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Revision 1.209 - (show annotations) (download) (as text)
Sun Mar 15 08:53:29 2009 UTC (5 years, 4 months ago) by vapier
Branch: MAIN
Changes since 1.208: +4 -3 lines
File MIME type: text/x-csrc
store return value of system() since gcc whines about it now, but dont actually use it since we dont care

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 1.208 2009/01/31 17:58:37 grobian Exp $
5 *
6 * Copyright 2003-2007 Ned Ludd - <solar@gentoo.org>
7 * Copyright 2004-2007 Mike Frysinger - <vapier@gentoo.org>
8 */
9
10 static const char *rcsid = "$Id: scanelf.c,v 1.208 2009/01/31 17:58:37 grobian Exp $";
11 const char * const argv0 = "scanelf";
12
13 #include "paxinc.h"
14
15 #define IS_MODIFIER(c) (c == '%' || c == '#' || c == '+')
16
17 /* prototypes */
18 static int file_matches_list(const char *filename, char **matchlist);
19 static int scanelf_elfobj(elfobj *elf);
20 static int scanelf_elf(const char *filename, int fd, size_t len);
21 static int scanelf_archive(const char *filename, int fd, size_t len);
22 static int scanelf_file(const char *filename, const struct stat *st_cache);
23 static int scanelf_dir(const char *path);
24 static void scanelf_ldpath(void);
25 static void scanelf_envpath(void);
26 static void usage(int status);
27 static char **get_split_env(const char *envvar);
28 static void parseenv(void);
29 static int parseargs(int argc, char *argv[]);
30 static int rematch(const char *regex, const char *match, int cflags);
31
32 /* variables to control behavior */
33 static char match_etypes[126] = "";
34 static char *ldpaths[256];
35 static char scan_ldpath = 0;
36 static char scan_envpath = 0;
37 static char scan_symlink = 1;
38 static char scan_archives = 0;
39 static char dir_recurse = 0;
40 static char dir_crossmount = 1;
41 static char show_pax = 0;
42 static char show_perms = 0;
43 static char show_size = 0;
44 static char show_phdr = 0;
45 static char show_textrel = 0;
46 static char show_rpath = 0;
47 static char show_needed = 0;
48 static char show_interp = 0;
49 static char show_bind = 0;
50 static char show_soname = 0;
51 static char show_textrels = 0;
52 static char show_banner = 1;
53 static char show_endian = 0;
54 static char show_osabi = 0;
55 static char show_eabi = 0;
56 static char be_quiet = 0;
57 static char be_verbose = 0;
58 static char be_wewy_wewy_quiet = 0;
59 static char be_semi_verbose = 0;
60 static char *find_sym = NULL;
61 static char *find_lib = NULL;
62 static char *find_section = NULL;
63 static char *out_format = NULL;
64 static char *search_path = NULL;
65 static char fix_elf = 0;
66 static char g_match = 0;
67 static char use_ldcache = 0;
68
69 static char **qa_textrels = NULL;
70 static char **qa_execstack = NULL;
71 static char **qa_wx_load = NULL;
72
73 static int match_bits = 0;
74 static unsigned int match_perms = 0;
75 static caddr_t ldcache = 0;
76 static size_t ldcache_size = 0;
77 static unsigned long setpax = 0UL;
78
79 static int has_objdump = 0;
80
81 /* find the path to a file by name */
82 static char *which(const char *fname)
83 {
84 static char fullpath[__PAX_UTILS_PATH_MAX];
85 char *path, *p;
86
87 path = getenv("PATH");
88 if (!path)
89 return NULL;
90
91 path = xstrdup(path);
92 while ((p = strrchr(path, ':')) != NULL) {
93 snprintf(fullpath, sizeof(fullpath), "%s/%s", p + 1, fname);
94 *p = 0;
95 if (access(fullpath, R_OK) != -1) {
96 free(path);
97 return fullpath;
98 }
99 }
100 free(path);
101 return NULL;
102 }
103
104 /* 1 on failure. 0 otherwise */
105 static int rematch(const char *regex, const char *match, int cflags)
106 {
107 regex_t preg;
108 int ret;
109
110 if ((match == NULL) || (regex == NULL))
111 return EXIT_FAILURE;
112
113 if ((ret = regcomp(&preg, regex, cflags))) {
114 char err[256];
115
116 if (regerror(ret, &preg, err, sizeof(err)))
117 fprintf(stderr, "regcomp failed: %s", err);
118 else
119 fprintf(stderr, "regcomp failed");
120
121 return EXIT_FAILURE;
122 }
123 ret = regexec(&preg, match, 0, NULL, 0);
124 regfree(&preg);
125
126 return ret;
127 }
128
129 /* sub-funcs for scanelf_file() */
130 static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
131 {
132 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
133 #define GET_SYMTABS(B) \
134 if (elf->elf_class == ELFCLASS ## B) { \
135 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
136 /* debug sections */ \
137 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
138 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
139 /* runtime sections */ \
140 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
141 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
142 if (symtab && dynsym) { \
143 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \
144 } else { \
145 *sym = (void*)(symtab ? symtab : dynsym); \
146 } \
147 if (strtab && dynstr) { \
148 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \
149 } else { \
150 *tab = (void*)(strtab ? strtab : dynstr); \
151 } \
152 }
153 GET_SYMTABS(32)
154 GET_SYMTABS(64)
155 }
156
157 static char *scanelf_file_pax(elfobj *elf, char *found_pax)
158 {
159 static char ret[7];
160 unsigned long i, shown;
161
162 if (!show_pax) return NULL;
163
164 shown = 0;
165 memset(&ret, 0, sizeof(ret));
166
167 if (elf->phdr) {
168 #define SHOW_PAX(B) \
169 if (elf->elf_class == ELFCLASS ## B) { \
170 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
171 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
172 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
173 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
174 continue; \
175 if (fix_elf && setpax) { \
176 /* set the paxctl flags */ \
177 ESET(phdr[i].p_flags, setpax); \
178 } \
179 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
180 continue; \
181 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
182 *found_pax = 1; \
183 ++shown; \
184 break; \
185 } \
186 }
187 SHOW_PAX(32)
188 SHOW_PAX(64)
189 }
190
191 if (fix_elf && setpax) {
192 /* set the chpax settings */
193 if (elf->elf_class == ELFCLASS32) {
194 if (EHDR32(elf->ehdr)->e_type == ET_DYN || EHDR32(elf->ehdr)->e_type == ET_EXEC)
195 ESET(EHDR32(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
196 } else {
197 if (EHDR64(elf->ehdr)->e_type == ET_DYN || EHDR64(elf->ehdr)->e_type == ET_EXEC)
198 ESET(EHDR64(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
199 }
200 }
201
202 /* fall back to EI_PAX if no PT_PAX was found */
203 if (!*ret) {
204 static char *paxflags;
205 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
206 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
207 *found_pax = 1;
208 return (be_wewy_wewy_quiet ? NULL : paxflags);
209 }
210 strncpy(ret, paxflags, sizeof(ret));
211 }
212
213 if (be_wewy_wewy_quiet || (be_quiet && !shown))
214 return NULL;
215 else
216 return ret;
217 }
218
219 static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
220 {
221 static char ret[12];
222 char *found;
223 unsigned long i, shown, multi_stack, multi_relro, multi_load;
224 int max_pt_load;
225
226 if (!show_phdr) return NULL;
227
228 memcpy(ret, "--- --- ---\0", 12);
229
230 shown = 0;
231 multi_stack = multi_relro = multi_load = 0;
232 max_pt_load = elf_max_pt_load(elf);
233
234 #define NOTE_GNU_STACK ".note.GNU-stack"
235 #define SHOW_PHDR(B) \
236 if (elf->elf_class == ELFCLASS ## B) { \
237 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
238 Elf ## B ## _Off offset; \
239 uint32_t flags, check_flags; \
240 if (elf->phdr != NULL) { \
241 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
242 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
243 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
244 if (multi_stack++) \
245 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
246 if (file_matches_list(elf->filename, qa_execstack)) \
247 continue; \
248 found = found_phdr; \
249 offset = 0; \
250 check_flags = PF_X; \
251 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
252 if (multi_relro++) \
253 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
254 found = found_relro; \
255 offset = 4; \
256 check_flags = PF_X; \
257 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
258 if (EGET(ehdr->e_type) == ET_DYN || EGET(ehdr->e_type) == ET_EXEC) \
259 if (multi_load++ > max_pt_load) \
260 warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
261 if (file_matches_list(elf->filename, qa_wx_load)) \
262 continue; \
263 found = found_load; \
264 offset = 8; \
265 check_flags = PF_W|PF_X; \
266 } else \
267 continue; \
268 flags = EGET(phdr[i].p_flags); \
269 if (be_quiet && ((flags & check_flags) != check_flags)) \
270 continue; \
271 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
272 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
273 ret[3] = ret[7] = '!'; \
274 flags = EGET(phdr[i].p_flags); \
275 } \
276 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
277 *found = 1; \
278 ++shown; \
279 } \
280 } else if (elf->shdr != NULL) { \
281 /* no program headers which means this is prob an object file */ \
282 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
283 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
284 char *str; \
285 if ((void*)strtbl > (void*)elf->data_end) \
286 goto skip_this_shdr##B; \
287 check_flags = SHF_WRITE|SHF_EXECINSTR; \
288 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
289 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
290 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
291 str = elf->data + offset; \
292 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
293 if (!strcmp(str, NOTE_GNU_STACK)) { \
294 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
295 flags = EGET(shdr[i].sh_flags); \
296 if (be_quiet && ((flags & check_flags) != check_flags)) \
297 continue; \
298 ++*found_phdr; \
299 shown = 1; \
300 if (flags & SHF_WRITE) ret[0] = 'W'; \
301 if (flags & SHF_ALLOC) ret[1] = 'A'; \
302 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
303 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
304 break; \
305 } \
306 } \
307 skip_this_shdr##B: \
308 if (!multi_stack) { \
309 if (file_matches_list(elf->filename, qa_execstack)) \
310 return NULL; \
311 *found_phdr = 1; \
312 shown = 1; \
313 memcpy(ret, "!WX", 3); \
314 } \
315 } \
316 }
317 SHOW_PHDR(32)
318 SHOW_PHDR(64)
319
320 if (be_wewy_wewy_quiet || (be_quiet && !shown))
321 return NULL;
322 else
323 return ret;
324 }
325
326 /*
327 * See if this ELF contains a DT_TEXTREL tag in any of its
328 * PT_DYNAMIC sections.
