/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.107 - (show annotations) (download) (as text)
Wed Jan 18 22:28:46 2006 UTC (8 years, 9 months ago) by solar
Branch: MAIN
Changes since 1.106: +3 -3 lines
File MIME type: text/x-csrc
- dont write to memory when NULL rpaths exists and not using -X/--fix

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 1.106 2006/01/14 01:39:55 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 1.106 2006/01/14 01:39:55 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 SHOW_PHDR(B) \
158 if (elf->elf_class == ELFCLASS ## B) { \
159 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
160 Elf ## B ## _Off offset; \
161 uint32_t flags, check_flags; \
162 if (elf->phdr != NULL) { \
163 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
164 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
165 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
166 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
167 found = found_phdr; \
168 offset = 0; \
169 check_flags = PF_X; \
170 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
171 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
172 found = found_relro; \
173 offset = 4; \
174 check_flags = PF_X; \
175 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
176 if (multi_load++ > max_pt_load) warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
177 found = found_load; \
178 offset = 8; \
179 check_flags = PF_W|PF_X; \
180 } else \
181 continue; \
182 flags = EGET(phdr[i].p_flags); \
183 if (be_quiet && ((flags & check_flags) != check_flags)) \
184 continue; \
185 if (fix_elf && ((flags & PF_X) != flags)) { \
186 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
187 ret[3] = ret[7] = '!'; \
188 flags = EGET(phdr[i].p_flags); \
189 } \
190 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
191 *found = 1; \
192 ++shown; \
193 } \
194 } else if (elf->shdr != NULL) { \
195 /* no program headers which means this is prob an object file */ \
196 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
197 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
198 check_flags = SHF_WRITE|SHF_EXECINSTR; \
199 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
200 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
201 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
202 if (!strcmp((char*)(elf->data + offset), ".note.GNU-stack")) { \
203 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
204 flags = EGET(shdr[i].sh_flags); \
205 if (be_quiet && ((flags & check_flags) != check_flags)) \
206 continue; \
207 ++*found_phdr; \
208 shown = 1; \
209 if (flags & SHF_WRITE) ret[0] = 'W'; \
210 if (flags & SHF_ALLOC) ret[1] = 'A'; \
211 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
212 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
213 break; \
214 } \
215 } \
216 if (!multi_stack) { \
217 *found_phdr = 1; \
218 shown = 1; \
219 memcpy(ret, "!WX", 3); \
220 } \
221 } \
222 }
223 SHOW_PHDR(32)
224 SHOW_PHDR(64)
225
226 if (be_wewy_wewy_quiet || (be_quiet && !shown))
227 return NULL;
228 else
229 return ret;
230 }
231 static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
232 {
233 static const char *ret = "TEXTREL";
234 unsigned long i;
235
236 if (!show_textrel && !show_textrels) return NULL;
237
238 if (elf->phdr) {
239 #define SHOW_TEXTREL(B) \
240 if (elf->elf_class == ELFCLASS ## B) { \
241 Elf ## B ## _Dyn *dyn; \
242 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
243 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
244 Elf ## B ## _Off offset; \
245 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
246 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
247 offset = EGET(phdr[i].p_offset); \
248 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
249 dyn = DYN ## B (elf->data + offset); \
250 while (EGET(dyn->d_tag) != DT_NULL) { \
251 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
252 *found_textrel = 1; \
253 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
254 return (be_wewy_wewy_quiet ? NULL : ret); \
255 } \
256 ++dyn; \
257 } \
258 } }
259 SHOW_TEXTREL(32)
260 SHOW_TEXTREL(64)
261 }
262
263 if (be_quiet || be_wewy_wewy_quiet)
264 return NULL;
265 else
266 return " - ";
267 }
268 static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
269 {
270 unsigned long s, r, rmax;
271 void *symtab_void, *strtab_void, *text_void;
272
273 if (!show_textrels) return NULL;
274
275 /* don't search for TEXTREL's if the ELF doesn't have any */
276 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
277 if (!*found_textrel) return NULL;
278
279 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
280 text_void = elf_findsecbyname(elf, ".text");
281
282 if (symtab_void && strtab_void && text_void && elf->shdr) {
283 #define SHOW_TEXTRELS(B) \
284 if (elf->elf_class == ELFCLASS ## B) { \
285 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
286 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
287 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
288 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
289 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
290 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
291 uint ## B ## _t memsz = EGET(text->sh_size); \
292 Elf ## B ## _Rel *rel; \
293 Elf ## B ## _Rela *rela; \
