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Revision 1.44 Revision 1.274
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 1.274 2015/02/22 02:27:39 vapier Exp $
6 * 5 *
7 ******************************************************************** 6 * Copyright 2003-2012 Ned Ludd - <solar@gentoo.org>
8 * This program is free software; you can redistribute it and/or 7 * Copyright 2004-2012 Mike Frysinger - <vapier@gentoo.org>
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of the
11 * License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
21 * MA 02111-1307, USA.
22 */ 8 */
23 9
24#include <stdio.h>
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 1.274 2015/02/22 02:27:39 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 uint64_t offset = 0;
273 1073
274 if (!show_interp) return NULL; 1074 if (!show_interp) return NULL;
275 1075
1076 if (elf->phdr) {
1077 /* Walk all the program headers to find the PT_INTERP */
1078#define SHOW_PT_INTERP(B) \
1079 if (elf->elf_class == ELFCLASS ## B) { \
1080 size_t i; \
1081 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1082 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1083 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
1084 if (EGET(phdr[i].p_type) == PT_INTERP) { \
1085 offset = EGET(phdr[i].p_offset); \
1086 break; \
1087 } \
1088 } \
1089 }
1090 SHOW_PT_INTERP(32)
1091 SHOW_PT_INTERP(64)
1092 } else if (elf->shdr) {
1093 /* Use the section headers to find it */
276 strtbl_void = elf_findsecbyname(elf, ".interp"); 1094 void *strtbl_void = elf_findsecbyname(elf, ".interp");
277 1095
278 if (strtbl_void) {
279#define SHOW_INTERP(B) \ 1096#define SHOW_INTERP(B) \
280 if (elf->elf_class == ELFCLASS ## B) { \ 1097 if (elf->elf_class == ELFCLASS ## B) { \
281 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 1098 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
282 *found_interp = 1; \ 1099 offset = EGET(strtbl->sh_offset); \
283 return elf->data + EGET(strtbl->sh_offset); \
284 } 1100 }
1101 if (strtbl_void) {
285 SHOW_INTERP(32) 1102 SHOW_INTERP(32)
286 SHOW_INTERP(64) 1103 SHOW_INTERP(64)
287 } 1104 }
1105 }
1106
1107 /* Validate the pointer even if we don't use it in output */
1108 if (offset && offset <= (uint64_t)elf->len) {
1109 char *interp = elf->data + offset;
1110
1111 /* If it isn't a C pointer, it's garbage */
1112 if (memchr(interp, 0, elf->len - offset)) {
1113 *found_interp = 1;
1114 if (!be_wewy_wewy_quiet)
1115 return interp;
1116 }
1117 }
1118
288 return NULL; 1119 return NULL;
289} 1120}
290static char *scanelf_file_sym(elfobj *elf, char *found_sym, const char *filename) 1121static const char *scanelf_file_bind(elfobj *elf, char *found_bind)
291{ 1122{
292 unsigned long i; 1123 unsigned long i;
1124 struct stat s;
1125 bool dynamic = false;
1126
1127 if (!show_bind) return NULL;
1128 if (!elf->phdr) return NULL;
1129
1130#define SHOW_BIND(B) \
1131 if (elf->elf_class == ELFCLASS ## B) { \
1132 Elf ## B ## _Dyn *dyn; \
1133 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1134 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1135 Elf ## B ## _Off offset; \
1136 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1137 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1138 dynamic = true; \
1139 offset = EGET(phdr[i].p_offset); \
1140 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
1141 dyn = DYN ## B (elf->vdata + offset); \
1142 while (EGET(dyn->d_tag) != DT_NULL) { \
1143 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
1144 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
1145 { \
1146 if (be_quiet) return NULL; \
1147 *found_bind = 1; \
1148 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
1149 } \
1150 ++dyn; \
1151 } \
1152 } \
1153 }
1154 SHOW_BIND(32)
1155 SHOW_BIND(64)
1156
1157 if (be_wewy_wewy_quiet) return NULL;
1158
1159 /* don't output anything if quiet mode and the ELF is static or not setuid */
1160 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
1161 return NULL;
1162 } else {
1163 *found_bind = 1;
1164 return dynamic ? "LAZY" : "STATIC";
1165 }
1166}
1167static char *scanelf_file_soname(elfobj *elf, char *found_soname)
1168{
1169 unsigned long i;
1170 char *soname;
1171 void *strtbl_void;
1172
1173 if (!show_soname) return NULL;
1174
1175 strtbl_void = elf_findsecbyname(elf, ".dynstr");
1176
1177 if (elf->phdr && strtbl_void) {
1178#define SHOW_SONAME(B) \
1179 if (elf->elf_class == ELFCLASS ## B) { \
1180 Elf ## B ## _Dyn *dyn; \
1181 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1182 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1183 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
1184 Elf ## B ## _Off offset; \
1185 /* only look for soname in shared objects */ \
1186 if (EGET(ehdr->e_type) != ET_DYN) \
1187 return NULL; \
1188 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1189 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1190 offset = EGET(phdr[i].p_offset); \
1191 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
1192 dyn = DYN ## B (elf->vdata + offset); \
1193 while (EGET(dyn->d_tag) != DT_NULL) { \
1194 if (EGET(dyn->d_tag) == DT_SONAME) { \
1195 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
1196 if (offset >= (Elf ## B ## _Off)elf->len) { \
1197 ++dyn; \
1198 continue; \
1199 } \
1200 soname = elf->data + offset; \
1201 *found_soname = 1; \
1202 return (be_wewy_wewy_quiet ? NULL : soname); \
1203 } \
1204 ++dyn; \
1205 } \
1206 } }
1207 SHOW_SONAME(32)
1208 SHOW_SONAME(64)
1209 }
1210
1211 return NULL;
1212}
1213
1214/*
1215 * We support the symbol form:
1216 * [%[modifiers]%][[+-]<symbol name>][,[.....]]
1217 * If the symbol name is empty, then all symbols are matched.
1218 * If the symbol name is a glob ("*"), then all symbols are dumped (debug).
1219 * Do not rely on this output format at all.
1220 * Otherwise the symbol name is used to search (either regex or string compare).
1221 * If the first char of the symbol name is a plus ("+"), then only match
1222 * defined symbols. If it's a minus ("-"), only match undefined symbols.
1223 * Putting modifiers in between the percent signs allows for more in depth
1224 * filters. There are groups of modifiers. If you don't specify a member
1225 * of a group, then all types in that group are matched. The current
1226 * groups and their types are:
1227 * STT group: STT_NOTYPE:n STT_OBJECT:o STT_FUNC:f STT_FILE:F
1228 * STB group: STB_LOCAL:l STB_GLOBAL:g STB_WEAK:w
1229 * STV group: STV_DEFAULT:p STV_INTERNAL:i STV_HIDDEN:h STV_PROTECTED:P
1230 * SHN group: SHN_UNDEF:u SHN_ABS:a SHN_COMMON:c {defined}:d
1231 * The "defined" value in the SHN group does not correspond to a SHN_xxx define.
1232 * You can search for multiple symbols at once by seperating with a comma (",").
