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Revision 1.104 - (show annotations) (download) (as text)
Fri Jan 13 11:31:55 2006 UTC (8 years, 8 months ago) by vapier
Branch: MAIN
Changes since 1.103: +10 -8 lines
File MIME type: text/x-csrc
define and use our own copy of PATH_MAX

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 1.103 2006/01/11 23:46:21 vapier 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 1.103 2006/01/11 23:46:21 vapier Exp $";
13 #define argv0 "scanelf"
14
15 #define IS_MODIFIER(c) (c == '%' || c == '#')
16
17
18
19 /* prototypes */
20 static void scanelf_file(const char *filename);
21 static void scanelf_dir(const char *path);
22 static void scanelf_ldpath();
23 static void scanelf_envpath();
24 static void usage(int status);
25 static void parseargs(int argc, char *argv[]);
26 static char *xstrdup(const char *s);
27 static void *xmalloc(size_t size);
28 static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n);
29 #define xstrcat(dst,src,curr_len) xstrncat(dst,src,curr_len,0)
30 static inline void xchrcat(char **dst, const char append, size_t *curr_len);
31
32 /* variables to control behavior */
33 static char *ldpaths[256];
34 static char scan_ldpath = 0;
35 static char scan_envpath = 0;
36 static char scan_symlink = 1;
37 static char dir_recurse = 0;
38 static char dir_crossmount = 1;
39 static char show_pax = 0;
40 static char show_phdr = 0;
41 static char show_textrel = 0;
42 static char show_rpath = 0;
43 static char show_needed = 0;
44 static char show_interp = 0;
45 static char show_bind = 0;
46 static char show_soname = 0;
47 static char show_textrels = 0;
48 static char show_banner = 1;
49 static char be_quiet = 0;
50 static char be_verbose = 0;
51 static char be_wewy_wewy_quiet = 0;
52 static char *find_sym = NULL, *versioned_symname = NULL;
53 static char *find_lib = NULL;
54 static char *out_format = NULL;
55 static char *search_path = NULL;
56 static char fix_elf = 0;
57 static char gmatch = 0;
58 static char use_ldcache = 0;
59
60
61 caddr_t ldcache = 0;
62 size_t ldcache_size = 0;
63
64 /* sub-funcs for scanelf_file() */
65 static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
66 {
67 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
68 #define GET_SYMTABS(B) \
69 if (elf->elf_class == ELFCLASS ## B) { \
70 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
71 /* debug sections */ \
72 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
73 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
74 /* runtime sections */ \
75 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
76 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
77 if (symtab && dynsym) { \
78 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \
79 } else { \
80 *sym = (void*)(symtab ? symtab : dynsym); \
81 } \
82 if (strtab && dynstr) { \
83 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \
84 } else { \
85 *tab = (void*)(strtab ? strtab : dynstr); \
86 } \
87 }
88 GET_SYMTABS(32)
89 GET_SYMTABS(64)
90 }
91 static char *scanelf_file_pax(elfobj *elf, char *found_pax)
92 {
93 static char ret[7];
94 unsigned long i, shown;
95
96 if (!show_pax) return NULL;
97
98 shown = 0;
99 memset(&ret, 0, sizeof(ret));
100
101 if (elf->phdr) {
102 #define SHOW_PAX(B) \
103 if (elf->elf_class == ELFCLASS ## B) { \
104 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
105 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
106 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
107 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
108 continue; \
109 if (be_quiet && (EGET(phdr[i].p_flags) == 10240)) \
110 continue; \
111 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
112 *found_pax = 1; \
113 ++shown; \
114 break; \
115 } \
116 }
117 SHOW_PAX(32)
118 SHOW_PAX(64)
119 }
120
121 /* fall back to EI_PAX if no PT_PAX was found */
122 if (!*ret) {
123 static char *paxflags;
124 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
125 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
126 *found_pax = 1;
127 return (be_wewy_wewy_quiet ? NULL : paxflags);
128 }
129 strncpy(ret, paxflags, sizeof(ret));
130 }
131
132 if (be_wewy_wewy_quiet || (be_quiet && !shown))
133 return NULL;
134 else
135 return ret;
136 }
137
138 static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
139 {
140 static char ret[12];
141 char *found;
142 unsigned long i, shown, multi_stack, multi_relro, multi_load;
143 int max_pt_load;
144
145 if (!show_phdr) return NULL;
146
147 memcpy(ret, "--- --- ---\0", 12);
148
149 shown = 0;
150 multi_stack = multi_relro = multi_load = 0;
151 max_pt_load = elf_max_pt_load(elf);
152
153 #define SHOW_PHDR(B) \
154 if (elf->elf_class == ELFCLASS ## B) { \
155 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
156 Elf ## B ## _Off offset; \
157 uint32_t flags, check_flags; \
158 if (elf->phdr != NULL) { \
159 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
160 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
161 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
162 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
163 found = found_phdr; \
164 offset = 0; \
165 check_flags = PF_X; \
166 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
167 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
168 found = found_relro; \
169 offset = 4; \
170 check_flags = PF_X; \
171 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
172 if (multi_load++ > max_pt_load) warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
173 found = found_load; \
174 offset = 8; \
175 check_flags = PF_W|PF_X; \
176 } else \
177 continue; \
178 flags = EGET(phdr[i].p_flags); \
