/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.89 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 1.89 2005/10/13 01:53:55 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#define __USE_GNU
16#include <string.h>
17#include <errno.h>
18#include <unistd.h>
19#include <sys/stat.h>
20#include <dirent.h>
21#include <getopt.h>
22#include <assert.h>
23#include "paxinc.h" 10#include "paxinc.h"
24 11
25static const char *rcsid = "$Id: scanelf.c,v 1.89 2005/10/13 01:53:55 vapier Exp $"; 12static const char *rcsid = "$Id: scanelf.c,v 1.119 2006/02/05 02:25:58 solar Exp $";
26#define argv0 "scanelf" 13#define argv0 "scanelf"
27 14
28#define IS_MODIFIER(c) (c == '%' || c == '#') 15#define IS_MODIFIER(c) (c == '%' || c == '#')
29 16
30 17
31 18
32/* 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);
33static void scanelf_file(const char *filename); 23static void scanelf_file(const char *filename);
34static void scanelf_dir(const char *path); 24static void scanelf_dir(const char *path);
35static void scanelf_ldpath(); 25static void scanelf_ldpath(void);
36static void scanelf_envpath(); 26static void scanelf_envpath(void);
37static void usage(int status); 27static void usage(int status);
38static void parseargs(int argc, char *argv[]); 28static void parseargs(int argc, char *argv[]);
39static char *xstrdup(const char *s); 29static char *xstrdup(const char *s);
40static void *xmalloc(size_t size); 30static void *xmalloc(size_t size);
41static 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)
42static 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);
43 34
44/* variables to control behavior */ 35/* variables to control behavior */
36static char match_etypes[126] = "";
45static char *ldpaths[256]; 37static char *ldpaths[256];
46static char scan_ldpath = 0; 38static char scan_ldpath = 0;
47static char scan_envpath = 0; 39static char scan_envpath = 0;
48static char scan_symlink = 1; 40static char scan_symlink = 1;
41static char scan_archives = 0;
49static char dir_recurse = 0; 42static char dir_recurse = 0;
50static char dir_crossmount = 1; 43static char dir_crossmount = 1;
51static char show_pax = 0; 44static char show_pax = 0;
52static char show_phdr = 0; 45static char show_phdr = 0;
53static char show_textrel = 0; 46static char show_textrel = 0;
63static char be_wewy_wewy_quiet = 0; 56static char be_wewy_wewy_quiet = 0;
64static char *find_sym = NULL, *versioned_symname = NULL; 57static char *find_sym = NULL, *versioned_symname = NULL;
65static char *find_lib = NULL; 58static char *find_lib = NULL;
66static char *out_format = NULL; 59static char *out_format = NULL;
67static char *search_path = NULL; 60static char *search_path = NULL;
61static char fix_elf = 0;
68static char gmatch = 0; 62static char gmatch = 0;
63static char use_ldcache = 0;
69 64
65
66caddr_t ldcache = 0;
67size_t ldcache_size = 0;
70 68
71/* sub-funcs for scanelf_file() */ 69/* sub-funcs for scanelf_file() */
72static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab) 70static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
73{ 71{
74 /* find the best SHT_DYNSYM and SHT_STRTAB sections */ 72 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
95 GET_SYMTABS(32) 93 GET_SYMTABS(32)
96 GET_SYMTABS(64) 94 GET_SYMTABS(64)
97} 95}
98static char *scanelf_file_pax(elfobj *elf, char *found_pax) 96static char *scanelf_file_pax(elfobj *elf, char *found_pax)
99{ 97{
100 static char *paxflags;
101 static char ret[7]; 98 static char ret[7];
102 unsigned long i, shown; 99 unsigned long i, shown;
103 100
104 if (!show_pax) return NULL; 101 if (!show_pax) return NULL;
105 102
126 SHOW_PAX(64) 123 SHOW_PAX(64)
127 } 124 }
128 125
129 /* fall back to EI_PAX if no PT_PAX was found */ 126 /* fall back to EI_PAX if no PT_PAX was found */
130 if (!*ret) { 127 if (!*ret) {
128 static char *paxflags;
131 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf)); 129 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
132 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) { 130 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
133 *found_pax = 1; 131 *found_pax = 1;
134 return paxflags; 132 return (be_wewy_wewy_quiet ? NULL : paxflags);
135 } 133 }
136 strncpy(ret, paxflags, sizeof(ret)); 134 strncpy(ret, paxflags, sizeof(ret));
137 } 135 }
138 136
139 if (be_quiet && !shown) 137 if (be_wewy_wewy_quiet || (be_quiet && !shown))
140 return NULL; 138 return NULL;
139 else
141 return ret; 140 return ret;
142
143} 141}
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, off, shown, check_flags;
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 if (elf->phdr) { 158#define NOTE_GNU_STACK ".note.GNU-stack"
