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Revision 1.142 - (show annotations) (download) (as text)
Wed May 10 22:45:08 2006 UTC (7 years, 11 months ago) by kevquinn
Branch: MAIN
Changes since 1.141: +115 -44 lines
File MIME type: text/x-csrc
Process QA_TEXTRELS and QA_EXECSTACK, whitespace-separated lists of
${D}-relative exemptions from textrel and executable stack (i.e. PF_X on
PT_GNU_STACK) checks, so portage can hand this off to scanelf (bug #131779)

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 1.141 2006/04/23 15:24:38 flameeyes Exp $
5 *
6 * Copyright 2003-2006 Ned Ludd - <solar@gentoo.org>
7 * Copyright 2004-2006 Mike Frysinger - <vapier@gentoo.org>
8 */
9
10 #include "paxinc.h"
11 #if defined(__GLIBC__) || defined(__UCLIBC__)
12 #include <glob.h>
13 #endif
14 #if defined(__FreeBSD__) || defined(__DragonFly__)
15 #include <elf-hints.h>
16 #endif
17
18 static const char *rcsid = "$Id: scanelf.c,v 1.141 2006/04/23 15:24:38 flameeyes Exp $";
19 #define argv0 "scanelf"
20
21 #define IS_MODIFIER(c) (c == '%' || c == '#' || c == '+')
22
23 #define do_state(option, flag) \
24 if (islower(option)) { \
25 flags &= ~PF_##flag; \
26 flags |= PF_NO##flag; \
27 } else { \
28 flags &= ~PF_NO##flag; \
29 flags |= PF_##flag; \
30 }
31
32
33 /* prototypes */
34 static int file_matches_list(const char *filename, char **matchlist);
35 static int scanelf_elfobj(elfobj *elf);
36 static int scanelf_elf(const char *filename, int fd, size_t len);
37 static int scanelf_archive(const char *filename, int fd, size_t len);
38 static void scanelf_file(const char *filename);
39 static void scanelf_dir(const char *path);
40 static void scanelf_ldpath(void);
41 static void scanelf_envpath(void);
42 static void usage(int status);
43 static char **get_split_env(const char *envvar);
44 static void parseenv(void);
45 static void parseargs(int argc, char *argv[]);
46 static char *xstrdup(const char *s);
47 static void *xmalloc(size_t size);
48 static void *xrealloc(void *ptr, size_t size);
49 static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n);
50 #define xstrcat(dst,src,curr_len) xstrncat(dst,src,curr_len,0)
51 static inline void xchrcat(char **dst, const char append, size_t *curr_len);
52
53 /* variables to control behavior */
54 static char match_etypes[126] = "";
55 static char *ldpaths[256];
56 static char scan_ldpath = 0;
57 static char scan_envpath = 0;
58 static char scan_symlink = 1;
59 static char scan_archives = 0;
60 static char dir_recurse = 0;
61 static char dir_crossmount = 1;
62 static char show_pax = 0;
63 static char show_phdr = 0;
64 static char show_textrel = 0;
65 static char show_rpath = 0;
66 static char show_needed = 0;
67 static char show_interp = 0;
68 static char show_bind = 0;
69 static char show_soname = 0;
70 static char show_textrels = 0;
71 static char show_banner = 1;
72 static char be_quiet = 0;
73 static char be_verbose = 0;
74 static char be_wewy_wewy_quiet = 0;
75 static char be_semi_verbose = 0;
76 static char *find_sym = NULL, *versioned_symname = NULL;
77 static char *find_lib = NULL;
78 static char *find_section = NULL;
79 static char *out_format = NULL;
80 static char *search_path = NULL;
81 static char fix_elf = 0;
82 static char gmatch = 0;
83 static char use_ldcache = 0;
84
85 static char **qa_textrels = NULL;
86 static char **qa_execstack = NULL;
87
88 int match_bits = 0;
89 caddr_t ldcache = 0;
90 size_t ldcache_size = 0;
91 unsigned long setpax = 0UL;
92
93 /* utility funcs */
94 static char *xstrdup(const char *s)
95 {
96 char *ret = strdup(s);
97 if (!ret) err("Could not strdup(): %s", strerror(errno));
98 return ret;
99 }
100 static void *xmalloc(size_t size)
101 {
102 void *ret = malloc(size);
103 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
104 return ret;
105 }
106 static void *xrealloc(void *ptr, size_t size)
107 {
108 void *ret = realloc(ptr, size);
109 if (!ret) err("Could not realloc() %li bytes", (unsigned long)size);
110 return ret;
111 }
112 static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
113 {
114 size_t new_len;
115
116 new_len = strlen(*dst) + strlen(src);
117 if (*curr_len <= new_len) {
118 *curr_len = new_len + (*curr_len / 2);
119 *dst = realloc(*dst, *curr_len);
120 if (!*dst)
121 err("could not realloc() %li bytes", (unsigned long)*curr_len);
122 }
123
124 if (n)
125 strncat(*dst, src, n);
126 else
127 strcat(*dst, src);
128 }
129 static inline void xchrcat(char **dst, const char append, size_t *curr_len)
130 {
131 static char my_app[2];
132 my_app[0] = append;
133 my_app[1] = '\0';
134 xstrcat(dst, my_app, curr_len);
135 }
136
137 /* Match filename against entries in matchlist, return TRUE
138 * if the file is listed */
