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Revision 1.180 - (show annotations) (download) (as text)
Sat Jun 9 21:43:53 2007 UTC (7 years, 2 months ago) by solar
Branch: MAIN
Changes since 1.179: +35 -5 lines
File MIME type: text/x-csrc
- Print only ELF files with matching specified octal bits (like 755)

1 /*
2 * Copyright 2003-2007 Gentoo Foundation
3 * Distributed under the terms of the GNU General Public License v2
4 * $Header: /var/cvsroot/gentoo-projects/pax-utils/scanelf.c,v 1.179 2007/06/09 18:54:44 solar Exp $
5 *
6 * Copyright 2003-2007 Ned Ludd - <solar@gentoo.org>
7 * Copyright 2004-2007 Mike Frysinger - <vapier@gentoo.org>
8 */
9
10 #include "paxinc.h"
11
12 static const char *rcsid = "$Id: scanelf.c,v 1.179 2007/06/09 18:54:44 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_perms = 0;
49 static char show_phdr = 0;
50 static char show_textrel = 0;
51 static char show_rpath = 0;
52 static char show_needed = 0;
53 static char show_interp = 0;
54 static char show_bind = 0;
55 static char show_soname = 0;
56 static char show_textrels = 0;
57 static char show_banner = 1;
58 static char be_quiet = 0;
59 static char be_verbose = 0;
60 static char be_wewy_wewy_quiet = 0;
61 static char be_semi_verbose = 0;
62 static char *find_sym = NULL, *versioned_symname = NULL;
63 static char *find_lib = NULL;
64 static char *find_section = NULL;
65 static char *out_format = NULL;
66 static char *search_path = NULL;
67 static char fix_elf = 0;
68 static char g_match = 0;
69 static char use_ldcache = 0;
70
71 static char **qa_textrels = NULL;
72 static char **qa_execstack = NULL;
73 static char **qa_wx_load = NULL;
74
75 int match_bits = 0;
76 unsigned int match_perms = 0;
77 caddr_t ldcache = 0;
78 size_t ldcache_size = 0;
79 unsigned long setpax = 0UL;
80
81 int has_objdump = 0;
82
83 static char *getstr_perms(const char *fname);
84 static char *getstr_perms(const char *fname) {
85 struct stat st;
86 static char buf[8];
87
88 if ((stat(fname, &st)) == (-1))
89 return (char *) "";
90
91 snprintf(buf, sizeof(buf), "%o", st.st_mode);
92
93 return (char *) buf + 2;
94 }
95
96 /* find the path to a file by name */
97 static char *which(const char *fname)
98 {
99 static char fullpath[BUFSIZ];
100 char *path, *p;
101
102 path = getenv("PATH");
103 if (!path)
104 return NULL;
105
106 path = xstrdup(path);
107 while ((p = strrchr(path, ':')) != NULL) {
108 snprintf(fullpath, sizeof(fullpath), "%s/%s", p + 1, fname);
109 *p = 0;
110 if (access(fullpath, R_OK) != (-1)) {
111 free(path);
112 return (char *) fullpath;
113 }
114 }
115 free(path);
116 return NULL;
117 }
118
119 /* 1 on failure. 0 otherwise */
120 static int rematch(const char *regex, const char *match, int cflags)
121 {
122 regex_t preg;
123 int ret;
124
125 if ((match == NULL) || (regex == NULL))
126 return EXIT_FAILURE;
127
128
129 if ((ret = regcomp(&preg, regex, cflags))) {
130 char err[256];
131
132 if (regerror(ret, &preg, err, sizeof(err)))
133 fprintf(stderr, "regcomp failed: %s", err);
134 else
135 fprintf(stderr, "regcomp failed");
136
137 return EXIT_FAILURE;
138 }
139 ret = regexec(&preg, match, 0, NULL, 0);
140 regfree(&preg);
141
142 return ret;
143 }
144
145 /* sub-funcs for scanelf_file() */
146 static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
147 {
148 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
149 #define GET_SYMTABS(B) \
150 if (elf->elf_class == ELFCLASS ## B) { \
151 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
152 /* debug sections */ \
153 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
154 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
155 /* runtime sections */ \
156 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
157 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
158 if (symtab && dynsym) { \
159 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \
160 } else { \
161 *sym = (void*)(symtab ? symtab : dynsym); \
162 } \
163 if (strtab && dynstr) { \
164 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \
165 } else { \
166 *tab = (void*)(strtab ? strtab : dynstr); \
167 } \
168 }
169 GET_SYMTABS(32)
170 GET_SYMTABS(64)
171 }
172
173 static char *scanelf_file_pax(elfobj *elf, char *found_pax)
174 {
175 static char ret[7];
176 unsigned long i, shown;
177
178 if (!show_pax) return NULL;
179
180 shown = 0;
181 memset(&ret, 0, sizeof(ret));
182
183 if (elf->phdr) {
184 #define SHOW_PAX(B) \
185 if (elf->elf_class == ELFCLASS ## B) { \
186 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
187 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
188 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
189 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
190 continue; \
191 if (fix_elf && setpax) { \
192 /* set the paxctl flags */ \
193 ESET(phdr[i].p_flags, setpax); \
194 } \
195 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
196 continue; \
197 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
198 *found_pax = 1; \
199 ++shown; \
200 break; \
201 } \
202 }
203 SHOW_PAX(32)
204 SHOW_PAX(64)
205 }
206
207
208 if (fix_elf && setpax) {
209 /* set the chpax settings */
210 if (elf->elf_class == ELFCLASS32) {
211 if (EHDR32(elf->ehdr)->e_type == ET_DYN || EHDR32(elf->ehdr)->e_type == ET_EXEC)
212 ESET(EHDR32(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
213 } else {
214 if (EHDR64(elf->ehdr)->e_type == ET_DYN || EHDR64(elf->ehdr)->e_type == ET_EXEC)
215 ESET(EHDR64(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
216 }
217 }
218
219 /* fall back to EI_PAX if no PT_PAX was found */
220 if (!*ret) {
221 static char *paxflags;
222 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
223 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
224 *found_pax = 1;
225 return (be_wewy_wewy_quiet ? NULL : paxflags);
226 }
227 strncpy(ret, paxflags, sizeof(ret));
228 }
229
230 if (be_wewy_wewy_quiet || (be_quiet && !shown))
231 return NULL;
232 else
233 return ret;
234 }
235
236 static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
237 {
238 static char ret[12];
239 char *found;
240 unsigned long i, shown, multi_stack, multi_relro, multi_load;
241 int max_pt_load;
242
243 if (!show_phdr) return NULL;
244
245 memcpy(ret, "--- --- ---\0", 12);
246
247 shown = 0;
248 multi_stack = multi_relro = multi_load = 0;
249 max_pt_load = elf_max_pt_load(elf);
250
251 #define NOTE_GNU_STACK ".note.GNU-stack"
252 #define SHOW_PHDR(B) \
253 if (elf->elf_class == ELFCLASS ## B) { \
254 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
255 Elf ## B ## _Off offset; \
256 uint32_t flags, check_flags; \
257 if (elf->phdr != NULL) { \
258 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
259 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
260 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
261 if (multi_stack++) \
262 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
263 if (file_matches_list(elf->filename, qa_execstack)) \
264 continue; \
265 found = found_phdr; \
266 offset = 0; \
267 check_flags = PF_X; \
268 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
269 if (multi_relro++) \
270 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
271 found = found_relro; \
272 offset = 4; \
273 check_flags = PF_X; \
274 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
275 if (ehdr->e_type == ET_DYN || ehdr->e_type == ET_EXEC) \
276 if (multi_load++ > max_pt_load) \
277 warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
278 if (file_matches_list(elf->filename, qa_wx_load)) \
279 continue; \
280 found = found_load; \
281 offset = 8; \
282 check_flags = PF_W|PF_X; \
283 } else \
284 continue; \
285 flags = EGET(phdr[i].p_flags); \
286 if (be_quiet && ((flags & check_flags) != check_flags)) \
287 continue; \
288 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
