/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.88 Revision 1.177
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 1.177 2007/05/20 23:20:46 solar Exp $
5 * 5 *
6 * Copyright 2003-2005 Ned Ludd - <solar@gentoo.org> 6 * Copyright 2003-2006 Ned Ludd - <solar@gentoo.org>
7 * Copyright 2004-2005 Mike Frysinger - <vapier@gentoo.org> 7 * Copyright 2004-2006 Mike Frysinger - <vapier@gentoo.org>
8 */ 8 */
9 9
10#include <stdio.h>
11#include <stdlib.h>
12#include <sys/types.h>
13#include <libgen.h>
14#include <limits.h>
15#define __USE_GNU
16#include <string.h>
17#include <errno.h>
18#include <unistd.h>
19#include <sys/stat.h>
20#include <dirent.h>
21#include <getopt.h>
22#include <assert.h>
23#include "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 1.177 2007/05/20 23:20:46 solar Exp $";
26#define argv0 "scanelf" 13#define argv0 "scanelf"
27 14
28#define IS_MODIFIER(c) (c == '%' || c == '#') 15#define IS_MODIFIER(c) (c == '%' || c == '#' || 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);
36static int rematch(const char *regex, const char *match, int cflags);
43 37
44/* variables to control behavior */ 38/* variables to control behavior */
39static char match_etypes[126] = "";
45static char *ldpaths[256]; 40static char *ldpaths[256];
46static char scan_ldpath = 0; 41static char scan_ldpath = 0;
47static char scan_envpath = 0; 42static char scan_envpath = 0;
48static char scan_symlink = 1; 43static char scan_symlink = 1;
44static char scan_archives = 0;
49static char dir_recurse = 0; 45static char dir_recurse = 0;
50static char dir_crossmount = 1; 46static char dir_crossmount = 1;
51static char show_pax = 0; 47static char show_pax = 0;
52static char show_phdr = 0; 48static char show_phdr = 0;
53static char show_textrel = 0; 49static char show_textrel = 0;
59static char show_textrels = 0; 55static char show_textrels = 0;
60static char show_banner = 1; 56static char show_banner = 1;
61static char be_quiet = 0; 57static char be_quiet = 0;
62static char be_verbose = 0; 58static char be_verbose = 0;
63static char be_wewy_wewy_quiet = 0; 59static char be_wewy_wewy_quiet = 0;
60static char be_semi_verbose = 0;
64static char *find_sym = NULL, *versioned_symname = NULL; 61static char *find_sym = NULL, *versioned_symname = NULL;
65static char *find_lib = NULL; 62static char *find_lib = NULL;
63static char *find_section = NULL;
66static char *out_format = NULL; 64static char *out_format = NULL;
67static char *search_path = NULL; 65static char *search_path = NULL;
66static char fix_elf = 0;
68static char gmatch = 0; 67static char g_match = 0;
68static char use_ldcache = 0;
69 69
70static char **qa_textrels = NULL;
71static char **qa_execstack = NULL;
72static char **qa_wx_load = NULL;
73
74int match_bits = 0;
75caddr_t ldcache = 0;
76size_t ldcache_size = 0;
77unsigned long setpax = 0UL;
78
79int has_objdump = 0;
80
81/* find the path to a file by name */
82static char *which(const char *fname)
83{
84 static char fullpath[BUFSIZ];
85 char *path, *p;
86
87 path = getenv("PATH");
88 if (!path)
89 return NULL;
90
91 path = xstrdup(path);
92 while ((p = strrchr(path, ':')) != NULL) {
93 snprintf(fullpath, sizeof(fullpath), "%s/%s", p + 1, fname);
94 *p = 0;
95 if (access(fullpath, R_OK) != (-1)) {
96 free(path);
97 return (char *) fullpath;
98 }
99 }
100 free(path);
101 return NULL;
102}
103
104/* 1 on failure. 0 otherwise */
105static int rematch(const char *regex, const char *match, int cflags)
106{
107 regex_t preg;
108 int ret;
109
110 if ((match == NULL) || (regex == NULL))
111 return EXIT_FAILURE;
112
113
114 if ((ret = regcomp(&preg, regex, cflags))) {
115 char err[256];
116
117 if (regerror(ret, &preg, err, sizeof(err)))
118 fprintf(stderr, "regcomp failed: %s", err);
119 else
120 fprintf(stderr, "regcomp failed");
121
122 return EXIT_FAILURE;
123 }
124 ret = regexec(&preg, match, 0, NULL, 0);
125 regfree(&preg);
126
127 return ret;
128}
70 129
71/* sub-funcs for scanelf_file() */ 130/* sub-funcs for scanelf_file() */
72static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab) 131static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
73{ 132{
74 /* find the best SHT_DYNSYM and SHT_STRTAB sections */ 133 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
93 } \ 152 } \
94 } 153 }
95 GET_SYMTABS(32) 154 GET_SYMTABS(32)
96 GET_SYMTABS(64) 155 GET_SYMTABS(64)
97} 156}
157
98static char *scanelf_file_pax(elfobj *elf, char *found_pax) 158static char *scanelf_file_pax(elfobj *elf, char *found_pax)
99{ 159{
100 static char *paxflags;
101 static char ret[7]; 160 static char ret[7];
102 unsigned long i, shown; 161 unsigned long i, shown;
103 162
104 if (!show_pax) return NULL; 163 if (!show_pax) return NULL;
105 164
112 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 171 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
113 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 172 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
114 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 173 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
115 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \ 174 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
116 continue; \ 175 continue; \
117 if (be_quiet && (EGET(phdr[i].p_flags) == 10240)) \ 176 if (fix_elf && setpax) { \
177 /* set the paxctl flags */ \
178 ESET(phdr[i].p_flags, setpax); \
179 } \
180 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
118 continue; \ 181 continue; \
119 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \ 182 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
120 *found_pax = 1; \ 183 *found_pax = 1; \
121 ++shown; \ 184 ++shown; \
122 break; \ 185 break; \
124 } 187 }
125 SHOW_PAX(32) 188 SHOW_PAX(32)
126 SHOW_PAX(64) 189 SHOW_PAX(64)
127 } 190 }
128 191
192
193 if (fix_elf && setpax) {
194 /* set the chpax settings */
195 if (elf->elf_class == ELFCLASS32) {
196 if (EHDR32(elf->ehdr)->e_type == ET_DYN || EHDR32(elf->ehdr)->e_type == ET_EXEC)
197 ESET(EHDR32(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
198 } else {
199 if (EHDR64(elf->ehdr)->e_type == ET_DYN || EHDR64(elf->ehdr)->e_type == ET_EXEC)
200 ESET(EHDR64(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
201 }
202 }
203
129 /* fall back to EI_PAX if no PT_PAX was found */ 204 /* fall back to EI_PAX if no PT_PAX was found */
130 if (!*ret) { 205 if (!*ret) {
206 static char *paxflags;
131 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf)); 207 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
132 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) { 208 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
133 *found_pax = 1; 209 *found_pax = 1;
134 return paxflags; 210 return (be_wewy_wewy_quiet ? NULL : paxflags);
135 } 211 }
