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Revision 1.177 - (show annotations) (download) (as text)
Sun May 20 23:20:46 2007 UTC (6 years, 11 months ago) by solar
Branch: MAIN
Changes since 1.176: +5 -4 lines
File MIME type: text/x-csrc
- display U for undefined symbols and D for defined symbols when using scanelf -s\* file

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 1.176 2007/04/08 19:14:31 solar 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 1.176 2007/04/08 19:14:31 solar 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 g_match = 0;
68 static char use_ldcache = 0;
69
70 static char **qa_textrels = NULL;
71 static char **qa_execstack = NULL;
72 static char **qa_wx_load = NULL;
73
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
81 /* find the path to a file by name */
82 static char *which(const char *fname)
83 {
84 static char fullpath[BUFSIZ];
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 (char *) 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
114 if ((ret = regcomp(&preg, regex, cflags))) {
115 char err[256];
116
117 if (regerror(ret, &preg, err, sizeof(err)))
118 fprintf(stderr, "regcomp failed: %s", err);
119 else
120 fprintf(stderr, "regcomp failed");
121
122 return EXIT_FAILURE;
123 }
124 ret = regexec(&preg, match, 0, NULL, 0);
125 regfree(&preg);
126
127 return ret;
128 }
129
130 /* sub-funcs for scanelf_file() */
131 static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
132 {
133 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
134 #define GET_SYMTABS(B) \
135 if (elf->elf_class == ELFCLASS ## B) { \
136 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
137 /* debug sections */ \
138 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
139 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
140 /* runtime sections */ \
141 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
142 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
143 if (symtab && dynsym) { \
144 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \
145 } else { \
146 *sym = (void*)(symtab ? symtab : dynsym); \
147 } \
148 if (strtab && dynstr) { \
149 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \
150 } else { \
151 *tab = (void*)(strtab ? strtab : dynstr); \
152 } \
153 }
154 GET_SYMTABS(32)
155 GET_SYMTABS(64)
156 }
157
158 static char *scanelf_file_pax(elfobj *elf, char *found_pax)
159 {
160 static char ret[7];
161 unsigned long i, shown;
162
163 if (!show_pax) return NULL;
164
165 shown = 0;
166 memset(&ret, 0, sizeof(ret));
167
168 if (elf->phdr) {
169 #define SHOW_PAX(B) \
170 if (elf->elf_class == ELFCLASS ## B) { \
171 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
172 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
173 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
174 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
175 continue; \
176 if (fix_elf && setpax) { \
177 /* set the paxctl flags */ \
178 ESET(phdr[i].p_flags, setpax); \
179 } \
180 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
181 continue; \
182 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
183 *found_pax = 1; \
184 ++shown; \
185 break; \
186 } \
187 }
188 SHOW_PAX(32)
189 SHOW_PAX(64)
190 }
191
192
193 if (fix_elf && setpax) {
194 /* set the chpax settings */
195 if (elf->elf_class == ELFCLASS32) {
196 if (EHDR32(elf->ehdr)->e_type == ET_DYN || EHDR32(elf->ehdr)->e_type == ET_EXEC)
197 ESET(EHDR32(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
198 } else {
199 if (EHDR64(elf->ehdr)->e_type == ET_DYN || EHDR64(elf->ehdr)->e_type == ET_EXEC)
200 ESET(EHDR64(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
201 }
202 }
203
204 /* fall back to EI_PAX if no PT_PAX was found */
205 if (!*ret) {
206 static char *paxflags;
207 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
208 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
209 *found_pax = 1;
210 return (be_wewy_wewy_quiet ? NULL : paxflags);
211 }
212 strncpy(ret, paxflags, sizeof(ret));
213 }
214
215 if (be_wewy_wewy_quiet || (be_quiet && !shown))
216 return NULL;
217 else
218 return ret;
219 }
220
221 static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
222 {
223 static char ret[12];
224 char *found;
225 unsigned long i, shown, multi_stack, multi_relro, multi_load;
226 int max_pt_load;
227
228 if (!show_phdr) return NULL;
229
230 memcpy(ret, "--- --- ---\0", 12);
231
232 shown = 0;
233 multi_stack = multi_relro = multi_load = 0;
234 max_pt_load = elf_max_pt_load(elf);
235
236 #define NOTE_GNU_STACK ".note.GNU-stack"
237 #define SHOW_PHDR(B) \
238 if (elf->elf_class == ELFCLASS ## B) { \
239 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
240 Elf ## B ## _Off offset; \
241 uint32_t flags, check_flags; \
242 if (elf->phdr != NULL) { \
243 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
244 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
245 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
246 if (multi_stack++) \
247 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
248 if (file_matches_list(elf->filename, qa_execstack)) \
249 continue; \
250 found = found_phdr; \
251 offset = 0; \
252 check_flags = PF_X; \
253 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
254 if (multi_relro++) \
255 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
256 found = found_relro; \
257 offset = 4; \
258 check_flags = PF_X; \
259 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
260 if (ehdr->e_type == ET_DYN || ehdr->e_type == ET_EXEC) \
261 if (multi_load++ > max_pt_load) \
262 warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
263 if (file_matches_list(elf->filename, qa_wx_load)) \
264 continue; \
265 found = found_load; \
266 offset = 8; \
267 check_flags = PF_W|PF_X; \
268 } else \
269 continue; \
270 flags = EGET(phdr[i].p_flags); \
271 if (be_quiet && ((flags & check_flags) != check_flags)) \
272 continue; \
273 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
274 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
275 ret[3] = ret[7] = '!'; \
276 flags = EGET(phdr[i].p_flags); \
277 } \
278 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
279 *found = 1; \
280 ++shown; \
281 } \
282 } else if (elf->shdr != NULL) { \
283 /* no program headers which means this is prob an object file */ \
284 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
285 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
286 char *str; \
287 if ((void*)strtbl > (void*)elf->data_end) \
288 goto skip_this_shdr##B; \
289 check_flags = SHF_WRITE|SHF_EXECINSTR; \
290 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
291 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
292 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
293 str = elf->data + offset; \
294 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
295 if (!strcmp(str, NOTE_GNU_STACK)) { \
296 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
297 flags = EGET(shdr[i].sh_flags); \
298 if (be_quiet && ((flags & check_flags) != check_flags)) \
299 continue; \
300 ++*found_phdr; \
301 shown = 1; \
302 if (flags & SHF_WRITE) ret[0] = 'W'; \
303 if (flags & SHF_ALLOC) ret[1] = 'A'; \
