/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.44 Revision 1.245
1/* 1/*
2 * Copyright 2003 Ned Ludd <solar@gentoo.org>
3 * Copyright 1999-2005 Gentoo Foundation 2 * Copyright 2003-2007 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 1.245 2012/08/04 06:08:25 vapier Exp $
6 * 5 *
7 ******************************************************************** 6 * Copyright 2003-2007 Ned Ludd - <solar@gentoo.org>
8 * This program is free software; you can redistribute it and/or 7 * Copyright 2004-2007 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 1.245 2012/08/04 06:08:25 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 char *match_etypes = NULL;
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 char *find_lib = NULL;
50static array_t _find_lib_arr = array_init_decl, *find_lib_arr = &_find_lib_arr;
51static char *find_section = NULL;
52static array_t _find_section_arr = array_init_decl, *find_section_arr = &_find_section_arr;
72static char *out_format = NULL; 53static char *out_format = NULL;
54static char *search_path = NULL;
55static char fix_elf = 0;
56static char g_match = 0;
57static char use_ldcache = 0;
58static char use_ldpath = 0;
73 59
60static char **qa_textrels = NULL;
61static char **qa_execstack = NULL;
62static char **qa_wx_load = NULL;
63static int root_fd = AT_FDCWD;
74 64
65static int match_bits = 0;
66static unsigned int match_perms = 0;
67static void *ldcache = NULL;
68static size_t ldcache_size = 0;
69static unsigned long setpax = 0UL;
75 70
71static int has_objdump = 0;
72
73/* find the path to a file by name */
74static int bin_in_path(const char *fname)
75{
76 char fullpath[__PAX_UTILS_PATH_MAX];
77 char *path, *p;
78
79 path = getenv("PATH");
80 if (!path)
81 return 0;
82
83 while ((p = strrchr(path, ':')) != NULL) {
84 snprintf(fullpath, sizeof(fullpath), "%s/%s", p + 1, fname);
85 *p = 0;
86 if (access(fullpath, R_OK) != -1)
87 return 1;
88 }
89
90 return 0;
91}
92
93static FILE *fopenat_r(int dir_fd, const char *path)
94{
95 int fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
96 if (fd == -1)
97 return NULL;
98 return fdopen(fd, "re");
99}
100
101static const char *root_rel_path(const char *path)
102{
103 /*
104 * openat() will ignore the dirfd if path starts with
105 * a /, so consume all of that noise
106 *
107 * XXX: we don't handle relative paths like ../ that
108 * break out of the --root option, but for now, just
109 * don't do that :P.
110 */
111 if (root_fd != AT_FDCWD) {
112 while (*path == '/')
113 ++path;
114 if (*path == '\0')
115 path = ".";
116 }
117
118 return path;
119}
120
121/* 1 on failure. 0 otherwise */
122static int rematch(const char *regex, const char *match, int cflags)
123{
124 regex_t preg;
125 int ret;
126
127 if ((match == NULL) || (regex == NULL))
128 return EXIT_FAILURE;
129
130 if ((ret = regcomp(&preg, regex, cflags))) {
131 char err[256];
132
133 if (regerror(ret, &preg, err, sizeof(err)))
134 fprintf(stderr, "regcomp failed: %s", err);
135 else
136 fprintf(stderr, "regcomp failed");
137
138 return EXIT_FAILURE;
139 }
140 ret = regexec(&preg, match, 0, NULL, 0);
141 regfree(&preg);
142
143 return ret;
144}
145
76/* sub-funcs for scanelf_file() */ 146/* sub-funcs for scanelf_fileat() */
147static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **str)
148{
149 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
150
151 /* debug sections */
152 void *symtab = elf_findsecbyname(elf, ".symtab");
153 void *strtab = elf_findsecbyname(elf, ".strtab");
154 /* runtime sections */
155 void *dynsym = elf_findsecbyname(elf, ".dynsym");
156 void *dynstr = elf_findsecbyname(elf, ".dynstr");
157
158 /*
159 * If the sections are marked NOBITS, then they don't exist, so we just
160 * skip them. This let's us work sanely with splitdebug ELFs (rather
161 * than spewing a lot of "corrupt ELF" messages later on). In malformed
162 * ELFs, the section might be wrongly set to NOBITS, but screw em.
163 */
164#define GET_SYMTABS(B) \
165 if (elf->elf_class == ELFCLASS ## B) { \
166 Elf ## B ## _Shdr *esymtab = symtab; \
167 Elf ## B ## _Shdr *estrtab = strtab; \
168 Elf ## B ## _Shdr *edynsym = dynsym; \
169 Elf ## B ## _Shdr *edynstr = dynstr; \
170 \
171 if (symtab && EGET(esymtab->sh_type) == SHT_NOBITS) \
172 symtab = NULL; \
173 if (dynsym && EGET(edynsym->sh_type) == SHT_NOBITS) \
174 dynsym = NULL; \
175 if (symtab && dynsym) \
176 *sym = (EGET(esymtab->sh_size) > EGET(edynsym->sh_size)) ? symtab : dynsym; \
177 else \
178 *sym = symtab ? symtab : dynsym; \
179 \
180 if (strtab && EGET(estrtab->sh_type) == SHT_NOBITS) \
181 strtab = NULL; \
182 if (dynstr && EGET(edynstr->sh_type) == SHT_NOBITS) \
183 dynstr = NULL; \
184 if (strtab && dynstr) \
185 *str = (EGET(estrtab->sh_size) > EGET(edynstr->sh_size)) ? strtab : dynstr; \
186 else \
187 *str = strtab ? strtab : dynstr; \
188 }
189 GET_SYMTABS(32)
190 GET_SYMTABS(64)
191
192 if (*sym && *str)
193 return;
194
195 /*
196 * damn, they're really going to make us work for it huh?
197 * reconstruct the section header info out of the dynamic
198 * tags so we can see what symbols this guy uses at runtime.
199 */
200#define GET_SYMTABS_DT(B) \
201 if (elf->elf_class == ELFCLASS ## B) { \
202 size_t i; \
203 static Elf ## B ## _Shdr sym_shdr, str_shdr; \
204 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
205 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
206 Elf ## B ## _Addr vsym, vstr, vhash, vgnu_hash; \
207 Elf ## B ## _Dyn *dyn; \
208 Elf ## B ## _Off offset; \
209 \
210 /* lookup symbols used at runtime with DT_SYMTAB / DT_STRTAB */ \
211 vsym = vstr = vhash = vgnu_hash = 0; \
212 memset(&sym_shdr, 0, sizeof(sym_shdr)); \
213 memset(&str_shdr, 0, sizeof(str_shdr)); \
214 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
215 if (EGET(phdr[i].p_type) != PT_DYNAMIC) \
216 continue; \
217 \
218 offset = EGET(phdr[i].p_offset); \
219 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
220 continue; \
221 \
222 dyn = DYN ## B (elf->vdata + offset); \
223 while (EGET(dyn->d_tag) != DT_NULL) { \
224 switch (EGET(dyn->d_tag)) { \
225 case DT_SYMTAB: vsym = EGET(dyn->d_un.d_val); break; \
226 case DT_SYMENT: sym_shdr.sh_entsize = dyn->d_un.d_val; break; \
227 case DT_STRTAB: vstr = EGET(dyn->d_un.d_val); break; \
228 case DT_STRSZ: str_shdr.sh_size = dyn->d_un.d_val; break; \
229 case DT_HASH: vhash = EGET(dyn->d_un.d_val); break; \
230 /*case DT_GNU_HASH: vgnu_hash = EGET(dyn->d_un.d_val); break;*/ \
231 } \
232 ++dyn; \
233 } \
234 if (vsym && vstr) \
235 break; \
236 } \
237 if (!vsym || !vstr || !(vhash || vgnu_hash)) \
238 return; \
239 \
240 /* calc offset into the ELF by finding the load addr of the syms */ \
241 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
242 Elf ## B ## _Addr vaddr = EGET(phdr[i].p_vaddr); \
243 Elf ## B ## _Addr filesz = EGET(phdr[i].p_filesz); \
244 offset = EGET(phdr[i].p_offset); \
245 \
246 if (EGET(phdr[i].p_type) != PT_LOAD) \
247 continue; \
248 \
249 if (vhash >= vaddr && vhash < vaddr + filesz) { \
250 /* Scan the hash table to see how many entries we have */ \
251 Elf32_Word max_sym_idx = 0; \
252 Elf32_Word *hashtbl = elf->vdata + offset + (vhash - vaddr); \
253 Elf32_Word b, nbuckets = EGET(hashtbl[0]); \
254 Elf32_Word nchains = EGET(hashtbl[1]); \
255 Elf32_Word *buckets = &hashtbl[2]; \
256 Elf32_Word *chains = &buckets[nbuckets]; \
257 Elf32_Word sym_idx; \
258 \
259 for (b = 0; b < nbuckets; ++b) { \
260 if (!buckets[b]) \
261 continue; \
262 for (sym_idx = buckets[b]; sym_idx < nchains && sym_idx; sym_idx = chains[sym_idx]) \
263 if (max_sym_idx < sym_idx) \
264 max_sym_idx = sym_idx; \
265 } \
266 ESET(sym_shdr.sh_size, sym_shdr.sh_entsize * max_sym_idx); \
267 } \
268 \
269 if (vsym >= vaddr && vsym < vaddr + filesz) { \
270 ESET(sym_shdr.sh_offset, offset + (vsym - vaddr)); \
271 *sym = &sym_shdr; \
272 } \
273 \
274 if (vstr >= vaddr && vstr < vaddr + filesz) { \
275 ESET(str_shdr.sh_offset, offset + (vstr - vaddr)); \
276 *str = &str_shdr; \
277 } \
278 } \
279 }
280 GET_SYMTABS_DT(32)
281 GET_SYMTABS_DT(64)
282}
283
77static char *scanelf_file_pax(elfobj *elf, char *found_pax) 284static char *scanelf_file_pax(elfobj *elf, char *found_pax)
78{ 285{
79 static char *paxflags; 286 static char ret[7];
287 unsigned long i, shown;
80 288
81 if (!show_pax) return NULL; 289 if (!show_pax) return NULL;
82 290
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; 291 shown = 0;
100 strcpy(ret, "--- ---"); 292 memset(&ret, 0, sizeof(ret));
101 293
102 if (elf->phdr) { 294 if (elf->phdr) {
103#define SHOW_STACK(B) \ 295#define SHOW_PAX(B) \
104 if (elf->elf_class == ELFCLASS ## B) { \ 296 if (elf->elf_class == ELFCLASS ## B) { \
105 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 297 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
106 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 298 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
107 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 299 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
108 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \ 300 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; \ 301 continue; \
116 if (be_quiet && !(EGET(phdr[i].p_flags) & PF_X)) \ 302 if (fix_elf && setpax) { \
303 /* set the paxctl flags */ \
304 ESET(phdr[i].p_flags, setpax); \
305 } \
306 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
117 continue; \ 307 continue; \
118 memcpy(ret+off, gnu_short_stack_flags(EGET(phdr[i].p_flags)), 3); \ 308 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
119 *found = 1; \ 309 *found_pax = 1; \
120 ++shown; \ 310 ++shown; \
311 break; \
121 } \ 312 } \
122 } 313 }
123 SHOW_STACK(32) 314 SHOW_PAX(32)
124 SHOW_STACK(64) 315 SHOW_PAX(64)
316 }
317
318 /* Note: We do not support setting EI_PAX if not PT_PAX_FLAGS
319 * was found. This is known to break ELFs on glibc systems,
320 * and mainline PaX has deprecated use of this for a long time.
