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

Contents of /pax-utils/scanelf.c

Parent Directory Parent Directory | Revision Log Revision Log


Revision 1.167 - (show annotations) (download) (as text)
Mon Jan 8 07:55:11 2007 UTC (7 years, 6 months ago) by vapier
Branch: MAIN
Changes since 1.166: +18 -2 lines
File MIME type: text/x-csrc
add support for running objdump when using -T -v to get automatic host disassemble

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 1.166 2006/12/11 03:31:54 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 1.166 2006/12/11 03:31:54 vapier Exp $";
13 #define argv0 "scanelf"
14
15 #define IS_MODIFIER(c) (c == '%' || c == '#' || c == '+')
16
17 /* prototypes */
18 static int file_matches_list(const char *filename, char **matchlist);
19 static int scanelf_elfobj(elfobj *elf);
20 static int scanelf_elf(const char *filename, int fd, size_t len);
21 static int scanelf_archive(const char *filename, int fd, size_t len);
22 static int scanelf_file(const char *filename, const struct stat *st_cache);
23 static int scanelf_dir(const char *path);
24 static void scanelf_ldpath(void);
25 static void scanelf_envpath(void);
26 static void usage(int status);
27 static char **get_split_env(const char *envvar);
28 static void parseenv(void);
29 static int parseargs(int argc, char *argv[]);
30 static char *xstrdup(const char *s);
31 static void *xmalloc(size_t size);
32 static void *xrealloc(void *ptr, size_t size);
33 static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n);
34 #define xstrcat(dst,src,curr_len) xstrncat(dst,src,curr_len,0)
35 static inline void xchrcat(char **dst, const char append, size_t *curr_len);
36
37 /* variables to control behavior */
38 static char match_etypes[126] = "";
39 static char *ldpaths[256];
40 static char scan_ldpath = 0;
41 static char scan_envpath = 0;
42 static char scan_symlink = 1;
43 static char scan_archives = 0;
44 static char dir_recurse = 0;
45 static char dir_crossmount = 1;
46 static char show_pax = 0;
47 static char show_phdr = 0;
48 static char show_textrel = 0;
49 static char show_rpath = 0;
50 static char show_needed = 0;
51 static char show_interp = 0;
52 static char show_bind = 0;
53 static char show_soname = 0;
54 static char show_textrels = 0;
55 static char show_banner = 1;
56 static char be_quiet = 0;
57 static char be_verbose = 0;
58 static char be_wewy_wewy_quiet = 0;
59 static char be_semi_verbose = 0;
60 static char *find_sym = NULL, *versioned_symname = NULL;
61 static char *find_lib = NULL;
62 static char *find_section = NULL;
63 static char *out_format = NULL;
64 static char *search_path = NULL;
65 static char fix_elf = 0;
66 static char gmatch = 0;
67 static char use_ldcache = 0;
68
69 static char **qa_textrels = NULL;
70 static char **qa_execstack = NULL;
71 static char **qa_wx_load = NULL;
72
73 int match_bits = 0;
74 caddr_t ldcache = 0;
75 size_t ldcache_size = 0;
76 unsigned long setpax = 0UL;
77
78
79
80 /* sub-funcs for scanelf_file() */
81 static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
82 {
83 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
84 #define GET_SYMTABS(B) \
85 if (elf->elf_class == ELFCLASS ## B) { \
86 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
87 /* debug sections */ \
88 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
89 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
90 /* runtime sections */ \
91 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
92 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
93 if (symtab && dynsym) { \
94 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \
95 } else { \
96 *sym = (void*)(symtab ? symtab : dynsym); \
97 } \
98 if (strtab && dynstr) { \
99 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \
100 } else { \
101 *tab = (void*)(strtab ? strtab : dynstr); \
102 } \
103 }
104 GET_SYMTABS(32)
105 GET_SYMTABS(64)
106 }
107
108 static char *scanelf_file_pax(elfobj *elf, char *found_pax)
109 {
110 static char ret[7];
111 unsigned long i, shown;
112
113 if (!show_pax) return NULL;
114
115 shown = 0;
116 memset(&ret, 0, sizeof(ret));
117
118 if (elf->phdr) {
119 #define SHOW_PAX(B) \
120 if (elf->elf_class == ELFCLASS ## B) { \
121 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
122 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
123 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
124 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
125 continue; \
126 if (fix_elf && setpax) { \
127 /* set the paxctl flags */ \
128 ESET(phdr[i].p_flags, setpax); \
129 } \
130 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
131 continue; \
132 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
133 *found_pax = 1; \
134 ++shown; \
135 break; \
136 } \
137 }
138 SHOW_PAX(32)
139 SHOW_PAX(64)
140 }
141
142
143 if (fix_elf && setpax) {
144 /* set the chpax settings */
145 if (elf->elf_class == ELFCLASS32) {
146 if (EHDR32(elf->ehdr)->e_type == ET_DYN || EHDR32(elf->ehdr)->e_type == ET_EXEC)
147 ESET(EHDR32(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
148 } else {
149 if (EHDR64(elf->ehdr)->e_type == ET_DYN || EHDR64(elf->ehdr)->e_type == ET_EXEC)
150 ESET(EHDR64(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
151 }
152 }
153
154 /* fall back to EI_PAX if no PT_PAX was found */
155 if (!*ret) {
156 static char *paxflags;
157 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
158 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
159 *found_pax = 1;
160 return (be_wewy_wewy_quiet ? NULL : paxflags);
161 }
162 strncpy(ret, paxflags, sizeof(ret));
163 }
164
165 if (be_wewy_wewy_quiet || (be_quiet && !shown))
166 return NULL;
167 else
168 return ret;
169 }
170
171 static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
172 {
173 static char ret[12];
174 char *found;
175 unsigned long i, shown, multi_stack, multi_relro, multi_load;
176 int max_pt_load;
177
178 if (!show_phdr) return NULL;
179
180 memcpy(ret, "--- --- ---\0", 12);
181
182 shown = 0;
183 multi_stack = multi_relro = multi_load = 0;
184 max_pt_load = elf_max_pt_load(elf);
185
186 #define NOTE_GNU_STACK ".note.GNU-stack"
187 #define SHOW_PHDR(B) \
188 if (elf->elf_class == ELFCLASS ## B) { \
189 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
190 Elf ## B ## _Off offset; \
191 uint32_t flags, check_flags; \
192 if (elf->phdr != NULL) { \
193 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
194 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
195 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
196 if (multi_stack++) \
197 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
198 if (file_matches_list(elf->filename, qa_execstack)) \
199 continue; \
200 found = found_phdr; \
201 offset = 0; \
202 check_flags = PF_X; \
203 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
204 if (multi_relro++) \
205 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
206 found = found_relro; \
207 offset = 4; \
208 check_flags = PF_X; \
209 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
210 if (ehdr->e_type == ET_DYN || ehdr->e_type == ET_EXEC) \
211 if (multi_load++ > max_pt_load) \
212 warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
213 if (file_matches_list(elf->filename, qa_wx_load)) \
214 continue; \
215 found = found_load; \
216 offset = 8; \
217 check_flags = PF_W|PF_X; \
218 } else \
219 continue; \
220 flags = EGET(phdr[i].p_flags); \
221 if (be_quiet && ((flags & check_flags) != check_flags)) \
222 continue; \
223 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
224 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
