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Revision 1.147 - (show annotations) (download) (as text)
Sun May 14 21:07:39 2006 UTC (8 years, 1 month ago) by vapier
Branch: MAIN
Changes since 1.146: +2 -8 lines
File MIME type: text/x-csrc
move porting-specific stuff to porting.h

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 1.146 2006/05/14 21:04:25 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 1.146 2006/05/14 21:04:25 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 char **file;
136 char *match;
137 char buf[__PAX_UTILS_PATH_MAX];
138
139 if (matchlist == NULL)
140 return 0;
141
142 for (file = matchlist; *file != NULL; file++) {
143 if (search_path) {
144 snprintf(buf,__PAX_UTILS_PATH_MAX, "%s%s", search_path, *file);
145 match=buf;
146 } else {
147 match=*file;
148 }
149 if (fnmatch(match, filename, 0) == 0)
150 return 1; /* TRUE */
151 }
152 return 0; /* FALSE */
153 }
154
155 /* sub-funcs for scanelf_file() */
156 static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
157 {
158 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
159 #define GET_SYMTABS(B) \
160 if (elf->elf_class == ELFCLASS ## B) { \
161 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
162 /* debug sections */ \
163 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
164 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
165 /* runtime sections */ \
166 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
167 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
168 if (symtab && dynsym) { \
169 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \
170 } else { \
171 *sym = (void*)(symtab ? symtab : dynsym); \
172 } \
173 if (strtab && dynstr) { \
174 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \
175 } else { \
176 *tab = (void*)(strtab ? strtab : dynstr); \
177 } \
178 }
179 GET_SYMTABS(32)
180 GET_SYMTABS(64)
181 }
182
183 static char *scanelf_file_pax(elfobj *elf, char *found_pax)
184 {
185 static char ret[7];
186 unsigned long i, shown;
187
188 if (!show_pax) return NULL;
189
190 shown = 0;
191 memset(&ret, 0, sizeof(ret));
192
193 if (elf->phdr) {
194 #define SHOW_PAX(B) \
195 if (elf->elf_class == ELFCLASS ## B) { \
196 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
197 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
198 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
199 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
200 continue; \
201 if (fix_elf && setpax) { \
202 /* set the paxctl flags */ \
203 ESET(phdr[i].p_flags, setpax); \
204 } \
205 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
206 continue; \
207 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
208 *found_pax = 1; \
209 ++shown; \
210 break; \
211 } \
212 }
213 SHOW_PAX(32)
214 SHOW_PAX(64)
215 }
216
217
218 if (fix_elf && setpax) {
219 /* set the chpax settings */
220 if (elf->elf_class == ELFCLASS32) {
221 if (EHDR32(elf->ehdr)->e_type == ET_DYN || EHDR32(elf->ehdr)->e_type == ET_EXEC)
222 ESET(EHDR32(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
223 } else {
224 if (EHDR64(elf->ehdr)->e_type == ET_DYN || EHDR64(elf->ehdr)->e_type == ET_EXEC)
225 ESET(EHDR64(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
226 }
227 }
228
229 /* fall back to EI_PAX if no PT_PAX was found */
230 if (!*ret) {
231 static char *paxflags;
232 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
233 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
234 *found_pax = 1;
235 return (be_wewy_wewy_quiet ? NULL : paxflags);
236 }
237 strncpy(ret, paxflags, sizeof(ret));
238 }
239
240 if (be_wewy_wewy_quiet || (be_quiet && !shown))
241 return NULL;
242 else
243 return ret;
244 }
245
246 static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
247 {
248 static char ret[12];
249 char *found;
250 unsigned long i, shown, multi_stack, multi_relro, multi_load;
251 int max_pt_load;
252
253 if (!show_phdr) return NULL;
254
255 memcpy(ret, "--- --- ---\0", 12);
256
257 shown = 0;
258 multi_stack = multi_relro = multi_load = 0;
259 max_pt_load = elf_max_pt_load(elf);
260
261 #define NOTE_GNU_STACK ".note.GNU-stack"
262 #define SHOW_PHDR(B) \
263 if (elf->elf_class == ELFCLASS ## B) { \
264 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
265 Elf ## B ## _Off offset; \
266 uint32_t flags, check_flags; \
267 if (elf->phdr != NULL) { \
268 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
269 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
270 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
271 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
272 if (!file_matches_list(elf->filename, qa_execstack)) {\
273 found = found_phdr; \
274 offset = 0; \
275 check_flags = PF_X; \
276 } else continue; \
277 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
278 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
279 found = found_relro; \
280 offset = 4; \
281 check_flags = PF_X; \
282 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
283 if (ehdr->e_type == ET_DYN || ehdr->e_type == ET_EXEC) \
284 if (multi_load++ > max_pt_load) warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
285 if (!file_matches_list(elf->filename, qa_wx_load)) {\
286 found = found_load; \
287 offset = 8; \
288 check_flags = PF_W|PF_X; \
289 } else continue; \
290 } else \
291 continue; \
292 flags = EGET(phdr[i].p_flags); \
293 if (be_quiet && ((flags & check_flags) != check_flags)) \
294 continue; \
295 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
296 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
297 ret[3] = ret[7] = '!'; \
298 flags = EGET(phdr[i].p_flags); \
299 } \
300 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
301 *found = 1; \
302 ++shown; \
303 } \
304 } else if (elf->shdr != NULL) { \
305 /* no program headers which means this is prob an object file */ \
306 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
307 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
308 char *str; \
309 if ((void*)strtbl > (void*)elf->data_end) \
310 goto skip_this_shdr##B; \
311 check_flags = SHF_WRITE|SHF_EXECINSTR; \
312 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
313 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
314 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
315 str = elf->data + offset; \
316 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
317 if (!strcmp(str, NOTE_GNU_STACK)) { \
318 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
319 flags = EGET(shdr[i].sh_flags); \
320 if (be_quiet && ((flags & check_flags) != check_flags)) \
