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Revision 1.156 - (show annotations) (download) (as text)
Sun Jun 11 00:23:11 2006 UTC (8 years, 3 months ago) by vapier
Branch: MAIN
Changes since 1.155: +7 -4 lines
File MIME type: text/x-csrc
fix handling of defined/undefined versioned symbols

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 1.155 2006/06/11 00:07:33 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 1.155 2006/06/11 00:07:33 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);
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 *found_phdr = 1; \
272 shown = 1; \
273 memcpy(ret, "!WX", 3); \
274 } \
275 } \
276 }
277 SHOW_PHDR(32)
278 SHOW_PHDR(64)
279
280 if (be_wewy_wewy_quiet || (be_quiet && !shown))
281 return NULL;
282 else
283 return ret;
284 }
285
286 static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
287 {
288 static const char *ret = "TEXTREL";
289 unsigned long i;
290
291 if (!show_textrel && !show_textrels) return NULL;
292
293 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
294
295 if (elf->phdr) {
296 #define SHOW_TEXTREL(B) \
297 if (elf->elf_class == ELFCLASS ## B) { \
298 Elf ## B ## _Dyn *dyn; \
299 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
300 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
301 Elf ## B ## _Off offset; \
302 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
303 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
304 offset = EGET(phdr[i].p_offset); \
305 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
306 dyn = DYN ## B (elf->data + offset); \
307 while (EGET(dyn->d_tag) != DT_NULL) { \
308 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
309 *found_textrel = 1; \
310 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
311 return (be_wewy_wewy_quiet ? NULL : ret); \
312 } \
313 ++dyn; \
314 } \
315 } }
316 SHOW_TEXTREL(32)
317 SHOW_TEXTREL(64)
318 }
319
320 if (be_quiet || be_wewy_wewy_quiet)
321 return NULL;
322 else
323 return " - ";
324 }
325 static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
326 {
327 unsigned long s, r, rmax;
328 void *symtab_void, *strtab_void, *text_void;
329
330 if (!show_textrels) return NULL;
331
332 /* don't search for TEXTREL's if the ELF doesn't have any */
333 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
334 if (!*found_textrel) return NULL;
335
336 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
337 text_void = elf_findsecbyname(elf, ".text");
338
339 if (symtab_void && strtab_void && text_void && elf->shdr) {
340 #define SHOW_TEXTRELS(B) \
341 if (elf->elf_class == ELFCLASS ## B) { \
342 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
343 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
344 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
345 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
346 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
347 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
348 uint ## B ## _t memsz = EGET(text->sh_size); \
349 Elf ## B ## _Rel *rel; \
350 Elf ## B ## _Rela *rela; \
351 /* search the section headers for relocations */ \
352 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
353 uint32_t sh_type = EGET(shdr[s].sh_type); \
354 if (sh_type == SHT_REL) { \
355 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \
356 rela = NULL; \
357 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
358 } else if (sh_type == SHT_RELA) { \
359 rel = NULL; \
360 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \
361 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
362 } else \
363 continue; \
364 /* now see if any of the relocs are in the .text */ \
365 for (r = 0; r < rmax; ++r) { \
366 unsigned long sym_max; \
367 Elf ## B ## _Addr offset_tmp; \
368 Elf ## B ## _Sym *func; \
369 Elf ## B ## _Sym *sym; \
370 Elf ## B ## _Addr r_offset; \
371 uint ## B ## _t r_info; \
372 if (sh_type == SHT_REL) { \
373 r_offset = EGET(rel[r].r_offset); \
374 r_info = EGET(rel[r].r_info); \
375 } else { \
376 r_offset = EGET(rela[r].r_offset); \
377 r_info = EGET(rela[r].r_info); \
378 } \
379 /* make sure this relocation is inside of the .text */ \
380 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
381 if (be_verbose <= 2) continue; \
382 } else \
383 *found_textrels = 1; \
384 /* locate this relocation symbol name */ \
385 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
386 if ((void*)sym > (void*)elf->data_end) { \
387 warn("%s: corrupt ELF symbol", elf->filename); \
388 continue; \
389 } \
390 sym_max = ELF ## B ## _R_SYM(r_info); \
391 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
392 sym += sym_max; \
393 else \
394 sym = NULL; \
395 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
396 /* show the raw details about this reloc */ \
397 printf(" %s: ", elf->base_filename); \
398 if (sym && sym->st_name) \
399 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \
400 else \
401 printf("(memory/fake?)"); \
402 printf(" [0x%lX]", (unsigned long)r_offset); \
403 /* now try to find the closest symbol that this rel is probably in */ \
404 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
405 func = NULL; \
406 offset_tmp = 0; \
407 while (sym_max--) { \
408 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
409 func = sym; \
410 offset_tmp = EGET(sym->st_value); \
411 } \
412 ++sym; \
413 } \
414 printf(" in "); \
415 if (func && func->st_name) \
416 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \
417 else \
418 printf("(NULL: fake?)"); \
419 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
420 } \
421 } }
422 SHOW_TEXTRELS(32)
423 SHOW_TEXTRELS(64)
424 }
425 if (!*found_textrels)
426 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
427
428 return NULL;
429 }
430
431 static void rpath_security_checks(elfobj *, char *, const char *);
432 static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
433 {
434 struct stat st;
435 switch (*item) {
436 case '/': break;
437 case '.':
438 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
439 break;
440 case ':':
441 case '\0':
442 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
443 break;
444 case '$':
445 if (fstat(elf->fd, &st) != -1)
446 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
447 warnf("Security problem with %s='%s' in %s with mode set of %o",
448 dt_type, item, elf->filename, st.st_mode & 07777);
449 break;
450 default:
451 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
452 break;
453 }
454 }
455 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
456 {
457 unsigned long i, s;
458 char *rpath, *runpath, **r;
459 void *strtbl_void;
460
461 if (!show_rpath) return;
462
463 strtbl_void = elf_findsecbyname(elf, ".dynstr");
464 rpath = runpath = NULL;
465
466 if (elf->phdr && strtbl_void) {
467 #define SHOW_RPATH(B) \
468 if (elf->elf_class == ELFCLASS ## B) { \
469 Elf ## B ## _Dyn *dyn; \
470 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