136 strncpy(ret, paxflags, sizeof(ret)); 212 strncpy(ret, paxflags, sizeof(ret));
137 } 213 }
138 214
139 if (be_quiet && !shown) 215 if (be_wewy_wewy_quiet || (be_quiet && !shown))
140 return NULL; 216 return NULL;
217 else
141 return ret; 218 return ret;
142
143} 219}
220
144static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load) 221static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
145{ 222{
146 static char ret[12]; 223 static char ret[12];
147 char *found; 224 char *found;
148 unsigned long i, off, shown, check_flags;
149 unsigned char multi_stack, multi_relro, multi_load; 225 unsigned long i, shown, multi_stack, multi_relro, multi_load;
226 int max_pt_load;
150 227
151 if (!show_phdr) return NULL; 228 if (!show_phdr) return NULL;
152 229
153 memcpy(ret, "--- --- ---\0", 12); 230 memcpy(ret, "--- --- ---\0", 12);
154 231
155 shown = 0; 232 shown = 0;
156 multi_stack = multi_relro = multi_load = 0; 233 multi_stack = multi_relro = multi_load = 0;
234 max_pt_load = elf_max_pt_load(elf);
157 235
158 if (elf->phdr) { 236#define NOTE_GNU_STACK ".note.GNU-stack"
159#define SHOW_PHDR(B) \ 237#define SHOW_PHDR(B) \
160 if (elf->elf_class == ELFCLASS ## B) { \ 238 if (elf->elf_class == ELFCLASS ## B) { \
161 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 239 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
240 Elf ## B ## _Off offset; \
241 uint32_t flags, check_flags; \
242 if (elf->phdr != NULL) { \
162 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 243 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
163 uint32_t flags; \
164 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 244 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
165 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \ 245 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
246 if (multi_stack++) \
166 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \ 247 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
248 if (file_matches_list(elf->filename, qa_execstack)) \
249 continue; \
167 found = found_phdr; \ 250 found = found_phdr; \
168 off = 0; \ 251 offset = 0; \
169 check_flags = PF_X; \ 252 check_flags = PF_X; \
170 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \ 253 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
254 if (multi_relro++) \
171 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \ 255 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
172 found = found_relro; \ 256 found = found_relro; \
173 off = 4; \ 257 offset = 4; \
174 check_flags = PF_X; \ 258 check_flags = PF_X; \
175 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \ 259 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
176 if (multi_load++ > 2) warnf("%s: more than 2 PT_LOAD's !?", elf->filename); \ 260 if (ehdr->e_type == ET_DYN || ehdr->e_type == ET_EXEC) \
261 if (multi_load++ > max_pt_load) \
262 warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
263 if (file_matches_list(elf->filename, qa_wx_load)) \
264 continue; \
177 found = found_load; \ 265 found = found_load; \
178 off = 8; \ 266 offset = 8; \
179 check_flags = PF_W|PF_X; \ 267 check_flags = PF_W|PF_X; \
180 } else \ 268 } else \
181 continue; \ 269 continue; \
182 flags = EGET(phdr[i].p_flags); \ 270 flags = EGET(phdr[i].p_flags); \
183 if (be_quiet && ((flags & check_flags) != check_flags)) \ 271 if (be_quiet && ((flags & check_flags) != check_flags)) \
184 continue; \ 272 continue; \
273 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
274 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
275 ret[3] = ret[7] = '!'; \
276 flags = EGET(phdr[i].p_flags); \
277 } \
185 memcpy(ret+off, gnu_short_stack_flags(flags), 3); \ 278 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
186 *found = 1; \ 279 *found = 1; \
187 ++shown; \ 280 ++shown; \
281 } \
282 } else if (elf->shdr != NULL) { \
283 /* no program headers which means this is prob an object file */ \
284 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
285 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
286 char *str; \
287 if ((void*)strtbl > (void*)elf->data_end) \
288 goto skip_this_shdr##B; \
289 check_flags = SHF_WRITE|SHF_EXECINSTR; \
290 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
291 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
292 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
293 str = elf->data + offset; \
294 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
295 if (!strcmp(str, NOTE_GNU_STACK)) { \
296 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
297 flags = EGET(shdr[i].sh_flags); \
298 if (be_quiet && ((flags & check_flags) != check_flags)) \
299 continue; \
300 ++*found_phdr; \
301 shown = 1; \
302 if (flags & SHF_WRITE) ret[0] = 'W'; \
303 if (flags & SHF_ALLOC) ret[1] = 'A'; \
304 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
305 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
306 break; \
307 } \
308 } \
309 skip_this_shdr##B: \
310 if (!multi_stack) { \
311 if (file_matches_list(elf->filename, qa_execstack)) \
312 return NULL; \
313 *found_phdr = 1; \
314 shown = 1; \
315 memcpy(ret, "!WX", 3); \
316 } \
188 } \ 317 } \
189 } 318 }
190 SHOW_PHDR(32) 319 SHOW_PHDR(32)
191 SHOW_PHDR(64) 320 SHOW_PHDR(64)
192 }
193 321
194 if (be_quiet && !shown) 322 if (be_wewy_wewy_quiet || (be_quiet && !shown))
195 return NULL; 323 return NULL;
196 else 324 else
197 return ret; 325 return ret;
198} 326}
327
199static char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 328static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
200{ 329{
201 static char ret[] = "TEXTREL"; 330 static const char *ret = "TEXTREL";
202 unsigned long i; 331 unsigned long i;
203 332
204 if (!show_textrel && !show_textrels) return NULL; 333 if (!show_textrel && !show_textrels) return NULL;
334
335 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
205 336
206 if (elf->phdr) { 337 if (elf->phdr) {
207#define SHOW_TEXTREL(B) \ 338#define SHOW_TEXTREL(B) \
208 if (elf->elf_class == ELFCLASS ## B) { \ 339 if (elf->elf_class == ELFCLASS ## B) { \
209 Elf ## B ## _Dyn *dyn; \ 340 Elf ## B ## _Dyn *dyn; \
229 } 360 }
230 361
231 if (be_quiet || be_wewy_wewy_quiet) 362 if (be_quiet || be_wewy_wewy_quiet)
232 return NULL; 363 return NULL;
233 else 364 else
234 return (char *)" - "; 365 return " - ";
235} 366}
236static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel) 367static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
237{ 368{
238 unsigned long s, r, rmax; 369 unsigned long s, r, rmax;
239 void *symtab_void, *strtab_void, *text_void; 370 void *symtab_void, *strtab_void, *text_void;
292 if (be_verbose <= 2) continue; \ 423 if (be_verbose <= 2) continue; \
293 } else \ 424 } else \
294 *found_textrels = 1; \ 425 *found_textrels = 1; \
295 /* locate this relocation symbol name */ \ 426 /* locate this relocation symbol name */ \
