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Revision 1.153 - (show annotations) (download) (as text)
Wed May 17 21:45:20 2006 UTC (7 years, 11 months ago) by solar
Branch: MAIN
Changes since 1.152: +3 -3 lines
File MIME type: text/x-csrc
- make sure we really want to read from stdin

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 1.152 2006/05/14 23:49:56 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 1.152 2006/05/14 23:49:56 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 /* utility funcs */
89 static char *xstrdup(const char *s)
90 {
91 char *ret = strdup(s);
92 if (!ret) err("Could not strdup(): %s", strerror(errno));
93 return ret;
94 }
95 static void *xmalloc(size_t size)
96 {
97 void *ret = malloc(size);
98 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
99 return ret;
100 }
101 static void *xrealloc(void *ptr, size_t size)
102 {
103 void *ret = realloc(ptr, size);
104 if (!ret) err("Could not realloc() %li bytes", (unsigned long)size);
105 return ret;
106 }
107 static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
108 {
109 size_t new_len;
110
111 new_len = strlen(*dst) + strlen(src);
112 if (*curr_len <= new_len) {
113 *curr_len = new_len + (*curr_len / 2);
114 *dst = realloc(*dst, *curr_len);
115 if (!*dst)
116 err("could not realloc() %li bytes", (unsigned long)*curr_len);
117 }
118
119 if (n)
120 strncat(*dst, src, n);
121 else
122 strcat(*dst, src);
123 }
124 static inline void xchrcat(char **dst, const char append, size_t *curr_len)
125 {
126 static char my_app[2];
127 my_app[0] = append;
128 my_app[1] = '\0';
129 xstrcat(dst, my_app, curr_len);
130 }
131
132 /* Match filename against entries in matchlist, return TRUE
133 * if the file is listed */
134 static int file_matches_list(const char *filename, char **matchlist)
135 {
136 char **file;
137 char *match;
138 char buf[__PAX_UTILS_PATH_MAX];
139
140 if (matchlist == NULL)
141 return 0;
142
143 for (file = matchlist; *file != NULL; file++) {
144 if (search_path) {
145 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
146 match = buf;
147 } else {
148 match = *file;
149 }
150 if (fnmatch(match, filename, 0) == 0)
151 return 1;
152 }
153 return 0;
154 }
155
156
157
158 /* sub-funcs for scanelf_file() */
159 static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
160 {
161 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
162 #define GET_SYMTABS(B) \
163 if (elf->elf_class == ELFCLASS ## B) { \
164 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
165 /* debug sections */ \
166 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
167 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
168 /* runtime sections */ \
169 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
170 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
171 if (symtab && dynsym) { \
172 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \
173 } else { \
174 *sym = (void*)(symtab ? symtab : dynsym); \
175 } \
176 if (strtab && dynstr) { \
177 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \
178 } else { \
179 *tab = (void*)(strtab ? strtab : dynstr); \
180 } \
181 }
182 GET_SYMTABS(32)
183 GET_SYMTABS(64)
184 }
185
186 static char *scanelf_file_pax(elfobj *elf, char *found_pax)
187 {
188 static char ret[7];
189 unsigned long i, shown;
190
191 if (!show_pax) return NULL;
192
193 shown = 0;
194 memset(&ret, 0, sizeof(ret));
195
196 if (elf->phdr) {
197 #define SHOW_PAX(B) \
198 if (elf->elf_class == ELFCLASS ## B) { \
199 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
200 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
201 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
202 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
203 continue; \
204 if (fix_elf && setpax) { \
205 /* set the paxctl flags */ \
206 ESET(phdr[i].p_flags, setpax); \
207 } \
208 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
209 continue; \
210 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
211 *found_pax = 1; \
212 ++shown; \
213 break; \
214 } \
215 }
216 SHOW_PAX(32)
217 SHOW_PAX(64)
218 }
219
220
221 if (fix_elf && setpax) {
222 /* set the chpax settings */
223 if (elf->elf_class == ELFCLASS32) {
224 if (EHDR32(elf->ehdr)->e_type == ET_DYN || EHDR32(elf->ehdr)->e_type == ET_EXEC)
225 ESET(EHDR32(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
226 } else {
227 if (EHDR64(elf->ehdr)->e_type == ET_DYN || EHDR64(elf->ehdr)->e_type == ET_EXEC)
228 ESET(EHDR64(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
229 }
230 }
231
232 /* fall back to EI_PAX if no PT_PAX was found */
233 if (!*ret) {
234 static char *paxflags;
235 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
236 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
237 *found_pax = 1;
238 return (be_wewy_wewy_quiet ? NULL : paxflags);
239 }
240 strncpy(ret, paxflags, sizeof(ret));
241 }
242
243 if (be_wewy_wewy_quiet || (be_quiet && !shown))
244 return NULL;
245 else
246 return ret;
247 }
248
249 static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
250 {
251 static char ret[12];
252 char *found;
253 unsigned long i, shown, multi_stack, multi_relro, multi_load;
254 int max_pt_load;
255
256 if (!show_phdr) return NULL;
257
258 memcpy(ret, "--- --- ---\0", 12);
259
260 shown = 0;
261 multi_stack = multi_relro = multi_load = 0;
262 max_pt_load = elf_max_pt_load(elf);
263
264 #define NOTE_GNU_STACK ".note.GNU-stack"
265 #define SHOW_PHDR(B) \
266 if (elf->elf_class == ELFCLASS ## B) { \