471 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
472 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
473 Elf ## B ## _Off offset; \
474 Elf ## B ## _Xword word; \
475 /* Scan all the program headers */ \
476 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
477 /* Just scan dynamic headers */ \
478 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
479 offset = EGET(phdr[i].p_offset); \
480 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
481 /* Just scan dynamic RPATH/RUNPATH headers */ \
482 dyn = DYN ## B (elf->data + offset); \
483 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
484 if (word == DT_RPATH) { \
485 r = &rpath; \
486 } else if (word == DT_RUNPATH) { \
487 r = &runpath; \
488 } else { \
489 ++dyn; \
490 continue; \
491 } \
492 /* Verify the memory is somewhat sane */ \
493 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
494 if (offset < (Elf ## B ## _Off)elf->len) { \
495 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
496 *r = (char*)(elf->data + offset); \
497 /* cache the length in case we need to nuke this section later on */ \
498 if (fix_elf) \
499 offset = strlen(*r); \
500 /* If quiet, don't output paths in ld.so.conf */ \
501 if (be_quiet) { \
502 size_t len; \
503 char *start, *end; \
504 /* note that we only 'chop' off leading known paths. */ \
505 /* since *r is read-only memory, we can only move the ptr forward. */ \
506 start = *r; \
507 /* scan each path in : delimited list */ \
508 while (start) { \
509 rpath_security_checks(elf, start, get_elfdtype(word)); \
510 end = strchr(start, ':'); \
511 len = (end ? abs(end - start) : strlen(start)); \
512 if (use_ldcache) \
513 for (s = 0; ldpaths[s]; ++s) \
514 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
515 *r = end; \
516 /* corner case ... if RPATH reads "/usr/lib:", we want \
517 * to show ':' rather than '' */ \
518 if (end && end[1] != '\0') \
519 (*r)++; \
520 break; \
521 } \
522 if (!*r || !end) \
523 break; \
524 else \
525 start = start + len + 1; \
526 } \
527 } \
528 if (*r) { \
529 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
530 /* just nuke it */ \
531 nuke_it##B: \
532 memset(*r, 0x00, offset); \
533 *r = NULL; \
534 ESET(dyn->d_tag, DT_DEBUG); \
535 ESET(dyn->d_un.d_ptr, 0); \
536 } else if (fix_elf) { \
537 /* try to clean "bad" paths */ \
538 size_t len, tmpdir_len; \
539 char *start, *end; \
540 const char *tmpdir; \
541 start = *r; \
542 tmpdir = (getenv("TMPDIR") ? : "."); \
543 tmpdir_len = strlen(tmpdir); \
544 while (1) { \
545 end = strchr(start, ':'); \
546 if (start == end) { \
547 eat_this_path##B: \
548 len = strlen(end); \
549 memmove(start, end+1, len); \
550 start[len-1] = '\0'; \
551 end = start - 1; \
552 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
553 if (!end) { \
554 if (start == *r) \
555 goto nuke_it##B; \
556 *--start = '\0'; \
557 } else \
558 goto eat_this_path##B; \
559 } \
560 if (!end) \
561 break; \
562 start = end + 1; \
563 } \
564 if (**r == '\0') \
565 goto nuke_it##B; \
566 } \
567 if (*r) \
568 *found_rpath = 1; \
569 } \
570 } \
571 ++dyn; \
572 } \
573 } }
574 SHOW_RPATH(32)
575 SHOW_RPATH(64)
576 }
577
578 if (be_wewy_wewy_quiet) return;
579
580 if (rpath && runpath) {
581 if (!strcmp(rpath, runpath)) {
582 xstrcat(ret, runpath, ret_len);
583 } else {
584 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
585 xchrcat(ret, '{', ret_len);
586 xstrcat(ret, rpath, ret_len);
587 xchrcat(ret, ',', ret_len);
588 xstrcat(ret, runpath, ret_len);
589 xchrcat(ret, '}', ret_len);
590 }
591 } else if (rpath || runpath)
592 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
593 else if (!be_quiet)
594 xstrcat(ret, " - ", ret_len);
595 }
596
597 #define LDSO_CACHE_MAGIC "ld.so-"
598 #define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
599 #define LDSO_CACHE_VER "1.7.0"
600 #define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
601 #define FLAG_ANY -1
602 #define FLAG_TYPE_MASK 0x00ff
603 #define FLAG_LIBC4 0x0000
604 #define FLAG_ELF 0x0001
605 #define FLAG_ELF_LIBC5 0x0002
606 #define FLAG_ELF_LIBC6 0x0003
607 #define FLAG_REQUIRED_MASK 0xff00
608 #define FLAG_SPARC_LIB64 0x0100
609 #define FLAG_IA64_LIB64 0x0200
610 #define FLAG_X8664_LIB64 0x0300
611 #define FLAG_S390_LIB64 0x0400
612 #define FLAG_POWERPC_LIB64 0x0500
613 #define FLAG_MIPS64_LIBN32 0x0600
614 #define FLAG_MIPS64_LIBN64 0x0700
615
616 static char *lookup_cache_lib(elfobj *, char *);
617
618 #if defined(__GLIBC__) || defined(__UCLIBC__)
619
620 static char *lookup_cache_lib(elfobj *elf, char *fname)
621 {
622 int fd = 0;
623 char *strs;
624 static char buf[__PAX_UTILS_PATH_MAX] = "";
625 const char *cachefile = "/etc/ld.so.cache";
626 struct stat st;
627
628 typedef struct {
629 char magic[LDSO_CACHE_MAGIC_LEN];
630 char version[LDSO_CACHE_VER_LEN];
631 int nlibs;
632 } header_t;
633 header_t *header;
634
635 typedef struct {
636 int flags;
637 int sooffset;
638 int liboffset;
639 } libentry_t;
640 libentry_t *libent;
641
642 if (fname == NULL)
643 return NULL;
644
645 if (ldcache == 0) {
646 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1)
647 return NULL;
648
649 /* cache these values so we only map/unmap the cache file once */
650 ldcache_size = st.st_size;
651 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
652
653 close(fd);
654
655 if (ldcache == (caddr_t)-1) {
656 ldcache = 0;
657 return NULL;
658 }
659
660 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
661 return NULL;
662 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
663 return NULL;
664 }
665
666 header = (header_t *) ldcache;
667 libent = (libentry_t *) (ldcache + sizeof(header_t));
668 strs = (char *) &libent[header->nlibs];
669
670 for (fd = 0; fd < header->nlibs; fd++) {
671 /* this should be more fine grained, but for now we assume that
672 * diff arches will not be cached together. and we ignore the
673 * the different multilib mips cases. */
674 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
675 continue;
676 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
677 continue;
678
679 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
680 continue;
681 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
682 }
683 return buf;
684 }
685 #elif defined(__NetBSD__)
686 static char *lookup_cache_lib(elfobj *elf, char *fname)
687 {
688 static char buf[__PAX_UTILS_PATH_MAX] = "";
689 static struct stat st;
690
691 char **ldpath;
692 for (ldpath = ldpaths; *ldpath != NULL; ldpath++) {
693 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", *ldpath, fname) >= sizeof(buf))
694 continue; /* if the pathname is too long, or something went wrong, ignore */
695
696 if (stat(buf, &st) != 0)
697 continue; /* if the lib doesn't exist in *ldpath, look further */
698
699 /* NetBSD doesn't actually do sanity checks, it just loads the file
700 * and if that doesn't work, continues looking in other directories.