139 static int file_matches_list(const char *filename, char **matchlist) {
140 char **file;
141 char *match;
142 char buf[__PAX_UTILS_PATH_MAX];
143 if (matchlist!=NULL) {
144 for (file=matchlist;
145 *file!=NULL;
146 file++) {
147 if (search_path) {
148 snprintf(buf,__PAX_UTILS_PATH_MAX,"%s%s",search_path,*file);
149 match=buf;
150 } else {
151 match=*file;
152 }
153 if (fnmatch(match, filename, 0) == 0)
154 return 1; /* TRUE */
155 }
156 }
157 return 0; /* FALSE */
158 }
159
160 /* sub-funcs for scanelf_file() */
161 static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
162 {
163 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
164 #define GET_SYMTABS(B) \
165 if (elf->elf_class == ELFCLASS ## B) { \
166 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
167 /* debug sections */ \
168 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
169 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
170 /* runtime sections */ \
171 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
172 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
173 if (symtab && dynsym) { \
174 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \
175 } else { \
176 *sym = (void*)(symtab ? symtab : dynsym); \
177 } \
178 if (strtab && dynstr) { \
179 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \
180 } else { \
181 *tab = (void*)(strtab ? strtab : dynstr); \
182 } \
183 }
184 GET_SYMTABS(32)
185 GET_SYMTABS(64)
186 }
187
188 static char *scanelf_file_pax(elfobj *elf, char *found_pax)
189 {
190 static char ret[7];
191 unsigned long i, shown;
192
193 if (!show_pax) return NULL;
194
195 shown = 0;
196 memset(&ret, 0, sizeof(ret));
197
198 if (elf->phdr) {
199 #define SHOW_PAX(B) \
200 if (elf->elf_class == ELFCLASS ## B) { \
201 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
202 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
203 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
204 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
205 continue; \
206 if (fix_elf && setpax) { \
207 /* set the paxctl flags */ \
208 ESET(phdr[i].p_flags, setpax); \
209 } \
210 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
211 continue; \
212 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
213 *found_pax = 1; \
214 ++shown; \
215 break; \
216 } \
217 }
218 SHOW_PAX(32)
219 SHOW_PAX(64)
220 }
221
222
223 if (fix_elf && setpax) {
224 /* set the chpax settings */
225 if (elf->elf_class == ELFCLASS32) {
226 if (EHDR32(elf->ehdr)->e_type == ET_DYN || EHDR32(elf->ehdr)->e_type == ET_EXEC)
227 ESET(EHDR32(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
228 } else {
229 if (EHDR64(elf->ehdr)->e_type == ET_DYN || EHDR64(elf->ehdr)->e_type == ET_EXEC)
230 ESET(EHDR64(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
231 }
232 }
233
234 /* fall back to EI_PAX if no PT_PAX was found */
235 if (!*ret) {
236 static char *paxflags;
237 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
238 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
239 *found_pax = 1;
240 return (be_wewy_wewy_quiet ? NULL : paxflags);
241 }
242 strncpy(ret, paxflags, sizeof(ret));
243 }
244
245 if (be_wewy_wewy_quiet || (be_quiet && !shown))
246 return NULL;
247 else
248 return ret;
249 }
250
251 static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
252 {
253 static char ret[12];
254 char *found;
255 unsigned long i, shown, multi_stack, multi_relro, multi_load;
256 int max_pt_load;
257
258 if (!show_phdr) return NULL;
259
260 memcpy(ret, "--- --- ---\0", 12);
261
262 shown = 0;
263 multi_stack = multi_relro = multi_load = 0;
264 max_pt_load = elf_max_pt_load(elf);
265
266 #define NOTE_GNU_STACK ".note.GNU-stack"
267 #define SHOW_PHDR(B) \
268 if (elf->elf_class == ELFCLASS ## B) { \
269 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
270 Elf ## B ## _Off offset; \
271 uint32_t flags, check_flags; \
272 if (elf->phdr != NULL) { \
273 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
274 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
275 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
276 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
277 if (!file_matches_list(elf->filename, qa_execstack)) {\
278 found = found_phdr; \
279 offset = 0; \
280 check_flags = PF_X; \
281 } else continue; \
282 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
283 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
284 found = found_relro; \
285 offset = 4; \
286 check_flags = PF_X; \
287 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
288 if (ehdr->e_type == ET_DYN || ehdr->e_type == ET_EXEC) \
289 if (multi_load++ > max_pt_load) warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
290 found = found_load; \
291 offset = 8; \
292 check_flags = PF_W|PF_X; \
