/[gentoo-projects]/pax-utils/scanelf.c
Gentoo

Contents of /pax-utils/scanelf.c

Parent Directory Parent Directory | Revision Log Revision Log


Revision 1.231 - (show annotations) (download) (as text)
Tue Sep 27 19:58:09 2011 UTC (2 years, 10 months ago) by vapier
Branch: MAIN
Changes since 1.230: +2 -2 lines
File MIME type: text/x-csrc
simplify rcsid a little

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 1.230 2011/09/27 19:56:15 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 1.230 2011/09/27 19:56:15 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
59 static char **qa_textrels = NULL;
60 static char **qa_execstack = NULL;
61 static char **qa_wx_load = NULL;
62 static char *root;
63
64 static int match_bits = 0;
65 static unsigned int match_perms = 0;
66 static void *ldcache = NULL;
67 static size_t ldcache_size = 0;
68 static unsigned long setpax = 0UL;
69
70 static int has_objdump = 0;
71
72 /* find the path to a file by name */
73 static int bin_in_path(const char *fname)
74 {
75 char fullpath[__PAX_UTILS_PATH_MAX];
76 char *path, *p;
77
78 path = getenv("PATH");
79 if (!path)
80 return 0;
81
82 while ((p = strrchr(path, ':')) != NULL) {
83 snprintf(fullpath, sizeof(fullpath), "%s/%s", p + 1, fname);
84 *p = 0;
85 if (access(fullpath, R_OK) != -1)
86 return 1;
87 }
88
89 return 0;
90 }
91
92 /* 1 on failure. 0 otherwise */
93 static int rematch(const char *regex, const char *match, int cflags)
94 {
95 regex_t preg;
96 int ret;
97
98 if ((match == NULL) || (regex == NULL))
99 return EXIT_FAILURE;
100
101 if ((ret = regcomp(&preg, regex, cflags))) {
102 char err[256];
103
104 if (regerror(ret, &preg, err, sizeof(err)))
105 fprintf(stderr, "regcomp failed: %s", err);
106 else
107 fprintf(stderr, "regcomp failed");
108
109 return EXIT_FAILURE;
110 }
111 ret = regexec(&preg, match, 0, NULL, 0);
112 regfree(&preg);
113
114 return ret;
115 }
116
117 /* sub-funcs for scanelf_file() */
118 static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
119 {
120 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
121
122 /* debug sections */
123 void *symtab = elf_findsecbyname(elf, ".symtab");
124 void *strtab = elf_findsecbyname(elf, ".strtab");
125 /* runtime sections */
126 void *dynsym = elf_findsecbyname(elf, ".dynsym");
127 void *dynstr = elf_findsecbyname(elf, ".dynstr");
128
129 #define GET_SYMTABS(B) \
130 if (elf->elf_class == ELFCLASS ## B) { \
131 if (symtab && dynsym) { \
132 Elf ## B ## _Shdr *esymtab = symtab; \
133 Elf ## B ## _Shdr *edynsym = dynsym; \
134 *sym = (EGET(esymtab->sh_size) > EGET(edynsym->sh_size)) ? symtab : dynsym; \
135 } else \
136 *sym = symtab ? symtab : dynsym; \
137 if (strtab && dynstr) { \
138 Elf ## B ## _Shdr *estrtab = strtab; \
139 Elf ## B ## _Shdr *edynstr = dynstr; \
140 *tab = (EGET(estrtab->sh_size) > EGET(edynstr->sh_size)) ? strtab : dynstr; \
141 } else \
142 *tab = strtab ? strtab : dynstr; \
143 }
144 GET_SYMTABS(32)
145 GET_SYMTABS(64)
146 }
147
148 static char *scanelf_file_pax(elfobj *elf, char *found_pax)
149 {
150 static char ret[7];
151 unsigned long i, shown;
152
153 if (!show_pax) return NULL;
154
155 shown = 0;
156 memset(&ret, 0, sizeof(ret));
157
158 if (elf->phdr) {
159 #define SHOW_PAX(B) \
160 if (elf->elf_class == ELFCLASS ## B) { \
161 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
162 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
163 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
164 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
165 continue; \
166 if (fix_elf && setpax) { \
167 /* set the paxctl flags */ \
168 ESET(phdr[i].p_flags, setpax); \
169 } \
170 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
171 continue; \
172 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
173 *found_pax = 1; \
174 ++shown; \
175 break; \
176 } \
177 }
178 SHOW_PAX(32)
179 SHOW_PAX(64)
180 }
181
182 if (fix_elf && setpax) {
183 /* set the chpax settings */
184 if (elf->elf_class == ELFCLASS32) {
185 if (EHDR32(elf->ehdr)->e_type == ET_DYN || EHDR32(elf->ehdr)->e_type == ET_EXEC)
186 ESET(EHDR32(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
187 } else {
188 if (EHDR64(elf->ehdr)->e_type == ET_DYN || EHDR64(elf->ehdr)->e_type == ET_EXEC)
189 ESET(EHDR64(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
190 }
191 }
192
193 /* fall back to EI_PAX if no PT_PAX was found */
194 if (!*ret) {
195 static char *paxflags;
196 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
197 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
198 *found_pax = 1;
199 return (be_wewy_wewy_quiet ? NULL : paxflags);
200 }
201 strncpy(ret, paxflags, sizeof(ret));
202 }
203
204 if (be_wewy_wewy_quiet || (be_quiet && !shown))
205 return NULL;
206 else
207 return ret;
208 }
209
210 static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
211 {
212 static char ret[12];
213 char *found;
214 unsigned long i, shown, multi_stack, multi_relro, multi_load;
215 int max_pt_load;
216
217 if (!show_phdr) return NULL;
218
219 memcpy(ret, "--- --- ---\0", 12);
220
221 shown = 0;
222 multi_stack = multi_relro = multi_load = 0;
223 max_pt_load = elf_max_pt_load(elf);
224
225 #define NOTE_GNU_STACK ".note.GNU-stack"
226 #define SHOW_PHDR(B) \
227 if (elf->elf_class == ELFCLASS ## B) { \
228 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
229 Elf ## B ## _Off offset; \
230 uint32_t flags, check_flags; \
231 if (elf->phdr != NULL) { \
232 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
233 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
234 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
235 if (multi_stack++) \
236 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
237 if (file_matches_list(elf->filename, qa_execstack)) \
238 continue; \
239 found = found_phdr; \
240 offset = 0; \
241 check_flags = PF_X; \
242 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
243 if (multi_relro++) \
244 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
245 found = found_relro; \
246 offset = 4; \
247 check_flags = PF_X; \
248 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
249 if (EGET(ehdr->e_type) == ET_DYN || EGET(ehdr->e_type) == ET_EXEC) \
250 if (multi_load++ > max_pt_load) \
251 warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
252 if (file_matches_list(elf->filename, qa_wx_load)) \
253 continue; \
254 found = found_load; \
255 offset = 8; \
256 check_flags = PF_W|PF_X; \
257 } else \
258 continue; \
259 flags = EGET(phdr[i].p_flags); \
260 if (be_quiet && ((flags & check_flags) != check_flags)) \
261 continue; \
262 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
263 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
264 ret[3] = ret[7] = '!'; \
265 flags = EGET(phdr[i].p_flags); \
266 } \
267 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
268 *found = 1; \
269 ++shown; \
270 } \
271 } else if (elf->shdr != NULL) { \
272 /* no program headers which means this is prob an object file */ \
273 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
274 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
275 char *str; \
276 if ((void*)strtbl > elf->data_end) \
277 goto skip_this_shdr##B; \
278 check_flags = SHF_WRITE|SHF_EXECINSTR; \
279 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
280 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
281 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
282 str = elf->data + offset; \
283 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
284 if (!strcmp(str, NOTE_GNU_STACK)) { \
285 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
286 flags = EGET(shdr[i].sh_flags); \
287 if (be_quiet && ((flags & check_flags) != check_flags)) \
288 continue; \
289 ++*found_phdr; \
290 shown = 1; \
291 if (flags & SHF_WRITE) ret[0] = 'W'; \
292 if (flags & SHF_ALLOC) ret[1] = 'A'; \
293 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
294 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
295 break; \
296 } \
297 } \
298 skip_this_shdr##B: \
299 if (!multi_stack) { \
300 if (file_matches_list(elf->filename, qa_execstack)) \
301 return NULL; \
302 *found_phdr = 1; \
303 shown = 1; \
304 memcpy(ret, "!WX", 3); \
305 } \
306 } \
307 }
308 SHOW_PHDR(32)
309 SHOW_PHDR(64)
310
311 if (be_wewy_wewy_quiet || (be_quiet && !shown))
312 return NULL;
313 else
314 return ret;
315 }
316
317 /*
318 * See if this ELF contains a DT_TEXTREL tag in any of its
319 * PT_DYNAMIC sections.
