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Revision 1.213 - (show annotations) (download) (as text)
Tue Dec 1 10:18:58 2009 UTC (4 years, 10 months ago) by vapier
Branch: MAIN
Changes since 1.212: +22 -19 lines
File MIME type: text/x-csrc
unify some of the scanelf symtabs code paths

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 1.212 2009/03/15 09:13:20 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 1.212 2009/03/15 09:13:20 vapier Exp $";
11 const char * const 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 static int rematch(const char *regex, const char *match, int cflags);
31
32 /* variables to control behavior */
33 static char match_etypes[126] = "";
34 static char *ldpaths[256];
35 static char scan_ldpath = 0;
36 static char scan_envpath = 0;
37 static char scan_symlink = 1;
38 static char scan_archives = 0;
39 static char dir_recurse = 0;
40 static char dir_crossmount = 1;
41 static char show_pax = 0;
42 static char show_perms = 0;
43 static char show_size = 0;
44 static char show_phdr = 0;
45 static char show_textrel = 0;
46 static char show_rpath = 0;
47 static char show_needed = 0;
48 static char show_interp = 0;
49 static char show_bind = 0;
50 static char show_soname = 0;
51 static char show_textrels = 0;
52 static char show_banner = 1;
53 static char show_endian = 0;
54 static char show_osabi = 0;
55 static char show_eabi = 0;
56 static char be_quiet = 0;
57 static char be_verbose = 0;
58 static char be_wewy_wewy_quiet = 0;
59 static char be_semi_verbose = 0;
60 static char *find_sym = NULL;
61 static char *find_lib = NULL;
62 static char *find_section = NULL;
63 static char *out_format = NULL;
64 static char *search_path = NULL;
65 static char fix_elf = 0;
66 static char g_match = 0;
67 static char use_ldcache = 0;
68
69 static char **qa_textrels = NULL;
70 static char **qa_execstack = NULL;
71 static char **qa_wx_load = NULL;
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 > (void*)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->data + 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->data + 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->data + 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->data + EGET(symtab->sh_offset)); \
439 if ((void*)sym > (void*)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", (char*)(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->data + 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->data + 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 = (char*)(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->data + 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 = (char*)(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->data + 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->data + 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 = (char*)(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 static int scanelf_match_symname(const char *symname, const char *tomatch) {
983 /* We do things differently when checking with regexp */
984 if (g_match) {
985 return rematch(symname, tomatch, REG_EXTENDED) == 0;
986 } else {
987 const size_t symname_len = strlen(symname);
988 return (strncmp(symname, tomatch, symname_len) == 0 &&
989 /* Accept unversioned symbol names */
990 (tomatch[symname_len] == '\0' || tomatch[symname_len] == '@'));
991 }
992 }
993
994 static char *scanelf_file_sym(elfobj *elf, char *found_sym)
995 {
996 unsigned long i;
997 char *ret;
998 void *symtab_void, *strtab_void;
999
1000 if (!find_sym) return NULL;
1001 ret = find_sym;
1002
1003 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
1004
1005 if (symtab_void && strtab_void) {
1006 #define FIND_SYM(B) \
1007 if (elf->elf_class == ELFCLASS ## B) { \
1008 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
1009 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
1010 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
1011 unsigned long cnt = EGET(symtab->sh_entsize); \
1012 char *symname; \
1013 if (cnt) \
1014 cnt = EGET(symtab->sh_size) / cnt; \
1015 for (i = 0; i < cnt; ++i) { \
1016 if ((void*)sym > (void*)elf->data_end) { \
1017 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1018 goto break_out; \
1019 } \
1020 if (sym->st_name) { \
1021 /* make sure the symbol name is in acceptable memory range */ \
1022 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
1023 if ((void*)symname > (void*)elf->data_end) { \
