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Revision 1.44 Revision 1.273
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 1.273 2015/02/22 01:38:28 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 1.273 2015/02/22 01:38:28 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 if (!elf->phdr)
233 return;
234#define GET_SYMTABS_DT(B) \
235 if (elf->elf_class == ELFCLASS ## B) { \
236 size_t i; \
237 static Elf ## B ## _Shdr sym_shdr, str_shdr; \
238 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
239 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
240 Elf ## B ## _Addr vsym, vstr, vhash, vgnu_hash; \
241 Elf ## B ## _Dyn *dyn; \
242 Elf ## B ## _Off offset; \
243 \
244 /* lookup symbols used at runtime with DT_SYMTAB / DT_STRTAB */ \
245 vsym = vstr = vhash = vgnu_hash = 0; \
246 memset(&sym_shdr, 0, sizeof(sym_shdr)); \
247 memset(&str_shdr, 0, sizeof(str_shdr)); \
248 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
249 if (EGET(phdr[i].p_type) != PT_DYNAMIC) \
250 continue; \
251 \
252 offset = EGET(phdr[i].p_offset); \
253 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
254 continue; \
255 \
256 dyn = DYN ## B (elf->vdata + offset); \
257 while (EGET(dyn->d_tag) != DT_NULL) { \
258 switch (EGET(dyn->d_tag)) { \
259 case DT_SYMTAB: vsym = EGET(dyn->d_un.d_val); break; \
260 case DT_SYMENT: sym_shdr.sh_entsize = dyn->d_un.d_val; break; \
261 case DT_STRTAB: vstr = EGET(dyn->d_un.d_val); break; \
262 case DT_STRSZ: str_shdr.sh_size = dyn->d_un.d_val; break; \
263 case DT_HASH: vhash = EGET(dyn->d_un.d_val); break; \
264 /*case DT_GNU_HASH: vgnu_hash = EGET(dyn->d_un.d_val); break;*/ \
265 } \
266 ++dyn; \
267 } \
268 if (vsym && vstr) \
269 break; \
270 } \
271 if (!vsym || !vstr || !(vhash || vgnu_hash)) \
272 return; \
273 \
274 /* calc offset into the ELF by finding the load addr of the syms */ \
275 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
276 Elf ## B ## _Addr vaddr = EGET(phdr[i].p_vaddr); \
277 Elf ## B ## _Addr filesz = EGET(phdr[i].p_filesz); \
278 offset = EGET(phdr[i].p_offset); \
279 \
280 if (EGET(phdr[i].p_type) != PT_LOAD) \
281 continue; \
282 \
283 if (vhash >= vaddr && vhash < vaddr + filesz) { \
284 /* Scan the hash table to see how many entries we have */ \
285 Elf32_Word max_sym_idx = 0; \
286 Elf32_Word *hashtbl = elf->vdata + offset + (vhash - vaddr); \
287 Elf32_Word b, nbuckets = EGET(hashtbl[0]); \
288 Elf32_Word nchains = EGET(hashtbl[1]); \
289 Elf32_Word *buckets = &hashtbl[2]; \
290 Elf32_Word *chains = &buckets[nbuckets]; \
291 Elf32_Word sym_idx; \
292 \
293 for (b = 0; b < nbuckets; ++b) { \
294 if (!buckets[b]) \
295 continue; \
296 for (sym_idx = buckets[b]; sym_idx < nchains && sym_idx; sym_idx = chains[sym_idx]) \
297 if (max_sym_idx < sym_idx) \
298 max_sym_idx = sym_idx; \
299 } \
300 ESET(sym_shdr.sh_size, sym_shdr.sh_entsize * max_sym_idx); \
301 } \
302 \
303 if (vsym >= vaddr && vsym < vaddr + filesz) { \
304 ESET(sym_shdr.sh_offset, offset + (vsym - vaddr)); \
305 *sym = &sym_shdr; \
306 } \
307 \
308 if (vstr >= vaddr && vstr < vaddr + filesz) { \
309 ESET(str_shdr.sh_offset, offset + (vstr - vaddr)); \
310 *str = &str_shdr; \
311 } \
312 } \
313 }
314 GET_SYMTABS_DT(32)
315 GET_SYMTABS_DT(64)
316}
317
77static char *scanelf_file_pax(elfobj *elf, char *found_pax) 318static char *scanelf_file_pax(elfobj *elf, char *found_pax)
78{ 319{
79 static char *paxflags; 320 static char ret[7];
321 unsigned long i, shown;
80 322
81 if (!show_pax) return NULL; 323 if (!show_pax) return NULL;
82 324
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; 325 shown = 0;
100 strcpy(ret, "--- ---"); 326 memset(&ret, 0, sizeof(ret));
101 327
102 if (elf->phdr) { 328 if (elf->phdr) {
103#define SHOW_STACK(B) \ 329#define SHOW_PAX(B) \
104 if (elf->elf_class == ELFCLASS ## B) { \ 330 if (elf->elf_class == ELFCLASS ## B) { \
105 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 331 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
106 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 332 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
107 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 333 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
108 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \ 334 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; \ 335 continue; \
116 if (be_quiet && !(EGET(phdr[i].p_flags) & PF_X)) \ 336 if (fix_elf && setpax) { \
337 /* set the paxctl flags */ \
338 ESET(phdr[i].p_flags, setpax); \
339 } \
340 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
117 continue; \ 341 continue; \
118 memcpy(ret+off, gnu_short_stack_flags(EGET(phdr[i].p_flags)), 3); \ 342 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
119 *found = 1; \ 343 *found_pax = 1; \
120 ++shown; \ 344 ++shown; \
345 break; \
121 } \ 346 } \
122 } 347 }
123 SHOW_STACK(32) 348 SHOW_PAX(32)
124 SHOW_STACK(64) 349 SHOW_PAX(64)
350 }
351
352 /* Note: We do not support setting EI_PAX if not PT_PAX_FLAGS
353 * was found. This is known to break ELFs on glibc systems,
354 * and mainline PaX has deprecated use of this for a long time.
355 * We could support changing PT_GNU_STACK, but that doesn't
356 * seem like it's worth the effort. #411919
357 */
358
359 /* fall back to EI_PAX if no PT_PAX was found */
360 if (!*ret) {
361 static char *paxflags;
362 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
363 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
364 *found_pax = 1;
365 return (be_wewy_wewy_quiet ? NULL : paxflags);
125 } 366 }
367 strncpy(ret, paxflags, sizeof(ret));
368 }
126 369
127 if (be_quiet && !shown) 370 if (be_wewy_wewy_quiet || (be_quiet && !shown))
128 return NULL; 371 return NULL;
129 else 372 else
130 return ret; 373 return ret;
131} 374}
375
376static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
377{
378 static char ret[12];
379 char *found;
380 unsigned long i, shown, multi_stack, multi_relro, multi_load;
381
382 if (!show_phdr) return NULL;
383
384 memcpy(ret, "--- --- ---\0", 12);
385
386 shown = 0;
387 multi_stack = multi_relro = multi_load = 0;
388
389#define NOTE_GNU_STACK ".note.GNU-stack"
390#define SHOW_PHDR(B) \
391 if (elf->elf_class == ELFCLASS ## B) { \
392 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
393 Elf ## B ## _Off offset; \
394 uint32_t flags, check_flags; \
395 if (elf->phdr != NULL) { \
396 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
397 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
398 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
399 if (multi_stack++) \
400 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
401 if (file_matches_list(elf->filename, qa_execstack)) \
402 continue; \
403 found = found_phdr; \
404 offset = 0; \
405 check_flags = PF_X; \
406 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
407 if (multi_relro++) \
408 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
409 found = found_relro; \
410 offset = 4; \
411 check_flags = PF_X; \
412 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
413 if (file_matches_list(elf->filename, qa_wx_load)) \
414 continue; \
415 found = found_load; \
416 offset = 8; \
417 check_flags = PF_W|PF_X; \
418 } else \
419 continue; \
420 flags = EGET(phdr[i].p_flags); \
421 if (be_quiet && ((flags & check_flags) != check_flags)) \
422 continue; \
423 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
424 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
425 ret[3] = ret[7] = '!'; \
426 flags = EGET(phdr[i].p_flags); \
427 } \
428 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
429 *found = 1; \
430 ++shown; \
431 } \
432 } else if (elf->shdr != NULL) { \
433 /* no program headers which means this is prob an object file */ \
434 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
435 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
436 if ((void*)strtbl > elf->data_end) \
437 goto skip_this_shdr##B; \
438 /* let's flag -w/+x object files since the final ELF will most likely \
439 * need write access to the stack (who doesn't !?). so the combined \
440 * output will bring in +w automatically and that's bad. \
441 */ \
442 check_flags = /*SHF_WRITE|*/SHF_EXECINSTR; \
443 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
444 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
445 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
446 if (offset >= elf->len - sizeof(NOTE_GNU_STACK)) \
447 continue; \
448 if (!strcmp(elf->data + offset, NOTE_GNU_STACK)) { \
449 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
450 flags = EGET(shdr[i].sh_flags); \
451 if (be_quiet && ((flags & check_flags) != check_flags)) \
452 continue; \
453 ++*found_phdr; \
454 shown = 1; \
455 if (flags & SHF_WRITE) ret[0] = 'W'; \
456 if (flags & SHF_ALLOC) ret[1] = 'A'; \
457 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
458 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
459 break; \
460 } \
461 } \
462 skip_this_shdr##B: \
463 if (!multi_stack) { \
464 if (file_matches_list(elf->filename, qa_execstack)) \
465 return NULL; \
466 *found_phdr = 1; \
467 shown = 1; \
468 memcpy(ret, "!WX", 3); \
469 } \
470 } \
471 }
472 SHOW_PHDR(32)
473 SHOW_PHDR(64)
474
475 if (be_wewy_wewy_quiet || (be_quiet && !shown))
476 return NULL;
477 else
478 return ret;
479}
480
481/*
482 * See if this ELF contains a DT_TEXTREL tag in any of its
483 * PT_DYNAMIC sections.
484 */
132static char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 485static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
133{ 486{
134 static char *ret = "TEXTREL"; 487 static const char *ret = "TEXTREL";
135 unsigned long i; 488 unsigned long i;
136 489
137 if (!show_textrel) return NULL; 490 if (!show_textrel && !show_textrels) return NULL;
491
492 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
138 493
139 if (elf->phdr) { 494 if (elf->phdr) {
140#define SHOW_TEXTREL(B) \ 495#define SHOW_TEXTREL(B) \
141 if (elf->elf_class == ELFCLASS ## B) { \ 496 if (elf->elf_class == ELFCLASS ## B) { \
142 Elf ## B ## _Dyn *dyn; \ 497 Elf ## B ## _Dyn *dyn; \
143 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 498 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
144 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 499 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
145 Elf ## B ## _Off offset; \ 500 Elf ## B ## _Off offset; \
146 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 501 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
147 if (phdr[i].p_type != PT_DYNAMIC) continue; \ 502 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
148 offset = EGET(phdr[i].p_offset); \ 503 offset = EGET(phdr[i].p_offset); \
149 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 504 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
150 dyn = DYN ## B (elf->data + offset); \ 505 dyn = DYN ## B (elf->vdata + offset); \
151 while (EGET(dyn->d_tag) != DT_NULL) { \ 506 while (EGET(dyn->d_tag) != DT_NULL) { \
152 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \ 507 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
153 *found_textrel = 1; \ 508 *found_textrel = 1; \
154 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \ 509 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
155 return ret; \ 510 return (be_wewy_wewy_quiet ? NULL : ret); \
156 } \ 511 } \
157 ++dyn; \ 512 ++dyn; \
158 } \ 513 } \
159 } } 514 } }
160 SHOW_TEXTREL(32) 515 SHOW_TEXTREL(32)
161 SHOW_TEXTREL(64) 516 SHOW_TEXTREL(64)
162 } 517 }
163 518
164 if (be_quiet) 519 if (be_quiet || be_wewy_wewy_quiet)
165 return NULL; 520 return NULL;
166 else 521 else
167 return " - "; 522 return " - ";
168} 523}
524
525/*
526 * Scan the .text section to see if there are any relocations in it.
