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Revision 1.228 - (show annotations) (download) (as text)
Tue Sep 27 19:21:56 2011 UTC (3 years, 1 month ago) by vapier
Branch: MAIN
Changes since 1.227: +3 -3 lines
File MIME type: text/x-csrc
simplify match_etype logic

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 1.226 2011/09/27 18:37:22 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 1.226 2011/09/27 18:37:22 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 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 = NULL;
33 static array_t _ldpaths = array_init_decl, *ldpaths = &_ldpaths;
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 array_t _find_lib_arr = array_init_decl, *find_lib_arr = &_find_lib_arr;
62 static char *find_section = NULL;
63 static array_t _find_section_arr = array_init_decl, *find_section_arr = &_find_section_arr;
64 static char *out_format = NULL;
65 static char *search_path = NULL;
66 static char fix_elf = 0;
67 static char g_match = 0;
68 static char use_ldcache = 0;
69
70 static char **qa_textrels = NULL;
71 static char **qa_execstack = NULL;
72 static char **qa_wx_load = NULL;
73 static char *root;
74
75 static int match_bits = 0;
76 static unsigned int match_perms = 0;
77 static void *ldcache = NULL;
78 static size_t ldcache_size = 0;
79 static unsigned long setpax = 0UL;
80
81 static int has_objdump = 0;
82
83 /* find the path to a file by name */
84 static char *which(const char *fname)
85 {
86 static char fullpath[__PAX_UTILS_PATH_MAX];
87 char *path, *p;
88
89 path = getenv("PATH");
90 if (!path)
91 return NULL;
92
93 path = xstrdup(path);
94 while ((p = strrchr(path, ':')) != NULL) {
95 snprintf(fullpath, sizeof(fullpath), "%s/%s", p + 1, fname);
96 *p = 0;
97 if (access(fullpath, R_OK) != -1) {
98 free(path);
99 return fullpath;
100 }
101 }
102 free(path);
103 return NULL;
104 }
105
106 /* 1 on failure. 0 otherwise */
107 static int rematch(const char *regex, const char *match, int cflags)
108 {
109 regex_t preg;
110 int ret;
111
112 if ((match == NULL) || (regex == NULL))
113 return EXIT_FAILURE;
114
115 if ((ret = regcomp(&preg, regex, cflags))) {
116 char err[256];
117
118 if (regerror(ret, &preg, err, sizeof(err)))
119 fprintf(stderr, "regcomp failed: %s", err);
120 else
121 fprintf(stderr, "regcomp failed");
122
123 return EXIT_FAILURE;
124 }
125 ret = regexec(&preg, match, 0, NULL, 0);
126 regfree(&preg);
127
128 return ret;
129 }
130
131 /* sub-funcs for scanelf_file() */
132 static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
133 {
134 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
135
136 /* debug sections */
137 void *symtab = elf_findsecbyname(elf, ".symtab");
138 void *strtab = elf_findsecbyname(elf, ".strtab");
139 /* runtime sections */
140 void *dynsym = elf_findsecbyname(elf, ".dynsym");
141 void *dynstr = elf_findsecbyname(elf, ".dynstr");
142
143 #define GET_SYMTABS(B) \
144 if (elf->elf_class == ELFCLASS ## B) { \
145 if (symtab && dynsym) { \
146 Elf ## B ## _Shdr *esymtab = symtab; \
147 Elf ## B ## _Shdr *edynsym = dynsym; \
148 *sym = (EGET(esymtab->sh_size) > EGET(edynsym->sh_size)) ? symtab : dynsym; \
149 } else \
150 *sym = symtab ? symtab : dynsym; \
151 if (strtab && dynstr) { \
152 Elf ## B ## _Shdr *estrtab = strtab; \
153 Elf ## B ## _Shdr *edynstr = dynstr; \
154 *tab = (EGET(estrtab->sh_size) > EGET(edynstr->sh_size)) ? strtab : dynstr; \
155 } else \
156 *tab = strtab ? strtab : dynstr; \
157 }
158 GET_SYMTABS(32)
159 GET_SYMTABS(64)
160 }
161
162 static char *scanelf_file_pax(elfobj *elf, char *found_pax)
163 {
164 static char ret[7];
165 unsigned long i, shown;
166
167 if (!show_pax) return NULL;
168
169 shown = 0;
170 memset(&ret, 0, sizeof(ret));
171
172 if (elf->phdr) {
173 #define SHOW_PAX(B) \
174 if (elf->elf_class == ELFCLASS ## B) { \
175 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
176 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
177 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
178 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
179 continue; \
180 if (fix_elf && setpax) { \
181 /* set the paxctl flags */ \
182 ESET(phdr[i].p_flags, setpax); \
183 } \
184 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
185 continue; \
186 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
187 *found_pax = 1; \
188 ++shown; \
189 break; \
190 } \
191 }
192 SHOW_PAX(32)
193 SHOW_PAX(64)
194 }
195
196 if (fix_elf && setpax) {
197 /* set the chpax settings */
198 if (elf->elf_class == ELFCLASS32) {
199 if (EHDR32(elf->ehdr)->e_type == ET_DYN || EHDR32(elf->ehdr)->e_type == ET_EXEC)
200 ESET(EHDR32(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
201 } else {
202 if (EHDR64(elf->ehdr)->e_type == ET_DYN || EHDR64(elf->ehdr)->e_type == ET_EXEC)
203 ESET(EHDR64(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
204 }
205 }
206
207 /* fall back to EI_PAX if no PT_PAX was found */
208 if (!*ret) {
209 static char *paxflags;
210 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
211 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
212 *found_pax = 1;
213 return (be_wewy_wewy_quiet ? NULL : paxflags);
214 }
215 strncpy(ret, paxflags, sizeof(ret));
216 }
217
218 if (be_wewy_wewy_quiet || (be_quiet && !shown))
219 return NULL;
220 else
221 return ret;
222 }
223
224 static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
225 {
226 static char ret[12];
227 char *found;
228 unsigned long i, shown, multi_stack, multi_relro, multi_load;
229 int max_pt_load;
230
231 if (!show_phdr) return NULL;
232
233 memcpy(ret, "--- --- ---\0", 12);
234
235 shown = 0;
236 multi_stack = multi_relro = multi_load = 0;
237 max_pt_load = elf_max_pt_load(elf);
238
239 #define NOTE_GNU_STACK ".note.GNU-stack"
240 #define SHOW_PHDR(B) \
241 if (elf->elf_class == ELFCLASS ## B) { \
242 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
243 Elf ## B ## _Off offset; \
244 uint32_t flags, check_flags; \
245 if (elf->phdr != NULL) { \
246 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
247 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
248 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
249 if (multi_stack++) \
250 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
251 if (file_matches_list(elf->filename, qa_execstack)) \
252 continue; \
253 found = found_phdr; \
254 offset = 0; \
255 check_flags = PF_X; \
256 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
257 if (multi_relro++) \
258 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
259 found = found_relro; \
260 offset = 4; \
261 check_flags = PF_X; \
262 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
263 if (EGET(ehdr->e_type) == ET_DYN || EGET(ehdr->e_type) == ET_EXEC) \
264 if (multi_load++ > max_pt_load) \
265 warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
266 if (file_matches_list(elf->filename, qa_wx_load)) \
267 continue; \
268 found = found_load; \
269 offset = 8; \
270 check_flags = PF_W|PF_X; \
271 } else \
272 continue; \
273 flags = EGET(phdr[i].p_flags); \
274 if (be_quiet && ((flags & check_flags) != check_flags)) \
275 continue; \
276 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
277 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
278 ret[3] = ret[7] = '!'; \
279 flags = EGET(phdr[i].p_flags); \
280 } \
281 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
282 *found = 1; \
283 ++shown; \
284 } \
285 } else if (elf->shdr != NULL) { \
286 /* no program headers which means this is prob an object file */ \
287 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
288 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
289 char *str; \
290 if ((void*)strtbl > elf->data_end) \
291 goto skip_this_shdr##B; \
292 check_flags = SHF_WRITE|SHF_EXECINSTR; \
293 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
294 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
295 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
296 str = elf->data + offset; \
297 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
298 if (!strcmp(str, NOTE_GNU_STACK)) { \
299 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
300 flags = EGET(shdr[i].sh_flags); \
301 if (be_quiet && ((flags & check_flags) != check_flags)) \
302 continue; \
303 ++*found_phdr; \
304 shown = 1; \
305 if (flags & SHF_WRITE) ret[0] = 'W'; \
306 if (flags & SHF_ALLOC) ret[1] = 'A'; \
307 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
308 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
309 break; \
310 } \
311 } \
312 skip_this_shdr##B: \
313 if (!multi_stack) { \
314 if (file_matches_list(elf->filename, qa_execstack)) \
315 return NULL; \
316 *found_phdr = 1; \
317 shown = 1; \
318 memcpy(ret, "!WX", 3); \
319 } \
320 } \
321 }
322 SHOW_PHDR(32)
323 SHOW_PHDR(64)
324
325 if (be_wewy_wewy_quiet || (be_quiet && !shown))
326 return NULL;
327 else
328 return ret;
329 }
330
331 /*
332 * See if this ELF contains a DT_TEXTREL tag in any of its
333 * PT_DYNAMIC sections.
