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Revision 1.243 - (show annotations) (download) (as text)
Sun Apr 29 05:41:14 2012 UTC (2 years, 6 months ago) by vapier
Branch: MAIN
Changes since 1.242: +4 -3 lines
File MIME type: text/x-csrc
only append a slash if there isnt one already #404003 by Slawomir Nizio

1 /*
2 * Copyright 2003-2007 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 1.242 2012/04/28 05:14:26 vapier Exp $
5 *
6 * Copyright 2003-2007 Ned Ludd - <solar@gentoo.org>
7 * Copyright 2004-2007 Mike Frysinger - <vapier@gentoo.org>
8 */
9
10 static const char rcsid[] = "$Id: scanelf.c,v 1.242 2012/04/28 05:14:26 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 char *find_lib = NULL;
50 static array_t _find_lib_arr = array_init_decl, *find_lib_arr = &_find_lib_arr;
51 static char *find_section = NULL;
52 static array_t _find_section_arr = array_init_decl, *find_section_arr = &_find_section_arr;
53 static char *out_format = NULL;
54 static char *search_path = NULL;
55 static char fix_elf = 0;
56 static char g_match = 0;
57 static char use_ldcache = 0;
58 static char use_ldpath = 0;
59
60 static char **qa_textrels = NULL;
61 static char **qa_execstack = NULL;
62 static char **qa_wx_load = NULL;
63 static int root_fd = AT_FDCWD;
64
65 static int match_bits = 0;
66 static unsigned int match_perms = 0;
67 static void *ldcache = NULL;
68 static size_t ldcache_size = 0;
69 static unsigned long setpax = 0UL;
70
71 static int has_objdump = 0;
72
73 /* find the path to a file by name */
74 static int bin_in_path(const char *fname)
75 {
76 char fullpath[__PAX_UTILS_PATH_MAX];
77 char *path, *p;
78
79 path = getenv("PATH");
80 if (!path)
81 return 0;
82
83 while ((p = strrchr(path, ':')) != NULL) {
84 snprintf(fullpath, sizeof(fullpath), "%s/%s", p + 1, fname);
85 *p = 0;
86 if (access(fullpath, R_OK) != -1)
87 return 1;
88 }
89
90 return 0;
91 }
92
93 static FILE *fopenat_r(int dir_fd, const char *path)
94 {
95 int fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
96 if (fd == -1)
97 return NULL;
98 return fdopen(fd, "re");
99 }
100
101 static const char *root_rel_path(const char *path)
102 {
103 /*
104 * openat() will ignore the dirfd if path starts with
105 * a /, so consume all of that noise
106 *
107 * XXX: we don't handle relative paths like ../ that
108 * break out of the --root option, but for now, just
109 * don't do that :P.
110 */
111 if (root_fd != AT_FDCWD) {
112 while (*path == '/')
113 ++path;
114 if (*path == '\0')
115 path = ".";
116 }
117
118 return path;
119 }
120
121 /* 1 on failure. 0 otherwise */
122 static int rematch(const char *regex, const char *match, int cflags)
123 {
124 regex_t preg;
125 int ret;
126
127 if ((match == NULL) || (regex == NULL))
128 return EXIT_FAILURE;
129
130 if ((ret = regcomp(&preg, regex, cflags))) {
131 char err[256];
132
133 if (regerror(ret, &preg, err, sizeof(err)))
134 fprintf(stderr, "regcomp failed: %s", err);
135 else
136 fprintf(stderr, "regcomp failed");
137
138 return EXIT_FAILURE;
139 }
140 ret = regexec(&preg, match, 0, NULL, 0);
141 regfree(&preg);
142
143 return ret;
144 }
145
146 /* sub-funcs for scanelf_fileat() */
147 static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **str)
148 {
149 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
150
151 /* debug sections */
152 void *symtab = elf_findsecbyname(elf, ".symtab");
153 void *strtab = elf_findsecbyname(elf, ".strtab");
154 /* runtime sections */
155 void *dynsym = elf_findsecbyname(elf, ".dynsym");
156 void *dynstr = elf_findsecbyname(elf, ".dynstr");
157
158 #define GET_SYMTABS(B) \
159 if (elf->elf_class == ELFCLASS ## B) { \
160 if (symtab && dynsym) { \
161 Elf ## B ## _Shdr *esymtab = symtab; \
162 Elf ## B ## _Shdr *edynsym = dynsym; \
163 *sym = (EGET(esymtab->sh_size) > EGET(edynsym->sh_size)) ? symtab : dynsym; \
164 } else \
165 *sym = symtab ? symtab : dynsym; \
166 if (strtab && dynstr) { \
167 Elf ## B ## _Shdr *estrtab = strtab; \
168 Elf ## B ## _Shdr *edynstr = dynstr; \
169 *str = (EGET(estrtab->sh_size) > EGET(edynstr->sh_size)) ? strtab : dynstr; \
170 } else \
171 *str = strtab ? strtab : dynstr; \
172 }
173 GET_SYMTABS(32)
174 GET_SYMTABS(64)
175
176 if (*sym && *str)
177 return;
178
179 /*
180 * damn, they're really going to make us work for it huh?
181 * reconstruct the section header info out of the dynamic
182 * tags so we can see what symbols this guy uses at runtime.
183 */
184 #define GET_SYMTABS_DT(B) \
185 if (elf->elf_class == ELFCLASS ## B) { \
186 size_t i; \
187 static Elf ## B ## _Shdr sym_shdr, str_shdr; \
188 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
189 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
190 Elf ## B ## _Addr vsym, vstr, vhash, vgnu_hash; \
191 Elf ## B ## _Dyn *dyn; \
192 Elf ## B ## _Off offset; \
193 \
194 /* lookup symbols used at runtime with DT_SYMTAB / DT_STRTAB */ \
195 vsym = vstr = vhash = vgnu_hash = 0; \
196 memset(&sym_shdr, 0, sizeof(sym_shdr)); \
197 memset(&str_shdr, 0, sizeof(str_shdr)); \
198 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
199 if (EGET(phdr[i].p_type) != PT_DYNAMIC) \
200 continue; \
201 \
202 offset = EGET(phdr[i].p_offset); \
203 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
204 continue; \
205 \
206 dyn = DYN ## B (elf->vdata + offset); \
207 while (EGET(dyn->d_tag) != DT_NULL) { \
208 switch (EGET(dyn->d_tag)) { \
209 case DT_SYMTAB: vsym = EGET(dyn->d_un.d_val); break; \
210 case DT_SYMENT: sym_shdr.sh_entsize = dyn->d_un.d_val; break; \
211 case DT_STRTAB: vstr = EGET(dyn->d_un.d_val); break; \
212 case DT_STRSZ: str_shdr.sh_size = dyn->d_un.d_val; break; \
213 case DT_HASH: vhash = EGET(dyn->d_un.d_val); break; \
214 /*case DT_GNU_HASH: vgnu_hash = EGET(dyn->d_un.d_val); break;*/ \
215 } \
216 ++dyn; \
217 } \
218 if (vsym && vstr) \
219 break; \
220 } \
221 if (!vsym || !vstr || !(vhash || vgnu_hash)) \
222 return; \
223 \
224 /* calc offset into the ELF by finding the load addr of the syms */ \
225 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
226 Elf ## B ## _Addr vaddr = EGET(phdr[i].p_vaddr); \
227 Elf ## B ## _Addr filesz = EGET(phdr[i].p_filesz); \
228 offset = EGET(phdr[i].p_offset); \
229 \
230 if (EGET(phdr[i].p_type) != PT_LOAD) \
231 continue; \
232 \
233 if (vhash >= vaddr && vhash < vaddr + filesz) { \
234 /* Scan the hash table to see how many entries we have */ \
235 Elf32_Word max_sym_idx = 0; \
236 Elf32_Word *hashtbl = elf->vdata + offset + (vhash - vaddr); \
237 Elf32_Word b, nbuckets = EGET(hashtbl[0]); \
238 Elf32_Word nchains = EGET(hashtbl[1]); \
239 Elf32_Word *buckets = &hashtbl[2]; \
240 Elf32_Word *chains = &buckets[nbuckets]; \
241 Elf32_Word sym_idx; \
242 \
243 for (b = 0; b < nbuckets; ++b) { \
244 if (!buckets[b]) \
245 continue; \
246 for (sym_idx = buckets[b]; sym_idx < nchains && sym_idx; sym_idx = chains[sym_idx]) \
247 if (max_sym_idx < sym_idx) \
248 max_sym_idx = sym_idx; \
249 } \
250 ESET(sym_shdr.sh_size, sym_shdr.sh_entsize * max_sym_idx); \
251 } \
252 \
253 if (vsym >= vaddr && vsym < vaddr + filesz) { \
254 ESET(sym_shdr.sh_offset, offset + (vsym - vaddr)); \
255 *sym = &sym_shdr; \
256 } \
257 \
258 if (vstr >= vaddr && vstr < vaddr + filesz) { \
259 ESET(str_shdr.sh_offset, offset + (vstr - vaddr)); \
260 *str = &str_shdr; \
261 } \
262 } \
263 }
264 GET_SYMTABS_DT(32)
265 GET_SYMTABS_DT(64)
266 }
267
268 static char *scanelf_file_pax(elfobj *elf, char *found_pax)
269 {
270 static char ret[7];
271 unsigned long i, shown;
272
273 if (!show_pax) return NULL;
274
275 shown = 0;
276 memset(&ret, 0, sizeof(ret));
277
278 if (elf->phdr) {
279 #define SHOW_PAX(B) \
280 if (elf->elf_class == ELFCLASS ## B) { \
281 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
282 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
283 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
284 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
285 continue; \
286 if (fix_elf && setpax) { \
287 /* set the paxctl flags */ \
288 ESET(phdr[i].p_flags, setpax); \
289 } \
290 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
291 continue; \
292 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
293 *found_pax = 1; \
294 ++shown; \
295 break; \
296 } \
297 }
298 SHOW_PAX(32)
299 SHOW_PAX(64)
300 }
301
302 /* Note: We do not support setting EI_PAX if not PT_PAX_FLAGS
303 * was found. This is known to break ELFs on glibc systems,
304 * and mainline PaX has deprecated use of this for a long time.