304 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
305 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
306 break; \
307 } \
308 } \
309 skip_this_shdr##B: \
310 if (!multi_stack) { \
311 if (file_matches_list(elf->filename, qa_execstack)) \
312 return NULL; \
313 *found_phdr = 1; \
314 shown = 1; \
315 memcpy(ret, "!WX", 3); \
316 } \
317 } \
318 }
319 SHOW_PHDR(32)
320 SHOW_PHDR(64)
321
322 if (be_wewy_wewy_quiet || (be_quiet && !shown))
323 return NULL;
324 else
325 return ret;
326 }
327
328 static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
329 {
330 static const char *ret = "TEXTREL";
331 unsigned long i;
332
333 if (!show_textrel && !show_textrels) return NULL;
334
335 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
336
337 if (elf->phdr) {
338 #define SHOW_TEXTREL(B) \
339 if (elf->elf_class == ELFCLASS ## B) { \
340 Elf ## B ## _Dyn *dyn; \
341 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
342 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
343 Elf ## B ## _Off offset; \
344 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
345 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
346 offset = EGET(phdr[i].p_offset); \
347 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
348 dyn = DYN ## B (elf->data + offset); \
349 while (EGET(dyn->d_tag) != DT_NULL) { \
350 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
351 *found_textrel = 1; \
352 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
353 return (be_wewy_wewy_quiet ? NULL : ret); \
354 } \
355 ++dyn; \
356 } \
357 } }
358 SHOW_TEXTREL(32)
359 SHOW_TEXTREL(64)
360 }
361
362 if (be_quiet || be_wewy_wewy_quiet)
363 return NULL;
364 else
365 return " - ";
366 }
367 static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
368 {
369 unsigned long s, r, rmax;
370 void *symtab_void, *strtab_void, *text_void;
371
372 if (!show_textrels) return NULL;
373
374 /* don't search for TEXTREL's if the ELF doesn't have any */
375 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
376 if (!*found_textrel) return NULL;
377
378 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
379 text_void = elf_findsecbyname(elf, ".text");
380
381 if (symtab_void && strtab_void && text_void && elf->shdr) {
382 #define SHOW_TEXTRELS(B) \
383 if (elf->elf_class == ELFCLASS ## B) { \
384 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
385 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
386 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
387 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
388 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
389 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
390 uint ## B ## _t memsz = EGET(text->sh_size); \
391 Elf ## B ## _Rel *rel; \
392 Elf ## B ## _Rela *rela; \
393 /* search the section headers for relocations */ \
394 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
395 uint32_t sh_type = EGET(shdr[s].sh_type); \
396 if (sh_type == SHT_REL) { \
397 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \
398 rela = NULL; \
399 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
400 } else if (sh_type == SHT_RELA) { \
401 rel = NULL; \
402 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \
403 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
404 } else \
405 continue; \
406 /* now see if any of the relocs are in the .text */ \
407 for (r = 0; r < rmax; ++r) { \
408 unsigned long sym_max; \
409 Elf ## B ## _Addr offset_tmp; \
410 Elf ## B ## _Sym *func; \
411 Elf ## B ## _Sym *sym; \
412 Elf ## B ## _Addr r_offset; \
413 uint ## B ## _t r_info; \
414 if (sh_type == SHT_REL) { \
415 r_offset = EGET(rel[r].r_offset); \
416 r_info = EGET(rel[r].r_info); \
417 } else { \
418 r_offset = EGET(rela[r].r_offset); \
419 r_info = EGET(rela[r].r_info); \
420 } \
421 /* make sure this relocation is inside of the .text */ \
422 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
423 if (be_verbose <= 2) continue; \
424 } else \
425 *found_textrels = 1; \
426 /* locate this relocation symbol name */ \
427 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
428 if ((void*)sym > (void*)elf->data_end) { \
429 warn("%s: corrupt ELF symbol", elf->filename); \
430 continue; \
431 } \
432 sym_max = ELF ## B ## _R_SYM(r_info); \
433 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
434 sym += sym_max; \
435 else \
436 sym = NULL; \
437 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
438 /* show the raw details about this reloc */ \
439 printf(" %s: ", elf->base_filename); \
440 if (sym && sym->st_name) \
441 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \
442 else \
443 printf("(memory/data?)"); \
444 printf(" [0x%lX]", (unsigned long)r_offset); \
445 /* now try to find the closest symbol that this rel is probably in */ \
446 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
447 func = NULL; \
448 offset_tmp = 0; \
449 while (sym_max--) { \
450 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
451 func = sym; \
452 offset_tmp = EGET(sym->st_value); \
453 } \
454 ++sym; \
455 } \
456 printf(" in "); \
457 if (func && func->st_name) { \
458 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
459 if (r_offset > EGET(func->st_size)) \
460 printf("(optimized out: previous %s)", func_name); \
461 else \
462 printf("%s", func_name); \
463 } else \
464 printf("(optimized out)"); \
465 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
466 if (be_verbose && has_objdump) { \
467 char *sysbuf; \
468 size_t syslen; \
469 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"; \
470 syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
471 sysbuf = xmalloc(syslen); \
472 if (sysbuf) { \
473 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
474 if (end_addr < r_offset) \
475 /* not uncommon when things are optimized out */ \
476 end_addr = r_offset + 0x100; \
477 snprintf(sysbuf, syslen, sysfmt, \
478 (unsigned long)offset_tmp, \
479 (unsigned long)end_addr, \
480 elf->filename, \
481 (unsigned long)r_offset); \
482 fflush(stdout); \
483 system(sysbuf); \
484 fflush(stdout); \
485 free(sysbuf); \
486 } \
487 } \
488 } \
489 } }
490 SHOW_TEXTRELS(32)
491 SHOW_TEXTRELS(64)
492 }
493 if (!*found_textrels)
494 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
495
496 return NULL;
497 }
498
499 static void rpath_security_checks(elfobj *, char *, const char *);
500 static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
501 {
502 struct stat st;
503 switch (*item) {
504 case '/': break;
505 case '.':
506 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
507 break;
508 case ':':
509 case '\0':
510 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
511 break;
512 case '$':
513 if (fstat(elf->fd, &st) != -1)
514 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
515 warnf("Security problem with %s='%s' in %s with mode set of %o",
516 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
517 break;
518 default:
519 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
520 break;
521 }
522 }
523 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
524 {
525 unsigned long i, s;
526 char *rpath, *runpath, **r;
527 void *strtbl_void;
528
529 if (!show_rpath) return;
530
