/[gentoo-projects]/pax-utils/scanelf.c
Gentoo

Contents of /pax-utils/scanelf.c

Parent Directory Parent Directory | Revision Log Revision Log


Revision 1.158 - (show annotations) (download) (as text)
Fri Aug 25 06:32:08 2006 UTC (7 years, 10 months ago) by vapier
Branch: MAIN
Changes since 1.157: +2 -0 lines
File MIME type: text/x-csrc
make sure we check QA_EXECSTACKS when .o objects are missing .note.GNU-stack #144986

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 1.156 2006/06/11 00:23:11 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 1.156 2006/06/11 00:23:11 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
89
90 /* sub-funcs for scanelf_file() */
91 static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
92 {
93 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
94 #define GET_SYMTABS(B) \
95 if (elf->elf_class == ELFCLASS ## B) { \
96 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
97 /* debug sections */ \
98 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
99 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
100 /* runtime sections */ \
101 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
102 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
103 if (symtab && dynsym) { \
104 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \
105 } else { \
106 *sym = (void*)(symtab ? symtab : dynsym); \
107 } \
108 if (strtab && dynstr) { \
109 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \
110 } else { \
111 *tab = (void*)(strtab ? strtab : dynstr); \
112 } \
113 }
114 GET_SYMTABS(32)
115 GET_SYMTABS(64)
116 }
117
118 static char *scanelf_file_pax(elfobj *elf, char *found_pax)
119 {
120 static char ret[7];
121 unsigned long i, shown;
122
123 if (!show_pax) return NULL;
124
125 shown = 0;
126 memset(&ret, 0, sizeof(ret));
127
128 if (elf->phdr) {
129 #define SHOW_PAX(B) \
130 if (elf->elf_class == ELFCLASS ## B) { \
131 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
132 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
133 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
134 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
135 continue; \
136 if (fix_elf && setpax) { \
137 /* set the paxctl flags */ \
138 ESET(phdr[i].p_flags, setpax); \
139 } \
140 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
141 continue; \
142 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
143 *found_pax = 1; \
144 ++shown; \
145 break; \
146 } \
147 }
148 SHOW_PAX(32)
149 SHOW_PAX(64)
150 }
151
152
153 if (fix_elf && setpax) {
154 /* set the chpax settings */
155 if (elf->elf_class == ELFCLASS32) {
156 if (EHDR32(elf->ehdr)->e_type == ET_DYN || EHDR32(elf->ehdr)->e_type == ET_EXEC)
157 ESET(EHDR32(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
158 } else {
159 if (EHDR64(elf->ehdr)->e_type == ET_DYN || EHDR64(elf->ehdr)->e_type == ET_EXEC)
160 ESET(EHDR64(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
161 }
162 }
163
164 /* fall back to EI_PAX if no PT_PAX was found */
165 if (!*ret) {
166 static char *paxflags;
167 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
168 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
169 *found_pax = 1;
170 return (be_wewy_wewy_quiet ? NULL : paxflags);
171 }
172 strncpy(ret, paxflags, sizeof(ret));
173 }
174
175 if (be_wewy_wewy_quiet || (be_quiet && !shown))
176 return NULL;
177 else
178 return ret;
179 }
180
181 static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
182 {
183 static char ret[12];
184 char *found;
185 unsigned long i, shown, multi_stack, multi_relro, multi_load;
186 int max_pt_load;
187
188 if (!show_phdr) return NULL;
189
190 memcpy(ret, "--- --- ---\0", 12);
191
192 shown = 0;
193 multi_stack = multi_relro = multi_load = 0;
194 max_pt_load = elf_max_pt_load(elf);
195
196 #define NOTE_GNU_STACK ".note.GNU-stack"
197 #define SHOW_PHDR(B) \
198 if (elf->elf_class == ELFCLASS ## B) { \
199 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
200 Elf ## B ## _Off offset; \
201 uint32_t flags, check_flags; \
202 if (elf->phdr != NULL) { \
203 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
204 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
205 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
206 if (multi_stack++) \
207 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
208 if (file_matches_list(elf->filename, qa_execstack)) \
209 continue; \
210 found = found_phdr; \
211 offset = 0; \
212 check_flags = PF_X; \
213 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
214 if (multi_relro++) \
215 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
216 found = found_relro; \
217 offset = 4; \
218 check_flags = PF_X; \
219 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
220 if (ehdr->e_type == ET_DYN || ehdr->e_type == ET_EXEC) \
221 if (multi_load++ > max_pt_load) \
222 warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
223 if (file_matches_list(elf->filename, qa_wx_load)) \
224 continue; \
225 found = found_load; \
226 offset = 8; \
227 check_flags = PF_W|PF_X; \
228 } else \
229 continue; \
230 flags = EGET(phdr[i].p_flags); \
231 if (be_quiet && ((flags & check_flags) != check_flags)) \
232 continue; \
233 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
234 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
235 ret[3] = ret[7] = '!'; \
236 flags = EGET(phdr[i].p_flags); \
237 } \
238 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
239 *found = 1; \
240 ++shown; \
241 } \
242 } else if (elf->shdr != NULL) { \
243 /* no program headers which means this is prob an object file */ \
244 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
245 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
246 char *str; \
247 if ((void*)strtbl > (void*)elf->data_end) \
248 goto skip_this_shdr##B; \
249 check_flags = SHF_WRITE|SHF_EXECINSTR; \
250 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
251 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
252 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
253 str = elf->data + offset; \
254 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
255 if (!strcmp(str, NOTE_GNU_STACK)) { \
256 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
257 flags = EGET(shdr[i].sh_flags); \
258 if (be_quiet && ((flags & check_flags) != check_flags)) \
259 continue; \
260 ++*found_phdr; \
261 shown = 1; \
262 if (flags & SHF_WRITE) ret[0] = 'W'; \
263 if (flags & SHF_ALLOC) ret[1] = 'A'; \
264 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
265 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
266 break; \
267 } \
268 } \
269 skip_this_shdr##B: \
270 if (!multi_stack) { \
271 if (file_matches_list(elf->filename, qa_execstack)) \
272 return NULL; \
273 *found_phdr = 1; \
274 shown = 1; \
275 memcpy(ret, "!WX", 3); \
276 } \
277 } \
278 }
279 SHOW_PHDR(32)
280 SHOW_PHDR(64)
281
282 if (be_wewy_wewy_quiet || (be_quiet && !shown))
283 return NULL;
284 else
285 return ret;
286 }
287
288 static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
289 {
290 static const char *ret = "TEXTREL";