321 * We could support changing PT_GNU_STACK, but that doesn't
322 * seem like it's worth the effort. #411919
323 */
324
325 /* fall back to EI_PAX if no PT_PAX was found */
326 if (!*ret) {
327 static char *paxflags;
328 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
329 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
330 *found_pax = 1;
331 return (be_wewy_wewy_quiet ? NULL : paxflags);
125 } 332 }
333 strncpy(ret, paxflags, sizeof(ret));
334 }
126 335
127 if (be_quiet && !shown) 336 if (be_wewy_wewy_quiet || (be_quiet && !shown))
128 return NULL; 337 return NULL;
129 else 338 else
130 return ret; 339 return ret;
131} 340}
341
342static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
343{
344 static char ret[12];
345 char *found;
346 unsigned long i, shown, multi_stack, multi_relro, multi_load;
347 int max_pt_load;
348
349 if (!show_phdr) return NULL;
350
351 memcpy(ret, "--- --- ---\0", 12);
352
353 shown = 0;
354 multi_stack = multi_relro = multi_load = 0;
355 max_pt_load = elf_max_pt_load(elf);
356
357#define NOTE_GNU_STACK ".note.GNU-stack"
358#define SHOW_PHDR(B) \
359 if (elf->elf_class == ELFCLASS ## B) { \
360 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
361 Elf ## B ## _Off offset; \
362 uint32_t flags, check_flags; \
363 if (elf->phdr != NULL) { \
364 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
365 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
366 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
367 if (multi_stack++) \
368 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
369 if (file_matches_list(elf->filename, qa_execstack)) \
370 continue; \
371 found = found_phdr; \
372 offset = 0; \
373 check_flags = PF_X; \
374 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
375 if (multi_relro++) \
376 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
377 found = found_relro; \
378 offset = 4; \
379 check_flags = PF_X; \
380 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
381 if (EGET(ehdr->e_type) == ET_DYN || EGET(ehdr->e_type) == ET_EXEC) \
382 if (multi_load++ > max_pt_load) \
383 warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
384 if (file_matches_list(elf->filename, qa_wx_load)) \
385 continue; \
386 found = found_load; \
387 offset = 8; \
388 check_flags = PF_W|PF_X; \
389 } else \
390 continue; \
391 flags = EGET(phdr[i].p_flags); \
392 if (be_quiet && ((flags & check_flags) != check_flags)) \
393 continue; \
394 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
395 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
396 ret[3] = ret[7] = '!'; \
397 flags = EGET(phdr[i].p_flags); \
398 } \
399 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
400 *found = 1; \
401 ++shown; \
402 } \
403 } else if (elf->shdr != NULL) { \
404 /* no program headers which means this is prob an object file */ \
405 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
406 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
407 char *str; \
408 if ((void*)strtbl > elf->data_end) \
409 goto skip_this_shdr##B; \
410 check_flags = SHF_WRITE|SHF_EXECINSTR; \
411 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
412 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
413 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
414 str = elf->data + offset; \
415 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
416 if (!strcmp(str, NOTE_GNU_STACK)) { \
417 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
418 flags = EGET(shdr[i].sh_flags); \
419 if (be_quiet && ((flags & check_flags) != check_flags)) \
420 continue; \
421 ++*found_phdr; \
422 shown = 1; \
423 if (flags & SHF_WRITE) ret[0] = 'W'; \
424 if (flags & SHF_ALLOC) ret[1] = 'A'; \
425 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
426 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
427 break; \
428 } \
429 } \
430 skip_this_shdr##B: \
431 if (!multi_stack) { \
432 if (file_matches_list(elf->filename, qa_execstack)) \
433 return NULL; \
434 *found_phdr = 1; \
435 shown = 1; \
436 memcpy(ret, "!WX", 3); \
437 } \
438 } \
439 }
440 SHOW_PHDR(32)
441 SHOW_PHDR(64)
442
443 if (be_wewy_wewy_quiet || (be_quiet && !shown))
444 return NULL;
445 else
446 return ret;
447}
448
449/*
450 * See if this ELF contains a DT_TEXTREL tag in any of its
451 * PT_DYNAMIC sections.
452 */
132static char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 453static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
133{ 454{
134 static char *ret = "TEXTREL"; 455 static const char *ret = "TEXTREL";
135 unsigned long i; 456 unsigned long i;
136 457
137 if (!show_textrel) return NULL; 458 if (!show_textrel && !show_textrels) return NULL;
459
460 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
138 461
139 if (elf->phdr) { 462 if (elf->phdr) {
140#define SHOW_TEXTREL(B) \ 463#define SHOW_TEXTREL(B) \
141 if (elf->elf_class == ELFCLASS ## B) { \ 464 if (elf->elf_class == ELFCLASS ## B) { \
142 Elf ## B ## _Dyn *dyn; \ 465 Elf ## B ## _Dyn *dyn; \
143 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 466 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
144 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 467 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
145 Elf ## B ## _Off offset; \ 468 Elf ## B ## _Off offset; \
146 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 469 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
147 if (phdr[i].p_type != PT_DYNAMIC) continue; \ 470 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
148 offset = EGET(phdr[i].p_offset); \ 471 offset = EGET(phdr[i].p_offset); \
149 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 472 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
150 dyn = DYN ## B (elf->data + offset); \ 473 dyn = DYN ## B (elf->vdata + offset); \
151 while (EGET(dyn->d_tag) != DT_NULL) { \ 474 while (EGET(dyn->d_tag) != DT_NULL) { \
152 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \ 475 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
153 *found_textrel = 1; \ 476 *found_textrel = 1; \
154 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \ 477 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
155 return ret; \ 478 return (be_wewy_wewy_quiet ? NULL : ret); \
156 } \ 479 } \
157 ++dyn; \ 480 ++dyn; \
158 } \ 481 } \
159 } } 482 } }
160 SHOW_TEXTREL(32) 483 SHOW_TEXTREL(32)
161 SHOW_TEXTREL(64) 484 SHOW_TEXTREL(64)
162 } 485 }
163 486
164 if (be_quiet) 487 if (be_quiet || be_wewy_wewy_quiet)
165 return NULL; 488 return NULL;
166 else 489 else
167 return " - "; 490 return " - ";
168} 491}
492
493/*
494 * Scan the .text section to see if there are any relocations in it.
495 * Should rewrite this to check PT_LOAD sections that are marked
496 * Executable rather than the section named '.text'.
497 */
498static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
499{
500 unsigned long s, r, rmax;
501 void *symtab_void, *strtab_void, *text_void;
502
503 if (!show_textrels) return NULL;
504
505 /* don't search for TEXTREL's if the ELF doesn't have any */
506 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
507 if (!*found_textrel) return NULL;
508
509 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
510 text_void = elf_findsecbyname(elf, ".text");
511
512 if (symtab_void && strtab_void && text_void && elf->shdr) {
513#define SHOW_TEXTRELS(B) \
514 if (elf->elf_class == ELFCLASS ## B) { \
515 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
516 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
517 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
518 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
519 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
520 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
521 uint ## B ## _t memsz = EGET(text->sh_size); \
522 Elf ## B ## _Rel *rel; \
523 Elf ## B ## _Rela *rela; \
524 /* search the section headers for relocations */ \
525 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
526 uint32_t sh_type = EGET(shdr[s].sh_type); \
527 if (sh_type == SHT_REL) { \
528 rel = REL ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
529 rela = NULL; \
530 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
531 } else if (sh_type == SHT_RELA) { \
532 rel = NULL; \
533 rela = RELA ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
534 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
535 } else \
536 continue; \
537 /* now see if any of the relocs are in the .text */ \
538 for (r = 0; r < rmax; ++r) { \
539 unsigned long sym_max; \
540 Elf ## B ## _Addr offset_tmp; \
541 Elf ## B ## _Sym *func; \
542 Elf ## B ## _Sym *sym; \
543 Elf ## B ## _Addr r_offset; \
544 uint ## B ## _t r_info; \
545 if (sh_type == SHT_REL) { \
546 r_offset = EGET(rel[r].r_offset); \
547 r_info = EGET(rel[r].r_info); \
548 } else { \
549 r_offset = EGET(rela[r].r_offset); \
550 r_info = EGET(rela[r].r_info); \
551 } \
552 /* make sure this relocation is inside of the .text */ \
553 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
554 if (be_verbose <= 2) continue; \
555 } else \
556 *found_textrels = 1; \
557 /* locate this relocation symbol name */ \
558 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
559 if ((void*)sym > elf->data_end) { \
560 warn("%s: corrupt ELF symbol", elf->filename); \
561 continue; \
562 } \
563 sym_max = ELF ## B ## _R_SYM(r_info); \
564 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
565 sym += sym_max; \
566 else \
567 sym = NULL; \
568 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
569 /* show the raw details about this reloc */ \
570 printf(" %s: ", elf->base_filename); \
571 if (sym && sym->st_name) \
572 printf("%s", elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
573 else \
574 printf("(memory/data?)"); \
575 printf(" [0x%lX]", (unsigned long)r_offset); \
576 /* now try to find the closest symbol that this rel is probably in */ \
577 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
578 func = NULL; \
579 offset_tmp = 0; \
580 while (sym_max--) { \
581 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
582 func = sym; \
583 offset_tmp = EGET(sym->st_value); \
584 } \
585 ++sym; \
586 } \
587 printf(" in "); \
588 if (func && func->st_name) { \
589 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
590 if (r_offset > EGET(func->st_size)) \
591 printf("(optimized out: previous %s)", func_name); \
592 else \
593 printf("%s", func_name); \
594 } else \
595 printf("(optimized out)"); \
596 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
597 if (be_verbose && has_objdump) { \
598 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
599 char *sysbuf; \
600 size_t syslen; \
601 const char sysfmt[] = "objdump -r -R -d -w -l --start-address=0x%lX --stop-address=0x%lX %s | grep --color -i -C 3 '.*[[:space:]]%lX:[[:space:]]*R_.*'\n"; \
602 syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
603 sysbuf = xmalloc(syslen); \
604 if (end_addr < r_offset) \
605 /* not uncommon when things are optimized out */ \
606 end_addr = r_offset + 0x100; \
607 snprintf(sysbuf, syslen, sysfmt, \
608 (unsigned long)offset_tmp, \
609 (unsigned long)end_addr, \
610 elf->filename, \
611 (unsigned long)r_offset); \
612 fflush(stdout); \
613 if (system(sysbuf)) /* don't care */; \
614 fflush(stdout); \
615 free(sysbuf); \
616 } \
617 } \
618 } }
619 SHOW_TEXTRELS(32)
620 SHOW_TEXTRELS(64)
621 }
622 if (!*found_textrels)
623 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
624
625 return NULL;
626}
627
628static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