329 */
330 static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
331 {
332 static const char *ret = "TEXTREL";
333 unsigned long i;
334
335 if (!show_textrel && !show_textrels) return NULL;
336
337 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
338
339 if (elf->phdr) {
340 #define SHOW_TEXTREL(B) \
341 if (elf->elf_class == ELFCLASS ## B) { \
342 Elf ## B ## _Dyn *dyn; \
343 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
344 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
345 Elf ## B ## _Off offset; \
346 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
347 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
348 offset = EGET(phdr[i].p_offset); \
349 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
350 dyn = DYN ## B (elf->data + offset); \
351 while (EGET(dyn->d_tag) != DT_NULL) { \
352 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
353 *found_textrel = 1; \
354 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
355 return (be_wewy_wewy_quiet ? NULL : ret); \
356 } \
357 ++dyn; \
358 } \
359 } }
360 SHOW_TEXTREL(32)
361 SHOW_TEXTREL(64)
362 }
363
364 if (be_quiet || be_wewy_wewy_quiet)
365 return NULL;
366 else
367 return " - ";
368 }
369
370 /*
371 * Scan the .text section to see if there are any relocations in it.
372 * Should rewrite this to check PT_LOAD sections that are marked
373 * Executable rather than the section named '.text'.
374 */
375 static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
376 {
377 unsigned long s, r, rmax;
378 void *symtab_void, *strtab_void, *text_void;
379
380 if (!show_textrels) return NULL;
381
382 /* don't search for TEXTREL's if the ELF doesn't have any */
383 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
384 if (!*found_textrel) return NULL;
385
386 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
387 text_void = elf_findsecbyname(elf, ".text");
388
389 if (symtab_void && strtab_void && text_void && elf->shdr) {
390 #define SHOW_TEXTRELS(B) \
391 if (elf->elf_class == ELFCLASS ## B) { \
392 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
393 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
394 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
395 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
396 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
397 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
398 uint ## B ## _t memsz = EGET(text->sh_size); \
399 Elf ## B ## _Rel *rel; \
400 Elf ## B ## _Rela *rela; \
401 /* search the section headers for relocations */ \
402 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
403 uint32_t sh_type = EGET(shdr[s].sh_type); \
404 if (sh_type == SHT_REL) { \
405 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \
406 rela = NULL; \
407 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
408 } else if (sh_type == SHT_RELA) { \
409 rel = NULL; \
410 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \
411 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
412 } else \
413 continue; \
414 /* now see if any of the relocs are in the .text */ \
415 for (r = 0; r < rmax; ++r) { \
416 unsigned long sym_max; \
417 Elf ## B ## _Addr offset_tmp; \
418 Elf ## B ## _Sym *func; \
419 Elf ## B ## _Sym *sym; \
420 Elf ## B ## _Addr r_offset; \
421 uint ## B ## _t r_info; \
422 if (sh_type == SHT_REL) { \
423 r_offset = EGET(rel[r].r_offset); \
424 r_info = EGET(rel[r].r_info); \
425 } else { \
426 r_offset = EGET(rela[r].r_offset); \
427 r_info = EGET(rela[r].r_info); \
428 } \
429 /* make sure this relocation is inside of the .text */ \
430 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
431 if (be_verbose <= 2) continue; \
432 } else \
433 *found_textrels = 1; \
434 /* locate this relocation symbol name */ \
435 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
436 if ((void*)sym > (void*)elf->data_end) { \
437 warn("%s: corrupt ELF symbol", elf->filename); \
438 continue; \
439 } \
440 sym_max = ELF ## B ## _R_SYM(r_info); \
441 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
442 sym += sym_max; \
443 else \
444 sym = NULL; \
445 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
446 /* show the raw details about this reloc */ \
447 printf(" %s: ", elf->base_filename); \
448 if (sym && sym->st_name) \
449 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \
450 else \
451 printf("(memory/data?)"); \
452 printf(" [0x%lX]", (unsigned long)r_offset); \
453 /* now try to find the closest symbol that this rel is probably in */ \
454 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
455 func = NULL; \
456 offset_tmp = 0; \
457 while (sym_max--) { \
458 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
459 func = sym; \
460 offset_tmp = EGET(sym->st_value); \
461 } \
462 ++sym; \
463 } \
464 printf(" in "); \
465 if (func && func->st_name) { \
466 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
467 if (r_offset > EGET(func->st_size)) \
468 printf("(optimized out: previous %s)", func_name); \
469 else \
470 printf("%s", func_name); \
471 } else \
472 printf("(optimized out)"); \
473 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
474 if (be_verbose && has_objdump) { \
475 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
476 char *sysbuf; \
477 size_t syslen; \
478 int sysret; \
479 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"; \
480 syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
481 sysbuf = xmalloc(syslen); \
482 if (end_addr < r_offset) \
483 /* not uncommon when things are optimized out */ \
484 end_addr = r_offset + 0x100; \
485 snprintf(sysbuf, syslen, sysfmt, \
486 (unsigned long)offset_tmp, \
487 (unsigned long)end_addr, \
488 elf->filename, \
489 (unsigned long)r_offset); \
490 fflush(stdout); \
491 sysret = system(sysbuf); \
492 fflush(stdout); \
493 free(sysbuf); \
494 } \
495 } \
496 } }
497 SHOW_TEXTRELS(32)
498 SHOW_TEXTRELS(64)
499 }
500 if (!*found_textrels)
501 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
502
503 return NULL;
504 }
505
506 static void rpath_security_checks(elfobj *, char *, const char *);
507 static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
508 {
509 struct stat st;
510 switch (*item) {
511 case '/': break;
512 case '.':
513 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
514 break;
515 case ':':
516 case '\0':
517 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
518 break;
519 case '$':
520 if (fstat(elf->fd, &st) != -1)
521 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
522 warnf("Security problem with %s='%s' in %s with mode set of %o",
523 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
524 break;
525 default:
526 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
527 break;
528 }
529 }
530 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
531 {
532 unsigned long i, s;
533 char *rpath, *runpath, **r;
534 void *strtbl_void;
535
536 if (!show_rpath) return;
537
538 strtbl_void = elf_findsecbyname(elf, ".dynstr");
539 rpath = runpath = NULL;
540
541 if (elf->phdr && strtbl_void) {
542 #define SHOW_RPATH(B) \
