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

Contents of /pax-utils/scanelf.c

Parent Directory Parent Directory | Revision Log Revision Log


Revision 1.170 - (show annotations) (download) (as text)
Tue Jan 9 18:46:22 2007 UTC (7 years, 6 months ago) by solar
Branch: MAIN
Changes since 1.169: +32 -4 lines
File MIME type: text/x-csrc
- dont call objdump without first making sure it exists.

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 1.169 2007/01/09 00:23:13 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 1.169 2007/01/09 00:23:13 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 int has_objdump = 0;
79
80 static char *which(const char *fname)
81 {
82 static char fullpath[BUFSIZ];
83 char *path, *p;
84
85 memset(fullpath, 0x0, sizeof(fullpath));
86
87 path = getenv("PATH");
88
89 if (!path)
90 return NULL;
91
92 path = xstrdup(path);
93 while ((p = strrchr(path, ':')) != NULL) {
94 snprintf(fullpath, sizeof(fullpath), "%s/%s", p + 1, fname);
95 *p = 0;
96 if (access(fullpath, R_OK) != (-1)) {
97 free(path);
98 return (char *) fullpath;
99 }
100 }
101 free(path);
102 return NULL;
103 }
104
105 /* sub-funcs for scanelf_file() */
106 static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
107 {
108 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
109 #define GET_SYMTABS(B) \
110 if (elf->elf_class == ELFCLASS ## B) { \
111 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
112 /* debug sections */ \
113 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
114 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
115 /* runtime sections */ \
116 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
117 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
118 if (symtab && dynsym) { \
119 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \
120 } else { \
121 *sym = (void*)(symtab ? symtab : dynsym); \
122 } \
123 if (strtab && dynstr) { \
124 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \
125 } else { \
126 *tab = (void*)(strtab ? strtab : dynstr); \
127 } \
128 }
129 GET_SYMTABS(32)
130 GET_SYMTABS(64)
131 }
132
133 static char *scanelf_file_pax(elfobj *elf, char *found_pax)
134 {
135 static char ret[7];
136 unsigned long i, shown;
137
138 if (!show_pax) return NULL;
139
140 shown = 0;
141 memset(&ret, 0, sizeof(ret));
142
143 if (elf->phdr) {
144 #define SHOW_PAX(B) \
145 if (elf->elf_class == ELFCLASS ## B) { \
146 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
147 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
148 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
149 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
150 continue; \
151 if (fix_elf && setpax) { \
152 /* set the paxctl flags */ \
153 ESET(phdr[i].p_flags, setpax); \
154 } \
155 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
156 continue; \
157 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
158 *found_pax = 1; \
159 ++shown; \
160 break; \
161 } \
162 }
163 SHOW_PAX(32)
164 SHOW_PAX(64)
165 }
166
167
168 if (fix_elf && setpax) {
169 /* set the chpax settings */
170 if (elf->elf_class == ELFCLASS32) {
171 if (EHDR32(elf->ehdr)->e_type == ET_DYN || EHDR32(elf->ehdr)->e_type == ET_EXEC)
172 ESET(EHDR32(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
173 } else {
174 if (EHDR64(elf->ehdr)->e_type == ET_DYN || EHDR64(elf->ehdr)->e_type == ET_EXEC)
175 ESET(EHDR64(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
176 }
177 }
178
179 /* fall back to EI_PAX if no PT_PAX was found */
180 if (!*ret) {
181 static char *paxflags;
182 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
183 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
184 *found_pax = 1;
185 return (be_wewy_wewy_quiet ? NULL : paxflags);
186 }
187 strncpy(ret, paxflags, sizeof(ret));
188 }
189
190 if (be_wewy_wewy_quiet || (be_quiet && !shown))
191 return NULL;
192 else
193 return ret;
194 }
195
196 static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
197 {
198 static char ret[12];
199 char *found;
200 unsigned long i, shown, multi_stack, multi_relro, multi_load;
201 int max_pt_load;
202
203 if (!show_phdr) return NULL;
204
205 memcpy(ret, "--- --- ---\0", 12);
206
207 shown = 0;
208 multi_stack = multi_relro = multi_load = 0;
209 max_pt_load = elf_max_pt_load(elf);
210
211 #define NOTE_GNU_STACK ".note.GNU-stack"
212 #define SHOW_PHDR(B) \
213 if (elf->elf_class == ELFCLASS ## B) { \
214 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
215 Elf ## B ## _Off offset; \
216 uint32_t flags, check_flags; \
217 if (elf->phdr != NULL) { \
218 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
219 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
220 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
221 if (multi_stack++) \
222 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
223 if (file_matches_list(elf->filename, qa_execstack)) \
224 continue; \
225 found = found_phdr; \
226 offset = 0; \
227 check_flags = PF_X; \
228 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
229 if (multi_relro++) \
230 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
231 found = found_relro; \
232 offset = 4; \
233 check_flags = PF_X; \
234 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
235 if (ehdr->e_type == ET_DYN || ehdr->e_type == ET_EXEC) \
236 if (multi_load++ > max_pt_load) \
237 warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
238 if (file_matches_list(elf->filename, qa_wx_load)) \
239 continue; \
240 found = found_load; \
241 offset = 8; \
242 check_flags = PF_W|PF_X; \
243 } else \
244 continue; \
245 flags = EGET(phdr[i].p_flags); \
246 if (be_quiet && ((flags & check_flags) != check_flags)) \
247 continue; \
248 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
249 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
250 ret[3] = ret[7] = '!'; \
251 flags = EGET(phdr[i].p_flags); \
252 } \
253 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
254 *found = 1; \
255 ++shown; \
256 } \
257 } else if (elf->shdr != NULL) { \
258 /* no program headers which means this is prob an object file */ \
259 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
260 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
261 char *str; \
262 if ((void*)strtbl > (void*)elf->data_end) \
263 goto skip_this_shdr##B; \
264 check_flags = SHF_WRITE|SHF_EXECINSTR; \
265 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
266 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
267 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
268 str = elf->data + offset; \
269 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
270 if (!strcmp(str, NOTE_GNU_STACK)) { \
271 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
272 flags = EGET(shdr[i].sh_flags); \
273 if (be_quiet && ((flags & check_flags) != check_flags)) \
274 continue; \
275 ++*found_phdr; \
276 shown = 1; \
277 if (flags & SHF_WRITE) ret[0] = 'W'; \
278 if (flags & SHF_ALLOC) ret[1] = 'A'; \
279 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
280 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
281 break; \
282 } \
283 } \
284 skip_this_shdr##B: \
