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Revision 1.146 - (show annotations) (download) (as text)
Sun May 14 21:04:25 2006 UTC (7 years, 11 months ago) by vapier
Branch: MAIN
Changes since 1.145: +3 -5 lines
File MIME type: text/x-csrc
SET_STDOUT isnt needed

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 1.145 2006/05/14 19:08:56 kevquinn 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 #if defined(__GLIBC__) || defined(__UCLIBC__)
12 #include <glob.h>
13 #endif
14 #if defined(__FreeBSD__) || defined(__DragonFly__)
15 #include <elf-hints.h>
16 #endif
17
18 static const char *rcsid = "$Id: scanelf.c,v 1.145 2006/05/14 19:08:56 kevquinn Exp $";
19 #define argv0 "scanelf"
20
21 #define IS_MODIFIER(c) (c == '%' || c == '#' || c == '+')
22
23 #define do_state(option, flag) \
24 if (islower(option)) { \
25 flags &= ~PF_##flag; \
26 flags |= PF_NO##flag; \
27 } else { \
28 flags &= ~PF_NO##flag; \
29 flags |= PF_##flag; \
30 }
31
32
33 /* prototypes */
34 static int file_matches_list(const char *filename, char **matchlist);
35 static int scanelf_elfobj(elfobj *elf);
36 static int scanelf_elf(const char *filename, int fd, size_t len);
37 static int scanelf_archive(const char *filename, int fd, size_t len);
38 static void scanelf_file(const char *filename);
39 static void scanelf_dir(const char *path);
40 static void scanelf_ldpath(void);
41 static void scanelf_envpath(void);
42 static void usage(int status);
43 static char **get_split_env(const char *envvar);
44 static void parseenv(void);
45 static void parseargs(int argc, char *argv[]);
46 static char *xstrdup(const char *s);
47 static void *xmalloc(size_t size);
48 static void *xrealloc(void *ptr, size_t size);
49 static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n);
50 #define xstrcat(dst,src,curr_len) xstrncat(dst,src,curr_len,0)
51 static inline void xchrcat(char **dst, const char append, size_t *curr_len);
52
53 /* variables to control behavior */
54 static char match_etypes[126] = "";
55 static char *ldpaths[256];
56 static char scan_ldpath = 0;
57 static char scan_envpath = 0;
58 static char scan_symlink = 1;
59 static char scan_archives = 0;
60 static char dir_recurse = 0;
61 static char dir_crossmount = 1;
62 static char show_pax = 0;
63 static char show_phdr = 0;
64 static char show_textrel = 0;
65 static char show_rpath = 0;
66 static char show_needed = 0;
67 static char show_interp = 0;
68 static char show_bind = 0;
69 static char show_soname = 0;
70 static char show_textrels = 0;
71 static char show_banner = 1;
72 static char be_quiet = 0;
73 static char be_verbose = 0;
74 static char be_wewy_wewy_quiet = 0;
75 static char be_semi_verbose = 0;
76 static char *find_sym = NULL, *versioned_symname = NULL;
77 static char *find_lib = NULL;
78 static char *find_section = NULL;
79 static char *out_format = NULL;
80 static char *search_path = NULL;
81 static char fix_elf = 0;
82 static char gmatch = 0;
83 static char use_ldcache = 0;
84
85 static char **qa_textrels = NULL;
86 static char **qa_execstack = NULL;
87 static char **qa_wx_load = NULL;
88
89 int match_bits = 0;
90 caddr_t ldcache = 0;
91 size_t ldcache_size = 0;
92 unsigned long setpax = 0UL;
93
94 /* utility funcs */
95 static char *xstrdup(const char *s)
96 {
97 char *ret = strdup(s);
98 if (!ret) err("Could not strdup(): %s", strerror(errno));
99 return ret;
100 }
101 static void *xmalloc(size_t size)
102 {
103 void *ret = malloc(size);
104 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
105 return ret;
106 }
107 static void *xrealloc(void *ptr, size_t size)
108 {
109 void *ret = realloc(ptr, size);
110 if (!ret) err("Could not realloc() %li bytes", (unsigned long)size);
111 return ret;
112 }
113 static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
114 {
115 size_t new_len;
116
117 new_len = strlen(*dst) + strlen(src);
118 if (*curr_len <= new_len) {
119 *curr_len = new_len + (*curr_len / 2);
120 *dst = realloc(*dst, *curr_len);
121 if (!*dst)
122 err("could not realloc() %li bytes", (unsigned long)*curr_len);
123 }
124
125 if (n)
126 strncat(*dst, src, n);
127 else
128 strcat(*dst, src);
129 }
130 static inline void xchrcat(char **dst, const char append, size_t *curr_len)
131 {
132 static char my_app[2];
133 my_app[0] = append;
134 my_app[1] = '\0';
135 xstrcat(dst, my_app, curr_len);
136 }
137
138 /* Match filename against entries in matchlist, return TRUE
139 * if the file is listed */
140 static int file_matches_list(const char *filename, char **matchlist) {
141 char **file;
142 char *match;
143 char buf[__PAX_UTILS_PATH_MAX];
144
145 if (matchlist == NULL)
146 return 0;
147
148 for (file = matchlist; *file != NULL; file++) {
149 if (search_path) {
150 snprintf(buf,__PAX_UTILS_PATH_MAX, "%s%s", search_path, *file);
151 match=buf;
152 } else {
153 match=*file;
154 }
155 if (fnmatch(match, filename, 0) == 0)
156 return 1; /* TRUE */
157 }
158 return 0; /* FALSE */
159 }
160
161 /* sub-funcs for scanelf_file() */
162 static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
163 {
164 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
165 #define GET_SYMTABS(B) \
166 if (elf->elf_class == ELFCLASS ## B) { \
167 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
168 /* debug sections */ \
169 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
170 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
171 /* runtime sections */ \
172 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
173 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
174 if (symtab && dynsym) { \
175 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \
176 } else { \
177 *sym = (void*)(symtab ? symtab : dynsym); \
178 } \
179 if (strtab && dynstr) { \
180 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \
181 } else { \
182 *tab = (void*)(strtab ? strtab : dynstr); \
183 } \
184 }
185 GET_SYMTABS(32)
186 GET_SYMTABS(64)
187 }
188
189 static char *scanelf_file_pax(elfobj *elf, char *found_pax)
190 {
191 static char ret[7];
192 unsigned long i, shown;
193
194 if (!show_pax) return NULL;
195
196 shown = 0;
197 memset(&ret, 0, sizeof(ret));
198
199 if (elf->phdr) {
200 #define SHOW_PAX(B) \
201 if (elf->elf_class == ELFCLASS ## B) { \
202 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
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_PAX_FLAGS) \
206 continue; \
207 if (fix_elf && setpax) { \
208 /* set the paxctl flags */ \
209 ESET(phdr[i].p_flags, setpax); \
210 } \
211 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
212 continue; \
213 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
214 *found_pax = 1; \
215 ++shown; \
216 break; \
217 } \
218 }
219 SHOW_PAX(32)
220 SHOW_PAX(64)
221 }
222
223
224 if (fix_elf && setpax) {
225 /* set the chpax settings */
226 if (elf->elf_class == ELFCLASS32) {
227 if (EHDR32(elf->ehdr)->e_type == ET_DYN || EHDR32(elf->ehdr)->e_type == ET_EXEC)
228 ESET(EHDR32(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
229 } else {
230 if (EHDR64(elf->ehdr)->e_type == ET_DYN || EHDR64(elf->ehdr)->e_type == ET_EXEC)
231 ESET(EHDR64(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
232 }
233 }
234
235 /* fall back to EI_PAX if no PT_PAX was found */
236 if (!*ret) {
237 static char *paxflags;
238 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
239 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
240 *found_pax = 1;
241 return (be_wewy_wewy_quiet ? NULL : paxflags);
242 }
243 strncpy(ret, paxflags, sizeof(ret));
244 }
245
246 if (be_wewy_wewy_quiet || (be_quiet && !shown))
247 return NULL;
248 else
249 return ret;
250 }
251
252 static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
253 {
254 static char ret[12];
255 char *found;
256 unsigned long i, shown, multi_stack, multi_relro, multi_load;
257 int max_pt_load;
258
259 if (!show_phdr) return NULL;