543 if (elf->elf_class == ELFCLASS ## B) { \
544 Elf ## B ## _Dyn *dyn; \
545 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
546 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
547 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
548 Elf ## B ## _Off offset; \
549 Elf ## B ## _Xword word; \
550 /* Scan all the program headers */ \
551 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
552 /* Just scan dynamic headers */ \
553 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
554 offset = EGET(phdr[i].p_offset); \
555 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
556 /* Just scan dynamic RPATH/RUNPATH headers */ \
557 dyn = DYN ## B (elf->data + offset); \
558 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
559 if (word == DT_RPATH) { \
560 r = &rpath; \
561 } else if (word == DT_RUNPATH) { \
562 r = &runpath; \
563 } else { \
564 ++dyn; \
565 continue; \
566 } \
567 /* Verify the memory is somewhat sane */ \
568 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
569 if (offset < (Elf ## B ## _Off)elf->len) { \
570 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
571 *r = (char*)(elf->data + offset); \
572 /* cache the length in case we need to nuke this section later on */ \
573 if (fix_elf) \
574 offset = strlen(*r); \
575 /* If quiet, don't output paths in ld.so.conf */ \
576 if (be_quiet) { \
577 size_t len; \
578 char *start, *end; \
579 /* note that we only 'chop' off leading known paths. */ \
580 /* since *r is read-only memory, we can only move the ptr forward. */ \
581 start = *r; \
582 /* scan each path in : delimited list */ \
583 while (start) { \
584 rpath_security_checks(elf, start, get_elfdtype(word)); \
585 end = strchr(start, ':'); \
586 len = (end ? abs(end - start) : strlen(start)); \
587 if (use_ldcache) \
588 for (s = 0; ldpaths[s]; ++s) \
589 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
590 *r = end; \
591 /* corner case ... if RPATH reads "/usr/lib:", we want \
592 * to show ':' rather than '' */ \
593 if (end && end[1] != '\0') \
594 (*r)++; \
595 break; \
596 } \
597 if (!*r || !end) \
598 break; \
599 else \
600 start = start + len + 1; \
601 } \
602 } \
603 if (*r) { \
604 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
605 /* just nuke it */ \
606 nuke_it##B: \
607 memset(*r, 0x00, offset); \
608 *r = NULL; \
609 ESET(dyn->d_tag, DT_DEBUG); \
610 ESET(dyn->d_un.d_ptr, 0); \
611 } else if (fix_elf) { \
612 /* try to clean "bad" paths */ \
613 size_t len, tmpdir_len; \
614 char *start, *end; \
615 const char *tmpdir; \
616 start = *r; \
617 tmpdir = (getenv("TMPDIR") ? : "."); \
618 tmpdir_len = strlen(tmpdir); \
619 while (1) { \
620 end = strchr(start, ':'); \
621 if (start == end) { \
622 eat_this_path##B: \
623 len = strlen(end); \
624 memmove(start, end+1, len); \
625 start[len-1] = '\0'; \
626 end = start - 1; \
627 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
628 if (!end) { \
629 if (start == *r) \
630 goto nuke_it##B; \
631 *--start = '\0'; \
632 } else \
633 goto eat_this_path##B; \
634 } \
635 if (!end) \
636 break; \
637 start = end + 1; \
638 } \
639 if (**r == '\0') \
640 goto nuke_it##B; \
641 } \
642 if (*r) \
643 *found_rpath = 1; \
644 } \
645 } \
646 ++dyn; \
647 } \
648 } }
649 SHOW_RPATH(32)
650 SHOW_RPATH(64)
651 }
652
653 if (be_wewy_wewy_quiet) return;
654
655 if (rpath && runpath) {
656 if (!strcmp(rpath, runpath)) {
657 xstrcat(ret, runpath, ret_len);
658 } else {
659 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
660 xchrcat(ret, '{', ret_len);
661 xstrcat(ret, rpath, ret_len);
662 xchrcat(ret, ',', ret_len);
663 xstrcat(ret, runpath, ret_len);
664 xchrcat(ret, '}', ret_len);
665 }
666 } else if (rpath || runpath)
667 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
668 else if (!be_quiet)
669 xstrcat(ret, " - ", ret_len);
670 }
671
672 #define LDSO_CACHE_MAGIC "ld.so-"
673 #define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
674 #define LDSO_CACHE_VER "1.7.0"
675 #define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
676 #define FLAG_ANY -1
677 #define FLAG_TYPE_MASK 0x00ff
678 #define FLAG_LIBC4 0x0000
679 #define FLAG_ELF 0x0001
680 #define FLAG_ELF_LIBC5 0x0002
681 #define FLAG_ELF_LIBC6 0x0003
682 #define FLAG_REQUIRED_MASK 0xff00
683 #define FLAG_SPARC_LIB64 0x0100
684 #define FLAG_IA64_LIB64 0x0200
685 #define FLAG_X8664_LIB64 0x0300
686 #define FLAG_S390_LIB64 0x0400
687 #define FLAG_POWERPC_LIB64 0x0500
688 #define FLAG_MIPS64_LIBN32 0x0600
689 #define FLAG_MIPS64_LIBN64 0x0700
690
691 static char *lookup_cache_lib(elfobj *, char *);
692
693 #if defined(__GLIBC__) || defined(__UCLIBC__)
694
695 static char *lookup_cache_lib(elfobj *elf, char *fname)
696 {
697 int fd = 0;
698 char *strs;
699 static char buf[__PAX_UTILS_PATH_MAX] = "";
700 const char *cachefile = "/etc/ld.so.cache";
701 struct stat st;
702
703 typedef struct {
704 char magic[LDSO_CACHE_MAGIC_LEN];
705 char version[LDSO_CACHE_VER_LEN];
706 int nlibs;
707 } header_t;
708 header_t *header;
709
710 typedef struct {
711 int flags;
712 int sooffset;
713 int liboffset;
714 } libentry_t;
715 libentry_t *libent;
716
717 if (fname == NULL)
718 return NULL;
719
720 if (ldcache == 0) {
721 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1)
722 return NULL;
723
724 /* cache these values so we only map/unmap the cache file once */
725 ldcache_size = st.st_size;
726 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
727
728 close(fd);
729
730 if (ldcache == MAP_FAILED) {
731 ldcache = 0;
732 return NULL;
733 }
734
735 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
736 return NULL;
737 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
738 return NULL;
739 }
740
741 header = (header_t *) ldcache;
742 libent = (libentry_t *) (ldcache + sizeof(header_t));
743 strs = (char *) &libent[header->nlibs];
744
745 for (fd = 0; fd < header->nlibs; fd++) {
746 /* this should be more fine grained, but for now we assume that
747 * diff arches will not be cached together. and we ignore the
748 * the different multilib mips cases. */
749 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
750 continue;
751 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
752 continue;
753
754 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
755 continue;
756 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
757 }
758 return buf;
759 }
760 #elif defined(__NetBSD__)
761 static char *lookup_cache_lib(elfobj *elf, char *fname)
762 {
763 static char buf[__PAX_UTILS_PATH_MAX] = "";
764 static struct stat st;
765
766 char **ldpath;
767 for (ldpath = ldpaths; *ldpath != NULL; ldpath++) {
768 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", *ldpath, fname) >= sizeof(buf))
769 continue; /* if the pathname is too long, or something went wrong, ignore */
770
771 if (stat(buf, &st) != 0)
772 continue; /* if the lib doesn't exist in *ldpath, look further */
773
774 /* NetBSD doesn't actually do sanity checks, it just loads the file
775 * and if that doesn't work, continues looking in other directories.