293 } else \
294 continue; \
295 flags = EGET(phdr[i].p_flags); \
296 if (be_quiet && ((flags & check_flags) != check_flags)) \
297 continue; \
298 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
299 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
300 ret[3] = ret[7] = '!'; \
301 flags = EGET(phdr[i].p_flags); \
302 } \
303 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
304 *found = 1; \
305 ++shown; \
306 } \
307 } else if (elf->shdr != NULL) { \
308 /* no program headers which means this is prob an object file */ \
309 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
310 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
311 char *str; \
312 if ((void*)strtbl > (void*)elf->data_end) \
313 goto skip_this_shdr##B; \
314 check_flags = SHF_WRITE|SHF_EXECINSTR; \
315 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
316 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
317 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
318 str = elf->data + offset; \
319 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
320 if (!strcmp(str, NOTE_GNU_STACK)) { \
321 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
322 flags = EGET(shdr[i].sh_flags); \
323 if (be_quiet && ((flags & check_flags) != check_flags)) \
324 continue; \
325 ++*found_phdr; \
326 shown = 1; \
327 if (flags & SHF_WRITE) ret[0] = 'W'; \
328 if (flags & SHF_ALLOC) ret[1] = 'A'; \
329 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
330 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
331 break; \
332 } \
333 } \
334 skip_this_shdr##B: \
335 if (!multi_stack) { \
336 *found_phdr = 1; \
337 shown = 1; \
338 memcpy(ret, "!WX", 3); \
339 } \
340 } \
341 }
342 SHOW_PHDR(32)
343 SHOW_PHDR(64)
344
345 if (be_wewy_wewy_quiet || (be_quiet && !shown))
346 return NULL;
347 else
348 return ret;
349 }
350
351 static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
352 {
353 static const char *ret = "TEXTREL";
354 unsigned long i;
355
356 if (!show_textrel && !show_textrels) return NULL;
357
358 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
359
360 if (elf->phdr) {
361 #define SHOW_TEXTREL(B) \
362 if (elf->elf_class == ELFCLASS ## B) { \
363 Elf ## B ## _Dyn *dyn; \
364 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
365 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
366 Elf ## B ## _Off offset; \
367 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
368 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
369 offset = EGET(phdr[i].p_offset); \
370 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
371 dyn = DYN ## B (elf->data + offset); \
372 while (EGET(dyn->d_tag) != DT_NULL) { \
373 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
374 *found_textrel = 1; \
375 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
376 return (be_wewy_wewy_quiet ? NULL : ret); \
377 } \
378 ++dyn; \
379 } \
380 } }
381 SHOW_TEXTREL(32)
382 SHOW_TEXTREL(64)
383 }
384
385 if (be_quiet || be_wewy_wewy_quiet)
386 return NULL;
387 else
388 return " - ";
389 }
390 static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
391 {
392 unsigned long s, r, rmax;
393 void *symtab_void, *strtab_void, *text_void;
394
395 if (!show_textrels) return NULL;
396
397 /* don't search for TEXTREL's if the ELF doesn't have any */
398 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
399 if (!*found_textrel) return NULL;
400
401 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
402 text_void = elf_findsecbyname(elf, ".text");
403
404 if (symtab_void && strtab_void && text_void && elf->shdr) {
405 #define SHOW_TEXTRELS(B) \
406 if (elf->elf_class == ELFCLASS ## B) { \
407 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
408 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
409 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
410 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
411 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
412 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
413 uint ## B ## _t memsz = EGET(text->sh_size); \
414 Elf ## B ## _Rel *rel; \
415 Elf ## B ## _Rela *rela; \
416 /* search the section headers for relocations */ \
417 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
418 uint32_t sh_type = EGET(shdr[s].sh_type); \
419 if (sh_type == SHT_REL) { \
420 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \
421 rela = NULL; \
422 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
423 } else if (sh_type == SHT_RELA) { \
424 rel = NULL; \
425 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \
426 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
427 } else \
428 continue; \
429 /* now see if any of the relocs are in the .text */ \
430 for (r = 0; r < rmax; ++r) { \