629{
630 struct stat st;
631 switch (*item) {
632 case '/': break;
633 case '.':
634 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
635 break;
636 case ':':
637 case '\0':
638 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
639 break;
640 case '$':
641 if (fstat(elf->fd, &st) != -1)
642 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
643 warnf("Security problem with %s='%s' in %s with mode set of %o",
644 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
645 break;
646 default:
647 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
648 break;
649 }
650}
169static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len) 651static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
170{ 652{
171 /* TODO: if be_quiet, only output RPATH's which aren't in /etc/ld.so.conf */
172 unsigned long i; 653 unsigned long i;
173 char *rpath, *runpath; 654 char *rpath, *runpath, **r;
174 void *strtbl_void; 655 void *strtbl_void;
175 656
176 if (!show_rpath) return; 657 if (!show_rpath) return;
177 658
178 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 659 strtbl_void = elf_findsecbyname(elf, ".dynstr");
184 Elf ## B ## _Dyn *dyn; \ 665 Elf ## B ## _Dyn *dyn; \
185 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 666 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
186 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 667 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
187 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 668 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
188 Elf ## B ## _Off offset; \ 669 Elf ## B ## _Off offset; \
670 Elf ## B ## _Xword word; \
671 /* Scan all the program headers */ \
189 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 672 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
673 /* Just scan dynamic headers */ \
190 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 674 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
191 offset = EGET(phdr[i].p_offset); \ 675 offset = EGET(phdr[i].p_offset); \
192 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 676 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
677 /* Just scan dynamic RPATH/RUNPATH headers */ \
193 dyn = DYN ## B (elf->data + offset); \ 678 dyn = DYN ## B (elf->vdata + offset); \
194 while (EGET(dyn->d_tag) != DT_NULL) { \ 679 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
195 if (EGET(dyn->d_tag) == DT_RPATH) { \ 680 if (word == DT_RPATH) { \
196 if (rpath) warn("ELF has multiple DT_RPATH's !?"); \ 681 r = &rpath; \
682 } else if (word == DT_RUNPATH) { \
683 r = &runpath; \
684 } else { \
685 ++dyn; \
686 continue; \
687 } \
688 /* Verify the memory is somewhat sane */ \
197 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 689 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
198 if (offset >= elf->len) continue; \ 690 if (offset < (Elf ## B ## _Off)elf->len) { \
691 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
199 rpath = (char*)(elf->data + offset); \ 692 *r = elf->data + offset; \
693 /* cache the length in case we need to nuke this section later on */ \
694 if (fix_elf) \
695 offset = strlen(*r); \
696 /* If quiet, don't output paths in ld.so.conf */ \
697 if (be_quiet) { \
698 size_t len; \
699 char *start, *end; \
700 /* note that we only 'chop' off leading known paths. */ \
701 /* since *r is read-only memory, we can only move the ptr forward. */ \
702 start = *r; \
703 /* scan each path in : delimited list */ \
704 while (start) { \
705 rpath_security_checks(elf, start, get_elfdtype(word)); \
706 end = strchr(start, ':'); \
707 len = (end ? abs(end - start) : strlen(start)); \
708 if (use_ldcache) { \
709 size_t n; \
710 const char *ldpath; \
711 array_for_each(ldpaths, n, ldpath) \
712 if (!strncmp(ldpath, start, len) && !ldpath[len]) { \
713 *r = end; \
714 /* corner case ... if RPATH reads "/usr/lib:", we want \
715 * to show ':' rather than '' */ \
716 if (end && end[1] != '\0') \
717 (*r)++; \
718 break; \
719 } \
720 } \
721 if (!*r || !end) \
722 break; \
723 else \
724 start = start + len + 1; \
725 } \
726 } \
727 if (*r) { \
728 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
729 /* just nuke it */ \
730 nuke_it##B: \
731 memset(*r, 0x00, offset); \
732 *r = NULL; \
733 ESET(dyn->d_tag, DT_DEBUG); \
734 ESET(dyn->d_un.d_ptr, 0); \
735 } else if (fix_elf) { \
736 /* try to clean "bad" paths */ \
737 size_t len, tmpdir_len; \
738 char *start, *end; \
739 const char *tmpdir; \
740 start = *r; \
741 tmpdir = (getenv("TMPDIR") ? : "."); \
742 tmpdir_len = strlen(tmpdir); \
743 while (1) { \
744 end = strchr(start, ':'); \
745 if (start == end) { \
746 eat_this_path##B: \
747 len = strlen(end); \
748 memmove(start, end+1, len); \
749 start[len-1] = '\0'; \
750 end = start - 1; \
751 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
752 if (!end) { \
753 if (start == *r) \
754 goto nuke_it##B; \
755 *--start = '\0'; \
756 } else \
757 goto eat_this_path##B; \
758 } \
759 if (!end) \
760 break; \
761 start = end + 1; \
762 } \
763 if (**r == '\0') \
764 goto nuke_it##B; \
765 } \
766 if (*r) \
200 *found_rpath = 1; \ 767 *found_rpath = 1; \
201 } else if (EGET(dyn->d_tag) == DT_RUNPATH) { \ 768 } \
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 } \ 769 } \
208 ++dyn; \ 770 ++dyn; \
209 } \ 771 } \
210 } } 772 } }
211 SHOW_RPATH(32) 773 SHOW_RPATH(32)
212 SHOW_RPATH(64) 774 SHOW_RPATH(64)
213 } 775 }
776
777 if (be_wewy_wewy_quiet) return;
214 778
215 if (rpath && runpath) { 779 if (rpath && runpath) {
216 if (!strcmp(rpath, runpath)) { 780 if (!strcmp(rpath, runpath)) {
217 xstrcat(ret, runpath, ret_len); 781 xstrcat(ret, runpath, ret_len);
218 } else { 782 } else {
226 } else if (rpath || runpath) 790 } else if (rpath || runpath)
227 xstrcat(ret, (runpath ? runpath : rpath), ret_len); 791 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
228 else if (!be_quiet) 792 else if (!be_quiet)
229 xstrcat(ret, " - ", ret_len); 793 xstrcat(ret, " - ", ret_len);
230} 794}
795
796#define LDSO_CACHE_MAGIC "ld.so-"
797#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
798#define LDSO_CACHE_VER "1.7.0"
799#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
800#define FLAG_ANY -1
801#define FLAG_TYPE_MASK 0x00ff
802#define FLAG_LIBC4 0x0000
803#define FLAG_ELF 0x0001
804#define FLAG_ELF_LIBC5 0x0002
805#define FLAG_ELF_LIBC6 0x0003
806#define FLAG_REQUIRED_MASK 0xff00
807#define FLAG_SPARC_LIB64 0x0100
808#define FLAG_IA64_LIB64 0x0200
809#define FLAG_X8664_LIB64 0x0300
810#define FLAG_S390_LIB64 0x0400
811#define FLAG_POWERPC_LIB64 0x0500
812#define FLAG_MIPS64_LIBN32 0x0600
813#define FLAG_MIPS64_LIBN64 0x0700
814
815#if defined(__GLIBC__) || defined(__UCLIBC__)
816
817static char *lookup_cache_lib(elfobj *elf, const char *fname)
818{
819 int fd;
820 char *strs;
821 static char buf[__PAX_UTILS_PATH_MAX] = "";
822 const char *cachefile = root_rel_path("/etc/ld.so.cache");
823 struct stat st;
824
825 typedef struct {
826 char magic[LDSO_CACHE_MAGIC_LEN];
827 char version[LDSO_CACHE_VER_LEN];
828 int nlibs;
829 } header_t;
830 header_t *header;
831
832 typedef struct {
833 int flags;
834 int sooffset;
835 int liboffset;
836 } libentry_t;
837 libentry_t *libent;
838
839 if (fname == NULL)
840 return NULL;
841
842 if (ldcache == NULL) {
843 if (fstatat(root_fd, cachefile, &st, 0))
844 return NULL;
845
846 fd = openat(root_fd, cachefile, O_RDONLY);
847 if (fd == -1)
848 return NULL;
849
850 /* cache these values so we only map/unmap the cache file once */
851 ldcache_size = st.st_size;
852 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
853 close(fd);
854
855 if (ldcache == MAP_FAILED) {
856 ldcache = NULL;
857 return NULL;
858 }
859
860 if (memcmp(header->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN) ||
861 memcmp(header->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
862 {
863 munmap(ldcache, ldcache_size);
864 ldcache = NULL;
865 return NULL;
866 }
867 } else
868 header = ldcache;
869
870 libent = ldcache + sizeof(header_t);
871 strs = (char *) &libent[header->nlibs];
872
873 for (fd = 0; fd < header->nlibs; ++fd) {
874 /* This should be more fine grained, but for now we assume that
875 * diff arches will not be cached together, and we ignore the
876 * the different multilib mips cases.
877 */
878 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
879 continue;
880 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
881 continue;
882
883 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
884 continue;
885
886 /* Return first hit because that is how the ldso rolls */
887 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
888 break;
889 }
890
891 return buf;
892}
893
894#elif defined(__NetBSD__)
895static char *lookup_cache_lib(elfobj *elf, const char *fname)
896{
897 static char buf[__PAX_UTILS_PATH_MAX] = "";
898 static struct stat st;
899 size_t n;
900 char *ldpath;
901
902 array_for_each(ldpath, n, ldpath) {
903 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", ldpath, fname) >= sizeof(buf))
904 continue; /* if the pathname is too long, or something went wrong, ignore */
905
906 if (stat(buf, &st) != 0)
907 continue; /* if the lib doesn't exist in *ldpath, look further */
908
909 /* NetBSD doesn't actually do sanity checks, it just loads the file
910 * and if that doesn't work, continues looking in other directories.
911 * This cannot easily be safely emulated, unfortunately. For now,
912 * just assume that if it exists, it's a valid library. */
913
914 return buf;
915 }
916
917 /* not found in any path */
918 return NULL;
919}
920#else
921#ifdef __ELF__
922#warning Cache support not implemented for your target
923#endif
924static char *lookup_cache_lib(elfobj *elf, const char *fname)
925{
926 return NULL;
927}
928#endif
929
930static char *lookup_config_lib(elfobj *elf, char *fname)
931{
932 static char buf[__PAX_UTILS_PATH_MAX] = "";
933 const char *ldpath;
934 size_t n;
935
936 array_for_each(ldpaths, n, ldpath) {
937 snprintf(buf, sizeof(buf), "%s/%s", root_rel_path(ldpath), fname);
938 if (faccessat(root_fd, buf, F_OK, AT_SYMLINK_NOFOLLOW) == 0)
939 return buf;
940 }
941
942 return NULL;
943}
944
231static void scanelf_file_needed(elfobj *elf, char *found_needed, char **ret, size_t *ret_len) 945static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
232{ 946{
233 unsigned long i; 947 unsigned long i;
234 char *needed; 948 char *needed;
235 void *strtbl_void; 949 void *strtbl_void;
950 char *p;
236 951
237 if (!show_needed) return; 952 /*
953 * -n -> op==0 -> print all
954 * -N -> op==1 -> print requested
955 */
956 if ((op == 0 && !show_needed) || (op == 1 && !find_lib))
957 return NULL;
238 958
239 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 959 strtbl_void = elf_findsecbyname(elf, ".dynstr");
240 960
241 if (elf->phdr && strtbl_void) { 961 if (elf->phdr && strtbl_void) {
242#define SHOW_NEEDED(B) \ 962#define SHOW_NEEDED(B) \
244 Elf ## B ## _Dyn *dyn; \ 964 Elf ## B ## _Dyn *dyn; \
245 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 965 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
246 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 966 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
247 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 967 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
248 Elf ## B ## _Off offset; \ 968 Elf ## B ## _Off offset; \
969 size_t matched = 0; \
970 /* Walk all the program headers to find the PT_DYNAMIC */ \
