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Revision 1.224 - (show annotations) (download) (as text)
Mon Aug 8 01:56:16 2011 UTC (2 years, 11 months ago) by vapier
Branch: MAIN
Changes since 1.223: +4 -4 lines
File MIME type: text/x-csrc
fixup style in previous root patch

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 1.223 2011/07/30 17:08:30 solar 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 1.223 2011/07/30 17:08:30 solar 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 static int scanelf_elfobj(elfobj *elf);
20 static int scanelf_elf(const char *filename, int fd, size_t len);
21 static int scanelf_archive(const char *filename, int fd, size_t len);
22 static int scanelf_file(const char *filename, const struct stat *st_cache);
23 static int scanelf_dir(const char *path);
24 static void scanelf_ldpath(void);
25 static void scanelf_envpath(void);
26 static void usage(int status);
27 static char **get_split_env(const char *envvar);
28 static void parseenv(void);
29 static int parseargs(int argc, char *argv[]);
30
31 /* variables to control behavior */
32 static char match_etypes[126] = "";
33 static char *ldpaths[256];
34 static char scan_ldpath = 0;
35 static char scan_envpath = 0;
36 static char scan_symlink = 1;
37 static char scan_archives = 0;
38 static char dir_recurse = 0;
39 static char dir_crossmount = 1;
40 static char show_pax = 0;
41 static char show_perms = 0;
42 static char show_size = 0;
43 static char show_phdr = 0;
44 static char show_textrel = 0;
45 static char show_rpath = 0;
46 static char show_needed = 0;
47 static char show_interp = 0;
48 static char show_bind = 0;
49 static char show_soname = 0;
50 static char show_textrels = 0;
51 static char show_banner = 1;
52 static char show_endian = 0;
53 static char show_osabi = 0;
54 static char show_eabi = 0;
55 static char be_quiet = 0;
56 static char be_verbose = 0;
57 static char be_wewy_wewy_quiet = 0;
58 static char be_semi_verbose = 0;
59 static char *find_sym = NULL;
60 static char *find_lib = NULL;
61 static char *find_section = NULL;
62 static char *out_format = NULL;
63 static char *search_path = NULL;
64 static char fix_elf = 0;
65 static char g_match = 0;
66 static char use_ldcache = 0;
67
68 static char **qa_textrels = NULL;
69 static char **qa_execstack = NULL;
70 static char **qa_wx_load = NULL;
71 static char *root;
72
73 static int match_bits = 0;
74 static unsigned int match_perms = 0;
75 static void *ldcache = NULL;
76 static size_t ldcache_size = 0;
77 static unsigned long setpax = 0UL;
78
79 static int has_objdump = 0;
80
81 /* find the path to a file by name */
82 static char *which(const char *fname)
83 {
84 static char fullpath[__PAX_UTILS_PATH_MAX];
85 char *path, *p;
86
87 path = getenv("PATH");
88 if (!path)
89 return NULL;
90
91 path = xstrdup(path);
92 while ((p = strrchr(path, ':')) != NULL) {
93 snprintf(fullpath, sizeof(fullpath), "%s/%s", p + 1, fname);
94 *p = 0;
95 if (access(fullpath, R_OK) != -1) {
96 free(path);
97 return fullpath;
98 }
99 }
100 free(path);
101 return NULL;
102 }
103
104 /* 1 on failure. 0 otherwise */
105 static int rematch(const char *regex, const char *match, int cflags)
106 {
107 regex_t preg;
108 int ret;
109
110 if ((match == NULL) || (regex == NULL))
111 return EXIT_FAILURE;
112
113 if ((ret = regcomp(&preg, regex, cflags))) {
114 char err[256];
115
116 if (regerror(ret, &preg, err, sizeof(err)))
117 fprintf(stderr, "regcomp failed: %s", err);
118 else
119 fprintf(stderr, "regcomp failed");
120
121 return EXIT_FAILURE;
122 }
123 ret = regexec(&preg, match, 0, NULL, 0);
124 regfree(&preg);
125
126 return ret;
127 }
128
129 /* sub-funcs for scanelf_file() */
130 static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
131 {
132 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
133
134 /* debug sections */
135 void *symtab = elf_findsecbyname(elf, ".symtab");
136 void *strtab = elf_findsecbyname(elf, ".strtab");
137 /* runtime sections */
138 void *dynsym = elf_findsecbyname(elf, ".dynsym");
139 void *dynstr = elf_findsecbyname(elf, ".dynstr");
140
141 #define GET_SYMTABS(B) \
142 if (elf->elf_class == ELFCLASS ## B) { \
143 if (symtab && dynsym) { \
144 Elf ## B ## _Shdr *esymtab = symtab; \
145 Elf ## B ## _Shdr *edynsym = dynsym; \
146 *sym = (EGET(esymtab->sh_size) > EGET(edynsym->sh_size)) ? symtab : dynsym; \
147 } else \
148 *sym = symtab ? symtab : dynsym; \
149 if (strtab && dynstr) { \
150 Elf ## B ## _Shdr *estrtab = strtab; \
151 Elf ## B ## _Shdr *edynstr = dynstr; \
152 *tab = (EGET(estrtab->sh_size) > EGET(edynstr->sh_size)) ? strtab : dynstr; \
153 } else \
154 *tab = strtab ? strtab : dynstr; \
155 }
156 GET_SYMTABS(32)
157 GET_SYMTABS(64)
158 }
159
160 static char *scanelf_file_pax(elfobj *elf, char *found_pax)
161 {
162 static char ret[7];
163 unsigned long i, shown;
164
165 if (!show_pax) return NULL;
166
167 shown = 0;
168 memset(&ret, 0, sizeof(ret));
169
170 if (elf->phdr) {
171 #define SHOW_PAX(B) \
172 if (elf->elf_class == ELFCLASS ## B) { \
173 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
174 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
175 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
176 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
177 continue; \
178 if (fix_elf && setpax) { \
179 /* set the paxctl flags */ \
180 ESET(phdr[i].p_flags, setpax); \
181 } \
182 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
183 continue; \
184 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
185 *found_pax = 1; \
186 ++shown; \
187 break; \
188 } \
189 }
190 SHOW_PAX(32)
191 SHOW_PAX(64)
192 }
193
194 if (fix_elf && setpax) {
195 /* set the chpax settings */
196 if (elf->elf_class == ELFCLASS32) {
197 if (EHDR32(elf->ehdr)->e_type == ET_DYN || EHDR32(elf->ehdr)->e_type == ET_EXEC)
198 ESET(EHDR32(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
199 } else {
200 if (EHDR64(elf->ehdr)->e_type == ET_DYN || EHDR64(elf->ehdr)->e_type == ET_EXEC)
201 ESET(EHDR64(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
202 }
203 }
204
205 /* fall back to EI_PAX if no PT_PAX was found */
206 if (!*ret) {
207 static char *paxflags;
208 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
209 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
210 *found_pax = 1;
211 return (be_wewy_wewy_quiet ? NULL : paxflags);
212 }
213 strncpy(ret, paxflags, sizeof(ret));
214 }
215
216 if (be_wewy_wewy_quiet || (be_quiet && !shown))
217 return NULL;
218 else
219 return ret;
220 }
221
222 static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
223 {
224 static char ret[12];
225 char *found;
226 unsigned long i, shown, multi_stack, multi_relro, multi_load;
227 int max_pt_load;
228
229 if (!show_phdr) return NULL;
230
231 memcpy(ret, "--- --- ---\0", 12);
232
233 shown = 0;
234 multi_stack = multi_relro = multi_load = 0;
235 max_pt_load = elf_max_pt_load(elf);
236
237 #define NOTE_GNU_STACK ".note.GNU-stack"
238 #define SHOW_PHDR(B) \
239 if (elf->elf_class == ELFCLASS ## B) { \
240 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
241 Elf ## B ## _Off offset; \
242 uint32_t flags, check_flags; \
243 if (elf->phdr != NULL) { \
244 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
245 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
246 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
247 if (multi_stack++) \
248 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
249 if (file_matches_list(elf->filename, qa_execstack)) \
250 continue; \
251 found = found_phdr; \
252 offset = 0; \
253 check_flags = PF_X; \
254 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
255 if (multi_relro++) \
256 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
257 found = found_relro; \
258 offset = 4; \
259 check_flags = PF_X; \
260 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
261 if (EGET(ehdr->e_type) == ET_DYN || EGET(ehdr->e_type) == ET_EXEC) \
262 if (multi_load++ > max_pt_load) \
263 warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
264 if (file_matches_list(elf->filename, qa_wx_load)) \
265 continue; \
266 found = found_load; \
267 offset = 8; \
268 check_flags = PF_W|PF_X; \
269 } else \
270 continue; \
271 flags = EGET(phdr[i].p_flags); \
272 if (be_quiet && ((flags & check_flags) != check_flags)) \
273 continue; \
274 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
275 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
276 ret[3] = ret[7] = '!'; \
277 flags = EGET(phdr[i].p_flags); \
278 } \
279 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
280 *found = 1; \
281 ++shown; \
282 } \
283 } else if (elf->shdr != NULL) { \
284 /* no program headers which means this is prob an object file */ \
285 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
286 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
287 char *str; \
288 if ((void*)strtbl > elf->data_end) \
289 goto skip_this_shdr##B; \
290 check_flags = SHF_WRITE|SHF_EXECINSTR; \
291 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
292 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
293 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
294 str = elf->data + offset; \
295 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
296 if (!strcmp(str, NOTE_GNU_STACK)) { \
297 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
298 flags = EGET(shdr[i].sh_flags); \
299 if (be_quiet && ((flags & check_flags) != check_flags)) \
300 continue; \
301 ++*found_phdr; \
302 shown = 1; \
303 if (flags & SHF_WRITE) ret[0] = 'W'; \
304 if (flags & SHF_ALLOC) ret[1] = 'A'; \
305 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
306 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
307 break; \
308 } \
309 } \
310 skip_this_shdr##B: \
311 if (!multi_stack) { \
312 if (file_matches_list(elf->filename, qa_execstack)) \
313 return NULL; \
314 *found_phdr = 1; \
315 shown = 1; \
316 memcpy(ret, "!WX", 3); \
317 } \
318 } \
319 }
320 SHOW_PHDR(32)
321 SHOW_PHDR(64)
322
323 if (be_wewy_wewy_quiet || (be_quiet && !shown))
324 return NULL;
325 else
326 return ret;
327 }
328
329 /*
330 * See if this ELF contains a DT_TEXTREL tag in any of its
331 * PT_DYNAMIC sections.