179 if (be_quiet && ((flags & check_flags) != check_flags)) \
180 continue; \
181 if (fix_elf && ((flags & PF_X) != flags)) { \
182 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
183 ret[3] = ret[7] = '!'; \
184 flags = EGET(phdr[i].p_flags); \
185 } \
186 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
187 *found = 1; \
188 ++shown; \
189 } \
190 } else if (elf->shdr != NULL) { \
191 /* no program headers which means this is prob an object file */ \
192 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
193 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
194 check_flags = SHF_WRITE|SHF_EXECINSTR; \
195 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
196 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
197 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
198 if (!strcmp((char*)(elf->data + offset), ".note.GNU-stack")) { \
199 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
200 flags = EGET(shdr[i].sh_flags); \
201 if (be_quiet && ((flags & check_flags) != check_flags)) \
202 continue; \
203 ++*found_phdr; \
204 shown = 1; \
205 if (flags & SHF_WRITE) ret[0] = 'W'; \
206 if (flags & SHF_ALLOC) ret[1] = 'A'; \
207 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
208 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
209 break; \
210 } \
211 } \
212 if (!multi_stack) { \
213 *found_phdr = 1; \
214 shown = 1; \
215 memcpy(ret, "!WX", 3); \
216 } \
217 } \
218 }
219 SHOW_PHDR(32)
220 SHOW_PHDR(64)
221
222 if (be_wewy_wewy_quiet || (be_quiet && !shown))
223 return NULL;
224 else
225 return ret;
226 }
227 static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
228 {
229 static const char *ret = "TEXTREL";
230 unsigned long i;
231
232 if (!show_textrel && !show_textrels) return NULL;
233
234 if (elf->phdr) {
235 #define SHOW_TEXTREL(B) \
236 if (elf->elf_class == ELFCLASS ## B) { \
237 Elf ## B ## _Dyn *dyn; \
238 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
239 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
240 Elf ## B ## _Off offset; \
241 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
242 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
243 offset = EGET(phdr[i].p_offset); \
244 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
245 dyn = DYN ## B (elf->data + offset); \
246 while (EGET(dyn->d_tag) != DT_NULL) { \
247 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
248 *found_textrel = 1; \
249 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
250 return (be_wewy_wewy_quiet ? NULL : ret); \
251 } \
252 ++dyn; \
253 } \
254 } }
255 SHOW_TEXTREL(32)
256 SHOW_TEXTREL(64)
257 }
258
259 if (be_quiet || be_wewy_wewy_quiet)
260 return NULL;
261 else
262 return " - ";
263 }
264 static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
265 {
266 unsigned long s, r, rmax;
267 void *symtab_void, *strtab_void, *text_void;
268
269 if (!show_textrels) return NULL;
270
271 /* don't search for TEXTREL's if the ELF doesn't have any */
272 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
273 if (!*found_textrel) return NULL;
274
275 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
276 text_void = elf_findsecbyname(elf, ".text");
277
278 if (symtab_void && strtab_void && text_void && elf->shdr) {
279 #define SHOW_TEXTRELS(B) \
280 if (elf->elf_class == ELFCLASS ## B) { \
281 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
282 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
283 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
284 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
285 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
286 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
287 uint ## B ## _t memsz = EGET(text->sh_size); \
288 Elf ## B ## _Rel *rel; \
289 Elf ## B ## _Rela *rela; \
290 /* search the section headers for relocations */ \
291 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
292 uint32_t sh_type = EGET(shdr[s].sh_type); \
293 if (sh_type == SHT_REL) { \
294 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \
295 rela = NULL; \
296 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
297 } else if (sh_type == SHT_RELA) { \
298 rel = NULL; \
299 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \
300 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
301 } else \
302 continue; \
303 /* now see if any of the relocs are in the .text */ \
304 for (r = 0; r < rmax; ++r) { \
305 unsigned long sym_max; \
306 Elf ## B ## _Addr offset_tmp; \
307 Elf ## B ## _Sym *func; \
308 Elf ## B ## _Sym *sym; \
309 Elf ## B ## _Addr r_offset; \
310 uint ## B ## _t r_info; \
311 if (sh_type == SHT_REL) { \
312 r_offset = EGET(rel[r].r_offset); \
313 r_info = EGET(rel[r].r_info); \
314 } else { \
315 r_offset = EGET(rela[r].r_offset); \
316 r_info = EGET(rela[r].r_info); \
317 } \
318 /* make sure this relocation is inside of the .text */ \
319 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
320 if (be_verbose <= 2) continue; \
321 } else \
322 *found_textrels = 1; \
323 /* locate this relocation symbol name */ \
324 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
325 sym_max = ELF ## B ## _R_SYM(r_info); \
326 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
327 sym += sym_max; \
328 else \
329 sym = NULL; \
330 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
331 /* show the raw details about this reloc */ \
332 printf(" %s: ", elf->base_filename); \
333 if (sym && sym->st_name) \
334 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \
335 else \
336 printf("(memory/fake?)"); \
337 printf(" [0x%lX]", (unsigned long)r_offset); \
338 /* now try to find the closest symbol that this rel is probably in */ \