527 * Should rewrite this to check PT_LOAD sections that are marked
528 * Executable rather than the section named '.text'.
529 */
530static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
531{
532 unsigned long s, r, rmax;
533 void *symtab_void, *strtab_void, *text_void;
534
535 if (!show_textrels) return NULL;
536
537 /* don't search for TEXTREL's if the ELF doesn't have any */
538 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
539 if (!*found_textrel) return NULL;
540
541 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
542 text_void = elf_findsecbyname(elf, ".text");
543
544 if (symtab_void && strtab_void && text_void && elf->shdr) {
545#define SHOW_TEXTRELS(B) \
546 if (elf->elf_class == ELFCLASS ## B) { \
547 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
548 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
549 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
550 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
551 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
552 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
553 uint ## B ## _t memsz = EGET(text->sh_size); \
554 Elf ## B ## _Rel *rel; \
555 Elf ## B ## _Rela *rela; \
556 /* search the section headers for relocations */ \
557 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
558 uint32_t sh_type = EGET(shdr[s].sh_type); \
559 if (sh_type == SHT_REL) { \
560 rel = REL ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
561 rela = NULL; \
562 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
563 } else if (sh_type == SHT_RELA) { \
564 rel = NULL; \
565 rela = RELA ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
566 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
567 } else \
568 continue; \
569 /* now see if any of the relocs are in the .text */ \
570 for (r = 0; r < rmax; ++r) { \
571 unsigned long sym_max; \
572 Elf ## B ## _Addr offset_tmp; \
573 Elf ## B ## _Sym *func; \
574 Elf ## B ## _Sym *sym; \
575 Elf ## B ## _Addr r_offset; \
576 uint ## B ## _t r_info; \
577 if (sh_type == SHT_REL) { \
578 r_offset = EGET(rel[r].r_offset); \
579 r_info = EGET(rel[r].r_info); \
580 } else { \
581 r_offset = EGET(rela[r].r_offset); \
582 r_info = EGET(rela[r].r_info); \
583 } \
584 /* make sure this relocation is inside of the .text */ \
585 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
586 if (be_verbose <= 2) continue; \
587 } else \
588 *found_textrels = 1; \
589 /* locate this relocation symbol name */ \
590 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
591 if ((void*)sym > elf->data_end) { \
592 warn("%s: corrupt ELF symbol", elf->filename); \
593 continue; \
594 } \
595 sym_max = ELF ## B ## _R_SYM(r_info); \
596 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
597 sym += sym_max; \
598 else \
599 sym = NULL; \
600 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
601 /* show the raw details about this reloc */ \
602 printf(" %s: ", elf->base_filename); \
603 if (sym && sym->st_name) \
604 printf("%s", elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
605 else \
606 printf("(memory/data?)"); \
607 printf(" [0x%lX]", (unsigned long)r_offset); \
608 /* now try to find the closest symbol that this rel is probably in */ \
609 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
610 func = NULL; \
611 offset_tmp = 0; \
612 while (sym_max--) { \
613 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
614 func = sym; \
615 offset_tmp = EGET(sym->st_value); \
616 } \
617 ++sym; \
618 } \
619 printf(" in "); \
620 if (func && func->st_name) { \
621 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
622 if (r_offset > EGET(func->st_size)) \
623 printf("(optimized out: previous %s)", func_name); \
624 else \
625 printf("%s", func_name); \
626 } else \
627 printf("(optimized out)"); \
628 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
629 if (be_verbose && objdump) { \
630 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
631 char *sysbuf; \
632 size_t syslen; \
633 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"; \
634 syslen = sizeof(sysfmt) + strlen(objdump) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
635 sysbuf = xmalloc(syslen); \
636 if (end_addr < r_offset) \
637 /* not uncommon when things are optimized out */ \
638 end_addr = r_offset + 0x100; \
639 snprintf(sysbuf, syslen, sysfmt, \
640 objdump, \
641 (unsigned long)offset_tmp, \
642 (unsigned long)end_addr, \
643 elf->filename, \
644 (unsigned long)r_offset); \
645 fflush(stdout); \
646 if (system(sysbuf)) {/* don't care */} \
647 fflush(stdout); \
648 free(sysbuf); \
649 } \
650 } \
651 } }
652 SHOW_TEXTRELS(32)
653 SHOW_TEXTRELS(64)
654 }
655 if (!*found_textrels)
656 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
657
658 return NULL;
659}
660
661static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
662{
663 struct stat st;
664 switch (*item) {
665 case '/': break;
666 case '.':
667 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
668 break;
669 case ':':
670 case '\0':
671 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
672 break;
673 case '$':
674 if (fstat(elf->fd, &st) != -1)
675 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
676 warnf("Security problem with %s='%s' in %s with mode set of %o",
677 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
678 break;
679 default:
680 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
681 break;
682 }
683 if (fix_elf)
684 warnf("Note: RPATH has been automatically fixed, but this should be fixed in the package itself");
685}
169static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len) 686static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
170{ 687{
171 /* TODO: if be_quiet, only output RPATH's which aren't in /etc/ld.so.conf */
172 unsigned long i; 688 unsigned long i;
173 char *rpath, *runpath; 689 char *rpath, *runpath, **r;
174 void *strtbl_void; 690 void *strtbl_void;
175 691
176 if (!show_rpath) return; 692 if (!show_rpath) return;
177 693
178 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 694 strtbl_void = elf_findsecbyname(elf, ".dynstr");
184 Elf ## B ## _Dyn *dyn; \ 700 Elf ## B ## _Dyn *dyn; \
185 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 701 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
186 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 702 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
187 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 703 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
188 Elf ## B ## _Off offset; \ 704 Elf ## B ## _Off offset; \
705 Elf ## B ## _Xword word; \
706 /* Scan all the program headers */ \
189 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 707 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
708 /* Just scan dynamic headers */ \
190 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 709 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
191 offset = EGET(phdr[i].p_offset); \ 710 offset = EGET(phdr[i].p_offset); \
192 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 711 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
712 /* Just scan dynamic RPATH/RUNPATH headers */ \
193 dyn = DYN ## B (elf->data + offset); \ 713 dyn = DYN ## B (elf->vdata + offset); \
194 while (EGET(dyn->d_tag) != DT_NULL) { \ 714 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
195 if (EGET(dyn->d_tag) == DT_RPATH) { \ 715 if (word == DT_RPATH) { \
196 if (rpath) warn("ELF has multiple DT_RPATH's !?"); \ 716 r = &rpath; \
717 } else if (word == DT_RUNPATH) { \
718 r = &runpath; \
719 } else { \
720 ++dyn; \
721 continue; \
722 } \
723 /* Verify the memory is somewhat sane */ \
197 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 724 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
198 if (offset >= elf->len) continue; \ 725 if (offset < (Elf ## B ## _Off)elf->len) { \
726 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
199 rpath = (char*)(elf->data + offset); \ 727 *r = elf->data + offset; \
728 /* cache the length in case we need to nuke this section later on */ \
729 if (fix_elf) \
730 offset = strlen(*r); \
731 /* If quiet, don't output paths in ld.so.conf */ \
732 if (be_quiet) { \
733 size_t len; \
734 char *start, *end; \
735 /* note that we only 'chop' off leading known paths. */ \
736 /* since *r is read-only memory, we can only move the ptr forward. */ \
737 start = *r; \
738 /* scan each path in : delimited list */ \
739 while (start) { \
740 rpath_security_checks(elf, start, get_elfdtype(word)); \
741 end = strchr(start, ':'); \
742 len = (end ? abs(end - start) : strlen(start)); \
743 if (use_ldcache) { \
744 size_t n; \
745 const char *ldpath; \
746 array_for_each(ldpaths, n, ldpath) \
747 if (!strncmp(ldpath, start, len) && !ldpath[len]) { \
748 *r = end; \
749 /* corner case ... if RPATH reads "/usr/lib:", we want \
750 * to show ':' rather than '' */ \
751 if (end && end[1] != '\0') \
752 (*r)++; \
753 break; \
754 } \
755 } \
756 if (!*r || !end) \
757 break; \
758 else \
759 start = start + len + 1; \
760 } \
761 } \
762 if (*r) { \
763 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
764 /* just nuke it */ \
765 nuke_it##B: \
766 memset(*r, 0x00, offset); \
767 *r = NULL; \
768 ESET(dyn->d_tag, DT_DEBUG); \
769 ESET(dyn->d_un.d_ptr, 0); \
770 } else if (fix_elf) { \
771 /* try to clean "bad" paths */ \
772 size_t len, tmpdir_len; \
773 char *start, *end; \
774 const char *tmpdir; \
775 start = *r; \
776 tmpdir = (getenv("TMPDIR") ? : "."); \
777 tmpdir_len = strlen(tmpdir); \
778 while (1) { \
779 end = strchr(start, ':'); \
780 if (start == end) { \
781 eat_this_path##B: \
782 len = strlen(end); \
783 memmove(start, end+1, len); \
784 start[len-1] = '\0'; \
785 end = start - 1; \
786 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
787 if (!end) { \
788 if (start == *r) \
789 goto nuke_it##B; \
790 *--start = '\0'; \
791 } else \
792 goto eat_this_path##B; \
793 } \
794 if (!end) \
795 break; \
796 start = end + 1; \
797 } \
798 if (**r == '\0') \
799 goto nuke_it##B; \
800 } \
801 if (*r) \
200 *found_rpath = 1; \ 802 *found_rpath = 1; \
201 } else if (EGET(dyn->d_tag) == DT_RUNPATH) { \ 803 } \
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 } \ 804 } \
208 ++dyn; \ 805 ++dyn; \
209 } \ 806 } \
210 } } 807 } }
211 SHOW_RPATH(32) 808 SHOW_RPATH(32)
212 SHOW_RPATH(64) 809 SHOW_RPATH(64)
213 } 810 }
811
812 if (be_wewy_wewy_quiet) return;
214 813
215 if (rpath && runpath) { 814 if (rpath && runpath) {
216 if (!strcmp(rpath, runpath)) { 815 if (!strcmp(rpath, runpath)) {
217 xstrcat(ret, runpath, ret_len); 816 xstrcat(ret, runpath, ret_len);
218 } else { 817 } else {
226 } else if (rpath || runpath) 825 } else if (rpath || runpath)
227 xstrcat(ret, (runpath ? runpath : rpath), ret_len); 826 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
228 else if (!be_quiet) 827 else if (!be_quiet)
229 xstrcat(ret, " - ", ret_len); 828 xstrcat(ret, " - ", ret_len);
230} 829}
830
831/* Defines can be seen in glibc's sysdeps/generic/ldconfig.h */
832#define LDSO_CACHE_MAGIC "ld.so-"
833#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
834#define LDSO_CACHE_VER "1.7.0"
835#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
836#define FLAG_ANY -1
837#define FLAG_TYPE_MASK 0x00ff
838#define FLAG_LIBC4 0x0000
839#define FLAG_ELF 0x0001
840#define FLAG_ELF_LIBC5 0x0002
841#define FLAG_ELF_LIBC6 0x0003
842#define FLAG_REQUIRED_MASK 0xff00
843#define FLAG_SPARC_LIB64 0x0100
844#define FLAG_IA64_LIB64 0x0200
845#define FLAG_X8664_LIB64 0x0300
846#define FLAG_S390_LIB64 0x0400
847#define FLAG_POWERPC_LIB64 0x0500
848#define FLAG_MIPS64_LIBN32 0x0600
849#define FLAG_MIPS64_LIBN64 0x0700
850#define FLAG_X8664_LIBX32 0x0800
851#define FLAG_ARM_LIBHF 0x0900
852#define FLAG_AARCH64_LIB64 0x0a00
853
854#if defined(__GLIBC__) || defined(__UCLIBC__)
855
856static char *lookup_cache_lib(elfobj *elf, const char *fname)
857{
858 int fd;
859 char *strs;
860 static char buf[__PAX_UTILS_PATH_MAX] = "";
861 const char *cachefile = root_rel_path("/etc/ld.so.cache");
862 struct stat st;
863
864 typedef struct {
865 char magic[LDSO_CACHE_MAGIC_LEN];
866 char version[LDSO_CACHE_VER_LEN];
867 int nlibs;
868 } header_t;
869 header_t *header;
870
871 typedef struct {
872 int flags;
873 int sooffset;
874 int liboffset;
875 } libentry_t;
876 libentry_t *libent;
877
878 if (fname == NULL)
879 return NULL;
880
881 if (ldcache == NULL) {
882 if (fstatat(root_fd, cachefile, &st, 0))
883 return NULL;
884
885 fd = openat(root_fd, cachefile, O_RDONLY);
886 if (fd == -1)
887 return NULL;
888
889 /* cache these values so we only map/unmap the cache file once */
890 ldcache_size = st.st_size;
891 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
892 close(fd);
893
894 if (ldcache == MAP_FAILED) {
895 ldcache = NULL;
896 return NULL;
897 }
898
899 if (memcmp(header->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN) ||
900 memcmp(header->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
901 {
902 munmap(ldcache, ldcache_size);
903 ldcache = NULL;
904 return NULL;
905 }
906 } else
907 header = ldcache;
908
909 libent = ldcache + sizeof(header_t);
910 strs = (char *) &libent[header->nlibs];
911
912 for (fd = 0; fd < header->nlibs; ++fd) {
913 /* This should be more fine grained, but for now we assume that
914 * diff arches will not be cached together, and we ignore the
915 * the different multilib mips cases.