294 /* search the section headers for relocations */ \
295 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
296 uint32_t sh_type = EGET(shdr[s].sh_type); \
297 if (sh_type == SHT_REL) { \
298 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \
299 rela = NULL; \
300 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
301 } else if (sh_type == SHT_RELA) { \
302 rel = NULL; \
303 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \
304 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
305 } else \
306 continue; \
307 /* now see if any of the relocs are in the .text */ \
308 for (r = 0; r < rmax; ++r) { \
309 unsigned long sym_max; \
310 Elf ## B ## _Addr offset_tmp; \
311 Elf ## B ## _Sym *func; \
312 Elf ## B ## _Sym *sym; \
313 Elf ## B ## _Addr r_offset; \
314 uint ## B ## _t r_info; \
315 if (sh_type == SHT_REL) { \
316 r_offset = EGET(rel[r].r_offset); \
317 r_info = EGET(rel[r].r_info); \
318 } else { \
319 r_offset = EGET(rela[r].r_offset); \
320 r_info = EGET(rela[r].r_info); \
321 } \
322 /* make sure this relocation is inside of the .text */ \
323 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
324 if (be_verbose <= 2) continue; \
325 } else \
326 *found_textrels = 1; \
327 /* locate this relocation symbol name */ \
328 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
329 sym_max = ELF ## B ## _R_SYM(r_info); \
330 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
331 sym += sym_max; \
332 else \
333 sym = NULL; \
334 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
335 /* show the raw details about this reloc */ \
336 printf(" %s: ", elf->base_filename); \
337 if (sym && sym->st_name) \
338 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \
339 else \
340 printf("(memory/fake?)"); \
341 printf(" [0x%lX]", (unsigned long)r_offset); \
342 /* now try to find the closest symbol that this rel is probably in */ \
343 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
344 func = NULL; \
345 offset_tmp = 0; \
346 while (sym_max--) { \
347 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
348 func = sym; \
349 offset_tmp = EGET(sym->st_value); \
350 } \
351 ++sym; \
352 } \
353 printf(" in "); \
354 if (func && func->st_name) \
355 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \
356 else \
357 printf("(NULL: fake?)"); \
358 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
359 } \
360 } }
361 SHOW_TEXTRELS(32)
362 SHOW_TEXTRELS(64)
363 }
364 if (!*found_textrels)
365 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
366
367 return NULL;
368 }
369
370 static void rpath_security_checks(elfobj *, char *, const char *);
371 static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
372 {
373 struct stat st;
374 switch (*item) {
375 case '/': break;
376 case '.':
377 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
378 break;
379 case ':':
380 case '\0':
381 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
382 break;
383 case '$':
384 if (fstat(elf->fd, &st) != -1)
385 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
386 warnf("Security problem with %s='%s' in %s with mode set of %o",
387 dt_type, item, elf->filename, st.st_mode & 07777);
388 break;
389 default:
390 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
391 break;
392 }
393 }
394 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
395 {
396 unsigned long i, s;
397 char *rpath, *runpath, **r;
398 void *strtbl_void;
399
400 if (!show_rpath) return;
401
402 strtbl_void = elf_findsecbyname(elf, ".dynstr");
403 rpath = runpath = NULL;
404
405 if (elf->phdr && strtbl_void) {
406 #define SHOW_RPATH(B) \
407 if (elf->elf_class == ELFCLASS ## B) { \
408 Elf ## B ## _Dyn *dyn; \
409 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
410 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
411 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
412 Elf ## B ## _Off offset; \
413 Elf ## B ## _Xword word; \
414 /* Scan all the program headers */ \
415 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
416 /* Just scan dynamic headers */ \
417 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
418 offset = EGET(phdr[i].p_offset); \
419 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
420 /* Just scan dynamic RPATH/RUNPATH headers */ \
421 dyn = DYN ## B (elf->data + offset); \
422 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
423 if (word == DT_RPATH) { \
424 r = &rpath; \
425 } else if (word == DT_RUNPATH) { \
426 r = &runpath; \
427 } else { \
428 ++dyn; \
429 continue; \
430 } \
431 /* Verify the memory is somewhat sane */ \
432 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
433 if (offset < (Elf ## B ## _Off)elf->len) { \
434 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
435 *r = (char*)(elf->data + offset); \
436 /* cache the length in case we need to nuke this section later on */ \
437 if (fix_elf) \
438 offset = strlen(*r); \
439 /* If quiet, don't output paths in ld.so.conf */ \
440 if (be_quiet) { \
441 size_t len; \
442 char *start, *end; \
443 /* note that we only 'chop' off leading known paths. */ \
444 /* since *r is read-only memory, we can only move the ptr forward. */ \
445 start = *r; \
446 /* scan each path in : delimited list */ \
447 while (start) { \
448 rpath_security_checks(elf, start, get_elfdtype(word)); \
