/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.93 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 1.93 2005/12/10 04:07:55 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 * Copyright 2003-2005 Ned Ludd - <solar@gentoo.org> 6 * Copyright 2003-2006 Ned Ludd - <solar@gentoo.org>
7 * Copyright 2004-2005 Mike Frysinger - <vapier@gentoo.org> 7 * Copyright 2004-2006 Mike Frysinger - <vapier@gentoo.org>
8 */ 8 */
9 9
10#include <stdio.h>
11#include <stdlib.h>
12#include <sys/types.h>
13#include <libgen.h>
14#include <limits.h>
15#include <string.h>
16#include <errno.h>
17#include <unistd.h>
18#include <sys/stat.h>
19#include <dirent.h>
20#include <getopt.h>
21#include <assert.h>
22#include "paxinc.h" 10#include "paxinc.h"
23 11
24static const char *rcsid = "$Id: scanelf.c,v 1.93 2005/12/10 04:07:55 vapier Exp $"; 12static const char *rcsid = "$Id: scanelf.c,v 1.119 2006/02/05 02:25:58 solar Exp $";
25#define argv0 "scanelf" 13#define argv0 "scanelf"
26 14
27#define IS_MODIFIER(c) (c == '%' || c == '#') 15#define IS_MODIFIER(c) (c == '%' || c == '#')
28 16
29 17
30 18
31/* 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);
32static void scanelf_file(const char *filename); 23static void scanelf_file(const char *filename);
33static void scanelf_dir(const char *path); 24static void scanelf_dir(const char *path);
34static void scanelf_ldpath(); 25static void scanelf_ldpath(void);
35static void scanelf_envpath(); 26static void scanelf_envpath(void);
36static void usage(int status); 27static void usage(int status);
37static void parseargs(int argc, char *argv[]); 28static void parseargs(int argc, char *argv[]);
38static char *xstrdup(const char *s); 29static char *xstrdup(const char *s);
39static void *xmalloc(size_t size); 30static void *xmalloc(size_t size);
40static 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)
41static 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);
42 34
43/* variables to control behavior */ 35/* variables to control behavior */
36static char match_etypes[126] = "";
44static char *ldpaths[256]; 37static char *ldpaths[256];
45static char scan_ldpath = 0; 38static char scan_ldpath = 0;
46static char scan_envpath = 0; 39static char scan_envpath = 0;
47static char scan_symlink = 1; 40static char scan_symlink = 1;
41static char scan_archives = 0;
48static char dir_recurse = 0; 42static char dir_recurse = 0;
49static char dir_crossmount = 1; 43static char dir_crossmount = 1;
50static char show_pax = 0; 44static char show_pax = 0;
51static char show_phdr = 0; 45static char show_phdr = 0;
52static char show_textrel = 0; 46static char show_textrel = 0;
62static char be_wewy_wewy_quiet = 0; 56static char be_wewy_wewy_quiet = 0;
63static char *find_sym = NULL, *versioned_symname = NULL; 57static char *find_sym = NULL, *versioned_symname = NULL;
64static char *find_lib = NULL; 58static char *find_lib = NULL;
65static char *out_format = NULL; 59static char *out_format = NULL;
66static char *search_path = NULL; 60static char *search_path = NULL;
61static char fix_elf = 0;
67static char gmatch = 0; 62static char gmatch = 0;
63static char use_ldcache = 0;
68 64
65
66caddr_t ldcache = 0;
67size_t ldcache_size = 0;
69 68
70/* sub-funcs for scanelf_file() */ 69/* sub-funcs for scanelf_file() */
71static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab) 70static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
72{ 71{
73 /* find the best SHT_DYNSYM and SHT_STRTAB sections */ 72 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
143 142
144static 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)
145{ 144{
146 static char ret[12]; 145 static char ret[12];
147 char *found; 146 char *found;
148 unsigned long i, shown;
149 unsigned char multi_stack, multi_relro, multi_load; 147 unsigned long i, shown, multi_stack, multi_relro, multi_load;
148 int max_pt_load;
150 149
151 if (!show_phdr) return NULL; 150 if (!show_phdr) return NULL;
152 151
153 memcpy(ret, "--- --- ---\0", 12); 152 memcpy(ret, "--- --- ---\0", 12);
154 153
155 shown = 0; 154 shown = 0;
156 multi_stack = multi_relro = multi_load = 0; 155 multi_stack = multi_relro = multi_load = 0;
156 max_pt_load = elf_max_pt_load(elf);
157 157
158#define NOTE_GNU_STACK ".note.GNU-stack"
158#define SHOW_PHDR(B) \ 159#define SHOW_PHDR(B) \
159 if (elf->elf_class == ELFCLASS ## B) { \ 160 if (elf->elf_class == ELFCLASS ## B) { \
160 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 161 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
161 Elf ## B ## _Off offset; \ 162 Elf ## B ## _Off offset; \