159#define SHOW_PHDR(B) \ 159#define SHOW_PHDR(B) \
160 if (elf->elf_class == ELFCLASS ## B) { \ 160 if (elf->elf_class == ELFCLASS ## B) { \
161 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) { \
162 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 165 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
163 uint32_t flags; \
164 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 166 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
165 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \ 167 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
166 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); \
167 found = found_phdr; \ 169 found = found_phdr; \
168 off = 0; \ 170 offset = 0; \
169 check_flags = PF_X; \ 171 check_flags = PF_X; \
170 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \ 172 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
171 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); \
172 found = found_relro; \ 174 found = found_relro; \
173 off = 4; \ 175 offset = 4; \
174 check_flags = PF_X; \ 176 check_flags = PF_X; \
175 } 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) \
176 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); \
177 found = found_load; \ 180 found = found_load; \
178 off = 8; \ 181 offset = 8; \
179 check_flags = PF_W|PF_X; \ 182 check_flags = PF_W|PF_X; \
180 } else \ 183 } else \
181 continue; \ 184 continue; \
182 flags = EGET(phdr[i].p_flags); \ 185 flags = EGET(phdr[i].p_flags); \
183 if (be_quiet && ((flags & check_flags) != check_flags)) \ 186 if (be_quiet && ((flags & check_flags) != check_flags)) \
184 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 } \
185 memcpy(ret+off, gnu_short_stack_flags(flags), 3); \ 193 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
186 *found = 1; \ 194 *found = 1; \
187 ++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 } \
188 } \ 230 } \
189 } 231 }
190 SHOW_PHDR(32) 232 SHOW_PHDR(32)
191 SHOW_PHDR(64) 233 SHOW_PHDR(64)
192 }
193 234
194 if (be_quiet && !shown) 235 if (be_wewy_wewy_quiet || (be_quiet && !shown))
195 return NULL; 236 return NULL;
196 else 237 else
197 return ret; 238 return ret;
198} 239}
199static char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 240static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
200{ 241{
201 static char ret[] = "TEXTREL"; 242 static const char *ret = "TEXTREL";
202 unsigned long i; 243 unsigned long i;
203 244
204 if (!show_textrel && !show_textrels) return NULL; 245 if (!show_textrel && !show_textrels) return NULL;
205 246
206 if (elf->phdr) { 247 if (elf->phdr) {
229 } 270 }
230 271
231 if (be_quiet || be_wewy_wewy_quiet) 272 if (be_quiet || be_wewy_wewy_quiet)
232 return NULL; 273 return NULL;
233 else 274 else
234 return (char *)" - "; 275 return " - ";
235} 276}
236static 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)
237{ 278{
238 unsigned long s, r, rmax; 279 unsigned long s, r, rmax;
239 void *symtab_void, *strtab_void, *text_void; 280 void *symtab_void, *strtab_void, *text_void;
292 if (be_verbose <= 2) continue; \ 333 if (be_verbose <= 2) continue; \
293 } else \ 334 } else \
294 *found_textrels = 1; \ 335 *found_textrels = 1; \
295 /* locate this relocation symbol name */ \ 336 /* locate this relocation symbol name */ \
296 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 } \
297 sym_max = ELF ## B ## _R_SYM(r_info); \ 342 sym_max = ELF ## B ## _R_SYM(r_info); \
298 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \ 343 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
299 sym += sym_max; \ 344 sym += sym_max; \
300 else \ 345 else \
301 sym = NULL; \ 346 sym = NULL; \
333 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);
334 379
335 return NULL; 380 return NULL;
336} 381}
337 382
338static void rpath_security_checks(elfobj *, char *); 383static void rpath_security_checks(elfobj *, char *, const char *);
339static void rpath_security_checks(elfobj *elf, char *item) { 384static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
385{
340 struct stat st; 386 struct stat st;
341 switch (*item) { 387 switch (*item) {
342 case '/': break; 388 case '/': break;
343 case '.': 389 case '.':
344 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);
345 break; 391 break;
392 case ':':
346 case '\0': 393 case '\0':
347 warnf("Security problem NULL RPATH in %s", elf->filename); 394 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
348 break; 395 break;
349 case '$': 396 case '$':
350 if (fstat(elf->fd, &st) != -1) 397 if (fstat(elf->fd, &st) != -1)
351 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID)) 398 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
352 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",
