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Revision 1.168 - (show annotations) (download) (as text)
Mon Jan 8 22:57:01 2007 UTC (7 years, 6 months ago) by vapier
Branch: MAIN
Changes since 1.167: +5 -3 lines
File MIME type: text/x-csrc
fix warnings on 32bit host

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 1.167 2007/01/08 07:55:11 vapier Exp $
5 *
6 * Copyright 2003-2006 Ned Ludd - <solar@gentoo.org>
7 * Copyright 2004-2006 Mike Frysinger - <vapier@gentoo.org>
8 */
9
10 #include "paxinc.h"
11
12 static const char *rcsid = "$Id: scanelf.c,v 1.167 2007/01/08 07:55:11 vapier Exp $";
13 #define argv0 "scanelf"
14
15 #define IS_MODIFIER(c) (c == '%' || c == '#' || c == '+')
16
17 /* prototypes */
18 static int file_matches_list(const char *filename, char **matchlist);
19 static int scanelf_elfobj(elfobj *elf);
20 static int scanelf_elf(const char *filename, int fd, size_t len);
21 static int scanelf_archive(const char *filename, int fd, size_t len);
22 static int scanelf_file(const char *filename, const struct stat *st_cache);
23 static int scanelf_dir(const char *path);
24 static void scanelf_ldpath(void);
25 static void scanelf_envpath(void);
26 static void usage(int status);
27 static char **get_split_env(const char *envvar);
28 static void parseenv(void);
29 static int parseargs(int argc, char *argv[]);
30 static char *xstrdup(const char *s);
31 static void *xmalloc(size_t size);
32 static void *xrealloc(void *ptr, size_t size);
33 static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n);
34 #define xstrcat(dst,src,curr_len) xstrncat(dst,src,curr_len,0)
35 static inline void xchrcat(char **dst, const char append, size_t *curr_len);
36
37 /* variables to control behavior */
38 static char match_etypes[126] = "";
39 static char *ldpaths[256];
40 static char scan_ldpath = 0;
41 static char scan_envpath = 0;
42 static char scan_symlink = 1;
43 static char scan_archives = 0;
44 static char dir_recurse = 0;
45 static char dir_crossmount = 1;
46 static char show_pax = 0;
47 static char show_phdr = 0;
48 static char show_textrel = 0;
49 static char show_rpath = 0;
50 static char show_needed = 0;
51 static char show_interp = 0;
52 static char show_bind = 0;
53 static char show_soname = 0;
54 static char show_textrels = 0;
55 static char show_banner = 1;
56 static char be_quiet = 0;
57 static char be_verbose = 0;
58 static char be_wewy_wewy_quiet = 0;
59 static char be_semi_verbose = 0;
60 static char *find_sym = NULL, *versioned_symname = NULL;
61 static char *find_lib = NULL;
62 static char *find_section = NULL;
63 static char *out_format = NULL;
64 static char *search_path = NULL;
65 static char fix_elf = 0;
66 static char gmatch = 0;
67 static char use_ldcache = 0;
68
69 static char **qa_textrels = NULL;
70 static char **qa_execstack = NULL;
71 static char **qa_wx_load = NULL;
72
73 int match_bits = 0;
74 caddr_t ldcache = 0;
75 size_t ldcache_size = 0;
76 unsigned long setpax = 0UL;
77
78
79
80 /* sub-funcs for scanelf_file() */
81 static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
82 {
83 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
84 #define GET_SYMTABS(B) \
85 if (elf->elf_class == ELFCLASS ## B) { \
86 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
87 /* debug sections */ \
88 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
89 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
90 /* runtime sections */ \
91 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
92 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
93 if (symtab && dynsym) { \
94 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \
95 } else { \
96 *sym = (void*)(symtab ? symtab : dynsym); \
97 } \
98 if (strtab && dynstr) { \
99 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \
100 } else { \
101 *tab = (void*)(strtab ? strtab : dynstr); \
102 } \
103 }
104 GET_SYMTABS(32)
105 GET_SYMTABS(64)
106 }
107
108 static char *scanelf_file_pax(elfobj *elf, char *found_pax)
109 {
110 static char ret[7];
111 unsigned long i, shown;
112
113 if (!show_pax) return NULL;
114
115 shown = 0;
116 memset(&ret, 0, sizeof(ret));
117
118 if (elf->phdr) {
119 #define SHOW_PAX(B) \
120 if (elf->elf_class == ELFCLASS ## B) { \
121 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
122 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
123 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
124 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
125 continue; \
126 if (fix_elf && setpax) { \
127 /* set the paxctl flags */ \
128 ESET(phdr[i].p_flags, setpax); \
129 } \
130 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
131 continue; \
132 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
133 *found_pax = 1; \
134 ++shown; \
135 break; \
136 } \
137 }
138 SHOW_PAX(32)
139 SHOW_PAX(64)
140 }
141
142
143 if (fix_elf && setpax) {
144 /* set the chpax settings */
145 if (elf->elf_class == ELFCLASS32) {
146 if (EHDR32(elf->ehdr)->e_type == ET_DYN || EHDR32(elf->ehdr)->e_type == ET_EXEC)
147 ESET(EHDR32(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
148 } else {
149 if (EHDR64(elf->ehdr)->e_type == ET_DYN || EHDR64(elf->ehdr)->e_type == ET_EXEC)
150 ESET(EHDR64(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
151 }
152 }
153
154 /* fall back to EI_PAX if no PT_PAX was found */
155 if (!*ret) {
156 static char *paxflags;
157 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
158 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
159 *found_pax = 1;
160 return (be_wewy_wewy_quiet ? NULL : paxflags);
161 }
162 strncpy(ret, paxflags, sizeof(ret));
163 }
164
165 if (be_wewy_wewy_quiet || (be_quiet && !shown))
166 return NULL;
167 else
168 return ret;
169 }
170
171 static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
172 {
173 static char ret[12];
174 char *found;
175 unsigned long i, shown, multi_stack, multi_relro, multi_load;
176 int max_pt_load;
177
178 if (!show_phdr) return NULL;
179
180 memcpy(ret, "--- --- ---\0", 12);
181
182 shown = 0;
183 multi_stack = multi_relro = multi_load = 0;
184 max_pt_load = elf_max_pt_load(elf);
185
186 #define NOTE_GNU_STACK ".note.GNU-stack"
187 #define SHOW_PHDR(B) \
188 if (elf->elf_class == ELFCLASS ## B) { \
189 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
190 Elf ## B ## _Off offset; \
191 uint32_t flags, check_flags; \
192 if (elf->phdr != NULL) { \
193 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
194 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
195 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
196 if (multi_stack++) \
197 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
198 if (file_matches_list(elf->filename, qa_execstack)) \
199 continue; \
200 found = found_phdr; \
201 offset = 0; \
202 check_flags = PF_X; \
203 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
204 if (multi_relro++) \
205 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
206 found = found_relro; \
207 offset = 4; \
208 check_flags = PF_X; \
209 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
210 if (ehdr->e_type == ET_DYN || ehdr->e_type == ET_EXEC) \
211 if (multi_load++ > max_pt_load) \
212 warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
213 if (file_matches_list(elf->filename, qa_wx_load)) \
214 continue; \
215 found = found_load; \
216 offset = 8; \
217 check_flags = PF_W|PF_X; \
218 } else \
219 continue; \
220 flags = EGET(phdr[i].p_flags); \
221 if (be_quiet && ((flags & check_flags) != check_flags)) \
222 continue; \
223 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
224 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
225 ret[3] = ret[7] = '!'; \
