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Revision 1.162 - (show annotations) (download) (as text)
Tue Nov 28 04:01:04 2006 UTC (7 years, 11 months ago) by vapier
Branch: MAIN
Changes since 1.161: +5 -5 lines
File MIME type: text/x-csrc
just whitespace

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 1.161 2006/11/28 03:55:57 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 1.161 2006/11/28 03:55:57 vapier Exp $";
13 #define argv0 "scanelf"
14
15 #define IS_MODIFIER(c) (c == '%' || c == '#' || c == '+')
16
17 #define do_state(option, flag) \
18 if (islower(option)) { \
19 flags &= ~PF_##flag; \
20 flags |= PF_NO##flag; \
21 } else { \
22 flags &= ~PF_NO##flag; \
23 flags |= PF_##flag; \
24 }
25
26
27 /* prototypes */
28 static int file_matches_list(const char *filename, char **matchlist);
29 static int scanelf_elfobj(elfobj *elf);
30 static int scanelf_elf(const char *filename, int fd, size_t len);
31 static int scanelf_archive(const char *filename, int fd, size_t len);
32 static void scanelf_file(const char *filename, const struct stat *st_cache);
33 static void scanelf_dir(const char *path);
34 static void scanelf_ldpath(void);
35 static void scanelf_envpath(void);
36 static void usage(int status);
37 static char **get_split_env(const char *envvar);
38 static void parseenv(void);
39 static void parseargs(int argc, char *argv[]);
40 static char *xstrdup(const char *s);
41 static void *xmalloc(size_t size);
42 static void *xrealloc(void *ptr, size_t size);
43 static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n);
44 #define xstrcat(dst,src,curr_len) xstrncat(dst,src,curr_len,0)
45 static inline void xchrcat(char **dst, const char append, size_t *curr_len);
46
47 /* variables to control behavior */
48 static char match_etypes[126] = "";
49 static char *ldpaths[256];
50 static char scan_ldpath = 0;
51 static char scan_envpath = 0;
52 static char scan_symlink = 1;
53 static char scan_archives = 0;
54 static char dir_recurse = 0;
55 static char dir_crossmount = 1;
56 static char show_pax = 0;
57 static char show_phdr = 0;
58 static char show_textrel = 0;
59 static char show_rpath = 0;
60 static char show_needed = 0;
61 static char show_interp = 0;
62 static char show_bind = 0;
63 static char show_soname = 0;
64 static char show_textrels = 0;
65 static char show_banner = 1;
66 static char be_quiet = 0;
67 static char be_verbose = 0;
68 static char be_wewy_wewy_quiet = 0;
69 static char be_semi_verbose = 0;
70 static char *find_sym = NULL, *versioned_symname = NULL;
71 static char *find_lib = NULL;
72 static char *find_section = NULL;
73 static char *out_format = NULL;
74 static char *search_path = NULL;
75 static char fix_elf = 0;
76 static char gmatch = 0;
77 static char use_ldcache = 0;
78
79 static char **qa_textrels = NULL;
80 static char **qa_execstack = NULL;
81 static char **qa_wx_load = NULL;
82
83 int match_bits = 0;
84 caddr_t ldcache = 0;
85 size_t ldcache_size = 0;
86 unsigned long setpax = 0UL;
87
88
89
90 /* sub-funcs for scanelf_file() */
91 static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
92 {
93 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
94 #define GET_SYMTABS(B) \
95 if (elf->elf_class == ELFCLASS ## B) { \
96 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
97 /* debug sections */ \
98 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
99 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
100 /* runtime sections */ \
101 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
102 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
103 if (symtab && dynsym) { \
104 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \
105 } else { \
106 *sym = (void*)(symtab ? symtab : dynsym); \
107 } \
108 if (strtab && dynstr) { \
109 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \
110 } else { \
111 *tab = (void*)(strtab ? strtab : dynstr); \
112 } \
113 }
114 GET_SYMTABS(32)
115 GET_SYMTABS(64)
116 }
117
118 static char *scanelf_file_pax(elfobj *elf, char *found_pax)
119 {
120 static char ret[7];
121 unsigned long i, shown;
122
123 if (!show_pax) return NULL;
124
125 shown = 0;
126 memset(&ret, 0, sizeof(ret));
127
128 if (elf->phdr) {
129 #define SHOW_PAX(B) \
130 if (elf->elf_class == ELFCLASS ## B) { \
131 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
132 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
133 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
134 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
135 continue; \
136 if (fix_elf && setpax) { \
137 /* set the paxctl flags */ \
138 ESET(phdr[i].p_flags, setpax); \
139 } \
140 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
141 continue; \
142 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
143 *found_pax = 1; \
144 ++shown; \
145 break; \
146 } \
147 }
148 SHOW_PAX(32)
149 SHOW_PAX(64)
150 }
151
152
153 if (fix_elf && setpax) {
154 /* set the chpax settings */
155 if (elf->elf_class == ELFCLASS32) {
156 if (EHDR32(elf->ehdr)->e_type == ET_DYN || EHDR32(elf->ehdr)->e_type == ET_EXEC)
157 ESET(EHDR32(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
158 } else {
159 if (EHDR64(elf->ehdr)->e_type == ET_DYN || EHDR64(elf->ehdr)->e_type == ET_EXEC)
160 ESET(EHDR64(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
161 }
162 }
163
164 /* fall back to EI_PAX if no PT_PAX was found */
165 if (!*ret) {
166 static char *paxflags;
167 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
168 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
169 *found_pax = 1;
170 return (be_wewy_wewy_quiet ? NULL : paxflags);
171 }
172 strncpy(ret, paxflags, sizeof(ret));
173 }
174
175 if (be_wewy_wewy_quiet || (be_quiet && !shown))
176 return NULL;
177 else
178 return ret;
179 }
180
181 static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
182 {
183 static char ret[12];
184 char *found;
185 unsigned long i, shown, multi_stack, multi_relro, multi_load;
186 int max_pt_load;
187
188 if (!show_phdr) return NULL;
189
190 memcpy(ret, "--- --- ---\0", 12);
191
192 shown = 0;
193 multi_stack = multi_relro = multi_load = 0;
194 max_pt_load = elf_max_pt_load(elf);
195
196 #define NOTE_GNU_STACK ".note.GNU-stack"
197 #define SHOW_PHDR(B) \
198 if (elf->elf_class == ELFCLASS ## B) { \
199 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
200 Elf ## B ## _Off offset; \
201 uint32_t flags, check_flags; \
202 if (elf->phdr != NULL) { \
203 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
204 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
205 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
206 if (multi_stack++) \
207 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
208 if (file_matches_list(elf->filename, qa_execstack)) \
209 continue; \
210 found = found_phdr; \
211 offset = 0; \
212 check_flags = PF_X; \
213 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
214 if (multi_relro++) \
215 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
216 found = found_relro; \
217 offset = 4; \
218 check_flags = PF_X; \
219 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
220 if (ehdr->e_type == ET_DYN || ehdr->e_type == ET_EXEC) \
221 if (multi_load++ > max_pt_load) \
222 warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
223 if (file_matches_list(elf->filename, qa_wx_load)) \
224 continue; \
225 found = found_load; \
226 offset = 8; \
227 check_flags = PF_W|PF_X; \
228 } else \
229 continue; \
230 flags = EGET(phdr[i].p_flags); \
