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Revision 1.248 - (show annotations) (download) (as text)
Sun Nov 4 07:48:42 2012 UTC (17 months, 2 weeks ago) by vapier
Branch: MAIN
Changes since 1.247: +17 -23 lines
File MIME type: text/x-csrc
scanelf: convert -s parsing to arrays and allow multiple -s options

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 1.247 2012/11/04 07:26:24 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 1.247 2012/11/04 07:26:24 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 char *find_lib = NULL;
51 static array_t _find_lib_arr = array_init_decl, *find_lib_arr = &_find_lib_arr;
52 static char *find_section = NULL;
53 static array_t _find_section_arr = array_init_decl, *find_section_arr = &_find_section_arr;
54 static char *out_format = NULL;
55 static char *search_path = NULL;
56 static char fix_elf = 0;
57 static char g_match = 0;
58 static char use_ldcache = 0;
59 static char use_ldpath = 0;
60
61 static char **qa_textrels = NULL;
62 static char **qa_execstack = NULL;
63 static char **qa_wx_load = NULL;
64 static int root_fd = AT_FDCWD;
65
66 static int match_bits = 0;
67 static unsigned int match_perms = 0;
68 static void *ldcache = NULL;
69 static size_t ldcache_size = 0;
70 static unsigned long setpax = 0UL;
71
72 static int has_objdump = 0;
73
74 /* find the path to a file by name */
75 static int bin_in_path(const char *fname)
76 {
77 char fullpath[__PAX_UTILS_PATH_MAX];
78 char *path, *p;
79
80 path = getenv("PATH");
81 if (!path)
82 return 0;
83
84 while ((p = strrchr(path, ':')) != NULL) {
85 snprintf(fullpath, sizeof(fullpath), "%s/%s", p + 1, fname);
86 *p = 0;
87 if (access(fullpath, R_OK) != -1)
88 return 1;
89 }
90
91 return 0;
92 }
93
94 static FILE *fopenat_r(int dir_fd, const char *path)
95 {
96 int fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
97 if (fd == -1)
98 return NULL;
99 return fdopen(fd, "re");
100 }
101
102 static const char *root_rel_path(const char *path)
103 {
104 /*
105 * openat() will ignore the dirfd if path starts with
106 * a /, so consume all of that noise
107 *
108 * XXX: we don't handle relative paths like ../ that
109 * break out of the --root option, but for now, just
110 * don't do that :P.
111 */
112 if (root_fd != AT_FDCWD) {
113 while (*path == '/')
114 ++path;
115 if (*path == '\0')
116 path = ".";
117 }
118
119 return path;
120 }
121
122 /* 1 on failure. 0 otherwise */
123 static int rematch(const char *regex, const char *match, int cflags)
124 {
125 regex_t preg;
126 int ret;
127
128 if ((match == NULL) || (regex == NULL))
129 return EXIT_FAILURE;
130
131 ret = regcomp(&preg, regex, cflags);
132 if (ret) {
133 char err[256];
134 regerror(ret, &preg, err, sizeof(err));
135 warnf("regcomp failed: %s", err);
136 return EXIT_FAILURE;
137 }
138 ret = regexec(&preg, match, 0, NULL, 0);
139 regfree(&preg);
140
141 return ret;
142 }
143
144 /* sub-funcs for scanelf_fileat() */
145 static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **str)
146 {
147 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
148
149 /* debug sections */
150 void *symtab = elf_findsecbyname(elf, ".symtab");
151 void *strtab = elf_findsecbyname(elf, ".strtab");
152 /* runtime sections */
153 void *dynsym = elf_findsecbyname(elf, ".dynsym");
154 void *dynstr = elf_findsecbyname(elf, ".dynstr");
155
156 /*
157 * If the sections are marked NOBITS, then they don't exist, so we just
158 * skip them. This let's us work sanely with splitdebug ELFs (rather
159 * than spewing a lot of "corrupt ELF" messages later on). In malformed
160 * ELFs, the section might be wrongly set to NOBITS, but screw em.
161 */
162 #define GET_SYMTABS(B) \
163 if (elf->elf_class == ELFCLASS ## B) { \
164 Elf ## B ## _Shdr *esymtab = symtab; \
165 Elf ## B ## _Shdr *estrtab = strtab; \
166 Elf ## B ## _Shdr *edynsym = dynsym; \
167 Elf ## B ## _Shdr *edynstr = dynstr; \
168 \
169 if (symtab && EGET(esymtab->sh_type) == SHT_NOBITS) \
170 symtab = NULL; \
171 if (dynsym && EGET(edynsym->sh_type) == SHT_NOBITS) \
172 dynsym = NULL; \
173 if (symtab && dynsym) \
174 *sym = (EGET(esymtab->sh_size) > EGET(edynsym->sh_size)) ? symtab : dynsym; \
175 else \
176 *sym = symtab ? symtab : dynsym; \
177 \
178 if (strtab && EGET(estrtab->sh_type) == SHT_NOBITS) \
179 strtab = NULL; \
180 if (dynstr && EGET(edynstr->sh_type) == SHT_NOBITS) \
181 dynstr = NULL; \
182 if (strtab && dynstr) \
183 *str = (EGET(estrtab->sh_size) > EGET(edynstr->sh_size)) ? strtab : dynstr; \
184 else \
185 *str = strtab ? strtab : dynstr; \
186 }
187 GET_SYMTABS(32)
188 GET_SYMTABS(64)
189
190 if (*sym && *str)
191 return;
192
193 /*
194 * damn, they're really going to make us work for it huh?
195 * reconstruct the section header info out of the dynamic
196 * tags so we can see what symbols this guy uses at runtime.
197 */
198 #define GET_SYMTABS_DT(B) \
199 if (elf->elf_class == ELFCLASS ## B) { \
200 size_t i; \
201 static Elf ## B ## _Shdr sym_shdr, str_shdr; \
202 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
203 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
204 Elf ## B ## _Addr vsym, vstr, vhash, vgnu_hash; \
205 Elf ## B ## _Dyn *dyn; \
206 Elf ## B ## _Off offset; \
207 \
208 /* lookup symbols used at runtime with DT_SYMTAB / DT_STRTAB */ \
209 vsym = vstr = vhash = vgnu_hash = 0; \
210 memset(&sym_shdr, 0, sizeof(sym_shdr)); \
211 memset(&str_shdr, 0, sizeof(str_shdr)); \
212 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
213 if (EGET(phdr[i].p_type) != PT_DYNAMIC) \
214 continue; \
215 \
216 offset = EGET(phdr[i].p_offset); \
217 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
218 continue; \
219 \
220 dyn = DYN ## B (elf->vdata + offset); \
221 while (EGET(dyn->d_tag) != DT_NULL) { \
222 switch (EGET(dyn->d_tag)) { \
223 case DT_SYMTAB: vsym = EGET(dyn->d_un.d_val); break; \
224 case DT_SYMENT: sym_shdr.sh_entsize = dyn->d_un.d_val; break; \
225 case DT_STRTAB: vstr = EGET(dyn->d_un.d_val); break; \
226 case DT_STRSZ: str_shdr.sh_size = dyn->d_un.d_val; break; \
227 case DT_HASH: vhash = EGET(dyn->d_un.d_val); break; \
228 /*case DT_GNU_HASH: vgnu_hash = EGET(dyn->d_un.d_val); break;*/ \
229 } \
230 ++dyn; \
231 } \
232 if (vsym && vstr) \
233 break; \
234 } \
235 if (!vsym || !vstr || !(vhash || vgnu_hash)) \
236 return; \
237 \
238 /* calc offset into the ELF by finding the load addr of the syms */ \
239 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
240 Elf ## B ## _Addr vaddr = EGET(phdr[i].p_vaddr); \
241 Elf ## B ## _Addr filesz = EGET(phdr[i].p_filesz); \
242 offset = EGET(phdr[i].p_offset); \
243 \
244 if (EGET(phdr[i].p_type) != PT_LOAD) \
245 continue; \
246 \
247 if (vhash >= vaddr && vhash < vaddr + filesz) { \
248 /* Scan the hash table to see how many entries we have */ \
249 Elf32_Word max_sym_idx = 0; \
250 Elf32_Word *hashtbl = elf->vdata + offset + (vhash - vaddr); \
251 Elf32_Word b, nbuckets = EGET(hashtbl[0]); \
252 Elf32_Word nchains = EGET(hashtbl[1]); \
253 Elf32_Word *buckets = &hashtbl[2]; \
254 Elf32_Word *chains = &buckets[nbuckets]; \
255 Elf32_Word sym_idx; \
256 \
257 for (b = 0; b < nbuckets; ++b) { \
258 if (!buckets[b]) \
259 continue; \
260 for (sym_idx = buckets[b]; sym_idx < nchains && sym_idx; sym_idx = chains[sym_idx]) \
261 if (max_sym_idx < sym_idx) \
262 max_sym_idx = sym_idx; \
263 } \
264 ESET(sym_shdr.sh_size, sym_shdr.sh_entsize * max_sym_idx); \
265 } \
266 \
267 if (vsym >= vaddr && vsym < vaddr + filesz) { \
268 ESET(sym_shdr.sh_offset, offset + (vsym - vaddr)); \
269 *sym = &sym_shdr; \
270 } \
271 \
272 if (vstr >= vaddr && vstr < vaddr + filesz) { \
273 ESET(str_shdr.sh_offset, offset + (vstr - vaddr)); \
274 *str = &str_shdr; \
275 } \
276 } \
277 }
278 GET_SYMTABS_DT(32)
279 GET_SYMTABS_DT(64)
280 }
281
282 static char *scanelf_file_pax(elfobj *elf, char *found_pax)
283 {
284 static char ret[7];
285 unsigned long i, shown;
286
287 if (!show_pax) return NULL;
288
289 shown = 0;
290 memset(&ret, 0, sizeof(ret));
291
292 if (elf->phdr) {
293 #define SHOW_PAX(B) \
294 if (elf->elf_class == ELFCLASS ## B) { \
295 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
296 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
297 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
298 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
299 continue; \
300 if (fix_elf && setpax) { \
301 /* set the paxctl flags */ \
302 ESET(phdr[i].p_flags, setpax); \
303 } \
304 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
305 continue; \
306 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
307 *found_pax = 1; \
308 ++shown; \
309 break; \
310 } \
311 }
312 SHOW_PAX(32)
313 SHOW_PAX(64)
314 }
315
316 /* Note: We do not support setting EI_PAX if not PT_PAX_FLAGS
317 * was found. This is known to break ELFs on glibc systems,
318 * and mainline PaX has deprecated use of this for a long time.