291 unsigned long i;
292
293 if (!show_textrel && !show_textrels) return NULL;
294
295 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
296
297 if (elf->phdr) {
298 #define SHOW_TEXTREL(B) \
299 if (elf->elf_class == ELFCLASS ## B) { \
300 Elf ## B ## _Dyn *dyn; \
301 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
302 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
303 Elf ## B ## _Off offset; \
304 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
305 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
306 offset = EGET(phdr[i].p_offset); \
307 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
308 dyn = DYN ## B (elf->data + offset); \
309 while (EGET(dyn->d_tag) != DT_NULL) { \
310 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
311 *found_textrel = 1; \
312 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
313 return (be_wewy_wewy_quiet ? NULL : ret); \
314 } \
315 ++dyn; \
316 } \
317 } }
318 SHOW_TEXTREL(32)
319 SHOW_TEXTREL(64)
320 }
321
322 if (be_quiet || be_wewy_wewy_quiet)
323 return NULL;
324 else
325 return " - ";
326 }
327 static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
328 {
329 unsigned long s, r, rmax;
330 void *symtab_void, *strtab_void, *text_void;
331
332 if (!show_textrels) return NULL;
333
334 /* don't search for TEXTREL's if the ELF doesn't have any */
335 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
336 if (!*found_textrel) return NULL;
337
338 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
339 text_void = elf_findsecbyname(elf, ".text");
340
341 if (symtab_void && strtab_void && text_void && elf->shdr) {
342 #define SHOW_TEXTRELS(B) \
343 if (elf->elf_class == ELFCLASS ## B) { \
344 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
345 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
346 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
347 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
348 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
349 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
350 uint ## B ## _t memsz = EGET(text->sh_size); \
351 Elf ## B ## _Rel *rel; \
352 Elf ## B ## _Rela *rela; \
353 /* search the section headers for relocations */ \
354 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
355 uint32_t sh_type = EGET(shdr[s].sh_type); \
356 if (sh_type == SHT_REL) { \
357 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \
358 rela = NULL; \
359 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
360 } else if (sh_type == SHT_RELA) { \
361 rel = NULL; \
362 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \
363 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
364 } else \
365 continue; \
366 /* now see if any of the relocs are in the .text */ \
367 for (r = 0; r < rmax; ++r) { \
368 unsigned long sym_max; \
369 Elf ## B ## _Addr offset_tmp; \
370 Elf ## B ## _Sym *func; \
371 Elf ## B ## _Sym *sym; \
372 Elf ## B ## _Addr r_offset; \
373 uint ## B ## _t r_info; \
374 if (sh_type == SHT_REL) { \
375 r_offset = EGET(rel[r].r_offset); \
376 r_info = EGET(rel[r].r_info); \
377 } else { \
378 r_offset = EGET(rela[r].r_offset); \
379 r_info = EGET(rela[r].r_info); \
380 } \
381 /* make sure this relocation is inside of the .text */ \
382 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
383 if (be_verbose <= 2) continue; \
384 } else \
385 *found_textrels = 1; \
386 /* locate this relocation symbol name */ \
387 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
388 if ((void*)sym > (void*)elf->data_end) { \
389 warn("%s: corrupt ELF symbol", elf->filename); \
390 continue; \
391 } \
392 sym_max = ELF ## B ## _R_SYM(r_info); \
393 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
394 sym += sym_max; \
395 else \
396 sym = NULL; \
397 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
398 /* show the raw details about this reloc */ \
399 printf(" %s: ", elf->base_filename); \
400 if (sym && sym->st_name) \
401 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \
402 else \
403 printf("(memory/fake?)"); \
404 printf(" [0x%lX]", (unsigned long)r_offset); \
405 /* now try to find the closest symbol that this rel is probably in */ \
406 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
407 func = NULL; \
408 offset_tmp = 0; \
409 while (sym_max--) { \
410 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
411 func = sym; \
412 offset_tmp = EGET(sym->st_value); \
413 } \
414 ++sym; \
415 } \
416 printf(" in "); \
417 if (func && func->st_name) \
418 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \
419 else \
420 printf("(NULL: fake?)"); \
421 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
422 } \
423 } }
424 SHOW_TEXTRELS(32)
425 SHOW_TEXTRELS(64)
426 }
427 if (!*found_textrels)
428 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
429
430 return NULL;
431 }
432
433 static void rpath_security_checks(elfobj *, char *, const char *);
434 static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
435 {
436 struct stat st;
437 switch (*item) {
438 case '/': break;
439 case '.':
440 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
441 break;
442 case ':':
443 case '\0':
444 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
445 break;
446 case '$':
447 if (fstat(elf->fd, &st) != -1)
448 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
449 warnf("Security problem with %s='%s' in %s with mode set of %o",
450 dt_type, item, elf->filename, st.st_mode & 07777);
451 break;
452 default:
453 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
454 break;
455 }
456 }
457 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
458 {
459 unsigned long i, s;
460 char *rpath, *runpath, **r;
461 void *strtbl_void;
462
463 if (!show_rpath) return;
464
465 strtbl_void = elf_findsecbyname(elf, ".dynstr");
466 rpath = runpath = NULL;
467
468 if (elf->phdr && strtbl_void) {
469 #define SHOW_RPATH(B) \
470 if (elf->elf_class == ELFCLASS ## B) { \
471 Elf ## B ## _Dyn *dyn; \
472 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
473 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
474 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
475 Elf ## B ## _Off offset; \
476 Elf ## B ## _Xword word; \
477 /* Scan all the program headers */ \
478 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
479 /* Just scan dynamic headers */ \
480 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
481 offset = EGET(phdr[i].p_offset); \
482 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
483 /* Just scan dynamic RPATH/RUNPATH headers */ \
484 dyn = DYN ## B (elf->data + offset); \
485 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
486 if (word == DT_RPATH) { \
487 r = &rpath; \
488 } else if (word == DT_RUNPATH) { \
489 r = &runpath; \
490 } else { \
491 ++dyn; \
492 continue; \
493 } \
494 /* Verify the memory is somewhat sane */ \
495 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
496 if (offset < (Elf ## B ## _Off)elf->len) { \
497 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
498 *r = (char*)(elf->data + offset); \