776 * This cannot easily be safely emulated, unfortunately. For now,
777 * just assume that if it exists, it's a valid library. */
778
779 return buf;
780 }
781
782 /* not found in any path */
783 return NULL;
784 }
785 #else
786 #ifdef __ELF__
787 #warning Cache support not implemented for your target
788 #endif
789 static char *lookup_cache_lib(elfobj *elf, char *fname)
790 {
791 return NULL;
792 }
793 #endif
794
795 static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
796 {
797 unsigned long i;
798 char *needed;
799 void *strtbl_void;
800 char *p;
801
802 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
803
804 strtbl_void = elf_findsecbyname(elf, ".dynstr");
805
806 if (elf->phdr && strtbl_void) {
807 #define SHOW_NEEDED(B) \
808 if (elf->elf_class == ELFCLASS ## B) { \
809 Elf ## B ## _Dyn *dyn; \
810 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
811 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
812 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
813 Elf ## B ## _Off offset; \
814 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
815 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
816 offset = EGET(phdr[i].p_offset); \
817 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
818 dyn = DYN ## B (elf->data + offset); \
819 while (EGET(dyn->d_tag) != DT_NULL) { \
820 if (EGET(dyn->d_tag) == DT_NEEDED) { \
821 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
822 if (offset >= (Elf ## B ## _Off)elf->len) { \
823 ++dyn; \
824 continue; \
825 } \
826 needed = (char*)(elf->data + offset); \
827 if (op == 0) { \
828 if (!be_wewy_wewy_quiet) { \
829 if (*found_needed) xchrcat(ret, ',', ret_len); \
830 if (use_ldcache) \
831 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
832 needed = p; \
833 xstrcat(ret, needed, ret_len); \
834 } \
835 *found_needed = 1; \
836 } else { \
837 if (!strncmp(find_lib, needed, strlen( !g_match ? needed : find_lib))) { \
838 *found_lib = 1; \
839 return (be_wewy_wewy_quiet ? NULL : needed); \
840 } \
841 } \
842 } \
843 ++dyn; \
844 } \
845 } }
846 SHOW_NEEDED(32)
847 SHOW_NEEDED(64)
848 if (op == 0 && !*found_needed && be_verbose)
849 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
850 }
851
852 return NULL;
853 }
854 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
855 {
856 void *strtbl_void;
857
858 if (!show_interp) return NULL;
859
860 strtbl_void = elf_findsecbyname(elf, ".interp");
861
862 if (strtbl_void) {
863 #define SHOW_INTERP(B) \
864 if (elf->elf_class == ELFCLASS ## B) { \
865 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
866 *found_interp = 1; \
867 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
868 }
869 SHOW_INTERP(32)
870 SHOW_INTERP(64)
871 }
872 return NULL;
873 }
874 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
875 {
876 unsigned long i;
877 struct stat s;
878 char dynamic = 0;
879
880 if (!show_bind) return NULL;
881 if (!elf->phdr) return NULL;
882
883 #define SHOW_BIND(B) \
884 if (elf->elf_class == ELFCLASS ## B) { \
885 Elf ## B ## _Dyn *dyn; \
886 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
887 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
888 Elf ## B ## _Off offset; \
889 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
890 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
891 dynamic = 1; \
892 offset = EGET(phdr[i].p_offset); \
893 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
894 dyn = DYN ## B (elf->data + offset); \
895 while (EGET(dyn->d_tag) != DT_NULL) { \
896 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
897 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
898 { \
899 if (be_quiet) return NULL; \
900 *found_bind = 1; \
901 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
902 } \
903 ++dyn; \
904 } \
905 } \
906 }
907 SHOW_BIND(32)
908 SHOW_BIND(64)
909
910 if (be_wewy_wewy_quiet) return NULL;
911
912 /* don't output anything if quiet mode and the ELF is static or not setuid */
913 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
914 return NULL;
915 } else {
916 *found_bind = 1;
917 return (char *) (dynamic ? "LAZY" : "STATIC");
918 }
919 }
920 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
921 {
922 unsigned long i;
923 char *soname;
924 void *strtbl_void;
925
926 if (!show_soname) return NULL;
927
928 strtbl_void = elf_findsecbyname(elf, ".dynstr");
929
930 if (elf->phdr && strtbl_void) {
931 #define SHOW_SONAME(B) \
932 if (elf->elf_class == ELFCLASS ## B) { \
933 Elf ## B ## _Dyn *dyn; \
934 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
935 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
936 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
937 Elf ## B ## _Off offset; \
938 /* only look for soname in shared objects */ \
939 if (EGET(ehdr->e_type) != ET_DYN) \
940 return NULL; \
941 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
942 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
943 offset = EGET(phdr[i].p_offset); \
944 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
945 dyn = DYN ## B (elf->data + offset); \
946 while (EGET(dyn->d_tag) != DT_NULL) { \
947 if (EGET(dyn->d_tag) == DT_SONAME) { \
948 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
949 if (offset >= (Elf ## B ## _Off)elf->len) { \
950 ++dyn; \
951 continue; \
952 } \
953 soname = (char*)(elf->data + offset); \
954 *found_soname = 1; \
955 return (be_wewy_wewy_quiet ? NULL : soname); \
956 } \
957 ++dyn; \
958 } \
959 } }
960 SHOW_SONAME(32)
961 SHOW_SONAME(64)
962 }
963
964 return NULL;
965 }
966
967 static int scanelf_match_symname(const char *symname, const char *tomatch) {
968 /* We do things differently when checking with regexp */
969 if (g_match) {
970 return rematch(symname, tomatch, REG_EXTENDED) == 0;
971 } else {
972 const size_t symname_len = strlen(symname);
973 return (strncmp(symname, tomatch, symname_len) == 0 &&
974 /* Accept unversioned symbol names */
975 (tomatch[symname_len] == '\0' || tomatch[symname_len] == '@'));
976 }
977 }
978
979 static char *scanelf_file_sym(elfobj *elf, char *found_sym)
980 {
981 unsigned long i;
982 char *ret;
983 void *symtab_void, *strtab_void;
984
985 if (!find_sym) return NULL;
986 ret = find_sym;
987
988 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
989
990 if (symtab_void && strtab_void) {
991 #define FIND_SYM(B) \
992 if (elf->elf_class == ELFCLASS ## B) { \
993 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
994 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
995 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
996 unsigned long cnt = EGET(symtab->sh_entsize); \
997 char *symname; \
998 if (cnt) \
999 cnt = EGET(symtab->sh_size) / cnt; \
1000 for (i = 0; i < cnt; ++i) { \
1001 if ((void*)sym > (void*)elf->data_end) { \
1002 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1003 goto break_out; \
1004 } \
1005 if (sym->st_name) { \
1006 /* make sure the symbol name is in acceptable memory range */ \
1007 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
1008 if ((void*)symname > (void*)elf->data_end) { \
1009 warnf("%s: corrupt ELF symbols", elf->filename); \
1010 ++sym; \
1011 continue; \
1012 } \
1013 /* debug display ... show all symbols and some extra info */ \
1014 if (0 && g_match ? rematch(ret, symname, REG_EXTENDED) == 0 : *ret == '*') { \
1015 printf("%s(%s) %5lX %15s %s %s\n", \
1016 ((*found_sym == 0) ? "\n\t" : "\t"), \
1017 elf->base_filename, \
1018 (unsigned long)sym->st_size, \
1019 get_elfstttype(sym->st_info), \
1020 sym->st_shndx == SHN_UNDEF ? "U" : "D", symname); \
1021 *found_sym = 1; \
1022 } else { \