431 unsigned long sym_max; \
432 Elf ## B ## _Addr offset_tmp; \
433 Elf ## B ## _Sym *func; \
434 Elf ## B ## _Sym *sym; \
435 Elf ## B ## _Addr r_offset; \
436 uint ## B ## _t r_info; \
437 if (sh_type == SHT_REL) { \
438 r_offset = EGET(rel[r].r_offset); \
439 r_info = EGET(rel[r].r_info); \
440 } else { \
441 r_offset = EGET(rela[r].r_offset); \
442 r_info = EGET(rela[r].r_info); \
443 } \
444 /* make sure this relocation is inside of the .text */ \
445 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
446 if (be_verbose <= 2) continue; \
447 } else \
448 *found_textrels = 1; \
449 /* locate this relocation symbol name */ \
450 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
451 if ((void*)sym > (void*)elf->data_end) { \
452 warn("%s: corrupt ELF symbol", elf->filename); \
453 continue; \
454 } \
455 sym_max = ELF ## B ## _R_SYM(r_info); \
456 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
457 sym += sym_max; \
458 else \
459 sym = NULL; \
460 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
461 /* show the raw details about this reloc */ \
462 printf(" %s: ", elf->base_filename); \
463 if (sym && sym->st_name) \
464 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \
465 else \
466 printf("(memory/fake?)"); \
467 printf(" [0x%lX]", (unsigned long)r_offset); \
468 /* now try to find the closest symbol that this rel is probably in */ \
469 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
470 func = NULL; \
471 offset_tmp = 0; \
472 while (sym_max--) { \
473 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
474 func = sym; \
475 offset_tmp = EGET(sym->st_value); \
476 } \
477 ++sym; \
478 } \
479 printf(" in "); \
480 if (func && func->st_name) \
481 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \
482 else \
483 printf("(NULL: fake?)"); \
484 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
485 } \
486 } }
487 SHOW_TEXTRELS(32)
488 SHOW_TEXTRELS(64)
489 }
490 if (!*found_textrels)
491 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
492
493 return NULL;
494 }
495
496 static void rpath_security_checks(elfobj *, char *, const char *);
497 static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
498 {
499 struct stat st;
500 switch (*item) {
501 case '/': break;
502 case '.':
503 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
504 break;
505 case ':':
506 case '\0':
507 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
508 break;
509 case '$':
510 if (fstat(elf->fd, &st) != -1)
511 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
512 warnf("Security problem with %s='%s' in %s with mode set of %o",
513 dt_type, item, elf->filename, st.st_mode & 07777);
514 break;
515 default:
516 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
517 break;
518 }
519 }
520 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
521 {
522 unsigned long i, s;
523 char *rpath, *runpath, **r;
524 void *strtbl_void;
525
526 if (!show_rpath) return;
527
528 strtbl_void = elf_findsecbyname(elf, ".dynstr");
529 rpath = runpath = NULL;
530
531 if (elf->phdr && strtbl_void) {
532 #define SHOW_RPATH(B) \
533 if (elf->elf_class == ELFCLASS ## B) { \
534 Elf ## B ## _Dyn *dyn; \
535 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
536 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
537 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
538 Elf ## B ## _Off offset; \
539 Elf ## B ## _Xword word; \
540 /* Scan all the program headers */ \
541 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
542 /* Just scan dynamic headers */ \
543 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
544 offset = EGET(phdr[i].p_offset); \
545 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
546 /* Just scan dynamic RPATH/RUNPATH headers */ \
547 dyn = DYN ## B (elf->data + offset); \
548 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
549 if (word == DT_RPATH) { \
550 r = &rpath; \
551 } else if (word == DT_RUNPATH) { \
552 r = &runpath; \
553 } else { \
554 ++dyn; \
555 continue; \
556 } \
557 /* Verify the memory is somewhat sane */ \
558 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
559 if (offset < (Elf ## B ## _Off)elf->len) { \
560 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
561 *r = (char*)(elf->data + offset); \
562 /* cache the length in case we need to nuke this section later on */ \
563 if (fix_elf) \
564 offset = strlen(*r); \
565 /* If quiet, don't output paths in ld.so.conf */ \
566 if (be_quiet) { \
567 size_t len; \
568 char *start, *end; \
569 /* note that we only 'chop' off leading known paths. */ \
570 /* since *r is read-only memory, we can only move the ptr forward. */ \
571 start = *r; \
572 /* scan each path in : delimited list */ \