225 ret[3] = ret[7] = '!'; \
226 flags = EGET(phdr[i].p_flags); \
227 } \
228 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
229 *found = 1; \
230 ++shown; \
231 } \
232 } else if (elf->shdr != NULL) { \
233 /* no program headers which means this is prob an object file */ \
234 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
235 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
236 char *str; \
237 if ((void*)strtbl > (void*)elf->data_end) \
238 goto skip_this_shdr##B; \
239 check_flags = SHF_WRITE|SHF_EXECINSTR; \
240 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
241 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
242 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
243 str = elf->data + offset; \
244 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
245 if (!strcmp(str, NOTE_GNU_STACK)) { \
246 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
247 flags = EGET(shdr[i].sh_flags); \
248 if (be_quiet && ((flags & check_flags) != check_flags)) \
249 continue; \
250 ++*found_phdr; \
251 shown = 1; \
252 if (flags & SHF_WRITE) ret[0] = 'W'; \
253 if (flags & SHF_ALLOC) ret[1] = 'A'; \
254 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
255 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
256 break; \
257 } \
258 } \
259 skip_this_shdr##B: \
260 if (!multi_stack) { \
261 if (file_matches_list(elf->filename, qa_execstack)) \
262 return NULL; \
263 *found_phdr = 1; \
264 shown = 1; \
265 memcpy(ret, "!WX", 3); \
266 } \
267 } \
268 }
269 SHOW_PHDR(32)
270 SHOW_PHDR(64)
271
272 if (be_wewy_wewy_quiet || (be_quiet && !shown))
273 return NULL;
274 else
275 return ret;
276 }
277
278 static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
279 {
280 static const char *ret = "TEXTREL";
281 unsigned long i;
282
283 if (!show_textrel && !show_textrels) return NULL;
284
285 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
286
287 if (elf->phdr) {
288 #define SHOW_TEXTREL(B) \
289 if (elf->elf_class == ELFCLASS ## B) { \
290 Elf ## B ## _Dyn *dyn; \
291 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
292 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
293 Elf ## B ## _Off offset; \
294 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
295 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
296 offset = EGET(phdr[i].p_offset); \
297 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
298 dyn = DYN ## B (elf->data + offset); \
299 while (EGET(dyn->d_tag) != DT_NULL) { \
300 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
301 *found_textrel = 1; \
302 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
303 return (be_wewy_wewy_quiet ? NULL : ret); \
304 } \
305 ++dyn; \
306 } \
307 } }
308 SHOW_TEXTREL(32)
309 SHOW_TEXTREL(64)
310 }
311
312 if (be_quiet || be_wewy_wewy_quiet)
313 return NULL;
314 else
315 return " - ";
316 }
317 static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
318 {
319 unsigned long s, r, rmax;
320 void *symtab_void, *strtab_void, *text_void;
321
322 if (!show_textrels) return NULL;
323
324 /* don't search for TEXTREL's if the ELF doesn't have any */
325 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
326 if (!*found_textrel) return NULL;
327
328 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
329 text_void = elf_findsecbyname(elf, ".text");
330
331 if (symtab_void && strtab_void && text_void && elf->shdr) {
332 #define SHOW_TEXTRELS(B) \
333 if (elf->elf_class == ELFCLASS ## B) { \
334 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
335 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
336 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
337 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
338 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
339 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
340 uint ## B ## _t memsz = EGET(text->sh_size); \
341 Elf ## B ## _Rel *rel; \
342 Elf ## B ## _Rela *rela; \
343 /* search the section headers for relocations */ \
344 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
345 uint32_t sh_type = EGET(shdr[s].sh_type); \
346 if (sh_type == SHT_REL) { \
347 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \
348 rela = NULL; \
349 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
350 } else if (sh_type == SHT_RELA) { \
351 rel = NULL; \
352 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \
353 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
354 } else \
355 continue; \
356 /* now see if any of the relocs are in the .text */ \
357 for (r = 0; r < rmax; ++r) { \
358 unsigned long sym_max; \
359 Elf ## B ## _Addr offset_tmp; \
360 Elf ## B ## _Sym *func; \
361 Elf ## B ## _Sym *sym; \
362 Elf ## B ## _Addr r_offset; \
363 uint ## B ## _t r_info; \
364 if (sh_type == SHT_REL) { \
365 r_offset = EGET(rel[r].r_offset); \
366 r_info = EGET(rel[r].r_info); \
367 } else { \
368 r_offset = EGET(rela[r].r_offset); \
369 r_info = EGET(rela[r].r_info); \
370 } \
371 /* make sure this relocation is inside of the .text */ \
372 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
373 if (be_verbose <= 2) continue; \
374 } else \
375 *found_textrels = 1; \
376 /* locate this relocation symbol name */ \
377 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
378 if ((void*)sym > (void*)elf->data_end) { \
379 warn("%s: corrupt ELF symbol", elf->filename); \
380 continue; \
381 } \
382 sym_max = ELF ## B ## _R_SYM(r_info); \
383 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
384 sym += sym_max; \
385 else \
386 sym = NULL; \
387 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
388 /* show the raw details about this reloc */ \
389 printf(" %s: ", elf->base_filename); \
390 if (sym && sym->st_name) \
391 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \
392 else \
393 printf("(memory/fake?)"); \
394 printf(" [0x%lX]", (unsigned long)r_offset); \
395 /* now try to find the closest symbol that this rel is probably in */ \
396 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
397 func = NULL; \
398 offset_tmp = 0; \
399 while (sym_max--) { \
400 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
401 func = sym; \
402 offset_tmp = EGET(sym->st_value); \
403 } \
404 ++sym; \
405 } \
406 printf(" in "); \
407 if (func && func->st_name) \
408 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \
409 else \
410 printf("(NULL: fake?)"); \
411 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
412 if (be_verbose) { \
413 char *sysbuf; \
414 size_t syslen; \
415 const char sysfmt[] = "objdump -r -R -d -w -l --start-address=0x%lX --stop-address=0x%lX %s | grep --color -i -C 3 '.*[[:space:]]%lX:[[:space:]]*R_.*'\n"; \
416 syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
417 sysbuf = xmalloc(syslen); \
418 if (sysbuf) { \
419 snprintf(sysbuf, syslen, sysfmt, \
420 (unsigned long)offset_tmp, \
421 offset_tmp + EGET(func->st_size), \
422 elf->filename, \
423 (unsigned long)r_offset); \
424 system(sysbuf); \
425 free(sysbuf); \
426 } \
427 } \
428 } \
429 } }
430 SHOW_TEXTRELS(32)
431 SHOW_TEXTRELS(64)
432 }
433 if (!*found_textrels)
434 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
435
436 return NULL;
437 }
438
439 static void rpath_security_checks(elfobj *, char *, const char *);
440 static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
441 {
442 struct stat st;
443 switch (*item) {
444 case '/': break;
445 case '.':
446 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
447 break;
448 case ':':
449 case '\0':
450 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
451 break;
452 case '$':
453 if (fstat(elf->fd, &st) != -1)
454 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