320 */
321 static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
322 {
323 static const char *ret = "TEXTREL";
324 unsigned long i;
325
326 if (!show_textrel && !show_textrels) return NULL;
327
328 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
329
330 if (elf->phdr) {
331 #define SHOW_TEXTREL(B) \
332 if (elf->elf_class == ELFCLASS ## B) { \
333 Elf ## B ## _Dyn *dyn; \
334 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
335 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
336 Elf ## B ## _Off offset; \
337 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
338 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
339 offset = EGET(phdr[i].p_offset); \
340 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
341 dyn = DYN ## B (elf->vdata + offset); \
342 while (EGET(dyn->d_tag) != DT_NULL) { \
343 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
344 *found_textrel = 1; \
345 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
346 return (be_wewy_wewy_quiet ? NULL : ret); \
347 } \
348 ++dyn; \
349 } \
350 } }
351 SHOW_TEXTREL(32)
352 SHOW_TEXTREL(64)
353 }
354
355 if (be_quiet || be_wewy_wewy_quiet)
356 return NULL;
357 else
358 return " - ";
359 }
360
361 /*
362 * Scan the .text section to see if there are any relocations in it.
363 * Should rewrite this to check PT_LOAD sections that are marked
364 * Executable rather than the section named '.text'.
365 */
366 static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
367 {
368 unsigned long s, r, rmax;
369 void *symtab_void, *strtab_void, *text_void;
370
371 if (!show_textrels) return NULL;
372
373 /* don't search for TEXTREL's if the ELF doesn't have any */
374 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
375 if (!*found_textrel) return NULL;
376
377 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
378 text_void = elf_findsecbyname(elf, ".text");
379
380 if (symtab_void && strtab_void && text_void && elf->shdr) {
381 #define SHOW_TEXTRELS(B) \
382 if (elf->elf_class == ELFCLASS ## B) { \
383 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
384 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
385 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
386 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
387 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
388 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
389 uint ## B ## _t memsz = EGET(text->sh_size); \
390 Elf ## B ## _Rel *rel; \
391 Elf ## B ## _Rela *rela; \
392 /* search the section headers for relocations */ \
393 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
394 uint32_t sh_type = EGET(shdr[s].sh_type); \
395 if (sh_type == SHT_REL) { \
396 rel = REL ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
397 rela = NULL; \
398 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
399 } else if (sh_type == SHT_RELA) { \
400 rel = NULL; \
401 rela = RELA ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
402 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
403 } else \
404 continue; \
405 /* now see if any of the relocs are in the .text */ \
406 for (r = 0; r < rmax; ++r) { \
407 unsigned long sym_max; \
408 Elf ## B ## _Addr offset_tmp; \
409 Elf ## B ## _Sym *func; \
410 Elf ## B ## _Sym *sym; \
411 Elf ## B ## _Addr r_offset; \
412 uint ## B ## _t r_info; \
413 if (sh_type == SHT_REL) { \
414 r_offset = EGET(rel[r].r_offset); \
415 r_info = EGET(rel[r].r_info); \
416 } else { \
417 r_offset = EGET(rela[r].r_offset); \
418 r_info = EGET(rela[r].r_info); \
419 } \
420 /* make sure this relocation is inside of the .text */ \
421 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
422 if (be_verbose <= 2) continue; \
423 } else \
424 *found_textrels = 1; \
425 /* locate this relocation symbol name */ \
426 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
427 if ((void*)sym > elf->data_end) { \
428 warn("%s: corrupt ELF symbol", elf->filename); \
429 continue; \
430 } \
431 sym_max = ELF ## B ## _R_SYM(r_info); \
432 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
433 sym += sym_max; \
434 else \
435 sym = NULL; \
436 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
437 /* show the raw details about this reloc */ \
438 printf(" %s: ", elf->base_filename); \
439 if (sym && sym->st_name) \
440 printf("%s", elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
441 else \
442 printf("(memory/data?)"); \
443 printf(" [0x%lX]", (unsigned long)r_offset); \
444 /* now try to find the closest symbol that this rel is probably in */ \
445 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
446 func = NULL; \
447 offset_tmp = 0; \
448 while (sym_max--) { \
449 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
450 func = sym; \
451 offset_tmp = EGET(sym->st_value); \
452 } \
453 ++sym; \
454 } \
455 printf(" in "); \
456 if (func && func->st_name) { \
457 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
458 if (r_offset > EGET(func->st_size)) \
459 printf("(optimized out: previous %s)", func_name); \
460 else \
461 printf("%s", func_name); \
462 } else \
463 printf("(optimized out)"); \
464 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
465 if (be_verbose && has_objdump) { \
466 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
467 char *sysbuf; \
468 size_t syslen; \
469 int sysret; \
470 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"; \
471 syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
472 sysbuf = xmalloc(syslen); \
473 if (end_addr < r_offset) \
474 /* not uncommon when things are optimized out */ \
475 end_addr = r_offset + 0x100; \
476 snprintf(sysbuf, syslen, sysfmt, \
477 (unsigned long)offset_tmp, \
478 (unsigned long)end_addr, \
479 elf->filename, \
480 (unsigned long)r_offset); \
481 fflush(stdout); \
482 sysret = system(sysbuf); \
483 fflush(stdout); \
484 free(sysbuf); \
485 } \
486 } \
487 } }
488 SHOW_TEXTRELS(32)
489 SHOW_TEXTRELS(64)
490 }
491 if (!*found_textrels)
492 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
493
494 return NULL;
495 }
496
497 static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
498 {
499 struct stat st;
500 switch (*item) {
501 case '/': break;
502 case '.':
503 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
504 break;
505 case ':':
506 case '\0':
507 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
508 break;
509 case '$':
510 if (fstat(elf->fd, &st) != -1)
511 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
512 warnf("Security problem with %s='%s' in %s with mode set of %o",
513 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
514 break;
515 default:
516 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
517 break;
518 }
519 }
520 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
521 {
522 unsigned long i;
523 char *rpath, *runpath, **r;
524 void *strtbl_void;
525
526 if (!show_rpath) return;
527
528 strtbl_void = elf_findsecbyname(elf, ".dynstr");
529 rpath = runpath = NULL;
530
531 if (elf->phdr && strtbl_void) {
532 #define SHOW_RPATH(B) \
533 if (elf->elf_class == ELFCLASS ## B) { \
534 Elf ## B ## _Dyn *dyn; \
535 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
536 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
537 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
538 Elf ## B ## _Off offset; \
539 Elf ## B ## _Xword word; \
540 /* Scan all the program headers */ \
541 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
542 /* Just scan dynamic headers */ \
543 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
544 offset = EGET(phdr[i].p_offset); \
545 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
546 /* Just scan dynamic RPATH/RUNPATH headers */ \
547 dyn = DYN ## B (elf->vdata + offset); \
548 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
549 if (word == DT_RPATH) { \
550 r = &rpath; \
551 } else if (word == DT_RUNPATH) { \
552 r = &runpath; \
553 } else { \
554 ++dyn; \
555 continue; \
556 } \
557 /* Verify the memory is somewhat sane */ \
558 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
559 if (offset < (Elf ## B ## _Off)elf->len) { \
560 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
561 *r = elf->data + offset; \
562 /* cache the length in case we need to nuke this section later on */ \
563 if (fix_elf) \
564 offset = strlen(*r); \
565 /* If quiet, don't output paths in ld.so.conf */ \
566 if (be_quiet) { \
567 size_t len; \
568 char *start, *end; \
569 /* note that we only 'chop' off leading known paths. */ \
570 /* since *r is read-only memory, we can only move the ptr forward. */ \
571 start = *r; \
572 /* scan each path in : delimited list */ \
573 while (start) { \
574 rpath_security_checks(elf, start, get_elfdtype(word)); \
575 end = strchr(start, ':'); \
576 len = (end ? abs(end - start) : strlen(start)); \
577 if (use_ldcache) { \
578 size_t n; \
579 const char *ldpath; \
580 array_for_each(ldpaths, n, ldpath) \
581 if (!strncmp(ldpath, start, len) && !ldpath[len]) { \
582 *r = end; \
583 /* corner case ... if RPATH reads "/usr/lib:", we want \
584 * to show ':' rather than '' */ \
585 if (end && end[1] != '\0') \
586 (*r)++; \
587 break; \
588 } \
589 } \
590 if (!*r || !end) \
591 break; \
592 else \
593 start = start + len + 1; \
594 } \
595 } \
596 if (*r) { \
597 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
598 /* just nuke it */ \
599 nuke_it##B: \
600 memset(*r, 0x00, offset); \
601 *r = NULL; \
602 ESET(dyn->d_tag, DT_DEBUG); \
603 ESET(dyn->d_un.d_ptr, 0); \
604 } else if (fix_elf) { \
605 /* try to clean "bad" paths */ \
606 size_t len, tmpdir_len; \
607 char *start, *end; \
608 const char *tmpdir; \
609 start = *r; \
610 tmpdir = (getenv("TMPDIR") ? : "."); \
611 tmpdir_len = strlen(tmpdir); \
612 while (1) { \
613 end = strchr(start, ':'); \
614 if (start == end) { \
615 eat_this_path##B: \
616 len = strlen(end); \
617 memmove(start, end+1, len); \
618 start[len-1] = '\0'; \
619 end = start - 1; \
620 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
621 if (!end) { \
622 if (start == *r) \
623 goto nuke_it##B; \
624 *--start = '\0'; \
625 } else \
626 goto eat_this_path##B; \
627 } \
628 if (!end) \
629 break; \
630 start = end + 1; \
631 } \