573 while (start) { \
574 rpath_security_checks(elf, start, get_elfdtype(word)); \
575 end = strchr(start, ':'); \
576 len = (end ? abs(end - start) : strlen(start)); \
577 if (use_ldcache) \
578 for (s = 0; ldpaths[s]; ++s) \
579 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
580 *r = end; \
581 /* corner case ... if RPATH reads "/usr/lib:", we want \
582 * to show ':' rather than '' */ \
583 if (end && end[1] != '\0') \
584 (*r)++; \
585 break; \
586 } \
587 if (!*r || !end) \
588 break; \
589 else \
590 start = start + len + 1; \
591 } \
592 } \
593 if (*r) { \
594 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
595 /* just nuke it */ \
596 nuke_it##B: \
597 memset(*r, 0x00, offset); \
598 *r = NULL; \
599 ESET(dyn->d_tag, DT_DEBUG); \
600 ESET(dyn->d_un.d_ptr, 0); \
601 } else if (fix_elf) { \
602 /* try to clean "bad" paths */ \
603 size_t len, tmpdir_len; \
604 char *start, *end; \
605 const char *tmpdir; \
606 start = *r; \
607 tmpdir = (getenv("TMPDIR") ? : "."); \
608 tmpdir_len = strlen(tmpdir); \
609 while (1) { \
610 end = strchr(start, ':'); \
611 if (start == end) { \
612 eat_this_path##B: \
613 len = strlen(end); \
614 memmove(start, end+1, len); \
615 start[len-1] = '\0'; \
616 end = start - 1; \
617 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
618 if (!end) { \
619 if (start == *r) \
620 goto nuke_it##B; \
621 *--start = '\0'; \
622 } else \
623 goto eat_this_path##B; \
624 } \
625 if (!end) \
626 break; \
627 start = end + 1; \
628 } \
629 if (**r == '\0') \
630 goto nuke_it##B; \
631 } \
632 if (*r) \
633 *found_rpath = 1; \
634 } \
635 } \
636 ++dyn; \
637 } \
638 } }
639 SHOW_RPATH(32)
640 SHOW_RPATH(64)
641 }
642
643 if (be_wewy_wewy_quiet) return;
644
645 if (rpath && runpath) {
646 if (!strcmp(rpath, runpath)) {
647 xstrcat(ret, runpath, ret_len);
648 } else {
649 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
650 xchrcat(ret, '{', ret_len);
651 xstrcat(ret, rpath, ret_len);
652 xchrcat(ret, ',', ret_len);
653 xstrcat(ret, runpath, ret_len);
654 xchrcat(ret, '}', ret_len);
655 }
656 } else if (rpath || runpath)
657 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
658 else if (!be_quiet)
659 xstrcat(ret, " - ", ret_len);
660 }
661
662 #define LDSO_CACHE_MAGIC "ld.so-"
663 #define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
664 #define LDSO_CACHE_VER "1.7.0"
665 #define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
666 #define FLAG_ANY -1
667 #define FLAG_TYPE_MASK 0x00ff
668 #define FLAG_LIBC4 0x0000
669 #define FLAG_ELF 0x0001
670 #define FLAG_ELF_LIBC5 0x0002
671 #define FLAG_ELF_LIBC6 0x0003
672 #define FLAG_REQUIRED_MASK 0xff00
673 #define FLAG_SPARC_LIB64 0x0100
674 #define FLAG_IA64_LIB64 0x0200
675 #define FLAG_X8664_LIB64 0x0300
676 #define FLAG_S390_LIB64 0x0400
677 #define FLAG_POWERPC_LIB64 0x0500
678 #define FLAG_MIPS64_LIBN32 0x0600
679 #define FLAG_MIPS64_LIBN64 0x0700
680
681 static char *lookup_cache_lib(elfobj *, char *);
682 #if defined(__GLIBC__) || defined(__UCLIBC__)
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 #else
749 #warning Cache support not implemented for your current 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 (strcmp(symname, 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 sprintf(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 static int load_ld_so_conf(int i, const char *fname)
1372 {
1373 FILE *fp = NULL;
1374 char *p;
1375 char path[__PAX_UTILS_PATH_MAX];
1376
1377 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
1378 return i;
1379
1380 if ((fp = fopen(fname, "r")) == NULL)
1381 return i;
1382
1383 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1384 if ((p = strrchr(path, '\r')) != NULL)
1385 *p = 0;
1386 if ((p = strchr(path, '\n')) != NULL)
1387 *p = 0;
1388 // recursive includes of the same file will make this segfault.
1389 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1390 glob64_t gl;
1391 size_t x;
1392 char gpath[__PAX_UTILS_PATH_MAX];
1393
1394 memset(gpath, 0, sizeof(gpath));
1395
1396 if (path[8] != '/')
1397 snprintf(gpath, sizeof(gpath), "/etc/%s", &path[8]);
1398 else
1399 strncpy(gpath, &path[8], sizeof(gpath));
1400
1401 if ((glob64(gpath, 0, NULL, &gl)) == 0) {
1402 for (x = 0; x < gl.gl_pathc; ++x) {
1403 /* try to avoid direct loops */
1404 if (strcmp(gl.gl_pathv[x], fname) == 0)
1405 continue;
1406 i = load_ld_so_conf(i, gl.gl_pathv[x]);
1407 if (i + 1 >= sizeof(ldpaths) / sizeof(*ldpaths)) {
1408 globfree64(&gl);
1409 return i;
1410 }
1411 }
1412 globfree64 (&gl);
1413 continue;
1414 } else
1415 abort();
1416 }
1417 if (*path != '/')
1418 continue;
1419
1420 ldpaths[i++] = xstrdup(path);
1421
1422 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
1423 break;
