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

Diff of /pax-utils/scanelf.c

Parent Directory Parent Directory | Revision Log Revision Log | View Patch Patch

Revision 1.44 Revision 1.271
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 1.44 2005/05/10 22:54:25 vapier Exp $ 4 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.271 2015/02/22 00:10:27 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>
25#include <stdlib.h>
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
36#include "paxelf.h"
37
38static const char *rcsid = "$Id: scanelf.c,v 1.44 2005/05/10 22:54:25 vapier Exp $"; 10static const char rcsid[] = "$Id: scanelf.c,v 1.271 2015/02/22 00:10:27 vapier Exp $";
39#define argv0 "scanelf" 11const char argv0[] = "scanelf";
40 12
13#include "paxinc.h"
41 14
15#define IS_MODIFIER(c) (c == '%' || c == '#' || c == '+')
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[]);
50static char *xstrdup(char *s);
51static void *xmalloc(size_t size);
52static void xstrcat(char **dst, const char *src, size_t *curr_len);
53static inline void xchrcat(char **dst, const char append, size_t *curr_len);
54static int xemptybuffer(const char *buff);
55 19
56/* 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;
57static char scan_ldpath = 0; 23static char scan_ldpath = 0;
58static char scan_envpath = 0; 24static char scan_envpath = 0;
59static char scan_symlink = 1; 25static char scan_symlink = 1;
26static char scan_archives = 0;
60static char dir_recurse = 0; 27static char dir_recurse = 0;
61static char dir_crossmount = 1; 28static char dir_crossmount = 1;
62static char show_pax = 0; 29static char show_pax = 0;
30static char show_perms = 0;
63static char show_stack = 0; 31static char show_size = 0;
32static char show_phdr = 0;
64static char show_textrel = 0; 33static char show_textrel = 0;
65static char show_rpath = 0; 34static char show_rpath = 0;
66static char show_needed = 0; 35static char show_needed = 0;
67static char show_interp = 0; 36static char show_interp = 0;
37static char show_bind = 0;
38static char show_soname = 0;
39static char show_textrels = 0;
68static char show_banner = 1; 40static char show_banner = 1;
41static char show_endian = 0;
42static char show_osabi = 0;
43static char show_eabi = 0;
69static char be_quiet = 0; 44static char be_quiet = 0;
70static char be_verbose = 0; 45static char be_verbose = 0;
71static 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;
72static 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;
73 61
62static char **qa_textrels = NULL;
63static char **qa_execstack = NULL;
64static char **qa_wx_load = NULL;
65static int root_fd = AT_FDCWD;
74 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;
75 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
76/* 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#define GET_SYMTABS_DT(B) \
233 if (elf->elf_class == ELFCLASS ## B) { \
234 size_t i; \
235 static Elf ## B ## _Shdr sym_shdr, str_shdr; \
236 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
237 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
238 Elf ## B ## _Addr vsym, vstr, vhash, vgnu_hash; \
239 Elf ## B ## _Dyn *dyn; \
240 Elf ## B ## _Off offset; \
241 \
242 /* lookup symbols used at runtime with DT_SYMTAB / DT_STRTAB */ \
243 vsym = vstr = vhash = vgnu_hash = 0; \
244 memset(&sym_shdr, 0, sizeof(sym_shdr)); \
245 memset(&str_shdr, 0, sizeof(str_shdr)); \
246 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
247 if (EGET(phdr[i].p_type) != PT_DYNAMIC) \
248 continue; \
249 \
250 offset = EGET(phdr[i].p_offset); \
251 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
252 continue; \
253 \
254 dyn = DYN ## B (elf->vdata + offset); \
255 while (EGET(dyn->d_tag) != DT_NULL) { \
256 switch (EGET(dyn->d_tag)) { \
257 case DT_SYMTAB: vsym = EGET(dyn->d_un.d_val); break; \
258 case DT_SYMENT: sym_shdr.sh_entsize = dyn->d_un.d_val; break; \
259 case DT_STRTAB: vstr = EGET(dyn->d_un.d_val); break; \
260 case DT_STRSZ: str_shdr.sh_size = dyn->d_un.d_val; break; \
261 case DT_HASH: vhash = EGET(dyn->d_un.d_val); break; \
262 /*case DT_GNU_HASH: vgnu_hash = EGET(dyn->d_un.d_val); break;*/ \
263 } \
264 ++dyn; \
265 } \
266 if (vsym && vstr) \
267 break; \
268 } \
269 if (!vsym || !vstr || !(vhash || vgnu_hash)) \
270 return; \
271 \
272 /* calc offset into the ELF by finding the load addr of the syms */ \
273 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
274 Elf ## B ## _Addr vaddr = EGET(phdr[i].p_vaddr); \
275 Elf ## B ## _Addr filesz = EGET(phdr[i].p_filesz); \
276 offset = EGET(phdr[i].p_offset); \
277 \
278 if (EGET(phdr[i].p_type) != PT_LOAD) \
279 continue; \
280 \
281 if (vhash >= vaddr && vhash < vaddr + filesz) { \
282 /* Scan the hash table to see how many entries we have */ \
283 Elf32_Word max_sym_idx = 0; \
284 Elf32_Word *hashtbl = elf->vdata + offset + (vhash - vaddr); \
285 Elf32_Word b, nbuckets = EGET(hashtbl[0]); \
286 Elf32_Word nchains = EGET(hashtbl[1]); \
287 Elf32_Word *buckets = &hashtbl[2]; \
288 Elf32_Word *chains = &buckets[nbuckets]; \
289 Elf32_Word sym_idx; \
290 \
291 for (b = 0; b < nbuckets; ++b) { \
292 if (!buckets[b]) \
293 continue; \
294 for (sym_idx = buckets[b]; sym_idx < nchains && sym_idx; sym_idx = chains[sym_idx]) \
295 if (max_sym_idx < sym_idx) \
296 max_sym_idx = sym_idx; \
297 } \
298 ESET(sym_shdr.sh_size, sym_shdr.sh_entsize * max_sym_idx); \
299 } \
300 \
301 if (vsym >= vaddr && vsym < vaddr + filesz) { \
302 ESET(sym_shdr.sh_offset, offset + (vsym - vaddr)); \
303 *sym = &sym_shdr; \
304 } \
305 \
306 if (vstr >= vaddr && vstr < vaddr + filesz) { \
307 ESET(str_shdr.sh_offset, offset + (vstr - vaddr)); \
308 *str = &str_shdr; \
309 } \
310 } \
311 }
312 GET_SYMTABS_DT(32)
313 GET_SYMTABS_DT(64)
314}
315
77static char *scanelf_file_pax(elfobj *elf, char *found_pax) 316static char *scanelf_file_pax(elfobj *elf, char *found_pax)
78{ 317{
79 static char *paxflags; 318 static char ret[7];
319 unsigned long i, shown;
80 320
81 if (!show_pax) return NULL; 321 if (!show_pax) return NULL;
82 322
83 paxflags = pax_short_hf_flags(PAX_FLAGS(elf));
84 if (!be_quiet || (be_quiet && strncmp(paxflags, "PeMRxS", 6))) {
85 *found_pax = 1;
86 return paxflags;
87 }
88
89 return NULL;
90}
91static char *scanelf_file_stack(elfobj *elf, char *found_stack, char *found_relro)
92{
93 static char ret[8];
94 char *found;
95 unsigned long i, off, shown;
96
97 if (!show_stack) return NULL;
98
99 shown = 0; 323 shown = 0;
100 strcpy(ret, "--- ---"); 324 memset(&ret, 0, sizeof(ret));
101 325
102 if (elf->phdr) { 326 if (elf->phdr) {
103#define SHOW_STACK(B) \ 327#define SHOW_PAX(B) \
104 if (elf->elf_class == ELFCLASS ## B) { \ 328 if (elf->elf_class == ELFCLASS ## B) { \
105 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 329 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
106 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 330 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
107 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 331 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
108 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \ 332 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
109 found = found_stack; \
110 off = 0; \
111 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
112 found = found_relro; \
113 off = 3; \
114 } else \
115 continue; \ 333 continue; \
116 if (be_quiet && !(EGET(phdr[i].p_flags) & PF_X)) \ 334 if (fix_elf && setpax) { \
335 /* set the paxctl flags */ \
336 ESET(phdr[i].p_flags, setpax); \
337 } \
338 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
117 continue; \ 339 continue; \
118 memcpy(ret+off, gnu_short_stack_flags(EGET(phdr[i].p_flags)), 3); \ 340 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
119 *found = 1; \ 341 *found_pax = 1; \
120 ++shown; \ 342 ++shown; \
343 break; \
121 } \ 344 } \
122 } 345 }
123 SHOW_STACK(32) 346 SHOW_PAX(32)
124 SHOW_STACK(64) 347 SHOW_PAX(64)
348 }
349
350 /* Note: We do not support setting EI_PAX if not PT_PAX_FLAGS
351 * was found. This is known to break ELFs on glibc systems,
352 * and mainline PaX has deprecated use of this for a long time.
353 * We could support changing PT_GNU_STACK, but that doesn't
354 * seem like it's worth the effort. #411919
355 */
356
357 /* fall back to EI_PAX if no PT_PAX was found */
358 if (!*ret) {
359 static char *paxflags;
360 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
361 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
362 *found_pax = 1;
363 return (be_wewy_wewy_quiet ? NULL : paxflags);
125 } 364 }
365 strncpy(ret, paxflags, sizeof(ret));
366 }
126 367
127 if (be_quiet && !shown) 368 if (be_wewy_wewy_quiet || (be_quiet && !shown))
128 return NULL; 369 return NULL;
129 else 370 else
130 return ret; 371 return ret;
131} 372}
373
374static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
375{
376 static char ret[12];
377 char *found;
378 unsigned long i, shown, multi_stack, multi_relro, multi_load;
379
380 if (!show_phdr) return NULL;
381
382 memcpy(ret, "--- --- ---\0", 12);
383
384 shown = 0;
385 multi_stack = multi_relro = multi_load = 0;
386
387#define NOTE_GNU_STACK ".note.GNU-stack"
388#define SHOW_PHDR(B) \
389 if (elf->elf_class == ELFCLASS ## B) { \
390 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
391 Elf ## B ## _Off offset; \
392 uint32_t flags, check_flags; \
393 if (elf->phdr != NULL) { \
394 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
395 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
396 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
397 if (multi_stack++) \
398 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
399 if (file_matches_list(elf->filename, qa_execstack)) \
400 continue; \
401 found = found_phdr; \
402 offset = 0; \
403 check_flags = PF_X; \
404 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
405 if (multi_relro++) \
406 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
407 found = found_relro; \
408 offset = 4; \
409 check_flags = PF_X; \
410 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
411 if (file_matches_list(elf->filename, qa_wx_load)) \
412 continue; \
413 found = found_load; \
414 offset = 8; \
415 check_flags = PF_W|PF_X; \
416 } else \
417 continue; \
418 flags = EGET(phdr[i].p_flags); \
419 if (be_quiet && ((flags & check_flags) != check_flags)) \
420 continue; \
421 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
422 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
423 ret[3] = ret[7] = '!'; \
424 flags = EGET(phdr[i].p_flags); \
425 } \
426 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
427 *found = 1; \
428 ++shown; \
429 } \
430 } else if (elf->shdr != NULL) { \
431 /* no program headers which means this is prob an object file */ \
432 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
433 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
434 if ((void*)strtbl > elf->data_end) \
435 goto skip_this_shdr##B; \
436 /* let's flag -w/+x object files since the final ELF will most likely \
437 * need write access to the stack (who doesn't !?). so the combined \
438 * output will bring in +w automatically and that's bad. \
439 */ \
440 check_flags = /*SHF_WRITE|*/SHF_EXECINSTR; \
441 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
442 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
443 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
444 if (offset >= elf->len - sizeof(NOTE_GNU_STACK)) \
445 continue; \
446 if (!strcmp(elf->data + offset, NOTE_GNU_STACK)) { \
447 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
448 flags = EGET(shdr[i].sh_flags); \
449 if (be_quiet && ((flags & check_flags) != check_flags)) \
450 continue; \
451 ++*found_phdr; \
452 shown = 1; \
453 if (flags & SHF_WRITE) ret[0] = 'W'; \
454 if (flags & SHF_ALLOC) ret[1] = 'A'; \
455 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
456 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
457 break; \
458 } \
459 } \
460 skip_this_shdr##B: \
461 if (!multi_stack) { \
462 if (file_matches_list(elf->filename, qa_execstack)) \
463 return NULL; \
464 *found_phdr = 1; \
465 shown = 1; \
466 memcpy(ret, "!WX", 3); \
467 } \
468 } \
469 }
470 SHOW_PHDR(32)
471 SHOW_PHDR(64)
472
473 if (be_wewy_wewy_quiet || (be_quiet && !shown))
474 return NULL;
475 else
476 return ret;
477}
478
479/*
480 * See if this ELF contains a DT_TEXTREL tag in any of its
481 * PT_DYNAMIC sections.
