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Revision 1.174 - (show annotations) (download) (as text)
Thu Jan 18 08:12:55 2007 UTC (7 years, 5 months ago) by solar
Branch: MAIN
Changes since 1.173: +31 -4 lines
File MIME type: text/x-csrc
- added regexp symbol matching using existing gmatch option

1 /*
2 * Copyright 2003-2006 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 1.173 2007/01/18 00:26:34 vapier Exp $
5 *
6 * Copyright 2003-2006 Ned Ludd - <solar@gentoo.org>
7 * Copyright 2004-2006 Mike Frysinger - <vapier@gentoo.org>
8 */
9
10 #include "paxinc.h"
11
12 static const char *rcsid = "$Id: scanelf.c,v 1.173 2007/01/18 00:26:34 vapier Exp $";
13 #define argv0 "scanelf"
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 char *xstrdup(const char *s);
31 static void *xmalloc(size_t size);
32 static void *xrealloc(void *ptr, size_t size);
33 static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n);
34 #define xstrcat(dst,src,curr_len) xstrncat(dst,src,curr_len,0)
35 static inline void xchrcat(char **dst, const char append, size_t *curr_len);
36 static int rematch(const char *regex, const char *match, int cflags);
37
38 /* variables to control behavior */
39 static char match_etypes[126] = "";
40 static char *ldpaths[256];
41 static char scan_ldpath = 0;
42 static char scan_envpath = 0;
43 static char scan_symlink = 1;
44 static char scan_archives = 0;
45 static char dir_recurse = 0;
46 static char dir_crossmount = 1;
47 static char show_pax = 0;
48 static char show_phdr = 0;
49 static char show_textrel = 0;
50 static char show_rpath = 0;
51 static char show_needed = 0;
52 static char show_interp = 0;
53 static char show_bind = 0;
54 static char show_soname = 0;
55 static char show_textrels = 0;
56 static char show_banner = 1;
57 static char be_quiet = 0;
58 static char be_verbose = 0;
59 static char be_wewy_wewy_quiet = 0;
60 static char be_semi_verbose = 0;
61 static char *find_sym = NULL, *versioned_symname = NULL;
62 static char *find_lib = NULL;
63 static char *find_section = NULL;
64 static char *out_format = NULL;
65 static char *search_path = NULL;
66 static char fix_elf = 0;
67 static char gmatch = 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
74 int match_bits = 0;
75 caddr_t ldcache = 0;
76 size_t ldcache_size = 0;
77 unsigned long setpax = 0UL;
78
79 int has_objdump = 0;
80 /* find the path to a file by name */
81 static char *which(const char *fname)
82 {
83 static char fullpath[BUFSIZ];
84 char *path, *p;
85
86 path = getenv("PATH");
87 if (!path)
88 return NULL;
89
90 path = xstrdup(path);
91 while ((p = strrchr(path, ':')) != NULL) {
92 snprintf(fullpath, sizeof(fullpath), "%s/%s", p + 1, fname);
93 *p = 0;
94 if (access(fullpath, R_OK) != (-1)) {
95 free(path);
96 return (char *) fullpath;
97 }
98 }
99 free(path);
100 return NULL;
101 }
102
103 /* 1 on failue. 0 otherwise */
104 static int rematch(const char *regex, const char *match, int cflags)
105 {
106 regex_t preg;
107 int ret;
108
109 if ((match == NULL) || (regex == NULL))
110 return EXIT_FAILURE;
111
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 #define GET_SYMTABS(B) \
134 if (elf->elf_class == ELFCLASS ## B) { \
135 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
136 /* debug sections */ \
137 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
138 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
139 /* runtime sections */ \
140 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
141 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
142 if (symtab && dynsym) { \
143 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \
144 } else { \
145 *sym = (void*)(symtab ? symtab : dynsym); \
146 } \
147 if (strtab && dynstr) { \
148 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \
149 } else { \
150 *tab = (void*)(strtab ? strtab : dynstr); \
151 } \
152 }
153 GET_SYMTABS(32)
154 GET_SYMTABS(64)
155 }
156
157 static char *scanelf_file_pax(elfobj *elf, char *found_pax)
158 {
159 static char ret[7];
160 unsigned long i, shown;
161
162 if (!show_pax) return NULL;
163
164 shown = 0;
165 memset(&ret, 0, sizeof(ret));
166
167 if (elf->phdr) {
168 #define SHOW_PAX(B) \
169 if (elf->elf_class == ELFCLASS ## B) { \
170 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
171 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
172 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
173 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
174 continue; \
175 if (fix_elf && setpax) { \
176 /* set the paxctl flags */ \
177 ESET(phdr[i].p_flags, setpax); \
178 } \
179 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
180 continue; \
181 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
182 *found_pax = 1; \
183 ++shown; \
184 break; \
185 } \
186 }
187 SHOW_PAX(32)
188 SHOW_PAX(64)
189 }
190
191
192 if (fix_elf && setpax) {
193 /* set the chpax settings */
194 if (elf->elf_class == ELFCLASS32) {
195 if (EHDR32(elf->ehdr)->e_type == ET_DYN || EHDR32(elf->ehdr)->e_type == ET_EXEC)
196 ESET(EHDR32(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
197 } else {
198 if (EHDR64(elf->ehdr)->e_type == ET_DYN || EHDR64(elf->ehdr)->e_type == ET_EXEC)
199 ESET(EHDR64(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
200 }
201 }
202
203 /* fall back to EI_PAX if no PT_PAX was found */
204 if (!*ret) {
205 static char *paxflags;
206 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
207 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
208 *found_pax = 1;
209 return (be_wewy_wewy_quiet ? NULL : paxflags);
210 }
211 strncpy(ret, paxflags, sizeof(ret));
212 }
213
214 if (be_wewy_wewy_quiet || (be_quiet && !shown))
215 return NULL;
216 else
217 return ret;
218 }
219
220 static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
221 {
222 static char ret[12];
223 char *found;
224 unsigned long i, shown, multi_stack, multi_relro, multi_load;
225 int max_pt_load;
226
227 if (!show_phdr) return NULL;
228
229 memcpy(ret, "--- --- ---\0", 12);
230
231 shown = 0;
232 multi_stack = multi_relro = multi_load = 0;
233 max_pt_load = elf_max_pt_load(elf);
234
235 #define NOTE_GNU_STACK ".note.GNU-stack"
236 #define SHOW_PHDR(B) \
237 if (elf->elf_class == ELFCLASS ## B) { \
238 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
239 Elf ## B ## _Off offset; \
240 uint32_t flags, check_flags; \
241 if (elf->phdr != NULL) { \
242 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
243 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
244 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
245 if (multi_stack++) \
246 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
247 if (file_matches_list(elf->filename, qa_execstack)) \
248 continue; \
249 found = found_phdr; \
250 offset = 0; \
251 check_flags = PF_X; \
252 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
253 if (multi_relro++) \
254 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
255 found = found_relro; \
256 offset = 4; \
257 check_flags = PF_X; \
258 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
259 if (ehdr->e_type == ET_DYN || ehdr->e_type == ET_EXEC) \
260 if (multi_load++ > max_pt_load) \
261 warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
262 if (file_matches_list(elf->filename, qa_wx_load)) \
263 continue; \
264 found = found_load; \
265 offset = 8; \
266 check_flags = PF_W|PF_X; \
267 } else \
268 continue; \
269 flags = EGET(phdr[i].p_flags); \
270 if (be_quiet && ((flags & check_flags) != check_flags)) \
271 continue; \
272 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
273 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
274 ret[3] = ret[7] = '!'; \
275 flags = EGET(phdr[i].p_flags); \
276 } \
277 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
