/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.44 Revision 1.256
1/* 1/*
2 * Copyright 2003 Ned Ludd <solar@gentoo.org>
3 * Copyright 1999-2005 Gentoo Foundation 2 * Copyright 2003-2012 Gentoo Foundation
4 * Distributed under the terms of the GNU General Public License v2 3 * Distributed under the terms of the GNU General Public License v2
5 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.44 2005/05/10 22:54:25 vapier Exp $ 4 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.256 2013/04/08 06:38:42 vapier Exp $
6 * 5 *
7 ******************************************************************** 6 * Copyright 2003-2012 Ned Ludd - <solar@gentoo.org>
8 * This program is free software; you can redistribute it and/or 7 * Copyright 2004-2012 Mike Frysinger - <vapier@gentoo.org>
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of the
11 * License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
21 * MA 02111-1307, USA.
22 */ 8 */
23 9
24#include <stdio.h> 10static const char rcsid[] = "$Id: scanelf.c,v 1.256 2013/04/08 06:38:42 vapier Exp $";
25#include <stdlib.h> 11const char argv0[] = "scanelf";
26#include <sys/types.h>
27#define __USE_GNU
28#include <string.h>
29#include <errno.h>
30#include <unistd.h>
31#include <sys/stat.h>
32#include <dirent.h>
33#include <getopt.h>
34#include <assert.h>
35 12
36#include "paxelf.h" 13#include "paxinc.h"
37 14
38static const char *rcsid = "$Id: scanelf.c,v 1.44 2005/05/10 22:54:25 vapier Exp $"; 15#define IS_MODIFIER(c) (c == '%' || c == '#' || c == '+')
39#define argv0 "scanelf"
40
41
42 16
43/* prototypes */ 17/* prototypes */
44static void scanelf_file(const char *filename); 18static int file_matches_list(const char *filename, char **matchlist);
45static void scanelf_dir(const char *path);
46static void scanelf_ldpath();
47static void scanelf_envpath();
48static void usage(int status);
49static void parseargs(int argc, char *argv[]);
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 array_t _find_sym_arr = array_init_decl, *find_sym_arr = &_find_sym_arr;
50static array_t _find_sym_regex_arr = array_init_decl, *find_sym_regex_arr = &_find_sym_regex_arr;
51static char *find_lib = NULL;
52static array_t _find_lib_arr = array_init_decl, *find_lib_arr = &_find_lib_arr;
53static char *find_section = NULL;
54static array_t _find_section_arr = array_init_decl, *find_section_arr = &_find_section_arr;
72static char *out_format = NULL; 55static char *out_format = NULL;
56static char *search_path = NULL;
57static char fix_elf = 0;
58static char g_match = 0;
59static char use_ldcache = 0;
60static char use_ldpath = 0;
73 61
62static char **qa_textrels = NULL;
63static char **qa_execstack = NULL;
64static char **qa_wx_load = NULL;
65static int root_fd = AT_FDCWD;
74 66
67static int match_bits = 0;
68static unsigned int match_perms = 0;
69static void *ldcache = NULL;
70static size_t ldcache_size = 0;
71static unsigned long setpax = 0UL;
75 72
73static int has_objdump = 0;
74
75/* find the path to a file by name */
76static int bin_in_path(const char *fname)
77{
78 char fullpath[__PAX_UTILS_PATH_MAX];
79 char *path, *p;
80
81 path = getenv("PATH");
82 if (!path)
83 return 0;
84
85 while ((p = strrchr(path, ':')) != NULL) {
86 snprintf(fullpath, sizeof(fullpath), "%s/%s", p + 1, fname);
87 *p = 0;
88 if (access(fullpath, R_OK) != -1)
89 return 1;
90 }
91
92 return 0;
93}
94
95static FILE *fopenat_r(int dir_fd, const char *path)
96{
97 int fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
98 if (fd == -1)
99 return NULL;
100 return fdopen(fd, "re");
101}
102
103static const char *root_rel_path(const char *path)
104{
105 /*
106 * openat() will ignore the dirfd if path starts with
107 * a /, so consume all of that noise
108 *
109 * XXX: we don't handle relative paths like ../ that
110 * break out of the --root option, but for now, just
111 * don't do that :P.
112 */
113 if (root_fd != AT_FDCWD) {
114 while (*path == '/')
115 ++path;
116 if (*path == '\0')
117 path = ".";
118 }
119
120 return path;
121}
122
76/* sub-funcs for scanelf_file() */ 123/* sub-funcs for scanelf_fileat() */
124static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **str)
125{
126 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
127
128 /* debug sections */
129 void *symtab = elf_findsecbyname(elf, ".symtab");
130 void *strtab = elf_findsecbyname(elf, ".strtab");
131 /* runtime sections */
132 void *dynsym = elf_findsecbyname(elf, ".dynsym");
133 void *dynstr = elf_findsecbyname(elf, ".dynstr");
134
135 /*
136 * If the sections are marked NOBITS, then they don't exist, so we just
137 * skip them. This let's us work sanely with splitdebug ELFs (rather
138 * than spewing a lot of "corrupt ELF" messages later on). In malformed
139 * ELFs, the section might be wrongly set to NOBITS, but screw em.
140 */
141#define GET_SYMTABS(B) \
142 if (elf->elf_class == ELFCLASS ## B) { \
143 Elf ## B ## _Shdr *esymtab = symtab; \
144 Elf ## B ## _Shdr *estrtab = strtab; \
145 Elf ## B ## _Shdr *edynsym = dynsym; \
146 Elf ## B ## _Shdr *edynstr = dynstr; \
147 \
148 if (symtab && EGET(esymtab->sh_type) == SHT_NOBITS) \
149 symtab = NULL; \
150 if (dynsym && EGET(edynsym->sh_type) == SHT_NOBITS) \
151 dynsym = NULL; \
152 if (symtab && dynsym) \
153 *sym = (EGET(esymtab->sh_size) > EGET(edynsym->sh_size)) ? symtab : dynsym; \
154 else \
155 *sym = symtab ? symtab : dynsym; \
156 \
157 if (strtab && EGET(estrtab->sh_type) == SHT_NOBITS) \
158 strtab = NULL; \
159 if (dynstr && EGET(edynstr->sh_type) == SHT_NOBITS) \
160 dynstr = NULL; \
161 if (strtab && dynstr) \
162 *str = (EGET(estrtab->sh_size) > EGET(edynstr->sh_size)) ? strtab : dynstr; \
163 else \
164 *str = strtab ? strtab : dynstr; \
165 }
166 GET_SYMTABS(32)
167 GET_SYMTABS(64)
168
169 if (*sym && *str)
170 return;
171
172 /*
173 * damn, they're really going to make us work for it huh?
174 * reconstruct the section header info out of the dynamic
175 * tags so we can see what symbols this guy uses at runtime.
176 */
177#define GET_SYMTABS_DT(B) \
178 if (elf->elf_class == ELFCLASS ## B) { \
179 size_t i; \
180 static Elf ## B ## _Shdr sym_shdr, str_shdr; \
181 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
182 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
183 Elf ## B ## _Addr vsym, vstr, vhash, vgnu_hash; \
184 Elf ## B ## _Dyn *dyn; \
185 Elf ## B ## _Off offset; \
186 \
187 /* lookup symbols used at runtime with DT_SYMTAB / DT_STRTAB */ \
188 vsym = vstr = vhash = vgnu_hash = 0; \
189 memset(&sym_shdr, 0, sizeof(sym_shdr)); \
190 memset(&str_shdr, 0, sizeof(str_shdr)); \
191 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
192 if (EGET(phdr[i].p_type) != PT_DYNAMIC) \
193 continue; \
194 \
195 offset = EGET(phdr[i].p_offset); \
196 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
197 continue; \
198 \
199 dyn = DYN ## B (elf->vdata + offset); \
200 while (EGET(dyn->d_tag) != DT_NULL) { \
201 switch (EGET(dyn->d_tag)) { \
202 case DT_SYMTAB: vsym = EGET(dyn->d_un.d_val); break; \
203 case DT_SYMENT: sym_shdr.sh_entsize = dyn->d_un.d_val; break; \
204 case DT_STRTAB: vstr = EGET(dyn->d_un.d_val); break; \
205 case DT_STRSZ: str_shdr.sh_size = dyn->d_un.d_val; break; \
206 case DT_HASH: vhash = EGET(dyn->d_un.d_val); break; \
207 /*case DT_GNU_HASH: vgnu_hash = EGET(dyn->d_un.d_val); break;*/ \
208 } \
209 ++dyn; \
210 } \
211 if (vsym && vstr) \
212 break; \
213 } \
214 if (!vsym || !vstr || !(vhash || vgnu_hash)) \
215 return; \
216 \
217 /* calc offset into the ELF by finding the load addr of the syms */ \
218 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
219 Elf ## B ## _Addr vaddr = EGET(phdr[i].p_vaddr); \
220 Elf ## B ## _Addr filesz = EGET(phdr[i].p_filesz); \
221 offset = EGET(phdr[i].p_offset); \
222 \
223 if (EGET(phdr[i].p_type) != PT_LOAD) \
224 continue; \
225 \
226 if (vhash >= vaddr && vhash < vaddr + filesz) { \
227 /* Scan the hash table to see how many entries we have */ \
228 Elf32_Word max_sym_idx = 0; \
229 Elf32_Word *hashtbl = elf->vdata + offset + (vhash - vaddr); \
230 Elf32_Word b, nbuckets = EGET(hashtbl[0]); \
231 Elf32_Word nchains = EGET(hashtbl[1]); \
232 Elf32_Word *buckets = &hashtbl[2]; \
233 Elf32_Word *chains = &buckets[nbuckets]; \
234 Elf32_Word sym_idx; \
235 \
236 for (b = 0; b < nbuckets; ++b) { \
237 if (!buckets[b]) \
238 continue; \
239 for (sym_idx = buckets[b]; sym_idx < nchains && sym_idx; sym_idx = chains[sym_idx]) \
240 if (max_sym_idx < sym_idx) \
241 max_sym_idx = sym_idx; \
242 } \
243 ESET(sym_shdr.sh_size, sym_shdr.sh_entsize * max_sym_idx); \
244 } \
245 \
246 if (vsym >= vaddr && vsym < vaddr + filesz) { \
247 ESET(sym_shdr.sh_offset, offset + (vsym - vaddr)); \
248 *sym = &sym_shdr; \
249 } \
250 \
251 if (vstr >= vaddr && vstr < vaddr + filesz) { \
252 ESET(str_shdr.sh_offset, offset + (vstr - vaddr)); \
253 *str = &str_shdr; \
254 } \
255 } \
256 }
257 GET_SYMTABS_DT(32)
258 GET_SYMTABS_DT(64)
259}
260
77static char *scanelf_file_pax(elfobj *elf, char *found_pax) 261static char *scanelf_file_pax(elfobj *elf, char *found_pax)
78{ 262{
79 static char *paxflags; 263 static char ret[7];
264 unsigned long i, shown;
80 265
81 if (!show_pax) return NULL; 266 if (!show_pax) return NULL;
82 267
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; 268 shown = 0;
100 strcpy(ret, "--- ---"); 269 memset(&ret, 0, sizeof(ret));
101 270
102 if (elf->phdr) { 271 if (elf->phdr) {
103#define SHOW_STACK(B) \ 272#define SHOW_PAX(B) \
104 if (elf->elf_class == ELFCLASS ## B) { \ 273 if (elf->elf_class == ELFCLASS ## B) { \
105 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 274 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
106 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 275 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
107 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 276 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
108 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \ 277 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; \ 278 continue; \
116 if (be_quiet && !(EGET(phdr[i].p_flags) & PF_X)) \ 279 if (fix_elf && setpax) { \
280 /* set the paxctl flags */ \
281 ESET(phdr[i].p_flags, setpax); \
282 } \
283 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
117 continue; \ 284 continue; \
118 memcpy(ret+off, gnu_short_stack_flags(EGET(phdr[i].p_flags)), 3); \ 285 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
119 *found = 1; \ 286 *found_pax = 1; \
120 ++shown; \ 287 ++shown; \
288 break; \
121 } \ 289 } \
122 } 290 }
123 SHOW_STACK(32) 291 SHOW_PAX(32)
124 SHOW_STACK(64) 292 SHOW_PAX(64)
293 }
294
295 /* Note: We do not support setting EI_PAX if not PT_PAX_FLAGS
296 * was found. This is known to break ELFs on glibc systems,
297 * and mainline PaX has deprecated use of this for a long time.