334 */
335 static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
336 {
337 static const char *ret = "TEXTREL";
338 unsigned long i;
339
340 if (!show_textrel && !show_textrels) return NULL;
341
342 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
343
344 if (elf->phdr) {
345 #define SHOW_TEXTREL(B) \
346 if (elf->elf_class == ELFCLASS ## B) { \
347 Elf ## B ## _Dyn *dyn; \
348 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
349 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
350 Elf ## B ## _Off offset; \
351 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
352 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
353 offset = EGET(phdr[i].p_offset); \
354 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
355 dyn = DYN ## B (elf->vdata + offset); \
356 while (EGET(dyn->d_tag) != DT_NULL) { \
357 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
358 *found_textrel = 1; \
359 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
360 return (be_wewy_wewy_quiet ? NULL : ret); \
361 } \
362 ++dyn; \
363 } \
364 } }
365 SHOW_TEXTREL(32)
366 SHOW_TEXTREL(64)
367 }
368
369 if (be_quiet || be_wewy_wewy_quiet)
370 return NULL;
371 else
372 return " - ";
373 }
374
375 /*
376 * Scan the .text section to see if there are any relocations in it.
377 * Should rewrite this to check PT_LOAD sections that are marked
378 * Executable rather than the section named '.text'.
379 */
380 static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
381 {
382 unsigned long s, r, rmax;
383 void *symtab_void, *strtab_void, *text_void;
384
385 if (!show_textrels) return NULL;
386
387 /* don't search for TEXTREL's if the ELF doesn't have any */
388 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
389 if (!*found_textrel) return NULL;
390
391 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
392 text_void = elf_findsecbyname(elf, ".text");
393
394 if (symtab_void && strtab_void && text_void && elf->shdr) {
395 #define SHOW_TEXTRELS(B) \
396 if (elf->elf_class == ELFCLASS ## B) { \
397 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
398 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
399 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
400 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
401 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
402 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
403 uint ## B ## _t memsz = EGET(text->sh_size); \
404 Elf ## B ## _Rel *rel; \
405 Elf ## B ## _Rela *rela; \
406 /* search the section headers for relocations */ \
407 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
408 uint32_t sh_type = EGET(shdr[s].sh_type); \
409 if (sh_type == SHT_REL) { \
410 rel = REL ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
411 rela = NULL; \
412 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
413 } else if (sh_type == SHT_RELA) { \
414 rel = NULL; \
415 rela = RELA ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
416 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
417 } else \
418 continue; \
419 /* now see if any of the relocs are in the .text */ \
420 for (r = 0; r < rmax; ++r) { \
421 unsigned long sym_max; \
422 Elf ## B ## _Addr offset_tmp; \
423 Elf ## B ## _Sym *func; \
424 Elf ## B ## _Sym *sym; \
425 Elf ## B ## _Addr r_offset; \
426 uint ## B ## _t r_info; \
427 if (sh_type == SHT_REL) { \
428 r_offset = EGET(rel[r].r_offset); \
429 r_info = EGET(rel[r].r_info); \
430 } else { \
431 r_offset = EGET(rela[r].r_offset); \
432 r_info = EGET(rela[r].r_info); \
433 } \
434 /* make sure this relocation is inside of the .text */ \
435 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
436 if (be_verbose <= 2) continue; \
437 } else \
438 *found_textrels = 1; \
439 /* locate this relocation symbol name */ \
440 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
441 if ((void*)sym > elf->data_end) { \
442 warn("%s: corrupt ELF symbol", elf->filename); \
443 continue; \
444 } \
445 sym_max = ELF ## B ## _R_SYM(r_info); \
446 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
447 sym += sym_max; \
448 else \
449 sym = NULL; \
450 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
451 /* show the raw details about this reloc */ \
452 printf(" %s: ", elf->base_filename); \
453 if (sym && sym->st_name) \
454 printf("%s", elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
455 else \
456 printf("(memory/data?)"); \
457 printf(" [0x%lX]", (unsigned long)r_offset); \
458 /* now try to find the closest symbol that this rel is probably in */ \
459 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
460 func = NULL; \
461 offset_tmp = 0; \
462 while (sym_max--) { \
463 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
464 func = sym; \
465 offset_tmp = EGET(sym->st_value); \
466 } \
467 ++sym; \
468 } \
469 printf(" in "); \
470 if (func && func->st_name) { \
471 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
472 if (r_offset > EGET(func->st_size)) \
473 printf("(optimized out: previous %s)", func_name); \
474 else \
475 printf("%s", func_name); \
476 } else \
477 printf("(optimized out)"); \
478 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
479 if (be_verbose && has_objdump) { \
480 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
481 char *sysbuf; \
482 size_t syslen; \
483 int sysret; \
484 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"; \
485 syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
486 sysbuf = xmalloc(syslen); \
487 if (end_addr < r_offset) \
488 /* not uncommon when things are optimized out */ \
489 end_addr = r_offset + 0x100; \
490 snprintf(sysbuf, syslen, sysfmt, \
491 (unsigned long)offset_tmp, \
492 (unsigned long)end_addr, \
493 elf->filename, \
494 (unsigned long)r_offset); \
495 fflush(stdout); \
496 sysret = system(sysbuf); \
497 fflush(stdout); \
498 free(sysbuf); \
499 } \
500 } \
501 } }
502 SHOW_TEXTRELS(32)
503 SHOW_TEXTRELS(64)
504 }
505 if (!*found_textrels)
506 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
507
508 return NULL;
509 }
510
511 static void rpath_security_checks(elfobj *, char *, const char *);
512 static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
513 {
514 struct stat st;
515 switch (*item) {
516 case '/': break;
517 case '.':
518 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
519 break;
520 case ':':
521 case '\0':
522 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
523 break;
524 case '$':
525 if (fstat(elf->fd, &st) != -1)
526 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
527 warnf("Security problem with %s='%s' in %s with mode set of %o",
528 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
529 break;
530 default:
531 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
532 break;
533 }
534 }
535 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
536 {
537 unsigned long i;
538 char *rpath, *runpath, **r;
539 void *strtbl_void;
540
541 if (!show_rpath) return;
542
543 strtbl_void = elf_findsecbyname(elf, ".dynstr");
544 rpath = runpath = NULL;
545
546 if (elf->phdr && strtbl_void) {
547 #define SHOW_RPATH(B) \
548 if (elf->elf_class == ELFCLASS ## B) { \
549 Elf ## B ## _Dyn *dyn; \
550 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
551 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
552 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
553 Elf ## B ## _Off offset; \
554 Elf ## B ## _Xword word; \
555 /* Scan all the program headers */ \
556 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
557 /* Just scan dynamic headers */ \
558 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
559 offset = EGET(phdr[i].p_offset); \
560 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
561 /* Just scan dynamic RPATH/RUNPATH headers */ \
562 dyn = DYN ## B (elf->vdata + offset); \
563 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
564 if (word == DT_RPATH) { \
565 r = &rpath; \
566 } else if (word == DT_RUNPATH) { \
567 r = &runpath; \
568 } else { \
569 ++dyn; \
570 continue; \
571 } \
572 /* Verify the memory is somewhat sane */ \
573 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
574 if (offset < (Elf ## B ## _Off)elf->len) { \
575 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
576 *r = elf->data + offset; \
577 /* cache the length in case we need to nuke this section later on */ \
578 if (fix_elf) \
579 offset = strlen(*r); \
580 /* If quiet, don't output paths in ld.so.conf */ \
581 if (be_quiet) { \
582 size_t len; \
583 char *start, *end; \
584 /* note that we only 'chop' off leading known paths. */ \
585 /* since *r is read-only memory, we can only move the ptr forward. */ \
586 start = *r; \
587 /* scan each path in : delimited list */ \
588 while (start) { \
589 rpath_security_checks(elf, start, get_elfdtype(word)); \
590 end = strchr(start, ':'); \
591 len = (end ? abs(end - start) : strlen(start)); \
592 if (use_ldcache) { \
593 size_t n; \
594 const char *ldpath; \
595 array_for_each(ldpaths, n, ldpath) \
596 if (!strncmp(ldpath, start, len) && !ldpath[len]) { \
597 *r = end; \
598 /* corner case ... if RPATH reads "/usr/lib:", we want \
599 * to show ':' rather than '' */ \
600 if (end && end[1] != '\0') \
601 (*r)++; \
602 break; \
603 } \
604 } \
605 if (!*r || !end) \
606 break; \
607 else \
608 start = start + len + 1; \
609 } \
610 } \
611 if (*r) { \
612 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
613 /* just nuke it */ \
614 nuke_it##B: \
615 memset(*r, 0x00, offset); \
616 *r = NULL; \
617 ESET(dyn->d_tag, DT_DEBUG); \
618 ESET(dyn->d_un.d_ptr, 0); \
619 } else if (fix_elf) { \
620 /* try to clean "bad" paths */ \
621 size_t len, tmpdir_len; \
622 char *start, *end; \
623 const char *tmpdir; \
624 start = *r; \
625 tmpdir = (getenv("TMPDIR") ? : "."); \
626 tmpdir_len = strlen(tmpdir); \
627 while (1) { \
628 end = strchr(start, ':'); \
629 if (start == end) { \
630 eat_this_path##B: \
631 len = strlen(end); \
632 memmove(start, end+1, len); \
633 start[len-1] = '\0'; \
634 end = start - 1; \
635 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
636 if (!end) { \
637 if (start == *r) \
638 goto nuke_it##B; \
639 *--start = '\0'; \
640 } else \
641 goto eat_this_path##B; \
642 } \
643 if (!end) \
644 break; \
645 start = end + 1; \
646 } \
