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Revision 1.40 Revision 1.275
1/* 1/*
2 * Copyright 2003 Ned Ludd <solar@gentoo.org>
3 * Copyright 1999-2005 Gentoo Foundation 2 * Copyright 2003-2012 Gentoo Foundation
4 * Distributed under the terms of the GNU General Public License v2 3 * Distributed under the terms of the GNU General Public License v2
5 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.40 2005/04/21 00:13:03 solar Exp $ 4 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.275 2015/02/24 06:58:39 vapier Exp $
6 * 5 *
7 ******************************************************************** 6 * Copyright 2003-2012 Ned Ludd - <solar@gentoo.org>
8 * This program is free software; you can redistribute it and/or 7 * Copyright 2004-2012 Mike Frysinger - <vapier@gentoo.org>
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of the
11 * License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
21 * MA 02111-1307, USA.
22 */ 8 */
23 9
24#include <stdio.h> 10static const char rcsid[] = "$Id: scanelf.c,v 1.275 2015/02/24 06:58:39 vapier Exp $";
25#include <stdlib.h> 11const char argv0[] = "scanelf";
26#include <sys/types.h>
27#define __USE_GNU
28#include <string.h>
29#include <errno.h>
30#include <unistd.h>
31#include <sys/stat.h>
32#include <dirent.h>
33#include <getopt.h>
34#include <assert.h>
35 12
36#include "paxelf.h" 13#include "paxinc.h"
37 14
38static const char *rcsid = "$Id: scanelf.c,v 1.40 2005/04/21 00:13:03 solar Exp $"; 15#define IS_MODIFIER(c) (c == '%' || c == '#' || c == '+')
39#define argv0 "scanelf"
40
41
42 16
43/* prototypes */ 17/* prototypes */
44static void scanelf_file(const char *filename); 18static int file_matches_list(const char *filename, char **matchlist);
45static void scanelf_dir(const char *path);
46static void scanelf_ldpath();
47static void scanelf_envpath();
48static void usage(int status);
49static void parseargs(int argc, char *argv[]);
50 19
51/* variables to control behavior */ 20/* variables to control behavior */
21static array_t _match_etypes = array_init_decl, *match_etypes = &_match_etypes;
22static array_t _ldpaths = array_init_decl, *ldpaths = &_ldpaths;
52static char scan_ldpath = 0; 23static char scan_ldpath = 0;
53static char scan_envpath = 0; 24static char scan_envpath = 0;
54static char scan_symlink = 1; 25static char scan_symlink = 1;
26static char scan_archives = 0;
55static char dir_recurse = 0; 27static char dir_recurse = 0;
56static char dir_crossmount = 1; 28static char dir_crossmount = 1;
57static char show_pax = 0; 29static char show_pax = 0;
30static char show_perms = 0;
58static char show_stack = 0; 31static char show_size = 0;
32static char show_phdr = 0;
59static char show_textrel = 0; 33static char show_textrel = 0;
60static char show_rpath = 0; 34static char show_rpath = 0;
61static char show_needed = 0; 35static char show_needed = 0;
62static char show_interp = 0; 36static char show_interp = 0;
37static char show_bind = 0;
38static char show_soname = 0;
39static char show_textrels = 0;
63static char show_banner = 1; 40static char show_banner = 1;
41static char show_endian = 0;
42static char show_osabi = 0;
43static char show_eabi = 0;
64static char be_quiet = 0; 44static char be_quiet = 0;
65static char be_verbose = 0; 45static char be_verbose = 0;
66static char *find_sym = NULL, *versioned_symname = NULL; 46static char be_wewy_wewy_quiet = 0;
47static char be_semi_verbose = 0;
48static char *find_sym = NULL;
49static array_t _find_sym_arr = array_init_decl, *find_sym_arr = &_find_sym_arr;
50static array_t _find_sym_regex_arr = array_init_decl, *find_sym_regex_arr = &_find_sym_regex_arr;
51static char *find_lib = NULL;
52static array_t _find_lib_arr = array_init_decl, *find_lib_arr = &_find_lib_arr;
53static char *find_section = NULL;
54static array_t _find_section_arr = array_init_decl, *find_section_arr = &_find_section_arr;
67static char *out_format = NULL; 55static char *out_format = NULL;
56static char *search_path = NULL;
57static char fix_elf = 0;
58static char g_match = 0;
59static char use_ldcache = 0;
60static char use_ldpath = 0;
68 61
62static char **qa_textrels = NULL;
63static char **qa_execstack = NULL;
64static char **qa_wx_load = NULL;
65static int root_fd = AT_FDCWD;
69 66
67static int match_bits = 0;
68static unsigned int match_perms = 0;
69static void *ldcache = NULL;
70static size_t ldcache_size = 0;
71static unsigned long setpax = 0UL;
70 72
73static const char *objdump;
74
75/* Find the path to a file by name. Note: we do not currently handle the
76 * empty path element correctly (should behave by searching $PWD). */
77static const char *which(const char *fname, const char *envvar)
78{
79 size_t path_len, fname_len;
80 const char *env_path;
81 char *path, *p, *ep;
82
83 p = getenv(envvar);
84 if (p)
85 return p;
86
87 env_path = getenv("PATH");
88 if (!env_path)
89 return NULL;
90
91 /* Create a copy of the $PATH that we can safely modify.
92 * Make it a little bigger so we can append "/fname".
93 * We do this twice -- once for a perm copy, and once for
94 * room at the end of the last element. */
95 path_len = strlen(env_path);
96 fname_len = strlen(fname);
97 path = xmalloc(path_len + (fname_len * 2) + 2 + 2);
98 memcpy(path, env_path, path_len + 1);
99
100 p = path + path_len + 1 + fname_len + 1;
101 *p = '/';
102 memcpy(p + 1, fname, fname_len + 1);
103
104 /* Repoint fname to the copy in the env string as it has
105 * the leading slash which we can include in a single memcpy.
106 * Increase the fname len to include the '/' and '\0'. */
107 fname = p;
108 fname_len += 2;
109
110 p = path;
111 while (p) {
112 ep = strchr(p, ':');
113 /* Append the /foo path to the current element. */
114 if (ep)
115 memcpy(ep, fname, fname_len);
116 else
117 memcpy(path + path_len, fname, fname_len);
118
119 if (access(p, R_OK) != -1)
120 return p;
121
122 p = ep;
123 if (ep) {
124 /* If not the last element, restore the chunk we clobbered. */
125 size_t offset = ep - path;
126 size_t restore = min(path_len - offset, fname_len);
127 memcpy(ep, env_path + offset, restore);
128 ++p;
129 }
130 }
131
132 free(path);
133 return NULL;
134}
135
136static FILE *fopenat_r(int dir_fd, const char *path)
137{
138 int fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
139 if (fd == -1)
140 return NULL;
141 return fdopen(fd, "re");
142}
143
144static const char *root_rel_path(const char *path)
145{
146 /*
147 * openat() will ignore the dirfd if path starts with
148 * a /, so consume all of that noise
149 *
150 * XXX: we don't handle relative paths like ../ that
151 * break out of the --root option, but for now, just
152 * don't do that :P.
153 */
154 if (root_fd != AT_FDCWD) {
155 while (*path == '/')
156 ++path;
157 if (*path == '\0')
158 path = ".";
159 }
160
161 return path;
162}
163
71/* sub-funcs for scanelf_file() */ 164/* sub-funcs for scanelf_fileat() */
165static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **str)
166{
167 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
168
169 /* debug sections */
170 void *symtab = elf_findsecbyname(elf, ".symtab");
171 void *strtab = elf_findsecbyname(elf, ".strtab");
172 /* runtime sections */
173 void *dynsym = elf_findsecbyname(elf, ".dynsym");
174 void *dynstr = elf_findsecbyname(elf, ".dynstr");
175
176 /*
177 * If the sections are marked NOBITS, then they don't exist, so we just
178 * skip them. This let's us work sanely with splitdebug ELFs (rather
179 * than spewing a lot of "corrupt ELF" messages later on). In malformed
180 * ELFs, the section might be wrongly set to NOBITS, but screw em.
181 *
182 * We need to make sure the debug/runtime sym/str sets are used together
183 * as they are generated in sync. Trying to mix them won't work.
184 */
185#define GET_SYMTABS(B) \
186 if (elf->elf_class == ELFCLASS ## B) { \
187 Elf ## B ## _Shdr *esymtab = symtab; \
188 Elf ## B ## _Shdr *estrtab = strtab; \
189 Elf ## B ## _Shdr *edynsym = dynsym; \
190 Elf ## B ## _Shdr *edynstr = dynstr; \
191 \
192 if (symtab && EGET(esymtab->sh_type) == SHT_NOBITS) \
193 symtab = NULL; \
194 if (dynsym && EGET(edynsym->sh_type) == SHT_NOBITS) \
195 dynsym = NULL; \
196 if (strtab && EGET(estrtab->sh_type) == SHT_NOBITS) \
197 strtab = NULL; \
198 if (dynstr && EGET(edynstr->sh_type) == SHT_NOBITS) \
199 dynstr = NULL; \
200 \
201 /* Use the set with more symbols if both exist. */ \
202 if (symtab && dynsym && strtab && dynstr) { \
203 if (EGET(esymtab->sh_size) > EGET(edynsym->sh_size)) \
204 goto debug##B; \
205 else \
206 goto runtime##B; \
207 } else if (symtab && strtab) { \
208 debug##B: \
209 *sym = symtab; \
210 *str = strtab; \
211 return; \
212 } else if (dynsym && dynstr) { \
213 runtime##B: \
214 *sym = dynsym; \
215 *str = dynstr; \
216 return; \
217 } else { \
218 *sym = *str = NULL; \
219 } \
220 }
221 GET_SYMTABS(32)
222 GET_SYMTABS(64)
223
224 if (*sym && *str)
225 return;
226
227 /*
228 * damn, they're really going to make us work for it huh?
229 * reconstruct the section header info out of the dynamic
230 * tags so we can see what symbols this guy uses at runtime.
231 */
232 if (!elf->phdr)
233 return;
234#define GET_SYMTABS_DT(B) \
235 if (elf->elf_class == ELFCLASS ## B) { \
236 size_t i; \
237 static Elf ## B ## _Shdr sym_shdr, str_shdr; \
238 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
239 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
240 Elf ## B ## _Addr vsym, vstr, vhash, vgnu_hash; \
241 Elf ## B ## _Dyn *dyn; \
242 Elf ## B ## _Off offset; \
243 \
244 /* lookup symbols used at runtime with DT_SYMTAB / DT_STRTAB */ \
245 vsym = vstr = vhash = vgnu_hash = 0; \
246 memset(&sym_shdr, 0, sizeof(sym_shdr)); \
247 memset(&str_shdr, 0, sizeof(str_shdr)); \
248 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
249 if (EGET(phdr[i].p_type) != PT_DYNAMIC) \
250 continue; \
251 \
252 offset = EGET(phdr[i].p_offset); \
253 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
254 continue; \
255 \
256 dyn = DYN ## B (elf->vdata + offset); \
257 while (EGET(dyn->d_tag) != DT_NULL) { \
258 switch (EGET(dyn->d_tag)) { \
259 case DT_SYMTAB: vsym = EGET(dyn->d_un.d_val); break; \
260 case DT_SYMENT: sym_shdr.sh_entsize = dyn->d_un.d_val; break; \
261 case DT_STRTAB: vstr = EGET(dyn->d_un.d_val); break; \
262 case DT_STRSZ: str_shdr.sh_size = dyn->d_un.d_val; break; \
263 case DT_HASH: vhash = EGET(dyn->d_un.d_val); break; \
264 /*case DT_GNU_HASH: vgnu_hash = EGET(dyn->d_un.d_val); break;*/ \
265 } \
266 ++dyn; \
267 } \
268 if (vsym && vstr) \
269 break; \
270 } \
271 if (!vsym || !vstr || !(vhash || vgnu_hash)) \
272 return; \
273 \
274 /* calc offset into the ELF by finding the load addr of the syms */ \
275 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
276 Elf ## B ## _Addr vaddr = EGET(phdr[i].p_vaddr); \
277 Elf ## B ## _Addr filesz = EGET(phdr[i].p_filesz); \
278 offset = EGET(phdr[i].p_offset); \
279 \
280 if (EGET(phdr[i].p_type) != PT_LOAD) \
281 continue; \
282 \
283 if (vhash >= vaddr && vhash < vaddr + filesz) { \
284 /* Scan the hash table to see how many entries we have */ \
285 Elf32_Word max_sym_idx = 0; \
286 Elf32_Word *hashtbl = elf->vdata + offset + (vhash - vaddr); \
287 Elf32_Word b, nbuckets = EGET(hashtbl[0]); \
288 Elf32_Word nchains = EGET(hashtbl[1]); \
289 Elf32_Word *buckets = &hashtbl[2]; \
290 Elf32_Word *chains = &buckets[nbuckets]; \
291 Elf32_Word sym_idx; \
292 Elf32_Word chained; \
293 \
294 for (b = 0; b < nbuckets; ++b) { \
295 if (!buckets[b]) \
296 continue; \
297 for (sym_idx = buckets[b], chained = 0; \
298 sym_idx < nchains && sym_idx && chained <= nchains; \
299 sym_idx = chains[sym_idx], ++chained) { \
300 if (max_sym_idx < sym_idx) \
301 max_sym_idx = sym_idx; \
302 } \
303 if (chained > nchains) { \
304 warnf("corrupt ELF bucket"); \
305 break; \
306 } \
307 } \
308 ESET(sym_shdr.sh_size, sym_shdr.sh_entsize * max_sym_idx); \
309 } \
310 \
311 if (vsym >= vaddr && vsym < vaddr + filesz) { \
312 ESET(sym_shdr.sh_offset, offset + (vsym - vaddr)); \
313 *sym = &sym_shdr; \
314 } \
315 \
316 if (vstr >= vaddr && vstr < vaddr + filesz) { \
317 ESET(str_shdr.sh_offset, offset + (vstr - vaddr)); \
318 *str = &str_shdr; \
319 } \
320 } \
321 }
322 GET_SYMTABS_DT(32)
323 GET_SYMTABS_DT(64)
324}
325
72static void scanelf_file_pax(elfobj *elf, char *found_pax) 326static char *scanelf_file_pax(elfobj *elf, char *found_pax)
73{ 327{
74 char *paxflags; 328 static char ret[7];
329 unsigned long i, shown;
330
75 if (!show_pax) return; 331 if (!show_pax) return NULL;
76 332
77 paxflags = pax_short_hf_flags(PAX_FLAGS(elf)); 333 shown = 0;
78 if (!be_quiet || (be_quiet && strncmp(paxflags, "PeMRxS", 6))) { 334 memset(&ret, 0, sizeof(ret));
79 *found_pax = 1; 335
80 printf("%s ", pax_short_hf_flags(PAX_FLAGS(elf))); 336 if (elf->phdr) {
81 }
82}
83static void scanelf_file_stack(elfobj *elf, char *found_stack, char *found_relro)
84{
85 int i;
86 if (!show_stack) return;
87#define SHOW_STACK(B) \ 337#define SHOW_PAX(B) \
88 if (elf->elf_class == ELFCLASS ## B) { \ 338 if (elf->elf_class == ELFCLASS ## B) { \
89 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 339 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
90 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 340 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
91 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 341 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
92 if (EGET(phdr[i].p_type) != PT_GNU_STACK && \ 342 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
93 EGET(phdr[i].p_type) != PT_GNU_RELRO) continue; \
94 if (be_quiet && !(EGET(phdr[i].p_flags) & PF_X)) \
95 continue; \ 343 continue; \
96 if (EGET(phdr[i].p_type) == PT_GNU_STACK) \ 344 if (fix_elf && setpax) { \
345 /* set the paxctl flags */ \
346 ESET(phdr[i].p_flags, setpax); \
347 } \
348 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
349 continue; \
350 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
97 *found_stack = 1; \ 351 *found_pax = 1; \
98 if (EGET(phdr[i].p_type) == PT_GNU_RELRO) \ 352 ++shown; \
99 *found_relro = 1; \ 353 break; \
100 printf("%s ", gnu_short_stack_flags(EGET(phdr[i].p_flags))); \
101 } \ 354 } \
102 } 355 }
103 SHOW_STACK(32) 356 SHOW_PAX(32)
104 SHOW_STACK(64) 357 SHOW_PAX(64)
105 if (!be_quiet && !*found_stack) printf("--- "); 358 }
106 if (!be_quiet && !*found_relro) printf("--- "); 359
360 /* Note: We do not support setting EI_PAX if not PT_PAX_FLAGS
361 * was found. This is known to break ELFs on glibc systems,
362 * and mainline PaX has deprecated use of this for a long time.