231 if (be_quiet && ((flags & check_flags) != check_flags)) \
232 continue; \
233 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
234 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
235 ret[3] = ret[7] = '!'; \
236 flags = EGET(phdr[i].p_flags); \
237 } \
238 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
239 *found = 1; \
240 ++shown; \
241 } \
242 } else if (elf->shdr != NULL) { \
243 /* no program headers which means this is prob an object file */ \
244 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
245 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
246 char *str; \
247 if ((void*)strtbl > (void*)elf->data_end) \
248 goto skip_this_shdr##B; \
249 check_flags = SHF_WRITE|SHF_EXECINSTR; \
250 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
251 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
252 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
253 str = elf->data + offset; \
254 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
255 if (!strcmp(str, NOTE_GNU_STACK)) { \
256 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
257 flags = EGET(shdr[i].sh_flags); \
258 if (be_quiet && ((flags & check_flags) != check_flags)) \
259 continue; \
260 ++*found_phdr; \
261 shown = 1; \
262 if (flags & SHF_WRITE) ret[0] = 'W'; \
263 if (flags & SHF_ALLOC) ret[1] = 'A'; \
264 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
265 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
266 break; \
267 } \
268 } \
269 skip_this_shdr##B: \
270 if (!multi_stack) { \
271 if (file_matches_list(elf->filename, qa_execstack)) \
272 return NULL; \
273 *found_phdr = 1; \
274 shown = 1; \
275 memcpy(ret, "!WX", 3); \
276 } \
277 } \
278 }
279 SHOW_PHDR(32)
280 SHOW_PHDR(64)
281
282 if (be_wewy_wewy_quiet || (be_quiet && !shown))
283 return NULL;
284 else
285 return ret;
286 }
287
288 static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
289 {
290 static const char *ret = "TEXTREL";
291 unsigned long i;
292
293 if (!show_textrel && !show_textrels) return NULL;
294
295 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
296
297 if (elf->phdr) {
298 #define SHOW_TEXTREL(B) \
299 if (elf->elf_class == ELFCLASS ## B) { \
300 Elf ## B ## _Dyn *dyn; \
301 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
302 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
303 Elf ## B ## _Off offset; \
304 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
305 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
306 offset = EGET(phdr[i].p_offset); \
307 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
308 dyn = DYN ## B (elf->data + offset); \
309 while (EGET(dyn->d_tag) != DT_NULL) { \
310 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
311 *found_textrel = 1; \
312 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
313 return (be_wewy_wewy_quiet ? NULL : ret); \
314 } \
315 ++dyn; \
316 } \
317 } }
318 SHOW_TEXTREL(32)
319 SHOW_TEXTREL(64)
320 }
321
322 if (be_quiet || be_wewy_wewy_quiet)
323 return NULL;
324 else
325 return " - ";
326 }
327 static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
328 {
329 unsigned long s, r, rmax;
330 void *symtab_void, *strtab_void, *text_void;
331
332 if (!show_textrels) return NULL;
333
334 /* don't search for TEXTREL's if the ELF doesn't have any */
335 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
336 if (!*found_textrel) return NULL;
337
338 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
339 text_void = elf_findsecbyname(elf, ".text");
340
341 if (symtab_void && strtab_void && text_void && elf->shdr) {
342 #define SHOW_TEXTRELS(B) \
343 if (elf->elf_class == ELFCLASS ## B) { \
344 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
345 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
346 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
347 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
348 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
349 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
350 uint ## B ## _t memsz = EGET(text->sh_size); \
351 Elf ## B ## _Rel *rel; \
352 Elf ## B ## _Rela *rela; \
353 /* search the section headers for relocations */ \
354 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
355 uint32_t sh_type = EGET(shdr[s].sh_type); \
356 if (sh_type == SHT_REL) { \
357 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \
358 rela = NULL; \
359 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
360 } else if (sh_type == SHT_RELA) { \
361 rel = NULL; \
362 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \
363 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
364 } else \
365 continue; \
366 /* now see if any of the relocs are in the .text */ \
367 for (r = 0; r < rmax; ++r) { \
368 unsigned long sym_max; \
369 Elf ## B ## _Addr offset_tmp; \
370 Elf ## B ## _Sym *func; \
371 Elf ## B ## _Sym *sym; \
372 Elf ## B ## _Addr r_offset; \
373 uint ## B ## _t r_info; \
374 if (sh_type == SHT_REL) { \
375 r_offset = EGET(rel[r].r_offset); \
376 r_info = EGET(rel[r].r_info); \
377 } else { \
378 r_offset = EGET(rela[r].r_offset); \
379 r_info = EGET(rela[r].r_info); \
380 } \
381 /* make sure this relocation is inside of the .text */ \
382 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
383 if (be_verbose <= 2) continue; \
384 } else \
385 *found_textrels = 1; \
386 /* locate this relocation symbol name */ \
387 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
388 if ((void*)sym > (void*)elf->data_end) { \
389 warn("%s: corrupt ELF symbol", elf->filename); \
390 continue; \
391 } \
392 sym_max = ELF ## B ## _R_SYM(r_info); \
393 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
394 sym += sym_max; \
395 else \
396 sym = NULL; \
397 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
398 /* show the raw details about this reloc */ \
399 printf(" %s: ", elf->base_filename); \
400 if (sym && sym->st_name) \
401 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \
402 else \
403 printf("(memory/fake?)"); \
404 printf(" [0x%lX]", (unsigned long)r_offset); \
405 /* now try to find the closest symbol that this rel is probably in */ \
406 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
407 func = NULL; \
408 offset_tmp = 0; \
409 while (sym_max--) { \
410 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
411 func = sym; \
412 offset_tmp = EGET(sym->st_value); \
413 } \
414 ++sym; \
415 } \
416 printf(" in "); \
417 if (func && func->st_name) \
418 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \
419 else \
420 printf("(NULL: fake?)"); \
421 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
422 } \
423 } }
424 SHOW_TEXTRELS(32)
425 SHOW_TEXTRELS(64)
426 }
427 if (!*found_textrels)
428 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
429
430 return NULL;
431 }
432
433 static void rpath_security_checks(elfobj *, char *, const char *);
434 static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
435 {
436 struct stat st;
437 switch (*item) {
438 case '/': break;
439 case '.':
440 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
441 break;
442 case ':':
443 case '\0':
444 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
445 break;
446 case '$':
447 if (fstat(elf->fd, &st) != -1)
448 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
449 warnf("Security problem with %s='%s' in %s with mode set of %o",
450 dt_type, item, elf->filename, st.st_mode & 07777);
451 break;
452 default:
