/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.148 - (show annotations) (download) (as text)
Sun May 14 21:18:38 2006 UTC (8 years, 4 months ago) by vapier
Branch: MAIN
Changes since 1.147: +22 -13 lines
File MIME type: text/x-csrc
cut down on the arch-specific ifdef cruft

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 1.147 2006/05/14 21:07:39 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 1.147 2006/05/14 21:07:39 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
680 #if defined(__GLIBC__) || defined(__UCLIBC__)
681
682 static char *lookup_cache_lib(elfobj *elf, char *fname)
683 {
684 int fd = 0;
685 char *strs;
686 static char buf[__PAX_UTILS_PATH_MAX] = "";
687 const char *cachefile = "/etc/ld.so.cache";
688 struct stat st;
689
690 typedef struct {
691 char magic[LDSO_CACHE_MAGIC_LEN];
692 char version[LDSO_CACHE_VER_LEN];
693 int nlibs;
694 } header_t;
695 header_t *header;
696
697 typedef struct {
698 int flags;
699 int sooffset;
700 int liboffset;
701 } libentry_t;
702 libentry_t *libent;
703
704 if (fname == NULL)
705 return NULL;
706
707 if (ldcache == 0) {
708 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1)
709 return NULL;
710
711 /* cache these values so we only map/unmap the cache file once */
712 ldcache_size = st.st_size;
713 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
714
715 close(fd);
716
717 if (ldcache == (caddr_t)-1) {
718 ldcache = 0;
719 return NULL;
720 }
721
722 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
723 return NULL;
724 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
725 return NULL;
726 }
727
728 header = (header_t *) ldcache;
729 libent = (libentry_t *) (ldcache + sizeof(header_t));
730 strs = (char *) &libent[header->nlibs];
731
732 for (fd = 0; fd < header->nlibs; fd++) {
733 /* this should be more fine grained, but for now we assume that
734 * diff arches will not be cached together. and we ignore the
735 * the different multilib mips cases. */
736 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
737 continue;
738 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
739 continue;
740
741 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
742 continue;
743 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
744 }
745 return buf;
746 }
747
748 #else
749 #warning Cache support not implemented for your target
750 static char *lookup_cache_lib(elfobj *elf, char *fname)
751 {
752 return NULL;
753 }
754 #endif
755
756 static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
757 {
758 unsigned long i;
759 char *needed;
760 void *strtbl_void;
761 char *p;
762
763 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
764
765 strtbl_void = elf_findsecbyname(elf, ".dynstr");
766
767 if (elf->phdr && strtbl_void) {
768 #define SHOW_NEEDED(B) \
769 if (elf->elf_class == ELFCLASS ## B) { \
770 Elf ## B ## _Dyn *dyn; \
771 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
772 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
773 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
774 Elf ## B ## _Off offset; \
775 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
776 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
777 offset = EGET(phdr[i].p_offset); \
778 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
779 dyn = DYN ## B (elf->data + offset); \
780 while (EGET(dyn->d_tag) != DT_NULL) { \
781 if (EGET(dyn->d_tag) == DT_NEEDED) { \
782 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
783 if (offset >= (Elf ## B ## _Off)elf->len) { \
784 ++dyn; \
785 continue; \
786 } \
787 needed = (char*)(elf->data + offset); \
788 if (op == 0) { \
789 if (!be_wewy_wewy_quiet) { \
790 if (*found_needed) xchrcat(ret, ',', ret_len); \
791 if (use_ldcache) \
792 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
793 needed = p; \
794 xstrcat(ret, needed, ret_len); \
795 } \
796 *found_needed = 1; \
797 } else { \
798 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \
799 *found_lib = 1; \
800 return (be_wewy_wewy_quiet ? NULL : needed); \
801 } \
802 } \
803 } \
804 ++dyn; \
805 } \
806 } }
807 SHOW_NEEDED(32)
808 SHOW_NEEDED(64)
809 if (op == 0 && !*found_needed && be_verbose)
810 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
811 }
812
813 return NULL;
814 }
815 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
816 {
817 void *strtbl_void;
818
819 if (!show_interp) return NULL;
820
821 strtbl_void = elf_findsecbyname(elf, ".interp");
822
823 if (strtbl_void) {
824 #define SHOW_INTERP(B) \
825 if (elf->elf_class == ELFCLASS ## B) { \