632 if (**r == '\0') \
633 goto nuke_it##B; \
634 } \
635 if (*r) \
636 *found_rpath = 1; \
637 } \
638 } \
639 ++dyn; \
640 } \
641 } }
642 SHOW_RPATH(32)
643 SHOW_RPATH(64)
644 }
645
646 if (be_wewy_wewy_quiet) return;
647
648 if (rpath && runpath) {
649 if (!strcmp(rpath, runpath)) {
650 xstrcat(ret, runpath, ret_len);
651 } else {
652 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
653 xchrcat(ret, '{', ret_len);
654 xstrcat(ret, rpath, ret_len);
655 xchrcat(ret, ',', ret_len);
656 xstrcat(ret, runpath, ret_len);
657 xchrcat(ret, '}', ret_len);
658 }
659 } else if (rpath || runpath)
660 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
661 else if (!be_quiet)
662 xstrcat(ret, " - ", ret_len);
663 }
664
665 #define LDSO_CACHE_MAGIC "ld.so-"
666 #define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
667 #define LDSO_CACHE_VER "1.7.0"
668 #define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
669 #define FLAG_ANY -1
670 #define FLAG_TYPE_MASK 0x00ff
671 #define FLAG_LIBC4 0x0000
672 #define FLAG_ELF 0x0001
673 #define FLAG_ELF_LIBC5 0x0002
674 #define FLAG_ELF_LIBC6 0x0003
675 #define FLAG_REQUIRED_MASK 0xff00
676 #define FLAG_SPARC_LIB64 0x0100
677 #define FLAG_IA64_LIB64 0x0200
678 #define FLAG_X8664_LIB64 0x0300
679 #define FLAG_S390_LIB64 0x0400
680 #define FLAG_POWERPC_LIB64 0x0500
681 #define FLAG_MIPS64_LIBN32 0x0600
682 #define FLAG_MIPS64_LIBN64 0x0700
683
684 #if defined(__GLIBC__) || defined(__UCLIBC__)
685
686 static char *lookup_cache_lib(elfobj *elf, char *fname)
687 {
688 int fd;
689 char *strs;
690 static char buf[__PAX_UTILS_PATH_MAX] = "";
691 const char cachefile[] = "/etc/ld.so.cache";
692 struct stat st;
693
694 typedef struct {
695 char magic[LDSO_CACHE_MAGIC_LEN];
696 char version[LDSO_CACHE_VER_LEN];
697 int nlibs;
698 } header_t;
699 header_t *header;
700
701 typedef struct {
702 int flags;
703 int sooffset;
704 int liboffset;
705 } libentry_t;
706 libentry_t *libent;
707
708 if (fname == NULL)
709 return NULL;
710
711 if (ldcache == NULL) {
712 if (stat(cachefile, &st))
713 return NULL;
714
715 fd = open(cachefile, O_RDONLY);
716 if (fd == -1)
717 return NULL;
718
719 /* cache these values so we only map/unmap the cache file once */
720 ldcache_size = st.st_size;
721 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
722 close(fd);
723
724 if (ldcache == MAP_FAILED) {
725 ldcache = NULL;
726 return NULL;
727 }
728
729 if (memcmp(header->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN) ||
730 memcmp(header->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
731 {
732 munmap(ldcache, ldcache_size);
733 ldcache = NULL;
734 return NULL;
735 }
736 } else
737 header = ldcache;
738
739 libent = ldcache + sizeof(header_t);
740 strs = (char *) &libent[header->nlibs];
741
742 for (fd = 0; fd < header->nlibs; ++fd) {
743 /* This should be more fine grained, but for now we assume that
744 * diff arches will not be cached together, and we ignore the
745 * the different multilib mips cases.
746 */
747 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
748 continue;
749 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
750 continue;
751
752 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
753 continue;
754
755 /* Return first hit because that is how the ldso rolls */
756 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
757 break;
758 }
759
760 return buf;
761 }
762
763 #elif defined(__NetBSD__)
764 static char *lookup_cache_lib(elfobj *elf, char *fname)
765 {
766 static char buf[__PAX_UTILS_PATH_MAX] = "";
767 static struct stat st;
768 size_t n;
769 char *ldpath;
770
771 array_for_each(ldpath, n, ldpath) {
772 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", ldpath, fname) >= sizeof(buf))
773 continue; /* if the pathname is too long, or something went wrong, ignore */
774
775 if (stat(buf, &st) != 0)
776 continue; /* if the lib doesn't exist in *ldpath, look further */
777
778 /* NetBSD doesn't actually do sanity checks, it just loads the file
779 * and if that doesn't work, continues looking in other directories.
780 * This cannot easily be safely emulated, unfortunately. For now,
781 * just assume that if it exists, it's a valid library. */
782
783 return buf;
784 }
785
786 /* not found in any path */
787 return NULL;
788 }
789 #else
790 #ifdef __ELF__
791 #warning Cache support not implemented for your target
792 #endif
793 static char *lookup_cache_lib(elfobj *elf, char *fname)
794 {
795 return NULL;
796 }
797 #endif
798
799 static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
800 {
801 unsigned long i;
802 char *needed;
803 void *strtbl_void;
804 char *p;
805
806 /*
807 * -n -> op==0 -> print all
808 * -N -> op==1 -> print requested
809 */
810 if ((op == 0 && !show_needed) || (op == 1 && !find_lib))
811 return NULL;
812
813 strtbl_void = elf_findsecbyname(elf, ".dynstr");
814
815 if (elf->phdr && strtbl_void) {
816 #define SHOW_NEEDED(B) \
817 if (elf->elf_class == ELFCLASS ## B) { \
818 Elf ## B ## _Dyn *dyn; \
819 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
820 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
821 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
822 Elf ## B ## _Off offset; \
823 size_t matched = 0; \
824 /* Walk all the program headers to find the PT_DYNAMIC */ \
825 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
826 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) \
827 continue; \
828 offset = EGET(phdr[i].p_offset); \
829 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
830 continue; \
831 /* Walk all the dynamic tags to find NEEDED entries */ \
832 dyn = DYN ## B (elf->vdata + offset); \
833 while (EGET(dyn->d_tag) != DT_NULL) { \
834 if (EGET(dyn->d_tag) == DT_NEEDED) { \
835 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
836 if (offset >= (Elf ## B ## _Off)elf->len) { \
837 ++dyn; \
838 continue; \
839 } \
840 needed = elf->data + offset; \
841 if (op == 0) { \
842 /* -n -> print all entries */ \
843 if (!be_wewy_wewy_quiet) { \
844 if (*found_needed) xchrcat(ret, ',', ret_len); \
845 if (use_ldcache) \
846 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
847 needed = p; \
848 xstrcat(ret, needed, ret_len); \
849 } \
850 *found_needed = 1; \
851 } else { \
852 /* -N -> print matching entries */ \
853 size_t n; \
854 const char *find_lib_name; \
855 \
856 array_for_each(find_lib_arr, n, find_lib_name) \
857 if (!strcmp(find_lib_name, needed)) \
858 ++matched; \
859 \
860 if (matched == array_cnt(find_lib_arr)) { \
861 *found_lib = 1; \
862 return (be_wewy_wewy_quiet ? NULL : find_lib); \
863 } \
864 } \
865 } \
866 ++dyn; \
867 } \
868 } }
869 SHOW_NEEDED(32)
870 SHOW_NEEDED(64)
871 if (op == 0 && !*found_needed && be_verbose)
872 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
873 }
874
875 return NULL;
876 }
877 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
878 {
879 void *strtbl_void;
880
881 if (!show_interp) return NULL;
882
883 strtbl_void = elf_findsecbyname(elf, ".interp");
884
885 if (strtbl_void) {
886 #define SHOW_INTERP(B) \
887 if (elf->elf_class == ELFCLASS ## B) { \
888 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
889 *found_interp = 1; \
890 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
891 }
892 SHOW_INTERP(32)
893 SHOW_INTERP(64)
894 }
895 return NULL;
896 }
897 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
898 {
899 unsigned long i;
900 struct stat s;
901 char dynamic = 0;
902
903 if (!show_bind) return NULL;
904 if (!elf->phdr) return NULL;
905
906 #define SHOW_BIND(B) \
907 if (elf->elf_class == ELFCLASS ## B) { \
908 Elf ## B ## _Dyn *dyn; \
909 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
910 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
911 Elf ## B ## _Off offset; \
912 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
913 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
914 dynamic = 1; \
915 offset = EGET(phdr[i].p_offset); \
916 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
917 dyn = DYN ## B (elf->vdata + offset); \
918 while (EGET(dyn->d_tag) != DT_NULL) { \
919 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
920 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
921 { \
922 if (be_quiet) return NULL; \
923 *found_bind = 1; \
924 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
925 } \
926 ++dyn; \
927 } \
928 } \
929 }
930 SHOW_BIND(32)
931 SHOW_BIND(64)
932
933 if (be_wewy_wewy_quiet) return NULL;
934
935 /* don't output anything if quiet mode and the ELF is static or not setuid */
936 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
937 return NULL;
938 } else {
939 *found_bind = 1;
940 return (char *)(dynamic ? "LAZY" : "STATIC");
941 }
942 }
943 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
944 {
945 unsigned long i;
946 char *soname;
947 void *strtbl_void;
948
949 if (!show_soname) return NULL;
950
951 strtbl_void = elf_findsecbyname(elf, ".dynstr");
952
953 if (elf->phdr && strtbl_void) {
954 #define SHOW_SONAME(B) \
955 if (elf->elf_class == ELFCLASS ## B) { \
956 Elf ## B ## _Dyn *dyn; \
957 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
958 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
959 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
960 Elf ## B ## _Off offset; \
961 /* only look for soname in shared objects */ \
962 if (EGET(ehdr->e_type) != ET_DYN) \
963 return NULL; \
964 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
965 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
966 offset = EGET(phdr[i].p_offset); \
967 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
968 dyn = DYN ## B (elf->vdata + offset); \
969 while (EGET(dyn->d_tag) != DT_NULL) { \
970 if (EGET(dyn->d_tag) == DT_SONAME) { \
971 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
972 if (offset >= (Elf ## B ## _Off)elf->len) { \
973 ++dyn; \
974 continue; \
975 } \
976 soname = elf->data + offset; \
977 *found_soname = 1; \
978 return (be_wewy_wewy_quiet ? NULL : soname); \
979 } \
980 ++dyn; \
981 } \
982 } }
983 SHOW_SONAME(32)
984 SHOW_SONAME(64)
985 }
986
987 return NULL;
988 }
989
990 /*
991 * We support the symbol form:
992 * [%[modifiers]%][[+-]<symbol name>][,[.....]]