226 flags = EGET(phdr[i].p_flags); \
227 } \
228 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
229 *found = 1; \
230 ++shown; \
231 } \
232 } else if (elf->shdr != NULL) { \
233 /* no program headers which means this is prob an object file */ \
234 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
235 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
236 char *str; \
237 if ((void*)strtbl > (void*)elf->data_end) \
238 goto skip_this_shdr##B; \
239 check_flags = SHF_WRITE|SHF_EXECINSTR; \
240 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
241 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
242 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
243 str = elf->data + offset; \
244 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
245 if (!strcmp(str, NOTE_GNU_STACK)) { \
246 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
247 flags = EGET(shdr[i].sh_flags); \
248 if (be_quiet && ((flags & check_flags) != check_flags)) \
249 continue; \
250 ++*found_phdr; \
251 shown = 1; \
252 if (flags & SHF_WRITE) ret[0] = 'W'; \
253 if (flags & SHF_ALLOC) ret[1] = 'A'; \
254 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
255 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
256 break; \
257 } \
258 } \
259 skip_this_shdr##B: \
260 if (!multi_stack) { \
261 if (file_matches_list(elf->filename, qa_execstack)) \
262 return NULL; \
263 *found_phdr = 1; \
264 shown = 1; \
265 memcpy(ret, "!WX", 3); \
266 } \
267 } \
268 }
269 SHOW_PHDR(32)
270 SHOW_PHDR(64)
271
272 if (be_wewy_wewy_quiet || (be_quiet && !shown))
273 return NULL;
274 else
275 return ret;
276 }
277
278 static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
279 {
280 static const char *ret = "TEXTREL";
281 unsigned long i;
282
283 if (!show_textrel && !show_textrels) return NULL;
284
285 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
286
287 if (elf->phdr) {
288 #define SHOW_TEXTREL(B) \
289 if (elf->elf_class == ELFCLASS ## B) { \
290 Elf ## B ## _Dyn *dyn; \
291 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
292 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
293 Elf ## B ## _Off offset; \
294 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
295 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
296 offset = EGET(phdr[i].p_offset); \
297 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
298 dyn = DYN ## B (elf->data + offset); \
299 while (EGET(dyn->d_tag) != DT_NULL) { \
300 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
301 *found_textrel = 1; \
302 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
303 return (be_wewy_wewy_quiet ? NULL : ret); \
304 } \
305 ++dyn; \
306 } \
307 } }
308 SHOW_TEXTREL(32)
309 SHOW_TEXTREL(64)
310 }
311
312 if (be_quiet || be_wewy_wewy_quiet)
313 return NULL;
314 else
315 return " - ";
316 }
317 static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
318 {
319 unsigned long s, r, rmax;
320 void *symtab_void, *strtab_void, *text_void;
321
322 if (!show_textrels) return NULL;
323
324 /* don't search for TEXTREL's if the ELF doesn't have any */
325 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
326 if (!*found_textrel) return NULL;
327
328 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
329 text_void = elf_findsecbyname(elf, ".text");
330
331 if (symtab_void && strtab_void && text_void && elf->shdr) {
332 #define SHOW_TEXTRELS(B) \
333 if (elf->elf_class == ELFCLASS ## B) { \
334 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
335 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
336 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
337 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
338 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
339 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
340 uint ## B ## _t memsz = EGET(text->sh_size); \
341 Elf ## B ## _Rel *rel; \
342 Elf ## B ## _Rela *rela; \
343 /* search the section headers for relocations */ \
344 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
345 uint32_t sh_type = EGET(shdr[s].sh_type); \
346 if (sh_type == SHT_REL) { \
347 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \
348 rela = NULL; \
349 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
350 } else if (sh_type == SHT_RELA) { \
351 rel = NULL; \
352 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \
353 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
354 } else \
355 continue; \
356 /* now see if any of the relocs are in the .text */ \
357 for (r = 0; r < rmax; ++r) { \
358 unsigned long sym_max; \
359 Elf ## B ## _Addr offset_tmp; \
360 Elf ## B ## _Sym *func; \
361 Elf ## B ## _Sym *sym; \
362 Elf ## B ## _Addr r_offset; \
363 uint ## B ## _t r_info; \
364 if (sh_type == SHT_REL) { \
365 r_offset = EGET(rel[r].r_offset); \
366 r_info = EGET(rel[r].r_info); \
367 } else { \
368 r_offset = EGET(rela[r].r_offset); \
369 r_info = EGET(rela[r].r_info); \
370 } \
371 /* make sure this relocation is inside of the .text */ \
372 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
373 if (be_verbose <= 2) continue; \
374 } else \
375 *found_textrels = 1; \
376 /* locate this relocation symbol name */ \
377 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
378 if ((void*)sym > (void*)elf->data_end) { \
379 warn("%s: corrupt ELF symbol", elf->filename); \
380 continue; \
381 } \
382 sym_max = ELF ## B ## _R_SYM(r_info); \
383 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
384 sym += sym_max; \
385 else \
386 sym = NULL; \
387 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
388 /* show the raw details about this reloc */ \
389 printf(" %s: ", elf->base_filename); \
390 if (sym && sym->st_name) \
391 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \
392 else \
393 printf("(memory/fake?)"); \
394 printf(" [0x%lX]", (unsigned long)r_offset); \
395 /* now try to find the closest symbol that this rel is probably in */ \
396 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
397 func = NULL; \
398 offset_tmp = 0; \
399 while (sym_max--) { \
400 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
401 func = sym; \
402 offset_tmp = EGET(sym->st_value); \
403 } \
404 ++sym; \
405 } \
406 printf(" in "); \
407 if (func && func->st_name) \
408 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \
409 else \
410 printf("(NULL: fake?)"); \
411 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
412 if (be_verbose) { \
413 char *sysbuf; \
414 size_t syslen; \
415 const char sysfmt[] = "objdump -r -R -d -w -l --start-address=0x%lX --stop-address=0x%lX %s | grep --color -i -C 3 '.*[[:space:]]%lX:[[:space:]]*R_.*'\n"; \
416 syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
417 sysbuf = xmalloc(syslen); \
418 if (sysbuf) { \
419 snprintf(sysbuf, syslen, sysfmt, \
420 (unsigned long)offset_tmp, \
421 (unsigned long)(offset_tmp + EGET(func->st_size)), \
422 elf->filename, \
423 (unsigned long)r_offset); \
424 fflush(stdout); \
425 system(sysbuf); \
426 fflush(stdout); \
427 free(sysbuf); \
428 } \
429 } \
430 } \
431 } }
432 SHOW_TEXTRELS(32)
433 SHOW_TEXTRELS(64)
434 }
435 if (!*found_textrels)
436 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
437
438 return NULL;
439 }
440
441 static void rpath_security_checks(elfobj *, char *, const char *);
442 static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
443 {
444 struct stat st;
445 switch (*item) {
446 case '/': break;
447 case '.':
448 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
449 break;
450 case ':':
451 case '\0':
452 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
453 break;
454 case '$':
455 if (fstat(elf->fd, &st) != -1)
