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Revision 1.169 - (show annotations) (download) (as text)
Tue Jan 9 00:23:13 2007 UTC (7 years, 6 months ago) by vapier
Branch: MAIN
Changes since 1.168: +16 -8 lines
File MIME type: text/x-csrc
generally improve textrel output

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 1.168 2007/01/08 22:57:01 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 1.168 2007/01/08 22:57:01 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/data?)"); \
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 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
409 if (r_offset > EGET(func->st_size)) \
410 printf("(optimized out: previous %s)", func_name); \
411 else \
412 printf("%s", func_name); \
413 } else \
414 printf("(optimized out)"); \
415 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
416 if (be_verbose) { \
417 char *sysbuf; \
418 size_t syslen; \
419 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"; \
420 syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
421 sysbuf = xmalloc(syslen); \
422 if (sysbuf) { \
423 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
424 if (end_addr < r_offset) \
425 /* not uncommon when things are optimized out */ \
426 end_addr = r_offset + 0x100; \
427 snprintf(sysbuf, syslen, sysfmt, \
428 (unsigned long)offset_tmp, \
429 (unsigned long)end_addr, \
430 elf->filename, \
431 (unsigned long)r_offset); \
432 fflush(stdout); \
433 system(sysbuf); \
434 fflush(stdout); \
435 free(sysbuf); \
436 } \
437 } \
438 } \
439 } }
440 SHOW_TEXTRELS(32)
441 SHOW_TEXTRELS(64)
442 }
443 if (!*found_textrels)
444 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
445
446 return NULL;
447 }
448
449 static void rpath_security_checks(elfobj *, char *, const char *);
450 static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
451 {
452 struct stat st;
453 switch (*item) {
454 case '/': break;
455 case '.':
456 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
457 break;
458 case ':':
459 case '\0':
460 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
461 break;
462 case '$':
463 if (fstat(elf->fd, &st) != -1)
464 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
465 warnf("Security problem with %s='%s' in %s with mode set of %o",
466 dt_type, item, elf->filename, st.st_mode & 07777);
467 break;
468 default:
469 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
470 break;
471 }
472 }
473 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
474 {
475 unsigned long i, s;
476 char *rpath, *runpath, **r;
477 void *strtbl_void;
478
479 if (!show_rpath) return;
480
481 strtbl_void = elf_findsecbyname(elf, ".dynstr");
482 rpath = runpath = NULL;
483
484 if (elf->phdr && strtbl_void) {
485 #define SHOW_RPATH(B) \
486 if (elf->elf_class == ELFCLASS ## B) { \
487 Elf ## B ## _Dyn *dyn; \
488 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
489 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
490 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
491 Elf ## B ## _Off offset; \
492 Elf ## B ## _Xword word; \
493 /* Scan all the program headers */ \
494 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
495 /* Just scan dynamic headers */ \
496 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
497 offset = EGET(phdr[i].p_offset); \
498 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
499 /* Just scan dynamic RPATH/RUNPATH headers */ \
500 dyn = DYN ## B (elf->data + offset); \
501 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
502 if (word == DT_RPATH) { \
503 r = &rpath; \
504 } else if (word == DT_RUNPATH) { \
505 r = &runpath; \
506 } else { \
507 ++dyn; \
508 continue; \
509 } \
510 /* Verify the memory is somewhat sane */ \
511 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
512 if (offset < (Elf ## B ## _Off)elf->len) { \
513 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
514 *r = (char*)(elf->data + offset); \
515 /* cache the length in case we need to nuke this section later on */ \
516 if (fix_elf) \
517 offset = strlen(*r); \
518 /* If quiet, don't output paths in ld.so.conf */ \
519 if (be_quiet) { \
520 size_t len; \
521 char *start, *end; \
522 /* note that we only 'chop' off leading known paths. */ \
523 /* since *r is read-only memory, we can only move the ptr forward. */ \
524 start = *r; \
525 /* scan each path in : delimited list */ \
526 while (start) { \
527 rpath_security_checks(elf, start, get_elfdtype(word)); \
528 end = strchr(start, ':'); \
529 len = (end ? abs(end - start) : strlen(start)); \
530 if (use_ldcache) \
531 for (s = 0; ldpaths[s]; ++s) \
532 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
533 *r = end; \
534 /* corner case ... if RPATH reads "/usr/lib:", we want \
535 * to show ':' rather than '' */ \
536 if (end && end[1] != '\0') \
537 (*r)++; \
538 break; \
539 } \
540 if (!*r || !end) \
541 break; \
542 else \
543 start = start + len + 1; \
544 } \
545 } \
546 if (*r) { \
547 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
548 /* just nuke it */ \
549 nuke_it##B: \
550 memset(*r, 0x00, offset); \
551 *r = NULL; \
552 ESET(dyn->d_tag, DT_DEBUG); \
553 ESET(dyn->d_un.d_ptr, 0); \
554 } else if (fix_elf) { \
555 /* try to clean "bad" paths */ \
556 size_t len, tmpdir_len; \
557 char *start, *end; \
558 const char *tmpdir; \
559 start = *r; \
560 tmpdir = (getenv("TMPDIR") ? : "."); \
561 tmpdir_len = strlen(tmpdir); \
562 while (1) { \
563 end = strchr(start, ':'); \
564 if (start == end) { \
565 eat_this_path##B: \
566 len = strlen(end); \
567 memmove(start, end+1, len); \
568 start[len-1] = '\0'; \
569 end = start - 1; \
570 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
571 if (!end) { \
572 if (start == *r) \
573 goto nuke_it##B; \
574 *--start = '\0'; \
575 } else \
576 goto eat_this_path##B; \
577 } \
578 if (!end) \
579 break; \
580 start = end + 1; \
