/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.88 Revision 1.172
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 1.172 2007/01/09 23:04:12 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 1.172 2007/01/09 23:04:12 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 path = getenv("PATH");
86 if (!path)
87 return NULL;
88
89 path = xstrdup(path);
90 while ((p = strrchr(path, ':')) != NULL) {
91 snprintf(fullpath, sizeof(fullpath), "%s/%s", p + 1, fname);
92 *p = 0;
93 if (access(fullpath, R_OK) != (-1)) {
94 free(path);
95 return (char *) fullpath;
96 }
97 }
98 free(path);
99 return NULL;
100}
70 101
71/* sub-funcs for scanelf_file() */ 102/* sub-funcs for scanelf_file() */
72static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab) 103static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
73{ 104{
74 /* find the best SHT_DYNSYM and SHT_STRTAB sections */ 105 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
93 } \ 124 } \
94 } 125 }
95 GET_SYMTABS(32) 126 GET_SYMTABS(32)
96 GET_SYMTABS(64) 127 GET_SYMTABS(64)
97} 128}
129
98static char *scanelf_file_pax(elfobj *elf, char *found_pax) 130static char *scanelf_file_pax(elfobj *elf, char *found_pax)
99{ 131{
100 static char *paxflags;
101 static char ret[7]; 132 static char ret[7];
102 unsigned long i, shown; 133 unsigned long i, shown;
103 134
104 if (!show_pax) return NULL; 135 if (!show_pax) return NULL;
105 136
112 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 143 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
113 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 144 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
114 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 145 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
115 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \ 146 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
116 continue; \ 147 continue; \
117 if (be_quiet && (EGET(phdr[i].p_flags) == 10240)) \ 148 if (fix_elf && setpax) { \
149 /* set the paxctl flags */ \
150 ESET(phdr[i].p_flags, setpax); \
151 } \
152 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
118 continue; \ 153 continue; \
119 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \ 154 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
120 *found_pax = 1; \ 155 *found_pax = 1; \
121 ++shown; \ 156 ++shown; \
122 break; \ 157 break; \
124 } 159 }
125 SHOW_PAX(32) 160 SHOW_PAX(32)
126 SHOW_PAX(64) 161 SHOW_PAX(64)
127 } 162 }
128 163
164
165 if (fix_elf && setpax) {
166 /* set the chpax settings */
167 if (elf->elf_class == ELFCLASS32) {
168 if (EHDR32(elf->ehdr)->e_type == ET_DYN || EHDR32(elf->ehdr)->e_type == ET_EXEC)
169 ESET(EHDR32(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
170 } else {
171 if (EHDR64(elf->ehdr)->e_type == ET_DYN || EHDR64(elf->ehdr)->e_type == ET_EXEC)
172 ESET(EHDR64(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
173 }
174 }
175
129 /* fall back to EI_PAX if no PT_PAX was found */ 176 /* fall back to EI_PAX if no PT_PAX was found */
130 if (!*ret) { 177 if (!*ret) {
178 static char *paxflags;
131 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf)); 179 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
132 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) { 180 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
133 *found_pax = 1; 181 *found_pax = 1;
134 return paxflags; 182 return (be_wewy_wewy_quiet ? NULL : paxflags);
135 } 183 }
136 strncpy(ret, paxflags, sizeof(ret)); 184 strncpy(ret, paxflags, sizeof(ret));
137 } 185 }
138 186
139 if (be_quiet && !shown) 187 if (be_wewy_wewy_quiet || (be_quiet && !shown))
140 return NULL; 188 return NULL;
189 else
141 return ret; 190 return ret;
142
143} 191}
192
144static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load) 193static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
145{ 194{
146 static char ret[12]; 195 static char ret[12];
147 char *found; 196 char *found;
148 unsigned long i, off, shown, check_flags;
149 unsigned char multi_stack, multi_relro, multi_load; 197 unsigned long i, shown, multi_stack, multi_relro, multi_load;
198 int max_pt_load;
150 199
151 if (!show_phdr) return NULL; 200 if (!show_phdr) return NULL;
152 201
153 memcpy(ret, "--- --- ---\0", 12); 202 memcpy(ret, "--- --- ---\0", 12);
154 203
155 shown = 0; 204 shown = 0;
156 multi_stack = multi_relro = multi_load = 0; 205 multi_stack = multi_relro = multi_load = 0;
206 max_pt_load = elf_max_pt_load(elf);
157 207
158 if (elf->phdr) { 208#define NOTE_GNU_STACK ".note.GNU-stack"
159#define SHOW_PHDR(B) \ 209#define SHOW_PHDR(B) \
160 if (elf->elf_class == ELFCLASS ## B) { \ 210 if (elf->elf_class == ELFCLASS ## B) { \
161 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 211 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
212 Elf ## B ## _Off offset; \
213 uint32_t flags, check_flags; \
214 if (elf->phdr != NULL) { \
162 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 215 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
163 uint32_t flags; \
164 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 216 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
165 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \ 217 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
218 if (multi_stack++) \
166 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \ 219 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
220 if (file_matches_list(elf->filename, qa_execstack)) \
221 continue; \
167 found = found_phdr; \ 222 found = found_phdr; \
168 off = 0; \ 223 offset = 0; \
169 check_flags = PF_X; \ 224 check_flags = PF_X; \
170 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \ 225 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
226 if (multi_relro++) \
171 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \ 227 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
172 found = found_relro; \ 228 found = found_relro; \
173 off = 4; \ 229 offset = 4; \
174 check_flags = PF_X; \ 230 check_flags = PF_X; \
175 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \ 231 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
176 if (multi_load++ > 2) warnf("%s: more than 2 PT_LOAD's !?", elf->filename); \ 232 if (ehdr->e_type == ET_DYN || ehdr->e_type == ET_EXEC) \
233 if (multi_load++ > max_pt_load) \
234 warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
235 if (file_matches_list(elf->filename, qa_wx_load)) \
236 continue; \
177 found = found_load; \ 237 found = found_load; \
178 off = 8; \ 238 offset = 8; \
179 check_flags = PF_W|PF_X; \ 239 check_flags = PF_W|PF_X; \
180 } else \ 240 } else \
181 continue; \ 241 continue; \
182 flags = EGET(phdr[i].p_flags); \ 242 flags = EGET(phdr[i].p_flags); \
183 if (be_quiet && ((flags & check_flags) != check_flags)) \ 243 if (be_quiet && ((flags & check_flags) != check_flags)) \
184 continue; \ 244 continue; \
245 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
246 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
247 ret[3] = ret[7] = '!'; \
248 flags = EGET(phdr[i].p_flags); \
249 } \
185 memcpy(ret+off, gnu_short_stack_flags(flags), 3); \ 250 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
186 *found = 1; \ 251 *found = 1; \
187 ++shown; \ 252 ++shown; \
253 } \
254 } else if (elf->shdr != NULL) { \
255 /* no program headers which means this is prob an object file */ \
256 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
257 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
258 char *str; \
259 if ((void*)strtbl > (void*)elf->data_end) \
260 goto skip_this_shdr##B; \
261 check_flags = SHF_WRITE|SHF_EXECINSTR; \
262 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
263 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
264 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
265 str = elf->data + offset; \
266 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
267 if (!strcmp(str, NOTE_GNU_STACK)) { \
268 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
269 flags = EGET(shdr[i].sh_flags); \
270 if (be_quiet && ((flags & check_flags) != check_flags)) \
271 continue; \
272 ++*found_phdr; \
273 shown = 1; \
274 if (flags & SHF_WRITE) ret[0] = 'W'; \
275 if (flags & SHF_ALLOC) ret[1] = 'A'; \
276 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
277 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
278 break; \
279 } \
280 } \
281 skip_this_shdr##B: \
282 if (!multi_stack) { \
283 if (file_matches_list(elf->filename, qa_execstack)) \
284 return NULL; \
285 *found_phdr = 1; \
286 shown = 1; \
287 memcpy(ret, "!WX", 3); \
288 } \
188 } \ 289 } \
189 } 290 }
190 SHOW_PHDR(32) 291 SHOW_PHDR(32)
191 SHOW_PHDR(64) 292 SHOW_PHDR(64)
192 }
193 293
194 if (be_quiet && !shown) 294 if (be_wewy_wewy_quiet || (be_quiet && !shown))
195 return NULL; 295 return NULL;
196 else 296 else
197 return ret; 297 return ret;
198} 298}
299
199static char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 300static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
200{ 301{
201 static char ret[] = "TEXTREL"; 302 static const char *ret = "TEXTREL";
202 unsigned long i; 303 unsigned long i;
203 304
204 if (!show_textrel && !show_textrels) return NULL; 305 if (!show_textrel && !show_textrels) return NULL;
306
307 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
205 308
206 if (elf->phdr) { 309 if (elf->phdr) {
207#define SHOW_TEXTREL(B) \ 310#define SHOW_TEXTREL(B) \
208 if (elf->elf_class == ELFCLASS ## B) { \ 311 if (elf->elf_class == ELFCLASS ## B) { \
209 Elf ## B ## _Dyn *dyn; \ 312 Elf ## B ## _Dyn *dyn; \
229 } 332 }
230 333
231 if (be_quiet || be_wewy_wewy_quiet) 334 if (be_quiet || be_wewy_wewy_quiet)
232 return NULL; 335 return NULL;
233 else 336 else
234 return (char *)" - "; 337 return " - ";
235} 338}
236static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel) 339static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
237{ 340{
238 unsigned long s, r, rmax; 341 unsigned long s, r, rmax;
239 void *symtab_void, *strtab_void, *text_void; 342 void *symtab_void, *strtab_void, *text_void;
292 if (be_verbose <= 2) continue; \ 395 if (be_verbose <= 2) continue; \
293 } else \ 396 } else \
294 *found_textrels = 1; \ 397 *found_textrels = 1; \
295 /* locate this relocation symbol name */ \ 398 /* locate this relocation symbol name */ \
296 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 399 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
400 if ((void*)sym > (void*)elf->data_end) { \
401 warn("%s: corrupt ELF symbol", elf->filename); \
402 continue; \
403 } \
297 sym_max = ELF ## B ## _R_SYM(r_info); \ 404 sym_max = ELF ## B ## _R_SYM(r_info); \
298 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \ 405 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
299 sym += sym_max; \ 406 sym += sym_max; \
300 else \ 407 else \
301 sym = NULL; \ 408 sym = NULL; \
