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Revision 1.112 - (show annotations) (download) (as text)
Tue Jan 24 00:30:36 2006 UTC (8 years, 5 months ago) by vapier
Branch: MAIN
Changes since 1.111: +3 -3 lines
File MIME type: text/x-csrc
previous fix actually broke symbol scanning

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 1.111 2006/01/20 00:23:32 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 1.111 2006/01/20 00:23:32 vapier 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 *ldpaths[256];
37 static char scan_ldpath = 0;
38 static char scan_envpath = 0;
39 static char scan_symlink = 1;
40 static char scan_archives = 0;
41 static char dir_recurse = 0;
42 static char dir_crossmount = 1;
43 static char show_pax = 0;
44 static char show_phdr = 0;
45 static char show_textrel = 0;
46 static char show_rpath = 0;
47 static char show_needed = 0;
48 static char show_interp = 0;
49 static char show_bind = 0;
50 static char show_soname = 0;
51 static char show_textrels = 0;
52 static char show_banner = 1;
53 static char be_quiet = 0;
54 static char be_verbose = 0;
55 static char be_wewy_wewy_quiet = 0;
56 static char *find_sym = NULL, *versioned_symname = NULL;
57 static char *find_lib = NULL;
58 static char *out_format = NULL;
59 static char *search_path = NULL;
60 static char fix_elf = 0;
61 static char gmatch = 0;
62 static char use_ldcache = 0;
63
64
65 caddr_t ldcache = 0;
66 size_t ldcache_size = 0;
67
68 /* sub-funcs for scanelf_file() */
69 static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
70 {
71 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
72 #define GET_SYMTABS(B) \
73 if (elf->elf_class == ELFCLASS ## B) { \
74 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
75 /* debug sections */ \
76 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
77 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
78 /* runtime sections */ \
79 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
80 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
81 if (symtab && dynsym) { \
82 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \
83 } else { \
84 *sym = (void*)(symtab ? symtab : dynsym); \
85 } \
86 if (strtab && dynstr) { \
87 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \
88 } else { \
89 *tab = (void*)(strtab ? strtab : dynstr); \
90 } \
91 }
92 GET_SYMTABS(32)
93 GET_SYMTABS(64)
94 }
95 static char *scanelf_file_pax(elfobj *elf, char *found_pax)
96 {
97 static char ret[7];
98 unsigned long i, shown;
99
100 if (!show_pax) return NULL;
101
102 shown = 0;
103 memset(&ret, 0, sizeof(ret));
104
105 if (elf->phdr) {
106 #define SHOW_PAX(B) \
107 if (elf->elf_class == ELFCLASS ## B) { \
108 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
109 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
110 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
111 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
112 continue; \
113 if (be_quiet && (EGET(phdr[i].p_flags) == 10240)) \
114 continue; \
115 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
116 *found_pax = 1; \
117 ++shown; \
118 break; \
119 } \
120 }
121 SHOW_PAX(32)
122 SHOW_PAX(64)
123 }
124
125 /* fall back to EI_PAX if no PT_PAX was found */
126 if (!*ret) {
127 static char *paxflags;
128 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
129 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
130 *found_pax = 1;
131 return (be_wewy_wewy_quiet ? NULL : paxflags);
132 }
133 strncpy(ret, paxflags, sizeof(ret));
134 }
135
136 if (be_wewy_wewy_quiet || (be_quiet && !shown))
137 return NULL;
138 else
139 return ret;
140 }
141
142 static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
143 {
144 static char ret[12];
145 char *found;
146 unsigned long i, shown, multi_stack, multi_relro, multi_load;
147 int max_pt_load;
148
149 if (!show_phdr) return NULL;
150
151 memcpy(ret, "--- --- ---\0", 12);
152
153 shown = 0;
154 multi_stack = multi_relro = multi_load = 0;
155 max_pt_load = elf_max_pt_load(elf);
156
157 #define NOTE_GNU_STACK ".note.GNU-stack"
158 #define SHOW_PHDR(B) \
159 if (elf->elf_class == ELFCLASS ## B) { \
160 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
161 Elf ## B ## _Off offset; \
162 uint32_t flags, check_flags; \
163 if (elf->phdr != NULL) { \
164 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
165 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
166 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
167 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
168 found = found_phdr; \
169 offset = 0; \
170 check_flags = PF_X; \
171 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
172 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
173 found = found_relro; \
174 offset = 4; \
175 check_flags = PF_X; \
176 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
177 if (multi_load++ > max_pt_load) warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
178 found = found_load; \
179 offset = 8; \
180 check_flags = PF_W|PF_X; \
181 } else \
182 continue; \
183 flags = EGET(phdr[i].p_flags); \
184 if (be_quiet && ((flags & check_flags) != check_flags)) \
185 continue; \
186 if (fix_elf && ((flags & PF_X) != flags)) { \
187 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
188 ret[3] = ret[7] = '!'; \
189 flags = EGET(phdr[i].p_flags); \
190 } \
191 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
192 *found = 1; \
193 ++shown; \
194 } \
195 } else if (elf->shdr != NULL) { \
196 /* no program headers which means this is prob an object file */ \
197 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
198 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
199 char *str; \
200 if ((void*)strtbl > (void*)(elf->data + sizeof(*strtbl))) \
201 goto skip_this_shdr##B; \
202 check_flags = SHF_WRITE|SHF_EXECINSTR; \