581 } \
582 if (**r == '\0') \
583 goto nuke_it##B; \
584 } \
585 if (*r) \
586 *found_rpath = 1; \
587 } \
588 } \
589 ++dyn; \
590 } \
591 } }
592 SHOW_RPATH(32)
593 SHOW_RPATH(64)
594 }
595
596 if (be_wewy_wewy_quiet) return;
597
598 if (rpath && runpath) {
599 if (!strcmp(rpath, runpath)) {
600 xstrcat(ret, runpath, ret_len);
601 } else {
602 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
603 xchrcat(ret, '{', ret_len);
604 xstrcat(ret, rpath, ret_len);
605 xchrcat(ret, ',', ret_len);
606 xstrcat(ret, runpath, ret_len);
607 xchrcat(ret, '}', ret_len);
608 }
609 } else if (rpath || runpath)
610 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
611 else if (!be_quiet)
612 xstrcat(ret, " - ", ret_len);
613 }
614
615 #define LDSO_CACHE_MAGIC "ld.so-"
616 #define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
617 #define LDSO_CACHE_VER "1.7.0"
618 #define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
619 #define FLAG_ANY -1
620 #define FLAG_TYPE_MASK 0x00ff
621 #define FLAG_LIBC4 0x0000
622 #define FLAG_ELF 0x0001
623 #define FLAG_ELF_LIBC5 0x0002
624 #define FLAG_ELF_LIBC6 0x0003
625 #define FLAG_REQUIRED_MASK 0xff00
626 #define FLAG_SPARC_LIB64 0x0100
627 #define FLAG_IA64_LIB64 0x0200
628 #define FLAG_X8664_LIB64 0x0300
629 #define FLAG_S390_LIB64 0x0400
630 #define FLAG_POWERPC_LIB64 0x0500
631 #define FLAG_MIPS64_LIBN32 0x0600
632 #define FLAG_MIPS64_LIBN64 0x0700
633
634 static char *lookup_cache_lib(elfobj *, char *);
635
636 #if defined(__GLIBC__) || defined(__UCLIBC__)
637
638 static char *lookup_cache_lib(elfobj *elf, char *fname)
639 {
640 int fd = 0;
641 char *strs;
642 static char buf[__PAX_UTILS_PATH_MAX] = "";
643 const char *cachefile = "/etc/ld.so.cache";
644 struct stat st;
645
646 typedef struct {
647 char magic[LDSO_CACHE_MAGIC_LEN];
648 char version[LDSO_CACHE_VER_LEN];
649 int nlibs;
650 } header_t;
651 header_t *header;
652
653 typedef struct {
654 int flags;
655 int sooffset;
656 int liboffset;
657 } libentry_t;
658 libentry_t *libent;
659
660 if (fname == NULL)
661 return NULL;
662
663 if (ldcache == 0) {
664 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1)
665 return NULL;
666
667 /* cache these values so we only map/unmap the cache file once */
668 ldcache_size = st.st_size;
669 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
670
671 close(fd);
672
673 if (ldcache == (caddr_t)-1) {
674 ldcache = 0;
675 return NULL;
676 }
677
678 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
679 return NULL;
680 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
681 return NULL;
682 }
683
684 header = (header_t *) ldcache;
685 libent = (libentry_t *) (ldcache + sizeof(header_t));
686 strs = (char *) &libent[header->nlibs];
687
688 for (fd = 0; fd < header->nlibs; fd++) {
689 /* this should be more fine grained, but for now we assume that
690 * diff arches will not be cached together. and we ignore the
691 * the different multilib mips cases. */
692 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
693 continue;
694 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
695 continue;
696
697 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
698 continue;
699 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
700 }
701 return buf;
702 }
703 #elif defined(__NetBSD__)
704 static char *lookup_cache_lib(elfobj *elf, char *fname)
705 {
706 static char buf[__PAX_UTILS_PATH_MAX] = "";
707 static struct stat st;
708
709 char **ldpath;
710 for (ldpath = ldpaths; *ldpath != NULL; ldpath++) {
711 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", *ldpath, fname) >= sizeof(buf))
712 continue; /* if the pathname is too long, or something went wrong, ignore */
713
714 if (stat(buf, &st) != 0)
715 continue; /* if the lib doesn't exist in *ldpath, look further */
716
717 /* NetBSD doesn't actually do sanity checks, it just loads the file
718 * and if that doesn't work, continues looking in other directories.
719 * This cannot easily be safely emulated, unfortunately. For now,
720 * just assume that if it exists, it's a valid library. */
721
722 return buf;
723 }
724
725 /* not found in any path */
726 return NULL;
727 }
728 #else
729 #warning Cache support not implemented for your target
730 static char *lookup_cache_lib(elfobj *elf, char *fname)
731 {
732 return NULL;
733 }
734 #endif
735
736 static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
737 {
738 unsigned long i;
739 char *needed;
740 void *strtbl_void;
741 char *p;
742
743 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
744
745 strtbl_void = elf_findsecbyname(elf, ".dynstr");
746
747 if (elf->phdr && strtbl_void) {
748 #define SHOW_NEEDED(B) \
749 if (elf->elf_class == ELFCLASS ## B) { \
750 Elf ## B ## _Dyn *dyn; \
751 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
752 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
753 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
754 Elf ## B ## _Off offset; \
755 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
756 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
757 offset = EGET(phdr[i].p_offset); \
758 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
759 dyn = DYN ## B (elf->data + offset); \
760 while (EGET(dyn->d_tag) != DT_NULL) { \
761 if (EGET(dyn->d_tag) == DT_NEEDED) { \
762 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
763 if (offset >= (Elf ## B ## _Off)elf->len) { \
764 ++dyn; \
765 continue; \
766 } \
767 needed = (char*)(elf->data + offset); \
768 if (op == 0) { \
769 if (!be_wewy_wewy_quiet) { \
770 if (*found_needed) xchrcat(ret, ',', ret_len); \
771 if (use_ldcache) \
772 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
773 needed = p; \
774 xstrcat(ret, needed, ret_len); \
775 } \
776 *found_needed = 1; \
777 } else { \
778 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \
779 *found_lib = 1; \