1024 warnf("%s: corrupt ELF symbols", elf->filename); \
1025 ++sym; \
1026 continue; \
1027 } \
1028 /* debug display ... show all symbols and some extra info */ \
1029 if (0 && g_match ? rematch(ret, symname, REG_EXTENDED) == 0 : *ret == '*') { \
1030 printf("%s(%s) %5lX %15s %s %s\n", \
1031 ((*found_sym == 0) ? "\n\t" : "\t"), \
1032 elf->base_filename, \
1033 (unsigned long)sym->st_size, \
1034 get_elfstttype(sym->st_info), \
1035 sym->st_shndx == SHN_UNDEF ? "U" : "D", symname); \
1036 *found_sym = 1; \
1037 } else { \
1038 /* allow the user to specify a comma delimited list of symbols to search for */ \
1039 char *this_sym, *next_sym; \
1040 next_sym = ret; \
1041 while (next_sym) { \
1042 this_sym = next_sym; \
1043 if ((next_sym = strchr(this_sym, ','))) \
1044 next_sym += 1; /* Skip the comma */ \
1045 /* do we want a defined symbol ? */ \
1046 if (*this_sym == '+') { \
1047 if (sym->st_shndx == SHN_UNDEF) \
1048 continue; \
1049 ++this_sym; \
1050 /* do we want an undefined symbol ? */ \
1051 } else if (*this_sym == '-') { \
1052 if (sym->st_shndx != SHN_UNDEF) \
1053 continue; \
1054 ++this_sym; \
1055 } \
1056 if (next_sym) /* Copy it so that we don't have to worry about the final , */ \
1057 this_sym = xstrndup(this_sym, next_sym-this_sym); \
1058 /* ok, lets compare the name now */ \
1059 if (scanelf_match_symname(this_sym, symname)) { \
1060 if (be_semi_verbose) { \
1061 char buf[126]; \
1062 snprintf(buf, sizeof(buf), "%lX %s %s", \
1063 (unsigned long)sym->st_size, get_elfstttype(sym->st_info), this_sym); \
1064 ret = buf; \
1065 } else \
1066 ret = symname; \
1067 (*found_sym)++; \
1068 goto break_out; \
1069 } \
1070 if (next_sym) free(this_sym); \
1071 } \
1072 } \
1073 } \
1074 ++sym; \
1075 } }
1076 FIND_SYM(32)
1077 FIND_SYM(64)
1078 }
1079
1080 break_out:
1081 if (be_wewy_wewy_quiet) return NULL;
1082
1083 if (*find_sym != '*' && *found_sym)
1084 return ret;
1085 if (be_quiet)
1086 return NULL;
1087 else
1088 return (char *)" - ";
1089 }
1090
1091 static char *scanelf_file_sections(elfobj *elf, char *found_section)
1092 {
1093 if (!find_section)
1094 return NULL;
1095
1096 #define FIND_SECTION(B) \
1097 if (elf->elf_class == ELFCLASS ## B) { \
1098 int invert; \
1099 Elf ## B ## _Shdr *section; \
1100 invert = (*find_section == '!' ? 1 : 0); \
1101 section = SHDR ## B (elf_findsecbyname(elf, find_section+invert)); \
1102 if ((section == NULL && invert) || (section != NULL && !invert)) \
1103 *found_section = 1; \
1104 }
1105 FIND_SECTION(32)
1106 FIND_SECTION(64)
1107
1108 if (be_wewy_wewy_quiet)
1109 return NULL;
1110
1111 if (*found_section)
1112 return find_section;
1113
1114 if (be_quiet)
1115 return NULL;
1116 else
1117 return (char *)" - ";
1118 }
1119
1120 /* scan an elf file and show all the fun stuff */
1121 #define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
1122 static int scanelf_elfobj(elfobj *elf)
1123 {
1124 unsigned long i;
1125 char found_pax, found_phdr, found_relro, found_load, found_textrel,
1126 found_rpath, found_needed, found_interp, found_bind, found_soname,
1127 found_sym, found_lib, found_file, found_textrels, found_section;
1128 static char *out_buffer = NULL;
1129 static size_t out_len;
1130
1131 found_pax = found_phdr = found_relro = found_load = found_textrel = \
1132 found_rpath = found_needed = found_interp = found_bind = found_soname = \
1133 found_sym = found_lib = found_file = found_textrels = found_section = 0;
1134
1135 if (be_verbose > 2)
1136 printf("%s: scanning file {%s,%s}\n", elf->filename,
1137 get_elfeitype(EI_CLASS, elf->elf_class),
1138 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
1139 else if (be_verbose > 1)
1140 printf("%s: scanning file\n", elf->filename);
1141
1142 /* init output buffer */
1143 if (!out_buffer) {
1144 out_len = sizeof(char) * 80;
1145 out_buffer = xmalloc(out_len);
1146 }
1147 *out_buffer = '\0';
1148
1149 /* show the header */
1150 if (!be_quiet && show_banner) {
1151 for (i = 0; out_format[i]; ++i) {
1152 if (!IS_MODIFIER(out_format[i])) continue;
1153
1154 switch (out_format[++i]) {
1155 case '+': break;
1156 case '%': break;
1157 case '#': break;
1158 case 'F':
1159 case 'p':
1160 case 'f': prints("FILE "); found_file = 1; break;
1161 case 'o': prints(" TYPE "); break;
1162 case 'x': prints(" PAX "); break;
1163 case 'e': prints("STK/REL/PTL "); break;
1164 case 't': prints("TEXTREL "); break;
1165 case 'r': prints("RPATH "); break;
1166 case 'M': prints("CLASS "); break;