1023 /* allow the user to specify a comma delimited list of symbols to search for */ \
1024 char *this_sym, *next_sym; \
1025 next_sym = ret; \
1026 while (next_sym) { \
1027 this_sym = next_sym; \
1028 if ((next_sym = strchr(this_sym, ','))) \
1029 next_sym += 1; /* Skip the comma */ \
1030 /* do we want a defined symbol ? */ \
1031 if (*this_sym == '+') { \
1032 if (sym->st_shndx == SHN_UNDEF) \
1033 continue; \
1034 ++this_sym; \
1035 /* do we want an undefined symbol ? */ \
1036 } else if (*this_sym == '-') { \
1037 if (sym->st_shndx != SHN_UNDEF) \
1038 continue; \
1039 ++this_sym; \
1040 } \
1041 if (next_sym) /* Copy it so that we don't have to worry about the final , */ \
1042 this_sym = xstrndup(this_sym, next_sym-this_sym); \
1043 /* ok, lets compare the name now */ \
1044 if (scanelf_match_symname(this_sym, symname)) { \
1045 if (be_semi_verbose) { \
1046 char buf[126]; \
1047 snprintf(buf, sizeof(buf), "%lX %s %s", \
1048 (unsigned long)sym->st_size, get_elfstttype(sym->st_info), this_sym); \
1049 ret = buf; \
1050 } else \
1051 ret = symname; \
1052 (*found_sym)++; \
1053 goto break_out; \
1054 } \
1055 if (next_sym) free(this_sym); \
1056 } \
1057 } \
1058 } \
1059 ++sym; \
1060 } }
1061 FIND_SYM(32)
1062 FIND_SYM(64)
1063 }
1064
1065 break_out:
1066 if (be_wewy_wewy_quiet) return NULL;
1067
1068 if (*find_sym != '*' && *found_sym)
1069 return ret;
1070 if (be_quiet)
1071 return NULL;
1072 else
1073 return (char *)" - ";
1074 }
1075
1076 static char *scanelf_file_sections(elfobj *elf, char *found_section)
1077 {
1078 if (!find_section)
1079 return NULL;
1080
1081 #define FIND_SECTION(B) \
1082 if (elf->elf_class == ELFCLASS ## B) { \
1083 int invert; \
1084 Elf ## B ## _Shdr *section; \
1085 invert = (*find_section == '!' ? 1 : 0); \
1086 section = SHDR ## B (elf_findsecbyname(elf, find_section+invert)); \
1087 if ((section == NULL && invert) || (section != NULL && !invert)) \
1088 *found_section = 1; \
1089 }
1090 FIND_SECTION(32)
1091 FIND_SECTION(64)
1092
1093 if (be_wewy_wewy_quiet)
1094 return NULL;
1095
1096 if (*found_section)
1097 return find_section;
1098
1099 if (be_quiet)
1100 return NULL;
1101 else
1102 return (char *)" - ";
1103 }
1104
1105 /* scan an elf file and show all the fun stuff */
1106 #define prints(str) write(fileno(stdout), str, strlen(str))
1107 static int scanelf_elfobj(elfobj *elf)
1108 {
1109 unsigned long i;
1110 char 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;
1113 static char *out_buffer = NULL;
1114 static size_t out_len;
1115
1116 found_pax = found_phdr = found_relro = found_load = found_textrel = \
1117 found_rpath = found_needed = found_interp = found_bind = found_soname = \
1118 found_sym = found_lib = found_file = found_textrels = found_section = 0;
1119
1120 if (be_verbose > 2)
1121 printf("%s: scanning file {%s,%s}\n", elf->filename,
1122 get_elfeitype(EI_CLASS, elf->elf_class),
1123 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
1124 else if (be_verbose > 1)
1125 printf("%s: scanning file\n", elf->filename);
1126
1127 /* init output buffer */
1128 if (!out_buffer) {
1129 out_len = sizeof(char) * 80;
1130 out_buffer = xmalloc(out_len);
1131 }
1132 *out_buffer = '\0';
1133
1134 /* show the header */
1135 if (!be_quiet && show_banner) {
1136 for (i = 0; out_format[i]; ++i) {
1137 if (!IS_MODIFIER(out_format[i])) continue;
1138
1139 switch (out_format[++i]) {
1140 case '+': break;
1141 case '%': break;
1142 case '#': break;
1143 case 'F':
1144 case 'p':
1145 case 'f': prints("FILE "); found_file = 1; break;
1146 case 'o': prints(" TYPE "); break;
1147 case 'x': prints(" PAX "); break;
1148 case 'e': prints("STK/REL/PTL "); break;
1149 case 't': prints("TEXTREL "); break;
1150 case 'r': prints("RPATH "); break;
1151 case 'M': prints("CLASS "); break;
1152 case 'n': prints("NEEDED "); break;
1153 case 'i': prints("INTERP "); break;
1154 case 'b': prints("BIND "); break;
1155 case 'Z': prints("SIZE "); break;
1156 case 'S': prints("SONAME "); break;
1157 case 's': prints("SYM "); break;
1158 case 'N': prints("LIB "); break;
1159 case 'T': prints("TEXTRELS "); break;
1160 case 'k': prints("SECTION "); break;
1161 case 'a': prints("ARCH "); break;
1162 case 'I': prints("OSABI "); break;
1163 case 'Y': prints("EABI "); break;
1164 case 'O': prints("PERM "); break;
1165 case 'D': prints("ENDIAN "); break;
1166 default: warnf("'%c' has no title ?", out_format[i]);
1167 }
1168 }
1169 if (!found_file) prints("FILE ");
1170 prints("\n");
1171 found_file = 0;
1172 show_banner = 0;
1173 }
1174
1175 /* dump all the good stuff */
1176 for (i = 0; out_format[i]; ++i) {
1177 const char *out;
1178 const char *tmp;
1179 static char ubuf[sizeof(unsigned long)*2];
1180 if (!IS_MODIFIER(out_format[i])) {
1181 xchrcat(&out_buffer, out_format[i], &out_len);
1182 continue;
1183 }
1184
1185 out = NULL;
1186 be_wewy_wewy_quiet = (out_format[i] == '#');
1187 be_semi_verbose = (out_format[i] == '+');
1188 switch (out_format[++i]) {
1189 case '+':
1190 case '%':
1191 case '#':
1192 xchrcat(&out_buffer, out_format[i], &out_len); break;
1193 case 'F':
1194 found_file = 1;
1195 if (be_wewy_wewy_quiet) break;
1196 xstrcat(&out_buffer, elf->filename, &out_len);
1197 break;
1198 case 'p':
1199 found_file = 1;
1200 if (be_wewy_wewy_quiet) break;
1201 tmp = elf->filename;
1202 if (search_path) {
1203 ssize_t len_search = strlen(search_path);
1204 ssize_t len_file = strlen(elf->filename);
1205 if (!strncmp(elf->filename, search_path, len_search) && \
1206 len_file > len_search)
1207 tmp += len_search;
1208 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1209 }
1210 xstrcat(&out_buffer, tmp, &out_len);
1211 break;
1212 case 'f':
1213 found_file = 1;
1214 if (be_wewy_wewy_quiet) break;
1215 tmp = strrchr(elf->filename, '/');
1216 tmp = (tmp == NULL ? elf->filename : tmp+1);
1217 xstrcat(&out_buffer, tmp, &out_len);
1218 break;
1219 case 'o': out = get_elfetype(elf); break;
1220 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
1221 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
1222 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1223 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
1224 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1225 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1226 case 'D': out = get_endian(elf); break;
1227 case 'O': out = strfileperms(elf->filename); break;
1228 case 'n':
1229 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
1230 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1231 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1232 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
1233 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1234 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1235 case 'a': out = get_elfemtype(elf); break;
1236 case 'I': out = get_elfosabi(elf); break;
1237 case 'Y': out = get_elf_eabi(elf); break;
1238 case 'Z': snprintf(ubuf, sizeof(ubuf), "%lu", (unsigned long)elf->len); out = ubuf; break;;
1239 default: warnf("'%c' has no scan code?", out_format[i]);
1240 }
1241 if (out) {
1242 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
1243 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
1244 xstrncat(&out_buffer, out, &out_len, (tmp-out));
1245 else
1246 xstrcat(&out_buffer, out, &out_len);
1247 }
1248 }
1249
1250 #define FOUND_SOMETHING() \
1251 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1252 found_rpath || found_needed || found_interp || found_bind || \
1253 found_soname || found_sym || found_lib || found_textrels || found_section )
1254
1255 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1256 xchrcat(&out_buffer, ' ', &out_len);
