/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.88 Revision 1.171
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 1.88 2005/09/30 03:30:54 vapier Exp $ 4 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.171 2007/01/09 23:01:09 vapier Exp $
5 * 5 *
6 * Copyright 2003-2005 Ned Ludd - <solar@gentoo.org> 6 * Copyright 2003-2006 Ned Ludd - <solar@gentoo.org>
7 * Copyright 2004-2005 Mike Frysinger - <vapier@gentoo.org> 7 * Copyright 2004-2006 Mike Frysinger - <vapier@gentoo.org>
8 */ 8 */
9 9
10#include <stdio.h>
11#include <stdlib.h>
12#include <sys/types.h>
13#include <libgen.h>
14#include <limits.h>
15#define __USE_GNU
16#include <string.h>
17#include <errno.h>
18#include <unistd.h>
19#include <sys/stat.h>
20#include <dirent.h>
21#include <getopt.h>
22#include <assert.h>
23#include "paxelf.h" 10#include "paxinc.h"
24 11
25static const char *rcsid = "$Id: scanelf.c,v 1.88 2005/09/30 03:30:54 vapier Exp $"; 12static const char *rcsid = "$Id: scanelf.c,v 1.171 2007/01/09 23:01:09 vapier Exp $";
26#define argv0 "scanelf" 13#define argv0 "scanelf"
27 14
28#define IS_MODIFIER(c) (c == '%' || c == '#') 15#define IS_MODIFIER(c) (c == '%' || c == '#' || c == '+')
29
30
31 16
32/* prototypes */ 17/* prototypes */
33static void scanelf_file(const char *filename); 18static int file_matches_list(const char *filename, char **matchlist);
19static int scanelf_elfobj(elfobj *elf);
20static int scanelf_elf(const char *filename, int fd, size_t len);
21static int scanelf_archive(const char *filename, int fd, size_t len);
22static int scanelf_file(const char *filename, const struct stat *st_cache);
34static void scanelf_dir(const char *path); 23static int scanelf_dir(const char *path);
35static void scanelf_ldpath(); 24static void scanelf_ldpath(void);
36static void scanelf_envpath(); 25static void scanelf_envpath(void);
37static void usage(int status); 26static void usage(int status);
27static char **get_split_env(const char *envvar);
28static void parseenv(void);
38static void parseargs(int argc, char *argv[]); 29static int parseargs(int argc, char *argv[]);
39static char *xstrdup(const char *s); 30static char *xstrdup(const char *s);
40static void *xmalloc(size_t size); 31static void *xmalloc(size_t size);
32static void *xrealloc(void *ptr, size_t size);
41static void xstrcat(char **dst, const char *src, size_t *curr_len); 33static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n);
34#define xstrcat(dst,src,curr_len) xstrncat(dst,src,curr_len,0)
42static inline void xchrcat(char **dst, const char append, size_t *curr_len); 35static inline void xchrcat(char **dst, const char append, size_t *curr_len);
43 36
44/* variables to control behavior */ 37/* variables to control behavior */
38static char match_etypes[126] = "";
45static char *ldpaths[256]; 39static char *ldpaths[256];
46static char scan_ldpath = 0; 40static char scan_ldpath = 0;
47static char scan_envpath = 0; 41static char scan_envpath = 0;
48static char scan_symlink = 1; 42static char scan_symlink = 1;
43static char scan_archives = 0;
49static char dir_recurse = 0; 44static char dir_recurse = 0;
50static char dir_crossmount = 1; 45static char dir_crossmount = 1;
51static char show_pax = 0; 46static char show_pax = 0;
52static char show_phdr = 0; 47static char show_phdr = 0;
53static char show_textrel = 0; 48static char show_textrel = 0;
59static char show_textrels = 0; 54static char show_textrels = 0;
60static char show_banner = 1; 55static char show_banner = 1;
61static char be_quiet = 0; 56static char be_quiet = 0;
62static char be_verbose = 0; 57static char be_verbose = 0;
63static char be_wewy_wewy_quiet = 0; 58static char be_wewy_wewy_quiet = 0;
59static char be_semi_verbose = 0;
64static char *find_sym = NULL, *versioned_symname = NULL; 60static char *find_sym = NULL, *versioned_symname = NULL;
65static char *find_lib = NULL; 61static char *find_lib = NULL;
62static char *find_section = NULL;
66static char *out_format = NULL; 63static char *out_format = NULL;
67static char *search_path = NULL; 64static char *search_path = NULL;
65static char fix_elf = 0;
68static char gmatch = 0; 66static char gmatch = 0;
67static char use_ldcache = 0;
69 68
69static char **qa_textrels = NULL;
70static char **qa_execstack = NULL;
71static char **qa_wx_load = NULL;
72
73int match_bits = 0;
74caddr_t ldcache = 0;
75size_t ldcache_size = 0;
76unsigned long setpax = 0UL;
77
78int has_objdump = 0;
79
80static char *which(const char *fname)
81{
82 static char fullpath[BUFSIZ];
83 char *path, *p;
84
85 memset(fullpath, 0x0, sizeof(fullpath));
86
87 path = getenv("PATH");
88
89 if (!path)
90 return NULL;
91
92 path = xstrdup(path);
93 while ((p = strrchr(path, ':')) != NULL) {
94 snprintf(fullpath, sizeof(fullpath), "%s/%s", p + 1, fname);
95 *p = 0;
96 if (access(fullpath, R_OK) != (-1)) {
97 free(path);
98 return (char *) fullpath;
99 }
100 }
101 free(path);
102 return NULL;
103}
70 104
71/* sub-funcs for scanelf_file() */ 105/* sub-funcs for scanelf_file() */
72static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab) 106static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
73{ 107{
74 /* find the best SHT_DYNSYM and SHT_STRTAB sections */ 108 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
93 } \ 127 } \
94 } 128 }
95 GET_SYMTABS(32) 129 GET_SYMTABS(32)
96 GET_SYMTABS(64) 130 GET_SYMTABS(64)
97} 131}
132
98static char *scanelf_file_pax(elfobj *elf, char *found_pax) 133static char *scanelf_file_pax(elfobj *elf, char *found_pax)
99{ 134{
100 static char *paxflags;
101 static char ret[7]; 135 static char ret[7];
102 unsigned long i, shown; 136 unsigned long i, shown;
103 137
104 if (!show_pax) return NULL; 138 if (!show_pax) return NULL;
105 139
112 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 146 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
113 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 147 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
114 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 148 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
115 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \ 149 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
116 continue; \ 150 continue; \
117 if (be_quiet && (EGET(phdr[i].p_flags) == 10240)) \ 151 if (fix_elf && setpax) { \
152 /* set the paxctl flags */ \
153 ESET(phdr[i].p_flags, setpax); \
154 } \
155 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
118 continue; \ 156 continue; \
119 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \ 157 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
120 *found_pax = 1; \ 158 *found_pax = 1; \
121 ++shown; \ 159 ++shown; \
122 break; \ 160 break; \
124 } 162 }
125 SHOW_PAX(32) 163 SHOW_PAX(32)
126 SHOW_PAX(64) 164 SHOW_PAX(64)
127 } 165 }
128 166
167
168 if (fix_elf && setpax) {
169 /* set the chpax settings */
170 if (elf->elf_class == ELFCLASS32) {
171 if (EHDR32(elf->ehdr)->e_type == ET_DYN || EHDR32(elf->ehdr)->e_type == ET_EXEC)
172 ESET(EHDR32(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
173 } else {
174 if (EHDR64(elf->ehdr)->e_type == ET_DYN || EHDR64(elf->ehdr)->e_type == ET_EXEC)
175 ESET(EHDR64(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
176 }
177 }
178
129 /* fall back to EI_PAX if no PT_PAX was found */ 179 /* fall back to EI_PAX if no PT_PAX was found */
130 if (!*ret) { 180 if (!*ret) {
181 static char *paxflags;
131 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf)); 182 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
132 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) { 183 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
133 *found_pax = 1; 184 *found_pax = 1;
134 return paxflags; 185 return (be_wewy_wewy_quiet ? NULL : paxflags);
135 } 186 }
136 strncpy(ret, paxflags, sizeof(ret)); 187 strncpy(ret, paxflags, sizeof(ret));
137 } 188 }
138 189
139 if (be_quiet && !shown) 190 if (be_wewy_wewy_quiet || (be_quiet && !shown))
140 return NULL; 191 return NULL;
192 else
141 return ret; 193 return ret;
142
143} 194}
195
144static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load) 196static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
145{ 197{
146 static char ret[12]; 198 static char ret[12];
147 char *found; 199 char *found;
148 unsigned long i, off, shown, check_flags;
149 unsigned char multi_stack, multi_relro, multi_load; 200 unsigned long i, shown, multi_stack, multi_relro, multi_load;
201 int max_pt_load;
150 202
151 if (!show_phdr) return NULL; 203 if (!show_phdr) return NULL;
152 204
153 memcpy(ret, "--- --- ---\0", 12); 205 memcpy(ret, "--- --- ---\0", 12);
154 206
155 shown = 0; 207 shown = 0;
156 multi_stack = multi_relro = multi_load = 0; 208 multi_stack = multi_relro = multi_load = 0;
209 max_pt_load = elf_max_pt_load(elf);
157 210
158 if (elf->phdr) { 211#define NOTE_GNU_STACK ".note.GNU-stack"
159#define SHOW_PHDR(B) \ 212#define SHOW_PHDR(B) \
160 if (elf->elf_class == ELFCLASS ## B) { \ 213 if (elf->elf_class == ELFCLASS ## B) { \
161 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 214 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
215 Elf ## B ## _Off offset; \
216 uint32_t flags, check_flags; \
217 if (elf->phdr != NULL) { \
162 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 218 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
163 uint32_t flags; \
164 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 219 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
165 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \ 220 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
221 if (multi_stack++) \
166 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \ 222 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