332 */
333 static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
334 {
335 static const char *ret = "TEXTREL";
336 unsigned long i;
337
338 if (!show_textrel && !show_textrels) return NULL;
339
340 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
341
342 if (elf->phdr) {
343 #define SHOW_TEXTREL(B) \
344 if (elf->elf_class == ELFCLASS ## B) { \
345 Elf ## B ## _Dyn *dyn; \
346 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
347 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
348 Elf ## B ## _Off offset; \
349 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
350 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
351 offset = EGET(phdr[i].p_offset); \
352 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
353 dyn = DYN ## B (elf->vdata + offset); \
354 while (EGET(dyn->d_tag) != DT_NULL) { \
355 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
356 *found_textrel = 1; \
357 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
358 return (be_wewy_wewy_quiet ? NULL : ret); \
359 } \
360 ++dyn; \
361 } \
362 } }
363 SHOW_TEXTREL(32)
364 SHOW_TEXTREL(64)
365 }
366
367 if (be_quiet || be_wewy_wewy_quiet)
368 return NULL;
369 else
370 return " - ";
371 }
372
373 /*
374 * Scan the .text section to see if there are any relocations in it.
375 * Should rewrite this to check PT_LOAD sections that are marked
376 * Executable rather than the section named '.text'.
377 */
378 static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
379 {
380 unsigned long s, r, rmax;
381 void *symtab_void, *strtab_void, *text_void;
382
383 if (!show_textrels) return NULL;
384
385 /* don't search for TEXTREL's if the ELF doesn't have any */
386 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
387 if (!*found_textrel) return NULL;
388
389 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
390 text_void = elf_findsecbyname(elf, ".text");
391
392 if (symtab_void && strtab_void && text_void && elf->shdr) {
393 #define SHOW_TEXTRELS(B) \
394 if (elf->elf_class == ELFCLASS ## B) { \
395 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
396 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
397 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
398 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
399 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
400 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
401 uint ## B ## _t memsz = EGET(text->sh_size); \
402 Elf ## B ## _Rel *rel; \
403 Elf ## B ## _Rela *rela; \
404 /* search the section headers for relocations */ \
405 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
406 uint32_t sh_type = EGET(shdr[s].sh_type); \
407 if (sh_type == SHT_REL) { \
408 rel = REL ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
409 rela = NULL; \
410 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
411 } else if (sh_type == SHT_RELA) { \
412 rel = NULL; \
413 rela = RELA ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
414 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
415 } else \
416 continue; \
417 /* now see if any of the relocs are in the .text */ \
418 for (r = 0; r < rmax; ++r) { \
419 unsigned long sym_max; \
420 Elf ## B ## _Addr offset_tmp; \
421 Elf ## B ## _Sym *func; \
422 Elf ## B ## _Sym *sym; \
423 Elf ## B ## _Addr r_offset; \
424 uint ## B ## _t r_info; \
425 if (sh_type == SHT_REL) { \
426 r_offset = EGET(rel[r].r_offset); \
427 r_info = EGET(rel[r].r_info); \
428 } else { \
429 r_offset = EGET(rela[r].r_offset); \
430 r_info = EGET(rela[r].r_info); \
431 } \
432 /* make sure this relocation is inside of the .text */ \
433 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
434 if (be_verbose <= 2) continue; \
435 } else \
436 *found_textrels = 1; \
437 /* locate this relocation symbol name */ \
438 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
439 if ((void*)sym > elf->data_end) { \
440 warn("%s: corrupt ELF symbol", elf->filename); \
441 continue; \
442 } \
443 sym_max = ELF ## B ## _R_SYM(r_info); \
444 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
445 sym += sym_max; \
446 else \
447 sym = NULL; \
448 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
449 /* show the raw details about this reloc */ \
450 printf(" %s: ", elf->base_filename); \
451 if (sym && sym->st_name) \
452 printf("%s", elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
453 else \
454 printf("(memory/data?)"); \
455 printf(" [0x%lX]", (unsigned long)r_offset); \
456 /* now try to find the closest symbol that this rel is probably in */ \
457 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
458 func = NULL; \
459 offset_tmp = 0; \
460 while (sym_max--) { \
461 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
462 func = sym; \
463 offset_tmp = EGET(sym->st_value); \
464 } \
465 ++sym; \
466 } \
467 printf(" in "); \
468 if (func && func->st_name) { \
469 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
470 if (r_offset > EGET(func->st_size)) \
471 printf("(optimized out: previous %s)", func_name); \
472 else \
473 printf("%s", func_name); \
474 } else \
475 printf("(optimized out)"); \
476 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
477 if (be_verbose && has_objdump) { \
478 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
479 char *sysbuf; \
480 size_t syslen; \
481 int sysret; \
482 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"; \
483 syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
484 sysbuf = xmalloc(syslen); \
485 if (end_addr < r_offset) \
486 /* not uncommon when things are optimized out */ \
487 end_addr = r_offset + 0x100; \
488 snprintf(sysbuf, syslen, sysfmt, \
489 (unsigned long)offset_tmp, \
490 (unsigned long)end_addr, \
491 elf->filename, \
492 (unsigned long)r_offset); \
493 fflush(stdout); \
494 sysret = system(sysbuf); \
495 fflush(stdout); \
496 free(sysbuf); \
497 } \
498 } \
499 } }
500 SHOW_TEXTRELS(32)
501 SHOW_TEXTRELS(64)
502 }
503 if (!*found_textrels)
504 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
505
506 return NULL;
507 }
508
509 static void rpath_security_checks(elfobj *, char *, const char *);
510 static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
511 {
512 struct stat st;
513 switch (*item) {
514 case '/': break;
515 case '.':
516 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
517 break;
518 case ':':
519 case '\0':
520 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
521 break;
522 case '$':
523 if (fstat(elf->fd, &st) != -1)
524 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
525 warnf("Security problem with %s='%s' in %s with mode set of %o",
526 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
527 break;
528 default:
529 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
530 break;
531 }
532 }
533 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
534 {
535 unsigned long i, s;
536 char *rpath, *runpath, **r;
537 void *strtbl_void;
538
539 if (!show_rpath) return;
540
541 strtbl_void = elf_findsecbyname(elf, ".dynstr");
542 rpath = runpath = NULL;
543
544 if (elf->phdr && strtbl_void) {
545 #define SHOW_RPATH(B) \
546 if (elf->elf_class == ELFCLASS ## B) { \
547 Elf ## B ## _Dyn *dyn; \