267 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
268 Elf ## B ## _Off offset; \
269 uint32_t flags, check_flags; \
270 if (elf->phdr != NULL) { \
271 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
272 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
273 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
274 if (multi_stack++) \
275 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
276 if (file_matches_list(elf->filename, qa_execstack)) \
277 continue; \
278 found = found_phdr; \
279 offset = 0; \
280 check_flags = PF_X; \
281 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
282 if (multi_relro++) \
283 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
284 found = found_relro; \
285 offset = 4; \
286 check_flags = PF_X; \
287 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
288 if (ehdr->e_type == ET_DYN || ehdr->e_type == ET_EXEC) \
289 if (multi_load++ > max_pt_load) \
290 warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
291 if (file_matches_list(elf->filename, qa_wx_load)) \
292 continue; \
293 found = found_load; \
294 offset = 8; \
295 check_flags = PF_W|PF_X; \
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
686 #if defined(__GLIBC__) || defined(__UCLIBC__)
687
688 static char *lookup_cache_lib(elfobj *elf, char *fname)
689 {
690 int fd = 0;
691 char *strs;
692 static char buf[__PAX_UTILS_PATH_MAX] = "";
693 const char *cachefile = "/etc/ld.so.cache";
694 struct stat st;
695
696 typedef struct {
697 char magic[LDSO_CACHE_MAGIC_LEN];
698 char version[LDSO_CACHE_VER_LEN];
699 int nlibs;
700 } header_t;
701 header_t *header;
702
703 typedef struct {
704 int flags;
705 int sooffset;
706 int liboffset;
707 } libentry_t;
708 libentry_t *libent;
709
710 if (fname == NULL)
711 return NULL;
712
713 if (ldcache == 0) {
714 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1)
715 return NULL;
716
717 /* cache these values so we only map/unmap the cache file once */
718 ldcache_size = st.st_size;
719 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
720
721 close(fd);
722
723 if (ldcache == (caddr_t)-1) {
724 ldcache = 0;
725 return NULL;
726 }
727
728 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
729 return NULL;
730 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
731 return NULL;
732 }
733
734 header = (header_t *) ldcache;
735 libent = (libentry_t *) (ldcache + sizeof(header_t));
736 strs = (char *) &libent[header->nlibs];
737
738 for (fd = 0; fd < header->nlibs; fd++) {
739 /* this should be more fine grained, but for now we assume that
740 * diff arches will not be cached together. and we ignore the
741 * the different multilib mips cases. */
742 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
743 continue;
744 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
745 continue;
746
747 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
748 continue;
749 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
750 }
751 return buf;
752 }
753
754 #else
755 #warning Cache support not implemented for your target
756 static char *lookup_cache_lib(elfobj *elf, char *fname)
757 {
758 return NULL;
759 }
760 #endif
761
762 static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
763 {
764 unsigned long i;
765 char *needed;
766 void *strtbl_void;
767 char *p;
768
769 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
770
771 strtbl_void = elf_findsecbyname(elf, ".dynstr");
772
773 if (elf->phdr && strtbl_void) {
774 #define SHOW_NEEDED(B) \
775 if (elf->elf_class == ELFCLASS ## B) { \
776 Elf ## B ## _Dyn *dyn; \
777 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
778 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
779 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
780 Elf ## B ## _Off offset; \
781 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
782 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
783 offset = EGET(phdr[i].p_offset); \
784 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
785 dyn = DYN ## B (elf->data + offset); \
786 while (EGET(dyn->d_tag) != DT_NULL) { \
787 if (EGET(dyn->d_tag) == DT_NEEDED) { \
788 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
789 if (offset >= (Elf ## B ## _Off)elf->len) { \
790 ++dyn; \
791 continue; \
792 } \
793 needed = (char*)(elf->data + offset); \
794 if (op == 0) { \
795 if (!be_wewy_wewy_quiet) { \
796 if (*found_needed) xchrcat(ret, ',', ret_len); \
797 if (use_ldcache) \
798 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
799 needed = p; \
800 xstrcat(ret, needed, ret_len); \
801 } \
802 *found_needed = 1; \
803 } else { \
804 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \
805 *found_lib = 1; \
806 return (be_wewy_wewy_quiet ? NULL : needed); \
807 } \
808 } \
809 } \
810 ++dyn; \
811 } \
812 } }
813 SHOW_NEEDED(32)
814 SHOW_NEEDED(64)
815 if (op == 0 && !*found_needed && be_verbose)
816 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
817 }
818
819 return NULL;
820 }
821 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
822 {
823 void *strtbl_void;
824
825 if (!show_interp) return NULL;
826
827 strtbl_void = elf_findsecbyname(elf, ".interp");
828
829 if (strtbl_void) {
830 #define SHOW_INTERP(B) \
831 if (elf->elf_class == ELFCLASS ## B) { \
832 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
833 *found_interp = 1; \
834 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
835 }
836 SHOW_INTERP(32)
837 SHOW_INTERP(64)
838 }
839 return NULL;
840 }
841 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