303 /* show the raw details about this reloc */ \ 410 /* show the raw details about this reloc */ \
304 printf(" %s: ", elf->base_filename); \ 411 printf(" %s: ", elf->base_filename); \
305 if (sym && sym->st_name) \ 412 if (sym && sym->st_name) \
306 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \ 413 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \
307 else \ 414 else \
308 printf("(memory/fake?)"); \ 415 printf("(memory/data?)"); \
309 printf(" [0x%lX]", (unsigned long)r_offset); \ 416 printf(" [0x%lX]", (unsigned long)r_offset); \
310 /* now try to find the closest symbol that this rel is probably in */ \ 417 /* now try to find the closest symbol that this rel is probably in */ \
311 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 418 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
312 func = NULL; \ 419 func = NULL; \
313 offset_tmp = 0; \ 420 offset_tmp = 0; \
317 offset_tmp = EGET(sym->st_value); \ 424 offset_tmp = EGET(sym->st_value); \
318 } \ 425 } \
319 ++sym; \ 426 ++sym; \
320 } \ 427 } \
321 printf(" in "); \ 428 printf(" in "); \
322 if (func && func->st_name) \ 429 if (func && func->st_name) { \
323 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \ 430 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
431 if (r_offset > EGET(func->st_size)) \
432 printf("(optimized out: previous %s)", func_name); \
324 else \ 433 else \
325 printf("(NULL: fake?)"); \ 434 printf("%s", func_name); \
435 } else \
436 printf("(optimized out)"); \
326 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \ 437 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
438 if (be_verbose && has_objdump) { \
439 char *sysbuf; \
440 size_t syslen; \
441 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"; \
442 syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
443 sysbuf = xmalloc(syslen); \
444 if (sysbuf) { \
445 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
446 if (end_addr < r_offset) \
447 /* not uncommon when things are optimized out */ \
448 end_addr = r_offset + 0x100; \
449 snprintf(sysbuf, syslen, sysfmt, \
450 (unsigned long)offset_tmp, \
451 (unsigned long)end_addr, \
452 elf->filename, \
453 (unsigned long)r_offset); \
454 fflush(stdout); \
455 system(sysbuf); \
456 fflush(stdout); \
457 free(sysbuf); \
458 } \
459 } \
327 } \ 460 } \
328 } } 461 } }
329 SHOW_TEXTRELS(32) 462 SHOW_TEXTRELS(32)
330 SHOW_TEXTRELS(64) 463 SHOW_TEXTRELS(64)
331 } 464 }
333 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename); 466 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
334 467
335 return NULL; 468 return NULL;
336} 469}
337 470
338static void rpath_security_checks(elfobj *, char *); 471static void rpath_security_checks(elfobj *, char *, const char *);
339static void rpath_security_checks(elfobj *elf, char *item) { 472static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
473{
340 struct stat st; 474 struct stat st;
341 switch (*item) { 475 switch (*item) {
476 case '/': break;
342 case 0: 477 case '.':
343 warnf("Security problem NULL RPATH in %s", elf->filename); 478 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
344 break; 479 break;
345 case '/': break; 480 case ':':
481 case '\0':
482 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
483 break;
346 case '$': 484 case '$':
347 if (fstat(elf->fd, &st) != -1) 485 if (fstat(elf->fd, &st) != -1)
348 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID)) 486 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", 487 warnf("Security problem with %s='%s' in %s with mode set of %o",
350 item, elf->filename, st.st_mode & 07777); 488 dt_type, item, elf->filename, st.st_mode & 07777);
351 break; 489 break;
352 default: 490 default:
353 warnf("Maybe? sec problem with RPATH='%s' in %s", item, elf->filename); 491 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
354 break; 492 break;
355 } 493 }
356} 494}
357static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len) 495static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
358{ 496{
394 /* Verify the memory is somewhat sane */ \ 532 /* Verify the memory is somewhat sane */ \
395 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 533 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
396 if (offset < (Elf ## B ## _Off)elf->len) { \ 534 if (offset < (Elf ## B ## _Off)elf->len) { \
397 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \ 535 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
398 *r = (char*)(elf->data + offset); \ 536 *r = (char*)(elf->data + offset); \
537 /* cache the length in case we need to nuke this section later on */ \
538 if (fix_elf) \
539 offset = strlen(*r); \
399 /* If quiet, don't output paths in ld.so.conf */ \ 540 /* If quiet, don't output paths in ld.so.conf */ \
400 if (be_quiet) { \ 541 if (be_quiet) { \
401 size_t len; \ 542 size_t len; \
402 char *start, *end; \ 543 char *start, *end; \
403 /* note that we only 'chop' off leading known paths. */ \ 544 /* note that we only 'chop' off leading known paths. */ \
404 /* since *r is read-only memory, we can only move the ptr forward. */ \ 545 /* since *r is read-only memory, we can only move the ptr forward. */ \
405 start = *r; \ 546 start = *r; \
406 /* scan each path in : delimited list */ \ 547 /* scan each path in : delimited list */ \
407 while (start) { \ 548 while (start) { \
408 rpath_security_checks(elf, start); \ 549 rpath_security_checks(elf, start, get_elfdtype(word)); \
409 end = strchr(start, ':'); \ 550 end = strchr(start, ':'); \
410 len = (end ? abs(end - start) : strlen(start)); \ 551 len = (end ? abs(end - start) : strlen(start)); \
552 if (use_ldcache) \
411 for (s = 0; ldpaths[s]; ++s) { \ 553 for (s = 0; ldpaths[s]; ++s) \
412 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \ 554 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
413 *r = (end ? end + 1 : NULL); \ 555 *r = end; \
556 /* corner case ... if RPATH reads "/usr/lib:", we want \
557 * to show ':' rather than '' */ \
558 if (end && end[1] != '\0') \
559 (*r)++; \
414 break; \ 560 break; \
415 } \ 561 } \
416 } \
417 if (!*r || !ldpaths[s] || !end) \ 562 if (!*r || !end) \
418 start = NULL; \ 563 break; \
419 else \ 564 else \
420 start = start + len + 1; \ 565 start = start + len + 1; \
421 } \ 566 } \
422 } \ 567 } \
568 if (*r) { \
569 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
570 /* just nuke it */ \
571 nuke_it##B: \
572 memset(*r, 0x00, offset); \
573 *r = NULL; \
574 ESET(dyn->d_tag, DT_DEBUG); \
575 ESET(dyn->d_un.d_ptr, 0); \
576 } else if (fix_elf) { \
577 /* try to clean "bad" paths */ \
578 size_t len, tmpdir_len; \
579 char *start, *end; \
580 const char *tmpdir; \
581 start = *r; \
582 tmpdir = (getenv("TMPDIR") ? : "."); \
583 tmpdir_len = strlen(tmpdir); \
584 while (1) { \
585 end = strchr(start, ':'); \
586 if (start == end) { \
587 eat_this_path##B: \
588 len = strlen(end); \
589 memmove(start, end+1, len); \
590 start[len-1] = '\0'; \
591 end = start - 1; \
592 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
593 if (!end) { \
594 if (start == *r) \
595 goto nuke_it##B; \
596 *--start = '\0'; \
597 } else \
598 goto eat_this_path##B; \
599 } \
600 if (!end) \
601 break; \
602 start = end + 1; \
603 } \
604 if (**r == '\0') \
605 goto nuke_it##B; \
606 } \
607 if (*r) \
423 if (*r) *found_rpath = 1; \ 608 *found_rpath = 1; \
609 } \
424 } \ 610 } \
425 ++dyn; \ 611 ++dyn; \
426 } \ 612 } \
427 } } 613 } }
428 SHOW_RPATH(32) 614 SHOW_RPATH(32)
445 } else if (rpath || runpath) 631 } else if (rpath || runpath)
446 xstrcat(ret, (runpath ? runpath : rpath), ret_len); 632 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
447 else if (!be_quiet) 633 else if (!be_quiet)
448 xstrcat(ret, " - ", ret_len); 634 xstrcat(ret, " - ", ret_len);
449} 635}
636
637#define LDSO_CACHE_MAGIC "ld.so-"
638#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
639#define LDSO_CACHE_VER "1.7.0"
640#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
641#define FLAG_ANY -1
642#define FLAG_TYPE_MASK 0x00ff
643#define FLAG_LIBC4 0x0000
644#define FLAG_ELF 0x0001
645#define FLAG_ELF_LIBC5 0x0002
646#define FLAG_ELF_LIBC6 0x0003
647#define FLAG_REQUIRED_MASK 0xff00
648#define FLAG_SPARC_LIB64 0x0100
649#define FLAG_IA64_LIB64 0x0200
650#define FLAG_X8664_LIB64 0x0300
651#define FLAG_S390_LIB64 0x0400
652#define FLAG_POWERPC_LIB64 0x0500
653#define FLAG_MIPS64_LIBN32 0x0600
654#define FLAG_MIPS64_LIBN64 0x0700
655
656static char *lookup_cache_lib(elfobj *, char *);
657
658#if defined(__GLIBC__) || defined(__UCLIBC__)
659
660static char *lookup_cache_lib(elfobj *elf, char *fname)
661{
662 int fd = 0;
663 char *strs;
664 static char buf[__PAX_UTILS_PATH_MAX] = "";
665 const char *cachefile = "/etc/ld.so.cache";
666 struct stat st;
667
668 typedef struct {
669 char magic[LDSO_CACHE_MAGIC_LEN];
670 char version[LDSO_CACHE_VER_LEN];
671 int nlibs;
672 } header_t;
673 header_t *header;
674
675 typedef struct {
676 int flags;
677 int sooffset;
678 int liboffset;
679 } libentry_t;
680 libentry_t *libent;
681
682 if (fname == NULL)
683 return NULL;
684
685 if (ldcache == 0) {
686 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1)
687 return NULL;
688
689 /* cache these values so we only map/unmap the cache file once */
690 ldcache_size = st.st_size;
691 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
692
693 close(fd);
694
695 if (ldcache == (caddr_t)-1) {
696 ldcache = 0;
697 return NULL;
698 }
699
700 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
701 return NULL;
702 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
703 return NULL;
704 }
705
706 header = (header_t *) ldcache;
707 libent = (libentry_t *) (ldcache + sizeof(header_t));
708 strs = (char *) &libent[header->nlibs];
709
710 for (fd = 0; fd < header->nlibs; fd++) {
711 /* this should be more fine grained, but for now we assume that
712 * diff arches will not be cached together. and we ignore the
713 * the different multilib mips cases. */
714 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
715 continue;
716 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
717 continue;
718
719 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
720 continue;
721 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
722 }
723 return buf;
724}
725#elif defined(__NetBSD__)
726static char *lookup_cache_lib(elfobj *elf, char *fname)
727{
728 static char buf[__PAX_UTILS_PATH_MAX] = "";
729 static struct stat st;
730
731 char **ldpath;
732 for (ldpath = ldpaths; *ldpath != NULL; ldpath++) {
733 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", *ldpath, fname) >= sizeof(buf))
734 continue; /* if the pathname is too long, or something went wrong, ignore */
735
736 if (stat(buf, &st) != 0)
737 continue; /* if the lib doesn't exist in *ldpath, look further */
738
739 /* NetBSD doesn't actually do sanity checks, it just loads the file
740 * and if that doesn't work, continues looking in other directories.
