/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.85 Revision 1.119
1/* 1/*
2 * Copyright 2003-2005 Gentoo Foundation 2 * Copyright 2003-2006 Gentoo Foundation
3 * Distributed under the terms of the GNU General Public License v2 3 * Distributed under the terms of the GNU General Public License v2
4 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.85 2005/07/25 23:31:32 vapier Exp $ 4 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.119 2006/02/05 02:25:58 solar Exp $
5 * 5 *
6 ******************************************************************** 6 * Copyright 2003-2006 Ned Ludd - <solar@gentoo.org>
7 * This program is free software; you can redistribute it and/or 7 * Copyright 2004-2006 Mike Frysinger - <vapier@gentoo.org>
8 * modify it under the terms of the GNU General Public License as
9 * published by the Free Software Foundation; either version 2 of the
10 * License, or (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
20 * MA 02111-1307, USA.
21 */ 8 */
22 9
23#include <stdio.h>
24#include <stdlib.h>
25#include <sys/types.h>
26#include <libgen.h>
27#include <limits.h>
28#define __USE_GNU
29#include <string.h>
30#include <errno.h>
31#include <unistd.h>
32#include <sys/stat.h>
33#include <dirent.h>
34#include <getopt.h>
35#include <assert.h>
36#include "paxelf.h" 10#include "paxinc.h"
37 11
38static const char *rcsid = "$Id: scanelf.c,v 1.85 2005/07/25 23:31:32 vapier Exp $"; 12static const char *rcsid = "$Id: scanelf.c,v 1.119 2006/02/05 02:25:58 solar Exp $";
39#define argv0 "scanelf" 13#define argv0 "scanelf"
40 14
41#define IS_MODIFIER(c) (c == '%' || c == '#') 15#define IS_MODIFIER(c) (c == '%' || c == '#')
42 16
43 17
44 18
45/* prototypes */ 19/* prototypes */
20static int scanelf_elfobj(elfobj *elf);
21static int scanelf_elf(const char *filename, int fd, size_t len);
22static int scanelf_archive(const char *filename, int fd, size_t len);
46static void scanelf_file(const char *filename); 23static void scanelf_file(const char *filename);
47static void scanelf_dir(const char *path); 24static void scanelf_dir(const char *path);
48static void scanelf_ldpath(); 25static void scanelf_ldpath(void);
49static void scanelf_envpath(); 26static void scanelf_envpath(void);
50static void usage(int status); 27static void usage(int status);
51static void parseargs(int argc, char *argv[]); 28static void parseargs(int argc, char *argv[]);
52static char *xstrdup(const char *s); 29static char *xstrdup(const char *s);
53static void *xmalloc(size_t size); 30static void *xmalloc(size_t size);
54static void xstrcat(char **dst, const char *src, size_t *curr_len); 31static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n);
32#define xstrcat(dst,src,curr_len) xstrncat(dst,src,curr_len,0)
55static inline void xchrcat(char **dst, const char append, size_t *curr_len); 33static inline void xchrcat(char **dst, const char append, size_t *curr_len);
56 34
57/* variables to control behavior */ 35/* variables to control behavior */
36static char match_etypes[126] = "";
58static char *ldpaths[256]; 37static char *ldpaths[256];
59static char scan_ldpath = 0; 38static char scan_ldpath = 0;
60static char scan_envpath = 0; 39static char scan_envpath = 0;
61static char scan_symlink = 1; 40static char scan_symlink = 1;
41static char scan_archives = 0;
62static char dir_recurse = 0; 42static char dir_recurse = 0;
63static char dir_crossmount = 1; 43static char dir_crossmount = 1;
64static char show_pax = 0; 44static char show_pax = 0;
65static char show_phdr = 0; 45static char show_phdr = 0;
66static char show_textrel = 0; 46static char show_textrel = 0;
76static char be_wewy_wewy_quiet = 0; 56static char be_wewy_wewy_quiet = 0;
77static char *find_sym = NULL, *versioned_symname = NULL; 57static char *find_sym = NULL, *versioned_symname = NULL;
78static char *find_lib = NULL; 58static char *find_lib = NULL;
79static char *out_format = NULL; 59static char *out_format = NULL;
80static char *search_path = NULL; 60static char *search_path = NULL;
61static char fix_elf = 0;
62static char gmatch = 0;
63static char use_ldcache = 0;
81 64
82 65
66caddr_t ldcache = 0;
67size_t ldcache_size = 0;
83 68
84/* sub-funcs for scanelf_file() */ 69/* sub-funcs for scanelf_file() */
85static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab) 70static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
86{ 71{
87 /* find the best SHT_DYNSYM and SHT_STRTAB sections */ 72 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
108 GET_SYMTABS(32) 93 GET_SYMTABS(32)
109 GET_SYMTABS(64) 94 GET_SYMTABS(64)
110} 95}
111static char *scanelf_file_pax(elfobj *elf, char *found_pax) 96static char *scanelf_file_pax(elfobj *elf, char *found_pax)
112{ 97{
113 static char *paxflags;
114 static char ret[7]; 98 static char ret[7];
115 unsigned long i, shown; 99 unsigned long i, shown;
116 100
117 if (!show_pax) return NULL; 101 if (!show_pax) return NULL;
118 102
139 SHOW_PAX(64) 123 SHOW_PAX(64)
140 } 124 }
141 125
142 /* fall back to EI_PAX if no PT_PAX was found */ 126 /* fall back to EI_PAX if no PT_PAX was found */
143 if (!*ret) { 127 if (!*ret) {
128 static char *paxflags;
144 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf)); 129 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
145 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) { 130 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
146 *found_pax = 1; 131 *found_pax = 1;
147 return paxflags; 132 return (be_wewy_wewy_quiet ? NULL : paxflags);
148 } 133 }
149 strncpy(ret, paxflags, sizeof(ret)); 134 strncpy(ret, paxflags, sizeof(ret));
150 } 135 }
151 136
152 if (be_quiet && !shown) 137 if (be_wewy_wewy_quiet || (be_quiet && !shown))
153 return NULL; 138 return NULL;
139 else
154 return ret; 140 return ret;
155
156} 141}
142
157static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load) 143static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
158{ 144{
159 static char ret[12]; 145 static char ret[12];
160 char *found; 146 char *found;
161 unsigned long i, off, shown, check_flags;
162 unsigned char multi_stack, multi_relro, multi_load; 147 unsigned long i, shown, multi_stack, multi_relro, multi_load;
148 int max_pt_load;
163 149
164 if (!show_phdr) return NULL; 150 if (!show_phdr) return NULL;
165 151
166 memcpy(ret, "--- --- ---\0", 12); 152 memcpy(ret, "--- --- ---\0", 12);
167 153
168 shown = 0; 154 shown = 0;
169 multi_stack = multi_relro = multi_load = 0; 155 multi_stack = multi_relro = multi_load = 0;