1233 *
1234 * Some examples:
1235 * ELFs with a weak function "foo":
1236 * scanelf -s %wf%foo <ELFs>
1237 * ELFs that define the symbol "main":
1238 * scanelf -s +main <ELFs>
1239 * scanelf -s %d%main <ELFs>
1240 * ELFs that refer to the undefined symbol "brk":
1241 * scanelf -s -brk <ELFs>
1242 * scanelf -s %u%brk <ELFs>
1243 * All global defined objects in an ELF:
1244 * scanelf -s %ogd% <ELF>
1245 */
1246static void
1247scanelf_match_symname(elfobj *elf, char *found_sym, char **ret, size_t *ret_len, const char *symname,
1248 unsigned int stt, unsigned int stb, unsigned int stv, unsigned int shn, unsigned long size)
1249{
1250 const char *this_sym;
1251 size_t n;
1252
1253 array_for_each(find_sym_arr, n, this_sym) {
1254 bool inc_notype, inc_object, inc_func, inc_file,
1255 inc_local, inc_global, inc_weak,
1256 inc_visdef, inc_intern, inc_hidden, inc_prot,
1257 inc_def, inc_undef, inc_abs, inc_common;
1258
1259 /* symbol selection! */
1260 inc_notype = inc_object = inc_func = inc_file =
1261 inc_local = inc_global = inc_weak =
1262 inc_visdef = inc_intern = inc_hidden = inc_prot =
1263 inc_def = inc_undef = inc_abs = inc_common =
1264 (*this_sym != '%');
1265
1266 /* parse the contents of %...% */
1267 if (!inc_notype) {
1268 while (*(this_sym++)) {
1269 if (*this_sym == '%') {
1270 ++this_sym;
1271 break;
1272 }
1273 switch (*this_sym) {
1274 case 'n': inc_notype = true; break;
1275 case 'o': inc_object = true; break;
1276 case 'f': inc_func = true; break;
1277 case 'F': inc_file = true; break;
1278 case 'l': inc_local = true; break;
1279 case 'g': inc_global = true; break;
1280 case 'w': inc_weak = true; break;
1281 case 'p': inc_visdef = true; break;
1282 case 'i': inc_intern = true; break;
1283 case 'h': inc_hidden = true; break;
1284 case 'P': inc_prot = true; break;
1285 case 'd': inc_def = true; break;
1286 case 'u': inc_undef = true; break;
1287 case 'a': inc_abs = true; break;
1288 case 'c': inc_common = true; break;
1289 default: err("invalid symbol selector '%c'", *this_sym);
1290 }
1291 }
1292
1293 /* If no types are matched, not match all */
1294 if (!inc_notype && !inc_object && !inc_func && !inc_file)
1295 inc_notype = inc_object = inc_func = inc_file = true;
1296 if (!inc_local && !inc_global && !inc_weak)
1297 inc_local = inc_global = inc_weak = true;
1298 if (!inc_visdef && !inc_intern && !inc_hidden && !inc_prot)
1299 inc_visdef = inc_intern = inc_hidden = inc_prot = true;
1300 if (!inc_def && !inc_undef && !inc_abs && !inc_common)
1301 inc_def = inc_undef = inc_abs = inc_common = true;
1302
1303 /* backwards compat for defined/undefined short hand */
1304 } else if (*this_sym == '+') {
1305 inc_undef = false;
1306 ++this_sym;
1307 } else if (*this_sym == '-') {
1308 inc_def = inc_abs = inc_common = false;
1309 ++this_sym;
1310 }
1311
1312 /* filter symbols */
1313 if ((!inc_notype && stt == STT_NOTYPE ) || \
1314 (!inc_object && stt == STT_OBJECT ) || \
1315 (!inc_func && stt == STT_FUNC ) || \
1316 (!inc_file && stt == STT_FILE ) || \
1317 (!inc_local && stb == STB_LOCAL ) || \
1318 (!inc_global && stb == STB_GLOBAL ) || \
1319 (!inc_weak && stb == STB_WEAK ) || \
1320 (!inc_visdef && stv == STV_DEFAULT ) || \
1321 (!inc_intern && stv == STV_INTERNAL ) || \
1322 (!inc_hidden && stv == STV_HIDDEN ) || \
1323 (!inc_prot && stv == STV_PROTECTED) || \
1324 (!inc_def && shn && shn < SHN_LORESERVE) || \
1325 (!inc_undef && shn == SHN_UNDEF ) || \
1326 (!inc_abs && shn == SHN_ABS ) || \
1327 (!inc_common && shn == SHN_COMMON ))
1328 continue;
1329
1330 if (*this_sym == '*') {
1331 /* a "*" symbol gets you debug output */
1332 printf("%s(%s) %5lX %-15s %-15s %-15s %-15s %s\n",
1333 ((*found_sym == 0) ? "\n\t" : "\t"),
1334 elf->base_filename,
1335 size,
1336 get_elfstttype(stt),
1337 get_elfstbtype(stb),
1338 get_elfstvtype(stv),
1339 get_elfshntype(shn),
1340 symname);
1341 goto matched;
1342
1343 } else {
1344 if (g_match) {
1345 /* regex match the symbol */
1346 if (regexec(find_sym_regex_arr->eles[n], symname, 0, NULL, 0) == REG_NOMATCH)
1347 continue;
1348
1349 } else if (*this_sym) {
1350 /* give empty symbols a "pass", else do a normal compare */
1351 const size_t len = strlen(this_sym);
1352 if (!(strncmp(this_sym, symname, len) == 0 &&
1353 /* Accept unversioned symbol names */
1354 (symname[len] == '\0' || symname[len] == '@')))
1355 continue;
1356 }
1357
1358 if (be_semi_verbose) {
1359 char buf[1024];
1360 snprintf(buf, sizeof(buf), "%lX %s %s",
1361 size,
1362 get_elfstttype(stt),
1363 this_sym);
1364 *ret = xstrdup(buf);
1365 } else {
1366 if (*ret) xchrcat(ret, ',', ret_len);
1367 xstrcat(ret, symname, ret_len);
1368 }
1369
1370 goto matched;
1371 }
1372 }
1373
1374 return;
1375
1376 matched:
1377 *found_sym = 1;
1378}
1379
1380static const char *scanelf_file_sym(elfobj *elf, char *found_sym)
1381{
1382 char *ret;
293 void *symtab_void, *strtab_void; 1383 void *symtab_void, *strtab_void;
294 1384
295 if (!find_sym) return NULL; 1385 if (!find_sym) return NULL;
1386 ret = NULL;
296 1387
297 symtab_void = elf_findsecbyname(elf, ".symtab"); 1388 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
298 strtab_void = elf_findsecbyname(elf, ".strtab");
299 1389
300 if (symtab_void && strtab_void) { 1390 if (symtab_void && strtab_void) {
301#define FIND_SYM(B) \ 1391#define FIND_SYM(B) \
302 if (elf->elf_class == ELFCLASS ## B) { \ 1392 if (elf->elf_class == ELFCLASS ## B) { \
303 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 1393 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
304 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 1394 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
305 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 1395 Elf ## B ## _Sym *sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
306 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 1396 Elf ## B ## _Word i, cnt = EGET(symtab->sh_entsize); \
307 char *symname; \ 1397 char *symname; \
1398 size_t ret_len = 0; \
1399 if (cnt) \
1400 cnt = EGET(symtab->sh_size) / cnt; \
308 for (i = 0; i < cnt; ++i) { \ 1401 for (i = 0; i < cnt; ++i) { \
1402 if ((void*)sym > elf->data_end) { \
1403 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1404 goto break_out; \
1405 } \
309 if (sym->st_name) { \ 1406 if (sym->st_name) { \
1407 /* make sure the symbol name is in acceptable memory range */ \
310 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 1408 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
311 if (*find_sym == '*') { \ 1409 if ((void*)symname > elf->data_end) { \
312 printf("%s(%s) %5lX %15s %s\n", \ 1410 warnf("%s: corrupt ELF symbols", elf->filename); \
313 ((*found_sym == 0) ? "\n\t" : "\t"), \ 1411 ++sym; \
314 (char *)basename(filename), \ 1412 continue; \
315 (long)sym->st_size, \ 1413 } \
316 (char *)get_elfstttype(sym->st_info), \ 1414 scanelf_match_symname(elf, found_sym, \
317 symname); \ 1415 &ret, &ret_len, symname, \
318 *found_sym = 1; \ 1416 ELF##B##_ST_TYPE(EGET(sym->st_info)), \
319 } else if ((strcmp(find_sym, symname) == 0) || \ 1417 ELF##B##_ST_BIND(EGET(sym->st_info)), \
320 (strcmp(symname, versioned_symname) == 0)) \ 1418 ELF##B##_ST_VISIBILITY(EGET(sym->st_other)), \
321 (*found_sym)++; \ 1419 EGET(sym->st_shndx), \
1420 /* st_size can be 64bit, but no one is really that big, so screw em */ \
1421 EGET(sym->st_size)); \
322 } \ 1422 } \
323 ++sym; \ 1423 ++sym; \
324 } } 1424 } \
1425 }
325 FIND_SYM(32) 1426 FIND_SYM(32)