162 uint32_t flags, check_flags; \ 163 uint32_t flags, check_flags; \
172 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); \
173 found = found_relro; \ 174 found = found_relro; \
174 offset = 4; \ 175 offset = 4; \
175 check_flags = PF_X; \ 176 check_flags = PF_X; \
176 } 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) \
177 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); \
178 found = found_load; \ 180 found = found_load; \
179 offset = 8; \ 181 offset = 8; \
180 check_flags = PF_W|PF_X; \ 182 check_flags = PF_W|PF_X; \
181 } else \ 183 } else \
182 continue; \ 184 continue; \
183 flags = EGET(phdr[i].p_flags); \ 185 flags = EGET(phdr[i].p_flags); \
184 if (be_quiet && ((flags & check_flags) != check_flags)) \ 186 if (be_quiet && ((flags & check_flags) != check_flags)) \
185 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 } \
186 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \ 193 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
187 *found = 1; \ 194 *found = 1; \
188 ++shown; \ 195 ++shown; \
189 } \ 196 } \
190 } else if (elf->shdr != NULL) { \ 197 } else if (elf->shdr != NULL) { \
191 /* no program headers which means this is prob an object file */ \ 198 /* no program headers which means this is prob an object file */ \
192 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \ 199 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
193 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \ 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; \
194 check_flags = SHF_WRITE|SHF_EXECINSTR; \ 204 check_flags = SHF_WRITE|SHF_EXECINSTR; \
195 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \ 205 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
196 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \ 206 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
197 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \ 207 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
198 if (!strcmp((char*)(elf->data + offset), ".note.GNU-stack")) { \ 208 str = elf->data + offset; \
209 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
210 if (!strcmp(str, NOTE_GNU_STACK)) { \
199 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \ 211 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
200 flags = EGET(shdr[i].sh_flags); \ 212 flags = EGET(shdr[i].sh_flags); \
201 if (be_quiet && ((flags & check_flags) != check_flags)) \ 213 if (be_quiet && ((flags & check_flags) != check_flags)) \
202 continue; \ 214 continue; \
203 ++*found_phdr; \ 215 ++*found_phdr; \
207 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \ 219 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
208 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \ 220 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
209 break; \ 221 break; \
210 } \ 222 } \
211 } \ 223 } \
224 skip_this_shdr##B: \
212 if (!multi_stack) { \ 225 if (!multi_stack) { \
213 *found_phdr = 1; \ 226 *found_phdr = 1; \
214 shown = 1; \ 227 shown = 1; \
215 memcpy(ret, "!WX", 3); \ 228 memcpy(ret, "!WX", 3); \
216 } \ 229 } \
320 if (be_verbose <= 2) continue; \ 333 if (be_verbose <= 2) continue; \
321 } else \ 334 } else \
322 *found_textrels = 1; \ 335 *found_textrels = 1; \
323 /* locate this relocation symbol name */ \ 336 /* locate this relocation symbol name */ \
324 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 } \
325 sym_max = ELF ## B ## _R_SYM(r_info); \ 342 sym_max = ELF ## B ## _R_SYM(r_info); \
326 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \ 343 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
327 sym += sym_max; \ 344 sym += sym_max; \
328 else \ 345 else \
329 sym = NULL; \ 346 sym = NULL; \
361 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);
362 379
363 return NULL; 380 return NULL;
364} 381}
365 382
366static void rpath_security_checks(elfobj *, char *); 383static void rpath_security_checks(elfobj *, char *, const char *);
367static void rpath_security_checks(elfobj *elf, char *item) { 384static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
385{
368 struct stat st; 386 struct stat st;
369 switch (*item) { 387 switch (*item) {
370 case '/': break; 388 case '/': break;
371 case '.': 389 case '.':
372 warnf("Security problem with relative RPATH '%s' in %s", item, elf->filename); 390 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
373 break; 391 break;
392 case ':':
374 case '\0': 393 case '\0':
375 warnf("Security problem NULL RPATH in %s", elf->filename); 394 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