499 /* cache the length in case we need to nuke this section later on */ \
500 if (fix_elf) \
501 offset = strlen(*r); \
502 /* If quiet, don't output paths in ld.so.conf */ \
503 if (be_quiet) { \
504 size_t len; \
505 char *start, *end; \
506 /* note that we only 'chop' off leading known paths. */ \
507 /* since *r is read-only memory, we can only move the ptr forward. */ \
508 start = *r; \
509 /* scan each path in : delimited list */ \
510 while (start) { \
511 rpath_security_checks(elf, start, get_elfdtype(word)); \
512 end = strchr(start, ':'); \
513 len = (end ? abs(end - start) : strlen(start)); \
514 if (use_ldcache) \
515 for (s = 0; ldpaths[s]; ++s) \
516 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
517 *r = end; \
518 /* corner case ... if RPATH reads "/usr/lib:", we want \
519 * to show ':' rather than '' */ \
520 if (end && end[1] != '\0') \
521 (*r)++; \
522 break; \
523 } \
524 if (!*r || !end) \
525 break; \
526 else \
527 start = start + len + 1; \
528 } \
529 } \
530 if (*r) { \
531 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
532 /* just nuke it */ \
533 nuke_it##B: \
534 memset(*r, 0x00, offset); \
535 *r = NULL; \
536 ESET(dyn->d_tag, DT_DEBUG); \
537 ESET(dyn->d_un.d_ptr, 0); \
538 } else if (fix_elf) { \
539 /* try to clean "bad" paths */ \
540 size_t len, tmpdir_len; \
541 char *start, *end; \
542 const char *tmpdir; \
543 start = *r; \
544 tmpdir = (getenv("TMPDIR") ? : "."); \
545 tmpdir_len = strlen(tmpdir); \
546 while (1) { \
547 end = strchr(start, ':'); \
548 if (start == end) { \
549 eat_this_path##B: \
550 len = strlen(end); \
551 memmove(start, end+1, len); \
552 start[len-1] = '\0'; \
553 end = start - 1; \
554 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
555 if (!end) { \
556 if (start == *r) \
557 goto nuke_it##B; \
558 *--start = '\0'; \
559 } else \
560 goto eat_this_path##B; \
561 } \
562 if (!end) \
563 break; \
564 start = end + 1; \
565 } \
566 if (**r == '\0') \
567 goto nuke_it##B; \
568 } \
569 if (*r) \
570 *found_rpath = 1; \
571 } \
572 } \
573 ++dyn; \
574 } \
575 } }
576 SHOW_RPATH(32)
577 SHOW_RPATH(64)
578 }
579
580 if (be_wewy_wewy_quiet) return;
581
582 if (rpath && runpath) {
583 if (!strcmp(rpath, runpath)) {
584 xstrcat(ret, runpath, ret_len);
585 } else {
586 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
587 xchrcat(ret, '{', ret_len);
588 xstrcat(ret, rpath, ret_len);
589 xchrcat(ret, ',', ret_len);
590 xstrcat(ret, runpath, ret_len);
591 xchrcat(ret, '}', ret_len);
592 }
593 } else if (rpath || runpath)
594 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
595 else if (!be_quiet)
596 xstrcat(ret, " - ", ret_len);
597 }
598
599 #define LDSO_CACHE_MAGIC "ld.so-"
600 #define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
601 #define LDSO_CACHE_VER "1.7.0"
602 #define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
603 #define FLAG_ANY -1
604 #define FLAG_TYPE_MASK 0x00ff
605 #define FLAG_LIBC4 0x0000
606 #define FLAG_ELF 0x0001
607 #define FLAG_ELF_LIBC5 0x0002
608 #define FLAG_ELF_LIBC6 0x0003
609 #define FLAG_REQUIRED_MASK 0xff00
610 #define FLAG_SPARC_LIB64 0x0100
611 #define FLAG_IA64_LIB64 0x0200
612 #define FLAG_X8664_LIB64 0x0300
613 #define FLAG_S390_LIB64 0x0400
614 #define FLAG_POWERPC_LIB64 0x0500
615 #define FLAG_MIPS64_LIBN32 0x0600
616 #define FLAG_MIPS64_LIBN64 0x0700
617
618 static char *lookup_cache_lib(elfobj *, char *);
619
620 #if defined(__GLIBC__) || defined(__UCLIBC__)
621
622 static char *lookup_cache_lib(elfobj *elf, char *fname)
623 {
624 int fd = 0;
625 char *strs;
626 static char buf[__PAX_UTILS_PATH_MAX] = "";
627 const char *cachefile = "/etc/ld.so.cache";
628 struct stat st;
629
630 typedef struct {
631 char magic[LDSO_CACHE_MAGIC_LEN];
632 char version[LDSO_CACHE_VER_LEN];
633 int nlibs;
634 } header_t;
635 header_t *header;
636
637 typedef struct {
638 int flags;
639 int sooffset;
640 int liboffset;
641 } libentry_t;
642 libentry_t *libent;
643
644 if (fname == NULL)
645 return NULL;
646
647 if (ldcache == 0) {
648 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1)
649 return NULL;
650
651 /* cache these values so we only map/unmap the cache file once */
652 ldcache_size = st.st_size;
653 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
654
655 close(fd);
656
657 if (ldcache == (caddr_t)-1) {
658 ldcache = 0;
659 return NULL;
660 }
661
662 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
663 return NULL;
664 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
665 return NULL;
666 }
667
668 header = (header_t *) ldcache;
669 libent = (libentry_t *) (ldcache + sizeof(header_t));
670 strs = (char *) &libent[header->nlibs];
671
672 for (fd = 0; fd < header->nlibs; fd++) {
673 /* this should be more fine grained, but for now we assume that
674 * diff arches will not be cached together. and we ignore the
675 * the different multilib mips cases. */
676 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
677 continue;
678 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
679 continue;
680
681 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
682 continue;
683 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
684 }
685 return buf;
686 }
687 #elif defined(__NetBSD__)
688 static char *lookup_cache_lib(elfobj *elf, char *fname)
689 {
690 static char buf[__PAX_UTILS_PATH_MAX] = "";
691 static struct stat st;
692
693 char **ldpath;
694 for (ldpath = ldpaths; *ldpath != NULL; ldpath++) {
695 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", *ldpath, fname) >= sizeof(buf))
696 continue; /* if the pathname is too long, or something went wrong, ignore */
697
698 if (stat(buf, &st) != 0)
699 continue; /* if the lib doesn't exist in *ldpath, look further */
700
701 /* NetBSD doesn't actually do sanity checks, it just loads the file
702 * and if that doesn't work, continues looking in other directories.
703 * This cannot easily be safely emulated, unfortunately. For now,
704 * just assume that if it exists, it's a valid library. */
705
706 return buf;
707 }
708
709 /* not found in any path */
710 return NULL;
711 }
712 #else
713 #warning Cache support not implemented for your target
714 static char *lookup_cache_lib(elfobj *elf, char *fname)
715 {
716 return NULL;
717 }
718 #endif
719
720 static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
721 {
722 unsigned long i;
723 char *needed;
724 void *strtbl_void;
725 char *p;
726
727 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
728
729 strtbl_void = elf_findsecbyname(elf, ".dynstr");
730
731 if (elf->phdr && strtbl_void) {
732 #define SHOW_NEEDED(B) \
733 if (elf->elf_class == ELFCLASS ## B) { \
734 Elf ## B ## _Dyn *dyn; \
735 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
736 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
737 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
738 Elf ## B ## _Off offset; \
739 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
740 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
741 offset = EGET(phdr[i].p_offset); \
742 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