353 item, elf->filename, st.st_mode & 07777); 400 dt_type, item, elf->filename, st.st_mode & 07777);
354 break; 401 break;
355 default: 402 default:
356 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);
357 break; 404 break;
358 } 405 }
359} 406}
360static 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)
361{ 408{
397 /* Verify the memory is somewhat sane */ \ 444 /* Verify the memory is somewhat sane */ \
398 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 445 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
399 if (offset < (Elf ## B ## _Off)elf->len) { \ 446 if (offset < (Elf ## B ## _Off)elf->len) { \
400 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \ 447 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
401 *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); \
402 /* If quiet, don't output paths in ld.so.conf */ \ 452 /* If quiet, don't output paths in ld.so.conf */ \
403 if (be_quiet) { \ 453 if (be_quiet) { \
404 size_t len; \ 454 size_t len; \
405 char *start, *end; \ 455 char *start, *end; \
406 /* note that we only 'chop' off leading known paths. */ \ 456 /* note that we only 'chop' off leading known paths. */ \
407 /* 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. */ \
408 start = *r; \ 458 start = *r; \
409 /* scan each path in : delimited list */ \ 459 /* scan each path in : delimited list */ \
410 while (start) { \ 460 while (start) { \
411 rpath_security_checks(elf, start); \ 461 rpath_security_checks(elf, start, get_elfdtype(word)); \
412 end = strchr(start, ':'); \ 462 end = strchr(start, ':'); \
413 len = (end ? abs(end - start) : strlen(start)); \ 463 len = (end ? abs(end - start) : strlen(start)); \
464 if (use_ldcache) \
414 for (s = 0; ldpaths[s]; ++s) { \ 465 for (s = 0; ldpaths[s]; ++s) \
415 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \ 466 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
416 *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)++; \
417 break; \ 472 break; \
418 } \ 473 } \
419 } \
420 if (!*r || !ldpaths[s] || !end) \ 474 if (!*r || !end) \
421 start = NULL; \ 475 break; \
422 else \ 476 else \
423 start = start + len + 1; \ 477 start = start + len + 1; \
424 } \ 478 } \
425 } \ 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) \
426 if (*r) *found_rpath = 1; \ 520 *found_rpath = 1; \
521 } \
427 } \ 522 } \
428 ++dyn; \ 523 ++dyn; \
429 } \ 524 } \
430 } } 525 } }
431 SHOW_RPATH(32) 526 SHOW_RPATH(32)
448 } else if (rpath || runpath) 543 } else if (rpath || runpath)
449 xstrcat(ret, (runpath ? runpath : rpath), ret_len); 544 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
450 else if (!be_quiet) 545 else if (!be_quiet)
451 xstrcat(ret, " - ", ret_len); 546 xstrcat(ret, " - ", ret_len);
452} 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
453static 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)
454{ 637{
455 unsigned long i; 638 unsigned long i;
456 char *needed; 639 char *needed;
457 void *strtbl_void; 640 void *strtbl_void;
641 char *p;
458 642
459 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL; 643 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
460 644
461 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 645 strtbl_void = elf_findsecbyname(elf, ".dynstr");
462 646
482 } \ 666 } \
483 needed = (char*)(elf->data + offset); \ 667 needed = (char*)(elf->data + offset); \
484 if (op == 0) { \ 668 if (op == 0) { \
485 if (!be_wewy_wewy_quiet) { \ 669 if (!be_wewy_wewy_quiet) { \
486 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; \
487 xstrcat(ret, needed, ret_len); \ 674 xstrcat(ret, needed, ret_len); \
488 } \ 675 } \
489 *found_needed = 1; \ 676 *found_needed = 1; \
490 } else { \ 677 } else { \
491 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \ 678 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \
615 return NULL; 802 return NULL;
616} 803}
617static char *scanelf_file_sym(elfobj *elf, char *found_sym) 804static char *scanelf_file_sym(elfobj *elf, char *found_sym)
618{ 805{
619 unsigned long i; 806 unsigned long i;
807 char *ret;
620 void *symtab_void, *strtab_void; 808 void *symtab_void, *strtab_void;
621 809
622 if (!find_sym) return NULL; 810 if (!find_sym) return NULL;
811 ret = find_sym;
623 812
624 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void); 813 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
625 814
626 if (symtab_void && strtab_void) { 815 if (symtab_void && strtab_void) {
627#define FIND_SYM(B) \ 816#define FIND_SYM(B) \
628 if (elf->elf_class == ELFCLASS ## B) { \ 817 if (elf->elf_class == ELFCLASS ## B) { \
629 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 818 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