305 * We could support changing PT_GNU_STACK, but that doesn't
306 * seem like it's worth the effort. #411919
307 */
308
309 /* fall back to EI_PAX if no PT_PAX was found */
310 if (!*ret) {
311 static char *paxflags;
312 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
313 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
314 *found_pax = 1;
315 return (be_wewy_wewy_quiet ? NULL : paxflags);
316 }
317 strncpy(ret, paxflags, sizeof(ret));
318 }
319
320 if (be_wewy_wewy_quiet || (be_quiet && !shown))
321 return NULL;
322 else
323 return ret;
324 }
325
326 static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
327 {
328 static char ret[12];
329 char *found;
330 unsigned long i, shown, multi_stack, multi_relro, multi_load;
331 int max_pt_load;
332
333 if (!show_phdr) return NULL;
334
335 memcpy(ret, "--- --- ---\0", 12);
336
337 shown = 0;
338 multi_stack = multi_relro = multi_load = 0;
339 max_pt_load = elf_max_pt_load(elf);
340
341 #define NOTE_GNU_STACK ".note.GNU-stack"
342 #define SHOW_PHDR(B) \
343 if (elf->elf_class == ELFCLASS ## B) { \
344 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
345 Elf ## B ## _Off offset; \
346 uint32_t flags, check_flags; \
347 if (elf->phdr != NULL) { \
348 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
349 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
350 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
351 if (multi_stack++) \
352 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
353 if (file_matches_list(elf->filename, qa_execstack)) \
354 continue; \
355 found = found_phdr; \
356 offset = 0; \
357 check_flags = PF_X; \
358 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
359 if (multi_relro++) \
360 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
361 found = found_relro; \
362 offset = 4; \
363 check_flags = PF_X; \
364 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
365 if (EGET(ehdr->e_type) == ET_DYN || EGET(ehdr->e_type) == ET_EXEC) \
366 if (multi_load++ > max_pt_load) \
367 warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
368 if (file_matches_list(elf->filename, qa_wx_load)) \
369 continue; \
370 found = found_load; \
371 offset = 8; \
372 check_flags = PF_W|PF_X; \
373 } else \
374 continue; \
375 flags = EGET(phdr[i].p_flags); \
376 if (be_quiet && ((flags & check_flags) != check_flags)) \
377 continue; \
378 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
379 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
380 ret[3] = ret[7] = '!'; \
381 flags = EGET(phdr[i].p_flags); \
382 } \
383 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
384 *found = 1; \
385 ++shown; \
386 } \
387 } else if (elf->shdr != NULL) { \
388 /* no program headers which means this is prob an object file */ \
389 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
390 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
391 char *str; \
392 if ((void*)strtbl > elf->data_end) \
393 goto skip_this_shdr##B; \
394 check_flags = SHF_WRITE|SHF_EXECINSTR; \
395 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
396 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
397 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
398 str = elf->data + offset; \
399 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
400 if (!strcmp(str, NOTE_GNU_STACK)) { \
401 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
402 flags = EGET(shdr[i].sh_flags); \
403 if (be_quiet && ((flags & check_flags) != check_flags)) \
404 continue; \
405 ++*found_phdr; \
406 shown = 1; \
407 if (flags & SHF_WRITE) ret[0] = 'W'; \
408 if (flags & SHF_ALLOC) ret[1] = 'A'; \
409 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
410 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
411 break; \
412 } \
413 } \
414 skip_this_shdr##B: \
415 if (!multi_stack) { \
416 if (file_matches_list(elf->filename, qa_execstack)) \
417 return NULL; \
418 *found_phdr = 1; \
419 shown = 1; \
420 memcpy(ret, "!WX", 3); \
421 } \
422 } \
423 }
424 SHOW_PHDR(32)
425 SHOW_PHDR(64)
426
427 if (be_wewy_wewy_quiet || (be_quiet && !shown))
428 return NULL;
429 else
430 return ret;
431 }
432
433 /*
434 * See if this ELF contains a DT_TEXTREL tag in any of its
435 * PT_DYNAMIC sections.
436 */
437 static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
438 {
439 static const char *ret = "TEXTREL";
440 unsigned long i;
441
442 if (!show_textrel && !show_textrels) return NULL;
443
444 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
445
446 if (elf->phdr) {
447 #define SHOW_TEXTREL(B) \
448 if (elf->elf_class == ELFCLASS ## B) { \
449 Elf ## B ## _Dyn *dyn; \
450 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
451 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
452 Elf ## B ## _Off offset; \
453 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
454 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
455 offset = EGET(phdr[i].p_offset); \
456 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
457 dyn = DYN ## B (elf->vdata + offset); \
458 while (EGET(dyn->d_tag) != DT_NULL) { \
459 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
460 *found_textrel = 1; \
461 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
462 return (be_wewy_wewy_quiet ? NULL : ret); \
463 } \
464 ++dyn; \
465 } \
466 } }
467 SHOW_TEXTREL(32)
468 SHOW_TEXTREL(64)
469 }
470
471 if (be_quiet || be_wewy_wewy_quiet)
472 return NULL;
473 else
474 return " - ";
475 }
476
477 /*
478 * Scan the .text section to see if there are any relocations in it.
479 * Should rewrite this to check PT_LOAD sections that are marked
480 * Executable rather than the section named '.text'.