289 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
290 ret[3] = ret[7] = '!'; \
291 flags = EGET(phdr[i].p_flags); \
292 } \
293 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
294 *found = 1; \
295 ++shown; \
296 } \
297 } else if (elf->shdr != NULL) { \
298 /* no program headers which means this is prob an object file */ \
299 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
300 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
301 char *str; \
302 if ((void*)strtbl > (void*)elf->data_end) \
303 goto skip_this_shdr##B; \
304 check_flags = SHF_WRITE|SHF_EXECINSTR; \
305 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
306 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
307 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
308 str = elf->data + offset; \
309 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
310 if (!strcmp(str, NOTE_GNU_STACK)) { \
311 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
312 flags = EGET(shdr[i].sh_flags); \
313 if (be_quiet && ((flags & check_flags) != check_flags)) \
314 continue; \
315 ++*found_phdr; \
316 shown = 1; \
317 if (flags & SHF_WRITE) ret[0] = 'W'; \
318 if (flags & SHF_ALLOC) ret[1] = 'A'; \
319 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
320 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
321 break; \
322 } \
323 } \
324 skip_this_shdr##B: \
325 if (!multi_stack) { \
326 if (file_matches_list(elf->filename, qa_execstack)) \
327 return NULL; \
328 *found_phdr = 1; \
329 shown = 1; \
330 memcpy(ret, "!WX", 3); \
331 } \
332 } \
333 }
334 SHOW_PHDR(32)
335 SHOW_PHDR(64)
336
337 if (be_wewy_wewy_quiet || (be_quiet && !shown))
338 return NULL;
339 else
340 return ret;
341 }
342
343 static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
344 {
345 static const char *ret = "TEXTREL";
346 unsigned long i;
347
348 if (!show_textrel && !show_textrels) return NULL;
349
350 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
351
352 if (elf->phdr) {
353 #define SHOW_TEXTREL(B) \
354 if (elf->elf_class == ELFCLASS ## B) { \
355 Elf ## B ## _Dyn *dyn; \
356 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
357 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
358 Elf ## B ## _Off offset; \
359 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
360 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
361 offset = EGET(phdr[i].p_offset); \
362 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
363 dyn = DYN ## B (elf->data + offset); \
364 while (EGET(dyn->d_tag) != DT_NULL) { \
365 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
366 *found_textrel = 1; \
367 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
368 return (be_wewy_wewy_quiet ? NULL : ret); \
369 } \
370 ++dyn; \
371 } \
372 } }
373 SHOW_TEXTREL(32)
374 SHOW_TEXTREL(64)
375 }
376
377 if (be_quiet || be_wewy_wewy_quiet)
378 return NULL;
379 else
380 return " - ";
381 }
382
383 static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
384 {
385 unsigned long s, r, rmax;
386 void *symtab_void, *strtab_void, *text_void;
387
388 if (!show_textrels) return NULL;
389
390 /* don't search for TEXTREL's if the ELF doesn't have any */
391 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
392 if (!*found_textrel) return NULL;
393
394 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
395 text_void = elf_findsecbyname(elf, ".text");
396
397 if (symtab_void && strtab_void && text_void && elf->shdr) {
398 #define SHOW_TEXTRELS(B) \
399 if (elf->elf_class == ELFCLASS ## B) { \
400 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
401 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
402 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
403 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
404 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
405 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
406 uint ## B ## _t memsz = EGET(text->sh_size); \
407 Elf ## B ## _Rel *rel; \
408 Elf ## B ## _Rela *rela; \
409 /* search the section headers for relocations */ \
410 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
411 uint32_t sh_type = EGET(shdr[s].sh_type); \
412 if (sh_type == SHT_REL) { \
413 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \
414 rela = NULL; \
415 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
416 } else if (sh_type == SHT_RELA) { \
417 rel = NULL; \
418 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \
419 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
420 } else \
421 continue; \
422 /* now see if any of the relocs are in the .text */ \
423 for (r = 0; r < rmax; ++r) { \
424 unsigned long sym_max; \
425 Elf ## B ## _Addr offset_tmp; \
426 Elf ## B ## _Sym *func; \
427 Elf ## B ## _Sym *sym; \
428 Elf ## B ## _Addr r_offset; \
429 uint ## B ## _t r_info; \
430 if (sh_type == SHT_REL) { \
431 r_offset = EGET(rel[r].r_offset); \
432 r_info = EGET(rel[r].r_info); \
433 } else { \
434 r_offset = EGET(rela[r].r_offset); \
435 r_info = EGET(rela[r].r_info); \
436 } \
437 /* make sure this relocation is inside of the .text */ \
438 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
439 if (be_verbose <= 2) continue; \
440 } else \
441 *found_textrels = 1; \
442 /* locate this relocation symbol name */ \
443 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
444 if ((void*)sym > (void*)elf->data_end) { \
445 warn("%s: corrupt ELF symbol", elf->filename); \
446 continue; \
447 } \
448 sym_max = ELF ## B ## _R_SYM(r_info); \
449 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
450 sym += sym_max; \
451 else \
452 sym = NULL; \
453 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
454 /* show the raw details about this reloc */ \
455 printf(" %s: ", elf->base_filename); \
456 if (sym && sym->st_name) \
457 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \
458 else \
459 printf("(memory/data?)"); \
460 printf(" [0x%lX]", (unsigned long)r_offset); \
461 /* now try to find the closest symbol that this rel is probably in */ \
462 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
463 func = NULL; \
464 offset_tmp = 0; \
465 while (sym_max--) { \
466 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
467 func = sym; \
468 offset_tmp = EGET(sym->st_value); \
469 } \
470 ++sym; \
471 } \
472 printf(" in "); \
473 if (func && func->st_name) { \
474 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
475 if (r_offset > EGET(func->st_size)) \
476 printf("(optimized out: previous %s)", func_name); \
477 else \
478 printf("%s", func_name); \
479 } else \
480 printf("(optimized out)"); \
481 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
482 if (be_verbose && has_objdump) { \
483 char *sysbuf; \
484 size_t syslen; \
485 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"; \
486 syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
487 sysbuf = xmalloc(syslen); \
488 if (sysbuf) { \
489 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
490 if (end_addr < r_offset) \
491 /* not uncommon when things are optimized out */ \
492 end_addr = r_offset + 0x100; \
493 snprintf(sysbuf, syslen, sysfmt, \
494 (unsigned long)offset_tmp, \
495 (unsigned long)end_addr, \
496 elf->filename, \
497 (unsigned long)r_offset); \
498 fflush(stdout); \
499 system(sysbuf); \
500 fflush(stdout); \
501 free(sysbuf); \
502 } \
503 } \
504 } \
505 } }
506 SHOW_TEXTRELS(32)
507 SHOW_TEXTRELS(64)
508 }
509 if (!*found_textrels)
510 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
511
512 return NULL;
513 }
514
515 static void rpath_security_checks(elfobj *, char *, const char *);
516 static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
517 {
518 struct stat st;
519 switch (*item) {
520 case '/': break;
521 case '.':
522 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
523 break;
524 case ':':
