/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.12 Revision 1.239
1/* 1/*
2 * Copyright 2003 Ned Ludd <solar@gentoo.org>
3 * Copyright 1999-2005 Gentoo Foundation 2 * Copyright 2003-2007 Gentoo Foundation
4 * Distributed under the terms of the GNU General Public License v2 3 * Distributed under the terms of the GNU General Public License v2
5 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.12 2005/03/31 00:50:56 solar Exp $ 4 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.239 2012/01/23 22:28:17 vapier Exp $
6 * 5 *
7 ******************************************************************** 6 * Copyright 2003-2007 Ned Ludd - <solar@gentoo.org>
8 * This program is free software; you can redistribute it and/or 7 * Copyright 2004-2007 Mike Frysinger - <vapier@gentoo.org>
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of the
11 * License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
21 * MA 02111-1307, USA.
22 */ 8 */
23 9
24#include <stdio.h> 10static const char rcsid[] = "$Id: scanelf.c,v 1.239 2012/01/23 22:28:17 vapier Exp $";
25#include <stdlib.h> 11const char argv0[] = "scanelf";
26#include <sys/types.h>
27#include <string.h>
28#include <errno.h>
29#include <unistd.h>
30#include <sys/stat.h>
31#include <dirent.h>
32#include <getopt.h>
33 12
34#include "paxelf.h" 13#include "paxinc.h"
35 14
36static const char *rcsid = "$Id: scanelf.c,v 1.12 2005/03/31 00:50:56 solar Exp $"; 15#define IS_MODIFIER(c) (c == '%' || c == '#' || c == '+')
37
38
39/* helper functions for showing errors */
40#define argv0 "scanelf\0" /*((*argv != NULL) ? argv[0] : __FILE__ "\b\b")*/
41#define warn(fmt, args...) \
42 fprintf(stderr, "%s: " fmt "\n", argv0, ## args)
43#define warnf(fmt, args...) warn("%s(): " fmt, __FUNCTION__, ## args)
44#define err(fmt, args...) \
45 do { \
46 warn(fmt, ## args); \
47 exit(EXIT_FAILURE); \
48 } while (0)
49
50
51 16
52/* prototypes */ 17/* prototypes */
53static void scanelf_file(const char *filename); 18static int file_matches_list(const char *filename, char **matchlist);
54static void scanelf_dir(const char *path);
55static void scanelf_ldpath();
56static void scanelf_envpath();
57static void usage(int status);
58static void parseargs(int argc, char *argv[]);
59 19
60/* variables to control behavior */ 20/* variables to control behavior */
21static char *match_etypes = NULL;
22static array_t _ldpaths = array_init_decl, *ldpaths = &_ldpaths;
61static char scan_ldpath = 0; 23static char scan_ldpath = 0;
62static char scan_envpath = 0; 24static char scan_envpath = 0;
25static char scan_symlink = 1;
26static char scan_archives = 0;
63static char dir_recurse = 0; 27static char dir_recurse = 0;
28static char dir_crossmount = 1;
64static char show_pax = 0; 29static char show_pax = 0;
30static char show_perms = 0;
65static char show_stack = 0; 31static char show_size = 0;
32static char show_phdr = 0;
66static char show_textrel = 0; 33static char show_textrel = 0;
67static char show_rpath = 0; 34static char show_rpath = 0;
35static char show_needed = 0;
36static char show_interp = 0;
37static char show_bind = 0;
38static char show_soname = 0;
39static char show_textrels = 0;
68static char show_header = 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;
45static char be_verbose = 0;
46static char be_wewy_wewy_quiet = 0;
47static char be_semi_verbose = 0;
48static char *find_sym = NULL;
49static char *find_lib = NULL;
50static array_t _find_lib_arr = array_init_decl, *find_lib_arr = &_find_lib_arr;
51static char *find_section = NULL;
52static array_t _find_section_arr = array_init_decl, *find_section_arr = &_find_section_arr;
53static char *out_format = NULL;
54static char *search_path = NULL;
55static char fix_elf = 0;
56static char g_match = 0;
57static char use_ldcache = 0;
70 58
59static char **qa_textrels = NULL;
60static char **qa_execstack = NULL;
61static char **qa_wx_load = NULL;
62static int root_fd = AT_FDCWD;
71 63
64static int match_bits = 0;
65static unsigned int match_perms = 0;
66static void *ldcache = NULL;
67static size_t ldcache_size = 0;
68static unsigned long setpax = 0UL;
69
70static int has_objdump = 0;
71
72/* find the path to a file by name */
73static int bin_in_path(const char *fname)
74{
75 char fullpath[__PAX_UTILS_PATH_MAX];
76 char *path, *p;
77
78 path = getenv("PATH");
79 if (!path)
80 return 0;
81
82 while ((p = strrchr(path, ':')) != NULL) {
83 snprintf(fullpath, sizeof(fullpath), "%s/%s", p + 1, fname);
84 *p = 0;
85 if (access(fullpath, R_OK) != -1)
86 return 1;
87 }
88
89 return 0;
90}
91
92static FILE *fopenat_r(int dir_fd, const char *path)
93{
94 int fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
95 if (fd == -1)
96 return NULL;
97 return fdopen(fd, "re");
98}
99
100static const char *root_rel_path(const char *path)
101{
102 /*
103 * openat() will ignore the dirfd if path starts with
104 * a /, so consume all of that noise
105 *
106 * XXX: we don't handle relative paths like ../ that
107 * break out of the --root option, but for now, just
108 * don't do that :P.
109 */
110 if (root_fd != AT_FDCWD) {
111 while (*path == '/')
112 ++path;
113 if (*path == '\0')
114 path = ".";
115 }
116
117 return path;
118}
119
120/* 1 on failure. 0 otherwise */
121static int rematch(const char *regex, const char *match, int cflags)
122{
123 regex_t preg;
124 int ret;
125
126 if ((match == NULL) || (regex == NULL))
127 return EXIT_FAILURE;
128
129 if ((ret = regcomp(&preg, regex, cflags))) {
130 char err[256];
131
132 if (regerror(ret, &preg, err, sizeof(err)))
133 fprintf(stderr, "regcomp failed: %s", err);
134 else
135 fprintf(stderr, "regcomp failed");
136
137 return EXIT_FAILURE;
138 }
139 ret = regexec(&preg, match, 0, NULL, 0);
140 regfree(&preg);
141
142 return ret;
143}
144
145/* sub-funcs for scanelf_fileat() */
146static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **str)
147{
148 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
149
150 /* debug sections */
151 void *symtab = elf_findsecbyname(elf, ".symtab");
152 void *strtab = elf_findsecbyname(elf, ".strtab");
153 /* runtime sections */
154 void *dynsym = elf_findsecbyname(elf, ".dynsym");
155 void *dynstr = elf_findsecbyname(elf, ".dynstr");
156
157#define GET_SYMTABS(B) \
158 if (elf->elf_class == ELFCLASS ## B) { \
159 if (symtab && dynsym) { \
160 Elf ## B ## _Shdr *esymtab = symtab; \
161 Elf ## B ## _Shdr *edynsym = dynsym; \
162 *sym = (EGET(esymtab->sh_size) > EGET(edynsym->sh_size)) ? symtab : dynsym; \
163 } else \
164 *sym = symtab ? symtab : dynsym; \
165 if (strtab && dynstr) { \
166 Elf ## B ## _Shdr *estrtab = strtab; \
167 Elf ## B ## _Shdr *edynstr = dynstr; \
168 *str = (EGET(estrtab->sh_size) > EGET(edynstr->sh_size)) ? strtab : dynstr; \
169 } else \
170 *str = strtab ? strtab : dynstr; \
171 }
172 GET_SYMTABS(32)
173 GET_SYMTABS(64)
174
175 if (*sym && *str)
176 return;
177
178 /*
179 * damn, they're really going to make us work for it huh?
180 * reconstruct the section header info out of the dynamic
181 * tags so we can see what symbols this guy uses at runtime.
182 */
183#define GET_SYMTABS_DT(B) \
184 if (elf->elf_class == ELFCLASS ## B) { \
185 size_t i; \
186 static Elf ## B ## _Shdr sym_shdr, str_shdr; \
187 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
188 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
189 Elf ## B ## _Addr vsym, vstr, vhash, vgnu_hash; \
190 Elf ## B ## _Dyn *dyn; \
191 Elf ## B ## _Off offset; \
192 \
193 /* lookup symbols used at runtime with DT_SYMTAB / DT_STRTAB */ \
194 vsym = vstr = vhash = vgnu_hash = 0; \
195 memset(&sym_shdr, 0, sizeof(sym_shdr)); \
196 memset(&str_shdr, 0, sizeof(str_shdr)); \
197 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
198 if (EGET(phdr[i].p_type) != PT_DYNAMIC) \
199 continue; \
200 \
201 offset = EGET(phdr[i].p_offset); \
202 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
203 continue; \
204 \
205 dyn = DYN ## B (elf->vdata + offset); \
206 while (EGET(dyn->d_tag) != DT_NULL) { \
207 switch (EGET(dyn->d_tag)) { \
208 case DT_SYMTAB: vsym = EGET(dyn->d_un.d_val); break; \
209 case DT_SYMENT: sym_shdr.sh_entsize = dyn->d_un.d_val; break; \
210 case DT_STRTAB: vstr = EGET(dyn->d_un.d_val); break; \
211 case DT_STRSZ: str_shdr.sh_size = dyn->d_un.d_val; break; \
212 case DT_HASH: vhash = EGET(dyn->d_un.d_val); break; \
213 /*case DT_GNU_HASH: vgnu_hash = EGET(dyn->d_un.d_val); break;*/ \
214 } \
215 ++dyn; \
216 } \
217 if (vsym && vstr) \
218 break; \
219 } \
220 if (!vsym || !vstr || !(vhash || vgnu_hash)) \
221 return; \
222 \
223 /* calc offset into the ELF by finding the load addr of the syms */ \
224 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
225 Elf ## B ## _Addr vaddr = EGET(phdr[i].p_vaddr); \
226 Elf ## B ## _Addr filesz = EGET(phdr[i].p_filesz); \
227 offset = EGET(phdr[i].p_offset); \
228 \
229 if (EGET(phdr[i].p_type) != PT_LOAD) \
230 continue; \
231 \
232 if (vhash >= vaddr && vhash < vaddr + filesz) { \
233 /* Scan the hash table to see how many entries we have */ \
234 Elf32_Word max_sym_idx = 0; \
235 Elf32_Word *hashtbl = elf->vdata + offset + (vhash - vaddr); \
236 Elf32_Word b, nbuckets = EGET(hashtbl[0]); \
237 Elf32_Word nchains = EGET(hashtbl[1]); \
238 Elf32_Word *buckets = &hashtbl[2]; \
239 Elf32_Word *chains = &buckets[nbuckets]; \
240 Elf32_Word sym_idx; \
241 \
242 for (b = 0; b < nbuckets; ++b) { \
243 if (!buckets[b]) \
244 continue; \
245 for (sym_idx = buckets[b]; sym_idx < nchains && sym_idx; sym_idx = chains[sym_idx]) \
246 if (max_sym_idx < sym_idx) \
247 max_sym_idx = sym_idx; \
248 } \
249 ESET(sym_shdr.sh_size, sym_shdr.sh_entsize * max_sym_idx); \
250 } \
251 \
252 if (vsym >= vaddr && vsym < vaddr + filesz) { \
253 ESET(sym_shdr.sh_offset, offset + (vsym - vaddr)); \
254 *sym = &sym_shdr; \
255 } \
256 \
257 if (vstr >= vaddr && vstr < vaddr + filesz) { \
258 ESET(str_shdr.sh_offset, offset + (vstr - vaddr)); \