278 *found = 1; \
279 ++shown; \
280 } \
281 } else if (elf->shdr != NULL) { \
282 /* no program headers which means this is prob an object file */ \
283 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
284 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
285 char *str; \
286 if ((void*)strtbl > (void*)elf->data_end) \
287 goto skip_this_shdr##B; \
288 check_flags = SHF_WRITE|SHF_EXECINSTR; \
289 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
290 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
291 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
292 str = elf->data + offset; \
293 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
294 if (!strcmp(str, NOTE_GNU_STACK)) { \
295 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
296 flags = EGET(shdr[i].sh_flags); \
297 if (be_quiet && ((flags & check_flags) != check_flags)) \
298 continue; \
299 ++*found_phdr; \
300 shown = 1; \
301 if (flags & SHF_WRITE) ret[0] = 'W'; \
302 if (flags & SHF_ALLOC) ret[1] = 'A'; \
303 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
304 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
305 break; \
306 } \
307 } \
308 skip_this_shdr##B: \
309 if (!multi_stack) { \
310 if (file_matches_list(elf->filename, qa_execstack)) \
311 return NULL; \
312 *found_phdr = 1; \
313 shown = 1; \
314 memcpy(ret, "!WX", 3); \
315 } \
316 } \
317 }
318 SHOW_PHDR(32)
319 SHOW_PHDR(64)
320
321 if (be_wewy_wewy_quiet || (be_quiet && !shown))
322 return NULL;
323 else
324 return ret;
325 }
326
327 static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
328 {
329 static const char *ret = "TEXTREL";
330 unsigned long i;
331
332 if (!show_textrel && !show_textrels) return NULL;
333
334 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
335
336 if (elf->phdr) {
337 #define SHOW_TEXTREL(B) \
338 if (elf->elf_class == ELFCLASS ## B) { \
339 Elf ## B ## _Dyn *dyn; \
340 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
341 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
342 Elf ## B ## _Off offset; \
343 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
344 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
345 offset = EGET(phdr[i].p_offset); \
346 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
347 dyn = DYN ## B (elf->data + offset); \
348 while (EGET(dyn->d_tag) != DT_NULL) { \
349 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
350 *found_textrel = 1; \
351 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
352 return (be_wewy_wewy_quiet ? NULL : ret); \
353 } \
354 ++dyn; \
355 } \
356 } }
357 SHOW_TEXTREL(32)
358 SHOW_TEXTREL(64)
359 }
360
361 if (be_quiet || be_wewy_wewy_quiet)
362 return NULL;
363 else
364 return " - ";
365 }
366 static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
367 {
368 unsigned long s, r, rmax;
369 void *symtab_void, *strtab_void, *text_void;
370
371 if (!show_textrels) return NULL;
372
373 /* don't search for TEXTREL's if the ELF doesn't have any */
374 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
375 if (!*found_textrel) return NULL;
376
377 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
378 text_void = elf_findsecbyname(elf, ".text");
379
380 if (symtab_void && strtab_void && text_void && elf->shdr) {
381 #define SHOW_TEXTRELS(B) \
382 if (elf->elf_class == ELFCLASS ## B) { \
383 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
384 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
385 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
386 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
387 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
388 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
389 uint ## B ## _t memsz = EGET(text->sh_size); \
390 Elf ## B ## _Rel *rel; \
391 Elf ## B ## _Rela *rela; \
392 /* search the section headers for relocations */ \
393 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
394 uint32_t sh_type = EGET(shdr[s].sh_type); \
395 if (sh_type == SHT_REL) { \
396 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \
397 rela = NULL; \
398 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
399 } else if (sh_type == SHT_RELA) { \
400 rel = NULL; \
401 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \
402 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
403 } else \
404 continue; \
405 /* now see if any of the relocs are in the .text */ \
406 for (r = 0; r < rmax; ++r) { \
407 unsigned long sym_max; \
408 Elf ## B ## _Addr offset_tmp; \
409 Elf ## B ## _Sym *func; \
410 Elf ## B ## _Sym *sym; \
411 Elf ## B ## _Addr r_offset; \
412 uint ## B ## _t r_info; \
413 if (sh_type == SHT_REL) { \
414 r_offset = EGET(rel[r].r_offset); \
415 r_info = EGET(rel[r].r_info); \
416 } else { \
417 r_offset = EGET(rela[r].r_offset); \
418 r_info = EGET(rela[r].r_info); \
419 } \
420 /* make sure this relocation is inside of the .text */ \
421 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
422 if (be_verbose <= 2) continue; \
423 } else \
424 *found_textrels = 1; \
425 /* locate this relocation symbol name */ \
426 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
427 if ((void*)sym > (void*)elf->data_end) { \
428 warn("%s: corrupt ELF symbol", elf->filename); \
429 continue; \
430 } \
431 sym_max = ELF ## B ## _R_SYM(r_info); \
432 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
433 sym += sym_max; \
434 else \
435 sym = NULL; \
436 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
437 /* show the raw details about this reloc */ \
438 printf(" %s: ", elf->base_filename); \
439 if (sym && sym->st_name) \
440 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \
441 else \
442 printf("(memory/data?)"); \
443 printf(" [0x%lX]", (unsigned long)r_offset); \
444 /* now try to find the closest symbol that this rel is probably in */ \
445 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
446 func = NULL; \
447 offset_tmp = 0; \
448 while (sym_max--) { \
449 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
450 func = sym; \
451 offset_tmp = EGET(sym->st_value); \
452 } \
453 ++sym; \
454 } \
455 printf(" in "); \
456 if (func && func->st_name) { \
457 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
458 if (r_offset > EGET(func->st_size)) \
459 printf("(optimized out: previous %s)", func_name); \
460 else \
461 printf("%s", func_name); \
462 } else \
463 printf("(optimized out)"); \
464 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
465 if (be_verbose && has_objdump) { \
466 char *sysbuf; \
467 size_t syslen; \
468 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"; \
469 syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
470 sysbuf = xmalloc(syslen); \
471 if (sysbuf) { \
472 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
473 if (end_addr < r_offset) \
474 /* not uncommon when things are optimized out */ \
475 end_addr = r_offset + 0x100; \
476 snprintf(sysbuf, syslen, sysfmt, \
477 (unsigned long)offset_tmp, \
478 (unsigned long)end_addr, \
479 elf->filename, \
480 (unsigned long)r_offset); \
481 fflush(stdout); \
482 system(sysbuf); \
483 fflush(stdout); \
484 free(sysbuf); \
485 } \
486 } \
487 } \
488 } }
489 SHOW_TEXTRELS(32)
490 SHOW_TEXTRELS(64)
491 }
492 if (!*found_textrels)
493 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
494
495 return NULL;
496 }
497
498 static void rpath_security_checks(elfobj *, char *, const char *);
499 static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
500 {
501 struct stat st;
502 switch (*item) {
503 case '/': break;
504 case '.':
505 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
506 break;
507 case ':':
508 case '\0':
509 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
510 break;
