/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.44 Revision 1.260
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 1.260 2014/01/11 00:28:49 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 1.260 2014/01/11 00:28:49 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 /* let's flag -w/+x object files since the final ELF will most likely \
383 * need write access to the stack (who doesn't !?). so the combined \
384 * output will bring in +w automatically and that's bad. \
385 */ \
386 check_flags = /*SHF_WRITE|*/SHF_EXECINSTR; \
387 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
388 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
389 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
390 str = elf->data + offset; \
391 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
392 if (!strcmp(str, NOTE_GNU_STACK)) { \
393 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
394 flags = EGET(shdr[i].sh_flags); \
395 if (be_quiet && ((flags & check_flags) != check_flags)) \
396 continue; \
397 ++*found_phdr; \
398 shown = 1; \
399 if (flags & SHF_WRITE) ret[0] = 'W'; \
400 if (flags & SHF_ALLOC) ret[1] = 'A'; \
401 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
402 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
403 break; \
404 } \
405 } \
406 skip_this_shdr##B: \
407 if (!multi_stack) { \
408 if (file_matches_list(elf->filename, qa_execstack)) \
409 return NULL; \
410 *found_phdr = 1; \
411 shown = 1; \
412 memcpy(ret, "!WX", 3); \
413 } \
414 } \
415 }
416 SHOW_PHDR(32)
417 SHOW_PHDR(64)
418
419 if (be_wewy_wewy_quiet || (be_quiet && !shown))
420 return NULL;
421 else
422 return ret;
423}
424
425/*
426 * See if this ELF contains a DT_TEXTREL tag in any of its
427 * PT_DYNAMIC sections.
428 */
132static char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 429static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
133{ 430{
134 static char *ret = "TEXTREL"; 431 static const char *ret = "TEXTREL";
135 unsigned long i; 432 unsigned long i;
136 433
137 if (!show_textrel) return NULL; 434 if (!show_textrel && !show_textrels) return NULL;
435
436 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
138 437
139 if (elf->phdr) { 438 if (elf->phdr) {
140#define SHOW_TEXTREL(B) \ 439#define SHOW_TEXTREL(B) \
141 if (elf->elf_class == ELFCLASS ## B) { \ 440 if (elf->elf_class == ELFCLASS ## B) { \
142 Elf ## B ## _Dyn *dyn; \ 441 Elf ## B ## _Dyn *dyn; \
143 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 442 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
144 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 443 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
145 Elf ## B ## _Off offset; \ 444 Elf ## B ## _Off offset; \
146 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 445 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
147 if (phdr[i].p_type != PT_DYNAMIC) continue; \ 446 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
148 offset = EGET(phdr[i].p_offset); \ 447 offset = EGET(phdr[i].p_offset); \
149 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 448 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
150 dyn = DYN ## B (elf->data + offset); \ 449 dyn = DYN ## B (elf->vdata + offset); \
151 while (EGET(dyn->d_tag) != DT_NULL) { \ 450 while (EGET(dyn->d_tag) != DT_NULL) { \
152 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \ 451 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
153 *found_textrel = 1; \ 452 *found_textrel = 1; \
154 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \ 453 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
155 return ret; \ 454 return (be_wewy_wewy_quiet ? NULL : ret); \
156 } \ 455 } \
157 ++dyn; \ 456 ++dyn; \
158 } \ 457 } \
159 } } 458 } }
160 SHOW_TEXTREL(32) 459 SHOW_TEXTREL(32)
161 SHOW_TEXTREL(64) 460 SHOW_TEXTREL(64)
162 } 461 }
163 462
164 if (be_quiet) 463 if (be_quiet || be_wewy_wewy_quiet)
165 return NULL; 464 return NULL;
166 else 465 else
167 return " - "; 466 return " - ";
168} 467}
468
469/*
470 * Scan the .text section to see if there are any relocations in it.
471 * Should rewrite this to check PT_LOAD sections that are marked
472 * Executable rather than the section named '.text'.
473 */
474static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
475{
476 unsigned long s, r, rmax;
477 void *symtab_void, *strtab_void, *text_void;
478
479 if (!show_textrels) return NULL;
480
481 /* don't search for TEXTREL's if the ELF doesn't have any */
482 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
483 if (!*found_textrel) return NULL;
484
485 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
486 text_void = elf_findsecbyname(elf, ".text");
487
488 if (symtab_void && strtab_void && text_void && elf->shdr) {
489#define SHOW_TEXTRELS(B) \
490 if (elf->elf_class == ELFCLASS ## B) { \
491 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
492 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
493 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
494 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
495 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
496 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
497 uint ## B ## _t memsz = EGET(text->sh_size); \
498 Elf ## B ## _Rel *rel; \
499 Elf ## B ## _Rela *rela; \
500 /* search the section headers for relocations */ \
501 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
502 uint32_t sh_type = EGET(shdr[s].sh_type); \
503 if (sh_type == SHT_REL) { \
504 rel = REL ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
505 rela = NULL; \
506 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
507 } else if (sh_type == SHT_RELA) { \
508 rel = NULL; \
509 rela = RELA ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
510 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
511 } else \
512 continue; \
513 /* now see if any of the relocs are in the .text */ \
514 for (r = 0; r < rmax; ++r) { \
515 unsigned long sym_max; \
516 Elf ## B ## _Addr offset_tmp; \
517 Elf ## B ## _Sym *func; \
518 Elf ## B ## _Sym *sym; \
519 Elf ## B ## _Addr r_offset; \
520 uint ## B ## _t r_info; \
521 if (sh_type == SHT_REL) { \
522 r_offset = EGET(rel[r].r_offset); \
523 r_info = EGET(rel[r].r_info); \
524 } else { \
525 r_offset = EGET(rela[r].r_offset); \
526 r_info = EGET(rela[r].r_info); \
527 } \
528 /* make sure this relocation is inside of the .text */ \
529 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
530 if (be_verbose <= 2) continue; \
531 } else \
532 *found_textrels = 1; \
533 /* locate this relocation symbol name */ \
534 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
535 if ((void*)sym > elf->data_end) { \
536 warn("%s: corrupt ELF symbol", elf->filename); \
537 continue; \
538 } \
539 sym_max = ELF ## B ## _R_SYM(r_info); \
540 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
541 sym += sym_max; \
542 else \
543 sym = NULL; \
544 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
545 /* show the raw details about this reloc */ \
546 printf(" %s: ", elf->base_filename); \
547 if (sym && sym->st_name) \
548 printf("%s", elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
549 else \
550 printf("(memory/data?)"); \
551 printf(" [0x%lX]", (unsigned long)r_offset); \
552 /* now try to find the closest symbol that this rel is probably in */ \
553 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
554 func = NULL; \
555 offset_tmp = 0; \
556 while (sym_max--) { \
557 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
558 func = sym; \
559 offset_tmp = EGET(sym->st_value); \
560 } \
561 ++sym; \
562 } \
563 printf(" in "); \
564 if (func && func->st_name) { \
565 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
566 if (r_offset > EGET(func->st_size)) \
567 printf("(optimized out: previous %s)", func_name); \
568 else \
569 printf("%s", func_name); \
570 } else \
571 printf("(optimized out)"); \
572 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
573 if (be_verbose && has_objdump) { \
574 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
575 char *sysbuf; \
576 size_t syslen; \
577 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"; \
578 syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
579 sysbuf = xmalloc(syslen); \
580 if (end_addr < r_offset) \
581 /* not uncommon when things are optimized out */ \
582 end_addr = r_offset + 0x100; \
583 snprintf(sysbuf, syslen, sysfmt, \
584 (unsigned long)offset_tmp, \
585 (unsigned long)end_addr, \
586 elf->filename, \
587 (unsigned long)r_offset); \
588 fflush(stdout); \
589 if (system(sysbuf)) {/* don't care */} \
590 fflush(stdout); \
591 free(sysbuf); \
592 } \
593 } \
594 } }
595 SHOW_TEXTRELS(32)
596 SHOW_TEXTRELS(64)
597 }
598 if (!*found_textrels)
599 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
600
601 return NULL;
602}
603
604static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
605{
606 struct stat st;
607 switch (*item) {
608 case '/': break;
609 case '.':
610 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
611 break;
612 case ':':
613 case '\0':
614 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
615 break;
616 case '$':
617 if (fstat(elf->fd, &st) != -1)
618 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
619 warnf("Security problem with %s='%s' in %s with mode set of %o",
620 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
621 break;
622 default:
623 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
624 break;
625 }
626}
169static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len) 627static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
170{ 628{
171 /* TODO: if be_quiet, only output RPATH's which aren't in /etc/ld.so.conf */
172 unsigned long i; 629 unsigned long i;
173 char *rpath, *runpath; 630 char *rpath, *runpath, **r;
174 void *strtbl_void; 631 void *strtbl_void;
175 632
176 if (!show_rpath) return; 633 if (!show_rpath) return;
177 634
178 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 635 strtbl_void = elf_findsecbyname(elf, ".dynstr");