259 *str = &str_shdr; \
260 } \
261 } \
262 }
263 GET_SYMTABS_DT(32)
264 GET_SYMTABS_DT(64)
265}
266
267static char *scanelf_file_pax(elfobj *elf, char *found_pax)
268{
269 static char ret[7];
270 unsigned long i, shown;
271
272 if (!show_pax) return NULL;
273
274 shown = 0;
275 memset(&ret, 0, sizeof(ret));
276
277 if (elf->phdr) {
278#define SHOW_PAX(B) \
279 if (elf->elf_class == ELFCLASS ## B) { \
280 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
281 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
282 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
283 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
284 continue; \
285 if (fix_elf && setpax) { \
286 /* set the paxctl flags */ \
287 ESET(phdr[i].p_flags, setpax); \
288 } \
289 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
290 continue; \
291 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
292 *found_pax = 1; \
293 ++shown; \
294 break; \
295 } \
296 }
297 SHOW_PAX(32)
298 SHOW_PAX(64)
299 }
300
301 if (fix_elf && setpax) {
302 /* set the chpax settings */
303 if (elf->elf_class == ELFCLASS32) {
304 if (EHDR32(elf->ehdr)->e_type == ET_DYN || EHDR32(elf->ehdr)->e_type == ET_EXEC)
305 ESET(EHDR32(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
306 } else {
307 if (EHDR64(elf->ehdr)->e_type == ET_DYN || EHDR64(elf->ehdr)->e_type == ET_EXEC)
308 ESET(EHDR64(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
309 }
310 }
311
312 /* fall back to EI_PAX if no PT_PAX was found */
313 if (!*ret) {
314 static char *paxflags;
315 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
316 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
317 *found_pax = 1;
318 return (be_wewy_wewy_quiet ? NULL : paxflags);
319 }
320 strncpy(ret, paxflags, sizeof(ret));
321 }
322
323 if (be_wewy_wewy_quiet || (be_quiet && !shown))
324 return NULL;
325 else
326 return ret;
327}
328
329static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
330{
331 static char ret[12];
332 char *found;
333 unsigned long i, shown, multi_stack, multi_relro, multi_load;
334 int max_pt_load;
335
336 if (!show_phdr) return NULL;
337
338 memcpy(ret, "--- --- ---\0", 12);
339
340 shown = 0;
341 multi_stack = multi_relro = multi_load = 0;
342 max_pt_load = elf_max_pt_load(elf);
343
344#define NOTE_GNU_STACK ".note.GNU-stack"
345#define SHOW_PHDR(B) \
346 if (elf->elf_class == ELFCLASS ## B) { \
347 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
348 Elf ## B ## _Off offset; \
349 uint32_t flags, check_flags; \
350 if (elf->phdr != NULL) { \
351 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
352 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
353 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
354 if (multi_stack++) \
355 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
356 if (file_matches_list(elf->filename, qa_execstack)) \
357 continue; \
358 found = found_phdr; \
359 offset = 0; \
360 check_flags = PF_X; \
361 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
362 if (multi_relro++) \
363 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
364 found = found_relro; \
365 offset = 4; \
366 check_flags = PF_X; \
367 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
368 if (EGET(ehdr->e_type) == ET_DYN || EGET(ehdr->e_type) == ET_EXEC) \
369 if (multi_load++ > max_pt_load) \
370 warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
371 if (file_matches_list(elf->filename, qa_wx_load)) \
372 continue; \
373 found = found_load; \
374 offset = 8; \
375 check_flags = PF_W|PF_X; \
376 } else \
377 continue; \
378 flags = EGET(phdr[i].p_flags); \
379 if (be_quiet && ((flags & check_flags) != check_flags)) \
380 continue; \
381 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
382 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
383 ret[3] = ret[7] = '!'; \
384 flags = EGET(phdr[i].p_flags); \
385 } \
386 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
387 *found = 1; \
388 ++shown; \
389 } \
390 } else if (elf->shdr != NULL) { \
391 /* no program headers which means this is prob an object file */ \
392 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
393 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
394 char *str; \
395 if ((void*)strtbl > elf->data_end) \
396 goto skip_this_shdr##B; \
397 check_flags = SHF_WRITE|SHF_EXECINSTR; \
398 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
399 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
400 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
401 str = elf->data + offset; \
402 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
403 if (!strcmp(str, NOTE_GNU_STACK)) { \
404 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
405 flags = EGET(shdr[i].sh_flags); \
406 if (be_quiet && ((flags & check_flags) != check_flags)) \
407 continue; \
408 ++*found_phdr; \
409 shown = 1; \
410 if (flags & SHF_WRITE) ret[0] = 'W'; \
411 if (flags & SHF_ALLOC) ret[1] = 'A'; \
412 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
413 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
414 break; \
415 } \
416 } \
417 skip_this_shdr##B: \
418 if (!multi_stack) { \
419 if (file_matches_list(elf->filename, qa_execstack)) \
420 return NULL; \
421 *found_phdr = 1; \
422 shown = 1; \
423 memcpy(ret, "!WX", 3); \
424 } \
425 } \
426 }
427 SHOW_PHDR(32)
428 SHOW_PHDR(64)
429
430 if (be_wewy_wewy_quiet || (be_quiet && !shown))
431 return NULL;
432 else
433 return ret;
434}
435
436/*
437 * See if this ELF contains a DT_TEXTREL tag in any of its
438 * PT_DYNAMIC sections.
439 */
440static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
441{
442 static const char *ret = "TEXTREL";
443 unsigned long i;
444
445 if (!show_textrel && !show_textrels) return NULL;
446
447 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
448
449 if (elf->phdr) {
450#define SHOW_TEXTREL(B) \
451 if (elf->elf_class == ELFCLASS ## B) { \
452 Elf ## B ## _Dyn *dyn; \
453 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
454 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
455 Elf ## B ## _Off offset; \
456 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
457 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
458 offset = EGET(phdr[i].p_offset); \
459 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
460 dyn = DYN ## B (elf->vdata + offset); \
461 while (EGET(dyn->d_tag) != DT_NULL) { \
462 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
463 *found_textrel = 1; \
464 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
465 return (be_wewy_wewy_quiet ? NULL : ret); \
466 } \
467 ++dyn; \
468 } \
469 } }
470 SHOW_TEXTREL(32)
471 SHOW_TEXTREL(64)
472 }
473
474 if (be_quiet || be_wewy_wewy_quiet)
475 return NULL;
476 else
477 return " - ";
478}
479
480/*
481 * Scan the .text section to see if there are any relocations in it.
482 * Should rewrite this to check PT_LOAD sections that are marked
483 * Executable rather than the section named '.text'.
484 */
485static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
486{
487 unsigned long s, r, rmax;
488 void *symtab_void, *strtab_void, *text_void;
489
490 if (!show_textrels) return NULL;
491
492 /* don't search for TEXTREL's if the ELF doesn't have any */
493 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
494 if (!*found_textrel) return NULL;
495
496 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
497 text_void = elf_findsecbyname(elf, ".text");
498
499 if (symtab_void && strtab_void && text_void && elf->shdr) {
500#define SHOW_TEXTRELS(B) \
501 if (elf->elf_class == ELFCLASS ## B) { \
502 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
503 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
504 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
505 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
506 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
507 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
508 uint ## B ## _t memsz = EGET(text->sh_size); \
509 Elf ## B ## _Rel *rel; \
510 Elf ## B ## _Rela *rela; \
511 /* search the section headers for relocations */ \
512 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
513 uint32_t sh_type = EGET(shdr[s].sh_type); \
514 if (sh_type == SHT_REL) { \
515 rel = REL ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
516 rela = NULL; \
517 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
518 } else if (sh_type == SHT_RELA) { \
519 rel = NULL; \
520 rela = RELA ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
521 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
522 } else \
523 continue; \
524 /* now see if any of the relocs are in the .text */ \
525 for (r = 0; r < rmax; ++r) { \
526 unsigned long sym_max; \
527 Elf ## B ## _Addr offset_tmp; \
528 Elf ## B ## _Sym *func; \
529 Elf ## B ## _Sym *sym; \
530 Elf ## B ## _Addr r_offset; \
531 uint ## B ## _t r_info; \
532 if (sh_type == SHT_REL) { \
533 r_offset = EGET(rel[r].r_offset); \
534 r_info = EGET(rel[r].r_info); \
535 } else { \
536 r_offset = EGET(rela[r].r_offset); \
537 r_info = EGET(rela[r].r_info); \
538 } \
539 /* make sure this relocation is inside of the .text */ \
540 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
541 if (be_verbose <= 2) continue; \
542 } else \
543 *found_textrels = 1; \
544 /* locate this relocation symbol name */ \
545 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
546 if ((void*)sym > elf->data_end) { \
547 warn("%s: corrupt ELF symbol", elf->filename); \
548 continue; \
549 } \
550 sym_max = ELF ## B ## _R_SYM(r_info); \
551 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
552 sym += sym_max; \
553 else \
554 sym = NULL; \
555 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
556 /* show the raw details about this reloc */ \
557 printf(" %s: ", elf->base_filename); \
558 if (sym && sym->st_name) \
559 printf("%s", elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