319 * We could support changing PT_GNU_STACK, but that doesn't
320 * seem like it's worth the effort. #411919
321 */
322
323 /* fall back to EI_PAX if no PT_PAX was found */
324 if (!*ret) {
325 static char *paxflags;
326 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
327 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
328 *found_pax = 1;
329 return (be_wewy_wewy_quiet ? NULL : paxflags);
330 }
331 strncpy(ret, paxflags, sizeof(ret));
332 }
333
334 if (be_wewy_wewy_quiet || (be_quiet && !shown))
335 return NULL;
336 else
337 return ret;
338 }
339
340 static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
341 {
342 static char ret[12];
343 char *found;
344 unsigned long i, shown, multi_stack, multi_relro, multi_load;
345 int max_pt_load;
346
347 if (!show_phdr) return NULL;
348
349 memcpy(ret, "--- --- ---\0", 12);
350
351 shown = 0;
352 multi_stack = multi_relro = multi_load = 0;
353 max_pt_load = elf_max_pt_load(elf);
354
355 #define NOTE_GNU_STACK ".note.GNU-stack"
356 #define SHOW_PHDR(B) \
357 if (elf->elf_class == ELFCLASS ## B) { \
358 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
359 Elf ## B ## _Off offset; \
360 uint32_t flags, check_flags; \
361 if (elf->phdr != NULL) { \
362 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
363 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
364 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
365 if (multi_stack++) \
366 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
367 if (file_matches_list(elf->filename, qa_execstack)) \
368 continue; \
369 found = found_phdr; \
370 offset = 0; \
371 check_flags = PF_X; \
372 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
373 if (multi_relro++) \
374 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
375 found = found_relro; \
376 offset = 4; \
377 check_flags = PF_X; \
378 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
379 if (EGET(ehdr->e_type) == ET_DYN || EGET(ehdr->e_type) == ET_EXEC) \
380 if (multi_load++ > max_pt_load) \
381 warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
382 if (file_matches_list(elf->filename, qa_wx_load)) \
383 continue; \
384 found = found_load; \
385 offset = 8; \
386 check_flags = PF_W|PF_X; \
387 } else \
388 continue; \
389 flags = EGET(phdr[i].p_flags); \
390 if (be_quiet && ((flags & check_flags) != check_flags)) \
391 continue; \
392 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
393 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
394 ret[3] = ret[7] = '!'; \
395 flags = EGET(phdr[i].p_flags); \
396 } \
397 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
398 *found = 1; \
399 ++shown; \
400 } \
401 } else if (elf->shdr != NULL) { \
402 /* no program headers which means this is prob an object file */ \
403 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
404 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
405 char *str; \
406 if ((void*)strtbl > elf->data_end) \
407 goto skip_this_shdr##B; \
408 check_flags = SHF_WRITE|SHF_EXECINSTR; \
409 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
410 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
411 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
412 str = elf->data + offset; \
413 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
414 if (!strcmp(str, NOTE_GNU_STACK)) { \
415 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
416 flags = EGET(shdr[i].sh_flags); \
417 if (be_quiet && ((flags & check_flags) != check_flags)) \
418 continue; \
419 ++*found_phdr; \
420 shown = 1; \
421 if (flags & SHF_WRITE) ret[0] = 'W'; \
422 if (flags & SHF_ALLOC) ret[1] = 'A'; \
423 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
424 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
425 break; \
426 } \
427 } \
428 skip_this_shdr##B: \
429 if (!multi_stack) { \
430 if (file_matches_list(elf->filename, qa_execstack)) \
431 return NULL; \
432 *found_phdr = 1; \
433 shown = 1; \
434 memcpy(ret, "!WX", 3); \
435 } \
436 } \
437 }
438 SHOW_PHDR(32)
439 SHOW_PHDR(64)
440
441 if (be_wewy_wewy_quiet || (be_quiet && !shown))
442 return NULL;
443 else
444 return ret;
445 }
446
447 /*
448 * See if this ELF contains a DT_TEXTREL tag in any of its
449 * PT_DYNAMIC sections.
450 */
451 static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
452 {
453 static const char *ret = "TEXTREL";
454 unsigned long i;
455
456 if (!show_textrel && !show_textrels) return NULL;
457
458 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
459
460 if (elf->phdr) {
461 #define SHOW_TEXTREL(B) \
462 if (elf->elf_class == ELFCLASS ## B) { \
463 Elf ## B ## _Dyn *dyn; \
464 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
465 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
466 Elf ## B ## _Off offset; \
467 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
468 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
469 offset = EGET(phdr[i].p_offset); \
470 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
471 dyn = DYN ## B (elf->vdata + offset); \
472 while (EGET(dyn->d_tag) != DT_NULL) { \
473 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
474 *found_textrel = 1; \
475 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
476 return (be_wewy_wewy_quiet ? NULL : ret); \
477 } \
478 ++dyn; \
479 } \
480 } }
481 SHOW_TEXTREL(32)
482 SHOW_TEXTREL(64)
483 }
484
485 if (be_quiet || be_wewy_wewy_quiet)
486 return NULL;
487 else
488 return " - ";
489 }
490
491 /*
492 * Scan the .text section to see if there are any relocations in it.
493 * Should rewrite this to check PT_LOAD sections that are marked
494 * Executable rather than the section named '.text'.
495 */
496 static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
497 {
498 unsigned long s, r, rmax;
499 void *symtab_void, *strtab_void, *text_void;
500
501 if (!show_textrels) return NULL;
502
503 /* don't search for TEXTREL's if the ELF doesn't have any */
504 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
505 if (!*found_textrel) return NULL;
506
507 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
508 text_void = elf_findsecbyname(elf, ".text");
509
510 if (symtab_void && strtab_void && text_void && elf->shdr) {
511 #define SHOW_TEXTRELS(B) \
512 if (elf->elf_class == ELFCLASS ## B) { \
513 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
514 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
515 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
516 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
517 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
518 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
519 uint ## B ## _t memsz = EGET(text->sh_size); \
520 Elf ## B ## _Rel *rel; \
521 Elf ## B ## _Rela *rela; \
522 /* search the section headers for relocations */ \
523 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
524 uint32_t sh_type = EGET(shdr[s].sh_type); \
525 if (sh_type == SHT_REL) { \
526 rel = REL ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
527 rela = NULL; \
528 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
529 } else if (sh_type == SHT_RELA) { \
530 rel = NULL; \
531 rela = RELA ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
532 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
533 } else \
534 continue; \
535 /* now see if any of the relocs are in the .text */ \
536 for (r = 0; r < rmax; ++r) { \
537 unsigned long sym_max; \
538 Elf ## B ## _Addr offset_tmp; \
539 Elf ## B ## _Sym *func; \
540 Elf ## B ## _Sym *sym; \
541 Elf ## B ## _Addr r_offset; \
542 uint ## B ## _t r_info; \
543 if (sh_type == SHT_REL) { \
544 r_offset = EGET(rel[r].r_offset); \
545 r_info = EGET(rel[r].r_info); \
546 } else { \
547 r_offset = EGET(rela[r].r_offset); \
548 r_info = EGET(rela[r].r_info); \
549 } \
550 /* make sure this relocation is inside of the .text */ \
551 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
552 if (be_verbose <= 2) continue; \
553 } else \
554 *found_textrels = 1; \
555 /* locate this relocation symbol name */ \
556 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
557 if ((void*)sym > elf->data_end) { \
558 warn("%s: corrupt ELF symbol", elf->filename); \
559 continue; \
560 } \
561 sym_max = ELF ## B ## _R_SYM(r_info); \
562 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
563 sym += sym_max; \
564 else \
565 sym = NULL; \
566 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
567 /* show the raw details about this reloc */ \
568 printf(" %s: ", elf->base_filename); \
569 if (sym && sym->st_name) \
570 printf("%s", elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
571 else \
572 printf("(memory/data?)"); \
573 printf(" [0x%lX]", (unsigned long)r_offset); \
574 /* now try to find the closest symbol that this rel is probably in */ \
575 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
576 func = NULL; \
577 offset_tmp = 0; \
578 while (sym_max--) { \
579 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
580 func = sym; \
581 offset_tmp = EGET(sym->st_value); \
582 } \
583 ++sym; \
584 } \
585 printf(" in "); \
586 if (func && func->st_name) { \
587 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
588 if (r_offset > EGET(func->st_size)) \
589 printf("(optimized out: previous %s)", func_name); \
590 else \