511 case '$':
512 if (fstat(elf->fd, &st) != -1)
513 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
514 warnf("Security problem with %s='%s' in %s with mode set of %o",
515 dt_type, item, elf->filename, st.st_mode & 07777);
516 break;
517 default:
518 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
519 break;
520 }
521 }
522 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
523 {
524 unsigned long i, s;
525 char *rpath, *runpath, **r;
526 void *strtbl_void;
527
528 if (!show_rpath) return;
529
530 strtbl_void = elf_findsecbyname(elf, ".dynstr");
531 rpath = runpath = NULL;
532
533 if (elf->phdr && strtbl_void) {
534 #define SHOW_RPATH(B) \
535 if (elf->elf_class == ELFCLASS ## B) { \
536 Elf ## B ## _Dyn *dyn; \
537 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
538 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
539 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
540 Elf ## B ## _Off offset; \
541 Elf ## B ## _Xword word; \
542 /* Scan all the program headers */ \
543 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
544 /* Just scan dynamic headers */ \
545 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
546 offset = EGET(phdr[i].p_offset); \
547 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
548 /* Just scan dynamic RPATH/RUNPATH headers */ \
549 dyn = DYN ## B (elf->data + offset); \
550 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
551 if (word == DT_RPATH) { \
552 r = &rpath; \
553 } else if (word == DT_RUNPATH) { \
554 r = &runpath; \
555 } else { \
556 ++dyn; \
557 continue; \
558 } \
559 /* Verify the memory is somewhat sane */ \
560 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
561 if (offset < (Elf ## B ## _Off)elf->len) { \
562 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
563 *r = (char*)(elf->data + offset); \
564 /* cache the length in case we need to nuke this section later on */ \
565 if (fix_elf) \
566 offset = strlen(*r); \
567 /* If quiet, don't output paths in ld.so.conf */ \
568 if (be_quiet) { \
569 size_t len; \
570 char *start, *end; \
571 /* note that we only 'chop' off leading known paths. */ \
572 /* since *r is read-only memory, we can only move the ptr forward. */ \
573 start = *r; \
574 /* scan each path in : delimited list */ \
575 while (start) { \
576 rpath_security_checks(elf, start, get_elfdtype(word)); \
577 end = strchr(start, ':'); \
578 len = (end ? abs(end - start) : strlen(start)); \
579 if (use_ldcache) \
580 for (s = 0; ldpaths[s]; ++s) \
581 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
582 *r = end; \
583 /* corner case ... if RPATH reads "/usr/lib:", we want \
584 * to show ':' rather than '' */ \
585 if (end && end[1] != '\0') \
586 (*r)++; \
587 break; \
588 } \
589 if (!*r || !end) \
590 break; \
591 else \
592 start = start + len + 1; \
593 } \
594 } \
595 if (*r) { \
596 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
597 /* just nuke it */ \
598 nuke_it##B: \
599 memset(*r, 0x00, offset); \
600 *r = NULL; \
601 ESET(dyn->d_tag, DT_DEBUG); \
602 ESET(dyn->d_un.d_ptr, 0); \
603 } else if (fix_elf) { \
604 /* try to clean "bad" paths */ \
605 size_t len, tmpdir_len; \
606 char *start, *end; \
607 const char *tmpdir; \
608 start = *r; \
609 tmpdir = (getenv("TMPDIR") ? : "."); \
610 tmpdir_len = strlen(tmpdir); \
611 while (1) { \
612 end = strchr(start, ':'); \
613 if (start == end) { \
614 eat_this_path##B: \
615 len = strlen(end); \
616 memmove(start, end+1, len); \
617 start[len-1] = '\0'; \
618 end = start - 1; \
619 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
620 if (!end) { \
621 if (start == *r) \
622 goto nuke_it##B; \
623 *--start = '\0'; \
624 } else \
625 goto eat_this_path##B; \
626 } \
627 if (!end) \
628 break; \
629 start = end + 1; \
630 } \
631 if (**r == '\0') \
632 goto nuke_it##B; \
633 } \
634 if (*r) \
635 *found_rpath = 1; \
636 } \
637 } \
638 ++dyn; \
639 } \
640 } }
641 SHOW_RPATH(32)
642 SHOW_RPATH(64)
643 }
644
645 if (be_wewy_wewy_quiet) return;
646
647 if (rpath && runpath) {
648 if (!strcmp(rpath, runpath)) {
649 xstrcat(ret, runpath, ret_len);
650 } else {
651 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
652 xchrcat(ret, '{', ret_len);
653 xstrcat(ret, rpath, ret_len);
654 xchrcat(ret, ',', ret_len);
655 xstrcat(ret, runpath, ret_len);
656 xchrcat(ret, '}', ret_len);
657 }
658 } else if (rpath || runpath)
659 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
660 else if (!be_quiet)
661 xstrcat(ret, " - ", ret_len);
662 }
663
664 #define LDSO_CACHE_MAGIC "ld.so-"
665 #define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
666 #define LDSO_CACHE_VER "1.7.0"
667 #define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
668 #define FLAG_ANY -1
669 #define FLAG_TYPE_MASK 0x00ff
670 #define FLAG_LIBC4 0x0000
671 #define FLAG_ELF 0x0001
672 #define FLAG_ELF_LIBC5 0x0002
673 #define FLAG_ELF_LIBC6 0x0003
674 #define FLAG_REQUIRED_MASK 0xff00
675 #define FLAG_SPARC_LIB64 0x0100
676 #define FLAG_IA64_LIB64 0x0200
677 #define FLAG_X8664_LIB64 0x0300
678 #define FLAG_S390_LIB64 0x0400
679 #define FLAG_POWERPC_LIB64 0x0500
680 #define FLAG_MIPS64_LIBN32 0x0600
681 #define FLAG_MIPS64_LIBN64 0x0700
682
683 static char *lookup_cache_lib(elfobj *, char *);
684
685 #if defined(__GLIBC__) || defined(__UCLIBC__)
686
687 static char *lookup_cache_lib(elfobj *elf, char *fname)
688 {
689 int fd = 0;
690 char *strs;
691 static char buf[__PAX_UTILS_PATH_MAX] = "";
692 const char *cachefile = "/etc/ld.so.cache";
693 struct stat st;
694
695 typedef struct {
696 char magic[LDSO_CACHE_MAGIC_LEN];
697 char version[LDSO_CACHE_VER_LEN];
698 int nlibs;
699 } header_t;
700 header_t *header;
701
702 typedef struct {
703 int flags;
704 int sooffset;
705 int liboffset;
706 } libentry_t;
707 libentry_t *libent;
708
709 if (fname == NULL)
710 return NULL;
711
712 if (ldcache == 0) {
713 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1)
714 return NULL;
715
716 /* cache these values so we only map/unmap the cache file once */
717 ldcache_size = st.st_size;
718 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
719
720 close(fd);
721
722 if (ldcache == (caddr_t)-1) {
723 ldcache = 0;
724 return NULL;
725 }
726
727 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
728 return NULL;
729 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
730 return NULL;
731 }
732
733 header = (header_t *) ldcache;
734 libent = (libentry_t *) (ldcache + sizeof(header_t));
735 strs = (char *) &libent[header->nlibs];
736
737 for (fd = 0; fd < header->nlibs; fd++) {
738 /* this should be more fine grained, but for now we assume that
739 * diff arches will not be cached together. and we ignore the
740 * the different multilib mips cases. */
741 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
742 continue;
743 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
744 continue;
745
746 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
747 continue;
748 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
749 }
750 return buf;
751 }
752 #elif defined(__NetBSD__)
753 static char *lookup_cache_lib(elfobj *elf, char *fname)
754 {
755 static char buf[__PAX_UTILS_PATH_MAX] = "";
756 static struct stat st;
757
758 char **ldpath;
759 for (ldpath = ldpaths; *ldpath != NULL; ldpath++) {
760 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", *ldpath, fname) >= sizeof(buf))
761 continue; /* if the pathname is too long, or something went wrong, ignore */
762
763 if (stat(buf, &st) != 0)
764 continue; /* if the lib doesn't exist in *ldpath, look further */
765
766 /* NetBSD doesn't actually do sanity checks, it just loads the file
767 * and if that doesn't work, continues looking in other directories.
