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Revision 1.235 - (show annotations) (download) (as text)
Tue Dec 13 05:12:14 2011 UTC (2 years, 7 months ago) by vapier
Branch: MAIN
Changes since 1.234: +13 -7 lines
File MIME type: text/x-csrc
optimize fd closing when scanning ELFs to avoid double closing it

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 1.234 2011/10/13 04:49:30 vapier Exp $
5 *
6 * Copyright 2003-2007 Ned Ludd - <solar@gentoo.org>
7 * Copyright 2004-2007 Mike Frysinger - <vapier@gentoo.org>
8 */
9
10 static const char rcsid[] = "$Id: scanelf.c,v 1.234 2011/10/13 04:49:30 vapier Exp $";
11 const char 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
20 /* variables to control behavior */
21 static char *match_etypes = NULL;
22 static array_t _ldpaths = array_init_decl, *ldpaths = &_ldpaths;
23 static char scan_ldpath = 0;
24 static char scan_envpath = 0;
25 static char scan_symlink = 1;
26 static char scan_archives = 0;
27 static char dir_recurse = 0;
28 static char dir_crossmount = 1;
29 static char show_pax = 0;
30 static char show_perms = 0;
31 static char show_size = 0;
32 static char show_phdr = 0;
33 static char show_textrel = 0;
34 static char show_rpath = 0;
35 static char show_needed = 0;
36 static char show_interp = 0;
37 static char show_bind = 0;
38 static char show_soname = 0;
39 static char show_textrels = 0;
40 static char show_banner = 1;
41 static char show_endian = 0;
42 static char show_osabi = 0;
43 static char show_eabi = 0;
44 static char be_quiet = 0;
45 static char be_verbose = 0;
46 static char be_wewy_wewy_quiet = 0;
47 static char be_semi_verbose = 0;
48 static char *find_sym = NULL;
49 static char *find_lib = NULL;
50 static array_t _find_lib_arr = array_init_decl, *find_lib_arr = &_find_lib_arr;
51 static char *find_section = NULL;
52 static array_t _find_section_arr = array_init_decl, *find_section_arr = &_find_section_arr;
53 static char *out_format = NULL;
54 static char *search_path = NULL;
55 static char fix_elf = 0;
56 static char g_match = 0;
57 static char use_ldcache = 0;
58
59 static char **qa_textrels = NULL;
60 static char **qa_execstack = NULL;
61 static char **qa_wx_load = NULL;
62 static int root_fd = AT_FDCWD;
63
64 static int match_bits = 0;
65 static unsigned int match_perms = 0;
66 static void *ldcache = NULL;
67 static size_t ldcache_size = 0;
68 static unsigned long setpax = 0UL;
69
70 static int has_objdump = 0;
71
72 /* find the path to a file by name */
73 static int bin_in_path(const char *fname)
74 {
75 char fullpath[__PAX_UTILS_PATH_MAX];
76 char *path, *p;
77
78 path = getenv("PATH");
79 if (!path)
80 return 0;
81
82 while ((p = strrchr(path, ':')) != NULL) {
83 snprintf(fullpath, sizeof(fullpath), "%s/%s", p + 1, fname);
84 *p = 0;
85 if (access(fullpath, R_OK) != -1)
86 return 1;
87 }
88
89 return 0;
90 }
91
92 static FILE *fopenat_r(int dir_fd, const char *path)
93 {
94 int fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
95 if (fd == -1)
96 return NULL;
97 return fdopen(fd, "re");
98 }
99
100 static const char *root_rel_path(const char *path)
101 {
102 /*
103 * openat() will ignore the dirfd if path starts with
104 * a /, so consume all of that noise
105 *
106 * XXX: we don't handle relative paths like ../ that
107 * break out of the --root option, but for now, just
108 * don't do that :P.
109 */
110 if (root_fd != AT_FDCWD) {
111 while (*path == '/')
112 ++path;
113 if (*path == '\0')
114 path = ".";
115 }
116
117 return path;
118 }
119
120 /* 1 on failure. 0 otherwise */
121 static int rematch(const char *regex, const char *match, int cflags)
122 {
123 regex_t preg;
124 int ret;
125
126 if ((match == NULL) || (regex == NULL))
127 return EXIT_FAILURE;
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_fileat() */
146 static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **str)
147 {
148 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
149
150 /* debug sections */
151 void *symtab = elf_findsecbyname(elf, ".symtab");
152 void *strtab = elf_findsecbyname(elf, ".strtab");
153 /* runtime sections */
154 void *dynsym = elf_findsecbyname(elf, ".dynsym");
155 void *dynstr = elf_findsecbyname(elf, ".dynstr");
156
157 #define GET_SYMTABS(B) \
158 if (elf->elf_class == ELFCLASS ## B) { \
159 if (symtab && dynsym) { \
160 Elf ## B ## _Shdr *esymtab = symtab; \
161 Elf ## B ## _Shdr *edynsym = dynsym; \
162 *sym = (EGET(esymtab->sh_size) > EGET(edynsym->sh_size)) ? symtab : dynsym; \
163 } else \
164 *sym = symtab ? symtab : dynsym; \
165 if (strtab && dynstr) { \
166 Elf ## B ## _Shdr *estrtab = strtab; \
167 Elf ## B ## _Shdr *edynstr = dynstr; \
168 *str = (EGET(estrtab->sh_size) > EGET(edynstr->sh_size)) ? strtab : dynstr; \
169 } else \
170 *str = strtab ? strtab : dynstr; \
171 }
172 GET_SYMTABS(32)
173 GET_SYMTABS(64)
174
175 if (*sym && *str)
176 return;
177
178 /*
179 * damn, they're really going to make us work for it huh?
180 * reconstruct the section header info out of the dynamic
181 * tags so we can see what symbols this guy uses at runtime.
182 */
183 #define GET_SYMTABS_DT(B) \
184 if (elf->elf_class == ELFCLASS ## B) { \
185 size_t i; \
186 static Elf ## B ## _Shdr sym_shdr, str_shdr; \
187 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
188 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
189 Elf ## B ## _Addr vsym, vstr, vhash, vgnu_hash; \
190 Elf ## B ## _Dyn *dyn; \
191 Elf ## B ## _Off offset; \
192 \
193 /* lookup symbols used at runtime with DT_SYMTAB / DT_STRTAB */ \
194 vsym = vstr = vhash = vgnu_hash = 0; \
195 memset(&sym_shdr, 0, sizeof(sym_shdr)); \
196 memset(&str_shdr, 0, sizeof(str_shdr)); \
197 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
198 if (EGET(phdr[i].p_type) != PT_DYNAMIC) \
199 continue; \
200 \
201 offset = EGET(phdr[i].p_offset); \
202 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
203 continue; \
204 \
205 dyn = DYN ## B (elf->vdata + offset); \
206 while (EGET(dyn->d_tag) != DT_NULL) { \
207 switch (EGET(dyn->d_tag)) { \
208 case DT_SYMTAB: vsym = EGET(dyn->d_un.d_val); break; \
209 case DT_SYMENT: sym_shdr.sh_entsize = dyn->d_un.d_val; break; \
210 case DT_STRTAB: vstr = EGET(dyn->d_un.d_val); break; \
211 case DT_STRSZ: str_shdr.sh_size = dyn->d_un.d_val; break; \
212 case DT_HASH: vhash = EGET(dyn->d_un.d_val); break; \
213 /*case DT_GNU_HASH: vgnu_hash = EGET(dyn->d_un.d_val); break;*/ \
214 } \
215 ++dyn; \
216 } \
217 if (vsym && vstr) \
218 break; \
219 } \
220 if (!vsym || !vstr || !(vhash || vgnu_hash)) \
221 return; \
222 \
223 /* calc offset into the ELF by finding the load addr of the syms */ \
224 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
225 Elf ## B ## _Addr vaddr = EGET(phdr[i].p_vaddr); \
226 Elf ## B ## _Addr filesz = EGET(phdr[i].p_filesz); \
227 offset = EGET(phdr[i].p_offset); \
228 \
229 if (EGET(phdr[i].p_type) != PT_LOAD) \
230 continue; \
231 \
232 if (vhash >= vaddr && vhash < vaddr + filesz) { \
233 /* Scan the hash table to see how many entries we have */ \
234 Elf32_Word max_sym_idx = 0; \
235 Elf32_Word *hashtbl = elf->vdata + offset + (vhash - vaddr); \
236 Elf32_Word b, nbuckets = EGET(hashtbl[0]); \
237 Elf32_Word nchains = EGET(hashtbl[1]); \
238 Elf32_Word *buckets = &hashtbl[2]; \
239 Elf32_Word *chains = &buckets[nbuckets]; \
240 Elf32_Word sym_idx; \
241 \
242 for (b = 0; b < nbuckets; ++b) { \
243 if (!buckets[b]) \
244 continue; \
245 for (sym_idx = buckets[b]; sym_idx < nchains && sym_idx; sym_idx = chains[sym_idx]) \
246 if (max_sym_idx < sym_idx) \
247 max_sym_idx = sym_idx; \
248 } \
249 ESET(sym_shdr.sh_size, sym_shdr.sh_entsize * max_sym_idx); \
250 } \
251 \
252 if (vsym >= vaddr && vsym < vaddr + filesz) { \
253 ESET(sym_shdr.sh_offset, offset + (vsym - vaddr)); \
254 *sym = &sym_shdr; \
255 } \
256 \
257 if (vstr >= vaddr && vstr < vaddr + filesz) { \
258 ESET(str_shdr.sh_offset, offset + (vstr - vaddr)); \
259 *str = &str_shdr; \
260 } \
261 } \
262 }
263 GET_SYMTABS_DT(32)
264 GET_SYMTABS_DT(64)
265 }
266
267 static char *scanelf_file_pax(elfobj *elf, char *found_pax)
268 {
269 static char ret[7];
270 unsigned long i, shown;
271
272 if (!show_pax) return NULL;
273
274 shown = 0;
275 memset(&ret, 0, sizeof(ret));
276
277 if (elf->phdr) {
278 #define SHOW_PAX(B) \
279 if (elf->elf_class == ELFCLASS ## B) { \
280 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
281 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
282 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
283 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
284 continue; \
285 if (fix_elf && setpax) { \
286 /* set the paxctl flags */ \
287 ESET(phdr[i].p_flags, setpax); \
288 } \
289 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
290 continue; \
291 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
292 *found_pax = 1; \
293 ++shown; \
294 break; \
295 } \
296 }
297 SHOW_PAX(32)
298 SHOW_PAX(64)
299 }
300
301 if (fix_elf && setpax) {
302 /* set the chpax settings */
303 if (elf->elf_class == ELFCLASS32) {
304 if (EHDR32(elf->ehdr)->e_type == ET_DYN || EHDR32(elf->ehdr)->e_type == ET_EXEC)
305 ESET(EHDR32(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
306 } else {
307 if (EHDR64(elf->ehdr)->e_type == ET_DYN || EHDR64(elf->ehdr)->e_type == ET_EXEC)