456 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
457 warnf("Security problem with %s='%s' in %s with mode set of %o",
458 dt_type, item, elf->filename, st.st_mode & 07777);
459 break;
460 default:
461 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
462 break;
463 }
464 }
465 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
466 {
467 unsigned long i, s;
468 char *rpath, *runpath, **r;
469 void *strtbl_void;
470
471 if (!show_rpath) return;
472
473 strtbl_void = elf_findsecbyname(elf, ".dynstr");
474 rpath = runpath = NULL;
475
476 if (elf->phdr && strtbl_void) {
477 #define SHOW_RPATH(B) \
478 if (elf->elf_class == ELFCLASS ## B) { \
479 Elf ## B ## _Dyn *dyn; \
480 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
481 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
482 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
483 Elf ## B ## _Off offset; \
484 Elf ## B ## _Xword word; \
485 /* Scan all the program headers */ \
486 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
487 /* Just scan dynamic headers */ \
488 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
489 offset = EGET(phdr[i].p_offset); \
490 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
491 /* Just scan dynamic RPATH/RUNPATH headers */ \
492 dyn = DYN ## B (elf->data + offset); \
493 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
494 if (word == DT_RPATH) { \
495 r = &rpath; \
496 } else if (word == DT_RUNPATH) { \
497 r = &runpath; \
498 } else { \
499 ++dyn; \
500 continue; \
501 } \
502 /* Verify the memory is somewhat sane */ \
503 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
504 if (offset < (Elf ## B ## _Off)elf->len) { \
505 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
506 *r = (char*)(elf->data + offset); \
507 /* cache the length in case we need to nuke this section later on */ \
508 if (fix_elf) \
509 offset = strlen(*r); \
510 /* If quiet, don't output paths in ld.so.conf */ \
511 if (be_quiet) { \
512 size_t len; \
513 char *start, *end; \
514 /* note that we only 'chop' off leading known paths. */ \
515 /* since *r is read-only memory, we can only move the ptr forward. */ \
516 start = *r; \
517 /* scan each path in : delimited list */ \
518 while (start) { \
519 rpath_security_checks(elf, start, get_elfdtype(word)); \
520 end = strchr(start, ':'); \
521 len = (end ? abs(end - start) : strlen(start)); \
522 if (use_ldcache) \
523 for (s = 0; ldpaths[s]; ++s) \
524 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
525 *r = end; \
526 /* corner case ... if RPATH reads "/usr/lib:", we want \
527 * to show ':' rather than '' */ \
528 if (end && end[1] != '\0') \
529 (*r)++; \
530 break; \
531 } \
532 if (!*r || !end) \
533 break; \
534 else \
535 start = start + len + 1; \
536 } \
537 } \
538 if (*r) { \
539 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
540 /* just nuke it */ \
541 nuke_it##B: \
542 memset(*r, 0x00, offset); \
543 *r = NULL; \
544 ESET(dyn->d_tag, DT_DEBUG); \
545 ESET(dyn->d_un.d_ptr, 0); \
546 } else if (fix_elf) { \
547 /* try to clean "bad" paths */ \
548 size_t len, tmpdir_len; \
549 char *start, *end; \
550 const char *tmpdir; \
551 start = *r; \
552 tmpdir = (getenv("TMPDIR") ? : "."); \
553 tmpdir_len = strlen(tmpdir); \
554 while (1) { \
555 end = strchr(start, ':'); \
556 if (start == end) { \
557 eat_this_path##B: \
558 len = strlen(end); \
559 memmove(start, end+1, len); \
560 start[len-1] = '\0'; \
561 end = start - 1; \
562 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
563 if (!end) { \
564 if (start == *r) \
565 goto nuke_it##B; \
566 *--start = '\0'; \
567 } else \
568 goto eat_this_path##B; \
569 } \
570 if (!end) \
571 break; \
572 start = end + 1; \
573 } \
574 if (**r == '\0') \
575 goto nuke_it##B; \
576 } \
577 if (*r) \
578 *found_rpath = 1; \
579 } \
580 } \
581 ++dyn; \
582 } \
583 } }
584 SHOW_RPATH(32)
585 SHOW_RPATH(64)
586 }
587
588 if (be_wewy_wewy_quiet) return;
589
590 if (rpath && runpath) {
591 if (!strcmp(rpath, runpath)) {
592 xstrcat(ret, runpath, ret_len);
593 } else {
594 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
595 xchrcat(ret, '{', ret_len);
596 xstrcat(ret, rpath, ret_len);
597 xchrcat(ret, ',', ret_len);
598 xstrcat(ret, runpath, ret_len);
599 xchrcat(ret, '}', ret_len);
600 }
601 } else if (rpath || runpath)
602 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
603 else if (!be_quiet)
604 xstrcat(ret, " - ", ret_len);
605 }
606
607 #define LDSO_CACHE_MAGIC "ld.so-"
608 #define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
609 #define LDSO_CACHE_VER "1.7.0"
610 #define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
611 #define FLAG_ANY -1
612 #define FLAG_TYPE_MASK 0x00ff
613 #define FLAG_LIBC4 0x0000
614 #define FLAG_ELF 0x0001
615 #define FLAG_ELF_LIBC5 0x0002
616 #define FLAG_ELF_LIBC6 0x0003
617 #define FLAG_REQUIRED_MASK 0xff00
618 #define FLAG_SPARC_LIB64 0x0100
619 #define FLAG_IA64_LIB64 0x0200
620 #define FLAG_X8664_LIB64 0x0300
621 #define FLAG_S390_LIB64 0x0400
622 #define FLAG_POWERPC_LIB64 0x0500
623 #define FLAG_MIPS64_LIBN32 0x0600
624 #define FLAG_MIPS64_LIBN64 0x0700
625
626 static char *lookup_cache_lib(elfobj *, char *);
627
628 #if defined(__GLIBC__) || defined(__UCLIBC__)
629
630 static char *lookup_cache_lib(elfobj *elf, char *fname)
631 {
632 int fd = 0;
633 char *strs;
634 static char buf[__PAX_UTILS_PATH_MAX] = "";
635 const char *cachefile = "/etc/ld.so.cache";
636 struct stat st;
637
638 typedef struct {
639 char magic[LDSO_CACHE_MAGIC_LEN];
640 char version[LDSO_CACHE_VER_LEN];
641 int nlibs;
642 } header_t;
643 header_t *header;
644
645 typedef struct {
646 int flags;
647 int sooffset;
648 int liboffset;
649 } libentry_t;
650 libentry_t *libent;
651
652 if (fname == NULL)
653 return NULL;
654
655 if (ldcache == 0) {
656 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1)
657 return NULL;
658
659 /* cache these values so we only map/unmap the cache file once */
660 ldcache_size = st.st_size;
661 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
662
663 close(fd);
664
665 if (ldcache == (caddr_t)-1) {
666 ldcache = 0;
667 return NULL;
668 }
669
670 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
671 return NULL;
672 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
673 return NULL;
674 }
675
676 header = (header_t *) ldcache;
677 libent = (libentry_t *) (ldcache + sizeof(header_t));
678 strs = (char *) &libent[header->nlibs];
679
680 for (fd = 0; fd < header->nlibs; fd++) {
681 /* this should be more fine grained, but for now we assume that
682 * diff arches will not be cached together. and we ignore the
683 * the different multilib mips cases. */
684 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
685 continue;
686 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
687 continue;
688
689 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
690 continue;
691 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
692 }
693 return buf;
694 }
695 #elif defined(__NetBSD__)
696 static char *lookup_cache_lib(elfobj *elf, char *fname)
697 {
698 static char buf[__PAX_UTILS_PATH_MAX] = "";
699 static struct stat st;
700
701 char **ldpath;
702 for (ldpath = ldpaths; *ldpath != NULL; ldpath++) {
703 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", *ldpath, fname) >= sizeof(buf))
704 continue; /* if the pathname is too long, or something went wrong, ignore */
705
706 if (stat(buf, &st) != 0)
707 continue; /* if the lib doesn't exist in *ldpath, look further */
708
709 /* NetBSD doesn't actually do sanity checks, it just loads the file
710 * and if that doesn't work, continues looking in other directories.
