/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.97 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 1.97 2005/12/29 14:03:25 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 <sys/mman.h>
20#include <fcntl.h>
21#include <dirent.h>
22#include <getopt.h>
23#include <assert.h>
24#include "paxinc.h" 10#include "paxinc.h"
25 11
26static const char *rcsid = "$Id: scanelf.c,v 1.97 2005/12/29 14:03:25 vapier Exp $"; 12static const char *rcsid = "$Id: scanelf.c,v 1.164 2006/12/03 00:17:18 solar Exp $";
27#define argv0 "scanelf" 13#define argv0 "scanelf"
28 14
29#define IS_MODIFIER(c) (c == '%' || c == '#') 15#define IS_MODIFIER(c) (c == '%' || c == '#' || c == '+')
30 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 }
31 25
32 26
33/* prototypes */ 27/* prototypes */
34static 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);
35static void scanelf_dir(const char *path); 33static int scanelf_dir(const char *path);
36static void scanelf_ldpath(); 34static void scanelf_ldpath(void);
37static void scanelf_envpath(); 35static void scanelf_envpath(void);
38static void usage(int status); 36static void usage(int status);
37static char **get_split_env(const char *envvar);
38static void parseenv(void);
39static void parseargs(int argc, char *argv[]); 39static int parseargs(int argc, char *argv[]);
40static char *xstrdup(const char *s); 40static char *xstrdup(const char *s);
41static void *xmalloc(size_t size); 41static void *xmalloc(size_t size);
42static void *xrealloc(void *ptr, size_t size);
42static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n); 43static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n);
43#define xstrcat(dst,src,curr_len) xstrncat(dst,src,curr_len,0) 44#define xstrcat(dst,src,curr_len) xstrncat(dst,src,curr_len,0)
44static 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);
45 46
46/* variables to control behavior */ 47/* variables to control behavior */
48static char match_etypes[126] = "";
47static char *ldpaths[256]; 49static char *ldpaths[256];
48static char scan_ldpath = 0; 50static char scan_ldpath = 0;
49static char scan_envpath = 0; 51static char scan_envpath = 0;
50static char scan_symlink = 1; 52static char scan_symlink = 1;
53static char scan_archives = 0;
51static char dir_recurse = 0; 54static char dir_recurse = 0;
52static char dir_crossmount = 1; 55static char dir_crossmount = 1;
53static char show_pax = 0; 56static char show_pax = 0;
54static char show_phdr = 0; 57static char show_phdr = 0;
55static char show_textrel = 0; 58static char show_textrel = 0;
61static char show_textrels = 0; 64static char show_textrels = 0;
62static char show_banner = 1; 65static char show_banner = 1;
63static char be_quiet = 0; 66static char be_quiet = 0;
64static char be_verbose = 0; 67static char be_verbose = 0;
65static char be_wewy_wewy_quiet = 0; 68static char be_wewy_wewy_quiet = 0;
69static char be_semi_verbose = 0;
66static char *find_sym = NULL, *versioned_symname = NULL; 70static char *find_sym = NULL, *versioned_symname = NULL;
67static char *find_lib = NULL; 71static char *find_lib = NULL;
72static char *find_section = NULL;
68static char *out_format = NULL; 73static char *out_format = NULL;
69static char *search_path = NULL; 74static char *search_path = NULL;
75static char fix_elf = 0;
70static char gmatch = 0; 76static char gmatch = 0;
71static char printcache = 0; 77static char use_ldcache = 0;
72 78
79static char **qa_textrels = NULL;
80static char **qa_execstack = NULL;
81static char **qa_wx_load = NULL;
73 82
83int match_bits = 0;
74caddr_t ldcache = 0; 84caddr_t ldcache = 0;
75size_t ldcache_size = 0; 85size_t ldcache_size = 0;
86unsigned long setpax = 0UL;
87
88
76 89
77/* sub-funcs for scanelf_file() */ 90/* sub-funcs for scanelf_file() */
78static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab) 91static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
79{ 92{
80 /* find the best SHT_DYNSYM and SHT_STRTAB sections */ 93 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
99 } \ 112 } \
100 } 113 }
101 GET_SYMTABS(32) 114 GET_SYMTABS(32)
102 GET_SYMTABS(64) 115 GET_SYMTABS(64)
103} 116}
117
104static char *scanelf_file_pax(elfobj *elf, char *found_pax) 118static char *scanelf_file_pax(elfobj *elf, char *found_pax)
105{ 119{
106 static char ret[7]; 120 static char ret[7];
107 unsigned long i, shown; 121 unsigned long i, shown;
108 122
117 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 131 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
118 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 132 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
119 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 133 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
120 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \ 134 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
121 continue; \ 135 continue; \
122 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))) \
123 continue; \ 141 continue; \
124 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); \
125 *found_pax = 1; \ 143 *found_pax = 1; \
126 ++shown; \ 144 ++shown; \
127 break; \ 145 break; \
128 } \ 146 } \
129 } 147 }
130 SHOW_PAX(32) 148 SHOW_PAX(32)
131 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 }
132 } 162 }
133 163
134 /* fall back to EI_PAX if no PT_PAX was found */ 164 /* fall back to EI_PAX if no PT_PAX was found */
135 if (!*ret) { 165 if (!*ret) {
136 static char *paxflags; 166 static char *paxflags;
150 180
151static 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)
152{ 182{
153 static char ret[12]; 183 static char ret[12];
154 char *found; 184 char *found;
155 unsigned long i, shown;
156 unsigned char multi_stack, multi_relro, multi_load; 185 unsigned long i, shown, multi_stack, multi_relro, multi_load;
186 int max_pt_load;
157 187
158 if (!show_phdr) return NULL; 188 if (!show_phdr) return NULL;
159 189
160 memcpy(ret, "--- --- ---\0", 12); 190 memcpy(ret, "--- --- ---\0", 12);
161 191
162 shown = 0; 192 shown = 0;
163 multi_stack = multi_relro = multi_load = 0; 193 multi_stack = multi_relro = multi_load = 0;
194 max_pt_load = elf_max_pt_load(elf);
164 195
196#define NOTE_GNU_STACK ".note.GNU-stack"
165#define SHOW_PHDR(B) \ 197#define SHOW_PHDR(B) \
166 if (elf->elf_class == ELFCLASS ## B) { \ 198 if (elf->elf_class == ELFCLASS ## B) { \
167 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 199 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
168 Elf ## B ## _Off offset; \ 200 Elf ## B ## _Off offset; \
169 uint32_t flags, check_flags; \ 201 uint32_t flags, check_flags; \
170 if (elf->phdr != NULL) { \ 202 if (elf->phdr != NULL) { \