184 Elf ## B ## _Dyn *dyn; \ 641 Elf ## B ## _Dyn *dyn; \
185 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 642 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
186 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 643 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
187 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 644 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
188 Elf ## B ## _Off offset; \ 645 Elf ## B ## _Off offset; \
646 Elf ## B ## _Xword word; \
647 /* Scan all the program headers */ \
189 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 648 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
649 /* Just scan dynamic headers */ \
190 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 650 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
191 offset = EGET(phdr[i].p_offset); \ 651 offset = EGET(phdr[i].p_offset); \
192 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 652 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
653 /* Just scan dynamic RPATH/RUNPATH headers */ \
193 dyn = DYN ## B (elf->data + offset); \ 654 dyn = DYN ## B (elf->vdata + offset); \
194 while (EGET(dyn->d_tag) != DT_NULL) { \ 655 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
195 if (EGET(dyn->d_tag) == DT_RPATH) { \ 656 if (word == DT_RPATH) { \
196 if (rpath) warn("ELF has multiple DT_RPATH's !?"); \ 657 r = &rpath; \
658 } else if (word == DT_RUNPATH) { \
659 r = &runpath; \
660 } else { \
661 ++dyn; \
662 continue; \
663 } \
664 /* Verify the memory is somewhat sane */ \
197 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 665 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
198 if (offset >= elf->len) continue; \ 666 if (offset < (Elf ## B ## _Off)elf->len) { \
667 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
199 rpath = (char*)(elf->data + offset); \ 668 *r = elf->data + offset; \
669 /* cache the length in case we need to nuke this section later on */ \
670 if (fix_elf) \
671 offset = strlen(*r); \
672 /* If quiet, don't output paths in ld.so.conf */ \
673 if (be_quiet) { \
674 size_t len; \
675 char *start, *end; \
676 /* note that we only 'chop' off leading known paths. */ \
677 /* since *r is read-only memory, we can only move the ptr forward. */ \
678 start = *r; \
679 /* scan each path in : delimited list */ \
680 while (start) { \
681 rpath_security_checks(elf, start, get_elfdtype(word)); \
682 end = strchr(start, ':'); \
683 len = (end ? abs(end - start) : strlen(start)); \
684 if (use_ldcache) { \
685 size_t n; \
686 const char *ldpath; \
687 array_for_each(ldpaths, n, ldpath) \
688 if (!strncmp(ldpath, start, len) && !ldpath[len]) { \
689 *r = end; \
690 /* corner case ... if RPATH reads "/usr/lib:", we want \
691 * to show ':' rather than '' */ \
692 if (end && end[1] != '\0') \
693 (*r)++; \
694 break; \
695 } \
696 } \
697 if (!*r || !end) \
698 break; \
699 else \
700 start = start + len + 1; \
701 } \
702 } \
703 if (*r) { \
704 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
705 /* just nuke it */ \
706 nuke_it##B: \
707 memset(*r, 0x00, offset); \
708 *r = NULL; \
709 ESET(dyn->d_tag, DT_DEBUG); \
710 ESET(dyn->d_un.d_ptr, 0); \
711 } else if (fix_elf) { \
712 /* try to clean "bad" paths */ \
713 size_t len, tmpdir_len; \
714 char *start, *end; \
715 const char *tmpdir; \
716 start = *r; \
717 tmpdir = (getenv("TMPDIR") ? : "."); \
718 tmpdir_len = strlen(tmpdir); \
719 while (1) { \
720 end = strchr(start, ':'); \
721 if (start == end) { \
722 eat_this_path##B: \
723 len = strlen(end); \
724 memmove(start, end+1, len); \
725 start[len-1] = '\0'; \
726 end = start - 1; \
727 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
728 if (!end) { \
729 if (start == *r) \
730 goto nuke_it##B; \
731 *--start = '\0'; \
732 } else \
733 goto eat_this_path##B; \
734 } \
735 if (!end) \
736 break; \
737 start = end + 1; \
738 } \
739 if (**r == '\0') \
740 goto nuke_it##B; \
741 } \
742 if (*r) \
200 *found_rpath = 1; \ 743 *found_rpath = 1; \
201 } else if (EGET(dyn->d_tag) == DT_RUNPATH) { \ 744 } \
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 } \ 745 } \
208 ++dyn; \ 746 ++dyn; \
209 } \ 747 } \
210 } } 748 } }
211 SHOW_RPATH(32) 749 SHOW_RPATH(32)
212 SHOW_RPATH(64) 750 SHOW_RPATH(64)
213 } 751 }
752
753 if (be_wewy_wewy_quiet) return;
214 754
215 if (rpath && runpath) { 755 if (rpath && runpath) {
216 if (!strcmp(rpath, runpath)) { 756 if (!strcmp(rpath, runpath)) {
217 xstrcat(ret, runpath, ret_len); 757 xstrcat(ret, runpath, ret_len);
218 } else { 758 } else {
226 } else if (rpath || runpath) 766 } else if (rpath || runpath)
227 xstrcat(ret, (runpath ? runpath : rpath), ret_len); 767 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
228 else if (!be_quiet) 768 else if (!be_quiet)
229 xstrcat(ret, " - ", ret_len); 769 xstrcat(ret, " - ", ret_len);
230} 770}
771
772/* Defines can be seen in glibc's sysdeps/generic/ldconfig.h */
773#define LDSO_CACHE_MAGIC "ld.so-"
774#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
775#define LDSO_CACHE_VER "1.7.0"
776#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
777#define FLAG_ANY -1
778#define FLAG_TYPE_MASK 0x00ff
779#define FLAG_LIBC4 0x0000
780#define FLAG_ELF 0x0001
781#define FLAG_ELF_LIBC5 0x0002
782#define FLAG_ELF_LIBC6 0x0003
783#define FLAG_REQUIRED_MASK 0xff00
784#define FLAG_SPARC_LIB64 0x0100
785#define FLAG_IA64_LIB64 0x0200
786#define FLAG_X8664_LIB64 0x0300
787#define FLAG_S390_LIB64 0x0400
788#define FLAG_POWERPC_LIB64 0x0500
789#define FLAG_MIPS64_LIBN32 0x0600
790#define FLAG_MIPS64_LIBN64 0x0700
791#define FLAG_X8664_LIBX32 0x0800
792#define FLAG_ARM_LIBHF 0x0900
793#define FLAG_AARCH64_LIB64 0x0a00
794
795#if defined(__GLIBC__) || defined(__UCLIBC__)
796
797static char *lookup_cache_lib(elfobj *elf, const char *fname)
798{
799 int fd;
800 char *strs;
801 static char buf[__PAX_UTILS_PATH_MAX] = "";
802 const char *cachefile = root_rel_path("/etc/ld.so.cache");
803 struct stat st;
804
805 typedef struct {
806 char magic[LDSO_CACHE_MAGIC_LEN];
807 char version[LDSO_CACHE_VER_LEN];
808 int nlibs;
809 } header_t;
810 header_t *header;
811
812 typedef struct {
813 int flags;
814 int sooffset;
815 int liboffset;
816 } libentry_t;
817 libentry_t *libent;
818
819 if (fname == NULL)
820 return NULL;
821
822 if (ldcache == NULL) {
823 if (fstatat(root_fd, cachefile, &st, 0))
824 return NULL;
825
826 fd = openat(root_fd, cachefile, O_RDONLY);
827 if (fd == -1)
828 return NULL;
829
830 /* cache these values so we only map/unmap the cache file once */
831 ldcache_size = st.st_size;
832 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
833 close(fd);
834
835 if (ldcache == MAP_FAILED) {
836 ldcache = NULL;
837 return NULL;
838 }
839
840 if (memcmp(header->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN) ||
841 memcmp(header->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
842 {
843 munmap(ldcache, ldcache_size);
844 ldcache = NULL;
845 return NULL;
846 }
847 } else
848 header = ldcache;
849
850 libent = ldcache + sizeof(header_t);
851 strs = (char *) &libent[header->nlibs];
852
853 for (fd = 0; fd < header->nlibs; ++fd) {
854 /* This should be more fine grained, but for now we assume that
855 * diff arches will not be cached together, and we ignore the
856 * the different multilib mips cases.
857 */
858 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
859 continue;
860 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
861 continue;
862
863 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
864 continue;
865
866 /* Return first hit because that is how the ldso rolls */
867 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
868 break;
869 }
870
871 return buf;
872}
873
874#elif defined(__NetBSD__)
875static char *lookup_cache_lib(elfobj *elf, const char *fname)
876{
877 static char buf[__PAX_UTILS_PATH_MAX] = "";
878 static struct stat st;
879 size_t n;
880 char *ldpath;
881
882 array_for_each(ldpath, n, ldpath) {
883 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", ldpath, fname) >= sizeof(buf))
884 continue; /* if the pathname is too long, or something went wrong, ignore */
885
886 if (stat(buf, &st) != 0)
887 continue; /* if the lib doesn't exist in *ldpath, look further */
888
889 /* NetBSD doesn't actually do sanity checks, it just loads the file
890 * and if that doesn't work, continues looking in other directories.
891 * This cannot easily be safely emulated, unfortunately. For now,
892 * just assume that if it exists, it's a valid library. */
893
894 return buf;
895 }
896
897 /* not found in any path */
898 return NULL;
899}
900#else
901#ifdef __ELF__
902#warning Cache support not implemented for your target
903#endif
904static char *lookup_cache_lib(elfobj *elf, const char *fname)
905{
906 return NULL;
907}
908#endif
909
910static char *lookup_config_lib(const char *fname)
911{
912 static char buf[__PAX_UTILS_PATH_MAX] = "";
913 const char *ldpath;
914 size_t n;
915
916 array_for_each(ldpaths, n, ldpath) {
917 snprintf(buf, sizeof(buf), "%s/%s", root_rel_path(ldpath), fname);
918 if (faccessat(root_fd, buf, F_OK, AT_SYMLINK_NOFOLLOW) == 0)
919 return buf;
920 }
921
922 return NULL;
923}
924
231static void scanelf_file_needed(elfobj *elf, char *found_needed, char **ret, size_t *ret_len) 925static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
232{ 926{
233 unsigned long i; 927 unsigned long i;
234 char *needed; 928 char *needed;
235 void *strtbl_void; 929 void *strtbl_void;
930 char *p;
236 931
237 if (!show_needed) return; 932 /*
933 * -n -> op==0 -> print all
934 * -N -> op==1 -> print requested
935 */
936 if ((op == 0 && !show_needed) || (op == 1 && !find_lib))
937 return NULL;
238 938
239 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 939 strtbl_void = elf_findsecbyname(elf, ".dynstr");
240 940
241 if (elf->phdr && strtbl_void) { 941 if (elf->phdr && strtbl_void) {
242#define SHOW_NEEDED(B) \ 942#define SHOW_NEEDED(B) \