531 strtbl_void = elf_findsecbyname(elf, ".dynstr");
532 rpath = runpath = NULL;
533
534 if (elf->phdr && strtbl_void) {
535 #define SHOW_RPATH(B) \
536 if (elf->elf_class == ELFCLASS ## B) { \
537 Elf ## B ## _Dyn *dyn; \
538 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
539 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
540 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
541 Elf ## B ## _Off offset; \
542 Elf ## B ## _Xword word; \
543 /* Scan all the program headers */ \
544 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
545 /* Just scan dynamic headers */ \
546 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
547 offset = EGET(phdr[i].p_offset); \
548 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
549 /* Just scan dynamic RPATH/RUNPATH headers */ \
550 dyn = DYN ## B (elf->data + offset); \
551 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
552 if (word == DT_RPATH) { \
553 r = &rpath; \
554 } else if (word == DT_RUNPATH) { \
555 r = &runpath; \
556 } else { \
557 ++dyn; \
558 continue; \
559 } \
560 /* Verify the memory is somewhat sane */ \
561 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
562 if (offset < (Elf ## B ## _Off)elf->len) { \
563 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
564 *r = (char*)(elf->data + offset); \
565 /* cache the length in case we need to nuke this section later on */ \
566 if (fix_elf) \
567 offset = strlen(*r); \
568 /* If quiet, don't output paths in ld.so.conf */ \
569 if (be_quiet) { \
570 size_t len; \
571 char *start, *end; \
572 /* note that we only 'chop' off leading known paths. */ \
573 /* since *r is read-only memory, we can only move the ptr forward. */ \
574 start = *r; \
575 /* scan each path in : delimited list */ \
576 while (start) { \
577 rpath_security_checks(elf, start, get_elfdtype(word)); \
578 end = strchr(start, ':'); \
579 len = (end ? abs(end - start) : strlen(start)); \
580 if (use_ldcache) \
581 for (s = 0; ldpaths[s]; ++s) \
582 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
583 *r = end; \
584 /* corner case ... if RPATH reads "/usr/lib:", we want \
585 * to show ':' rather than '' */ \
586 if (end && end[1] != '\0') \
587 (*r)++; \
588 break; \
589 } \
590 if (!*r || !end) \
591 break; \
592 else \
593 start = start + len + 1; \
594 } \
595 } \
596 if (*r) { \
597 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
598 /* just nuke it */ \
599 nuke_it##B: \
600 memset(*r, 0x00, offset); \
601 *r = NULL; \
602 ESET(dyn->d_tag, DT_DEBUG); \
603 ESET(dyn->d_un.d_ptr, 0); \
604 } else if (fix_elf) { \
605 /* try to clean "bad" paths */ \
606 size_t len, tmpdir_len; \
607 char *start, *end; \
608 const char *tmpdir; \
609 start = *r; \
610 tmpdir = (getenv("TMPDIR") ? : "."); \
611 tmpdir_len = strlen(tmpdir); \
612 while (1) { \
613 end = strchr(start, ':'); \
614 if (start == end) { \
615 eat_this_path##B: \
616 len = strlen(end); \
617 memmove(start, end+1, len); \
618 start[len-1] = '\0'; \
619 end = start - 1; \
620 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
621 if (!end) { \
622 if (start == *r) \
623 goto nuke_it##B; \
624 *--start = '\0'; \
625 } else \
626 goto eat_this_path##B; \
627 } \
628 if (!end) \
629 break; \
630 start = end + 1; \
631 } \
632 if (**r == '\0') \
633 goto nuke_it##B; \
634 } \
635 if (*r) \
636 *found_rpath = 1; \
637 } \
638 } \
639 ++dyn; \
640 } \
641 } }
642 SHOW_RPATH(32)
643 SHOW_RPATH(64)
644 }
645
646 if (be_wewy_wewy_quiet) return;
647
648 if (rpath && runpath) {
649 if (!strcmp(rpath, runpath)) {
650 xstrcat(ret, runpath, ret_len);
651 } else {
652 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
653 xchrcat(ret, '{', ret_len);
654 xstrcat(ret, rpath, ret_len);
655 xchrcat(ret, ',', ret_len);
656 xstrcat(ret, runpath, ret_len);
657 xchrcat(ret, '}', ret_len);
658 }
659 } else if (rpath || runpath)
660 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
661 else if (!be_quiet)
662 xstrcat(ret, " - ", ret_len);
663 }
664
665 #define LDSO_CACHE_MAGIC "ld.so-"
666 #define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
667 #define LDSO_CACHE_VER "1.7.0"
668 #define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
669 #define FLAG_ANY -1
670 #define FLAG_TYPE_MASK 0x00ff
671 #define FLAG_LIBC4 0x0000
672 #define FLAG_ELF 0x0001
673 #define FLAG_ELF_LIBC5 0x0002
674 #define FLAG_ELF_LIBC6 0x0003
675 #define FLAG_REQUIRED_MASK 0xff00
676 #define FLAG_SPARC_LIB64 0x0100
677 #define FLAG_IA64_LIB64 0x0200
678 #define FLAG_X8664_LIB64 0x0300
679 #define FLAG_S390_LIB64 0x0400
680 #define FLAG_POWERPC_LIB64 0x0500
681 #define FLAG_MIPS64_LIBN32 0x0600
682 #define FLAG_MIPS64_LIBN64 0x0700
683
684 static char *lookup_cache_lib(elfobj *, char *);
685
686 #if defined(__GLIBC__) || defined(__UCLIBC__)
687
688 static char *lookup_cache_lib(elfobj *elf, char *fname)
689 {
690 int fd = 0;
691 char *strs;
692 static char buf[__PAX_UTILS_PATH_MAX] = "";
693 const char *cachefile = "/etc/ld.so.cache";
694 struct stat st;
695
696 typedef struct {
697 char magic[LDSO_CACHE_MAGIC_LEN];
698 char version[LDSO_CACHE_VER_LEN];
699 int nlibs;
700 } header_t;
701 header_t *header;
702
703 typedef struct {
704 int flags;
705 int sooffset;
706 int liboffset;
707 } libentry_t;
708 libentry_t *libent;
709
710 if (fname == NULL)
711 return NULL;
712
713 if (ldcache == 0) {
714 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1)
715 return NULL;
716
717 /* cache these values so we only map/unmap the cache file once */
718 ldcache_size = st.st_size;
719 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
720
721 close(fd);
722
723 if (ldcache == (caddr_t)-1) {
724 ldcache = 0;
725 return NULL;
726 }
727
728 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
729 return NULL;
730 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
731 return NULL;
732 }
733
734 header = (header_t *) ldcache;
735 libent = (libentry_t *) (ldcache + sizeof(header_t));
736 strs = (char *) &libent[header->nlibs];
737
738 for (fd = 0; fd < header->nlibs; fd++) {
739 /* this should be more fine grained, but for now we assume that
740 * diff arches will not be cached together. and we ignore the
741 * the different multilib mips cases. */
742 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
743 continue;
744 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
745 continue;
746
747 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
748 continue;
749 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
750 }
751 return buf;
752 }
753 #elif defined(__NetBSD__)
754 static char *lookup_cache_lib(elfobj *elf, char *fname)
755 {
756 static char buf[__PAX_UTILS_PATH_MAX] = "";
757 static struct stat st;
758
759 char **ldpath;
760 for (ldpath = ldpaths; *ldpath != NULL; ldpath++) {
761 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", *ldpath, fname) >= sizeof(buf))
762 continue; /* if the pathname is too long, or something went wrong, ignore */
763
764 if (stat(buf, &st) != 0)
765 continue; /* if the lib doesn't exist in *ldpath, look further */
766
767 /* NetBSD doesn't actually do sanity checks, it just loads the file
768 * and if that doesn't work, continues looking in other directories.