156 max_pt_load = elf_max_pt_load(elf);
170 157
171 if (elf->phdr) { 158#define NOTE_GNU_STACK ".note.GNU-stack"
172#define SHOW_PHDR(B) \ 159#define SHOW_PHDR(B) \
173 if (elf->elf_class == ELFCLASS ## B) { \ 160 if (elf->elf_class == ELFCLASS ## B) { \
174 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 161 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
162 Elf ## B ## _Off offset; \
163 uint32_t flags, check_flags; \
164 if (elf->phdr != NULL) { \
175 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 165 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
176 uint32_t flags; \
177 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 166 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
178 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \ 167 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
179 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \ 168 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
180 found = found_phdr; \ 169 found = found_phdr; \
181 off = 0; \ 170 offset = 0; \
182 check_flags = PF_X; \ 171 check_flags = PF_X; \
183 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \ 172 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
184 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \ 173 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
185 found = found_relro; \ 174 found = found_relro; \
186 off = 4; \ 175 offset = 4; \
187 check_flags = PF_X; \ 176 check_flags = PF_X; \
188 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \ 177 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
178 if (ehdr->e_type == ET_DYN || ehdr->e_type == ET_EXEC) \
189 if (multi_load++ > 2) warnf("%s: more than 2 PT_LOAD's !?", elf->filename); \ 179 if (multi_load++ > max_pt_load) warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
190 found = found_load; \ 180 found = found_load; \
191 off = 8; \ 181 offset = 8; \
192 check_flags = PF_W|PF_X; \ 182 check_flags = PF_W|PF_X; \
193 } else \ 183 } else \
194 continue; \ 184 continue; \
195 flags = EGET(phdr[i].p_flags); \ 185 flags = EGET(phdr[i].p_flags); \
196 if (be_quiet && ((flags & check_flags) != check_flags)) \ 186 if (be_quiet && ((flags & check_flags) != check_flags)) \
197 continue; \ 187 continue; \
188 if (fix_elf && ((flags & PF_X) != flags)) { \
189 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
190 ret[3] = ret[7] = '!'; \
191 flags = EGET(phdr[i].p_flags); \
192 } \
198 memcpy(ret+off, gnu_short_stack_flags(flags), 3); \ 193 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
199 *found = 1; \ 194 *found = 1; \
200 ++shown; \ 195 ++shown; \
196 } \
197 } else if (elf->shdr != NULL) { \
198 /* no program headers which means this is prob an object file */ \
199 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
200 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
201 char *str; \
202 if ((void*)strtbl > (void*)elf->data_end) \
203 goto skip_this_shdr##B; \
204 check_flags = SHF_WRITE|SHF_EXECINSTR; \
205 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
206 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
207 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
208 str = elf->data + offset; \
209 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
210 if (!strcmp(str, NOTE_GNU_STACK)) { \
211 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
212 flags = EGET(shdr[i].sh_flags); \
213 if (be_quiet && ((flags & check_flags) != check_flags)) \
214 continue; \
215 ++*found_phdr; \
216 shown = 1; \
217 if (flags & SHF_WRITE) ret[0] = 'W'; \
218 if (flags & SHF_ALLOC) ret[1] = 'A'; \
219 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
220 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
221 break; \
222 } \
223 } \
224 skip_this_shdr##B: \
225 if (!multi_stack) { \
226 *found_phdr = 1; \
227 shown = 1; \
228 memcpy(ret, "!WX", 3); \
229 } \
201 } \ 230 } \
202 } 231 }
203 SHOW_PHDR(32) 232 SHOW_PHDR(32)
204 SHOW_PHDR(64) 233 SHOW_PHDR(64)
205 }
206 234
207 if (be_quiet && !shown) 235 if (be_wewy_wewy_quiet || (be_quiet && !shown))
208 return NULL; 236 return NULL;
209 else 237 else
210 return ret; 238 return ret;
211} 239}
212static char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 240static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
213{ 241{
214 static char ret[] = "TEXTREL"; 242 static const char *ret = "TEXTREL";
215 unsigned long i; 243 unsigned long i;
216 244
217 if (!show_textrel && !show_textrels) return NULL; 245 if (!show_textrel && !show_textrels) return NULL;
218 246
219 if (elf->phdr) { 247 if (elf->phdr) {
242 } 270 }
243 271
244 if (be_quiet || be_wewy_wewy_quiet) 272 if (be_quiet || be_wewy_wewy_quiet)
245 return NULL; 273 return NULL;
246 else 274 else
247 return (char *)" - "; 275 return " - ";
248} 276}
249static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel) 277static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
250{ 278{
251 unsigned long s, r, rmax; 279 unsigned long s, r, rmax;
252 void *symtab_void, *strtab_void, *text_void; 280 void *symtab_void, *strtab_void, *text_void;
305 if (be_verbose <= 2) continue; \ 333 if (be_verbose <= 2) continue; \
306 } else \ 334 } else \
307 *found_textrels = 1; \ 335 *found_textrels = 1; \
308 /* locate this relocation symbol name */ \ 336 /* locate this relocation symbol name */ \
309 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 337 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
338 if ((void*)sym > (void*)elf->data_end) { \
339 warn("%s: corrupt ELF symbol", elf->filename); \
340 continue; \
341 } \
310 sym_max = ELF ## B ## _R_SYM(r_info); \ 342 sym_max = ELF ## B ## _R_SYM(r_info); \
311 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \ 343 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
312 sym += sym_max; \ 344 sym += sym_max; \
313 else \ 345 else \
314 sym = NULL; \ 346 sym = NULL; \
315 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 347 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
316 /* show the raw details about this reloc */ \ 348 /* show the raw details about this reloc */ \
317 printf("\tTEXTREL %s: ", elf->base_filename); \ 349 printf(" %s: ", elf->base_filename); \
318 if (sym && sym->st_name) \ 350 if (sym && sym->st_name) \
319 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \ 351 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \
320 else \ 352 else \
321 printf("(NULL: fake?)"); \ 353 printf("(memory/fake?)"); \