363 * We could support changing PT_GNU_STACK, but that doesn't
364 * seem like it's worth the effort. #411919
365 */
366
367 /* fall back to EI_PAX if no PT_PAX was found */
368 if (!*ret) {
369 static char *paxflags;
370 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
371 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
372 *found_pax = 1;
373 return (be_wewy_wewy_quiet ? NULL : paxflags);
374 }
375 strncpy(ret, paxflags, sizeof(ret));
376 }
377
378 if (be_wewy_wewy_quiet || (be_quiet && !shown))
379 return NULL;
380 else
381 return ret;
107} 382}
383
384static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
385{
386 static char ret[12];
387 char *found;
388 unsigned long i, shown, multi_stack, multi_relro, multi_load;
389
390 if (!show_phdr) return NULL;
391
392 memcpy(ret, "--- --- ---\0", 12);
393
394 shown = 0;
395 multi_stack = multi_relro = multi_load = 0;
396
397#define NOTE_GNU_STACK ".note.GNU-stack"
398#define SHOW_PHDR(B) \
399 if (elf->elf_class == ELFCLASS ## B) { \
400 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
401 Elf ## B ## _Off offset; \
402 uint32_t flags, check_flags; \
403 if (elf->phdr != NULL) { \
404 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
405 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
406 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
407 if (multi_stack++) \
408 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
409 if (file_matches_list(elf->filename, qa_execstack)) \
410 continue; \
411 found = found_phdr; \
412 offset = 0; \
413 check_flags = PF_X; \
414 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
415 if (multi_relro++) \
416 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
417 found = found_relro; \
418 offset = 4; \
419 check_flags = PF_X; \
420 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
421 if (file_matches_list(elf->filename, qa_wx_load)) \
422 continue; \
423 found = found_load; \
424 offset = 8; \
425 check_flags = PF_W|PF_X; \
426 } else \
427 continue; \
428 flags = EGET(phdr[i].p_flags); \
429 if (be_quiet && ((flags & check_flags) != check_flags)) \
430 continue; \
431 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
432 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
433 ret[3] = ret[7] = '!'; \
434 flags = EGET(phdr[i].p_flags); \
435 } \
436 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
437 *found = 1; \
438 ++shown; \
439 } \
440 } else if (elf->shdr != NULL) { \
441 /* no program headers which means this is prob an object file */ \
442 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
443 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
444 if ((void*)strtbl > elf->data_end) \
445 goto skip_this_shdr##B; \
446 /* let's flag -w/+x object files since the final ELF will most likely \
447 * need write access to the stack (who doesn't !?). so the combined \
448 * output will bring in +w automatically and that's bad. \
449 */ \
450 check_flags = /*SHF_WRITE|*/SHF_EXECINSTR; \
451 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
452 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
453 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
454 if (offset >= elf->len - sizeof(NOTE_GNU_STACK)) \
455 continue; \
456 if (!strcmp(elf->data + offset, NOTE_GNU_STACK)) { \
457 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
458 flags = EGET(shdr[i].sh_flags); \
459 if (be_quiet && ((flags & check_flags) != check_flags)) \
460 continue; \
461 ++*found_phdr; \
462 shown = 1; \
463 if (flags & SHF_WRITE) ret[0] = 'W'; \
464 if (flags & SHF_ALLOC) ret[1] = 'A'; \
465 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
466 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
467 break; \
468 } \
469 } \
470 skip_this_shdr##B: \
471 if (!multi_stack) { \
472 if (file_matches_list(elf->filename, qa_execstack)) \
473 return NULL; \
474 *found_phdr = 1; \
475 shown = 1; \
476 memcpy(ret, "!WX", 3); \
477 } \
478 } \
479 }
480 SHOW_PHDR(32)
481 SHOW_PHDR(64)
482
483 if (be_wewy_wewy_quiet || (be_quiet && !shown))
484 return NULL;
485 else
486 return ret;
487}
488
489/*
490 * See if this ELF contains a DT_TEXTREL tag in any of its
491 * PT_DYNAMIC sections.
492 */
108static void scanelf_file_textrel(elfobj *elf, char *found_textrel) 493static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
109{ 494{
110 int i; 495 static const char *ret = "TEXTREL";
111 if (!show_textrel) return; 496 unsigned long i;
497
498 if (!show_textrel && !show_textrels) return NULL;
499
500 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
501
502 if (elf->phdr) {
112#define SHOW_TEXTREL(B) \ 503#define SHOW_TEXTREL(B) \
113 if (elf->elf_class == ELFCLASS ## B) { \ 504 if (elf->elf_class == ELFCLASS ## B) { \
114 Elf ## B ## _Dyn *dyn; \ 505 Elf ## B ## _Dyn *dyn; \
115 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 506 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
116 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 507 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
508 Elf ## B ## _Off offset; \
117 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 509 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
118 if (phdr[i].p_type != PT_DYNAMIC) continue; \ 510 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
511 offset = EGET(phdr[i].p_offset); \
512 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
119 dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \ 513 dyn = DYN ## B (elf->vdata + offset); \
120 while (EGET(dyn->d_tag) != DT_NULL) { \ 514 while (EGET(dyn->d_tag) != DT_NULL) { \
121 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \ 515 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
122 *found_textrel = 1; \ 516 *found_textrel = 1; \
123 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \ 517 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
124 printf("TEXTREL "); \ 518 return (be_wewy_wewy_quiet ? NULL : ret); \
125 } \ 519 } \
126 ++dyn; \ 520 ++dyn; \
127 } \ 521 } \
128 } } 522 } }
129 SHOW_TEXTREL(32) 523 SHOW_TEXTREL(32)
130 SHOW_TEXTREL(64) 524 SHOW_TEXTREL(64)
131 if (!be_quiet && !*found_textrel) printf("------- "); 525 }
526
527 if (be_quiet || be_wewy_wewy_quiet)
528 return NULL;
529 else
530 return " - ";
132} 531}
532
533/*
534 * Scan the .text section to see if there are any relocations in it.
535 * Should rewrite this to check PT_LOAD sections that are marked
536 * Executable rather than the section named '.text'.
537 */
538static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
539{
540 unsigned long s, r, rmax;
541 void *symtab_void, *strtab_void, *text_void;
542
543 if (!show_textrels) return NULL;
544
545 /* don't search for TEXTREL's if the ELF doesn't have any */
546 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
547 if (!*found_textrel) return NULL;
548
549 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
550 text_void = elf_findsecbyname(elf, ".text");
551
552 if (symtab_void && strtab_void && text_void && elf->shdr) {
553#define SHOW_TEXTRELS(B) \
554 if (elf->elf_class == ELFCLASS ## B) { \
555 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
556 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
557 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
558 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
559 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
560 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
561 uint ## B ## _t memsz = EGET(text->sh_size); \
562 Elf ## B ## _Rel *rel; \
563 Elf ## B ## _Rela *rela; \
564 /* search the section headers for relocations */ \
565 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
566 uint32_t sh_type = EGET(shdr[s].sh_type); \
567 if (sh_type == SHT_REL) { \
568 rel = REL ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
569 rela = NULL; \
570 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
571 } else if (sh_type == SHT_RELA) { \
572 rel = NULL; \
573 rela = RELA ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
574 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
575 } else \
576 continue; \
577 /* now see if any of the relocs are in the .text */ \
578 for (r = 0; r < rmax; ++r) { \
579 unsigned long sym_max; \
580 Elf ## B ## _Addr offset_tmp; \
581 Elf ## B ## _Sym *func; \
582 Elf ## B ## _Sym *sym; \
583 Elf ## B ## _Addr r_offset; \
584 uint ## B ## _t r_info; \
585 if (sh_type == SHT_REL) { \
586 r_offset = EGET(rel[r].r_offset); \
587 r_info = EGET(rel[r].r_info); \
588 } else { \
589 r_offset = EGET(rela[r].r_offset); \
590 r_info = EGET(rela[r].r_info); \
591 } \
592 /* make sure this relocation is inside of the .text */ \
593 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
594 if (be_verbose <= 2) continue; \
595 } else \
596 *found_textrels = 1; \
597 /* locate this relocation symbol name */ \
598 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
599 if ((void*)sym > elf->data_end) { \
600 warn("%s: corrupt ELF symbol", elf->filename); \
601 continue; \
602 } \
603 sym_max = ELF ## B ## _R_SYM(r_info); \
604 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
605 sym += sym_max; \
606 else \
607 sym = NULL; \
608 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
609 /* show the raw details about this reloc */ \
610 printf(" %s: ", elf->base_filename); \
611 if (sym && sym->st_name) \
612 printf("%s", elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
613 else \
614 printf("(memory/data?)"); \
615 printf(" [0x%lX]", (unsigned long)r_offset); \
616 /* now try to find the closest symbol that this rel is probably in */ \
617 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
618 func = NULL; \
619 offset_tmp = 0; \
620 while (sym_max--) { \
621 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
622 func = sym; \
623 offset_tmp = EGET(sym->st_value); \
624 } \
625 ++sym; \
626 } \
627 printf(" in "); \
628 if (func && func->st_name) { \
629 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
630 if (r_offset > EGET(func->st_size)) \
631 printf("(optimized out: previous %s)", func_name); \
632 else \
633 printf("%s", func_name); \
634 } else \
635 printf("(optimized out)"); \
636 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
637 if (be_verbose && objdump) { \
638 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
639 char *sysbuf; \
640 size_t syslen; \
641 const char sysfmt[] = "%s -r -R -d -w -l --start-address=0x%lX --stop-address=0x%lX %s | grep --color -i -C 3 '.*[[:space:]]%lX:[[:space:]]*R_.*'\n"; \
642 syslen = sizeof(sysfmt) + strlen(objdump) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
643 sysbuf = xmalloc(syslen); \
644 if (end_addr < r_offset) \
645 /* not uncommon when things are optimized out */ \
