/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.121 - (show annotations) (download) (as text)
Sun Feb 5 17:10:52 2006 UTC (8 years, 7 months ago) by solar
Branch: MAIN
Changes since 1.120: +5 -2 lines
File MIME type: text/x-csrc
- print ELF e_types when -h flag is given. Add missing PT_NUM to paxelf.c. Document new -M feature.

1 /*
2 * Copyright 2003-2006 Gentoo Foundation
3 * Distributed under the terms of the GNU General Public License v2
4 * $Header: /var/cvsroot/gentoo-projects/pax-utils/scanelf.c,v 1.120 2006/02/05 03:01:30 solar Exp $
5 *
6 * Copyright 2003-2006 Ned Ludd - <solar@gentoo.org>
7 * Copyright 2004-2006 Mike Frysinger - <vapier@gentoo.org>
8 */
9
10 #include "paxinc.h"
11
12 static const char *rcsid = "$Id: scanelf.c,v 1.120 2006/02/05 03:01:30 solar Exp $";
13 #define argv0 "scanelf"
14
15 #define IS_MODIFIER(c) (c == '%' || c == '#')
16
17
18
19 /* prototypes */
20 static int scanelf_elfobj(elfobj *elf);
21 static int scanelf_elf(const char *filename, int fd, size_t len);
22 static int scanelf_archive(const char *filename, int fd, size_t len);
23 static void scanelf_file(const char *filename);
24 static void scanelf_dir(const char *path);
25 static void scanelf_ldpath(void);
26 static void scanelf_envpath(void);
27 static void usage(int status);
28 static void parseargs(int argc, char *argv[]);
29 static char *xstrdup(const char *s);
30 static void *xmalloc(size_t size);
31 static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n);
32 #define xstrcat(dst,src,curr_len) xstrncat(dst,src,curr_len,0)
33 static inline void xchrcat(char **dst, const char append, size_t *curr_len);
34
35 /* variables to control behavior */
36 static char match_etypes[126] = "";
37 static char *ldpaths[256];
38 static char scan_ldpath = 0;
39 static char scan_envpath = 0;
40 static char scan_symlink = 1;
41 static char scan_archives = 0;
42 static char dir_recurse = 0;
43 static char dir_crossmount = 1;
44 static char show_pax = 0;
45 static char show_phdr = 0;
46 static char show_textrel = 0;
47 static char show_rpath = 0;
48 static char show_needed = 0;
49 static char show_interp = 0;
50 static char show_bind = 0;
51 static char show_soname = 0;
52 static char show_textrels = 0;
53 static char show_banner = 1;
54 static char be_quiet = 0;
55 static char be_verbose = 0;
56 static char be_wewy_wewy_quiet = 0;
57 static char *find_sym = NULL, *versioned_symname = NULL;
58 static char *find_lib = NULL;
59 static char *out_format = NULL;
60 static char *search_path = NULL;
61 static char fix_elf = 0;
62 static char gmatch = 0;
63 static char use_ldcache = 0;
64
65 int match_bits = 0;
66 caddr_t ldcache = 0;
67 size_t ldcache_size = 0;
68
69 /* sub-funcs for scanelf_file() */
70 static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
71 {
72 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
73 #define GET_SYMTABS(B) \
74 if (elf->elf_class == ELFCLASS ## B) { \
75 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
76 /* debug sections */ \
77 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
78 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
79 /* runtime sections */ \
80 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
81 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
82 if (symtab && dynsym) { \
83 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \
84 } else { \
85 *sym = (void*)(symtab ? symtab : dynsym); \
86 } \
87 if (strtab && dynstr) { \
88 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \
89 } else { \
90 *tab = (void*)(strtab ? strtab : dynstr); \
91 } \
92 }
93 GET_SYMTABS(32)
94 GET_SYMTABS(64)
95 }
96 static char *scanelf_file_pax(elfobj *elf, char *found_pax)
97 {
98 static char ret[7];
99 unsigned long i, shown;
100
101 if (!show_pax) return NULL;
102
103 shown = 0;
104 memset(&ret, 0, sizeof(ret));
105
106 if (elf->phdr) {
107 #define SHOW_PAX(B) \
108 if (elf->elf_class == ELFCLASS ## B) { \
109 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
110 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
111 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
112 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
113 continue; \
114 if (be_quiet && (EGET(phdr[i].p_flags) == 10240)) \
115 continue; \
116 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
117 *found_pax = 1; \
118 ++shown; \
119 break; \
120 } \
121 }
122 SHOW_PAX(32)
123 SHOW_PAX(64)
124 }
125
126 /* fall back to EI_PAX if no PT_PAX was found */
127 if (!*ret) {
128 static char *paxflags;
129 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
130 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
131 *found_pax = 1;
132 return (be_wewy_wewy_quiet ? NULL : paxflags);
133 }
134 strncpy(ret, paxflags, sizeof(ret));
135 }
136
137 if (be_wewy_wewy_quiet || (be_quiet && !shown))
138 return NULL;
139 else
140 return ret;
141 }
142
143 static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
144 {
145 static char ret[12];
146 char *found;
147 unsigned long i, shown, multi_stack, multi_relro, multi_load;
148 int max_pt_load;
149
150 if (!show_phdr) return NULL;
151
152 memcpy(ret, "--- --- ---\0", 12);
153
154 shown = 0;
155 multi_stack = multi_relro = multi_load = 0;
156 max_pt_load = elf_max_pt_load(elf);
157
158 #define NOTE_GNU_STACK ".note.GNU-stack"
159 #define SHOW_PHDR(B) \
160 if (elf->elf_class == ELFCLASS ## B) { \
161 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
162 Elf ## B ## _Off offset; \
163 uint32_t flags, check_flags; \
164 if (elf->phdr != NULL) { \
165 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
166 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
167 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
168 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
169 found = found_phdr; \
170 offset = 0; \
171 check_flags = PF_X; \
172 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
173 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
174 found = found_relro; \
175 offset = 4; \
176 check_flags = PF_X; \
177 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
178 if (ehdr->e_type == ET_DYN || ehdr->e_type == ET_EXEC) \