322 printf(" [0x%lX]", (unsigned long)r_offset); \ 354 printf(" [0x%lX]", (unsigned long)r_offset); \
323 /* now try to find the closest symbol that this rel is probably in */ \ 355 /* now try to find the closest symbol that this rel is probably in */ \
324 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 356 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
325 func = NULL; \ 357 func = NULL; \
326 offset_tmp = 0; \ 358 offset_tmp = 0; \
346 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename); 378 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
347 379
348 return NULL; 380 return NULL;
349} 381}
350 382
351static void rpath_security_checks(elfobj *, char *); 383static void rpath_security_checks(elfobj *, char *, const char *);
352static void rpath_security_checks(elfobj *elf, char *item) { 384static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
385{
353 struct stat st; 386 struct stat st;
354 switch (*item) { 387 switch (*item) {
388 case '/': break;
355 case 0: 389 case '.':
356 warnf("Security problem NULL RPATH in %s", elf->filename); 390 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
357 break; 391 break;
358 case '/': break; 392 case ':':
393 case '\0':
394 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
395 break;
359 case '$': 396 case '$':
360 if (fstat(elf->fd, &st) != -1) 397 if (fstat(elf->fd, &st) != -1)
361 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID)) 398 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
362 warnf("Security problem with RPATH='%s' in %s with mode set of %o", 399 warnf("Security problem with %s='%s' in %s with mode set of %o",
363 item, elf->filename, st.st_mode & 07777); 400 dt_type, item, elf->filename, st.st_mode & 07777);
364 break; 401 break;
365 default: 402 default:
366 warnf("Maybe? sec problem with RPATH='%s' in %s", item, elf->filename); 403 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
367 break; 404 break;
368 } 405 }
369} 406}
370static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len) 407static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
371{ 408{
407 /* Verify the memory is somewhat sane */ \ 444 /* Verify the memory is somewhat sane */ \
408 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 445 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
409 if (offset < (Elf ## B ## _Off)elf->len) { \ 446 if (offset < (Elf ## B ## _Off)elf->len) { \
410 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \ 447 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
411 *r = (char*)(elf->data + offset); \ 448 *r = (char*)(elf->data + offset); \
449 /* cache the length in case we need to nuke this section later on */ \
450 if (fix_elf) \
451 offset = strlen(*r); \
412 /* If quiet, don't output paths in ld.so.conf */ \ 452 /* If quiet, don't output paths in ld.so.conf */ \
413 if (be_quiet) { \ 453 if (be_quiet) { \
414 size_t len; \ 454 size_t len; \
415 char *start, *end; \ 455 char *start, *end; \
416 /* note that we only 'chop' off leading known paths. */ \ 456 /* note that we only 'chop' off leading known paths. */ \
417 /* since *r is read-only memory, we can only move the ptr forward. */ \ 457 /* since *r is read-only memory, we can only move the ptr forward. */ \
418 start = *r; \ 458 start = *r; \
419 /* scan each path in : delimited list */ \ 459 /* scan each path in : delimited list */ \
420 while (start) { \ 460 while (start) { \
421 rpath_security_checks(elf, start); \ 461 rpath_security_checks(elf, start, get_elfdtype(word)); \
422 end = strchr(start, ':'); \ 462 end = strchr(start, ':'); \
423 len = (end ? abs(end - start) : strlen(start)); \ 463 len = (end ? abs(end - start) : strlen(start)); \
464 if (use_ldcache) \
424 for (s = 0; ldpaths[s]; ++s) { \ 465 for (s = 0; ldpaths[s]; ++s) \
425 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \ 466 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
426 *r = (end ? end + 1 : NULL); \ 467 *r = end; \
468 /* corner case ... if RPATH reads "/usr/lib:", we want \
469 * to show ':' rather than '' */ \
470 if (end && end[1] != '\0') \
471 (*r)++; \
427 break; \ 472 break; \
428 } \ 473 } \
429 } \
430 if (!*r || !ldpaths[s] || !end) \ 474 if (!*r || !end) \
431 start = NULL; \ 475 break; \
432 else \ 476 else \
433 start = start + len + 1; \ 477 start = start + len + 1; \
434 } \ 478 } \
435 } \ 479 } \
480 if (*r) { \
481 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
482 /* just nuke it */ \
483 nuke_it##B: \
484 memset(*r, 0x00, offset); \
485 *r = NULL; \
486 ESET(dyn->d_tag, DT_DEBUG); \
487 ESET(dyn->d_un.d_ptr, 0); \
488 } else if (fix_elf) { \
489 /* try to clean "bad" paths */ \
490 size_t len, tmpdir_len; \
491 char *start, *end; \
492 const char *tmpdir; \
493 start = *r; \
494 tmpdir = (getenv("TMPDIR") ? : "."); \
495 tmpdir_len = strlen(tmpdir); \
496 while (1) { \
497 end = strchr(start, ':'); \
498 if (start == end) { \
499 eat_this_path##B: \
500 len = strlen(end); \
501 memmove(start, end+1, len); \
502 start[len-1] = '\0'; \
503 end = start - 1; \
504 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
505 if (!end) { \
506 if (start == *r) \
507 goto nuke_it##B; \
508 *--start = '\0'; \
509 } else \
510 goto eat_this_path##B; \
511 } \
512 if (!end) \
513 break; \
514 start = end + 1; \
515 } \
516 if (**r == '\0') \
517 goto nuke_it##B; \
518 } \
519 if (*r) \
436 if (*r) *found_rpath = 1; \ 520 *found_rpath = 1; \
521 } \
437 } \ 522 } \
438 ++dyn; \ 523 ++dyn; \
439 } \ 524 } \
440 } } 525 } }
441 SHOW_RPATH(32) 526 SHOW_RPATH(32)
458 } else if (rpath || runpath) 543 } else if (rpath || runpath)
459 xstrcat(ret, (runpath ? runpath : rpath), ret_len); 544 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
460 else if (!be_quiet) 545 else if (!be_quiet)
461 xstrcat(ret, " - ", ret_len); 546 xstrcat(ret, " - ", ret_len);
462} 547}
548
549#define LDSO_CACHE_MAGIC "ld.so-"
550#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
551#define LDSO_CACHE_VER "1.7.0"
552#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
553#define FLAG_ANY -1
554#define FLAG_TYPE_MASK 0x00ff
555#define FLAG_LIBC4 0x0000
556#define FLAG_ELF 0x0001
557#define FLAG_ELF_LIBC5 0x0002
558#define FLAG_ELF_LIBC6 0x0003
559#define FLAG_REQUIRED_MASK 0xff00
560#define FLAG_SPARC_LIB64 0x0100
561#define FLAG_IA64_LIB64 0x0200
562#define FLAG_X8664_LIB64 0x0300
563#define FLAG_S390_LIB64 0x0400
564#define FLAG_POWERPC_LIB64 0x0500