296 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 427 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
428 if ((void*)sym > (void*)elf->data_end) { \
429 warn("%s: corrupt ELF symbol", elf->filename); \
430 continue; \
431 } \
297 sym_max = ELF ## B ## _R_SYM(r_info); \ 432 sym_max = ELF ## B ## _R_SYM(r_info); \
298 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \ 433 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
299 sym += sym_max; \ 434 sym += sym_max; \
300 else \ 435 else \
301 sym = NULL; \ 436 sym = NULL; \
303 /* show the raw details about this reloc */ \ 438 /* show the raw details about this reloc */ \
304 printf(" %s: ", elf->base_filename); \ 439 printf(" %s: ", elf->base_filename); \
305 if (sym && sym->st_name) \ 440 if (sym && sym->st_name) \
306 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \ 441 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \
307 else \ 442 else \
308 printf("(memory/fake?)"); \ 443 printf("(memory/data?)"); \
309 printf(" [0x%lX]", (unsigned long)r_offset); \ 444 printf(" [0x%lX]", (unsigned long)r_offset); \
310 /* now try to find the closest symbol that this rel is probably in */ \ 445 /* now try to find the closest symbol that this rel is probably in */ \
311 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 446 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
312 func = NULL; \ 447 func = NULL; \
313 offset_tmp = 0; \ 448 offset_tmp = 0; \
317 offset_tmp = EGET(sym->st_value); \ 452 offset_tmp = EGET(sym->st_value); \
318 } \ 453 } \
319 ++sym; \ 454 ++sym; \
320 } \ 455 } \
321 printf(" in "); \ 456 printf(" in "); \
322 if (func && func->st_name) \ 457 if (func && func->st_name) { \
323 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \ 458 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
459 if (r_offset > EGET(func->st_size)) \
460 printf("(optimized out: previous %s)", func_name); \
324 else \ 461 else \
325 printf("(NULL: fake?)"); \ 462 printf("%s", func_name); \
463 } else \
464 printf("(optimized out)"); \
326 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \ 465 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
466 if (be_verbose && has_objdump) { \
467 char *sysbuf; \
468 size_t syslen; \
469 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"; \
470 syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
471 sysbuf = xmalloc(syslen); \
472 if (sysbuf) { \
473 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
474 if (end_addr < r_offset) \
475 /* not uncommon when things are optimized out */ \
476 end_addr = r_offset + 0x100; \
477 snprintf(sysbuf, syslen, sysfmt, \
478 (unsigned long)offset_tmp, \
479 (unsigned long)end_addr, \
480 elf->filename, \
481 (unsigned long)r_offset); \
482 fflush(stdout); \
483 system(sysbuf); \
484 fflush(stdout); \
485 free(sysbuf); \
486 } \
487 } \
327 } \ 488 } \
328 } } 489 } }
329 SHOW_TEXTRELS(32) 490 SHOW_TEXTRELS(32)
330 SHOW_TEXTRELS(64) 491 SHOW_TEXTRELS(64)
331 } 492 }
333 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename); 494 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
334 495
335 return NULL; 496 return NULL;
336} 497}
337 498
338static void rpath_security_checks(elfobj *, char *); 499static void rpath_security_checks(elfobj *, char *, const char *);
339static void rpath_security_checks(elfobj *elf, char *item) { 500static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
501{
340 struct stat st; 502 struct stat st;
341 switch (*item) { 503 switch (*item) {
504 case '/': break;
342 case 0: 505 case '.':
343 warnf("Security problem NULL RPATH in %s", elf->filename); 506 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
344 break; 507 break;
345 case '/': break; 508 case ':':
509 case '\0':
510 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
511 break;
346 case '$': 512 case '$':
347 if (fstat(elf->fd, &st) != -1) 513 if (fstat(elf->fd, &st) != -1)
348 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID)) 514 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", 515 warnf("Security problem with %s='%s' in %s with mode set of %o",
350 item, elf->filename, st.st_mode & 07777); 516 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
351 break; 517 break;
352 default: 518 default:
353 warnf("Maybe? sec problem with RPATH='%s' in %s", item, elf->filename); 519 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
354 break; 520 break;
355 } 521 }
356} 522}
357static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len) 523static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
358{ 524{
394 /* Verify the memory is somewhat sane */ \ 560 /* Verify the memory is somewhat sane */ \
395 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 561 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
396 if (offset < (Elf ## B ## _Off)elf->len) { \ 562 if (offset < (Elf ## B ## _Off)elf->len) { \
397 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \ 563 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
398 *r = (char*)(elf->data + offset); \ 564 *r = (char*)(elf->data + offset); \
565 /* cache the length in case we need to nuke this section later on */ \
566 if (fix_elf) \
567 offset = strlen(*r); \
399 /* If quiet, don't output paths in ld.so.conf */ \ 568 /* If quiet, don't output paths in ld.so.conf */ \
400 if (be_quiet) { \ 569 if (be_quiet) { \
401 size_t len; \ 570 size_t len; \
402 char *start, *end; \ 571 char *start, *end; \
403 /* note that we only 'chop' off leading known paths. */ \ 572 /* note that we only 'chop' off leading known paths. */ \
404 /* since *r is read-only memory, we can only move the ptr forward. */ \ 573 /* since *r is read-only memory, we can only move the ptr forward. */ \
405 start = *r; \ 574 start = *r; \
406 /* scan each path in : delimited list */ \ 575 /* scan each path in : delimited list */ \
407 while (start) { \ 576 while (start) { \
408 rpath_security_checks(elf, start); \ 577 rpath_security_checks(elf, start, get_elfdtype(word)); \
409 end = strchr(start, ':'); \ 578 end = strchr(start, ':'); \
410 len = (end ? abs(end - start) : strlen(start)); \ 579 len = (end ? abs(end - start) : strlen(start)); \
580 if (use_ldcache) \
411 for (s = 0; ldpaths[s]; ++s) { \ 581 for (s = 0; ldpaths[s]; ++s) \
412 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \ 582 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
413 *r = (end ? end + 1 : NULL); \ 583 *r = end; \
584 /* corner case ... if RPATH reads "/usr/lib:", we want \
585 * to show ':' rather than '' */ \
586 if (end && end[1] != '\0') \
587 (*r)++; \
414 break; \ 588 break; \
415 } \ 589 } \
416 } \
417 if (!*r || !ldpaths[s] || !end) \ 590 if (!*r || !end) \
418 start = NULL; \ 591 break; \
419 else \ 592 else \