179 if (multi_load++ > max_pt_load) warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
180 found = found_load; \
181 offset = 8; \
182 check_flags = PF_W|PF_X; \
183 } else \
184 continue; \
185 flags = EGET(phdr[i].p_flags); \
186 if (be_quiet && ((flags & check_flags) != check_flags)) \
187 continue; \
188 if (fix_elf && ((flags & PF_X) != flags)) { \
189 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
190 ret[3] = ret[7] = '!'; \
191 flags = EGET(phdr[i].p_flags); \
192 } \
193 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
194 *found = 1; \
195 ++shown; \
196 } \
197 } else if (elf->shdr != NULL) { \
198 /* no program headers which means this is prob an object file */ \
199 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
200 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
201 char *str; \
202 if ((void*)strtbl > (void*)elf->data_end) \
203 goto skip_this_shdr##B; \
204 check_flags = SHF_WRITE|SHF_EXECINSTR; \
205 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
206 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
207 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
208 str = elf->data + offset; \
209 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
210 if (!strcmp(str, NOTE_GNU_STACK)) { \
211 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
212 flags = EGET(shdr[i].sh_flags); \
213 if (be_quiet && ((flags & check_flags) != check_flags)) \
214 continue; \
215 ++*found_phdr; \
216 shown = 1; \
217 if (flags & SHF_WRITE) ret[0] = 'W'; \
218 if (flags & SHF_ALLOC) ret[1] = 'A'; \
219 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
220 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
221 break; \
222 } \
223 } \
224 skip_this_shdr##B: \
225 if (!multi_stack) { \
226 *found_phdr = 1; \
227 shown = 1; \
228 memcpy(ret, "!WX", 3); \
229 } \
230 } \
231 }
232 SHOW_PHDR(32)
233 SHOW_PHDR(64)
234
235 if (be_wewy_wewy_quiet || (be_quiet && !shown))
236 return NULL;
237 else
238 return ret;
239 }
240 static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
241 {
242 static const char *ret = "TEXTREL";
243 unsigned long i;
244
245 if (!show_textrel && !show_textrels) return NULL;
246
247 if (elf->phdr) {
248 #define SHOW_TEXTREL(B) \
249 if (elf->elf_class == ELFCLASS ## B) { \
250 Elf ## B ## _Dyn *dyn; \
251 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
252 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
253 Elf ## B ## _Off offset; \
254 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
255 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
256 offset = EGET(phdr[i].p_offset); \
257 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
258 dyn = DYN ## B (elf->data + offset); \
259 while (EGET(dyn->d_tag) != DT_NULL) { \
260 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
261 *found_textrel = 1; \
262 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
263 return (be_wewy_wewy_quiet ? NULL : ret); \
264 } \
265 ++dyn; \
266 } \
267 } }
268 SHOW_TEXTREL(32)
269 SHOW_TEXTREL(64)
270 }
271
272 if (be_quiet || be_wewy_wewy_quiet)
273 return NULL;
274 else
275 return " - ";
276 }
277 static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
278 {
279 unsigned long s, r, rmax;
280 void *symtab_void, *strtab_void, *text_void;
281
282 if (!show_textrels) return NULL;
283
284 /* don't search for TEXTREL's if the ELF doesn't have any */
285 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
286 if (!*found_textrel) return NULL;
287
288 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
289 text_void = elf_findsecbyname(elf, ".text");
290
291 if (symtab_void && strtab_void && text_void && elf->shdr) {
292 #define SHOW_TEXTRELS(B) \
293 if (elf->elf_class == ELFCLASS ## B) { \
294 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
295 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
296 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
297 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
298 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
299 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
300 uint ## B ## _t memsz = EGET(text->sh_size); \
301 Elf ## B ## _Rel *rel; \
302 Elf ## B ## _Rela *rela; \
303 /* search the section headers for relocations */ \
304 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
305 uint32_t sh_type = EGET(shdr[s].sh_type); \
306 if (sh_type == SHT_REL) { \
307 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \
308 rela = NULL; \
309 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
310 } else if (sh_type == SHT_RELA) { \
311 rel = NULL; \
312 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \
313 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
314 } else \
315 continue; \
316 /* now see if any of the relocs are in the .text */ \
317 for (r = 0; r < rmax; ++r) { \
318 unsigned long sym_max; \
319 Elf ## B ## _Addr offset_tmp; \
320 Elf ## B ## _Sym *func; \
321 Elf ## B ## _Sym *sym; \
322 Elf ## B ## _Addr r_offset; \
323 uint ## B ## _t r_info; \
324 if (sh_type == SHT_REL) { \
325 r_offset = EGET(rel[r].r_offset); \
326 r_info = EGET(rel[r].r_info); \
327 } else { \
328 r_offset = EGET(rela[r].r_offset); \
329 r_info = EGET(rela[r].r_info); \
330 } \
331 /* make sure this relocation is inside of the .text */ \
332 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
333 if (be_verbose <= 2) continue; \
334 } else \
335 *found_textrels = 1; \
336 /* locate this relocation symbol name */ \
337 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
338 if ((void*)sym > (void*)elf->data_end) { \
339 warn("%s: corrupt ELF symbol", elf->filename); \
340 continue; \
341 } \
342 sym_max = ELF ## B ## _R_SYM(r_info); \
343 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
344 sym += sym_max; \
345 else \
346 sym = NULL; \
347 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
348 /* show the raw details about this reloc */ \
349 printf(" %s: ", elf->base_filename); \
350 if (sym && sym->st_name) \
351 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \
352 else \
353 printf("(memory/fake?)"); \