993 * If the symbol name is empty, then all symbols are matched.
994 * If the symbol name is a glob ("*"), then all symbols are dumped (debug).
995 * Do not rely on this output format at all.
996 * Otherwise the symbol name is used to search (either regex or string compare).
997 * If the first char of the symbol name is a plus ("+"), then only match
998 * defined symbols. If it's a minus ("-"), only match undefined symbols.
999 * Putting modifiers in between the percent signs allows for more in depth
1000 * filters. There are groups of modifiers. If you don't specify a member
1001 * of a group, then all types in that group are matched. The current
1002 * groups and their types are:
1003 * STT group: STT_NOTYPE:n STT_OBJECT:o STT_FUNC:f SST_FILE:F
1004 * STB group: STB_LOCAL:l STB_GLOBAL:g STB_WEAK:w
1005 * SHN group: SHN_UNDEF:u SHN_ABS:a SHN_COMMON:c {defined}:d
1006 * The "defined" value in the SHN group does not correspond to a SHN_xxx define.
1007 * You can search for multiple symbols at once by seperating with a comma (",").
1008 *
1009 * Some examples:
1010 * ELFs with a weak function "foo":
1011 * scanelf -s %wf%foo <ELFs>
1012 * ELFs that define the symbol "main":
1013 * scanelf -s +main <ELFs>
1014 * scanelf -s %d%main <ELFs>
1015 * ELFs that refer to the undefined symbol "brk":
1016 * scanelf -s -brk <ELFs>
1017 * scanelf -s %u%brk <ELFs>
1018 * All global defined objects in an ELF:
1019 * scanelf -s %ogd% <ELF>
1020 */
1021 static void
1022 scanelf_match_symname(elfobj *elf, char *found_sym, char **ret, size_t *ret_len, const char *symname,
1023 unsigned int stt, unsigned int stb, unsigned int shn, unsigned long size)
1024 {
1025 char *this_sym, *next_sym, saved = saved;
1026
1027 /* allow the user to specify a comma delimited list of symbols to search for */
1028 next_sym = NULL;
1029 do {
1030 bool inc_notype, inc_object, inc_func, inc_file,
1031 inc_local, inc_global, inc_weak,
1032 inc_def, inc_undef, inc_abs, inc_common;
1033
1034 if (next_sym) {
1035 next_sym[-1] = saved;
1036 this_sym = next_sym;
1037 } else
1038 this_sym = find_sym;
1039 if ((next_sym = strchr(this_sym, ','))) {
1040 /* make parsing easier by killing the comma temporarily */
1041 saved = *next_sym;
1042 *next_sym = '\0';
1043 next_sym += 1;
1044 }
1045
1046 /* symbol selection! */
1047 inc_notype = inc_object = inc_func = inc_file = \
1048 inc_local = inc_global = inc_weak = \
1049 inc_def = inc_undef = inc_abs = inc_common = \
1050 (*this_sym != '%');
1051
1052 /* parse the contents of %...% */
1053 if (!inc_notype) {
1054 while (*(this_sym++)) {
1055 if (*this_sym == '%') {
1056 ++this_sym;
1057 break;
1058 }
1059 switch (*this_sym) {
1060 case 'n': inc_notype = true; break;
1061 case 'o': inc_object = true; break;
1062 case 'f': inc_func = true; break;
1063 case 'F': inc_file = true; break;
1064 case 'l': inc_local = true; break;
1065 case 'g': inc_global = true; break;
1066 case 'w': inc_weak = true; break;
1067 case 'd': inc_def = true; break;
1068 case 'u': inc_undef = true; break;
1069 case 'a': inc_abs = true; break;
1070 case 'c': inc_common = true; break;
1071 default: err("invalid symbol selector '%c'", *this_sym);
1072 }
1073 }
1074
1075 /* If no types are matched, not match all */
1076 if (!inc_notype && !inc_object && !inc_func && !inc_file)
1077 inc_notype = inc_object = inc_func = inc_file = true;
1078 if (!inc_local && !inc_global && !inc_weak)
1079 inc_local = inc_global = inc_weak = true;
1080 if (!inc_def && !inc_undef && !inc_abs && !inc_common)
1081 inc_def = inc_undef = inc_abs = inc_common = true;
1082
1083 /* backwards compat for defined/undefined short hand */
1084 } else if (*this_sym == '+') {
1085 inc_undef = false;
1086 ++this_sym;
1087 } else if (*this_sym == '-') {
1088 inc_def = inc_abs = inc_common = false;
1089 ++this_sym;
1090 }
1091
1092 /* filter symbols */
1093 if ((!inc_notype && stt == STT_NOTYPE) || \
1094 (!inc_object && stt == STT_OBJECT) || \
1095 (!inc_func && stt == STT_FUNC ) || \
1096 (!inc_file && stt == STT_FILE ) || \
1097 (!inc_local && stb == STB_LOCAL ) || \
1098 (!inc_global && stb == STB_GLOBAL) || \
1099 (!inc_weak && stb == STB_WEAK ) || \
1100 (!inc_def && shn && shn < SHN_LORESERVE) || \
1101 (!inc_undef && shn == SHN_UNDEF ) || \
1102 (!inc_abs && shn == SHN_ABS ) || \
1103 (!inc_common && shn == SHN_COMMON))
1104 continue;
1105
1106 if (*this_sym == '*') {
1107 /* a "*" symbol gets you debug output */
1108 printf("%s(%s) %5lX %15s %15s %15s %s\n",
1109 ((*found_sym == 0) ? "\n\t" : "\t"),
1110 elf->base_filename,
1111 size,
1112 get_elfstttype(stt),
1113 get_elfstbtype(stb),
1114 get_elfshntype(shn),
1115 symname);
1116 goto matched;
1117
1118 } else {
1119 if (g_match) {
1120 /* regex match the symbol */
1121 if (rematch(this_sym, symname, REG_EXTENDED) != 0)
1122 continue;
1123
1124 } else if (*this_sym) {
1125 /* give empty symbols a "pass", else do a normal compare */
1126 const size_t len = strlen(this_sym);
1127 if (!(strncmp(this_sym, symname, len) == 0 &&
1128 /* Accept unversioned symbol names */
1129 (symname[len] == '\0' || symname[len] == '@')))
1130 continue;
1131 }
1132
1133 if (be_semi_verbose) {
1134 char buf[1024];
1135 snprintf(buf, sizeof(buf), "%lX %s %s",
1136 size,
1137 get_elfstttype(stt),
1138 this_sym);
1139 *ret = xstrdup(buf);
1140 } else {
1141 if (*ret) xchrcat(ret, ',', ret_len);
1142 xstrcat(ret, symname, ret_len);
1143 }
1144
1145 goto matched;
1146 }
1147 } while (next_sym);
1148
1149 return;
1150
1151 matched:
1152 *found_sym = 1;
1153 if (next_sym)
1154 next_sym[-1] = saved;
1155 }
1156
1157 static const char *scanelf_file_sym(elfobj *elf, char *found_sym)
1158 {
1159 unsigned long i;
1160 char *ret;
1161 void *symtab_void, *strtab_void;
1162
1163 if (!find_sym) return NULL;
1164 ret = NULL;
1165
1166 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
1167
1168 if (symtab_void && strtab_void) {
1169 #define FIND_SYM(B) \
1170 if (elf->elf_class == ELFCLASS ## B) { \
1171 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
1172 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
1173 Elf ## B ## _Sym *sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
1174 unsigned long cnt = EGET(symtab->sh_entsize); \
1175 char *symname; \
1176 size_t ret_len = 0; \
1177 if (cnt) \
1178 cnt = EGET(symtab->sh_size) / cnt; \
1179 for (i = 0; i < cnt; ++i) { \
1180 if ((void*)sym > elf->data_end) { \
1181 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1182 goto break_out; \
1183 } \
1184 if (sym->st_name) { \
1185 /* make sure the symbol name is in acceptable memory range */ \
1186 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
1187 if ((void*)symname > elf->data_end) { \
1188 warnf("%s: corrupt ELF symbols", elf->filename); \
1189 ++sym; \
1190 continue; \
1191 } \
1192 scanelf_match_symname(elf, found_sym, \
1193 &ret, &ret_len, symname, \
1194 ELF##B##_ST_TYPE(EGET(sym->st_info)), \
1195 ELF##B##_ST_BIND(EGET(sym->st_info)), \
1196 EGET(sym->st_shndx), \
1197 /* st_size can be 64bit, but no one is really that big, so screw em */ \
1198 EGET(sym->st_size)); \
1199 } \
1200 ++sym; \
1201 } }
1202 FIND_SYM(32)
1203 FIND_SYM(64)
1204 }
1205
1206 break_out:
1207 if (be_wewy_wewy_quiet) return NULL;
1208
1209 if (*find_sym != '*' && *found_sym)
1210 return ret;
1211 if (be_quiet)
1212 return NULL;
1213 else
1214 return " - ";
1215 }
1216
1217 static const char *scanelf_file_sections(elfobj *elf, char *found_section)
1218 {
1219 if (!find_section)
1220 return NULL;
1221
1222 #define FIND_SECTION(B) \