916 */
917 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
918 continue;
919 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
920 continue;
921
922 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
923 continue;
924
925 /* Return first hit because that is how the ldso rolls */
926 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
927 break;
928 }
929
930 return buf;
931}
932
933#elif defined(__NetBSD__)
934static char *lookup_cache_lib(elfobj *elf, const char *fname)
935{
936 static char buf[__PAX_UTILS_PATH_MAX] = "";
937 static struct stat st;
938 size_t n;
939 char *ldpath;
940
941 array_for_each(ldpath, n, ldpath) {
942 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", ldpath, fname) >= sizeof(buf))
943 continue; /* if the pathname is too long, or something went wrong, ignore */
944
945 if (stat(buf, &st) != 0)
946 continue; /* if the lib doesn't exist in *ldpath, look further */
947
948 /* NetBSD doesn't actually do sanity checks, it just loads the file
949 * and if that doesn't work, continues looking in other directories.
950 * This cannot easily be safely emulated, unfortunately. For now,
951 * just assume that if it exists, it's a valid library. */
952
953 return buf;
954 }
955
956 /* not found in any path */
957 return NULL;
958}
959#else
960#ifdef __ELF__
961#warning Cache support not implemented for your target
962#endif
963static char *lookup_cache_lib(elfobj *elf, const char *fname)
964{
965 return NULL;
966}
967#endif
968
969static char *lookup_config_lib(const char *fname)
970{
971 static char buf[__PAX_UTILS_PATH_MAX] = "";
972 const char *ldpath;
973 size_t n;
974
975 array_for_each(ldpaths, n, ldpath) {
976 snprintf(buf, sizeof(buf), "%s/%s", root_rel_path(ldpath), fname);
977 if (faccessat(root_fd, buf, F_OK, AT_SYMLINK_NOFOLLOW) == 0)
978 return buf;
979 }
980
981 return NULL;
982}
983
231static void scanelf_file_needed(elfobj *elf, char *found_needed, char **ret, size_t *ret_len) 984static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
232{ 985{
233 unsigned long i; 986 unsigned long i;
234 char *needed; 987 char *needed;
235 void *strtbl_void; 988 void *strtbl_void;
989 char *p;
236 990
237 if (!show_needed) return; 991 /*
992 * -n -> op==0 -> print all
993 * -N -> op==1 -> print requested
994 */
995 if ((op == 0 && !show_needed) || (op == 1 && !find_lib))
996 return NULL;
238 997
239 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 998 strtbl_void = elf_findsecbyname(elf, ".dynstr");
240 999
241 if (elf->phdr && strtbl_void) { 1000 if (elf->phdr && strtbl_void) {
242#define SHOW_NEEDED(B) \ 1001#define SHOW_NEEDED(B) \
244 Elf ## B ## _Dyn *dyn; \ 1003 Elf ## B ## _Dyn *dyn; \
245 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 1004 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
246 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 1005 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
247 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 1006 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
248 Elf ## B ## _Off offset; \ 1007 Elf ## B ## _Off offset; \
1008 size_t matched = 0; \
1009 /* Walk all the program headers to find the PT_DYNAMIC */ \
249 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 1010 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
250 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 1011 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) \
1012 continue; \
251 offset = EGET(phdr[i].p_offset); \ 1013 offset = EGET(phdr[i].p_offset); \
252 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 1014 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
1015 continue; \
1016 /* Walk all the dynamic tags to find NEEDED entries */ \
253 dyn = DYN ## B (elf->data + offset); \ 1017 dyn = DYN ## B (elf->vdata + offset); \
254 while (EGET(dyn->d_tag) != DT_NULL) { \ 1018 while (EGET(dyn->d_tag) != DT_NULL) { \
255 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 1019 if (EGET(dyn->d_tag) == DT_NEEDED) { \
256 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 1020 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
257 if (offset >= elf->len) continue; \ 1021 if (offset >= (Elf ## B ## _Off)elf->len) { \
1022 ++dyn; \
1023 continue; \
1024 } \
258 needed = (char*)(elf->data + offset); \ 1025 needed = elf->data + offset; \
1026 if (op == 0) { \
1027 /* -n -> print all entries */ \
1028 if (!be_wewy_wewy_quiet) { \
259 if (*found_needed) xchrcat(ret, ',', ret_len); \ 1029 if (*found_needed) xchrcat(ret, ',', ret_len); \
1030 if (use_ldpath) { \
1031 if ((p = lookup_config_lib(needed)) != NULL) \
1032 needed = p; \
1033 } else if (use_ldcache) { \
1034 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
1035 needed = p; \
1036 } \
260 xstrcat(ret, needed, ret_len); \ 1037 xstrcat(ret, needed, ret_len); \
1038 } \
261 *found_needed = 1; \ 1039 *found_needed = 1; \
1040 } else { \
1041 /* -N -> print matching entries */ \
1042 size_t n; \
1043 const char *find_lib_name; \
1044 \
1045 array_for_each(find_lib_arr, n, find_lib_name) { \
1046 int invert = 1; \
1047 if (find_lib_name[0] == '!') \
1048 invert = 0, ++find_lib_name; \
1049 if (!strcmp(find_lib_name, needed) == invert) \
1050 ++matched; \
1051 } \
1052 \
1053 if (matched == array_cnt(find_lib_arr)) { \
1054 *found_lib = 1; \
1055 return (be_wewy_wewy_quiet ? NULL : find_lib); \
1056 } \
1057 } \
262 } \ 1058 } \
263 ++dyn; \ 1059 ++dyn; \
264 } \ 1060 } \
265 } } 1061 } }
266 SHOW_NEEDED(32) 1062 SHOW_NEEDED(32)
267 SHOW_NEEDED(64) 1063 SHOW_NEEDED(64)
1064 if (op == 0 && !*found_needed && be_verbose)
1065 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
268 } 1066 }
1067
1068 return NULL;
269} 1069}
270static char *scanelf_file_interp(elfobj *elf, char *found_interp) 1070static char *scanelf_file_interp(elfobj *elf, char *found_interp)
271{ 1071{
272 void *strtbl_void; 1072 void *strtbl_void;
273 1073
278 if (strtbl_void) { 1078 if (strtbl_void) {
279#define SHOW_INTERP(B) \ 1079#define SHOW_INTERP(B) \
280 if (elf->elf_class == ELFCLASS ## B) { \ 1080 if (elf->elf_class == ELFCLASS ## B) { \
281 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 1081 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
282 *found_interp = 1; \ 1082 *found_interp = 1; \
283 return elf->data + EGET(strtbl->sh_offset); \ 1083 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
284 } 1084 }
285 SHOW_INTERP(32) 1085 SHOW_INTERP(32)
286 SHOW_INTERP(64) 1086 SHOW_INTERP(64)
1087 } else if (elf->phdr) {
1088 /* Walk all the program headers to find the PT_INTERP */
1089#define SHOW_PT_INTERP(B) \
1090 if (elf->elf_class == ELFCLASS ## B) { \
1091 unsigned long i; \
1092 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1093 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1094 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1095 if (EGET(phdr[i].p_type) != PT_INTERP) \
1096 continue; \
1097 *found_interp = 1; \
1098 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(phdr[i].p_offset)); \
1099 } \
287 } 1100 }
1101 SHOW_PT_INTERP(32)
1102 SHOW_PT_INTERP(64)
1103 }
1104
288 return NULL; 1105 return NULL;
289} 1106}
290static char *scanelf_file_sym(elfobj *elf, char *found_sym, const char *filename) 1107static const char *scanelf_file_bind(elfobj *elf, char *found_bind)
291{ 1108{
292 unsigned long i; 1109 unsigned long i;
1110 struct stat s;
1111 bool dynamic = false;
1112
1113 if (!show_bind) return NULL;
1114 if (!elf->phdr) return NULL;
1115
1116#define SHOW_BIND(B) \
1117 if (elf->elf_class == ELFCLASS ## B) { \
1118 Elf ## B ## _Dyn *dyn; \
1119 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1120 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1121 Elf ## B ## _Off offset; \
1122 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1123 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1124 dynamic = true; \
1125 offset = EGET(phdr[i].p_offset); \
1126 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
1127 dyn = DYN ## B (elf->vdata + offset); \
1128 while (EGET(dyn->d_tag) != DT_NULL) { \
1129 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
1130 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
1131 { \
1132 if (be_quiet) return NULL; \
1133 *found_bind = 1; \
1134 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
1135 } \
1136 ++dyn; \
1137 } \
1138 } \
1139 }
1140 SHOW_BIND(32)
1141 SHOW_BIND(64)
1142
1143 if (be_wewy_wewy_quiet) return NULL;
1144
1145 /* don't output anything if quiet mode and the ELF is static or not setuid */
1146 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
1147 return NULL;
1148 } else {
1149 *found_bind = 1;
1150 return dynamic ? "LAZY" : "STATIC";
1151 }
1152}
1153static char *scanelf_file_soname(elfobj *elf, char *found_soname)
1154{
1155 unsigned long i;
1156 char *soname;
1157 void *strtbl_void;
1158
1159 if (!show_soname) return NULL;
1160
1161 strtbl_void = elf_findsecbyname(elf, ".dynstr");
1162
1163 if (elf->phdr && strtbl_void) {
1164#define SHOW_SONAME(B) \
1165 if (elf->elf_class == ELFCLASS ## B) { \
1166 Elf ## B ## _Dyn *dyn; \
1167 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1168 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1169 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
1170 Elf ## B ## _Off offset; \
1171 /* only look for soname in shared objects */ \
1172 if (EGET(ehdr->e_type) != ET_DYN) \
1173 return NULL; \
1174 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1175 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1176 offset = EGET(phdr[i].p_offset); \
1177 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
1178 dyn = DYN ## B (elf->vdata + offset); \
1179 while (EGET(dyn->d_tag) != DT_NULL) { \
1180 if (EGET(dyn->d_tag) == DT_SONAME) { \
1181 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
1182 if (offset >= (Elf ## B ## _Off)elf->len) { \
1183 ++dyn; \
1184 continue; \
1185 } \
1186 soname = elf->data + offset; \
1187 *found_soname = 1; \
1188 return (be_wewy_wewy_quiet ? NULL : soname); \
1189 } \
1190 ++dyn; \
1191 } \
1192 } }
1193 SHOW_SONAME(32)
1194 SHOW_SONAME(64)
1195 }
1196
1197 return NULL;
1198}
1199
1200/*
1201 * We support the symbol form:
1202 * [%[modifiers]%][[+-]<symbol name>][,[.....]]
1203 * If the symbol name is empty, then all symbols are matched.
1204 * If the symbol name is a glob ("*"), then all symbols are dumped (debug).
1205 * Do not rely on this output format at all.