449 end = strchr(start, ':'); \
450 len = (end ? abs(end - start) : strlen(start)); \
451 if (use_ldcache) \
452 for (s = 0; ldpaths[s]; ++s) \
453 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
454 *r = end; \
455 /* corner case ... if RPATH reads "/usr/lib:", we want \
456 * to show ':' rather than '' */ \
457 if (end && end[1] != '\0') \
458 (*r)++; \
459 break; \
460 } \
461 if (!*r || !end) \
462 break; \
463 else \
464 start = start + len + 1; \
465 } \
466 } \
467 if (*r) { \
468 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
469 /* just nuke it */ \
470 nuke_it##B: \
471 memset(*r, 0x00, offset); \
472 *r = NULL; \
473 ESET(dyn->d_tag, DT_DEBUG); \
474 ESET(dyn->d_un.d_ptr, 0); \
475 } else if (fix_elf) { \
476 /* try to clean "bad" paths */ \
477 size_t len, tmpdir_len; \
478 char *start, *end; \
479 const char *tmpdir; \
480 start = *r; \
481 tmpdir = (getenv("TMPDIR") ? : "."); \
482 tmpdir_len = strlen(tmpdir); \
483 while (1) { \
484 end = strchr(start, ':'); \
485 if (start == end) { \
486 eat_this_path##B: \
487 len = strlen(end); \
488 memmove(start, end+1, len); \
489 start[len-1] = '\0'; \
490 end = start - 1; \
491 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
492 if (!end) { \
493 if (start == *r) \
494 goto nuke_it##B; \
495 *--start = '\0'; \
496 } else \
497 goto eat_this_path##B; \
498 } \
499 if (!end) \
500 break; \
501 start = end + 1; \
502 } \
503 if (**r == '\0') \
504 goto nuke_it##B; \
505 } \
506 if (*r) \
507 *found_rpath = 1; \
508 } \
509 } \
510 ++dyn; \
511 } \
512 } }
513 SHOW_RPATH(32)
514 SHOW_RPATH(64)
515 }
516
517 if (be_wewy_wewy_quiet) return;
518
519 if (rpath && runpath) {
520 if (!strcmp(rpath, runpath)) {
521 xstrcat(ret, runpath, ret_len);
522 } else {
523 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
524 xchrcat(ret, '{', ret_len);
525 xstrcat(ret, rpath, ret_len);
526 xchrcat(ret, ',', ret_len);
527 xstrcat(ret, runpath, ret_len);
528 xchrcat(ret, '}', ret_len);
529 }
530 } else if (rpath || runpath)
531 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
532 else if (!be_quiet)
533 xstrcat(ret, " - ", ret_len);
534 }
535
536 #define LDSO_CACHE_MAGIC "ld.so-"
537 #define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
538 #define LDSO_CACHE_VER "1.7.0"
539 #define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
540 #define FLAG_ANY -1
541 #define FLAG_TYPE_MASK 0x00ff
542 #define FLAG_LIBC4 0x0000
543 #define FLAG_ELF 0x0001
544 #define FLAG_ELF_LIBC5 0x0002
545 #define FLAG_ELF_LIBC6 0x0003
546 #define FLAG_REQUIRED_MASK 0xff00
547 #define FLAG_SPARC_LIB64 0x0100
548 #define FLAG_IA64_LIB64 0x0200
549 #define FLAG_X8664_LIB64 0x0300
550 #define FLAG_S390_LIB64 0x0400
551 #define FLAG_POWERPC_LIB64 0x0500
552 #define FLAG_MIPS64_LIBN32 0x0600
553 #define FLAG_MIPS64_LIBN64 0x0700
554
555 static char *lookup_cache_lib(elfobj *, char *);
556 static char *lookup_cache_lib(elfobj *elf, char *fname)
557 {
558 int fd = 0;
559 char *strs;
560 static char buf[__PAX_UTILS_PATH_MAX] = "";
561 const char *cachefile = "/etc/ld.so.cache";
562 struct stat st;
563
564 typedef struct {
565 char magic[LDSO_CACHE_MAGIC_LEN];
566 char version[LDSO_CACHE_VER_LEN];
567 int nlibs;
568 } header_t;
569 header_t *header;
570
571 typedef struct {
572 int flags;
573 int sooffset;
574 int liboffset;
575 } libentry_t;
576 libentry_t *libent;
577
578 if (fname == NULL)
579 return NULL;
580
581 if (ldcache == 0) {
582 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1)
583 return NULL;
584
585 /* cache these values so we only map/unmap the cache file once */
586 ldcache_size = st.st_size;
587 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
588
589 close(fd);
590
591 if (ldcache == (caddr_t)-1)
592 return NULL;
593
594 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
595 return NULL;
596 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
597 return NULL;
598 }
599
600 header = (header_t *) ldcache;
601 libent = (libentry_t *) (ldcache + sizeof(header_t));
602 strs = (char *) &libent[header->nlibs];
603
604 for (fd = 0; fd < header->nlibs; fd++) {
605 /* this should be more fine grained, but for now we assume that
606 * diff arches will not be cached together. and we ignore the
607 * the different multilib mips cases. */
608 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
609 continue;
610 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
611 continue;
612
613 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
614 continue;
615 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
616 }
617 return buf;
618 }
619
620
621 static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
622 {
623 unsigned long i;
624 char *needed;
625 void *strtbl_void;
626 char *p;
627
628 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
629
630 strtbl_void = elf_findsecbyname(elf, ".dynstr");
631
632 if (elf->phdr && strtbl_void) {
633 #define SHOW_NEEDED(B) \
634 if (elf->elf_class == ELFCLASS ## B) { \
635 Elf ## B ## _Dyn *dyn; \
636 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
637 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
638 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
639 Elf ## B ## _Off offset; \
640 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
641 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