647 if (**r == '\0') \
648 goto nuke_it##B; \
649 } \
650 if (*r) \
651 *found_rpath = 1; \
652 } \
653 } \
654 ++dyn; \
655 } \
656 } }
657 SHOW_RPATH(32)
658 SHOW_RPATH(64)
659 }
660
661 if (be_wewy_wewy_quiet) return;
662
663 if (rpath && runpath) {
664 if (!strcmp(rpath, runpath)) {
665 xstrcat(ret, runpath, ret_len);
666 } else {
667 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
668 xchrcat(ret, '{', ret_len);
669 xstrcat(ret, rpath, ret_len);
670 xchrcat(ret, ',', ret_len);
671 xstrcat(ret, runpath, ret_len);
672 xchrcat(ret, '}', ret_len);
673 }
674 } else if (rpath || runpath)
675 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
676 else if (!be_quiet)
677 xstrcat(ret, " - ", ret_len);
678 }
679
680 #define LDSO_CACHE_MAGIC "ld.so-"
681 #define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
682 #define LDSO_CACHE_VER "1.7.0"
683 #define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
684 #define FLAG_ANY -1
685 #define FLAG_TYPE_MASK 0x00ff
686 #define FLAG_LIBC4 0x0000
687 #define FLAG_ELF 0x0001
688 #define FLAG_ELF_LIBC5 0x0002
689 #define FLAG_ELF_LIBC6 0x0003
690 #define FLAG_REQUIRED_MASK 0xff00
691 #define FLAG_SPARC_LIB64 0x0100
692 #define FLAG_IA64_LIB64 0x0200
693 #define FLAG_X8664_LIB64 0x0300
694 #define FLAG_S390_LIB64 0x0400
695 #define FLAG_POWERPC_LIB64 0x0500
696 #define FLAG_MIPS64_LIBN32 0x0600
697 #define FLAG_MIPS64_LIBN64 0x0700
698
699 static char *lookup_cache_lib(elfobj *, char *);
700
701 #if defined(__GLIBC__) || defined(__UCLIBC__)
702
703 static char *lookup_cache_lib(elfobj *elf, char *fname)
704 {
705 int fd;
706 char *strs;
707 static char buf[__PAX_UTILS_PATH_MAX] = "";
708 const char cachefile[] = "/etc/ld.so.cache";
709 struct stat st;
710
711 typedef struct {
712 char magic[LDSO_CACHE_MAGIC_LEN];
713 char version[LDSO_CACHE_VER_LEN];
714 int nlibs;
715 } header_t;
716 header_t *header;
717
718 typedef struct {
719 int flags;
720 int sooffset;
721 int liboffset;
722 } libentry_t;
723 libentry_t *libent;
724
725 if (fname == NULL)
726 return NULL;
727
728 if (ldcache == NULL) {
729 if (stat(cachefile, &st))
730 return NULL;
731
732 fd = open(cachefile, O_RDONLY);
733 if (fd == -1)
734 return NULL;
735
736 /* cache these values so we only map/unmap the cache file once */
737 ldcache_size = st.st_size;
738 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
739 close(fd);
740
741 if (ldcache == MAP_FAILED) {
742 ldcache = NULL;
743 return NULL;
744 }
745
746 if (memcmp(header->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN) ||
747 memcmp(header->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
748 {
749 munmap(ldcache, ldcache_size);
750 ldcache = NULL;
751 return NULL;
752 }
753 } else
754 header = ldcache;
755
756 libent = ldcache + sizeof(header_t);
757 strs = (char *) &libent[header->nlibs];
758
759 for (fd = 0; fd < header->nlibs; ++fd) {
760 /* This should be more fine grained, but for now we assume that
761 * diff arches will not be cached together, and we ignore the
762 * the different multilib mips cases.
763 */
764 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
765 continue;
766 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
767 continue;
768
769 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
770 continue;
771
772 /* Return first hit because that is how the ldso rolls */
773 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
774 break;
775 }
776
777 return buf;
778 }
779
780 #elif defined(__NetBSD__)
781 static char *lookup_cache_lib(elfobj *elf, char *fname)
782 {
783 static char buf[__PAX_UTILS_PATH_MAX] = "";
784 static struct stat st;
785 size_t n;
786 char *ldpath;
787
788 array_for_each(ldpath, n, ldpath) {
789 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", ldpath, fname) >= sizeof(buf))
790 continue; /* if the pathname is too long, or something went wrong, ignore */
791
792 if (stat(buf, &st) != 0)
793 continue; /* if the lib doesn't exist in *ldpath, look further */
794
795 /* NetBSD doesn't actually do sanity checks, it just loads the file
796 * and if that doesn't work, continues looking in other directories.
797 * This cannot easily be safely emulated, unfortunately. For now,
798 * just assume that if it exists, it's a valid library. */
799
800 return buf;
801 }
802
803 /* not found in any path */
804 return NULL;
805 }
806 #else
807 #ifdef __ELF__
808 #warning Cache support not implemented for your target
809 #endif
810 static char *lookup_cache_lib(elfobj *elf, char *fname)
811 {
812 return NULL;
813 }
814 #endif
815
816 static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
817 {
818 unsigned long i;
819 char *needed;
820 void *strtbl_void;
821 char *p;
822
823 /*
824 * -n -> op==0 -> print all
825 * -N -> op==1 -> print requested
826 */
827 if ((op == 0 && !show_needed) || (op == 1 && !find_lib))
828 return NULL;
829
830 strtbl_void = elf_findsecbyname(elf, ".dynstr");
831
832 if (elf->phdr && strtbl_void) {
833 #define SHOW_NEEDED(B) \
834 if (elf->elf_class == ELFCLASS ## B) { \
835 Elf ## B ## _Dyn *dyn; \
836 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
837 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
838 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
839 Elf ## B ## _Off offset; \
840 size_t matched = 0; \
841 /* Walk all the program headers to find the PT_DYNAMIC */ \
842 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
843 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) \
844 continue; \
845 offset = EGET(phdr[i].p_offset); \
846 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
847 continue; \
848 /* Walk all the dynamic tags to find NEEDED entries */ \
849 dyn = DYN ## B (elf->vdata + offset); \
850 while (EGET(dyn->d_tag) != DT_NULL) { \
851 if (EGET(dyn->d_tag) == DT_NEEDED) { \
852 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
853 if (offset >= (Elf ## B ## _Off)elf->len) { \
854 ++dyn; \
855 continue; \
856 } \
857 needed = elf->data + offset; \
858 if (op == 0) { \
859 /* -n -> print all entries */ \
860 if (!be_wewy_wewy_quiet) { \
861 if (*found_needed) xchrcat(ret, ',', ret_len); \
862 if (use_ldcache) \
863 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
864 needed = p; \
865 xstrcat(ret, needed, ret_len); \
866 } \
867 *found_needed = 1; \
868 } else { \
869 /* -N -> print matching entries */ \
870 size_t n; \
871 const char *find_lib_name; \
872 \
873 array_for_each(find_lib_arr, n, find_lib_name) \
874 if (!strcmp(find_lib_name, needed)) \
875 ++matched; \
876 \
877 if (matched == array_cnt(find_lib_arr)) { \
878 *found_lib = 1; \
879 return (be_wewy_wewy_quiet ? NULL : find_lib); \
880 } \
881 } \
882 } \
883 ++dyn; \
884 } \
885 } }
886 SHOW_NEEDED(32)
887 SHOW_NEEDED(64)
888 if (op == 0 && !*found_needed && be_verbose)
889 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
890 }
891
892 return NULL;
893 }
894 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
895 {
896 void *strtbl_void;
897
898 if (!show_interp) return NULL;
899
900 strtbl_void = elf_findsecbyname(elf, ".interp");
901
902 if (strtbl_void) {
903 #define SHOW_INTERP(B) \
904 if (elf->elf_class == ELFCLASS ## B) { \
905 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
906 *found_interp = 1; \
907 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
908 }
909 SHOW_INTERP(32)
910 SHOW_INTERP(64)
911 }
912 return NULL;
913 }
914 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
915 {
916 unsigned long i;
917 struct stat s;
918 char dynamic = 0;
919
920 if (!show_bind) return NULL;
921 if (!elf->phdr) return NULL;
922
923 #define SHOW_BIND(B) \
924 if (elf->elf_class == ELFCLASS ## B) { \
925 Elf ## B ## _Dyn *dyn; \
926 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
927 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
928 Elf ## B ## _Off offset; \
929 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
930 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
931 dynamic = 1; \
932 offset = EGET(phdr[i].p_offset); \
933 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
934 dyn = DYN ## B (elf->vdata + offset); \
935 while (EGET(dyn->d_tag) != DT_NULL) { \
936 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
937 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
938 { \
939 if (be_quiet) return NULL; \
940 *found_bind = 1; \
941 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
942 } \
943 ++dyn; \
944 } \
945 } \
946 }
947 SHOW_BIND(32)
948 SHOW_BIND(64)
949
950 if (be_wewy_wewy_quiet) return NULL;
951
952 /* don't output anything if quiet mode and the ELF is static or not setuid */
953 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
954 return NULL;
955 } else {
956 *found_bind = 1;
957 return (char *)(dynamic ? "LAZY" : "STATIC");
958 }
959 }
960 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
961 {
962 unsigned long i;
963 char *soname;
964 void *strtbl_void;
965
966 if (!show_soname) return NULL;
967
968 strtbl_void = elf_findsecbyname(elf, ".dynstr");
969
970 if (elf->phdr && strtbl_void) {
971 #define SHOW_SONAME(B) \
972 if (elf->elf_class == ELFCLASS ## B) { \
973 Elf ## B ## _Dyn *dyn; \
974 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
975 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
976 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
977 Elf ## B ## _Off offset; \
978 /* only look for soname in shared objects */ \
979 if (EGET(ehdr->e_type) != ET_DYN) \
980 return NULL; \
981 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
982 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
983 offset = EGET(phdr[i].p_offset); \
984 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
985 dyn = DYN ## B (elf->vdata + offset); \
986 while (EGET(dyn->d_tag) != DT_NULL) { \
987 if (EGET(dyn->d_tag) == DT_SONAME) { \
988 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
989 if (offset >= (Elf ## B ## _Off)elf->len) { \
990 ++dyn; \
991 continue; \
992 } \
993 soname = elf->data + offset; \
994 *found_soname = 1; \
995 return (be_wewy_wewy_quiet ? NULL : soname); \
996 } \
997 ++dyn; \
998 } \
999 } }
1000 SHOW_SONAME(32)
1001 SHOW_SONAME(64)
1002 }
1003
1004 return NULL;
1005 }
1006
1007 /*
1008 * We support the symbol form:
1009 * [%[modifiers]%][[+-]<symbol name>][,[.....]]