768 * This cannot easily be safely emulated, unfortunately. For now,
769 * just assume that if it exists, it's a valid library. */
770
771 return buf;
772 }
773
774 /* not found in any path */
775 return NULL;
776 }
777 #else
778 #warning Cache support not implemented for your target
779 static char *lookup_cache_lib(elfobj *elf, char *fname)
780 {
781 return NULL;
782 }
783 #endif
784
785 static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
786 {
787 unsigned long i;
788 char *needed;
789 void *strtbl_void;
790 char *p;
791
792 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
793
794 strtbl_void = elf_findsecbyname(elf, ".dynstr");
795
796 if (elf->phdr && strtbl_void) {
797 #define SHOW_NEEDED(B) \
798 if (elf->elf_class == ELFCLASS ## B) { \
799 Elf ## B ## _Dyn *dyn; \
800 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
801 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
802 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
803 Elf ## B ## _Off offset; \
804 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
805 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
806 offset = EGET(phdr[i].p_offset); \
807 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
808 dyn = DYN ## B (elf->data + offset); \
809 while (EGET(dyn->d_tag) != DT_NULL) { \
810 if (EGET(dyn->d_tag) == DT_NEEDED) { \
811 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
812 if (offset >= (Elf ## B ## _Off)elf->len) { \
813 ++dyn; \
814 continue; \
815 } \
816 needed = (char*)(elf->data + offset); \
817 if (op == 0) { \
818 if (!be_wewy_wewy_quiet) { \
819 if (*found_needed) xchrcat(ret, ',', ret_len); \
820 if (use_ldcache) \
821 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
822 needed = p; \
823 xstrcat(ret, needed, ret_len); \
824 } \
825 *found_needed = 1; \
826 } else { \
827 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \
828 *found_lib = 1; \
829 return (be_wewy_wewy_quiet ? NULL : needed); \
830 } \
831 } \
832 } \
833 ++dyn; \
834 } \
835 } }
836 SHOW_NEEDED(32)
837 SHOW_NEEDED(64)
838 if (op == 0 && !*found_needed && be_verbose)
839 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
840 }
841
842 return NULL;
843 }
844 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
845 {
846 void *strtbl_void;
847
848 if (!show_interp) return NULL;
849
850 strtbl_void = elf_findsecbyname(elf, ".interp");
851
852 if (strtbl_void) {
853 #define SHOW_INTERP(B) \
854 if (elf->elf_class == ELFCLASS ## B) { \
855 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
856 *found_interp = 1; \
857 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
858 }
859 SHOW_INTERP(32)
860 SHOW_INTERP(64)
861 }
862 return NULL;
863 }
864 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
865 {
866 unsigned long i;
867 struct stat s;
868 char dynamic = 0;
869
870 if (!show_bind) return NULL;
871 if (!elf->phdr) return NULL;
872
873 #define SHOW_BIND(B) \
874 if (elf->elf_class == ELFCLASS ## B) { \
875 Elf ## B ## _Dyn *dyn; \
876 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
877 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
878 Elf ## B ## _Off offset; \
879 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
880 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
881 dynamic = 1; \
882 offset = EGET(phdr[i].p_offset); \
883 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
884 dyn = DYN ## B (elf->data + offset); \
885 while (EGET(dyn->d_tag) != DT_NULL) { \
886 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
887 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
888 { \
889 if (be_quiet) return NULL; \
890 *found_bind = 1; \
891 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
892 } \
893 ++dyn; \
894 } \
895 } \
896 }
897 SHOW_BIND(32)
898 SHOW_BIND(64)
899
900 if (be_wewy_wewy_quiet) return NULL;
901
902 /* don't output anything if quiet mode and the ELF is static or not setuid */
903 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
904 return NULL;
905 } else {
906 *found_bind = 1;
907 return (char *) (dynamic ? "LAZY" : "STATIC");
908 }
909 }
910 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
911 {
912 unsigned long i;
913 char *soname;
914 void *strtbl_void;
915
916 if (!show_soname) return NULL;
917
918 strtbl_void = elf_findsecbyname(elf, ".dynstr");
919
920 if (elf->phdr && strtbl_void) {
921 #define SHOW_SONAME(B) \
922 if (elf->elf_class == ELFCLASS ## B) { \
923 Elf ## B ## _Dyn *dyn; \
924 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
925 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
926 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
927 Elf ## B ## _Off offset; \
928 /* only look for soname in shared objects */ \
929 if (ehdr->e_type != ET_DYN) \
930 return NULL; \
931 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
932 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
933 offset = EGET(phdr[i].p_offset); \
934 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
935 dyn = DYN ## B (elf->data + offset); \
936 while (EGET(dyn->d_tag) != DT_NULL) { \
937 if (EGET(dyn->d_tag) == DT_SONAME) { \
938 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
939 if (offset >= (Elf ## B ## _Off)elf->len) { \
940 ++dyn; \
941 continue; \
942 } \
943 soname = (char*)(elf->data + offset); \
944 *found_soname = 1; \
945 return (be_wewy_wewy_quiet ? NULL : soname); \
946 } \
947 ++dyn; \
948 } \
949 } }
950 SHOW_SONAME(32)
951 SHOW_SONAME(64)
952 }
953
954 return NULL;
955 }
956 static char *scanelf_file_sym(elfobj *elf, char *found_sym)
957 {
958 unsigned long i;
959 char *ret;
960 void *symtab_void, *strtab_void;
961
962 if (!find_sym) return NULL;
963 ret = find_sym;
964
965 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
966
967 if (symtab_void && strtab_void) {
968 #define FIND_SYM(B) \
969 if (elf->elf_class == ELFCLASS ## B) { \
970 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
971 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
972 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
973 unsigned long cnt = EGET(symtab->sh_entsize); \
974 char *symname; \
975 if (cnt) \
976 cnt = EGET(symtab->sh_size) / cnt; \
977 for (i = 0; i < cnt; ++i) { \
978 if (sym->st_name) { \
979 /* make sure the symbol name is in acceptable memory range */ \
980 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
981 if ((void*)symname > (void*)elf->data_end) { \
982 warnf("%s: corrupt ELF symbols", elf->filename); \
983 ++sym; \
984 continue; \
985 } \
986 /* debug display ... show all symbols and some extra info */ \
987 if (gmatch ? rematch(ret, symname, REG_EXTENDED) == 0 : *ret == '*') { \
988 printf("%s(%s) %5lX %15s %s\n", \
989 ((*found_sym == 0) ? "\n\t" : "\t"), \
990 elf->base_filename, \
991 (unsigned long)sym->st_size, \
992 get_elfstttype(sym->st_info), \
993 symname); \
994 *found_sym = 1; \
995 } else { \
996 /* allow the user to specify a comma delimited list of symbols to search for */ \
997 char *this_sym, *this_sym_ver, *next_sym; \
998 this_sym = ret; \
999 this_sym_ver = versioned_symname; \
1000 do { \
1001 next_sym = strchr(this_sym, ','); \
1002 if (next_sym == NULL) \
1003 next_sym = this_sym + strlen(this_sym); \
1004 /* do we want a defined symbol ? */ \
1005 if (*this_sym == '+') { \
1006 if (sym->st_shndx == SHN_UNDEF) \
1007 goto skip_this_sym##B; \
1008 ++this_sym; \
1009 ++this_sym_ver; \