171 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 203 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
172 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \ 204 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
173 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \ 205 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
206 if (multi_stack++) \
174 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; \
175 found = found_phdr; \ 210 found = found_phdr; \
176 offset = 0; \ 211 offset = 0; \
177 check_flags = PF_X; \ 212 check_flags = PF_X; \
178 } 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++) \
179 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \ 215 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
180 found = found_relro; \ 216 found = found_relro; \
181 offset = 4; \ 217 offset = 4; \
182 check_flags = PF_X; \ 218 check_flags = PF_X; \
183 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \ 219 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
184 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; \
185 found = found_load; \ 225 found = found_load; \
186 offset = 8; \ 226 offset = 8; \
187 check_flags = PF_W|PF_X; \ 227 check_flags = PF_W|PF_X; \
188 } else \ 228 } else \
189 continue; \ 229 continue; \
190 flags = EGET(phdr[i].p_flags); \ 230 flags = EGET(phdr[i].p_flags); \
191 if (be_quiet && ((flags & check_flags) != check_flags)) \ 231 if (be_quiet && ((flags & check_flags) != check_flags)) \
192 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 } \
193 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \ 238 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
194 *found = 1; \ 239 *found = 1; \
195 ++shown; \ 240 ++shown; \
196 } \ 241 } \
197 } else if (elf->shdr != NULL) { \ 242 } else if (elf->shdr != NULL) { \
198 /* no program headers which means this is prob an object file */ \ 243 /* no program headers which means this is prob an object file */ \
199 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \ 244 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
200 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; \
201 check_flags = SHF_WRITE|SHF_EXECINSTR; \ 249 check_flags = SHF_WRITE|SHF_EXECINSTR; \
202 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \ 250 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
203 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \ 251 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
204 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \ 252 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
205 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)) { \
206 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); \
207 flags = EGET(shdr[i].sh_flags); \ 257 flags = EGET(shdr[i].sh_flags); \
208 if (be_quiet && ((flags & check_flags) != check_flags)) \ 258 if (be_quiet && ((flags & check_flags) != check_flags)) \
209 continue; \ 259 continue; \
210 ++*found_phdr; \ 260 ++*found_phdr; \
214 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \ 264 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
215 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \ 265 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
216 break; \ 266 break; \
217 } \ 267 } \
218 } \ 268 } \
269 skip_this_shdr##B: \
219 if (!multi_stack) { \ 270 if (!multi_stack) { \
271 if (file_matches_list(elf->filename, qa_execstack)) \
272 return NULL; \
220 *found_phdr = 1; \ 273 *found_phdr = 1; \
221 shown = 1; \ 274 shown = 1; \
222 memcpy(ret, "!WX", 3); \ 275 memcpy(ret, "!WX", 3); \
223 } \ 276 } \
224 } \ 277 } \
229 if (be_wewy_wewy_quiet || (be_quiet && !shown)) 282 if (be_wewy_wewy_quiet || (be_quiet && !shown))
230 return NULL; 283 return NULL;
231 else 284 else
232 return ret; 285 return ret;
233} 286}
287
234static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 288static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
235{ 289{
236 static const char *ret = "TEXTREL"; 290 static const char *ret = "TEXTREL";
237 unsigned long i; 291 unsigned long i;
238 292
239 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;
240 296
241 if (elf->phdr) { 297 if (elf->phdr) {
242#define SHOW_TEXTREL(B) \ 298#define SHOW_TEXTREL(B) \
243 if (elf->elf_class == ELFCLASS ## B) { \ 299 if (elf->elf_class == ELFCLASS ## B) { \
244 Elf ## B ## _Dyn *dyn; \ 300 Elf ## B ## _Dyn *dyn; \
327 if (be_verbose <= 2) continue; \ 383 if (be_verbose <= 2) continue; \
328 } else \ 384 } else \
329 *found_textrels = 1; \ 385 *found_textrels = 1; \
330 /* locate this relocation symbol name */ \ 386 /* locate this relocation symbol name */ \
331 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 } \
332 sym_max = ELF ## B ## _R_SYM(r_info); \ 392 sym_max = ELF ## B ## _R_SYM(r_info); \
333 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \ 393 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
334 sym += sym_max; \ 394 sym += sym_max; \
335 else \ 395 else \
336 sym = NULL; \ 396 sym = NULL; \
368 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);
369 429
370 return NULL; 430 return NULL;
371} 431}
372 432
373static void rpath_security_checks(elfobj *, char *); 433static void rpath_security_checks(elfobj *, char *, const char *);
374static void rpath_security_checks(elfobj *elf, char *item) { 434static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
435{
375 struct stat st; 436 struct stat st;
376 switch (*item) { 437 switch (*item) {
377 case '/': break; 438 case '/': break;
378 case '.': 439 case '.':
379 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);
380 break; 441 break;
442 case ':':
381 case '\0': 443 case '\0':
382 warnf("Security problem NULL RPATH in %s", elf->filename); 444 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
383 break; 445 break;
384 case '$': 446 case '$':
385 if (fstat(elf->fd, &st) != -1) 447 if (fstat(elf->fd, &st) != -1)
386 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID)) 448 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
387 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",
388 item, elf->filename, st.st_mode & 07777); 450 dt_type, item, elf->filename, st.st_mode & 07777);
389 break; 451 break;
390 default: 452 default:
391 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);
392 break; 454 break;
393 } 455 }
394} 456}
395static 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)
396{ 458{
432 /* Verify the memory is somewhat sane */ \ 494 /* Verify the memory is somewhat sane */ \
433 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 495 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
434 if (offset < (Elf ## B ## _Off)elf->len) { \ 496 if (offset < (Elf ## B ## _Off)elf->len) { \