780 return (be_wewy_wewy_quiet ? NULL : needed); \
781 } \
782 } \
783 } \
784 ++dyn; \
785 } \
786 } }
787 SHOW_NEEDED(32)
788 SHOW_NEEDED(64)
789 if (op == 0 && !*found_needed && be_verbose)
790 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
791 }
792
793 return NULL;
794 }
795 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
796 {
797 void *strtbl_void;
798
799 if (!show_interp) return NULL;
800
801 strtbl_void = elf_findsecbyname(elf, ".interp");
802
803 if (strtbl_void) {
804 #define SHOW_INTERP(B) \
805 if (elf->elf_class == ELFCLASS ## B) { \
806 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
807 *found_interp = 1; \
808 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
809 }
810 SHOW_INTERP(32)
811 SHOW_INTERP(64)
812 }
813 return NULL;
814 }
815 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
816 {
817 unsigned long i;
818 struct stat s;
819 char dynamic = 0;
820
821 if (!show_bind) return NULL;
822 if (!elf->phdr) return NULL;
823
824 #define SHOW_BIND(B) \
825 if (elf->elf_class == ELFCLASS ## B) { \
826 Elf ## B ## _Dyn *dyn; \
827 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
828 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
829 Elf ## B ## _Off offset; \
830 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
831 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
832 dynamic = 1; \
833 offset = EGET(phdr[i].p_offset); \
834 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
835 dyn = DYN ## B (elf->data + offset); \
836 while (EGET(dyn->d_tag) != DT_NULL) { \
837 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
838 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
839 { \
840 if (be_quiet) return NULL; \
841 *found_bind = 1; \
842 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
843 } \
844 ++dyn; \
845 } \
846 } \
847 }
848 SHOW_BIND(32)
849 SHOW_BIND(64)
850
851 if (be_wewy_wewy_quiet) return NULL;
852
853 /* don't output anything if quiet mode and the ELF is static or not setuid */
854 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
855 return NULL;
856 } else {
857 *found_bind = 1;
858 return (char *) (dynamic ? "LAZY" : "STATIC");
859 }
860 }
861 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
862 {
863 unsigned long i;
864 char *soname;
865 void *strtbl_void;
866
867 if (!show_soname) return NULL;
868
869 strtbl_void = elf_findsecbyname(elf, ".dynstr");
870
871 if (elf->phdr && strtbl_void) {
872 #define SHOW_SONAME(B) \
873 if (elf->elf_class == ELFCLASS ## B) { \
874 Elf ## B ## _Dyn *dyn; \
875 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
876 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
877 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
878 Elf ## B ## _Off offset; \
879 /* only look for soname in shared objects */ \
880 if (ehdr->e_type != ET_DYN) \
881 return NULL; \
882 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
883 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
884 offset = EGET(phdr[i].p_offset); \
885 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
886 dyn = DYN ## B (elf->data + offset); \
887 while (EGET(dyn->d_tag) != DT_NULL) { \
888 if (EGET(dyn->d_tag) == DT_SONAME) { \
889 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
890 if (offset >= (Elf ## B ## _Off)elf->len) { \
891 ++dyn; \
892 continue; \
893 } \
894 soname = (char*)(elf->data + offset); \
895 *found_soname = 1; \
896 return (be_wewy_wewy_quiet ? NULL : soname); \
897 } \
898 ++dyn; \
899 } \
900 } }
901 SHOW_SONAME(32)
902 SHOW_SONAME(64)
903 }
904
905 return NULL;
906 }
907 static char *scanelf_file_sym(elfobj *elf, char *found_sym)
908 {
909 unsigned long i;
910 char *ret;
911 void *symtab_void, *strtab_void;
912
913 if (!find_sym) return NULL;
914 ret = find_sym;
915
916 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
917
918 if (symtab_void && strtab_void) {
919 #define FIND_SYM(B) \
920 if (elf->elf_class == ELFCLASS ## B) { \
921 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
922 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
923 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
924 unsigned long cnt = EGET(symtab->sh_entsize); \
925 char *symname; \
926 if (cnt) \
927 cnt = EGET(symtab->sh_size) / cnt; \
928 for (i = 0; i < cnt; ++i) { \
929 if (sym->st_name) { \
930 /* make sure the symbol name is in acceptable memory range */ \
931 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
932 if ((void*)symname > (void*)elf->data_end) { \
933 warnf("%s: corrupt ELF symbols", elf->filename); \
934 ++sym; \
935 continue; \
936 } \
937 /* debug display ... show all symbols and some extra info */ \
938 if (*ret == '*') { \
939 printf("%s(%s) %5lX %15s %s\n", \
940 ((*found_sym == 0) ? "\n\t" : "\t"), \
941 elf->base_filename, \
942 (unsigned long)sym->st_size, \
943 get_elfstttype(sym->st_info), \
944 symname); \
945 *found_sym = 1; \
946 } else { \
947 /* allow the user to specify a comma delimited list of symbols to search for */ \
948 char *this_sym, *this_sym_ver, *next_sym; \
949 this_sym = ret; \
950 this_sym_ver = versioned_symname; \
951 do { \
952 next_sym = strchr(this_sym, ','); \
953 if (next_sym == NULL) \
954 next_sym = this_sym + strlen(this_sym); \
955 /* do we want a defined symbol ? */ \
956 if (*this_sym == '+') { \
957 if (sym->st_shndx == SHN_UNDEF) \
958 goto skip_this_sym##B; \
959 ++this_sym; \
960 ++this_sym_ver; \
961 /* do we want an undefined symbol ? */ \
962 } else if (*this_sym == '-') { \
963 if (sym->st_shndx != SHN_UNDEF) \
964 goto skip_this_sym##B; \
965 ++this_sym; \
966 ++this_sym_ver; \
967 } \
968 /* ok, lets compare the name now */ \
969 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
970 (strncmp(this_sym_ver, symname, strlen(this_sym_ver)) == 0)) { \
971 if (be_semi_verbose) { \
972 char buf[126]; \
973 snprintf(buf, sizeof(buf), "%lX %s %s", \