743 dyn = DYN ## B (elf->data + offset); \
744 while (EGET(dyn->d_tag) != DT_NULL) { \
745 if (EGET(dyn->d_tag) == DT_NEEDED) { \
746 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
747 if (offset >= (Elf ## B ## _Off)elf->len) { \
748 ++dyn; \
749 continue; \
750 } \
751 needed = (char*)(elf->data + offset); \
752 if (op == 0) { \
753 if (!be_wewy_wewy_quiet) { \
754 if (*found_needed) xchrcat(ret, ',', ret_len); \
755 if (use_ldcache) \
756 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
757 needed = p; \
758 xstrcat(ret, needed, ret_len); \
759 } \
760 *found_needed = 1; \
761 } else { \
762 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \
763 *found_lib = 1; \
764 return (be_wewy_wewy_quiet ? NULL : needed); \
765 } \
766 } \
767 } \
768 ++dyn; \
769 } \
770 } }
771 SHOW_NEEDED(32)
772 SHOW_NEEDED(64)
773 if (op == 0 && !*found_needed && be_verbose)
774 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
775 }
776
777 return NULL;
778 }
779 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
780 {
781 void *strtbl_void;
782
783 if (!show_interp) return NULL;
784
785 strtbl_void = elf_findsecbyname(elf, ".interp");
786
787 if (strtbl_void) {
788 #define SHOW_INTERP(B) \
789 if (elf->elf_class == ELFCLASS ## B) { \
790 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
791 *found_interp = 1; \
792 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
793 }
794 SHOW_INTERP(32)
795 SHOW_INTERP(64)
796 }
797 return NULL;
798 }
799 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
800 {
801 unsigned long i;
802 struct stat s;
803 char dynamic = 0;
804
805 if (!show_bind) return NULL;
806 if (!elf->phdr) return NULL;
807
808 #define SHOW_BIND(B) \
809 if (elf->elf_class == ELFCLASS ## B) { \
810 Elf ## B ## _Dyn *dyn; \
811 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
812 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
813 Elf ## B ## _Off offset; \
814 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
815 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
816 dynamic = 1; \
817 offset = EGET(phdr[i].p_offset); \
818 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
819 dyn = DYN ## B (elf->data + offset); \
820 while (EGET(dyn->d_tag) != DT_NULL) { \
821 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
822 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
823 { \
824 if (be_quiet) return NULL; \
825 *found_bind = 1; \
826 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
827 } \
828 ++dyn; \
829 } \
830 } \
831 }
832 SHOW_BIND(32)
833 SHOW_BIND(64)
834
835 if (be_wewy_wewy_quiet) return NULL;
836
837 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) {
838 return NULL;
839 } else {
840 *found_bind = 1;
841 return (char *) (dynamic ? "LAZY" : "STATIC");
842 }
843 }
844 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
845 {
846 unsigned long i;
847 char *soname;
848 void *strtbl_void;
849
850 if (!show_soname) return NULL;
851
852 strtbl_void = elf_findsecbyname(elf, ".dynstr");
853
854 if (elf->phdr && strtbl_void) {
855 #define SHOW_SONAME(B) \
856 if (elf->elf_class == ELFCLASS ## B) { \
857 Elf ## B ## _Dyn *dyn; \
858 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
859 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
860 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
861 Elf ## B ## _Off offset; \
862 /* only look for soname in shared objects */ \
863 if (ehdr->e_type != ET_DYN) \
864 return NULL; \
865 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
866 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
867 offset = EGET(phdr[i].p_offset); \
868 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
869 dyn = DYN ## B (elf->data + offset); \
870 while (EGET(dyn->d_tag) != DT_NULL) { \
871 if (EGET(dyn->d_tag) == DT_SONAME) { \
872 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
873 if (offset >= (Elf ## B ## _Off)elf->len) { \
874 ++dyn; \
875 continue; \
876 } \
877 soname = (char*)(elf->data + offset); \
878 *found_soname = 1; \
879 return (be_wewy_wewy_quiet ? NULL : soname); \
880 } \
881 ++dyn; \
882 } \
883 } }
884 SHOW_SONAME(32)
885 SHOW_SONAME(64)
886 }
887
888 return NULL;
889 }
890 static char *scanelf_file_sym(elfobj *elf, char *found_sym)
891 {
892 unsigned long i;
893 char *ret;
894 void *symtab_void, *strtab_void;
895
896 if (!find_sym) return NULL;
897 ret = find_sym;
898
899 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
900
901 if (symtab_void && strtab_void) {
902 #define FIND_SYM(B) \
903 if (elf->elf_class == ELFCLASS ## B) { \
904 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
905 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
906 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
907 unsigned long cnt = EGET(symtab->sh_entsize); \
908 char *symname; \
909 if (cnt) \
910 cnt = EGET(symtab->sh_size) / cnt; \
911 for (i = 0; i < cnt; ++i) { \
912 if (sym->st_name) { \
913 /* make sure the symbol name is in acceptable memory range */ \
914 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
915 if ((void*)symname > (void*)elf->data_end) { \
916 warnf("%s: corrupt ELF symbols", elf->filename); \
917 ++sym; \
918 continue; \
919 } \
920 /* debug display ... show all symbols and some extra info */ \
921 if (*ret == '*') { \
922 printf("%s(%s) %5lX %15s %s\n", \
923 ((*found_sym == 0) ? "\n\t" : "\t"), \
924 elf->base_filename, \
925 (unsigned long)sym->st_size, \
926 get_elfstttype(sym->st_info), \
927 symname); \
928 *found_sym = 1; \
929 } else { \
930 /* allow the user to specify a comma delimited list of symbols to search for */ \
931 char *this_sym, *this_sym_ver, *next_sym; \
932 this_sym = ret; \
933 this_sym_ver = versioned_symname; \
934 do { \
935 next_sym = strchr(this_sym, ','); \
936 if (next_sym == NULL) \
937 next_sym = this_sym + strlen(this_sym); \
938 /* do we want a defined symbol ? */ \
939 if (*this_sym == '+') { \
940 if (sym->st_shndx == SHN_UNDEF) \
941 goto skip_this_sym##B; \
942 ++this_sym; \
943 ++this_sym_ver; \
944 /* do we want an undefined symbol ? */ \
945 } else if (*this_sym == '-') { \
946 if (sym->st_shndx != SHN_UNDEF) \
947 goto skip_this_sym##B; \
948 ++this_sym; \
949 ++this_sym_ver; \
950 } \
951 /* ok, lets compare the name now */ \
952 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
953 (strncmp(this_sym_ver, symname, strlen(this_sym_ver)) == 0)) { \
954 if (be_semi_verbose) { \
955 char buf[126]; \
956 snprintf(buf, sizeof(buf), "%lX %s %s", \
957 (unsigned long)sym->st_size, get_elfstttype(sym->st_info), this_sym); \
958 ret = buf; \
959 } else \
960 ret = this_sym; \
961 (*found_sym)++; \
962 goto break_out; \
963 } \
964 skip_this_sym##B: this_sym = next_sym + 1; \
965 } while (*next_sym != '\0'); \
966 } \
967 } \
968 ++sym; \
969 } }
970 FIND_SYM(32)
971 FIND_SYM(64)
972 }
973
974 break_out:
975 if (be_wewy_wewy_quiet) return NULL;
976
977 if (*find_sym != '*' && *found_sym)
978 return ret;
979 if (be_quiet)
980 return NULL;
981 else
982 return (char *)" - ";
983 }
984
985
986 static char *scanelf_file_sections(elfobj *elf, char *found_section)