525 case '\0':
526 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
527 break;
528 case '$':
529 if (fstat(elf->fd, &st) != -1)
530 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
531 warnf("Security problem with %s='%s' in %s with mode set of %o",
532 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
533 break;
534 default:
535 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
536 break;
537 }
538 }
539 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
540 {
541 unsigned long i, s;
542 char *rpath, *runpath, **r;
543 void *strtbl_void;
544
545 if (!show_rpath) return;
546
547 strtbl_void = elf_findsecbyname(elf, ".dynstr");
548 rpath = runpath = NULL;
549
550 if (elf->phdr && strtbl_void) {
551 #define SHOW_RPATH(B) \
552 if (elf->elf_class == ELFCLASS ## B) { \
553 Elf ## B ## _Dyn *dyn; \
554 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
555 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
556 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
557 Elf ## B ## _Off offset; \
558 Elf ## B ## _Xword word; \
559 /* Scan all the program headers */ \
560 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
561 /* Just scan dynamic headers */ \
562 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
563 offset = EGET(phdr[i].p_offset); \
564 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
565 /* Just scan dynamic RPATH/RUNPATH headers */ \
566 dyn = DYN ## B (elf->data + offset); \
567 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
568 if (word == DT_RPATH) { \
569 r = &rpath; \
570 } else if (word == DT_RUNPATH) { \
571 r = &runpath; \
572 } else { \
573 ++dyn; \
574 continue; \
575 } \
576 /* Verify the memory is somewhat sane */ \
577 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
578 if (offset < (Elf ## B ## _Off)elf->len) { \
579 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
580 *r = (char*)(elf->data + offset); \
581 /* cache the length in case we need to nuke this section later on */ \
582 if (fix_elf) \
583 offset = strlen(*r); \
584 /* If quiet, don't output paths in ld.so.conf */ \
585 if (be_quiet) { \
586 size_t len; \
587 char *start, *end; \
588 /* note that we only 'chop' off leading known paths. */ \
589 /* since *r is read-only memory, we can only move the ptr forward. */ \
590 start = *r; \
591 /* scan each path in : delimited list */ \
592 while (start) { \
593 rpath_security_checks(elf, start, get_elfdtype(word)); \
594 end = strchr(start, ':'); \
595 len = (end ? abs(end - start) : strlen(start)); \
596 if (use_ldcache) \
597 for (s = 0; ldpaths[s]; ++s) \
598 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
599 *r = end; \
600 /* corner case ... if RPATH reads "/usr/lib:", we want \
601 * to show ':' rather than '' */ \
602 if (end && end[1] != '\0') \
603 (*r)++; \
604 break; \
605 } \
606 if (!*r || !end) \
607 break; \
608 else \
609 start = start + len + 1; \
610 } \
611 } \
612 if (*r) { \
613 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
614 /* just nuke it */ \
615 nuke_it##B: \
616 memset(*r, 0x00, offset); \
617 *r = NULL; \
618 ESET(dyn->d_tag, DT_DEBUG); \
619 ESET(dyn->d_un.d_ptr, 0); \
620 } else if (fix_elf) { \
621 /* try to clean "bad" paths */ \
622 size_t len, tmpdir_len; \
623 char *start, *end; \
624 const char *tmpdir; \
625 start = *r; \
626 tmpdir = (getenv("TMPDIR") ? : "."); \
627 tmpdir_len = strlen(tmpdir); \
628 while (1) { \
629 end = strchr(start, ':'); \
630 if (start == end) { \
631 eat_this_path##B: \
632 len = strlen(end); \
633 memmove(start, end+1, len); \
634 start[len-1] = '\0'; \
635 end = start - 1; \
636 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
637 if (!end) { \
638 if (start == *r) \
639 goto nuke_it##B; \
640 *--start = '\0'; \
641 } else \
642 goto eat_this_path##B; \
643 } \
644 if (!end) \
645 break; \
646 start = end + 1; \
647 } \
648 if (**r == '\0') \
649 goto nuke_it##B; \
650 } \
651 if (*r) \
652 *found_rpath = 1; \
653 } \
654 } \
655 ++dyn; \
656 } \
657 } }
658 SHOW_RPATH(32)
659 SHOW_RPATH(64)
660 }
661
662 if (be_wewy_wewy_quiet) return;
663
664 if (rpath && runpath) {
665 if (!strcmp(rpath, runpath)) {
666 xstrcat(ret, runpath, ret_len);
667 } else {
668 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
669 xchrcat(ret, '{', ret_len);
670 xstrcat(ret, rpath, ret_len);
671 xchrcat(ret, ',', ret_len);
672 xstrcat(ret, runpath, ret_len);
673 xchrcat(ret, '}', ret_len);
674 }
675 } else if (rpath || runpath)
676 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
677 else if (!be_quiet)
678 xstrcat(ret, " - ", ret_len);
679 }
680
681 #define LDSO_CACHE_MAGIC "ld.so-"
682 #define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
683 #define LDSO_CACHE_VER "1.7.0"
684 #define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
685 #define FLAG_ANY -1
686 #define FLAG_TYPE_MASK 0x00ff
687 #define FLAG_LIBC4 0x0000
688 #define FLAG_ELF 0x0001
689 #define FLAG_ELF_LIBC5 0x0002
690 #define FLAG_ELF_LIBC6 0x0003
691 #define FLAG_REQUIRED_MASK 0xff00
692 #define FLAG_SPARC_LIB64 0x0100
693 #define FLAG_IA64_LIB64 0x0200
694 #define FLAG_X8664_LIB64 0x0300
695 #define FLAG_S390_LIB64 0x0400
696 #define FLAG_POWERPC_LIB64 0x0500
697 #define FLAG_MIPS64_LIBN32 0x0600
698 #define FLAG_MIPS64_LIBN64 0x0700
699
700 static char *lookup_cache_lib(elfobj *, char *);
701
702 #if defined(__GLIBC__) || defined(__UCLIBC__)
703
704 static char *lookup_cache_lib(elfobj *elf, char *fname)
705 {
706 int fd = 0;
707 char *strs;
708 static char buf[__PAX_UTILS_PATH_MAX] = "";
709 const char *cachefile = "/etc/ld.so.cache";
710 struct stat st;
711
712 typedef struct {
713 char magic[LDSO_CACHE_MAGIC_LEN];
714 char version[LDSO_CACHE_VER_LEN];
715 int nlibs;
716 } header_t;
717 header_t *header;
718
719 typedef struct {
720 int flags;
721 int sooffset;
722 int liboffset;
723 } libentry_t;
724 libentry_t *libent;
725
726 if (fname == NULL)
727 return NULL;
728
729 if (ldcache == 0) {
730 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1)
731 return NULL;
732
733 /* cache these values so we only map/unmap the cache file once */
734 ldcache_size = st.st_size;
735 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
736
737 close(fd);
738
739 if (ldcache == (caddr_t)-1) {
740 ldcache = 0;
741 return NULL;
742 }
743
744 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
745 return NULL;
746 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
747 return NULL;
748 }
749
750 header = (header_t *) ldcache;
751 libent = (libentry_t *) (ldcache + sizeof(header_t));
752 strs = (char *) &libent[header->nlibs];
753
754 for (fd = 0; fd < header->nlibs; fd++) {
755 /* this should be more fine grained, but for now we assume that
756 * diff arches will not be cached together. and we ignore the
757 * the different multilib mips cases. */
758 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
759 continue;
760 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
761 continue;
762
763 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
764 continue;
765 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
766 }
767 return buf;
768 }
769 #elif defined(__NetBSD__)
770 static char *lookup_cache_lib(elfobj *elf, char *fname)
771 {
772 static char buf[__PAX_UTILS_PATH_MAX] = "";
773 static struct stat st;
774
775 char **ldpath;
776 for (ldpath = ldpaths; *ldpath != NULL; ldpath++) {
777 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", *ldpath, fname) >= sizeof(buf))
778 continue; /* if the pathname is too long, or something went wrong, ignore */
779
780 if (stat(buf, &st) != 0)
781 continue; /* if the lib doesn't exist in *ldpath, look further */
782
783 /* NetBSD doesn't actually do sanity checks, it just loads the file
784 * and if that doesn't work, continues looking in other directories.