339 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
340 func = NULL; \
341 offset_tmp = 0; \
342 while (sym_max--) { \
343 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
344 func = sym; \
345 offset_tmp = EGET(sym->st_value); \
346 } \
347 ++sym; \
348 } \
349 printf(" in "); \
350 if (func && func->st_name) \
351 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \
352 else \
353 printf("(NULL: fake?)"); \
354 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
355 } \
356 } }
357 SHOW_TEXTRELS(32)
358 SHOW_TEXTRELS(64)
359 }
360 if (!*found_textrels)
361 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
362
363 return NULL;
364 }
365
366 static void rpath_security_checks(elfobj *, char *, const char *);
367 static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
368 {
369 struct stat st;
370 switch (*item) {
371 case '/': break;
372 case '.':
373 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
374 break;
375 case ':':
376 case '\0':
377 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
378 break;
379 case '$':
380 if (fstat(elf->fd, &st) != -1)
381 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
382 warnf("Security problem with %s='%s' in %s with mode set of %o",
383 dt_type, item, elf->filename, st.st_mode & 07777);
384 break;
385 default:
386 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
387 break;
388 }
389 }
390 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
391 {
392 unsigned long i, s;
393 char *rpath, *runpath, **r;
394 void *strtbl_void;
395
396 if (!show_rpath) return;
397
398 strtbl_void = elf_findsecbyname(elf, ".dynstr");
399 rpath = runpath = NULL;
400
401 if (elf->phdr && strtbl_void) {
402 #define SHOW_RPATH(B) \
403 if (elf->elf_class == ELFCLASS ## B) { \
404 Elf ## B ## _Dyn *dyn; \
405 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
406 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
407 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
408 Elf ## B ## _Off offset; \
409 Elf ## B ## _Xword word; \
410 /* Scan all the program headers */ \
411 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
412 /* Just scan dynamic headers */ \
413 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
414 offset = EGET(phdr[i].p_offset); \
415 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
416 /* Just scan dynamic RPATH/RUNPATH headers */ \
417 dyn = DYN ## B (elf->data + offset); \
418 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
419 if (word == DT_RPATH) { \
420 r = &rpath; \
421 } else if (word == DT_RUNPATH) { \
422 r = &runpath; \
423 } else { \
424 ++dyn; \
425 continue; \
426 } \
427 /* Verify the memory is somewhat sane */ \
428 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
429 if (offset < (Elf ## B ## _Off)elf->len) { \
430 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
431 *r = (char*)(elf->data + offset); \
432 /* cache the length in case we need to nuke this section later on */ \
433 if (fix_elf) \
434 offset = strlen(*r); \
435 /* If quiet, don't output paths in ld.so.conf */ \
436 if (be_quiet) { \
437 size_t len; \
438 char *start, *end; \
439 /* note that we only 'chop' off leading known paths. */ \
440 /* since *r is read-only memory, we can only move the ptr forward. */ \
441 start = *r; \
442 /* scan each path in : delimited list */ \
443 while (start) { \
444 rpath_security_checks(elf, start, get_elfdtype(word)); \
445 end = strchr(start, ':'); \
446 len = (end ? abs(end - start) : strlen(start)); \
447 if (use_ldcache) \
448 for (s = 0; ldpaths[s]; ++s) \
449 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
450 *r = end; \
451 /* corner case ... if RPATH reads "/usr/lib:", we want \
452 * to show ':' rather than '' */ \
453 if (end && end[1] != '\0') \
454 (*r)++; \
455 break; \
456 } \
457 if (!*r || !end) \
458 break; \
459 else \
460 start = start + len + 1; \
461 } \
462 } \
463 if (*r) { \
464 if (fix_elf > 2 || **r == '\0') { \
465 /* just nuke it */ \
466 nuke_it##B: \
467 memset(*r, 0x00, offset); \
468 *r = NULL; \
469 ESET(dyn->d_tag, DT_DEBUG); \
470 ESET(dyn->d_un.d_ptr, 0); \
471 } else if (fix_elf) { \
472 /* try to clean "bad" paths */ \
473 size_t len, tmpdir_len; \
474 char *start, *end; \
475 const char *tmpdir; \
476 start = *r; \
477 tmpdir = (getenv("TMPDIR") ? : "."); \
478 tmpdir_len = strlen(tmpdir); \
479 while (1) { \
480 end = strchr(start, ':'); \
481 if (start == end) { \
482 eat_this_path##B: \
483 len = strlen(end); \
484 memmove(start, end+1, len); \
485 start[len-1] = '\0'; \
486 end = start - 1; \
487 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
488 if (!end) { \
489 if (start == *r) \
490 goto nuke_it##B; \
491 *--start = '\0'; \
492 } else \
493 goto eat_this_path##B; \
494 } \
495 if (!end) \
496 break; \
497 start = end + 1; \
498 } \
499 if (**r == '\0') \
500 goto nuke_it##B; \
501 } \
502 if (*r) \
503 *found_rpath = 1; \
504 } \
505 } \
506 ++dyn; \
507 } \
508 } }
509 SHOW_RPATH(32)
510 SHOW_RPATH(64)
511 }
512
513 if (be_wewy_wewy_quiet) return;
514
515 if (rpath && runpath) {
516 if (!strcmp(rpath, runpath)) {
517 xstrcat(ret, runpath, ret_len);
518 } else {
519 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
520 xchrcat(ret, '{', ret_len);
521 xstrcat(ret, rpath, ret_len);
522 xchrcat(ret, ',', ret_len);
523 xstrcat(ret, runpath, ret_len);
524 xchrcat(ret, '}', ret_len);
525 }
526 } else if (rpath || runpath)
527 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
528 else if (!be_quiet)
529 xstrcat(ret, " - ", ret_len);
530 }
531
532 #define LDSO_CACHE_MAGIC "ld.so-"
533 #define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
