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Revision 1.166 - (show annotations) (download) (as text)
Mon Dec 11 03:31:54 2006 UTC (7 years, 9 months ago) by vapier
Branch: MAIN
Changes since 1.165: +6 -3 lines
File MIME type: text/x-csrc
add support for displaying em_machine via %a format flag

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 1.165 2006/12/11 03:24:03 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 1.165 2006/12/11 03:24:03 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 } \
413 } }
414 SHOW_TEXTRELS(32)
415 SHOW_TEXTRELS(64)
416 }
417 if (!*found_textrels)
418 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
419
420 return NULL;
421 }
422
423 static void rpath_security_checks(elfobj *, char *, const char *);
424 static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
425 {
426 struct stat st;
427 switch (*item) {
428 case '/': break;
429 case '.':
430 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
431 break;
432 case ':':
433 case '\0':
434 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
435 break;
436 case '$':
437 if (fstat(elf->fd, &st) != -1)
438 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
439 warnf("Security problem with %s='%s' in %s with mode set of %o",
440 dt_type, item, elf->filename, st.st_mode & 07777);
441 break;
442 default:
443 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
444 break;
445 }
446 }
447 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
448 {
449 unsigned long i, s;
450 char *rpath, *runpath, **r;
451 void *strtbl_void;
452
453 if (!show_rpath) return;
454
455 strtbl_void = elf_findsecbyname(elf, ".dynstr");
456 rpath = runpath = NULL;
457
458 if (elf->phdr && strtbl_void) {
459 #define SHOW_RPATH(B) \
460 if (elf->elf_class == ELFCLASS ## B) { \
461 Elf ## B ## _Dyn *dyn; \
462 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
463 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
464 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
465 Elf ## B ## _Off offset; \
466 Elf ## B ## _Xword word; \
467 /* Scan all the program headers */ \
468 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
469 /* Just scan dynamic headers */ \
470 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
471 offset = EGET(phdr[i].p_offset); \
472 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
473 /* Just scan dynamic RPATH/RUNPATH headers */ \
474 dyn = DYN ## B (elf->data + offset); \
475 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
476 if (word == DT_RPATH) { \
477 r = &rpath; \
478 } else if (word == DT_RUNPATH) { \
479 r = &runpath; \
480 } else { \
481 ++dyn; \
482 continue; \
483 } \
484 /* Verify the memory is somewhat sane */ \
485 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
486 if (offset < (Elf ## B ## _Off)elf->len) { \
487 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
488 *r = (char*)(elf->data + offset); \
489 /* cache the length in case we need to nuke this section later on */ \
490 if (fix_elf) \
491 offset = strlen(*r); \
492 /* If quiet, don't output paths in ld.so.conf */ \
493 if (be_quiet) { \
494 size_t len; \
495 char *start, *end; \
496 /* note that we only 'chop' off leading known paths. */ \
497 /* since *r is read-only memory, we can only move the ptr forward. */ \
498 start = *r; \
499 /* scan each path in : delimited list */ \
500 while (start) { \
501 rpath_security_checks(elf, start, get_elfdtype(word)); \
502 end = strchr(start, ':'); \
503 len = (end ? abs(end - start) : strlen(start)); \
504 if (use_ldcache) \
505 for (s = 0; ldpaths[s]; ++s) \
506 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
507 *r = end; \
508 /* corner case ... if RPATH reads "/usr/lib:", we want \
509 * to show ':' rather than '' */ \
510 if (end && end[1] != '\0') \
511 (*r)++; \
512 break; \
513 } \
514 if (!*r || !end) \
515 break; \
516 else \
517 start = start + len + 1; \
518 } \
519 } \
520 if (*r) { \
521 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
522 /* just nuke it */ \
523 nuke_it##B: \
524 memset(*r, 0x00, offset); \
525 *r = NULL; \
526 ESET(dyn->d_tag, DT_DEBUG); \
527 ESET(dyn->d_un.d_ptr, 0); \
528 } else if (fix_elf) { \
529 /* try to clean "bad" paths */ \
530 size_t len, tmpdir_len; \
531 char *start, *end; \
532 const char *tmpdir; \
533 start = *r; \
534 tmpdir = (getenv("TMPDIR") ? : "."); \
535 tmpdir_len = strlen(tmpdir); \
536 while (1) { \
537 end = strchr(start, ':'); \
538 if (start == end) { \
539 eat_this_path##B: \
540 len = strlen(end); \
541 memmove(start, end+1, len); \
542 start[len-1] = '\0'; \
543 end = start - 1; \
544 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
545 if (!end) { \
546 if (start == *r) \
547 goto nuke_it##B; \
548 *--start = '\0'; \
549 } else \
550 goto eat_this_path##B; \
551 } \
552 if (!end) \
553 break; \
554 start = end + 1; \
555 } \
556 if (**r == '\0') \
557 goto nuke_it##B; \
558 } \
559 if (*r) \
560 *found_rpath = 1; \
561 } \
562 } \
563 ++dyn; \
564 } \
565 } }
566 SHOW_RPATH(32)
567 SHOW_RPATH(64)
568 }
569
570 if (be_wewy_wewy_quiet) return;
571
572 if (rpath && runpath) {
573 if (!strcmp(rpath, runpath)) {
574 xstrcat(ret, runpath, ret_len);
575 } else {
576 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
577 xchrcat(ret, '{', ret_len);
578 xstrcat(ret, rpath, ret_len);
579 xchrcat(ret, ',', ret_len);
580 xstrcat(ret, runpath, ret_len);
581 xchrcat(ret, '}', ret_len);
582 }
583 } else if (rpath || runpath)
584 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
585 else if (!be_quiet)
586 xstrcat(ret, " - ", ret_len);
587 }
588
589 #define LDSO_CACHE_MAGIC "ld.so-"