769 * This cannot easily be safely emulated, unfortunately. For now,
770 * just assume that if it exists, it's a valid library. */
771
772 return buf;
773 }
774
775 /* not found in any path */
776 return NULL;
777 }
778 #else
779 #warning Cache support not implemented for your target
780 static char *lookup_cache_lib(elfobj *elf, char *fname)
781 {
782 return NULL;
783 }
784 #endif
785
786 static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
787 {
788 unsigned long i;
789 char *needed;
790 void *strtbl_void;
791 char *p;
792
793 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
794
795 strtbl_void = elf_findsecbyname(elf, ".dynstr");
796
797 if (elf->phdr && strtbl_void) {
798 #define SHOW_NEEDED(B) \
799 if (elf->elf_class == ELFCLASS ## B) { \
800 Elf ## B ## _Dyn *dyn; \
801 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
802 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
803 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
804 Elf ## B ## _Off offset; \
805 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
806 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
807 offset = EGET(phdr[i].p_offset); \
808 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
809 dyn = DYN ## B (elf->data + offset); \
810 while (EGET(dyn->d_tag) != DT_NULL) { \
811 if (EGET(dyn->d_tag) == DT_NEEDED) { \
812 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
813 if (offset >= (Elf ## B ## _Off)elf->len) { \
814 ++dyn; \
815 continue; \
816 } \
817 needed = (char*)(elf->data + offset); \
818 if (op == 0) { \
819 if (!be_wewy_wewy_quiet) { \
820 if (*found_needed) xchrcat(ret, ',', ret_len); \
821 if (use_ldcache) \
822 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
823 needed = p; \
824 xstrcat(ret, needed, ret_len); \
825 } \
826 *found_needed = 1; \
827 } else { \
828 if (!strncmp(find_lib, needed, strlen( !g_match ? needed : find_lib))) { \
829 *found_lib = 1; \
830 return (be_wewy_wewy_quiet ? NULL : needed); \
831 } \
832 } \
833 } \
834 ++dyn; \
835 } \
836 } }
837 SHOW_NEEDED(32)
838 SHOW_NEEDED(64)
839 if (op == 0 && !*found_needed && be_verbose)
840 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
841 }
842
843 return NULL;
844 }
845 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
846 {
847 void *strtbl_void;
848
849 if (!show_interp) return NULL;
850
851 strtbl_void = elf_findsecbyname(elf, ".interp");
852
853 if (strtbl_void) {
854 #define SHOW_INTERP(B) \
855 if (elf->elf_class == ELFCLASS ## B) { \
856 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
857 *found_interp = 1; \
858 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
859 }
860 SHOW_INTERP(32)
861 SHOW_INTERP(64)
862 }
863 return NULL;
864 }
865 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
866 {
867 unsigned long i;
868 struct stat s;
869 char dynamic = 0;
870
871 if (!show_bind) return NULL;
872 if (!elf->phdr) return NULL;
873
874 #define SHOW_BIND(B) \
875 if (elf->elf_class == ELFCLASS ## B) { \
876 Elf ## B ## _Dyn *dyn; \
877 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
878 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
879 Elf ## B ## _Off offset; \
880 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
881 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
882 dynamic = 1; \
883 offset = EGET(phdr[i].p_offset); \
884 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
885 dyn = DYN ## B (elf->data + offset); \
886 while (EGET(dyn->d_tag) != DT_NULL) { \
887 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
888 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
889 { \
890 if (be_quiet) return NULL; \
891 *found_bind = 1; \
892 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
893 } \
894 ++dyn; \
895 } \
896 } \
897 }
898 SHOW_BIND(32)
899 SHOW_BIND(64)
900
901 if (be_wewy_wewy_quiet) return NULL;
902
903 /* don't output anything if quiet mode and the ELF is static or not setuid */
904 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
905 return NULL;
906 } else {
907 *found_bind = 1;
908 return (char *) (dynamic ? "LAZY" : "STATIC");
909 }
910 }
911 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
912 {
913 unsigned long i;
914 char *soname;
915 void *strtbl_void;
916
917 if (!show_soname) return NULL;
918
919 strtbl_void = elf_findsecbyname(elf, ".dynstr");
920
921 if (elf->phdr && strtbl_void) {
922 #define SHOW_SONAME(B) \
923 if (elf->elf_class == ELFCLASS ## B) { \
924 Elf ## B ## _Dyn *dyn; \
925 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
926 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
927 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
928 Elf ## B ## _Off offset; \
929 /* only look for soname in shared objects */ \
930 if (ehdr->e_type != ET_DYN) \
931 return NULL; \
932 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
933 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
934 offset = EGET(phdr[i].p_offset); \
935 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
936 dyn = DYN ## B (elf->data + offset); \
937 while (EGET(dyn->d_tag) != DT_NULL) { \
938 if (EGET(dyn->d_tag) == DT_SONAME) { \
939 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
940 if (offset >= (Elf ## B ## _Off)elf->len) { \
941 ++dyn; \
942 continue; \
943 } \
944 soname = (char*)(elf->data + offset); \
945 *found_soname = 1; \
946 return (be_wewy_wewy_quiet ? NULL : soname); \
947 } \
948 ++dyn; \
949 } \
950 } }
951 SHOW_SONAME(32)
952 SHOW_SONAME(64)
953 }
954
955 return NULL;
956 }
957
958 static char *scanelf_file_sym(elfobj *elf, char *found_sym)
959 {
960 unsigned long i;
961 char *ret;
962 void *symtab_void, *strtab_void;
963
964 if (!find_sym) return NULL;
965 ret = find_sym;
966
967 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
968
969 if (symtab_void && strtab_void) {
970 #define FIND_SYM(B) \
971 if (elf->elf_class == ELFCLASS ## B) { \
972 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
973 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
974 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
975 unsigned long cnt = EGET(symtab->sh_entsize); \
976 char *symname; \
977 if (cnt) \
978 cnt = EGET(symtab->sh_size) / cnt; \
979 for (i = 0; i < cnt; ++i) { \
980 if (sym->st_name) { \
981 /* make sure the symbol name is in acceptable memory range */ \
982 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
983 if ((void*)symname > (void*)elf->data_end) { \
984 warnf("%s: corrupt ELF symbols", elf->filename); \
985 ++sym; \
986 continue; \
987 } \
988 /* debug display ... show all symbols and some extra info */ \
989 if (g_match ? rematch(ret, symname, REG_EXTENDED) == 0 : *ret == '*') { \
990 printf("%s(%s) %5lX %15s %s %s\n", \
991 ((*found_sym == 0) ? "\n\t" : "\t"), \
992 elf->base_filename, \
993 (unsigned long)sym->st_size, \
994 get_elfstttype(sym->st_info), \
995 sym->st_shndx == SHN_UNDEF ? "U" : "D", symname); \
996 *found_sym = 1; \
997 } else { \
998 /* allow the user to specify a comma delimited list of symbols to search for */ \
999 char *this_sym, *this_sym_ver, *next_sym; \
1000 this_sym = ret; \
1001 this_sym_ver = versioned_symname; \
1002 do { \
1003 next_sym = strchr(this_sym, ','); \
1004 if (next_sym == NULL) \
1005 next_sym = this_sym + strlen(this_sym); \
1006 /* do we want a defined symbol ? */ \
1007 if (*this_sym == '+') { \
1008 if (sym->st_shndx == SHN_UNDEF) \
1009 goto skip_this_sym##B; \