223 if (file_matches_list(elf->filename, qa_execstack)) \
224 continue; \
167 found = found_phdr; \ 225 found = found_phdr; \
168 off = 0; \ 226 offset = 0; \
169 check_flags = PF_X; \ 227 check_flags = PF_X; \
170 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \ 228 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
229 if (multi_relro++) \
171 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \ 230 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
172 found = found_relro; \ 231 found = found_relro; \
173 off = 4; \ 232 offset = 4; \
174 check_flags = PF_X; \ 233 check_flags = PF_X; \
175 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \ 234 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
176 if (multi_load++ > 2) warnf("%s: more than 2 PT_LOAD's !?", elf->filename); \ 235 if (ehdr->e_type == ET_DYN || ehdr->e_type == ET_EXEC) \
236 if (multi_load++ > max_pt_load) \
237 warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
238 if (file_matches_list(elf->filename, qa_wx_load)) \
239 continue; \
177 found = found_load; \ 240 found = found_load; \
178 off = 8; \ 241 offset = 8; \
179 check_flags = PF_W|PF_X; \ 242 check_flags = PF_W|PF_X; \
180 } else \ 243 } else \
181 continue; \ 244 continue; \
182 flags = EGET(phdr[i].p_flags); \ 245 flags = EGET(phdr[i].p_flags); \
183 if (be_quiet && ((flags & check_flags) != check_flags)) \ 246 if (be_quiet && ((flags & check_flags) != check_flags)) \
184 continue; \ 247 continue; \
248 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
249 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
250 ret[3] = ret[7] = '!'; \
251 flags = EGET(phdr[i].p_flags); \
252 } \
185 memcpy(ret+off, gnu_short_stack_flags(flags), 3); \ 253 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
186 *found = 1; \ 254 *found = 1; \
187 ++shown; \ 255 ++shown; \
256 } \
257 } else if (elf->shdr != NULL) { \
258 /* no program headers which means this is prob an object file */ \
259 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
260 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
261 char *str; \
262 if ((void*)strtbl > (void*)elf->data_end) \
263 goto skip_this_shdr##B; \
264 check_flags = SHF_WRITE|SHF_EXECINSTR; \
265 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
266 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
267 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
268 str = elf->data + offset; \
269 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
270 if (!strcmp(str, NOTE_GNU_STACK)) { \
271 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
272 flags = EGET(shdr[i].sh_flags); \
273 if (be_quiet && ((flags & check_flags) != check_flags)) \
274 continue; \
275 ++*found_phdr; \
276 shown = 1; \
277 if (flags & SHF_WRITE) ret[0] = 'W'; \
278 if (flags & SHF_ALLOC) ret[1] = 'A'; \
279 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
280 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
281 break; \
282 } \
283 } \
284 skip_this_shdr##B: \
285 if (!multi_stack) { \
286 if (file_matches_list(elf->filename, qa_execstack)) \
287 return NULL; \
288 *found_phdr = 1; \
289 shown = 1; \
290 memcpy(ret, "!WX", 3); \
291 } \
188 } \ 292 } \
189 } 293 }
190 SHOW_PHDR(32) 294 SHOW_PHDR(32)
191 SHOW_PHDR(64) 295 SHOW_PHDR(64)
192 }
193 296
194 if (be_quiet && !shown) 297 if (be_wewy_wewy_quiet || (be_quiet && !shown))
195 return NULL; 298 return NULL;
196 else 299 else
197 return ret; 300 return ret;
198} 301}
302
199static char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 303static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
200{ 304{
201 static char ret[] = "TEXTREL"; 305 static const char *ret = "TEXTREL";
202 unsigned long i; 306 unsigned long i;
203 307
204 if (!show_textrel && !show_textrels) return NULL; 308 if (!show_textrel && !show_textrels) return NULL;
309
310 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
205 311
206 if (elf->phdr) { 312 if (elf->phdr) {
207#define SHOW_TEXTREL(B) \ 313#define SHOW_TEXTREL(B) \
208 if (elf->elf_class == ELFCLASS ## B) { \ 314 if (elf->elf_class == ELFCLASS ## B) { \
209 Elf ## B ## _Dyn *dyn; \ 315 Elf ## B ## _Dyn *dyn; \
229 } 335 }
230 336
231 if (be_quiet || be_wewy_wewy_quiet) 337 if (be_quiet || be_wewy_wewy_quiet)
232 return NULL; 338 return NULL;
233 else 339 else
234 return (char *)" - "; 340 return " - ";
235} 341}
236static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel) 342static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
237{ 343{
238 unsigned long s, r, rmax; 344 unsigned long s, r, rmax;
239 void *symtab_void, *strtab_void, *text_void; 345 void *symtab_void, *strtab_void, *text_void;
292 if (be_verbose <= 2) continue; \ 398 if (be_verbose <= 2) continue; \
293 } else \ 399 } else \
294 *found_textrels = 1; \ 400 *found_textrels = 1; \
295 /* locate this relocation symbol name */ \ 401 /* locate this relocation symbol name */ \
296 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 402 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
403 if ((void*)sym > (void*)elf->data_end) { \
404 warn("%s: corrupt ELF symbol", elf->filename); \
405 continue; \
406 } \
297 sym_max = ELF ## B ## _R_SYM(r_info); \ 407 sym_max = ELF ## B ## _R_SYM(r_info); \
298 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \ 408 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
299 sym += sym_max; \ 409 sym += sym_max; \
300 else \ 410 else \
301 sym = NULL; \ 411 sym = NULL; \
303 /* show the raw details about this reloc */ \ 413 /* show the raw details about this reloc */ \
304 printf(" %s: ", elf->base_filename); \ 414 printf(" %s: ", elf->base_filename); \
305 if (sym && sym->st_name) \ 415 if (sym && sym->st_name) \
306 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \ 416 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \
307 else \ 417 else \
308 printf("(memory/fake?)"); \ 418 printf("(memory/data?)"); \
309 printf(" [0x%lX]", (unsigned long)r_offset); \ 419 printf(" [0x%lX]", (unsigned long)r_offset); \
310 /* now try to find the closest symbol that this rel is probably in */ \ 420 /* now try to find the closest symbol that this rel is probably in */ \
311 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 421 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
312 func = NULL; \ 422 func = NULL; \
313 offset_tmp = 0; \ 423 offset_tmp = 0; \
317 offset_tmp = EGET(sym->st_value); \ 427 offset_tmp = EGET(sym->st_value); \
318 } \ 428 } \
319 ++sym; \ 429 ++sym; \
320 } \ 430 } \
321 printf(" in "); \ 431 printf(" in "); \
322 if (func && func->st_name) \ 432 if (func && func->st_name) { \
323 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \ 433 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
434 if (r_offset > EGET(func->st_size)) \
435 printf("(optimized out: previous %s)", func_name); \
324 else \ 436 else \
325 printf("(NULL: fake?)"); \ 437 printf("%s", func_name); \
438 } else \
439 printf("(optimized out)"); \
326 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \ 440 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
441 if (be_verbose && has_objdump) { \
442 char *sysbuf; \
443 size_t syslen; \
444 const char sysfmt[] = "objdump -r -R -d -w -l --start-address=0x%lX --stop-address=0x%lX %s | grep --color -i -C 3 '.*[[:space:]]%lX:[[:space:]]*R_.*'\n"; \
445 syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
446 sysbuf = xmalloc(syslen); \
447 if (sysbuf) { \
448 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
449 if (end_addr < r_offset) \
450 /* not uncommon when things are optimized out */ \
451 end_addr = r_offset + 0x100; \
452 snprintf(sysbuf, syslen, sysfmt, \
453 (unsigned long)offset_tmp, \
454 (unsigned long)end_addr, \
455 elf->filename, \
456 (unsigned long)r_offset); \
457 fflush(stdout); \
458 system(sysbuf); \
459 fflush(stdout); \
460 free(sysbuf); \
461 } \
462 } \
327 } \ 463 } \
328 } } 464 } }
329 SHOW_TEXTRELS(32) 465 SHOW_TEXTRELS(32)
330 SHOW_TEXTRELS(64) 466 SHOW_TEXTRELS(64)
331 } 467 }
333 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename); 469 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
334 470
335 return NULL; 471 return NULL;
336} 472}
337 473
338static void rpath_security_checks(elfobj *, char *); 474static void rpath_security_checks(elfobj *, char *, const char *);
339static void rpath_security_checks(elfobj *elf, char *item) { 475static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
476{
340 struct stat st; 477 struct stat st;
341 switch (*item) { 478 switch (*item) {
479 case '/': break;
342 case 0: 480 case '.':
343 warnf("Security problem NULL RPATH in %s", elf->filename); 481 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
344 break; 482 break;
345 case '/': break; 483 case ':':
484 case '\0':
485 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
486 break;
346 case '$': 487 case '$':
347 if (fstat(elf->fd, &st) != -1) 488 if (fstat(elf->fd, &st) != -1)
348 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID)) 489 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
349 warnf("Security problem with RPATH='%s' in %s with mode set of %o", 490 warnf("Security problem with %s='%s' in %s with mode set of %o",
350 item, elf->filename, st.st_mode & 07777); 491 dt_type, item, elf->filename, st.st_mode & 07777);
351 break; 492 break;
352 default: 493 default:
353 warnf("Maybe? sec problem with RPATH='%s' in %s", item, elf->filename); 494 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
354 break; 495 break;
355 } 496 }
356} 497}
357static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len) 498static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
358{ 499{