711 * This cannot easily be safely emulated, unfortunately. For now,
712 * just assume that if it exists, it's a valid library. */
713
714 return buf;
715 }
716
717 /* not found in any path */
718 return NULL;
719 }
720 #else
721 #warning Cache support not implemented for your target
722 static char *lookup_cache_lib(elfobj *elf, char *fname)
723 {
724 return NULL;
725 }
726 #endif
727
728 static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
729 {
730 unsigned long i;
731 char *needed;
732 void *strtbl_void;
733 char *p;
734
735 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
736
737 strtbl_void = elf_findsecbyname(elf, ".dynstr");
738
739 if (elf->phdr && strtbl_void) {
740 #define SHOW_NEEDED(B) \
741 if (elf->elf_class == ELFCLASS ## B) { \
742 Elf ## B ## _Dyn *dyn; \
743 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
744 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
745 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
746 Elf ## B ## _Off offset; \
747 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
748 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
749 offset = EGET(phdr[i].p_offset); \
750 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
751 dyn = DYN ## B (elf->data + offset); \
752 while (EGET(dyn->d_tag) != DT_NULL) { \
753 if (EGET(dyn->d_tag) == DT_NEEDED) { \
754 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
755 if (offset >= (Elf ## B ## _Off)elf->len) { \
756 ++dyn; \
757 continue; \
758 } \
759 needed = (char*)(elf->data + offset); \
760 if (op == 0) { \
761 if (!be_wewy_wewy_quiet) { \
762 if (*found_needed) xchrcat(ret, ',', ret_len); \
763 if (use_ldcache) \
764 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
765 needed = p; \
766 xstrcat(ret, needed, ret_len); \
767 } \
768 *found_needed = 1; \
769 } else { \
770 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \
771 *found_lib = 1; \
772 return (be_wewy_wewy_quiet ? NULL : needed); \
773 } \
774 } \
775 } \
776 ++dyn; \
777 } \
778 } }
779 SHOW_NEEDED(32)
780 SHOW_NEEDED(64)
781 if (op == 0 && !*found_needed && be_verbose)
782 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
783 }
784
785 return NULL;
786 }
787 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
788 {
789 void *strtbl_void;
790
791 if (!show_interp) return NULL;
792
793 strtbl_void = elf_findsecbyname(elf, ".interp");
794
795 if (strtbl_void) {
796 #define SHOW_INTERP(B) \
797 if (elf->elf_class == ELFCLASS ## B) { \
798 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
799 *found_interp = 1; \
800 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
801 }
802 SHOW_INTERP(32)
803 SHOW_INTERP(64)
804 }
805 return NULL;
806 }
807 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
808 {
809 unsigned long i;
810 struct stat s;
811 char dynamic = 0;
812
813 if (!show_bind) return NULL;
814 if (!elf->phdr) return NULL;
815
816 #define SHOW_BIND(B) \
817 if (elf->elf_class == ELFCLASS ## B) { \
818 Elf ## B ## _Dyn *dyn; \
819 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
820 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
821 Elf ## B ## _Off offset; \
822 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
823 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
824 dynamic = 1; \
825 offset = EGET(phdr[i].p_offset); \
826 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
827 dyn = DYN ## B (elf->data + offset); \
828 while (EGET(dyn->d_tag) != DT_NULL) { \
829 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
830 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
831 { \
832 if (be_quiet) return NULL; \
833 *found_bind = 1; \
834 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
835 } \
836 ++dyn; \
837 } \
838 } \
839 }
840 SHOW_BIND(32)
841 SHOW_BIND(64)
842
843 if (be_wewy_wewy_quiet) return NULL;
844
845 /* don't output anything if quiet mode and the ELF is static or not setuid */
846 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
847 return NULL;
848 } else {
849 *found_bind = 1;
850 return (char *) (dynamic ? "LAZY" : "STATIC");
851 }
852 }
853 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
854 {
855 unsigned long i;
856 char *soname;
857 void *strtbl_void;
858
859 if (!show_soname) return NULL;
860
861 strtbl_void = elf_findsecbyname(elf, ".dynstr");
862
863 if (elf->phdr && strtbl_void) {
864 #define SHOW_SONAME(B) \
865 if (elf->elf_class == ELFCLASS ## B) { \
866 Elf ## B ## _Dyn *dyn; \
867 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
868 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
869 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
870 Elf ## B ## _Off offset; \
871 /* only look for soname in shared objects */ \
872 if (ehdr->e_type != ET_DYN) \
873 return NULL; \
874 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
875 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
876 offset = EGET(phdr[i].p_offset); \
877 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
878 dyn = DYN ## B (elf->data + offset); \
879 while (EGET(dyn->d_tag) != DT_NULL) { \
880 if (EGET(dyn->d_tag) == DT_SONAME) { \
881 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
882 if (offset >= (Elf ## B ## _Off)elf->len) { \
883 ++dyn; \
884 continue; \
885 } \
886 soname = (char*)(elf->data + offset); \
887 *found_soname = 1; \
888 return (be_wewy_wewy_quiet ? NULL : soname); \
889 } \
890 ++dyn; \
891 } \
892 } }
893 SHOW_SONAME(32)
894 SHOW_SONAME(64)
895 }
896
897 return NULL;
898 }
899 static char *scanelf_file_sym(elfobj *elf, char *found_sym)
900 {
901 unsigned long i;
902 char *ret;
903 void *symtab_void, *strtab_void;
904
905 if (!find_sym) return NULL;
906 ret = find_sym;
907
908 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
909
910 if (symtab_void && strtab_void) {
911 #define FIND_SYM(B) \
912 if (elf->elf_class == ELFCLASS ## B) { \
913 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
914 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
915 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
916 unsigned long cnt = EGET(symtab->sh_entsize); \
917 char *symname; \
918 if (cnt) \
919 cnt = EGET(symtab->sh_size) / cnt; \
920 for (i = 0; i < cnt; ++i) { \
921 if (sym->st_name) { \
922 /* make sure the symbol name is in acceptable memory range */ \
923 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
924 if ((void*)symname > (void*)elf->data_end) { \
925 warnf("%s: corrupt ELF symbols", elf->filename); \
926 ++sym; \
927 continue; \
928 } \
929 /* debug display ... show all symbols and some extra info */ \
930 if (*ret == '*') { \
931 printf("%s(%s) %5lX %15s %s\n", \
932 ((*found_sym == 0) ? "\n\t" : "\t"), \
933 elf->base_filename, \
934 (unsigned long)sym->st_size, \
935 get_elfstttype(sym->st_info), \
936 symname); \
937 *found_sym = 1; \
938 } else { \
939 /* allow the user to specify a comma delimited list of symbols to search for */ \
940 char *this_sym, *this_sym_ver, *next_sym; \
941 this_sym = ret; \
942 this_sym_ver = versioned_symname; \
943 do { \
944 next_sym = strchr(this_sym, ','); \
945 if (next_sym == NULL) \
946 next_sym = this_sym + strlen(this_sym); \
947 /* do we want a defined symbol ? */ \
948 if (*this_sym == '+') { \
949 if (sym->st_shndx == SHN_UNDEF) \
950 goto skip_this_sym##B; \
951 ++this_sym; \
952 ++this_sym_ver; \
953 /* do we want an undefined symbol ? */ \
954 } else if (*this_sym == '-') { \
955 if (sym->st_shndx != SHN_UNDEF) \