565#define FLAG_MIPS64_LIBN32 0x0600
566#define FLAG_MIPS64_LIBN64 0x0700
567
568static char *lookup_cache_lib(elfobj *, char *);
569static char *lookup_cache_lib(elfobj *elf, char *fname)
570{
571 int fd = 0;
572 char *strs;
573 static char buf[__PAX_UTILS_PATH_MAX] = "";
574 const char *cachefile = "/etc/ld.so.cache";
575 struct stat st;
576
577 typedef struct {
578 char magic[LDSO_CACHE_MAGIC_LEN];
579 char version[LDSO_CACHE_VER_LEN];
580 int nlibs;
581 } header_t;
582 header_t *header;
583
584 typedef struct {
585 int flags;
586 int sooffset;
587 int liboffset;
588 } libentry_t;
589 libentry_t *libent;
590
591 if (fname == NULL)
592 return NULL;
593
594 if (ldcache == 0) {
595 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1)
596 return NULL;
597
598 /* cache these values so we only map/unmap the cache file once */
599 ldcache_size = st.st_size;
600 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
601
602 close(fd);
603
604 if (ldcache == (caddr_t)-1) {
605 ldcache = 0;
606 return NULL;
607 }
608
609 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
610 return NULL;
611 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
612 return NULL;
613 }
614
615 header = (header_t *) ldcache;
616 libent = (libentry_t *) (ldcache + sizeof(header_t));
617 strs = (char *) &libent[header->nlibs];
618
619 for (fd = 0; fd < header->nlibs; fd++) {
620 /* this should be more fine grained, but for now we assume that
621 * diff arches will not be cached together. and we ignore the
622 * the different multilib mips cases. */
623 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
624 continue;
625 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
626 continue;
627
628 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
629 continue;
630 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
631 }
632 return buf;
633}
634
635
463static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len) 636static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
464{ 637{
465 unsigned long i; 638 unsigned long i;
466 char *needed; 639 char *needed;
467 void *strtbl_void; 640 void *strtbl_void;
641 char *p;
468 642
469 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL; 643 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
470 644
471 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 645 strtbl_void = elf_findsecbyname(elf, ".dynstr");
472 646
492 } \ 666 } \
493 needed = (char*)(elf->data + offset); \ 667 needed = (char*)(elf->data + offset); \
494 if (op == 0) { \ 668 if (op == 0) { \
495 if (!be_wewy_wewy_quiet) { \ 669 if (!be_wewy_wewy_quiet) { \
496 if (*found_needed) xchrcat(ret, ',', ret_len); \ 670 if (*found_needed) xchrcat(ret, ',', ret_len); \
671 if (use_ldcache) \
672 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
673 needed = p; \
497 xstrcat(ret, needed, ret_len); \ 674 xstrcat(ret, needed, ret_len); \
498 } \ 675 } \
499 *found_needed = 1; \ 676 *found_needed = 1; \
500 } else { \ 677 } else { \
501 if (!strcmp(find_lib, needed)) { \ 678 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \
502 *found_lib = 1; \ 679 *found_lib = 1; \
503 return (be_wewy_wewy_quiet ? NULL : find_lib); \ 680 return (be_wewy_wewy_quiet ? NULL : needed); \
504 } \ 681 } \
505 } \ 682 } \
506 } \ 683 } \
507 ++dyn; \ 684 ++dyn; \
508 } \ 685 } \
625 return NULL; 802 return NULL;
626} 803}
627static char *scanelf_file_sym(elfobj *elf, char *found_sym) 804static char *scanelf_file_sym(elfobj *elf, char *found_sym)
628{ 805{
629 unsigned long i; 806 unsigned long i;
807 char *ret;
630 void *symtab_void, *strtab_void; 808 void *symtab_void, *strtab_void;
631 809
632 if (!find_sym) return NULL; 810 if (!find_sym) return NULL;
811 ret = find_sym;
633 812
634 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void); 813 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
635 814
636 if (symtab_void && strtab_void) { 815 if (symtab_void && strtab_void) {
637#define FIND_SYM(B) \ 816#define FIND_SYM(B) \
638 if (elf->elf_class == ELFCLASS ## B) { \ 817 if (elf->elf_class == ELFCLASS ## B) { \
639 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 818 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
640 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 819 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
641 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 820 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
642 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 821 unsigned long cnt = EGET(symtab->sh_entsize); \
643 char *symname; \ 822 char *symname; \
823 if (cnt) \
824 cnt = EGET(symtab->sh_size) / cnt; \
644 for (i = 0; i < cnt; ++i) { \ 825 for (i = 0; i < cnt; ++i) { \
645 if (sym->st_name) { \ 826 if (sym->st_name) { \
646 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 827 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
828 if ((void*)symname > (void*)elf->data_end) { \
829 warnf("%s: corrupt ELF symbols", elf->filename); \
830 continue; \
831 } \
647 if (*find_sym == '*') { \ 832 if (*find_sym == '*') { \
648 printf("%s(%s) %5lX %15s %s\n", \ 833 printf("%s(%s) %5lX %15s %s\n", \
649 ((*found_sym == 0) ? "\n\t" : "\t"), \ 834 ((*found_sym == 0) ? "\n\t" : "\t"), \
650 elf->base_filename, \ 835 elf->base_filename, \
651 (long)sym->st_size, \ 836 (unsigned long)sym->st_size, \
652 (char *)get_elfstttype(sym->st_info), \ 837 get_elfstttype(sym->st_info), \
653 symname); \ 838 symname); \
654 *found_sym = 1; \ 839 *found_sym = 1; \
655 } else if ((strcmp(find_sym, symname) == 0) || \ 840 } else { \
841 char *this_sym, *next_sym; \
842 this_sym = find_sym; \
843 do { \
844 next_sym = strchr(this_sym, ','); \
845 if (next_sym == NULL) \
846 next_sym = this_sym + strlen(this_sym); \
847 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
656 (strcmp(symname, versioned_symname) == 0)) \ 848 (strcmp(symname, versioned_symname) == 0)) { \
849 ret = this_sym; \
657 (*found_sym)++; \ 850 (*found_sym)++; \
851 goto break_out; \
852 } \
853 this_sym = next_sym + 1; \
854 } while (*next_sym != '\0'); \
855 } \
658 } \ 856 } \
659 ++sym; \ 857 ++sym; \
660 } } 858 } }
661 FIND_SYM(32) 859 FIND_SYM(32)
662 FIND_SYM(64) 860 FIND_SYM(64)
663 } 861 }
664 862
863break_out:
665 if (be_wewy_wewy_quiet) return NULL; 864 if (be_wewy_wewy_quiet) return NULL;
666 865
667 if (*find_sym != '*' && *found_sym) 866 if (*find_sym != '*' && *found_sym)
668 return find_sym; 867 return ret;