1206 * Otherwise the symbol name is used to search (either regex or string compare).
1207 * If the first char of the symbol name is a plus ("+"), then only match
1208 * defined symbols. If it's a minus ("-"), only match undefined symbols.
1209 * Putting modifiers in between the percent signs allows for more in depth
1210 * filters. There are groups of modifiers. If you don't specify a member
1211 * of a group, then all types in that group are matched. The current
1212 * groups and their types are:
1213 * STT group: STT_NOTYPE:n STT_OBJECT:o STT_FUNC:f STT_FILE:F
1214 * STB group: STB_LOCAL:l STB_GLOBAL:g STB_WEAK:w
1215 * STV group: STV_DEFAULT:p STV_INTERNAL:i STV_HIDDEN:h STV_PROTECTED:P
1216 * SHN group: SHN_UNDEF:u SHN_ABS:a SHN_COMMON:c {defined}:d
1217 * The "defined" value in the SHN group does not correspond to a SHN_xxx define.
1218 * You can search for multiple symbols at once by seperating with a comma (",").
1219 *
1220 * Some examples:
1221 * ELFs with a weak function "foo":
1222 * scanelf -s %wf%foo <ELFs>
1223 * ELFs that define the symbol "main":
1224 * scanelf -s +main <ELFs>
1225 * scanelf -s %d%main <ELFs>
1226 * ELFs that refer to the undefined symbol "brk":
1227 * scanelf -s -brk <ELFs>
1228 * scanelf -s %u%brk <ELFs>
1229 * All global defined objects in an ELF:
1230 * scanelf -s %ogd% <ELF>
1231 */
1232static void
1233scanelf_match_symname(elfobj *elf, char *found_sym, char **ret, size_t *ret_len, const char *symname,
1234 unsigned int stt, unsigned int stb, unsigned int stv, unsigned int shn, unsigned long size)
1235{
1236 const char *this_sym;
1237 size_t n;
1238
1239 array_for_each(find_sym_arr, n, this_sym) {
1240 bool inc_notype, inc_object, inc_func, inc_file,
1241 inc_local, inc_global, inc_weak,
1242 inc_visdef, inc_intern, inc_hidden, inc_prot,
1243 inc_def, inc_undef, inc_abs, inc_common;
1244
1245 /* symbol selection! */
1246 inc_notype = inc_object = inc_func = inc_file =
1247 inc_local = inc_global = inc_weak =
1248 inc_visdef = inc_intern = inc_hidden = inc_prot =
1249 inc_def = inc_undef = inc_abs = inc_common =
1250 (*this_sym != '%');
1251
1252 /* parse the contents of %...% */
1253 if (!inc_notype) {
1254 while (*(this_sym++)) {
1255 if (*this_sym == '%') {
1256 ++this_sym;
1257 break;
1258 }
1259 switch (*this_sym) {
1260 case 'n': inc_notype = true; break;
1261 case 'o': inc_object = true; break;
1262 case 'f': inc_func = true; break;
1263 case 'F': inc_file = true; break;
1264 case 'l': inc_local = true; break;
1265 case 'g': inc_global = true; break;
1266 case 'w': inc_weak = true; break;
1267 case 'p': inc_visdef = true; break;
1268 case 'i': inc_intern = true; break;
1269 case 'h': inc_hidden = true; break;
1270 case 'P': inc_prot = true; break;
1271 case 'd': inc_def = true; break;
1272 case 'u': inc_undef = true; break;
1273 case 'a': inc_abs = true; break;
1274 case 'c': inc_common = true; break;
1275 default: err("invalid symbol selector '%c'", *this_sym);
1276 }
1277 }
1278
1279 /* If no types are matched, not match all */
1280 if (!inc_notype && !inc_object && !inc_func && !inc_file)
1281 inc_notype = inc_object = inc_func = inc_file = true;
1282 if (!inc_local && !inc_global && !inc_weak)
1283 inc_local = inc_global = inc_weak = true;
1284 if (!inc_visdef && !inc_intern && !inc_hidden && !inc_prot)
1285 inc_visdef = inc_intern = inc_hidden = inc_prot = true;
1286 if (!inc_def && !inc_undef && !inc_abs && !inc_common)
1287 inc_def = inc_undef = inc_abs = inc_common = true;
1288
1289 /* backwards compat for defined/undefined short hand */
1290 } else if (*this_sym == '+') {
1291 inc_undef = false;
1292 ++this_sym;
1293 } else if (*this_sym == '-') {
1294 inc_def = inc_abs = inc_common = false;
1295 ++this_sym;
1296 }
1297
1298 /* filter symbols */
1299 if ((!inc_notype && stt == STT_NOTYPE ) || \
1300 (!inc_object && stt == STT_OBJECT ) || \
1301 (!inc_func && stt == STT_FUNC ) || \
1302 (!inc_file && stt == STT_FILE ) || \
1303 (!inc_local && stb == STB_LOCAL ) || \
1304 (!inc_global && stb == STB_GLOBAL ) || \
1305 (!inc_weak && stb == STB_WEAK ) || \
1306 (!inc_visdef && stv == STV_DEFAULT ) || \
1307 (!inc_intern && stv == STV_INTERNAL ) || \
1308 (!inc_hidden && stv == STV_HIDDEN ) || \
1309 (!inc_prot && stv == STV_PROTECTED) || \
1310 (!inc_def && shn && shn < SHN_LORESERVE) || \
1311 (!inc_undef && shn == SHN_UNDEF ) || \
1312 (!inc_abs && shn == SHN_ABS ) || \
1313 (!inc_common && shn == SHN_COMMON ))
1314 continue;
1315
1316 if (*this_sym == '*') {
1317 /* a "*" symbol gets you debug output */
1318 printf("%s(%s) %5lX %-15s %-15s %-15s %-15s %s\n",
1319 ((*found_sym == 0) ? "\n\t" : "\t"),
1320 elf->base_filename,
1321 size,
1322 get_elfstttype(stt),
1323 get_elfstbtype(stb),
1324 get_elfstvtype(stv),
1325 get_elfshntype(shn),
1326 symname);
1327 goto matched;
1328
1329 } else {
1330 if (g_match) {
1331 /* regex match the symbol */
1332 if (regexec(find_sym_regex_arr->eles[n], symname, 0, NULL, 0) == REG_NOMATCH)
1333 continue;
1334
1335 } else if (*this_sym) {
1336 /* give empty symbols a "pass", else do a normal compare */
1337 const size_t len = strlen(this_sym);
1338 if (!(strncmp(this_sym, symname, len) == 0 &&
1339 /* Accept unversioned symbol names */
1340 (symname[len] == '\0' || symname[len] == '@')))
1341 continue;
1342 }
1343
1344 if (be_semi_verbose) {
1345 char buf[1024];
1346 snprintf(buf, sizeof(buf), "%lX %s %s",
1347 size,
1348 get_elfstttype(stt),
1349 this_sym);
1350 *ret = xstrdup(buf);
1351 } else {
1352 if (*ret) xchrcat(ret, ',', ret_len);
1353 xstrcat(ret, symname, ret_len);
1354 }
1355
1356 goto matched;
1357 }
1358 }
1359
1360 return;
1361
1362 matched:
1363 *found_sym = 1;
1364}
1365
1366static const char *scanelf_file_sym(elfobj *elf, char *found_sym)
1367{
1368 char *ret;
293 void *symtab_void, *strtab_void; 1369 void *symtab_void, *strtab_void;
294 1370
295 if (!find_sym) return NULL; 1371 if (!find_sym) return NULL;
1372 ret = NULL;
296 1373
297 symtab_void = elf_findsecbyname(elf, ".symtab"); 1374 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
298 strtab_void = elf_findsecbyname(elf, ".strtab");
299 1375
300 if (symtab_void && strtab_void) { 1376 if (symtab_void && strtab_void) {
301#define FIND_SYM(B) \ 1377#define FIND_SYM(B) \
302 if (elf->elf_class == ELFCLASS ## B) { \ 1378 if (elf->elf_class == ELFCLASS ## B) { \
303 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 1379 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
304 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 1380 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
305 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 1381 Elf ## B ## _Sym *sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
306 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 1382 Elf ## B ## _Word i, cnt = EGET(symtab->sh_entsize); \
307 char *symname; \ 1383 char *symname; \
1384 size_t ret_len = 0; \
1385 if (cnt) \
1386 cnt = EGET(symtab->sh_size) / cnt; \
308 for (i = 0; i < cnt; ++i) { \ 1387 for (i = 0; i < cnt; ++i) { \
1388 if ((void*)sym > elf->data_end) { \
1389 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1390 goto break_out; \
1391 } \
309 if (sym->st_name) { \ 1392 if (sym->st_name) { \
1393 /* make sure the symbol name is in acceptable memory range */ \
310 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 1394 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
311 if (*find_sym == '*') { \ 1395 if ((void*)symname > elf->data_end) { \
312 printf("%s(%s) %5lX %15s %s\n", \ 1396 warnf("%s: corrupt ELF symbols", elf->filename); \
313 ((*found_sym == 0) ? "\n\t" : "\t"), \ 1397 ++sym; \
314 (char *)basename(filename), \ 1398 continue; \
315 (long)sym->st_size, \ 1399 } \
316 (char *)get_elfstttype(sym->st_info), \ 1400 scanelf_match_symname(elf, found_sym, \
317 symname); \ 1401 &ret, &ret_len, symname, \
318 *found_sym = 1; \ 1402 ELF##B##_ST_TYPE(EGET(sym->st_info)), \
319 } else if ((strcmp(find_sym, symname) == 0) || \ 1403 ELF##B##_ST_BIND(EGET(sym->st_info)), \
320 (strcmp(symname, versioned_symname) == 0)) \ 1404 ELF##B##_ST_VISIBILITY(EGET(sym->st_other)), \
321 (*found_sym)++; \ 1405 EGET(sym->st_shndx), \
1406 /* st_size can be 64bit, but no one is really that big, so screw em */ \
1407 EGET(sym->st_size)); \
322 } \ 1408 } \
323 ++sym; \ 1409 ++sym; \
324 } } 1410 } \
1411 }
325 FIND_SYM(32) 1412 FIND_SYM(32)
326 FIND_SYM(64) 1413 FIND_SYM(64)
327 } 1414 }
1415
1416break_out:
1417 if (be_wewy_wewy_quiet) return NULL;
1418
328 if (*find_sym != '*' && *found_sym) 1419 if (*find_sym != '*' && *found_sym)
329 return find_sym; 1420 return ret;
330 if (be_quiet) 1421 if (be_quiet)
331 return NULL; 1422 return NULL;
332 else 1423 else
333 return " - "; 1424 return " - ";
334} 1425}
1426
1427static const char *scanelf_file_sections(elfobj *elf, char *found_section)
1428{
1429 if (!find_section)
1430 return NULL;
1431
1432#define FIND_SECTION(B) \
1433 if (elf->elf_class == ELFCLASS ## B) { \
1434 size_t matched, n; \
1435 int invert; \
1436 const char *section_name; \
1437 Elf ## B ## _Shdr *section; \
1438 \
1439 matched = 0; \
1440 array_for_each(find_section_arr, n, section_name) { \
1441 invert = (*section_name == '!' ? 1 : 0); \
1442 section = SHDR ## B (elf_findsecbyname(elf, section_name + invert)); \
1443 if ((section == NULL && invert) || (section != NULL && !invert)) \
1444 ++matched; \
1445 } \
1446 \
1447 if (matched == array_cnt(find_section_arr)) \
1448 *found_section = 1; \
1449 }
1450 FIND_SECTION(32)
1451 FIND_SECTION(64)
1452
1453 if (be_wewy_wewy_quiet)
1454 return NULL;
1455
1456 if (*found_section)
1457 return find_section;
1458
1459 if (be_quiet)
1460 return NULL;
1461 else
1462 return " - ";
1463}
1464
335/* scan an elf file and show all the fun stuff */ 1465/* scan an elf file and show all the fun stuff */
336#define prints(str) fputs(str, stdout) 1466#define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
337static void scanelf_file(const char *filename) 1467static int scanelf_elfobj(elfobj *elf)
338{ 1468{
339 unsigned long i; 1469 unsigned long i;
340 char found_pax, found_stack, found_relro, found_textrel, 1470 char found_pax, found_phdr, found_relro, found_load, found_textrel,
341 found_rpath, found_needed, found_interp, found_sym, 1471 found_rpath, found_needed, found_interp, found_bind, found_soname,
342 found_file; 1472 found_sym, found_lib, found_file, found_textrels, found_section;
343 elfobj *elf;
344 struct stat st;
345 static char *out_buffer = NULL; 1473 static char *out_buffer = NULL;
346 static size_t out_len; 1474 static size_t out_len;