1223 if (elf->elf_class == ELFCLASS ## B) { \
1224 size_t matched, n; \
1225 int invert; \
1226 const char *section_name; \
1227 Elf ## B ## _Shdr *section; \
1228 \
1229 matched = 0; \
1230 array_for_each(find_section_arr, n, section_name) { \
1231 invert = (*section_name == '!' ? 1 : 0); \
1232 section = SHDR ## B (elf_findsecbyname(elf, section_name + invert)); \
1233 if ((section == NULL && invert) || (section != NULL && !invert)) \
1234 ++matched; \
1235 } \
1236 \
1237 if (matched == array_cnt(find_section_arr)) \
1238 *found_section = 1; \
1239 }
1240 FIND_SECTION(32)
1241 FIND_SECTION(64)
1242
1243 if (be_wewy_wewy_quiet)
1244 return NULL;
1245
1246 if (*found_section)
1247 return find_section;
1248
1249 if (be_quiet)
1250 return NULL;
1251 else
1252 return " - ";
1253 }
1254
1255 /* scan an elf file and show all the fun stuff */
1256 #define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
1257 static int scanelf_elfobj(elfobj *elf)
1258 {
1259 unsigned long i;
1260 char found_pax, found_phdr, found_relro, found_load, found_textrel,
1261 found_rpath, found_needed, found_interp, found_bind, found_soname,
1262 found_sym, found_lib, found_file, found_textrels, found_section;
1263 static char *out_buffer = NULL;
1264 static size_t out_len;
1265
1266 found_pax = found_phdr = found_relro = found_load = found_textrel = \
1267 found_rpath = found_needed = found_interp = found_bind = found_soname = \
1268 found_sym = found_lib = found_file = found_textrels = found_section = 0;
1269
1270 if (be_verbose > 2)
1271 printf("%s: scanning file {%s,%s}\n", elf->filename,
1272 get_elfeitype(EI_CLASS, elf->elf_class),
1273 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
1274 else if (be_verbose > 1)
1275 printf("%s: scanning file\n", elf->filename);
1276
1277 /* init output buffer */
1278 if (!out_buffer) {
1279 out_len = sizeof(char) * 80;
1280 out_buffer = xmalloc(out_len);
1281 }
1282 *out_buffer = '\0';
1283
1284 /* show the header */
1285 if (!be_quiet && show_banner) {
1286 for (i = 0; out_format[i]; ++i) {
1287 if (!IS_MODIFIER(out_format[i])) continue;
1288
1289 switch (out_format[++i]) {
1290 case '+': break;
1291 case '%': break;
1292 case '#': break;
1293 case 'F':
1294 case 'p':
1295 case 'f': prints("FILE "); found_file = 1; break;
1296 case 'o': prints(" TYPE "); break;
1297 case 'x': prints(" PAX "); break;
1298 case 'e': prints("STK/REL/PTL "); break;
1299 case 't': prints("TEXTREL "); break;
1300 case 'r': prints("RPATH "); break;
1301 case 'M': prints("CLASS "); break;
1302 case 'n': prints("NEEDED "); break;
1303 case 'i': prints("INTERP "); break;
1304 case 'b': prints("BIND "); break;
1305 case 'Z': prints("SIZE "); break;
1306 case 'S': prints("SONAME "); break;
1307 case 's': prints("SYM "); break;
1308 case 'N': prints("LIB "); break;
1309 case 'T': prints("TEXTRELS "); break;
1310 case 'k': prints("SECTION "); break;
1311 case 'a': prints("ARCH "); break;
1312 case 'I': prints("OSABI "); break;
1313 case 'Y': prints("EABI "); break;
1314 case 'O': prints("PERM "); break;
1315 case 'D': prints("ENDIAN "); break;
1316 default: warnf("'%c' has no title ?", out_format[i]);
1317 }
1318 }
1319 if (!found_file) prints("FILE ");
1320 prints("\n");
1321 found_file = 0;
1322 show_banner = 0;
1323 }
1324
1325 /* dump all the good stuff */
1326 for (i = 0; out_format[i]; ++i) {
1327 const char *out;
1328 const char *tmp;
1329 static char ubuf[sizeof(unsigned long)*2];
1330 if (!IS_MODIFIER(out_format[i])) {
1331 xchrcat(&out_buffer, out_format[i], &out_len);
1332 continue;
1333 }
1334
1335 out = NULL;
1336 be_wewy_wewy_quiet = (out_format[i] == '#');
1337 be_semi_verbose = (out_format[i] == '+');
1338 switch (out_format[++i]) {
1339 case '+':
1340 case '%':
1341 case '#':
1342 xchrcat(&out_buffer, out_format[i], &out_len); break;
1343 case 'F':
1344 found_file = 1;
1345 if (be_wewy_wewy_quiet) break;
1346 xstrcat(&out_buffer, elf->filename, &out_len);
1347 break;
1348 case 'p':
1349 found_file = 1;
1350 if (be_wewy_wewy_quiet) break;
1351 tmp = elf->filename;
1352 if (search_path) {
1353 ssize_t len_search = strlen(search_path);
1354 ssize_t len_file = strlen(elf->filename);
1355 if (!strncmp(elf->filename, search_path, len_search) && \
1356 len_file > len_search)
1357 tmp += len_search;
1358 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1359 }
1360 xstrcat(&out_buffer, tmp, &out_len);
1361 break;
1362 case 'f':
1363 found_file = 1;
1364 if (be_wewy_wewy_quiet) break;
1365 tmp = strrchr(elf->filename, '/');
1366 tmp = (tmp == NULL ? elf->filename : tmp+1);
1367 xstrcat(&out_buffer, tmp, &out_len);
1368 break;
1369 case 'o': out = get_elfetype(elf); break;
1370 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
1371 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
1372 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1373 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
1374 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1375 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1376 case 'D': out = get_endian(elf); break;
1377 case 'O': out = strfileperms(elf->filename); break;
1378 case 'n':
1379 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
1380 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1381 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1382 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
1383 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1384 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1385 case 'a': out = get_elfemtype(elf); break;
1386 case 'I': out = get_elfosabi(elf); break;
1387 case 'Y': out = get_elf_eabi(elf); break;
1388 case 'Z': snprintf(ubuf, sizeof(ubuf), "%lu", (unsigned long)elf->len); out = ubuf; break;;
1389 default: warnf("'%c' has no scan code?", out_format[i]);
1390 }
1391 if (out)
1392 xstrcat(&out_buffer, out, &out_len);
1393 }
1394
1395 #define FOUND_SOMETHING() \
1396 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1397 found_rpath || found_needed || found_interp || found_bind || \
1398 found_soname || found_sym || found_lib || found_textrels || found_section )
1399
1400 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1401 xchrcat(&out_buffer, ' ', &out_len);
1402 xstrcat(&out_buffer, elf->filename, &out_len);
1403 }
1404 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
1405 puts(out_buffer);
1406 fflush(stdout);
1407 }
1408
1409 return 0;
1410 }
1411
1412 /* scan a single elf */
1413 static int scanelf_elf(const char *filename, int fd, size_t len)
1414 {
1415 int ret = 1;
1416 elfobj *elf;
1417
1418 /* verify this is real ELF */
1419 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1420 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1421 return ret;
1422 }
1423 switch (match_bits) {
1424 case 32:
1425 if (elf->elf_class != ELFCLASS32)
1426 goto label_done;
1427 break;
1428 case 64:
1429 if (elf->elf_class != ELFCLASS64)
1430 goto label_done;
1431 break;
1432 default: break;
1433 }
1434 if (match_etypes) {
1435 char sbuf[126];
1436 strncpy(sbuf, match_etypes, sizeof(sbuf));
1437 if (strchr(match_etypes, ',') != NULL) {
1438 char *p;
1439 while ((p = strrchr(sbuf, ',')) != NULL) {
1440 *p = 0;
1441 if (etype_lookup(p+1) == get_etype(elf))
1442 goto label_ret;
1443 }
1444 }
1445 if (etype_lookup(sbuf) != get_etype(elf))
1446 goto label_done;
1447 }
1448
1449 label_ret:
1450 ret = scanelf_elfobj(elf);
1451
1452 label_done:
1453 unreadelf(elf);
1454 return ret;
1455 }
1456
1457 /* scan an archive of elfs */