1010 /* do we want an undefined symbol ? */ \
1011 } else if (*this_sym == '-') { \
1012 if (sym->st_shndx != SHN_UNDEF) \
1013 goto skip_this_sym##B; \
1014 ++this_sym; \
1015 ++this_sym_ver; \
1016 } \
1017 /* ok, lets compare the name now */ \
1018 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
1019 (strncmp(this_sym_ver, symname, strlen(this_sym_ver)) == 0)) { \
1020 if (be_semi_verbose) { \
1021 char buf[126]; \
1022 snprintf(buf, sizeof(buf), "%lX %s %s", \
1023 (unsigned long)sym->st_size, get_elfstttype(sym->st_info), this_sym); \
1024 ret = buf; \
1025 } else \
1026 ret = this_sym; \
1027 (*found_sym)++; \
1028 goto break_out; \
1029 } \
1030 skip_this_sym##B: this_sym = next_sym + 1; \
1031 } while (*next_sym != '\0'); \
1032 } \
1033 } \
1034 ++sym; \
1035 } }
1036 FIND_SYM(32)
1037 FIND_SYM(64)
1038 }
1039
1040 break_out:
1041 if (be_wewy_wewy_quiet) return NULL;
1042
1043 if (*find_sym != '*' && *found_sym)
1044 return ret;
1045 if (be_quiet)
1046 return NULL;
1047 else
1048 return (char *)" - ";
1049 }
1050
1051
1052 static char *scanelf_file_sections(elfobj *elf, char *found_section)
1053 {
1054 if (!find_section)
1055 return NULL;
1056
1057 #define FIND_SECTION(B) \
1058 if (elf->elf_class == ELFCLASS ## B) { \
1059 int invert; \
1060 Elf ## B ## _Shdr *section; \
1061 invert = (*find_section == '!' ? 1 : 0); \
1062 section = SHDR ## B (elf_findsecbyname(elf, find_section+invert)); \
1063 if ((section == NULL && invert) || (section != NULL && !invert)) \
1064 *found_section = 1; \
1065 }
1066 FIND_SECTION(32)
1067 FIND_SECTION(64)
1068
1069 if (be_wewy_wewy_quiet)
1070 return NULL;
1071
1072 if (*found_section)
1073 return find_section;
1074
1075 if (be_quiet)
1076 return NULL;
1077 else
1078 return (char *)" - ";
1079 }
1080
1081 /* scan an elf file and show all the fun stuff */
1082 #define prints(str) write(fileno(stdout), str, strlen(str))
1083 static int scanelf_elfobj(elfobj *elf)
1084 {
1085 unsigned long i;
1086 char found_pax, found_phdr, found_relro, found_load, found_textrel,
1087 found_rpath, found_needed, found_interp, found_bind, found_soname,
1088 found_sym, found_lib, found_file, found_textrels, found_section;
1089 static char *out_buffer = NULL;
1090 static size_t out_len;
1091
1092 found_pax = found_phdr = found_relro = found_load = found_textrel = \
1093 found_rpath = found_needed = found_interp = found_bind = found_soname = \
1094 found_sym = found_lib = found_file = found_textrels = found_section = 0;
1095
1096 if (be_verbose > 2)
1097 printf("%s: scanning file {%s,%s}\n", elf->filename,
1098 get_elfeitype(EI_CLASS, elf->elf_class),
1099 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
1100 else if (be_verbose > 1)
1101 printf("%s: scanning file\n", elf->filename);
1102
1103 /* init output buffer */
1104 if (!out_buffer) {
1105 out_len = sizeof(char) * 80;
1106 out_buffer = (char*)xmalloc(out_len);
1107 }
1108 *out_buffer = '\0';
1109
1110 /* show the header */
1111 if (!be_quiet && show_banner) {
1112 for (i = 0; out_format[i]; ++i) {
1113 if (!IS_MODIFIER(out_format[i])) continue;
1114
1115 switch (out_format[++i]) {
1116 case '+': break;
1117 case '%': break;
1118 case '#': break;
1119 case 'F':
1120 case 'p':
1121 case 'f': prints("FILE "); found_file = 1; break;
1122 case 'o': prints(" TYPE "); break;
1123 case 'x': prints(" PAX "); break;
1124 case 'e': prints("STK/REL/PTL "); break;
1125 case 't': prints("TEXTREL "); break;
1126 case 'r': prints("RPATH "); break;
1127 case 'M': prints("CLASS "); break;
1128 case 'n': prints("NEEDED "); break;
1129 case 'i': prints("INTERP "); break;
1130 case 'b': prints("BIND "); break;
1131 case 'S': prints("SONAME "); break;
1132 case 's': prints("SYM "); break;
1133 case 'N': prints("LIB "); break;
1134 case 'T': prints("TEXTRELS "); break;
1135 case 'k': prints("SECTION "); break;
1136 case 'a': prints("ARCH "); break;
1137 default: warnf("'%c' has no title ?", out_format[i]);
1138 }
1139 }
1140 if (!found_file) prints("FILE ");
1141 prints("\n");
1142 found_file = 0;
1143 show_banner = 0;
1144 }
1145
1146 /* dump all the good stuff */
1147 for (i = 0; out_format[i]; ++i) {
1148 const char *out;
1149 const char *tmp;
1150
1151 if (!IS_MODIFIER(out_format[i])) {
1152 xchrcat(&out_buffer, out_format[i], &out_len);
1153 continue;
1154 }
1155
1156 out = NULL;
1157 be_wewy_wewy_quiet = (out_format[i] == '#');
1158 be_semi_verbose = (out_format[i] == '+');
1159 switch (out_format[++i]) {
1160 case '+':
1161 case '%':
1162 case '#':
1163 xchrcat(&out_buffer, out_format[i], &out_len); break;
1164 case 'F':
1165 found_file = 1;
1166 if (be_wewy_wewy_quiet) break;
1167 xstrcat(&out_buffer, elf->filename, &out_len);
1168 break;
1169 case 'p':
1170 found_file = 1;
1171 if (be_wewy_wewy_quiet) break;
1172 tmp = elf->filename;
1173 if (search_path) {
1174 ssize_t len_search = strlen(search_path);
1175 ssize_t len_file = strlen(elf->filename);
1176 if (!strncmp(elf->filename, search_path, len_search) && \
1177 len_file > len_search)
1178 tmp += len_search;
1179 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1180 }
1181 xstrcat(&out_buffer, tmp, &out_len);
1182 break;
1183 case 'f':
1184 found_file = 1;
1185 if (be_wewy_wewy_quiet) break;
1186 tmp = strrchr(elf->filename, '/');
1187 tmp = (tmp == NULL ? elf->filename : tmp+1);
1188 xstrcat(&out_buffer, tmp, &out_len);
1189 break;
1190 case 'o': out = get_elfetype(elf); break;
1191 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
1192 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
1193 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1194 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
1195 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1196 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1197 case 'n':
1198 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
1199 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1200 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1201 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
1202 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1203 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1204 case 'a': out = get_elfemtype(elf); break;
1205 default: warnf("'%c' has no scan code?", out_format[i]);
1206 }
1207 if (out) {
1208 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
1209 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
1210 xstrncat(&out_buffer, out, &out_len, (tmp-out));
1211 else
1212 xstrcat(&out_buffer, out, &out_len);
1213 }
1214 }
1215
1216 #define FOUND_SOMETHING() \
1217 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1218 found_rpath || found_needed || found_interp || found_bind || \
1219 found_soname || found_sym || found_lib || found_textrels || found_section )
1220
1221 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1222 xchrcat(&out_buffer, ' ', &out_len);
1223 xstrcat(&out_buffer, elf->filename, &out_len);
1224 }
1225 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
1226 puts(out_buffer);
1227 fflush(stdout);
1228 }
1229
1230 return 0;
1231 }
1232
1233 /* scan a single elf */
1234 static int scanelf_elf(const char *filename, int fd, size_t len)
1235 {
1236 int ret = 1;
1237 elfobj *elf;
1238
1239 /* verify this is real ELF */
1240 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1241 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1242 return ret;
1243 }