534 #define LDSO_CACHE_VER "1.7.0"
535 #define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
536 #define FLAG_ANY -1
537 #define FLAG_TYPE_MASK 0x00ff
538 #define FLAG_LIBC4 0x0000
539 #define FLAG_ELF 0x0001
540 #define FLAG_ELF_LIBC5 0x0002
541 #define FLAG_ELF_LIBC6 0x0003
542 #define FLAG_REQUIRED_MASK 0xff00
543 #define FLAG_SPARC_LIB64 0x0100
544 #define FLAG_IA64_LIB64 0x0200
545 #define FLAG_X8664_LIB64 0x0300
546 #define FLAG_S390_LIB64 0x0400
547 #define FLAG_POWERPC_LIB64 0x0500
548 #define FLAG_MIPS64_LIBN32 0x0600
549 #define FLAG_MIPS64_LIBN64 0x0700
550
551 static char *lookup_cache_lib(elfobj *, char *);
552 static char *lookup_cache_lib(elfobj *elf, char *fname)
553 {
554 int fd = 0;
555 char *strs;
556 static char buf[__PAX_UTILS_PATH_MAX] = "";
557 const char *cachefile = "/etc/ld.so.cache";
558 struct stat st;
559
560 typedef struct {
561 char magic[LDSO_CACHE_MAGIC_LEN];
562 char version[LDSO_CACHE_VER_LEN];
563 int nlibs;
564 } header_t;
565 header_t *header;
566
567 typedef struct {
568 int flags;
569 int sooffset;
570 int liboffset;
571 } libentry_t;
572 libentry_t *libent;
573
574 if (fname == NULL)
575 return NULL;
576
577 if (ldcache == 0) {
578 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1)
579 return NULL;
580
581 /* cache these values so we only map/unmap the cache file once */
582 ldcache_size = st.st_size;
583 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
584
585 close(fd);
586
587 if (ldcache == (caddr_t)-1)
588 return NULL;
589
590 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
591 return NULL;
592 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
593 return NULL;
594 }
595
596 header = (header_t *) ldcache;
597 libent = (libentry_t *) (ldcache + sizeof(header_t));
598 strs = (char *) &libent[header->nlibs];
599
600 for (fd = 0; fd < header->nlibs; fd++) {
601 /* this should be more fine grained, but for now we assume that
602 * diff arches will not be cached together. and we ignore the
603 * the different multilib mips cases. */
604 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
605 continue;
606 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
607 continue;
608
609 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
610 continue;
611 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
612 }
613 return buf;
614 }
615
616
617 static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
618 {
619 unsigned long i;
620 char *needed;
621 void *strtbl_void;
622 char *p;
623
624 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
625
626 strtbl_void = elf_findsecbyname(elf, ".dynstr");
627
628 if (elf->phdr && strtbl_void) {
629 #define SHOW_NEEDED(B) \
630 if (elf->elf_class == ELFCLASS ## B) { \
631 Elf ## B ## _Dyn *dyn; \
632 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
633 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
634 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
635 Elf ## B ## _Off offset; \
636 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
637 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
638 offset = EGET(phdr[i].p_offset); \
639 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
640 dyn = DYN ## B (elf->data + offset); \
641 while (EGET(dyn->d_tag) != DT_NULL) { \
642 if (EGET(dyn->d_tag) == DT_NEEDED) { \
643 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
644 if (offset >= (Elf ## B ## _Off)elf->len) { \
645 ++dyn; \
646 continue; \
647 } \
648 needed = (char*)(elf->data + offset); \
649 if (op == 0) { \
650 if (!be_wewy_wewy_quiet) { \
651 if (*found_needed) xchrcat(ret, ',', ret_len); \
652 if (use_ldcache) \
653 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
654 needed = p; \
655 xstrcat(ret, needed, ret_len); \
656 } \
657 *found_needed = 1; \
658 } else { \
659 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \
660 *found_lib = 1; \
661 return (be_wewy_wewy_quiet ? NULL : needed); \
662 } \
663 } \
664 } \
665 ++dyn; \
666 } \
667 } }
668 SHOW_NEEDED(32)
669 SHOW_NEEDED(64)
670 if (op == 0 && !*found_needed && be_verbose)
671 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
672 }
673
674 return NULL;
675 }
676 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
677 {
678 void *strtbl_void;
679
680 if (!show_interp) return NULL;
681
682 strtbl_void = elf_findsecbyname(elf, ".interp");
683
684 if (strtbl_void) {
685 #define SHOW_INTERP(B) \
686 if (elf->elf_class == ELFCLASS ## B) { \
687 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
688 *found_interp = 1; \
689 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
690 }
691 SHOW_INTERP(32)
692 SHOW_INTERP(64)
693 }
694 return NULL;
695 }
696 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
697 {
698 unsigned long i;
699 struct stat s;
700
701 if (!show_bind) return NULL;
702 if (!elf->phdr) return NULL;
703
704 #define SHOW_BIND(B) \
705 if (elf->elf_class == ELFCLASS ## B) { \
706 Elf ## B ## _Dyn *dyn; \
707 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
708 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
709 Elf ## B ## _Off offset; \
710 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
711 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
712 offset = EGET(phdr[i].p_offset); \
713 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
714 dyn = DYN ## B (elf->data + offset); \
715 while (EGET(dyn->d_tag) != DT_NULL) { \
716 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
717 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
718 { \
719 if (be_quiet) return NULL; \
720 *found_bind = 1; \
721 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
722 } \
723 ++dyn; \
724 } \
725 } \
726 }