741 * This cannot easily be safely emulated, unfortunately. For now,
742 * just assume that if it exists, it's a valid library. */
743
744 return buf;
745 }
746
747 /* not found in any path */
748 return NULL;
749}
750#else
751#warning Cache support not implemented for your target
752static char *lookup_cache_lib(elfobj *elf, char *fname)
753{
754 return NULL;
755}
756#endif
757
450static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len) 758static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
451{ 759{
452 unsigned long i; 760 unsigned long i;
453 char *needed; 761 char *needed;
454 void *strtbl_void; 762 void *strtbl_void;
763 char *p;
455 764
456 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL; 765 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
457 766
458 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 767 strtbl_void = elf_findsecbyname(elf, ".dynstr");
459 768
479 } \ 788 } \
480 needed = (char*)(elf->data + offset); \ 789 needed = (char*)(elf->data + offset); \
481 if (op == 0) { \ 790 if (op == 0) { \
482 if (!be_wewy_wewy_quiet) { \ 791 if (!be_wewy_wewy_quiet) { \
483 if (*found_needed) xchrcat(ret, ',', ret_len); \ 792 if (*found_needed) xchrcat(ret, ',', ret_len); \
793 if (use_ldcache) \
794 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
795 needed = p; \
484 xstrcat(ret, needed, ret_len); \ 796 xstrcat(ret, needed, ret_len); \
485 } \ 797 } \
486 *found_needed = 1; \ 798 *found_needed = 1; \
487 } else { \ 799 } else { \
488 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \ 800 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \
524} 836}
525static char *scanelf_file_bind(elfobj *elf, char *found_bind) 837static char *scanelf_file_bind(elfobj *elf, char *found_bind)
526{ 838{
527 unsigned long i; 839 unsigned long i;
528 struct stat s; 840 struct stat s;
841 char dynamic = 0;
529 842
530 if (!show_bind) return NULL; 843 if (!show_bind) return NULL;
531 if (!elf->phdr) return NULL; 844 if (!elf->phdr) return NULL;
532 845
533#define SHOW_BIND(B) \ 846#define SHOW_BIND(B) \
536 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 849 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
537 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 850 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
538 Elf ## B ## _Off offset; \ 851 Elf ## B ## _Off offset; \
539 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 852 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
540 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 853 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
854 dynamic = 1; \
541 offset = EGET(phdr[i].p_offset); \ 855 offset = EGET(phdr[i].p_offset); \
542 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 856 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
543 dyn = DYN ## B (elf->data + offset); \ 857 dyn = DYN ## B (elf->data + offset); \
544 while (EGET(dyn->d_tag) != DT_NULL) { \ 858 while (EGET(dyn->d_tag) != DT_NULL) { \
545 if (EGET(dyn->d_tag) == DT_BIND_NOW || \ 859 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
556 SHOW_BIND(32) 870 SHOW_BIND(32)
557 SHOW_BIND(64) 871 SHOW_BIND(64)
558 872
559 if (be_wewy_wewy_quiet) return NULL; 873 if (be_wewy_wewy_quiet) return NULL;
560 874
875 /* 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)) { 876 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
562 return NULL; 877 return NULL;
563 } else { 878 } else {
564 *found_bind = 1; 879 *found_bind = 1;
565 return (char *) "LAZY"; 880 return (char *) (dynamic ? "LAZY" : "STATIC");
566 } 881 }
567} 882}
568static char *scanelf_file_soname(elfobj *elf, char *found_soname) 883static char *scanelf_file_soname(elfobj *elf, char *found_soname)
569{ 884{
570 unsigned long i; 885 unsigned long i;
612 return NULL; 927 return NULL;
613} 928}
614static char *scanelf_file_sym(elfobj *elf, char *found_sym) 929static char *scanelf_file_sym(elfobj *elf, char *found_sym)
615{ 930{
616 unsigned long i; 931 unsigned long i;
932 char *ret;
617 void *symtab_void, *strtab_void; 933 void *symtab_void, *strtab_void;
618 934
619 if (!find_sym) return NULL; 935 if (!find_sym) return NULL;
936 ret = find_sym;
620 937
621 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void); 938 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
622 939
623 if (symtab_void && strtab_void) { 940 if (symtab_void && strtab_void) {
624#define FIND_SYM(B) \ 941#define FIND_SYM(B) \
625 if (elf->elf_class == ELFCLASS ## B) { \ 942 if (elf->elf_class == ELFCLASS ## B) { \
626 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 943 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
627 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 944 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
628 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 945 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
629 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 946 unsigned long cnt = EGET(symtab->sh_entsize); \
630 char *symname; \ 947 char *symname; \
948 if (cnt) \
949 cnt = EGET(symtab->sh_size) / cnt; \
631 for (i = 0; i < cnt; ++i) { \ 950 for (i = 0; i < cnt; ++i) { \
632 if (sym->st_name) { \ 951 if (sym->st_name) { \
952 /* make sure the symbol name is in acceptable memory range */ \
633 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 953 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
954 if ((void*)symname > (void*)elf->data_end) { \
955 warnf("%s: corrupt ELF symbols", elf->filename); \
956 ++sym; \
957 continue; \
958 } \
959 /* debug display ... show all symbols and some extra info */ \
634 if (*find_sym == '*') { \ 960 if (*ret == '*') { \
635 printf("%s(%s) %5lX %15s %s\n", \ 961 printf("%s(%s) %5lX %15s %s\n", \
636 ((*found_sym == 0) ? "\n\t" : "\t"), \ 962 ((*found_sym == 0) ? "\n\t" : "\t"), \
637 elf->base_filename, \ 963 elf->base_filename, \
638 (long)sym->st_size, \ 964 (unsigned long)sym->st_size, \
639 (char *)get_elfstttype(sym->st_info), \ 965 get_elfstttype(sym->st_info), \
640 symname); \ 966 symname); \
641 *found_sym = 1; \ 967 *found_sym = 1; \
642 } else if ((strcmp(find_sym, symname) == 0) || \ 968 } else { \
643 (strcmp(symname, versioned_symname) == 0)) \ 969 /* allow the user to specify a comma delimited list of symbols to search for */ \
970 char *this_sym, *this_sym_ver, *next_sym; \
971 this_sym = ret; \
972 this_sym_ver = versioned_symname; \
973 do { \
974 next_sym = strchr(this_sym, ','); \
975 if (next_sym == NULL) \
976 next_sym = this_sym + strlen(this_sym); \
977 /* do we want a defined symbol ? */ \
978 if (*this_sym == '+') { \
979 if (sym->st_shndx == SHN_UNDEF) \
980 goto skip_this_sym##B; \
981 ++this_sym; \
982 ++this_sym_ver; \
983 /* do we want an undefined symbol ? */ \
984 } else if (*this_sym == '-') { \
985 if (sym->st_shndx != SHN_UNDEF) \
986 goto skip_this_sym##B; \
987 ++this_sym; \
988 ++this_sym_ver; \
989 } \
990 /* ok, lets compare the name now */ \
991 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
992 (strncmp(this_sym_ver, symname, strlen(this_sym_ver)) == 0)) { \
993 if (be_semi_verbose) { \
994 char buf[126]; \
995 snprintf(buf, sizeof(buf), "%lX %s %s", \
996 (unsigned long)sym->st_size, get_elfstttype(sym->st_info), this_sym); \
997 ret = buf; \
998 } else \
999 ret = this_sym; \
644 (*found_sym)++; \ 1000 (*found_sym)++; \
1001 goto break_out; \
1002 } \
1003 skip_this_sym##B: this_sym = next_sym + 1; \
1004 } while (*next_sym != '\0'); \
1005 } \
645 } \ 1006 } \
646 ++sym; \ 1007 ++sym; \
647 } } 1008 } }
648 FIND_SYM(32) 1009 FIND_SYM(32)
649 FIND_SYM(64) 1010 FIND_SYM(64)
650 } 1011 }
651 1012
1013break_out:
652 if (be_wewy_wewy_quiet) return NULL; 1014 if (be_wewy_wewy_quiet) return NULL;
653 1015
654 if (*find_sym != '*' && *found_sym) 1016 if (*find_sym != '*' && *found_sym)
655 return find_sym; 1017 return ret;
656 if (be_quiet) 1018 if (be_quiet)
657 return NULL; 1019 return NULL;
658 else 1020 else
659 return (char *)" - "; 1021 return (char *)" - ";
660} 1022}
1023
1024
1025static char *scanelf_file_sections(elfobj *elf, char *found_section)
1026{
1027 if (!find_section)
1028 return NULL;
1029
1030#define FIND_SECTION(B) \
1031 if (elf->elf_class == ELFCLASS ## B) { \
1032 int invert; \
1033 Elf ## B ## _Shdr *section; \
1034 invert = (*find_section == '!' ? 1 : 0); \
1035 section = SHDR ## B (elf_findsecbyname(elf, find_section+invert)); \
1036 if ((section == NULL && invert) || (section != NULL && !invert)) \
1037 *found_section = 1; \
1038 }
1039 FIND_SECTION(32)
1040 FIND_SECTION(64)
1041
1042 if (be_wewy_wewy_quiet)