354 printf(" [0x%lX]", (unsigned long)r_offset); \
355 /* now try to find the closest symbol that this rel is probably in */ \
356 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
357 func = NULL; \
358 offset_tmp = 0; \
359 while (sym_max--) { \
360 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
361 func = sym; \
362 offset_tmp = EGET(sym->st_value); \
363 } \
364 ++sym; \
365 } \
366 printf(" in "); \
367 if (func && func->st_name) \
368 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \
369 else \
370 printf("(NULL: fake?)"); \
371 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
372 } \
373 } }
374 SHOW_TEXTRELS(32)
375 SHOW_TEXTRELS(64)
376 }
377 if (!*found_textrels)
378 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
379
380 return NULL;
381 }
382
383 static void rpath_security_checks(elfobj *, char *, const char *);
384 static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
385 {
386 struct stat st;
387 switch (*item) {
388 case '/': break;
389 case '.':
390 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
391 break;
392 case ':':
393 case '\0':
394 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
395 break;
396 case '$':
397 if (fstat(elf->fd, &st) != -1)
398 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
399 warnf("Security problem with %s='%s' in %s with mode set of %o",
400 dt_type, item, elf->filename, st.st_mode & 07777);
401 break;
402 default:
403 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
404 break;
405 }
406 }
407 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
408 {
409 unsigned long i, s;
410 char *rpath, *runpath, **r;
411 void *strtbl_void;
412
413 if (!show_rpath) return;
414
415 strtbl_void = elf_findsecbyname(elf, ".dynstr");
416 rpath = runpath = NULL;
417
418 if (elf->phdr && strtbl_void) {
419 #define SHOW_RPATH(B) \
420 if (elf->elf_class == ELFCLASS ## B) { \
421 Elf ## B ## _Dyn *dyn; \
422 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
423 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
424 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
425 Elf ## B ## _Off offset; \
426 Elf ## B ## _Xword word; \
427 /* Scan all the program headers */ \
428 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
429 /* Just scan dynamic headers */ \
430 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
431 offset = EGET(phdr[i].p_offset); \
432 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
433 /* Just scan dynamic RPATH/RUNPATH headers */ \
434 dyn = DYN ## B (elf->data + offset); \
435 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
436 if (word == DT_RPATH) { \
437 r = &rpath; \
438 } else if (word == DT_RUNPATH) { \
439 r = &runpath; \
440 } else { \
441 ++dyn; \
442 continue; \
443 } \
444 /* Verify the memory is somewhat sane */ \
445 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
446 if (offset < (Elf ## B ## _Off)elf->len) { \
447 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
448 *r = (char*)(elf->data + offset); \
449 /* cache the length in case we need to nuke this section later on */ \
450 if (fix_elf) \
451 offset = strlen(*r); \
452 /* If quiet, don't output paths in ld.so.conf */ \
453 if (be_quiet) { \
454 size_t len; \
455 char *start, *end; \
456 /* note that we only 'chop' off leading known paths. */ \
457 /* since *r is read-only memory, we can only move the ptr forward. */ \
458 start = *r; \
459 /* scan each path in : delimited list */ \
460 while (start) { \
461 rpath_security_checks(elf, start, get_elfdtype(word)); \
462 end = strchr(start, ':'); \
463 len = (end ? abs(end - start) : strlen(start)); \
464 if (use_ldcache) \
465 for (s = 0; ldpaths[s]; ++s) \
466 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
467 *r = end; \
468 /* corner case ... if RPATH reads "/usr/lib:", we want \
469 * to show ':' rather than '' */ \
470 if (end && end[1] != '\0') \
471 (*r)++; \
472 break; \
473 } \
474 if (!*r || !end) \
475 break; \
476 else \
477 start = start + len + 1; \
478 } \
479 } \
480 if (*r) { \
481 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
482 /* just nuke it */ \
483 nuke_it##B: \
484 memset(*r, 0x00, offset); \
485 *r = NULL; \
486 ESET(dyn->d_tag, DT_DEBUG); \
487 ESET(dyn->d_un.d_ptr, 0); \
488 } else if (fix_elf) { \
489 /* try to clean "bad" paths */ \
490 size_t len, tmpdir_len; \
491 char *start, *end; \
492 const char *tmpdir; \
493 start = *r; \
494 tmpdir = (getenv("TMPDIR") ? : "."); \
495 tmpdir_len = strlen(tmpdir); \
496 while (1) { \
497 end = strchr(start, ':'); \
498 if (start == end) { \
499 eat_this_path##B: \
500 len = strlen(end); \
501 memmove(start, end+1, len); \
502 start[len-1] = '\0'; \
503 end = start - 1; \
504 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
505 if (!end) { \
506 if (start == *r) \
507 goto nuke_it##B; \
508 *--start = '\0'; \
509 } else \
510 goto eat_this_path##B; \
511 } \
512 if (!end) \
513 break; \
514 start = end + 1; \
515 } \
516 if (**r == '\0') \
517 goto nuke_it##B; \
518 } \
519 if (*r) \
520 *found_rpath = 1; \
521 } \
522 } \
523 ++dyn; \
524 } \
525 } }
526 SHOW_RPATH(32)
527 SHOW_RPATH(64)
528 }
529
530 if (be_wewy_wewy_quiet) return;
531
532 if (rpath && runpath) {
533 if (!strcmp(rpath, runpath)) {
534 xstrcat(ret, runpath, ret_len);
535 } else {
536 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
537 xchrcat(ret, '{', ret_len);
538 xstrcat(ret, rpath, ret_len);
539 xchrcat(ret, ',', ret_len);
540 xstrcat(ret, runpath, ret_len);
541 xchrcat(ret, '}', ret_len);
542 }
543 } else if (rpath || runpath)
544 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
545 else if (!be_quiet)
546 xstrcat(ret, " - ", ret_len);
547 }
548
549 #define LDSO_CACHE_MAGIC "ld.so-"
550 #define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
551 #define LDSO_CACHE_VER "1.7.0"
552 #define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
553 #define FLAG_ANY -1
554 #define FLAG_TYPE_MASK 0x00ff
555 #define FLAG_LIBC4 0x0000
556 #define FLAG_ELF 0x0001
557 #define FLAG_ELF_LIBC5 0x0002
558 #define FLAG_ELF_LIBC6 0x0003
559 #define FLAG_REQUIRED_MASK 0xff00
560 #define FLAG_SPARC_LIB64 0x0100