1010 * If the symbol name is empty, then all symbols are matched.
1011 * If the symbol name is a glob ("*"), then all symbols are dumped (debug).
1012 * Do not rely on this output format at all.
1013 * Otherwise the symbol name is used to search (either regex or string compare).
1014 * If the first char of the symbol name is a plus ("+"), then only match
1015 * defined symbols. If it's a minus ("-"), only match undefined symbols.
1016 * Putting modifiers in between the percent signs allows for more in depth
1017 * filters. There are groups of modifiers. If you don't specify a member
1018 * of a group, then all types in that group are matched. The current
1019 * groups and their types are:
1020 * STT group: STT_NOTYPE:n STT_OBJECT:o STT_FUNC:f SST_FILE:F
1021 * STB group: STB_LOCAL:l STB_GLOBAL:g STB_WEAK:w
1022 * SHN group: SHN_UNDEF:u SHN_ABS:a SHN_COMMON:c {defined}:d
1023 * The "defined" value in the SHN group does not correspond to a SHN_xxx define.
1024 * You can search for multiple symbols at once by seperating with a comma (",").
1025 *
1026 * Some examples:
1027 * ELFs with a weak function "foo":
1028 * scanelf -s %wf%foo <ELFs>
1029 * ELFs that define the symbol "main":
1030 * scanelf -s +main <ELFs>
1031 * scanelf -s %d%main <ELFs>
1032 * ELFs that refer to the undefined symbol "brk":
1033 * scanelf -s -brk <ELFs>
1034 * scanelf -s %u%brk <ELFs>
1035 * All global defined objects in an ELF:
1036 * scanelf -s %ogd% <ELF>
1037 */
1038 static void
1039 scanelf_match_symname(elfobj *elf, char *found_sym, char **ret, size_t *ret_len, const char *symname,
1040 unsigned int stt, unsigned int stb, unsigned int shn, unsigned long size)
1041 {
1042 char *this_sym, *next_sym, saved = saved;
1043
1044 /* allow the user to specify a comma delimited list of symbols to search for */
1045 next_sym = NULL;
1046 do {
1047 bool 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
1051 if (next_sym) {
1052 next_sym[-1] = saved;
1053 this_sym = next_sym;
1054 } else
1055 this_sym = find_sym;
1056 if ((next_sym = strchr(this_sym, ','))) {
1057 /* make parsing easier by killing the comma temporarily */
1058 saved = *next_sym;
1059 *next_sym = '\0';
1060 next_sym += 1;
1061 }
1062
1063 /* symbol selection! */
1064 inc_notype = inc_object = inc_func = inc_file = \
1065 inc_local = inc_global = inc_weak = \
1066 inc_def = inc_undef = inc_abs = inc_common = \
1067 (*this_sym != '%');
1068
1069 /* parse the contents of %...% */
1070 if (!inc_notype) {
1071 while (*(this_sym++)) {
1072 if (*this_sym == '%') {
1073 ++this_sym;
1074 break;
1075 }
1076 switch (*this_sym) {
1077 case 'n': inc_notype = true; break;
1078 case 'o': inc_object = true; break;
1079 case 'f': inc_func = true; break;
1080 case 'F': inc_file = true; break;
1081 case 'l': inc_local = true; break;
1082 case 'g': inc_global = true; break;
1083 case 'w': inc_weak = true; break;
1084 case 'd': inc_def = true; break;
1085 case 'u': inc_undef = true; break;
1086 case 'a': inc_abs = true; break;
1087 case 'c': inc_common = true; break;
1088 default: err("invalid symbol selector '%c'", *this_sym);
1089 }
1090 }
1091
1092 /* If no types are matched, not match all */
1093 if (!inc_notype && !inc_object && !inc_func && !inc_file)
1094 inc_notype = inc_object = inc_func = inc_file = true;
1095 if (!inc_local && !inc_global && !inc_weak)
1096 inc_local = inc_global = inc_weak = true;
1097 if (!inc_def && !inc_undef && !inc_abs && !inc_common)
1098 inc_def = inc_undef = inc_abs = inc_common = true;
1099
1100 /* backwards compat for defined/undefined short hand */
1101 } else if (*this_sym == '+') {
1102 inc_undef = false;
1103 ++this_sym;
1104 } else if (*this_sym == '-') {
1105 inc_def = inc_abs = inc_common = false;
1106 ++this_sym;
1107 }
1108
1109 /* filter symbols */
1110 if ((!inc_notype && stt == STT_NOTYPE) || \
1111 (!inc_object && stt == STT_OBJECT) || \
1112 (!inc_func && stt == STT_FUNC ) || \
1113 (!inc_file && stt == STT_FILE ) || \
1114 (!inc_local && stb == STB_LOCAL ) || \
1115 (!inc_global && stb == STB_GLOBAL) || \
1116 (!inc_weak && stb == STB_WEAK ) || \
1117 (!inc_def && shn && shn < SHN_LORESERVE) || \
1118 (!inc_undef && shn == SHN_UNDEF ) || \
1119 (!inc_abs && shn == SHN_ABS ) || \
1120 (!inc_common && shn == SHN_COMMON))
1121 continue;
1122
1123 if (*this_sym == '*') {
1124 /* a "*" symbol gets you debug output */
1125 printf("%s(%s) %5lX %15s %15s %15s %s\n",
1126 ((*found_sym == 0) ? "\n\t" : "\t"),
1127 elf->base_filename,
1128 size,
1129 get_elfstttype(stt),
1130 get_elfstbtype(stb),
1131 get_elfshntype(shn),
1132 symname);
1133 goto matched;
1134
1135 } else {
1136 if (g_match) {
1137 /* regex match the symbol */
1138 if (rematch(this_sym, symname, REG_EXTENDED) != 0)
1139 continue;
1140
1141 } else if (*this_sym) {
1142 /* give empty symbols a "pass", else do a normal compare */
1143 const size_t len = strlen(this_sym);
1144 if (!(strncmp(this_sym, symname, len) == 0 &&
1145 /* Accept unversioned symbol names */
1146 (symname[len] == '\0' || symname[len] == '@')))
1147 continue;
1148 }
1149
1150 if (be_semi_verbose) {
1151 char buf[1024];
1152 snprintf(buf, sizeof(buf), "%lX %s %s",
1153 size,
1154 get_elfstttype(stt),
1155 this_sym);
1156 *ret = xstrdup(buf);
1157 } else {
1158 if (*ret) xchrcat(ret, ',', ret_len);
1159 xstrcat(ret, symname, ret_len);
1160 }
1161
1162 goto matched;
1163 }
1164 } while (next_sym);
1165
1166 return;
1167
1168 matched:
1169 *found_sym = 1;
1170 if (next_sym)
1171 next_sym[-1] = saved;
1172 }
1173
1174 static const char *scanelf_file_sym(elfobj *elf, char *found_sym)
1175 {
1176 unsigned long i;
1177 char *ret;
1178 void *symtab_void, *strtab_void;
1179
1180 if (!find_sym) return NULL;
1181 ret = NULL;
1182
1183 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
1184
1185 if (symtab_void && strtab_void) {
1186 #define FIND_SYM(B) \
1187 if (elf->elf_class == ELFCLASS ## B) { \
1188 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
1189 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
1190 Elf ## B ## _Sym *sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
1191 unsigned long cnt = EGET(symtab->sh_entsize); \
1192 char *symname; \
1193 size_t ret_len = 0; \
1194 if (cnt) \
1195 cnt = EGET(symtab->sh_size) / cnt; \
1196 for (i = 0; i < cnt; ++i) { \
1197 if ((void*)sym > elf->data_end) { \
1198 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1199 goto break_out; \
1200 } \
1201 if (sym->st_name) { \
1202 /* make sure the symbol name is in acceptable memory range */ \
1203 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
1204 if ((void*)symname > elf->data_end) { \
1205 warnf("%s: corrupt ELF symbols", elf->filename); \
1206 ++sym; \
1207 continue; \
1208 } \
1209 scanelf_match_symname(elf, found_sym, \
1210 &ret, &ret_len, symname, \
1211 ELF##B##_ST_TYPE(EGET(sym->st_info)), \
1212 ELF##B##_ST_BIND(EGET(sym->st_info)), \
1213 EGET(sym->st_shndx), \
1214 /* st_size can be 64bit, but no one is really that big, so screw em */ \
1215 EGET(sym->st_size)); \
1216 } \
1217 ++sym; \
1218 } }
1219 FIND_SYM(32)
1220 FIND_SYM(64)
1221 }
1222
1223 break_out:
1224 if (be_wewy_wewy_quiet) return NULL;
1225
1226 if (*find_sym != '*' && *found_sym)
1227 return ret;
1228 if (be_quiet)
1229 return NULL;
1230 else
1231 return " - ";
1232 }
1233
1234 static const char *scanelf_file_sections(elfobj *elf, char *found_section)
1235 {
1236 if (!find_section)
1237 return NULL;
1238
1239 #define FIND_SECTION(B) \
1240 if (elf->elf_class == ELFCLASS ## B) { \