376 break; 395 break;
377 case '$': 396 case '$':
378 if (fstat(elf->fd, &st) != -1) 397 if (fstat(elf->fd, &st) != -1)
379 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID)) 398 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
380 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",
381 item, elf->filename, st.st_mode & 07777); 400 dt_type, item, elf->filename, st.st_mode & 07777);
382 break; 401 break;
383 default: 402 default:
384 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);
385 break; 404 break;
386 } 405 }
387} 406}
388static 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)
389{ 408{
425 /* Verify the memory is somewhat sane */ \ 444 /* Verify the memory is somewhat sane */ \
426 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 445 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
427 if (offset < (Elf ## B ## _Off)elf->len) { \ 446 if (offset < (Elf ## B ## _Off)elf->len) { \
428 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \ 447 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
429 *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); \
430 /* If quiet, don't output paths in ld.so.conf */ \ 452 /* If quiet, don't output paths in ld.so.conf */ \
431 if (be_quiet) { \ 453 if (be_quiet) { \
432 size_t len; \ 454 size_t len; \
433 char *start, *end; \ 455 char *start, *end; \
434 /* note that we only 'chop' off leading known paths. */ \ 456 /* note that we only 'chop' off leading known paths. */ \
435 /* 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. */ \
436 start = *r; \ 458 start = *r; \
437 /* scan each path in : delimited list */ \ 459 /* scan each path in : delimited list */ \
438 while (start) { \ 460 while (start) { \
439 rpath_security_checks(elf, start); \ 461 rpath_security_checks(elf, start, get_elfdtype(word)); \
440 end = strchr(start, ':'); \ 462 end = strchr(start, ':'); \
441 len = (end ? abs(end - start) : strlen(start)); \ 463 len = (end ? abs(end - start) : strlen(start)); \
464 if (use_ldcache) \
442 for (s = 0; ldpaths[s]; ++s) { \ 465 for (s = 0; ldpaths[s]; ++s) \
443 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \ 466 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
444 *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)++; \
445 break; \ 472 break; \
446 } \ 473 } \
447 } \
448 if (!*r || !ldpaths[s] || !end) \ 474 if (!*r || !end) \
449 start = NULL; \ 475 break; \
450 else \ 476 else \
451 start = start + len + 1; \ 477 start = start + len + 1; \
452 } \ 478 } \
453 } \ 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) \
454 if (*r) *found_rpath = 1; \ 520 *found_rpath = 1; \
521 } \
455 } \ 522 } \
456 ++dyn; \ 523 ++dyn; \
457 } \ 524 } \
458 } } 525 } }
459 SHOW_RPATH(32) 526 SHOW_RPATH(32)
476 } else if (rpath || runpath) 543 } else if (rpath || runpath)
477 xstrcat(ret, (runpath ? runpath : rpath), ret_len); 544 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
478 else if (!be_quiet) 545 else if (!be_quiet)
479 xstrcat(ret, " - ", ret_len); 546 xstrcat(ret, " - ", ret_len);
480} 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
481static 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)
482{ 637{
483 unsigned long i; 638 unsigned long i;
484 char *needed; 639 char *needed;
485 void *strtbl_void; 640 void *strtbl_void;
641 char *p;
486 642
487 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL; 643 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
488 644
489 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 645 strtbl_void = elf_findsecbyname(elf, ".dynstr");
490 646
510 } \ 666 } \
511 needed = (char*)(elf->data + offset); \ 667 needed = (char*)(elf->data + offset); \
512 if (op == 0) { \ 668 if (op == 0) { \
513 if (!be_wewy_wewy_quiet) { \ 669 if (!be_wewy_wewy_quiet) { \
514 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; \
515 xstrcat(ret, needed, ret_len); \ 674 xstrcat(ret, needed, ret_len); \
516 } \ 675 } \
517 *found_needed = 1; \ 676 *found_needed = 1; \
518 } else { \ 677 } else { \
519 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \ 678 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \
643 return NULL; 802 return NULL;
644} 803}
645static char *scanelf_file_sym(elfobj *elf, char *found_sym) 804static char *scanelf_file_sym(elfobj *elf, char *found_sym)
646{ 805{
647 unsigned long i; 806 unsigned long i;
807 char *ret;
648 void *symtab_void, *strtab_void; 808 void *symtab_void, *strtab_void;
649 809
650 if (!find_sym) return NULL; 810 if (!find_sym) return NULL;
811 ret = find_sym;
651 812