1458 static int scanelf_archive(const char *filename, int fd, size_t len)
1459 {
1460 archive_handle *ar;
1461 archive_member *m;
1462 char *ar_buffer;
1463 elfobj *elf;
1464
1465 ar = ar_open_fd(filename, fd);
1466 if (ar == NULL)
1467 return 1;
1468
1469 ar_buffer = mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1470 while ((m = ar_next(ar)) != NULL) {
1471 off_t cur_pos = lseek(fd, 0, SEEK_CUR);
1472 if (cur_pos == -1)
1473 errp("lseek() failed");
1474 elf = readelf_buffer(m->name, ar_buffer + cur_pos, m->size);
1475 if (elf) {
1476 scanelf_elfobj(elf);
1477 unreadelf(elf);
1478 }
1479 }
1480 munmap(ar_buffer, len);
1481
1482 return 0;
1483 }
1484 /* scan a file which may be an elf or an archive or some other magical beast */
1485 static int scanelf_file(const char *filename, const struct stat *st_cache)
1486 {
1487 const struct stat *st = st_cache;
1488 struct stat symlink_st;
1489 int fd;
1490
1491 /* always handle regular files and handle symlinked files if no -y */
1492 if (S_ISLNK(st->st_mode)) {
1493 if (!scan_symlink) return 1;
1494 stat(filename, &symlink_st);
1495 st = &symlink_st;
1496 }
1497
1498 if (!S_ISREG(st->st_mode)) {
1499 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1500 return 1;
1501 }
1502
1503 if (match_perms) {
1504 if ((st->st_mode | match_perms) != st->st_mode)
1505 return 1;
1506 }
1507 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1508 return 1;
1509
1510 if (scanelf_elf(filename, fd, st->st_size) == 1 && scan_archives)
1511 /* if it isn't an ELF, maybe it's an .a archive */
1512 scanelf_archive(filename, fd, st->st_size);
1513
1514 close(fd);
1515 return 0;
1516 }
1517
1518 static const char *maybe_add_root(const char *fname, char *buf)
1519 {
1520 if (root && strncmp(fname, root, strlen(root))) {
1521 strcpy(buf, root);
1522 strncat(buf, fname, __PAX_UTILS_PATH_MAX - strlen(root) - 1);
1523 fname = buf;
1524 }
1525 return fname;
1526 }
1527
1528 /* scan a directory for ET_EXEC files and print when we find one */
1529 static int scanelf_dir(const char *path)
1530 {
1531 register DIR *dir;
1532 register struct dirent *dentry;
1533 struct stat st_top, st;
1534 char buf[__PAX_UTILS_PATH_MAX];
1535 char _path[__PAX_UTILS_PATH_MAX];
1536 size_t pathlen = 0, len = 0;
1537 int ret = 0;
1538
1539 path = maybe_add_root(path, _path);
1540
1541 /* make sure path exists */
1542 if (lstat(path, &st_top) == -1) {
1543 if (be_verbose > 2) printf("%s: does not exist\n", path);
1544 return 1;
1545 }
1546
1547 /* ok, if it isn't a directory, assume we can open it */
1548 if (!S_ISDIR(st_top.st_mode)) {
1549 return scanelf_file(path, &st_top);
1550 }
1551
1552 /* now scan the dir looking for fun stuff */
1553 if ((dir = opendir(path)) == NULL) {
1554 warnf("could not opendir %s: %s", path, strerror(errno));
1555 return 1;
1556 }
1557 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1558
1559 pathlen = strlen(path);
1560 while ((dentry = readdir(dir))) {
1561 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1562 continue;
1563 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
1564 if (len >= sizeof(buf)) {
1565 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1566 (unsigned long)len, (unsigned long)sizeof(buf));
1567 continue;
1568 }
1569 snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name);
1570 if (lstat(buf, &st) != -1) {
1571 if (S_ISREG(st.st_mode))
1572 ret = scanelf_file(buf, &st);
1573 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1574 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1575 ret = scanelf_dir(buf);
1576 }
1577 }
1578 }
1579 closedir(dir);
1580 return ret;
1581 }
1582
1583 static int scanelf_from_file(const char *filename)
1584 {
1585 FILE *fp;
1586 char *p, *path;
1587 size_t len;
1588 int ret;
1589
1590 if (strcmp(filename, "-") == 0)
1591 fp = stdin;
1592 else if ((fp = fopen(filename, "r")) == NULL)
1593 return 1;
1594
1595 path = NULL;
1596 len = 0;
1597 ret = 0;
1598 while (getline(&path, &len, fp) != -1) {
1599 if ((p = strchr(path, '\n')) != NULL)
1600 *p = 0;
1601 search_path = path;
1602 ret = scanelf_dir(path);
1603 }
1604 free(path);
1605
1606 if (fp != stdin)
1607 fclose(fp);
1608
1609 return ret;
1610 }
1611
1612 #if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1613
1614 static int load_ld_cache_config(int i, const char *fname)
1615 {
1616 FILE *fp = NULL;
1617 char *p, *path;
1618 size_t len;
1619 char _fname[__PAX_UTILS_PATH_MAX];
1620
1621 fname = maybe_add_root(fname, _fname);
1622
1623 if ((fp = fopen(fname, "r")) == NULL)
1624 return i;
1625
1626 path = NULL;
1627 len = 0;
1628 while (getline(&path, &len, fp) != -1) {
1629 if ((p = strrchr(path, '\r')) != NULL)
1630 *p = 0;
1631 if ((p = strchr(path, '\n')) != NULL)
1632 *p = 0;
1633
1634 /* recursive includes of the same file will make this segfault. */
1635 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1636 glob_t gl;
1637 size_t x;
1638 char gpath[__PAX_UTILS_PATH_MAX];
1639
1640 memset(gpath, 0, sizeof(gpath));
1641 if (root)
1642 strcpy(gpath, root);
1643
1644 if (path[8] != '/')
1645 snprintf(gpath+strlen(gpath), sizeof(gpath)-strlen(gpath), "/etc/%s", &path[8]);
1646 else
1647 strncpy(gpath+strlen(gpath), &path[8], sizeof(gpath)-strlen(gpath));
1648
1649 if (glob(gpath, 0, NULL, &gl) == 0) {
1650 for (x = 0; x < gl.gl_pathc; ++x) {
1651 /* try to avoid direct loops */
1652 if (strcmp(gl.gl_pathv[x], fname) == 0)
1653 continue;
1654 i = load_ld_cache_config(i, gl.gl_pathv[x]);
1655 }
1656 globfree(&gl);
1657 continue;
1658 }
1659 }
1660
1661 if (*path != '/')
1662 continue;
1663
1664 xarraypush(ldpaths, path, strlen(path));
1665 }
1666 free(path);
1667
1668 fclose(fp);
1669
1670 return i;
1671 }
1672
1673 #elif defined(__FreeBSD__) || defined(__DragonFly__)
1674
1675 static int load_ld_cache_config(int i, const char *fname)
1676 {
1677 FILE *fp = NULL;
1678 char *b = NULL, *p;
1679 struct elfhints_hdr hdr;
1680 char _fname[__PAX_UTILS_PATH_MAX];
1681
1682 fname = maybe_add_root(fname, _fname);
1683
1684 if ((fp = fopen(fname, "r")) == NULL)
1685 return i;
1686
1687 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1688 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1689 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1690 {
1691 fclose(fp);
1692 return i;
1693 }
1694
1695 b = xmalloc(hdr.dirlistlen + 1);
1696 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1697 fclose(fp);
1698 free(b);
1699 return i;
1700 }
1701
1702 while ((p = strsep(&b, ":"))) {
1703 if (*p == '\0')
1704 continue;
1705 xarraypush(ldpaths, p, strlen(p));
1706 }
1707
1708 free(b);
1709 fclose(fp);
1710 return i;
1711 }
1712
1713 #else
1714 #ifdef __ELF__
1715 #warning Cache config support not implemented for your target
1716 #endif
1717 static int load_ld_cache_config(int i, const char *fname)
1718 {
1719 return 0;
1720 }
1721 #endif
1722
1723 /* scan /etc/ld.so.conf for paths */
1724 static void scanelf_ldpath(void)
1725 {
1726 char scan_l, scan_ul, scan_ull;
1727 size_t n;
1728 const char *ldpath;
1729 int i = 0;
1730
1731 if (array_cnt(ldpaths) == 0)
1732 err("Unable to load any paths from ld.so.conf");
1733
1734 scan_l = scan_ul = scan_ull = 0;
1735
1736 array_for_each(ldpaths, n, ldpath) {
1737 if (!scan_l && !strcmp(ldpath, "/lib")) scan_l = 1;
1738 if (!scan_ul && !strcmp(ldpath, "/usr/lib")) scan_ul = 1;
1739 if (!scan_ull && !strcmp(ldpath, "/usr/local/lib")) scan_ull = 1;
1740 scanelf_dir(ldpath);
1741 ++i;
1742 }
1743
1744 if (!scan_l) scanelf_dir("/lib");
1745 if (!scan_ul) scanelf_dir("/usr/lib");