203 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
204 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
205 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
206 str = elf->data + offset; \
207 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
208 if (!strcmp(str, NOTE_GNU_STACK)) { \
209 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
210 flags = EGET(shdr[i].sh_flags); \
211 if (be_quiet && ((flags & check_flags) != check_flags)) \
212 continue; \
213 ++*found_phdr; \
214 shown = 1; \
215 if (flags & SHF_WRITE) ret[0] = 'W'; \
216 if (flags & SHF_ALLOC) ret[1] = 'A'; \
217 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
218 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
219 break; \
220 } \
221 } \
222 skip_this_shdr##B: \
223 if (!multi_stack) { \
224 *found_phdr = 1; \
225 shown = 1; \
226 memcpy(ret, "!WX", 3); \
227 } \
228 } \
229 }
230 SHOW_PHDR(32)
231 SHOW_PHDR(64)
232
233 if (be_wewy_wewy_quiet || (be_quiet && !shown))
234 return NULL;
235 else
236 return ret;
237 }
238 static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
239 {
240 static const char *ret = "TEXTREL";
241 unsigned long i;
242
243 if (!show_textrel && !show_textrels) return NULL;
244
245 if (elf->phdr) {
246 #define SHOW_TEXTREL(B) \
247 if (elf->elf_class == ELFCLASS ## B) { \
248 Elf ## B ## _Dyn *dyn; \
249 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
250 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
251 Elf ## B ## _Off offset; \
252 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
253 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
254 offset = EGET(phdr[i].p_offset); \
255 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
256 dyn = DYN ## B (elf->data + offset); \
257 while (EGET(dyn->d_tag) != DT_NULL) { \
258 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
259 *found_textrel = 1; \
260 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
261 return (be_wewy_wewy_quiet ? NULL : ret); \
262 } \
263 ++dyn; \
264 } \
265 } }
266 SHOW_TEXTREL(32)
267 SHOW_TEXTREL(64)
268 }
269
270 if (be_quiet || be_wewy_wewy_quiet)
271 return NULL;
272 else
273 return " - ";
274 }
275 static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
276 {
277 unsigned long s, r, rmax;
278 void *symtab_void, *strtab_void, *text_void;
279
280 if (!show_textrels) return NULL;
281
282 /* don't search for TEXTREL's if the ELF doesn't have any */
283 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
284 if (!*found_textrel) return NULL;
285
286 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
287 text_void = elf_findsecbyname(elf, ".text");
288
289 if (symtab_void && strtab_void && text_void && elf->shdr) {
290 #define SHOW_TEXTRELS(B) \
291 if (elf->elf_class == ELFCLASS ## B) { \
292 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
293 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
294 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
295 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
296 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
297 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
298 uint ## B ## _t memsz = EGET(text->sh_size); \
299 Elf ## B ## _Rel *rel; \
300 Elf ## B ## _Rela *rela; \
301 /* search the section headers for relocations */ \
302 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
303 uint32_t sh_type = EGET(shdr[s].sh_type); \
304 if (sh_type == SHT_REL) { \
305 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \
306 rela = NULL; \
307 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
308 } else if (sh_type == SHT_RELA) { \
309 rel = NULL; \
310 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \
311 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
312 } else \
313 continue; \
314 /* now see if any of the relocs are in the .text */ \
315 for (r = 0; r < rmax; ++r) { \
316 unsigned long sym_max; \
317 Elf ## B ## _Addr offset_tmp; \
318 Elf ## B ## _Sym *func; \
319 Elf ## B ## _Sym *sym; \
320 Elf ## B ## _Addr r_offset; \
321 uint ## B ## _t r_info; \
322 if (sh_type == SHT_REL) { \
323 r_offset = EGET(rel[r].r_offset); \
324 r_info = EGET(rel[r].r_info); \
325 } else { \
326 r_offset = EGET(rela[r].r_offset); \
327 r_info = EGET(rela[r].r_info); \
328 } \
329 /* make sure this relocation is inside of the .text */ \
330 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
331 if (be_verbose <= 2) continue; \
332 } else \
333 *found_textrels = 1; \
334 /* locate this relocation symbol name */ \
335 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
336 if ((void*)sym > (void*)elf->data_end) { \
337 warn("%s: corrupt ELF symbol", elf->filename); \
338 continue; \
339 } \
340 sym_max = ELF ## B ## _R_SYM(r_info); \
341 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
342 sym += sym_max; \
343 else \
344 sym = NULL; \
345 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
346 /* show the raw details about this reloc */ \
347 printf(" %s: ", elf->base_filename); \
348 if (sym && sym->st_name) \
349 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \
350 else \
351 printf("(memory/fake?)"); \
352 printf(" [0x%lX]", (unsigned long)r_offset); \
353 /* now try to find the closest symbol that this rel is probably in */ \
354 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
355 func = NULL; \
356 offset_tmp = 0; \
357 while (sym_max--) { \
358 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
359 func = sym; \
360 offset_tmp = EGET(sym->st_value); \
361 } \
362 ++sym; \
363 } \
364 printf(" in "); \
365 if (func && func->st_name) \
366 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \
367 else \
368 printf("(NULL: fake?)"); \
369 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
370 } \
371 } }
372 SHOW_TEXTRELS(32)
373 SHOW_TEXTRELS(64)
374 }
