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Revision 1.150 - (show annotations) (download) (as text)
Sun May 14 21:37:55 2006 UTC (8 years, 2 months ago) by vapier
Branch: MAIN
Changes since 1.149: +13 -10 lines
File MIME type: text/x-csrc
touchup style

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 1.149 2006/05/14 21:21:35 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 1.149 2006/05/14 21:21:35 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,__PAX_UTILS_PATH_MAX, "%s%s", search_path, *file);
146 match = buf;
147 } else {
148 match = *file;
149 }
150 if (fnmatch(match, filename, 0) == 0)
151 return 1; /* TRUE */
152 }
153 return 0; /* FALSE */
154 }
155
156 /* sub-funcs for scanelf_file() */
157 static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
158 {
159 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
160 #define GET_SYMTABS(B) \
161 if (elf->elf_class == ELFCLASS ## B) { \
162 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
163 /* debug sections */ \
164 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
165 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
166 /* runtime sections */ \
167 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
168 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
169 if (symtab && dynsym) { \
170 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \
171 } else { \
172 *sym = (void*)(symtab ? symtab : dynsym); \
173 } \
174 if (strtab && dynstr) { \
175 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \
176 } else { \
177 *tab = (void*)(strtab ? strtab : dynstr); \
178 } \
179 }
180 GET_SYMTABS(32)
181 GET_SYMTABS(64)
182 }
183
184 static char *scanelf_file_pax(elfobj *elf, char *found_pax)
185 {
186 static char ret[7];
187 unsigned long i, shown;
188
189 if (!show_pax) return NULL;
190
191 shown = 0;
192 memset(&ret, 0, sizeof(ret));
193
194 if (elf->phdr) {
195 #define SHOW_PAX(B) \
196 if (elf->elf_class == ELFCLASS ## B) { \
197 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
198 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
199 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
200 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
201 continue; \
202 if (fix_elf && setpax) { \
203 /* set the paxctl flags */ \
204 ESET(phdr[i].p_flags, setpax); \
205 } \
206 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
207 continue; \
208 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
209 *found_pax = 1; \
210 ++shown; \
211 break; \
212 } \
213 }
214 SHOW_PAX(32)
215 SHOW_PAX(64)
216 }
217
218
219 if (fix_elf && setpax) {
220 /* set the chpax settings */
221 if (elf->elf_class == ELFCLASS32) {
222 if (EHDR32(elf->ehdr)->e_type == ET_DYN || EHDR32(elf->ehdr)->e_type == ET_EXEC)
223 ESET(EHDR32(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
224 } else {
225 if (EHDR64(elf->ehdr)->e_type == ET_DYN || EHDR64(elf->ehdr)->e_type == ET_EXEC)
226 ESET(EHDR64(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
227 }
228 }
229
230 /* fall back to EI_PAX if no PT_PAX was found */
231 if (!*ret) {
232 static char *paxflags;
233 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
234 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
235 *found_pax = 1;
236 return (be_wewy_wewy_quiet ? NULL : paxflags);
237 }
238 strncpy(ret, paxflags, sizeof(ret));
239 }
240
241 if (be_wewy_wewy_quiet || (be_quiet && !shown))
242 return NULL;
243 else
244 return ret;
245 }
246
247 static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
248 {
249 static char ret[12];
250 char *found;
251 unsigned long i, shown, multi_stack, multi_relro, multi_load;
252 int max_pt_load;
253
254 if (!show_phdr) return NULL;
255
256 memcpy(ret, "--- --- ---\0", 12);
257
258 shown = 0;
259 multi_stack = multi_relro = multi_load = 0;
260 max_pt_load = elf_max_pt_load(elf);
261
262 #define NOTE_GNU_STACK ".note.GNU-stack"
263 #define SHOW_PHDR(B) \
264 if (elf->elf_class == ELFCLASS ## B) { \
265 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
266 Elf ## B ## _Off offset; \
267 uint32_t flags, check_flags; \
268 if (elf->phdr != NULL) { \
269 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
270 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
271 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
272 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
273 if (!file_matches_list(elf->filename, qa_execstack)) {\
274 found = found_phdr; \
275 offset = 0; \
276 check_flags = PF_X; \
277 } else continue; \
278 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
279 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
280 found = found_relro; \
281 offset = 4; \
282 check_flags = PF_X; \
283 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
284 if (ehdr->e_type == ET_DYN || ehdr->e_type == ET_EXEC) \
285 if (multi_load++ > max_pt_load) warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
286 if (!file_matches_list(elf->filename, qa_wx_load)) {\
287 found = found_load; \
288 offset = 8; \
289 check_flags = PF_W|PF_X; \
290 } else continue; \
291 } else \
292 continue; \
293 flags = EGET(phdr[i].p_flags); \
294 if (be_quiet && ((flags & check_flags) != check_flags)) \
295 continue; \
296 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
297 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
298 ret[3] = ret[7] = '!'; \
299 flags = EGET(phdr[i].p_flags); \
300 } \
301 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
302 *found = 1; \
303 ++shown; \
304 } \
305 } else if (elf->shdr != NULL) { \
306 /* no program headers which means this is prob an object file */ \
307 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
308 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
309 char *str; \
310 if ((void*)strtbl > (void*)elf->data_end) \
311 goto skip_this_shdr##B; \
312 check_flags = SHF_WRITE|SHF_EXECINSTR; \
313 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
314 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
315 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
316 str = elf->data + offset; \
317 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
318 if (!strcmp(str, NOTE_GNU_STACK)) { \
319 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
320 flags = EGET(shdr[i].sh_flags); \
321 if (be_quiet && ((flags & check_flags) != check_flags)) \
322 continue; \
323 ++*found_phdr; \
324 shown = 1; \
325 if (flags & SHF_WRITE) ret[0] = 'W'; \
326 if (flags & SHF_ALLOC) ret[1] = 'A'; \
327 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
328 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
329 break; \
330 } \
331 } \
332 skip_this_shdr##B: \
333 if (!multi_stack) { \