482 */
132static char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 483static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
133{ 484{
134 static char *ret = "TEXTREL"; 485 static const char *ret = "TEXTREL";
135 unsigned long i; 486 unsigned long i;
136 487
137 if (!show_textrel) return NULL; 488 if (!show_textrel && !show_textrels) return NULL;
489
490 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
138 491
139 if (elf->phdr) { 492 if (elf->phdr) {
140#define SHOW_TEXTREL(B) \ 493#define SHOW_TEXTREL(B) \
141 if (elf->elf_class == ELFCLASS ## B) { \ 494 if (elf->elf_class == ELFCLASS ## B) { \
142 Elf ## B ## _Dyn *dyn; \ 495 Elf ## B ## _Dyn *dyn; \
143 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 496 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
144 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 497 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
145 Elf ## B ## _Off offset; \ 498 Elf ## B ## _Off offset; \
146 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 499 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
147 if (phdr[i].p_type != PT_DYNAMIC) continue; \ 500 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
148 offset = EGET(phdr[i].p_offset); \ 501 offset = EGET(phdr[i].p_offset); \
149 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 502 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
150 dyn = DYN ## B (elf->data + offset); \ 503 dyn = DYN ## B (elf->vdata + offset); \
151 while (EGET(dyn->d_tag) != DT_NULL) { \ 504 while (EGET(dyn->d_tag) != DT_NULL) { \
152 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \ 505 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
153 *found_textrel = 1; \ 506 *found_textrel = 1; \
154 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \ 507 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
155 return ret; \ 508 return (be_wewy_wewy_quiet ? NULL : ret); \
156 } \ 509 } \
157 ++dyn; \ 510 ++dyn; \
158 } \ 511 } \
159 } } 512 } }
160 SHOW_TEXTREL(32) 513 SHOW_TEXTREL(32)
161 SHOW_TEXTREL(64) 514 SHOW_TEXTREL(64)
162 } 515 }
163 516
164 if (be_quiet) 517 if (be_quiet || be_wewy_wewy_quiet)
165 return NULL; 518 return NULL;
166 else 519 else
167 return " - "; 520 return " - ";
168} 521}
522
523/*
524 * Scan the .text section to see if there are any relocations in it.
525 * Should rewrite this to check PT_LOAD sections that are marked
526 * Executable rather than the section named '.text'.
527 */
528static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
529{
530 unsigned long s, r, rmax;
531 void *symtab_void, *strtab_void, *text_void;
532
533 if (!show_textrels) return NULL;
534
535 /* don't search for TEXTREL's if the ELF doesn't have any */
536 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
537 if (!*found_textrel) return NULL;
538
539 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
540 text_void = elf_findsecbyname(elf, ".text");
541
542 if (symtab_void && strtab_void && text_void && elf->shdr) {
543#define SHOW_TEXTRELS(B) \
544 if (elf->elf_class == ELFCLASS ## B) { \
545 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
546 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
547 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
548 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
549 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
550 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
551 uint ## B ## _t memsz = EGET(text->sh_size); \
552 Elf ## B ## _Rel *rel; \
553 Elf ## B ## _Rela *rela; \
554 /* search the section headers for relocations */ \
555 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
556 uint32_t sh_type = EGET(shdr[s].sh_type); \
557 if (sh_type == SHT_REL) { \
558 rel = REL ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
559 rela = NULL; \
560 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
561 } else if (sh_type == SHT_RELA) { \
562 rel = NULL; \
563 rela = RELA ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
564 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
565 } else \
566 continue; \
567 /* now see if any of the relocs are in the .text */ \
568 for (r = 0; r < rmax; ++r) { \
569 unsigned long sym_max; \
570 Elf ## B ## _Addr offset_tmp; \
571 Elf ## B ## _Sym *func; \
572 Elf ## B ## _Sym *sym; \
573 Elf ## B ## _Addr r_offset; \
574 uint ## B ## _t r_info; \
575 if (sh_type == SHT_REL) { \
576 r_offset = EGET(rel[r].r_offset); \
577 r_info = EGET(rel[r].r_info); \
578 } else { \
579 r_offset = EGET(rela[r].r_offset); \
580 r_info = EGET(rela[r].r_info); \
581 } \
582 /* make sure this relocation is inside of the .text */ \
583 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
584 if (be_verbose <= 2) continue; \
585 } else \
586 *found_textrels = 1; \
587 /* locate this relocation symbol name */ \
588 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
589 if ((void*)sym > elf->data_end) { \
590 warn("%s: corrupt ELF symbol", elf->filename); \
591 continue; \
592 } \
593 sym_max = ELF ## B ## _R_SYM(r_info); \
594 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
595 sym += sym_max; \
596 else \
597 sym = NULL; \
598 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
599 /* show the raw details about this reloc */ \
600 printf(" %s: ", elf->base_filename); \
601 if (sym && sym->st_name) \
602 printf("%s", elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
603 else \
604 printf("(memory/data?)"); \
605 printf(" [0x%lX]", (unsigned long)r_offset); \
606 /* now try to find the closest symbol that this rel is probably in */ \
607 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
608 func = NULL; \
609 offset_tmp = 0; \
610 while (sym_max--) { \
611 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
612 func = sym; \
613 offset_tmp = EGET(sym->st_value); \
614 } \
615 ++sym; \
616 } \
617 printf(" in "); \
618 if (func && func->st_name) { \
619 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
620 if (r_offset > EGET(func->st_size)) \
621 printf("(optimized out: previous %s)", func_name); \
622 else \
623 printf("%s", func_name); \
624 } else \
625 printf("(optimized out)"); \
626 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
627 if (be_verbose && objdump) { \
628 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
629 char *sysbuf; \
630 size_t syslen; \
631 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"; \
632 syslen = sizeof(sysfmt) + strlen(objdump) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
633 sysbuf = xmalloc(syslen); \
634 if (end_addr < r_offset) \
635 /* not uncommon when things are optimized out */ \
636 end_addr = r_offset + 0x100; \
637 snprintf(sysbuf, syslen, sysfmt, \
638 objdump, \
639 (unsigned long)offset_tmp, \
640 (unsigned long)end_addr, \
641 elf->filename, \
642 (unsigned long)r_offset); \
643 fflush(stdout); \
644 if (system(sysbuf)) {/* don't care */} \
645 fflush(stdout); \
646 free(sysbuf); \
647 } \
648 } \
649 } }
650 SHOW_TEXTRELS(32)
651 SHOW_TEXTRELS(64)
652 }
653 if (!*found_textrels)
654 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
655
656 return NULL;
657}
658
659static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
660{
661 struct stat st;
662 switch (*item) {
663 case '/': break;
664 case '.':
665 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
666 break;
667 case ':':
668 case '\0':
669 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
670 break;
671 case '$':
672 if (fstat(elf->fd, &st) != -1)
673 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
674 warnf("Security problem with %s='%s' in %s with mode set of %o",
675 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
676 break;
677 default:
678 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
679 break;
680 }
681 if (fix_elf)
682 warnf("Note: RPATH has been automatically fixed, but this should be fixed in the package itself");
683}
169static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len) 684static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
170{ 685{
171 /* TODO: if be_quiet, only output RPATH's which aren't in /etc/ld.so.conf */
172 unsigned long i; 686 unsigned long i;
173 char *rpath, *runpath; 687 char *rpath, *runpath, **r;
174 void *strtbl_void; 688 void *strtbl_void;
175 689
176 if (!show_rpath) return; 690 if (!show_rpath) return;
177 691
178 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 692 strtbl_void = elf_findsecbyname(elf, ".dynstr");
184 Elf ## B ## _Dyn *dyn; \ 698 Elf ## B ## _Dyn *dyn; \
185 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 699 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
186 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 700 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
187 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 701 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
188 Elf ## B ## _Off offset; \ 702 Elf ## B ## _Off offset; \
703 Elf ## B ## _Xword word; \
704 /* Scan all the program headers */ \
189 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 705 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
706 /* Just scan dynamic headers */ \
190 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 707 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
191 offset = EGET(phdr[i].p_offset); \ 708 offset = EGET(phdr[i].p_offset); \
192 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 709 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
710 /* Just scan dynamic RPATH/RUNPATH headers */ \
193 dyn = DYN ## B (elf->data + offset); \ 711 dyn = DYN ## B (elf->vdata + offset); \
194 while (EGET(dyn->d_tag) != DT_NULL) { \ 712 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
195 if (EGET(dyn->d_tag) == DT_RPATH) { \ 713 if (word == DT_RPATH) { \
196 if (rpath) warn("ELF has multiple DT_RPATH's !?"); \ 714 r = &rpath; \
715 } else if (word == DT_RUNPATH) { \
716 r = &runpath; \
717 } else { \
718 ++dyn; \
719 continue; \
720 } \
721 /* Verify the memory is somewhat sane */ \
197 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 722 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
198 if (offset >= elf->len) continue; \ 723 if (offset < (Elf ## B ## _Off)elf->len) { \
724 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
199 rpath = (char*)(elf->data + offset); \ 725 *r = elf->data + offset; \
726 /* cache the length in case we need to nuke this section later on */ \
727 if (fix_elf) \
728 offset = strlen(*r); \
729 /* If quiet, don't output paths in ld.so.conf */ \
730 if (be_quiet) { \
731 size_t len; \
732 char *start, *end; \
733 /* note that we only 'chop' off leading known paths. */ \
734 /* since *r is read-only memory, we can only move the ptr forward. */ \
735 start = *r; \
736 /* scan each path in : delimited list */ \
737 while (start) { \
738 rpath_security_checks(elf, start, get_elfdtype(word)); \
739 end = strchr(start, ':'); \
740 len = (end ? abs(end - start) : strlen(start)); \
741 if (use_ldcache) { \
742 size_t n; \
743 const char *ldpath; \
744 array_for_each(ldpaths, n, ldpath) \
745 if (!strncmp(ldpath, start, len) && !ldpath[len]) { \
746 *r = end; \
747 /* corner case ... if RPATH reads "/usr/lib:", we want \
748 * to show ':' rather than '' */ \
749 if (end && end[1] != '\0') \
750 (*r)++; \
751 break; \
752 } \
753 } \
754 if (!*r || !end) \
755 break; \
756 else \
757 start = start + len + 1; \
758 } \
759 } \
760 if (*r) { \
761 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
762 /* just nuke it */ \
763 nuke_it##B: \
764 memset(*r, 0x00, offset); \
765 *r = NULL; \
766 ESET(dyn->d_tag, DT_DEBUG); \
767 ESET(dyn->d_un.d_ptr, 0); \
768 } else if (fix_elf) { \
769 /* try to clean "bad" paths */ \
770 size_t len, tmpdir_len; \
771 char *start, *end; \
772 const char *tmpdir; \
773 start = *r; \
774 tmpdir = (getenv("TMPDIR") ? : "."); \
775 tmpdir_len = strlen(tmpdir); \
776 while (1) { \
777 end = strchr(start, ':'); \
778 if (start == end) { \
779 eat_this_path##B: \
780 len = strlen(end); \
781 memmove(start, end+1, len); \
782 start[len-1] = '\0'; \
783 end = start - 1; \
784 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
785 if (!end) { \
786 if (start == *r) \
787 goto nuke_it##B; \
788 *--start = '\0'; \
789 } else \
790 goto eat_this_path##B; \
791 } \
792 if (!end) \
793 break; \
794 start = end + 1; \
795 } \
796 if (**r == '\0') \
797 goto nuke_it##B; \
798 } \
799 if (*r) \
200 *found_rpath = 1; \ 800 *found_rpath = 1; \
201 } else if (EGET(dyn->d_tag) == DT_RUNPATH) { \ 801 } \
202 if (runpath) warn("ELF has multiple DT_RUNPATH's !?"); \
203 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
204 if (offset >= elf->len) continue; \
205 runpath = (char*)(elf->data + offset); \
206 *found_rpath = 1; \
207 } \ 802 } \
208 ++dyn; \ 803 ++dyn; \
209 } \ 804 } \
210 } } 805 } }
211 SHOW_RPATH(32) 806 SHOW_RPATH(32)
212 SHOW_RPATH(64) 807 SHOW_RPATH(64)
213 } 808 }
809
810 if (be_wewy_wewy_quiet) return;
214 811
215 if (rpath && runpath) { 812 if (rpath && runpath) {
216 if (!strcmp(rpath, runpath)) { 813 if (!strcmp(rpath, runpath)) {
217 xstrcat(ret, runpath, ret_len); 814 xstrcat(ret, runpath, ret_len);
218 } else { 815 } else {
226 } else if (rpath || runpath) 823 } else if (rpath || runpath)
227 xstrcat(ret, (runpath ? runpath : rpath), ret_len); 824 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
228 else if (!be_quiet) 825 else if (!be_quiet)
229 xstrcat(ret, " - ", ret_len); 826 xstrcat(ret, " - ", ret_len);
230} 827}
828
829/* Defines can be seen in glibc's sysdeps/generic/ldconfig.h */
830#define LDSO_CACHE_MAGIC "ld.so-"
831#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
832#define LDSO_CACHE_VER "1.7.0"
833#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
834#define FLAG_ANY -1
835#define FLAG_TYPE_MASK 0x00ff
836#define FLAG_LIBC4 0x0000
837#define FLAG_ELF 0x0001
838#define FLAG_ELF_LIBC5 0x0002
839#define FLAG_ELF_LIBC6 0x0003
840#define FLAG_REQUIRED_MASK 0xff00
841#define FLAG_SPARC_LIB64 0x0100
842#define FLAG_IA64_LIB64 0x0200
843#define FLAG_X8664_LIB64 0x0300
844#define FLAG_S390_LIB64 0x0400
845#define FLAG_POWERPC_LIB64 0x0500
846#define FLAG_MIPS64_LIBN32 0x0600
847#define FLAG_MIPS64_LIBN64 0x0700
848#define FLAG_X8664_LIBX32 0x0800
849#define FLAG_ARM_LIBHF 0x0900
850#define FLAG_AARCH64_LIB64 0x0a00
851
852#if defined(__GLIBC__) || defined(__UCLIBC__)
853
854static char *lookup_cache_lib(elfobj *elf, const char *fname)
855{
856 int fd;
857 char *strs;
858 static char buf[__PAX_UTILS_PATH_MAX] = "";
859 const char *cachefile = root_rel_path("/etc/ld.so.cache");
860 struct stat st;
861
862 typedef struct {
863 char magic[LDSO_CACHE_MAGIC_LEN];
864 char version[LDSO_CACHE_VER_LEN];
865 int nlibs;
866 } header_t;
867 header_t *header;
868
869 typedef struct {
870 int flags;
871 int sooffset;
872 int liboffset;
873 } libentry_t;
874 libentry_t *libent;
875
876 if (fname == NULL)
877 return NULL;
878
879 if (ldcache == NULL) {
880 if (fstatat(root_fd, cachefile, &st, 0))
881 return NULL;
882
883 fd = openat(root_fd, cachefile, O_RDONLY);
884 if (fd == -1)
885 return NULL;
886
887 /* cache these values so we only map/unmap the cache file once */
888 ldcache_size = st.st_size;
889 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
890 close(fd);
891
892 if (ldcache == MAP_FAILED) {
893 ldcache = NULL;
894 return NULL;
895 }
896
897 if (memcmp(header->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN) ||
898 memcmp(header->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
899 {
900 munmap(ldcache, ldcache_size);
901 ldcache = NULL;
902 return NULL;
903 }
904 } else
905 header = ldcache;
906
907 libent = ldcache + sizeof(header_t);
908 strs = (char *) &libent[header->nlibs];
909
910 for (fd = 0; fd < header->nlibs; ++fd) {
911 /* This should be more fine grained, but for now we assume that
912 * diff arches will not be cached together, and we ignore the
913 * the different multilib mips cases.
