351 xarrayfree(find_section_arr);
2352 free(find_sym);
2353 free(find_lib);
2354 free(find_section);
2355 {
2356 size_t n;
2357 regex_t *preg;
2358 array_for_each(find_sym_regex_arr, n, preg)
2359 regfree(preg);
2360 xarrayfree(find_sym_regex_arr);
2361 }
2362
2363 if (ldcache != 0)
2364 munmap(ldcache, ldcache_size);
2365 #endif
2366
2367 return ret;
2368 }
2369
2370 static char **get_split_env(const char *envvar)
2371 {
2372 const char *delims = " \t\n";
2373 char **envvals = NULL;
2374 char *env, *s;
2375 int nentry;
2376
2377 if ((env = getenv(envvar)) == NULL)
2378 return NULL;
2379
2380 env = xstrdup(env);
2381 if (env == NULL)
2382 return NULL;
2383
2384 s = strtok(env, delims);
2385 if (s == NULL) {
2386 free(env);
2387 return NULL;
2388 }
2389
2390 nentry = 0;
2391 while (s != NULL) {
2392 ++nentry;
2393 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
2394 envvals[nentry-1] = s;
2395 s = strtok(NULL, delims);
2396 }
2397 envvals[nentry] = NULL;
2398
2399 /* don't want to free(env) as it contains the memory that backs
2400 * the envvals array of strings */
2401 return envvals;
2402 }
2403
2404 static void parseenv(void)
2405 {
2406 color_init(false);
2407 qa_textrels = get_split_env("QA_TEXTRELS");
2408 qa_execstack = get_split_env("QA_EXECSTACK");
2409 qa_wx_load = get_split_env("QA_WX_LOAD");
2410 }
2411
2412 #ifdef __PAX_UTILS_CLEANUP
2413 static void cleanup(void)
2414 {
2415 free(out_format);
2416 free(qa_textrels);
2417 free(qa_execstack);
2418 free(qa_wx_load);
2419 }
2420 #endif
2421
2422 int main(int argc, char *argv[])
2423 {
2424 int ret;
2425 if (argc < 2)
2426 usage(EXIT_FAILURE);
2427 parseenv();
2428 ret = parseargs(argc, argv);
2429 fclose(stdout);
2430 #ifdef __PAX_UTILS_CLEANUP
2431 cleanup();
2432 warn("The calls to add/delete heap should be off:\n"
2433 "\t- 1 due to the out_buffer not being freed in scanelf_fileat()\n"
2434 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
2435 #endif
2436 return ret;
2437 }
2438
2439 /* Match filename against entries in matchlist, return TRUE
2440 * if the file is listed */
2441 static int file_matches_list(const char *filename, char **matchlist)
2442 {
2443 char **file;
2444 char *match;
2445 char buf[__PAX_UTILS_PATH_MAX];
2446
2447 if (matchlist == NULL)
2448 return 0;
2449
2450 for (file = matchlist; *file != NULL; file++) {
2451 if (search_path) {
2452 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2453 match = buf;
2454 } else {
2455 match = *file;
2456 }
2457 if (fnmatch(match, filename, 0) == 0)
2458 return 1;
2459 }
2460 return 0;
2461 }

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