548 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
549 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
550 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
551 Elf ## B ## _Off offset; \
552 Elf ## B ## _Xword word; \
553 /* Scan all the program headers */ \
554 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
555 /* Just scan dynamic headers */ \
556 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
557 offset = EGET(phdr[i].p_offset); \
558 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
559 /* Just scan dynamic RPATH/RUNPATH headers */ \
560 dyn = DYN ## B (elf->vdata + offset); \
561 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
562 if (word == DT_RPATH) { \
563 r = &rpath; \
564 } else if (word == DT_RUNPATH) { \
565 r = &runpath; \
566 } else { \
567 ++dyn; \
568 continue; \
569 } \
570 /* Verify the memory is somewhat sane */ \
571 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
572 if (offset < (Elf ## B ## _Off)elf->len) { \
573 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
574 *r = elf->data + offset; \
575 /* cache the length in case we need to nuke this section later on */ \
576 if (fix_elf) \
577 offset = strlen(*r); \
578 /* If quiet, don't output paths in ld.so.conf */ \
579 if (be_quiet) { \
580 size_t len; \
581 char *start, *end; \
582 /* note that we only 'chop' off leading known paths. */ \
583 /* since *r is read-only memory, we can only move the ptr forward. */ \
584 start = *r; \
585 /* scan each path in : delimited list */ \
586 while (start) { \
587 rpath_security_checks(elf, start, get_elfdtype(word)); \
588 end = strchr(start, ':'); \
589 len = (end ? abs(end - start) : strlen(start)); \
590 if (use_ldcache) \
591 for (s = 0; ldpaths[s]; ++s) \
592 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
593 *r = end; \
594 /* corner case ... if RPATH reads "/usr/lib:", we want \
595 * to show ':' rather than '' */ \
596 if (end && end[1] != '\0') \
597 (*r)++; \
598 break; \
599 } \
600 if (!*r || !end) \
601 break; \
602 else \
603 start = start + len + 1; \
604 } \
605 } \
606 if (*r) { \
607 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
608 /* just nuke it */ \
609 nuke_it##B: \
610 memset(*r, 0x00, offset); \
611 *r = NULL; \
612 ESET(dyn->d_tag, DT_DEBUG); \
613 ESET(dyn->d_un.d_ptr, 0); \
614 } else if (fix_elf) { \
615 /* try to clean "bad" paths */ \
616 size_t len, tmpdir_len; \
617 char *start, *end; \
618 const char *tmpdir; \
619 start = *r; \
620 tmpdir = (getenv("TMPDIR") ? : "."); \
621 tmpdir_len = strlen(tmpdir); \
622 while (1) { \
623 end = strchr(start, ':'); \
624 if (start == end) { \
625 eat_this_path##B: \
626 len = strlen(end); \
627 memmove(start, end+1, len); \
628 start[len-1] = '\0'; \
629 end = start - 1; \
630 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
631 if (!end) { \
632 if (start == *r) \
633 goto nuke_it##B; \
634 *--start = '\0'; \
635 } else \
636 goto eat_this_path##B; \
637 } \
638 if (!end) \
639 break; \
640 start = end + 1; \
641 } \
642 if (**r == '\0') \
643 goto nuke_it##B; \
644 } \
645 if (*r) \
646 *found_rpath = 1; \
647 } \
648 } \
649 ++dyn; \
650 } \
651 } }
652 SHOW_RPATH(32)
653 SHOW_RPATH(64)
654 }
655
656 if (be_wewy_wewy_quiet) return;
657
658 if (rpath && runpath) {
659 if (!strcmp(rpath, runpath)) {
660 xstrcat(ret, runpath, ret_len);
661 } else {
662 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
663 xchrcat(ret, '{', ret_len);
664 xstrcat(ret, rpath, ret_len);
665 xchrcat(ret, ',', ret_len);
666 xstrcat(ret, runpath, ret_len);
667 xchrcat(ret, '}', ret_len);
668 }
669 } else if (rpath || runpath)
670 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
671 else if (!be_quiet)
672 xstrcat(ret, " - ", ret_len);
673 }
674
675 #define LDSO_CACHE_MAGIC "ld.so-"
676 #define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
677 #define LDSO_CACHE_VER "1.7.0"
678 #define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
679 #define FLAG_ANY -1
680 #define FLAG_TYPE_MASK 0x00ff
681 #define FLAG_LIBC4 0x0000
682 #define FLAG_ELF 0x0001
683 #define FLAG_ELF_LIBC5 0x0002
684 #define FLAG_ELF_LIBC6 0x0003
685 #define FLAG_REQUIRED_MASK 0xff00
686 #define FLAG_SPARC_LIB64 0x0100
687 #define FLAG_IA64_LIB64 0x0200
688 #define FLAG_X8664_LIB64 0x0300
689 #define FLAG_S390_LIB64 0x0400
690 #define FLAG_POWERPC_LIB64 0x0500
691 #define FLAG_MIPS64_LIBN32 0x0600
692 #define FLAG_MIPS64_LIBN64 0x0700
693
694 static char *lookup_cache_lib(elfobj *, char *);
695
696 #if defined(__GLIBC__) || defined(__UCLIBC__)
697
698 static char *lookup_cache_lib(elfobj *elf, char *fname)
699 {
700 int fd;
701 char *strs;
702 static char buf[__PAX_UTILS_PATH_MAX] = "";
703 const char cachefile[] = "/etc/ld.so.cache";
704 struct stat st;
705
706 typedef struct {
707 char magic[LDSO_CACHE_MAGIC_LEN];
708 char version[LDSO_CACHE_VER_LEN];
709 int nlibs;
710 } header_t;
711 header_t *header;
712
713 typedef struct {
714 int flags;
715 int sooffset;
716 int liboffset;
717 } libentry_t;
718 libentry_t *libent;
719
720 if (fname == NULL)
721 return NULL;
722
723 if (ldcache == NULL) {
724 if (stat(cachefile, &st))
725 return NULL;
726
727 fd = open(cachefile, O_RDONLY);
728 if (fd == -1)
729 return NULL;
730
731 /* cache these values so we only map/unmap the cache file once */
732 ldcache_size = st.st_size;
733 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
734 close(fd);
735
736 if (ldcache == MAP_FAILED) {
737 ldcache = NULL;
738 return NULL;
739 }
740
741 if (memcmp(header->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN) ||
742 memcmp(header->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
743 {
744 munmap(ldcache, ldcache_size);
745 ldcache = NULL;
746 return NULL;
747 }
748 } else
749 header = ldcache;
750
751 libent = ldcache + sizeof(header_t);
752 strs = (char *) &libent[header->nlibs];
753
754 for (fd = 0; fd < header->nlibs; ++fd) {
755 /* This should be more fine grained, but for now we assume that
756 * diff arches will not be cached together, and we ignore the
757 * the different multilib mips cases.
758 */
759 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
760 continue;
761 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
762 continue;
763
764 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
765 continue;
766
767 /* Return first hit because that is how the ldso rolls */
768 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
769 break;
770 }
771
772 return buf;
773 }
774
775 #elif defined(__NetBSD__)
776 static char *lookup_cache_lib(elfobj *elf, char *fname)
777 {
778 static char buf[__PAX_UTILS_PATH_MAX] = "";
779 static struct stat st;
780
781 char **ldpath;
782 for (ldpath = ldpaths; *ldpath != NULL; ldpath++) {
783 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", *ldpath, fname) >= sizeof(buf))
784 continue; /* if the pathname is too long, or something went wrong, ignore */
785
786 if (stat(buf, &st) != 0)
787 continue; /* if the lib doesn't exist in *ldpath, look further */
788
789 /* NetBSD doesn't actually do sanity checks, it just loads the file
790 * and if that doesn't work, continues looking in other directories.