1010 ++this_sym; \
1011 ++this_sym_ver; \
1012 /* do we want an undefined symbol ? */ \
1013 } else if (*this_sym == '-') { \
1014 if (sym->st_shndx != SHN_UNDEF) \
1015 goto skip_this_sym##B; \
1016 ++this_sym; \
1017 ++this_sym_ver; \
1018 } \
1019 /* ok, lets compare the name now */ \
1020 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
1021 (strncmp(this_sym_ver, symname, strlen(this_sym_ver)) == 0)) { \
1022 if (be_semi_verbose) { \
1023 char buf[126]; \
1024 snprintf(buf, sizeof(buf), "%lX %s %s", \
1025 (unsigned long)sym->st_size, get_elfstttype(sym->st_info), this_sym); \
1026 ret = buf; \
1027 } else \
1028 ret = this_sym; \
1029 (*found_sym)++; \
1030 goto break_out; \
1031 } \
1032 skip_this_sym##B: this_sym = next_sym + 1; \
1033 } while (*next_sym != '\0'); \
1034 } \
1035 } \
1036 ++sym; \
1037 } }
1038 FIND_SYM(32)
1039 FIND_SYM(64)
1040 }
1041
1042 break_out:
1043 if (be_wewy_wewy_quiet) return NULL;
1044
1045 if (*find_sym != '*' && *found_sym)
1046 return ret;
1047 if (be_quiet)
1048 return NULL;
1049 else
1050 return (char *)" - ";
1051 }
1052
1053
1054 static char *scanelf_file_sections(elfobj *elf, char *found_section)
1055 {
1056 if (!find_section)
1057 return NULL;
1058
1059 #define FIND_SECTION(B) \
1060 if (elf->elf_class == ELFCLASS ## B) { \
1061 int invert; \
1062 Elf ## B ## _Shdr *section; \
1063 invert = (*find_section == '!' ? 1 : 0); \
1064 section = SHDR ## B (elf_findsecbyname(elf, find_section+invert)); \
1065 if ((section == NULL && invert) || (section != NULL && !invert)) \
1066 *found_section = 1; \
1067 }
1068 FIND_SECTION(32)
1069 FIND_SECTION(64)
1070
1071 if (be_wewy_wewy_quiet)
1072 return NULL;
1073
1074 if (*found_section)
1075 return find_section;
1076
1077 if (be_quiet)
1078 return NULL;
1079 else
1080 return (char *)" - ";
1081 }
1082
1083 /* scan an elf file and show all the fun stuff */
1084 #define prints(str) write(fileno(stdout), str, strlen(str))
1085 static int scanelf_elfobj(elfobj *elf)
1086 {
1087 unsigned long i;
1088 char found_pax, found_phdr, found_relro, found_load, found_textrel,
1089 found_rpath, found_needed, found_interp, found_bind, found_soname,
1090 found_sym, found_lib, found_file, found_textrels, found_section;
1091 static char *out_buffer = NULL;
1092 static size_t out_len;
1093
1094 found_pax = found_phdr = found_relro = found_load = found_textrel = \
1095 found_rpath = found_needed = found_interp = found_bind = found_soname = \
1096 found_sym = found_lib = found_file = found_textrels = found_section = 0;
1097
1098 if (be_verbose > 2)
1099 printf("%s: scanning file {%s,%s}\n", elf->filename,
1100 get_elfeitype(EI_CLASS, elf->elf_class),
1101 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
1102 else if (be_verbose > 1)
1103 printf("%s: scanning file\n", elf->filename);
1104
1105 /* init output buffer */
1106 if (!out_buffer) {
1107 out_len = sizeof(char) * 80;
1108 out_buffer = (char*)xmalloc(out_len);
1109 }
1110 *out_buffer = '\0';
1111
1112 /* show the header */
1113 if (!be_quiet && show_banner) {
1114 for (i = 0; out_format[i]; ++i) {
1115 if (!IS_MODIFIER(out_format[i])) continue;
1116
1117 switch (out_format[++i]) {
1118 case '+': break;
1119 case '%': break;
1120 case '#': break;
1121 case 'F':
1122 case 'p':
1123 case 'f': prints("FILE "); found_file = 1; break;
1124 case 'o': prints(" TYPE "); break;
1125 case 'x': prints(" PAX "); break;
1126 case 'e': prints("STK/REL/PTL "); break;
1127 case 't': prints("TEXTREL "); break;
1128 case 'r': prints("RPATH "); break;
1129 case 'M': prints("CLASS "); break;
1130 case 'n': prints("NEEDED "); break;
1131 case 'i': prints("INTERP "); break;
1132 case 'b': prints("BIND "); break;
1133 case 'S': prints("SONAME "); break;
1134 case 's': prints("SYM "); break;
1135 case 'N': prints("LIB "); break;
1136 case 'T': prints("TEXTRELS "); break;
1137 case 'k': prints("SECTION "); break;
1138 case 'a': prints("ARCH "); break;
1139 default: warnf("'%c' has no title ?", out_format[i]);
1140 }
1141 }
1142 if (!found_file) prints("FILE ");
1143 prints("\n");
1144 found_file = 0;
1145 show_banner = 0;
1146 }
1147
1148 /* dump all the good stuff */
1149 for (i = 0; out_format[i]; ++i) {
1150 const char *out;
1151 const char *tmp;
1152
1153 if (!IS_MODIFIER(out_format[i])) {
1154 xchrcat(&out_buffer, out_format[i], &out_len);
1155 continue;
1156 }
1157
1158 out = NULL;
1159 be_wewy_wewy_quiet = (out_format[i] == '#');
1160 be_semi_verbose = (out_format[i] == '+');
1161 switch (out_format[++i]) {
1162 case '+':
1163 case '%':
1164 case '#':
1165 xchrcat(&out_buffer, out_format[i], &out_len); break;
1166 case 'F':
1167 found_file = 1;
1168 if (be_wewy_wewy_quiet) break;
1169 xstrcat(&out_buffer, elf->filename, &out_len);
1170 break;
1171 case 'p':
1172 found_file = 1;
1173 if (be_wewy_wewy_quiet) break;
1174 tmp = elf->filename;
1175 if (search_path) {
1176 ssize_t len_search = strlen(search_path);
1177 ssize_t len_file = strlen(elf->filename);
1178 if (!strncmp(elf->filename, search_path, len_search) && \
1179 len_file > len_search)
1180 tmp += len_search;
1181 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1182 }
1183 xstrcat(&out_buffer, tmp, &out_len);
1184 break;
1185 case 'f':
1186 found_file = 1;
1187 if (be_wewy_wewy_quiet) break;
1188 tmp = strrchr(elf->filename, '/');
1189 tmp = (tmp == NULL ? elf->filename : tmp+1);
1190 xstrcat(&out_buffer, tmp, &out_len);
1191 break;
1192 case 'o': out = get_elfetype(elf); break;
1193 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
1194 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
1195 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1196 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
1197 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1198 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1199 case 'n':
1200 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
1201 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1202 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1203 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
1204 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1205 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1206 case 'a': out = get_elfemtype(elf); break;
1207 default: warnf("'%c' has no scan code?", out_format[i]);
1208 }
1209 if (out) {
1210 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
1211 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
1212 xstrncat(&out_buffer, out, &out_len, (tmp-out));
1213 else
1214 xstrcat(&out_buffer, out, &out_len);
1215 }
1216 }
1217
1218 #define FOUND_SOMETHING() \
1219 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1220 found_rpath || found_needed || found_interp || found_bind || \
1221 found_soname || found_sym || found_lib || found_textrels || found_section )
1222
1223 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1224 xchrcat(&out_buffer, ' ', &out_len);
1225 xstrcat(&out_buffer, elf->filename, &out_len);
1226 }
1227 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
1228 puts(out_buffer);
1229 fflush(stdout);
1230 }
1231
1232 return 0;
1233 }
1234
1235 /* scan a single elf */
1236 static int scanelf_elf(const char *filename, int fd, size_t len)
1237 {
1238 int ret = 1;
1239 elfobj *elf;
1240
1241 /* verify this is real ELF */
1242 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1243 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1244 return ret;