455 warnf("Security problem with %s='%s' in %s with mode set of %o",
456 dt_type, item, elf->filename, st.st_mode & 07777);
457 break;
458 default:
459 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
460 break;
461 }
462 }
463 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
464 {
465 unsigned long i, s;
466 char *rpath, *runpath, **r;
467 void *strtbl_void;
468
469 if (!show_rpath) return;
470
471 strtbl_void = elf_findsecbyname(elf, ".dynstr");
472 rpath = runpath = NULL;
473
474 if (elf->phdr && strtbl_void) {
475 #define SHOW_RPATH(B) \
476 if (elf->elf_class == ELFCLASS ## B) { \
477 Elf ## B ## _Dyn *dyn; \
478 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
479 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
480 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
481 Elf ## B ## _Off offset; \
482 Elf ## B ## _Xword word; \
483 /* Scan all the program headers */ \
484 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
485 /* Just scan dynamic headers */ \
486 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
487 offset = EGET(phdr[i].p_offset); \
488 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
489 /* Just scan dynamic RPATH/RUNPATH headers */ \
490 dyn = DYN ## B (elf->data + offset); \
491 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
492 if (word == DT_RPATH) { \
493 r = &rpath; \
494 } else if (word == DT_RUNPATH) { \
495 r = &runpath; \
496 } else { \
497 ++dyn; \
498 continue; \
499 } \
500 /* Verify the memory is somewhat sane */ \
501 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
502 if (offset < (Elf ## B ## _Off)elf->len) { \
503 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
504 *r = (char*)(elf->data + offset); \
505 /* cache the length in case we need to nuke this section later on */ \
506 if (fix_elf) \
507 offset = strlen(*r); \
508 /* If quiet, don't output paths in ld.so.conf */ \
509 if (be_quiet) { \
510 size_t len; \
511 char *start, *end; \
512 /* note that we only 'chop' off leading known paths. */ \
513 /* since *r is read-only memory, we can only move the ptr forward. */ \
514 start = *r; \
515 /* scan each path in : delimited list */ \
516 while (start) { \
517 rpath_security_checks(elf, start, get_elfdtype(word)); \
518 end = strchr(start, ':'); \
519 len = (end ? abs(end - start) : strlen(start)); \
520 if (use_ldcache) \
521 for (s = 0; ldpaths[s]; ++s) \
522 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
523 *r = end; \
524 /* corner case ... if RPATH reads "/usr/lib:", we want \
525 * to show ':' rather than '' */ \
526 if (end && end[1] != '\0') \
527 (*r)++; \
528 break; \
529 } \
530 if (!*r || !end) \
531 break; \
532 else \
533 start = start + len + 1; \
534 } \
535 } \
536 if (*r) { \
537 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
538 /* just nuke it */ \
539 nuke_it##B: \
540 memset(*r, 0x00, offset); \
541 *r = NULL; \
542 ESET(dyn->d_tag, DT_DEBUG); \
543 ESET(dyn->d_un.d_ptr, 0); \
544 } else if (fix_elf) { \
545 /* try to clean "bad" paths */ \
546 size_t len, tmpdir_len; \
547 char *start, *end; \
548 const char *tmpdir; \
549 start = *r; \
550 tmpdir = (getenv("TMPDIR") ? : "."); \
551 tmpdir_len = strlen(tmpdir); \
552 while (1) { \
553 end = strchr(start, ':'); \
554 if (start == end) { \
555 eat_this_path##B: \
556 len = strlen(end); \
557 memmove(start, end+1, len); \
558 start[len-1] = '\0'; \
559 end = start - 1; \
560 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
561 if (!end) { \
562 if (start == *r) \
563 goto nuke_it##B; \
564 *--start = '\0'; \
565 } else \
566 goto eat_this_path##B; \
567 } \
568 if (!end) \
569 break; \
570 start = end + 1; \
571 } \
572 if (**r == '\0') \
573 goto nuke_it##B; \
574 } \
575 if (*r) \
576 *found_rpath = 1; \
577 } \
578 } \
579 ++dyn; \
580 } \
581 } }
582 SHOW_RPATH(32)
583 SHOW_RPATH(64)
584 }
585
586 if (be_wewy_wewy_quiet) return;
587
588 if (rpath && runpath) {
589 if (!strcmp(rpath, runpath)) {
590 xstrcat(ret, runpath, ret_len);
591 } else {
592 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
593 xchrcat(ret, '{', ret_len);
594 xstrcat(ret, rpath, ret_len);
595 xchrcat(ret, ',', ret_len);
596 xstrcat(ret, runpath, ret_len);
597 xchrcat(ret, '}', ret_len);
598 }
599 } else if (rpath || runpath)
600 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
601 else if (!be_quiet)
602 xstrcat(ret, " - ", ret_len);
603 }
604
605 #define LDSO_CACHE_MAGIC "ld.so-"
606 #define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
607 #define LDSO_CACHE_VER "1.7.0"
608 #define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
609 #define FLAG_ANY -1
610 #define FLAG_TYPE_MASK 0x00ff
611 #define FLAG_LIBC4 0x0000
612 #define FLAG_ELF 0x0001
613 #define FLAG_ELF_LIBC5 0x0002
614 #define FLAG_ELF_LIBC6 0x0003
615 #define FLAG_REQUIRED_MASK 0xff00
616 #define FLAG_SPARC_LIB64 0x0100
617 #define FLAG_IA64_LIB64 0x0200
618 #define FLAG_X8664_LIB64 0x0300
619 #define FLAG_S390_LIB64 0x0400
620 #define FLAG_POWERPC_LIB64 0x0500
621 #define FLAG_MIPS64_LIBN32 0x0600
622 #define FLAG_MIPS64_LIBN64 0x0700
623
624 static char *lookup_cache_lib(elfobj *, char *);
625
626 #if defined(__GLIBC__) || defined(__UCLIBC__)
627
628 static char *lookup_cache_lib(elfobj *elf, char *fname)
629 {
630 int fd = 0;
631 char *strs;
632 static char buf[__PAX_UTILS_PATH_MAX] = "";
633 const char *cachefile = "/etc/ld.so.cache";
634 struct stat st;
635
636 typedef struct {
637 char magic[LDSO_CACHE_MAGIC_LEN];
638 char version[LDSO_CACHE_VER_LEN];
639 int nlibs;
640 } header_t;
641 header_t *header;
642
643 typedef struct {
644 int flags;
645 int sooffset;
646 int liboffset;
647 } libentry_t;
648 libentry_t *libent;
649
650 if (fname == NULL)
651 return NULL;
652
653 if (ldcache == 0) {
654 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1)
655 return NULL;
656
657 /* cache these values so we only map/unmap the cache file once */
658 ldcache_size = st.st_size;
659 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
660
661 close(fd);
662
663 if (ldcache == (caddr_t)-1) {
664 ldcache = 0;
665 return NULL;
666 }
667
668 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
669 return NULL;
670 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
671 return NULL;
672 }
673
674 header = (header_t *) ldcache;
675 libent = (libentry_t *) (ldcache + sizeof(header_t));
676 strs = (char *) &libent[header->nlibs];
677
678 for (fd = 0; fd < header->nlibs; fd++) {
679 /* this should be more fine grained, but for now we assume that
680 * diff arches will not be cached together. and we ignore the
681 * the different multilib mips cases. */
682 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
683 continue;
684 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
685 continue;
686
687 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
688 continue;
689 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
690 }
691 return buf;
692 }
693 #elif defined(__NetBSD__)
694 static char *lookup_cache_lib(elfobj *elf, char *fname)
695 {
696 static char buf[__PAX_UTILS_PATH_MAX] = "";
697 static struct stat st;
698
699 char **ldpath;
700 for (ldpath = ldpaths; *ldpath != NULL; ldpath++) {
701 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", *ldpath, fname) >= sizeof(buf))
702 continue; /* if the pathname is too long, or something went wrong, ignore */
703
704 if (stat(buf, &st) != 0)
705 continue; /* if the lib doesn't exist in *ldpath, look further */
706
707 /* NetBSD doesn't actually do sanity checks, it just loads the file
708 * and if that doesn't work, continues looking in other directories.