1241 size_t matched, n; \
1242 int invert; \
1243 const char *section_name; \
1244 Elf ## B ## _Shdr *section; \
1245 \
1246 matched = 0; \
1247 array_for_each(find_section_arr, n, section_name) { \
1248 invert = (*section_name == '!' ? 1 : 0); \
1249 section = SHDR ## B (elf_findsecbyname(elf, section_name + invert)); \
1250 if ((section == NULL && invert) || (section != NULL && !invert)) \
1251 ++matched; \
1252 } \
1253 \
1254 if (matched == array_cnt(find_section_arr)) \
1255 *found_section = 1; \
1256 }
1257 FIND_SECTION(32)
1258 FIND_SECTION(64)
1259
1260 if (be_wewy_wewy_quiet)
1261 return NULL;
1262
1263 if (*found_section)
1264 return find_section;
1265
1266 if (be_quiet)
1267 return NULL;
1268 else
1269 return " - ";
1270 }
1271
1272 /* scan an elf file and show all the fun stuff */
1273 #define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
1274 static int scanelf_elfobj(elfobj *elf)
1275 {
1276 unsigned long i;
1277 char found_pax, found_phdr, found_relro, found_load, found_textrel,
1278 found_rpath, found_needed, found_interp, found_bind, found_soname,
1279 found_sym, found_lib, found_file, found_textrels, found_section;
1280 static char *out_buffer = NULL;
1281 static size_t out_len;
1282
1283 found_pax = found_phdr = found_relro = found_load = found_textrel = \
1284 found_rpath = found_needed = found_interp = found_bind = found_soname = \
1285 found_sym = found_lib = found_file = found_textrels = found_section = 0;
1286
1287 if (be_verbose > 2)
1288 printf("%s: scanning file {%s,%s}\n", elf->filename,
1289 get_elfeitype(EI_CLASS, elf->elf_class),
1290 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
1291 else if (be_verbose > 1)
1292 printf("%s: scanning file\n", elf->filename);
1293
1294 /* init output buffer */
1295 if (!out_buffer) {
1296 out_len = sizeof(char) * 80;
1297 out_buffer = xmalloc(out_len);
1298 }
1299 *out_buffer = '\0';
1300
1301 /* show the header */
1302 if (!be_quiet && show_banner) {
1303 for (i = 0; out_format[i]; ++i) {
1304 if (!IS_MODIFIER(out_format[i])) continue;
1305
1306 switch (out_format[++i]) {
1307 case '+': break;
1308 case '%': break;
1309 case '#': break;
1310 case 'F':
1311 case 'p':
1312 case 'f': prints("FILE "); found_file = 1; break;
1313 case 'o': prints(" TYPE "); break;
1314 case 'x': prints(" PAX "); break;
1315 case 'e': prints("STK/REL/PTL "); break;
1316 case 't': prints("TEXTREL "); break;
1317 case 'r': prints("RPATH "); break;
1318 case 'M': prints("CLASS "); break;
1319 case 'n': prints("NEEDED "); break;
1320 case 'i': prints("INTERP "); break;
1321 case 'b': prints("BIND "); break;
1322 case 'Z': prints("SIZE "); break;
1323 case 'S': prints("SONAME "); break;
1324 case 's': prints("SYM "); break;
1325 case 'N': prints("LIB "); break;
1326 case 'T': prints("TEXTRELS "); break;
1327 case 'k': prints("SECTION "); break;
1328 case 'a': prints("ARCH "); break;
1329 case 'I': prints("OSABI "); break;
1330 case 'Y': prints("EABI "); break;
1331 case 'O': prints("PERM "); break;
1332 case 'D': prints("ENDIAN "); break;
1333 default: warnf("'%c' has no title ?", out_format[i]);
1334 }
1335 }
1336 if (!found_file) prints("FILE ");
1337 prints("\n");
1338 found_file = 0;
1339 show_banner = 0;
1340 }
1341
1342 /* dump all the good stuff */
1343 for (i = 0; out_format[i]; ++i) {
1344 const char *out;
1345 const char *tmp;
1346 static char ubuf[sizeof(unsigned long)*2];
1347 if (!IS_MODIFIER(out_format[i])) {
1348 xchrcat(&out_buffer, out_format[i], &out_len);
1349 continue;
1350 }
1351
1352 out = NULL;
1353 be_wewy_wewy_quiet = (out_format[i] == '#');
1354 be_semi_verbose = (out_format[i] == '+');
1355 switch (out_format[++i]) {
1356 case '+':
1357 case '%':
1358 case '#':
1359 xchrcat(&out_buffer, out_format[i], &out_len); break;
1360 case 'F':
1361 found_file = 1;
1362 if (be_wewy_wewy_quiet) break;
1363 xstrcat(&out_buffer, elf->filename, &out_len);
1364 break;
1365 case 'p':
1366 found_file = 1;
1367 if (be_wewy_wewy_quiet) break;
1368 tmp = elf->filename;
1369 if (search_path) {
1370 ssize_t len_search = strlen(search_path);
1371 ssize_t len_file = strlen(elf->filename);
1372 if (!strncmp(elf->filename, search_path, len_search) && \
1373 len_file > len_search)
1374 tmp += len_search;
1375 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1376 }
1377 xstrcat(&out_buffer, tmp, &out_len);
1378 break;
1379 case 'f':
1380 found_file = 1;
1381 if (be_wewy_wewy_quiet) break;
1382 tmp = strrchr(elf->filename, '/');
1383 tmp = (tmp == NULL ? elf->filename : tmp+1);
1384 xstrcat(&out_buffer, tmp, &out_len);
1385 break;
1386 case 'o': out = get_elfetype(elf); break;
1387 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
1388 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
1389 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1390 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
1391 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1392 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1393 case 'D': out = get_endian(elf); break;
1394 case 'O': out = strfileperms(elf->filename); break;
1395 case 'n':
1396 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
1397 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1398 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1399 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
1400 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1401 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1402 case 'a': out = get_elfemtype(elf); break;
1403 case 'I': out = get_elfosabi(elf); break;
1404 case 'Y': out = get_elf_eabi(elf); break;
1405 case 'Z': snprintf(ubuf, sizeof(ubuf), "%lu", (unsigned long)elf->len); out = ubuf; break;;
1406 default: warnf("'%c' has no scan code?", out_format[i]);
1407 }
1408 if (out)
1409 xstrcat(&out_buffer, out, &out_len);
1410 }
1411
1412 #define FOUND_SOMETHING() \
1413 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1414 found_rpath || found_needed || found_interp || found_bind || \
1415 found_soname || found_sym || found_lib || found_textrels || found_section )
1416
1417 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1418 xchrcat(&out_buffer, ' ', &out_len);
1419 xstrcat(&out_buffer, elf->filename, &out_len);
1420 }
1421 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
1422 puts(out_buffer);
1423 fflush(stdout);
1424 }
1425
1426 return 0;
1427 }
1428
1429 /* scan a single elf */
1430 static int scanelf_elf(const char *filename, int fd, size_t len)
1431 {
1432 int ret = 1;
1433 elfobj *elf;
1434
1435 /* verify this is real ELF */
1436 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1437 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1438 return ret;
1439 }
1440 switch (match_bits) {
1441 case 32:
1442 if (elf->elf_class != ELFCLASS32)
1443 goto label_done;
1444 break;
1445 case 64:
1446 if (elf->elf_class != ELFCLASS64)
1447 goto label_done;
1448 break;
1449 default: break;
1450 }
1451 if (match_etypes) {
1452 char sbuf[126];
1453 strncpy(sbuf, match_etypes, sizeof(sbuf));
1454 if (strchr(match_etypes, ',') != NULL) {
1455 char *p;
1456 while ((p = strrchr(sbuf, ',')) != NULL) {
1457 *p = 0;
1458 if (etype_lookup(p+1) == get_etype(elf))
1459 goto label_ret;
1460 }
1461 }
1462 if (etype_lookup(sbuf) != get_etype(elf))
1463 goto label_done;
1464 }
1465
1466 label_ret:
1467 ret = scanelf_elfobj(elf);
1468
1469 label_done:
1470 unreadelf(elf);
1471 return ret;
1472 }
1473
1474 /* scan an archive of elfs */
1475 static int scanelf_archive(const char *filename, int fd, size_t len)