642 offset = EGET(phdr[i].p_offset); \
643 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
644 dyn = DYN ## B (elf->data + offset); \
645 while (EGET(dyn->d_tag) != DT_NULL) { \
646 if (EGET(dyn->d_tag) == DT_NEEDED) { \
647 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
648 if (offset >= (Elf ## B ## _Off)elf->len) { \
649 ++dyn; \
650 continue; \
651 } \
652 needed = (char*)(elf->data + offset); \
653 if (op == 0) { \
654 if (!be_wewy_wewy_quiet) { \
655 if (*found_needed) xchrcat(ret, ',', ret_len); \
656 if (use_ldcache) \
657 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
658 needed = p; \
659 xstrcat(ret, needed, ret_len); \
660 } \
661 *found_needed = 1; \
662 } else { \
663 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \
664 *found_lib = 1; \
665 return (be_wewy_wewy_quiet ? NULL : needed); \
666 } \
667 } \
668 } \
669 ++dyn; \
670 } \
671 } }
672 SHOW_NEEDED(32)
673 SHOW_NEEDED(64)
674 if (op == 0 && !*found_needed && be_verbose)
675 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
676 }
677
678 return NULL;
679 }
680 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
681 {
682 void *strtbl_void;
683
684 if (!show_interp) return NULL;
685
686 strtbl_void = elf_findsecbyname(elf, ".interp");
687
688 if (strtbl_void) {
689 #define SHOW_INTERP(B) \
690 if (elf->elf_class == ELFCLASS ## B) { \
691 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
692 *found_interp = 1; \
693 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
694 }
695 SHOW_INTERP(32)
696 SHOW_INTERP(64)
697 }
698 return NULL;
699 }
700 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
701 {
702 unsigned long i;
703 struct stat s;
704
705 if (!show_bind) return NULL;
706 if (!elf->phdr) return NULL;
707
708 #define SHOW_BIND(B) \
709 if (elf->elf_class == ELFCLASS ## B) { \
710 Elf ## B ## _Dyn *dyn; \
711 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
712 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
713 Elf ## B ## _Off offset; \
714 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
715 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
716 offset = EGET(phdr[i].p_offset); \
717 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
718 dyn = DYN ## B (elf->data + offset); \
719 while (EGET(dyn->d_tag) != DT_NULL) { \
720 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
721 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
722 { \
723 if (be_quiet) return NULL; \
724 *found_bind = 1; \
725 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
726 } \
727 ++dyn; \
728 } \
729 } \
730 }
731 SHOW_BIND(32)
732 SHOW_BIND(64)
733
734 if (be_wewy_wewy_quiet) return NULL;
735
736 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) {
737 return NULL;
738 } else {
739 *found_bind = 1;
740 return (char *) "LAZY";
741 }
742 }
743 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
744 {
745 unsigned long i;
746 char *soname;
747 void *strtbl_void;
748
749 if (!show_soname) return NULL;
750
751 strtbl_void = elf_findsecbyname(elf, ".dynstr");
752
753 if (elf->phdr && strtbl_void) {
754 #define SHOW_SONAME(B) \
755 if (elf->elf_class == ELFCLASS ## B) { \
756 Elf ## B ## _Dyn *dyn; \
757 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
758 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
759 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
760 Elf ## B ## _Off offset; \
761 /* only look for soname in shared objects */ \
762 if (ehdr->e_type != ET_DYN) \
763 return NULL; \
764 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
765 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
766 offset = EGET(phdr[i].p_offset); \
767 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
768 dyn = DYN ## B (elf->data + offset); \
769 while (EGET(dyn->d_tag) != DT_NULL) { \
770 if (EGET(dyn->d_tag) == DT_SONAME) { \
771 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
772 if (offset >= (Elf ## B ## _Off)elf->len) { \
773 ++dyn; \
774 continue; \
775 } \
776 soname = (char*)(elf->data + offset); \
777 *found_soname = 1; \
778 return (be_wewy_wewy_quiet ? NULL : soname); \
779 } \
780 ++dyn; \
781 } \
782 } }
783 SHOW_SONAME(32)
784 SHOW_SONAME(64)
785 }
786
787 return NULL;
788 }
789 static char *scanelf_file_sym(elfobj *elf, char *found_sym)
790 {
791 unsigned long i;
792 char *ret;
793 void *symtab_void, *strtab_void;
794
795 if (!find_sym) return NULL;
796 ret = find_sym;
797
798 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
799
800 if (symtab_void && strtab_void) {
801 #define FIND_SYM(B) \
802 if (elf->elf_class == ELFCLASS ## B) { \
803 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
804 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
805 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
806 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
807 char *symname; \
808 for (i = 0; i < cnt; ++i) { \
809 if (sym->st_name) { \
810 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
811 if (*find_sym == '*') { \
812 printf("%s(%s) %5lX %15s %s\n", \
813 ((*found_sym == 0) ? "\n\t" : "\t"), \
814 elf->base_filename, \
815 (unsigned long)sym->st_size, \
816 get_elfstttype(sym->st_info), \
817 symname); \
818 *found_sym = 1; \
819 } else { \
820 char *this_sym, *next_sym; \
821 this_sym = find_sym; \
822 do { \