394 /* Verify the memory is somewhat sane */ \ 535 /* Verify the memory is somewhat sane */ \
395 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 536 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
396 if (offset < (Elf ## B ## _Off)elf->len) { \ 537 if (offset < (Elf ## B ## _Off)elf->len) { \
397 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \ 538 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
398 *r = (char*)(elf->data + offset); \ 539 *r = (char*)(elf->data + offset); \
540 /* cache the length in case we need to nuke this section later on */ \
541 if (fix_elf) \
542 offset = strlen(*r); \
399 /* If quiet, don't output paths in ld.so.conf */ \ 543 /* If quiet, don't output paths in ld.so.conf */ \
400 if (be_quiet) { \ 544 if (be_quiet) { \
401 size_t len; \ 545 size_t len; \
402 char *start, *end; \ 546 char *start, *end; \
403 /* note that we only 'chop' off leading known paths. */ \ 547 /* note that we only 'chop' off leading known paths. */ \
404 /* since *r is read-only memory, we can only move the ptr forward. */ \ 548 /* since *r is read-only memory, we can only move the ptr forward. */ \
405 start = *r; \ 549 start = *r; \
406 /* scan each path in : delimited list */ \ 550 /* scan each path in : delimited list */ \
407 while (start) { \ 551 while (start) { \
408 rpath_security_checks(elf, start); \ 552 rpath_security_checks(elf, start, get_elfdtype(word)); \
409 end = strchr(start, ':'); \ 553 end = strchr(start, ':'); \
410 len = (end ? abs(end - start) : strlen(start)); \ 554 len = (end ? abs(end - start) : strlen(start)); \
555 if (use_ldcache) \
411 for (s = 0; ldpaths[s]; ++s) { \ 556 for (s = 0; ldpaths[s]; ++s) \
412 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \ 557 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
413 *r = (end ? end + 1 : NULL); \ 558 *r = end; \
559 /* corner case ... if RPATH reads "/usr/lib:", we want \
560 * to show ':' rather than '' */ \
561 if (end && end[1] != '\0') \
562 (*r)++; \
414 break; \ 563 break; \
415 } \ 564 } \
416 } \
417 if (!*r || !ldpaths[s] || !end) \ 565 if (!*r || !end) \
418 start = NULL; \ 566 break; \
419 else \ 567 else \
420 start = start + len + 1; \ 568 start = start + len + 1; \
421 } \ 569 } \
422 } \ 570 } \
571 if (*r) { \
572 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
573 /* just nuke it */ \
574 nuke_it##B: \
575 memset(*r, 0x00, offset); \
576 *r = NULL; \
577 ESET(dyn->d_tag, DT_DEBUG); \
578 ESET(dyn->d_un.d_ptr, 0); \
579 } else if (fix_elf) { \
580 /* try to clean "bad" paths */ \
581 size_t len, tmpdir_len; \
582 char *start, *end; \
583 const char *tmpdir; \
584 start = *r; \
585 tmpdir = (getenv("TMPDIR") ? : "."); \
586 tmpdir_len = strlen(tmpdir); \
587 while (1) { \
588 end = strchr(start, ':'); \
589 if (start == end) { \
590 eat_this_path##B: \
591 len = strlen(end); \
592 memmove(start, end+1, len); \
593 start[len-1] = '\0'; \
594 end = start - 1; \
595 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
596 if (!end) { \
597 if (start == *r) \
598 goto nuke_it##B; \
599 *--start = '\0'; \
600 } else \
601 goto eat_this_path##B; \
602 } \
603 if (!end) \
604 break; \
605 start = end + 1; \
606 } \
607 if (**r == '\0') \
608 goto nuke_it##B; \
609 } \
610 if (*r) \
423 if (*r) *found_rpath = 1; \ 611 *found_rpath = 1; \
612 } \
424 } \ 613 } \
425 ++dyn; \ 614 ++dyn; \
426 } \ 615 } \
427 } } 616 } }
428 SHOW_RPATH(32) 617 SHOW_RPATH(32)
445 } else if (rpath || runpath) 634 } else if (rpath || runpath)
446 xstrcat(ret, (runpath ? runpath : rpath), ret_len); 635 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
447 else if (!be_quiet) 636 else if (!be_quiet)
448 xstrcat(ret, " - ", ret_len); 637 xstrcat(ret, " - ", ret_len);
449} 638}
639
640#define LDSO_CACHE_MAGIC "ld.so-"
641#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
642#define LDSO_CACHE_VER "1.7.0"
643#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
644#define FLAG_ANY -1
645#define FLAG_TYPE_MASK 0x00ff
646#define FLAG_LIBC4 0x0000
647#define FLAG_ELF 0x0001
648#define FLAG_ELF_LIBC5 0x0002
649#define FLAG_ELF_LIBC6 0x0003
650#define FLAG_REQUIRED_MASK 0xff00
651#define FLAG_SPARC_LIB64 0x0100
652#define FLAG_IA64_LIB64 0x0200
653#define FLAG_X8664_LIB64 0x0300
654#define FLAG_S390_LIB64 0x0400
655#define FLAG_POWERPC_LIB64 0x0500
656#define FLAG_MIPS64_LIBN32 0x0600
657#define FLAG_MIPS64_LIBN64 0x0700
658
659static char *lookup_cache_lib(elfobj *, char *);
660
661#if defined(__GLIBC__) || defined(__UCLIBC__)
662
663static char *lookup_cache_lib(elfobj *elf, char *fname)
664{
665 int fd = 0;
666 char *strs;
667 static char buf[__PAX_UTILS_PATH_MAX] = "";
668 const char *cachefile = "/etc/ld.so.cache";
669 struct stat st;
670
671 typedef struct {
672 char magic[LDSO_CACHE_MAGIC_LEN];
673 char version[LDSO_CACHE_VER_LEN];
674 int nlibs;
675 } header_t;
676 header_t *header;
677
678 typedef struct {
679 int flags;
680 int sooffset;
681 int liboffset;
682 } libentry_t;
683 libentry_t *libent;
684
685 if (fname == NULL)
686 return NULL;
687
688 if (ldcache == 0) {
689 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1)
690 return NULL;
691
692 /* cache these values so we only map/unmap the cache file once */
693 ldcache_size = st.st_size;
694 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
695
696 close(fd);
697
698 if (ldcache == (caddr_t)-1) {
699 ldcache = 0;
700 return NULL;
701 }
702
703 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
704 return NULL;
705 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
706 return NULL;
707 }
708
709 header = (header_t *) ldcache;
710 libent = (libentry_t *) (ldcache + sizeof(header_t));
711 strs = (char *) &libent[header->nlibs];
712
713 for (fd = 0; fd < header->nlibs; fd++) {
714 /* this should be more fine grained, but for now we assume that
715 * diff arches will not be cached together. and we ignore the
716 * the different multilib mips cases. */
717 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
718 continue;
719 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
720 continue;
721
722 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
723 continue;
724 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
725 }
726 return buf;
727}
728#elif defined(__NetBSD__)
729static char *lookup_cache_lib(elfobj *elf, char *fname)
730{
731 static char buf[__PAX_UTILS_PATH_MAX] = "";
732 static struct stat st;
733
734 char **ldpath;
735 for (ldpath = ldpaths; *ldpath != NULL; ldpath++) {
736 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", *ldpath, fname) >= sizeof(buf))
737 continue; /* if the pathname is too long, or something went wrong, ignore */
738
739 if (stat(buf, &st) != 0)
740 continue; /* if the lib doesn't exist in *ldpath, look further */
741
742 /* NetBSD doesn't actually do sanity checks, it just loads the file
743 * and if that doesn't work, continues looking in other directories.
744 * This cannot easily be safely emulated, unfortunately. For now,
745 * just assume that if it exists, it's a valid library. */
746
747 return buf;
748 }
749
750 /* not found in any path */
751 return NULL;
752}
753#else
754#warning Cache support not implemented for your target
755static char *lookup_cache_lib(elfobj *elf, char *fname)
756{
757 return NULL;
758}
759#endif
760
450static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len) 761static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
451{ 762{
452 unsigned long i; 763 unsigned long i;
453 char *needed; 764 char *needed;
454 void *strtbl_void; 765 void *strtbl_void;
766 char *p;
455 767
456 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL; 768 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
457 769
458 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 770 strtbl_void = elf_findsecbyname(elf, ".dynstr");
459 771
479 } \ 791 } \
480 needed = (char*)(elf->data + offset); \ 792 needed = (char*)(elf->data + offset); \
481 if (op == 0) { \ 793 if (op == 0) { \
482 if (!be_wewy_wewy_quiet) { \ 794 if (!be_wewy_wewy_quiet) { \
483 if (*found_needed) xchrcat(ret, ',', ret_len); \ 795 if (*found_needed) xchrcat(ret, ',', ret_len); \
796 if (use_ldcache) \
797 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
798 needed = p; \
484 xstrcat(ret, needed, ret_len); \ 799 xstrcat(ret, needed, ret_len); \
485 } \ 800 } \
486 *found_needed = 1; \ 801 *found_needed = 1; \
487 } else { \ 802 } else { \
488 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \ 803 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \
524} 839}
525static char *scanelf_file_bind(elfobj *elf, char *found_bind) 840static char *scanelf_file_bind(elfobj *elf, char *found_bind)
526{ 841{
527 unsigned long i; 842 unsigned long i;
528 struct stat s; 843 struct stat s;
844 char dynamic = 0;
529 845
530 if (!show_bind) return NULL; 846 if (!show_bind) return NULL;
531 if (!elf->phdr) return NULL; 847 if (!elf->phdr) return NULL;
532 848
533#define SHOW_BIND(B) \ 849#define SHOW_BIND(B) \
536 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 852 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
537 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 853 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
538 Elf ## B ## _Off offset; \ 854 Elf ## B ## _Off offset; \
539 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 855 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
540 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 856 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
857 dynamic = 1; \
541 offset = EGET(phdr[i].p_offset); \ 858 offset = EGET(phdr[i].p_offset); \
542 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 859 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