244 Elf ## B ## _Dyn *dyn; \ 944 Elf ## B ## _Dyn *dyn; \
245 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 945 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
246 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 946 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
247 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 947 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
248 Elf ## B ## _Off offset; \ 948 Elf ## B ## _Off offset; \
949 size_t matched = 0; \
950 /* Walk all the program headers to find the PT_DYNAMIC */ \
249 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 951 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
250 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 952 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) \
953 continue; \
251 offset = EGET(phdr[i].p_offset); \ 954 offset = EGET(phdr[i].p_offset); \
252 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 955 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
956 continue; \
957 /* Walk all the dynamic tags to find NEEDED entries */ \
253 dyn = DYN ## B (elf->data + offset); \ 958 dyn = DYN ## B (elf->vdata + offset); \
254 while (EGET(dyn->d_tag) != DT_NULL) { \ 959 while (EGET(dyn->d_tag) != DT_NULL) { \
255 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 960 if (EGET(dyn->d_tag) == DT_NEEDED) { \
256 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 961 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
257 if (offset >= elf->len) continue; \ 962 if (offset >= (Elf ## B ## _Off)elf->len) { \
963 ++dyn; \
964 continue; \
965 } \
258 needed = (char*)(elf->data + offset); \ 966 needed = elf->data + offset; \
967 if (op == 0) { \
968 /* -n -> print all entries */ \
969 if (!be_wewy_wewy_quiet) { \
259 if (*found_needed) xchrcat(ret, ',', ret_len); \ 970 if (*found_needed) xchrcat(ret, ',', ret_len); \
971 if (use_ldpath) { \
972 if ((p = lookup_config_lib(needed)) != NULL) \
973 needed = p; \
974 } else if (use_ldcache) { \
975 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
976 needed = p; \
977 } \
260 xstrcat(ret, needed, ret_len); \ 978 xstrcat(ret, needed, ret_len); \
979 } \
261 *found_needed = 1; \ 980 *found_needed = 1; \
981 } else { \
982 /* -N -> print matching entries */ \
983 size_t n; \
984 const char *find_lib_name; \
985 \
986 array_for_each(find_lib_arr, n, find_lib_name) { \
987 int invert = 1; \
988 if (find_lib_name[0] == '!') \
989 invert = 0, ++find_lib_name; \
990 if (!strcmp(find_lib_name, needed) == invert) \
991 ++matched; \
992 } \
993 \
994 if (matched == array_cnt(find_lib_arr)) { \
995 *found_lib = 1; \
996 return (be_wewy_wewy_quiet ? NULL : find_lib); \
997 } \
998 } \
262 } \ 999 } \
263 ++dyn; \ 1000 ++dyn; \
264 } \ 1001 } \
265 } } 1002 } }
266 SHOW_NEEDED(32) 1003 SHOW_NEEDED(32)
267 SHOW_NEEDED(64) 1004 SHOW_NEEDED(64)
1005 if (op == 0 && !*found_needed && be_verbose)
1006 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
268 } 1007 }
1008
1009 return NULL;
269} 1010}
270static char *scanelf_file_interp(elfobj *elf, char *found_interp) 1011static char *scanelf_file_interp(elfobj *elf, char *found_interp)
271{ 1012{
272 void *strtbl_void; 1013 void *strtbl_void;
273 1014
278 if (strtbl_void) { 1019 if (strtbl_void) {
279#define SHOW_INTERP(B) \ 1020#define SHOW_INTERP(B) \
280 if (elf->elf_class == ELFCLASS ## B) { \ 1021 if (elf->elf_class == ELFCLASS ## B) { \
281 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 1022 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
282 *found_interp = 1; \ 1023 *found_interp = 1; \
283 return elf->data + EGET(strtbl->sh_offset); \ 1024 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
284 } 1025 }
285 SHOW_INTERP(32) 1026 SHOW_INTERP(32)
286 SHOW_INTERP(64) 1027 SHOW_INTERP(64)
1028 } else {
1029 /* Walk all the program headers to find the PT_INTERP */
1030#define SHOW_PT_INTERP(B) \
1031 if (elf->elf_class == ELFCLASS ## B) { \
1032 unsigned long i; \
1033 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1034 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1035 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1036 if (EGET(phdr[i].p_type) != PT_INTERP) \
1037 continue; \
1038 *found_interp = 1; \
1039 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(phdr[i].p_offset)); \
1040 } \
287 } 1041 }
1042 SHOW_PT_INTERP(32)
1043 SHOW_PT_INTERP(64)
1044 }
1045
288 return NULL; 1046 return NULL;
289} 1047}
290static char *scanelf_file_sym(elfobj *elf, char *found_sym, const char *filename) 1048static const char *scanelf_file_bind(elfobj *elf, char *found_bind)
291{ 1049{
292 unsigned long i; 1050 unsigned long i;
1051 struct stat s;
1052 bool dynamic = false;
1053
1054 if (!show_bind) return NULL;
1055 if (!elf->phdr) return NULL;
1056
1057#define SHOW_BIND(B) \
1058 if (elf->elf_class == ELFCLASS ## B) { \
1059 Elf ## B ## _Dyn *dyn; \
1060 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1061 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1062 Elf ## B ## _Off offset; \
1063 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1064 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1065 dynamic = true; \
1066 offset = EGET(phdr[i].p_offset); \
1067 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
1068 dyn = DYN ## B (elf->vdata + offset); \
1069 while (EGET(dyn->d_tag) != DT_NULL) { \
1070 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
1071 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
1072 { \
1073 if (be_quiet) return NULL; \
1074 *found_bind = 1; \
1075 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
1076 } \
1077 ++dyn; \
1078 } \
1079 } \
1080 }
1081 SHOW_BIND(32)
1082 SHOW_BIND(64)
1083
1084 if (be_wewy_wewy_quiet) return NULL;
1085
1086 /* don't output anything if quiet mode and the ELF is static or not setuid */
1087 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
1088 return NULL;
1089 } else {
1090 *found_bind = 1;
1091 return dynamic ? "LAZY" : "STATIC";
1092 }
1093}
1094static char *scanelf_file_soname(elfobj *elf, char *found_soname)
1095{
1096 unsigned long i;
1097 char *soname;
1098 void *strtbl_void;
1099
1100 if (!show_soname) return NULL;
1101
1102 strtbl_void = elf_findsecbyname(elf, ".dynstr");
1103
1104 if (elf->phdr && strtbl_void) {
1105#define SHOW_SONAME(B) \
1106 if (elf->elf_class == ELFCLASS ## B) { \
1107 Elf ## B ## _Dyn *dyn; \
1108 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1109 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1110 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
1111 Elf ## B ## _Off offset; \
1112 /* only look for soname in shared objects */ \
1113 if (EGET(ehdr->e_type) != ET_DYN) \
1114 return NULL; \
1115 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1116 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1117 offset = EGET(phdr[i].p_offset); \
1118 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
1119 dyn = DYN ## B (elf->vdata + offset); \
1120 while (EGET(dyn->d_tag) != DT_NULL) { \
1121 if (EGET(dyn->d_tag) == DT_SONAME) { \
1122 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
1123 if (offset >= (Elf ## B ## _Off)elf->len) { \
1124 ++dyn; \
1125 continue; \
1126 } \
1127 soname = elf->data + offset; \
1128 *found_soname = 1; \
1129 return (be_wewy_wewy_quiet ? NULL : soname); \
1130 } \
1131 ++dyn; \
1132 } \
1133 } }
1134 SHOW_SONAME(32)
1135 SHOW_SONAME(64)
1136 }
1137
1138 return NULL;
1139}
1140
1141/*
1142 * We support the symbol form:
1143 * [%[modifiers]%][[+-]<symbol name>][,[.....]]
1144 * If the symbol name is empty, then all symbols are matched.
1145 * If the symbol name is a glob ("*"), then all symbols are dumped (debug).
1146 * Do not rely on this output format at all.
1147 * Otherwise the symbol name is used to search (either regex or string compare).
1148 * If the first char of the symbol name is a plus ("+"), then only match
1149 * defined symbols. If it's a minus ("-"), only match undefined symbols.
1150 * Putting modifiers in between the percent signs allows for more in depth
1151 * filters. There are groups of modifiers. If you don't specify a member
1152 * of a group, then all types in that group are matched. The current
1153 * groups and their types are:
1154 * STT group: STT_NOTYPE:n STT_OBJECT:o STT_FUNC:f STT_FILE:F
1155 * STB group: STB_LOCAL:l STB_GLOBAL:g STB_WEAK:w
1156 * SHN group: SHN_UNDEF:u SHN_ABS:a SHN_COMMON:c {defined}:d
1157 * The "defined" value in the SHN group does not correspond to a SHN_xxx define.
1158 * You can search for multiple symbols at once by seperating with a comma (",").
1159 *
1160 * Some examples:
1161 * ELFs with a weak function "foo":
1162 * scanelf -s %wf%foo <ELFs>
1163 * ELFs that define the symbol "main":
1164 * scanelf -s +main <ELFs>
1165 * scanelf -s %d%main <ELFs>
1166 * ELFs that refer to the undefined symbol "brk":
1167 * scanelf -s -brk <ELFs>
1168 * scanelf -s %u%brk <ELFs>
1169 * All global defined objects in an ELF:
1170 * scanelf -s %ogd% <ELF>
1171 */
1172static void
1173scanelf_match_symname(elfobj *elf, char *found_sym, char **ret, size_t *ret_len, const char *symname,
1174 unsigned int stt, unsigned int stb, unsigned int shn, unsigned long size)
1175{
1176 const char *this_sym;
1177 size_t n;
1178
1179 array_for_each(find_sym_arr, n, this_sym) {
1180 bool inc_notype, inc_object, inc_func, inc_file,
1181 inc_local, inc_global, inc_weak,
1182 inc_def, inc_undef, inc_abs, inc_common;
1183
1184 /* symbol selection! */
1185 inc_notype = inc_object = inc_func = inc_file = \
1186 inc_local = inc_global = inc_weak = \
1187 inc_def = inc_undef = inc_abs = inc_common = \
1188 (*this_sym != '%');
1189
1190 /* parse the contents of %...% */
1191 if (!inc_notype) {
1192 while (*(this_sym++)) {
1193 if (*this_sym == '%') {
1194 ++this_sym;
1195 break;
1196 }
1197 switch (*this_sym) {
1198 case 'n': inc_notype = true; break;
1199 case 'o': inc_object = true; break;
1200 case 'f': inc_func = true; break;
1201 case 'F': inc_file = true; break;