791 * This cannot easily be safely emulated, unfortunately. For now,
792 * just assume that if it exists, it's a valid library. */
793
794 return buf;
795 }
796
797 /* not found in any path */
798 return NULL;
799 }
800 #else
801 #ifdef __ELF__
802 #warning Cache support not implemented for your target
803 #endif
804 static char *lookup_cache_lib(elfobj *elf, char *fname)
805 {
806 return NULL;
807 }
808 #endif
809
810 static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
811 {
812 unsigned long i;
813 char *needed;
814 void *strtbl_void;
815 char *p;
816
817 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
818
819 strtbl_void = elf_findsecbyname(elf, ".dynstr");
820
821 if (elf->phdr && strtbl_void) {
822 #define SHOW_NEEDED(B) \
823 if (elf->elf_class == ELFCLASS ## B) { \
824 Elf ## B ## _Dyn *dyn; \
825 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
826 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
827 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
828 Elf ## B ## _Off offset; \
829 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
830 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
831 offset = EGET(phdr[i].p_offset); \
832 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
833 dyn = DYN ## B (elf->vdata + offset); \
834 while (EGET(dyn->d_tag) != DT_NULL) { \
835 if (EGET(dyn->d_tag) == DT_NEEDED) { \
836 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
837 if (offset >= (Elf ## B ## _Off)elf->len) { \
838 ++dyn; \
839 continue; \
840 } \
841 needed = elf->data + offset; \
842 if (op == 0) { \
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 if (!strncmp(find_lib, needed, strlen( !g_match ? needed : find_lib))) { \
853 *found_lib = 1; \
854 return (be_wewy_wewy_quiet ? NULL : needed); \
855 } \
856 } \
857 } \
858 ++dyn; \
859 } \
860 } }
861 SHOW_NEEDED(32)
862 SHOW_NEEDED(64)
863 if (op == 0 && !*found_needed && be_verbose)
864 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
865 }
866
867 return NULL;
868 }
869 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
870 {
871 void *strtbl_void;
872
873 if (!show_interp) return NULL;
874
875 strtbl_void = elf_findsecbyname(elf, ".interp");
876
877 if (strtbl_void) {
878 #define SHOW_INTERP(B) \
879 if (elf->elf_class == ELFCLASS ## B) { \
880 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
881 *found_interp = 1; \
882 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
883 }
884 SHOW_INTERP(32)
885 SHOW_INTERP(64)
886 }
887 return NULL;
888 }
889 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
890 {
891 unsigned long i;
892 struct stat s;
893 char dynamic = 0;
894
895 if (!show_bind) return NULL;
896 if (!elf->phdr) return NULL;
897
898 #define SHOW_BIND(B) \
899 if (elf->elf_class == ELFCLASS ## B) { \
900 Elf ## B ## _Dyn *dyn; \
901 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
902 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
903 Elf ## B ## _Off offset; \
904 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
905 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
906 dynamic = 1; \
907 offset = EGET(phdr[i].p_offset); \
908 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
909 dyn = DYN ## B (elf->vdata + offset); \
910 while (EGET(dyn->d_tag) != DT_NULL) { \
911 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
912 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
913 { \
914 if (be_quiet) return NULL; \
915 *found_bind = 1; \
916 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
917 } \
918 ++dyn; \
919 } \
920 } \
921 }
922 SHOW_BIND(32)
923 SHOW_BIND(64)
924
925 if (be_wewy_wewy_quiet) return NULL;
926
927 /* don't output anything if quiet mode and the ELF is static or not setuid */
928 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
929 return NULL;
930 } else {
931 *found_bind = 1;
932 return (char *)(dynamic ? "LAZY" : "STATIC");
933 }
934 }
935 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
936 {
937 unsigned long i;
938 char *soname;
939 void *strtbl_void;
940
941 if (!show_soname) return NULL;
942
943 strtbl_void = elf_findsecbyname(elf, ".dynstr");
944
945 if (elf->phdr && strtbl_void) {
946 #define SHOW_SONAME(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 /* only look for soname in shared objects */ \
954 if (EGET(ehdr->e_type) != ET_DYN) \
955 return NULL; \
956 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
957 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
958 offset = EGET(phdr[i].p_offset); \
959 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
960 dyn = DYN ## B (elf->vdata + offset); \
961 while (EGET(dyn->d_tag) != DT_NULL) { \
962 if (EGET(dyn->d_tag) == DT_SONAME) { \
963 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
964 if (offset >= (Elf ## B ## _Off)elf->len) { \
965 ++dyn; \
966 continue; \
967 } \
968 soname = elf->data + offset; \
969 *found_soname = 1; \
970 return (be_wewy_wewy_quiet ? NULL : soname); \
971 } \
972 ++dyn; \
973 } \
974 } }
975 SHOW_SONAME(32)
976 SHOW_SONAME(64)
977 }
978
979 return NULL;
980 }
981
982 /*
983 * We support the symbol form:
984 * [%[modifiers]%][[+-]<symbol name>][,[.....]]
985 * If the symbol name is empty, then all symbols are matched.
986 * If the symbol name is a glob ("*"), then all symbols are dumped (debug).
987 * Do not rely on this output format at all.
988 * Otherwise the symbol name is used to search (either regex or string compare).
989 * If the first char of the symbol name is a plus ("+"), then only match
990 * defined symbols. If it's a minus ("-"), only match undefined symbols.
991 * Putting modifiers in between the percent signs allows for more in depth
992 * filters. There are groups of modifiers. If you don't specify a member
993 * of a group, then all types in that group are matched. The current
994 * groups and their types are:
995 * STT group: STT_NOTYPE:n STT_OBJECT:o STT_FUNC:f SST_FILE:F
996 * STB group: STB_LOCAL:l STB_GLOBAL:g STB_WEAK:w
997 * SHN group: SHN_UNDEF:u SHN_ABS:a SHN_COMMON:c {defined}:d
998 * The "defined" value in the SHN group does not correspond to a SHN_xxx define.
999 * You can search for multiple symbols at once by seperating with a comma (",").
1000 *
1001 * Some examples:
1002 * ELFs with a weak function "foo":
1003 * scanelf -s %wf%foo <ELFs>
1004 * ELFs that define the symbol "main":
1005 * scanelf -s +main <ELFs>
1006 * scanelf -s %d%main <ELFs>
1007 * ELFs that refer to the undefined symbol "brk":
1008 * scanelf -s -brk <ELFs>
1009 * scanelf -s %u%brk <ELFs>
1010 * All global defined objects in an ELF:
1011 * scanelf -s %ogd% <ELF>
1012 */
1013 static void
1014 scanelf_match_symname(elfobj *elf, char *found_sym, char **ret, size_t *ret_len, const char *symname,
1015 unsigned int stt, unsigned int stb, unsigned int shn, unsigned long size)
1016 {
1017 char *this_sym, *next_sym, saved = saved;
1018
1019 /* allow the user to specify a comma delimited list of symbols to search for */
1020 next_sym = NULL;
1021 do {
1022 bool inc_notype, inc_object, inc_func, inc_file,
1023 inc_local, inc_global, inc_weak,
1024 inc_def, inc_undef, inc_abs, inc_common;
1025
1026 if (next_sym) {
1027 next_sym[-1] = saved;
1028 this_sym = next_sym;
1029 } else
1030 this_sym = find_sym;
1031 if ((next_sym = strchr(this_sym, ','))) {
1032 /* make parsing easier by killing the comma temporarily */
1033 saved = *next_sym;
1034 *next_sym = '\0';
1035 next_sym += 1;
1036 }
1037
1038 /* symbol selection! */
1039 inc_notype = inc_object = inc_func = inc_file = \
1040 inc_local = inc_global = inc_weak = \
1041 inc_def = inc_undef = inc_abs = inc_common = \
1042 (*this_sym != '%');
1043
1044 /* parse the contents of %...% */
1045 if (!inc_notype) {
1046 while (*(this_sym++)) {
1047 if (*this_sym == '%') {
1048 ++this_sym;
1049 break;
1050 }
1051 switch (*this_sym) {
1052 case 'n': inc_notype = true; break;
1053 case 'o': inc_object = true; break;
1054 case 'f': inc_func = true; break;
1055 case 'F': inc_file = true; break;
1056 case 'l': inc_local = true; break;
1057 case 'g': inc_global = true; break;
1058 case 'w': inc_weak = true; break;
1059 case 'd': inc_def = true; break;
1060 case 'u': inc_undef = true; break;
1061 case 'a': inc_abs = true; break;
1062 case 'c': inc_common = true; break;
1063 default: err("invalid symbol selector '%c'", *this_sym);
1064 }
1065 }
1066
1067 /* If no types are matched, not match all */
1068 if (!inc_notype && !inc_object && !inc_func && !inc_file)
1069 inc_notype = inc_object = inc_func = inc_file = true;