914 */
915 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
916 continue;
917 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
918 continue;
919
920 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
921 continue;
922
923 /* Return first hit because that is how the ldso rolls */
924 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
925 break;
926 }
927
928 return buf;
929}
930
931#elif defined(__NetBSD__)
932static char *lookup_cache_lib(elfobj *elf, const char *fname)
933{
934 static char buf[__PAX_UTILS_PATH_MAX] = "";
935 static struct stat st;
936 size_t n;
937 char *ldpath;
938
939 array_for_each(ldpath, n, ldpath) {
940 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", ldpath, fname) >= sizeof(buf))
941 continue; /* if the pathname is too long, or something went wrong, ignore */
942
943 if (stat(buf, &st) != 0)
944 continue; /* if the lib doesn't exist in *ldpath, look further */
945
946 /* NetBSD doesn't actually do sanity checks, it just loads the file
947 * and if that doesn't work, continues looking in other directories.
948 * This cannot easily be safely emulated, unfortunately. For now,
949 * just assume that if it exists, it's a valid library. */
950
951 return buf;
952 }
953
954 /* not found in any path */
955 return NULL;
956}
957#else
958#ifdef __ELF__
959#warning Cache support not implemented for your target
960#endif
961static char *lookup_cache_lib(elfobj *elf, const char *fname)
962{
963 return NULL;
964}
965#endif
966
967static char *lookup_config_lib(const char *fname)
968{
969 static char buf[__PAX_UTILS_PATH_MAX] = "";
970 const char *ldpath;
971 size_t n;
972
973 array_for_each(ldpaths, n, ldpath) {
974 snprintf(buf, sizeof(buf), "%s/%s", root_rel_path(ldpath), fname);
975 if (faccessat(root_fd, buf, F_OK, AT_SYMLINK_NOFOLLOW) == 0)
976 return buf;
977 }
978
979 return NULL;
980}
981
231static void scanelf_file_needed(elfobj *elf, char *found_needed, char **ret, size_t *ret_len) 982static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
232{ 983{
233 unsigned long i; 984 unsigned long i;
234 char *needed; 985 char *needed;
235 void *strtbl_void; 986 void *strtbl_void;
987 char *p;
236 988
237 if (!show_needed) return; 989 /*
990 * -n -> op==0 -> print all
991 * -N -> op==1 -> print requested
992 */
993 if ((op == 0 && !show_needed) || (op == 1 && !find_lib))
994 return NULL;
238 995
239 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 996 strtbl_void = elf_findsecbyname(elf, ".dynstr");
240 997
241 if (elf->phdr && strtbl_void) { 998 if (elf->phdr && strtbl_void) {
242#define SHOW_NEEDED(B) \ 999#define SHOW_NEEDED(B) \
244 Elf ## B ## _Dyn *dyn; \ 1001 Elf ## B ## _Dyn *dyn; \
245 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 1002 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
246 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 1003 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
247 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 1004 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
248 Elf ## B ## _Off offset; \ 1005 Elf ## B ## _Off offset; \
1006 size_t matched = 0; \
1007 /* Walk all the program headers to find the PT_DYNAMIC */ \
249 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 1008 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
250 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 1009 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) \
1010 continue; \
251 offset = EGET(phdr[i].p_offset); \ 1011 offset = EGET(phdr[i].p_offset); \
252 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 1012 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
1013 continue; \
1014 /* Walk all the dynamic tags to find NEEDED entries */ \
253 dyn = DYN ## B (elf->data + offset); \ 1015 dyn = DYN ## B (elf->vdata + offset); \
254 while (EGET(dyn->d_tag) != DT_NULL) { \ 1016 while (EGET(dyn->d_tag) != DT_NULL) { \
255 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 1017 if (EGET(dyn->d_tag) == DT_NEEDED) { \
256 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 1018 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
257 if (offset >= elf->len) continue; \ 1019 if (offset >= (Elf ## B ## _Off)elf->len) { \
1020 ++dyn; \
1021 continue; \
1022 } \
258 needed = (char*)(elf->data + offset); \ 1023 needed = elf->data + offset; \
1024 if (op == 0) { \
1025 /* -n -> print all entries */ \
1026 if (!be_wewy_wewy_quiet) { \
259 if (*found_needed) xchrcat(ret, ',', ret_len); \ 1027 if (*found_needed) xchrcat(ret, ',', ret_len); \
1028 if (use_ldpath) { \
1029 if ((p = lookup_config_lib(needed)) != NULL) \
1030 needed = p; \
1031 } else if (use_ldcache) { \
1032 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
1033 needed = p; \
1034 } \
260 xstrcat(ret, needed, ret_len); \ 1035 xstrcat(ret, needed, ret_len); \
1036 } \
261 *found_needed = 1; \ 1037 *found_needed = 1; \
1038 } else { \
1039 /* -N -> print matching entries */ \
1040 size_t n; \
1041 const char *find_lib_name; \
1042 \
1043 array_for_each(find_lib_arr, n, find_lib_name) { \
1044 int invert = 1; \
1045 if (find_lib_name[0] == '!') \
1046 invert = 0, ++find_lib_name; \
1047 if (!strcmp(find_lib_name, needed) == invert) \
1048 ++matched; \
1049 } \
1050 \
1051 if (matched == array_cnt(find_lib_arr)) { \
1052 *found_lib = 1; \
1053 return (be_wewy_wewy_quiet ? NULL : find_lib); \
1054 } \
1055 } \
262 } \ 1056 } \
263 ++dyn; \ 1057 ++dyn; \
264 } \ 1058 } \
265 } } 1059 } }
266 SHOW_NEEDED(32) 1060 SHOW_NEEDED(32)
267 SHOW_NEEDED(64) 1061 SHOW_NEEDED(64)
1062 if (op == 0 && !*found_needed && be_verbose)
1063 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
268 } 1064 }
1065
1066 return NULL;
269} 1067}
270static char *scanelf_file_interp(elfobj *elf, char *found_interp) 1068static char *scanelf_file_interp(elfobj *elf, char *found_interp)
271{ 1069{
272 void *strtbl_void; 1070 void *strtbl_void;
273 1071
278 if (strtbl_void) { 1076 if (strtbl_void) {
279#define SHOW_INTERP(B) \ 1077#define SHOW_INTERP(B) \
280 if (elf->elf_class == ELFCLASS ## B) { \ 1078 if (elf->elf_class == ELFCLASS ## B) { \
281 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 1079 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
282 *found_interp = 1; \ 1080 *found_interp = 1; \
283 return elf->data + EGET(strtbl->sh_offset); \ 1081 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
284 } 1082 }
285 SHOW_INTERP(32) 1083 SHOW_INTERP(32)
286 SHOW_INTERP(64) 1084 SHOW_INTERP(64)
1085 } else {
1086 /* Walk all the program headers to find the PT_INTERP */
1087#define SHOW_PT_INTERP(B) \
1088 if (elf->elf_class == ELFCLASS ## B) { \
1089 unsigned long i; \
1090 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1091 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1092 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1093 if (EGET(phdr[i].p_type) != PT_INTERP) \
1094 continue; \
1095 *found_interp = 1; \
1096 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(phdr[i].p_offset)); \
1097 } \
287 } 1098 }
1099 SHOW_PT_INTERP(32)
1100 SHOW_PT_INTERP(64)
1101 }
1102
288 return NULL; 1103 return NULL;
289} 1104}
290static char *scanelf_file_sym(elfobj *elf, char *found_sym, const char *filename) 1105static const char *scanelf_file_bind(elfobj *elf, char *found_bind)
291{ 1106{
292 unsigned long i; 1107 unsigned long i;
1108 struct stat s;
1109 bool dynamic = false;
1110
1111 if (!show_bind) return NULL;
1112 if (!elf->phdr) return NULL;
1113
1114#define SHOW_BIND(B) \
1115 if (elf->elf_class == ELFCLASS ## B) { \
1116 Elf ## B ## _Dyn *dyn; \
1117 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1118 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1119 Elf ## B ## _Off offset; \
1120 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1121 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1122 dynamic = true; \
1123 offset = EGET(phdr[i].p_offset); \
1124 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
1125 dyn = DYN ## B (elf->vdata + offset); \
1126 while (EGET(dyn->d_tag) != DT_NULL) { \
1127 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
1128 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
1129 { \
1130 if (be_quiet) return NULL; \
1131 *found_bind = 1; \
1132 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
1133 } \
1134 ++dyn; \
1135 } \
1136 } \
1137 }
1138 SHOW_BIND(32)
1139 SHOW_BIND(64)
1140
1141 if (be_wewy_wewy_quiet) return NULL;
1142
1143 /* don't output anything if quiet mode and the ELF is static or not setuid */
1144 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
1145 return NULL;
1146 } else {
1147 *found_bind = 1;
1148 return dynamic ? "LAZY" : "STATIC";
1149 }
1150}
1151static char *scanelf_file_soname(elfobj *elf, char *found_soname)
1152{
1153 unsigned long i;
1154 char *soname;
1155 void *strtbl_void;
1156
1157 if (!show_soname) return NULL;
1158
1159 strtbl_void = elf_findsecbyname(elf, ".dynstr");
1160
1161 if (elf->phdr && strtbl_void) {
1162#define SHOW_SONAME(B) \
1163 if (elf->elf_class == ELFCLASS ## B) { \
1164 Elf ## B ## _Dyn *dyn; \
1165 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1166 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1167 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
1168 Elf ## B ## _Off offset; \
1169 /* only look for soname in shared objects */ \
1170 if (EGET(ehdr->e_type) != ET_DYN) \
1171 return NULL; \
1172 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1173 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1174 offset = EGET(phdr[i].p_offset); \
1175 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
1176 dyn = DYN ## B (elf->vdata + offset); \
1177 while (EGET(dyn->d_tag) != DT_NULL) { \
1178 if (EGET(dyn->d_tag) == DT_SONAME) { \
1179 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
1180 if (offset >= (Elf ## B ## _Off)elf->len) { \
1181 ++dyn; \
1182 continue; \
1183 } \
1184 soname = elf->data + offset; \
1185 *found_soname = 1; \
1186 return (be_wewy_wewy_quiet ? NULL : soname); \
1187 } \
1188 ++dyn; \
1189 } \
1190 } }
1191 SHOW_SONAME(32)
1192 SHOW_SONAME(64)
1193 }
1194
1195 return NULL;
1196}
1197
1198/*
1199 * We support the symbol form:
1200 * [%[modifiers]%][[+-]<symbol name>][,[.....]]