1167 case 'n': prints("NEEDED "); break;
1168 case 'i': prints("INTERP "); break;
1169 case 'b': prints("BIND "); break;
1170 case 'Z': prints("SIZE "); break;
1171 case 'S': prints("SONAME "); break;
1172 case 's': prints("SYM "); break;
1173 case 'N': prints("LIB "); break;
1174 case 'T': prints("TEXTRELS "); break;
1175 case 'k': prints("SECTION "); break;
1176 case 'a': prints("ARCH "); break;
1177 case 'I': prints("OSABI "); break;
1178 case 'Y': prints("EABI "); break;
1179 case 'O': prints("PERM "); break;
1180 case 'D': prints("ENDIAN "); break;
1181 default: warnf("'%c' has no title ?", out_format[i]);
1182 }
1183 }
1184 if (!found_file) prints("FILE ");
1185 prints("\n");
1186 found_file = 0;
1187 show_banner = 0;
1188 }
1189
1190 /* dump all the good stuff */
1191 for (i = 0; out_format[i]; ++i) {
1192 const char *out;
1193 const char *tmp;
1194 static char ubuf[sizeof(unsigned long)*2];
1195 if (!IS_MODIFIER(out_format[i])) {
1196 xchrcat(&out_buffer, out_format[i], &out_len);
1197 continue;
1198 }
1199
1200 out = NULL;
1201 be_wewy_wewy_quiet = (out_format[i] == '#');
1202 be_semi_verbose = (out_format[i] == '+');
1203 switch (out_format[++i]) {
1204 case '+':
1205 case '%':
1206 case '#':
1207 xchrcat(&out_buffer, out_format[i], &out_len); break;
1208 case 'F':
1209 found_file = 1;
1210 if (be_wewy_wewy_quiet) break;
1211 xstrcat(&out_buffer, elf->filename, &out_len);
1212 break;
1213 case 'p':
1214 found_file = 1;
1215 if (be_wewy_wewy_quiet) break;
1216 tmp = elf->filename;
1217 if (search_path) {
1218 ssize_t len_search = strlen(search_path);
1219 ssize_t len_file = strlen(elf->filename);
1220 if (!strncmp(elf->filename, search_path, len_search) && \
1221 len_file > len_search)
1222 tmp += len_search;
1223 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1224 }
1225 xstrcat(&out_buffer, tmp, &out_len);
1226 break;
1227 case 'f':
1228 found_file = 1;
1229 if (be_wewy_wewy_quiet) break;
1230 tmp = strrchr(elf->filename, '/');
1231 tmp = (tmp == NULL ? elf->filename : tmp+1);
1232 xstrcat(&out_buffer, tmp, &out_len);
1233 break;
1234 case 'o': out = get_elfetype(elf); break;
1235 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
1236 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
1237 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1238 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
1239 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1240 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1241 case 'D': out = get_endian(elf); break;
1242 case 'O': out = strfileperms(elf->filename); break;
1243 case 'n':
1244 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
1245 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1246 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1247 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
1248 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1249 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1250 case 'a': out = get_elfemtype(elf); break;
1251 case 'I': out = get_elfosabi(elf); break;
1252 case 'Y': out = get_elf_eabi(elf); break;
1253 case 'Z': snprintf(ubuf, sizeof(ubuf), "%lu", (unsigned long)elf->len); out = ubuf; break;;
1254 default: warnf("'%c' has no scan code?", out_format[i]);
1255 }
1256 if (out) {
1257 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
1258 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
1259 xstrncat(&out_buffer, out, &out_len, (tmp-out));
1260 else
1261 xstrcat(&out_buffer, out, &out_len);
1262 }
1263 }
1264
1265 #define FOUND_SOMETHING() \
1266 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1267 found_rpath || found_needed || found_interp || found_bind || \
1268 found_soname || found_sym || found_lib || found_textrels || found_section )
1269
1270 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1271 xchrcat(&out_buffer, ' ', &out_len);
1272 xstrcat(&out_buffer, elf->filename, &out_len);
1273 }
1274 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
1275 puts(out_buffer);
1276 fflush(stdout);
1277 }
1278
1279 return 0;
1280 }
1281
1282 /* scan a single elf */
1283 static int scanelf_elf(const char *filename, int fd, size_t len)
1284 {
1285 int ret = 1;
1286 elfobj *elf;
1287
1288 /* verify this is real ELF */
1289 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1290 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1291 return ret;
1292 }
1293 switch (match_bits) {
1294 case 32:
1295 if (elf->elf_class != ELFCLASS32)