249 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 971 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
250 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 972 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) \
973 continue; \
251 offset = EGET(phdr[i].p_offset); \ 974 offset = EGET(phdr[i].p_offset); \
252 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 975 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
976 continue; \
977 /* Walk all the dynamic tags to find NEEDED entries */ \
253 dyn = DYN ## B (elf->data + offset); \ 978 dyn = DYN ## B (elf->vdata + offset); \
254 while (EGET(dyn->d_tag) != DT_NULL) { \ 979 while (EGET(dyn->d_tag) != DT_NULL) { \
255 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 980 if (EGET(dyn->d_tag) == DT_NEEDED) { \
256 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 981 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
257 if (offset >= elf->len) continue; \ 982 if (offset >= (Elf ## B ## _Off)elf->len) { \
983 ++dyn; \
984 continue; \
985 } \
258 needed = (char*)(elf->data + offset); \ 986 needed = elf->data + offset; \
987 if (op == 0) { \
988 /* -n -> print all entries */ \
989 if (!be_wewy_wewy_quiet) { \
259 if (*found_needed) xchrcat(ret, ',', ret_len); \ 990 if (*found_needed) xchrcat(ret, ',', ret_len); \
991 if (use_ldpath) { \
992 if ((p = lookup_config_lib(elf, needed)) != NULL) \
993 needed = p; \
994 } else if (use_ldcache) { \
995 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
996 needed = p; \
997 } \
260 xstrcat(ret, needed, ret_len); \ 998 xstrcat(ret, needed, ret_len); \
999 } \
261 *found_needed = 1; \ 1000 *found_needed = 1; \
1001 } else { \
1002 /* -N -> print matching entries */ \
1003 size_t n; \
1004 const char *find_lib_name; \
1005 \
1006 array_for_each(find_lib_arr, n, find_lib_name) { \
1007 int invert = 1; \
1008 if (find_lib_name[0] == '!') \
1009 invert = 0, ++find_lib_name; \
1010 if (!strcmp(find_lib_name, needed) == invert) \
1011 ++matched; \
1012 } \
1013 \
1014 if (matched == array_cnt(find_lib_arr)) { \
1015 *found_lib = 1; \
1016 return (be_wewy_wewy_quiet ? NULL : find_lib); \
1017 } \
1018 } \
262 } \ 1019 } \
263 ++dyn; \ 1020 ++dyn; \
264 } \ 1021 } \
265 } } 1022 } }
266 SHOW_NEEDED(32) 1023 SHOW_NEEDED(32)
267 SHOW_NEEDED(64) 1024 SHOW_NEEDED(64)
1025 if (op == 0 && !*found_needed && be_verbose)
1026 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
268 } 1027 }
1028
1029 return NULL;
269} 1030}
270static char *scanelf_file_interp(elfobj *elf, char *found_interp) 1031static char *scanelf_file_interp(elfobj *elf, char *found_interp)
271{ 1032{
272 void *strtbl_void; 1033 void *strtbl_void;
273 1034
278 if (strtbl_void) { 1039 if (strtbl_void) {
279#define SHOW_INTERP(B) \ 1040#define SHOW_INTERP(B) \
280 if (elf->elf_class == ELFCLASS ## B) { \ 1041 if (elf->elf_class == ELFCLASS ## B) { \
281 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 1042 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
282 *found_interp = 1; \ 1043 *found_interp = 1; \
283 return elf->data + EGET(strtbl->sh_offset); \ 1044 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
284 } 1045 }
285 SHOW_INTERP(32) 1046 SHOW_INTERP(32)
286 SHOW_INTERP(64) 1047 SHOW_INTERP(64)
287 } 1048 }
288 return NULL; 1049 return NULL;
289} 1050}
290static char *scanelf_file_sym(elfobj *elf, char *found_sym, const char *filename) 1051static char *scanelf_file_bind(elfobj *elf, char *found_bind)
291{ 1052{
292 unsigned long i; 1053 unsigned long i;
1054 struct stat s;
1055 char dynamic = 0;
1056
1057 if (!show_bind) return NULL;
1058 if (!elf->phdr) return NULL;
1059
1060#define SHOW_BIND(B) \
1061 if (elf->elf_class == ELFCLASS ## B) { \
1062 Elf ## B ## _Dyn *dyn; \
1063 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1064 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1065 Elf ## B ## _Off offset; \
1066 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1067 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1068 dynamic = 1; \
1069 offset = EGET(phdr[i].p_offset); \
1070 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
1071 dyn = DYN ## B (elf->vdata + offset); \
1072 while (EGET(dyn->d_tag) != DT_NULL) { \
1073 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
1074 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
1075 { \
1076 if (be_quiet) return NULL; \
1077 *found_bind = 1; \
1078 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
1079 } \
1080 ++dyn; \
1081 } \
1082 } \
1083 }
1084 SHOW_BIND(32)
1085 SHOW_BIND(64)
1086
1087 if (be_wewy_wewy_quiet) return NULL;
1088
1089 /* don't output anything if quiet mode and the ELF is static or not setuid */
1090 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
1091 return NULL;
1092 } else {
1093 *found_bind = 1;
1094 return (char *)(dynamic ? "LAZY" : "STATIC");
1095 }
1096}
1097static char *scanelf_file_soname(elfobj *elf, char *found_soname)
1098{
1099 unsigned long i;
1100 char *soname;
1101 void *strtbl_void;
1102
1103 if (!show_soname) return NULL;
1104
1105 strtbl_void = elf_findsecbyname(elf, ".dynstr");
1106
1107 if (elf->phdr && strtbl_void) {
1108#define SHOW_SONAME(B) \
1109 if (elf->elf_class == ELFCLASS ## B) { \
1110 Elf ## B ## _Dyn *dyn; \
1111 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1112 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1113 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
1114 Elf ## B ## _Off offset; \
1115 /* only look for soname in shared objects */ \
1116 if (EGET(ehdr->e_type) != ET_DYN) \
1117 return NULL; \
1118 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1119 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1120 offset = EGET(phdr[i].p_offset); \
1121 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
1122 dyn = DYN ## B (elf->vdata + offset); \
1123 while (EGET(dyn->d_tag) != DT_NULL) { \
1124 if (EGET(dyn->d_tag) == DT_SONAME) { \
1125 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
1126 if (offset >= (Elf ## B ## _Off)elf->len) { \
1127 ++dyn; \
1128 continue; \
1129 } \
1130 soname = elf->data + offset; \
1131 *found_soname = 1; \
1132 return (be_wewy_wewy_quiet ? NULL : soname); \
1133 } \
1134 ++dyn; \
1135 } \
1136 } }
1137 SHOW_SONAME(32)
1138 SHOW_SONAME(64)
1139 }
1140
1141 return NULL;
1142}
1143
1144/*
1145 * We support the symbol form:
1146 * [%[modifiers]%][[+-]<symbol name>][,[.....]]
1147 * If the symbol name is empty, then all symbols are matched.
1148 * If the symbol name is a glob ("*"), then all symbols are dumped (debug).
1149 * Do not rely on this output format at all.
1150 * Otherwise the symbol name is used to search (either regex or string compare).
1151 * If the first char of the symbol name is a plus ("+"), then only match
1152 * defined symbols. If it's a minus ("-"), only match undefined symbols.
1153 * Putting modifiers in between the percent signs allows for more in depth
1154 * filters. There are groups of modifiers. If you don't specify a member
1155 * of a group, then all types in that group are matched. The current
1156 * groups and their types are:
1157 * STT group: STT_NOTYPE:n STT_OBJECT:o STT_FUNC:f STT_FILE:F
1158 * STB group: STB_LOCAL:l STB_GLOBAL:g STB_WEAK:w
1159 * SHN group: SHN_UNDEF:u SHN_ABS:a SHN_COMMON:c {defined}:d
1160 * The "defined" value in the SHN group does not correspond to a SHN_xxx define.
1161 * You can search for multiple symbols at once by seperating with a comma (",").
1162 *
1163 * Some examples:
1164 * ELFs with a weak function "foo":
1165 * scanelf -s %wf%foo <ELFs>
1166 * ELFs that define the symbol "main":
1167 * scanelf -s +main <ELFs>
1168 * scanelf -s %d%main <ELFs>
1169 * ELFs that refer to the undefined symbol "brk":
1170 * scanelf -s -brk <ELFs>
1171 * scanelf -s %u%brk <ELFs>
1172 * All global defined objects in an ELF:
1173 * scanelf -s %ogd% <ELF>
1174 */
1175static void
1176scanelf_match_symname(elfobj *elf, char *found_sym, char **ret, size_t *ret_len, const char *symname,
1177 unsigned int stt, unsigned int stb, unsigned int shn, unsigned long size)
1178{
1179 char *this_sym, *next_sym, saved = saved;
1180
1181 /* allow the user to specify a comma delimited list of symbols to search for */
1182 next_sym = NULL;
1183 do {
1184 bool inc_notype, inc_object, inc_func, inc_file,
1185 inc_local, inc_global, inc_weak,
1186 inc_def, inc_undef, inc_abs, inc_common;
1187
1188 if (next_sym) {
1189 next_sym[-1] = saved;
1190 this_sym = next_sym;
1191 } else
1192 this_sym = find_sym;
1193 if ((next_sym = strchr(this_sym, ','))) {
1194 /* make parsing easier by killing the comma temporarily */
1195 saved = *next_sym;
1196 *next_sym = '\0';
1197 next_sym += 1;
1198 }
1199
1200 /* symbol selection! */
1201 inc_notype = inc_object = inc_func = inc_file = \
1202 inc_local = inc_global = inc_weak = \
1203 inc_def = inc_undef = inc_abs = inc_common = \
1204 (*this_sym != '%');
1205
1206 /* parse the contents of %...% */
1207 if (!inc_notype) {
1208 while (*(this_sym++)) {
1209 if (*this_sym == '%') {
1210 ++this_sym;
1211 break;
1212 }
1213 switch (*this_sym) {
1214 case 'n': inc_notype = true; break;
1215 case 'o': inc_object = true; break;
1216 case 'f': inc_func = true; break;
1217 case 'F': inc_file = true; break;
1218 case 'l': inc_local = true; break;
1219 case 'g': inc_global = true; break;
1220 case 'w': inc_weak = true; break;
1221 case 'd': inc_def = true; break;
1222 case 'u': inc_undef = true; break;
1223 case 'a': inc_abs = true; break;
1224 case 'c': inc_common = true; break;
1225 default: err("invalid symbol selector '%c'", *this_sym);
1226 }
1227 }
1228
1229 /* If no types are matched, not match all */
1230 if (!inc_notype && !inc_object && !inc_func && !inc_file)
1231 inc_notype = inc_object = inc_func = inc_file = true;
1232 if (!inc_local && !inc_global && !inc_weak)
1233 inc_local = inc_global = inc_weak = true;
1234 if (!inc_def && !inc_undef && !inc_abs && !inc_common)
1235 inc_def = inc_undef = inc_abs = inc_common = true;
1236
1237 /* backwards compat for defined/undefined short hand */
1238 } else if (*this_sym == '+') {
1239 inc_undef = false;
1240 ++this_sym;
1241 } else if (*this_sym == '-') {
1242 inc_def = inc_abs = inc_common = false;
1243 ++this_sym;
1244 }
1245
1246 /* filter symbols */
1247 if ((!inc_notype && stt == STT_NOTYPE) || \
1248 (!inc_object && stt == STT_OBJECT) || \
1249 (!inc_func && stt == STT_FUNC ) || \
1250 (!inc_file && stt == STT_FILE ) || \
1251 (!inc_local && stb == STB_LOCAL ) || \
1252 (!inc_global && stb == STB_GLOBAL) || \
1253 (!inc_weak && stb == STB_WEAK ) || \
1254 (!inc_def && shn && shn < SHN_LORESERVE) || \
1255 (!inc_undef && shn == SHN_UNDEF ) || \
1256 (!inc_abs && shn == SHN_ABS ) || \
1257 (!inc_common && shn == SHN_COMMON))
1258 continue;
1259
1260 if (*this_sym == '*') {
1261 /* a "*" symbol gets you debug output */
1262 printf("%s(%s) %5lX %15s %15s %15s %s\n",
1263 ((*found_sym == 0) ? "\n\t" : "\t"),
1264 elf->base_filename,
1265 size,
1266 get_elfstttype(stt),
1267 get_elfstbtype(stb),
1268 get_elfshntype(shn),
1269 symname);
1270 goto matched;
1271
1272 } else {
1273 if (g_match) {
1274 /* regex match the symbol */
1275 if (rematch(this_sym, symname, REG_EXTENDED) != 0)
1276 continue;
1277
1278 } else if (*this_sym) {
1279 /* give empty symbols a "pass", else do a normal compare */
1280 const size_t len = strlen(this_sym);
1281 if (!(strncmp(this_sym, symname, len) == 0 &&
1282 /* Accept unversioned symbol names */
1283 (symname[len] == '\0' || symname[len] == '@')))