591 printf("%s", func_name); \
592 } else \
593 printf("(optimized out)"); \
594 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
595 if (be_verbose && has_objdump) { \
596 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
597 char *sysbuf; \
598 size_t syslen; \
599 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"; \
600 syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
601 sysbuf = xmalloc(syslen); \
602 if (end_addr < r_offset) \
603 /* not uncommon when things are optimized out */ \
604 end_addr = r_offset + 0x100; \
605 snprintf(sysbuf, syslen, sysfmt, \
606 (unsigned long)offset_tmp, \
607 (unsigned long)end_addr, \
608 elf->filename, \
609 (unsigned long)r_offset); \
610 fflush(stdout); \
611 if (system(sysbuf)) /* don't care */; \
612 fflush(stdout); \
613 free(sysbuf); \
614 } \
615 } \
616 } }
617 SHOW_TEXTRELS(32)
618 SHOW_TEXTRELS(64)
619 }
620 if (!*found_textrels)
621 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
622
623 return NULL;
624 }
625
626 static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
627 {
628 struct stat st;
629 switch (*item) {
630 case '/': break;
631 case '.':
632 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
633 break;
634 case ':':
635 case '\0':
636 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
637 break;
638 case '$':
639 if (fstat(elf->fd, &st) != -1)
640 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
641 warnf("Security problem with %s='%s' in %s with mode set of %o",
642 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
643 break;
644 default:
645 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
646 break;
647 }
648 }
649 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
650 {
651 unsigned long i;
652 char *rpath, *runpath, **r;
653 void *strtbl_void;
654
655 if (!show_rpath) return;
656
657 strtbl_void = elf_findsecbyname(elf, ".dynstr");
658 rpath = runpath = NULL;
659
660 if (elf->phdr && strtbl_void) {
661 #define SHOW_RPATH(B) \
662 if (elf->elf_class == ELFCLASS ## B) { \
663 Elf ## B ## _Dyn *dyn; \
664 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
665 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
666 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
667 Elf ## B ## _Off offset; \
668 Elf ## B ## _Xword word; \
669 /* Scan all the program headers */ \
670 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
671 /* Just scan dynamic headers */ \
672 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
673 offset = EGET(phdr[i].p_offset); \
674 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
675 /* Just scan dynamic RPATH/RUNPATH headers */ \
676 dyn = DYN ## B (elf->vdata + offset); \
677 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
678 if (word == DT_RPATH) { \
679 r = &rpath; \
680 } else if (word == DT_RUNPATH) { \
681 r = &runpath; \
682 } else { \
683 ++dyn; \
684 continue; \
685 } \
686 /* Verify the memory is somewhat sane */ \
687 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
688 if (offset < (Elf ## B ## _Off)elf->len) { \
689 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
690 *r = elf->data + offset; \
691 /* cache the length in case we need to nuke this section later on */ \
692 if (fix_elf) \
693 offset = strlen(*r); \
694 /* If quiet, don't output paths in ld.so.conf */ \
695 if (be_quiet) { \
696 size_t len; \
697 char *start, *end; \
698 /* note that we only 'chop' off leading known paths. */ \
699 /* since *r is read-only memory, we can only move the ptr forward. */ \
700 start = *r; \
701 /* scan each path in : delimited list */ \
702 while (start) { \
703 rpath_security_checks(elf, start, get_elfdtype(word)); \
704 end = strchr(start, ':'); \
705 len = (end ? abs(end - start) : strlen(start)); \
706 if (use_ldcache) { \
707 size_t n; \
708 const char *ldpath; \
709 array_for_each(ldpaths, n, ldpath) \
710 if (!strncmp(ldpath, start, len) && !ldpath[len]) { \
711 *r = end; \
712 /* corner case ... if RPATH reads "/usr/lib:", we want \
713 * to show ':' rather than '' */ \
714 if (end && end[1] != '\0') \
715 (*r)++; \
716 break; \
717 } \
718 } \
719 if (!*r || !end) \
720 break; \
721 else \
722 start = start + len + 1; \
723 } \
724 } \
725 if (*r) { \
726 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
727 /* just nuke it */ \
728 nuke_it##B: \
729 memset(*r, 0x00, offset); \
730 *r = NULL; \
731 ESET(dyn->d_tag, DT_DEBUG); \
732 ESET(dyn->d_un.d_ptr, 0); \
733 } else if (fix_elf) { \
734 /* try to clean "bad" paths */ \
735 size_t len, tmpdir_len; \
736 char *start, *end; \
737 const char *tmpdir; \
738 start = *r; \
739 tmpdir = (getenv("TMPDIR") ? : "."); \
740 tmpdir_len = strlen(tmpdir); \
741 while (1) { \
742 end = strchr(start, ':'); \
743 if (start == end) { \
744 eat_this_path##B: \
745 len = strlen(end); \
746 memmove(start, end+1, len); \
747 start[len-1] = '\0'; \
748 end = start - 1; \
749 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
750 if (!end) { \
751 if (start == *r) \
752 goto nuke_it##B; \
753 *--start = '\0'; \
754 } else \
755 goto eat_this_path##B; \
756 } \
757 if (!end) \
758 break; \
759 start = end + 1; \
760 } \
761 if (**r == '\0') \
762 goto nuke_it##B; \
763 } \
764 if (*r) \
765 *found_rpath = 1; \
766 } \
767 } \
768 ++dyn; \
769 } \
770 } }
771 SHOW_RPATH(32)
772 SHOW_RPATH(64)
773 }
774
775 if (be_wewy_wewy_quiet) return;
776
777 if (rpath && runpath) {
778 if (!strcmp(rpath, runpath)) {
779 xstrcat(ret, runpath, ret_len);
780 } else {
781 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
782 xchrcat(ret, '{', ret_len);
783 xstrcat(ret, rpath, ret_len);
784 xchrcat(ret, ',', ret_len);
785 xstrcat(ret, runpath, ret_len);
786 xchrcat(ret, '}', ret_len);
787 }
788 } else if (rpath || runpath)
789 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
790 else if (!be_quiet)
791 xstrcat(ret, " - ", ret_len);
792 }
793
794 #define LDSO_CACHE_MAGIC "ld.so-"
795 #define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
796 #define LDSO_CACHE_VER "1.7.0"
797 #define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
798 #define FLAG_ANY -1
799 #define FLAG_TYPE_MASK 0x00ff
800 #define FLAG_LIBC4 0x0000
801 #define FLAG_ELF 0x0001
802 #define FLAG_ELF_LIBC5 0x0002
803 #define FLAG_ELF_LIBC6 0x0003
804 #define FLAG_REQUIRED_MASK 0xff00
805 #define FLAG_SPARC_LIB64 0x0100
806 #define FLAG_IA64_LIB64 0x0200
807 #define FLAG_X8664_LIB64 0x0300
808 #define FLAG_S390_LIB64 0x0400
809 #define FLAG_POWERPC_LIB64 0x0500
810 #define FLAG_MIPS64_LIBN32 0x0600
811 #define FLAG_MIPS64_LIBN64 0x0700
812
813 #if defined(__GLIBC__) || defined(__UCLIBC__)
814
815 static char *lookup_cache_lib(elfobj *elf, const char *fname)
816 {
817 int fd;
818 char *strs;
819 static char buf[__PAX_UTILS_PATH_MAX] = "";
820 const char *cachefile = root_rel_path("/etc/ld.so.cache");
821 struct stat st;
822
823 typedef struct {
824 char magic[LDSO_CACHE_MAGIC_LEN];
825 char version[LDSO_CACHE_VER_LEN];
826 int nlibs;
827 } header_t;
828 header_t *header;
829
830 typedef struct {
831 int flags;
832 int sooffset;
833 int liboffset;
834 } libentry_t;
835 libentry_t *libent;
836
837 if (fname == NULL)
838 return NULL;
839
840 if (ldcache == NULL) {
841 if (fstatat(root_fd, cachefile, &st, 0))
842 return NULL;
843
844 fd = openat(root_fd, cachefile, O_RDONLY);
845 if (fd == -1)
846 return NULL;
847
848 /* cache these values so we only map/unmap the cache file once */
849 ldcache_size = st.st_size;
850 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
851 close(fd);
852
853 if (ldcache == MAP_FAILED) {
854 ldcache = NULL;
855 return NULL;
856 }
857
858 if (memcmp(header->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN) ||
859 memcmp(header->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
860 {
861 munmap(ldcache, ldcache_size);
862 ldcache = NULL;
863 return NULL;
864 }
865 } else
866 header = ldcache;
867
868 libent = ldcache + sizeof(header_t);
869 strs = (char *) &libent[header->nlibs];
870
871 for (fd = 0; fd < header->nlibs; ++fd) {
872 /* This should be more fine grained, but for now we assume that
873 * diff arches will not be cached together, and we ignore the
874 * the different multilib mips cases.
875 */
876 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
877 continue;
878 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
879 continue;
880
881 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
882 continue;
883
884 /* Return first hit because that is how the ldso rolls */
885 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
886 break;
887 }
888
889 return buf;
890 }
891
892 #elif defined(__NetBSD__)
893 static char *lookup_cache_lib(elfobj *elf, const char *fname)
894 {
895 static char buf[__PAX_UTILS_PATH_MAX] = "";
896 static struct stat st;
897 size_t n;
898 char *ldpath;
899
900 array_for_each(ldpath, n, ldpath) {
901 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", ldpath, fname) >= sizeof(buf))
902 continue; /* if the pathname is too long, or something went wrong, ignore */
903
904 if (stat(buf, &st) != 0)
905 continue; /* if the lib doesn't exist in *ldpath, look further */
906
907 /* NetBSD doesn't actually do sanity checks, it just loads the file
908 * and if that doesn't work, continues looking in other directories.