1257 xstrcat(&out_buffer, elf->filename, &out_len);
1258 }
1259 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
1260 puts(out_buffer);
1261 fflush(stdout);
1262 }
1263
1264 return 0;
1265 }
1266
1267 /* scan a single elf */
1268 static int scanelf_elf(const char *filename, int fd, size_t len)
1269 {
1270 int ret = 1;
1271 elfobj *elf;
1272
1273 /* verify this is real ELF */
1274 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1275 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1276 return ret;
1277 }
1278 switch (match_bits) {
1279 case 32:
1280 if (elf->elf_class != ELFCLASS32)
1281 goto label_done;
1282 break;
1283 case 64:
1284 if (elf->elf_class != ELFCLASS64)
1285 goto label_done;
1286 break;
1287 default: break;
1288 }
1289 if (strlen(match_etypes)) {
1290 char sbuf[126];
1291 strncpy(sbuf, match_etypes, sizeof(sbuf));
1292 if (strchr(match_etypes, ',') != NULL) {
1293 char *p;
1294 while ((p = strrchr(sbuf, ',')) != NULL) {
1295 *p = 0;
1296 if (etype_lookup(p+1) == get_etype(elf))
1297 goto label_ret;
1298 }
1299 }
1300 if (etype_lookup(sbuf) != get_etype(elf))
1301 goto label_done;
1302 }
1303
1304 label_ret:
1305 ret = scanelf_elfobj(elf);
1306
1307 label_done:
1308 unreadelf(elf);
1309 return ret;
1310 }
1311
1312 /* scan an archive of elfs */
1313 static int scanelf_archive(const char *filename, int fd, size_t len)
1314 {
1315 archive_handle *ar;
1316 archive_member *m;
1317 char *ar_buffer;
1318 elfobj *elf;
1319
1320 ar = ar_open_fd(filename, fd);
1321 if (ar == NULL)
1322 return 1;
1323
1324 ar_buffer = mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1325 while ((m=ar_next(ar)) != NULL) {
1326 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size);
1327 if (elf) {
1328 scanelf_elfobj(elf);
1329 unreadelf(elf);
1330 }
1331 }
1332 munmap(ar_buffer, len);
1333
1334 return 0;
1335 }
1336 /* scan a file which may be an elf or an archive or some other magical beast */
1337 static int scanelf_file(const char *filename, const struct stat *st_cache)
1338 {
1339 const struct stat *st = st_cache;
1340 struct stat symlink_st;
1341 int fd;
1342
1343 /* always handle regular files and handle symlinked files if no -y */
1344 if (S_ISLNK(st->st_mode)) {
1345 if (!scan_symlink) return 1;
1346 stat(filename, &symlink_st);
1347 st = &symlink_st;
1348 }
1349
1350 if (!S_ISREG(st->st_mode)) {
1351 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1352 return 1;
1353 }
1354
1355 if (match_perms) {
1356 if ((st->st_mode | match_perms) != st->st_mode)
1357 return 1;
1358 }
1359 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1360 return 1;
1361
1362 if (scanelf_elf(filename, fd, st->st_size) == 1 && scan_archives)
1363 /* if it isn't an ELF, maybe it's an .a archive */
1364 scanelf_archive(filename, fd, st->st_size);
1365
1366 close(fd);
1367 return 0;
1368 }
1369
1370 /* scan a directory for ET_EXEC files and print when we find one */
1371 static int scanelf_dir(const char *path)
1372 {
1373 register DIR *dir;
1374 register struct dirent *dentry;
1375 struct stat st_top, st;
1376 char buf[__PAX_UTILS_PATH_MAX];
1377 size_t pathlen = 0, len = 0;
1378 int ret = 0;
1379
1380 /* make sure path exists */
1381 if (lstat(path, &st_top) == -1) {
1382 if (be_verbose > 2) printf("%s: does not exist\n", path);
1383 return 1;
1384 }
1385
1386 /* ok, if it isn't a directory, assume we can open it */
1387 if (!S_ISDIR(st_top.st_mode)) {
1388 return scanelf_file(path, &st_top);
1389 }
1390
1391 /* now scan the dir looking for fun stuff */
1392 if ((dir = opendir(path)) == NULL) {
1393 warnf("could not opendir %s: %s", path, strerror(errno));
1394 return 1;
1395 }
1396 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1397
1398 pathlen = strlen(path);
1399 while ((dentry = readdir(dir))) {
1400 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1401 continue;
1402 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
1403 if (len >= sizeof(buf)) {
1404 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1405 (unsigned long)len, (unsigned long)sizeof(buf));
1406 continue;
1407 }
1408 snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name);
1409 if (lstat(buf, &st) != -1) {
1410 if (S_ISREG(st.st_mode))
1411 ret = scanelf_file(buf, &st);
1412 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1413 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1414 ret = scanelf_dir(buf);
1415 }
1416 }
1417 }
1418 closedir(dir);
1419 return ret;
1420 }
1421
1422 static int scanelf_from_file(const char *filename)
1423 {
1424 FILE *fp = NULL;
1425 char *p;
1426 char path[__PAX_UTILS_PATH_MAX];
1427 int ret = 0;
1428
1429 if (strcmp(filename, "-") == 0)
1430 fp = stdin;
1431 else if ((fp = fopen(filename, "r")) == NULL)
1432 return 1;
1433
1434 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1435 if ((p = strchr(path, '\n')) != NULL)
1436 *p = 0;
1437 search_path = path;
1438 ret = scanelf_dir(path);
1439 }
1440 if (fp != stdin)
1441 fclose(fp);
1442 return ret;
1443 }
1444
1445 #if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1446
1447 static int load_ld_cache_config(int i, const char *fname)
1448 {
1449 FILE *fp = NULL;
1450 char *p;
1451 char path[__PAX_UTILS_PATH_MAX];
1452
1453 if (i + 1 == ARRAY_SIZE(ldpaths))
1454 return i;
1455
1456 if ((fp = fopen(fname, "r")) == NULL)
1457 return i;
1458
1459 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1460 if ((p = strrchr(path, '\r')) != NULL)
1461 *p = 0;
1462 if ((p = strchr(path, '\n')) != NULL)
1463 *p = 0;
1464 #ifdef __linux__
1465 /* recursive includes of the same file will make this segfault. */
1466 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1467 glob64_t gl;
1468 size_t x;
1469 char gpath[__PAX_UTILS_PATH_MAX];
1470
1471 memset(gpath, 0, sizeof(gpath));
1472
1473 if (path[8] != '/')
1474 snprintf(gpath, sizeof(gpath), "/etc/%s", &path[8]);
1475 else
1476 strncpy(gpath, &path[8], sizeof(gpath));
1477
1478 if ((glob64(gpath, 0, NULL, &gl)) == 0) {
1479 for (x = 0; x < gl.gl_pathc; ++x) {
1480 /* try to avoid direct loops */
1481 if (strcmp(gl.gl_pathv[x], fname) == 0)
1482 continue;
1483 i = load_ld_cache_config(i, gl.gl_pathv[x]);
1484 if (i + 1 >= ARRAY_SIZE(ldpaths)) {
1485 globfree64(&gl);
1486 return i;
1487 }
1488 }
1489 globfree64 (&gl);
1490 continue;
1491 }
1492 }
1493 #endif
1494 if (*path != '/')
1495 continue;
1496
1497 ldpaths[i++] = xstrdup(path);
1498
1499 if (i + 1 == ARRAY_SIZE(ldpaths))
1500 break;
1501 }
1502 ldpaths[i] = NULL;
1503
1504 fclose(fp);
1505 return i;
1506 }
1507
1508 #elif defined(__FreeBSD__) || (__DragonFly__)
1509
1510 static int load_ld_cache_config(int i, const char *fname)
1511 {
1512 FILE *fp = NULL;
1513 char *b = NULL, *p;
1514 struct elfhints_hdr hdr;
1515
1516 if (i + 1 == ARRAY_SIZE(ldpaths))
1517 return i;
1518
1519 if ((fp = fopen(fname, "r")) == NULL)
1520 return i;
1521
1522 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1523 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1524 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1525 {
1526 fclose(fp);
1527 return i;
1528 }
1529
1530 b = xmalloc(hdr.dirlistlen + 1);
1531 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1532 fclose(fp);
1533 free(b);
1534 return i;
1535 }
1536
1537 while ((p = strsep(&b, ":"))) {
1538 if (*p == '\0') continue;
1539 ldpaths[i++] = xstrdup(p);
1540
1541 if (i + 1 == ARRAY_SIZE(ldpaths))
1542 break;
1543 }
1544 ldpaths[i] = NULL;
1545
1546 free(b);
1547 fclose(fp);
1548 return i;
1549 }
1550
1551 #else
1552 #ifdef __ELF__
1553 #warning Cache config support not implemented for your target
1554 #endif
1555 static int load_ld_cache_config(int i, const char *fname)