375 if (!*found_textrels)
376 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
377
378 return NULL;
379 }
380
381 static void rpath_security_checks(elfobj *, char *, const char *);
382 static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
383 {
384 struct stat st;
385 switch (*item) {
386 case '/': break;
387 case '.':
388 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
389 break;
390 case ':':
391 case '\0':
392 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
393 break;
394 case '$':
395 if (fstat(elf->fd, &st) != -1)
396 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
397 warnf("Security problem with %s='%s' in %s with mode set of %o",
398 dt_type, item, elf->filename, st.st_mode & 07777);
399 break;
400 default:
401 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
402 break;
403 }
404 }
405 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
406 {
407 unsigned long i, s;
408 char *rpath, *runpath, **r;
409 void *strtbl_void;
410
411 if (!show_rpath) return;
412
413 strtbl_void = elf_findsecbyname(elf, ".dynstr");
414 rpath = runpath = NULL;
415
416 if (elf->phdr && strtbl_void) {
417 #define SHOW_RPATH(B) \
418 if (elf->elf_class == ELFCLASS ## B) { \
419 Elf ## B ## _Dyn *dyn; \
420 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
421 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
422 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
423 Elf ## B ## _Off offset; \
424 Elf ## B ## _Xword word; \
425 /* Scan all the program headers */ \
426 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
427 /* Just scan dynamic headers */ \
428 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
429 offset = EGET(phdr[i].p_offset); \
430 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
431 /* Just scan dynamic RPATH/RUNPATH headers */ \
432 dyn = DYN ## B (elf->data + offset); \
433 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
434 if (word == DT_RPATH) { \
435 r = &rpath; \
436 } else if (word == DT_RUNPATH) { \
437 r = &runpath; \
438 } else { \
439 ++dyn; \
440 continue; \
441 } \
442 /* Verify the memory is somewhat sane */ \
443 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
444 if (offset < (Elf ## B ## _Off)elf->len) { \
445 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
446 *r = (char*)(elf->data + offset); \
447 /* cache the length in case we need to nuke this section later on */ \
448 if (fix_elf) \
449 offset = strlen(*r); \
450 /* If quiet, don't output paths in ld.so.conf */ \
451 if (be_quiet) { \
452 size_t len; \
453 char *start, *end; \
454 /* note that we only 'chop' off leading known paths. */ \
455 /* since *r is read-only memory, we can only move the ptr forward. */ \
456 start = *r; \
457 /* scan each path in : delimited list */ \
458 while (start) { \
459 rpath_security_checks(elf, start, get_elfdtype(word)); \
460 end = strchr(start, ':'); \
461 len = (end ? abs(end - start) : strlen(start)); \
462 if (use_ldcache) \
463 for (s = 0; ldpaths[s]; ++s) \
464 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
465 *r = end; \
466 /* corner case ... if RPATH reads "/usr/lib:", we want \
467 * to show ':' rather than '' */ \
468 if (end && end[1] != '\0') \
469 (*r)++; \
470 break; \
471 } \
472 if (!*r || !end) \
473 break; \
474 else \
475 start = start + len + 1; \
476 } \
477 } \
478 if (*r) { \
479 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
480 /* just nuke it */ \
481 nuke_it##B: \
482 memset(*r, 0x00, offset); \
483 *r = NULL; \
484 ESET(dyn->d_tag, DT_DEBUG); \
485 ESET(dyn->d_un.d_ptr, 0); \
486 } else if (fix_elf) { \
487 /* try to clean "bad" paths */ \
488 size_t len, tmpdir_len; \
489 char *start, *end; \
490 const char *tmpdir; \
491 start = *r; \
492 tmpdir = (getenv("TMPDIR") ? : "."); \
493 tmpdir_len = strlen(tmpdir); \
494 while (1) { \
495 end = strchr(start, ':'); \
496 if (start == end) { \
497 eat_this_path##B: \
498 len = strlen(end); \
499 memmove(start, end+1, len); \
500 start[len-1] = '\0'; \
501 end = start - 1; \
502 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
503 if (!end) { \
504 if (start == *r) \
505 goto nuke_it##B; \
506 *--start = '\0'; \
507 } else \
508 goto eat_this_path##B; \
509 } \
510 if (!end) \
511 break; \
512 start = end + 1; \
513 } \
514 if (**r == '\0') \
515 goto nuke_it##B; \
516 } \
517 if (*r) \
518 *found_rpath = 1; \
519 } \
520 } \
521 ++dyn; \
522 } \
523 } }
524 SHOW_RPATH(32)
525 SHOW_RPATH(64)
526 }
527
528 if (be_wewy_wewy_quiet) return;
529
530 if (rpath && runpath) {
531 if (!strcmp(rpath, runpath)) {
532 xstrcat(ret, runpath, ret_len);
533 } else {
534 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
535 xchrcat(ret, '{', ret_len);
536 xstrcat(ret, rpath, ret_len);
537 xchrcat(ret, ',', ret_len);
538 xstrcat(ret, runpath, ret_len);
539 xchrcat(ret, '}', ret_len);
540 }
541 } else if (rpath || runpath)
542 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
543 else if (!be_quiet)
544 xstrcat(ret, " - ", ret_len);
545 }
546
547 #define LDSO_CACHE_MAGIC "ld.so-"
548 #define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
549 #define LDSO_CACHE_VER "1.7.0"
550 #define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
551 #define FLAG_ANY -1
552 #define FLAG_TYPE_MASK 0x00ff
553 #define FLAG_LIBC4 0x0000
554 #define FLAG_ELF 0x0001
555 #define FLAG_ELF_LIBC5 0x0002
556 #define FLAG_ELF_LIBC6 0x0003
557 #define FLAG_REQUIRED_MASK 0xff00
558 #define FLAG_SPARC_LIB64 0x0100
559 #define FLAG_IA64_LIB64 0x0200
560 #define FLAG_X8664_LIB64 0x0300
561 #define FLAG_S390_LIB64 0x0400
562 #define FLAG_POWERPC_LIB64 0x0500
563 #define FLAG_MIPS64_LIBN32 0x0600
564 #define FLAG_MIPS64_LIBN64 0x0700
565
566 static char *lookup_cache_lib(elfobj *, char *);
567 static char *lookup_cache_lib(elfobj *elf, char *fname)
568 {