630 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 819 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
631 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)); \
632 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 821 unsigned long cnt = EGET(symtab->sh_entsize); \
633 char *symname; \ 822 char *symname; \
823 if (cnt) \
824 cnt = EGET(symtab->sh_size) / cnt; \
634 for (i = 0; i < cnt; ++i) { \ 825 for (i = 0; i < cnt; ++i) { \
635 if (sym->st_name) { \ 826 if (sym->st_name) { \
636 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 } \
637 if (*find_sym == '*') { \ 832 if (*find_sym == '*') { \
638 printf("%s(%s) %5lX %15s %s\n", \ 833 printf("%s(%s) %5lX %15s %s\n", \
639 ((*found_sym == 0) ? "\n\t" : "\t"), \ 834 ((*found_sym == 0) ? "\n\t" : "\t"), \
640 elf->base_filename, \ 835 elf->base_filename, \
641 (long)sym->st_size, \ 836 (unsigned long)sym->st_size, \
642 (char *)get_elfstttype(sym->st_info), \ 837 get_elfstttype(sym->st_info), \
643 symname); \ 838 symname); \
644 *found_sym = 1; \ 839 *found_sym = 1; \
645 } 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') || \
646 (strcmp(symname, versioned_symname) == 0)) \ 848 (strcmp(symname, versioned_symname) == 0)) { \
849 ret = this_sym; \
647 (*found_sym)++; \ 850 (*found_sym)++; \
851 goto break_out; \
852 } \
853 this_sym = next_sym + 1; \
854 } while (*next_sym != '\0'); \
855 } \
648 } \ 856 } \
649 ++sym; \ 857 ++sym; \
650 } } 858 } }
651 FIND_SYM(32) 859 FIND_SYM(32)
652 FIND_SYM(64) 860 FIND_SYM(64)
653 } 861 }
654 862
863break_out:
655 if (be_wewy_wewy_quiet) return NULL; 864 if (be_wewy_wewy_quiet) return NULL;
656 865
657 if (*find_sym != '*' && *found_sym) 866 if (*find_sym != '*' && *found_sym)
658 return find_sym; 867 return ret;
659 if (be_quiet) 868 if (be_quiet)
660 return NULL; 869 return NULL;
661 else 870 else
662 return (char *)" - "; 871 return (char *)" - ";
663} 872}
873
874
664/* scan an elf file and show all the fun stuff */ 875/* scan an elf file and show all the fun stuff */
665#define prints(str) write(fileno(stdout), str, strlen(str)) 876#define prints(str) write(fileno(stdout), str, strlen(str))
666static void scanelf_file(const char *filename) 877static int scanelf_elfobj(elfobj *elf)
667{ 878{
668 unsigned long i; 879 unsigned long i;
669 char found_pax, found_phdr, found_relro, found_load, found_textrel, 880 char found_pax, found_phdr, found_relro, found_load, found_textrel,
670 found_rpath, found_needed, found_interp, found_bind, found_soname, 881 found_rpath, found_needed, found_interp, found_bind, found_soname,
671 found_sym, found_lib, found_file, found_textrels; 882 found_sym, found_lib, found_file, found_textrels;
672 elfobj *elf;
673 struct stat st;
674 static char *out_buffer = NULL; 883 static char *out_buffer = NULL;
675 static size_t out_len; 884 static size_t out_len;
676
677 /* make sure 'filename' exists */
678 if (lstat(filename, &st) == -1) {
679 if (be_verbose > 2) printf("%s: does not exist\n", filename);
680 return;
681 }
682 /* always handle regular files and handle symlinked files if no -y */
683 if (S_ISLNK(st.st_mode)) {
684 if (!scan_symlink) return;
685 stat(filename, &st);
686 }
687 if (!S_ISREG(st.st_mode)) {
688 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
689 return;
690 }
691 885
692 found_pax = found_phdr = found_relro = found_load = found_textrel = \ 886 found_pax = found_phdr = found_relro = found_load = found_textrel = \
693 found_rpath = found_needed = found_interp = found_bind = found_soname = \ 887 found_rpath = found_needed = found_interp = found_bind = found_soname = \
694 found_sym = found_lib = found_file = found_textrels = 0; 888 found_sym = found_lib = found_file = found_textrels = 0;
695 889
696 /* verify this is real ELF */
697 if ((elf = readelf(filename)) == NULL) {
698 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
699 return;
700 }
701
702 if (be_verbose > 1) 890 if (be_verbose > 2)
703 printf("%s: scanning file {%s,%s}\n", filename, 891 printf("%s: scanning file {%s,%s}\n", elf->filename,
704 get_elfeitype(EI_CLASS, elf->elf_class), 892 get_elfeitype(EI_CLASS, elf->elf_class),
705 get_elfeitype(EI_DATA, elf->data[EI_DATA])); 893 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
706 else if (be_verbose) 894 else if (be_verbose > 1)
707 printf("%s: scanning file\n", filename); 895 printf("%s: scanning file\n", elf->filename);
708 896
709 /* init output buffer */ 897 /* init output buffer */
710 if (!out_buffer) { 898 if (!out_buffer) {
711 out_len = sizeof(char) * 80; 899 out_len = sizeof(char) * 80;
712 out_buffer = (char*)xmalloc(out_len); 900 out_buffer = (char*)xmalloc(out_len);
