/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.92 Revision 1.164
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 1.92 2005/12/09 01:41:32 vapier Exp $ 4 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.164 2006/12/03 00:17:18 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 1.92 2005/12/09 01:41:32 vapier Exp $"; 12static const char *rcsid = "$Id: scanelf.c,v 1.164 2006/12/03 00:17:18 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 == '#' || c == '+')
28 16
17#define do_state(option, flag) \
18 if (islower(option)) { \
19 flags &= ~PF_##flag; \
20 flags |= PF_NO##flag; \
21 } else { \
22 flags &= ~PF_NO##flag; \
23 flags |= PF_##flag; \
24 }
29 25
30 26
31/* prototypes */ 27/* prototypes */
32static void scanelf_file(const char *filename); 28static int file_matches_list(const char *filename, char **matchlist);
29static int scanelf_elfobj(elfobj *elf);
30static int scanelf_elf(const char *filename, int fd, size_t len);
31static int scanelf_archive(const char *filename, int fd, size_t len);
32static int scanelf_file(const char *filename, const struct stat *st_cache);
33static void scanelf_dir(const char *path); 33static int scanelf_dir(const char *path);
34static void scanelf_ldpath(); 34static void scanelf_ldpath(void);
35static void scanelf_envpath(); 35static void scanelf_envpath(void);
36static void usage(int status); 36static void usage(int status);
37static char **get_split_env(const char *envvar);
38static void parseenv(void);
37static void parseargs(int argc, char *argv[]); 39static int parseargs(int argc, char *argv[]);
38static char *xstrdup(const char *s); 40static char *xstrdup(const char *s);
39static void *xmalloc(size_t size); 41static void *xmalloc(size_t size);
42static void *xrealloc(void *ptr, size_t size);
40static void xstrcat(char **dst, const char *src, size_t *curr_len); 43static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n);
44#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); 45static inline void xchrcat(char **dst, const char append, size_t *curr_len);
42 46
43/* variables to control behavior */ 47/* variables to control behavior */
48static char match_etypes[126] = "";
44static char *ldpaths[256]; 49static char *ldpaths[256];
45static char scan_ldpath = 0; 50static char scan_ldpath = 0;
46static char scan_envpath = 0; 51static char scan_envpath = 0;
47static char scan_symlink = 1; 52static char scan_symlink = 1;
53static char scan_archives = 0;
48static char dir_recurse = 0; 54static char dir_recurse = 0;
49static char dir_crossmount = 1; 55static char dir_crossmount = 1;
50static char show_pax = 0; 56static char show_pax = 0;
51static char show_phdr = 0; 57static char show_phdr = 0;
52static char show_textrel = 0; 58static char show_textrel = 0;
58static char show_textrels = 0; 64static char show_textrels = 0;
59static char show_banner = 1; 65static char show_banner = 1;
60static char be_quiet = 0; 66static char be_quiet = 0;
61static char be_verbose = 0; 67static char be_verbose = 0;
62static char be_wewy_wewy_quiet = 0; 68static char be_wewy_wewy_quiet = 0;
69static char be_semi_verbose = 0;
63static char *find_sym = NULL, *versioned_symname = NULL; 70static char *find_sym = NULL, *versioned_symname = NULL;
64static char *find_lib = NULL; 71static char *find_lib = NULL;
72static char *find_section = NULL;
65static char *out_format = NULL; 73static char *out_format = NULL;
66static char *search_path = NULL; 74static char *search_path = NULL;
75static char fix_elf = 0;
67static char gmatch = 0; 76static char gmatch = 0;
77static char use_ldcache = 0;
78
79static char **qa_textrels = NULL;
80static char **qa_execstack = NULL;
81static char **qa_wx_load = NULL;
82
83int match_bits = 0;
84caddr_t ldcache = 0;
85size_t ldcache_size = 0;
86unsigned long setpax = 0UL;
87
68 88
69 89
70/* sub-funcs for scanelf_file() */ 90/* sub-funcs for scanelf_file() */
71static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab) 91static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
72{ 92{
92 } \ 112 } \
93 } 113 }
94 GET_SYMTABS(32) 114 GET_SYMTABS(32)
95 GET_SYMTABS(64) 115 GET_SYMTABS(64)
96} 116}
117
97static char *scanelf_file_pax(elfobj *elf, char *found_pax) 118static char *scanelf_file_pax(elfobj *elf, char *found_pax)
98{ 119{
99 static char ret[7]; 120 static char ret[7];
100 unsigned long i, shown; 121 unsigned long i, shown;
101 122
110 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 131 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
111 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 132 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
112 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 133 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
113 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \ 134 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
114 continue; \ 135 continue; \
115 if (be_quiet && (EGET(phdr[i].p_flags) == 10240)) \ 136 if (fix_elf && setpax) { \
137 /* set the paxctl flags */ \
138 ESET(phdr[i].p_flags, setpax); \
139 } \
140 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
116 continue; \ 141 continue; \
117 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \ 142 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
118 *found_pax = 1; \ 143 *found_pax = 1; \
119 ++shown; \ 144 ++shown; \
120 break; \ 145 break; \
121 } \ 146 } \
122 } 147 }
123 SHOW_PAX(32) 148 SHOW_PAX(32)
124 SHOW_PAX(64) 149 SHOW_PAX(64)
150 }
151
152
153 if (fix_elf && setpax) {
154 /* set the chpax settings */
155 if (elf->elf_class == ELFCLASS32) {
156 if (EHDR32(elf->ehdr)->e_type == ET_DYN || EHDR32(elf->ehdr)->e_type == ET_EXEC)
157 ESET(EHDR32(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
158 } else {
159 if (EHDR64(elf->ehdr)->e_type == ET_DYN || EHDR64(elf->ehdr)->e_type == ET_EXEC)
160 ESET(EHDR64(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
161 }
125 } 162 }
126 163
127 /* fall back to EI_PAX if no PT_PAX was found */ 164 /* fall back to EI_PAX if no PT_PAX was found */
128 if (!*ret) { 165 if (!*ret) {
129 static char *paxflags; 166 static char *paxflags;
143 180
144static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load) 181static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
145{ 182{
146 static char ret[12]; 183 static char ret[12];
147 char *found; 184 char *found;
148 unsigned long i, shown;
149 unsigned char multi_stack, multi_relro, multi_load; 185 unsigned long i, shown, multi_stack, multi_relro, multi_load;
186 int max_pt_load;
150 187
151 if (!show_phdr) return NULL; 188 if (!show_phdr) return NULL;
152 189
153 memcpy(ret, "--- --- ---\0", 12); 190 memcpy(ret, "--- --- ---\0", 12);
154 191
155 shown = 0; 192 shown = 0;
156 multi_stack = multi_relro = multi_load = 0; 193 multi_stack = multi_relro = multi_load = 0;
194 max_pt_load = elf_max_pt_load(elf);
157 195
196#define NOTE_GNU_STACK ".note.GNU-stack"
158#define SHOW_PHDR(B) \ 197#define SHOW_PHDR(B) \
159 if (elf->elf_class == ELFCLASS ## B) { \ 198 if (elf->elf_class == ELFCLASS ## B) { \
160 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 199 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
161 Elf ## B ## _Off offset; \ 200 Elf ## B ## _Off offset; \
162 uint32_t flags, check_flags; \ 201 uint32_t flags, check_flags; \
163 if (elf->phdr != NULL) { \ 202 if (elf->phdr != NULL) { \
164 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 203 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
165 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \ 204 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
166 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \ 205 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
206 if (multi_stack++) \
167 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \ 207 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
208 if (file_matches_list(elf->filename, qa_execstack)) \
209 continue; \
168 found = found_phdr; \ 210 found = found_phdr; \
169 offset = 0; \ 211 offset = 0; \
170 check_flags = PF_X; \ 212 check_flags = PF_X; \
171 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \ 213 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
214 if (multi_relro++) \
172 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \ 215 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
173 found = found_relro; \ 216 found = found_relro; \
174 offset = 4; \ 217 offset = 4; \
175 check_flags = PF_X; \ 218 check_flags = PF_X; \
176 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \ 219 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
177 if (multi_load++ > 2) warnf("%s: more than 2 PT_LOAD's !?", elf->filename); \ 220 if (ehdr->e_type == ET_DYN || ehdr->e_type == ET_EXEC) \
221 if (multi_load++ > max_pt_load) \
222 warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
223 if (file_matches_list(elf->filename, qa_wx_load)) \
224 continue; \
178 found = found_load; \ 225 found = found_load; \
179 offset = 8; \ 226 offset = 8; \
180 check_flags = PF_W|PF_X; \ 227 check_flags = PF_W|PF_X; \
181 } else \ 228 } else \
182 continue; \ 229 continue; \
183 flags = EGET(phdr[i].p_flags); \ 230 flags = EGET(phdr[i].p_flags); \
184 if (be_quiet && ((flags & check_flags) != check_flags)) \ 231 if (be_quiet && ((flags & check_flags) != check_flags)) \
185 continue; \ 232 continue; \
233 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
234 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