842 {
843 unsigned long i;
844 struct stat s;
845 char dynamic = 0;
846
847 if (!show_bind) return NULL;
848 if (!elf->phdr) return NULL;
849
850 #define SHOW_BIND(B) \
851 if (elf->elf_class == ELFCLASS ## B) { \
852 Elf ## B ## _Dyn *dyn; \
853 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
854 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
855 Elf ## B ## _Off offset; \
856 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
857 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
858 dynamic = 1; \
859 offset = EGET(phdr[i].p_offset); \
860 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
861 dyn = DYN ## B (elf->data + offset); \
862 while (EGET(dyn->d_tag) != DT_NULL) { \
863 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
864 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
865 { \
866 if (be_quiet) return NULL; \
867 *found_bind = 1; \
868 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
869 } \
870 ++dyn; \
871 } \
872 } \
873 }
874 SHOW_BIND(32)
875 SHOW_BIND(64)
876
877 if (be_wewy_wewy_quiet) return NULL;
878
879 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) {
880 return NULL;
881 } else {
882 *found_bind = 1;
883 return (char *) (dynamic ? "LAZY" : "STATIC");
884 }
885 }
886 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
887 {
888 unsigned long i;
889 char *soname;
890 void *strtbl_void;
891
892 if (!show_soname) return NULL;
893
894 strtbl_void = elf_findsecbyname(elf, ".dynstr");
895
896 if (elf->phdr && strtbl_void) {
897 #define SHOW_SONAME(B) \
898 if (elf->elf_class == ELFCLASS ## B) { \
899 Elf ## B ## _Dyn *dyn; \
900 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
901 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
902 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
903 Elf ## B ## _Off offset; \
904 /* only look for soname in shared objects */ \
905 if (ehdr->e_type != ET_DYN) \
906 return NULL; \
907 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
908 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
909 offset = EGET(phdr[i].p_offset); \
910 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
911 dyn = DYN ## B (elf->data + offset); \
912 while (EGET(dyn->d_tag) != DT_NULL) { \
913 if (EGET(dyn->d_tag) == DT_SONAME) { \
914 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
915 if (offset >= (Elf ## B ## _Off)elf->len) { \
916 ++dyn; \
917 continue; \
918 } \
919 soname = (char*)(elf->data + offset); \
920 *found_soname = 1; \
921 return (be_wewy_wewy_quiet ? NULL : soname); \
922 } \
923 ++dyn; \
924 } \
925 } }
926 SHOW_SONAME(32)
927 SHOW_SONAME(64)
928 }
929
930 return NULL;
931 }
932 static char *scanelf_file_sym(elfobj *elf, char *found_sym)
933 {
934 unsigned long i;
935 char *ret;
936 void *symtab_void, *strtab_void;
937
938 if (!find_sym) return NULL;
939 ret = find_sym;
940
941 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
942
943 if (symtab_void && strtab_void) {
944 #define FIND_SYM(B) \
945 if (elf->elf_class == ELFCLASS ## B) { \
946 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
947 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
948 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
949 unsigned long cnt = EGET(symtab->sh_entsize); \
950 char *symname; \
951 if (cnt) \
952 cnt = EGET(symtab->sh_size) / cnt; \
953 for (i = 0; i < cnt; ++i) { \
954 if (sym->st_name) { \
955 /* make sure the symbol name is in acceptable memory range */ \
956 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
957 if ((void*)symname > (void*)elf->data_end) { \
958 warnf("%s: corrupt ELF symbols", elf->filename); \
959 ++sym; \
960 continue; \
961 } \
962 /* debug display ... show all symbols and some extra info */ \
963 if (*ret == '*') { \
964 printf("%s(%s) %5lX %15s %s\n", \
965 ((*found_sym == 0) ? "\n\t" : "\t"), \
966 elf->base_filename, \
967 (unsigned long)sym->st_size, \
968 get_elfstttype(sym->st_info), \
969 symname); \
970 *found_sym = 1; \
971 } else { \
972 /* allow the user to specify a comma delimited list of symbols to search for */ \
973 char *this_sym, *next_sym; \
974 this_sym = ret; \
975 do { \
976 next_sym = strchr(this_sym, ','); \
977 if (next_sym == NULL) \
978 next_sym = this_sym + strlen(this_sym); \
979 /* do we want a defined symbol ? */ \
980 if (*this_sym == '+') { \
981 if (sym->st_shndx == SHN_UNDEF) \
982 goto skip_this_sym##B; \
983 ++this_sym; \
984 /* do we want an undefined symbol ? */ \
985 } else if (*this_sym == '-') { \
986 if (sym->st_shndx != SHN_UNDEF) \
987 goto skip_this_sym##B; \
988 ++this_sym; \
989 } \
990 /* ok, lets compare the name now */ \
991 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
992 (strncmp(symname, versioned_symname, strlen(versioned_symname)) == 0)) { \
993 if (be_semi_verbose) { \
994 char buf[126]; \
995 snprintf(buf, sizeof(buf), "%lX %s %s", \
996 (unsigned long)sym->st_size, get_elfstttype(sym->st_info), this_sym); \
997 ret = buf; \
998 } else \
999 ret = this_sym; \
1000 (*found_sym)++; \
1001 goto break_out; \
1002 } \
1003 skip_this_sym##B: this_sym = next_sym + 1; \
1004 } while (*next_sym != '\0'); \
1005 } \
1006 } \
1007 ++sym; \
1008 } }
1009 FIND_SYM(32)
1010 FIND_SYM(64)
1011 }
1012
1013 break_out:
1014 if (be_wewy_wewy_quiet) return NULL;
1015
1016 if (*find_sym != '*' && *found_sym)
1017 return ret;
1018 if (be_quiet)
1019 return NULL;
1020 else
1021 return (char *)" - ";
1022 }
1023
1024
1025 static char *scanelf_file_sections(elfobj *elf, char *found_section)