652 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void); 813 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
653 814
654 if (symtab_void && strtab_void) { 815 if (symtab_void && strtab_void) {
655#define FIND_SYM(B) \ 816#define FIND_SYM(B) \
656 if (elf->elf_class == ELFCLASS ## B) { \ 817 if (elf->elf_class == ELFCLASS ## B) { \
657 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 818 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
658 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 819 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
659 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)); \
660 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 821 unsigned long cnt = EGET(symtab->sh_entsize); \
661 char *symname; \ 822 char *symname; \
823 if (cnt) \
824 cnt = EGET(symtab->sh_size) / cnt; \
662 for (i = 0; i < cnt; ++i) { \ 825 for (i = 0; i < cnt; ++i) { \
663 if (sym->st_name) { \ 826 if (sym->st_name) { \
664 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 } \
665 if (*find_sym == '*') { \ 832 if (*find_sym == '*') { \
666 printf("%s(%s) %5lX %15s %s\n", \ 833 printf("%s(%s) %5lX %15s %s\n", \
667 ((*found_sym == 0) ? "\n\t" : "\t"), \ 834 ((*found_sym == 0) ? "\n\t" : "\t"), \
668 elf->base_filename, \ 835 elf->base_filename, \
669 (long)sym->st_size, \ 836 (unsigned long)sym->st_size, \
670 (char *)get_elfstttype(sym->st_info), \ 837 get_elfstttype(sym->st_info), \
671 symname); \ 838 symname); \
672 *found_sym = 1; \ 839 *found_sym = 1; \
673 } 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') || \
674 (strcmp(symname, versioned_symname) == 0)) \ 848 (strcmp(symname, versioned_symname) == 0)) { \
849 ret = this_sym; \
675 (*found_sym)++; \ 850 (*found_sym)++; \
851 goto break_out; \
852 } \
853 this_sym = next_sym + 1; \
854 } while (*next_sym != '\0'); \
855 } \
676 } \ 856 } \
677 ++sym; \ 857 ++sym; \
678 } } 858 } }
679 FIND_SYM(32) 859 FIND_SYM(32)
680 FIND_SYM(64) 860 FIND_SYM(64)
681 } 861 }
682 862
863break_out:
683 if (be_wewy_wewy_quiet) return NULL; 864 if (be_wewy_wewy_quiet) return NULL;
684 865
685 if (*find_sym != '*' && *found_sym) 866 if (*find_sym != '*' && *found_sym)
686 return find_sym; 867 return ret;
687 if (be_quiet) 868 if (be_quiet)
688 return NULL; 869 return NULL;
689 else 870 else
690 return (char *)" - "; 871 return (char *)" - ";
691} 872}
873
874
692/* scan an elf file and show all the fun stuff */ 875/* scan an elf file and show all the fun stuff */
693#define prints(str) write(fileno(stdout), str, strlen(str)) 876#define prints(str) write(fileno(stdout), str, strlen(str))
694static void scanelf_file(const char *filename) 877static int scanelf_elfobj(elfobj *elf)
695{ 878{
696 unsigned long i; 879 unsigned long i;
697 char found_pax, found_phdr, found_relro, found_load, found_textrel, 880 char found_pax, found_phdr, found_relro, found_load, found_textrel,
698 found_rpath, found_needed, found_interp, found_bind, found_soname, 881 found_rpath, found_needed, found_interp, found_bind, found_soname,
699 found_sym, found_lib, found_file, found_textrels; 882 found_sym, found_lib, found_file, found_textrels;
700 elfobj *elf;
701 struct stat st;
702 static char *out_buffer = NULL; 883 static char *out_buffer = NULL;
703 static size_t out_len; 884 static size_t out_len;
704
705 /* make sure 'filename' exists */
706 if (lstat(filename, &st) == -1) {
707 if (be_verbose > 2) printf("%s: does not exist\n", filename);
708 return;
709 }
710 /* always handle regular files and handle symlinked files if no -y */
711 if (S_ISLNK(st.st_mode)) {
712 if (!scan_symlink) return;
713 stat(filename, &st);
714 }
715 if (!S_ISREG(st.st_mode)) {
716 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
717 return;
718 }
719 885
720 found_pax = found_phdr = found_relro = found_load = found_textrel = \ 886 found_pax = found_phdr = found_relro = found_load = found_textrel = \
721 found_rpath = found_needed = found_interp = found_bind = found_soname = \ 887 found_rpath = found_needed = found_interp = found_bind = found_soname = \
722 found_sym = found_lib = found_file = found_textrels = 0; 888 found_sym = found_lib = found_file = found_textrels = 0;
723 889
724 /* verify this is real ELF */
725 if ((elf = readelf(filename)) == NULL) {
726 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
727 return;
728 }
729
730 if (be_verbose > 1) 890 if (be_verbose > 2)
731 printf("%s: scanning file {%s,%s}\n", filename, 891 printf("%s: scanning file {%s,%s}\n", elf->filename,
732 get_elfeitype(EI_CLASS, elf->elf_class), 892 get_elfeitype(EI_CLASS, elf->elf_class),