260
261 memcpy(ret, "--- --- ---\0", 12);
262
263 shown = 0;
264 multi_stack = multi_relro = multi_load = 0;
265 max_pt_load = elf_max_pt_load(elf);
266
267 #define NOTE_GNU_STACK ".note.GNU-stack"
268 #define SHOW_PHDR(B) \
269 if (elf->elf_class == ELFCLASS ## B) { \
270 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
271 Elf ## B ## _Off offset; \
272 uint32_t flags, check_flags; \
273 if (elf->phdr != NULL) { \
274 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
275 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
276 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
277 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
278 if (!file_matches_list(elf->filename, qa_execstack)) {\
279 found = found_phdr; \
280 offset = 0; \
281 check_flags = PF_X; \
282 } else continue; \
283 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
284 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
285 found = found_relro; \
286 offset = 4; \
287 check_flags = PF_X; \
288 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
289 if (ehdr->e_type == ET_DYN || ehdr->e_type == ET_EXEC) \
290 if (multi_load++ > max_pt_load) warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
291 if (!file_matches_list(elf->filename, qa_wx_load)) {\
292 found = found_load; \
293 offset = 8; \
294 check_flags = PF_W|PF_X; \
295 } else continue; \
296 } else \
297 continue; \
298 flags = EGET(phdr[i].p_flags); \
299 if (be_quiet && ((flags & check_flags) != check_flags)) \
300 continue; \
301 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
302 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
303 ret[3] = ret[7] = '!'; \
304 flags = EGET(phdr[i].p_flags); \
305 } \
306 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
307 *found = 1; \
308 ++shown; \
309 } \
310 } else if (elf->shdr != NULL) { \
311 /* no program headers which means this is prob an object file */ \
312 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
313 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
314 char *str; \
315 if ((void*)strtbl > (void*)elf->data_end) \
316 goto skip_this_shdr##B; \
317 check_flags = SHF_WRITE|SHF_EXECINSTR; \
318 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
319 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
320 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
321 str = elf->data + offset; \
322 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
323 if (!strcmp(str, NOTE_GNU_STACK)) { \
324 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
325 flags = EGET(shdr[i].sh_flags); \
326 if (be_quiet && ((flags & check_flags) != check_flags)) \
327 continue; \
328 ++*found_phdr; \
329 shown = 1; \
330 if (flags & SHF_WRITE) ret[0] = 'W'; \
331 if (flags & SHF_ALLOC) ret[1] = 'A'; \
332 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
333 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
334 break; \
335 } \
336 } \
337 skip_this_shdr##B: \
338 if (!multi_stack) { \
339 *found_phdr = 1; \
340 shown = 1; \
341 memcpy(ret, "!WX", 3); \
342 } \
343 } \
344 }
345 SHOW_PHDR(32)
346 SHOW_PHDR(64)
347
348 if (be_wewy_wewy_quiet || (be_quiet && !shown))
349 return NULL;
350 else
351 return ret;
352 }
353
354 static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
355 {
356 static const char *ret = "TEXTREL";
357 unsigned long i;
358
359 if (!show_textrel && !show_textrels) return NULL;
360
361 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
362
363 if (elf->phdr) {
364 #define SHOW_TEXTREL(B) \
365 if (elf->elf_class == ELFCLASS ## B) { \
366 Elf ## B ## _Dyn *dyn; \
367 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
368 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
369 Elf ## B ## _Off offset; \
370 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
371 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
372 offset = EGET(phdr[i].p_offset); \
373 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
374 dyn = DYN ## B (elf->data + offset); \
375 while (EGET(dyn->d_tag) != DT_NULL) { \
376 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
377 *found_textrel = 1; \
378 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
379 return (be_wewy_wewy_quiet ? NULL : ret); \
380 } \
381 ++dyn; \
382 } \
383 } }
384 SHOW_TEXTREL(32)
385 SHOW_TEXTREL(64)
386 }
387
388 if (be_quiet || be_wewy_wewy_quiet)
389 return NULL;
390 else
391 return " - ";
392 }
393 static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
394 {
395 unsigned long s, r, rmax;
396 void *symtab_void, *strtab_void, *text_void;
397
398 if (!show_textrels) return NULL;
399
400 /* don't search for TEXTREL's if the ELF doesn't have any */
401 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
402 if (!*found_textrel) return NULL;
403
404 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
405 text_void = elf_findsecbyname(elf, ".text");
406
407 if (symtab_void && strtab_void && text_void && elf->shdr) {
408 #define SHOW_TEXTRELS(B) \
409 if (elf->elf_class == ELFCLASS ## B) { \
410 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
411 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
412 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
413 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
414 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
415 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
416 uint ## B ## _t memsz = EGET(text->sh_size); \
417 Elf ## B ## _Rel *rel; \
418 Elf ## B ## _Rela *rela; \
419 /* search the section headers for relocations */ \
420 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
421 uint32_t sh_type = EGET(shdr[s].sh_type); \
422 if (sh_type == SHT_REL) { \
423 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \
424 rela = NULL; \
425 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
426 } else if (sh_type == SHT_RELA) { \
427 rel = NULL; \
428 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \
429 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
430 } else \
431 continue; \
432 /* now see if any of the relocs are in the .text */ \
433 for (r = 0; r < rmax; ++r) { \
434 unsigned long sym_max; \
435 Elf ## B ## _Addr offset_tmp; \
436 Elf ## B ## _Sym *func; \
437 Elf ## B ## _Sym *sym; \
438 Elf ## B ## _Addr r_offset; \
439 uint ## B ## _t r_info; \
440 if (sh_type == SHT_REL) { \
441 r_offset = EGET(rel[r].r_offset); \
442 r_info = EGET(rel[r].r_info); \
443 } else { \
444 r_offset = EGET(rela[r].r_offset); \
445 r_info = EGET(rela[r].r_info); \
446 } \
447 /* make sure this relocation is inside of the .text */ \
448 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
449 if (be_verbose <= 2) continue; \
450 } else \
451 *found_textrels = 1; \
452 /* locate this relocation symbol name */ \
453 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
454 if ((void*)sym > (void*)elf->data_end) { \
455 warn("%s: corrupt ELF symbol", elf->filename); \
456 continue; \
457 } \
458 sym_max = ELF ## B ## _R_SYM(r_info); \
459 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
460 sym += sym_max; \
461 else \
462 sym = NULL; \
463 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
464 /* show the raw details about this reloc */ \
465 printf(" %s: ", elf->base_filename); \
466 if (sym && sym->st_name) \
467 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \
468 else \
469 printf("(memory/fake?)"); \
470 printf(" [0x%lX]", (unsigned long)r_offset); \
471 /* now try to find the closest symbol that this rel is probably in */ \
472 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
473 func = NULL; \
474 offset_tmp = 0; \
475 while (sym_max--) { \
476 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
477 func = sym; \
478 offset_tmp = EGET(sym->st_value); \
479 } \
480 ++sym; \
481 } \
482 printf(" in "); \
483 if (func && func->st_name) \