1043 return NULL;
1044
1045 if (*found_section)
1046 return find_section;
1047
1048 if (be_quiet)
1049 return NULL;
1050 else
1051 return (char *)" - ";
1052}
1053
661/* scan an elf file and show all the fun stuff */ 1054/* scan an elf file and show all the fun stuff */
662#define prints(str) write(fileno(stdout), str, strlen(str)) 1055#define prints(str) write(fileno(stdout), str, strlen(str))
663static void scanelf_file(const char *filename) 1056static int scanelf_elfobj(elfobj *elf)
664{ 1057{
665 unsigned long i; 1058 unsigned long i;
666 char found_pax, found_phdr, found_relro, found_load, found_textrel, 1059 char found_pax, found_phdr, found_relro, found_load, found_textrel,
667 found_rpath, found_needed, found_interp, found_bind, found_soname, 1060 found_rpath, found_needed, found_interp, found_bind, found_soname,
668 found_sym, found_lib, found_file, found_textrels; 1061 found_sym, found_lib, found_file, found_textrels, found_section;
669 elfobj *elf;
670 struct stat st;
671 static char *out_buffer = NULL; 1062 static char *out_buffer = NULL;
672 static size_t out_len; 1063 static size_t out_len;
673 1064
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 = \ 1065 found_pax = found_phdr = found_relro = found_load = found_textrel = \
690 found_rpath = found_needed = found_interp = found_bind = found_soname = \ 1066 found_rpath = found_needed = found_interp = found_bind = found_soname = \
691 found_sym = found_lib = found_file = found_textrels = 0; 1067 found_sym = found_lib = found_file = found_textrels = found_section = 0;
692 1068
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) 1069 if (be_verbose > 2)
700 printf("%s: scanning file {%s,%s}\n", filename, 1070 printf("%s: scanning file {%s,%s}\n", elf->filename,
701 get_elfeitype(EI_CLASS, elf->elf_class), 1071 get_elfeitype(EI_CLASS, elf->elf_class),
702 get_elfeitype(EI_DATA, elf->data[EI_DATA])); 1072 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
703 else if (be_verbose) 1073 else if (be_verbose > 1)
704 printf("%s: scanning file\n", filename); 1074 printf("%s: scanning file\n", elf->filename);
705 1075
706 /* init output buffer */ 1076 /* init output buffer */
707 if (!out_buffer) { 1077 if (!out_buffer) {
708 out_len = sizeof(char) * 80; 1078 out_len = sizeof(char) * 80;
709 out_buffer = (char*)xmalloc(out_len); 1079 out_buffer = (char*)xmalloc(out_len);
714 if (!be_quiet && show_banner) { 1084 if (!be_quiet && show_banner) {
715 for (i = 0; out_format[i]; ++i) { 1085 for (i = 0; out_format[i]; ++i) {
716 if (!IS_MODIFIER(out_format[i])) continue; 1086 if (!IS_MODIFIER(out_format[i])) continue;
717 1087
718 switch (out_format[++i]) { 1088 switch (out_format[++i]) {
1089 case '+': break;
719 case '%': break; 1090 case '%': break;
720 case '#': break; 1091 case '#': break;
721 case 'F': 1092 case 'F':
722 case 'p': 1093 case 'p':
723 case 'f': prints("FILE "); found_file = 1; break; 1094 case 'f': prints("FILE "); found_file = 1; break;
724 case 'o': prints(" TYPE "); break; 1095 case 'o': prints(" TYPE "); break;
725 case 'x': prints(" PAX "); break; 1096 case 'x': prints(" PAX "); break;
726 case 'e': prints("STK/REL/PTL "); break; 1097 case 'e': prints("STK/REL/PTL "); break;
727 case 't': prints("TEXTREL "); break; 1098 case 't': prints("TEXTREL "); break;
728 case 'r': prints("RPATH "); break; 1099 case 'r': prints("RPATH "); break;
1100 case 'M': prints("CLASS "); break;
729 case 'n': prints("NEEDED "); break; 1101 case 'n': prints("NEEDED "); break;
730 case 'i': prints("INTERP "); break; 1102 case 'i': prints("INTERP "); break;
731 case 'b': prints("BIND "); break; 1103 case 'b': prints("BIND "); break;
732 case 'S': prints("SONAME "); break; 1104 case 'S': prints("SONAME "); break;
733 case 's': prints("SYM "); break; 1105 case 's': prints("SYM "); break;
734 case 'N': prints("LIB "); break; 1106 case 'N': prints("LIB "); break;
735 case 'T': prints("TEXTRELS "); break; 1107 case 'T': prints("TEXTRELS "); break;
1108 case 'k': prints("SECTION "); break;
1109 case 'a': prints("ARCH "); break;
736 default: warnf("'%c' has no title ?", out_format[i]); 1110 default: warnf("'%c' has no title ?", out_format[i]);
737 } 1111 }
738 } 1112 }
739 if (!found_file) prints("FILE "); 1113 if (!found_file) prints("FILE ");
740 prints("\n"); 1114 prints("\n");
745 /* dump all the good stuff */ 1119 /* dump all the good stuff */
746 for (i = 0; out_format[i]; ++i) { 1120 for (i = 0; out_format[i]; ++i) {
747 const char *out; 1121 const char *out;
748 const char *tmp; 1122 const char *tmp;
749 1123
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])) { 1124 if (!IS_MODIFIER(out_format[i])) {
755 xchrcat(&out_buffer, out_format[i], &out_len); 1125 xchrcat(&out_buffer, out_format[i], &out_len);
756 continue; 1126 continue;
757 } 1127 }
758 1128
759 out = NULL; 1129 out = NULL;
760 be_wewy_wewy_quiet = (out_format[i] == '#'); 1130 be_wewy_wewy_quiet = (out_format[i] == '#');
1131 be_semi_verbose = (out_format[i] == '+');
761 switch (out_format[++i]) { 1132 switch (out_format[++i]) {
1133 case '+':
762 case '%': 1134 case '%':
763 case '#': 1135 case '#':
764 xchrcat(&out_buffer, out_format[i], &out_len); break; 1136 xchrcat(&out_buffer, out_format[i], &out_len); break;
765 case 'F': 1137 case 'F':
766 found_file = 1; 1138 found_file = 1;
767 if (be_wewy_wewy_quiet) break; 1139 if (be_wewy_wewy_quiet) break;
768 xstrcat(&out_buffer, filename, &out_len); 1140 xstrcat(&out_buffer, elf->filename, &out_len);
769 break; 1141 break;
770 case 'p': 1142 case 'p':
771 found_file = 1; 1143 found_file = 1;
772 if (be_wewy_wewy_quiet) break; 1144 if (be_wewy_wewy_quiet) break;
773 tmp = filename; 1145 tmp = elf->filename;
774 if (search_path) { 1146 if (search_path) {
775 ssize_t len_search = strlen(search_path); 1147 ssize_t len_search = strlen(search_path);
776 ssize_t len_file = strlen(filename); 1148 ssize_t len_file = strlen(elf->filename);
777 if (!strncmp(filename, search_path, len_search) && \ 1149 if (!strncmp(elf->filename, search_path, len_search) && \
778 len_file > len_search) 1150 len_file > len_search)
779 tmp += len_search; 1151 tmp += len_search;
780 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++; 1152 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
781 } 1153 }
782 xstrcat(&out_buffer, tmp, &out_len); 1154 xstrcat(&out_buffer, tmp, &out_len);
783 break; 1155 break;
784 case 'f': 1156 case 'f':
785 found_file = 1; 1157 found_file = 1;
786 if (be_wewy_wewy_quiet) break; 1158 if (be_wewy_wewy_quiet) break;
787 tmp = strrchr(filename, '/'); 1159 tmp = strrchr(elf->filename, '/');
788 tmp = (tmp == NULL ? filename : tmp+1); 1160 tmp = (tmp == NULL ? elf->filename : tmp+1);
789 xstrcat(&out_buffer, tmp, &out_len); 1161 xstrcat(&out_buffer, tmp, &out_len);
790 break; 1162 break;
791 case 'o': out = get_elfetype(elf); break; 1163 case 'o': out = get_elfetype(elf); break;
792 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1164 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; 1165 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; 1166 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
795 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break; 1167 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; 1168 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1169 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
797 case 'n': 1170 case 'n':
798 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break; 1171 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; 1172 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
800 case 'b': out = scanelf_file_bind(elf, &found_bind); break; 1173 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
801 case 'S': out = scanelf_file_soname(elf, &found_soname); break; 1174 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
802 case 's': out = scanelf_file_sym(elf, &found_sym); break; 1175 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1176 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1177 case 'a': out = get_elfemtype(elf); break;
803 default: warnf("'%c' has no scan code?", out_format[i]); 1178 default: warnf("'%c' has no scan code?", out_format[i]);
804 } 1179 }
1180 if (out) {
1181 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
1182 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
1183 xstrncat(&out_buffer, out, &out_len, (tmp-out));
1184 else
805 if (out) xstrcat(&out_buffer, out, &out_len); 1185 xstrcat(&out_buffer, out, &out_len);
1186 }
806 } 1187 }
807 1188
808#define FOUND_SOMETHING() \ 1189#define FOUND_SOMETHING() \