326 FIND_SYM(64) 1427 FIND_SYM(64)
327 } 1428 }
1429
1430break_out:
1431 if (be_wewy_wewy_quiet) return NULL;
1432
328 if (*find_sym != '*' && *found_sym) 1433 if (*find_sym != '*' && *found_sym)
329 return find_sym; 1434 return ret;
330 if (be_quiet) 1435 if (be_quiet)
331 return NULL; 1436 return NULL;
332 else 1437 else
333 return " - "; 1438 return " - ";
334} 1439}
1440
1441static const char *scanelf_file_sections(elfobj *elf, char *found_section)
1442{
1443 if (!find_section)
1444 return NULL;
1445
1446#define FIND_SECTION(B) \
1447 if (elf->elf_class == ELFCLASS ## B) { \
1448 size_t matched, n; \
1449 int invert; \
1450 const char *section_name; \
1451 Elf ## B ## _Shdr *section; \
1452 \
1453 matched = 0; \
1454 array_for_each(find_section_arr, n, section_name) { \
1455 invert = (*section_name == '!' ? 1 : 0); \
1456 section = SHDR ## B (elf_findsecbyname(elf, section_name + invert)); \
1457 if ((section == NULL && invert) || (section != NULL && !invert)) \
1458 ++matched; \
1459 } \
1460 \
1461 if (matched == array_cnt(find_section_arr)) \
1462 *found_section = 1; \
1463 }
1464 FIND_SECTION(32)
1465 FIND_SECTION(64)
1466
1467 if (be_wewy_wewy_quiet)
1468 return NULL;
1469
1470 if (*found_section)
1471 return find_section;
1472
1473 if (be_quiet)
1474 return NULL;
1475 else
1476 return " - ";
1477}
1478
335/* scan an elf file and show all the fun stuff */ 1479/* scan an elf file and show all the fun stuff */
336#define prints(str) fputs(str, stdout) 1480#define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
337static void scanelf_file(const char *filename) 1481static int scanelf_elfobj(elfobj *elf)
338{ 1482{
339 unsigned long i; 1483 unsigned long i;
340 char found_pax, found_stack, found_relro, found_textrel, 1484 char found_pax, found_phdr, found_relro, found_load, found_textrel,
341 found_rpath, found_needed, found_interp, found_sym, 1485 found_rpath, found_needed, found_interp, found_bind, found_soname,
342 found_file; 1486 found_sym, found_lib, found_file, found_textrels, found_section;
343 elfobj *elf;
344 struct stat st;
345 static char *out_buffer = NULL; 1487 static char *out_buffer = NULL;
346 static size_t out_len; 1488 static size_t out_len;
347 1489
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 = \ 1490 found_pax = found_phdr = found_relro = found_load = found_textrel = \
360 found_rpath = found_needed = found_interp = found_sym = \ 1491 found_rpath = found_needed = found_interp = found_bind = found_soname = \
361 found_file = 0; 1492 found_sym = found_lib = found_file = found_textrels = found_section = 0;
362 1493
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) 1494 if (be_verbose > 2)
370 printf("%s: scanning file {%s,%s}\n", filename, 1495 printf("%s: scanning file {%s,%s}\n", elf->filename,
371 get_elfeitype(elf, EI_CLASS, elf->elf_class), 1496 get_elfeitype(EI_CLASS, elf->elf_class),
372 get_elfeitype(elf, EI_DATA, elf->data[EI_DATA])); 1497 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
373 else if (be_verbose) 1498 else if (be_verbose > 1)
374 printf("%s: scanning file\n", filename); 1499 printf("%s: scanning file\n", elf->filename);
375 1500
376 /* init output buffer */ 1501 /* init output buffer */
377 if (!out_buffer) { 1502 if (!out_buffer) {
378 out_len = sizeof(char) * 80; 1503 out_len = sizeof(char) * 80;
379 out_buffer = (char*)xmalloc(out_len); 1504 out_buffer = xmalloc(out_len);
380 } 1505 }
381 *out_buffer = '\0'; 1506 *out_buffer = '\0';
382 1507
383 /* show the header */ 1508 /* show the header */
384 if (!be_quiet && show_banner) { 1509 if (!be_quiet && show_banner) {
385 for (i=0; out_format[i]; ++i) { 1510 for (i = 0; out_format[i]; ++i) {
386 if (out_format[i] != '%') continue; 1511 if (!IS_MODIFIER(out_format[i])) continue;
387 1512
388 switch (out_format[++i]) { 1513 switch (out_format[++i]) {
1514 case '+': break;
389 case '%': break; 1515 case '%': break;
1516 case '#': break;
1517 case 'F':
1518 case 'p':
390 case 'F': prints("FILE "); break; 1519 case 'f': prints("FILE "); found_file = 1; break;
391 case 'o': prints(" TYPE "); break; 1520 case 'o': prints(" TYPE "); break;
392 case 'x': prints(" PAX "); break; 1521 case 'x': prints(" PAX "); break;
393 case 'e': prints("STK/REL "); break; 1522 case 'e': prints("STK/REL/PTL "); break;
394 case 't': prints("TEXTREL "); break; 1523 case 't': prints("TEXTREL "); break;
395 case 'r': prints("RPATH "); break; 1524 case 'r': prints("RPATH "); break;
1525 case 'M': prints("CLASS "); break;
1526 case 'l':
396 case 'n': prints("NEEDED "); break; 1527 case 'n': prints("NEEDED "); break;
397 case 'i': prints("INTERP "); break; 1528 case 'i': prints("INTERP "); break;
1529 case 'b': prints("BIND "); break;
1530 case 'Z': prints("SIZE "); break;
1531 case 'S': prints("SONAME "); break;
398 case 's': prints("SYM "); break; 1532 case 's': prints("SYM "); break;
1533 case 'N': prints("LIB "); break;
1534 case 'T': prints("TEXTRELS "); break;
1535 case 'k': prints("SECTION "); break;
1536 case 'a': prints("ARCH "); break;
1537 case 'I': prints("OSABI "); break;
1538 case 'Y': prints("EABI "); break;
1539 case 'O': prints("PERM "); break;
1540 case 'D': prints("ENDIAN "); break;
1541 default: warnf("'%c' has no title ?", out_format[i]);
399 } 1542 }
400 } 1543 }
1544 if (!found_file) prints("FILE ");
401 prints("\n"); 1545 prints("\n");
1546 found_file = 0;
402 show_banner = 0; 1547 show_banner = 0;
403 } 1548 }
404 1549
405 /* dump all the good stuff */ 1550 /* dump all the good stuff */
406 for (i=0; out_format[i]; ++i) { 1551 for (i = 0; out_format[i]; ++i) {
407 const char *out; 1552 const char *out;
408 1553 const char *tmp;
409 /* make sure we trim leading spaces in quiet mode */ 1554 static char ubuf[sizeof(unsigned long)*2];
410 if (be_quiet && *out_buffer == ' ' && !out_buffer[1]) 1555 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); 1556 xchrcat(&out_buffer, out_format[i], &out_len);
415 continue; 1557 continue;
416 } 1558 }
417 1559
418 out = NULL; 1560 out = NULL;
1561 be_wewy_wewy_quiet = (out_format[i] == '#');
1562 be_semi_verbose = (out_format[i] == '+');
419 switch (out_format[++i]) { 1563 switch (out_format[++i]) {
1564 case '+':
1565 case '%':
1566 case '#':
420 case '%': xchrcat(&out_buffer, '%', &out_len); break; 1567 xchrcat(&out_buffer, out_format[i], &out_len); break;
421 case 'F': found_file = 1; xstrcat(&out_buffer, filename, &out_len); break; 1568 case 'F':
1569 found_file = 1;
1570 if (be_wewy_wewy_quiet) break;
1571 xstrcat(&out_buffer, elf->filename, &out_len);
1572 break;
1573 case 'p':
1574 found_file = 1;
1575 if (be_wewy_wewy_quiet) break;
1576 tmp = elf->filename;
1577 if (search_path) {
1578 ssize_t len_search = strlen(search_path);
1579 ssize_t len_file = strlen(elf->filename);
1580 if (!strncmp(elf->filename, search_path, len_search) && \
1581 len_file > len_search)
1582 tmp += len_search;
1583 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1584 }
1585 xstrcat(&out_buffer, tmp, &out_len);
1586 break;
1587 case 'f':
1588 found_file = 1;
1589 if (be_wewy_wewy_quiet) break;
1590 tmp = strrchr(elf->filename, '/');
1591 tmp = (tmp == NULL ? elf->filename : tmp+1);
1592 xstrcat(&out_buffer, tmp, &out_len);
1593 break;
422 case 'o': out = get_elfetype(elf); break; 1594 case 'o': out = get_elfetype(elf); break;
423 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1595 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