727 SHOW_BIND(32)
728 SHOW_BIND(64)
729
730 if (be_wewy_wewy_quiet) return NULL;
731
732 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) {
733 return NULL;
734 } else {
735 *found_bind = 1;
736 return (char *) "LAZY";
737 }
738 }
739 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
740 {
741 unsigned long i;
742 char *soname;
743 void *strtbl_void;
744
745 if (!show_soname) return NULL;
746
747 strtbl_void = elf_findsecbyname(elf, ".dynstr");
748
749 if (elf->phdr && strtbl_void) {
750 #define SHOW_SONAME(B) \
751 if (elf->elf_class == ELFCLASS ## B) { \
752 Elf ## B ## _Dyn *dyn; \
753 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
754 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
755 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
756 Elf ## B ## _Off offset; \
757 /* only look for soname in shared objects */ \
758 if (ehdr->e_type != ET_DYN) \
759 return NULL; \
760 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
761 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
762 offset = EGET(phdr[i].p_offset); \
763 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
764 dyn = DYN ## B (elf->data + offset); \
765 while (EGET(dyn->d_tag) != DT_NULL) { \
766 if (EGET(dyn->d_tag) == DT_SONAME) { \
767 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
768 if (offset >= (Elf ## B ## _Off)elf->len) { \
769 ++dyn; \
770 continue; \
771 } \
772 soname = (char*)(elf->data + offset); \
773 *found_soname = 1; \
774 return (be_wewy_wewy_quiet ? NULL : soname); \
775 } \
776 ++dyn; \
777 } \
778 } }
779 SHOW_SONAME(32)
780 SHOW_SONAME(64)
781 }
782
783 return NULL;
784 }
785 static char *scanelf_file_sym(elfobj *elf, char *found_sym)
786 {
787 unsigned long i;
788 char *ret;
789 void *symtab_void, *strtab_void;
790
791 if (!find_sym) return NULL;
792 ret = find_sym;
793
794 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
795
796 if (symtab_void && strtab_void) {
797 #define FIND_SYM(B) \
798 if (elf->elf_class == ELFCLASS ## B) { \
799 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
800 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
801 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
802 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
803 char *symname; \
804 for (i = 0; i < cnt; ++i) { \
805 if (sym->st_name) { \
806 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
807 if (*find_sym == '*') { \
808 printf("%s(%s) %5lX %15s %s\n", \
809 ((*found_sym == 0) ? "\n\t" : "\t"), \
810 elf->base_filename, \
811 (unsigned long)sym->st_size, \
812 get_elfstttype(sym->st_info), \
813 symname); \
814 *found_sym = 1; \
815 } else { \
816 char *this_sym, *next_sym; \
817 this_sym = find_sym; \
818 do { \
819 next_sym = strchr(this_sym, ','); \
820 if (next_sym == NULL) \
821 next_sym = this_sym + strlen(this_sym); \
822 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
823 (strcmp(symname, versioned_symname) == 0)) { \
824 ret = this_sym; \
825 (*found_sym)++; \
826 goto break_out; \
827 } \
828 this_sym = next_sym + 1; \
829 } while (*next_sym != '\0'); \
830 } \
831 } \
832 ++sym; \
833 } }
834 FIND_SYM(32)
835 FIND_SYM(64)
836 }
837
838 break_out:
839 if (be_wewy_wewy_quiet) return NULL;
840
841 if (*find_sym != '*' && *found_sym)
842 return ret;
843 if (be_quiet)
844 return NULL;
845 else
846 return (char *)" - ";
847 }
848 /* scan an elf file and show all the fun stuff */
849 #define prints(str) write(fileno(stdout), str, strlen(str))
850 static void scanelf_file(const char *filename)
851 {
852 unsigned long i;
853 char found_pax, found_phdr, found_relro, found_load, found_textrel,
854 found_rpath, found_needed, found_interp, found_bind, found_soname,
855 found_sym, found_lib, found_file, found_textrels;
856 elfobj *elf;
857 struct stat st;
858 static char *out_buffer = NULL;
859 static size_t out_len;
860
861 /* make sure 'filename' exists */
862 if (lstat(filename, &st) == -1) {
863 if (be_verbose > 2) printf("%s: does not exist\n", filename);
864 return;
865 }
866 /* always handle regular files and handle symlinked files if no -y */
867 if (S_ISLNK(st.st_mode)) {
868 if (!scan_symlink) return;
869 stat(filename, &st);
870 }
871 if (!S_ISREG(st.st_mode)) {
872 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
873 return;
874 }
875
876 found_pax = found_phdr = found_relro = found_load = found_textrel = \
877 found_rpath = found_needed = found_interp = found_bind = found_soname = \
878 found_sym = found_lib = found_file = found_textrels = 0;
879
880 /* verify this is real ELF */
881 if ((elf = _readelf(filename, !fix_elf)) == NULL) {
882 /* if it isn't an ELF, maybe it's an .a archive */
883 archive_handle *ar = ar_open(filename);
884 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
885 return;
886 }
887
888 if (be_verbose > 1)
889 printf("%s: scanning file {%s,%s}\n", filename,
890 get_elfeitype(EI_CLASS, elf->elf_class),
891 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
892 else if (be_verbose)
893 printf("%s: scanning file\n", filename);
894
895 /* init output buffer */
896 if (!out_buffer) {
897 out_len = sizeof(char) * 80;
898 out_buffer = (char*)xmalloc(out_len);
899 }
900 *out_buffer = '\0';
901
902 /* show the header */
903 if (!be_quiet && show_banner) {
904 for (i = 0; out_format[i]; ++i) {
905 if (!IS_MODIFIER(out_format[i])) continue;
906
907 switch (out_format[++i]) {
908 case '%': break;
909 case '#': break;
910 case 'F':
911 case 'p':
912 case 'f': prints("FILE "); found_file = 1; break;
913 case 'o': prints(" TYPE "); break;
914 case 'x': prints(" PAX "); break;
915 case 'e': prints("STK/REL/PTL "); break;
916 case 't': prints("TEXTREL "); break;