1202 case 'l': inc_local = true; break;
1203 case 'g': inc_global = true; break;
1204 case 'w': inc_weak = true; break;
1205 case 'd': inc_def = true; break;
1206 case 'u': inc_undef = true; break;
1207 case 'a': inc_abs = true; break;
1208 case 'c': inc_common = true; break;
1209 default: err("invalid symbol selector '%c'", *this_sym);
1210 }
1211 }
1212
1213 /* If no types are matched, not match all */
1214 if (!inc_notype && !inc_object && !inc_func && !inc_file)
1215 inc_notype = inc_object = inc_func = inc_file = true;
1216 if (!inc_local && !inc_global && !inc_weak)
1217 inc_local = inc_global = inc_weak = true;
1218 if (!inc_def && !inc_undef && !inc_abs && !inc_common)
1219 inc_def = inc_undef = inc_abs = inc_common = true;
1220
1221 /* backwards compat for defined/undefined short hand */
1222 } else if (*this_sym == '+') {
1223 inc_undef = false;
1224 ++this_sym;
1225 } else if (*this_sym == '-') {
1226 inc_def = inc_abs = inc_common = false;
1227 ++this_sym;
1228 }
1229
1230 /* filter symbols */
1231 if ((!inc_notype && stt == STT_NOTYPE) || \
1232 (!inc_object && stt == STT_OBJECT) || \
1233 (!inc_func && stt == STT_FUNC ) || \
1234 (!inc_file && stt == STT_FILE ) || \
1235 (!inc_local && stb == STB_LOCAL ) || \
1236 (!inc_global && stb == STB_GLOBAL) || \
1237 (!inc_weak && stb == STB_WEAK ) || \
1238 (!inc_def && shn && shn < SHN_LORESERVE) || \
1239 (!inc_undef && shn == SHN_UNDEF ) || \
1240 (!inc_abs && shn == SHN_ABS ) || \
1241 (!inc_common && shn == SHN_COMMON))
1242 continue;
1243
1244 if (*this_sym == '*') {
1245 /* a "*" symbol gets you debug output */
1246 printf("%s(%s) %5lX %15s %15s %15s %s\n",
1247 ((*found_sym == 0) ? "\n\t" : "\t"),
1248 elf->base_filename,
1249 size,
1250 get_elfstttype(stt),
1251 get_elfstbtype(stb),
1252 get_elfshntype(shn),
1253 symname);
1254 goto matched;
1255
1256 } else {
1257 if (g_match) {
1258 /* regex match the symbol */
1259 if (regexec(find_sym_regex_arr->eles[n], symname, 0, NULL, 0) == REG_NOMATCH)
1260 continue;
1261
1262 } else if (*this_sym) {
1263 /* give empty symbols a "pass", else do a normal compare */
1264 const size_t len = strlen(this_sym);
1265 if (!(strncmp(this_sym, symname, len) == 0 &&
1266 /* Accept unversioned symbol names */
1267 (symname[len] == '\0' || symname[len] == '@')))
1268 continue;
1269 }
1270
1271 if (be_semi_verbose) {
1272 char buf[1024];
1273 snprintf(buf, sizeof(buf), "%lX %s %s",
1274 size,
1275 get_elfstttype(stt),
1276 this_sym);
1277 *ret = xstrdup(buf);
1278 } else {
1279 if (*ret) xchrcat(ret, ',', ret_len);
1280 xstrcat(ret, symname, ret_len);
1281 }
1282
1283 goto matched;
1284 }
1285 }
1286
1287 return;
1288
1289 matched:
1290 *found_sym = 1;
1291}
1292
1293static const char *scanelf_file_sym(elfobj *elf, char *found_sym)
1294{
1295 char *ret;
293 void *symtab_void, *strtab_void; 1296 void *symtab_void, *strtab_void;
294 1297
295 if (!find_sym) return NULL; 1298 if (!find_sym) return NULL;
1299 ret = NULL;
296 1300
297 symtab_void = elf_findsecbyname(elf, ".symtab"); 1301 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
298 strtab_void = elf_findsecbyname(elf, ".strtab");
299 1302
300 if (symtab_void && strtab_void) { 1303 if (symtab_void && strtab_void) {
301#define FIND_SYM(B) \ 1304#define FIND_SYM(B) \
302 if (elf->elf_class == ELFCLASS ## B) { \ 1305 if (elf->elf_class == ELFCLASS ## B) { \
303 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 1306 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
304 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 1307 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
305 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 1308 Elf ## B ## _Sym *sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
306 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 1309 Elf ## B ## _Word i, cnt = EGET(symtab->sh_entsize); \
307 char *symname; \ 1310 char *symname; \
1311 size_t ret_len = 0; \
1312 if (cnt) \
1313 cnt = EGET(symtab->sh_size) / cnt; \
308 for (i = 0; i < cnt; ++i) { \ 1314 for (i = 0; i < cnt; ++i) { \
1315 if ((void*)sym > elf->data_end) { \
1316 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1317 goto break_out; \
1318 } \
309 if (sym->st_name) { \ 1319 if (sym->st_name) { \
1320 /* make sure the symbol name is in acceptable memory range */ \
310 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 1321 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
311 if (*find_sym == '*') { \ 1322 if ((void*)symname > elf->data_end) { \
312 printf("%s(%s) %5lX %15s %s\n", \ 1323 warnf("%s: corrupt ELF symbols", elf->filename); \
313 ((*found_sym == 0) ? "\n\t" : "\t"), \ 1324 ++sym; \
314 (char *)basename(filename), \ 1325 continue; \
315 (long)sym->st_size, \ 1326 } \
316 (char *)get_elfstttype(sym->st_info), \ 1327 scanelf_match_symname(elf, found_sym, \
317 symname); \ 1328 &ret, &ret_len, symname, \
318 *found_sym = 1; \ 1329 ELF##B##_ST_TYPE(EGET(sym->st_info)), \
319 } else if ((strcmp(find_sym, symname) == 0) || \ 1330 ELF##B##_ST_BIND(EGET(sym->st_info)), \
320 (strcmp(symname, versioned_symname) == 0)) \ 1331 EGET(sym->st_shndx), \
321 (*found_sym)++; \ 1332 /* st_size can be 64bit, but no one is really that big, so screw em */ \
1333 EGET(sym->st_size)); \
322 } \ 1334 } \
323 ++sym; \ 1335 ++sym; \
324 } } 1336 } \
1337 }
325 FIND_SYM(32) 1338 FIND_SYM(32)
326 FIND_SYM(64) 1339 FIND_SYM(64)
327 } 1340 }
1341
1342break_out:
1343 if (be_wewy_wewy_quiet) return NULL;
1344
328 if (*find_sym != '*' && *found_sym) 1345 if (*find_sym != '*' && *found_sym)
329 return find_sym; 1346 return ret;
330 if (be_quiet) 1347 if (be_quiet)
331 return NULL; 1348 return NULL;
332 else 1349 else
333 return " - "; 1350 return " - ";
334} 1351}
1352
1353static const char *scanelf_file_sections(elfobj *elf, char *found_section)
1354{
1355 if (!find_section)
1356 return NULL;
1357
1358#define FIND_SECTION(B) \
1359 if (elf->elf_class == ELFCLASS ## B) { \
1360 size_t matched, n; \
1361 int invert; \
1362 const char *section_name; \
1363 Elf ## B ## _Shdr *section; \
1364 \
1365 matched = 0; \
1366 array_for_each(find_section_arr, n, section_name) { \
1367 invert = (*section_name == '!' ? 1 : 0); \
1368 section = SHDR ## B (elf_findsecbyname(elf, section_name + invert)); \
1369 if ((section == NULL && invert) || (section != NULL && !invert)) \
1370 ++matched; \
1371 } \
1372 \
1373 if (matched == array_cnt(find_section_arr)) \
1374 *found_section = 1; \
1375 }
1376 FIND_SECTION(32)
1377 FIND_SECTION(64)
1378
1379 if (be_wewy_wewy_quiet)
1380 return NULL;
1381
1382 if (*found_section)
1383 return find_section;
1384
1385 if (be_quiet)
1386 return NULL;
1387 else
1388 return " - ";
1389}
1390
335/* scan an elf file and show all the fun stuff */ 1391/* scan an elf file and show all the fun stuff */
336#define prints(str) fputs(str, stdout) 1392#define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
337static void scanelf_file(const char *filename) 1393static int scanelf_elfobj(elfobj *elf)
338{ 1394{
339 unsigned long i; 1395 unsigned long i;
340 char found_pax, found_stack, found_relro, found_textrel, 1396 char found_pax, found_phdr, found_relro, found_load, found_textrel,
341 found_rpath, found_needed, found_interp, found_sym, 1397 found_rpath, found_needed, found_interp, found_bind, found_soname,
342 found_file; 1398 found_sym, found_lib, found_file, found_textrels, found_section;
343 elfobj *elf;
344 struct stat st;
345 static char *out_buffer = NULL; 1399 static char *out_buffer = NULL;
346 static size_t out_len; 1400 static size_t out_len;
347 1401
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 = \ 1402 found_pax = found_phdr = found_relro = found_load = found_textrel = \
360 found_rpath = found_needed = found_interp = found_sym = \ 1403 found_rpath = found_needed = found_interp = found_bind = found_soname = \
361 found_file = 0; 1404 found_sym = found_lib = found_file = found_textrels = found_section = 0;
362 1405
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) 1406 if (be_verbose > 2)
370 printf("%s: scanning file {%s,%s}\n", filename, 1407 printf("%s: scanning file {%s,%s}\n", elf->filename,
371 get_elfeitype(elf, EI_CLASS, elf->elf_class), 1408 get_elfeitype(EI_CLASS, elf->elf_class),
372 get_elfeitype(elf, EI_DATA, elf->data[EI_DATA])); 1409 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
373 else if (be_verbose) 1410 else if (be_verbose > 1)
374 printf("%s: scanning file\n", filename); 1411 printf("%s: scanning file\n", elf->filename);
375 1412
376 /* init output buffer */ 1413 /* init output buffer */
377 if (!out_buffer) { 1414 if (!out_buffer) {
378 out_len = sizeof(char) * 80; 1415 out_len = sizeof(char) * 80;
379 out_buffer = (char*)xmalloc(out_len); 1416 out_buffer = xmalloc(out_len);
380 } 1417 }
381 *out_buffer = '\0'; 1418 *out_buffer = '\0';
382 1419
383 /* show the header */ 1420 /* show the header */
384 if (!be_quiet && show_banner) { 1421 if (!be_quiet && show_banner) {
385 for (i=0; out_format[i]; ++i) { 1422 for (i = 0; out_format[i]; ++i) {
386 if (out_format[i] != '%') continue; 1423 if (!IS_MODIFIER(out_format[i])) continue;
387 1424
388 switch (out_format[++i]) { 1425 switch (out_format[++i]) {
1426 case '+': break;
389 case '%': break; 1427 case '%': break;
1428 case '#': break;
1429 case 'F':
1430 case 'p':
390 case 'F': prints("FILE "); break; 1431 case 'f': prints("FILE "); found_file = 1; break;
391 case 'o': prints(" TYPE "); break; 1432 case 'o': prints(" TYPE "); break;
392 case 'x': prints(" PAX "); break; 1433 case 'x': prints(" PAX "); break;
393 case 'e': prints("STK/REL "); break; 1434 case 'e': prints("STK/REL/PTL "); break;
394 case 't': prints("TEXTREL "); break; 1435 case 't': prints("TEXTREL "); break;
395 case 'r': prints("RPATH "); break; 1436 case 'r': prints("RPATH "); break;
1437 case 'M': prints("CLASS "); break;
1438 case 'l':
396 case 'n': prints("NEEDED "); break; 1439 case 'n': prints("NEEDED "); break;
397 case 'i': prints("INTERP "); break; 1440 case 'i': prints("INTERP "); break;