560 else \
561 printf("(memory/data?)"); \
562 printf(" [0x%lX]", (unsigned long)r_offset); \
563 /* now try to find the closest symbol that this rel is probably in */ \
564 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
565 func = NULL; \
566 offset_tmp = 0; \
567 while (sym_max--) { \
568 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
569 func = sym; \
570 offset_tmp = EGET(sym->st_value); \
571 } \
572 ++sym; \
573 } \
574 printf(" in "); \
575 if (func && func->st_name) { \
576 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
577 if (r_offset > EGET(func->st_size)) \
578 printf("(optimized out: previous %s)", func_name); \
579 else \
580 printf("%s", func_name); \
581 } else \
582 printf("(optimized out)"); \
583 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
584 if (be_verbose && has_objdump) { \
585 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
586 char *sysbuf; \
587 size_t syslen; \
588 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"; \
589 syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
590 sysbuf = xmalloc(syslen); \
591 if (end_addr < r_offset) \
592 /* not uncommon when things are optimized out */ \
593 end_addr = r_offset + 0x100; \
594 snprintf(sysbuf, syslen, sysfmt, \
595 (unsigned long)offset_tmp, \
596 (unsigned long)end_addr, \
597 elf->filename, \
598 (unsigned long)r_offset); \
599 fflush(stdout); \
600 if (system(sysbuf)) /* don't care */; \
601 fflush(stdout); \
602 free(sysbuf); \
603 } \
604 } \
605 } }
606 SHOW_TEXTRELS(32)
607 SHOW_TEXTRELS(64)
608 }
609 if (!*found_textrels)
610 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
611
612 return NULL;
613}
614
615static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
616{
617 struct stat st;
618 switch (*item) {
619 case '/': break;
620 case '.':
621 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
622 break;
623 case ':':
624 case '\0':
625 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
626 break;
627 case '$':
628 if (fstat(elf->fd, &st) != -1)
629 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
630 warnf("Security problem with %s='%s' in %s with mode set of %o",
631 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
632 break;
633 default:
634 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
635 break;
636 }
637}
638static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
639{
640 unsigned long i;
641 char *rpath, *runpath, **r;
642 void *strtbl_void;
643
644 if (!show_rpath) return;
645
646 strtbl_void = elf_findsecbyname(elf, ".dynstr");
647 rpath = runpath = NULL;
648
649 if (elf->phdr && strtbl_void) {
650#define SHOW_RPATH(B) \
651 if (elf->elf_class == ELFCLASS ## B) { \
652 Elf ## B ## _Dyn *dyn; \
653 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
654 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
655 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
656 Elf ## B ## _Off offset; \
657 Elf ## B ## _Xword word; \
658 /* Scan all the program headers */ \
659 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
660 /* Just scan dynamic headers */ \
661 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
662 offset = EGET(phdr[i].p_offset); \
663 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
664 /* Just scan dynamic RPATH/RUNPATH headers */ \
665 dyn = DYN ## B (elf->vdata + offset); \
666 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
667 if (word == DT_RPATH) { \
668 r = &rpath; \
669 } else if (word == DT_RUNPATH) { \
670 r = &runpath; \
671 } else { \
672 ++dyn; \
673 continue; \
674 } \
675 /* Verify the memory is somewhat sane */ \
676 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
677 if (offset < (Elf ## B ## _Off)elf->len) { \
678 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
679 *r = elf->data + offset; \
680 /* cache the length in case we need to nuke this section later on */ \
681 if (fix_elf) \
682 offset = strlen(*r); \
683 /* If quiet, don't output paths in ld.so.conf */ \
684 if (be_quiet) { \
685 size_t len; \
686 char *start, *end; \
687 /* note that we only 'chop' off leading known paths. */ \
688 /* since *r is read-only memory, we can only move the ptr forward. */ \
689 start = *r; \
690 /* scan each path in : delimited list */ \
691 while (start) { \
692 rpath_security_checks(elf, start, get_elfdtype(word)); \
693 end = strchr(start, ':'); \
694 len = (end ? abs(end - start) : strlen(start)); \
695 if (use_ldcache) { \
696 size_t n; \
697 const char *ldpath; \
698 array_for_each(ldpaths, n, ldpath) \
699 if (!strncmp(ldpath, start, len) && !ldpath[len]) { \
700 *r = end; \
701 /* corner case ... if RPATH reads "/usr/lib:", we want \
702 * to show ':' rather than '' */ \
703 if (end && end[1] != '\0') \
704 (*r)++; \
705 break; \
706 } \
707 } \
708 if (!*r || !end) \
709 break; \
710 else \
711 start = start + len + 1; \
712 } \
713 } \
714 if (*r) { \
715 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
716 /* just nuke it */ \
717 nuke_it##B: \
718 memset(*r, 0x00, offset); \
719 *r = NULL; \
720 ESET(dyn->d_tag, DT_DEBUG); \
721 ESET(dyn->d_un.d_ptr, 0); \
722 } else if (fix_elf) { \
723 /* try to clean "bad" paths */ \
724 size_t len, tmpdir_len; \
725 char *start, *end; \
726 const char *tmpdir; \
727 start = *r; \
728 tmpdir = (getenv("TMPDIR") ? : "."); \
729 tmpdir_len = strlen(tmpdir); \
730 while (1) { \
731 end = strchr(start, ':'); \
732 if (start == end) { \
733 eat_this_path##B: \
734 len = strlen(end); \
735 memmove(start, end+1, len); \
736 start[len-1] = '\0'; \
737 end = start - 1; \
738 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
739 if (!end) { \
740 if (start == *r) \
741 goto nuke_it##B; \
742 *--start = '\0'; \
743 } else \
744 goto eat_this_path##B; \
745 } \
746 if (!end) \
747 break; \
748 start = end + 1; \
749 } \
750 if (**r == '\0') \
751 goto nuke_it##B; \
752 } \
753 if (*r) \
754 *found_rpath = 1; \
755 } \
756 } \
757 ++dyn; \
758 } \
759 } }
760 SHOW_RPATH(32)
761 SHOW_RPATH(64)
762 }
763
764 if (be_wewy_wewy_quiet) return;
765
766 if (rpath && runpath) {
767 if (!strcmp(rpath, runpath)) {
768 xstrcat(ret, runpath, ret_len);
769 } else {
770 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
771 xchrcat(ret, '{', ret_len);
772 xstrcat(ret, rpath, ret_len);
773 xchrcat(ret, ',', ret_len);
774 xstrcat(ret, runpath, ret_len);
775 xchrcat(ret, '}', ret_len);
776 }
777 } else if (rpath || runpath)
778 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
779 else if (!be_quiet)
780 xstrcat(ret, " - ", ret_len);
781}
782
783#define LDSO_CACHE_MAGIC "ld.so-"
784#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
785#define LDSO_CACHE_VER "1.7.0"
786#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
787#define FLAG_ANY -1
788#define FLAG_TYPE_MASK 0x00ff
789#define FLAG_LIBC4 0x0000
790#define FLAG_ELF 0x0001
791#define FLAG_ELF_LIBC5 0x0002
792#define FLAG_ELF_LIBC6 0x0003
793#define FLAG_REQUIRED_MASK 0xff00
794#define FLAG_SPARC_LIB64 0x0100
795#define FLAG_IA64_LIB64 0x0200
796#define FLAG_X8664_LIB64 0x0300
797#define FLAG_S390_LIB64 0x0400
798#define FLAG_POWERPC_LIB64 0x0500
799#define FLAG_MIPS64_LIBN32 0x0600
800#define FLAG_MIPS64_LIBN64 0x0700
801
802#if defined(__GLIBC__) || defined(__UCLIBC__)
803
804static char *lookup_cache_lib(elfobj *elf, char *fname)
805{
806 int fd;
807 char *strs;
808 static char buf[__PAX_UTILS_PATH_MAX] = "";
809 const char *cachefile = root_rel_path("/etc/ld.so.cache");
810 struct stat st;
811
812 typedef struct {
813 char magic[LDSO_CACHE_MAGIC_LEN];
814 char version[LDSO_CACHE_VER_LEN];
815 int nlibs;
816 } header_t;
817 header_t *header;
818
819 typedef struct {
820 int flags;
821 int sooffset;
822 int liboffset;
823 } libentry_t;
824 libentry_t *libent;
825
826 if (fname == NULL)
827 return NULL;
828
829 if (ldcache == NULL) {
830 if (fstatat(root_fd, cachefile, &st, 0))
831 return NULL;
832
833 fd = openat(root_fd, cachefile, O_RDONLY);
834 if (fd == -1)
835 return NULL;
836
837 /* cache these values so we only map/unmap the cache file once */
838 ldcache_size = st.st_size;
839 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
840 close(fd);
841
842 if (ldcache == MAP_FAILED) {
843 ldcache = NULL;
844 return NULL;
845 }
846
847 if (memcmp(header->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN) ||
848 memcmp(header->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
849 {
850 munmap(ldcache, ldcache_size);
851 ldcache = NULL;
852 return NULL;
853 }
854 } else
855 header = ldcache;
856
857 libent = ldcache + sizeof(header_t);
858 strs = (char *) &libent[header->nlibs];
859
860 for (fd = 0; fd < header->nlibs; ++fd) {
861 /* This should be more fine grained, but for now we assume that
862 * diff arches will not be cached together, and we ignore the
863 * the different multilib mips cases.
864 */
865 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
866 continue;
867 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
868 continue;
869
870 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
871 continue;
872
873 /* Return first hit because that is how the ldso rolls */
874 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
875 break;
876 }
877
878 return buf;
879}
880
881#elif defined(__NetBSD__)
882static char *lookup_cache_lib(elfobj *elf, char *fname)
883{
884 static char buf[__PAX_UTILS_PATH_MAX] = "";
885 static struct stat st;
886 size_t n;
887 char *ldpath;
888
889 array_for_each(ldpath, n, ldpath) {
890 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", ldpath, fname) >= sizeof(buf))
891 continue; /* if the pathname is too long, or something went wrong, ignore */
892
893 if (stat(buf, &st) != 0)
894 continue; /* if the lib doesn't exist in *ldpath, look further */
895
896 /* NetBSD doesn't actually do sanity checks, it just loads the file
897 * and if that doesn't work, continues looking in other directories.