826 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
827 *found_interp = 1; \
828 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
829 }
830 SHOW_INTERP(32)
831 SHOW_INTERP(64)
832 }
833 return NULL;
834 }
835 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
836 {
837 unsigned long i;
838 struct stat s;
839 char dynamic = 0;
840
841 if (!show_bind) return NULL;
842 if (!elf->phdr) return NULL;
843
844 #define SHOW_BIND(B) \
845 if (elf->elf_class == ELFCLASS ## B) { \
846 Elf ## B ## _Dyn *dyn; \
847 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
848 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
849 Elf ## B ## _Off offset; \
850 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
851 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
852 dynamic = 1; \
853 offset = EGET(phdr[i].p_offset); \
854 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
855 dyn = DYN ## B (elf->data + offset); \
856 while (EGET(dyn->d_tag) != DT_NULL) { \
857 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
858 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
859 { \
860 if (be_quiet) return NULL; \
861 *found_bind = 1; \
862 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
863 } \
864 ++dyn; \
865 } \
866 } \
867 }
868 SHOW_BIND(32)
869 SHOW_BIND(64)
870
871 if (be_wewy_wewy_quiet) return NULL;
872
873 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) {
874 return NULL;
875 } else {
876 *found_bind = 1;
877 return (char *) (dynamic ? "LAZY" : "STATIC");
878 }
879 }
880 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
881 {
882 unsigned long i;
883 char *soname;
884 void *strtbl_void;
885
886 if (!show_soname) return NULL;
887
888 strtbl_void = elf_findsecbyname(elf, ".dynstr");
889
890 if (elf->phdr && strtbl_void) {
891 #define SHOW_SONAME(B) \
892 if (elf->elf_class == ELFCLASS ## B) { \
893 Elf ## B ## _Dyn *dyn; \
894 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
895 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
896 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
897 Elf ## B ## _Off offset; \
898 /* only look for soname in shared objects */ \
899 if (ehdr->e_type != ET_DYN) \
900 return NULL; \
901 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
902 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
903 offset = EGET(phdr[i].p_offset); \
904 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
905 dyn = DYN ## B (elf->data + offset); \
906 while (EGET(dyn->d_tag) != DT_NULL) { \
907 if (EGET(dyn->d_tag) == DT_SONAME) { \
908 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
909 if (offset >= (Elf ## B ## _Off)elf->len) { \
910 ++dyn; \
911 continue; \
912 } \
913 soname = (char*)(elf->data + offset); \
914 *found_soname = 1; \
915 return (be_wewy_wewy_quiet ? NULL : soname); \
916 } \
917 ++dyn; \
918 } \
919 } }
920 SHOW_SONAME(32)
921 SHOW_SONAME(64)
922 }
923
924 return NULL;
925 }
926 static char *scanelf_file_sym(elfobj *elf, char *found_sym)
927 {
928 unsigned long i;
929 char *ret;
930 void *symtab_void, *strtab_void;
931
932 if (!find_sym) return NULL;
933 ret = find_sym;
934
935 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
936
937 if (symtab_void && strtab_void) {
938 #define FIND_SYM(B) \
939 if (elf->elf_class == ELFCLASS ## B) { \
940 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
941 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
942 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
943 unsigned long cnt = EGET(symtab->sh_entsize); \
944 char *symname; \
945 if (cnt) \
946 cnt = EGET(symtab->sh_size) / cnt; \
947 for (i = 0; i < cnt; ++i) { \
948 if (sym->st_name) { \
949 /* make sure the symbol name is in acceptable memory range */ \
950 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
951 if ((void*)symname > (void*)elf->data_end) { \
952 warnf("%s: corrupt ELF symbols", elf->filename); \
953 ++sym; \
954 continue; \
955 } \
956 /* debug display ... show all symbols and some extra info */ \
957 if (*ret == '*') { \
958 printf("%s(%s) %5lX %15s %s\n", \
959 ((*found_sym == 0) ? "\n\t" : "\t"), \
960 elf->base_filename, \
961 (unsigned long)sym->st_size, \
962 get_elfstttype(sym->st_info), \
963 symname); \
964 *found_sym = 1; \
965 } else { \
966 /* allow the user to specify a comma delimited list of symbols to search for */ \
967 char *this_sym, *next_sym; \
968 this_sym = ret; \
969 do { \
970 next_sym = strchr(this_sym, ','); \
971 if (next_sym == NULL) \
972 next_sym = this_sym + strlen(this_sym); \
973 /* do we want a defined symbol ? */ \