561 #define FLAG_IA64_LIB64 0x0200
562 #define FLAG_X8664_LIB64 0x0300
563 #define FLAG_S390_LIB64 0x0400
564 #define FLAG_POWERPC_LIB64 0x0500
565 #define FLAG_MIPS64_LIBN32 0x0600
566 #define FLAG_MIPS64_LIBN64 0x0700
567
568 static char *lookup_cache_lib(elfobj *, char *);
569 static char *lookup_cache_lib(elfobj *elf, char *fname)
570 {
571 int fd = 0;
572 char *strs;
573 static char buf[__PAX_UTILS_PATH_MAX] = "";
574 const char *cachefile = "/etc/ld.so.cache";
575 struct stat st;
576
577 typedef struct {
578 char magic[LDSO_CACHE_MAGIC_LEN];
579 char version[LDSO_CACHE_VER_LEN];
580 int nlibs;
581 } header_t;
582 header_t *header;
583
584 typedef struct {
585 int flags;
586 int sooffset;
587 int liboffset;
588 } libentry_t;
589 libentry_t *libent;
590
591 if (fname == NULL)
592 return NULL;
593
594 if (ldcache == 0) {
595 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1)
596 return NULL;
597
598 /* cache these values so we only map/unmap the cache file once */
599 ldcache_size = st.st_size;
600 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
601
602 close(fd);
603
604 if (ldcache == (caddr_t)-1) {
605 ldcache = 0;
606 return NULL;
607 }
608
609 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
610 return NULL;
611 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
612 return NULL;
613 }
614
615 header = (header_t *) ldcache;
616 libent = (libentry_t *) (ldcache + sizeof(header_t));
617 strs = (char *) &libent[header->nlibs];
618
619 for (fd = 0; fd < header->nlibs; fd++) {
620 /* this should be more fine grained, but for now we assume that
621 * diff arches will not be cached together. and we ignore the
622 * the different multilib mips cases. */
623 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
624 continue;
625 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
626 continue;
627
628 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
629 continue;
630 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
631 }
632 return buf;
633 }
634
635
636 static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
637 {
638 unsigned long i;
639 char *needed;
640 void *strtbl_void;
641 char *p;
642
643 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
644
645 strtbl_void = elf_findsecbyname(elf, ".dynstr");
646
647 if (elf->phdr && strtbl_void) {
648 #define SHOW_NEEDED(B) \
649 if (elf->elf_class == ELFCLASS ## B) { \
650 Elf ## B ## _Dyn *dyn; \
651 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
652 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
653 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
654 Elf ## B ## _Off offset; \
655 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
656 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
657 offset = EGET(phdr[i].p_offset); \
658 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
659 dyn = DYN ## B (elf->data + offset); \
660 while (EGET(dyn->d_tag) != DT_NULL) { \
661 if (EGET(dyn->d_tag) == DT_NEEDED) { \
662 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
663 if (offset >= (Elf ## B ## _Off)elf->len) { \
664 ++dyn; \
665 continue; \
666 } \
667 needed = (char*)(elf->data + offset); \
668 if (op == 0) { \
669 if (!be_wewy_wewy_quiet) { \
670 if (*found_needed) xchrcat(ret, ',', ret_len); \
671 if (use_ldcache) \
672 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
673 needed = p; \
674 xstrcat(ret, needed, ret_len); \
675 } \
676 *found_needed = 1; \
677 } else { \
678 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \
679 *found_lib = 1; \
680 return (be_wewy_wewy_quiet ? NULL : needed); \
681 } \
682 } \
683 } \
684 ++dyn; \
685 } \
686 } }
687 SHOW_NEEDED(32)
688 SHOW_NEEDED(64)
689 if (op == 0 && !*found_needed && be_verbose)
690 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
691 }
692
693 return NULL;
694 }
695 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
696 {
697 void *strtbl_void;
698
699 if (!show_interp) return NULL;
700
701 strtbl_void = elf_findsecbyname(elf, ".interp");
702
703 if (strtbl_void) {
704 #define SHOW_INTERP(B) \
705 if (elf->elf_class == ELFCLASS ## B) { \
706 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
707 *found_interp = 1; \
708 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
709 }
710 SHOW_INTERP(32)
711 SHOW_INTERP(64)
712 }
713 return NULL;
714 }
715 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
716 {
717 unsigned long i;
718 struct stat s;
719
720 if (!show_bind) return NULL;
721 if (!elf->phdr) return NULL;
722
723 #define SHOW_BIND(B) \
724 if (elf->elf_class == ELFCLASS ## B) { \
725 Elf ## B ## _Dyn *dyn; \
726 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
727 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
728 Elf ## B ## _Off offset; \
729 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
730 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
731 offset = EGET(phdr[i].p_offset); \
732 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
733 dyn = DYN ## B (elf->data + offset); \
734 while (EGET(dyn->d_tag) != DT_NULL) { \
735 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
736 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
737 { \
738 if (be_quiet) return NULL; \
739 *found_bind = 1; \
740 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
741 } \
742 ++dyn; \
743 } \
744 } \
745 }
746 SHOW_BIND(32)
747 SHOW_BIND(64)
748
749 if (be_wewy_wewy_quiet) return NULL;
750
751 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) {
752 return NULL;
753 } else {
754 *found_bind = 1;
755 return (char *) "LAZY";
756 }
757 }
758 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
759 {
760 unsigned long i;
761 char *soname;
762 void *strtbl_void;
763
764 if (!show_soname) return NULL;
765
766 strtbl_void = elf_findsecbyname(elf, ".dynstr");
767
768 if (elf->phdr && strtbl_void) {
769 #define SHOW_SONAME(B) \
770 if (elf->elf_class == ELFCLASS ## B) { \
771 Elf ## B ## _Dyn *dyn; \
772 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
773 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
774 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