235 ret[3] = ret[7] = '!'; \
236 flags = EGET(phdr[i].p_flags); \
237 } \
186 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \ 238 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
187 *found = 1; \ 239 *found = 1; \
188 ++shown; \ 240 ++shown; \
189 } \ 241 } \
190 } else if (elf->shdr != NULL) { \ 242 } else if (elf->shdr != NULL) { \
191 /* no program headers which means this is prob an object file */ \ 243 /* no program headers which means this is prob an object file */ \
192 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \ 244 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
193 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \ 245 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
246 char *str; \
247 if ((void*)strtbl > (void*)elf->data_end) \
248 goto skip_this_shdr##B; \
194 check_flags = SHF_WRITE|SHF_EXECINSTR; \ 249 check_flags = SHF_WRITE|SHF_EXECINSTR; \
195 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \ 250 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
196 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \ 251 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
197 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \ 252 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
198 if (!strcmp((char*)(elf->data + offset), ".note.GNU-stack")) { \ 253 str = elf->data + offset; \
254 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
255 if (!strcmp(str, NOTE_GNU_STACK)) { \
199 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \ 256 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
200 flags = EGET(shdr[i].sh_flags); \ 257 flags = EGET(shdr[i].sh_flags); \
201 if (be_quiet && ((flags & check_flags) != check_flags)) \ 258 if (be_quiet && ((flags & check_flags) != check_flags)) \
202 continue; \ 259 continue; \
203 ++*found_phdr; \ 260 ++*found_phdr; \
207 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \ 264 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
208 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \ 265 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
209 break; \ 266 break; \
210 } \ 267 } \
211 } \ 268 } \
269 skip_this_shdr##B: \
212 if (!multi_stack) { \ 270 if (!multi_stack) { \
271 if (file_matches_list(elf->filename, qa_execstack)) \
272 return NULL; \
213 *found_phdr = 1; \ 273 *found_phdr = 1; \
214 shown = 1; \ 274 shown = 1; \
215 memcpy(ret, "!WX", 3); \ 275 memcpy(ret, "!WX", 3); \
216 } \ 276 } \
217 } \ 277 } \
222 if (be_wewy_wewy_quiet || (be_quiet && !shown)) 282 if (be_wewy_wewy_quiet || (be_quiet && !shown))
223 return NULL; 283 return NULL;
224 else 284 else
225 return ret; 285 return ret;
226} 286}
287
227static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 288static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
228{ 289{
229 static const char *ret = "TEXTREL"; 290 static const char *ret = "TEXTREL";
230 unsigned long i; 291 unsigned long i;
231 292
232 if (!show_textrel && !show_textrels) return NULL; 293 if (!show_textrel && !show_textrels) return NULL;
294
295 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
233 296
234 if (elf->phdr) { 297 if (elf->phdr) {
235#define SHOW_TEXTREL(B) \ 298#define SHOW_TEXTREL(B) \
236 if (elf->elf_class == ELFCLASS ## B) { \ 299 if (elf->elf_class == ELFCLASS ## B) { \
237 Elf ## B ## _Dyn *dyn; \ 300 Elf ## B ## _Dyn *dyn; \
320 if (be_verbose <= 2) continue; \ 383 if (be_verbose <= 2) continue; \
321 } else \ 384 } else \
322 *found_textrels = 1; \ 385 *found_textrels = 1; \
323 /* locate this relocation symbol name */ \ 386 /* locate this relocation symbol name */ \
324 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 387 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
388 if ((void*)sym > (void*)elf->data_end) { \
389 warn("%s: corrupt ELF symbol", elf->filename); \
390 continue; \
391 } \
325 sym_max = ELF ## B ## _R_SYM(r_info); \ 392 sym_max = ELF ## B ## _R_SYM(r_info); \
326 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \ 393 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
327 sym += sym_max; \ 394 sym += sym_max; \
328 else \ 395 else \
329 sym = NULL; \ 396 sym = NULL; \
361 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename); 428 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
362 429
363 return NULL; 430 return NULL;
364} 431}
365 432
366static void rpath_security_checks(elfobj *, char *); 433static void rpath_security_checks(elfobj *, char *, const char *);
367static void rpath_security_checks(elfobj *elf, char *item) { 434static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
435{
368 struct stat st; 436 struct stat st;
369 switch (*item) { 437 switch (*item) {
370 case '/': break; 438 case '/': break;
371 case '.': 439 case '.':
372 warnf("Security problem with relative RPATH '%s' in %s", item, elf->filename); 440 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
373 break; 441 break;
442 case ':':
374 case '\0': 443 case '\0':
375 warnf("Security problem NULL RPATH in %s", elf->filename); 444 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
376 break; 445 break;
377 case '$': 446 case '$':
378 if (fstat(elf->fd, &st) != -1) 447 if (fstat(elf->fd, &st) != -1)
379 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID)) 448 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", 449 warnf("Security problem with %s='%s' in %s with mode set of %o",
381 item, elf->filename, st.st_mode & 07777); 450 dt_type, item, elf->filename, st.st_mode & 07777);
382 break; 451 break;
383 default: 452 default:
384 warnf("Maybe? sec problem with RPATH='%s' in %s", item, elf->filename); 453 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
385 break; 454 break;
386 } 455 }
387} 456}
388static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len) 457static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
389{ 458{
425 /* Verify the memory is somewhat sane */ \ 494 /* Verify the memory is somewhat sane */ \
426 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 495 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
427 if (offset < (Elf ## B ## _Off)elf->len) { \ 496 if (offset < (Elf ## B ## _Off)elf->len) { \
428 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \ 497 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
429 *r = (char*)(elf->data + offset); \ 498 *r = (char*)(elf->data + offset); \
499 /* cache the length in case we need to nuke this section later on */ \
500 if (fix_elf) \
501 offset = strlen(*r); \
430 /* If quiet, don't output paths in ld.so.conf */ \ 502 /* If quiet, don't output paths in ld.so.conf */ \
431 if (be_quiet) { \ 503 if (be_quiet) { \
432 size_t len; \ 504 size_t len; \
433 char *start, *end; \ 505 char *start, *end; \
434 /* note that we only 'chop' off leading known paths. */ \ 506 /* note that we only 'chop' off leading known paths. */ \
435 /* since *r is read-only memory, we can only move the ptr forward. */ \ 507 /* since *r is read-only memory, we can only move the ptr forward. */ \
436 start = *r; \ 508 start = *r; \
437 /* scan each path in : delimited list */ \ 509 /* scan each path in : delimited list */ \
438 while (start) { \ 510 while (start) { \
439 rpath_security_checks(elf, start); \ 511 rpath_security_checks(elf, start, get_elfdtype(word)); \
440 end = strchr(start, ':'); \ 512 end = strchr(start, ':'); \
441 len = (end ? abs(end - start) : strlen(start)); \ 513 len = (end ? abs(end - start) : strlen(start)); \
514 if (use_ldcache) \
442 for (s = 0; ldpaths[s]; ++s) { \ 515 for (s = 0; ldpaths[s]; ++s) \
443 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \ 516 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
444 *r = (end ? end + 1 : NULL); \ 517 *r = end; \
518 /* corner case ... if RPATH reads "/usr/lib:", we want \
519 * to show ':' rather than '' */ \
520 if (end && end[1] != '\0') \
521 (*r)++; \
445 break; \ 522 break; \
446 } \ 523 } \
447 } \
448 if (!*r || !ldpaths[s] || !end) \ 524 if (!*r || !end) \
449 start = NULL; \ 525 break; \
450 else \ 526 else \
451 start = start + len + 1; \ 527 start = start + len + 1; \
452 } \ 528 } \
453 } \ 529 } \
530 if (*r) { \
531 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
532 /* just nuke it */ \
533 nuke_it##B: \
534 memset(*r, 0x00, offset); \
535 *r = NULL; \
536 ESET(dyn->d_tag, DT_DEBUG); \
537 ESET(dyn->d_un.d_ptr, 0); \
538 } else if (fix_elf) { \
539 /* try to clean "bad" paths */ \
540 size_t len, tmpdir_len; \
541 char *start, *end; \
542 const char *tmpdir; \
543 start = *r; \
544 tmpdir = (getenv("TMPDIR") ? : "."); \
545 tmpdir_len = strlen(tmpdir); \
546 while (1) { \
547 end = strchr(start, ':'); \
548 if (start == end) { \
549 eat_this_path##B: \
550 len = strlen(end); \
551 memmove(start, end+1, len); \
552 start[len-1] = '\0'; \
553 end = start - 1; \
554 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
555 if (!end) { \
556 if (start == *r) \
557 goto nuke_it##B; \
558 *--start = '\0'; \
559 } else \
560 goto eat_this_path##B; \
561 } \
562 if (!end) \
563 break; \
564 start = end + 1; \
565 } \
566 if (**r == '\0') \
567 goto nuke_it##B; \
568 } \
569 if (*r) \
454 if (*r) *found_rpath = 1; \ 570 *found_rpath = 1; \
571 } \
455 } \ 572 } \
456 ++dyn; \ 573 ++dyn; \
457 } \ 574 } \
458 } } 575 } }
459 SHOW_RPATH(32) 576 SHOW_RPATH(32)
476 } else if (rpath || runpath) 593 } else if (rpath || runpath)
477 xstrcat(ret, (runpath ? runpath : rpath), ret_len); 594 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