1244 switch (match_bits) {
1245 case 32:
1246 if (elf->elf_class != ELFCLASS32)
1247 goto label_done;
1248 break;
1249 case 64:
1250 if (elf->elf_class != ELFCLASS64)
1251 goto label_done;
1252 break;
1253 default: break;
1254 }
1255 if (strlen(match_etypes)) {
1256 char sbuf[126];
1257 strncpy(sbuf, match_etypes, sizeof(sbuf));
1258 if (strchr(match_etypes, ',') != NULL) {
1259 char *p;
1260 while((p = strrchr(sbuf, ',')) != NULL) {
1261 *p = 0;
1262 if (etype_lookup(p+1) == get_etype(elf))
1263 goto label_ret;
1264 }
1265 }
1266 if (etype_lookup(sbuf) != get_etype(elf))
1267 goto label_done;
1268 }
1269
1270 label_ret:
1271 ret = scanelf_elfobj(elf);
1272
1273 label_done:
1274 unreadelf(elf);
1275 return ret;
1276 }
1277
1278 /* scan an archive of elfs */
1279 static int scanelf_archive(const char *filename, int fd, size_t len)
1280 {
1281 archive_handle *ar;
1282 archive_member *m;
1283 char *ar_buffer;
1284 elfobj *elf;
1285
1286 ar = ar_open_fd(filename, fd);
1287 if (ar == NULL)
1288 return 1;
1289
1290 ar_buffer = (char*)mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1291 while ((m=ar_next(ar)) != NULL) {
1292 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size);
1293 if (elf) {
1294 scanelf_elfobj(elf);
1295 unreadelf(elf);
1296 }
1297 }
1298 munmap(ar_buffer, len);
1299
1300 return 0;
1301 }
1302 /* scan a file which may be an elf or an archive or some other magical beast */
1303 static int scanelf_file(const char *filename, const struct stat *st_cache)
1304 {
1305 const struct stat *st = st_cache;
1306 struct stat symlink_st;
1307 int fd;
1308
1309 /* always handle regular files and handle symlinked files if no -y */
1310 if (S_ISLNK(st->st_mode)) {
1311 if (!scan_symlink) return 1;
1312 stat(filename, &symlink_st);
1313 st = &symlink_st;
1314 }
1315
1316 if (!S_ISREG(st->st_mode)) {
1317 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1318 return 1;
1319 }
1320
1321 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1322 return 1;
1323
1324 if (scanelf_elf(filename, fd, st->st_size) == 1 && scan_archives)
1325 /* if it isn't an ELF, maybe it's an .a archive */
1326 scanelf_archive(filename, fd, st->st_size);
1327
1328 close(fd);
1329 return 0;
1330 }
1331
1332 /* scan a directory for ET_EXEC files and print when we find one */
1333 static int scanelf_dir(const char *path)
1334 {
1335 register DIR *dir;
1336 register struct dirent *dentry;
1337 struct stat st_top, st;
1338 char buf[__PAX_UTILS_PATH_MAX];
1339 size_t pathlen = 0, len = 0;
1340 int ret = 0;
1341
1342 /* make sure path exists */
1343 if (lstat(path, &st_top) == -1) {
1344 if (be_verbose > 2) printf("%s: does not exist\n", path);
1345 return 1;
1346 }
1347
1348 /* ok, if it isn't a directory, assume we can open it */
1349 if (!S_ISDIR(st_top.st_mode)) {
1350 return scanelf_file(path, &st_top);
1351 }
1352
1353 /* now scan the dir looking for fun stuff */
1354 if ((dir = opendir(path)) == NULL) {
1355 warnf("could not opendir %s: %s", path, strerror(errno));
1356 return 1;
1357 }
1358 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1359
1360 pathlen = strlen(path);
1361 while ((dentry = readdir(dir))) {
1362 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1363 continue;
1364 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
1365 if (len >= sizeof(buf)) {
1366 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1367 (unsigned long)len, (unsigned long)sizeof(buf));
1368 continue;
1369 }
1370 snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name);
1371 if (lstat(buf, &st) != -1) {
1372 if (S_ISREG(st.st_mode))
1373 ret = scanelf_file(buf, &st);
1374 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1375 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1376 ret = scanelf_dir(buf);
1377 }
1378 }
1379 }
1380 closedir(dir);
1381 return ret;
1382 }
1383
1384 static int scanelf_from_file(const char *filename)
1385 {
1386 FILE *fp = NULL;
1387 char *p;
1388 char path[__PAX_UTILS_PATH_MAX];
1389 int ret = 0;
1390
1391 if (strcmp(filename, "-") == 0)
1392 fp = stdin;
1393 else if ((fp = fopen(filename, "r")) == NULL)
1394 return 1;
1395
1396 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1397 if ((p = strchr(path, '\n')) != NULL)
1398 *p = 0;
1399 search_path = path;
1400 ret = scanelf_dir(path);
1401 }
1402 if (fp != stdin)
1403 fclose(fp);
1404 return ret;
1405 }
1406
1407 #if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1408
1409 static int load_ld_cache_config(int i, const char *fname)
1410 {
1411 FILE *fp = NULL;
1412 char *p;
1413 char path[__PAX_UTILS_PATH_MAX];
1414
1415 if (i + 1 == ARRAY_SIZE(ldpaths))
1416 return i;
1417
1418 if ((fp = fopen(fname, "r")) == NULL)
1419 return i;
1420
1421 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1422 if ((p = strrchr(path, '\r')) != NULL)
1423 *p = 0;
1424 if ((p = strchr(path, '\n')) != NULL)
1425 *p = 0;
1426 #ifdef __linux__
1427 // recursive includes of the same file will make this segfault.
1428 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1429 glob64_t gl;
1430 size_t x;
1431 char gpath[__PAX_UTILS_PATH_MAX];
1432
1433 memset(gpath, 0, sizeof(gpath));
1434
1435 if (path[8] != '/')
1436 snprintf(gpath, sizeof(gpath), "/etc/%s", &path[8]);
1437 else
1438 strncpy(gpath, &path[8], sizeof(gpath));
1439
1440 if ((glob64(gpath, 0, NULL, &gl)) == 0) {
1441 for (x = 0; x < gl.gl_pathc; ++x) {
1442 /* try to avoid direct loops */
1443 if (strcmp(gl.gl_pathv[x], fname) == 0)
1444 continue;
1445 i = load_ld_cache_config(i, gl.gl_pathv[x]);
1446 if (i + 1 >= ARRAY_SIZE(ldpaths)) {
1447 globfree64(&gl);
1448 return i;
1449 }
1450 }
1451 globfree64 (&gl);
1452 continue;
1453 }
1454 }
1455 #endif
1456 if (*path != '/')
1457 continue;
1458
1459 ldpaths[i++] = xstrdup(path);
1460
1461 if (i + 1 == ARRAY_SIZE(ldpaths))
1462 break;
1463 }
1464 ldpaths[i] = NULL;
1465
1466 fclose(fp);
1467 return i;
1468 }
1469
1470 #elif defined(__FreeBSD__) || (__DragonFly__)
1471
1472 static int load_ld_cache_config(int i, const char *fname)
1473 {
1474 FILE *fp = NULL;
1475 char *b = NULL, *p;
1476 struct elfhints_hdr hdr;
1477
1478 if (i + 1 == ARRAY_SIZE(ldpaths))
1479 return i;
1480
1481 if ((fp = fopen(fname, "r")) == NULL)
1482 return i;
1483
1484 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1485 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1486 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1487 {
1488 fclose(fp);
1489 return i;
1490 }
1491
1492 b = (char*)malloc(hdr.dirlistlen+1);
1493 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1494 fclose(fp);
1495 free(b);
1496 return i;
1497 }
1498
1499 while ((p = strsep(&b, ":"))) {
1500 if (*p == '\0') continue;
1501 ldpaths[i++] = xstrdup(p);
1502
1503 if (i + 1 == ARRAY_SIZE(ldpaths))
1504 break;
1505 }
1506 ldpaths[i] = NULL;
1507
1508 free(b);
1509 fclose(fp);
1510 return i;
1511 }
1512
1513 #else
1514
1515 #warning Cache config support not implemented for your target
1516 static int load_ld_cache_config(int i, const char *fname)
1517 {
1518 memset(ldpaths, 0x00, sizeof(ldpaths));
1519 }
1520
1521 #endif
1522
1523 /* scan /etc/ld.so.conf for paths */
1524 static void scanelf_ldpath()
1525 {
1526 char scan_l, scan_ul, scan_ull;
1527 int i = 0;
1528
1529 if (!ldpaths[0])
1530 err("Unable to load any paths from ld.so.conf");
1531
1532 scan_l = scan_ul = scan_ull = 0;
1533
1534 while (ldpaths[i]) {