424 case 'e': out = scanelf_file_stack(elf, &found_stack, &found_relro); break; 1596 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; 1597 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1598 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; 1599 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1600 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1601 case 'D': out = get_endian(elf); break;
1602 case 'O': out = strfileperms(elf->filename); break;
1603 case 'n':
427 case 'n': scanelf_file_needed(elf, &found_needed, &out_buffer, &out_len); break; 1604 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; 1605 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1606 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1607 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
429 case 's': out = scanelf_file_sym(elf, &found_sym, filename); break; 1608 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1609 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1610 case 'a': out = get_elfemtype(elf); break;
1611 case 'I': out = get_elfosabi(elf); break;
1612 case 'Y': out = get_elf_eabi(elf); break;
1613 case 'Z': snprintf(ubuf, sizeof(ubuf), "%lu", (unsigned long)elf->len); out = ubuf; break;;
1614 default: warnf("'%c' has no scan code?", out_format[i]);
430 } 1615 }
1616 if (out)
431 if (out) xstrcat(&out_buffer, out, &out_len); 1617 xstrcat(&out_buffer, out, &out_len);
432 } 1618 }
433 1619
434 if (!found_file) { 1620#define FOUND_SOMETHING() \
435 if (!be_quiet || found_pax || found_stack || found_textrel || \ 1621 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
436 found_rpath || found_needed || found_interp || found_sym) 1622 found_rpath || found_needed || found_interp || found_bind || \
1623 found_soname || found_sym || found_lib || found_textrels || found_section )
1624
1625 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1626 xchrcat(&out_buffer, ' ', &out_len);
437 xstrcat(&out_buffer, filename, &out_len); 1627 xstrcat(&out_buffer, elf->filename, &out_len);
438 } 1628 }
439 if (!(be_quiet && xemptybuffer(out_buffer))) 1629 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
440 puts(out_buffer); 1630 puts(out_buffer);
1631 fflush(stdout);
1632 }
441 1633
1634 return 0;
1635}
1636
1637/* scan a single elf */
1638static int scanelf_elf(const char *filename, int fd, size_t len)
1639{
1640 int ret = 1;
1641 size_t n;
1642 const char *match_etype;
1643 elfobj *elf;
1644
1645 /* Verify this is a real ELF */
1646 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1647 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1648 return 2;
1649 }
1650
1651 /* Possibly filter based on ELF bitness */
1652 switch (match_bits) {
1653 case 32:
1654 if (elf->elf_class != ELFCLASS32)
1655 goto done;
1656 break;
1657 case 64:
1658 if (elf->elf_class != ELFCLASS64)
1659 goto done;
1660 break;
1661 }
1662
1663 /* Possibly filter based on the ELF's e_type field */
1664 array_for_each(match_etypes, n, match_etype)
1665 if (etype_lookup(match_etype) == get_etype(elf))
1666 goto scanit;
1667 if (array_cnt(match_etypes))
1668 goto done;
1669
1670 scanit:
1671 ret = scanelf_elfobj(elf);
1672
1673 done:
442 unreadelf(elf); 1674 unreadelf(elf);
1675 return ret;
1676}
1677
1678/* scan an archive of elfs */
1679static int scanelf_archive(const char *filename, int fd, size_t len)
1680{
1681 archive_handle *ar;
1682 archive_member *m;
1683 char *ar_buffer;
1684 elfobj *elf;
1685
1686 ar = ar_open_fd(filename, fd);
1687 if (ar == NULL)
1688 return 1;
1689
1690 ar_buffer = mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1691 while ((m = ar_next(ar)) != NULL) {
1692 off_t cur_pos = lseek(fd, 0, SEEK_CUR);
1693 if (cur_pos == -1)
1694 errp("lseek() failed");
1695 elf = readelf_buffer(m->name, ar_buffer + cur_pos, m->size);
1696 if (elf) {
1697 scanelf_elfobj(elf);
1698 unreadelf(elf);
1699 }
1700 }
1701 munmap(ar_buffer, len);
1702
1703 return 0;
1704}
1705/* scan a file which may be an elf or an archive or some other magical beast */
1706static int scanelf_fileat(int dir_fd, const char *filename, const struct stat *st_cache)
1707{
1708 const struct stat *st = st_cache;
1709 struct stat symlink_st;
1710 int fd;
1711
1712 /* always handle regular files and handle symlinked files if no -y */
1713 if (S_ISLNK(st->st_mode)) {
1714 if (!scan_symlink)
1715 return 1;
1716 fstatat(dir_fd, filename, &symlink_st, 0);
1717 st = &symlink_st;
1718 }
1719
1720 if (!S_ISREG(st->st_mode)) {
1721 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1722 return 1;
1723 }
1724
1725 if (match_perms) {
1726 if ((st->st_mode | match_perms) != st->st_mode)
1727 return 1;
1728 }
1729 fd = openat(dir_fd, filename, (fix_elf ? O_RDWR : O_RDONLY) | O_CLOEXEC);
1730 if (fd == -1) {
1731 if (fix_elf && errno == ETXTBSY)
1732 warnp("%s: could not fix", filename);
1733 else if (be_verbose > 2)
1734 printf("%s: skipping file: %s\n", filename, strerror(errno));
1735 return 1;
1736 }
1737
1738 if (scanelf_elf(filename, fd, st->st_size) == 2) {
1739 /* if it isn't an ELF, maybe it's an .a archive */
1740 if (scan_archives)
1741 scanelf_archive(filename, fd, st->st_size);
1742
1743 /*
1744 * unreadelf() implicitly closes its fd, so only close it
1745 * when we are returning it in the non-ELF case
1746 */
1747 close(fd);
1748 }
1749
1750 return 0;
443} 1751}
444 1752
445/* scan a directory for ET_EXEC files and print when we find one */ 1753/* scan a directory for ET_EXEC files and print when we find one */
446static void scanelf_dir(const char *path) 1754static int scanelf_dirat(int dir_fd, const char *path)
447{ 1755{
448 register DIR *dir; 1756 register DIR *dir;
449 register struct dirent *dentry; 1757 register struct dirent *dentry;
450 struct stat st_top, st; 1758 struct stat st_top, st;
451 char buf[_POSIX_PATH_MAX]; 1759 char buf[__PAX_UTILS_PATH_MAX], *subpath;
452 size_t pathlen = 0, len = 0; 1760 size_t pathlen = 0, len = 0;
1761 int ret = 0;
1762 int subdir_fd;
453 1763
454 /* make sure path exists */ 1764 /* make sure path exists */
455 if (lstat(path, &st_top) == -1) { 1765 if (fstatat(dir_fd, path, &st_top, AT_SYMLINK_NOFOLLOW) == -1) {
456 if (be_verbose > 2) printf("%s: does not exist\n", path); 1766 if (be_verbose > 2) printf("%s: does not exist\n", path);
457 return; 1767 return 1;
458 } 1768 }
459 1769
460 /* ok, if it isn't a directory, assume we can open it */ 1770 /* ok, if it isn't a directory, assume we can open it */
461 if (!S_ISDIR(st_top.st_mode)) { 1771 if (!S_ISDIR(st_top.st_mode))
462 scanelf_file(path); 1772 return scanelf_fileat(dir_fd, path, &st_top);
463 return;
464 }
465 1773
466 /* now scan the dir looking for fun stuff */ 1774 /* now scan the dir looking for fun stuff */
467 if ((dir = opendir(path)) == NULL) { 1775 subdir_fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
468 warnf("could not opendir %s: %s", path, strerror(errno)); 1776 if (subdir_fd == -1)
1777 dir = NULL;
1778 else
1779 dir = fdopendir(subdir_fd);
1780 if (dir == NULL) {
1781 if (subdir_fd != -1)
1782 close(subdir_fd);
1783 else if (be_verbose > 2)
1784 printf("%s: skipping dir: %s\n", path, strerror(errno));
469 return; 1785 return 1;
470 } 1786 }
471 if (be_verbose) printf("%s: scanning dir\n", path); 1787 if (be_verbose > 1) printf("%s: scanning dir\n", path);
472 1788
473 pathlen = strlen(path); 1789 subpath = stpcpy(buf, path);
1790 if (subpath[-1] != '/')
1791 *subpath++ = '/';