420 start = start + len + 1; \ 593 start = start + len + 1; \
421 } \ 594 } \
422 } \ 595 } \
596 if (*r) { \
597 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
598 /* just nuke it */ \
599 nuke_it##B: \
600 memset(*r, 0x00, offset); \
601 *r = NULL; \
602 ESET(dyn->d_tag, DT_DEBUG); \
603 ESET(dyn->d_un.d_ptr, 0); \
604 } else if (fix_elf) { \
605 /* try to clean "bad" paths */ \
606 size_t len, tmpdir_len; \
607 char *start, *end; \
608 const char *tmpdir; \
609 start = *r; \
610 tmpdir = (getenv("TMPDIR") ? : "."); \
611 tmpdir_len = strlen(tmpdir); \
612 while (1) { \
613 end = strchr(start, ':'); \
614 if (start == end) { \
615 eat_this_path##B: \
616 len = strlen(end); \
617 memmove(start, end+1, len); \
618 start[len-1] = '\0'; \
619 end = start - 1; \
620 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
621 if (!end) { \
622 if (start == *r) \
623 goto nuke_it##B; \
624 *--start = '\0'; \
625 } else \
626 goto eat_this_path##B; \
627 } \
628 if (!end) \
629 break; \
630 start = end + 1; \
631 } \
632 if (**r == '\0') \
633 goto nuke_it##B; \
634 } \
635 if (*r) \
423 if (*r) *found_rpath = 1; \ 636 *found_rpath = 1; \
637 } \
424 } \ 638 } \
425 ++dyn; \ 639 ++dyn; \
426 } \ 640 } \
427 } } 641 } }
428 SHOW_RPATH(32) 642 SHOW_RPATH(32)
445 } else if (rpath || runpath) 659 } else if (rpath || runpath)
446 xstrcat(ret, (runpath ? runpath : rpath), ret_len); 660 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
447 else if (!be_quiet) 661 else if (!be_quiet)
448 xstrcat(ret, " - ", ret_len); 662 xstrcat(ret, " - ", ret_len);
449} 663}
664
665#define LDSO_CACHE_MAGIC "ld.so-"
666#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
667#define LDSO_CACHE_VER "1.7.0"
668#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
669#define FLAG_ANY -1
670#define FLAG_TYPE_MASK 0x00ff
671#define FLAG_LIBC4 0x0000
672#define FLAG_ELF 0x0001
673#define FLAG_ELF_LIBC5 0x0002
674#define FLAG_ELF_LIBC6 0x0003
675#define FLAG_REQUIRED_MASK 0xff00
676#define FLAG_SPARC_LIB64 0x0100
677#define FLAG_IA64_LIB64 0x0200
678#define FLAG_X8664_LIB64 0x0300
679#define FLAG_S390_LIB64 0x0400
680#define FLAG_POWERPC_LIB64 0x0500
681#define FLAG_MIPS64_LIBN32 0x0600
682#define FLAG_MIPS64_LIBN64 0x0700
683
684static char *lookup_cache_lib(elfobj *, char *);
685
686#if defined(__GLIBC__) || defined(__UCLIBC__)
687
688static char *lookup_cache_lib(elfobj *elf, char *fname)
689{
690 int fd = 0;
691 char *strs;
692 static char buf[__PAX_UTILS_PATH_MAX] = "";
693 const char *cachefile = "/etc/ld.so.cache";
694 struct stat st;
695
696 typedef struct {
697 char magic[LDSO_CACHE_MAGIC_LEN];
698 char version[LDSO_CACHE_VER_LEN];
699 int nlibs;
700 } header_t;
701 header_t *header;
702
703 typedef struct {
704 int flags;
705 int sooffset;
706 int liboffset;
707 } libentry_t;
708 libentry_t *libent;
709
710 if (fname == NULL)
711 return NULL;
712
713 if (ldcache == 0) {
714 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1)
715 return NULL;
716
717 /* cache these values so we only map/unmap the cache file once */
718 ldcache_size = st.st_size;
719 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
720
721 close(fd);
722
723 if (ldcache == (caddr_t)-1) {
724 ldcache = 0;
725 return NULL;
726 }
727
728 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
729 return NULL;
730 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
731 return NULL;
732 }
733
734 header = (header_t *) ldcache;
735 libent = (libentry_t *) (ldcache + sizeof(header_t));
736 strs = (char *) &libent[header->nlibs];
737
738 for (fd = 0; fd < header->nlibs; fd++) {
739 /* this should be more fine grained, but for now we assume that
740 * diff arches will not be cached together. and we ignore the
741 * the different multilib mips cases. */
742 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
743 continue;
744 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
745 continue;
746
747 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
748 continue;
749 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
750 }
751 return buf;
752}
753#elif defined(__NetBSD__)
754static char *lookup_cache_lib(elfobj *elf, char *fname)
755{
756 static char buf[__PAX_UTILS_PATH_MAX] = "";
757 static struct stat st;
758
759 char **ldpath;
760 for (ldpath = ldpaths; *ldpath != NULL; ldpath++) {
761 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", *ldpath, fname) >= sizeof(buf))
762 continue; /* if the pathname is too long, or something went wrong, ignore */
763
764 if (stat(buf, &st) != 0)
765 continue; /* if the lib doesn't exist in *ldpath, look further */
766
767 /* NetBSD doesn't actually do sanity checks, it just loads the file
768 * and if that doesn't work, continues looking in other directories.
769 * This cannot easily be safely emulated, unfortunately. For now,
770 * just assume that if it exists, it's a valid library. */
771
772 return buf;
773 }
774
775 /* not found in any path */
776 return NULL;
777}
778#else
779#warning Cache support not implemented for your target
780static char *lookup_cache_lib(elfobj *elf, char *fname)
781{
782 return NULL;
783}
784#endif
785
450static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len) 786static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
451{ 787{
452 unsigned long i; 788 unsigned long i;
453 char *needed; 789 char *needed;
454 void *strtbl_void; 790 void *strtbl_void;
791 char *p;
455 792
456 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL; 793 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
457 794
458 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 795 strtbl_void = elf_findsecbyname(elf, ".dynstr");
459 796
479 } \ 816 } \
480 needed = (char*)(elf->data + offset); \ 817 needed = (char*)(elf->data + offset); \
481 if (op == 0) { \ 818 if (op == 0) { \
482 if (!be_wewy_wewy_quiet) { \ 819 if (!be_wewy_wewy_quiet) { \
483 if (*found_needed) xchrcat(ret, ',', ret_len); \ 820 if (*found_needed) xchrcat(ret, ',', ret_len); \
821 if (use_ldcache) \
822 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
823 needed = p; \
484 xstrcat(ret, needed, ret_len); \ 824 xstrcat(ret, needed, ret_len); \
485 } \ 825 } \
486 *found_needed = 1; \ 826 *found_needed = 1; \
487 } else { \ 827 } else { \
488 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \ 828 if (!strncmp(find_lib, needed, strlen( !g_match ? needed : find_lib))) { \
489 *found_lib = 1; \ 829 *found_lib = 1; \
490 return (be_wewy_wewy_quiet ? NULL : needed); \ 830 return (be_wewy_wewy_quiet ? NULL : needed); \
491 } \ 831 } \
492 } \ 832 } \
493 } \ 833 } \
524} 864}
525static char *scanelf_file_bind(elfobj *elf, char *found_bind) 865static char *scanelf_file_bind(elfobj *elf, char *found_bind)
526{ 866{
527 unsigned long i; 867 unsigned long i;
528 struct stat s; 868 struct stat s;