1026 {
1027 if (!find_section)
1028 return NULL;
1029
1030 #define FIND_SECTION(B) \
1031 if (elf->elf_class == ELFCLASS ## B) { \
1032 int invert; \
1033 Elf ## B ## _Shdr *section; \
1034 invert = (*find_section == '!' ? 1 : 0); \
1035 section = SHDR ## B (elf_findsecbyname(elf, find_section+invert)); \
1036 if ((section == NULL && invert) || (section != NULL && !invert)) \
1037 *found_section = 1; \
1038 }
1039 FIND_SECTION(32)
1040 FIND_SECTION(64)
1041
1042 if (be_wewy_wewy_quiet)
1043 return NULL;
1044
1045 if (*found_section)
1046 return find_section;
1047
1048 if (be_quiet)
1049 return NULL;
1050 else
1051 return (char *)" - ";
1052 }
1053
1054 /* scan an elf file and show all the fun stuff */
1055 #define prints(str) write(fileno(stdout), str, strlen(str))
1056 static int scanelf_elfobj(elfobj *elf)
1057 {
1058 unsigned long i;
1059 char found_pax, found_phdr, found_relro, found_load, found_textrel,
1060 found_rpath, found_needed, found_interp, found_bind, found_soname,
1061 found_sym, found_lib, found_file, found_textrels, found_section;
1062 static char *out_buffer = NULL;
1063 static size_t out_len;
1064
1065 found_pax = found_phdr = found_relro = found_load = found_textrel = \
1066 found_rpath = found_needed = found_interp = found_bind = found_soname = \
1067 found_sym = found_lib = found_file = found_textrels = found_section = 0;
1068
1069 if (be_verbose > 2)
1070 printf("%s: scanning file {%s,%s}\n", elf->filename,
1071 get_elfeitype(EI_CLASS, elf->elf_class),
1072 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
1073 else if (be_verbose > 1)
1074 printf("%s: scanning file\n", elf->filename);
1075
1076 /* init output buffer */
1077 if (!out_buffer) {
1078 out_len = sizeof(char) * 80;
1079 out_buffer = (char*)xmalloc(out_len);
1080 }
1081 *out_buffer = '\0';
1082
1083 /* show the header */
1084 if (!be_quiet && show_banner) {
1085 for (i = 0; out_format[i]; ++i) {
1086 if (!IS_MODIFIER(out_format[i])) continue;
1087
1088 switch (out_format[++i]) {
1089 case '+': break;
1090 case '%': break;
1091 case '#': break;
1092 case 'F':
1093 case 'p':
1094 case 'f': prints("FILE "); found_file = 1; break;
1095 case 'o': prints(" TYPE "); break;
1096 case 'x': prints(" PAX "); break;
1097 case 'e': prints("STK/REL/PTL "); break;
1098 case 't': prints("TEXTREL "); break;
1099 case 'r': prints("RPATH "); break;
1100 case 'n': prints("NEEDED "); break;
1101 case 'i': prints("INTERP "); break;
1102 case 'b': prints("BIND "); break;
1103 case 'S': prints("SONAME "); break;
1104 case 's': prints("SYM "); break;
1105 case 'N': prints("LIB "); break;
1106 case 'T': prints("TEXTRELS "); break;
1107 case 'k': prints("SECTION "); break;
1108 default: warnf("'%c' has no title ?", out_format[i]);
1109 }
1110 }
1111 if (!found_file) prints("FILE ");
1112 prints("\n");
1113 found_file = 0;
1114 show_banner = 0;
1115 }
1116
1117 /* dump all the good stuff */
1118 for (i = 0; out_format[i]; ++i) {
1119 const char *out;
1120 const char *tmp;
1121
1122 if (!IS_MODIFIER(out_format[i])) {
1123 xchrcat(&out_buffer, out_format[i], &out_len);
1124 continue;
1125 }
1126
1127 out = NULL;
1128 be_wewy_wewy_quiet = (out_format[i] == '#');
1129 be_semi_verbose = (out_format[i] == '+');
1130 switch (out_format[++i]) {
1131 case '+':
1132 case '%':
1133 case '#':
1134 xchrcat(&out_buffer, out_format[i], &out_len); break;
1135 case 'F':
1136 found_file = 1;
1137 if (be_wewy_wewy_quiet) break;
1138 xstrcat(&out_buffer, elf->filename, &out_len);
1139 break;
1140 case 'p':
1141 found_file = 1;
1142 if (be_wewy_wewy_quiet) break;
1143 tmp = elf->filename;
1144 if (search_path) {
1145 ssize_t len_search = strlen(search_path);
1146 ssize_t len_file = strlen(elf->filename);
1147 if (!strncmp(elf->filename, search_path, len_search) && \
1148 len_file > len_search)
1149 tmp += len_search;
1150 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1151 }
1152 xstrcat(&out_buffer, tmp, &out_len);
1153 break;
1154 case 'f':
1155 found_file = 1;
1156 if (be_wewy_wewy_quiet) break;
1157 tmp = strrchr(elf->filename, '/');
1158 tmp = (tmp == NULL ? elf->filename : tmp+1);
1159 xstrcat(&out_buffer, tmp, &out_len);
1160 break;
1161 case 'o': out = get_elfetype(elf); break;
1162 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
1163 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
1164 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1165 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
1166 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1167 case 'n':
1168 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
1169 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1170 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1171 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
1172 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1173 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1174 default: warnf("'%c' has no scan code?", out_format[i]);
1175 }
1176 if (out) {
1177 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
1178 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
1179 xstrncat(&out_buffer, out, &out_len, (tmp-out));
1180 else
1181 xstrcat(&out_buffer, out, &out_len);
1182 }
1183 }
1184
1185 #define FOUND_SOMETHING() \
1186 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1187 found_rpath || found_needed || found_interp || found_bind || \
1188 found_soname || found_sym || found_lib || found_textrels || found_section )
1189