1070 if (!inc_local && !inc_global && !inc_weak)
1071 inc_local = inc_global = inc_weak = true;
1072 if (!inc_def && !inc_undef && !inc_abs && !inc_common)
1073 inc_def = inc_undef = inc_abs = inc_common = true;
1074
1075 /* backwards compat for defined/undefined short hand */
1076 } else if (*this_sym == '+') {
1077 inc_undef = false;
1078 ++this_sym;
1079 } else if (*this_sym == '-') {
1080 inc_def = inc_abs = inc_common = false;
1081 ++this_sym;
1082 }
1083
1084 /* filter symbols */
1085 if ((!inc_notype && stt == STT_NOTYPE) || \
1086 (!inc_object && stt == STT_OBJECT) || \
1087 (!inc_func && stt == STT_FUNC ) || \
1088 (!inc_file && stt == STT_FILE ) || \
1089 (!inc_local && stb == STB_LOCAL ) || \
1090 (!inc_global && stb == STB_GLOBAL) || \
1091 (!inc_weak && stb == STB_WEAK ) || \
1092 (!inc_def && shn && shn < SHN_LORESERVE) || \
1093 (!inc_undef && shn == SHN_UNDEF ) || \
1094 (!inc_abs && shn == SHN_ABS ) || \
1095 (!inc_common && shn == SHN_COMMON))
1096 continue;
1097
1098 if (*this_sym == '*') {
1099 /* a "*" symbol gets you debug output */
1100 printf("%s(%s) %5lX %15s %15s %15s %s\n",
1101 ((*found_sym == 0) ? "\n\t" : "\t"),
1102 elf->base_filename,
1103 size,
1104 get_elfstttype(stt),
1105 get_elfstbtype(stb),
1106 get_elfshntype(shn),
1107 symname);
1108 goto matched;
1109
1110 } else {
1111 if (g_match) {
1112 /* regex match the symbol */
1113 if (rematch(this_sym, symname, REG_EXTENDED) != 0)
1114 continue;
1115
1116 } else if (*this_sym) {
1117 /* give empty symbols a "pass", else do a normal compare */
1118 const size_t len = strlen(this_sym);
1119 if (!(strncmp(this_sym, symname, len) == 0 &&
1120 /* Accept unversioned symbol names */
1121 (symname[len] == '\0' || symname[len] == '@')))
1122 continue;
1123 }
1124
1125 if (be_semi_verbose) {
1126 char buf[1024];
1127 snprintf(buf, sizeof(buf), "%lX %s %s",
1128 size,
1129 get_elfstttype(stt),
1130 this_sym);
1131 *ret = xstrdup(buf);
1132 } else {
1133 if (*ret) xchrcat(ret, ',', ret_len);
1134 xstrcat(ret, symname, ret_len);
1135 }
1136
1137 goto matched;
1138 }
1139 } while (next_sym);
1140
1141 return;
1142
1143 matched:
1144 *found_sym = 1;
1145 if (next_sym)
1146 next_sym[-1] = saved;
1147 }
1148
1149 static char *scanelf_file_sym(elfobj *elf, char *found_sym)
1150 {
1151 unsigned long i;
1152 char *ret;
1153 void *symtab_void, *strtab_void;
1154
1155 if (!find_sym) return NULL;
1156 ret = NULL;
1157
1158 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
1159
1160 if (symtab_void && strtab_void) {
1161 #define FIND_SYM(B) \
1162 if (elf->elf_class == ELFCLASS ## B) { \
1163 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
1164 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
1165 Elf ## B ## _Sym *sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
1166 unsigned long cnt = EGET(symtab->sh_entsize); \
1167 char *symname; \
1168 size_t ret_len = 0; \
1169 if (cnt) \
1170 cnt = EGET(symtab->sh_size) / cnt; \
1171 for (i = 0; i < cnt; ++i) { \
1172 if ((void*)sym > elf->data_end) { \
1173 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1174 goto break_out; \
1175 } \
1176 if (sym->st_name) { \
1177 /* make sure the symbol name is in acceptable memory range */ \
1178 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
1179 if ((void*)symname > elf->data_end) { \
1180 warnf("%s: corrupt ELF symbols", elf->filename); \
1181 ++sym; \
1182 continue; \
1183 } \
1184 scanelf_match_symname(elf, found_sym, \
1185 &ret, &ret_len, symname, \
1186 ELF##B##_ST_TYPE(EGET(sym->st_info)), \
1187 ELF##B##_ST_BIND(EGET(sym->st_info)), \
1188 EGET(sym->st_shndx), \
1189 /* st_size can be 64bit, but no one is really that big, so screw em */ \
1190 EGET(sym->st_size)); \
1191 } \
1192 ++sym; \
1193 } }
1194 FIND_SYM(32)
1195 FIND_SYM(64)
1196 }
1197
1198 break_out:
1199 if (be_wewy_wewy_quiet) return NULL;
1200
1201 if (*find_sym != '*' && *found_sym)
1202 return ret;
1203 if (be_quiet)
1204 return NULL;
1205 else
1206 return (char *)" - ";
1207 }
1208
1209 static char *scanelf_file_sections(elfobj *elf, char *found_section)
1210 {
1211 if (!find_section)
1212 return NULL;
1213
1214 #define FIND_SECTION(B) \
1215 if (elf->elf_class == ELFCLASS ## B) { \
1216 int invert; \
1217 Elf ## B ## _Shdr *section; \
1218 invert = (*find_section == '!' ? 1 : 0); \
1219 section = SHDR ## B (elf_findsecbyname(elf, find_section+invert)); \
1220 if ((section == NULL && invert) || (section != NULL && !invert)) \
1221 *found_section = 1; \
1222 }
1223 FIND_SECTION(32)
1224 FIND_SECTION(64)
1225
1226 if (be_wewy_wewy_quiet)
1227 return NULL;
1228
1229 if (*found_section)
1230 return find_section;
1231
1232 if (be_quiet)
1233 return NULL;
1234 else
1235 return (char *)" - ";
1236 }
1237
1238 /* scan an elf file and show all the fun stuff */
1239 #define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
1240 static int scanelf_elfobj(elfobj *elf)
1241 {
1242 unsigned long i;
1243 char found_pax, found_phdr, found_relro, found_load, found_textrel,
1244 found_rpath, found_needed, found_interp, found_bind, found_soname,
1245 found_sym, found_lib, found_file, found_textrels, found_section;
1246 static char *out_buffer = NULL;
1247 static size_t out_len;
1248
1249 found_pax = found_phdr = found_relro = found_load = found_textrel = \
1250 found_rpath = found_needed = found_interp = found_bind = found_soname = \
1251 found_sym = found_lib = found_file = found_textrels = found_section = 0;
1252
1253 if (be_verbose > 2)
1254 printf("%s: scanning file {%s,%s}\n", elf->filename,
1255 get_elfeitype(EI_CLASS, elf->elf_class),
1256 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
1257 else if (be_verbose > 1)
1258 printf("%s: scanning file\n", elf->filename);
1259
1260 /* init output buffer */
1261 if (!out_buffer) {
1262 out_len = sizeof(char) * 80;
1263 out_buffer = xmalloc(out_len);
1264 }
1265 *out_buffer = '\0';
1266
1267 /* show the header */
1268 if (!be_quiet && show_banner) {
1269 for (i = 0; out_format[i]; ++i) {
1270 if (!IS_MODIFIER(out_format[i])) continue;
1271
1272 switch (out_format[++i]) {
1273 case '+': break;
1274 case '%': break;
1275 case '#': break;
1276 case 'F':
1277 case 'p':
1278 case 'f': prints("FILE "); found_file = 1; break;
1279 case 'o': prints(" TYPE "); break;
1280 case 'x': prints(" PAX "); break;
1281 case 'e': prints("STK/REL/PTL "); break;
1282 case 't': prints("TEXTREL "); break;
1283 case 'r': prints("RPATH "); break;
1284 case 'M': prints("CLASS "); break;
1285 case 'n': prints("NEEDED "); break;
1286 case 'i': prints("INTERP "); break;
1287 case 'b': prints("BIND "); break;
1288 case 'Z': prints("SIZE "); break;
1289 case 'S': prints("SONAME "); break;
1290 case 's': prints("SYM "); break;
1291 case 'N': prints("LIB "); break;
1292 case 'T': prints("TEXTRELS "); break;
1293 case 'k': prints("SECTION "); break;
1294 case 'a': prints("ARCH "); break;
1295 case 'I': prints("OSABI "); break;
1296 case 'Y': prints("EABI "); break;
1297 case 'O': prints("PERM "); break;
1298 case 'D': prints("ENDIAN "); break;
1299 default: warnf("'%c' has no title ?", out_format[i]);
1300 }
1301 }
1302 if (!found_file) prints("FILE ");
1303 prints("\n");
1304 found_file = 0;
1305 show_banner = 0;
1306 }
1307
1308 /* dump all the good stuff */
1309 for (i = 0; out_format[i]; ++i) {
1310 const char *out;
1311 const char *tmp;
1312 static char ubuf[sizeof(unsigned long)*2];
1313 if (!IS_MODIFIER(out_format[i])) {
1314 xchrcat(&out_buffer, out_format[i], &out_len);
1315 continue;
1316 }
1317
1318 out = NULL;
1319 be_wewy_wewy_quiet = (out_format[i] == '#');
1320 be_semi_verbose = (out_format[i] == '+');
1321 switch (out_format[++i]) {
1322 case '+':
1323 case '%':
1324 case '#':
1325 xchrcat(&out_buffer, out_format[i], &out_len); break;
1326 case 'F':
1327 found_file = 1;
1328 if (be_wewy_wewy_quiet) break;
1329 xstrcat(&out_buffer, elf->filename, &out_len);
1330 break;
1331 case 'p':
1332 found_file = 1;
1333 if (be_wewy_wewy_quiet) break;
1334 tmp = elf->filename;
1335 if (search_path) {
1336 ssize_t len_search = strlen(search_path);
1337 ssize_t len_file = strlen(elf->filename);
1338 if (!strncmp(elf->filename, search_path, len_search) && \
1339 len_file > len_search)
1340 tmp += len_search;
1341 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1342 }
1343 xstrcat(&out_buffer, tmp, &out_len);
1344 break;
1345 case 'f':
1346 found_file = 1;
1347 if (be_wewy_wewy_quiet) break;
1348 tmp = strrchr(elf->filename, '/');
1349 tmp = (tmp == NULL ? elf->filename : tmp+1);
1350 xstrcat(&out_buffer, tmp, &out_len);