285 if (!multi_stack) { \
286 if (file_matches_list(elf->filename, qa_execstack)) \
287 return NULL; \
288 *found_phdr = 1; \
289 shown = 1; \
290 memcpy(ret, "!WX", 3); \
291 } \
292 } \
293 }
294 SHOW_PHDR(32)
295 SHOW_PHDR(64)
296
297 if (be_wewy_wewy_quiet || (be_quiet && !shown))
298 return NULL;
299 else
300 return ret;
301 }
302
303 static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
304 {
305 static const char *ret = "TEXTREL";
306 unsigned long i;
307
308 if (!show_textrel && !show_textrels) return NULL;
309
310 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
311
312 if (elf->phdr) {
313 #define SHOW_TEXTREL(B) \
314 if (elf->elf_class == ELFCLASS ## B) { \
315 Elf ## B ## _Dyn *dyn; \
316 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
317 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
318 Elf ## B ## _Off offset; \
319 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
320 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
321 offset = EGET(phdr[i].p_offset); \
322 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
323 dyn = DYN ## B (elf->data + offset); \
324 while (EGET(dyn->d_tag) != DT_NULL) { \
325 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
326 *found_textrel = 1; \
327 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
328 return (be_wewy_wewy_quiet ? NULL : ret); \
329 } \
330 ++dyn; \
331 } \
332 } }
333 SHOW_TEXTREL(32)
334 SHOW_TEXTREL(64)
335 }
336
337 if (be_quiet || be_wewy_wewy_quiet)
338 return NULL;
339 else
340 return " - ";
341 }
342 static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
343 {
344 unsigned long s, r, rmax;
345 void *symtab_void, *strtab_void, *text_void;
346
347 if (!show_textrels) return NULL;
348
349 /* don't search for TEXTREL's if the ELF doesn't have any */
350 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
351 if (!*found_textrel) return NULL;
352
353 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
354 text_void = elf_findsecbyname(elf, ".text");
355
356 if (symtab_void && strtab_void && text_void && elf->shdr) {
357 #define SHOW_TEXTRELS(B) \
358 if (elf->elf_class == ELFCLASS ## B) { \
359 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
360 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
361 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
362 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
363 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
364 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
365 uint ## B ## _t memsz = EGET(text->sh_size); \
366 Elf ## B ## _Rel *rel; \
367 Elf ## B ## _Rela *rela; \
368 /* search the section headers for relocations */ \
369 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
370 uint32_t sh_type = EGET(shdr[s].sh_type); \
371 if (sh_type == SHT_REL) { \
372 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \
373 rela = NULL; \
374 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
375 } else if (sh_type == SHT_RELA) { \
376 rel = NULL; \
377 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \
378 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
379 } else \
380 continue; \
381 /* now see if any of the relocs are in the .text */ \
382 for (r = 0; r < rmax; ++r) { \
383 unsigned long sym_max; \
384 Elf ## B ## _Addr offset_tmp; \
385 Elf ## B ## _Sym *func; \
386 Elf ## B ## _Sym *sym; \
387 Elf ## B ## _Addr r_offset; \
388 uint ## B ## _t r_info; \
389 if (sh_type == SHT_REL) { \
390 r_offset = EGET(rel[r].r_offset); \
391 r_info = EGET(rel[r].r_info); \
392 } else { \
393 r_offset = EGET(rela[r].r_offset); \
394 r_info = EGET(rela[r].r_info); \
395 } \
396 /* make sure this relocation is inside of the .text */ \
397 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
398 if (be_verbose <= 2) continue; \
399 } else \
400 *found_textrels = 1; \
401 /* locate this relocation symbol name */ \
402 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
403 if ((void*)sym > (void*)elf->data_end) { \
404 warn("%s: corrupt ELF symbol", elf->filename); \
405 continue; \
406 } \
407 sym_max = ELF ## B ## _R_SYM(r_info); \
408 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
409 sym += sym_max; \
410 else \
411 sym = NULL; \
412 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
413 /* show the raw details about this reloc */ \
414 printf(" %s: ", elf->base_filename); \
415 if (sym && sym->st_name) \
416 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \
417 else \
418 printf("(memory/data?)"); \
419 printf(" [0x%lX]", (unsigned long)r_offset); \
420 /* now try to find the closest symbol that this rel is probably in */ \
421 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
422 func = NULL; \
423 offset_tmp = 0; \
424 while (sym_max--) { \
425 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
426 func = sym; \
427 offset_tmp = EGET(sym->st_value); \
428 } \
429 ++sym; \
430 } \
431 printf(" in "); \
432 if (func && func->st_name) { \
433 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
434 if (r_offset > EGET(func->st_size)) \
435 printf("(optimized out: previous %s)", func_name); \
436 else \
437 printf("%s", func_name); \
438 } else \
439 printf("(optimized out)"); \
440 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
441 if (be_verbose && has_objdump) { \
442 char *sysbuf; \
443 size_t syslen; \
444 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"; \
445 syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
446 sysbuf = xmalloc(syslen); \
447 if (sysbuf) { \
448 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
449 if (end_addr < r_offset) \
450 /* not uncommon when things are optimized out */ \
451 end_addr = r_offset + 0x100; \
452 snprintf(sysbuf, syslen, sysfmt, \
453 (unsigned long)offset_tmp, \
454 (unsigned long)end_addr, \
455 elf->filename, \
456 (unsigned long)r_offset); \
457 fflush(stdout); \
458 system(sysbuf); \
459 fflush(stdout); \
460 free(sysbuf); \
461 } \
462 } \
463 } \
464 } }
465 SHOW_TEXTRELS(32)
466 SHOW_TEXTRELS(64)
467 }
468 if (!*found_textrels)
469 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
470
471 return NULL;
472 }
473
474 static void rpath_security_checks(elfobj *, char *, const char *);
475 static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
476 {
477 struct stat st;
478 switch (*item) {
479 case '/': break;
480 case '.':
481 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
482 break;
483 case ':':
484 case '\0':
485 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
486 break;
487 case '$':
488 if (fstat(elf->fd, &st) != -1)
489 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
490 warnf("Security problem with %s='%s' in %s with mode set of %o",
491 dt_type, item, elf->filename, st.st_mode & 07777);
492 break;
493 default:
494 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
495 break;
496 }
497 }
498 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
499 {
500 unsigned long i, s;
501 char *rpath, *runpath, **r;
502 void *strtbl_void;
503
504 if (!show_rpath) return;
505
506 strtbl_void = elf_findsecbyname(elf, ".dynstr");
507 rpath = runpath = NULL;