1746 if (!scan_ull) scanelf_dir("/usr/local/lib");
1747 }
1748
1749 /* scan env PATH for paths */
1750 static void scanelf_envpath(void)
1751 {
1752 char *path, *p;
1753
1754 path = getenv("PATH");
1755 if (!path)
1756 err("PATH is not set in your env !");
1757 path = xstrdup(path);
1758
1759 while ((p = strrchr(path, ':')) != NULL) {
1760 scanelf_dir(p + 1);
1761 *p = 0;
1762 }
1763
1764 free(path);
1765 }
1766
1767 /* usage / invocation handling functions */ /* Free Flags: c d j u w G H J K P Q U W */
1768 #define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZCBhV"
1769 #define a_argument required_argument
1770 static struct option const long_opts[] = {
1771 {"path", no_argument, NULL, 'p'},
1772 {"ldpath", no_argument, NULL, 'l'},
1773 {"root", a_argument, NULL, 128},
1774 {"recursive", no_argument, NULL, 'R'},
1775 {"mount", no_argument, NULL, 'm'},
1776 {"symlink", no_argument, NULL, 'y'},
1777 {"archives", no_argument, NULL, 'A'},
1778 {"ldcache", no_argument, NULL, 'L'},
1779 {"fix", no_argument, NULL, 'X'},
1780 {"setpax", a_argument, NULL, 'z'},
1781 {"pax", no_argument, NULL, 'x'},
1782 {"header", no_argument, NULL, 'e'},
1783 {"textrel", no_argument, NULL, 't'},
1784 {"rpath", no_argument, NULL, 'r'},
1785 {"needed", no_argument, NULL, 'n'},
1786 {"interp", no_argument, NULL, 'i'},
1787 {"bind", no_argument, NULL, 'b'},
1788 {"soname", no_argument, NULL, 'S'},
1789 {"symbol", a_argument, NULL, 's'},
1790 {"section", a_argument, NULL, 'k'},
1791 {"lib", a_argument, NULL, 'N'},
1792 {"gmatch", no_argument, NULL, 'g'},
1793 {"textrels", no_argument, NULL, 'T'},
1794 {"etype", a_argument, NULL, 'E'},
1795 {"bits", a_argument, NULL, 'M'},
1796 {"endian", no_argument, NULL, 'D'},
1797 {"osabi", no_argument, NULL, 'I'},
1798 {"eabi", no_argument, NULL, 'Y'},
1799 {"perms", a_argument, NULL, 'O'},
1800 {"size", no_argument, NULL, 'Z'},
1801 {"all", no_argument, NULL, 'a'},
1802 {"quiet", no_argument, NULL, 'q'},
1803 {"verbose", no_argument, NULL, 'v'},
1804 {"format", a_argument, NULL, 'F'},
1805 {"from", a_argument, NULL, 'f'},
1806 {"file", a_argument, NULL, 'o'},
1807 {"nocolor", no_argument, NULL, 'C'},
1808 {"nobanner", no_argument, NULL, 'B'},
1809 {"help", no_argument, NULL, 'h'},
1810 {"version", no_argument, NULL, 'V'},
1811 {NULL, no_argument, NULL, 0x0}
1812 };
1813
1814 static const char * const opts_help[] = {
1815 "Scan all directories in PATH environment",
1816 "Scan all directories in /etc/ld.so.conf",
1817 "Root directory (use with -l or -p)",
1818 "Scan directories recursively",
1819 "Don't recursively cross mount points",
1820 "Don't scan symlinks",
1821 "Scan archives (.a files)",
1822 "Utilize ld.so.cache information (use with -r/-n)",
1823 "Try and 'fix' bad things (use with -r/-e)",
1824 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1825 "Print PaX markings",
1826 "Print GNU_STACK/PT_LOAD markings",
1827 "Print TEXTREL information",
1828 "Print RPATH information",
1829 "Print NEEDED information",
1830 "Print INTERP information",
1831 "Print BIND information",
1832 "Print SONAME information",
1833 "Find a specified symbol",
1834 "Find a specified section",
1835 "Find a specified library",
1836 "Use regex matching rather than string compare (use with -s)",
1837 "Locate cause of TEXTREL",
1838 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1839 "Print only ELF files matching numeric bits",
1840 "Print Endianness",
1841 "Print OSABI",
1842 "Print EABI (EM_ARM Only)",
1843 "Print only ELF files matching octal permissions",
1844 "Print ELF file size",
1845 "Print all useful/simple info\n",
1846 "Only output 'bad' things",
1847 "Be verbose (can be specified more than once)",
1848 "Use specified format for output",
1849 "Read input stream from a filename",
1850 "Write output stream to a filename",
1851 "Don't emit color in output",
1852 "Don't display the header",
1853 "Print this help and exit",
1854 "Print version and exit",
1855 NULL
1856 };
1857
1858 /* display usage and exit */
1859 static void usage(int status)
1860 {
1861 unsigned long i;
1862 printf("* Scan ELF binaries for stuff\n\n"
1863 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1864 printf("Options: -[%s]\n", PARSE_FLAGS);
1865 for (i = 0; long_opts[i].name; ++i)
1866 if (long_opts[i].has_arg == no_argument)
1867 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
1868 long_opts[i].name, opts_help[i]);
1869 else if (long_opts[i].val > '~')
1870 printf(" --%-7s <arg> * %s\n",
1871 long_opts[i].name, opts_help[i]);
1872 else
1873 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
1874 long_opts[i].name, opts_help[i]);
1875
1876 puts("\nFor more information, see the scanelf(1) manpage");
1877 exit(status);
1878 }
1879
1880 /* parse command line arguments and preform needed actions */
1881 #define do_pax_state(option, flag) \
1882 if (islower(option)) { \
1883 flags &= ~PF_##flag; \
1884 flags |= PF_NO##flag; \
1885 } else { \
1886 flags &= ~PF_NO##flag; \
1887 flags |= PF_##flag; \
1888 }
1889 static int parseargs(int argc, char *argv[])
1890 {
1891 int i;
1892 const char *from_file = NULL;
1893 int ret = 0;
1894
1895 opterr = 0;
1896 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1897 switch (i) {
1898
1899 case 'V':
1900 printf("pax-utils-%s: %s compiled %s\n%s\n"
1901 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
1902 VERSION, __FILE__, __DATE__, rcsid, argv0);
1903 exit(EXIT_SUCCESS);
1904 break;
1905 case 'h': usage(EXIT_SUCCESS); break;
1906 case 'f':
1907 if (from_file) warn("You prob don't want to specify -f twice");
1908 from_file = optarg;
1909 break;
1910 case 'E':
1911 match_etypes = optarg;
1912 break;
1913 case 'M':
1914 match_bits = atoi(optarg);
1915 if (match_bits == 0) {
1916 if (strcmp(optarg, "ELFCLASS32") == 0)
1917 match_bits = 32;
1918 if (strcmp(optarg, "ELFCLASS64") == 0)
1919 match_bits = 64;
1920 }
1921 break;
1922 case 'O':
1923 if (sscanf(optarg, "%o", &match_perms) == -1)
1924 match_bits = 0;
1925 break;
1926 case 'o': {
1927 if (freopen(optarg, "w", stdout) == NULL)
1928 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1929 break;
1930 }
1931 case 'k':
1932 xarraypush(find_section_arr, optarg, strlen(optarg));
1933 break;
1934 case 's': {
1935 if (find_sym) warn("You prob don't want to specify -s twice");
1936 find_sym = optarg;
1937 break;
1938 }
1939 case 'N':
1940 xarraypush(find_lib_arr, optarg, strlen(optarg));
1941 break;
1942 case 'F': {
1943 if (out_format) warn("You prob don't want to specify -F twice");
1944 out_format = optarg;
1945 break;
1946 }
1947 case 'z': {
1948 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1949 size_t x;
1950
1951 for (x = 0; x < strlen(optarg); x++) {
1952 switch (optarg[x]) {
1953 case 'p':
1954 case 'P':
1955 do_pax_state(optarg[x], PAGEEXEC);
1956 break;
1957 case 's':
1958 case 'S':
1959 do_pax_state(optarg[x], SEGMEXEC);
1960 break;
1961 case 'm':
1962 case 'M':
1963 do_pax_state(optarg[x], MPROTECT);
1964 break;
1965 case 'e':
1966 case 'E':
1967 do_pax_state(optarg[x], EMUTRAMP);
1968 break;
1969 case 'r':
1970 case 'R':
1971 do_pax_state(optarg[x], RANDMMAP);
1972 break;
1973 case 'x':
1974 case 'X':
1975 do_pax_state(optarg[x], RANDEXEC);
1976 break;
1977 default:
1978 break;
1979 }
1980 }
1981 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
1982 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
1983 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
1984 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