1792 pathlen = subpath - buf;
474 while ((dentry = readdir(dir))) { 1793 while ((dentry = readdir(dir))) {
475 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1794 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
476 continue; 1795 continue;
1796
1797 if (fstatat(subdir_fd, dentry->d_name, &st, AT_SYMLINK_NOFOLLOW) == -1)
1798 continue;
1799
477 len = (pathlen + 1 + strlen(dentry->d_name) + 1); 1800 len = strlen(dentry->d_name);
478 if (len >= sizeof(buf)) { 1801 if (len + pathlen + 1 >= sizeof(buf)) {
479 warnf("Skipping '%s': len > sizeof(buf); %d > %d\n", path, (int)len, (int)sizeof(buf)); 1802 warnf("Skipping '%s%s': len > sizeof(buf); %zu > %zu\n",
1803 path, dentry->d_name, len + pathlen + 1, sizeof(buf));
480 continue; 1804 continue;
481 } 1805 }
482 sprintf(buf, "%s/%s", path, dentry->d_name); 1806 memcpy(subpath, dentry->d_name, len);
483 if (lstat(buf, &st) != -1) { 1807 subpath[len] = '\0';
1808
484 if (S_ISREG(st.st_mode)) 1809 if (S_ISREG(st.st_mode))
485 scanelf_file(buf); 1810 ret = scanelf_fileat(dir_fd, buf, &st);
486 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1811 else if (dir_recurse && S_ISDIR(st.st_mode)) {
487 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1812 if (dir_crossmount || (st_top.st_dev == st.st_dev))
488 scanelf_dir(buf); 1813 ret = scanelf_dirat(dir_fd, buf);
1814 }
1815 }
1816 closedir(dir);
1817
1818 return ret;
1819}
1820static int scanelf_dir(const char *path)
1821{
1822 return scanelf_dirat(root_fd, root_rel_path(path));
1823}
1824
1825static int scanelf_from_file(const char *filename)
1826{
1827 FILE *fp;
1828 char *p, *path;
1829 size_t len;
1830 int ret;
1831
1832 if (strcmp(filename, "-") == 0)
1833 fp = stdin;
1834 else if ((fp = fopen(filename, "r")) == NULL)
1835 return 1;
1836
1837 path = NULL;
1838 len = 0;
1839 ret = 0;
1840 while (getline(&path, &len, fp) != -1) {
1841 if ((p = strchr(path, '\n')) != NULL)
1842 *p = 0;
1843 search_path = path;
1844 ret = scanelf_dir(path);
1845 }
1846 free(path);
1847
1848 if (fp != stdin)
1849 fclose(fp);
1850
1851 return ret;
1852}
1853
1854#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1855
1856static int _load_ld_cache_config(const char *fname)
1857{
1858 FILE *fp = NULL;
1859 char *p, *path;
1860 size_t len;
1861 int curr_fd = -1;
1862
1863 fp = fopenat_r(root_fd, root_rel_path(fname));
1864 if (fp == NULL)
1865 return -1;
1866
1867 path = NULL;
1868 len = 0;
1869 while (getline(&path, &len, fp) != -1) {
1870 if ((p = strrchr(path, '\r')) != NULL)
1871 *p = 0;
1872 if ((p = strchr(path, '\n')) != NULL)
1873 *p = 0;
1874
1875 /* recursive includes of the same file will make this segfault. */
1876 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1877 glob_t gl;
1878 size_t x;
1879 const char *gpath;
1880
1881 /* re-use existing path buffer ... need to be creative */
1882 if (path[8] != '/')
1883 gpath = memcpy(path + 3, "/etc/", 5);
1884 else
1885 gpath = path + 8;
1886 if (root_fd != AT_FDCWD) {
1887 if (curr_fd == -1) {
1888 curr_fd = open(".", O_RDONLY|O_CLOEXEC);
1889 if (fchdir(root_fd))
1890 errp("unable to change to root dir");
1891 }
1892 gpath = root_rel_path(gpath);
489 } 1893 }
1894
1895 if (glob(gpath, 0, NULL, &gl) == 0) {
1896 for (x = 0; x < gl.gl_pathc; ++x) {
1897 /* try to avoid direct loops */
1898 if (strcmp(gl.gl_pathv[x], fname) == 0)
1899 continue;
1900 _load_ld_cache_config(gl.gl_pathv[x]);
1901 }
1902 globfree(&gl);
1903 }
1904
1905 /* failed globs are ignored by glibc */
1906 continue;
490 } 1907 }
1908
1909 if (*path != '/')
1910 continue;
1911
1912 xarraypush_str(ldpaths, path);
491 } 1913 }
492 closedir(dir); 1914 free(path);
1915
1916 fclose(fp);
1917
1918 if (curr_fd != -1) {
1919 if (fchdir(curr_fd))
1920 {/* don't care */}
1921 close(curr_fd);
1922 }
1923
1924 return 0;
1925}
1926
1927#elif defined(__FreeBSD__) || defined(__DragonFly__)
1928
1929static int _load_ld_cache_config(const char *fname)
1930{
1931 FILE *fp = NULL;
1932 char *b = NULL, *p;
1933 struct elfhints_hdr hdr;
1934
1935 fp = fopenat_r(root_fd, root_rel_path(fname));
1936 if (fp == NULL)
1937 return -1;
1938
1939 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1940 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1941 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1942 {
1943 fclose(fp);
1944 return -1;
1945 }
1946
1947 b = xmalloc(hdr.dirlistlen + 1);
1948 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1949 fclose(fp);
1950 free(b);
1951 return -1;
1952 }
1953
1954 while ((p = strsep(&b, ":"))) {
1955 if (*p == '\0')
1956 continue;
1957 xarraypush_str(ldpaths, p);
1958 }
1959
1960 free(b);
1961 fclose(fp);
1962 return 0;
1963}
1964
1965#else
1966#ifdef __ELF__
1967#warning Cache config support not implemented for your target
1968#endif
1969static int _load_ld_cache_config(const char *fname)
1970{
1971 return 0;
1972}
1973#endif
1974
1975static void load_ld_cache_config(const char *fname)
1976{
1977 bool scan_l, scan_ul, scan_ull;
1978 size_t n;
1979 const char *ldpath;
1980
1981 _load_ld_cache_config(fname);
1982
1983 scan_l = scan_ul = scan_ull = false;
1984 array_for_each(ldpaths, n, ldpath) {
1985 if (!scan_l && !strcmp(ldpath, "/lib")) scan_l = true;
1986 if (!scan_ul && !strcmp(ldpath, "/usr/lib")) scan_ul = true;
1987 if (!scan_ull && !strcmp(ldpath, "/usr/local/lib")) scan_ull = true;
1988 }
1989
1990 if (!scan_l) xarraypush_str(ldpaths, "/lib");
1991 if (!scan_ul) xarraypush_str(ldpaths, "/usr/lib");
1992 if (!scan_ull) xarraypush_str(ldpaths, "/usr/local/lib");
493} 1993}
494 1994
495/* scan /etc/ld.so.conf for paths */ 1995/* scan /etc/ld.so.conf for paths */
496static void scanelf_ldpath() 1996static void scanelf_ldpath(void)
497{ 1997{
498 char scan_l, scan_ul, scan_ull; 1998 size_t n;
499 char *path, *p; 1999 const char *ldpath;
500 FILE *fp;
501 2000
502 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 2001 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); 2002 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} 2003}
526 2004
527/* scan env PATH for paths */ 2005/* scan env PATH for paths */
528static void scanelf_envpath() 2006static void scanelf_envpath(void)
529{ 2007{
530 char *path, *p; 2008 char *path, *p;
531 2009
532 path = getenv("PATH"); 2010 path = getenv("PATH");
533 if (!path) 2011 if (!path)
540 } 2018 }
541 2019
542 free(path); 2020 free(path);
543} 2021}
544 2022
545 2023/* 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" 2024#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZCBhV"
549#define a_argument required_argument 2025#define a_argument required_argument
550static struct option const long_opts[] = { 2026static struct option const long_opts[] = {
551 {"path", no_argument, NULL, 'p'}, 2027 {"path", no_argument, NULL, 'p'},
552 {"ldpath", no_argument, NULL, 'l'}, 2028 {"ldpath", no_argument, NULL, 'l'},
2029 {"use-ldpath",no_argument, NULL, 129},
2030 {"root", a_argument, NULL, 128},
553 {"recursive", no_argument, NULL, 'R'}, 2031 {"recursive", no_argument, NULL, 'R'},
554 {"mount", no_argument, NULL, 'm'}, 2032 {"mount", no_argument, NULL, 'm'},
555 {"symlink", no_argument, NULL, 'y'}, 2033 {"symlink", no_argument, NULL, 'y'},
2034 {"archives", no_argument, NULL, 'A'},
2035 {"ldcache", no_argument, NULL, 'L'},
2036 {"fix", no_argument, NULL, 'X'},
2037 {"setpax", a_argument, NULL, 'z'},
556 {"pax", no_argument, NULL, 'x'}, 2038 {"pax", no_argument, NULL, 'x'},