478 else if (!be_quiet) 595 else if (!be_quiet)
479 xstrcat(ret, " - ", ret_len); 596 xstrcat(ret, " - ", ret_len);
480} 597}
598
599#define LDSO_CACHE_MAGIC "ld.so-"
600#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
601#define LDSO_CACHE_VER "1.7.0"
602#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
603#define FLAG_ANY -1
604#define FLAG_TYPE_MASK 0x00ff
605#define FLAG_LIBC4 0x0000
606#define FLAG_ELF 0x0001
607#define FLAG_ELF_LIBC5 0x0002
608#define FLAG_ELF_LIBC6 0x0003
609#define FLAG_REQUIRED_MASK 0xff00
610#define FLAG_SPARC_LIB64 0x0100
611#define FLAG_IA64_LIB64 0x0200
612#define FLAG_X8664_LIB64 0x0300
613#define FLAG_S390_LIB64 0x0400
614#define FLAG_POWERPC_LIB64 0x0500
615#define FLAG_MIPS64_LIBN32 0x0600
616#define FLAG_MIPS64_LIBN64 0x0700
617
618static char *lookup_cache_lib(elfobj *, char *);
619
620#if defined(__GLIBC__) || defined(__UCLIBC__)
621
622static char *lookup_cache_lib(elfobj *elf, char *fname)
623{
624 int fd = 0;
625 char *strs;
626 static char buf[__PAX_UTILS_PATH_MAX] = "";
627 const char *cachefile = "/etc/ld.so.cache";
628 struct stat st;
629
630 typedef struct {
631 char magic[LDSO_CACHE_MAGIC_LEN];
632 char version[LDSO_CACHE_VER_LEN];
633 int nlibs;
634 } header_t;
635 header_t *header;
636
637 typedef struct {
638 int flags;
639 int sooffset;
640 int liboffset;
641 } libentry_t;
642 libentry_t *libent;
643
644 if (fname == NULL)
645 return NULL;
646
647 if (ldcache == 0) {
648 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1)
649 return NULL;
650
651 /* cache these values so we only map/unmap the cache file once */
652 ldcache_size = st.st_size;
653 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
654
655 close(fd);
656
657 if (ldcache == (caddr_t)-1) {
658 ldcache = 0;
659 return NULL;
660 }
661
662 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
663 return NULL;
664 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
665 return NULL;
666 }
667
668 header = (header_t *) ldcache;
669 libent = (libentry_t *) (ldcache + sizeof(header_t));
670 strs = (char *) &libent[header->nlibs];
671
672 for (fd = 0; fd < header->nlibs; fd++) {
673 /* this should be more fine grained, but for now we assume that
674 * diff arches will not be cached together. and we ignore the
675 * the different multilib mips cases. */
676 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
677 continue;
678 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
679 continue;
680
681 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
682 continue;
683 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
684 }
685 return buf;
686}
687#elif defined(__NetBSD__)
688static char *lookup_cache_lib(elfobj *elf, char *fname)
689{
690 static char buf[__PAX_UTILS_PATH_MAX] = "";
691 static struct stat st;
692
693 char **ldpath;
694 for (ldpath = ldpaths; *ldpath != NULL; ldpath++) {
695 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", *ldpath, fname) >= sizeof(buf))
696 continue; /* if the pathname is too long, or something went wrong, ignore */
697
698 if (stat(buf, &st) != 0)
699 continue; /* if the lib doesn't exist in *ldpath, look further */
700
701 /* NetBSD doesn't actually do sanity checks, it just loads the file
702 * and if that doesn't work, continues looking in other directories.
703 * This cannot easily be safely emulated, unfortunately. For now,
704 * just assume that if it exists, it's a valid library. */
705
706 return buf;
707 }
708
709 /* not found in any path */
710 return NULL;
711}
712#else
713#warning Cache support not implemented for your target
714static char *lookup_cache_lib(elfobj *elf, char *fname)
715{
716 return NULL;
717}
718#endif
719
481static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len) 720static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
482{ 721{
483 unsigned long i; 722 unsigned long i;
484 char *needed; 723 char *needed;
485 void *strtbl_void; 724 void *strtbl_void;
725 char *p;
486 726
487 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL; 727 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
488 728
489 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 729 strtbl_void = elf_findsecbyname(elf, ".dynstr");
490 730
510 } \ 750 } \
511 needed = (char*)(elf->data + offset); \ 751 needed = (char*)(elf->data + offset); \
512 if (op == 0) { \ 752 if (op == 0) { \
513 if (!be_wewy_wewy_quiet) { \ 753 if (!be_wewy_wewy_quiet) { \
514 if (*found_needed) xchrcat(ret, ',', ret_len); \ 754 if (*found_needed) xchrcat(ret, ',', ret_len); \
755 if (use_ldcache) \
756 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
757 needed = p; \
515 xstrcat(ret, needed, ret_len); \ 758 xstrcat(ret, needed, ret_len); \
516 } \ 759 } \
517 *found_needed = 1; \ 760 *found_needed = 1; \
518 } else { \ 761 } else { \
519 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \ 762 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \
555} 798}
556static char *scanelf_file_bind(elfobj *elf, char *found_bind) 799static char *scanelf_file_bind(elfobj *elf, char *found_bind)
557{ 800{
558 unsigned long i; 801 unsigned long i;
559 struct stat s; 802 struct stat s;
803 char dynamic = 0;
560 804
561 if (!show_bind) return NULL; 805 if (!show_bind) return NULL;
562 if (!elf->phdr) return NULL; 806 if (!elf->phdr) return NULL;
563 807
564#define SHOW_BIND(B) \ 808#define SHOW_BIND(B) \
567 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 811 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
568 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 812 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
569 Elf ## B ## _Off offset; \ 813 Elf ## B ## _Off offset; \
570 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 814 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
571 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 815 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
816 dynamic = 1; \
572 offset = EGET(phdr[i].p_offset); \ 817 offset = EGET(phdr[i].p_offset); \
573 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 818 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
574 dyn = DYN ## B (elf->data + offset); \ 819 dyn = DYN ## B (elf->data + offset); \
575 while (EGET(dyn->d_tag) != DT_NULL) { \ 820 while (EGET(dyn->d_tag) != DT_NULL) { \
576 if (EGET(dyn->d_tag) == DT_BIND_NOW || \ 821 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
587 SHOW_BIND(32) 832 SHOW_BIND(32)
588 SHOW_BIND(64) 833 SHOW_BIND(64)
589 834
590 if (be_wewy_wewy_quiet) return NULL; 835 if (be_wewy_wewy_quiet) return NULL;
591 836
837 /* don't output anything if quiet mode and the ELF is static or not setuid */
592 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) { 838 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
593 return NULL; 839 return NULL;
594 } else { 840 } else {
595 *found_bind = 1; 841 *found_bind = 1;
596 return (char *) "LAZY"; 842 return (char *) (dynamic ? "LAZY" : "STATIC");
597 } 843 }
598} 844}
599static char *scanelf_file_soname(elfobj *elf, char *found_soname) 845static char *scanelf_file_soname(elfobj *elf, char *found_soname)
600{ 846{
601 unsigned long i; 847 unsigned long i;
643 return NULL; 889 return NULL;
644} 890}
645static char *scanelf_file_sym(elfobj *elf, char *found_sym) 891static char *scanelf_file_sym(elfobj *elf, char *found_sym)
646{ 892{
647 unsigned long i; 893 unsigned long i;
894 char *ret;
648 void *symtab_void, *strtab_void; 895 void *symtab_void, *strtab_void;
649 896
650 if (!find_sym) return NULL; 897 if (!find_sym) return NULL;
898 ret = find_sym;
651 899
652 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void); 900 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
653 901
654 if (symtab_void && strtab_void) { 902 if (symtab_void && strtab_void) {
655#define FIND_SYM(B) \ 903#define FIND_SYM(B) \
656 if (elf->elf_class == ELFCLASS ## B) { \ 904 if (elf->elf_class == ELFCLASS ## B) { \
657 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 905 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
658 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 906 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
659 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 907 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
660 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 908 unsigned long cnt = EGET(symtab->sh_entsize); \
661 char *symname; \ 909 char *symname; \
910 if (cnt) \
911 cnt = EGET(symtab->sh_size) / cnt; \
662 for (i = 0; i < cnt; ++i) { \ 912 for (i = 0; i < cnt; ++i) { \
663 if (sym->st_name) { \ 913 if (sym->st_name) { \
914 /* make sure the symbol name is in acceptable memory range */ \
664 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 915 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
916 if ((void*)symname > (void*)elf->data_end) { \
917 warnf("%s: corrupt ELF symbols", elf->filename); \
918 ++sym; \
919 continue; \
920 } \
921 /* debug display ... show all symbols and some extra info */ \
665 if (*find_sym == '*') { \ 922 if (*ret == '*') { \
666 printf("%s(%s) %5lX %15s %s\n", \ 923 printf("%s(%s) %5lX %15s %s\n", \
667 ((*found_sym == 0) ? "\n\t" : "\t"), \ 924 ((*found_sym == 0) ? "\n\t" : "\t"), \
668 elf->base_filename, \ 925 elf->base_filename, \
669 (long)sym->st_size, \ 926 (unsigned long)sym->st_size, \
670 (char *)get_elfstttype(sym->st_info), \ 927 get_elfstttype(sym->st_info), \