298 * We could support changing PT_GNU_STACK, but that doesn't
299 * seem like it's worth the effort. #411919
300 */
301
302 /* fall back to EI_PAX if no PT_PAX was found */
303 if (!*ret) {
304 static char *paxflags;
305 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
306 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
307 *found_pax = 1;
308 return (be_wewy_wewy_quiet ? NULL : paxflags);
125 } 309 }
310 strncpy(ret, paxflags, sizeof(ret));
311 }
126 312
127 if (be_quiet && !shown) 313 if (be_wewy_wewy_quiet || (be_quiet && !shown))
128 return NULL; 314 return NULL;
129 else 315 else
130 return ret; 316 return ret;
131} 317}
318
319static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
320{
321 static char ret[12];
322 char *found;
323 unsigned long i, shown, multi_stack, multi_relro, multi_load;
324
325 if (!show_phdr) return NULL;
326
327 memcpy(ret, "--- --- ---\0", 12);
328
329 shown = 0;
330 multi_stack = multi_relro = multi_load = 0;
331
332#define NOTE_GNU_STACK ".note.GNU-stack"
333#define SHOW_PHDR(B) \
334 if (elf->elf_class == ELFCLASS ## B) { \
335 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
336 Elf ## B ## _Off offset; \
337 uint32_t flags, check_flags; \
338 if (elf->phdr != NULL) { \
339 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
340 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
341 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
342 if (multi_stack++) \
343 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
344 if (file_matches_list(elf->filename, qa_execstack)) \
345 continue; \
346 found = found_phdr; \
347 offset = 0; \
348 check_flags = PF_X; \
349 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
350 if (multi_relro++) \
351 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
352 found = found_relro; \
353 offset = 4; \
354 check_flags = PF_X; \
355 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
356 if (file_matches_list(elf->filename, qa_wx_load)) \
357 continue; \
358 found = found_load; \
359 offset = 8; \
360 check_flags = PF_W|PF_X; \
361 } else \
362 continue; \
363 flags = EGET(phdr[i].p_flags); \
364 if (be_quiet && ((flags & check_flags) != check_flags)) \
365 continue; \
366 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
367 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
368 ret[3] = ret[7] = '!'; \
369 flags = EGET(phdr[i].p_flags); \
370 } \
371 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
372 *found = 1; \
373 ++shown; \
374 } \
375 } else if (elf->shdr != NULL) { \
376 /* no program headers which means this is prob an object file */ \
377 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
378 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
379 char *str; \
380 if ((void*)strtbl > elf->data_end) \
381 goto skip_this_shdr##B; \
382 check_flags = SHF_WRITE|SHF_EXECINSTR; \
383 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
384 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
385 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
386 str = elf->data + offset; \
387 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
388 if (!strcmp(str, NOTE_GNU_STACK)) { \
389 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
390 flags = EGET(shdr[i].sh_flags); \
391 if (be_quiet && ((flags & check_flags) != check_flags)) \
392 continue; \
393 ++*found_phdr; \
394 shown = 1; \
395 if (flags & SHF_WRITE) ret[0] = 'W'; \
396 if (flags & SHF_ALLOC) ret[1] = 'A'; \
397 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
398 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
399 break; \
400 } \
401 } \
402 skip_this_shdr##B: \
403 if (!multi_stack) { \
404 if (file_matches_list(elf->filename, qa_execstack)) \
405 return NULL; \
406 *found_phdr = 1; \
407 shown = 1; \
408 memcpy(ret, "!WX", 3); \
409 } \
410 } \
411 }
412 SHOW_PHDR(32)
413 SHOW_PHDR(64)
414
415 if (be_wewy_wewy_quiet || (be_quiet && !shown))
416 return NULL;
417 else
418 return ret;
419}
420
421/*
422 * See if this ELF contains a DT_TEXTREL tag in any of its
423 * PT_DYNAMIC sections.
424 */
132static char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 425static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
133{ 426{
134 static char *ret = "TEXTREL"; 427 static const char *ret = "TEXTREL";
135 unsigned long i; 428 unsigned long i;
136 429
137 if (!show_textrel) return NULL; 430 if (!show_textrel && !show_textrels) return NULL;
431
432 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
138 433
139 if (elf->phdr) { 434 if (elf->phdr) {
140#define SHOW_TEXTREL(B) \ 435#define SHOW_TEXTREL(B) \
141 if (elf->elf_class == ELFCLASS ## B) { \ 436 if (elf->elf_class == ELFCLASS ## B) { \
142 Elf ## B ## _Dyn *dyn; \ 437 Elf ## B ## _Dyn *dyn; \
143 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 438 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
144 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 439 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
145 Elf ## B ## _Off offset; \ 440 Elf ## B ## _Off offset; \
146 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 441 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
147 if (phdr[i].p_type != PT_DYNAMIC) continue; \ 442 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
148 offset = EGET(phdr[i].p_offset); \ 443 offset = EGET(phdr[i].p_offset); \
149 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 444 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
150 dyn = DYN ## B (elf->data + offset); \ 445 dyn = DYN ## B (elf->vdata + offset); \
151 while (EGET(dyn->d_tag) != DT_NULL) { \ 446 while (EGET(dyn->d_tag) != DT_NULL) { \
152 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \ 447 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
153 *found_textrel = 1; \ 448 *found_textrel = 1; \
154 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \ 449 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
155 return ret; \ 450 return (be_wewy_wewy_quiet ? NULL : ret); \
156 } \ 451 } \
157 ++dyn; \ 452 ++dyn; \
158 } \ 453 } \
159 } } 454 } }
160 SHOW_TEXTREL(32) 455 SHOW_TEXTREL(32)
161 SHOW_TEXTREL(64) 456 SHOW_TEXTREL(64)
162 } 457 }
163 458
164 if (be_quiet) 459 if (be_quiet || be_wewy_wewy_quiet)
165 return NULL; 460 return NULL;
166 else 461 else
167 return " - "; 462 return " - ";
168} 463}
464
465/*
466 * Scan the .text section to see if there are any relocations in it.
467 * Should rewrite this to check PT_LOAD sections that are marked
468 * Executable rather than the section named '.text'.
469 */
470static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
471{
472 unsigned long s, r, rmax;
473 void *symtab_void, *strtab_void, *text_void;
474
475 if (!show_textrels) return NULL;
476
477 /* don't search for TEXTREL's if the ELF doesn't have any */
478 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
479 if (!*found_textrel) return NULL;
480
481 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
482 text_void = elf_findsecbyname(elf, ".text");
483
484 if (symtab_void && strtab_void && text_void && elf->shdr) {
485#define SHOW_TEXTRELS(B) \
486 if (elf->elf_class == ELFCLASS ## B) { \
487 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
488 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
489 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
490 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
491 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
492 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
493 uint ## B ## _t memsz = EGET(text->sh_size); \
494 Elf ## B ## _Rel *rel; \
495 Elf ## B ## _Rela *rela; \
496 /* search the section headers for relocations */ \
497 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
498 uint32_t sh_type = EGET(shdr[s].sh_type); \
499 if (sh_type == SHT_REL) { \
500 rel = REL ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
501 rela = NULL; \
502 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
503 } else if (sh_type == SHT_RELA) { \
504 rel = NULL; \
505 rela = RELA ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
506 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
507 } else \
508 continue; \
509 /* now see if any of the relocs are in the .text */ \
510 for (r = 0; r < rmax; ++r) { \
511 unsigned long sym_max; \
512 Elf ## B ## _Addr offset_tmp; \
513 Elf ## B ## _Sym *func; \
514 Elf ## B ## _Sym *sym; \
515 Elf ## B ## _Addr r_offset; \
516 uint ## B ## _t r_info; \
517 if (sh_type == SHT_REL) { \
518 r_offset = EGET(rel[r].r_offset); \
519 r_info = EGET(rel[r].r_info); \
520 } else { \
521 r_offset = EGET(rela[r].r_offset); \
522 r_info = EGET(rela[r].r_info); \
523 } \
524 /* make sure this relocation is inside of the .text */ \
525 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
526 if (be_verbose <= 2) continue; \
527 } else \
528 *found_textrels = 1; \
529 /* locate this relocation symbol name */ \
530 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
531 if ((void*)sym > elf->data_end) { \
532 warn("%s: corrupt ELF symbol", elf->filename); \
533 continue; \
534 } \
535 sym_max = ELF ## B ## _R_SYM(r_info); \
536 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
537 sym += sym_max; \
538 else \
539 sym = NULL; \
540 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
541 /* show the raw details about this reloc */ \
542 printf(" %s: ", elf->base_filename); \
543 if (sym && sym->st_name) \
544 printf("%s", elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
545 else \
546 printf("(memory/data?)"); \
547 printf(" [0x%lX]", (unsigned long)r_offset); \
548 /* now try to find the closest symbol that this rel is probably in */ \
549 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
550 func = NULL; \
551 offset_tmp = 0; \
552 while (sym_max--) { \
553 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
554 func = sym; \
555 offset_tmp = EGET(sym->st_value); \
556 } \
557 ++sym; \
558 } \
559 printf(" in "); \
560 if (func && func->st_name) { \
561 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
562 if (r_offset > EGET(func->st_size)) \
563 printf("(optimized out: previous %s)", func_name); \
564 else \
565 printf("%s", func_name); \
566 } else \
567 printf("(optimized out)"); \
568 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
569 if (be_verbose && has_objdump) { \
570 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
571 char *sysbuf; \
572 size_t syslen; \
573 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"; \
574 syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
575 sysbuf = xmalloc(syslen); \
576 if (end_addr < r_offset) \
577 /* not uncommon when things are optimized out */ \
578 end_addr = r_offset + 0x100; \
579 snprintf(sysbuf, syslen, sysfmt, \
580 (unsigned long)offset_tmp, \
581 (unsigned long)end_addr, \
582 elf->filename, \
583 (unsigned long)r_offset); \
584 fflush(stdout); \
585 if (system(sysbuf)) /* don't care */; \
586 fflush(stdout); \
587 free(sysbuf); \
588 } \
589 } \
590 } }
591 SHOW_TEXTRELS(32)
592 SHOW_TEXTRELS(64)
593 }
594 if (!*found_textrels)
595 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
596
597 return NULL;
598}
599
600static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
601{
602 struct stat st;
603 switch (*item) {
604 case '/': break;
605 case '.':
606 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
607 break;
608 case ':':
609 case '\0':
610 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
611 break;
612 case '$':
613 if (fstat(elf->fd, &st) != -1)
614 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
615 warnf("Security problem with %s='%s' in %s with mode set of %o",
616 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
617 break;
618 default:
619 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
620 break;
621 }
622}
169static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len) 623static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
170{ 624{
171 /* TODO: if be_quiet, only output RPATH's which aren't in /etc/ld.so.conf */
172 unsigned long i; 625 unsigned long i;
173 char *rpath, *runpath; 626 char *rpath, *runpath, **r;
174 void *strtbl_void; 627 void *strtbl_void;
175 628
176 if (!show_rpath) return; 629 if (!show_rpath) return;
177 630
178 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 631 strtbl_void = elf_findsecbyname(elf, ".dynstr");
184 Elf ## B ## _Dyn *dyn; \ 637 Elf ## B ## _Dyn *dyn; \
185 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 638 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
186 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 639 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
187 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 640 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
188 Elf ## B ## _Off offset; \ 641 Elf ## B ## _Off offset; \
642 Elf ## B ## _Xword word; \
643 /* Scan all the program headers */ \
189 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 644 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
645 /* Just scan dynamic headers */ \
190 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 646 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
191 offset = EGET(phdr[i].p_offset); \ 647 offset = EGET(phdr[i].p_offset); \
192 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 648 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
649 /* Just scan dynamic RPATH/RUNPATH headers */ \
193 dyn = DYN ## B (elf->data + offset); \ 650 dyn = DYN ## B (elf->vdata + offset); \
194 while (EGET(dyn->d_tag) != DT_NULL) { \ 651 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
195 if (EGET(dyn->d_tag) == DT_RPATH) { \ 652 if (word == DT_RPATH) { \
196 if (rpath) warn("ELF has multiple DT_RPATH's !?"); \ 653 r = &rpath; \
654 } else if (word == DT_RUNPATH) { \
655 r = &runpath; \
656 } else { \
657 ++dyn; \
658 continue; \
659 } \
660 /* Verify the memory is somewhat sane */ \
197 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 661 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
198 if (offset >= elf->len) continue; \ 662 if (offset < (Elf ## B ## _Off)elf->len) { \
663 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
199 rpath = (char*)(elf->data + offset); \ 664 *r = elf->data + offset; \
665 /* cache the length in case we need to nuke this section later on */ \
666 if (fix_elf) \
667 offset = strlen(*r); \
668 /* If quiet, don't output paths in ld.so.conf */ \
669 if (be_quiet) { \
670 size_t len; \
671 char *start, *end; \
672 /* note that we only 'chop' off leading known paths. */ \
673 /* since *r is read-only memory, we can only move the ptr forward. */ \
674 start = *r; \
675 /* scan each path in : delimited list */ \
676 while (start) { \
677 rpath_security_checks(elf, start, get_elfdtype(word)); \
678 end = strchr(start, ':'); \
679 len = (end ? abs(end - start) : strlen(start)); \
680 if (use_ldcache) { \
681 size_t n; \
682 const char *ldpath; \