347 1475
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 = \ 1476 found_pax = found_phdr = found_relro = found_load = found_textrel = \
360 found_rpath = found_needed = found_interp = found_sym = \ 1477 found_rpath = found_needed = found_interp = found_bind = found_soname = \
361 found_file = 0; 1478 found_sym = found_lib = found_file = found_textrels = found_section = 0;
362 1479
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) 1480 if (be_verbose > 2)
370 printf("%s: scanning file {%s,%s}\n", filename, 1481 printf("%s: scanning file {%s,%s}\n", elf->filename,
371 get_elfeitype(elf, EI_CLASS, elf->elf_class), 1482 get_elfeitype(EI_CLASS, elf->elf_class),
372 get_elfeitype(elf, EI_DATA, elf->data[EI_DATA])); 1483 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
373 else if (be_verbose) 1484 else if (be_verbose > 1)
374 printf("%s: scanning file\n", filename); 1485 printf("%s: scanning file\n", elf->filename);
375 1486
376 /* init output buffer */ 1487 /* init output buffer */
377 if (!out_buffer) { 1488 if (!out_buffer) {
378 out_len = sizeof(char) * 80; 1489 out_len = sizeof(char) * 80;
379 out_buffer = (char*)xmalloc(out_len); 1490 out_buffer = xmalloc(out_len);
380 } 1491 }
381 *out_buffer = '\0'; 1492 *out_buffer = '\0';
382 1493
383 /* show the header */ 1494 /* show the header */
384 if (!be_quiet && show_banner) { 1495 if (!be_quiet && show_banner) {
385 for (i=0; out_format[i]; ++i) { 1496 for (i = 0; out_format[i]; ++i) {
386 if (out_format[i] != '%') continue; 1497 if (!IS_MODIFIER(out_format[i])) continue;
387 1498
388 switch (out_format[++i]) { 1499 switch (out_format[++i]) {
1500 case '+': break;
389 case '%': break; 1501 case '%': break;
1502 case '#': break;
1503 case 'F':
1504 case 'p':
390 case 'F': prints("FILE "); break; 1505 case 'f': prints("FILE "); found_file = 1; break;
391 case 'o': prints(" TYPE "); break; 1506 case 'o': prints(" TYPE "); break;
392 case 'x': prints(" PAX "); break; 1507 case 'x': prints(" PAX "); break;
393 case 'e': prints("STK/REL "); break; 1508 case 'e': prints("STK/REL/PTL "); break;
394 case 't': prints("TEXTREL "); break; 1509 case 't': prints("TEXTREL "); break;
395 case 'r': prints("RPATH "); break; 1510 case 'r': prints("RPATH "); break;
1511 case 'M': prints("CLASS "); break;
1512 case 'l':
396 case 'n': prints("NEEDED "); break; 1513 case 'n': prints("NEEDED "); break;
397 case 'i': prints("INTERP "); break; 1514 case 'i': prints("INTERP "); break;
1515 case 'b': prints("BIND "); break;
1516 case 'Z': prints("SIZE "); break;
1517 case 'S': prints("SONAME "); break;
398 case 's': prints("SYM "); break; 1518 case 's': prints("SYM "); break;
1519 case 'N': prints("LIB "); break;
1520 case 'T': prints("TEXTRELS "); break;
1521 case 'k': prints("SECTION "); break;
1522 case 'a': prints("ARCH "); break;
1523 case 'I': prints("OSABI "); break;
1524 case 'Y': prints("EABI "); break;
1525 case 'O': prints("PERM "); break;
1526 case 'D': prints("ENDIAN "); break;
1527 default: warnf("'%c' has no title ?", out_format[i]);
399 } 1528 }
400 } 1529 }
1530 if (!found_file) prints("FILE ");
401 prints("\n"); 1531 prints("\n");
1532 found_file = 0;
402 show_banner = 0; 1533 show_banner = 0;
403 } 1534 }
404 1535
405 /* dump all the good stuff */ 1536 /* dump all the good stuff */
406 for (i=0; out_format[i]; ++i) { 1537 for (i = 0; out_format[i]; ++i) {
407 const char *out; 1538 const char *out;
408 1539 const char *tmp;
409 /* make sure we trim leading spaces in quiet mode */ 1540 static char ubuf[sizeof(unsigned long)*2];
410 if (be_quiet && *out_buffer == ' ' && !out_buffer[1]) 1541 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); 1542 xchrcat(&out_buffer, out_format[i], &out_len);
415 continue; 1543 continue;
416 } 1544 }
417 1545
418 out = NULL; 1546 out = NULL;
1547 be_wewy_wewy_quiet = (out_format[i] == '#');
1548 be_semi_verbose = (out_format[i] == '+');
419 switch (out_format[++i]) { 1549 switch (out_format[++i]) {
1550 case '+':
1551 case '%':
1552 case '#':
420 case '%': xchrcat(&out_buffer, '%', &out_len); break; 1553 xchrcat(&out_buffer, out_format[i], &out_len); break;
421 case 'F': found_file = 1; xstrcat(&out_buffer, filename, &out_len); break; 1554 case 'F':
1555 found_file = 1;
1556 if (be_wewy_wewy_quiet) break;
1557 xstrcat(&out_buffer, elf->filename, &out_len);
1558 break;
1559 case 'p':
1560 found_file = 1;
1561 if (be_wewy_wewy_quiet) break;
1562 tmp = elf->filename;
1563 if (search_path) {
1564 ssize_t len_search = strlen(search_path);
1565 ssize_t len_file = strlen(elf->filename);
1566 if (!strncmp(elf->filename, search_path, len_search) && \
1567 len_file > len_search)
1568 tmp += len_search;
1569 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1570 }
1571 xstrcat(&out_buffer, tmp, &out_len);
1572 break;
1573 case 'f':
1574 found_file = 1;
1575 if (be_wewy_wewy_quiet) break;
1576 tmp = strrchr(elf->filename, '/');
1577 tmp = (tmp == NULL ? elf->filename : tmp+1);
1578 xstrcat(&out_buffer, tmp, &out_len);
1579 break;
422 case 'o': out = get_elfetype(elf); break; 1580 case 'o': out = get_elfetype(elf); break;
423 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1581 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
424 case 'e': out = scanelf_file_stack(elf, &found_stack, &found_relro); break; 1582 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; 1583 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1584 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; 1585 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1586 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1587 case 'D': out = get_endian(elf); break;
1588 case 'O': out = strfileperms(elf->filename); break;
1589 case 'n':
427 case 'n': scanelf_file_needed(elf, &found_needed, &out_buffer, &out_len); break; 1590 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; 1591 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1592 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1593 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
429 case 's': out = scanelf_file_sym(elf, &found_sym, filename); break; 1594 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1595 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1596 case 'a': out = get_elfemtype(elf); break;
1597 case 'I': out = get_elfosabi(elf); break;
1598 case 'Y': out = get_elf_eabi(elf); break;
1599 case 'Z': snprintf(ubuf, sizeof(ubuf), "%lu", (unsigned long)elf->len); out = ubuf; break;;
1600 default: warnf("'%c' has no scan code?", out_format[i]);
430 } 1601 }
1602 if (out)
431 if (out) xstrcat(&out_buffer, out, &out_len); 1603 xstrcat(&out_buffer, out, &out_len);
432 } 1604 }
433 1605
434 if (!found_file) { 1606#define FOUND_SOMETHING() \
435 if (!be_quiet || found_pax || found_stack || found_textrel || \ 1607 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
436 found_rpath || found_needed || found_interp || found_sym) 1608 found_rpath || found_needed || found_interp || found_bind || \
1609 found_soname || found_sym || found_lib || found_textrels || found_section )
1610
1611 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1612 xchrcat(&out_buffer, ' ', &out_len);
437 xstrcat(&out_buffer, filename, &out_len); 1613 xstrcat(&out_buffer, elf->filename, &out_len);
438 } 1614 }
439 if (!(be_quiet && xemptybuffer(out_buffer))) 1615 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
440 puts(out_buffer); 1616 puts(out_buffer);
1617 fflush(stdout);
1618 }
441 1619
1620 return 0;
1621}
1622
1623/* scan a single elf */
1624static int scanelf_elf(const char *filename, int fd, size_t len)
1625{
1626 int ret = 1;
1627 size_t n;
1628 const char *match_etype;
1629 elfobj *elf;
1630
1631 /* Verify this is a real ELF */
1632 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1633 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1634 return 2;
1635 }
1636
1637 /* Possibly filter based on ELF bitness */
1638 switch (match_bits) {
1639 case 32:
1640 if (elf->elf_class != ELFCLASS32)
1641 goto done;
1642 break;
1643 case 64:
1644 if (elf->elf_class != ELFCLASS64)
1645 goto done;
1646 break;
1647 }
1648
1649 /* Possibly filter based on the ELF's e_type field */
1650 array_for_each(match_etypes, n, match_etype)
1651 if (etype_lookup(match_etype) == get_etype(elf))
1652 goto scanit;
1653 if (array_cnt(match_etypes))
1654 goto done;
1655
1656 scanit:
1657 ret = scanelf_elfobj(elf);
1658
1659 done:
442 unreadelf(elf); 1660 unreadelf(elf);
1661 return ret;
1662}
1663
1664/* scan an archive of elfs */
1665static int scanelf_archive(const char *filename, int fd, size_t len)
1666{
1667 archive_handle *ar;
1668 archive_member *m;
1669 char *ar_buffer;
1670 elfobj *elf;
1671
1672 ar = ar_open_fd(filename, fd);
1673 if (ar == NULL)
1674 return 1;
1675
1676 ar_buffer = mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1677 while ((m = ar_next(ar)) != NULL) {
1678 off_t cur_pos = lseek(fd, 0, SEEK_CUR);
1679 if (cur_pos == -1)
1680 errp("lseek() failed");
1681 elf = readelf_buffer(m->name, ar_buffer + cur_pos, m->size);
1682 if (elf) {
1683 scanelf_elfobj(elf);
1684 unreadelf(elf);
1685 }
1686 }
1687 munmap(ar_buffer, len);
1688
1689 return 0;
1690}
1691/* scan a file which may be an elf or an archive or some other magical beast */
1692static int scanelf_fileat(int dir_fd, const char *filename, const struct stat *st_cache)
1693{
1694 const struct stat *st = st_cache;
1695 struct stat symlink_st;
1696 int fd;
1697
1698 /* always handle regular files and handle symlinked files if no -y */
1699 if (S_ISLNK(st->st_mode)) {
1700 if (!scan_symlink)
1701 return 1;
1702 fstatat(dir_fd, filename, &symlink_st, 0);
1703 st = &symlink_st;
1704 }
1705
1706 if (!S_ISREG(st->st_mode)) {
1707 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1708 return 1;
1709 }
1710
1711 if (match_perms) {
1712 if ((st->st_mode | match_perms) != st->st_mode)
1713 return 1;
1714 }
1715 fd = openat(dir_fd, filename, (fix_elf ? O_RDWR : O_RDONLY) | O_CLOEXEC);
1716 if (fd == -1) {
1717 if (fix_elf && errno == ETXTBSY)
1718 warnp("%s: could not fix", filename);
1719 else if (be_verbose > 2)
1720 printf("%s: skipping file: %s\n", filename, strerror(errno));
1721 return 1;
1722 }
1723
1724 if (scanelf_elf(filename, fd, st->st_size) == 2) {
1725 /* if it isn't an ELF, maybe it's an .a archive */
1726 if (scan_archives)
1727 scanelf_archive(filename, fd, st->st_size);
1728
1729 /*
1730 * unreadelf() implicitly closes its fd, so only close it
1731 * when we are returning it in the non-ELF case
1732 */
1733 close(fd);
1734 }
1735
1736 return 0;
443} 1737}
444 1738