557 {"header", no_argument, NULL, 'e'}, 2039 {"header", no_argument, NULL, 'e'},
558 {"textrel", no_argument, NULL, 't'}, 2040 {"textrel", no_argument, NULL, 't'},
559 {"rpath", no_argument, NULL, 'r'}, 2041 {"rpath", no_argument, NULL, 'r'},
560 {"needed", no_argument, NULL, 'n'}, 2042 {"needed", no_argument, NULL, 'n'},
561 {"interp", no_argument, NULL, 'i'}, 2043 {"interp", no_argument, NULL, 'i'},
2044 {"bind", no_argument, NULL, 'b'},
2045 {"soname", no_argument, NULL, 'S'},
562 {"symbol", a_argument, NULL, 's'}, 2046 {"symbol", a_argument, NULL, 's'},
2047 {"section", a_argument, NULL, 'k'},
2048 {"lib", a_argument, NULL, 'N'},
2049 {"gmatch", no_argument, NULL, 'g'},
2050 {"textrels", no_argument, NULL, 'T'},
2051 {"etype", a_argument, NULL, 'E'},
2052 {"bits", a_argument, NULL, 'M'},
2053 {"endian", no_argument, NULL, 'D'},
2054 {"osabi", no_argument, NULL, 'I'},
2055 {"eabi", no_argument, NULL, 'Y'},
2056 {"perms", a_argument, NULL, 'O'},
2057 {"size", no_argument, NULL, 'Z'},
563 {"all", no_argument, NULL, 'a'}, 2058 {"all", no_argument, NULL, 'a'},
564 {"quiet", no_argument, NULL, 'q'}, 2059 {"quiet", no_argument, NULL, 'q'},
565 {"verbose", no_argument, NULL, 'v'}, 2060 {"verbose", no_argument, NULL, 'v'},
566 {"format", a_argument, NULL, 'F'}, 2061 {"format", a_argument, NULL, 'F'},
2062 {"from", a_argument, NULL, 'f'},
567 {"file", a_argument, NULL, 'o'}, 2063 {"file", a_argument, NULL, 'o'},
2064 {"nocolor", no_argument, NULL, 'C'},
568 {"nobanner", no_argument, NULL, 'B'}, 2065 {"nobanner", no_argument, NULL, 'B'},
569 {"help", no_argument, NULL, 'h'}, 2066 {"help", no_argument, NULL, 'h'},
570 {"version", no_argument, NULL, 'V'}, 2067 {"version", no_argument, NULL, 'V'},
571 {NULL, no_argument, NULL, 0x0} 2068 {NULL, no_argument, NULL, 0x0}
572}; 2069};
2070
573static char *opts_help[] = { 2071static const char * const opts_help[] = {
574 "Scan all directories in PATH environment", 2072 "Scan all directories in PATH environment",
575 "Scan all directories in /etc/ld.so.conf", 2073 "Scan all directories in /etc/ld.so.conf",
2074 "Use ld.so.conf to show full path (use with -r/-n)",
2075 "Root directory (use with -l or -p)",
576 "Scan directories recursively", 2076 "Scan directories recursively",
577 "Don't recursively cross mount points", 2077 "Don't recursively cross mount points",
578 "Don't scan symlinks\n", 2078 "Don't scan symlinks",
2079 "Scan archives (.a files)",
2080 "Utilize ld.so.cache to show full path (use with -r/-n)",
2081 "Try and 'fix' bad things (use with -r/-e)",
2082 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
579 "Print PaX markings", 2083 "Print PaX markings",
580 "Print GNU_STACK markings", 2084 "Print GNU_STACK/PT_LOAD markings",
581 "Print TEXTREL information", 2085 "Print TEXTREL information",
582 "Print RPATH information", 2086 "Print RPATH information",
583 "Print NEEDED information", 2087 "Print NEEDED information",
584 "Print INTERP information", 2088 "Print INTERP information",
2089 "Print BIND information",
2090 "Print SONAME information",
585 "Find a specified symbol", 2091 "Find a specified symbol",
586 "Print all scanned info (-x -e -t -r)\n", 2092 "Find a specified section",
2093 "Find a specified library",
2094 "Use regex rather than string compare (with -s); specify twice for case insensitive",
2095 "Locate cause of TEXTREL",
2096 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
2097 "Print only ELF files matching numeric bits",
2098 "Print Endianness",
2099 "Print OSABI",
2100 "Print EABI (EM_ARM Only)",
2101 "Print only ELF files matching octal permissions",
2102 "Print ELF file size",
2103 "Print all useful/simple info\n",
587 "Only output 'bad' things", 2104 "Only output 'bad' things",
588 "Be verbose (can be specified more than once)", 2105 "Be verbose (can be specified more than once)",
589 "Use specified format for output", 2106 "Use specified format for output",
2107 "Read input stream from a filename",
590 "Write output stream to a filename", 2108 "Write output stream to a filename",
2109 "Don't emit color in output",
591 "Don't display the header", 2110 "Don't display the header",
592 "Print this help and exit", 2111 "Print this help and exit",
593 "Print version and exit", 2112 "Print version and exit",
594 NULL 2113 NULL
595}; 2114};
596 2115
597/* display usage and exit */ 2116/* display usage and exit */
598static void usage(int status) 2117static void usage(int status)
599{ 2118{
600 unsigned long i; 2119 const char a_arg[] = "<arg>";
2120 size_t a_arg_len = strlen(a_arg) + 2;
2121 size_t i;
2122 int optlen;
601 printf(" Scan ELF binaries for stuff\n\n" 2123 printf("* Scan ELF binaries for stuff\n\n"
602 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0); 2124 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
603 printf("Options: -[%s]\n", PARSE_FLAGS); 2125 printf("Options: -[%s]\n", PARSE_FLAGS);
2126
2127 /* prescan the --long opt length to auto-align */
2128 optlen = 0;
604 for (i = 0; long_opts[i].name; ++i) 2129 for (i = 0; long_opts[i].name; ++i) {
2130 int l = strlen(long_opts[i].name);
2131 if (long_opts[i].has_arg == a_argument)
2132 l += a_arg_len;
2133 optlen = max(l, optlen);
2134 }
2135
2136 for (i = 0; long_opts[i].name; ++i) {
2137 /* first output the short flag if it has one */
2138 if (long_opts[i].val > '~')
2139 printf(" ");
2140 else
2141 printf(" -%c, ", long_opts[i].val);
2142
2143 /* then the long flag */
605 if (long_opts[i].has_arg == no_argument) 2144 if (long_opts[i].has_arg == no_argument)
606 printf(" -%c, --%-13s %s\n", long_opts[i].val, 2145 printf("--%-*s", optlen, long_opts[i].name);
607 long_opts[i].name, opts_help[i]);
608 else 2146 else
609 printf(" -%c, --%-6s <arg> %s\n", long_opts[i].val, 2147 printf("--%s %s %*s", long_opts[i].name, a_arg,
610 long_opts[i].name, opts_help[i]); 2148 (int)(optlen - strlen(long_opts[i].name) - a_arg_len), "");
2149
2150 /* finally the help text */
2151 printf("* %s\n", opts_help[i]);
2152 }
2153
2154 puts("\nFor more information, see the scanelf(1) manpage");
611 exit(status); 2155 exit(status);
612} 2156}
613 2157
614/* parse command line arguments and preform needed actions */ 2158/* parse command line arguments and preform needed actions */
2159#define do_pax_state(option, flag) \
2160 if (islower(option)) { \
2161 flags &= ~PF_##flag; \
2162 flags |= PF_NO##flag; \
2163 } else { \
2164 flags &= ~PF_NO##flag; \
2165 flags |= PF_##flag; \
2166 }
2167static void parse_delimited(array_t *arr, char *arg, const char *delim)
2168{
2169 char *ele = strtok(arg, delim);
2170 if (!ele) /* edge case: -s '' */
2171 xarraypush_str(arr, "");
2172 while (ele) {
2173 xarraypush_str(arr, ele);
2174 ele = strtok(NULL, delim);
2175 }
2176}
615static void parseargs(int argc, char *argv[]) 2177static int parseargs(int argc, char *argv[])
616{ 2178{
617 int flag; 2179 int i;
2180 const char *from_file = NULL;
2181 int ret = 0;
2182 char load_cache_config = 0;
618 2183
619 opterr = 0; 2184 opterr = 0;
620 while ((flag=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 2185 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
621 switch (flag) { 2186 switch (i) {
622 2187
623 case 'V': 2188 case 'V':
624 printf("%s compiled %s\n%s\n" 2189 printf("pax-utils-%s: %s\n%s\n"
625 "%s written for Gentoo Linux by <solar and vapier @ gentoo.org>\n", 2190 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
626 __FILE__, __DATE__, rcsid, argv0); 2191 VERSION, __FILE__, rcsid, argv0);