1190 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1191 xchrcat(&out_buffer, ' ', &out_len);
1192 xstrcat(&out_buffer, elf->filename, &out_len);
1193 }
1194 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
1195 puts(out_buffer);
1196 fflush(stdout);
1197 }
1198
1199 return 0;
1200 }
1201
1202 /* scan a single elf */
1203 static int scanelf_elf(const char *filename, int fd, size_t len)
1204 {
1205 int ret = 1;
1206 elfobj *elf;
1207
1208 /* verify this is real ELF */
1209 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1210 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1211 return ret;
1212 }
1213 switch (match_bits) {
1214 case 32:
1215 if (elf->elf_class != ELFCLASS32)
1216 goto label_done;
1217 break;
1218 case 64:
1219 if (elf->elf_class != ELFCLASS64)
1220 goto label_done;
1221 break;
1222 default: break;
1223 }
1224 if (strlen(match_etypes)) {
1225 char sbuf[126];
1226 strncpy(sbuf, match_etypes, sizeof(sbuf));
1227 if (strchr(match_etypes, ',') != NULL) {
1228 char *p;
1229 while((p = strrchr(sbuf, ',')) != NULL) {
1230 *p = 0;
1231 if (etype_lookup(p+1) == get_etype(elf))
1232 goto label_ret;
1233 }
1234 }
1235 if (etype_lookup(sbuf) != get_etype(elf))
1236 goto label_done;
1237 }
1238
1239 label_ret:
1240 ret = scanelf_elfobj(elf);
1241
1242 label_done:
1243 unreadelf(elf);
1244 return ret;
1245 }
1246
1247 /* scan an archive of elfs */
1248 static int scanelf_archive(const char *filename, int fd, size_t len)
1249 {
1250 archive_handle *ar;
1251 archive_member *m;
1252 char *ar_buffer;
1253 elfobj *elf;
1254
1255 ar = ar_open_fd(filename, fd);
1256 if (ar == NULL)
1257 return 1;
1258
1259 ar_buffer = (char*)mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1260 while ((m=ar_next(ar)) != NULL) {
1261 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size);
1262 if (elf) {
1263 scanelf_elfobj(elf);
1264 unreadelf(elf);
1265 }
1266 }
1267 munmap(ar_buffer, len);
1268
1269 return 0;
1270 }
1271 /* scan a file which may be an elf or an archive or some other magical beast */
1272 static void scanelf_file(const char *filename)
1273 {
1274 struct stat st;
1275 int fd;
1276
1277 /* make sure 'filename' exists */
1278 if (lstat(filename, &st) == -1) {
1279 if (be_verbose > 2) printf("%s: does not exist\n", filename);
1280 return;
1281 }
1282
1283 /* always handle regular files and handle symlinked files if no -y */
1284 if (S_ISLNK(st.st_mode)) {
1285 if (!scan_symlink) return;
1286 stat(filename, &st);
1287 }
1288 if (!S_ISREG(st.st_mode)) {
1289 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1290 return;
1291 }
1292
1293 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1294 return;
1295
1296 if (scanelf_elf(filename, fd, st.st_size) == 1 && scan_archives)
1297 /* if it isn't an ELF, maybe it's an .a archive */
1298 scanelf_archive(filename, fd, st.st_size);
1299
1300 close(fd);
1301 }
1302
1303 /* scan a directory for ET_EXEC files and print when we find one */
1304 static void scanelf_dir(const char *path)
1305 {
1306 register DIR *dir;
1307 register struct dirent *dentry;
1308 struct stat st_top, st;
1309 char buf[__PAX_UTILS_PATH_MAX];
1310 size_t pathlen = 0, len = 0;
1311
1312 /* make sure path exists */
1313 if (lstat(path, &st_top) == -1) {
1314 if (be_verbose > 2) printf("%s: does not exist\n", path);
1315 return;
1316 }
1317
1318 /* ok, if it isn't a directory, assume we can open it */
1319 if (!S_ISDIR(st_top.st_mode)) {
1320 scanelf_file(path);
1321 return;
1322 }
1323
1324 /* now scan the dir looking for fun stuff */
1325 if ((dir = opendir(path)) == NULL) {
1326 warnf("could not opendir %s: %s", path, strerror(errno));
1327 return;
1328 }
1329 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1330
1331 pathlen = strlen(path);
1332 while ((dentry = readdir(dir))) {
1333 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1334 continue;
1335 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
1336 if (len >= sizeof(buf)) {
1337 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1338 (unsigned long)len, (unsigned long)sizeof(buf));
1339 continue;
1340 }
1341 snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name);
1342 if (lstat(buf, &st) != -1) {
1343 if (S_ISREG(st.st_mode))
1344 scanelf_file(buf);
1345 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1346 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1347 scanelf_dir(buf);
1348 }
1349 }
1350 }
1351 closedir(dir);
1352 }
1353
1354 static int scanelf_from_file(const char *filename)
1355 {
1356 FILE *fp = NULL;
1357 char *p;
1358 char path[__PAX_UTILS_PATH_MAX];
1359
1360 if (strcmp(filename, "-") == 0)
1361 fp = stdin;
1362 else if ((fp = fopen(filename, "r")) == NULL)
1363 return 1;
1364
1365 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1366 if ((p = strchr(path, '\n')) != NULL)
1367 *p = 0;
1368 search_path = path;
1369 scanelf_dir(path);
1370 }
1371 if (fp != stdin)
1372 fclose(fp);
1373 return 0;
1374 }
1375
1376 #if defined(__GLIBC__) || defined(__UCLIBC__)
1377
1378 static int load_ld_cache_config(int i, const char *fname)
1379 {
1380 FILE *fp = NULL;
1381 char *p;
1382 char path[__PAX_UTILS_PATH_MAX];
1383
1384 if (i + 1 == ARRAY_SIZE(ldpaths))
1385 return i;
1386
1387 if ((fp = fopen(fname, "r")) == NULL)
1388 return i;
1389
1390 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1391 if ((p = strrchr(path, '\r')) != NULL)
1392 *p = 0;
1393 if ((p = strchr(path, '\n')) != NULL)
1394 *p = 0;
1395 // recursive includes of the same file will make this segfault.