775 Elf ## B ## _Off offset; \
776 /* only look for soname in shared objects */ \
777 if (ehdr->e_type != ET_DYN) \
778 return NULL; \
779 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
780 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
781 offset = EGET(phdr[i].p_offset); \
782 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
783 dyn = DYN ## B (elf->data + offset); \
784 while (EGET(dyn->d_tag) != DT_NULL) { \
785 if (EGET(dyn->d_tag) == DT_SONAME) { \
786 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
787 if (offset >= (Elf ## B ## _Off)elf->len) { \
788 ++dyn; \
789 continue; \
790 } \
791 soname = (char*)(elf->data + offset); \
792 *found_soname = 1; \
793 return (be_wewy_wewy_quiet ? NULL : soname); \
794 } \
795 ++dyn; \
796 } \
797 } }
798 SHOW_SONAME(32)
799 SHOW_SONAME(64)
800 }
801
802 return NULL;
803 }
804 static char *scanelf_file_sym(elfobj *elf, char *found_sym)
805 {
806 unsigned long i;
807 char *ret;
808 void *symtab_void, *strtab_void;
809
810 if (!find_sym) return NULL;
811 ret = find_sym;
812
813 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
814
815 if (symtab_void && strtab_void) {
816 #define FIND_SYM(B) \
817 if (elf->elf_class == ELFCLASS ## B) { \
818 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
819 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
820 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
821 unsigned long cnt = EGET(symtab->sh_entsize); \
822 char *symname; \
823 if (cnt) \
824 cnt = EGET(symtab->sh_size) / cnt; \
825 for (i = 0; i < cnt; ++i) { \
826 if (sym->st_name) { \
827 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
828 if ((void*)symname > (void*)elf->data_end) { \
829 warnf("%s: corrupt ELF symbols", elf->filename); \
830 continue; \
831 } \
832 if (*find_sym == '*') { \
833 printf("%s(%s) %5lX %15s %s\n", \
834 ((*found_sym == 0) ? "\n\t" : "\t"), \
835 elf->base_filename, \
836 (unsigned long)sym->st_size, \
837 get_elfstttype(sym->st_info), \
838 symname); \
839 *found_sym = 1; \
840 } else { \
841 char *this_sym, *next_sym; \
842 this_sym = find_sym; \
843 do { \
844 next_sym = strchr(this_sym, ','); \
845 if (next_sym == NULL) \
846 next_sym = this_sym + strlen(this_sym); \
847 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
848 (strcmp(symname, versioned_symname) == 0)) { \
849 ret = this_sym; \
850 (*found_sym)++; \
851 goto break_out; \
852 } \
853 this_sym = next_sym + 1; \
854 } while (*next_sym != '\0'); \
855 } \
856 } \
857 ++sym; \
858 } }
859 FIND_SYM(32)
860 FIND_SYM(64)
861 }
862
863 break_out:
864 if (be_wewy_wewy_quiet) return NULL;
865
866 if (*find_sym != '*' && *found_sym)
867 return ret;
868 if (be_quiet)
869 return NULL;
870 else
871 return (char *)" - ";
872 }
873
874
875 /* scan an elf file and show all the fun stuff */
876 #define prints(str) write(fileno(stdout), str, strlen(str))
877 static int scanelf_elfobj(elfobj *elf)
878 {
879 unsigned long i;
880 char found_pax, found_phdr, found_relro, found_load, found_textrel,
881 found_rpath, found_needed, found_interp, found_bind, found_soname,
882 found_sym, found_lib, found_file, found_textrels;
883 static char *out_buffer = NULL;
884 static size_t out_len;
885
886 found_pax = found_phdr = found_relro = found_load = found_textrel = \
887 found_rpath = found_needed = found_interp = found_bind = found_soname = \
888 found_sym = found_lib = found_file = found_textrels = 0;
889
890 if (be_verbose > 2)
891 printf("%s: scanning file {%s,%s}\n", elf->filename,
892 get_elfeitype(EI_CLASS, elf->elf_class),
893 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
894 else if (be_verbose > 1)
895 printf("%s: scanning file\n", elf->filename);
896
897 /* init output buffer */
898 if (!out_buffer) {
899 out_len = sizeof(char) * 80;
900 out_buffer = (char*)xmalloc(out_len);
901 }
902 *out_buffer = '\0';
903
904 /* show the header */
905 if (!be_quiet && show_banner) {
906 for (i = 0; out_format[i]; ++i) {
907 if (!IS_MODIFIER(out_format[i])) continue;
908
909 switch (out_format[++i]) {
910 case '%': break;
911 case '#': break;
912 case 'F':
913 case 'p':
914 case 'f': prints("FILE "); found_file = 1; break;
915 case 'o': prints(" TYPE "); break;
916 case 'x': prints(" PAX "); break;
917 case 'e': prints("STK/REL/PTL "); break;
918 case 't': prints("TEXTREL "); break;
919 case 'r': prints("RPATH "); break;
920 case 'n': prints("NEEDED "); break;
921 case 'i': prints("INTERP "); break;
922 case 'b': prints("BIND "); break;
923 case 'S': prints("SONAME "); break;
924 case 's': prints("SYM "); break;
925 case 'N': prints("LIB "); break;
926 case 'T': prints("TEXTRELS "); break;
927 default: warnf("'%c' has no title ?", out_format[i]);
928 }
929 }
930 if (!found_file) prints("FILE ");
931 prints("\n");
932 found_file = 0;
933 show_banner = 0;
934 }
935
936 /* dump all the good stuff */
937 for (i = 0; out_format[i]; ++i) {
938 const char *out;
939 const char *tmp;
940
941 /* make sure we trim leading spaces in quiet mode */
942 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
943 *out_buffer = '\0';
944
945 if (!IS_MODIFIER(out_format[i])) {
946 xchrcat(&out_buffer, out_format[i], &out_len);
947 continue;
948 }
949
950 out = NULL;
951 be_wewy_wewy_quiet = (out_format[i] == '#');
952 switch (out_format[++i]) {
953 case '%':
954 case '#':
955 xchrcat(&out_buffer, out_format[i], &out_len); break;
956 case 'F':
957 found_file = 1;
958 if (be_wewy_wewy_quiet) break;
959 xstrcat(&out_buffer, elf->filename, &out_len);
960 break;
961 case 'p':
962 found_file = 1;
963 if (be_wewy_wewy_quiet) break;
964 tmp = elf->filename;
965 if (search_path) {
966 ssize_t len_search = strlen(search_path);
967 ssize_t len_file = strlen(elf->filename);
968 if (!strncmp(elf->filename, search_path, len_search) && \
969 len_file > len_search)
970 tmp += len_search;
971 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
972 }
973 xstrcat(&out_buffer, tmp, &out_len);
974 break;
975 case 'f':
976 found_file = 1;
977 if (be_wewy_wewy_quiet) break;
978 tmp = strrchr(elf->filename, '/');
979 tmp = (tmp == NULL ? elf->filename : tmp+1);
980 xstrcat(&out_buffer, tmp, &out_len);