898 * This cannot easily be safely emulated, unfortunately. For now,
899 * just assume that if it exists, it's a valid library. */
900
901 return buf;
902 }
903
904 /* not found in any path */
905 return NULL;
906}
907#else
908#ifdef __ELF__
909#warning Cache support not implemented for your target
910#endif
911static char *lookup_cache_lib(elfobj *elf, char *fname)
912{
913 return NULL;
914}
915#endif
916
917static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
918{
919 unsigned long i;
920 char *needed;
921 void *strtbl_void;
922 char *p;
923
924 /*
925 * -n -> op==0 -> print all
926 * -N -> op==1 -> print requested
927 */
928 if ((op == 0 && !show_needed) || (op == 1 && !find_lib))
929 return NULL;
930
931 strtbl_void = elf_findsecbyname(elf, ".dynstr");
932
933 if (elf->phdr && strtbl_void) {
934#define SHOW_NEEDED(B) \
935 if (elf->elf_class == ELFCLASS ## B) { \
936 Elf ## B ## _Dyn *dyn; \
937 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
938 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
939 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
940 Elf ## B ## _Off offset; \
941 size_t matched = 0; \
942 /* Walk all the program headers to find the PT_DYNAMIC */ \
943 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
944 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) \
945 continue; \
946 offset = EGET(phdr[i].p_offset); \
947 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
948 continue; \
949 /* Walk all the dynamic tags to find NEEDED entries */ \
950 dyn = DYN ## B (elf->vdata + offset); \
951 while (EGET(dyn->d_tag) != DT_NULL) { \
952 if (EGET(dyn->d_tag) == DT_NEEDED) { \
953 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
954 if (offset >= (Elf ## B ## _Off)elf->len) { \
955 ++dyn; \
956 continue; \
957 } \
958 needed = elf->data + offset; \
959 if (op == 0) { \
960 /* -n -> print all entries */ \
961 if (!be_wewy_wewy_quiet) { \
962 if (*found_needed) xchrcat(ret, ',', ret_len); \
963 if (use_ldcache) \
964 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
965 needed = p; \
966 xstrcat(ret, needed, ret_len); \
967 } \
968 *found_needed = 1; \
969 } else { \
970 /* -N -> print matching entries */ \
971 size_t n; \
972 const char *find_lib_name; \
973 \
974 array_for_each(find_lib_arr, n, find_lib_name) { \
975 int invert = 1; \
976 if (find_lib_name[0] == '!') \
977 invert = 0, ++find_lib_name; \
978 if (!strcmp(find_lib_name, needed) == invert) \
979 ++matched; \
980 } \
981 \
982 if (matched == array_cnt(find_lib_arr)) { \
983 *found_lib = 1; \
984 return (be_wewy_wewy_quiet ? NULL : find_lib); \
985 } \
986 } \
987 } \
988 ++dyn; \
989 } \
990 } }
991 SHOW_NEEDED(32)
992 SHOW_NEEDED(64)
993 if (op == 0 && !*found_needed && be_verbose)
994 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
995 }
996
997 return NULL;
998}
999static char *scanelf_file_interp(elfobj *elf, char *found_interp)
1000{
1001 void *strtbl_void;
1002
1003 if (!show_interp) return NULL;
1004
1005 strtbl_void = elf_findsecbyname(elf, ".interp");
1006
1007 if (strtbl_void) {
1008#define SHOW_INTERP(B) \
1009 if (elf->elf_class == ELFCLASS ## B) { \
1010 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
1011 *found_interp = 1; \
1012 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
1013 }
1014 SHOW_INTERP(32)
1015 SHOW_INTERP(64)
1016 }
1017 return NULL;
1018}
1019static char *scanelf_file_bind(elfobj *elf, char *found_bind)
1020{
1021 unsigned long i;
1022 struct stat s;
1023 char dynamic = 0;
1024
1025 if (!show_bind) return NULL;
1026 if (!elf->phdr) return NULL;
1027
1028#define SHOW_BIND(B) \
1029 if (elf->elf_class == ELFCLASS ## B) { \
1030 Elf ## B ## _Dyn *dyn; \
1031 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1032 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1033 Elf ## B ## _Off offset; \
1034 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1035 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1036 dynamic = 1; \
1037 offset = EGET(phdr[i].p_offset); \
1038 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
1039 dyn = DYN ## B (elf->vdata + offset); \
1040 while (EGET(dyn->d_tag) != DT_NULL) { \
1041 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
1042 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
1043 { \
1044 if (be_quiet) return NULL; \
1045 *found_bind = 1; \
1046 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
1047 } \
1048 ++dyn; \
1049 } \
1050 } \
1051 }
1052 SHOW_BIND(32)
1053 SHOW_BIND(64)
1054
1055 if (be_wewy_wewy_quiet) return NULL;
1056
1057 /* don't output anything if quiet mode and the ELF is static or not setuid */
1058 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
1059 return NULL;
1060 } else {
1061 *found_bind = 1;
1062 return (char *)(dynamic ? "LAZY" : "STATIC");
1063 }
1064}
1065static char *scanelf_file_soname(elfobj *elf, char *found_soname)
1066{
1067 unsigned long i;
1068 char *soname;
1069 void *strtbl_void;
1070
1071 if (!show_soname) return NULL;
1072
1073 strtbl_void = elf_findsecbyname(elf, ".dynstr");
1074
1075 if (elf->phdr && strtbl_void) {
1076#define SHOW_SONAME(B) \
1077 if (elf->elf_class == ELFCLASS ## B) { \
1078 Elf ## B ## _Dyn *dyn; \
1079 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1080 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1081 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
1082 Elf ## B ## _Off offset; \
1083 /* only look for soname in shared objects */ \
1084 if (EGET(ehdr->e_type) != ET_DYN) \
1085 return NULL; \
1086 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1087 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1088 offset = EGET(phdr[i].p_offset); \
1089 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
1090 dyn = DYN ## B (elf->vdata + offset); \
1091 while (EGET(dyn->d_tag) != DT_NULL) { \
1092 if (EGET(dyn->d_tag) == DT_SONAME) { \
1093 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
1094 if (offset >= (Elf ## B ## _Off)elf->len) { \
1095 ++dyn; \
1096 continue; \
1097 } \
1098 soname = elf->data + offset; \
1099 *found_soname = 1; \
1100 return (be_wewy_wewy_quiet ? NULL : soname); \
1101 } \
1102 ++dyn; \
1103 } \
1104 } }
1105 SHOW_SONAME(32)
1106 SHOW_SONAME(64)
1107 }
1108
1109 return NULL;
1110}
1111
1112/*
1113 * We support the symbol form:
1114 * [%[modifiers]%][[+-]<symbol name>][,[.....]]
1115 * If the symbol name is empty, then all symbols are matched.
1116 * If the symbol name is a glob ("*"), then all symbols are dumped (debug).
1117 * Do not rely on this output format at all.
1118 * Otherwise the symbol name is used to search (either regex or string compare).
1119 * If the first char of the symbol name is a plus ("+"), then only match
1120 * defined symbols. If it's a minus ("-"), only match undefined symbols.
1121 * Putting modifiers in between the percent signs allows for more in depth
1122 * filters. There are groups of modifiers. If you don't specify a member
1123 * of a group, then all types in that group are matched. The current
1124 * groups and their types are:
1125 * STT group: STT_NOTYPE:n STT_OBJECT:o STT_FUNC:f STT_FILE:F
1126 * STB group: STB_LOCAL:l STB_GLOBAL:g STB_WEAK:w
1127 * SHN group: SHN_UNDEF:u SHN_ABS:a SHN_COMMON:c {defined}:d
1128 * The "defined" value in the SHN group does not correspond to a SHN_xxx define.
1129 * You can search for multiple symbols at once by seperating with a comma (",").
1130 *
1131 * Some examples:
1132 * ELFs with a weak function "foo":
1133 * scanelf -s %wf%foo <ELFs>
1134 * ELFs that define the symbol "main":
1135 * scanelf -s +main <ELFs>
1136 * scanelf -s %d%main <ELFs>
1137 * ELFs that refer to the undefined symbol "brk":
1138 * scanelf -s -brk <ELFs>
1139 * scanelf -s %u%brk <ELFs>
1140 * All global defined objects in an ELF:
1141 * scanelf -s %ogd% <ELF>
1142 */
1143static void
1144scanelf_match_symname(elfobj *elf, char *found_sym, char **ret, size_t *ret_len, const char *symname,
1145 unsigned int stt, unsigned int stb, unsigned int shn, unsigned long size)
1146{
1147 char *this_sym, *next_sym, saved = saved;
1148
1149 /* allow the user to specify a comma delimited list of symbols to search for */
1150 next_sym = NULL;
1151 do {
1152 bool inc_notype, inc_object, inc_func, inc_file,
1153 inc_local, inc_global, inc_weak,
1154 inc_def, inc_undef, inc_abs, inc_common;
1155
1156 if (next_sym) {
1157 next_sym[-1] = saved;
1158 this_sym = next_sym;
1159 } else
1160 this_sym = find_sym;
1161 if ((next_sym = strchr(this_sym, ','))) {
1162 /* make parsing easier by killing the comma temporarily */
1163 saved = *next_sym;
1164 *next_sym = '\0';
1165 next_sym += 1;
1166 }
1167
1168 /* symbol selection! */
1169 inc_notype = inc_object = inc_func = inc_file = \
1170 inc_local = inc_global = inc_weak = \
1171 inc_def = inc_undef = inc_abs = inc_common = \
1172 (*this_sym != '%');
1173
1174 /* parse the contents of %...% */
1175 if (!inc_notype) {
1176 while (*(this_sym++)) {
1177 if (*this_sym == '%') {
1178 ++this_sym;
1179 break;
1180 }
1181 switch (*this_sym) {
1182 case 'n': inc_notype = true; break;
1183 case 'o': inc_object = true; break;
1184 case 'f': inc_func = true; break;
1185 case 'F': inc_file = true; break;
1186 case 'l': inc_local = true; break;
1187 case 'g': inc_global = true; break;
1188 case 'w': inc_weak = true; break;
1189 case 'd': inc_def = true; break;
1190 case 'u': inc_undef = true; break;
1191 case 'a': inc_abs = true; break;
1192 case 'c': inc_common = true; break;
1193 default: err("invalid symbol selector '%c'", *this_sym);
1194 }
1195 }
1196
1197 /* If no types are matched, not match all */
1198 if (!inc_notype && !inc_object && !inc_func && !inc_file)
1199 inc_notype = inc_object = inc_func = inc_file = true;
1200 if (!inc_local && !inc_global && !inc_weak)
1201 inc_local = inc_global = inc_weak = true;
1202 if (!inc_def && !inc_undef && !inc_abs && !inc_common)
1203 inc_def = inc_undef = inc_abs = inc_common = true;
1204
1205 /* backwards compat for defined/undefined short hand */
1206 } else if (*this_sym == '+') {
1207 inc_undef = false;
1208 ++this_sym;
1209 } else if (*this_sym == '-') {
1210 inc_def = inc_abs = inc_common = false;
1211 ++this_sym;
1212 }
1213
1214 /* filter symbols */
1215 if ((!inc_notype && stt == STT_NOTYPE) || \
1216 (!inc_object && stt == STT_OBJECT) || \
1217 (!inc_func && stt == STT_FUNC ) || \
1218 (!inc_file && stt == STT_FILE ) || \
1219 (!inc_local && stb == STB_LOCAL ) || \
1220 (!inc_global && stb == STB_GLOBAL) || \