569 int fd = 0;
570 char *strs;
571 static char buf[__PAX_UTILS_PATH_MAX] = "";
572 const char *cachefile = "/etc/ld.so.cache";
573 struct stat st;
574
575 typedef struct {
576 char magic[LDSO_CACHE_MAGIC_LEN];
577 char version[LDSO_CACHE_VER_LEN];
578 int nlibs;
579 } header_t;
580 header_t *header;
581
582 typedef struct {
583 int flags;
584 int sooffset;
585 int liboffset;
586 } libentry_t;
587 libentry_t *libent;
588
589 if (fname == NULL)
590 return NULL;
591
592 if (ldcache == 0) {
593 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1)
594 return NULL;
595
596 /* cache these values so we only map/unmap the cache file once */
597 ldcache_size = st.st_size;
598 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
599
600 close(fd);
601
602 if (ldcache == (caddr_t)-1)
603 return NULL;
604
605 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
606 return NULL;
607 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
608 return NULL;
609 }
610
611 header = (header_t *) ldcache;
612 libent = (libentry_t *) (ldcache + sizeof(header_t));
613 strs = (char *) &libent[header->nlibs];
614
615 for (fd = 0; fd < header->nlibs; fd++) {
616 /* this should be more fine grained, but for now we assume that
617 * diff arches will not be cached together. and we ignore the
618 * the different multilib mips cases. */
619 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
620 continue;
621 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
622 continue;
623
624 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
625 continue;
626 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
627 }
628 return buf;
629 }
630
631
632 static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
633 {
634 unsigned long i;
635 char *needed;
636 void *strtbl_void;
637 char *p;
638
639 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
640
641 strtbl_void = elf_findsecbyname(elf, ".dynstr");
642
643 if (elf->phdr && strtbl_void) {
644 #define SHOW_NEEDED(B) \
645 if (elf->elf_class == ELFCLASS ## B) { \
646 Elf ## B ## _Dyn *dyn; \
647 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
648 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
649 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
650 Elf ## B ## _Off offset; \
651 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
652 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
653 offset = EGET(phdr[i].p_offset); \
654 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
655 dyn = DYN ## B (elf->data + offset); \
656 while (EGET(dyn->d_tag) != DT_NULL) { \
657 if (EGET(dyn->d_tag) == DT_NEEDED) { \
658 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
659 if (offset >= (Elf ## B ## _Off)elf->len) { \
660 ++dyn; \
661 continue; \
662 } \
663 needed = (char*)(elf->data + offset); \
664 if (op == 0) { \
665 if (!be_wewy_wewy_quiet) { \
666 if (*found_needed) xchrcat(ret, ',', ret_len); \
667 if (use_ldcache) \
668 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
669 needed = p; \
670 xstrcat(ret, needed, ret_len); \
671 } \
672 *found_needed = 1; \
673 } else { \
674 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \
675 *found_lib = 1; \
676 return (be_wewy_wewy_quiet ? NULL : needed); \
677 } \
678 } \
679 } \
680 ++dyn; \
681 } \
682 } }
683 SHOW_NEEDED(32)
684 SHOW_NEEDED(64)
685 if (op == 0 && !*found_needed && be_verbose)
686 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
687 }
688
689 return NULL;
690 }
691 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
692 {
693 void *strtbl_void;
694
695 if (!show_interp) return NULL;
696
697 strtbl_void = elf_findsecbyname(elf, ".interp");
698
699 if (strtbl_void) {
700 #define SHOW_INTERP(B) \
701 if (elf->elf_class == ELFCLASS ## B) { \
702 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
703 *found_interp = 1; \
704 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
705 }
706 SHOW_INTERP(32)
707 SHOW_INTERP(64)
708 }
709 return NULL;
710 }
711 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
712 {
713 unsigned long i;
714 struct stat s;
715
716 if (!show_bind) return NULL;
717 if (!elf->phdr) return NULL;
718
719 #define SHOW_BIND(B) \
720 if (elf->elf_class == ELFCLASS ## B) { \
721 Elf ## B ## _Dyn *dyn; \
722 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
723 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
724 Elf ## B ## _Off offset; \
725 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
726 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
727 offset = EGET(phdr[i].p_offset); \
728 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
729 dyn = DYN ## B (elf->data + offset); \
730 while (EGET(dyn->d_tag) != DT_NULL) { \
731 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
732 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
733 { \
734 if (be_quiet) return NULL; \
735 *found_bind = 1; \
736 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
737 } \
738 ++dyn; \
739 } \
740 } \
741 }
742 SHOW_BIND(32)
743 SHOW_BIND(64)
744
745 if (be_wewy_wewy_quiet) return NULL;
746
747 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) {
748 return NULL;
749 } else {
750 *found_bind = 1;
751 return (char *) "LAZY";
752 }
753 }
754 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
755 {
756 unsigned long i;
757 char *soname;
758 void *strtbl_void;
759
760 if (!show_soname) return NULL;
761
762 strtbl_void = elf_findsecbyname(elf, ".dynstr");
763
764 if (elf->phdr && strtbl_void) {
765 #define SHOW_SONAME(B) \
766 if (elf->elf_class == ELFCLASS ## B) { \
767 Elf ## B ## _Dyn *dyn; \
768 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
769 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
770 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
771 Elf ## B ## _Off offset; \
772 /* only look for soname in shared objects */ \