671 symname); \ 928 symname); \
672 *found_sym = 1; \ 929 *found_sym = 1; \
673 } else if ((strcmp(find_sym, symname) == 0) || \ 930 } else { \
674 (strcmp(symname, versioned_symname) == 0)) \ 931 /* allow the user to specify a comma delimited list of symbols to search for */ \
932 char *this_sym, *this_sym_ver, *next_sym; \
933 this_sym = ret; \
934 this_sym_ver = versioned_symname; \
935 do { \
936 next_sym = strchr(this_sym, ','); \
937 if (next_sym == NULL) \
938 next_sym = this_sym + strlen(this_sym); \
939 /* do we want a defined symbol ? */ \
940 if (*this_sym == '+') { \
941 if (sym->st_shndx == SHN_UNDEF) \
942 goto skip_this_sym##B; \
943 ++this_sym; \
944 ++this_sym_ver; \
945 /* do we want an undefined symbol ? */ \
946 } else if (*this_sym == '-') { \
947 if (sym->st_shndx != SHN_UNDEF) \
948 goto skip_this_sym##B; \
949 ++this_sym; \
950 ++this_sym_ver; \
951 } \
952 /* ok, lets compare the name now */ \
953 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
954 (strncmp(this_sym_ver, symname, strlen(this_sym_ver)) == 0)) { \
955 if (be_semi_verbose) { \
956 char buf[126]; \
957 snprintf(buf, sizeof(buf), "%lX %s %s", \
958 (unsigned long)sym->st_size, get_elfstttype(sym->st_info), this_sym); \
959 ret = buf; \
960 } else \
961 ret = this_sym; \
675 (*found_sym)++; \ 962 (*found_sym)++; \
963 goto break_out; \
964 } \
965 skip_this_sym##B: this_sym = next_sym + 1; \
966 } while (*next_sym != '\0'); \
967 } \
676 } \ 968 } \
677 ++sym; \ 969 ++sym; \
678 } } 970 } }
679 FIND_SYM(32) 971 FIND_SYM(32)
680 FIND_SYM(64) 972 FIND_SYM(64)
681 } 973 }
682 974
975break_out:
683 if (be_wewy_wewy_quiet) return NULL; 976 if (be_wewy_wewy_quiet) return NULL;
684 977
685 if (*find_sym != '*' && *found_sym) 978 if (*find_sym != '*' && *found_sym)
686 return find_sym; 979 return ret;
687 if (be_quiet) 980 if (be_quiet)
688 return NULL; 981 return NULL;
689 else 982 else
690 return (char *)" - "; 983 return (char *)" - ";
691} 984}
985
986
987static char *scanelf_file_sections(elfobj *elf, char *found_section)
988{
989 if (!find_section)
990 return NULL;
991
992#define FIND_SECTION(B) \
993 if (elf->elf_class == ELFCLASS ## B) { \
994 int invert; \
995 Elf ## B ## _Shdr *section; \
996 invert = (*find_section == '!' ? 1 : 0); \
997 section = SHDR ## B (elf_findsecbyname(elf, find_section+invert)); \
998 if ((section == NULL && invert) || (section != NULL && !invert)) \
999 *found_section = 1; \
1000 }
1001 FIND_SECTION(32)
1002 FIND_SECTION(64)
1003
1004 if (be_wewy_wewy_quiet)
1005 return NULL;
1006
1007 if (*found_section)
1008 return find_section;
1009
1010 if (be_quiet)
1011 return NULL;
1012 else
1013 return (char *)" - ";
1014}
1015
692/* scan an elf file and show all the fun stuff */ 1016/* scan an elf file and show all the fun stuff */
693#define prints(str) write(fileno(stdout), str, strlen(str)) 1017#define prints(str) write(fileno(stdout), str, strlen(str))
694static void scanelf_file(const char *filename) 1018static int scanelf_elfobj(elfobj *elf)
695{ 1019{
696 unsigned long i; 1020 unsigned long i;
697 char found_pax, found_phdr, found_relro, found_load, found_textrel, 1021 char found_pax, found_phdr, found_relro, found_load, found_textrel,
698 found_rpath, found_needed, found_interp, found_bind, found_soname, 1022 found_rpath, found_needed, found_interp, found_bind, found_soname,
699 found_sym, found_lib, found_file, found_textrels; 1023 found_sym, found_lib, found_file, found_textrels, found_section;
700 elfobj *elf;
701 struct stat st;
702 static char *out_buffer = NULL; 1024 static char *out_buffer = NULL;
703 static size_t out_len; 1025 static size_t out_len;
704 1026
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
720 found_pax = found_phdr = found_relro = found_load = found_textrel = \ 1027 found_pax = found_phdr = found_relro = found_load = found_textrel = \
721 found_rpath = found_needed = found_interp = found_bind = found_soname = \ 1028 found_rpath = found_needed = found_interp = found_bind = found_soname = \
722 found_sym = found_lib = found_file = found_textrels = 0; 1029 found_sym = found_lib = found_file = found_textrels = found_section = 0;
723 1030
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) 1031 if (be_verbose > 2)
731 printf("%s: scanning file {%s,%s}\n", filename, 1032 printf("%s: scanning file {%s,%s}\n", elf->filename,
732 get_elfeitype(EI_CLASS, elf->elf_class), 1033 get_elfeitype(EI_CLASS, elf->elf_class),
733 get_elfeitype(EI_DATA, elf->data[EI_DATA])); 1034 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
734 else if (be_verbose) 1035 else if (be_verbose > 1)
735 printf("%s: scanning file\n", filename); 1036 printf("%s: scanning file\n", elf->filename);
736 1037
737 /* init output buffer */ 1038 /* init output buffer */
738 if (!out_buffer) { 1039 if (!out_buffer) {
739 out_len = sizeof(char) * 80; 1040 out_len = sizeof(char) * 80;
740 out_buffer = (char*)xmalloc(out_len); 1041 out_buffer = (char*)xmalloc(out_len);
745 if (!be_quiet && show_banner) { 1046 if (!be_quiet && show_banner) {
746 for (i = 0; out_format[i]; ++i) { 1047 for (i = 0; out_format[i]; ++i) {
747 if (!IS_MODIFIER(out_format[i])) continue; 1048 if (!IS_MODIFIER(out_format[i])) continue;
748 1049
749 switch (out_format[++i]) { 1050 switch (out_format[++i]) {
1051 case '+': break;
750 case '%': break; 1052 case '%': break;
751 case '#': break; 1053 case '#': break;
752 case 'F': 1054 case 'F':
753 case 'p': 1055 case 'p':
754 case 'f': prints("FILE "); found_file = 1; break; 1056 case 'f': prints("FILE "); found_file = 1; break;
762 case 'b': prints("BIND "); break; 1064 case 'b': prints("BIND "); break;
763 case 'S': prints("SONAME "); break; 1065 case 'S': prints("SONAME "); break;
764 case 's': prints("SYM "); break; 1066 case 's': prints("SYM "); break;
765 case 'N': prints("LIB "); break; 1067 case 'N': prints("LIB "); break;
766 case 'T': prints("TEXTRELS "); break; 1068 case 'T': prints("TEXTRELS "); break;
1069 case 'k': prints("SECTION "); break;
767 default: warnf("'%c' has no title ?", out_format[i]); 1070 default: warnf("'%c' has no title ?", out_format[i]);
768 } 1071 }
769 } 1072 }
770 if (!found_file) prints("FILE "); 1073 if (!found_file) prints("FILE ");
771 prints("\n"); 1074 prints("\n");
776 /* dump all the good stuff */ 1079 /* dump all the good stuff */
777 for (i = 0; out_format[i]; ++i) { 1080 for (i = 0; out_format[i]; ++i) {
778 const char *out; 1081 const char *out;
779 const char *tmp; 1082 const char *tmp;
780 1083
781 /* make sure we trim leading spaces in quiet mode */
782 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
783 *out_buffer = '\0';
784
785 if (!IS_MODIFIER(out_format[i])) { 1084 if (!IS_MODIFIER(out_format[i])) {
786 xchrcat(&out_buffer, out_format[i], &out_len); 1085 xchrcat(&out_buffer, out_format[i], &out_len);
787 continue; 1086 continue;
788 } 1087 }
789 1088
790 out = NULL; 1089 out = NULL;
791 be_wewy_wewy_quiet = (out_format[i] == '#'); 1090 be_wewy_wewy_quiet = (out_format[i] == '#');
1091 be_semi_verbose = (out_format[i] == '+');
792 switch (out_format[++i]) { 1092 switch (out_format[++i]) {
1093 case '+':
793 case '%': 1094 case '%':
794 case '#': 1095 case '#':
795 xchrcat(&out_buffer, out_format[i], &out_len); break; 1096 xchrcat(&out_buffer, out_format[i], &out_len); break;
796 case 'F': 1097 case 'F':
797 found_file = 1; 1098 found_file = 1;
798 if (be_wewy_wewy_quiet) break; 1099 if (be_wewy_wewy_quiet) break;
799 xstrcat(&out_buffer, filename, &out_len); 1100 xstrcat(&out_buffer, elf->filename, &out_len);
800 break; 1101 break;
801 case 'p': 1102 case 'p':
802 found_file = 1; 1103 found_file = 1;
803 if (be_wewy_wewy_quiet) break; 1104 if (be_wewy_wewy_quiet) break;
804 tmp = filename; 1105 tmp = elf->filename;
805 if (search_path) { 1106 if (search_path) {
806 ssize_t len_search = strlen(search_path); 1107 ssize_t len_search = strlen(search_path);
807 ssize_t len_file = strlen(filename); 1108 ssize_t len_file = strlen(elf->filename);
808 if (!strncmp(filename, search_path, len_search) && \ 1109 if (!strncmp(elf->filename, search_path, len_search) && \
809 len_file > len_search) 1110 len_file > len_search)
810 tmp += len_search; 1111 tmp += len_search;
811 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++; 1112 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
812 } 1113 }
813 xstrcat(&out_buffer, tmp, &out_len); 1114 xstrcat(&out_buffer, tmp, &out_len);
814 break; 1115 break;
815 case 'f': 1116 case 'f':
816 found_file = 1; 1117 found_file = 1;
817 if (be_wewy_wewy_quiet) break; 1118 if (be_wewy_wewy_quiet) break;
818 tmp = strrchr(filename, '/'); 1119 tmp = strrchr(elf->filename, '/');
819 tmp = (tmp == NULL ? filename : tmp+1); 1120 tmp = (tmp == NULL ? elf->filename : tmp+1);
820 xstrcat(&out_buffer, tmp, &out_len); 1121 xstrcat(&out_buffer, tmp, &out_len);
821 break; 1122 break;
822 case 'o': out = get_elfetype(elf); break; 1123 case 'o': out = get_elfetype(elf); break;
823 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1124 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; 1125 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
829 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break; 1130 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
830 case 'i': out = scanelf_file_interp(elf, &found_interp); break; 1131 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
831 case 'b': out = scanelf_file_bind(elf, &found_bind); break; 1132 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