1351 break;
1352 case 'o': out = get_elfetype(elf); break;
1353 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
1354 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
1355 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1356 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
1357 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1358 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1359 case 'D': out = get_endian(elf); break;
1360 case 'O': out = strfileperms(elf->filename); break;
1361 case 'n':
1362 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
1363 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1364 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1365 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
1366 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1367 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1368 case 'a': out = get_elfemtype(elf); break;
1369 case 'I': out = get_elfosabi(elf); break;
1370 case 'Y': out = get_elf_eabi(elf); break;
1371 case 'Z': snprintf(ubuf, sizeof(ubuf), "%lu", (unsigned long)elf->len); out = ubuf; break;;
1372 default: warnf("'%c' has no scan code?", out_format[i]);
1373 }
1374 if (out)
1375 xstrcat(&out_buffer, out, &out_len);
1376 }
1377
1378 #define FOUND_SOMETHING() \
1379 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1380 found_rpath || found_needed || found_interp || found_bind || \
1381 found_soname || found_sym || found_lib || found_textrels || found_section )
1382
1383 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1384 xchrcat(&out_buffer, ' ', &out_len);
1385 xstrcat(&out_buffer, elf->filename, &out_len);
1386 }
1387 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
1388 puts(out_buffer);
1389 fflush(stdout);
1390 }
1391
1392 return 0;
1393 }
1394
1395 /* scan a single elf */
1396 static int scanelf_elf(const char *filename, int fd, size_t len)
1397 {
1398 int ret = 1;
1399 elfobj *elf;
1400
1401 /* verify this is real ELF */
1402 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1403 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1404 return ret;
1405 }
1406 switch (match_bits) {
1407 case 32:
1408 if (elf->elf_class != ELFCLASS32)
1409 goto label_done;
1410 break;
1411 case 64:
1412 if (elf->elf_class != ELFCLASS64)
1413 goto label_done;
1414 break;
1415 default: break;
1416 }
1417 if (strlen(match_etypes)) {
1418 char sbuf[126];
1419 strncpy(sbuf, match_etypes, sizeof(sbuf));
1420 if (strchr(match_etypes, ',') != NULL) {
1421 char *p;
1422 while ((p = strrchr(sbuf, ',')) != NULL) {
1423 *p = 0;
1424 if (etype_lookup(p+1) == get_etype(elf))
1425 goto label_ret;
1426 }
1427 }
1428 if (etype_lookup(sbuf) != get_etype(elf))
1429 goto label_done;
1430 }
1431
1432 label_ret:
1433 ret = scanelf_elfobj(elf);
1434
1435 label_done:
1436 unreadelf(elf);
1437 return ret;
1438 }
1439
1440 /* scan an archive of elfs */
1441 static int scanelf_archive(const char *filename, int fd, size_t len)
1442 {
1443 archive_handle *ar;
1444 archive_member *m;
1445 char *ar_buffer;
1446 elfobj *elf;
1447
1448 ar = ar_open_fd(filename, fd);
1449 if (ar == NULL)
1450 return 1;
1451
1452 ar_buffer = mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1453 while ((m = ar_next(ar)) != NULL) {
1454 off_t cur_pos = lseek(fd, 0, SEEK_CUR);
1455 if (cur_pos == -1)
1456 errp("lseek() failed");
1457 elf = readelf_buffer(m->name, ar_buffer + cur_pos, m->size);
1458 if (elf) {
1459 scanelf_elfobj(elf);
1460 unreadelf(elf);
1461 }
1462 }
1463 munmap(ar_buffer, len);
1464
1465 return 0;
1466 }
1467 /* scan a file which may be an elf or an archive or some other magical beast */
1468 static int scanelf_file(const char *filename, const struct stat *st_cache)
1469 {
1470 const struct stat *st = st_cache;
1471 struct stat symlink_st;
1472 int fd;
1473
1474 /* always handle regular files and handle symlinked files if no -y */
1475 if (S_ISLNK(st->st_mode)) {
1476 if (!scan_symlink) return 1;
1477 stat(filename, &symlink_st);
1478 st = &symlink_st;
1479 }
1480
1481 if (!S_ISREG(st->st_mode)) {
1482 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1483 return 1;
1484 }
1485
1486 if (match_perms) {
1487 if ((st->st_mode | match_perms) != st->st_mode)
1488 return 1;
1489 }
1490 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1491 return 1;
1492
1493 if (scanelf_elf(filename, fd, st->st_size) == 1 && scan_archives)
1494 /* if it isn't an ELF, maybe it's an .a archive */
1495 scanelf_archive(filename, fd, st->st_size);
1496
1497 close(fd);
1498 return 0;
1499 }
1500
1501 static const char *maybe_add_root(const char *fname, char *buf)
1502 {
1503 if (root && strncmp(fname, root, strlen(root))) {
1504 strcpy(buf, root);
1505 strncat(buf, fname, __PAX_UTILS_PATH_MAX - strlen(root) - 1);
1506 fname = buf;
1507 }
1508 return fname;
1509 }
1510
1511 /* scan a directory for ET_EXEC files and print when we find one */
1512 static int scanelf_dir(const char *path)
1513 {
1514 register DIR *dir;
1515 register struct dirent *dentry;
1516 struct stat st_top, st;
1517 char buf[__PAX_UTILS_PATH_MAX];
1518 char _path[__PAX_UTILS_PATH_MAX];
1519 size_t pathlen = 0, len = 0;
1520 int ret = 0;
1521
1522 path = maybe_add_root(path, _path);
1523
1524 /* make sure path exists */
1525 if (lstat(path, &st_top) == -1) {
1526 if (be_verbose > 2) printf("%s: does not exist\n", path);
1527 return 1;
1528 }
1529
1530 /* ok, if it isn't a directory, assume we can open it */
1531 if (!S_ISDIR(st_top.st_mode)) {
1532 return scanelf_file(path, &st_top);
1533 }
1534
1535 /* now scan the dir looking for fun stuff */
1536 if ((dir = opendir(path)) == NULL) {
1537 warnf("could not opendir %s: %s", path, strerror(errno));
1538 return 1;
1539 }
1540 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1541
1542 pathlen = strlen(path);
1543 while ((dentry = readdir(dir))) {
1544 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1545 continue;
1546 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
1547 if (len >= sizeof(buf)) {
1548 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1549 (unsigned long)len, (unsigned long)sizeof(buf));
1550 continue;
1551 }
1552 snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name);
1553 if (lstat(buf, &st) != -1) {
1554 if (S_ISREG(st.st_mode))
1555 ret = scanelf_file(buf, &st);
1556 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1557 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1558 ret = scanelf_dir(buf);
1559 }
1560 }
1561 }
1562 closedir(dir);
1563 return ret;
1564 }
1565
1566 static int scanelf_from_file(const char *filename)
1567 {
1568 FILE *fp = NULL;
1569 char *p;
1570 char path[__PAX_UTILS_PATH_MAX];
1571 int ret = 0;
1572
1573 if (strcmp(filename, "-") == 0)
1574 fp = stdin;
1575 else if ((fp = fopen(filename, "r")) == NULL)
1576 return 1;
1577
1578 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1579 if ((p = strchr(path, '\n')) != NULL)
1580 *p = 0;
1581 search_path = path;
1582 ret = scanelf_dir(path);
1583 }
1584 if (fp != stdin)
1585 fclose(fp);
1586 return ret;
1587 }
1588
1589 #if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1590
1591 static int load_ld_cache_config(int i, const char *fname)
1592 {
1593 FILE *fp = NULL;
1594 char *p;
1595 char path[__PAX_UTILS_PATH_MAX];
1596 char _fname[__PAX_UTILS_PATH_MAX];
1597
1598 fname = maybe_add_root(fname, _fname);
1599
1600 if (i + 1 == ARRAY_SIZE(ldpaths))
1601 return i;
1602
1603 if ((fp = fopen(fname, "r")) == NULL)
1604 return i;
1605
1606 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1607 if ((p = strrchr(path, '\r')) != NULL)
1608 *p = 0;
1609 if ((p = strchr(path, '\n')) != NULL)
1610 *p = 0;
1611
1612 /* recursive includes of the same file will make this segfault. */
1613 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1614 glob_t gl;
1615 size_t x;
1616 char gpath[__PAX_UTILS_PATH_MAX];
1617
1618 memset(gpath, 0, sizeof(gpath));
1619 if (root)
1620 strcpy(gpath, root);
1621
1622 if (path[8] != '/')
1623 snprintf(gpath+strlen(gpath), sizeof(gpath)-strlen(gpath), "/etc/%s", &path[8]);
1624 else
1625 strncpy(gpath+strlen(gpath), &path[8], sizeof(gpath)-strlen(gpath));
1626
1627 if (glob(gpath, 0, NULL, &gl) == 0) {
1628 for (x = 0; x < gl.gl_pathc; ++x) {
1629 /* try to avoid direct loops */
1630 if (strcmp(gl.gl_pathv[x], fname) == 0)
1631 continue;
1632 i = load_ld_cache_config(i, gl.gl_pathv[x]);
1633 if (i + 1 >= ARRAY_SIZE(ldpaths)) {
1634 globfree(&gl);
1635 return i;
1636 }
1637 }
1638 globfree(&gl);
1639 continue;
1640 }
1641 }
1642