1296 goto label_done;
1297 break;
1298 case 64:
1299 if (elf->elf_class != ELFCLASS64)
1300 goto label_done;
1301 break;
1302 default: break;
1303 }
1304 if (strlen(match_etypes)) {
1305 char sbuf[126];
1306 strncpy(sbuf, match_etypes, sizeof(sbuf));
1307 if (strchr(match_etypes, ',') != NULL) {
1308 char *p;
1309 while ((p = strrchr(sbuf, ',')) != NULL) {
1310 *p = 0;
1311 if (etype_lookup(p+1) == get_etype(elf))
1312 goto label_ret;
1313 }
1314 }
1315 if (etype_lookup(sbuf) != get_etype(elf))
1316 goto label_done;
1317 }
1318
1319 label_ret:
1320 ret = scanelf_elfobj(elf);
1321
1322 label_done:
1323 unreadelf(elf);
1324 return ret;
1325 }
1326
1327 /* scan an archive of elfs */
1328 static int scanelf_archive(const char *filename, int fd, size_t len)
1329 {
1330 archive_handle *ar;
1331 archive_member *m;
1332 char *ar_buffer;
1333 elfobj *elf;
1334
1335 ar = ar_open_fd(filename, fd);
1336 if (ar == NULL)
1337 return 1;
1338
1339 ar_buffer = mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1340 while ((m=ar_next(ar)) != NULL) {
1341 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size);
1342 if (elf) {
1343 scanelf_elfobj(elf);
1344 unreadelf(elf);
1345 }
1346 }
1347 munmap(ar_buffer, len);
1348
1349 return 0;
1350 }
1351 /* scan a file which may be an elf or an archive or some other magical beast */
1352 static int scanelf_file(const char *filename, const struct stat *st_cache)
1353 {
1354 const struct stat *st = st_cache;
1355 struct stat symlink_st;
1356 int fd;
1357
1358 /* always handle regular files and handle symlinked files if no -y */
1359 if (S_ISLNK(st->st_mode)) {
1360 if (!scan_symlink) return 1;
1361 stat(filename, &symlink_st);
1362 st = &symlink_st;
1363 }
1364
1365 if (!S_ISREG(st->st_mode)) {
1366 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1367 return 1;
1368 }
1369
1370 if (match_perms) {
1371 if ((st->st_mode | match_perms) != st->st_mode)
1372 return 1;
1373 }
1374 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1375 return 1;
1376
1377 if (scanelf_elf(filename, fd, st->st_size) == 1 && scan_archives)
1378 /* if it isn't an ELF, maybe it's an .a archive */
1379 scanelf_archive(filename, fd, st->st_size);
1380
1381 close(fd);
1382 return 0;
1383 }
1384
1385 /* scan a directory for ET_EXEC files and print when we find one */
1386 static int scanelf_dir(const char *path)
1387 {
1388 register DIR *dir;
1389 register struct dirent *dentry;
1390 struct stat st_top, st;
1391 char buf[__PAX_UTILS_PATH_MAX];
1392 size_t pathlen = 0, len = 0;
1393 int ret = 0;
1394
1395 /* make sure path exists */
1396 if (lstat(path, &st_top) == -1) {
1397 if (be_verbose > 2) printf("%s: does not exist\n", path);
1398 return 1;
1399 }
1400
1401 /* ok, if it isn't a directory, assume we can open it */
1402 if (!S_ISDIR(st_top.st_mode)) {
1403 return scanelf_file(path, &st_top);
1404 }
1405
1406 /* now scan the dir looking for fun stuff */
1407 if ((dir = opendir(path)) == NULL) {
1408 warnf("could not opendir %s: %s", path, strerror(errno));
1409 return 1;
1410 }
1411 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1412
1413 pathlen = strlen(path);
1414 while ((dentry = readdir(dir))) {
1415 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1416 continue;
1417 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
1418 if (len >= sizeof(buf)) {
1419 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1420 (unsigned long)len, (unsigned long)sizeof(buf));
1421 continue;
1422 }
1423 snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name);
1424 if (lstat(buf, &st) != -1) {
1425 if (S_ISREG(st.st_mode))
1426 ret = scanelf_file(buf, &st);
1427 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1428 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1429 ret = scanelf_dir(buf);
1430 }
1431 }
1432 }
1433 closedir(dir);
1434 return ret;
1435 }
1436
1437 static int scanelf_from_file(const char *filename)
1438 {
1439 FILE *fp = NULL;
1440 char *p;
1441 char path[__PAX_UTILS_PATH_MAX];
1442 int ret = 0;
1443
1444 if (strcmp(filename, "-") == 0)
1445 fp = stdin;
1446 else if ((fp = fopen(filename, "r")) == NULL)
1447 return 1;
1448
1449 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1450 if ((p = strchr(path, '\n')) != NULL)
1451 *p = 0;
1452 search_path = path;
1453 ret = scanelf_dir(path);
1454 }
1455 if (fp != stdin)
1456 fclose(fp);
1457 return ret;
1458 }
1459
1460 #if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1461