508
509 if (elf->phdr && strtbl_void) {
510 #define SHOW_RPATH(B) \
511 if (elf->elf_class == ELFCLASS ## B) { \
512 Elf ## B ## _Dyn *dyn; \
513 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
514 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
515 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
516 Elf ## B ## _Off offset; \
517 Elf ## B ## _Xword word; \
518 /* Scan all the program headers */ \
519 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
520 /* Just scan dynamic headers */ \
521 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
522 offset = EGET(phdr[i].p_offset); \
523 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
524 /* Just scan dynamic RPATH/RUNPATH headers */ \
525 dyn = DYN ## B (elf->data + offset); \
526 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
527 if (word == DT_RPATH) { \
528 r = &rpath; \
529 } else if (word == DT_RUNPATH) { \
530 r = &runpath; \
531 } else { \
532 ++dyn; \
533 continue; \
534 } \
535 /* Verify the memory is somewhat sane */ \
536 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
537 if (offset < (Elf ## B ## _Off)elf->len) { \
538 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
539 *r = (char*)(elf->data + offset); \
540 /* cache the length in case we need to nuke this section later on */ \
541 if (fix_elf) \
542 offset = strlen(*r); \
543 /* If quiet, don't output paths in ld.so.conf */ \
544 if (be_quiet) { \
545 size_t len; \
546 char *start, *end; \
547 /* note that we only 'chop' off leading known paths. */ \
548 /* since *r is read-only memory, we can only move the ptr forward. */ \
549 start = *r; \
550 /* scan each path in : delimited list */ \
551 while (start) { \
552 rpath_security_checks(elf, start, get_elfdtype(word)); \
553 end = strchr(start, ':'); \
554 len = (end ? abs(end - start) : strlen(start)); \
555 if (use_ldcache) \
556 for (s = 0; ldpaths[s]; ++s) \
557 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
558 *r = end; \
559 /* corner case ... if RPATH reads "/usr/lib:", we want \
560 * to show ':' rather than '' */ \
561 if (end && end[1] != '\0') \
562 (*r)++; \
563 break; \
564 } \
565 if (!*r || !end) \
566 break; \
567 else \
568 start = start + len + 1; \
569 } \
570 } \
571 if (*r) { \
572 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
573 /* just nuke it */ \
574 nuke_it##B: \
575 memset(*r, 0x00, offset); \
576 *r = NULL; \
577 ESET(dyn->d_tag, DT_DEBUG); \
578 ESET(dyn->d_un.d_ptr, 0); \
579 } else if (fix_elf) { \
580 /* try to clean "bad" paths */ \
581 size_t len, tmpdir_len; \
582 char *start, *end; \
583 const char *tmpdir; \
584 start = *r; \
585 tmpdir = (getenv("TMPDIR") ? : "."); \
586 tmpdir_len = strlen(tmpdir); \
587 while (1) { \
588 end = strchr(start, ':'); \
589 if (start == end) { \
590 eat_this_path##B: \
591 len = strlen(end); \
592 memmove(start, end+1, len); \
593 start[len-1] = '\0'; \
594 end = start - 1; \
595 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
596 if (!end) { \
597 if (start == *r) \
598 goto nuke_it##B; \
599 *--start = '\0'; \
600 } else \
601 goto eat_this_path##B; \
602 } \
603 if (!end) \
604 break; \
605 start = end + 1; \
606 } \
607 if (**r == '\0') \
608 goto nuke_it##B; \
609 } \
610 if (*r) \
611 *found_rpath = 1; \
612 } \
613 } \
614 ++dyn; \
615 } \
616 } }
617 SHOW_RPATH(32)
618 SHOW_RPATH(64)
619 }
620
621 if (be_wewy_wewy_quiet) return;
622
623 if (rpath && runpath) {
624 if (!strcmp(rpath, runpath)) {
625 xstrcat(ret, runpath, ret_len);
626 } else {
627 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
628 xchrcat(ret, '{', ret_len);
629 xstrcat(ret, rpath, ret_len);
630 xchrcat(ret, ',', ret_len);
631 xstrcat(ret, runpath, ret_len);
632 xchrcat(ret, '}', ret_len);
633 }
634 } else if (rpath || runpath)
635 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
636 else if (!be_quiet)
637 xstrcat(ret, " - ", ret_len);
638 }
639
640 #define LDSO_CACHE_MAGIC "ld.so-"
641 #define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
642 #define LDSO_CACHE_VER "1.7.0"
643 #define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
644 #define FLAG_ANY -1
645 #define FLAG_TYPE_MASK 0x00ff
646 #define FLAG_LIBC4 0x0000
647 #define FLAG_ELF 0x0001
648 #define FLAG_ELF_LIBC5 0x0002
649 #define FLAG_ELF_LIBC6 0x0003
650 #define FLAG_REQUIRED_MASK 0xff00
651 #define FLAG_SPARC_LIB64 0x0100
652 #define FLAG_IA64_LIB64 0x0200
653 #define FLAG_X8664_LIB64 0x0300
654 #define FLAG_S390_LIB64 0x0400
655 #define FLAG_POWERPC_LIB64 0x0500
656 #define FLAG_MIPS64_LIBN32 0x0600
657 #define FLAG_MIPS64_LIBN64 0x0700
658
659 static char *lookup_cache_lib(elfobj *, char *);
660
661 #if defined(__GLIBC__) || defined(__UCLIBC__)
662
663 static char *lookup_cache_lib(elfobj *elf, char *fname)
664 {
665 int fd = 0;
666 char *strs;
667 static char buf[__PAX_UTILS_PATH_MAX] = "";
668 const char *cachefile = "/etc/ld.so.cache";
669 struct stat st;
670
671 typedef struct {
672 char magic[LDSO_CACHE_MAGIC_LEN];
673 char version[LDSO_CACHE_VER_LEN];
674 int nlibs;
675 } header_t;
676 header_t *header;
677
678 typedef struct {
679 int flags;
680 int sooffset;
681 int liboffset;
682 } libentry_t;
683 libentry_t *libent;
684
685 if (fname == NULL)
686 return NULL;
687
688 if (ldcache == 0) {
689 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1)
690 return NULL;
691
692 /* cache these values so we only map/unmap the cache file once */
693 ldcache_size = st.st_size;
694 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
695
696 close(fd);
697
698 if (ldcache == (caddr_t)-1) {
699 ldcache = 0;
700 return NULL;
701 }
702
703 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
704 return NULL;
705 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
706 return NULL;
707 }
708
709 header = (header_t *) ldcache;
710 libent = (libentry_t *) (ldcache + sizeof(header_t));
711 strs = (char *) &libent[header->nlibs];
712
713 for (fd = 0; fd < header->nlibs; fd++) {
714 /* this should be more fine grained, but for now we assume that
715 * diff arches will not be cached together. and we ignore the
716 * the different multilib mips cases. */
717 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
718 continue;
719 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
720 continue;
721
722 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
723 continue;
724 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
725 }
726 return buf;
727 }
728 #elif defined(__NetBSD__)
729 static char *lookup_cache_lib(elfobj *elf, char *fname)
730 {
731 static char buf[__PAX_UTILS_PATH_MAX] = "";
732 static struct stat st;
733
734 char **ldpath;
735 for (ldpath = ldpaths; *ldpath != NULL; ldpath++) {
736 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", *ldpath, fname) >= sizeof(buf))
737 continue; /* if the pathname is too long, or something went wrong, ignore */
738
739 if (stat(buf, &st) != 0)
740 continue; /* if the lib doesn't exist in *ldpath, look further */
741
742 /* NetBSD doesn't actually do sanity checks, it just loads the file
743 * and if that doesn't work, continues looking in other directories.