453 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
454 break;
455 }
456 }
457 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
458 {
459 unsigned long i, s;
460 char *rpath, *runpath, **r;
461 void *strtbl_void;
462
463 if (!show_rpath) return;
464
465 strtbl_void = elf_findsecbyname(elf, ".dynstr");
466 rpath = runpath = NULL;
467
468 if (elf->phdr && strtbl_void) {
469 #define SHOW_RPATH(B) \
470 if (elf->elf_class == ELFCLASS ## B) { \
471 Elf ## B ## _Dyn *dyn; \
472 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
473 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
474 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
475 Elf ## B ## _Off offset; \
476 Elf ## B ## _Xword word; \
477 /* Scan all the program headers */ \
478 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
479 /* Just scan dynamic headers */ \
480 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
481 offset = EGET(phdr[i].p_offset); \
482 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
483 /* Just scan dynamic RPATH/RUNPATH headers */ \
484 dyn = DYN ## B (elf->data + offset); \
485 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
486 if (word == DT_RPATH) { \
487 r = &rpath; \
488 } else if (word == DT_RUNPATH) { \
489 r = &runpath; \
490 } else { \
491 ++dyn; \
492 continue; \
493 } \
494 /* Verify the memory is somewhat sane */ \
495 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
496 if (offset < (Elf ## B ## _Off)elf->len) { \
497 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
498 *r = (char*)(elf->data + offset); \
499 /* cache the length in case we need to nuke this section later on */ \
500 if (fix_elf) \
501 offset = strlen(*r); \
502 /* If quiet, don't output paths in ld.so.conf */ \
503 if (be_quiet) { \
504 size_t len; \
505 char *start, *end; \
506 /* note that we only 'chop' off leading known paths. */ \
507 /* since *r is read-only memory, we can only move the ptr forward. */ \
508 start = *r; \
509 /* scan each path in : delimited list */ \
510 while (start) { \
511 rpath_security_checks(elf, start, get_elfdtype(word)); \
512 end = strchr(start, ':'); \
513 len = (end ? abs(end - start) : strlen(start)); \
514 if (use_ldcache) \
515 for (s = 0; ldpaths[s]; ++s) \
516 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
517 *r = end; \
518 /* corner case ... if RPATH reads "/usr/lib:", we want \
519 * to show ':' rather than '' */ \
520 if (end && end[1] != '\0') \
521 (*r)++; \
522 break; \
523 } \
524 if (!*r || !end) \
525 break; \
526 else \
527 start = start + len + 1; \
528 } \
529 } \
530 if (*r) { \
531 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
532 /* just nuke it */ \
533 nuke_it##B: \
534 memset(*r, 0x00, offset); \
535 *r = NULL; \
536 ESET(dyn->d_tag, DT_DEBUG); \
537 ESET(dyn->d_un.d_ptr, 0); \
538 } else if (fix_elf) { \
539 /* try to clean "bad" paths */ \
540 size_t len, tmpdir_len; \
541 char *start, *end; \
542 const char *tmpdir; \
543 start = *r; \
544 tmpdir = (getenv("TMPDIR") ? : "."); \
545 tmpdir_len = strlen(tmpdir); \
546 while (1) { \
547 end = strchr(start, ':'); \
548 if (start == end) { \
549 eat_this_path##B: \
550 len = strlen(end); \
551 memmove(start, end+1, len); \
552 start[len-1] = '\0'; \
553 end = start - 1; \
554 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
555 if (!end) { \
556 if (start == *r) \
557 goto nuke_it##B; \
558 *--start = '\0'; \
559 } else \
560 goto eat_this_path##B; \
561 } \
562 if (!end) \
563 break; \
564 start = end + 1; \
565 } \
566 if (**r == '\0') \
567 goto nuke_it##B; \
568 } \
569 if (*r) \
570 *found_rpath = 1; \
571 } \
572 } \
573 ++dyn; \
574 } \
575 } }
576 SHOW_RPATH(32)
577 SHOW_RPATH(64)
578 }
579
580 if (be_wewy_wewy_quiet) return;
581
582 if (rpath && runpath) {
583 if (!strcmp(rpath, runpath)) {
584 xstrcat(ret, runpath, ret_len);
585 } else {
586 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
587 xchrcat(ret, '{', ret_len);
588 xstrcat(ret, rpath, ret_len);
589 xchrcat(ret, ',', ret_len);
590 xstrcat(ret, runpath, ret_len);
591 xchrcat(ret, '}', ret_len);
592 }
593 } else if (rpath || runpath)
594 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
595 else if (!be_quiet)
596 xstrcat(ret, " - ", ret_len);
597 }
598
599 #define LDSO_CACHE_MAGIC "ld.so-"
600 #define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
601 #define LDSO_CACHE_VER "1.7.0"
602 #define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
603 #define FLAG_ANY -1
604 #define FLAG_TYPE_MASK 0x00ff
605 #define FLAG_LIBC4 0x0000
606 #define FLAG_ELF 0x0001
607 #define FLAG_ELF_LIBC5 0x0002
608 #define FLAG_ELF_LIBC6 0x0003
609 #define FLAG_REQUIRED_MASK 0xff00
610 #define FLAG_SPARC_LIB64 0x0100
611 #define FLAG_IA64_LIB64 0x0200
612 #define FLAG_X8664_LIB64 0x0300
613 #define FLAG_S390_LIB64 0x0400
614 #define FLAG_POWERPC_LIB64 0x0500
615 #define FLAG_MIPS64_LIBN32 0x0600
616 #define FLAG_MIPS64_LIBN64 0x0700
617
618 static char *lookup_cache_lib(elfobj *, char *);
619
620 #if defined(__GLIBC__) || defined(__UCLIBC__)
621
622 static char *lookup_cache_lib(elfobj *elf, char *fname)
623 {
624 int fd = 0;
625 char *strs;
626 static char buf[__PAX_UTILS_PATH_MAX] = "";
627 const char *cachefile = "/etc/ld.so.cache";
628 struct stat st;
629
630 typedef struct {
631 char magic[LDSO_CACHE_MAGIC_LEN];
632 char version[LDSO_CACHE_VER_LEN];
633 int nlibs;
634 } header_t;
635 header_t *header;
636
637 typedef struct {
638 int flags;
639 int sooffset;
640 int liboffset;
641 } libentry_t;
642 libentry_t *libent;
643
644 if (fname == NULL)
645 return NULL;
646
647 if (ldcache == 0) {
648 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1)
649 return NULL;
650
651 /* cache these values so we only map/unmap the cache file once */
652 ldcache_size = st.st_size;
653 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
654
655 close(fd);
656
657 if (ldcache == (caddr_t)-1) {
658 ldcache = 0;
659 return NULL;
660 }
661
662 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
663 return NULL;
664 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
665 return NULL;
666 }
667
668 header = (header_t *) ldcache;
669 libent = (libentry_t *) (ldcache + sizeof(header_t));
670 strs = (char *) &libent[header->nlibs];
671
672 for (fd = 0; fd < header->nlibs; fd++) {
673 /* this should be more fine grained, but for now we assume that
674 * diff arches will not be cached together. and we ignore the
675 * the different multilib mips cases. */
676 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
677 continue;
678 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
679 continue;
680
681 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
682 continue;
683 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
684 }
685 return buf;
686 }
687 #elif defined(__NetBSD__)
688 static char *lookup_cache_lib(elfobj *elf, char *fname)
689 {
690 static char buf[__PAX_UTILS_PATH_MAX] = "";
691 static struct stat st;
692
693 char **ldpath;
694 for (ldpath = ldpaths; *ldpath != NULL; ldpath++) {
695 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", *ldpath, fname) >= sizeof(buf))
696 continue; /* if the pathname is too long, or something went wrong, ignore */
697
698 if (stat(buf, &st) != 0)
699 continue; /* if the lib doesn't exist in *ldpath, look further */
700
701 /* NetBSD doesn't actually do sanity checks, it just loads the file
702 * and if that doesn't work, continues looking in other directories.