909 * This cannot easily be safely emulated, unfortunately. For now,
910 * just assume that if it exists, it's a valid library. */
911
912 return buf;
913 }
914
915 /* not found in any path */
916 return NULL;
917 }
918 #else
919 #ifdef __ELF__
920 #warning Cache support not implemented for your target
921 #endif
922 static char *lookup_cache_lib(elfobj *elf, const char *fname)
923 {
924 return NULL;
925 }
926 #endif
927
928 static char *lookup_config_lib(elfobj *elf, char *fname)
929 {
930 static char buf[__PAX_UTILS_PATH_MAX] = "";
931 const char *ldpath;
932 size_t n;
933
934 array_for_each(ldpaths, n, ldpath) {
935 snprintf(buf, sizeof(buf), "%s/%s", root_rel_path(ldpath), fname);
936 if (faccessat(root_fd, buf, F_OK, AT_SYMLINK_NOFOLLOW) == 0)
937 return buf;
938 }
939
940 return NULL;
941 }
942
943 static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
944 {
945 unsigned long i;
946 char *needed;
947 void *strtbl_void;
948 char *p;
949
950 /*
951 * -n -> op==0 -> print all
952 * -N -> op==1 -> print requested
953 */
954 if ((op == 0 && !show_needed) || (op == 1 && !find_lib))
955 return NULL;
956
957 strtbl_void = elf_findsecbyname(elf, ".dynstr");
958
959 if (elf->phdr && strtbl_void) {
960 #define SHOW_NEEDED(B) \
961 if (elf->elf_class == ELFCLASS ## B) { \
962 Elf ## B ## _Dyn *dyn; \
963 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
964 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
965 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
966 Elf ## B ## _Off offset; \
967 size_t matched = 0; \
968 /* Walk all the program headers to find the PT_DYNAMIC */ \
969 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
970 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) \
971 continue; \
972 offset = EGET(phdr[i].p_offset); \
973 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
974 continue; \
975 /* Walk all the dynamic tags to find NEEDED entries */ \
976 dyn = DYN ## B (elf->vdata + offset); \
977 while (EGET(dyn->d_tag) != DT_NULL) { \
978 if (EGET(dyn->d_tag) == DT_NEEDED) { \
979 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
980 if (offset >= (Elf ## B ## _Off)elf->len) { \
981 ++dyn; \
982 continue; \
983 } \
984 needed = elf->data + offset; \
985 if (op == 0) { \
986 /* -n -> print all entries */ \
987 if (!be_wewy_wewy_quiet) { \
988 if (*found_needed) xchrcat(ret, ',', ret_len); \
989 if (use_ldpath) { \
990 if ((p = lookup_config_lib(elf, needed)) != NULL) \
991 needed = p; \
992 } else if (use_ldcache) { \
993 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
994 needed = p; \
995 } \
996 xstrcat(ret, needed, ret_len); \
997 } \
998 *found_needed = 1; \
999 } else { \
1000 /* -N -> print matching entries */ \
1001 size_t n; \
1002 const char *find_lib_name; \
1003 \
1004 array_for_each(find_lib_arr, n, find_lib_name) { \
1005 int invert = 1; \
1006 if (find_lib_name[0] == '!') \
1007 invert = 0, ++find_lib_name; \
1008 if (!strcmp(find_lib_name, needed) == invert) \
1009 ++matched; \
1010 } \
1011 \
1012 if (matched == array_cnt(find_lib_arr)) { \
1013 *found_lib = 1; \
1014 return (be_wewy_wewy_quiet ? NULL : find_lib); \
1015 } \
1016 } \
1017 } \
1018 ++dyn; \
1019 } \
1020 } }
1021 SHOW_NEEDED(32)
1022 SHOW_NEEDED(64)
1023 if (op == 0 && !*found_needed && be_verbose)
1024 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
1025 }
1026
1027 return NULL;
1028 }
1029 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
1030 {
1031 void *strtbl_void;
1032
1033 if (!show_interp) return NULL;
1034
1035 strtbl_void = elf_findsecbyname(elf, ".interp");
1036
1037 if (strtbl_void) {
1038 #define SHOW_INTERP(B) \
1039 if (elf->elf_class == ELFCLASS ## B) { \
1040 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
1041 *found_interp = 1; \
1042 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
1043 }
1044 SHOW_INTERP(32)
1045 SHOW_INTERP(64)
1046 }
1047 return NULL;
1048 }
1049 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
1050 {
1051 unsigned long i;
1052 struct stat s;
1053 char dynamic = 0;
1054
1055 if (!show_bind) return NULL;
1056 if (!elf->phdr) return NULL;
1057
1058 #define SHOW_BIND(B) \
1059 if (elf->elf_class == ELFCLASS ## B) { \
1060 Elf ## B ## _Dyn *dyn; \
1061 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1062 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1063 Elf ## B ## _Off offset; \
1064 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1065 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1066 dynamic = 1; \
1067 offset = EGET(phdr[i].p_offset); \
1068 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
1069 dyn = DYN ## B (elf->vdata + offset); \
1070 while (EGET(dyn->d_tag) != DT_NULL) { \
1071 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
1072 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
1073 { \
1074 if (be_quiet) return NULL; \
1075 *found_bind = 1; \
1076 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
1077 } \
1078 ++dyn; \
1079 } \
1080 } \
1081 }
1082 SHOW_BIND(32)
1083 SHOW_BIND(64)
1084
1085 if (be_wewy_wewy_quiet) return NULL;
1086
1087 /* don't output anything if quiet mode and the ELF is static or not setuid */
1088 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
1089 return NULL;
1090 } else {
1091 *found_bind = 1;
1092 return (char *)(dynamic ? "LAZY" : "STATIC");
1093 }
1094 }
1095 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
1096 {
1097 unsigned long i;
1098 char *soname;
1099 void *strtbl_void;
1100
1101 if (!show_soname) return NULL;
1102
1103 strtbl_void = elf_findsecbyname(elf, ".dynstr");
1104
1105 if (elf->phdr && strtbl_void) {
1106 #define SHOW_SONAME(B) \
1107 if (elf->elf_class == ELFCLASS ## B) { \
1108 Elf ## B ## _Dyn *dyn; \
1109 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1110 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1111 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
1112 Elf ## B ## _Off offset; \
1113 /* only look for soname in shared objects */ \
1114 if (EGET(ehdr->e_type) != ET_DYN) \
1115 return NULL; \
1116 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1117 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1118 offset = EGET(phdr[i].p_offset); \
1119 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
1120 dyn = DYN ## B (elf->vdata + offset); \
1121 while (EGET(dyn->d_tag) != DT_NULL) { \
1122 if (EGET(dyn->d_tag) == DT_SONAME) { \
1123 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
1124 if (offset >= (Elf ## B ## _Off)elf->len) { \
1125 ++dyn; \
1126 continue; \
1127 } \
1128 soname = elf->data + offset; \
1129 *found_soname = 1; \
1130 return (be_wewy_wewy_quiet ? NULL : soname); \
1131 } \
1132 ++dyn; \
1133 } \
1134 } }
1135 SHOW_SONAME(32)
1136 SHOW_SONAME(64)
1137 }
1138
1139 return NULL;
1140 }
1141
1142 /*
1143 * We support the symbol form:
1144 * [%[modifiers]%][[+-]<symbol name>][,[.....]]
1145 * If the symbol name is empty, then all symbols are matched.
1146 * If the symbol name is a glob ("*"), then all symbols are dumped (debug).
1147 * Do not rely on this output format at all.
1148 * Otherwise the symbol name is used to search (either regex or string compare).
1149 * If the first char of the symbol name is a plus ("+"), then only match
1150 * defined symbols. If it's a minus ("-"), only match undefined symbols.
1151 * Putting modifiers in between the percent signs allows for more in depth
1152 * filters. There are groups of modifiers. If you don't specify a member
1153 * of a group, then all types in that group are matched. The current
1154 * groups and their types are:
1155 * STT group: STT_NOTYPE:n STT_OBJECT:o STT_FUNC:f STT_FILE:F
1156 * STB group: STB_LOCAL:l STB_GLOBAL:g STB_WEAK:w
1157 * SHN group: SHN_UNDEF:u SHN_ABS:a SHN_COMMON:c {defined}:d
1158 * The "defined" value in the SHN group does not correspond to a SHN_xxx define.
1159 * You can search for multiple symbols at once by seperating with a comma (",").
1160 *
1161 * Some examples:
1162 * ELFs with a weak function "foo":
1163 * scanelf -s %wf%foo <ELFs>
1164 * ELFs that define the symbol "main":
1165 * scanelf -s +main <ELFs>
1166 * scanelf -s %d%main <ELFs>
1167 * ELFs that refer to the undefined symbol "brk":
1168 * scanelf -s -brk <ELFs>
1169 * scanelf -s %u%brk <ELFs>
1170 * All global defined objects in an ELF:
1171 * scanelf -s %ogd% <ELF>
1172 */
1173 static void
1174 scanelf_match_symname(elfobj *elf, char *found_sym, char **ret, size_t *ret_len, const char *symname,
1175 unsigned int stt, unsigned int stb, unsigned int shn, unsigned long size)
1176 {
1177 const char *this_sym;
1178 size_t n;
1179
1180 array_for_each(find_sym_arr, n, this_sym) {
1181 bool inc_notype, inc_object, inc_func, inc_file,
1182 inc_local, inc_global, inc_weak,
1183 inc_def, inc_undef, inc_abs, inc_common;
1184
1185 /* symbol selection! */
1186 inc_notype = inc_object = inc_func = inc_file = \
1187 inc_local = inc_global = inc_weak = \
1188 inc_def = inc_undef = inc_abs = inc_common = \
1189 (*this_sym != '%');
1190
1191 /* parse the contents of %...% */
1192 if (!inc_notype) {
1193 while (*(this_sym++)) {
1194 if (*this_sym == '%') {
1195 ++this_sym;