435 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \ 497 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
436 *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); \
437 /* If quiet, don't output paths in ld.so.conf */ \ 502 /* If quiet, don't output paths in ld.so.conf */ \
438 if (be_quiet) { \ 503 if (be_quiet) { \
439 size_t len; \ 504 size_t len; \
440 char *start, *end; \ 505 char *start, *end; \
441 /* note that we only 'chop' off leading known paths. */ \ 506 /* note that we only 'chop' off leading known paths. */ \
442 /* 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. */ \
443 start = *r; \ 508 start = *r; \
444 /* scan each path in : delimited list */ \ 509 /* scan each path in : delimited list */ \
445 while (start) { \ 510 while (start) { \
446 rpath_security_checks(elf, start); \ 511 rpath_security_checks(elf, start, get_elfdtype(word)); \
447 end = strchr(start, ':'); \ 512 end = strchr(start, ':'); \
448 len = (end ? abs(end - start) : strlen(start)); \ 513 len = (end ? abs(end - start) : strlen(start)); \
514 if (use_ldcache) \
449 for (s = 0; ldpaths[s]; ++s) { \ 515 for (s = 0; ldpaths[s]; ++s) \
450 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \ 516 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
451 *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)++; \
452 break; \ 522 break; \
453 } \ 523 } \
454 } \
455 if (!*r || !ldpaths[s] || !end) \ 524 if (!*r || !end) \
456 start = NULL; \ 525 break; \
457 else \ 526 else \
458 start = start + len + 1; \ 527 start = start + len + 1; \
459 } \ 528 } \
460 } \ 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) \
461 if (*r) *found_rpath = 1; \ 570 *found_rpath = 1; \
571 } \
462 } \ 572 } \
463 ++dyn; \ 573 ++dyn; \
464 } \ 574 } \
465 } } 575 } }
466 SHOW_RPATH(32) 576 SHOW_RPATH(32)
504#define FLAG_POWERPC_LIB64 0x0500 614#define FLAG_POWERPC_LIB64 0x0500
505#define FLAG_MIPS64_LIBN32 0x0600 615#define FLAG_MIPS64_LIBN32 0x0600
506#define FLAG_MIPS64_LIBN64 0x0700 616#define FLAG_MIPS64_LIBN64 0x0700
507 617
508static char *lookup_cache_lib(elfobj *, char *); 618static char *lookup_cache_lib(elfobj *, char *);
619
620#if defined(__GLIBC__) || defined(__UCLIBC__)
621
509static char *lookup_cache_lib(elfobj *elf, char *fname) 622static char *lookup_cache_lib(elfobj *elf, char *fname)
510{ 623{
511 int fd = 0; 624 int fd = 0;
512 char *strs; 625 char *strs;
513 static char buf[_POSIX_PATH_MAX] = ""; 626 static char buf[__PAX_UTILS_PATH_MAX] = "";
514 const char *cachefile = "/etc/ld.so.cache"; 627 const char *cachefile = "/etc/ld.so.cache";
515 struct stat st; 628 struct stat st;
516 629
517 typedef struct { 630 typedef struct {
518 char magic[LDSO_CACHE_MAGIC_LEN]; 631 char magic[LDSO_CACHE_MAGIC_LEN];
539 ldcache_size = st.st_size; 652 ldcache_size = st.st_size;
540 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0); 653 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
541 654
542 close(fd); 655 close(fd);
543 656
544 if (ldcache == (caddr_t)-1) 657 if (ldcache == (caddr_t)-1) {
658 ldcache = 0;
545 return NULL; 659 return NULL;
660 }
546 661
547 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN)) 662 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
548 return NULL; 663 return NULL;
549 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN)) 664 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
550 return NULL; 665 return NULL;
567 continue; 682 continue;
568 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf)); 683 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
569 } 684 }
570 return buf; 685 return buf;
571} 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;
572 692
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
573 719
574static 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)
575{ 721{
576 unsigned long i; 722 unsigned long i;
577 char *needed; 723 char *needed;
604 } \ 750 } \
605 needed = (char*)(elf->data + offset); \ 751 needed = (char*)(elf->data + offset); \
606 if (op == 0) { \ 752 if (op == 0) { \
607 if (!be_wewy_wewy_quiet) { \ 753 if (!be_wewy_wewy_quiet) { \
608 if (*found_needed) xchrcat(ret, ',', ret_len); \ 754 if (*found_needed) xchrcat(ret, ',', ret_len); \
609 if (printcache) \ 755 if (use_ldcache) \
610 if ((p = lookup_cache_lib(elf, needed)) != NULL) \ 756 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
611 needed = p; \ 757 needed = p; \
612 xstrcat(ret, needed, ret_len); \ 758 xstrcat(ret, needed, ret_len); \
613 } \ 759 } \
614 *found_needed = 1; \ 760 *found_needed = 1; \
652} 798}
653static char *scanelf_file_bind(elfobj *elf, char *found_bind) 799static char *scanelf_file_bind(elfobj *elf, char *found_bind)
654{ 800{
655 unsigned long i; 801 unsigned long i;
656 struct stat s; 802 struct stat s;
803 char dynamic = 0;
657 804
658 if (!show_bind) return NULL; 805 if (!show_bind) return NULL;
659 if (!elf->phdr) return NULL; 806 if (!elf->phdr) return NULL;
660 807
661#define SHOW_BIND(B) \ 808#define SHOW_BIND(B) \
664 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 811 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
665 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 812 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
666 Elf ## B ## _Off offset; \ 813 Elf ## B ## _Off offset; \
667 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 814 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
668 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 815 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
816 dynamic = 1; \
669 offset = EGET(phdr[i].p_offset); \ 817 offset = EGET(phdr[i].p_offset); \
670 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 818 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
671 dyn = DYN ## B (elf->data + offset); \ 819 dyn = DYN ## B (elf->data + offset); \
672 while (EGET(dyn->d_tag) != DT_NULL) { \ 820 while (EGET(dyn->d_tag) != DT_NULL) { \
673 if (EGET(dyn->d_tag) == DT_BIND_NOW || \ 821 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
684 SHOW_BIND(32) 832 SHOW_BIND(32)
685 SHOW_BIND(64) 833 SHOW_BIND(64)
686 834
687 if (be_wewy_wewy_quiet) return NULL; 835 if (be_wewy_wewy_quiet) return NULL;
688 836
837 /* don't output anything if quiet mode and the ELF is static or not setuid */
689 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))))) {
690 return NULL; 839 return NULL;
691 } else { 840 } else {
692 *found_bind = 1; 841 *found_bind = 1;
693 return (char *) "LAZY"; 842 return (char *) (dynamic ? "LAZY" : "STATIC");
694 } 843 }
695} 844}
696static char *scanelf_file_soname(elfobj *elf, char *found_soname) 845static char *scanelf_file_soname(elfobj *elf, char *found_soname)
697{ 846{