1396 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1397 glob64_t gl;
1398 size_t x;
1399 char gpath[__PAX_UTILS_PATH_MAX];
1400
1401 memset(gpath, 0, sizeof(gpath));
1402
1403 if (path[8] != '/')
1404 snprintf(gpath, sizeof(gpath), "/etc/%s", &path[8]);
1405 else
1406 strncpy(gpath, &path[8], sizeof(gpath));
1407
1408 if ((glob64(gpath, 0, NULL, &gl)) == 0) {
1409 for (x = 0; x < gl.gl_pathc; ++x) {
1410 /* try to avoid direct loops */
1411 if (strcmp(gl.gl_pathv[x], fname) == 0)
1412 continue;
1413 i = load_ld_cache_config(i, gl.gl_pathv[x]);
1414 if (i + 1 >= ARRAY_SIZE(ldpaths)) {
1415 globfree64(&gl);
1416 return i;
1417 }
1418 }
1419 globfree64 (&gl);
1420 continue;
1421 } else
1422 abort();
1423 }
1424 if (*path != '/')
1425 continue;
1426
1427 ldpaths[i++] = xstrdup(path);
1428
1429 if (i + 1 == ARRAY_SIZE(ldpaths))
1430 break;
1431 }
1432 ldpaths[i] = NULL;
1433
1434 fclose(fp);
1435 return i;
1436 }
1437
1438 #elif defined(__FreeBSD__) || (__DragonFly__)
1439
1440 static int load_ld_cache_config(int i, const char *fname)
1441 {
1442 FILE *fp = NULL;
1443 char *b = NULL, *p;
1444 struct elfhints_hdr hdr;
1445
1446 if (i + 1 == ARRAY_SIZE(ldpaths))
1447 return i;
1448
1449 if ((fp = fopen(fname, "r")) == NULL)
1450 return i;
1451
1452 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1453 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1454 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1455 {
1456 fclose(fp);
1457 return i;
1458 }
1459
1460 b = (char*)malloc(hdr.dirlistlen+1);
1461 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1462 fclose(fp);
1463 free(b);
1464 return i;
1465 }
1466
1467 while ((p = strsep(&b, ":"))) {
1468 if (*p == '\0') continue;
1469 ldpaths[i++] = xstrdup(p);
1470
1471 if (i + 1 == ARRAY_SIZE(ldpaths))
1472 break;
1473 }
1474 ldpaths[i] = NULL;
1475
1476 free(b);
1477 fclose(fp);
1478 return i;
1479 }
1480
1481 #else
1482
1483 #warning Cache config support not implemented for your target
1484 static int load_ld_cache_config(int i, const char *fname)
1485 {
1486 memset(ldpaths, 0x00, sizeof(ldpaths));
1487 }
1488
1489 #endif
1490
1491 /* scan /etc/ld.so.conf for paths */
1492 static void scanelf_ldpath()
1493 {
1494 char scan_l, scan_ul, scan_ull;
1495 int i = 0;
1496
1497 if (!ldpaths[0])
1498 err("Unable to load any paths from ld.so.conf");
1499
1500 scan_l = scan_ul = scan_ull = 0;
1501
1502 while (ldpaths[i]) {
1503 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
1504 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
1505 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
1506 scanelf_dir(ldpaths[i]);
1507 ++i;
1508 }
1509
1510 if (!scan_l) scanelf_dir("/lib");
1511 if (!scan_ul) scanelf_dir("/usr/lib");
1512 if (!scan_ull) scanelf_dir("/usr/local/lib");
1513 }
1514
1515 /* scan env PATH for paths */
1516 static void scanelf_envpath()
1517 {
1518 char *path, *p;
1519
1520 path = getenv("PATH");
1521 if (!path)
1522 err("PATH is not set in your env !");
1523 path = xstrdup(path);
1524
1525 while ((p = strrchr(path, ':')) != NULL) {
1526 scanelf_dir(p + 1);
1527 *p = 0;
1528 }
1529
1530 free(path);
1531 }
1532
1533 /* usage / invocation handling functions */
1534 #define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:BhV"
1535 #define a_argument required_argument
1536 static struct option const long_opts[] = {
1537 {"path", no_argument, NULL, 'p'},
1538 {"ldpath", no_argument, NULL, 'l'},
1539 {"recursive", no_argument, NULL, 'R'},
1540 {"mount", no_argument, NULL, 'm'},
1541 {"symlink", no_argument, NULL, 'y'},
1542 {"archives", no_argument, NULL, 'A'},
1543 {"ldcache", no_argument, NULL, 'L'},
1544 {"fix", no_argument, NULL, 'X'},
1545 {"setpax", a_argument, NULL, 'z'},
1546 {"pax", no_argument, NULL, 'x'},
1547 {"header", no_argument, NULL, 'e'},
1548 {"textrel", no_argument, NULL, 't'},
1549 {"rpath", no_argument, NULL, 'r'},
1550 {"needed", no_argument, NULL, 'n'},
1551 {"interp", no_argument, NULL, 'i'},
1552 {"bind", no_argument, NULL, 'b'},
1553 {"soname", no_argument, NULL, 'S'},
1554 {"symbol", a_argument, NULL, 's'},
1555 {"section", a_argument, NULL, 'k'},
1556 {"lib", a_argument, NULL, 'N'},
1557 {"gmatch", no_argument, NULL, 'g'},
1558 {"textrels", no_argument, NULL, 'T'},
1559 {"etype", a_argument, NULL, 'E'},
1560 {"bits", a_argument, NULL, 'M'},
1561 {"all", no_argument, NULL, 'a'},
1562 {"quiet", no_argument, NULL, 'q'},
1563 {"verbose", no_argument, NULL, 'v'},
1564 {"format", a_argument, NULL, 'F'},
1565 {"from", a_argument, NULL, 'f'},
1566 {"file", a_argument, NULL, 'o'},
1567 {"nobanner", no_argument, NULL, 'B'},
1568 {"help", no_argument, NULL, 'h'},
1569 {"version", no_argument, NULL, 'V'},
1570 {NULL, no_argument, NULL, 0x0}
1571 };
1572
1573 static const char *opts_help[] = {
1574 "Scan all directories in PATH environment",
1575 "Scan all directories in /etc/ld.so.conf",
1576 "Scan directories recursively",
1577 "Don't recursively cross mount points",
1578 "Don't scan symlinks",
1579 "Scan archives (.a files)",
1580 "Utilize ld.so.cache information (use with -r/-n)",
1581 "Try and 'fix' bad things (use with -r/-e)",