669 if (be_quiet) 868 if (be_quiet)
670 return NULL; 869 return NULL;
671 else 870 else
672 return (char *)" - "; 871 return (char *)" - ";
673} 872}
873
874
674/* scan an elf file and show all the fun stuff */ 875/* scan an elf file and show all the fun stuff */
675#define prints(str) write(fileno(stdout), str, strlen(str)) 876#define prints(str) write(fileno(stdout), str, strlen(str))
676static void scanelf_file(const char *filename) 877static int scanelf_elfobj(elfobj *elf)
677{ 878{
678 unsigned long i; 879 unsigned long i;
679 char found_pax, found_phdr, found_relro, found_load, found_textrel, 880 char found_pax, found_phdr, found_relro, found_load, found_textrel,
680 found_rpath, found_needed, found_interp, found_bind, found_soname, 881 found_rpath, found_needed, found_interp, found_bind, found_soname,
681 found_sym, found_lib, found_file, found_textrels; 882 found_sym, found_lib, found_file, found_textrels;
682 elfobj *elf;
683 struct stat st;
684 static char *out_buffer = NULL; 883 static char *out_buffer = NULL;
685 static size_t out_len; 884 static size_t out_len;
686
687 /* make sure 'filename' exists */
688 if (lstat(filename, &st) == -1) {
689 if (be_verbose > 2) printf("%s: does not exist\n", filename);
690 return;
691 }
692 /* always handle regular files and handle symlinked files if no -y */
693 if (S_ISLNK(st.st_mode)) {
694 if (!scan_symlink) return;
695 stat(filename, &st);
696 }
697 if (!S_ISREG(st.st_mode)) {
698 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
699 return;
700 }
701 885
702 found_pax = found_phdr = found_relro = found_load = found_textrel = \ 886 found_pax = found_phdr = found_relro = found_load = found_textrel = \
703 found_rpath = found_needed = found_interp = found_bind = found_soname = \ 887 found_rpath = found_needed = found_interp = found_bind = found_soname = \
704 found_sym = found_lib = found_file = found_textrels = 0; 888 found_sym = found_lib = found_file = found_textrels = 0;
705 889
706 /* verify this is real ELF */
707 if ((elf = readelf(filename)) == NULL) {
708 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
709 return;
710 }
711
712 if (be_verbose > 1) 890 if (be_verbose > 2)
713 printf("%s: scanning file {%s,%s}\n", filename, 891 printf("%s: scanning file {%s,%s}\n", elf->filename,
714 get_elfeitype(EI_CLASS, elf->elf_class), 892 get_elfeitype(EI_CLASS, elf->elf_class),
715 get_elfeitype(EI_DATA, elf->data[EI_DATA])); 893 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
716 else if (be_verbose) 894 else if (be_verbose > 1)
717 printf("%s: scanning file\n", filename); 895 printf("%s: scanning file\n", elf->filename);
718 896
719 /* init output buffer */ 897 /* init output buffer */
720 if (!out_buffer) { 898 if (!out_buffer) {
721 out_len = sizeof(char) * 80; 899 out_len = sizeof(char) * 80;
722 out_buffer = (char*)xmalloc(out_len); 900 out_buffer = (char*)xmalloc(out_len);
776 case '#': 954 case '#':
777 xchrcat(&out_buffer, out_format[i], &out_len); break; 955 xchrcat(&out_buffer, out_format[i], &out_len); break;
778 case 'F': 956 case 'F':
779 found_file = 1; 957 found_file = 1;
780 if (be_wewy_wewy_quiet) break; 958 if (be_wewy_wewy_quiet) break;
781 xstrcat(&out_buffer, filename, &out_len); 959 xstrcat(&out_buffer, elf->filename, &out_len);
782 break; 960 break;
783 case 'p': 961 case 'p':
784 found_file = 1; 962 found_file = 1;
785 if (be_wewy_wewy_quiet) break; 963 if (be_wewy_wewy_quiet) break;
786 tmp = filename; 964 tmp = elf->filename;
787 if (search_path) { 965 if (search_path) {
788 ssize_t len_search = strlen(search_path); 966 ssize_t len_search = strlen(search_path);
789 ssize_t len_file = strlen(filename); 967 ssize_t len_file = strlen(elf->filename);
790 if (!strncmp(filename, search_path, len_search) && \ 968 if (!strncmp(elf->filename, search_path, len_search) && \
791 len_file > len_search) 969 len_file > len_search)
792 tmp += len_search; 970 tmp += len_search;
793 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++; 971 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
794 } 972 }
795 xstrcat(&out_buffer, tmp, &out_len); 973 xstrcat(&out_buffer, tmp, &out_len);
796 break; 974 break;
797 case 'f': 975 case 'f':
798 found_file = 1; 976 found_file = 1;
799 if (be_wewy_wewy_quiet) break; 977 if (be_wewy_wewy_quiet) break;
800 tmp = strrchr(filename, '/'); 978 tmp = strrchr(elf->filename, '/');
801 tmp = (tmp == NULL ? filename : tmp+1); 979 tmp = (tmp == NULL ? elf->filename : tmp+1);
802 xstrcat(&out_buffer, tmp, &out_len); 980 xstrcat(&out_buffer, tmp, &out_len);
803 break; 981 break;
804 case 'o': out = get_elfetype(elf); break; 982 case 'o': out = get_elfetype(elf); break;
805 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 983 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
806 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break; 984 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
813 case 'b': out = scanelf_file_bind(elf, &found_bind); break; 991 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
814 case 'S': out = scanelf_file_soname(elf, &found_soname); break; 992 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
815 case 's': out = scanelf_file_sym(elf, &found_sym); break; 993 case 's': out = scanelf_file_sym(elf, &found_sym); break;
816 default: warnf("'%c' has no scan code?", out_format[i]); 994 default: warnf("'%c' has no scan code?", out_format[i]);
817 } 995 }
996 if (out) {
997 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
998 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
999 xstrncat(&out_buffer, out, &out_len, (tmp-out));
1000 else
818 if (out) xstrcat(&out_buffer, out, &out_len); 1001 xstrcat(&out_buffer, out, &out_len);
1002 }
819 } 1003 }
820 1004
821#define FOUND_SOMETHING() \ 1005#define FOUND_SOMETHING() \
822 (found_pax || found_phdr || found_relro || found_load || found_textrel || \ 1006 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
823 found_rpath || found_needed || found_interp || found_bind || \ 1007 found_rpath || found_needed || found_interp || found_bind || \
824 found_soname || found_sym || found_lib || found_textrels) 1008 found_soname || found_sym || found_lib || found_textrels)
825 1009
826 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) { 1010 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
827 xchrcat(&out_buffer, ' ', &out_len); 1011 xchrcat(&out_buffer, ' ', &out_len);
828 xstrcat(&out_buffer, filename, &out_len); 1012 xstrcat(&out_buffer, elf->filename, &out_len);