698 unsigned long i; 847 unsigned long i;
754#define FIND_SYM(B) \ 903#define FIND_SYM(B) \
755 if (elf->elf_class == ELFCLASS ## B) { \ 904 if (elf->elf_class == ELFCLASS ## B) { \
756 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 905 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
757 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 906 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
758 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)); \
759 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 908 unsigned long cnt = EGET(symtab->sh_entsize); \
760 char *symname; \ 909 char *symname; \
910 if (cnt) \
911 cnt = EGET(symtab->sh_size) / cnt; \
761 for (i = 0; i < cnt; ++i) { \ 912 for (i = 0; i < cnt; ++i) { \
762 if (sym->st_name) { \ 913 if (sym->st_name) { \
914 /* make sure the symbol name is in acceptable memory range */ \
763 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 */ \
764 if (*find_sym == '*') { \ 922 if (*ret == '*') { \
765 printf("%s(%s) %5lX %15s %s\n", \ 923 printf("%s(%s) %5lX %15s %s\n", \
766 ((*found_sym == 0) ? "\n\t" : "\t"), \ 924 ((*found_sym == 0) ? "\n\t" : "\t"), \
767 elf->base_filename, \ 925 elf->base_filename, \
768 (unsigned long)sym->st_size, \ 926 (unsigned long)sym->st_size, \
769 get_elfstttype(sym->st_info), \ 927 get_elfstttype(sym->st_info), \
770 symname); \ 928 symname); \
771 *found_sym = 1; \ 929 *found_sym = 1; \
772 } else { \ 930 } else { \
931 /* allow the user to specify a comma delimited list of symbols to search for */ \
773 char *this_sym, *next_sym; \ 932 char *this_sym, *this_sym_ver, *next_sym; \
933 this_sym = ret; \
774 this_sym = find_sym; \ 934 this_sym_ver = versioned_symname; \
775 do { \ 935 do { \
776 next_sym = strchr(this_sym, ','); \ 936 next_sym = strchr(this_sym, ','); \
777 if (next_sym == NULL) \ 937 if (next_sym == NULL) \
778 next_sym = this_sym + strlen(this_sym); \ 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 */ \
779 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \ 953 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
780 (strcmp(symname, versioned_symname) == 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 \
781 ret = this_sym; \ 961 ret = this_sym; \
782 (*found_sym)++; \ 962 (*found_sym)++; \
783 goto break_out; \ 963 goto break_out; \
784 } \ 964 } \
785 this_sym = next_sym + 1; \ 965 skip_this_sym##B: this_sym = next_sym + 1; \
786 } while (*next_sym != '\0'); \ 966 } while (*next_sym != '\0'); \
787 } \ 967 } \
788 } \ 968 } \
789 ++sym; \ 969 ++sym; \
790 } } 970 } }
800 if (be_quiet) 980 if (be_quiet)
801 return NULL; 981 return NULL;
802 else 982 else
803 return (char *)" - "; 983 return (char *)" - ";
804} 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
805/* scan an elf file and show all the fun stuff */ 1016/* scan an elf file and show all the fun stuff */
806#define prints(str) write(fileno(stdout), str, strlen(str)) 1017#define prints(str) write(fileno(stdout), str, strlen(str))
807static void scanelf_file(const char *filename) 1018static int scanelf_elfobj(elfobj *elf)
808{ 1019{
809 unsigned long i; 1020 unsigned long i;
810 char found_pax, found_phdr, found_relro, found_load, found_textrel, 1021 char found_pax, found_phdr, found_relro, found_load, found_textrel,
811 found_rpath, found_needed, found_interp, found_bind, found_soname, 1022 found_rpath, found_needed, found_interp, found_bind, found_soname,
812 found_sym, found_lib, found_file, found_textrels; 1023 found_sym, found_lib, found_file, found_textrels, found_section;
813 elfobj *elf;
814 struct stat st;
815 static char *out_buffer = NULL; 1024 static char *out_buffer = NULL;
816 static size_t out_len; 1025 static size_t out_len;
817 1026
818 /* make sure 'filename' exists */
819 if (lstat(filename, &st) == -1) {
820 if (be_verbose > 2) printf("%s: does not exist\n", filename);
821 return;
822 }
823 /* always handle regular files and handle symlinked files if no -y */
824 if (S_ISLNK(st.st_mode)) {
825 if (!scan_symlink) return;
826 stat(filename, &st);
827 }
828 if (!S_ISREG(st.st_mode)) {
829 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
830 return;
831 }
832
833 found_pax = found_phdr = found_relro = found_load = found_textrel = \ 1027 found_pax = found_phdr = found_relro = found_load = found_textrel = \
834 found_rpath = found_needed = found_interp = found_bind = found_soname = \ 1028 found_rpath = found_needed = found_interp = found_bind = found_soname = \
835 found_sym = found_lib = found_file = found_textrels = 0; 1029 found_sym = found_lib = found_file = found_textrels = found_section = 0;
836 1030
837 /* verify this is real ELF */
838 if ((elf = readelf(filename)) == NULL) {
839 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
840 return;
841 }
842
843 if (be_verbose > 1) 1031 if (be_verbose > 2)
844 printf("%s: scanning file {%s,%s}\n", filename, 1032 printf("%s: scanning file {%s,%s}\n", elf->filename,
845 get_elfeitype(EI_CLASS, elf->elf_class), 1033 get_elfeitype(EI_CLASS, elf->elf_class),
846 get_elfeitype(EI_DATA, elf->data[EI_DATA])); 1034 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
847 else if (be_verbose) 1035 else if (be_verbose > 1)
848 printf("%s: scanning file\n", filename); 1036 printf("%s: scanning file\n", elf->filename);
849 1037
850 /* init output buffer */ 1038 /* init output buffer */
851 if (!out_buffer) { 1039 if (!out_buffer) {
852 out_len = sizeof(char) * 80; 1040 out_len = sizeof(char) * 80;
853 out_buffer = (char*)xmalloc(out_len); 1041 out_buffer = (char*)xmalloc(out_len);
858 if (!be_quiet && show_banner) { 1046 if (!be_quiet && show_banner) {
859 for (i = 0; out_format[i]; ++i) { 1047 for (i = 0; out_format[i]; ++i) {
860 if (!IS_MODIFIER(out_format[i])) continue; 1048 if (!IS_MODIFIER(out_format[i])) continue;
861 1049
862 switch (out_format[++i]) { 1050 switch (out_format[++i]) {
1051 case '+': break;
863 case '%': break; 1052 case '%': break;
864 case '#': break; 1053 case '#': break;
865 case 'F': 1054 case 'F':
866 case 'p': 1055 case 'p':
867 case 'f': prints("FILE "); found_file = 1; break; 1056 case 'f': prints("FILE "); found_file = 1; break;
875 case 'b': prints("BIND "); break; 1064 case 'b': prints("BIND "); break;
876 case 'S': prints("SONAME "); break; 1065 case 'S': prints("SONAME "); break;
877 case 's': prints("SYM "); break; 1066 case 's': prints("SYM "); break;
878 case 'N': prints("LIB "); break; 1067 case 'N': prints("LIB "); break;
879 case 'T': prints("TEXTRELS "); break; 1068 case 'T': prints("TEXTRELS "); break;
1069 case 'k': prints("SECTION "); break;
880 default: warnf("'%c' has no title ?", out_format[i]); 1070 default: warnf("'%c' has no title ?", out_format[i]);