974 (unsigned long)sym->st_size, get_elfstttype(sym->st_info), this_sym); \
975 ret = buf; \
976 } else \
977 ret = this_sym; \
978 (*found_sym)++; \
979 goto break_out; \
980 } \
981 skip_this_sym##B: this_sym = next_sym + 1; \
982 } while (*next_sym != '\0'); \
983 } \
984 } \
985 ++sym; \
986 } }
987 FIND_SYM(32)
988 FIND_SYM(64)
989 }
990
991 break_out:
992 if (be_wewy_wewy_quiet) return NULL;
993
994 if (*find_sym != '*' && *found_sym)
995 return ret;
996 if (be_quiet)
997 return NULL;
998 else
999 return (char *)" - ";
1000 }
1001
1002
1003 static char *scanelf_file_sections(elfobj *elf, char *found_section)
1004 {
1005 if (!find_section)
1006 return NULL;
1007
1008 #define FIND_SECTION(B) \
1009 if (elf->elf_class == ELFCLASS ## B) { \
1010 int invert; \
1011 Elf ## B ## _Shdr *section; \
1012 invert = (*find_section == '!' ? 1 : 0); \
1013 section = SHDR ## B (elf_findsecbyname(elf, find_section+invert)); \
1014 if ((section == NULL && invert) || (section != NULL && !invert)) \
1015 *found_section = 1; \
1016 }
1017 FIND_SECTION(32)
1018 FIND_SECTION(64)
1019
1020 if (be_wewy_wewy_quiet)
1021 return NULL;
1022
1023 if (*found_section)
1024 return find_section;
1025
1026 if (be_quiet)
1027 return NULL;
1028 else
1029 return (char *)" - ";
1030 }
1031
1032 /* scan an elf file and show all the fun stuff */
1033 #define prints(str) write(fileno(stdout), str, strlen(str))
1034 static int scanelf_elfobj(elfobj *elf)
1035 {
1036 unsigned long i;
1037 char found_pax, found_phdr, found_relro, found_load, found_textrel,
1038 found_rpath, found_needed, found_interp, found_bind, found_soname,
1039 found_sym, found_lib, found_file, found_textrels, found_section;
1040 static char *out_buffer = NULL;
1041 static size_t out_len;
1042
1043 found_pax = found_phdr = found_relro = found_load = found_textrel = \
1044 found_rpath = found_needed = found_interp = found_bind = found_soname = \
1045 found_sym = found_lib = found_file = found_textrels = found_section = 0;
1046
1047 if (be_verbose > 2)
1048 printf("%s: scanning file {%s,%s}\n", elf->filename,
1049 get_elfeitype(EI_CLASS, elf->elf_class),
1050 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
1051 else if (be_verbose > 1)
1052 printf("%s: scanning file\n", elf->filename);
1053
1054 /* init output buffer */
1055 if (!out_buffer) {
1056 out_len = sizeof(char) * 80;
1057 out_buffer = (char*)xmalloc(out_len);
1058 }
1059 *out_buffer = '\0';
1060
1061 /* show the header */
1062 if (!be_quiet && show_banner) {
1063 for (i = 0; out_format[i]; ++i) {
1064 if (!IS_MODIFIER(out_format[i])) continue;
1065
1066 switch (out_format[++i]) {
1067 case '+': break;
1068 case '%': break;
1069 case '#': break;
1070 case 'F':
1071 case 'p':
1072 case 'f': prints("FILE "); found_file = 1; break;
1073 case 'o': prints(" TYPE "); break;
1074 case 'x': prints(" PAX "); break;
1075 case 'e': prints("STK/REL/PTL "); break;
1076 case 't': prints("TEXTREL "); break;
1077 case 'r': prints("RPATH "); break;
1078 case 'n': prints("NEEDED "); break;
1079 case 'i': prints("INTERP "); break;
1080 case 'b': prints("BIND "); break;
1081 case 'S': prints("SONAME "); break;
1082 case 's': prints("SYM "); break;
1083 case 'N': prints("LIB "); break;
1084 case 'T': prints("TEXTRELS "); break;
1085 case 'k': prints("SECTION "); break;
1086 case 'a': prints("ARCH "); break;
1087 default: warnf("'%c' has no title ?", out_format[i]);
1088 }
1089 }
1090 if (!found_file) prints("FILE ");
1091 prints("\n");
1092 found_file = 0;
1093 show_banner = 0;
1094 }
1095
1096 /* dump all the good stuff */
1097 for (i = 0; out_format[i]; ++i) {
1098 const char *out;
1099 const char *tmp;
1100
1101 if (!IS_MODIFIER(out_format[i])) {
1102 xchrcat(&out_buffer, out_format[i], &out_len);
1103 continue;
1104 }
1105
1106 out = NULL;
1107 be_wewy_wewy_quiet = (out_format[i] == '#');
1108 be_semi_verbose = (out_format[i] == '+');
1109 switch (out_format[++i]) {
1110 case '+':
1111 case '%':
1112 case '#':
1113 xchrcat(&out_buffer, out_format[i], &out_len); break;
1114 case 'F':
1115 found_file = 1;
1116 if (be_wewy_wewy_quiet) break;
1117 xstrcat(&out_buffer, elf->filename, &out_len);
1118 break;
1119 case 'p':
1120 found_file = 1;
1121 if (be_wewy_wewy_quiet) break;
1122 tmp = elf->filename;
1123 if (search_path) {
1124 ssize_t len_search = strlen(search_path);
1125 ssize_t len_file = strlen(elf->filename);
1126 if (!strncmp(elf->filename, search_path, len_search) && \
1127 len_file > len_search)
1128 tmp += len_search;
1129 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1130 }
1131 xstrcat(&out_buffer, tmp, &out_len);
1132 break;
1133 case 'f':
1134 found_file = 1;
1135 if (be_wewy_wewy_quiet) break;
1136 tmp = strrchr(elf->filename, '/');
1137 tmp = (tmp == NULL ? elf->filename : tmp+1);
1138 xstrcat(&out_buffer, tmp, &out_len);
1139 break;
1140 case 'o': out = get_elfetype(elf); break;
1141 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
1142 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
1143 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1144 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
1145 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1146 case 'n':
1147 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
1148 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1149 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1150 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
1151 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1152 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1153 case 'a': out = get_elfemtype(elf); break;
1154 default: warnf("'%c' has no scan code?", out_format[i]);
1155 }
1156 if (out) {
1157 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
1158 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
1159 xstrncat(&out_buffer, out, &out_len, (tmp-out));
1160 else
1161 xstrcat(&out_buffer, out, &out_len);