832 case 'S': out = scanelf_file_soname(elf, &found_soname); break; 1133 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
833 case 's': out = scanelf_file_sym(elf, &found_sym); break; 1134 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1135 case 'k': out = scanelf_file_sections(elf, &found_section); break;
834 default: warnf("'%c' has no scan code?", out_format[i]); 1136 default: warnf("'%c' has no scan code?", out_format[i]);
835 } 1137 }
1138 if (out) {
1139 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
1140 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
1141 xstrncat(&out_buffer, out, &out_len, (tmp-out));
1142 else
836 if (out) xstrcat(&out_buffer, out, &out_len); 1143 xstrcat(&out_buffer, out, &out_len);
1144 }
837 } 1145 }
838 1146
839#define FOUND_SOMETHING() \ 1147#define FOUND_SOMETHING() \
840 (found_pax || found_phdr || found_relro || found_load || found_textrel || \ 1148 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
841 found_rpath || found_needed || found_interp || found_bind || \ 1149 found_rpath || found_needed || found_interp || found_bind || \
842 found_soname || found_sym || found_lib || found_textrels) 1150 found_soname || found_sym || found_lib || found_textrels || found_section )
843 1151
844 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) { 1152 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
845 xchrcat(&out_buffer, ' ', &out_len); 1153 xchrcat(&out_buffer, ' ', &out_len);
846 xstrcat(&out_buffer, filename, &out_len); 1154 xstrcat(&out_buffer, elf->filename, &out_len);
847 } 1155 }
848 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) { 1156 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
849 puts(out_buffer); 1157 puts(out_buffer);
850 fflush(stdout); 1158 fflush(stdout);
851 } 1159 }
852 1160
1161 return 0;
1162}
1163
1164/* scan a single elf */
1165static int scanelf_elf(const char *filename, int fd, size_t len)
1166{
1167 int ret = 1;
1168 elfobj *elf;
1169
1170 /* verify this is real ELF */
1171 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1172 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1173 return ret;
1174 }
1175 switch (match_bits) {
1176 case 32:
1177 if (elf->elf_class != ELFCLASS32)
1178 goto label_done;
1179 break;
1180 case 64:
1181 if (elf->elf_class != ELFCLASS64)
1182 goto label_done;
1183 break;
1184 default: break;
1185 }
1186 if (strlen(match_etypes)) {
1187 char sbuf[126];
1188 strncpy(sbuf, match_etypes, sizeof(sbuf));
1189 if (strchr(match_etypes, ',') != NULL) {
1190 char *p;
1191 while((p = strrchr(sbuf, ',')) != NULL) {
1192 *p = 0;
1193 if (etype_lookup(p+1) == get_etype(elf))
1194 goto label_ret;
1195 }
1196 }
1197 if (etype_lookup(sbuf) != get_etype(elf))
1198 goto label_done;
1199 }
1200
1201label_ret:
1202 ret = scanelf_elfobj(elf);
1203
1204label_done:
853 unreadelf(elf); 1205 unreadelf(elf);
1206 return ret;
1207}
1208
1209/* scan an archive of elfs */
1210static int scanelf_archive(const char *filename, int fd, size_t len)
1211{
1212 archive_handle *ar;
1213 archive_member *m;
1214 char *ar_buffer;
1215 elfobj *elf;
1216
1217 ar = ar_open_fd(filename, fd);
1218 if (ar == NULL)
1219 return 1;
1220
1221 ar_buffer = (char*)mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1222 while ((m=ar_next(ar)) != NULL) {
1223 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size);
1224 if (elf) {
1225 scanelf_elfobj(elf);
1226 unreadelf(elf);
1227 }
1228 }
1229 munmap(ar_buffer, len);
1230
1231 return 0;
1232}
1233/* scan a file which may be an elf or an archive or some other magical beast */
1234static int scanelf_file(const char *filename, const struct stat *st_cache)
1235{
1236 const struct stat *st = st_cache;
1237 struct stat symlink_st;
1238 int fd;
1239
1240 /* always handle regular files and handle symlinked files if no -y */
1241 if (S_ISLNK(st->st_mode)) {
1242 if (!scan_symlink) return 1;
1243 stat(filename, &symlink_st);
1244 st = &symlink_st;
1245 }
1246
1247 if (!S_ISREG(st->st_mode)) {
1248 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1249 return 1;
1250 }
1251
1252 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1253 return 1;
1254
1255 if (scanelf_elf(filename, fd, st->st_size) == 1 && scan_archives)
1256 /* if it isn't an ELF, maybe it's an .a archive */
1257 scanelf_archive(filename, fd, st->st_size);
1258
1259 close(fd);
1260 return 0;
854} 1261}
855 1262
856/* scan a directory for ET_EXEC files and print when we find one */ 1263/* scan a directory for ET_EXEC files and print when we find one */
857static void scanelf_dir(const char *path) 1264static int scanelf_dir(const char *path)
858{ 1265{
859 register DIR *dir; 1266 register DIR *dir;
860 register struct dirent *dentry; 1267 register struct dirent *dentry;
861 struct stat st_top, st; 1268 struct stat st_top, st;
862 char buf[_POSIX_PATH_MAX]; 1269 char buf[__PAX_UTILS_PATH_MAX];
863 size_t pathlen = 0, len = 0; 1270 size_t pathlen = 0, len = 0;
1271 int ret = 0;
864 1272
865 /* make sure path exists */ 1273 /* make sure path exists */
866 if (lstat(path, &st_top) == -1) { 1274 if (lstat(path, &st_top) == -1) {
867 if (be_verbose > 2) printf("%s: does not exist\n", path); 1275 if (be_verbose > 2) printf("%s: does not exist\n", path);
868 return; 1276 return 1;
869 } 1277 }
870 1278
871 /* ok, if it isn't a directory, assume we can open it */ 1279 /* ok, if it isn't a directory, assume we can open it */
872 if (!S_ISDIR(st_top.st_mode)) { 1280 if (!S_ISDIR(st_top.st_mode)) {
873 scanelf_file(path); 1281 return scanelf_file(path, &st_top);
874 return;
875 } 1282 }
876 1283
877 /* now scan the dir looking for fun stuff */ 1284 /* now scan the dir looking for fun stuff */
878 if ((dir = opendir(path)) == NULL) { 1285 if ((dir = opendir(path)) == NULL) {
879 warnf("could not opendir %s: %s", path, strerror(errno)); 1286 warnf("could not opendir %s: %s", path, strerror(errno));
880 return; 1287 return 1;
881 } 1288 }
882 if (be_verbose) printf("%s: scanning dir\n", path); 1289 if (be_verbose > 1) printf("%s: scanning dir\n", path);
883 1290
884 pathlen = strlen(path); 1291 pathlen = strlen(path);
885 while ((dentry = readdir(dir))) { 1292 while ((dentry = readdir(dir))) {
886 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1293 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
887 continue; 1294 continue;
889 if (len >= sizeof(buf)) { 1296 if (len >= sizeof(buf)) {
890 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path, 1297 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
891 (unsigned long)len, (unsigned long)sizeof(buf)); 1298 (unsigned long)len, (unsigned long)sizeof(buf));
892 continue; 1299 continue;
893 } 1300 }
894 sprintf(buf, "%s/%s", path, dentry->d_name); 1301 snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name);
895 if (lstat(buf, &st) != -1) { 1302 if (lstat(buf, &st) != -1) {
896 if (S_ISREG(st.st_mode)) 1303 if (S_ISREG(st.st_mode))
897 scanelf_file(buf); 1304 ret = scanelf_file(buf, &st);
898 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1305 else if (dir_recurse && S_ISDIR(st.st_mode)) {
899 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1306 if (dir_crossmount || (st_top.st_dev == st.st_dev))
900 scanelf_dir(buf); 1307 ret = scanelf_dir(buf);
901 } 1308 }
902 } 1309 }
903 } 1310 }
904 closedir(dir); 1311 closedir(dir);
1312 return ret;
905} 1313}
906 1314
907static int scanelf_from_file(char *filename) 1315static int scanelf_from_file(const char *filename)
908{ 1316{
909 FILE *fp = NULL; 1317 FILE *fp = NULL;
910 char *p; 1318 char *p;
911 char path[_POSIX_PATH_MAX]; 1319 char path[__PAX_UTILS_PATH_MAX];
1320 int ret = 0;
912 1321
913 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL)) 1322 if (strcmp(filename, "-") == 0)
914 fp = stdin; 1323 fp = stdin;
915 else if ((fp = fopen(filename, "r")) == NULL) 1324 else if ((fp = fopen(filename, "r")) == NULL)
916 return 1; 1325 return 1;
917 1326
918 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1327 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
919 if ((p = strchr(path, '\n')) != NULL) 1328 if ((p = strchr(path, '\n')) != NULL)
920 *p = 0; 1329 *p = 0;
921 search_path = path; 1330 search_path = path;
922 scanelf_dir(path); 1331 ret = scanelf_dir(path);
923 } 1332 }
924 if (fp != stdin) 1333 if (fp != stdin)
925 fclose(fp); 1334 fclose(fp);
926 return 0; 1335 return ret;
927} 1336}
928 1337
929static void load_ld_so_conf() 1338#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1339
1340static int load_ld_cache_config(int i, const char *fname)
930{ 1341{
931 FILE *fp = NULL; 1342 FILE *fp = NULL;
932 char *p; 1343 char *p;
933 char path[_POSIX_PATH_MAX]; 1344 char path[__PAX_UTILS_PATH_MAX];
934 int i = 0;
935 1345
936 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1346 if (i + 1 == ARRAY_SIZE(ldpaths))
937 return; 1347 return i;
938 1348
1349 if ((fp = fopen(fname, "r")) == NULL)
1350 return i;
1351
939 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1352 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
940 if (*path != '/')
941 continue;
942
943 if ((p = strrchr(path, '\r')) != NULL) 1353 if ((p = strrchr(path, '\r')) != NULL)
944 *p = 0; 1354 *p = 0;
945 if ((p = strchr(path, '\n')) != NULL) 1355 if ((p = strchr(path, '\n')) != NULL)
946 *p = 0; 1356 *p = 0;
1357#ifdef __linux__
1358 // recursive includes of the same file will make this segfault.