974 if (*this_sym == '+') { \
975 if (sym->st_shndx == SHN_UNDEF) \
976 goto skip_this_sym##B; \
977 ++this_sym; \
978 /* do we want an undefined symbol ? */ \
979 } else if (*this_sym == '-') { \
980 if (sym->st_shndx != SHN_UNDEF) \
981 goto skip_this_sym##B; \
982 ++this_sym; \
983 } \
984 /* ok, lets compare the name now */ \
985 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
986 (strncmp(symname, versioned_symname, strlen(versioned_symname)) == 0)) { \
987 if (be_semi_verbose) { \
988 char buf[126]; \
989 snprintf(buf, sizeof(buf), "%lX %s %s", \
990 (unsigned long)sym->st_size, get_elfstttype(sym->st_info), this_sym); \
991 ret = buf; \
992 } else \
993 ret = this_sym; \
994 (*found_sym)++; \
995 goto break_out; \
996 } \
997 skip_this_sym##B: this_sym = next_sym + 1; \
998 } while (*next_sym != '\0'); \
999 } \
1000 } \
1001 ++sym; \
1002 } }
1003 FIND_SYM(32)
1004 FIND_SYM(64)
1005 }
1006
1007 break_out:
1008 if (be_wewy_wewy_quiet) return NULL;
1009
1010 if (*find_sym != '*' && *found_sym)
1011 return ret;
1012 if (be_quiet)
1013 return NULL;
1014 else
1015 return (char *)" - ";
1016 }
1017
1018
1019 static char *scanelf_file_sections(elfobj *elf, char *found_section)
1020 {
1021 if (!find_section)
1022 return NULL;
1023
1024 #define FIND_SECTION(B) \
1025 if (elf->elf_class == ELFCLASS ## B) { \
1026 int invert; \
1027 Elf ## B ## _Shdr *section; \
1028 invert = (*find_section == '!' ? 1 : 0); \
1029 section = SHDR ## B (elf_findsecbyname(elf, find_section+invert)); \
1030 if ((section == NULL && invert) || (section != NULL && !invert)) \
1031 *found_section = 1; \
1032 }
1033 FIND_SECTION(32)
1034 FIND_SECTION(64)
1035
1036 if (be_wewy_wewy_quiet)
1037 return NULL;
1038
1039 if (*found_section)
1040 return find_section;
1041
1042 if (be_quiet)
1043 return NULL;
1044 else
1045 return (char *)" - ";
1046 }
1047
1048 /* scan an elf file and show all the fun stuff */
1049 #define prints(str) write(fileno(stdout), str, strlen(str))
1050 static int scanelf_elfobj(elfobj *elf)
1051 {
1052 unsigned long i;
1053 char found_pax, found_phdr, found_relro, found_load, found_textrel,
1054 found_rpath, found_needed, found_interp, found_bind, found_soname,
1055 found_sym, found_lib, found_file, found_textrels, found_section;
1056 static char *out_buffer = NULL;
1057 static size_t out_len;
1058
1059 found_pax = found_phdr = found_relro = found_load = found_textrel = \
1060 found_rpath = found_needed = found_interp = found_bind = found_soname = \
1061 found_sym = found_lib = found_file = found_textrels = found_section = 0;
1062
1063 if (be_verbose > 2)
1064 printf("%s: scanning file {%s,%s}\n", elf->filename,
1065 get_elfeitype(EI_CLASS, elf->elf_class),
1066 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
1067 else if (be_verbose > 1)
1068 printf("%s: scanning file\n", elf->filename);
1069
1070 /* init output buffer */
1071 if (!out_buffer) {
1072 out_len = sizeof(char) * 80;
1073 out_buffer = (char*)xmalloc(out_len);
1074 }
1075 *out_buffer = '\0';
1076
1077 /* show the header */
1078 if (!be_quiet && show_banner) {
1079 for (i = 0; out_format[i]; ++i) {
1080 if (!IS_MODIFIER(out_format[i])) continue;
1081
1082 switch (out_format[++i]) {
1083 case '+': break;
1084 case '%': break;
1085 case '#': break;
1086 case 'F':
1087 case 'p':
1088 case 'f': prints("FILE "); found_file = 1; break;
1089 case 'o': prints(" TYPE "); break;
1090 case 'x': prints(" PAX "); break;
1091 case 'e': prints("STK/REL/PTL "); break;
1092 case 't': prints("TEXTREL "); break;
1093 case 'r': prints("RPATH "); break;
1094 case 'n': prints("NEEDED "); break;
1095 case 'i': prints("INTERP "); break;
1096 case 'b': prints("BIND "); break;
1097 case 'S': prints("SONAME "); break;
1098 case 's': prints("SYM "); break;
1099 case 'N': prints("LIB "); break;
1100 case 'T': prints("TEXTRELS "); break;
1101 case 'k': prints("SECTION "); break;
1102 default: warnf("'%c' has no title ?", out_format[i]);
1103 }
1104 }
1105 if (!found_file) prints("FILE ");
1106 prints("\n");
1107 found_file = 0;
1108 show_banner = 0;
1109 }
1110
1111 /* dump all the good stuff */
1112 for (i = 0; out_format[i]; ++i) {
1113 const char *out;
1114 const char *tmp;
1115
1116 if (!IS_MODIFIER(out_format[i])) {
1117 xchrcat(&out_buffer, out_format[i], &out_len);
1118 continue;
1119 }
1120
1121 out = NULL;
1122 be_wewy_wewy_quiet = (out_format[i] == '#');
1123 be_semi_verbose = (out_format[i] == '+');
1124 switch (out_format[++i]) {
1125 case '+':
1126 case '%':
1127 case '#':
1128 xchrcat(&out_buffer, out_format[i], &out_len); break;