785 * This cannot easily be safely emulated, unfortunately. For now,
786 * just assume that if it exists, it's a valid library. */
787
788 return buf;
789 }
790
791 /* not found in any path */
792 return NULL;
793 }
794 #else
795 #warning Cache support not implemented for your target
796 static char *lookup_cache_lib(elfobj *elf, char *fname)
797 {
798 return NULL;
799 }
800 #endif
801
802 static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
803 {
804 unsigned long i;
805 char *needed;
806 void *strtbl_void;
807 char *p;
808
809 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
810
811 strtbl_void = elf_findsecbyname(elf, ".dynstr");
812
813 if (elf->phdr && strtbl_void) {
814 #define SHOW_NEEDED(B) \
815 if (elf->elf_class == ELFCLASS ## B) { \
816 Elf ## B ## _Dyn *dyn; \
817 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
818 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
819 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
820 Elf ## B ## _Off offset; \
821 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
822 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
823 offset = EGET(phdr[i].p_offset); \
824 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
825 dyn = DYN ## B (elf->data + offset); \
826 while (EGET(dyn->d_tag) != DT_NULL) { \
827 if (EGET(dyn->d_tag) == DT_NEEDED) { \
828 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
829 if (offset >= (Elf ## B ## _Off)elf->len) { \
830 ++dyn; \
831 continue; \
832 } \
833 needed = (char*)(elf->data + offset); \
834 if (op == 0) { \
835 if (!be_wewy_wewy_quiet) { \
836 if (*found_needed) xchrcat(ret, ',', ret_len); \
837 if (use_ldcache) \
838 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
839 needed = p; \
840 xstrcat(ret, needed, ret_len); \
841 } \
842 *found_needed = 1; \
843 } else { \
844 if (!strncmp(find_lib, needed, strlen( !g_match ? needed : find_lib))) { \
845 *found_lib = 1; \
846 return (be_wewy_wewy_quiet ? NULL : needed); \
847 } \
848 } \
849 } \
850 ++dyn; \
851 } \
852 } }
853 SHOW_NEEDED(32)
854 SHOW_NEEDED(64)
855 if (op == 0 && !*found_needed && be_verbose)
856 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
857 }
858
859 return NULL;
860 }
861 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
862 {
863 void *strtbl_void;
864
865 if (!show_interp) return NULL;
866
867 strtbl_void = elf_findsecbyname(elf, ".interp");
868
869 if (strtbl_void) {
870 #define SHOW_INTERP(B) \
871 if (elf->elf_class == ELFCLASS ## B) { \
872 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
873 *found_interp = 1; \
874 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
875 }
876 SHOW_INTERP(32)
877 SHOW_INTERP(64)
878 }
879 return NULL;
880 }
881 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
882 {
883 unsigned long i;
884 struct stat s;
885 char dynamic = 0;
886
887 if (!show_bind) return NULL;
888 if (!elf->phdr) return NULL;
889
890 #define SHOW_BIND(B) \
891 if (elf->elf_class == ELFCLASS ## B) { \
892 Elf ## B ## _Dyn *dyn; \
893 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
894 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
895 Elf ## B ## _Off offset; \
896 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
897 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
898 dynamic = 1; \
899 offset = EGET(phdr[i].p_offset); \
900 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
901 dyn = DYN ## B (elf->data + offset); \
902 while (EGET(dyn->d_tag) != DT_NULL) { \
903 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
904 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
905 { \
906 if (be_quiet) return NULL; \
907 *found_bind = 1; \
908 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
909 } \
910 ++dyn; \
911 } \
912 } \
913 }
914 SHOW_BIND(32)
915 SHOW_BIND(64)
916
917 if (be_wewy_wewy_quiet) return NULL;
918
919 /* don't output anything if quiet mode and the ELF is static or not setuid */
920 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
921 return NULL;
922 } else {
923 *found_bind = 1;
924 return (char *) (dynamic ? "LAZY" : "STATIC");
925 }
926 }
927 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
928 {
929 unsigned long i;
930 char *soname;
931 void *strtbl_void;
932
933 if (!show_soname) return NULL;
934
935 strtbl_void = elf_findsecbyname(elf, ".dynstr");
936
937 if (elf->phdr && strtbl_void) {
938 #define SHOW_SONAME(B) \
939 if (elf->elf_class == ELFCLASS ## B) { \
940 Elf ## B ## _Dyn *dyn; \
941 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
942 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
943 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
944 Elf ## B ## _Off offset; \
945 /* only look for soname in shared objects */ \
946 if (ehdr->e_type != ET_DYN) \
947 return NULL; \
948 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
949 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
950 offset = EGET(phdr[i].p_offset); \
951 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
952 dyn = DYN ## B (elf->data + offset); \
953 while (EGET(dyn->d_tag) != DT_NULL) { \
954 if (EGET(dyn->d_tag) == DT_SONAME) { \
955 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
956 if (offset >= (Elf ## B ## _Off)elf->len) { \
957 ++dyn; \
958 continue; \
959 } \
960 soname = (char*)(elf->data + offset); \
961 *found_soname = 1; \
962 return (be_wewy_wewy_quiet ? NULL : soname); \
963 } \
964 ++dyn; \
965 } \
966 } }
967 SHOW_SONAME(32)
968 SHOW_SONAME(64)
969 }
970
971 return NULL;
972 }
973
974 static char *scanelf_file_sym(elfobj *elf, char *found_sym)
975 {
976 unsigned long i;
977 char *ret;
978 void *symtab_void, *strtab_void;
979
980 if (!find_sym) return NULL;
981 ret = find_sym;
982
983 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
984
985 if (symtab_void && strtab_void) {
986 #define FIND_SYM(B) \
987 if (elf->elf_class == ELFCLASS ## B) { \
988 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
989 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
990 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
991 unsigned long cnt = EGET(symtab->sh_entsize); \
992 char *symname; \
993 if (cnt) \
994 cnt = EGET(symtab->sh_size) / cnt; \
995 for (i = 0; i < cnt; ++i) { \
996 if (sym->st_name) { \
997 /* make sure the symbol name is in acceptable memory range */ \
998 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
999 if ((void*)symname > (void*)elf->data_end) { \
1000 warnf("%s: corrupt ELF symbols", elf->filename); \
1001 ++sym; \
1002 continue; \
1003 } \
1004 /* debug display ... show all symbols and some extra info */ \
1005 if (g_match ? rematch(ret, symname, REG_EXTENDED) == 0 : *ret == '*') { \
1006 printf("%s(%s) %5lX %15s %s %s\n", \
1007 ((*found_sym == 0) ? "\n\t" : "\t"), \
1008 elf->base_filename, \
1009 (unsigned long)sym->st_size, \
1010 get_elfstttype(sym->st_info), \
1011 sym->st_shndx == SHN_UNDEF ? "U" : "D", symname); \
1012 *found_sym = 1; \
1013 } else { \
1014 /* allow the user to specify a comma delimited list of symbols to search for */ \
1015 char *this_sym, *this_sym_ver, *next_sym; \
1016 this_sym = ret; \
1017 this_sym_ver = versioned_symname; \
1018 do { \
1019 next_sym = strchr(this_sym, ','); \
1020 if (next_sym == NULL) \
1021 next_sym = this_sym + strlen(this_sym); \
1022 /* do we want a defined symbol ? */ \
1023 if (*this_sym == '+') { \
1024 if (sym->st_shndx == SHN_UNDEF) \
1025 goto skip_this_sym##B; \
1026 ++this_sym; \
1027 ++this_sym_ver; \
1028 /* do we want an undefined symbol ? */ \