744 * This cannot easily be safely emulated, unfortunately. For now,
745 * just assume that if it exists, it's a valid library. */
746
747 return buf;
748 }
749
750 /* not found in any path */
751 return NULL;
752 }
753 #else
754 #warning Cache support not implemented for your target
755 static char *lookup_cache_lib(elfobj *elf, char *fname)
756 {
757 return NULL;
758 }
759 #endif
760
761 static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
762 {
763 unsigned long i;
764 char *needed;
765 void *strtbl_void;
766 char *p;
767
768 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
769
770 strtbl_void = elf_findsecbyname(elf, ".dynstr");
771
772 if (elf->phdr && strtbl_void) {
773 #define SHOW_NEEDED(B) \
774 if (elf->elf_class == ELFCLASS ## B) { \
775 Elf ## B ## _Dyn *dyn; \
776 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
777 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
778 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
779 Elf ## B ## _Off offset; \
780 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
781 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
782 offset = EGET(phdr[i].p_offset); \
783 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
784 dyn = DYN ## B (elf->data + offset); \
785 while (EGET(dyn->d_tag) != DT_NULL) { \
786 if (EGET(dyn->d_tag) == DT_NEEDED) { \
787 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
788 if (offset >= (Elf ## B ## _Off)elf->len) { \
789 ++dyn; \
790 continue; \
791 } \
792 needed = (char*)(elf->data + offset); \
793 if (op == 0) { \
794 if (!be_wewy_wewy_quiet) { \
795 if (*found_needed) xchrcat(ret, ',', ret_len); \
796 if (use_ldcache) \
797 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
798 needed = p; \
799 xstrcat(ret, needed, ret_len); \
800 } \
801 *found_needed = 1; \
802 } else { \
803 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \
804 *found_lib = 1; \
805 return (be_wewy_wewy_quiet ? NULL : needed); \
806 } \
807 } \
808 } \
809 ++dyn; \
810 } \
811 } }
812 SHOW_NEEDED(32)
813 SHOW_NEEDED(64)
814 if (op == 0 && !*found_needed && be_verbose)
815 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
816 }
817
818 return NULL;
819 }
820 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
821 {
822 void *strtbl_void;
823
824 if (!show_interp) return NULL;
825
826 strtbl_void = elf_findsecbyname(elf, ".interp");
827
828 if (strtbl_void) {
829 #define SHOW_INTERP(B) \
830 if (elf->elf_class == ELFCLASS ## B) { \
831 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
832 *found_interp = 1; \
833 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
834 }
835 SHOW_INTERP(32)
836 SHOW_INTERP(64)
837 }
838 return NULL;
839 }
840 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
841 {
842 unsigned long i;
843 struct stat s;
844 char dynamic = 0;
845
846 if (!show_bind) return NULL;
847 if (!elf->phdr) return NULL;
848
849 #define SHOW_BIND(B) \
850 if (elf->elf_class == ELFCLASS ## B) { \
851 Elf ## B ## _Dyn *dyn; \
852 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
853 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
854 Elf ## B ## _Off offset; \
855 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
856 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
857 dynamic = 1; \
858 offset = EGET(phdr[i].p_offset); \
859 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
860 dyn = DYN ## B (elf->data + offset); \
861 while (EGET(dyn->d_tag) != DT_NULL) { \
862 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
863 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
864 { \
865 if (be_quiet) return NULL; \
866 *found_bind = 1; \
867 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
868 } \
869 ++dyn; \
870 } \
871 } \
872 }
873 SHOW_BIND(32)
874 SHOW_BIND(64)
875
876 if (be_wewy_wewy_quiet) return NULL;
877
878 /* don't output anything if quiet mode and the ELF is static or not setuid */
879 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
880 return NULL;
881 } else {
882 *found_bind = 1;
883 return (char *) (dynamic ? "LAZY" : "STATIC");
884 }
885 }
886 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
887 {
888 unsigned long i;
889 char *soname;
890 void *strtbl_void;
891
892 if (!show_soname) return NULL;
893
894 strtbl_void = elf_findsecbyname(elf, ".dynstr");
895
896 if (elf->phdr && strtbl_void) {
897 #define SHOW_SONAME(B) \
898 if (elf->elf_class == ELFCLASS ## B) { \
899 Elf ## B ## _Dyn *dyn; \
900 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
901 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
902 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
903 Elf ## B ## _Off offset; \
904 /* only look for soname in shared objects */ \
905 if (ehdr->e_type != ET_DYN) \
906 return NULL; \
907 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
908 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
909 offset = EGET(phdr[i].p_offset); \
910 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
911 dyn = DYN ## B (elf->data + offset); \
912 while (EGET(dyn->d_tag) != DT_NULL) { \
913 if (EGET(dyn->d_tag) == DT_SONAME) { \
914 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
915 if (offset >= (Elf ## B ## _Off)elf->len) { \
916 ++dyn; \
917 continue; \
918 } \
919 soname = (char*)(elf->data + offset); \
920 *found_soname = 1; \
921 return (be_wewy_wewy_quiet ? NULL : soname); \
922 } \
923 ++dyn; \
924 } \
925 } }
926 SHOW_SONAME(32)
927 SHOW_SONAME(64)
928 }
929
930 return NULL;
931 }
932 static char *scanelf_file_sym(elfobj *elf, char *found_sym)
933 {
934 unsigned long i;
935 char *ret;
936 void *symtab_void, *strtab_void;
937
938 if (!find_sym) return NULL;
939 ret = find_sym;
940
941 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
942
943 if (symtab_void && strtab_void) {
944 #define FIND_SYM(B) \
945 if (elf->elf_class == ELFCLASS ## B) { \
946 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
947 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
948 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
949 unsigned long cnt = EGET(symtab->sh_entsize); \
950 char *symname; \
951 if (cnt) \
952 cnt = EGET(symtab->sh_size) / cnt; \
953 for (i = 0; i < cnt; ++i) { \
954 if (sym->st_name) { \
955 /* make sure the symbol name is in acceptable memory range */ \
956 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
957 if ((void*)symname > (void*)elf->data_end) { \
958 warnf("%s: corrupt ELF symbols", elf->filename); \
959 ++sym; \
960 continue; \
961 } \
962 /* debug display ... show all symbols and some extra info */ \
963 if (*ret == '*') { \
964 printf("%s(%s) %5lX %15s %s\n", \
965 ((*found_sym == 0) ? "\n\t" : "\t"), \
966 elf->base_filename, \
967 (unsigned long)sym->st_size, \
968 get_elfstttype(sym->st_info), \
969 symname); \
970 *found_sym = 1; \
971 } else { \
972 /* allow the user to specify a comma delimited list of symbols to search for */ \
973 char *this_sym, *this_sym_ver, *next_sym; \
974 this_sym = ret; \
975 this_sym_ver = versioned_symname; \
976 do { \
977 next_sym = strchr(this_sym, ','); \
978 if (next_sym == NULL) \
979 next_sym = this_sym + strlen(this_sym); \
980 /* do we want a defined symbol ? */ \
981 if (*this_sym == '+') { \
982 if (sym->st_shndx == SHN_UNDEF) \
983 goto skip_this_sym##B; \
984 ++this_sym; \
985 ++this_sym_ver; \
986 /* do we want an undefined symbol ? */ \
987 } else if (*this_sym == '-') { \
988 if (sym->st_shndx != SHN_UNDEF) \