334 *found_phdr = 1; \
335 shown = 1; \
336 memcpy(ret, "!WX", 3); \
337 } \
338 } \
339 }
340 SHOW_PHDR(32)
341 SHOW_PHDR(64)
342
343 if (be_wewy_wewy_quiet || (be_quiet && !shown))
344 return NULL;
345 else
346 return ret;
347 }
348
349 static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
350 {
351 static const char *ret = "TEXTREL";
352 unsigned long i;
353
354 if (!show_textrel && !show_textrels) return NULL;
355
356 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
357
358 if (elf->phdr) {
359 #define SHOW_TEXTREL(B) \
360 if (elf->elf_class == ELFCLASS ## B) { \
361 Elf ## B ## _Dyn *dyn; \
362 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
363 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
364 Elf ## B ## _Off offset; \
365 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
366 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
367 offset = EGET(phdr[i].p_offset); \
368 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
369 dyn = DYN ## B (elf->data + offset); \
370 while (EGET(dyn->d_tag) != DT_NULL) { \
371 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
372 *found_textrel = 1; \
373 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
374 return (be_wewy_wewy_quiet ? NULL : ret); \
375 } \
376 ++dyn; \
377 } \
378 } }
379 SHOW_TEXTREL(32)
380 SHOW_TEXTREL(64)
381 }
382
383 if (be_quiet || be_wewy_wewy_quiet)
384 return NULL;
385 else
386 return " - ";
387 }
388 static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
389 {
390 unsigned long s, r, rmax;
391 void *symtab_void, *strtab_void, *text_void;
392
393 if (!show_textrels) return NULL;
394
395 /* don't search for TEXTREL's if the ELF doesn't have any */
396 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
397 if (!*found_textrel) return NULL;
398
399 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
400 text_void = elf_findsecbyname(elf, ".text");
401
402 if (symtab_void && strtab_void && text_void && elf->shdr) {
403 #define SHOW_TEXTRELS(B) \
404 if (elf->elf_class == ELFCLASS ## B) { \
405 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
406 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
407 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
408 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
409 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
410 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
411 uint ## B ## _t memsz = EGET(text->sh_size); \
412 Elf ## B ## _Rel *rel; \
413 Elf ## B ## _Rela *rela; \
414 /* search the section headers for relocations */ \
415 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
416 uint32_t sh_type = EGET(shdr[s].sh_type); \
417 if (sh_type == SHT_REL) { \
418 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \
419 rela = NULL; \
420 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
421 } else if (sh_type == SHT_RELA) { \
422 rel = NULL; \
423 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \
424 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
425 } else \
426 continue; \
427 /* now see if any of the relocs are in the .text */ \
428 for (r = 0; r < rmax; ++r) { \
429 unsigned long sym_max; \
430 Elf ## B ## _Addr offset_tmp; \
431 Elf ## B ## _Sym *func; \
432 Elf ## B ## _Sym *sym; \
433 Elf ## B ## _Addr r_offset; \
434 uint ## B ## _t r_info; \
435 if (sh_type == SHT_REL) { \
436 r_offset = EGET(rel[r].r_offset); \
437 r_info = EGET(rel[r].r_info); \
438 } else { \
439 r_offset = EGET(rela[r].r_offset); \
440 r_info = EGET(rela[r].r_info); \
441 } \
442 /* make sure this relocation is inside of the .text */ \
443 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
444 if (be_verbose <= 2) continue; \
445 } else \
446 *found_textrels = 1; \
447 /* locate this relocation symbol name */ \
448 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
449 if ((void*)sym > (void*)elf->data_end) { \
450 warn("%s: corrupt ELF symbol", elf->filename); \
451 continue; \
452 } \
453 sym_max = ELF ## B ## _R_SYM(r_info); \
454 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
455 sym += sym_max; \
456 else \
457 sym = NULL; \
458 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
459 /* show the raw details about this reloc */ \
460 printf(" %s: ", elf->base_filename); \
461 if (sym && sym->st_name) \
462 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \
463 else \
464 printf("(memory/fake?)"); \
465 printf(" [0x%lX]", (unsigned long)r_offset); \
466 /* now try to find the closest symbol that this rel is probably in */ \
467 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
468 func = NULL; \
469 offset_tmp = 0; \
470 while (sym_max--) { \
471 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
472 func = sym; \
473 offset_tmp = EGET(sym->st_value); \
474 } \
475 ++sym; \
476 } \
477 printf(" in "); \
478 if (func && func->st_name) \
479 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \
480 else \
481 printf("(NULL: fake?)"); \
482 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
483 } \
484 } }
485 SHOW_TEXTRELS(32)
486 SHOW_TEXTRELS(64)
487 }
488 if (!*found_textrels)
489 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
490
491 return NULL;
492 }
493
494 static void rpath_security_checks(elfobj *, char *, const char *);
495 static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
496 {
497 struct stat st;
498 switch (*item) {
499 case '/': break;
500 case '.':
501 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
502 break;
503 case ':':
504 case '\0':
505 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
506 break;
507 case '$':
508 if (fstat(elf->fd, &st) != -1)
509 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
510 warnf("Security problem with %s='%s' in %s with mode set of %o",
511 dt_type, item, elf->filename, st.st_mode & 07777);
512 break;
513 default:
514 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
515 break;
516 }
517 }
518 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
519 {
520 unsigned long i, s;
521 char *rpath, *runpath, **r;
522 void *strtbl_void;
523
524 if (!show_rpath) return;
525
526 strtbl_void = elf_findsecbyname(elf, ".dynstr");
527 rpath = runpath = NULL;
528
529 if (elf->phdr && strtbl_void) {
530 #define SHOW_RPATH(B) \
531 if (elf->elf_class == ELFCLASS ## B) { \
532 Elf ## B ## _Dyn *dyn; \
533 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
534 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
535 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
536 Elf ## B ## _Off offset; \
537 Elf ## B ## _Xword word; \
538 /* Scan all the program headers */ \
539 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
540 /* Just scan dynamic headers */ \