709 * This cannot easily be safely emulated, unfortunately. For now,
710 * just assume that if it exists, it's a valid library. */
711
712 return buf;
713 }
714
715 /* not found in any path */
716 return NULL;
717 }
718 #else
719 #warning Cache support not implemented for your target
720 static char *lookup_cache_lib(elfobj *elf, char *fname)
721 {
722 return NULL;
723 }
724 #endif
725
726 static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
727 {
728 unsigned long i;
729 char *needed;
730 void *strtbl_void;
731 char *p;
732
733 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
734
735 strtbl_void = elf_findsecbyname(elf, ".dynstr");
736
737 if (elf->phdr && strtbl_void) {
738 #define SHOW_NEEDED(B) \
739 if (elf->elf_class == ELFCLASS ## B) { \
740 Elf ## B ## _Dyn *dyn; \
741 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
742 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
743 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
744 Elf ## B ## _Off offset; \
745 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
746 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
747 offset = EGET(phdr[i].p_offset); \
748 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
749 dyn = DYN ## B (elf->data + offset); \
750 while (EGET(dyn->d_tag) != DT_NULL) { \
751 if (EGET(dyn->d_tag) == DT_NEEDED) { \
752 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
753 if (offset >= (Elf ## B ## _Off)elf->len) { \
754 ++dyn; \
755 continue; \
756 } \
757 needed = (char*)(elf->data + offset); \
758 if (op == 0) { \
759 if (!be_wewy_wewy_quiet) { \
760 if (*found_needed) xchrcat(ret, ',', ret_len); \
761 if (use_ldcache) \
762 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
763 needed = p; \
764 xstrcat(ret, needed, ret_len); \
765 } \
766 *found_needed = 1; \
767 } else { \
768 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \
769 *found_lib = 1; \
770 return (be_wewy_wewy_quiet ? NULL : needed); \
771 } \
772 } \
773 } \
774 ++dyn; \
775 } \
776 } }
777 SHOW_NEEDED(32)
778 SHOW_NEEDED(64)
779 if (op == 0 && !*found_needed && be_verbose)
780 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
781 }
782
783 return NULL;
784 }
785 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
786 {
787 void *strtbl_void;
788
789 if (!show_interp) return NULL;
790
791 strtbl_void = elf_findsecbyname(elf, ".interp");
792
793 if (strtbl_void) {
794 #define SHOW_INTERP(B) \
795 if (elf->elf_class == ELFCLASS ## B) { \
796 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
797 *found_interp = 1; \
798 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
799 }
800 SHOW_INTERP(32)
801 SHOW_INTERP(64)
802 }
803 return NULL;
804 }
805 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
806 {
807 unsigned long i;
808 struct stat s;
809 char dynamic = 0;
810
811 if (!show_bind) return NULL;
812 if (!elf->phdr) return NULL;
813
814 #define SHOW_BIND(B) \
815 if (elf->elf_class == ELFCLASS ## B) { \
816 Elf ## B ## _Dyn *dyn; \
817 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
818 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
819 Elf ## B ## _Off offset; \
820 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
821 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
822 dynamic = 1; \
823 offset = EGET(phdr[i].p_offset); \
824 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
825 dyn = DYN ## B (elf->data + offset); \
826 while (EGET(dyn->d_tag) != DT_NULL) { \
827 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
828 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
829 { \
830 if (be_quiet) return NULL; \
831 *found_bind = 1; \
832 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
833 } \
834 ++dyn; \
835 } \
836 } \
837 }
838 SHOW_BIND(32)
839 SHOW_BIND(64)
840
841 if (be_wewy_wewy_quiet) return NULL;
842
843 /* don't output anything if quiet mode and the ELF is static or not setuid */
844 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
845 return NULL;
846 } else {
847 *found_bind = 1;
848 return (char *) (dynamic ? "LAZY" : "STATIC");
849 }
850 }
851 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
852 {
853 unsigned long i;
854 char *soname;
855 void *strtbl_void;
856
857 if (!show_soname) return NULL;
858
859 strtbl_void = elf_findsecbyname(elf, ".dynstr");
860
861 if (elf->phdr && strtbl_void) {
862 #define SHOW_SONAME(B) \
863 if (elf->elf_class == ELFCLASS ## B) { \
864 Elf ## B ## _Dyn *dyn; \
865 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
866 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
867 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
868 Elf ## B ## _Off offset; \
869 /* only look for soname in shared objects */ \
870 if (ehdr->e_type != ET_DYN) \
871 return NULL; \
872 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
873 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
874 offset = EGET(phdr[i].p_offset); \
875 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
876 dyn = DYN ## B (elf->data + offset); \
877 while (EGET(dyn->d_tag) != DT_NULL) { \
878 if (EGET(dyn->d_tag) == DT_SONAME) { \
879 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
880 if (offset >= (Elf ## B ## _Off)elf->len) { \
881 ++dyn; \
882 continue; \
883 } \
884 soname = (char*)(elf->data + offset); \
885 *found_soname = 1; \
886 return (be_wewy_wewy_quiet ? NULL : soname); \
887 } \
888 ++dyn; \
889 } \
890 } }
891 SHOW_SONAME(32)
892 SHOW_SONAME(64)
893 }
894
895 return NULL;
896 }
897 static char *scanelf_file_sym(elfobj *elf, char *found_sym)
898 {
899 unsigned long i;
900 char *ret;
901 void *symtab_void, *strtab_void;
902
903 if (!find_sym) return NULL;
904 ret = find_sym;
905
906 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
907
908 if (symtab_void && strtab_void) {
909 #define FIND_SYM(B) \
910 if (elf->elf_class == ELFCLASS ## B) { \
911 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
912 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
913 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
914 unsigned long cnt = EGET(symtab->sh_entsize); \
915 char *symname; \
916 if (cnt) \
917 cnt = EGET(symtab->sh_size) / cnt; \
918 for (i = 0; i < cnt; ++i) { \
919 if (sym->st_name) { \
920 /* make sure the symbol name is in acceptable memory range */ \
921 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
922 if ((void*)symname > (void*)elf->data_end) { \
923 warnf("%s: corrupt ELF symbols", elf->filename); \
924 ++sym; \
925 continue; \
926 } \
927 /* debug display ... show all symbols and some extra info */ \
928 if (*ret == '*') { \
929 printf("%s(%s) %5lX %15s %s\n", \
930 ((*found_sym == 0) ? "\n\t" : "\t"), \
931 elf->base_filename, \
932 (unsigned long)sym->st_size, \
933 get_elfstttype(sym->st_info), \
934 symname); \
935 *found_sym = 1; \
936 } else { \
937 /* allow the user to specify a comma delimited list of symbols to search for */ \
938 char *this_sym, *this_sym_ver, *next_sym; \
939 this_sym = ret; \
940 this_sym_ver = versioned_symname; \
941 do { \
942 next_sym = strchr(this_sym, ','); \
943 if (next_sym == NULL) \
944 next_sym = this_sym + strlen(this_sym); \
945 /* do we want a defined symbol ? */ \
946 if (*this_sym == '+') { \
947 if (sym->st_shndx == SHN_UNDEF) \
948 goto skip_this_sym##B; \
949 ++this_sym; \
950 ++this_sym_ver; \
951 /* do we want an undefined symbol ? */ \
952 } else if (*this_sym == '-') { \
953 if (sym->st_shndx != SHN_UNDEF) \