308 ESET(EHDR64(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
309 }
310 }
311
312 /* fall back to EI_PAX if no PT_PAX was found */
313 if (!*ret) {
314 static char *paxflags;
315 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
316 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
317 *found_pax = 1;
318 return (be_wewy_wewy_quiet ? NULL : paxflags);
319 }
320 strncpy(ret, paxflags, sizeof(ret));
321 }
322
323 if (be_wewy_wewy_quiet || (be_quiet && !shown))
324 return NULL;
325 else
326 return ret;
327 }
328
329 static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
330 {
331 static char ret[12];
332 char *found;
333 unsigned long i, shown, multi_stack, multi_relro, multi_load;
334 int max_pt_load;
335
336 if (!show_phdr) return NULL;
337
338 memcpy(ret, "--- --- ---\0", 12);
339
340 shown = 0;
341 multi_stack = multi_relro = multi_load = 0;
342 max_pt_load = elf_max_pt_load(elf);
343
344 #define NOTE_GNU_STACK ".note.GNU-stack"
345 #define SHOW_PHDR(B) \
346 if (elf->elf_class == ELFCLASS ## B) { \
347 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
348 Elf ## B ## _Off offset; \
349 uint32_t flags, check_flags; \
350 if (elf->phdr != NULL) { \
351 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
352 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
353 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
354 if (multi_stack++) \
355 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
356 if (file_matches_list(elf->filename, qa_execstack)) \
357 continue; \
358 found = found_phdr; \
359 offset = 0; \
360 check_flags = PF_X; \
361 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
362 if (multi_relro++) \
363 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
364 found = found_relro; \
365 offset = 4; \
366 check_flags = PF_X; \
367 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
368 if (EGET(ehdr->e_type) == ET_DYN || EGET(ehdr->e_type) == ET_EXEC) \
369 if (multi_load++ > max_pt_load) \
370 warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
371 if (file_matches_list(elf->filename, qa_wx_load)) \
372 continue; \
373 found = found_load; \
374 offset = 8; \
375 check_flags = PF_W|PF_X; \
376 } else \
377 continue; \
378 flags = EGET(phdr[i].p_flags); \
379 if (be_quiet && ((flags & check_flags) != check_flags)) \
380 continue; \
381 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
382 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
383 ret[3] = ret[7] = '!'; \
384 flags = EGET(phdr[i].p_flags); \
385 } \
386 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
387 *found = 1; \
388 ++shown; \
389 } \
390 } else if (elf->shdr != NULL) { \
391 /* no program headers which means this is prob an object file */ \
392 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
393 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
394 char *str; \
395 if ((void*)strtbl > elf->data_end) \
396 goto skip_this_shdr##B; \
397 check_flags = SHF_WRITE|SHF_EXECINSTR; \
398 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
399 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
400 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
401 str = elf->data + offset; \
402 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
403 if (!strcmp(str, NOTE_GNU_STACK)) { \
404 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
405 flags = EGET(shdr[i].sh_flags); \
406 if (be_quiet && ((flags & check_flags) != check_flags)) \
407 continue; \
408 ++*found_phdr; \
409 shown = 1; \
410 if (flags & SHF_WRITE) ret[0] = 'W'; \
411 if (flags & SHF_ALLOC) ret[1] = 'A'; \
412 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
413 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
414 break; \
415 } \
416 } \
417 skip_this_shdr##B: \
418 if (!multi_stack) { \
419 if (file_matches_list(elf->filename, qa_execstack)) \
420 return NULL; \
421 *found_phdr = 1; \
422 shown = 1; \
423 memcpy(ret, "!WX", 3); \
424 } \
425 } \
426 }
427 SHOW_PHDR(32)
428 SHOW_PHDR(64)
429
430 if (be_wewy_wewy_quiet || (be_quiet && !shown))
431 return NULL;
432 else
433 return ret;
434 }
435
436 /*
437 * See if this ELF contains a DT_TEXTREL tag in any of its
438 * PT_DYNAMIC sections.
439 */
440 static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
441 {
442 static const char *ret = "TEXTREL";
443 unsigned long i;
444
445 if (!show_textrel && !show_textrels) return NULL;
446
447 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
448
449 if (elf->phdr) {
450 #define SHOW_TEXTREL(B) \
451 if (elf->elf_class == ELFCLASS ## B) { \
452 Elf ## B ## _Dyn *dyn; \
453 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
454 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
455 Elf ## B ## _Off offset; \
456 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
457 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
458 offset = EGET(phdr[i].p_offset); \
459 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
460 dyn = DYN ## B (elf->vdata + offset); \
461 while (EGET(dyn->d_tag) != DT_NULL) { \
462 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
463 *found_textrel = 1; \
464 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
465 return (be_wewy_wewy_quiet ? NULL : ret); \
466 } \
467 ++dyn; \
468 } \
469 } }
470 SHOW_TEXTREL(32)
471 SHOW_TEXTREL(64)
472 }
473
474 if (be_quiet || be_wewy_wewy_quiet)
475 return NULL;
476 else
477 return " - ";
478 }
479
480 /*
481 * Scan the .text section to see if there are any relocations in it.
482 * Should rewrite this to check PT_LOAD sections that are marked
483 * Executable rather than the section named '.text'.
484 */
485 static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
486 {
487 unsigned long s, r, rmax;
488 void *symtab_void, *strtab_void, *text_void;
489
490 if (!show_textrels) return NULL;
491
492 /* don't search for TEXTREL's if the ELF doesn't have any */
493 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
494 if (!*found_textrel) return NULL;
495
496 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
497 text_void = elf_findsecbyname(elf, ".text");
498
499 if (symtab_void && strtab_void && text_void && elf->shdr) {
500 #define SHOW_TEXTRELS(B) \
501 if (elf->elf_class == ELFCLASS ## B) { \
502 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
503 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
504 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
505 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
506 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
507 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
508 uint ## B ## _t memsz = EGET(text->sh_size); \
509 Elf ## B ## _Rel *rel; \
510 Elf ## B ## _Rela *rela; \
511 /* search the section headers for relocations */ \
512 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
513 uint32_t sh_type = EGET(shdr[s].sh_type); \
514 if (sh_type == SHT_REL) { \
515 rel = REL ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
516 rela = NULL; \
517 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
518 } else if (sh_type == SHT_RELA) { \
519 rel = NULL; \
520 rela = RELA ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
521 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
522 } else \
523 continue; \
524 /* now see if any of the relocs are in the .text */ \
525 for (r = 0; r < rmax; ++r) { \
526 unsigned long sym_max; \
527 Elf ## B ## _Addr offset_tmp; \
528 Elf ## B ## _Sym *func; \
529 Elf ## B ## _Sym *sym; \
530 Elf ## B ## _Addr r_offset; \
531 uint ## B ## _t r_info; \
532 if (sh_type == SHT_REL) { \
533 r_offset = EGET(rel[r].r_offset); \
534 r_info = EGET(rel[r].r_info); \
535 } else { \
536 r_offset = EGET(rela[r].r_offset); \
537 r_info = EGET(rela[r].r_info); \
538 } \
539 /* make sure this relocation is inside of the .text */ \
540 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
541 if (be_verbose <= 2) continue; \
542 } else \
543 *found_textrels = 1; \
544 /* locate this relocation symbol name */ \
545 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
546 if ((void*)sym > elf->data_end) { \
547 warn("%s: corrupt ELF symbol", elf->filename); \
548 continue; \
549 } \
550 sym_max = ELF ## B ## _R_SYM(r_info); \
551 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
552 sym += sym_max; \
553 else \
554 sym = NULL; \
555 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
556 /* show the raw details about this reloc */ \
557 printf(" %s: ", elf->base_filename); \
558 if (sym && sym->st_name) \
559 printf("%s", elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
560 else \
561 printf("(memory/data?)"); \
562 printf(" [0x%lX]", (unsigned long)r_offset); \
563 /* now try to find the closest symbol that this rel is probably in */ \
564 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
565 func = NULL; \
566 offset_tmp = 0; \
567 while (sym_max--) { \
568 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
569 func = sym; \
570 offset_tmp = EGET(sym->st_value); \
571 } \
572 ++sym; \
573 } \
574 printf(" in "); \
575 if (func && func->st_name) { \
576 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
577 if (r_offset > EGET(func->st_size)) \
578 printf("(optimized out: previous %s)", func_name); \
579 else \