484 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \
485 else \
486 printf("(NULL: fake?)"); \
487 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
488 } \
489 } }
490 SHOW_TEXTRELS(32)
491 SHOW_TEXTRELS(64)
492 }
493 if (!*found_textrels)
494 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
495
496 return NULL;
497 }
498
499 static void rpath_security_checks(elfobj *, char *, const char *);
500 static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
501 {
502 struct stat st;
503 switch (*item) {
504 case '/': break;
505 case '.':
506 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
507 break;
508 case ':':
509 case '\0':
510 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
511 break;
512 case '$':
513 if (fstat(elf->fd, &st) != -1)
514 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
515 warnf("Security problem with %s='%s' in %s with mode set of %o",
516 dt_type, item, elf->filename, st.st_mode & 07777);
517 break;
518 default:
519 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
520 break;
521 }
522 }
523 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
524 {
525 unsigned long i, s;
526 char *rpath, *runpath, **r;
527 void *strtbl_void;
528
529 if (!show_rpath) return;
530
531 strtbl_void = elf_findsecbyname(elf, ".dynstr");
532 rpath = runpath = NULL;
533
534 if (elf->phdr && strtbl_void) {
535 #define SHOW_RPATH(B) \
536 if (elf->elf_class == ELFCLASS ## B) { \
537 Elf ## B ## _Dyn *dyn; \
538 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
539 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
540 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
541 Elf ## B ## _Off offset; \
542 Elf ## B ## _Xword word; \
543 /* Scan all the program headers */ \
544 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
545 /* Just scan dynamic headers */ \
546 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
547 offset = EGET(phdr[i].p_offset); \
548 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
549 /* Just scan dynamic RPATH/RUNPATH headers */ \
550 dyn = DYN ## B (elf->data + offset); \
551 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
552 if (word == DT_RPATH) { \
553 r = &rpath; \
554 } else if (word == DT_RUNPATH) { \
555 r = &runpath; \
556 } else { \
557 ++dyn; \
558 continue; \
559 } \
560 /* Verify the memory is somewhat sane */ \
561 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
562 if (offset < (Elf ## B ## _Off)elf->len) { \
563 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
564 *r = (char*)(elf->data + offset); \
565 /* cache the length in case we need to nuke this section later on */ \
566 if (fix_elf) \
567 offset = strlen(*r); \
568 /* If quiet, don't output paths in ld.so.conf */ \
569 if (be_quiet) { \
570 size_t len; \
571 char *start, *end; \
572 /* note that we only 'chop' off leading known paths. */ \
573 /* since *r is read-only memory, we can only move the ptr forward. */ \
574 start = *r; \
575 /* scan each path in : delimited list */ \
576 while (start) { \
577 rpath_security_checks(elf, start, get_elfdtype(word)); \
578 end = strchr(start, ':'); \
579 len = (end ? abs(end - start) : strlen(start)); \
580 if (use_ldcache) \
581 for (s = 0; ldpaths[s]; ++s) \
582 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
583 *r = end; \
584 /* corner case ... if RPATH reads "/usr/lib:", we want \
585 * to show ':' rather than '' */ \
586 if (end && end[1] != '\0') \
587 (*r)++; \
588 break; \
589 } \
590 if (!*r || !end) \
591 break; \
592 else \
593 start = start + len + 1; \
594 } \
595 } \
596 if (*r) { \
597 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
598 /* just nuke it */ \
599 nuke_it##B: \
600 memset(*r, 0x00, offset); \
601 *r = NULL; \
602 ESET(dyn->d_tag, DT_DEBUG); \
603 ESET(dyn->d_un.d_ptr, 0); \
604 } else if (fix_elf) { \
605 /* try to clean "bad" paths */ \
606 size_t len, tmpdir_len; \
607 char *start, *end; \
608 const char *tmpdir; \
609 start = *r; \
610 tmpdir = (getenv("TMPDIR") ? : "."); \
611 tmpdir_len = strlen(tmpdir); \
612 while (1) { \
613 end = strchr(start, ':'); \
614 if (start == end) { \
615 eat_this_path##B: \
616 len = strlen(end); \
617 memmove(start, end+1, len); \
618 start[len-1] = '\0'; \
619 end = start - 1; \
620 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
621 if (!end) { \
622 if (start == *r) \
623 goto nuke_it##B; \
624 *--start = '\0'; \
625 } else \
626 goto eat_this_path##B; \
627 } \
628 if (!end) \
629 break; \
630 start = end + 1; \
631 } \
632 if (**r == '\0') \
633 goto nuke_it##B; \
634 } \
635 if (*r) \
636 *found_rpath = 1; \
637 } \
638 } \
639 ++dyn; \
640 } \
641 } }
642 SHOW_RPATH(32)
643 SHOW_RPATH(64)
644 }
645
646 if (be_wewy_wewy_quiet) return;
647
648 if (rpath && runpath) {
649 if (!strcmp(rpath, runpath)) {
650 xstrcat(ret, runpath, ret_len);
651 } else {
652 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
653 xchrcat(ret, '{', ret_len);
654 xstrcat(ret, rpath, ret_len);
655 xchrcat(ret, ',', ret_len);
656 xstrcat(ret, runpath, ret_len);
657 xchrcat(ret, '}', ret_len);
658 }
659 } else if (rpath || runpath)
660 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
661 else if (!be_quiet)
662 xstrcat(ret, " - ", ret_len);
663 }
664
665 #define LDSO_CACHE_MAGIC "ld.so-"
666 #define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
667 #define LDSO_CACHE_VER "1.7.0"
668 #define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
669 #define FLAG_ANY -1
670 #define FLAG_TYPE_MASK 0x00ff
671 #define FLAG_LIBC4 0x0000
672 #define FLAG_ELF 0x0001
673 #define FLAG_ELF_LIBC5 0x0002
674 #define FLAG_ELF_LIBC6 0x0003
675 #define FLAG_REQUIRED_MASK 0xff00
676 #define FLAG_SPARC_LIB64 0x0100
677 #define FLAG_IA64_LIB64 0x0200
678 #define FLAG_X8664_LIB64 0x0300
679 #define FLAG_S390_LIB64 0x0400
680 #define FLAG_POWERPC_LIB64 0x0500
681 #define FLAG_MIPS64_LIBN32 0x0600
682 #define FLAG_MIPS64_LIBN64 0x0700
683
684 static char *lookup_cache_lib(elfobj *, char *);
685 #if defined(__GLIBC__) || defined(__UCLIBC__)
686 static char *lookup_cache_lib(elfobj *elf, char *fname)
687 {
688 int fd = 0;
689 char *strs;
690 static char buf[__PAX_UTILS_PATH_MAX] = "";
691 const char *cachefile = "/etc/ld.so.cache";
692 struct stat st;
693
694 typedef struct {
695 char magic[LDSO_CACHE_MAGIC_LEN];
696 char version[LDSO_CACHE_VER_LEN];
697 int nlibs;
698 } header_t;
699 header_t *header;
700
701 typedef struct {
702 int flags;
703 int sooffset;
704 int liboffset;
705 } libentry_t;
706 libentry_t *libent;
707
708 if (fname == NULL)
709 return NULL;
710
711 if (ldcache == 0) {
712 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1)
713 return NULL;
714
715 /* cache these values so we only map/unmap the cache file once */
716 ldcache_size = st.st_size;
717 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
718
719 close(fd);
720
721 if (ldcache == (caddr_t)-1) {
722 ldcache = 0;
723 return NULL;
724 }
725
726 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
727 return NULL;
728 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
729 return NULL;
730 }
731
732 header = (header_t *) ldcache;
733 libent = (libentry_t *) (ldcache + sizeof(header_t));
734 strs = (char *) &libent[header->nlibs];
735
736 for (fd = 0; fd < header->nlibs; fd++) {
737 /* this should be more fine grained, but for now we assume that
738 * diff arches will not be cached together. and we ignore the
739 * the different multilib mips cases. */
740 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
741 continue;
742 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
743 continue;
744
745 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
746 continue;
747 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
748 }
749 return buf;
750 }
751 #else
752 #warning Cache support not implemented for your current target.