917 case 'r': prints("RPATH "); break;
918 case 'n': prints("NEEDED "); break;
919 case 'i': prints("INTERP "); break;
920 case 'b': prints("BIND "); break;
921 case 'S': prints("SONAME "); break;
922 case 's': prints("SYM "); break;
923 case 'N': prints("LIB "); break;
924 case 'T': prints("TEXTRELS "); break;
925 default: warnf("'%c' has no title ?", out_format[i]);
926 }
927 }
928 if (!found_file) prints("FILE ");
929 prints("\n");
930 found_file = 0;
931 show_banner = 0;
932 }
933
934 /* dump all the good stuff */
935 for (i = 0; out_format[i]; ++i) {
936 const char *out;
937 const char *tmp;
938
939 /* make sure we trim leading spaces in quiet mode */
940 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
941 *out_buffer = '\0';
942
943 if (!IS_MODIFIER(out_format[i])) {
944 xchrcat(&out_buffer, out_format[i], &out_len);
945 continue;
946 }
947
948 out = NULL;
949 be_wewy_wewy_quiet = (out_format[i] == '#');
950 switch (out_format[++i]) {
951 case '%':
952 case '#':
953 xchrcat(&out_buffer, out_format[i], &out_len); break;
954 case 'F':
955 found_file = 1;
956 if (be_wewy_wewy_quiet) break;
957 xstrcat(&out_buffer, filename, &out_len);
958 break;
959 case 'p':
960 found_file = 1;
961 if (be_wewy_wewy_quiet) break;
962 tmp = filename;
963 if (search_path) {
964 ssize_t len_search = strlen(search_path);
965 ssize_t len_file = strlen(filename);
966 if (!strncmp(filename, search_path, len_search) && \
967 len_file > len_search)
968 tmp += len_search;
969 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
970 }
971 xstrcat(&out_buffer, tmp, &out_len);
972 break;
973 case 'f':
974 found_file = 1;
975 if (be_wewy_wewy_quiet) break;
976 tmp = strrchr(filename, '/');
977 tmp = (tmp == NULL ? filename : tmp+1);
978 xstrcat(&out_buffer, tmp, &out_len);
979 break;
980 case 'o': out = get_elfetype(elf); break;
981 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
982 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
983 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
984 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
985 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
986 case 'n':
987 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
988 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
989 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
990 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
991 case 's': out = scanelf_file_sym(elf, &found_sym); break;
992 default: warnf("'%c' has no scan code?", out_format[i]);
993 }
994 if (out) {
995 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
996 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
997 xstrncat(&out_buffer, out, &out_len, (tmp-out));
998 else
999 xstrcat(&out_buffer, out, &out_len);
1000 }
1001 }
1002
1003 #define FOUND_SOMETHING() \
1004 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1005 found_rpath || found_needed || found_interp || found_bind || \
1006 found_soname || found_sym || found_lib || found_textrels)
1007
1008 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1009 xchrcat(&out_buffer, ' ', &out_len);
1010 xstrcat(&out_buffer, filename, &out_len);
1011 }
1012 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
1013 puts(out_buffer);
1014 fflush(stdout);
1015 }
1016
1017 unreadelf(elf);
1018 }
1019
1020 /* scan a directory for ET_EXEC files and print when we find one */
1021 static void scanelf_dir(const char *path)
1022 {
1023 register DIR *dir;
1024 register struct dirent *dentry;
1025 struct stat st_top, st;
1026 char buf[__PAX_UTILS_PATH_MAX];
1027 size_t pathlen = 0, len = 0;
1028
1029 /* make sure path exists */
1030 if (lstat(path, &st_top) == -1) {
1031 if (be_verbose > 2) printf("%s: does not exist\n", path);
1032 return;
1033 }
1034
1035 /* ok, if it isn't a directory, assume we can open it */
1036 if (!S_ISDIR(st_top.st_mode)) {
1037 scanelf_file(path);
1038 return;
1039 }
1040
1041 /* now scan the dir looking for fun stuff */
1042 if ((dir = opendir(path)) == NULL) {
1043 warnf("could not opendir %s: %s", path, strerror(errno));
1044 return;
1045 }
1046 if (be_verbose) printf("%s: scanning dir\n", path);
1047
1048 pathlen = strlen(path);
1049 while ((dentry = readdir(dir))) {
1050 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1051 continue;
1052 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
1053 if (len >= sizeof(buf)) {
1054 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1055 (unsigned long)len, (unsigned long)sizeof(buf));
1056 continue;
1057 }
1058 sprintf(buf, "%s/%s", path, dentry->d_name);
1059 if (lstat(buf, &st) != -1) {
1060 if (S_ISREG(st.st_mode))
1061 scanelf_file(buf);
1062 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1063 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1064 scanelf_dir(buf);
1065 }
1066 }
1067 }
1068 closedir(dir);
1069 }
1070
1071 static int scanelf_from_file(char *filename)
1072 {
1073 FILE *fp = NULL;
1074 char *p;
1075 char path[__PAX_UTILS_PATH_MAX];
1076
1077 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL))
1078 fp = stdin;
1079 else if ((fp = fopen(filename, "r")) == NULL)
1080 return 1;
1081
1082 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1083 if ((p = strchr(path, '\n')) != NULL)
1084 *p = 0;
1085 search_path = path;
1086 scanelf_dir(path);
1087 }
1088 if (fp != stdin)
1089 fclose(fp);
1090 return 0;
1091 }
1092
1093 static void load_ld_so_conf()
1094 {
1095 FILE *fp = NULL;
1096 char *p;
1097 char path[__PAX_UTILS_PATH_MAX];
1098 int i = 0;
1099
1100 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL)
1101 return;
1102
1103 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1104 if (*path != '/')
1105 continue;
1106