1424 }
1425 ldpaths[i] = NULL;
1426
1427 fclose(fp);
1428 return i;
1429 }
1430 #endif
1431
1432 #if defined(__FreeBSD__) || (__DragonFly__)
1433 static int load_ld_so_hints(int i, const char *fname)
1434 {
1435 FILE *fp = NULL;
1436 char *b = NULL, *p;
1437 struct elfhints_hdr hdr;
1438
1439 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
1440 return i;
1441
1442 if ((fp = fopen(fname, "r")) == NULL)
1443 return i;
1444
1445 if ( fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1446 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1447 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1
1448 ) {
1449 fclose(fp);
1450 return i;
1451 }
1452
1453 b = (char*)malloc(hdr.dirlistlen+1);
1454 if ( fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1 ) {
1455 fclose(fp);
1456 free(b);
1457 return i;
1458 }
1459
1460 while ( (p = strsep(&b, ":")) ) {
1461 if ( *p == '\0' ) continue;
1462 ldpaths[i++] = xstrdup(p);
1463
1464 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
1465 break;
1466 }
1467 ldpaths[i] = NULL;
1468
1469 free(b);
1470 fclose(fp);
1471 return i;
1472 }
1473 #endif
1474
1475 /* scan /etc/ld.so.conf for paths */
1476 static void scanelf_ldpath()
1477 {
1478 char scan_l, scan_ul, scan_ull;
1479 int i = 0;
1480
1481 if (!ldpaths[0])
1482 err("Unable to load any paths from ld.so.conf");
1483
1484 scan_l = scan_ul = scan_ull = 0;
1485
1486 while (ldpaths[i]) {
1487 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
1488 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
1489 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
1490 scanelf_dir(ldpaths[i]);
1491 ++i;
1492 }
1493
1494 if (!scan_l) scanelf_dir("/lib");
1495 if (!scan_ul) scanelf_dir("/usr/lib");
1496 if (!scan_ull) scanelf_dir("/usr/local/lib");
1497 }
1498
1499 /* scan env PATH for paths */
1500 static void scanelf_envpath()
1501 {
1502 char *path, *p;
1503
1504 path = getenv("PATH");
1505 if (!path)
1506 err("PATH is not set in your env !");
1507 path = xstrdup(path);
1508
1509 while ((p = strrchr(path, ':')) != NULL) {
1510 scanelf_dir(p + 1);
1511 *p = 0;
1512 }
1513
1514 free(path);
1515 }
1516
1517 /* usage / invocation handling functions */
1518 #define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:BhV"
1519 #define a_argument required_argument
1520 static struct option const long_opts[] = {
1521 {"path", no_argument, NULL, 'p'},
1522 {"ldpath", no_argument, NULL, 'l'},
1523 {"recursive", no_argument, NULL, 'R'},
1524 {"mount", no_argument, NULL, 'm'},
1525 {"symlink", no_argument, NULL, 'y'},
1526 {"archives", no_argument, NULL, 'A'},
1527 {"ldcache", no_argument, NULL, 'L'},
1528 {"fix", no_argument, NULL, 'X'},
1529 {"setpax", a_argument, NULL, 'z'},
1530 {"pax", no_argument, NULL, 'x'},
1531 {"header", no_argument, NULL, 'e'},
1532 {"textrel", no_argument, NULL, 't'},
1533 {"rpath", no_argument, NULL, 'r'},
1534 {"needed", no_argument, NULL, 'n'},
1535 {"interp", no_argument, NULL, 'i'},
1536 {"bind", no_argument, NULL, 'b'},
1537 {"soname", no_argument, NULL, 'S'},
1538 {"symbol", a_argument, NULL, 's'},
1539 {"section", a_argument, NULL, 'k'},
1540 {"lib", a_argument, NULL, 'N'},
1541 {"gmatch", no_argument, NULL, 'g'},
1542 {"textrels", no_argument, NULL, 'T'},
1543 {"etype", a_argument, NULL, 'E'},
1544 {"bits", a_argument, NULL, 'M'},
1545 {"all", no_argument, NULL, 'a'},
1546 {"quiet", no_argument, NULL, 'q'},
1547 {"verbose", no_argument, NULL, 'v'},
1548 {"format", a_argument, NULL, 'F'},
1549 {"from", a_argument, NULL, 'f'},
1550 {"file", a_argument, NULL, 'o'},
1551 {"nobanner", no_argument, NULL, 'B'},
1552 {"help", no_argument, NULL, 'h'},
1553 {"version", no_argument, NULL, 'V'},
1554 {NULL, no_argument, NULL, 0x0}
1555 };
1556
1557 static const char *opts_help[] = {
1558 "Scan all directories in PATH environment",
1559 "Scan all directories in /etc/ld.so.conf",
1560 "Scan directories recursively",
1561 "Don't recursively cross mount points",
1562 "Don't scan symlinks",
1563 "Scan archives (.a files)",
1564 "Utilize ld.so.cache information (use with -r/-n)",
1565 "Try and 'fix' bad things (use with -r/-e)",
1566 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1567 "Print PaX markings",
1568 "Print GNU_STACK/PT_LOAD markings",
1569 "Print TEXTREL information",
1570 "Print RPATH information",
1571 "Print NEEDED information",
1572 "Print INTERP information",
1573 "Print BIND information",
1574 "Print SONAME information",
1575 "Find a specified symbol",
1576 "Find a specified section",
1577 "Find a specified library",
1578 "Use strncmp to match libraries. (use with -N)",
1579 "Locate cause of TEXTREL",
1580 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1581 "Print only ELF files matching numeric bits",