543 dyn = DYN ## B (elf->data + offset); \ 860 dyn = DYN ## B (elf->data + offset); \
544 while (EGET(dyn->d_tag) != DT_NULL) { \ 861 while (EGET(dyn->d_tag) != DT_NULL) { \
545 if (EGET(dyn->d_tag) == DT_BIND_NOW || \ 862 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
556 SHOW_BIND(32) 873 SHOW_BIND(32)
557 SHOW_BIND(64) 874 SHOW_BIND(64)
558 875
559 if (be_wewy_wewy_quiet) return NULL; 876 if (be_wewy_wewy_quiet) return NULL;
560 877
878 /* don't output anything if quiet mode and the ELF is static or not setuid */
561 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) { 879 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
562 return NULL; 880 return NULL;
563 } else { 881 } else {
564 *found_bind = 1; 882 *found_bind = 1;
565 return (char *) "LAZY"; 883 return (char *) (dynamic ? "LAZY" : "STATIC");
566 } 884 }
567} 885}
568static char *scanelf_file_soname(elfobj *elf, char *found_soname) 886static char *scanelf_file_soname(elfobj *elf, char *found_soname)
569{ 887{
570 unsigned long i; 888 unsigned long i;
612 return NULL; 930 return NULL;
613} 931}
614static char *scanelf_file_sym(elfobj *elf, char *found_sym) 932static char *scanelf_file_sym(elfobj *elf, char *found_sym)
615{ 933{
616 unsigned long i; 934 unsigned long i;
935 char *ret;
617 void *symtab_void, *strtab_void; 936 void *symtab_void, *strtab_void;
618 937
619 if (!find_sym) return NULL; 938 if (!find_sym) return NULL;
939 ret = find_sym;
620 940
621 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void); 941 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
622 942
623 if (symtab_void && strtab_void) { 943 if (symtab_void && strtab_void) {
624#define FIND_SYM(B) \ 944#define FIND_SYM(B) \
625 if (elf->elf_class == ELFCLASS ## B) { \ 945 if (elf->elf_class == ELFCLASS ## B) { \
626 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 946 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
627 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 947 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
628 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 948 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
629 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 949 unsigned long cnt = EGET(symtab->sh_entsize); \
630 char *symname; \ 950 char *symname; \
951 if (cnt) \
952 cnt = EGET(symtab->sh_size) / cnt; \
631 for (i = 0; i < cnt; ++i) { \ 953 for (i = 0; i < cnt; ++i) { \
632 if (sym->st_name) { \ 954 if (sym->st_name) { \
955 /* make sure the symbol name is in acceptable memory range */ \
633 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 956 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
957 if ((void*)symname > (void*)elf->data_end) { \
958 warnf("%s: corrupt ELF symbols", elf->filename); \
959 ++sym; \
960 continue; \
961 } \
962 /* debug display ... show all symbols and some extra info */ \
634 if (*find_sym == '*') { \ 963 if (*ret == '*') { \
635 printf("%s(%s) %5lX %15s %s\n", \ 964 printf("%s(%s) %5lX %15s %s\n", \
636 ((*found_sym == 0) ? "\n\t" : "\t"), \ 965 ((*found_sym == 0) ? "\n\t" : "\t"), \
637 elf->base_filename, \ 966 elf->base_filename, \
638 (long)sym->st_size, \ 967 (unsigned long)sym->st_size, \
639 (char *)get_elfstttype(sym->st_info), \ 968 get_elfstttype(sym->st_info), \
640 symname); \ 969 symname); \
641 *found_sym = 1; \ 970 *found_sym = 1; \
642 } else if ((strcmp(find_sym, symname) == 0) || \ 971 } else { \
643 (strcmp(symname, versioned_symname) == 0)) \ 972 /* allow the user to specify a comma delimited list of symbols to search for */ \
973 char *this_sym, *this_sym_ver, *next_sym; \
974 this_sym = ret; \
975 this_sym_ver = versioned_symname; \
976 do { \
977 next_sym = strchr(this_sym, ','); \
978 if (next_sym == NULL) \
979 next_sym = this_sym + strlen(this_sym); \
980 /* do we want a defined symbol ? */ \
981 if (*this_sym == '+') { \
982 if (sym->st_shndx == SHN_UNDEF) \
983 goto skip_this_sym##B; \
984 ++this_sym; \
985 ++this_sym_ver; \
986 /* do we want an undefined symbol ? */ \
987 } else if (*this_sym == '-') { \
988 if (sym->st_shndx != SHN_UNDEF) \
989 goto skip_this_sym##B; \
990 ++this_sym; \
991 ++this_sym_ver; \
992 } \
993 /* ok, lets compare the name now */ \
994 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
995 (strncmp(this_sym_ver, symname, strlen(this_sym_ver)) == 0)) { \
996 if (be_semi_verbose) { \
997 char buf[126]; \
998 snprintf(buf, sizeof(buf), "%lX %s %s", \
999 (unsigned long)sym->st_size, get_elfstttype(sym->st_info), this_sym); \
1000 ret = buf; \
1001 } else \
1002 ret = this_sym; \
644 (*found_sym)++; \ 1003 (*found_sym)++; \
1004 goto break_out; \
1005 } \
1006 skip_this_sym##B: this_sym = next_sym + 1; \
1007 } while (*next_sym != '\0'); \
1008 } \
645 } \ 1009 } \
646 ++sym; \ 1010 ++sym; \
647 } } 1011 } }
648 FIND_SYM(32) 1012 FIND_SYM(32)
649 FIND_SYM(64) 1013 FIND_SYM(64)
650 } 1014 }
651 1015
1016break_out:
652 if (be_wewy_wewy_quiet) return NULL; 1017 if (be_wewy_wewy_quiet) return NULL;
653 1018
654 if (*find_sym != '*' && *found_sym) 1019 if (*find_sym != '*' && *found_sym)
655 return find_sym; 1020 return ret;
656 if (be_quiet) 1021 if (be_quiet)
657 return NULL; 1022 return NULL;
658 else 1023 else
659 return (char *)" - "; 1024 return (char *)" - ";
660} 1025}
1026
1027
1028static char *scanelf_file_sections(elfobj *elf, char *found_section)
1029{
1030 if (!find_section)
1031 return NULL;
1032
1033#define FIND_SECTION(B) \
1034 if (elf->elf_class == ELFCLASS ## B) { \
1035 int invert; \
1036 Elf ## B ## _Shdr *section; \
1037 invert = (*find_section == '!' ? 1 : 0); \
1038 section = SHDR ## B (elf_findsecbyname(elf, find_section+invert)); \
1039 if ((section == NULL && invert) || (section != NULL && !invert)) \
1040 *found_section = 1; \
1041 }
1042 FIND_SECTION(32)
1043 FIND_SECTION(64)
1044
1045 if (be_wewy_wewy_quiet)
1046 return NULL;
1047
1048 if (*found_section)
1049 return find_section;
1050
1051 if (be_quiet)
1052 return NULL;
1053 else
1054 return (char *)" - ";
1055}
1056
661/* scan an elf file and show all the fun stuff */ 1057/* scan an elf file and show all the fun stuff */
662#define prints(str) write(fileno(stdout), str, strlen(str)) 1058#define prints(str) write(fileno(stdout), str, strlen(str))
663static void scanelf_file(const char *filename) 1059static int scanelf_elfobj(elfobj *elf)
664{ 1060{
665 unsigned long i; 1061 unsigned long i;
666 char found_pax, found_phdr, found_relro, found_load, found_textrel, 1062 char found_pax, found_phdr, found_relro, found_load, found_textrel,
667 found_rpath, found_needed, found_interp, found_bind, found_soname, 1063 found_rpath, found_needed, found_interp, found_bind, found_soname,
668 found_sym, found_lib, found_file, found_textrels; 1064 found_sym, found_lib, found_file, found_textrels, found_section;
669 elfobj *elf;
670 struct stat st;
671 static char *out_buffer = NULL; 1065 static char *out_buffer = NULL;
672 static size_t out_len; 1066 static size_t out_len;
673 1067
674 /* make sure 'filename' exists */
675 if (lstat(filename, &st) == -1) {
676 if (be_verbose > 2) printf("%s: does not exist\n", filename);
677 return;
678 }
679 /* always handle regular files and handle symlinked files if no -y */
680 if (S_ISLNK(st.st_mode)) {
681 if (!scan_symlink) return;
682 stat(filename, &st);
683 }
684 if (!S_ISREG(st.st_mode)) {
685 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
686 return;
687 }
688
689 found_pax = found_phdr = found_relro = found_load = found_textrel = \ 1068 found_pax = found_phdr = found_relro = found_load = found_textrel = \
690 found_rpath = found_needed = found_interp = found_bind = found_soname = \ 1069 found_rpath = found_needed = found_interp = found_bind = found_soname = \
691 found_sym = found_lib = found_file = found_textrels = 0; 1070 found_sym = found_lib = found_file = found_textrels = found_section = 0;
692 1071
693 /* verify this is real ELF */
694 if ((elf = readelf(filename)) == NULL) {
695 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
696 return;
697 }
698
699 if (be_verbose > 1) 1072 if (be_verbose > 2)
700 printf("%s: scanning file {%s,%s}\n", filename, 1073 printf("%s: scanning file {%s,%s}\n", elf->filename,
701 get_elfeitype(EI_CLASS, elf->elf_class), 1074 get_elfeitype(EI_CLASS, elf->elf_class),
702 get_elfeitype(EI_DATA, elf->data[EI_DATA])); 1075 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
703 else if (be_verbose) 1076 else if (be_verbose > 1)
704 printf("%s: scanning file\n", filename); 1077 printf("%s: scanning file\n", elf->filename);
705 1078
706 /* init output buffer */ 1079 /* init output buffer */
707 if (!out_buffer) { 1080 if (!out_buffer) {
708 out_len = sizeof(char) * 80; 1081 out_len = sizeof(char) * 80;
709 out_buffer = (char*)xmalloc(out_len); 1082 out_buffer = (char*)xmalloc(out_len);
714 if (!be_quiet && show_banner) { 1087 if (!be_quiet && show_banner) {
715 for (i = 0; out_format[i]; ++i) { 1088 for (i = 0; out_format[i]; ++i) {
716 if (!IS_MODIFIER(out_format[i])) continue; 1089 if (!IS_MODIFIER(out_format[i])) continue;
717 1090
718 switch (out_format[++i]) { 1091 switch (out_format[++i]) {
1092 case '+': break;
719 case '%': break; 1093 case '%': break;
720 case '#': break; 1094 case '#': break;
721 case 'F': 1095 case 'F':
722 case 'p': 1096 case 'p':
723 case 'f': prints("FILE "); found_file = 1; break; 1097 case 'f': prints("FILE "); found_file = 1; break;
724 case 'o': prints(" TYPE "); break; 1098 case 'o': prints(" TYPE "); break;
725 case 'x': prints(" PAX "); break; 1099 case 'x': prints(" PAX "); break;
726 case 'e': prints("STK/REL/PTL "); break; 1100 case 'e': prints("STK/REL/PTL "); break;