1129 case 'F':
1130 found_file = 1;
1131 if (be_wewy_wewy_quiet) break;
1132 xstrcat(&out_buffer, elf->filename, &out_len);
1133 break;
1134 case 'p':
1135 found_file = 1;
1136 if (be_wewy_wewy_quiet) break;
1137 tmp = elf->filename;
1138 if (search_path) {
1139 ssize_t len_search = strlen(search_path);
1140 ssize_t len_file = strlen(elf->filename);
1141 if (!strncmp(elf->filename, search_path, len_search) && \
1142 len_file > len_search)
1143 tmp += len_search;
1144 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1145 }
1146 xstrcat(&out_buffer, tmp, &out_len);
1147 break;
1148 case 'f':
1149 found_file = 1;
1150 if (be_wewy_wewy_quiet) break;
1151 tmp = strrchr(elf->filename, '/');
1152 tmp = (tmp == NULL ? elf->filename : tmp+1);
1153 xstrcat(&out_buffer, tmp, &out_len);
1154 break;
1155 case 'o': out = get_elfetype(elf); break;
1156 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
1157 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
1158 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1159 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
1160 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1161 case 'n':
1162 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
1163 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1164 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1165 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
1166 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1167 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1168 default: warnf("'%c' has no scan code?", out_format[i]);
1169 }
1170 if (out) {
1171 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
1172 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
1173 xstrncat(&out_buffer, out, &out_len, (tmp-out));
1174 else
1175 xstrcat(&out_buffer, out, &out_len);
1176 }
1177 }
1178
1179 #define FOUND_SOMETHING() \
1180 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1181 found_rpath || found_needed || found_interp || found_bind || \
1182 found_soname || found_sym || found_lib || found_textrels || found_section )
1183
1184 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1185 xchrcat(&out_buffer, ' ', &out_len);
1186 xstrcat(&out_buffer, elf->filename, &out_len);
1187 }
1188 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
1189 puts(out_buffer);
1190 fflush(stdout);
1191 }
1192
1193 return 0;
1194 }
1195
1196 /* scan a single elf */
1197 static int scanelf_elf(const char *filename, int fd, size_t len)
1198 {
1199 int ret = 1;
1200 elfobj *elf;
1201
1202 /* verify this is real ELF */
1203 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1204 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1205 return ret;
1206 }
1207 switch (match_bits) {
1208 case 32:
1209 if (elf->elf_class != ELFCLASS32)
1210 goto label_done;
1211 break;
1212 case 64:
1213 if (elf->elf_class != ELFCLASS64)
1214 goto label_done;
1215 break;
1216 default: break;
1217 }
1218 if (strlen(match_etypes)) {
1219 char sbuf[126];
1220 strncpy(sbuf, match_etypes, sizeof(sbuf));
1221 if (strchr(match_etypes, ',') != NULL) {
1222 char *p;
1223 while((p = strrchr(sbuf, ',')) != NULL) {
1224 *p = 0;
1225 if (etype_lookup(p+1) == get_etype(elf))
1226 goto label_ret;
1227 }
1228 }
1229 if (etype_lookup(sbuf) != get_etype(elf))
1230 goto label_done;
1231 }
1232
1233 label_ret:
1234 ret = scanelf_elfobj(elf);
1235
1236 label_done:
1237 unreadelf(elf);
1238 return ret;
1239 }
1240
1241 /* scan an archive of elfs */
1242 static int scanelf_archive(const char *filename, int fd, size_t len)
1243 {
1244 archive_handle *ar;
1245 archive_member *m;
1246 char *ar_buffer;
1247 elfobj *elf;
1248
1249 ar = ar_open_fd(filename, fd);
1250 if (ar == NULL)
1251 return 1;
1252
1253 ar_buffer = (char*)mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1254 while ((m=ar_next(ar)) != NULL) {
1255 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size);
1256 if (elf) {
1257 scanelf_elfobj(elf);
1258 unreadelf(elf);
1259 }
1260 }
1261 munmap(ar_buffer, len);
1262
1263 return 0;
1264 }
1265 /* scan a file which may be an elf or an archive or some other magical beast */
1266 static void scanelf_file(const char *filename)
1267 {
1268 struct stat st;
1269 int fd;
1270
1271 /* make sure 'filename' exists */
1272 if (lstat(filename, &st) == -1) {
1273 if (be_verbose > 2) printf("%s: does not exist\n", filename);
1274 return;
1275 }
1276
1277 /* always handle regular files and handle symlinked files if no -y */
1278 if (S_ISLNK(st.st_mode)) {
1279 if (!scan_symlink) return;