1441 case 'b': prints("BIND "); break;
1442 case 'Z': prints("SIZE "); break;
1443 case 'S': prints("SONAME "); break;
398 case 's': prints("SYM "); break; 1444 case 's': prints("SYM "); break;
1445 case 'N': prints("LIB "); break;
1446 case 'T': prints("TEXTRELS "); break;
1447 case 'k': prints("SECTION "); break;
1448 case 'a': prints("ARCH "); break;
1449 case 'I': prints("OSABI "); break;
1450 case 'Y': prints("EABI "); break;
1451 case 'O': prints("PERM "); break;
1452 case 'D': prints("ENDIAN "); break;
1453 default: warnf("'%c' has no title ?", out_format[i]);
399 } 1454 }
400 } 1455 }
1456 if (!found_file) prints("FILE ");
401 prints("\n"); 1457 prints("\n");
1458 found_file = 0;
402 show_banner = 0; 1459 show_banner = 0;
403 } 1460 }
404 1461
405 /* dump all the good stuff */ 1462 /* dump all the good stuff */
406 for (i=0; out_format[i]; ++i) { 1463 for (i = 0; out_format[i]; ++i) {
407 const char *out; 1464 const char *out;
408 1465 const char *tmp;
409 /* make sure we trim leading spaces in quiet mode */ 1466 static char ubuf[sizeof(unsigned long)*2];
410 if (be_quiet && *out_buffer == ' ' && !out_buffer[1]) 1467 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); 1468 xchrcat(&out_buffer, out_format[i], &out_len);
415 continue; 1469 continue;
416 } 1470 }
417 1471
418 out = NULL; 1472 out = NULL;
1473 be_wewy_wewy_quiet = (out_format[i] == '#');
1474 be_semi_verbose = (out_format[i] == '+');
419 switch (out_format[++i]) { 1475 switch (out_format[++i]) {
1476 case '+':
1477 case '%':
1478 case '#':
420 case '%': xchrcat(&out_buffer, '%', &out_len); break; 1479 xchrcat(&out_buffer, out_format[i], &out_len); break;
421 case 'F': found_file = 1; xstrcat(&out_buffer, filename, &out_len); break; 1480 case 'F':
1481 found_file = 1;
1482 if (be_wewy_wewy_quiet) break;
1483 xstrcat(&out_buffer, elf->filename, &out_len);
1484 break;
1485 case 'p':
1486 found_file = 1;
1487 if (be_wewy_wewy_quiet) break;
1488 tmp = elf->filename;
1489 if (search_path) {
1490 ssize_t len_search = strlen(search_path);
1491 ssize_t len_file = strlen(elf->filename);
1492 if (!strncmp(elf->filename, search_path, len_search) && \
1493 len_file > len_search)
1494 tmp += len_search;
1495 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1496 }
1497 xstrcat(&out_buffer, tmp, &out_len);
1498 break;
1499 case 'f':
1500 found_file = 1;
1501 if (be_wewy_wewy_quiet) break;
1502 tmp = strrchr(elf->filename, '/');
1503 tmp = (tmp == NULL ? elf->filename : tmp+1);
1504 xstrcat(&out_buffer, tmp, &out_len);
1505 break;
422 case 'o': out = get_elfetype(elf); break; 1506 case 'o': out = get_elfetype(elf); break;
423 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1507 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
424 case 'e': out = scanelf_file_stack(elf, &found_stack, &found_relro); break; 1508 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; 1509 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1510 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; 1511 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1512 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1513 case 'D': out = get_endian(elf); break;
1514 case 'O': out = strfileperms(elf->filename); break;
1515 case 'n':
427 case 'n': scanelf_file_needed(elf, &found_needed, &out_buffer, &out_len); break; 1516 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; 1517 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1518 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1519 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
429 case 's': out = scanelf_file_sym(elf, &found_sym, filename); break; 1520 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1521 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1522 case 'a': out = get_elfemtype(elf); break;
1523 case 'I': out = get_elfosabi(elf); break;
1524 case 'Y': out = get_elf_eabi(elf); break;
1525 case 'Z': snprintf(ubuf, sizeof(ubuf), "%lu", (unsigned long)elf->len); out = ubuf; break;;
1526 default: warnf("'%c' has no scan code?", out_format[i]);
430 } 1527 }
1528 if (out)
431 if (out) xstrcat(&out_buffer, out, &out_len); 1529 xstrcat(&out_buffer, out, &out_len);
432 } 1530 }
433 1531
434 if (!found_file) { 1532#define FOUND_SOMETHING() \
435 if (!be_quiet || found_pax || found_stack || found_textrel || \ 1533 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
436 found_rpath || found_needed || found_interp || found_sym) 1534 found_rpath || found_needed || found_interp || found_bind || \
1535 found_soname || found_sym || found_lib || found_textrels || found_section )
1536
1537 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1538 xchrcat(&out_buffer, ' ', &out_len);
437 xstrcat(&out_buffer, filename, &out_len); 1539 xstrcat(&out_buffer, elf->filename, &out_len);
438 } 1540 }
439 if (!(be_quiet && xemptybuffer(out_buffer))) 1541 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
440 puts(out_buffer); 1542 puts(out_buffer);
1543 fflush(stdout);
1544 }
441 1545
1546 return 0;
1547}
1548
1549/* scan a single elf */
1550static int scanelf_elf(const char *filename, int fd, size_t len)
1551{
1552 int ret = 1;
1553 elfobj *elf;
1554
1555 /* verify this is real ELF */
1556 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1557 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1558 return 2;
1559 }
1560 switch (match_bits) {
1561 case 32:
1562 if (elf->elf_class != ELFCLASS32)
1563 goto label_done;
1564 break;
1565 case 64:
1566 if (elf->elf_class != ELFCLASS64)
1567 goto label_done;
1568 break;
1569 default: break;
1570 }
1571 if (match_etypes) {
1572 char sbuf[126];
1573 strncpy(sbuf, match_etypes, sizeof(sbuf));
1574 if (strchr(match_etypes, ',') != NULL) {
1575 char *p;
1576 while ((p = strrchr(sbuf, ',')) != NULL) {
1577 *p = 0;
1578 if (etype_lookup(p+1) == get_etype(elf))
1579 goto label_ret;
1580 }
1581 }
1582 if (etype_lookup(sbuf) != get_etype(elf))
1583 goto label_done;
1584 }
1585
1586label_ret:
1587 ret = scanelf_elfobj(elf);
1588
1589label_done:
442 unreadelf(elf); 1590 unreadelf(elf);
1591 return ret;
1592}
1593
1594/* scan an archive of elfs */
1595static int scanelf_archive(const char *filename, int fd, size_t len)
1596{
1597 archive_handle *ar;
1598 archive_member *m;
1599 char *ar_buffer;
1600 elfobj *elf;
1601
1602 ar = ar_open_fd(filename, fd);
1603 if (ar == NULL)
1604 return 1;
1605
1606 ar_buffer = mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1607 while ((m = ar_next(ar)) != NULL) {
1608 off_t cur_pos = lseek(fd, 0, SEEK_CUR);
1609 if (cur_pos == -1)
1610 errp("lseek() failed");
1611 elf = readelf_buffer(m->name, ar_buffer + cur_pos, m->size);
1612 if (elf) {
1613 scanelf_elfobj(elf);
1614 unreadelf(elf);
1615 }
1616 }
1617 munmap(ar_buffer, len);
1618
1619 return 0;
1620}
1621/* scan a file which may be an elf or an archive or some other magical beast */
1622static int scanelf_fileat(int dir_fd, const char *filename, const struct stat *st_cache)
1623{
1624 const struct stat *st = st_cache;
1625 struct stat symlink_st;
1626 int fd;
1627
1628 /* always handle regular files and handle symlinked files if no -y */
1629 if (S_ISLNK(st->st_mode)) {
1630 if (!scan_symlink)
1631 return 1;
1632 fstatat(dir_fd, filename, &symlink_st, 0);
1633 st = &symlink_st;
1634 }
1635
1636 if (!S_ISREG(st->st_mode)) {
1637 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1638 return 1;
1639 }
1640
1641 if (match_perms) {
1642 if ((st->st_mode | match_perms) != st->st_mode)
1643 return 1;
1644 }
1645 fd = openat(dir_fd, filename, (fix_elf ? O_RDWR : O_RDONLY) | O_CLOEXEC);
1646 if (fd == -1) {
1647 if (fix_elf && errno == ETXTBSY)
1648 warnp("%s: could not fix", filename);
1649 else if (be_verbose > 2)
1650 printf("%s: skipping file: %s\n", filename, strerror(errno));
1651 return 1;
1652 }
1653
1654 if (scanelf_elf(filename, fd, st->st_size) == 2) {
1655 /* if it isn't an ELF, maybe it's an .a archive */
1656 if (scan_archives)
1657 scanelf_archive(filename, fd, st->st_size);
1658
1659 /*
1660 * unreadelf() implicitly closes its fd, so only close it
1661 * when we are returning it in the non-ELF case
1662 */
1663 close(fd);
1664 }
1665
1666 return 0;
443} 1667}
444 1668
445/* scan a directory for ET_EXEC files and print when we find one */ 1669/* scan a directory for ET_EXEC files and print when we find one */
446static void scanelf_dir(const char *path) 1670static int scanelf_dirat(int dir_fd, const char *path)
447{ 1671{
448 register DIR *dir; 1672 register DIR *dir;
449 register struct dirent *dentry; 1673 register struct dirent *dentry;
450 struct stat st_top, st; 1674 struct stat st_top, st;
451 char buf[_POSIX_PATH_MAX]; 1675 char buf[__PAX_UTILS_PATH_MAX], *subpath;
452 size_t pathlen = 0, len = 0; 1676 size_t pathlen = 0, len = 0;
1677 int ret = 0;
1678 int subdir_fd;
453 1679
454 /* make sure path exists */ 1680 /* make sure path exists */
455 if (lstat(path, &st_top) == -1) { 1681 if (fstatat(dir_fd, path, &st_top, AT_SYMLINK_NOFOLLOW) == -1) {
456 if (be_verbose > 2) printf("%s: does not exist\n", path); 1682 if (be_verbose > 2) printf("%s: does not exist\n", path);
457 return; 1683 return 1;
458 } 1684 }
459 1685
460 /* ok, if it isn't a directory, assume we can open it */ 1686 /* ok, if it isn't a directory, assume we can open it */
461 if (!S_ISDIR(st_top.st_mode)) { 1687 if (!S_ISDIR(st_top.st_mode))
462 scanelf_file(path); 1688 return scanelf_fileat(dir_fd, path, &st_top);
463 return;
464 }
465 1689
466 /* now scan the dir looking for fun stuff */ 1690 /* now scan the dir looking for fun stuff */
467 if ((dir = opendir(path)) == NULL) { 1691 subdir_fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
468 warnf("could not opendir %s: %s", path, strerror(errno)); 1692 if (subdir_fd == -1)
1693 dir = NULL;
1694 else
1695 dir = fdopendir(subdir_fd);
1696 if (dir == NULL) {
1697 if (subdir_fd != -1)
1698 close(subdir_fd);
1699 else if (be_verbose > 2)
1700 printf("%s: skipping dir: %s\n", path, strerror(errno));
469 return; 1701 return 1;