1201 * If the symbol name is empty, then all symbols are matched.
1202 * If the symbol name is a glob ("*"), then all symbols are dumped (debug).
1203 * Do not rely on this output format at all.
1204 * Otherwise the symbol name is used to search (either regex or string compare).
1205 * If the first char of the symbol name is a plus ("+"), then only match
1206 * defined symbols. If it's a minus ("-"), only match undefined symbols.
1207 * Putting modifiers in between the percent signs allows for more in depth
1208 * filters. There are groups of modifiers. If you don't specify a member
1209 * of a group, then all types in that group are matched. The current
1210 * groups and their types are:
1211 * STT group: STT_NOTYPE:n STT_OBJECT:o STT_FUNC:f STT_FILE:F
1212 * STB group: STB_LOCAL:l STB_GLOBAL:g STB_WEAK:w
1213 * STV group: STV_DEFAULT:p STV_INTERNAL:i STV_HIDDEN:h STV_PROTECTED:P
1214 * SHN group: SHN_UNDEF:u SHN_ABS:a SHN_COMMON:c {defined}:d
1215 * The "defined" value in the SHN group does not correspond to a SHN_xxx define.
1216 * You can search for multiple symbols at once by seperating with a comma (",").
1217 *
1218 * Some examples:
1219 * ELFs with a weak function "foo":
1220 * scanelf -s %wf%foo <ELFs>
1221 * ELFs that define the symbol "main":
1222 * scanelf -s +main <ELFs>
1223 * scanelf -s %d%main <ELFs>
1224 * ELFs that refer to the undefined symbol "brk":
1225 * scanelf -s -brk <ELFs>
1226 * scanelf -s %u%brk <ELFs>
1227 * All global defined objects in an ELF:
1228 * scanelf -s %ogd% <ELF>
1229 */
1230static void
1231scanelf_match_symname(elfobj *elf, char *found_sym, char **ret, size_t *ret_len, const char *symname,
1232 unsigned int stt, unsigned int stb, unsigned int stv, unsigned int shn, unsigned long size)
1233{
1234 const char *this_sym;
1235 size_t n;
1236
1237 array_for_each(find_sym_arr, n, this_sym) {
1238 bool inc_notype, inc_object, inc_func, inc_file,
1239 inc_local, inc_global, inc_weak,
1240 inc_visdef, inc_intern, inc_hidden, inc_prot,
1241 inc_def, inc_undef, inc_abs, inc_common;
1242
1243 /* symbol selection! */
1244 inc_notype = inc_object = inc_func = inc_file =
1245 inc_local = inc_global = inc_weak =
1246 inc_visdef = inc_intern = inc_hidden = inc_prot =
1247 inc_def = inc_undef = inc_abs = inc_common =
1248 (*this_sym != '%');
1249
1250 /* parse the contents of %...% */
1251 if (!inc_notype) {
1252 while (*(this_sym++)) {
1253 if (*this_sym == '%') {
1254 ++this_sym;
1255 break;
1256 }
1257 switch (*this_sym) {
1258 case 'n': inc_notype = true; break;
1259 case 'o': inc_object = true; break;
1260 case 'f': inc_func = true; break;
1261 case 'F': inc_file = true; break;
1262 case 'l': inc_local = true; break;
1263 case 'g': inc_global = true; break;
1264 case 'w': inc_weak = true; break;
1265 case 'p': inc_visdef = true; break;
1266 case 'i': inc_intern = true; break;
1267 case 'h': inc_hidden = true; break;
1268 case 'P': inc_prot = true; break;
1269 case 'd': inc_def = true; break;
1270 case 'u': inc_undef = true; break;
1271 case 'a': inc_abs = true; break;
1272 case 'c': inc_common = true; break;
1273 default: err("invalid symbol selector '%c'", *this_sym);
1274 }
1275 }
1276
1277 /* If no types are matched, not match all */
1278 if (!inc_notype && !inc_object && !inc_func && !inc_file)
1279 inc_notype = inc_object = inc_func = inc_file = true;
1280 if (!inc_local && !inc_global && !inc_weak)
1281 inc_local = inc_global = inc_weak = true;
1282 if (!inc_visdef && !inc_intern && !inc_hidden && !inc_prot)
1283 inc_visdef = inc_intern = inc_hidden = inc_prot = true;
1284 if (!inc_def && !inc_undef && !inc_abs && !inc_common)
1285 inc_def = inc_undef = inc_abs = inc_common = true;
1286
1287 /* backwards compat for defined/undefined short hand */
1288 } else if (*this_sym == '+') {
1289 inc_undef = false;
1290 ++this_sym;
1291 } else if (*this_sym == '-') {
1292 inc_def = inc_abs = inc_common = false;
1293 ++this_sym;
1294 }
1295
1296 /* filter symbols */
1297 if ((!inc_notype && stt == STT_NOTYPE ) || \
1298 (!inc_object && stt == STT_OBJECT ) || \
1299 (!inc_func && stt == STT_FUNC ) || \
1300 (!inc_file && stt == STT_FILE ) || \
1301 (!inc_local && stb == STB_LOCAL ) || \
1302 (!inc_global && stb == STB_GLOBAL ) || \
1303 (!inc_weak && stb == STB_WEAK ) || \
1304 (!inc_visdef && stv == STV_DEFAULT ) || \
1305 (!inc_intern && stv == STV_INTERNAL ) || \
1306 (!inc_hidden && stv == STV_HIDDEN ) || \
1307 (!inc_prot && stv == STV_PROTECTED) || \
1308 (!inc_def && shn && shn < SHN_LORESERVE) || \
1309 (!inc_undef && shn == SHN_UNDEF ) || \
1310 (!inc_abs && shn == SHN_ABS ) || \
1311 (!inc_common && shn == SHN_COMMON ))
1312 continue;
1313
1314 if (*this_sym == '*') {
1315 /* a "*" symbol gets you debug output */
1316 printf("%s(%s) %5lX %-15s %-15s %-15s %-15s %s\n",
1317 ((*found_sym == 0) ? "\n\t" : "\t"),
1318 elf->base_filename,
1319 size,
1320 get_elfstttype(stt),
1321 get_elfstbtype(stb),
1322 get_elfstvtype(stv),
1323 get_elfshntype(shn),
1324 symname);
1325 goto matched;
1326
1327 } else {
1328 if (g_match) {
1329 /* regex match the symbol */
1330 if (regexec(find_sym_regex_arr->eles[n], symname, 0, NULL, 0) == REG_NOMATCH)
1331 continue;
1332
1333 } else if (*this_sym) {
1334 /* give empty symbols a "pass", else do a normal compare */
1335 const size_t len = strlen(this_sym);
1336 if (!(strncmp(this_sym, symname, len) == 0 &&
1337 /* Accept unversioned symbol names */
1338 (symname[len] == '\0' || symname[len] == '@')))
1339 continue;
1340 }
1341
1342 if (be_semi_verbose) {
1343 char buf[1024];
1344 snprintf(buf, sizeof(buf), "%lX %s %s",
1345 size,
1346 get_elfstttype(stt),
1347 this_sym);
1348 *ret = xstrdup(buf);
1349 } else {
1350 if (*ret) xchrcat(ret, ',', ret_len);
1351 xstrcat(ret, symname, ret_len);
1352 }
1353
1354 goto matched;
1355 }
1356 }
1357
1358 return;
1359
1360 matched:
1361 *found_sym = 1;
1362}
1363
1364static const char *scanelf_file_sym(elfobj *elf, char *found_sym)
1365{
1366 char *ret;
293 void *symtab_void, *strtab_void; 1367 void *symtab_void, *strtab_void;
294 1368
295 if (!find_sym) return NULL; 1369 if (!find_sym) return NULL;
1370 ret = NULL;
296 1371
297 symtab_void = elf_findsecbyname(elf, ".symtab"); 1372 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
298 strtab_void = elf_findsecbyname(elf, ".strtab");
299 1373
300 if (symtab_void && strtab_void) { 1374 if (symtab_void && strtab_void) {
301#define FIND_SYM(B) \ 1375#define FIND_SYM(B) \
302 if (elf->elf_class == ELFCLASS ## B) { \ 1376 if (elf->elf_class == ELFCLASS ## B) { \
303 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 1377 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
304 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 1378 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
305 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 1379 Elf ## B ## _Sym *sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
306 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 1380 Elf ## B ## _Word i, cnt = EGET(symtab->sh_entsize); \
307 char *symname; \ 1381 char *symname; \
1382 size_t ret_len = 0; \
1383 if (cnt) \
1384 cnt = EGET(symtab->sh_size) / cnt; \
308 for (i = 0; i < cnt; ++i) { \ 1385 for (i = 0; i < cnt; ++i) { \
1386 if ((void*)sym > elf->data_end) { \
1387 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1388 goto break_out; \
1389 } \
309 if (sym->st_name) { \ 1390 if (sym->st_name) { \
1391 /* make sure the symbol name is in acceptable memory range */ \
310 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 1392 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
311 if (*find_sym == '*') { \ 1393 if ((void*)symname > elf->data_end) { \
312 printf("%s(%s) %5lX %15s %s\n", \ 1394 warnf("%s: corrupt ELF symbols", elf->filename); \
313 ((*found_sym == 0) ? "\n\t" : "\t"), \ 1395 ++sym; \
314 (char *)basename(filename), \ 1396 continue; \
315 (long)sym->st_size, \ 1397 } \
316 (char *)get_elfstttype(sym->st_info), \ 1398 scanelf_match_symname(elf, found_sym, \
317 symname); \ 1399 &ret, &ret_len, symname, \
318 *found_sym = 1; \ 1400 ELF##B##_ST_TYPE(EGET(sym->st_info)), \
319 } else if ((strcmp(find_sym, symname) == 0) || \ 1401 ELF##B##_ST_BIND(EGET(sym->st_info)), \
320 (strcmp(symname, versioned_symname) == 0)) \ 1402 ELF##B##_ST_VISIBILITY(EGET(sym->st_other)), \
321 (*found_sym)++; \ 1403 EGET(sym->st_shndx), \
1404 /* st_size can be 64bit, but no one is really that big, so screw em */ \
1405 EGET(sym->st_size)); \
322 } \ 1406 } \
323 ++sym; \ 1407 ++sym; \
324 } } 1408 } \
1409 }
325 FIND_SYM(32) 1410 FIND_SYM(32)
326 FIND_SYM(64) 1411 FIND_SYM(64)
327 } 1412 }
1413
1414break_out:
1415 if (be_wewy_wewy_quiet) return NULL;
1416
328 if (*find_sym != '*' && *found_sym) 1417 if (*find_sym != '*' && *found_sym)
329 return find_sym; 1418 return ret;
330 if (be_quiet) 1419 if (be_quiet)
331 return NULL; 1420 return NULL;
332 else 1421 else
333 return " - "; 1422 return " - ";
334} 1423}
1424
1425static const char *scanelf_file_sections(elfobj *elf, char *found_section)
1426{
1427 if (!find_section)
1428 return NULL;
1429
1430#define FIND_SECTION(B) \
1431 if (elf->elf_class == ELFCLASS ## B) { \
1432 size_t matched, n; \
1433 int invert; \
1434 const char *section_name; \
1435 Elf ## B ## _Shdr *section; \
1436 \
1437 matched = 0; \
1438 array_for_each(find_section_arr, n, section_name) { \
1439 invert = (*section_name == '!' ? 1 : 0); \
1440 section = SHDR ## B (elf_findsecbyname(elf, section_name + invert)); \
1441 if ((section == NULL && invert) || (section != NULL && !invert)) \
1442 ++matched; \
1443 } \
1444 \
1445 if (matched == array_cnt(find_section_arr)) \
1446 *found_section = 1; \
1447 }
1448 FIND_SECTION(32)
1449 FIND_SECTION(64)
1450
1451 if (be_wewy_wewy_quiet)
1452 return NULL;
1453
1454 if (*found_section)
1455 return find_section;
1456
1457 if (be_quiet)
1458 return NULL;
1459 else
1460 return " - ";
1461}
1462
335/* scan an elf file and show all the fun stuff */ 1463/* scan an elf file and show all the fun stuff */
336#define prints(str) fputs(str, stdout) 1464#define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
337static void scanelf_file(const char *filename) 1465static int scanelf_elfobj(elfobj *elf)
338{ 1466{
339 unsigned long i; 1467 unsigned long i;
340 char found_pax, found_stack, found_relro, found_textrel, 1468 char found_pax, found_phdr, found_relro, found_load, found_textrel,
341 found_rpath, found_needed, found_interp, found_sym, 1469 found_rpath, found_needed, found_interp, found_bind, found_soname,
342 found_file; 1470 found_sym, found_lib, found_file, found_textrels, found_section;
343 elfobj *elf;
344 struct stat st;
345 static char *out_buffer = NULL; 1471 static char *out_buffer = NULL;
346 static size_t out_len; 1472 static size_t out_len;
347 1473
348 /* make sure 'filename' exists */
349 if (lstat(filename, &st) == -1) {
350 if (be_verbose > 2) printf("%s: does not exist\n", filename);
351 return;
352 }
353 /* always handle regular files and handle symlinked files if no -y */
354 if (!(S_ISREG(st.st_mode) || (S_ISLNK(st.st_mode) && scan_symlink))) {
355 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