1359 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1360 glob64_t gl;
1361 size_t x;
1362 char gpath[__PAX_UTILS_PATH_MAX];
1363
1364 memset(gpath, 0, sizeof(gpath));
1365
1366 if (path[8] != '/')
1367 snprintf(gpath, sizeof(gpath), "/etc/%s", &path[8]);
1368 else
1369 strncpy(gpath, &path[8], sizeof(gpath));
1370
1371 if ((glob64(gpath, 0, NULL, &gl)) == 0) {
1372 for (x = 0; x < gl.gl_pathc; ++x) {
1373 /* try to avoid direct loops */
1374 if (strcmp(gl.gl_pathv[x], fname) == 0)
1375 continue;
1376 i = load_ld_cache_config(i, gl.gl_pathv[x]);
1377 if (i + 1 >= ARRAY_SIZE(ldpaths)) {
1378 globfree64(&gl);
1379 return i;
1380 }
1381 }
1382 globfree64 (&gl);
1383 continue;
1384 }
1385 }
1386#endif
1387 if (*path != '/')
1388 continue;
947 1389
948 ldpaths[i++] = xstrdup(path); 1390 ldpaths[i++] = xstrdup(path);
949 1391
950 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths)) 1392 if (i + 1 == ARRAY_SIZE(ldpaths))
951 break; 1393 break;
952 } 1394 }
953 ldpaths[i] = NULL; 1395 ldpaths[i] = NULL;
954 1396
955 fclose(fp); 1397 fclose(fp);
1398 return i;
956} 1399}
1400
1401#elif defined(__FreeBSD__) || (__DragonFly__)
1402
1403static int load_ld_cache_config(int i, const char *fname)
1404{
1405 FILE *fp = NULL;
1406 char *b = NULL, *p;
1407 struct elfhints_hdr hdr;
1408
1409 if (i + 1 == ARRAY_SIZE(ldpaths))
1410 return i;
1411
1412 if ((fp = fopen(fname, "r")) == NULL)
1413 return i;
1414
1415 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1416 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1417 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1418 {
1419 fclose(fp);
1420 return i;
1421 }
1422
1423 b = (char*)malloc(hdr.dirlistlen+1);
1424 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1425 fclose(fp);
1426 free(b);
1427 return i;
1428 }
1429
1430 while ((p = strsep(&b, ":"))) {
1431 if (*p == '\0') continue;
1432 ldpaths[i++] = xstrdup(p);
1433
1434 if (i + 1 == ARRAY_SIZE(ldpaths))
1435 break;
1436 }
1437 ldpaths[i] = NULL;
1438
1439 free(b);
1440 fclose(fp);
1441 return i;
1442}
1443
1444#else
1445
1446#warning Cache config support not implemented for your target
1447static int load_ld_cache_config(int i, const char *fname)
1448{
1449 memset(ldpaths, 0x00, sizeof(ldpaths));
1450}
1451
1452#endif
957 1453
958/* scan /etc/ld.so.conf for paths */ 1454/* scan /etc/ld.so.conf for paths */
959static void scanelf_ldpath() 1455static void scanelf_ldpath()
960{ 1456{
961 char scan_l, scan_ul, scan_ull; 1457 char scan_l, scan_ul, scan_ull;
995 } 1491 }
996 1492
997 free(path); 1493 free(path);
998} 1494}
999 1495
1000
1001
1002/* usage / invocation handling functions */ 1496/* usage / invocation handling functions */
1003#define PARSE_FLAGS "plRmyxetrnibSs:gN:TaqvF:f:o:BhV" 1497#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:BhV"
1004#define a_argument required_argument 1498#define a_argument required_argument
1005static struct option const long_opts[] = { 1499static struct option const long_opts[] = {
1006 {"path", no_argument, NULL, 'p'}, 1500 {"path", no_argument, NULL, 'p'},
1007 {"ldpath", no_argument, NULL, 'l'}, 1501 {"ldpath", no_argument, NULL, 'l'},
1008 {"recursive", no_argument, NULL, 'R'}, 1502 {"recursive", no_argument, NULL, 'R'},
1009 {"mount", no_argument, NULL, 'm'}, 1503 {"mount", no_argument, NULL, 'm'},
1010 {"symlink", no_argument, NULL, 'y'}, 1504 {"symlink", no_argument, NULL, 'y'},
1505 {"archives", no_argument, NULL, 'A'},
1506 {"ldcache", no_argument, NULL, 'L'},
1507 {"fix", no_argument, NULL, 'X'},
1508 {"setpax", a_argument, NULL, 'z'},
1011 {"pax", no_argument, NULL, 'x'}, 1509 {"pax", no_argument, NULL, 'x'},
1012 {"header", no_argument, NULL, 'e'}, 1510 {"header", no_argument, NULL, 'e'},
1013 {"textrel", no_argument, NULL, 't'}, 1511 {"textrel", no_argument, NULL, 't'},
1014 {"rpath", no_argument, NULL, 'r'}, 1512 {"rpath", no_argument, NULL, 'r'},
1015 {"needed", no_argument, NULL, 'n'}, 1513 {"needed", no_argument, NULL, 'n'},
1016 {"interp", no_argument, NULL, 'i'}, 1514 {"interp", no_argument, NULL, 'i'},
1017 {"bind", no_argument, NULL, 'b'}, 1515 {"bind", no_argument, NULL, 'b'},
1018 {"soname", no_argument, NULL, 'S'}, 1516 {"soname", no_argument, NULL, 'S'},
1019 {"symbol", a_argument, NULL, 's'}, 1517 {"symbol", a_argument, NULL, 's'},
1518 {"section", a_argument, NULL, 'k'},
1020 {"lib", a_argument, NULL, 'N'}, 1519 {"lib", a_argument, NULL, 'N'},
1021 {"gmatch", no_argument, NULL, 'g'}, 1520 {"gmatch", no_argument, NULL, 'g'},
1022 {"textrels", no_argument, NULL, 'T'}, 1521 {"textrels", no_argument, NULL, 'T'},
1522 {"etype", a_argument, NULL, 'E'},
1523 {"bits", a_argument, NULL, 'M'},
1023 {"all", no_argument, NULL, 'a'}, 1524 {"all", no_argument, NULL, 'a'},
1024 {"quiet", no_argument, NULL, 'q'}, 1525 {"quiet", no_argument, NULL, 'q'},
1025 {"verbose", no_argument, NULL, 'v'}, 1526 {"verbose", no_argument, NULL, 'v'},
1026 {"format", a_argument, NULL, 'F'}, 1527 {"format", a_argument, NULL, 'F'},
1027 {"from", a_argument, NULL, 'f'}, 1528 {"from", a_argument, NULL, 'f'},
1035static const char *opts_help[] = { 1536static const char *opts_help[] = {
1036 "Scan all directories in PATH environment", 1537 "Scan all directories in PATH environment",
1037 "Scan all directories in /etc/ld.so.conf", 1538 "Scan all directories in /etc/ld.so.conf",
1038 "Scan directories recursively", 1539 "Scan directories recursively",
1039 "Don't recursively cross mount points", 1540 "Don't recursively cross mount points",
1040 "Don't scan symlinks\n", 1541 "Don't scan symlinks",
1542 "Scan archives (.a files)",
1543 "Utilize ld.so.cache information (use with -r/-n)",
1544 "Try and 'fix' bad things (use with -r/-e)",
1545 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1041 "Print PaX markings", 1546 "Print PaX markings",
1042 "Print GNU_STACK/PT_LOAD markings", 1547 "Print GNU_STACK/PT_LOAD markings",
1043 "Print TEXTREL information", 1548 "Print TEXTREL information",
1044 "Print RPATH information", 1549 "Print RPATH information",
1045 "Print NEEDED information", 1550 "Print NEEDED information",
1046 "Print INTERP information", 1551 "Print INTERP information",
1047 "Print BIND information", 1552 "Print BIND information",
1048 "Print SONAME information", 1553 "Print SONAME information",
1049 "Find a specified symbol", 1554 "Find a specified symbol",
1555 "Find a specified section",
1050 "Find a specified library", 1556 "Find a specified library",
1051 "Use strncmp to match libraries. (use with -N)", 1557 "Use strncmp to match libraries. (use with -N)",
1052 "Locate cause of TEXTREL", 1558 "Locate cause of TEXTREL",
1559 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1560 "Print only ELF files matching numeric bits",
1053 "Print all scanned info (-x -e -t -r -b)\n", 1561 "Print all scanned info (-x -e -t -r -b)\n",
1054 "Only output 'bad' things", 1562 "Only output 'bad' things",
1055 "Be verbose (can be specified more than once)", 1563 "Be verbose (can be specified more than once)",
1056 "Use specified format for output", 1564 "Use specified format for output",
1057 "Read input stream from a filename", 1565 "Read input stream from a filename",
1065/* display usage and exit */ 1573/* display usage and exit */
1066static void usage(int status) 1574static void usage(int status)
1067{ 1575{
1068 unsigned long i; 1576 unsigned long i;
1069 printf("* Scan ELF binaries for stuff\n\n" 1577 printf("* Scan ELF binaries for stuff\n\n"
1070 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0); 1578 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1071 printf("Options: -[%s]\n", PARSE_FLAGS); 1579 printf("Options: -[%s]\n", PARSE_FLAGS);
1072 for (i = 0; long_opts[i].name; ++i) 1580 for (i = 0; long_opts[i].name; ++i)
1073 if (long_opts[i].has_arg == no_argument) 1581 if (long_opts[i].has_arg == no_argument)
1074 printf(" -%c, --%-13s* %s\n", long_opts[i].val, 1582 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