829 } 1013 }
830 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) { 1014 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
831 puts(out_buffer); 1015 puts(out_buffer);
832 fflush(stdout); 1016 fflush(stdout);
833 } 1017 }
834 1018
1019 return 0;
1020}
1021
1022/* scan a single elf */
1023static int scanelf_elf(const char *filename, int fd, size_t len)
1024{
1025 int ret;
1026 elfobj *elf;
1027
1028 /* verify this is real ELF */
1029 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1030 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1031 return 1;
1032 }
1033
1034 if (strlen(match_etypes)) {
1035 char sbuf[126];
1036 strncpy(sbuf, match_etypes, sizeof(sbuf));
1037 if (strchr(match_etypes, ',') != NULL) {
1038 char *p;
1039 while((p = strrchr(sbuf, ',')) != NULL) {
1040 *p = 0;
1041 if (atoi(p+1) == get_etype(elf))
1042 goto label_ret;
1043 }
1044 }
1045 if (atoi(sbuf) != get_etype(elf)) {
1046 ret = 1;
1047 goto label_done;
1048 }
1049 }
1050
1051label_ret:
1052 ret = scanelf_elfobj(elf);
1053
1054label_done:
835 unreadelf(elf); 1055 unreadelf(elf);
1056 return ret;
1057}
1058
1059/* scan an archive of elfs */
1060static int scanelf_archive(const char *filename, int fd, size_t len)
1061{
1062 archive_handle *ar;
1063 archive_member *m;
1064 char *ar_buffer;
1065 elfobj *elf;
1066
1067 ar = ar_open_fd(filename, fd);
1068 if (ar == NULL)
1069 return 1;
1070
1071 ar_buffer = (char*)mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1072 while ((m=ar_next(ar)) != NULL) {
1073 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size);
1074 if (elf) {
1075 scanelf_elfobj(elf);
1076 unreadelf(elf);
1077 }
1078 }
1079 munmap(ar_buffer, len);
1080
1081 return 0;
1082}
1083/* scan a file which may be an elf or an archive or some other magical beast */
1084static void scanelf_file(const char *filename)
1085{
1086 struct stat st;
1087 int fd;
1088
1089 /* make sure 'filename' exists */
1090 if (lstat(filename, &st) == -1) {
1091 if (be_verbose > 2) printf("%s: does not exist\n", filename);
1092 return;
1093 }
1094
1095 /* always handle regular files and handle symlinked files if no -y */
1096 if (S_ISLNK(st.st_mode)) {
1097 if (!scan_symlink) return;
1098 stat(filename, &st);
1099 }
1100 if (!S_ISREG(st.st_mode)) {
1101 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1102 return;
1103 }
1104
1105 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1106 return;
1107
1108 if (scanelf_elf(filename, fd, st.st_size) == 1 && scan_archives)
1109 /* if it isn't an ELF, maybe it's an .a archive */
1110 scanelf_archive(filename, fd, st.st_size);
1111
1112 close(fd);
836} 1113}
837 1114
838/* scan a directory for ET_EXEC files and print when we find one */ 1115/* scan a directory for ET_EXEC files and print when we find one */
839static void scanelf_dir(const char *path) 1116static void scanelf_dir(const char *path)
840{ 1117{
841 register DIR *dir; 1118 register DIR *dir;
842 register struct dirent *dentry; 1119 register struct dirent *dentry;
843 struct stat st_top, st; 1120 struct stat st_top, st;
844 char buf[_POSIX_PATH_MAX]; 1121 char buf[__PAX_UTILS_PATH_MAX];
845 size_t pathlen = 0, len = 0; 1122 size_t pathlen = 0, len = 0;
846 1123
847 /* make sure path exists */ 1124 /* make sure path exists */
848 if (lstat(path, &st_top) == -1) { 1125 if (lstat(path, &st_top) == -1) {
849 if (be_verbose > 2) printf("%s: does not exist\n", path); 1126 if (be_verbose > 2) printf("%s: does not exist\n", path);
859 /* now scan the dir looking for fun stuff */ 1136 /* now scan the dir looking for fun stuff */
860 if ((dir = opendir(path)) == NULL) { 1137 if ((dir = opendir(path)) == NULL) {
861 warnf("could not opendir %s: %s", path, strerror(errno)); 1138 warnf("could not opendir %s: %s", path, strerror(errno));
862 return; 1139 return;
863 } 1140 }
864 if (be_verbose) printf("%s: scanning dir\n", path); 1141 if (be_verbose > 1) printf("%s: scanning dir\n", path);
865 1142
866 pathlen = strlen(path); 1143 pathlen = strlen(path);
867 while ((dentry = readdir(dir))) { 1144 while ((dentry = readdir(dir))) {
868 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1145 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
869 continue; 1146 continue;
888 1165
889static int scanelf_from_file(char *filename) 1166static int scanelf_from_file(char *filename)
890{ 1167{
891 FILE *fp = NULL; 1168 FILE *fp = NULL;
892 char *p; 1169 char *p;
893 char path[_POSIX_PATH_MAX]; 1170 char path[__PAX_UTILS_PATH_MAX];
894 1171
895 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL)) 1172 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL))
896 fp = stdin; 1173 fp = stdin;
897 else if ((fp = fopen(filename, "r")) == NULL) 1174 else if ((fp = fopen(filename, "r")) == NULL)
898 return 1; 1175 return 1;
899 1176
900 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1177 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
901 if ((p = strchr(path, '\n')) != NULL) 1178 if ((p = strchr(path, '\n')) != NULL)
902 *p = 0; 1179 *p = 0;
903 search_path = path; 1180 search_path = path;
904 scanelf_dir(path); 1181 scanelf_dir(path);
905 } 1182 }
910 1187
911static void load_ld_so_conf() 1188static void load_ld_so_conf()
912{ 1189{
913 FILE *fp = NULL; 1190 FILE *fp = NULL;
914 char *p; 1191 char *p;
915 char path[_POSIX_PATH_MAX]; 1192 char path[__PAX_UTILS_PATH_MAX];
916 int i = 0; 1193 int i = 0;
917 1194
918 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1195 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL)
919 return; 1196 return;
920 1197
921 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1198 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
922 if (*path != '/') 1199 if (*path != '/')
923 continue; 1200 continue;
924 1201
925 if ((p = strrchr(path, '\r')) != NULL) 1202 if ((p = strrchr(path, '\r')) != NULL)
926 *p = 0; 1203 *p = 0;
978 1255
979 free(path); 1256 free(path);
980} 1257}
981 1258
982 1259
983
984/* usage / invocation handling functions */ 1260/* usage / invocation handling functions */
985#define PARSE_FLAGS "plRmyxetrnibSs:N:TaqvF:f:o:BhV" 1261#define PARSE_FLAGS "plRmyAXxetrnLibSs:gN:TaqvF:f:o:E:BhV"
986#define a_argument required_argument 1262#define a_argument required_argument
987static struct option const long_opts[] = { 1263static struct option const long_opts[] = {
988 {"path", no_argument, NULL, 'p'}, 1264 {"path", no_argument, NULL, 'p'},
989 {"ldpath", no_argument, NULL, 'l'}, 1265 {"ldpath", no_argument, NULL, 'l'},