356 return;
357 }
358
359 found_pax = found_stack = found_relro = found_textrel = \ 1474 found_pax = found_phdr = found_relro = found_load = found_textrel = \
360 found_rpath = found_needed = found_interp = found_sym = \ 1475 found_rpath = found_needed = found_interp = found_bind = found_soname = \
361 found_file = 0; 1476 found_sym = found_lib = found_file = found_textrels = found_section = 0;
362 1477
363 /* verify this is real ELF */
364 if ((elf = readelf(filename)) == NULL) {
365 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
366 return;
367 }
368
369 if (be_verbose > 1) 1478 if (be_verbose > 2)
370 printf("%s: scanning file {%s,%s}\n", filename, 1479 printf("%s: scanning file {%s,%s}\n", elf->filename,
371 get_elfeitype(elf, EI_CLASS, elf->elf_class), 1480 get_elfeitype(EI_CLASS, elf->elf_class),
372 get_elfeitype(elf, EI_DATA, elf->data[EI_DATA])); 1481 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
373 else if (be_verbose) 1482 else if (be_verbose > 1)
374 printf("%s: scanning file\n", filename); 1483 printf("%s: scanning file\n", elf->filename);
375 1484
376 /* init output buffer */ 1485 /* init output buffer */
377 if (!out_buffer) { 1486 if (!out_buffer) {
378 out_len = sizeof(char) * 80; 1487 out_len = sizeof(char) * 80;
379 out_buffer = (char*)xmalloc(out_len); 1488 out_buffer = xmalloc(out_len);
380 } 1489 }
381 *out_buffer = '\0'; 1490 *out_buffer = '\0';
382 1491
383 /* show the header */ 1492 /* show the header */
384 if (!be_quiet && show_banner) { 1493 if (!be_quiet && show_banner) {
385 for (i=0; out_format[i]; ++i) { 1494 for (i = 0; out_format[i]; ++i) {
386 if (out_format[i] != '%') continue; 1495 if (!IS_MODIFIER(out_format[i])) continue;
387 1496
388 switch (out_format[++i]) { 1497 switch (out_format[++i]) {
1498 case '+': break;
389 case '%': break; 1499 case '%': break;
1500 case '#': break;
1501 case 'F':
1502 case 'p':
390 case 'F': prints("FILE "); break; 1503 case 'f': prints("FILE "); found_file = 1; break;
391 case 'o': prints(" TYPE "); break; 1504 case 'o': prints(" TYPE "); break;
392 case 'x': prints(" PAX "); break; 1505 case 'x': prints(" PAX "); break;
393 case 'e': prints("STK/REL "); break; 1506 case 'e': prints("STK/REL/PTL "); break;
394 case 't': prints("TEXTREL "); break; 1507 case 't': prints("TEXTREL "); break;
395 case 'r': prints("RPATH "); break; 1508 case 'r': prints("RPATH "); break;
1509 case 'M': prints("CLASS "); break;
1510 case 'l':
396 case 'n': prints("NEEDED "); break; 1511 case 'n': prints("NEEDED "); break;
397 case 'i': prints("INTERP "); break; 1512 case 'i': prints("INTERP "); break;
1513 case 'b': prints("BIND "); break;
1514 case 'Z': prints("SIZE "); break;
1515 case 'S': prints("SONAME "); break;
398 case 's': prints("SYM "); break; 1516 case 's': prints("SYM "); break;
1517 case 'N': prints("LIB "); break;
1518 case 'T': prints("TEXTRELS "); break;
1519 case 'k': prints("SECTION "); break;
1520 case 'a': prints("ARCH "); break;
1521 case 'I': prints("OSABI "); break;
1522 case 'Y': prints("EABI "); break;
1523 case 'O': prints("PERM "); break;
1524 case 'D': prints("ENDIAN "); break;
1525 default: warnf("'%c' has no title ?", out_format[i]);
399 } 1526 }
400 } 1527 }
1528 if (!found_file) prints("FILE ");
401 prints("\n"); 1529 prints("\n");
1530 found_file = 0;
402 show_banner = 0; 1531 show_banner = 0;
403 } 1532 }
404 1533
405 /* dump all the good stuff */ 1534 /* dump all the good stuff */
406 for (i=0; out_format[i]; ++i) { 1535 for (i = 0; out_format[i]; ++i) {
407 const char *out; 1536 const char *out;
408 1537 const char *tmp;
409 /* make sure we trim leading spaces in quiet mode */ 1538 static char ubuf[sizeof(unsigned long)*2];
410 if (be_quiet && *out_buffer == ' ' && !out_buffer[1]) 1539 if (!IS_MODIFIER(out_format[i])) {
411 *out_buffer = '\0';
412
413 if (out_format[i] != '%') {
414 xchrcat(&out_buffer, out_format[i], &out_len); 1540 xchrcat(&out_buffer, out_format[i], &out_len);
415 continue; 1541 continue;
416 } 1542 }
417 1543
418 out = NULL; 1544 out = NULL;
1545 be_wewy_wewy_quiet = (out_format[i] == '#');
1546 be_semi_verbose = (out_format[i] == '+');
419 switch (out_format[++i]) { 1547 switch (out_format[++i]) {
1548 case '+':
1549 case '%':
1550 case '#':
420 case '%': xchrcat(&out_buffer, '%', &out_len); break; 1551 xchrcat(&out_buffer, out_format[i], &out_len); break;
421 case 'F': found_file = 1; xstrcat(&out_buffer, filename, &out_len); break; 1552 case 'F':
1553 found_file = 1;
1554 if (be_wewy_wewy_quiet) break;
1555 xstrcat(&out_buffer, elf->filename, &out_len);
1556 break;
1557 case 'p':
1558 found_file = 1;
1559 if (be_wewy_wewy_quiet) break;
1560 tmp = elf->filename;
1561 if (search_path) {
1562 ssize_t len_search = strlen(search_path);
1563 ssize_t len_file = strlen(elf->filename);
1564 if (!strncmp(elf->filename, search_path, len_search) && \
1565 len_file > len_search)
1566 tmp += len_search;
1567 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1568 }
1569 xstrcat(&out_buffer, tmp, &out_len);
1570 break;
1571 case 'f':
1572 found_file = 1;
1573 if (be_wewy_wewy_quiet) break;
1574 tmp = strrchr(elf->filename, '/');
1575 tmp = (tmp == NULL ? elf->filename : tmp+1);
1576 xstrcat(&out_buffer, tmp, &out_len);
1577 break;
422 case 'o': out = get_elfetype(elf); break; 1578 case 'o': out = get_elfetype(elf); break;
423 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1579 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
424 case 'e': out = scanelf_file_stack(elf, &found_stack, &found_relro); break; 1580 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
425 case 't': out = scanelf_file_textrel(elf, &found_textrel); break; 1581 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1582 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
426 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break; 1583 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1584 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1585 case 'D': out = get_endian(elf); break;
1586 case 'O': out = strfileperms(elf->filename); break;
1587 case 'n':
427 case 'n': scanelf_file_needed(elf, &found_needed, &out_buffer, &out_len); break; 1588 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
428 case 'i': out = scanelf_file_interp(elf, &found_interp); break; 1589 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1590 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1591 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
429 case 's': out = scanelf_file_sym(elf, &found_sym, filename); break; 1592 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1593 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1594 case 'a': out = get_elfemtype(elf); break;
1595 case 'I': out = get_elfosabi(elf); break;
1596 case 'Y': out = get_elf_eabi(elf); break;
1597 case 'Z': snprintf(ubuf, sizeof(ubuf), "%lu", (unsigned long)elf->len); out = ubuf; break;;
1598 default: warnf("'%c' has no scan code?", out_format[i]);
430 } 1599 }
1600 if (out)
431 if (out) xstrcat(&out_buffer, out, &out_len); 1601 xstrcat(&out_buffer, out, &out_len);
432 } 1602 }
433 1603
434 if (!found_file) { 1604#define FOUND_SOMETHING() \
435 if (!be_quiet || found_pax || found_stack || found_textrel || \ 1605 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
436 found_rpath || found_needed || found_interp || found_sym) 1606 found_rpath || found_needed || found_interp || found_bind || \
1607 found_soname || found_sym || found_lib || found_textrels || found_section )
1608
1609 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1610 xchrcat(&out_buffer, ' ', &out_len);
437 xstrcat(&out_buffer, filename, &out_len); 1611 xstrcat(&out_buffer, elf->filename, &out_len);
438 } 1612 }
439 if (!(be_quiet && xemptybuffer(out_buffer))) 1613 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
440 puts(out_buffer); 1614 puts(out_buffer);
1615 fflush(stdout);
1616 }
441 1617
1618 return 0;
1619}
1620
1621/* scan a single elf */
1622static int scanelf_elf(const char *filename, int fd, size_t len)
1623{
1624 int ret = 1;
1625 size_t n;
1626 const char *match_etype;
1627 elfobj *elf;
1628
1629 /* Verify this is a real ELF */
1630 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1631 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1632 return 2;
1633 }
1634
1635 /* Possibly filter based on ELF bitness */
1636 switch (match_bits) {
1637 case 32:
1638 if (elf->elf_class != ELFCLASS32)
1639 goto done;
1640 break;
1641 case 64:
1642 if (elf->elf_class != ELFCLASS64)
1643 goto done;
1644 break;
1645 }
1646
1647 /* Possibly filter based on the ELF's e_type field */
1648 array_for_each(match_etypes, n, match_etype)
1649 if (etype_lookup(match_etype) == get_etype(elf))
1650 goto scanit;
1651 if (array_cnt(match_etypes))
1652 goto done;
1653
1654 scanit:
1655 ret = scanelf_elfobj(elf);
1656
1657 done:
442 unreadelf(elf); 1658 unreadelf(elf);
1659 return ret;
1660}
1661
1662/* scan an archive of elfs */
1663static int scanelf_archive(const char *filename, int fd, size_t len)
1664{
1665 archive_handle *ar;
1666 archive_member *m;
1667 char *ar_buffer;
1668 elfobj *elf;
1669
1670 ar = ar_open_fd(filename, fd);
1671 if (ar == NULL)
1672 return 1;
1673
1674 ar_buffer = mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1675 while ((m = ar_next(ar)) != NULL) {
1676 off_t cur_pos = lseek(fd, 0, SEEK_CUR);
1677 if (cur_pos == -1)
1678 errp("lseek() failed");
1679 elf = readelf_buffer(m->name, ar_buffer + cur_pos, m->size);
1680 if (elf) {
1681 scanelf_elfobj(elf);
1682 unreadelf(elf);
1683 }
1684 }
1685 munmap(ar_buffer, len);
1686
1687 return 0;
1688}
1689/* scan a file which may be an elf or an archive or some other magical beast */
1690static int scanelf_fileat(int dir_fd, const char *filename, const struct stat *st_cache)
1691{
1692 const struct stat *st = st_cache;
1693 struct stat symlink_st;
1694 int fd;
1695
1696 /* always handle regular files and handle symlinked files if no -y */
1697 if (S_ISLNK(st->st_mode)) {
1698 if (!scan_symlink)
1699 return 1;
1700 fstatat(dir_fd, filename, &symlink_st, 0);
1701 st = &symlink_st;
1702 }
1703
1704 if (!S_ISREG(st->st_mode)) {
1705 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1706 return 1;
1707 }
1708
1709 if (match_perms) {
1710 if ((st->st_mode | match_perms) != st->st_mode)
1711 return 1;
1712 }
1713 fd = openat(dir_fd, filename, (fix_elf ? O_RDWR : O_RDONLY) | O_CLOEXEC);
1714 if (fd == -1) {
1715 if (fix_elf && errno == ETXTBSY)
1716 warnp("%s: could not fix", filename);
1717 else if (be_verbose > 2)
1718 printf("%s: skipping file: %s\n", filename, strerror(errno));
1719 return 1;
1720 }
1721
1722 if (scanelf_elf(filename, fd, st->st_size) == 2) {
1723 /* if it isn't an ELF, maybe it's an .a archive */
1724 if (scan_archives)
1725 scanelf_archive(filename, fd, st->st_size);
1726
1727 /*
1728 * unreadelf() implicitly closes its fd, so only close it
1729 * when we are returning it in the non-ELF case
1730 */
1731 close(fd);
1732 }
1733
1734 return 0;
443} 1735}
444 1736
445/* scan a directory for ET_EXEC files and print when we find one */ 1737/* scan a directory for ET_EXEC files and print when we find one */