646 end_addr = r_offset + 0x100; \
647 snprintf(sysbuf, syslen, sysfmt, \
648 objdump, \
649 (unsigned long)offset_tmp, \
650 (unsigned long)end_addr, \
651 elf->filename, \
652 (unsigned long)r_offset); \
653 fflush(stdout); \
654 if (system(sysbuf)) {/* don't care */} \
655 fflush(stdout); \
656 free(sysbuf); \
657 } \
658 } \
659 } }
660 SHOW_TEXTRELS(32)
661 SHOW_TEXTRELS(64)
662 }
663 if (!*found_textrels)
664 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
665
666 return NULL;
667}
668
669static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
670{
671 struct stat st;
672 switch (*item) {
673 case '/': break;
674 case '.':
675 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
676 break;
677 case ':':
678 case '\0':
679 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
680 break;
681 case '$':
682 if (fstat(elf->fd, &st) != -1)
683 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
684 warnf("Security problem with %s='%s' in %s with mode set of %o",
685 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
686 break;
687 default:
688 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
689 break;
690 }
691 if (fix_elf)
692 warnf("Note: RPATH has been automatically fixed, but this should be fixed in the package itself");
693}
133static void scanelf_file_rpath(elfobj *elf, char *found_rpath) 694static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
134{ 695{
135 /* TODO: if be_quiet, only output RPATH's which aren't in /etc/ld.so.conf */ 696 unsigned long i;
136 int i;
137 char *rpath, *runpath; 697 char *rpath, *runpath, **r;
138 void *strtbl_void; 698 void *strtbl_void;
139 699
140 if (!show_rpath) return; 700 if (!show_rpath) return;
141 701
142 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 702 strtbl_void = elf_findsecbyname(elf, ".dynstr");
143 rpath = runpath = NULL; 703 rpath = runpath = NULL;
144 704
145 if (strtbl_void) { 705 if (elf->phdr && strtbl_void) {
146#define SHOW_RPATH(B) \ 706#define SHOW_RPATH(B) \
147 if (elf->elf_class == ELFCLASS ## B) { \ 707 if (elf->elf_class == ELFCLASS ## B) { \
148 Elf ## B ## _Dyn *dyn; \ 708 Elf ## B ## _Dyn *dyn; \
149 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 709 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
150 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 710 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
151 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 711 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
712 Elf ## B ## _Off offset; \
713 Elf ## B ## _Xword word; \
714 /* Scan all the program headers */ \
152 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 715 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
716 /* Just scan dynamic headers */ \
153 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 717 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
718 offset = EGET(phdr[i].p_offset); \
719 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
720 /* Just scan dynamic RPATH/RUNPATH headers */ \
154 dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \ 721 dyn = DYN ## B (elf->vdata + offset); \
155 while (EGET(dyn->d_tag) != DT_NULL) { \ 722 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
156 if (EGET(dyn->d_tag) == DT_RPATH) { \ 723 if (word == DT_RPATH) { \
724 r = &rpath; \
725 } else if (word == DT_RUNPATH) { \
726 r = &runpath; \
727 } else { \
728 ++dyn; \
729 continue; \
730 } \
731 /* Verify the memory is somewhat sane */ \
157 rpath = elf->data + EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 732 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
733 if (offset < (Elf ## B ## _Off)elf->len) { \
734 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
735 *r = elf->data + offset; \
736 /* cache the length in case we need to nuke this section later on */ \
737 if (fix_elf) \
738 offset = strlen(*r); \
739 /* If quiet, don't output paths in ld.so.conf */ \
740 if (be_quiet) { \
741 size_t len; \
742 char *start, *end; \
743 /* note that we only 'chop' off leading known paths. */ \
744 /* since *r is read-only memory, we can only move the ptr forward. */ \
745 start = *r; \
746 /* scan each path in : delimited list */ \
747 while (start) { \
748 rpath_security_checks(elf, start, get_elfdtype(word)); \
749 end = strchr(start, ':'); \
750 len = (end ? abs(end - start) : strlen(start)); \
751 if (use_ldcache) { \
752 size_t n; \
753 const char *ldpath; \
754 array_for_each(ldpaths, n, ldpath) \
755 if (!strncmp(ldpath, start, len) && !ldpath[len]) { \
756 *r = end; \
757 /* corner case ... if RPATH reads "/usr/lib:", we want \
758 * to show ':' rather than '' */ \
759 if (end && end[1] != '\0') \
760 (*r)++; \
761 break; \
762 } \
763 } \
764 if (!*r || !end) \
765 break; \
766 else \
767 start = start + len + 1; \
768 } \
769 } \
770 if (*r) { \
771 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
772 /* just nuke it */ \
773 nuke_it##B: \
774 memset(*r, 0x00, offset); \
775 *r = NULL; \
776 ESET(dyn->d_tag, DT_DEBUG); \
777 ESET(dyn->d_un.d_ptr, 0); \
778 } else if (fix_elf) { \
779 /* try to clean "bad" paths */ \
780 size_t len, tmpdir_len; \
781 char *start, *end; \
782 const char *tmpdir; \
783 start = *r; \
784 tmpdir = (getenv("TMPDIR") ? : "."); \
785 tmpdir_len = strlen(tmpdir); \
786 while (1) { \
787 end = strchr(start, ':'); \
788 if (start == end) { \
789 eat_this_path##B: \
790 len = strlen(end); \
791 memmove(start, end+1, len); \
792 start[len-1] = '\0'; \
793 end = start - 1; \
794 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
795 if (!end) { \
796 if (start == *r) \
797 goto nuke_it##B; \
798 *--start = '\0'; \
799 } else \
800 goto eat_this_path##B; \
801 } \
802 if (!end) \
803 break; \
804 start = end + 1; \
805 } \
806 if (**r == '\0') \
807 goto nuke_it##B; \
808 } \
809 if (*r) \
158 *found_rpath = 1; \ 810 *found_rpath = 1; \
159 } else if (EGET(dyn->d_tag) == DT_RUNPATH) { \ 811 } \
160 runpath = elf->data + EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
161 *found_rpath = 1; \
162 } \ 812 } \
163 ++dyn; \ 813 ++dyn; \
164 } \ 814 } \
165 } } 815 } }
166 SHOW_RPATH(32) 816 SHOW_RPATH(32)
167 SHOW_RPATH(64) 817 SHOW_RPATH(64)
168 } 818 }
819
820 if (be_wewy_wewy_quiet) return;
821
169 if (rpath && runpath) { 822 if (rpath && runpath) {
170 if (!strcmp(rpath, runpath)) 823 if (!strcmp(rpath, runpath)) {
171 printf("%-5s ", runpath); 824 xstrcat(ret, runpath, ret_len);
172 else { 825 } else {
173 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath); 826 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
174 printf("{%s,%s} ", rpath, runpath); 827 xchrcat(ret, '{', ret_len);
828 xstrcat(ret, rpath, ret_len);
829 xchrcat(ret, ',', ret_len);
830 xstrcat(ret, runpath, ret_len);
831 xchrcat(ret, '}', ret_len);
175 } 832 }
176 } else if (rpath || runpath) 833 } else if (rpath || runpath)
177 printf("%-5s ", (runpath ? runpath : rpath)); 834 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
178 else if (!be_quiet && !*found_rpath) 835 else if (!be_quiet)
179 printf(" - "); 836 xstrcat(ret, " - ", ret_len);
180} 837}
181static void scanelf_file_needed(elfobj *elf, char *found_needed) 838
839/* Defines can be seen in glibc's sysdeps/generic/ldconfig.h */
840#define LDSO_CACHE_MAGIC "ld.so-"
841#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
842#define LDSO_CACHE_VER "1.7.0"
843#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
844#define FLAG_ANY -1
845#define FLAG_TYPE_MASK 0x00ff
846#define FLAG_LIBC4 0x0000
847#define FLAG_ELF 0x0001
848#define FLAG_ELF_LIBC5 0x0002
849#define FLAG_ELF_LIBC6 0x0003
850#define FLAG_REQUIRED_MASK 0xff00
851#define FLAG_SPARC_LIB64 0x0100
852#define FLAG_IA64_LIB64 0x0200
853#define FLAG_X8664_LIB64 0x0300
854#define FLAG_S390_LIB64 0x0400
855#define FLAG_POWERPC_LIB64 0x0500
856#define FLAG_MIPS64_LIBN32 0x0600
857#define FLAG_MIPS64_LIBN64 0x0700
858#define FLAG_X8664_LIBX32 0x0800
859#define FLAG_ARM_LIBHF 0x0900
860#define FLAG_AARCH64_LIB64 0x0a00
861
862#if defined(__GLIBC__) || defined(__UCLIBC__)
863
864static char *lookup_cache_lib(elfobj *elf, const char *fname)
182{ 865{
183 int i; 866 int fd;
867 char *strs;
868 static char buf[__PAX_UTILS_PATH_MAX] = "";
869 const char *cachefile = root_rel_path("/etc/ld.so.cache");
870 struct stat st;
871
872 typedef struct {
873 char magic[LDSO_CACHE_MAGIC_LEN];
874 char version[LDSO_CACHE_VER_LEN];
875 int nlibs;
876 } header_t;
877 header_t *header;
878
879 typedef struct {
880 int flags;
881 int sooffset;
882 int liboffset;
883 } libentry_t;
884 libentry_t *libent;
885
886 if (fname == NULL)
887 return NULL;
888
889 if (ldcache == NULL) {
890 if (fstatat(root_fd, cachefile, &st, 0))
891 return NULL;
892
893 fd = openat(root_fd, cachefile, O_RDONLY);
894 if (fd == -1)
895 return NULL;
896
897 /* cache these values so we only map/unmap the cache file once */
898 ldcache_size = st.st_size;
899 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
900 close(fd);
901
902 if (ldcache == MAP_FAILED) {
903 ldcache = NULL;
904 return NULL;
905 }
906
907 if (memcmp(header->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN) ||
908 memcmp(header->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
909 {
910 munmap(ldcache, ldcache_size);
911 ldcache = NULL;
912 return NULL;
913 }
914 } else
915 header = ldcache;
916
917 libent = ldcache + sizeof(header_t);
918 strs = (char *) &libent[header->nlibs];
919
920 for (fd = 0; fd < header->nlibs; ++fd) {
921 /* This should be more fine grained, but for now we assume that
922 * diff arches will not be cached together, and we ignore the
923 * the different multilib mips cases.
924 */
925 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
926 continue;
927 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
928 continue;
929
930 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
931 continue;
932
933 /* Return first hit because that is how the ldso rolls */
934 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
935 break;
936 }
937
938 return buf;
939}
940
941#elif defined(__NetBSD__)
942static char *lookup_cache_lib(elfobj *elf, const char *fname)
943{
944 static char buf[__PAX_UTILS_PATH_MAX] = "";
945 static struct stat st;
946 size_t n;
947 char *ldpath;
948
949 array_for_each(ldpath, n, ldpath) {
950 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", ldpath, fname) >= sizeof(buf))
951 continue; /* if the pathname is too long, or something went wrong, ignore */
952
953 if (stat(buf, &st) != 0)
954 continue; /* if the lib doesn't exist in *ldpath, look further */
955
956 /* NetBSD doesn't actually do sanity checks, it just loads the file
957 * and if that doesn't work, continues looking in other directories.