1462 static int load_ld_cache_config(int i, const char *fname)
1463 {
1464 FILE *fp = NULL;
1465 char *p;
1466 char path[__PAX_UTILS_PATH_MAX];
1467
1468 if (i + 1 == ARRAY_SIZE(ldpaths))
1469 return i;
1470
1471 if ((fp = fopen(fname, "r")) == NULL)
1472 return i;
1473
1474 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1475 if ((p = strrchr(path, '\r')) != NULL)
1476 *p = 0;
1477 if ((p = strchr(path, '\n')) != NULL)
1478 *p = 0;
1479 #ifdef __linux__
1480 /* recursive includes of the same file will make this segfault. */
1481 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1482 glob64_t gl;
1483 size_t x;
1484 char gpath[__PAX_UTILS_PATH_MAX];
1485
1486 memset(gpath, 0, sizeof(gpath));
1487
1488 if (path[8] != '/')
1489 snprintf(gpath, sizeof(gpath), "/etc/%s", &path[8]);
1490 else
1491 strncpy(gpath, &path[8], sizeof(gpath));
1492
1493 if ((glob64(gpath, 0, NULL, &gl)) == 0) {
1494 for (x = 0; x < gl.gl_pathc; ++x) {
1495 /* try to avoid direct loops */
1496 if (strcmp(gl.gl_pathv[x], fname) == 0)
1497 continue;
1498 i = load_ld_cache_config(i, gl.gl_pathv[x]);
1499 if (i + 1 >= ARRAY_SIZE(ldpaths)) {
1500 globfree64(&gl);
1501 return i;
1502 }
1503 }
1504 globfree64 (&gl);
1505 continue;
1506 }
1507 }
1508 #endif
1509 if (*path != '/')
1510 continue;
1511
1512 ldpaths[i++] = xstrdup(path);
1513
1514 if (i + 1 == ARRAY_SIZE(ldpaths))
1515 break;
1516 }
1517 ldpaths[i] = NULL;
1518
1519 fclose(fp);
1520 return i;
1521 }
1522
1523 #elif defined(__FreeBSD__) || defined(__DragonFly__)
1524
1525 static int load_ld_cache_config(int i, const char *fname)
1526 {
1527 FILE *fp = NULL;
1528 char *b = NULL, *p;
1529 struct elfhints_hdr hdr;
1530
1531 if (i + 1 == ARRAY_SIZE(ldpaths))
1532 return i;
1533
1534 if ((fp = fopen(fname, "r")) == NULL)
1535 return i;
1536
1537 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1538 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1539 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1540 {
1541 fclose(fp);
1542 return i;
1543 }
1544
1545 b = xmalloc(hdr.dirlistlen + 1);
1546 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1547 fclose(fp);
1548 free(b);
1549 return i;
1550 }
1551
1552 while ((p = strsep(&b, ":"))) {
1553 if (*p == '\0') continue;
1554 ldpaths[i++] = xstrdup(p);
1555
1556 if (i + 1 == ARRAY_SIZE(ldpaths))
1557 break;
1558 }
1559 ldpaths[i] = NULL;
1560
1561 free(b);
1562 fclose(fp);
1563 return i;
1564 }
1565
1566 #else
1567 #ifdef __ELF__
1568 #warning Cache config support not implemented for your target
1569 #endif
1570 static int load_ld_cache_config(int i, const char *fname)
1571 {
1572 memset(ldpaths, 0x00, sizeof(ldpaths));
1573 return 0;
1574 }
1575 #endif
1576
1577 /* scan /etc/ld.so.conf for paths */
1578 static void scanelf_ldpath(void)
1579 {
1580 char scan_l, scan_ul, scan_ull;
1581 int i = 0;
1582
1583 if (!ldpaths[0])
1584 err("Unable to load any paths from ld.so.conf");
1585
1586 scan_l = scan_ul = scan_ull = 0;
1587
1588 while (ldpaths[i]) {
1589 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
1590 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
1591 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
1592 scanelf_dir(ldpaths[i]);
1593 ++i;
1594 }
1595
1596 if (!scan_l) scanelf_dir("/lib");
1597 if (!scan_ul) scanelf_dir("/usr/lib");
1598 if (!scan_ull) scanelf_dir("/usr/local/lib");
1599 }
1600
1601 /* scan env PATH for paths */
1602 static void scanelf_envpath(void)
1603 {
1604 char *path, *p;
1605
1606 path = getenv("PATH");
1607 if (!path)
1608 err("PATH is not set in your env !");
1609 path = xstrdup(path);
1610
1611 while ((p = strrchr(path, ':')) != NULL) {
1612 scanelf_dir(p + 1);
1613 *p = 0;
1614 }
1615
1616 free(path);
1617 }
1618
1619 /* usage / invocation handling functions */ /* Free Flags: c d j u w C G H J K P Q U W */
1620 #define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZBhV"
1621 #define a_argument required_argument
1622 static struct option const long_opts[] = {
1623 {"path", no_argument, NULL, 'p'},
1624 {"ldpath", no_argument, NULL, 'l'},
1625 {"recursive", no_argument, NULL, 'R'},
1626 {"mount", no_argument, NULL, 'm'},
1627 {"symlink", no_argument, NULL, 'y'},
1628 {"archives", no_argument, NULL, 'A'},
1629 {"ldcache", no_argument, NULL, 'L'},
1630 {"fix", no_argument, NULL, 'X'},
1631 {"setpax", a_argument, NULL, 'z'},
1632 {"pax", no_argument, NULL, 'x'},
1633 {"header", no_argument, NULL, 'e'},
1634 {"textrel", no_argument, NULL, 't'},