954 goto skip_this_sym##B; \
955 ++this_sym; \
956 ++this_sym_ver; \
957 } \
958 /* ok, lets compare the name now */ \
959 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
960 (strncmp(this_sym_ver, symname, strlen(this_sym_ver)) == 0)) { \
961 if (be_semi_verbose) { \
962 char buf[126]; \
963 snprintf(buf, sizeof(buf), "%lX %s %s", \
964 (unsigned long)sym->st_size, get_elfstttype(sym->st_info), this_sym); \
965 ret = buf; \
966 } else \
967 ret = this_sym; \
968 (*found_sym)++; \
969 goto break_out; \
970 } \
971 skip_this_sym##B: this_sym = next_sym + 1; \
972 } while (*next_sym != '\0'); \
973 } \
974 } \
975 ++sym; \
976 } }
977 FIND_SYM(32)
978 FIND_SYM(64)
979 }
980
981 break_out:
982 if (be_wewy_wewy_quiet) return NULL;
983
984 if (*find_sym != '*' && *found_sym)
985 return ret;
986 if (be_quiet)
987 return NULL;
988 else
989 return (char *)" - ";
990 }
991
992
993 static char *scanelf_file_sections(elfobj *elf, char *found_section)
994 {
995 if (!find_section)
996 return NULL;
997
998 #define FIND_SECTION(B) \
999 if (elf->elf_class == ELFCLASS ## B) { \
1000 int invert; \
1001 Elf ## B ## _Shdr *section; \
1002 invert = (*find_section == '!' ? 1 : 0); \
1003 section = SHDR ## B (elf_findsecbyname(elf, find_section+invert)); \
1004 if ((section == NULL && invert) || (section != NULL && !invert)) \
1005 *found_section = 1; \
1006 }
1007 FIND_SECTION(32)
1008 FIND_SECTION(64)
1009
1010 if (be_wewy_wewy_quiet)
1011 return NULL;
1012
1013 if (*found_section)
1014 return find_section;
1015
1016 if (be_quiet)
1017 return NULL;
1018 else
1019 return (char *)" - ";
1020 }
1021
1022 /* scan an elf file and show all the fun stuff */
1023 #define prints(str) write(fileno(stdout), str, strlen(str))
1024 static int scanelf_elfobj(elfobj *elf)
1025 {
1026 unsigned long i;
1027 char found_pax, found_phdr, found_relro, found_load, found_textrel,
1028 found_rpath, found_needed, found_interp, found_bind, found_soname,
1029 found_sym, found_lib, found_file, found_textrels, found_section;
1030 static char *out_buffer = NULL;
1031 static size_t out_len;
1032
1033 found_pax = found_phdr = found_relro = found_load = found_textrel = \
1034 found_rpath = found_needed = found_interp = found_bind = found_soname = \
1035 found_sym = found_lib = found_file = found_textrels = found_section = 0;
1036
1037 if (be_verbose > 2)
1038 printf("%s: scanning file {%s,%s}\n", elf->filename,
1039 get_elfeitype(EI_CLASS, elf->elf_class),
1040 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
1041 else if (be_verbose > 1)
1042 printf("%s: scanning file\n", elf->filename);
1043
1044 /* init output buffer */
1045 if (!out_buffer) {
1046 out_len = sizeof(char) * 80;
1047 out_buffer = (char*)xmalloc(out_len);
1048 }
1049 *out_buffer = '\0';
1050
1051 /* show the header */
1052 if (!be_quiet && show_banner) {
1053 for (i = 0; out_format[i]; ++i) {
1054 if (!IS_MODIFIER(out_format[i])) continue;
1055
1056 switch (out_format[++i]) {
1057 case '+': break;
1058 case '%': break;
1059 case '#': break;
1060 case 'F':
1061 case 'p':
1062 case 'f': prints("FILE "); found_file = 1; break;
1063 case 'o': prints(" TYPE "); break;
1064 case 'x': prints(" PAX "); break;
1065 case 'e': prints("STK/REL/PTL "); break;
1066 case 't': prints("TEXTREL "); break;
1067 case 'r': prints("RPATH "); break;
1068 case 'n': prints("NEEDED "); break;
1069 case 'i': prints("INTERP "); break;
1070 case 'b': prints("BIND "); break;
1071 case 'S': prints("SONAME "); break;
1072 case 's': prints("SYM "); break;
1073 case 'N': prints("LIB "); break;
1074 case 'T': prints("TEXTRELS "); break;
1075 case 'k': prints("SECTION "); break;
1076 case 'a': prints("ARCH "); break;
1077 default: warnf("'%c' has no title ?", out_format[i]);
1078 }
1079 }
1080 if (!found_file) prints("FILE ");
1081 prints("\n");
1082 found_file = 0;
1083 show_banner = 0;
1084 }
1085
1086 /* dump all the good stuff */
1087 for (i = 0; out_format[i]; ++i) {
1088 const char *out;
1089 const char *tmp;
1090
1091 if (!IS_MODIFIER(out_format[i])) {
1092 xchrcat(&out_buffer, out_format[i], &out_len);
1093 continue;
1094 }
1095
1096 out = NULL;
1097 be_wewy_wewy_quiet = (out_format[i] == '#');
1098 be_semi_verbose = (out_format[i] == '+');
1099 switch (out_format[++i]) {
1100 case '+':
1101 case '%':
1102 case '#':
1103 xchrcat(&out_buffer, out_format[i], &out_len); break;
1104 case 'F':
1105 found_file = 1;
1106 if (be_wewy_wewy_quiet) break;
1107 xstrcat(&out_buffer, elf->filename, &out_len);
1108 break;
1109 case 'p':
1110 found_file = 1;
1111 if (be_wewy_wewy_quiet) break;
1112 tmp = elf->filename;
1113 if (search_path) {
1114 ssize_t len_search = strlen(search_path);
1115 ssize_t len_file = strlen(elf->filename);
1116 if (!strncmp(elf->filename, search_path, len_search) && \
1117 len_file > len_search)
1118 tmp += len_search;
1119 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1120 }
1121 xstrcat(&out_buffer, tmp, &out_len);
1122 break;
1123 case 'f':
1124 found_file = 1;
1125 if (be_wewy_wewy_quiet) break;
1126 tmp = strrchr(elf->filename, '/');
1127 tmp = (tmp == NULL ? elf->filename : tmp+1);
1128 xstrcat(&out_buffer, tmp, &out_len);
1129 break;
1130 case 'o': out = get_elfetype(elf); break;
1131 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
1132 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
1133 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1134 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
1135 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1136 case 'n':
1137 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
1138 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1139 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1140 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
1141 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1142 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1143 case 'a': out = get_elfemtype(elf); break;
1144 default: warnf("'%c' has no scan code?", out_format[i]);
1145 }
1146 if (out) {
1147 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
1148 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
1149 xstrncat(&out_buffer, out, &out_len, (tmp-out));
1150 else
1151 xstrcat(&out_buffer, out, &out_len);
1152 }
1153 }
1154
1155 #define FOUND_SOMETHING() \
1156 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1157 found_rpath || found_needed || found_interp || found_bind || \
1158 found_soname || found_sym || found_lib || found_textrels || found_section )
1159
1160 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1161 xchrcat(&out_buffer, ' ', &out_len);
1162 xstrcat(&out_buffer, elf->filename, &out_len);
1163 }
1164 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
1165 puts(out_buffer);
1166 fflush(stdout);
1167 }
1168
1169 return 0;
1170 }
1171
1172 /* scan a single elf */
1173 static int scanelf_elf(const char *filename, int fd, size_t len)
1174 {
1175 int ret = 1;
1176 elfobj *elf;
1177
1178 /* verify this is real ELF */
1179 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1180 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1181 return ret;
1182 }
1183 switch (match_bits) {
1184 case 32:
1185 if (elf->elf_class != ELFCLASS32)
1186 goto label_done;
1187 break;
1188 case 64:
1189 if (elf->elf_class != ELFCLASS64)
1190 goto label_done;
1191 break;
1192 default: break;
1193 }
1194 if (strlen(match_etypes)) {
1195 char sbuf[126];