753 static char *lookup_cache_lib(elfobj *elf, char *fname)
754 {
755 return NULL;
756 }
757 #endif
758
759 static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
760 {
761 unsigned long i;
762 char *needed;
763 void *strtbl_void;
764 char *p;
765
766 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
767
768 strtbl_void = elf_findsecbyname(elf, ".dynstr");
769
770 if (elf->phdr && strtbl_void) {
771 #define SHOW_NEEDED(B) \
772 if (elf->elf_class == ELFCLASS ## B) { \
773 Elf ## B ## _Dyn *dyn; \
774 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
775 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
776 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
777 Elf ## B ## _Off offset; \
778 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
779 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
780 offset = EGET(phdr[i].p_offset); \
781 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
782 dyn = DYN ## B (elf->data + offset); \
783 while (EGET(dyn->d_tag) != DT_NULL) { \
784 if (EGET(dyn->d_tag) == DT_NEEDED) { \
785 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
786 if (offset >= (Elf ## B ## _Off)elf->len) { \
787 ++dyn; \
788 continue; \
789 } \
790 needed = (char*)(elf->data + offset); \
791 if (op == 0) { \
792 if (!be_wewy_wewy_quiet) { \
793 if (*found_needed) xchrcat(ret, ',', ret_len); \
794 if (use_ldcache) \
795 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
796 needed = p; \
797 xstrcat(ret, needed, ret_len); \
798 } \
799 *found_needed = 1; \
800 } else { \
801 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \
802 *found_lib = 1; \
803 return (be_wewy_wewy_quiet ? NULL : needed); \
804 } \
805 } \
806 } \
807 ++dyn; \
808 } \
809 } }
810 SHOW_NEEDED(32)
811 SHOW_NEEDED(64)
812 if (op == 0 && !*found_needed && be_verbose)
813 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
814 }
815
816 return NULL;
817 }
818 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
819 {
820 void *strtbl_void;
821
822 if (!show_interp) return NULL;
823
824 strtbl_void = elf_findsecbyname(elf, ".interp");
825
826 if (strtbl_void) {
827 #define SHOW_INTERP(B) \
828 if (elf->elf_class == ELFCLASS ## B) { \
829 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
830 *found_interp = 1; \
831 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
832 }
833 SHOW_INTERP(32)
834 SHOW_INTERP(64)
835 }
836 return NULL;
837 }
838 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
839 {
840 unsigned long i;
841 struct stat s;
842 char dynamic = 0;
843
844 if (!show_bind) return NULL;
845 if (!elf->phdr) return NULL;
846
847 #define SHOW_BIND(B) \
848 if (elf->elf_class == ELFCLASS ## B) { \
849 Elf ## B ## _Dyn *dyn; \
850 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
851 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
852 Elf ## B ## _Off offset; \
853 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
854 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
855 dynamic = 1; \
856 offset = EGET(phdr[i].p_offset); \
857 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
858 dyn = DYN ## B (elf->data + offset); \
859 while (EGET(dyn->d_tag) != DT_NULL) { \
860 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
861 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
862 { \
863 if (be_quiet) return NULL; \
864 *found_bind = 1; \
865 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
866 } \
867 ++dyn; \
868 } \
869 } \
870 }
871 SHOW_BIND(32)
872 SHOW_BIND(64)
873
874 if (be_wewy_wewy_quiet) return NULL;
875
876 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) {
877 return NULL;
878 } else {
879 *found_bind = 1;
880 return (char *) (dynamic ? "LAZY" : "STATIC");
881 }
882 }
883 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
884 {
885 unsigned long i;
886 char *soname;
887 void *strtbl_void;
888
889 if (!show_soname) return NULL;
890
891 strtbl_void = elf_findsecbyname(elf, ".dynstr");
892
893 if (elf->phdr && strtbl_void) {
894 #define SHOW_SONAME(B) \
895 if (elf->elf_class == ELFCLASS ## B) { \
896 Elf ## B ## _Dyn *dyn; \
897 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
898 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
899 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
900 Elf ## B ## _Off offset; \
901 /* only look for soname in shared objects */ \
902 if (ehdr->e_type != ET_DYN) \
903 return NULL; \
904 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
905 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
906 offset = EGET(phdr[i].p_offset); \
907 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
908 dyn = DYN ## B (elf->data + offset); \
909 while (EGET(dyn->d_tag) != DT_NULL) { \
910 if (EGET(dyn->d_tag) == DT_SONAME) { \
911 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
912 if (offset >= (Elf ## B ## _Off)elf->len) { \
913 ++dyn; \
914 continue; \
915 } \
916 soname = (char*)(elf->data + offset); \
917 *found_soname = 1; \
918 return (be_wewy_wewy_quiet ? NULL : soname); \
919 } \
920 ++dyn; \
921 } \
922 } }
923 SHOW_SONAME(32)
924 SHOW_SONAME(64)
925 }
926
927 return NULL;
928 }
929 static char *scanelf_file_sym(elfobj *elf, char *found_sym)
930 {
931 unsigned long i;
932 char *ret;
933 void *symtab_void, *strtab_void;
934
935 if (!find_sym) return NULL;
936 ret = find_sym;
937
938 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
939
940 if (symtab_void && strtab_void) {
941 #define FIND_SYM(B) \
942 if (elf->elf_class == ELFCLASS ## B) { \
943 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
944 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
945 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
946 unsigned long cnt = EGET(symtab->sh_entsize); \
947 char *symname; \
948 if (cnt) \
949 cnt = EGET(symtab->sh_size) / cnt; \
950 for (i = 0; i < cnt; ++i) { \
951 if (sym->st_name) { \
952 /* make sure the symbol name is in acceptable memory range */ \
953 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
954 if ((void*)symname > (void*)elf->data_end) { \
955 warnf("%s: corrupt ELF symbols", elf->filename); \
956 ++sym; \
957 continue; \
958 } \
959 /* debug display ... show all symbols and some extra info */ \
960 if (*ret == '*') { \
961 printf("%s(%s) %5lX %15s %s\n", \
962 ((*found_sym == 0) ? "\n\t" : "\t"), \
963 elf->base_filename, \