727 case 't': prints("TEXTREL "); break; 1101 case 't': prints("TEXTREL "); break;
728 case 'r': prints("RPATH "); break; 1102 case 'r': prints("RPATH "); break;
1103 case 'M': prints("CLASS "); break;
729 case 'n': prints("NEEDED "); break; 1104 case 'n': prints("NEEDED "); break;
730 case 'i': prints("INTERP "); break; 1105 case 'i': prints("INTERP "); break;
731 case 'b': prints("BIND "); break; 1106 case 'b': prints("BIND "); break;
732 case 'S': prints("SONAME "); break; 1107 case 'S': prints("SONAME "); break;
733 case 's': prints("SYM "); break; 1108 case 's': prints("SYM "); break;
734 case 'N': prints("LIB "); break; 1109 case 'N': prints("LIB "); break;
735 case 'T': prints("TEXTRELS "); break; 1110 case 'T': prints("TEXTRELS "); break;
1111 case 'k': prints("SECTION "); break;
1112 case 'a': prints("ARCH "); break;
736 default: warnf("'%c' has no title ?", out_format[i]); 1113 default: warnf("'%c' has no title ?", out_format[i]);
737 } 1114 }
738 } 1115 }
739 if (!found_file) prints("FILE "); 1116 if (!found_file) prints("FILE ");
740 prints("\n"); 1117 prints("\n");
745 /* dump all the good stuff */ 1122 /* dump all the good stuff */
746 for (i = 0; out_format[i]; ++i) { 1123 for (i = 0; out_format[i]; ++i) {
747 const char *out; 1124 const char *out;
748 const char *tmp; 1125 const char *tmp;
749 1126
750 /* make sure we trim leading spaces in quiet mode */
751 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
752 *out_buffer = '\0';
753
754 if (!IS_MODIFIER(out_format[i])) { 1127 if (!IS_MODIFIER(out_format[i])) {
755 xchrcat(&out_buffer, out_format[i], &out_len); 1128 xchrcat(&out_buffer, out_format[i], &out_len);
756 continue; 1129 continue;
757 } 1130 }
758 1131
759 out = NULL; 1132 out = NULL;
760 be_wewy_wewy_quiet = (out_format[i] == '#'); 1133 be_wewy_wewy_quiet = (out_format[i] == '#');
1134 be_semi_verbose = (out_format[i] == '+');
761 switch (out_format[++i]) { 1135 switch (out_format[++i]) {
1136 case '+':
762 case '%': 1137 case '%':
763 case '#': 1138 case '#':
764 xchrcat(&out_buffer, out_format[i], &out_len); break; 1139 xchrcat(&out_buffer, out_format[i], &out_len); break;
765 case 'F': 1140 case 'F':
766 found_file = 1; 1141 found_file = 1;
767 if (be_wewy_wewy_quiet) break; 1142 if (be_wewy_wewy_quiet) break;
768 xstrcat(&out_buffer, filename, &out_len); 1143 xstrcat(&out_buffer, elf->filename, &out_len);
769 break; 1144 break;
770 case 'p': 1145 case 'p':
771 found_file = 1; 1146 found_file = 1;
772 if (be_wewy_wewy_quiet) break; 1147 if (be_wewy_wewy_quiet) break;
773 tmp = filename; 1148 tmp = elf->filename;
774 if (search_path) { 1149 if (search_path) {
775 ssize_t len_search = strlen(search_path); 1150 ssize_t len_search = strlen(search_path);
776 ssize_t len_file = strlen(filename); 1151 ssize_t len_file = strlen(elf->filename);
777 if (!strncmp(filename, search_path, len_search) && \ 1152 if (!strncmp(elf->filename, search_path, len_search) && \
778 len_file > len_search) 1153 len_file > len_search)
779 tmp += len_search; 1154 tmp += len_search;
780 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++; 1155 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
781 } 1156 }
782 xstrcat(&out_buffer, tmp, &out_len); 1157 xstrcat(&out_buffer, tmp, &out_len);
783 break; 1158 break;
784 case 'f': 1159 case 'f':
785 found_file = 1; 1160 found_file = 1;
786 if (be_wewy_wewy_quiet) break; 1161 if (be_wewy_wewy_quiet) break;
787 tmp = strrchr(filename, '/'); 1162 tmp = strrchr(elf->filename, '/');
788 tmp = (tmp == NULL ? filename : tmp+1); 1163 tmp = (tmp == NULL ? elf->filename : tmp+1);
789 xstrcat(&out_buffer, tmp, &out_len); 1164 xstrcat(&out_buffer, tmp, &out_len);
790 break; 1165 break;
791 case 'o': out = get_elfetype(elf); break; 1166 case 'o': out = get_elfetype(elf); break;
792 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1167 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
793 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break; 1168 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
794 case 't': out = scanelf_file_textrel(elf, &found_textrel); break; 1169 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
795 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break; 1170 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
796 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break; 1171 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1172 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
797 case 'n': 1173 case 'n':
798 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break; 1174 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
799 case 'i': out = scanelf_file_interp(elf, &found_interp); break; 1175 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
800 case 'b': out = scanelf_file_bind(elf, &found_bind); break; 1176 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
801 case 'S': out = scanelf_file_soname(elf, &found_soname); break; 1177 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
802 case 's': out = scanelf_file_sym(elf, &found_sym); break; 1178 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1179 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1180 case 'a': out = get_elfemtype(elf); break;
803 default: warnf("'%c' has no scan code?", out_format[i]); 1181 default: warnf("'%c' has no scan code?", out_format[i]);
804 } 1182 }
1183 if (out) {
1184 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
1185 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
1186 xstrncat(&out_buffer, out, &out_len, (tmp-out));
1187 else
805 if (out) xstrcat(&out_buffer, out, &out_len); 1188 xstrcat(&out_buffer, out, &out_len);
1189 }
806 } 1190 }
807 1191
808#define FOUND_SOMETHING() \ 1192#define FOUND_SOMETHING() \
809 (found_pax || found_phdr || found_relro || found_load || found_textrel || \ 1193 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
810 found_rpath || found_needed || found_interp || found_bind || \ 1194 found_rpath || found_needed || found_interp || found_bind || \
811 found_soname || found_sym || found_lib || found_textrels) 1195 found_soname || found_sym || found_lib || found_textrels || found_section )
812 1196
813 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) { 1197 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
814 xchrcat(&out_buffer, ' ', &out_len); 1198 xchrcat(&out_buffer, ' ', &out_len);
815 xstrcat(&out_buffer, filename, &out_len); 1199 xstrcat(&out_buffer, elf->filename, &out_len);
816 } 1200 }
817 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) { 1201 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
818 puts(out_buffer); 1202 puts(out_buffer);
819 fflush(stdout); 1203 fflush(stdout);
820 } 1204 }
821 1205
1206 return 0;
1207}
1208
1209/* scan a single elf */
1210static int scanelf_elf(const char *filename, int fd, size_t len)
1211{
1212 int ret = 1;
1213 elfobj *elf;
1214
1215 /* verify this is real ELF */
1216 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1217 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1218 return ret;
1219 }
1220 switch (match_bits) {
1221 case 32:
1222 if (elf->elf_class != ELFCLASS32)
1223 goto label_done;
1224 break;
1225 case 64:
1226 if (elf->elf_class != ELFCLASS64)
1227 goto label_done;
1228 break;
1229 default: break;
1230 }
1231 if (strlen(match_etypes)) {
1232 char sbuf[126];
1233 strncpy(sbuf, match_etypes, sizeof(sbuf));
1234 if (strchr(match_etypes, ',') != NULL) {
1235 char *p;
1236 while((p = strrchr(sbuf, ',')) != NULL) {
1237 *p = 0;
1238 if (etype_lookup(p+1) == get_etype(elf))
1239 goto label_ret;
1240 }
1241 }
1242 if (etype_lookup(sbuf) != get_etype(elf))
1243 goto label_done;
1244 }
1245
1246label_ret:
1247 ret = scanelf_elfobj(elf);
1248
1249label_done:
822 unreadelf(elf); 1250 unreadelf(elf);
1251 return ret;
1252}
1253
1254/* scan an archive of elfs */
1255static int scanelf_archive(const char *filename, int fd, size_t len)
1256{
1257 archive_handle *ar;
1258 archive_member *m;
1259 char *ar_buffer;
1260 elfobj *elf;
1261
1262 ar = ar_open_fd(filename, fd);
1263 if (ar == NULL)
1264 return 1;
1265
1266 ar_buffer = (char*)mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1267 while ((m=ar_next(ar)) != NULL) {
1268 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size);
1269 if (elf) {
1270 scanelf_elfobj(elf);
1271 unreadelf(elf);
1272 }
1273 }
1274 munmap(ar_buffer, len);
1275
1276 return 0;
1277}
1278/* scan a file which may be an elf or an archive or some other magical beast */
1279static int scanelf_file(const char *filename, const struct stat *st_cache)
1280{
1281 const struct stat *st = st_cache;
1282 struct stat symlink_st;
1283 int fd;
1284
1285 /* always handle regular files and handle symlinked files if no -y */
1286 if (S_ISLNK(st->st_mode)) {
1287 if (!scan_symlink) return 1;
1288 stat(filename, &symlink_st);
1289 st = &symlink_st;
1290 }
1291
1292 if (!S_ISREG(st->st_mode)) {
1293 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1294 return 1;
1295 }
1296
1297 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1298 return 1;
1299
1300 if (scanelf_elf(filename, fd, st->st_size) == 1 && scan_archives)
1301 /* if it isn't an ELF, maybe it's an .a archive */
1302 scanelf_archive(filename, fd, st->st_size);
1303
1304 close(fd);
1305 return 0;
823} 1306}
824 1307
825/* scan a directory for ET_EXEC files and print when we find one */ 1308/* scan a directory for ET_EXEC files and print when we find one */
826static void scanelf_dir(const char *path) 1309static int scanelf_dir(const char *path)
827{ 1310{
828 register DIR *dir; 1311 register DIR *dir;
829 register struct dirent *dentry; 1312 register struct dirent *dentry;
830 struct stat st_top, st; 1313 struct stat st_top, st;