1635 {"rpath", no_argument, NULL, 'r'},
1636 {"needed", no_argument, NULL, 'n'},
1637 {"interp", no_argument, NULL, 'i'},
1638 {"bind", no_argument, NULL, 'b'},
1639 {"soname", no_argument, NULL, 'S'},
1640 {"symbol", a_argument, NULL, 's'},
1641 {"section", a_argument, NULL, 'k'},
1642 {"lib", a_argument, NULL, 'N'},
1643 {"gmatch", no_argument, NULL, 'g'},
1644 {"textrels", no_argument, NULL, 'T'},
1645 {"etype", a_argument, NULL, 'E'},
1646 {"bits", a_argument, NULL, 'M'},
1647 {"endian", no_argument, NULL, 'D'},
1648 {"osabi", no_argument, NULL, 'I'},
1649 {"eabi", no_argument, NULL, 'Y'},
1650 {"perms", a_argument, NULL, 'O'},
1651 {"size", no_argument, NULL, 'Z'},
1652 {"all", no_argument, NULL, 'a'},
1653 {"quiet", no_argument, NULL, 'q'},
1654 {"verbose", no_argument, NULL, 'v'},
1655 {"format", a_argument, NULL, 'F'},
1656 {"from", a_argument, NULL, 'f'},
1657 {"file", a_argument, NULL, 'o'},
1658 {"nobanner", no_argument, NULL, 'B'},
1659 {"help", no_argument, NULL, 'h'},
1660 {"version", no_argument, NULL, 'V'},
1661 {NULL, no_argument, NULL, 0x0}
1662 };
1663
1664 static const char *opts_help[] = {
1665 "Scan all directories in PATH environment",
1666 "Scan all directories in /etc/ld.so.conf",
1667 "Scan directories recursively",
1668 "Don't recursively cross mount points",
1669 "Don't scan symlinks",
1670 "Scan archives (.a files)",
1671 "Utilize ld.so.cache information (use with -r/-n)",
1672 "Try and 'fix' bad things (use with -r/-e)",
1673 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1674 "Print PaX markings",
1675 "Print GNU_STACK/PT_LOAD markings",
1676 "Print TEXTREL information",
1677 "Print RPATH information",
1678 "Print NEEDED information",
1679 "Print INTERP information",
1680 "Print BIND information",
1681 "Print SONAME information",
1682 "Find a specified symbol",
1683 "Find a specified section",
1684 "Find a specified library",
1685 "Use strncmp to match libraries. (use with -N)",
1686 "Locate cause of TEXTREL",
1687 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1688 "Print only ELF files matching numeric bits",
1689 "Print Endianness",
1690 "Print OSABI",
1691 "Print EABI (EM_ARM Only)",
1692 "Print only ELF files matching octal permissions",
1693 "Print ELF file size",
1694 "Print all scanned info (-x -e -t -r -b)\n",
1695 "Only output 'bad' things",
1696 "Be verbose (can be specified more than once)",
1697 "Use specified format for output",
1698 "Read input stream from a filename",
1699 "Write output stream to a filename",
1700 "Don't display the header",
1701 "Print this help and exit",
1702 "Print version and exit",
1703 NULL
1704 };
1705
1706 /* display usage and exit */
1707 static void usage(int status)
1708 {
1709 unsigned long i;
1710 printf("* Scan ELF binaries for stuff\n\n"
1711 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1712 printf("Options: -[%s]\n", PARSE_FLAGS);
1713 for (i = 0; long_opts[i].name; ++i)
1714 if (long_opts[i].has_arg == no_argument)
1715 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
1716 long_opts[i].name, opts_help[i]);
1717 else
1718 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
1719 long_opts[i].name, opts_help[i]);
1720
1721 puts("\nFor more information, see the scanelf(1) manpage");
1722 exit(status);
1723 }
1724
1725 /* parse command line arguments and preform needed actions */
1726 #define do_pax_state(option, flag) \
1727 if (islower(option)) { \
1728 flags &= ~PF_##flag; \
1729 flags |= PF_NO##flag; \
1730 } else { \
1731 flags &= ~PF_NO##flag; \
1732 flags |= PF_##flag; \
1733 }
1734 static int parseargs(int argc, char *argv[])
1735 {
1736 int i;
1737 const char *from_file = NULL;
1738 int ret = 0;
1739
1740 opterr = 0;
1741 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1742 switch (i) {
1743
1744 case 'V':
1745 printf("pax-utils-%s: %s compiled %s\n%s\n"
1746 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
1747 VERSION, __FILE__, __DATE__, rcsid, argv0);
1748 exit(EXIT_SUCCESS);
1749 break;
1750 case 'h': usage(EXIT_SUCCESS); break;
1751 case 'f':
1752 if (from_file) warn("You prob don't want to specify -f twice");
1753 from_file = optarg;
1754 break;
1755 case 'E':
1756 strncpy(match_etypes, optarg, sizeof(match_etypes));
1757 break;
1758 case 'M':
1759 match_bits = atoi(optarg);
1760 if (match_bits == 0) {
1761 if (strcmp(optarg, "ELFCLASS32") == 0)
1762 match_bits = 32;
1763 if (strcmp(optarg, "ELFCLASS64") == 0)
1764 match_bits = 64;