964 (unsigned long)sym->st_size, \
965 get_elfstttype(sym->st_info), \
966 symname); \
967 *found_sym = 1; \
968 } else { \
969 /* allow the user to specify a comma delimited list of symbols to search for */ \
970 char *this_sym, *next_sym; \
971 this_sym = ret; \
972 do { \
973 next_sym = strchr(this_sym, ','); \
974 if (next_sym == NULL) \
975 next_sym = this_sym + strlen(this_sym); \
976 /* do we want a defined symbol ? */ \
977 if (*this_sym == '+') { \
978 if (sym->st_shndx == SHN_UNDEF) \
979 goto skip_this_sym##B; \
980 ++this_sym; \
981 /* do we want an undefined symbol ? */ \
982 } else if (*this_sym == '-') { \
983 if (sym->st_shndx != SHN_UNDEF) \
984 goto skip_this_sym##B; \
985 ++this_sym; \
986 } \
987 /* ok, lets compare the name now */ \
988 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
989 (strncmp(symname, versioned_symname, strlen(versioned_symname)) == 0)) { \
990 if (be_semi_verbose) { \
991 char buf[126]; \
992 snprintf(buf, sizeof(buf), "%lX %s %s", \
993 (unsigned long)sym->st_size, get_elfstttype(sym->st_info), this_sym); \
994 ret = buf; \
995 } else \
996 ret = this_sym; \
997 (*found_sym)++; \
998 goto break_out; \
999 } \
1000 skip_this_sym##B: this_sym = next_sym + 1; \
1001 } while (*next_sym != '\0'); \
1002 } \
1003 } \
1004 ++sym; \
1005 } }
1006 FIND_SYM(32)
1007 FIND_SYM(64)
1008 }
1009
1010 break_out:
1011 if (be_wewy_wewy_quiet) return NULL;
1012
1013 if (*find_sym != '*' && *found_sym)
1014 return ret;
1015 if (be_quiet)
1016 return NULL;
1017 else
1018 return (char *)" - ";
1019 }
1020
1021
1022 static char *scanelf_file_sections(elfobj *elf, char *found_section)
1023 {
1024 if (!find_section)
1025 return NULL;
1026
1027 #define FIND_SECTION(B) \
1028 if (elf->elf_class == ELFCLASS ## B) { \
1029 int invert; \
1030 Elf ## B ## _Shdr *section; \
1031 invert = (*find_section == '!' ? 1 : 0); \
1032 section = SHDR ## B (elf_findsecbyname(elf, find_section+invert)); \
1033 if ((section == NULL && invert) || (section != NULL && !invert)) \
1034 *found_section = 1; \
1035 }
1036 FIND_SECTION(32)
1037 FIND_SECTION(64)
1038
1039 if (be_wewy_wewy_quiet)
1040 return NULL;
1041
1042 if (*found_section)
1043 return find_section;
1044
1045 if (be_quiet)
1046 return NULL;
1047 else
1048 return (char *)" - ";
1049 }
1050
1051 /* scan an elf file and show all the fun stuff */
1052 #define prints(str) write(fileno(stdout), str, strlen(str))
1053 static int scanelf_elfobj(elfobj *elf)
1054 {
1055 unsigned long i;
1056 char found_pax, found_phdr, found_relro, found_load, found_textrel,
1057 found_rpath, found_needed, found_interp, found_bind, found_soname,
1058 found_sym, found_lib, found_file, found_textrels, found_section;
1059 static char *out_buffer = NULL;
1060 static size_t out_len;
1061
1062 found_pax = found_phdr = found_relro = found_load = found_textrel = \
1063 found_rpath = found_needed = found_interp = found_bind = found_soname = \
1064 found_sym = found_lib = found_file = found_textrels = found_section = 0;
1065
1066 if (be_verbose > 2)
1067 printf("%s: scanning file {%s,%s}\n", elf->filename,
1068 get_elfeitype(EI_CLASS, elf->elf_class),
1069 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
1070 else if (be_verbose > 1)
1071 printf("%s: scanning file\n", elf->filename);
1072
1073 /* init output buffer */
1074 if (!out_buffer) {
1075 out_len = sizeof(char) * 80;
1076 out_buffer = (char*)xmalloc(out_len);
1077 }
1078 *out_buffer = '\0';
1079
1080 /* show the header */
1081 if (!be_quiet && show_banner) {
1082 for (i = 0; out_format[i]; ++i) {
1083 if (!IS_MODIFIER(out_format[i])) continue;
1084
1085 switch (out_format[++i]) {
1086 case '+': break;
1087 case '%': break;
1088 case '#': break;
1089 case 'F':
1090 case 'p':
1091 case 'f': prints("FILE "); found_file = 1; break;
1092 case 'o': prints(" TYPE "); break;
1093 case 'x': prints(" PAX "); break;
1094 case 'e': prints("STK/REL/PTL "); break;
1095 case 't': prints("TEXTREL "); break;
1096 case 'r': prints("RPATH "); break;
1097 case 'n': prints("NEEDED "); break;
1098 case 'i': prints("INTERP "); break;
1099 case 'b': prints("BIND "); break;
1100 case 'S': prints("SONAME "); break;
1101 case 's': prints("SYM "); break;
1102 case 'N': prints("LIB "); break;
1103 case 'T': prints("TEXTRELS "); break;
1104 case 'k': prints("SECTION "); break;
1105 default: warnf("'%c' has no title ?", out_format[i]);
1106 }
1107 }
1108 if (!found_file) prints("FILE ");
1109 prints("\n");
1110 found_file = 0;
1111 show_banner = 0;
1112 }
1113
1114 /* dump all the good stuff */
1115 for (i = 0; out_format[i]; ++i) {
1116 const char *out;
1117 const char *tmp;
1118
1119 if (!IS_MODIFIER(out_format[i])) {
1120 xchrcat(&out_buffer, out_format[i], &out_len);
1121 continue;
1122 }
1123
1124 out = NULL;
1125 be_wewy_wewy_quiet = (out_format[i] == '#');
1126 be_semi_verbose = (out_format[i] == '+');
1127 switch (out_format[++i]) {
1128 case '+':
1129 case '%':
1130 case '#':
1131 xchrcat(&out_buffer, out_format[i], &out_len); break;
1132 case 'F':
1133 found_file = 1;
1134 if (be_wewy_wewy_quiet) break;
1135 xstrcat(&out_buffer, elf->filename, &out_len);
1136 break;
1137 case 'p':
1138 found_file = 1;
1139 if (be_wewy_wewy_quiet) break;
1140 tmp = elf->filename;
1141 if (search_path) {
1142 ssize_t len_search = strlen(search_path);
1143 ssize_t len_file = strlen(elf->filename);
1144 if (!strncmp(elf->filename, search_path, len_search) && \
1145 len_file > len_search)
1146 tmp += len_search;
1147 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1148 }
1149 xstrcat(&out_buffer, tmp, &out_len);
1150 break;
1151 case 'f':
1152 found_file = 1;
1153 if (be_wewy_wewy_quiet) break;
1154 tmp = strrchr(elf->filename, '/');
1155 tmp = (tmp == NULL ? elf->filename : tmp+1);
1156 xstrcat(&out_buffer, tmp, &out_len);
1157 break;
1158 case 'o': out = get_elfetype(elf); break;
1159 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
1160 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
1161 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1162 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
1163 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1164 case 'n':
1165 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