590 #define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
591 #define LDSO_CACHE_VER "1.7.0"
592 #define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
593 #define FLAG_ANY -1
594 #define FLAG_TYPE_MASK 0x00ff
595 #define FLAG_LIBC4 0x0000
596 #define FLAG_ELF 0x0001
597 #define FLAG_ELF_LIBC5 0x0002
598 #define FLAG_ELF_LIBC6 0x0003
599 #define FLAG_REQUIRED_MASK 0xff00
600 #define FLAG_SPARC_LIB64 0x0100
601 #define FLAG_IA64_LIB64 0x0200
602 #define FLAG_X8664_LIB64 0x0300
603 #define FLAG_S390_LIB64 0x0400
604 #define FLAG_POWERPC_LIB64 0x0500
605 #define FLAG_MIPS64_LIBN32 0x0600
606 #define FLAG_MIPS64_LIBN64 0x0700
607
608 static char *lookup_cache_lib(elfobj *, char *);
609
610 #if defined(__GLIBC__) || defined(__UCLIBC__)
611
612 static char *lookup_cache_lib(elfobj *elf, char *fname)
613 {
614 int fd = 0;
615 char *strs;
616 static char buf[__PAX_UTILS_PATH_MAX] = "";
617 const char *cachefile = "/etc/ld.so.cache";
618 struct stat st;
619
620 typedef struct {
621 char magic[LDSO_CACHE_MAGIC_LEN];
622 char version[LDSO_CACHE_VER_LEN];
623 int nlibs;
624 } header_t;
625 header_t *header;
626
627 typedef struct {
628 int flags;
629 int sooffset;
630 int liboffset;
631 } libentry_t;
632 libentry_t *libent;
633
634 if (fname == NULL)
635 return NULL;
636
637 if (ldcache == 0) {
638 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1)
639 return NULL;
640
641 /* cache these values so we only map/unmap the cache file once */
642 ldcache_size = st.st_size;
643 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
644
645 close(fd);
646
647 if (ldcache == (caddr_t)-1) {
648 ldcache = 0;
649 return NULL;
650 }
651
652 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
653 return NULL;
654 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
655 return NULL;
656 }
657
658 header = (header_t *) ldcache;
659 libent = (libentry_t *) (ldcache + sizeof(header_t));
660 strs = (char *) &libent[header->nlibs];
661
662 for (fd = 0; fd < header->nlibs; fd++) {
663 /* this should be more fine grained, but for now we assume that
664 * diff arches will not be cached together. and we ignore the
665 * the different multilib mips cases. */
666 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
667 continue;
668 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
669 continue;
670
671 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
672 continue;
673 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
674 }
675 return buf;
676 }
677 #elif defined(__NetBSD__)
678 static char *lookup_cache_lib(elfobj *elf, char *fname)
679 {
680 static char buf[__PAX_UTILS_PATH_MAX] = "";
681 static struct stat st;
682
683 char **ldpath;
684 for (ldpath = ldpaths; *ldpath != NULL; ldpath++) {
685 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", *ldpath, fname) >= sizeof(buf))
686 continue; /* if the pathname is too long, or something went wrong, ignore */
687
688 if (stat(buf, &st) != 0)
689 continue; /* if the lib doesn't exist in *ldpath, look further */
690
691 /* NetBSD doesn't actually do sanity checks, it just loads the file
692 * and if that doesn't work, continues looking in other directories.
693 * This cannot easily be safely emulated, unfortunately. For now,
694 * just assume that if it exists, it's a valid library. */
695
696 return buf;
697 }
698
699 /* not found in any path */
700 return NULL;
701 }
702 #else
703 #warning Cache support not implemented for your target
704 static char *lookup_cache_lib(elfobj *elf, char *fname)
705 {
706 return NULL;
707 }
708 #endif
709
710 static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
711 {
712 unsigned long i;
713 char *needed;
714 void *strtbl_void;
715 char *p;
716
717 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
718
719 strtbl_void = elf_findsecbyname(elf, ".dynstr");
720
721 if (elf->phdr && strtbl_void) {
722 #define SHOW_NEEDED(B) \
723 if (elf->elf_class == ELFCLASS ## B) { \
724 Elf ## B ## _Dyn *dyn; \
725 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
726 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
727 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
728 Elf ## B ## _Off offset; \
729 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
730 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
731 offset = EGET(phdr[i].p_offset); \
732 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
733 dyn = DYN ## B (elf->data + offset); \
734 while (EGET(dyn->d_tag) != DT_NULL) { \
735 if (EGET(dyn->d_tag) == DT_NEEDED) { \
736 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
737 if (offset >= (Elf ## B ## _Off)elf->len) { \
738 ++dyn; \
739 continue; \
740 } \
741 needed = (char*)(elf->data + offset); \
742 if (op == 0) { \
743 if (!be_wewy_wewy_quiet) { \
744 if (*found_needed) xchrcat(ret, ',', ret_len); \
745 if (use_ldcache) \
746 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
747 needed = p; \
748 xstrcat(ret, needed, ret_len); \
749 } \
750 *found_needed = 1; \
751 } else { \
752 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \
753 *found_lib = 1; \
754 return (be_wewy_wewy_quiet ? NULL : needed); \
755 } \
756 } \
757 } \
758 ++dyn; \
759 } \
760 } }
761 SHOW_NEEDED(32)
762 SHOW_NEEDED(64)
763 if (op == 0 && !*found_needed && be_verbose)
764 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
765 }
766
767 return NULL;
768 }
769 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
770 {
771 void *strtbl_void;
772
773 if (!show_interp) return NULL;
774
775 strtbl_void = elf_findsecbyname(elf, ".interp");
776
777 if (strtbl_void) {
778 #define SHOW_INTERP(B) \
779 if (elf->elf_class == ELFCLASS ## B) { \