1029 } else if (*this_sym == '-') { \
1030 if (sym->st_shndx != SHN_UNDEF) \
1031 goto skip_this_sym##B; \
1032 ++this_sym; \
1033 ++this_sym_ver; \
1034 } \
1035 /* ok, lets compare the name now */ \
1036 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
1037 (strncmp(this_sym_ver, symname, strlen(this_sym_ver)) == 0)) { \
1038 if (be_semi_verbose) { \
1039 char buf[126]; \
1040 snprintf(buf, sizeof(buf), "%lX %s %s", \
1041 (unsigned long)sym->st_size, get_elfstttype(sym->st_info), this_sym); \
1042 ret = buf; \
1043 } else \
1044 ret = this_sym; \
1045 (*found_sym)++; \
1046 goto break_out; \
1047 } \
1048 skip_this_sym##B: this_sym = next_sym + 1; \
1049 } while (*next_sym != '\0'); \
1050 } \
1051 } \
1052 ++sym; \
1053 } }
1054 FIND_SYM(32)
1055 FIND_SYM(64)
1056 }
1057
1058 break_out:
1059 if (be_wewy_wewy_quiet) return NULL;
1060
1061 if (*find_sym != '*' && *found_sym)
1062 return ret;
1063 if (be_quiet)
1064 return NULL;
1065 else
1066 return (char *)" - ";
1067 }
1068
1069
1070 static char *scanelf_file_sections(elfobj *elf, char *found_section)
1071 {
1072 if (!find_section)
1073 return NULL;
1074
1075 #define FIND_SECTION(B) \
1076 if (elf->elf_class == ELFCLASS ## B) { \
1077 int invert; \
1078 Elf ## B ## _Shdr *section; \
1079 invert = (*find_section == '!' ? 1 : 0); \
1080 section = SHDR ## B (elf_findsecbyname(elf, find_section+invert)); \
1081 if ((section == NULL && invert) || (section != NULL && !invert)) \
1082 *found_section = 1; \
1083 }
1084 FIND_SECTION(32)
1085 FIND_SECTION(64)
1086
1087 if (be_wewy_wewy_quiet)
1088 return NULL;
1089
1090 if (*found_section)
1091 return find_section;
1092
1093 if (be_quiet)
1094 return NULL;
1095 else
1096 return (char *)" - ";
1097 }
1098
1099 /* scan an elf file and show all the fun stuff */
1100 #define prints(str) write(fileno(stdout), str, strlen(str))
1101 static int scanelf_elfobj(elfobj *elf)
1102 {
1103 unsigned long i;
1104 char found_pax, found_phdr, found_relro, found_load, found_textrel,
1105 found_rpath, found_needed, found_interp, found_bind, found_soname,
1106 found_sym, found_lib, found_file, found_textrels, found_section;
1107 static char *out_buffer = NULL;
1108 static size_t out_len;
1109
1110 found_pax = found_phdr = found_relro = found_load = found_textrel = \
1111 found_rpath = found_needed = found_interp = found_bind = found_soname = \
1112 found_sym = found_lib = found_file = found_textrels = found_section = 0;
1113
1114 if (be_verbose > 2)
1115 printf("%s: scanning file {%s,%s}\n", elf->filename,
1116 get_elfeitype(EI_CLASS, elf->elf_class),
1117 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
1118 else if (be_verbose > 1)
1119 printf("%s: scanning file\n", elf->filename);
1120
1121 /* init output buffer */
1122 if (!out_buffer) {
1123 out_len = sizeof(char) * 80;
1124 out_buffer = (char*)xmalloc(out_len);
1125 }
1126 *out_buffer = '\0';
1127
1128 /* show the header */
1129 if (!be_quiet && show_banner) {
1130 for (i = 0; out_format[i]; ++i) {
1131 if (!IS_MODIFIER(out_format[i])) continue;
1132
1133 switch (out_format[++i]) {
1134 case '+': break;
1135 case '%': break;
1136 case '#': break;
1137 case 'F':
1138 case 'p':
1139 case 'f': prints("FILE "); found_file = 1; break;
1140 case 'o': prints(" TYPE "); break;
1141 case 'x': prints(" PAX "); break;
1142 case 'e': prints("STK/REL/PTL "); break;
1143 case 't': prints("TEXTREL "); break;
1144 case 'r': prints("RPATH "); break;
1145 case 'M': prints("CLASS "); break;
1146 case 'n': prints("NEEDED "); break;
1147 case 'i': prints("INTERP "); break;
1148 case 'b': prints("BIND "); break;
1149 case 'S': prints("SONAME "); break;
1150 case 's': prints("SYM "); break;
1151 case 'N': prints("LIB "); break;
1152 case 'T': prints("TEXTRELS "); break;
1153 case 'k': prints("SECTION "); break;
1154 case 'a': prints("ARCH "); break;
1155 case 'O': prints("PERM "); break;
1156 default: warnf("'%c' has no title ?", out_format[i]);
1157 }
1158 }
1159 if (!found_file) prints("FILE ");
1160 prints("\n");
1161 found_file = 0;
1162 show_banner = 0;
1163 }
1164
1165 /* dump all the good stuff */
1166 for (i = 0; out_format[i]; ++i) {
1167 const char *out;
1168 const char *tmp;
1169
1170 if (!IS_MODIFIER(out_format[i])) {
1171 xchrcat(&out_buffer, out_format[i], &out_len);
1172 continue;
1173 }
1174
1175 out = NULL;
1176 be_wewy_wewy_quiet = (out_format[i] == '#');
1177 be_semi_verbose = (out_format[i] == '+');
1178 switch (out_format[++i]) {
1179 case '+':
1180 case '%':
1181 case '#':
1182 xchrcat(&out_buffer, out_format[i], &out_len); break;
1183 case 'F':
1184 found_file = 1;
1185 if (be_wewy_wewy_quiet) break;
1186 xstrcat(&out_buffer, elf->filename, &out_len);
1187 break;
1188 case 'p':
1189 found_file = 1;
1190 if (be_wewy_wewy_quiet) break;
1191 tmp = elf->filename;
1192 if (search_path) {
1193 ssize_t len_search = strlen(search_path);
1194 ssize_t len_file = strlen(elf->filename);
1195 if (!strncmp(elf->filename, search_path, len_search) && \
1196 len_file > len_search)
1197 tmp += len_search;
1198 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1199 }
1200 xstrcat(&out_buffer, tmp, &out_len);
1201 break;
1202 case 'f':
1203 found_file = 1;
1204 if (be_wewy_wewy_quiet) break;
1205 tmp = strrchr(elf->filename, '/');
1206 tmp = (tmp == NULL ? elf->filename : tmp+1);
1207 xstrcat(&out_buffer, tmp, &out_len);
1208 break;
1209 case 'o': out = get_elfetype(elf); break;
1210 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
1211 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
1212 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1213 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
1214 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1215 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1216 case 'O': out = getstr_perms(elf->filename); break;
1217 case 'n':
1218 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
1219 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1220 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1221 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
1222 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1223 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1224 case 'a': out = get_elfemtype(elf); break;
1225 default: warnf("'%c' has no scan code?", out_format[i]);
1226 }
1227 if (out) {
1228 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
1229 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
1230 xstrncat(&out_buffer, out, &out_len, (tmp-out));
1231 else
1232 xstrcat(&out_buffer, out, &out_len);
1233 }
1234 }
1235
1236 #define FOUND_SOMETHING() \
1237 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1238 found_rpath || found_needed || found_interp || found_bind || \
1239 found_soname || found_sym || found_lib || found_textrels || found_section )
1240
1241 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1242 xchrcat(&out_buffer, ' ', &out_len);
1243 xstrcat(&out_buffer, elf->filename, &out_len);
1244 }
1245 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
1246 puts(out_buffer);
1247 fflush(stdout);
1248 }
1249
1250 return 0;
1251 }
1252
1253 /* scan a single elf */
1254 static int scanelf_elf(const char *filename, int fd, size_t len)
1255 {
1256 int ret = 1;
1257 elfobj *elf;
1258
1259 /* verify this is real ELF */
1260 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1261 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1262 return ret;
1263 }
1264 switch (match_bits) {
1265 case 32:
1266 if (elf->elf_class != ELFCLASS32)