1284 continue;
1285 }
1286
1287 if (be_semi_verbose) {
1288 char buf[1024];
1289 snprintf(buf, sizeof(buf), "%lX %s %s",
1290 size,
1291 get_elfstttype(stt),
1292 this_sym);
1293 *ret = xstrdup(buf);
1294 } else {
1295 if (*ret) xchrcat(ret, ',', ret_len);
1296 xstrcat(ret, symname, ret_len);
1297 }
1298
1299 goto matched;
1300 }
1301 } while (next_sym);
1302
1303 return;
1304
1305 matched:
1306 *found_sym = 1;
1307 if (next_sym)
1308 next_sym[-1] = saved;
1309}
1310
1311static const char *scanelf_file_sym(elfobj *elf, char *found_sym)
1312{
1313 char *ret;
293 void *symtab_void, *strtab_void; 1314 void *symtab_void, *strtab_void;
294 1315
295 if (!find_sym) return NULL; 1316 if (!find_sym) return NULL;
1317 ret = NULL;
296 1318
297 symtab_void = elf_findsecbyname(elf, ".symtab"); 1319 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
298 strtab_void = elf_findsecbyname(elf, ".strtab");
299 1320
300 if (symtab_void && strtab_void) { 1321 if (symtab_void && strtab_void) {
301#define FIND_SYM(B) \ 1322#define FIND_SYM(B) \
302 if (elf->elf_class == ELFCLASS ## B) { \ 1323 if (elf->elf_class == ELFCLASS ## B) { \
303 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 1324 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
304 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 1325 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
305 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 1326 Elf ## B ## _Sym *sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
306 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 1327 Elf ## B ## _Word i, cnt = EGET(symtab->sh_entsize); \
307 char *symname; \ 1328 char *symname; \
1329 size_t ret_len = 0; \
1330 if (cnt) \
1331 cnt = EGET(symtab->sh_size) / cnt; \
308 for (i = 0; i < cnt; ++i) { \ 1332 for (i = 0; i < cnt; ++i) { \
1333 if ((void*)sym > elf->data_end) { \
1334 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1335 goto break_out; \
1336 } \
309 if (sym->st_name) { \ 1337 if (sym->st_name) { \
1338 /* make sure the symbol name is in acceptable memory range */ \
310 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 1339 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
311 if (*find_sym == '*') { \ 1340 if ((void*)symname > elf->data_end) { \
312 printf("%s(%s) %5lX %15s %s\n", \ 1341 warnf("%s: corrupt ELF symbols", elf->filename); \
313 ((*found_sym == 0) ? "\n\t" : "\t"), \ 1342 ++sym; \
314 (char *)basename(filename), \ 1343 continue; \
315 (long)sym->st_size, \ 1344 } \
316 (char *)get_elfstttype(sym->st_info), \ 1345 scanelf_match_symname(elf, found_sym, \
317 symname); \ 1346 &ret, &ret_len, symname, \
318 *found_sym = 1; \ 1347 ELF##B##_ST_TYPE(EGET(sym->st_info)), \
319 } else if ((strcmp(find_sym, symname) == 0) || \ 1348 ELF##B##_ST_BIND(EGET(sym->st_info)), \
320 (strcmp(symname, versioned_symname) == 0)) \ 1349 EGET(sym->st_shndx), \
321 (*found_sym)++; \ 1350 /* st_size can be 64bit, but no one is really that big, so screw em */ \
1351 EGET(sym->st_size)); \
322 } \ 1352 } \
323 ++sym; \ 1353 ++sym; \
324 } } 1354 } \
1355 }
325 FIND_SYM(32) 1356 FIND_SYM(32)
326 FIND_SYM(64) 1357 FIND_SYM(64)
327 } 1358 }
1359
1360break_out:
1361 if (be_wewy_wewy_quiet) return NULL;
1362
328 if (*find_sym != '*' && *found_sym) 1363 if (*find_sym != '*' && *found_sym)
329 return find_sym; 1364 return ret;
330 if (be_quiet) 1365 if (be_quiet)
331 return NULL; 1366 return NULL;
332 else 1367 else
333 return " - "; 1368 return " - ";
334} 1369}
1370
1371static const char *scanelf_file_sections(elfobj *elf, char *found_section)
1372{
1373 if (!find_section)
1374 return NULL;
1375
1376#define FIND_SECTION(B) \
1377 if (elf->elf_class == ELFCLASS ## B) { \
1378 size_t matched, n; \
1379 int invert; \
1380 const char *section_name; \
1381 Elf ## B ## _Shdr *section; \
1382 \
1383 matched = 0; \
1384 array_for_each(find_section_arr, n, section_name) { \
1385 invert = (*section_name == '!' ? 1 : 0); \
1386 section = SHDR ## B (elf_findsecbyname(elf, section_name + invert)); \
1387 if ((section == NULL && invert) || (section != NULL && !invert)) \
1388 ++matched; \
1389 } \
1390 \
1391 if (matched == array_cnt(find_section_arr)) \
1392 *found_section = 1; \
1393 }
1394 FIND_SECTION(32)
1395 FIND_SECTION(64)
1396
1397 if (be_wewy_wewy_quiet)
1398 return NULL;
1399
1400 if (*found_section)
1401 return find_section;
1402
1403 if (be_quiet)
1404 return NULL;
1405 else
1406 return " - ";
1407}
1408
335/* scan an elf file and show all the fun stuff */ 1409/* scan an elf file and show all the fun stuff */
336#define prints(str) fputs(str, stdout) 1410#define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
337static void scanelf_file(const char *filename) 1411static int scanelf_elfobj(elfobj *elf)
338{ 1412{
339 unsigned long i; 1413 unsigned long i;
340 char found_pax, found_stack, found_relro, found_textrel, 1414 char found_pax, found_phdr, found_relro, found_load, found_textrel,
341 found_rpath, found_needed, found_interp, found_sym, 1415 found_rpath, found_needed, found_interp, found_bind, found_soname,
342 found_file; 1416 found_sym, found_lib, found_file, found_textrels, found_section;
343 elfobj *elf;
344 struct stat st;
345 static char *out_buffer = NULL; 1417 static char *out_buffer = NULL;
346 static size_t out_len; 1418 static size_t out_len;
347 1419
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 = \ 1420 found_pax = found_phdr = found_relro = found_load = found_textrel = \
360 found_rpath = found_needed = found_interp = found_sym = \ 1421 found_rpath = found_needed = found_interp = found_bind = found_soname = \
361 found_file = 0; 1422 found_sym = found_lib = found_file = found_textrels = found_section = 0;
362 1423
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) 1424 if (be_verbose > 2)
370 printf("%s: scanning file {%s,%s}\n", filename, 1425 printf("%s: scanning file {%s,%s}\n", elf->filename,
371 get_elfeitype(elf, EI_CLASS, elf->elf_class), 1426 get_elfeitype(EI_CLASS, elf->elf_class),
372 get_elfeitype(elf, EI_DATA, elf->data[EI_DATA])); 1427 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
373 else if (be_verbose) 1428 else if (be_verbose > 1)
374 printf("%s: scanning file\n", filename); 1429 printf("%s: scanning file\n", elf->filename);
375 1430
376 /* init output buffer */ 1431 /* init output buffer */
377 if (!out_buffer) { 1432 if (!out_buffer) {
378 out_len = sizeof(char) * 80; 1433 out_len = sizeof(char) * 80;
379 out_buffer = (char*)xmalloc(out_len); 1434 out_buffer = xmalloc(out_len);
380 } 1435 }
381 *out_buffer = '\0'; 1436 *out_buffer = '\0';
382 1437
383 /* show the header */ 1438 /* show the header */
384 if (!be_quiet && show_banner) { 1439 if (!be_quiet && show_banner) {
385 for (i=0; out_format[i]; ++i) { 1440 for (i = 0; out_format[i]; ++i) {
386 if (out_format[i] != '%') continue; 1441 if (!IS_MODIFIER(out_format[i])) continue;
387 1442
388 switch (out_format[++i]) { 1443 switch (out_format[++i]) {
1444 case '+': break;
389 case '%': break; 1445 case '%': break;
1446 case '#': break;
1447 case 'F':
1448 case 'p':
390 case 'F': prints("FILE "); break; 1449 case 'f': prints("FILE "); found_file = 1; break;
391 case 'o': prints(" TYPE "); break; 1450 case 'o': prints(" TYPE "); break;
392 case 'x': prints(" PAX "); break; 1451 case 'x': prints(" PAX "); break;
393 case 'e': prints("STK/REL "); break; 1452 case 'e': prints("STK/REL/PTL "); break;
394 case 't': prints("TEXTREL "); break; 1453 case 't': prints("TEXTREL "); break;
395 case 'r': prints("RPATH "); break; 1454 case 'r': prints("RPATH "); break;
1455 case 'M': prints("CLASS "); break;
1456 case 'l':
396 case 'n': prints("NEEDED "); break; 1457 case 'n': prints("NEEDED "); break;
397 case 'i': prints("INTERP "); break; 1458 case 'i': prints("INTERP "); break;
1459 case 'b': prints("BIND "); break;
1460 case 'Z': prints("SIZE "); break;
1461 case 'S': prints("SONAME "); break;
398 case 's': prints("SYM "); break; 1462 case 's': prints("SYM "); break;
1463 case 'N': prints("LIB "); break;
1464 case 'T': prints("TEXTRELS "); break;
1465 case 'k': prints("SECTION "); break;
1466 case 'a': prints("ARCH "); break;
1467 case 'I': prints("OSABI "); break;
1468 case 'Y': prints("EABI "); break;
1469 case 'O': prints("PERM "); break;
1470 case 'D': prints("ENDIAN "); break;
1471 default: warnf("'%c' has no title ?", out_format[i]);
399 } 1472 }
400 } 1473 }
1474 if (!found_file) prints("FILE ");
401 prints("\n"); 1475 prints("\n");
1476 found_file = 0;
402 show_banner = 0; 1477 show_banner = 0;
403 } 1478 }
404 1479
405 /* dump all the good stuff */ 1480 /* dump all the good stuff */
406 for (i=0; out_format[i]; ++i) { 1481 for (i = 0; out_format[i]; ++i) {
407 const char *out; 1482 const char *out;
408 1483 const char *tmp;
409 /* make sure we trim leading spaces in quiet mode */ 1484 static char ubuf[sizeof(unsigned long)*2];
410 if (be_quiet && *out_buffer == ' ' && !out_buffer[1]) 1485 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); 1486 xchrcat(&out_buffer, out_format[i], &out_len);
415 continue; 1487 continue;
416 } 1488 }
417 1489
418 out = NULL; 1490 out = NULL;
1491 be_wewy_wewy_quiet = (out_format[i] == '#');
1492 be_semi_verbose = (out_format[i] == '+');
419 switch (out_format[++i]) { 1493 switch (out_format[++i]) {
1494 case '+':
1495 case '%':
1496 case '#':
420 case '%': xchrcat(&out_buffer, '%', &out_len); break; 1497 xchrcat(&out_buffer, out_format[i], &out_len); break;
421 case 'F': found_file = 1; xstrcat(&out_buffer, filename, &out_len); break; 1498 case 'F':
1499 found_file = 1;
1500 if (be_wewy_wewy_quiet) break;
1501 xstrcat(&out_buffer, elf->filename, &out_len);
1502 break;
1503 case 'p':
1504 found_file = 1;
1505 if (be_wewy_wewy_quiet) break;
1506 tmp = elf->filename;
1507 if (search_path) {
1508 ssize_t len_search = strlen(search_path);
1509 ssize_t len_file = strlen(elf->filename);
1510 if (!strncmp(elf->filename, search_path, len_search) && \
1511 len_file > len_search)
1512 tmp += len_search;
1513 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1514 }
1515 xstrcat(&out_buffer, tmp, &out_len);
1516 break;
1517 case 'f':
1518 found_file = 1;
1519 if (be_wewy_wewy_quiet) break;
1520 tmp = strrchr(elf->filename, '/');
1521 tmp = (tmp == NULL ? elf->filename : tmp+1);
1522 xstrcat(&out_buffer, tmp, &out_len);
1523 break;
422 case 'o': out = get_elfetype(elf); break; 1524 case 'o': out = get_elfetype(elf); break;
423 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1525 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
424 case 'e': out = scanelf_file_stack(elf, &found_stack, &found_relro); break; 1526 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; 1527 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1528 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; 1529 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1530 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1531 case 'D': out = get_endian(elf); break;
1532 case 'O': out = strfileperms(elf->filename); break;
1533 case 'n':
427 case 'n': scanelf_file_needed(elf, &found_needed, &out_buffer, &out_len); break; 1534 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; 1535 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1536 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1537 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
429 case 's': out = scanelf_file_sym(elf, &found_sym, filename); break; 1538 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1539 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1540 case 'a': out = get_elfemtype(elf); break;