773 if (ehdr->e_type != ET_DYN) \
774 return NULL; \
775 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
776 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
777 offset = EGET(phdr[i].p_offset); \
778 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
779 dyn = DYN ## B (elf->data + offset); \
780 while (EGET(dyn->d_tag) != DT_NULL) { \
781 if (EGET(dyn->d_tag) == DT_SONAME) { \
782 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
783 if (offset >= (Elf ## B ## _Off)elf->len) { \
784 ++dyn; \
785 continue; \
786 } \
787 soname = (char*)(elf->data + offset); \
788 *found_soname = 1; \
789 return (be_wewy_wewy_quiet ? NULL : soname); \
790 } \
791 ++dyn; \
792 } \
793 } }
794 SHOW_SONAME(32)
795 SHOW_SONAME(64)
796 }
797
798 return NULL;
799 }
800 static char *scanelf_file_sym(elfobj *elf, char *found_sym)
801 {
802 unsigned long i;
803 char *ret;
804 void *symtab_void, *strtab_void;
805
806 if (!find_sym) return NULL;
807 ret = find_sym;
808
809 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
810
811 if (symtab_void && strtab_void) {
812 #define FIND_SYM(B) \
813 if (elf->elf_class == ELFCLASS ## B) { \
814 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
815 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
816 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
817 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
818 char *symname; \
819 for (i = 0; i < cnt; ++i) { \
820 if (sym->st_name) { \
821 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
822 if ((void*)symname > (void*)elf->data) { \
823 warn("%s: corrupt ELF symbols", elf->filename); \
824 continue; \
825 } \
826 if (*find_sym == '*') { \
827 printf("%s(%s) %5lX %15s %s\n", \
828 ((*found_sym == 0) ? "\n\t" : "\t"), \
829 elf->base_filename, \
830 (unsigned long)sym->st_size, \
831 get_elfstttype(sym->st_info), \
832 symname); \
833 *found_sym = 1; \
834 } else { \
835 char *this_sym, *next_sym; \
836 this_sym = find_sym; \
837 do { \
838 next_sym = strchr(this_sym, ','); \
839 if (next_sym == NULL) \
840 next_sym = this_sym + strlen(this_sym); \
841 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
842 (strcmp(symname, versioned_symname) == 0)) { \
843 ret = this_sym; \
844 (*found_sym)++; \
845 goto break_out; \
846 } \
847 this_sym = next_sym + 1; \
848 } while (*next_sym != '\0'); \
849 } \
850 } \
851 ++sym; \
852 } }
853 FIND_SYM(32)
854 FIND_SYM(64)
855 }
856
857 break_out:
858 if (be_wewy_wewy_quiet) return NULL;
859
860 if (*find_sym != '*' && *found_sym)
861 return ret;
862 if (be_quiet)
863 return NULL;
864 else
865 return (char *)" - ";
866 }
867 /* scan an elf file and show all the fun stuff */
868 #define prints(str) write(fileno(stdout), str, strlen(str))
869 static int scanelf_elfobj(elfobj *elf)
870 {
871 unsigned long i;
872 char found_pax, found_phdr, found_relro, found_load, found_textrel,
873 found_rpath, found_needed, found_interp, found_bind, found_soname,
874 found_sym, found_lib, found_file, found_textrels;
875 static char *out_buffer = NULL;
876 static size_t out_len;
877
878 found_pax = found_phdr = found_relro = found_load = found_textrel = \
879 found_rpath = found_needed = found_interp = found_bind = found_soname = \
880 found_sym = found_lib = found_file = found_textrels = 0;
881
882 if (be_verbose > 1)
883 printf("%s: scanning file {%s,%s}\n", elf->filename,
884 get_elfeitype(EI_CLASS, elf->elf_class),
885 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
886 else if (be_verbose)
887 printf("%s: scanning file\n", elf->filename);
888
889 /* init output buffer */
890 if (!out_buffer) {
891 out_len = sizeof(char) * 80;
892 out_buffer = (char*)xmalloc(out_len);
893 }
894 *out_buffer = '\0';
895
896 /* show the header */
897 if (!be_quiet && show_banner) {
898 for (i = 0; out_format[i]; ++i) {
899 if (!IS_MODIFIER(out_format[i])) continue;
900
901 switch (out_format[++i]) {
902 case '%': break;
903 case '#': break;
904 case 'F':
905 case 'p':
906 case 'f': prints("FILE "); found_file = 1; break;
907 case 'o': prints(" TYPE "); break;
908 case 'x': prints(" PAX "); break;
909 case 'e': prints("STK/REL/PTL "); break;
910 case 't': prints("TEXTREL "); break;
911 case 'r': prints("RPATH "); break;
912 case 'n': prints("NEEDED "); break;
913 case 'i': prints("INTERP "); break;
914 case 'b': prints("BIND "); break;
915 case 'S': prints("SONAME "); break;
916 case 's': prints("SYM "); break;
917 case 'N': prints("LIB "); break;
918 case 'T': prints("TEXTRELS "); break;
919 default: warnf("'%c' has no title ?", out_format[i]);
920 }
921 }
922 if (!found_file) prints("FILE ");
923 prints("\n");
924 found_file = 0;
925 show_banner = 0;
926 }
927
928 /* dump all the good stuff */
929 for (i = 0; out_format[i]; ++i) {
930 const char *out;
931 const char *tmp;
932
933 /* make sure we trim leading spaces in quiet mode */
934 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
935 *out_buffer = '\0';
936
937 if (!IS_MODIFIER(out_format[i])) {
938 xchrcat(&out_buffer, out_format[i], &out_len);
939 continue;
940 }
941
942 out = NULL;
943 be_wewy_wewy_quiet = (out_format[i] == '#');
944 switch (out_format[++i]) {
945 case '%':
946 case '#':
947 xchrcat(&out_buffer, out_format[i], &out_len); break;
948 case 'F':
949 found_file = 1;
950 if (be_wewy_wewy_quiet) break;
951 xstrcat(&out_buffer, elf->filename, &out_len);
952 break;
953 case 'p':
954 found_file = 1;
955 if (be_wewy_wewy_quiet) break;
956 tmp = elf->filename;
957 if (search_path) {
958 ssize_t len_search = strlen(search_path);
959 ssize_t len_file = strlen(elf->filename);
960 if (!strncmp(elf->filename, search_path, len_search) && \
961 len_file > len_search)
962 tmp += len_search;
963 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
964 }
965 xstrcat(&out_buffer, tmp, &out_len);
966 break;