445/* scan a directory for ET_EXEC files and print when we find one */ 1739/* scan a directory for ET_EXEC files and print when we find one */
446static void scanelf_dir(const char *path) 1740static int scanelf_dirat(int dir_fd, const char *path)
447{ 1741{
448 register DIR *dir; 1742 register DIR *dir;
449 register struct dirent *dentry; 1743 register struct dirent *dentry;
450 struct stat st_top, st; 1744 struct stat st_top, st;
451 char buf[_POSIX_PATH_MAX]; 1745 char buf[__PAX_UTILS_PATH_MAX], *subpath;
452 size_t pathlen = 0, len = 0; 1746 size_t pathlen = 0, len = 0;
1747 int ret = 0;
1748 int subdir_fd;
453 1749
454 /* make sure path exists */ 1750 /* make sure path exists */
455 if (lstat(path, &st_top) == -1) { 1751 if (fstatat(dir_fd, path, &st_top, AT_SYMLINK_NOFOLLOW) == -1) {
456 if (be_verbose > 2) printf("%s: does not exist\n", path); 1752 if (be_verbose > 2) printf("%s: does not exist\n", path);
457 return; 1753 return 1;
458 } 1754 }
459 1755
460 /* ok, if it isn't a directory, assume we can open it */ 1756 /* ok, if it isn't a directory, assume we can open it */
461 if (!S_ISDIR(st_top.st_mode)) { 1757 if (!S_ISDIR(st_top.st_mode))
462 scanelf_file(path); 1758 return scanelf_fileat(dir_fd, path, &st_top);
463 return;
464 }
465 1759
466 /* now scan the dir looking for fun stuff */ 1760 /* now scan the dir looking for fun stuff */
467 if ((dir = opendir(path)) == NULL) { 1761 subdir_fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
468 warnf("could not opendir %s: %s", path, strerror(errno)); 1762 if (subdir_fd == -1)
1763 dir = NULL;
1764 else
1765 dir = fdopendir(subdir_fd);
1766 if (dir == NULL) {
1767 if (subdir_fd != -1)
1768 close(subdir_fd);
1769 else if (be_verbose > 2)
1770 printf("%s: skipping dir: %s\n", path, strerror(errno));
469 return; 1771 return 1;
470 } 1772 }
471 if (be_verbose) printf("%s: scanning dir\n", path); 1773 if (be_verbose > 1) printf("%s: scanning dir\n", path);
472 1774
473 pathlen = strlen(path); 1775 subpath = stpcpy(buf, path);
1776 if (subpath[-1] != '/')
1777 *subpath++ = '/';
1778 pathlen = subpath - buf;
474 while ((dentry = readdir(dir))) { 1779 while ((dentry = readdir(dir))) {
475 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1780 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
476 continue; 1781 continue;
1782
1783 if (fstatat(subdir_fd, dentry->d_name, &st, AT_SYMLINK_NOFOLLOW) == -1)
1784 continue;
1785
477 len = (pathlen + 1 + strlen(dentry->d_name) + 1); 1786 len = strlen(dentry->d_name);
478 if (len >= sizeof(buf)) { 1787 if (len + pathlen + 1 >= sizeof(buf)) {
479 warnf("Skipping '%s': len > sizeof(buf); %d > %d\n", path, (int)len, (int)sizeof(buf)); 1788 warnf("Skipping '%s%s': len > sizeof(buf); %zu > %zu\n",
1789 path, dentry->d_name, len + pathlen + 1, sizeof(buf));
480 continue; 1790 continue;
481 } 1791 }
482 sprintf(buf, "%s/%s", path, dentry->d_name); 1792 memcpy(subpath, dentry->d_name, len);
483 if (lstat(buf, &st) != -1) { 1793 subpath[len] = '\0';
1794
484 if (S_ISREG(st.st_mode)) 1795 if (S_ISREG(st.st_mode))
485 scanelf_file(buf); 1796 ret = scanelf_fileat(dir_fd, buf, &st);
486 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1797 else if (dir_recurse && S_ISDIR(st.st_mode)) {
487 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1798 if (dir_crossmount || (st_top.st_dev == st.st_dev))
488 scanelf_dir(buf); 1799 ret = scanelf_dirat(dir_fd, buf);
1800 }
1801 }
1802 closedir(dir);
1803
1804 return ret;
1805}
1806static int scanelf_dir(const char *path)
1807{
1808 return scanelf_dirat(root_fd, root_rel_path(path));
1809}
1810
1811static int scanelf_from_file(const char *filename)
1812{
1813 FILE *fp;
1814 char *p, *path;
1815 size_t len;
1816 int ret;
1817
1818 if (strcmp(filename, "-") == 0)
1819 fp = stdin;
1820 else if ((fp = fopen(filename, "r")) == NULL)
1821 return 1;
1822
1823 path = NULL;
1824 len = 0;
1825 ret = 0;
1826 while (getline(&path, &len, fp) != -1) {
1827 if ((p = strchr(path, '\n')) != NULL)
1828 *p = 0;
1829 search_path = path;
1830 ret = scanelf_dir(path);
1831 }
1832 free(path);
1833
1834 if (fp != stdin)
1835 fclose(fp);
1836
1837 return ret;
1838}
1839
1840#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1841
1842static int _load_ld_cache_config(const char *fname)
1843{
1844 FILE *fp = NULL;
1845 char *p, *path;
1846 size_t len;
1847 int curr_fd = -1;
1848
1849 fp = fopenat_r(root_fd, root_rel_path(fname));
1850 if (fp == NULL)
1851 return -1;
1852
1853 path = NULL;
1854 len = 0;
1855 while (getline(&path, &len, fp) != -1) {
1856 if ((p = strrchr(path, '\r')) != NULL)
1857 *p = 0;
1858 if ((p = strchr(path, '\n')) != NULL)
1859 *p = 0;
1860
1861 /* recursive includes of the same file will make this segfault. */
1862 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1863 glob_t gl;
1864 size_t x;
1865 const char *gpath;
1866
1867 /* re-use existing path buffer ... need to be creative */
1868 if (path[8] != '/')
1869 gpath = memcpy(path + 3, "/etc/", 5);
1870 else
1871 gpath = path + 8;
1872 if (root_fd != AT_FDCWD) {
1873 if (curr_fd == -1) {
1874 curr_fd = open(".", O_RDONLY|O_CLOEXEC);
1875 if (fchdir(root_fd))
1876 errp("unable to change to root dir");
1877 }
1878 gpath = root_rel_path(gpath);
489 } 1879 }
1880
1881 if (glob(gpath, 0, NULL, &gl) == 0) {
1882 for (x = 0; x < gl.gl_pathc; ++x) {
1883 /* try to avoid direct loops */
1884 if (strcmp(gl.gl_pathv[x], fname) == 0)
1885 continue;
1886 _load_ld_cache_config(gl.gl_pathv[x]);
1887 }
1888 globfree(&gl);
1889 }
1890
1891 /* failed globs are ignored by glibc */
1892 continue;
490 } 1893 }
1894
1895 if (*path != '/')
1896 continue;
1897
1898 xarraypush_str(ldpaths, path);
491 } 1899 }
492 closedir(dir); 1900 free(path);
1901
1902 fclose(fp);
1903
1904 if (curr_fd != -1) {
1905 if (fchdir(curr_fd))
1906 {/* don't care */}
1907 close(curr_fd);
1908 }
1909
1910 return 0;
1911}
1912
1913#elif defined(__FreeBSD__) || defined(__DragonFly__)
1914
1915static int _load_ld_cache_config(const char *fname)
1916{
1917 FILE *fp = NULL;
1918 char *b = NULL, *p;
1919 struct elfhints_hdr hdr;
1920
1921 fp = fopenat_r(root_fd, root_rel_path(fname));
1922 if (fp == NULL)
1923 return -1;
1924
1925 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1926 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1927 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1928 {
1929 fclose(fp);
1930 return -1;
1931 }
1932
1933 b = xmalloc(hdr.dirlistlen + 1);
1934 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1935 fclose(fp);
1936 free(b);
1937 return -1;
1938 }
1939
1940 while ((p = strsep(&b, ":"))) {
1941 if (*p == '\0')
1942 continue;
1943 xarraypush_str(ldpaths, p);
1944 }
1945
1946 free(b);
1947 fclose(fp);
1948 return 0;
1949}
1950
1951#else
1952#ifdef __ELF__
1953#warning Cache config support not implemented for your target
1954#endif
1955static int _load_ld_cache_config(const char *fname)
1956{
1957 return 0;
1958}
1959#endif
1960
1961static void load_ld_cache_config(const char *fname)
1962{
1963 bool scan_l, scan_ul, scan_ull;
1964 size_t n;
1965 const char *ldpath;
1966
1967 _load_ld_cache_config(fname);
1968
1969 scan_l = scan_ul = scan_ull = false;
1970 array_for_each(ldpaths, n, ldpath) {
1971 if (!scan_l && !strcmp(ldpath, "/lib")) scan_l = true;
1972 if (!scan_ul && !strcmp(ldpath, "/usr/lib")) scan_ul = true;
1973 if (!scan_ull && !strcmp(ldpath, "/usr/local/lib")) scan_ull = true;
1974 }
1975
1976 if (!scan_l) xarraypush_str(ldpaths, "/lib");
1977 if (!scan_ul) xarraypush_str(ldpaths, "/usr/lib");
1978 if (!scan_ull) xarraypush_str(ldpaths, "/usr/local/lib");
493} 1979}
494 1980
495/* scan /etc/ld.so.conf for paths */ 1981/* scan /etc/ld.so.conf for paths */
496static void scanelf_ldpath() 1982static void scanelf_ldpath(void)
497{ 1983{
498 char scan_l, scan_ul, scan_ull; 1984 size_t n;
499 char *path, *p; 1985 const char *ldpath;
500 FILE *fp;
501 1986
502 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1987 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); 1988 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} 1989}
526 1990
527/* scan env PATH for paths */ 1991/* scan env PATH for paths */
528static void scanelf_envpath() 1992static void scanelf_envpath(void)
529{ 1993{
530 char *path, *p; 1994 char *path, *p;
531 1995
532 path = getenv("PATH"); 1996 path = getenv("PATH");
533 if (!path) 1997 if (!path)
540 } 2004 }
541 2005
542 free(path); 2006 free(path);
543} 2007}
544 2008
545 2009/* 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" 2010#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZCBhV"
549#define a_argument required_argument 2011#define a_argument required_argument
550static struct option const long_opts[] = { 2012static struct option const long_opts[] = {
551 {"path", no_argument, NULL, 'p'}, 2013 {"path", no_argument, NULL, 'p'},
552 {"ldpath", no_argument, NULL, 'l'}, 2014 {"ldpath", no_argument, NULL, 'l'},
2015 {"use-ldpath",no_argument, NULL, 129},
2016 {"root", a_argument, NULL, 128},
553 {"recursive", no_argument, NULL, 'R'}, 2017 {"recursive", no_argument, NULL, 'R'},
554 {"mount", no_argument, NULL, 'm'}, 2018 {"mount", no_argument, NULL, 'm'},
555 {"symlink", no_argument, NULL, 'y'}, 2019 {"symlink", no_argument, NULL, 'y'},
2020 {"archives", no_argument, NULL, 'A'},
2021 {"ldcache", no_argument, NULL, 'L'},
2022 {"fix", no_argument, NULL, 'X'},
2023 {"setpax", a_argument, NULL, 'z'},
556 {"pax", no_argument, NULL, 'x'}, 2024 {"pax", no_argument, NULL, 'x'},
557 {"header", no_argument, NULL, 'e'}, 2025 {"header", no_argument, NULL, 'e'},
558 {"textrel", no_argument, NULL, 't'}, 2026 {"textrel", no_argument, NULL, 't'},
559 {"rpath", no_argument, NULL, 'r'}, 2027 {"rpath", no_argument, NULL, 'r'},
560 {"needed", no_argument, NULL, 'n'}, 2028 {"needed", no_argument, NULL, 'n'},
561 {"interp", no_argument, NULL, 'i'}, 2029 {"interp", no_argument, NULL, 'i'},
2030 {"bind", no_argument, NULL, 'b'},
2031 {"soname", no_argument, NULL, 'S'},
562 {"symbol", a_argument, NULL, 's'}, 2032 {"symbol", a_argument, NULL, 's'},
2033 {"section", a_argument, NULL, 'k'},
2034 {"lib", a_argument, NULL, 'N'},
2035 {"gmatch", no_argument, NULL, 'g'},
2036 {"textrels", no_argument, NULL, 'T'},
2037 {"etype", a_argument, NULL, 'E'},
2038 {"bits", a_argument, NULL, 'M'},
2039 {"endian", no_argument, NULL, 'D'},
2040 {"osabi", no_argument, NULL, 'I'},
2041 {"eabi", no_argument, NULL, 'Y'},
2042 {"perms", a_argument, NULL, 'O'},
2043 {"size", no_argument, NULL, 'Z'},
563 {"all", no_argument, NULL, 'a'}, 2044 {"all", no_argument, NULL, 'a'},
564 {"quiet", no_argument, NULL, 'q'}, 2045 {"quiet", no_argument, NULL, 'q'},