1162 }
1163 }
1164
1165 #define FOUND_SOMETHING() \
1166 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1167 found_rpath || found_needed || found_interp || found_bind || \
1168 found_soname || found_sym || found_lib || found_textrels || found_section )
1169
1170 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1171 xchrcat(&out_buffer, ' ', &out_len);
1172 xstrcat(&out_buffer, elf->filename, &out_len);
1173 }
1174 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
1175 puts(out_buffer);
1176 fflush(stdout);
1177 }
1178
1179 return 0;
1180 }
1181
1182 /* scan a single elf */
1183 static int scanelf_elf(const char *filename, int fd, size_t len)
1184 {
1185 int ret = 1;
1186 elfobj *elf;
1187
1188 /* verify this is real ELF */
1189 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1190 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1191 return ret;
1192 }
1193 switch (match_bits) {
1194 case 32:
1195 if (elf->elf_class != ELFCLASS32)
1196 goto label_done;
1197 break;
1198 case 64:
1199 if (elf->elf_class != ELFCLASS64)
1200 goto label_done;
1201 break;
1202 default: break;
1203 }
1204 if (strlen(match_etypes)) {
1205 char sbuf[126];
1206 strncpy(sbuf, match_etypes, sizeof(sbuf));
1207 if (strchr(match_etypes, ',') != NULL) {
1208 char *p;
1209 while((p = strrchr(sbuf, ',')) != NULL) {
1210 *p = 0;
1211 if (etype_lookup(p+1) == get_etype(elf))
1212 goto label_ret;
1213 }
1214 }
1215 if (etype_lookup(sbuf) != get_etype(elf))
1216 goto label_done;
1217 }
1218
1219 label_ret:
1220 ret = scanelf_elfobj(elf);
1221
1222 label_done:
1223 unreadelf(elf);
1224 return ret;
1225 }
1226
1227 /* scan an archive of elfs */
1228 static int scanelf_archive(const char *filename, int fd, size_t len)
1229 {
1230 archive_handle *ar;
1231 archive_member *m;
1232 char *ar_buffer;
1233 elfobj *elf;
1234
1235 ar = ar_open_fd(filename, fd);
1236 if (ar == NULL)
1237 return 1;
1238
1239 ar_buffer = (char*)mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1240 while ((m=ar_next(ar)) != NULL) {
1241 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size);
1242 if (elf) {
1243 scanelf_elfobj(elf);
1244 unreadelf(elf);
1245 }
1246 }
1247 munmap(ar_buffer, len);
1248
1249 return 0;
1250 }
1251 /* scan a file which may be an elf or an archive or some other magical beast */
1252 static int scanelf_file(const char *filename, const struct stat *st_cache)
1253 {
1254 const struct stat *st = st_cache;
1255 struct stat symlink_st;
1256 int fd;
1257
1258 /* always handle regular files and handle symlinked files if no -y */
1259 if (S_ISLNK(st->st_mode)) {
1260 if (!scan_symlink) return 1;
1261 stat(filename, &symlink_st);
1262 st = &symlink_st;
1263 }
1264
1265 if (!S_ISREG(st->st_mode)) {
1266 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1267 return 1;
1268 }
1269
1270 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1271 return 1;
1272
1273 if (scanelf_elf(filename, fd, st->st_size) == 1 && scan_archives)
1274 /* if it isn't an ELF, maybe it's an .a archive */
1275 scanelf_archive(filename, fd, st->st_size);
1276
1277 close(fd);
1278 return 0;
1279 }
1280
1281 /* scan a directory for ET_EXEC files and print when we find one */
1282 static int scanelf_dir(const char *path)
1283 {
1284 register DIR *dir;
1285 register struct dirent *dentry;
1286 struct stat st_top, st;
1287 char buf[__PAX_UTILS_PATH_MAX];
1288 size_t pathlen = 0, len = 0;
1289 int ret = 0;
1290
1291 /* make sure path exists */
1292 if (lstat(path, &st_top) == -1) {
1293 if (be_verbose > 2) printf("%s: does not exist\n", path);
1294 return 1;
1295 }
1296
1297 /* ok, if it isn't a directory, assume we can open it */
1298 if (!S_ISDIR(st_top.st_mode)) {
1299 return scanelf_file(path, &st_top);
1300 }
1301
1302 /* now scan the dir looking for fun stuff */
1303 if ((dir = opendir(path)) == NULL) {
1304 warnf("could not opendir %s: %s", path, strerror(errno));
1305 return 1;
1306 }
1307 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1308
1309 pathlen = strlen(path);
1310 while ((dentry = readdir(dir))) {
1311 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1312 continue;
1313 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
1314 if (len >= sizeof(buf)) {
1315 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1316 (unsigned long)len, (unsigned long)sizeof(buf));
1317 continue;
1318 }
1319 snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name);
1320 if (lstat(buf, &st) != -1) {
1321 if (S_ISREG(st.st_mode))
1322 ret = scanelf_file(buf, &st);
1323 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1324 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1325 ret = scanelf_dir(buf);
1326 }
1327 }
1328 }
1329 closedir(dir);
1330 return ret;
1331 }
1332
1333 static int scanelf_from_file(const char *filename)
1334 {
1335 FILE *fp = NULL;
1336 char *p;
1337 char path[__PAX_UTILS_PATH_MAX];
1338 int ret = 0;
1339
1340 if (strcmp(filename, "-") == 0)
1341 fp = stdin;
1342 else if ((fp = fopen(filename, "r")) == NULL)
1343 return 1;
1344
1345 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1346 if ((p = strchr(path, '\n')) != NULL)
1347 *p = 0;
1348 search_path = path;
1349 ret = scanelf_dir(path);
1350 }
1351 if (fp != stdin)
1352 fclose(fp);
1353 return ret;
1354 }
1355
1356 #if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1357
1358 static int load_ld_cache_config(int i, const char *fname)
1359 {
1360 FILE *fp = NULL;
1361 char *p;
1362 char path[__PAX_UTILS_PATH_MAX];
1363
1364 if (i + 1 == ARRAY_SIZE(ldpaths))
1365 return i;
1366
1367 if ((fp = fopen(fname, "r")) == NULL)
1368 return i;
1369
1370 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1371 if ((p = strrchr(path, '\r')) != NULL)
1372 *p = 0;
1373 if ((p = strchr(path, '\n')) != NULL)
1374 *p = 0;
1375 #ifdef __linux__
1376 // recursive includes of the same file will make this segfault.