1280 stat(filename, &st);
1281 }
1282 if (!S_ISREG(st.st_mode)) {
1283 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1284 return;
1285 }
1286
1287 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1288 return;
1289
1290 if (scanelf_elf(filename, fd, st.st_size) == 1 && scan_archives)
1291 /* if it isn't an ELF, maybe it's an .a archive */
1292 scanelf_archive(filename, fd, st.st_size);
1293
1294 close(fd);
1295 }
1296
1297 /* scan a directory for ET_EXEC files and print when we find one */
1298 static void scanelf_dir(const char *path)
1299 {
1300 register DIR *dir;
1301 register struct dirent *dentry;
1302 struct stat st_top, st;
1303 char buf[__PAX_UTILS_PATH_MAX];
1304 size_t pathlen = 0, len = 0;
1305
1306 /* make sure path exists */
1307 if (lstat(path, &st_top) == -1) {
1308 if (be_verbose > 2) printf("%s: does not exist\n", path);
1309 return;
1310 }
1311
1312 /* ok, if it isn't a directory, assume we can open it */
1313 if (!S_ISDIR(st_top.st_mode)) {
1314 scanelf_file(path);
1315 return;
1316 }
1317
1318 /* now scan the dir looking for fun stuff */
1319 if ((dir = opendir(path)) == NULL) {
1320 warnf("could not opendir %s: %s", path, strerror(errno));
1321 return;
1322 }
1323 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1324
1325 pathlen = strlen(path);
1326 while ((dentry = readdir(dir))) {
1327 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1328 continue;
1329 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
1330 if (len >= sizeof(buf)) {
1331 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1332 (unsigned long)len, (unsigned long)sizeof(buf));
1333 continue;
1334 }
1335 snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name);
1336 if (lstat(buf, &st) != -1) {
1337 if (S_ISREG(st.st_mode))
1338 scanelf_file(buf);
1339 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1340 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1341 scanelf_dir(buf);
1342 }
1343 }
1344 }
1345 closedir(dir);
1346 }
1347
1348 static int scanelf_from_file(const char *filename)
1349 {
1350 FILE *fp = NULL;
1351 char *p;
1352 char path[__PAX_UTILS_PATH_MAX];
1353
1354 if (strcmp(filename, "-") == 0)
1355 fp = stdin;
1356 else if ((fp = fopen(filename, "r")) == NULL)
1357 return 1;
1358
1359 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1360 if ((p = strchr(path, '\n')) != NULL)
1361 *p = 0;
1362 search_path = path;
1363 scanelf_dir(path);
1364 }
1365 if (fp != stdin)
1366 fclose(fp);
1367 return 0;
1368 }
1369
1370 #if defined(__GLIBC__) || defined(__UCLIBC__)
1371
1372 static int load_ld_cache_config(int i, const char *fname)
1373 {
1374 FILE *fp = NULL;
1375 char *p;
1376 char path[__PAX_UTILS_PATH_MAX];
1377
1378 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
1379 return i;
1380
1381 if ((fp = fopen(fname, "r")) == NULL)
1382 return i;
1383
1384 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1385 if ((p = strrchr(path, '\r')) != NULL)
1386 *p = 0;
1387 if ((p = strchr(path, '\n')) != NULL)
1388 *p = 0;
1389 // recursive includes of the same file will make this segfault.
1390 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1391 glob64_t gl;
1392 size_t x;
1393 char gpath[__PAX_UTILS_PATH_MAX];
1394
1395 memset(gpath, 0, sizeof(gpath));
1396
1397 if (path[8] != '/')
1398 snprintf(gpath, sizeof(gpath), "/etc/%s", &path[8]);
1399 else
1400 strncpy(gpath, &path[8], sizeof(gpath));
1401
1402 if ((glob64(gpath, 0, NULL, &gl)) == 0) {
1403 for (x = 0; x < gl.gl_pathc; ++x) {
1404 /* try to avoid direct loops */
1405 if (strcmp(gl.gl_pathv[x], fname) == 0)
1406 continue;
1407 i = load_ld_cache_config(i, gl.gl_pathv[x]);
1408 if (i + 1 >= sizeof(ldpaths) / sizeof(*ldpaths)) {
1409 globfree64(&gl);
1410 return i;
1411 }
1412 }
1413 globfree64 (&gl);
1414 continue;
1415 } else
1416 abort();
1417 }
1418 if (*path != '/')
1419 continue;
1420
1421 ldpaths[i++] = xstrdup(path);
1422
1423 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
1424 break;
1425 }
1426 ldpaths[i] = NULL;
1427
1428 fclose(fp);
1429 return i;
1430 }
1431
1432 #elif defined(__FreeBSD__) || (__DragonFly__)
1433
1434 static int load_ld_cache_config(int i, const char *fname)
1435 {
1436 FILE *fp = NULL;
1437 char *b = NULL, *p;
1438 struct elfhints_hdr hdr;
1439
1440 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
1441 return i;
1442
1443 if ((fp = fopen(fname, "r")) == NULL)
1444 return i;
1445
1446 if ( fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1447 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1448 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1