481 */
482 static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
483 {
484 unsigned long s, r, rmax;
485 void *symtab_void, *strtab_void, *text_void;
486
487 if (!show_textrels) return NULL;
488
489 /* don't search for TEXTREL's if the ELF doesn't have any */
490 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
491 if (!*found_textrel) return NULL;
492
493 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
494 text_void = elf_findsecbyname(elf, ".text");
495
496 if (symtab_void && strtab_void && text_void && elf->shdr) {
497 #define SHOW_TEXTRELS(B) \
498 if (elf->elf_class == ELFCLASS ## B) { \
499 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
500 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
501 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
502 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
503 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
504 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
505 uint ## B ## _t memsz = EGET(text->sh_size); \
506 Elf ## B ## _Rel *rel; \
507 Elf ## B ## _Rela *rela; \
508 /* search the section headers for relocations */ \
509 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
510 uint32_t sh_type = EGET(shdr[s].sh_type); \
511 if (sh_type == SHT_REL) { \
512 rel = REL ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
513 rela = NULL; \
514 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
515 } else if (sh_type == SHT_RELA) { \
516 rel = NULL; \
517 rela = RELA ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
518 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
519 } else \
520 continue; \
521 /* now see if any of the relocs are in the .text */ \
522 for (r = 0; r < rmax; ++r) { \
523 unsigned long sym_max; \
524 Elf ## B ## _Addr offset_tmp; \
525 Elf ## B ## _Sym *func; \
526 Elf ## B ## _Sym *sym; \
527 Elf ## B ## _Addr r_offset; \
528 uint ## B ## _t r_info; \
529 if (sh_type == SHT_REL) { \
530 r_offset = EGET(rel[r].r_offset); \
531 r_info = EGET(rel[r].r_info); \
532 } else { \
533 r_offset = EGET(rela[r].r_offset); \
534 r_info = EGET(rela[r].r_info); \
535 } \
536 /* make sure this relocation is inside of the .text */ \
537 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
538 if (be_verbose <= 2) continue; \
539 } else \
540 *found_textrels = 1; \
541 /* locate this relocation symbol name */ \
542 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
543 if ((void*)sym > elf->data_end) { \
544 warn("%s: corrupt ELF symbol", elf->filename); \
545 continue; \
546 } \
547 sym_max = ELF ## B ## _R_SYM(r_info); \
548 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
549 sym += sym_max; \
550 else \
551 sym = NULL; \
552 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
553 /* show the raw details about this reloc */ \
554 printf(" %s: ", elf->base_filename); \
555 if (sym && sym->st_name) \
556 printf("%s", elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
557 else \
558 printf("(memory/data?)"); \
559 printf(" [0x%lX]", (unsigned long)r_offset); \
560 /* now try to find the closest symbol that this rel is probably in */ \
561 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
562 func = NULL; \
563 offset_tmp = 0; \
564 while (sym_max--) { \
565 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
566 func = sym; \
567 offset_tmp = EGET(sym->st_value); \
568 } \
569 ++sym; \
570 } \
571 printf(" in "); \
572 if (func && func->st_name) { \
573 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
574 if (r_offset > EGET(func->st_size)) \
575 printf("(optimized out: previous %s)", func_name); \
576 else \
577 printf("%s", func_name); \
578 } else \
579 printf("(optimized out)"); \
580 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
581 if (be_verbose && has_objdump) { \
582 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
583 char *sysbuf; \
584 size_t syslen; \
585 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"; \
586 syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
587 sysbuf = xmalloc(syslen); \
588 if (end_addr < r_offset) \
589 /* not uncommon when things are optimized out */ \
590 end_addr = r_offset + 0x100; \
591 snprintf(sysbuf, syslen, sysfmt, \
592 (unsigned long)offset_tmp, \
593 (unsigned long)end_addr, \
594 elf->filename, \
595 (unsigned long)r_offset); \
596 fflush(stdout); \
597 if (system(sysbuf)) /* don't care */; \
598 fflush(stdout); \
599 free(sysbuf); \
600 } \
601 } \
602 } }
603 SHOW_TEXTRELS(32)
604 SHOW_TEXTRELS(64)
605 }
606 if (!*found_textrels)
607 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
608
609 return NULL;
610 }
611
612 static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
613 {
614 struct stat st;
615 switch (*item) {
616 case '/': break;
617 case '.':
618 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
619 break;
620 case ':':
621 case '\0':
622 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
623 break;
624 case '$':
625 if (fstat(elf->fd, &st) != -1)
626 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
627 warnf("Security problem with %s='%s' in %s with mode set of %o",
628 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
629 break;
630 default:
631 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
632 break;
633 }
634 }
635 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
636 {
637 unsigned long i;
638 char *rpath, *runpath, **r;
639 void *strtbl_void;
640
641 if (!show_rpath) return;
642
643 strtbl_void = elf_findsecbyname(elf, ".dynstr");
644 rpath = runpath = NULL;
645
646 if (elf->phdr && strtbl_void) {
647 #define SHOW_RPATH(B) \
648 if (elf->elf_class == ELFCLASS ## B) { \
649 Elf ## B ## _Dyn *dyn; \
650 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
651 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
652 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
653 Elf ## B ## _Off offset; \
654 Elf ## B ## _Xword word; \
655 /* Scan all the program headers */ \
656 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
657 /* Just scan dynamic headers */ \
658 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
659 offset = EGET(phdr[i].p_offset); \
660 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
661 /* Just scan dynamic RPATH/RUNPATH headers */ \
662 dyn = DYN ## B (elf->vdata + offset); \
663 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
664 if (word == DT_RPATH) { \
665 r = &rpath; \
666 } else if (word == DT_RUNPATH) { \
667 r = &runpath; \
668 } else { \
669 ++dyn; \
670 continue; \
671 } \
672 /* Verify the memory is somewhat sane */ \
673 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
674 if (offset < (Elf ## B ## _Off)elf->len) { \
675 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
676 *r = elf->data + offset; \
677 /* cache the length in case we need to nuke this section later on */ \
678 if (fix_elf) \
679 offset = strlen(*r); \
680 /* If quiet, don't output paths in ld.so.conf */ \
681 if (be_quiet) { \
682 size_t len; \
683 char *start, *end; \
684 /* note that we only 'chop' off leading known paths. */ \
685 /* since *r is read-only memory, we can only move the ptr forward. */ \
686 start = *r; \
687 /* scan each path in : delimited list */ \
688 while (start) { \
689 rpath_security_checks(elf, start, get_elfdtype(word)); \
690 end = strchr(start, ':'); \
691 len = (end ? abs(end - start) : strlen(start)); \
692 if (use_ldcache) { \
693 size_t n; \
694 const char *ldpath; \
695 array_for_each(ldpaths, n, ldpath) \
696 if (!strncmp(ldpath, start, len) && !ldpath[len]) { \
697 *r = end; \
698 /* corner case ... if RPATH reads "/usr/lib:", we want \