990 {"recursive", no_argument, NULL, 'R'}, 1266 {"recursive", no_argument, NULL, 'R'},
991 {"mount", no_argument, NULL, 'm'}, 1267 {"mount", no_argument, NULL, 'm'},
992 {"symlink", no_argument, NULL, 'y'}, 1268 {"symlink", no_argument, NULL, 'y'},
1269 {"archives", no_argument, NULL, 'A'},
1270 {"ldcache", no_argument, NULL, 'L'},
1271 {"fix", no_argument, NULL, 'X'},
993 {"pax", no_argument, NULL, 'x'}, 1272 {"pax", no_argument, NULL, 'x'},
994 {"header", no_argument, NULL, 'e'}, 1273 {"header", no_argument, NULL, 'e'},
995 {"textrel", no_argument, NULL, 't'}, 1274 {"textrel", no_argument, NULL, 't'},
996 {"rpath", no_argument, NULL, 'r'}, 1275 {"rpath", no_argument, NULL, 'r'},
997 {"needed", no_argument, NULL, 'n'}, 1276 {"needed", no_argument, NULL, 'n'},
998 {"interp", no_argument, NULL, 'i'}, 1277 {"interp", no_argument, NULL, 'i'},
999 {"bind", no_argument, NULL, 'b'}, 1278 {"bind", no_argument, NULL, 'b'},
1000 {"soname", no_argument, NULL, 'S'}, 1279 {"soname", no_argument, NULL, 'S'},
1001 {"symbol", a_argument, NULL, 's'}, 1280 {"symbol", a_argument, NULL, 's'},
1002 {"lib", a_argument, NULL, 'N'}, 1281 {"lib", a_argument, NULL, 'N'},
1282 {"gmatch", no_argument, NULL, 'g'},
1003 {"textrels", no_argument, NULL, 'T'}, 1283 {"textrels", no_argument, NULL, 'T'},
1284 {"etype", a_argument, NULL, 'E'},
1004 {"all", no_argument, NULL, 'a'}, 1285 {"all", no_argument, NULL, 'a'},
1005 {"quiet", no_argument, NULL, 'q'}, 1286 {"quiet", no_argument, NULL, 'q'},
1006 {"verbose", no_argument, NULL, 'v'}, 1287 {"verbose", no_argument, NULL, 'v'},
1007 {"format", a_argument, NULL, 'F'}, 1288 {"format", a_argument, NULL, 'F'},
1008 {"from", a_argument, NULL, 'f'}, 1289 {"from", a_argument, NULL, 'f'},
1016static const char *opts_help[] = { 1297static const char *opts_help[] = {
1017 "Scan all directories in PATH environment", 1298 "Scan all directories in PATH environment",
1018 "Scan all directories in /etc/ld.so.conf", 1299 "Scan all directories in /etc/ld.so.conf",
1019 "Scan directories recursively", 1300 "Scan directories recursively",
1020 "Don't recursively cross mount points", 1301 "Don't recursively cross mount points",
1021 "Don't scan symlinks\n", 1302 "Don't scan symlinks",
1303 "Scan archives (.a files)",
1304 "Utilize ld.so.cache information (use with -r/-n)",
1305 "Try and 'fix' bad things (use with -r/-e)\n",
1022 "Print PaX markings", 1306 "Print PaX markings",
1023 "Print GNU_STACK/PT_LOAD markings", 1307 "Print GNU_STACK/PT_LOAD markings",
1024 "Print TEXTREL information", 1308 "Print TEXTREL information",
1025 "Print RPATH information", 1309 "Print RPATH information",
1026 "Print NEEDED information", 1310 "Print NEEDED information",
1027 "Print INTERP information", 1311 "Print INTERP information",
1028 "Print BIND information", 1312 "Print BIND information",
1029 "Print SONAME information", 1313 "Print SONAME information",
1030 "Find a specified symbol", 1314 "Find a specified symbol",
1031 "Find a specified library", 1315 "Find a specified library",
1316 "Use strncmp to match libraries. (use with -N)",
1032 "Locate cause of TEXTREL", 1317 "Locate cause of TEXTREL",
1318 "Print only ELF files matching numeric constant",
1033 "Print all scanned info (-x -e -t -r -b)\n", 1319 "Print all scanned info (-x -e -t -r -b)\n",
1034 "Only output 'bad' things", 1320 "Only output 'bad' things",
1035 "Be verbose (can be specified more than once)", 1321 "Be verbose (can be specified more than once)",
1036 "Use specified format for output", 1322 "Use specified format for output",
1037 "Read input stream from a filename", 1323 "Read input stream from a filename",
1045/* display usage and exit */ 1331/* display usage and exit */
1046static void usage(int status) 1332static void usage(int status)
1047{ 1333{
1048 unsigned long i; 1334 unsigned long i;
1049 printf("* Scan ELF binaries for stuff\n\n" 1335 printf("* Scan ELF binaries for stuff\n\n"
1050 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0); 1336 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1051 printf("Options: -[%s]\n", PARSE_FLAGS); 1337 printf("Options: -[%s]\n", PARSE_FLAGS);
1052 for (i = 0; long_opts[i].name; ++i) 1338 for (i = 0; long_opts[i].name; ++i)
1053 if (long_opts[i].has_arg == no_argument) 1339 if (long_opts[i].has_arg == no_argument)
1054 printf(" -%c, --%-13s* %s\n", long_opts[i].val, 1340 printf(" -%c, --%-13s* %s\n", long_opts[i].val,
1055 long_opts[i].name, opts_help[i]); 1341 long_opts[i].name, opts_help[i]);
1063 puts("\nThe format modifiers for the -F option are:"); 1349 puts("\nThe format modifiers for the -F option are:");
1064 puts(" F Filename \tx PaX Flags \te STACK/RELRO"); 1350 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1065 puts(" t TEXTREL \tr RPATH \tn NEEDED"); 1351 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1066 puts(" i INTERP \tb BIND \ts symbol"); 1352 puts(" i INTERP \tb BIND \ts symbol");
1067 puts(" N library \to Type \tT TEXTRELs"); 1353 puts(" N library \to Type \tT TEXTRELs");
1354 puts(" S SONAME");
1068 puts(" p filename (with search path removed)"); 1355 puts(" p filename (with search path removed)");
1069 puts(" f base filename"); 1356 puts(" f filename (short name/basename)");
1070 puts("Prefix each modifier with '%' (verbose) or '#' (silent)"); 1357 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1071 1358
1072 exit(status); 1359 exit(status);
1073} 1360}
1074 1361
1088 VERSION, __FILE__, __DATE__, rcsid, argv0); 1375 VERSION, __FILE__, __DATE__, rcsid, argv0);
1089 exit(EXIT_SUCCESS); 1376 exit(EXIT_SUCCESS);
1090 break; 1377 break;
1091 case 'h': usage(EXIT_SUCCESS); break; 1378 case 'h': usage(EXIT_SUCCESS); break;
1092 case 'f': 1379 case 'f':
1093 if (from_file) err("Don't specify -f twice"); 1380 if (from_file) warn("You prob don't want to specify -f twice");
1094 from_file = xstrdup(optarg); 1381 from_file = optarg;
1382 break;
1383 case 'E':
1384 strncpy(match_etypes, optarg, sizeof(match_etypes));
1095 break; 1385 break;
1096 case 'o': { 1386 case 'o': {
1097 FILE *fp = NULL; 1387 FILE *fp = NULL;
1098 if ((fp = freopen(optarg, "w", stdout)) == NULL) 1388 if ((fp = freopen(optarg, "w", stdout)) == NULL)
1099 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 1389 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1100 SET_STDOUT(fp); 1390 SET_STDOUT(fp);
1101 break; 1391 break;
1102 } 1392 }
1103 1393
1104 case 's': { 1394 case 's': {