701 * This cannot easily be safely emulated, unfortunately. For now,
702 * just assume that if it exists, it's a valid library. */
703
704 return buf;
705 }
706
707 /* not found in any path */
708 return NULL;
709 }
710 #else
711 #warning Cache support not implemented for your target
712 static char *lookup_cache_lib(elfobj *elf, char *fname)
713 {
714 return NULL;
715 }
716 #endif
717
718 static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
719 {
720 unsigned long i;
721 char *needed;
722 void *strtbl_void;
723 char *p;
724
725 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
726
727 strtbl_void = elf_findsecbyname(elf, ".dynstr");
728
729 if (elf->phdr && strtbl_void) {
730 #define SHOW_NEEDED(B) \
731 if (elf->elf_class == ELFCLASS ## B) { \
732 Elf ## B ## _Dyn *dyn; \
733 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
734 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
735 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
736 Elf ## B ## _Off offset; \
737 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
738 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
739 offset = EGET(phdr[i].p_offset); \
740 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
741 dyn = DYN ## B (elf->data + offset); \
742 while (EGET(dyn->d_tag) != DT_NULL) { \
743 if (EGET(dyn->d_tag) == DT_NEEDED) { \
744 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
745 if (offset >= (Elf ## B ## _Off)elf->len) { \
746 ++dyn; \
747 continue; \
748 } \
749 needed = (char*)(elf->data + offset); \
750 if (op == 0) { \
751 if (!be_wewy_wewy_quiet) { \
752 if (*found_needed) xchrcat(ret, ',', ret_len); \
753 if (use_ldcache) \
754 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
755 needed = p; \
756 xstrcat(ret, needed, ret_len); \
757 } \
758 *found_needed = 1; \
759 } else { \
760 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \
761 *found_lib = 1; \
762 return (be_wewy_wewy_quiet ? NULL : needed); \
763 } \
764 } \
765 } \
766 ++dyn; \
767 } \
768 } }
769 SHOW_NEEDED(32)
770 SHOW_NEEDED(64)
771 if (op == 0 && !*found_needed && be_verbose)
772 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
773 }
774
775 return NULL;
776 }
777 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
778 {
779 void *strtbl_void;
780
781 if (!show_interp) return NULL;
782
783 strtbl_void = elf_findsecbyname(elf, ".interp");
784
785 if (strtbl_void) {
786 #define SHOW_INTERP(B) \
787 if (elf->elf_class == ELFCLASS ## B) { \
788 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
789 *found_interp = 1; \
790 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
791 }
792 SHOW_INTERP(32)
793 SHOW_INTERP(64)
794 }
795 return NULL;
796 }
797 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
798 {
799 unsigned long i;
800 struct stat s;
801 char dynamic = 0;
802
803 if (!show_bind) return NULL;
804 if (!elf->phdr) return NULL;
805
806 #define SHOW_BIND(B) \
807 if (elf->elf_class == ELFCLASS ## B) { \
808 Elf ## B ## _Dyn *dyn; \
809 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
810 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
811 Elf ## B ## _Off offset; \
812 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
813 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
814 dynamic = 1; \
815 offset = EGET(phdr[i].p_offset); \
816 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
817 dyn = DYN ## B (elf->data + offset); \
818 while (EGET(dyn->d_tag) != DT_NULL) { \
819 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
820 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
821 { \
822 if (be_quiet) return NULL; \
823 *found_bind = 1; \
824 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
825 } \
826 ++dyn; \
827 } \
828 } \
829 }
830 SHOW_BIND(32)
831 SHOW_BIND(64)
832
833 if (be_wewy_wewy_quiet) return NULL;
834
835 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) {
836 return NULL;
837 } else {
838 *found_bind = 1;
839 return (char *) (dynamic ? "LAZY" : "STATIC");
840 }
841 }
842 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
843 {
844 unsigned long i;
845 char *soname;
846 void *strtbl_void;
847
848 if (!show_soname) return NULL;
849
850 strtbl_void = elf_findsecbyname(elf, ".dynstr");
851
852 if (elf->phdr && strtbl_void) {
853 #define SHOW_SONAME(B) \
854 if (elf->elf_class == ELFCLASS ## B) { \
855 Elf ## B ## _Dyn *dyn; \
856 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
857 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
858 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
859 Elf ## B ## _Off offset; \
860 /* only look for soname in shared objects */ \
861 if (ehdr->e_type != ET_DYN) \
862 return NULL; \
863 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
864 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
865 offset = EGET(phdr[i].p_offset); \
866 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
867 dyn = DYN ## B (elf->data + offset); \
868 while (EGET(dyn->d_tag) != DT_NULL) { \
869 if (EGET(dyn->d_tag) == DT_SONAME) { \
870 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
871 if (offset >= (Elf ## B ## _Off)elf->len) { \
872 ++dyn; \
873 continue; \
874 } \
875 soname = (char*)(elf->data + offset); \
876 *found_soname = 1; \
877 return (be_wewy_wewy_quiet ? NULL : soname); \
878 } \
879 ++dyn; \
880 } \
881 } }
882 SHOW_SONAME(32)
883 SHOW_SONAME(64)
884 }
885
886 return NULL;
887 }
888 static char *scanelf_file_sym(elfobj *elf, char *found_sym)
889 {
890 unsigned long i;
891 char *ret;