967 case 'f':
968 found_file = 1;
969 if (be_wewy_wewy_quiet) break;
970 tmp = strrchr(elf->filename, '/');
971 tmp = (tmp == NULL ? elf->filename : tmp+1);
972 xstrcat(&out_buffer, tmp, &out_len);
973 break;
974 case 'o': out = get_elfetype(elf); break;
975 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
976 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
977 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
978 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
979 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
980 case 'n':
981 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
982 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
983 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
984 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
985 case 's': out = scanelf_file_sym(elf, &found_sym); break;
986 default: warnf("'%c' has no scan code?", out_format[i]);
987 }
988 if (out) {
989 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
990 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
991 xstrncat(&out_buffer, out, &out_len, (tmp-out));
992 else
993 xstrcat(&out_buffer, out, &out_len);
994 }
995 }
996
997 #define FOUND_SOMETHING() \
998 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
999 found_rpath || found_needed || found_interp || found_bind || \
1000 found_soname || found_sym || found_lib || found_textrels)
1001
1002 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1003 xchrcat(&out_buffer, ' ', &out_len);
1004 xstrcat(&out_buffer, elf->filename, &out_len);
1005 }
1006 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
1007 puts(out_buffer);
1008 fflush(stdout);
1009 }
1010
1011 return 0;
1012 }
1013
1014 /* scan a single elf */
1015 static int scanelf_elf(const char *filename, int fd, size_t len)
1016 {
1017 int ret;
1018 elfobj *elf;
1019
1020 /* verify this is real ELF */
1021 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1022 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1023 return 1;
1024 }
1025
1026 ret = scanelf_elfobj(elf);
1027 unreadelf(elf);
1028 return ret;
1029 }
1030 /* scan an archive of elfs */
1031 static int scanelf_archive(const char *filename, int fd, size_t len)
1032 {
1033 archive_handle *ar;
1034 archive_member *m;
1035 char *ar_buffer;
1036 elfobj *elf;
1037
1038 ar = ar_open_fd(filename, fd);
1039 if (ar == NULL)
1040 return 1;
1041
1042 ar_buffer = (char*)mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1043 while ((m=ar_next(ar)) != NULL) {
1044 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size);
1045 if (elf) {
1046 scanelf_elfobj(elf);
1047 unreadelf(elf);
1048 }
1049 }
1050 munmap(ar_buffer, len);
1051
1052 return 0;
1053 }
1054 /* scan a file which may be an elf or an archive or some other magical beast */
1055 static void scanelf_file(const char *filename)
1056 {
1057 struct stat st;
1058 int fd;
1059
1060 /* make sure 'filename' exists */
1061 if (lstat(filename, &st) == -1) {
1062 if (be_verbose > 2) printf("%s: does not exist\n", filename);
1063 return;
1064 }
1065
1066 /* always handle regular files and handle symlinked files if no -y */
1067 if (S_ISLNK(st.st_mode)) {
1068 if (!scan_symlink) return;
1069 stat(filename, &st);
1070 }
1071 if (!S_ISREG(st.st_mode)) {
1072 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1073 return;
1074 }
1075
1076 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1077 return;
1078
1079 if (scanelf_elf(filename, fd, st.st_size) == 1 && scan_archives)
1080 /* if it isn't an ELF, maybe it's an .a archive */
1081 scanelf_archive(filename, fd, st.st_size);
1082
1083 close(fd);
1084 }
1085
1086 /* scan a directory for ET_EXEC files and print when we find one */
1087 static void scanelf_dir(const char *path)
1088 {
1089 register DIR *dir;
1090 register struct dirent *dentry;
1091 struct stat st_top, st;
1092 char buf[__PAX_UTILS_PATH_MAX];
1093 size_t pathlen = 0, len = 0;
1094
1095 /* make sure path exists */
1096 if (lstat(path, &st_top) == -1) {
1097 if (be_verbose > 2) printf("%s: does not exist\n", path);
1098 return;
1099 }
1100
1101 /* ok, if it isn't a directory, assume we can open it */
1102 if (!S_ISDIR(st_top.st_mode)) {
1103 scanelf_file(path);
1104 return;
1105 }
1106
1107 /* now scan the dir looking for fun stuff */
1108 if ((dir = opendir(path)) == NULL) {
1109 warnf("could not opendir %s: %s", path, strerror(errno));
1110 return;
1111 }
1112 if (be_verbose) printf("%s: scanning dir\n", path);
1113
1114 pathlen = strlen(path);
1115 while ((dentry = readdir(dir))) {
1116 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1117 continue;
1118 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
1119 if (len >= sizeof(buf)) {
1120 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1121 (unsigned long)len, (unsigned long)sizeof(buf));
1122 continue;
1123 }
1124 sprintf(buf, "%s/%s", path, dentry->d_name);
1125 if (lstat(buf, &st) != -1) {
1126 if (S_ISREG(st.st_mode))
1127 scanelf_file(buf);
1128 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1129 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1130 scanelf_dir(buf);
1131 }
1132 }
1133 }
1134 closedir(dir);
1135 }
1136
1137 static int scanelf_from_file(char *filename)
1138 {
1139 FILE *fp = NULL;
1140 char *p;
1141 char path[__PAX_UTILS_PATH_MAX];
1142
1143 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL))
1144 fp = stdin;
1145 else if ((fp = fopen(filename, "r")) == NULL)
1146 return 1;
1147
1148 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1149 if ((p = strchr(path, '\n')) != NULL)
1150 *p = 0;
1151 search_path = path;
1152 scanelf_dir(path);
1153 }
1154 if (fp != stdin)
1155 fclose(fp);
1156 return 0;
1157 }
1158
1159 static void load_ld_so_conf()
1160 {
1161 FILE *fp = NULL;
1162 char *p;
1163 char path[__PAX_UTILS_PATH_MAX];
1164 int i = 0;