683 array_for_each(ldpaths, n, ldpath) \
684 if (!strncmp(ldpath, start, len) && !ldpath[len]) { \
685 *r = end; \
686 /* corner case ... if RPATH reads "/usr/lib:", we want \
687 * to show ':' rather than '' */ \
688 if (end && end[1] != '\0') \
689 (*r)++; \
690 break; \
691 } \
692 } \
693 if (!*r || !end) \
694 break; \
695 else \
696 start = start + len + 1; \
697 } \
698 } \
699 if (*r) { \
700 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
701 /* just nuke it */ \
702 nuke_it##B: \
703 memset(*r, 0x00, offset); \
704 *r = NULL; \
705 ESET(dyn->d_tag, DT_DEBUG); \
706 ESET(dyn->d_un.d_ptr, 0); \
707 } else if (fix_elf) { \
708 /* try to clean "bad" paths */ \
709 size_t len, tmpdir_len; \
710 char *start, *end; \
711 const char *tmpdir; \
712 start = *r; \
713 tmpdir = (getenv("TMPDIR") ? : "."); \
714 tmpdir_len = strlen(tmpdir); \
715 while (1) { \
716 end = strchr(start, ':'); \
717 if (start == end) { \
718 eat_this_path##B: \
719 len = strlen(end); \
720 memmove(start, end+1, len); \
721 start[len-1] = '\0'; \
722 end = start - 1; \
723 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
724 if (!end) { \
725 if (start == *r) \
726 goto nuke_it##B; \
727 *--start = '\0'; \
728 } else \
729 goto eat_this_path##B; \
730 } \
731 if (!end) \
732 break; \
733 start = end + 1; \
734 } \
735 if (**r == '\0') \
736 goto nuke_it##B; \
737 } \
738 if (*r) \
200 *found_rpath = 1; \ 739 *found_rpath = 1; \
201 } else if (EGET(dyn->d_tag) == DT_RUNPATH) { \ 740 } \
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 } \ 741 } \
208 ++dyn; \ 742 ++dyn; \
209 } \ 743 } \
210 } } 744 } }
211 SHOW_RPATH(32) 745 SHOW_RPATH(32)
212 SHOW_RPATH(64) 746 SHOW_RPATH(64)
213 } 747 }
748
749 if (be_wewy_wewy_quiet) return;
214 750
215 if (rpath && runpath) { 751 if (rpath && runpath) {
216 if (!strcmp(rpath, runpath)) { 752 if (!strcmp(rpath, runpath)) {
217 xstrcat(ret, runpath, ret_len); 753 xstrcat(ret, runpath, ret_len);
218 } else { 754 } else {
226 } else if (rpath || runpath) 762 } else if (rpath || runpath)
227 xstrcat(ret, (runpath ? runpath : rpath), ret_len); 763 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
228 else if (!be_quiet) 764 else if (!be_quiet)
229 xstrcat(ret, " - ", ret_len); 765 xstrcat(ret, " - ", ret_len);
230} 766}
767
768/* Defines can be seen in glibc's sysdeps/generic/ldconfig.h */
769#define LDSO_CACHE_MAGIC "ld.so-"
770#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
771#define LDSO_CACHE_VER "1.7.0"
772#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
773#define FLAG_ANY -1
774#define FLAG_TYPE_MASK 0x00ff
775#define FLAG_LIBC4 0x0000
776#define FLAG_ELF 0x0001
777#define FLAG_ELF_LIBC5 0x0002
778#define FLAG_ELF_LIBC6 0x0003
779#define FLAG_REQUIRED_MASK 0xff00
780#define FLAG_SPARC_LIB64 0x0100
781#define FLAG_IA64_LIB64 0x0200
782#define FLAG_X8664_LIB64 0x0300
783#define FLAG_S390_LIB64 0x0400
784#define FLAG_POWERPC_LIB64 0x0500
785#define FLAG_MIPS64_LIBN32 0x0600
786#define FLAG_MIPS64_LIBN64 0x0700
787#define FLAG_X8664_LIBX32 0x0800
788#define FLAG_ARM_LIBHF 0x0900
789#define FLAG_AARCH64_LIB64 0x0a00
790
791#if defined(__GLIBC__) || defined(__UCLIBC__)
792
793static char *lookup_cache_lib(elfobj *elf, const char *fname)
794{
795 int fd;
796 char *strs;
797 static char buf[__PAX_UTILS_PATH_MAX] = "";
798 const char *cachefile = root_rel_path("/etc/ld.so.cache");
799 struct stat st;
800
801 typedef struct {
802 char magic[LDSO_CACHE_MAGIC_LEN];
803 char version[LDSO_CACHE_VER_LEN];
804 int nlibs;
805 } header_t;
806 header_t *header;
807
808 typedef struct {
809 int flags;
810 int sooffset;
811 int liboffset;
812 } libentry_t;
813 libentry_t *libent;
814
815 if (fname == NULL)
816 return NULL;
817
818 if (ldcache == NULL) {
819 if (fstatat(root_fd, cachefile, &st, 0))
820 return NULL;
821
822 fd = openat(root_fd, cachefile, O_RDONLY);
823 if (fd == -1)
824 return NULL;
825
826 /* cache these values so we only map/unmap the cache file once */
827 ldcache_size = st.st_size;
828 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
829 close(fd);
830
831 if (ldcache == MAP_FAILED) {
832 ldcache = NULL;
833 return NULL;
834 }
835
836 if (memcmp(header->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN) ||
837 memcmp(header->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
838 {
839 munmap(ldcache, ldcache_size);
840 ldcache = NULL;
841 return NULL;
842 }
843 } else
844 header = ldcache;
845
846 libent = ldcache + sizeof(header_t);
847 strs = (char *) &libent[header->nlibs];
848
849 for (fd = 0; fd < header->nlibs; ++fd) {
850 /* This should be more fine grained, but for now we assume that
851 * diff arches will not be cached together, and we ignore the
852 * the different multilib mips cases.
853 */
854 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
855 continue;
856 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
857 continue;
858
859 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
860 continue;
861
862 /* Return first hit because that is how the ldso rolls */
863 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
864 break;
865 }
866
867 return buf;
868}
869
870#elif defined(__NetBSD__)
871static char *lookup_cache_lib(elfobj *elf, const char *fname)
872{
873 static char buf[__PAX_UTILS_PATH_MAX] = "";
874 static struct stat st;
875 size_t n;
876 char *ldpath;
877
878 array_for_each(ldpath, n, ldpath) {
879 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", ldpath, fname) >= sizeof(buf))
880 continue; /* if the pathname is too long, or something went wrong, ignore */
881
882 if (stat(buf, &st) != 0)
883 continue; /* if the lib doesn't exist in *ldpath, look further */
884
885 /* NetBSD doesn't actually do sanity checks, it just loads the file
886 * and if that doesn't work, continues looking in other directories.
887 * This cannot easily be safely emulated, unfortunately. For now,
888 * just assume that if it exists, it's a valid library. */
889
890 return buf;
891 }
892
893 /* not found in any path */
894 return NULL;
895}
896#else
897#ifdef __ELF__
898#warning Cache support not implemented for your target
899#endif
900static char *lookup_cache_lib(elfobj *elf, const char *fname)
901{
902 return NULL;
903}
904#endif
905
906static char *lookup_config_lib(elfobj *elf, char *fname)
907{
908 static char buf[__PAX_UTILS_PATH_MAX] = "";
909 const char *ldpath;
910 size_t n;
911
912 array_for_each(ldpaths, n, ldpath) {
913 snprintf(buf, sizeof(buf), "%s/%s", root_rel_path(ldpath), fname);
914 if (faccessat(root_fd, buf, F_OK, AT_SYMLINK_NOFOLLOW) == 0)
915 return buf;
916 }
917
918 return NULL;
919}
920
231static void scanelf_file_needed(elfobj *elf, char *found_needed, char **ret, size_t *ret_len) 921static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
232{ 922{
233 unsigned long i; 923 unsigned long i;
234 char *needed; 924 char *needed;
235 void *strtbl_void; 925 void *strtbl_void;
926 char *p;
236 927
237 if (!show_needed) return; 928 /*
929 * -n -> op==0 -> print all
930 * -N -> op==1 -> print requested
931 */
932 if ((op == 0 && !show_needed) || (op == 1 && !find_lib))
933 return NULL;
238 934
239 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 935 strtbl_void = elf_findsecbyname(elf, ".dynstr");
240 936
241 if (elf->phdr && strtbl_void) { 937 if (elf->phdr && strtbl_void) {
242#define SHOW_NEEDED(B) \ 938#define SHOW_NEEDED(B) \
244 Elf ## B ## _Dyn *dyn; \ 940 Elf ## B ## _Dyn *dyn; \
245 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 941 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
246 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 942 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
247 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 943 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
248 Elf ## B ## _Off offset; \ 944 Elf ## B ## _Off offset; \
945 size_t matched = 0; \
946 /* Walk all the program headers to find the PT_DYNAMIC */ \
249 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 947 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
250 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 948 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) \
949 continue; \
251 offset = EGET(phdr[i].p_offset); \ 950 offset = EGET(phdr[i].p_offset); \
252 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 951 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
952 continue; \
953 /* Walk all the dynamic tags to find NEEDED entries */ \
253 dyn = DYN ## B (elf->data + offset); \ 954 dyn = DYN ## B (elf->vdata + offset); \
254 while (EGET(dyn->d_tag) != DT_NULL) { \ 955 while (EGET(dyn->d_tag) != DT_NULL) { \
255 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 956 if (EGET(dyn->d_tag) == DT_NEEDED) { \
256 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 957 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
257 if (offset >= elf->len) continue; \ 958 if (offset >= (Elf ## B ## _Off)elf->len) { \
959 ++dyn; \
960 continue; \
961 } \
258 needed = (char*)(elf->data + offset); \ 962 needed = elf->data + offset; \
963 if (op == 0) { \
964 /* -n -> print all entries */ \
965 if (!be_wewy_wewy_quiet) { \
259 if (*found_needed) xchrcat(ret, ',', ret_len); \ 966 if (*found_needed) xchrcat(ret, ',', ret_len); \
967 if (use_ldpath) { \
968 if ((p = lookup_config_lib(elf, needed)) != NULL) \
969 needed = p; \
970 } else if (use_ldcache) { \
971 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
972 needed = p; \
973 } \
260 xstrcat(ret, needed, ret_len); \ 974 xstrcat(ret, needed, ret_len); \
975 } \
261 *found_needed = 1; \ 976 *found_needed = 1; \
977 } else { \
978 /* -N -> print matching entries */ \
979 size_t n; \
980 const char *find_lib_name; \
981 \
982 array_for_each(find_lib_arr, n, find_lib_name) { \
983 int invert = 1; \
984 if (find_lib_name[0] == '!') \
985 invert = 0, ++find_lib_name; \
986 if (!strcmp(find_lib_name, needed) == invert) \
987 ++matched; \
988 } \
989 \
990 if (matched == array_cnt(find_lib_arr)) { \
991 *found_lib = 1; \
992 return (be_wewy_wewy_quiet ? NULL : find_lib); \
993 } \
994 } \
262 } \ 995 } \
263 ++dyn; \ 996 ++dyn; \
264 } \ 997 } \
265 } } 998 } }
266 SHOW_NEEDED(32) 999 SHOW_NEEDED(32)
267 SHOW_NEEDED(64) 1000 SHOW_NEEDED(64)
1001 if (op == 0 && !*found_needed && be_verbose)
1002 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
268 } 1003 }
1004
1005 return NULL;
269} 1006}
270static char *scanelf_file_interp(elfobj *elf, char *found_interp) 1007static char *scanelf_file_interp(elfobj *elf, char *found_interp)
271{ 1008{
272 void *strtbl_void; 1009 void *strtbl_void;
273 1010
278 if (strtbl_void) { 1015 if (strtbl_void) {
279#define SHOW_INTERP(B) \ 1016#define SHOW_INTERP(B) \
280 if (elf->elf_class == ELFCLASS ## B) { \ 1017 if (elf->elf_class == ELFCLASS ## B) { \
281 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 1018 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
282 *found_interp = 1; \ 1019 *found_interp = 1; \
283 return elf->data + EGET(strtbl->sh_offset); \ 1020 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
284 } 1021 }
285 SHOW_INTERP(32) 1022 SHOW_INTERP(32)
286 SHOW_INTERP(64) 1023 SHOW_INTERP(64)
1024 } else {
1025 /* Walk all the program headers to find the PT_INTERP */
1026#define SHOW_PT_INTERP(B) \
1027 if (elf->elf_class == ELFCLASS ## B) { \
1028 unsigned long i; \
1029 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1030 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1031 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1032 if (EGET(phdr[i].p_type) != PT_INTERP) \
1033 continue; \
1034 *found_interp = 1; \
1035 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(phdr[i].p_offset)); \
1036 } \
287 } 1037 }
1038 SHOW_PT_INTERP(32)
1039 SHOW_PT_INTERP(64)
1040 }
1041
288 return NULL; 1042 return NULL;
289} 1043}
290static char *scanelf_file_sym(elfobj *elf, char *found_sym, const char *filename) 1044static char *scanelf_file_bind(elfobj *elf, char *found_bind)
291{ 1045{
292 unsigned long i; 1046 unsigned long i;
1047 struct stat s;
1048 char dynamic = 0;
1049
1050 if (!show_bind) return NULL;
1051 if (!elf->phdr) return NULL;
1052
1053#define SHOW_BIND(B) \
1054 if (elf->elf_class == ELFCLASS ## B) { \
1055 Elf ## B ## _Dyn *dyn; \
1056 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1057 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1058 Elf ## B ## _Off offset; \
1059 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1060 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1061 dynamic = 1; \
1062 offset = EGET(phdr[i].p_offset); \
1063 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
1064 dyn = DYN ## B (elf->vdata + offset); \
1065 while (EGET(dyn->d_tag) != DT_NULL) { \
1066 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
1067 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
1068 { \
1069 if (be_quiet) return NULL; \
1070 *found_bind = 1; \
1071 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
1072 } \
1073 ++dyn; \
1074 } \
1075 } \
1076 }
1077 SHOW_BIND(32)
1078 SHOW_BIND(64)
1079
1080 if (be_wewy_wewy_quiet) return NULL;
1081
1082 /* don't output anything if quiet mode and the ELF is static or not setuid */
1083 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
1084 return NULL;
1085 } else {
1086 *found_bind = 1;
1087 return (char *)(dynamic ? "LAZY" : "STATIC");
1088 }
1089}
1090static char *scanelf_file_soname(elfobj *elf, char *found_soname)
1091{
1092 unsigned long i;
1093 char *soname;
1094 void *strtbl_void;
1095
1096 if (!show_soname) return NULL;
1097
1098 strtbl_void = elf_findsecbyname(elf, ".dynstr");
1099
1100 if (elf->phdr && strtbl_void) {
1101#define SHOW_SONAME(B) \
1102 if (elf->elf_class == ELFCLASS ## B) { \
1103 Elf ## B ## _Dyn *dyn; \
1104 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1105 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1106 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
1107 Elf ## B ## _Off offset; \
1108 /* only look for soname in shared objects */ \
1109 if (EGET(ehdr->e_type) != ET_DYN) \
1110 return NULL; \
1111 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1112 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1113 offset = EGET(phdr[i].p_offset); \
1114 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
1115 dyn = DYN ## B (elf->vdata + offset); \
1116 while (EGET(dyn->d_tag) != DT_NULL) { \
1117 if (EGET(dyn->d_tag) == DT_SONAME) { \
1118 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
1119 if (offset >= (Elf ## B ## _Off)elf->len) { \
1120 ++dyn; \
1121 continue; \
1122 } \
1123 soname = elf->data + offset; \
1124 *found_soname = 1; \
1125 return (be_wewy_wewy_quiet ? NULL : soname); \
1126 } \
1127 ++dyn; \
1128 } \
1129 } }
1130 SHOW_SONAME(32)
1131 SHOW_SONAME(64)
1132 }
1133
1134 return NULL;
1135}
1136
1137/*
1138 * We support the symbol form:
1139 * [%[modifiers]%][[+-]<symbol name>][,[.....]]