321 continue; \
322 ++*found_phdr; \
323 shown = 1; \
324 if (flags & SHF_WRITE) ret[0] = 'W'; \
325 if (flags & SHF_ALLOC) ret[1] = 'A'; \
326 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
327 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
328 break; \
329 } \
330 } \
331 skip_this_shdr##B: \
332 if (!multi_stack) { \
333 *found_phdr = 1; \
334 shown = 1; \
335 memcpy(ret, "!WX", 3); \
336 } \
337 } \
338 }
339 SHOW_PHDR(32)
340 SHOW_PHDR(64)
341
342 if (be_wewy_wewy_quiet || (be_quiet && !shown))
343 return NULL;
344 else
345 return ret;
346 }
347
348 static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
349 {
350 static const char *ret = "TEXTREL";
351 unsigned long i;
352
353 if (!show_textrel && !show_textrels) return NULL;
354
355 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
356
357 if (elf->phdr) {
358 #define SHOW_TEXTREL(B) \
359 if (elf->elf_class == ELFCLASS ## B) { \
360 Elf ## B ## _Dyn *dyn; \
361 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
362 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
363 Elf ## B ## _Off offset; \
364 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
365 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
366 offset = EGET(phdr[i].p_offset); \
367 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
368 dyn = DYN ## B (elf->data + offset); \
369 while (EGET(dyn->d_tag) != DT_NULL) { \
370 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
371 *found_textrel = 1; \
372 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
373 return (be_wewy_wewy_quiet ? NULL : ret); \
374 } \
375 ++dyn; \
376 } \
377 } }
378 SHOW_TEXTREL(32)
379 SHOW_TEXTREL(64)
380 }
381
382 if (be_quiet || be_wewy_wewy_quiet)
383 return NULL;
384 else
385 return " - ";
386 }
387 static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
388 {
389 unsigned long s, r, rmax;
390 void *symtab_void, *strtab_void, *text_void;
391
392 if (!show_textrels) return NULL;
393
394 /* don't search for TEXTREL's if the ELF doesn't have any */
395 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
396 if (!*found_textrel) return NULL;
397
398 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
399 text_void = elf_findsecbyname(elf, ".text");
400
401 if (symtab_void && strtab_void && text_void && elf->shdr) {
402 #define SHOW_TEXTRELS(B) \
403 if (elf->elf_class == ELFCLASS ## B) { \
404 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
405 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
406 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
407 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
408 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
409 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
410 uint ## B ## _t memsz = EGET(text->sh_size); \
411 Elf ## B ## _Rel *rel; \
412 Elf ## B ## _Rela *rela; \
413 /* search the section headers for relocations */ \
414 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
415 uint32_t sh_type = EGET(shdr[s].sh_type); \
416 if (sh_type == SHT_REL) { \
417 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \
418 rela = NULL; \
419 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
420 } else if (sh_type == SHT_RELA) { \
421 rel = NULL; \
422 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \
423 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
424 } else \
425 continue; \
426 /* now see if any of the relocs are in the .text */ \
427 for (r = 0; r < rmax; ++r) { \
428 unsigned long sym_max; \
429 Elf ## B ## _Addr offset_tmp; \
430 Elf ## B ## _Sym *func; \
431 Elf ## B ## _Sym *sym; \
432 Elf ## B ## _Addr r_offset; \
433 uint ## B ## _t r_info; \
434 if (sh_type == SHT_REL) { \
435 r_offset = EGET(rel[r].r_offset); \
436 r_info = EGET(rel[r].r_info); \
437 } else { \
438 r_offset = EGET(rela[r].r_offset); \
439 r_info = EGET(rela[r].r_info); \
440 } \
441 /* make sure this relocation is inside of the .text */ \
442 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
443 if (be_verbose <= 2) continue; \
444 } else \
445 *found_textrels = 1; \
446 /* locate this relocation symbol name */ \
447 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
448 if ((void*)sym > (void*)elf->data_end) { \
449 warn("%s: corrupt ELF symbol", elf->filename); \
450 continue; \
451 } \
452 sym_max = ELF ## B ## _R_SYM(r_info); \
453 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
454 sym += sym_max; \
455 else \
456 sym = NULL; \
457 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
458 /* show the raw details about this reloc */ \
459 printf(" %s: ", elf->base_filename); \
460 if (sym && sym->st_name) \
461 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \
462 else \
463 printf("(memory/fake?)"); \
464 printf(" [0x%lX]", (unsigned long)r_offset); \
465 /* now try to find the closest symbol that this rel is probably in */ \
466 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
467 func = NULL; \
468 offset_tmp = 0; \
469 while (sym_max--) { \
470 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
471 func = sym; \
472 offset_tmp = EGET(sym->st_value); \
473 } \
474 ++sym; \
475 } \
476 printf(" in "); \
477 if (func && func->st_name) \
478 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \
479 else \
480 printf("(NULL: fake?)"); \
481 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
482 } \
483 } }
484 SHOW_TEXTRELS(32)
485 SHOW_TEXTRELS(64)
486 }
487 if (!*found_textrels)
488 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
489
490 return NULL;
491 }
492
493 static void rpath_security_checks(elfobj *, char *, const char *);
494 static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
495 {
496 struct stat st;
497 switch (*item) {
498 case '/': break;
499 case '.':
500 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
501 break;
502 case ':':
503 case '\0':
504 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
505 break;
506 case '$':
507 if (fstat(elf->fd, &st) != -1)
508 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
509 warnf("Security problem with %s='%s' in %s with mode set of %o",
510 dt_type, item, elf->filename, st.st_mode & 07777);
511 break;
512 default:
513 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
514 break;
515 }
516 }
517 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
518 {
519 unsigned long i, s;
520 char *rpath, *runpath, **r;
521 void *strtbl_void;
522
523 if (!show_rpath) return;
524
525 strtbl_void = elf_findsecbyname(elf, ".dynstr");
526 rpath = runpath = NULL;