1165
1166 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL)
1167 return;
1168
1169 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1170 if (*path != '/')
1171 continue;
1172
1173 if ((p = strrchr(path, '\r')) != NULL)
1174 *p = 0;
1175 if ((p = strchr(path, '\n')) != NULL)
1176 *p = 0;
1177
1178 ldpaths[i++] = xstrdup(path);
1179
1180 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
1181 break;
1182 }
1183 ldpaths[i] = NULL;
1184
1185 fclose(fp);
1186 }
1187
1188 /* scan /etc/ld.so.conf for paths */
1189 static void scanelf_ldpath()
1190 {
1191 char scan_l, scan_ul, scan_ull;
1192 int i = 0;
1193
1194 if (!ldpaths[0])
1195 err("Unable to load any paths from ld.so.conf");
1196
1197 scan_l = scan_ul = scan_ull = 0;
1198
1199 while (ldpaths[i]) {
1200 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
1201 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
1202 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
1203 scanelf_dir(ldpaths[i]);
1204 ++i;
1205 }
1206
1207 if (!scan_l) scanelf_dir("/lib");
1208 if (!scan_ul) scanelf_dir("/usr/lib");
1209 if (!scan_ull) scanelf_dir("/usr/local/lib");
1210 }
1211
1212 /* scan env PATH for paths */
1213 static void scanelf_envpath()
1214 {
1215 char *path, *p;
1216
1217 path = getenv("PATH");
1218 if (!path)
1219 err("PATH is not set in your env !");
1220 path = xstrdup(path);
1221
1222 while ((p = strrchr(path, ':')) != NULL) {
1223 scanelf_dir(p + 1);
1224 *p = 0;
1225 }
1226
1227 free(path);
1228 }
1229
1230
1231 /* usage / invocation handling functions */
1232 #define PARSE_FLAGS "plRmyAXxetrnLibSs:gN:TaqvF:f:o:BhV"
1233 #define a_argument required_argument
1234 static struct option const long_opts[] = {
1235 {"path", no_argument, NULL, 'p'},
1236 {"ldpath", no_argument, NULL, 'l'},
1237 {"recursive", no_argument, NULL, 'R'},
1238 {"mount", no_argument, NULL, 'm'},
1239 {"symlink", no_argument, NULL, 'y'},
1240 {"archives", no_argument, NULL, 'A'},
1241 {"ldcache", no_argument, NULL, 'L'},
1242 {"fix", no_argument, NULL, 'X'},
1243 {"pax", no_argument, NULL, 'x'},
1244 {"header", no_argument, NULL, 'e'},
1245 {"textrel", no_argument, NULL, 't'},
1246 {"rpath", no_argument, NULL, 'r'},
1247 {"needed", no_argument, NULL, 'n'},
1248 {"interp", no_argument, NULL, 'i'},
1249 {"bind", no_argument, NULL, 'b'},
1250 {"soname", no_argument, NULL, 'S'},
1251 {"symbol", a_argument, NULL, 's'},
1252 {"lib", a_argument, NULL, 'N'},
1253 {"gmatch", no_argument, NULL, 'g'},
1254 {"textrels", no_argument, NULL, 'T'},
1255 {"all", no_argument, NULL, 'a'},
1256 {"quiet", no_argument, NULL, 'q'},
1257 {"verbose", no_argument, NULL, 'v'},
1258 {"format", a_argument, NULL, 'F'},
1259 {"from", a_argument, NULL, 'f'},
1260 {"file", a_argument, NULL, 'o'},
1261 {"nobanner", no_argument, NULL, 'B'},
1262 {"help", no_argument, NULL, 'h'},
1263 {"version", no_argument, NULL, 'V'},
1264 {NULL, no_argument, NULL, 0x0}
1265 };
1266
1267 static const char *opts_help[] = {
1268 "Scan all directories in PATH environment",
1269 "Scan all directories in /etc/ld.so.conf",
1270 "Scan directories recursively",
1271 "Don't recursively cross mount points",
1272 "Don't scan symlinks",
1273 "Scan archives (.a files)",
1274 "Utilize ld.so.cache information (use with -r/-n)",
1275 "Try and 'fix' bad things (use with -r/-e)\n",
1276 "Print PaX markings",
1277 "Print GNU_STACK/PT_LOAD markings",
1278 "Print TEXTREL information",
1279 "Print RPATH information",
1280 "Print NEEDED information",
1281 "Print INTERP information",
1282 "Print BIND information",
1283 "Print SONAME information",
1284 "Find a specified symbol",
1285 "Find a specified library",
1286 "Use strncmp to match libraries. (use with -N)",
1287 "Locate cause of TEXTREL",
1288 "Print all scanned info (-x -e -t -r -b)\n",
1289 "Only output 'bad' things",
1290 "Be verbose (can be specified more than once)",
1291 "Use specified format for output",
1292 "Read input stream from a filename",
1293 "Write output stream to a filename",
1294 "Don't display the header",
1295 "Print this help and exit",
1296 "Print version and exit",
1297 NULL
1298 };
1299
1300 /* display usage and exit */
1301 static void usage(int status)
1302 {
1303 unsigned long i;
1304 printf("* Scan ELF binaries for stuff\n\n"
1305 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1306 printf("Options: -[%s]\n", PARSE_FLAGS);
1307 for (i = 0; long_opts[i].name; ++i)
1308 if (long_opts[i].has_arg == no_argument)
1309 printf(" -%c, --%-13s* %s\n", long_opts[i].val,
1310 long_opts[i].name, opts_help[i]);
1311 else
1312 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val,
1313 long_opts[i].name, opts_help[i]);
1314
1315 if (status != EXIT_SUCCESS)
1316 exit(status);
1317
1318 puts("\nThe format modifiers for the -F option are:");
1319 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1320 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1321 puts(" i INTERP \tb BIND \ts symbol");
1322 puts(" N library \to Type \tT TEXTRELs");
1323 puts(" S SONAME");
1324 puts(" p filename (with search path removed)");
1325 puts(" f filename (short name/basename)");
1326 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1327
1328 exit(status);
1329 }
1330
1331 /* parse command line arguments and preform needed actions */
1332 static void parseargs(int argc, char *argv[])
1333 {
1334 int i;
1335 char *from_file = NULL;
1336
1337 opterr = 0;
1338 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1339 switch (i) {
1340
1341 case 'V':
1342 printf("pax-utils-%s: %s compiled %s\n%s\n"
1343 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
1344 VERSION, __FILE__, __DATE__, rcsid, argv0);
1345 exit(EXIT_SUCCESS);
1346 break;
1347 case 'h': usage(EXIT_SUCCESS); break;
1348 case 'f':
1349 if (from_file) warn("You prob don't want to specify -f twice");