1267 goto label_done;
1268 break;
1269 case 64:
1270 if (elf->elf_class != ELFCLASS64)
1271 goto label_done;
1272 break;
1273 default: break;
1274 }
1275 if (strlen(match_etypes)) {
1276 char sbuf[126];
1277 strncpy(sbuf, match_etypes, sizeof(sbuf));
1278 if (strchr(match_etypes, ',') != NULL) {
1279 char *p;
1280 while((p = strrchr(sbuf, ',')) != NULL) {
1281 *p = 0;
1282 if (etype_lookup(p+1) == get_etype(elf))
1283 goto label_ret;
1284 }
1285 }
1286 if (etype_lookup(sbuf) != get_etype(elf))
1287 goto label_done;
1288 }
1289
1290 label_ret:
1291 ret = scanelf_elfobj(elf);
1292
1293 label_done:
1294 unreadelf(elf);
1295 return ret;
1296 }
1297
1298 /* scan an archive of elfs */
1299 static int scanelf_archive(const char *filename, int fd, size_t len)
1300 {
1301 archive_handle *ar;
1302 archive_member *m;
1303 char *ar_buffer;
1304 elfobj *elf;
1305
1306 ar = ar_open_fd(filename, fd);
1307 if (ar == NULL)
1308 return 1;
1309
1310 ar_buffer = (char*)mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1311 while ((m=ar_next(ar)) != NULL) {
1312 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size);
1313 if (elf) {
1314 scanelf_elfobj(elf);
1315 unreadelf(elf);
1316 }
1317 }
1318 munmap(ar_buffer, len);
1319
1320 return 0;
1321 }
1322 /* scan a file which may be an elf or an archive or some other magical beast */
1323 static int scanelf_file(const char *filename, const struct stat *st_cache)
1324 {
1325 const struct stat *st = st_cache;
1326 struct stat symlink_st;
1327 int fd;
1328
1329 /* always handle regular files and handle symlinked files if no -y */
1330 if (S_ISLNK(st->st_mode)) {
1331 if (!scan_symlink) return 1;
1332 stat(filename, &symlink_st);
1333 st = &symlink_st;
1334 }
1335
1336 if (!S_ISREG(st->st_mode)) {
1337 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1338 return 1;
1339 }
1340
1341 if (match_perms) {
1342 if ((st->st_mode | match_perms) != st->st_mode)
1343 return 1;
1344 }
1345 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1346 return 1;
1347
1348 if (scanelf_elf(filename, fd, st->st_size) == 1 && scan_archives)
1349 /* if it isn't an ELF, maybe it's an .a archive */
1350 scanelf_archive(filename, fd, st->st_size);
1351
1352 close(fd);
1353 return 0;
1354 }
1355
1356 /* scan a directory for ET_EXEC files and print when we find one */
1357 static int scanelf_dir(const char *path)
1358 {
1359 register DIR *dir;
1360 register struct dirent *dentry;
1361 struct stat st_top, st;
1362 char buf[__PAX_UTILS_PATH_MAX];
1363 size_t pathlen = 0, len = 0;
1364 int ret = 0;
1365
1366 /* make sure path exists */
1367 if (lstat(path, &st_top) == -1) {
1368 if (be_verbose > 2) printf("%s: does not exist\n", path);
1369 return 1;
1370 }
1371
1372 /* ok, if it isn't a directory, assume we can open it */
1373 if (!S_ISDIR(st_top.st_mode)) {
1374 return scanelf_file(path, &st_top);
1375 }
1376
1377 /* now scan the dir looking for fun stuff */
1378 if ((dir = opendir(path)) == NULL) {
1379 warnf("could not opendir %s: %s", path, strerror(errno));
1380 return 1;
1381 }
1382 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1383
1384 pathlen = strlen(path);
1385 while ((dentry = readdir(dir))) {
1386 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1387 continue;
1388 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
1389 if (len >= sizeof(buf)) {
1390 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1391 (unsigned long)len, (unsigned long)sizeof(buf));
1392 continue;
1393 }
1394 snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name);
1395 if (lstat(buf, &st) != -1) {
1396 if (S_ISREG(st.st_mode))
1397 ret = scanelf_file(buf, &st);
1398 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1399 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1400 ret = scanelf_dir(buf);
1401 }
1402 }
1403 }
1404 closedir(dir);
1405 return ret;
1406 }
1407
1408 static int scanelf_from_file(const char *filename)
1409 {
1410 FILE *fp = NULL;
1411 char *p;
1412 char path[__PAX_UTILS_PATH_MAX];
1413 int ret = 0;
1414
1415 if (strcmp(filename, "-") == 0)
1416 fp = stdin;
1417 else if ((fp = fopen(filename, "r")) == NULL)
1418 return 1;
1419
1420 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1421 if ((p = strchr(path, '\n')) != NULL)
1422 *p = 0;
1423 search_path = path;
1424 ret = scanelf_dir(path);
1425 }
1426 if (fp != stdin)
1427 fclose(fp);
1428 return ret;
1429 }
1430
1431 #if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1432
1433 static int load_ld_cache_config(int i, const char *fname)
1434 {
1435 FILE *fp = NULL;
1436 char *p;
1437 char path[__PAX_UTILS_PATH_MAX];
1438
1439 if (i + 1 == ARRAY_SIZE(ldpaths))
1440 return i;
1441
1442 if ((fp = fopen(fname, "r")) == NULL)
1443 return i;
1444
1445 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1446 if ((p = strrchr(path, '\r')) != NULL)
1447 *p = 0;
1448 if ((p = strchr(path, '\n')) != NULL)
1449 *p = 0;
1450 #ifdef __linux__
1451 // recursive includes of the same file will make this segfault.
1452 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1453 glob64_t gl;
1454 size_t x;
1455 char gpath[__PAX_UTILS_PATH_MAX];
1456
1457 memset(gpath, 0, sizeof(gpath));
1458
1459 if (path[8] != '/')
1460 snprintf(gpath, sizeof(gpath), "/etc/%s", &path[8]);
1461 else
1462 strncpy(gpath, &path[8], sizeof(gpath));
1463
1464 if ((glob64(gpath, 0, NULL, &gl)) == 0) {
1465 for (x = 0; x < gl.gl_pathc; ++x) {
1466 /* try to avoid direct loops */
1467 if (strcmp(gl.gl_pathv[x], fname) == 0)
1468 continue;
1469 i = load_ld_cache_config(i, gl.gl_pathv[x]);
1470 if (i + 1 >= ARRAY_SIZE(ldpaths)) {
1471 globfree64(&gl);
1472 return i;
1473 }
1474 }
1475 globfree64 (&gl);
1476 continue;
1477 }
1478 }
1479 #endif
1480 if (*path != '/')
1481 continue;
1482
1483 ldpaths[i++] = xstrdup(path);
1484
1485 if (i + 1 == ARRAY_SIZE(ldpaths))
1486 break;
1487 }
1488 ldpaths[i] = NULL;
1489
1490 fclose(fp);
1491 return i;
1492 }
1493
1494 #elif defined(__FreeBSD__) || (__DragonFly__)
1495
1496 static int load_ld_cache_config(int i, const char *fname)
1497 {
1498 FILE *fp = NULL;
1499 char *b = NULL, *p;
1500 struct elfhints_hdr hdr;
1501
1502 if (i + 1 == ARRAY_SIZE(ldpaths))
1503 return i;
1504
1505 if ((fp = fopen(fname, "r")) == NULL)
1506 return i;
1507
1508 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1509 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1510 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1511 {
1512 fclose(fp);
1513 return i;
1514 }
1515
1516 b = (char*)malloc(hdr.dirlistlen+1);
1517 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1518 fclose(fp);
1519 free(b);
1520 return i;
1521 }
1522
1523 while ((p = strsep(&b, ":"))) {
1524 if (*p == '\0') continue;
1525 ldpaths[i++] = xstrdup(p);
1526
1527 if (i + 1 == ARRAY_SIZE(ldpaths))
1528 break;
1529 }
1530 ldpaths[i] = NULL;
1531
1532 free(b);
1533 fclose(fp);
1534 return i;
1535 }
1536
1537 #else
1538
1539 #warning Cache config support not implemented for your target
1540 static int load_ld_cache_config(int i, const char *fname)
1541 {
1542 memset(ldpaths, 0x00, sizeof(ldpaths));
1543 }
1544
1545 #endif
1546
1547 /* scan /etc/ld.so.conf for paths */
1548 static void scanelf_ldpath()
1549 {
1550 char scan_l, scan_ul, scan_ull;
1551 int i = 0;
1552
1553 if (!ldpaths[0])
1554 err("Unable to load any paths from ld.so.conf");
1555
1556 scan_l = scan_ul = scan_ull = 0;
1557
1558 while (ldpaths[i]) {
1559 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