1556 {
1557 memset(ldpaths, 0x00, sizeof(ldpaths));
1558 return 0;
1559 }
1560 #endif
1561
1562 /* scan /etc/ld.so.conf for paths */
1563 static void scanelf_ldpath(void)
1564 {
1565 char scan_l, scan_ul, scan_ull;
1566 int i = 0;
1567
1568 if (!ldpaths[0])
1569 err("Unable to load any paths from ld.so.conf");
1570
1571 scan_l = scan_ul = scan_ull = 0;
1572
1573 while (ldpaths[i]) {
1574 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
1575 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
1576 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
1577 scanelf_dir(ldpaths[i]);
1578 ++i;
1579 }
1580
1581 if (!scan_l) scanelf_dir("/lib");
1582 if (!scan_ul) scanelf_dir("/usr/lib");
1583 if (!scan_ull) scanelf_dir("/usr/local/lib");
1584 }
1585
1586 /* scan env PATH for paths */
1587 static void scanelf_envpath(void)
1588 {
1589 char *path, *p;
1590
1591 path = getenv("PATH");
1592 if (!path)
1593 err("PATH is not set in your env !");
1594 path = xstrdup(path);
1595
1596 while ((p = strrchr(path, ':')) != NULL) {
1597 scanelf_dir(p + 1);
1598 *p = 0;
1599 }
1600
1601 free(path);
1602 }
1603
1604 /* usage / invocation handling functions */ /* Free Flags: c d j u w C G H J K P Q U W */
1605 #define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZBhV"
1606 #define a_argument required_argument
1607 static struct option const long_opts[] = {
1608 {"path", no_argument, NULL, 'p'},
1609 {"ldpath", no_argument, NULL, 'l'},
1610 {"recursive", no_argument, NULL, 'R'},
1611 {"mount", no_argument, NULL, 'm'},
1612 {"symlink", no_argument, NULL, 'y'},
1613 {"archives", no_argument, NULL, 'A'},
1614 {"ldcache", no_argument, NULL, 'L'},
1615 {"fix", no_argument, NULL, 'X'},
1616 {"setpax", a_argument, NULL, 'z'},
1617 {"pax", no_argument, NULL, 'x'},
1618 {"header", no_argument, NULL, 'e'},
1619 {"textrel", no_argument, NULL, 't'},
1620 {"rpath", no_argument, NULL, 'r'},
1621 {"needed", no_argument, NULL, 'n'},
1622 {"interp", no_argument, NULL, 'i'},
1623 {"bind", no_argument, NULL, 'b'},
1624 {"soname", no_argument, NULL, 'S'},
1625 {"symbol", a_argument, NULL, 's'},
1626 {"section", a_argument, NULL, 'k'},
1627 {"lib", a_argument, NULL, 'N'},
1628 {"gmatch", no_argument, NULL, 'g'},
1629 {"textrels", no_argument, NULL, 'T'},
1630 {"etype", a_argument, NULL, 'E'},
1631 {"bits", a_argument, NULL, 'M'},
1632 {"endian", no_argument, NULL, 'D'},
1633 {"osabi", no_argument, NULL, 'I'},
1634 {"eabi", no_argument, NULL, 'Y'},
1635 {"perms", a_argument, NULL, 'O'},
1636 {"size", no_argument, NULL, 'Z'},
1637 {"all", no_argument, NULL, 'a'},
1638 {"quiet", no_argument, NULL, 'q'},
1639 {"verbose", no_argument, NULL, 'v'},
1640 {"format", a_argument, NULL, 'F'},
1641 {"from", a_argument, NULL, 'f'},
1642 {"file", a_argument, NULL, 'o'},
1643 {"nobanner", no_argument, NULL, 'B'},
1644 {"help", no_argument, NULL, 'h'},
1645 {"version", no_argument, NULL, 'V'},
1646 {NULL, no_argument, NULL, 0x0}
1647 };
1648
1649 static const char *opts_help[] = {
1650 "Scan all directories in PATH environment",
1651 "Scan all directories in /etc/ld.so.conf",
1652 "Scan directories recursively",
1653 "Don't recursively cross mount points",
1654 "Don't scan symlinks",
1655 "Scan archives (.a files)",
1656 "Utilize ld.so.cache information (use with -r/-n)",
1657 "Try and 'fix' bad things (use with -r/-e)",
1658 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1659 "Print PaX markings",
1660 "Print GNU_STACK/PT_LOAD markings",
1661 "Print TEXTREL information",
1662 "Print RPATH information",
1663 "Print NEEDED information",
1664 "Print INTERP information",
1665 "Print BIND information",
1666 "Print SONAME information",
1667 "Find a specified symbol",
1668 "Find a specified section",
1669 "Find a specified library",
1670 "Use strncmp to match libraries. (use with -N)",
1671 "Locate cause of TEXTREL",
1672 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1673 "Print only ELF files matching numeric bits",
1674 "Print Endianness",
1675 "Print OSABI",
1676 "Print EABI (EM_ARM Only)",
1677 "Print only ELF files matching octal permissions",
1678 "Print ELF file size",
1679 "Print all scanned info (-x -e -t -r -b)\n",
1680 "Only output 'bad' things",
1681 "Be verbose (can be specified more than once)",
1682 "Use specified format for output",
1683 "Read input stream from a filename",
1684 "Write output stream to a filename",
1685 "Don't display the header",
1686 "Print this help and exit",
1687 "Print version and exit",
1688 NULL
1689 };
1690
1691 /* display usage and exit */
1692 static void usage(int status)
1693 {
1694 unsigned long i;
1695 printf("* Scan ELF binaries for stuff\n\n"
1696 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1697 printf("Options: -[%s]\n", PARSE_FLAGS);
1698 for (i = 0; long_opts[i].name; ++i)
1699 if (long_opts[i].has_arg == no_argument)
1700 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
1701 long_opts[i].name, opts_help[i]);
1702 else
1703 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
1704 long_opts[i].name, opts_help[i]);
1705
1706 puts("\nFor more information, see the scanelf(1) manpage");
1707 exit(status);
1708 }
1709
1710 /* parse command line arguments and preform needed actions */
1711 #define do_pax_state(option, flag) \
1712 if (islower(option)) { \
1713 flags &= ~PF_##flag; \
1714 flags |= PF_NO##flag; \
1715 } else { \
1716 flags &= ~PF_NO##flag; \
1717 flags |= PF_##flag; \
1718 }
1719 static int parseargs(int argc, char *argv[])
1720 {
1721 int i;
1722 const char *from_file = NULL;
1723 int ret = 0;
1724
1725 opterr = 0;
1726 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1727 switch (i) {
1728
1729 case 'V':
1730 printf("pax-utils-%s: %s compiled %s\n%s\n"
1731 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
1732 VERSION, __FILE__, __DATE__, rcsid, argv0);
1733 exit(EXIT_SUCCESS);
1734 break;
1735 case 'h': usage(EXIT_SUCCESS); break;
1736 case 'f':
1737 if (from_file) warn("You prob don't want to specify -f twice");
1738 from_file = optarg;
1739 break;
1740 case 'E':
1741 strncpy(match_etypes, optarg, sizeof(match_etypes));
1742 break;
1743 case 'M':
1744 match_bits = atoi(optarg);
1745 if (match_bits == 0) {
1746 if (strcmp(optarg, "ELFCLASS32") == 0)
1747 match_bits = 32;
1748 if (strcmp(optarg, "ELFCLASS64") == 0)
1749 match_bits = 64;
1750 }
1751 break;
1752 case 'O':
1753 if (sscanf(optarg, "%o", &match_perms) == -1)
1754 match_bits = 0;
1755 break;
1756 case 'o': {
1757 if (freopen(optarg, "w", stdout) == NULL)
1758 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1759 break;
1760 }
1761 case 'k':
1762 if (find_section) warn("You prob don't want to specify -k twice");
1763 find_section = optarg;
1764 break;
1765 case 's': {
1766 if (find_sym) warn("You prob don't want to specify -s twice");
1767 find_sym = optarg;
1768 break;
1769 }
1770 case 'N': {
1771 if (find_lib) warn("You prob don't want to specify -N twice");
1772 find_lib = optarg;
1773 break;
1774 }
1775
1776 case 'F': {
1777 if (out_format) warn("You prob don't want to specify -F twice");
1778 out_format = optarg;
1779 break;
1780 }
1781 case 'z': {
1782 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1783 size_t x;
1784
1785 for (x = 0; x < strlen(optarg); x++) {
1786 switch (optarg[x]) {
1787 case 'p':
1788 case 'P':
1789 do_pax_state(optarg[x], PAGEEXEC);
1790 break;
1791 case 's':
1792 case 'S':
1793 do_pax_state(optarg[x], SEGMEXEC);
1794 break;
1795 case 'm':
1796 case 'M':
1797 do_pax_state(optarg[x], MPROTECT);
1798 break;
1799 case 'e':
1800 case 'E':
1801 do_pax_state(optarg[x], EMUTRAMP);
1802 break;
1803 case 'r':