1350 from_file = optarg;
1351 break;
1352 case 'o': {
1353 FILE *fp = NULL;
1354 if ((fp = freopen(optarg, "w", stdout)) == NULL)
1355 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1356 SET_STDOUT(fp);
1357 break;
1358 }
1359
1360 case 's': {
1361 if (find_sym) warn("You prob don't want to specify -s twice");
1362 find_sym = optarg;
1363 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1364 sprintf(versioned_symname, "%s@", find_sym);
1365 break;
1366 }
1367 case 'N': {
1368 if (find_lib) warn("You prob don't want to specify -N twice");
1369 find_lib = optarg;
1370 break;
1371 }
1372
1373 case 'F': {
1374 if (out_format) warn("You prob don't want to specify -F twice");
1375 out_format = optarg;
1376 break;
1377 }
1378
1379 case 'g': gmatch = 1; /* break; any reason we dont breal; here ? */
1380 case 'L': use_ldcache = 1; break;
1381 case 'y': scan_symlink = 0; break;
1382 case 'A': scan_archives = 1; break;
1383 case 'B': show_banner = 0; break;
1384 case 'l': scan_ldpath = 1; break;
1385 case 'p': scan_envpath = 1; break;
1386 case 'R': dir_recurse = 1; break;
1387 case 'm': dir_crossmount = 0; break;
1388 case 'X': ++fix_elf; break;
1389 case 'x': show_pax = 1; break;
1390 case 'e': show_phdr = 1; break;
1391 case 't': show_textrel = 1; break;
1392 case 'r': show_rpath = 1; break;
1393 case 'n': show_needed = 1; break;
1394 case 'i': show_interp = 1; break;
1395 case 'b': show_bind = 1; break;
1396 case 'S': show_soname = 1; break;
1397 case 'T': show_textrels = 1; break;
1398 case 'q': be_quiet = 1; break;
1399 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1400 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
1401
1402 case ':':
1403 err("Option missing parameter\n");
1404 case '?':
1405 err("Unknown option\n");
1406 default:
1407 err("Unhandled option '%c'", i);
1408 }
1409 }
1410
1411 /* let the format option override all other options */
1412 if (out_format) {
1413 show_pax = show_phdr = show_textrel = show_rpath = \
1414 show_needed = show_interp = show_bind = show_soname = \
1415 show_textrels = 0;
1416 for (i = 0; out_format[i]; ++i) {
1417 if (!IS_MODIFIER(out_format[i])) continue;
1418
1419 switch (out_format[++i]) {
1420 case '%': break;
1421 case '#': break;
1422 case 'F': break;
1423 case 'p': break;
1424 case 'f': break;
1425 case 's': break;
1426 case 'N': break;
1427 case 'o': break;
1428 case 'x': show_pax = 1; break;
1429 case 'e': show_phdr = 1; break;
1430 case 't': show_textrel = 1; break;
1431 case 'r': show_rpath = 1; break;
1432 case 'n': show_needed = 1; break;
1433 case 'i': show_interp = 1; break;
1434 case 'b': show_bind = 1; break;
1435 case 'S': show_soname = 1; break;
1436 case 'T': show_textrels = 1; break;
1437 default:
1438 err("Invalid format specifier '%c' (byte %i)",
1439 out_format[i], i+1);
1440 }
1441 }
1442
1443 /* construct our default format */
1444 } else {
1445 size_t fmt_len = 30;
1446 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
1447 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1448 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1449 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1450 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1451 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1452 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1453 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1454 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1455 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1456 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1457 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1458 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1459 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1460 }
1461 if (be_verbose > 2) printf("Format: %s\n", out_format);
1462
1463 /* now lets actually do the scanning */
1464 if (scan_ldpath || use_ldcache)
1465 load_ld_so_conf();
1466 if (scan_ldpath) scanelf_ldpath();
1467 if (scan_envpath) scanelf_envpath();
1468 if (from_file) {
1469 scanelf_from_file(from_file);
1470 from_file = *argv;
1471 }
1472 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1473 err("Nothing to scan !?");
1474 while (optind < argc) {
1475 search_path = argv[optind++];
1476 scanelf_dir(search_path);
1477 }
1478
1479 /* clean up */
1480 if (versioned_symname) free(versioned_symname);
1481 for (i = 0; ldpaths[i]; ++i)
1482 free(ldpaths[i]);
1483
1484 if (ldcache != 0)
1485 munmap(ldcache, ldcache_size);
1486 }
1487
1488
1489
1490 /* utility funcs */
1491 static char *xstrdup(const char *s)
1492 {
1493 char *ret = strdup(s);
1494 if (!ret) err("Could not strdup(): %s", strerror(errno));
1495 return ret;
1496 }
1497 static void *xmalloc(size_t size)
1498 {
1499 void *ret = malloc(size);
1500 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1501 return ret;
1502 }
1503 static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
1504 {
1505 size_t new_len;
1506
1507 new_len = strlen(*dst) + strlen(src);
1508 if (*curr_len <= new_len) {
1509 *curr_len = new_len + (*curr_len / 2);
1510 *dst = realloc(*dst, *curr_len);
1511 if (!*dst)
1512 err("could not realloc() %li bytes", (unsigned long)*curr_len);
1513 }
1514
1515 if (n)
1516 strncat(*dst, src, n);
1517 else
1518 strcat(*dst, src);
1519 }
1520 static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1521 {
1522 static char my_app[2];
1523 my_app[0] = append;
1524 my_app[1] = '\0';
1525 xstrcat(dst, my_app, curr_len);
1526 }
1527
1528
1529
1530 int main(int argc, char *argv[])
1531 {
1532 if (argc < 2)
1533 usage(EXIT_FAILURE);
1534 parseargs(argc, argv);
1535 fclose(stdout);
1536 #ifdef __BOUNDS_CHECKING_ON
1537 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()");
1538 #endif
1539 return EXIT_SUCCESS;
1540 }

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