1196 break;
1197 }
1198 switch (*this_sym) {
1199 case 'n': inc_notype = true; break;
1200 case 'o': inc_object = true; break;
1201 case 'f': inc_func = true; break;
1202 case 'F': inc_file = true; break;
1203 case 'l': inc_local = true; break;
1204 case 'g': inc_global = true; break;
1205 case 'w': inc_weak = true; break;
1206 case 'd': inc_def = true; break;
1207 case 'u': inc_undef = true; break;
1208 case 'a': inc_abs = true; break;
1209 case 'c': inc_common = true; break;
1210 default: err("invalid symbol selector '%c'", *this_sym);
1211 }
1212 }
1213
1214 /* If no types are matched, not match all */
1215 if (!inc_notype && !inc_object && !inc_func && !inc_file)
1216 inc_notype = inc_object = inc_func = inc_file = true;
1217 if (!inc_local && !inc_global && !inc_weak)
1218 inc_local = inc_global = inc_weak = true;
1219 if (!inc_def && !inc_undef && !inc_abs && !inc_common)
1220 inc_def = inc_undef = inc_abs = inc_common = true;
1221
1222 /* backwards compat for defined/undefined short hand */
1223 } else if (*this_sym == '+') {
1224 inc_undef = false;
1225 ++this_sym;
1226 } else if (*this_sym == '-') {
1227 inc_def = inc_abs = inc_common = false;
1228 ++this_sym;
1229 }
1230
1231 /* filter symbols */
1232 if ((!inc_notype && stt == STT_NOTYPE) || \
1233 (!inc_object && stt == STT_OBJECT) || \
1234 (!inc_func && stt == STT_FUNC ) || \
1235 (!inc_file && stt == STT_FILE ) || \
1236 (!inc_local && stb == STB_LOCAL ) || \
1237 (!inc_global && stb == STB_GLOBAL) || \
1238 (!inc_weak && stb == STB_WEAK ) || \
1239 (!inc_def && shn && shn < SHN_LORESERVE) || \
1240 (!inc_undef && shn == SHN_UNDEF ) || \
1241 (!inc_abs && shn == SHN_ABS ) || \
1242 (!inc_common && shn == SHN_COMMON))
1243 continue;
1244
1245 if (*this_sym == '*') {
1246 /* a "*" symbol gets you debug output */
1247 printf("%s(%s) %5lX %15s %15s %15s %s\n",
1248 ((*found_sym == 0) ? "\n\t" : "\t"),
1249 elf->base_filename,
1250 size,
1251 get_elfstttype(stt),
1252 get_elfstbtype(stb),
1253 get_elfshntype(shn),
1254 symname);
1255 goto matched;
1256
1257 } else {
1258 if (g_match) {
1259 /* regex match the symbol */
1260 int flags = REG_EXTENDED | REG_NOSUB;
1261 if (g_match > 1)
1262 flags |= REG_ICASE;
1263 if (rematch(this_sym, symname, flags) != 0)
1264 continue;
1265
1266 } else if (*this_sym) {
1267 /* give empty symbols a "pass", else do a normal compare */
1268 const size_t len = strlen(this_sym);
1269 if (!(strncmp(this_sym, symname, len) == 0 &&
1270 /* Accept unversioned symbol names */
1271 (symname[len] == '\0' || symname[len] == '@')))
1272 continue;
1273 }
1274
1275 if (be_semi_verbose) {
1276 char buf[1024];
1277 snprintf(buf, sizeof(buf), "%lX %s %s",
1278 size,
1279 get_elfstttype(stt),
1280 this_sym);
1281 *ret = xstrdup(buf);
1282 } else {
1283 if (*ret) xchrcat(ret, ',', ret_len);
1284 xstrcat(ret, symname, ret_len);
1285 }
1286
1287 goto matched;
1288 }
1289 }
1290
1291 return;
1292
1293 matched:
1294 *found_sym = 1;
1295 }
1296
1297 static const char *scanelf_file_sym(elfobj *elf, char *found_sym)
1298 {
1299 char *ret;
1300 void *symtab_void, *strtab_void;
1301
1302 if (!find_sym) return NULL;
1303 ret = NULL;
1304
1305 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
1306
1307 if (symtab_void && strtab_void) {
1308 #define FIND_SYM(B) \
1309 if (elf->elf_class == ELFCLASS ## B) { \
1310 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
1311 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
1312 Elf ## B ## _Sym *sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
1313 Elf ## B ## _Word i, cnt = EGET(symtab->sh_entsize); \
1314 char *symname; \
1315 size_t ret_len = 0; \
1316 if (cnt) \
1317 cnt = EGET(symtab->sh_size) / cnt; \
1318 for (i = 0; i < cnt; ++i) { \
1319 if ((void*)sym > elf->data_end) { \
1320 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1321 goto break_out; \
1322 } \
1323 if (sym->st_name) { \
1324 /* make sure the symbol name is in acceptable memory range */ \
1325 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
1326 if ((void*)symname > elf->data_end) { \
1327 warnf("%s: corrupt ELF symbols", elf->filename); \
1328 ++sym; \
1329 continue; \
1330 } \
1331 scanelf_match_symname(elf, found_sym, \
1332 &ret, &ret_len, symname, \
1333 ELF##B##_ST_TYPE(EGET(sym->st_info)), \
1334 ELF##B##_ST_BIND(EGET(sym->st_info)), \
1335 EGET(sym->st_shndx), \
1336 /* st_size can be 64bit, but no one is really that big, so screw em */ \
1337 EGET(sym->st_size)); \
1338 } \
1339 ++sym; \
1340 } \
1341 }
1342 FIND_SYM(32)
1343 FIND_SYM(64)
1344 }
1345
1346 break_out:
1347 if (be_wewy_wewy_quiet) return NULL;
1348
1349 if (*find_sym != '*' && *found_sym)
1350 return ret;
1351 if (be_quiet)
1352 return NULL;
1353 else
1354 return " - ";
1355 }
1356
1357 static const char *scanelf_file_sections(elfobj *elf, char *found_section)
1358 {
1359 if (!find_section)
1360 return NULL;
1361
1362 #define FIND_SECTION(B) \
1363 if (elf->elf_class == ELFCLASS ## B) { \
1364 size_t matched, n; \
1365 int invert; \
1366 const char *section_name; \
1367 Elf ## B ## _Shdr *section; \
1368 \
1369 matched = 0; \
1370 array_for_each(find_section_arr, n, section_name) { \
1371 invert = (*section_name == '!' ? 1 : 0); \
1372 section = SHDR ## B (elf_findsecbyname(elf, section_name + invert)); \
1373 if ((section == NULL && invert) || (section != NULL && !invert)) \
1374 ++matched; \
1375 } \
1376 \
1377 if (matched == array_cnt(find_section_arr)) \
1378 *found_section = 1; \
1379 }
1380 FIND_SECTION(32)
1381 FIND_SECTION(64)
1382
1383 if (be_wewy_wewy_quiet)
1384 return NULL;
1385
1386 if (*found_section)
1387 return find_section;
1388
1389 if (be_quiet)
1390 return NULL;
1391 else
1392 return " - ";
1393 }
1394
1395 /* scan an elf file and show all the fun stuff */
1396 #define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
1397 static int scanelf_elfobj(elfobj *elf)
1398 {
1399 unsigned long i;
1400 char found_pax, found_phdr, found_relro, found_load, found_textrel,
1401 found_rpath, found_needed, found_interp, found_bind, found_soname,
1402 found_sym, found_lib, found_file, found_textrels, found_section;
1403 static char *out_buffer = NULL;
1404 static size_t out_len;
1405
1406 found_pax = found_phdr = found_relro = found_load = found_textrel = \
1407 found_rpath = found_needed = found_interp = found_bind = found_soname = \
1408 found_sym = found_lib = found_file = found_textrels = found_section = 0;
1409
1410 if (be_verbose > 2)
1411 printf("%s: scanning file {%s,%s}\n", elf->filename,
1412 get_elfeitype(EI_CLASS, elf->elf_class),
1413 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
1414 else if (be_verbose > 1)
1415 printf("%s: scanning file\n", elf->filename);
1416
1417 /* init output buffer */
1418 if (!out_buffer) {
1419 out_len = sizeof(char) * 80;
1420 out_buffer = xmalloc(out_len);
1421 }
1422 *out_buffer = '\0';
1423
1424 /* show the header */
1425 if (!be_quiet && show_banner) {
1426 for (i = 0; out_format[i]; ++i) {
1427 if (!IS_MODIFIER(out_format[i])) continue;
1428
1429 switch (out_format[++i]) {
1430 case '+': break;
1431 case '%': break;
1432 case '#': break;
1433 case 'F':
1434 case 'p':
1435 case 'f': prints("FILE "); found_file = 1; break;
1436 case 'o': prints(" TYPE "); break;
1437 case 'x': prints(" PAX "); break;
1438 case 'e': prints("STK/REL/PTL "); break;
1439 case 't': prints("TEXTREL "); break;
1440 case 'r': prints("RPATH "); break;
1441 case 'M': prints("CLASS "); break;
1442 case 'l':
1443 case 'n': prints("NEEDED "); break;
1444 case 'i': prints("INTERP "); break;
1445 case 'b': prints("BIND "); break;
1446 case 'Z': prints("SIZE "); break;
1447 case 'S': prints("SONAME "); break;
1448 case 's': prints("SYM "); break;
1449 case 'N': prints("LIB "); break;
1450 case 'T': prints("TEXTRELS "); break;
1451 case 'k': prints("SECTION "); break;
1452 case 'a': prints("ARCH "); break;
1453 case 'I': prints("OSABI "); break;
1454 case 'Y': prints("EABI "); break;
1455 case 'O': prints("PERM "); break;
1456 case 'D': prints("ENDIAN "); break;
1457 default: warnf("'%c' has no title ?", out_format[i]);
1458 }
1459 }
1460 if (!found_file) prints("FILE ");
1461 prints("\n");
1462 found_file = 0;
1463 show_banner = 0;
1464 }
1465
1466 /* dump all the good stuff */
1467 for (i = 0; out_format[i]; ++i) {
1468 const char *out;
1469 const char *tmp;
1470 static char ubuf[sizeof(unsigned long)*2];
1471 if (!IS_MODIFIER(out_format[i])) {
1472 xchrcat(&out_buffer, out_format[i], &out_len);
1473 continue;
1474 }
1475
1476 out = NULL;
1477 be_wewy_wewy_quiet = (out_format[i] == '#');
1478 be_semi_verbose = (out_format[i] == '+');
1479 switch (out_format[++i]) {
1480 case '+':
1481 case '%':
1482 case '#':
1483 xchrcat(&out_buffer, out_format[i], &out_len); break;
1484 case 'F':
1485 found_file = 1;
1486 if (be_wewy_wewy_quiet) break;
1487 xstrcat(&out_buffer, elf->filename, &out_len);
1488 break;
1489 case 'p':
1490 found_file = 1;
1491 if (be_wewy_wewy_quiet) break;
1492 tmp = elf->filename;
1493 if (search_path) {
1494 ssize_t len_search = strlen(search_path);
1495 ssize_t len_file = strlen(elf->filename);
1496 if (!strncmp(elf->filename, search_path, len_search) && \