1221 (!inc_weak && stb == STB_WEAK ) || \
1222 (!inc_def && shn && shn < SHN_LORESERVE) || \
1223 (!inc_undef && shn == SHN_UNDEF ) || \
1224 (!inc_abs && shn == SHN_ABS ) || \
1225 (!inc_common && shn == SHN_COMMON))
1226 continue;
1227
1228 if (*this_sym == '*') {
1229 /* a "*" symbol gets you debug output */
1230 printf("%s(%s) %5lX %15s %15s %15s %s\n",
1231 ((*found_sym == 0) ? "\n\t" : "\t"),
1232 elf->base_filename,
1233 size,
1234 get_elfstttype(stt),
1235 get_elfstbtype(stb),
1236 get_elfshntype(shn),
1237 symname);
1238 goto matched;
1239
1240 } else {
1241 if (g_match) {
1242 /* regex match the symbol */
1243 if (rematch(this_sym, symname, REG_EXTENDED) != 0)
1244 continue;
1245
1246 } else if (*this_sym) {
1247 /* give empty symbols a "pass", else do a normal compare */
1248 const size_t len = strlen(this_sym);
1249 if (!(strncmp(this_sym, symname, len) == 0 &&
1250 /* Accept unversioned symbol names */
1251 (symname[len] == '\0' || symname[len] == '@')))
1252 continue;
1253 }
1254
1255 if (be_semi_verbose) {
1256 char buf[1024];
1257 snprintf(buf, sizeof(buf), "%lX %s %s",
1258 size,
1259 get_elfstttype(stt),
1260 this_sym);
1261 *ret = xstrdup(buf);
1262 } else {
1263 if (*ret) xchrcat(ret, ',', ret_len);
1264 xstrcat(ret, symname, ret_len);
1265 }
1266
1267 goto matched;
1268 }
1269 } while (next_sym);
1270
1271 return;
1272
1273 matched:
1274 *found_sym = 1;
1275 if (next_sym)
1276 next_sym[-1] = saved;
1277}
1278
1279static const char *scanelf_file_sym(elfobj *elf, char *found_sym)
1280{
1281 char *ret;
1282 void *symtab_void, *strtab_void;
1283
1284 if (!find_sym) return NULL;
1285 ret = NULL;
1286
1287 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
1288
1289 if (symtab_void && strtab_void) {
1290#define FIND_SYM(B) \
1291 if (elf->elf_class == ELFCLASS ## B) { \
1292 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
1293 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
1294 Elf ## B ## _Sym *sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
1295 Elf ## B ## _Word i, cnt = EGET(symtab->sh_entsize); \
1296 char *symname; \
1297 size_t ret_len = 0; \
1298 if (cnt) \
1299 cnt = EGET(symtab->sh_size) / cnt; \
1300 for (i = 0; i < cnt; ++i) { \
1301 if ((void*)sym > elf->data_end) { \
1302 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1303 goto break_out; \
1304 } \
1305 if (sym->st_name) { \
1306 /* make sure the symbol name is in acceptable memory range */ \
1307 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
1308 if ((void*)symname > elf->data_end) { \
1309 warnf("%s: corrupt ELF symbols", elf->filename); \
1310 ++sym; \
1311 continue; \
1312 } \
1313 scanelf_match_symname(elf, found_sym, \
1314 &ret, &ret_len, symname, \
1315 ELF##B##_ST_TYPE(EGET(sym->st_info)), \
1316 ELF##B##_ST_BIND(EGET(sym->st_info)), \
1317 EGET(sym->st_shndx), \
1318 /* st_size can be 64bit, but no one is really that big, so screw em */ \
1319 EGET(sym->st_size)); \
1320 } \
1321 ++sym; \
1322 } \
1323 }
1324 FIND_SYM(32)
1325 FIND_SYM(64)
1326 }
1327
1328break_out:
1329 if (be_wewy_wewy_quiet) return NULL;
1330
1331 if (*find_sym != '*' && *found_sym)
1332 return ret;
1333 if (be_quiet)
1334 return NULL;
1335 else
1336 return " - ";
1337}
1338
1339static const char *scanelf_file_sections(elfobj *elf, char *found_section)
1340{
1341 if (!find_section)
1342 return NULL;
1343
1344#define FIND_SECTION(B) \
1345 if (elf->elf_class == ELFCLASS ## B) { \
1346 size_t matched, n; \
1347 int invert; \
1348 const char *section_name; \
1349 Elf ## B ## _Shdr *section; \
1350 \
1351 matched = 0; \
1352 array_for_each(find_section_arr, n, section_name) { \
1353 invert = (*section_name == '!' ? 1 : 0); \
1354 section = SHDR ## B (elf_findsecbyname(elf, section_name + invert)); \
1355 if ((section == NULL && invert) || (section != NULL && !invert)) \
1356 ++matched; \
1357 } \
1358 \
1359 if (matched == array_cnt(find_section_arr)) \
1360 *found_section = 1; \
1361 }
1362 FIND_SECTION(32)
1363 FIND_SECTION(64)
1364
1365 if (be_wewy_wewy_quiet)
1366 return NULL;
1367
1368 if (*found_section)
1369 return find_section;
1370
1371 if (be_quiet)
1372 return NULL;
1373 else
1374 return " - ";
1375}
72 1376
73/* scan an elf file and show all the fun stuff */ 1377/* scan an elf file and show all the fun stuff */
74static void scanelf_file(const char *filename) 1378#define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
1379static int scanelf_elfobj(elfobj *elf)
75{ 1380{
76 int i; 1381 unsigned long i;
77 char found_stack, found_relro, found_textrel, found_rpath; 1382 char found_pax, found_phdr, found_relro, found_load, found_textrel,
78 Elf_Dyn *dyn; 1383 found_rpath, found_needed, found_interp, found_bind, found_soname,
1384 found_sym, found_lib, found_file, found_textrels, found_section;
1385 static char *out_buffer = NULL;
1386 static size_t out_len;
1387
1388 found_pax = found_phdr = found_relro = found_load = found_textrel = \
1389 found_rpath = found_needed = found_interp = found_bind = found_soname = \
1390 found_sym = found_lib = found_file = found_textrels = found_section = 0;
1391
1392 if (be_verbose > 2)
1393 printf("%s: scanning file {%s,%s}\n", elf->filename,
1394 get_elfeitype(EI_CLASS, elf->elf_class),
1395 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
1396 else if (be_verbose > 1)
1397 printf("%s: scanning file\n", elf->filename);
1398
1399 /* init output buffer */
1400 if (!out_buffer) {
1401 out_len = sizeof(char) * 80;
1402 out_buffer = xmalloc(out_len);
1403 }
1404 *out_buffer = '\0';
1405
1406 /* show the header */
1407 if (!be_quiet && show_banner) {
1408 for (i = 0; out_format[i]; ++i) {
1409 if (!IS_MODIFIER(out_format[i])) continue;
1410
1411 switch (out_format[++i]) {
1412 case '+': break;
1413 case '%': break;
1414 case '#': break;
1415 case 'F':
1416 case 'p':
1417 case 'f': prints("FILE "); found_file = 1; break;
1418 case 'o': prints(" TYPE "); break;
1419 case 'x': prints(" PAX "); break;
1420 case 'e': prints("STK/REL/PTL "); break;
1421 case 't': prints("TEXTREL "); break;
1422 case 'r': prints("RPATH "); break;
1423 case 'M': prints("CLASS "); break;
1424 case 'n': prints("NEEDED "); break;
1425 case 'i': prints("INTERP "); break;
1426 case 'b': prints("BIND "); break;
1427 case 'Z': prints("SIZE "); break;
1428 case 'S': prints("SONAME "); break;
1429 case 's': prints("SYM "); break;
1430 case 'N': prints("LIB "); break;
1431 case 'T': prints("TEXTRELS "); break;
1432 case 'k': prints("SECTION "); break;
1433 case 'a': prints("ARCH "); break;
1434 case 'I': prints("OSABI "); break;
1435 case 'Y': prints("EABI "); break;
1436 case 'O': prints("PERM "); break;
1437 case 'D': prints("ENDIAN "); break;
1438 default: warnf("'%c' has no title ?", out_format[i]);
1439 }
1440 }
1441 if (!found_file) prints("FILE ");
1442 prints("\n");
1443 found_file = 0;
1444 show_banner = 0;
1445 }
1446
1447 /* dump all the good stuff */
1448 for (i = 0; out_format[i]; ++i) {
1449 const char *out;
1450 const char *tmp;
1451 static char ubuf[sizeof(unsigned long)*2];
1452 if (!IS_MODIFIER(out_format[i])) {
1453 xchrcat(&out_buffer, out_format[i], &out_len);
1454 continue;
1455 }
1456
1457 out = NULL;
1458 be_wewy_wewy_quiet = (out_format[i] == '#');
1459 be_semi_verbose = (out_format[i] == '+');
1460 switch (out_format[++i]) {
1461 case '+':
1462 case '%':
1463 case '#':
1464 xchrcat(&out_buffer, out_format[i], &out_len); break;
1465 case 'F':
1466 found_file = 1;
1467 if (be_wewy_wewy_quiet) break;
1468 xstrcat(&out_buffer, elf->filename, &out_len);
1469 break;
1470 case 'p':
1471 found_file = 1;
1472 if (be_wewy_wewy_quiet) break;
1473 tmp = elf->filename;
1474 if (search_path) {
1475 ssize_t len_search = strlen(search_path);
1476 ssize_t len_file = strlen(elf->filename);
1477 if (!strncmp(elf->filename, search_path, len_search) && \
1478 len_file > len_search)
1479 tmp += len_search;
1480 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1481 }
1482 xstrcat(&out_buffer, tmp, &out_len);
1483 break;
1484 case 'f':
1485 found_file = 1;
1486 if (be_wewy_wewy_quiet) break;
1487 tmp = strrchr(elf->filename, '/');
1488 tmp = (tmp == NULL ? elf->filename : tmp+1);
1489 xstrcat(&out_buffer, tmp, &out_len);
1490 break;
1491 case 'o': out = get_elfetype(elf); break;
1492 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
1493 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
1494 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1495 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
1496 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1497 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1498 case 'D': out = get_endian(elf); break;
1499 case 'O': out = strfileperms(elf->filename); break;
1500 case 'n':
1501 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
1502 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1503 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1504 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
1505 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1506 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1507 case 'a': out = get_elfemtype(elf); break;
1508 case 'I': out = get_elfosabi(elf); break;
1509 case 'Y': out = get_elf_eabi(elf); break;
1510 case 'Z': snprintf(ubuf, sizeof(ubuf), "%lu", (unsigned long)elf->len); out = ubuf; break;;
1511 default: warnf("'%c' has no scan code?", out_format[i]);
1512 }
1513 if (out)
1514 xstrcat(&out_buffer, out, &out_len);
1515 }
1516
1517#define FOUND_SOMETHING() \
1518 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1519 found_rpath || found_needed || found_interp || found_bind || \
1520 found_soname || found_sym || found_lib || found_textrels || found_section )
1521
1522 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1523 xchrcat(&out_buffer, ' ', &out_len);
1524 xstrcat(&out_buffer, elf->filename, &out_len);
1525 }
1526 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
1527 puts(out_buffer);
1528 fflush(stdout);
1529 }
1530
1531 return 0;
1532}
1533
1534/* scan a single elf */
1535static int scanelf_elf(const char *filename, int fd, size_t len)
1536{
1537 int ret = 1;
79 elfobj *elf = NULL; 1538 elfobj *elf;
80
81 found_stack = found_relro = found_textrel = found_rpath = 0;
82 1539
83 /* verify this is real ELF */ 1540 /* verify this is real ELF */
84 if ((elf = readelf(filename)) == NULL) 1541 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1542 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
85 return; 1543 return 2;