1476 {
1477 archive_handle *ar;
1478 archive_member *m;
1479 char *ar_buffer;
1480 elfobj *elf;
1481
1482 ar = ar_open_fd(filename, fd);
1483 if (ar == NULL)
1484 return 1;
1485
1486 ar_buffer = mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1487 while ((m = ar_next(ar)) != NULL) {
1488 off_t cur_pos = lseek(fd, 0, SEEK_CUR);
1489 if (cur_pos == -1)
1490 errp("lseek() failed");
1491 elf = readelf_buffer(m->name, ar_buffer + cur_pos, m->size);
1492 if (elf) {
1493 scanelf_elfobj(elf);
1494 unreadelf(elf);
1495 }
1496 }
1497 munmap(ar_buffer, len);
1498
1499 return 0;
1500 }
1501 /* scan a file which may be an elf or an archive or some other magical beast */
1502 static int scanelf_file(const char *filename, const struct stat *st_cache)
1503 {
1504 const struct stat *st = st_cache;
1505 struct stat symlink_st;
1506 int fd;
1507
1508 /* always handle regular files and handle symlinked files if no -y */
1509 if (S_ISLNK(st->st_mode)) {
1510 if (!scan_symlink) return 1;
1511 stat(filename, &symlink_st);
1512 st = &symlink_st;
1513 }
1514
1515 if (!S_ISREG(st->st_mode)) {
1516 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1517 return 1;
1518 }
1519
1520 if (match_perms) {
1521 if ((st->st_mode | match_perms) != st->st_mode)
1522 return 1;
1523 }
1524 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1525 return 1;
1526
1527 if (scanelf_elf(filename, fd, st->st_size) == 1 && scan_archives)
1528 /* if it isn't an ELF, maybe it's an .a archive */
1529 scanelf_archive(filename, fd, st->st_size);
1530
1531 close(fd);
1532 return 0;
1533 }
1534
1535 static const char *maybe_add_root(const char *fname, char *buf)
1536 {
1537 if (root && strncmp(fname, root, strlen(root))) {
1538 strcpy(buf, root);
1539 strncat(buf, fname, __PAX_UTILS_PATH_MAX - strlen(root) - 1);
1540 fname = buf;
1541 }
1542 return fname;
1543 }
1544
1545 /* scan a directory for ET_EXEC files and print when we find one */
1546 static int scanelf_dir(const char *path)
1547 {
1548 register DIR *dir;
1549 register struct dirent *dentry;
1550 struct stat st_top, st;
1551 char buf[__PAX_UTILS_PATH_MAX];
1552 char _path[__PAX_UTILS_PATH_MAX];
1553 size_t pathlen = 0, len = 0;
1554 int ret = 0;
1555
1556 path = maybe_add_root(path, _path);
1557
1558 /* make sure path exists */
1559 if (lstat(path, &st_top) == -1) {
1560 if (be_verbose > 2) printf("%s: does not exist\n", path);
1561 return 1;
1562 }
1563
1564 /* ok, if it isn't a directory, assume we can open it */
1565 if (!S_ISDIR(st_top.st_mode)) {
1566 return scanelf_file(path, &st_top);
1567 }
1568
1569 /* now scan the dir looking for fun stuff */
1570 if ((dir = opendir(path)) == NULL) {
1571 warnf("could not opendir %s: %s", path, strerror(errno));
1572 return 1;
1573 }
1574 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1575
1576 pathlen = strlen(path);
1577 while ((dentry = readdir(dir))) {
1578 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1579 continue;
1580 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
1581 if (len >= sizeof(buf)) {
1582 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1583 (unsigned long)len, (unsigned long)sizeof(buf));
1584 continue;
1585 }
1586 snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name);
1587 if (lstat(buf, &st) != -1) {
1588 if (S_ISREG(st.st_mode))
1589 ret = scanelf_file(buf, &st);
1590 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1591 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1592 ret = scanelf_dir(buf);
1593 }
1594 }
1595 }
1596 closedir(dir);
1597 return ret;
1598 }
1599
1600 static int scanelf_from_file(const char *filename)
1601 {
1602 FILE *fp = NULL;
1603 char *p;
1604 char path[__PAX_UTILS_PATH_MAX];
1605 int ret = 0;
1606
1607 if (strcmp(filename, "-") == 0)
1608 fp = stdin;
1609 else if ((fp = fopen(filename, "r")) == NULL)
1610 return 1;
1611
1612 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1613 if ((p = strchr(path, '\n')) != NULL)
1614 *p = 0;
1615 search_path = path;
1616 ret = scanelf_dir(path);
1617 }
1618 if (fp != stdin)
1619 fclose(fp);
1620 return ret;
1621 }
1622
1623 #if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1624
1625 static int load_ld_cache_config(int i, const char *fname)
1626 {
1627 FILE *fp = NULL;
1628 char *p;
1629 char path[__PAX_UTILS_PATH_MAX];
1630 char _fname[__PAX_UTILS_PATH_MAX];
1631
1632 fname = maybe_add_root(fname, _fname);
1633
1634 if ((fp = fopen(fname, "r")) == NULL)
1635 return i;
1636
1637 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1638 if ((p = strrchr(path, '\r')) != NULL)
1639 *p = 0;
1640 if ((p = strchr(path, '\n')) != NULL)
1641 *p = 0;
1642
1643 /* recursive includes of the same file will make this segfault. */
1644 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1645 glob_t gl;
1646 size_t x;
1647 char gpath[__PAX_UTILS_PATH_MAX];
1648
1649 memset(gpath, 0, sizeof(gpath));
1650 if (root)
1651 strcpy(gpath, root);
1652
1653 if (path[8] != '/')
1654 snprintf(gpath+strlen(gpath), sizeof(gpath)-strlen(gpath), "/etc/%s", &path[8]);
1655 else
1656 strncpy(gpath+strlen(gpath), &path[8], sizeof(gpath)-strlen(gpath));
1657
1658 if (glob(gpath, 0, NULL, &gl) == 0) {
1659 for (x = 0; x < gl.gl_pathc; ++x) {
1660 /* try to avoid direct loops */
1661 if (strcmp(gl.gl_pathv[x], fname) == 0)
1662 continue;
1663 i = load_ld_cache_config(i, gl.gl_pathv[x]);
1664 }
1665 globfree(&gl);
1666 continue;
1667 }
1668 }
1669
1670 if (*path != '/')
1671 continue;
1672
1673 xarraypush(ldpaths, path, strlen(path));
1674 }
1675
1676 fclose(fp);
1677 return i;
1678 }
1679
1680 #elif defined(__FreeBSD__) || defined(__DragonFly__)
1681
1682 static int load_ld_cache_config(int i, const char *fname)
1683 {
1684 FILE *fp = NULL;
1685 char *b = NULL, *p;
1686 struct elfhints_hdr hdr;
1687 char _fname[__PAX_UTILS_PATH_MAX];
1688
1689 fname = maybe_add_root(fname, _fname);
1690
1691 if ((fp = fopen(fname, "r")) == NULL)
1692 return i;
1693
1694 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1695 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1696 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1697 {
1698 fclose(fp);
1699 return i;
1700 }
1701
1702 b = xmalloc(hdr.dirlistlen + 1);
1703 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1704 fclose(fp);
1705 free(b);
1706 return i;
1707 }
1708
1709 while ((p = strsep(&b, ":"))) {
1710 if (*p == '\0')
1711 continue;
1712 xarraypush(ldpaths, p, strlen(p));
1713 }
1714
1715 free(b);
1716 fclose(fp);
1717 return i;
1718 }
1719
1720 #else
1721 #ifdef __ELF__
1722 #warning Cache config support not implemented for your target
1723 #endif
1724 static int load_ld_cache_config(int i, const char *fname)
1725 {
1726 return 0;
1727 }
1728 #endif
1729
1730 /* scan /etc/ld.so.conf for paths */
1731 static void scanelf_ldpath(void)
1732 {
1733 char scan_l, scan_ul, scan_ull;
1734 size_t n;
1735 const char *ldpath;
1736 int i = 0;
1737
1738 if (array_cnt(ldpaths) == 0)
1739 err("Unable to load any paths from ld.so.conf");
1740
1741 scan_l = scan_ul = scan_ull = 0;
1742
1743 array_for_each(ldpaths, n, ldpath) {
1744 if (!scan_l && !strcmp(ldpath, "/lib")) scan_l = 1;
1745 if (!scan_ul && !strcmp(ldpath, "/usr/lib")) scan_ul = 1;
1746 if (!scan_ull && !strcmp(ldpath, "/usr/local/lib")) scan_ull = 1;
1747 scanelf_dir(ldpath);
1748 ++i;
1749 }
1750
1751 if (!scan_l) scanelf_dir("/lib");
1752 if (!scan_ul) scanelf_dir("/usr/lib");
1753 if (!scan_ull) scanelf_dir("/usr/local/lib");
1754 }
1755
1756 /* scan env PATH for paths */