703 * This cannot easily be safely emulated, unfortunately. For now,
704 * just assume that if it exists, it's a valid library. */
705
706 return buf;
707 }
708
709 /* not found in any path */
710 return NULL;
711 }
712 #else
713 #warning Cache support not implemented for your target
714 static char *lookup_cache_lib(elfobj *elf, char *fname)
715 {
716 return NULL;
717 }
718 #endif
719
720 static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
721 {
722 unsigned long i;
723 char *needed;
724 void *strtbl_void;
725 char *p;
726
727 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
728
729 strtbl_void = elf_findsecbyname(elf, ".dynstr");
730
731 if (elf->phdr && strtbl_void) {
732 #define SHOW_NEEDED(B) \
733 if (elf->elf_class == ELFCLASS ## B) { \
734 Elf ## B ## _Dyn *dyn; \
735 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
736 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
737 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
738 Elf ## B ## _Off offset; \
739 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
740 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
741 offset = EGET(phdr[i].p_offset); \
742 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
743 dyn = DYN ## B (elf->data + offset); \
744 while (EGET(dyn->d_tag) != DT_NULL) { \
745 if (EGET(dyn->d_tag) == DT_NEEDED) { \
746 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
747 if (offset >= (Elf ## B ## _Off)elf->len) { \
748 ++dyn; \
749 continue; \
750 } \
751 needed = (char*)(elf->data + offset); \
752 if (op == 0) { \
753 if (!be_wewy_wewy_quiet) { \
754 if (*found_needed) xchrcat(ret, ',', ret_len); \
755 if (use_ldcache) \
756 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
757 needed = p; \
758 xstrcat(ret, needed, ret_len); \
759 } \
760 *found_needed = 1; \
761 } else { \
762 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \
763 *found_lib = 1; \
764 return (be_wewy_wewy_quiet ? NULL : needed); \
765 } \
766 } \
767 } \
768 ++dyn; \
769 } \
770 } }
771 SHOW_NEEDED(32)
772 SHOW_NEEDED(64)
773 if (op == 0 && !*found_needed && be_verbose)
774 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
775 }
776
777 return NULL;
778 }
779 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
780 {
781 void *strtbl_void;
782
783 if (!show_interp) return NULL;
784
785 strtbl_void = elf_findsecbyname(elf, ".interp");
786
787 if (strtbl_void) {
788 #define SHOW_INTERP(B) \
789 if (elf->elf_class == ELFCLASS ## B) { \
790 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
791 *found_interp = 1; \
792 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
793 }
794 SHOW_INTERP(32)
795 SHOW_INTERP(64)
796 }
797 return NULL;
798 }
799 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
800 {
801 unsigned long i;
802 struct stat s;
803 char dynamic = 0;
804
805 if (!show_bind) return NULL;
806 if (!elf->phdr) return NULL;
807
808 #define SHOW_BIND(B) \
809 if (elf->elf_class == ELFCLASS ## B) { \
810 Elf ## B ## _Dyn *dyn; \
811 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
812 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
813 Elf ## B ## _Off offset; \
814 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
815 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
816 dynamic = 1; \
817 offset = EGET(phdr[i].p_offset); \
818 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
819 dyn = DYN ## B (elf->data + offset); \
820 while (EGET(dyn->d_tag) != DT_NULL) { \
821 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
822 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
823 { \
824 if (be_quiet) return NULL; \
825 *found_bind = 1; \
826 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
827 } \
828 ++dyn; \
829 } \
830 } \
831 }
832 SHOW_BIND(32)
833 SHOW_BIND(64)
834
835 if (be_wewy_wewy_quiet) return NULL;
836
837 /* don't output anything if quiet mode and the ELF is static or not setuid */
838 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
839 return NULL;
840 } else {
841 *found_bind = 1;
842 return (char *) (dynamic ? "LAZY" : "STATIC");
843 }
844 }
845 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
846 {
847 unsigned long i;
848 char *soname;
849 void *strtbl_void;
850
851 if (!show_soname) return NULL;
852
853 strtbl_void = elf_findsecbyname(elf, ".dynstr");
854
855 if (elf->phdr && strtbl_void) {
856 #define SHOW_SONAME(B) \
857 if (elf->elf_class == ELFCLASS ## B) { \
858 Elf ## B ## _Dyn *dyn; \
859 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
860 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
861 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
862 Elf ## B ## _Off offset; \
863 /* only look for soname in shared objects */ \
864 if (ehdr->e_type != ET_DYN) \
865 return NULL; \
866 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
867 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
868 offset = EGET(phdr[i].p_offset); \
869 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
870 dyn = DYN ## B (elf->data + offset); \
871 while (EGET(dyn->d_tag) != DT_NULL) { \
872 if (EGET(dyn->d_tag) == DT_SONAME) { \
873 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
874 if (offset >= (Elf ## B ## _Off)elf->len) { \
875 ++dyn; \
876 continue; \
877 } \
878 soname = (char*)(elf->data + offset); \
879 *found_soname = 1; \
880 return (be_wewy_wewy_quiet ? NULL : soname); \
881 } \
882 ++dyn; \
883 } \
884 } }
885 SHOW_SONAME(32)
886 SHOW_SONAME(64)
887 }
888
889 return NULL;
890 }
891 static char *scanelf_file_sym(elfobj *elf, char *found_sym)
892 {
893 unsigned long i;
894 char *ret;
895 void *symtab_void, *strtab_void;
896
897 if (!find_sym) return NULL;
898 ret = find_sym;
899
900 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
901
902 if (symtab_void && strtab_void) {
903 #define FIND_SYM(B) \
904 if (elf->elf_class == ELFCLASS ## B) { \
905 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
906 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
907 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
908 unsigned long cnt = EGET(symtab->sh_entsize); \
909 char *symname; \
910 if (cnt) \
911 cnt = EGET(symtab->sh_size) / cnt; \
912 for (i = 0; i < cnt; ++i) { \
913 if (sym->st_name) { \
914 /* make sure the symbol name is in acceptable memory range */ \
915 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
916 if ((void*)symname > (void*)elf->data_end) { \
917 warnf("%s: corrupt ELF symbols", elf->filename); \
918 ++sym; \
919 continue; \
920 } \
921 /* debug display ... show all symbols and some extra info */ \
922 if (*ret == '*') { \
923 printf("%s(%s) %5lX %15s %s\n", \
924 ((*found_sym == 0) ? "\n\t" : "\t"), \
925 elf->base_filename, \
926 (unsigned long)sym->st_size, \
927 get_elfstttype(sym->st_info), \
928 symname); \
929 *found_sym = 1; \
930 } else { \
931 /* allow the user to specify a comma delimited list of symbols to search for */ \
932 char *this_sym, *this_sym_ver, *next_sym; \
933 this_sym = ret; \
934 this_sym_ver = versioned_symname; \
935 do { \
936 next_sym = strchr(this_sym, ','); \
937 if (next_sym == NULL) \
938 next_sym = this_sym + strlen(this_sym); \
939 /* do we want a defined symbol ? */ \
940 if (*this_sym == '+') { \
941 if (sym->st_shndx == SHN_UNDEF) \
942 goto skip_this_sym##B; \
943 ++this_sym; \
944 ++this_sym_ver; \