1643 if (*path != '/')
1644 continue;
1645
1646 ldpaths[i++] = xstrdup(path);
1647
1648 if (i + 1 == ARRAY_SIZE(ldpaths))
1649 break;
1650 }
1651 ldpaths[i] = NULL;
1652
1653 fclose(fp);
1654 return i;
1655 }
1656
1657 #elif defined(__FreeBSD__) || defined(__DragonFly__)
1658
1659 static int load_ld_cache_config(int i, const char *fname)
1660 {
1661 FILE *fp = NULL;
1662 char *b = NULL, *p;
1663 struct elfhints_hdr hdr;
1664 char _fname[__PAX_UTILS_PATH_MAX];
1665
1666 fname = maybe_add_root(fname, _fname);
1667
1668 if (i + 1 == ARRAY_SIZE(ldpaths))
1669 return i;
1670
1671 if ((fp = fopen(fname, "r")) == NULL)
1672 return i;
1673
1674 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1675 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1676 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1677 {
1678 fclose(fp);
1679 return i;
1680 }
1681
1682 b = xmalloc(hdr.dirlistlen + 1);
1683 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1684 fclose(fp);
1685 free(b);
1686 return i;
1687 }
1688
1689 while ((p = strsep(&b, ":"))) {
1690 if (*p == '\0') continue;
1691 ldpaths[i++] = xstrdup(p);
1692
1693 if (i + 1 == ARRAY_SIZE(ldpaths))
1694 break;
1695 }
1696 ldpaths[i] = NULL;
1697
1698 free(b);
1699 fclose(fp);
1700 return i;
1701 }
1702
1703 #else
1704 #ifdef __ELF__
1705 #warning Cache config support not implemented for your target
1706 #endif
1707 static int load_ld_cache_config(int i, const char *fname)
1708 {
1709 memset(ldpaths, 0x00, sizeof(ldpaths));
1710 return 0;
1711 }
1712 #endif
1713
1714 /* scan /etc/ld.so.conf for paths */
1715 static void scanelf_ldpath(void)
1716 {
1717 char scan_l, scan_ul, scan_ull;
1718 int i = 0;
1719
1720 if (!ldpaths[0])
1721 err("Unable to load any paths from ld.so.conf");
1722
1723 scan_l = scan_ul = scan_ull = 0;
1724
1725 while (ldpaths[i]) {
1726 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
1727 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
1728 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
1729 scanelf_dir(ldpaths[i]);
1730 ++i;
1731 }
1732
1733 if (!scan_l) scanelf_dir("/lib");
1734 if (!scan_ul) scanelf_dir("/usr/lib");
1735 if (!scan_ull) scanelf_dir("/usr/local/lib");
1736 }
1737
1738 /* scan env PATH for paths */
1739 static void scanelf_envpath(void)
1740 {
1741 char *path, *p;
1742
1743 path = getenv("PATH");
1744 if (!path)
1745 err("PATH is not set in your env !");
1746 path = xstrdup(path);
1747
1748 while ((p = strrchr(path, ':')) != NULL) {
1749 scanelf_dir(p + 1);
1750 *p = 0;
1751 }
1752
1753 free(path);
1754 }
1755
1756 /* usage / invocation handling functions */ /* Free Flags: c d j u w G H J K P Q U W */
1757 #define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZCBhV"
1758 #define a_argument required_argument
1759 static struct option const long_opts[] = {
1760 {"path", no_argument, NULL, 'p'},
1761 {"ldpath", no_argument, NULL, 'l'},
1762 {"root", a_argument, NULL, 128},
1763 {"recursive", no_argument, NULL, 'R'},
1764 {"mount", no_argument, NULL, 'm'},
1765 {"symlink", no_argument, NULL, 'y'},
1766 {"archives", no_argument, NULL, 'A'},
1767 {"ldcache", no_argument, NULL, 'L'},
1768 {"fix", no_argument, NULL, 'X'},
1769 {"setpax", a_argument, NULL, 'z'},
1770 {"pax", no_argument, NULL, 'x'},
1771 {"header", no_argument, NULL, 'e'},
1772 {"textrel", no_argument, NULL, 't'},
1773 {"rpath", no_argument, NULL, 'r'},
1774 {"needed", no_argument, NULL, 'n'},
1775 {"interp", no_argument, NULL, 'i'},
1776 {"bind", no_argument, NULL, 'b'},
1777 {"soname", no_argument, NULL, 'S'},
1778 {"symbol", a_argument, NULL, 's'},
1779 {"section", a_argument, NULL, 'k'},
1780 {"lib", a_argument, NULL, 'N'},
1781 {"gmatch", no_argument, NULL, 'g'},
1782 {"textrels", no_argument, NULL, 'T'},
1783 {"etype", a_argument, NULL, 'E'},
1784 {"bits", a_argument, NULL, 'M'},
1785 {"endian", no_argument, NULL, 'D'},
1786 {"osabi", no_argument, NULL, 'I'},
1787 {"eabi", no_argument, NULL, 'Y'},
1788 {"perms", a_argument, NULL, 'O'},
1789 {"size", no_argument, NULL, 'Z'},
1790 {"all", no_argument, NULL, 'a'},
1791 {"quiet", no_argument, NULL, 'q'},
1792 {"verbose", no_argument, NULL, 'v'},
1793 {"format", a_argument, NULL, 'F'},
1794 {"from", a_argument, NULL, 'f'},
1795 {"file", a_argument, NULL, 'o'},
1796 {"nocolor", no_argument, NULL, 'C'},
1797 {"nobanner", no_argument, NULL, 'B'},
1798 {"help", no_argument, NULL, 'h'},
1799 {"version", no_argument, NULL, 'V'},
1800 {NULL, no_argument, NULL, 0x0}
1801 };
1802
1803 static const char * const opts_help[] = {
1804 "Scan all directories in PATH environment",
1805 "Scan all directories in /etc/ld.so.conf",
1806 "Root directory (use with -l or -p)",
1807 "Scan directories recursively",
1808 "Don't recursively cross mount points",
1809 "Don't scan symlinks",
1810 "Scan archives (.a files)",
1811 "Utilize ld.so.cache information (use with -r/-n)",
1812 "Try and 'fix' bad things (use with -r/-e)",
1813 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1814 "Print PaX markings",
1815 "Print GNU_STACK/PT_LOAD markings",
1816 "Print TEXTREL information",
1817 "Print RPATH information",
1818 "Print NEEDED information",
1819 "Print INTERP information",
1820 "Print BIND information",
1821 "Print SONAME information",
1822 "Find a specified symbol",
1823 "Find a specified section",
1824 "Find a specified library",
1825 "Use strncmp to match libraries. (use with -N)",
1826 "Locate cause of TEXTREL",
1827 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1828 "Print only ELF files matching numeric bits",
1829 "Print Endianness",
1830 "Print OSABI",
1831 "Print EABI (EM_ARM Only)",
1832 "Print only ELF files matching octal permissions",
1833 "Print ELF file size",
1834 "Print all useful/simple info\n",
1835 "Only output 'bad' things",
1836 "Be verbose (can be specified more than once)",
1837 "Use specified format for output",
1838 "Read input stream from a filename",
1839 "Write output stream to a filename",
1840 "Don't emit color in output",
1841 "Don't display the header",
1842 "Print this help and exit",
1843 "Print version and exit",
1844 NULL
1845 };
1846
1847 /* display usage and exit */
1848 static void usage(int status)
1849 {
1850 unsigned long i;
1851 printf("* Scan ELF binaries for stuff\n\n"
1852 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1853 printf("Options: -[%s]\n", PARSE_FLAGS);
1854 for (i = 0; long_opts[i].name; ++i)
1855 if (long_opts[i].has_arg == no_argument)
1856 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
1857 long_opts[i].name, opts_help[i]);
1858 else if (long_opts[i].val > '~')
1859 printf(" --%-7s <arg> * %s\n",
1860 long_opts[i].name, opts_help[i]);
1861 else
1862 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
1863 long_opts[i].name, opts_help[i]);
1864
1865 puts("\nFor more information, see the scanelf(1) manpage");
1866 exit(status);
1867 }
1868
1869 /* parse command line arguments and preform needed actions */
1870 #define do_pax_state(option, flag) \
1871 if (islower(option)) { \
1872 flags &= ~PF_##flag; \
1873 flags |= PF_NO##flag; \
1874 } else { \
1875 flags &= ~PF_NO##flag; \
1876 flags |= PF_##flag; \
1877 }
1878 static int parseargs(int argc, char *argv[])
1879 {
1880 int i;
1881 const char *from_file = NULL;
1882 int ret = 0;
1883
1884 opterr = 0;
1885 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1886 switch (i) {
1887
1888 case 'V':
1889 printf("pax-utils-%s: %s compiled %s\n%s\n"
1890 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
1891 VERSION, __FILE__, __DATE__, rcsid, argv0);
1892 exit(EXIT_SUCCESS);
1893 break;
1894 case 'h': usage(EXIT_SUCCESS); break;
1895 case 'f':
1896 if (from_file) warn("You prob don't want to specify -f twice");
1897 from_file = optarg;
1898 break;
1899 case 'E':
1900 strncpy(match_etypes, optarg, sizeof(match_etypes));
1901 break;
1902 case 'M':
1903 match_bits = atoi(optarg);
1904 if (match_bits == 0) {
1905 if (strcmp(optarg, "ELFCLASS32") == 0)
1906 match_bits = 32;
1907 if (strcmp(optarg, "ELFCLASS64") == 0)
1908 match_bits = 64;
1909 }
1910 break;
1911 case 'O':
1912 if (sscanf(optarg, "%o", &match_perms) == -1)
1913 match_bits = 0;
1914 break;
1915 case 'o': {
1916 if (freopen(optarg, "w", stdout) == NULL)
1917 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1918 break;
1919 }
1920 case 'k':
1921 if (find_section) warn("You prob don't want to specify -k twice");
1922 find_section = optarg;
1923 break;
1924 case 's': {
1925 if (find_sym) warn("You prob don't want to specify -s twice");
1926 find_sym = optarg;
1927 break;
1928 }