892 void *symtab_void, *strtab_void;
893
894 if (!find_sym) return NULL;
895 ret = find_sym;
896
897 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
898
899 if (symtab_void && strtab_void) {
900 #define FIND_SYM(B) \
901 if (elf->elf_class == ELFCLASS ## B) { \
902 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
903 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
904 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
905 unsigned long cnt = EGET(symtab->sh_entsize); \
906 char *symname; \
907 if (cnt) \
908 cnt = EGET(symtab->sh_size) / cnt; \
909 for (i = 0; i < cnt; ++i) { \
910 if (sym->st_name) { \
911 /* make sure the symbol name is in acceptable memory range */ \
912 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
913 if ((void*)symname > (void*)elf->data_end) { \
914 warnf("%s: corrupt ELF symbols", elf->filename); \
915 ++sym; \
916 continue; \
917 } \
918 /* debug display ... show all symbols and some extra info */ \
919 if (*ret == '*') { \
920 printf("%s(%s) %5lX %15s %s\n", \
921 ((*found_sym == 0) ? "\n\t" : "\t"), \
922 elf->base_filename, \
923 (unsigned long)sym->st_size, \
924 get_elfstttype(sym->st_info), \
925 symname); \
926 *found_sym = 1; \
927 } else { \
928 /* allow the user to specify a comma delimited list of symbols to search for */ \
929 char *this_sym, *this_sym_ver, *next_sym; \
930 this_sym = ret; \
931 this_sym_ver = versioned_symname; \
932 do { \
933 next_sym = strchr(this_sym, ','); \
934 if (next_sym == NULL) \
935 next_sym = this_sym + strlen(this_sym); \
936 /* do we want a defined symbol ? */ \
937 if (*this_sym == '+') { \
938 if (sym->st_shndx == SHN_UNDEF) \
939 goto skip_this_sym##B; \
940 ++this_sym; \
941 ++this_sym_ver; \
942 /* do we want an undefined symbol ? */ \
943 } else if (*this_sym == '-') { \
944 if (sym->st_shndx != SHN_UNDEF) \
945 goto skip_this_sym##B; \
946 ++this_sym; \
947 ++this_sym_ver; \
948 } \
949 /* ok, lets compare the name now */ \
950 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
951 (strncmp(this_sym_ver, symname, strlen(this_sym_ver)) == 0)) { \
952 if (be_semi_verbose) { \
953 char buf[126]; \
954 snprintf(buf, sizeof(buf), "%lX %s %s", \
955 (unsigned long)sym->st_size, get_elfstttype(sym->st_info), this_sym); \
956 ret = buf; \
957 } else \
958 ret = this_sym; \
959 (*found_sym)++; \
960 goto break_out; \
961 } \
962 skip_this_sym##B: this_sym = next_sym + 1; \
963 } while (*next_sym != '\0'); \
964 } \
965 } \
966 ++sym; \
967 } }
968 FIND_SYM(32)
969 FIND_SYM(64)
970 }
971
972 break_out:
973 if (be_wewy_wewy_quiet) return NULL;
974
975 if (*find_sym != '*' && *found_sym)
976 return ret;
977 if (be_quiet)
978 return NULL;
979 else
980 return (char *)" - ";
981 }
982
983
984 static char *scanelf_file_sections(elfobj *elf, char *found_section)
985 {
986 if (!find_section)
987 return NULL;
988
989 #define FIND_SECTION(B) \
990 if (elf->elf_class == ELFCLASS ## B) { \
991 int invert; \
992 Elf ## B ## _Shdr *section; \
993 invert = (*find_section == '!' ? 1 : 0); \
994 section = SHDR ## B (elf_findsecbyname(elf, find_section+invert)); \
995 if ((section == NULL && invert) || (section != NULL && !invert)) \
996 *found_section = 1; \
997 }
998 FIND_SECTION(32)
999 FIND_SECTION(64)
1000
1001 if (be_wewy_wewy_quiet)
1002 return NULL;
1003
1004 if (*found_section)
1005 return find_section;
1006
1007 if (be_quiet)
1008 return NULL;
1009 else
1010 return (char *)" - ";
1011 }
1012
1013 /* scan an elf file and show all the fun stuff */
1014 #define prints(str) write(fileno(stdout), str, strlen(str))
1015 static int scanelf_elfobj(elfobj *elf)
1016 {
1017 unsigned long i;
1018 char found_pax, found_phdr, found_relro, found_load, found_textrel,
1019 found_rpath, found_needed, found_interp, found_bind, found_soname,
1020 found_sym, found_lib, found_file, found_textrels, found_section;
1021 static char *out_buffer = NULL;
1022 static size_t out_len;
1023
1024 found_pax = found_phdr = found_relro = found_load = found_textrel = \
1025 found_rpath = found_needed = found_interp = found_bind = found_soname = \
1026 found_sym = found_lib = found_file = found_textrels = found_section = 0;
1027
1028 if (be_verbose > 2)
1029 printf("%s: scanning file {%s,%s}\n", elf->filename,
1030 get_elfeitype(EI_CLASS, elf->elf_class),
1031 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
1032 else if (be_verbose > 1)
1033 printf("%s: scanning file\n", elf->filename);
1034
1035 /* init output buffer */
1036 if (!out_buffer) {
1037 out_len = sizeof(char) * 80;
1038 out_buffer = (char*)xmalloc(out_len);
1039 }
1040 *out_buffer = '\0';
1041
1042 /* show the header */
1043 if (!be_quiet && show_banner) {
1044 for (i = 0; out_format[i]; ++i) {
1045 if (!IS_MODIFIER(out_format[i])) continue;
1046
1047 switch (out_format[++i]) {
1048 case '+': break;
1049 case '%': break;
1050 case '#': break;
1051 case 'F':
1052 case 'p':
1053 case 'f': prints("FILE "); found_file = 1; break;
1054 case 'o': prints(" TYPE "); break;
1055 case 'x': prints(" PAX "); break;
1056 case 'e': prints("STK/REL/PTL "); break;
1057 case 't': prints("TEXTREL "); break;
1058 case 'r': prints("RPATH "); break;
1059 case 'n': prints("NEEDED "); break;
1060 case 'i': prints("INTERP "); break;
1061 case 'b': prints("BIND "); break;
1062 case 'S': prints("SONAME "); break;
1063 case 's': prints("SYM "); break;
1064 case 'N': prints("LIB "); break;
1065 case 'T': prints("TEXTRELS "); break;
1066 case 'k': prints("SECTION "); break;