1140 * If the symbol name is empty, then all symbols are matched.
1141 * If the symbol name is a glob ("*"), then all symbols are dumped (debug).
1142 * Do not rely on this output format at all.
1143 * Otherwise the symbol name is used to search (either regex or string compare).
1144 * If the first char of the symbol name is a plus ("+"), then only match
1145 * defined symbols. If it's a minus ("-"), only match undefined symbols.
1146 * Putting modifiers in between the percent signs allows for more in depth
1147 * filters. There are groups of modifiers. If you don't specify a member
1148 * of a group, then all types in that group are matched. The current
1149 * groups and their types are:
1150 * STT group: STT_NOTYPE:n STT_OBJECT:o STT_FUNC:f STT_FILE:F
1151 * STB group: STB_LOCAL:l STB_GLOBAL:g STB_WEAK:w
1152 * SHN group: SHN_UNDEF:u SHN_ABS:a SHN_COMMON:c {defined}:d
1153 * The "defined" value in the SHN group does not correspond to a SHN_xxx define.
1154 * You can search for multiple symbols at once by seperating with a comma (",").
1155 *
1156 * Some examples:
1157 * ELFs with a weak function "foo":
1158 * scanelf -s %wf%foo <ELFs>
1159 * ELFs that define the symbol "main":
1160 * scanelf -s +main <ELFs>
1161 * scanelf -s %d%main <ELFs>
1162 * ELFs that refer to the undefined symbol "brk":
1163 * scanelf -s -brk <ELFs>
1164 * scanelf -s %u%brk <ELFs>
1165 * All global defined objects in an ELF:
1166 * scanelf -s %ogd% <ELF>
1167 */
1168static void
1169scanelf_match_symname(elfobj *elf, char *found_sym, char **ret, size_t *ret_len, const char *symname,
1170 unsigned int stt, unsigned int stb, unsigned int shn, unsigned long size)
1171{
1172 const char *this_sym;
1173 size_t n;
1174
1175 array_for_each(find_sym_arr, n, this_sym) {
1176 bool inc_notype, inc_object, inc_func, inc_file,
1177 inc_local, inc_global, inc_weak,
1178 inc_def, inc_undef, inc_abs, inc_common;
1179
1180 /* symbol selection! */
1181 inc_notype = inc_object = inc_func = inc_file = \
1182 inc_local = inc_global = inc_weak = \
1183 inc_def = inc_undef = inc_abs = inc_common = \
1184 (*this_sym != '%');
1185
1186 /* parse the contents of %...% */
1187 if (!inc_notype) {
1188 while (*(this_sym++)) {
1189 if (*this_sym == '%') {
1190 ++this_sym;
1191 break;
1192 }
1193 switch (*this_sym) {
1194 case 'n': inc_notype = true; break;
1195 case 'o': inc_object = true; break;
1196 case 'f': inc_func = true; break;
1197 case 'F': inc_file = true; break;
1198 case 'l': inc_local = true; break;
1199 case 'g': inc_global = true; break;
1200 case 'w': inc_weak = true; break;
1201 case 'd': inc_def = true; break;
1202 case 'u': inc_undef = true; break;
1203 case 'a': inc_abs = true; break;
1204 case 'c': inc_common = true; break;
1205 default: err("invalid symbol selector '%c'", *this_sym);
1206 }
1207 }
1208
1209 /* If no types are matched, not match all */
1210 if (!inc_notype && !inc_object && !inc_func && !inc_file)
1211 inc_notype = inc_object = inc_func = inc_file = true;
1212 if (!inc_local && !inc_global && !inc_weak)
1213 inc_local = inc_global = inc_weak = true;
1214 if (!inc_def && !inc_undef && !inc_abs && !inc_common)
1215 inc_def = inc_undef = inc_abs = inc_common = true;
1216
1217 /* backwards compat for defined/undefined short hand */
1218 } else if (*this_sym == '+') {
1219 inc_undef = false;
1220 ++this_sym;
1221 } else if (*this_sym == '-') {
1222 inc_def = inc_abs = inc_common = false;
1223 ++this_sym;
1224 }
1225
1226 /* filter symbols */
1227 if ((!inc_notype && stt == STT_NOTYPE) || \
1228 (!inc_object && stt == STT_OBJECT) || \
1229 (!inc_func && stt == STT_FUNC ) || \
1230 (!inc_file && stt == STT_FILE ) || \
1231 (!inc_local && stb == STB_LOCAL ) || \
1232 (!inc_global && stb == STB_GLOBAL) || \
1233 (!inc_weak && stb == STB_WEAK ) || \
1234 (!inc_def && shn && shn < SHN_LORESERVE) || \
1235 (!inc_undef && shn == SHN_UNDEF ) || \
1236 (!inc_abs && shn == SHN_ABS ) || \
1237 (!inc_common && shn == SHN_COMMON))
1238 continue;
1239
1240 if (*this_sym == '*') {
1241 /* a "*" symbol gets you debug output */
1242 printf("%s(%s) %5lX %15s %15s %15s %s\n",
1243 ((*found_sym == 0) ? "\n\t" : "\t"),
1244 elf->base_filename,
1245 size,
1246 get_elfstttype(stt),
1247 get_elfstbtype(stb),
1248 get_elfshntype(shn),
1249 symname);
1250 goto matched;
1251
1252 } else {
1253 if (g_match) {
1254 /* regex match the symbol */
1255 if (regexec(find_sym_regex_arr->eles[n], symname, 0, NULL, 0) == REG_NOMATCH)
1256 continue;
1257
1258 } else if (*this_sym) {
1259 /* give empty symbols a "pass", else do a normal compare */
1260 const size_t len = strlen(this_sym);
1261 if (!(strncmp(this_sym, symname, len) == 0 &&
1262 /* Accept unversioned symbol names */
1263 (symname[len] == '\0' || symname[len] == '@')))
1264 continue;
1265 }
1266
1267 if (be_semi_verbose) {
1268 char buf[1024];
1269 snprintf(buf, sizeof(buf), "%lX %s %s",
1270 size,
1271 get_elfstttype(stt),
1272 this_sym);
1273 *ret = xstrdup(buf);
1274 } else {
1275 if (*ret) xchrcat(ret, ',', ret_len);
1276 xstrcat(ret, symname, ret_len);
1277 }
1278
1279 goto matched;
1280 }
1281 }
1282
1283 return;
1284
1285 matched:
1286 *found_sym = 1;
1287}
1288
1289static const char *scanelf_file_sym(elfobj *elf, char *found_sym)
1290{
1291 char *ret;
293 void *symtab_void, *strtab_void; 1292 void *symtab_void, *strtab_void;
294 1293
295 if (!find_sym) return NULL; 1294 if (!find_sym) return NULL;
1295 ret = NULL;
296 1296
297 symtab_void = elf_findsecbyname(elf, ".symtab"); 1297 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
298 strtab_void = elf_findsecbyname(elf, ".strtab");
299 1298
300 if (symtab_void && strtab_void) { 1299 if (symtab_void && strtab_void) {
301#define FIND_SYM(B) \ 1300#define FIND_SYM(B) \
302 if (elf->elf_class == ELFCLASS ## B) { \ 1301 if (elf->elf_class == ELFCLASS ## B) { \
303 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 1302 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
304 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 1303 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
305 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 1304 Elf ## B ## _Sym *sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
306 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 1305 Elf ## B ## _Word i, cnt = EGET(symtab->sh_entsize); \
307 char *symname; \ 1306 char *symname; \
1307 size_t ret_len = 0; \
1308 if (cnt) \
1309 cnt = EGET(symtab->sh_size) / cnt; \
308 for (i = 0; i < cnt; ++i) { \ 1310 for (i = 0; i < cnt; ++i) { \
1311 if ((void*)sym > elf->data_end) { \
1312 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1313 goto break_out; \
1314 } \
309 if (sym->st_name) { \ 1315 if (sym->st_name) { \
1316 /* make sure the symbol name is in acceptable memory range */ \
310 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 1317 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
311 if (*find_sym == '*') { \ 1318 if ((void*)symname > elf->data_end) { \
312 printf("%s(%s) %5lX %15s %s\n", \ 1319 warnf("%s: corrupt ELF symbols", elf->filename); \
313 ((*found_sym == 0) ? "\n\t" : "\t"), \ 1320 ++sym; \
314 (char *)basename(filename), \ 1321 continue; \
315 (long)sym->st_size, \ 1322 } \
316 (char *)get_elfstttype(sym->st_info), \ 1323 scanelf_match_symname(elf, found_sym, \
317 symname); \ 1324 &ret, &ret_len, symname, \
318 *found_sym = 1; \ 1325 ELF##B##_ST_TYPE(EGET(sym->st_info)), \
319 } else if ((strcmp(find_sym, symname) == 0) || \ 1326 ELF##B##_ST_BIND(EGET(sym->st_info)), \
320 (strcmp(symname, versioned_symname) == 0)) \ 1327 EGET(sym->st_shndx), \
321 (*found_sym)++; \ 1328 /* st_size can be 64bit, but no one is really that big, so screw em */ \
1329 EGET(sym->st_size)); \
322 } \ 1330 } \
323 ++sym; \ 1331 ++sym; \
324 } } 1332 } \
1333 }
325 FIND_SYM(32) 1334 FIND_SYM(32)
326 FIND_SYM(64) 1335 FIND_SYM(64)
327 } 1336 }
1337
1338break_out:
1339 if (be_wewy_wewy_quiet) return NULL;
1340
328 if (*find_sym != '*' && *found_sym) 1341 if (*find_sym != '*' && *found_sym)
329 return find_sym; 1342 return ret;
330 if (be_quiet) 1343 if (be_quiet)
331 return NULL; 1344 return NULL;
332 else 1345 else
333 return " - "; 1346 return " - ";
334} 1347}
1348
1349static const char *scanelf_file_sections(elfobj *elf, char *found_section)
1350{
1351 if (!find_section)
1352 return NULL;
1353
1354#define FIND_SECTION(B) \
1355 if (elf->elf_class == ELFCLASS ## B) { \
1356 size_t matched, n; \
1357 int invert; \
1358 const char *section_name; \
1359 Elf ## B ## _Shdr *section; \
1360 \
1361 matched = 0; \
1362 array_for_each(find_section_arr, n, section_name) { \
1363 invert = (*section_name == '!' ? 1 : 0); \
1364 section = SHDR ## B (elf_findsecbyname(elf, section_name + invert)); \
1365 if ((section == NULL && invert) || (section != NULL && !invert)) \
1366 ++matched; \
1367 } \
1368 \
1369 if (matched == array_cnt(find_section_arr)) \
1370 *found_section = 1; \
1371 }
1372 FIND_SECTION(32)
1373 FIND_SECTION(64)
1374
1375 if (be_wewy_wewy_quiet)
1376 return NULL;
1377
1378 if (*found_section)
1379 return find_section;
1380
1381 if (be_quiet)
1382 return NULL;
1383 else
1384 return " - ";
1385}
1386
335/* scan an elf file and show all the fun stuff */ 1387/* scan an elf file and show all the fun stuff */
336#define prints(str) fputs(str, stdout) 1388#define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
337static void scanelf_file(const char *filename) 1389static int scanelf_elfobj(elfobj *elf)
338{ 1390{
339 unsigned long i; 1391 unsigned long i;
340 char found_pax, found_stack, found_relro, found_textrel, 1392 char found_pax, found_phdr, found_relro, found_load, found_textrel,
341 found_rpath, found_needed, found_interp, found_sym, 1393 found_rpath, found_needed, found_interp, found_bind, found_soname,
342 found_file; 1394 found_sym, found_lib, found_file, found_textrels, found_section;
343 elfobj *elf;
344 struct stat st;
345 static char *out_buffer = NULL; 1395 static char *out_buffer = NULL;
346 static size_t out_len; 1396 static size_t out_len;
347 1397
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 = \ 1398 found_pax = found_phdr = found_relro = found_load = found_textrel = \
360 found_rpath = found_needed = found_interp = found_sym = \ 1399 found_rpath = found_needed = found_interp = found_bind = found_soname = \
361 found_file = 0; 1400 found_sym = found_lib = found_file = found_textrels = found_section = 0;
362 1401
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) 1402 if (be_verbose > 2)
370 printf("%s: scanning file {%s,%s}\n", filename, 1403 printf("%s: scanning file {%s,%s}\n", elf->filename,