1196 strncpy(sbuf, match_etypes, sizeof(sbuf));
1197 if (strchr(match_etypes, ',') != NULL) {
1198 char *p;
1199 while((p = strrchr(sbuf, ',')) != NULL) {
1200 *p = 0;
1201 if (etype_lookup(p+1) == get_etype(elf))
1202 goto label_ret;
1203 }
1204 }
1205 if (etype_lookup(sbuf) != get_etype(elf))
1206 goto label_done;
1207 }
1208
1209 label_ret:
1210 ret = scanelf_elfobj(elf);
1211
1212 label_done:
1213 unreadelf(elf);
1214 return ret;
1215 }
1216
1217 /* scan an archive of elfs */
1218 static int scanelf_archive(const char *filename, int fd, size_t len)
1219 {
1220 archive_handle *ar;
1221 archive_member *m;
1222 char *ar_buffer;
1223 elfobj *elf;
1224
1225 ar = ar_open_fd(filename, fd);
1226 if (ar == NULL)
1227 return 1;
1228
1229 ar_buffer = (char*)mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1230 while ((m=ar_next(ar)) != NULL) {
1231 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size);
1232 if (elf) {
1233 scanelf_elfobj(elf);
1234 unreadelf(elf);
1235 }
1236 }
1237 munmap(ar_buffer, len);
1238
1239 return 0;
1240 }
1241 /* scan a file which may be an elf or an archive or some other magical beast */
1242 static int scanelf_file(const char *filename, const struct stat *st_cache)
1243 {
1244 const struct stat *st = st_cache;
1245 struct stat symlink_st;
1246 int fd;
1247
1248 /* always handle regular files and handle symlinked files if no -y */
1249 if (S_ISLNK(st->st_mode)) {
1250 if (!scan_symlink) return 1;
1251 stat(filename, &symlink_st);
1252 st = &symlink_st;
1253 }
1254
1255 if (!S_ISREG(st->st_mode)) {
1256 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1257 return 1;
1258 }
1259
1260 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1261 return 1;
1262
1263 if (scanelf_elf(filename, fd, st->st_size) == 1 && scan_archives)
1264 /* if it isn't an ELF, maybe it's an .a archive */
1265 scanelf_archive(filename, fd, st->st_size);
1266
1267 close(fd);
1268 return 0;
1269 }
1270
1271 /* scan a directory for ET_EXEC files and print when we find one */
1272 static int scanelf_dir(const char *path)
1273 {
1274 register DIR *dir;
1275 register struct dirent *dentry;
1276 struct stat st_top, st;
1277 char buf[__PAX_UTILS_PATH_MAX];
1278 size_t pathlen = 0, len = 0;
1279 int ret = 0;
1280
1281 /* make sure path exists */
1282 if (lstat(path, &st_top) == -1) {
1283 if (be_verbose > 2) printf("%s: does not exist\n", path);
1284 return 1;
1285 }
1286
1287 /* ok, if it isn't a directory, assume we can open it */
1288 if (!S_ISDIR(st_top.st_mode)) {
1289 return scanelf_file(path, &st_top);
1290 }
1291
1292 /* now scan the dir looking for fun stuff */
1293 if ((dir = opendir(path)) == NULL) {
1294 warnf("could not opendir %s: %s", path, strerror(errno));
1295 return 1;
1296 }
1297 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1298
1299 pathlen = strlen(path);
1300 while ((dentry = readdir(dir))) {
1301 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1302 continue;
1303 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
1304 if (len >= sizeof(buf)) {
1305 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1306 (unsigned long)len, (unsigned long)sizeof(buf));
1307 continue;
1308 }
1309 snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name);
1310 if (lstat(buf, &st) != -1) {
1311 if (S_ISREG(st.st_mode))
1312 ret = scanelf_file(buf, &st);
1313 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1314 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1315 ret = scanelf_dir(buf);
1316 }
1317 }
1318 }
1319 closedir(dir);
1320 return ret;
1321 }
1322
1323 static int scanelf_from_file(const char *filename)
1324 {
1325 FILE *fp = NULL;
1326 char *p;
1327 char path[__PAX_UTILS_PATH_MAX];
1328 int ret = 0;
1329
1330 if (strcmp(filename, "-") == 0)
1331 fp = stdin;
1332 else if ((fp = fopen(filename, "r")) == NULL)
1333 return 1;
1334
1335 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1336 if ((p = strchr(path, '\n')) != NULL)
1337 *p = 0;
1338 search_path = path;
1339 ret = scanelf_dir(path);
1340 }
1341 if (fp != stdin)
1342 fclose(fp);
1343 return ret;
1344 }
1345
1346 #if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1347
1348 static int load_ld_cache_config(int i, const char *fname)
1349 {
1350 FILE *fp = NULL;
1351 char *p;
1352 char path[__PAX_UTILS_PATH_MAX];
1353
1354 if (i + 1 == ARRAY_SIZE(ldpaths))
1355 return i;
1356
1357 if ((fp = fopen(fname, "r")) == NULL)
1358 return i;
1359
1360 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1361 if ((p = strrchr(path, '\r')) != NULL)
1362 *p = 0;
1363 if ((p = strchr(path, '\n')) != NULL)
1364 *p = 0;
1365 #ifdef __linux__
1366 // recursive includes of the same file will make this segfault.
1367 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1368 glob64_t gl;
1369 size_t x;
1370 char gpath[__PAX_UTILS_PATH_MAX];
1371
1372 memset(gpath, 0, sizeof(gpath));
1373
1374 if (path[8] != '/')
1375 snprintf(gpath, sizeof(gpath), "/etc/%s", &path[8]);
1376 else
1377 strncpy(gpath, &path[8], sizeof(gpath));
1378
1379 if ((glob64(gpath, 0, NULL, &gl)) == 0) {
1380 for (x = 0; x < gl.gl_pathc; ++x) {
1381 /* try to avoid direct loops */
1382 if (strcmp(gl.gl_pathv[x], fname) == 0)
1383 continue;
1384 i = load_ld_cache_config(i, gl.gl_pathv[x]);
1385 if (i + 1 >= ARRAY_SIZE(ldpaths)) {
1386 globfree64(&gl);
1387 return i;
1388 }
1389 }
1390 globfree64 (&gl);
1391 continue;
1392 }
1393 }
1394 #endif
1395 if (*path != '/')
1396 continue;
1397
1398 ldpaths[i++] = xstrdup(path);
1399
1400 if (i + 1 == ARRAY_SIZE(ldpaths))
1401 break;
1402 }
1403 ldpaths[i] = NULL;
1404
1405 fclose(fp);
1406 return i;
1407 }
1408
1409 #elif defined(__FreeBSD__) || (__DragonFly__)
1410
1411 static int load_ld_cache_config(int i, const char *fname)
1412 {
1413 FILE *fp = NULL;
1414 char *b = NULL, *p;
1415 struct elfhints_hdr hdr;
1416
1417 if (i + 1 == ARRAY_SIZE(ldpaths))
1418 return i;
1419
1420 if ((fp = fopen(fname, "r")) == NULL)
1421 return i;
1422
1423 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1424 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1425 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1426 {
1427 fclose(fp);
1428 return i;
1429 }
1430
1431 b = (char*)malloc(hdr.dirlistlen+1);
1432 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1433 fclose(fp);
1434 free(b);
1435 return i;
1436 }
1437
1438 while ((p = strsep(&b, ":"))) {
1439 if (*p == '\0') continue;
1440 ldpaths[i++] = xstrdup(p);
1441
1442 if (i + 1 == ARRAY_SIZE(ldpaths))
1443 break;
1444 }
1445 ldpaths[i] = NULL;
1446
1447 free(b);
1448 fclose(fp);
1449 return i;
1450 }
1451
1452 #else
1453
1454 #warning Cache config support not implemented for your target
1455 static int load_ld_cache_config(int i, const char *fname)
1456 {
1457 memset(ldpaths, 0x00, sizeof(ldpaths));
1458 }
1459
1460 #endif
1461
1462 /* scan /etc/ld.so.conf for paths */
1463 static void scanelf_ldpath()
1464 {
1465 char scan_l, scan_ul, scan_ull;
1466 int i = 0;
1467
1468 if (!ldpaths[0])
1469 err("Unable to load any paths from ld.so.conf");
1470
1471 scan_l = scan_ul = scan_ull = 0;
1472
1473 while (ldpaths[i]) {
1474 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
1475 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
1476 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
1477 scanelf_dir(ldpaths[i]);
1478 ++i;
1479 }
1480
1481 if (!scan_l) scanelf_dir("/lib");
1482 if (!scan_ul) scanelf_dir("/usr/lib");