881 } 1071 }
882 } 1072 }
883 if (!found_file) prints("FILE "); 1073 if (!found_file) prints("FILE ");
884 prints("\n"); 1074 prints("\n");
889 /* dump all the good stuff */ 1079 /* dump all the good stuff */
890 for (i = 0; out_format[i]; ++i) { 1080 for (i = 0; out_format[i]; ++i) {
891 const char *out; 1081 const char *out;
892 const char *tmp; 1082 const char *tmp;
893 1083
894 /* make sure we trim leading spaces in quiet mode */
895 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
896 *out_buffer = '\0';
897
898 if (!IS_MODIFIER(out_format[i])) { 1084 if (!IS_MODIFIER(out_format[i])) {
899 xchrcat(&out_buffer, out_format[i], &out_len); 1085 xchrcat(&out_buffer, out_format[i], &out_len);
900 continue; 1086 continue;
901 } 1087 }
902 1088
903 out = NULL; 1089 out = NULL;
904 be_wewy_wewy_quiet = (out_format[i] == '#'); 1090 be_wewy_wewy_quiet = (out_format[i] == '#');
1091 be_semi_verbose = (out_format[i] == '+');
905 switch (out_format[++i]) { 1092 switch (out_format[++i]) {
1093 case '+':
906 case '%': 1094 case '%':
907 case '#': 1095 case '#':
908 xchrcat(&out_buffer, out_format[i], &out_len); break; 1096 xchrcat(&out_buffer, out_format[i], &out_len); break;
909 case 'F': 1097 case 'F':
910 found_file = 1; 1098 found_file = 1;
911 if (be_wewy_wewy_quiet) break; 1099 if (be_wewy_wewy_quiet) break;
912 xstrcat(&out_buffer, filename, &out_len); 1100 xstrcat(&out_buffer, elf->filename, &out_len);
913 break; 1101 break;
914 case 'p': 1102 case 'p':
915 found_file = 1; 1103 found_file = 1;
916 if (be_wewy_wewy_quiet) break; 1104 if (be_wewy_wewy_quiet) break;
917 tmp = filename; 1105 tmp = elf->filename;
918 if (search_path) { 1106 if (search_path) {
919 ssize_t len_search = strlen(search_path); 1107 ssize_t len_search = strlen(search_path);
920 ssize_t len_file = strlen(filename); 1108 ssize_t len_file = strlen(elf->filename);
921 if (!strncmp(filename, search_path, len_search) && \ 1109 if (!strncmp(elf->filename, search_path, len_search) && \
922 len_file > len_search) 1110 len_file > len_search)
923 tmp += len_search; 1111 tmp += len_search;
924 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++; 1112 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
925 } 1113 }
926 xstrcat(&out_buffer, tmp, &out_len); 1114 xstrcat(&out_buffer, tmp, &out_len);
927 break; 1115 break;
928 case 'f': 1116 case 'f':
929 found_file = 1; 1117 found_file = 1;
930 if (be_wewy_wewy_quiet) break; 1118 if (be_wewy_wewy_quiet) break;
931 tmp = strrchr(filename, '/'); 1119 tmp = strrchr(elf->filename, '/');
932 tmp = (tmp == NULL ? filename : tmp+1); 1120 tmp = (tmp == NULL ? elf->filename : tmp+1);
933 xstrcat(&out_buffer, tmp, &out_len); 1121 xstrcat(&out_buffer, tmp, &out_len);
934 break; 1122 break;
935 case 'o': out = get_elfetype(elf); break; 1123 case 'o': out = get_elfetype(elf); break;
936 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1124 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
937 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;
942 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;
943 case 'i': out = scanelf_file_interp(elf, &found_interp); break; 1131 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
944 case 'b': out = scanelf_file_bind(elf, &found_bind); break; 1132 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
945 case 'S': out = scanelf_file_soname(elf, &found_soname); break; 1133 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
946 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;
947 default: warnf("'%c' has no scan code?", out_format[i]); 1136 default: warnf("'%c' has no scan code?", out_format[i]);
948 } 1137 }
949 if (out) { 1138 if (out) {
950 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */ 1139 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
951 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL) 1140 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
956 } 1145 }
957 1146
958#define FOUND_SOMETHING() \ 1147#define FOUND_SOMETHING() \
959 (found_pax || found_phdr || found_relro || found_load || found_textrel || \ 1148 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
960 found_rpath || found_needed || found_interp || found_bind || \ 1149 found_rpath || found_needed || found_interp || found_bind || \
961 found_soname || found_sym || found_lib || found_textrels) 1150 found_soname || found_sym || found_lib || found_textrels || found_section )
962 1151
963 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) { 1152 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
964 xchrcat(&out_buffer, ' ', &out_len); 1153 xchrcat(&out_buffer, ' ', &out_len);
965 xstrcat(&out_buffer, filename, &out_len); 1154 xstrcat(&out_buffer, elf->filename, &out_len);
966 } 1155 }
967 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) { 1156 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
968 puts(out_buffer); 1157 puts(out_buffer);
969 fflush(stdout); 1158 fflush(stdout);
970 } 1159 }
971 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:
972 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;
973} 1261}
974 1262
975/* 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 */
976static void scanelf_dir(const char *path) 1264static int scanelf_dir(const char *path)
977{ 1265{
978 register DIR *dir; 1266 register DIR *dir;
979 register struct dirent *dentry; 1267 register struct dirent *dentry;
980 struct stat st_top, st; 1268 struct stat st_top, st;
981 char buf[_POSIX_PATH_MAX]; 1269 char buf[__PAX_UTILS_PATH_MAX];
982 size_t pathlen = 0, len = 0; 1270 size_t pathlen = 0, len = 0;
1271 int ret = 0;
983 1272
984 /* make sure path exists */ 1273 /* make sure path exists */
985 if (lstat(path, &st_top) == -1) { 1274 if (lstat(path, &st_top) == -1) {
986 if (be_verbose > 2) printf("%s: does not exist\n", path); 1275 if (be_verbose > 2) printf("%s: does not exist\n", path);
987 return; 1276 return 1;
988 } 1277 }
989 1278
990 /* 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 */
991 if (!S_ISDIR(st_top.st_mode)) { 1280 if (!S_ISDIR(st_top.st_mode)) {
992 scanelf_file(path); 1281 return scanelf_file(path, &st_top);
993 return;
994 } 1282 }
995 1283
996 /* now scan the dir looking for fun stuff */ 1284 /* now scan the dir looking for fun stuff */
997 if ((dir = opendir(path)) == NULL) { 1285 if ((dir = opendir(path)) == NULL) {
998 warnf("could not opendir %s: %s", path, strerror(errno)); 1286 warnf("could not opendir %s: %s", path, strerror(errno));
999 return; 1287 return 1;
1000 } 1288 }
1001 if (be_verbose) printf("%s: scanning dir\n", path); 1289 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1002 1290
1003 pathlen = strlen(path); 1291 pathlen = strlen(path);