1166 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1167 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1168 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
1169 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1170 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1171 default: warnf("'%c' has no scan code?", out_format[i]);
1172 }
1173 if (out) {
1174 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
1175 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
1176 xstrncat(&out_buffer, out, &out_len, (tmp-out));
1177 else
1178 xstrcat(&out_buffer, out, &out_len);
1179 }
1180 }
1181
1182 #define FOUND_SOMETHING() \
1183 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1184 found_rpath || found_needed || found_interp || found_bind || \
1185 found_soname || found_sym || found_lib || found_textrels || found_section )
1186
1187 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1188 xchrcat(&out_buffer, ' ', &out_len);
1189 xstrcat(&out_buffer, elf->filename, &out_len);
1190 }
1191 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
1192 puts(out_buffer);
1193 fflush(stdout);
1194 }
1195
1196 return 0;
1197 }
1198
1199 /* scan a single elf */
1200 static int scanelf_elf(const char *filename, int fd, size_t len)
1201 {
1202 int ret = 1;
1203 elfobj *elf;
1204
1205 /* verify this is real ELF */
1206 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1207 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1208 return ret;
1209 }
1210 switch (match_bits) {
1211 case 32:
1212 if (elf->elf_class != ELFCLASS32)
1213 goto label_done;
1214 break;
1215 case 64:
1216 if (elf->elf_class != ELFCLASS64)
1217 goto label_done;
1218 break;
1219 default: break;
1220 }
1221 if (strlen(match_etypes)) {
1222 char sbuf[126];
1223 strncpy(sbuf, match_etypes, sizeof(sbuf));
1224 if (strchr(match_etypes, ',') != NULL) {
1225 char *p;
1226 while((p = strrchr(sbuf, ',')) != NULL) {
1227 *p = 0;
1228 if (etype_lookup(p+1) == get_etype(elf))
1229 goto label_ret;
1230 }
1231 }
1232 if (etype_lookup(sbuf) != get_etype(elf))
1233 goto label_done;
1234 }
1235
1236 label_ret:
1237 ret = scanelf_elfobj(elf);
1238
1239 label_done:
1240 unreadelf(elf);
1241 return ret;
1242 }
1243
1244 /* scan an archive of elfs */
1245 static int scanelf_archive(const char *filename, int fd, size_t len)
1246 {
1247 archive_handle *ar;
1248 archive_member *m;
1249 char *ar_buffer;
1250 elfobj *elf;
1251
1252 ar = ar_open_fd(filename, fd);
1253 if (ar == NULL)
1254 return 1;
1255
1256 ar_buffer = (char*)mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1257 while ((m=ar_next(ar)) != NULL) {
1258 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size);
1259 if (elf) {
1260 scanelf_elfobj(elf);
1261 unreadelf(elf);
1262 }
1263 }
1264 munmap(ar_buffer, len);
1265
1266 return 0;
1267 }
1268 /* scan a file which may be an elf or an archive or some other magical beast */
1269 static void scanelf_file(const char *filename)
1270 {
1271 struct stat st;
1272 int fd;
1273
1274 /* make sure 'filename' exists */
1275 if (lstat(filename, &st) == -1) {
1276 if (be_verbose > 2) printf("%s: does not exist\n", filename);
1277 return;
1278 }
1279
1280 /* always handle regular files and handle symlinked files if no -y */
1281 if (S_ISLNK(st.st_mode)) {
1282 if (!scan_symlink) return;
1283 stat(filename, &st);
1284 }
1285 if (!S_ISREG(st.st_mode)) {
1286 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1287 return;
1288 }
1289
1290 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1291 return;
1292
1293 if (scanelf_elf(filename, fd, st.st_size) == 1 && scan_archives)
1294 /* if it isn't an ELF, maybe it's an .a archive */
1295 scanelf_archive(filename, fd, st.st_size);
1296
1297 close(fd);
1298 }
1299
1300 /* scan a directory for ET_EXEC files and print when we find one */
1301 static void scanelf_dir(const char *path)
1302 {
1303 register DIR *dir;
1304 register struct dirent *dentry;
1305 struct stat st_top, st;
1306 char buf[__PAX_UTILS_PATH_MAX];
1307 size_t pathlen = 0, len = 0;
1308
1309 /* make sure path exists */
1310 if (lstat(path, &st_top) == -1) {
1311 if (be_verbose > 2) printf("%s: does not exist\n", path);
1312 return;
1313 }
1314
1315 /* ok, if it isn't a directory, assume we can open it */
1316 if (!S_ISDIR(st_top.st_mode)) {
1317 scanelf_file(path);
1318 return;
1319 }
1320
1321 /* now scan the dir looking for fun stuff */
1322 if ((dir = opendir(path)) == NULL) {
1323 warnf("could not opendir %s: %s", path, strerror(errno));
1324 return;
1325 }
1326 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1327
1328 pathlen = strlen(path);
1329 while ((dentry = readdir(dir))) {
1330 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1331 continue;
1332 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
1333 if (len >= sizeof(buf)) {
1334 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1335 (unsigned long)len, (unsigned long)sizeof(buf));
1336 continue;
1337 }
1338 snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name);
1339 if (lstat(buf, &st) != -1) {
1340 if (S_ISREG(st.st_mode))
1341 scanelf_file(buf);
1342 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1343 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1344 scanelf_dir(buf);
1345 }
1346 }
1347 }
1348 closedir(dir);
1349 }
1350
1351 static int scanelf_from_file(const char *filename)
1352 {
1353 FILE *fp = NULL;
1354 char *p;
1355 char path[__PAX_UTILS_PATH_MAX];
1356
1357 if (strcmp(filename, "-") == 0)
1358 fp = stdin;
1359 else if ((fp = fopen(filename, "r")) == NULL)
1360 return 1;
1361
1362 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1363 if ((p = strchr(path, '\n')) != NULL)
1364 *p = 0;
1365 search_path = path;
1366 scanelf_dir(path);
1367 }
1368 if (fp != stdin)
1369 fclose(fp);
1370 return 0;
1371 }
1372
1373 #if defined(__GLIBC__) || defined(__UCLIBC__)
1374 static int load_ld_so_conf(int i, const char *fname)
1375 {
1376 FILE *fp = NULL;
1377 char *p;
1378 char path[__PAX_UTILS_PATH_MAX];
1379
1380 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
1381 return i;
1382
1383 if ((fp = fopen(fname, "r")) == NULL)
1384 return i;
1385
1386 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1387 if ((p = strrchr(path, '\r')) != NULL)
1388 *p = 0;
1389 if ((p = strchr(path, '\n')) != NULL)
1390 *p = 0;
1391 // recursive includes of the same file will make this segfault.