869 char dynamic = 0;
529 870
530 if (!show_bind) return NULL; 871 if (!show_bind) return NULL;
531 if (!elf->phdr) return NULL; 872 if (!elf->phdr) return NULL;
532 873
533#define SHOW_BIND(B) \ 874#define SHOW_BIND(B) \
536 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 877 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
537 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 878 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
538 Elf ## B ## _Off offset; \ 879 Elf ## B ## _Off offset; \
539 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 880 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
540 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 881 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
882 dynamic = 1; \
541 offset = EGET(phdr[i].p_offset); \ 883 offset = EGET(phdr[i].p_offset); \
542 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 884 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
543 dyn = DYN ## B (elf->data + offset); \ 885 dyn = DYN ## B (elf->data + offset); \
544 while (EGET(dyn->d_tag) != DT_NULL) { \ 886 while (EGET(dyn->d_tag) != DT_NULL) { \
545 if (EGET(dyn->d_tag) == DT_BIND_NOW || \ 887 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
556 SHOW_BIND(32) 898 SHOW_BIND(32)
557 SHOW_BIND(64) 899 SHOW_BIND(64)
558 900
559 if (be_wewy_wewy_quiet) return NULL; 901 if (be_wewy_wewy_quiet) return NULL;
560 902
903 /* 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)) { 904 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
562 return NULL; 905 return NULL;
563 } else { 906 } else {
564 *found_bind = 1; 907 *found_bind = 1;
565 return (char *) "LAZY"; 908 return (char *) (dynamic ? "LAZY" : "STATIC");
566 } 909 }
567} 910}
568static char *scanelf_file_soname(elfobj *elf, char *found_soname) 911static char *scanelf_file_soname(elfobj *elf, char *found_soname)
569{ 912{
570 unsigned long i; 913 unsigned long i;
609 SHOW_SONAME(64) 952 SHOW_SONAME(64)
610 } 953 }
611 954
612 return NULL; 955 return NULL;
613} 956}
957
614static char *scanelf_file_sym(elfobj *elf, char *found_sym) 958static char *scanelf_file_sym(elfobj *elf, char *found_sym)
615{ 959{
616 unsigned long i; 960 unsigned long i;
961 char *ret;
617 void *symtab_void, *strtab_void; 962 void *symtab_void, *strtab_void;
618 963
619 if (!find_sym) return NULL; 964 if (!find_sym) return NULL;
965 ret = find_sym;
620 966
621 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void); 967 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
622 968
623 if (symtab_void && strtab_void) { 969 if (symtab_void && strtab_void) {
624#define FIND_SYM(B) \ 970#define FIND_SYM(B) \
625 if (elf->elf_class == ELFCLASS ## B) { \ 971 if (elf->elf_class == ELFCLASS ## B) { \
626 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 972 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
627 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 973 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
628 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 974 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
629 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 975 unsigned long cnt = EGET(symtab->sh_entsize); \
630 char *symname; \ 976 char *symname; \
977 if (cnt) \
978 cnt = EGET(symtab->sh_size) / cnt; \
631 for (i = 0; i < cnt; ++i) { \ 979 for (i = 0; i < cnt; ++i) { \
632 if (sym->st_name) { \ 980 if (sym->st_name) { \
981 /* make sure the symbol name is in acceptable memory range */ \
633 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 982 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
634 if (*find_sym == '*') { \ 983 if ((void*)symname > (void*)elf->data_end) { \
984 warnf("%s: corrupt ELF symbols", elf->filename); \
985 ++sym; \
986 continue; \
987 } \
988 /* debug display ... show all symbols and some extra info */ \
989 if (g_match ? rematch(ret, symname, REG_EXTENDED) == 0 : *ret == '*') { \
635 printf("%s(%s) %5lX %15s %s\n", \ 990 printf("%s(%s) %5lX %15s %s %s\n", \
636 ((*found_sym == 0) ? "\n\t" : "\t"), \ 991 ((*found_sym == 0) ? "\n\t" : "\t"), \
637 elf->base_filename, \ 992 elf->base_filename, \
638 (long)sym->st_size, \ 993 (unsigned long)sym->st_size, \
639 (char *)get_elfstttype(sym->st_info), \ 994 get_elfstttype(sym->st_info), \
640 symname); \ 995 sym->st_shndx == SHN_UNDEF ? "U" : "D", symname); \
641 *found_sym = 1; \ 996 *found_sym = 1; \
642 } else if ((strcmp(find_sym, symname) == 0) || \ 997 } else { \
643 (strcmp(symname, versioned_symname) == 0)) \ 998 /* allow the user to specify a comma delimited list of symbols to search for */ \
999 char *this_sym, *this_sym_ver, *next_sym; \
1000 this_sym = ret; \
1001 this_sym_ver = versioned_symname; \
1002 do { \
1003 next_sym = strchr(this_sym, ','); \
1004 if (next_sym == NULL) \
1005 next_sym = this_sym + strlen(this_sym); \
1006 /* do we want a defined symbol ? */ \
1007 if (*this_sym == '+') { \
1008 if (sym->st_shndx == SHN_UNDEF) \
1009 goto skip_this_sym##B; \
1010 ++this_sym; \
1011 ++this_sym_ver; \
1012 /* do we want an undefined symbol ? */ \
1013 } else if (*this_sym == '-') { \
1014 if (sym->st_shndx != SHN_UNDEF) \
1015 goto skip_this_sym##B; \
1016 ++this_sym; \
1017 ++this_sym_ver; \
1018 } \
1019 /* ok, lets compare the name now */ \
1020 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
1021 (strncmp(this_sym_ver, symname, strlen(this_sym_ver)) == 0)) { \
1022 if (be_semi_verbose) { \
1023 char buf[126]; \
1024 snprintf(buf, sizeof(buf), "%lX %s %s", \
1025 (unsigned long)sym->st_size, get_elfstttype(sym->st_info), this_sym); \
1026 ret = buf; \
1027 } else \
1028 ret = this_sym; \
644 (*found_sym)++; \ 1029 (*found_sym)++; \
1030 goto break_out; \
1031 } \
1032 skip_this_sym##B: this_sym = next_sym + 1; \
1033 } while (*next_sym != '\0'); \
1034 } \
645 } \ 1035 } \
646 ++sym; \ 1036 ++sym; \
647 } } 1037 } }
648 FIND_SYM(32) 1038 FIND_SYM(32)
649 FIND_SYM(64) 1039 FIND_SYM(64)
650 } 1040 }
651 1041
1042break_out:
652 if (be_wewy_wewy_quiet) return NULL; 1043 if (be_wewy_wewy_quiet) return NULL;
653 1044
654 if (*find_sym != '*' && *found_sym) 1045 if (*find_sym != '*' && *found_sym)
655 return find_sym; 1046 return ret;
656 if (be_quiet) 1047 if (be_quiet)
657 return NULL; 1048 return NULL;
658 else 1049 else
659 return (char *)" - "; 1050 return (char *)" - ";
660} 1051}
1052
1053
1054static char *scanelf_file_sections(elfobj *elf, char *found_section)
1055{
1056 if (!find_section)
1057 return NULL;
1058
1059#define FIND_SECTION(B) \
1060 if (elf->elf_class == ELFCLASS ## B) { \
1061 int invert; \
1062 Elf ## B ## _Shdr *section; \
1063 invert = (*find_section == '!' ? 1 : 0); \
1064 section = SHDR ## B (elf_findsecbyname(elf, find_section+invert)); \
1065 if ((section == NULL && invert) || (section != NULL && !invert)) \