1483 if (!scan_ull) scanelf_dir("/usr/local/lib");
1484 }
1485
1486 /* scan env PATH for paths */
1487 static void scanelf_envpath()
1488 {
1489 char *path, *p;
1490
1491 path = getenv("PATH");
1492 if (!path)
1493 err("PATH is not set in your env !");
1494 path = xstrdup(path);
1495
1496 while ((p = strrchr(path, ':')) != NULL) {
1497 scanelf_dir(p + 1);
1498 *p = 0;
1499 }
1500
1501 free(path);
1502 }
1503
1504 /* usage / invocation handling functions */
1505 #define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:BhV"
1506 #define a_argument required_argument
1507 static struct option const long_opts[] = {
1508 {"path", no_argument, NULL, 'p'},
1509 {"ldpath", no_argument, NULL, 'l'},
1510 {"recursive", no_argument, NULL, 'R'},
1511 {"mount", no_argument, NULL, 'm'},
1512 {"symlink", no_argument, NULL, 'y'},
1513 {"archives", no_argument, NULL, 'A'},
1514 {"ldcache", no_argument, NULL, 'L'},
1515 {"fix", no_argument, NULL, 'X'},
1516 {"setpax", a_argument, NULL, 'z'},
1517 {"pax", no_argument, NULL, 'x'},
1518 {"header", no_argument, NULL, 'e'},
1519 {"textrel", no_argument, NULL, 't'},
1520 {"rpath", no_argument, NULL, 'r'},
1521 {"needed", no_argument, NULL, 'n'},
1522 {"interp", no_argument, NULL, 'i'},
1523 {"bind", no_argument, NULL, 'b'},
1524 {"soname", no_argument, NULL, 'S'},
1525 {"symbol", a_argument, NULL, 's'},
1526 {"section", a_argument, NULL, 'k'},
1527 {"lib", a_argument, NULL, 'N'},
1528 {"gmatch", no_argument, NULL, 'g'},
1529 {"textrels", no_argument, NULL, 'T'},
1530 {"etype", a_argument, NULL, 'E'},
1531 {"bits", a_argument, NULL, 'M'},
1532 {"all", no_argument, NULL, 'a'},
1533 {"quiet", no_argument, NULL, 'q'},
1534 {"verbose", no_argument, NULL, 'v'},
1535 {"format", a_argument, NULL, 'F'},
1536 {"from", a_argument, NULL, 'f'},
1537 {"file", a_argument, NULL, 'o'},
1538 {"nobanner", no_argument, NULL, 'B'},
1539 {"help", no_argument, NULL, 'h'},
1540 {"version", no_argument, NULL, 'V'},
1541 {NULL, no_argument, NULL, 0x0}
1542 };
1543
1544 static const char *opts_help[] = {
1545 "Scan all directories in PATH environment",
1546 "Scan all directories in /etc/ld.so.conf",
1547 "Scan directories recursively",
1548 "Don't recursively cross mount points",
1549 "Don't scan symlinks",
1550 "Scan archives (.a files)",
1551 "Utilize ld.so.cache information (use with -r/-n)",
1552 "Try and 'fix' bad things (use with -r/-e)",
1553 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1554 "Print PaX markings",
1555 "Print GNU_STACK/PT_LOAD markings",
1556 "Print TEXTREL information",
1557 "Print RPATH information",
1558 "Print NEEDED information",
1559 "Print INTERP information",
1560 "Print BIND information",
1561 "Print SONAME information",
1562 "Find a specified symbol",
1563 "Find a specified section",
1564 "Find a specified library",
1565 "Use strncmp to match libraries. (use with -N)",
1566 "Locate cause of TEXTREL",
1567 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1568 "Print only ELF files matching numeric bits",
1569 "Print all scanned info (-x -e -t -r -b)\n",
1570 "Only output 'bad' things",
1571 "Be verbose (can be specified more than once)",
1572 "Use specified format for output",
1573 "Read input stream from a filename",
1574 "Write output stream to a filename",
1575 "Don't display the header",
1576 "Print this help and exit",
1577 "Print version and exit",
1578 NULL
1579 };
1580
1581 /* display usage and exit */
1582 static void usage(int status)
1583 {
1584 unsigned long i;
1585 printf("* Scan ELF binaries for stuff\n\n"
1586 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1587 printf("Options: -[%s]\n", PARSE_FLAGS);
1588 for (i = 0; long_opts[i].name; ++i)
1589 if (long_opts[i].has_arg == no_argument)
1590 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
1591 long_opts[i].name, opts_help[i]);
1592 else
1593 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
1594 long_opts[i].name, opts_help[i]);
1595
1596 if (status != EXIT_SUCCESS)
1597 exit(status);
1598
1599 puts("\nThe format modifiers for the -F option are:");
1600 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1601 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1602 puts(" i INTERP \tb BIND \ts symbol");
1603 puts(" N library \to Type \tT TEXTRELs");
1604 puts(" S SONAME \tk section \ta arch");
1605 puts(" p filename (with search path removed)");
1606 puts(" f filename (short name/basename)");
1607 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1608
1609 puts("\nELF Etypes:");
1610 print_etypes(stdout);
1611
1612 exit(status);
1613 }
1614
1615 /* parse command line arguments and preform needed actions */
1616 #define do_pax_state(option, flag) \
1617 if (islower(option)) { \
1618 flags &= ~PF_##flag; \
1619 flags |= PF_NO##flag; \
1620 } else { \
1621 flags &= ~PF_NO##flag; \
1622 flags |= PF_##flag; \
1623 }
1624 static int parseargs(int argc, char *argv[])
1625 {
1626 int i;
1627 const char *from_file = NULL;
1628 int ret = 0;
1629
1630 opterr = 0;
1631 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1632 switch (i) {
1633
1634 case 'V':
1635 printf("pax-utils-%s: %s compiled %s\n%s\n"
1636 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
1637 VERSION, __FILE__, __DATE__, rcsid, argv0);
1638 exit(EXIT_SUCCESS);
1639 break;
1640 case 'h': usage(EXIT_SUCCESS); break;
1641 case 'f':
1642 if (from_file) warn("You prob don't want to specify -f twice");
1643 from_file = optarg;
1644 break;
1645 case 'E':
1646 strncpy(match_etypes, optarg, sizeof(match_etypes));
1647 break;
1648 case 'M':
1649 match_bits = atoi(optarg);
1650 break;
1651 case 'o': {
1652 if (freopen(optarg, "w", stdout) == NULL)
1653 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1654 break;
1655 }
1656 case 'k':
1657 if (find_section) warn("You prob don't want to specify -k twice");
1658 find_section = optarg;
1659 break;
1660 case 's': {
1661 if (find_sym) warn("You prob don't want to specify -s twice");
1662 find_sym = optarg;
1663 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1664 sprintf(versioned_symname, "%s@", find_sym);
1665 break;
1666 }
1667 case 'N': {
1668 if (find_lib) warn("You prob don't want to specify -N twice");
1669 find_lib = optarg;
1670 break;
1671 }
1672
1673 case 'F': {
1674 if (out_format) warn("You prob don't want to specify -F twice");
1675 out_format = optarg;
1676 break;
1677 }
1678 case 'z': {
1679 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1680 size_t x;
1681
1682 for (x = 0 ; x < strlen(optarg); x++) {
1683 switch(optarg[x]) {
1684 case 'p':
1685 case 'P':
1686 do_pax_state(optarg[x], PAGEEXEC);
1687 break;
1688 case 's':
1689 case 'S':
1690 do_pax_state(optarg[x], SEGMEXEC);
1691 break;
1692 case 'm':
1693 case 'M':
1694 do_pax_state(optarg[x], MPROTECT);
1695 break;
1696 case 'e':
1697 case 'E':
1698 do_pax_state(optarg[x], EMUTRAMP);
1699 break;
1700 case 'r':
1701 case 'R':
1702 do_pax_state(optarg[x], RANDMMAP);
1703 break;
1704 case 'x':
1705 case 'X':
1706 do_pax_state(optarg[x], RANDEXEC);
1707 break;
1708 default:
1709 break;
1710 }
1711 }
1712 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
1713 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
1714 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
1715 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
1716 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1717 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1718 setpax = flags;