1377 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1378 glob64_t gl;
1379 size_t x;
1380 char gpath[__PAX_UTILS_PATH_MAX];
1381
1382 memset(gpath, 0, sizeof(gpath));
1383
1384 if (path[8] != '/')
1385 snprintf(gpath, sizeof(gpath), "/etc/%s", &path[8]);
1386 else
1387 strncpy(gpath, &path[8], sizeof(gpath));
1388
1389 if ((glob64(gpath, 0, NULL, &gl)) == 0) {
1390 for (x = 0; x < gl.gl_pathc; ++x) {
1391 /* try to avoid direct loops */
1392 if (strcmp(gl.gl_pathv[x], fname) == 0)
1393 continue;
1394 i = load_ld_cache_config(i, gl.gl_pathv[x]);
1395 if (i + 1 >= ARRAY_SIZE(ldpaths)) {
1396 globfree64(&gl);
1397 return i;
1398 }
1399 }
1400 globfree64 (&gl);
1401 continue;
1402 }
1403 }
1404 #endif
1405 if (*path != '/')
1406 continue;
1407
1408 ldpaths[i++] = xstrdup(path);
1409
1410 if (i + 1 == ARRAY_SIZE(ldpaths))
1411 break;
1412 }
1413 ldpaths[i] = NULL;
1414
1415 fclose(fp);
1416 return i;
1417 }
1418
1419 #elif defined(__FreeBSD__) || (__DragonFly__)
1420
1421 static int load_ld_cache_config(int i, const char *fname)
1422 {
1423 FILE *fp = NULL;
1424 char *b = NULL, *p;
1425 struct elfhints_hdr hdr;
1426
1427 if (i + 1 == ARRAY_SIZE(ldpaths))
1428 return i;
1429
1430 if ((fp = fopen(fname, "r")) == NULL)
1431 return i;
1432
1433 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1434 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1435 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1436 {
1437 fclose(fp);
1438 return i;
1439 }
1440
1441 b = (char*)malloc(hdr.dirlistlen+1);
1442 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1443 fclose(fp);
1444 free(b);
1445 return i;
1446 }
1447
1448 while ((p = strsep(&b, ":"))) {
1449 if (*p == '\0') continue;
1450 ldpaths[i++] = xstrdup(p);
1451
1452 if (i + 1 == ARRAY_SIZE(ldpaths))
1453 break;
1454 }
1455 ldpaths[i] = NULL;
1456
1457 free(b);
1458 fclose(fp);
1459 return i;
1460 }
1461
1462 #else
1463
1464 #warning Cache config support not implemented for your target
1465 static int load_ld_cache_config(int i, const char *fname)
1466 {
1467 memset(ldpaths, 0x00, sizeof(ldpaths));
1468 }
1469
1470 #endif
1471
1472 /* scan /etc/ld.so.conf for paths */
1473 static void scanelf_ldpath()
1474 {
1475 char scan_l, scan_ul, scan_ull;
1476 int i = 0;
1477
1478 if (!ldpaths[0])
1479 err("Unable to load any paths from ld.so.conf");
1480
1481 scan_l = scan_ul = scan_ull = 0;
1482
1483 while (ldpaths[i]) {
1484 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
1485 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
1486 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
1487 scanelf_dir(ldpaths[i]);
1488 ++i;
1489 }
1490
1491 if (!scan_l) scanelf_dir("/lib");
1492 if (!scan_ul) scanelf_dir("/usr/lib");
1493 if (!scan_ull) scanelf_dir("/usr/local/lib");
1494 }
1495
1496 /* scan env PATH for paths */
1497 static void scanelf_envpath()
1498 {
1499 char *path, *p;
1500
1501 path = getenv("PATH");
1502 if (!path)
1503 err("PATH is not set in your env !");
1504 path = xstrdup(path);
1505
1506 while ((p = strrchr(path, ':')) != NULL) {
1507 scanelf_dir(p + 1);
1508 *p = 0;
1509 }
1510
1511 free(path);
1512 }
1513
1514 /* usage / invocation handling functions */
1515 #define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:BhV"
1516 #define a_argument required_argument
1517 static struct option const long_opts[] = {
1518 {"path", no_argument, NULL, 'p'},
1519 {"ldpath", no_argument, NULL, 'l'},
1520 {"recursive", no_argument, NULL, 'R'},
1521 {"mount", no_argument, NULL, 'm'},
1522 {"symlink", no_argument, NULL, 'y'},
1523 {"archives", no_argument, NULL, 'A'},
1524 {"ldcache", no_argument, NULL, 'L'},
1525 {"fix", no_argument, NULL, 'X'},
1526 {"setpax", a_argument, NULL, 'z'},
1527 {"pax", no_argument, NULL, 'x'},
1528 {"header", no_argument, NULL, 'e'},
1529 {"textrel", no_argument, NULL, 't'},
1530 {"rpath", no_argument, NULL, 'r'},
1531 {"needed", no_argument, NULL, 'n'},
1532 {"interp", no_argument, NULL, 'i'},
1533 {"bind", no_argument, NULL, 'b'},
1534 {"soname", no_argument, NULL, 'S'},
1535 {"symbol", a_argument, NULL, 's'},
1536 {"section", a_argument, NULL, 'k'},
1537 {"lib", a_argument, NULL, 'N'},
1538 {"gmatch", no_argument, NULL, 'g'},
1539 {"textrels", no_argument, NULL, 'T'},
1540 {"etype", a_argument, NULL, 'E'},
1541 {"bits", a_argument, NULL, 'M'},
1542 {"all", no_argument, NULL, 'a'},
1543 {"quiet", no_argument, NULL, 'q'},
1544 {"verbose", no_argument, NULL, 'v'},
1545 {"format", a_argument, NULL, 'F'},
1546 {"from", a_argument, NULL, 'f'},
1547 {"file", a_argument, NULL, 'o'},
1548 {"nobanner", no_argument, NULL, 'B'},
1549 {"help", no_argument, NULL, 'h'},
1550 {"version", no_argument, NULL, 'V'},
1551 {NULL, no_argument, NULL, 0x0}
1552 };
1553
1554 static const char *opts_help[] = {
1555 "Scan all directories in PATH environment",
1556 "Scan all directories in /etc/ld.so.conf",
1557 "Scan directories recursively",
1558 "Don't recursively cross mount points",
1559 "Don't scan symlinks",
1560 "Scan archives (.a files)",
1561 "Utilize ld.so.cache information (use with -r/-n)",
1562 "Try and 'fix' bad things (use with -r/-e)",
1563 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1564 "Print PaX markings",
1565 "Print GNU_STACK/PT_LOAD markings",
1566 "Print TEXTREL information",
1567 "Print RPATH information",
1568 "Print NEEDED information",
1569 "Print INTERP information",
1570 "Print BIND information",
1571 "Print SONAME information",
1572 "Find a specified symbol",
1573 "Find a specified section",
1574 "Find a specified library",
1575 "Use strncmp to match libraries. (use with -N)",
1576 "Locate cause of TEXTREL",
1577 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1578 "Print only ELF files matching numeric bits",
1579 "Print all scanned info (-x -e -t -r -b)\n",
1580 "Only output 'bad' things",
1581 "Be verbose (can be specified more than once)",