627 exit(EXIT_SUCCESS); 2192 exit(EXIT_SUCCESS);
628 break; 2193 break;
629 case 'h': usage(EXIT_SUCCESS); break; 2194 case 'h': usage(EXIT_SUCCESS); break;
630 2195 case 'f':
2196 if (from_file) warn("You prob don't want to specify -f twice");
2197 from_file = optarg;
2198 break;
2199 case 'E':
2200 /* historically, this was comma delimited */
2201 parse_delimited(match_etypes, optarg, ",");
2202 break;
2203 case 'M':
2204 match_bits = atoi(optarg);
2205 if (match_bits == 0) {
2206 if (strcmp(optarg, "ELFCLASS32") == 0)
2207 match_bits = 32;
2208 if (strcmp(optarg, "ELFCLASS64") == 0)
2209 match_bits = 64;
2210 }
2211 break;
2212 case 'O':
2213 if (sscanf(optarg, "%o", &match_perms) == -1)
2214 match_bits = 0;
2215 break;
631 case 'o': { 2216 case 'o': {
632 FILE *fp = NULL;
633 fp = freopen(optarg, "w", stdout); 2217 if (freopen(optarg, "w", stdout) == NULL)
634 if (fp == NULL) 2218 errp("Could not freopen(%s)", optarg);
635 err("Could not open output stream '%s': %s", optarg, strerror(errno));
636 stdout = fp;
637 break; 2219 break;
638 } 2220 }
639 2221 case 'k':
2222 xarraypush_str(find_section_arr, optarg);
2223 break;
2224 case 's':
2225 /* historically, this was comma delimited */
2226 parse_delimited(find_sym_arr, optarg, ",");
2227 break;
2228 case 'N':
2229 xarraypush_str(find_lib_arr, optarg);
2230 break;
640 case 's': { 2231 case 'F': {
641 size_t len; 2232 if (out_format) warn("You prob don't want to specify -F twice");
642 find_sym = xstrdup(optarg); 2233 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; 2234 break;
647 } 2235 }
648
649 case 'F': { 2236 case 'z': {
650 out_format = strdup(optarg); 2237 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
2238 size_t x;
2239
2240 for (x = 0; x < strlen(optarg); x++) {
2241 switch (optarg[x]) {
2242 case 'p':
2243 case 'P':
2244 do_pax_state(optarg[x], PAGEEXEC);
2245 break;
2246 case 's':
2247 case 'S':
2248 do_pax_state(optarg[x], SEGMEXEC);
2249 break;
2250 case 'm':
2251 case 'M':
2252 do_pax_state(optarg[x], MPROTECT);
2253 break;
2254 case 'e':
2255 case 'E':
2256 do_pax_state(optarg[x], EMUTRAMP);
2257 break;
2258 case 'r':
2259 case 'R':
2260 do_pax_state(optarg[x], RANDMMAP);
2261 break;
2262 case 'x':
2263 case 'X':
2264 do_pax_state(optarg[x], RANDEXEC);
2265 break;
2266 default:
2267 break;
2268 }
2269 }
2270 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
2271 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
2272 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
2273 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
2274 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
2275 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
2276 setpax = flags;
651 break; 2277 break;
652 } 2278 }
653 2279 case 'Z': show_size = 1; break;
2280 case 'g': ++g_match; break;
2281 case 'L': load_cache_config = use_ldcache = 1; break;
654 case 'y': scan_symlink = 0; break; 2282 case 'y': scan_symlink = 0; break;
2283 case 'A': scan_archives = 1; break;
2284 case 'C': color_init(true); break;
655 case 'B': show_banner = 0; break; 2285 case 'B': show_banner = 0; break;
656 case 'l': scan_ldpath = 1; break; 2286 case 'l': load_cache_config = scan_ldpath = 1; break;
657 case 'p': scan_envpath = 1; break; 2287 case 'p': scan_envpath = 1; break;
658 case 'R': dir_recurse = 1; break; 2288 case 'R': dir_recurse = 1; break;
659 case 'm': dir_crossmount = 0; break; 2289 case 'm': dir_crossmount = 0; break;
2290 case 'X': ++fix_elf; break;
660 case 'x': show_pax = 1; break; 2291 case 'x': show_pax = 1; break;
661 case 'e': show_stack = 1; break; 2292 case 'e': show_phdr = 1; break;
662 case 't': show_textrel = 1; break; 2293 case 't': show_textrel = 1; break;
663 case 'r': show_rpath = 1; break; 2294 case 'r': show_rpath = 1; break;
664 case 'n': show_needed = 1; break; 2295 case 'n': show_needed = 1; break;
665 case 'i': show_interp = 1; break; 2296 case 'i': show_interp = 1; break;
666 case 'q': be_quiet = 1; break; 2297 case 'b': show_bind = 1; break;
2298 case 'S': show_soname = 1; break;
2299 case 'T': show_textrels = 1; break;
2300 case 'q': be_quiet = min(be_quiet, 20) + 1; break;
667 case 'v': be_verbose = (be_verbose % 20) + 1; break; 2301 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; 2302 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
669 2303 case 'D': show_endian = 1; break;
2304 case 'I': show_osabi = 1; break;
2305 case 'Y': show_eabi = 1; break;
2306 case 128:
2307 root_fd = open(optarg, O_RDONLY|O_CLOEXEC);
2308 if (root_fd == -1)
2309 err("Could not open root: %s", optarg);
2310 break;
2311 case 129: load_cache_config = use_ldpath = 1; break;
670 case ':': 2312 case ':':
671 warn("Option missing parameter\n"); 2313 err("Option '%c' is missing parameter", optopt);
672 usage(EXIT_FAILURE);
673 break;
674 case '?': 2314 case '?':
675 warn("Unknown option\n"); 2315 err("Unknown option '%c' or argument missing", optopt);
676 usage(EXIT_FAILURE);
677 break;
678 default: 2316 default:
679 err("Unhandled option '%c'", flag); 2317 err("Unhandled option '%c'; please report this", i);
680 break;
681 } 2318 }
682 } 2319 }
2320 if (show_textrels && be_verbose)
2321 objdump = which("objdump", "OBJDUMP");
2322 /* precompile all the regexes */
2323 if (g_match) {
2324 regex_t preg;
2325 const char *this_sym;
2326 size_t n;
2327 int flags = REG_EXTENDED | REG_NOSUB | (g_match > 1 ? REG_ICASE : 0);
683 2328
684 if (be_quiet && be_verbose) 2329 array_for_each(find_sym_arr, n, this_sym) {
685 err("You can be quiet or you can be verbose, not both, stupid"); 2330 /* see scanelf_match_symname for logic info */
2331 switch (this_sym[0]) {
2332 case '%':
2333 while (*(this_sym++))
2334 if (*this_sym == '%') {
2335 ++this_sym;
2336 break;
2337 }
2338 break;
2339 case '+':
2340 case '-':
2341 ++this_sym;
2342 break;
2343 }
2344 if (*this_sym == '*')
2345 ++this_sym;
686 2346
2347 ret = regcomp(&preg, this_sym, flags);
2348 if (ret) {
2349 char err[256];
2350 regerror(ret, &preg, err, sizeof(err));
2351 err("regcomp of %s failed: %s", this_sym, err);
2352 }
2353 xarraypush(find_sym_regex_arr, &preg, sizeof(preg));
2354 }
2355 }
2356 /* flatten arrays for display */
2357 find_sym = array_flatten_str(find_sym_arr);
2358 find_lib = array_flatten_str(find_lib_arr);
2359 find_section = array_flatten_str(find_section_arr);
687 /* let the format option override all other options */ 2360 /* let the format option override all other options */
688 if (out_format) { 2361 if (out_format) {
689 show_pax = show_stack = show_textrel = show_rpath = show_needed = show_interp = 0; 2362 show_pax = show_phdr = show_textrel = show_rpath = \
2363 show_needed = show_interp = show_bind = show_soname = \
2364 show_textrels = show_perms = show_endian = show_size = \
2365 show_osabi = show_eabi = 0;
690 for (flag=0; out_format[flag]; ++flag) { 2366 for (i = 0; out_format[i]; ++i) {
691 if (out_format[flag] != '%') continue; 2367 if (!IS_MODIFIER(out_format[i])) continue;
692 2368
693 switch (out_format[++flag]) { 2369 switch (out_format[++i]) {
2370 case '+': break;
694 case '%': break; 2371 case '%': break;
2372 case '#': break;
695 case 'F': break; 2373 case 'F': break;
2374 case 'p': break;
2375 case 'f': break;
2376 case 'k': break;
696 case 's': break; 2377 case 's': break;
2378 case 'N': break;
697 case 'o': break; 2379 case 'o': break;
2380 case 'a': break;
2381 case 'M': break;
2382 case 'Z': show_size = 1; break;