989 goto skip_this_sym##B; \
990 ++this_sym; \
991 ++this_sym_ver; \
992 } \
993 /* ok, lets compare the name now */ \
994 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
995 (strncmp(this_sym_ver, symname, strlen(this_sym_ver)) == 0)) { \
996 if (be_semi_verbose) { \
997 char buf[126]; \
998 snprintf(buf, sizeof(buf), "%lX %s %s", \
999 (unsigned long)sym->st_size, get_elfstttype(sym->st_info), this_sym); \
1000 ret = buf; \
1001 } else \
1002 ret = this_sym; \
1003 (*found_sym)++; \
1004 goto break_out; \
1005 } \
1006 skip_this_sym##B: this_sym = next_sym + 1; \
1007 } while (*next_sym != '\0'); \
1008 } \
1009 } \
1010 ++sym; \
1011 } }
1012 FIND_SYM(32)
1013 FIND_SYM(64)
1014 }
1015
1016 break_out:
1017 if (be_wewy_wewy_quiet) return NULL;
1018
1019 if (*find_sym != '*' && *found_sym)
1020 return ret;
1021 if (be_quiet)
1022 return NULL;
1023 else
1024 return (char *)" - ";
1025 }
1026
1027
1028 static char *scanelf_file_sections(elfobj *elf, char *found_section)
1029 {
1030 if (!find_section)
1031 return NULL;
1032
1033 #define FIND_SECTION(B) \
1034 if (elf->elf_class == ELFCLASS ## B) { \
1035 int invert; \
1036 Elf ## B ## _Shdr *section; \
1037 invert = (*find_section == '!' ? 1 : 0); \
1038 section = SHDR ## B (elf_findsecbyname(elf, find_section+invert)); \
1039 if ((section == NULL && invert) || (section != NULL && !invert)) \
1040 *found_section = 1; \
1041 }
1042 FIND_SECTION(32)
1043 FIND_SECTION(64)
1044
1045 if (be_wewy_wewy_quiet)
1046 return NULL;
1047
1048 if (*found_section)
1049 return find_section;
1050
1051 if (be_quiet)
1052 return NULL;
1053 else
1054 return (char *)" - ";
1055 }
1056
1057 /* scan an elf file and show all the fun stuff */
1058 #define prints(str) write(fileno(stdout), str, strlen(str))
1059 static int scanelf_elfobj(elfobj *elf)
1060 {
1061 unsigned long i;
1062 char found_pax, found_phdr, found_relro, found_load, found_textrel,
1063 found_rpath, found_needed, found_interp, found_bind, found_soname,
1064 found_sym, found_lib, found_file, found_textrels, found_section;
1065 static char *out_buffer = NULL;
1066 static size_t out_len;
1067
1068 found_pax = found_phdr = found_relro = found_load = found_textrel = \
1069 found_rpath = found_needed = found_interp = found_bind = found_soname = \
1070 found_sym = found_lib = found_file = found_textrels = found_section = 0;
1071
1072 if (be_verbose > 2)
1073 printf("%s: scanning file {%s,%s}\n", elf->filename,
1074 get_elfeitype(EI_CLASS, elf->elf_class),
1075 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
1076 else if (be_verbose > 1)
1077 printf("%s: scanning file\n", elf->filename);
1078
1079 /* init output buffer */
1080 if (!out_buffer) {
1081 out_len = sizeof(char) * 80;
1082 out_buffer = (char*)xmalloc(out_len);
1083 }
1084 *out_buffer = '\0';
1085
1086 /* show the header */
1087 if (!be_quiet && show_banner) {
1088 for (i = 0; out_format[i]; ++i) {
1089 if (!IS_MODIFIER(out_format[i])) continue;
1090
1091 switch (out_format[++i]) {
1092 case '+': break;
1093 case '%': break;
1094 case '#': break;
1095 case 'F':
1096 case 'p':
1097 case 'f': prints("FILE "); found_file = 1; break;
1098 case 'o': prints(" TYPE "); break;
1099 case 'x': prints(" PAX "); break;
1100 case 'e': prints("STK/REL/PTL "); break;
1101 case 't': prints("TEXTREL "); break;
1102 case 'r': prints("RPATH "); break;
1103 case 'n': prints("NEEDED "); break;
1104 case 'i': prints("INTERP "); break;
1105 case 'b': prints("BIND "); break;
1106 case 'S': prints("SONAME "); break;
1107 case 's': prints("SYM "); break;
1108 case 'N': prints("LIB "); break;
1109 case 'T': prints("TEXTRELS "); break;
1110 case 'k': prints("SECTION "); break;
1111 case 'a': prints("ARCH "); break;
1112 default: warnf("'%c' has no title ?", out_format[i]);
1113 }
1114 }
1115 if (!found_file) prints("FILE ");
1116 prints("\n");
1117 found_file = 0;
1118 show_banner = 0;
1119 }
1120
1121 /* dump all the good stuff */
1122 for (i = 0; out_format[i]; ++i) {
1123 const char *out;
1124 const char *tmp;
1125
1126 if (!IS_MODIFIER(out_format[i])) {
1127 xchrcat(&out_buffer, out_format[i], &out_len);
1128 continue;
1129 }
1130
1131 out = NULL;
1132 be_wewy_wewy_quiet = (out_format[i] == '#');
1133 be_semi_verbose = (out_format[i] == '+');
1134 switch (out_format[++i]) {
1135 case '+':
1136 case '%':
1137 case '#':
1138 xchrcat(&out_buffer, out_format[i], &out_len); break;
1139 case 'F':
1140 found_file = 1;
1141 if (be_wewy_wewy_quiet) break;
1142 xstrcat(&out_buffer, elf->filename, &out_len);
1143 break;
1144 case 'p':
1145 found_file = 1;
1146 if (be_wewy_wewy_quiet) break;
1147 tmp = elf->filename;
1148 if (search_path) {
1149 ssize_t len_search = strlen(search_path);
1150 ssize_t len_file = strlen(elf->filename);
1151 if (!strncmp(elf->filename, search_path, len_search) && \
1152 len_file > len_search)
1153 tmp += len_search;
1154 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1155 }
1156 xstrcat(&out_buffer, tmp, &out_len);
1157 break;
1158 case 'f':
1159 found_file = 1;
1160 if (be_wewy_wewy_quiet) break;
1161 tmp = strrchr(elf->filename, '/');
1162 tmp = (tmp == NULL ? elf->filename : tmp+1);
1163 xstrcat(&out_buffer, tmp, &out_len);
1164 break;
1165 case 'o': out = get_elfetype(elf); break;
1166 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
1167 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
1168 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1169 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
1170 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1171 case 'n':
1172 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
1173 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1174 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1175 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
1176 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1177 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1178 case 'a': out = get_elfemtype(elf); break;
1179 default: warnf("'%c' has no scan code?", out_format[i]);
1180 }
1181 if (out) {
1182 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
1183 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
1184 xstrncat(&out_buffer, out, &out_len, (tmp-out));
1185 else
1186 xstrcat(&out_buffer, out, &out_len);
1187 }
1188 }
1189
1190 #define FOUND_SOMETHING() \
1191 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1192 found_rpath || found_needed || found_interp || found_bind || \
1193 found_soname || found_sym || found_lib || found_textrels || found_section )
1194
1195 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1196 xchrcat(&out_buffer, ' ', &out_len);
1197 xstrcat(&out_buffer, elf->filename, &out_len);
1198 }
1199 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
1200 puts(out_buffer);
1201 fflush(stdout);
1202 }
1203
1204 return 0;
1205 }
1206
1207 /* scan a single elf */
1208 static int scanelf_elf(const char *filename, int fd, size_t len)
1209 {
1210 int ret = 1;
1211 elfobj *elf;
1212
1213 /* verify this is real ELF */
1214 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1215 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1216 return ret;
1217 }
1218 switch (match_bits) {
1219 case 32:
1220 if (elf->elf_class != ELFCLASS32)
1221 goto label_done;
1222 break;
1223 case 64:
1224 if (elf->elf_class != ELFCLASS64)
1225 goto label_done;
1226 break;
1227 default: break;
1228 }
1229 if (strlen(match_etypes)) {
1230 char sbuf[126];