580 printf("%s", func_name); \
581 } else \
582 printf("(optimized out)"); \
583 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
584 if (be_verbose && has_objdump) { \
585 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
586 char *sysbuf; \
587 size_t syslen; \
588 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"; \
589 syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
590 sysbuf = xmalloc(syslen); \
591 if (end_addr < r_offset) \
592 /* not uncommon when things are optimized out */ \
593 end_addr = r_offset + 0x100; \
594 snprintf(sysbuf, syslen, sysfmt, \
595 (unsigned long)offset_tmp, \
596 (unsigned long)end_addr, \
597 elf->filename, \
598 (unsigned long)r_offset); \
599 fflush(stdout); \
600 if (system(sysbuf)) /* don't care */; \
601 fflush(stdout); \
602 free(sysbuf); \
603 } \
604 } \
605 } }
606 SHOW_TEXTRELS(32)
607 SHOW_TEXTRELS(64)
608 }
609 if (!*found_textrels)
610 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
611
612 return NULL;
613 }
614
615 static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
616 {
617 struct stat st;
618 switch (*item) {
619 case '/': break;
620 case '.':
621 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
622 break;
623 case ':':
624 case '\0':
625 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
626 break;
627 case '$':
628 if (fstat(elf->fd, &st) != -1)
629 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
630 warnf("Security problem with %s='%s' in %s with mode set of %o",
631 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
632 break;
633 default:
634 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
635 break;
636 }
637 }
638 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
639 {
640 unsigned long i;
641 char *rpath, *runpath, **r;
642 void *strtbl_void;
643
644 if (!show_rpath) return;
645
646 strtbl_void = elf_findsecbyname(elf, ".dynstr");
647 rpath = runpath = NULL;
648
649 if (elf->phdr && strtbl_void) {
650 #define SHOW_RPATH(B) \
651 if (elf->elf_class == ELFCLASS ## B) { \
652 Elf ## B ## _Dyn *dyn; \
653 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
654 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
655 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
656 Elf ## B ## _Off offset; \
657 Elf ## B ## _Xword word; \
658 /* Scan all the program headers */ \
659 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
660 /* Just scan dynamic headers */ \
661 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
662 offset = EGET(phdr[i].p_offset); \
663 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
664 /* Just scan dynamic RPATH/RUNPATH headers */ \
665 dyn = DYN ## B (elf->vdata + offset); \
666 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
667 if (word == DT_RPATH) { \
668 r = &rpath; \
669 } else if (word == DT_RUNPATH) { \
670 r = &runpath; \
671 } else { \
672 ++dyn; \
673 continue; \
674 } \
675 /* Verify the memory is somewhat sane */ \
676 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
677 if (offset < (Elf ## B ## _Off)elf->len) { \
678 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
679 *r = elf->data + offset; \
680 /* cache the length in case we need to nuke this section later on */ \
681 if (fix_elf) \
682 offset = strlen(*r); \
683 /* If quiet, don't output paths in ld.so.conf */ \
684 if (be_quiet) { \
685 size_t len; \
686 char *start, *end; \
687 /* note that we only 'chop' off leading known paths. */ \
688 /* since *r is read-only memory, we can only move the ptr forward. */ \
689 start = *r; \
690 /* scan each path in : delimited list */ \
691 while (start) { \
692 rpath_security_checks(elf, start, get_elfdtype(word)); \
693 end = strchr(start, ':'); \
694 len = (end ? abs(end - start) : strlen(start)); \
695 if (use_ldcache) { \
696 size_t n; \
697 const char *ldpath; \
698 array_for_each(ldpaths, n, ldpath) \
699 if (!strncmp(ldpath, start, len) && !ldpath[len]) { \
700 *r = end; \
701 /* corner case ... if RPATH reads "/usr/lib:", we want \
702 * to show ':' rather than '' */ \
703 if (end && end[1] != '\0') \
704 (*r)++; \
705 break; \
706 } \
707 } \
708 if (!*r || !end) \
709 break; \
710 else \
711 start = start + len + 1; \
712 } \
713 } \
714 if (*r) { \
715 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
716 /* just nuke it */ \
717 nuke_it##B: \
718 memset(*r, 0x00, offset); \
719 *r = NULL; \
720 ESET(dyn->d_tag, DT_DEBUG); \
721 ESET(dyn->d_un.d_ptr, 0); \
722 } else if (fix_elf) { \
723 /* try to clean "bad" paths */ \
724 size_t len, tmpdir_len; \
725 char *start, *end; \
726 const char *tmpdir; \
727 start = *r; \
728 tmpdir = (getenv("TMPDIR") ? : "."); \
729 tmpdir_len = strlen(tmpdir); \
730 while (1) { \
731 end = strchr(start, ':'); \
732 if (start == end) { \
733 eat_this_path##B: \
734 len = strlen(end); \
735 memmove(start, end+1, len); \
736 start[len-1] = '\0'; \
737 end = start - 1; \
738 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
739 if (!end) { \
740 if (start == *r) \
741 goto nuke_it##B; \
742 *--start = '\0'; \
743 } else \
744 goto eat_this_path##B; \
745 } \
746 if (!end) \
747 break; \
748 start = end + 1; \
749 } \
750 if (**r == '\0') \
751 goto nuke_it##B; \
752 } \
753 if (*r) \
754 *found_rpath = 1; \
755 } \
756 } \
757 ++dyn; \
758 } \
759 } }
760 SHOW_RPATH(32)
761 SHOW_RPATH(64)
762 }
763
764 if (be_wewy_wewy_quiet) return;
765
766 if (rpath && runpath) {
767 if (!strcmp(rpath, runpath)) {
768 xstrcat(ret, runpath, ret_len);
769 } else {
770 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
771 xchrcat(ret, '{', ret_len);
772 xstrcat(ret, rpath, ret_len);
773 xchrcat(ret, ',', ret_len);
774 xstrcat(ret, runpath, ret_len);
775 xchrcat(ret, '}', ret_len);
776 }
777 } else if (rpath || runpath)
778 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
779 else if (!be_quiet)
780 xstrcat(ret, " - ", ret_len);
781 }
782
783 #define LDSO_CACHE_MAGIC "ld.so-"
784 #define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
785 #define LDSO_CACHE_VER "1.7.0"
786 #define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
787 #define FLAG_ANY -1
788 #define FLAG_TYPE_MASK 0x00ff
789 #define FLAG_LIBC4 0x0000
790 #define FLAG_ELF 0x0001
791 #define FLAG_ELF_LIBC5 0x0002
792 #define FLAG_ELF_LIBC6 0x0003
793 #define FLAG_REQUIRED_MASK 0xff00
794 #define FLAG_SPARC_LIB64 0x0100
795 #define FLAG_IA64_LIB64 0x0200
796 #define FLAG_X8664_LIB64 0x0300
797 #define FLAG_S390_LIB64 0x0400
798 #define FLAG_POWERPC_LIB64 0x0500
799 #define FLAG_MIPS64_LIBN32 0x0600
800 #define FLAG_MIPS64_LIBN64 0x0700
801
802 #if defined(__GLIBC__) || defined(__UCLIBC__)
803
804 static char *lookup_cache_lib(elfobj *elf, char *fname)
805 {
806 int fd;
807 char *strs;
808 static char buf[__PAX_UTILS_PATH_MAX] = "";
809 const char *cachefile = root_rel_path("/etc/ld.so.cache");
810 struct stat st;
811
812 typedef struct {
813 char magic[LDSO_CACHE_MAGIC_LEN];
814 char version[LDSO_CACHE_VER_LEN];
815 int nlibs;
816 } header_t;
817 header_t *header;
818
819 typedef struct {
820 int flags;
821 int sooffset;
822 int liboffset;
823 } libentry_t;
824 libentry_t *libent;
825
826 if (fname == NULL)
827 return NULL;
828
829 if (ldcache == NULL) {
830 if (fstatat(root_fd, cachefile, &st, 0))
831 return NULL;
832
833 fd = openat(root_fd, cachefile, O_RDONLY);
834 if (fd == -1)
835 return NULL;
836
837 /* cache these values so we only map/unmap the cache file once */
838 ldcache_size = st.st_size;
839 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
840 close(fd);
841
842 if (ldcache == MAP_FAILED) {
843 ldcache = NULL;
844 return NULL;
845 }
846
847 if (memcmp(header->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN) ||
848 memcmp(header->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
849 {
850 munmap(ldcache, ldcache_size);
851 ldcache = NULL;
852 return NULL;
853 }
854 } else
855 header = ldcache;
856
857 libent = ldcache + sizeof(header_t);
858 strs = (char *) &libent[header->nlibs];
859
860 for (fd = 0; fd < header->nlibs; ++fd) {
861 /* This should be more fine grained, but for now we assume that
862 * diff arches will not be cached together, and we ignore the
863 * the different multilib mips cases.
864 */
865 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
866 continue;
867 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
868 continue;
869
870 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
871 continue;
872
873 /* Return first hit because that is how the ldso rolls */
874 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
875 break;
876 }
877
878 return buf;
879 }
880
881 #elif defined(__NetBSD__)
882 static char *lookup_cache_lib(elfobj *elf, char *fname)
883 {
884 static char buf[__PAX_UTILS_PATH_MAX] = "";
885 static struct stat st;
886 size_t n;
887 char *ldpath;
888
889 array_for_each(ldpath, n, ldpath) {
890 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", ldpath, fname) >= sizeof(buf))
891 continue; /* if the pathname is too long, or something went wrong, ignore */
892
893 if (stat(buf, &st) != 0)
894 continue; /* if the lib doesn't exist in *ldpath, look further */
895
896 /* NetBSD doesn't actually do sanity checks, it just loads the file
897 * and if that doesn't work, continues looking in other directories.