541 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
542 offset = EGET(phdr[i].p_offset); \
543 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
544 /* Just scan dynamic RPATH/RUNPATH headers */ \
545 dyn = DYN ## B (elf->data + offset); \
546 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
547 if (word == DT_RPATH) { \
548 r = &rpath; \
549 } else if (word == DT_RUNPATH) { \
550 r = &runpath; \
551 } else { \
552 ++dyn; \
553 continue; \
554 } \
555 /* Verify the memory is somewhat sane */ \
556 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
557 if (offset < (Elf ## B ## _Off)elf->len) { \
558 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
559 *r = (char*)(elf->data + offset); \
560 /* cache the length in case we need to nuke this section later on */ \
561 if (fix_elf) \
562 offset = strlen(*r); \
563 /* If quiet, don't output paths in ld.so.conf */ \
564 if (be_quiet) { \
565 size_t len; \
566 char *start, *end; \
567 /* note that we only 'chop' off leading known paths. */ \
568 /* since *r is read-only memory, we can only move the ptr forward. */ \
569 start = *r; \
570 /* scan each path in : delimited list */ \
571 while (start) { \
572 rpath_security_checks(elf, start, get_elfdtype(word)); \
573 end = strchr(start, ':'); \
574 len = (end ? abs(end - start) : strlen(start)); \
575 if (use_ldcache) \
576 for (s = 0; ldpaths[s]; ++s) \
577 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
578 *r = end; \
579 /* corner case ... if RPATH reads "/usr/lib:", we want \
580 * to show ':' rather than '' */ \
581 if (end && end[1] != '\0') \
582 (*r)++; \
583 break; \
584 } \
585 if (!*r || !end) \
586 break; \
587 else \
588 start = start + len + 1; \
589 } \
590 } \
591 if (*r) { \
592 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
593 /* just nuke it */ \
594 nuke_it##B: \
595 memset(*r, 0x00, offset); \
596 *r = NULL; \
597 ESET(dyn->d_tag, DT_DEBUG); \
598 ESET(dyn->d_un.d_ptr, 0); \
599 } else if (fix_elf) { \
600 /* try to clean "bad" paths */ \
601 size_t len, tmpdir_len; \
602 char *start, *end; \
603 const char *tmpdir; \
604 start = *r; \
605 tmpdir = (getenv("TMPDIR") ? : "."); \
606 tmpdir_len = strlen(tmpdir); \
607 while (1) { \
608 end = strchr(start, ':'); \
609 if (start == end) { \
610 eat_this_path##B: \
611 len = strlen(end); \
612 memmove(start, end+1, len); \
613 start[len-1] = '\0'; \
614 end = start - 1; \
615 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
616 if (!end) { \
617 if (start == *r) \
618 goto nuke_it##B; \
619 *--start = '\0'; \
620 } else \
621 goto eat_this_path##B; \
622 } \
623 if (!end) \
624 break; \
625 start = end + 1; \
626 } \
627 if (**r == '\0') \
628 goto nuke_it##B; \
629 } \
630 if (*r) \
631 *found_rpath = 1; \
632 } \
633 } \
634 ++dyn; \
635 } \
636 } }
637 SHOW_RPATH(32)
638 SHOW_RPATH(64)
639 }
640
641 if (be_wewy_wewy_quiet) return;
642
643 if (rpath && runpath) {
644 if (!strcmp(rpath, runpath)) {
645 xstrcat(ret, runpath, ret_len);
646 } else {
647 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
648 xchrcat(ret, '{', ret_len);
649 xstrcat(ret, rpath, ret_len);
650 xchrcat(ret, ',', ret_len);
651 xstrcat(ret, runpath, ret_len);
652 xchrcat(ret, '}', ret_len);
653 }
654 } else if (rpath || runpath)
655 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
656 else if (!be_quiet)
657 xstrcat(ret, " - ", ret_len);
658 }
659
660 #define LDSO_CACHE_MAGIC "ld.so-"
661 #define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
662 #define LDSO_CACHE_VER "1.7.0"
663 #define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
664 #define FLAG_ANY -1
665 #define FLAG_TYPE_MASK 0x00ff
666 #define FLAG_LIBC4 0x0000
667 #define FLAG_ELF 0x0001
668 #define FLAG_ELF_LIBC5 0x0002
669 #define FLAG_ELF_LIBC6 0x0003
670 #define FLAG_REQUIRED_MASK 0xff00
671 #define FLAG_SPARC_LIB64 0x0100
672 #define FLAG_IA64_LIB64 0x0200
673 #define FLAG_X8664_LIB64 0x0300
674 #define FLAG_S390_LIB64 0x0400
675 #define FLAG_POWERPC_LIB64 0x0500
676 #define FLAG_MIPS64_LIBN32 0x0600
677 #define FLAG_MIPS64_LIBN64 0x0700
678
679 static char *lookup_cache_lib(elfobj *, char *);
680
681 #if defined(__GLIBC__) || defined(__UCLIBC__)
682
683 static char *lookup_cache_lib(elfobj *elf, char *fname)
684 {
685 int fd = 0;
686 char *strs;
687 static char buf[__PAX_UTILS_PATH_MAX] = "";
688 const char *cachefile = "/etc/ld.so.cache";
689 struct stat st;
690
691 typedef struct {
692 char magic[LDSO_CACHE_MAGIC_LEN];
693 char version[LDSO_CACHE_VER_LEN];
694 int nlibs;
695 } header_t;
696 header_t *header;
697
698 typedef struct {
699 int flags;
700 int sooffset;
701 int liboffset;
702 } libentry_t;
703 libentry_t *libent;
704
705 if (fname == NULL)
706 return NULL;
707
708 if (ldcache == 0) {
709 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1)
710 return NULL;
711
712 /* cache these values so we only map/unmap the cache file once */
713 ldcache_size = st.st_size;
714 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
715
716 close(fd);
717
718 if (ldcache == (caddr_t)-1) {
719 ldcache = 0;
720 return NULL;
721 }
722
723 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
724 return NULL;
725 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
726 return NULL;
727 }
728
729 header = (header_t *) ldcache;
730 libent = (libentry_t *) (ldcache + sizeof(header_t));
731 strs = (char *) &libent[header->nlibs];
732
733 for (fd = 0; fd < header->nlibs; fd++) {
734 /* this should be more fine grained, but for now we assume that
735 * diff arches will not be cached together. and we ignore the
736 * the different multilib mips cases. */
737 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
738 continue;
739 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
740 continue;
741
742 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
743 continue;
744 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
745 }
746 return buf;
747 }
748
749 #else
750 #warning Cache support not implemented for your target
751 static char *lookup_cache_lib(elfobj *elf, char *fname)
752 {
753 return NULL;
754 }
755 #endif
756
757 static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
758 {
759 unsigned long i;
760 char *needed;
761 void *strtbl_void;
762 char *p;
763
764 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
765
766 strtbl_void = elf_findsecbyname(elf, ".dynstr");
767
768 if (elf->phdr && strtbl_void) {
769 #define SHOW_NEEDED(B) \
770 if (elf->elf_class == ELFCLASS ## B) { \
771 Elf ## B ## _Dyn *dyn; \
772 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
773 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
774 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