1985 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1986 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1987 setpax = flags;
1988 break;
1989 }
1990 case 'Z': show_size = 1; break;
1991 case 'g': g_match = 1; break;
1992 case 'L': use_ldcache = 1; break;
1993 case 'y': scan_symlink = 0; break;
1994 case 'A': scan_archives = 1; break;
1995 case 'C': color_init(true); break;
1996 case 'B': show_banner = 0; break;
1997 case 'l': scan_ldpath = 1; break;
1998 case 'p': scan_envpath = 1; break;
1999 case 'R': dir_recurse = 1; break;
2000 case 'm': dir_crossmount = 0; break;
2001 case 'X': ++fix_elf; break;
2002 case 'x': show_pax = 1; break;
2003 case 'e': show_phdr = 1; break;
2004 case 't': show_textrel = 1; break;
2005 case 'r': show_rpath = 1; break;
2006 case 'n': show_needed = 1; break;
2007 case 'i': show_interp = 1; break;
2008 case 'b': show_bind = 1; break;
2009 case 'S': show_soname = 1; break;
2010 case 'T': show_textrels = 1; break;
2011 case 'q': be_quiet = 1; break;
2012 case 'v': be_verbose = (be_verbose % 20) + 1; break;
2013 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
2014 case 'D': show_endian = 1; break;
2015 case 'I': show_osabi = 1; break;
2016 case 'Y': show_eabi = 1; break;
2017 case 128:
2018 root = optarg;
2019 break;
2020 case ':':
2021 err("Option '%c' is missing parameter", optopt);
2022 case '?':
2023 err("Unknown option '%c' or argument missing", optopt);
2024 default:
2025 err("Unhandled option '%c'; please report this", i);
2026 }
2027 }
2028 if (show_textrels && be_verbose)
2029 has_objdump = bin_in_path("objdump");
2030 /* flatten arrays for display */
2031 if (array_cnt(find_lib_arr))
2032 find_lib = array_flatten_str(find_lib_arr);
2033 if (array_cnt(find_section_arr))
2034 find_section = array_flatten_str(find_section_arr);
2035 /* let the format option override all other options */
2036 if (out_format) {
2037 show_pax = show_phdr = show_textrel = show_rpath = \
2038 show_needed = show_interp = show_bind = show_soname = \
2039 show_textrels = show_perms = show_endian = show_size = \
2040 show_osabi = show_eabi = 0;
2041 for (i = 0; out_format[i]; ++i) {
2042 if (!IS_MODIFIER(out_format[i])) continue;
2043
2044 switch (out_format[++i]) {
2045 case '+': break;
2046 case '%': break;
2047 case '#': break;
2048 case 'F': break;
2049 case 'p': break;
2050 case 'f': break;
2051 case 'k': break;
2052 case 's': break;
2053 case 'N': break;
2054 case 'o': break;
2055 case 'a': break;
2056 case 'M': break;
2057 case 'Z': show_size = 1; break;
2058 case 'D': show_endian = 1; break;
2059 case 'I': show_osabi = 1; break;
2060 case 'Y': show_eabi = 1; break;
2061 case 'O': show_perms = 1; break;
2062 case 'x': show_pax = 1; break;
2063 case 'e': show_phdr = 1; break;
2064 case 't': show_textrel = 1; break;
2065 case 'r': show_rpath = 1; break;
2066 case 'n': show_needed = 1; break;
2067 case 'i': show_interp = 1; break;
2068 case 'b': show_bind = 1; break;
2069 case 'S': show_soname = 1; break;
2070 case 'T': show_textrels = 1; break;
2071 default:
2072 err("Invalid format specifier '%c' (byte %i)",
2073 out_format[i], i+1);
2074 }
2075 }
2076
2077 /* construct our default format */
2078 } else {
2079 size_t fmt_len = 30;
2080 out_format = xmalloc(sizeof(char) * fmt_len);
2081 *out_format = '\0';
2082 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
2083 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
2084 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
2085 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
2086 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
2087 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
2088 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
2089 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
2090 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
2091 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
2092 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
2093 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
2094 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
2095 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
2096 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
2097 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
2098 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
2099 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
2100 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
2101 }
2102 if (be_verbose > 2) printf("Format: %s\n", out_format);
2103
2104 /* now lets actually do the scanning */
2105 if (scan_ldpath || use_ldcache)
2106 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
2107 if (scan_ldpath) scanelf_ldpath();
2108 if (scan_envpath) scanelf_envpath();
2109 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
2110 from_file = "-";
2111 if (from_file) {
2112 scanelf_from_file(from_file);
2113 from_file = *argv;
2114 }
2115 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
2116 err("Nothing to scan !?");
2117 while (optind < argc) {
2118 search_path = argv[optind++];
2119 ret = scanelf_dir(search_path);
2120 }
2121
2122 /* clean up */
2123 xarrayfree(ldpaths);
2124 xarrayfree(find_lib_arr);
2125 xarrayfree(find_section_arr);
2126 free(find_lib);
2127 free(find_section);
2128
2129 if (ldcache != 0)
2130 munmap(ldcache, ldcache_size);
2131 return ret;
2132 }
2133
2134 static char **get_split_env(const char *envvar)
2135 {
2136 const char *delims = " \t\n";
2137 char **envvals = NULL;
2138 char *env, *s;
2139 int nentry;
2140
2141 if ((env = getenv(envvar)) == NULL)
2142 return NULL;
2143
2144 env = xstrdup(env);
2145 if (env == NULL)
2146 return NULL;
2147
2148 s = strtok(env, delims);
2149 if (s == NULL) {
2150 free(env);
2151 return NULL;
2152 }
2153
2154 nentry = 0;
2155 while (s != NULL) {
2156 ++nentry;
2157 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
2158 envvals[nentry-1] = s;
2159 s = strtok(NULL, delims);
2160 }
2161 envvals[nentry] = NULL;
2162
2163 /* don't want to free(env) as it contains the memory that backs
2164 * the envvals array of strings */
2165 return envvals;
2166 }
2167
2168 static void parseenv(void)
2169 {
2170 color_init(false);
2171 qa_textrels = get_split_env("QA_TEXTRELS");
2172 qa_execstack = get_split_env("QA_EXECSTACK");
2173 qa_wx_load = get_split_env("QA_WX_LOAD");
2174 }
2175
2176 #ifdef __PAX_UTILS_CLEANUP
2177 static void cleanup(void)
2178 {
2179 free(out_format);
2180 free(qa_textrels);
2181 free(qa_execstack);
2182 free(qa_wx_load);
2183 }
2184 #endif
2185
2186 int main(int argc, char *argv[])
2187 {
2188 int ret;
2189 if (argc < 2)
2190 usage(EXIT_FAILURE);
2191 parseenv();
2192 ret = parseargs(argc, argv);
2193 fclose(stdout);
2194 #ifdef __PAX_UTILS_CLEANUP
2195 cleanup();
2196 warn("The calls to add/delete heap should be off:\n"
2197 "\t- 1 due to the out_buffer not being freed in scanelf_file()\n"
2198 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
2199 #endif
2200 return ret;
2201 }
2202
2203 /* Match filename against entries in matchlist, return TRUE
2204 * if the file is listed */
2205 static int file_matches_list(const char *filename, char **matchlist)
2206 {
2207 char **file;
2208 char *match;
2209 char buf[__PAX_UTILS_PATH_MAX];
2210
2211 if (matchlist == NULL)
2212 return 0;
2213
2214 for (file = matchlist; *file != NULL; file++) {
2215 if (search_path) {
2216 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2217 match = buf;
2218 } else {
2219 match = *file;
2220 }
2221 if (fnmatch(match, filename, 0) == 0)
2222 return 1;
2223 }
2224 return 0;
2225 }

  ViewVC Help
Powered by ViewVC 1.1.20