371 get_elfeitype(elf, EI_CLASS, elf->elf_class), 1404 get_elfeitype(EI_CLASS, elf->elf_class),
372 get_elfeitype(elf, EI_DATA, elf->data[EI_DATA])); 1405 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
373 else if (be_verbose) 1406 else if (be_verbose > 1)
374 printf("%s: scanning file\n", filename); 1407 printf("%s: scanning file\n", elf->filename);
375 1408
376 /* init output buffer */ 1409 /* init output buffer */
377 if (!out_buffer) { 1410 if (!out_buffer) {
378 out_len = sizeof(char) * 80; 1411 out_len = sizeof(char) * 80;
379 out_buffer = (char*)xmalloc(out_len); 1412 out_buffer = xmalloc(out_len);
380 } 1413 }
381 *out_buffer = '\0'; 1414 *out_buffer = '\0';
382 1415
383 /* show the header */ 1416 /* show the header */
384 if (!be_quiet && show_banner) { 1417 if (!be_quiet && show_banner) {
385 for (i=0; out_format[i]; ++i) { 1418 for (i = 0; out_format[i]; ++i) {
386 if (out_format[i] != '%') continue; 1419 if (!IS_MODIFIER(out_format[i])) continue;
387 1420
388 switch (out_format[++i]) { 1421 switch (out_format[++i]) {
1422 case '+': break;
389 case '%': break; 1423 case '%': break;
1424 case '#': break;
1425 case 'F':
1426 case 'p':
390 case 'F': prints("FILE "); break; 1427 case 'f': prints("FILE "); found_file = 1; break;
391 case 'o': prints(" TYPE "); break; 1428 case 'o': prints(" TYPE "); break;
392 case 'x': prints(" PAX "); break; 1429 case 'x': prints(" PAX "); break;
393 case 'e': prints("STK/REL "); break; 1430 case 'e': prints("STK/REL/PTL "); break;
394 case 't': prints("TEXTREL "); break; 1431 case 't': prints("TEXTREL "); break;
395 case 'r': prints("RPATH "); break; 1432 case 'r': prints("RPATH "); break;
1433 case 'M': prints("CLASS "); break;
1434 case 'l':
396 case 'n': prints("NEEDED "); break; 1435 case 'n': prints("NEEDED "); break;
397 case 'i': prints("INTERP "); break; 1436 case 'i': prints("INTERP "); break;
1437 case 'b': prints("BIND "); break;
1438 case 'Z': prints("SIZE "); break;
1439 case 'S': prints("SONAME "); break;
398 case 's': prints("SYM "); break; 1440 case 's': prints("SYM "); break;
1441 case 'N': prints("LIB "); break;
1442 case 'T': prints("TEXTRELS "); break;
1443 case 'k': prints("SECTION "); break;
1444 case 'a': prints("ARCH "); break;
1445 case 'I': prints("OSABI "); break;
1446 case 'Y': prints("EABI "); break;
1447 case 'O': prints("PERM "); break;
1448 case 'D': prints("ENDIAN "); break;
1449 default: warnf("'%c' has no title ?", out_format[i]);
399 } 1450 }
400 } 1451 }
1452 if (!found_file) prints("FILE ");
401 prints("\n"); 1453 prints("\n");
1454 found_file = 0;
402 show_banner = 0; 1455 show_banner = 0;
403 } 1456 }
404 1457
405 /* dump all the good stuff */ 1458 /* dump all the good stuff */
406 for (i=0; out_format[i]; ++i) { 1459 for (i = 0; out_format[i]; ++i) {
407 const char *out; 1460 const char *out;
408 1461 const char *tmp;
409 /* make sure we trim leading spaces in quiet mode */ 1462 static char ubuf[sizeof(unsigned long)*2];
410 if (be_quiet && *out_buffer == ' ' && !out_buffer[1]) 1463 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); 1464 xchrcat(&out_buffer, out_format[i], &out_len);
415 continue; 1465 continue;
416 } 1466 }
417 1467
418 out = NULL; 1468 out = NULL;
1469 be_wewy_wewy_quiet = (out_format[i] == '#');
1470 be_semi_verbose = (out_format[i] == '+');
419 switch (out_format[++i]) { 1471 switch (out_format[++i]) {
1472 case '+':
1473 case '%':
1474 case '#':
420 case '%': xchrcat(&out_buffer, '%', &out_len); break; 1475 xchrcat(&out_buffer, out_format[i], &out_len); break;
421 case 'F': found_file = 1; xstrcat(&out_buffer, filename, &out_len); break; 1476 case 'F':
1477 found_file = 1;
1478 if (be_wewy_wewy_quiet) break;
1479 xstrcat(&out_buffer, elf->filename, &out_len);
1480 break;
1481 case 'p':
1482 found_file = 1;
1483 if (be_wewy_wewy_quiet) break;
1484 tmp = elf->filename;
1485 if (search_path) {
1486 ssize_t len_search = strlen(search_path);
1487 ssize_t len_file = strlen(elf->filename);
1488 if (!strncmp(elf->filename, search_path, len_search) && \
1489 len_file > len_search)
1490 tmp += len_search;
1491 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1492 }
1493 xstrcat(&out_buffer, tmp, &out_len);
1494 break;
1495 case 'f':
1496 found_file = 1;
1497 if (be_wewy_wewy_quiet) break;
1498 tmp = strrchr(elf->filename, '/');
1499 tmp = (tmp == NULL ? elf->filename : tmp+1);
1500 xstrcat(&out_buffer, tmp, &out_len);
1501 break;
422 case 'o': out = get_elfetype(elf); break; 1502 case 'o': out = get_elfetype(elf); break;
423 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1503 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
424 case 'e': out = scanelf_file_stack(elf, &found_stack, &found_relro); break; 1504 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; 1505 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1506 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; 1507 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1508 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1509 case 'D': out = get_endian(elf); break;
1510 case 'O': out = strfileperms(elf->filename); break;
1511 case 'n':
427 case 'n': scanelf_file_needed(elf, &found_needed, &out_buffer, &out_len); break; 1512 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; 1513 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1514 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1515 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
429 case 's': out = scanelf_file_sym(elf, &found_sym, filename); break; 1516 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1517 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1518 case 'a': out = get_elfemtype(elf); break;
1519 case 'I': out = get_elfosabi(elf); break;
1520 case 'Y': out = get_elf_eabi(elf); break;
1521 case 'Z': snprintf(ubuf, sizeof(ubuf), "%lu", (unsigned long)elf->len); out = ubuf; break;;
1522 default: warnf("'%c' has no scan code?", out_format[i]);
430 } 1523 }
1524 if (out)
431 if (out) xstrcat(&out_buffer, out, &out_len); 1525 xstrcat(&out_buffer, out, &out_len);
432 } 1526 }
433 1527
434 if (!found_file) { 1528#define FOUND_SOMETHING() \
435 if (!be_quiet || found_pax || found_stack || found_textrel || \ 1529 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
436 found_rpath || found_needed || found_interp || found_sym) 1530 found_rpath || found_needed || found_interp || found_bind || \
1531 found_soname || found_sym || found_lib || found_textrels || found_section )
1532
1533 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1534 xchrcat(&out_buffer, ' ', &out_len);
437 xstrcat(&out_buffer, filename, &out_len); 1535 xstrcat(&out_buffer, elf->filename, &out_len);
438 } 1536 }
439 if (!(be_quiet && xemptybuffer(out_buffer))) 1537 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
440 puts(out_buffer); 1538 puts(out_buffer);
1539 fflush(stdout);
1540 }
441 1541
1542 return 0;
1543}
1544
1545/* scan a single elf */
1546static int scanelf_elf(const char *filename, int fd, size_t len)
1547{
1548 int ret = 1;
1549 elfobj *elf;
1550
1551 /* verify this is real ELF */
1552 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1553 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1554 return 2;
1555 }
1556 switch (match_bits) {
1557 case 32:
1558 if (elf->elf_class != ELFCLASS32)
1559 goto label_done;
1560 break;
1561 case 64:
1562 if (elf->elf_class != ELFCLASS64)
1563 goto label_done;
1564 break;
1565 default: break;
1566 }
1567 if (match_etypes) {
1568 char sbuf[126];
1569 strncpy(sbuf, match_etypes, sizeof(sbuf));
1570 if (strchr(match_etypes, ',') != NULL) {
1571 char *p;
1572 while ((p = strrchr(sbuf, ',')) != NULL) {
1573 *p = 0;
1574 if (etype_lookup(p+1) == get_etype(elf))
1575 goto label_ret;
1576 }
1577 }
1578 if (etype_lookup(sbuf) != get_etype(elf))
1579 goto label_done;
1580 }
1581
1582label_ret:
1583 ret = scanelf_elfobj(elf);
1584
1585label_done:
442 unreadelf(elf); 1586 unreadelf(elf);
1587 return ret;
1588}
1589
1590/* scan an archive of elfs */
1591static int scanelf_archive(const char *filename, int fd, size_t len)
1592{
1593 archive_handle *ar;
1594 archive_member *m;
1595 char *ar_buffer;
1596 elfobj *elf;
1597
1598 ar = ar_open_fd(filename, fd);
1599 if (ar == NULL)
1600 return 1;
1601
1602 ar_buffer = mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1603 while ((m = ar_next(ar)) != NULL) {
1604 off_t cur_pos = lseek(fd, 0, SEEK_CUR);
1605 if (cur_pos == -1)
1606 errp("lseek() failed");
1607 elf = readelf_buffer(m->name, ar_buffer + cur_pos, m->size);
1608 if (elf) {
1609 scanelf_elfobj(elf);
1610 unreadelf(elf);
1611 }
1612 }
1613 munmap(ar_buffer, len);
1614
1615 return 0;
1616}
1617/* scan a file which may be an elf or an archive or some other magical beast */
1618static int scanelf_fileat(int dir_fd, const char *filename, const struct stat *st_cache)
1619{
1620 const struct stat *st = st_cache;
1621 struct stat symlink_st;
1622 int fd;
1623
1624 /* always handle regular files and handle symlinked files if no -y */
1625 if (S_ISLNK(st->st_mode)) {
1626 if (!scan_symlink)
1627 return 1;
1628 fstatat(dir_fd, filename, &symlink_st, 0);
1629 st = &symlink_st;
1630 }
1631
1632 if (!S_ISREG(st->st_mode)) {
1633 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1634 return 1;
1635 }
1636
1637 if (match_perms) {
1638 if ((st->st_mode | match_perms) != st->st_mode)
1639 return 1;
1640 }
1641 fd = openat(dir_fd, filename, (fix_elf ? O_RDWR : O_RDONLY) | O_CLOEXEC);
1642 if (fd == -1) {
1643 if (fix_elf && errno == ETXTBSY)
1644 warnp("%s: could not fix", filename);
1645 else if (be_verbose > 2)
1646 printf("%s: skipping file: %s\n", filename, strerror(errno));
1647 return 1;
1648 }
1649
1650 if (scanelf_elf(filename, fd, st->st_size) == 2) {
1651 /* if it isn't an ELF, maybe it's an .a archive */
1652 if (scan_archives)
1653 scanelf_archive(filename, fd, st->st_size);
1654
1655 /*
1656 * unreadelf() implicitly closes its fd, so only close it
1657 * when we are returning it in the non-ELF case
1658 */
1659 close(fd);
1660 }
1661
1662 return 0;
443} 1663}
444 1664
445/* scan a directory for ET_EXEC files and print when we find one */ 1665/* scan a directory for ET_EXEC files and print when we find one */
446static void scanelf_dir(const char *path) 1666static int scanelf_dirat(int dir_fd, const char *path)
447{ 1667{
448 register DIR *dir; 1668 register DIR *dir;
449 register struct dirent *dentry; 1669 register struct dirent *dentry;
450 struct stat st_top, st; 1670 struct stat st_top, st;