1067 default: warnf("'%c' has no title ?", out_format[i]);
1068 }
1069 }
1070 if (!found_file) prints("FILE ");
1071 prints("\n");
1072 found_file = 0;
1073 show_banner = 0;
1074 }
1075
1076 /* dump all the good stuff */
1077 for (i = 0; out_format[i]; ++i) {
1078 const char *out;
1079 const char *tmp;
1080
1081 if (!IS_MODIFIER(out_format[i])) {
1082 xchrcat(&out_buffer, out_format[i], &out_len);
1083 continue;
1084 }
1085
1086 out = NULL;
1087 be_wewy_wewy_quiet = (out_format[i] == '#');
1088 be_semi_verbose = (out_format[i] == '+');
1089 switch (out_format[++i]) {
1090 case '+':
1091 case '%':
1092 case '#':
1093 xchrcat(&out_buffer, out_format[i], &out_len); break;
1094 case 'F':
1095 found_file = 1;
1096 if (be_wewy_wewy_quiet) break;
1097 xstrcat(&out_buffer, elf->filename, &out_len);
1098 break;
1099 case 'p':
1100 found_file = 1;
1101 if (be_wewy_wewy_quiet) break;
1102 tmp = elf->filename;
1103 if (search_path) {
1104 ssize_t len_search = strlen(search_path);
1105 ssize_t len_file = strlen(elf->filename);
1106 if (!strncmp(elf->filename, search_path, len_search) && \
1107 len_file > len_search)
1108 tmp += len_search;
1109 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1110 }
1111 xstrcat(&out_buffer, tmp, &out_len);
1112 break;
1113 case 'f':
1114 found_file = 1;
1115 if (be_wewy_wewy_quiet) break;
1116 tmp = strrchr(elf->filename, '/');
1117 tmp = (tmp == NULL ? elf->filename : tmp+1);
1118 xstrcat(&out_buffer, tmp, &out_len);
1119 break;
1120 case 'o': out = get_elfetype(elf); break;
1121 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
1122 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
1123 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1124 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
1125 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1126 case 'n':
1127 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
1128 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1129 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1130 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
1131 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1132 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1133 default: warnf("'%c' has no scan code?", out_format[i]);
1134 }
1135 if (out) {
1136 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
1137 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
1138 xstrncat(&out_buffer, out, &out_len, (tmp-out));
1139 else
1140 xstrcat(&out_buffer, out, &out_len);
1141 }
1142 }
1143
1144 #define FOUND_SOMETHING() \
1145 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1146 found_rpath || found_needed || found_interp || found_bind || \
1147 found_soname || found_sym || found_lib || found_textrels || found_section )
1148
1149 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1150 xchrcat(&out_buffer, ' ', &out_len);
1151 xstrcat(&out_buffer, elf->filename, &out_len);
1152 }
1153 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
1154 puts(out_buffer);
1155 fflush(stdout);
1156 }
1157
1158 return 0;
1159 }
1160
1161 /* scan a single elf */
1162 static int scanelf_elf(const char *filename, int fd, size_t len)
1163 {
1164 int ret = 1;
1165 elfobj *elf;
1166
1167 /* verify this is real ELF */
1168 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1169 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1170 return ret;
1171 }
1172 switch (match_bits) {
1173 case 32:
1174 if (elf->elf_class != ELFCLASS32)
1175 goto label_done;
1176 break;
1177 case 64:
1178 if (elf->elf_class != ELFCLASS64)
1179 goto label_done;
1180 break;
1181 default: break;
1182 }
1183 if (strlen(match_etypes)) {
1184 char sbuf[126];
1185 strncpy(sbuf, match_etypes, sizeof(sbuf));
1186 if (strchr(match_etypes, ',') != NULL) {
1187 char *p;
1188 while((p = strrchr(sbuf, ',')) != NULL) {
1189 *p = 0;
1190 if (etype_lookup(p+1) == get_etype(elf))
1191 goto label_ret;
1192 }
1193 }
1194 if (etype_lookup(sbuf) != get_etype(elf))
1195 goto label_done;
1196 }
1197
1198 label_ret:
1199 ret = scanelf_elfobj(elf);
1200
1201 label_done:
1202 unreadelf(elf);
1203 return ret;
1204 }
1205
1206 /* scan an archive of elfs */
1207 static int scanelf_archive(const char *filename, int fd, size_t len)
1208 {
1209 archive_handle *ar;
1210 archive_member *m;
1211 char *ar_buffer;
1212 elfobj *elf;
1213
1214 ar = ar_open_fd(filename, fd);
1215 if (ar == NULL)
1216 return 1;
1217
1218 ar_buffer = (char*)mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1219 while ((m=ar_next(ar)) != NULL) {
1220 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size);
1221 if (elf) {
1222 scanelf_elfobj(elf);
1223 unreadelf(elf);
1224 }
1225 }
1226 munmap(ar_buffer, len);
1227
1228 return 0;
1229 }
1230 /* scan a file which may be an elf or an archive or some other magical beast */
1231 static void scanelf_file(const char *filename)
1232 {
1233 struct stat st;
1234 int fd;
1235
1236 /* make sure 'filename' exists */
1237 if (lstat(filename, &st) == -1) {
1238 if (be_verbose > 2) printf("%s: does not exist\n", filename);
1239 return;
1240 }
1241
1242 /* always handle regular files and handle symlinked files if no -y */
1243 if (S_ISLNK(st.st_mode)) {
1244 if (!scan_symlink) return;
1245 stat(filename, &st);
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);
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);
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 } else
1382 abort();
1383 }
1384 #endif
1385 if (*path != '/')
1386 continue;
1387