86 if (check_elf_header(elf->ehdr) || !IS_ELF(elf))
87 goto bail;
88
89 /* show the header */
90 if (!be_quiet && show_header) {
91 fputs(" TYPE ", stderr);
92 if (show_pax) fputs(" PAX ", stderr);
93 if (show_stack) fputs(" STACK ", stderr);
94 if (show_textrel) fputs(" TEXTREL ", stderr);
95 if (show_rpath) fputs(" RPATH ", stderr);
96 fputs(" FILE\n", stderr);
97 show_header = 0;
98 }
99
100 /* dump all the good stuff */
101 if (!be_quiet)
102 printf("%-7s ", get_elfetype(elf->ehdr->e_type));
103
104 if (show_pax)
105 printf("%s ", pax_short_hf_flags(PAX_FLAGS(elf)));
106
107 /* stack fun */
108 if (show_stack) {
109 for (i = 0; i < elf->ehdr->e_phnum; i++) {
110 if (elf->phdr[i].p_type != PT_GNU_STACK && \
111 elf->phdr[i].p_type != PT_GNU_RELRO) continue;
112
113 if (be_quiet && !(elf->phdr[i].p_flags & PF_X))
114 continue;
115
116 if (elf->phdr[i].p_type == PT_GNU_STACK)
117 found_stack = 1;
118 if (elf->phdr[i].p_type == PT_GNU_RELRO)
119 found_relro = 1;
120
121 printf("%s ", gnu_short_stack_flags(elf->phdr[i].p_flags));
122 } 1544 }
123 if (!be_quiet && !found_stack) fputs("--- ", stdout); 1545 switch (match_bits) {
124 if (!be_quiet && !found_relro) fputs("--- ", stdout); 1546 case 32:
1547 if (elf->elf_class != ELFCLASS32)
1548 goto label_done;
1549 break;
1550 case 64:
1551 if (elf->elf_class != ELFCLASS64)
1552 goto label_done;
1553 break;
1554 default: break;
125 } 1555 }
126 1556 if (match_etypes) {
127 /* textrel fun */ 1557 char sbuf[126];
128 if (show_textrel) { 1558 strncpy(sbuf, match_etypes, sizeof(sbuf));
129 for (i = 0; i < elf->ehdr->e_phnum; i++) { 1559 if (strchr(match_etypes, ',') != NULL) {
130 if (elf->phdr[i].p_type != PT_DYNAMIC) continue; 1560 char *p;
131 1561 while ((p = strrchr(sbuf, ',')) != NULL) {
132 dyn = (Elf_Dyn *)(elf->data + elf->phdr[i].p_offset); 1562 *p = 0;
133 while (dyn->d_tag != DT_NULL) { 1563 if (etype_lookup(p+1) == get_etype(elf))
134 if (dyn->d_tag == DT_TEXTREL) { //dyn->d_tag != DT_FLAGS) 1564 goto label_ret;
135 found_textrel = 1;
136// if (dyn->d_un.d_val & DF_TEXTREL)
137 fputs("TEXTREL ", stdout);
138 }
139 ++dyn;
140 } 1565 }
141 } 1566 }
142 if (!be_quiet && !found_textrel) fputs("------- ", stdout); 1567 if (etype_lookup(sbuf) != get_etype(elf))
143 } 1568 goto label_done;
144
145 /* rpath fun */
146 /* TODO: if be_quiet, only output RPATH's which aren't in /etc/ld.so.conf */
147 if (show_rpath) {
148 Elf_Shdr *strtbl = elf_findsecbyname(elf, ".dynstr");
149
150 if (strtbl)
151 for (i = 0; i < elf->ehdr->e_phnum; i++) {
152 if (elf->phdr[i].p_type != PT_DYNAMIC) continue;
153
154 dyn = (Elf_Dyn *)(elf->data + elf->phdr[i].p_offset);
155 while (dyn->d_tag != DT_NULL) {
156 if (dyn->d_tag == DT_RPATH) { //|| dyn->d_tag != DT_RUNPATH)
157 char *rpath = elf->data + strtbl->sh_offset + dyn->d_un.d_ptr;
158 found_rpath = 1;
159 printf("%s ", rpath);
160 }
161 ++dyn;
162 }
163 } 1569 }
164 if (!be_quiet && !found_rpath) fputs("- ", stdout);
165 }
166 1570
167 if (!be_quiet || show_pax || found_stack || found_textrel || found_rpath) 1571label_ret:
168 printf("%s\n", filename); 1572 ret = scanelf_elfobj(elf);
169 1573
170bail: 1574label_done:
171 unreadelf(elf); 1575 unreadelf(elf);
1576 return ret;
1577}
1578
1579/* scan an archive of elfs */
1580static int scanelf_archive(const char *filename, int fd, size_t len)
1581{
1582 archive_handle *ar;
1583 archive_member *m;
1584 char *ar_buffer;
1585 elfobj *elf;
1586
1587 ar = ar_open_fd(filename, fd);
1588 if (ar == NULL)
1589 return 1;
1590
1591 ar_buffer = mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1592 while ((m = ar_next(ar)) != NULL) {
1593 off_t cur_pos = lseek(fd, 0, SEEK_CUR);
1594 if (cur_pos == -1)
1595 errp("lseek() failed");
1596 elf = readelf_buffer(m->name, ar_buffer + cur_pos, m->size);
1597 if (elf) {
1598 scanelf_elfobj(elf);
1599 unreadelf(elf);
1600 }
1601 }
1602 munmap(ar_buffer, len);
1603
1604 return 0;
1605}
1606/* scan a file which may be an elf or an archive or some other magical beast */
1607static int scanelf_fileat(int dir_fd, const char *filename, const struct stat *st_cache)
1608{
1609 const struct stat *st = st_cache;
1610 struct stat symlink_st;
1611 int fd;
1612
1613 /* always handle regular files and handle symlinked files if no -y */
1614 if (S_ISLNK(st->st_mode)) {
1615 if (!scan_symlink)
1616 return 1;
1617 fstatat(dir_fd, filename, &symlink_st, 0);
1618 st = &symlink_st;
1619 }
1620
1621 if (!S_ISREG(st->st_mode)) {
1622 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1623 return 1;
1624 }
1625
1626 if (match_perms) {
1627 if ((st->st_mode | match_perms) != st->st_mode)
1628 return 1;
1629 }
1630 fd = openat(dir_fd, filename, (fix_elf ? O_RDWR : O_RDONLY) | O_CLOEXEC);
1631 if (fd == -1)
1632 return 1;
1633
1634 if (scanelf_elf(filename, fd, st->st_size) == 2) {
1635 /* if it isn't an ELF, maybe it's an .a archive */
1636 if (scan_archives)
1637 scanelf_archive(filename, fd, st->st_size);
1638
1639 /*
1640 * unreadelf() implicitly closes its fd, so only close it
1641 * when we are returning it in the non-ELF case
1642 */
1643 close(fd);
1644 }
1645
1646 return 0;
172} 1647}
173 1648
174/* scan a directory for ET_EXEC files and print when we find one */ 1649/* scan a directory for ET_EXEC files and print when we find one */
175static void scanelf_dir(const char *path) 1650static int scanelf_dirat(int dir_fd, const char *path)
176{ 1651{
177 register DIR *dir; 1652 register DIR *dir;
178 register struct dirent *dentry; 1653 register struct dirent *dentry;
179 struct stat st; 1654 struct stat st_top, st;
180 char *p; 1655 char buf[__PAX_UTILS_PATH_MAX], *subpath;
1656 size_t pathlen = 0, len = 0;
181 int len = 0; 1657 int ret = 0;
1658 int subdir_fd;
182 1659
183 /* make sure path exists */ 1660 /* make sure path exists */
184 if (lstat(path, &st) == -1) 1661 if (fstatat(dir_fd, path, &st_top, AT_SYMLINK_NOFOLLOW) == -1) {
1662 if (be_verbose > 2) printf("%s: does not exist\n", path);
185 return; 1663 return 1;
1664 }
186 1665
187 /* ok, if it isn't a directory, assume we can open it */ 1666 /* ok, if it isn't a directory, assume we can open it */
188 if (!S_ISDIR(st.st_mode)) { 1667 if (!S_ISDIR(st_top.st_mode))
189 scanelf_file(path); 1668 return scanelf_fileat(dir_fd, path, &st_top);
190 return;
191 }
192 1669
193 /* now scan the dir looking for fun stuff */ 1670 /* now scan the dir looking for fun stuff */
194 if ((dir = opendir(path)) == NULL) { 1671 subdir_fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
195 warnf("could not opendir %s: %s", path, strerror(errno)); 1672 if (subdir_fd == -1)
1673 dir = NULL;
1674 else
1675 dir = fdopendir(subdir_fd);
1676 if (dir == NULL) {
1677 if (subdir_fd != -1)
1678 close(subdir_fd);
1679 warnfp("could not opendir(%s)", path);
196 return; 1680 return 1;
197 } 1681 }
1682 if (be_verbose > 1) printf("%s: scanning dir\n", path);
198 1683
1684 subpath = stpcpy(buf, path);
1685 *subpath++ = '/';
1686 pathlen = subpath - buf;
199 while ((dentry = readdir(dir))) { 1687 while ((dentry = readdir(dir))) {
200 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1688 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
201 continue; 1689 continue;
202 len = (strlen(path) + 2 + strlen(dentry->d_name)); 1690
203 p = malloc(len); 1691 if (fstatat(subdir_fd, dentry->d_name, &st, AT_SYMLINK_NOFOLLOW) == -1)
204 if (!p) 1692 continue;
205 err("scanelf_dir(): Could not malloc: %s", strerror(errno)); 1693
206 strncpy(p, path, len); 1694 len = strlen(dentry->d_name);
207 strncat(p, "/", len); 1695 if (len + pathlen + 1 >= sizeof(buf)) {
1696 warnf("Skipping '%s%s': len > sizeof(buf); %zu > %zu\n",
1697 path, dentry->d_name, len + pathlen + 1, sizeof(buf));
1698 continue;
1699 }
208 strncat(p, dentry->d_name, len); 1700 memcpy(subpath, dentry->d_name, len);
209 if (lstat(p, &st) != -1) { 1701 subpath[len] = '\0';
1702
210 if (S_ISREG(st.st_mode)) 1703 if (S_ISREG(st.st_mode))
211 scanelf_file(p); 1704 ret = scanelf_fileat(dir_fd, buf, &st);
212 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1705 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1706 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1707 ret = scanelf_dirat(dir_fd, buf);
1708 }
1709 }
1710 closedir(dir);
1711
1712 return ret;
1713}
1714static int scanelf_dir(const char *path)
1715{
1716 return scanelf_dirat(root_fd, root_rel_path(path));
1717}
1718
1719static int scanelf_from_file(const char *filename)
1720{
1721 FILE *fp;
1722 char *p, *path;
1723 size_t len;
1724 int ret;
1725
1726 if (strcmp(filename, "-") == 0)
1727 fp = stdin;
1728 else if ((fp = fopen(filename, "r")) == NULL)
1729 return 1;
1730
1731 path = NULL;
1732 len = 0;
1733 ret = 0;
1734 while (getline(&path, &len, fp) != -1) {
1735 if ((p = strchr(path, '\n')) != NULL)
1736 *p = 0;
1737 search_path = path;
213 scanelf_dir(p); 1738 ret = scanelf_dir(path);
1739 }
1740 free(path);
1741
1742 if (fp != stdin)
1743 fclose(fp);
1744
1745 return ret;
1746}
1747
1748#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1749
1750static int load_ld_cache_config(int i, const char *fname)
1751{
1752 FILE *fp = NULL;
1753 char *p, *path;
1754 size_t len;
1755 int curr_fd = -1;
1756
1757 fp = fopenat_r(root_fd, root_rel_path(fname));
1758 if (fp == NULL)
1759 return i;
1760
1761 path = NULL;
1762 len = 0;
1763 while (getline(&path, &len, fp) != -1) {
1764 if ((p = strrchr(path, '\r')) != NULL)
1765 *p = 0;
1766 if ((p = strchr(path, '\n')) != NULL)
1767 *p = 0;
1768
1769 /* recursive includes of the same file will make this segfault. */
1770 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1771 glob_t gl;
1772 size_t x;
1773 const char *gpath;
1774
1775 /* re-use existing path buffer ... need to be creative */
1776 if (path[8] != '/')
1777 gpath = memcpy(path + 3, "/etc/", 5);
1778 else
1779 gpath = path + 8;
1780 if (root_fd != AT_FDCWD) {
1781 if (curr_fd == -1) {
1782 curr_fd = open(".", O_RDONLY|O_CLOEXEC);
1783 if (fchdir(root_fd))
1784 errp("unable to change to root dir");
1785 }
1786 gpath = root_rel_path(gpath);
214 } 1787 }
1788
1789 if (glob(gpath, 0, NULL, &gl) == 0) {
1790 for (x = 0; x < gl.gl_pathc; ++x) {
1791 /* try to avoid direct loops */
1792 if (strcmp(gl.gl_pathv[x], fname) == 0)
1793 continue;
1794 i = load_ld_cache_config(i, gl.gl_pathv[x]);
1795 }
1796 globfree(&gl);
215 } 1797 }
1798
1799 /* failed globs are ignored by glibc */
1800 continue;
1801 }
1802
1803 if (*path != '/')
1804 continue;
1805
1806 xarraypush_str(ldpaths, path);