945 /* do we want an undefined symbol ? */ \
946 } else if (*this_sym == '-') { \
947 if (sym->st_shndx != SHN_UNDEF) \
948 goto skip_this_sym##B; \
949 ++this_sym; \
950 ++this_sym_ver; \
951 } \
952 /* ok, lets compare the name now */ \
953 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
954 (strncmp(this_sym_ver, symname, strlen(this_sym_ver)) == 0)) { \
955 if (be_semi_verbose) { \
956 char buf[126]; \
957 snprintf(buf, sizeof(buf), "%lX %s %s", \
958 (unsigned long)sym->st_size, get_elfstttype(sym->st_info), this_sym); \
959 ret = buf; \
960 } else \
961 ret = this_sym; \
962 (*found_sym)++; \
963 goto break_out; \
964 } \
965 skip_this_sym##B: this_sym = next_sym + 1; \
966 } while (*next_sym != '\0'); \
967 } \
968 } \
969 ++sym; \
970 } }
971 FIND_SYM(32)
972 FIND_SYM(64)
973 }
974
975 break_out:
976 if (be_wewy_wewy_quiet) return NULL;
977
978 if (*find_sym != '*' && *found_sym)
979 return ret;
980 if (be_quiet)
981 return NULL;
982 else
983 return (char *)" - ";
984 }
985
986
987 static char *scanelf_file_sections(elfobj *elf, char *found_section)
988 {
989 if (!find_section)
990 return NULL;
991
992 #define FIND_SECTION(B) \
993 if (elf->elf_class == ELFCLASS ## B) { \
994 int invert; \
995 Elf ## B ## _Shdr *section; \
996 invert = (*find_section == '!' ? 1 : 0); \
997 section = SHDR ## B (elf_findsecbyname(elf, find_section+invert)); \
998 if ((section == NULL && invert) || (section != NULL && !invert)) \
999 *found_section = 1; \
1000 }
1001 FIND_SECTION(32)
1002 FIND_SECTION(64)
1003
1004 if (be_wewy_wewy_quiet)
1005 return NULL;
1006
1007 if (*found_section)
1008 return find_section;
1009
1010 if (be_quiet)
1011 return NULL;
1012 else
1013 return (char *)" - ";
1014 }
1015
1016 /* scan an elf file and show all the fun stuff */
1017 #define prints(str) write(fileno(stdout), str, strlen(str))
1018 static int scanelf_elfobj(elfobj *elf)
1019 {
1020 unsigned long i;
1021 char found_pax, found_phdr, found_relro, found_load, found_textrel,
1022 found_rpath, found_needed, found_interp, found_bind, found_soname,
1023 found_sym, found_lib, found_file, found_textrels, found_section;
1024 static char *out_buffer = NULL;
1025 static size_t out_len;
1026
1027 found_pax = found_phdr = found_relro = found_load = found_textrel = \
1028 found_rpath = found_needed = found_interp = found_bind = found_soname = \
1029 found_sym = found_lib = found_file = found_textrels = found_section = 0;
1030
1031 if (be_verbose > 2)
1032 printf("%s: scanning file {%s,%s}\n", elf->filename,
1033 get_elfeitype(EI_CLASS, elf->elf_class),
1034 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
1035 else if (be_verbose > 1)
1036 printf("%s: scanning file\n", elf->filename);
1037
1038 /* init output buffer */
1039 if (!out_buffer) {
1040 out_len = sizeof(char) * 80;
1041 out_buffer = (char*)xmalloc(out_len);
1042 }
1043 *out_buffer = '\0';
1044
1045 /* show the header */
1046 if (!be_quiet && show_banner) {
1047 for (i = 0; out_format[i]; ++i) {
1048 if (!IS_MODIFIER(out_format[i])) continue;
1049
1050 switch (out_format[++i]) {
1051 case '+': break;
1052 case '%': break;
1053 case '#': break;
1054 case 'F':
1055 case 'p':
1056 case 'f': prints("FILE "); found_file = 1; break;
1057 case 'o': prints(" TYPE "); break;
1058 case 'x': prints(" PAX "); break;
1059 case 'e': prints("STK/REL/PTL "); break;
1060 case 't': prints("TEXTREL "); break;
1061 case 'r': prints("RPATH "); break;
1062 case 'n': prints("NEEDED "); break;
1063 case 'i': prints("INTERP "); break;
1064 case 'b': prints("BIND "); break;
1065 case 'S': prints("SONAME "); break;
1066 case 's': prints("SYM "); break;
1067 case 'N': prints("LIB "); break;
1068 case 'T': prints("TEXTRELS "); break;
1069 case 'k': prints("SECTION "); break;
1070 default: warnf("'%c' has no title ?", out_format[i]);
1071 }
1072 }
1073 if (!found_file) prints("FILE ");
1074 prints("\n");
1075 found_file = 0;
1076 show_banner = 0;
1077 }
1078
1079 /* dump all the good stuff */
1080 for (i = 0; out_format[i]; ++i) {
1081 const char *out;
1082 const char *tmp;
1083
1084 if (!IS_MODIFIER(out_format[i])) {
1085 xchrcat(&out_buffer, out_format[i], &out_len);
1086 continue;
1087 }
1088
1089 out = NULL;
1090 be_wewy_wewy_quiet = (out_format[i] == '#');
1091 be_semi_verbose = (out_format[i] == '+');
1092 switch (out_format[++i]) {
1093 case '+':
1094 case '%':
1095 case '#':
1096 xchrcat(&out_buffer, out_format[i], &out_len); break;
1097 case 'F':
1098 found_file = 1;
1099 if (be_wewy_wewy_quiet) break;
1100 xstrcat(&out_buffer, elf->filename, &out_len);
1101 break;
1102 case 'p':
1103 found_file = 1;
1104 if (be_wewy_wewy_quiet) break;
1105 tmp = elf->filename;
1106 if (search_path) {
1107 ssize_t len_search = strlen(search_path);
1108 ssize_t len_file = strlen(elf->filename);
1109 if (!strncmp(elf->filename, search_path, len_search) && \
1110 len_file > len_search)
1111 tmp += len_search;
1112 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1113 }
1114 xstrcat(&out_buffer, tmp, &out_len);
1115 break;
1116 case 'f':
1117 found_file = 1;
1118 if (be_wewy_wewy_quiet) break;
1119 tmp = strrchr(elf->filename, '/');
1120 tmp = (tmp == NULL ? elf->filename : tmp+1);
1121 xstrcat(&out_buffer, tmp, &out_len);
1122 break;
1123 case 'o': out = get_elfetype(elf); break;
1124 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
1125 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
1126 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1127 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
1128 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1129 case 'n':
1130 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
1131 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1132 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1133 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
1134 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1135 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1136 default: warnf("'%c' has no scan code?", out_format[i]);
1137 }
1138 if (out) {
1139 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
1140 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
1141 xstrncat(&out_buffer, out, &out_len, (tmp-out));
1142 else
1143 xstrcat(&out_buffer, out, &out_len);
1144 }
1145 }
1146
1147 #define FOUND_SOMETHING() \
1148 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1149 found_rpath || found_needed || found_interp || found_bind || \
1150 found_soname || found_sym || found_lib || found_textrels || found_section )
1151
1152 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1153 xchrcat(&out_buffer, ' ', &out_len);
1154 xstrcat(&out_buffer, elf->filename, &out_len);
1155 }
1156 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
1157 puts(out_buffer);
1158 fflush(stdout);
1159 }
1160
1161 return 0;
1162 }
1163
1164 /* scan a single elf */
1165 static int scanelf_elf(const char *filename, int fd, size_t len)
1166 {
1167 int ret = 1;
1168 elfobj *elf;
1169
1170 /* verify this is real ELF */
1171 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1172 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1173 return ret;
1174 }
1175 switch (match_bits) {
1176 case 32:
1177 if (elf->elf_class != ELFCLASS32)
1178 goto label_done;
1179 break;
1180 case 64:
1181 if (elf->elf_class != ELFCLASS64)
1182 goto label_done;