699 * to show ':' rather than '' */ \
700 if (end && end[1] != '\0') \
701 (*r)++; \
702 break; \
703 } \
704 } \
705 if (!*r || !end) \
706 break; \
707 else \
708 start = start + len + 1; \
709 } \
710 } \
711 if (*r) { \
712 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
713 /* just nuke it */ \
714 nuke_it##B: \
715 memset(*r, 0x00, offset); \
716 *r = NULL; \
717 ESET(dyn->d_tag, DT_DEBUG); \
718 ESET(dyn->d_un.d_ptr, 0); \
719 } else if (fix_elf) { \
720 /* try to clean "bad" paths */ \
721 size_t len, tmpdir_len; \
722 char *start, *end; \
723 const char *tmpdir; \
724 start = *r; \
725 tmpdir = (getenv("TMPDIR") ? : "."); \
726 tmpdir_len = strlen(tmpdir); \
727 while (1) { \
728 end = strchr(start, ':'); \
729 if (start == end) { \
730 eat_this_path##B: \
731 len = strlen(end); \
732 memmove(start, end+1, len); \
733 start[len-1] = '\0'; \
734 end = start - 1; \
735 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
736 if (!end) { \
737 if (start == *r) \
738 goto nuke_it##B; \
739 *--start = '\0'; \
740 } else \
741 goto eat_this_path##B; \
742 } \
743 if (!end) \
744 break; \
745 start = end + 1; \
746 } \
747 if (**r == '\0') \
748 goto nuke_it##B; \
749 } \
750 if (*r) \
751 *found_rpath = 1; \
752 } \
753 } \
754 ++dyn; \
755 } \
756 } }
757 SHOW_RPATH(32)
758 SHOW_RPATH(64)
759 }
760
761 if (be_wewy_wewy_quiet) return;
762
763 if (rpath && runpath) {
764 if (!strcmp(rpath, runpath)) {
765 xstrcat(ret, runpath, ret_len);
766 } else {
767 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
768 xchrcat(ret, '{', ret_len);
769 xstrcat(ret, rpath, ret_len);
770 xchrcat(ret, ',', ret_len);
771 xstrcat(ret, runpath, ret_len);
772 xchrcat(ret, '}', ret_len);
773 }
774 } else if (rpath || runpath)
775 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
776 else if (!be_quiet)
777 xstrcat(ret, " - ", ret_len);
778 }
779
780 #define LDSO_CACHE_MAGIC "ld.so-"
781 #define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
782 #define LDSO_CACHE_VER "1.7.0"
783 #define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
784 #define FLAG_ANY -1
785 #define FLAG_TYPE_MASK 0x00ff
786 #define FLAG_LIBC4 0x0000
787 #define FLAG_ELF 0x0001
788 #define FLAG_ELF_LIBC5 0x0002
789 #define FLAG_ELF_LIBC6 0x0003
790 #define FLAG_REQUIRED_MASK 0xff00
791 #define FLAG_SPARC_LIB64 0x0100
792 #define FLAG_IA64_LIB64 0x0200
793 #define FLAG_X8664_LIB64 0x0300
794 #define FLAG_S390_LIB64 0x0400
795 #define FLAG_POWERPC_LIB64 0x0500
796 #define FLAG_MIPS64_LIBN32 0x0600
797 #define FLAG_MIPS64_LIBN64 0x0700
798
799 #if defined(__GLIBC__) || defined(__UCLIBC__)
800
801 static char *lookup_cache_lib(elfobj *elf, const char *fname)
802 {
803 int fd;
804 char *strs;
805 static char buf[__PAX_UTILS_PATH_MAX] = "";
806 const char *cachefile = root_rel_path("/etc/ld.so.cache");
807 struct stat st;
808
809 typedef struct {
810 char magic[LDSO_CACHE_MAGIC_LEN];
811 char version[LDSO_CACHE_VER_LEN];
812 int nlibs;
813 } header_t;
814 header_t *header;
815
816 typedef struct {
817 int flags;
818 int sooffset;
819 int liboffset;
820 } libentry_t;
821 libentry_t *libent;
822
823 if (fname == NULL)
824 return NULL;
825
826 if (ldcache == NULL) {
827 if (fstatat(root_fd, cachefile, &st, 0))
828 return NULL;
829
830 fd = openat(root_fd, cachefile, O_RDONLY);
831 if (fd == -1)
832 return NULL;
833
834 /* cache these values so we only map/unmap the cache file once */
835 ldcache_size = st.st_size;
836 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
837 close(fd);
838
839 if (ldcache == MAP_FAILED) {
840 ldcache = NULL;
841 return NULL;
842 }
843
844 if (memcmp(header->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN) ||
845 memcmp(header->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
846 {
847 munmap(ldcache, ldcache_size);
848 ldcache = NULL;
849 return NULL;
850 }
851 } else
852 header = ldcache;
853
854 libent = ldcache + sizeof(header_t);
855 strs = (char *) &libent[header->nlibs];
856
857 for (fd = 0; fd < header->nlibs; ++fd) {
858 /* This should be more fine grained, but for now we assume that
859 * diff arches will not be cached together, and we ignore the
860 * the different multilib mips cases.
861 */
862 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
863 continue;
864 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
865 continue;
866
867 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
868 continue;
869
870 /* Return first hit because that is how the ldso rolls */
871 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
872 break;
873 }
874
875 return buf;
876 }
877
878 #elif defined(__NetBSD__)
879 static char *lookup_cache_lib(elfobj *elf, const char *fname)
880 {
881 static char buf[__PAX_UTILS_PATH_MAX] = "";
882 static struct stat st;
883 size_t n;
884 char *ldpath;
885
886 array_for_each(ldpath, n, ldpath) {
887 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", ldpath, fname) >= sizeof(buf))
888 continue; /* if the pathname is too long, or something went wrong, ignore */
889
890 if (stat(buf, &st) != 0)
891 continue; /* if the lib doesn't exist in *ldpath, look further */
892
893 /* NetBSD doesn't actually do sanity checks, it just loads the file
894 * and if that doesn't work, continues looking in other directories.
895 * This cannot easily be safely emulated, unfortunately. For now,
896 * just assume that if it exists, it's a valid library. */
897
898 return buf;
899 }
900
901 /* not found in any path */
902 return NULL;
903 }
904 #else
905 #ifdef __ELF__
906 #warning Cache support not implemented for your target
907 #endif
908 static char *lookup_cache_lib(elfobj *elf, const char *fname)
909 {
910 return NULL;
911 }
912 #endif
913
914 static char *lookup_config_lib(elfobj *elf, char *fname)
915 {
916 static char buf[__PAX_UTILS_PATH_MAX] = "";
917 const char *ldpath;
918 size_t n;
919
920 array_for_each(ldpaths, n, ldpath) {
921 snprintf(buf, sizeof(buf), "%s/%s", root_rel_path(ldpath), fname);
922 if (faccessat(root_fd, buf, F_OK, AT_SYMLINK_NOFOLLOW) == 0)
923 return buf;
924 }
925
926 return NULL;
927 }
928
929 static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
930 {
931 unsigned long i;
932 char *needed;
933 void *strtbl_void;
934 char *p;
935
936 /*
937 * -n -> op==0 -> print all
938 * -N -> op==1 -> print requested
939 */
940 if ((op == 0 && !show_needed) || (op == 1 && !find_lib))
941 return NULL;
942
943 strtbl_void = elf_findsecbyname(elf, ".dynstr");
944
945 if (elf->phdr && strtbl_void) {
946 #define SHOW_NEEDED(B) \
947 if (elf->elf_class == ELFCLASS ## B) { \
948 Elf ## B ## _Dyn *dyn; \
949 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
950 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
951 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
952 Elf ## B ## _Off offset; \
953 size_t matched = 0; \
954 /* Walk all the program headers to find the PT_DYNAMIC */ \
955 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
956 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) \
957 continue; \
958 offset = EGET(phdr[i].p_offset); \
959 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
960 continue; \
961 /* Walk all the dynamic tags to find NEEDED entries */ \
962 dyn = DYN ## B (elf->vdata + offset); \
963 while (EGET(dyn->d_tag) != DT_NULL) { \
964 if (EGET(dyn->d_tag) == DT_NEEDED) { \
965 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
966 if (offset >= (Elf ## B ## _Off)elf->len) { \
967 ++dyn; \
968 continue; \
969 } \
970 needed = elf->data + offset; \
971 if (op == 0) { \
972 /* -n -> print all entries */ \