780 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
781 *found_interp = 1; \
782 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
783 }
784 SHOW_INTERP(32)
785 SHOW_INTERP(64)
786 }
787 return NULL;
788 }
789 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
790 {
791 unsigned long i;
792 struct stat s;
793 char dynamic = 0;
794
795 if (!show_bind) return NULL;
796 if (!elf->phdr) return NULL;
797
798 #define SHOW_BIND(B) \
799 if (elf->elf_class == ELFCLASS ## B) { \
800 Elf ## B ## _Dyn *dyn; \
801 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
802 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
803 Elf ## B ## _Off offset; \
804 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
805 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
806 dynamic = 1; \
807 offset = EGET(phdr[i].p_offset); \
808 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
809 dyn = DYN ## B (elf->data + offset); \
810 while (EGET(dyn->d_tag) != DT_NULL) { \
811 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
812 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
813 { \
814 if (be_quiet) return NULL; \
815 *found_bind = 1; \
816 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
817 } \
818 ++dyn; \
819 } \
820 } \
821 }
822 SHOW_BIND(32)
823 SHOW_BIND(64)
824
825 if (be_wewy_wewy_quiet) return NULL;
826
827 /* don't output anything if quiet mode and the ELF is static or not setuid */
828 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
829 return NULL;
830 } else {
831 *found_bind = 1;
832 return (char *) (dynamic ? "LAZY" : "STATIC");
833 }
834 }
835 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
836 {
837 unsigned long i;
838 char *soname;
839 void *strtbl_void;
840
841 if (!show_soname) return NULL;
842
843 strtbl_void = elf_findsecbyname(elf, ".dynstr");
844
845 if (elf->phdr && strtbl_void) {
846 #define SHOW_SONAME(B) \
847 if (elf->elf_class == ELFCLASS ## B) { \
848 Elf ## B ## _Dyn *dyn; \
849 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
850 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
851 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
852 Elf ## B ## _Off offset; \
853 /* only look for soname in shared objects */ \
854 if (ehdr->e_type != ET_DYN) \
855 return NULL; \
856 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
857 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
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_SONAME) { \
863 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
864 if (offset >= (Elf ## B ## _Off)elf->len) { \
865 ++dyn; \
866 continue; \
867 } \
868 soname = (char*)(elf->data + offset); \
869 *found_soname = 1; \
870 return (be_wewy_wewy_quiet ? NULL : soname); \
871 } \
872 ++dyn; \
873 } \
874 } }
875 SHOW_SONAME(32)
876 SHOW_SONAME(64)
877 }
878
879 return NULL;
880 }
881 static char *scanelf_file_sym(elfobj *elf, char *found_sym)
882 {
883 unsigned long i;
884 char *ret;
885 void *symtab_void, *strtab_void;
886
887 if (!find_sym) return NULL;
888 ret = find_sym;
889
890 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
891
892 if (symtab_void && strtab_void) {
893 #define FIND_SYM(B) \
894 if (elf->elf_class == ELFCLASS ## B) { \
895 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
896 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
897 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
898 unsigned long cnt = EGET(symtab->sh_entsize); \
899 char *symname; \
900 if (cnt) \
901 cnt = EGET(symtab->sh_size) / cnt; \
902 for (i = 0; i < cnt; ++i) { \
903 if (sym->st_name) { \
904 /* make sure the symbol name is in acceptable memory range */ \
905 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
906 if ((void*)symname > (void*)elf->data_end) { \
907 warnf("%s: corrupt ELF symbols", elf->filename); \
908 ++sym; \
909 continue; \
910 } \
911 /* debug display ... show all symbols and some extra info */ \
912 if (*ret == '*') { \
913 printf("%s(%s) %5lX %15s %s\n", \
914 ((*found_sym == 0) ? "\n\t" : "\t"), \
915 elf->base_filename, \
916 (unsigned long)sym->st_size, \
917 get_elfstttype(sym->st_info), \
918 symname); \
919 *found_sym = 1; \
920 } else { \
921 /* allow the user to specify a comma delimited list of symbols to search for */ \
922 char *this_sym, *this_sym_ver, *next_sym; \
923 this_sym = ret; \
924 this_sym_ver = versioned_symname; \
925 do { \
926 next_sym = strchr(this_sym, ','); \
927 if (next_sym == NULL) \
928 next_sym = this_sym + strlen(this_sym); \
929 /* do we want a defined symbol ? */ \
930 if (*this_sym == '+') { \
931 if (sym->st_shndx == SHN_UNDEF) \
932 goto skip_this_sym##B; \
933 ++this_sym; \
934 ++this_sym_ver; \
935 /* do we want an undefined symbol ? */ \
936 } else if (*this_sym == '-') { \
937 if (sym->st_shndx != SHN_UNDEF) \
938 goto skip_this_sym##B; \
939 ++this_sym; \
940 ++this_sym_ver; \
941 } \
942 /* ok, lets compare the name now */ \
943 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
944 (strncmp(this_sym_ver, symname, strlen(this_sym_ver)) == 0)) { \
945 if (be_semi_verbose) { \
946 char buf[126]; \
947 snprintf(buf, sizeof(buf), "%lX %s %s", \
948 (unsigned long)sym->st_size, get_elfstttype(sym->st_info), this_sym); \
949 ret = buf; \
950 } else \
951 ret = this_sym; \
952 (*found_sym)++; \
953 goto break_out; \
954 } \
955 skip_this_sym##B: this_sym = next_sym + 1; \
956 } while (*next_sym != '\0'); \
957 } \
958 } \
959 ++sym; \
960 } }
961 FIND_SYM(32)
962 FIND_SYM(64)
963 }
964
965 break_out:
966 if (be_wewy_wewy_quiet) return NULL;
967
968 if (*find_sym != '*' && *found_sym)
969 return ret;
970 if (be_quiet)