987 {
988 if (!find_section)
989 return NULL;
990
991 #define FIND_SECTION(B) \
992 if (elf->elf_class == ELFCLASS ## B) { \
993 int invert; \
994 Elf ## B ## _Shdr *section; \
995 invert = (*find_section == '!' ? 1 : 0); \
996 section = SHDR ## B (elf_findsecbyname(elf, find_section+invert)); \
997 if ((section == NULL && invert) || (section != NULL && !invert)) \
998 *found_section = 1; \
999 }
1000 FIND_SECTION(32)
1001 FIND_SECTION(64)
1002
1003 if (be_wewy_wewy_quiet)
1004 return NULL;
1005
1006 if (*found_section)
1007 return find_section;
1008
1009 if (be_quiet)
1010 return NULL;
1011 else
1012 return (char *)" - ";
1013 }
1014
1015 /* scan an elf file and show all the fun stuff */
1016 #define prints(str) write(fileno(stdout), str, strlen(str))
1017 static int scanelf_elfobj(elfobj *elf)
1018 {
1019 unsigned long i;
1020 char found_pax, found_phdr, found_relro, found_load, found_textrel,
1021 found_rpath, found_needed, found_interp, found_bind, found_soname,
1022 found_sym, found_lib, found_file, found_textrels, found_section;
1023 static char *out_buffer = NULL;
1024 static size_t out_len;
1025
1026 found_pax = found_phdr = found_relro = found_load = found_textrel = \
1027 found_rpath = found_needed = found_interp = found_bind = found_soname = \
1028 found_sym = found_lib = found_file = found_textrels = found_section = 0;
1029
1030 if (be_verbose > 2)
1031 printf("%s: scanning file {%s,%s}\n", elf->filename,
1032 get_elfeitype(EI_CLASS, elf->elf_class),
1033 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
1034 else if (be_verbose > 1)
1035 printf("%s: scanning file\n", elf->filename);
1036
1037 /* init output buffer */
1038 if (!out_buffer) {
1039 out_len = sizeof(char) * 80;
1040 out_buffer = (char*)xmalloc(out_len);
1041 }
1042 *out_buffer = '\0';
1043
1044 /* show the header */
1045 if (!be_quiet && show_banner) {
1046 for (i = 0; out_format[i]; ++i) {
1047 if (!IS_MODIFIER(out_format[i])) continue;
1048
1049 switch (out_format[++i]) {
1050 case '+': break;
1051 case '%': break;
1052 case '#': break;
1053 case 'F':
1054 case 'p':
1055 case 'f': prints("FILE "); found_file = 1; break;
1056 case 'o': prints(" TYPE "); break;
1057 case 'x': prints(" PAX "); break;
1058 case 'e': prints("STK/REL/PTL "); break;
1059 case 't': prints("TEXTREL "); break;
1060 case 'r': prints("RPATH "); break;
1061 case 'n': prints("NEEDED "); break;
1062 case 'i': prints("INTERP "); break;
1063 case 'b': prints("BIND "); break;
1064 case 'S': prints("SONAME "); break;
1065 case 's': prints("SYM "); break;
1066 case 'N': prints("LIB "); break;
1067 case 'T': prints("TEXTRELS "); break;
1068 case 'k': prints("SECTION "); break;
1069 default: warnf("'%c' has no title ?", out_format[i]);
1070 }
1071 }
1072 if (!found_file) prints("FILE ");
1073 prints("\n");
1074 found_file = 0;
1075 show_banner = 0;
1076 }
1077
1078 /* dump all the good stuff */
1079 for (i = 0; out_format[i]; ++i) {
1080 const char *out;
1081 const char *tmp;
1082
1083 if (!IS_MODIFIER(out_format[i])) {
1084 xchrcat(&out_buffer, out_format[i], &out_len);
1085 continue;
1086 }
1087
1088 out = NULL;
1089 be_wewy_wewy_quiet = (out_format[i] == '#');
1090 be_semi_verbose = (out_format[i] == '+');
1091 switch (out_format[++i]) {
1092 case '+':
1093 case '%':
1094 case '#':
1095 xchrcat(&out_buffer, out_format[i], &out_len); break;
1096 case 'F':
1097 found_file = 1;
1098 if (be_wewy_wewy_quiet) break;
1099 xstrcat(&out_buffer, elf->filename, &out_len);
1100 break;
1101 case 'p':
1102 found_file = 1;
1103 if (be_wewy_wewy_quiet) break;
1104 tmp = elf->filename;
1105 if (search_path) {
1106 ssize_t len_search = strlen(search_path);
1107 ssize_t len_file = strlen(elf->filename);
1108 if (!strncmp(elf->filename, search_path, len_search) && \
1109 len_file > len_search)
1110 tmp += len_search;
1111 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1112 }
1113 xstrcat(&out_buffer, tmp, &out_len);
1114 break;
1115 case 'f':
1116 found_file = 1;
1117 if (be_wewy_wewy_quiet) break;
1118 tmp = strrchr(elf->filename, '/');
1119 tmp = (tmp == NULL ? elf->filename : tmp+1);
1120 xstrcat(&out_buffer, tmp, &out_len);
1121 break;
1122 case 'o': out = get_elfetype(elf); break;
1123 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
1124 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
1125 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1126 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
1127 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1128 case 'n':
1129 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
1130 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1131 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1132 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
1133 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1134 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1135 default: warnf("'%c' has no scan code?", out_format[i]);
1136 }
1137 if (out) {
1138 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
1139 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
1140 xstrncat(&out_buffer, out, &out_len, (tmp-out));
1141 else
1142 xstrcat(&out_buffer, out, &out_len);
1143 }
1144 }
1145
1146 #define FOUND_SOMETHING() \
1147 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1148 found_rpath || found_needed || found_interp || found_bind || \
1149 found_soname || found_sym || found_lib || found_textrels || found_section )
1150
1151 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1152 xchrcat(&out_buffer, ' ', &out_len);
1153 xstrcat(&out_buffer, elf->filename, &out_len);
1154 }
1155 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
1156 puts(out_buffer);
1157 fflush(stdout);
1158 }
1159
1160 return 0;
1161 }
1162
1163 /* scan a single elf */
1164 static int scanelf_elf(const char *filename, int fd, size_t len)
1165 {
1166 int ret = 1;
1167 elfobj *elf;
1168
1169 /* verify this is real ELF */
1170 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1171 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1172 return ret;
1173 }
1174 switch (match_bits) {
1175 case 32:
1176 if (elf->elf_class != ELFCLASS32)
1177 goto label_done;
1178 break;
1179 case 64:
1180 if (elf->elf_class != ELFCLASS64)
1181 goto label_done;
1182 break;
1183 default: break;
1184 }
1185 if (strlen(match_etypes)) {
1186 char sbuf[126];
1187 strncpy(sbuf, match_etypes, sizeof(sbuf));
1188 if (strchr(match_etypes, ',') != NULL) {
1189 char *p;
1190 while((p = strrchr(sbuf, ',')) != NULL) {
1191 *p = 0;
1192 if (etype_lookup(p+1) == get_etype(elf))
1193 goto label_ret;
1194 }
1195 }
1196 if (etype_lookup(sbuf) != get_etype(elf))
1197 goto label_done;
1198 }
1199
1200 label_ret:
1201 ret = scanelf_elfobj(elf);
1202
1203 label_done:
1204 unreadelf(elf);
1205 return ret;
1206 }
1207
1208 /* scan an archive of elfs */
1209 static int scanelf_archive(const char *filename, int fd, size_t len)
1210 {
1211 archive_handle *ar;
1212 archive_member *m;
1213 char *ar_buffer;
1214 elfobj *elf;
1215
1216 ar = ar_open_fd(filename, fd);