775 Elf ## B ## _Off offset; \
776 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
777 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
778 offset = EGET(phdr[i].p_offset); \
779 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
780 dyn = DYN ## B (elf->data + offset); \
781 while (EGET(dyn->d_tag) != DT_NULL) { \
782 if (EGET(dyn->d_tag) == DT_NEEDED) { \
783 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
784 if (offset >= (Elf ## B ## _Off)elf->len) { \
785 ++dyn; \
786 continue; \
787 } \
788 needed = (char*)(elf->data + offset); \
789 if (op == 0) { \
790 if (!be_wewy_wewy_quiet) { \
791 if (*found_needed) xchrcat(ret, ',', ret_len); \
792 if (use_ldcache) \
793 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
794 needed = p; \
795 xstrcat(ret, needed, ret_len); \
796 } \
797 *found_needed = 1; \
798 } else { \
799 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \
800 *found_lib = 1; \
801 return (be_wewy_wewy_quiet ? NULL : needed); \
802 } \
803 } \
804 } \
805 ++dyn; \
806 } \
807 } }
808 SHOW_NEEDED(32)
809 SHOW_NEEDED(64)
810 if (op == 0 && !*found_needed && be_verbose)
811 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
812 }
813
814 return NULL;
815 }
816 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
817 {
818 void *strtbl_void;
819
820 if (!show_interp) return NULL;
821
822 strtbl_void = elf_findsecbyname(elf, ".interp");
823
824 if (strtbl_void) {
825 #define SHOW_INTERP(B) \
826 if (elf->elf_class == ELFCLASS ## B) { \
827 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
828 *found_interp = 1; \
829 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
830 }
831 SHOW_INTERP(32)
832 SHOW_INTERP(64)
833 }
834 return NULL;
835 }
836 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
837 {
838 unsigned long i;
839 struct stat s;
840 char dynamic = 0;
841
842 if (!show_bind) return NULL;
843 if (!elf->phdr) return NULL;
844
845 #define SHOW_BIND(B) \
846 if (elf->elf_class == ELFCLASS ## B) { \
847 Elf ## B ## _Dyn *dyn; \
848 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
849 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
850 Elf ## B ## _Off offset; \
851 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
852 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
853 dynamic = 1; \
854 offset = EGET(phdr[i].p_offset); \
855 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
856 dyn = DYN ## B (elf->data + offset); \
857 while (EGET(dyn->d_tag) != DT_NULL) { \
858 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
859 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
860 { \
861 if (be_quiet) return NULL; \
862 *found_bind = 1; \
863 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
864 } \
865 ++dyn; \
866 } \
867 } \
868 }
869 SHOW_BIND(32)
870 SHOW_BIND(64)
871
872 if (be_wewy_wewy_quiet) return NULL;
873
874 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) {
875 return NULL;
876 } else {
877 *found_bind = 1;
878 return (char *) (dynamic ? "LAZY" : "STATIC");
879 }
880 }
881 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
882 {
883 unsigned long i;
884 char *soname;
885 void *strtbl_void;
886
887 if (!show_soname) return NULL;
888
889 strtbl_void = elf_findsecbyname(elf, ".dynstr");
890
891 if (elf->phdr && strtbl_void) {
892 #define SHOW_SONAME(B) \
893 if (elf->elf_class == ELFCLASS ## B) { \
894 Elf ## B ## _Dyn *dyn; \
895 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
896 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
897 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
898 Elf ## B ## _Off offset; \
899 /* only look for soname in shared objects */ \
900 if (ehdr->e_type != ET_DYN) \
901 return NULL; \
902 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
903 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
904 offset = EGET(phdr[i].p_offset); \
905 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
906 dyn = DYN ## B (elf->data + offset); \
907 while (EGET(dyn->d_tag) != DT_NULL) { \
908 if (EGET(dyn->d_tag) == DT_SONAME) { \
909 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
910 if (offset >= (Elf ## B ## _Off)elf->len) { \
911 ++dyn; \
912 continue; \
913 } \
914 soname = (char*)(elf->data + offset); \
915 *found_soname = 1; \
916 return (be_wewy_wewy_quiet ? NULL : soname); \
917 } \
918 ++dyn; \
919 } \
920 } }
921 SHOW_SONAME(32)
922 SHOW_SONAME(64)
923 }
924
925 return NULL;
926 }
927 static char *scanelf_file_sym(elfobj *elf, char *found_sym)
928 {
929 unsigned long i;
930 char *ret;
931 void *symtab_void, *strtab_void;
932
933 if (!find_sym) return NULL;
934 ret = find_sym;
935
936 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
937
938 if (symtab_void && strtab_void) {
939 #define FIND_SYM(B) \
940 if (elf->elf_class == ELFCLASS ## B) { \
941 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
942 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
943 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
944 unsigned long cnt = EGET(symtab->sh_entsize); \
945 char *symname; \
946 if (cnt) \
947 cnt = EGET(symtab->sh_size) / cnt; \
948 for (i = 0; i < cnt; ++i) { \
949 if (sym->st_name) { \
950 /* make sure the symbol name is in acceptable memory range */ \
951 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
952 if ((void*)symname > (void*)elf->data_end) { \
953 warnf("%s: corrupt ELF symbols", elf->filename); \
954 ++sym; \
955 continue; \
956 } \
957 /* debug display ... show all symbols and some extra info */ \
958 if (*ret == '*') { \
959 printf("%s(%s) %5lX %15s %s\n", \
960 ((*found_sym == 0) ? "\n\t" : "\t"), \
961 elf->base_filename, \
962 (unsigned long)sym->st_size, \
963 get_elfstttype(sym->st_info), \
964 symname); \
965 *found_sym = 1; \
966 } else { \
967 /* allow the user to specify a comma delimited list of symbols to search for */ \
968 char *this_sym, *next_sym; \
969 this_sym = ret; \
970 do { \
971 next_sym = strchr(this_sym, ','); \
972 if (next_sym == NULL) \
973 next_sym = this_sym + strlen(this_sym); \
974 /* do we want a defined symbol ? */ \
975 if (*this_sym == '+') { \
976 if (sym->st_shndx == SHN_UNDEF) \
977 goto skip_this_sym##B; \
978 ++this_sym; \
979 /* do we want an undefined symbol ? */ \
980 } else if (*this_sym == '-') { \
981 if (sym->st_shndx != SHN_UNDEF) \
982 goto skip_this_sym##B; \
983 ++this_sym; \
984 } \
985 /* ok, lets compare the name now */ \
986 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
987 (strncmp(symname, versioned_symname, strlen(versioned_symname)) == 0)) { \
988 if (be_semi_verbose) { \
989 char buf[126]; \
990 snprintf(buf, sizeof(buf), "%lX %s %s", \