2383 case 'D': show_endian = 1; break;
2384 case 'I': show_osabi = 1; break;
2385 case 'Y': show_eabi = 1; break;
2386 case 'O': show_perms = 1; break;
698 case 'x': show_pax = 1; break; 2387 case 'x': show_pax = 1; break;
699 case 'e': show_stack = 1; break; 2388 case 'e': show_phdr = 1; break;
700 case 't': show_textrel = 1; break; 2389 case 't': show_textrel = 1; break;
701 case 'r': show_rpath = 1; break; 2390 case 'r': show_rpath = 1; break;
702 case 'n': show_needed = 1; break; 2391 case 'n': show_needed = 1; break;
703 case 'i': show_interp = 1; break; 2392 case 'i': show_interp = 1; break;
2393 case 'b': show_bind = 1; break;
2394 case 'S': show_soname = 1; break;
2395 case 'T': show_textrels = 1; break;
704 default: 2396 default:
705 err("Invalid format specifier '%c' (byte %i)", 2397 err("invalid format specifier '%c' (byte %i)",
706 out_format[flag], flag+1); 2398 out_format[i], i+1);
707 } 2399 }
708 } 2400 }
709 2401
710 /* construct our default format */ 2402 /* construct our default format */
711 } else { 2403 } else {
712 size_t fmt_len = 30; 2404 size_t fmt_len = 30;
713 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 2405 out_format = xmalloc(sizeof(char) * fmt_len);
2406 *out_format = '\0';
714 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 2407 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
715 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len); 2408 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
2409 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
2410 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
2411 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
716 if (show_stack) xstrcat(&out_format, "%e ", &fmt_len); 2412 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
2413 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
2414 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
717 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 2415 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
718 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 2416 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
719 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 2417 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
720 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 2418 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
2419 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
2420 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
2421 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
721 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len); 2422 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
2423 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
2424 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
722 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 2425 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
723 } 2426 }
724 if (be_verbose > 2) printf("Format: %s\n", out_format); 2427 if (be_verbose > 2) printf("Format: %s\n", out_format);
725 2428
726 /* now lets actually do the scanning */ 2429 /* now lets actually do the scanning */
2430 if (load_cache_config)
2431 load_ld_cache_config(__PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
727 if (scan_ldpath) scanelf_ldpath(); 2432 if (scan_ldpath) scanelf_ldpath();
728 if (scan_envpath) scanelf_envpath(); 2433 if (scan_envpath) scanelf_envpath();
2434 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
2435 from_file = "-";
2436 if (from_file) {
2437 scanelf_from_file(from_file);
2438 from_file = *argv;
2439 }
729 if (optind == argc && !scan_ldpath && !scan_envpath) 2440 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
730 err("Nothing to scan !?"); 2441 err("Nothing to scan !?");
731 while (optind < argc) 2442 while (optind < argc) {
732 scanelf_dir(argv[optind++]); 2443 search_path = argv[optind++];
2444 ret = scanelf_dir(search_path);
2445 }
733 2446
2447#ifdef __PAX_UTILS_CLEANUP
734 /* clean up */ 2448 /* clean up */
735 if (find_sym) { 2449 xarrayfree(ldpaths);
2450 xarrayfree(find_sym_arr);
2451 xarrayfree(find_lib_arr);
2452 xarrayfree(find_section_arr);
736 free(find_sym); 2453 free(find_sym);
737 free(versioned_symname); 2454 free(find_lib);
2455 free(find_section);
2456 {
2457 size_t n;
2458 regex_t *preg;
2459 array_for_each(find_sym_regex_arr, n, preg)
2460 regfree(preg);
2461 xarrayfree(find_sym_regex_arr);
738 } 2462 }
739 if (out_format) free(out_format);
740}
741 2463
2464 if (ldcache != 0)
2465 munmap(ldcache, ldcache_size);
2466#endif
742 2467
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; 2468 return ret;
750} 2469}
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 2470
761 new_len = strlen(*dst) + strlen(src); 2471static 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{ 2472{
773 static char my_app[2]; 2473 const char *delims = " \t\n";
774 my_app[0] = append; 2474 char **envvals = NULL;
775 my_app[1] = '\0'; 2475 char *env, *s;
776 xstrcat(dst, my_app, curr_len); 2476 int nentry;
777} 2477
778static int xemptybuffer(const char *buff) 2478 if ((env = getenv(envvar)) == NULL)
779{
780 long i;
781 for (i=0; buff[i]; ++i)
782 if (buff[i] != ' ')
783 return 0; 2479 return NULL;
2480
2481 env = xstrdup(env);
2482 if (env == NULL)
784 return 1; 2483 return NULL;
785}
786 2484
2485 s = strtok(env, delims);
2486 if (s == NULL) {
2487 free(env);
2488 return NULL;
2489 }
787 2490
2491 nentry = 0;
2492 while (s != NULL) {
2493 ++nentry;
2494 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
2495 envvals[nentry-1] = s;
2496 s = strtok(NULL, delims);
2497 }
2498 envvals[nentry] = NULL;
2499
2500 /* don't want to free(env) as it contains the memory that backs
2501 * the envvals array of strings */
2502 return envvals;
2503}
2504
2505static void parseenv(void)
2506{
2507 color_init(false);
2508 qa_textrels = get_split_env("QA_TEXTRELS");
2509 qa_execstack = get_split_env("QA_EXECSTACK");
2510 qa_wx_load = get_split_env("QA_WX_LOAD");
2511}
2512
2513#ifdef __PAX_UTILS_CLEANUP
2514static void cleanup(void)
2515{
2516 free(out_format);
2517 free(qa_textrels);
2518 free(qa_execstack);
2519 free(qa_wx_load);
2520}
2521#endif
788 2522
789int main(int argc, char *argv[]) 2523int main(int argc, char *argv[])
790{ 2524{
2525 int ret;
791 if (argc < 2) 2526 if (argc < 2)
792 usage(EXIT_FAILURE); 2527 usage(EXIT_FAILURE);
2528 parseenv();
793 parseargs(argc, argv); 2529 ret = parseargs(argc, argv);
794 fclose(stdout); 2530 fclose(stdout);
795 return EXIT_SUCCESS; 2531#ifdef __PAX_UTILS_CLEANUP
2532 cleanup();
2533 warn("The calls to add/delete heap should be off:\n"
2534 "\t- 1 due to the out_buffer not being freed in scanelf_fileat()\n"
2535 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
2536#endif
2537 return ret;
796} 2538}
2539
2540/* Match filename against entries in matchlist, return TRUE
2541 * if the file is listed */
2542static int file_matches_list(const char *filename, char **matchlist)
2543{
2544 char **file;
2545 char *match;
2546 char buf[__PAX_UTILS_PATH_MAX];
2547
2548 if (matchlist == NULL)
2549 return 0;
2550
2551 for (file = matchlist; *file != NULL; file++) {
2552 if (search_path) {
2553 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2554 match = buf;
2555 } else {
2556 match = *file;
2557 }
2558 if (fnmatch(match, filename, 0) == 0)
2559 return 1;
2560 }
2561 return 0;
2562}

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