1765 }
1766 break;
1767 case 'O':
1768 if (sscanf(optarg, "%o", &match_perms) == -1)
1769 match_bits = 0;
1770 break;
1771 case 'o': {
1772 if (freopen(optarg, "w", stdout) == NULL)
1773 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1774 break;
1775 }
1776 case 'k':
1777 if (find_section) warn("You prob don't want to specify -k twice");
1778 find_section = optarg;
1779 break;
1780 case 's': {
1781 if (find_sym) warn("You prob don't want to specify -s twice");
1782 find_sym = optarg;
1783 break;
1784 }
1785 case 'N': {
1786 if (find_lib) warn("You prob don't want to specify -N twice");
1787 find_lib = optarg;
1788 break;
1789 }
1790
1791 case 'F': {
1792 if (out_format) warn("You prob don't want to specify -F twice");
1793 out_format = optarg;
1794 break;
1795 }
1796 case 'z': {
1797 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1798 size_t x;
1799
1800 for (x = 0; x < strlen(optarg); x++) {
1801 switch (optarg[x]) {
1802 case 'p':
1803 case 'P':
1804 do_pax_state(optarg[x], PAGEEXEC);
1805 break;
1806 case 's':
1807 case 'S':
1808 do_pax_state(optarg[x], SEGMEXEC);
1809 break;
1810 case 'm':
1811 case 'M':
1812 do_pax_state(optarg[x], MPROTECT);
1813 break;
1814 case 'e':
1815 case 'E':
1816 do_pax_state(optarg[x], EMUTRAMP);
1817 break;
1818 case 'r':
1819 case 'R':
1820 do_pax_state(optarg[x], RANDMMAP);
1821 break;
1822 case 'x':
1823 case 'X':
1824 do_pax_state(optarg[x], RANDEXEC);
1825 break;
1826 default:
1827 break;
1828 }
1829 }
1830 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
1831 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
1832 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
1833 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
1834 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1835 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1836 setpax = flags;
1837 break;
1838 }
1839 case 'Z': show_size = 1; break;
1840 case 'g': g_match = 1; break;
1841 case 'L': use_ldcache = 1; break;
1842 case 'y': scan_symlink = 0; break;
1843 case 'A': scan_archives = 1; break;
1844 case 'B': show_banner = 0; break;
1845 case 'l': scan_ldpath = 1; break;
1846 case 'p': scan_envpath = 1; break;
1847 case 'R': dir_recurse = 1; break;
1848 case 'm': dir_crossmount = 0; break;
1849 case 'X': ++fix_elf; break;
1850 case 'x': show_pax = 1; break;
1851 case 'e': show_phdr = 1; break;
1852 case 't': show_textrel = 1; break;
1853 case 'r': show_rpath = 1; break;
1854 case 'n': show_needed = 1; break;
1855 case 'i': show_interp = 1; break;
1856 case 'b': show_bind = 1; break;
1857 case 'S': show_soname = 1; break;
1858 case 'T': show_textrels = 1; break;
1859 case 'q': be_quiet = 1; break;
1860 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1861 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
1862 case 'D': show_endian = 1; break;
1863 case 'I': show_osabi = 1; break;
1864 case 'Y': show_eabi = 1; break;
1865 case ':':
1866 err("Option '%c' is missing parameter", optopt);
1867 case '?':
1868 err("Unknown option '%c' or argument missing", optopt);
1869 default:
1870 err("Unhandled option '%c'; please report this", i);
1871 }
1872 }
1873 if (show_textrels && be_verbose) {
1874 if (which("objdump") != NULL)
1875 has_objdump = 1;
1876 }
1877 /* let the format option override all other options */
1878 if (out_format) {
1879 show_pax = show_phdr = show_textrel = show_rpath = \
1880 show_needed = show_interp = show_bind = show_soname = \
1881 show_textrels = show_perms = show_endian = show_size = \
1882 show_osabi = show_eabi = 0;
1883 for (i = 0; out_format[i]; ++i) {
1884 if (!IS_MODIFIER(out_format[i])) continue;
1885
1886 switch (out_format[++i]) {
1887 case '+': break;
1888 case '%': break;
1889 case '#': break;
1890 case 'F': break;
1891 case 'p': break;
1892 case 'f': break;
1893 case 'k': break;
1894 case 's': break;
1895 case 'N': break;
1896 case 'o': break;
1897 case 'a': break;
1898 case 'M': break;
1899 case 'Z': show_size = 1; break;
1900 case 'D': show_endian = 1; break;
1901 case 'I': show_osabi = 1; break;
1902 case 'Y': show_eabi = 1; break;
1903 case 'O': show_perms = 1; break;
1904 case 'x': show_pax = 1; break;
1905 case 'e': show_phdr = 1; break;
1906 case 't': show_textrel = 1; break;
1907 case 'r': show_rpath = 1; break;
1908 case 'n': show_needed = 1; break;
1909 case 'i': show_interp = 1; break;
1910 case 'b': show_bind = 1; break;
1911 case 'S': show_soname = 1; break;
1912 case 'T': show_textrels = 1; break;