733 get_elfeitype(EI_DATA, elf->data[EI_DATA])); 893 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
734 else if (be_verbose) 894 else if (be_verbose > 1)
735 printf("%s: scanning file\n", filename); 895 printf("%s: scanning file\n", elf->filename);
736 896
737 /* init output buffer */ 897 /* init output buffer */
738 if (!out_buffer) { 898 if (!out_buffer) {
739 out_len = sizeof(char) * 80; 899 out_len = sizeof(char) * 80;
740 out_buffer = (char*)xmalloc(out_len); 900 out_buffer = (char*)xmalloc(out_len);
794 case '#': 954 case '#':
795 xchrcat(&out_buffer, out_format[i], &out_len); break; 955 xchrcat(&out_buffer, out_format[i], &out_len); break;
796 case 'F': 956 case 'F':
797 found_file = 1; 957 found_file = 1;
798 if (be_wewy_wewy_quiet) break; 958 if (be_wewy_wewy_quiet) break;
799 xstrcat(&out_buffer, filename, &out_len); 959 xstrcat(&out_buffer, elf->filename, &out_len);
800 break; 960 break;
801 case 'p': 961 case 'p':
802 found_file = 1; 962 found_file = 1;
803 if (be_wewy_wewy_quiet) break; 963 if (be_wewy_wewy_quiet) break;
804 tmp = filename; 964 tmp = elf->filename;
805 if (search_path) { 965 if (search_path) {
806 ssize_t len_search = strlen(search_path); 966 ssize_t len_search = strlen(search_path);
807 ssize_t len_file = strlen(filename); 967 ssize_t len_file = strlen(elf->filename);
808 if (!strncmp(filename, search_path, len_search) && \ 968 if (!strncmp(elf->filename, search_path, len_search) && \
809 len_file > len_search) 969 len_file > len_search)
810 tmp += len_search; 970 tmp += len_search;
811 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++; 971 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
812 } 972 }
813 xstrcat(&out_buffer, tmp, &out_len); 973 xstrcat(&out_buffer, tmp, &out_len);
814 break; 974 break;
815 case 'f': 975 case 'f':
816 found_file = 1; 976 found_file = 1;
817 if (be_wewy_wewy_quiet) break; 977 if (be_wewy_wewy_quiet) break;
818 tmp = strrchr(filename, '/'); 978 tmp = strrchr(elf->filename, '/');
819 tmp = (tmp == NULL ? filename : tmp+1); 979 tmp = (tmp == NULL ? elf->filename : tmp+1);
820 xstrcat(&out_buffer, tmp, &out_len); 980 xstrcat(&out_buffer, tmp, &out_len);
821 break; 981 break;
822 case 'o': out = get_elfetype(elf); break; 982 case 'o': out = get_elfetype(elf); break;
823 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 983 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
824 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;
831 case 'b': out = scanelf_file_bind(elf, &found_bind); break; 991 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
832 case 'S': out = scanelf_file_soname(elf, &found_soname); break; 992 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
833 case 's': out = scanelf_file_sym(elf, &found_sym); break; 993 case 's': out = scanelf_file_sym(elf, &found_sym); break;
834 default: warnf("'%c' has no scan code?", out_format[i]); 994 default: warnf("'%c' has no scan code?", out_format[i]);
835 } 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
836 if (out) xstrcat(&out_buffer, out, &out_len); 1001 xstrcat(&out_buffer, out, &out_len);
1002 }
837 } 1003 }
838 1004
839#define FOUND_SOMETHING() \ 1005#define FOUND_SOMETHING() \
840 (found_pax || found_phdr || found_relro || found_load || found_textrel || \ 1006 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
841 found_rpath || found_needed || found_interp || found_bind || \ 1007 found_rpath || found_needed || found_interp || found_bind || \
842 found_soname || found_sym || found_lib || found_textrels) 1008 found_soname || found_sym || found_lib || found_textrels)
843 1009
844 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) { 1010 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
845 xchrcat(&out_buffer, ' ', &out_len); 1011 xchrcat(&out_buffer, ' ', &out_len);
846 xstrcat(&out_buffer, filename, &out_len); 1012 xstrcat(&out_buffer, elf->filename, &out_len);
847 } 1013 }
848 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) { 1014 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
849 puts(out_buffer); 1015 puts(out_buffer);
850 fflush(stdout); 1016 fflush(stdout);
851 } 1017 }
852 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:
853 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);
854} 1113}
855 1114
856/* 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 */
857static void scanelf_dir(const char *path) 1116static void scanelf_dir(const char *path)
858{ 1117{
859 register DIR *dir; 1118 register DIR *dir;