1217 if (ar == NULL)
1218 return 1;
1219
1220 ar_buffer = (char*)mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1221 while ((m=ar_next(ar)) != NULL) {
1222 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size);
1223 if (elf) {
1224 scanelf_elfobj(elf);
1225 unreadelf(elf);
1226 }
1227 }
1228 munmap(ar_buffer, len);
1229
1230 return 0;
1231 }
1232 /* scan a file which may be an elf or an archive or some other magical beast */
1233 static void scanelf_file(const char *filename)
1234 {
1235 struct stat st;
1236 int fd;
1237
1238 /* make sure 'filename' exists */
1239 if (lstat(filename, &st) == -1) {
1240 if (be_verbose > 2) printf("%s: does not exist\n", filename);
1241 return;
1242 }
1243
1244 /* always handle regular files and handle symlinked files if no -y */
1245 if (S_ISLNK(st.st_mode)) {
1246 if (!scan_symlink) return;
1247 stat(filename, &st);
1248 }
1249 if (!S_ISREG(st.st_mode)) {
1250 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1251 return;
1252 }
1253
1254 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1255 return;
1256
1257 if (scanelf_elf(filename, fd, st.st_size) == 1 && scan_archives)
1258 /* if it isn't an ELF, maybe it's an .a archive */
1259 scanelf_archive(filename, fd, st.st_size);
1260
1261 close(fd);
1262 }
1263
1264 /* scan a directory for ET_EXEC files and print when we find one */
1265 static void scanelf_dir(const char *path)
1266 {
1267 register DIR *dir;
1268 register struct dirent *dentry;
1269 struct stat st_top, st;
1270 char buf[__PAX_UTILS_PATH_MAX];
1271 size_t pathlen = 0, len = 0;
1272
1273 /* make sure path exists */
1274 if (lstat(path, &st_top) == -1) {
1275 if (be_verbose > 2) printf("%s: does not exist\n", path);
1276 return;
1277 }
1278
1279 /* ok, if it isn't a directory, assume we can open it */
1280 if (!S_ISDIR(st_top.st_mode)) {
1281 scanelf_file(path);
1282 return;
1283 }
1284
1285 /* now scan the dir looking for fun stuff */
1286 if ((dir = opendir(path)) == NULL) {
1287 warnf("could not opendir %s: %s", path, strerror(errno));
1288 return;
1289 }
1290 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1291
1292 pathlen = strlen(path);
1293 while ((dentry = readdir(dir))) {
1294 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1295 continue;
1296 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
1297 if (len >= sizeof(buf)) {
1298 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1299 (unsigned long)len, (unsigned long)sizeof(buf));
1300 continue;
1301 }
1302 snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name);
1303 if (lstat(buf, &st) != -1) {
1304 if (S_ISREG(st.st_mode))
1305 scanelf_file(buf);
1306 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1307 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1308 scanelf_dir(buf);
1309 }
1310 }
1311 }
1312 closedir(dir);
1313 }
1314
1315 static int scanelf_from_file(const char *filename)
1316 {
1317 FILE *fp = NULL;
1318 char *p;
1319 char path[__PAX_UTILS_PATH_MAX];
1320
1321 if (strcmp(filename, "-") == 0)
1322 fp = stdin;
1323 else if ((fp = fopen(filename, "r")) == NULL)
1324 return 1;
1325
1326 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1327 if ((p = strchr(path, '\n')) != NULL)
1328 *p = 0;
1329 search_path = path;
1330 scanelf_dir(path);
1331 }
1332 if (fp != stdin)
1333 fclose(fp);
1334 return 0;
1335 }
1336
1337 #if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1338
1339 static int load_ld_cache_config(int i, const char *fname)
1340 {
1341 FILE *fp = NULL;
1342 char *p;
1343 char path[__PAX_UTILS_PATH_MAX];
1344
1345 if (i + 1 == ARRAY_SIZE(ldpaths))
1346 return i;
1347
1348 if ((fp = fopen(fname, "r")) == NULL)
1349 return i;
1350
1351 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1352 if ((p = strrchr(path, '\r')) != NULL)
1353 *p = 0;
1354 if ((p = strchr(path, '\n')) != NULL)
1355 *p = 0;
1356 #ifdef __linux__
1357 // recursive includes of the same file will make this segfault.
1358 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1359 glob64_t gl;
1360 size_t x;
1361 char gpath[__PAX_UTILS_PATH_MAX];
1362
1363 memset(gpath, 0, sizeof(gpath));
1364
1365 if (path[8] != '/')
1366 snprintf(gpath, sizeof(gpath), "/etc/%s", &path[8]);
1367 else
1368 strncpy(gpath, &path[8], sizeof(gpath));
1369
1370 if ((glob64(gpath, 0, NULL, &gl)) == 0) {
1371 for (x = 0; x < gl.gl_pathc; ++x) {
1372 /* try to avoid direct loops */
1373 if (strcmp(gl.gl_pathv[x], fname) == 0)
1374 continue;
1375 i = load_ld_cache_config(i, gl.gl_pathv[x]);
1376 if (i + 1 >= ARRAY_SIZE(ldpaths)) {
1377 globfree64(&gl);
1378 return i;
1379 }
1380 }
1381 globfree64 (&gl);
1382 continue;
1383 } else
1384 abort();
1385 }
1386 #endif
1387 if (*path != '/')
1388 continue;
1389
1390 ldpaths[i++] = xstrdup(path);
1391
1392 if (i + 1 == ARRAY_SIZE(ldpaths))
1393 break;
1394 }
1395 ldpaths[i] = NULL;
1396
1397 fclose(fp);
1398 return i;
1399 }
1400
1401 #elif defined(__FreeBSD__) || (__DragonFly__)
1402
1403 static int load_ld_cache_config(int i, const char *fname)
1404 {
1405 FILE *fp = NULL;
1406 char *b = NULL, *p;
1407 struct elfhints_hdr hdr;
1408
1409 if (i + 1 == ARRAY_SIZE(ldpaths))
1410 return i;
1411
1412 if ((fp = fopen(fname, "r")) == NULL)
1413 return i;
1414
1415 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1416 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1417 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1418 {
1419 fclose(fp);
1420 return i;
1421 }
1422
1423 b = (char*)malloc(hdr.dirlistlen+1);
1424 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1425 fclose(fp);
1426 free(b);
1427 return i;
1428 }
1429
1430 while ((p = strsep(&b, ":"))) {
1431 if (*p == '\0') continue;
1432 ldpaths[i++] = xstrdup(p);
1433
1434 if (i + 1 == ARRAY_SIZE(ldpaths))
1435 break;
1436 }
1437 ldpaths[i] = NULL;
1438
1439 free(b);
1440 fclose(fp);
1441 return i;
1442 }
1443
1444 #else
1445
1446 #warning Cache config support not implemented for your target
1447 static int load_ld_cache_config(int i, const char *fname)
1448 {
1449 memset(ldpaths, 0x00, sizeof(ldpaths));
1450 }
1451
1452 #endif
1453
1454 /* scan /etc/ld.so.conf for paths */
1455 static void scanelf_ldpath()
1456 {
1457 char scan_l, scan_ul, scan_ull;
1458 int i = 0;
1459
1460 if (!ldpaths[0])
1461 err("Unable to load any paths from ld.so.conf");
1462
1463 scan_l = scan_ul = scan_ull = 0;
1464
1465 while (ldpaths[i]) {
1466 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
1467 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
1468 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
1469 scanelf_dir(ldpaths[i]);
1470 ++i;
1471 }
1472
1473 if (!scan_l) scanelf_dir("/lib");
1474 if (!scan_ul) scanelf_dir("/usr/lib");
1475 if (!scan_ull) scanelf_dir("/usr/local/lib");
1476 }
1477
1478 /* scan env PATH for paths */
1479 static void scanelf_envpath()
1480 {
1481 char *path, *p;
1482
1483 path = getenv("PATH");
1484 if (!path)
1485 err("PATH is not set in your env !");
1486 path = xstrdup(path);
1487
1488 while ((p = strrchr(path, ':')) != NULL) {
1489 scanelf_dir(p + 1);
1490 *p = 0;
1491 }
1492