1582 "Use specified format for output",
1583 "Read input stream from a filename",
1584 "Write output stream to a filename",
1585 "Don't display the header",
1586 "Print this help and exit",
1587 "Print version and exit",
1588 NULL
1589 };
1590
1591 /* display usage and exit */
1592 static void usage(int status)
1593 {
1594 unsigned long i;
1595 printf("* Scan ELF binaries for stuff\n\n"
1596 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1597 printf("Options: -[%s]\n", PARSE_FLAGS);
1598 for (i = 0; long_opts[i].name; ++i)
1599 if (long_opts[i].has_arg == no_argument)
1600 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
1601 long_opts[i].name, opts_help[i]);
1602 else
1603 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
1604 long_opts[i].name, opts_help[i]);
1605
1606 if (status != EXIT_SUCCESS)
1607 exit(status);
1608
1609 puts("\nThe format modifiers for the -F option are:");
1610 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1611 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1612 puts(" i INTERP \tb BIND \ts symbol");
1613 puts(" N library \to Type \tT TEXTRELs");
1614 puts(" S SONAME \tk section \ta arch");
1615 puts(" p filename (with search path removed)");
1616 puts(" f filename (short name/basename)");
1617 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1618
1619 puts("\nELF Etypes:");
1620 print_etypes(stdout);
1621
1622 exit(status);
1623 }
1624
1625 /* parse command line arguments and preform needed actions */
1626 #define do_pax_state(option, flag) \
1627 if (islower(option)) { \
1628 flags &= ~PF_##flag; \
1629 flags |= PF_NO##flag; \
1630 } else { \
1631 flags &= ~PF_NO##flag; \
1632 flags |= PF_##flag; \
1633 }
1634 static int parseargs(int argc, char *argv[])
1635 {
1636 int i;
1637 const char *from_file = NULL;
1638 int ret = 0;
1639
1640 opterr = 0;
1641 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1642 switch (i) {
1643
1644 case 'V':
1645 printf("pax-utils-%s: %s compiled %s\n%s\n"
1646 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
1647 VERSION, __FILE__, __DATE__, rcsid, argv0);
1648 exit(EXIT_SUCCESS);
1649 break;
1650 case 'h': usage(EXIT_SUCCESS); break;
1651 case 'f':
1652 if (from_file) warn("You prob don't want to specify -f twice");
1653 from_file = optarg;
1654 break;
1655 case 'E':
1656 strncpy(match_etypes, optarg, sizeof(match_etypes));
1657 break;
1658 case 'M':
1659 match_bits = atoi(optarg);
1660 break;
1661 case 'o': {
1662 if (freopen(optarg, "w", stdout) == NULL)
1663 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1664 break;
1665 }
1666 case 'k':
1667 if (find_section) warn("You prob don't want to specify -k twice");
1668 find_section = optarg;
1669 break;
1670 case 's': {
1671 if (find_sym) warn("You prob don't want to specify -s twice");
1672 find_sym = optarg;
1673 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1674 sprintf(versioned_symname, "%s@", find_sym);
1675 break;
1676 }
1677 case 'N': {
1678 if (find_lib) warn("You prob don't want to specify -N twice");
1679 find_lib = optarg;
1680 break;
1681 }
1682
1683 case 'F': {
1684 if (out_format) warn("You prob don't want to specify -F twice");
1685 out_format = optarg;
1686 break;
1687 }
1688 case 'z': {
1689 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1690 size_t x;
1691
1692 for (x = 0 ; x < strlen(optarg); x++) {
1693 switch(optarg[x]) {
1694 case 'p':
1695 case 'P':
1696 do_pax_state(optarg[x], PAGEEXEC);
1697 break;
1698 case 's':
1699 case 'S':
1700 do_pax_state(optarg[x], SEGMEXEC);
1701 break;
1702 case 'm':
1703 case 'M':
1704 do_pax_state(optarg[x], MPROTECT);
1705 break;
1706 case 'e':
1707 case 'E':
1708 do_pax_state(optarg[x], EMUTRAMP);
1709 break;
1710 case 'r':
1711 case 'R':
1712 do_pax_state(optarg[x], RANDMMAP);
1713 break;
1714 case 'x':
1715 case 'X':
1716 do_pax_state(optarg[x], RANDEXEC);
1717 break;
1718 default:
1719 break;
1720 }
1721 }
1722 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
1723 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
1724 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
1725 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
1726 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1727 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1728 setpax = flags;
1729 break;
1730 }
1731 case 'g': gmatch = 1; break;
1732 case 'L': use_ldcache = 1; break;
1733 case 'y': scan_symlink = 0; break;
1734 case 'A': scan_archives = 1; break;
1735 case 'B': show_banner = 0; break;
1736 case 'l': scan_ldpath = 1; break;
1737 case 'p': scan_envpath = 1; break;
1738 case 'R': dir_recurse = 1; break;
1739 case 'm': dir_crossmount = 0; break;
1740 case 'X': ++fix_elf; break;
1741 case 'x': show_pax = 1; break;
1742 case 'e': show_phdr = 1; break;
1743 case 't': show_textrel = 1; break;
1744 case 'r': show_rpath = 1; break;
1745 case 'n': show_needed = 1; break;
1746 case 'i': show_interp = 1; break;
1747 case 'b': show_bind = 1; break;
1748 case 'S': show_soname = 1; break;
1749 case 'T': show_textrels = 1; break;
1750 case 'q': be_quiet = 1; break;
1751 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1752 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
1753
1754 case ':':
1755 err("Option '%c' is missing parameter", optopt);
1756 case '?':
1757 err("Unknown option '%c' or argument missing", optopt);
1758 default:
1759 err("Unhandled option '%c'; please report this", i);
1760 }
1761 }
1762
1763 /* let the format option override all other options */
1764 if (out_format) {
1765 show_pax = show_phdr = show_textrel = show_rpath = \
1766 show_needed = show_interp = show_bind = show_soname = \
1767 show_textrels = 0;
1768 for (i = 0; out_format[i]; ++i) {
1769 if (!IS_MODIFIER(out_format[i])) continue;
1770
1771 switch (out_format[++i]) {
1772 case '+': break;
1773 case '%': break;
1774 case '#': break;