898 * This cannot easily be safely emulated, unfortunately. For now,
899 * just assume that if it exists, it's a valid library. */
900
901 return buf;
902 }
903
904 /* not found in any path */
905 return NULL;
906 }
907 #else
908 #ifdef __ELF__
909 #warning Cache support not implemented for your target
910 #endif
911 static char *lookup_cache_lib(elfobj *elf, char *fname)
912 {
913 return NULL;
914 }
915 #endif
916
917 static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
918 {
919 unsigned long i;
920 char *needed;
921 void *strtbl_void;
922 char *p;
923
924 /*
925 * -n -> op==0 -> print all
926 * -N -> op==1 -> print requested
927 */
928 if ((op == 0 && !show_needed) || (op == 1 && !find_lib))
929 return NULL;
930
931 strtbl_void = elf_findsecbyname(elf, ".dynstr");
932
933 if (elf->phdr && strtbl_void) {
934 #define SHOW_NEEDED(B) \
935 if (elf->elf_class == ELFCLASS ## B) { \
936 Elf ## B ## _Dyn *dyn; \
937 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
938 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
939 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
940 Elf ## B ## _Off offset; \
941 size_t matched = 0; \
942 /* Walk all the program headers to find the PT_DYNAMIC */ \
943 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
944 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) \
945 continue; \
946 offset = EGET(phdr[i].p_offset); \
947 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
948 continue; \
949 /* Walk all the dynamic tags to find NEEDED entries */ \
950 dyn = DYN ## B (elf->vdata + offset); \
951 while (EGET(dyn->d_tag) != DT_NULL) { \
952 if (EGET(dyn->d_tag) == DT_NEEDED) { \
953 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
954 if (offset >= (Elf ## B ## _Off)elf->len) { \
955 ++dyn; \
956 continue; \
957 } \
958 needed = elf->data + offset; \
959 if (op == 0) { \
960 /* -n -> print all entries */ \
961 if (!be_wewy_wewy_quiet) { \
962 if (*found_needed) xchrcat(ret, ',', ret_len); \
963 if (use_ldcache) \
964 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
965 needed = p; \
966 xstrcat(ret, needed, ret_len); \
967 } \
968 *found_needed = 1; \
969 } else { \
970 /* -N -> print matching entries */ \
971 size_t n; \
972 const char *find_lib_name; \
973 \
974 array_for_each(find_lib_arr, n, find_lib_name) \
975 if (!strcmp(find_lib_name, needed)) \
976 ++matched; \
977 \
978 if (matched == array_cnt(find_lib_arr)) { \
979 *found_lib = 1; \
980 return (be_wewy_wewy_quiet ? NULL : find_lib); \
981 } \
982 } \
983 } \
984 ++dyn; \
985 } \
986 } }
987 SHOW_NEEDED(32)
988 SHOW_NEEDED(64)
989 if (op == 0 && !*found_needed && be_verbose)
990 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
991 }
992
993 return NULL;
994 }
995 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
996 {
997 void *strtbl_void;
998
999 if (!show_interp) return NULL;
1000
1001 strtbl_void = elf_findsecbyname(elf, ".interp");
1002
1003 if (strtbl_void) {
1004 #define SHOW_INTERP(B) \
1005 if (elf->elf_class == ELFCLASS ## B) { \
1006 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
1007 *found_interp = 1; \
1008 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
1009 }
1010 SHOW_INTERP(32)
1011 SHOW_INTERP(64)
1012 }
1013 return NULL;
1014 }
1015 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
1016 {
1017 unsigned long i;
1018 struct stat s;
1019 char dynamic = 0;
1020
1021 if (!show_bind) return NULL;
1022 if (!elf->phdr) return NULL;
1023
1024 #define SHOW_BIND(B) \
1025 if (elf->elf_class == ELFCLASS ## B) { \
1026 Elf ## B ## _Dyn *dyn; \
1027 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1028 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1029 Elf ## B ## _Off offset; \
1030 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1031 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1032 dynamic = 1; \
1033 offset = EGET(phdr[i].p_offset); \
1034 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
1035 dyn = DYN ## B (elf->vdata + offset); \
1036 while (EGET(dyn->d_tag) != DT_NULL) { \
1037 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
1038 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
1039 { \
1040 if (be_quiet) return NULL; \
1041 *found_bind = 1; \
1042 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
1043 } \
1044 ++dyn; \
1045 } \
1046 } \
1047 }
1048 SHOW_BIND(32)
1049 SHOW_BIND(64)
1050
1051 if (be_wewy_wewy_quiet) return NULL;
1052
1053 /* don't output anything if quiet mode and the ELF is static or not setuid */
1054 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
1055 return NULL;
1056 } else {
1057 *found_bind = 1;
1058 return (char *)(dynamic ? "LAZY" : "STATIC");
1059 }
1060 }
1061 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
1062 {
1063 unsigned long i;
1064 char *soname;
1065 void *strtbl_void;
1066
1067 if (!show_soname) return NULL;
1068
1069 strtbl_void = elf_findsecbyname(elf, ".dynstr");
1070
1071 if (elf->phdr && strtbl_void) {
1072 #define SHOW_SONAME(B) \
1073 if (elf->elf_class == ELFCLASS ## B) { \
1074 Elf ## B ## _Dyn *dyn; \
1075 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1076 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1077 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
1078 Elf ## B ## _Off offset; \
1079 /* only look for soname in shared objects */ \
1080 if (EGET(ehdr->e_type) != ET_DYN) \
1081 return NULL; \
1082 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1083 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1084 offset = EGET(phdr[i].p_offset); \
1085 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
1086 dyn = DYN ## B (elf->vdata + offset); \
1087 while (EGET(dyn->d_tag) != DT_NULL) { \
1088 if (EGET(dyn->d_tag) == DT_SONAME) { \
1089 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
1090 if (offset >= (Elf ## B ## _Off)elf->len) { \
1091 ++dyn; \
1092 continue; \
1093 } \
1094 soname = elf->data + offset; \
1095 *found_soname = 1; \
1096 return (be_wewy_wewy_quiet ? NULL : soname); \
1097 } \
1098 ++dyn; \
1099 } \
1100 } }
1101 SHOW_SONAME(32)
1102 SHOW_SONAME(64)
1103 }
1104
1105 return NULL;
1106 }
1107
1108 /*
1109 * We support the symbol form:
1110 * [%[modifiers]%][[+-]<symbol name>][,[.....]]
1111 * If the symbol name is empty, then all symbols are matched.
1112 * If the symbol name is a glob ("*"), then all symbols are dumped (debug).
1113 * Do not rely on this output format at all.
1114 * Otherwise the symbol name is used to search (either regex or string compare).
1115 * If the first char of the symbol name is a plus ("+"), then only match
1116 * defined symbols. If it's a minus ("-"), only match undefined symbols.
1117 * Putting modifiers in between the percent signs allows for more in depth
1118 * filters. There are groups of modifiers. If you don't specify a member
1119 * of a group, then all types in that group are matched. The current
1120 * groups and their types are:
1121 * STT group: STT_NOTYPE:n STT_OBJECT:o STT_FUNC:f SST_FILE:F
1122 * STB group: STB_LOCAL:l STB_GLOBAL:g STB_WEAK:w
1123 * SHN group: SHN_UNDEF:u SHN_ABS:a SHN_COMMON:c {defined}:d
1124 * The "defined" value in the SHN group does not correspond to a SHN_xxx define.
1125 * You can search for multiple symbols at once by seperating with a comma (",").
1126 *
1127 * Some examples:
1128 * ELFs with a weak function "foo":
1129 * scanelf -s %wf%foo <ELFs>
1130 * ELFs that define the symbol "main":
1131 * scanelf -s +main <ELFs>
1132 * scanelf -s %d%main <ELFs>
1133 * ELFs that refer to the undefined symbol "brk":
1134 * scanelf -s -brk <ELFs>
1135 * scanelf -s %u%brk <ELFs>
1136 * All global defined objects in an ELF:
1137 * scanelf -s %ogd% <ELF>
1138 */
1139 static void
1140 scanelf_match_symname(elfobj *elf, char *found_sym, char **ret, size_t *ret_len, const char *symname,
1141 unsigned int stt, unsigned int stb, unsigned int shn, unsigned long size)
1142 {
1143 char *this_sym, *next_sym, saved = saved;
1144
1145 /* allow the user to specify a comma delimited list of symbols to search for */
1146 next_sym = NULL;
1147 do {
1148 bool inc_notype, inc_object, inc_func, inc_file,
1149 inc_local, inc_global, inc_weak,
1150 inc_def, inc_undef, inc_abs, inc_common;
1151
1152 if (next_sym) {
1153 next_sym[-1] = saved;
1154 this_sym = next_sym;
1155 } else
1156 this_sym = find_sym;
1157 if ((next_sym = strchr(this_sym, ','))) {
1158 /* make parsing easier by killing the comma temporarily */
1159 saved = *next_sym;
1160 *next_sym = '\0';
1161 next_sym += 1;
1162 }
1163
1164 /* symbol selection! */
1165 inc_notype = inc_object = inc_func = inc_file = \
1166 inc_local = inc_global = inc_weak = \
1167 inc_def = inc_undef = inc_abs = inc_common = \
1168 (*this_sym != '%');
1169
1170 /* parse the contents of %...% */
1171 if (!inc_notype) {
1172 while (*(this_sym++)) {
1173 if (*this_sym == '%') {
1174 ++this_sym;
1175 break;
1176 }
1177 switch (*this_sym) {