958 * This cannot easily be safely emulated, unfortunately. For now,
959 * just assume that if it exists, it's a valid library. */
960
961 return buf;
962 }
963
964 /* not found in any path */
965 return NULL;
966}
967#else
968#ifdef __ELF__
969#warning Cache support not implemented for your target
970#endif
971static char *lookup_cache_lib(elfobj *elf, const char *fname)
972{
973 return NULL;
974}
975#endif
976
977static char *lookup_config_lib(const char *fname)
978{
979 static char buf[__PAX_UTILS_PATH_MAX] = "";
980 const char *ldpath;
981 size_t n;
982
983 array_for_each(ldpaths, n, ldpath) {
984 snprintf(buf, sizeof(buf), "%s/%s", root_rel_path(ldpath), fname);
985 if (faccessat(root_fd, buf, F_OK, AT_SYMLINK_NOFOLLOW) == 0)
986 return buf;
987 }
988
989 return NULL;
990}
991
992static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
993{
994 unsigned long i;
184 char *needed; 995 char *needed;
185 void *strtbl_void; 996 void *strtbl_void;
997 char *p;
186 998
187 if (!show_needed) return; 999 /*
1000 * -n -> op==0 -> print all
1001 * -N -> op==1 -> print requested
1002 */
1003 if ((op == 0 && !show_needed) || (op == 1 && !find_lib))
1004 return NULL;
188 1005
189 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 1006 strtbl_void = elf_findsecbyname(elf, ".dynstr");
190 1007
191 if (strtbl_void) { 1008 if (elf->phdr && strtbl_void) {
192#define SHOW_NEEDED(B) \ 1009#define SHOW_NEEDED(B) \
193 if (elf->elf_class == ELFCLASS ## B) { \ 1010 if (elf->elf_class == ELFCLASS ## B) { \
194 Elf ## B ## _Dyn *dyn; \ 1011 Elf ## B ## _Dyn *dyn; \
195 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 1012 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
196 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 1013 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
197 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 1014 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
1015 Elf ## B ## _Off offset; \
1016 size_t matched = 0; \
1017 /* Walk all the program headers to find the PT_DYNAMIC */ \
198 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 1018 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
199 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 1019 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) \
1020 continue; \
1021 offset = EGET(phdr[i].p_offset); \
1022 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
1023 continue; \
1024 /* Walk all the dynamic tags to find NEEDED entries */ \
200 dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \ 1025 dyn = DYN ## B (elf->vdata + offset); \
201 while (EGET(dyn->d_tag) != DT_NULL) { \ 1026 while (EGET(dyn->d_tag) != DT_NULL) { \
202 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 1027 if (EGET(dyn->d_tag) == DT_NEEDED) { \
203 needed = elf->data + EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 1028 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
204 if (*found_needed) printf(","); \ 1029 if (offset >= (Elf ## B ## _Off)elf->len) { \
205 printf("%s", needed); \ 1030 ++dyn; \
1031 continue; \
1032 } \
1033 needed = elf->data + offset; \
1034 if (op == 0) { \
1035 /* -n -> print all entries */ \
1036 if (!be_wewy_wewy_quiet) { \
1037 if (*found_needed) xchrcat(ret, ',', ret_len); \
1038 if (use_ldpath) { \
1039 if ((p = lookup_config_lib(needed)) != NULL) \
1040 needed = p; \
1041 } else if (use_ldcache) { \
1042 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
1043 needed = p; \
1044 } \
1045 xstrcat(ret, needed, ret_len); \
1046 } \
206 *found_needed = 1; \ 1047 *found_needed = 1; \
1048 } else { \
1049 /* -N -> print matching entries */ \
1050 size_t n; \
1051 const char *find_lib_name; \
1052 \
1053 array_for_each(find_lib_arr, n, find_lib_name) { \
1054 int invert = 1; \
1055 if (find_lib_name[0] == '!') \
1056 invert = 0, ++find_lib_name; \
1057 if (!strcmp(find_lib_name, needed) == invert) \
1058 ++matched; \
1059 } \
1060 \
1061 if (matched == array_cnt(find_lib_arr)) { \
1062 *found_lib = 1; \
1063 return (be_wewy_wewy_quiet ? NULL : find_lib); \
1064 } \
1065 } \
207 } \ 1066 } \
208 ++dyn; \ 1067 ++dyn; \
209 } \ 1068 } \
210 } } 1069 } }
211 SHOW_NEEDED(32) 1070 SHOW_NEEDED(32)
212 SHOW_NEEDED(64) 1071 SHOW_NEEDED(64)
1072 if (op == 0 && !*found_needed && be_verbose)
1073 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
213 } 1074 }
214 if (!be_quiet && !*found_needed) 1075
215 printf(" - "); 1076 return NULL;
216 else if (*found_needed)
217 printf(" ");
218} 1077}
219static void scanelf_file_interp(elfobj *elf, char *found_interp) 1078static char *scanelf_file_interp(elfobj *elf, char *found_interp)
220{ 1079{
221 void *strtbl_void; 1080 uint64_t offset = 0;
222 1081
223 if (!show_interp) return; 1082 if (!show_interp) return NULL;
224 1083
1084 if (elf->phdr) {
1085 /* Walk all the program headers to find the PT_INTERP */
1086#define SHOW_PT_INTERP(B) \
1087 if (elf->elf_class == ELFCLASS ## B) { \
1088 size_t i; \
1089 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1090 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1091 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
1092 if (EGET(phdr[i].p_type) == PT_INTERP) { \
1093 offset = EGET(phdr[i].p_offset); \
1094 break; \
1095 } \
1096 } \
1097 }
1098 SHOW_PT_INTERP(32)
1099 SHOW_PT_INTERP(64)
1100 } else if (elf->shdr) {
1101 /* Use the section headers to find it */
225 strtbl_void = elf_findsecbyname(elf, ".interp"); 1102 void *strtbl_void = elf_findsecbyname(elf, ".interp");
226 1103
227 if (strtbl_void) {
228#define SHOW_INTERP(B) \ 1104#define SHOW_INTERP(B) \
229 if (elf->elf_class == ELFCLASS ## B) { \ 1105 if (elf->elf_class == ELFCLASS ## B) { \
230 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 1106 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
231 printf("%s ", elf->data + EGET(strtbl->sh_offset)); \ 1107 offset = EGET(strtbl->sh_offset); \
232 *found_interp = 1; \
233 } 1108 }
1109 if (strtbl_void) {
234 SHOW_INTERP(32) 1110 SHOW_INTERP(32)
235 SHOW_INTERP(64) 1111 SHOW_INTERP(64)
236 } 1112 }
237 if (!be_quiet && !*found_interp) 1113 }
238 printf(" - "); 1114
239 else if (*found_interp) 1115 /* Validate the pointer even if we don't use it in output */
240 printf(" "); 1116 if (offset && offset <= (uint64_t)elf->len) {
1117 char *interp = elf->data + offset;
1118
1119 /* If it isn't a C pointer, it's garbage */
1120 if (memchr(interp, 0, elf->len - offset)) {
1121 *found_interp = 1;
1122 if (!be_wewy_wewy_quiet)
1123 return interp;
1124 }
1125 }
1126
1127 return NULL;
241} 1128}
1129static const char *scanelf_file_bind(elfobj *elf, char *found_bind)
1130{
1131 unsigned long i;
1132 struct stat s;
1133 bool dynamic = false;
1134
1135 if (!show_bind) return NULL;
1136 if (!elf->phdr) return NULL;
1137
1138#define SHOW_BIND(B) \
1139 if (elf->elf_class == ELFCLASS ## B) { \
1140 Elf ## B ## _Dyn *dyn; \
1141 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1142 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1143 Elf ## B ## _Off offset; \
1144 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1145 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1146 dynamic = true; \
1147 offset = EGET(phdr[i].p_offset); \
1148 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
1149 dyn = DYN ## B (elf->vdata + offset); \
1150 while (EGET(dyn->d_tag) != DT_NULL) { \
1151 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
1152 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
1153 { \
1154 if (be_quiet) return NULL; \
1155 *found_bind = 1; \
1156 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
1157 } \
1158 ++dyn; \
1159 } \
1160 } \
1161 }
1162 SHOW_BIND(32)
1163 SHOW_BIND(64)
1164
1165 if (be_wewy_wewy_quiet) return NULL;
1166
1167 /* don't output anything if quiet mode and the ELF is static or not setuid */
1168 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
1169 return NULL;
1170 } else {
1171 *found_bind = 1;
1172 return dynamic ? "LAZY" : "STATIC";
1173 }
1174}
242static void scanelf_file_sym(elfobj *elf, char *found_sym, const char *filename) 1175static char *scanelf_file_soname(elfobj *elf, char *found_soname)
243{ 1176{
244 int i; 1177 unsigned long i;
1178 char *soname;
1179 void *strtbl_void;
1180
1181 if (!show_soname) return NULL;
1182
1183 strtbl_void = elf_findsecbyname(elf, ".dynstr");
1184
1185 if (elf->phdr && strtbl_void) {
1186#define SHOW_SONAME(B) \
1187 if (elf->elf_class == ELFCLASS ## B) { \
1188 Elf ## B ## _Dyn *dyn; \
1189 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1190 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1191 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
1192 Elf ## B ## _Off offset; \
1193 /* only look for soname in shared objects */ \
1194 if (EGET(ehdr->e_type) != ET_DYN) \
1195 return NULL; \
1196 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1197 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1198 offset = EGET(phdr[i].p_offset); \
1199 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
1200 dyn = DYN ## B (elf->vdata + offset); \
1201 while (EGET(dyn->d_tag) != DT_NULL) { \
1202 if (EGET(dyn->d_tag) == DT_SONAME) { \
1203 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
1204 if (offset >= (Elf ## B ## _Off)elf->len) { \
1205 ++dyn; \
1206 continue; \
1207 } \
1208 soname = elf->data + offset; \
1209 *found_soname = 1; \
1210 return (be_wewy_wewy_quiet ? NULL : soname); \
1211 } \
1212 ++dyn; \
1213 } \
1214 } }
1215 SHOW_SONAME(32)
1216 SHOW_SONAME(64)
1217 }
1218
1219 return NULL;
1220}
1221
1222/*
1223 * We support the symbol form:
1224 * [%[modifiers]%][[+-]<symbol name>][,[.....]]
1225 * If the symbol name is empty, then all symbols are matched.
1226 * If the symbol name is a glob ("*"), then all symbols are dumped (debug).
1227 * Do not rely on this output format at all.
1228 * Otherwise the symbol name is used to search (either regex or string compare).
1229 * If the first char of the symbol name is a plus ("+"), then only match
1230 * defined symbols. If it's a minus ("-"), only match undefined symbols.
1231 * Putting modifiers in between the percent signs allows for more in depth
1232 * filters. There are groups of modifiers. If you don't specify a member
1233 * of a group, then all types in that group are matched. The current
1234 * groups and their types are:
1235 * STT group: STT_NOTYPE:n STT_OBJECT:o STT_FUNC:f STT_FILE:F
1236 * STB group: STB_LOCAL:l STB_GLOBAL:g STB_WEAK:w
1237 * STV group: STV_DEFAULT:p STV_INTERNAL:i STV_HIDDEN:h STV_PROTECTED:P
1238 * SHN group: SHN_UNDEF:u SHN_ABS:a SHN_COMMON:c {defined}:d
1239 * The "defined" value in the SHN group does not correspond to a SHN_xxx define.
1240 * You can search for multiple symbols at once by seperating with a comma (",").
1241 *
1242 * Some examples:
1243 * ELFs with a weak function "foo":
1244 * scanelf -s %wf%foo <ELFs>
1245 * ELFs that define the symbol "main":
1246 * scanelf -s +main <ELFs>
1247 * scanelf -s %d%main <ELFs>
1248 * ELFs that refer to the undefined symbol "brk":
1249 * scanelf -s -brk <ELFs>
1250 * scanelf -s %u%brk <ELFs>
1251 * All global defined objects in an ELF:
1252 * scanelf -s %ogd% <ELF>
1253 */
1254static void
1255scanelf_match_symname(elfobj *elf, char *found_sym, char **ret, size_t *ret_len, const char *symname,
1256 unsigned int stt, unsigned int stb, unsigned int stv, unsigned int shn, unsigned long size)
1257{
1258 const char *this_sym;
1259 size_t n;
1260
1261 array_for_each(find_sym_arr, n, this_sym) {
1262 bool inc_notype, inc_object, inc_func, inc_file,
1263 inc_local, inc_global, inc_weak,
1264 inc_visdef, inc_intern, inc_hidden, inc_prot,
1265 inc_def, inc_undef, inc_abs, inc_common;
1266
1267 /* symbol selection! */
1268 inc_notype = inc_object = inc_func = inc_file =
1269 inc_local = inc_global = inc_weak =
1270 inc_visdef = inc_intern = inc_hidden = inc_prot =
1271 inc_def = inc_undef = inc_abs = inc_common =
1272 (*this_sym != '%');
1273
1274 /* parse the contents of %...% */
1275 if (!inc_notype) {
1276 while (*(this_sym++)) {
1277 if (*this_sym == '%') {
1278 ++this_sym;
1279 break;
1280 }
1281 switch (*this_sym) {
1282 case 'n': inc_notype = true; break;
1283 case 'o': inc_object = true; break;
1284 case 'f': inc_func = true; break;
1285 case 'F': inc_file = true; break;
1286 case 'l': inc_local = true; break;
1287 case 'g': inc_global = true; break;
1288 case 'w': inc_weak = true; break;
1289 case 'p': inc_visdef = true; break;
1290 case 'i': inc_intern = true; break;
1291 case 'h': inc_hidden = true; break;
1292 case 'P': inc_prot = true; break;
1293 case 'd': inc_def = true; break;
1294 case 'u': inc_undef = true; break;
1295 case 'a': inc_abs = true; break;
1296 case 'c': inc_common = true; break;
1297 default: err("invalid symbol selector '%c'", *this_sym);
1298 }
1299 }
1300
1301 /* If no types are matched, not match all */