1392 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1393 glob64_t gl;
1394 size_t x;
1395 char gpath[__PAX_UTILS_PATH_MAX];
1396
1397 memset(gpath, 0, sizeof(gpath));
1398
1399 if (path[8] != '/')
1400 snprintf(gpath, sizeof(gpath), "/etc/%s", &path[8]);
1401 else
1402 strncpy(gpath, &path[8], sizeof(gpath));
1403
1404 if ((glob64(gpath, 0, NULL, &gl)) == 0) {
1405 for (x = 0; x < gl.gl_pathc; ++x) {
1406 /* try to avoid direct loops */
1407 if (strcmp(gl.gl_pathv[x], fname) == 0)
1408 continue;
1409 i = load_ld_so_conf(i, gl.gl_pathv[x]);
1410 if (i + 1 >= sizeof(ldpaths) / sizeof(*ldpaths)) {
1411 globfree64(&gl);
1412 return i;
1413 }
1414 }
1415 globfree64 (&gl);
1416 continue;
1417 } else
1418 abort();
1419 }
1420 if (*path != '/')
1421 continue;
1422
1423 ldpaths[i++] = xstrdup(path);
1424
1425 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
1426 break;
1427 }
1428 ldpaths[i] = NULL;
1429
1430 fclose(fp);
1431 return i;
1432 }
1433 #endif
1434
1435 #if defined(__FreeBSD__) || (__DragonFly__)
1436 static int load_ld_so_hints(int i, const char *fname)
1437 {
1438 FILE *fp = NULL;
1439 char *b = NULL, *p;
1440 struct elfhints_hdr hdr;
1441
1442 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
1443 return i;
1444
1445 if ((fp = fopen(fname, "r")) == NULL)
1446 return i;
1447
1448 if ( fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1449 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1450 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1
1451 ) {
1452 fclose(fp);
1453 return i;
1454 }
1455
1456 b = (char*)malloc(hdr.dirlistlen+1);
1457 if ( fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1 ) {
1458 fclose(fp);
1459 free(b);
1460 return i;
1461 }
1462
1463 while ( (p = strsep(&b, ":")) ) {
1464 if ( *p == '\0' ) continue;
1465 ldpaths[i++] = xstrdup(p);
1466
1467 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
1468 break;
1469 }
1470 ldpaths[i] = NULL;
1471
1472 free(b);
1473 fclose(fp);
1474 return i;
1475 }
1476 #endif
1477
1478 /* scan /etc/ld.so.conf for paths */
1479 static void scanelf_ldpath()
1480 {
1481 char scan_l, scan_ul, scan_ull;
1482 int i = 0;
1483
1484 if (!ldpaths[0])
1485 err("Unable to load any paths from ld.so.conf");
1486
1487 scan_l = scan_ul = scan_ull = 0;
1488
1489 while (ldpaths[i]) {
1490 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
1491 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
1492 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
1493 scanelf_dir(ldpaths[i]);
1494 ++i;
1495 }
1496
1497 if (!scan_l) scanelf_dir("/lib");
1498 if (!scan_ul) scanelf_dir("/usr/lib");
1499 if (!scan_ull) scanelf_dir("/usr/local/lib");
1500 }
1501
1502 /* scan env PATH for paths */
1503 static void scanelf_envpath()
1504 {
1505 char *path, *p;
1506
1507 path = getenv("PATH");
1508 if (!path)
1509 err("PATH is not set in your env !");
1510 path = xstrdup(path);
1511
1512 while ((p = strrchr(path, ':')) != NULL) {
1513 scanelf_dir(p + 1);
1514 *p = 0;
1515 }
1516
1517 free(path);
1518 }
1519
1520 /* usage / invocation handling functions */
1521 #define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:BhV"
1522 #define a_argument required_argument
1523 static struct option const long_opts[] = {
1524 {"path", no_argument, NULL, 'p'},
1525 {"ldpath", no_argument, NULL, 'l'},
1526 {"recursive", no_argument, NULL, 'R'},
1527 {"mount", no_argument, NULL, 'm'},
1528 {"symlink", no_argument, NULL, 'y'},
1529 {"archives", no_argument, NULL, 'A'},
1530 {"ldcache", no_argument, NULL, 'L'},
1531 {"fix", no_argument, NULL, 'X'},
1532 {"setpax", a_argument, NULL, 'z'},
1533 {"pax", no_argument, NULL, 'x'},
1534 {"header", no_argument, NULL, 'e'},
1535 {"textrel", no_argument, NULL, 't'},
1536 {"rpath", no_argument, NULL, 'r'},
1537 {"needed", no_argument, NULL, 'n'},
1538 {"interp", no_argument, NULL, 'i'},
1539 {"bind", no_argument, NULL, 'b'},
1540 {"soname", no_argument, NULL, 'S'},
1541 {"symbol", a_argument, NULL, 's'},
1542 {"section", a_argument, NULL, 'k'},
1543 {"lib", a_argument, NULL, 'N'},
1544 {"gmatch", no_argument, NULL, 'g'},
1545 {"textrels", no_argument, NULL, 'T'},
1546 {"etype", a_argument, NULL, 'E'},
1547 {"bits", a_argument, NULL, 'M'},
1548 {"all", no_argument, NULL, 'a'},
1549 {"quiet", no_argument, NULL, 'q'},
1550 {"verbose", no_argument, NULL, 'v'},
1551 {"format", a_argument, NULL, 'F'},
1552 {"from", a_argument, NULL, 'f'},
1553 {"file", a_argument, NULL, 'o'},
1554 {"nobanner", no_argument, NULL, 'B'},
1555 {"help", no_argument, NULL, 'h'},
1556 {"version", no_argument, NULL, 'V'},
1557 {NULL, no_argument, NULL, 0x0}
1558 };
1559
1560 static const char *opts_help[] = {
1561 "Scan all directories in PATH environment",
1562 "Scan all directories in /etc/ld.so.conf",
1563 "Scan directories recursively",
1564 "Don't recursively cross mount points",
1565 "Don't scan symlinks",
1566 "Scan archives (.a files)",
1567 "Utilize ld.so.cache information (use with -r/-n)",
1568 "Try and 'fix' bad things (use with -r/-e)",
1569 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1570 "Print PaX markings",
1571 "Print GNU_STACK/PT_LOAD markings",
1572 "Print TEXTREL information",
1573 "Print RPATH information",
1574 "Print NEEDED information",
1575 "Print INTERP information",
1576 "Print BIND information",
1577 "Print SONAME information",
1578 "Find a specified symbol",
1579 "Find a specified section",
1580 "Find a specified library",
1581 "Use strncmp to match libraries. (use with -N)",
1582 "Locate cause of TEXTREL",
1583 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1584 "Print only ELF files matching numeric bits",
1585 "Print all scanned info (-x -e -t -r -b)\n",
1586 "Only output 'bad' things",
1587 "Be verbose (can be specified more than once)",
1588 "Use specified format for output",
1589 "Read input stream from a filename",
1590 "Write output stream to a filename",
1591 "Don't display the header",
1592 "Print this help and exit",
1593 "Print version and exit",
1594 NULL
1595 };
1596
1597 /* display usage and exit */
1598 static void usage(int status)
1599 {
1600 unsigned long i;
1601 printf("* Scan ELF binaries for stuff\n\n"
1602 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1603 printf("Options: -[%s]\n", PARSE_FLAGS);
1604 for (i = 0; long_opts[i].name; ++i)
1605 if (long_opts[i].has_arg == no_argument)
1606 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
1607 long_opts[i].name, opts_help[i]);
1608 else
1609 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
1610 long_opts[i].name, opts_help[i]);
1611
1612 if (status != EXIT_SUCCESS)
1613 exit(status);
1614
1615 puts("\nThe format modifiers for the -F option are:");
1616 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1617 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1618 puts(" i INTERP \tb BIND \ts symbol");
1619 puts(" N library \to Type \tT TEXTRELs");
1620 puts(" S SONAME \tk section");
1621 puts(" p filename (with search path removed)");
1622 puts(" f filename (short name/basename)");
1623 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1624
1625 puts("\nELF Etypes:");
1626 print_etypes(stdout);
1627
1628 exit(status);
1629 }
1630
1631 /* parse command line arguments and preform needed actions */
1632 static void parseargs(int argc, char *argv[])
1633 {
1634 int i;
1635 const char *from_file = NULL;
1636
1637 opterr = 0;
1638 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1639 switch (i) {
1640
1641 case 'V':
1642 printf("pax-utils-%s: %s compiled %s\n%s\n"
1643 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