527
528 if (elf->phdr && strtbl_void) {
529 #define SHOW_RPATH(B) \
530 if (elf->elf_class == ELFCLASS ## B) { \
531 Elf ## B ## _Dyn *dyn; \
532 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
533 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
534 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
535 Elf ## B ## _Off offset; \
536 Elf ## B ## _Xword word; \
537 /* Scan all the program headers */ \
538 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
539 /* Just scan dynamic headers */ \
540 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
541 offset = EGET(phdr[i].p_offset); \
542 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
543 /* Just scan dynamic RPATH/RUNPATH headers */ \
544 dyn = DYN ## B (elf->data + offset); \
545 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
546 if (word == DT_RPATH) { \
547 r = &rpath; \
548 } else if (word == DT_RUNPATH) { \
549 r = &runpath; \
550 } else { \
551 ++dyn; \
552 continue; \
553 } \
554 /* Verify the memory is somewhat sane */ \
555 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
556 if (offset < (Elf ## B ## _Off)elf->len) { \
557 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
558 *r = (char*)(elf->data + offset); \
559 /* cache the length in case we need to nuke this section later on */ \
560 if (fix_elf) \
561 offset = strlen(*r); \
562 /* If quiet, don't output paths in ld.so.conf */ \
563 if (be_quiet) { \
564 size_t len; \
565 char *start, *end; \
566 /* note that we only 'chop' off leading known paths. */ \
567 /* since *r is read-only memory, we can only move the ptr forward. */ \
568 start = *r; \
569 /* scan each path in : delimited list */ \
570 while (start) { \
571 rpath_security_checks(elf, start, get_elfdtype(word)); \
572 end = strchr(start, ':'); \
573 len = (end ? abs(end - start) : strlen(start)); \
574 if (use_ldcache) \
575 for (s = 0; ldpaths[s]; ++s) \
576 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
577 *r = end; \
578 /* corner case ... if RPATH reads "/usr/lib:", we want \
579 * to show ':' rather than '' */ \
580 if (end && end[1] != '\0') \
581 (*r)++; \
582 break; \
583 } \
584 if (!*r || !end) \
585 break; \
586 else \
587 start = start + len + 1; \
588 } \
589 } \
590 if (*r) { \
591 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
592 /* just nuke it */ \
593 nuke_it##B: \
594 memset(*r, 0x00, offset); \
595 *r = NULL; \
596 ESET(dyn->d_tag, DT_DEBUG); \
597 ESET(dyn->d_un.d_ptr, 0); \
598 } else if (fix_elf) { \
599 /* try to clean "bad" paths */ \
600 size_t len, tmpdir_len; \
601 char *start, *end; \
602 const char *tmpdir; \
603 start = *r; \
604 tmpdir = (getenv("TMPDIR") ? : "."); \
605 tmpdir_len = strlen(tmpdir); \
606 while (1) { \
607 end = strchr(start, ':'); \
608 if (start == end) { \
609 eat_this_path##B: \
610 len = strlen(end); \
611 memmove(start, end+1, len); \
612 start[len-1] = '\0'; \
613 end = start - 1; \
614 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
615 if (!end) { \
616 if (start == *r) \
617 goto nuke_it##B; \
618 *--start = '\0'; \
619 } else \
620 goto eat_this_path##B; \
621 } \
622 if (!end) \
623 break; \
624 start = end + 1; \
625 } \
626 if (**r == '\0') \
627 goto nuke_it##B; \
628 } \
629 if (*r) \
630 *found_rpath = 1; \
631 } \
632 } \
633 ++dyn; \
634 } \
635 } }
636 SHOW_RPATH(32)
637 SHOW_RPATH(64)
638 }
639
640 if (be_wewy_wewy_quiet) return;
641
642 if (rpath && runpath) {
643 if (!strcmp(rpath, runpath)) {
644 xstrcat(ret, runpath, ret_len);
645 } else {
646 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
647 xchrcat(ret, '{', ret_len);
648 xstrcat(ret, rpath, ret_len);
649 xchrcat(ret, ',', ret_len);
650 xstrcat(ret, runpath, ret_len);
651 xchrcat(ret, '}', ret_len);
652 }
653 } else if (rpath || runpath)
654 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
655 else if (!be_quiet)
656 xstrcat(ret, " - ", ret_len);
657 }
658
659 #define LDSO_CACHE_MAGIC "ld.so-"
660 #define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
661 #define LDSO_CACHE_VER "1.7.0"
662 #define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
663 #define FLAG_ANY -1
664 #define FLAG_TYPE_MASK 0x00ff
665 #define FLAG_LIBC4 0x0000
666 #define FLAG_ELF 0x0001
667 #define FLAG_ELF_LIBC5 0x0002
668 #define FLAG_ELF_LIBC6 0x0003
669 #define FLAG_REQUIRED_MASK 0xff00
670 #define FLAG_SPARC_LIB64 0x0100
671 #define FLAG_IA64_LIB64 0x0200
672 #define FLAG_X8664_LIB64 0x0300
673 #define FLAG_S390_LIB64 0x0400
674 #define FLAG_POWERPC_LIB64 0x0500
675 #define FLAG_MIPS64_LIBN32 0x0600
676 #define FLAG_MIPS64_LIBN64 0x0700
677
678 static char *lookup_cache_lib(elfobj *, char *);
679 #if defined(__GLIBC__) || defined(__UCLIBC__)
680 static char *lookup_cache_lib(elfobj *elf, char *fname)
681 {
682 int fd = 0;
683 char *strs;
684 static char buf[__PAX_UTILS_PATH_MAX] = "";
685 const char *cachefile = "/etc/ld.so.cache";
686 struct stat st;
687
688 typedef struct {
689 char magic[LDSO_CACHE_MAGIC_LEN];
690 char version[LDSO_CACHE_VER_LEN];
691 int nlibs;
692 } header_t;
693 header_t *header;
694
695 typedef struct {
696 int flags;
697 int sooffset;
698 int liboffset;
699 } libentry_t;
700 libentry_t *libent;
701
702 if (fname == NULL)
703 return NULL;
704
705 if (ldcache == 0) {
706 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1)
707 return NULL;
708
709 /* cache these values so we only map/unmap the cache file once */
710 ldcache_size = st.st_size;
711 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
712
713 close(fd);
714
715 if (ldcache == (caddr_t)-1) {
716 ldcache = 0;
717 return NULL;
718 }
719
720 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
721 return NULL;
722 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
723 return NULL;
724 }
725
726 header = (header_t *) ldcache;
727 libent = (libentry_t *) (ldcache + sizeof(header_t));
728 strs = (char *) &libent[header->nlibs];
729
730 for (fd = 0; fd < header->nlibs; fd++) {
731 /* this should be more fine grained, but for now we assume that
732 * diff arches will not be cached together. and we ignore the
733 * the different multilib mips cases. */
734 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
735 continue;
736 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
737 continue;
738
739 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
740 continue;
741 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
742 }
743 return buf;
744 }
745 #else
746 #warning Cache support not implemented for your current target.