1535 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
1536 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
1537 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
1538 scanelf_dir(ldpaths[i]);
1539 ++i;
1540 }
1541
1542 if (!scan_l) scanelf_dir("/lib");
1543 if (!scan_ul) scanelf_dir("/usr/lib");
1544 if (!scan_ull) scanelf_dir("/usr/local/lib");
1545 }
1546
1547 /* scan env PATH for paths */
1548 static void scanelf_envpath()
1549 {
1550 char *path, *p;
1551
1552 path = getenv("PATH");
1553 if (!path)
1554 err("PATH is not set in your env !");
1555 path = xstrdup(path);
1556
1557 while ((p = strrchr(path, ':')) != NULL) {
1558 scanelf_dir(p + 1);
1559 *p = 0;
1560 }
1561
1562 free(path);
1563 }
1564
1565 /* usage / invocation handling functions */
1566 #define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:BhV"
1567 #define a_argument required_argument
1568 static struct option const long_opts[] = {
1569 {"path", no_argument, NULL, 'p'},
1570 {"ldpath", no_argument, NULL, 'l'},
1571 {"recursive", no_argument, NULL, 'R'},
1572 {"mount", no_argument, NULL, 'm'},
1573 {"symlink", no_argument, NULL, 'y'},
1574 {"archives", no_argument, NULL, 'A'},
1575 {"ldcache", no_argument, NULL, 'L'},
1576 {"fix", no_argument, NULL, 'X'},
1577 {"setpax", a_argument, NULL, 'z'},
1578 {"pax", no_argument, NULL, 'x'},
1579 {"header", no_argument, NULL, 'e'},
1580 {"textrel", no_argument, NULL, 't'},
1581 {"rpath", no_argument, NULL, 'r'},
1582 {"needed", no_argument, NULL, 'n'},
1583 {"interp", no_argument, NULL, 'i'},
1584 {"bind", no_argument, NULL, 'b'},
1585 {"soname", no_argument, NULL, 'S'},
1586 {"symbol", a_argument, NULL, 's'},
1587 {"section", a_argument, NULL, 'k'},
1588 {"lib", a_argument, NULL, 'N'},
1589 {"gmatch", no_argument, NULL, 'g'},
1590 {"textrels", no_argument, NULL, 'T'},
1591 {"etype", a_argument, NULL, 'E'},
1592 {"bits", a_argument, NULL, 'M'},
1593 {"all", no_argument, NULL, 'a'},
1594 {"quiet", no_argument, NULL, 'q'},
1595 {"verbose", no_argument, NULL, 'v'},
1596 {"format", a_argument, NULL, 'F'},
1597 {"from", a_argument, NULL, 'f'},
1598 {"file", a_argument, NULL, 'o'},
1599 {"nobanner", no_argument, NULL, 'B'},
1600 {"help", no_argument, NULL, 'h'},
1601 {"version", no_argument, NULL, 'V'},
1602 {NULL, no_argument, NULL, 0x0}
1603 };
1604
1605 static const char *opts_help[] = {
1606 "Scan all directories in PATH environment",
1607 "Scan all directories in /etc/ld.so.conf",
1608 "Scan directories recursively",
1609 "Don't recursively cross mount points",
1610 "Don't scan symlinks",
1611 "Scan archives (.a files)",
1612 "Utilize ld.so.cache information (use with -r/-n)",
1613 "Try and 'fix' bad things (use with -r/-e)",
1614 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1615 "Print PaX markings",
1616 "Print GNU_STACK/PT_LOAD markings",
1617 "Print TEXTREL information",
1618 "Print RPATH information",
1619 "Print NEEDED information",
1620 "Print INTERP information",
1621 "Print BIND information",
1622 "Print SONAME information",
1623 "Find a specified symbol",
1624 "Find a specified section",
1625 "Find a specified library",
1626 "Use strncmp to match libraries. (use with -N)",
1627 "Locate cause of TEXTREL",
1628 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1629 "Print only ELF files matching numeric bits",
1630 "Print all scanned info (-x -e -t -r -b)\n",
1631 "Only output 'bad' things",
1632 "Be verbose (can be specified more than once)",
1633 "Use specified format for output",
1634 "Read input stream from a filename",
1635 "Write output stream to a filename",
1636 "Don't display the header",
1637 "Print this help and exit",
1638 "Print version and exit",
1639 NULL
1640 };
1641
1642 /* display usage and exit */
1643 static void usage(int status)
1644 {
1645 unsigned long i;
1646 printf("* Scan ELF binaries for stuff\n\n"
1647 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1648 printf("Options: -[%s]\n", PARSE_FLAGS);
1649 for (i = 0; long_opts[i].name; ++i)
1650 if (long_opts[i].has_arg == no_argument)
1651 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
1652 long_opts[i].name, opts_help[i]);
1653 else
1654 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
1655 long_opts[i].name, opts_help[i]);
1656
1657 puts("\nFor more information, see the scanelf(1) manpage");
1658 exit(status);
1659 }
1660
1661 /* parse command line arguments and preform needed actions */
1662 #define do_pax_state(option, flag) \
1663 if (islower(option)) { \
1664 flags &= ~PF_##flag; \
1665 flags |= PF_NO##flag; \
1666 } else { \
1667 flags &= ~PF_NO##flag; \
1668 flags |= PF_##flag; \
1669 }
1670 static int parseargs(int argc, char *argv[])
1671 {
1672 int i;
1673 const char *from_file = NULL;
1674 int ret = 0;
1675
1676 opterr = 0;
1677 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1678 switch (i) {
1679
1680 case 'V':
1681 printf("pax-utils-%s: %s compiled %s\n%s\n"
1682 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
1683 VERSION, __FILE__, __DATE__, rcsid, argv0);
1684 exit(EXIT_SUCCESS);
1685 break;
1686 case 'h': usage(EXIT_SUCCESS); break;
1687 case 'f':
1688 if (from_file) warn("You prob don't want to specify -f twice");
1689 from_file = optarg;
1690 break;
1691 case 'E':
1692 strncpy(match_etypes, optarg, sizeof(match_etypes));
1693 break;
1694 case 'M':
1695 match_bits = atoi(optarg);
1696 break;
1697 case 'o': {
1698 if (freopen(optarg, "w", stdout) == NULL)
1699 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1700 break;
1701 }
1702 case 'k':
1703 if (find_section) warn("You prob don't want to specify -k twice");
1704 find_section = optarg;
1705 break;
1706 case 's': {
1707 if (find_sym) warn("You prob don't want to specify -s twice");
1708 find_sym = optarg;
1709 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1710 sprintf(versioned_symname, "%s@", find_sym);
1711 break;
1712 }
1713 case 'N': {
1714 if (find_lib) warn("You prob don't want to specify -N twice");
1715 find_lib = optarg;
1716 break;
1717 }
1718
1719 case 'F': {
1720 if (out_format) warn("You prob don't want to specify -F twice");
1721 out_format = optarg;
1722 break;
1723 }
1724 case 'z': {
1725 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1726 size_t x;
1727
1728 for (x = 0 ; x < strlen(optarg); x++) {
1729 switch(optarg[x]) {
1730 case 'p':
1731 case 'P':
1732 do_pax_state(optarg[x], PAGEEXEC);
1733 break;
1734 case 's':
1735 case 'S':
1736 do_pax_state(optarg[x], SEGMEXEC);
1737 break;
1738 case 'm':
1739 case 'M':
1740 do_pax_state(optarg[x], MPROTECT);
1741 break;
1742 case 'e':
1743 case 'E':
1744 do_pax_state(optarg[x], EMUTRAMP);
1745 break;
1746 case 'r':
1747 case 'R':
1748 do_pax_state(optarg[x], RANDMMAP);
1749 break;
1750 case 'x':
1751 case 'X':
1752 do_pax_state(optarg[x], RANDEXEC);
1753 break;
1754 default:
1755 break;
1756 }
1757 }
1758 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
1759 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
1760 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
1761 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
1762 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1763 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1764 setpax = flags;
1765 break;
1766 }
1767 case 'g': gmatch = 1; break;
1768 case 'L': use_ldcache = 1; break;
1769 case 'y': scan_symlink = 0; break;
1770 case 'A': scan_archives = 1; break;