1245 }
1246 switch (match_bits) {
1247 case 32:
1248 if (elf->elf_class != ELFCLASS32)
1249 goto label_done;
1250 break;
1251 case 64:
1252 if (elf->elf_class != ELFCLASS64)
1253 goto label_done;
1254 break;
1255 default: break;
1256 }
1257 if (strlen(match_etypes)) {
1258 char sbuf[126];
1259 strncpy(sbuf, match_etypes, sizeof(sbuf));
1260 if (strchr(match_etypes, ',') != NULL) {
1261 char *p;
1262 while((p = strrchr(sbuf, ',')) != NULL) {
1263 *p = 0;
1264 if (etype_lookup(p+1) == get_etype(elf))
1265 goto label_ret;
1266 }
1267 }
1268 if (etype_lookup(sbuf) != get_etype(elf))
1269 goto label_done;
1270 }
1271
1272 label_ret:
1273 ret = scanelf_elfobj(elf);
1274
1275 label_done:
1276 unreadelf(elf);
1277 return ret;
1278 }
1279
1280 /* scan an archive of elfs */
1281 static int scanelf_archive(const char *filename, int fd, size_t len)
1282 {
1283 archive_handle *ar;
1284 archive_member *m;
1285 char *ar_buffer;
1286 elfobj *elf;
1287
1288 ar = ar_open_fd(filename, fd);
1289 if (ar == NULL)
1290 return 1;
1291
1292 ar_buffer = (char*)mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1293 while ((m=ar_next(ar)) != NULL) {
1294 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size);
1295 if (elf) {
1296 scanelf_elfobj(elf);
1297 unreadelf(elf);
1298 }
1299 }
1300 munmap(ar_buffer, len);
1301
1302 return 0;
1303 }
1304 /* scan a file which may be an elf or an archive or some other magical beast */
1305 static int scanelf_file(const char *filename, const struct stat *st_cache)
1306 {
1307 const struct stat *st = st_cache;
1308 struct stat symlink_st;
1309 int fd;
1310
1311 /* always handle regular files and handle symlinked files if no -y */
1312 if (S_ISLNK(st->st_mode)) {
1313 if (!scan_symlink) return 1;
1314 stat(filename, &symlink_st);
1315 st = &symlink_st;
1316 }
1317
1318 if (!S_ISREG(st->st_mode)) {
1319 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1320 return 1;
1321 }
1322
1323 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1324 return 1;
1325
1326 if (scanelf_elf(filename, fd, st->st_size) == 1 && scan_archives)
1327 /* if it isn't an ELF, maybe it's an .a archive */
1328 scanelf_archive(filename, fd, st->st_size);
1329
1330 close(fd);
1331 return 0;
1332 }
1333
1334 /* scan a directory for ET_EXEC files and print when we find one */
1335 static int scanelf_dir(const char *path)
1336 {
1337 register DIR *dir;
1338 register struct dirent *dentry;
1339 struct stat st_top, st;
1340 char buf[__PAX_UTILS_PATH_MAX];
1341 size_t pathlen = 0, len = 0;
1342 int ret = 0;
1343
1344 /* make sure path exists */
1345 if (lstat(path, &st_top) == -1) {
1346 if (be_verbose > 2) printf("%s: does not exist\n", path);
1347 return 1;
1348 }
1349
1350 /* ok, if it isn't a directory, assume we can open it */
1351 if (!S_ISDIR(st_top.st_mode)) {
1352 return scanelf_file(path, &st_top);
1353 }
1354
1355 /* now scan the dir looking for fun stuff */
1356 if ((dir = opendir(path)) == NULL) {
1357 warnf("could not opendir %s: %s", path, strerror(errno));
1358 return 1;
1359 }
1360 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1361
1362 pathlen = strlen(path);
1363 while ((dentry = readdir(dir))) {
1364 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1365 continue;
1366 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
1367 if (len >= sizeof(buf)) {
1368 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1369 (unsigned long)len, (unsigned long)sizeof(buf));
1370 continue;
1371 }
1372 snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name);
1373 if (lstat(buf, &st) != -1) {
1374 if (S_ISREG(st.st_mode))
1375 ret = scanelf_file(buf, &st);
1376 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1377 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1378 ret = scanelf_dir(buf);
1379 }
1380 }
1381 }
1382 closedir(dir);
1383 return ret;
1384 }
1385
1386 static int scanelf_from_file(const char *filename)
1387 {
1388 FILE *fp = NULL;
1389 char *p;
1390 char path[__PAX_UTILS_PATH_MAX];
1391 int ret = 0;
1392
1393 if (strcmp(filename, "-") == 0)
1394 fp = stdin;
1395 else if ((fp = fopen(filename, "r")) == NULL)
1396 return 1;
1397
1398 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1399 if ((p = strchr(path, '\n')) != NULL)
1400 *p = 0;
1401 search_path = path;
1402 ret = scanelf_dir(path);
1403 }
1404 if (fp != stdin)
1405 fclose(fp);
1406 return ret;
1407 }
1408
1409 #if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1410
1411 static int load_ld_cache_config(int i, const char *fname)
1412 {
1413 FILE *fp = NULL;
1414 char *p;
1415 char path[__PAX_UTILS_PATH_MAX];
1416
1417 if (i + 1 == ARRAY_SIZE(ldpaths))
1418 return i;
1419
1420 if ((fp = fopen(fname, "r")) == NULL)
1421 return i;
1422
1423 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1424 if ((p = strrchr(path, '\r')) != NULL)
1425 *p = 0;
1426 if ((p = strchr(path, '\n')) != NULL)
1427 *p = 0;
1428 #ifdef __linux__
1429 // recursive includes of the same file will make this segfault.
1430 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1431 glob64_t gl;
1432 size_t x;
1433 char gpath[__PAX_UTILS_PATH_MAX];
1434
1435 memset(gpath, 0, sizeof(gpath));
1436
1437 if (path[8] != '/')
1438 snprintf(gpath, sizeof(gpath), "/etc/%s", &path[8]);
1439 else
1440 strncpy(gpath, &path[8], sizeof(gpath));
1441
1442 if ((glob64(gpath, 0, NULL, &gl)) == 0) {
1443 for (x = 0; x < gl.gl_pathc; ++x) {
1444 /* try to avoid direct loops */
1445 if (strcmp(gl.gl_pathv[x], fname) == 0)
1446 continue;
1447 i = load_ld_cache_config(i, gl.gl_pathv[x]);
1448 if (i + 1 >= ARRAY_SIZE(ldpaths)) {
1449 globfree64(&gl);
1450 return i;
1451 }
1452 }
1453 globfree64 (&gl);
1454 continue;
1455 }
1456 }
1457 #endif
1458 if (*path != '/')
1459 continue;
1460
1461 ldpaths[i++] = xstrdup(path);
1462
1463 if (i + 1 == ARRAY_SIZE(ldpaths))
1464 break;
1465 }
1466 ldpaths[i] = NULL;
1467
1468 fclose(fp);
1469 return i;
1470 }
1471
1472 #elif defined(__FreeBSD__) || (__DragonFly__)
1473
1474 static int load_ld_cache_config(int i, const char *fname)
1475 {
1476 FILE *fp = NULL;
1477 char *b = NULL, *p;
1478 struct elfhints_hdr hdr;
1479
1480 if (i + 1 == ARRAY_SIZE(ldpaths))
1481 return i;
1482
1483 if ((fp = fopen(fname, "r")) == NULL)
1484 return i;
1485
1486 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1487 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1488 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1489 {
1490 fclose(fp);
1491 return i;
1492 }
1493
1494 b = (char*)malloc(hdr.dirlistlen+1);
1495 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1496 fclose(fp);
1497 free(b);
1498 return i;
1499 }
1500
1501 while ((p = strsep(&b, ":"))) {
1502 if (*p == '\0') continue;
1503 ldpaths[i++] = xstrdup(p);
1504
1505 if (i + 1 == ARRAY_SIZE(ldpaths))
1506 break;
1507 }
1508 ldpaths[i] = NULL;
1509
1510 free(b);
1511 fclose(fp);
1512 return i;
1513 }
1514
1515 #else
1516
1517 #warning Cache config support not implemented for your target
1518 static int load_ld_cache_config(int i, const char *fname)
1519 {
1520 memset(ldpaths, 0x00, sizeof(ldpaths));
1521 }
1522
1523 #endif
1524
1525 /* scan /etc/ld.so.conf for paths */
1526 static void scanelf_ldpath()
1527 {
1528 char scan_l, scan_ul, scan_ull;
1529 int i = 0;
1530
1531 if (!ldpaths[0])
1532 err("Unable to load any paths from ld.so.conf");
1533
1534 scan_l = scan_ul = scan_ull = 0;
1535