1582 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1583 "Print PaX markings",
1584 "Print GNU_STACK/PT_LOAD markings",
1585 "Print TEXTREL information",
1586 "Print RPATH information",
1587 "Print NEEDED information",
1588 "Print INTERP information",
1589 "Print BIND information",
1590 "Print SONAME information",
1591 "Find a specified symbol",
1592 "Find a specified section",
1593 "Find a specified library",
1594 "Use strncmp to match libraries. (use with -N)",
1595 "Locate cause of TEXTREL",
1596 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1597 "Print only ELF files matching numeric bits",
1598 "Print all scanned info (-x -e -t -r -b)\n",
1599 "Only output 'bad' things",
1600 "Be verbose (can be specified more than once)",
1601 "Use specified format for output",
1602 "Read input stream from a filename",
1603 "Write output stream to a filename",
1604 "Don't display the header",
1605 "Print this help and exit",
1606 "Print version and exit",
1607 NULL
1608 };
1609
1610 /* display usage and exit */
1611 static void usage(int status)
1612 {
1613 unsigned long i;
1614 printf("* Scan ELF binaries for stuff\n\n"
1615 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1616 printf("Options: -[%s]\n", PARSE_FLAGS);
1617 for (i = 0; long_opts[i].name; ++i)
1618 if (long_opts[i].has_arg == no_argument)
1619 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
1620 long_opts[i].name, opts_help[i]);
1621 else
1622 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
1623 long_opts[i].name, opts_help[i]);
1624
1625 if (status != EXIT_SUCCESS)
1626 exit(status);
1627
1628 puts("\nThe format modifiers for the -F option are:");
1629 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1630 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1631 puts(" i INTERP \tb BIND \ts symbol");
1632 puts(" N library \to Type \tT TEXTRELs");
1633 puts(" S SONAME \tk section");
1634 puts(" p filename (with search path removed)");
1635 puts(" f filename (short name/basename)");
1636 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1637
1638 puts("\nELF Etypes:");
1639 print_etypes(stdout);
1640
1641 exit(status);
1642 }
1643
1644 /* parse command line arguments and preform needed actions */
1645 static void parseargs(int argc, char *argv[])
1646 {
1647 int i;
1648 const char *from_file = NULL;
1649
1650 opterr = 0;
1651 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1652 switch (i) {
1653
1654 case 'V':
1655 printf("pax-utils-%s: %s compiled %s\n%s\n"
1656 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
1657 VERSION, __FILE__, __DATE__, rcsid, argv0);
1658 exit(EXIT_SUCCESS);
1659 break;
1660 case 'h': usage(EXIT_SUCCESS); break;
1661 case 'f':
1662 if (from_file) warn("You prob don't want to specify -f twice");
1663 from_file = optarg;
1664 break;
1665 case 'E':
1666 strncpy(match_etypes, optarg, sizeof(match_etypes));
1667 break;
1668 case 'M':
1669 match_bits = atoi(optarg);
1670 break;
1671 case 'o': {
1672 if (freopen(optarg, "w", stdout) == NULL)
1673 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1674 break;
1675 }
1676 case 'k':
1677 if (find_section) warn("You prob don't want to specify -k twice");
1678 find_section = optarg;
1679 break;
1680 case 's': {
1681 if (find_sym) warn("You prob don't want to specify -s twice");
1682 find_sym = optarg;
1683 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1684 sprintf(versioned_symname, "%s@", find_sym);
1685 break;
1686 }
1687 case 'N': {
1688 if (find_lib) warn("You prob don't want to specify -N twice");
1689 find_lib = optarg;
1690 break;
1691 }
1692
1693 case 'F': {
1694 if (out_format) warn("You prob don't want to specify -F twice");
1695 out_format = optarg;
1696 break;
1697 }
1698 case 'z': {
1699 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1700 size_t x;
1701
1702 for (x = 0 ; x < strlen(optarg); x++) {
1703 switch(optarg[x]) {
1704 case 'p':
1705 case 'P':
1706 do_state(optarg[x], PAGEEXEC);
1707 break;
1708 case 's':
1709 case 'S':
1710 do_state(optarg[x], SEGMEXEC);
1711 break;
1712 case 'm':
1713 case 'M':
1714 do_state(optarg[x], MPROTECT);
1715 break;
1716 case 'e':
1717 case 'E':
1718 do_state(optarg[x], EMUTRAMP);
1719 break;
1720 case 'r':
1721 case 'R':
1722 do_state(optarg[x], RANDMMAP);
1723 break;
1724 case 'x':
1725 case 'X':
1726 do_state(optarg[x], RANDEXEC);
1727 break;
1728 default:
1729 break;
1730 }
1731 }
1732 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
1733 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
1734 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
1735 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
1736 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1737 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1738 setpax = flags;
1739 break;
1740 }
1741 case 'g': gmatch = 1; break;
1742 case 'L': use_ldcache = 1; break;
1743 case 'y': scan_symlink = 0; break;
1744 case 'A': scan_archives = 1; break;
1745 case 'B': show_banner = 0; break;
1746 case 'l': scan_ldpath = 1; break;
1747 case 'p': scan_envpath = 1; break;
1748 case 'R': dir_recurse = 1; break;
1749 case 'm': dir_crossmount = 0; break;
1750 case 'X': ++fix_elf; break;
1751 case 'x': show_pax = 1; break;