1183 break;
1184 default: break;
1185 }
1186 if (strlen(match_etypes)) {
1187 char sbuf[126];
1188 strncpy(sbuf, match_etypes, sizeof(sbuf));
1189 if (strchr(match_etypes, ',') != NULL) {
1190 char *p;
1191 while((p = strrchr(sbuf, ',')) != NULL) {
1192 *p = 0;
1193 if (etype_lookup(p+1) == get_etype(elf))
1194 goto label_ret;
1195 }
1196 }
1197 if (etype_lookup(sbuf) != get_etype(elf))
1198 goto label_done;
1199 }
1200
1201 label_ret:
1202 ret = scanelf_elfobj(elf);
1203
1204 label_done:
1205 unreadelf(elf);
1206 return ret;
1207 }
1208
1209 /* scan an archive of elfs */
1210 static int scanelf_archive(const char *filename, int fd, size_t len)
1211 {
1212 archive_handle *ar;
1213 archive_member *m;
1214 char *ar_buffer;
1215 elfobj *elf;
1216
1217 ar = ar_open_fd(filename, fd);
1218 if (ar == NULL)
1219 return 1;
1220
1221 ar_buffer = (char*)mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1222 while ((m=ar_next(ar)) != NULL) {
1223 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size);
1224 if (elf) {
1225 scanelf_elfobj(elf);
1226 unreadelf(elf);
1227 }
1228 }
1229 munmap(ar_buffer, len);
1230
1231 return 0;
1232 }
1233 /* scan a file which may be an elf or an archive or some other magical beast */
1234 static void scanelf_file(const char *filename, const struct stat *st_cache)
1235 {
1236 const struct stat *st = st_cache;
1237 struct stat symlink_st;
1238 int fd;
1239
1240 /* always handle regular files and handle symlinked files if no -y */
1241 if (S_ISLNK(st->st_mode)) {
1242 if (!scan_symlink) return;
1243 stat(filename, &symlink_st);
1244 st = &symlink_st;
1245 }
1246
1247 if (!S_ISREG(st->st_mode)) {
1248 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1249 return;
1250 }
1251
1252 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1253 return;
1254
1255 if (scanelf_elf(filename, fd, st->st_size) == 1 && scan_archives)
1256 /* if it isn't an ELF, maybe it's an .a archive */
1257 scanelf_archive(filename, fd, st->st_size);
1258
1259 close(fd);
1260 }
1261
1262 /* scan a directory for ET_EXEC files and print when we find one */
1263 static void scanelf_dir(const char *path)
1264 {
1265 register DIR *dir;
1266 register struct dirent *dentry;
1267 struct stat st_top, st;
1268 char buf[__PAX_UTILS_PATH_MAX];
1269 size_t pathlen = 0, len = 0;
1270
1271 /* make sure path exists */
1272 if (lstat(path, &st_top) == -1) {
1273 if (be_verbose > 2) printf("%s: does not exist\n", path);
1274 return;
1275 }
1276
1277 /* ok, if it isn't a directory, assume we can open it */
1278 if (!S_ISDIR(st_top.st_mode)) {
1279 scanelf_file(path, &st_top);
1280 return;
1281 }
1282
1283 /* now scan the dir looking for fun stuff */
1284 if ((dir = opendir(path)) == NULL) {
1285 warnf("could not opendir %s: %s", path, strerror(errno));
1286 return;
1287 }
1288 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1289
1290 pathlen = strlen(path);
1291 while ((dentry = readdir(dir))) {
1292 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1293 continue;
1294 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
1295 if (len >= sizeof(buf)) {
1296 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1297 (unsigned long)len, (unsigned long)sizeof(buf));
1298 continue;
1299 }
1300 snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name);
1301 if (lstat(buf, &st) != -1) {
1302 if (S_ISREG(st.st_mode))
1303 scanelf_file(buf, &st);
1304 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1305 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1306 scanelf_dir(buf);
1307 }
1308 }
1309 }
1310 closedir(dir);
1311 }
1312
1313 static int scanelf_from_file(const char *filename)
1314 {
1315 FILE *fp = NULL;
1316 char *p;
1317 char path[__PAX_UTILS_PATH_MAX];
1318
1319 if (strcmp(filename, "-") == 0)
1320 fp = stdin;
1321 else if ((fp = fopen(filename, "r")) == NULL)
1322 return 1;
1323
1324 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1325 if ((p = strchr(path, '\n')) != NULL)
1326 *p = 0;
1327 search_path = path;
1328 scanelf_dir(path);
1329 }
1330 if (fp != stdin)
1331 fclose(fp);
1332 return 0;
1333 }
1334
1335 #if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1336
1337 static int load_ld_cache_config(int i, const char *fname)
1338 {
1339 FILE *fp = NULL;
1340 char *p;
1341 char path[__PAX_UTILS_PATH_MAX];
1342
1343 if (i + 1 == ARRAY_SIZE(ldpaths))
1344 return i;
1345
1346 if ((fp = fopen(fname, "r")) == NULL)
1347 return i;
1348
1349 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1350 if ((p = strrchr(path, '\r')) != NULL)
1351 *p = 0;
1352 if ((p = strchr(path, '\n')) != NULL)
1353 *p = 0;
1354 #ifdef __linux__
1355 // recursive includes of the same file will make this segfault.
1356 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1357 glob64_t gl;
1358 size_t x;
1359 char gpath[__PAX_UTILS_PATH_MAX];
1360
1361 memset(gpath, 0, sizeof(gpath));
1362
1363 if (path[8] != '/')
1364 snprintf(gpath, sizeof(gpath), "/etc/%s", &path[8]);
1365 else
1366 strncpy(gpath, &path[8], sizeof(gpath));
1367
1368 if ((glob64(gpath, 0, NULL, &gl)) == 0) {
1369 for (x = 0; x < gl.gl_pathc; ++x) {
1370 /* try to avoid direct loops */
1371 if (strcmp(gl.gl_pathv[x], fname) == 0)
1372 continue;
1373 i = load_ld_cache_config(i, gl.gl_pathv[x]);
1374 if (i + 1 >= ARRAY_SIZE(ldpaths)) {
1375 globfree64(&gl);
1376 return i;
1377 }
1378 }
1379 globfree64 (&gl);
1380 continue;
1381 }
1382 }
1383 #endif
1384 if (*path != '/')
1385 continue;
1386
1387 ldpaths[i++] = xstrdup(path);
1388
1389 if (i + 1 == ARRAY_SIZE(ldpaths))
1390 break;
1391 }
1392 ldpaths[i] = NULL;
1393
1394 fclose(fp);
1395 return i;
1396 }
1397
1398 #elif defined(__FreeBSD__) || (__DragonFly__)
1399
1400 static int load_ld_cache_config(int i, const char *fname)
1401 {
1402 FILE *fp = NULL;
1403 char *b = NULL, *p;
1404 struct elfhints_hdr hdr;
1405
1406 if (i + 1 == ARRAY_SIZE(ldpaths))
1407 return i;
1408
1409 if ((fp = fopen(fname, "r")) == NULL)
1410 return i;
1411
1412 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1413 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1414 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1415 {
1416 fclose(fp);
1417 return i;
1418 }
1419
1420 b = (char*)malloc(hdr.dirlistlen+1);
1421 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1422 fclose(fp);
1423 free(b);
1424 return i;
1425 }
1426
1427 while ((p = strsep(&b, ":"))) {
1428 if (*p == '\0') continue;
1429 ldpaths[i++] = xstrdup(p);
1430
1431 if (i + 1 == ARRAY_SIZE(ldpaths))
1432 break;
1433 }
1434 ldpaths[i] = NULL;
1435
1436 free(b);
1437 fclose(fp);
1438 return i;
1439 }
1440
1441 #else
1442
1443 #warning Cache config support not implemented for your target
1444 static int load_ld_cache_config(int i, const char *fname)
1445 {
1446 memset(ldpaths, 0x00, sizeof(ldpaths));
1447 }
1448
1449 #endif
1450
1451 /* scan /etc/ld.so.conf for paths */
1452 static void scanelf_ldpath()
1453 {
1454 char scan_l, scan_ul, scan_ull;
1455 int i = 0;
1456
1457 if (!ldpaths[0])
1458 err("Unable to load any paths from ld.so.conf");
1459
1460 scan_l = scan_ul = scan_ull = 0;
1461
1462 while (ldpaths[i]) {
1463 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
1464 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
1465 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
1466 scanelf_dir(ldpaths[i]);
1467 ++i;