1582 "Print all scanned info (-x -e -t -r -b)\n",
1583 "Only output 'bad' things",
1584 "Be verbose (can be specified more than once)",
1585 "Use specified format for output",
1586 "Read input stream from a filename",
1587 "Write output stream to a filename",
1588 "Don't display the header",
1589 "Print this help and exit",
1590 "Print version and exit",
1591 NULL
1592 };
1593
1594 /* display usage and exit */
1595 static void usage(int status)
1596 {
1597 unsigned long i;
1598 printf("* Scan ELF binaries for stuff\n\n"
1599 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1600 printf("Options: -[%s]\n", PARSE_FLAGS);
1601 for (i = 0; long_opts[i].name; ++i)
1602 if (long_opts[i].has_arg == no_argument)
1603 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
1604 long_opts[i].name, opts_help[i]);
1605 else
1606 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
1607 long_opts[i].name, opts_help[i]);
1608
1609 if (status != EXIT_SUCCESS)
1610 exit(status);
1611
1612 puts("\nThe format modifiers for the -F option are:");
1613 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1614 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1615 puts(" i INTERP \tb BIND \ts symbol");
1616 puts(" N library \to Type \tT TEXTRELs");
1617 puts(" S SONAME \tk section");
1618 puts(" p filename (with search path removed)");
1619 puts(" f filename (short name/basename)");
1620 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1621
1622 puts("\nELF Etypes:");
1623 print_etypes(stdout);
1624
1625 exit(status);
1626 }
1627
1628 /* parse command line arguments and preform needed actions */
1629 static void parseargs(int argc, char *argv[])
1630 {
1631 int i;
1632 const char *from_file = NULL;
1633
1634 opterr = 0;
1635 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1636 switch (i) {
1637
1638 case 'V':
1639 printf("pax-utils-%s: %s compiled %s\n%s\n"
1640 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
1641 VERSION, __FILE__, __DATE__, rcsid, argv0);
1642 exit(EXIT_SUCCESS);
1643 break;
1644 case 'h': usage(EXIT_SUCCESS); break;
1645 case 'f':
1646 if (from_file) warn("You prob don't want to specify -f twice");
1647 from_file = optarg;
1648 break;
1649 case 'E':
1650 strncpy(match_etypes, optarg, sizeof(match_etypes));
1651 break;
1652 case 'M':
1653 match_bits = atoi(optarg);
1654 break;
1655 case 'o': {
1656 FILE *fp = NULL;
1657 if ((fp = freopen(optarg, "w", stdout)) == NULL)
1658 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1659 SET_STDOUT(fp);
1660 break;
1661 }
1662 case 'k':
1663 if (find_section) warn("You prob don't want to specify -k twice");
1664 find_section = optarg;
1665 break;
1666 case 's': {
1667 if (find_sym) warn("You prob don't want to specify -s twice");
1668 find_sym = optarg;
1669 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1670 sprintf(versioned_symname, "%s@", find_sym);
1671 break;
1672 }
1673 case 'N': {
1674 if (find_lib) warn("You prob don't want to specify -N twice");
1675 find_lib = optarg;
1676 break;
1677 }
1678
1679 case 'F': {
1680 if (out_format) warn("You prob don't want to specify -F twice");
1681 out_format = optarg;
1682 break;
1683 }
1684 case 'z': {
1685 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1686 size_t x;
1687
1688 for (x = 0 ; x < strlen(optarg); x++) {
1689 switch(optarg[x]) {
1690 case 'p':
1691 case 'P':
1692 do_state(optarg[x], PAGEEXEC);
1693 break;
1694 case 's':
1695 case 'S':
1696 do_state(optarg[x], SEGMEXEC);
1697 break;
1698 case 'm':
1699 case 'M':
1700 do_state(optarg[x], MPROTECT);
1701 break;
1702 case 'e':
1703 case 'E':
1704 do_state(optarg[x], EMUTRAMP);
1705 break;
1706 case 'r':
1707 case 'R':
1708 do_state(optarg[x], RANDMMAP);
1709 break;
1710 case 'x':
1711 case 'X':
1712 do_state(optarg[x], RANDEXEC);
1713 break;
1714 default:
1715 break;
1716 }
1717 }
1718 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
1719 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
1720 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
1721 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
1722 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1723 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1724 setpax = flags;
1725 break;
1726 }
1727 case 'g': gmatch = 1; break;
1728 case 'L': use_ldcache = 1; break;
1729 case 'y': scan_symlink = 0; break;
1730 case 'A': scan_archives = 1; break;
1731 case 'B': show_banner = 0; break;
1732 case 'l': scan_ldpath = 1; break;
1733 case 'p': scan_envpath = 1; break;
1734 case 'R': dir_recurse = 1; break;
1735 case 'm': dir_crossmount = 0; break;
1736 case 'X': ++fix_elf; break;
1737 case 'x': show_pax = 1; break;
1738 case 'e': show_phdr = 1; break;
1739 case 't': show_textrel = 1; break;