766 case '#': 954 case '#':
767 xchrcat(&out_buffer, out_format[i], &out_len); break; 955 xchrcat(&out_buffer, out_format[i], &out_len); break;
768 case 'F': 956 case 'F':
769 found_file = 1; 957 found_file = 1;
770 if (be_wewy_wewy_quiet) break; 958 if (be_wewy_wewy_quiet) break;
771 xstrcat(&out_buffer, filename, &out_len); 959 xstrcat(&out_buffer, elf->filename, &out_len);
772 break; 960 break;
773 case 'p': 961 case 'p':
774 found_file = 1; 962 found_file = 1;
775 if (be_wewy_wewy_quiet) break; 963 if (be_wewy_wewy_quiet) break;
776 tmp = filename; 964 tmp = elf->filename;
777 if (search_path) { 965 if (search_path) {
778 ssize_t len_search = strlen(search_path); 966 ssize_t len_search = strlen(search_path);
779 ssize_t len_file = strlen(filename); 967 ssize_t len_file = strlen(elf->filename);
780 if (!strncmp(filename, search_path, len_search) && \ 968 if (!strncmp(elf->filename, search_path, len_search) && \
781 len_file > len_search) 969 len_file > len_search)
782 tmp += len_search; 970 tmp += len_search;
783 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++; 971 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
784 } 972 }
785 xstrcat(&out_buffer, tmp, &out_len); 973 xstrcat(&out_buffer, tmp, &out_len);
786 break; 974 break;
787 case 'f': 975 case 'f':
788 found_file = 1; 976 found_file = 1;
789 if (be_wewy_wewy_quiet) break; 977 if (be_wewy_wewy_quiet) break;
790 tmp = strrchr(filename, '/'); 978 tmp = strrchr(elf->filename, '/');
791 tmp = (tmp == NULL ? filename : tmp+1); 979 tmp = (tmp == NULL ? elf->filename : tmp+1);
792 xstrcat(&out_buffer, tmp, &out_len); 980 xstrcat(&out_buffer, tmp, &out_len);
793 break; 981 break;
794 case 'o': out = get_elfetype(elf); break; 982 case 'o': out = get_elfetype(elf); break;
795 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 983 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
796 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;
803 case 'b': out = scanelf_file_bind(elf, &found_bind); break; 991 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
804 case 'S': out = scanelf_file_soname(elf, &found_soname); break; 992 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
805 case 's': out = scanelf_file_sym(elf, &found_sym); break; 993 case 's': out = scanelf_file_sym(elf, &found_sym); break;
806 default: warnf("'%c' has no scan code?", out_format[i]); 994 default: warnf("'%c' has no scan code?", out_format[i]);
807 } 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
808 if (out) xstrcat(&out_buffer, out, &out_len); 1001 xstrcat(&out_buffer, out, &out_len);
1002 }
809 } 1003 }
810 1004
811#define FOUND_SOMETHING() \ 1005#define FOUND_SOMETHING() \
812 (found_pax || found_phdr || found_relro || found_load || found_textrel || \ 1006 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
813 found_rpath || found_needed || found_interp || found_bind || \ 1007 found_rpath || found_needed || found_interp || found_bind || \
814 found_soname || found_sym || found_lib || found_textrels) 1008 found_soname || found_sym || found_lib || found_textrels)
815 1009
816 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) { 1010 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
817 xchrcat(&out_buffer, ' ', &out_len); 1011 xchrcat(&out_buffer, ' ', &out_len);
818 xstrcat(&out_buffer, filename, &out_len); 1012 xstrcat(&out_buffer, elf->filename, &out_len);
819 } 1013 }
820 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) { 1014 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
821 puts(out_buffer); 1015 puts(out_buffer);
822 fflush(stdout); 1016 fflush(stdout);
823 } 1017 }
824 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:
825 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);
826} 1113}
827 1114
828/* 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 */
829static void scanelf_dir(const char *path) 1116static void scanelf_dir(const char *path)
830{ 1117{
831 register DIR *dir; 1118 register DIR *dir;
832 register struct dirent *dentry; 1119 register struct dirent *dentry;
833 struct stat st_top, st; 1120 struct stat st_top, st;
834 char buf[_POSIX_PATH_MAX]; 1121 char buf[__PAX_UTILS_PATH_MAX];
835 size_t pathlen = 0, len = 0; 1122 size_t pathlen = 0, len = 0;
836 1123
837 /* make sure path exists */ 1124 /* make sure path exists */
838 if (lstat(path, &st_top) == -1) { 1125 if (lstat(path, &st_top) == -1) {
839 if (be_verbose > 2) printf("%s: does not exist\n", path); 1126 if (be_verbose > 2) printf("%s: does not exist\n", path);
849 /* now scan the dir looking for fun stuff */ 1136 /* now scan the dir looking for fun stuff */
850 if ((dir = opendir(path)) == NULL) { 1137 if ((dir = opendir(path)) == NULL) {