1752 case 'e': show_phdr = 1; break;
1753 case 't': show_textrel = 1; break;
1754 case 'r': show_rpath = 1; break;
1755 case 'n': show_needed = 1; break;
1756 case 'i': show_interp = 1; break;
1757 case 'b': show_bind = 1; break;
1758 case 'S': show_soname = 1; break;
1759 case 'T': show_textrels = 1; break;
1760 case 'q': be_quiet = 1; break;
1761 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1762 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
1763
1764 case ':':
1765 err("Option '%c' is missing parameter", optopt);
1766 case '?':
1767 err("Unknown option '%c' or argument missing", optopt);
1768 default:
1769 err("Unhandled option '%c'; please report this", i);
1770 }
1771 }
1772
1773 /* let the format option override all other options */
1774 if (out_format) {
1775 show_pax = show_phdr = show_textrel = show_rpath = \
1776 show_needed = show_interp = show_bind = show_soname = \
1777 show_textrels = 0;
1778 for (i = 0; out_format[i]; ++i) {
1779 if (!IS_MODIFIER(out_format[i])) continue;
1780
1781 switch (out_format[++i]) {
1782 case '+': break;
1783 case '%': break;
1784 case '#': break;
1785 case 'F': break;
1786 case 'p': break;
1787 case 'f': break;
1788 case 'k': break;
1789 case 's': break;
1790 case 'N': break;
1791 case 'o': break;
1792 case 'x': show_pax = 1; break;
1793 case 'e': show_phdr = 1; break;
1794 case 't': show_textrel = 1; break;
1795 case 'r': show_rpath = 1; break;
1796 case 'n': show_needed = 1; break;
1797 case 'i': show_interp = 1; break;
1798 case 'b': show_bind = 1; break;
1799 case 'S': show_soname = 1; break;
1800 case 'T': show_textrels = 1; break;
1801 default:
1802 err("Invalid format specifier '%c' (byte %i)",
1803 out_format[i], i+1);
1804 }
1805 }
1806
1807 /* construct our default format */
1808 } else {
1809 size_t fmt_len = 30;
1810 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
1811 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1812 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1813 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1814 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1815 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1816 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1817 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1818 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1819 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1820 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1821 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1822 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1823 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1824 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1825 }
1826 if (be_verbose > 2) printf("Format: %s\n", out_format);
1827
1828 /* now lets actually do the scanning */
1829 if (scan_ldpath || use_ldcache)
1830 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
1831 if (scan_ldpath) scanelf_ldpath();
1832 if (scan_envpath) scanelf_envpath();
1833 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
1834 from_file = "-";
1835 if (from_file) {
1836 scanelf_from_file(from_file);
1837 from_file = *argv;
1838 }
1839 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1840 err("Nothing to scan !?");
1841 while (optind < argc) {
1842 search_path = argv[optind++];
1843 scanelf_dir(search_path);
1844 }
1845
1846 /* clean up */
1847 free(versioned_symname);
1848 for (i = 0; ldpaths[i]; ++i)
1849 free(ldpaths[i]);
1850
1851 if (ldcache != 0)
1852 munmap(ldcache, ldcache_size);
1853 }
1854
1855 static char **get_split_env(const char *envvar)
1856 {
1857 const char *delims = " \t\n";
1858 char **envvals = NULL;
1859 char *env, *s;
1860 int nentry;
1861
1862 if ((env = getenv(envvar)) == NULL)
1863 return NULL;
1864
1865 env = xstrdup(env);
1866 if (env == NULL)
1867 return NULL;
1868
1869 s = strtok(env, delims);
1870 if (s == NULL) {
1871 free(env);
1872 return NULL;
1873 }
1874
1875 nentry = 0;
1876 while (s != NULL) {
1877 ++nentry;
1878 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
1879 envvals[nentry-1] = s;
1880 s = strtok(NULL, delims);
1881 }
1882 envvals[nentry] = NULL;
1883
1884 /* don't want to free(env) as it contains the memory that backs
1885 * the envvals array of strings */
1886 return envvals;
1887 }
1888 static void parseenv()
1889 {
1890 qa_textrels = get_split_env("QA_TEXTRELS");
1891 qa_execstack = get_split_env("QA_EXECSTACK");
1892 qa_wx_load = get_split_env("QA_WX_LOAD");
1893 }
1894 #ifdef __PAX_UTILS_CLEANUP
1895 static void cleanup()
1896 {
1897 free(out_format);
1898 free(qa_textrels);
1899 free(qa_execstack);
1900 free(qa_wx_load);
1901 }
1902 #endif
1903
1904
1905
1906 int main(int argc, char *argv[])
1907 {
1908 if (argc < 2)
1909 usage(EXIT_FAILURE);
1910 parseenv();
1911 parseargs(argc, argv);
1912 fclose(stdout);
1913 #ifdef __PAX_UTILS_CLEANUP
1914 cleanup();
1915 warn("The calls to add/delete heap should be off:\n"
1916 "\t- 1 due to the out_buffer not being freed in scanelf_file()\n"
1917 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
1918 #endif
1919 return EXIT_SUCCESS;
1920 }

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