971 return NULL;
972 else
973 return (char *)" - ";
974 }
975
976
977 static char *scanelf_file_sections(elfobj *elf, char *found_section)
978 {
979 if (!find_section)
980 return NULL;
981
982 #define FIND_SECTION(B) \
983 if (elf->elf_class == ELFCLASS ## B) { \
984 int invert; \
985 Elf ## B ## _Shdr *section; \
986 invert = (*find_section == '!' ? 1 : 0); \
987 section = SHDR ## B (elf_findsecbyname(elf, find_section+invert)); \
988 if ((section == NULL && invert) || (section != NULL && !invert)) \
989 *found_section = 1; \
990 }
991 FIND_SECTION(32)
992 FIND_SECTION(64)
993
994 if (be_wewy_wewy_quiet)
995 return NULL;
996
997 if (*found_section)
998 return find_section;
999
1000 if (be_quiet)
1001 return NULL;
1002 else
1003 return (char *)" - ";
1004 }
1005
1006 /* scan an elf file and show all the fun stuff */
1007 #define prints(str) write(fileno(stdout), str, strlen(str))
1008 static int scanelf_elfobj(elfobj *elf)
1009 {
1010 unsigned long i;
1011 char found_pax, found_phdr, found_relro, found_load, found_textrel,
1012 found_rpath, found_needed, found_interp, found_bind, found_soname,
1013 found_sym, found_lib, found_file, found_textrels, found_section;
1014 static char *out_buffer = NULL;
1015 static size_t out_len;
1016
1017 found_pax = found_phdr = found_relro = found_load = found_textrel = \
1018 found_rpath = found_needed = found_interp = found_bind = found_soname = \
1019 found_sym = found_lib = found_file = found_textrels = found_section = 0;
1020
1021 if (be_verbose > 2)
1022 printf("%s: scanning file {%s,%s}\n", elf->filename,
1023 get_elfeitype(EI_CLASS, elf->elf_class),
1024 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
1025 else if (be_verbose > 1)
1026 printf("%s: scanning file\n", elf->filename);
1027
1028 /* init output buffer */
1029 if (!out_buffer) {
1030 out_len = sizeof(char) * 80;
1031 out_buffer = (char*)xmalloc(out_len);
1032 }
1033 *out_buffer = '\0';
1034
1035 /* show the header */
1036 if (!be_quiet && show_banner) {
1037 for (i = 0; out_format[i]; ++i) {
1038 if (!IS_MODIFIER(out_format[i])) continue;
1039
1040 switch (out_format[++i]) {
1041 case '+': break;
1042 case '%': break;
1043 case '#': break;
1044 case 'F':
1045 case 'p':
1046 case 'f': prints("FILE "); found_file = 1; break;
1047 case 'o': prints(" TYPE "); break;
1048 case 'x': prints(" PAX "); break;
1049 case 'e': prints("STK/REL/PTL "); break;
1050 case 't': prints("TEXTREL "); break;
1051 case 'r': prints("RPATH "); break;
1052 case 'n': prints("NEEDED "); break;
1053 case 'i': prints("INTERP "); break;
1054 case 'b': prints("BIND "); break;
1055 case 'S': prints("SONAME "); break;
1056 case 's': prints("SYM "); break;
1057 case 'N': prints("LIB "); break;
1058 case 'T': prints("TEXTRELS "); break;
1059 case 'k': prints("SECTION "); break;
1060 case 'a': prints("ARCH "); break;
1061 default: warnf("'%c' has no title ?", out_format[i]);
1062 }
1063 }
1064 if (!found_file) prints("FILE ");
1065 prints("\n");
1066 found_file = 0;
1067 show_banner = 0;
1068 }
1069
1070 /* dump all the good stuff */
1071 for (i = 0; out_format[i]; ++i) {
1072 const char *out;
1073 const char *tmp;
1074
1075 if (!IS_MODIFIER(out_format[i])) {
1076 xchrcat(&out_buffer, out_format[i], &out_len);
1077 continue;
1078 }
1079
1080 out = NULL;
1081 be_wewy_wewy_quiet = (out_format[i] == '#');
1082 be_semi_verbose = (out_format[i] == '+');
1083 switch (out_format[++i]) {
1084 case '+':
1085 case '%':
1086 case '#':
1087 xchrcat(&out_buffer, out_format[i], &out_len); break;
1088 case 'F':
1089 found_file = 1;
1090 if (be_wewy_wewy_quiet) break;
1091 xstrcat(&out_buffer, elf->filename, &out_len);
1092 break;
1093 case 'p':
1094 found_file = 1;
1095 if (be_wewy_wewy_quiet) break;
1096 tmp = elf->filename;
1097 if (search_path) {
1098 ssize_t len_search = strlen(search_path);
1099 ssize_t len_file = strlen(elf->filename);
1100 if (!strncmp(elf->filename, search_path, len_search) && \
1101 len_file > len_search)
1102 tmp += len_search;
1103 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1104 }
1105 xstrcat(&out_buffer, tmp, &out_len);
1106 break;
1107 case 'f':
1108 found_file = 1;
1109 if (be_wewy_wewy_quiet) break;
1110 tmp = strrchr(elf->filename, '/');
1111 tmp = (tmp == NULL ? elf->filename : tmp+1);
1112 xstrcat(&out_buffer, tmp, &out_len);
1113 break;
1114 case 'o': out = get_elfetype(elf); break;
1115 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
1116 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
1117 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1118 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
1119 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1120 case 'n':
1121 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
1122 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1123 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1124 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
1125 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1126 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1127 case 'a': out = get_elfemtype(elf); break;
1128 default: warnf("'%c' has no scan code?", out_format[i]);
1129 }
1130 if (out) {
1131 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
1132 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
1133 xstrncat(&out_buffer, out, &out_len, (tmp-out));
1134 else
1135 xstrcat(&out_buffer, out, &out_len);
1136 }
1137 }
1138
1139 #define FOUND_SOMETHING() \
1140 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1141 found_rpath || found_needed || found_interp || found_bind || \
1142 found_soname || found_sym || found_lib || found_textrels || found_section )