991 (unsigned long)sym->st_size, get_elfstttype(sym->st_info), this_sym); \
992 ret = buf; \
993 } else \
994 ret = this_sym; \
995 (*found_sym)++; \
996 goto break_out; \
997 } \
998 skip_this_sym##B: this_sym = next_sym + 1; \
999 } while (*next_sym != '\0'); \
1000 } \
1001 } \
1002 ++sym; \
1003 } }
1004 FIND_SYM(32)
1005 FIND_SYM(64)
1006 }
1007
1008 break_out:
1009 if (be_wewy_wewy_quiet) return NULL;
1010
1011 if (*find_sym != '*' && *found_sym)
1012 return ret;
1013 if (be_quiet)
1014 return NULL;
1015 else
1016 return (char *)" - ";
1017 }
1018
1019
1020 static char *scanelf_file_sections(elfobj *elf, char *found_section)
1021 {
1022 if (!find_section)
1023 return NULL;
1024
1025 #define FIND_SECTION(B) \
1026 if (elf->elf_class == ELFCLASS ## B) { \
1027 int invert; \
1028 Elf ## B ## _Shdr *section; \
1029 invert = (*find_section == '!' ? 1 : 0); \
1030 section = SHDR ## B (elf_findsecbyname(elf, find_section+invert)); \
1031 if ((section == NULL && invert) || (section != NULL && !invert)) \
1032 *found_section = 1; \
1033 }
1034 FIND_SECTION(32)
1035 FIND_SECTION(64)
1036
1037 if (be_wewy_wewy_quiet)
1038 return NULL;
1039
1040 if (*found_section)
1041 return find_section;
1042
1043 if (be_quiet)
1044 return NULL;
1045 else
1046 return (char *)" - ";
1047 }
1048
1049 /* scan an elf file and show all the fun stuff */
1050 #define prints(str) write(fileno(stdout), str, strlen(str))
1051 static int scanelf_elfobj(elfobj *elf)
1052 {
1053 unsigned long i;
1054 char found_pax, found_phdr, found_relro, found_load, found_textrel,
1055 found_rpath, found_needed, found_interp, found_bind, found_soname,
1056 found_sym, found_lib, found_file, found_textrels, found_section;
1057 static char *out_buffer = NULL;
1058 static size_t out_len;
1059
1060 found_pax = found_phdr = found_relro = found_load = found_textrel = \
1061 found_rpath = found_needed = found_interp = found_bind = found_soname = \
1062 found_sym = found_lib = found_file = found_textrels = found_section = 0;
1063
1064 if (be_verbose > 2)
1065 printf("%s: scanning file {%s,%s}\n", elf->filename,
1066 get_elfeitype(EI_CLASS, elf->elf_class),
1067 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
1068 else if (be_verbose > 1)
1069 printf("%s: scanning file\n", elf->filename);
1070
1071 /* init output buffer */
1072 if (!out_buffer) {
1073 out_len = sizeof(char) * 80;
1074 out_buffer = (char*)xmalloc(out_len);
1075 }
1076 *out_buffer = '\0';
1077
1078 /* show the header */
1079 if (!be_quiet && show_banner) {
1080 for (i = 0; out_format[i]; ++i) {
1081 if (!IS_MODIFIER(out_format[i])) continue;
1082
1083 switch (out_format[++i]) {
1084 case '+': break;
1085 case '%': break;
1086 case '#': break;
1087 case 'F':
1088 case 'p':
1089 case 'f': prints("FILE "); found_file = 1; break;
1090 case 'o': prints(" TYPE "); break;
1091 case 'x': prints(" PAX "); break;
1092 case 'e': prints("STK/REL/PTL "); break;
1093 case 't': prints("TEXTREL "); break;
1094 case 'r': prints("RPATH "); break;
1095 case 'n': prints("NEEDED "); break;
1096 case 'i': prints("INTERP "); break;
1097 case 'b': prints("BIND "); break;
1098 case 'S': prints("SONAME "); break;
1099 case 's': prints("SYM "); break;
1100 case 'N': prints("LIB "); break;
1101 case 'T': prints("TEXTRELS "); break;
1102 case 'k': prints("SECTION "); break;
1103 default: warnf("'%c' has no title ?", out_format[i]);
1104 }
1105 }
1106 if (!found_file) prints("FILE ");
1107 prints("\n");
1108 found_file = 0;
1109 show_banner = 0;
1110 }
1111
1112 /* dump all the good stuff */
1113 for (i = 0; out_format[i]; ++i) {
1114 const char *out;
1115 const char *tmp;
1116
1117 if (!IS_MODIFIER(out_format[i])) {
1118 xchrcat(&out_buffer, out_format[i], &out_len);
1119 continue;
1120 }
1121
1122 out = NULL;
1123 be_wewy_wewy_quiet = (out_format[i] == '#');
1124 be_semi_verbose = (out_format[i] == '+');
1125 switch (out_format[++i]) {
1126 case '+':
1127 case '%':
1128 case '#':
1129 xchrcat(&out_buffer, out_format[i], &out_len); break;
1130 case 'F':
1131 found_file = 1;
1132 if (be_wewy_wewy_quiet) break;
1133 xstrcat(&out_buffer, elf->filename, &out_len);
1134 break;
1135 case 'p':
1136 found_file = 1;
1137 if (be_wewy_wewy_quiet) break;
1138 tmp = elf->filename;
1139 if (search_path) {
1140 ssize_t len_search = strlen(search_path);
1141 ssize_t len_file = strlen(elf->filename);
1142 if (!strncmp(elf->filename, search_path, len_search) && \
1143 len_file > len_search)
1144 tmp += len_search;
1145 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1146 }
1147 xstrcat(&out_buffer, tmp, &out_len);
1148 break;
1149 case 'f':
1150 found_file = 1;
1151 if (be_wewy_wewy_quiet) break;
1152 tmp = strrchr(elf->filename, '/');
1153 tmp = (tmp == NULL ? elf->filename : tmp+1);
1154 xstrcat(&out_buffer, tmp, &out_len);
1155 break;
1156 case 'o': out = get_elfetype(elf); break;
1157 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
1158 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
1159 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1160 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
1161 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1162 case 'n':
1163 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
1164 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1165 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1166 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
1167 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1168 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1169 default: warnf("'%c' has no scan code?", out_format[i]);
1170 }
1171 if (out) {
1172 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
1173 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
1174 xstrncat(&out_buffer, out, &out_len, (tmp-out));
1175 else
1176 xstrcat(&out_buffer, out, &out_len);
1177 }
1178 }
1179
1180 #define FOUND_SOMETHING() \
1181 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1182 found_rpath || found_needed || found_interp || found_bind || \
1183 found_soname || found_sym || found_lib || found_textrels || found_section )
1184
1185 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1186 xchrcat(&out_buffer, ' ', &out_len);
1187 xstrcat(&out_buffer, elf->filename, &out_len);
1188 }
1189 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
1190 puts(out_buffer);
1191 fflush(stdout);
1192 }
1193
1194 return 0;
1195 }
1196
1197 /* scan a single elf */
1198 static int scanelf_elf(const char *filename, int fd, size_t len)
1199 {
1200 int ret = 1;
1201 elfobj *elf;
1202
1203 /* verify this is real ELF */
1204 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1205 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1206 return ret;