1075 long_opts[i].name, opts_help[i]); 1583 long_opts[i].name, opts_help[i]);
1076 else 1584 else
1077 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val, 1585 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
1078 long_opts[i].name, opts_help[i]); 1586 long_opts[i].name, opts_help[i]);
1079 1587
1080 if (status != EXIT_SUCCESS) 1588 if (status != EXIT_SUCCESS)
1081 exit(status); 1589 exit(status);
1082 1590
1083 puts("\nThe format modifiers for the -F option are:"); 1591 puts("\nThe format modifiers for the -F option are:");
1084 puts(" F Filename \tx PaX Flags \te STACK/RELRO"); 1592 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1085 puts(" t TEXTREL \tr RPATH \tn NEEDED"); 1593 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1086 puts(" i INTERP \tb BIND \ts symbol"); 1594 puts(" i INTERP \tb BIND \ts symbol");
1087 puts(" N library \to Type \tT TEXTRELs"); 1595 puts(" N library \to Type \tT TEXTRELs");
1088 puts(" S SONAME"); 1596 puts(" S SONAME \tk section");
1089 puts(" p filename (with search path removed)"); 1597 puts(" p filename (with search path removed)");
1090 puts(" f filename (short name/basename)"); 1598 puts(" f filename (short name/basename)");
1091 puts("Prefix each modifier with '%' (verbose) or '#' (silent)"); 1599 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1092 1600
1601 puts("\nELF Etypes:");
1602 print_etypes(stdout);
1603
1093 exit(status); 1604 exit(status);
1094} 1605}
1095 1606
1096/* parse command line arguments and preform needed actions */ 1607/* parse command line arguments and preform needed actions */
1097static void parseargs(int argc, char *argv[]) 1608static int parseargs(int argc, char *argv[])
1098{ 1609{
1099 int i; 1610 int i;
1100 char *from_file = NULL; 1611 const char *from_file = NULL;
1612 int ret = 0;
1101 1613
1102 opterr = 0; 1614 opterr = 0;
1103 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 1615 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1104 switch (i) { 1616 switch (i) {
1105 1617
1109 VERSION, __FILE__, __DATE__, rcsid, argv0); 1621 VERSION, __FILE__, __DATE__, rcsid, argv0);
1110 exit(EXIT_SUCCESS); 1622 exit(EXIT_SUCCESS);
1111 break; 1623 break;
1112 case 'h': usage(EXIT_SUCCESS); break; 1624 case 'h': usage(EXIT_SUCCESS); break;
1113 case 'f': 1625 case 'f':
1114 if (from_file) err("Don't specify -f twice"); 1626 if (from_file) warn("You prob don't want to specify -f twice");
1115 from_file = xstrdup(optarg); 1627 from_file = optarg;
1628 break;
1629 case 'E':
1630 strncpy(match_etypes, optarg, sizeof(match_etypes));
1631 break;
1632 case 'M':
1633 match_bits = atoi(optarg);
1116 break; 1634 break;
1117 case 'o': { 1635 case 'o': {
1118 FILE *fp = NULL;
1119 if ((fp = freopen(optarg, "w", stdout)) == NULL) 1636 if (freopen(optarg, "w", stdout) == NULL)
1120 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 1637 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1121 SET_STDOUT(fp);
1122 break; 1638 break;
1123 } 1639 }
1124 1640 case 'k':
1641 if (find_section) warn("You prob don't want to specify -k twice");
1642 find_section = optarg;
1643 break;
1125 case 's': { 1644 case 's': {
1126 size_t len;
1127 if (find_sym) err("Don't specify -s twice"); 1645 if (find_sym) warn("You prob don't want to specify -s twice");
1128 find_sym = xstrdup(optarg); 1646 find_sym = optarg;
1129 len = strlen(find_sym) + 1;
1130 versioned_symname = (char*)xmalloc(sizeof(char) * (len+1)); 1647 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1131 sprintf(versioned_symname, "%s@", find_sym); 1648 sprintf(versioned_symname, "%s@", find_sym);
1132 break; 1649 break;
1133 } 1650 }
1134 case 'N': { 1651 case 'N': {
1135 if (find_lib) err("Don't specify -N twice"); 1652 if (find_lib) warn("You prob don't want to specify -N twice");
1136 find_lib = xstrdup(optarg); 1653 find_lib = optarg;
1137 break; 1654 break;
1138 } 1655 }
1139 1656
1140 case 'F': { 1657 case 'F': {
1141 if (out_format) err("Don't specify -F twice"); 1658 if (out_format) warn("You prob don't want to specify -F twice");
1142 out_format = xstrdup(optarg); 1659 out_format = optarg;
1660 break;
1661 }
1662 case 'z': {
1663 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1664 size_t x;
1665
1666 for (x = 0 ; x < strlen(optarg); x++) {
1667 switch(optarg[x]) {
1668 case 'p':
1669 case 'P':
1670 do_state(optarg[x], PAGEEXEC);
1143 break; 1671 break;
1672 case 's':
1673 case 'S':
1674 do_state(optarg[x], SEGMEXEC);
1675 break;
1676 case 'm':
1677 case 'M':
1678 do_state(optarg[x], MPROTECT);
1679 break;
1680 case 'e':
1681 case 'E':
1682 do_state(optarg[x], EMUTRAMP);
1683 break;
1684 case 'r':
1685 case 'R':
1686 do_state(optarg[x], RANDMMAP);
1687 break;
1688 case 'x':
1689 case 'X':
1690 do_state(optarg[x], RANDEXEC);
1691 break;
1692 default:
1693 break;
1694 }
1144 } 1695 }
1145 1696 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
1697 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
1698 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
1699 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
1700 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1701 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1702 setpax = flags;
1703 break;
1704 }
1146 case 'g': gmatch = 1; 1705 case 'g': gmatch = 1; break;
1706 case 'L': use_ldcache = 1; break;
1147 case 'y': scan_symlink = 0; break; 1707 case 'y': scan_symlink = 0; break;
1708 case 'A': scan_archives = 1; break;
1148 case 'B': show_banner = 0; break; 1709 case 'B': show_banner = 0; break;
1149 case 'l': scan_ldpath = 1; break; 1710 case 'l': scan_ldpath = 1; break;
1150 case 'p': scan_envpath = 1; break; 1711 case 'p': scan_envpath = 1; break;
1151 case 'R': dir_recurse = 1; break; 1712 case 'R': dir_recurse = 1; break;
1152 case 'm': dir_crossmount = 0; break; 1713 case 'm': dir_crossmount = 0; break;
1714 case 'X': ++fix_elf; break;
1153 case 'x': show_pax = 1; break; 1715 case 'x': show_pax = 1; break;
1154 case 'e': show_phdr = 1; break; 1716 case 'e': show_phdr = 1; break;
1155 case 't': show_textrel = 1; break; 1717 case 't': show_textrel = 1; break;
1156 case 'r': show_rpath = 1; break; 1718 case 'r': show_rpath = 1; break;
1157 case 'n': show_needed = 1; break; 1719 case 'n': show_needed = 1; break;
1162 case 'q': be_quiet = 1; break; 1724 case 'q': be_quiet = 1; break;
1163 case 'v': be_verbose = (be_verbose % 20) + 1; break; 1725 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1164 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break; 1726 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
1165 1727
1166 case ':': 1728 case ':':
1167 err("Option missing parameter\n"); 1729 err("Option '%c' is missing parameter", optopt);
1168 case '?': 1730 case '?':
1169 err("Unknown option\n"); 1731 err("Unknown option '%c' or argument missing", optopt);
1170 default: 1732 default:
1171 err("Unhandled option '%c'", i); 1733 err("Unhandled option '%c'; please report this", i);
1172 } 1734 }
1173 } 1735 }
1174 1736
1175 /* let the format option override all other options */ 1737 /* let the format option override all other options */
1176 if (out_format) { 1738 if (out_format) {
1179 show_textrels = 0; 1741 show_textrels = 0;
1180 for (i = 0; out_format[i]; ++i) { 1742 for (i = 0; out_format[i]; ++i) {
1181 if (!IS_MODIFIER(out_format[i])) continue; 1743 if (!IS_MODIFIER(out_format[i])) continue;
1182 1744
1183 switch (out_format[++i]) { 1745 switch (out_format[++i]) {
1746 case '+': break;
1184 case '%': break; 1747 case '%': break;
1185 case '#': break; 1748 case '#': break;
1186 case 'F': break; 1749 case 'F': break;
1187 case 'p': break; 1750 case 'p': break;
1188 case 'f': break; 1751 case 'f': break;
1752 case 'k': break;
1189 case 's': break; 1753 case 's': break;
1190 case 'N': break; 1754 case 'N': break;
1191 case 'o': break; 1755 case 'o': break;