1536 while (ldpaths[i]) {
1537 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
1538 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
1539 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
1540 scanelf_dir(ldpaths[i]);
1541 ++i;
1542 }
1543
1544 if (!scan_l) scanelf_dir("/lib");
1545 if (!scan_ul) scanelf_dir("/usr/lib");
1546 if (!scan_ull) scanelf_dir("/usr/local/lib");
1547 }
1548
1549 /* scan env PATH for paths */
1550 static void scanelf_envpath()
1551 {
1552 char *path, *p;
1553
1554 path = getenv("PATH");
1555 if (!path)
1556 err("PATH is not set in your env !");
1557 path = xstrdup(path);
1558
1559 while ((p = strrchr(path, ':')) != NULL) {
1560 scanelf_dir(p + 1);
1561 *p = 0;
1562 }
1563
1564 free(path);
1565 }
1566
1567 /* usage / invocation handling functions */
1568 #define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:BhV"
1569 #define a_argument required_argument
1570 static struct option const long_opts[] = {
1571 {"path", no_argument, NULL, 'p'},
1572 {"ldpath", no_argument, NULL, 'l'},
1573 {"recursive", no_argument, NULL, 'R'},
1574 {"mount", no_argument, NULL, 'm'},
1575 {"symlink", no_argument, NULL, 'y'},
1576 {"archives", no_argument, NULL, 'A'},
1577 {"ldcache", no_argument, NULL, 'L'},
1578 {"fix", no_argument, NULL, 'X'},
1579 {"setpax", a_argument, NULL, 'z'},
1580 {"pax", no_argument, NULL, 'x'},
1581 {"header", no_argument, NULL, 'e'},
1582 {"textrel", no_argument, NULL, 't'},
1583 {"rpath", no_argument, NULL, 'r'},
1584 {"needed", no_argument, NULL, 'n'},
1585 {"interp", no_argument, NULL, 'i'},
1586 {"bind", no_argument, NULL, 'b'},
1587 {"soname", no_argument, NULL, 'S'},
1588 {"symbol", a_argument, NULL, 's'},
1589 {"section", a_argument, NULL, 'k'},
1590 {"lib", a_argument, NULL, 'N'},
1591 {"gmatch", no_argument, NULL, 'g'},
1592 {"textrels", no_argument, NULL, 'T'},
1593 {"etype", a_argument, NULL, 'E'},
1594 {"bits", a_argument, NULL, 'M'},
1595 {"all", no_argument, NULL, 'a'},
1596 {"quiet", no_argument, NULL, 'q'},
1597 {"verbose", no_argument, NULL, 'v'},
1598 {"format", a_argument, NULL, 'F'},
1599 {"from", a_argument, NULL, 'f'},
1600 {"file", a_argument, NULL, 'o'},
1601 {"nobanner", no_argument, NULL, 'B'},
1602 {"help", no_argument, NULL, 'h'},
1603 {"version", no_argument, NULL, 'V'},
1604 {NULL, no_argument, NULL, 0x0}
1605 };
1606
1607 static const char *opts_help[] = {
1608 "Scan all directories in PATH environment",
1609 "Scan all directories in /etc/ld.so.conf",
1610 "Scan directories recursively",
1611 "Don't recursively cross mount points",
1612 "Don't scan symlinks",
1613 "Scan archives (.a files)",
1614 "Utilize ld.so.cache information (use with -r/-n)",
1615 "Try and 'fix' bad things (use with -r/-e)",
1616 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1617 "Print PaX markings",
1618 "Print GNU_STACK/PT_LOAD markings",
1619 "Print TEXTREL information",
1620 "Print RPATH information",
1621 "Print NEEDED information",
1622 "Print INTERP information",
1623 "Print BIND information",
1624 "Print SONAME information",
1625 "Find a specified symbol",
1626 "Find a specified section",
1627 "Find a specified library",
1628 "Use strncmp to match libraries. (use with -N)",
1629 "Locate cause of TEXTREL",
1630 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1631 "Print only ELF files matching numeric bits",
1632 "Print all scanned info (-x -e -t -r -b)\n",
1633 "Only output 'bad' things",
1634 "Be verbose (can be specified more than once)",
1635 "Use specified format for output",
1636 "Read input stream from a filename",
1637 "Write output stream to a filename",
1638 "Don't display the header",
1639 "Print this help and exit",
1640 "Print version and exit",
1641 NULL
1642 };
1643
1644 /* display usage and exit */
1645 static void usage(int status)
1646 {
1647 unsigned long i;
1648 printf("* Scan ELF binaries for stuff\n\n"
1649 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1650 printf("Options: -[%s]\n", PARSE_FLAGS);
1651 for (i = 0; long_opts[i].name; ++i)
1652 if (long_opts[i].has_arg == no_argument)
1653 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
1654 long_opts[i].name, opts_help[i]);
1655 else
1656 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
1657 long_opts[i].name, opts_help[i]);
1658
1659 puts("\nFor more information, see the scanelf(1) manpage");
1660 exit(status);
1661 }
1662
1663 /* parse command line arguments and preform needed actions */
1664 #define do_pax_state(option, flag) \
1665 if (islower(option)) { \
1666 flags &= ~PF_##flag; \
1667 flags |= PF_NO##flag; \
1668 } else { \
1669 flags &= ~PF_NO##flag; \
1670 flags |= PF_##flag; \
1671 }
1672 static int parseargs(int argc, char *argv[])
1673 {
1674 int i;
1675 const char *from_file = NULL;
1676 int ret = 0;
1677
1678 opterr = 0;
1679 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1680 switch (i) {
1681
1682 case 'V':
1683 printf("pax-utils-%s: %s compiled %s\n%s\n"
1684 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
1685 VERSION, __FILE__, __DATE__, rcsid, argv0);
1686 exit(EXIT_SUCCESS);
1687 break;
1688 case 'h': usage(EXIT_SUCCESS); break;
1689 case 'f':
1690 if (from_file) warn("You prob don't want to specify -f twice");
1691 from_file = optarg;
1692 break;
1693 case 'E':
1694 strncpy(match_etypes, optarg, sizeof(match_etypes));
1695 break;
1696 case 'M':
1697 match_bits = atoi(optarg);
1698 break;
1699 case 'o': {
1700 if (freopen(optarg, "w", stdout) == NULL)
1701 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1702 break;
1703 }
1704 case 'k':
1705 if (find_section) warn("You prob don't want to specify -k twice");
1706 find_section = optarg;
1707 break;
1708 case 's': {
1709 if (find_sym) warn("You prob don't want to specify -s twice");
1710 find_sym = optarg;
1711 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1712 sprintf(versioned_symname, "%s@", find_sym);
1713 break;
1714 }
1715 case 'N': {
1716 if (find_lib) warn("You prob don't want to specify -N twice");
1717 find_lib = optarg;
1718 break;
1719 }
1720
1721 case 'F': {
1722 if (out_format) warn("You prob don't want to specify -F twice");
1723 out_format = optarg;
1724 break;
1725 }
1726 case 'z': {
1727 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1728 size_t x;
1729
1730 for (x = 0 ; x < strlen(optarg); x++) {
1731 switch(optarg[x]) {
1732 case 'p':
1733 case 'P':
1734 do_pax_state(optarg[x], PAGEEXEC);
1735 break;
1736 case 's':
1737 case 'S':
1738 do_pax_state(optarg[x], SEGMEXEC);
1739 break;
1740 case 'm':
1741 case 'M':
1742 do_pax_state(optarg[x], MPROTECT);
1743 break;
1744 case 'e':
1745 case 'E':
1746 do_pax_state(optarg[x], EMUTRAMP);
1747 break;
1748 case 'r':
1749 case 'R':
1750 do_pax_state(optarg[x], RANDMMAP);
1751 break;
1752 case 'x':
1753 case 'X':
1754 do_pax_state(optarg[x], RANDEXEC);
1755 break;
1756 default:
1757 break;
1758 }
1759 }
1760 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
1761 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
1762 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
1763 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
1764 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1765 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1766 setpax = flags;
1767 break;
1768 }
1769 case 'g': g_match = 1; break;
1770 case 'L': use_ldcache = 1; break;
1771 case 'y': scan_symlink = 0; break;
1772 case 'A': scan_archives = 1; break;