809 (found_pax || found_phdr || found_relro || found_load || found_textrel || \ 1190 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
810 found_rpath || found_needed || found_interp || found_bind || \ 1191 found_rpath || found_needed || found_interp || found_bind || \
811 found_soname || found_sym || found_lib || found_textrels) 1192 found_soname || found_sym || found_lib || found_textrels || found_section )
812 1193
813 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) { 1194 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
814 xchrcat(&out_buffer, ' ', &out_len); 1195 xchrcat(&out_buffer, ' ', &out_len);
815 xstrcat(&out_buffer, filename, &out_len); 1196 xstrcat(&out_buffer, elf->filename, &out_len);
816 } 1197 }
817 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) { 1198 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
818 puts(out_buffer); 1199 puts(out_buffer);
819 fflush(stdout); 1200 fflush(stdout);
820 } 1201 }
821 1202
1203 return 0;
1204}
1205
1206/* scan a single elf */
1207static int scanelf_elf(const char *filename, int fd, size_t len)
1208{
1209 int ret = 1;
1210 elfobj *elf;
1211
1212 /* verify this is real ELF */
1213 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1214 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1215 return ret;
1216 }
1217 switch (match_bits) {
1218 case 32:
1219 if (elf->elf_class != ELFCLASS32)
1220 goto label_done;
1221 break;
1222 case 64:
1223 if (elf->elf_class != ELFCLASS64)
1224 goto label_done;
1225 break;
1226 default: break;
1227 }
1228 if (strlen(match_etypes)) {
1229 char sbuf[126];
1230 strncpy(sbuf, match_etypes, sizeof(sbuf));
1231 if (strchr(match_etypes, ',') != NULL) {
1232 char *p;
1233 while((p = strrchr(sbuf, ',')) != NULL) {
1234 *p = 0;
1235 if (etype_lookup(p+1) == get_etype(elf))
1236 goto label_ret;
1237 }
1238 }
1239 if (etype_lookup(sbuf) != get_etype(elf))
1240 goto label_done;
1241 }
1242
1243label_ret:
1244 ret = scanelf_elfobj(elf);
1245
1246label_done:
822 unreadelf(elf); 1247 unreadelf(elf);
1248 return ret;
1249}
1250
1251/* scan an archive of elfs */
1252static int scanelf_archive(const char *filename, int fd, size_t len)
1253{
1254 archive_handle *ar;
1255 archive_member *m;
1256 char *ar_buffer;
1257 elfobj *elf;
1258
1259 ar = ar_open_fd(filename, fd);
1260 if (ar == NULL)
1261 return 1;
1262
1263 ar_buffer = (char*)mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1264 while ((m=ar_next(ar)) != NULL) {
1265 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size);
1266 if (elf) {
1267 scanelf_elfobj(elf);
1268 unreadelf(elf);
1269 }
1270 }
1271 munmap(ar_buffer, len);
1272
1273 return 0;
1274}
1275/* scan a file which may be an elf or an archive or some other magical beast */
1276static int scanelf_file(const char *filename, const struct stat *st_cache)
1277{
1278 const struct stat *st = st_cache;
1279 struct stat symlink_st;
1280 int fd;
1281
1282 /* always handle regular files and handle symlinked files if no -y */
1283 if (S_ISLNK(st->st_mode)) {
1284 if (!scan_symlink) return 1;
1285 stat(filename, &symlink_st);
1286 st = &symlink_st;
1287 }
1288
1289 if (!S_ISREG(st->st_mode)) {
1290 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1291 return 1;
1292 }
1293
1294 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1295 return 1;
1296
1297 if (scanelf_elf(filename, fd, st->st_size) == 1 && scan_archives)
1298 /* if it isn't an ELF, maybe it's an .a archive */
1299 scanelf_archive(filename, fd, st->st_size);
1300
1301 close(fd);
1302 return 0;
823} 1303}
824 1304
825/* scan a directory for ET_EXEC files and print when we find one */ 1305/* scan a directory for ET_EXEC files and print when we find one */
826static void scanelf_dir(const char *path) 1306static int scanelf_dir(const char *path)
827{ 1307{
828 register DIR *dir; 1308 register DIR *dir;
829 register struct dirent *dentry; 1309 register struct dirent *dentry;
830 struct stat st_top, st; 1310 struct stat st_top, st;
831 char buf[_POSIX_PATH_MAX]; 1311 char buf[__PAX_UTILS_PATH_MAX];
832 size_t pathlen = 0, len = 0; 1312 size_t pathlen = 0, len = 0;
1313 int ret = 0;
833 1314
834 /* make sure path exists */ 1315 /* make sure path exists */
835 if (lstat(path, &st_top) == -1) { 1316 if (lstat(path, &st_top) == -1) {
836 if (be_verbose > 2) printf("%s: does not exist\n", path); 1317 if (be_verbose > 2) printf("%s: does not exist\n", path);
837 return; 1318 return 1;
838 } 1319 }
839 1320
840 /* ok, if it isn't a directory, assume we can open it */ 1321 /* ok, if it isn't a directory, assume we can open it */
841 if (!S_ISDIR(st_top.st_mode)) { 1322 if (!S_ISDIR(st_top.st_mode)) {
842 scanelf_file(path); 1323 return scanelf_file(path, &st_top);
843 return;
844 } 1324 }
845 1325
846 /* now scan the dir looking for fun stuff */ 1326 /* now scan the dir looking for fun stuff */
847 if ((dir = opendir(path)) == NULL) { 1327 if ((dir = opendir(path)) == NULL) {
848 warnf("could not opendir %s: %s", path, strerror(errno)); 1328 warnf("could not opendir %s: %s", path, strerror(errno));
849 return; 1329 return 1;
850 } 1330 }
851 if (be_verbose) printf("%s: scanning dir\n", path); 1331 if (be_verbose > 1) printf("%s: scanning dir\n", path);
852 1332
853 pathlen = strlen(path); 1333 pathlen = strlen(path);
854 while ((dentry = readdir(dir))) { 1334 while ((dentry = readdir(dir))) {
855 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1335 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
856 continue; 1336 continue;
858 if (len >= sizeof(buf)) { 1338 if (len >= sizeof(buf)) {
859 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path, 1339 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
860 (unsigned long)len, (unsigned long)sizeof(buf)); 1340 (unsigned long)len, (unsigned long)sizeof(buf));
861 continue; 1341 continue;
862 } 1342 }
863 sprintf(buf, "%s/%s", path, dentry->d_name); 1343 snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name);
864 if (lstat(buf, &st) != -1) { 1344 if (lstat(buf, &st) != -1) {
865 if (S_ISREG(st.st_mode)) 1345 if (S_ISREG(st.st_mode))
866 scanelf_file(buf); 1346 ret = scanelf_file(buf, &st);
867 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1347 else if (dir_recurse && S_ISDIR(st.st_mode)) {
868 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1348 if (dir_crossmount || (st_top.st_dev == st.st_dev))
869 scanelf_dir(buf); 1349 ret = scanelf_dir(buf);
870 } 1350 }
871 } 1351 }
872 } 1352 }
873 closedir(dir); 1353 closedir(dir);
1354 return ret;
874} 1355}
875 1356
876static int scanelf_from_file(char *filename) 1357static int scanelf_from_file(const char *filename)
877{ 1358{
878 FILE *fp = NULL; 1359 FILE *fp = NULL;
879 char *p; 1360 char *p;
880 char path[_POSIX_PATH_MAX]; 1361 char path[__PAX_UTILS_PATH_MAX];
1362 int ret = 0;
881 1363
882 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL)) 1364 if (strcmp(filename, "-") == 0)
883 fp = stdin; 1365 fp = stdin;
884 else if ((fp = fopen(filename, "r")) == NULL) 1366 else if ((fp = fopen(filename, "r")) == NULL)
885 return 1; 1367 return 1;
886 1368
887 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1369 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
888 if ((p = strchr(path, '\n')) != NULL) 1370 if ((p = strchr(path, '\n')) != NULL)
889 *p = 0; 1371 *p = 0;
890 search_path = path; 1372 search_path = path;
891 scanelf_dir(path); 1373 ret = scanelf_dir(path);
892 } 1374 }
893 if (fp != stdin) 1375 if (fp != stdin)
894 fclose(fp); 1376 fclose(fp);
895 return 0; 1377 return ret;
896} 1378}
897 1379
898static void load_ld_so_conf() 1380#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1381
1382static int load_ld_cache_config(int i, const char *fname)
899{ 1383{
900 FILE *fp = NULL; 1384 FILE *fp = NULL;
901 char *p; 1385 char *p;
902 char path[_POSIX_PATH_MAX]; 1386 char path[__PAX_UTILS_PATH_MAX];
903 int i = 0;
904 1387
905 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1388 if (i + 1 == ARRAY_SIZE(ldpaths))
906 return; 1389 return i;
907 1390
1391 if ((fp = fopen(fname, "r")) == NULL)
1392 return i;
1393
908 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1394 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
909 if (*path != '/')
910 continue;
911
912 if ((p = strrchr(path, '\r')) != NULL) 1395 if ((p = strrchr(path, '\r')) != NULL)
913 *p = 0; 1396 *p = 0;
914 if ((p = strchr(path, '\n')) != NULL) 1397 if ((p = strchr(path, '\n')) != NULL)
915 *p = 0; 1398 *p = 0;
1399#ifdef __linux__
1400 // recursive includes of the same file will make this segfault.