747 static char *lookup_cache_lib(elfobj *elf, char *fname)
748 {
749 return NULL;
750 }
751 #endif
752
753 static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
754 {
755 unsigned long i;
756 char *needed;
757 void *strtbl_void;
758 char *p;
759
760 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
761
762 strtbl_void = elf_findsecbyname(elf, ".dynstr");
763
764 if (elf->phdr && strtbl_void) {
765 #define SHOW_NEEDED(B) \
766 if (elf->elf_class == ELFCLASS ## B) { \
767 Elf ## B ## _Dyn *dyn; \
768 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
769 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
770 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
771 Elf ## B ## _Off offset; \
772 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
773 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
774 offset = EGET(phdr[i].p_offset); \
775 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
776 dyn = DYN ## B (elf->data + offset); \
777 while (EGET(dyn->d_tag) != DT_NULL) { \
778 if (EGET(dyn->d_tag) == DT_NEEDED) { \
779 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
780 if (offset >= (Elf ## B ## _Off)elf->len) { \
781 ++dyn; \
782 continue; \
783 } \
784 needed = (char*)(elf->data + offset); \
785 if (op == 0) { \
786 if (!be_wewy_wewy_quiet) { \
787 if (*found_needed) xchrcat(ret, ',', ret_len); \
788 if (use_ldcache) \
789 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
790 needed = p; \
791 xstrcat(ret, needed, ret_len); \
792 } \
793 *found_needed = 1; \
794 } else { \
795 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \
796 *found_lib = 1; \
797 return (be_wewy_wewy_quiet ? NULL : needed); \
798 } \
799 } \
800 } \
801 ++dyn; \
802 } \
803 } }
804 SHOW_NEEDED(32)
805 SHOW_NEEDED(64)
806 if (op == 0 && !*found_needed && be_verbose)
807 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
808 }
809
810 return NULL;
811 }
812 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
813 {
814 void *strtbl_void;
815
816 if (!show_interp) return NULL;
817
818 strtbl_void = elf_findsecbyname(elf, ".interp");
819
820 if (strtbl_void) {
821 #define SHOW_INTERP(B) \
822 if (elf->elf_class == ELFCLASS ## B) { \
823 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
824 *found_interp = 1; \
825 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
826 }
827 SHOW_INTERP(32)
828 SHOW_INTERP(64)
829 }
830 return NULL;
831 }
832 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
833 {
834 unsigned long i;
835 struct stat s;
836 char dynamic = 0;
837
838 if (!show_bind) return NULL;
839 if (!elf->phdr) return NULL;
840
841 #define SHOW_BIND(B) \
842 if (elf->elf_class == ELFCLASS ## B) { \
843 Elf ## B ## _Dyn *dyn; \
844 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
845 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
846 Elf ## B ## _Off offset; \
847 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
848 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
849 dynamic = 1; \
850 offset = EGET(phdr[i].p_offset); \
851 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
852 dyn = DYN ## B (elf->data + offset); \
853 while (EGET(dyn->d_tag) != DT_NULL) { \
854 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
855 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
856 { \
857 if (be_quiet) return NULL; \
858 *found_bind = 1; \
859 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
860 } \
861 ++dyn; \
862 } \
863 } \
864 }
865 SHOW_BIND(32)
866 SHOW_BIND(64)
867
868 if (be_wewy_wewy_quiet) return NULL;
869
870 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) {
871 return NULL;
872 } else {
873 *found_bind = 1;
874 return (char *) (dynamic ? "LAZY" : "STATIC");
875 }
876 }
877 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
878 {
879 unsigned long i;
880 char *soname;
881 void *strtbl_void;
882
883 if (!show_soname) return NULL;
884
885 strtbl_void = elf_findsecbyname(elf, ".dynstr");
886
887 if (elf->phdr && strtbl_void) {
888 #define SHOW_SONAME(B) \
889 if (elf->elf_class == ELFCLASS ## B) { \
890 Elf ## B ## _Dyn *dyn; \
891 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
892 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
893 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
894 Elf ## B ## _Off offset; \
895 /* only look for soname in shared objects */ \
896 if (ehdr->e_type != ET_DYN) \
897 return NULL; \
898 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
899 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
900 offset = EGET(phdr[i].p_offset); \
901 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
902 dyn = DYN ## B (elf->data + offset); \
903 while (EGET(dyn->d_tag) != DT_NULL) { \
904 if (EGET(dyn->d_tag) == DT_SONAME) { \
905 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
906 if (offset >= (Elf ## B ## _Off)elf->len) { \
907 ++dyn; \
908 continue; \
909 } \
910 soname = (char*)(elf->data + offset); \
911 *found_soname = 1; \
912 return (be_wewy_wewy_quiet ? NULL : soname); \
913 } \
914 ++dyn; \
915 } \
916 } }
917 SHOW_SONAME(32)
918 SHOW_SONAME(64)
919 }
920
921 return NULL;
922 }
923 static char *scanelf_file_sym(elfobj *elf, char *found_sym)
924 {
925 unsigned long i;
926 char *ret;
927 void *symtab_void, *strtab_void;
928
929 if (!find_sym) return NULL;
930 ret = find_sym;
931
932 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
933
934 if (symtab_void && strtab_void) {
935 #define FIND_SYM(B) \
936 if (elf->elf_class == ELFCLASS ## B) { \
937 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
938 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
939 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
940 unsigned long cnt = EGET(symtab->sh_entsize); \
941 char *symname; \
942 if (cnt) \
943 cnt = EGET(symtab->sh_size) / cnt; \
944 for (i = 0; i < cnt; ++i) { \
945 if (sym->st_name) { \
946 /* make sure the symbol name is in acceptable memory range */ \
947 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
948 if ((void*)symname > (void*)elf->data_end) { \
949 warnf("%s: corrupt ELF symbols", elf->filename); \
950 ++sym; \
951 continue; \
952 } \
953 /* debug display ... show all symbols and some extra info */ \
954 if (*ret == '*') { \
955 printf("%s(%s) %5lX %15s %s\n", \
956 ((*found_sym == 0) ? "\n\t" : "\t"), \
957 elf->base_filename, \
958 (unsigned long)sym->st_size, \
959 get_elfstttype(sym->st_info), \
960 symname); \
961 *found_sym = 1; \
962 } else { \
963 /* allow the user to specify a comma delimited list of symbols to search for */ \
964 char *this_sym, *next_sym; \
965 this_sym = ret; \
966 do { \
967 next_sym = strchr(this_sym, ','); \
968 if (next_sym == NULL) \
969 next_sym = this_sym + strlen(this_sym); \
970 /* do we want a defined symbol ? */ \
971 if (*this_sym == '+') { \