1468 }
1469
1470 if (!scan_l) scanelf_dir("/lib");
1471 if (!scan_ul) scanelf_dir("/usr/lib");
1472 if (!scan_ull) scanelf_dir("/usr/local/lib");
1473 }
1474
1475 /* scan env PATH for paths */
1476 static void scanelf_envpath()
1477 {
1478 char *path, *p;
1479
1480 path = getenv("PATH");
1481 if (!path)
1482 err("PATH is not set in your env !");
1483 path = xstrdup(path);
1484
1485 while ((p = strrchr(path, ':')) != NULL) {
1486 scanelf_dir(p + 1);
1487 *p = 0;
1488 }
1489
1490 free(path);
1491 }
1492
1493 /* usage / invocation handling functions */
1494 #define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:BhV"
1495 #define a_argument required_argument
1496 static struct option const long_opts[] = {
1497 {"path", no_argument, NULL, 'p'},
1498 {"ldpath", no_argument, NULL, 'l'},
1499 {"recursive", no_argument, NULL, 'R'},
1500 {"mount", no_argument, NULL, 'm'},
1501 {"symlink", no_argument, NULL, 'y'},
1502 {"archives", no_argument, NULL, 'A'},
1503 {"ldcache", no_argument, NULL, 'L'},
1504 {"fix", no_argument, NULL, 'X'},
1505 {"setpax", a_argument, NULL, 'z'},
1506 {"pax", no_argument, NULL, 'x'},
1507 {"header", no_argument, NULL, 'e'},
1508 {"textrel", no_argument, NULL, 't'},
1509 {"rpath", no_argument, NULL, 'r'},
1510 {"needed", no_argument, NULL, 'n'},
1511 {"interp", no_argument, NULL, 'i'},
1512 {"bind", no_argument, NULL, 'b'},
1513 {"soname", no_argument, NULL, 'S'},
1514 {"symbol", a_argument, NULL, 's'},
1515 {"section", a_argument, NULL, 'k'},
1516 {"lib", a_argument, NULL, 'N'},
1517 {"gmatch", no_argument, NULL, 'g'},
1518 {"textrels", no_argument, NULL, 'T'},
1519 {"etype", a_argument, NULL, 'E'},
1520 {"bits", a_argument, NULL, 'M'},
1521 {"all", no_argument, NULL, 'a'},
1522 {"quiet", no_argument, NULL, 'q'},
1523 {"verbose", no_argument, NULL, 'v'},
1524 {"format", a_argument, NULL, 'F'},
1525 {"from", a_argument, NULL, 'f'},
1526 {"file", a_argument, NULL, 'o'},
1527 {"nobanner", no_argument, NULL, 'B'},
1528 {"help", no_argument, NULL, 'h'},
1529 {"version", no_argument, NULL, 'V'},
1530 {NULL, no_argument, NULL, 0x0}
1531 };
1532
1533 static const char *opts_help[] = {
1534 "Scan all directories in PATH environment",
1535 "Scan all directories in /etc/ld.so.conf",
1536 "Scan directories recursively",
1537 "Don't recursively cross mount points",
1538 "Don't scan symlinks",
1539 "Scan archives (.a files)",
1540 "Utilize ld.so.cache information (use with -r/-n)",
1541 "Try and 'fix' bad things (use with -r/-e)",
1542 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1543 "Print PaX markings",
1544 "Print GNU_STACK/PT_LOAD markings",
1545 "Print TEXTREL information",
1546 "Print RPATH information",
1547 "Print NEEDED information",
1548 "Print INTERP information",
1549 "Print BIND information",
1550 "Print SONAME information",
1551 "Find a specified symbol",
1552 "Find a specified section",
1553 "Find a specified library",
1554 "Use strncmp to match libraries. (use with -N)",
1555 "Locate cause of TEXTREL",
1556 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1557 "Print only ELF files matching numeric bits",
1558 "Print all scanned info (-x -e -t -r -b)\n",
1559 "Only output 'bad' things",
1560 "Be verbose (can be specified more than once)",
1561 "Use specified format for output",
1562 "Read input stream from a filename",
1563 "Write output stream to a filename",
1564 "Don't display the header",
1565 "Print this help and exit",
1566 "Print version and exit",
1567 NULL
1568 };
1569
1570 /* display usage and exit */
1571 static void usage(int status)
1572 {
1573 unsigned long i;
1574 printf("* Scan ELF binaries for stuff\n\n"
1575 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1576 printf("Options: -[%s]\n", PARSE_FLAGS);
1577 for (i = 0; long_opts[i].name; ++i)
1578 if (long_opts[i].has_arg == no_argument)
1579 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
1580 long_opts[i].name, opts_help[i]);
1581 else
1582 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
1583 long_opts[i].name, opts_help[i]);
1584
1585 if (status != EXIT_SUCCESS)
1586 exit(status);
1587
1588 puts("\nThe format modifiers for the -F option are:");
1589 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1590 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1591 puts(" i INTERP \tb BIND \ts symbol");
1592 puts(" N library \to Type \tT TEXTRELs");
1593 puts(" S SONAME \tk section");
1594 puts(" p filename (with search path removed)");
1595 puts(" f filename (short name/basename)");
1596 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1597
1598 puts("\nELF Etypes:");
1599 print_etypes(stdout);
1600
1601 exit(status);
1602 }
1603
1604 /* parse command line arguments and preform needed actions */
1605 static void parseargs(int argc, char *argv[])
1606 {
1607 int i;
1608 const char *from_file = NULL;
1609
1610 opterr = 0;
1611 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1612 switch (i) {
1613
1614 case 'V':
1615 printf("pax-utils-%s: %s compiled %s\n%s\n"
1616 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
1617 VERSION, __FILE__, __DATE__, rcsid, argv0);
1618 exit(EXIT_SUCCESS);
1619 break;
1620 case 'h': usage(EXIT_SUCCESS); break;
1621 case 'f':
1622 if (from_file) warn("You prob don't want to specify -f twice");
1623 from_file = optarg;
1624 break;
1625 case 'E':
1626 strncpy(match_etypes, optarg, sizeof(match_etypes));
1627 break;
1628 case 'M':
1629 match_bits = atoi(optarg);
1630 break;
1631 case 'o': {
1632 if (freopen(optarg, "w", stdout) == NULL)
1633 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1634 break;
1635 }
1636 case 'k':
1637 if (find_section) warn("You prob don't want to specify -k twice");
1638 find_section = optarg;
1639 break;
1640 case 's': {
1641 if (find_sym) warn("You prob don't want to specify -s twice");
1642 find_sym = optarg;
1643 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1644 sprintf(versioned_symname, "%s@", find_sym);
1645 break;
1646 }
1647 case 'N': {
1648 if (find_lib) warn("You prob don't want to specify -N twice");
1649 find_lib = optarg;
1650 break;
1651 }
1652
1653 case 'F': {
1654 if (out_format) warn("You prob don't want to specify -F twice");
1655 out_format = optarg;
1656 break;
1657 }
1658 case 'z': {
1659 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1660 size_t x;
1661
1662 for (x = 0 ; x < strlen(optarg); x++) {
1663 switch(optarg[x]) {
1664 case 'p':
1665 case 'P':
1666 do_state(optarg[x], PAGEEXEC);
1667 break;
1668 case 's':
1669 case 'S':
1670 do_state(optarg[x], SEGMEXEC);
1671 break;
1672 case 'm':
1673 case 'M':
1674 do_state(optarg[x], MPROTECT);
1675 break;
1676 case 'e':
1677 case 'E':
1678 do_state(optarg[x], EMUTRAMP);
1679 break;
1680 case 'r':
1681 case 'R':
1682 do_state(optarg[x], RANDMMAP);
1683 break;
1684 case 'x':
1685 case 'X':
1686 do_state(optarg[x], RANDEXEC);
1687 break;
1688 default:
1689 break;
1690 }
1691 }
1692 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
1693 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
1694 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
1695 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
1696 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1697 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1698 setpax = flags;
1699 break;
1700 }
1701 case 'g': gmatch = 1; break;