1004 while ((dentry = readdir(dir))) { 1292 while ((dentry = readdir(dir))) {
1005 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1293 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1006 continue; 1294 continue;
1008 if (len >= sizeof(buf)) { 1296 if (len >= sizeof(buf)) {
1009 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path, 1297 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1010 (unsigned long)len, (unsigned long)sizeof(buf)); 1298 (unsigned long)len, (unsigned long)sizeof(buf));
1011 continue; 1299 continue;
1012 } 1300 }
1013 sprintf(buf, "%s/%s", path, dentry->d_name); 1301 snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name);
1014 if (lstat(buf, &st) != -1) { 1302 if (lstat(buf, &st) != -1) {
1015 if (S_ISREG(st.st_mode)) 1303 if (S_ISREG(st.st_mode))
1016 scanelf_file(buf); 1304 ret = scanelf_file(buf, &st);
1017 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1305 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1018 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1306 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1019 scanelf_dir(buf); 1307 ret = scanelf_dir(buf);
1020 } 1308 }
1021 } 1309 }
1022 } 1310 }
1023 closedir(dir); 1311 closedir(dir);
1312 return ret;
1024} 1313}
1025 1314
1026static int scanelf_from_file(char *filename) 1315static int scanelf_from_file(const char *filename)
1027{ 1316{
1028 FILE *fp = NULL; 1317 FILE *fp = NULL;
1029 char *p; 1318 char *p;
1030 char path[_POSIX_PATH_MAX]; 1319 char path[__PAX_UTILS_PATH_MAX];
1320 int ret = 0;
1031 1321
1032 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL)) 1322 if (strcmp(filename, "-") == 0)
1033 fp = stdin; 1323 fp = stdin;
1034 else if ((fp = fopen(filename, "r")) == NULL) 1324 else if ((fp = fopen(filename, "r")) == NULL)
1035 return 1; 1325 return 1;
1036 1326
1037 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1327 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1038 if ((p = strchr(path, '\n')) != NULL) 1328 if ((p = strchr(path, '\n')) != NULL)
1039 *p = 0; 1329 *p = 0;
1040 search_path = path; 1330 search_path = path;
1041 scanelf_dir(path); 1331 ret = scanelf_dir(path);
1042 } 1332 }
1043 if (fp != stdin) 1333 if (fp != stdin)
1044 fclose(fp); 1334 fclose(fp);
1045 return 0; 1335 return ret;
1046} 1336}
1047 1337
1048static 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)
1049{ 1341{
1050 FILE *fp = NULL; 1342 FILE *fp = NULL;
1051 char *p; 1343 char *p;
1052 char path[_POSIX_PATH_MAX]; 1344 char path[__PAX_UTILS_PATH_MAX];
1053 int i = 0;
1054 1345
1055 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1346 if (i + 1 == ARRAY_SIZE(ldpaths))
1056 return; 1347 return i;
1057 1348
1349 if ((fp = fopen(fname, "r")) == NULL)
1350 return i;
1351
1058 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1352 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1059 if (*path != '/')
1060 continue;
1061
1062 if ((p = strrchr(path, '\r')) != NULL) 1353 if ((p = strrchr(path, '\r')) != NULL)
1063 *p = 0; 1354 *p = 0;
1064 if ((p = strchr(path, '\n')) != NULL) 1355 if ((p = strchr(path, '\n')) != NULL)
1065 *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;
1066 1389
1067 ldpaths[i++] = xstrdup(path); 1390 ldpaths[i++] = xstrdup(path);
1068 1391
1069 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths)) 1392 if (i + 1 == ARRAY_SIZE(ldpaths))
1070 break; 1393 break;
1071 } 1394 }
1072 ldpaths[i] = NULL; 1395 ldpaths[i] = NULL;
1073 1396
1074 fclose(fp); 1397 fclose(fp);
1398 return i;
1075} 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
1076 1453
1077/* scan /etc/ld.so.conf for paths */ 1454/* scan /etc/ld.so.conf for paths */
1078static void scanelf_ldpath() 1455static void scanelf_ldpath()
1079{ 1456{
1080 char scan_l, scan_ul, scan_ull; 1457 char scan_l, scan_ul, scan_ull;
1114 } 1491 }
1115 1492
1116 free(path); 1493 free(path);
1117} 1494}
1118 1495
1119
1120/* usage / invocation handling functions */ 1496/* usage / invocation handling functions */
1121#define PARSE_FLAGS "plRmyxetrnLibSs:gN:TaqvF:f:o:BhV" 1497#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:BhV"
1122#define a_argument required_argument 1498#define a_argument required_argument
1123static struct option const long_opts[] = { 1499static struct option const long_opts[] = {
1124 {"path", no_argument, NULL, 'p'}, 1500 {"path", no_argument, NULL, 'p'},
1125 {"ldpath", no_argument, NULL, 'l'}, 1501 {"ldpath", no_argument, NULL, 'l'},
1126 {"recursive", no_argument, NULL, 'R'}, 1502 {"recursive", no_argument, NULL, 'R'},
1127 {"mount", no_argument, NULL, 'm'}, 1503 {"mount", no_argument, NULL, 'm'},
1128 {"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'},
1129 {"pax", no_argument, NULL, 'x'}, 1509 {"pax", no_argument, NULL, 'x'},
1130 {"header", no_argument, NULL, 'e'}, 1510 {"header", no_argument, NULL, 'e'},
1131 {"textrel", no_argument, NULL, 't'}, 1511 {"textrel", no_argument, NULL, 't'},
1132 {"rpath", no_argument, NULL, 'r'}, 1512 {"rpath", no_argument, NULL, 'r'},
1133 {"needed", no_argument, NULL, 'n'}, 1513 {"needed", no_argument, NULL, 'n'},
1134 {"ldcache", no_argument, NULL, 'L'},
1135 {"interp", no_argument, NULL, 'i'}, 1514 {"interp", no_argument, NULL, 'i'},
1136 {"bind", no_argument, NULL, 'b'}, 1515 {"bind", no_argument, NULL, 'b'},
1137 {"soname", no_argument, NULL, 'S'}, 1516 {"soname", no_argument, NULL, 'S'},
1138 {"symbol", a_argument, NULL, 's'}, 1517 {"symbol", a_argument, NULL, 's'},
1518 {"section", a_argument, NULL, 'k'},
1139 {"lib", a_argument, NULL, 'N'}, 1519 {"lib", a_argument, NULL, 'N'},
1140 {"gmatch", no_argument, NULL, 'g'}, 1520 {"gmatch", no_argument, NULL, 'g'},
1141 {"textrels", no_argument, NULL, 'T'}, 1521 {"textrels", no_argument, NULL, 'T'},
1522 {"etype", a_argument, NULL, 'E'},
1523 {"bits", a_argument, NULL, 'M'},
1142 {"all", no_argument, NULL, 'a'}, 1524 {"all", no_argument, NULL, 'a'},
1143 {"quiet", no_argument, NULL, 'q'}, 1525 {"quiet", no_argument, NULL, 'q'},
1144 {"verbose", no_argument, NULL, 'v'}, 1526 {"verbose", no_argument, NULL, 'v'},
1145 {"format", a_argument, NULL, 'F'}, 1527 {"format", a_argument, NULL, 'F'},
1146 {"from", a_argument, NULL, 'f'}, 1528 {"from", a_argument, NULL, 'f'},
1154static const char *opts_help[] = { 1536static const char *opts_help[] = {
1155 "Scan all directories in PATH environment", 1537 "Scan all directories in PATH environment",
1156 "Scan all directories in /etc/ld.so.conf", 1538 "Scan all directories in /etc/ld.so.conf",
1157 "Scan directories recursively", 1539 "Scan directories recursively",
1158 "Don't recursively cross mount points", 1540 "Don't recursively cross mount points",
1159 "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",