972 if (sym->st_shndx == SHN_UNDEF) \
973 goto skip_this_sym##B; \
974 ++this_sym; \
975 /* do we want an undefined symbol ? */ \
976 } else if (*this_sym == '-') { \
977 if (sym->st_shndx != SHN_UNDEF) \
978 goto skip_this_sym##B; \
979 ++this_sym; \
980 } \
981 /* ok, lets compare the name now */ \
982 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
983 (strncmp(symname, versioned_symname, strlen(versioned_symname)) == 0)) { \
984 if (be_semi_verbose) { \
985 char buf[126]; \
986 snprintf(buf, sizeof(buf), "%lX %s %s", \
987 (unsigned long)sym->st_size, get_elfstttype(sym->st_info), this_sym); \
988 ret = buf; \
989 } else \
990 ret = this_sym; \
991 (*found_sym)++; \
992 goto break_out; \
993 } \
994 skip_this_sym##B: this_sym = next_sym + 1; \
995 } while (*next_sym != '\0'); \
996 } \
997 } \
998 ++sym; \
999 } }
1000 FIND_SYM(32)
1001 FIND_SYM(64)
1002 }
1003
1004 break_out:
1005 if (be_wewy_wewy_quiet) return NULL;
1006
1007 if (*find_sym != '*' && *found_sym)
1008 return ret;
1009 if (be_quiet)
1010 return NULL;
1011 else
1012 return (char *)" - ";
1013 }
1014
1015
1016 static char *scanelf_file_sections(elfobj *elf, char *found_section)
1017 {
1018 if (!find_section)
1019 return NULL;
1020
1021 #define FIND_SECTION(B) \
1022 if (elf->elf_class == ELFCLASS ## B) { \
1023 int invert; \
1024 Elf ## B ## _Shdr *section; \
1025 invert = (*find_section == '!' ? 1 : 0); \
1026 section = SHDR ## B (elf_findsecbyname(elf, find_section+invert)); \
1027 if ((section == NULL && invert) || (section != NULL && !invert)) \
1028 *found_section = 1; \
1029 }
1030 FIND_SECTION(32)
1031 FIND_SECTION(64)
1032
1033 if (be_wewy_wewy_quiet)
1034 return NULL;
1035
1036 if (*found_section)
1037 return find_section;
1038
1039 if (be_quiet)
1040 return NULL;
1041 else
1042 return (char *)" - ";
1043 }
1044
1045 /* scan an elf file and show all the fun stuff */
1046 #define prints(str) write(fileno(stdout), str, strlen(str))
1047 static int scanelf_elfobj(elfobj *elf)
1048 {
1049 unsigned long i;
1050 char found_pax, found_phdr, found_relro, found_load, found_textrel,
1051 found_rpath, found_needed, found_interp, found_bind, found_soname,
1052 found_sym, found_lib, found_file, found_textrels, found_section;
1053 static char *out_buffer = NULL;
1054 static size_t out_len;
1055
1056 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 = 0;
1059
1060 if (be_verbose > 2)
1061 printf("%s: scanning file {%s,%s}\n", elf->filename,
1062 get_elfeitype(EI_CLASS, elf->elf_class),
1063 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
1064 else if (be_verbose > 1)
1065 printf("%s: scanning file\n", elf->filename);
1066
1067 /* init output buffer */
1068 if (!out_buffer) {
1069 out_len = sizeof(char) * 80;
1070 out_buffer = (char*)xmalloc(out_len);
1071 }
1072 *out_buffer = '\0';
1073
1074 /* show the header */
1075 if (!be_quiet && show_banner) {
1076 for (i = 0; out_format[i]; ++i) {
1077 if (!IS_MODIFIER(out_format[i])) continue;
1078
1079 switch (out_format[++i]) {
1080 case '+': break;
1081 case '%': break;
1082 case '#': break;
1083 case 'F':
1084 case 'p':
1085 case 'f': prints("FILE "); found_file = 1; break;
1086 case 'o': prints(" TYPE "); break;
1087 case 'x': prints(" PAX "); break;
1088 case 'e': prints("STK/REL/PTL "); break;
1089 case 't': prints("TEXTREL "); break;
1090 case 'r': prints("RPATH "); break;
1091 case 'n': prints("NEEDED "); break;
1092 case 'i': prints("INTERP "); break;
1093 case 'b': prints("BIND "); break;
1094 case 'S': prints("SONAME "); break;
1095 case 's': prints("SYM "); break;
1096 case 'N': prints("LIB "); break;
1097 case 'T': prints("TEXTRELS "); break;
1098 case 'k': prints("SECTION "); break;
1099 default: warnf("'%c' has no title ?", out_format[i]);
1100 }
1101 }
1102 if (!found_file) prints("FILE ");
1103 prints("\n");
1104 found_file = 0;
1105 show_banner = 0;
1106 }
1107
1108 /* dump all the good stuff */
1109 for (i = 0; out_format[i]; ++i) {
1110 const char *out;
1111 const char *tmp;
1112
1113 if (!IS_MODIFIER(out_format[i])) {
1114 xchrcat(&out_buffer, out_format[i], &out_len);
1115 continue;
1116 }
1117
1118 out = NULL;
1119 be_wewy_wewy_quiet = (out_format[i] == '#');
1120 be_semi_verbose = (out_format[i] == '+');
1121 switch (out_format[++i]) {
1122 case '+':
1123 case '%':
1124 case '#':
1125 xchrcat(&out_buffer, out_format[i], &out_len); break;
1126 case 'F':
1127 found_file = 1;
1128 if (be_wewy_wewy_quiet) break;
1129 xstrcat(&out_buffer, elf->filename, &out_len);
1130 break;
1131 case 'p':
1132 found_file = 1;
1133 if (be_wewy_wewy_quiet) break;
1134 tmp = elf->filename;
1135 if (search_path) {
1136 ssize_t len_search = strlen(search_path);
1137 ssize_t len_file = strlen(elf->filename);
1138 if (!strncmp(elf->filename, search_path, len_search) && \
1139 len_file > len_search)
1140 tmp += len_search;
1141 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1142 }
1143 xstrcat(&out_buffer, tmp, &out_len);
1144 break;
1145 case 'f':
1146 found_file = 1;
1147 if (be_wewy_wewy_quiet) break;
1148 tmp = strrchr(elf->filename, '/');
1149 tmp = (tmp == NULL ? elf->filename : tmp+1);
1150 xstrcat(&out_buffer, tmp, &out_len);
1151 break;
1152 case 'o': out = get_elfetype(elf); break;
1153 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
1154 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
1155 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1156 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
1157 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1158 case 'n':
1159 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
1160 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1161 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1162 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
1163 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1164 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1165 default: warnf("'%c' has no scan code?", out_format[i]);
1166 }
1167 if (out) {
1168 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
1169 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
1170 xstrncat(&out_buffer, out, &out_len, (tmp-out));
1171 else
1172 xstrcat(&out_buffer, out, &out_len);
1173 }
1174 }
1175
1176 #define FOUND_SOMETHING() \
1177 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1178 found_rpath || found_needed || found_interp || found_bind || \
1179 found_soname || found_sym || found_lib || found_textrels || found_section )
1180
1181 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1182 xchrcat(&out_buffer, ' ', &out_len);
1183 xstrcat(&out_buffer, elf->filename, &out_len);
1184 }
1185 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
1186 puts(out_buffer);
1187 fflush(stdout);
1188 }
1189
1190 return 0;
1191 }
1192