981 break;
982 case 'o': out = get_elfetype(elf); break;
983 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
984 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
985 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
986 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
987 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
988 case 'n':
989 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
990 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
991 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
992 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
993 case 's': out = scanelf_file_sym(elf, &found_sym); break;
994 default: warnf("'%c' has no scan code?", out_format[i]);
995 }
996 if (out) {
997 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
998 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
999 xstrncat(&out_buffer, out, &out_len, (tmp-out));
1000 else
1001 xstrcat(&out_buffer, out, &out_len);
1002 }
1003 }
1004
1005 #define FOUND_SOMETHING() \
1006 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1007 found_rpath || found_needed || found_interp || found_bind || \
1008 found_soname || found_sym || found_lib || found_textrels)
1009
1010 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1011 xchrcat(&out_buffer, ' ', &out_len);
1012 xstrcat(&out_buffer, elf->filename, &out_len);
1013 }
1014 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
1015 puts(out_buffer);
1016 fflush(stdout);
1017 }
1018
1019 return 0;
1020 }
1021
1022 /* scan a single elf */
1023 static int scanelf_elf(const char *filename, int fd, size_t len)
1024 {
1025 int ret = 1;
1026 elfobj *elf;
1027
1028 /* verify this is real ELF */
1029 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1030 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1031 return ret;
1032 }
1033 switch (match_bits) {
1034 case 32:
1035 if (elf->elf_class != ELFCLASS32)
1036 goto label_done;
1037 break;
1038 case 64:
1039 if (elf->elf_class != ELFCLASS64)
1040 goto label_done;
1041 break;
1042 default: break;
1043 }
1044 if (strlen(match_etypes)) {
1045 char sbuf[126];
1046 strncpy(sbuf, match_etypes, sizeof(sbuf));
1047 if (strchr(match_etypes, ',') != NULL) {
1048 char *p;
1049 while((p = strrchr(sbuf, ',')) != NULL) {
1050 *p = 0;
1051 if (atoi(p+1) == get_etype(elf))
1052 goto label_ret;
1053 }
1054 }
1055 if (atoi(sbuf) != get_etype(elf))
1056 goto label_done;
1057 }
1058
1059 label_ret:
1060 ret = scanelf_elfobj(elf);
1061
1062 label_done:
1063 unreadelf(elf);
1064 return ret;
1065 }
1066
1067 /* scan an archive of elfs */
1068 static int scanelf_archive(const char *filename, int fd, size_t len)
1069 {
1070 archive_handle *ar;
1071 archive_member *m;
1072 char *ar_buffer;
1073 elfobj *elf;
1074
1075 ar = ar_open_fd(filename, fd);
1076 if (ar == NULL)
1077 return 1;
1078
1079 ar_buffer = (char*)mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1080 while ((m=ar_next(ar)) != NULL) {
1081 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size);
1082 if (elf) {
1083 scanelf_elfobj(elf);
1084 unreadelf(elf);
1085 }
1086 }
1087 munmap(ar_buffer, len);
1088
1089 return 0;
1090 }
1091 /* scan a file which may be an elf or an archive or some other magical beast */
1092 static void scanelf_file(const char *filename)
1093 {
1094 struct stat st;
1095 int fd;
1096
1097 /* make sure 'filename' exists */
1098 if (lstat(filename, &st) == -1) {
1099 if (be_verbose > 2) printf("%s: does not exist\n", filename);
1100 return;
1101 }
1102
1103 /* always handle regular files and handle symlinked files if no -y */
1104 if (S_ISLNK(st.st_mode)) {
1105 if (!scan_symlink) return;
1106 stat(filename, &st);
1107 }
1108 if (!S_ISREG(st.st_mode)) {
1109 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1110 return;
1111 }
1112
1113 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1114 return;
1115
1116 if (scanelf_elf(filename, fd, st.st_size) == 1 && scan_archives)
1117 /* if it isn't an ELF, maybe it's an .a archive */
1118 scanelf_archive(filename, fd, st.st_size);
1119
1120 close(fd);
1121 }
1122
1123 /* scan a directory for ET_EXEC files and print when we find one */
1124 static void scanelf_dir(const char *path)
1125 {
1126 register DIR *dir;
1127 register struct dirent *dentry;
1128 struct stat st_top, st;
1129 char buf[__PAX_UTILS_PATH_MAX];
1130 size_t pathlen = 0, len = 0;
1131
1132 /* make sure path exists */
1133 if (lstat(path, &st_top) == -1) {
1134 if (be_verbose > 2) printf("%s: does not exist\n", path);
1135 return;
1136 }
1137
1138 /* ok, if it isn't a directory, assume we can open it */
1139 if (!S_ISDIR(st_top.st_mode)) {
1140 scanelf_file(path);
1141 return;
1142 }
1143
1144 /* now scan the dir looking for fun stuff */
1145 if ((dir = opendir(path)) == NULL) {
1146 warnf("could not opendir %s: %s", path, strerror(errno));
1147 return;
1148 }
1149 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1150
1151 pathlen = strlen(path);
1152 while ((dentry = readdir(dir))) {
1153 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1154 continue;
1155 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
1156 if (len >= sizeof(buf)) {
1157 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1158 (unsigned long)len, (unsigned long)sizeof(buf));
1159 continue;
1160 }
1161 sprintf(buf, "%s/%s", path, dentry->d_name);
1162 if (lstat(buf, &st) != -1) {
1163 if (S_ISREG(st.st_mode))
1164 scanelf_file(buf);
1165 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1166 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1167 scanelf_dir(buf);
1168 }
1169 }
1170 }
1171 closedir(dir);
1172 }
1173
1174 static int scanelf_from_file(char *filename)
1175 {
1176 FILE *fp = NULL;
1177 char *p;
1178 char path[__PAX_UTILS_PATH_MAX];
1179
1180 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL))
1181 fp = stdin;
1182 else if ((fp = fopen(filename, "r")) == NULL)
1183 return 1;
1184
1185 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1186 if ((p = strchr(path, '\n')) != NULL)
1187 *p = 0;
1188 search_path = path;
1189 scanelf_dir(path);
1190 }
1191 if (fp != stdin)
1192 fclose(fp);