823 next_sym = strchr(this_sym, ','); \
824 if (next_sym == NULL) \
825 next_sym = this_sym + strlen(this_sym); \
826 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
827 (strcmp(symname, versioned_symname) == 0)) { \
828 ret = this_sym; \
829 (*found_sym)++; \
830 goto break_out; \
831 } \
832 this_sym = next_sym + 1; \
833 } while (*next_sym != '\0'); \
834 } \
835 } \
836 ++sym; \
837 } }
838 FIND_SYM(32)
839 FIND_SYM(64)
840 }
841
842 break_out:
843 if (be_wewy_wewy_quiet) return NULL;
844
845 if (*find_sym != '*' && *found_sym)
846 return ret;
847 if (be_quiet)
848 return NULL;
849 else
850 return (char *)" - ";
851 }
852 /* scan an elf file and show all the fun stuff */
853 #define prints(str) write(fileno(stdout), str, strlen(str))
854 static int scanelf_elfobj(elfobj *elf)
855 {
856 unsigned long i;
857 char found_pax, found_phdr, found_relro, found_load, found_textrel,
858 found_rpath, found_needed, found_interp, found_bind, found_soname,
859 found_sym, found_lib, found_file, found_textrels;
860 static char *out_buffer = NULL;
861 static size_t out_len;
862
863 found_pax = found_phdr = found_relro = found_load = found_textrel = \
864 found_rpath = found_needed = found_interp = found_bind = found_soname = \
865 found_sym = found_lib = found_file = found_textrels = 0;
866
867 if (be_verbose > 1)
868 printf("%s: scanning file {%s,%s}\n", elf->filename,
869 get_elfeitype(EI_CLASS, elf->elf_class),
870 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
871 else if (be_verbose)
872 printf("%s: scanning file\n", elf->filename);
873
874 /* init output buffer */
875 if (!out_buffer) {
876 out_len = sizeof(char) * 80;
877 out_buffer = (char*)xmalloc(out_len);
878 }
879 *out_buffer = '\0';
880
881 /* show the header */
882 if (!be_quiet && show_banner) {
883 for (i = 0; out_format[i]; ++i) {
884 if (!IS_MODIFIER(out_format[i])) continue;
885
886 switch (out_format[++i]) {
887 case '%': break;
888 case '#': break;
889 case 'F':
890 case 'p':
891 case 'f': prints("FILE "); found_file = 1; break;
892 case 'o': prints(" TYPE "); break;
893 case 'x': prints(" PAX "); break;
894 case 'e': prints("STK/REL/PTL "); break;
895 case 't': prints("TEXTREL "); break;
896 case 'r': prints("RPATH "); break;
897 case 'n': prints("NEEDED "); break;
898 case 'i': prints("INTERP "); break;
899 case 'b': prints("BIND "); break;
900 case 'S': prints("SONAME "); break;
901 case 's': prints("SYM "); break;
902 case 'N': prints("LIB "); break;
903 case 'T': prints("TEXTRELS "); break;
904 default: warnf("'%c' has no title ?", out_format[i]);
905 }
906 }
907 if (!found_file) prints("FILE ");
908 prints("\n");
909 found_file = 0;
910 show_banner = 0;
911 }
912
913 /* dump all the good stuff */
914 for (i = 0; out_format[i]; ++i) {
915 const char *out;
916 const char *tmp;
917
918 /* make sure we trim leading spaces in quiet mode */
919 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
920 *out_buffer = '\0';
921
922 if (!IS_MODIFIER(out_format[i])) {
923 xchrcat(&out_buffer, out_format[i], &out_len);
924 continue;
925 }
926
927 out = NULL;
928 be_wewy_wewy_quiet = (out_format[i] == '#');
929 switch (out_format[++i]) {
930 case '%':
931 case '#':
932 xchrcat(&out_buffer, out_format[i], &out_len); break;
933 case 'F':
934 found_file = 1;
935 if (be_wewy_wewy_quiet) break;
936 xstrcat(&out_buffer, elf->filename, &out_len);
937 break;
938 case 'p':
939 found_file = 1;
940 if (be_wewy_wewy_quiet) break;
941 tmp = elf->filename;
942 if (search_path) {
943 ssize_t len_search = strlen(search_path);
944 ssize_t len_file = strlen(elf->filename);
945 if (!strncmp(elf->filename, search_path, len_search) && \
946 len_file > len_search)
947 tmp += len_search;
948 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
949 }
950 xstrcat(&out_buffer, tmp, &out_len);
951 break;
952 case 'f':
953 found_file = 1;
954 if (be_wewy_wewy_quiet) break;
955 tmp = strrchr(elf->filename, '/');
956 tmp = (tmp == NULL ? elf->filename : tmp+1);
957 xstrcat(&out_buffer, tmp, &out_len);
958 break;
959 case 'o': out = get_elfetype(elf); break;
960 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
961 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
962 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
963 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
964 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
965 case 'n':
966 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
967 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
968 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
969 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
970 case 's': out = scanelf_file_sym(elf, &found_sym); break;
971 default: warnf("'%c' has no scan code?", out_format[i]);
972 }
973 if (out) {
974 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
975 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
976 xstrncat(&out_buffer, out, &out_len, (tmp-out));
977 else
978 xstrcat(&out_buffer, out, &out_len);
979 }
980 }
981
982 #define FOUND_SOMETHING() \
983 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
984 found_rpath || found_needed || found_interp || found_bind || \
985 found_soname || found_sym || found_lib || found_textrels)
986
987 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
988 xchrcat(&out_buffer, ' ', &out_len);