1388 ldpaths[i++] = xstrdup(path);
1389
1390 if (i + 1 == ARRAY_SIZE(ldpaths))
1391 break;
1392 }
1393 ldpaths[i] = NULL;
1394
1395 fclose(fp);
1396 return i;
1397 }
1398
1399 #elif defined(__FreeBSD__) || (__DragonFly__)
1400
1401 static int load_ld_cache_config(int i, const char *fname)
1402 {
1403 FILE *fp = NULL;
1404 char *b = NULL, *p;
1405 struct elfhints_hdr hdr;
1406
1407 if (i + 1 == ARRAY_SIZE(ldpaths))
1408 return i;
1409
1410 if ((fp = fopen(fname, "r")) == NULL)
1411 return i;
1412
1413 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1414 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1415 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1416 {
1417 fclose(fp);
1418 return i;
1419 }
1420
1421 b = (char*)malloc(hdr.dirlistlen+1);
1422 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1423 fclose(fp);
1424 free(b);
1425 return i;
1426 }
1427
1428 while ((p = strsep(&b, ":"))) {
1429 if (*p == '\0') continue;
1430 ldpaths[i++] = xstrdup(p);
1431
1432 if (i + 1 == ARRAY_SIZE(ldpaths))
1433 break;
1434 }
1435 ldpaths[i] = NULL;
1436
1437 free(b);
1438 fclose(fp);
1439 return i;
1440 }
1441
1442 #else
1443
1444 #warning Cache config support not implemented for your target
1445 static int load_ld_cache_config(int i, const char *fname)
1446 {
1447 memset(ldpaths, 0x00, sizeof(ldpaths));
1448 }
1449
1450 #endif
1451
1452 /* scan /etc/ld.so.conf for paths */
1453 static void scanelf_ldpath()
1454 {
1455 char scan_l, scan_ul, scan_ull;
1456 int i = 0;
1457
1458 if (!ldpaths[0])
1459 err("Unable to load any paths from ld.so.conf");
1460
1461 scan_l = scan_ul = scan_ull = 0;
1462
1463 while (ldpaths[i]) {
1464 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
1465 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
1466 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
1467 scanelf_dir(ldpaths[i]);
1468 ++i;
1469 }
1470
1471 if (!scan_l) scanelf_dir("/lib");
1472 if (!scan_ul) scanelf_dir("/usr/lib");
1473 if (!scan_ull) scanelf_dir("/usr/local/lib");
1474 }
1475
1476 /* scan env PATH for paths */
1477 static void scanelf_envpath()
1478 {
1479 char *path, *p;
1480
1481 path = getenv("PATH");
1482 if (!path)
1483 err("PATH is not set in your env !");
1484 path = xstrdup(path);
1485
1486 while ((p = strrchr(path, ':')) != NULL) {
1487 scanelf_dir(p + 1);
1488 *p = 0;
1489 }
1490
1491 free(path);
1492 }
1493
1494 /* usage / invocation handling functions */
1495 #define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:BhV"
1496 #define a_argument required_argument
1497 static struct option const long_opts[] = {
1498 {"path", no_argument, NULL, 'p'},
1499 {"ldpath", no_argument, NULL, 'l'},
1500 {"recursive", no_argument, NULL, 'R'},
1501 {"mount", no_argument, NULL, 'm'},
1502 {"symlink", no_argument, NULL, 'y'},
1503 {"archives", no_argument, NULL, 'A'},
1504 {"ldcache", no_argument, NULL, 'L'},
1505 {"fix", no_argument, NULL, 'X'},
1506 {"setpax", a_argument, NULL, 'z'},
1507 {"pax", no_argument, NULL, 'x'},
1508 {"header", no_argument, NULL, 'e'},
1509 {"textrel", no_argument, NULL, 't'},
1510 {"rpath", no_argument, NULL, 'r'},
1511 {"needed", no_argument, NULL, 'n'},
1512 {"interp", no_argument, NULL, 'i'},
1513 {"bind", no_argument, NULL, 'b'},
1514 {"soname", no_argument, NULL, 'S'},
1515 {"symbol", a_argument, NULL, 's'},
1516 {"section", a_argument, NULL, 'k'},
1517 {"lib", a_argument, NULL, 'N'},
1518 {"gmatch", no_argument, NULL, 'g'},
1519 {"textrels", no_argument, NULL, 'T'},
1520 {"etype", a_argument, NULL, 'E'},
1521 {"bits", a_argument, NULL, 'M'},
1522 {"all", no_argument, NULL, 'a'},
1523 {"quiet", no_argument, NULL, 'q'},
1524 {"verbose", no_argument, NULL, 'v'},
1525 {"format", a_argument, NULL, 'F'},
1526 {"from", a_argument, NULL, 'f'},
1527 {"file", a_argument, NULL, 'o'},
1528 {"nobanner", no_argument, NULL, 'B'},
1529 {"help", no_argument, NULL, 'h'},
1530 {"version", no_argument, NULL, 'V'},
1531 {NULL, no_argument, NULL, 0x0}
1532 };
1533
1534 static const char *opts_help[] = {
1535 "Scan all directories in PATH environment",
1536 "Scan all directories in /etc/ld.so.conf",
1537 "Scan directories recursively",
1538 "Don't recursively cross mount points",
1539 "Don't scan symlinks",
1540 "Scan archives (.a files)",
1541 "Utilize ld.so.cache information (use with -r/-n)",
1542 "Try and 'fix' bad things (use with -r/-e)",
1543 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1544 "Print PaX markings",
1545 "Print GNU_STACK/PT_LOAD markings",
1546 "Print TEXTREL information",
1547 "Print RPATH information",
1548 "Print NEEDED information",
1549 "Print INTERP information",
1550 "Print BIND information",
1551 "Print SONAME information",
1552 "Find a specified symbol",
1553 "Find a specified section",
1554 "Find a specified library",
1555 "Use strncmp to match libraries. (use with -N)",
1556 "Locate cause of TEXTREL",
1557 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1558 "Print only ELF files matching numeric bits",
1559 "Print all scanned info (-x -e -t -r -b)\n",
1560 "Only output 'bad' things",
1561 "Be verbose (can be specified more than once)",
1562 "Use specified format for output",
1563 "Read input stream from a filename",
1564 "Write output stream to a filename",
1565 "Don't display the header",
1566 "Print this help and exit",
1567 "Print version and exit",
1568 NULL
1569 };
1570
1571 /* display usage and exit */
1572 static void usage(int status)
1573 {
1574 unsigned long i;
1575 printf("* Scan ELF binaries for stuff\n\n"