1773 case 'B': show_banner = 0; break;
1774 case 'l': scan_ldpath = 1; break;
1775 case 'p': scan_envpath = 1; break;
1776 case 'R': dir_recurse = 1; break;
1777 case 'm': dir_crossmount = 0; break;
1778 case 'X': ++fix_elf; break;
1779 case 'x': show_pax = 1; break;
1780 case 'e': show_phdr = 1; break;
1781 case 't': show_textrel = 1; break;
1782 case 'r': show_rpath = 1; break;
1783 case 'n': show_needed = 1; break;
1784 case 'i': show_interp = 1; break;
1785 case 'b': show_bind = 1; break;
1786 case 'S': show_soname = 1; break;
1787 case 'T': show_textrels = 1; break;
1788 case 'q': be_quiet = 1; break;
1789 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1790 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
1791
1792 case ':':
1793 err("Option '%c' is missing parameter", optopt);
1794 case '?':
1795 err("Unknown option '%c' or argument missing", optopt);
1796 default:
1797 err("Unhandled option '%c'; please report this", i);
1798 }
1799 }
1800 if (show_textrels && be_verbose) {
1801 if (which("objdump") != NULL)
1802 has_objdump = 1;
1803 }
1804 /* let the format option override all other options */
1805 if (out_format) {
1806 show_pax = show_phdr = show_textrel = show_rpath = \
1807 show_needed = show_interp = show_bind = show_soname = \
1808 show_textrels = 0;
1809 for (i = 0; out_format[i]; ++i) {
1810 if (!IS_MODIFIER(out_format[i])) continue;
1811
1812 switch (out_format[++i]) {
1813 case '+': break;
1814 case '%': break;
1815 case '#': break;
1816 case 'F': break;
1817 case 'p': break;
1818 case 'f': break;
1819 case 'k': break;
1820 case 's': break;
1821 case 'N': break;
1822 case 'o': break;
1823 case 'a': break;
1824 case 'M': break;
1825 case 'x': show_pax = 1; break;
1826 case 'e': show_phdr = 1; break;
1827 case 't': show_textrel = 1; break;
1828 case 'r': show_rpath = 1; break;
1829 case 'n': show_needed = 1; break;
1830 case 'i': show_interp = 1; break;
1831 case 'b': show_bind = 1; break;
1832 case 'S': show_soname = 1; break;
1833 case 'T': show_textrels = 1; break;
1834 default:
1835 err("Invalid format specifier '%c' (byte %i)",
1836 out_format[i], i+1);
1837 }
1838 }
1839
1840 /* construct our default format */
1841 } else {
1842 size_t fmt_len = 30;
1843 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
1844 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1845 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1846 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1847 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1848 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1849 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1850 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1851 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1852 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1853 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1854 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1855 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1856 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1857 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1858 }
1859 if (be_verbose > 2) printf("Format: %s\n", out_format);
1860
1861 /* now lets actually do the scanning */
1862 if (scan_ldpath || use_ldcache)
1863 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
1864 if (scan_ldpath) scanelf_ldpath();
1865 if (scan_envpath) scanelf_envpath();
1866 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
1867 from_file = "-";
1868 if (from_file) {
1869 scanelf_from_file(from_file);
1870 from_file = *argv;
1871 }
1872 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1873 err("Nothing to scan !?");
1874 while (optind < argc) {
1875 search_path = argv[optind++];
1876 ret = scanelf_dir(search_path);
1877 }
1878
1879 /* clean up */
1880 free(versioned_symname);
1881 for (i = 0; ldpaths[i]; ++i)
1882 free(ldpaths[i]);
1883
1884 if (ldcache != 0)
1885 munmap(ldcache, ldcache_size);
1886 return ret;
1887 }
1888
1889 static char **get_split_env(const char *envvar)
1890 {
1891 const char *delims = " \t\n";
1892 char **envvals = NULL;
1893 char *env, *s;
1894 int nentry;
1895
1896 if ((env = getenv(envvar)) == NULL)
1897 return NULL;
1898
1899 env = xstrdup(env);
1900 if (env == NULL)
1901 return NULL;
1902
1903 s = strtok(env, delims);
1904 if (s == NULL) {
1905 free(env);
1906 return NULL;
1907 }
1908
1909 nentry = 0;
1910 while (s != NULL) {
1911 ++nentry;
1912 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
1913 envvals[nentry-1] = s;
1914 s = strtok(NULL, delims);
1915 }
1916 envvals[nentry] = NULL;
1917
1918 /* don't want to free(env) as it contains the memory that backs
1919 * the envvals array of strings */
1920 return envvals;
1921 }
1922 static void parseenv()
1923 {
1924 qa_textrels = get_split_env("QA_TEXTRELS");
1925 qa_execstack = get_split_env("QA_EXECSTACK");
1926 qa_wx_load = get_split_env("QA_WX_LOAD");
1927 }
1928
1929 #ifdef __PAX_UTILS_CLEANUP
1930 static void cleanup()
1931 {
1932 free(out_format);
1933 free(qa_textrels);
1934 free(qa_execstack);
1935 free(qa_wx_load);
1936 }
1937 #endif
1938
1939
1940 int main(int argc, char *argv[])
1941 {
1942 int ret;
1943 if (argc < 2)
1944 usage(EXIT_FAILURE);
1945 parseenv();
1946 ret = parseargs(argc, argv);
1947 fclose(stdout);
1948 #ifdef __PAX_UTILS_CLEANUP
1949 cleanup();
1950 warn("The calls to add/delete heap should be off:\n"
1951 "\t- 1 due to the out_buffer not being freed in scanelf_file()\n"
1952 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
1953 #endif
1954 return ret;
1955 }
1956
1957
1958
1959 /* utility funcs */
1960 static char *xstrdup(const char *s)
1961 {
1962 char *ret = strdup(s);
1963 if (!ret) err("Could not strdup(): %s", strerror(errno));
1964 return ret;
1965 }
1966 static void *xmalloc(size_t size)
1967 {
1968 void *ret = malloc(size);
1969 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1970 return ret;
1971 }
1972 static void *xrealloc(void *ptr, size_t size)
1973 {
1974 void *ret = realloc(ptr, size);
1975 if (!ret) err("Could not realloc() %li bytes", (unsigned long)size);
1976 return ret;
1977 }
1978 static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
1979 {
1980 size_t new_len;
1981
1982 new_len = strlen(*dst) + strlen(src);
1983 if (*curr_len <= new_len) {
1984 *curr_len = new_len + (*curr_len / 2);
1985 *dst = realloc(*dst, *curr_len);
1986 if (!*dst)
1987 err("could not realloc() %li bytes", (unsigned long)*curr_len);
1988 }
1989
1990 if (n)
1991 strncat(*dst, src, n);
1992 else
1993 strcat(*dst, src);
1994 }
1995 static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1996 {
1997 static char my_app[2];
1998 my_app[0] = append;
1999 my_app[1] = '\0';
2000 xstrcat(dst, my_app, curr_len);
2001 }
2002
2003 /* Match filename against entries in matchlist, return TRUE
2004 * if the file is listed */
2005 static int file_matches_list(const char *filename, char **matchlist)
2006 {
2007 char **file;
2008 char *match;
2009 char buf[__PAX_UTILS_PATH_MAX];
2010
2011 if (matchlist == NULL)
2012 return 0;
2013
2014 for (file = matchlist; *file != NULL; file++) {
2015 if (search_path) {
2016 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2017 match = buf;
2018 } else {
2019 match = *file;
2020 }
2021 if (fnmatch(match, filename, 0) == 0)
2022 return 1;
2023 }
2024 return 0;
2025 }

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