1143
1144 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1145 xchrcat(&out_buffer, ' ', &out_len);
1146 xstrcat(&out_buffer, elf->filename, &out_len);
1147 }
1148 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
1149 puts(out_buffer);
1150 fflush(stdout);
1151 }
1152
1153 return 0;
1154 }
1155
1156 /* scan a single elf */
1157 static int scanelf_elf(const char *filename, int fd, size_t len)
1158 {
1159 int ret = 1;
1160 elfobj *elf;
1161
1162 /* verify this is real ELF */
1163 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1164 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1165 return ret;
1166 }
1167 switch (match_bits) {
1168 case 32:
1169 if (elf->elf_class != ELFCLASS32)
1170 goto label_done;
1171 break;
1172 case 64:
1173 if (elf->elf_class != ELFCLASS64)
1174 goto label_done;
1175 break;
1176 default: break;
1177 }
1178 if (strlen(match_etypes)) {
1179 char sbuf[126];
1180 strncpy(sbuf, match_etypes, sizeof(sbuf));
1181 if (strchr(match_etypes, ',') != NULL) {
1182 char *p;
1183 while((p = strrchr(sbuf, ',')) != NULL) {
1184 *p = 0;
1185 if (etype_lookup(p+1) == get_etype(elf))
1186 goto label_ret;
1187 }
1188 }
1189 if (etype_lookup(sbuf) != get_etype(elf))
1190 goto label_done;
1191 }
1192
1193 label_ret:
1194 ret = scanelf_elfobj(elf);
1195
1196 label_done:
1197 unreadelf(elf);
1198 return ret;
1199 }
1200
1201 /* scan an archive of elfs */
1202 static int scanelf_archive(const char *filename, int fd, size_t len)
1203 {
1204 archive_handle *ar;
1205 archive_member *m;
1206 char *ar_buffer;
1207 elfobj *elf;
1208
1209 ar = ar_open_fd(filename, fd);
1210 if (ar == NULL)
1211 return 1;
1212
1213 ar_buffer = (char*)mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1214 while ((m=ar_next(ar)) != NULL) {
1215 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size);
1216 if (elf) {
1217 scanelf_elfobj(elf);
1218 unreadelf(elf);
1219 }
1220 }
1221 munmap(ar_buffer, len);
1222
1223 return 0;
1224 }
1225 /* scan a file which may be an elf or an archive or some other magical beast */
1226 static int scanelf_file(const char *filename, const struct stat *st_cache)
1227 {
1228 const struct stat *st = st_cache;
1229 struct stat symlink_st;
1230 int fd;
1231
1232 /* always handle regular files and handle symlinked files if no -y */
1233 if (S_ISLNK(st->st_mode)) {
1234 if (!scan_symlink) return 1;
1235 stat(filename, &symlink_st);
1236 st = &symlink_st;
1237 }
1238
1239 if (!S_ISREG(st->st_mode)) {
1240 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1241 return 1;
1242 }
1243
1244 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1245 return 1;
1246
1247 if (scanelf_elf(filename, fd, st->st_size) == 1 && scan_archives)
1248 /* if it isn't an ELF, maybe it's an .a archive */
1249 scanelf_archive(filename, fd, st->st_size);
1250
1251 close(fd);
1252 return 0;
1253 }
1254
1255 /* scan a directory for ET_EXEC files and print when we find one */
1256 static int scanelf_dir(const char *path)
1257 {
1258 register DIR *dir;
1259 register struct dirent *dentry;
1260 struct stat st_top, st;
1261 char buf[__PAX_UTILS_PATH_MAX];
1262 size_t pathlen = 0, len = 0;
1263 int ret = 0;
1264
1265 /* make sure path exists */
1266 if (lstat(path, &st_top) == -1) {
1267 if (be_verbose > 2) printf("%s: does not exist\n", path);
1268 return 1;
1269 }
1270
1271 /* ok, if it isn't a directory, assume we can open it */
1272 if (!S_ISDIR(st_top.st_mode)) {
1273 return scanelf_file(path, &st_top);
1274 }
1275
1276 /* now scan the dir looking for fun stuff */
1277 if ((dir = opendir(path)) == NULL) {
1278 warnf("could not opendir %s: %s", path, strerror(errno));
1279 return 1;
1280 }
1281 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1282
1283 pathlen = strlen(path);
1284 while ((dentry = readdir(dir))) {
1285 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1286 continue;
1287 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
1288 if (len >= sizeof(buf)) {
1289 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1290 (unsigned long)len, (unsigned long)sizeof(buf));
1291 continue;
1292 }
1293 snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name);
1294 if (lstat(buf, &st) != -1) {
1295 if (S_ISREG(st.st_mode))
1296 ret = scanelf_file(buf, &st);
1297 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1298 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1299 ret = scanelf_dir(buf);
1300 }
1301 }
1302 }
1303 closedir(dir);
1304 return ret;
1305 }
1306
1307 static int scanelf_from_file(const char *filename)
1308 {
1309 FILE *fp = NULL;
1310 char *p;
1311 char path[__PAX_UTILS_PATH_MAX];
1312 int ret = 0;
1313
1314 if (strcmp(filename, "-") == 0)
1315 fp = stdin;
1316 else if ((fp = fopen(filename, "r")) == NULL)
1317 return 1;
1318
1319 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1320 if ((p = strchr(path, '\n')) != NULL)
1321 *p = 0;
1322 search_path = path;
1323 ret = scanelf_dir(path);
1324 }
1325 if (fp != stdin)
1326 fclose(fp);
1327 return ret;
1328 }
1329
1330 #if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1331
1332 static int load_ld_cache_config(int i, const char *fname)
1333 {
1334 FILE *fp = NULL;
1335 char *p;
1336 char path[__PAX_UTILS_PATH_MAX];
1337
1338 if (i + 1 == ARRAY_SIZE(ldpaths))
1339 return i;
1340
1341 if ((fp = fopen(fname, "r")) == NULL)
1342 return i;
1343
1344 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1345 if ((p = strrchr(path, '\r')) != NULL)
1346 *p = 0;
1347 if ((p = strchr(path, '\n')) != NULL)
1348 *p = 0;
1349 #ifdef __linux__
1350 // recursive includes of the same file will make this segfault.