1541 case 'I': out = get_elfosabi(elf); break;
1542 case 'Y': out = get_elf_eabi(elf); break;
1543 case 'Z': snprintf(ubuf, sizeof(ubuf), "%lu", (unsigned long)elf->len); out = ubuf; break;;
1544 default: warnf("'%c' has no scan code?", out_format[i]);
430 } 1545 }
1546 if (out)
431 if (out) xstrcat(&out_buffer, out, &out_len); 1547 xstrcat(&out_buffer, out, &out_len);
432 } 1548 }
433 1549
434 if (!found_file) { 1550#define FOUND_SOMETHING() \
435 if (!be_quiet || found_pax || found_stack || found_textrel || \ 1551 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
436 found_rpath || found_needed || found_interp || found_sym) 1552 found_rpath || found_needed || found_interp || found_bind || \
1553 found_soname || found_sym || found_lib || found_textrels || found_section )
1554
1555 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1556 xchrcat(&out_buffer, ' ', &out_len);
437 xstrcat(&out_buffer, filename, &out_len); 1557 xstrcat(&out_buffer, elf->filename, &out_len);
438 } 1558 }
439 if (!(be_quiet && xemptybuffer(out_buffer))) 1559 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
440 puts(out_buffer); 1560 puts(out_buffer);
1561 fflush(stdout);
1562 }
441 1563
1564 return 0;
1565}
1566
1567/* scan a single elf */
1568static int scanelf_elf(const char *filename, int fd, size_t len)
1569{
1570 int ret = 1;
1571 elfobj *elf;
1572
1573 /* verify this is real ELF */
1574 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1575 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1576 return 2;
1577 }
1578 switch (match_bits) {
1579 case 32:
1580 if (elf->elf_class != ELFCLASS32)
1581 goto label_done;
1582 break;
1583 case 64:
1584 if (elf->elf_class != ELFCLASS64)
1585 goto label_done;
1586 break;
1587 default: break;
1588 }
1589 if (match_etypes) {
1590 char sbuf[126];
1591 strncpy(sbuf, match_etypes, sizeof(sbuf));
1592 if (strchr(match_etypes, ',') != NULL) {
1593 char *p;
1594 while ((p = strrchr(sbuf, ',')) != NULL) {
1595 *p = 0;
1596 if (etype_lookup(p+1) == get_etype(elf))
1597 goto label_ret;
1598 }
1599 }
1600 if (etype_lookup(sbuf) != get_etype(elf))
1601 goto label_done;
1602 }
1603
1604label_ret:
1605 ret = scanelf_elfobj(elf);
1606
1607label_done:
442 unreadelf(elf); 1608 unreadelf(elf);
1609 return ret;
1610}
1611
1612/* scan an archive of elfs */
1613static int scanelf_archive(const char *filename, int fd, size_t len)
1614{
1615 archive_handle *ar;
1616 archive_member *m;
1617 char *ar_buffer;
1618 elfobj *elf;
1619
1620 ar = ar_open_fd(filename, fd);
1621 if (ar == NULL)
1622 return 1;
1623
1624 ar_buffer = mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1625 while ((m = ar_next(ar)) != NULL) {
1626 off_t cur_pos = lseek(fd, 0, SEEK_CUR);
1627 if (cur_pos == -1)
1628 errp("lseek() failed");
1629 elf = readelf_buffer(m->name, ar_buffer + cur_pos, m->size);
1630 if (elf) {
1631 scanelf_elfobj(elf);
1632 unreadelf(elf);
1633 }
1634 }
1635 munmap(ar_buffer, len);
1636
1637 return 0;
1638}
1639/* scan a file which may be an elf or an archive or some other magical beast */
1640static int scanelf_fileat(int dir_fd, const char *filename, const struct stat *st_cache)
1641{
1642 const struct stat *st = st_cache;
1643 struct stat symlink_st;
1644 int fd;
1645
1646 /* always handle regular files and handle symlinked files if no -y */
1647 if (S_ISLNK(st->st_mode)) {
1648 if (!scan_symlink)
1649 return 1;
1650 fstatat(dir_fd, filename, &symlink_st, 0);
1651 st = &symlink_st;
1652 }
1653
1654 if (!S_ISREG(st->st_mode)) {
1655 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1656 return 1;
1657 }
1658
1659 if (match_perms) {
1660 if ((st->st_mode | match_perms) != st->st_mode)
1661 return 1;
1662 }
1663 fd = openat(dir_fd, filename, (fix_elf ? O_RDWR : O_RDONLY) | O_CLOEXEC);
1664 if (fd == -1) {
1665 if (fix_elf && errno == ETXTBSY)
1666 warnp("%s: could not fix", filename);
1667 else if (be_verbose > 2)
1668 printf("%s: skipping file: %s\n", filename, strerror(errno));
1669 return 1;
1670 }
1671
1672 if (scanelf_elf(filename, fd, st->st_size) == 2) {
1673 /* if it isn't an ELF, maybe it's an .a archive */
1674 if (scan_archives)
1675 scanelf_archive(filename, fd, st->st_size);
1676
1677 /*
1678 * unreadelf() implicitly closes its fd, so only close it
1679 * when we are returning it in the non-ELF case
1680 */
1681 close(fd);
1682 }
1683
1684 return 0;
443} 1685}
444 1686
445/* scan a directory for ET_EXEC files and print when we find one */ 1687/* scan a directory for ET_EXEC files and print when we find one */
446static void scanelf_dir(const char *path) 1688static int scanelf_dirat(int dir_fd, const char *path)
447{ 1689{
448 register DIR *dir; 1690 register DIR *dir;
449 register struct dirent *dentry; 1691 register struct dirent *dentry;
450 struct stat st_top, st; 1692 struct stat st_top, st;
451 char buf[_POSIX_PATH_MAX]; 1693 char buf[__PAX_UTILS_PATH_MAX], *subpath;
452 size_t pathlen = 0, len = 0; 1694 size_t pathlen = 0, len = 0;
1695 int ret = 0;
1696 int subdir_fd;
453 1697
454 /* make sure path exists */ 1698 /* make sure path exists */
455 if (lstat(path, &st_top) == -1) { 1699 if (fstatat(dir_fd, path, &st_top, AT_SYMLINK_NOFOLLOW) == -1) {
456 if (be_verbose > 2) printf("%s: does not exist\n", path); 1700 if (be_verbose > 2) printf("%s: does not exist\n", path);
457 return; 1701 return 1;
458 } 1702 }
459 1703
460 /* ok, if it isn't a directory, assume we can open it */ 1704 /* ok, if it isn't a directory, assume we can open it */
461 if (!S_ISDIR(st_top.st_mode)) { 1705 if (!S_ISDIR(st_top.st_mode))
462 scanelf_file(path); 1706 return scanelf_fileat(dir_fd, path, &st_top);
463 return;
464 }
465 1707
466 /* now scan the dir looking for fun stuff */ 1708 /* now scan the dir looking for fun stuff */
467 if ((dir = opendir(path)) == NULL) { 1709 subdir_fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
468 warnf("could not opendir %s: %s", path, strerror(errno)); 1710 if (subdir_fd == -1)
1711 dir = NULL;
1712 else
1713 dir = fdopendir(subdir_fd);
1714 if (dir == NULL) {
1715 if (subdir_fd != -1)
1716 close(subdir_fd);
1717 warnfp("could not opendir(%s)", path);
469 return; 1718 return 1;
470 } 1719 }
471 if (be_verbose) printf("%s: scanning dir\n", path); 1720 if (be_verbose > 1) printf("%s: scanning dir\n", path);
472 1721
473 pathlen = strlen(path); 1722 subpath = stpcpy(buf, path);
1723 if (subpath[-1] != '/')
1724 *subpath++ = '/';
1725 pathlen = subpath - buf;
474 while ((dentry = readdir(dir))) { 1726 while ((dentry = readdir(dir))) {
475 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1727 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
476 continue; 1728 continue;
1729
1730 if (fstatat(subdir_fd, dentry->d_name, &st, AT_SYMLINK_NOFOLLOW) == -1)
1731 continue;
1732
477 len = (pathlen + 1 + strlen(dentry->d_name) + 1); 1733 len = strlen(dentry->d_name);
478 if (len >= sizeof(buf)) { 1734 if (len + pathlen + 1 >= sizeof(buf)) {
479 warnf("Skipping '%s': len > sizeof(buf); %d > %d\n", path, (int)len, (int)sizeof(buf)); 1735 warnf("Skipping '%s%s': len > sizeof(buf); %zu > %zu\n",
1736 path, dentry->d_name, len + pathlen + 1, sizeof(buf));
480 continue; 1737 continue;
481 } 1738 }
482 sprintf(buf, "%s/%s", path, dentry->d_name); 1739 memcpy(subpath, dentry->d_name, len);
483 if (lstat(buf, &st) != -1) { 1740 subpath[len] = '\0';
1741
484 if (S_ISREG(st.st_mode)) 1742 if (S_ISREG(st.st_mode))
485 scanelf_file(buf); 1743 ret = scanelf_fileat(dir_fd, buf, &st);
486 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1744 else if (dir_recurse && S_ISDIR(st.st_mode)) {
487 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1745 if (dir_crossmount || (st_top.st_dev == st.st_dev))
488 scanelf_dir(buf); 1746 ret = scanelf_dirat(dir_fd, buf);
1747 }
1748 }
1749 closedir(dir);
1750
1751 return ret;
1752}
1753static int scanelf_dir(const char *path)
1754{
1755 return scanelf_dirat(root_fd, root_rel_path(path));
1756}
1757
1758static int scanelf_from_file(const char *filename)
1759{
1760 FILE *fp;
1761 char *p, *path;
1762 size_t len;
1763 int ret;
1764
1765 if (strcmp(filename, "-") == 0)
1766 fp = stdin;
1767 else if ((fp = fopen(filename, "r")) == NULL)
1768 return 1;
1769
1770 path = NULL;
1771 len = 0;
1772 ret = 0;
1773 while (getline(&path, &len, fp) != -1) {
1774 if ((p = strchr(path, '\n')) != NULL)
1775 *p = 0;
1776 search_path = path;
1777 ret = scanelf_dir(path);
1778 }
1779 free(path);
1780
1781 if (fp != stdin)
1782 fclose(fp);
1783
1784 return ret;
1785}
1786
1787#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1788
1789static int _load_ld_cache_config(const char *fname)
1790{
1791 FILE *fp = NULL;
1792 char *p, *path;
1793 size_t len;
1794 int curr_fd = -1;
1795
1796 fp = fopenat_r(root_fd, root_rel_path(fname));
1797 if (fp == NULL)
1798 return -1;
1799
1800 path = NULL;
1801 len = 0;
1802 while (getline(&path, &len, fp) != -1) {
1803 if ((p = strrchr(path, '\r')) != NULL)
1804 *p = 0;
1805 if ((p = strchr(path, '\n')) != NULL)
1806 *p = 0;
1807
1808 /* recursive includes of the same file will make this segfault. */
1809 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1810 glob_t gl;
1811 size_t x;
1812 const char *gpath;
1813
1814 /* re-use existing path buffer ... need to be creative */
1815 if (path[8] != '/')
1816 gpath = memcpy(path + 3, "/etc/", 5);
1817 else
1818 gpath = path + 8;
1819 if (root_fd != AT_FDCWD) {
1820 if (curr_fd == -1) {
1821 curr_fd = open(".", O_RDONLY|O_CLOEXEC);
1822 if (fchdir(root_fd))
1823 errp("unable to change to root dir");
1824 }
1825 gpath = root_rel_path(gpath);
489 } 1826 }
1827
1828 if (glob(gpath, 0, NULL, &gl) == 0) {
1829 for (x = 0; x < gl.gl_pathc; ++x) {
1830 /* try to avoid direct loops */
1831 if (strcmp(gl.gl_pathv[x], fname) == 0)
1832 continue;
1833 _load_ld_cache_config(gl.gl_pathv[x]);
1834 }
1835 globfree(&gl);
1836 }
1837
1838 /* failed globs are ignored by glibc */
1839 continue;
490 } 1840 }
1841
1842 if (*path != '/')
1843 continue;
1844
1845 xarraypush_str(ldpaths, path);
1846 }
1847 free(path);
1848
1849 fclose(fp);
1850
1851 if (curr_fd != -1) {
1852 if (fchdir(curr_fd))
1853 /* don't care */;
1854 close(curr_fd);
1855 }
1856
1857 return 0;
1858}
1859
1860#elif defined(__FreeBSD__) || defined(__DragonFly__)
1861
1862static int _load_ld_cache_config(const char *fname)
1863{
1864 FILE *fp = NULL;
1865 char *b = NULL, *p;
1866 struct elfhints_hdr hdr;
1867
1868 fp = fopenat_r(root_fd, root_rel_path(fname));
1869 if (fp == NULL)
1870 return -1;
1871
1872 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1873 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1874 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1875 {
1876 fclose(fp);
1877 return -1;
1878 }
1879
1880 b = xmalloc(hdr.dirlistlen + 1);
1881 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1882 fclose(fp);
1883 free(b);
1884 return -1;
1885 }
1886
1887 while ((p = strsep(&b, ":"))) {
1888 if (*p == '\0')
1889 continue;
1890 xarraypush_str(ldpaths, p);
1891 }
1892
1893 free(b);
1894 fclose(fp);
1895 return 0;
1896}
1897
1898#else
1899#ifdef __ELF__
1900#warning Cache config support not implemented for your target
1901#endif
1902static int _load_ld_cache_config(const char *fname)
1903{
1904 return 0;
1905}
1906#endif
1907
1908static void load_ld_cache_config(const char *fname)
1909{
1910 bool scan_l, scan_ul, scan_ull;
1911 size_t n;
1912 const char *ldpath;
1913
1914 _load_ld_cache_config(fname);