973 if (!be_wewy_wewy_quiet) { \
974 if (*found_needed) xchrcat(ret, ',', ret_len); \
975 if (use_ldpath) { \
976 if ((p = lookup_config_lib(elf, needed)) != NULL) \
977 needed = p; \
978 } else if (use_ldcache) { \
979 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
980 needed = p; \
981 } \
982 xstrcat(ret, needed, ret_len); \
983 } \
984 *found_needed = 1; \
985 } else { \
986 /* -N -> print matching entries */ \
987 size_t n; \
988 const char *find_lib_name; \
989 \
990 array_for_each(find_lib_arr, n, find_lib_name) { \
991 int invert = 1; \
992 if (find_lib_name[0] == '!') \
993 invert = 0, ++find_lib_name; \
994 if (!strcmp(find_lib_name, needed) == invert) \
995 ++matched; \
996 } \
997 \
998 if (matched == array_cnt(find_lib_arr)) { \
999 *found_lib = 1; \
1000 return (be_wewy_wewy_quiet ? NULL : find_lib); \
1001 } \
1002 } \
1003 } \
1004 ++dyn; \
1005 } \
1006 } }
1007 SHOW_NEEDED(32)
1008 SHOW_NEEDED(64)
1009 if (op == 0 && !*found_needed && be_verbose)
1010 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
1011 }
1012
1013 return NULL;
1014 }
1015 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
1016 {
1017 void *strtbl_void;
1018
1019 if (!show_interp) return NULL;
1020
1021 strtbl_void = elf_findsecbyname(elf, ".interp");
1022
1023 if (strtbl_void) {
1024 #define SHOW_INTERP(B) \
1025 if (elf->elf_class == ELFCLASS ## B) { \
1026 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
1027 *found_interp = 1; \
1028 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
1029 }
1030 SHOW_INTERP(32)
1031 SHOW_INTERP(64)
1032 }
1033 return NULL;
1034 }
1035 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
1036 {
1037 unsigned long i;
1038 struct stat s;
1039 char dynamic = 0;
1040
1041 if (!show_bind) return NULL;
1042 if (!elf->phdr) return NULL;
1043
1044 #define SHOW_BIND(B) \
1045 if (elf->elf_class == ELFCLASS ## B) { \
1046 Elf ## B ## _Dyn *dyn; \
1047 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1048 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1049 Elf ## B ## _Off offset; \
1050 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1051 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1052 dynamic = 1; \
1053 offset = EGET(phdr[i].p_offset); \
1054 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
1055 dyn = DYN ## B (elf->vdata + offset); \
1056 while (EGET(dyn->d_tag) != DT_NULL) { \
1057 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
1058 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
1059 { \
1060 if (be_quiet) return NULL; \
1061 *found_bind = 1; \
1062 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
1063 } \
1064 ++dyn; \
1065 } \
1066 } \
1067 }
1068 SHOW_BIND(32)
1069 SHOW_BIND(64)
1070
1071 if (be_wewy_wewy_quiet) return NULL;
1072
1073 /* don't output anything if quiet mode and the ELF is static or not setuid */
1074 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
1075 return NULL;
1076 } else {
1077 *found_bind = 1;
1078 return (char *)(dynamic ? "LAZY" : "STATIC");
1079 }
1080 }
1081 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
1082 {
1083 unsigned long i;
1084 char *soname;
1085 void *strtbl_void;
1086
1087 if (!show_soname) return NULL;
1088
1089 strtbl_void = elf_findsecbyname(elf, ".dynstr");
1090
1091 if (elf->phdr && strtbl_void) {
1092 #define SHOW_SONAME(B) \
1093 if (elf->elf_class == ELFCLASS ## B) { \
1094 Elf ## B ## _Dyn *dyn; \
1095 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1096 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1097 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
1098 Elf ## B ## _Off offset; \
1099 /* only look for soname in shared objects */ \
1100 if (EGET(ehdr->e_type) != ET_DYN) \
1101 return NULL; \
1102 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1103 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1104 offset = EGET(phdr[i].p_offset); \
1105 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
1106 dyn = DYN ## B (elf->vdata + offset); \
1107 while (EGET(dyn->d_tag) != DT_NULL) { \
1108 if (EGET(dyn->d_tag) == DT_SONAME) { \
1109 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
1110 if (offset >= (Elf ## B ## _Off)elf->len) { \
1111 ++dyn; \
1112 continue; \
1113 } \
1114 soname = elf->data + offset; \
1115 *found_soname = 1; \
1116 return (be_wewy_wewy_quiet ? NULL : soname); \
1117 } \
1118 ++dyn; \
1119 } \
1120 } }
1121 SHOW_SONAME(32)
1122 SHOW_SONAME(64)
1123 }
1124
1125 return NULL;
1126 }
1127
1128 /*
1129 * We support the symbol form:
1130 * [%[modifiers]%][[+-]<symbol name>][,[.....]]
1131 * If the symbol name is empty, then all symbols are matched.
1132 * If the symbol name is a glob ("*"), then all symbols are dumped (debug).
1133 * Do not rely on this output format at all.
1134 * Otherwise the symbol name is used to search (either regex or string compare).
1135 * If the first char of the symbol name is a plus ("+"), then only match
1136 * defined symbols. If it's a minus ("-"), only match undefined symbols.
1137 * Putting modifiers in between the percent signs allows for more in depth
1138 * filters. There are groups of modifiers. If you don't specify a member
1139 * of a group, then all types in that group are matched. The current
1140 * groups and their types are:
1141 * STT group: STT_NOTYPE:n STT_OBJECT:o STT_FUNC:f STT_FILE:F
1142 * STB group: STB_LOCAL:l STB_GLOBAL:g STB_WEAK:w
1143 * SHN group: SHN_UNDEF:u SHN_ABS:a SHN_COMMON:c {defined}:d
1144 * The "defined" value in the SHN group does not correspond to a SHN_xxx define.
1145 * You can search for multiple symbols at once by seperating with a comma (",").
1146 *
1147 * Some examples:
1148 * ELFs with a weak function "foo":
1149 * scanelf -s %wf%foo <ELFs>
1150 * ELFs that define the symbol "main":
1151 * scanelf -s +main <ELFs>
1152 * scanelf -s %d%main <ELFs>
1153 * ELFs that refer to the undefined symbol "brk":
1154 * scanelf -s -brk <ELFs>
1155 * scanelf -s %u%brk <ELFs>
1156 * All global defined objects in an ELF:
1157 * scanelf -s %ogd% <ELF>
1158 */
1159 static void
1160 scanelf_match_symname(elfobj *elf, char *found_sym, char **ret, size_t *ret_len, const char *symname,
1161 unsigned int stt, unsigned int stb, unsigned int shn, unsigned long size)
1162 {
1163 char *this_sym, *next_sym, saved = saved;
1164
1165 /* allow the user to specify a comma delimited list of symbols to search for */
1166 next_sym = NULL;
1167 do {
1168 bool inc_notype, inc_object, inc_func, inc_file,
1169 inc_local, inc_global, inc_weak,
1170 inc_def, inc_undef, inc_abs, inc_common;
1171
1172 if (next_sym) {
1173 next_sym[-1] = saved;
1174 this_sym = next_sym;
1175 } else
1176 this_sym = find_sym;
1177 if ((next_sym = strchr(this_sym, ','))) {
1178 /* make parsing easier by killing the comma temporarily */
1179 saved = *next_sym;
1180 *next_sym = '\0';
1181 next_sym += 1;
1182 }
1183
1184 /* symbol selection! */
1185 inc_notype = inc_object = inc_func = inc_file = \
1186 inc_local = inc_global = inc_weak = \
1187 inc_def = inc_undef = inc_abs = inc_common = \
1188 (*this_sym != '%');
1189
1190 /* parse the contents of %...% */
1191 if (!inc_notype) {
1192 while (*(this_sym++)) {
1193 if (*this_sym == '%') {
1194 ++this_sym;
1195 break;
1196 }
1197 switch (*this_sym) {
1198 case 'n': inc_notype = true; break;
1199 case 'o': inc_object = true; break;
1200 case 'f': inc_func = true; break;
1201 case 'F': inc_file = true; break;
1202 case 'l': inc_local = true; break;
1203 case 'g': inc_global = true; break;
1204 case 'w': inc_weak = true; break;
1205 case 'd': inc_def = true; break;