1178 case 'n': inc_notype = true; break;
1179 case 'o': inc_object = true; break;
1180 case 'f': inc_func = true; break;
1181 case 'F': inc_file = true; break;
1182 case 'l': inc_local = true; break;
1183 case 'g': inc_global = true; break;
1184 case 'w': inc_weak = true; break;
1185 case 'd': inc_def = true; break;
1186 case 'u': inc_undef = true; break;
1187 case 'a': inc_abs = true; break;
1188 case 'c': inc_common = true; break;
1189 default: err("invalid symbol selector '%c'", *this_sym);
1190 }
1191 }
1192
1193 /* If no types are matched, not match all */
1194 if (!inc_notype && !inc_object && !inc_func && !inc_file)
1195 inc_notype = inc_object = inc_func = inc_file = true;
1196 if (!inc_local && !inc_global && !inc_weak)
1197 inc_local = inc_global = inc_weak = true;
1198 if (!inc_def && !inc_undef && !inc_abs && !inc_common)
1199 inc_def = inc_undef = inc_abs = inc_common = true;
1200
1201 /* backwards compat for defined/undefined short hand */
1202 } else if (*this_sym == '+') {
1203 inc_undef = false;
1204 ++this_sym;
1205 } else if (*this_sym == '-') {
1206 inc_def = inc_abs = inc_common = false;
1207 ++this_sym;
1208 }
1209
1210 /* filter symbols */
1211 if ((!inc_notype && stt == STT_NOTYPE) || \
1212 (!inc_object && stt == STT_OBJECT) || \
1213 (!inc_func && stt == STT_FUNC ) || \
1214 (!inc_file && stt == STT_FILE ) || \
1215 (!inc_local && stb == STB_LOCAL ) || \
1216 (!inc_global && stb == STB_GLOBAL) || \
1217 (!inc_weak && stb == STB_WEAK ) || \
1218 (!inc_def && shn && shn < SHN_LORESERVE) || \
1219 (!inc_undef && shn == SHN_UNDEF ) || \
1220 (!inc_abs && shn == SHN_ABS ) || \
1221 (!inc_common && shn == SHN_COMMON))
1222 continue;
1223
1224 if (*this_sym == '*') {
1225 /* a "*" symbol gets you debug output */
1226 printf("%s(%s) %5lX %15s %15s %15s %s\n",
1227 ((*found_sym == 0) ? "\n\t" : "\t"),
1228 elf->base_filename,
1229 size,
1230 get_elfstttype(stt),
1231 get_elfstbtype(stb),
1232 get_elfshntype(shn),
1233 symname);
1234 goto matched;
1235
1236 } else {
1237 if (g_match) {
1238 /* regex match the symbol */
1239 if (rematch(this_sym, symname, REG_EXTENDED) != 0)
1240 continue;
1241
1242 } else if (*this_sym) {
1243 /* give empty symbols a "pass", else do a normal compare */
1244 const size_t len = strlen(this_sym);
1245 if (!(strncmp(this_sym, symname, len) == 0 &&
1246 /* Accept unversioned symbol names */
1247 (symname[len] == '\0' || symname[len] == '@')))
1248 continue;
1249 }
1250
1251 if (be_semi_verbose) {
1252 char buf[1024];
1253 snprintf(buf, sizeof(buf), "%lX %s %s",
1254 size,
1255 get_elfstttype(stt),
1256 this_sym);
1257 *ret = xstrdup(buf);
1258 } else {
1259 if (*ret) xchrcat(ret, ',', ret_len);
1260 xstrcat(ret, symname, ret_len);
1261 }
1262
1263 goto matched;
1264 }
1265 } while (next_sym);
1266
1267 return;
1268
1269 matched:
1270 *found_sym = 1;
1271 if (next_sym)
1272 next_sym[-1] = saved;
1273 }
1274
1275 static const char *scanelf_file_sym(elfobj *elf, char *found_sym)
1276 {
1277 char *ret;
1278 void *symtab_void, *strtab_void;
1279
1280 if (!find_sym) return NULL;
1281 ret = NULL;
1282
1283 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
1284
1285 if (symtab_void && strtab_void) {
1286 #define FIND_SYM(B) \
1287 if (elf->elf_class == ELFCLASS ## B) { \
1288 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
1289 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
1290 Elf ## B ## _Sym *sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
1291 Elf ## B ## _Word i, cnt = EGET(symtab->sh_entsize); \
1292 char *symname; \
1293 size_t ret_len = 0; \
1294 if (cnt) \
1295 cnt = EGET(symtab->sh_size) / cnt; \
1296 for (i = 0; i < cnt; ++i) { \
1297 if ((void*)sym > elf->data_end) { \
1298 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1299 goto break_out; \
1300 } \
1301 if (sym->st_name) { \
1302 /* make sure the symbol name is in acceptable memory range */ \
1303 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
1304 if ((void*)symname > elf->data_end) { \
1305 warnf("%s: corrupt ELF symbols", elf->filename); \
1306 ++sym; \
1307 continue; \
1308 } \
1309 scanelf_match_symname(elf, found_sym, \
1310 &ret, &ret_len, symname, \
1311 ELF##B##_ST_TYPE(EGET(sym->st_info)), \
1312 ELF##B##_ST_BIND(EGET(sym->st_info)), \
1313 EGET(sym->st_shndx), \
1314 /* st_size can be 64bit, but no one is really that big, so screw em */ \
1315 EGET(sym->st_size)); \
1316 } \
1317 ++sym; \
1318 } \
1319 }
1320 FIND_SYM(32)
1321 FIND_SYM(64)
1322 }
1323
1324 break_out:
1325 if (be_wewy_wewy_quiet) return NULL;
1326
1327 if (*find_sym != '*' && *found_sym)
1328 return ret;
1329 if (be_quiet)
1330 return NULL;
1331 else
1332 return " - ";
1333 }
1334
1335 static const char *scanelf_file_sections(elfobj *elf, char *found_section)
1336 {
1337 if (!find_section)
1338 return NULL;
1339
1340 #define FIND_SECTION(B) \
1341 if (elf->elf_class == ELFCLASS ## B) { \
1342 size_t matched, n; \
1343 int invert; \
1344 const char *section_name; \
1345 Elf ## B ## _Shdr *section; \
1346 \
1347 matched = 0; \
1348 array_for_each(find_section_arr, n, section_name) { \
1349 invert = (*section_name == '!' ? 1 : 0); \
1350 section = SHDR ## B (elf_findsecbyname(elf, section_name + invert)); \
1351 if ((section == NULL && invert) || (section != NULL && !invert)) \
1352 ++matched; \
1353 } \
1354 \
1355 if (matched == array_cnt(find_section_arr)) \
1356 *found_section = 1; \
1357 }
1358 FIND_SECTION(32)
1359 FIND_SECTION(64)
1360
1361 if (be_wewy_wewy_quiet)
1362 return NULL;
1363
1364 if (*found_section)
1365 return find_section;
1366
1367 if (be_quiet)
1368 return NULL;
1369 else
1370 return " - ";
1371 }
1372
1373 /* scan an elf file and show all the fun stuff */
1374 #define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
1375 static int scanelf_elfobj(elfobj *elf)
1376 {
1377 unsigned long i;
1378 char found_pax, found_phdr, found_relro, found_load, found_textrel,
1379 found_rpath, found_needed, found_interp, found_bind, found_soname,
1380 found_sym, found_lib, found_file, found_textrels, found_section;
1381 static char *out_buffer = NULL;
1382 static size_t out_len;
1383
1384 found_pax = found_phdr = found_relro = found_load = found_textrel = \
1385 found_rpath = found_needed = found_interp = found_bind = found_soname = \
1386 found_sym = found_lib = found_file = found_textrels = found_section = 0;
1387
1388 if (be_verbose > 2)
1389 printf("%s: scanning file {%s,%s}\n", elf->filename,
1390 get_elfeitype(EI_CLASS, elf->elf_class),
1391 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
1392 else if (be_verbose > 1)
1393 printf("%s: scanning file\n", elf->filename);
1394
1395 /* init output buffer */
1396 if (!out_buffer) {
1397 out_len = sizeof(char) * 80;
1398 out_buffer = xmalloc(out_len);
1399 }
1400 *out_buffer = '\0';
1401
1402 /* show the header */
1403 if (!be_quiet && show_banner) {
1404 for (i = 0; out_format[i]; ++i) {
1405 if (!IS_MODIFIER(out_format[i])) continue;
1406
1407 switch (out_format[++i]) {
1408 case '+': break;
1409 case '%': break;
1410 case '#': break;
1411 case 'F':
1412 case 'p':
1413 case 'f': prints("FILE "); found_file = 1; break;
1414 case 'o': prints(" TYPE "); break;
1415 case 'x': prints(" PAX "); break;
1416 case 'e': prints("STK/REL/PTL "); break;
1417 case 't': prints("TEXTREL "); break;
1418 case 'r': prints("RPATH "); break;
1419 case 'M': prints("CLASS "); break;
1420 case 'n': prints("NEEDED "); break;
1421 case 'i': prints("INTERP "); break;
1422 case 'b': prints("BIND "); break;
1423 case 'Z': prints("SIZE "); break;
1424 case 'S': prints("SONAME "); break;
1425 case 's': prints("SYM "); break;
1426 case 'N': prints("LIB "); break;
1427 case 'T': prints("TEXTRELS "); break;
1428 case 'k': prints("SECTION "); break;
1429 case 'a': prints("ARCH "); break;
1430 case 'I': prints("OSABI "); break;
1431 case 'Y': prints("EABI "); break;
1432 case 'O': prints("PERM "); break;
1433 case 'D': prints("ENDIAN "); break;
1434 default: warnf("'%c' has no title ?", out_format[i]);
1435 }
1436 }
1437 if (!found_file) prints("FILE ");
1438 prints("\n");
1439 found_file = 0;
1440 show_banner = 0;
1441 }
1442
1443 /* dump all the good stuff */
1444 for (i = 0; out_format[i]; ++i) {
1445 const char *out;
1446 const char *tmp;
1447 static char ubuf[sizeof(unsigned long)*2];
1448 if (!IS_MODIFIER(out_format[i])) {
1449 xchrcat(&out_buffer, out_format[i], &out_len);
1450 continue;
1451 }
1452
1453 out = NULL;
1454 be_wewy_wewy_quiet = (out_format[i] == '#');
1455 be_semi_verbose = (out_format[i] == '+');
1456 switch (out_format[++i]) {
1457 case '+':
1458 case '%':
1459 case '#':
1460 xchrcat(&out_buffer, out_format[i], &out_len); break;
1461 case 'F':
1462 found_file = 1;
1463 if (be_wewy_wewy_quiet) break;
1464 xstrcat(&out_buffer, elf->filename, &out_len);
1465 break;
1466 case 'p':
1467 found_file = 1;
1468 if (be_wewy_wewy_quiet) break;