989 xstrcat(&out_buffer, elf->filename, &out_len);
990 }
991 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
992 puts(out_buffer);
993 fflush(stdout);
994 }
995
996 return 0;
997 }
998
999 /* scan a single elf */
1000 static int scanelf_elf(const char *filename, int fd, size_t len)
1001 {
1002 int ret;
1003 elfobj *elf;
1004
1005 /* verify this is real ELF */
1006 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1007 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1008 return 1;
1009 }
1010
1011 ret = scanelf_elfobj(elf);
1012 unreadelf(elf);
1013 return ret;
1014 }
1015 /* scan an archive of elfs */
1016 static int scanelf_archive(const char *filename, int fd, size_t len)
1017 {
1018 archive_handle *ar;
1019 archive_member *m;
1020 char *ar_buffer;
1021 elfobj *elf;
1022
1023 ar = ar_open_fd(filename, fd);
1024 if (ar == NULL)
1025 return 1;
1026
1027 ar_buffer = (char*)mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1028 while ((m=ar_next(ar)) != NULL) {
1029 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size);
1030 if (elf) {
1031 scanelf_elfobj(elf);
1032 unreadelf(elf);
1033 }
1034 }
1035 munmap(ar_buffer, len);
1036
1037 return 0;
1038 }
1039 /* scan a file which may be an elf or an archive or some other magical beast */
1040 static void scanelf_file(const char *filename)
1041 {
1042 struct stat st;
1043 int fd;
1044
1045 /* make sure 'filename' exists */
1046 if (lstat(filename, &st) == -1) {
1047 if (be_verbose > 2) printf("%s: does not exist\n", filename);
1048 return;
1049 }
1050
1051 /* always handle regular files and handle symlinked files if no -y */
1052 if (S_ISLNK(st.st_mode)) {
1053 if (!scan_symlink) return;
1054 stat(filename, &st);
1055 }
1056 if (!S_ISREG(st.st_mode)) {
1057 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1058 return;
1059 }
1060
1061 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1062 return;
1063
1064 if (scanelf_elf(filename, fd, st.st_size) == 1 && scan_archives)
1065 /* if it isn't an ELF, maybe it's an .a archive */
1066 scanelf_archive(filename, fd, st.st_size);
1067
1068 close(fd);
1069 }
1070
1071 /* scan a directory for ET_EXEC files and print when we find one */
1072 static void scanelf_dir(const char *path)
1073 {
1074 register DIR *dir;
1075 register struct dirent *dentry;
1076 struct stat st_top, st;
1077 char buf[__PAX_UTILS_PATH_MAX];
1078 size_t pathlen = 0, len = 0;
1079
1080 /* make sure path exists */
1081 if (lstat(path, &st_top) == -1) {
1082 if (be_verbose > 2) printf("%s: does not exist\n", path);
1083 return;
1084 }
1085
1086 /* ok, if it isn't a directory, assume we can open it */
1087 if (!S_ISDIR(st_top.st_mode)) {
1088 scanelf_file(path);
1089 return;
1090 }
1091
1092 /* now scan the dir looking for fun stuff */
1093 if ((dir = opendir(path)) == NULL) {
1094 warnf("could not opendir %s: %s", path, strerror(errno));
1095 return;
1096 }
1097 if (be_verbose) printf("%s: scanning dir\n", path);
1098
1099 pathlen = strlen(path);
1100 while ((dentry = readdir(dir))) {
1101 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1102 continue;
1103 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
1104 if (len >= sizeof(buf)) {
1105 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1106 (unsigned long)len, (unsigned long)sizeof(buf));
1107 continue;
1108 }
1109 sprintf(buf, "%s/%s", path, dentry->d_name);
1110 if (lstat(buf, &st) != -1) {
1111 if (S_ISREG(st.st_mode))
1112 scanelf_file(buf);
1113 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1114 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1115 scanelf_dir(buf);
1116 }
1117 }
1118 }
1119 closedir(dir);
1120 }
1121
1122 static int scanelf_from_file(char *filename)
1123 {
1124 FILE *fp = NULL;
1125 char *p;
1126 char path[__PAX_UTILS_PATH_MAX];
1127
1128 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL))
1129 fp = stdin;
1130 else if ((fp = fopen(filename, "r")) == NULL)
1131 return 1;
1132
1133 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1134 if ((p = strchr(path, '\n')) != NULL)
1135 *p = 0;
1136 search_path = path;
1137 scanelf_dir(path);
1138 }
1139 if (fp != stdin)
1140 fclose(fp);
1141 return 0;
1142 }
1143
1144 static void load_ld_so_conf()
1145 {
1146 FILE *fp = NULL;
1147 char *p;
1148 char path[__PAX_UTILS_PATH_MAX];
1149 int i = 0;
1150
1151 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL)
1152 return;
1153
1154 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1155 if (*path != '/')
1156 continue;
1157
1158 if ((p = strrchr(path, '\r')) != NULL)
1159 *p = 0;
1160 if ((p = strchr(path, '\n')) != NULL)
1161 *p = 0;
1162
1163 ldpaths[i++] = xstrdup(path);
1164
1165 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
1166 break;
1167 }
1168 ldpaths[i] = NULL;
1169
1170 fclose(fp);
1171 }
1172
1173 /* scan /etc/ld.so.conf for paths */
1174 static void scanelf_ldpath()
1175 {
1176 char scan_l, scan_ul, scan_ull;
1177 int i = 0;
1178
1179 if (!ldpaths[0])
1180 err("Unable to load any paths from ld.so.conf");
1181
1182 scan_l = scan_ul = scan_ull = 0;
1183
1184 while (ldpaths[i]) {
1185 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
1186 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
1187 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
1188 scanelf_dir(ldpaths[i]);
1189 ++i;
1190 }
1191