1644 VERSION, __FILE__, __DATE__, rcsid, argv0);
1645 exit(EXIT_SUCCESS);
1646 break;
1647 case 'h': usage(EXIT_SUCCESS); break;
1648 case 'f':
1649 if (from_file) warn("You prob don't want to specify -f twice");
1650 from_file = optarg;
1651 break;
1652 case 'E':
1653 strncpy(match_etypes, optarg, sizeof(match_etypes));
1654 break;
1655 case 'M':
1656 match_bits = atoi(optarg);
1657 break;
1658 case 'o': {
1659 if (freopen(optarg, "w", stdout) == NULL)
1660 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1661 break;
1662 }
1663 case 'k':
1664 if (find_section) warn("You prob don't want to specify -k twice");
1665 find_section = optarg;
1666 break;
1667 case 's': {
1668 if (find_sym) warn("You prob don't want to specify -s twice");
1669 find_sym = optarg;
1670 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1671 sprintf(versioned_symname, "%s@", find_sym);
1672 break;
1673 }
1674 case 'N': {
1675 if (find_lib) warn("You prob don't want to specify -N twice");
1676 find_lib = optarg;
1677 break;
1678 }
1679
1680 case 'F': {
1681 if (out_format) warn("You prob don't want to specify -F twice");
1682 out_format = optarg;
1683 break;
1684 }
1685 case 'z': {
1686 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1687 size_t x;
1688
1689 for (x = 0 ; x < strlen(optarg); x++) {
1690 switch(optarg[x]) {
1691 case 'p':
1692 case 'P':
1693 do_state(optarg[x], PAGEEXEC);
1694 break;
1695 case 's':
1696 case 'S':
1697 do_state(optarg[x], SEGMEXEC);
1698 break;
1699 case 'm':
1700 case 'M':
1701 do_state(optarg[x], MPROTECT);
1702 break;
1703 case 'e':
1704 case 'E':
1705 do_state(optarg[x], EMUTRAMP);
1706 break;
1707 case 'r':
1708 case 'R':
1709 do_state(optarg[x], RANDMMAP);
1710 break;
1711 case 'x':
1712 case 'X':
1713 do_state(optarg[x], RANDEXEC);
1714 break;
1715 default:
1716 break;
1717 }
1718 }
1719 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
1720 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
1721 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
1722 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
1723 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1724 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1725 setpax = flags;
1726 break;
1727 }
1728 case 'g': gmatch = 1; break;
1729 case 'L': use_ldcache = 1; break;
1730 case 'y': scan_symlink = 0; break;
1731 case 'A': scan_archives = 1; break;
1732 case 'B': show_banner = 0; break;
1733 case 'l': scan_ldpath = 1; break;
1734 case 'p': scan_envpath = 1; break;
1735 case 'R': dir_recurse = 1; break;
1736 case 'm': dir_crossmount = 0; break;
1737 case 'X': ++fix_elf; break;
1738 case 'x': show_pax = 1; break;
1739 case 'e': show_phdr = 1; break;
1740 case 't': show_textrel = 1; break;
1741 case 'r': show_rpath = 1; break;
1742 case 'n': show_needed = 1; break;
1743 case 'i': show_interp = 1; break;
1744 case 'b': show_bind = 1; break;
1745 case 'S': show_soname = 1; break;
1746 case 'T': show_textrels = 1; break;
1747 case 'q': be_quiet = 1; break;
1748 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1749 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
1750
1751 case ':':
1752 err("Option '%c' is missing parameter", optopt);
1753 case '?':
1754 err("Unknown option '%c' or argument missing", optopt);
1755 default:
1756 err("Unhandled option '%c'; please report this", i);
1757 }
1758 }
1759
1760 /* let the format option override all other options */
1761 if (out_format) {
1762 show_pax = show_phdr = show_textrel = show_rpath = \
1763 show_needed = show_interp = show_bind = show_soname = \
1764 show_textrels = 0;
1765 for (i = 0; out_format[i]; ++i) {
1766 if (!IS_MODIFIER(out_format[i])) continue;
1767
1768 switch (out_format[++i]) {
1769 case '+': break;
1770 case '%': break;
1771 case '#': break;
1772 case 'F': break;
1773 case 'p': break;
1774 case 'f': break;
1775 case 'k': break;
1776 case 's': break;
1777 case 'N': break;
1778 case 'o': break;
1779 case 'x': show_pax = 1; break;
1780 case 'e': show_phdr = 1; break;
1781 case 't': show_textrel = 1; break;
1782 case 'r': show_rpath = 1; break;
1783 case 'n': show_needed = 1; break;
1784 case 'i': show_interp = 1; break;
1785 case 'b': show_bind = 1; break;
1786 case 'S': show_soname = 1; break;
1787 case 'T': show_textrels = 1; break;
1788 default:
1789 err("Invalid format specifier '%c' (byte %i)",
1790 out_format[i], i+1);
1791 }
1792 }
1793
1794 /* construct our default format */
1795 } else {
1796 size_t fmt_len = 30;
1797 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
1798 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1799 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1800 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1801 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1802 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1803 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1804 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1805 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1806 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1807 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1808 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1809 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1810 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1811 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1812 }
1813 if (be_verbose > 2) printf("Format: %s\n", out_format);
1814
1815 /* now lets actually do the scanning */
1816 if (scan_ldpath || use_ldcache)
1817 #if defined(__GLIBC__) || defined(__UCLIBC__)
1818 load_ld_so_conf(0, "/etc/ld.so.conf");
1819 #elif defined(__FreeBSD__) || defined(__DragonFly__)
1820 load_ld_so_hints(0, _PATH_ELF_HINTS);
1821 #endif
1822 if (scan_ldpath) scanelf_ldpath();
1823 if (scan_envpath) scanelf_envpath();
1824 if (!from_file && optind == argc && ttyname(0) == NULL)
1825 from_file = "-";
1826 if (from_file) {
1827 scanelf_from_file(from_file);
1828 from_file = *argv;
1829 }
1830 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1831 err("Nothing to scan !?");
1832 while (optind < argc) {
1833 search_path = argv[optind++];
1834 scanelf_dir(search_path);
1835 }
1836
1837 /* clean up */
1838 if (versioned_symname) free(versioned_symname);
1839 for (i = 0; ldpaths[i]; ++i)
1840 free(ldpaths[i]);
1841
1842 if (ldcache != 0)
1843 munmap(ldcache, ldcache_size);
1844 }
1845
1846 static char **get_split_env(const char *envvar) {
1847 char **envvals = NULL;
1848 char *saveptr = NULL;
1849 char *env;
1850 char *s;
1851 int nentry;
1852
1853 if ((env = getenv(envvar)) == NULL)
1854 return NULL;
1855
1856 env = xstrdup(env);
1857 if (env == NULL)
1858 return NULL;
1859
1860 nentry = 0;
1861 for (s = strtok_r(env, " \t\n", &saveptr); s != NULL; s = strtok_r(NULL, " \t\n", &saveptr)) {
1862 if ((envvals = xrealloc(envvals, sizeof(char *)*(nentry+1))) == NULL)
1863 return NULL;
1864 envvals[nentry++] = s;
1865 }
1866 envvals[nentry] = NULL;
1867
1868 return envvals;
1869 }
1870
1871 static void parseenv() {
1872 qa_textrels=get_split_env("QA_TEXTRELS");
1873 qa_execstack=get_split_env("QA_EXECSTACK");
1874 qa_wx_load=get_split_env("QA_WX_LOAD");
1875 }
1876
1877
1878
1879 int main(int argc, char *argv[])
1880 {
1881 if (argc < 2)
1882 usage(EXIT_FAILURE);
1883 parseenv();
1884 parseargs(argc, argv);
1885 fclose(stdout);
1886 #ifdef __BOUNDS_CHECKING_ON
1887 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()");
1888 #endif
1889 return EXIT_SUCCESS;
1890 }

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