1193 /* scan a single elf */
1194 static int scanelf_elf(const char *filename, int fd, size_t len)
1195 {
1196 int ret = 1;
1197 elfobj *elf;
1198
1199 /* verify this is real ELF */
1200 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1201 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1202 return ret;
1203 }
1204 switch (match_bits) {
1205 case 32:
1206 if (elf->elf_class != ELFCLASS32)
1207 goto label_done;
1208 break;
1209 case 64:
1210 if (elf->elf_class != ELFCLASS64)
1211 goto label_done;
1212 break;
1213 default: break;
1214 }
1215 if (strlen(match_etypes)) {
1216 char sbuf[126];
1217 strncpy(sbuf, match_etypes, sizeof(sbuf));
1218 if (strchr(match_etypes, ',') != NULL) {
1219 char *p;
1220 while((p = strrchr(sbuf, ',')) != NULL) {
1221 *p = 0;
1222 if (etype_lookup(p+1) == get_etype(elf))
1223 goto label_ret;
1224 }
1225 }
1226 if (etype_lookup(sbuf) != get_etype(elf))
1227 goto label_done;
1228 }
1229
1230 label_ret:
1231 ret = scanelf_elfobj(elf);
1232
1233 label_done:
1234 unreadelf(elf);
1235 return ret;
1236 }
1237
1238 /* scan an archive of elfs */
1239 static int scanelf_archive(const char *filename, int fd, size_t len)
1240 {
1241 archive_handle *ar;
1242 archive_member *m;
1243 char *ar_buffer;
1244 elfobj *elf;
1245
1246 ar = ar_open_fd(filename, fd);
1247 if (ar == NULL)
1248 return 1;
1249
1250 ar_buffer = (char*)mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1251 while ((m=ar_next(ar)) != NULL) {
1252 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size);
1253 if (elf) {
1254 scanelf_elfobj(elf);
1255 unreadelf(elf);
1256 }
1257 }
1258 munmap(ar_buffer, len);
1259
1260 return 0;
1261 }
1262 /* scan a file which may be an elf or an archive or some other magical beast */
1263 static void scanelf_file(const char *filename)
1264 {
1265 struct stat st;
1266 int fd;
1267
1268 /* make sure 'filename' exists */
1269 if (lstat(filename, &st) == -1) {
1270 if (be_verbose > 2) printf("%s: does not exist\n", filename);
1271 return;
1272 }
1273
1274 /* always handle regular files and handle symlinked files if no -y */
1275 if (S_ISLNK(st.st_mode)) {
1276 if (!scan_symlink) return;
1277 stat(filename, &st);
1278 }
1279 if (!S_ISREG(st.st_mode)) {
1280 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1281 return;
1282 }
1283
1284 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1285 return;
1286
1287 if (scanelf_elf(filename, fd, st.st_size) == 1 && scan_archives)
1288 /* if it isn't an ELF, maybe it's an .a archive */
1289 scanelf_archive(filename, fd, st.st_size);
1290
1291 close(fd);
1292 }
1293
1294 /* scan a directory for ET_EXEC files and print when we find one */
1295 static void scanelf_dir(const char *path)
1296 {
1297 register DIR *dir;
1298 register struct dirent *dentry;
1299 struct stat st_top, st;
1300 char buf[__PAX_UTILS_PATH_MAX];
1301 size_t pathlen = 0, len = 0;
1302
1303 /* make sure path exists */
1304 if (lstat(path, &st_top) == -1) {
1305 if (be_verbose > 2) printf("%s: does not exist\n", path);
1306 return;
1307 }
1308
1309 /* ok, if it isn't a directory, assume we can open it */
1310 if (!S_ISDIR(st_top.st_mode)) {
1311 scanelf_file(path);
1312 return;
1313 }
1314
1315 /* now scan the dir looking for fun stuff */
1316 if ((dir = opendir(path)) == NULL) {
1317 warnf("could not opendir %s: %s", path, strerror(errno));
1318 return;
1319 }
1320 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1321
1322 pathlen = strlen(path);
1323 while ((dentry = readdir(dir))) {
1324 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1325 continue;
1326 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
1327 if (len >= sizeof(buf)) {
1328 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1329 (unsigned long)len, (unsigned long)sizeof(buf));
1330 continue;
1331 }
1332 snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name);
1333 if (lstat(buf, &st) != -1) {
1334 if (S_ISREG(st.st_mode))
1335 scanelf_file(buf);
1336 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1337 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1338 scanelf_dir(buf);
1339 }
1340 }
1341 }
1342 closedir(dir);
1343 }
1344
1345 static int scanelf_from_file(const char *filename)
1346 {
1347 FILE *fp = NULL;
1348 char *p;
1349 char path[__PAX_UTILS_PATH_MAX];
1350
1351 if (strcmp(filename, "-") == 0)
1352 fp = stdin;
1353 else if ((fp = fopen(filename, "r")) == NULL)
1354 return 1;
1355
1356 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1357 if ((p = strchr(path, '\n')) != NULL)
1358 *p = 0;
1359 search_path = path;
1360 scanelf_dir(path);
1361 }
1362 if (fp != stdin)
1363 fclose(fp);
1364 return 0;
1365 }
1366
1367 #if defined(__GLIBC__) || defined(__UCLIBC__)
1368 static int load_ld_so_conf(int i, const char *fname)
1369 {
1370 FILE *fp = NULL;
1371 char *p;
1372 char path[__PAX_UTILS_PATH_MAX];
1373
1374 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
1375 return i;
1376
1377 if ((fp = fopen(fname, "r")) == NULL)
1378 return i;
1379
1380 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1381 if ((p = strrchr(path, '\r')) != NULL)
1382 *p = 0;
1383 if ((p = strchr(path, '\n')) != NULL)
1384 *p = 0;
1385 // recursive includes of the same file will make this segfault.
1386 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1387 glob64_t gl;
1388 size_t x;
1389 char gpath[__PAX_UTILS_PATH_MAX];
1390
1391 memset(gpath, 0, sizeof(gpath));
1392
1393 if (path[8] != '/')
1394 snprintf(gpath, sizeof(gpath), "/etc/%s", &path[8]);
1395 else
1396 strncpy(gpath, &path[8], sizeof(gpath));
1397
1398 if ((glob64(gpath, 0, NULL, &gl)) == 0) {
1399 for (x = 0; x < gl.gl_pathc; ++x) {
1400 /* try to avoid direct loops */
1401 if (strcmp(gl.gl_pathv[x], fname) == 0)
1402 continue;
1403 i = load_ld_so_conf(i, gl.gl_pathv[x]);
1404 if (i + 1 >= sizeof(ldpaths) / sizeof(*ldpaths)) {
1405 globfree64(&gl);
1406 return i;
1407 }
1408 }
1409 globfree64 (&gl);
1410 continue;
1411 } else
1412 abort();
1413 }
1414 if (*path != '/')
1415 continue;
1416
1417 ldpaths[i++] = xstrdup(path);
1418
1419 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
1420 break;
1421 }
1422 ldpaths[i] = NULL;
1423
1424 fclose(fp);
1425 return i;
1426 }
1427 #endif
1428
1429 #if defined(__FreeBSD__) || (__DragonFly__)
1430 static int load_ld_so_hints(int i, const char *fname)
1431 {
1432 FILE *fp = NULL;
1433 char *b = NULL, *p;
1434 struct elfhints_hdr hdr;
1435
1436 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
1437 return i;
1438
1439 if ((fp = fopen(fname, "r")) == NULL)
1440 return i;
1441
1442 if ( fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1443 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1444 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1
1445 ) {
1446 fclose(fp);
1447 return i;
1448 }