1469 tmp = elf->filename;
1470 if (search_path) {
1471 ssize_t len_search = strlen(search_path);
1472 ssize_t len_file = strlen(elf->filename);
1473 if (!strncmp(elf->filename, search_path, len_search) && \
1474 len_file > len_search)
1475 tmp += len_search;
1476 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1477 }
1478 xstrcat(&out_buffer, tmp, &out_len);
1479 break;
1480 case 'f':
1481 found_file = 1;
1482 if (be_wewy_wewy_quiet) break;
1483 tmp = strrchr(elf->filename, '/');
1484 tmp = (tmp == NULL ? elf->filename : tmp+1);
1485 xstrcat(&out_buffer, tmp, &out_len);
1486 break;
1487 case 'o': out = get_elfetype(elf); break;
1488 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
1489 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
1490 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1491 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
1492 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1493 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1494 case 'D': out = get_endian(elf); break;
1495 case 'O': out = strfileperms(elf->filename); break;
1496 case 'n':
1497 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
1498 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1499 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1500 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
1501 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1502 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1503 case 'a': out = get_elfemtype(elf); break;
1504 case 'I': out = get_elfosabi(elf); break;
1505 case 'Y': out = get_elf_eabi(elf); break;
1506 case 'Z': snprintf(ubuf, sizeof(ubuf), "%lu", (unsigned long)elf->len); out = ubuf; break;;
1507 default: warnf("'%c' has no scan code?", out_format[i]);
1508 }
1509 if (out)
1510 xstrcat(&out_buffer, out, &out_len);
1511 }
1512
1513 #define FOUND_SOMETHING() \
1514 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1515 found_rpath || found_needed || found_interp || found_bind || \
1516 found_soname || found_sym || found_lib || found_textrels || found_section )
1517
1518 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1519 xchrcat(&out_buffer, ' ', &out_len);
1520 xstrcat(&out_buffer, elf->filename, &out_len);
1521 }
1522 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
1523 puts(out_buffer);
1524 fflush(stdout);
1525 }
1526
1527 return 0;
1528 }
1529
1530 /* scan a single elf */
1531 static int scanelf_elf(const char *filename, int fd, size_t len)
1532 {
1533 int ret = 1;
1534 elfobj *elf;
1535
1536 /* verify this is real ELF */
1537 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1538 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1539 return 2;
1540 }
1541 switch (match_bits) {
1542 case 32:
1543 if (elf->elf_class != ELFCLASS32)
1544 goto label_done;
1545 break;
1546 case 64:
1547 if (elf->elf_class != ELFCLASS64)
1548 goto label_done;
1549 break;
1550 default: break;
1551 }
1552 if (match_etypes) {
1553 char sbuf[126];
1554 strncpy(sbuf, match_etypes, sizeof(sbuf));
1555 if (strchr(match_etypes, ',') != NULL) {
1556 char *p;
1557 while ((p = strrchr(sbuf, ',')) != NULL) {
1558 *p = 0;
1559 if (etype_lookup(p+1) == get_etype(elf))
1560 goto label_ret;
1561 }
1562 }
1563 if (etype_lookup(sbuf) != get_etype(elf))
1564 goto label_done;
1565 }
1566
1567 label_ret:
1568 ret = scanelf_elfobj(elf);
1569
1570 label_done:
1571 unreadelf(elf);
1572 return ret;
1573 }
1574
1575 /* scan an archive of elfs */
1576 static int scanelf_archive(const char *filename, int fd, size_t len)
1577 {
1578 archive_handle *ar;
1579 archive_member *m;
1580 char *ar_buffer;
1581 elfobj *elf;
1582
1583 ar = ar_open_fd(filename, fd);
1584 if (ar == NULL)
1585 return 1;
1586
1587 ar_buffer = mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1588 while ((m = ar_next(ar)) != NULL) {
1589 off_t cur_pos = lseek(fd, 0, SEEK_CUR);
1590 if (cur_pos == -1)
1591 errp("lseek() failed");
1592 elf = readelf_buffer(m->name, ar_buffer + cur_pos, m->size);
1593 if (elf) {
1594 scanelf_elfobj(elf);
1595 unreadelf(elf);
1596 }
1597 }
1598 munmap(ar_buffer, len);
1599
1600 return 0;
1601 }
1602 /* scan a file which may be an elf or an archive or some other magical beast */
1603 static int scanelf_fileat(int dir_fd, const char *filename, const struct stat *st_cache)
1604 {
1605 const struct stat *st = st_cache;
1606 struct stat symlink_st;
1607 int fd;
1608
1609 /* always handle regular files and handle symlinked files if no -y */
1610 if (S_ISLNK(st->st_mode)) {
1611 if (!scan_symlink)
1612 return 1;
1613 fstatat(dir_fd, filename, &symlink_st, 0);
1614 st = &symlink_st;
1615 }
1616
1617 if (!S_ISREG(st->st_mode)) {
1618 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1619 return 1;
1620 }
1621
1622 if (match_perms) {
1623 if ((st->st_mode | match_perms) != st->st_mode)
1624 return 1;
1625 }
1626 fd = openat(dir_fd, filename, (fix_elf ? O_RDWR : O_RDONLY) | O_CLOEXEC);
1627 if (fd == -1)
1628 return 1;
1629
1630 if (scanelf_elf(filename, fd, st->st_size) == 2) {
1631 /* if it isn't an ELF, maybe it's an .a archive */
1632 if (scan_archives)
1633 scanelf_archive(filename, fd, st->st_size);
1634
1635 /*
1636 * unreadelf() implicitly closes its fd, so only close it
1637 * when we are returning it in the non-ELF case
1638 */
1639 close(fd);
1640 }
1641
1642 return 0;
1643 }
1644
1645 /* scan a directory for ET_EXEC files and print when we find one */
1646 static int scanelf_dirat(int dir_fd, const char *path)
1647 {
1648 register DIR *dir;
1649 register struct dirent *dentry;
1650 struct stat st_top, st;
1651 char buf[__PAX_UTILS_PATH_MAX], *subpath;
1652 size_t pathlen = 0, len = 0;
1653 int ret = 0;
1654 int subdir_fd;
1655
1656 /* make sure path exists */
1657 if (fstatat(dir_fd, path, &st_top, AT_SYMLINK_NOFOLLOW) == -1) {
1658 if (be_verbose > 2) printf("%s: does not exist\n", path);
1659 return 1;
1660 }
1661
1662 /* ok, if it isn't a directory, assume we can open it */
1663 if (!S_ISDIR(st_top.st_mode))
1664 return scanelf_fileat(dir_fd, path, &st_top);
1665
1666 /* now scan the dir looking for fun stuff */
1667 subdir_fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
1668 if (subdir_fd == -1)
1669 dir = NULL;
1670 else
1671 dir = fdopendir(subdir_fd);
1672 if (dir == NULL) {
1673 if (subdir_fd != -1)
1674 close(subdir_fd);
1675 warnf("could not opendir %s: %s", path, strerror(errno));
1676 return 1;
1677 }
1678 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1679
1680 subpath = stpcpy(buf, path);
1681 *subpath++ = '/';
1682 pathlen = subpath - buf;
1683 while ((dentry = readdir(dir))) {
1684 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1685 continue;
1686
1687 if (fstatat(subdir_fd, dentry->d_name, &st, AT_SYMLINK_NOFOLLOW) == -1)
1688 continue;
1689
1690 len = strlen(dentry->d_name);
1691 if (len + pathlen + 1 >= sizeof(buf)) {
1692 warnf("Skipping '%s%s': len > sizeof(buf); %zu > %zu\n",
1693 path, dentry->d_name, len + pathlen + 1, sizeof(buf));
1694 continue;
1695 }
1696 memcpy(subpath, dentry->d_name, len);
1697 subpath[len] = '\0';
1698
1699 if (S_ISREG(st.st_mode))
1700 ret = scanelf_fileat(dir_fd, buf, &st);
1701 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1702 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1703 ret = scanelf_dirat(dir_fd, buf);
1704 }
1705 }
1706 closedir(dir);
1707
1708 return ret;
1709 }
1710 static int scanelf_dir(const char *path)
1711 {
1712 return scanelf_dirat(root_fd, root_rel_path(path));
1713 }
1714
1715 static int scanelf_from_file(const char *filename)
1716 {
1717 FILE *fp;
1718 char *p, *path;
1719 size_t len;
1720 int ret;
1721
1722 if (strcmp(filename, "-") == 0)
1723 fp = stdin;
1724 else if ((fp = fopen(filename, "r")) == NULL)
1725 return 1;
1726
1727 path = NULL;
1728 len = 0;
1729 ret = 0;
1730 while (getline(&path, &len, fp) != -1) {
1731 if ((p = strchr(path, '\n')) != NULL)
1732 *p = 0;
1733 search_path = path;
1734 ret = scanelf_dir(path);
1735 }
1736 free(path);
1737
1738 if (fp != stdin)
1739 fclose(fp);
1740
1741 return ret;
1742 }
1743
1744 #if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1745
1746 static int load_ld_cache_config(int i, const char *fname)
1747 {
1748 FILE *fp = NULL;
1749 char *p, *path;
1750 size_t len;
1751 int curr_fd = -1;
1752
1753 fp = fopenat_r(root_fd, root_rel_path(fname));
1754 if (fp == NULL)
1755 return i;
1756
1757 path = NULL;
1758 len = 0;
1759 while (getline(&path, &len, fp) != -1) {
1760 if ((p = strrchr(path, '\r')) != NULL)
1761 *p = 0;
1762 if ((p = strchr(path, '\n')) != NULL)
1763 *p = 0;
1764
1765 /* recursive includes of the same file will make this segfault. */
1766 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1767 glob_t gl;
1768 size_t x;
1769 const char *gpath;
1770
1771 /* re-use existing path buffer ... need to be creative */
1772 if (path[8] != '/')
1773 gpath = memcpy(path + 3, "/etc/", 5);
1774 else
1775 gpath = path + 8;