851 warnf("could not opendir %s: %s", path, strerror(errno)); 1138 warnf("could not opendir %s: %s", path, strerror(errno));
852 return; 1139 return;
853 } 1140 }
854 if (be_verbose) printf("%s: scanning dir\n", path); 1141 if (be_verbose > 1) printf("%s: scanning dir\n", path);
855 1142
856 pathlen = strlen(path); 1143 pathlen = strlen(path);
857 while ((dentry = readdir(dir))) { 1144 while ((dentry = readdir(dir))) {
858 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1145 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
859 continue; 1146 continue;
878 1165
879static int scanelf_from_file(char *filename) 1166static int scanelf_from_file(char *filename)
880{ 1167{
881 FILE *fp = NULL; 1168 FILE *fp = NULL;
882 char *p; 1169 char *p;
883 char path[_POSIX_PATH_MAX]; 1170 char path[__PAX_UTILS_PATH_MAX];
884 1171
885 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL)) 1172 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL))
886 fp = stdin; 1173 fp = stdin;
887 else if ((fp = fopen(filename, "r")) == NULL) 1174 else if ((fp = fopen(filename, "r")) == NULL)
888 return 1; 1175 return 1;
889 1176
890 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1177 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
891 if ((p = strchr(path, '\n')) != NULL) 1178 if ((p = strchr(path, '\n')) != NULL)
892 *p = 0; 1179 *p = 0;
893 search_path = path; 1180 search_path = path;
894 scanelf_dir(path); 1181 scanelf_dir(path);
895 } 1182 }
900 1187
901static void load_ld_so_conf() 1188static void load_ld_so_conf()
902{ 1189{
903 FILE *fp = NULL; 1190 FILE *fp = NULL;
904 char *p; 1191 char *p;
905 char path[_POSIX_PATH_MAX]; 1192 char path[__PAX_UTILS_PATH_MAX];
906 int i = 0; 1193 int i = 0;
907 1194
908 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1195 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL)
909 return; 1196 return;
910 1197
911 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1198 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
912 if (*path != '/') 1199 if (*path != '/')
913 continue; 1200 continue;
914 1201
915 if ((p = strrchr(path, '\r')) != NULL) 1202 if ((p = strrchr(path, '\r')) != NULL)
916 *p = 0; 1203 *p = 0;
968 1255
969 free(path); 1256 free(path);
970} 1257}
971 1258
972 1259
973
974/* usage / invocation handling functions */ 1260/* usage / invocation handling functions */
975#define PARSE_FLAGS "plRmyxetrnibSs:gN:TaqvF:f:o:BhV" 1261#define PARSE_FLAGS "plRmyAXxetrnLibSs:gN:TaqvF:f:o:E:BhV"
976#define a_argument required_argument 1262#define a_argument required_argument
977static struct option const long_opts[] = { 1263static struct option const long_opts[] = {
978 {"path", no_argument, NULL, 'p'}, 1264 {"path", no_argument, NULL, 'p'},
979 {"ldpath", no_argument, NULL, 'l'}, 1265 {"ldpath", no_argument, NULL, 'l'},
980 {"recursive", no_argument, NULL, 'R'}, 1266 {"recursive", no_argument, NULL, 'R'},
981 {"mount", no_argument, NULL, 'm'}, 1267 {"mount", no_argument, NULL, 'm'},
982 {"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'},
983 {"pax", no_argument, NULL, 'x'}, 1272 {"pax", no_argument, NULL, 'x'},
984 {"header", no_argument, NULL, 'e'}, 1273 {"header", no_argument, NULL, 'e'},
985 {"textrel", no_argument, NULL, 't'}, 1274 {"textrel", no_argument, NULL, 't'},
986 {"rpath", no_argument, NULL, 'r'}, 1275 {"rpath", no_argument, NULL, 'r'},
987 {"needed", no_argument, NULL, 'n'}, 1276 {"needed", no_argument, NULL, 'n'},
990 {"soname", no_argument, NULL, 'S'}, 1279 {"soname", no_argument, NULL, 'S'},
991 {"symbol", a_argument, NULL, 's'}, 1280 {"symbol", a_argument, NULL, 's'},
992 {"lib", a_argument, NULL, 'N'}, 1281 {"lib", a_argument, NULL, 'N'},
993 {"gmatch", no_argument, NULL, 'g'}, 1282 {"gmatch", no_argument, NULL, 'g'},
994 {"textrels", no_argument, NULL, 'T'}, 1283 {"textrels", no_argument, NULL, 'T'},
1284 {"etype", a_argument, NULL, 'E'},
995 {"all", no_argument, NULL, 'a'}, 1285 {"all", no_argument, NULL, 'a'},
996 {"quiet", no_argument, NULL, 'q'}, 1286 {"quiet", no_argument, NULL, 'q'},
997 {"verbose", no_argument, NULL, 'v'}, 1287 {"verbose", no_argument, NULL, 'v'},
998 {"format", a_argument, NULL, 'F'}, 1288 {"format", a_argument, NULL, 'F'},
999 {"from", a_argument, NULL, 'f'}, 1289 {"from", a_argument, NULL, 'f'},
1007static const char *opts_help[] = { 1297static const char *opts_help[] = {
1008 "Scan all directories in PATH environment", 1298 "Scan all directories in PATH environment",
1009 "Scan all directories in /etc/ld.so.conf", 1299 "Scan all directories in /etc/ld.so.conf",
1010 "Scan directories recursively", 1300 "Scan directories recursively",
1011 "Don't recursively cross mount points", 1301 "Don't recursively cross mount points",