446static void scanelf_dir(const char *path) 1738static int scanelf_dirat(int dir_fd, const char *path)
447{ 1739{
448 register DIR *dir; 1740 register DIR *dir;
449 register struct dirent *dentry; 1741 register struct dirent *dentry;
450 struct stat st_top, st; 1742 struct stat st_top, st;
451 char buf[_POSIX_PATH_MAX]; 1743 char buf[__PAX_UTILS_PATH_MAX], *subpath;
452 size_t pathlen = 0, len = 0; 1744 size_t pathlen = 0, len = 0;
1745 int ret = 0;
1746 int subdir_fd;
453 1747
454 /* make sure path exists */ 1748 /* make sure path exists */
455 if (lstat(path, &st_top) == -1) { 1749 if (fstatat(dir_fd, path, &st_top, AT_SYMLINK_NOFOLLOW) == -1) {
456 if (be_verbose > 2) printf("%s: does not exist\n", path); 1750 if (be_verbose > 2) printf("%s: does not exist\n", path);
457 return; 1751 return 1;
458 } 1752 }
459 1753
460 /* ok, if it isn't a directory, assume we can open it */ 1754 /* ok, if it isn't a directory, assume we can open it */
461 if (!S_ISDIR(st_top.st_mode)) { 1755 if (!S_ISDIR(st_top.st_mode))
462 scanelf_file(path); 1756 return scanelf_fileat(dir_fd, path, &st_top);
463 return;
464 }
465 1757
466 /* now scan the dir looking for fun stuff */ 1758 /* now scan the dir looking for fun stuff */
467 if ((dir = opendir(path)) == NULL) { 1759 subdir_fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
468 warnf("could not opendir %s: %s", path, strerror(errno)); 1760 if (subdir_fd == -1)
1761 dir = NULL;
1762 else
1763 dir = fdopendir(subdir_fd);
1764 if (dir == NULL) {
1765 if (subdir_fd != -1)
1766 close(subdir_fd);
1767 else if (be_verbose > 2)
1768 printf("%s: skipping dir: %s\n", path, strerror(errno));
469 return; 1769 return 1;
470 } 1770 }
471 if (be_verbose) printf("%s: scanning dir\n", path); 1771 if (be_verbose > 1) printf("%s: scanning dir\n", path);
472 1772
473 pathlen = strlen(path); 1773 subpath = stpcpy(buf, path);
1774 if (subpath[-1] != '/')
1775 *subpath++ = '/';
1776 pathlen = subpath - buf;
474 while ((dentry = readdir(dir))) { 1777 while ((dentry = readdir(dir))) {
475 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1778 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
476 continue; 1779 continue;
1780
1781 if (fstatat(subdir_fd, dentry->d_name, &st, AT_SYMLINK_NOFOLLOW) == -1)
1782 continue;
1783
477 len = (pathlen + 1 + strlen(dentry->d_name) + 1); 1784 len = strlen(dentry->d_name);
478 if (len >= sizeof(buf)) { 1785 if (len + pathlen + 1 >= sizeof(buf)) {
479 warnf("Skipping '%s': len > sizeof(buf); %d > %d\n", path, (int)len, (int)sizeof(buf)); 1786 warnf("Skipping '%s%s': len > sizeof(buf); %zu > %zu\n",
1787 path, dentry->d_name, len + pathlen + 1, sizeof(buf));
480 continue; 1788 continue;
481 } 1789 }
482 sprintf(buf, "%s/%s", path, dentry->d_name); 1790 memcpy(subpath, dentry->d_name, len);
483 if (lstat(buf, &st) != -1) { 1791 subpath[len] = '\0';
1792
484 if (S_ISREG(st.st_mode)) 1793 if (S_ISREG(st.st_mode))
485 scanelf_file(buf); 1794 ret = scanelf_fileat(dir_fd, buf, &st);
486 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1795 else if (dir_recurse && S_ISDIR(st.st_mode)) {
487 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1796 if (dir_crossmount || (st_top.st_dev == st.st_dev))
488 scanelf_dir(buf); 1797 ret = scanelf_dirat(dir_fd, buf);
1798 }
1799 }
1800 closedir(dir);
1801
1802 return ret;
1803}
1804static int scanelf_dir(const char *path)
1805{
1806 return scanelf_dirat(root_fd, root_rel_path(path));
1807}
1808
1809static int scanelf_from_file(const char *filename)
1810{
1811 FILE *fp;
1812 char *p, *path;
1813 size_t len;
1814 int ret;
1815
1816 if (strcmp(filename, "-") == 0)
1817 fp = stdin;
1818 else if ((fp = fopen(filename, "r")) == NULL)
1819 return 1;
1820
1821 path = NULL;
1822 len = 0;
1823 ret = 0;
1824 while (getline(&path, &len, fp) != -1) {
1825 if ((p = strchr(path, '\n')) != NULL)
1826 *p = 0;
1827 search_path = path;
1828 ret = scanelf_dir(path);
1829 }
1830 free(path);
1831
1832 if (fp != stdin)
1833 fclose(fp);
1834
1835 return ret;
1836}
1837
1838#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1839
1840static int _load_ld_cache_config(const char *fname)
1841{
1842 FILE *fp = NULL;
1843 char *p, *path;
1844 size_t len;
1845 int curr_fd = -1;
1846
1847 fp = fopenat_r(root_fd, root_rel_path(fname));
1848 if (fp == NULL)
1849 return -1;
1850
1851 path = NULL;
1852 len = 0;
1853 while (getline(&path, &len, fp) != -1) {
1854 if ((p = strrchr(path, '\r')) != NULL)
1855 *p = 0;
1856 if ((p = strchr(path, '\n')) != NULL)
1857 *p = 0;
1858
1859 /* recursive includes of the same file will make this segfault. */
1860 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1861 glob_t gl;
1862 size_t x;
1863 const char *gpath;
1864
1865 /* re-use existing path buffer ... need to be creative */
1866 if (path[8] != '/')
1867 gpath = memcpy(path + 3, "/etc/", 5);
1868 else
1869 gpath = path + 8;
1870 if (root_fd != AT_FDCWD) {
1871 if (curr_fd == -1) {
1872 curr_fd = open(".", O_RDONLY|O_CLOEXEC);
1873 if (fchdir(root_fd))
1874 errp("unable to change to root dir");
1875 }
1876 gpath = root_rel_path(gpath);
489 } 1877 }
1878
1879 if (glob(gpath, 0, NULL, &gl) == 0) {
1880 for (x = 0; x < gl.gl_pathc; ++x) {
1881 /* try to avoid direct loops */
1882 if (strcmp(gl.gl_pathv[x], fname) == 0)
1883 continue;
1884 _load_ld_cache_config(gl.gl_pathv[x]);
1885 }
1886 globfree(&gl);
1887 }
1888
1889 /* failed globs are ignored by glibc */
1890 continue;
490 } 1891 }
1892
1893 if (*path != '/')
1894 continue;
1895
1896 xarraypush_str(ldpaths, path);
491 } 1897 }
492 closedir(dir); 1898 free(path);
1899
1900 fclose(fp);
1901
1902 if (curr_fd != -1) {
1903 if (fchdir(curr_fd))
1904 {/* don't care */}
1905 close(curr_fd);
1906 }
1907
1908 return 0;
1909}
1910
1911#elif defined(__FreeBSD__) || defined(__DragonFly__)
1912
1913static int _load_ld_cache_config(const char *fname)
1914{
1915 FILE *fp = NULL;
1916 char *b = NULL, *p;
1917 struct elfhints_hdr hdr;
1918
1919 fp = fopenat_r(root_fd, root_rel_path(fname));
1920 if (fp == NULL)
1921 return -1;
1922
1923 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1924 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1925 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1926 {
1927 fclose(fp);
1928 return -1;
1929 }
1930
1931 b = xmalloc(hdr.dirlistlen + 1);
1932 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1933 fclose(fp);
1934 free(b);
1935 return -1;
1936 }
1937
1938 while ((p = strsep(&b, ":"))) {
1939 if (*p == '\0')
1940 continue;
1941 xarraypush_str(ldpaths, p);
1942 }
1943
1944 free(b);
1945 fclose(fp);
1946 return 0;
1947}
1948
1949#else
1950#ifdef __ELF__
1951#warning Cache config support not implemented for your target
1952#endif
1953static int _load_ld_cache_config(const char *fname)
1954{
1955 return 0;
1956}
1957#endif
1958
1959static void load_ld_cache_config(const char *fname)
1960{
1961 bool scan_l, scan_ul, scan_ull;
1962 size_t n;
1963 const char *ldpath;
1964
1965 _load_ld_cache_config(fname);
1966
1967 scan_l = scan_ul = scan_ull = false;
1968 array_for_each(ldpaths, n, ldpath) {
1969 if (!scan_l && !strcmp(ldpath, "/lib")) scan_l = true;
1970 if (!scan_ul && !strcmp(ldpath, "/usr/lib")) scan_ul = true;
1971 if (!scan_ull && !strcmp(ldpath, "/usr/local/lib")) scan_ull = true;
1972 }
1973
1974 if (!scan_l) xarraypush_str(ldpaths, "/lib");
1975 if (!scan_ul) xarraypush_str(ldpaths, "/usr/lib");
1976 if (!scan_ull) xarraypush_str(ldpaths, "/usr/local/lib");
493} 1977}
494 1978
495/* scan /etc/ld.so.conf for paths */ 1979/* scan /etc/ld.so.conf for paths */
496static void scanelf_ldpath() 1980static void scanelf_ldpath(void)
497{ 1981{
498 char scan_l, scan_ul, scan_ull; 1982 size_t n;
499 char *path, *p; 1983 const char *ldpath;
500 FILE *fp;
501 1984
502 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1985 array_for_each(ldpaths, n, ldpath)
503 err("Unable to open ld.so.conf: %s", strerror(errno));
504
505 scan_l = scan_ul = scan_ull = 0;
506
507 path = (char*)xmalloc(_POSIX_PATH_MAX);
508 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL)
509 if (*path == '/') {
510 if ((p = strrchr(path, '\r')) != NULL)
511 *p = 0;
512 if ((p = strrchr(path, '\n')) != NULL)
513 *p = 0;
514 if (!scan_l && !strcmp(path, "/lib")) scan_l = 1;
515 if (!scan_ul && !strcmp(path, "/usr/lib")) scan_ul = 1;
516 if (!scan_ull && !strcmp(path, "/usr/local/lib")) scan_ull = 1;
517 scanelf_dir(path); 1986 scanelf_dir(ldpath);
518 }
519 free(path);
520 fclose(fp);
521
522 if (!scan_l) scanelf_dir("/lib");
523 if (!scan_ul) scanelf_dir("/usr/lib");
524 if (!scan_ull) scanelf_dir("/usr/local/lib");
525} 1987}
526 1988
527/* scan env PATH for paths */ 1989/* scan env PATH for paths */
528static void scanelf_envpath() 1990static void scanelf_envpath(void)
529{ 1991{
530 char *path, *p; 1992 char *path, *p;
531 1993
532 path = getenv("PATH"); 1994 path = getenv("PATH");
533 if (!path) 1995 if (!path)
540 } 2002 }
541 2003
542 free(path); 2004 free(path);
543} 2005}
544 2006
545 2007/* usage / invocation handling functions */ /* Free Flags: c d j u w G H J K P Q U W */
546
547/* usage / invocation handling functions */
548#define PARSE_FLAGS "plRmyxetrnis:aqvF:o:BhV" 2008#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZCBhV"
549#define a_argument required_argument 2009#define a_argument required_argument
550static struct option const long_opts[] = { 2010static struct option const long_opts[] = {
551 {"path", no_argument, NULL, 'p'}, 2011 {"path", no_argument, NULL, 'p'},
552 {"ldpath", no_argument, NULL, 'l'}, 2012 {"ldpath", no_argument, NULL, 'l'},
2013 {"use-ldpath",no_argument, NULL, 129},
2014 {"root", a_argument, NULL, 128},
553 {"recursive", no_argument, NULL, 'R'}, 2015 {"recursive", no_argument, NULL, 'R'},
554 {"mount", no_argument, NULL, 'm'}, 2016 {"mount", no_argument, NULL, 'm'},
555 {"symlink", no_argument, NULL, 'y'}, 2017 {"symlink", no_argument, NULL, 'y'},
2018 {"archives", no_argument, NULL, 'A'},
2019 {"ldcache", no_argument, NULL, 'L'},
2020 {"fix", no_argument, NULL, 'X'},
2021 {"setpax", a_argument, NULL, 'z'},
556 {"pax", no_argument, NULL, 'x'}, 2022 {"pax", no_argument, NULL, 'x'},
557 {"header", no_argument, NULL, 'e'}, 2023 {"header", no_argument, NULL, 'e'},
558 {"textrel", no_argument, NULL, 't'}, 2024 {"textrel", no_argument, NULL, 't'},
559 {"rpath", no_argument, NULL, 'r'}, 2025 {"rpath", no_argument, NULL, 'r'},
560 {"needed", no_argument, NULL, 'n'}, 2026 {"needed", no_argument, NULL, 'n'},
561 {"interp", no_argument, NULL, 'i'}, 2027 {"interp", no_argument, NULL, 'i'},
2028 {"bind", no_argument, NULL, 'b'},
2029 {"soname", no_argument, NULL, 'S'},
562 {"symbol", a_argument, NULL, 's'}, 2030 {"symbol", a_argument, NULL, 's'},
2031 {"section", a_argument, NULL, 'k'},
2032 {"lib", a_argument, NULL, 'N'},
2033 {"gmatch", no_argument, NULL, 'g'},
2034 {"textrels", no_argument, NULL, 'T'},
2035 {"etype", a_argument, NULL, 'E'},
2036 {"bits", a_argument, NULL, 'M'},
2037 {"endian", no_argument, NULL, 'D'},
2038 {"osabi", no_argument, NULL, 'I'},
2039 {"eabi", no_argument, NULL, 'Y'},
2040 {"perms", a_argument, NULL, 'O'},