1560 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
1561 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
1562 scanelf_dir(ldpaths[i]);
1563 ++i;
1564 }
1565
1566 if (!scan_l) scanelf_dir("/lib");
1567 if (!scan_ul) scanelf_dir("/usr/lib");
1568 if (!scan_ull) scanelf_dir("/usr/local/lib");
1569 }
1570
1571 /* scan env PATH for paths */
1572 static void scanelf_envpath()
1573 {
1574 char *path, *p;
1575
1576 path = getenv("PATH");
1577 if (!path)
1578 err("PATH is not set in your env !");
1579 path = xstrdup(path);
1580
1581 while ((p = strrchr(path, ':')) != NULL) {
1582 scanelf_dir(p + 1);
1583 *p = 0;
1584 }
1585
1586 free(path);
1587 }
1588
1589 /* usage / invocation handling functions */
1590 #define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:O:BhV"
1591 #define a_argument required_argument
1592 static struct option const long_opts[] = {
1593 {"path", no_argument, NULL, 'p'},
1594 {"ldpath", no_argument, NULL, 'l'},
1595 {"recursive", no_argument, NULL, 'R'},
1596 {"mount", no_argument, NULL, 'm'},
1597 {"symlink", no_argument, NULL, 'y'},
1598 {"archives", no_argument, NULL, 'A'},
1599 {"ldcache", no_argument, NULL, 'L'},
1600 {"fix", no_argument, NULL, 'X'},
1601 {"setpax", a_argument, NULL, 'z'},
1602 {"pax", no_argument, NULL, 'x'},
1603 {"header", no_argument, NULL, 'e'},
1604 {"textrel", no_argument, NULL, 't'},
1605 {"rpath", no_argument, NULL, 'r'},
1606 {"needed", no_argument, NULL, 'n'},
1607 {"interp", no_argument, NULL, 'i'},
1608 {"bind", no_argument, NULL, 'b'},
1609 {"soname", no_argument, NULL, 'S'},
1610 {"symbol", a_argument, NULL, 's'},
1611 {"section", a_argument, NULL, 'k'},
1612 {"lib", a_argument, NULL, 'N'},
1613 {"gmatch", no_argument, NULL, 'g'},
1614 {"textrels", no_argument, NULL, 'T'},
1615 {"etype", a_argument, NULL, 'E'},
1616 {"bits", a_argument, NULL, 'M'},
1617 {"perms", a_argument, NULL, 'O'},
1618 {"all", no_argument, NULL, 'a'},
1619 {"quiet", no_argument, NULL, 'q'},
1620 {"verbose", no_argument, NULL, 'v'},
1621 {"format", a_argument, NULL, 'F'},
1622 {"from", a_argument, NULL, 'f'},
1623 {"file", a_argument, NULL, 'o'},
1624 {"nobanner", no_argument, NULL, 'B'},
1625 {"help", no_argument, NULL, 'h'},
1626 {"version", no_argument, NULL, 'V'},
1627 {NULL, no_argument, NULL, 0x0}
1628 };
1629
1630 static const char *opts_help[] = {
1631 "Scan all directories in PATH environment",
1632 "Scan all directories in /etc/ld.so.conf",
1633 "Scan directories recursively",
1634 "Don't recursively cross mount points",
1635 "Don't scan symlinks",
1636 "Scan archives (.a files)",
1637 "Utilize ld.so.cache information (use with -r/-n)",
1638 "Try and 'fix' bad things (use with -r/-e)",
1639 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1640 "Print PaX markings",
1641 "Print GNU_STACK/PT_LOAD markings",
1642 "Print TEXTREL information",
1643 "Print RPATH information",
1644 "Print NEEDED information",
1645 "Print INTERP information",
1646 "Print BIND information",
1647 "Print SONAME information",
1648 "Find a specified symbol",
1649 "Find a specified section",
1650 "Find a specified library",
1651 "Use strncmp to match libraries. (use with -N)",
1652 "Locate cause of TEXTREL",
1653 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1654 "Print only ELF files matching numeric bits",
1655 "Print only ELF files matching octal permissions",
1656 "Print all scanned info (-x -e -t -r -b)\n",
1657 "Only output 'bad' things",
1658 "Be verbose (can be specified more than once)",
1659 "Use specified format for output",
1660 "Read input stream from a filename",
1661 "Write output stream to a filename",
1662 "Don't display the header",
1663 "Print this help and exit",
1664 "Print version and exit",
1665 NULL
1666 };
1667
1668 /* display usage and exit */
1669 static void usage(int status)
1670 {
1671 unsigned long i;
1672 printf("* Scan ELF binaries for stuff\n\n"
1673 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1674 printf("Options: -[%s]\n", PARSE_FLAGS);
1675 for (i = 0; long_opts[i].name; ++i)
1676 if (long_opts[i].has_arg == no_argument)
1677 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
1678 long_opts[i].name, opts_help[i]);
1679 else
1680 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
1681 long_opts[i].name, opts_help[i]);
1682
1683 puts("\nFor more information, see the scanelf(1) manpage");
1684 exit(status);
1685 }
1686
1687 /* parse command line arguments and preform needed actions */
1688 #define do_pax_state(option, flag) \
1689 if (islower(option)) { \
1690 flags &= ~PF_##flag; \
1691 flags |= PF_NO##flag; \
1692 } else { \
1693 flags &= ~PF_NO##flag; \
1694 flags |= PF_##flag; \
1695 }
1696 static int parseargs(int argc, char *argv[])
1697 {
1698 int i;
1699 const char *from_file = NULL;
1700 int ret = 0;
1701
1702 opterr = 0;
1703 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1704 switch (i) {
1705
1706 case 'V':
1707 printf("pax-utils-%s: %s compiled %s\n%s\n"
1708 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
1709 VERSION, __FILE__, __DATE__, rcsid, argv0);
1710 exit(EXIT_SUCCESS);
1711 break;
1712 case 'h': usage(EXIT_SUCCESS); break;
1713 case 'f':
1714 if (from_file) warn("You prob don't want to specify -f twice");
1715 from_file = optarg;
1716 break;
1717 case 'E':
1718 strncpy(match_etypes, optarg, sizeof(match_etypes));
1719 break;
1720 case 'M':
1721 match_bits = atoi(optarg);
1722 break;
1723 case 'O':
1724 if (sscanf(optarg, "%o", &match_perms) == (-1))
1725 match_bits = 0;
1726 break;
1727 case 'o': {
1728 if (freopen(optarg, "w", stdout) == NULL)
1729 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1730 break;
1731 }
1732 case 'k':
1733 if (find_section) warn("You prob don't want to specify -k twice");
1734 find_section = optarg;
1735 break;
1736 case 's': {
1737 if (find_sym) warn("You prob don't want to specify -s twice");
1738 find_sym = optarg;
1739 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1740 sprintf(versioned_symname, "%s@", find_sym);
1741 break;
1742 }
1743 case 'N': {
1744 if (find_lib) warn("You prob don't want to specify -N twice");
1745 find_lib = optarg;
1746 break;
1747 }
1748
1749 case 'F': {
1750 if (out_format) warn("You prob don't want to specify -F twice");
1751 out_format = optarg;
1752 break;
1753 }
1754 case 'z': {
1755 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1756 size_t x;
1757
1758 for (x = 0 ; x < strlen(optarg); x++) {
1759 switch(optarg[x]) {
1760 case 'p':
1761 case 'P':
1762 do_pax_state(optarg[x], PAGEEXEC);
1763 break;
1764 case 's':
1765 case 'S':
1766 do_pax_state(optarg[x], SEGMEXEC);
1767 break;
1768 case 'm':
1769 case 'M':
1770 do_pax_state(optarg[x], MPROTECT);
1771 break;
1772 case 'e':
1773 case 'E':
1774 do_pax_state(optarg[x], EMUTRAMP);
1775 break;
1776 case 'r':
1777 case 'R':
1778 do_pax_state(optarg[x], RANDMMAP);
1779 break;
1780 case 'x':
1781 case 'X':
1782 do_pax_state(optarg[x], RANDEXEC);
1783 break;
1784 default:
1785 break;
1786 }
1787 }
1788 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
1789 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
1790 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
1791 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
1792 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1793 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1794 setpax = flags;
1795 break;
1796 }
1797 case 'g': g_match = 1; break;
1798 case 'L': use_ldcache = 1; break;
1799 case 'y': scan_symlink = 0; break;
1800 case 'A': scan_archives = 1; break;