1193 return 0;
1194 }
1195
1196 static void load_ld_so_conf()
1197 {
1198 FILE *fp = NULL;
1199 char *p;
1200 char path[__PAX_UTILS_PATH_MAX];
1201 int i = 0;
1202
1203 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL)
1204 return;
1205
1206 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1207 if (*path != '/')
1208 continue;
1209
1210 if ((p = strrchr(path, '\r')) != NULL)
1211 *p = 0;
1212 if ((p = strchr(path, '\n')) != NULL)
1213 *p = 0;
1214
1215 ldpaths[i++] = xstrdup(path);
1216
1217 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
1218 break;
1219 }
1220 ldpaths[i] = NULL;
1221
1222 fclose(fp);
1223 }
1224
1225 /* scan /etc/ld.so.conf for paths */
1226 static void scanelf_ldpath()
1227 {
1228 char scan_l, scan_ul, scan_ull;
1229 int i = 0;
1230
1231 if (!ldpaths[0])
1232 err("Unable to load any paths from ld.so.conf");
1233
1234 scan_l = scan_ul = scan_ull = 0;
1235
1236 while (ldpaths[i]) {
1237 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
1238 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
1239 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
1240 scanelf_dir(ldpaths[i]);
1241 ++i;
1242 }
1243
1244 if (!scan_l) scanelf_dir("/lib");
1245 if (!scan_ul) scanelf_dir("/usr/lib");
1246 if (!scan_ull) scanelf_dir("/usr/local/lib");
1247 }
1248
1249 /* scan env PATH for paths */
1250 static void scanelf_envpath()
1251 {
1252 char *path, *p;
1253
1254 path = getenv("PATH");
1255 if (!path)
1256 err("PATH is not set in your env !");
1257 path = xstrdup(path);
1258
1259 while ((p = strrchr(path, ':')) != NULL) {
1260 scanelf_dir(p + 1);
1261 *p = 0;
1262 }
1263
1264 free(path);
1265 }
1266
1267
1268 /* usage / invocation handling functions */
1269 #define PARSE_FLAGS "plRmyAXxetrnLibSs:gN:TaqvF:f:o:M:E:BhV"
1270 #define a_argument required_argument
1271 static struct option const long_opts[] = {
1272 {"path", no_argument, NULL, 'p'},
1273 {"ldpath", no_argument, NULL, 'l'},
1274 {"recursive", no_argument, NULL, 'R'},
1275 {"mount", no_argument, NULL, 'm'},
1276 {"symlink", no_argument, NULL, 'y'},
1277 {"archives", no_argument, NULL, 'A'},
1278 {"ldcache", no_argument, NULL, 'L'},
1279 {"fix", no_argument, NULL, 'X'},
1280 {"pax", no_argument, NULL, 'x'},
1281 {"header", no_argument, NULL, 'e'},
1282 {"textrel", no_argument, NULL, 't'},
1283 {"rpath", no_argument, NULL, 'r'},
1284 {"needed", no_argument, NULL, 'n'},
1285 {"interp", no_argument, NULL, 'i'},
1286 {"bind", no_argument, NULL, 'b'},
1287 {"soname", no_argument, NULL, 'S'},
1288 {"symbol", a_argument, NULL, 's'},
1289 {"lib", a_argument, NULL, 'N'},
1290 {"gmatch", no_argument, NULL, 'g'},
1291 {"textrels", no_argument, NULL, 'T'},
1292 {"etype", a_argument, NULL, 'E'},
1293 {"bits", a_argument, NULL, 'M'},
1294 {"all", no_argument, NULL, 'a'},
1295 {"quiet", no_argument, NULL, 'q'},
1296 {"verbose", no_argument, NULL, 'v'},
1297 {"format", a_argument, NULL, 'F'},
1298 {"from", a_argument, NULL, 'f'},
1299 {"file", a_argument, NULL, 'o'},
1300 {"nobanner", no_argument, NULL, 'B'},
1301 {"help", no_argument, NULL, 'h'},
1302 {"version", no_argument, NULL, 'V'},
1303 {NULL, no_argument, NULL, 0x0}
1304 };
1305
1306 static const char *opts_help[] = {
1307 "Scan all directories in PATH environment",
1308 "Scan all directories in /etc/ld.so.conf",
1309 "Scan directories recursively",
1310 "Don't recursively cross mount points",
1311 "Don't scan symlinks",
1312 "Scan archives (.a files)",
1313 "Utilize ld.so.cache information (use with -r/-n)",
1314 "Try and 'fix' bad things (use with -r/-e)\n",
1315 "Print PaX markings",
1316 "Print GNU_STACK/PT_LOAD markings",
1317 "Print TEXTREL information",
1318 "Print RPATH information",
1319 "Print NEEDED information",
1320 "Print INTERP information",
1321 "Print BIND information",
1322 "Print SONAME information",
1323 "Find a specified symbol",
1324 "Find a specified library",
1325 "Use strncmp to match libraries. (use with -N)",
1326 "Locate cause of TEXTREL",
1327 "Print only ELF files matching numeric constant type",
1328 "Print only ELF files matching numeric bits",
1329 "Print all scanned info (-x -e -t -r -b)\n",
1330 "Only output 'bad' things",
1331 "Be verbose (can be specified more than once)",
1332 "Use specified format for output",
1333 "Read input stream from a filename",
1334 "Write output stream to a filename",
1335 "Don't display the header",
1336 "Print this help and exit",
1337 "Print version and exit",
1338 NULL
1339 };
1340
1341 /* display usage and exit */
1342 static void usage(int status)
1343 {
1344 unsigned long i;
1345 printf("* Scan ELF binaries for stuff\n\n"
1346 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1347 printf("Options: -[%s]\n", PARSE_FLAGS);
1348 for (i = 0; long_opts[i].name; ++i)
1349 if (long_opts[i].has_arg == no_argument)
1350 printf(" -%c, --%-13s* %s\n", long_opts[i].val,
1351 long_opts[i].name, opts_help[i]);
1352 else
1353 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val,
1354 long_opts[i].name, opts_help[i]);
1355
1356 if (status != EXIT_SUCCESS)
1357 exit(status);
1358
1359 puts("\nThe format modifiers for the -F option are:");
1360 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1361 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1362 puts(" i INTERP \tb BIND \ts symbol");
1363 puts(" N library \to Type \tT TEXTRELs");
1364 puts(" S SONAME");
1365 puts(" p filename (with search path removed)");
1366 puts(" f filename (short name/basename)");
1367 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1368
1369 puts("\nELF Etypes:");
1370 print_etypes(stdout);
1371
1372 exit(status);
1373 }
1374
1375 /* parse command line arguments and preform needed actions */
1376 static void parseargs(int argc, char *argv[])
1377 {
1378 int i;
1379 char *from_file = NULL;
1380
1381 opterr = 0;
1382 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1383 switch (i) {
1384
1385 case 'V':
1386 printf("pax-utils-%s: %s compiled %s\n%s\n"
1387 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
1388 VERSION, __FILE__, __DATE__, rcsid, argv0);
1389 exit(EXIT_SUCCESS);
1390 break;
1391 case 'h': usage(EXIT_SUCCESS); break;