1740 case 'r': show_rpath = 1; break;
1741 case 'n': show_needed = 1; break;
1742 case 'i': show_interp = 1; break;
1743 case 'b': show_bind = 1; break;
1744 case 'S': show_soname = 1; break;
1745 case 'T': show_textrels = 1; break;
1746 case 'q': be_quiet = 1; break;
1747 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1748 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
1749
1750 case ':':
1751 err("Option '%c' is missing parameter", optopt);
1752 case '?':
1753 err("Unknown option '%c' or argument missing", optopt);
1754 default:
1755 err("Unhandled option '%c'; please report this", i);
1756 }
1757 }
1758
1759 /* let the format option override all other options */
1760 if (out_format) {
1761 show_pax = show_phdr = show_textrel = show_rpath = \
1762 show_needed = show_interp = show_bind = show_soname = \
1763 show_textrels = 0;
1764 for (i = 0; out_format[i]; ++i) {
1765 if (!IS_MODIFIER(out_format[i])) continue;
1766
1767 switch (out_format[++i]) {
1768 case '+': break;
1769 case '%': break;
1770 case '#': break;
1771 case 'F': break;
1772 case 'p': break;
1773 case 'f': break;
1774 case 'k': break;
1775 case 's': break;
1776 case 'N': break;
1777 case 'o': break;
1778 case 'x': show_pax = 1; break;
1779 case 'e': show_phdr = 1; break;
1780 case 't': show_textrel = 1; break;
1781 case 'r': show_rpath = 1; break;
1782 case 'n': show_needed = 1; break;
1783 case 'i': show_interp = 1; break;
1784 case 'b': show_bind = 1; break;
1785 case 'S': show_soname = 1; break;
1786 case 'T': show_textrels = 1; break;
1787 default:
1788 err("Invalid format specifier '%c' (byte %i)",
1789 out_format[i], i+1);
1790 }
1791 }
1792
1793 /* construct our default format */
1794 } else {
1795 size_t fmt_len = 30;
1796 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
1797 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1798 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1799 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1800 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1801 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1802 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1803 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1804 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1805 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1806 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1807 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1808 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1809 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1810 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1811 }
1812 if (be_verbose > 2) printf("Format: %s\n", out_format);
1813
1814 /* now lets actually do the scanning */
1815 if (scan_ldpath || use_ldcache)
1816 #if defined(__GLIBC__) || defined(__UCLIBC__)
1817 load_ld_so_conf(0, "/etc/ld.so.conf");
1818 #elif defined(__FreeBSD__) || defined(__DragonFly__)
1819 load_ld_so_hints(0, _PATH_ELF_HINTS);
1820 #endif
1821 if (scan_ldpath) scanelf_ldpath();
1822 if (scan_envpath) scanelf_envpath();
1823 if (!from_file && optind == argc && ttyname(0) == NULL)
1824 from_file = "-";
1825 if (from_file) {
1826 scanelf_from_file(from_file);
1827 from_file = *argv;
1828 }
1829 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1830 err("Nothing to scan !?");
1831 while (optind < argc) {
1832 search_path = argv[optind++];
1833 scanelf_dir(search_path);
1834 }
1835
1836 /* clean up */
1837 if (versioned_symname) free(versioned_symname);
1838 for (i = 0; ldpaths[i]; ++i)
1839 free(ldpaths[i]);
1840
1841 if (ldcache != 0)
1842 munmap(ldcache, ldcache_size);
1843 }
1844
1845 static char **get_split_env(const char *envvar) {
1846 char **envvals=NULL;
1847 char *saveptr=NULL;
1848 char *env;
1849 char *s;
1850 int nentry;
1851
1852 env=getenv(envvar);
1853 if (env==NULL) return NULL;
1854
1855 env=xstrdup(env);
1856 if (env==NULL) return NULL;
1857
1858 nentry=0;
1859 for (s=strtok_r(env, " \t\n", &saveptr);
1860 s!=NULL;
1861 s=strtok_r(NULL, " \t\n", &saveptr)) {
1862 envvals=xrealloc(envvals, sizeof(char *)*(nentry+1));
1863 if (envvals==NULL) return NULL;
1864 envvals[nentry++]=s;
1865 }
1866 envvals[nentry]=NULL;
1867
1868 return envvals;
1869 }
1870
1871 static void parseenv() {
1872 qa_textrels=get_split_env("QA_TEXTRELS");
1873 qa_execstack=get_split_env("QA_EXECSTACK");
1874 }
1875
1876
1877
1878 int main(int argc, char *argv[])
1879 {
1880 if (argc < 2)
1881 usage(EXIT_FAILURE);
1882 parseenv();
1883 parseargs(argc, argv);
1884 fclose(stdout);
1885 #ifdef __BOUNDS_CHECKING_ON
1886 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()");
1887 #endif
1888 return EXIT_SUCCESS;
1889 }

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