565 {"verbose", no_argument, NULL, 'v'}, 2046 {"verbose", no_argument, NULL, 'v'},
566 {"format", a_argument, NULL, 'F'}, 2047 {"format", a_argument, NULL, 'F'},
2048 {"from", a_argument, NULL, 'f'},
567 {"file", a_argument, NULL, 'o'}, 2049 {"file", a_argument, NULL, 'o'},
2050 {"nocolor", no_argument, NULL, 'C'},
568 {"nobanner", no_argument, NULL, 'B'}, 2051 {"nobanner", no_argument, NULL, 'B'},
569 {"help", no_argument, NULL, 'h'}, 2052 {"help", no_argument, NULL, 'h'},
570 {"version", no_argument, NULL, 'V'}, 2053 {"version", no_argument, NULL, 'V'},
571 {NULL, no_argument, NULL, 0x0} 2054 {NULL, no_argument, NULL, 0x0}
572}; 2055};
2056
573static char *opts_help[] = { 2057static const char * const opts_help[] = {
574 "Scan all directories in PATH environment", 2058 "Scan all directories in PATH environment",
575 "Scan all directories in /etc/ld.so.conf", 2059 "Scan all directories in /etc/ld.so.conf",
2060 "Use ld.so.conf to show full path (use with -r/-n)",
2061 "Root directory (use with -l or -p)",
576 "Scan directories recursively", 2062 "Scan directories recursively",
577 "Don't recursively cross mount points", 2063 "Don't recursively cross mount points",
578 "Don't scan symlinks\n", 2064 "Don't scan symlinks",
2065 "Scan archives (.a files)",
2066 "Utilize ld.so.cache to show full path (use with -r/-n)",
2067 "Try and 'fix' bad things (use with -r/-e)",
2068 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
579 "Print PaX markings", 2069 "Print PaX markings",
580 "Print GNU_STACK markings", 2070 "Print GNU_STACK/PT_LOAD markings",
581 "Print TEXTREL information", 2071 "Print TEXTREL information",
582 "Print RPATH information", 2072 "Print RPATH information",
583 "Print NEEDED information", 2073 "Print NEEDED information",
584 "Print INTERP information", 2074 "Print INTERP information",
2075 "Print BIND information",
2076 "Print SONAME information",
585 "Find a specified symbol", 2077 "Find a specified symbol",
586 "Print all scanned info (-x -e -t -r)\n", 2078 "Find a specified section",
2079 "Find a specified library",
2080 "Use regex rather than string compare (with -s); specify twice for case insensitive",
2081 "Locate cause of TEXTREL",
2082 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
2083 "Print only ELF files matching numeric bits",
2084 "Print Endianness",
2085 "Print OSABI",
2086 "Print EABI (EM_ARM Only)",
2087 "Print only ELF files matching octal permissions",
2088 "Print ELF file size",
2089 "Print all useful/simple info\n",
587 "Only output 'bad' things", 2090 "Only output 'bad' things",
588 "Be verbose (can be specified more than once)", 2091 "Be verbose (can be specified more than once)",
589 "Use specified format for output", 2092 "Use specified format for output",
2093 "Read input stream from a filename",
590 "Write output stream to a filename", 2094 "Write output stream to a filename",
2095 "Don't emit color in output",
591 "Don't display the header", 2096 "Don't display the header",
592 "Print this help and exit", 2097 "Print this help and exit",
593 "Print version and exit", 2098 "Print version and exit",
594 NULL 2099 NULL
595}; 2100};
596 2101
597/* display usage and exit */ 2102/* display usage and exit */
598static void usage(int status) 2103static void usage(int status)
599{ 2104{
600 unsigned long i; 2105 const char a_arg[] = "<arg>";
2106 size_t a_arg_len = strlen(a_arg) + 2;
2107 size_t i;
2108 int optlen;
601 printf(" Scan ELF binaries for stuff\n\n" 2109 printf("* Scan ELF binaries for stuff\n\n"
602 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0); 2110 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
603 printf("Options: -[%s]\n", PARSE_FLAGS); 2111 printf("Options: -[%s]\n", PARSE_FLAGS);
2112
2113 /* prescan the --long opt length to auto-align */
2114 optlen = 0;
604 for (i = 0; long_opts[i].name; ++i) 2115 for (i = 0; long_opts[i].name; ++i) {
2116 int l = strlen(long_opts[i].name);
2117 if (long_opts[i].has_arg == a_argument)
2118 l += a_arg_len;
2119 optlen = max(l, optlen);
2120 }
2121
2122 for (i = 0; long_opts[i].name; ++i) {
2123 /* first output the short flag if it has one */
2124 if (long_opts[i].val > '~')
2125 printf(" ");
2126 else
2127 printf(" -%c, ", long_opts[i].val);
2128
2129 /* then the long flag */
605 if (long_opts[i].has_arg == no_argument) 2130 if (long_opts[i].has_arg == no_argument)
606 printf(" -%c, --%-13s %s\n", long_opts[i].val, 2131 printf("--%-*s", optlen, long_opts[i].name);
607 long_opts[i].name, opts_help[i]);
608 else 2132 else
609 printf(" -%c, --%-6s <arg> %s\n", long_opts[i].val, 2133 printf("--%s %s %*s", long_opts[i].name, a_arg,
610 long_opts[i].name, opts_help[i]); 2134 (int)(optlen - strlen(long_opts[i].name) - a_arg_len), "");
2135
2136 /* finally the help text */
2137 printf("* %s\n", opts_help[i]);
2138 }
2139
2140 puts("\nFor more information, see the scanelf(1) manpage");
611 exit(status); 2141 exit(status);
612} 2142}
613 2143
614/* parse command line arguments and preform needed actions */ 2144/* parse command line arguments and preform needed actions */
2145#define do_pax_state(option, flag) \
2146 if (islower(option)) { \
2147 flags &= ~PF_##flag; \
2148 flags |= PF_NO##flag; \
2149 } else { \
2150 flags &= ~PF_NO##flag; \
2151 flags |= PF_##flag; \
2152 }
2153static void parse_delimited(array_t *arr, char *arg, const char *delim)
2154{
2155 char *ele = strtok(arg, delim);
2156 if (!ele) /* edge case: -s '' */
2157 xarraypush_str(arr, "");
2158 while (ele) {
2159 xarraypush_str(arr, ele);
2160 ele = strtok(NULL, delim);
2161 }
2162}
615static void parseargs(int argc, char *argv[]) 2163static int parseargs(int argc, char *argv[])
616{ 2164{
617 int flag; 2165 int i;
2166 const char *from_file = NULL;
2167 int ret = 0;
2168 char load_cache_config = 0;
618 2169
619 opterr = 0; 2170 opterr = 0;
620 while ((flag=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 2171 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
621 switch (flag) { 2172 switch (i) {
622 2173
623 case 'V': 2174 case 'V':
624 printf("%s compiled %s\n%s\n" 2175 printf("pax-utils-%s: %s\n%s\n"
625 "%s written for Gentoo Linux by <solar and vapier @ gentoo.org>\n", 2176 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
626 __FILE__, __DATE__, rcsid, argv0); 2177 VERSION, __FILE__, rcsid, argv0);
627 exit(EXIT_SUCCESS); 2178 exit(EXIT_SUCCESS);
628 break; 2179 break;
629 case 'h': usage(EXIT_SUCCESS); break; 2180 case 'h': usage(EXIT_SUCCESS); break;
630 2181 case 'f':
2182 if (from_file) warn("You prob don't want to specify -f twice");
2183 from_file = optarg;
2184 break;
2185 case 'E':
2186 /* historically, this was comma delimited */
2187 parse_delimited(match_etypes, optarg, ",");
2188 break;
2189 case 'M':
2190 match_bits = atoi(optarg);
2191 if (match_bits == 0) {
2192 if (strcmp(optarg, "ELFCLASS32") == 0)
2193 match_bits = 32;
2194 if (strcmp(optarg, "ELFCLASS64") == 0)
2195 match_bits = 64;
2196 }
2197 break;
2198 case 'O':
2199 if (sscanf(optarg, "%o", &match_perms) == -1)
2200 match_bits = 0;
2201 break;
631 case 'o': { 2202 case 'o': {
632 FILE *fp = NULL;
633 fp = freopen(optarg, "w", stdout); 2203 if (freopen(optarg, "w", stdout) == NULL)
634 if (fp == NULL) 2204 errp("Could not freopen(%s)", optarg);
635 err("Could not open output stream '%s': %s", optarg, strerror(errno));
636 stdout = fp;
637 break; 2205 break;
638 } 2206 }
639 2207 case 'k':
2208 xarraypush_str(find_section_arr, optarg);
2209 break;
2210 case 's':
2211 /* historically, this was comma delimited */
2212 parse_delimited(find_sym_arr, optarg, ",");
2213 break;
2214 case 'N':
2215 xarraypush_str(find_lib_arr, optarg);
2216 break;
640 case 's': { 2217 case 'F': {
641 size_t len; 2218 if (out_format) warn("You prob don't want to specify -F twice");
642 find_sym = xstrdup(optarg); 2219 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; 2220 break;
647 } 2221 }
648
649 case 'F': { 2222 case 'z': {
650 out_format = strdup(optarg); 2223 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
2224 size_t x;
2225
2226 for (x = 0; x < strlen(optarg); x++) {
2227 switch (optarg[x]) {
2228 case 'p':
2229 case 'P':
2230 do_pax_state(optarg[x], PAGEEXEC);
2231 break;
2232 case 's':
2233 case 'S':
2234 do_pax_state(optarg[x], SEGMEXEC);
2235 break;
2236 case 'm':
2237 case 'M':
2238 do_pax_state(optarg[x], MPROTECT);
2239 break;
2240 case 'e':
2241 case 'E':
2242 do_pax_state(optarg[x], EMUTRAMP);
2243 break;
2244 case 'r':
2245 case 'R':
2246 do_pax_state(optarg[x], RANDMMAP);
2247 break;
2248 case 'x':
2249 case 'X':
2250 do_pax_state(optarg[x], RANDEXEC);
2251 break;
2252 default:
2253 break;
2254 }
2255 }
2256 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
2257 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
2258 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
2259 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
2260 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
2261 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
2262 setpax = flags;
651 break; 2263 break;
652 } 2264 }
653 2265 case 'Z': show_size = 1; break;
2266 case 'g': ++g_match; break;
2267 case 'L': load_cache_config = use_ldcache = 1; break;
654 case 'y': scan_symlink = 0; break; 2268 case 'y': scan_symlink = 0; break;
2269 case 'A': scan_archives = 1; break;
2270 case 'C': color_init(true); break;
655 case 'B': show_banner = 0; break; 2271 case 'B': show_banner = 0; break;
656 case 'l': scan_ldpath = 1; break; 2272 case 'l': load_cache_config = scan_ldpath = 1; break;
657 case 'p': scan_envpath = 1; break; 2273 case 'p': scan_envpath = 1; break;
658 case 'R': dir_recurse = 1; break; 2274 case 'R': dir_recurse = 1; break;
659 case 'm': dir_crossmount = 0; break; 2275 case 'm': dir_crossmount = 0; break;
2276 case 'X': ++fix_elf; break;
660 case 'x': show_pax = 1; break; 2277 case 'x': show_pax = 1; break;
661 case 'e': show_stack = 1; break; 2278 case 'e': show_phdr = 1; break;
662 case 't': show_textrel = 1; break; 2279 case 't': show_textrel = 1; break;
663 case 'r': show_rpath = 1; break; 2280 case 'r': show_rpath = 1; break;
664 case 'n': show_needed = 1; break; 2281 case 'n': show_needed = 1; break;
665 case 'i': show_interp = 1; break; 2282 case 'i': show_interp = 1; break;
666 case 'q': be_quiet = 1; break; 2283 case 'b': show_bind = 1; break;
2284 case 'S': show_soname = 1; break;
2285 case 'T': show_textrels = 1; break;
2286 case 'q': be_quiet = min(be_quiet, 20) + 1; break;
667 case 'v': be_verbose = (be_verbose % 20) + 1; break; 2287 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; 2288 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