470 } 1702 }
471 if (be_verbose) printf("%s: scanning dir\n", path); 1703 if (be_verbose > 1) printf("%s: scanning dir\n", path);
472 1704
473 pathlen = strlen(path); 1705 subpath = stpcpy(buf, path);
1706 if (subpath[-1] != '/')
1707 *subpath++ = '/';
1708 pathlen = subpath - buf;
474 while ((dentry = readdir(dir))) { 1709 while ((dentry = readdir(dir))) {
475 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1710 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
476 continue; 1711 continue;
477 len = (pathlen + 1 + strlen(dentry->d_name) + 1); 1712
478 if (len >= sizeof(buf)) { 1713 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; 1714 continue;
1715
1716 len = strlen(dentry->d_name);
1717 if (len + pathlen + 1 >= sizeof(buf)) {
1718 warnf("Skipping '%s%s': len > sizeof(buf); %zu > %zu\n",
1719 path, dentry->d_name, len + pathlen + 1, sizeof(buf));
1720 continue;
481 } 1721 }
482 sprintf(buf, "%s/%s", path, dentry->d_name); 1722 memcpy(subpath, dentry->d_name, len);
483 if (lstat(buf, &st) != -1) { 1723 subpath[len] = '\0';
1724
484 if (S_ISREG(st.st_mode)) 1725 if (S_ISREG(st.st_mode))
485 scanelf_file(buf); 1726 ret = scanelf_fileat(dir_fd, buf, &st);
486 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1727 else if (dir_recurse && S_ISDIR(st.st_mode)) {
487 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1728 if (dir_crossmount || (st_top.st_dev == st.st_dev))
488 scanelf_dir(buf); 1729 ret = scanelf_dirat(dir_fd, buf);
1730 }
1731 }
1732 closedir(dir);
1733
1734 return ret;
1735}
1736static int scanelf_dir(const char *path)
1737{
1738 return scanelf_dirat(root_fd, root_rel_path(path));
1739}
1740
1741static int scanelf_from_file(const char *filename)
1742{
1743 FILE *fp;
1744 char *p, *path;
1745 size_t len;
1746 int ret;
1747
1748 if (strcmp(filename, "-") == 0)
1749 fp = stdin;
1750 else if ((fp = fopen(filename, "r")) == NULL)
1751 return 1;
1752
1753 path = NULL;
1754 len = 0;
1755 ret = 0;
1756 while (getline(&path, &len, fp) != -1) {
1757 if ((p = strchr(path, '\n')) != NULL)
1758 *p = 0;
1759 search_path = path;
1760 ret = scanelf_dir(path);
1761 }
1762 free(path);
1763
1764 if (fp != stdin)
1765 fclose(fp);
1766
1767 return ret;
1768}
1769
1770#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1771
1772static int _load_ld_cache_config(const char *fname)
1773{
1774 FILE *fp = NULL;
1775 char *p, *path;
1776 size_t len;
1777 int curr_fd = -1;
1778
1779 fp = fopenat_r(root_fd, root_rel_path(fname));
1780 if (fp == NULL)
1781 return -1;
1782
1783 path = NULL;
1784 len = 0;
1785 while (getline(&path, &len, fp) != -1) {
1786 if ((p = strrchr(path, '\r')) != NULL)
1787 *p = 0;
1788 if ((p = strchr(path, '\n')) != NULL)
1789 *p = 0;
1790
1791 /* recursive includes of the same file will make this segfault. */
1792 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1793 glob_t gl;
1794 size_t x;
1795 const char *gpath;
1796
1797 /* re-use existing path buffer ... need to be creative */
1798 if (path[8] != '/')
1799 gpath = memcpy(path + 3, "/etc/", 5);
1800 else
1801 gpath = path + 8;
1802 if (root_fd != AT_FDCWD) {
1803 if (curr_fd == -1) {
1804 curr_fd = open(".", O_RDONLY|O_CLOEXEC);
1805 if (fchdir(root_fd))
1806 errp("unable to change to root dir");
1807 }
1808 gpath = root_rel_path(gpath);
489 } 1809 }
1810
1811 if (glob(gpath, 0, NULL, &gl) == 0) {
1812 for (x = 0; x < gl.gl_pathc; ++x) {
1813 /* try to avoid direct loops */
1814 if (strcmp(gl.gl_pathv[x], fname) == 0)
1815 continue;
1816 _load_ld_cache_config(gl.gl_pathv[x]);
1817 }
1818 globfree(&gl);
490 } 1819 }
1820
1821 /* failed globs are ignored by glibc */
1822 continue;
491 } 1823 }
492 closedir(dir); 1824
1825 if (*path != '/')
1826 continue;
1827
1828 xarraypush_str(ldpaths, path);
1829 }
1830 free(path);
1831
1832 fclose(fp);
1833
1834 if (curr_fd != -1) {
1835 if (fchdir(curr_fd))
1836 {/* don't care */}
1837 close(curr_fd);
1838 }
1839
1840 return 0;
1841}
1842
1843#elif defined(__FreeBSD__) || defined(__DragonFly__)
1844
1845static int _load_ld_cache_config(const char *fname)
1846{
1847 FILE *fp = NULL;
1848 char *b = NULL, *p;
1849 struct elfhints_hdr hdr;
1850
1851 fp = fopenat_r(root_fd, root_rel_path(fname));
1852 if (fp == NULL)
1853 return -1;
1854
1855 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1856 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1857 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1858 {
1859 fclose(fp);
1860 return -1;
1861 }
1862
1863 b = xmalloc(hdr.dirlistlen + 1);
1864 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1865 fclose(fp);
1866 free(b);
1867 return -1;
1868 }
1869
1870 while ((p = strsep(&b, ":"))) {
1871 if (*p == '\0')
1872 continue;
1873 xarraypush_str(ldpaths, p);
1874 }
1875
1876 free(b);
1877 fclose(fp);
1878 return 0;
1879}
1880
1881#else
1882#ifdef __ELF__
1883#warning Cache config support not implemented for your target
1884#endif
1885static int _load_ld_cache_config(const char *fname)
1886{
1887 return 0;
1888}
1889#endif
1890
1891static void load_ld_cache_config(const char *fname)
1892{
1893 bool scan_l, scan_ul, scan_ull;
1894 size_t n;
1895 const char *ldpath;
1896
1897 _load_ld_cache_config(fname);
1898
1899 scan_l = scan_ul = scan_ull = false;
1900 if (array_cnt(ldpaths)) {
1901 array_for_each(ldpaths, n, ldpath) {
1902 if (!scan_l && !strcmp(ldpath, "/lib")) scan_l = true;
1903 if (!scan_ul && !strcmp(ldpath, "/usr/lib")) scan_ul = true;
1904 if (!scan_ull && !strcmp(ldpath, "/usr/local/lib")) scan_ull = true;
1905 }
1906 }
1907
1908 if (!scan_l) xarraypush_str(ldpaths, "/lib");
1909 if (!scan_ul) xarraypush_str(ldpaths, "/usr/lib");
1910 if (!scan_ull) xarraypush_str(ldpaths, "/usr/local/lib");
493} 1911}
494 1912
495/* scan /etc/ld.so.conf for paths */ 1913/* scan /etc/ld.so.conf for paths */
496static void scanelf_ldpath() 1914static void scanelf_ldpath(void)
497{ 1915{
498 char scan_l, scan_ul, scan_ull; 1916 size_t n;
499 char *path, *p; 1917 const char *ldpath;
500 FILE *fp;
501 1918
502 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1919 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); 1920 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} 1921}
526 1922
527/* scan env PATH for paths */ 1923/* scan env PATH for paths */
528static void scanelf_envpath() 1924static void scanelf_envpath(void)
529{ 1925{
530 char *path, *p; 1926 char *path, *p;
531 1927
532 path = getenv("PATH"); 1928 path = getenv("PATH");
533 if (!path) 1929 if (!path)
540 } 1936 }
541 1937
542 free(path); 1938 free(path);
543} 1939}
544 1940
545 1941/* 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" 1942#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZCBhV"
549#define a_argument required_argument 1943#define a_argument required_argument
550static struct option const long_opts[] = { 1944static struct option const long_opts[] = {
551 {"path", no_argument, NULL, 'p'}, 1945 {"path", no_argument, NULL, 'p'},
552 {"ldpath", no_argument, NULL, 'l'}, 1946 {"ldpath", no_argument, NULL, 'l'},
1947 {"use-ldpath",no_argument, NULL, 129},
1948 {"root", a_argument, NULL, 128},
553 {"recursive", no_argument, NULL, 'R'}, 1949 {"recursive", no_argument, NULL, 'R'},
554 {"mount", no_argument, NULL, 'm'}, 1950 {"mount", no_argument, NULL, 'm'},
555 {"symlink", no_argument, NULL, 'y'}, 1951 {"symlink", no_argument, NULL, 'y'},
1952 {"archives", no_argument, NULL, 'A'},
1953 {"ldcache", no_argument, NULL, 'L'},
1954 {"fix", no_argument, NULL, 'X'},
1955 {"setpax", a_argument, NULL, 'z'},
556 {"pax", no_argument, NULL, 'x'}, 1956 {"pax", no_argument, NULL, 'x'},
557 {"header", no_argument, NULL, 'e'}, 1957 {"header", no_argument, NULL, 'e'},
558 {"textrel", no_argument, NULL, 't'}, 1958 {"textrel", no_argument, NULL, 't'},
559 {"rpath", no_argument, NULL, 'r'}, 1959 {"rpath", no_argument, NULL, 'r'},
560 {"needed", no_argument, NULL, 'n'}, 1960 {"needed", no_argument, NULL, 'n'},
561 {"interp", no_argument, NULL, 'i'}, 1961 {"interp", no_argument, NULL, 'i'},
1962 {"bind", no_argument, NULL, 'b'},
1963 {"soname", no_argument, NULL, 'S'},
562 {"symbol", a_argument, NULL, 's'}, 1964 {"symbol", a_argument, NULL, 's'},
1965 {"section", a_argument, NULL, 'k'},
1966 {"lib", a_argument, NULL, 'N'},
1967 {"gmatch", no_argument, NULL, 'g'},
1968 {"textrels", no_argument, NULL, 'T'},
1969 {"etype", a_argument, NULL, 'E'},
1970 {"bits", a_argument, NULL, 'M'},
1971 {"endian", no_argument, NULL, 'D'},
1972 {"osabi", no_argument, NULL, 'I'},
1973 {"eabi", no_argument, NULL, 'Y'},
1974 {"perms", a_argument, NULL, 'O'},
1975 {"size", no_argument, NULL, 'Z'},
563 {"all", no_argument, NULL, 'a'}, 1976 {"all", no_argument, NULL, 'a'},
564 {"quiet", no_argument, NULL, 'q'}, 1977 {"quiet", no_argument, NULL, 'q'},
565 {"verbose", no_argument, NULL, 'v'}, 1978 {"verbose", no_argument, NULL, 'v'},
566 {"format", a_argument, NULL, 'F'}, 1979 {"format", a_argument, NULL, 'F'},
1980 {"from", a_argument, NULL, 'f'},
567 {"file", a_argument, NULL, 'o'}, 1981 {"file", a_argument, NULL, 'o'},
1982 {"nocolor", no_argument, NULL, 'C'},
568 {"nobanner", no_argument, NULL, 'B'}, 1983 {"nobanner", no_argument, NULL, 'B'},
569 {"help", no_argument, NULL, 'h'}, 1984 {"help", no_argument, NULL, 'h'},
570 {"version", no_argument, NULL, 'V'}, 1985 {"version", no_argument, NULL, 'V'},
571 {NULL, no_argument, NULL, 0x0} 1986 {NULL, no_argument, NULL, 0x0}
572}; 1987};
1988
573static char *opts_help[] = { 1989static const char * const opts_help[] = {
574 "Scan all directories in PATH environment", 1990 "Scan all directories in PATH environment",
575 "Scan all directories in /etc/ld.so.conf", 1991 "Scan all directories in /etc/ld.so.conf",
1992 "Use ld.so.conf to show full path (use with -r/-n)",
1993 "Root directory (use with -l or -p)",
576 "Scan directories recursively", 1994 "Scan directories recursively",
577 "Don't recursively cross mount points", 1995 "Don't recursively cross mount points",
578 "Don't scan symlinks\n", 1996 "Don't scan symlinks",