1719 break;
1720 }
1721 case 'g': gmatch = 1; break;
1722 case 'L': use_ldcache = 1; break;
1723 case 'y': scan_symlink = 0; break;
1724 case 'A': scan_archives = 1; break;
1725 case 'B': show_banner = 0; break;
1726 case 'l': scan_ldpath = 1; break;
1727 case 'p': scan_envpath = 1; break;
1728 case 'R': dir_recurse = 1; break;
1729 case 'm': dir_crossmount = 0; break;
1730 case 'X': ++fix_elf; break;
1731 case 'x': show_pax = 1; break;
1732 case 'e': show_phdr = 1; break;
1733 case 't': show_textrel = 1; break;
1734 case 'r': show_rpath = 1; break;
1735 case 'n': show_needed = 1; break;
1736 case 'i': show_interp = 1; break;
1737 case 'b': show_bind = 1; break;
1738 case 'S': show_soname = 1; break;
1739 case 'T': show_textrels = 1; break;
1740 case 'q': be_quiet = 1; break;
1741 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1742 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
1743
1744 case ':':
1745 err("Option '%c' is missing parameter", optopt);
1746 case '?':
1747 err("Unknown option '%c' or argument missing", optopt);
1748 default:
1749 err("Unhandled option '%c'; please report this", i);
1750 }
1751 }
1752
1753 /* let the format option override all other options */
1754 if (out_format) {
1755 show_pax = show_phdr = show_textrel = show_rpath = \
1756 show_needed = show_interp = show_bind = show_soname = \
1757 show_textrels = 0;
1758 for (i = 0; out_format[i]; ++i) {
1759 if (!IS_MODIFIER(out_format[i])) continue;
1760
1761 switch (out_format[++i]) {
1762 case '+': break;
1763 case '%': break;
1764 case '#': break;
1765 case 'F': break;
1766 case 'p': break;
1767 case 'f': break;
1768 case 'k': break;
1769 case 's': break;
1770 case 'N': break;
1771 case 'o': break;
1772 case 'a': break;
1773 case 'x': show_pax = 1; break;
1774 case 'e': show_phdr = 1; break;
1775 case 't': show_textrel = 1; break;
1776 case 'r': show_rpath = 1; break;
1777 case 'n': show_needed = 1; break;
1778 case 'i': show_interp = 1; break;
1779 case 'b': show_bind = 1; break;
1780 case 'S': show_soname = 1; break;
1781 case 'T': show_textrels = 1; break;
1782 default:
1783 err("Invalid format specifier '%c' (byte %i)",
1784 out_format[i], i+1);
1785 }
1786 }
1787
1788 /* construct our default format */
1789 } else {
1790 size_t fmt_len = 30;
1791 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
1792 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1793 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1794 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1795 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1796 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1797 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1798 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1799 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1800 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1801 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1802 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1803 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1804 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1805 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1806 }
1807 if (be_verbose > 2) printf("Format: %s\n", out_format);
1808
1809 /* now lets actually do the scanning */
1810 if (scan_ldpath || use_ldcache)
1811 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
1812 if (scan_ldpath) scanelf_ldpath();
1813 if (scan_envpath) scanelf_envpath();
1814 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
1815 from_file = "-";
1816 if (from_file) {
1817 scanelf_from_file(from_file);
1818 from_file = *argv;
1819 }
1820 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1821 err("Nothing to scan !?");
1822 while (optind < argc) {
1823 search_path = argv[optind++];
1824 ret = scanelf_dir(search_path);
1825 }
1826
1827 /* clean up */
1828 free(versioned_symname);
1829 for (i = 0; ldpaths[i]; ++i)
1830 free(ldpaths[i]);
1831
1832 if (ldcache != 0)
1833 munmap(ldcache, ldcache_size);
1834 return ret;
1835 }
1836
1837 static char **get_split_env(const char *envvar)
1838 {
1839 const char *delims = " \t\n";
1840 char **envvals = NULL;
1841 char *env, *s;
1842 int nentry;
1843
1844 if ((env = getenv(envvar)) == NULL)
1845 return NULL;
1846
1847 env = xstrdup(env);
1848 if (env == NULL)
1849 return NULL;
1850
1851 s = strtok(env, delims);
1852 if (s == NULL) {
1853 free(env);
1854 return NULL;
1855 }
1856
1857 nentry = 0;
1858 while (s != NULL) {
1859 ++nentry;
1860 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
1861 envvals[nentry-1] = s;
1862 s = strtok(NULL, delims);
1863 }
1864 envvals[nentry] = NULL;
1865
1866 /* don't want to free(env) as it contains the memory that backs
1867 * the envvals array of strings */
1868 return envvals;
1869 }
1870 static void parseenv()
1871 {
1872 qa_textrels = get_split_env("QA_TEXTRELS");
1873 qa_execstack = get_split_env("QA_EXECSTACK");
1874 qa_wx_load = get_split_env("QA_WX_LOAD");
1875 }
1876
1877 #ifdef __PAX_UTILS_CLEANUP
1878 static void cleanup()
1879 {
1880 free(out_format);
1881 free(qa_textrels);
1882 free(qa_execstack);
1883 free(qa_wx_load);
1884 }
1885 #endif
1886
1887
1888 int main(int argc, char *argv[])
1889 {
1890 int ret;
1891 if (argc < 2)
1892 usage(EXIT_FAILURE);
1893 parseenv();
1894 ret = parseargs(argc, argv);
1895 fclose(stdout);
1896 #ifdef __PAX_UTILS_CLEANUP
1897 cleanup();
1898 warn("The calls to add/delete heap should be off:\n"
1899 "\t- 1 due to the out_buffer not being freed in scanelf_file()\n"
1900 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
1901 #endif
1902 return ret;
1903 }
1904
1905
1906
1907 /* utility funcs */
1908 static char *xstrdup(const char *s)
1909 {
1910 char *ret = strdup(s);
1911 if (!ret) err("Could not strdup(): %s", strerror(errno));
1912 return ret;
1913 }
1914 static void *xmalloc(size_t size)
1915 {
1916 void *ret = malloc(size);
1917 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1918 return ret;
1919 }
1920 static void *xrealloc(void *ptr, size_t size)
1921 {
1922 void *ret = realloc(ptr, size);
1923 if (!ret) err("Could not realloc() %li bytes", (unsigned long)size);
1924 return ret;
1925 }
1926 static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
1927 {
1928 size_t new_len;
1929
1930 new_len = strlen(*dst) + strlen(src);
1931 if (*curr_len <= new_len) {
1932 *curr_len = new_len + (*curr_len / 2);
1933 *dst = realloc(*dst, *curr_len);
1934 if (!*dst)
1935 err("could not realloc() %li bytes", (unsigned long)*curr_len);
1936 }
1937
1938 if (n)
1939 strncat(*dst, src, n);
1940 else
1941 strcat(*dst, src);
1942 }
1943 static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1944 {
1945 static char my_app[2];
1946 my_app[0] = append;
1947 my_app[1] = '\0';
1948 xstrcat(dst, my_app, curr_len);
1949 }
1950
1951 /* Match filename against entries in matchlist, return TRUE
1952 * if the file is listed */
1953 static int file_matches_list(const char *filename, char **matchlist)
1954 {
1955 char **file;
1956 char *match;
1957 char buf[__PAX_UTILS_PATH_MAX];
1958
1959 if (matchlist == NULL)
1960 return 0;
1961
1962 for (file = matchlist; *file != NULL; file++) {
1963 if (search_path) {
1964 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
1965 match = buf;
1966 } else {
1967 match = *file;
1968 }
1969 if (fnmatch(match, filename, 0) == 0)
1970 return 1;
1971 }
1972 return 0;
1973 }

  ViewVC Help
Powered by ViewVC 1.1.20