1449 ) {
1450 fclose(fp);
1451 return i;
1452 }
1453
1454 b = (char*)malloc(hdr.dirlistlen+1);
1455 if ( fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1 ) {
1456 fclose(fp);
1457 free(b);
1458 return i;
1459 }
1460
1461 while ( (p = strsep(&b, ":")) ) {
1462 if ( *p == '\0' ) continue;
1463 ldpaths[i++] = xstrdup(p);
1464
1465 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
1466 break;
1467 }
1468 ldpaths[i] = NULL;
1469
1470 free(b);
1471 fclose(fp);
1472 return i;
1473 }
1474
1475 #else
1476
1477 #warning Cache config support not implemented for your target
1478 static int load_ld_cache_config(int i, const char *fname)
1479 {
1480 memset(ldpaths, 0x00, sizeof(ldpaths));
1481 }
1482
1483 #endif
1484
1485 /* scan /etc/ld.so.conf for paths */
1486 static void scanelf_ldpath()
1487 {
1488 char scan_l, scan_ul, scan_ull;
1489 int i = 0;
1490
1491 if (!ldpaths[0])
1492 err("Unable to load any paths from ld.so.conf");
1493
1494 scan_l = scan_ul = scan_ull = 0;
1495
1496 while (ldpaths[i]) {
1497 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
1498 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
1499 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
1500 scanelf_dir(ldpaths[i]);
1501 ++i;
1502 }
1503
1504 if (!scan_l) scanelf_dir("/lib");
1505 if (!scan_ul) scanelf_dir("/usr/lib");
1506 if (!scan_ull) scanelf_dir("/usr/local/lib");
1507 }
1508
1509 /* scan env PATH for paths */
1510 static void scanelf_envpath()
1511 {
1512 char *path, *p;
1513
1514 path = getenv("PATH");
1515 if (!path)
1516 err("PATH is not set in your env !");
1517 path = xstrdup(path);
1518
1519 while ((p = strrchr(path, ':')) != NULL) {
1520 scanelf_dir(p + 1);
1521 *p = 0;
1522 }
1523
1524 free(path);
1525 }
1526
1527 /* usage / invocation handling functions */
1528 #define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:BhV"
1529 #define a_argument required_argument
1530 static struct option const long_opts[] = {
1531 {"path", no_argument, NULL, 'p'},
1532 {"ldpath", no_argument, NULL, 'l'},
1533 {"recursive", no_argument, NULL, 'R'},
1534 {"mount", no_argument, NULL, 'm'},
1535 {"symlink", no_argument, NULL, 'y'},
1536 {"archives", no_argument, NULL, 'A'},
1537 {"ldcache", no_argument, NULL, 'L'},
1538 {"fix", no_argument, NULL, 'X'},
1539 {"setpax", a_argument, NULL, 'z'},
1540 {"pax", no_argument, NULL, 'x'},
1541 {"header", no_argument, NULL, 'e'},
1542 {"textrel", no_argument, NULL, 't'},
1543 {"rpath", no_argument, NULL, 'r'},
1544 {"needed", no_argument, NULL, 'n'},
1545 {"interp", no_argument, NULL, 'i'},
1546 {"bind", no_argument, NULL, 'b'},
1547 {"soname", no_argument, NULL, 'S'},
1548 {"symbol", a_argument, NULL, 's'},
1549 {"section", a_argument, NULL, 'k'},
1550 {"lib", a_argument, NULL, 'N'},
1551 {"gmatch", no_argument, NULL, 'g'},
1552 {"textrels", no_argument, NULL, 'T'},
1553 {"etype", a_argument, NULL, 'E'},
1554 {"bits", a_argument, NULL, 'M'},
1555 {"all", no_argument, NULL, 'a'},
1556 {"quiet", no_argument, NULL, 'q'},
1557 {"verbose", no_argument, NULL, 'v'},
1558 {"format", a_argument, NULL, 'F'},
1559 {"from", a_argument, NULL, 'f'},
1560 {"file", a_argument, NULL, 'o'},
1561 {"nobanner", no_argument, NULL, 'B'},
1562 {"help", no_argument, NULL, 'h'},
1563 {"version", no_argument, NULL, 'V'},
1564 {NULL, no_argument, NULL, 0x0}
1565 };
1566
1567 static const char *opts_help[] = {
1568 "Scan all directories in PATH environment",
1569 "Scan all directories in /etc/ld.so.conf",
1570 "Scan directories recursively",
1571 "Don't recursively cross mount points",
1572 "Don't scan symlinks",
1573 "Scan archives (.a files)",
1574 "Utilize ld.so.cache information (use with -r/-n)",
1575 "Try and 'fix' bad things (use with -r/-e)",
1576 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1577 "Print PaX markings",
1578 "Print GNU_STACK/PT_LOAD markings",
1579 "Print TEXTREL information",
1580 "Print RPATH information",
1581 "Print NEEDED information",
1582 "Print INTERP information",
1583 "Print BIND information",
1584 "Print SONAME information",
1585 "Find a specified symbol",
1586 "Find a specified section",
1587 "Find a specified library",
1588 "Use strncmp to match libraries. (use with -N)",
1589 "Locate cause of TEXTREL",
1590 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1591 "Print only ELF files matching numeric bits",
1592 "Print all scanned info (-x -e -t -r -b)\n",
1593 "Only output 'bad' things",
1594 "Be verbose (can be specified more than once)",
1595 "Use specified format for output",
1596 "Read input stream from a filename",