1231 strncpy(sbuf, match_etypes, sizeof(sbuf));
1232 if (strchr(match_etypes, ',') != NULL) {
1233 char *p;
1234 while((p = strrchr(sbuf, ',')) != NULL) {
1235 *p = 0;
1236 if (etype_lookup(p+1) == get_etype(elf))
1237 goto label_ret;
1238 }
1239 }
1240 if (etype_lookup(sbuf) != get_etype(elf))
1241 goto label_done;
1242 }
1243
1244 label_ret:
1245 ret = scanelf_elfobj(elf);
1246
1247 label_done:
1248 unreadelf(elf);
1249 return ret;
1250 }
1251
1252 /* scan an archive of elfs */
1253 static int scanelf_archive(const char *filename, int fd, size_t len)
1254 {
1255 archive_handle *ar;
1256 archive_member *m;
1257 char *ar_buffer;
1258 elfobj *elf;
1259
1260 ar = ar_open_fd(filename, fd);
1261 if (ar == NULL)
1262 return 1;
1263
1264 ar_buffer = (char*)mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1265 while ((m=ar_next(ar)) != NULL) {
1266 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size);
1267 if (elf) {
1268 scanelf_elfobj(elf);
1269 unreadelf(elf);
1270 }
1271 }
1272 munmap(ar_buffer, len);
1273
1274 return 0;
1275 }
1276 /* scan a file which may be an elf or an archive or some other magical beast */
1277 static int scanelf_file(const char *filename, const struct stat *st_cache)
1278 {
1279 const struct stat *st = st_cache;
1280 struct stat symlink_st;
1281 int fd;
1282
1283 /* always handle regular files and handle symlinked files if no -y */
1284 if (S_ISLNK(st->st_mode)) {
1285 if (!scan_symlink) return 1;
1286 stat(filename, &symlink_st);
1287 st = &symlink_st;
1288 }
1289
1290 if (!S_ISREG(st->st_mode)) {
1291 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1292 return 1;
1293 }
1294
1295 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1296 return 1;
1297
1298 if (scanelf_elf(filename, fd, st->st_size) == 1 && scan_archives)
1299 /* if it isn't an ELF, maybe it's an .a archive */
1300 scanelf_archive(filename, fd, st->st_size);
1301
1302 close(fd);
1303 return 0;
1304 }
1305
1306 /* scan a directory for ET_EXEC files and print when we find one */
1307 static int scanelf_dir(const char *path)
1308 {
1309 register DIR *dir;
1310 register struct dirent *dentry;
1311 struct stat st_top, st;
1312 char buf[__PAX_UTILS_PATH_MAX];
1313 size_t pathlen = 0, len = 0;
1314 int ret = 0;
1315
1316 /* make sure path exists */
1317 if (lstat(path, &st_top) == -1) {
1318 if (be_verbose > 2) printf("%s: does not exist\n", path);
1319 return 1;
1320 }
1321
1322 /* ok, if it isn't a directory, assume we can open it */
1323 if (!S_ISDIR(st_top.st_mode)) {
1324 return scanelf_file(path, &st_top);
1325 }
1326
1327 /* now scan the dir looking for fun stuff */
1328 if ((dir = opendir(path)) == NULL) {
1329 warnf("could not opendir %s: %s", path, strerror(errno));
1330 return 1;
1331 }
1332 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1333
1334 pathlen = strlen(path);
1335 while ((dentry = readdir(dir))) {
1336 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1337 continue;
1338 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
1339 if (len >= sizeof(buf)) {
1340 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1341 (unsigned long)len, (unsigned long)sizeof(buf));
1342 continue;
1343 }
1344 snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name);
1345 if (lstat(buf, &st) != -1) {
1346 if (S_ISREG(st.st_mode))
1347 ret = scanelf_file(buf, &st);
1348 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1349 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1350 ret = scanelf_dir(buf);
1351 }
1352 }
1353 }
1354 closedir(dir);
1355 return ret;
1356 }
1357
1358 static int scanelf_from_file(const char *filename)
1359 {
1360 FILE *fp = NULL;
1361 char *p;
1362 char path[__PAX_UTILS_PATH_MAX];
1363 int ret = 0;
1364
1365 if (strcmp(filename, "-") == 0)
1366 fp = stdin;
1367 else if ((fp = fopen(filename, "r")) == NULL)
1368 return 1;
1369
1370 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1371 if ((p = strchr(path, '\n')) != NULL)
1372 *p = 0;
1373 search_path = path;
1374 ret = scanelf_dir(path);
1375 }
1376 if (fp != stdin)
1377 fclose(fp);
1378 return ret;
1379 }
1380
1381 #if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1382
1383 static int load_ld_cache_config(int i, const char *fname)
1384 {
1385 FILE *fp = NULL;
1386 char *p;
1387 char path[__PAX_UTILS_PATH_MAX];
1388
1389 if (i + 1 == ARRAY_SIZE(ldpaths))
1390 return i;
1391
1392 if ((fp = fopen(fname, "r")) == NULL)
1393 return i;
1394
1395 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1396 if ((p = strrchr(path, '\r')) != NULL)
1397 *p = 0;
1398 if ((p = strchr(path, '\n')) != NULL)
1399 *p = 0;
1400 #ifdef __linux__
1401 // recursive includes of the same file will make this segfault.
1402 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1403 glob64_t gl;
1404 size_t x;
1405 char gpath[__PAX_UTILS_PATH_MAX];
1406
1407 memset(gpath, 0, sizeof(gpath));
1408
1409 if (path[8] != '/')
1410 snprintf(gpath, sizeof(gpath), "/etc/%s", &path[8]);
1411 else
1412 strncpy(gpath, &path[8], sizeof(gpath));
1413
1414 if ((glob64(gpath, 0, NULL, &gl)) == 0) {
1415 for (x = 0; x < gl.gl_pathc; ++x) {
1416 /* try to avoid direct loops */
1417 if (strcmp(gl.gl_pathv[x], fname) == 0)
1418 continue;
1419 i = load_ld_cache_config(i, gl.gl_pathv[x]);
1420 if (i + 1 >= ARRAY_SIZE(ldpaths)) {
1421 globfree64(&gl);
1422 return i;
1423 }
1424 }
1425 globfree64 (&gl);
1426 continue;
1427 }
1428 }
1429 #endif
1430 if (*path != '/')
1431 continue;
1432
1433 ldpaths[i++] = xstrdup(path);
1434
1435 if (i + 1 == ARRAY_SIZE(ldpaths))
1436 break;
1437 }
1438 ldpaths[i] = NULL;
1439
1440 fclose(fp);
1441 return i;
1442 }
1443
1444 #elif defined(__FreeBSD__) || (__DragonFly__)
1445
1446 static int load_ld_cache_config(int i, const char *fname)
1447 {
1448 FILE *fp = NULL;
1449 char *b = NULL, *p;
1450 struct elfhints_hdr hdr;
1451
1452 if (i + 1 == ARRAY_SIZE(ldpaths))
1453 return i;
1454
1455 if ((fp = fopen(fname, "r")) == NULL)
1456 return i;
1457
1458 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1459 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1460 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1461 {
1462 fclose(fp);
1463 return i;
1464 }
1465
1466 b = (char*)malloc(hdr.dirlistlen+1);
1467 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1468 fclose(fp);
1469 free(b);
1470 return i;
1471 }
1472
1473 while ((p = strsep(&b, ":"))) {
1474 if (*p == '\0') continue;
1475 ldpaths[i++] = xstrdup(p);
1476
1477 if (i + 1 == ARRAY_SIZE(ldpaths))
1478 break;
1479 }
1480 ldpaths[i] = NULL;
1481
1482 free(b);
1483 fclose(fp);
1484 return i;
1485 }
1486
1487 #else
1488
1489 #warning Cache config support not implemented for your target
1490 static int load_ld_cache_config(int i, const char *fname)
1491 {
1492 memset(ldpaths, 0x00, sizeof(ldpaths));
1493 }
1494
1495 #endif
1496
1497 /* scan /etc/ld.so.conf for paths */
1498 static void scanelf_ldpath()
1499 {
1500 char scan_l, scan_ul, scan_ull;
1501 int i = 0;
1502
1503 if (!ldpaths[0])
1504 err("Unable to load any paths from ld.so.conf");
1505
1506 scan_l = scan_ul = scan_ull = 0;
1507
1508 while (ldpaths[i]) {
1509 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
1510 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
1511 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
1512 scanelf_dir(ldpaths[i]);
1513 ++i;
1514 }
1515
1516 if (!scan_l) scanelf_dir("/lib");
1517 if (!scan_ul) scanelf_dir("/usr/lib");
1518 if (!scan_ull) scanelf_dir("/usr/local/lib");