1192 case 'x': show_pax = 1; break; 1756 case 'x': show_pax = 1; break;
1193 case 'e': show_phdr = 1; break; 1757 case 'e': show_phdr = 1; break;
1197 case 'i': show_interp = 1; break; 1761 case 'i': show_interp = 1; break;
1198 case 'b': show_bind = 1; break; 1762 case 'b': show_bind = 1; break;
1199 case 'S': show_soname = 1; break; 1763 case 'S': show_soname = 1; break;
1200 case 'T': show_textrels = 1; break; 1764 case 'T': show_textrels = 1; break;
1201 default: 1765 default:
1202 err("Invalid format specifier '%c' (byte %i)", 1766 err("Invalid format specifier '%c' (byte %i)",
1203 out_format[i], i+1); 1767 out_format[i], i+1);
1204 } 1768 }
1205 } 1769 }
1206 1770
1207 /* construct our default format */ 1771 /* construct our default format */
1217 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 1781 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1218 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len); 1782 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1219 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len); 1783 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1220 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len); 1784 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1221 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len); 1785 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1786 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1222 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len); 1787 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1223 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 1788 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1224 } 1789 }
1225 if (be_verbose > 2) printf("Format: %s\n", out_format); 1790 if (be_verbose > 2) printf("Format: %s\n", out_format);
1226 1791
1227 /* now lets actually do the scanning */ 1792 /* now lets actually do the scanning */
1228 if (scan_ldpath || (show_rpath && be_quiet)) 1793 if (scan_ldpath || use_ldcache)
1229 load_ld_so_conf(); 1794 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
1230 if (scan_ldpath) scanelf_ldpath(); 1795 if (scan_ldpath) scanelf_ldpath();
1231 if (scan_envpath) scanelf_envpath(); 1796 if (scan_envpath) scanelf_envpath();
1797 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
1798 from_file = "-";
1232 if (from_file) { 1799 if (from_file) {
1233 scanelf_from_file(from_file); 1800 scanelf_from_file(from_file);
1234 free(from_file);
1235 from_file = *argv; 1801 from_file = *argv;
1236 } 1802 }
1237 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file) 1803 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1238 err("Nothing to scan !?"); 1804 err("Nothing to scan !?");
1239 while (optind < argc) { 1805 while (optind < argc) {
1240 search_path = argv[optind++]; 1806 search_path = argv[optind++];
1241 scanelf_dir(search_path); 1807 ret = scanelf_dir(search_path);
1242 } 1808 }
1243 1809
1244 /* clean up */ 1810 /* clean up */
1245 if (find_sym) {
1246 free(find_sym);
1247 free(versioned_symname); 1811 free(versioned_symname);
1248 }
1249 if (find_lib) free(find_lib);
1250 if (out_format) free(out_format);
1251 for (i = 0; ldpaths[i]; ++i) 1812 for (i = 0; ldpaths[i]; ++i)
1252 free(ldpaths[i]); 1813 free(ldpaths[i]);
1814
1815 if (ldcache != 0)
1816 munmap(ldcache, ldcache_size);
1817 return ret;
1818}
1819
1820static char **get_split_env(const char *envvar)
1821{
1822 const char *delims = " \t\n";
1823 char **envvals = NULL;
1824 char *env, *s;
1825 int nentry;
1826
1827 if ((env = getenv(envvar)) == NULL)
1828 return NULL;
1829
1830 env = xstrdup(env);
1831 if (env == NULL)
1832 return NULL;
1833
1834 s = strtok(env, delims);
1835 if (s == NULL) {
1836 free(env);
1837 return NULL;
1838 }
1839
1840 nentry = 0;
1841 while (s != NULL) {
1842 ++nentry;
1843 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
1844 envvals[nentry-1] = s;
1845 s = strtok(NULL, delims);
1846 }
1847 envvals[nentry] = NULL;
1848
1849 /* don't want to free(env) as it contains the memory that backs
1850 * the envvals array of strings */
1851 return envvals;
1852}
1853static void parseenv()
1854{
1855 qa_textrels = get_split_env("QA_TEXTRELS");
1856 qa_execstack = get_split_env("QA_EXECSTACK");
1857 qa_wx_load = get_split_env("QA_WX_LOAD");
1858}
1859
1860#ifdef __PAX_UTILS_CLEANUP
1861static void cleanup()
1862{
1863 free(out_format);
1864 free(qa_textrels);
1865 free(qa_execstack);
1866 free(qa_wx_load);
1867}
1868#endif
1869
1870
1871int main(int argc, char *argv[])
1872{
1873 int ret;
1874 if (argc < 2)
1875 usage(EXIT_FAILURE);
1876 parseenv();
1877 ret = parseargs(argc, argv);
1878 fclose(stdout);
1879#ifdef __PAX_UTILS_CLEANUP
1880 cleanup();
1881 warn("The calls to add/delete heap should be off:\n"
1882 "\t- 1 due to the out_buffer not being freed in scanelf_file()\n"
1883 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
1884#endif
1885 return ret;
1253} 1886}
1254 1887
1255 1888
1256 1889
1257/* utility funcs */ 1890/* utility funcs */
1259{ 1892{
1260 char *ret = strdup(s); 1893 char *ret = strdup(s);
1261 if (!ret) err("Could not strdup(): %s", strerror(errno)); 1894 if (!ret) err("Could not strdup(): %s", strerror(errno));
1262 return ret; 1895 return ret;
1263} 1896}
1264
1265static void *xmalloc(size_t size) 1897static void *xmalloc(size_t size)
1266{ 1898{
1267 void *ret = malloc(size); 1899 void *ret = malloc(size);
1268 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size); 1900 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1269 return ret; 1901 return ret;
1270} 1902}
1271 1903static void *xrealloc(void *ptr, size_t size)
1904{
1905 void *ret = realloc(ptr, size);
1906 if (!ret) err("Could not realloc() %li bytes", (unsigned long)size);
1907 return ret;
1908}
1272static void xstrcat(char **dst, const char *src, size_t *curr_len) 1909static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
1273{ 1910{
1274 size_t new_len; 1911 size_t new_len;
1275 1912
1276 new_len = strlen(*dst) + strlen(src); 1913 new_len = strlen(*dst) + strlen(src);
1277 if (*curr_len <= new_len) { 1914 if (*curr_len <= new_len) {
1278 *curr_len = new_len + (*curr_len / 2); 1915 *curr_len = new_len + (*curr_len / 2);
1279 *dst = realloc(*dst, *curr_len); 1916 *dst = realloc(*dst, *curr_len);
1280 if (!*dst) 1917 if (!*dst)
1281 err("could not realloc %li bytes", (unsigned long)*curr_len); 1918 err("could not realloc() %li bytes", (unsigned long)*curr_len);
1282 } 1919 }
1283 1920
1921 if (n)
1922 strncat(*dst, src, n);
1923 else
1284 strcat(*dst, src); 1924 strcat(*dst, src);
1285} 1925}
1286
1287static inline void xchrcat(char **dst, const char append, size_t *curr_len) 1926static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1288{ 1927{
1289 static char my_app[2]; 1928 static char my_app[2];
1290 my_app[0] = append; 1929 my_app[0] = append;
1291 my_app[1] = '\0'; 1930 my_app[1] = '\0';
1292 xstrcat(dst, my_app, curr_len); 1931 xstrcat(dst, my_app, curr_len);
1293} 1932}
1294 1933
1295 1934/* Match filename against entries in matchlist, return TRUE
1296 1935 * if the file is listed */
1297int main(int argc, char *argv[]) 1936static int file_matches_list(const char *filename, char **matchlist)
1298{ 1937{
1299 if (argc < 2) 1938 char **file;
1300 usage(EXIT_FAILURE); 1939 char *match;
1301 parseargs(argc, argv); 1940 char buf[__PAX_UTILS_PATH_MAX];
1302 fclose(stdout); 1941
1303#ifdef __BOUNDS_CHECKING_ON 1942 if (matchlist == NULL)
1304 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()"); 1943 return 0;
1305#endif 1944
1306 return EXIT_SUCCESS; 1945 for (file = matchlist; *file != NULL; file++) {
1946 if (search_path) {
1947 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
1948 match = buf;
1949 } else {
1950 match = *file;
1951 }
1952 if (fnmatch(match, filename, 0) == 0)
1953 return 1;
1954 }
1955 return 0;
1307} 1956}

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