1192 if (!scan_l) scanelf_dir("/lib");
1193 if (!scan_ul) scanelf_dir("/usr/lib");
1194 if (!scan_ull) scanelf_dir("/usr/local/lib");
1195 }
1196
1197 /* scan env PATH for paths */
1198 static void scanelf_envpath()
1199 {
1200 char *path, *p;
1201
1202 path = getenv("PATH");
1203 if (!path)
1204 err("PATH is not set in your env !");
1205 path = xstrdup(path);
1206
1207 while ((p = strrchr(path, ':')) != NULL) {
1208 scanelf_dir(p + 1);
1209 *p = 0;
1210 }
1211
1212 free(path);
1213 }
1214
1215
1216 /* usage / invocation handling functions */
1217 #define PARSE_FLAGS "plRmyAXxetrnLibSs:gN:TaqvF:f:o:BhV"
1218 #define a_argument required_argument
1219 static struct option const long_opts[] = {
1220 {"path", no_argument, NULL, 'p'},
1221 {"ldpath", no_argument, NULL, 'l'},
1222 {"recursive", no_argument, NULL, 'R'},
1223 {"mount", no_argument, NULL, 'm'},
1224 {"symlink", no_argument, NULL, 'y'},
1225 {"archives", no_argument, NULL, 'A'},
1226 {"ldcache", no_argument, NULL, 'L'},
1227 {"fix", no_argument, NULL, 'X'},
1228 {"pax", no_argument, NULL, 'x'},
1229 {"header", no_argument, NULL, 'e'},
1230 {"textrel", no_argument, NULL, 't'},
1231 {"rpath", no_argument, NULL, 'r'},
1232 {"needed", no_argument, NULL, 'n'},
1233 {"interp", no_argument, NULL, 'i'},
1234 {"bind", no_argument, NULL, 'b'},
1235 {"soname", no_argument, NULL, 'S'},
1236 {"symbol", a_argument, NULL, 's'},
1237 {"lib", a_argument, NULL, 'N'},
1238 {"gmatch", no_argument, NULL, 'g'},
1239 {"textrels", no_argument, NULL, 'T'},
1240 {"all", no_argument, NULL, 'a'},
1241 {"quiet", no_argument, NULL, 'q'},
1242 {"verbose", no_argument, NULL, 'v'},
1243 {"format", a_argument, NULL, 'F'},
1244 {"from", a_argument, NULL, 'f'},
1245 {"file", a_argument, NULL, 'o'},
1246 {"nobanner", no_argument, NULL, 'B'},
1247 {"help", no_argument, NULL, 'h'},
1248 {"version", no_argument, NULL, 'V'},
1249 {NULL, no_argument, NULL, 0x0}
1250 };
1251
1252 static const char *opts_help[] = {
1253 "Scan all directories in PATH environment",
1254 "Scan all directories in /etc/ld.so.conf",
1255 "Scan directories recursively",
1256 "Don't recursively cross mount points",
1257 "Don't scan symlinks",
1258 "Scan archives (.a files)",
1259 "Utilize ld.so.cache information (use with -r/-n)",
1260 "Try and 'fix' bad things (use with -r/-e)\n",
1261 "Print PaX markings",
1262 "Print GNU_STACK/PT_LOAD markings",
1263 "Print TEXTREL information",
1264 "Print RPATH information",
1265 "Print NEEDED information",
1266 "Print INTERP information",
1267 "Print BIND information",
1268 "Print SONAME information",
1269 "Find a specified symbol",
1270 "Find a specified library",
1271 "Use strncmp to match libraries. (use with -N)",
1272 "Locate cause of TEXTREL",
1273 "Print all scanned info (-x -e -t -r -b)\n",
1274 "Only output 'bad' things",
1275 "Be verbose (can be specified more than once)",
1276 "Use specified format for output",
1277 "Read input stream from a filename",
1278 "Write output stream to a filename",
1279 "Don't display the header",
1280 "Print this help and exit",
1281 "Print version and exit",
1282 NULL
1283 };
1284
1285 /* display usage and exit */
1286 static void usage(int status)
1287 {
1288 unsigned long i;
1289 printf("* Scan ELF binaries for stuff\n\n"
1290 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1291 printf("Options: -[%s]\n", PARSE_FLAGS);
1292 for (i = 0; long_opts[i].name; ++i)
1293 if (long_opts[i].has_arg == no_argument)
1294 printf(" -%c, --%-13s* %s\n", long_opts[i].val,
1295 long_opts[i].name, opts_help[i]);
1296 else
1297 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val,
1298 long_opts[i].name, opts_help[i]);
1299
1300 if (status != EXIT_SUCCESS)
1301 exit(status);
1302
1303 puts("\nThe format modifiers for the -F option are:");
1304 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1305 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1306 puts(" i INTERP \tb BIND \ts symbol");
1307 puts(" N library \to Type \tT TEXTRELs");
1308 puts(" S SONAME");
1309 puts(" p filename (with search path removed)");
1310 puts(" f filename (short name/basename)");
1311 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1312
1313 exit(status);
1314 }
1315
1316 /* parse command line arguments and preform needed actions */
1317 static void parseargs(int argc, char *argv[])
1318 {
1319 int i;
1320 char *from_file = NULL;
1321
1322 opterr = 0;
1323 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1324 switch (i) {
1325
1326 case 'V':
1327 printf("pax-utils-%s: %s compiled %s\n%s\n"
1328 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
1329 VERSION, __FILE__, __DATE__, rcsid, argv0);
1330 exit(EXIT_SUCCESS);
1331 break;
1332 case 'h': usage(EXIT_SUCCESS); break;
1333 case 'f':
1334 if (from_file) warn("You prob don't want to specify -f twice");
1335 from_file = optarg;
1336 break;
1337 case 'o': {
1338 FILE *fp = NULL;
1339 if ((fp = freopen(optarg, "w", stdout)) == NULL)
1340 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1341 SET_STDOUT(fp);
1342 break;
1343 }
1344
1345 case 's': {
1346 if (find_sym) warn("You prob don't want to specify -s twice");
1347 find_sym = optarg;
1348 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1349 sprintf(versioned_symname, "%s@", find_sym);
1350 break;
1351 }
1352 case 'N': {