1519 }
1520
1521 /* scan env PATH for paths */
1522 static void scanelf_envpath()
1523 {
1524 char *path, *p;
1525
1526 path = getenv("PATH");
1527 if (!path)
1528 err("PATH is not set in your env !");
1529 path = xstrdup(path);
1530
1531 while ((p = strrchr(path, ':')) != NULL) {
1532 scanelf_dir(p + 1);
1533 *p = 0;
1534 }
1535
1536 free(path);
1537 }
1538
1539 /* usage / invocation handling functions */
1540 #define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:BhV"
1541 #define a_argument required_argument
1542 static struct option const long_opts[] = {
1543 {"path", no_argument, NULL, 'p'},
1544 {"ldpath", no_argument, NULL, 'l'},
1545 {"recursive", no_argument, NULL, 'R'},
1546 {"mount", no_argument, NULL, 'm'},
1547 {"symlink", no_argument, NULL, 'y'},
1548 {"archives", no_argument, NULL, 'A'},
1549 {"ldcache", no_argument, NULL, 'L'},
1550 {"fix", no_argument, NULL, 'X'},
1551 {"setpax", a_argument, NULL, 'z'},
1552 {"pax", no_argument, NULL, 'x'},
1553 {"header", no_argument, NULL, 'e'},
1554 {"textrel", no_argument, NULL, 't'},
1555 {"rpath", no_argument, NULL, 'r'},
1556 {"needed", no_argument, NULL, 'n'},
1557 {"interp", no_argument, NULL, 'i'},
1558 {"bind", no_argument, NULL, 'b'},
1559 {"soname", no_argument, NULL, 'S'},
1560 {"symbol", a_argument, NULL, 's'},
1561 {"section", a_argument, NULL, 'k'},
1562 {"lib", a_argument, NULL, 'N'},
1563 {"gmatch", no_argument, NULL, 'g'},
1564 {"textrels", no_argument, NULL, 'T'},
1565 {"etype", a_argument, NULL, 'E'},
1566 {"bits", a_argument, NULL, 'M'},
1567 {"all", no_argument, NULL, 'a'},
1568 {"quiet", no_argument, NULL, 'q'},
1569 {"verbose", no_argument, NULL, 'v'},
1570 {"format", a_argument, NULL, 'F'},
1571 {"from", a_argument, NULL, 'f'},
1572 {"file", a_argument, NULL, 'o'},
1573 {"nobanner", no_argument, NULL, 'B'},
1574 {"help", no_argument, NULL, 'h'},
1575 {"version", no_argument, NULL, 'V'},
1576 {NULL, no_argument, NULL, 0x0}
1577 };
1578
1579 static const char *opts_help[] = {
1580 "Scan all directories in PATH environment",
1581 "Scan all directories in /etc/ld.so.conf",
1582 "Scan directories recursively",
1583 "Don't recursively cross mount points",
1584 "Don't scan symlinks",
1585 "Scan archives (.a files)",
1586 "Utilize ld.so.cache information (use with -r/-n)",
1587 "Try and 'fix' bad things (use with -r/-e)",
1588 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1589 "Print PaX markings",
1590 "Print GNU_STACK/PT_LOAD markings",
1591 "Print TEXTREL information",
1592 "Print RPATH information",
1593 "Print NEEDED information",
1594 "Print INTERP information",
1595 "Print BIND information",
1596 "Print SONAME information",
1597 "Find a specified symbol",
1598 "Find a specified section",
1599 "Find a specified library",
1600 "Use strncmp to match libraries. (use with -N)",
1601 "Locate cause of TEXTREL",
1602 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1603 "Print only ELF files matching numeric bits",
1604 "Print all scanned info (-x -e -t -r -b)\n",
1605 "Only output 'bad' things",
1606 "Be verbose (can be specified more than once)",
1607 "Use specified format for output",
1608 "Read input stream from a filename",
1609 "Write output stream to a filename",
1610 "Don't display the header",
1611 "Print this help and exit",
1612 "Print version and exit",
1613 NULL
1614 };
1615
1616 /* display usage and exit */
1617 static void usage(int status)
1618 {
1619 unsigned long i;
1620 printf("* Scan ELF binaries for stuff\n\n"
1621 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1622 printf("Options: -[%s]\n", PARSE_FLAGS);
1623 for (i = 0; long_opts[i].name; ++i)
1624 if (long_opts[i].has_arg == no_argument)
1625 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
1626 long_opts[i].name, opts_help[i]);
1627 else
1628 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
1629 long_opts[i].name, opts_help[i]);
1630
1631 if (status != EXIT_SUCCESS)
1632 exit(status);
1633
1634 puts("\nThe format modifiers for the -F option are:");
1635 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1636 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1637 puts(" i INTERP \tb BIND \ts symbol");
1638 puts(" N library \to Type \tT TEXTRELs");
1639 puts(" S SONAME \tk section \ta arch");
1640 puts(" p filename (with search path removed)");
1641 puts(" f filename (short name/basename)");
1642 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1643
1644 puts("\nELF Etypes:");
1645 print_etypes(stdout);
1646
1647 exit(status);
1648 }
1649
1650 /* parse command line arguments and preform needed actions */
1651 #define do_pax_state(option, flag) \
1652 if (islower(option)) { \
1653 flags &= ~PF_##flag; \
1654 flags |= PF_NO##flag; \
1655 } else { \
1656 flags &= ~PF_NO##flag; \
1657 flags |= PF_##flag; \
1658 }
1659 static int parseargs(int argc, char *argv[])
1660 {
1661 int i;
1662 const char *from_file = NULL;
1663 int ret = 0;
1664
1665 opterr = 0;
1666 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1667 switch (i) {
1668
1669 case 'V':
1670 printf("pax-utils-%s: %s compiled %s\n%s\n"
1671 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
1672 VERSION, __FILE__, __DATE__, rcsid, argv0);
1673 exit(EXIT_SUCCESS);
1674 break;
1675 case 'h': usage(EXIT_SUCCESS); break;
1676 case 'f':
1677 if (from_file) warn("You prob don't want to specify -f twice");
1678 from_file = optarg;
1679 break;
1680 case 'E':
1681 strncpy(match_etypes, optarg, sizeof(match_etypes));
1682 break;
1683 case 'M':
1684 match_bits = atoi(optarg);
1685 break;
1686 case 'o': {
1687 if (freopen(optarg, "w", stdout) == NULL)
1688 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1689 break;
1690 }
1691 case 'k':
1692 if (find_section) warn("You prob don't want to specify -k twice");
1693 find_section = optarg;
1694 break;
1695 case 's': {
1696 if (find_sym) warn("You prob don't want to specify -s twice");
1697 find_sym = optarg;
1698 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1699 sprintf(versioned_symname, "%s@", find_sym);
1700 break;
1701 }
1702 case 'N': {
1703 if (find_lib) warn("You prob don't want to specify -N twice");
1704 find_lib = optarg;
1705 break;
1706 }
1707
1708 case 'F': {
1709 if (out_format) warn("You prob don't want to specify -F twice");
1710 out_format = optarg;
1711 break;
1712 }
1713 case 'z': {
1714 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1715 size_t x;
1716
1717 for (x = 0 ; x < strlen(optarg); x++) {
1718 switch(optarg[x]) {
1719 case 'p':
1720 case 'P':
1721 do_pax_state(optarg[x], PAGEEXEC);
1722 break;
1723 case 's':
1724 case 'S':
1725 do_pax_state(optarg[x], SEGMEXEC);
1726 break;
1727 case 'm':
1728 case 'M':
1729 do_pax_state(optarg[x], MPROTECT);
1730 break;
1731 case 'e':
1732 case 'E':
1733 do_pax_state(optarg[x], EMUTRAMP);
1734 break;
1735 case 'r':
1736 case 'R':
1737 do_pax_state(optarg[x], RANDMMAP);
1738 break;
1739 case 'x':
1740 case 'X':
1741 do_pax_state(optarg[x], RANDEXEC);
1742 break;
1743 default:
1744 break;
1745 }
1746 }
1747 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
1748 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
1749 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
1750 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
1751 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1752 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1753 setpax = flags;
1754 break;
1755 }
1756 case 'g': gmatch = 1; break;