1449
1450 b = (char*)malloc(hdr.dirlistlen+1);
1451 if ( fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1 ) {
1452 fclose(fp);
1453 free(b);
1454 return i;
1455 }
1456
1457 while ( (p = strsep(&b, ":")) ) {
1458 if ( *p == '\0' ) continue;
1459 ldpaths[i++] = xstrdup(p);
1460
1461 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
1462 break;
1463 }
1464 ldpaths[i] = NULL;
1465
1466 free(b);
1467 fclose(fp);
1468 return i;
1469 }
1470 #endif
1471
1472 /* scan /etc/ld.so.conf for paths */
1473 static void scanelf_ldpath()
1474 {
1475 char scan_l, scan_ul, scan_ull;
1476 int i = 0;
1477
1478 if (!ldpaths[0])
1479 err("Unable to load any paths from ld.so.conf");
1480
1481 scan_l = scan_ul = scan_ull = 0;
1482
1483 while (ldpaths[i]) {
1484 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
1485 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
1486 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
1487 scanelf_dir(ldpaths[i]);
1488 ++i;
1489 }
1490
1491 if (!scan_l) scanelf_dir("/lib");
1492 if (!scan_ul) scanelf_dir("/usr/lib");
1493 if (!scan_ull) scanelf_dir("/usr/local/lib");
1494 }
1495
1496 /* scan env PATH for paths */
1497 static void scanelf_envpath()
1498 {
1499 char *path, *p;
1500
1501 path = getenv("PATH");
1502 if (!path)
1503 err("PATH is not set in your env !");
1504 path = xstrdup(path);
1505
1506 while ((p = strrchr(path, ':')) != NULL) {
1507 scanelf_dir(p + 1);
1508 *p = 0;
1509 }
1510
1511 free(path);
1512 }
1513
1514 /* usage / invocation handling functions */
1515 #define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:BhV"
1516 #define a_argument required_argument
1517 static struct option const long_opts[] = {
1518 {"path", no_argument, NULL, 'p'},
1519 {"ldpath", no_argument, NULL, 'l'},
1520 {"recursive", no_argument, NULL, 'R'},
1521 {"mount", no_argument, NULL, 'm'},
1522 {"symlink", no_argument, NULL, 'y'},
1523 {"archives", no_argument, NULL, 'A'},
1524 {"ldcache", no_argument, NULL, 'L'},
1525 {"fix", no_argument, NULL, 'X'},
1526 {"setpax", a_argument, NULL, 'z'},
1527 {"pax", no_argument, NULL, 'x'},
1528 {"header", no_argument, NULL, 'e'},
1529 {"textrel", no_argument, NULL, 't'},
1530 {"rpath", no_argument, NULL, 'r'},
1531 {"needed", no_argument, NULL, 'n'},
1532 {"interp", no_argument, NULL, 'i'},
1533 {"bind", no_argument, NULL, 'b'},
1534 {"soname", no_argument, NULL, 'S'},
1535 {"symbol", a_argument, NULL, 's'},
1536 {"section", a_argument, NULL, 'k'},
1537 {"lib", a_argument, NULL, 'N'},
1538 {"gmatch", no_argument, NULL, 'g'},
1539 {"textrels", no_argument, NULL, 'T'},
1540 {"etype", a_argument, NULL, 'E'},
1541 {"bits", a_argument, NULL, 'M'},
1542 {"all", no_argument, NULL, 'a'},
1543 {"quiet", no_argument, NULL, 'q'},
1544 {"verbose", no_argument, NULL, 'v'},
1545 {"format", a_argument, NULL, 'F'},
1546 {"from", a_argument, NULL, 'f'},
1547 {"file", a_argument, NULL, 'o'},
1548 {"nobanner", no_argument, NULL, 'B'},
1549 {"help", no_argument, NULL, 'h'},
1550 {"version", no_argument, NULL, 'V'},
1551 {NULL, no_argument, NULL, 0x0}
1552 };
1553
1554 static const char *opts_help[] = {
1555 "Scan all directories in PATH environment",
1556 "Scan all directories in /etc/ld.so.conf",
1557 "Scan directories recursively",
1558 "Don't recursively cross mount points",
1559 "Don't scan symlinks",
1560 "Scan archives (.a files)",
1561 "Utilize ld.so.cache information (use with -r/-n)",
1562 "Try and 'fix' bad things (use with -r/-e)",
1563 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1564 "Print PaX markings",
1565 "Print GNU_STACK/PT_LOAD markings",
1566 "Print TEXTREL information",
1567 "Print RPATH information",
1568 "Print NEEDED information",
1569 "Print INTERP information",
1570 "Print BIND information",
1571 "Print SONAME information",
1572 "Find a specified symbol",
1573 "Find a specified section",
1574 "Find a specified library",
1575 "Use strncmp to match libraries. (use with -N)",
1576 "Locate cause of TEXTREL",
1577 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1578 "Print only ELF files matching numeric bits",
1579 "Print all scanned info (-x -e -t -r -b)\n",
1580 "Only output 'bad' things",
1581 "Be verbose (can be specified more than once)",
1582 "Use specified format for output",
1583 "Read input stream from a filename",
1584 "Write output stream to a filename",
1585 "Don't display the header",
1586 "Print this help and exit",
1587 "Print version and exit",
1588 NULL
1589 };
1590
1591 /* display usage and exit */
1592 static void usage(int status)
1593 {
1594 unsigned long i;
1595 printf("* Scan ELF binaries for stuff\n\n"
1596 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1597 printf("Options: -[%s]\n", PARSE_FLAGS);
1598 for (i = 0; long_opts[i].name; ++i)
1599 if (long_opts[i].has_arg == no_argument)
1600 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
1601 long_opts[i].name, opts_help[i]);
1602 else
1603 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
1604 long_opts[i].name, opts_help[i]);
1605
1606 if (status != EXIT_SUCCESS)
1607 exit(status);
1608
1609 puts("\nThe format modifiers for the -F option are:");
1610 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1611 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1612 puts(" i INTERP \tb BIND \ts symbol");
1613 puts(" N library \to Type \tT TEXTRELs");
1614 puts(" S SONAME \tk section");
1615 puts(" p filename (with search path removed)");
1616 puts(" f filename (short name/basename)");
1617 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1618
1619 puts("\nELF Etypes:");
1620 print_etypes(stdout);
1621
1622 exit(status);
1623 }
1624
1625 /* parse command line arguments and preform needed actions */
1626 static void parseargs(int argc, char *argv[])
1627 {
1628 int i;
1629 const char *from_file = NULL;
1630
1631 opterr = 0;
1632 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1633 switch (i) {
1634
1635 case 'V':
1636 printf("pax-utils-%s: %s compiled %s\n%s\n"
1637 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
1638 VERSION, __FILE__, __DATE__, rcsid, argv0);
1639 exit(EXIT_SUCCESS);
1640 break;
1641 case 'h': usage(EXIT_SUCCESS); break;
1642 case 'f':
1643 if (from_file) warn("You prob don't want to specify -f twice");
1644 from_file = optarg;
1645 break;
1646 case 'E':
1647 strncpy(match_etypes, optarg, sizeof(match_etypes));
1648 break;
1649 case 'M':
1650 match_bits = atoi(optarg);
1651 break;
1652 case 'o': {
1653 if (freopen(optarg, "w", stdout) == NULL)
1654 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1655 break;
1656 }
1657 case 'k':
1658 if (find_section) warn("You prob don't want to specify -k twice");
1659 find_section = optarg;
1660 break;
1661 case 's': {
1662 if (find_sym) warn("You prob don't want to specify -s twice");