1576 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1577 printf("Options: -[%s]\n", PARSE_FLAGS);
1578 for (i = 0; long_opts[i].name; ++i)
1579 if (long_opts[i].has_arg == no_argument)
1580 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
1581 long_opts[i].name, opts_help[i]);
1582 else
1583 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
1584 long_opts[i].name, opts_help[i]);
1585
1586 if (status != EXIT_SUCCESS)
1587 exit(status);
1588
1589 puts("\nThe format modifiers for the -F option are:");
1590 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1591 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1592 puts(" i INTERP \tb BIND \ts symbol");
1593 puts(" N library \to Type \tT TEXTRELs");
1594 puts(" S SONAME \tk section");
1595 puts(" p filename (with search path removed)");
1596 puts(" f filename (short name/basename)");
1597 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1598
1599 puts("\nELF Etypes:");
1600 print_etypes(stdout);
1601
1602 exit(status);
1603 }
1604
1605 /* parse command line arguments and preform needed actions */
1606 static void parseargs(int argc, char *argv[])
1607 {
1608 int i;
1609 const char *from_file = NULL;
1610
1611 opterr = 0;
1612 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1613 switch (i) {
1614
1615 case 'V':
1616 printf("pax-utils-%s: %s compiled %s\n%s\n"
1617 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
1618 VERSION, __FILE__, __DATE__, rcsid, argv0);
1619 exit(EXIT_SUCCESS);
1620 break;
1621 case 'h': usage(EXIT_SUCCESS); break;
1622 case 'f':
1623 if (from_file) warn("You prob don't want to specify -f twice");
1624 from_file = optarg;
1625 break;
1626 case 'E':
1627 strncpy(match_etypes, optarg, sizeof(match_etypes));
1628 break;
1629 case 'M':
1630 match_bits = atoi(optarg);
1631 break;
1632 case 'o': {
1633 if (freopen(optarg, "w", stdout) == NULL)
1634 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1635 break;
1636 }
1637 case 'k':
1638 if (find_section) warn("You prob don't want to specify -k twice");
1639 find_section = optarg;
1640 break;
1641 case 's': {
1642 if (find_sym) warn("You prob don't want to specify -s twice");
1643 find_sym = optarg;
1644 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1645 sprintf(versioned_symname, "%s@", find_sym);
1646 break;
1647 }
1648 case 'N': {
1649 if (find_lib) warn("You prob don't want to specify -N twice");
1650 find_lib = optarg;
1651 break;
1652 }
1653
1654 case 'F': {
1655 if (out_format) warn("You prob don't want to specify -F twice");
1656 out_format = optarg;
1657 break;
1658 }
1659 case 'z': {
1660 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1661 size_t x;
1662
1663 for (x = 0 ; x < strlen(optarg); x++) {
1664 switch(optarg[x]) {
1665 case 'p':
1666 case 'P':
1667 do_state(optarg[x], PAGEEXEC);
1668 break;
1669 case 's':
1670 case 'S':
1671 do_state(optarg[x], SEGMEXEC);
1672 break;
1673 case 'm':
1674 case 'M':
1675 do_state(optarg[x], MPROTECT);
1676 break;
1677 case 'e':
1678 case 'E':
1679 do_state(optarg[x], EMUTRAMP);
1680 break;
1681 case 'r':
1682 case 'R':
1683 do_state(optarg[x], RANDMMAP);
1684 break;
1685 case 'x':
1686 case 'X':
1687 do_state(optarg[x], RANDEXEC);
1688 break;
1689 default:
1690 break;
1691 }
1692 }
1693 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
1694 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
1695 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
1696 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
1697 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1698 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1699 setpax = flags;
1700 break;
1701 }
1702 case 'g': gmatch = 1; break;
1703 case 'L': use_ldcache = 1; break;
1704 case 'y': scan_symlink = 0; break;
1705 case 'A': scan_archives = 1; break;
1706 case 'B': show_banner = 0; break;
1707 case 'l': scan_ldpath = 1; break;
1708 case 'p': scan_envpath = 1; break;
1709 case 'R': dir_recurse = 1; break;
1710 case 'm': dir_crossmount = 0; break;
1711 case 'X': ++fix_elf; break;
1712 case 'x': show_pax = 1; break;
1713 case 'e': show_phdr = 1; break;
1714 case 't': show_textrel = 1; break;
1715 case 'r': show_rpath = 1; break;
1716 case 'n': show_needed = 1; break;
1717 case 'i': show_interp = 1; break;
1718 case 'b': show_bind = 1; break;
1719 case 'S': show_soname = 1; break;
1720 case 'T': show_textrels = 1; break;
1721 case 'q': be_quiet = 1; break;
1722 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1723 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
1724
1725 case ':':
1726 err("Option '%c' is missing parameter", optopt);
1727 case '?':
1728 err("Unknown option '%c' or argument missing", optopt);
1729 default:
1730 err("Unhandled option '%c'; please report this", i);
1731 }
1732 }
1733
1734 /* let the format option override all other options */
1735 if (out_format) {
1736 show_pax = show_phdr = show_textrel = show_rpath = \
1737 show_needed = show_interp = show_bind = show_soname = \
1738 show_textrels = 0;
1739 for (i = 0; out_format[i]; ++i) {
1740 if (!IS_MODIFIER(out_format[i])) continue;
1741
1742 switch (out_format[++i]) {
1743 case '+': break;
1744 case '%': break;
1745 case '#': break;
1746 case 'F': break;
1747 case 'p': break;
1748 case 'f': break;
1749 case 'k': break;
1750 case 's': break;
1751 case 'N': break;
1752 case 'o': break;
1753 case 'x': show_pax = 1; break;
1754 case 'e': show_phdr = 1; break;
1755 case 't': show_textrel = 1; break;
1756 case 'r': show_rpath = 1; break;