831 char buf[_POSIX_PATH_MAX]; 1314 char buf[__PAX_UTILS_PATH_MAX];
832 size_t pathlen = 0, len = 0; 1315 size_t pathlen = 0, len = 0;
1316 int ret = 0;
833 1317
834 /* make sure path exists */ 1318 /* make sure path exists */
835 if (lstat(path, &st_top) == -1) { 1319 if (lstat(path, &st_top) == -1) {
836 if (be_verbose > 2) printf("%s: does not exist\n", path); 1320 if (be_verbose > 2) printf("%s: does not exist\n", path);
837 return; 1321 return 1;
838 } 1322 }
839 1323
840 /* ok, if it isn't a directory, assume we can open it */ 1324 /* ok, if it isn't a directory, assume we can open it */
841 if (!S_ISDIR(st_top.st_mode)) { 1325 if (!S_ISDIR(st_top.st_mode)) {
842 scanelf_file(path); 1326 return scanelf_file(path, &st_top);
843 return;
844 } 1327 }
845 1328
846 /* now scan the dir looking for fun stuff */ 1329 /* now scan the dir looking for fun stuff */
847 if ((dir = opendir(path)) == NULL) { 1330 if ((dir = opendir(path)) == NULL) {
848 warnf("could not opendir %s: %s", path, strerror(errno)); 1331 warnf("could not opendir %s: %s", path, strerror(errno));
849 return; 1332 return 1;
850 } 1333 }
851 if (be_verbose) printf("%s: scanning dir\n", path); 1334 if (be_verbose > 1) printf("%s: scanning dir\n", path);
852 1335
853 pathlen = strlen(path); 1336 pathlen = strlen(path);
854 while ((dentry = readdir(dir))) { 1337 while ((dentry = readdir(dir))) {
855 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1338 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
856 continue; 1339 continue;
858 if (len >= sizeof(buf)) { 1341 if (len >= sizeof(buf)) {
859 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path, 1342 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
860 (unsigned long)len, (unsigned long)sizeof(buf)); 1343 (unsigned long)len, (unsigned long)sizeof(buf));
861 continue; 1344 continue;
862 } 1345 }
863 sprintf(buf, "%s/%s", path, dentry->d_name); 1346 snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name);
864 if (lstat(buf, &st) != -1) { 1347 if (lstat(buf, &st) != -1) {
865 if (S_ISREG(st.st_mode)) 1348 if (S_ISREG(st.st_mode))
866 scanelf_file(buf); 1349 ret = scanelf_file(buf, &st);
867 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1350 else if (dir_recurse && S_ISDIR(st.st_mode)) {
868 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1351 if (dir_crossmount || (st_top.st_dev == st.st_dev))
869 scanelf_dir(buf); 1352 ret = scanelf_dir(buf);
870 } 1353 }
871 } 1354 }
872 } 1355 }
873 closedir(dir); 1356 closedir(dir);
1357 return ret;
874} 1358}
875 1359
876static int scanelf_from_file(char *filename) 1360static int scanelf_from_file(const char *filename)
877{ 1361{
878 FILE *fp = NULL; 1362 FILE *fp = NULL;
879 char *p; 1363 char *p;
880 char path[_POSIX_PATH_MAX]; 1364 char path[__PAX_UTILS_PATH_MAX];
1365 int ret = 0;
881 1366
882 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL)) 1367 if (strcmp(filename, "-") == 0)
883 fp = stdin; 1368 fp = stdin;
884 else if ((fp = fopen(filename, "r")) == NULL) 1369 else if ((fp = fopen(filename, "r")) == NULL)
885 return 1; 1370 return 1;
886 1371
887 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1372 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
888 if ((p = strchr(path, '\n')) != NULL) 1373 if ((p = strchr(path, '\n')) != NULL)
889 *p = 0; 1374 *p = 0;
890 search_path = path; 1375 search_path = path;
891 scanelf_dir(path); 1376 ret = scanelf_dir(path);
892 } 1377 }
893 if (fp != stdin) 1378 if (fp != stdin)
894 fclose(fp); 1379 fclose(fp);
895 return 0; 1380 return ret;
896} 1381}
897 1382
898static void load_ld_so_conf() 1383#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1384
1385static int load_ld_cache_config(int i, const char *fname)
899{ 1386{
900 FILE *fp = NULL; 1387 FILE *fp = NULL;
901 char *p; 1388 char *p;
902 char path[_POSIX_PATH_MAX]; 1389 char path[__PAX_UTILS_PATH_MAX];
903 int i = 0;
904 1390
905 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1391 if (i + 1 == ARRAY_SIZE(ldpaths))
906 return; 1392 return i;
907 1393
1394 if ((fp = fopen(fname, "r")) == NULL)
1395 return i;
1396
908 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1397 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
909 if (*path != '/')
910 continue;
911
912 if ((p = strrchr(path, '\r')) != NULL) 1398 if ((p = strrchr(path, '\r')) != NULL)
913 *p = 0; 1399 *p = 0;
914 if ((p = strchr(path, '\n')) != NULL) 1400 if ((p = strchr(path, '\n')) != NULL)
915 *p = 0; 1401 *p = 0;
1402#ifdef __linux__
1403 // recursive includes of the same file will make this segfault.
1404 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1405 glob64_t gl;
1406 size_t x;
1407 char gpath[__PAX_UTILS_PATH_MAX];
1408
1409 memset(gpath, 0, sizeof(gpath));
1410
1411 if (path[8] != '/')
1412 snprintf(gpath, sizeof(gpath), "/etc/%s", &path[8]);
1413 else
1414 strncpy(gpath, &path[8], sizeof(gpath));
1415
1416 if ((glob64(gpath, 0, NULL, &gl)) == 0) {
1417 for (x = 0; x < gl.gl_pathc; ++x) {
1418 /* try to avoid direct loops */
1419 if (strcmp(gl.gl_pathv[x], fname) == 0)
1420 continue;
1421 i = load_ld_cache_config(i, gl.gl_pathv[x]);
1422 if (i + 1 >= ARRAY_SIZE(ldpaths)) {
1423 globfree64(&gl);
1424 return i;
1425 }
1426 }
1427 globfree64 (&gl);
1428 continue;
1429 }
1430 }
1431#endif
1432 if (*path != '/')
1433 continue;
916 1434
917 ldpaths[i++] = xstrdup(path); 1435 ldpaths[i++] = xstrdup(path);
918 1436
919 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths)) 1437 if (i + 1 == ARRAY_SIZE(ldpaths))
920 break; 1438 break;
921 } 1439 }
922 ldpaths[i] = NULL; 1440 ldpaths[i] = NULL;
923 1441
924 fclose(fp); 1442 fclose(fp);
1443 return i;
925} 1444}
1445
1446#elif defined(__FreeBSD__) || (__DragonFly__)
1447
1448static int load_ld_cache_config(int i, const char *fname)
1449{
1450 FILE *fp = NULL;
1451 char *b = NULL, *p;
1452 struct elfhints_hdr hdr;
1453
1454 if (i + 1 == ARRAY_SIZE(ldpaths))
1455 return i;
1456
1457 if ((fp = fopen(fname, "r")) == NULL)
1458 return i;
1459
1460 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1461 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1462 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1463 {
1464 fclose(fp);
1465 return i;
1466 }
1467
1468 b = (char*)malloc(hdr.dirlistlen+1);
1469 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1470 fclose(fp);
1471 free(b);
1472 return i;
1473 }
1474
1475 while ((p = strsep(&b, ":"))) {
1476 if (*p == '\0') continue;
1477 ldpaths[i++] = xstrdup(p);
1478
1479 if (i + 1 == ARRAY_SIZE(ldpaths))
1480 break;
1481 }
1482 ldpaths[i] = NULL;
1483
1484 free(b);
1485 fclose(fp);
1486 return i;
1487}
1488
1489#else
1490
1491#warning Cache config support not implemented for your target
1492static int load_ld_cache_config(int i, const char *fname)
1493{
1494 memset(ldpaths, 0x00, sizeof(ldpaths));
1495}
1496
1497#endif
926 1498
927/* scan /etc/ld.so.conf for paths */ 1499/* scan /etc/ld.so.conf for paths */
928static void scanelf_ldpath() 1500static void scanelf_ldpath()
929{ 1501{
930 char scan_l, scan_ul, scan_ull; 1502 char scan_l, scan_ul, scan_ull;
964 } 1536 }
965 1537
966 free(path); 1538 free(path);
967} 1539}
968 1540
969
970
971/* usage / invocation handling functions */ 1541/* usage / invocation handling functions */
972#define PARSE_FLAGS "plRmyxetrnibSs:gN:TaqvF:f:o:BhV" 1542#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:BhV"
973#define a_argument required_argument 1543#define a_argument required_argument
974static struct option const long_opts[] = { 1544static struct option const long_opts[] = {
975 {"path", no_argument, NULL, 'p'}, 1545 {"path", no_argument, NULL, 'p'},
976 {"ldpath", no_argument, NULL, 'l'}, 1546 {"ldpath", no_argument, NULL, 'l'},
977 {"recursive", no_argument, NULL, 'R'}, 1547 {"recursive", no_argument, NULL, 'R'},
978 {"mount", no_argument, NULL, 'm'}, 1548 {"mount", no_argument, NULL, 'm'},
979 {"symlink", no_argument, NULL, 'y'}, 1549 {"symlink", no_argument, NULL, 'y'},
1550 {"archives", no_argument, NULL, 'A'},
1551 {"ldcache", no_argument, NULL, 'L'},
1552 {"fix", no_argument, NULL, 'X'},
1553 {"setpax", a_argument, NULL, 'z'},
980 {"pax", no_argument, NULL, 'x'}, 1554 {"pax", no_argument, NULL, 'x'},
981 {"header", no_argument, NULL, 'e'}, 1555 {"header", no_argument, NULL, 'e'},
982 {"textrel", no_argument, NULL, 't'}, 1556 {"textrel", no_argument, NULL, 't'},
983 {"rpath", no_argument, NULL, 'r'}, 1557 {"rpath", no_argument, NULL, 'r'},
984 {"needed", no_argument, NULL, 'n'}, 1558 {"needed", no_argument, NULL, 'n'},
985 {"interp", no_argument, NULL, 'i'}, 1559 {"interp", no_argument, NULL, 'i'},
986 {"bind", no_argument, NULL, 'b'}, 1560 {"bind", no_argument, NULL, 'b'},
987 {"soname", no_argument, NULL, 'S'}, 1561 {"soname", no_argument, NULL, 'S'},
988 {"symbol", a_argument, NULL, 's'}, 1562 {"symbol", a_argument, NULL, 's'},
1563 {"section", a_argument, NULL, 'k'},
989 {"lib", a_argument, NULL, 'N'}, 1564 {"lib", a_argument, NULL, 'N'},
990 {"gmatch", no_argument, NULL, 'g'}, 1565 {"gmatch", no_argument, NULL, 'g'},
991 {"textrels", no_argument, NULL, 'T'}, 1566 {"textrels", no_argument, NULL, 'T'},
1567 {"etype", a_argument, NULL, 'E'},
1568 {"bits", a_argument, NULL, 'M'},
992 {"all", no_argument, NULL, 'a'}, 1569 {"all", no_argument, NULL, 'a'},
993 {"quiet", no_argument, NULL, 'q'}, 1570 {"quiet", no_argument, NULL, 'q'},
994 {"verbose", no_argument, NULL, 'v'}, 1571 {"verbose", no_argument, NULL, 'v'},
995 {"format", a_argument, NULL, 'F'}, 1572 {"format", a_argument, NULL, 'F'},
996 {"from", a_argument, NULL, 'f'}, 1573 {"from", a_argument, NULL, 'f'},
1004static const char *opts_help[] = { 1581static const char *opts_help[] = {