1757 case 'L': use_ldcache = 1; break;
1758 case 'y': scan_symlink = 0; break;
1759 case 'A': scan_archives = 1; break;
1760 case 'B': show_banner = 0; break;
1761 case 'l': scan_ldpath = 1; break;
1762 case 'p': scan_envpath = 1; break;
1763 case 'R': dir_recurse = 1; break;
1764 case 'm': dir_crossmount = 0; break;
1765 case 'X': ++fix_elf; break;
1766 case 'x': show_pax = 1; break;
1767 case 'e': show_phdr = 1; break;
1768 case 't': show_textrel = 1; break;
1769 case 'r': show_rpath = 1; break;
1770 case 'n': show_needed = 1; break;
1771 case 'i': show_interp = 1; break;
1772 case 'b': show_bind = 1; break;
1773 case 'S': show_soname = 1; break;
1774 case 'T': show_textrels = 1; break;
1775 case 'q': be_quiet = 1; break;
1776 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1777 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
1778
1779 case ':':
1780 err("Option '%c' is missing parameter", optopt);
1781 case '?':
1782 err("Unknown option '%c' or argument missing", optopt);
1783 default:
1784 err("Unhandled option '%c'; please report this", i);
1785 }
1786 }
1787 if (show_textrels && be_verbose) {
1788 if (which("objdump") != NULL)
1789 has_objdump = 1;
1790 }
1791 /* let the format option override all other options */
1792 if (out_format) {
1793 show_pax = show_phdr = show_textrel = show_rpath = \
1794 show_needed = show_interp = show_bind = show_soname = \
1795 show_textrels = 0;
1796 for (i = 0; out_format[i]; ++i) {
1797 if (!IS_MODIFIER(out_format[i])) continue;
1798
1799 switch (out_format[++i]) {
1800 case '+': break;
1801 case '%': break;
1802 case '#': break;
1803 case 'F': break;
1804 case 'p': break;
1805 case 'f': break;
1806 case 'k': break;
1807 case 's': break;
1808 case 'N': break;
1809 case 'o': break;
1810 case 'a': break;
1811 case 'x': show_pax = 1; break;
1812 case 'e': show_phdr = 1; break;
1813 case 't': show_textrel = 1; break;
1814 case 'r': show_rpath = 1; break;
1815 case 'n': show_needed = 1; break;
1816 case 'i': show_interp = 1; break;
1817 case 'b': show_bind = 1; break;
1818 case 'S': show_soname = 1; break;
1819 case 'T': show_textrels = 1; break;
1820 default:
1821 err("Invalid format specifier '%c' (byte %i)",
1822 out_format[i], i+1);
1823 }
1824 }
1825
1826 /* construct our default format */
1827 } else {
1828 size_t fmt_len = 30;
1829 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
1830 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1831 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1832 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1833 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1834 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1835 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1836 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1837 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1838 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1839 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1840 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1841 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1842 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1843 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1844 }
1845 if (be_verbose > 2) printf("Format: %s\n", out_format);
1846
1847 /* now lets actually do the scanning */
1848 if (scan_ldpath || use_ldcache)
1849 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
1850 if (scan_ldpath) scanelf_ldpath();
1851 if (scan_envpath) scanelf_envpath();
1852 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
1853 from_file = "-";
1854 if (from_file) {
1855 scanelf_from_file(from_file);
1856 from_file = *argv;
1857 }
1858 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1859 err("Nothing to scan !?");
1860 while (optind < argc) {
1861 search_path = argv[optind++];
1862 ret = scanelf_dir(search_path);
1863 }
1864
1865 /* clean up */
1866 free(versioned_symname);
1867 for (i = 0; ldpaths[i]; ++i)
1868 free(ldpaths[i]);
1869
1870 if (ldcache != 0)
1871 munmap(ldcache, ldcache_size);
1872 return ret;
1873 }
1874
1875 static char **get_split_env(const char *envvar)
1876 {
1877 const char *delims = " \t\n";
1878 char **envvals = NULL;
1879 char *env, *s;
1880 int nentry;
1881
1882 if ((env = getenv(envvar)) == NULL)
1883 return NULL;
1884
1885 env = xstrdup(env);
1886 if (env == NULL)
1887 return NULL;
1888
1889 s = strtok(env, delims);
1890 if (s == NULL) {
1891 free(env);
1892 return NULL;
1893 }
1894
1895 nentry = 0;
1896 while (s != NULL) {
1897 ++nentry;
1898 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
1899 envvals[nentry-1] = s;
1900 s = strtok(NULL, delims);
1901 }
1902 envvals[nentry] = NULL;
1903
1904 /* don't want to free(env) as it contains the memory that backs
1905 * the envvals array of strings */
1906 return envvals;
1907 }
1908 static void parseenv()
1909 {
1910 qa_textrels = get_split_env("QA_TEXTRELS");
1911 qa_execstack = get_split_env("QA_EXECSTACK");
1912 qa_wx_load = get_split_env("QA_WX_LOAD");
1913 }
1914
1915 #ifdef __PAX_UTILS_CLEANUP
1916 static void cleanup()
1917 {
1918 free(out_format);
1919 free(qa_textrels);
1920 free(qa_execstack);
1921 free(qa_wx_load);
1922 }
1923 #endif
1924
1925
1926 int main(int argc, char *argv[])
1927 {
1928 int ret;
1929 if (argc < 2)
1930 usage(EXIT_FAILURE);
1931 parseenv();
1932 ret = parseargs(argc, argv);
1933 fclose(stdout);
1934 #ifdef __PAX_UTILS_CLEANUP
1935 cleanup();
1936 warn("The calls to add/delete heap should be off:\n"
1937 "\t- 1 due to the out_buffer not being freed in scanelf_file()\n"
1938 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
1939 #endif
1940 return ret;
1941 }
1942
1943
1944
1945 /* utility funcs */
1946 static char *xstrdup(const char *s)
1947 {
1948 char *ret = strdup(s);
1949 if (!ret) err("Could not strdup(): %s", strerror(errno));
1950 return ret;
1951 }
1952 static void *xmalloc(size_t size)
1953 {
1954 void *ret = malloc(size);
1955 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1956 return ret;
1957 }
1958 static void *xrealloc(void *ptr, size_t size)
1959 {
1960 void *ret = realloc(ptr, size);
1961 if (!ret) err("Could not realloc() %li bytes", (unsigned long)size);
1962 return ret;
1963 }
1964 static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
1965 {
1966 size_t new_len;
1967
1968 new_len = strlen(*dst) + strlen(src);
1969 if (*curr_len <= new_len) {
1970 *curr_len = new_len + (*curr_len / 2);
1971 *dst = realloc(*dst, *curr_len);
1972 if (!*dst)
1973 err("could not realloc() %li bytes", (unsigned long)*curr_len);
1974 }
1975
1976 if (n)
1977 strncat(*dst, src, n);
1978 else
1979 strcat(*dst, src);
1980 }
1981 static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1982 {
1983 static char my_app[2];
1984 my_app[0] = append;
1985 my_app[1] = '\0';
1986 xstrcat(dst, my_app, curr_len);
1987 }
1988
1989 /* Match filename against entries in matchlist, return TRUE
1990 * if the file is listed */
1991 static int file_matches_list(const char *filename, char **matchlist)
1992 {
1993 char **file;
1994 char *match;
1995 char buf[__PAX_UTILS_PATH_MAX];
1996
1997 if (matchlist == NULL)
1998 return 0;
1999
2000 for (file = matchlist; *file != NULL; file++) {
2001 if (search_path) {
2002 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2003 match = buf;
2004 } else {
2005 match = *file;
2006 }
2007 if (fnmatch(match, filename, 0) == 0)
2008 return 1;
2009 }
2010 return 0;
2011 }

  ViewVC Help
Powered by ViewVC 1.1.20