1493 free(path);
1494 }
1495
1496 /* usage / invocation handling functions */
1497 #define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:BhV"
1498 #define a_argument required_argument
1499 static struct option const long_opts[] = {
1500 {"path", no_argument, NULL, 'p'},
1501 {"ldpath", no_argument, NULL, 'l'},
1502 {"recursive", no_argument, NULL, 'R'},
1503 {"mount", no_argument, NULL, 'm'},
1504 {"symlink", no_argument, NULL, 'y'},
1505 {"archives", no_argument, NULL, 'A'},
1506 {"ldcache", no_argument, NULL, 'L'},
1507 {"fix", no_argument, NULL, 'X'},
1508 {"setpax", a_argument, NULL, 'z'},
1509 {"pax", no_argument, NULL, 'x'},
1510 {"header", no_argument, NULL, 'e'},
1511 {"textrel", no_argument, NULL, 't'},
1512 {"rpath", no_argument, NULL, 'r'},
1513 {"needed", no_argument, NULL, 'n'},
1514 {"interp", no_argument, NULL, 'i'},
1515 {"bind", no_argument, NULL, 'b'},
1516 {"soname", no_argument, NULL, 'S'},
1517 {"symbol", a_argument, NULL, 's'},
1518 {"section", a_argument, NULL, 'k'},
1519 {"lib", a_argument, NULL, 'N'},
1520 {"gmatch", no_argument, NULL, 'g'},
1521 {"textrels", no_argument, NULL, 'T'},
1522 {"etype", a_argument, NULL, 'E'},
1523 {"bits", a_argument, NULL, 'M'},
1524 {"all", no_argument, NULL, 'a'},
1525 {"quiet", no_argument, NULL, 'q'},
1526 {"verbose", no_argument, NULL, 'v'},
1527 {"format", a_argument, NULL, 'F'},
1528 {"from", a_argument, NULL, 'f'},
1529 {"file", a_argument, NULL, 'o'},
1530 {"nobanner", no_argument, NULL, 'B'},
1531 {"help", no_argument, NULL, 'h'},
1532 {"version", no_argument, NULL, 'V'},
1533 {NULL, no_argument, NULL, 0x0}
1534 };
1535
1536 static const char *opts_help[] = {
1537 "Scan all directories in PATH environment",
1538 "Scan all directories in /etc/ld.so.conf",
1539 "Scan directories recursively",
1540 "Don't recursively cross mount points",
1541 "Don't scan symlinks",
1542 "Scan archives (.a files)",
1543 "Utilize ld.so.cache information (use with -r/-n)",
1544 "Try and 'fix' bad things (use with -r/-e)",
1545 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1546 "Print PaX markings",
1547 "Print GNU_STACK/PT_LOAD markings",
1548 "Print TEXTREL information",
1549 "Print RPATH information",
1550 "Print NEEDED information",
1551 "Print INTERP information",
1552 "Print BIND information",
1553 "Print SONAME information",
1554 "Find a specified symbol",
1555 "Find a specified section",
1556 "Find a specified library",
1557 "Use strncmp to match libraries. (use with -N)",
1558 "Locate cause of TEXTREL",
1559 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1560 "Print only ELF files matching numeric bits",
1561 "Print all scanned info (-x -e -t -r -b)\n",
1562 "Only output 'bad' things",
1563 "Be verbose (can be specified more than once)",
1564 "Use specified format for output",
1565 "Read input stream from a filename",
1566 "Write output stream to a filename",
1567 "Don't display the header",
1568 "Print this help and exit",
1569 "Print version and exit",
1570 NULL
1571 };
1572
1573 /* display usage and exit */
1574 static void usage(int status)
1575 {
1576 unsigned long i;
1577 printf("* Scan ELF binaries for stuff\n\n"
1578 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1579 printf("Options: -[%s]\n", PARSE_FLAGS);
1580 for (i = 0; long_opts[i].name; ++i)
1581 if (long_opts[i].has_arg == no_argument)
1582 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
1583 long_opts[i].name, opts_help[i]);
1584 else
1585 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
1586 long_opts[i].name, opts_help[i]);
1587
1588 if (status != EXIT_SUCCESS)
1589 exit(status);
1590
1591 puts("\nThe format modifiers for the -F option are:");
1592 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1593 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1594 puts(" i INTERP \tb BIND \ts symbol");
1595 puts(" N library \to Type \tT TEXTRELs");
1596 puts(" S SONAME \tk section");
1597 puts(" p filename (with search path removed)");
1598 puts(" f filename (short name/basename)");
1599 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1600
1601 puts("\nELF Etypes:");
1602 print_etypes(stdout);
1603
1604 exit(status);
1605 }
1606
1607 /* parse command line arguments and preform needed actions */
1608 static void parseargs(int argc, char *argv[])
1609 {
1610 int i;
1611 const char *from_file = NULL;
1612
1613 opterr = 0;
1614 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1615 switch (i) {
1616
1617 case 'V':
1618 printf("pax-utils-%s: %s compiled %s\n%s\n"
1619 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
1620 VERSION, __FILE__, __DATE__, rcsid, argv0);
1621 exit(EXIT_SUCCESS);
1622 break;
1623 case 'h': usage(EXIT_SUCCESS); break;
1624 case 'f':
1625 if (from_file) warn("You prob don't want to specify -f twice");
1626 from_file = optarg;
1627 break;
1628 case 'E':
1629 strncpy(match_etypes, optarg, sizeof(match_etypes));
1630 break;
1631 case 'M':
1632 match_bits = atoi(optarg);
1633 break;
1634 case 'o': {
1635 if (freopen(optarg, "w", stdout) == NULL)
1636 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1637 break;
1638 }
1639 case 'k':
1640 if (find_section) warn("You prob don't want to specify -k twice");
1641 find_section = optarg;
1642 break;
1643 case 's': {
1644 if (find_sym) warn("You prob don't want to specify -s twice");
1645 find_sym = optarg;
1646 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1647 sprintf(versioned_symname, "%s@", find_sym);
1648 break;
1649 }
1650 case 'N': {
1651 if (find_lib) warn("You prob don't want to specify -N twice");
1652 find_lib = optarg;
1653 break;
1654 }
1655
1656 case 'F': {
1657 if (out_format) warn("You prob don't want to specify -F twice");
1658 out_format = optarg;
1659 break;
1660 }
1661 case 'z': {
1662 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1663 size_t x;
1664
1665 for (x = 0 ; x < strlen(optarg); x++) {
1666 switch(optarg[x]) {
1667 case 'p':
1668 case 'P':
1669 do_state(optarg[x], PAGEEXEC);
1670 break;
1671 case 's':
1672 case 'S':
1673 do_state(optarg[x], SEGMEXEC);
1674 break;
1675 case 'm':
1676 case 'M':
1677 do_state(optarg[x], MPROTECT);
1678 break;
1679 case 'e':
1680 case 'E':
1681 do_state(optarg[x], EMUTRAMP);
1682 break;
1683 case 'r':
1684 case 'R':
1685 do_state(optarg[x], RANDMMAP);
1686 break;
1687 case 'x':
1688 case 'X':
1689 do_state(optarg[x], RANDEXEC);
1690 break;
1691 default:
1692 break;
1693 }
1694 }
1695 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
1696 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
1697 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
1698 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
1699 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1700 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1701 setpax = flags;
1702 break;
1703 }
1704 case 'g': gmatch = 1; break;
1705 case 'L': use_ldcache = 1; break;
1706 case 'y': scan_symlink = 0; break;
1707 case 'A': scan_archives = 1; break;
1708 case 'B': show_banner = 0; break;
1709 case 'l': scan_ldpath = 1; break;
1710 case 'p': scan_envpath = 1; break;