1597 "Write output stream to a filename",
1598 "Don't display the header",
1599 "Print this help and exit",
1600 "Print version and exit",
1601 NULL
1602 };
1603
1604 /* display usage and exit */
1605 static void usage(int status)
1606 {
1607 unsigned long i;
1608 printf("* Scan ELF binaries for stuff\n\n"
1609 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1610 printf("Options: -[%s]\n", PARSE_FLAGS);
1611 for (i = 0; long_opts[i].name; ++i)
1612 if (long_opts[i].has_arg == no_argument)
1613 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
1614 long_opts[i].name, opts_help[i]);
1615 else
1616 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
1617 long_opts[i].name, opts_help[i]);
1618
1619 if (status != EXIT_SUCCESS)
1620 exit(status);
1621
1622 puts("\nThe format modifiers for the -F option are:");
1623 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1624 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1625 puts(" i INTERP \tb BIND \ts symbol");
1626 puts(" N library \to Type \tT TEXTRELs");
1627 puts(" S SONAME \tk section");
1628 puts(" p filename (with search path removed)");
1629 puts(" f filename (short name/basename)");
1630 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1631
1632 puts("\nELF Etypes:");
1633 print_etypes(stdout);
1634
1635 exit(status);
1636 }
1637
1638 /* parse command line arguments and preform needed actions */
1639 static void parseargs(int argc, char *argv[])
1640 {
1641 int i;
1642 const char *from_file = NULL;
1643
1644 opterr = 0;
1645 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1646 switch (i) {
1647
1648 case 'V':
1649 printf("pax-utils-%s: %s compiled %s\n%s\n"
1650 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
1651 VERSION, __FILE__, __DATE__, rcsid, argv0);
1652 exit(EXIT_SUCCESS);
1653 break;
1654 case 'h': usage(EXIT_SUCCESS); break;
1655 case 'f':
1656 if (from_file) warn("You prob don't want to specify -f twice");
1657 from_file = optarg;
1658 break;
1659 case 'E':
1660 strncpy(match_etypes, optarg, sizeof(match_etypes));
1661 break;
1662 case 'M':
1663 match_bits = atoi(optarg);
1664 break;
1665 case 'o': {
1666 if (freopen(optarg, "w", stdout) == NULL)
1667 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1668 break;
1669 }
1670 case 'k':
1671 if (find_section) warn("You prob don't want to specify -k twice");
1672 find_section = optarg;
1673 break;
1674 case 's': {
1675 if (find_sym) warn("You prob don't want to specify -s twice");
1676 find_sym = optarg;
1677 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1678 sprintf(versioned_symname, "%s@", find_sym);
1679 break;
1680 }
1681 case 'N': {
1682 if (find_lib) warn("You prob don't want to specify -N twice");
1683 find_lib = optarg;
1684 break;
1685 }
1686
1687 case 'F': {
1688 if (out_format) warn("You prob don't want to specify -F twice");
1689 out_format = optarg;
1690 break;
1691 }
1692 case 'z': {
1693 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1694 size_t x;
1695
1696 for (x = 0 ; x < strlen(optarg); x++) {
1697 switch(optarg[x]) {
1698 case 'p':
1699 case 'P':
1700 do_state(optarg[x], PAGEEXEC);
1701 break;
1702 case 's':
1703 case 'S':
1704 do_state(optarg[x], SEGMEXEC);
1705 break;
1706 case 'm':
1707 case 'M':
1708 do_state(optarg[x], MPROTECT);
1709 break;
1710 case 'e':
1711 case 'E':
1712 do_state(optarg[x], EMUTRAMP);
1713 break;
1714 case 'r':
1715 case 'R':
1716 do_state(optarg[x], RANDMMAP);
1717 break;
1718 case 'x':
1719 case 'X':
1720 do_state(optarg[x], RANDEXEC);
1721 break;
1722 default:
1723 break;
1724 }
1725 }
1726 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
1727 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
1728 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
1729 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
1730 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1731 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1732 setpax = flags;
1733 break;
1734 }
1735 case 'g': gmatch = 1; break;
1736 case 'L': use_ldcache = 1; break;
1737 case 'y': scan_symlink = 0; break;
1738 case 'A': scan_archives = 1; break;
1739 case 'B': show_banner = 0; break;
1740 case 'l': scan_ldpath = 1; break;
1741 case 'p': scan_envpath = 1; break;
1742 case 'R': dir_recurse = 1; break;
1743 case 'm': dir_crossmount = 0; break;
1744 case 'X': ++fix_elf; break;
1745 case 'x': show_pax = 1; break;
1746 case 'e': show_phdr = 1; break;
1747 case 't': show_textrel = 1; break;
1748 case 'r': show_rpath = 1; break;
1749 case 'n': show_needed = 1; break;