1207 }
1208 switch (match_bits) {
1209 case 32:
1210 if (elf->elf_class != ELFCLASS32)
1211 goto label_done;
1212 break;
1213 case 64:
1214 if (elf->elf_class != ELFCLASS64)
1215 goto label_done;
1216 break;
1217 default: break;
1218 }
1219 if (strlen(match_etypes)) {
1220 char sbuf[126];
1221 strncpy(sbuf, match_etypes, sizeof(sbuf));
1222 if (strchr(match_etypes, ',') != NULL) {
1223 char *p;
1224 while((p = strrchr(sbuf, ',')) != NULL) {
1225 *p = 0;
1226 if (etype_lookup(p+1) == get_etype(elf))
1227 goto label_ret;
1228 }
1229 }
1230 if (etype_lookup(sbuf) != get_etype(elf))
1231 goto label_done;
1232 }
1233
1234 label_ret:
1235 ret = scanelf_elfobj(elf);
1236
1237 label_done:
1238 unreadelf(elf);
1239 return ret;
1240 }
1241
1242 /* scan an archive of elfs */
1243 static int scanelf_archive(const char *filename, int fd, size_t len)
1244 {
1245 archive_handle *ar;
1246 archive_member *m;
1247 char *ar_buffer;
1248 elfobj *elf;
1249
1250 ar = ar_open_fd(filename, fd);
1251 if (ar == NULL)
1252 return 1;
1253
1254 ar_buffer = (char*)mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1255 while ((m=ar_next(ar)) != NULL) {
1256 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size);
1257 if (elf) {
1258 scanelf_elfobj(elf);
1259 unreadelf(elf);
1260 }
1261 }
1262 munmap(ar_buffer, len);
1263
1264 return 0;
1265 }
1266 /* scan a file which may be an elf or an archive or some other magical beast */
1267 static void scanelf_file(const char *filename)
1268 {
1269 struct stat st;
1270 int fd;
1271
1272 /* make sure 'filename' exists */
1273 if (lstat(filename, &st) == -1) {
1274 if (be_verbose > 2) printf("%s: does not exist\n", filename);
1275 return;
1276 }
1277
1278 /* always handle regular files and handle symlinked files if no -y */
1279 if (S_ISLNK(st.st_mode)) {
1280 if (!scan_symlink) return;
1281 stat(filename, &st);
1282 }
1283 if (!S_ISREG(st.st_mode)) {
1284 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1285 return;
1286 }
1287
1288 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1289 return;
1290
1291 if (scanelf_elf(filename, fd, st.st_size) == 1 && scan_archives)
1292 /* if it isn't an ELF, maybe it's an .a archive */
1293 scanelf_archive(filename, fd, st.st_size);
1294
1295 close(fd);
1296 }
1297
1298 /* scan a directory for ET_EXEC files and print when we find one */
1299 static void scanelf_dir(const char *path)
1300 {
1301 register DIR *dir;
1302 register struct dirent *dentry;
1303 struct stat st_top, st;
1304 char buf[__PAX_UTILS_PATH_MAX];
1305 size_t pathlen = 0, len = 0;
1306
1307 /* make sure path exists */
1308 if (lstat(path, &st_top) == -1) {
1309 if (be_verbose > 2) printf("%s: does not exist\n", path);
1310 return;
1311 }
1312
1313 /* ok, if it isn't a directory, assume we can open it */
1314 if (!S_ISDIR(st_top.st_mode)) {
1315 scanelf_file(path);
1316 return;
1317 }
1318
1319 /* now scan the dir looking for fun stuff */
1320 if ((dir = opendir(path)) == NULL) {
1321 warnf("could not opendir %s: %s", path, strerror(errno));
1322 return;
1323 }
1324 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1325
1326 pathlen = strlen(path);
1327 while ((dentry = readdir(dir))) {
1328 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1329 continue;
1330 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
1331 if (len >= sizeof(buf)) {
1332 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1333 (unsigned long)len, (unsigned long)sizeof(buf));
1334 continue;
1335 }
1336 snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name);
1337 if (lstat(buf, &st) != -1) {
1338 if (S_ISREG(st.st_mode))
1339 scanelf_file(buf);
1340 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1341 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1342 scanelf_dir(buf);
1343 }
1344 }
1345 }
1346 closedir(dir);
1347 }
1348
1349 static int scanelf_from_file(const char *filename)
1350 {
1351 FILE *fp = NULL;
1352 char *p;
1353 char path[__PAX_UTILS_PATH_MAX];
1354
1355 if (strcmp(filename, "-") == 0)
1356 fp = stdin;
1357 else if ((fp = fopen(filename, "r")) == NULL)
1358 return 1;
1359
1360 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1361 if ((p = strchr(path, '\n')) != NULL)
1362 *p = 0;
1363 search_path = path;
1364 scanelf_dir(path);
1365 }
1366 if (fp != stdin)
1367 fclose(fp);
1368 return 0;
1369 }
1370
1371 #if defined(__GLIBC__) || defined(__UCLIBC__)
1372
1373 static int load_ld_cache_config(int i, const char *fname)
1374 {
1375 FILE *fp = NULL;
1376 char *p;
1377 char path[__PAX_UTILS_PATH_MAX];
1378
1379 if (i + 1 == ARRAY_SIZE(ldpaths))
1380 return i;
1381
1382 if ((fp = fopen(fname, "r")) == NULL)
1383 return i;
1384
1385 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1386 if ((p = strrchr(path, '\r')) != NULL)
1387 *p = 0;
1388 if ((p = strchr(path, '\n')) != NULL)
1389 *p = 0;
1390 // recursive includes of the same file will make this segfault.
1391 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1392 glob64_t gl;
1393 size_t x;
1394 char gpath[__PAX_UTILS_PATH_MAX];
1395
1396 memset(gpath, 0, sizeof(gpath));
1397
1398 if (path[8] != '/')
1399 snprintf(gpath, sizeof(gpath), "/etc/%s", &path[8]);
1400 else
1401 strncpy(gpath, &path[8], sizeof(gpath));
1402
1403 if ((glob64(gpath, 0, NULL, &gl)) == 0) {
1404 for (x = 0; x < gl.gl_pathc; ++x) {
1405 /* try to avoid direct loops */
1406 if (strcmp(gl.gl_pathv[x], fname) == 0)
1407 continue;
1408 i = load_ld_cache_config(i, gl.gl_pathv[x]);
1409 if (i + 1 >= ARRAY_SIZE(ldpaths)) {
1410 globfree64(&gl);
1411 return i;
1412 }
1413 }
1414 globfree64 (&gl);
1415 continue;
1416 } else
1417 abort();
1418 }
1419 if (*path != '/')
1420 continue;
1421
1422 ldpaths[i++] = xstrdup(path);
1423
1424 if (i + 1 == ARRAY_SIZE(ldpaths))
1425 break;
1426 }
1427 ldpaths[i] = NULL;
1428
1429 fclose(fp);
1430 return i;
1431 }
1432
1433 #elif defined(__FreeBSD__) || (__DragonFly__)
1434
1435 static int load_ld_cache_config(int i, const char *fname)
1436 {
1437 FILE *fp = NULL;
1438 char *b = NULL, *p;
1439 struct elfhints_hdr hdr;
1440
1441 if (i + 1 == ARRAY_SIZE(ldpaths))
1442 return i;
1443
1444 if ((fp = fopen(fname, "r")) == NULL)
1445 return i;
1446
1447 if ( fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1448 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1449 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1
1450 ) {
1451 fclose(fp);
1452 return i;
1453 }
1454
1455 b = (char*)malloc(hdr.dirlistlen+1);
1456 if ( fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1 ) {
1457 fclose(fp);
1458 free(b);
1459 return i;
1460 }
1461
1462 while ( (p = strsep(&b, ":")) ) {
1463 if ( *p == '\0' ) continue;