1012 "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",
1013 "Print PaX markings", 1306 "Print PaX markings",
1014 "Print GNU_STACK/PT_LOAD markings", 1307 "Print GNU_STACK/PT_LOAD markings",
1015 "Print TEXTREL information", 1308 "Print TEXTREL information",
1016 "Print RPATH information", 1309 "Print RPATH information",
1017 "Print NEEDED information", 1310 "Print NEEDED information",
1020 "Print SONAME information", 1313 "Print SONAME information",
1021 "Find a specified symbol", 1314 "Find a specified symbol",
1022 "Find a specified library", 1315 "Find a specified library",
1023 "Use strncmp to match libraries. (use with -N)", 1316 "Use strncmp to match libraries. (use with -N)",
1024 "Locate cause of TEXTREL", 1317 "Locate cause of TEXTREL",
1318 "Print only ELF files matching numeric constant",
1025 "Print all scanned info (-x -e -t -r -b)\n", 1319 "Print all scanned info (-x -e -t -r -b)\n",
1026 "Only output 'bad' things", 1320 "Only output 'bad' things",
1027 "Be verbose (can be specified more than once)", 1321 "Be verbose (can be specified more than once)",
1028 "Use specified format for output", 1322 "Use specified format for output",
1029 "Read input stream from a filename", 1323 "Read input stream from a filename",
1037/* display usage and exit */ 1331/* display usage and exit */
1038static void usage(int status) 1332static void usage(int status)
1039{ 1333{
1040 unsigned long i; 1334 unsigned long i;
1041 printf("* Scan ELF binaries for stuff\n\n" 1335 printf("* Scan ELF binaries for stuff\n\n"
1042 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0); 1336 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1043 printf("Options: -[%s]\n", PARSE_FLAGS); 1337 printf("Options: -[%s]\n", PARSE_FLAGS);
1044 for (i = 0; long_opts[i].name; ++i) 1338 for (i = 0; long_opts[i].name; ++i)
1045 if (long_opts[i].has_arg == no_argument) 1339 if (long_opts[i].has_arg == no_argument)
1046 printf(" -%c, --%-13s* %s\n", long_opts[i].val, 1340 printf(" -%c, --%-13s* %s\n", long_opts[i].val,
1047 long_opts[i].name, opts_help[i]); 1341 long_opts[i].name, opts_help[i]);
1081 VERSION, __FILE__, __DATE__, rcsid, argv0); 1375 VERSION, __FILE__, __DATE__, rcsid, argv0);
1082 exit(EXIT_SUCCESS); 1376 exit(EXIT_SUCCESS);
1083 break; 1377 break;
1084 case 'h': usage(EXIT_SUCCESS); break; 1378 case 'h': usage(EXIT_SUCCESS); break;
1085 case 'f': 1379 case 'f':
1086 if (from_file) err("Don't specify -f twice"); 1380 if (from_file) warn("You prob don't want to specify -f twice");
1087 from_file = xstrdup(optarg); 1381 from_file = optarg;
1382 break;
1383 case 'E':
1384 strncpy(match_etypes, optarg, sizeof(match_etypes));
1088 break; 1385 break;
1089 case 'o': { 1386 case 'o': {
1090 FILE *fp = NULL; 1387 FILE *fp = NULL;
1091 if ((fp = freopen(optarg, "w", stdout)) == NULL) 1388 if ((fp = freopen(optarg, "w", stdout)) == NULL)
1092 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 1389 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1093 SET_STDOUT(fp); 1390 SET_STDOUT(fp);
1094 break; 1391 break;
1095 } 1392 }
1096 1393
1097 case 's': { 1394 case 's': {
1098 size_t len;
1099 if (find_sym) err("Don't specify -s twice"); 1395 if (find_sym) warn("You prob don't want to specify -s twice");
1100 find_sym = xstrdup(optarg); 1396 find_sym = optarg;
1101 len = strlen(find_sym) + 1;
1102 versioned_symname = (char*)xmalloc(sizeof(char) * (len+1)); 1397 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1103 sprintf(versioned_symname, "%s@", find_sym); 1398 sprintf(versioned_symname, "%s@", find_sym);
1104 break; 1399 break;
1105 } 1400 }
1106 case 'N': { 1401 case 'N': {
1107 if (find_lib) err("Don't specify -N twice"); 1402 if (find_lib) warn("You prob don't want to specify -N twice");
1108 find_lib = xstrdup(optarg); 1403 find_lib = optarg;
1109 break; 1404 break;
1110 } 1405 }
1111 1406
1112 case 'F': { 1407 case 'F': {
1113 if (out_format) err("Don't specify -F twice"); 1408 if (out_format) warn("You prob don't want to specify -F twice");
1114 out_format = xstrdup(optarg); 1409 out_format = optarg;
1115 break; 1410 break;
1116 } 1411 }
1117 1412
1118 case 'g': gmatch = 1; 1413 case 'g': gmatch = 1; /* break; any reason we dont breal; here ? */
1414 case 'L': use_ldcache = 1; break;
1119 case 'y': scan_symlink = 0; break; 1415 case 'y': scan_symlink = 0; break;
1416 case 'A': scan_archives = 1; break;
1120 case 'B': show_banner = 0; break; 1417 case 'B': show_banner = 0; break;
1121 case 'l': scan_ldpath = 1; break; 1418 case 'l': scan_ldpath = 1; break;
1122 case 'p': scan_envpath = 1; break; 1419 case 'p': scan_envpath = 1; break;
1123 case 'R': dir_recurse = 1; break; 1420 case 'R': dir_recurse = 1; break;