1497 len_file > len_search)
1498 tmp += len_search;
1499 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1500 }
1501 xstrcat(&out_buffer, tmp, &out_len);
1502 break;
1503 case 'f':
1504 found_file = 1;
1505 if (be_wewy_wewy_quiet) break;
1506 tmp = strrchr(elf->filename, '/');
1507 tmp = (tmp == NULL ? elf->filename : tmp+1);
1508 xstrcat(&out_buffer, tmp, &out_len);
1509 break;
1510 case 'o': out = get_elfetype(elf); break;
1511 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
1512 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
1513 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1514 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
1515 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1516 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1517 case 'D': out = get_endian(elf); break;
1518 case 'O': out = strfileperms(elf->filename); break;
1519 case 'n':
1520 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
1521 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1522 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1523 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
1524 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1525 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1526 case 'a': out = get_elfemtype(elf); break;
1527 case 'I': out = get_elfosabi(elf); break;
1528 case 'Y': out = get_elf_eabi(elf); break;
1529 case 'Z': snprintf(ubuf, sizeof(ubuf), "%lu", (unsigned long)elf->len); out = ubuf; break;;
1530 default: warnf("'%c' has no scan code?", out_format[i]);
1531 }
1532 if (out)
1533 xstrcat(&out_buffer, out, &out_len);
1534 }
1535
1536 #define FOUND_SOMETHING() \
1537 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1538 found_rpath || found_needed || found_interp || found_bind || \
1539 found_soname || found_sym || found_lib || found_textrels || found_section )
1540
1541 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1542 xchrcat(&out_buffer, ' ', &out_len);
1543 xstrcat(&out_buffer, elf->filename, &out_len);
1544 }
1545 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
1546 puts(out_buffer);
1547 fflush(stdout);
1548 }
1549
1550 return 0;
1551 }
1552
1553 /* scan a single elf */
1554 static int scanelf_elf(const char *filename, int fd, size_t len)
1555 {
1556 int ret = 1;
1557 elfobj *elf;
1558
1559 /* verify this is real ELF */
1560 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1561 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1562 return 2;
1563 }
1564 switch (match_bits) {
1565 case 32:
1566 if (elf->elf_class != ELFCLASS32)
1567 goto label_done;
1568 break;
1569 case 64:
1570 if (elf->elf_class != ELFCLASS64)
1571 goto label_done;
1572 break;
1573 default: break;
1574 }
1575 if (match_etypes) {
1576 char sbuf[126];
1577 strncpy(sbuf, match_etypes, sizeof(sbuf));
1578 if (strchr(match_etypes, ',') != NULL) {
1579 char *p;
1580 while ((p = strrchr(sbuf, ',')) != NULL) {
1581 *p = 0;
1582 if (etype_lookup(p+1) == get_etype(elf))
1583 goto label_ret;
1584 }
1585 }
1586 if (etype_lookup(sbuf) != get_etype(elf))
1587 goto label_done;
1588 }
1589
1590 label_ret:
1591 ret = scanelf_elfobj(elf);
1592
1593 label_done:
1594 unreadelf(elf);
1595 return ret;
1596 }
1597
1598 /* scan an archive of elfs */
1599 static int scanelf_archive(const char *filename, int fd, size_t len)
1600 {
1601 archive_handle *ar;
1602 archive_member *m;
1603 char *ar_buffer;
1604 elfobj *elf;
1605
1606 ar = ar_open_fd(filename, fd);
1607 if (ar == NULL)
1608 return 1;
1609
1610 ar_buffer = mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1611 while ((m = ar_next(ar)) != NULL) {
1612 off_t cur_pos = lseek(fd, 0, SEEK_CUR);
1613 if (cur_pos == -1)
1614 errp("lseek() failed");
1615 elf = readelf_buffer(m->name, ar_buffer + cur_pos, m->size);
1616 if (elf) {
1617 scanelf_elfobj(elf);
1618 unreadelf(elf);
1619 }
1620 }
1621 munmap(ar_buffer, len);
1622
1623 return 0;
1624 }
1625 /* scan a file which may be an elf or an archive or some other magical beast */
1626 static int scanelf_fileat(int dir_fd, const char *filename, const struct stat *st_cache)
1627 {
1628 const struct stat *st = st_cache;
1629 struct stat symlink_st;
1630 int fd;
1631
1632 /* always handle regular files and handle symlinked files if no -y */
1633 if (S_ISLNK(st->st_mode)) {
1634 if (!scan_symlink)
1635 return 1;
1636 fstatat(dir_fd, filename, &symlink_st, 0);
1637 st = &symlink_st;
1638 }
1639
1640 if (!S_ISREG(st->st_mode)) {
1641 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1642 return 1;
1643 }
1644
1645 if (match_perms) {
1646 if ((st->st_mode | match_perms) != st->st_mode)
1647 return 1;
1648 }
1649 fd = openat(dir_fd, filename, (fix_elf ? O_RDWR : O_RDONLY) | O_CLOEXEC);
1650 if (fd == -1) {
1651 if (fix_elf && errno == ETXTBSY)
1652 warnp("%s: could not fix", filename);
1653 else if (be_verbose > 2)
1654 printf("%s: skipping file: %s\n", filename, strerror(errno));
1655 return 1;
1656 }
1657
1658 if (scanelf_elf(filename, fd, st->st_size) == 2) {
1659 /* if it isn't an ELF, maybe it's an .a archive */
1660 if (scan_archives)
1661 scanelf_archive(filename, fd, st->st_size);
1662
1663 /*
1664 * unreadelf() implicitly closes its fd, so only close it
1665 * when we are returning it in the non-ELF case
1666 */
1667 close(fd);
1668 }
1669
1670 return 0;
1671 }
1672
1673 /* scan a directory for ET_EXEC files and print when we find one */
1674 static int scanelf_dirat(int dir_fd, const char *path)
1675 {
1676 register DIR *dir;
1677 register struct dirent *dentry;
1678 struct stat st_top, st;
1679 char buf[__PAX_UTILS_PATH_MAX], *subpath;
1680 size_t pathlen = 0, len = 0;
1681 int ret = 0;
1682 int subdir_fd;
1683
1684 /* make sure path exists */
1685 if (fstatat(dir_fd, path, &st_top, AT_SYMLINK_NOFOLLOW) == -1) {
1686 if (be_verbose > 2) printf("%s: does not exist\n", path);
1687 return 1;
1688 }
1689
1690 /* ok, if it isn't a directory, assume we can open it */
1691 if (!S_ISDIR(st_top.st_mode))
1692 return scanelf_fileat(dir_fd, path, &st_top);
1693
1694 /* now scan the dir looking for fun stuff */
1695 subdir_fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
1696 if (subdir_fd == -1)
1697 dir = NULL;
1698 else
1699 dir = fdopendir(subdir_fd);
1700 if (dir == NULL) {
1701 if (subdir_fd != -1)
1702 close(subdir_fd);
1703 warnfp("could not opendir(%s)", path);
1704 return 1;
1705 }
1706 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1707
1708 subpath = stpcpy(buf, path);
1709 if (subpath[-1] != '/')
1710 *subpath++ = '/';
1711 pathlen = subpath - buf;
1712 while ((dentry = readdir(dir))) {
1713 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1714 continue;
1715
1716 if (fstatat(subdir_fd, dentry->d_name, &st, AT_SYMLINK_NOFOLLOW) == -1)
1717 continue;
1718
1719 len = strlen(dentry->d_name);
1720 if (len + pathlen + 1 >= sizeof(buf)) {
1721 warnf("Skipping '%s%s': len > sizeof(buf); %zu > %zu\n",
1722 path, dentry->d_name, len + pathlen + 1, sizeof(buf));
1723 continue;
1724 }
1725 memcpy(subpath, dentry->d_name, len);
1726 subpath[len] = '\0';
1727
1728 if (S_ISREG(st.st_mode))
1729 ret = scanelf_fileat(dir_fd, buf, &st);
1730 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1731 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1732 ret = scanelf_dirat(dir_fd, buf);
1733 }
1734 }
1735 closedir(dir);
1736
1737 return ret;
1738 }
1739 static int scanelf_dir(const char *path)
1740 {
1741 return scanelf_dirat(root_fd, root_rel_path(path));
1742 }
1743
1744 static int scanelf_from_file(const char *filename)
1745 {
1746 FILE *fp;
1747 char *p, *path;
1748 size_t len;
1749 int ret;
1750
1751 if (strcmp(filename, "-") == 0)
1752 fp = stdin;
1753 else if ((fp = fopen(filename, "r")) == NULL)
1754 return 1;
1755
1756 path = NULL;
1757 len = 0;
1758 ret = 0;
1759 while (getline(&path, &len, fp) != -1) {
1760 if ((p = strchr(path, '\n')) != NULL)
1761 *p = 0;
1762 search_path = path;
1763 ret = scanelf_dir(path);
1764 }
1765 free(path);
1766
1767 if (fp != stdin)
1768 fclose(fp);
1769
1770 return ret;
1771 }
1772
1773 #if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1774
1775 static int _load_ld_cache_config(const char *fname)
1776 {
1777 FILE *fp = NULL;
1778 char *p, *path;
1779 size_t len;
1780 int curr_fd = -1;
1781
1782 fp = fopenat_r(root_fd, root_rel_path(fname));
1783 if (fp == NULL)
1784 return -1;
1785
1786 path = NULL;
1787 len = 0;
1788 while (getline(&path, &len, fp) != -1) {
1789 if ((p = strrchr(path, '\r')) != NULL)
1790 *p = 0;
1791 if ((p = strchr(path, '\n')) != NULL)
1792 *p = 0;
1793
1794 /* recursive includes of the same file will make this segfault. */
1795 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1796 glob_t gl;
1797 size_t x;
1798 const char *gpath;
1799
1800 /* re-use existing path buffer ... need to be creative */
1801 if (path[8] != '/')
1802 gpath = memcpy(path + 3, "/etc/", 5);
1803 else
1804 gpath = path + 8;
1805 if (root_fd != AT_FDCWD) {
1806 if (curr_fd == -1) {
1807 curr_fd = open(".", O_RDONLY|O_CLOEXEC);
1808 if (fchdir(root_fd))
1809 errp("unable to change to root dir");
1810 }
1811 gpath = root_rel_path(gpath);