1711 case 'R': dir_recurse = 1; break;
1712 case 'm': dir_crossmount = 0; break;
1713 case 'X': ++fix_elf; break;
1714 case 'x': show_pax = 1; break;
1715 case 'e': show_phdr = 1; break;
1716 case 't': show_textrel = 1; break;
1717 case 'r': show_rpath = 1; break;
1718 case 'n': show_needed = 1; break;
1719 case 'i': show_interp = 1; break;
1720 case 'b': show_bind = 1; break;
1721 case 'S': show_soname = 1; break;
1722 case 'T': show_textrels = 1; break;
1723 case 'q': be_quiet = 1; break;
1724 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1725 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
1726
1727 case ':':
1728 err("Option '%c' is missing parameter", optopt);
1729 case '?':
1730 err("Unknown option '%c' or argument missing", optopt);
1731 default:
1732 err("Unhandled option '%c'; please report this", i);
1733 }
1734 }
1735
1736 /* let the format option override all other options */
1737 if (out_format) {
1738 show_pax = show_phdr = show_textrel = show_rpath = \
1739 show_needed = show_interp = show_bind = show_soname = \
1740 show_textrels = 0;
1741 for (i = 0; out_format[i]; ++i) {
1742 if (!IS_MODIFIER(out_format[i])) continue;
1743
1744 switch (out_format[++i]) {
1745 case '+': break;
1746 case '%': break;
1747 case '#': break;
1748 case 'F': break;
1749 case 'p': break;
1750 case 'f': break;
1751 case 'k': break;
1752 case 's': break;
1753 case 'N': break;
1754 case 'o': break;
1755 case 'x': show_pax = 1; break;
1756 case 'e': show_phdr = 1; break;
1757 case 't': show_textrel = 1; break;
1758 case 'r': show_rpath = 1; break;
1759 case 'n': show_needed = 1; break;
1760 case 'i': show_interp = 1; break;
1761 case 'b': show_bind = 1; break;
1762 case 'S': show_soname = 1; break;
1763 case 'T': show_textrels = 1; break;
1764 default:
1765 err("Invalid format specifier '%c' (byte %i)",
1766 out_format[i], i+1);
1767 }
1768 }
1769
1770 /* construct our default format */
1771 } else {
1772 size_t fmt_len = 30;
1773 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
1774 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1775 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1776 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1777 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1778 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1779 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1780 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1781 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1782 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1783 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1784 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1785 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1786 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1787 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1788 }
1789 if (be_verbose > 2) printf("Format: %s\n", out_format);
1790
1791 /* now lets actually do the scanning */
1792 if (scan_ldpath || use_ldcache)
1793 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
1794 if (scan_ldpath) scanelf_ldpath();
1795 if (scan_envpath) scanelf_envpath();
1796 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
1797 from_file = "-";
1798 if (from_file) {
1799 scanelf_from_file(from_file);
1800 from_file = *argv;
1801 }
1802 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1803 err("Nothing to scan !?");
1804 while (optind < argc) {
1805 search_path = argv[optind++];
1806 scanelf_dir(search_path);
1807 }
1808
1809 /* clean up */
1810 free(versioned_symname);
1811 for (i = 0; ldpaths[i]; ++i)
1812 free(ldpaths[i]);
1813
1814 if (ldcache != 0)
1815 munmap(ldcache, ldcache_size);
1816 }
1817
1818 static char **get_split_env(const char *envvar)
1819 {
1820 const char *delims = " \t\n";
1821 char **envvals = NULL;
1822 char *env, *s;
1823 int nentry;
1824
1825 if ((env = getenv(envvar)) == NULL)
1826 return NULL;
1827
1828 env = xstrdup(env);
1829 if (env == NULL)
1830 return NULL;
1831
1832 s = strtok(env, delims);
1833 if (s == NULL) {
1834 free(env);
1835 return NULL;
1836 }
1837
1838 nentry = 0;
1839 while (s != NULL) {
1840 ++nentry;
1841 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
1842 envvals[nentry-1] = s;
1843 s = strtok(NULL, delims);
1844 }
1845 envvals[nentry] = NULL;
1846
1847 /* don't want to free(env) as it contains the memory that backs
1848 * the envvals array of strings */
1849 return envvals;
1850 }
1851 static void parseenv()
1852 {
1853 qa_textrels = get_split_env("QA_TEXTRELS");
1854 qa_execstack = get_split_env("QA_EXECSTACK");
1855 qa_wx_load = get_split_env("QA_WX_LOAD");
1856 }
1857 #ifdef __PAX_UTILS_CLEANUP
1858 static void cleanup()
1859 {
1860 free(out_format);
1861 free(qa_textrels);
1862 free(qa_execstack);
1863 free(qa_wx_load);
1864 }
1865 #endif
1866
1867
1868
1869 int main(int argc, char *argv[])
1870 {
1871 if (argc < 2)
1872 usage(EXIT_FAILURE);
1873 parseenv();
1874 parseargs(argc, argv);
1875 fclose(stdout);
1876 #ifdef __PAX_UTILS_CLEANUP
1877 cleanup();
1878 warn("The calls to add/delete heap should be off:\n"
1879 "\t- 1 due to the out_buffer not being freed in scanelf_file()\n"
1880 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
1881 #endif
1882 return EXIT_SUCCESS;
1883 }
1884
1885
1886
1887 /* utility funcs */
1888 static char *xstrdup(const char *s)
1889 {
1890 char *ret = strdup(s);
1891 if (!ret) err("Could not strdup(): %s", strerror(errno));
1892 return ret;
1893 }
1894 static void *xmalloc(size_t size)
1895 {
1896 void *ret = malloc(size);
1897 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1898 return ret;
1899 }
1900 static void *xrealloc(void *ptr, size_t size)
1901 {
1902 void *ret = realloc(ptr, size);
1903 if (!ret) err("Could not realloc() %li bytes", (unsigned long)size);
1904 return ret;
1905 }
1906 static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
1907 {
1908 size_t new_len;
1909
1910 new_len = strlen(*dst) + strlen(src);
1911 if (*curr_len <= new_len) {
1912 *curr_len = new_len + (*curr_len / 2);
1913 *dst = realloc(*dst, *curr_len);
1914 if (!*dst)
1915 err("could not realloc() %li bytes", (unsigned long)*curr_len);
1916 }
1917
1918 if (n)
1919 strncat(*dst, src, n);
1920 else
1921 strcat(*dst, src);
1922 }
1923 static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1924 {
1925 static char my_app[2];
1926 my_app[0] = append;
1927 my_app[1] = '\0';
1928 xstrcat(dst, my_app, curr_len);
1929 }
1930
1931 /* Match filename against entries in matchlist, return TRUE
1932 * if the file is listed */
1933 static int file_matches_list(const char *filename, char **matchlist)
1934 {
1935 char **file;
1936 char *match;
1937 char buf[__PAX_UTILS_PATH_MAX];
1938
1939 if (matchlist == NULL)
1940 return 0;
1941
1942 for (file = matchlist; *file != NULL; file++) {
1943 if (search_path) {
1944 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
1945 match = buf;
1946 } else {
1947 match = *file;
1948 }
1949 if (fnmatch(match, filename, 0) == 0)
1950 return 1;
1951 }
1952 return 0;
1953 }

  ViewVC Help
Powered by ViewVC 1.1.20