1124 case 'm': dir_crossmount = 0; break; 1421 case 'm': dir_crossmount = 0; break;
1422 case 'X': ++fix_elf; break;
1125 case 'x': show_pax = 1; break; 1423 case 'x': show_pax = 1; break;
1126 case 'e': show_phdr = 1; break; 1424 case 'e': show_phdr = 1; break;
1127 case 't': show_textrel = 1; break; 1425 case 't': show_textrel = 1; break;
1128 case 'r': show_rpath = 1; break; 1426 case 'r': show_rpath = 1; break;
1129 case 'n': show_needed = 1; break; 1427 case 'n': show_needed = 1; break;
1134 case 'q': be_quiet = 1; break; 1432 case 'q': be_quiet = 1; break;
1135 case 'v': be_verbose = (be_verbose % 20) + 1; break; 1433 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1136 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;
1137 1435
1138 case ':': 1436 case ':':
1139 err("Option missing parameter\n"); 1437 err("Option '%c' is missing parameter", optopt);
1140 case '?': 1438 case '?':
1141 err("Unknown option\n"); 1439 err("Unknown option '%c' or argument missing", optopt);
1142 default: 1440 default:
1143 err("Unhandled option '%c'", i); 1441 err("Unhandled option '%c'; please report this", i);
1144 } 1442 }
1145 } 1443 }
1146 1444
1147 /* let the format option override all other options */ 1445 /* let the format option override all other options */
1148 if (out_format) { 1446 if (out_format) {
1195 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 1493 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1196 } 1494 }
1197 if (be_verbose > 2) printf("Format: %s\n", out_format); 1495 if (be_verbose > 2) printf("Format: %s\n", out_format);
1198 1496
1199 /* now lets actually do the scanning */ 1497 /* now lets actually do the scanning */
1200 if (scan_ldpath || (show_rpath && be_quiet)) 1498 if (scan_ldpath || use_ldcache)
1201 load_ld_so_conf(); 1499 load_ld_so_conf();
1202 if (scan_ldpath) scanelf_ldpath(); 1500 if (scan_ldpath) scanelf_ldpath();
1203 if (scan_envpath) scanelf_envpath(); 1501 if (scan_envpath) scanelf_envpath();
1204 if (from_file) { 1502 if (from_file) {
1205 scanelf_from_file(from_file); 1503 scanelf_from_file(from_file);
1206 free(from_file);
1207 from_file = *argv; 1504 from_file = *argv;
1208 } 1505 }
1209 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file) 1506 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1210 err("Nothing to scan !?"); 1507 err("Nothing to scan !?");
1211 while (optind < argc) { 1508 while (optind < argc) {
1212 search_path = argv[optind++]; 1509 search_path = argv[optind++];
1213 scanelf_dir(search_path); 1510 scanelf_dir(search_path);
1214 } 1511 }
1215 1512
1216 /* clean up */ 1513 /* clean up */
1217 if (find_sym) { 1514 if (versioned_symname) free(versioned_symname);
1218 free(find_sym);
1219 free(versioned_symname);
1220 }
1221 if (find_lib) free(find_lib);
1222 if (out_format) free(out_format);
1223 for (i = 0; ldpaths[i]; ++i) 1515 for (i = 0; ldpaths[i]; ++i)
1224 free(ldpaths[i]); 1516 free(ldpaths[i]);
1517
1518 if (ldcache != 0)
1519 munmap(ldcache, ldcache_size);
1225} 1520}
1226 1521
1227 1522
1228 1523
1229/* utility funcs */ 1524/* utility funcs */
1231{ 1526{
1232 char *ret = strdup(s); 1527 char *ret = strdup(s);
1233 if (!ret) err("Could not strdup(): %s", strerror(errno)); 1528 if (!ret) err("Could not strdup(): %s", strerror(errno));
1234 return ret; 1529 return ret;
1235} 1530}
1236
1237static void *xmalloc(size_t size) 1531static void *xmalloc(size_t size)
1238{ 1532{
1239 void *ret = malloc(size); 1533 void *ret = malloc(size);
1240 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size); 1534 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1241 return ret; 1535 return ret;
1242} 1536}
1243
1244static 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)
1245{ 1538{
1246 size_t new_len; 1539 size_t new_len;
1247 1540
1248 new_len = strlen(*dst) + strlen(src); 1541 new_len = strlen(*dst) + strlen(src);
1249 if (*curr_len <= new_len) { 1542 if (*curr_len <= new_len) {
1250 *curr_len = new_len + (*curr_len / 2); 1543 *curr_len = new_len + (*curr_len / 2);
1251 *dst = realloc(*dst, *curr_len); 1544 *dst = realloc(*dst, *curr_len);
1252 if (!*dst) 1545 if (!*dst)
1253 err("could not realloc %li bytes", (unsigned long)*curr_len); 1546 err("could not realloc() %li bytes", (unsigned long)*curr_len);
1254 } 1547 }
1255 1548
1549 if (n)
1550 strncat(*dst, src, n);
1551 else
1256 strcat(*dst, src); 1552 strcat(*dst, src);
1257} 1553}
1258
1259static 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)
1260{ 1555{
1261 static char my_app[2]; 1556 static char my_app[2];
1262 my_app[0] = append; 1557 my_app[0] = append;
1263 my_app[1] = '\0'; 1558 my_app[1] = '\0';

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