451 char buf[_POSIX_PATH_MAX]; 1671 char buf[__PAX_UTILS_PATH_MAX], *subpath;
452 size_t pathlen = 0, len = 0; 1672 size_t pathlen = 0, len = 0;
1673 int ret = 0;
1674 int subdir_fd;
453 1675
454 /* make sure path exists */ 1676 /* make sure path exists */
455 if (lstat(path, &st_top) == -1) { 1677 if (fstatat(dir_fd, path, &st_top, AT_SYMLINK_NOFOLLOW) == -1) {
456 if (be_verbose > 2) printf("%s: does not exist\n", path); 1678 if (be_verbose > 2) printf("%s: does not exist\n", path);
457 return; 1679 return 1;
458 } 1680 }
459 1681
460 /* ok, if it isn't a directory, assume we can open it */ 1682 /* ok, if it isn't a directory, assume we can open it */
461 if (!S_ISDIR(st_top.st_mode)) { 1683 if (!S_ISDIR(st_top.st_mode))
462 scanelf_file(path); 1684 return scanelf_fileat(dir_fd, path, &st_top);
463 return;
464 }
465 1685
466 /* now scan the dir looking for fun stuff */ 1686 /* now scan the dir looking for fun stuff */
467 if ((dir = opendir(path)) == NULL) { 1687 subdir_fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
468 warnf("could not opendir %s: %s", path, strerror(errno)); 1688 if (subdir_fd == -1)
1689 dir = NULL;
1690 else
1691 dir = fdopendir(subdir_fd);
1692 if (dir == NULL) {
1693 if (subdir_fd != -1)
1694 close(subdir_fd);
1695 else if (be_verbose > 2)
1696 printf("%s: skipping dir: %s\n", path, strerror(errno));
469 return; 1697 return 1;
470 } 1698 }
471 if (be_verbose) printf("%s: scanning dir\n", path); 1699 if (be_verbose > 1) printf("%s: scanning dir\n", path);
472 1700
473 pathlen = strlen(path); 1701 subpath = stpcpy(buf, path);
1702 if (subpath[-1] != '/')
1703 *subpath++ = '/';
1704 pathlen = subpath - buf;
474 while ((dentry = readdir(dir))) { 1705 while ((dentry = readdir(dir))) {
475 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1706 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
476 continue; 1707 continue;
477 len = (pathlen + 1 + strlen(dentry->d_name) + 1); 1708
478 if (len >= sizeof(buf)) { 1709 if (fstatat(subdir_fd, dentry->d_name, &st, AT_SYMLINK_NOFOLLOW) == -1)
479 warnf("Skipping '%s': len > sizeof(buf); %d > %d\n", path, (int)len, (int)sizeof(buf));
480 continue; 1710 continue;
1711
1712 len = strlen(dentry->d_name);
1713 if (len + pathlen + 1 >= sizeof(buf)) {
1714 warnf("Skipping '%s%s': len > sizeof(buf); %zu > %zu\n",
1715 path, dentry->d_name, len + pathlen + 1, sizeof(buf));
1716 continue;
481 } 1717 }
482 sprintf(buf, "%s/%s", path, dentry->d_name); 1718 memcpy(subpath, dentry->d_name, len);
483 if (lstat(buf, &st) != -1) { 1719 subpath[len] = '\0';
1720
484 if (S_ISREG(st.st_mode)) 1721 if (S_ISREG(st.st_mode))
485 scanelf_file(buf); 1722 ret = scanelf_fileat(dir_fd, buf, &st);
486 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1723 else if (dir_recurse && S_ISDIR(st.st_mode)) {
487 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1724 if (dir_crossmount || (st_top.st_dev == st.st_dev))
488 scanelf_dir(buf); 1725 ret = scanelf_dirat(dir_fd, buf);
1726 }
1727 }
1728 closedir(dir);
1729
1730 return ret;
1731}
1732static int scanelf_dir(const char *path)
1733{
1734 return scanelf_dirat(root_fd, root_rel_path(path));
1735}
1736
1737static int scanelf_from_file(const char *filename)
1738{
1739 FILE *fp;
1740 char *p, *path;
1741 size_t len;
1742 int ret;
1743
1744 if (strcmp(filename, "-") == 0)
1745 fp = stdin;
1746 else if ((fp = fopen(filename, "r")) == NULL)
1747 return 1;
1748
1749 path = NULL;
1750 len = 0;
1751 ret = 0;
1752 while (getline(&path, &len, fp) != -1) {
1753 if ((p = strchr(path, '\n')) != NULL)
1754 *p = 0;
1755 search_path = path;
1756 ret = scanelf_dir(path);
1757 }
1758 free(path);
1759
1760 if (fp != stdin)
1761 fclose(fp);
1762
1763 return ret;
1764}
1765
1766#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1767
1768static int _load_ld_cache_config(const char *fname)
1769{
1770 FILE *fp = NULL;
1771 char *p, *path;
1772 size_t len;
1773 int curr_fd = -1;
1774
1775 fp = fopenat_r(root_fd, root_rel_path(fname));
1776 if (fp == NULL)
1777 return -1;
1778
1779 path = NULL;
1780 len = 0;
1781 while (getline(&path, &len, fp) != -1) {
1782 if ((p = strrchr(path, '\r')) != NULL)
1783 *p = 0;
1784 if ((p = strchr(path, '\n')) != NULL)
1785 *p = 0;
1786
1787 /* recursive includes of the same file will make this segfault. */
1788 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1789 glob_t gl;
1790 size_t x;
1791 const char *gpath;
1792
1793 /* re-use existing path buffer ... need to be creative */
1794 if (path[8] != '/')
1795 gpath = memcpy(path + 3, "/etc/", 5);
1796 else
1797 gpath = path + 8;
1798 if (root_fd != AT_FDCWD) {
1799 if (curr_fd == -1) {
1800 curr_fd = open(".", O_RDONLY|O_CLOEXEC);
1801 if (fchdir(root_fd))
1802 errp("unable to change to root dir");
1803 }
1804 gpath = root_rel_path(gpath);
489 } 1805 }
1806
1807 if (glob(gpath, 0, NULL, &gl) == 0) {
1808 for (x = 0; x < gl.gl_pathc; ++x) {
1809 /* try to avoid direct loops */
1810 if (strcmp(gl.gl_pathv[x], fname) == 0)
1811 continue;
1812 _load_ld_cache_config(gl.gl_pathv[x]);
1813 }
1814 globfree(&gl);
490 } 1815 }
1816
1817 /* failed globs are ignored by glibc */
1818 continue;
491 } 1819 }
492 closedir(dir); 1820
1821 if (*path != '/')
1822 continue;
1823
1824 xarraypush_str(ldpaths, path);
1825 }
1826 free(path);
1827
1828 fclose(fp);
1829
1830 if (curr_fd != -1) {
1831 if (fchdir(curr_fd))
1832 /* don't care */;
1833 close(curr_fd);
1834 }
1835
1836 return 0;
1837}
1838
1839#elif defined(__FreeBSD__) || defined(__DragonFly__)
1840
1841static int _load_ld_cache_config(const char *fname)
1842{
1843 FILE *fp = NULL;
1844 char *b = NULL, *p;
1845 struct elfhints_hdr hdr;
1846
1847 fp = fopenat_r(root_fd, root_rel_path(fname));
1848 if (fp == NULL)
1849 return -1;
1850
1851 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1852 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1853 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1854 {
1855 fclose(fp);
1856 return -1;
1857 }
1858
1859 b = xmalloc(hdr.dirlistlen + 1);
1860 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1861 fclose(fp);
1862 free(b);
1863 return -1;
1864 }
1865
1866 while ((p = strsep(&b, ":"))) {
1867 if (*p == '\0')
1868 continue;
1869 xarraypush_str(ldpaths, p);
1870 }
1871
1872 free(b);
1873 fclose(fp);
1874 return 0;
1875}
1876
1877#else
1878#ifdef __ELF__
1879#warning Cache config support not implemented for your target
1880#endif
1881static int _load_ld_cache_config(const char *fname)
1882{
1883 return 0;
1884}
1885#endif
1886
1887static void load_ld_cache_config(const char *fname)
1888{
1889 bool scan_l, scan_ul, scan_ull;
1890 size_t n;
1891 const char *ldpath;
1892
1893 _load_ld_cache_config(fname);
1894
1895 scan_l = scan_ul = scan_ull = false;
1896 if (array_cnt(ldpaths)) {
1897 array_for_each(ldpaths, n, ldpath) {
1898 if (!scan_l && !strcmp(ldpath, "/lib")) scan_l = true;
1899 if (!scan_ul && !strcmp(ldpath, "/usr/lib")) scan_ul = true;
1900 if (!scan_ull && !strcmp(ldpath, "/usr/local/lib")) scan_ull = true;
1901 }
1902 }
1903
1904 if (!scan_l) xarraypush_str(ldpaths, "/lib");
1905 if (!scan_ul) xarraypush_str(ldpaths, "/usr/lib");
1906 if (!scan_ull) xarraypush_str(ldpaths, "/usr/local/lib");
493} 1907}
494 1908
495/* scan /etc/ld.so.conf for paths */ 1909/* scan /etc/ld.so.conf for paths */
496static void scanelf_ldpath() 1910static void scanelf_ldpath(void)
497{ 1911{
498 char scan_l, scan_ul, scan_ull; 1912 size_t n;
499 char *path, *p; 1913 const char *ldpath;
500 FILE *fp;
501 1914
502 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1915 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); 1916 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} 1917}
526 1918
527/* scan env PATH for paths */ 1919/* scan env PATH for paths */
528static void scanelf_envpath() 1920static void scanelf_envpath(void)
529{ 1921{
530 char *path, *p; 1922 char *path, *p;
531 1923
532 path = getenv("PATH"); 1924 path = getenv("PATH");
533 if (!path) 1925 if (!path)
540 } 1932 }
541 1933
542 free(path); 1934 free(path);
543} 1935}
544 1936
545 1937/* 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" 1938#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZCBhV"
549#define a_argument required_argument 1939#define a_argument required_argument
550static struct option const long_opts[] = { 1940static struct option const long_opts[] = {
551 {"path", no_argument, NULL, 'p'}, 1941 {"path", no_argument, NULL, 'p'},
552 {"ldpath", no_argument, NULL, 'l'}, 1942 {"ldpath", no_argument, NULL, 'l'},
1943 {"use-ldpath",no_argument, NULL, 129},
1944 {"root", a_argument, NULL, 128},
553 {"recursive", no_argument, NULL, 'R'}, 1945 {"recursive", no_argument, NULL, 'R'},
554 {"mount", no_argument, NULL, 'm'}, 1946 {"mount", no_argument, NULL, 'm'},
555 {"symlink", no_argument, NULL, 'y'}, 1947 {"symlink", no_argument, NULL, 'y'},
1948 {"archives", no_argument, NULL, 'A'},
1949 {"ldcache", no_argument, NULL, 'L'},
1950 {"fix", no_argument, NULL, 'X'},
1951 {"setpax", a_argument, NULL, 'z'},
556 {"pax", no_argument, NULL, 'x'}, 1952 {"pax", no_argument, NULL, 'x'},
557 {"header", no_argument, NULL, 'e'}, 1953 {"header", no_argument, NULL, 'e'},
558 {"textrel", no_argument, NULL, 't'}, 1954 {"textrel", no_argument, NULL, 't'},
559 {"rpath", no_argument, NULL, 'r'}, 1955 {"rpath", no_argument, NULL, 'r'},
560 {"needed", no_argument, NULL, 'n'}, 1956 {"needed", no_argument, NULL, 'n'},
561 {"interp", no_argument, NULL, 'i'}, 1957 {"interp", no_argument, NULL, 'i'},
1958 {"bind", no_argument, NULL, 'b'},
1959 {"soname", no_argument, NULL, 'S'},
562 {"symbol", a_argument, NULL, 's'}, 1960 {"symbol", a_argument, NULL, 's'},
1961 {"section", a_argument, NULL, 'k'},
1962 {"lib", a_argument, NULL, 'N'},
1963 {"gmatch", no_argument, NULL, 'g'},
1964 {"textrels", no_argument, NULL, 'T'},
1965 {"etype", a_argument, NULL, 'E'},
1966 {"bits", a_argument, NULL, 'M'},
1967 {"endian", no_argument, NULL, 'D'},
1968 {"osabi", no_argument, NULL, 'I'},
1969 {"eabi", no_argument, NULL, 'Y'},
1970 {"perms", a_argument, NULL, 'O'},
1971 {"size", no_argument, NULL, 'Z'},
563 {"all", no_argument, NULL, 'a'}, 1972 {"all", no_argument, NULL, 'a'},
564 {"quiet", no_argument, NULL, 'q'}, 1973 {"quiet", no_argument, NULL, 'q'},
565 {"verbose", no_argument, NULL, 'v'}, 1974 {"verbose", no_argument, NULL, 'v'},
566 {"format", a_argument, NULL, 'F'}, 1975 {"format", a_argument, NULL, 'F'},
1976 {"from", a_argument, NULL, 'f'},
567 {"file", a_argument, NULL, 'o'}, 1977 {"file", a_argument, NULL, 'o'},
1978 {"nocolor", no_argument, NULL, 'C'},