1702 case 'L': use_ldcache = 1; break;
1703 case 'y': scan_symlink = 0; break;
1704 case 'A': scan_archives = 1; break;
1705 case 'B': show_banner = 0; break;
1706 case 'l': scan_ldpath = 1; break;
1707 case 'p': scan_envpath = 1; break;
1708 case 'R': dir_recurse = 1; break;
1709 case 'm': dir_crossmount = 0; break;
1710 case 'X': ++fix_elf; break;
1711 case 'x': show_pax = 1; break;
1712 case 'e': show_phdr = 1; break;
1713 case 't': show_textrel = 1; break;
1714 case 'r': show_rpath = 1; break;
1715 case 'n': show_needed = 1; break;
1716 case 'i': show_interp = 1; break;
1717 case 'b': show_bind = 1; break;
1718 case 'S': show_soname = 1; break;
1719 case 'T': show_textrels = 1; break;
1720 case 'q': be_quiet = 1; break;
1721 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1722 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
1723
1724 case ':':
1725 err("Option '%c' is missing parameter", optopt);
1726 case '?':
1727 err("Unknown option '%c' or argument missing", optopt);
1728 default:
1729 err("Unhandled option '%c'; please report this", i);
1730 }
1731 }
1732
1733 /* let the format option override all other options */
1734 if (out_format) {
1735 show_pax = show_phdr = show_textrel = show_rpath = \
1736 show_needed = show_interp = show_bind = show_soname = \
1737 show_textrels = 0;
1738 for (i = 0; out_format[i]; ++i) {
1739 if (!IS_MODIFIER(out_format[i])) continue;
1740
1741 switch (out_format[++i]) {
1742 case '+': break;
1743 case '%': break;
1744 case '#': break;
1745 case 'F': break;
1746 case 'p': break;
1747 case 'f': break;
1748 case 'k': break;
1749 case 's': break;
1750 case 'N': break;
1751 case 'o': break;
1752 case 'x': show_pax = 1; break;
1753 case 'e': show_phdr = 1; break;
1754 case 't': show_textrel = 1; break;
1755 case 'r': show_rpath = 1; break;
1756 case 'n': show_needed = 1; break;
1757 case 'i': show_interp = 1; break;
1758 case 'b': show_bind = 1; break;
1759 case 'S': show_soname = 1; break;
1760 case 'T': show_textrels = 1; break;
1761 default:
1762 err("Invalid format specifier '%c' (byte %i)",
1763 out_format[i], i+1);
1764 }
1765 }
1766
1767 /* construct our default format */
1768 } else {
1769 size_t fmt_len = 30;
1770 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
1771 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1772 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1773 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1774 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1775 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1776 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1777 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1778 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1779 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1780 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1781 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1782 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1783 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1784 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1785 }
1786 if (be_verbose > 2) printf("Format: %s\n", out_format);
1787
1788 /* now lets actually do the scanning */
1789 if (scan_ldpath || use_ldcache)
1790 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
1791 if (scan_ldpath) scanelf_ldpath();
1792 if (scan_envpath) scanelf_envpath();
1793 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
1794 from_file = "-";
1795 if (from_file) {
1796 scanelf_from_file(from_file);
1797 from_file = *argv;
1798 }
1799 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1800 err("Nothing to scan !?");
1801 while (optind < argc) {
1802 search_path = argv[optind++];
1803 scanelf_dir(search_path);
1804 }
1805
1806 /* clean up */
1807 free(versioned_symname);
1808 for (i = 0; ldpaths[i]; ++i)
1809 free(ldpaths[i]);
1810
1811 if (ldcache != 0)
1812 munmap(ldcache, ldcache_size);
1813 }
1814
1815 static char **get_split_env(const char *envvar)
1816 {
1817 const char *delims = " \t\n";
1818 char **envvals = NULL;
1819 char *env, *s;
1820 int nentry;
1821
1822 if ((env = getenv(envvar)) == NULL)
1823 return NULL;
1824
1825 env = xstrdup(env);
1826 if (env == NULL)
1827 return NULL;
1828
1829 s = strtok(env, delims);
1830 if (s == NULL) {
1831 free(env);
1832 return NULL;
1833 }
1834
1835 nentry = 0;
1836 while (s != NULL) {
1837 ++nentry;
1838 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
1839 envvals[nentry-1] = s;
1840 s = strtok(NULL, delims);
1841 }
1842 envvals[nentry] = NULL;
1843
1844 /* don't want to free(env) as it contains the memory that backs
1845 * the envvals array of strings */
1846 return envvals;
1847 }
1848 static void parseenv()
1849 {
1850 qa_textrels = get_split_env("QA_TEXTRELS");
1851 qa_execstack = get_split_env("QA_EXECSTACK");
1852 qa_wx_load = get_split_env("QA_WX_LOAD");
1853 }
1854 #ifdef __PAX_UTILS_CLEANUP
1855 static void cleanup()
1856 {
1857 free(out_format);
1858 free(qa_textrels);
1859 free(qa_execstack);
1860 free(qa_wx_load);
1861 }
1862 #endif
1863
1864
1865
1866 int main(int argc, char *argv[])
1867 {
1868 if (argc < 2)
1869 usage(EXIT_FAILURE);
1870 parseenv();
1871 parseargs(argc, argv);
1872 fclose(stdout);
1873 #ifdef __PAX_UTILS_CLEANUP
1874 cleanup();
1875 warn("The calls to add/delete heap should be off:\n"
1876 "\t- 1 due to the out_buffer not being freed in scanelf_file()\n"
1877 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
1878 #endif
1879 return EXIT_SUCCESS;
1880 }
1881
1882
1883
1884 /* utility funcs */
1885 static char *xstrdup(const char *s)
1886 {
1887 char *ret = strdup(s);
1888 if (!ret) err("Could not strdup(): %s", strerror(errno));
1889 return ret;
1890 }
1891 static void *xmalloc(size_t size)
1892 {
1893 void *ret = malloc(size);
1894 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1895 return ret;
1896 }
1897 static void *xrealloc(void *ptr, size_t size)
1898 {
1899 void *ret = realloc(ptr, size);
1900 if (!ret) err("Could not realloc() %li bytes", (unsigned long)size);
1901 return ret;
1902 }
1903 static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
1904 {
1905 size_t new_len;
1906
1907 new_len = strlen(*dst) + strlen(src);
1908 if (*curr_len <= new_len) {
1909 *curr_len = new_len + (*curr_len / 2);
1910 *dst = realloc(*dst, *curr_len);
1911 if (!*dst)
1912 err("could not realloc() %li bytes", (unsigned long)*curr_len);
1913 }
1914
1915 if (n)
1916 strncat(*dst, src, n);
1917 else
1918 strcat(*dst, src);
1919 }
1920 static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1921 {
1922 static char my_app[2];
1923 my_app[0] = append;
1924 my_app[1] = '\0';
1925 xstrcat(dst, my_app, curr_len);
1926 }
1927
1928 /* Match filename against entries in matchlist, return TRUE
1929 * if the file is listed */
1930 static int file_matches_list(const char *filename, char **matchlist)
1931 {
1932 char **file;
1933 char *match;
1934 char buf[__PAX_UTILS_PATH_MAX];
1935
1936 if (matchlist == NULL)
1937 return 0;
1938
1939 for (file = matchlist; *file != NULL; file++) {
1940 if (search_path) {
1941 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
1942 match = buf;
1943 } else {
1944 match = *file;
1945 }
1946 if (fnmatch(match, filename, 0) == 0)
1947 return 1;
1948 }
1949 return 0;
1950 }

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