1302 if (!inc_notype && !inc_object && !inc_func && !inc_file)
1303 inc_notype = inc_object = inc_func = inc_file = true;
1304 if (!inc_local && !inc_global && !inc_weak)
1305 inc_local = inc_global = inc_weak = true;
1306 if (!inc_visdef && !inc_intern && !inc_hidden && !inc_prot)
1307 inc_visdef = inc_intern = inc_hidden = inc_prot = true;
1308 if (!inc_def && !inc_undef && !inc_abs && !inc_common)
1309 inc_def = inc_undef = inc_abs = inc_common = true;
1310
1311 /* backwards compat for defined/undefined short hand */
1312 } else if (*this_sym == '+') {
1313 inc_undef = false;
1314 ++this_sym;
1315 } else if (*this_sym == '-') {
1316 inc_def = inc_abs = inc_common = false;
1317 ++this_sym;
1318 }
1319
1320 /* filter symbols */
1321 if ((!inc_notype && stt == STT_NOTYPE ) || \
1322 (!inc_object && stt == STT_OBJECT ) || \
1323 (!inc_func && stt == STT_FUNC ) || \
1324 (!inc_file && stt == STT_FILE ) || \
1325 (!inc_local && stb == STB_LOCAL ) || \
1326 (!inc_global && stb == STB_GLOBAL ) || \
1327 (!inc_weak && stb == STB_WEAK ) || \
1328 (!inc_visdef && stv == STV_DEFAULT ) || \
1329 (!inc_intern && stv == STV_INTERNAL ) || \
1330 (!inc_hidden && stv == STV_HIDDEN ) || \
1331 (!inc_prot && stv == STV_PROTECTED) || \
1332 (!inc_def && shn && shn < SHN_LORESERVE) || \
1333 (!inc_undef && shn == SHN_UNDEF ) || \
1334 (!inc_abs && shn == SHN_ABS ) || \
1335 (!inc_common && shn == SHN_COMMON ))
1336 continue;
1337
1338 if (*this_sym == '*') {
1339 /* a "*" symbol gets you debug output */
1340 printf("%s(%s) %5lX %-15s %-15s %-15s %-15s %s\n",
1341 ((*found_sym == 0) ? "\n\t" : "\t"),
1342 elf->base_filename,
1343 size,
1344 get_elfstttype(stt),
1345 get_elfstbtype(stb),
1346 get_elfstvtype(stv),
1347 get_elfshntype(shn),
1348 symname);
1349 goto matched;
1350
1351 } else {
1352 if (g_match) {
1353 /* regex match the symbol */
1354 if (regexec(find_sym_regex_arr->eles[n], symname, 0, NULL, 0) == REG_NOMATCH)
1355 continue;
1356
1357 } else if (*this_sym) {
1358 /* give empty symbols a "pass", else do a normal compare */
1359 const size_t len = strlen(this_sym);
1360 if (!(strncmp(this_sym, symname, len) == 0 &&
1361 /* Accept unversioned symbol names */
1362 (symname[len] == '\0' || symname[len] == '@')))
1363 continue;
1364 }
1365
1366 if (be_semi_verbose) {
1367 char buf[1024];
1368 snprintf(buf, sizeof(buf), "%lX %s %s",
1369 size,
1370 get_elfstttype(stt),
1371 this_sym);
1372 *ret = xstrdup(buf);
1373 } else {
1374 if (*ret) xchrcat(ret, ',', ret_len);
1375 xstrcat(ret, symname, ret_len);
1376 }
1377
1378 goto matched;
1379 }
1380 }
1381
1382 return;
1383
1384 matched:
1385 *found_sym = 1;
1386}
1387
1388static const char *scanelf_file_sym(elfobj *elf, char *found_sym)
1389{
1390 char *ret;
245 void *symtab_void, *strtab_void; 1391 void *symtab_void, *strtab_void;
246 1392
247 if (!find_sym) return; 1393 if (!find_sym) return NULL;
1394 ret = NULL;
248 1395
249 symtab_void = elf_findsecbyname(elf, ".symtab"); 1396 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
250 strtab_void = elf_findsecbyname(elf, ".strtab");
251 1397
252 if (symtab_void && strtab_void) { 1398 if (symtab_void && strtab_void) {
253#define FIND_SYM(B) \ 1399#define FIND_SYM(B) \
254 if (elf->elf_class == ELFCLASS ## B) { \ 1400 if (elf->elf_class == ELFCLASS ## B) { \
255 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 1401 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
256 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 1402 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
257 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 1403 Elf ## B ## _Sym *sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
258 int cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 1404 Elf ## B ## _Word i, cnt = EGET(symtab->sh_entsize); \
259 char *symname; \ 1405 char *symname; \
1406 size_t ret_len = 0; \
1407 if (cnt) \
1408 cnt = EGET(symtab->sh_size) / cnt; \
260 for (i = 0; i < cnt; ++i) { \ 1409 for (i = 0; i < cnt; ++i) { \
1410 if ((void*)sym > elf->data_end) { \
1411 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1412 goto break_out; \
1413 } \
261 if (sym->st_name) { \ 1414 if (sym->st_name) { \
1415 /* make sure the symbol name is in acceptable memory range */ \
262 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 1416 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
263 if (*find_sym == '*') { \ 1417 if ((void*)symname > elf->data_end) { \
264 printf("%s(%s) %5lX %15s %s\n", \ 1418 warnf("%s: corrupt ELF symbols", elf->filename); \
265 ((*found_sym == 0) ? "\n\t" : "\t"), \ 1419 ++sym; \
266 (char *)basename(filename), \ 1420 continue; \
267 (long)sym->st_size, \ 1421 } \
268 (char *)get_elfstttype(sym->st_info), \ 1422 scanelf_match_symname(elf, found_sym, \
269 symname); \ 1423 &ret, &ret_len, symname, \
270 *found_sym = 1; \ 1424 ELF##B##_ST_TYPE(EGET(sym->st_info)), \
271 } else if ((strcmp(find_sym, symname) == 0) || \ 1425 ELF##B##_ST_BIND(EGET(sym->st_info)), \
272 (strcmp(symname, versioned_symname) == 0)) \ 1426 ELF##B##_ST_VISIBILITY(EGET(sym->st_other)), \
273 (*found_sym)++; \ 1427 EGET(sym->st_shndx), \
1428 /* st_size can be 64bit, but no one is really that big, so screw em */ \
1429 EGET(sym->st_size)); \
274 } \ 1430 } \
275 ++sym; \ 1431 ++sym; \
276 } } 1432 } \
1433 }
277 FIND_SYM(32) 1434 FIND_SYM(32)
278 FIND_SYM(64) 1435 FIND_SYM(64)
279 } 1436 }
280 if (*find_sym != '*') { 1437
281 if (*found_sym) 1438break_out:
282 printf(" %s ", find_sym); 1439 if (be_wewy_wewy_quiet) return NULL;
1440
1441 if (*find_sym != '*' && *found_sym)
1442 return ret;
283 else if (!be_quiet) 1443 if (be_quiet)
284 printf(" - "); 1444 return NULL;
285 } 1445 else
1446 return " - ";
286} 1447}
1448
1449static const char *scanelf_file_sections(elfobj *elf, char *found_section)
1450{
1451 if (!find_section)
1452 return NULL;
1453
1454#define FIND_SECTION(B) \
1455 if (elf->elf_class == ELFCLASS ## B) { \
1456 size_t matched, n; \
1457 int invert; \
1458 const char *section_name; \
1459 Elf ## B ## _Shdr *section; \
1460 \
1461 matched = 0; \
1462 array_for_each(find_section_arr, n, section_name) { \
1463 invert = (*section_name == '!' ? 1 : 0); \
1464 section = SHDR ## B (elf_findsecbyname(elf, section_name + invert)); \
1465 if ((section == NULL && invert) || (section != NULL && !invert)) \
1466 ++matched; \
1467 } \
1468 \
1469 if (matched == array_cnt(find_section_arr)) \
1470 *found_section = 1; \
1471 }
1472 FIND_SECTION(32)
1473 FIND_SECTION(64)
1474
1475 if (be_wewy_wewy_quiet)
1476 return NULL;
1477
1478 if (*found_section)
1479 return find_section;
1480
1481 if (be_quiet)
1482 return NULL;
1483 else
1484 return " - ";
1485}
1486
287/* scan an elf file and show all the fun stuff */ 1487/* scan an elf file and show all the fun stuff */
288static void scanelf_file(const char *filename) 1488#define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
1489static int scanelf_elfobj(elfobj *elf)
289{ 1490{
290 int i; 1491 unsigned long i;
291 char found_pax, found_stack, found_relro, found_textrel, 1492 char found_pax, found_phdr, found_relro, found_load, found_textrel,
292 found_rpath, found_needed, found_interp, found_sym, 1493 found_rpath, found_needed, found_interp, found_bind, found_soname,
293 found_file; 1494 found_sym, found_lib, found_file, found_textrels, found_section;
294 elfobj *elf; 1495 static char *out_buffer = NULL;
295 struct stat st; 1496 static size_t out_len;
296 1497
297 /* make sure 'filename' exists */
298 if (lstat(filename, &st) == -1) {
299 if (be_verbose > 2) printf("%s: does not exist\n", filename);
300 return;
301 }
302 /* always handle regular files and handle symlinked files if no -y */
303 if (!(S_ISREG(st.st_mode) || (S_ISLNK(st.st_mode) && scan_symlink))) {
304 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
305 return;
306 }
307
308 found_pax = found_stack = found_relro = found_textrel = \ 1498 found_pax = found_phdr = found_relro = found_load = found_textrel = \
309 found_rpath = found_needed = found_interp = found_sym = \ 1499 found_rpath = found_needed = found_interp = found_bind = found_soname = \
310 found_file = 0; 1500 found_sym = found_lib = found_file = found_textrels = found_section = 0;
311 1501
312 /* verify this is real ELF */
313 if ((elf = readelf(filename)) == NULL) {
314 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
315 return;
316 }
317
318 if (be_verbose > 1) 1502 if (be_verbose > 2)
319 printf("%s: {%s,%s} scanning file\n", filename, 1503 printf("%s: scanning file {%s,%s}\n", elf->filename,
320 get_elfeitype(elf, EI_CLASS, elf->elf_class), 1504 get_elfeitype(EI_CLASS, elf->elf_class),
321 get_elfeitype(elf, EI_DATA, elf->data[EI_DATA])); 1505 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
322 else if (be_verbose) 1506 else if (be_verbose > 1)
323 printf("%s: scanning file\n", filename); 1507 printf("%s: scanning file\n", elf->filename);
1508
1509 /* init output buffer */
1510 if (!out_buffer) {
1511 out_len = sizeof(char) * 80;
1512 out_buffer = xmalloc(out_len);
1513 }
1514 *out_buffer = '\0';
324 1515
325 /* show the header */ 1516 /* show the header */
326 if (!be_quiet && show_banner) { 1517 if (!be_quiet && show_banner) {
327 if (out_format) {
328 for (i=0; out_format[i]; ++i) {
329 if (out_format[i] != '%') continue;
330
331 switch (out_format[++i]) {
332 case '%': break;
333 case 'F': printf("FILE "); break;
334 case 'x': printf(" PAX "); break;
335 case 'e': printf("STK/REL "); break;
336 case 't': printf("TEXTREL "); break;
337 case 'r': printf("RPATH "); break;
338 case 'n': printf("NEEDED "); break;
339 case 'i': printf("INTERP "); break;
340 case 's': printf("SYM "); break;
341 }
342 }
343 } else {
344 printf(" TYPE ");
345 if (show_pax) printf(" PAX ");
346 if (show_stack) printf("STK/REL ");
347 if (show_textrel) printf("TEXTREL ");
348 if (show_rpath) printf("RPATH ");
349 if (show_needed) printf("NEEDED ");
350 if (show_interp) printf("INTERP ");
351 if (find_sym) printf("SYM ");
352 }
353 if (!found_file) printf(" FILE");
354 printf("\n");
355 show_banner = 0;
356 }
357
358 /* dump all the good stuff */
359 if (!be_quiet && !out_format)
360 printf("%-7s ", get_elfetype(elf));
361
362 if (out_format) {
363 for (i=0; out_format[i]; ++i) { 1518 for (i = 0; out_format[i]; ++i) {
364 if (out_format[i] != '%') { 1519 if (!IS_MODIFIER(out_format[i])) continue;
365 printf("%c", out_format[i]);
366 continue;
367 }
368 1520
369 switch (out_format[++i]) { 1521 switch (out_format[++i]) {
1522 case '+': break;
1523 case '%': break;
1524 case '#': break;
1525 case 'F':
1526 case 'p':
1527 case 'f': prints("FILE "); found_file = 1; break;
1528 case 'o': prints(" TYPE "); break;
1529 case 'x': prints(" PAX "); break;
1530 case 'e': prints("STK/REL/PTL "); break;
1531 case 't': prints("TEXTREL "); break;
1532 case 'r': prints("RPATH "); break;
1533 case 'M': prints("CLASS "); break;
1534 case 'l':
1535 case 'n': prints("NEEDED "); break;
1536 case 'i': prints("INTERP "); break;
1537 case 'b': prints("BIND "); break;
1538 case 'Z': prints("SIZE "); break;
1539 case 'S': prints("SONAME "); break;
370 case '%': printf("%%"); break; 1540 case 's': prints("SYM "); break;
371 case 'F': found_file = 1; printf("%s ", filename); break; 1541 case 'N': prints("LIB "); break;
372 case 'x': scanelf_file_pax(elf, &found_pax); break; 1542 case 'T': prints("TEXTRELS "); break;
373 case 'e': scanelf_file_stack(elf, &found_stack, &found_relro); break; 1543 case 'k': prints("SECTION "); break;
374 case 't': scanelf_file_textrel(elf, &found_textrel); break; 1544 case 'a': prints("ARCH "); break;
375 case 'r': scanelf_file_rpath(elf, &found_rpath); break; 1545 case 'I': prints("OSABI "); break;
376 case 'n': scanelf_file_needed(elf, &found_needed); break; 1546 case 'Y': prints("EABI "); break;
377 case 'i': scanelf_file_interp(elf, &found_interp); break; 1547 case 'O': prints("PERM "); break;
378 case 's': scanelf_file_sym(elf, &found_sym, filename); break; 1548 case 'D': prints("ENDIAN "); break;
1549 default: warnf("'%c' has no title ?", out_format[i]);
379 } 1550 }
380 } 1551 }
381 } else { 1552 if (!found_file) prints("FILE ");
382 scanelf_file_pax(elf, &found_pax);
383 scanelf_file_stack(elf, &found_stack, &found_relro);
384 scanelf_file_textrel(elf, &found_textrel);
385 scanelf_file_rpath(elf, &found_rpath);
386 scanelf_file_needed(elf, &found_needed);
387 scanelf_file_interp(elf, &found_interp);
388 scanelf_file_sym(elf, &found_sym, filename);
389 }
390
391 if (!found_file) {
392 if (!be_quiet || found_pax || found_stack || found_textrel || \
393 found_rpath || found_needed || found_sym)
394 puts(filename);
395 } else {
396 printf("\n"); 1553 prints("\n");
1554 found_file = 0;
1555 show_banner = 0;
1556 }
1557
1558 /* dump all the good stuff */
1559 for (i = 0; out_format[i]; ++i) {
1560 const char *out;