669 2289 case 'D': show_endian = 1; break;
2290 case 'I': show_osabi = 1; break;
2291 case 'Y': show_eabi = 1; break;
2292 case 128:
2293 root_fd = open(optarg, O_RDONLY|O_CLOEXEC);
2294 if (root_fd == -1)
2295 err("Could not open root: %s", optarg);
2296 break;
2297 case 129: load_cache_config = use_ldpath = 1; break;
670 case ':': 2298 case ':':
671 warn("Option missing parameter\n"); 2299 err("Option '%c' is missing parameter", optopt);
672 usage(EXIT_FAILURE);
673 break;
674 case '?': 2300 case '?':
675 warn("Unknown option\n"); 2301 err("Unknown option '%c' or argument missing", optopt);
676 usage(EXIT_FAILURE);
677 break;
678 default: 2302 default:
679 err("Unhandled option '%c'", flag); 2303 err("Unhandled option '%c'; please report this", i);
680 break;
681 } 2304 }
682 } 2305 }
2306 if (show_textrels && be_verbose)
2307 objdump = which("objdump", "OBJDUMP");
2308 /* precompile all the regexes */
2309 if (g_match) {
2310 regex_t preg;
2311 const char *this_sym;
2312 size_t n;
2313 int flags = REG_EXTENDED | REG_NOSUB | (g_match > 1 ? REG_ICASE : 0);
683 2314
684 if (be_quiet && be_verbose) 2315 array_for_each(find_sym_arr, n, this_sym) {
685 err("You can be quiet or you can be verbose, not both, stupid"); 2316 /* see scanelf_match_symname for logic info */
2317 switch (this_sym[0]) {
2318 case '%':
2319 while (*(this_sym++))
2320 if (*this_sym == '%') {
2321 ++this_sym;
2322 break;
2323 }
2324 break;
2325 case '+':
2326 case '-':
2327 ++this_sym;
2328 break;
2329 }
2330 if (*this_sym == '*')
2331 ++this_sym;
686 2332
2333 ret = regcomp(&preg, this_sym, flags);
2334 if (ret) {
2335 char err[256];
2336 regerror(ret, &preg, err, sizeof(err));
2337 err("regcomp of %s failed: %s", this_sym, err);
2338 }
2339 xarraypush(find_sym_regex_arr, &preg, sizeof(preg));
2340 }
2341 }
2342 /* flatten arrays for display */
2343 find_sym = array_flatten_str(find_sym_arr);
2344 find_lib = array_flatten_str(find_lib_arr);
2345 find_section = array_flatten_str(find_section_arr);
687 /* let the format option override all other options */ 2346 /* let the format option override all other options */
688 if (out_format) { 2347 if (out_format) {
689 show_pax = show_stack = show_textrel = show_rpath = show_needed = show_interp = 0; 2348 show_pax = show_phdr = show_textrel = show_rpath = \
2349 show_needed = show_interp = show_bind = show_soname = \
2350 show_textrels = show_perms = show_endian = show_size = \
2351 show_osabi = show_eabi = 0;
690 for (flag=0; out_format[flag]; ++flag) { 2352 for (i = 0; out_format[i]; ++i) {
691 if (out_format[flag] != '%') continue; 2353 if (!IS_MODIFIER(out_format[i])) continue;
692 2354
693 switch (out_format[++flag]) { 2355 switch (out_format[++i]) {
2356 case '+': break;
694 case '%': break; 2357 case '%': break;
2358 case '#': break;
695 case 'F': break; 2359 case 'F': break;
2360 case 'p': break;
2361 case 'f': break;
2362 case 'k': break;
696 case 's': break; 2363 case 's': break;
2364 case 'N': break;
697 case 'o': break; 2365 case 'o': break;
2366 case 'a': break;
2367 case 'M': break;
2368 case 'Z': show_size = 1; break;
2369 case 'D': show_endian = 1; break;
2370 case 'I': show_osabi = 1; break;
2371 case 'Y': show_eabi = 1; break;
2372 case 'O': show_perms = 1; break;
698 case 'x': show_pax = 1; break; 2373 case 'x': show_pax = 1; break;
699 case 'e': show_stack = 1; break; 2374 case 'e': show_phdr = 1; break;
700 case 't': show_textrel = 1; break; 2375 case 't': show_textrel = 1; break;
701 case 'r': show_rpath = 1; break; 2376 case 'r': show_rpath = 1; break;
702 case 'n': show_needed = 1; break; 2377 case 'n': show_needed = 1; break;
703 case 'i': show_interp = 1; break; 2378 case 'i': show_interp = 1; break;
2379 case 'b': show_bind = 1; break;
2380 case 'S': show_soname = 1; break;
2381 case 'T': show_textrels = 1; break;
704 default: 2382 default:
705 err("Invalid format specifier '%c' (byte %i)", 2383 err("invalid format specifier '%c' (byte %i)",
706 out_format[flag], flag+1); 2384 out_format[i], i+1);
707 } 2385 }
708 } 2386 }
709 2387
710 /* construct our default format */ 2388 /* construct our default format */
711 } else { 2389 } else {
712 size_t fmt_len = 30; 2390 size_t fmt_len = 30;
713 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 2391 out_format = xmalloc(sizeof(char) * fmt_len);
2392 *out_format = '\0';
714 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 2393 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
715 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len); 2394 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
2395 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
2396 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
2397 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
716 if (show_stack) xstrcat(&out_format, "%e ", &fmt_len); 2398 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
2399 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
2400 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
717 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 2401 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
718 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 2402 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
719 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 2403 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
720 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 2404 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
2405 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
2406 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
2407 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
721 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len); 2408 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
2409 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
2410 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
722 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 2411 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
723 } 2412 }
724 if (be_verbose > 2) printf("Format: %s\n", out_format); 2413 if (be_verbose > 2) printf("Format: %s\n", out_format);
725 2414
726 /* now lets actually do the scanning */ 2415 /* now lets actually do the scanning */
2416 if (load_cache_config)
2417 load_ld_cache_config(__PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
727 if (scan_ldpath) scanelf_ldpath(); 2418 if (scan_ldpath) scanelf_ldpath();
728 if (scan_envpath) scanelf_envpath(); 2419 if (scan_envpath) scanelf_envpath();
2420 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
2421 from_file = "-";
2422 if (from_file) {
2423 scanelf_from_file(from_file);
2424 from_file = *argv;
2425 }
729 if (optind == argc && !scan_ldpath && !scan_envpath) 2426 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
730 err("Nothing to scan !?"); 2427 err("Nothing to scan !?");
731 while (optind < argc) 2428 while (optind < argc) {
732 scanelf_dir(argv[optind++]); 2429 search_path = argv[optind++];
2430 ret = scanelf_dir(search_path);
2431 }
733 2432
2433#ifdef __PAX_UTILS_CLEANUP
734 /* clean up */ 2434 /* clean up */
735 if (find_sym) { 2435 xarrayfree(ldpaths);
2436 xarrayfree(find_sym_arr);
2437 xarrayfree(find_lib_arr);
2438 xarrayfree(find_section_arr);
736 free(find_sym); 2439 free(find_sym);
737 free(versioned_symname); 2440 free(find_lib);
2441 free(find_section);
2442 {
2443 size_t n;
2444 regex_t *preg;
2445 array_for_each(find_sym_regex_arr, n, preg)
2446 regfree(preg);
2447 xarrayfree(find_sym_regex_arr);
738 } 2448 }
739 if (out_format) free(out_format);
740}
741 2449
2450 if (ldcache != 0)
2451 munmap(ldcache, ldcache_size);
2452#endif
742 2453
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; 2454 return ret;
750} 2455}
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 2456
761 new_len = strlen(*dst) + strlen(src); 2457static 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{ 2458{
773 static char my_app[2]; 2459 const char *delims = " \t\n";
774 my_app[0] = append; 2460 char **envvals = NULL;
775 my_app[1] = '\0'; 2461 char *env, *s;
776 xstrcat(dst, my_app, curr_len); 2462 int nentry;
777} 2463
778static int xemptybuffer(const char *buff) 2464 if ((env = getenv(envvar)) == NULL)
779{
780 long i;
781 for (i=0; buff[i]; ++i)
782 if (buff[i] != ' ')
783 return 0; 2465 return NULL;
2466
2467 env = xstrdup(env);
2468 if (env == NULL)
784 return 1; 2469 return NULL;
785}
786 2470
2471 s = strtok(env, delims);
2472 if (s == NULL) {
2473 free(env);
2474 return NULL;
2475 }
787 2476
2477 nentry = 0;
2478 while (s != NULL) {
2479 ++nentry;
2480 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
2481 envvals[nentry-1] = s;
2482 s = strtok(NULL, delims);
2483 }
2484 envvals[nentry] = NULL;
2485
2486 /* don't want to free(env) as it contains the memory that backs
2487 * the envvals array of strings */
2488 return envvals;
2489}
2490
2491static void parseenv(void)
2492{
2493 color_init(false);
2494 qa_textrels = get_split_env("QA_TEXTRELS");
2495 qa_execstack = get_split_env("QA_EXECSTACK");
2496 qa_wx_load = get_split_env("QA_WX_LOAD");
2497}
2498
2499#ifdef __PAX_UTILS_CLEANUP
2500static void cleanup(void)
2501{
2502 free(out_format);
2503 free(qa_textrels);
2504 free(qa_execstack);
2505 free(qa_wx_load);
2506}
2507#endif
788 2508
789int main(int argc, char *argv[]) 2509int main(int argc, char *argv[])
790{ 2510{
2511 int ret;
791 if (argc < 2) 2512 if (argc < 2)
792 usage(EXIT_FAILURE); 2513 usage(EXIT_FAILURE);
2514 parseenv();
793 parseargs(argc, argv); 2515 ret = parseargs(argc, argv);
794 fclose(stdout); 2516 fclose(stdout);
795 return EXIT_SUCCESS; 2517#ifdef __PAX_UTILS_CLEANUP
2518 cleanup();
2519 warn("The calls to add/delete heap should be off:\n"
2520 "\t- 1 due to the out_buffer not being freed in scanelf_fileat()\n"
2521 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
2522#endif
2523 return ret;
796} 2524}
2525
2526/* Match filename against entries in matchlist, return TRUE
2527 * if the file is listed */
2528static int file_matches_list(const char *filename, char **matchlist)
2529{
2530 char **file;
2531 char *match;
2532 char buf[__PAX_UTILS_PATH_MAX];
2533
2534 if (matchlist == NULL)
2535 return 0;
2536
2537 for (file = matchlist; *file != NULL; file++) {
2538 if (search_path) {
2539 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2540 match = buf;
2541 } else {
2542 match = *file;
2543 }
2544 if (fnmatch(match, filename, 0) == 0)
2545 return 1;
2546 }
2547 return 0;
2548}

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