1206 case 'u': inc_undef = true; break;
1207 case 'a': inc_abs = true; break;
1208 case 'c': inc_common = true; break;
1209 default: err("invalid symbol selector '%c'", *this_sym);
1210 }
1211 }
1212
1213 /* If no types are matched, not match all */
1214 if (!inc_notype && !inc_object && !inc_func && !inc_file)
1215 inc_notype = inc_object = inc_func = inc_file = true;
1216 if (!inc_local && !inc_global && !inc_weak)
1217 inc_local = inc_global = inc_weak = true;
1218 if (!inc_def && !inc_undef && !inc_abs && !inc_common)
1219 inc_def = inc_undef = inc_abs = inc_common = true;
1220
1221 /* backwards compat for defined/undefined short hand */
1222 } else if (*this_sym == '+') {
1223 inc_undef = false;
1224 ++this_sym;
1225 } else if (*this_sym == '-') {
1226 inc_def = inc_abs = inc_common = false;
1227 ++this_sym;
1228 }
1229
1230 /* filter symbols */
1231 if ((!inc_notype && stt == STT_NOTYPE) || \
1232 (!inc_object && stt == STT_OBJECT) || \
1233 (!inc_func && stt == STT_FUNC ) || \
1234 (!inc_file && stt == STT_FILE ) || \
1235 (!inc_local && stb == STB_LOCAL ) || \
1236 (!inc_global && stb == STB_GLOBAL) || \
1237 (!inc_weak && stb == STB_WEAK ) || \
1238 (!inc_def && shn && shn < SHN_LORESERVE) || \
1239 (!inc_undef && shn == SHN_UNDEF ) || \
1240 (!inc_abs && shn == SHN_ABS ) || \
1241 (!inc_common && shn == SHN_COMMON))
1242 continue;
1243
1244 if (*this_sym == '*') {
1245 /* a "*" symbol gets you debug output */
1246 printf("%s(%s) %5lX %15s %15s %15s %s\n",
1247 ((*found_sym == 0) ? "\n\t" : "\t"),
1248 elf->base_filename,
1249 size,
1250 get_elfstttype(stt),
1251 get_elfstbtype(stb),
1252 get_elfshntype(shn),
1253 symname);
1254 goto matched;
1255
1256 } else {
1257 if (g_match) {
1258 /* regex match the symbol */
1259 if (rematch(this_sym, symname, REG_EXTENDED) != 0)
1260 continue;
1261
1262 } else if (*this_sym) {
1263 /* give empty symbols a "pass", else do a normal compare */
1264 const size_t len = strlen(this_sym);
1265 if (!(strncmp(this_sym, symname, len) == 0 &&
1266 /* Accept unversioned symbol names */
1267 (symname[len] == '\0' || symname[len] == '@')))
1268 continue;
1269 }
1270
1271 if (be_semi_verbose) {
1272 char buf[1024];
1273 snprintf(buf, sizeof(buf), "%lX %s %s",
1274 size,
1275 get_elfstttype(stt),
1276 this_sym);
1277 *ret = xstrdup(buf);
1278 } else {
1279 if (*ret) xchrcat(ret, ',', ret_len);
1280 xstrcat(ret, symname, ret_len);
1281 }
1282
1283 goto matched;
1284 }
1285 } while (next_sym);
1286
1287 return;
1288
1289 matched:
1290 *found_sym = 1;
1291 if (next_sym)
1292 next_sym[-1] = saved;
1293 }
1294
1295 static const char *scanelf_file_sym(elfobj *elf, char *found_sym)
1296 {
1297 char *ret;
1298 void *symtab_void, *strtab_void;
1299
1300 if (!find_sym) return NULL;
1301 ret = NULL;
1302
1303 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
1304
1305 if (symtab_void && strtab_void) {
1306 #define FIND_SYM(B) \
1307 if (elf->elf_class == ELFCLASS ## B) { \
1308 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
1309 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
1310 Elf ## B ## _Sym *sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
1311 Elf ## B ## _Word i, cnt = EGET(symtab->sh_entsize); \
1312 char *symname; \
1313 size_t ret_len = 0; \
1314 if (cnt) \
1315 cnt = EGET(symtab->sh_size) / cnt; \
1316 for (i = 0; i < cnt; ++i) { \
1317 if ((void*)sym > elf->data_end) { \
1318 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1319 goto break_out; \
1320 } \
1321 if (sym->st_name) { \
1322 /* make sure the symbol name is in acceptable memory range */ \
1323 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
1324 if ((void*)symname > elf->data_end) { \
1325 warnf("%s: corrupt ELF symbols", elf->filename); \
1326 ++sym; \
1327 continue; \
1328 } \
1329 scanelf_match_symname(elf, found_sym, \
1330 &ret, &ret_len, symname, \
1331 ELF##B##_ST_TYPE(EGET(sym->st_info)), \
1332 ELF##B##_ST_BIND(EGET(sym->st_info)), \
1333 EGET(sym->st_shndx), \
1334 /* st_size can be 64bit, but no one is really that big, so screw em */ \
1335 EGET(sym->st_size)); \
1336 } \
1337 ++sym; \
1338 } \
1339 }
1340 FIND_SYM(32)
1341 FIND_SYM(64)
1342 }
1343
1344 break_out:
1345 if (be_wewy_wewy_quiet) return NULL;
1346
1347 if (*find_sym != '*' && *found_sym)
1348 return ret;
1349 if (be_quiet)
1350 return NULL;
1351 else
1352 return " - ";
1353 }
1354
1355 static const char *scanelf_file_sections(elfobj *elf, char *found_section)
1356 {
1357 if (!find_section)
1358 return NULL;
1359
1360 #define FIND_SECTION(B) \
1361 if (elf->elf_class == ELFCLASS ## B) { \
1362 size_t matched, n; \
1363 int invert; \
1364 const char *section_name; \
1365 Elf ## B ## _Shdr *section; \
1366 \
1367 matched = 0; \
1368 array_for_each(find_section_arr, n, section_name) { \
1369 invert = (*section_name == '!' ? 1 : 0); \
1370 section = SHDR ## B (elf_findsecbyname(elf, section_name + invert)); \
1371 if ((section == NULL && invert) || (section != NULL && !invert)) \
1372 ++matched; \
1373 } \
1374 \
1375 if (matched == array_cnt(find_section_arr)) \
1376 *found_section = 1; \
1377 }
1378 FIND_SECTION(32)
1379 FIND_SECTION(64)
1380
1381 if (be_wewy_wewy_quiet)
1382 return NULL;
1383
1384 if (*found_section)
1385 return find_section;
1386
1387 if (be_quiet)
1388 return NULL;
1389 else
1390 return " - ";
1391 }
1392
1393 /* scan an elf file and show all the fun stuff */
1394 #define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
1395 static int scanelf_elfobj(elfobj *elf)
1396 {
1397 unsigned long i;
1398 char found_pax, found_phdr, found_relro, found_load, found_textrel,
1399 found_rpath, found_needed, found_interp, found_bind, found_soname,
1400 found_sym, found_lib, found_file, found_textrels, found_section;
1401 static char *out_buffer = NULL;
1402 static size_t out_len;
1403
1404 found_pax = found_phdr = found_relro = found_load = found_textrel = \
1405 found_rpath = found_needed = found_interp = found_bind = found_soname = \
1406 found_sym = found_lib = found_file = found_textrels = found_section = 0;
1407
1408 if (be_verbose > 2)
1409 printf("%s: scanning file {%s,%s}\n", elf->filename,
1410 get_elfeitype(EI_CLASS, elf->elf_class),
1411 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
1412 else if (be_verbose > 1)
1413 printf("%s: scanning file\n", elf->filename);
1414
1415 /* init output buffer */
1416 if (!out_buffer) {
1417 out_len = sizeof(char) * 80;
1418 out_buffer = xmalloc(out_len);
1419 }
1420 *out_buffer = '\0';
1421
1422 /* show the header */
1423 if (!be_quiet && show_banner) {
1424 for (i = 0; out_format[i]; ++i) {
1425 if (!IS_MODIFIER(out_format[i])) continue;
1426
1427 switch (out_format[++i]) {
1428 case '+': break;
1429 case '%': break;
1430 case '#': break;
1431 case 'F':
1432 case 'p':
1433 case 'f': prints("FILE "); found_file = 1; break;
1434 case 'o': prints(" TYPE "); break;
1435 case 'x': prints(" PAX "); break;
1436 case 'e': prints("STK/REL/PTL "); break;
1437 case 't': prints("TEXTREL "); break;
1438 case 'r': prints("RPATH "); break;
1439 case 'M': prints("CLASS "); break;
1440 case 'l':
1441 case 'n': prints("NEEDED "); break;
1442 case 'i': prints("INTERP "); break;
1443 case 'b': prints("BIND "); break;
1444 case 'Z': prints("SIZE "); break;
1445 case 'S': prints("SONAME "); break;
1446 case 's': prints("SYM "); break;
1447 case 'N': prints("LIB "); break;
1448 case 'T': prints("TEXTRELS "); break;
1449 case 'k': prints("SECTION "); break;
1450 case 'a': prints("ARCH "); break;
1451 case 'I': prints("OSABI "); break;
1452 case 'Y': prints("EABI "); break;
1453 case 'O': prints("PERM "); break;