1561 const char *tmp;
1562 static char ubuf[sizeof(unsigned long)*2];
1563 if (!IS_MODIFIER(out_format[i])) {
1564 xchrcat(&out_buffer, out_format[i], &out_len);
1565 continue;
397 } 1566 }
398 1567
1568 out = NULL;
1569 be_wewy_wewy_quiet = (out_format[i] == '#');
1570 be_semi_verbose = (out_format[i] == '+');
1571 switch (out_format[++i]) {
1572 case '+':
1573 case '%':
1574 case '#':
1575 xchrcat(&out_buffer, out_format[i], &out_len); break;
1576 case 'F':
1577 found_file = 1;
1578 if (be_wewy_wewy_quiet) break;
1579 xstrcat(&out_buffer, elf->filename, &out_len);
1580 break;
1581 case 'p':
1582 found_file = 1;
1583 if (be_wewy_wewy_quiet) break;
1584 tmp = elf->filename;
1585 if (search_path) {
1586 ssize_t len_search = strlen(search_path);
1587 ssize_t len_file = strlen(elf->filename);
1588 if (!strncmp(elf->filename, search_path, len_search) && \
1589 len_file > len_search)
1590 tmp += len_search;
1591 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1592 }
1593 xstrcat(&out_buffer, tmp, &out_len);
1594 break;
1595 case 'f':
1596 found_file = 1;
1597 if (be_wewy_wewy_quiet) break;
1598 tmp = strrchr(elf->filename, '/');
1599 tmp = (tmp == NULL ? elf->filename : tmp+1);
1600 xstrcat(&out_buffer, tmp, &out_len);
1601 break;
1602 case 'o': out = get_elfetype(elf); break;
1603 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
1604 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
1605 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1606 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
1607 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1608 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1609 case 'D': out = get_endian(elf); break;
1610 case 'O': out = strfileperms(elf->filename); break;
1611 case 'n':
1612 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
1613 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1614 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1615 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
1616 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1617 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1618 case 'a': out = get_elfemtype(elf); break;
1619 case 'I': out = get_elfosabi(elf); break;
1620 case 'Y': out = get_elf_eabi(elf); break;
1621 case 'Z': snprintf(ubuf, sizeof(ubuf), "%lu", (unsigned long)elf->len); out = ubuf; break;;
1622 default: warnf("'%c' has no scan code?", out_format[i]);
1623 }
1624 if (out)
1625 xstrcat(&out_buffer, out, &out_len);
1626 }
1627
1628#define FOUND_SOMETHING() \
1629 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1630 found_rpath || found_needed || found_interp || found_bind || \
1631 found_soname || found_sym || found_lib || found_textrels || found_section )
1632
1633 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1634 xchrcat(&out_buffer, ' ', &out_len);
1635 xstrcat(&out_buffer, elf->filename, &out_len);
1636 }
1637 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
1638 puts(out_buffer);
1639 fflush(stdout);
1640 }
1641
1642 return 0;
1643}
1644
1645/* scan a single elf */
1646static int scanelf_elf(const char *filename, int fd, size_t len)
1647{
1648 int ret = 1;
1649 size_t n;
1650 const char *match_etype;
1651 elfobj *elf;
1652
1653 /* Verify this is a real ELF */
1654 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1655 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1656 return 2;
1657 }
1658
1659 /* Possibly filter based on ELF bitness */
1660 switch (match_bits) {
1661 case 32:
1662 if (elf->elf_class != ELFCLASS32)
1663 goto done;
1664 break;
1665 case 64:
1666 if (elf->elf_class != ELFCLASS64)
1667 goto done;
1668 break;
1669 }
1670
1671 /* Possibly filter based on the ELF's e_type field */
1672 array_for_each(match_etypes, n, match_etype)
1673 if (etype_lookup(match_etype) == get_etype(elf))
1674 goto scanit;
1675 if (array_cnt(match_etypes))
1676 goto done;
1677
1678 scanit:
1679 ret = scanelf_elfobj(elf);
1680
1681 done:
399 unreadelf(elf); 1682 unreadelf(elf);
1683 return ret;
1684}
1685
1686/* scan an archive of elfs */
1687static int scanelf_archive(const char *filename, int fd, size_t len)
1688{
1689 archive_handle *ar;
1690 archive_member *m;
1691 char *ar_buffer;
1692 elfobj *elf;
1693
1694 ar = ar_open_fd(filename, fd);
1695 if (ar == NULL)
1696 return 1;
1697
1698 ar_buffer = mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1699 while ((m = ar_next(ar)) != NULL) {
1700 off_t cur_pos = lseek(fd, 0, SEEK_CUR);
1701 if (cur_pos == -1)
1702 errp("lseek() failed");
1703 elf = readelf_buffer(m->name, ar_buffer + cur_pos, m->size);
1704 if (elf) {
1705 scanelf_elfobj(elf);
1706 unreadelf(elf);
1707 }
1708 }
1709 munmap(ar_buffer, len);
1710
1711 return 0;
1712}
1713/* scan a file which may be an elf or an archive or some other magical beast */
1714static int scanelf_fileat(int dir_fd, const char *filename, const struct stat *st_cache)
1715{
1716 const struct stat *st = st_cache;
1717 struct stat symlink_st;
1718 int fd;
1719
1720 /* always handle regular files and handle symlinked files if no -y */
1721 if (S_ISLNK(st->st_mode)) {
1722 if (!scan_symlink)
1723 return 1;
1724 fstatat(dir_fd, filename, &symlink_st, 0);
1725 st = &symlink_st;
1726 }
1727
1728 if (!S_ISREG(st->st_mode)) {
1729 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1730 return 1;
1731 }
1732
1733 if (match_perms) {
1734 if ((st->st_mode | match_perms) != st->st_mode)
1735 return 1;
1736 }
1737 fd = openat(dir_fd, filename, (fix_elf ? O_RDWR : O_RDONLY) | O_CLOEXEC);
1738 if (fd == -1) {
1739 if (fix_elf && errno == ETXTBSY)
1740 warnp("%s: could not fix", filename);
1741 else if (be_verbose > 2)
1742 printf("%s: skipping file: %s\n", filename, strerror(errno));
1743 return 1;
1744 }
1745
1746 if (scanelf_elf(filename, fd, st->st_size) == 2) {
1747 /* if it isn't an ELF, maybe it's an .a archive */
1748 if (scan_archives)
1749 scanelf_archive(filename, fd, st->st_size);
1750
1751 /*
1752 * unreadelf() implicitly closes its fd, so only close it
1753 * when we are returning it in the non-ELF case
1754 */
1755 close(fd);
1756 }
1757
1758 return 0;
400} 1759}
401 1760
402/* scan a directory for ET_EXEC files and print when we find one */ 1761/* scan a directory for ET_EXEC files and print when we find one */
403static void scanelf_dir(const char *path) 1762static int scanelf_dirat(int dir_fd, const char *path)
404{ 1763{
405 register DIR *dir; 1764 register DIR *dir;
406 register struct dirent *dentry; 1765 register struct dirent *dentry;
407 struct stat st_top, st; 1766 struct stat st_top, st;
408 char buf[_POSIX_PATH_MAX]; 1767 char buf[__PAX_UTILS_PATH_MAX], *subpath;
409 size_t pathlen = 0, len = 0; 1768 size_t pathlen = 0, len = 0;
1769 int ret = 0;
1770 int subdir_fd;
410 1771
411 /* make sure path exists */ 1772 /* make sure path exists */
412 if (lstat(path, &st_top) == -1) { 1773 if (fstatat(dir_fd, path, &st_top, AT_SYMLINK_NOFOLLOW) == -1) {
413 if (be_verbose > 2) printf("%s: does not exist\n", path); 1774 if (be_verbose > 2) printf("%s: does not exist\n", path);
414 return; 1775 return 1;
415 } 1776 }
416 1777
417 /* ok, if it isn't a directory, assume we can open it */ 1778 /* ok, if it isn't a directory, assume we can open it */
418 if (!S_ISDIR(st_top.st_mode)) { 1779 if (!S_ISDIR(st_top.st_mode))
419 scanelf_file(path); 1780 return scanelf_fileat(dir_fd, path, &st_top);
420 return;
421 }
422 1781
423 /* now scan the dir looking for fun stuff */ 1782 /* now scan the dir looking for fun stuff */
424 if ((dir = opendir(path)) == NULL) { 1783 subdir_fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
425 warnf("could not opendir %s: %s", path, strerror(errno)); 1784 if (subdir_fd == -1)
1785 dir = NULL;
1786 else
1787 dir = fdopendir(subdir_fd);
1788 if (dir == NULL) {
1789 if (subdir_fd != -1)
1790 close(subdir_fd);
1791 else if (be_verbose > 2)
1792 printf("%s: skipping dir: %s\n", path, strerror(errno));
426 return; 1793 return 1;
427 } 1794 }
428 if (be_verbose) printf("%s: scanning dir\n", path); 1795 if (be_verbose > 1) printf("%s: scanning dir\n", path);
429 1796
430 pathlen = strlen(path); 1797 subpath = stpcpy(buf, path);
1798 if (subpath[-1] != '/')
1799 *subpath++ = '/';
1800 pathlen = subpath - buf;
431 while ((dentry = readdir(dir))) { 1801 while ((dentry = readdir(dir))) {
432 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1802 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
433 continue; 1803 continue;
1804
1805 if (fstatat(subdir_fd, dentry->d_name, &st, AT_SYMLINK_NOFOLLOW) == -1)
1806 continue;
1807
434 len = (pathlen + 1 + strlen(dentry->d_name) + 1); 1808 len = strlen(dentry->d_name);
435 if (len >= sizeof(buf)) { 1809 if (len + pathlen + 1 >= sizeof(buf)) {
436 warnf("Skipping '%s': len > sizeof(buf); %d > %d\n", path, (int)len, (int)sizeof(buf)); 1810 warnf("Skipping '%s%s': len > sizeof(buf); %zu > %zu\n",
1811 path, dentry->d_name, len + pathlen + 1, sizeof(buf));
437 continue; 1812 continue;
438 } 1813 }
439 sprintf(buf, "%s/%s", path, dentry->d_name); 1814 memcpy(subpath, dentry->d_name, len);
440 if (lstat(buf, &st) != -1) { 1815 subpath[len] = '\0';
1816
441 if (S_ISREG(st.st_mode)) 1817 if (S_ISREG(st.st_mode))
442 scanelf_file(buf); 1818 ret = scanelf_fileat(dir_fd, buf, &st);
443 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1819 else if (dir_recurse && S_ISDIR(st.st_mode)) {
444 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1820 if (dir_crossmount || (st_top.st_dev == st.st_dev))
445 scanelf_dir(buf); 1821 ret = scanelf_dirat(dir_fd, buf);
1822 }
1823 }
1824 closedir(dir);
1825
1826 return ret;
1827}
1828static int scanelf_dir(const char *path)
1829{
1830 return scanelf_dirat(root_fd, root_rel_path(path));
1831}
1832
1833static int scanelf_from_file(const char *filename)
1834{
1835 FILE *fp;
1836 char *p, *path;
1837 size_t len;
1838 int ret;
1839
1840 if (strcmp(filename, "-") == 0)
1841 fp = stdin;
1842 else if ((fp = fopen(filename, "r")) == NULL)
1843 return 1;
1844
1845 path = NULL;
1846 len = 0;
1847 ret = 0;
1848 while (getline(&path, &len, fp) != -1) {
1849 if ((p = strchr(path, '\n')) != NULL)
1850 *p = 0;
1851 search_path = path;
1852 ret = scanelf_dir(path);
1853 }
1854 free(path);
1855
1856 if (fp != stdin)
1857 fclose(fp);
1858
1859 return ret;
1860}
1861
1862#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1863
1864static int _load_ld_cache_config(const char *fname)
1865{
1866 FILE *fp = NULL;
1867 char *p, *path;
1868 size_t len;
1869 int curr_fd = -1;
1870
1871 fp = fopenat_r(root_fd, root_rel_path(fname));
1872 if (fp == NULL)
1873 return -1;
1874
1875 path = NULL;
1876 len = 0;
1877 while (getline(&path, &len, fp) != -1) {
1878 if ((p = strrchr(path, '\r')) != NULL)
1879 *p = 0;
1880 if ((p = strchr(path, '\n')) != NULL)
1881 *p = 0;
1882
1883 /* recursive includes of the same file will make this segfault. */
1884 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1885 glob_t gl;
1886 size_t x;
1887 const char *gpath;
1888
1889 /* re-use existing path buffer ... need to be creative */
1890 if (path[8] != '/')
1891 gpath = memcpy(path + 3, "/etc/", 5);
1892 else
1893 gpath = path + 8;
1894 if (root_fd != AT_FDCWD) {
1895 if (curr_fd == -1) {
1896 curr_fd = open(".", O_RDONLY|O_CLOEXEC);
1897 if (fchdir(root_fd))
1898 errp("unable to change to root dir");
1899 }
1900 gpath = root_rel_path(gpath);
446 } 1901 }
1902
1903 if (glob(gpath, 0, NULL, &gl) == 0) {
1904 for (x = 0; x < gl.gl_pathc; ++x) {
1905 /* try to avoid direct loops */
1906 if (strcmp(gl.gl_pathv[x], fname) == 0)
1907 continue;
1908 _load_ld_cache_config(gl.gl_pathv[x]);
1909 }
1910 globfree(&gl);
1911 }
1912
1913 /* failed globs are ignored by glibc */
1914 continue;
447 } 1915 }
1916
1917 if (*path != '/')
1918 continue;
1919
1920 xarraypush_str(ldpaths, path);
448 } 1921 }
449 closedir(dir); 1922 free(path);
1923
1924 fclose(fp);
1925
1926 if (curr_fd != -1) {
1927 if (fchdir(curr_fd))
1928 {/* don't care */}
1929 close(curr_fd);
1930 }
1931
1932 return 0;
1933}
1934
1935#elif defined(__FreeBSD__) || defined(__DragonFly__)
1936
1937static int _load_ld_cache_config(const char *fname)
1938{
1939 FILE *fp = NULL;
1940 char *b = NULL, *p;
1941 struct elfhints_hdr hdr;
1942
1943 fp = fopenat_r(root_fd, root_rel_path(fname));
1944 if (fp == NULL)
1945 return -1;
1946
1947 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1948 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1949 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1950 {
1951 fclose(fp);
1952 return -1;
1953 }
1954
1955 b = xmalloc(hdr.dirlistlen + 1);
1956 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1957 fclose(fp);
1958 free(b);
1959 return -1;
1960 }
1961
1962 while ((p = strsep(&b, ":"))) {
1963 if (*p == '\0')
1964 continue;
1965 xarraypush_str(ldpaths, p);
1966 }
1967
1968 free(b);
1969 fclose(fp);