1351 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1352 glob64_t gl;
1353 size_t x;
1354 char gpath[__PAX_UTILS_PATH_MAX];
1355
1356 memset(gpath, 0, sizeof(gpath));
1357
1358 if (path[8] != '/')
1359 snprintf(gpath, sizeof(gpath), "/etc/%s", &path[8]);
1360 else
1361 strncpy(gpath, &path[8], sizeof(gpath));
1362
1363 if ((glob64(gpath, 0, NULL, &gl)) == 0) {
1364 for (x = 0; x < gl.gl_pathc; ++x) {
1365 /* try to avoid direct loops */
1366 if (strcmp(gl.gl_pathv[x], fname) == 0)
1367 continue;
1368 i = load_ld_cache_config(i, gl.gl_pathv[x]);
1369 if (i + 1 >= ARRAY_SIZE(ldpaths)) {
1370 globfree64(&gl);
1371 return i;
1372 }
1373 }
1374 globfree64 (&gl);
1375 continue;
1376 }
1377 }
1378 #endif
1379 if (*path != '/')
1380 continue;
1381
1382 ldpaths[i++] = xstrdup(path);
1383
1384 if (i + 1 == ARRAY_SIZE(ldpaths))
1385 break;
1386 }
1387 ldpaths[i] = NULL;
1388
1389 fclose(fp);
1390 return i;
1391 }
1392
1393 #elif defined(__FreeBSD__) || (__DragonFly__)
1394
1395 static int load_ld_cache_config(int i, const char *fname)
1396 {
1397 FILE *fp = NULL;
1398 char *b = NULL, *p;
1399 struct elfhints_hdr hdr;
1400
1401 if (i + 1 == ARRAY_SIZE(ldpaths))
1402 return i;
1403
1404 if ((fp = fopen(fname, "r")) == NULL)
1405 return i;
1406
1407 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1408 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1409 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1410 {
1411 fclose(fp);
1412 return i;
1413 }
1414
1415 b = (char*)malloc(hdr.dirlistlen+1);
1416 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1417 fclose(fp);
1418 free(b);
1419 return i;
1420 }
1421
1422 while ((p = strsep(&b, ":"))) {
1423 if (*p == '\0') continue;
1424 ldpaths[i++] = xstrdup(p);
1425
1426 if (i + 1 == ARRAY_SIZE(ldpaths))
1427 break;
1428 }
1429 ldpaths[i] = NULL;
1430
1431 free(b);
1432 fclose(fp);
1433 return i;
1434 }
1435
1436 #else
1437
1438 #warning Cache config support not implemented for your target
1439 static int load_ld_cache_config(int i, const char *fname)
1440 {
1441 memset(ldpaths, 0x00, sizeof(ldpaths));
1442 }
1443
1444 #endif
1445
1446 /* scan /etc/ld.so.conf for paths */
1447 static void scanelf_ldpath()
1448 {
1449 char scan_l, scan_ul, scan_ull;
1450 int i = 0;
1451
1452 if (!ldpaths[0])
1453 err("Unable to load any paths from ld.so.conf");
1454
1455 scan_l = scan_ul = scan_ull = 0;
1456
1457 while (ldpaths[i]) {
1458 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
1459 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
1460 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
1461 scanelf_dir(ldpaths[i]);
1462 ++i;
1463 }
1464
1465 if (!scan_l) scanelf_dir("/lib");
1466 if (!scan_ul) scanelf_dir("/usr/lib");
1467 if (!scan_ull) scanelf_dir("/usr/local/lib");
1468 }
1469
1470 /* scan env PATH for paths */
1471 static void scanelf_envpath()
1472 {
1473 char *path, *p;
1474
1475 path = getenv("PATH");
1476 if (!path)
1477 err("PATH is not set in your env !");
1478 path = xstrdup(path);
1479
1480 while ((p = strrchr(path, ':')) != NULL) {
1481 scanelf_dir(p + 1);
1482 *p = 0;
1483 }
1484
1485 free(path);
1486 }
1487
1488 /* usage / invocation handling functions */
1489 #define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:BhV"
1490 #define a_argument required_argument
1491 static struct option const long_opts[] = {
1492 {"path", no_argument, NULL, 'p'},
1493 {"ldpath", no_argument, NULL, 'l'},
1494 {"recursive", no_argument, NULL, 'R'},
1495 {"mount", no_argument, NULL, 'm'},
1496 {"symlink", no_argument, NULL, 'y'},
1497 {"archives", no_argument, NULL, 'A'},
1498 {"ldcache", no_argument, NULL, 'L'},
1499 {"fix", no_argument, NULL, 'X'},
1500 {"setpax", a_argument, NULL, 'z'},
1501 {"pax", no_argument, NULL, 'x'},
1502 {"header", no_argument, NULL, 'e'},
1503 {"textrel", no_argument, NULL, 't'},
1504 {"rpath", no_argument, NULL, 'r'},
1505 {"needed", no_argument, NULL, 'n'},
1506 {"interp", no_argument, NULL, 'i'},
1507 {"bind", no_argument, NULL, 'b'},
1508 {"soname", no_argument, NULL, 'S'},
1509 {"symbol", a_argument, NULL, 's'},
1510 {"section", a_argument, NULL, 'k'},
1511 {"lib", a_argument, NULL, 'N'},
1512 {"gmatch", no_argument, NULL, 'g'},
1513 {"textrels", no_argument, NULL, 'T'},
1514 {"etype", a_argument, NULL, 'E'},
1515 {"bits", a_argument, NULL, 'M'},
1516 {"all", no_argument, NULL, 'a'},
1517 {"quiet", no_argument, NULL, 'q'},
1518 {"verbose", no_argument, NULL, 'v'},
1519 {"format", a_argument, NULL, 'F'},
1520 {"from", a_argument, NULL, 'f'},
1521 {"file", a_argument, NULL, 'o'},
1522 {"nobanner", no_argument, NULL, 'B'},
1523 {"help", no_argument, NULL, 'h'},
1524 {"version", no_argument, NULL, 'V'},
1525 {NULL, no_argument, NULL, 0x0}
1526 };
1527
1528 static const char *opts_help[] = {
1529 "Scan all directories in PATH environment",
1530 "Scan all directories in /etc/ld.so.conf",
1531 "Scan directories recursively",
1532 "Don't recursively cross mount points",
1533 "Don't scan symlinks",
1534 "Scan archives (.a files)",
1535 "Utilize ld.so.cache information (use with -r/-n)",
1536 "Try and 'fix' bad things (use with -r/-e)",
1537 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1538 "Print PaX markings",
1539 "Print GNU_STACK/PT_LOAD markings",
1540 "Print TEXTREL information",
1541 "Print RPATH information",
1542 "Print NEEDED information",
1543 "Print INTERP information",
1544 "Print BIND information",
1545 "Print SONAME information",
1546 "Find a specified symbol",
1547 "Find a specified section",
1548 "Find a specified library",
1549 "Use strncmp to match libraries. (use with -N)",
1550 "Locate cause of TEXTREL",
1551 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1552 "Print only ELF files matching numeric bits",
1553 "Print all scanned info (-x -e -t -r -b)\n",
1554 "Only output 'bad' things",
1555 "Be verbose (can be specified more than once)",