1005 "Scan all directories in PATH environment", 1582 "Scan all directories in PATH environment",
1006 "Scan all directories in /etc/ld.so.conf", 1583 "Scan all directories in /etc/ld.so.conf",
1007 "Scan directories recursively", 1584 "Scan directories recursively",
1008 "Don't recursively cross mount points", 1585 "Don't recursively cross mount points",
1009 "Don't scan symlinks\n", 1586 "Don't scan symlinks",
1587 "Scan archives (.a files)",
1588 "Utilize ld.so.cache information (use with -r/-n)",
1589 "Try and 'fix' bad things (use with -r/-e)",
1590 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1010 "Print PaX markings", 1591 "Print PaX markings",
1011 "Print GNU_STACK/PT_LOAD markings", 1592 "Print GNU_STACK/PT_LOAD markings",
1012 "Print TEXTREL information", 1593 "Print TEXTREL information",
1013 "Print RPATH information", 1594 "Print RPATH information",
1014 "Print NEEDED information", 1595 "Print NEEDED information",
1015 "Print INTERP information", 1596 "Print INTERP information",
1016 "Print BIND information", 1597 "Print BIND information",
1017 "Print SONAME information", 1598 "Print SONAME information",
1018 "Find a specified symbol", 1599 "Find a specified symbol",
1600 "Find a specified section",
1019 "Find a specified library", 1601 "Find a specified library",
1020 "Use strncmp to match libraries. (use with -N)", 1602 "Use strncmp to match libraries. (use with -N)",
1021 "Locate cause of TEXTREL", 1603 "Locate cause of TEXTREL",
1604 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1605 "Print only ELF files matching numeric bits",
1022 "Print all scanned info (-x -e -t -r -b)\n", 1606 "Print all scanned info (-x -e -t -r -b)\n",
1023 "Only output 'bad' things", 1607 "Only output 'bad' things",
1024 "Be verbose (can be specified more than once)", 1608 "Be verbose (can be specified more than once)",
1025 "Use specified format for output", 1609 "Use specified format for output",
1026 "Read input stream from a filename", 1610 "Read input stream from a filename",
1034/* display usage and exit */ 1618/* display usage and exit */
1035static void usage(int status) 1619static void usage(int status)
1036{ 1620{
1037 unsigned long i; 1621 unsigned long i;
1038 printf("* Scan ELF binaries for stuff\n\n" 1622 printf("* Scan ELF binaries for stuff\n\n"
1039 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0); 1623 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1040 printf("Options: -[%s]\n", PARSE_FLAGS); 1624 printf("Options: -[%s]\n", PARSE_FLAGS);
1041 for (i = 0; long_opts[i].name; ++i) 1625 for (i = 0; long_opts[i].name; ++i)
1042 if (long_opts[i].has_arg == no_argument) 1626 if (long_opts[i].has_arg == no_argument)
1043 printf(" -%c, --%-13s* %s\n", long_opts[i].val, 1627 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
1044 long_opts[i].name, opts_help[i]); 1628 long_opts[i].name, opts_help[i]);
1045 else 1629 else
1046 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val, 1630 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
1047 long_opts[i].name, opts_help[i]); 1631 long_opts[i].name, opts_help[i]);
1048 1632
1049 if (status != EXIT_SUCCESS) 1633 if (status != EXIT_SUCCESS)
1050 exit(status); 1634 exit(status);
1051 1635
1052 puts("\nThe format modifiers for the -F option are:"); 1636 puts("\nThe format modifiers for the -F option are:");
1053 puts(" F Filename \tx PaX Flags \te STACK/RELRO"); 1637 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1054 puts(" t TEXTREL \tr RPATH \tn NEEDED"); 1638 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1055 puts(" i INTERP \tb BIND \ts symbol"); 1639 puts(" i INTERP \tb BIND \ts symbol");
1056 puts(" N library \to Type \tT TEXTRELs"); 1640 puts(" N library \to Type \tT TEXTRELs");
1057 puts(" S SONAME"); 1641 puts(" S SONAME \tk section \ta arch");
1058 puts(" p filename (with search path removed)"); 1642 puts(" p filename (with search path removed)");
1059 puts(" f filename (short name/basename)"); 1643 puts(" f filename (short name/basename)");
1060 puts("Prefix each modifier with '%' (verbose) or '#' (silent)"); 1644 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1061 1645
1646 puts("\nELF Etypes:");
1647 print_etypes(stdout);
1648
1062 exit(status); 1649 exit(status);
1063} 1650}
1064 1651
1065/* parse command line arguments and preform needed actions */ 1652/* parse command line arguments and preform needed actions */
1653#define do_pax_state(option, flag) \
1654 if (islower(option)) { \
1655 flags &= ~PF_##flag; \
1656 flags |= PF_NO##flag; \
1657 } else { \
1658 flags &= ~PF_NO##flag; \
1659 flags |= PF_##flag; \
1660 }
1066static void parseargs(int argc, char *argv[]) 1661static int parseargs(int argc, char *argv[])
1067{ 1662{
1068 int i; 1663 int i;
1069 char *from_file = NULL; 1664 const char *from_file = NULL;
1665 int ret = 0;
1070 1666
1071 opterr = 0; 1667 opterr = 0;
1072 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 1668 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1073 switch (i) { 1669 switch (i) {
1074 1670
1078 VERSION, __FILE__, __DATE__, rcsid, argv0); 1674 VERSION, __FILE__, __DATE__, rcsid, argv0);
1079 exit(EXIT_SUCCESS); 1675 exit(EXIT_SUCCESS);
1080 break; 1676 break;
1081 case 'h': usage(EXIT_SUCCESS); break; 1677 case 'h': usage(EXIT_SUCCESS); break;
1082 case 'f': 1678 case 'f':
1083 if (from_file) err("Don't specify -f twice"); 1679 if (from_file) warn("You prob don't want to specify -f twice");
1084 from_file = xstrdup(optarg); 1680 from_file = optarg;
1681 break;
1682 case 'E':
1683 strncpy(match_etypes, optarg, sizeof(match_etypes));
1684 break;
1685 case 'M':
1686 match_bits = atoi(optarg);
1085 break; 1687 break;
1086 case 'o': { 1688 case 'o': {
1087 FILE *fp = NULL;
1088 if ((fp = freopen(optarg, "w", stdout)) == NULL) 1689 if (freopen(optarg, "w", stdout) == NULL)
1089 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 1690 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1090 SET_STDOUT(fp);
1091 break; 1691 break;
1092 } 1692 }
1093 1693 case 'k':
1694 if (find_section) warn("You prob don't want to specify -k twice");
1695 find_section = optarg;
1696 break;
1094 case 's': { 1697 case 's': {
1095 size_t len;
1096 if (find_sym) err("Don't specify -s twice"); 1698 if (find_sym) warn("You prob don't want to specify -s twice");
1097 find_sym = xstrdup(optarg); 1699 find_sym = optarg;
1098 len = strlen(find_sym) + 1;
1099 versioned_symname = (char*)xmalloc(sizeof(char) * (len+1)); 1700 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1100 sprintf(versioned_symname, "%s@", find_sym); 1701 sprintf(versioned_symname, "%s@", find_sym);
1101 break; 1702 break;
1102 } 1703 }
1103 case 'N': { 1704 case 'N': {
1104 if (find_lib) err("Don't specify -N twice"); 1705 if (find_lib) warn("You prob don't want to specify -N twice");
1105 find_lib = xstrdup(optarg); 1706 find_lib = optarg;
1106 break; 1707 break;
1107 } 1708 }
1108 1709
1109 case 'F': { 1710 case 'F': {
1110 if (out_format) err("Don't specify -F twice"); 1711 if (out_format) warn("You prob don't want to specify -F twice");
1111 out_format = xstrdup(optarg); 1712 out_format = optarg;
1112 break; 1713 break;
1113 } 1714 }
1715 case 'z': {
1716 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1717 size_t x;
1114 1718
1719 for (x = 0 ; x < strlen(optarg); x++) {
1720 switch(optarg[x]) {
1721 case 'p':
1722 case 'P':
1723 do_pax_state(optarg[x], PAGEEXEC);
1724 break;
1725 case 's':
1726 case 'S':
1727 do_pax_state(optarg[x], SEGMEXEC);
1728 break;
1729 case 'm':
1730 case 'M':
1731 do_pax_state(optarg[x], MPROTECT);
1732 break;
1733 case 'e':
1734 case 'E':
1735 do_pax_state(optarg[x], EMUTRAMP);
1736 break;
1737 case 'r':
1738 case 'R':
1739 do_pax_state(optarg[x], RANDMMAP);
1740 break;
1741 case 'x':
1742 case 'X':
1743 do_pax_state(optarg[x], RANDEXEC);
1744 break;
1745 default:
1746 break;
1747 }
1748 }
1749 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
1750 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
1751 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
1752 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
1753 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1754 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1755 setpax = flags;
1756 break;
1757 }
1115 case 'g': gmatch = 1; 1758 case 'g': gmatch = 1; break;
1759 case 'L': use_ldcache = 1; break;
1116 case 'y': scan_symlink = 0; break; 1760 case 'y': scan_symlink = 0; break;
1761 case 'A': scan_archives = 1; break;
1117 case 'B': show_banner = 0; break; 1762 case 'B': show_banner = 0; break;
1118 case 'l': scan_ldpath = 1; break; 1763 case 'l': scan_ldpath = 1; break;
1119 case 'p': scan_envpath = 1; break; 1764 case 'p': scan_envpath = 1; break;
1120 case 'R': dir_recurse = 1; break; 1765 case 'R': dir_recurse = 1; break;
1121 case 'm': dir_crossmount = 0; break; 1766 case 'm': dir_crossmount = 0; break;
1767 case 'X': ++fix_elf; break;
1122 case 'x': show_pax = 1; break; 1768 case 'x': show_pax = 1; break;
1123 case 'e': show_phdr = 1; break; 1769 case 'e': show_phdr = 1; break;
1124 case 't': show_textrel = 1; break; 1770 case 't': show_textrel = 1; break;
1125 case 'r': show_rpath = 1; break; 1771 case 'r': show_rpath = 1; break;
1126 case 'n': show_needed = 1; break; 1772 case 'n': show_needed = 1; break;
1131 case 'q': be_quiet = 1; break; 1777 case 'q': be_quiet = 1; break;
1132 case 'v': be_verbose = (be_verbose % 20) + 1; break; 1778 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1133 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break; 1779 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
1134 1780
1135 case ':': 1781 case ':':
1136 err("Option missing parameter\n"); 1782 err("Option '%c' is missing parameter", optopt);