1392 case 'f':
1393 if (from_file) warn("You prob don't want to specify -f twice");
1394 from_file = optarg;
1395 break;
1396 case 'E':
1397 strncpy(match_etypes, optarg, sizeof(match_etypes));
1398 break;
1399 case 'M':
1400 match_bits = atoi(optarg);
1401 break;
1402 case 'o': {
1403 FILE *fp = NULL;
1404 if ((fp = freopen(optarg, "w", stdout)) == NULL)
1405 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1406 SET_STDOUT(fp);
1407 break;
1408 }
1409
1410 case 's': {
1411 if (find_sym) warn("You prob don't want to specify -s twice");
1412 find_sym = optarg;
1413 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1414 sprintf(versioned_symname, "%s@", find_sym);
1415 break;
1416 }
1417 case 'N': {
1418 if (find_lib) warn("You prob don't want to specify -N twice");
1419 find_lib = optarg;
1420 break;
1421 }
1422
1423 case 'F': {
1424 if (out_format) warn("You prob don't want to specify -F twice");
1425 out_format = optarg;
1426 break;
1427 }
1428
1429 case 'g': gmatch = 1; /* break; any reason we dont breal; here ? */
1430 case 'L': use_ldcache = 1; break;
1431 case 'y': scan_symlink = 0; break;
1432 case 'A': scan_archives = 1; break;
1433 case 'B': show_banner = 0; break;
1434 case 'l': scan_ldpath = 1; break;
1435 case 'p': scan_envpath = 1; break;
1436 case 'R': dir_recurse = 1; break;
1437 case 'm': dir_crossmount = 0; break;
1438 case 'X': ++fix_elf; break;
1439 case 'x': show_pax = 1; break;
1440 case 'e': show_phdr = 1; break;
1441 case 't': show_textrel = 1; break;
1442 case 'r': show_rpath = 1; break;
1443 case 'n': show_needed = 1; break;
1444 case 'i': show_interp = 1; break;
1445 case 'b': show_bind = 1; break;
1446 case 'S': show_soname = 1; break;
1447 case 'T': show_textrels = 1; break;
1448 case 'q': be_quiet = 1; break;
1449 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1450 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
1451
1452 case ':':
1453 err("Option '%c' is missing parameter", optopt);
1454 case '?':
1455 err("Unknown option '%c' or argument missing", optopt);
1456 default:
1457 err("Unhandled option '%c'; please report this", i);
1458 }
1459 }
1460
1461 /* let the format option override all other options */
1462 if (out_format) {
1463 show_pax = show_phdr = show_textrel = show_rpath = \
1464 show_needed = show_interp = show_bind = show_soname = \
1465 show_textrels = 0;
1466 for (i = 0; out_format[i]; ++i) {
1467 if (!IS_MODIFIER(out_format[i])) continue;
1468
1469 switch (out_format[++i]) {
1470 case '%': break;
1471 case '#': break;
1472 case 'F': break;
1473 case 'p': break;
1474 case 'f': break;
1475 case 's': break;
1476 case 'N': break;
1477 case 'o': break;
1478 case 'x': show_pax = 1; break;
1479 case 'e': show_phdr = 1; break;
1480 case 't': show_textrel = 1; break;
1481 case 'r': show_rpath = 1; break;
1482 case 'n': show_needed = 1; break;
1483 case 'i': show_interp = 1; break;
1484 case 'b': show_bind = 1; break;
1485 case 'S': show_soname = 1; break;
1486 case 'T': show_textrels = 1; break;
1487 default:
1488 err("Invalid format specifier '%c' (byte %i)",
1489 out_format[i], i+1);
1490 }
1491 }
1492
1493 /* construct our default format */
1494 } else {
1495 size_t fmt_len = 30;
1496 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
1497 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1498 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1499 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1500 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1501 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1502 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1503 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1504 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1505 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1506 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1507 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1508 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1509 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1510 }
1511 if (be_verbose > 2) printf("Format: %s\n", out_format);
1512
1513 /* now lets actually do the scanning */
1514 if (scan_ldpath || use_ldcache)
1515 load_ld_so_conf();
1516 if (scan_ldpath) scanelf_ldpath();
1517 if (scan_envpath) scanelf_envpath();
1518 if (from_file) {
1519 scanelf_from_file(from_file);
1520 from_file = *argv;
1521 }
1522 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1523 err("Nothing to scan !?");
1524 while (optind < argc) {
1525 search_path = argv[optind++];
1526 scanelf_dir(search_path);
1527 }
1528
1529 /* clean up */
1530 if (versioned_symname) free(versioned_symname);
1531 for (i = 0; ldpaths[i]; ++i)
1532 free(ldpaths[i]);
1533
1534 if (ldcache != 0)
1535 munmap(ldcache, ldcache_size);
1536 }
1537
1538
1539
1540 /* utility funcs */
1541 static char *xstrdup(const char *s)
1542 {
1543 char *ret = strdup(s);
1544 if (!ret) err("Could not strdup(): %s", strerror(errno));
1545 return ret;
1546 }
1547 static void *xmalloc(size_t size)
1548 {
1549 void *ret = malloc(size);
1550 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1551 return ret;
1552 }
1553 static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
1554 {
1555 size_t new_len;
1556
1557 new_len = strlen(*dst) + strlen(src);
1558 if (*curr_len <= new_len) {
1559 *curr_len = new_len + (*curr_len / 2);
1560 *dst = realloc(*dst, *curr_len);
1561 if (!*dst)
1562 err("could not realloc() %li bytes", (unsigned long)*curr_len);
1563 }
1564
1565 if (n)
1566 strncat(*dst, src, n);
1567 else
1568 strcat(*dst, src);
1569 }
1570 static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1571 {
1572 static char my_app[2];
1573 my_app[0] = append;
1574 my_app[1] = '\0';
1575 xstrcat(dst, my_app, curr_len);
1576 }
1577
1578
1579
1580 int main(int argc, char *argv[])
1581 {
1582 if (argc < 2)
1583 usage(EXIT_FAILURE);
1584 parseargs(argc, argv);
1585 fclose(stdout);
1586 #ifdef __BOUNDS_CHECKING_ON
1587 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()");
1588 #endif
1589 return EXIT_SUCCESS;
1590 }

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