860 register struct dirent *dentry; 1119 register struct dirent *dentry;
861 struct stat st_top, st; 1120 struct stat st_top, st;
862 char buf[_POSIX_PATH_MAX]; 1121 char buf[__PAX_UTILS_PATH_MAX];
863 size_t pathlen = 0, len = 0; 1122 size_t pathlen = 0, len = 0;
864 1123
865 /* make sure path exists */ 1124 /* make sure path exists */
866 if (lstat(path, &st_top) == -1) { 1125 if (lstat(path, &st_top) == -1) {
867 if (be_verbose > 2) printf("%s: does not exist\n", path); 1126 if (be_verbose > 2) printf("%s: does not exist\n", path);
877 /* now scan the dir looking for fun stuff */ 1136 /* now scan the dir looking for fun stuff */
878 if ((dir = opendir(path)) == NULL) { 1137 if ((dir = opendir(path)) == NULL) {
879 warnf("could not opendir %s: %s", path, strerror(errno)); 1138 warnf("could not opendir %s: %s", path, strerror(errno));
880 return; 1139 return;
881 } 1140 }
882 if (be_verbose) printf("%s: scanning dir\n", path); 1141 if (be_verbose > 1) printf("%s: scanning dir\n", path);
883 1142
884 pathlen = strlen(path); 1143 pathlen = strlen(path);
885 while ((dentry = readdir(dir))) { 1144 while ((dentry = readdir(dir))) {
886 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1145 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
887 continue; 1146 continue;
906 1165
907static int scanelf_from_file(char *filename) 1166static int scanelf_from_file(char *filename)
908{ 1167{
909 FILE *fp = NULL; 1168 FILE *fp = NULL;
910 char *p; 1169 char *p;
911 char path[_POSIX_PATH_MAX]; 1170 char path[__PAX_UTILS_PATH_MAX];
912 1171
913 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL)) 1172 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL))
914 fp = stdin; 1173 fp = stdin;
915 else if ((fp = fopen(filename, "r")) == NULL) 1174 else if ((fp = fopen(filename, "r")) == NULL)
916 return 1; 1175 return 1;
917 1176
918 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1177 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
919 if ((p = strchr(path, '\n')) != NULL) 1178 if ((p = strchr(path, '\n')) != NULL)
920 *p = 0; 1179 *p = 0;
921 search_path = path; 1180 search_path = path;
922 scanelf_dir(path); 1181 scanelf_dir(path);
923 } 1182 }
928 1187
929static void load_ld_so_conf() 1188static void load_ld_so_conf()
930{ 1189{
931 FILE *fp = NULL; 1190 FILE *fp = NULL;
932 char *p; 1191 char *p;
933 char path[_POSIX_PATH_MAX]; 1192 char path[__PAX_UTILS_PATH_MAX];
934 int i = 0; 1193 int i = 0;
935 1194
936 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1195 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL)
937 return; 1196 return;
938 1197
939 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1198 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
940 if (*path != '/') 1199 if (*path != '/')
941 continue; 1200 continue;
942 1201
943 if ((p = strrchr(path, '\r')) != NULL) 1202 if ((p = strrchr(path, '\r')) != NULL)
944 *p = 0; 1203 *p = 0;
996 1255
997 free(path); 1256 free(path);
998} 1257}
999 1258
1000 1259
1001
1002/* usage / invocation handling functions */ 1260/* usage / invocation handling functions */
1003#define PARSE_FLAGS "plRmyxetrnibSs:gN:TaqvF:f:o:BhV" 1261#define PARSE_FLAGS "plRmyAXxetrnLibSs:gN:TaqvF:f:o:E:BhV"
1004#define a_argument required_argument 1262#define a_argument required_argument
1005static struct option const long_opts[] = { 1263static struct option const long_opts[] = {
1006 {"path", no_argument, NULL, 'p'}, 1264 {"path", no_argument, NULL, 'p'},
1007 {"ldpath", no_argument, NULL, 'l'}, 1265 {"ldpath", no_argument, NULL, 'l'},
1008 {"recursive", no_argument, NULL, 'R'}, 1266 {"recursive", no_argument, NULL, 'R'},
1009 {"mount", no_argument, NULL, 'm'}, 1267 {"mount", no_argument, NULL, 'm'},
1010 {"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'},
1011 {"pax", no_argument, NULL, 'x'}, 1272 {"pax", no_argument, NULL, 'x'},
1012 {"header", no_argument, NULL, 'e'}, 1273 {"header", no_argument, NULL, 'e'},
1013 {"textrel", no_argument, NULL, 't'}, 1274 {"textrel", no_argument, NULL, 't'},
1014 {"rpath", no_argument, NULL, 'r'}, 1275 {"rpath", no_argument, NULL, 'r'},
1015 {"needed", no_argument, NULL, 'n'}, 1276 {"needed", no_argument, NULL, 'n'},
1018 {"soname", no_argument, NULL, 'S'}, 1279 {"soname", no_argument, NULL, 'S'},
1019 {"symbol", a_argument, NULL, 's'}, 1280 {"symbol", a_argument, NULL, 's'},
1020 {"lib", a_argument, NULL, 'N'}, 1281 {"lib", a_argument, NULL, 'N'},
1021 {"gmatch", no_argument, NULL, 'g'}, 1282 {"gmatch", no_argument, NULL, 'g'},
1022 {"textrels", no_argument, NULL, 'T'}, 1283 {"textrels", no_argument, NULL, 'T'},