1137 case '?': 1783 case '?':
1138 err("Unknown option\n"); 1784 err("Unknown option '%c' or argument missing", optopt);
1139 default: 1785 default:
1140 err("Unhandled option '%c'", i); 1786 err("Unhandled option '%c'; please report this", i);
1141 }
1142 } 1787 }
1143 1788 }
1789 if (show_textrels && be_verbose) {
1790 if (which("objdump") != NULL)
1791 has_objdump = 1;
1792 }
1144 /* let the format option override all other options */ 1793 /* let the format option override all other options */
1145 if (out_format) { 1794 if (out_format) {
1146 show_pax = show_phdr = show_textrel = show_rpath = \ 1795 show_pax = show_phdr = show_textrel = show_rpath = \
1147 show_needed = show_interp = show_bind = show_soname = \ 1796 show_needed = show_interp = show_bind = show_soname = \
1148 show_textrels = 0; 1797 show_textrels = 0;
1149 for (i = 0; out_format[i]; ++i) { 1798 for (i = 0; out_format[i]; ++i) {
1150 if (!IS_MODIFIER(out_format[i])) continue; 1799 if (!IS_MODIFIER(out_format[i])) continue;
1151 1800
1152 switch (out_format[++i]) { 1801 switch (out_format[++i]) {
1802 case '+': break;
1153 case '%': break; 1803 case '%': break;
1154 case '#': break; 1804 case '#': break;
1155 case 'F': break; 1805 case 'F': break;
1156 case 'p': break; 1806 case 'p': break;
1157 case 'f': break; 1807 case 'f': break;
1808 case 'k': break;
1158 case 's': break; 1809 case 's': break;
1159 case 'N': break; 1810 case 'N': break;
1160 case 'o': break; 1811 case 'o': break;
1812 case 'a': break;
1813 case 'M': break;
1161 case 'x': show_pax = 1; break; 1814 case 'x': show_pax = 1; break;
1162 case 'e': show_phdr = 1; break; 1815 case 'e': show_phdr = 1; break;
1163 case 't': show_textrel = 1; break; 1816 case 't': show_textrel = 1; break;
1164 case 'r': show_rpath = 1; break; 1817 case 'r': show_rpath = 1; break;
1165 case 'n': show_needed = 1; break; 1818 case 'n': show_needed = 1; break;
1166 case 'i': show_interp = 1; break; 1819 case 'i': show_interp = 1; break;
1167 case 'b': show_bind = 1; break; 1820 case 'b': show_bind = 1; break;
1168 case 'S': show_soname = 1; break; 1821 case 'S': show_soname = 1; break;
1169 case 'T': show_textrels = 1; break; 1822 case 'T': show_textrels = 1; break;
1170 default: 1823 default:
1171 err("Invalid format specifier '%c' (byte %i)", 1824 err("Invalid format specifier '%c' (byte %i)",
1172 out_format[i], i+1); 1825 out_format[i], i+1);
1173 } 1826 }
1174 } 1827 }
1175 1828
1176 /* construct our default format */ 1829 /* construct our default format */
1186 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 1839 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1187 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len); 1840 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1188 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len); 1841 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1189 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len); 1842 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1190 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len); 1843 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1844 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1191 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len); 1845 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1192 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 1846 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1193 } 1847 }
1194 if (be_verbose > 2) printf("Format: %s\n", out_format); 1848 if (be_verbose > 2) printf("Format: %s\n", out_format);
1195 1849
1196 /* now lets actually do the scanning */ 1850 /* now lets actually do the scanning */
1197 if (scan_ldpath || (show_rpath && be_quiet)) 1851 if (scan_ldpath || use_ldcache)
1198 load_ld_so_conf(); 1852 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
1199 if (scan_ldpath) scanelf_ldpath(); 1853 if (scan_ldpath) scanelf_ldpath();
1200 if (scan_envpath) scanelf_envpath(); 1854 if (scan_envpath) scanelf_envpath();
1855 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
1856 from_file = "-";
1201 if (from_file) { 1857 if (from_file) {
1202 scanelf_from_file(from_file); 1858 scanelf_from_file(from_file);
1203 free(from_file);
1204 from_file = *argv; 1859 from_file = *argv;
1205 } 1860 }
1206 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file) 1861 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1207 err("Nothing to scan !?"); 1862 err("Nothing to scan !?");
1208 while (optind < argc) { 1863 while (optind < argc) {
1209 search_path = argv[optind++]; 1864 search_path = argv[optind++];
1210 scanelf_dir(search_path); 1865 ret = scanelf_dir(search_path);
1211 } 1866 }
1212 1867
1213 /* clean up */ 1868 /* clean up */
1214 if (find_sym) {
1215 free(find_sym);
1216 free(versioned_symname); 1869 free(versioned_symname);
1217 }
1218 if (find_lib) free(find_lib);
1219 if (out_format) free(out_format);
1220 for (i = 0; ldpaths[i]; ++i) 1870 for (i = 0; ldpaths[i]; ++i)
1221 free(ldpaths[i]); 1871 free(ldpaths[i]);
1872
1873 if (ldcache != 0)
1874 munmap(ldcache, ldcache_size);
1875 return ret;
1876}
1877
1878static char **get_split_env(const char *envvar)
1879{
1880 const char *delims = " \t\n";
1881 char **envvals = NULL;
1882 char *env, *s;
1883 int nentry;
1884
1885 if ((env = getenv(envvar)) == NULL)
1886 return NULL;
1887
1888 env = xstrdup(env);
1889 if (env == NULL)
1890 return NULL;
1891
1892 s = strtok(env, delims);
1893 if (s == NULL) {
1894 free(env);
1895 return NULL;
1896 }
1897
1898 nentry = 0;
1899 while (s != NULL) {
1900 ++nentry;
1901 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
1902 envvals[nentry-1] = s;
1903 s = strtok(NULL, delims);
1904 }
1905 envvals[nentry] = NULL;
1906
1907 /* don't want to free(env) as it contains the memory that backs
1908 * the envvals array of strings */
1909 return envvals;
1910}
1911static void parseenv()
1912{
1913 qa_textrels = get_split_env("QA_TEXTRELS");
1914 qa_execstack = get_split_env("QA_EXECSTACK");
1915 qa_wx_load = get_split_env("QA_WX_LOAD");
1916}
1917
1918#ifdef __PAX_UTILS_CLEANUP
1919static void cleanup()
1920{
1921 free(out_format);
1922 free(qa_textrels);
1923 free(qa_execstack);
1924 free(qa_wx_load);
1925}
1926#endif
1927
1928
1929int main(int argc, char *argv[])
1930{
1931 int ret;
1932 if (argc < 2)
1933 usage(EXIT_FAILURE);
1934 parseenv();
1935 ret = parseargs(argc, argv);
1936 fclose(stdout);
1937#ifdef __PAX_UTILS_CLEANUP
1938 cleanup();
1939 warn("The calls to add/delete heap should be off:\n"
1940 "\t- 1 due to the out_buffer not being freed in scanelf_file()\n"
1941 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
1942#endif
1943 return ret;
1222} 1944}
1223 1945
1224 1946
1225 1947
1226/* utility funcs */ 1948/* utility funcs */
1228{ 1950{
1229 char *ret = strdup(s); 1951 char *ret = strdup(s);
1230 if (!ret) err("Could not strdup(): %s", strerror(errno)); 1952 if (!ret) err("Could not strdup(): %s", strerror(errno));
1231 return ret; 1953 return ret;
1232} 1954}
1233
1234static void *xmalloc(size_t size) 1955static void *xmalloc(size_t size)
1235{ 1956{
1236 void *ret = malloc(size); 1957 void *ret = malloc(size);
1237 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size); 1958 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1238 return ret; 1959 return ret;
1239} 1960}
1240 1961static void *xrealloc(void *ptr, size_t size)
1962{
1963 void *ret = realloc(ptr, size);
1964 if (!ret) err("Could not realloc() %li bytes", (unsigned long)size);
1965 return ret;
1966}
1241static void xstrcat(char **dst, const char *src, size_t *curr_len) 1967static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
1242{ 1968{
1243 size_t new_len; 1969 size_t new_len;
1244 1970
1245 new_len = strlen(*dst) + strlen(src); 1971 new_len = strlen(*dst) + strlen(src);
1246 if (*curr_len <= new_len) { 1972 if (*curr_len <= new_len) {
1247 *curr_len = new_len + (*curr_len / 2); 1973 *curr_len = new_len + (*curr_len / 2);
1248 *dst = realloc(*dst, *curr_len); 1974 *dst = realloc(*dst, *curr_len);
1249 if (!*dst) 1975 if (!*dst)
1250 err("could not realloc %li bytes", (unsigned long)*curr_len); 1976 err("could not realloc() %li bytes", (unsigned long)*curr_len);
1251 } 1977 }
1252 1978
1979 if (n)
1980 strncat(*dst, src, n);
1981 else
1253 strcat(*dst, src); 1982 strcat(*dst, src);
1254} 1983}
1255
1256static inline void xchrcat(char **dst, const char append, size_t *curr_len) 1984static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1257{ 1985{
1258 static char my_app[2]; 1986 static char my_app[2];
1259 my_app[0] = append; 1987 my_app[0] = append;
1260 my_app[1] = '\0'; 1988 my_app[1] = '\0';
1261 xstrcat(dst, my_app, curr_len); 1989 xstrcat(dst, my_app, curr_len);
1262} 1990}
1263 1991
1264 1992/* Match filename against entries in matchlist, return TRUE
1265 1993 * if the file is listed */
1266int main(int argc, char *argv[]) 1994static int file_matches_list(const char *filename, char **matchlist)
1267{ 1995{
1268 if (argc < 2) 1996 char **file;
1269 usage(EXIT_FAILURE); 1997 char *match;
1270 parseargs(argc, argv); 1998 char buf[__PAX_UTILS_PATH_MAX];
1271 fclose(stdout); 1999
1272#ifdef __BOUNDS_CHECKING_ON 2000 if (matchlist == NULL)
1273 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()"); 2001 return 0;
1274#endif 2002
1275 return EXIT_SUCCESS; 2003 for (file = matchlist; *file != NULL; file++) {
2004 if (search_path) {
2005 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2006 match = buf;
2007 } else {
2008 match = *file;
2009 }
2010 if (fnmatch(match, filename, 0) == 0)
2011 return 1;
2012 }
2013 return 0;
1276} 2014}

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