1160 "Print PaX markings", 1546 "Print PaX markings",
1161 "Print GNU_STACK/PT_LOAD markings", 1547 "Print GNU_STACK/PT_LOAD markings",
1162 "Print TEXTREL information", 1548 "Print TEXTREL information",
1163 "Print RPATH information", 1549 "Print RPATH information",
1164 "Print NEEDED information", 1550 "Print NEEDED information",
1165 "Resolve NEEDED information (use with -n)",
1166 "Print INTERP information", 1551 "Print INTERP information",
1167 "Print BIND information", 1552 "Print BIND information",
1168 "Print SONAME information", 1553 "Print SONAME information",
1169 "Find a specified symbol", 1554 "Find a specified symbol",
1555 "Find a specified section",
1170 "Find a specified library", 1556 "Find a specified library",
1171 "Use strncmp to match libraries. (use with -N)", 1557 "Use strncmp to match libraries. (use with -N)",
1172 "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",
1173 "Print all scanned info (-x -e -t -r -b)\n", 1561 "Print all scanned info (-x -e -t -r -b)\n",
1174 "Only output 'bad' things", 1562 "Only output 'bad' things",
1175 "Be verbose (can be specified more than once)", 1563 "Be verbose (can be specified more than once)",
1176 "Use specified format for output", 1564 "Use specified format for output",
1177 "Read input stream from a filename", 1565 "Read input stream from a filename",
1185/* display usage and exit */ 1573/* display usage and exit */
1186static void usage(int status) 1574static void usage(int status)
1187{ 1575{
1188 unsigned long i; 1576 unsigned long i;
1189 printf("* Scan ELF binaries for stuff\n\n" 1577 printf("* Scan ELF binaries for stuff\n\n"
1190 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0); 1578 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1191 printf("Options: -[%s]\n", PARSE_FLAGS); 1579 printf("Options: -[%s]\n", PARSE_FLAGS);
1192 for (i = 0; long_opts[i].name; ++i) 1580 for (i = 0; long_opts[i].name; ++i)
1193 if (long_opts[i].has_arg == no_argument) 1581 if (long_opts[i].has_arg == no_argument)
1194 printf(" -%c, --%-13s* %s\n", long_opts[i].val, 1582 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
1195 long_opts[i].name, opts_help[i]); 1583 long_opts[i].name, opts_help[i]);
1196 else 1584 else
1197 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val, 1585 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
1198 long_opts[i].name, opts_help[i]); 1586 long_opts[i].name, opts_help[i]);
1199 1587
1200 if (status != EXIT_SUCCESS) 1588 if (status != EXIT_SUCCESS)
1201 exit(status); 1589 exit(status);
1202 1590
1203 puts("\nThe format modifiers for the -F option are:"); 1591 puts("\nThe format modifiers for the -F option are:");
1204 puts(" F Filename \tx PaX Flags \te STACK/RELRO"); 1592 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1205 puts(" t TEXTREL \tr RPATH \tn NEEDED"); 1593 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1206 puts(" i INTERP \tb BIND \ts symbol"); 1594 puts(" i INTERP \tb BIND \ts symbol");
1207 puts(" N library \to Type \tT TEXTRELs"); 1595 puts(" N library \to Type \tT TEXTRELs");
1208 puts(" S SONAME"); 1596 puts(" S SONAME \tk section");
1209 puts(" p filename (with search path removed)"); 1597 puts(" p filename (with search path removed)");
1210 puts(" f filename (short name/basename)"); 1598 puts(" f filename (short name/basename)");
1211 puts("Prefix each modifier with '%' (verbose) or '#' (silent)"); 1599 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1212 1600
1601 puts("\nELF Etypes:");
1602 print_etypes(stdout);
1603
1213 exit(status); 1604 exit(status);
1214} 1605}
1215 1606
1216/* parse command line arguments and preform needed actions */ 1607/* parse command line arguments and preform needed actions */
1217static void parseargs(int argc, char *argv[]) 1608static int parseargs(int argc, char *argv[])
1218{ 1609{
1219 int i; 1610 int i;
1220 char *from_file = NULL; 1611 const char *from_file = NULL;
1612 int ret = 0;
1221 1613
1222 opterr = 0; 1614 opterr = 0;
1223 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) {
1224 switch (i) { 1616 switch (i) {
1225 1617
1229 VERSION, __FILE__, __DATE__, rcsid, argv0); 1621 VERSION, __FILE__, __DATE__, rcsid, argv0);
1230 exit(EXIT_SUCCESS); 1622 exit(EXIT_SUCCESS);
1231 break; 1623 break;
1232 case 'h': usage(EXIT_SUCCESS); break; 1624 case 'h': usage(EXIT_SUCCESS); break;
1233 case 'f': 1625 case 'f':
1234 if (from_file) err("Don't specify -f twice"); 1626 if (from_file) warn("You prob don't want to specify -f twice");
1235 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);
1236 break; 1634 break;
1237 case 'o': { 1635 case 'o': {
1238 FILE *fp = NULL;
1239 if ((fp = freopen(optarg, "w", stdout)) == NULL) 1636 if (freopen(optarg, "w", stdout) == NULL)
1240 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 1637 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1241 SET_STDOUT(fp);
1242 break; 1638 break;
1243 } 1639 }
1244 1640 case 'k':
1641 if (find_section) warn("You prob don't want to specify -k twice");
1642 find_section = optarg;
1643 break;
1245 case 's': { 1644 case 's': {
1246 if (find_sym) warn("You prob don't want to specify -s twice"); 1645 if (find_sym) warn("You prob don't want to specify -s twice");
1247 find_sym = optarg; 1646 find_sym = optarg;
1248 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1)); 1647 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1249 sprintf(versioned_symname, "%s@", find_sym); 1648 sprintf(versioned_symname, "%s@", find_sym);
1258 case 'F': { 1657 case 'F': {
1259 if (out_format) warn("You prob don't want to specify -F twice"); 1658 if (out_format) warn("You prob don't want to specify -F twice");
1260 out_format = optarg; 1659 out_format = optarg;
1261 break; 1660 break;
1262 } 1661 }
1662 case 'z': {
1663 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1664 size_t x;
1263 1665
1264 case 'g': gmatch = 1; /* break; any reason we dont breal; here ? */ 1666 for (x = 0 ; x < strlen(optarg); x++) {
1667 switch(optarg[x]) {
1668 case 'p':
1669 case 'P':
1670 do_state(optarg[x], PAGEEXEC);
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 }
1695 }
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 }
1705 case 'g': gmatch = 1; break;
1265 case 'L': printcache = 1; break; 1706 case 'L': use_ldcache = 1; break;
1266 case 'y': scan_symlink = 0; break; 1707 case 'y': scan_symlink = 0; break;
1708 case 'A': scan_archives = 1; break;
1267 case 'B': show_banner = 0; break; 1709 case 'B': show_banner = 0; break;
1268 case 'l': scan_ldpath = 1; break; 1710 case 'l': scan_ldpath = 1; break;
1269 case 'p': scan_envpath = 1; break; 1711 case 'p': scan_envpath = 1; break;