1066 *found_section = 1; \
1067 }
1068 FIND_SECTION(32)
1069 FIND_SECTION(64)
1070
1071 if (be_wewy_wewy_quiet)
1072 return NULL;
1073
1074 if (*found_section)
1075 return find_section;
1076
1077 if (be_quiet)
1078 return NULL;
1079 else
1080 return (char *)" - ";
1081}
1082
661/* scan an elf file and show all the fun stuff */ 1083/* scan an elf file and show all the fun stuff */
662#define prints(str) write(fileno(stdout), str, strlen(str)) 1084#define prints(str) write(fileno(stdout), str, strlen(str))
663static void scanelf_file(const char *filename) 1085static int scanelf_elfobj(elfobj *elf)
664{ 1086{
665 unsigned long i; 1087 unsigned long i;
666 char found_pax, found_phdr, found_relro, found_load, found_textrel, 1088 char found_pax, found_phdr, found_relro, found_load, found_textrel,
667 found_rpath, found_needed, found_interp, found_bind, found_soname, 1089 found_rpath, found_needed, found_interp, found_bind, found_soname,
668 found_sym, found_lib, found_file, found_textrels; 1090 found_sym, found_lib, found_file, found_textrels, found_section;
669 elfobj *elf;
670 struct stat st;
671 static char *out_buffer = NULL; 1091 static char *out_buffer = NULL;
672 static size_t out_len; 1092 static size_t out_len;
673 1093
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 = \ 1094 found_pax = found_phdr = found_relro = found_load = found_textrel = \
690 found_rpath = found_needed = found_interp = found_bind = found_soname = \ 1095 found_rpath = found_needed = found_interp = found_bind = found_soname = \
691 found_sym = found_lib = found_file = found_textrels = 0; 1096 found_sym = found_lib = found_file = found_textrels = found_section = 0;
692 1097
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) 1098 if (be_verbose > 2)
700 printf("%s: scanning file {%s,%s}\n", filename, 1099 printf("%s: scanning file {%s,%s}\n", elf->filename,
701 get_elfeitype(EI_CLASS, elf->elf_class), 1100 get_elfeitype(EI_CLASS, elf->elf_class),
702 get_elfeitype(EI_DATA, elf->data[EI_DATA])); 1101 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
703 else if (be_verbose) 1102 else if (be_verbose > 1)
704 printf("%s: scanning file\n", filename); 1103 printf("%s: scanning file\n", elf->filename);
705 1104
706 /* init output buffer */ 1105 /* init output buffer */
707 if (!out_buffer) { 1106 if (!out_buffer) {
708 out_len = sizeof(char) * 80; 1107 out_len = sizeof(char) * 80;
709 out_buffer = (char*)xmalloc(out_len); 1108 out_buffer = (char*)xmalloc(out_len);
714 if (!be_quiet && show_banner) { 1113 if (!be_quiet && show_banner) {
715 for (i = 0; out_format[i]; ++i) { 1114 for (i = 0; out_format[i]; ++i) {
716 if (!IS_MODIFIER(out_format[i])) continue; 1115 if (!IS_MODIFIER(out_format[i])) continue;
717 1116
718 switch (out_format[++i]) { 1117 switch (out_format[++i]) {
1118 case '+': break;
719 case '%': break; 1119 case '%': break;
720 case '#': break; 1120 case '#': break;
721 case 'F': 1121 case 'F':
722 case 'p': 1122 case 'p':
723 case 'f': prints("FILE "); found_file = 1; break; 1123 case 'f': prints("FILE "); found_file = 1; break;
724 case 'o': prints(" TYPE "); break; 1124 case 'o': prints(" TYPE "); break;
725 case 'x': prints(" PAX "); break; 1125 case 'x': prints(" PAX "); break;
726 case 'e': prints("STK/REL/PTL "); break; 1126 case 'e': prints("STK/REL/PTL "); break;
727 case 't': prints("TEXTREL "); break; 1127 case 't': prints("TEXTREL "); break;
728 case 'r': prints("RPATH "); break; 1128 case 'r': prints("RPATH "); break;
1129 case 'M': prints("CLASS "); break;
729 case 'n': prints("NEEDED "); break; 1130 case 'n': prints("NEEDED "); break;
730 case 'i': prints("INTERP "); break; 1131 case 'i': prints("INTERP "); break;
731 case 'b': prints("BIND "); break; 1132 case 'b': prints("BIND "); break;
732 case 'S': prints("SONAME "); break; 1133 case 'S': prints("SONAME "); break;
733 case 's': prints("SYM "); break; 1134 case 's': prints("SYM "); break;
734 case 'N': prints("LIB "); break; 1135 case 'N': prints("LIB "); break;
735 case 'T': prints("TEXTRELS "); break; 1136 case 'T': prints("TEXTRELS "); break;
1137 case 'k': prints("SECTION "); break;
1138 case 'a': prints("ARCH "); break;
736 default: warnf("'%c' has no title ?", out_format[i]); 1139 default: warnf("'%c' has no title ?", out_format[i]);
737 } 1140 }
738 } 1141 }
739 if (!found_file) prints("FILE "); 1142 if (!found_file) prints("FILE ");
740 prints("\n"); 1143 prints("\n");
745 /* dump all the good stuff */ 1148 /* dump all the good stuff */
746 for (i = 0; out_format[i]; ++i) { 1149 for (i = 0; out_format[i]; ++i) {
747 const char *out; 1150 const char *out;
748 const char *tmp; 1151 const char *tmp;
749 1152
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])) { 1153 if (!IS_MODIFIER(out_format[i])) {
755 xchrcat(&out_buffer, out_format[i], &out_len); 1154 xchrcat(&out_buffer, out_format[i], &out_len);
756 continue; 1155 continue;
757 } 1156 }
758 1157
759 out = NULL; 1158 out = NULL;
760 be_wewy_wewy_quiet = (out_format[i] == '#'); 1159 be_wewy_wewy_quiet = (out_format[i] == '#');
1160 be_semi_verbose = (out_format[i] == '+');
761 switch (out_format[++i]) { 1161 switch (out_format[++i]) {
1162 case '+':
762 case '%': 1163 case '%':
763 case '#': 1164 case '#':
764 xchrcat(&out_buffer, out_format[i], &out_len); break; 1165 xchrcat(&out_buffer, out_format[i], &out_len); break;
765 case 'F': 1166 case 'F':
766 found_file = 1; 1167 found_file = 1;
767 if (be_wewy_wewy_quiet) break; 1168 if (be_wewy_wewy_quiet) break;
768 xstrcat(&out_buffer, filename, &out_len); 1169 xstrcat(&out_buffer, elf->filename, &out_len);
769 break; 1170 break;
770 case 'p': 1171 case 'p':
771 found_file = 1; 1172 found_file = 1;
772 if (be_wewy_wewy_quiet) break; 1173 if (be_wewy_wewy_quiet) break;
773 tmp = filename; 1174 tmp = elf->filename;
774 if (search_path) { 1175 if (search_path) {
775 ssize_t len_search = strlen(search_path); 1176 ssize_t len_search = strlen(search_path);
776 ssize_t len_file = strlen(filename); 1177 ssize_t len_file = strlen(elf->filename);
777 if (!strncmp(filename, search_path, len_search) && \ 1178 if (!strncmp(elf->filename, search_path, len_search) && \
778 len_file > len_search) 1179 len_file > len_search)
779 tmp += len_search; 1180 tmp += len_search;
780 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++; 1181 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
781 } 1182 }
782 xstrcat(&out_buffer, tmp, &out_len); 1183 xstrcat(&out_buffer, tmp, &out_len);
783 break; 1184 break;
784 case 'f': 1185 case 'f':
785 found_file = 1; 1186 found_file = 1;
786 if (be_wewy_wewy_quiet) break; 1187 if (be_wewy_wewy_quiet) break;
787 tmp = strrchr(filename, '/'); 1188 tmp = strrchr(elf->filename, '/');
788 tmp = (tmp == NULL ? filename : tmp+1); 1189 tmp = (tmp == NULL ? elf->filename : tmp+1);