1970 return 0;
1971}
1972
1973#else
1974#ifdef __ELF__
1975#warning Cache config support not implemented for your target
1976#endif
1977static int _load_ld_cache_config(const char *fname)
1978{
1979 return 0;
1980}
1981#endif
1982
1983static void load_ld_cache_config(const char *fname)
1984{
1985 bool scan_l, scan_ul, scan_ull;
1986 size_t n;
1987 const char *ldpath;
1988
1989 _load_ld_cache_config(fname);
1990
1991 scan_l = scan_ul = scan_ull = false;
1992 array_for_each(ldpaths, n, ldpath) {
1993 if (!scan_l && !strcmp(ldpath, "/lib")) scan_l = true;
1994 if (!scan_ul && !strcmp(ldpath, "/usr/lib")) scan_ul = true;
1995 if (!scan_ull && !strcmp(ldpath, "/usr/local/lib")) scan_ull = true;
1996 }
1997
1998 if (!scan_l) xarraypush_str(ldpaths, "/lib");
1999 if (!scan_ul) xarraypush_str(ldpaths, "/usr/lib");
2000 if (!scan_ull) xarraypush_str(ldpaths, "/usr/local/lib");
450} 2001}
451 2002
452/* scan /etc/ld.so.conf for paths */ 2003/* scan /etc/ld.so.conf for paths */
453static void scanelf_ldpath() 2004static void scanelf_ldpath(void)
454{ 2005{
455 char scan_l, scan_ul, scan_ull; 2006 size_t n;
456 char *path, *p; 2007 const char *ldpath;
457 FILE *fp;
458 2008
459 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 2009 array_for_each(ldpaths, n, ldpath)
460 err("Unable to open ld.so.conf: %s", strerror(errno));
461
462 scan_l = scan_ul = scan_ull = 0;
463
464 if ((path = malloc(_POSIX_PATH_MAX)) == NULL) {
465 warn("Can not malloc() memory for ldpath scanning");
466 return;
467 }
468 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL)
469 if (*path == '/') {
470 if ((p = strrchr(path, '\r')) != NULL)
471 *p = 0;
472 if ((p = strrchr(path, '\n')) != NULL)
473 *p = 0;
474 if (!scan_l && !strcmp(path, "/lib")) scan_l = 1;
475 if (!scan_ul && !strcmp(path, "/usr/lib")) scan_ul = 1;
476 if (!scan_ull && !strcmp(path, "/usr/local/lib")) scan_ull = 1;
477 scanelf_dir(path); 2010 scanelf_dir(ldpath);
478 }
479 free(path);
480 fclose(fp);
481
482 if (!scan_l) scanelf_dir("/lib");
483 if (!scan_ul) scanelf_dir("/usr/lib");
484 if (!scan_ull) scanelf_dir("/usr/local/lib");
485} 2011}
486 2012
487/* scan env PATH for paths */ 2013/* scan env PATH for paths */
488static void scanelf_envpath() 2014static void scanelf_envpath(void)
489{ 2015{
490 char *path, *p; 2016 char *path, *p;
491 2017
492 path = getenv("PATH"); 2018 path = getenv("PATH");
493 if (!path) 2019 if (!path)
494 err("PATH is not set in your env !"); 2020 err("PATH is not set in your env !");
495 2021 path = xstrdup(path);
496 if ((path = strdup(path)) == NULL)
497 err("strdup failed: %s", strerror(errno));
498 2022
499 while ((p = strrchr(path, ':')) != NULL) { 2023 while ((p = strrchr(path, ':')) != NULL) {
500 scanelf_dir(p + 1); 2024 scanelf_dir(p + 1);
501 *p = 0; 2025 *p = 0;
502 } 2026 }
503 2027
504 free(path); 2028 free(path);
505} 2029}
506 2030
507 2031/* usage / invocation handling functions */ /* Free Flags: c d j u w G H J K P Q U W */
508
509/* usage / invocation handling functions */
510#define PARSE_FLAGS "plRmyxetrnis:aqvF:o:BhV" 2032#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZCBhV"
511#define a_argument required_argument 2033#define a_argument required_argument
512static struct option const long_opts[] = { 2034static struct option const long_opts[] = {
513 {"path", no_argument, NULL, 'p'}, 2035 {"path", no_argument, NULL, 'p'},
514 {"ldpath", no_argument, NULL, 'l'}, 2036 {"ldpath", no_argument, NULL, 'l'},
2037 {"use-ldpath",no_argument, NULL, 129},
2038 {"root", a_argument, NULL, 128},
515 {"recursive", no_argument, NULL, 'R'}, 2039 {"recursive", no_argument, NULL, 'R'},
516 {"mount", no_argument, NULL, 'm'}, 2040 {"mount", no_argument, NULL, 'm'},
517 {"symlink", no_argument, NULL, 'y'}, 2041 {"symlink", no_argument, NULL, 'y'},
2042 {"archives", no_argument, NULL, 'A'},
2043 {"ldcache", no_argument, NULL, 'L'},
2044 {"fix", no_argument, NULL, 'X'},
2045 {"setpax", a_argument, NULL, 'z'},
518 {"pax", no_argument, NULL, 'x'}, 2046 {"pax", no_argument, NULL, 'x'},
519 {"header", no_argument, NULL, 'e'}, 2047 {"header", no_argument, NULL, 'e'},
520 {"textrel", no_argument, NULL, 't'}, 2048 {"textrel", no_argument, NULL, 't'},
521 {"rpath", no_argument, NULL, 'r'}, 2049 {"rpath", no_argument, NULL, 'r'},
522 {"needed", no_argument, NULL, 'n'}, 2050 {"needed", no_argument, NULL, 'n'},
523 {"interp", no_argument, NULL, 'i'}, 2051 {"interp", no_argument, NULL, 'i'},
2052 {"bind", no_argument, NULL, 'b'},
2053 {"soname", no_argument, NULL, 'S'},
524 {"symbol", a_argument, NULL, 's'}, 2054 {"symbol", a_argument, NULL, 's'},
2055 {"section", a_argument, NULL, 'k'},
2056 {"lib", a_argument, NULL, 'N'},
2057 {"gmatch", no_argument, NULL, 'g'},
2058 {"textrels", no_argument, NULL, 'T'},
2059 {"etype", a_argument, NULL, 'E'},
2060 {"bits", a_argument, NULL, 'M'},
2061 {"endian", no_argument, NULL, 'D'},
2062 {"osabi", no_argument, NULL, 'I'},
2063 {"eabi", no_argument, NULL, 'Y'},
2064 {"perms", a_argument, NULL, 'O'},
2065 {"size", no_argument, NULL, 'Z'},
525 {"all", no_argument, NULL, 'a'}, 2066 {"all", no_argument, NULL, 'a'},
526 {"quiet", no_argument, NULL, 'q'}, 2067 {"quiet", no_argument, NULL, 'q'},
527 {"verbose", no_argument, NULL, 'v'}, 2068 {"verbose", no_argument, NULL, 'v'},
528 {"format", a_argument, NULL, 'F'}, 2069 {"format", a_argument, NULL, 'F'},
2070 {"from", a_argument, NULL, 'f'},
529 {"file", a_argument, NULL, 'o'}, 2071 {"file", a_argument, NULL, 'o'},
2072 {"nocolor", no_argument, NULL, 'C'},
530 {"nobanner", no_argument, NULL, 'B'}, 2073 {"nobanner", no_argument, NULL, 'B'},
531 {"help", no_argument, NULL, 'h'}, 2074 {"help", no_argument, NULL, 'h'},
532 {"version", no_argument, NULL, 'V'}, 2075 {"version", no_argument, NULL, 'V'},
533 {NULL, no_argument, NULL, 0x0} 2076 {NULL, no_argument, NULL, 0x0}
534}; 2077};
2078
535static char *opts_help[] = { 2079static const char * const opts_help[] = {
536 "Scan all directories in PATH environment", 2080 "Scan all directories in PATH environment",
537 "Scan all directories in /etc/ld.so.conf", 2081 "Scan all directories in /etc/ld.so.conf",
2082 "Use ld.so.conf to show full path (use with -r/-n)",
2083 "Root directory (use with -l or -p)",
538 "Scan directories recursively", 2084 "Scan directories recursively",
539 "Don't recursively cross mount points", 2085 "Don't recursively cross mount points",
540 "Don't scan symlinks\n", 2086 "Don't scan symlinks",
2087 "Scan archives (.a files)",
2088 "Utilize ld.so.cache to show full path (use with -r/-n)",
2089 "Try and 'fix' bad things (use with -r/-e)",
2090 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
541 "Print PaX markings", 2091 "Print PaX markings",
542 "Print GNU_STACK markings", 2092 "Print GNU_STACK/PT_LOAD markings",
543 "Print TEXTREL information", 2093 "Print TEXTREL information",
544 "Print RPATH information", 2094 "Print RPATH information",
545 "Print NEEDED information", 2095 "Print NEEDED information",
546 "Print INTERP information", 2096 "Print INTERP information",
2097 "Print BIND information",
2098 "Print SONAME information",
547 "Find a specified symbol", 2099 "Find a specified symbol",
548 "Print all scanned info (-x -e -t -r)\n", 2100 "Find a specified section",
2101 "Find a specified library",
2102 "Use regex rather than string compare (with -s); specify twice for case insensitive",
2103 "Locate cause of TEXTREL",
2104 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
2105 "Print only ELF files matching numeric bits",
2106 "Print Endianness",
2107 "Print OSABI",
2108 "Print EABI (EM_ARM Only)",
2109 "Print only ELF files matching octal permissions",
2110 "Print ELF file size",
2111 "Print all useful/simple info\n",
549 "Only output 'bad' things", 2112 "Only output 'bad' things",
550 "Be verbose (can be specified more than once)", 2113 "Be verbose (can be specified more than once)",
551 "Use specified format for output", 2114 "Use specified format for output",
2115 "Read input stream from a filename",
552 "Write output stream to a filename", 2116 "Write output stream to a filename",
2117 "Don't emit color in output",
553 "Don't display the header", 2118 "Don't display the header",
554 "Print this help and exit", 2119 "Print this help and exit",
555 "Print version and exit", 2120 "Print version and exit",
556 NULL 2121 NULL
557}; 2122};
558 2123
559/* display usage and exit */ 2124/* display usage and exit */
560static void usage(int status) 2125static void usage(int status)
561{ 2126{
2127 const char a_arg[] = "<arg>";
2128 size_t a_arg_len = strlen(a_arg) + 2;
2129 size_t i;
2130 int optlen;
2131 printf("* Scan ELF binaries for stuff\n\n"
2132 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
2133 printf("Options: -[%s]\n", PARSE_FLAGS);
2134
2135 /* prescan the --long opt length to auto-align */
2136 optlen = 0;
2137 for (i = 0; long_opts[i].name; ++i) {
2138 int l = strlen(long_opts[i].name);
2139 if (long_opts[i].has_arg == a_argument)
2140 l += a_arg_len;
2141 optlen = max(l, optlen);
2142 }
2143
2144 for (i = 0; long_opts[i].name; ++i) {
2145 /* first output the short flag if it has one */
2146 if (long_opts[i].val > '~')
2147 printf(" ");
2148 else
2149 printf(" -%c, ", long_opts[i].val);
2150
2151 /* then the long flag */
2152 if (long_opts[i].has_arg == no_argument)
2153 printf("--%-*s", optlen, long_opts[i].name);
2154 else
2155 printf("--%s %s %*s", long_opts[i].name, a_arg,
2156 (int)(optlen - strlen(long_opts[i].name) - a_arg_len), "");
2157
2158 /* finally the help text */
2159 printf("* %s\n", opts_help[i]);
2160 }
2161
2162 puts("\nFor more information, see the scanelf(1) manpage");
2163 exit(status);
2164}
2165
2166/* parse command line arguments and preform needed actions */
2167#define do_pax_state(option, flag) \
2168 if (islower(option)) { \
2169 flags &= ~PF_##flag; \
2170 flags |= PF_NO##flag; \
2171 } else { \
2172 flags &= ~PF_NO##flag; \
2173 flags |= PF_##flag; \
2174 }
2175static void parse_delimited(array_t *arr, char *arg, const char *delim)
2176{
2177 char *ele = strtok(arg, delim);
2178 if (!ele) /* edge case: -s '' */
2179 xarraypush_str(arr, "");
2180 while (ele) {
2181 xarraypush_str(arr, ele);
2182 ele = strtok(NULL, delim);
2183 }
2184}
2185static int parseargs(int argc, char *argv[])
2186{
562 int i; 2187 int i;
563 printf(" Scan ELF binaries for stuff\n\n" 2188 const char *from_file = NULL;
564 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0); 2189 int ret = 0;
565 printf("Options: -[%s]\n", PARSE_FLAGS); 2190 char load_cache_config = 0;
566 for (i = 0; long_opts[i].name; ++i)
567 if (long_opts[i].has_arg == no_argument)
568 printf(" -%c, --%-13s %s\n", long_opts[i].val,
569 long_opts[i].name, opts_help[i]);
570 else
571 printf(" -%c, --%-6s <arg> %s\n", long_opts[i].val,
572 long_opts[i].name, opts_help[i]);
573 exit(status);
574}
575
576/* parse command line arguments and preform needed actions */
577static void parseargs(int argc, char *argv[])
578{
579 int flag;
580 2191
581 opterr = 0; 2192 opterr = 0;
582 while ((flag=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 2193 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
583 switch (flag) { 2194 switch (i) {
584 2195
585 case 'V': 2196 case 'V':
586 printf("%s compiled %s\n%s\n" 2197 printf("pax-utils-%s: %s\n%s\n"
587 "%s written for Gentoo Linux by <solar and vapier @ gentoo.org>\n", 2198 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
588 __FILE__, __DATE__, rcsid, argv0); 2199 VERSION, __FILE__, rcsid, argv0);
589 exit(EXIT_SUCCESS); 2200 exit(EXIT_SUCCESS);
590 break; 2201 break;
591 case 'h': usage(EXIT_SUCCESS); break; 2202 case 'h': usage(EXIT_SUCCESS); break;
592 2203 case 'f':
2204 if (from_file) warn("You prob don't want to specify -f twice");
2205 from_file = optarg;
2206 break;
2207 case 'E':
2208 /* historically, this was comma delimited */
2209 parse_delimited(match_etypes, optarg, ",");
2210 break;
2211 case 'M':
2212 match_bits = atoi(optarg);
2213 if (match_bits == 0) {
2214 if (strcmp(optarg, "ELFCLASS32") == 0)
2215 match_bits = 32;
2216 if (strcmp(optarg, "ELFCLASS64") == 0)
2217 match_bits = 64;
2218 }
2219 break;
2220 case 'O':
2221 if (sscanf(optarg, "%o", &match_perms) == -1)
2222 match_bits = 0;
2223 break;
593 case 'o': { 2224 case 'o': {
594 FILE *fp = NULL;
595 fp = freopen(optarg, "w", stdout); 2225 if (freopen(optarg, "w", stdout) == NULL)
596 if (fp == NULL) 2226 errp("Could not freopen(%s)", optarg);
597 err("Could not open output stream '%s': %s", optarg, strerror(errno));
598 stdout = fp;
599 break; 2227 break;
600 } 2228 }
601
602 case 's': { 2229 case 'k':
603 size_t len; 2230 xarraypush_str(find_section_arr, optarg);
604 find_sym = strdup(optarg);
605 if (!find_sym) {
606 warnf("Could not malloc() mem for sym scan");
607 find_sym = NULL;
608 break; 2231 break;
609 } 2232 case 's':