1556 "Use specified format for output",
1557 "Read input stream from a filename",
1558 "Write output stream to a filename",
1559 "Don't display the header",
1560 "Print this help and exit",
1561 "Print version and exit",
1562 NULL
1563 };
1564
1565 /* display usage and exit */
1566 static void usage(int status)
1567 {
1568 unsigned long i;
1569 printf("* Scan ELF binaries for stuff\n\n"
1570 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1571 printf("Options: -[%s]\n", PARSE_FLAGS);
1572 for (i = 0; long_opts[i].name; ++i)
1573 if (long_opts[i].has_arg == no_argument)
1574 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
1575 long_opts[i].name, opts_help[i]);
1576 else
1577 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
1578 long_opts[i].name, opts_help[i]);
1579
1580 if (status != EXIT_SUCCESS)
1581 exit(status);
1582
1583 puts("\nThe format modifiers for the -F option are:");
1584 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1585 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1586 puts(" i INTERP \tb BIND \ts symbol");
1587 puts(" N library \to Type \tT TEXTRELs");
1588 puts(" S SONAME \tk section \ta arch");
1589 puts(" p filename (with search path removed)");
1590 puts(" f filename (short name/basename)");
1591 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1592
1593 puts("\nELF Etypes:");
1594 print_etypes(stdout);
1595
1596 exit(status);
1597 }
1598
1599 /* parse command line arguments and preform needed actions */
1600 #define do_pax_state(option, flag) \
1601 if (islower(option)) { \
1602 flags &= ~PF_##flag; \
1603 flags |= PF_NO##flag; \
1604 } else { \
1605 flags &= ~PF_NO##flag; \
1606 flags |= PF_##flag; \
1607 }
1608 static int parseargs(int argc, char *argv[])
1609 {
1610 int i;
1611 const char *from_file = NULL;
1612 int ret = 0;
1613
1614 opterr = 0;
1615 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1616 switch (i) {
1617
1618 case 'V':
1619 printf("pax-utils-%s: %s compiled %s\n%s\n"
1620 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
1621 VERSION, __FILE__, __DATE__, rcsid, argv0);
1622 exit(EXIT_SUCCESS);
1623 break;
1624 case 'h': usage(EXIT_SUCCESS); break;
1625 case 'f':
1626 if (from_file) warn("You prob don't want to specify -f twice");
1627 from_file = optarg;
1628 break;
1629 case 'E':
1630 strncpy(match_etypes, optarg, sizeof(match_etypes));
1631 break;
1632 case 'M':
1633 match_bits = atoi(optarg);
1634 break;
1635 case 'o': {
1636 if (freopen(optarg, "w", stdout) == NULL)
1637 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1638 break;
1639 }
1640 case 'k':
1641 if (find_section) warn("You prob don't want to specify -k twice");
1642 find_section = optarg;
1643 break;
1644 case 's': {
1645 if (find_sym) warn("You prob don't want to specify -s twice");
1646 find_sym = optarg;
1647 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1648 sprintf(versioned_symname, "%s@", find_sym);
1649 break;
1650 }
1651 case 'N': {
1652 if (find_lib) warn("You prob don't want to specify -N twice");
1653 find_lib = optarg;
1654 break;
1655 }
1656
1657 case 'F': {
1658 if (out_format) warn("You prob don't want to specify -F twice");
1659 out_format = optarg;
1660 break;
1661 }
1662 case 'z': {
1663 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1664 size_t x;
1665
1666 for (x = 0 ; x < strlen(optarg); x++) {
1667 switch(optarg[x]) {
1668 case 'p':
1669 case 'P':
1670 do_pax_state(optarg[x], PAGEEXEC);
1671 break;
1672 case 's':
1673 case 'S':
1674 do_pax_state(optarg[x], SEGMEXEC);
1675 break;
1676 case 'm':
1677 case 'M':
1678 do_pax_state(optarg[x], MPROTECT);
1679 break;
1680 case 'e':
1681 case 'E':
1682 do_pax_state(optarg[x], EMUTRAMP);
1683 break;
1684 case 'r':
1685 case 'R':
1686 do_pax_state(optarg[x], RANDMMAP);
1687 break;
1688 case 'x':
1689 case 'X':
1690 do_pax_state(optarg[x], RANDEXEC);
1691 break;
1692 default:
1693 break;
1694 }
1695 }
1696 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
1697 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
1698 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
1699 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
1700 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1701 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1702 setpax = flags;
1703 break;
1704 }
1705 case 'g': gmatch = 1; break;
1706 case 'L': use_ldcache = 1; break;
1707 case 'y': scan_symlink = 0; break;
1708 case 'A': scan_archives = 1; break;
1709 case 'B': show_banner = 0; break;
1710 case 'l': scan_ldpath = 1; break;
1711 case 'p': scan_envpath = 1; break;
1712 case 'R': dir_recurse = 1; break;
1713 case 'm': dir_crossmount = 0; break;
1714 case 'X': ++fix_elf; break;
1715 case 'x': show_pax = 1; break;
1716 case 'e': show_phdr = 1; break;
1717 case 't': show_textrel = 1; break;
1718 case 'r': show_rpath = 1; break;
1719 case 'n': show_needed = 1; break;
1720 case 'i': show_interp = 1; break;
1721 case 'b': show_bind = 1; break;
1722 case 'S': show_soname = 1; break;
1723 case 'T': show_textrels = 1; break;
1724 case 'q': be_quiet = 1; break;
1725 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1726 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
1727
1728 case ':':
1729 err("Option '%c' is missing parameter", optopt);
1730 case '?':
1731 err("Unknown option '%c' or argument missing", optopt);
1732 default:
1733 err("Unhandled option '%c'; please report this", i);
1734 }
1735 }
1736
1737 /* let the format option override all other options */
1738 if (out_format) {
1739 show_pax = show_phdr = show_textrel = show_rpath = \
1740 show_needed = show_interp = show_bind = show_soname = \
1741 show_textrels = 0;
1742 for (i = 0; out_format[i]; ++i) {
1743 if (!IS_MODIFIER(out_format[i])) continue;
1744
1745 switch (out_format[++i]) {
1746 case '+': break;
1747 case '%': break;
1748 case '#': break;