1929 case 'N': {
1930 if (find_lib) warn("You prob don't want to specify -N twice");
1931 find_lib = optarg;
1932 break;
1933 }
1934
1935 case 'F': {
1936 if (out_format) warn("You prob don't want to specify -F twice");
1937 out_format = optarg;
1938 break;
1939 }
1940 case 'z': {
1941 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1942 size_t x;
1943
1944 for (x = 0; x < strlen(optarg); x++) {
1945 switch (optarg[x]) {
1946 case 'p':
1947 case 'P':
1948 do_pax_state(optarg[x], PAGEEXEC);
1949 break;
1950 case 's':
1951 case 'S':
1952 do_pax_state(optarg[x], SEGMEXEC);
1953 break;
1954 case 'm':
1955 case 'M':
1956 do_pax_state(optarg[x], MPROTECT);
1957 break;
1958 case 'e':
1959 case 'E':
1960 do_pax_state(optarg[x], EMUTRAMP);
1961 break;
1962 case 'r':
1963 case 'R':
1964 do_pax_state(optarg[x], RANDMMAP);
1965 break;
1966 case 'x':
1967 case 'X':
1968 do_pax_state(optarg[x], RANDEXEC);
1969 break;
1970 default:
1971 break;
1972 }
1973 }
1974 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
1975 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
1976 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
1977 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
1978 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1979 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1980 setpax = flags;
1981 break;
1982 }
1983 case 'Z': show_size = 1; break;
1984 case 'g': g_match = 1; break;
1985 case 'L': use_ldcache = 1; break;
1986 case 'y': scan_symlink = 0; break;
1987 case 'A': scan_archives = 1; break;
1988 case 'C': color_init(true); break;
1989 case 'B': show_banner = 0; break;
1990 case 'l': scan_ldpath = 1; break;
1991 case 'p': scan_envpath = 1; break;
1992 case 'R': dir_recurse = 1; break;
1993 case 'm': dir_crossmount = 0; break;
1994 case 'X': ++fix_elf; break;
1995 case 'x': show_pax = 1; break;
1996 case 'e': show_phdr = 1; break;
1997 case 't': show_textrel = 1; break;
1998 case 'r': show_rpath = 1; break;
1999 case 'n': show_needed = 1; break;
2000 case 'i': show_interp = 1; break;
2001 case 'b': show_bind = 1; break;
2002 case 'S': show_soname = 1; break;
2003 case 'T': show_textrels = 1; break;
2004 case 'q': be_quiet = 1; break;
2005 case 'v': be_verbose = (be_verbose % 20) + 1; break;
2006 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
2007 case 'D': show_endian = 1; break;
2008 case 'I': show_osabi = 1; break;
2009 case 'Y': show_eabi = 1; break;
2010 case 128:
2011 root = optarg;
2012 break;
2013 case ':':
2014 err("Option '%c' is missing parameter", optopt);
2015 case '?':
2016 err("Unknown option '%c' or argument missing", optopt);
2017 default:
2018 err("Unhandled option '%c'; please report this", i);
2019 }
2020 }
2021 if (show_textrels && be_verbose) {
2022 if (which("objdump") != NULL)
2023 has_objdump = 1;
2024 }
2025 /* let the format option override all other options */
2026 if (out_format) {
2027 show_pax = show_phdr = show_textrel = show_rpath = \
2028 show_needed = show_interp = show_bind = show_soname = \
2029 show_textrels = show_perms = show_endian = show_size = \
2030 show_osabi = show_eabi = 0;
2031 for (i = 0; out_format[i]; ++i) {
2032 if (!IS_MODIFIER(out_format[i])) continue;
2033
2034 switch (out_format[++i]) {
2035 case '+': break;
2036 case '%': break;
2037 case '#': break;
2038 case 'F': break;
2039 case 'p': break;
2040 case 'f': break;
2041 case 'k': break;
2042 case 's': break;
2043 case 'N': break;
2044 case 'o': break;
2045 case 'a': break;
2046 case 'M': break;
2047 case 'Z': show_size = 1; break;
2048 case 'D': show_endian = 1; break;
2049 case 'I': show_osabi = 1; break;
2050 case 'Y': show_eabi = 1; break;
2051 case 'O': show_perms = 1; break;
2052 case 'x': show_pax = 1; break;
2053 case 'e': show_phdr = 1; break;
2054 case 't': show_textrel = 1; break;
2055 case 'r': show_rpath = 1; break;
2056 case 'n': show_needed = 1; break;
2057 case 'i': show_interp = 1; break;
2058 case 'b': show_bind = 1; break;
2059 case 'S': show_soname = 1; break;
2060 case 'T': show_textrels = 1; break;
2061 default:
2062 err("Invalid format specifier '%c' (byte %i)",
2063 out_format[i], i+1);
2064 }
2065 }
2066
2067 /* construct our default format */
2068 } else {
2069 size_t fmt_len = 30;
2070 out_format = xmalloc(sizeof(char) * fmt_len);
2071 *out_format = '\0';
2072 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
2073 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
2074 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
2075 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
2076 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
2077 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
2078 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
2079 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
2080 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
2081 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
2082 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
2083 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
2084 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
2085 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
2086 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
2087 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
2088 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
2089 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
2090 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
2091 }
2092 if (be_verbose > 2) printf("Format: %s\n", out_format);
2093
2094 /* now lets actually do the scanning */
2095 if (scan_ldpath || use_ldcache)
2096 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
2097 if (scan_ldpath) scanelf_ldpath();
2098 if (scan_envpath) scanelf_envpath();
2099 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
2100 from_file = "-";
2101 if (from_file) {
2102 scanelf_from_file(from_file);
2103 from_file = *argv;
2104 }
2105 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
2106 err("Nothing to scan !?");
2107 while (optind < argc) {
2108 search_path = argv[optind++];
2109 ret = scanelf_dir(search_path);
2110 }
2111
2112 /* clean up */
2113 for (i = 0; ldpaths[i]; ++i)
2114 free(ldpaths[i]);
2115
2116 if (ldcache != 0)
2117 munmap(ldcache, ldcache_size);
2118 return ret;
2119 }
2120
2121 static char **get_split_env(const char *envvar)
2122 {
2123 const char *delims = " \t\n";
2124 char **envvals = NULL;
2125 char *env, *s;
2126 int nentry;
2127
2128 if ((env = getenv(envvar)) == NULL)
2129 return NULL;
2130
2131 env = xstrdup(env);
2132 if (env == NULL)
2133 return NULL;
2134
2135 s = strtok(env, delims);
2136 if (s == NULL) {
2137 free(env);
2138 return NULL;
2139 }
2140
2141 nentry = 0;
2142 while (s != NULL) {
2143 ++nentry;
2144 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
2145 envvals[nentry-1] = s;
2146 s = strtok(NULL, delims);
2147 }
2148 envvals[nentry] = NULL;
2149
2150 /* don't want to free(env) as it contains the memory that backs
2151 * the envvals array of strings */
2152 return envvals;
2153 }
2154
2155 static void parseenv(void)
2156 {
2157 color_init(false);
2158 qa_textrels = get_split_env("QA_TEXTRELS");
2159 qa_execstack = get_split_env("QA_EXECSTACK");
2160 qa_wx_load = get_split_env("QA_WX_LOAD");
2161 }
2162
2163 #ifdef __PAX_UTILS_CLEANUP
2164 static void cleanup(void)
2165 {
2166 free(out_format);
2167 free(qa_textrels);
2168 free(qa_execstack);
2169 free(qa_wx_load);
2170 }
2171 #endif
2172
2173 int main(int argc, char *argv[])
2174 {
2175 int ret;
2176 if (argc < 2)
2177 usage(EXIT_FAILURE);
2178 parseenv();
2179 ret = parseargs(argc, argv);
2180 fclose(stdout);
2181 #ifdef __PAX_UTILS_CLEANUP
2182 cleanup();
2183 warn("The calls to add/delete heap should be off:\n"
2184 "\t- 1 due to the out_buffer not being freed in scanelf_file()\n"
2185 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
2186 #endif
2187 return ret;
2188 }
2189
2190 /* Match filename against entries in matchlist, return TRUE
2191 * if the file is listed */
2192 static int file_matches_list(const char *filename, char **matchlist)
2193 {
2194 char **file;
2195 char *match;
2196 char buf[__PAX_UTILS_PATH_MAX];
2197
2198 if (matchlist == NULL)
2199 return 0;
2200
2201 for (file = matchlist; *file != NULL; file++) {
2202 if (search_path) {
2203 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2204 match = buf;
2205 } else {
2206 match = *file;
2207 }
2208 if (fnmatch(match, filename, 0) == 0)
2209 return 1;
2210 }
2211 return 0;
2212 }

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