1776 if (root_fd != AT_FDCWD) {
1777 if (curr_fd == -1) {
1778 curr_fd = open(".", O_RDONLY|O_CLOEXEC);
1779 if (fchdir(root_fd))
1780 errp("unable to change to root dir");
1781 }
1782 gpath = root_rel_path(gpath);
1783 }
1784
1785 if (glob(gpath, 0, NULL, &gl) == 0) {
1786 for (x = 0; x < gl.gl_pathc; ++x) {
1787 /* try to avoid direct loops */
1788 if (strcmp(gl.gl_pathv[x], fname) == 0)
1789 continue;
1790 i = load_ld_cache_config(i, gl.gl_pathv[x]);
1791 }
1792 globfree(&gl);
1793 }
1794
1795 /* failed globs are ignored by glibc */
1796 continue;
1797 }
1798
1799 if (*path != '/')
1800 continue;
1801
1802 xarraypush_str(ldpaths, path);
1803 }
1804 free(path);
1805
1806 fclose(fp);
1807
1808 if (curr_fd != -1) {
1809 if (fchdir(curr_fd))
1810 /* don't care */;
1811 close(curr_fd);
1812 }
1813
1814 return i;
1815 }
1816
1817 #elif defined(__FreeBSD__) || defined(__DragonFly__)
1818
1819 static int load_ld_cache_config(int i, const char *fname)
1820 {
1821 FILE *fp = NULL;
1822 char *b = NULL, *p;
1823 struct elfhints_hdr hdr;
1824
1825 fp = fopenat_r(root_fd, root_rel_path(fname));
1826 if (fp == NULL)
1827 return i;
1828
1829 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1830 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1831 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1832 {
1833 fclose(fp);
1834 return i;
1835 }
1836
1837 b = xmalloc(hdr.dirlistlen + 1);
1838 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1839 fclose(fp);
1840 free(b);
1841 return i;
1842 }
1843
1844 while ((p = strsep(&b, ":"))) {
1845 if (*p == '\0')
1846 continue;
1847 xarraypush_str(ldpaths, p);
1848 }
1849
1850 free(b);
1851 fclose(fp);
1852 return i;
1853 }
1854
1855 #else
1856 #ifdef __ELF__
1857 #warning Cache config support not implemented for your target
1858 #endif
1859 static int load_ld_cache_config(int i, const char *fname)
1860 {
1861 return 0;
1862 }
1863 #endif
1864
1865 /* scan /etc/ld.so.conf for paths */
1866 static void scanelf_ldpath(void)
1867 {
1868 char scan_l, scan_ul, scan_ull;
1869 size_t n;
1870 const char *ldpath;
1871 int i = 0;
1872
1873 if (array_cnt(ldpaths) == 0)
1874 err("Unable to load any paths from ld.so.conf");
1875
1876 scan_l = scan_ul = scan_ull = 0;
1877
1878 array_for_each(ldpaths, n, ldpath) {
1879 if (!scan_l && !strcmp(ldpath, "/lib")) scan_l = 1;
1880 if (!scan_ul && !strcmp(ldpath, "/usr/lib")) scan_ul = 1;
1881 if (!scan_ull && !strcmp(ldpath, "/usr/local/lib")) scan_ull = 1;
1882 scanelf_dir(ldpath);
1883 ++i;
1884 }
1885
1886 if (!scan_l) scanelf_dir("/lib");
1887 if (!scan_ul) scanelf_dir("/usr/lib");
1888 if (!scan_ull) scanelf_dir("/usr/local/lib");
1889 }
1890
1891 /* scan env PATH for paths */
1892 static void scanelf_envpath(void)
1893 {
1894 char *path, *p;
1895
1896 path = getenv("PATH");
1897 if (!path)
1898 err("PATH is not set in your env !");
1899 path = xstrdup(path);
1900
1901 while ((p = strrchr(path, ':')) != NULL) {
1902 scanelf_dir(p + 1);
1903 *p = 0;
1904 }
1905
1906 free(path);
1907 }
1908
1909 /* usage / invocation handling functions */ /* Free Flags: c d j u w G H J K P Q U W */
1910 #define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZCBhV"
1911 #define a_argument required_argument
1912 static struct option const long_opts[] = {
1913 {"path", no_argument, NULL, 'p'},
1914 {"ldpath", no_argument, NULL, 'l'},
1915 {"root", a_argument, NULL, 128},
1916 {"recursive", no_argument, NULL, 'R'},
1917 {"mount", no_argument, NULL, 'm'},
1918 {"symlink", no_argument, NULL, 'y'},
1919 {"archives", no_argument, NULL, 'A'},
1920 {"ldcache", no_argument, NULL, 'L'},
1921 {"fix", no_argument, NULL, 'X'},
1922 {"setpax", a_argument, NULL, 'z'},
1923 {"pax", no_argument, NULL, 'x'},
1924 {"header", no_argument, NULL, 'e'},
1925 {"textrel", no_argument, NULL, 't'},
1926 {"rpath", no_argument, NULL, 'r'},
1927 {"needed", no_argument, NULL, 'n'},
1928 {"interp", no_argument, NULL, 'i'},
1929 {"bind", no_argument, NULL, 'b'},
1930 {"soname", no_argument, NULL, 'S'},
1931 {"symbol", a_argument, NULL, 's'},
1932 {"section", a_argument, NULL, 'k'},
1933 {"lib", a_argument, NULL, 'N'},
1934 {"gmatch", no_argument, NULL, 'g'},
1935 {"textrels", no_argument, NULL, 'T'},
1936 {"etype", a_argument, NULL, 'E'},
1937 {"bits", a_argument, NULL, 'M'},
1938 {"endian", no_argument, NULL, 'D'},
1939 {"osabi", no_argument, NULL, 'I'},
1940 {"eabi", no_argument, NULL, 'Y'},
1941 {"perms", a_argument, NULL, 'O'},
1942 {"size", no_argument, NULL, 'Z'},
1943 {"all", no_argument, NULL, 'a'},
1944 {"quiet", no_argument, NULL, 'q'},
1945 {"verbose", no_argument, NULL, 'v'},
1946 {"format", a_argument, NULL, 'F'},
1947 {"from", a_argument, NULL, 'f'},
1948 {"file", a_argument, NULL, 'o'},
1949 {"nocolor", no_argument, NULL, 'C'},
1950 {"nobanner", no_argument, NULL, 'B'},
1951 {"help", no_argument, NULL, 'h'},
1952 {"version", no_argument, NULL, 'V'},
1953 {NULL, no_argument, NULL, 0x0}
1954 };
1955
1956 static const char * const opts_help[] = {
1957 "Scan all directories in PATH environment",
1958 "Scan all directories in /etc/ld.so.conf",
1959 "Root directory (use with -l or -p)",
1960 "Scan directories recursively",
1961 "Don't recursively cross mount points",
1962 "Don't scan symlinks",
1963 "Scan archives (.a files)",
1964 "Utilize ld.so.cache information (use with -r/-n)",
1965 "Try and 'fix' bad things (use with -r/-e)",
1966 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1967 "Print PaX markings",
1968 "Print GNU_STACK/PT_LOAD markings",
1969 "Print TEXTREL information",
1970 "Print RPATH information",
1971 "Print NEEDED information",
1972 "Print INTERP information",
1973 "Print BIND information",
1974 "Print SONAME information",
1975 "Find a specified symbol",
1976 "Find a specified section",
1977 "Find a specified library",
1978 "Use regex matching rather than string compare (use with -s)",
1979 "Locate cause of TEXTREL",
1980 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1981 "Print only ELF files matching numeric bits",
1982 "Print Endianness",
1983 "Print OSABI",
1984 "Print EABI (EM_ARM Only)",
1985 "Print only ELF files matching octal permissions",
1986 "Print ELF file size",
1987 "Print all useful/simple info\n",
1988 "Only output 'bad' things",
1989 "Be verbose (can be specified more than once)",
1990 "Use specified format for output",
1991 "Read input stream from a filename",
1992 "Write output stream to a filename",
1993 "Don't emit color in output",
1994 "Don't display the header",
1995 "Print this help and exit",
1996 "Print version and exit",
1997 NULL
1998 };
1999
2000 /* display usage and exit */
2001 static void usage(int status)
2002 {
2003 unsigned long i;
2004 printf("* Scan ELF binaries for stuff\n\n"
2005 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
2006 printf("Options: -[%s]\n", PARSE_FLAGS);
2007 for (i = 0; long_opts[i].name; ++i)
2008 if (long_opts[i].has_arg == no_argument)
2009 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
2010 long_opts[i].name, opts_help[i]);
2011 else if (long_opts[i].val > '~')
2012 printf(" --%-7s <arg> * %s\n",
2013 long_opts[i].name, opts_help[i]);
2014 else
2015 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
2016 long_opts[i].name, opts_help[i]);
2017
2018 puts("\nFor more information, see the scanelf(1) manpage");
2019 exit(status);
2020 }
2021
2022 /* parse command line arguments and preform needed actions */
2023 #define do_pax_state(option, flag) \
2024 if (islower(option)) { \
2025 flags &= ~PF_##flag; \
2026 flags |= PF_NO##flag; \
2027 } else { \
2028 flags &= ~PF_NO##flag; \
2029 flags |= PF_##flag; \
2030 }
2031 static int parseargs(int argc, char *argv[])
2032 {
2033 int i;
2034 const char *from_file = NULL;
2035 int ret = 0;
2036
2037 opterr = 0;
2038 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
2039 switch (i) {
2040
2041 case 'V':
2042 printf("pax-utils-%s: %s compiled %s\n%s\n"
2043 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
2044 VERSION, __FILE__, __DATE__, rcsid, argv0);
2045 exit(EXIT_SUCCESS);
2046 break;
2047 case 'h': usage(EXIT_SUCCESS); break;
2048 case 'f':
2049 if (from_file) warn("You prob don't want to specify -f twice");
2050 from_file = optarg;
2051 break;
2052 case 'E':
2053 match_etypes = optarg;
2054 break;
2055 case 'M':
2056 match_bits = atoi(optarg);
2057 if (match_bits == 0) {
2058 if (strcmp(optarg, "ELFCLASS32") == 0)
2059 match_bits = 32;
2060 if (strcmp(optarg, "ELFCLASS64") == 0)
2061 match_bits = 64;
2062 }
2063 break;
2064 case 'O':
2065 if (sscanf(optarg, "%o", &match_perms) == -1)
2066 match_bits = 0;
2067 break;
2068 case 'o': {
2069 if (freopen(optarg, "w", stdout) == NULL)
2070 err("Could not open output stream '%s': %s", optarg, strerror(errno));
2071 break;
2072 }
2073 case 'k':
2074 xarraypush_str(find_section_arr, optarg);
2075 break;
2076 case 's': {
2077 if (find_sym) warn("You prob don't want to specify -s twice");