1801 case 'B': show_banner = 0; break;
1802 case 'l': scan_ldpath = 1; break;
1803 case 'p': scan_envpath = 1; break;
1804 case 'R': dir_recurse = 1; break;
1805 case 'm': dir_crossmount = 0; break;
1806 case 'X': ++fix_elf; break;
1807 case 'x': show_pax = 1; break;
1808 case 'e': show_phdr = 1; break;
1809 case 't': show_textrel = 1; break;
1810 case 'r': show_rpath = 1; break;
1811 case 'n': show_needed = 1; break;
1812 case 'i': show_interp = 1; break;
1813 case 'b': show_bind = 1; break;
1814 case 'S': show_soname = 1; break;
1815 case 'T': show_textrels = 1; break;
1816 case 'q': be_quiet = 1; break;
1817 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1818 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
1819
1820 case ':':
1821 err("Option '%c' is missing parameter", optopt);
1822 case '?':
1823 err("Unknown option '%c' or argument missing", optopt);
1824 default:
1825 err("Unhandled option '%c'; please report this", i);
1826 }
1827 }
1828 if (show_textrels && be_verbose) {
1829 if (which("objdump") != NULL)
1830 has_objdump = 1;
1831 }
1832 /* let the format option override all other options */
1833 if (out_format) {
1834 show_pax = show_phdr = show_textrel = show_rpath = \
1835 show_needed = show_interp = show_bind = show_soname = \
1836 show_textrels = show_perms = 0;
1837 for (i = 0; out_format[i]; ++i) {
1838 if (!IS_MODIFIER(out_format[i])) continue;
1839
1840 switch (out_format[++i]) {
1841 case '+': break;
1842 case '%': break;
1843 case '#': break;
1844 case 'F': break;
1845 case 'p': break;
1846 case 'f': break;
1847 case 'k': break;
1848 case 's': break;
1849 case 'N': break;
1850 case 'o': break;
1851 case 'a': break;
1852 case 'M': break;
1853 case 'O': show_perms = 1; break;
1854 case 'x': show_pax = 1; break;
1855 case 'e': show_phdr = 1; break;
1856 case 't': show_textrel = 1; break;
1857 case 'r': show_rpath = 1; break;
1858 case 'n': show_needed = 1; break;
1859 case 'i': show_interp = 1; break;
1860 case 'b': show_bind = 1; break;
1861 case 'S': show_soname = 1; break;
1862 case 'T': show_textrels = 1; break;
1863 default:
1864 err("Invalid format specifier '%c' (byte %i)",
1865 out_format[i], i+1);
1866 }
1867 }
1868
1869 /* construct our default format */
1870 } else {
1871 size_t fmt_len = 30;
1872 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
1873 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1874 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1875 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
1876 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1877 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1878 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1879 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1880 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1881 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1882 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1883 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1884 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1885 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1886 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1887 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1888 }
1889 if (be_verbose > 2) printf("Format: %s\n", out_format);
1890
1891 /* now lets actually do the scanning */
1892 if (scan_ldpath || use_ldcache)
1893 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
1894 if (scan_ldpath) scanelf_ldpath();
1895 if (scan_envpath) scanelf_envpath();
1896 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
1897 from_file = "-";
1898 if (from_file) {
1899 scanelf_from_file(from_file);
1900 from_file = *argv;
1901 }
1902 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1903 err("Nothing to scan !?");
1904 while (optind < argc) {
1905 search_path = argv[optind++];
1906 ret = scanelf_dir(search_path);
1907 }
1908
1909 /* clean up */
1910 free(versioned_symname);
1911 for (i = 0; ldpaths[i]; ++i)
1912 free(ldpaths[i]);
1913
1914 if (ldcache != 0)
1915 munmap(ldcache, ldcache_size);
1916 return ret;
1917 }
1918
1919 static char **get_split_env(const char *envvar)
1920 {
1921 const char *delims = " \t\n";
1922 char **envvals = NULL;
1923 char *env, *s;
1924 int nentry;
1925
1926 if ((env = getenv(envvar)) == NULL)
1927 return NULL;
1928
1929 env = xstrdup(env);
1930 if (env == NULL)
1931 return NULL;
1932
1933 s = strtok(env, delims);
1934 if (s == NULL) {
1935 free(env);
1936 return NULL;
1937 }
1938
1939 nentry = 0;
1940 while (s != NULL) {
1941 ++nentry;
1942 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
1943 envvals[nentry-1] = s;
1944 s = strtok(NULL, delims);
1945 }
1946 envvals[nentry] = NULL;
1947
1948 /* don't want to free(env) as it contains the memory that backs
1949 * the envvals array of strings */
1950 return envvals;
1951 }
1952 static void parseenv()
1953 {
1954 qa_textrels = get_split_env("QA_TEXTRELS");
1955 qa_execstack = get_split_env("QA_EXECSTACK");
1956 qa_wx_load = get_split_env("QA_WX_LOAD");
1957 }
1958
1959 #ifdef __PAX_UTILS_CLEANUP
1960 static void cleanup()
1961 {
1962 free(out_format);
1963 free(qa_textrels);
1964 free(qa_execstack);
1965 free(qa_wx_load);
1966 }
1967 #endif
1968
1969
1970 int main(int argc, char *argv[])
1971 {
1972 int ret;
1973 if (argc < 2)
1974 usage(EXIT_FAILURE);
1975 parseenv();
1976 ret = parseargs(argc, argv);
1977 fclose(stdout);
1978 #ifdef __PAX_UTILS_CLEANUP
1979 cleanup();
1980 warn("The calls to add/delete heap should be off:\n"
1981 "\t- 1 due to the out_buffer not being freed in scanelf_file()\n"
1982 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
1983 #endif
1984 return ret;
1985 }
1986
1987
1988
1989 /* utility funcs */
1990 static char *xstrdup(const char *s)
1991 {
1992 char *ret = strdup(s);
1993 if (!ret) err("Could not strdup(): %s", strerror(errno));
1994 return ret;
1995 }
1996 static void *xmalloc(size_t size)
1997 {
1998 void *ret = malloc(size);
1999 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
2000 return ret;
2001 }
2002 static void *xrealloc(void *ptr, size_t size)
2003 {
2004 void *ret = realloc(ptr, size);
2005 if (!ret) err("Could not realloc() %li bytes", (unsigned long)size);
2006 return ret;
2007 }
2008 static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
2009 {
2010 size_t new_len;
2011
2012 new_len = strlen(*dst) + strlen(src);
2013 if (*curr_len <= new_len) {
2014 *curr_len = new_len + (*curr_len / 2);
2015 *dst = realloc(*dst, *curr_len);
2016 if (!*dst)
2017 err("could not realloc() %li bytes", (unsigned long)*curr_len);
2018 }
2019
2020 if (n)
2021 strncat(*dst, src, n);
2022 else
2023 strcat(*dst, src);
2024 }
2025 static inline void xchrcat(char **dst, const char append, size_t *curr_len)
2026 {
2027 static char my_app[2];
2028 my_app[0] = append;
2029 my_app[1] = '\0';
2030 xstrcat(dst, my_app, curr_len);
2031 }
2032
2033 /* Match filename against entries in matchlist, return TRUE
2034 * if the file is listed */
2035 static int file_matches_list(const char *filename, char **matchlist)
2036 {
2037 char **file;
2038 char *match;
2039 char buf[__PAX_UTILS_PATH_MAX];
2040
2041 if (matchlist == NULL)
2042 return 0;
2043
2044 for (file = matchlist; *file != NULL; file++) {
2045 if (search_path) {
2046 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2047 match = buf;
2048 } else {
2049 match = *file;
2050 }
2051 if (fnmatch(match, filename, 0) == 0)
2052 return 1;
2053 }
2054 return 0;
2055 }

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