2041 {"size", no_argument, NULL, 'Z'},
563 {"all", no_argument, NULL, 'a'}, 2042 {"all", no_argument, NULL, 'a'},
564 {"quiet", no_argument, NULL, 'q'}, 2043 {"quiet", no_argument, NULL, 'q'},
565 {"verbose", no_argument, NULL, 'v'}, 2044 {"verbose", no_argument, NULL, 'v'},
566 {"format", a_argument, NULL, 'F'}, 2045 {"format", a_argument, NULL, 'F'},
2046 {"from", a_argument, NULL, 'f'},
567 {"file", a_argument, NULL, 'o'}, 2047 {"file", a_argument, NULL, 'o'},
2048 {"nocolor", no_argument, NULL, 'C'},
568 {"nobanner", no_argument, NULL, 'B'}, 2049 {"nobanner", no_argument, NULL, 'B'},
569 {"help", no_argument, NULL, 'h'}, 2050 {"help", no_argument, NULL, 'h'},
570 {"version", no_argument, NULL, 'V'}, 2051 {"version", no_argument, NULL, 'V'},
571 {NULL, no_argument, NULL, 0x0} 2052 {NULL, no_argument, NULL, 0x0}
572}; 2053};
2054
573static char *opts_help[] = { 2055static const char * const opts_help[] = {
574 "Scan all directories in PATH environment", 2056 "Scan all directories in PATH environment",
575 "Scan all directories in /etc/ld.so.conf", 2057 "Scan all directories in /etc/ld.so.conf",
2058 "Use ld.so.conf to show full path (use with -r/-n)",
2059 "Root directory (use with -l or -p)",
576 "Scan directories recursively", 2060 "Scan directories recursively",
577 "Don't recursively cross mount points", 2061 "Don't recursively cross mount points",
578 "Don't scan symlinks\n", 2062 "Don't scan symlinks",
2063 "Scan archives (.a files)",
2064 "Utilize ld.so.cache to show full path (use with -r/-n)",
2065 "Try and 'fix' bad things (use with -r/-e)",
2066 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
579 "Print PaX markings", 2067 "Print PaX markings",
580 "Print GNU_STACK markings", 2068 "Print GNU_STACK/PT_LOAD markings",
581 "Print TEXTREL information", 2069 "Print TEXTREL information",
582 "Print RPATH information", 2070 "Print RPATH information",
583 "Print NEEDED information", 2071 "Print NEEDED information",
584 "Print INTERP information", 2072 "Print INTERP information",
2073 "Print BIND information",
2074 "Print SONAME information",
585 "Find a specified symbol", 2075 "Find a specified symbol",
586 "Print all scanned info (-x -e -t -r)\n", 2076 "Find a specified section",
2077 "Find a specified library",
2078 "Use regex rather than string compare (with -s); specify twice for case insensitive",
2079 "Locate cause of TEXTREL",
2080 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
2081 "Print only ELF files matching numeric bits",
2082 "Print Endianness",
2083 "Print OSABI",
2084 "Print EABI (EM_ARM Only)",
2085 "Print only ELF files matching octal permissions",
2086 "Print ELF file size",
2087 "Print all useful/simple info\n",
587 "Only output 'bad' things", 2088 "Only output 'bad' things",
588 "Be verbose (can be specified more than once)", 2089 "Be verbose (can be specified more than once)",
589 "Use specified format for output", 2090 "Use specified format for output",
2091 "Read input stream from a filename",
590 "Write output stream to a filename", 2092 "Write output stream to a filename",
2093 "Don't emit color in output",
591 "Don't display the header", 2094 "Don't display the header",
592 "Print this help and exit", 2095 "Print this help and exit",
593 "Print version and exit", 2096 "Print version and exit",
594 NULL 2097 NULL
595}; 2098};
596 2099
597/* display usage and exit */ 2100/* display usage and exit */
598static void usage(int status) 2101static void usage(int status)
599{ 2102{
600 unsigned long i; 2103 const char a_arg[] = "<arg>";
2104 size_t a_arg_len = strlen(a_arg) + 2;
2105 size_t i;
2106 int optlen;
601 printf(" Scan ELF binaries for stuff\n\n" 2107 printf("* Scan ELF binaries for stuff\n\n"
602 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0); 2108 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
603 printf("Options: -[%s]\n", PARSE_FLAGS); 2109 printf("Options: -[%s]\n", PARSE_FLAGS);
2110
2111 /* prescan the --long opt length to auto-align */
2112 optlen = 0;
604 for (i = 0; long_opts[i].name; ++i) 2113 for (i = 0; long_opts[i].name; ++i) {
2114 int l = strlen(long_opts[i].name);
2115 if (long_opts[i].has_arg == a_argument)
2116 l += a_arg_len;
2117 optlen = max(l, optlen);
2118 }
2119
2120 for (i = 0; long_opts[i].name; ++i) {
2121 /* first output the short flag if it has one */
2122 if (long_opts[i].val > '~')
2123 printf(" ");
2124 else
2125 printf(" -%c, ", long_opts[i].val);
2126
2127 /* then the long flag */
605 if (long_opts[i].has_arg == no_argument) 2128 if (long_opts[i].has_arg == no_argument)
606 printf(" -%c, --%-13s %s\n", long_opts[i].val, 2129 printf("--%-*s", optlen, long_opts[i].name);
607 long_opts[i].name, opts_help[i]);
608 else 2130 else
609 printf(" -%c, --%-6s <arg> %s\n", long_opts[i].val, 2131 printf("--%s %s %*s", long_opts[i].name, a_arg,
610 long_opts[i].name, opts_help[i]); 2132 (int)(optlen - strlen(long_opts[i].name) - a_arg_len), "");
2133
2134 /* finally the help text */
2135 printf("* %s\n", opts_help[i]);
2136 }
2137
2138 puts("\nFor more information, see the scanelf(1) manpage");
611 exit(status); 2139 exit(status);
612} 2140}
613 2141
614/* parse command line arguments and preform needed actions */ 2142/* parse command line arguments and preform needed actions */
2143#define do_pax_state(option, flag) \
2144 if (islower(option)) { \
2145 flags &= ~PF_##flag; \
2146 flags |= PF_NO##flag; \
2147 } else { \
2148 flags &= ~PF_NO##flag; \
2149 flags |= PF_##flag; \
2150 }
2151static void parse_delimited(array_t *arr, char *arg, const char *delim)
2152{
2153 char *ele = strtok(arg, delim);
2154 if (!ele) /* edge case: -s '' */
2155 xarraypush_str(arr, "");
2156 while (ele) {
2157 xarraypush_str(arr, ele);
2158 ele = strtok(NULL, delim);
2159 }
2160}
615static void parseargs(int argc, char *argv[]) 2161static int parseargs(int argc, char *argv[])
616{ 2162{
617 int flag; 2163 int i;
2164 const char *from_file = NULL;
2165 int ret = 0;
2166 char load_cache_config = 0;
618 2167
619 opterr = 0; 2168 opterr = 0;
620 while ((flag=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 2169 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
621 switch (flag) { 2170 switch (i) {
622 2171
623 case 'V': 2172 case 'V':
624 printf("%s compiled %s\n%s\n" 2173 printf("pax-utils-%s: %s compiled %s\n%s\n"
625 "%s written for Gentoo Linux by <solar and vapier @ gentoo.org>\n", 2174 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
626 __FILE__, __DATE__, rcsid, argv0); 2175 VERSION, __FILE__, __DATE__, rcsid, argv0);
627 exit(EXIT_SUCCESS); 2176 exit(EXIT_SUCCESS);
628 break; 2177 break;
629 case 'h': usage(EXIT_SUCCESS); break; 2178 case 'h': usage(EXIT_SUCCESS); break;
630 2179 case 'f':
2180 if (from_file) warn("You prob don't want to specify -f twice");
2181 from_file = optarg;
2182 break;
2183 case 'E':
2184 /* historically, this was comma delimited */
2185 parse_delimited(match_etypes, optarg, ",");
2186 break;
2187 case 'M':
2188 match_bits = atoi(optarg);
2189 if (match_bits == 0) {
2190 if (strcmp(optarg, "ELFCLASS32") == 0)
2191 match_bits = 32;
2192 if (strcmp(optarg, "ELFCLASS64") == 0)
2193 match_bits = 64;
2194 }
2195 break;
2196 case 'O':
2197 if (sscanf(optarg, "%o", &match_perms) == -1)
2198 match_bits = 0;
2199 break;
631 case 'o': { 2200 case 'o': {
632 FILE *fp = NULL;
633 fp = freopen(optarg, "w", stdout); 2201 if (freopen(optarg, "w", stdout) == NULL)
634 if (fp == NULL) 2202 errp("Could not freopen(%s)", optarg);
635 err("Could not open output stream '%s': %s", optarg, strerror(errno));
636 stdout = fp;
637 break; 2203 break;
638 } 2204 }
639 2205 case 'k':
2206 xarraypush_str(find_section_arr, optarg);
2207 break;
2208 case 's':
2209 /* historically, this was comma delimited */
2210 parse_delimited(find_sym_arr, optarg, ",");
2211 break;
2212 case 'N':
2213 xarraypush_str(find_lib_arr, optarg);
2214 break;
640 case 's': { 2215 case 'F': {
641 size_t len; 2216 if (out_format) warn("You prob don't want to specify -F twice");
642 find_sym = xstrdup(optarg); 2217 out_format = optarg;
643 len = strlen(find_sym) + 1;
644 versioned_symname = (char*)xmalloc(sizeof(char) * (len+1));
645 sprintf(versioned_symname, "%s@", find_sym);
646 break; 2218 break;
647 } 2219 }
648
649 case 'F': { 2220 case 'z': {
650 out_format = strdup(optarg); 2221 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
2222 size_t x;
2223
2224 for (x = 0; x < strlen(optarg); x++) {
2225 switch (optarg[x]) {
2226 case 'p':
2227 case 'P':
2228 do_pax_state(optarg[x], PAGEEXEC);
2229 break;
2230 case 's':
2231 case 'S':
2232 do_pax_state(optarg[x], SEGMEXEC);
2233 break;
2234 case 'm':
2235 case 'M':
2236 do_pax_state(optarg[x], MPROTECT);
2237 break;
2238 case 'e':
2239 case 'E':
2240 do_pax_state(optarg[x], EMUTRAMP);
2241 break;
2242 case 'r':
2243 case 'R':
2244 do_pax_state(optarg[x], RANDMMAP);
2245 break;
2246 case 'x':
2247 case 'X':
2248 do_pax_state(optarg[x], RANDEXEC);
2249 break;
2250 default:
2251 break;
2252 }
2253 }
2254 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
2255 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
2256 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
2257 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
2258 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
2259 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
2260 setpax = flags;
651 break; 2261 break;
652 } 2262 }
653 2263 case 'Z': show_size = 1; break;
2264 case 'g': ++g_match; break;
2265 case 'L': load_cache_config = use_ldcache = 1; break;
654 case 'y': scan_symlink = 0; break; 2266 case 'y': scan_symlink = 0; break;
2267 case 'A': scan_archives = 1; break;
2268 case 'C': color_init(true); break;
655 case 'B': show_banner = 0; break; 2269 case 'B': show_banner = 0; break;
656 case 'l': scan_ldpath = 1; break; 2270 case 'l': load_cache_config = scan_ldpath = 1; break;
657 case 'p': scan_envpath = 1; break; 2271 case 'p': scan_envpath = 1; break;
658 case 'R': dir_recurse = 1; break; 2272 case 'R': dir_recurse = 1; break;
659 case 'm': dir_crossmount = 0; break; 2273 case 'm': dir_crossmount = 0; break;
2274 case 'X': ++fix_elf; break;
660 case 'x': show_pax = 1; break; 2275 case 'x': show_pax = 1; break;
661 case 'e': show_stack = 1; break; 2276 case 'e': show_phdr = 1; break;
662 case 't': show_textrel = 1; break; 2277 case 't': show_textrel = 1; break;
663 case 'r': show_rpath = 1; break; 2278 case 'r': show_rpath = 1; break;
664 case 'n': show_needed = 1; break; 2279 case 'n': show_needed = 1; break;
665 case 'i': show_interp = 1; break; 2280 case 'i': show_interp = 1; break;
666 case 'q': be_quiet = 1; break; 2281 case 'b': show_bind = 1; break;
2282 case 'S': show_soname = 1; break;
2283 case 'T': show_textrels = 1; break;
2284 case 'q': be_quiet = min(be_quiet, 20) + 1; break;
667 case 'v': be_verbose = (be_verbose % 20) + 1; break; 2285 case 'v': be_verbose = min(be_verbose, 20) + 1; break;
668 case 'a': show_pax = show_stack = show_textrel = show_rpath = show_needed = show_interp = 1; break; 2286 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
669 2287 case 'D': show_endian = 1; break;