1107 if ((p = strrchr(path, '\r')) != NULL)
1108 *p = 0;
1109 if ((p = strchr(path, '\n')) != NULL)
1110 *p = 0;
1111
1112 ldpaths[i++] = xstrdup(path);
1113
1114 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
1115 break;
1116 }
1117 ldpaths[i] = NULL;
1118
1119 fclose(fp);
1120 }
1121
1122 /* scan /etc/ld.so.conf for paths */
1123 static void scanelf_ldpath()
1124 {
1125 char scan_l, scan_ul, scan_ull;
1126 int i = 0;
1127
1128 if (!ldpaths[0])
1129 err("Unable to load any paths from ld.so.conf");
1130
1131 scan_l = scan_ul = scan_ull = 0;
1132
1133 while (ldpaths[i]) {
1134 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
1135 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
1136 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
1137 scanelf_dir(ldpaths[i]);
1138 ++i;
1139 }
1140
1141 if (!scan_l) scanelf_dir("/lib");
1142 if (!scan_ul) scanelf_dir("/usr/lib");
1143 if (!scan_ull) scanelf_dir("/usr/local/lib");
1144 }
1145
1146 /* scan env PATH for paths */
1147 static void scanelf_envpath()
1148 {
1149 char *path, *p;
1150
1151 path = getenv("PATH");
1152 if (!path)
1153 err("PATH is not set in your env !");
1154 path = xstrdup(path);
1155
1156 while ((p = strrchr(path, ':')) != NULL) {
1157 scanelf_dir(p + 1);
1158 *p = 0;
1159 }
1160
1161 free(path);
1162 }
1163
1164
1165 /* usage / invocation handling functions */
1166 #define PARSE_FLAGS "plRmyXxetrnLibSs:gN:TaqvF:f:o:BhV"
1167 #define a_argument required_argument
1168 static struct option const long_opts[] = {
1169 {"path", no_argument, NULL, 'p'},
1170 {"ldpath", no_argument, NULL, 'l'},
1171 {"recursive", no_argument, NULL, 'R'},
1172 {"mount", no_argument, NULL, 'm'},
1173 {"symlink", no_argument, NULL, 'y'},
1174 {"fix", no_argument, NULL, 'X'},
1175 {"pax", no_argument, NULL, 'x'},
1176 {"header", no_argument, NULL, 'e'},
1177 {"textrel", no_argument, NULL, 't'},
1178 {"rpath", no_argument, NULL, 'r'},
1179 {"needed", no_argument, NULL, 'n'},
1180 {"ldcache", no_argument, NULL, 'L'},
1181 {"interp", no_argument, NULL, 'i'},
1182 {"bind", no_argument, NULL, 'b'},
1183 {"soname", no_argument, NULL, 'S'},
1184 {"symbol", a_argument, NULL, 's'},
1185 {"lib", a_argument, NULL, 'N'},
1186 {"gmatch", no_argument, NULL, 'g'},
1187 {"textrels", no_argument, NULL, 'T'},
1188 {"all", no_argument, NULL, 'a'},
1189 {"quiet", no_argument, NULL, 'q'},
1190 {"verbose", no_argument, NULL, 'v'},
1191 {"format", a_argument, NULL, 'F'},
1192 {"from", a_argument, NULL, 'f'},
1193 {"file", a_argument, NULL, 'o'},
1194 {"nobanner", no_argument, NULL, 'B'},
1195 {"help", no_argument, NULL, 'h'},
1196 {"version", no_argument, NULL, 'V'},
1197 {NULL, no_argument, NULL, 0x0}
1198 };
1199
1200 static const char *opts_help[] = {
1201 "Scan all directories in PATH environment",
1202 "Scan all directories in /etc/ld.so.conf",
1203 "Scan directories recursively",
1204 "Don't recursively cross mount points",
1205 "Don't scan symlinks",
1206 "Try and 'fix' bad things (use with -r/-e)\n",
1207 "Print PaX markings",
1208 "Print GNU_STACK/PT_LOAD markings",
1209 "Print TEXTREL information",
1210 "Print RPATH information",
1211 "Print NEEDED information",
1212 "Utilize ld.so.cache information (use with -r/-n)",
1213 "Print INTERP information",
1214 "Print BIND information",
1215 "Print SONAME information",
1216 "Find a specified symbol",
1217 "Find a specified library",
1218 "Use strncmp to match libraries. (use with -N)",
1219 "Locate cause of TEXTREL",
1220 "Print all scanned info (-x -e -t -r -b)\n",
1221 "Only output 'bad' things",
1222 "Be verbose (can be specified more than once)",
1223 "Use specified format for output",
1224 "Read input stream from a filename",
1225 "Write output stream to a filename",
1226 "Don't display the header",
1227 "Print this help and exit",
1228 "Print version and exit",
1229 NULL
1230 };
1231
1232 /* display usage and exit */
1233 static void usage(int status)
1234 {
1235 unsigned long i;
1236 printf("* Scan ELF binaries for stuff\n\n"
1237 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0);
1238 printf("Options: -[%s]\n", PARSE_FLAGS);
1239 for (i = 0; long_opts[i].name; ++i)
1240 if (long_opts[i].has_arg == no_argument)
1241 printf(" -%c, --%-13s* %s\n", long_opts[i].val,
1242 long_opts[i].name, opts_help[i]);
1243 else
1244 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val,
1245 long_opts[i].name, opts_help[i]);
1246
1247 if (status != EXIT_SUCCESS)
1248 exit(status);
1249
1250 puts("\nThe format modifiers for the -F option are:");
1251 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1252 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1253 puts(" i INTERP \tb BIND \ts symbol");
1254 puts(" N library \to Type \tT TEXTRELs");
1255 puts(" S SONAME");
1256 puts(" p filename (with search path removed)");
1257 puts(" f filename (short name/basename)");
1258 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1259
1260 exit(status);
1261 }
1262
1263 /* parse command line arguments and preform needed actions */
1264 static void parseargs(int argc, char *argv[])
1265 {
1266 int i;
1267 char *from_file = NULL;
1268
1269 opterr = 0;
1270 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1271 switch (i) {
1272
1273 case 'V':
1274 printf("pax-utils-%s: %s compiled %s\n%s\n"
1275 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
1276 VERSION, __FILE__, __DATE__, rcsid, argv0);
1277 exit(EXIT_SUCCESS);
1278 break;
1279 case 'h': usage(EXIT_SUCCESS); break;
1280 case 'f':
1281 if (from_file) warn("You prob don't want to specify -f twice");
1282 from_file = optarg;
1283 break;
1284 case 'o': {
1285 FILE *fp = NULL;
1286 if ((fp = freopen(optarg, "w", stdout)) == NULL)