1913 default:
1914 err("Invalid format specifier '%c' (byte %i)",
1915 out_format[i], i+1);
1916 }
1917 }
1918
1919 /* construct our default format */
1920 } else {
1921 size_t fmt_len = 30;
1922 out_format = xmalloc(sizeof(char) * fmt_len);
1923 *out_format = '\0';
1924 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1925 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1926 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
1927 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
1928 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
1929 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
1930 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
1931 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1932 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1933 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1934 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1935 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1936 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1937 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1938 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1939 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1940 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1941 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1942 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1943 }
1944 if (be_verbose > 2) printf("Format: %s\n", out_format);
1945
1946 /* now lets actually do the scanning */
1947 if (scan_ldpath || use_ldcache)
1948 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
1949 if (scan_ldpath) scanelf_ldpath();
1950 if (scan_envpath) scanelf_envpath();
1951 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
1952 from_file = "-";
1953 if (from_file) {
1954 scanelf_from_file(from_file);
1955 from_file = *argv;
1956 }
1957 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1958 err("Nothing to scan !?");
1959 while (optind < argc) {
1960 search_path = argv[optind++];
1961 ret = scanelf_dir(search_path);
1962 }
1963
1964 /* clean up */
1965 for (i = 0; ldpaths[i]; ++i)
1966 free(ldpaths[i]);
1967
1968 if (ldcache != 0)
1969 munmap(ldcache, ldcache_size);
1970 return ret;
1971 }
1972
1973 static char **get_split_env(const char *envvar)
1974 {
1975 const char *delims = " \t\n";
1976 char **envvals = NULL;
1977 char *env, *s;
1978 int nentry;
1979
1980 if ((env = getenv(envvar)) == NULL)
1981 return NULL;
1982
1983 env = xstrdup(env);
1984 if (env == NULL)
1985 return NULL;
1986
1987 s = strtok(env, delims);
1988 if (s == NULL) {
1989 free(env);
1990 return NULL;
1991 }
1992
1993 nentry = 0;
1994 while (s != NULL) {
1995 ++nentry;
1996 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
1997 envvals[nentry-1] = s;
1998 s = strtok(NULL, delims);
1999 }
2000 envvals[nentry] = NULL;
2001
2002 /* don't want to free(env) as it contains the memory that backs
2003 * the envvals array of strings */
2004 return envvals;
2005 }
2006
2007 static void parseenv(void)
2008 {
2009 qa_textrels = get_split_env("QA_TEXTRELS");
2010 qa_execstack = get_split_env("QA_EXECSTACK");
2011 qa_wx_load = get_split_env("QA_WX_LOAD");
2012 }
2013
2014 #ifdef __PAX_UTILS_CLEANUP
2015 static void cleanup(void)
2016 {
2017 free(out_format);
2018 free(qa_textrels);
2019 free(qa_execstack);
2020 free(qa_wx_load);
2021 }
2022 #endif
2023
2024 int main(int argc, char *argv[])
2025 {
2026 int ret;
2027 if (argc < 2)
2028 usage(EXIT_FAILURE);
2029 parseenv();
2030 ret = parseargs(argc, argv);
2031 fclose(stdout);
2032 #ifdef __PAX_UTILS_CLEANUP
2033 cleanup();
2034 warn("The calls to add/delete heap should be off:\n"
2035 "\t- 1 due to the out_buffer not being freed in scanelf_file()\n"
2036 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
2037 #endif
2038 return ret;
2039 }
2040
2041 /* Match filename against entries in matchlist, return TRUE
2042 * if the file is listed */
2043 static int file_matches_list(const char *filename, char **matchlist)
2044 {
2045 char **file;
2046 char *match;
2047 char buf[__PAX_UTILS_PATH_MAX];
2048
2049 if (matchlist == NULL)
2050 return 0;
2051
2052 for (file = matchlist; *file != NULL; file++) {
2053 if (search_path) {
2054 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2055 match = buf;
2056 } else {
2057 match = *file;
2058 }
2059 if (fnmatch(match, filename, 0) == 0)
2060 return 1;
2061 }
2062 return 0;
2063 }

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