1454 case 'D': prints("ENDIAN "); break;
1455 default: warnf("'%c' has no title ?", out_format[i]);
1456 }
1457 }
1458 if (!found_file) prints("FILE ");
1459 prints("\n");
1460 found_file = 0;
1461 show_banner = 0;
1462 }
1463
1464 /* dump all the good stuff */
1465 for (i = 0; out_format[i]; ++i) {
1466 const char *out;
1467 const char *tmp;
1468 static char ubuf[sizeof(unsigned long)*2];
1469 if (!IS_MODIFIER(out_format[i])) {
1470 xchrcat(&out_buffer, out_format[i], &out_len);
1471 continue;
1472 }
1473
1474 out = NULL;
1475 be_wewy_wewy_quiet = (out_format[i] == '#');
1476 be_semi_verbose = (out_format[i] == '+');
1477 switch (out_format[++i]) {
1478 case '+':
1479 case '%':
1480 case '#':
1481 xchrcat(&out_buffer, out_format[i], &out_len); break;
1482 case 'F':
1483 found_file = 1;
1484 if (be_wewy_wewy_quiet) break;
1485 xstrcat(&out_buffer, elf->filename, &out_len);
1486 break;
1487 case 'p':
1488 found_file = 1;
1489 if (be_wewy_wewy_quiet) break;
1490 tmp = elf->filename;
1491 if (search_path) {
1492 ssize_t len_search = strlen(search_path);
1493 ssize_t len_file = strlen(elf->filename);
1494 if (!strncmp(elf->filename, search_path, len_search) && \
1495 len_file > len_search)
1496 tmp += len_search;
1497 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1498 }
1499 xstrcat(&out_buffer, tmp, &out_len);
1500 break;
1501 case 'f':
1502 found_file = 1;
1503 if (be_wewy_wewy_quiet) break;
1504 tmp = strrchr(elf->filename, '/');
1505 tmp = (tmp == NULL ? elf->filename : tmp+1);
1506 xstrcat(&out_buffer, tmp, &out_len);
1507 break;
1508 case 'o': out = get_elfetype(elf); break;
1509 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
1510 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
1511 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1512 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
1513 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1514 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1515 case 'D': out = get_endian(elf); break;
1516 case 'O': out = strfileperms(elf->filename); break;
1517 case 'n':
1518 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
1519 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1520 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1521 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
1522 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1523 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1524 case 'a': out = get_elfemtype(elf); break;
1525 case 'I': out = get_elfosabi(elf); break;
1526 case 'Y': out = get_elf_eabi(elf); break;
1527 case 'Z': snprintf(ubuf, sizeof(ubuf), "%lu", (unsigned long)elf->len); out = ubuf; break;;
1528 default: warnf("'%c' has no scan code?", out_format[i]);
1529 }
1530 if (out)
1531 xstrcat(&out_buffer, out, &out_len);
1532 }
1533
1534 #define FOUND_SOMETHING() \
1535 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1536 found_rpath || found_needed || found_interp || found_bind || \
1537 found_soname || found_sym || found_lib || found_textrels || found_section )
1538
1539 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1540 xchrcat(&out_buffer, ' ', &out_len);
1541 xstrcat(&out_buffer, elf->filename, &out_len);
1542 }
1543 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
1544 puts(out_buffer);
1545 fflush(stdout);
1546 }
1547
1548 return 0;
1549 }
1550
1551 /* scan a single elf */
1552 static int scanelf_elf(const char *filename, int fd, size_t len)
1553 {
1554 int ret = 1;
1555 elfobj *elf;
1556
1557 /* verify this is real ELF */
1558 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1559 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1560 return 2;
1561 }
1562 switch (match_bits) {
1563 case 32:
1564 if (elf->elf_class != ELFCLASS32)
1565 goto label_done;
1566 break;
1567 case 64:
1568 if (elf->elf_class != ELFCLASS64)
1569 goto label_done;
1570 break;
1571 default: break;
1572 }
1573 if (match_etypes) {
1574 char sbuf[126];
1575 strncpy(sbuf, match_etypes, sizeof(sbuf));
1576 if (strchr(match_etypes, ',') != NULL) {
1577 char *p;
1578 while ((p = strrchr(sbuf, ',')) != NULL) {
1579 *p = 0;
1580 if (etype_lookup(p+1) == get_etype(elf))
1581 goto label_ret;
1582 }
1583 }
1584 if (etype_lookup(sbuf) != get_etype(elf))
1585 goto label_done;
1586 }
1587
1588 label_ret:
1589 ret = scanelf_elfobj(elf);
1590
1591 label_done:
1592 unreadelf(elf);
1593 return ret;
1594 }
1595
1596 /* scan an archive of elfs */
1597 static int scanelf_archive(const char *filename, int fd, size_t len)
1598 {
1599 archive_handle *ar;
1600 archive_member *m;
1601 char *ar_buffer;
1602 elfobj *elf;
1603
1604 ar = ar_open_fd(filename, fd);
1605 if (ar == NULL)
1606 return 1;
1607
1608 ar_buffer = mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1609 while ((m = ar_next(ar)) != NULL) {
1610 off_t cur_pos = lseek(fd, 0, SEEK_CUR);
1611 if (cur_pos == -1)
1612 errp("lseek() failed");
1613 elf = readelf_buffer(m->name, ar_buffer + cur_pos, m->size);
1614 if (elf) {
1615 scanelf_elfobj(elf);
1616 unreadelf(elf);
1617 }
1618 }
1619 munmap(ar_buffer, len);
1620
1621 return 0;
1622 }
1623 /* scan a file which may be an elf or an archive or some other magical beast */
1624 static int scanelf_fileat(int dir_fd, const char *filename, const struct stat *st_cache)
1625 {
1626 const struct stat *st = st_cache;
1627 struct stat symlink_st;
1628 int fd;
1629
1630 /* always handle regular files and handle symlinked files if no -y */
1631 if (S_ISLNK(st->st_mode)) {
1632 if (!scan_symlink)
1633 return 1;
1634 fstatat(dir_fd, filename, &symlink_st, 0);
1635 st = &symlink_st;
1636 }
1637
1638 if (!S_ISREG(st->st_mode)) {
1639 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1640 return 1;
1641 }
1642
1643 if (match_perms) {
1644 if ((st->st_mode | match_perms) != st->st_mode)
1645 return 1;
1646 }
1647 fd = openat(dir_fd, filename, (fix_elf ? O_RDWR : O_RDONLY) | O_CLOEXEC);
1648 if (fd == -1)
1649 return 1;
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 matching rather than string compare (use with -s)",
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 if (find_sym) warn("You prob don't want to specify -s twice");
2115 find_sym = optarg;
2116 break;
2117 }
2118 case 'N':
2119 xarraypush_str(find_lib_arr, optarg);
2120 break;
2121 case 'F': {
2122 if (out_format) warn("You prob don't want to specify -F twice");
2123 out_format = optarg;
2124 break;
2125 }
2126 case 'z': {
2127 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
2128 size_t x;
2129
2130 for (x = 0; x < strlen(optarg); x++) {
2131 switch (optarg[x]) {
2132 case 'p':
2133 case 'P':
2134 do_pax_state(optarg[x], PAGEEXEC);
2135 break;
2136 case 's':
2137 case 'S':
2138 do_pax_state(optarg[x], SEGMEXEC);
2139 break;
2140 case 'm':
2141 case 'M':
2142 do_pax_state(optarg[x], MPROTECT);
2143 break;
2144 case 'e':
2145 case 'E':
2146 do_pax_state(optarg[x], EMUTRAMP);
2147 break;
2148 case 'r':
2149 case 'R':
2150 do_pax_state(optarg[x], RANDMMAP);
2151 break;
2152 case 'x':
2153 case 'X':
2154 do_pax_state(optarg[x], RANDEXEC);
2155 break;
2156 default:
2157 break;
2158 }
2159 }
2160 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
2161 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
2162 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
2163 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
2164 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
2165 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
2166 setpax = flags;
2167 break;
2168 }
2169 case 'Z': show_size = 1; break;
2170 case 'g': g_match = 1; break;