1287 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1288 SET_STDOUT(fp);
1289 break;
1290 }
1291
1292 case 's': {
1293 if (find_sym) warn("You prob don't want to specify -s twice");
1294 find_sym = optarg;
1295 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1296 sprintf(versioned_symname, "%s@", find_sym);
1297 break;
1298 }
1299 case 'N': {
1300 if (find_lib) warn("You prob don't want to specify -N twice");
1301 find_lib = optarg;
1302 break;
1303 }
1304
1305 case 'F': {
1306 if (out_format) warn("You prob don't want to specify -F twice");
1307 out_format = optarg;
1308 break;
1309 }
1310
1311 case 'g': gmatch = 1; /* break; any reason we dont breal; here ? */
1312 case 'L': use_ldcache = 1; break;
1313 case 'y': scan_symlink = 0; break;
1314 case 'B': show_banner = 0; break;
1315 case 'l': scan_ldpath = 1; break;
1316 case 'p': scan_envpath = 1; break;
1317 case 'R': dir_recurse = 1; break;
1318 case 'm': dir_crossmount = 0; break;
1319 case 'X': ++fix_elf; break;
1320 case 'x': show_pax = 1; break;
1321 case 'e': show_phdr = 1; break;
1322 case 't': show_textrel = 1; break;
1323 case 'r': show_rpath = 1; break;
1324 case 'n': show_needed = 1; break;
1325 case 'i': show_interp = 1; break;
1326 case 'b': show_bind = 1; break;
1327 case 'S': show_soname = 1; break;
1328 case 'T': show_textrels = 1; break;
1329 case 'q': be_quiet = 1; break;
1330 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1331 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
1332
1333 case ':':
1334 err("Option missing parameter\n");
1335 case '?':
1336 err("Unknown option\n");
1337 default:
1338 err("Unhandled option '%c'", i);
1339 }
1340 }
1341
1342 /* let the format option override all other options */
1343 if (out_format) {
1344 show_pax = show_phdr = show_textrel = show_rpath = \
1345 show_needed = show_interp = show_bind = show_soname = \
1346 show_textrels = 0;
1347 for (i = 0; out_format[i]; ++i) {
1348 if (!IS_MODIFIER(out_format[i])) continue;
1349
1350 switch (out_format[++i]) {
1351 case '%': break;
1352 case '#': break;
1353 case 'F': break;
1354 case 'p': break;
1355 case 'f': break;
1356 case 's': break;
1357 case 'N': break;
1358 case 'o': break;
1359 case 'x': show_pax = 1; break;
1360 case 'e': show_phdr = 1; break;
1361 case 't': show_textrel = 1; break;
1362 case 'r': show_rpath = 1; break;
1363 case 'n': show_needed = 1; break;
1364 case 'i': show_interp = 1; break;
1365 case 'b': show_bind = 1; break;
1366 case 'S': show_soname = 1; break;
1367 case 'T': show_textrels = 1; break;
1368 default:
1369 err("Invalid format specifier '%c' (byte %i)",
1370 out_format[i], i+1);
1371 }
1372 }
1373
1374 /* construct our default format */
1375 } else {
1376 size_t fmt_len = 30;
1377 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
1378 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1379 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1380 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1381 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1382 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1383 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1384 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1385 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1386 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1387 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1388 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1389 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1390 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1391 }
1392 if (be_verbose > 2) printf("Format: %s\n", out_format);
1393
1394 /* now lets actually do the scanning */
1395 if (scan_ldpath || use_ldcache)
1396 load_ld_so_conf();
1397 if (scan_ldpath) scanelf_ldpath();
1398 if (scan_envpath) scanelf_envpath();
1399 if (from_file) {
1400 scanelf_from_file(from_file);
1401 from_file = *argv;
1402 }
1403 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1404 err("Nothing to scan !?");
1405 while (optind < argc) {
1406 search_path = argv[optind++];
1407 scanelf_dir(search_path);
1408 }
1409
1410 /* clean up */
1411 if (versioned_symname) free(versioned_symname);
1412 for (i = 0; ldpaths[i]; ++i)
1413 free(ldpaths[i]);
1414
1415 if (ldcache != 0)
1416 munmap(ldcache, ldcache_size);
1417 }
1418
1419
1420
1421 /* utility funcs */
1422 static char *xstrdup(const char *s)
1423 {
1424 char *ret = strdup(s);
1425 if (!ret) err("Could not strdup(): %s", strerror(errno));
1426 return ret;
1427 }
1428 static void *xmalloc(size_t size)
1429 {
1430 void *ret = malloc(size);
1431 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1432 return ret;
1433 }
1434 static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
1435 {
1436 size_t new_len;
1437
1438 new_len = strlen(*dst) + strlen(src);
1439 if (*curr_len <= new_len) {
1440 *curr_len = new_len + (*curr_len / 2);
1441 *dst = realloc(*dst, *curr_len);
1442 if (!*dst)
1443 err("could not realloc() %li bytes", (unsigned long)*curr_len);
1444 }
1445
1446 if (n)
1447 strncat(*dst, src, n);
1448 else
1449 strcat(*dst, src);
1450 }
1451 static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1452 {
1453 static char my_app[2];
1454 my_app[0] = append;
1455 my_app[1] = '\0';
1456 xstrcat(dst, my_app, curr_len);
1457 }
1458
1459
1460
1461 int main(int argc, char *argv[])
1462 {
1463 if (argc < 2)
1464 usage(EXIT_FAILURE);
1465 parseargs(argc, argv);
1466 fclose(stdout);
1467 #ifdef __BOUNDS_CHECKING_ON
1468 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()");
1469 #endif
1470 return EXIT_SUCCESS;
1471 }

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