1284 {"etype", a_argument, NULL, 'E'},
1023 {"all", no_argument, NULL, 'a'}, 1285 {"all", no_argument, NULL, 'a'},
1024 {"quiet", no_argument, NULL, 'q'}, 1286 {"quiet", no_argument, NULL, 'q'},
1025 {"verbose", no_argument, NULL, 'v'}, 1287 {"verbose", no_argument, NULL, 'v'},
1026 {"format", a_argument, NULL, 'F'}, 1288 {"format", a_argument, NULL, 'F'},
1027 {"from", a_argument, NULL, 'f'}, 1289 {"from", a_argument, NULL, 'f'},
1035static const char *opts_help[] = { 1297static const char *opts_help[] = {
1036 "Scan all directories in PATH environment", 1298 "Scan all directories in PATH environment",
1037 "Scan all directories in /etc/ld.so.conf", 1299 "Scan all directories in /etc/ld.so.conf",
1038 "Scan directories recursively", 1300 "Scan directories recursively",
1039 "Don't recursively cross mount points", 1301 "Don't recursively cross mount points",
1040 "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",
1041 "Print PaX markings", 1306 "Print PaX markings",
1042 "Print GNU_STACK/PT_LOAD markings", 1307 "Print GNU_STACK/PT_LOAD markings",
1043 "Print TEXTREL information", 1308 "Print TEXTREL information",
1044 "Print RPATH information", 1309 "Print RPATH information",
1045 "Print NEEDED information", 1310 "Print NEEDED information",
1048 "Print SONAME information", 1313 "Print SONAME information",
1049 "Find a specified symbol", 1314 "Find a specified symbol",
1050 "Find a specified library", 1315 "Find a specified library",
1051 "Use strncmp to match libraries. (use with -N)", 1316 "Use strncmp to match libraries. (use with -N)",
1052 "Locate cause of TEXTREL", 1317 "Locate cause of TEXTREL",
1318 "Print only ELF files matching numeric constant",
1053 "Print all scanned info (-x -e -t -r -b)\n", 1319 "Print all scanned info (-x -e -t -r -b)\n",
1054 "Only output 'bad' things", 1320 "Only output 'bad' things",
1055 "Be verbose (can be specified more than once)", 1321 "Be verbose (can be specified more than once)",
1056 "Use specified format for output", 1322 "Use specified format for output",
1057 "Read input stream from a filename", 1323 "Read input stream from a filename",
1065/* display usage and exit */ 1331/* display usage and exit */
1066static void usage(int status) 1332static void usage(int status)
1067{ 1333{
1068 unsigned long i; 1334 unsigned long i;
1069 printf("* Scan ELF binaries for stuff\n\n" 1335 printf("* Scan ELF binaries for stuff\n\n"
1070 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0); 1336 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1071 printf("Options: -[%s]\n", PARSE_FLAGS); 1337 printf("Options: -[%s]\n", PARSE_FLAGS);
1072 for (i = 0; long_opts[i].name; ++i) 1338 for (i = 0; long_opts[i].name; ++i)
1073 if (long_opts[i].has_arg == no_argument) 1339 if (long_opts[i].has_arg == no_argument)
1074 printf(" -%c, --%-13s* %s\n", long_opts[i].val, 1340 printf(" -%c, --%-13s* %s\n", long_opts[i].val,
1075 long_opts[i].name, opts_help[i]); 1341 long_opts[i].name, opts_help[i]);
1109 VERSION, __FILE__, __DATE__, rcsid, argv0); 1375 VERSION, __FILE__, __DATE__, rcsid, argv0);
1110 exit(EXIT_SUCCESS); 1376 exit(EXIT_SUCCESS);
1111 break; 1377 break;
1112 case 'h': usage(EXIT_SUCCESS); break; 1378 case 'h': usage(EXIT_SUCCESS); break;
1113 case 'f': 1379 case 'f':
1114 if (from_file) err("Don't specify -f twice"); 1380 if (from_file) warn("You prob don't want to specify -f twice");
1115 from_file = xstrdup(optarg); 1381 from_file = optarg;
1382 break;
1383 case 'E':
1384 strncpy(match_etypes, optarg, sizeof(match_etypes));
1116 break; 1385 break;
1117 case 'o': { 1386 case 'o': {
1118 FILE *fp = NULL; 1387 FILE *fp = NULL;
1119 if ((fp = freopen(optarg, "w", stdout)) == NULL) 1388 if ((fp = freopen(optarg, "w", stdout)) == NULL)
1120 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 1389 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1139 if (out_format) warn("You prob don't want to specify -F twice"); 1408 if (out_format) warn("You prob don't want to specify -F twice");
1140 out_format = optarg; 1409 out_format = optarg;
1141 break; 1410 break;
1142 } 1411 }
1143 1412
1144 case 'g': gmatch = 1; 1413 case 'g': gmatch = 1; /* break; any reason we dont breal; here ? */
1414 case 'L': use_ldcache = 1; break;
1145 case 'y': scan_symlink = 0; break; 1415 case 'y': scan_symlink = 0; break;
1416 case 'A': scan_archives = 1; break;
1146 case 'B': show_banner = 0; break; 1417 case 'B': show_banner = 0; break;
1147 case 'l': scan_ldpath = 1; break; 1418 case 'l': scan_ldpath = 1; break;
1148 case 'p': scan_envpath = 1; break; 1419 case 'p': scan_envpath = 1; break;