789 xstrcat(&out_buffer, tmp, &out_len); 1190 xstrcat(&out_buffer, tmp, &out_len);
790 break; 1191 break;
791 case 'o': out = get_elfetype(elf); break; 1192 case 'o': out = get_elfetype(elf); break;
792 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1193 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; 1194 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; 1195 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
795 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break; 1196 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; 1197 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1198 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
797 case 'n': 1199 case 'n':
798 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break; 1200 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; 1201 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
800 case 'b': out = scanelf_file_bind(elf, &found_bind); break; 1202 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
801 case 'S': out = scanelf_file_soname(elf, &found_soname); break; 1203 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
802 case 's': out = scanelf_file_sym(elf, &found_sym); break; 1204 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1205 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1206 case 'a': out = get_elfemtype(elf); break;
803 default: warnf("'%c' has no scan code?", out_format[i]); 1207 default: warnf("'%c' has no scan code?", out_format[i]);
804 } 1208 }
1209 if (out) {
1210 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
1211 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
1212 xstrncat(&out_buffer, out, &out_len, (tmp-out));
1213 else
805 if (out) xstrcat(&out_buffer, out, &out_len); 1214 xstrcat(&out_buffer, out, &out_len);
1215 }
806 } 1216 }
807 1217
808#define FOUND_SOMETHING() \ 1218#define FOUND_SOMETHING() \
809 (found_pax || found_phdr || found_relro || found_load || found_textrel || \ 1219 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
810 found_rpath || found_needed || found_interp || found_bind || \ 1220 found_rpath || found_needed || found_interp || found_bind || \
811 found_soname || found_sym || found_lib || found_textrels) 1221 found_soname || found_sym || found_lib || found_textrels || found_section )
812 1222
813 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) { 1223 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
814 xchrcat(&out_buffer, ' ', &out_len); 1224 xchrcat(&out_buffer, ' ', &out_len);
815 xstrcat(&out_buffer, filename, &out_len); 1225 xstrcat(&out_buffer, elf->filename, &out_len);
816 } 1226 }
817 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) { 1227 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
818 puts(out_buffer); 1228 puts(out_buffer);
819 fflush(stdout); 1229 fflush(stdout);
820 } 1230 }
821 1231
1232 return 0;
1233}
1234
1235/* scan a single elf */
1236static int scanelf_elf(const char *filename, int fd, size_t len)
1237{
1238 int ret = 1;
1239 elfobj *elf;
1240
1241 /* verify this is real ELF */
1242 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1243 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1244 return ret;
1245 }
1246 switch (match_bits) {
1247 case 32:
1248 if (elf->elf_class != ELFCLASS32)
1249 goto label_done;
1250 break;
1251 case 64:
1252 if (elf->elf_class != ELFCLASS64)
1253 goto label_done;
1254 break;
1255 default: break;
1256 }
1257 if (strlen(match_etypes)) {
1258 char sbuf[126];
1259 strncpy(sbuf, match_etypes, sizeof(sbuf));
1260 if (strchr(match_etypes, ',') != NULL) {
1261 char *p;
1262 while((p = strrchr(sbuf, ',')) != NULL) {
1263 *p = 0;
1264 if (etype_lookup(p+1) == get_etype(elf))
1265 goto label_ret;
1266 }
1267 }
1268 if (etype_lookup(sbuf) != get_etype(elf))
1269 goto label_done;
1270 }
1271
1272label_ret:
1273 ret = scanelf_elfobj(elf);
1274
1275label_done:
822 unreadelf(elf); 1276 unreadelf(elf);
1277 return ret;
1278}
1279
1280/* scan an archive of elfs */
1281static int scanelf_archive(const char *filename, int fd, size_t len)
1282{
1283 archive_handle *ar;
1284 archive_member *m;
1285 char *ar_buffer;
1286 elfobj *elf;
1287
1288 ar = ar_open_fd(filename, fd);
1289 if (ar == NULL)
1290 return 1;
1291
1292 ar_buffer = (char*)mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1293 while ((m=ar_next(ar)) != NULL) {
1294 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size);
1295 if (elf) {
1296 scanelf_elfobj(elf);
1297 unreadelf(elf);
1298 }
1299 }
1300 munmap(ar_buffer, len);
1301
1302 return 0;
1303}
1304/* scan a file which may be an elf or an archive or some other magical beast */
1305static int scanelf_file(const char *filename, const struct stat *st_cache)
1306{
1307 const struct stat *st = st_cache;
1308 struct stat symlink_st;
1309 int fd;
1310
1311 /* always handle regular files and handle symlinked files if no -y */
1312 if (S_ISLNK(st->st_mode)) {
1313 if (!scan_symlink) return 1;
1314 stat(filename, &symlink_st);
1315 st = &symlink_st;
1316 }
1317
1318 if (!S_ISREG(st->st_mode)) {
1319 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1320 return 1;
1321 }
1322
1323 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1324 return 1;
1325
1326 if (scanelf_elf(filename, fd, st->st_size) == 1 && scan_archives)
1327 /* if it isn't an ELF, maybe it's an .a archive */
1328 scanelf_archive(filename, fd, st->st_size);
1329
1330 close(fd);
1331 return 0;
823} 1332}
824 1333
825/* scan a directory for ET_EXEC files and print when we find one */ 1334/* scan a directory for ET_EXEC files and print when we find one */
826static void scanelf_dir(const char *path) 1335static int scanelf_dir(const char *path)
827{ 1336{
828 register DIR *dir; 1337 register DIR *dir;
829 register struct dirent *dentry; 1338 register struct dirent *dentry;
830 struct stat st_top, st; 1339 struct stat st_top, st;
831 char buf[_POSIX_PATH_MAX]; 1340 char buf[__PAX_UTILS_PATH_MAX];
832 size_t pathlen = 0, len = 0; 1341 size_t pathlen = 0, len = 0;
1342 int ret = 0;
833 1343
834 /* make sure path exists */ 1344 /* make sure path exists */
835 if (lstat(path, &st_top) == -1) { 1345 if (lstat(path, &st_top) == -1) {
836 if (be_verbose > 2) printf("%s: does not exist\n", path); 1346 if (be_verbose > 2) printf("%s: does not exist\n", path);
837 return; 1347 return 1;
838 } 1348 }
839 1349
840 /* ok, if it isn't a directory, assume we can open it */ 1350 /* ok, if it isn't a directory, assume we can open it */
841 if (!S_ISDIR(st_top.st_mode)) { 1351 if (!S_ISDIR(st_top.st_mode)) {
842 scanelf_file(path); 1352 return scanelf_file(path, &st_top);
843 return;
844 } 1353 }
845 1354
846 /* now scan the dir looking for fun stuff */ 1355 /* now scan the dir looking for fun stuff */
847 if ((dir = opendir(path)) == NULL) { 1356 if ((dir = opendir(path)) == NULL) {