2078 find_sym = optarg;
2079 break;
2080 }
2081 case 'N':
2082 xarraypush_str(find_lib_arr, optarg);
2083 break;
2084 case 'F': {
2085 if (out_format) warn("You prob don't want to specify -F twice");
2086 out_format = optarg;
2087 break;
2088 }
2089 case 'z': {
2090 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
2091 size_t x;
2092
2093 for (x = 0; x < strlen(optarg); x++) {
2094 switch (optarg[x]) {
2095 case 'p':
2096 case 'P':
2097 do_pax_state(optarg[x], PAGEEXEC);
2098 break;
2099 case 's':
2100 case 'S':
2101 do_pax_state(optarg[x], SEGMEXEC);
2102 break;
2103 case 'm':
2104 case 'M':
2105 do_pax_state(optarg[x], MPROTECT);
2106 break;
2107 case 'e':
2108 case 'E':
2109 do_pax_state(optarg[x], EMUTRAMP);
2110 break;
2111 case 'r':
2112 case 'R':
2113 do_pax_state(optarg[x], RANDMMAP);
2114 break;
2115 case 'x':
2116 case 'X':
2117 do_pax_state(optarg[x], RANDEXEC);
2118 break;
2119 default:
2120 break;
2121 }
2122 }
2123 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
2124 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
2125 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
2126 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
2127 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
2128 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
2129 setpax = flags;
2130 break;
2131 }
2132 case 'Z': show_size = 1; break;
2133 case 'g': g_match = 1; break;
2134 case 'L': use_ldcache = 1; break;
2135 case 'y': scan_symlink = 0; break;
2136 case 'A': scan_archives = 1; break;
2137 case 'C': color_init(true); break;
2138 case 'B': show_banner = 0; break;
2139 case 'l': scan_ldpath = 1; break;
2140 case 'p': scan_envpath = 1; break;
2141 case 'R': dir_recurse = 1; break;
2142 case 'm': dir_crossmount = 0; break;
2143 case 'X': ++fix_elf; break;
2144 case 'x': show_pax = 1; break;
2145 case 'e': show_phdr = 1; break;
2146 case 't': show_textrel = 1; break;
2147 case 'r': show_rpath = 1; break;
2148 case 'n': show_needed = 1; break;
2149 case 'i': show_interp = 1; break;
2150 case 'b': show_bind = 1; break;
2151 case 'S': show_soname = 1; break;
2152 case 'T': show_textrels = 1; break;
2153 case 'q': be_quiet = 1; break;
2154 case 'v': be_verbose = (be_verbose % 20) + 1; break;
2155 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
2156 case 'D': show_endian = 1; break;
2157 case 'I': show_osabi = 1; break;
2158 case 'Y': show_eabi = 1; break;
2159 case 128:
2160 root_fd = open(optarg, O_RDONLY|O_CLOEXEC);
2161 if (root_fd == -1)
2162 err("Could not open root: %s", optarg);
2163 break;
2164 case ':':
2165 err("Option '%c' is missing parameter", optopt);
2166 case '?':
2167 err("Unknown option '%c' or argument missing", optopt);
2168 default:
2169 err("Unhandled option '%c'; please report this", i);
2170 }
2171 }
2172 if (show_textrels && be_verbose)
2173 has_objdump = bin_in_path("objdump");
2174 /* flatten arrays for display */
2175 if (array_cnt(find_lib_arr))
2176 find_lib = array_flatten_str(find_lib_arr);
2177 if (array_cnt(find_section_arr))
2178 find_section = array_flatten_str(find_section_arr);
2179 /* let the format option override all other options */
2180 if (out_format) {
2181 show_pax = show_phdr = show_textrel = show_rpath = \
2182 show_needed = show_interp = show_bind = show_soname = \
2183 show_textrels = show_perms = show_endian = show_size = \
2184 show_osabi = show_eabi = 0;
2185 for (i = 0; out_format[i]; ++i) {
2186 if (!IS_MODIFIER(out_format[i])) continue;
2187
2188 switch (out_format[++i]) {
2189 case '+': break;
2190 case '%': break;
2191 case '#': break;
2192 case 'F': break;
2193 case 'p': break;
2194 case 'f': break;
2195 case 'k': break;
2196 case 's': break;
2197 case 'N': break;
2198 case 'o': break;
2199 case 'a': break;
2200 case 'M': break;
2201 case 'Z': show_size = 1; break;
2202 case 'D': show_endian = 1; break;
2203 case 'I': show_osabi = 1; break;
2204 case 'Y': show_eabi = 1; break;
2205 case 'O': show_perms = 1; break;
2206 case 'x': show_pax = 1; break;
2207 case 'e': show_phdr = 1; break;
2208 case 't': show_textrel = 1; break;
2209 case 'r': show_rpath = 1; break;
2210 case 'n': show_needed = 1; break;
2211 case 'i': show_interp = 1; break;
2212 case 'b': show_bind = 1; break;
2213 case 'S': show_soname = 1; break;
2214 case 'T': show_textrels = 1; break;
2215 default:
2216 err("Invalid format specifier '%c' (byte %i)",
2217 out_format[i], i+1);
2218 }
2219 }
2220
2221 /* construct our default format */
2222 } else {
2223 size_t fmt_len = 30;
2224 out_format = xmalloc(sizeof(char) * fmt_len);
2225 *out_format = '\0';
2226 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
2227 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
2228 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
2229 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
2230 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
2231 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
2232 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
2233 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
2234 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
2235 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
2236 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
2237 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
2238 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
2239 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
2240 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
2241 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
2242 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
2243 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
2244 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
2245 }
2246 if (be_verbose > 2) printf("Format: %s\n", out_format);
2247
2248 /* now lets actually do the scanning */
2249 if (scan_ldpath || use_ldcache)
2250 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
2251 if (scan_ldpath) scanelf_ldpath();
2252 if (scan_envpath) scanelf_envpath();
2253 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
2254 from_file = "-";
2255 if (from_file) {
2256 scanelf_from_file(from_file);
2257 from_file = *argv;
2258 }
2259 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
2260 err("Nothing to scan !?");
2261 while (optind < argc) {
2262 search_path = argv[optind++];
2263 ret = scanelf_dir(search_path);
2264 }
2265
2266 /* clean up */
2267 xarrayfree(ldpaths);
2268 xarrayfree(find_lib_arr);
2269 xarrayfree(find_section_arr);
2270 free(find_lib);
2271 free(find_section);
2272
2273 if (ldcache != 0)
2274 munmap(ldcache, ldcache_size);
2275 return ret;
2276 }
2277
2278 static char **get_split_env(const char *envvar)
2279 {
2280 const char *delims = " \t\n";
2281 char **envvals = NULL;
2282 char *env, *s;
2283 int nentry;
2284
2285 if ((env = getenv(envvar)) == NULL)
2286 return NULL;
2287
2288 env = xstrdup(env);
2289 if (env == NULL)
2290 return NULL;
2291
2292 s = strtok(env, delims);
2293 if (s == NULL) {
2294 free(env);
2295 return NULL;
2296 }
2297
2298 nentry = 0;
2299 while (s != NULL) {
2300 ++nentry;
2301 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
2302 envvals[nentry-1] = s;
2303 s = strtok(NULL, delims);
2304 }
2305 envvals[nentry] = NULL;
2306
2307 /* don't want to free(env) as it contains the memory that backs
2308 * the envvals array of strings */
2309 return envvals;
2310 }
2311
2312 static void parseenv(void)
2313 {
2314 color_init(false);
2315 qa_textrels = get_split_env("QA_TEXTRELS");
2316 qa_execstack = get_split_env("QA_EXECSTACK");
2317 qa_wx_load = get_split_env("QA_WX_LOAD");
2318 }
2319
2320 #ifdef __PAX_UTILS_CLEANUP
2321 static void cleanup(void)
2322 {
2323 free(out_format);
2324 free(qa_textrels);
2325 free(qa_execstack);
2326 free(qa_wx_load);
2327 }
2328 #endif
2329
2330 int main(int argc, char *argv[])
2331 {
2332 int ret;
2333 if (argc < 2)
2334 usage(EXIT_FAILURE);
2335 parseenv();
2336 ret = parseargs(argc, argv);
2337 fclose(stdout);
2338 #ifdef __PAX_UTILS_CLEANUP
2339 cleanup();
2340 warn("The calls to add/delete heap should be off:\n"
2341 "\t- 1 due to the out_buffer not being freed in scanelf_fileat()\n"
2342 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
2343 #endif
2344 return ret;
2345 }
2346
2347 /* Match filename against entries in matchlist, return TRUE
2348 * if the file is listed */
2349 static int file_matches_list(const char *filename, char **matchlist)
2350 {
2351 char **file;
2352 char *match;
2353 char buf[__PAX_UTILS_PATH_MAX];
2354
2355 if (matchlist == NULL)
2356 return 0;
2357
2358 for (file = matchlist; *file != NULL; file++) {
2359 if (search_path) {
2360 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2361 match = buf;
2362 } else {
2363 match = *file;
2364 }
2365 if (fnmatch(match, filename, 0) == 0)
2366 return 1;
2367 }
2368 return 0;
2369 }

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