1749 case 'F': break;
1750 case 'p': break;
1751 case 'f': break;
1752 case 'k': break;
1753 case 's': break;
1754 case 'N': break;
1755 case 'o': break;
1756 case 'a': break;
1757 case 'x': show_pax = 1; break;
1758 case 'e': show_phdr = 1; break;
1759 case 't': show_textrel = 1; break;
1760 case 'r': show_rpath = 1; break;
1761 case 'n': show_needed = 1; break;
1762 case 'i': show_interp = 1; break;
1763 case 'b': show_bind = 1; break;
1764 case 'S': show_soname = 1; break;
1765 case 'T': show_textrels = 1; break;
1766 default:
1767 err("Invalid format specifier '%c' (byte %i)",
1768 out_format[i], i+1);
1769 }
1770 }
1771
1772 /* construct our default format */
1773 } else {
1774 size_t fmt_len = 30;
1775 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
1776 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1777 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1778 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1779 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1780 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1781 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1782 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1783 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1784 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1785 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1786 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1787 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1788 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1789 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1790 }
1791 if (be_verbose > 2) printf("Format: %s\n", out_format);
1792
1793 /* now lets actually do the scanning */
1794 if (scan_ldpath || use_ldcache)
1795 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
1796 if (scan_ldpath) scanelf_ldpath();
1797 if (scan_envpath) scanelf_envpath();
1798 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
1799 from_file = "-";
1800 if (from_file) {
1801 scanelf_from_file(from_file);
1802 from_file = *argv;
1803 }
1804 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1805 err("Nothing to scan !?");
1806 while (optind < argc) {
1807 search_path = argv[optind++];
1808 ret = scanelf_dir(search_path);
1809 }
1810
1811 /* clean up */
1812 free(versioned_symname);
1813 for (i = 0; ldpaths[i]; ++i)
1814 free(ldpaths[i]);
1815
1816 if (ldcache != 0)
1817 munmap(ldcache, ldcache_size);
1818 return ret;
1819 }
1820
1821 static char **get_split_env(const char *envvar)
1822 {
1823 const char *delims = " \t\n";
1824 char **envvals = NULL;
1825 char *env, *s;
1826 int nentry;
1827
1828 if ((env = getenv(envvar)) == NULL)
1829 return NULL;
1830
1831 env = xstrdup(env);
1832 if (env == NULL)
1833 return NULL;
1834
1835 s = strtok(env, delims);
1836 if (s == NULL) {
1837 free(env);
1838 return NULL;
1839 }
1840
1841 nentry = 0;
1842 while (s != NULL) {
1843 ++nentry;
1844 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
1845 envvals[nentry-1] = s;
1846 s = strtok(NULL, delims);
1847 }
1848 envvals[nentry] = NULL;
1849
1850 /* don't want to free(env) as it contains the memory that backs
1851 * the envvals array of strings */
1852 return envvals;
1853 }
1854 static void parseenv()
1855 {
1856 qa_textrels = get_split_env("QA_TEXTRELS");
1857 qa_execstack = get_split_env("QA_EXECSTACK");
1858 qa_wx_load = get_split_env("QA_WX_LOAD");
1859 }
1860
1861 #ifdef __PAX_UTILS_CLEANUP
1862 static void cleanup()
1863 {
1864 free(out_format);
1865 free(qa_textrels);
1866 free(qa_execstack);
1867 free(qa_wx_load);
1868 }
1869 #endif
1870
1871
1872 int main(int argc, char *argv[])
1873 {
1874 int ret;
1875 if (argc < 2)
1876 usage(EXIT_FAILURE);
1877 parseenv();
1878 ret = parseargs(argc, argv);
1879 fclose(stdout);
1880 #ifdef __PAX_UTILS_CLEANUP
1881 cleanup();
1882 warn("The calls to add/delete heap should be off:\n"
1883 "\t- 1 due to the out_buffer not being freed in scanelf_file()\n"
1884 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
1885 #endif
1886 return ret;
1887 }
1888
1889
1890
1891 /* utility funcs */
1892 static char *xstrdup(const char *s)
1893 {
1894 char *ret = strdup(s);
1895 if (!ret) err("Could not strdup(): %s", strerror(errno));
1896 return ret;
1897 }
1898 static void *xmalloc(size_t size)
1899 {
1900 void *ret = malloc(size);
1901 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1902 return ret;
1903 }
1904 static void *xrealloc(void *ptr, size_t size)
1905 {
1906 void *ret = realloc(ptr, size);
1907 if (!ret) err("Could not realloc() %li bytes", (unsigned long)size);
1908 return ret;
1909 }
1910 static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
1911 {
1912 size_t new_len;
1913
1914 new_len = strlen(*dst) + strlen(src);
1915 if (*curr_len <= new_len) {
1916 *curr_len = new_len + (*curr_len / 2);
1917 *dst = realloc(*dst, *curr_len);
1918 if (!*dst)
1919 err("could not realloc() %li bytes", (unsigned long)*curr_len);
1920 }
1921
1922 if (n)
1923 strncat(*dst, src, n);
1924 else
1925 strcat(*dst, src);
1926 }
1927 static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1928 {
1929 static char my_app[2];
1930 my_app[0] = append;
1931 my_app[1] = '\0';
1932 xstrcat(dst, my_app, curr_len);
1933 }
1934
1935 /* Match filename against entries in matchlist, return TRUE
1936 * if the file is listed */
1937 static int file_matches_list(const char *filename, char **matchlist)
1938 {
1939 char **file;
1940 char *match;
1941 char buf[__PAX_UTILS_PATH_MAX];
1942
1943 if (matchlist == NULL)
1944 return 0;
1945
1946 for (file = matchlist; *file != NULL; file++) {
1947 if (search_path) {
1948 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
1949 match = buf;
1950 } else {
1951 match = *file;
1952 }
1953 if (fnmatch(match, filename, 0) == 0)
1954 return 1;
1955 }
1956 return 0;
1957 }

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