1105 size_t len;
1106 if (find_sym) err("Don't specify -s twice"); 1395 if (find_sym) warn("You prob don't want to specify -s twice");
1107 find_sym = xstrdup(optarg); 1396 find_sym = optarg;
1108 len = strlen(find_sym) + 1;
1109 versioned_symname = (char*)xmalloc(sizeof(char) * (len+1)); 1397 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1110 sprintf(versioned_symname, "%s@", find_sym); 1398 sprintf(versioned_symname, "%s@", find_sym);
1111 break; 1399 break;
1112 } 1400 }
1113 case 'N': { 1401 case 'N': {
1114 if (find_lib) err("Don't specify -N twice"); 1402 if (find_lib) warn("You prob don't want to specify -N twice");
1115 find_lib = xstrdup(optarg); 1403 find_lib = optarg;
1116 break; 1404 break;
1117 } 1405 }
1118 1406
1119 case 'F': { 1407 case 'F': {
1120 if (out_format) err("Don't specify -F twice"); 1408 if (out_format) warn("You prob don't want to specify -F twice");
1121 out_format = xstrdup(optarg); 1409 out_format = optarg;
1122 break; 1410 break;
1123 } 1411 }
1124 1412
1413 case 'g': gmatch = 1; /* break; any reason we dont breal; here ? */
1414 case 'L': use_ldcache = 1; break;
1125 case 'y': scan_symlink = 0; break; 1415 case 'y': scan_symlink = 0; break;
1416 case 'A': scan_archives = 1; break;
1126 case 'B': show_banner = 0; break; 1417 case 'B': show_banner = 0; break;
1127 case 'l': scan_ldpath = 1; break; 1418 case 'l': scan_ldpath = 1; break;
1128 case 'p': scan_envpath = 1; break; 1419 case 'p': scan_envpath = 1; break;
1129 case 'R': dir_recurse = 1; break; 1420 case 'R': dir_recurse = 1; break;
1130 case 'm': dir_crossmount = 0; break; 1421 case 'm': dir_crossmount = 0; break;
1422 case 'X': ++fix_elf; break;
1131 case 'x': show_pax = 1; break; 1423 case 'x': show_pax = 1; break;
1132 case 'e': show_phdr = 1; break; 1424 case 'e': show_phdr = 1; break;
1133 case 't': show_textrel = 1; break; 1425 case 't': show_textrel = 1; break;
1134 case 'r': show_rpath = 1; break; 1426 case 'r': show_rpath = 1; break;
1135 case 'n': show_needed = 1; break; 1427 case 'n': show_needed = 1; break;
1140 case 'q': be_quiet = 1; break; 1432 case 'q': be_quiet = 1; break;
1141 case 'v': be_verbose = (be_verbose % 20) + 1; break; 1433 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1142 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break; 1434 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
1143 1435
1144 case ':': 1436 case ':':
1145 err("Option missing parameter\n"); 1437 err("Option '%c' is missing parameter", optopt);
1146 case '?': 1438 case '?':
1147 err("Unknown option\n"); 1439 err("Unknown option '%c' or argument missing", optopt);
1148 default: 1440 default:
1149 err("Unhandled option '%c'", i); 1441 err("Unhandled option '%c'; please report this", i);
1150 } 1442 }
1151 } 1443 }
1152 1444
1153 /* let the format option override all other options */ 1445 /* let the format option override all other options */
1154 if (out_format) { 1446 if (out_format) {
1201 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 1493 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1202 } 1494 }
1203 if (be_verbose > 2) printf("Format: %s\n", out_format); 1495 if (be_verbose > 2) printf("Format: %s\n", out_format);
1204 1496
1205 /* now lets actually do the scanning */ 1497 /* now lets actually do the scanning */
1206 if (scan_ldpath || (show_rpath && be_quiet)) 1498 if (scan_ldpath || use_ldcache)
1207 load_ld_so_conf(); 1499 load_ld_so_conf();
1208 if (scan_ldpath) scanelf_ldpath(); 1500 if (scan_ldpath) scanelf_ldpath();
1209 if (scan_envpath) scanelf_envpath(); 1501 if (scan_envpath) scanelf_envpath();
1210 if (from_file) { 1502 if (from_file) {
1211 scanelf_from_file(from_file); 1503 scanelf_from_file(from_file);
1212 free(from_file);
1213 from_file = *argv; 1504 from_file = *argv;
1214 } 1505 }
1215 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file) 1506 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1216 err("Nothing to scan !?"); 1507 err("Nothing to scan !?");
1217 while (optind < argc) { 1508 while (optind < argc) {
1218 search_path = argv[optind++]; 1509 search_path = argv[optind++];
1219 scanelf_dir(search_path); 1510 scanelf_dir(search_path);
1220 } 1511 }
1221 1512
1222 /* clean up */ 1513 /* clean up */
1223 if (find_sym) { 1514 if (versioned_symname) free(versioned_symname);
1224 free(find_sym);
1225 free(versioned_symname);
1226 }
1227 if (find_lib) free(find_lib);
1228 if (out_format) free(out_format);
1229 for (i = 0; ldpaths[i]; ++i) 1515 for (i = 0; ldpaths[i]; ++i)
1230 free(ldpaths[i]); 1516 free(ldpaths[i]);
1517
1518 if (ldcache != 0)
1519 munmap(ldcache, ldcache_size);
1231} 1520}
1232 1521
1233 1522
1234 1523
1235/* utility funcs */ 1524/* utility funcs */
1237{ 1526{
1238 char *ret = strdup(s); 1527 char *ret = strdup(s);
1239 if (!ret) err("Could not strdup(): %s", strerror(errno)); 1528 if (!ret) err("Could not strdup(): %s", strerror(errno));
1240 return ret; 1529 return ret;
1241} 1530}
1242
1243static void *xmalloc(size_t size) 1531static void *xmalloc(size_t size)
1244{ 1532{
1245 void *ret = malloc(size); 1533 void *ret = malloc(size);
1246 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size); 1534 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1247 return ret; 1535 return ret;
1248} 1536}
1249
1250static void xstrcat(char **dst, const char *src, size_t *curr_len) 1537static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
1251{ 1538{
1252 size_t new_len; 1539 size_t new_len;
1253 1540
1254 new_len = strlen(*dst) + strlen(src); 1541 new_len = strlen(*dst) + strlen(src);
1255 if (*curr_len <= new_len) { 1542 if (*curr_len <= new_len) {
1256 *curr_len = new_len + (*curr_len / 2); 1543 *curr_len = new_len + (*curr_len / 2);
1257 *dst = realloc(*dst, *curr_len); 1544 *dst = realloc(*dst, *curr_len);
1258 if (!*dst) 1545 if (!*dst)
1259 err("could not realloc %li bytes", (unsigned long)*curr_len); 1546 err("could not realloc() %li bytes", (unsigned long)*curr_len);
1260 } 1547 }
1261 1548
1549 if (n)
1550 strncat(*dst, src, n);
1551 else
1262 strcat(*dst, src); 1552 strcat(*dst, src);
1263} 1553}
1264
1265static inline void xchrcat(char **dst, const char append, size_t *curr_len) 1554static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1266{ 1555{
1267 static char my_app[2]; 1556 static char my_app[2];
1268 my_app[0] = append; 1557 my_app[0] = append;
1269 my_app[1] = '\0'; 1558 my_app[1] = '\0';

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