1757 case 'n': show_needed = 1; break;
1758 case 'i': show_interp = 1; break;
1759 case 'b': show_bind = 1; break;
1760 case 'S': show_soname = 1; break;
1761 case 'T': show_textrels = 1; break;
1762 default:
1763 err("Invalid format specifier '%c' (byte %i)",
1764 out_format[i], i+1);
1765 }
1766 }
1767
1768 /* construct our default format */
1769 } else {
1770 size_t fmt_len = 30;
1771 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
1772 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1773 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1774 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1775 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1776 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1777 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1778 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1779 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1780 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1781 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1782 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1783 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1784 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1785 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1786 }
1787 if (be_verbose > 2) printf("Format: %s\n", out_format);
1788
1789 /* now lets actually do the scanning */
1790 if (scan_ldpath || use_ldcache)
1791 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
1792 if (scan_ldpath) scanelf_ldpath();
1793 if (scan_envpath) scanelf_envpath();
1794 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
1795 from_file = "-";
1796 if (from_file) {
1797 scanelf_from_file(from_file);
1798 from_file = *argv;
1799 }
1800 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1801 err("Nothing to scan !?");
1802 while (optind < argc) {
1803 search_path = argv[optind++];
1804 scanelf_dir(search_path);
1805 }
1806
1807 /* clean up */
1808 free(versioned_symname);
1809 for (i = 0; ldpaths[i]; ++i)
1810 free(ldpaths[i]);
1811
1812 if (ldcache != 0)
1813 munmap(ldcache, ldcache_size);
1814 }
1815
1816 static char **get_split_env(const char *envvar)
1817 {
1818 const char *delims = " \t\n";
1819 char **envvals = NULL;
1820 char *env, *s;
1821 int nentry;
1822
1823 if ((env = getenv(envvar)) == NULL)
1824 return NULL;
1825
1826 env = xstrdup(env);
1827 if (env == NULL)
1828 return NULL;
1829
1830 s = strtok(env, delims);
1831 if (s == NULL) {
1832 free(env);
1833 return NULL;
1834 }
1835
1836 nentry = 0;
1837 while (s != NULL) {
1838 ++nentry;
1839 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
1840 envvals[nentry-1] = s;
1841 s = strtok(NULL, delims);
1842 }
1843 envvals[nentry] = NULL;
1844
1845 /* don't want to free(env) as it contains the memory that backs
1846 * the envvals array of strings */
1847 return envvals;
1848 }
1849 static void parseenv()
1850 {
1851 qa_textrels = get_split_env("QA_TEXTRELS");
1852 qa_execstack = get_split_env("QA_EXECSTACK");
1853 qa_wx_load = get_split_env("QA_WX_LOAD");
1854 }
1855 #ifdef __PAX_UTILS_CLEANUP
1856 static void cleanup()
1857 {
1858 free(out_format);
1859 free(qa_textrels);
1860 free(qa_execstack);
1861 free(qa_wx_load);
1862 }
1863 #endif
1864
1865
1866
1867 int main(int argc, char *argv[])
1868 {
1869 if (argc < 2)
1870 usage(EXIT_FAILURE);
1871 parseenv();
1872 parseargs(argc, argv);
1873 fclose(stdout);
1874 #ifdef __PAX_UTILS_CLEANUP
1875 cleanup();
1876 warn("The calls to add/delete heap should be off:\n"
1877 "\t- 1 due to the out_buffer not being freed in scanelf_file()\n"
1878 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
1879 #endif
1880 return EXIT_SUCCESS;
1881 }
1882
1883
1884
1885 /* utility funcs */
1886 static char *xstrdup(const char *s)
1887 {
1888 char *ret = strdup(s);
1889 if (!ret) err("Could not strdup(): %s", strerror(errno));
1890 return ret;
1891 }
1892 static void *xmalloc(size_t size)
1893 {
1894 void *ret = malloc(size);
1895 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1896 return ret;
1897 }
1898 static void *xrealloc(void *ptr, size_t size)
1899 {
1900 void *ret = realloc(ptr, size);
1901 if (!ret) err("Could not realloc() %li bytes", (unsigned long)size);
1902 return ret;
1903 }
1904 static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
1905 {
1906 size_t new_len;
1907
1908 new_len = strlen(*dst) + strlen(src);
1909 if (*curr_len <= new_len) {
1910 *curr_len = new_len + (*curr_len / 2);
1911 *dst = realloc(*dst, *curr_len);
1912 if (!*dst)
1913 err("could not realloc() %li bytes", (unsigned long)*curr_len);
1914 }
1915
1916 if (n)
1917 strncat(*dst, src, n);
1918 else
1919 strcat(*dst, src);
1920 }
1921 static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1922 {
1923 static char my_app[2];
1924 my_app[0] = append;
1925 my_app[1] = '\0';
1926 xstrcat(dst, my_app, curr_len);
1927 }
1928
1929 /* Match filename against entries in matchlist, return TRUE
1930 * if the file is listed */
1931 static int file_matches_list(const char *filename, char **matchlist)
1932 {
1933 char **file;
1934 char *match;
1935 char buf[__PAX_UTILS_PATH_MAX];
1936
1937 if (matchlist == NULL)
1938 return 0;
1939
1940 for (file = matchlist; *file != NULL; file++) {
1941 if (search_path) {
1942 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
1943 match = buf;
1944 } else {
1945 match = *file;
1946 }
1947 if (fnmatch(match, filename, 0) == 0)
1948 return 1;
1949 }
1950 return 0;
1951 }

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