568 {"nobanner", no_argument, NULL, 'B'}, 1979 {"nobanner", no_argument, NULL, 'B'},
569 {"help", no_argument, NULL, 'h'}, 1980 {"help", no_argument, NULL, 'h'},
570 {"version", no_argument, NULL, 'V'}, 1981 {"version", no_argument, NULL, 'V'},
571 {NULL, no_argument, NULL, 0x0} 1982 {NULL, no_argument, NULL, 0x0}
572}; 1983};
1984
573static char *opts_help[] = { 1985static const char * const opts_help[] = {
574 "Scan all directories in PATH environment", 1986 "Scan all directories in PATH environment",
575 "Scan all directories in /etc/ld.so.conf", 1987 "Scan all directories in /etc/ld.so.conf",
1988 "Use ld.so.conf to show full path (use with -r/-n)",
1989 "Root directory (use with -l or -p)",
576 "Scan directories recursively", 1990 "Scan directories recursively",
577 "Don't recursively cross mount points", 1991 "Don't recursively cross mount points",
578 "Don't scan symlinks\n", 1992 "Don't scan symlinks",
1993 "Scan archives (.a files)",
1994 "Utilize ld.so.cache to show full path (use with -r/-n)",
1995 "Try and 'fix' bad things (use with -r/-e)",
1996 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
579 "Print PaX markings", 1997 "Print PaX markings",
580 "Print GNU_STACK markings", 1998 "Print GNU_STACK/PT_LOAD markings",
581 "Print TEXTREL information", 1999 "Print TEXTREL information",
582 "Print RPATH information", 2000 "Print RPATH information",
583 "Print NEEDED information", 2001 "Print NEEDED information",
584 "Print INTERP information", 2002 "Print INTERP information",
2003 "Print BIND information",
2004 "Print SONAME information",
585 "Find a specified symbol", 2005 "Find a specified symbol",
586 "Print all scanned info (-x -e -t -r)\n", 2006 "Find a specified section",
2007 "Find a specified library",
2008 "Use regex rather than string compare (with -s); specify twice for case insensitive",
2009 "Locate cause of TEXTREL",
2010 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
2011 "Print only ELF files matching numeric bits",
2012 "Print Endianness",
2013 "Print OSABI",
2014 "Print EABI (EM_ARM Only)",
2015 "Print only ELF files matching octal permissions",
2016 "Print ELF file size",
2017 "Print all useful/simple info\n",
587 "Only output 'bad' things", 2018 "Only output 'bad' things",
588 "Be verbose (can be specified more than once)", 2019 "Be verbose (can be specified more than once)",
589 "Use specified format for output", 2020 "Use specified format for output",
2021 "Read input stream from a filename",
590 "Write output stream to a filename", 2022 "Write output stream to a filename",
2023 "Don't emit color in output",
591 "Don't display the header", 2024 "Don't display the header",
592 "Print this help and exit", 2025 "Print this help and exit",
593 "Print version and exit", 2026 "Print version and exit",
594 NULL 2027 NULL
595}; 2028};
596 2029
597/* display usage and exit */ 2030/* display usage and exit */
598static void usage(int status) 2031static void usage(int status)
599{ 2032{
600 unsigned long i; 2033 const char a_arg[] = "<arg>";
2034 size_t a_arg_len = strlen(a_arg) + 2;
2035 size_t i;
2036 int optlen;
601 printf(" Scan ELF binaries for stuff\n\n" 2037 printf("* Scan ELF binaries for stuff\n\n"
602 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0); 2038 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
603 printf("Options: -[%s]\n", PARSE_FLAGS); 2039 printf("Options: -[%s]\n", PARSE_FLAGS);
2040
2041 /* prescan the --long opt length to auto-align */
2042 optlen = 0;
604 for (i = 0; long_opts[i].name; ++i) 2043 for (i = 0; long_opts[i].name; ++i) {
2044 int l = strlen(long_opts[i].name);
2045 if (long_opts[i].has_arg == a_argument)
2046 l += a_arg_len;
2047 optlen = max(l, optlen);
2048 }
2049
2050 for (i = 0; long_opts[i].name; ++i) {
2051 /* first output the short flag if it has one */
2052 if (long_opts[i].val > '~')
2053 printf(" ");
2054 else
2055 printf(" -%c, ", long_opts[i].val);
2056
2057 /* then the long flag */
605 if (long_opts[i].has_arg == no_argument) 2058 if (long_opts[i].has_arg == no_argument)
606 printf(" -%c, --%-13s %s\n", long_opts[i].val, 2059 printf("--%-*s", optlen, long_opts[i].name);
607 long_opts[i].name, opts_help[i]);
608 else 2060 else
609 printf(" -%c, --%-6s <arg> %s\n", long_opts[i].val, 2061 printf("--%s %s %*s", long_opts[i].name, a_arg,
610 long_opts[i].name, opts_help[i]); 2062 (int)(optlen - strlen(long_opts[i].name) - a_arg_len), "");
2063
2064 /* finally the help text */
2065 printf("* %s\n", opts_help[i]);
2066 }
2067
2068 puts("\nFor more information, see the scanelf(1) manpage");
611 exit(status); 2069 exit(status);
612} 2070}
613 2071
614/* parse command line arguments and preform needed actions */ 2072/* parse command line arguments and preform needed actions */
2073#define do_pax_state(option, flag) \
2074 if (islower(option)) { \
2075 flags &= ~PF_##flag; \
2076 flags |= PF_NO##flag; \
2077 } else { \
2078 flags &= ~PF_NO##flag; \
2079 flags |= PF_##flag; \
2080 }
615static void parseargs(int argc, char *argv[]) 2081static int parseargs(int argc, char *argv[])
616{ 2082{
617 int flag; 2083 int i;
2084 const char *from_file = NULL;
2085 int ret = 0;
2086 char load_cache_config = 0;
618 2087
619 opterr = 0; 2088 opterr = 0;
620 while ((flag=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 2089 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
621 switch (flag) { 2090 switch (i) {
622 2091
623 case 'V': 2092 case 'V':
624 printf("%s compiled %s\n%s\n" 2093 printf("pax-utils-%s: %s compiled %s\n%s\n"
625 "%s written for Gentoo Linux by <solar and vapier @ gentoo.org>\n", 2094 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
626 __FILE__, __DATE__, rcsid, argv0); 2095 VERSION, __FILE__, __DATE__, rcsid, argv0);
627 exit(EXIT_SUCCESS); 2096 exit(EXIT_SUCCESS);
628 break; 2097 break;
629 case 'h': usage(EXIT_SUCCESS); break; 2098 case 'h': usage(EXIT_SUCCESS); break;
630 2099 case 'f':
2100 if (from_file) warn("You prob don't want to specify -f twice");
2101 from_file = optarg;
2102 break;
2103 case 'E':
2104 match_etypes = optarg;
2105 break;
2106 case 'M':
2107 match_bits = atoi(optarg);
2108 if (match_bits == 0) {
2109 if (strcmp(optarg, "ELFCLASS32") == 0)
2110 match_bits = 32;
2111 if (strcmp(optarg, "ELFCLASS64") == 0)
2112 match_bits = 64;
2113 }
2114 break;
2115 case 'O':
2116 if (sscanf(optarg, "%o", &match_perms) == -1)
2117 match_bits = 0;
2118 break;
631 case 'o': { 2119 case 'o': {
632 FILE *fp = NULL;
633 fp = freopen(optarg, "w", stdout); 2120 if (freopen(optarg, "w", stdout) == NULL)
634 if (fp == NULL) 2121 errp("Could not freopen(%s)", optarg);
635 err("Could not open output stream '%s': %s", optarg, strerror(errno));
636 stdout = fp;
637 break; 2122 break;
638 } 2123 }
639 2124 case 'k':
2125 xarraypush_str(find_section_arr, optarg);
2126 break;
640 case 's': { 2127 case 's': {
641 size_t len; 2128 /* historically, this was comma delimited */
642 find_sym = xstrdup(optarg); 2129 char *this_sym = strtok(optarg, ",");
643 len = strlen(find_sym) + 1; 2130 if (!this_sym) /* edge case: -s '' */
644 versioned_symname = (char*)xmalloc(sizeof(char) * (len+1)); 2131 xarraypush_str(find_sym_arr, "");
645 sprintf(versioned_symname, "%s@", find_sym); 2132 while (this_sym) {
2133 xarraypush_str(find_sym_arr, this_sym);
2134 this_sym = strtok(NULL, ",");
2135 }
646 break; 2136 break;
647 } 2137 }
648 2138 case 'N':
2139 xarraypush_str(find_lib_arr, optarg);
2140 break;
649 case 'F': { 2141 case 'F': {
2142 if (out_format) warn("You prob don't want to specify -F twice");
650 out_format = strdup(optarg); 2143 out_format = optarg;
651 break; 2144 break;
652 } 2145 }
2146 case 'z': {
2147 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
2148 size_t x;
653 2149
2150 for (x = 0; x < strlen(optarg); x++) {
2151 switch (optarg[x]) {
2152 case 'p':
2153 case 'P':
2154 do_pax_state(optarg[x], PAGEEXEC);
2155 break;
2156 case 's':
2157 case 'S':
2158 do_pax_state(optarg[x], SEGMEXEC);
2159 break;
2160 case 'm':
2161 case 'M':
2162 do_pax_state(optarg[x], MPROTECT);
2163 break;
2164 case 'e':
2165 case 'E':
2166 do_pax_state(optarg[x], EMUTRAMP);
2167 break;
2168 case 'r':
2169 case 'R':
2170 do_pax_state(optarg[x], RANDMMAP);
2171 break;
2172 case 'x':
2173 case 'X':
2174 do_pax_state(optarg[x], RANDEXEC);
2175 break;
2176 default:
2177 break;
2178 }
2179 }
2180 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
2181 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
2182 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
2183 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
2184 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
2185 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
2186 setpax = flags;
2187 break;
2188 }
2189 case 'Z': show_size = 1; break;
2190 case 'g': ++g_match; break;
2191 case 'L': load_cache_config = use_ldcache = 1; break;
654 case 'y': scan_symlink = 0; break; 2192 case 'y': scan_symlink = 0; break;
2193 case 'A': scan_archives = 1; break;
2194 case 'C': color_init(true); break;
655 case 'B': show_banner = 0; break; 2195 case 'B': show_banner = 0; break;
656 case 'l': scan_ldpath = 1; break; 2196 case 'l': load_cache_config = scan_ldpath = 1; break;
657 case 'p': scan_envpath = 1; break; 2197 case 'p': scan_envpath = 1; break;
658 case 'R': dir_recurse = 1; break; 2198 case 'R': dir_recurse = 1; break;
659 case 'm': dir_crossmount = 0; break; 2199 case 'm': dir_crossmount = 0; break;
2200 case 'X': ++fix_elf; break;
660 case 'x': show_pax = 1; break; 2201 case 'x': show_pax = 1; break;
661 case 'e': show_stack = 1; break; 2202 case 'e': show_phdr = 1; break;
662 case 't': show_textrel = 1; break; 2203 case 't': show_textrel = 1; break;
663 case 'r': show_rpath = 1; break; 2204 case 'r': show_rpath = 1; break;
664 case 'n': show_needed = 1; break; 2205 case 'n': show_needed = 1; break;
665 case 'i': show_interp = 1; break; 2206 case 'i': show_interp = 1; break;
666 case 'q': be_quiet = 1; break; 2207 case 'b': show_bind = 1; break;
2208 case 'S': show_soname = 1; break;
2209 case 'T': show_textrels = 1; break;
2210 case 'q': be_quiet = min(be_quiet, 20) + 1; break;
667 case 'v': be_verbose = (be_verbose % 20) + 1; break; 2211 case 'v': be_verbose = min(be_verbose, 20) + 1; break;
668 case 'a': show_pax = show_stack = show_textrel = show_rpath = show_needed = show_interp = 1; break; 2212 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
669 2213 case 'D': show_endian = 1; break;
2214 case 'I': show_osabi = 1; break;
2215 case 'Y': show_eabi = 1; break;
2216 case 128:
2217 root_fd = open(optarg, O_RDONLY|O_CLOEXEC);