956 goto skip_this_sym##B; \
957 ++this_sym; \
958 ++this_sym_ver; \
959 } \
960 /* ok, lets compare the name now */ \
961 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
962 (strncmp(this_sym_ver, symname, strlen(this_sym_ver)) == 0)) { \
963 if (be_semi_verbose) { \
964 char buf[126]; \
965 snprintf(buf, sizeof(buf), "%lX %s %s", \
966 (unsigned long)sym->st_size, get_elfstttype(sym->st_info), this_sym); \
967 ret = buf; \
968 } else \
969 ret = this_sym; \
970 (*found_sym)++; \
971 goto break_out; \
972 } \
973 skip_this_sym##B: this_sym = next_sym + 1; \
974 } while (*next_sym != '\0'); \
975 } \
976 } \
977 ++sym; \
978 } }
979 FIND_SYM(32)
980 FIND_SYM(64)
981 }
982
983 break_out:
984 if (be_wewy_wewy_quiet) return NULL;
985
986 if (*find_sym != '*' && *found_sym)
987 return ret;
988 if (be_quiet)
989 return NULL;
990 else
991 return (char *)" - ";
992 }
993
994
995 static char *scanelf_file_sections(elfobj *elf, char *found_section)
996 {
997 if (!find_section)
998 return NULL;
999
1000 #define FIND_SECTION(B) \
1001 if (elf->elf_class == ELFCLASS ## B) { \
1002 int invert; \
1003 Elf ## B ## _Shdr *section; \
1004 invert = (*find_section == '!' ? 1 : 0); \
1005 section = SHDR ## B (elf_findsecbyname(elf, find_section+invert)); \
1006 if ((section == NULL && invert) || (section != NULL && !invert)) \
1007 *found_section = 1; \
1008 }
1009 FIND_SECTION(32)
1010 FIND_SECTION(64)
1011
1012 if (be_wewy_wewy_quiet)
1013 return NULL;
1014
1015 if (*found_section)
1016 return find_section;
1017
1018 if (be_quiet)
1019 return NULL;
1020 else
1021 return (char *)" - ";
1022 }
1023
1024 /* scan an elf file and show all the fun stuff */
1025 #define prints(str) write(fileno(stdout), str, strlen(str))
1026 static int scanelf_elfobj(elfobj *elf)
1027 {
1028 unsigned long i;
1029 char found_pax, found_phdr, found_relro, found_load, found_textrel,
1030 found_rpath, found_needed, found_interp, found_bind, found_soname,
1031 found_sym, found_lib, found_file, found_textrels, found_section;
1032 static char *out_buffer = NULL;
1033 static size_t out_len;
1034
1035 found_pax = found_phdr = found_relro = found_load = found_textrel = \
1036 found_rpath = found_needed = found_interp = found_bind = found_soname = \
1037 found_sym = found_lib = found_file = found_textrels = found_section = 0;
1038
1039 if (be_verbose > 2)
1040 printf("%s: scanning file {%s,%s}\n", elf->filename,
1041 get_elfeitype(EI_CLASS, elf->elf_class),
1042 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
1043 else if (be_verbose > 1)
1044 printf("%s: scanning file\n", elf->filename);
1045
1046 /* init output buffer */
1047 if (!out_buffer) {
1048 out_len = sizeof(char) * 80;
1049 out_buffer = (char*)xmalloc(out_len);
1050 }
1051 *out_buffer = '\0';
1052
1053 /* show the header */
1054 if (!be_quiet && show_banner) {
1055 for (i = 0; out_format[i]; ++i) {
1056 if (!IS_MODIFIER(out_format[i])) continue;
1057
1058 switch (out_format[++i]) {
1059 case '+': break;
1060 case '%': break;
1061 case '#': break;
1062 case 'F':
1063 case 'p':
1064 case 'f': prints("FILE "); found_file = 1; break;
1065 case 'o': prints(" TYPE "); break;
1066 case 'x': prints(" PAX "); break;
1067 case 'e': prints("STK/REL/PTL "); break;
1068 case 't': prints("TEXTREL "); break;
1069 case 'r': prints("RPATH "); break;
1070 case 'n': prints("NEEDED "); break;
1071 case 'i': prints("INTERP "); break;
1072 case 'b': prints("BIND "); break;
1073 case 'S': prints("SONAME "); break;
1074 case 's': prints("SYM "); break;
1075 case 'N': prints("LIB "); break;
1076 case 'T': prints("TEXTRELS "); break;
1077 case 'k': prints("SECTION "); break;
1078 case 'a': prints("ARCH "); break;
1079 default: warnf("'%c' has no title ?", out_format[i]);
1080 }
1081 }
1082 if (!found_file) prints("FILE ");
1083 prints("\n");
1084 found_file = 0;
1085 show_banner = 0;
1086 }
1087
1088 /* dump all the good stuff */
1089 for (i = 0; out_format[i]; ++i) {
1090 const char *out;
1091 const char *tmp;
1092
1093 if (!IS_MODIFIER(out_format[i])) {
1094 xchrcat(&out_buffer, out_format[i], &out_len);
1095 continue;
1096 }
1097
1098 out = NULL;
1099 be_wewy_wewy_quiet = (out_format[i] == '#');
1100 be_semi_verbose = (out_format[i] == '+');
1101 switch (out_format[++i]) {
1102 case '+':
1103 case '%':
1104 case '#':
1105 xchrcat(&out_buffer, out_format[i], &out_len); break;
1106 case 'F':
1107 found_file = 1;
1108 if (be_wewy_wewy_quiet) break;
1109 xstrcat(&out_buffer, elf->filename, &out_len);
1110 break;
1111 case 'p':
1112 found_file = 1;
1113 if (be_wewy_wewy_quiet) break;
1114 tmp = elf->filename;
1115 if (search_path) {
1116 ssize_t len_search = strlen(search_path);
1117 ssize_t len_file = strlen(elf->filename);
1118 if (!strncmp(elf->filename, search_path, len_search) && \
1119 len_file > len_search)
1120 tmp += len_search;
1121 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1122 }
1123 xstrcat(&out_buffer, tmp, &out_len);
1124 break;
1125 case 'f':
1126 found_file = 1;
1127 if (be_wewy_wewy_quiet) break;
1128 tmp = strrchr(elf->filename, '/');
1129 tmp = (tmp == NULL ? elf->filename : tmp+1);
1130 xstrcat(&out_buffer, tmp, &out_len);
1131 break;
1132 case 'o': out = get_elfetype(elf); break;
1133 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
1134 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
1135 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1136 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
1137 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1138 case 'n':
1139 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
1140 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1141 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1142 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
1143 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1144 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1145 case 'a': out = get_elfemtype(elf); break;
1146 default: warnf("'%c' has no scan code?", out_format[i]);
1147 }
1148 if (out) {
1149 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
1150 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
1151 xstrncat(&out_buffer, out, &out_len, (tmp-out));
1152 else
1153 xstrcat(&out_buffer, out, &out_len);
1154 }
1155 }
1156
1157 #define FOUND_SOMETHING() \
1158 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1159 found_rpath || found_needed || found_interp || found_bind || \
1160 found_soname || found_sym || found_lib || found_textrels || found_section )
1161
1162 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1163 xchrcat(&out_buffer, ' ', &out_len);
1164 xstrcat(&out_buffer, elf->filename, &out_len);
1165 }
1166 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
1167 puts(out_buffer);
1168 fflush(stdout);
1169 }
1170
1171 return 0;
1172 }
1173
1174 /* scan a single elf */
1175 static int scanelf_elf(const char *filename, int fd, size_t len)
1176 {
1177 int ret = 1;
1178 elfobj *elf;
1179
1180 /* verify this is real ELF */
1181 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1182 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1183 return ret;
1184 }
1185 switch (match_bits) {
1186 case 32:
1187 if (elf->elf_class != ELFCLASS32)
1188 goto label_done;
1189 break;
1190 case 64:
1191 if (elf->elf_class != ELFCLASS64)
1192 goto label_done;
1193 break;
1194 default: break;
1195 }
1196 if (strlen(match_etypes)) {
1197 char sbuf[126];