2171 case 'L': load_cache_config = use_ldcache = 1; break;
2172 case 'y': scan_symlink = 0; break;
2173 case 'A': scan_archives = 1; break;
2174 case 'C': color_init(true); break;
2175 case 'B': show_banner = 0; break;
2176 case 'l': load_cache_config = scan_ldpath = 1; break;
2177 case 'p': scan_envpath = 1; break;
2178 case 'R': dir_recurse = 1; break;
2179 case 'm': dir_crossmount = 0; break;
2180 case 'X': ++fix_elf; break;
2181 case 'x': show_pax = 1; break;
2182 case 'e': show_phdr = 1; break;
2183 case 't': show_textrel = 1; break;
2184 case 'r': show_rpath = 1; break;
2185 case 'n': show_needed = 1; break;
2186 case 'i': show_interp = 1; break;
2187 case 'b': show_bind = 1; break;
2188 case 'S': show_soname = 1; break;
2189 case 'T': show_textrels = 1; break;
2190 case 'q': be_quiet = 1; break;
2191 case 'v': be_verbose = (be_verbose % 20) + 1; break;
2192 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
2193 case 'D': show_endian = 1; break;
2194 case 'I': show_osabi = 1; break;
2195 case 'Y': show_eabi = 1; break;
2196 case 128:
2197 root_fd = open(optarg, O_RDONLY|O_CLOEXEC);
2198 if (root_fd == -1)
2199 err("Could not open root: %s", optarg);
2200 break;
2201 case 129: load_cache_config = use_ldpath = 1; break;
2202 case ':':
2203 err("Option '%c' is missing parameter", optopt);
2204 case '?':
2205 err("Unknown option '%c' or argument missing", optopt);
2206 default:
2207 err("Unhandled option '%c'; please report this", i);
2208 }
2209 }
2210 if (show_textrels && be_verbose)
2211 has_objdump = bin_in_path("objdump");
2212 /* flatten arrays for display */
2213 if (array_cnt(find_lib_arr))
2214 find_lib = array_flatten_str(find_lib_arr);
2215 if (array_cnt(find_section_arr))
2216 find_section = array_flatten_str(find_section_arr);
2217 /* let the format option override all other options */
2218 if (out_format) {
2219 show_pax = show_phdr = show_textrel = show_rpath = \
2220 show_needed = show_interp = show_bind = show_soname = \
2221 show_textrels = show_perms = show_endian = show_size = \
2222 show_osabi = show_eabi = 0;
2223 for (i = 0; out_format[i]; ++i) {
2224 if (!IS_MODIFIER(out_format[i])) continue;
2225
2226 switch (out_format[++i]) {
2227 case '+': break;
2228 case '%': break;
2229 case '#': break;
2230 case 'F': break;
2231 case 'p': break;
2232 case 'f': break;
2233 case 'k': break;
2234 case 's': break;
2235 case 'N': break;
2236 case 'o': break;
2237 case 'a': break;
2238 case 'M': break;
2239 case 'Z': show_size = 1; break;
2240 case 'D': show_endian = 1; break;
2241 case 'I': show_osabi = 1; break;
2242 case 'Y': show_eabi = 1; break;
2243 case 'O': show_perms = 1; break;
2244 case 'x': show_pax = 1; break;
2245 case 'e': show_phdr = 1; break;
2246 case 't': show_textrel = 1; break;
2247 case 'r': show_rpath = 1; break;
2248 case 'n': show_needed = 1; break;
2249 case 'i': show_interp = 1; break;
2250 case 'b': show_bind = 1; break;
2251 case 'S': show_soname = 1; break;
2252 case 'T': show_textrels = 1; break;
2253 default:
2254 err("invalid format specifier '%c' (byte %i)",
2255 out_format[i], i+1);
2256 }
2257 }
2258
2259 /* construct our default format */
2260 } else {
2261 size_t fmt_len = 30;
2262 out_format = xmalloc(sizeof(char) * fmt_len);
2263 *out_format = '\0';
2264 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
2265 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
2266 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
2267 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
2268 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
2269 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
2270 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
2271 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
2272 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
2273 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
2274 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
2275 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
2276 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
2277 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
2278 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
2279 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
2280 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
2281 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
2282 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
2283 }
2284 if (be_verbose > 2) printf("Format: %s\n", out_format);
2285
2286 /* now lets actually do the scanning */
2287 if (load_cache_config)
2288 load_ld_cache_config(__PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
2289 if (scan_ldpath) scanelf_ldpath();
2290 if (scan_envpath) scanelf_envpath();
2291 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
2292 from_file = "-";
2293 if (from_file) {
2294 scanelf_from_file(from_file);
2295 from_file = *argv;
2296 }
2297 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
2298 err("Nothing to scan !?");
2299 while (optind < argc) {
2300 search_path = argv[optind++];
2301 ret = scanelf_dir(search_path);
2302 }
2303
2304 /* clean up */
2305 xarrayfree(ldpaths);
2306 xarrayfree(find_lib_arr);
2307 xarrayfree(find_section_arr);
2308 free(find_lib);
2309 free(find_section);
2310
2311 if (ldcache != 0)
2312 munmap(ldcache, ldcache_size);
2313 return ret;
2314 }
2315
2316 static char **get_split_env(const char *envvar)
2317 {
2318 const char *delims = " \t\n";
2319 char **envvals = NULL;
2320 char *env, *s;
2321 int nentry;
2322
2323 if ((env = getenv(envvar)) == NULL)
2324 return NULL;
2325
2326 env = xstrdup(env);
2327 if (env == NULL)
2328 return NULL;
2329
2330 s = strtok(env, delims);
2331 if (s == NULL) {
2332 free(env);
2333 return NULL;
2334 }
2335
2336 nentry = 0;
2337 while (s != NULL) {
2338 ++nentry;
2339 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
2340 envvals[nentry-1] = s;
2341 s = strtok(NULL, delims);
2342 }
2343 envvals[nentry] = NULL;
2344
2345 /* don't want to free(env) as it contains the memory that backs
2346 * the envvals array of strings */
2347 return envvals;
2348 }
2349
2350 static void parseenv(void)
2351 {
2352 color_init(false);
2353 qa_textrels = get_split_env("QA_TEXTRELS");
2354 qa_execstack = get_split_env("QA_EXECSTACK");
2355 qa_wx_load = get_split_env("QA_WX_LOAD");
2356 }
2357
2358 #ifdef __PAX_UTILS_CLEANUP
2359 static void cleanup(void)
2360 {
2361 free(out_format);
2362 free(qa_textrels);
2363 free(qa_execstack);
2364 free(qa_wx_load);
2365 }
2366 #endif
2367
2368 int main(int argc, char *argv[])
2369 {
2370 int ret;
2371 if (argc < 2)
2372 usage(EXIT_FAILURE);
2373 parseenv();
2374 ret = parseargs(argc, argv);
2375 fclose(stdout);
2376 #ifdef __PAX_UTILS_CLEANUP
2377 cleanup();
2378 warn("The calls to add/delete heap should be off:\n"
2379 "\t- 1 due to the out_buffer not being freed in scanelf_fileat()\n"
2380 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
2381 #endif
2382 return ret;
2383 }
2384
2385 /* Match filename against entries in matchlist, return TRUE
2386 * if the file is listed */
2387 static int file_matches_list(const char *filename, char **matchlist)
2388 {
2389 char **file;
2390 char *match;
2391 char buf[__PAX_UTILS_PATH_MAX];
2392
2393 if (matchlist == NULL)
2394 return 0;
2395
2396 for (file = matchlist; *file != NULL; file++) {
2397 if (search_path) {
2398 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2399 match = buf;
2400 } else {
2401 match = *file;
2402 }
2403 if (fnmatch(match, filename, 0) == 0)
2404 return 1;
2405 }
2406 return 0;
2407 }

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