1812 }
1813
1814 if (glob(gpath, 0, NULL, &gl) == 0) {
1815 for (x = 0; x < gl.gl_pathc; ++x) {
1816 /* try to avoid direct loops */
1817 if (strcmp(gl.gl_pathv[x], fname) == 0)
1818 continue;
1819 _load_ld_cache_config(gl.gl_pathv[x]);
1820 }
1821 globfree(&gl);
1822 }
1823
1824 /* failed globs are ignored by glibc */
1825 continue;
1826 }
1827
1828 if (*path != '/')
1829 continue;
1830
1831 xarraypush_str(ldpaths, path);
1832 }
1833 free(path);
1834
1835 fclose(fp);
1836
1837 if (curr_fd != -1) {
1838 if (fchdir(curr_fd))
1839 /* don't care */;
1840 close(curr_fd);
1841 }
1842
1843 return 0;
1844 }
1845
1846 #elif defined(__FreeBSD__) || defined(__DragonFly__)
1847
1848 static int _load_ld_cache_config(const char *fname)
1849 {
1850 FILE *fp = NULL;
1851 char *b = NULL, *p;
1852 struct elfhints_hdr hdr;
1853
1854 fp = fopenat_r(root_fd, root_rel_path(fname));
1855 if (fp == NULL)
1856 return -1;
1857
1858 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1859 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1860 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1861 {
1862 fclose(fp);
1863 return -1;
1864 }
1865
1866 b = xmalloc(hdr.dirlistlen + 1);
1867 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1868 fclose(fp);
1869 free(b);
1870 return -1;
1871 }
1872
1873 while ((p = strsep(&b, ":"))) {
1874 if (*p == '\0')
1875 continue;
1876 xarraypush_str(ldpaths, p);
1877 }
1878
1879 free(b);
1880 fclose(fp);
1881 return 0;
1882 }
1883
1884 #else
1885 #ifdef __ELF__
1886 #warning Cache config support not implemented for your target
1887 #endif
1888 static int _load_ld_cache_config(const char *fname)
1889 {
1890 return 0;
1891 }
1892 #endif
1893
1894 static void load_ld_cache_config(const char *fname)
1895 {
1896 bool scan_l, scan_ul, scan_ull;
1897 size_t n;
1898 const char *ldpath;
1899
1900 _load_ld_cache_config(fname);
1901
1902 scan_l = scan_ul = scan_ull = false;
1903 if (array_cnt(ldpaths)) {
1904 array_for_each(ldpaths, n, ldpath) {
1905 if (!scan_l && !strcmp(ldpath, "/lib")) scan_l = true;
1906 if (!scan_ul && !strcmp(ldpath, "/usr/lib")) scan_ul = true;
1907 if (!scan_ull && !strcmp(ldpath, "/usr/local/lib")) scan_ull = true;
1908 }
1909 }
1910
1911 if (!scan_l) xarraypush_str(ldpaths, "/lib");
1912 if (!scan_ul) xarraypush_str(ldpaths, "/usr/lib");
1913 if (!scan_ull) xarraypush_str(ldpaths, "/usr/local/lib");
1914 }
1915
1916 /* scan /etc/ld.so.conf for paths */
1917 static void scanelf_ldpath(void)
1918 {
1919 size_t n;
1920 const char *ldpath;
1921
1922 array_for_each(ldpaths, n, ldpath)
1923 scanelf_dir(ldpath);
1924 }
1925
1926 /* scan env PATH for paths */
1927 static void scanelf_envpath(void)
1928 {
1929 char *path, *p;
1930
1931 path = getenv("PATH");
1932 if (!path)
1933 err("PATH is not set in your env !");
1934 path = xstrdup(path);
1935
1936 while ((p = strrchr(path, ':')) != NULL) {
1937 scanelf_dir(p + 1);
1938 *p = 0;
1939 }
1940
1941 free(path);
1942 }
1943
1944 /* usage / invocation handling functions */ /* Free Flags: c d j u w G H J K P Q U W */
1945 #define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZCBhV"
1946 #define a_argument required_argument
1947 static struct option const long_opts[] = {
1948 {"path", no_argument, NULL, 'p'},
1949 {"ldpath", no_argument, NULL, 'l'},
1950 {"use-ldpath",no_argument, NULL, 129},
1951 {"root", a_argument, NULL, 128},
1952 {"recursive", no_argument, NULL, 'R'},
1953 {"mount", no_argument, NULL, 'm'},
1954 {"symlink", no_argument, NULL, 'y'},
1955 {"archives", no_argument, NULL, 'A'},
1956 {"ldcache", no_argument, NULL, 'L'},
1957 {"fix", no_argument, NULL, 'X'},
1958 {"setpax", a_argument, NULL, 'z'},
1959 {"pax", no_argument, NULL, 'x'},
1960 {"header", no_argument, NULL, 'e'},
1961 {"textrel", no_argument, NULL, 't'},
1962 {"rpath", no_argument, NULL, 'r'},
1963 {"needed", no_argument, NULL, 'n'},
1964 {"interp", no_argument, NULL, 'i'},
1965 {"bind", no_argument, NULL, 'b'},
1966 {"soname", no_argument, NULL, 'S'},
1967 {"symbol", a_argument, NULL, 's'},
1968 {"section", a_argument, NULL, 'k'},
1969 {"lib", a_argument, NULL, 'N'},
1970 {"gmatch", no_argument, NULL, 'g'},
1971 {"textrels", no_argument, NULL, 'T'},
1972 {"etype", a_argument, NULL, 'E'},
1973 {"bits", a_argument, NULL, 'M'},
1974 {"endian", no_argument, NULL, 'D'},
1975 {"osabi", no_argument, NULL, 'I'},
1976 {"eabi", no_argument, NULL, 'Y'},
1977 {"perms", a_argument, NULL, 'O'},
1978 {"size", no_argument, NULL, 'Z'},
1979 {"all", no_argument, NULL, 'a'},
1980 {"quiet", no_argument, NULL, 'q'},
1981 {"verbose", no_argument, NULL, 'v'},
1982 {"format", a_argument, NULL, 'F'},
1983 {"from", a_argument, NULL, 'f'},
1984 {"file", a_argument, NULL, 'o'},
1985 {"nocolor", no_argument, NULL, 'C'},
1986 {"nobanner", no_argument, NULL, 'B'},
1987 {"help", no_argument, NULL, 'h'},
1988 {"version", no_argument, NULL, 'V'},
1989 {NULL, no_argument, NULL, 0x0}
1990 };
1991
1992 static const char * const opts_help[] = {
1993 "Scan all directories in PATH environment",
1994 "Scan all directories in /etc/ld.so.conf",
1995 "Use ld.so.conf to show full path (use with -r/-n)",
1996 "Root directory (use with -l or -p)",
1997 "Scan directories recursively",
1998 "Don't recursively cross mount points",
1999 "Don't scan symlinks",
2000 "Scan archives (.a files)",
2001 "Utilize ld.so.cache to show full path (use with -r/-n)",
2002 "Try and 'fix' bad things (use with -r/-e)",
2003 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
2004 "Print PaX markings",
2005 "Print GNU_STACK/PT_LOAD markings",
2006 "Print TEXTREL information",
2007 "Print RPATH information",
2008 "Print NEEDED information",
2009 "Print INTERP information",
2010 "Print BIND information",
2011 "Print SONAME information",
2012 "Find a specified symbol",
2013 "Find a specified section",
2014 "Find a specified library",
2015 "Use regex rather than string compare (with -s); specify twice for case insensitive",
2016 "Locate cause of TEXTREL",
2017 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
2018 "Print only ELF files matching numeric bits",
2019 "Print Endianness",
2020 "Print OSABI",
2021 "Print EABI (EM_ARM Only)",
2022 "Print only ELF files matching octal permissions",
2023 "Print ELF file size",
2024 "Print all useful/simple info\n",
2025 "Only output 'bad' things",
2026 "Be verbose (can be specified more than once)",
2027 "Use specified format for output",
2028 "Read input stream from a filename",
2029 "Write output stream to a filename",
2030 "Don't emit color in output",
2031 "Don't display the header",
2032 "Print this help and exit",
2033 "Print version and exit",
2034 NULL
2035 };
2036
2037 /* display usage and exit */
2038 static void usage(int status)
2039 {
2040 unsigned long i;
2041 printf("* Scan ELF binaries for stuff\n\n"
2042 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
2043 printf("Options: -[%s]\n", PARSE_FLAGS);
2044 for (i = 0; long_opts[i].name; ++i) {
2045 /* first output the short flag if it has one */
2046 if (long_opts[i].val > '~')
2047 printf(" ");
2048 else
2049 printf(" -%c, ", long_opts[i].val);
2050
2051 /* then the long flag */
2052 if (long_opts[i].has_arg == no_argument)
2053 printf("--%-14s", long_opts[i].name);
2054 else
2055 printf("--%-7s <arg> ", long_opts[i].name);
2056
2057 /* finally the help text */
2058 printf("* %s\n", opts_help[i]);
2059 }
2060
2061 puts("\nFor more information, see the scanelf(1) manpage");
2062 exit(status);
2063 }
2064
2065 /* parse command line arguments and preform needed actions */
2066 #define do_pax_state(option, flag) \
2067 if (islower(option)) { \
2068 flags &= ~PF_##flag; \
2069 flags |= PF_NO##flag; \
2070 } else { \
2071 flags &= ~PF_NO##flag; \
2072 flags |= PF_##flag; \
2073 }
2074 static int parseargs(int argc, char *argv[])
2075 {
2076 int i;
2077 const char *from_file = NULL;
2078 int ret = 0;
2079 char load_cache_config = 0;
2080
2081 opterr = 0;
2082 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
2083 switch (i) {
2084
2085 case 'V':
2086 printf("pax-utils-%s: %s compiled %s\n%s\n"
2087 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
2088 VERSION, __FILE__, __DATE__, rcsid, argv0);
2089 exit(EXIT_SUCCESS);
2090 break;
2091 case 'h': usage(EXIT_SUCCESS); break;
2092 case 'f':
2093 if (from_file) warn("You prob don't want to specify -f twice");
2094 from_file = optarg;
2095 break;
2096 case 'E':
2097 match_etypes = optarg;
2098 break;
2099 case 'M':
2100 match_bits = atoi(optarg);
2101 if (match_bits == 0) {
2102 if (strcmp(optarg, "ELFCLASS32") == 0)
2103 match_bits = 32;
2104 if (strcmp(optarg, "ELFCLASS64") == 0)
2105 match_bits = 64;
2106 }
2107 break;
2108 case 'O':
2109 if (sscanf(optarg, "%o", &match_perms) == -1)
2110 match_bits = 0;
2111 break;
2112 case 'o': {
2113 if (freopen(optarg, "w", stdout) == NULL)
2114 errp("Could not freopen(%s)", optarg);
2115 break;
2116 }
2117 case 'k':
2118 xarraypush_str(find_section_arr, optarg);
2119 break;
2120 case 's': {
2121 /* historically, this was comma delimited */
2122 char *this_sym = strtok(optarg, ",");
2123 while (this_sym) {
2124 xarraypush_str(find_sym_arr, this_sym);