1198 strncpy(sbuf, match_etypes, sizeof(sbuf));
1199 if (strchr(match_etypes, ',') != NULL) {
1200 char *p;
1201 while((p = strrchr(sbuf, ',')) != NULL) {
1202 *p = 0;
1203 if (etype_lookup(p+1) == get_etype(elf))
1204 goto label_ret;
1205 }
1206 }
1207 if (etype_lookup(sbuf) != get_etype(elf))
1208 goto label_done;
1209 }
1210
1211 label_ret:
1212 ret = scanelf_elfobj(elf);
1213
1214 label_done:
1215 unreadelf(elf);
1216 return ret;
1217 }
1218
1219 /* scan an archive of elfs */
1220 static int scanelf_archive(const char *filename, int fd, size_t len)
1221 {
1222 archive_handle *ar;
1223 archive_member *m;
1224 char *ar_buffer;
1225 elfobj *elf;
1226
1227 ar = ar_open_fd(filename, fd);
1228 if (ar == NULL)
1229 return 1;
1230
1231 ar_buffer = (char*)mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1232 while ((m=ar_next(ar)) != NULL) {
1233 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size);
1234 if (elf) {
1235 scanelf_elfobj(elf);
1236 unreadelf(elf);
1237 }
1238 }
1239 munmap(ar_buffer, len);
1240
1241 return 0;
1242 }
1243 /* scan a file which may be an elf or an archive or some other magical beast */
1244 static int scanelf_file(const char *filename, const struct stat *st_cache)
1245 {
1246 const struct stat *st = st_cache;
1247 struct stat symlink_st;
1248 int fd;
1249
1250 /* always handle regular files and handle symlinked files if no -y */
1251 if (S_ISLNK(st->st_mode)) {
1252 if (!scan_symlink) return 1;
1253 stat(filename, &symlink_st);
1254 st = &symlink_st;
1255 }
1256
1257 if (!S_ISREG(st->st_mode)) {
1258 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1259 return 1;
1260 }
1261
1262 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1263 return 1;
1264
1265 if (scanelf_elf(filename, fd, st->st_size) == 1 && scan_archives)
1266 /* if it isn't an ELF, maybe it's an .a archive */
1267 scanelf_archive(filename, fd, st->st_size);
1268
1269 close(fd);
1270 return 0;
1271 }
1272
1273 /* scan a directory for ET_EXEC files and print when we find one */
1274 static int scanelf_dir(const char *path)
1275 {
1276 register DIR *dir;
1277 register struct dirent *dentry;
1278 struct stat st_top, st;
1279 char buf[__PAX_UTILS_PATH_MAX];
1280 size_t pathlen = 0, len = 0;
1281 int ret = 0;
1282
1283 /* make sure path exists */
1284 if (lstat(path, &st_top) == -1) {
1285 if (be_verbose > 2) printf("%s: does not exist\n", path);
1286 return 1;
1287 }
1288
1289 /* ok, if it isn't a directory, assume we can open it */
1290 if (!S_ISDIR(st_top.st_mode)) {
1291 return scanelf_file(path, &st_top);
1292 }
1293
1294 /* now scan the dir looking for fun stuff */
1295 if ((dir = opendir(path)) == NULL) {
1296 warnf("could not opendir %s: %s", path, strerror(errno));
1297 return 1;
1298 }
1299 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1300
1301 pathlen = strlen(path);
1302 while ((dentry = readdir(dir))) {
1303 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1304 continue;
1305 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
1306 if (len >= sizeof(buf)) {
1307 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1308 (unsigned long)len, (unsigned long)sizeof(buf));
1309 continue;
1310 }
1311 snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name);
1312 if (lstat(buf, &st) != -1) {
1313 if (S_ISREG(st.st_mode))
1314 ret = scanelf_file(buf, &st);
1315 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1316 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1317 ret = scanelf_dir(buf);
1318 }
1319 }
1320 }
1321 closedir(dir);
1322 return ret;
1323 }
1324
1325 static int scanelf_from_file(const char *filename)
1326 {
1327 FILE *fp = NULL;
1328 char *p;
1329 char path[__PAX_UTILS_PATH_MAX];
1330 int ret = 0;
1331
1332 if (strcmp(filename, "-") == 0)
1333 fp = stdin;
1334 else if ((fp = fopen(filename, "r")) == NULL)
1335 return 1;
1336
1337 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1338 if ((p = strchr(path, '\n')) != NULL)
1339 *p = 0;
1340 search_path = path;
1341 ret = scanelf_dir(path);
1342 }
1343 if (fp != stdin)
1344 fclose(fp);
1345 return ret;
1346 }
1347
1348 #if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1349
1350 static int load_ld_cache_config(int i, const char *fname)
1351 {
1352 FILE *fp = NULL;
1353 char *p;
1354 char path[__PAX_UTILS_PATH_MAX];
1355
1356 if (i + 1 == ARRAY_SIZE(ldpaths))
1357 return i;
1358
1359 if ((fp = fopen(fname, "r")) == NULL)
1360 return i;
1361
1362 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1363 if ((p = strrchr(path, '\r')) != NULL)
1364 *p = 0;
1365 if ((p = strchr(path, '\n')) != NULL)
1366 *p = 0;
1367 #ifdef __linux__
1368 // recursive includes of the same file will make this segfault.
1369 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1370 glob64_t gl;
1371 size_t x;
1372 char gpath[__PAX_UTILS_PATH_MAX];
1373
1374 memset(gpath, 0, sizeof(gpath));
1375
1376 if (path[8] != '/')
1377 snprintf(gpath, sizeof(gpath), "/etc/%s", &path[8]);
1378 else
1379 strncpy(gpath, &path[8], sizeof(gpath));
1380
1381 if ((glob64(gpath, 0, NULL, &gl)) == 0) {
1382 for (x = 0; x < gl.gl_pathc; ++x) {
1383 /* try to avoid direct loops */
1384 if (strcmp(gl.gl_pathv[x], fname) == 0)
1385 continue;
1386 i = load_ld_cache_config(i, gl.gl_pathv[x]);
1387 if (i + 1 >= ARRAY_SIZE(ldpaths)) {
1388 globfree64(&gl);
1389 return i;
1390 }
1391 }
1392 globfree64 (&gl);
1393 continue;
1394 }
1395 }
1396 #endif
1397 if (*path != '/')
1398 continue;
1399
1400 ldpaths[i++] = xstrdup(path);
1401
1402 if (i + 1 == ARRAY_SIZE(ldpaths))
1403 break;
1404 }
1405 ldpaths[i] = NULL;
1406
1407 fclose(fp);
1408 return i;
1409 }
1410
1411 #elif defined(__FreeBSD__) || (__DragonFly__)
1412
1413 static int load_ld_cache_config(int i, const char *fname)
1414 {
1415 FILE *fp = NULL;
1416 char *b = NULL, *p;
1417 struct elfhints_hdr hdr;
1418
1419 if (i + 1 == ARRAY_SIZE(ldpaths))
1420 return i;
1421
1422 if ((fp = fopen(fname, "r")) == NULL)
1423 return i;
1424
1425 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1426 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1427 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1428 {
1429 fclose(fp);
1430 return i;
1431 }
1432
1433 b = (char*)malloc(hdr.dirlistlen+1);
1434 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1435 fclose(fp);
1436 free(b);
1437 return i;
1438 }
1439
1440 while ((p = strsep(&b, ":"))) {
1441 if (*p == '\0') continue;
1442 ldpaths[i++] = xstrdup(p);
1443
1444 if (i + 1 == ARRAY_SIZE(ldpaths))
1445 break;
1446 }
1447 ldpaths[i] = NULL;
1448
1449 free(b);
1450 fclose(fp);
1451 return i;
1452 }
1453
1454 #else
1455
1456 #warning Cache config support not implemented for your target
1457 static int load_ld_cache_config(int i, const char *fname)
1458 {
1459 memset(ldpaths, 0x00, sizeof(ldpaths));
1460 }
1461
1462 #endif
1463
1464 /* scan /etc/ld.so.conf for paths */
1465 static void scanelf_ldpath()
1466 {
1467 char scan_l, scan_ul, scan_ull;
1468 int i = 0;
1469
1470 if (!ldpaths[0])
1471 err("Unable to load any paths from ld.so.conf");
1472
1473 scan_l = scan_ul = scan_ull = 0;
1474
1475 while (ldpaths[i]) {
1476 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
1477 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
1478 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
1479 scanelf_dir(ldpaths[i]);
1480 ++i;
1481 }
1482
1483 if (!scan_l) scanelf_dir("/lib");
1484 if (!scan_ul) scanelf_dir("/usr/lib");