1757 static void scanelf_envpath(void)
1758 {
1759 char *path, *p;
1760
1761 path = getenv("PATH");
1762 if (!path)
1763 err("PATH is not set in your env !");
1764 path = xstrdup(path);
1765
1766 while ((p = strrchr(path, ':')) != NULL) {
1767 scanelf_dir(p + 1);
1768 *p = 0;
1769 }
1770
1771 free(path);
1772 }
1773
1774 /* usage / invocation handling functions */ /* Free Flags: c d j u w G H J K P Q U W */
1775 #define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZCBhV"
1776 #define a_argument required_argument
1777 static struct option const long_opts[] = {
1778 {"path", no_argument, NULL, 'p'},
1779 {"ldpath", no_argument, NULL, 'l'},
1780 {"root", a_argument, NULL, 128},
1781 {"recursive", no_argument, NULL, 'R'},
1782 {"mount", no_argument, NULL, 'm'},
1783 {"symlink", no_argument, NULL, 'y'},
1784 {"archives", no_argument, NULL, 'A'},
1785 {"ldcache", no_argument, NULL, 'L'},
1786 {"fix", no_argument, NULL, 'X'},
1787 {"setpax", a_argument, NULL, 'z'},
1788 {"pax", no_argument, NULL, 'x'},
1789 {"header", no_argument, NULL, 'e'},
1790 {"textrel", no_argument, NULL, 't'},
1791 {"rpath", no_argument, NULL, 'r'},
1792 {"needed", no_argument, NULL, 'n'},
1793 {"interp", no_argument, NULL, 'i'},
1794 {"bind", no_argument, NULL, 'b'},
1795 {"soname", no_argument, NULL, 'S'},
1796 {"symbol", a_argument, NULL, 's'},
1797 {"section", a_argument, NULL, 'k'},
1798 {"lib", a_argument, NULL, 'N'},
1799 {"gmatch", no_argument, NULL, 'g'},
1800 {"textrels", no_argument, NULL, 'T'},
1801 {"etype", a_argument, NULL, 'E'},
1802 {"bits", a_argument, NULL, 'M'},
1803 {"endian", no_argument, NULL, 'D'},
1804 {"osabi", no_argument, NULL, 'I'},
1805 {"eabi", no_argument, NULL, 'Y'},
1806 {"perms", a_argument, NULL, 'O'},
1807 {"size", no_argument, NULL, 'Z'},
1808 {"all", no_argument, NULL, 'a'},
1809 {"quiet", no_argument, NULL, 'q'},
1810 {"verbose", no_argument, NULL, 'v'},
1811 {"format", a_argument, NULL, 'F'},
1812 {"from", a_argument, NULL, 'f'},
1813 {"file", a_argument, NULL, 'o'},
1814 {"nocolor", no_argument, NULL, 'C'},
1815 {"nobanner", no_argument, NULL, 'B'},
1816 {"help", no_argument, NULL, 'h'},
1817 {"version", no_argument, NULL, 'V'},
1818 {NULL, no_argument, NULL, 0x0}
1819 };
1820
1821 static const char * const opts_help[] = {
1822 "Scan all directories in PATH environment",
1823 "Scan all directories in /etc/ld.so.conf",
1824 "Root directory (use with -l or -p)",
1825 "Scan directories recursively",
1826 "Don't recursively cross mount points",
1827 "Don't scan symlinks",
1828 "Scan archives (.a files)",
1829 "Utilize ld.so.cache information (use with -r/-n)",
1830 "Try and 'fix' bad things (use with -r/-e)",
1831 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1832 "Print PaX markings",
1833 "Print GNU_STACK/PT_LOAD markings",
1834 "Print TEXTREL information",
1835 "Print RPATH information",
1836 "Print NEEDED information",
1837 "Print INTERP information",
1838 "Print BIND information",
1839 "Print SONAME information",
1840 "Find a specified symbol",
1841 "Find a specified section",
1842 "Find a specified library",
1843 "Use regex matching rather than string compare (use with -s)",
1844 "Locate cause of TEXTREL",
1845 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1846 "Print only ELF files matching numeric bits",
1847 "Print Endianness",
1848 "Print OSABI",
1849 "Print EABI (EM_ARM Only)",
1850 "Print only ELF files matching octal permissions",
1851 "Print ELF file size",
1852 "Print all useful/simple info\n",
1853 "Only output 'bad' things",
1854 "Be verbose (can be specified more than once)",
1855 "Use specified format for output",
1856 "Read input stream from a filename",
1857 "Write output stream to a filename",
1858 "Don't emit color in output",
1859 "Don't display the header",
1860 "Print this help and exit",
1861 "Print version and exit",
1862 NULL
1863 };
1864
1865 /* display usage and exit */
1866 static void usage(int status)
1867 {
1868 unsigned long i;
1869 printf("* Scan ELF binaries for stuff\n\n"
1870 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1871 printf("Options: -[%s]\n", PARSE_FLAGS);
1872 for (i = 0; long_opts[i].name; ++i)
1873 if (long_opts[i].has_arg == no_argument)
1874 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
1875 long_opts[i].name, opts_help[i]);
1876 else if (long_opts[i].val > '~')
1877 printf(" --%-7s <arg> * %s\n",
1878 long_opts[i].name, opts_help[i]);
1879 else
1880 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
1881 long_opts[i].name, opts_help[i]);
1882
1883 puts("\nFor more information, see the scanelf(1) manpage");
1884 exit(status);
1885 }
1886
1887 /* parse command line arguments and preform needed actions */
1888 #define do_pax_state(option, flag) \
1889 if (islower(option)) { \
1890 flags &= ~PF_##flag; \
1891 flags |= PF_NO##flag; \
1892 } else { \
1893 flags &= ~PF_NO##flag; \
1894 flags |= PF_##flag; \
1895 }
1896 static int parseargs(int argc, char *argv[])
1897 {
1898 int i;
1899 const char *from_file = NULL;
1900 int ret = 0;
1901
1902 opterr = 0;
1903 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1904 switch (i) {
1905
1906 case 'V':
1907 printf("pax-utils-%s: %s compiled %s\n%s\n"
1908 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
1909 VERSION, __FILE__, __DATE__, rcsid, argv0);
1910 exit(EXIT_SUCCESS);
1911 break;
1912 case 'h': usage(EXIT_SUCCESS); break;
1913 case 'f':
1914 if (from_file) warn("You prob don't want to specify -f twice");
1915 from_file = optarg;
1916 break;
1917 case 'E':
1918 match_etypes = optarg;
1919 break;
1920 case 'M':
1921 match_bits = atoi(optarg);
1922 if (match_bits == 0) {
1923 if (strcmp(optarg, "ELFCLASS32") == 0)
1924 match_bits = 32;
1925 if (strcmp(optarg, "ELFCLASS64") == 0)
1926 match_bits = 64;
1927 }
1928 break;
1929 case 'O':
1930 if (sscanf(optarg, "%o", &match_perms) == -1)
1931 match_bits = 0;
1932 break;
1933 case 'o': {
1934 if (freopen(optarg, "w", stdout) == NULL)
1935 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1936 break;
1937 }
1938 case 'k':
1939 xarraypush(find_section_arr, optarg, strlen(optarg));
1940 break;
1941 case 's': {
1942 if (find_sym) warn("You prob don't want to specify -s twice");
1943 find_sym = optarg;
1944 break;
1945 }
1946 case 'N':
1947 xarraypush(find_lib_arr, optarg, strlen(optarg));
1948 break;
1949 case 'F': {
1950 if (out_format) warn("You prob don't want to specify -F twice");
1951 out_format = optarg;
1952 break;
1953 }
1954 case 'z': {
1955 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1956 size_t x;
1957
1958 for (x = 0; x < strlen(optarg); x++) {
1959 switch (optarg[x]) {
1960 case 'p':
1961 case 'P':
1962 do_pax_state(optarg[x], PAGEEXEC);
1963 break;
1964 case 's':
1965 case 'S':
1966 do_pax_state(optarg[x], SEGMEXEC);
1967 break;
1968 case 'm':
1969 case 'M':
1970 do_pax_state(optarg[x], MPROTECT);
1971 break;
1972 case 'e':
1973 case 'E':
1974 do_pax_state(optarg[x], EMUTRAMP);
1975 break;
1976 case 'r':
1977 case 'R':
1978 do_pax_state(optarg[x], RANDMMAP);
1979 break;
1980 case 'x':
1981 case 'X':
1982 do_pax_state(optarg[x], RANDEXEC);
1983 break;
1984 default:
1985 break;
1986 }
1987 }
1988 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
1989 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
1990 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
1991 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
1992 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1993 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1994 setpax = flags;