1775 case 'F': break;
1776 case 'p': break;
1777 case 'f': break;
1778 case 'k': break;
1779 case 's': break;
1780 case 'N': break;
1781 case 'o': break;
1782 case 'a': break;
1783 case 'x': show_pax = 1; break;
1784 case 'e': show_phdr = 1; break;
1785 case 't': show_textrel = 1; break;
1786 case 'r': show_rpath = 1; break;
1787 case 'n': show_needed = 1; break;
1788 case 'i': show_interp = 1; break;
1789 case 'b': show_bind = 1; break;
1790 case 'S': show_soname = 1; break;
1791 case 'T': show_textrels = 1; break;
1792 default:
1793 err("Invalid format specifier '%c' (byte %i)",
1794 out_format[i], i+1);
1795 }
1796 }
1797
1798 /* construct our default format */
1799 } else {
1800 size_t fmt_len = 30;
1801 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
1802 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1803 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1804 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1805 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1806 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1807 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1808 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1809 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1810 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1811 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1812 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1813 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1814 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1815 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1816 }
1817 if (be_verbose > 2) printf("Format: %s\n", out_format);
1818
1819 /* now lets actually do the scanning */
1820 if (scan_ldpath || use_ldcache)
1821 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
1822 if (scan_ldpath) scanelf_ldpath();
1823 if (scan_envpath) scanelf_envpath();
1824 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
1825 from_file = "-";
1826 if (from_file) {
1827 scanelf_from_file(from_file);
1828 from_file = *argv;
1829 }
1830 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1831 err("Nothing to scan !?");
1832 while (optind < argc) {
1833 search_path = argv[optind++];
1834 ret = scanelf_dir(search_path);
1835 }
1836
1837 /* clean up */
1838 free(versioned_symname);
1839 for (i = 0; ldpaths[i]; ++i)
1840 free(ldpaths[i]);
1841
1842 if (ldcache != 0)
1843 munmap(ldcache, ldcache_size);
1844 return ret;
1845 }
1846
1847 static char **get_split_env(const char *envvar)
1848 {
1849 const char *delims = " \t\n";
1850 char **envvals = NULL;
1851 char *env, *s;
1852 int nentry;
1853
1854 if ((env = getenv(envvar)) == NULL)
1855 return NULL;
1856
1857 env = xstrdup(env);
1858 if (env == NULL)
1859 return NULL;
1860
1861 s = strtok(env, delims);
1862 if (s == NULL) {
1863 free(env);
1864 return NULL;
1865 }
1866
1867 nentry = 0;
1868 while (s != NULL) {
1869 ++nentry;
1870 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
1871 envvals[nentry-1] = s;
1872 s = strtok(NULL, delims);
1873 }
1874 envvals[nentry] = NULL;
1875
1876 /* don't want to free(env) as it contains the memory that backs
1877 * the envvals array of strings */
1878 return envvals;
1879 }
1880 static void parseenv()
1881 {
1882 qa_textrels = get_split_env("QA_TEXTRELS");
1883 qa_execstack = get_split_env("QA_EXECSTACK");
1884 qa_wx_load = get_split_env("QA_WX_LOAD");
1885 }
1886
1887 #ifdef __PAX_UTILS_CLEANUP
1888 static void cleanup()
1889 {
1890 free(out_format);
1891 free(qa_textrels);
1892 free(qa_execstack);
1893 free(qa_wx_load);
1894 }
1895 #endif
1896
1897
1898 int main(int argc, char *argv[])
1899 {
1900 int ret;
1901 if (argc < 2)
1902 usage(EXIT_FAILURE);
1903 parseenv();
1904 ret = parseargs(argc, argv);
1905 fclose(stdout);
1906 #ifdef __PAX_UTILS_CLEANUP
1907 cleanup();
1908 warn("The calls to add/delete heap should be off:\n"
1909 "\t- 1 due to the out_buffer not being freed in scanelf_file()\n"
1910 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
1911 #endif
1912 return ret;
1913 }
1914
1915
1916
1917 /* utility funcs */
1918 static char *xstrdup(const char *s)
1919 {
1920 char *ret = strdup(s);
1921 if (!ret) err("Could not strdup(): %s", strerror(errno));
1922 return ret;
1923 }
1924 static void *xmalloc(size_t size)
1925 {
1926 void *ret = malloc(size);
1927 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1928 return ret;
1929 }
1930 static void *xrealloc(void *ptr, size_t size)
1931 {
1932 void *ret = realloc(ptr, size);
1933 if (!ret) err("Could not realloc() %li bytes", (unsigned long)size);
1934 return ret;
1935 }
1936 static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
1937 {
1938 size_t new_len;
1939
1940 new_len = strlen(*dst) + strlen(src);
1941 if (*curr_len <= new_len) {
1942 *curr_len = new_len + (*curr_len / 2);
1943 *dst = realloc(*dst, *curr_len);
1944 if (!*dst)
1945 err("could not realloc() %li bytes", (unsigned long)*curr_len);
1946 }
1947
1948 if (n)
1949 strncat(*dst, src, n);
1950 else
1951 strcat(*dst, src);
1952 }
1953 static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1954 {
1955 static char my_app[2];
1956 my_app[0] = append;
1957 my_app[1] = '\0';
1958 xstrcat(dst, my_app, curr_len);
1959 }
1960
1961 /* Match filename against entries in matchlist, return TRUE
1962 * if the file is listed */
1963 static int file_matches_list(const char *filename, char **matchlist)
1964 {
1965 char **file;
1966 char *match;
1967 char buf[__PAX_UTILS_PATH_MAX];
1968
1969 if (matchlist == NULL)
1970 return 0;
1971
1972 for (file = matchlist; *file != NULL; file++) {
1973 if (search_path) {
1974 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
1975 match = buf;
1976 } else {
1977 match = *file;
1978 }
1979 if (fnmatch(match, filename, 0) == 0)
1980 return 1;
1981 }
1982 return 0;
1983 }

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