1464 ldpaths[i++] = xstrdup(p);
1465
1466 if (i + 1 == ARRAY_SIZE(ldpaths))
1467 break;
1468 }
1469 ldpaths[i] = NULL;
1470
1471 free(b);
1472 fclose(fp);
1473 return i;
1474 }
1475
1476 #else
1477
1478 #warning Cache config support not implemented for your target
1479 static int load_ld_cache_config(int i, const char *fname)
1480 {
1481 memset(ldpaths, 0x00, sizeof(ldpaths));
1482 }
1483
1484 #endif
1485
1486 /* scan /etc/ld.so.conf for paths */
1487 static void scanelf_ldpath()
1488 {
1489 char scan_l, scan_ul, scan_ull;
1490 int i = 0;
1491
1492 if (!ldpaths[0])
1493 err("Unable to load any paths from ld.so.conf");
1494
1495 scan_l = scan_ul = scan_ull = 0;
1496
1497 while (ldpaths[i]) {
1498 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
1499 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
1500 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
1501 scanelf_dir(ldpaths[i]);
1502 ++i;
1503 }
1504
1505 if (!scan_l) scanelf_dir("/lib");
1506 if (!scan_ul) scanelf_dir("/usr/lib");
1507 if (!scan_ull) scanelf_dir("/usr/local/lib");
1508 }
1509
1510 /* scan env PATH for paths */
1511 static void scanelf_envpath()
1512 {
1513 char *path, *p;
1514
1515 path = getenv("PATH");
1516 if (!path)
1517 err("PATH is not set in your env !");
1518 path = xstrdup(path);
1519
1520 while ((p = strrchr(path, ':')) != NULL) {
1521 scanelf_dir(p + 1);
1522 *p = 0;
1523 }
1524
1525 free(path);
1526 }
1527
1528 /* usage / invocation handling functions */
1529 #define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:BhV"
1530 #define a_argument required_argument
1531 static struct option const long_opts[] = {
1532 {"path", no_argument, NULL, 'p'},
1533 {"ldpath", no_argument, NULL, 'l'},
1534 {"recursive", no_argument, NULL, 'R'},
1535 {"mount", no_argument, NULL, 'm'},
1536 {"symlink", no_argument, NULL, 'y'},
1537 {"archives", no_argument, NULL, 'A'},
1538 {"ldcache", no_argument, NULL, 'L'},
1539 {"fix", no_argument, NULL, 'X'},
1540 {"setpax", a_argument, NULL, 'z'},
1541 {"pax", no_argument, NULL, 'x'},
1542 {"header", no_argument, NULL, 'e'},
1543 {"textrel", no_argument, NULL, 't'},
1544 {"rpath", no_argument, NULL, 'r'},
1545 {"needed", no_argument, NULL, 'n'},
1546 {"interp", no_argument, NULL, 'i'},
1547 {"bind", no_argument, NULL, 'b'},
1548 {"soname", no_argument, NULL, 'S'},
1549 {"symbol", a_argument, NULL, 's'},
1550 {"section", a_argument, NULL, 'k'},
1551 {"lib", a_argument, NULL, 'N'},
1552 {"gmatch", no_argument, NULL, 'g'},
1553 {"textrels", no_argument, NULL, 'T'},
1554 {"etype", a_argument, NULL, 'E'},
1555 {"bits", a_argument, NULL, 'M'},
1556 {"all", no_argument, NULL, 'a'},
1557 {"quiet", no_argument, NULL, 'q'},
1558 {"verbose", no_argument, NULL, 'v'},
1559 {"format", a_argument, NULL, 'F'},
1560 {"from", a_argument, NULL, 'f'},
1561 {"file", a_argument, NULL, 'o'},
1562 {"nobanner", no_argument, NULL, 'B'},
1563 {"help", no_argument, NULL, 'h'},
1564 {"version", no_argument, NULL, 'V'},
1565 {NULL, no_argument, NULL, 0x0}
1566 };
1567
1568 static const char *opts_help[] = {
1569 "Scan all directories in PATH environment",
1570 "Scan all directories in /etc/ld.so.conf",
1571 "Scan directories recursively",
1572 "Don't recursively cross mount points",
1573 "Don't scan symlinks",
1574 "Scan archives (.a files)",
1575 "Utilize ld.so.cache information (use with -r/-n)",
1576 "Try and 'fix' bad things (use with -r/-e)",
1577 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1578 "Print PaX markings",
1579 "Print GNU_STACK/PT_LOAD markings",
1580 "Print TEXTREL information",
1581 "Print RPATH information",
1582 "Print NEEDED information",
1583 "Print INTERP information",
1584 "Print BIND information",
1585 "Print SONAME information",
1586 "Find a specified symbol",
1587 "Find a specified section",
1588 "Find a specified library",
1589 "Use strncmp to match libraries. (use with -N)",
1590 "Locate cause of TEXTREL",
1591 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1592 "Print only ELF files matching numeric bits",
1593 "Print all scanned info (-x -e -t -r -b)\n",
1594 "Only output 'bad' things",
1595 "Be verbose (can be specified more than once)",
1596 "Use specified format for output",
1597 "Read input stream from a filename",
1598 "Write output stream to a filename",
1599 "Don't display the header",
1600 "Print this help and exit",
1601 "Print version and exit",
1602 NULL
1603 };
1604
1605 /* display usage and exit */
1606 static void usage(int status)
1607 {
1608 unsigned long i;
1609 printf("* Scan ELF binaries for stuff\n\n"
1610 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1611 printf("Options: -[%s]\n", PARSE_FLAGS);
1612 for (i = 0; long_opts[i].name; ++i)
1613 if (long_opts[i].has_arg == no_argument)
1614 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
1615 long_opts[i].name, opts_help[i]);
1616 else
1617 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
1618 long_opts[i].name, opts_help[i]);
1619
1620 if (status != EXIT_SUCCESS)
1621 exit(status);
1622
1623 puts("\nThe format modifiers for the -F option are:");
1624 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1625 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1626 puts(" i INTERP \tb BIND \ts symbol");
1627 puts(" N library \to Type \tT TEXTRELs");
1628 puts(" S SONAME \tk section");
1629 puts(" p filename (with search path removed)");
1630 puts(" f filename (short name/basename)");
1631 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1632
1633 puts("\nELF Etypes:");
1634 print_etypes(stdout);
1635
1636 exit(status);
1637 }
1638
1639 /* parse command line arguments and preform needed actions */
1640 static void parseargs(int argc, char *argv[])
1641 {
1642 int i;
1643 const char *from_file = NULL;
1644
1645 opterr = 0;
1646 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1647 switch (i) {
1648
1649 case 'V':
1650 printf("pax-utils-%s: %s compiled %s\n%s\n"
1651 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
1652 VERSION, __FILE__, __DATE__, rcsid, argv0);
1653 exit(EXIT_SUCCESS);
1654 break;
1655 case 'h': usage(EXIT_SUCCESS); break;
1656 case 'f':
1657 if (from_file) warn("You prob don't want to specify -f twice");
1658 from_file = optarg;
1659 break;
1660 case 'E':
1661 strncpy(match_etypes, optarg, sizeof(match_etypes));
1662 break;
1663 case 'M':
1664 match_bits = atoi(optarg);
1665 break;
1666 case 'o': {
1667 if (freopen(optarg, "w", stdout) == NULL)
1668 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1669 break;
1670 }
1671 case 'k':
1672 if (find_section) warn("You prob don't want to specify -k twice");
1673 find_section = optarg;
1674 break;
1675 case 's': {