1270 case 'R': dir_recurse = 1; break; 1712 case 'R': dir_recurse = 1; break;
1271 case 'm': dir_crossmount = 0; break; 1713 case 'm': dir_crossmount = 0; break;
1714 case 'X': ++fix_elf; break;
1272 case 'x': show_pax = 1; break; 1715 case 'x': show_pax = 1; break;
1273 case 'e': show_phdr = 1; break; 1716 case 'e': show_phdr = 1; break;
1274 case 't': show_textrel = 1; break; 1717 case 't': show_textrel = 1; break;
1275 case 'r': show_rpath = 1; break; 1718 case 'r': show_rpath = 1; break;
1276 case 'n': show_needed = 1; break; 1719 case 'n': show_needed = 1; break;
1281 case 'q': be_quiet = 1; break; 1724 case 'q': be_quiet = 1; break;
1282 case 'v': be_verbose = (be_verbose % 20) + 1; break; 1725 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1283 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;
1284 1727
1285 case ':': 1728 case ':':
1286 err("Option missing parameter\n"); 1729 err("Option '%c' is missing parameter", optopt);
1287 case '?': 1730 case '?':
1288 err("Unknown option\n"); 1731 err("Unknown option '%c' or argument missing", optopt);
1289 default: 1732 default:
1290 err("Unhandled option '%c'", i); 1733 err("Unhandled option '%c'; please report this", i);
1291 } 1734 }
1292 } 1735 }
1293 1736
1294 /* let the format option override all other options */ 1737 /* let the format option override all other options */
1295 if (out_format) { 1738 if (out_format) {
1298 show_textrels = 0; 1741 show_textrels = 0;
1299 for (i = 0; out_format[i]; ++i) { 1742 for (i = 0; out_format[i]; ++i) {
1300 if (!IS_MODIFIER(out_format[i])) continue; 1743 if (!IS_MODIFIER(out_format[i])) continue;
1301 1744
1302 switch (out_format[++i]) { 1745 switch (out_format[++i]) {
1746 case '+': break;
1303 case '%': break; 1747 case '%': break;
1304 case '#': break; 1748 case '#': break;
1305 case 'F': break; 1749 case 'F': break;
1306 case 'p': break; 1750 case 'p': break;
1307 case 'f': break; 1751 case 'f': break;
1752 case 'k': break;
1308 case 's': break; 1753 case 's': break;
1309 case 'N': break; 1754 case 'N': break;
1310 case 'o': break; 1755 case 'o': break;
1311 case 'x': show_pax = 1; break; 1756 case 'x': show_pax = 1; break;
1312 case 'e': show_phdr = 1; break; 1757 case 'e': show_phdr = 1; break;
1316 case 'i': show_interp = 1; break; 1761 case 'i': show_interp = 1; break;
1317 case 'b': show_bind = 1; break; 1762 case 'b': show_bind = 1; break;
1318 case 'S': show_soname = 1; break; 1763 case 'S': show_soname = 1; break;
1319 case 'T': show_textrels = 1; break; 1764 case 'T': show_textrels = 1; break;
1320 default: 1765 default:
1321 err("Invalid format specifier '%c' (byte %i)", 1766 err("Invalid format specifier '%c' (byte %i)",
1322 out_format[i], i+1); 1767 out_format[i], i+1);
1323 } 1768 }
1324 } 1769 }
1325 1770
1326 /* construct our default format */ 1771 /* construct our default format */
1336 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 1781 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1337 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len); 1782 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1338 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len); 1783 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1339 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len); 1784 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1340 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);
1341 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len); 1787 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1342 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 1788 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1343 } 1789 }
1344 if (be_verbose > 2) printf("Format: %s\n", out_format); 1790 if (be_verbose > 2) printf("Format: %s\n", out_format);
1345 1791
1346 /* now lets actually do the scanning */ 1792 /* now lets actually do the scanning */
1347 if (scan_ldpath || (show_rpath && be_quiet)) 1793 if (scan_ldpath || use_ldcache)
1348 load_ld_so_conf(); 1794 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
1349 if (scan_ldpath) scanelf_ldpath(); 1795 if (scan_ldpath) scanelf_ldpath();
1350 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 = "-";
1351 if (from_file) { 1799 if (from_file) {
1352 scanelf_from_file(from_file); 1800 scanelf_from_file(from_file);
1353 free(from_file);
1354 from_file = *argv; 1801 from_file = *argv;
1355 } 1802 }
1356 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file) 1803 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1357 err("Nothing to scan !?"); 1804 err("Nothing to scan !?");
1358 while (optind < argc) { 1805 while (optind < argc) {
1359 search_path = argv[optind++]; 1806 search_path = argv[optind++];
1360 scanelf_dir(search_path); 1807 ret = scanelf_dir(search_path);
1361 } 1808 }
1362 1809
1363 /* clean up */ 1810 /* clean up */
1364 if (versioned_symname) free(versioned_symname); 1811 free(versioned_symname);
1365 for (i = 0; ldpaths[i]; ++i) 1812 for (i = 0; ldpaths[i]; ++i)
1366 free(ldpaths[i]); 1813 free(ldpaths[i]);
1367 1814
1368 if (ldcache != 0) 1815 if (ldcache != 0)
1369 munmap(ldcache, ldcache_size); 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;
1370} 1886}
1371 1887
1372 1888
1373 1889
1374/* utility funcs */ 1890/* utility funcs */
1380} 1896}
1381static void *xmalloc(size_t size) 1897static void *xmalloc(size_t size)
1382{ 1898{
1383 void *ret = malloc(size); 1899 void *ret = malloc(size);
1384 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size); 1900 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1901 return ret;
1902}
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);
1385 return ret; 1907 return ret;
1386} 1908}
1387static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n) 1909static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
1388{ 1910{
1389 size_t new_len; 1911 size_t new_len;
1407 my_app[0] = append; 1929 my_app[0] = append;
1408 my_app[1] = '\0'; 1930 my_app[1] = '\0';
1409 xstrcat(dst, my_app, curr_len); 1931 xstrcat(dst, my_app, curr_len);
1410} 1932}
1411 1933
1412 1934/* Match filename against entries in matchlist, return TRUE
1413 1935 * if the file is listed */
1414int main(int argc, char *argv[]) 1936static int file_matches_list(const char *filename, char **matchlist)
1415{ 1937{
1416 if (argc < 2) 1938 char **file;
1417 usage(EXIT_FAILURE); 1939 char *match;
1418 parseargs(argc, argv); 1940 char buf[__PAX_UTILS_PATH_MAX];
1419 fclose(stdout); 1941
1420#ifdef __BOUNDS_CHECKING_ON 1942 if (matchlist == NULL)
1421 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;
1422#endif 1944
1423 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;
1424} 1956}

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