1915
1916 scan_l = scan_ul = scan_ull = false;
1917 if (array_cnt(ldpaths)) {
1918 array_for_each(ldpaths, n, ldpath) {
1919 if (!scan_l && !strcmp(ldpath, "/lib")) scan_l = true;
1920 if (!scan_ul && !strcmp(ldpath, "/usr/lib")) scan_ul = true;
1921 if (!scan_ull && !strcmp(ldpath, "/usr/local/lib")) scan_ull = true;
491 } 1922 }
492 closedir(dir); 1923 }
1924
1925 if (!scan_l) xarraypush_str(ldpaths, "/lib");
1926 if (!scan_ul) xarraypush_str(ldpaths, "/usr/lib");
1927 if (!scan_ull) xarraypush_str(ldpaths, "/usr/local/lib");
493} 1928}
494 1929
495/* scan /etc/ld.so.conf for paths */ 1930/* scan /etc/ld.so.conf for paths */
496static void scanelf_ldpath() 1931static void scanelf_ldpath(void)
497{ 1932{
498 char scan_l, scan_ul, scan_ull; 1933 size_t n;
499 char *path, *p; 1934 const char *ldpath;
500 FILE *fp;
501 1935
502 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1936 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); 1937 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} 1938}
526 1939
527/* scan env PATH for paths */ 1940/* scan env PATH for paths */
528static void scanelf_envpath() 1941static void scanelf_envpath(void)
529{ 1942{
530 char *path, *p; 1943 char *path, *p;
531 1944
532 path = getenv("PATH"); 1945 path = getenv("PATH");
533 if (!path) 1946 if (!path)
540 } 1953 }
541 1954
542 free(path); 1955 free(path);
543} 1956}
544 1957
545 1958/* 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" 1959#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZCBhV"
549#define a_argument required_argument 1960#define a_argument required_argument
550static struct option const long_opts[] = { 1961static struct option const long_opts[] = {
551 {"path", no_argument, NULL, 'p'}, 1962 {"path", no_argument, NULL, 'p'},
552 {"ldpath", no_argument, NULL, 'l'}, 1963 {"ldpath", no_argument, NULL, 'l'},
1964 {"use-ldpath",no_argument, NULL, 129},
1965 {"root", a_argument, NULL, 128},
553 {"recursive", no_argument, NULL, 'R'}, 1966 {"recursive", no_argument, NULL, 'R'},
554 {"mount", no_argument, NULL, 'm'}, 1967 {"mount", no_argument, NULL, 'm'},
555 {"symlink", no_argument, NULL, 'y'}, 1968 {"symlink", no_argument, NULL, 'y'},
1969 {"archives", no_argument, NULL, 'A'},
1970 {"ldcache", no_argument, NULL, 'L'},
1971 {"fix", no_argument, NULL, 'X'},
1972 {"setpax", a_argument, NULL, 'z'},
556 {"pax", no_argument, NULL, 'x'}, 1973 {"pax", no_argument, NULL, 'x'},
557 {"header", no_argument, NULL, 'e'}, 1974 {"header", no_argument, NULL, 'e'},
558 {"textrel", no_argument, NULL, 't'}, 1975 {"textrel", no_argument, NULL, 't'},
559 {"rpath", no_argument, NULL, 'r'}, 1976 {"rpath", no_argument, NULL, 'r'},
560 {"needed", no_argument, NULL, 'n'}, 1977 {"needed", no_argument, NULL, 'n'},
561 {"interp", no_argument, NULL, 'i'}, 1978 {"interp", no_argument, NULL, 'i'},
1979 {"bind", no_argument, NULL, 'b'},
1980 {"soname", no_argument, NULL, 'S'},
562 {"symbol", a_argument, NULL, 's'}, 1981 {"symbol", a_argument, NULL, 's'},
1982 {"section", a_argument, NULL, 'k'},
1983 {"lib", a_argument, NULL, 'N'},
1984 {"gmatch", no_argument, NULL, 'g'},
1985 {"textrels", no_argument, NULL, 'T'},
1986 {"etype", a_argument, NULL, 'E'},
1987 {"bits", a_argument, NULL, 'M'},
1988 {"endian", no_argument, NULL, 'D'},
1989 {"osabi", no_argument, NULL, 'I'},
1990 {"eabi", no_argument, NULL, 'Y'},
1991 {"perms", a_argument, NULL, 'O'},
1992 {"size", no_argument, NULL, 'Z'},
563 {"all", no_argument, NULL, 'a'}, 1993 {"all", no_argument, NULL, 'a'},
564 {"quiet", no_argument, NULL, 'q'}, 1994 {"quiet", no_argument, NULL, 'q'},
565 {"verbose", no_argument, NULL, 'v'}, 1995 {"verbose", no_argument, NULL, 'v'},
566 {"format", a_argument, NULL, 'F'}, 1996 {"format", a_argument, NULL, 'F'},
1997 {"from", a_argument, NULL, 'f'},
567 {"file", a_argument, NULL, 'o'}, 1998 {"file", a_argument, NULL, 'o'},
1999 {"nocolor", no_argument, NULL, 'C'},
568 {"nobanner", no_argument, NULL, 'B'}, 2000 {"nobanner", no_argument, NULL, 'B'},
569 {"help", no_argument, NULL, 'h'}, 2001 {"help", no_argument, NULL, 'h'},
570 {"version", no_argument, NULL, 'V'}, 2002 {"version", no_argument, NULL, 'V'},
571 {NULL, no_argument, NULL, 0x0} 2003 {NULL, no_argument, NULL, 0x0}
572}; 2004};
2005
573static char *opts_help[] = { 2006static const char * const opts_help[] = {
574 "Scan all directories in PATH environment", 2007 "Scan all directories in PATH environment",
575 "Scan all directories in /etc/ld.so.conf", 2008 "Scan all directories in /etc/ld.so.conf",
2009 "Use ld.so.conf to show full path (use with -r/-n)",
2010 "Root directory (use with -l or -p)",
576 "Scan directories recursively", 2011 "Scan directories recursively",
577 "Don't recursively cross mount points", 2012 "Don't recursively cross mount points",
578 "Don't scan symlinks\n", 2013 "Don't scan symlinks",
2014 "Scan archives (.a files)",
2015 "Utilize ld.so.cache to show full path (use with -r/-n)",
2016 "Try and 'fix' bad things (use with -r/-e)",
2017 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
579 "Print PaX markings", 2018 "Print PaX markings",
580 "Print GNU_STACK markings", 2019 "Print GNU_STACK/PT_LOAD markings",
581 "Print TEXTREL information", 2020 "Print TEXTREL information",
582 "Print RPATH information", 2021 "Print RPATH information",
583 "Print NEEDED information", 2022 "Print NEEDED information",
584 "Print INTERP information", 2023 "Print INTERP information",
2024 "Print BIND information",
2025 "Print SONAME information",
585 "Find a specified symbol", 2026 "Find a specified symbol",
586 "Print all scanned info (-x -e -t -r)\n", 2027 "Find a specified section",
2028 "Find a specified library",
2029 "Use regex matching rather than string compare (use with -s)",
2030 "Locate cause of TEXTREL",
2031 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
2032 "Print only ELF files matching numeric bits",
2033 "Print Endianness",
2034 "Print OSABI",
2035 "Print EABI (EM_ARM Only)",
2036 "Print only ELF files matching octal permissions",
2037 "Print ELF file size",
2038 "Print all useful/simple info\n",
587 "Only output 'bad' things", 2039 "Only output 'bad' things",
588 "Be verbose (can be specified more than once)", 2040 "Be verbose (can be specified more than once)",
589 "Use specified format for output", 2041 "Use specified format for output",
2042 "Read input stream from a filename",
590 "Write output stream to a filename", 2043 "Write output stream to a filename",
2044 "Don't emit color in output",
591 "Don't display the header", 2045 "Don't display the header",
592 "Print this help and exit", 2046 "Print this help and exit",
593 "Print version and exit", 2047 "Print version and exit",
594 NULL 2048 NULL
595}; 2049};
596 2050
597/* display usage and exit */ 2051/* display usage and exit */
598static void usage(int status) 2052static void usage(int status)
599{ 2053{
600 unsigned long i; 2054 unsigned long i;
601 printf(" Scan ELF binaries for stuff\n\n" 2055 printf("* Scan ELF binaries for stuff\n\n"
602 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0); 2056 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
603 printf("Options: -[%s]\n", PARSE_FLAGS); 2057 printf("Options: -[%s]\n", PARSE_FLAGS);
604 for (i = 0; long_opts[i].name; ++i) 2058 for (i = 0; long_opts[i].name; ++i) {
2059 /* first output the short flag if it has one */
2060 if (long_opts[i].val > '~')
2061 printf(" ");
2062 else
2063 printf(" -%c, ", long_opts[i].val);
2064
2065 /* then the long flag */
605 if (long_opts[i].has_arg == no_argument) 2066 if (long_opts[i].has_arg == no_argument)
606 printf(" -%c, --%-13s %s\n", long_opts[i].val, 2067 printf("--%-14s", long_opts[i].name);
607 long_opts[i].name, opts_help[i]);
608 else 2068 else
609 printf(" -%c, --%-6s <arg> %s\n", long_opts[i].val, 2069 printf("--%-7s <arg> ", long_opts[i].name);
610 long_opts[i].name, opts_help[i]); 2070
2071 /* finally the help text */
2072 printf("* %s\n", opts_help[i]);
2073 }
2074
2075 puts("\nFor more information, see the scanelf(1) manpage");
611 exit(status); 2076 exit(status);
612} 2077}
613 2078
614/* parse command line arguments and preform needed actions */ 2079/* parse command line arguments and preform needed actions */
2080#define do_pax_state(option, flag) \
2081 if (islower(option)) { \
2082 flags &= ~PF_##flag; \
2083 flags |= PF_NO##flag; \
2084 } else { \
2085 flags &= ~PF_NO##flag; \
2086 flags |= PF_##flag; \
2087 }
615static void parseargs(int argc, char *argv[]) 2088static int parseargs(int argc, char *argv[])
616{ 2089{
617 int flag; 2090 int i;
2091 const char *from_file = NULL;
2092 int ret = 0;
2093 char load_cache_config = 0;
618 2094
619 opterr = 0; 2095 opterr = 0;
620 while ((flag=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 2096 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
621 switch (flag) { 2097 switch (i) {
622 2098
623 case 'V': 2099 case 'V':
624 printf("%s compiled %s\n%s\n" 2100 printf("pax-utils-%s: %s compiled %s\n%s\n"
625 "%s written for Gentoo Linux by <solar and vapier @ gentoo.org>\n", 2101 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
626 __FILE__, __DATE__, rcsid, argv0); 2102 VERSION, __FILE__, __DATE__, rcsid, argv0);
627 exit(EXIT_SUCCESS); 2103 exit(EXIT_SUCCESS);
628 break; 2104 break;
629 case 'h': usage(EXIT_SUCCESS); break; 2105 case 'h': usage(EXIT_SUCCESS); break;
630 2106 case 'f':
2107 if (from_file) warn("You prob don't want to specify -f twice");
2108 from_file = optarg;
2109 break;
2110 case 'E':
2111 match_etypes = optarg;
2112 break;
2113 case 'M':
2114 match_bits = atoi(optarg);
2115 if (match_bits == 0) {
2116 if (strcmp(optarg, "ELFCLASS32") == 0)
2117 match_bits = 32;
2118 if (strcmp(optarg, "ELFCLASS64") == 0)
2119 match_bits = 64;
2120 }
2121 break;
2122 case 'O':
2123 if (sscanf(optarg, "%o", &match_perms) == -1)
2124 match_bits = 0;
2125 break;
631 case 'o': { 2126 case 'o': {
632 FILE *fp = NULL;
633 fp = freopen(optarg, "w", stdout); 2127 if (freopen(optarg, "w", stdout) == NULL)
634 if (fp == NULL) 2128 errp("Could not freopen(%s)", optarg);
635 err("Could not open output stream '%s': %s", optarg, strerror(errno));
636 stdout = fp;
637 break; 2129 break;
638 } 2130 }
639 2131 case 'k':
2132 xarraypush_str(find_section_arr, optarg);
2133 break;
640 case 's': { 2134 case 's': {
641 size_t len; 2135 if (find_sym) warn("You prob don't want to specify -s twice");
642 find_sym = xstrdup(optarg); 2136 find_sym = 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; 2137 break;
647 } 2138 }
648 2139 case 'N':
2140 xarraypush_str(find_lib_arr, optarg);
2141 break;
649 case 'F': { 2142 case 'F': {
2143 if (out_format) warn("You prob don't want to specify -F twice");
650 out_format = strdup(optarg); 2144 out_format = optarg;
651 break; 2145 break;
652 } 2146 }
2147 case 'z': {
2148 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
2149 size_t x;
653 2150
2151 for (x = 0; x < strlen(optarg); x++) {
2152 switch (optarg[x]) {
2153 case 'p':
2154 case 'P':
2155 do_pax_state(optarg[x], PAGEEXEC);
2156 break;
2157 case 's':
2158 case 'S':
2159 do_pax_state(optarg[x], SEGMEXEC);
2160 break;
2161 case 'm':
2162 case 'M':
2163 do_pax_state(optarg[x], MPROTECT);
2164 break;
2165 case 'e':
2166 case 'E':
2167 do_pax_state(optarg[x], EMUTRAMP);
2168 break;
2169 case 'r':
2170 case 'R':
2171 do_pax_state(optarg[x], RANDMMAP);
2172 break;
2173 case 'x':
2174 case 'X':
2175 do_pax_state(optarg[x], RANDEXEC);
2176 break;
2177 default:
2178 break;
2179 }
2180 }