1676 if (find_sym) warn("You prob don't want to specify -s twice");
1677 find_sym = optarg;
1678 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1679 sprintf(versioned_symname, "%s@", find_sym);
1680 break;
1681 }
1682 case 'N': {
1683 if (find_lib) warn("You prob don't want to specify -N twice");
1684 find_lib = optarg;
1685 break;
1686 }
1687
1688 case 'F': {
1689 if (out_format) warn("You prob don't want to specify -F twice");
1690 out_format = optarg;
1691 break;
1692 }
1693 case 'z': {
1694 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1695 size_t x;
1696
1697 for (x = 0 ; x < strlen(optarg); x++) {
1698 switch(optarg[x]) {
1699 case 'p':
1700 case 'P':
1701 do_state(optarg[x], PAGEEXEC);
1702 break;
1703 case 's':
1704 case 'S':
1705 do_state(optarg[x], SEGMEXEC);
1706 break;
1707 case 'm':
1708 case 'M':
1709 do_state(optarg[x], MPROTECT);
1710 break;
1711 case 'e':
1712 case 'E':
1713 do_state(optarg[x], EMUTRAMP);
1714 break;
1715 case 'r':
1716 case 'R':
1717 do_state(optarg[x], RANDMMAP);
1718 break;
1719 case 'x':
1720 case 'X':
1721 do_state(optarg[x], RANDEXEC);
1722 break;
1723 default:
1724 break;
1725 }
1726 }
1727 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
1728 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
1729 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
1730 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
1731 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1732 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1733 setpax = flags;
1734 break;
1735 }
1736 case 'g': gmatch = 1; break;
1737 case 'L': use_ldcache = 1; break;
1738 case 'y': scan_symlink = 0; break;
1739 case 'A': scan_archives = 1; break;
1740 case 'B': show_banner = 0; break;
1741 case 'l': scan_ldpath = 1; break;
1742 case 'p': scan_envpath = 1; break;
1743 case 'R': dir_recurse = 1; break;
1744 case 'm': dir_crossmount = 0; break;
1745 case 'X': ++fix_elf; break;
1746 case 'x': show_pax = 1; break;
1747 case 'e': show_phdr = 1; break;
1748 case 't': show_textrel = 1; break;
1749 case 'r': show_rpath = 1; break;
1750 case 'n': show_needed = 1; break;
1751 case 'i': show_interp = 1; break;
1752 case 'b': show_bind = 1; break;
1753 case 'S': show_soname = 1; break;
1754 case 'T': show_textrels = 1; break;
1755 case 'q': be_quiet = 1; break;
1756 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1757 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
1758
1759 case ':':
1760 err("Option '%c' is missing parameter", optopt);
1761 case '?':
1762 err("Unknown option '%c' or argument missing", optopt);
1763 default:
1764 err("Unhandled option '%c'; please report this", i);
1765 }
1766 }
1767
1768 /* let the format option override all other options */
1769 if (out_format) {
1770 show_pax = show_phdr = show_textrel = show_rpath = \
1771 show_needed = show_interp = show_bind = show_soname = \
1772 show_textrels = 0;
1773 for (i = 0; out_format[i]; ++i) {
1774 if (!IS_MODIFIER(out_format[i])) continue;
1775
1776 switch (out_format[++i]) {
1777 case '+': break;
1778 case '%': break;
1779 case '#': break;
1780 case 'F': break;
1781 case 'p': break;
1782 case 'f': break;
1783 case 'k': break;
1784 case 's': break;
1785 case 'N': break;
1786 case 'o': break;
1787 case 'x': show_pax = 1; break;
1788 case 'e': show_phdr = 1; break;
1789 case 't': show_textrel = 1; break;
1790 case 'r': show_rpath = 1; break;
1791 case 'n': show_needed = 1; break;
1792 case 'i': show_interp = 1; break;
1793 case 'b': show_bind = 1; break;
1794 case 'S': show_soname = 1; break;
1795 case 'T': show_textrels = 1; break;
1796 default:
1797 err("Invalid format specifier '%c' (byte %i)",
1798 out_format[i], i+1);
1799 }
1800 }
1801
1802 /* construct our default format */
1803 } else {
1804 size_t fmt_len = 30;
1805 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
1806 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1807 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1808 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1809 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1810 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1811 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1812 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1813 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1814 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1815 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1816 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1817 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1818 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1819 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1820 }
1821 if (be_verbose > 2) printf("Format: %s\n", out_format);
1822
1823 /* now lets actually do the scanning */
1824 if (scan_ldpath || use_ldcache)
1825 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
1826 if (scan_ldpath) scanelf_ldpath();
1827 if (scan_envpath) scanelf_envpath();
1828 if (!from_file && optind == argc && ttyname(0) == NULL)
1829 from_file = "-";
1830 if (from_file) {
1831 scanelf_from_file(from_file);
1832 from_file = *argv;
1833 }
1834 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1835 err("Nothing to scan !?");
1836 while (optind < argc) {
1837 search_path = argv[optind++];
1838 scanelf_dir(search_path);
1839 }
1840
1841 /* clean up */
1842 if (versioned_symname) free(versioned_symname);
1843 for (i = 0; ldpaths[i]; ++i)
1844 free(ldpaths[i]);
1845
1846 if (ldcache != 0)
1847 munmap(ldcache, ldcache_size);
1848 }
1849
1850 static char **get_split_env(const char *envvar)
1851 {
1852 char **envvals = NULL;
1853 char *saveptr = NULL;
1854 char *env;
1855 char *s;
1856 int nentry;
1857
1858 if ((env = getenv(envvar)) == NULL)
1859 return NULL;
1860
1861 env = xstrdup(env);
1862 if (env == NULL)
1863 return NULL;
1864
1865 nentry = 0;
1866 for (s = strtok_r(env, " \t\n", &saveptr); s != NULL; s = strtok_r(NULL, " \t\n", &saveptr)) {
1867 if ((envvals = xrealloc(envvals, sizeof(char *)*(nentry+1))) == NULL)
1868 return NULL;
1869 envvals[nentry++] = s;
1870 }
1871 envvals[nentry] = NULL;
1872
1873 return envvals;
1874 }
1875
1876 static void parseenv()
1877 {
1878 qa_textrels = get_split_env("QA_TEXTRELS");
1879 qa_execstack = get_split_env("QA_EXECSTACK");
1880 qa_wx_load = get_split_env("QA_WX_LOAD");
1881 }
1882
1883
1884
1885 int main(int argc, char *argv[])
1886 {
1887 if (argc < 2)
1888 usage(EXIT_FAILURE);
1889 parseenv();
1890 parseargs(argc, argv);
1891 fclose(stdout);
1892 #ifdef __BOUNDS_CHECKING_ON
1893 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()");
1894 #endif
1895 return EXIT_SUCCESS;
1896 }

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