1663 find_sym = optarg;
1664 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1665 sprintf(versioned_symname, "%s@", find_sym);
1666 break;
1667 }
1668 case 'N': {
1669 if (find_lib) warn("You prob don't want to specify -N twice");
1670 find_lib = optarg;
1671 break;
1672 }
1673
1674 case 'F': {
1675 if (out_format) warn("You prob don't want to specify -F twice");
1676 out_format = optarg;
1677 break;
1678 }
1679 case 'z': {
1680 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1681 size_t x;
1682
1683 for (x = 0 ; x < strlen(optarg); x++) {
1684 switch(optarg[x]) {
1685 case 'p':
1686 case 'P':
1687 do_state(optarg[x], PAGEEXEC);
1688 break;
1689 case 's':
1690 case 'S':
1691 do_state(optarg[x], SEGMEXEC);
1692 break;
1693 case 'm':
1694 case 'M':
1695 do_state(optarg[x], MPROTECT);
1696 break;
1697 case 'e':
1698 case 'E':
1699 do_state(optarg[x], EMUTRAMP);
1700 break;
1701 case 'r':
1702 case 'R':
1703 do_state(optarg[x], RANDMMAP);
1704 break;
1705 case 'x':
1706 case 'X':
1707 do_state(optarg[x], RANDEXEC);
1708 break;
1709 default:
1710 break;
1711 }
1712 }
1713 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
1714 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
1715 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
1716 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
1717 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1718 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1719 setpax = flags;
1720 break;
1721 }
1722 case 'g': gmatch = 1; break;
1723 case 'L': use_ldcache = 1; break;
1724 case 'y': scan_symlink = 0; break;
1725 case 'A': scan_archives = 1; break;
1726 case 'B': show_banner = 0; break;
1727 case 'l': scan_ldpath = 1; break;
1728 case 'p': scan_envpath = 1; break;
1729 case 'R': dir_recurse = 1; break;
1730 case 'm': dir_crossmount = 0; break;
1731 case 'X': ++fix_elf; break;
1732 case 'x': show_pax = 1; break;
1733 case 'e': show_phdr = 1; break;
1734 case 't': show_textrel = 1; break;
1735 case 'r': show_rpath = 1; break;
1736 case 'n': show_needed = 1; break;
1737 case 'i': show_interp = 1; break;
1738 case 'b': show_bind = 1; break;
1739 case 'S': show_soname = 1; break;
1740 case 'T': show_textrels = 1; break;
1741 case 'q': be_quiet = 1; break;
1742 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1743 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
1744
1745 case ':':
1746 err("Option '%c' is missing parameter", optopt);
1747 case '?':
1748 err("Unknown option '%c' or argument missing", optopt);
1749 default:
1750 err("Unhandled option '%c'; please report this", i);
1751 }
1752 }
1753
1754 /* let the format option override all other options */
1755 if (out_format) {
1756 show_pax = show_phdr = show_textrel = show_rpath = \
1757 show_needed = show_interp = show_bind = show_soname = \
1758 show_textrels = 0;
1759 for (i = 0; out_format[i]; ++i) {
1760 if (!IS_MODIFIER(out_format[i])) continue;
1761
1762 switch (out_format[++i]) {
1763 case '+': break;
1764 case '%': break;
1765 case '#': break;
1766 case 'F': break;
1767 case 'p': break;
1768 case 'f': break;
1769 case 'k': break;
1770 case 's': break;
1771 case 'N': break;
1772 case 'o': break;
1773 case 'x': show_pax = 1; break;
1774 case 'e': show_phdr = 1; break;
1775 case 't': show_textrel = 1; break;
1776 case 'r': show_rpath = 1; break;
1777 case 'n': show_needed = 1; break;
1778 case 'i': show_interp = 1; break;
1779 case 'b': show_bind = 1; break;
1780 case 'S': show_soname = 1; break;
1781 case 'T': show_textrels = 1; break;
1782 default:
1783 err("Invalid format specifier '%c' (byte %i)",
1784 out_format[i], i+1);
1785 }
1786 }
1787
1788 /* construct our default format */
1789 } else {
1790 size_t fmt_len = 30;
1791 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
1792 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1793 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1794 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1795 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1796 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1797 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1798 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1799 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1800 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1801 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1802 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1803 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1804 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1805 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1806 }
1807 if (be_verbose > 2) printf("Format: %s\n", out_format);
1808
1809 /* now lets actually do the scanning */
1810 if (scan_ldpath || use_ldcache)
1811 #if defined(__GLIBC__) || defined(__UCLIBC__)
1812 load_ld_so_conf(0, "/etc/ld.so.conf");
1813 #elif defined(__FreeBSD__) || defined(__DragonFly__)
1814 load_ld_so_hints(0, _PATH_ELF_HINTS);
1815 #endif
1816 if (scan_ldpath) scanelf_ldpath();
1817 if (scan_envpath) scanelf_envpath();
1818 if (!from_file && optind == argc && ttyname(0) == NULL)
1819 from_file = "-";
1820 if (from_file) {
1821 scanelf_from_file(from_file);
1822 from_file = *argv;
1823 }
1824 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1825 err("Nothing to scan !?");
1826 while (optind < argc) {
1827 search_path = argv[optind++];
1828 scanelf_dir(search_path);
1829 }
1830
1831 /* clean up */
1832 if (versioned_symname) free(versioned_symname);
1833 for (i = 0; ldpaths[i]; ++i)
1834 free(ldpaths[i]);
1835
1836 if (ldcache != 0)
1837 munmap(ldcache, ldcache_size);
1838 }
1839
1840 static char **get_split_env(const char *envvar) {
1841 char **envvals = NULL;
1842 char *saveptr = NULL;
1843 char *env;
1844 char *s;
1845 int nentry;
1846
1847 if ((env = getenv(envvar)) == NULL)
1848 return NULL;
1849
1850 env = xstrdup(env);
1851 if (env == NULL)
1852 return NULL;
1853
1854 nentry = 0;
1855 for (s = strtok_r(env, " \t\n", &saveptr); s != NULL; s = strtok_r(NULL, " \t\n", &saveptr)) {
1856 if ((envvals = xrealloc(envvals, sizeof(char *)*(nentry+1))) == NULL)
1857 return NULL;
1858 envvals[nentry++] = s;
1859 }
1860 envvals[nentry] = NULL;
1861
1862 return envvals;
1863 }
1864
1865 static void parseenv() {
1866 qa_textrels=get_split_env("QA_TEXTRELS");
1867 qa_execstack=get_split_env("QA_EXECSTACK");
1868 qa_wx_load=get_split_env("QA_WX_LOAD");
1869 }
1870
1871
1872
1873 int main(int argc, char *argv[])
1874 {
1875 if (argc < 2)
1876 usage(EXIT_FAILURE);
1877 parseenv();
1878 parseargs(argc, argv);
1879 fclose(stdout);
1880 #ifdef __BOUNDS_CHECKING_ON
1881 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()");
1882 #endif
1883 return EXIT_SUCCESS;
1884 }

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