2125 this_sym = strtok(NULL, ",");
2126 }
2127 break;
2128 }
2129 case 'N':
2130 xarraypush_str(find_lib_arr, optarg);
2131 break;
2132 case 'F': {
2133 if (out_format) warn("You prob don't want to specify -F twice");
2134 out_format = optarg;
2135 break;
2136 }
2137 case 'z': {
2138 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
2139 size_t x;
2140
2141 for (x = 0; x < strlen(optarg); x++) {
2142 switch (optarg[x]) {
2143 case 'p':
2144 case 'P':
2145 do_pax_state(optarg[x], PAGEEXEC);
2146 break;
2147 case 's':
2148 case 'S':
2149 do_pax_state(optarg[x], SEGMEXEC);
2150 break;
2151 case 'm':
2152 case 'M':
2153 do_pax_state(optarg[x], MPROTECT);
2154 break;
2155 case 'e':
2156 case 'E':
2157 do_pax_state(optarg[x], EMUTRAMP);
2158 break;
2159 case 'r':
2160 case 'R':
2161 do_pax_state(optarg[x], RANDMMAP);
2162 break;
2163 case 'x':
2164 case 'X':
2165 do_pax_state(optarg[x], RANDEXEC);
2166 break;
2167 default:
2168 break;
2169 }
2170 }
2171 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
2172 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
2173 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
2174 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
2175 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
2176 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
2177 setpax = flags;
2178 break;
2179 }
2180 case 'Z': show_size = 1; break;
2181 case 'g': ++g_match; break;
2182 case 'L': load_cache_config = use_ldcache = 1; break;
2183 case 'y': scan_symlink = 0; break;
2184 case 'A': scan_archives = 1; break;
2185 case 'C': color_init(true); break;
2186 case 'B': show_banner = 0; break;
2187 case 'l': load_cache_config = scan_ldpath = 1; break;
2188 case 'p': scan_envpath = 1; break;
2189 case 'R': dir_recurse = 1; break;
2190 case 'm': dir_crossmount = 0; break;
2191 case 'X': ++fix_elf; break;
2192 case 'x': show_pax = 1; break;
2193 case 'e': show_phdr = 1; break;
2194 case 't': show_textrel = 1; break;
2195 case 'r': show_rpath = 1; break;
2196 case 'n': show_needed = 1; break;
2197 case 'i': show_interp = 1; break;
2198 case 'b': show_bind = 1; break;
2199 case 'S': show_soname = 1; break;
2200 case 'T': show_textrels = 1; break;
2201 case 'q': be_quiet = 1; break;
2202 case 'v': be_verbose = (be_verbose % 20) + 1; break;
2203 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
2204 case 'D': show_endian = 1; break;
2205 case 'I': show_osabi = 1; break;
2206 case 'Y': show_eabi = 1; break;
2207 case 128:
2208 root_fd = open(optarg, O_RDONLY|O_CLOEXEC);
2209 if (root_fd == -1)
2210 err("Could not open root: %s", optarg);
2211 break;
2212 case 129: load_cache_config = use_ldpath = 1; break;
2213 case ':':
2214 err("Option '%c' is missing parameter", optopt);
2215 case '?':
2216 err("Unknown option '%c' or argument missing", optopt);
2217 default:
2218 err("Unhandled option '%c'; please report this", i);
2219 }
2220 }
2221 if (show_textrels && be_verbose)
2222 has_objdump = bin_in_path("objdump");
2223 /* flatten arrays for display */
2224 if (array_cnt(find_sym_arr))
2225 find_sym = array_flatten_str(find_sym_arr);
2226 if (array_cnt(find_lib_arr))
2227 find_lib = array_flatten_str(find_lib_arr);
2228 if (array_cnt(find_section_arr))
2229 find_section = array_flatten_str(find_section_arr);
2230 /* let the format option override all other options */
2231 if (out_format) {
2232 show_pax = show_phdr = show_textrel = show_rpath = \
2233 show_needed = show_interp = show_bind = show_soname = \
2234 show_textrels = show_perms = show_endian = show_size = \
2235 show_osabi = show_eabi = 0;
2236 for (i = 0; out_format[i]; ++i) {
2237 if (!IS_MODIFIER(out_format[i])) continue;
2238
2239 switch (out_format[++i]) {
2240 case '+': break;
2241 case '%': break;
2242 case '#': break;
2243 case 'F': break;
2244 case 'p': break;
2245 case 'f': break;
2246 case 'k': break;
2247 case 's': break;
2248 case 'N': break;
2249 case 'o': break;
2250 case 'a': break;
2251 case 'M': break;
2252 case 'Z': show_size = 1; break;
2253 case 'D': show_endian = 1; break;
2254 case 'I': show_osabi = 1; break;
2255 case 'Y': show_eabi = 1; break;
2256 case 'O': show_perms = 1; break;
2257 case 'x': show_pax = 1; break;
2258 case 'e': show_phdr = 1; break;
2259 case 't': show_textrel = 1; break;
2260 case 'r': show_rpath = 1; break;
2261 case 'n': show_needed = 1; break;
2262 case 'i': show_interp = 1; break;
2263 case 'b': show_bind = 1; break;
2264 case 'S': show_soname = 1; break;
2265 case 'T': show_textrels = 1; break;
2266 default:
2267 err("invalid format specifier '%c' (byte %i)",
2268 out_format[i], i+1);
2269 }
2270 }
2271
2272 /* construct our default format */
2273 } else {
2274 size_t fmt_len = 30;
2275 out_format = xmalloc(sizeof(char) * fmt_len);
2276 *out_format = '\0';
2277 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
2278 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
2279 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
2280 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
2281 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
2282 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
2283 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
2284 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
2285 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
2286 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
2287 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
2288 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
2289 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
2290 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
2291 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
2292 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
2293 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
2294 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
2295 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
2296 }
2297 if (be_verbose > 2) printf("Format: %s\n", out_format);
2298
2299 /* now lets actually do the scanning */
2300 if (load_cache_config)
2301 load_ld_cache_config(__PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
2302 if (scan_ldpath) scanelf_ldpath();
2303 if (scan_envpath) scanelf_envpath();
2304 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
2305 from_file = "-";
2306 if (from_file) {
2307 scanelf_from_file(from_file);
2308 from_file = *argv;
2309 }
2310 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
2311 err("Nothing to scan !?");
2312 while (optind < argc) {
2313 search_path = argv[optind++];
2314 ret = scanelf_dir(search_path);
2315 }
2316
2317 /* clean up */
2318 xarrayfree(ldpaths);
2319 xarrayfree(find_sym_arr);
2320 xarrayfree(find_lib_arr);
2321 xarrayfree(find_section_arr);
2322 free(find_sym);
2323 free(find_lib);
2324 free(find_section);
2325
2326 if (ldcache != 0)
2327 munmap(ldcache, ldcache_size);
2328 return ret;
2329 }
2330
2331 static char **get_split_env(const char *envvar)
2332 {
2333 const char *delims = " \t\n";
2334 char **envvals = NULL;
2335 char *env, *s;
2336 int nentry;
2337
2338 if ((env = getenv(envvar)) == NULL)
2339 return NULL;
2340
2341 env = xstrdup(env);
2342 if (env == NULL)
2343 return NULL;
2344
2345 s = strtok(env, delims);
2346 if (s == NULL) {
2347 free(env);
2348 return NULL;
2349 }
2350
2351 nentry = 0;
2352 while (s != NULL) {
2353 ++nentry;
2354 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
2355 envvals[nentry-1] = s;
2356 s = strtok(NULL, delims);
2357 }
2358 envvals[nentry] = NULL;
2359
2360 /* don't want to free(env) as it contains the memory that backs
2361 * the envvals array of strings */
2362 return envvals;
2363 }
2364
2365 static void parseenv(void)
2366 {
2367 color_init(false);
2368 qa_textrels = get_split_env("QA_TEXTRELS");
2369 qa_execstack = get_split_env("QA_EXECSTACK");
2370 qa_wx_load = get_split_env("QA_WX_LOAD");
2371 }
2372
2373 #ifdef __PAX_UTILS_CLEANUP
2374 static void cleanup(void)
2375 {
2376 free(out_format);
2377 free(qa_textrels);
2378 free(qa_execstack);
2379 free(qa_wx_load);
2380 }
2381 #endif
2382
2383 int main(int argc, char *argv[])
2384 {
2385 int ret;
2386 if (argc < 2)
2387 usage(EXIT_FAILURE);
2388 parseenv();
2389 ret = parseargs(argc, argv);
2390 fclose(stdout);
2391 #ifdef __PAX_UTILS_CLEANUP
2392 cleanup();
2393 warn("The calls to add/delete heap should be off:\n"
2394 "\t- 1 due to the out_buffer not being freed in scanelf_fileat()\n"
2395 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
2396 #endif
2397 return ret;
2398 }
2399
2400 /* Match filename against entries in matchlist, return TRUE
2401 * if the file is listed */
2402 static int file_matches_list(const char *filename, char **matchlist)
2403 {
2404 char **file;
2405 char *match;
2406 char buf[__PAX_UTILS_PATH_MAX];
2407
2408 if (matchlist == NULL)
2409 return 0;
2410
2411 for (file = matchlist; *file != NULL; file++) {
2412 if (search_path) {
2413 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2414 match = buf;
2415 } else {
2416 match = *file;
2417 }
2418 if (fnmatch(match, filename, 0) == 0)
2419 return 1;
2420 }
2421 return 0;
2422 }

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