2288 case 'I': show_osabi = 1; break;
2289 case 'Y': show_eabi = 1; break;
2290 case 128:
2291 root_fd = open(optarg, O_RDONLY|O_CLOEXEC);
2292 if (root_fd == -1)
2293 err("Could not open root: %s", optarg);
2294 break;
2295 case 129: load_cache_config = use_ldpath = 1; break;
670 case ':': 2296 case ':':
671 warn("Option missing parameter\n"); 2297 err("Option '%c' is missing parameter", optopt);
672 usage(EXIT_FAILURE);
673 break;
674 case '?': 2298 case '?':
675 warn("Unknown option\n"); 2299 err("Unknown option '%c' or argument missing", optopt);
676 usage(EXIT_FAILURE);
677 break;
678 default: 2300 default:
679 err("Unhandled option '%c'", flag); 2301 err("Unhandled option '%c'; please report this", i);
680 break;
681 } 2302 }
682 } 2303 }
2304 if (show_textrels && be_verbose)
2305 objdump = which("objdump", "OBJDUMP");
2306 /* precompile all the regexes */
2307 if (g_match) {
2308 regex_t preg;
2309 const char *this_sym;
2310 size_t n;
2311 int flags = REG_EXTENDED | REG_NOSUB | (g_match > 1 ? REG_ICASE : 0);
683 2312
684 if (be_quiet && be_verbose) 2313 array_for_each(find_sym_arr, n, this_sym) {
685 err("You can be quiet or you can be verbose, not both, stupid"); 2314 /* see scanelf_match_symname for logic info */
2315 switch (this_sym[0]) {
2316 case '%':
2317 while (*(this_sym++))
2318 if (*this_sym == '%') {
2319 ++this_sym;
2320 break;
2321 }
2322 break;
2323 case '+':
2324 case '-':
2325 ++this_sym;
2326 break;
2327 }
2328 if (*this_sym == '*')
2329 ++this_sym;
686 2330
2331 ret = regcomp(&preg, this_sym, flags);
2332 if (ret) {
2333 char err[256];
2334 regerror(ret, &preg, err, sizeof(err));
2335 err("regcomp of %s failed: %s", this_sym, err);
2336 }
2337 xarraypush(find_sym_regex_arr, &preg, sizeof(preg));
2338 }
2339 }
2340 /* flatten arrays for display */
2341 find_sym = array_flatten_str(find_sym_arr);
2342 find_lib = array_flatten_str(find_lib_arr);
2343 find_section = array_flatten_str(find_section_arr);
687 /* let the format option override all other options */ 2344 /* let the format option override all other options */
688 if (out_format) { 2345 if (out_format) {
689 show_pax = show_stack = show_textrel = show_rpath = show_needed = show_interp = 0; 2346 show_pax = show_phdr = show_textrel = show_rpath = \
2347 show_needed = show_interp = show_bind = show_soname = \
2348 show_textrels = show_perms = show_endian = show_size = \
2349 show_osabi = show_eabi = 0;
690 for (flag=0; out_format[flag]; ++flag) { 2350 for (i = 0; out_format[i]; ++i) {
691 if (out_format[flag] != '%') continue; 2351 if (!IS_MODIFIER(out_format[i])) continue;
692 2352
693 switch (out_format[++flag]) { 2353 switch (out_format[++i]) {
2354 case '+': break;
694 case '%': break; 2355 case '%': break;
2356 case '#': break;
695 case 'F': break; 2357 case 'F': break;
2358 case 'p': break;
2359 case 'f': break;
2360 case 'k': break;
696 case 's': break; 2361 case 's': break;
2362 case 'N': break;
697 case 'o': break; 2363 case 'o': break;
2364 case 'a': break;
2365 case 'M': break;
2366 case 'Z': show_size = 1; break;
2367 case 'D': show_endian = 1; break;
2368 case 'I': show_osabi = 1; break;
2369 case 'Y': show_eabi = 1; break;
2370 case 'O': show_perms = 1; break;
698 case 'x': show_pax = 1; break; 2371 case 'x': show_pax = 1; break;
699 case 'e': show_stack = 1; break; 2372 case 'e': show_phdr = 1; break;
700 case 't': show_textrel = 1; break; 2373 case 't': show_textrel = 1; break;
701 case 'r': show_rpath = 1; break; 2374 case 'r': show_rpath = 1; break;
702 case 'n': show_needed = 1; break; 2375 case 'n': show_needed = 1; break;
703 case 'i': show_interp = 1; break; 2376 case 'i': show_interp = 1; break;
2377 case 'b': show_bind = 1; break;
2378 case 'S': show_soname = 1; break;
2379 case 'T': show_textrels = 1; break;
704 default: 2380 default:
705 err("Invalid format specifier '%c' (byte %i)", 2381 err("invalid format specifier '%c' (byte %i)",
706 out_format[flag], flag+1); 2382 out_format[i], i+1);
707 } 2383 }
708 } 2384 }
709 2385
710 /* construct our default format */ 2386 /* construct our default format */
711 } else { 2387 } else {
712 size_t fmt_len = 30; 2388 size_t fmt_len = 30;
713 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 2389 out_format = xmalloc(sizeof(char) * fmt_len);
2390 *out_format = '\0';
714 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 2391 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
715 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len); 2392 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
2393 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
2394 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
2395 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
716 if (show_stack) xstrcat(&out_format, "%e ", &fmt_len); 2396 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
2397 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
2398 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
717 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 2399 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
718 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 2400 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
719 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 2401 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
720 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 2402 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
2403 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
2404 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
2405 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
721 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len); 2406 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
2407 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
2408 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
722 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 2409 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
723 } 2410 }
724 if (be_verbose > 2) printf("Format: %s\n", out_format); 2411 if (be_verbose > 2) printf("Format: %s\n", out_format);
725 2412
726 /* now lets actually do the scanning */ 2413 /* now lets actually do the scanning */
2414 if (load_cache_config)
2415 load_ld_cache_config(__PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
727 if (scan_ldpath) scanelf_ldpath(); 2416 if (scan_ldpath) scanelf_ldpath();
728 if (scan_envpath) scanelf_envpath(); 2417 if (scan_envpath) scanelf_envpath();
2418 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
2419 from_file = "-";
2420 if (from_file) {
2421 scanelf_from_file(from_file);
2422 from_file = *argv;
2423 }
729 if (optind == argc && !scan_ldpath && !scan_envpath) 2424 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
730 err("Nothing to scan !?"); 2425 err("Nothing to scan !?");
731 while (optind < argc) 2426 while (optind < argc) {
732 scanelf_dir(argv[optind++]); 2427 search_path = argv[optind++];
2428 ret = scanelf_dir(search_path);
2429 }
733 2430
2431#ifdef __PAX_UTILS_CLEANUP
734 /* clean up */ 2432 /* clean up */
735 if (find_sym) { 2433 xarrayfree(ldpaths);
2434 xarrayfree(find_sym_arr);
2435 xarrayfree(find_lib_arr);
2436 xarrayfree(find_section_arr);
736 free(find_sym); 2437 free(find_sym);
737 free(versioned_symname); 2438 free(find_lib);
2439 free(find_section);
2440 {
2441 size_t n;
2442 regex_t *preg;
2443 array_for_each(find_sym_regex_arr, n, preg)
2444 regfree(preg);
2445 xarrayfree(find_sym_regex_arr);
738 } 2446 }
739 if (out_format) free(out_format);
740}
741 2447
2448 if (ldcache != 0)
2449 munmap(ldcache, ldcache_size);
2450#endif
742 2451
743
744/* utility funcs */
745static char *xstrdup(char *s)
746{
747 char *ret = strdup(s);
748 if (!ret) err("Could not strdup(): %s", strerror(errno));
749 return ret; 2452 return ret;
750} 2453}
751static void *xmalloc(size_t size)
752{
753 void *ret = malloc(size);
754 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
755 return ret;
756}
757static void xstrcat(char **dst, const char *src, size_t *curr_len)
758{
759 long new_len;
760 2454
761 new_len = strlen(*dst) + strlen(src); 2455static char **get_split_env(const char *envvar)
762 if (*curr_len <= new_len) {
763 *curr_len = new_len + (*curr_len / 2);
764 *dst = realloc(*dst, *curr_len);
765 if (!*dst)
766 err("could not realloc %li bytes", (unsigned long)*curr_len);
767 }
768
769 strcat(*dst, src);
770}
771static inline void xchrcat(char **dst, const char append, size_t *curr_len)
772{ 2456{
773 static char my_app[2]; 2457 const char *delims = " \t\n";
774 my_app[0] = append; 2458 char **envvals = NULL;
775 my_app[1] = '\0'; 2459 char *env, *s;
776 xstrcat(dst, my_app, curr_len); 2460 int nentry;
777} 2461
778static int xemptybuffer(const char *buff) 2462 if ((env = getenv(envvar)) == NULL)
779{
780 long i;
781 for (i=0; buff[i]; ++i)
782 if (buff[i] != ' ')
783 return 0; 2463 return NULL;
2464
2465 env = xstrdup(env);
2466 if (env == NULL)
784 return 1; 2467 return NULL;
785}
786 2468
2469 s = strtok(env, delims);
2470 if (s == NULL) {
2471 free(env);
2472 return NULL;
2473 }
787 2474
2475 nentry = 0;
2476 while (s != NULL) {
2477 ++nentry;
2478 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
2479 envvals[nentry-1] = s;
2480 s = strtok(NULL, delims);
2481 }
2482 envvals[nentry] = NULL;
2483
2484 /* don't want to free(env) as it contains the memory that backs
2485 * the envvals array of strings */
2486 return envvals;
2487}
2488
2489static void parseenv(void)
2490{
2491 color_init(false);
2492 qa_textrels = get_split_env("QA_TEXTRELS");
2493 qa_execstack = get_split_env("QA_EXECSTACK");
2494 qa_wx_load = get_split_env("QA_WX_LOAD");
2495}
2496
2497#ifdef __PAX_UTILS_CLEANUP
2498static void cleanup(void)
2499{
2500 free(out_format);
2501 free(qa_textrels);
2502 free(qa_execstack);
2503 free(qa_wx_load);
2504}
2505#endif
788 2506
789int main(int argc, char *argv[]) 2507int main(int argc, char *argv[])
790{ 2508{
2509 int ret;
791 if (argc < 2) 2510 if (argc < 2)
792 usage(EXIT_FAILURE); 2511 usage(EXIT_FAILURE);
2512 parseenv();
793 parseargs(argc, argv); 2513 ret = parseargs(argc, argv);
794 fclose(stdout); 2514 fclose(stdout);
795 return EXIT_SUCCESS; 2515#ifdef __PAX_UTILS_CLEANUP
2516 cleanup();
2517 warn("The calls to add/delete heap should be off:\n"
2518 "\t- 1 due to the out_buffer not being freed in scanelf_fileat()\n"
2519 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
2520#endif
2521 return ret;
796} 2522}
2523
2524/* Match filename against entries in matchlist, return TRUE
2525 * if the file is listed */
2526static int file_matches_list(const char *filename, char **matchlist)
2527{
2528 char **file;
2529 char *match;
2530 char buf[__PAX_UTILS_PATH_MAX];
2531
2532 if (matchlist == NULL)
2533 return 0;
2534
2535 for (file = matchlist; *file != NULL; file++) {
2536 if (search_path) {
2537 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2538 match = buf;
2539 } else {
2540 match = *file;
2541 }
2542 if (fnmatch(match, filename, 0) == 0)
2543 return 1;
2544 }
2545 return 0;
2546}

Legend:
Removed from v.1.44  
changed lines
  Added in v.1.271

  ViewVC Help
Powered by ViewVC 1.1.20