1807 }
1808 free(path);
1809
1810 fclose(fp);
1811
1812 if (curr_fd != -1) {
1813 if (fchdir(curr_fd))
1814 /* don't care */;
1815 close(curr_fd);
1816 }
1817
1818 return i;
1819}
1820
1821#elif defined(__FreeBSD__) || defined(__DragonFly__)
1822
1823static int load_ld_cache_config(int i, const char *fname)
1824{
1825 FILE *fp = NULL;
1826 char *b = NULL, *p;
1827 struct elfhints_hdr hdr;
1828
1829 fp = fopenat_r(root_fd, root_rel_path(fname));
1830 if (fp == NULL)
1831 return i;
1832
1833 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1834 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1835 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1836 {
1837 fclose(fp);
1838 return i;
1839 }
1840
1841 b = xmalloc(hdr.dirlistlen + 1);
1842 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1843 fclose(fp);
216 free(p); 1844 free(b);
1845 return i;
217 } 1846 }
218 closedir(dir); 1847
1848 while ((p = strsep(&b, ":"))) {
1849 if (*p == '\0')
1850 continue;
1851 xarraypush_str(ldpaths, p);
1852 }
1853
1854 free(b);
1855 fclose(fp);
1856 return i;
219} 1857}
1858
1859#else
1860#ifdef __ELF__
1861#warning Cache config support not implemented for your target
1862#endif
1863static int load_ld_cache_config(int i, const char *fname)
1864{
1865 return 0;
1866}
1867#endif
220 1868
221/* scan /etc/ld.so.conf for paths */ 1869/* scan /etc/ld.so.conf for paths */
222static void scanelf_ldpath() 1870static void scanelf_ldpath(void)
223{ 1871{
224 char *path, *p; 1872 char scan_l, scan_ul, scan_ull;
225 FILE *fp; 1873 size_t n;
1874 const char *ldpath;
1875 int i = 0;
226 1876
227 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1877 if (array_cnt(ldpaths) == 0)
228 err("Unable to open ld.so.conf: %s", strerror(errno)); 1878 err("Unable to load any paths from ld.so.conf");
229 1879
230 path = malloc(_POSIX_PATH_MAX); 1880 scan_l = scan_ul = scan_ull = 0;
231 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) 1881
232 if (*path == '/') { 1882 array_for_each(ldpaths, n, ldpath) {
233 if ((p = strrchr(path, '\r')) != NULL) 1883 if (!scan_l && !strcmp(ldpath, "/lib")) scan_l = 1;
234 *p = 0; 1884 if (!scan_ul && !strcmp(ldpath, "/usr/lib")) scan_ul = 1;
235 if ((p = strrchr(path, '\n')) != NULL) 1885 if (!scan_ull && !strcmp(ldpath, "/usr/local/lib")) scan_ull = 1;
236 *p = 0;
237 scanelf_dir(path); 1886 scanelf_dir(ldpath);
1887 ++i;
238 } 1888 }
239 free(path);
240 1889
241 fclose(fp); 1890 if (!scan_l) scanelf_dir("/lib");
1891 if (!scan_ul) scanelf_dir("/usr/lib");
1892 if (!scan_ull) scanelf_dir("/usr/local/lib");
242} 1893}
243 1894
244/* scan env PATH for paths */ 1895/* scan env PATH for paths */
245static void scanelf_envpath() 1896static void scanelf_envpath(void)
246{ 1897{
247 char *path, *p; 1898 char *path, *p;
248 1899
249 path = getenv("PATH"); 1900 path = getenv("PATH");
250 if (!path) 1901 if (!path)
251 err("PATH is not set in your env !"); 1902 err("PATH is not set in your env !");
252 1903 path = xstrdup(path);
253 if ((path = strdup(path)) == NULL)
254 err("stdup failed: %s", strerror(errno));
255 1904
256 while ((p = strrchr(path, ':')) != NULL) { 1905 while ((p = strrchr(path, ':')) != NULL) {
257 scanelf_dir(p + 1); 1906 scanelf_dir(p + 1);
258 *p = 0; 1907 *p = 0;
259 } 1908 }
1909
260 free(path); 1910 free(path);
261} 1911}
262 1912
263 1913/* usage / invocation handling functions */ /* Free Flags: c d j u w G H J K P Q U W */
264 1914#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZCBhV"
265/* usage / invocation handling functions */ 1915#define a_argument required_argument
266#define PARSE_FLAGS "plRxstraqhV"
267static struct option const long_opts[] = { 1916static struct option const long_opts[] = {
268 {"path", no_argument, NULL, 'p'}, 1917 {"path", no_argument, NULL, 'p'},
269 {"ldpath", no_argument, NULL, 'l'}, 1918 {"ldpath", no_argument, NULL, 'l'},
1919 {"root", a_argument, NULL, 128},
270 {"recursive", no_argument, NULL, 'R'}, 1920 {"recursive", no_argument, NULL, 'R'},
1921 {"mount", no_argument, NULL, 'm'},
1922 {"symlink", no_argument, NULL, 'y'},
1923 {"archives", no_argument, NULL, 'A'},
1924 {"ldcache", no_argument, NULL, 'L'},
1925 {"fix", no_argument, NULL, 'X'},
1926 {"setpax", a_argument, NULL, 'z'},
271 {"pax", no_argument, NULL, 'x'}, 1927 {"pax", no_argument, NULL, 'x'},
272 {"stack", no_argument, NULL, 's'}, 1928 {"header", no_argument, NULL, 'e'},
273 {"textrel", no_argument, NULL, 't'}, 1929 {"textrel", no_argument, NULL, 't'},
274 {"rpath", no_argument, NULL, 'r'}, 1930 {"rpath", no_argument, NULL, 'r'},
1931 {"needed", no_argument, NULL, 'n'},
1932 {"interp", no_argument, NULL, 'i'},
1933 {"bind", no_argument, NULL, 'b'},
1934 {"soname", no_argument, NULL, 'S'},
1935 {"symbol", a_argument, NULL, 's'},
1936 {"section", a_argument, NULL, 'k'},
1937 {"lib", a_argument, NULL, 'N'},
1938 {"gmatch", no_argument, NULL, 'g'},
1939 {"textrels", no_argument, NULL, 'T'},
1940 {"etype", a_argument, NULL, 'E'},
1941 {"bits", a_argument, NULL, 'M'},
1942 {"endian", no_argument, NULL, 'D'},
1943 {"osabi", no_argument, NULL, 'I'},
1944 {"eabi", no_argument, NULL, 'Y'},
1945 {"perms", a_argument, NULL, 'O'},
1946 {"size", no_argument, NULL, 'Z'},
275 {"all", no_argument, NULL, 'a'}, 1947 {"all", no_argument, NULL, 'a'},
276 {"quiet", no_argument, NULL, 'q'}, 1948 {"quiet", no_argument, NULL, 'q'},
277/* {"vebose", no_argument, NULL, 'v'},*/ 1949 {"verbose", no_argument, NULL, 'v'},
1950 {"format", a_argument, NULL, 'F'},
1951 {"from", a_argument, NULL, 'f'},
1952 {"file", a_argument, NULL, 'o'},
1953 {"nocolor", no_argument, NULL, 'C'},
1954 {"nobanner", no_argument, NULL, 'B'},
278 {"help", no_argument, NULL, 'h'}, 1955 {"help", no_argument, NULL, 'h'},
279 {"version", no_argument, NULL, 'V'}, 1956 {"version", no_argument, NULL, 'V'},
280 {NULL, no_argument, NULL, 0x0} 1957 {NULL, no_argument, NULL, 0x0}
281}; 1958};
1959
282static char *opts_help[] = { 1960static const char * const opts_help[] = {
283 "Scan all directories in PATH environment", 1961 "Scan all directories in PATH environment",
284 "Scan all directories in /etc/ld.so.conf", 1962 "Scan all directories in /etc/ld.so.conf",
1963 "Root directory (use with -l or -p)",
285 "Scan directories recursively\n", 1964 "Scan directories recursively",
1965 "Don't recursively cross mount points",
1966 "Don't scan symlinks",
1967 "Scan archives (.a files)",
1968 "Utilize ld.so.cache to show full path (use with -r/-n)",
1969 "Try and 'fix' bad things (use with -r/-e)",
1970 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
286 "Print PaX markings", 1971 "Print PaX markings",
287 "Print GNU_STACK markings", 1972 "Print GNU_STACK/PT_LOAD markings",
288 "Print TEXTREL information", 1973 "Print TEXTREL information",
289 "Print RPATH information", 1974 "Print RPATH information",
290 "Print all scanned info", 1975 "Print NEEDED information",
1976 "Print INTERP information",
1977 "Print BIND information",
1978 "Print SONAME information",
1979 "Find a specified symbol",
1980 "Find a specified section",
1981 "Find a specified library",
1982 "Use regex matching rather than string compare (use with -s)",
1983 "Locate cause of TEXTREL",
1984 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1985 "Print only ELF files matching numeric bits",
1986 "Print Endianness",
1987 "Print OSABI",
1988 "Print EABI (EM_ARM Only)",
1989 "Print only ELF files matching octal permissions",
1990 "Print ELF file size",
1991 "Print all useful/simple info\n",
291 "Only output 'bad' things\n", 1992 "Only output 'bad' things",
292/* "Be verbose !",*/ 1993 "Be verbose (can be specified more than once)",
1994 "Use specified format for output",
1995 "Read input stream from a filename",
1996 "Write output stream to a filename",
1997 "Don't emit color in output",
1998 "Don't display the header",
293 "Print this help and exit", 1999 "Print this help and exit",
294 "Print version and exit", 2000 "Print version and exit",
295 NULL 2001 NULL
296}; 2002};
297 2003
298/* display usage and exit */ 2004/* display usage and exit */
299static void usage(int status) 2005static void usage(int status)
300{ 2006{
2007 unsigned long i;
2008 printf("* Scan ELF binaries for stuff\n\n"
2009 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
2010 printf("Options: -[%s]\n", PARSE_FLAGS);
2011 for (i = 0; long_opts[i].name; ++i)
2012 if (long_opts[i].has_arg == no_argument)
2013 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
2014 long_opts[i].name, opts_help[i]);
2015 else if (long_opts[i].val > '~')
2016 printf(" --%-7s <arg> * %s\n",
2017 long_opts[i].name, opts_help[i]);
2018 else
2019 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
2020 long_opts[i].name, opts_help[i]);
2021
2022 puts("\nFor more information, see the scanelf(1) manpage");
2023 exit(status);
2024}
2025
2026/* parse command line arguments and preform needed actions */
2027#define do_pax_state(option, flag) \
2028 if (islower(option)) { \
2029 flags &= ~PF_##flag; \
2030 flags |= PF_NO##flag; \
2031 } else { \
2032 flags &= ~PF_NO##flag; \
2033 flags |= PF_##flag; \
2034 }
2035static int parseargs(int argc, char *argv[])
2036{
301 int i; 2037 int i;
302 printf(" Scan ELF binaries for stuff\n\n" 2038 const char *from_file = NULL;
303 "Usage: %s [options] <dir1> [dir2 dirN ...]\n\n", argv0); 2039 int ret = 0;
304 fputs("Options:\n", stdout);
305 for (i = 0; long_opts[i].name; ++i)
306 printf(" -%c, --%-12s %s\n", long_opts[i].val,
307 long_opts[i].name, opts_help[i]);
308 exit(status);
309}
310
311/* parse command line arguments and preform needed actions */
312static void parseargs(int argc, char *argv[])
313{
314 int flag;
315 2040
316 opterr = 0; 2041 opterr = 0;
317 while ((flag=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 2042 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
318 switch (flag) { 2043 switch (i) {
319 2044
320 case 'V': /* version info */ 2045 case 'V':
321 printf("%s compiled %s\n" 2046 printf("pax-utils-%s: %s compiled %s\n%s\n"
322 "%s written for Gentoo Linux by <solar and vapier @ gentoo.org>\n" 2047 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
323 "%s\n",
324 __FILE__, __DATE__, argv0, rcsid); 2048 VERSION, __FILE__, __DATE__, rcsid, argv0);
325 exit(EXIT_SUCCESS); 2049 exit(EXIT_SUCCESS);
326 break; 2050 break;
327 case 'h': usage(EXIT_SUCCESS); break; 2051 case 'h': usage(EXIT_SUCCESS); break;
2052 case 'f':
2053 if (from_file) warn("You prob don't want to specify -f twice");
2054 from_file = optarg;