1995 break;
1996 }
1997 case 'Z': show_size = 1; break;
1998 case 'g': g_match = 1; break;
1999 case 'L': use_ldcache = 1; break;
2000 case 'y': scan_symlink = 0; break;
2001 case 'A': scan_archives = 1; break;
2002 case 'C': color_init(true); break;
2003 case 'B': show_banner = 0; break;
2004 case 'l': scan_ldpath = 1; break;
2005 case 'p': scan_envpath = 1; break;
2006 case 'R': dir_recurse = 1; break;
2007 case 'm': dir_crossmount = 0; break;
2008 case 'X': ++fix_elf; break;
2009 case 'x': show_pax = 1; break;
2010 case 'e': show_phdr = 1; break;
2011 case 't': show_textrel = 1; break;
2012 case 'r': show_rpath = 1; break;
2013 case 'n': show_needed = 1; break;
2014 case 'i': show_interp = 1; break;
2015 case 'b': show_bind = 1; break;
2016 case 'S': show_soname = 1; break;
2017 case 'T': show_textrels = 1; break;
2018 case 'q': be_quiet = 1; break;
2019 case 'v': be_verbose = (be_verbose % 20) + 1; break;
2020 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
2021 case 'D': show_endian = 1; break;
2022 case 'I': show_osabi = 1; break;
2023 case 'Y': show_eabi = 1; break;
2024 case 128:
2025 root = optarg;
2026 break;
2027 case ':':
2028 err("Option '%c' is missing parameter", optopt);
2029 case '?':
2030 err("Unknown option '%c' or argument missing", optopt);
2031 default:
2032 err("Unhandled option '%c'; please report this", i);
2033 }
2034 }
2035 if (show_textrels && be_verbose) {
2036 if (which("objdump") != NULL)
2037 has_objdump = 1;
2038 }
2039 /* flatten arrays for display */
2040 if (array_cnt(find_lib_arr))
2041 find_lib = array_flatten_str(find_lib_arr);
2042 if (array_cnt(find_section_arr))
2043 find_section = array_flatten_str(find_section_arr);
2044 /* let the format option override all other options */
2045 if (out_format) {
2046 show_pax = show_phdr = show_textrel = show_rpath = \
2047 show_needed = show_interp = show_bind = show_soname = \
2048 show_textrels = show_perms = show_endian = show_size = \
2049 show_osabi = show_eabi = 0;
2050 for (i = 0; out_format[i]; ++i) {
2051 if (!IS_MODIFIER(out_format[i])) continue;
2052
2053 switch (out_format[++i]) {
2054 case '+': break;
2055 case '%': break;
2056 case '#': break;
2057 case 'F': break;
2058 case 'p': break;
2059 case 'f': break;
2060 case 'k': break;
2061 case 's': break;
2062 case 'N': break;
2063 case 'o': break;
2064 case 'a': break;
2065 case 'M': break;
2066 case 'Z': show_size = 1; break;
2067 case 'D': show_endian = 1; break;
2068 case 'I': show_osabi = 1; break;
2069 case 'Y': show_eabi = 1; break;
2070 case 'O': show_perms = 1; break;
2071 case 'x': show_pax = 1; break;
2072 case 'e': show_phdr = 1; break;
2073 case 't': show_textrel = 1; break;
2074 case 'r': show_rpath = 1; break;
2075 case 'n': show_needed = 1; break;
2076 case 'i': show_interp = 1; break;
2077 case 'b': show_bind = 1; break;
2078 case 'S': show_soname = 1; break;
2079 case 'T': show_textrels = 1; break;
2080 default:
2081 err("Invalid format specifier '%c' (byte %i)",
2082 out_format[i], i+1);
2083 }
2084 }
2085
2086 /* construct our default format */
2087 } else {
2088 size_t fmt_len = 30;
2089 out_format = xmalloc(sizeof(char) * fmt_len);
2090 *out_format = '\0';
2091 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
2092 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
2093 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
2094 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
2095 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
2096 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
2097 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
2098 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
2099 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
2100 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
2101 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
2102 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
2103 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
2104 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
2105 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
2106 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
2107 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
2108 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
2109 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
2110 }
2111 if (be_verbose > 2) printf("Format: %s\n", out_format);
2112
2113 /* now lets actually do the scanning */
2114 if (scan_ldpath || use_ldcache)
2115 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
2116 if (scan_ldpath) scanelf_ldpath();
2117 if (scan_envpath) scanelf_envpath();
2118 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
2119 from_file = "-";
2120 if (from_file) {
2121 scanelf_from_file(from_file);
2122 from_file = *argv;
2123 }
2124 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
2125 err("Nothing to scan !?");
2126 while (optind < argc) {
2127 search_path = argv[optind++];
2128 ret = scanelf_dir(search_path);
2129 }
2130
2131 /* clean up */
2132 xarrayfree(ldpaths);
2133 xarrayfree(find_lib_arr);
2134 xarrayfree(find_section_arr);
2135 free(find_lib);
2136 free(find_section);
2137
2138 if (ldcache != 0)
2139 munmap(ldcache, ldcache_size);
2140 return ret;
2141 }
2142
2143 static char **get_split_env(const char *envvar)
2144 {
2145 const char *delims = " \t\n";
2146 char **envvals = NULL;
2147 char *env, *s;
2148 int nentry;
2149
2150 if ((env = getenv(envvar)) == NULL)
2151 return NULL;
2152
2153 env = xstrdup(env);
2154 if (env == NULL)
2155 return NULL;
2156
2157 s = strtok(env, delims);
2158 if (s == NULL) {
2159 free(env);
2160 return NULL;
2161 }
2162
2163 nentry = 0;
2164 while (s != NULL) {
2165 ++nentry;
2166 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
2167 envvals[nentry-1] = s;
2168 s = strtok(NULL, delims);
2169 }
2170 envvals[nentry] = NULL;
2171
2172 /* don't want to free(env) as it contains the memory that backs
2173 * the envvals array of strings */
2174 return envvals;
2175 }
2176
2177 static void parseenv(void)
2178 {
2179 color_init(false);
2180 qa_textrels = get_split_env("QA_TEXTRELS");
2181 qa_execstack = get_split_env("QA_EXECSTACK");
2182 qa_wx_load = get_split_env("QA_WX_LOAD");
2183 }
2184
2185 #ifdef __PAX_UTILS_CLEANUP
2186 static void cleanup(void)
2187 {
2188 free(out_format);
2189 free(qa_textrels);
2190 free(qa_execstack);
2191 free(qa_wx_load);
2192 }
2193 #endif
2194
2195 int main(int argc, char *argv[])
2196 {
2197 int ret;
2198 if (argc < 2)
2199 usage(EXIT_FAILURE);
2200 parseenv();
2201 ret = parseargs(argc, argv);
2202 fclose(stdout);
2203 #ifdef __PAX_UTILS_CLEANUP
2204 cleanup();
2205 warn("The calls to add/delete heap should be off:\n"
2206 "\t- 1 due to the out_buffer not being freed in scanelf_file()\n"
2207 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
2208 #endif
2209 return ret;
2210 }
2211
2212 /* Match filename against entries in matchlist, return TRUE
2213 * if the file is listed */
2214 static int file_matches_list(const char *filename, char **matchlist)
2215 {
2216 char **file;
2217 char *match;
2218 char buf[__PAX_UTILS_PATH_MAX];
2219
2220 if (matchlist == NULL)
2221 return 0;
2222
2223 for (file = matchlist; *file != NULL; file++) {
2224 if (search_path) {
2225 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2226 match = buf;
2227 } else {
2228 match = *file;
2229 }
2230 if (fnmatch(match, filename, 0) == 0)
2231 return 1;
2232 }
2233 return 0;
2234 }

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