2218 if (root_fd == -1)
2219 err("Could not open root: %s", optarg);
2220 break;
2221 case 129: load_cache_config = use_ldpath = 1; break;
670 case ':': 2222 case ':':
671 warn("Option missing parameter\n"); 2223 err("Option '%c' is missing parameter", optopt);
672 usage(EXIT_FAILURE);
673 break;
674 case '?': 2224 case '?':
675 warn("Unknown option\n"); 2225 err("Unknown option '%c' or argument missing", optopt);
676 usage(EXIT_FAILURE);
677 break;
678 default: 2226 default:
679 err("Unhandled option '%c'", flag); 2227 err("Unhandled option '%c'; please report this", i);
2228 }
2229 }
2230 if (show_textrels && be_verbose)
2231 has_objdump = bin_in_path("objdump");
2232 /* precompile all the regexes */
2233 if (g_match) {
2234 regex_t preg;
2235 const char *this_sym;
2236 size_t n;
2237 int flags = REG_EXTENDED | REG_NOSUB | (g_match > 1 ? REG_ICASE : 0);
2238
2239 array_for_each(find_sym_arr, n, this_sym) {
2240 /* see scanelf_match_symname for logic info */
2241 switch (this_sym[0]) {
2242 case '%':
2243 while (*(this_sym++))
2244 if (*this_sym == '%') {
2245 ++this_sym;
2246 break;
2247 }
680 break; 2248 break;
2249 case '+':
2250 case '-':
2251 ++this_sym;
2252 break;
681 } 2253 }
2254 if (*this_sym == '*')
2255 ++this_sym;
2256
2257 ret = regcomp(&preg, this_sym, flags);
2258 if (ret) {
2259 char err[256];
2260 regerror(ret, &preg, err, sizeof(err));
2261 err("regcomp of %s failed: %s", this_sym, err);
2262 }
2263 xarraypush(find_sym_regex_arr, &preg, sizeof(preg));
682 } 2264 }
683 2265 }
684 if (be_quiet && be_verbose) 2266 /* flatten arrays for display */
685 err("You can be quiet or you can be verbose, not both, stupid"); 2267 if (array_cnt(find_sym_arr))
686 2268 find_sym = array_flatten_str(find_sym_arr);
2269 if (array_cnt(find_lib_arr))
2270 find_lib = array_flatten_str(find_lib_arr);
2271 if (array_cnt(find_section_arr))
2272 find_section = array_flatten_str(find_section_arr);
687 /* let the format option override all other options */ 2273 /* let the format option override all other options */
688 if (out_format) { 2274 if (out_format) {
689 show_pax = show_stack = show_textrel = show_rpath = show_needed = show_interp = 0; 2275 show_pax = show_phdr = show_textrel = show_rpath = \
2276 show_needed = show_interp = show_bind = show_soname = \
2277 show_textrels = show_perms = show_endian = show_size = \
2278 show_osabi = show_eabi = 0;
690 for (flag=0; out_format[flag]; ++flag) { 2279 for (i = 0; out_format[i]; ++i) {
691 if (out_format[flag] != '%') continue; 2280 if (!IS_MODIFIER(out_format[i])) continue;
692 2281
693 switch (out_format[++flag]) { 2282 switch (out_format[++i]) {
2283 case '+': break;
694 case '%': break; 2284 case '%': break;
2285 case '#': break;
695 case 'F': break; 2286 case 'F': break;
2287 case 'p': break;
2288 case 'f': break;
2289 case 'k': break;
696 case 's': break; 2290 case 's': break;
2291 case 'N': break;
697 case 'o': break; 2292 case 'o': break;
2293 case 'a': break;
2294 case 'M': break;
2295 case 'Z': show_size = 1; break;
2296 case 'D': show_endian = 1; break;
2297 case 'I': show_osabi = 1; break;
2298 case 'Y': show_eabi = 1; break;
2299 case 'O': show_perms = 1; break;
698 case 'x': show_pax = 1; break; 2300 case 'x': show_pax = 1; break;
699 case 'e': show_stack = 1; break; 2301 case 'e': show_phdr = 1; break;
700 case 't': show_textrel = 1; break; 2302 case 't': show_textrel = 1; break;
701 case 'r': show_rpath = 1; break; 2303 case 'r': show_rpath = 1; break;
702 case 'n': show_needed = 1; break; 2304 case 'n': show_needed = 1; break;
703 case 'i': show_interp = 1; break; 2305 case 'i': show_interp = 1; break;
2306 case 'b': show_bind = 1; break;
2307 case 'S': show_soname = 1; break;
2308 case 'T': show_textrels = 1; break;
704 default: 2309 default:
705 err("Invalid format specifier '%c' (byte %i)", 2310 err("invalid format specifier '%c' (byte %i)",
706 out_format[flag], flag+1); 2311 out_format[i], i+1);
707 } 2312 }
708 } 2313 }
709 2314
710 /* construct our default format */ 2315 /* construct our default format */
711 } else { 2316 } else {
712 size_t fmt_len = 30; 2317 size_t fmt_len = 30;
713 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 2318 out_format = xmalloc(sizeof(char) * fmt_len);
2319 *out_format = '\0';
714 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 2320 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
715 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len); 2321 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
2322 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
2323 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
2324 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
716 if (show_stack) xstrcat(&out_format, "%e ", &fmt_len); 2325 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
2326 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
2327 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
717 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 2328 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
718 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 2329 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
719 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 2330 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
720 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 2331 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
2332 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
2333 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
2334 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
721 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len); 2335 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
2336 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
2337 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
722 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 2338 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
723 } 2339 }
724 if (be_verbose > 2) printf("Format: %s\n", out_format); 2340 if (be_verbose > 2) printf("Format: %s\n", out_format);
725 2341
726 /* now lets actually do the scanning */ 2342 /* now lets actually do the scanning */
2343 if (load_cache_config)
2344 load_ld_cache_config(__PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
727 if (scan_ldpath) scanelf_ldpath(); 2345 if (scan_ldpath) scanelf_ldpath();
728 if (scan_envpath) scanelf_envpath(); 2346 if (scan_envpath) scanelf_envpath();
2347 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
2348 from_file = "-";
2349 if (from_file) {
2350 scanelf_from_file(from_file);
2351 from_file = *argv;
2352 }
729 if (optind == argc && !scan_ldpath && !scan_envpath) 2353 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
730 err("Nothing to scan !?"); 2354 err("Nothing to scan !?");
731 while (optind < argc) 2355 while (optind < argc) {
732 scanelf_dir(argv[optind++]); 2356 search_path = argv[optind++];
2357 ret = scanelf_dir(search_path);
2358 }
733 2359
2360#ifdef __PAX_UTILS_CLEANUP
734 /* clean up */ 2361 /* clean up */
735 if (find_sym) { 2362 xarrayfree(ldpaths);
2363 xarrayfree(find_sym_arr);
2364 xarrayfree(find_lib_arr);
2365 xarrayfree(find_section_arr);
736 free(find_sym); 2366 free(find_sym);
737 free(versioned_symname); 2367 free(find_lib);
2368 free(find_section);
2369 {
2370 size_t n;
2371 regex_t *preg;
2372 array_for_each(find_sym_regex_arr, n, preg)
2373 regfree(preg);
2374 xarrayfree(find_sym_regex_arr);
738 } 2375 }
739 if (out_format) free(out_format);
740}
741 2376
2377 if (ldcache != 0)
2378 munmap(ldcache, ldcache_size);
2379#endif
742 2380
743
744/* utility funcs */
745static char *xstrdup(char *s)
746{
747 char *ret = strdup(s);
748 if (!ret) err("Could not strdup(): %s", strerror(errno));
749 return ret; 2381 return ret;
750} 2382}
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 2383
761 new_len = strlen(*dst) + strlen(src); 2384static 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{ 2385{
773 static char my_app[2]; 2386 const char *delims = " \t\n";
774 my_app[0] = append; 2387 char **envvals = NULL;
775 my_app[1] = '\0'; 2388 char *env, *s;
776 xstrcat(dst, my_app, curr_len); 2389 int nentry;
777} 2390
778static int xemptybuffer(const char *buff) 2391 if ((env = getenv(envvar)) == NULL)
779{
780 long i;
781 for (i=0; buff[i]; ++i)
782 if (buff[i] != ' ')
783 return 0; 2392 return NULL;
2393
2394 env = xstrdup(env);
2395 if (env == NULL)
784 return 1; 2396 return NULL;
785}
786 2397
2398 s = strtok(env, delims);
2399 if (s == NULL) {
2400 free(env);
2401 return NULL;
2402 }
787 2403
2404 nentry = 0;
2405 while (s != NULL) {
2406 ++nentry;
2407 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
2408 envvals[nentry-1] = s;
2409 s = strtok(NULL, delims);
2410 }
2411 envvals[nentry] = NULL;
2412
2413 /* don't want to free(env) as it contains the memory that backs
2414 * the envvals array of strings */
2415 return envvals;
2416}
2417
2418static void parseenv(void)
2419{
2420 color_init(false);
2421 qa_textrels = get_split_env("QA_TEXTRELS");
2422 qa_execstack = get_split_env("QA_EXECSTACK");
2423 qa_wx_load = get_split_env("QA_WX_LOAD");
2424}
2425
2426#ifdef __PAX_UTILS_CLEANUP
2427static void cleanup(void)
2428{
2429 free(out_format);
2430 free(qa_textrels);
2431 free(qa_execstack);
2432 free(qa_wx_load);
2433}
2434#endif
788 2435
789int main(int argc, char *argv[]) 2436int main(int argc, char *argv[])
790{ 2437{
2438 int ret;
791 if (argc < 2) 2439 if (argc < 2)
792 usage(EXIT_FAILURE); 2440 usage(EXIT_FAILURE);
2441 parseenv();
793 parseargs(argc, argv); 2442 ret = parseargs(argc, argv);
794 fclose(stdout); 2443 fclose(stdout);
795 return EXIT_SUCCESS; 2444#ifdef __PAX_UTILS_CLEANUP
2445 cleanup();
2446 warn("The calls to add/delete heap should be off:\n"
2447 "\t- 1 due to the out_buffer not being freed in scanelf_fileat()\n"
2448 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
2449#endif
2450 return ret;
796} 2451}
2452
2453/* Match filename against entries in matchlist, return TRUE
2454 * if the file is listed */
2455static int file_matches_list(const char *filename, char **matchlist)
2456{
2457 char **file;
2458 char *match;
2459 char buf[__PAX_UTILS_PATH_MAX];
2460
2461 if (matchlist == NULL)
2462 return 0;
2463
2464 for (file = matchlist; *file != NULL; file++) {
2465 if (search_path) {
2466 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2467 match = buf;
2468 } else {
2469 match = *file;
2470 }
2471 if (fnmatch(match, filename, 0) == 0)
2472 return 1;
2473 }
2474 return 0;
2475}

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