2055 break;
2056 case 'E':
2057 match_etypes = optarg;
2058 break;
2059 case 'M':
2060 match_bits = atoi(optarg);
2061 if (match_bits == 0) {
2062 if (strcmp(optarg, "ELFCLASS32") == 0)
2063 match_bits = 32;
2064 if (strcmp(optarg, "ELFCLASS64") == 0)
2065 match_bits = 64;
2066 }
2067 break;
2068 case 'O':
2069 if (sscanf(optarg, "%o", &match_perms) == -1)
2070 match_bits = 0;
2071 break;
2072 case 'o': {
2073 if (freopen(optarg, "w", stdout) == NULL)
2074 errp("Could not freopen(%s)", optarg);
2075 break;
2076 }
2077 case 'k':
2078 xarraypush_str(find_section_arr, optarg);
2079 break;
2080 case 's': {
2081 if (find_sym) warn("You prob don't want to specify -s twice");
2082 find_sym = optarg;
2083 break;
2084 }
2085 case 'N':
2086 xarraypush_str(find_lib_arr, optarg);
2087 break;
2088 case 'F': {
2089 if (out_format) warn("You prob don't want to specify -F twice");
2090 out_format = optarg;
2091 break;
2092 }
2093 case 'z': {
2094 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
2095 size_t x;
328 2096
2097 for (x = 0; x < strlen(optarg); x++) {
2098 switch (optarg[x]) {
2099 case 'p':
2100 case 'P':
2101 do_pax_state(optarg[x], PAGEEXEC);
2102 break;
2103 case 's':
2104 case 'S':
2105 do_pax_state(optarg[x], SEGMEXEC);
2106 break;
2107 case 'm':
2108 case 'M':
2109 do_pax_state(optarg[x], MPROTECT);
2110 break;
2111 case 'e':
2112 case 'E':
2113 do_pax_state(optarg[x], EMUTRAMP);
2114 break;
2115 case 'r':
2116 case 'R':
2117 do_pax_state(optarg[x], RANDMMAP);
2118 break;
2119 case 'x':
2120 case 'X':
2121 do_pax_state(optarg[x], RANDEXEC);
2122 break;
2123 default:
2124 break;
2125 }
2126 }
2127 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
2128 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
2129 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
2130 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
2131 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
2132 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
2133 setpax = flags;
2134 break;
2135 }
2136 case 'Z': show_size = 1; break;
2137 case 'g': g_match = 1; break;
2138 case 'L': use_ldcache = 1; break;
2139 case 'y': scan_symlink = 0; break;
2140 case 'A': scan_archives = 1; break;
2141 case 'C': color_init(true); break;
2142 case 'B': show_banner = 0; break;
329 case 'l': scan_ldpath = 1; break; 2143 case 'l': scan_ldpath = 1; break;
330 case 'p': scan_envpath = 1; break; 2144 case 'p': scan_envpath = 1; break;
331 case 'R': dir_recurse = 1; break; 2145 case 'R': dir_recurse = 1; break;
2146 case 'm': dir_crossmount = 0; break;
2147 case 'X': ++fix_elf; break;
332 case 'x': show_pax = 1; break; 2148 case 'x': show_pax = 1; break;
333 case 's': show_stack = 1; break; 2149 case 'e': show_phdr = 1; break;
334 case 't': show_textrel = 1; break; 2150 case 't': show_textrel = 1; break;
335 case 'r': show_rpath = 1; break; 2151 case 'r': show_rpath = 1; break;
2152 case 'n': show_needed = 1; break;
2153 case 'i': show_interp = 1; break;
2154 case 'b': show_bind = 1; break;
2155 case 'S': show_soname = 1; break;
2156 case 'T': show_textrels = 1; break;
336 case 'q': be_quiet = 1; break; 2157 case 'q': be_quiet = 1; break;
337 case 'a': show_pax = show_stack = show_textrel = show_rpath = 1; break; 2158 case 'v': be_verbose = (be_verbose % 20) + 1; break;
338 2159 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
2160 case 'D': show_endian = 1; break;
2161 case 'I': show_osabi = 1; break;
2162 case 'Y': show_eabi = 1; break;
2163 case 128:
2164 root_fd = open(optarg, O_RDONLY|O_CLOEXEC);
2165 if (root_fd == -1)
2166 err("Could not open root: %s", optarg);
2167 break;
339 case ':': 2168 case ':':
340 warn("Option missing parameter"); 2169 err("Option '%c' is missing parameter", optopt);
341 usage(EXIT_FAILURE);
342 break;
343 case '?': 2170 case '?':
344 warn("Unknown option"); 2171 err("Unknown option '%c' or argument missing", optopt);
345 usage(EXIT_FAILURE);
346 break;
347 default: 2172 default:
348 err("Unhandled option '%c'", flag); 2173 err("Unhandled option '%c'; please report this", i);
349 break; 2174 }
2175 }
2176 if (show_textrels && be_verbose)
2177 has_objdump = bin_in_path("objdump");
2178 /* flatten arrays for display */
2179 if (array_cnt(find_lib_arr))
2180 find_lib = array_flatten_str(find_lib_arr);
2181 if (array_cnt(find_section_arr))
2182 find_section = array_flatten_str(find_section_arr);
2183 /* let the format option override all other options */
2184 if (out_format) {
2185 show_pax = show_phdr = show_textrel = show_rpath = \
2186 show_needed = show_interp = show_bind = show_soname = \
2187 show_textrels = show_perms = show_endian = show_size = \
2188 show_osabi = show_eabi = 0;
2189 for (i = 0; out_format[i]; ++i) {
2190 if (!IS_MODIFIER(out_format[i])) continue;
2191
2192 switch (out_format[++i]) {
2193 case '+': break;
2194 case '%': break;
2195 case '#': break;
2196 case 'F': break;
2197 case 'p': break;
2198 case 'f': break;
2199 case 'k': break;
2200 case 's': break;
2201 case 'N': break;
2202 case 'o': break;
2203 case 'a': break;
2204 case 'M': break;
2205 case 'Z': show_size = 1; break;
2206 case 'D': show_endian = 1; break;
2207 case 'I': show_osabi = 1; break;
2208 case 'Y': show_eabi = 1; break;
2209 case 'O': show_perms = 1; break;
2210 case 'x': show_pax = 1; break;
2211 case 'e': show_phdr = 1; break;
2212 case 't': show_textrel = 1; break;
2213 case 'r': show_rpath = 1; break;
2214 case 'n': show_needed = 1; break;
2215 case 'i': show_interp = 1; break;
2216 case 'b': show_bind = 1; break;
2217 case 'S': show_soname = 1; break;
2218 case 'T': show_textrels = 1; break;
2219 default:
2220 err("Invalid format specifier '%c' (byte %i)",
2221 out_format[i], i+1);
350 } 2222 }
351 } 2223 }
352 2224
2225 /* construct our default format */
2226 } else {
2227 size_t fmt_len = 30;
2228 out_format = xmalloc(sizeof(char) * fmt_len);
2229 *out_format = '\0';
2230 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
2231 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
2232 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
2233 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
2234 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
2235 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
2236 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
2237 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
2238 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
2239 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
2240 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
2241 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
2242 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
2243 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
2244 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
2245 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
2246 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
2247 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
2248 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
2249 }
2250 if (be_verbose > 2) printf("Format: %s\n", out_format);
2251
2252 /* now lets actually do the scanning */
2253 if (scan_ldpath || use_ldcache)
2254 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
353 if (scan_ldpath) scanelf_ldpath(); 2255 if (scan_ldpath) scanelf_ldpath();
354 if (scan_envpath) scanelf_envpath(); 2256 if (scan_envpath) scanelf_envpath();
2257 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
2258 from_file = "-";
2259 if (from_file) {
2260 scanelf_from_file(from_file);
2261 from_file = *argv;
2262 }
2263 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
2264 err("Nothing to scan !?");
355 while (optind < argc) 2265 while (optind < argc) {
356 scanelf_dir(argv[optind++]); 2266 search_path = argv[optind++];
357} 2267 ret = scanelf_dir(search_path);
2268 }
358 2269
2270 /* clean up */
2271 xarrayfree(ldpaths);
2272 xarrayfree(find_lib_arr);
2273 xarrayfree(find_section_arr);
2274 free(find_lib);
2275 free(find_section);
359 2276
2277 if (ldcache != 0)
2278 munmap(ldcache, ldcache_size);
2279 return ret;
2280}
2281
2282static char **get_split_env(const char *envvar)
2283{
2284 const char *delims = " \t\n";
2285 char **envvals = NULL;
2286 char *env, *s;
2287 int nentry;
2288
2289 if ((env = getenv(envvar)) == NULL)
2290 return NULL;
2291
2292 env = xstrdup(env);
2293 if (env == NULL)
2294 return NULL;
2295
2296 s = strtok(env, delims);
2297 if (s == NULL) {
2298 free(env);
2299 return NULL;
2300 }
2301
2302 nentry = 0;
2303 while (s != NULL) {
2304 ++nentry;
2305 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
2306 envvals[nentry-1] = s;
2307 s = strtok(NULL, delims);
2308 }
2309 envvals[nentry] = NULL;
2310
2311 /* don't want to free(env) as it contains the memory that backs
2312 * the envvals array of strings */
2313 return envvals;
2314}
2315
2316static void parseenv(void)
2317{
2318 color_init(false);
2319 qa_textrels = get_split_env("QA_TEXTRELS");
2320 qa_execstack = get_split_env("QA_EXECSTACK");
2321 qa_wx_load = get_split_env("QA_WX_LOAD");
2322}
2323
2324#ifdef __PAX_UTILS_CLEANUP
2325static void cleanup(void)
2326{
2327 free(out_format);
2328 free(qa_textrels);
2329 free(qa_execstack);
2330 free(qa_wx_load);
2331}
2332#endif
360 2333
361int main(int argc, char *argv[]) 2334int main(int argc, char *argv[])
362{ 2335{
2336 int ret;
363 if (argc < 2) 2337 if (argc < 2)
364 usage(EXIT_FAILURE); 2338 usage(EXIT_FAILURE);
2339 parseenv();
365 parseargs(argc, argv); 2340 ret = parseargs(argc, argv);
366 return EXIT_SUCCESS; 2341 fclose(stdout);
2342#ifdef __PAX_UTILS_CLEANUP
2343 cleanup();
2344 warn("The calls to add/delete heap should be off:\n"
2345 "\t- 1 due to the out_buffer not being freed in scanelf_fileat()\n"
2346 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
2347#endif
2348 return ret;
367} 2349}
2350
2351/* Match filename against entries in matchlist, return TRUE
2352 * if the file is listed */
2353static int file_matches_list(const char *filename, char **matchlist)
2354{
2355 char **file;
2356 char *match;
2357 char buf[__PAX_UTILS_PATH_MAX];
2358
2359 if (matchlist == NULL)
2360 return 0;
2361
2362 for (file = matchlist; *file != NULL; file++) {
2363 if (search_path) {
2364 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2365 match = buf;
2366 } else {
2367 match = *file;
2368 }
2369 if (fnmatch(match, filename, 0) == 0)
2370 return 1;
2371 }
2372 return 0;
2373}

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