1997 "Scan archives (.a files)",
1998 "Utilize ld.so.cache to show full path (use with -r/-n)",
1999 "Try and 'fix' bad things (use with -r/-e)",
2000 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
579 "Print PaX markings", 2001 "Print PaX markings",
580 "Print GNU_STACK markings", 2002 "Print GNU_STACK/PT_LOAD markings",
581 "Print TEXTREL information", 2003 "Print TEXTREL information",
582 "Print RPATH information", 2004 "Print RPATH information",
583 "Print NEEDED information", 2005 "Print NEEDED information",
584 "Print INTERP information", 2006 "Print INTERP information",
2007 "Print BIND information",
2008 "Print SONAME information",
585 "Find a specified symbol", 2009 "Find a specified symbol",
586 "Print all scanned info (-x -e -t -r)\n", 2010 "Find a specified section",
2011 "Find a specified library",
2012 "Use regex rather than string compare (with -s); specify twice for case insensitive",
2013 "Locate cause of TEXTREL",
2014 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
2015 "Print only ELF files matching numeric bits",
2016 "Print Endianness",
2017 "Print OSABI",
2018 "Print EABI (EM_ARM Only)",
2019 "Print only ELF files matching octal permissions",
2020 "Print ELF file size",
2021 "Print all useful/simple info\n",
587 "Only output 'bad' things", 2022 "Only output 'bad' things",
588 "Be verbose (can be specified more than once)", 2023 "Be verbose (can be specified more than once)",
589 "Use specified format for output", 2024 "Use specified format for output",
2025 "Read input stream from a filename",
590 "Write output stream to a filename", 2026 "Write output stream to a filename",
2027 "Don't emit color in output",
591 "Don't display the header", 2028 "Don't display the header",
592 "Print this help and exit", 2029 "Print this help and exit",
593 "Print version and exit", 2030 "Print version and exit",
594 NULL 2031 NULL
595}; 2032};
596 2033
597/* display usage and exit */ 2034/* display usage and exit */
598static void usage(int status) 2035static void usage(int status)
599{ 2036{
600 unsigned long i; 2037 const char a_arg[] = "<arg>";
2038 size_t a_arg_len = strlen(a_arg) + 2;
2039 size_t i;
2040 int optlen;
601 printf(" Scan ELF binaries for stuff\n\n" 2041 printf("* Scan ELF binaries for stuff\n\n"
602 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0); 2042 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
603 printf("Options: -[%s]\n", PARSE_FLAGS); 2043 printf("Options: -[%s]\n", PARSE_FLAGS);
2044
2045 /* prescan the --long opt length to auto-align */
2046 optlen = 0;
604 for (i = 0; long_opts[i].name; ++i) 2047 for (i = 0; long_opts[i].name; ++i) {
2048 int l = strlen(long_opts[i].name);
2049 if (long_opts[i].has_arg == a_argument)
2050 l += a_arg_len;
2051 optlen = max(l, optlen);
2052 }
2053
2054 for (i = 0; long_opts[i].name; ++i) {
2055 /* first output the short flag if it has one */
2056 if (long_opts[i].val > '~')
2057 printf(" ");
2058 else
2059 printf(" -%c, ", long_opts[i].val);
2060
2061 /* then the long flag */
605 if (long_opts[i].has_arg == no_argument) 2062 if (long_opts[i].has_arg == no_argument)
606 printf(" -%c, --%-13s %s\n", long_opts[i].val, 2063 printf("--%-*s", optlen, long_opts[i].name);
607 long_opts[i].name, opts_help[i]);
608 else 2064 else
609 printf(" -%c, --%-6s <arg> %s\n", long_opts[i].val, 2065 printf("--%s %s %*s", long_opts[i].name, a_arg,
610 long_opts[i].name, opts_help[i]); 2066 (int)(optlen - strlen(long_opts[i].name) - a_arg_len), "");
2067
2068 /* finally the help text */
2069 printf("* %s\n", opts_help[i]);
2070 }
2071
2072 puts("\nFor more information, see the scanelf(1) manpage");
611 exit(status); 2073 exit(status);
612} 2074}
613 2075
614/* parse command line arguments and preform needed actions */ 2076/* parse command line arguments and preform needed actions */
2077#define do_pax_state(option, flag) \
2078 if (islower(option)) { \
2079 flags &= ~PF_##flag; \
2080 flags |= PF_NO##flag; \
2081 } else { \
2082 flags &= ~PF_NO##flag; \
2083 flags |= PF_##flag; \
2084 }
615static void parseargs(int argc, char *argv[]) 2085static int parseargs(int argc, char *argv[])
616{ 2086{
617 int flag; 2087 int i;
2088 const char *from_file = NULL;
2089 int ret = 0;
2090 char load_cache_config = 0;
618 2091
619 opterr = 0; 2092 opterr = 0;
620 while ((flag=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 2093 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
621 switch (flag) { 2094 switch (i) {
622 2095
623 case 'V': 2096 case 'V':
624 printf("%s compiled %s\n%s\n" 2097 printf("pax-utils-%s: %s compiled %s\n%s\n"
625 "%s written for Gentoo Linux by <solar and vapier @ gentoo.org>\n", 2098 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
626 __FILE__, __DATE__, rcsid, argv0); 2099 VERSION, __FILE__, __DATE__, rcsid, argv0);
627 exit(EXIT_SUCCESS); 2100 exit(EXIT_SUCCESS);
628 break; 2101 break;
629 case 'h': usage(EXIT_SUCCESS); break; 2102 case 'h': usage(EXIT_SUCCESS); break;
630 2103 case 'f':
2104 if (from_file) warn("You prob don't want to specify -f twice");
2105 from_file = optarg;
2106 break;
2107 case 'E':
2108 match_etypes = optarg;
2109 break;
2110 case 'M':
2111 match_bits = atoi(optarg);
2112 if (match_bits == 0) {
2113 if (strcmp(optarg, "ELFCLASS32") == 0)
2114 match_bits = 32;
2115 if (strcmp(optarg, "ELFCLASS64") == 0)
2116 match_bits = 64;
2117 }
2118 break;
2119 case 'O':
2120 if (sscanf(optarg, "%o", &match_perms) == -1)
2121 match_bits = 0;
2122 break;
631 case 'o': { 2123 case 'o': {
632 FILE *fp = NULL;
633 fp = freopen(optarg, "w", stdout); 2124 if (freopen(optarg, "w", stdout) == NULL)
634 if (fp == NULL) 2125 errp("Could not freopen(%s)", optarg);
635 err("Could not open output stream '%s': %s", optarg, strerror(errno));
636 stdout = fp;
637 break; 2126 break;
638 } 2127 }
639 2128 case 'k':
2129 xarraypush_str(find_section_arr, optarg);
2130 break;
640 case 's': { 2131 case 's': {
641 size_t len; 2132 /* historically, this was comma delimited */
642 find_sym = xstrdup(optarg); 2133 char *this_sym = strtok(optarg, ",");
643 len = strlen(find_sym) + 1; 2134 if (!this_sym) /* edge case: -s '' */
644 versioned_symname = (char*)xmalloc(sizeof(char) * (len+1)); 2135 xarraypush_str(find_sym_arr, "");
645 sprintf(versioned_symname, "%s@", find_sym); 2136 while (this_sym) {
2137 xarraypush_str(find_sym_arr, this_sym);
2138 this_sym = strtok(NULL, ",");
2139 }
646 break; 2140 break;
647 } 2141 }
648 2142 case 'N':
2143 xarraypush_str(find_lib_arr, optarg);
2144 break;
649 case 'F': { 2145 case 'F': {
2146 if (out_format) warn("You prob don't want to specify -F twice");
650 out_format = strdup(optarg); 2147 out_format = optarg;
651 break; 2148 break;
652 } 2149 }
2150 case 'z': {
2151 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
2152 size_t x;
653 2153
2154 for (x = 0; x < strlen(optarg); x++) {
2155 switch (optarg[x]) {
2156 case 'p':
2157 case 'P':
2158 do_pax_state(optarg[x], PAGEEXEC);
2159 break;
2160 case 's':
2161 case 'S':
2162 do_pax_state(optarg[x], SEGMEXEC);
2163 break;
2164 case 'm':
2165 case 'M':
2166 do_pax_state(optarg[x], MPROTECT);
2167 break;
2168 case 'e':
2169 case 'E':
2170 do_pax_state(optarg[x], EMUTRAMP);
2171 break;
2172 case 'r':
2173 case 'R':
2174 do_pax_state(optarg[x], RANDMMAP);
2175 break;
2176 case 'x':
2177 case 'X':
2178 do_pax_state(optarg[x], RANDEXEC);
2179 break;
2180 default:
2181 break;
2182 }
2183 }
2184 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
2185 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
2186 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
2187 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
2188 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
2189 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
2190 setpax = flags;
2191 break;
2192 }
2193 case 'Z': show_size = 1; break;
2194 case 'g': ++g_match; break;
2195 case 'L': load_cache_config = use_ldcache = 1; break;
654 case 'y': scan_symlink = 0; break; 2196 case 'y': scan_symlink = 0; break;
2197 case 'A': scan_archives = 1; break;
2198 case 'C': color_init(true); break;
655 case 'B': show_banner = 0; break; 2199 case 'B': show_banner = 0; break;
656 case 'l': scan_ldpath = 1; break; 2200 case 'l': load_cache_config = scan_ldpath = 1; break;
657 case 'p': scan_envpath = 1; break; 2201 case 'p': scan_envpath = 1; break;
658 case 'R': dir_recurse = 1; break; 2202 case 'R': dir_recurse = 1; break;
659 case 'm': dir_crossmount = 0; break; 2203 case 'm': dir_crossmount = 0; break;
2204 case 'X': ++fix_elf; break;
660 case 'x': show_pax = 1; break; 2205 case 'x': show_pax = 1; break;
661 case 'e': show_stack = 1; break; 2206 case 'e': show_phdr = 1; break;
662 case 't': show_textrel = 1; break; 2207 case 't': show_textrel = 1; break;
663 case 'r': show_rpath = 1; break; 2208 case 'r': show_rpath = 1; break;
664 case 'n': show_needed = 1; break; 2209 case 'n': show_needed = 1; break;
665 case 'i': show_interp = 1; break; 2210 case 'i': show_interp = 1; break;
666 case 'q': be_quiet = 1; break; 2211 case 'b': show_bind = 1; break;
2212 case 'S': show_soname = 1; break;
2213 case 'T': show_textrels = 1; break;
2214 case 'q': be_quiet = min(be_quiet, 20) + 1; break;
667 case 'v': be_verbose = (be_verbose % 20) + 1; break; 2215 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; 2216 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
669 2217 case 'D': show_endian = 1; break;
2218 case 'I': show_osabi = 1; break;
2219 case 'Y': show_eabi = 1; break;
2220 case 128:
2221 root_fd = open(optarg, O_RDONLY|O_CLOEXEC);
2222 if (root_fd == -1)
2223 err("Could not open root: %s", optarg);
2224 break;
2225 case 129: load_cache_config = use_ldpath = 1; break;
670 case ':': 2226 case ':':
671 warn("Option missing parameter\n"); 2227 err("Option '%c' is missing parameter", optopt);
672 usage(EXIT_FAILURE);
673 break;
674 case '?': 2228 case '?':
675 warn("Unknown option\n"); 2229 err("Unknown option '%c' or argument missing", optopt);
676 usage(EXIT_FAILURE);