1750 case 'i': show_interp = 1; break;
1751 case 'b': show_bind = 1; break;
1752 case 'S': show_soname = 1; break;
1753 case 'T': show_textrels = 1; break;
1754 case 'q': be_quiet = 1; break;
1755 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1756 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
1757
1758 case ':':
1759 err("Option '%c' is missing parameter", optopt);
1760 case '?':
1761 err("Unknown option '%c' or argument missing", optopt);
1762 default:
1763 err("Unhandled option '%c'; please report this", i);
1764 }
1765 }
1766
1767 /* let the format option override all other options */
1768 if (out_format) {
1769 show_pax = show_phdr = show_textrel = show_rpath = \
1770 show_needed = show_interp = show_bind = show_soname = \
1771 show_textrels = 0;
1772 for (i = 0; out_format[i]; ++i) {
1773 if (!IS_MODIFIER(out_format[i])) continue;
1774
1775 switch (out_format[++i]) {
1776 case '+': break;
1777 case '%': break;
1778 case '#': break;
1779 case 'F': break;
1780 case 'p': break;
1781 case 'f': break;
1782 case 'k': break;
1783 case 's': break;
1784 case 'N': break;
1785 case 'o': break;
1786 case 'x': show_pax = 1; break;
1787 case 'e': show_phdr = 1; break;
1788 case 't': show_textrel = 1; break;
1789 case 'r': show_rpath = 1; break;
1790 case 'n': show_needed = 1; break;
1791 case 'i': show_interp = 1; break;
1792 case 'b': show_bind = 1; break;
1793 case 'S': show_soname = 1; break;
1794 case 'T': show_textrels = 1; break;
1795 default:
1796 err("Invalid format specifier '%c' (byte %i)",
1797 out_format[i], i+1);
1798 }
1799 }
1800
1801 /* construct our default format */
1802 } else {
1803 size_t fmt_len = 30;
1804 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
1805 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1806 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1807 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1808 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1809 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1810 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1811 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1812 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1813 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1814 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1815 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1816 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1817 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1818 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1819 }
1820 if (be_verbose > 2) printf("Format: %s\n", out_format);
1821
1822 /* now lets actually do the scanning */
1823 if (scan_ldpath || use_ldcache)
1824 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
1825 if (scan_ldpath) scanelf_ldpath();
1826 if (scan_envpath) scanelf_envpath();
1827 if (!from_file && optind == argc && ttyname(0) == NULL)
1828 from_file = "-";
1829 if (from_file) {
1830 scanelf_from_file(from_file);
1831 from_file = *argv;
1832 }
1833 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1834 err("Nothing to scan !?");
1835 while (optind < argc) {
1836 search_path = argv[optind++];
1837 scanelf_dir(search_path);
1838 }
1839
1840 /* clean up */
1841 if (versioned_symname) free(versioned_symname);
1842 for (i = 0; ldpaths[i]; ++i)
1843 free(ldpaths[i]);
1844
1845 if (ldcache != 0)
1846 munmap(ldcache, ldcache_size);
1847 }
1848
1849 static char **get_split_env(const char *envvar) {
1850 char **envvals = NULL;
1851 char *saveptr = NULL;
1852 char *env;
1853 char *s;
1854 int nentry;
1855
1856 if ((env = getenv(envvar)) == NULL)
1857 return NULL;
1858
1859 env = xstrdup(env);
1860 if (env == NULL)
1861 return NULL;
1862
1863 nentry = 0;
1864 for (s = strtok_r(env, " \t\n", &saveptr); s != NULL; s = strtok_r(NULL, " \t\n", &saveptr)) {
1865 if ((envvals = xrealloc(envvals, sizeof(char *)*(nentry+1))) == NULL)
1866 return NULL;
1867 envvals[nentry++] = s;
1868 }
1869 envvals[nentry] = NULL;
1870
1871 return envvals;
1872 }
1873
1874 static void parseenv() {
1875 qa_textrels=get_split_env("QA_TEXTRELS");
1876 qa_execstack=get_split_env("QA_EXECSTACK");
1877 qa_wx_load=get_split_env("QA_WX_LOAD");
1878 }
1879
1880
1881
1882 int main(int argc, char *argv[])
1883 {
1884 if (argc < 2)
1885 usage(EXIT_FAILURE);
1886 parseenv();
1887 parseargs(argc, argv);
1888 fclose(stdout);
1889 #ifdef __BOUNDS_CHECKING_ON
1890 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()");
1891 #endif
1892 return EXIT_SUCCESS;
1893 }

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