1804 case 'R':
1805 do_pax_state(optarg[x], RANDMMAP);
1806 break;
1807 case 'x':
1808 case 'X':
1809 do_pax_state(optarg[x], RANDEXEC);
1810 break;
1811 default:
1812 break;
1813 }
1814 }
1815 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
1816 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
1817 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
1818 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
1819 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1820 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1821 setpax = flags;
1822 break;
1823 }
1824 case 'Z': show_size = 1; break;
1825 case 'g': g_match = 1; break;
1826 case 'L': use_ldcache = 1; break;
1827 case 'y': scan_symlink = 0; break;
1828 case 'A': scan_archives = 1; break;
1829 case 'B': show_banner = 0; break;
1830 case 'l': scan_ldpath = 1; break;
1831 case 'p': scan_envpath = 1; break;
1832 case 'R': dir_recurse = 1; break;
1833 case 'm': dir_crossmount = 0; break;
1834 case 'X': ++fix_elf; break;
1835 case 'x': show_pax = 1; break;
1836 case 'e': show_phdr = 1; break;
1837 case 't': show_textrel = 1; break;
1838 case 'r': show_rpath = 1; break;
1839 case 'n': show_needed = 1; break;
1840 case 'i': show_interp = 1; break;
1841 case 'b': show_bind = 1; break;
1842 case 'S': show_soname = 1; break;
1843 case 'T': show_textrels = 1; break;
1844 case 'q': be_quiet = 1; break;
1845 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1846 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
1847 case 'D': show_endian = 1; break;
1848 case 'I': show_osabi = 1; break;
1849 case 'Y': show_eabi = 1; break;
1850 case ':':
1851 err("Option '%c' is missing parameter", optopt);
1852 case '?':
1853 err("Unknown option '%c' or argument missing", optopt);
1854 default:
1855 err("Unhandled option '%c'; please report this", i);
1856 }
1857 }
1858 if (show_textrels && be_verbose) {
1859 if (which("objdump") != NULL)
1860 has_objdump = 1;
1861 }
1862 /* let the format option override all other options */
1863 if (out_format) {
1864 show_pax = show_phdr = show_textrel = show_rpath = \
1865 show_needed = show_interp = show_bind = show_soname = \
1866 show_textrels = show_perms = show_endian = show_size = \
1867 show_osabi = show_eabi = 0;
1868 for (i = 0; out_format[i]; ++i) {
1869 if (!IS_MODIFIER(out_format[i])) continue;
1870
1871 switch (out_format[++i]) {
1872 case '+': break;
1873 case '%': break;
1874 case '#': break;
1875 case 'F': break;
1876 case 'p': break;
1877 case 'f': break;
1878 case 'k': break;
1879 case 's': break;
1880 case 'N': break;
1881 case 'o': break;
1882 case 'a': break;
1883 case 'M': break;
1884 case 'Z': show_size = 1; break;
1885 case 'D': show_endian = 1; break;
1886 case 'I': show_osabi = 1; break;
1887 case 'Y': show_eabi = 1; break;
1888 case 'O': show_perms = 1; break;
1889 case 'x': show_pax = 1; break;
1890 case 'e': show_phdr = 1; break;
1891 case 't': show_textrel = 1; break;
1892 case 'r': show_rpath = 1; break;
1893 case 'n': show_needed = 1; break;
1894 case 'i': show_interp = 1; break;
1895 case 'b': show_bind = 1; break;
1896 case 'S': show_soname = 1; break;
1897 case 'T': show_textrels = 1; break;
1898 default:
1899 err("Invalid format specifier '%c' (byte %i)",
1900 out_format[i], i+1);
1901 }
1902 }
1903
1904 /* construct our default format */
1905 } else {
1906 size_t fmt_len = 30;
1907 out_format = xmalloc(sizeof(char) * fmt_len);
1908 *out_format = '\0';
1909 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1910 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1911 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
1912 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
1913 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
1914 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
1915 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
1916 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1917 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1918 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1919 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1920 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1921 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1922 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1923 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1924 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1925 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1926 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1927 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1928 }
1929 if (be_verbose > 2) printf("Format: %s\n", out_format);
1930
1931 /* now lets actually do the scanning */
1932 if (scan_ldpath || use_ldcache)
1933 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
1934 if (scan_ldpath) scanelf_ldpath();
1935 if (scan_envpath) scanelf_envpath();
1936 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
1937 from_file = "-";
1938 if (from_file) {
1939 scanelf_from_file(from_file);
1940 from_file = *argv;
1941 }
1942 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1943 err("Nothing to scan !?");
1944 while (optind < argc) {
1945 search_path = argv[optind++];
1946 ret = scanelf_dir(search_path);
1947 }
1948
1949 /* clean up */
1950 for (i = 0; ldpaths[i]; ++i)
1951 free(ldpaths[i]);
1952
1953 if (ldcache != 0)
1954 munmap(ldcache, ldcache_size);
1955 return ret;
1956 }
1957
1958 static char **get_split_env(const char *envvar)
1959 {
1960 const char *delims = " \t\n";
1961 char **envvals = NULL;
1962 char *env, *s;
1963 int nentry;
1964
1965 if ((env = getenv(envvar)) == NULL)
1966 return NULL;
1967
1968 env = xstrdup(env);
1969 if (env == NULL)
1970 return NULL;
1971
1972 s = strtok(env, delims);
1973 if (s == NULL) {
1974 free(env);
1975 return NULL;
1976 }
1977
1978 nentry = 0;
1979 while (s != NULL) {
1980 ++nentry;
1981 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
1982 envvals[nentry-1] = s;
1983 s = strtok(NULL, delims);
1984 }
1985 envvals[nentry] = NULL;
1986
1987 /* don't want to free(env) as it contains the memory that backs
1988 * the envvals array of strings */
1989 return envvals;
1990 }
1991
1992 static void parseenv(void)
1993 {
1994 qa_textrels = get_split_env("QA_TEXTRELS");
1995 qa_execstack = get_split_env("QA_EXECSTACK");
1996 qa_wx_load = get_split_env("QA_WX_LOAD");
1997 }
1998
1999 #ifdef __PAX_UTILS_CLEANUP
2000 static void cleanup(void)
2001 {
2002 free(out_format);
2003 free(qa_textrels);
2004 free(qa_execstack);
2005 free(qa_wx_load);
2006 }
2007 #endif
2008
2009 int main(int argc, char *argv[])
2010 {
2011 int ret;
2012 if (argc < 2)
2013 usage(EXIT_FAILURE);
2014 parseenv();
2015 ret = parseargs(argc, argv);
2016 fclose(stdout);
2017 #ifdef __PAX_UTILS_CLEANUP
2018 cleanup();
2019 warn("The calls to add/delete heap should be off:\n"
2020 "\t- 1 due to the out_buffer not being freed in scanelf_file()\n"
2021 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
2022 #endif
2023 return ret;
2024 }
2025
2026 /* Match filename against entries in matchlist, return TRUE
2027 * if the file is listed */
2028 static int file_matches_list(const char *filename, char **matchlist)
2029 {
2030 char **file;
2031 char *match;
2032 char buf[__PAX_UTILS_PATH_MAX];
2033
2034 if (matchlist == NULL)
2035 return 0;
2036
2037 for (file = matchlist; *file != NULL; file++) {
2038 if (search_path) {
2039 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2040 match = buf;
2041 } else {
2042 match = *file;
2043 }
2044 if (fnmatch(match, filename, 0) == 0)
2045 return 1;
2046 }
2047 return 0;
2048 }

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