1485 if (!scan_ull) scanelf_dir("/usr/local/lib");
1486 }
1487
1488 /* scan env PATH for paths */
1489 static void scanelf_envpath()
1490 {
1491 char *path, *p;
1492
1493 path = getenv("PATH");
1494 if (!path)
1495 err("PATH is not set in your env !");
1496 path = xstrdup(path);
1497
1498 while ((p = strrchr(path, ':')) != NULL) {
1499 scanelf_dir(p + 1);
1500 *p = 0;
1501 }
1502
1503 free(path);
1504 }
1505
1506 /* usage / invocation handling functions */
1507 #define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:BhV"
1508 #define a_argument required_argument
1509 static struct option const long_opts[] = {
1510 {"path", no_argument, NULL, 'p'},
1511 {"ldpath", no_argument, NULL, 'l'},
1512 {"recursive", no_argument, NULL, 'R'},
1513 {"mount", no_argument, NULL, 'm'},
1514 {"symlink", no_argument, NULL, 'y'},
1515 {"archives", no_argument, NULL, 'A'},
1516 {"ldcache", no_argument, NULL, 'L'},
1517 {"fix", no_argument, NULL, 'X'},
1518 {"setpax", a_argument, NULL, 'z'},
1519 {"pax", no_argument, NULL, 'x'},
1520 {"header", no_argument, NULL, 'e'},
1521 {"textrel", no_argument, NULL, 't'},
1522 {"rpath", no_argument, NULL, 'r'},
1523 {"needed", no_argument, NULL, 'n'},
1524 {"interp", no_argument, NULL, 'i'},
1525 {"bind", no_argument, NULL, 'b'},
1526 {"soname", no_argument, NULL, 'S'},
1527 {"symbol", a_argument, NULL, 's'},
1528 {"section", a_argument, NULL, 'k'},
1529 {"lib", a_argument, NULL, 'N'},
1530 {"gmatch", no_argument, NULL, 'g'},
1531 {"textrels", no_argument, NULL, 'T'},
1532 {"etype", a_argument, NULL, 'E'},
1533 {"bits", a_argument, NULL, 'M'},
1534 {"all", no_argument, NULL, 'a'},
1535 {"quiet", no_argument, NULL, 'q'},
1536 {"verbose", no_argument, NULL, 'v'},
1537 {"format", a_argument, NULL, 'F'},
1538 {"from", a_argument, NULL, 'f'},
1539 {"file", a_argument, NULL, 'o'},
1540 {"nobanner", no_argument, NULL, 'B'},
1541 {"help", no_argument, NULL, 'h'},
1542 {"version", no_argument, NULL, 'V'},
1543 {NULL, no_argument, NULL, 0x0}
1544 };
1545
1546 static const char *opts_help[] = {
1547 "Scan all directories in PATH environment",
1548 "Scan all directories in /etc/ld.so.conf",
1549 "Scan directories recursively",
1550 "Don't recursively cross mount points",
1551 "Don't scan symlinks",
1552 "Scan archives (.a files)",
1553 "Utilize ld.so.cache information (use with -r/-n)",
1554 "Try and 'fix' bad things (use with -r/-e)",
1555 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1556 "Print PaX markings",
1557 "Print GNU_STACK/PT_LOAD markings",
1558 "Print TEXTREL information",
1559 "Print RPATH information",
1560 "Print NEEDED information",
1561 "Print INTERP information",
1562 "Print BIND information",
1563 "Print SONAME information",
1564 "Find a specified symbol",
1565 "Find a specified section",
1566 "Find a specified library",
1567 "Use strncmp to match libraries. (use with -N)",
1568 "Locate cause of TEXTREL",
1569 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1570 "Print only ELF files matching numeric bits",
1571 "Print all scanned info (-x -e -t -r -b)\n",
1572 "Only output 'bad' things",
1573 "Be verbose (can be specified more than once)",
1574 "Use specified format for output",
1575 "Read input stream from a filename",
1576 "Write output stream to a filename",
1577 "Don't display the header",
1578 "Print this help and exit",
1579 "Print version and exit",
1580 NULL
1581 };
1582
1583 /* display usage and exit */
1584 static void usage(int status)
1585 {
1586 unsigned long i;
1587 printf("* Scan ELF binaries for stuff\n\n"
1588 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1589 printf("Options: -[%s]\n", PARSE_FLAGS);
1590 for (i = 0; long_opts[i].name; ++i)
1591 if (long_opts[i].has_arg == no_argument)
1592 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
1593 long_opts[i].name, opts_help[i]);
1594 else
1595 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
1596 long_opts[i].name, opts_help[i]);
1597
1598 if (status != EXIT_SUCCESS)
1599 exit(status);
1600
1601 puts("\nThe format modifiers for the -F option are:");
1602 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1603 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1604 puts(" i INTERP \tb BIND \ts symbol");
1605 puts(" N library \to Type \tT TEXTRELs");
1606 puts(" S SONAME \tk section \ta arch");
1607 puts(" p filename (with search path removed)");
1608 puts(" f filename (short name/basename)");
1609 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1610
1611 puts("\nELF Etypes:");
1612 print_etypes(stdout);
1613
1614 exit(status);
1615 }
1616
1617 /* parse command line arguments and preform needed actions */
1618 #define do_pax_state(option, flag) \
1619 if (islower(option)) { \
1620 flags &= ~PF_##flag; \
1621 flags |= PF_NO##flag; \
1622 } else { \
1623 flags &= ~PF_NO##flag; \
1624 flags |= PF_##flag; \
1625 }
1626 static int parseargs(int argc, char *argv[])
1627 {
1628 int i;
1629 const char *from_file = NULL;
1630 int ret = 0;
1631
1632 opterr = 0;
1633 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1634 switch (i) {
1635
1636 case 'V':
1637 printf("pax-utils-%s: %s compiled %s\n%s\n"
1638 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
1639 VERSION, __FILE__, __DATE__, rcsid, argv0);
1640 exit(EXIT_SUCCESS);
1641 break;
1642 case 'h': usage(EXIT_SUCCESS); break;
1643 case 'f':
1644 if (from_file) warn("You prob don't want to specify -f twice");
1645 from_file = optarg;
1646 break;
1647 case 'E':
1648 strncpy(match_etypes, optarg, sizeof(match_etypes));
1649 break;
1650 case 'M':
1651 match_bits = atoi(optarg);
1652 break;
1653 case 'o': {
1654 if (freopen(optarg, "w", stdout) == NULL)
1655 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1656 break;
1657 }
1658 case 'k':
1659 if (find_section) warn("You prob don't want to specify -k twice");
1660 find_section = optarg;
1661 break;
1662 case 's': {
1663 if (find_sym) warn("You prob don't want to specify -s twice");
1664 find_sym = optarg;
1665 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1666 sprintf(versioned_symname, "%s@", find_sym);
1667 break;
1668 }
1669 case 'N': {
1670 if (find_lib) warn("You prob don't want to specify -N twice");
1671 find_lib = optarg;
1672 break;
1673 }
1674
1675 case 'F': {
1676 if (out_format) warn("You prob don't want to specify -F twice");
1677 out_format = optarg;
1678 break;
1679 }
1680 case 'z': {
1681 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1682 size_t x;
1683
1684 for (x = 0 ; x < strlen(optarg); x++) {
1685 switch(optarg[x]) {
1686 case 'p':
1687 case 'P':
1688 do_pax_state(optarg[x], PAGEEXEC);
1689 break;
1690 case 's':
1691 case 'S':
1692 do_pax_state(optarg[x], SEGMEXEC);
1693 break;
1694 case 'm':
1695 case 'M':
1696 do_pax_state(optarg[x], MPROTECT);
1697 break;
1698 case 'e':
1699 case 'E':
1700 do_pax_state(optarg[x], EMUTRAMP);
1701 break;
1702 case 'r':
1703 case 'R':
1704 do_pax_state(optarg[x], RANDMMAP);
1705 break;
1706 case 'x':
1707 case 'X':
1708 do_pax_state(optarg[x], RANDEXEC);
1709 break;
1710 default:
1711 break;
1712 }
1713 }
1714 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
1715 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
1716 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
1717 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
1718 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1719 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1720 setpax = flags;
1721 break;