1401 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1402 glob64_t gl;
1403 size_t x;
1404 char gpath[__PAX_UTILS_PATH_MAX];
1405
1406 memset(gpath, 0, sizeof(gpath));
1407
1408 if (path[8] != '/')
1409 snprintf(gpath, sizeof(gpath), "/etc/%s", &path[8]);
1410 else
1411 strncpy(gpath, &path[8], sizeof(gpath));
1412
1413 if ((glob64(gpath, 0, NULL, &gl)) == 0) {
1414 for (x = 0; x < gl.gl_pathc; ++x) {
1415 /* try to avoid direct loops */
1416 if (strcmp(gl.gl_pathv[x], fname) == 0)
1417 continue;
1418 i = load_ld_cache_config(i, gl.gl_pathv[x]);
1419 if (i + 1 >= ARRAY_SIZE(ldpaths)) {
1420 globfree64(&gl);
1421 return i;
1422 }
1423 }
1424 globfree64 (&gl);
1425 continue;
1426 }
1427 }
1428#endif
1429 if (*path != '/')
1430 continue;
916 1431
917 ldpaths[i++] = xstrdup(path); 1432 ldpaths[i++] = xstrdup(path);
918 1433
919 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths)) 1434 if (i + 1 == ARRAY_SIZE(ldpaths))
920 break; 1435 break;
921 } 1436 }
922 ldpaths[i] = NULL; 1437 ldpaths[i] = NULL;
923 1438
924 fclose(fp); 1439 fclose(fp);
1440 return i;
925} 1441}
1442
1443#elif defined(__FreeBSD__) || (__DragonFly__)
1444
1445static int load_ld_cache_config(int i, const char *fname)
1446{
1447 FILE *fp = NULL;
1448 char *b = NULL, *p;
1449 struct elfhints_hdr hdr;
1450
1451 if (i + 1 == ARRAY_SIZE(ldpaths))
1452 return i;
1453
1454 if ((fp = fopen(fname, "r")) == NULL)
1455 return i;
1456
1457 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1458 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1459 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1460 {
1461 fclose(fp);
1462 return i;
1463 }
1464
1465 b = (char*)malloc(hdr.dirlistlen+1);
1466 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1467 fclose(fp);
1468 free(b);
1469 return i;
1470 }
1471
1472 while ((p = strsep(&b, ":"))) {
1473 if (*p == '\0') continue;
1474 ldpaths[i++] = xstrdup(p);
1475
1476 if (i + 1 == ARRAY_SIZE(ldpaths))
1477 break;
1478 }
1479 ldpaths[i] = NULL;
1480
1481 free(b);
1482 fclose(fp);
1483 return i;
1484}
1485
1486#else
1487
1488#warning Cache config support not implemented for your target
1489static int load_ld_cache_config(int i, const char *fname)
1490{
1491 memset(ldpaths, 0x00, sizeof(ldpaths));
1492}
1493
1494#endif
926 1495
927/* scan /etc/ld.so.conf for paths */ 1496/* scan /etc/ld.so.conf for paths */
928static void scanelf_ldpath() 1497static void scanelf_ldpath()
929{ 1498{
930 char scan_l, scan_ul, scan_ull; 1499 char scan_l, scan_ul, scan_ull;
964 } 1533 }
965 1534
966 free(path); 1535 free(path);
967} 1536}
968 1537
969
970
971/* usage / invocation handling functions */ 1538/* usage / invocation handling functions */
972#define PARSE_FLAGS "plRmyxetrnibSs:gN:TaqvF:f:o:BhV" 1539#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:BhV"
973#define a_argument required_argument 1540#define a_argument required_argument
974static struct option const long_opts[] = { 1541static struct option const long_opts[] = {
975 {"path", no_argument, NULL, 'p'}, 1542 {"path", no_argument, NULL, 'p'},
976 {"ldpath", no_argument, NULL, 'l'}, 1543 {"ldpath", no_argument, NULL, 'l'},
977 {"recursive", no_argument, NULL, 'R'}, 1544 {"recursive", no_argument, NULL, 'R'},
978 {"mount", no_argument, NULL, 'm'}, 1545 {"mount", no_argument, NULL, 'm'},
979 {"symlink", no_argument, NULL, 'y'}, 1546 {"symlink", no_argument, NULL, 'y'},
1547 {"archives", no_argument, NULL, 'A'},
1548 {"ldcache", no_argument, NULL, 'L'},
1549 {"fix", no_argument, NULL, 'X'},
1550 {"setpax", a_argument, NULL, 'z'},
980 {"pax", no_argument, NULL, 'x'}, 1551 {"pax", no_argument, NULL, 'x'},
981 {"header", no_argument, NULL, 'e'}, 1552 {"header", no_argument, NULL, 'e'},
982 {"textrel", no_argument, NULL, 't'}, 1553 {"textrel", no_argument, NULL, 't'},
983 {"rpath", no_argument, NULL, 'r'}, 1554 {"rpath", no_argument, NULL, 'r'},
984 {"needed", no_argument, NULL, 'n'}, 1555 {"needed", no_argument, NULL, 'n'},
985 {"interp", no_argument, NULL, 'i'}, 1556 {"interp", no_argument, NULL, 'i'},
986 {"bind", no_argument, NULL, 'b'}, 1557 {"bind", no_argument, NULL, 'b'},
987 {"soname", no_argument, NULL, 'S'}, 1558 {"soname", no_argument, NULL, 'S'},
988 {"symbol", a_argument, NULL, 's'}, 1559 {"symbol", a_argument, NULL, 's'},
1560 {"section", a_argument, NULL, 'k'},
989 {"lib", a_argument, NULL, 'N'}, 1561 {"lib", a_argument, NULL, 'N'},
990 {"gmatch", no_argument, NULL, 'g'}, 1562 {"gmatch", no_argument, NULL, 'g'},
991 {"textrels", no_argument, NULL, 'T'}, 1563 {"textrels", no_argument, NULL, 'T'},
1564 {"etype", a_argument, NULL, 'E'},
1565 {"bits", a_argument, NULL, 'M'},
992 {"all", no_argument, NULL, 'a'}, 1566 {"all", no_argument, NULL, 'a'},
993 {"quiet", no_argument, NULL, 'q'}, 1567 {"quiet", no_argument, NULL, 'q'},
994 {"verbose", no_argument, NULL, 'v'}, 1568 {"verbose", no_argument, NULL, 'v'},
995 {"format", a_argument, NULL, 'F'}, 1569 {"format", a_argument, NULL, 'F'},
996 {"from", a_argument, NULL, 'f'}, 1570 {"from", a_argument, NULL, 'f'},
1004static const char *opts_help[] = { 1578static const char *opts_help[] = {
1005 "Scan all directories in PATH environment", 1579 "Scan all directories in PATH environment",
1006 "Scan all directories in /etc/ld.so.conf", 1580 "Scan all directories in /etc/ld.so.conf",
1007 "Scan directories recursively", 1581 "Scan directories recursively",
1008 "Don't recursively cross mount points", 1582 "Don't recursively cross mount points",
1009 "Don't scan symlinks\n", 1583 "Don't scan symlinks",
1584 "Scan archives (.a files)",
1585 "Utilize ld.so.cache information (use with -r/-n)",
1586 "Try and 'fix' bad things (use with -r/-e)",
1587 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1010 "Print PaX markings", 1588 "Print PaX markings",
1011 "Print GNU_STACK/PT_LOAD markings", 1589 "Print GNU_STACK/PT_LOAD markings",
1012 "Print TEXTREL information", 1590 "Print TEXTREL information",
1013 "Print RPATH information", 1591 "Print RPATH information",
1014 "Print NEEDED information", 1592 "Print NEEDED information",
1015 "Print INTERP information", 1593 "Print INTERP information",
1016 "Print BIND information", 1594 "Print BIND information",
1017 "Print SONAME information", 1595 "Print SONAME information",
1018 "Find a specified symbol", 1596 "Find a specified symbol",
1597 "Find a specified section",
1019 "Find a specified library", 1598 "Find a specified library",
1020 "Use strncmp to match libraries. (use with -N)", 1599 "Use strncmp to match libraries. (use with -N)",
1021 "Locate cause of TEXTREL", 1600 "Locate cause of TEXTREL",
1601 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1602 "Print only ELF files matching numeric bits",
1022 "Print all scanned info (-x -e -t -r -b)\n", 1603 "Print all scanned info (-x -e -t -r -b)\n",
1023 "Only output 'bad' things", 1604 "Only output 'bad' things",
1024 "Be verbose (can be specified more than once)", 1605 "Be verbose (can be specified more than once)",
1025 "Use specified format for output", 1606 "Use specified format for output",
1026 "Read input stream from a filename", 1607 "Read input stream from a filename",
1034/* display usage and exit */ 1615/* display usage and exit */
1035static void usage(int status) 1616static void usage(int status)
1036{ 1617{
1037 unsigned long i; 1618 unsigned long i;
1038 printf("* Scan ELF binaries for stuff\n\n" 1619 printf("* Scan ELF binaries for stuff\n\n"
1039 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0); 1620 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1040 printf("Options: -[%s]\n", PARSE_FLAGS); 1621 printf("Options: -[%s]\n", PARSE_FLAGS);
1041 for (i = 0; long_opts[i].name; ++i) 1622 for (i = 0; long_opts[i].name; ++i)
1042 if (long_opts[i].has_arg == no_argument) 1623 if (long_opts[i].has_arg == no_argument)
1043 printf(" -%c, --%-13s* %s\n", long_opts[i].val, 1624 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
1044 long_opts[i].name, opts_help[i]); 1625 long_opts[i].name, opts_help[i]);
1045 else 1626 else
1046 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val, 1627 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