1149 case 'R': dir_recurse = 1; break; 1420 case 'R': dir_recurse = 1; break;
1150 case 'm': dir_crossmount = 0; break; 1421 case 'm': dir_crossmount = 0; break;
1422 case 'X': ++fix_elf; break;
1151 case 'x': show_pax = 1; break; 1423 case 'x': show_pax = 1; break;
1152 case 'e': show_phdr = 1; break; 1424 case 'e': show_phdr = 1; break;
1153 case 't': show_textrel = 1; break; 1425 case 't': show_textrel = 1; break;
1154 case 'r': show_rpath = 1; break; 1426 case 'r': show_rpath = 1; break;
1155 case 'n': show_needed = 1; break; 1427 case 'n': show_needed = 1; break;
1160 case 'q': be_quiet = 1; break; 1432 case 'q': be_quiet = 1; break;
1161 case 'v': be_verbose = (be_verbose % 20) + 1; break; 1433 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1162 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;
1163 1435
1164 case ':': 1436 case ':':
1165 err("Option missing parameter\n"); 1437 err("Option '%c' is missing parameter", optopt);
1166 case '?': 1438 case '?':
1167 err("Unknown option\n"); 1439 err("Unknown option '%c' or argument missing", optopt);
1168 default: 1440 default:
1169 err("Unhandled option '%c'", i); 1441 err("Unhandled option '%c'; please report this", i);
1170 } 1442 }
1171 } 1443 }
1172 1444
1173 /* let the format option override all other options */ 1445 /* let the format option override all other options */
1174 if (out_format) { 1446 if (out_format) {
1221 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 1493 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1222 } 1494 }
1223 if (be_verbose > 2) printf("Format: %s\n", out_format); 1495 if (be_verbose > 2) printf("Format: %s\n", out_format);
1224 1496
1225 /* now lets actually do the scanning */ 1497 /* now lets actually do the scanning */
1226 if (scan_ldpath || (show_rpath && be_quiet)) 1498 if (scan_ldpath || use_ldcache)
1227 load_ld_so_conf(); 1499 load_ld_so_conf();
1228 if (scan_ldpath) scanelf_ldpath(); 1500 if (scan_ldpath) scanelf_ldpath();
1229 if (scan_envpath) scanelf_envpath(); 1501 if (scan_envpath) scanelf_envpath();
1230 if (from_file) { 1502 if (from_file) {
1231 scanelf_from_file(from_file); 1503 scanelf_from_file(from_file);
1232 free(from_file);
1233 from_file = *argv; 1504 from_file = *argv;
1234 } 1505 }
1235 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file) 1506 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1236 err("Nothing to scan !?"); 1507 err("Nothing to scan !?");
1237 while (optind < argc) { 1508 while (optind < argc) {
1241 1512
1242 /* clean up */ 1513 /* clean up */
1243 if (versioned_symname) free(versioned_symname); 1514 if (versioned_symname) free(versioned_symname);
1244 for (i = 0; ldpaths[i]; ++i) 1515 for (i = 0; ldpaths[i]; ++i)
1245 free(ldpaths[i]); 1516 free(ldpaths[i]);
1517
1518 if (ldcache != 0)
1519 munmap(ldcache, ldcache_size);
1246} 1520}
1247 1521
1248 1522
1249 1523
1250/* utility funcs */ 1524/* utility funcs */
1252{ 1526{
1253 char *ret = strdup(s); 1527 char *ret = strdup(s);
1254 if (!ret) err("Could not strdup(): %s", strerror(errno)); 1528 if (!ret) err("Could not strdup(): %s", strerror(errno));
1255 return ret; 1529 return ret;
1256} 1530}
1257
1258static void *xmalloc(size_t size) 1531static void *xmalloc(size_t size)
1259{ 1532{
1260 void *ret = malloc(size); 1533 void *ret = malloc(size);
1261 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size); 1534 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1262 return ret; 1535 return ret;
1263} 1536}
1264
1265static 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)
1266{ 1538{
1267 size_t new_len; 1539 size_t new_len;
1268 1540
1269 new_len = strlen(*dst) + strlen(src); 1541 new_len = strlen(*dst) + strlen(src);
1270 if (*curr_len <= new_len) { 1542 if (*curr_len <= new_len) {
1271 *curr_len = new_len + (*curr_len / 2); 1543 *curr_len = new_len + (*curr_len / 2);
1272 *dst = realloc(*dst, *curr_len); 1544 *dst = realloc(*dst, *curr_len);
1273 if (!*dst) 1545 if (!*dst)
1274 err("could not realloc %li bytes", (unsigned long)*curr_len); 1546 err("could not realloc() %li bytes", (unsigned long)*curr_len);
1275 } 1547 }
1276 1548
1549 if (n)
1550 strncat(*dst, src, n);
1551 else
1277 strcat(*dst, src); 1552 strcat(*dst, src);
1278} 1553}
1279
1280static 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)
1281{ 1555{
1282 static char my_app[2]; 1556 static char my_app[2];
1283 my_app[0] = append; 1557 my_app[0] = append;
1284 my_app[1] = '\0'; 1558 my_app[1] = '\0';

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