1722 }
1723 case 'g': gmatch = 1; break;
1724 case 'L': use_ldcache = 1; break;
1725 case 'y': scan_symlink = 0; break;
1726 case 'A': scan_archives = 1; break;
1727 case 'B': show_banner = 0; break;
1728 case 'l': scan_ldpath = 1; break;
1729 case 'p': scan_envpath = 1; break;
1730 case 'R': dir_recurse = 1; break;
1731 case 'm': dir_crossmount = 0; break;
1732 case 'X': ++fix_elf; break;
1733 case 'x': show_pax = 1; break;
1734 case 'e': show_phdr = 1; break;
1735 case 't': show_textrel = 1; break;
1736 case 'r': show_rpath = 1; break;
1737 case 'n': show_needed = 1; break;
1738 case 'i': show_interp = 1; break;
1739 case 'b': show_bind = 1; break;
1740 case 'S': show_soname = 1; break;
1741 case 'T': show_textrels = 1; break;
1742 case 'q': be_quiet = 1; break;
1743 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1744 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
1745
1746 case ':':
1747 err("Option '%c' is missing parameter", optopt);
1748 case '?':
1749 err("Unknown option '%c' or argument missing", optopt);
1750 default:
1751 err("Unhandled option '%c'; please report this", i);
1752 }
1753 }
1754
1755 /* let the format option override all other options */
1756 if (out_format) {
1757 show_pax = show_phdr = show_textrel = show_rpath = \
1758 show_needed = show_interp = show_bind = show_soname = \
1759 show_textrels = 0;
1760 for (i = 0; out_format[i]; ++i) {
1761 if (!IS_MODIFIER(out_format[i])) continue;
1762
1763 switch (out_format[++i]) {
1764 case '+': break;
1765 case '%': break;
1766 case '#': break;
1767 case 'F': break;
1768 case 'p': break;
1769 case 'f': break;
1770 case 'k': break;
1771 case 's': break;
1772 case 'N': break;
1773 case 'o': break;
1774 case 'a': break;
1775 case 'x': show_pax = 1; break;
1776 case 'e': show_phdr = 1; break;
1777 case 't': show_textrel = 1; break;
1778 case 'r': show_rpath = 1; break;
1779 case 'n': show_needed = 1; break;
1780 case 'i': show_interp = 1; break;
1781 case 'b': show_bind = 1; break;
1782 case 'S': show_soname = 1; break;
1783 case 'T': show_textrels = 1; break;
1784 default:
1785 err("Invalid format specifier '%c' (byte %i)",
1786 out_format[i], i+1);
1787 }
1788 }
1789
1790 /* construct our default format */
1791 } else {
1792 size_t fmt_len = 30;
1793 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
1794 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1795 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1796 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1797 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1798 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1799 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1800 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1801 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1802 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1803 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1804 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1805 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1806 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1807 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1808 }
1809 if (be_verbose > 2) printf("Format: %s\n", out_format);
1810
1811 /* now lets actually do the scanning */
1812 if (scan_ldpath || use_ldcache)
1813 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
1814 if (scan_ldpath) scanelf_ldpath();
1815 if (scan_envpath) scanelf_envpath();
1816 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
1817 from_file = "-";
1818 if (from_file) {
1819 scanelf_from_file(from_file);
1820 from_file = *argv;
1821 }
1822 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1823 err("Nothing to scan !?");
1824 while (optind < argc) {
1825 search_path = argv[optind++];
1826 ret = scanelf_dir(search_path);
1827 }
1828
1829 /* clean up */
1830 free(versioned_symname);
1831 for (i = 0; ldpaths[i]; ++i)
1832 free(ldpaths[i]);
1833
1834 if (ldcache != 0)
1835 munmap(ldcache, ldcache_size);
1836 return ret;
1837 }
1838
1839 static char **get_split_env(const char *envvar)
1840 {
1841 const char *delims = " \t\n";
1842 char **envvals = NULL;
1843 char *env, *s;
1844 int nentry;
1845
1846 if ((env = getenv(envvar)) == NULL)
1847 return NULL;
1848
1849 env = xstrdup(env);
1850 if (env == NULL)
1851 return NULL;
1852
1853 s = strtok(env, delims);
1854 if (s == NULL) {
1855 free(env);
1856 return NULL;
1857 }
1858
1859 nentry = 0;
1860 while (s != NULL) {
1861 ++nentry;
1862 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
1863 envvals[nentry-1] = s;
1864 s = strtok(NULL, delims);
1865 }
1866 envvals[nentry] = NULL;
1867
1868 /* don't want to free(env) as it contains the memory that backs
1869 * the envvals array of strings */
1870 return envvals;
1871 }
1872 static void parseenv()
1873 {
1874 qa_textrels = get_split_env("QA_TEXTRELS");
1875 qa_execstack = get_split_env("QA_EXECSTACK");
1876 qa_wx_load = get_split_env("QA_WX_LOAD");
1877 }
1878
1879 #ifdef __PAX_UTILS_CLEANUP
1880 static void cleanup()
1881 {
1882 free(out_format);
1883 free(qa_textrels);
1884 free(qa_execstack);
1885 free(qa_wx_load);
1886 }
1887 #endif
1888
1889
1890 int main(int argc, char *argv[])
1891 {
1892 int ret;
1893 if (argc < 2)
1894 usage(EXIT_FAILURE);
1895 parseenv();
1896 ret = parseargs(argc, argv);
1897 fclose(stdout);
1898 #ifdef __PAX_UTILS_CLEANUP
1899 cleanup();
1900 warn("The calls to add/delete heap should be off:\n"
1901 "\t- 1 due to the out_buffer not being freed in scanelf_file()\n"
1902 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
1903 #endif
1904 return ret;
1905 }
1906
1907
1908
1909 /* utility funcs */
1910 static char *xstrdup(const char *s)
1911 {
1912 char *ret = strdup(s);
1913 if (!ret) err("Could not strdup(): %s", strerror(errno));
1914 return ret;
1915 }
1916 static void *xmalloc(size_t size)
1917 {
1918 void *ret = malloc(size);
1919 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1920 return ret;
1921 }
1922 static void *xrealloc(void *ptr, size_t size)
1923 {
1924 void *ret = realloc(ptr, size);
1925 if (!ret) err("Could not realloc() %li bytes", (unsigned long)size);
1926 return ret;
1927 }
1928 static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
1929 {
1930 size_t new_len;
1931
1932 new_len = strlen(*dst) + strlen(src);
1933 if (*curr_len <= new_len) {
1934 *curr_len = new_len + (*curr_len / 2);
1935 *dst = realloc(*dst, *curr_len);
1936 if (!*dst)
1937 err("could not realloc() %li bytes", (unsigned long)*curr_len);
1938 }
1939
1940 if (n)
1941 strncat(*dst, src, n);
1942 else
1943 strcat(*dst, src);
1944 }
1945 static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1946 {
1947 static char my_app[2];
1948 my_app[0] = append;
1949 my_app[1] = '\0';
1950 xstrcat(dst, my_app, curr_len);
1951 }
1952
1953 /* Match filename against entries in matchlist, return TRUE
1954 * if the file is listed */
1955 static int file_matches_list(const char *filename, char **matchlist)
1956 {
1957 char **file;
1958 char *match;
1959 char buf[__PAX_UTILS_PATH_MAX];
1960
1961 if (matchlist == NULL)
1962 return 0;
1963
1964 for (file = matchlist; *file != NULL; file++) {
1965 if (search_path) {
1966 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
1967 match = buf;
1968 } else {
1969 match = *file;
1970 }
1971 if (fnmatch(match, filename, 0) == 0)
1972 return 1;
1973 }
1974 return 0;
1975 }

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