610 len = strlen(find_sym) + 1; 2233 /* historically, this was comma delimited */
611 versioned_symname = (char *)malloc(sizeof(char) * (len+1)); 2234 parse_delimited(find_sym_arr, optarg, ",");
612 if (!versioned_symname) {
613 free(find_sym);
614 find_sym = NULL;
615 warnf("Could not malloc() mem for sym scan");
616 break; 2235 break;
617 } 2236 case 'N':
618 sprintf(versioned_symname, "%s@", find_sym); 2237 xarraypush_str(find_lib_arr, optarg);
2238 break;
2239 case 'F': {
2240 if (out_format) warn("You prob don't want to specify -F twice");
2241 out_format = optarg;
619 break; 2242 break;
620 } 2243 }
621
622 case 'F': { 2244 case 'z': {
623 out_format = strdup(optarg); 2245 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
624 if (!out_format) 2246 size_t x;
625 err("Could not malloc() mem for output format"); 2247
2248 for (x = 0; x < strlen(optarg); x++) {
2249 switch (optarg[x]) {
2250 case 'p':
2251 case 'P':
2252 do_pax_state(optarg[x], PAGEEXEC);
2253 break;
2254 case 's':
2255 case 'S':
2256 do_pax_state(optarg[x], SEGMEXEC);
2257 break;
2258 case 'm':
2259 case 'M':
2260 do_pax_state(optarg[x], MPROTECT);
2261 break;
2262 case 'e':
2263 case 'E':
2264 do_pax_state(optarg[x], EMUTRAMP);
2265 break;
2266 case 'r':
2267 case 'R':
2268 do_pax_state(optarg[x], RANDMMAP);
2269 break;
2270 case 'x':
2271 case 'X':
2272 do_pax_state(optarg[x], RANDEXEC);
2273 break;
2274 default:
2275 break;
2276 }
2277 }
2278 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
2279 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
2280 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
2281 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
2282 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
2283 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
2284 setpax = flags;
626 break; 2285 break;
627 } 2286 }
628 2287 case 'Z': show_size = 1; break;
2288 case 'g': ++g_match; break;
2289 case 'L': load_cache_config = use_ldcache = 1; break;
629 case 'y': scan_symlink = 0; break; 2290 case 'y': scan_symlink = 0; break;
2291 case 'A': scan_archives = 1; break;
2292 case 'C': color_init(true); break;
630 case 'B': show_banner = 0; break; 2293 case 'B': show_banner = 0; break;
631 case 'l': scan_ldpath = 1; break; 2294 case 'l': load_cache_config = scan_ldpath = 1; break;
632 case 'p': scan_envpath = 1; break; 2295 case 'p': scan_envpath = 1; break;
633 case 'R': dir_recurse = 1; break; 2296 case 'R': dir_recurse = 1; break;
634 case 'm': dir_crossmount = 0; break; 2297 case 'm': dir_crossmount = 0; break;
2298 case 'X': ++fix_elf; break;
635 case 'x': show_pax = 1; break; 2299 case 'x': show_pax = 1; break;
636 case 'e': show_stack = 1; break; 2300 case 'e': show_phdr = 1; break;
637 case 't': show_textrel = 1; break; 2301 case 't': show_textrel = 1; break;
638 case 'r': show_rpath = 1; break; 2302 case 'r': show_rpath = 1; break;
639 case 'n': show_needed = 1; break; 2303 case 'n': show_needed = 1; break;
640 case 'i': show_interp = 1; break; 2304 case 'i': show_interp = 1; break;
641 case 'q': be_quiet = 1; break; 2305 case 'b': show_bind = 1; break;
2306 case 'S': show_soname = 1; break;
2307 case 'T': show_textrels = 1; break;
2308 case 'q': be_quiet = min(be_quiet, 20) + 1; break;
642 case 'v': be_verbose = (be_verbose % 20) + 1; break; 2309 case 'v': be_verbose = min(be_verbose, 20) + 1; break;
643 case 'a': show_pax = show_stack = show_textrel = show_rpath = show_needed = show_interp = 1; break; 2310 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
644 2311 case 'D': show_endian = 1; break;
2312 case 'I': show_osabi = 1; break;
2313 case 'Y': show_eabi = 1; break;
2314 case 128:
2315 root_fd = open(optarg, O_RDONLY|O_CLOEXEC);
2316 if (root_fd == -1)
2317 err("Could not open root: %s", optarg);
2318 break;
2319 case 129: load_cache_config = use_ldpath = 1; break;
645 case ':': 2320 case ':':
646 warn("Option missing parameter\n"); 2321 err("Option '%c' is missing parameter", optopt);
647 usage(EXIT_FAILURE);
648 break;
649 case '?': 2322 case '?':
650 warn("Unknown option\n"); 2323 err("Unknown option '%c' or argument missing", optopt);
651 usage(EXIT_FAILURE);
652 break;
653 default: 2324 default:
654 err("Unhandled option '%c'", flag); 2325 err("Unhandled option '%c'; please report this", i);
655 break;
656 } 2326 }
657 } 2327 }
2328 if (show_textrels && be_verbose)
2329 objdump = which("objdump", "OBJDUMP");
2330 /* precompile all the regexes */
2331 if (g_match) {
2332 regex_t preg;
2333 const char *this_sym;
2334 size_t n;
2335 int flags = REG_EXTENDED | REG_NOSUB | (g_match > 1 ? REG_ICASE : 0);
658 2336
659 if (be_quiet && be_verbose) 2337 array_for_each(find_sym_arr, n, this_sym) {
660 err("You can be quiet or you can be verbose, not both, stupid"); 2338 /* see scanelf_match_symname for logic info */
2339 switch (this_sym[0]) {
2340 case '%':
2341 while (*(this_sym++))
2342 if (*this_sym == '%') {
2343 ++this_sym;
2344 break;
2345 }
2346 break;
2347 case '+':
2348 case '-':
2349 ++this_sym;
2350 break;
2351 }
2352 if (*this_sym == '*')
2353 ++this_sym;
661 2354
2355 ret = regcomp(&preg, this_sym, flags);
2356 if (ret) {
2357 char err[256];
2358 regerror(ret, &preg, err, sizeof(err));
2359 err("regcomp of %s failed: %s", this_sym, err);
2360 }
2361 xarraypush(find_sym_regex_arr, &preg, sizeof(preg));
2362 }
2363 }
2364 /* flatten arrays for display */
2365 find_sym = array_flatten_str(find_sym_arr);
2366 find_lib = array_flatten_str(find_lib_arr);
2367 find_section = array_flatten_str(find_section_arr);
662 /* let the format option override all other options */ 2368 /* let the format option override all other options */
663 if (out_format) { 2369 if (out_format) {
664 show_pax = show_stack = show_textrel = show_rpath = show_needed = show_interp = 0; 2370 show_pax = show_phdr = show_textrel = show_rpath = \
2371 show_needed = show_interp = show_bind = show_soname = \
2372 show_textrels = show_perms = show_endian = show_size = \
2373 show_osabi = show_eabi = 0;
665 for (flag=0; out_format[flag]; ++flag) { 2374 for (i = 0; out_format[i]; ++i) {
666 if (out_format[flag] != '%') continue; 2375 if (!IS_MODIFIER(out_format[i])) continue;
667 2376
668 switch (out_format[++flag]) { 2377 switch (out_format[++i]) {
2378 case '+': break;
669 case '%': break; 2379 case '%': break;
2380 case '#': break;
670 case 'F': break; 2381 case 'F': break;
2382 case 'p': break;
2383 case 'f': break;
2384 case 'k': break;
671 case 's': break; 2385 case 's': break;
2386 case 'N': break;
2387 case 'o': break;
2388 case 'a': break;
2389 case 'M': break;
2390 case 'Z': show_size = 1; break;
2391 case 'D': show_endian = 1; break;
2392 case 'I': show_osabi = 1; break;
2393 case 'Y': show_eabi = 1; break;
2394 case 'O': show_perms = 1; break;
672 case 'x': show_pax = 1; break; 2395 case 'x': show_pax = 1; break;
673 case 'e': show_stack = 1; break; 2396 case 'e': show_phdr = 1; break;
674 case 't': show_textrel = 1; break; 2397 case 't': show_textrel = 1; break;
675 case 'r': show_rpath = 1; break; 2398 case 'r': show_rpath = 1; break;
676 case 'n': show_needed = 1; break; 2399 case 'n': show_needed = 1; break;
677 case 'i': show_interp = 1; break; 2400 case 'i': show_interp = 1; break;
2401 case 'b': show_bind = 1; break;
2402 case 'S': show_soname = 1; break;
2403 case 'T': show_textrels = 1; break;
678 default: 2404 default:
679 err("Invalid format specifier '%c' (byte %i)", 2405 err("invalid format specifier '%c' (byte %i)",
680 out_format[flag], flag+1); 2406 out_format[i], i+1);
681 } 2407 }
682 } 2408 }
2409
2410 /* construct our default format */
2411 } else {
2412 size_t fmt_len = 30;
2413 out_format = xmalloc(sizeof(char) * fmt_len);
2414 *out_format = '\0';
2415 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
2416 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
2417 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
2418 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
2419 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
2420 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
2421 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
2422 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
2423 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
2424 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
2425 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
2426 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
2427 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
2428 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
2429 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
2430 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
2431 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
2432 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
2433 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
683 } 2434 }
2435 if (be_verbose > 2) printf("Format: %s\n", out_format);
684 2436
685 /* now lets actually do the scanning */ 2437 /* now lets actually do the scanning */
2438 if (load_cache_config)
2439 load_ld_cache_config(__PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
686 if (scan_ldpath) scanelf_ldpath(); 2440 if (scan_ldpath) scanelf_ldpath();
687 if (scan_envpath) scanelf_envpath(); 2441 if (scan_envpath) scanelf_envpath();
2442 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
2443 from_file = "-";
2444 if (from_file) {
2445 scanelf_from_file(from_file);
2446 from_file = *argv;
2447 }
688 if (optind == argc && !scan_ldpath && !scan_envpath) 2448 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
689 err("Nothing to scan !?"); 2449 err("Nothing to scan !?");
690 while (optind < argc) 2450 while (optind < argc) {
691 scanelf_dir(argv[optind++]); 2451 search_path = argv[optind++];
2452 ret = scanelf_dir(search_path);
2453 }
692 2454
2455#ifdef __PAX_UTILS_CLEANUP
693 /* clean up */ 2456 /* clean up */
694 if (find_sym) { 2457 xarrayfree(ldpaths);
2458 xarrayfree(find_sym_arr);
2459 xarrayfree(find_lib_arr);
2460 xarrayfree(find_section_arr);
695 free(find_sym); 2461 free(find_sym);
696 free(versioned_symname); 2462 free(find_lib);
2463 free(find_section);
2464 {
2465 size_t n;
2466 regex_t *preg;
2467 array_for_each(find_sym_regex_arr, n, preg)
2468 regfree(preg);
2469 xarrayfree(find_sym_regex_arr);
697 } 2470 }
698 if (out_format) free(out_format);
699}
700 2471
2472 if (ldcache != 0)
2473 munmap(ldcache, ldcache_size);
2474#endif
701 2475
2476 return ret;
2477}
2478
2479static char **get_split_env(const char *envvar)
2480{
2481 const char *delims = " \t\n";
2482 char **envvals = NULL;
2483 char *env, *s;
2484 int nentry;
2485
2486 if ((env = getenv(envvar)) == NULL)
2487 return NULL;
2488
2489 env = xstrdup(env);
2490 if (env == NULL)
2491 return NULL;
2492
2493 s = strtok(env, delims);
2494 if (s == NULL) {
2495 free(env);
2496 return NULL;
2497 }
2498
2499 nentry = 0;
2500 while (s != NULL) {
2501 ++nentry;
2502 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
2503 envvals[nentry-1] = s;
2504 s = strtok(NULL, delims);
2505 }
2506 envvals[nentry] = NULL;
2507
2508 /* don't want to free(env) as it contains the memory that backs
2509 * the envvals array of strings */
2510 return envvals;
2511}
2512
2513static void parseenv(void)
2514{
2515 color_init(false);
2516 qa_textrels = get_split_env("QA_TEXTRELS");
2517 qa_execstack = get_split_env("QA_EXECSTACK");
2518 qa_wx_load = get_split_env("QA_WX_LOAD");
2519}
2520
2521#ifdef __PAX_UTILS_CLEANUP
2522static void cleanup(void)
2523{
2524 free(out_format);
2525 free(qa_textrels);
2526 free(qa_execstack);
2527 free(qa_wx_load);
2528}
2529#endif
702 2530
703int main(int argc, char *argv[]) 2531int main(int argc, char *argv[])
704{ 2532{
2533 int ret;
705 if (argc < 2) 2534 if (argc < 2)
706 usage(EXIT_FAILURE); 2535 usage(EXIT_FAILURE);
2536 parseenv();
707 parseargs(argc, argv); 2537 ret = parseargs(argc, argv);
708 fclose(stdout); 2538 fclose(stdout);
709 return EXIT_SUCCESS; 2539#ifdef __PAX_UTILS_CLEANUP
2540 cleanup();
2541 warn("The calls to add/delete heap should be off:\n"
2542 "\t- 1 due to the out_buffer not being freed in scanelf_fileat()\n"
2543 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
2544#endif
2545 return ret;
710} 2546}
2547
2548/* Match filename against entries in matchlist, return TRUE
2549 * if the file is listed */
2550static int file_matches_list(const char *filename, char **matchlist)
2551{
2552 char **file;
2553 char *match;
2554 char buf[__PAX_UTILS_PATH_MAX];
2555
2556 if (matchlist == NULL)
2557 return 0;
2558
2559 for (file = matchlist; *file != NULL; file++) {
2560 if (search_path) {
2561 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2562 match = buf;
2563 } else {
2564 match = *file;
2565 }
2566 if (fnmatch(match, filename, 0) == 0)
2567 return 1;
2568 }
2569 return 0;
2570}

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