1771 case 'B': show_banner = 0; break;
1772 case 'l': scan_ldpath = 1; break;
1773 case 'p': scan_envpath = 1; break;
1774 case 'R': dir_recurse = 1; break;
1775 case 'm': dir_crossmount = 0; break;
1776 case 'X': ++fix_elf; break;
1777 case 'x': show_pax = 1; break;
1778 case 'e': show_phdr = 1; break;
1779 case 't': show_textrel = 1; break;
1780 case 'r': show_rpath = 1; break;
1781 case 'n': show_needed = 1; break;
1782 case 'i': show_interp = 1; break;
1783 case 'b': show_bind = 1; break;
1784 case 'S': show_soname = 1; break;
1785 case 'T': show_textrels = 1; break;
1786 case 'q': be_quiet = 1; break;
1787 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1788 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
1789
1790 case ':':
1791 err("Option '%c' is missing parameter", optopt);
1792 case '?':
1793 err("Unknown option '%c' or argument missing", optopt);
1794 default:
1795 err("Unhandled option '%c'; please report this", i);
1796 }
1797 }
1798 if (show_textrels && be_verbose) {
1799 if (which("objdump") != NULL)
1800 has_objdump = 1;
1801 }
1802 /* let the format option override all other options */
1803 if (out_format) {
1804 show_pax = show_phdr = show_textrel = show_rpath = \
1805 show_needed = show_interp = show_bind = show_soname = \
1806 show_textrels = 0;
1807 for (i = 0; out_format[i]; ++i) {
1808 if (!IS_MODIFIER(out_format[i])) continue;
1809
1810 switch (out_format[++i]) {
1811 case '+': break;
1812 case '%': break;
1813 case '#': break;
1814 case 'F': break;
1815 case 'p': break;
1816 case 'f': break;
1817 case 'k': break;
1818 case 's': break;
1819 case 'N': break;
1820 case 'o': break;
1821 case 'a': break;
1822 case 'M': break;
1823 case 'x': show_pax = 1; break;
1824 case 'e': show_phdr = 1; break;
1825 case 't': show_textrel = 1; break;
1826 case 'r': show_rpath = 1; break;
1827 case 'n': show_needed = 1; break;
1828 case 'i': show_interp = 1; break;
1829 case 'b': show_bind = 1; break;
1830 case 'S': show_soname = 1; break;
1831 case 'T': show_textrels = 1; break;
1832 default:
1833 err("Invalid format specifier '%c' (byte %i)",
1834 out_format[i], i+1);
1835 }
1836 }
1837
1838 /* construct our default format */
1839 } else {
1840 size_t fmt_len = 30;
1841 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
1842 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1843 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1844 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1845 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1846 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1847 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1848 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1849 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1850 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1851 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1852 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1853 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1854 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1855 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1856 }
1857 if (be_verbose > 2) printf("Format: %s\n", out_format);
1858
1859 /* now lets actually do the scanning */
1860 if (scan_ldpath || use_ldcache)
1861 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
1862 if (scan_ldpath) scanelf_ldpath();
1863 if (scan_envpath) scanelf_envpath();
1864 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
1865 from_file = "-";
1866 if (from_file) {
1867 scanelf_from_file(from_file);
1868 from_file = *argv;
1869 }
1870 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1871 err("Nothing to scan !?");
1872 while (optind < argc) {
1873 search_path = argv[optind++];
1874 ret = scanelf_dir(search_path);
1875 }
1876
1877 /* clean up */
1878 free(versioned_symname);
1879 for (i = 0; ldpaths[i]; ++i)
1880 free(ldpaths[i]);
1881
1882 if (ldcache != 0)
1883 munmap(ldcache, ldcache_size);
1884 return ret;
1885 }
1886
1887 static char **get_split_env(const char *envvar)
1888 {
1889 const char *delims = " \t\n";
1890 char **envvals = NULL;
1891 char *env, *s;
1892 int nentry;
1893
1894 if ((env = getenv(envvar)) == NULL)
1895 return NULL;
1896
1897 env = xstrdup(env);
1898 if (env == NULL)
1899 return NULL;
1900
1901 s = strtok(env, delims);
1902 if (s == NULL) {
1903 free(env);
1904 return NULL;
1905 }
1906
1907 nentry = 0;
1908 while (s != NULL) {
1909 ++nentry;
1910 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
1911 envvals[nentry-1] = s;
1912 s = strtok(NULL, delims);
1913 }
1914 envvals[nentry] = NULL;
1915
1916 /* don't want to free(env) as it contains the memory that backs
1917 * the envvals array of strings */
1918 return envvals;
1919 }
1920 static void parseenv()
1921 {
1922 qa_textrels = get_split_env("QA_TEXTRELS");
1923 qa_execstack = get_split_env("QA_EXECSTACK");
1924 qa_wx_load = get_split_env("QA_WX_LOAD");
1925 }
1926
1927 #ifdef __PAX_UTILS_CLEANUP
1928 static void cleanup()
1929 {
1930 free(out_format);
1931 free(qa_textrels);
1932 free(qa_execstack);
1933 free(qa_wx_load);
1934 }
1935 #endif
1936
1937
1938 int main(int argc, char *argv[])
1939 {
1940 int ret;
1941 if (argc < 2)
1942 usage(EXIT_FAILURE);
1943 parseenv();
1944 ret = parseargs(argc, argv);
1945 fclose(stdout);
1946 #ifdef __PAX_UTILS_CLEANUP
1947 cleanup();
1948 warn("The calls to add/delete heap should be off:\n"
1949 "\t- 1 due to the out_buffer not being freed in scanelf_file()\n"
1950 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
1951 #endif
1952 return ret;
1953 }
1954
1955
1956
1957 /* utility funcs */
1958 static char *xstrdup(const char *s)
1959 {
1960 char *ret = strdup(s);
1961 if (!ret) err("Could not strdup(): %s", strerror(errno));
1962 return ret;
1963 }
1964 static void *xmalloc(size_t size)
1965 {
1966 void *ret = malloc(size);
1967 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1968 return ret;
1969 }
1970 static void *xrealloc(void *ptr, size_t size)
1971 {
1972 void *ret = realloc(ptr, size);
1973 if (!ret) err("Could not realloc() %li bytes", (unsigned long)size);
1974 return ret;
1975 }
1976 static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
1977 {
1978 size_t new_len;
1979
1980 new_len = strlen(*dst) + strlen(src);
1981 if (*curr_len <= new_len) {
1982 *curr_len = new_len + (*curr_len / 2);
1983 *dst = realloc(*dst, *curr_len);
1984 if (!*dst)
1985 err("could not realloc() %li bytes", (unsigned long)*curr_len);
1986 }
1987
1988 if (n)
1989 strncat(*dst, src, n);
1990 else
1991 strcat(*dst, src);
1992 }
1993 static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1994 {
1995 static char my_app[2];
1996 my_app[0] = append;
1997 my_app[1] = '\0';
1998 xstrcat(dst, my_app, curr_len);
1999 }
2000
2001 /* Match filename against entries in matchlist, return TRUE
2002 * if the file is listed */
2003 static int file_matches_list(const char *filename, char **matchlist)
2004 {
2005 char **file;
2006 char *match;
2007 char buf[__PAX_UTILS_PATH_MAX];
2008
2009 if (matchlist == NULL)
2010 return 0;
2011
2012 for (file = matchlist; *file != NULL; file++) {
2013 if (search_path) {
2014 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2015 match = buf;
2016 } else {
2017 match = *file;
2018 }
2019 if (fnmatch(match, filename, 0) == 0)
2020 return 1;
2021 }
2022 return 0;
2023 }

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