1353 if (find_lib) warn("You prob don't want to specify -N twice");
1354 find_lib = optarg;
1355 break;
1356 }
1357
1358 case 'F': {
1359 if (out_format) warn("You prob don't want to specify -F twice");
1360 out_format = optarg;
1361 break;
1362 }
1363
1364 case 'g': gmatch = 1; /* break; any reason we dont breal; here ? */
1365 case 'L': use_ldcache = 1; break;
1366 case 'y': scan_symlink = 0; break;
1367 case 'A': scan_archives = 1; break;
1368 case 'B': show_banner = 0; break;
1369 case 'l': scan_ldpath = 1; break;
1370 case 'p': scan_envpath = 1; break;
1371 case 'R': dir_recurse = 1; break;
1372 case 'm': dir_crossmount = 0; break;
1373 case 'X': ++fix_elf; break;
1374 case 'x': show_pax = 1; break;
1375 case 'e': show_phdr = 1; break;
1376 case 't': show_textrel = 1; break;
1377 case 'r': show_rpath = 1; break;
1378 case 'n': show_needed = 1; break;
1379 case 'i': show_interp = 1; break;
1380 case 'b': show_bind = 1; break;
1381 case 'S': show_soname = 1; break;
1382 case 'T': show_textrels = 1; break;
1383 case 'q': be_quiet = 1; break;
1384 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1385 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
1386
1387 case ':':
1388 err("Option missing parameter\n");
1389 case '?':
1390 err("Unknown option\n");
1391 default:
1392 err("Unhandled option '%c'", i);
1393 }
1394 }
1395
1396 /* let the format option override all other options */
1397 if (out_format) {
1398 show_pax = show_phdr = show_textrel = show_rpath = \
1399 show_needed = show_interp = show_bind = show_soname = \
1400 show_textrels = 0;
1401 for (i = 0; out_format[i]; ++i) {
1402 if (!IS_MODIFIER(out_format[i])) continue;
1403
1404 switch (out_format[++i]) {
1405 case '%': break;
1406 case '#': break;
1407 case 'F': break;
1408 case 'p': break;
1409 case 'f': break;
1410 case 's': break;
1411 case 'N': break;
1412 case 'o': break;
1413 case 'x': show_pax = 1; break;
1414 case 'e': show_phdr = 1; break;
1415 case 't': show_textrel = 1; break;
1416 case 'r': show_rpath = 1; break;
1417 case 'n': show_needed = 1; break;
1418 case 'i': show_interp = 1; break;
1419 case 'b': show_bind = 1; break;
1420 case 'S': show_soname = 1; break;
1421 case 'T': show_textrels = 1; break;
1422 default:
1423 err("Invalid format specifier '%c' (byte %i)",
1424 out_format[i], i+1);
1425 }
1426 }
1427
1428 /* construct our default format */
1429 } else {
1430 size_t fmt_len = 30;
1431 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
1432 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1433 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1434 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1435 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1436 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1437 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1438 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1439 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1440 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1441 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1442 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1443 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1444 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1445 }
1446 if (be_verbose > 2) printf("Format: %s\n", out_format);
1447
1448 /* now lets actually do the scanning */
1449 if (scan_ldpath || use_ldcache)
1450 load_ld_so_conf();
1451 if (scan_ldpath) scanelf_ldpath();
1452 if (scan_envpath) scanelf_envpath();
1453 if (from_file) {
1454 scanelf_from_file(from_file);
1455 from_file = *argv;
1456 }
1457 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1458 err("Nothing to scan !?");
1459 while (optind < argc) {
1460 search_path = argv[optind++];
1461 scanelf_dir(search_path);
1462 }
1463
1464 /* clean up */
1465 if (versioned_symname) free(versioned_symname);
1466 for (i = 0; ldpaths[i]; ++i)
1467 free(ldpaths[i]);
1468
1469 if (ldcache != 0)
1470 munmap(ldcache, ldcache_size);
1471 }
1472
1473
1474
1475 /* utility funcs */
1476 static char *xstrdup(const char *s)
1477 {
1478 char *ret = strdup(s);
1479 if (!ret) err("Could not strdup(): %s", strerror(errno));
1480 return ret;
1481 }
1482 static void *xmalloc(size_t size)
1483 {
1484 void *ret = malloc(size);
1485 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1486 return ret;
1487 }
1488 static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
1489 {
1490 size_t new_len;
1491
1492 new_len = strlen(*dst) + strlen(src);
1493 if (*curr_len <= new_len) {
1494 *curr_len = new_len + (*curr_len / 2);
1495 *dst = realloc(*dst, *curr_len);
1496 if (!*dst)
1497 err("could not realloc() %li bytes", (unsigned long)*curr_len);
1498 }
1499
1500 if (n)
1501 strncat(*dst, src, n);
1502 else
1503 strcat(*dst, src);
1504 }
1505 static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1506 {
1507 static char my_app[2];
1508 my_app[0] = append;
1509 my_app[1] = '\0';
1510 xstrcat(dst, my_app, curr_len);
1511 }
1512
1513
1514
1515 int main(int argc, char *argv[])
1516 {
1517 if (argc < 2)
1518 usage(EXIT_FAILURE);
1519 parseargs(argc, argv);
1520 fclose(stdout);
1521 #ifdef __BOUNDS_CHECKING_ON
1522 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()");
1523 #endif
1524 return EXIT_SUCCESS;
1525 }

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