677 break;
678 default: 2230 default:
679 err("Unhandled option '%c'", flag); 2231 err("Unhandled option '%c'; please report this", i);
2232 }
2233 }
2234 if (show_textrels && be_verbose)
2235 has_objdump = bin_in_path("objdump");
2236 /* precompile all the regexes */
2237 if (g_match) {
2238 regex_t preg;
2239 const char *this_sym;
2240 size_t n;
2241 int flags = REG_EXTENDED | REG_NOSUB | (g_match > 1 ? REG_ICASE : 0);
2242
2243 array_for_each(find_sym_arr, n, this_sym) {
2244 /* see scanelf_match_symname for logic info */
2245 switch (this_sym[0]) {
2246 case '%':
2247 while (*(this_sym++))
2248 if (*this_sym == '%') {
2249 ++this_sym;
2250 break;
2251 }
680 break; 2252 break;
2253 case '+':
2254 case '-':
2255 ++this_sym;
2256 break;
681 } 2257 }
2258 if (*this_sym == '*')
2259 ++this_sym;
2260
2261 ret = regcomp(&preg, this_sym, flags);
2262 if (ret) {
2263 char err[256];
2264 regerror(ret, &preg, err, sizeof(err));
2265 err("regcomp of %s failed: %s", this_sym, err);
2266 }
2267 xarraypush(find_sym_regex_arr, &preg, sizeof(preg));
682 } 2268 }
683 2269 }
684 if (be_quiet && be_verbose) 2270 /* flatten arrays for display */
685 err("You can be quiet or you can be verbose, not both, stupid"); 2271 if (array_cnt(find_sym_arr))
686 2272 find_sym = array_flatten_str(find_sym_arr);
2273 if (array_cnt(find_lib_arr))
2274 find_lib = array_flatten_str(find_lib_arr);
2275 if (array_cnt(find_section_arr))
2276 find_section = array_flatten_str(find_section_arr);
687 /* let the format option override all other options */ 2277 /* let the format option override all other options */
688 if (out_format) { 2278 if (out_format) {
689 show_pax = show_stack = show_textrel = show_rpath = show_needed = show_interp = 0; 2279 show_pax = show_phdr = show_textrel = show_rpath = \
2280 show_needed = show_interp = show_bind = show_soname = \
2281 show_textrels = show_perms = show_endian = show_size = \
2282 show_osabi = show_eabi = 0;
690 for (flag=0; out_format[flag]; ++flag) { 2283 for (i = 0; out_format[i]; ++i) {
691 if (out_format[flag] != '%') continue; 2284 if (!IS_MODIFIER(out_format[i])) continue;
692 2285
693 switch (out_format[++flag]) { 2286 switch (out_format[++i]) {
2287 case '+': break;
694 case '%': break; 2288 case '%': break;
2289 case '#': break;
695 case 'F': break; 2290 case 'F': break;
2291 case 'p': break;
2292 case 'f': break;
2293 case 'k': break;
696 case 's': break; 2294 case 's': break;
2295 case 'N': break;
697 case 'o': break; 2296 case 'o': break;
2297 case 'a': break;
2298 case 'M': break;
2299 case 'Z': show_size = 1; break;
2300 case 'D': show_endian = 1; break;
2301 case 'I': show_osabi = 1; break;
2302 case 'Y': show_eabi = 1; break;
2303 case 'O': show_perms = 1; break;
698 case 'x': show_pax = 1; break; 2304 case 'x': show_pax = 1; break;
699 case 'e': show_stack = 1; break; 2305 case 'e': show_phdr = 1; break;
700 case 't': show_textrel = 1; break; 2306 case 't': show_textrel = 1; break;
701 case 'r': show_rpath = 1; break; 2307 case 'r': show_rpath = 1; break;
702 case 'n': show_needed = 1; break; 2308 case 'n': show_needed = 1; break;
703 case 'i': show_interp = 1; break; 2309 case 'i': show_interp = 1; break;
2310 case 'b': show_bind = 1; break;
2311 case 'S': show_soname = 1; break;
2312 case 'T': show_textrels = 1; break;
704 default: 2313 default:
705 err("Invalid format specifier '%c' (byte %i)", 2314 err("invalid format specifier '%c' (byte %i)",
706 out_format[flag], flag+1); 2315 out_format[i], i+1);
707 } 2316 }
708 } 2317 }
709 2318
710 /* construct our default format */ 2319 /* construct our default format */
711 } else { 2320 } else {
712 size_t fmt_len = 30; 2321 size_t fmt_len = 30;
713 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 2322 out_format = xmalloc(sizeof(char) * fmt_len);
2323 *out_format = '\0';
714 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 2324 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
715 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len); 2325 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
2326 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
2327 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
2328 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
716 if (show_stack) xstrcat(&out_format, "%e ", &fmt_len); 2329 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
2330 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
2331 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
717 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 2332 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
718 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 2333 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
719 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 2334 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
720 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 2335 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
2336 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
2337 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
2338 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
721 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len); 2339 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
2340 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
2341 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
722 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 2342 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
723 } 2343 }
724 if (be_verbose > 2) printf("Format: %s\n", out_format); 2344 if (be_verbose > 2) printf("Format: %s\n", out_format);
725 2345
726 /* now lets actually do the scanning */ 2346 /* now lets actually do the scanning */
2347 if (load_cache_config)
2348 load_ld_cache_config(__PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
727 if (scan_ldpath) scanelf_ldpath(); 2349 if (scan_ldpath) scanelf_ldpath();
728 if (scan_envpath) scanelf_envpath(); 2350 if (scan_envpath) scanelf_envpath();
2351 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
2352 from_file = "-";
2353 if (from_file) {
2354 scanelf_from_file(from_file);
2355 from_file = *argv;
2356 }
729 if (optind == argc && !scan_ldpath && !scan_envpath) 2357 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
730 err("Nothing to scan !?"); 2358 err("Nothing to scan !?");
731 while (optind < argc) 2359 while (optind < argc) {
732 scanelf_dir(argv[optind++]); 2360 search_path = argv[optind++];
2361 ret = scanelf_dir(search_path);
2362 }
733 2363
2364#ifdef __PAX_UTILS_CLEANUP
734 /* clean up */ 2365 /* clean up */
735 if (find_sym) { 2366 xarrayfree(ldpaths);
2367 xarrayfree(find_sym_arr);
2368 xarrayfree(find_lib_arr);
2369 xarrayfree(find_section_arr);
736 free(find_sym); 2370 free(find_sym);
737 free(versioned_symname); 2371 free(find_lib);
2372 free(find_section);
2373 {
2374 size_t n;
2375 regex_t *preg;
2376 array_for_each(find_sym_regex_arr, n, preg)
2377 regfree(preg);
2378 xarrayfree(find_sym_regex_arr);
738 } 2379 }
739 if (out_format) free(out_format);
740}
741 2380
2381 if (ldcache != 0)
2382 munmap(ldcache, ldcache_size);
2383#endif
742 2384
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; 2385 return ret;
750} 2386}
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 2387
761 new_len = strlen(*dst) + strlen(src); 2388static 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{ 2389{
773 static char my_app[2]; 2390 const char *delims = " \t\n";
774 my_app[0] = append; 2391 char **envvals = NULL;
775 my_app[1] = '\0'; 2392 char *env, *s;
776 xstrcat(dst, my_app, curr_len); 2393 int nentry;
777} 2394
778static int xemptybuffer(const char *buff) 2395 if ((env = getenv(envvar)) == NULL)
779{
780 long i;
781 for (i=0; buff[i]; ++i)
782 if (buff[i] != ' ')
783 return 0; 2396 return NULL;
2397
2398 env = xstrdup(env);
2399 if (env == NULL)
784 return 1; 2400 return NULL;
785}
786 2401
2402 s = strtok(env, delims);
2403 if (s == NULL) {
2404 free(env);
2405 return NULL;
2406 }
787 2407
2408 nentry = 0;
2409 while (s != NULL) {
2410 ++nentry;
2411 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
2412 envvals[nentry-1] = s;
2413 s = strtok(NULL, delims);
2414 }
2415 envvals[nentry] = NULL;
2416
2417 /* don't want to free(env) as it contains the memory that backs
2418 * the envvals array of strings */
2419 return envvals;
2420}
2421
2422static void parseenv(void)
2423{
2424 color_init(false);
2425 qa_textrels = get_split_env("QA_TEXTRELS");
2426 qa_execstack = get_split_env("QA_EXECSTACK");
2427 qa_wx_load = get_split_env("QA_WX_LOAD");
2428}
2429
2430#ifdef __PAX_UTILS_CLEANUP
2431static void cleanup(void)
2432{
2433 free(out_format);
2434 free(qa_textrels);
2435 free(qa_execstack);
2436 free(qa_wx_load);
2437}
2438#endif
788 2439
789int main(int argc, char *argv[]) 2440int main(int argc, char *argv[])
790{ 2441{
2442 int ret;
791 if (argc < 2) 2443 if (argc < 2)
792 usage(EXIT_FAILURE); 2444 usage(EXIT_FAILURE);
2445 parseenv();
793 parseargs(argc, argv); 2446 ret = parseargs(argc, argv);
794 fclose(stdout); 2447 fclose(stdout);
795 return EXIT_SUCCESS; 2448#ifdef __PAX_UTILS_CLEANUP
2449 cleanup();
2450 warn("The calls to add/delete heap should be off:\n"
2451 "\t- 1 due to the out_buffer not being freed in scanelf_fileat()\n"
2452 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
2453#endif
2454 return ret;
796} 2455}
2456
2457/* Match filename against entries in matchlist, return TRUE
2458 * if the file is listed */
2459static int file_matches_list(const char *filename, char **matchlist)
2460{
2461 char **file;
2462 char *match;
2463 char buf[__PAX_UTILS_PATH_MAX];
2464
2465 if (matchlist == NULL)
2466 return 0;
2467
2468 for (file = matchlist; *file != NULL; file++) {
2469 if (search_path) {
2470 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2471 match = buf;
2472 } else {
2473 match = *file;
2474 }
2475 if (fnmatch(match, filename, 0) == 0)
2476 return 1;
2477 }
2478 return 0;
2479}

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