2181 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
2182 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
2183 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
2184 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
2185 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
2186 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
2187 setpax = flags;
2188 break;
2189 }
2190 case 'Z': show_size = 1; break;
2191 case 'g': g_match = 1; break;
2192 case 'L': load_cache_config = use_ldcache = 1; break;
654 case 'y': scan_symlink = 0; break; 2193 case 'y': scan_symlink = 0; break;
2194 case 'A': scan_archives = 1; break;
2195 case 'C': color_init(true); break;
655 case 'B': show_banner = 0; break; 2196 case 'B': show_banner = 0; break;
656 case 'l': scan_ldpath = 1; break; 2197 case 'l': load_cache_config = scan_ldpath = 1; break;
657 case 'p': scan_envpath = 1; break; 2198 case 'p': scan_envpath = 1; break;
658 case 'R': dir_recurse = 1; break; 2199 case 'R': dir_recurse = 1; break;
659 case 'm': dir_crossmount = 0; break; 2200 case 'm': dir_crossmount = 0; break;
2201 case 'X': ++fix_elf; break;
660 case 'x': show_pax = 1; break; 2202 case 'x': show_pax = 1; break;
661 case 'e': show_stack = 1; break; 2203 case 'e': show_phdr = 1; break;
662 case 't': show_textrel = 1; break; 2204 case 't': show_textrel = 1; break;
663 case 'r': show_rpath = 1; break; 2205 case 'r': show_rpath = 1; break;
664 case 'n': show_needed = 1; break; 2206 case 'n': show_needed = 1; break;
665 case 'i': show_interp = 1; break; 2207 case 'i': show_interp = 1; break;
2208 case 'b': show_bind = 1; break;
2209 case 'S': show_soname = 1; break;
2210 case 'T': show_textrels = 1; break;
666 case 'q': be_quiet = 1; break; 2211 case 'q': be_quiet = 1; break;
667 case 'v': be_verbose = (be_verbose % 20) + 1; break; 2212 case 'v': be_verbose = (be_verbose % 20) + 1; break;
668 case 'a': show_pax = show_stack = show_textrel = show_rpath = show_needed = show_interp = 1; break; 2213 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
669 2214 case 'D': show_endian = 1; break;
2215 case 'I': show_osabi = 1; break;
2216 case 'Y': show_eabi = 1; break;
2217 case 128:
2218 root_fd = open(optarg, O_RDONLY|O_CLOEXEC);
2219 if (root_fd == -1)
2220 err("Could not open root: %s", optarg);
2221 break;
2222 case 129: load_cache_config = use_ldpath = 1; break;
670 case ':': 2223 case ':':
671 warn("Option missing parameter\n"); 2224 err("Option '%c' is missing parameter", optopt);
672 usage(EXIT_FAILURE);
673 break;
674 case '?': 2225 case '?':
675 warn("Unknown option\n"); 2226 err("Unknown option '%c' or argument missing", optopt);
676 usage(EXIT_FAILURE);
677 break;
678 default: 2227 default:
679 err("Unhandled option '%c'", flag); 2228 err("Unhandled option '%c'; please report this", i);
680 break;
681 } 2229 }
682 } 2230 }
683 2231 if (show_textrels && be_verbose)
684 if (be_quiet && be_verbose) 2232 has_objdump = bin_in_path("objdump");
685 err("You can be quiet or you can be verbose, not both, stupid"); 2233 /* flatten arrays for display */
686 2234 if (array_cnt(find_lib_arr))
2235 find_lib = array_flatten_str(find_lib_arr);
2236 if (array_cnt(find_section_arr))
2237 find_section = array_flatten_str(find_section_arr);
687 /* let the format option override all other options */ 2238 /* let the format option override all other options */
688 if (out_format) { 2239 if (out_format) {
689 show_pax = show_stack = show_textrel = show_rpath = show_needed = show_interp = 0; 2240 show_pax = show_phdr = show_textrel = show_rpath = \
2241 show_needed = show_interp = show_bind = show_soname = \
2242 show_textrels = show_perms = show_endian = show_size = \
2243 show_osabi = show_eabi = 0;
690 for (flag=0; out_format[flag]; ++flag) { 2244 for (i = 0; out_format[i]; ++i) {
691 if (out_format[flag] != '%') continue; 2245 if (!IS_MODIFIER(out_format[i])) continue;
692 2246
693 switch (out_format[++flag]) { 2247 switch (out_format[++i]) {
2248 case '+': break;
694 case '%': break; 2249 case '%': break;
2250 case '#': break;
695 case 'F': break; 2251 case 'F': break;
2252 case 'p': break;
2253 case 'f': break;
2254 case 'k': break;
696 case 's': break; 2255 case 's': break;
2256 case 'N': break;
697 case 'o': break; 2257 case 'o': break;
2258 case 'a': break;
2259 case 'M': break;
2260 case 'Z': show_size = 1; break;
2261 case 'D': show_endian = 1; break;
2262 case 'I': show_osabi = 1; break;
2263 case 'Y': show_eabi = 1; break;
2264 case 'O': show_perms = 1; break;
698 case 'x': show_pax = 1; break; 2265 case 'x': show_pax = 1; break;
699 case 'e': show_stack = 1; break; 2266 case 'e': show_phdr = 1; break;
700 case 't': show_textrel = 1; break; 2267 case 't': show_textrel = 1; break;
701 case 'r': show_rpath = 1; break; 2268 case 'r': show_rpath = 1; break;
702 case 'n': show_needed = 1; break; 2269 case 'n': show_needed = 1; break;
703 case 'i': show_interp = 1; break; 2270 case 'i': show_interp = 1; break;
2271 case 'b': show_bind = 1; break;
2272 case 'S': show_soname = 1; break;
2273 case 'T': show_textrels = 1; break;
704 default: 2274 default:
705 err("Invalid format specifier '%c' (byte %i)", 2275 err("invalid format specifier '%c' (byte %i)",
706 out_format[flag], flag+1); 2276 out_format[i], i+1);
707 } 2277 }
708 } 2278 }
709 2279
710 /* construct our default format */ 2280 /* construct our default format */
711 } else { 2281 } else {
712 size_t fmt_len = 30; 2282 size_t fmt_len = 30;
713 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 2283 out_format = xmalloc(sizeof(char) * fmt_len);
2284 *out_format = '\0';
714 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 2285 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
715 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len); 2286 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
2287 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
2288 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
2289 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
716 if (show_stack) xstrcat(&out_format, "%e ", &fmt_len); 2290 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
2291 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
2292 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
717 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 2293 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
718 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 2294 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
719 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 2295 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
720 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 2296 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
2297 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
2298 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
2299 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
721 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len); 2300 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
2301 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
2302 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
722 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 2303 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
723 } 2304 }
724 if (be_verbose > 2) printf("Format: %s\n", out_format); 2305 if (be_verbose > 2) printf("Format: %s\n", out_format);
725 2306
726 /* now lets actually do the scanning */ 2307 /* now lets actually do the scanning */
2308 if (load_cache_config)
2309 load_ld_cache_config(__PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
727 if (scan_ldpath) scanelf_ldpath(); 2310 if (scan_ldpath) scanelf_ldpath();
728 if (scan_envpath) scanelf_envpath(); 2311 if (scan_envpath) scanelf_envpath();
2312 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
2313 from_file = "-";
2314 if (from_file) {
2315 scanelf_from_file(from_file);
2316 from_file = *argv;
2317 }
729 if (optind == argc && !scan_ldpath && !scan_envpath) 2318 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
730 err("Nothing to scan !?"); 2319 err("Nothing to scan !?");
731 while (optind < argc) 2320 while (optind < argc) {
732 scanelf_dir(argv[optind++]); 2321 search_path = argv[optind++];
2322 ret = scanelf_dir(search_path);
2323 }
733 2324
734 /* clean up */ 2325 /* clean up */
735 if (find_sym) { 2326 xarrayfree(ldpaths);
2327 xarrayfree(find_lib_arr);
2328 xarrayfree(find_section_arr);
736 free(find_sym); 2329 free(find_lib);
737 free(versioned_symname); 2330 free(find_section);
738 }
739 if (out_format) free(out_format);
740}
741 2331
742 2332 if (ldcache != 0)
743 2333 munmap(ldcache, ldcache_size);
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; 2334 return ret;
750} 2335}
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 2336
761 new_len = strlen(*dst) + strlen(src); 2337static 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{ 2338{
773 static char my_app[2]; 2339 const char *delims = " \t\n";
774 my_app[0] = append; 2340 char **envvals = NULL;
775 my_app[1] = '\0'; 2341 char *env, *s;
776 xstrcat(dst, my_app, curr_len); 2342 int nentry;
777} 2343
778static int xemptybuffer(const char *buff) 2344 if ((env = getenv(envvar)) == NULL)
779{
780 long i;
781 for (i=0; buff[i]; ++i)
782 if (buff[i] != ' ')
783 return 0; 2345 return NULL;
2346
2347 env = xstrdup(env);
2348 if (env == NULL)
784 return 1; 2349 return NULL;
785}
786 2350
2351 s = strtok(env, delims);
2352 if (s == NULL) {
2353 free(env);
2354 return NULL;
2355 }
787 2356
2357 nentry = 0;
2358 while (s != NULL) {
2359 ++nentry;
2360 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
2361 envvals[nentry-1] = s;
2362 s = strtok(NULL, delims);
2363 }
2364 envvals[nentry] = NULL;
2365
2366 /* don't want to free(env) as it contains the memory that backs
2367 * the envvals array of strings */
2368 return envvals;
2369}
2370
2371static void parseenv(void)
2372{
2373 color_init(false);
2374 qa_textrels = get_split_env("QA_TEXTRELS");
2375 qa_execstack = get_split_env("QA_EXECSTACK");
2376 qa_wx_load = get_split_env("QA_WX_LOAD");
2377}
2378
2379#ifdef __PAX_UTILS_CLEANUP
2380static void cleanup(void)
2381{
2382 free(out_format);
2383 free(qa_textrels);
2384 free(qa_execstack);
2385 free(qa_wx_load);
2386}
2387#endif
788 2388
789int main(int argc, char *argv[]) 2389int main(int argc, char *argv[])
790{ 2390{
2391 int ret;
791 if (argc < 2) 2392 if (argc < 2)
792 usage(EXIT_FAILURE); 2393 usage(EXIT_FAILURE);
2394 parseenv();
793 parseargs(argc, argv); 2395 ret = parseargs(argc, argv);
794 fclose(stdout); 2396 fclose(stdout);
795 return EXIT_SUCCESS; 2397#ifdef __PAX_UTILS_CLEANUP
2398 cleanup();
2399 warn("The calls to add/delete heap should be off:\n"
2400 "\t- 1 due to the out_buffer not being freed in scanelf_fileat()\n"
2401 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
2402#endif
2403 return ret;
796} 2404}
2405
2406/* Match filename against entries in matchlist, return TRUE
2407 * if the file is listed */
2408static int file_matches_list(const char *filename, char **matchlist)
2409{
2410 char **file;
2411 char *match;
2412 char buf[__PAX_UTILS_PATH_MAX];
2413
2414 if (matchlist == NULL)
2415 return 0;
2416
2417 for (file = matchlist; *file != NULL; file++) {
2418 if (search_path) {
2419 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2420 match = buf;
2421 } else {
2422 match = *file;
2423 }
2424 if (fnmatch(match, filename, 0) == 0)
2425 return 1;
2426 }
2427 return 0;
2428}

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