1047 long_opts[i].name, opts_help[i]); 1628 long_opts[i].name, opts_help[i]);
1048 1629
1049 if (status != EXIT_SUCCESS) 1630 if (status != EXIT_SUCCESS)
1050 exit(status); 1631 exit(status);
1051 1632
1052 puts("\nThe format modifiers for the -F option are:"); 1633 puts("\nThe format modifiers for the -F option are:");
1053 puts(" F Filename \tx PaX Flags \te STACK/RELRO"); 1634 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1054 puts(" t TEXTREL \tr RPATH \tn NEEDED"); 1635 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1055 puts(" i INTERP \tb BIND \ts symbol"); 1636 puts(" i INTERP \tb BIND \ts symbol");
1056 puts(" N library \to Type \tT TEXTRELs"); 1637 puts(" N library \to Type \tT TEXTRELs");
1057 puts(" S SONAME"); 1638 puts(" S SONAME \tk section \ta arch");
1058 puts(" p filename (with search path removed)"); 1639 puts(" p filename (with search path removed)");
1059 puts(" f filename (short name/basename)"); 1640 puts(" f filename (short name/basename)");
1060 puts("Prefix each modifier with '%' (verbose) or '#' (silent)"); 1641 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1061 1642
1643 puts("\nELF Etypes:");
1644 print_etypes(stdout);
1645
1062 exit(status); 1646 exit(status);
1063} 1647}
1064 1648
1065/* parse command line arguments and preform needed actions */ 1649/* parse command line arguments and preform needed actions */
1650#define do_pax_state(option, flag) \
1651 if (islower(option)) { \
1652 flags &= ~PF_##flag; \
1653 flags |= PF_NO##flag; \
1654 } else { \
1655 flags &= ~PF_NO##flag; \
1656 flags |= PF_##flag; \
1657 }
1066static void parseargs(int argc, char *argv[]) 1658static int parseargs(int argc, char *argv[])
1067{ 1659{
1068 int i; 1660 int i;
1069 char *from_file = NULL; 1661 const char *from_file = NULL;
1662 int ret = 0;
1070 1663
1071 opterr = 0; 1664 opterr = 0;
1072 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 1665 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1073 switch (i) { 1666 switch (i) {
1074 1667
1078 VERSION, __FILE__, __DATE__, rcsid, argv0); 1671 VERSION, __FILE__, __DATE__, rcsid, argv0);
1079 exit(EXIT_SUCCESS); 1672 exit(EXIT_SUCCESS);
1080 break; 1673 break;
1081 case 'h': usage(EXIT_SUCCESS); break; 1674 case 'h': usage(EXIT_SUCCESS); break;
1082 case 'f': 1675 case 'f':
1083 if (from_file) err("Don't specify -f twice"); 1676 if (from_file) warn("You prob don't want to specify -f twice");
1084 from_file = xstrdup(optarg); 1677 from_file = optarg;
1678 break;
1679 case 'E':
1680 strncpy(match_etypes, optarg, sizeof(match_etypes));
1681 break;
1682 case 'M':
1683 match_bits = atoi(optarg);
1085 break; 1684 break;
1086 case 'o': { 1685 case 'o': {
1087 FILE *fp = NULL;
1088 if ((fp = freopen(optarg, "w", stdout)) == NULL) 1686 if (freopen(optarg, "w", stdout) == NULL)
1089 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 1687 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1090 SET_STDOUT(fp);
1091 break; 1688 break;
1092 } 1689 }
1093 1690 case 'k':
1691 if (find_section) warn("You prob don't want to specify -k twice");
1692 find_section = optarg;
1693 break;
1094 case 's': { 1694 case 's': {
1095 size_t len;
1096 if (find_sym) err("Don't specify -s twice"); 1695 if (find_sym) warn("You prob don't want to specify -s twice");
1097 find_sym = xstrdup(optarg); 1696 find_sym = optarg;
1098 len = strlen(find_sym) + 1;
1099 versioned_symname = (char*)xmalloc(sizeof(char) * (len+1)); 1697 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1100 sprintf(versioned_symname, "%s@", find_sym); 1698 sprintf(versioned_symname, "%s@", find_sym);
1101 break; 1699 break;
1102 } 1700 }
1103 case 'N': { 1701 case 'N': {
1104 if (find_lib) err("Don't specify -N twice"); 1702 if (find_lib) warn("You prob don't want to specify -N twice");
1105 find_lib = xstrdup(optarg); 1703 find_lib = optarg;
1106 break; 1704 break;
1107 } 1705 }
1108 1706
1109 case 'F': { 1707 case 'F': {
1110 if (out_format) err("Don't specify -F twice"); 1708 if (out_format) warn("You prob don't want to specify -F twice");
1111 out_format = xstrdup(optarg); 1709 out_format = optarg;
1112 break; 1710 break;
1113 } 1711 }
1712 case 'z': {
1713 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1714 size_t x;
1114 1715
1716 for (x = 0 ; x < strlen(optarg); x++) {
1717 switch(optarg[x]) {
1718 case 'p':
1719 case 'P':
1720 do_pax_state(optarg[x], PAGEEXEC);
1721 break;
1722 case 's':
1723 case 'S':
1724 do_pax_state(optarg[x], SEGMEXEC);
1725 break;
1726 case 'm':
1727 case 'M':
1728 do_pax_state(optarg[x], MPROTECT);
1729 break;
1730 case 'e':
1731 case 'E':
1732 do_pax_state(optarg[x], EMUTRAMP);
1733 break;
1734 case 'r':
1735 case 'R':
1736 do_pax_state(optarg[x], RANDMMAP);
1737 break;
1738 case 'x':
1739 case 'X':
1740 do_pax_state(optarg[x], RANDEXEC);
1741 break;
1742 default:
1743 break;
1744 }
1745 }
1746 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
1747 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
1748 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
1749 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
1750 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1751 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1752 setpax = flags;
1753 break;
1754 }
1115 case 'g': gmatch = 1; 1755 case 'g': gmatch = 1; break;
1756 case 'L': use_ldcache = 1; break;
1116 case 'y': scan_symlink = 0; break; 1757 case 'y': scan_symlink = 0; break;
1758 case 'A': scan_archives = 1; break;
1117 case 'B': show_banner = 0; break; 1759 case 'B': show_banner = 0; break;
1118 case 'l': scan_ldpath = 1; break; 1760 case 'l': scan_ldpath = 1; break;
1119 case 'p': scan_envpath = 1; break; 1761 case 'p': scan_envpath = 1; break;
1120 case 'R': dir_recurse = 1; break; 1762 case 'R': dir_recurse = 1; break;
1121 case 'm': dir_crossmount = 0; break; 1763 case 'm': dir_crossmount = 0; break;
1764 case 'X': ++fix_elf; break;
1122 case 'x': show_pax = 1; break; 1765 case 'x': show_pax = 1; break;
1123 case 'e': show_phdr = 1; break; 1766 case 'e': show_phdr = 1; break;
1124 case 't': show_textrel = 1; break; 1767 case 't': show_textrel = 1; break;
1125 case 'r': show_rpath = 1; break; 1768 case 'r': show_rpath = 1; break;
1126 case 'n': show_needed = 1; break; 1769 case 'n': show_needed = 1; break;
1131 case 'q': be_quiet = 1; break; 1774 case 'q': be_quiet = 1; break;
1132 case 'v': be_verbose = (be_verbose % 20) + 1; break; 1775 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1133 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break; 1776 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
1134 1777
1135 case ':': 1778 case ':':
1136 err("Option missing parameter\n"); 1779 err("Option '%c' is missing parameter", optopt);
1137 case '?': 1780 case '?':
1138 err("Unknown option\n"); 1781 err("Unknown option '%c' or argument missing", optopt);
1139 default: 1782 default:
1140 err("Unhandled option '%c'", i); 1783 err("Unhandled option '%c'; please report this", i);
1141 }
1142 } 1784 }
1143 1785 }
1786 if (show_textrels && be_verbose) {
1787 if (which("objdump") != NULL)
1788 has_objdump = 1;
1789 }
1144 /* let the format option override all other options */ 1790 /* let the format option override all other options */
1145 if (out_format) { 1791 if (out_format) {
1146 show_pax = show_phdr = show_textrel = show_rpath = \ 1792 show_pax = show_phdr = show_textrel = show_rpath = \
1147 show_needed = show_interp = show_bind = show_soname = \ 1793 show_needed = show_interp = show_bind = show_soname = \
1148 show_textrels = 0; 1794 show_textrels = 0;
1149 for (i = 0; out_format[i]; ++i) { 1795 for (i = 0; out_format[i]; ++i) {
1150 if (!IS_MODIFIER(out_format[i])) continue; 1796 if (!IS_MODIFIER(out_format[i])) continue;
1151 1797
1152 switch (out_format[++i]) { 1798 switch (out_format[++i]) {
1799 case '+': break;
1153 case '%': break; 1800 case '%': break;
1154 case '#': break; 1801 case '#': break;
1155 case 'F': break; 1802 case 'F': break;
1156 case 'p': break; 1803 case 'p': break;
1157 case 'f': break; 1804 case 'f': break;
1805 case 'k': break;
1158 case 's': break; 1806 case 's': break;
1159 case 'N': break; 1807 case 'N': break;
1160 case 'o': break; 1808 case 'o': break;
1809 case 'a': break;
1810 case 'M': break;
1161 case 'x': show_pax = 1; break; 1811 case 'x': show_pax = 1; break;
1162 case 'e': show_phdr = 1; break; 1812 case 'e': show_phdr = 1; break;
1163 case 't': show_textrel = 1; break; 1813 case 't': show_textrel = 1; break;
1164 case 'r': show_rpath = 1; break; 1814 case 'r': show_rpath = 1; break;
1165 case 'n': show_needed = 1; break; 1815 case 'n': show_needed = 1; break;
1166 case 'i': show_interp = 1; break; 1816 case 'i': show_interp = 1; break;
1167 case 'b': show_bind = 1; break; 1817 case 'b': show_bind = 1; break;
1168 case 'S': show_soname = 1; break; 1818 case 'S': show_soname = 1; break;
1169 case 'T': show_textrels = 1; break; 1819 case 'T': show_textrels = 1; break;
1170 default: 1820 default:
1171 err("Invalid format specifier '%c' (byte %i)", 1821 err("Invalid format specifier '%c' (byte %i)",
1172 out_format[i], i+1); 1822 out_format[i], i+1);
1173 } 1823 }
1174 } 1824 }
1175 1825
1176 /* construct our default format */ 1826 /* construct our default format */
1186 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 1836 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1187 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len); 1837 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1188 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len); 1838 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1189 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len); 1839 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1190 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len); 1840 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1841 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1191 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len); 1842 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1192 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 1843 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1193 } 1844 }
1194 if (be_verbose > 2) printf("Format: %s\n", out_format); 1845 if (be_verbose > 2) printf("Format: %s\n", out_format);
1195 1846
1196 /* now lets actually do the scanning */ 1847 /* now lets actually do the scanning */
1197 if (scan_ldpath || (show_rpath && be_quiet)) 1848 if (scan_ldpath || use_ldcache)
1198 load_ld_so_conf(); 1849 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
1199 if (scan_ldpath) scanelf_ldpath(); 1850 if (scan_ldpath) scanelf_ldpath();
1200 if (scan_envpath) scanelf_envpath(); 1851 if (scan_envpath) scanelf_envpath();
1852 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
1853 from_file = "-";
1201 if (from_file) { 1854 if (from_file) {
1202 scanelf_from_file(from_file); 1855 scanelf_from_file(from_file);
1203 free(from_file);
1204 from_file = *argv; 1856 from_file = *argv;
1205 } 1857 }
1206 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file) 1858 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1207 err("Nothing to scan !?"); 1859 err("Nothing to scan !?");
1208 while (optind < argc) { 1860 while (optind < argc) {
1209 search_path = argv[optind++]; 1861 search_path = argv[optind++];
1210 scanelf_dir(search_path); 1862 ret = scanelf_dir(search_path);
1211 } 1863 }
1212 1864
1213 /* clean up */ 1865 /* clean up */
1214 if (find_sym) {
1215 free(find_sym);
1216 free(versioned_symname); 1866 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) 1867 for (i = 0; ldpaths[i]; ++i)
1221 free(ldpaths[i]); 1868 free(ldpaths[i]);
1869
1870 if (ldcache != 0)
1871 munmap(ldcache, ldcache_size);
1872 return ret;
1873}
1874
1875static char **get_split_env(const char *envvar)
1876{
1877 const char *delims = " \t\n";
1878 char **envvals = NULL;
1879 char *env, *s;
1880 int nentry;
1881
1882 if ((env = getenv(envvar)) == NULL)
1883 return NULL;
1884
1885 env = xstrdup(env);
1886 if (env == NULL)
1887 return NULL;
1888
1889 s = strtok(env, delims);
1890 if (s == NULL) {
1891 free(env);
1892 return NULL;
1893 }
1894
1895 nentry = 0;
1896 while (s != NULL) {
1897 ++nentry;
1898 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
1899 envvals[nentry-1] = s;
1900 s = strtok(NULL, delims);
1901 }
1902 envvals[nentry] = NULL;
1903
1904 /* don't want to free(env) as it contains the memory that backs
1905 * the envvals array of strings */
1906 return envvals;
1907}
1908static void parseenv()
1909{
1910 qa_textrels = get_split_env("QA_TEXTRELS");
1911 qa_execstack = get_split_env("QA_EXECSTACK");
1912 qa_wx_load = get_split_env("QA_WX_LOAD");
1913}
1914
1915#ifdef __PAX_UTILS_CLEANUP
1916static void cleanup()
1917{
1918 free(out_format);
1919 free(qa_textrels);
1920 free(qa_execstack);
1921 free(qa_wx_load);
1922}
1923#endif
1924
1925
1926int main(int argc, char *argv[])
1927{
1928 int ret;
1929 if (argc < 2)
1930 usage(EXIT_FAILURE);
1931 parseenv();
1932 ret = parseargs(argc, argv);
1933 fclose(stdout);
1934#ifdef __PAX_UTILS_CLEANUP
1935 cleanup();
1936 warn("The calls to add/delete heap should be off:\n"
1937 "\t- 1 due to the out_buffer not being freed in scanelf_file()\n"
1938 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
1939#endif
1940 return ret;
1222} 1941}
1223 1942
1224 1943
1225 1944
1226/* utility funcs */ 1945/* utility funcs */
1228{ 1947{
1229 char *ret = strdup(s); 1948 char *ret = strdup(s);
1230 if (!ret) err("Could not strdup(): %s", strerror(errno)); 1949 if (!ret) err("Could not strdup(): %s", strerror(errno));
1231 return ret; 1950 return ret;
1232} 1951}
1233
1234static void *xmalloc(size_t size) 1952static void *xmalloc(size_t size)
1235{ 1953{
1236 void *ret = malloc(size); 1954 void *ret = malloc(size);
1237 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size); 1955 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1238 return ret; 1956 return ret;
1239} 1957}
1240 1958static void *xrealloc(void *ptr, size_t size)
1959{
1960 void *ret = realloc(ptr, size);
1961 if (!ret) err("Could not realloc() %li bytes", (unsigned long)size);
1962 return ret;
1963}
1241static void xstrcat(char **dst, const char *src, size_t *curr_len) 1964static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
1242{ 1965{
1243 size_t new_len; 1966 size_t new_len;
1244 1967
1245 new_len = strlen(*dst) + strlen(src); 1968 new_len = strlen(*dst) + strlen(src);
1246 if (*curr_len <= new_len) { 1969 if (*curr_len <= new_len) {
1247 *curr_len = new_len + (*curr_len / 2); 1970 *curr_len = new_len + (*curr_len / 2);
1248 *dst = realloc(*dst, *curr_len); 1971 *dst = realloc(*dst, *curr_len);
1249 if (!*dst) 1972 if (!*dst)
1250 err("could not realloc %li bytes", (unsigned long)*curr_len); 1973 err("could not realloc() %li bytes", (unsigned long)*curr_len);
1251 } 1974 }
1252 1975
1976 if (n)
1977 strncat(*dst, src, n);
1978 else
1253 strcat(*dst, src); 1979 strcat(*dst, src);
1254} 1980}
1255
1256static inline void xchrcat(char **dst, const char append, size_t *curr_len) 1981static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1257{ 1982{
1258 static char my_app[2]; 1983 static char my_app[2];
1259 my_app[0] = append; 1984 my_app[0] = append;
1260 my_app[1] = '\0'; 1985 my_app[1] = '\0';
1261 xstrcat(dst, my_app, curr_len); 1986 xstrcat(dst, my_app, curr_len);
1262} 1987}
1263 1988
1264 1989/* Match filename against entries in matchlist, return TRUE
1265 1990 * if the file is listed */
1266int main(int argc, char *argv[]) 1991static int file_matches_list(const char *filename, char **matchlist)
1267{ 1992{
1268 if (argc < 2) 1993 char **file;
1269 usage(EXIT_FAILURE); 1994 char *match;
1270 parseargs(argc, argv); 1995 char buf[__PAX_UTILS_PATH_MAX];
1271 fclose(stdout); 1996
1272#ifdef __BOUNDS_CHECKING_ON 1997 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()"); 1998 return 0;
1274#endif 1999
1275 return EXIT_SUCCESS; 2000 for (file = matchlist; *file != NULL; file++) {
2001 if (search_path) {
2002 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2003 match = buf;
2004 } else {
2005 match = *file;
2006 }
2007 if (fnmatch(match, filename, 0) == 0)
2008 return 1;
2009 }
2010 return 0;
1276} 2011}

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