848 warnf("could not opendir %s: %s", path, strerror(errno)); 1357 warnf("could not opendir %s: %s", path, strerror(errno));
849 return; 1358 return 1;
850 } 1359 }
851 if (be_verbose) printf("%s: scanning dir\n", path); 1360 if (be_verbose > 1) printf("%s: scanning dir\n", path);
852 1361
853 pathlen = strlen(path); 1362 pathlen = strlen(path);
854 while ((dentry = readdir(dir))) { 1363 while ((dentry = readdir(dir))) {
855 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1364 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
856 continue; 1365 continue;
858 if (len >= sizeof(buf)) { 1367 if (len >= sizeof(buf)) {
859 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path, 1368 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
860 (unsigned long)len, (unsigned long)sizeof(buf)); 1369 (unsigned long)len, (unsigned long)sizeof(buf));
861 continue; 1370 continue;
862 } 1371 }
863 sprintf(buf, "%s/%s", path, dentry->d_name); 1372 snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name);
864 if (lstat(buf, &st) != -1) { 1373 if (lstat(buf, &st) != -1) {
865 if (S_ISREG(st.st_mode)) 1374 if (S_ISREG(st.st_mode))
866 scanelf_file(buf); 1375 ret = scanelf_file(buf, &st);
867 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1376 else if (dir_recurse && S_ISDIR(st.st_mode)) {
868 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1377 if (dir_crossmount || (st_top.st_dev == st.st_dev))
869 scanelf_dir(buf); 1378 ret = scanelf_dir(buf);
870 } 1379 }
871 } 1380 }
872 } 1381 }
873 closedir(dir); 1382 closedir(dir);
1383 return ret;
874} 1384}
875 1385
876static int scanelf_from_file(char *filename) 1386static int scanelf_from_file(const char *filename)
877{ 1387{
878 FILE *fp = NULL; 1388 FILE *fp = NULL;
879 char *p; 1389 char *p;
880 char path[_POSIX_PATH_MAX]; 1390 char path[__PAX_UTILS_PATH_MAX];
1391 int ret = 0;
881 1392
882 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL)) 1393 if (strcmp(filename, "-") == 0)
883 fp = stdin; 1394 fp = stdin;
884 else if ((fp = fopen(filename, "r")) == NULL) 1395 else if ((fp = fopen(filename, "r")) == NULL)
885 return 1; 1396 return 1;
886 1397
887 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1398 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
888 if ((p = strchr(path, '\n')) != NULL) 1399 if ((p = strchr(path, '\n')) != NULL)
889 *p = 0; 1400 *p = 0;
890 search_path = path; 1401 search_path = path;
891 scanelf_dir(path); 1402 ret = scanelf_dir(path);
892 } 1403 }
893 if (fp != stdin) 1404 if (fp != stdin)
894 fclose(fp); 1405 fclose(fp);
895 return 0; 1406 return ret;
896} 1407}
897 1408
898static void load_ld_so_conf() 1409#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1410
1411static int load_ld_cache_config(int i, const char *fname)
899{ 1412{
900 FILE *fp = NULL; 1413 FILE *fp = NULL;
901 char *p; 1414 char *p;
902 char path[_POSIX_PATH_MAX]; 1415 char path[__PAX_UTILS_PATH_MAX];
903 int i = 0;
904 1416
905 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1417 if (i + 1 == ARRAY_SIZE(ldpaths))
906 return; 1418 return i;
907 1419
1420 if ((fp = fopen(fname, "r")) == NULL)
1421 return i;
1422
908 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1423 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
909 if (*path != '/')
910 continue;
911
912 if ((p = strrchr(path, '\r')) != NULL) 1424 if ((p = strrchr(path, '\r')) != NULL)
913 *p = 0; 1425 *p = 0;
914 if ((p = strchr(path, '\n')) != NULL) 1426 if ((p = strchr(path, '\n')) != NULL)
915 *p = 0; 1427 *p = 0;
1428#ifdef __linux__
1429 // recursive includes of the same file will make this segfault.
1430 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1431 glob64_t gl;
1432 size_t x;
1433 char gpath[__PAX_UTILS_PATH_MAX];
1434
1435 memset(gpath, 0, sizeof(gpath));
1436
1437 if (path[8] != '/')
1438 snprintf(gpath, sizeof(gpath), "/etc/%s", &path[8]);
1439 else
1440 strncpy(gpath, &path[8], sizeof(gpath));
1441
1442 if ((glob64(gpath, 0, NULL, &gl)) == 0) {
1443 for (x = 0; x < gl.gl_pathc; ++x) {
1444 /* try to avoid direct loops */
1445 if (strcmp(gl.gl_pathv[x], fname) == 0)
1446 continue;
1447 i = load_ld_cache_config(i, gl.gl_pathv[x]);
1448 if (i + 1 >= ARRAY_SIZE(ldpaths)) {
1449 globfree64(&gl);
1450 return i;
1451 }
1452 }
1453 globfree64 (&gl);
1454 continue;
1455 }
1456 }
1457#endif
1458 if (*path != '/')
1459 continue;
916 1460
917 ldpaths[i++] = xstrdup(path); 1461 ldpaths[i++] = xstrdup(path);
918 1462
919 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths)) 1463 if (i + 1 == ARRAY_SIZE(ldpaths))
920 break; 1464 break;
921 } 1465 }
922 ldpaths[i] = NULL; 1466 ldpaths[i] = NULL;
923 1467
924 fclose(fp); 1468 fclose(fp);
1469 return i;
925} 1470}
1471
1472#elif defined(__FreeBSD__) || (__DragonFly__)
1473
1474static int load_ld_cache_config(int i, const char *fname)
1475{
1476 FILE *fp = NULL;
1477 char *b = NULL, *p;
1478 struct elfhints_hdr hdr;
1479
1480 if (i + 1 == ARRAY_SIZE(ldpaths))
1481 return i;
1482
1483 if ((fp = fopen(fname, "r")) == NULL)
1484 return i;
1485
1486 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1487 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1488 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1489 {
1490 fclose(fp);
1491 return i;
1492 }
1493
1494 b = (char*)malloc(hdr.dirlistlen+1);
1495 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1496 fclose(fp);
1497 free(b);
1498 return i;
1499 }
1500
1501 while ((p = strsep(&b, ":"))) {
1502 if (*p == '\0') continue;
1503 ldpaths[i++] = xstrdup(p);
1504
1505 if (i + 1 == ARRAY_SIZE(ldpaths))
1506 break;
1507 }
1508 ldpaths[i] = NULL;
1509
1510 free(b);
1511 fclose(fp);
1512 return i;
1513}
1514
1515#else
1516
1517#warning Cache config support not implemented for your target
1518static int load_ld_cache_config(int i, const char *fname)
1519{
1520 memset(ldpaths, 0x00, sizeof(ldpaths));
1521}
1522
1523#endif
926 1524
927/* scan /etc/ld.so.conf for paths */ 1525/* scan /etc/ld.so.conf for paths */
928static void scanelf_ldpath() 1526static void scanelf_ldpath()
929{ 1527{
930 char scan_l, scan_ul, scan_ull; 1528 char scan_l, scan_ul, scan_ull;
964 } 1562 }
965 1563
966 free(path); 1564 free(path);
967} 1565}
968 1566
969
970
971/* usage / invocation handling functions */ 1567/* usage / invocation handling functions */
972#define PARSE_FLAGS "plRmyxetrnibSs:gN:TaqvF:f:o:BhV" 1568#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:BhV"
973#define a_argument required_argument 1569#define a_argument required_argument
974static struct option const long_opts[] = { 1570static struct option const long_opts[] = {
975 {"path", no_argument, NULL, 'p'}, 1571 {"path", no_argument, NULL, 'p'},
976 {"ldpath", no_argument, NULL, 'l'}, 1572 {"ldpath", no_argument, NULL, 'l'},
977 {"recursive", no_argument, NULL, 'R'}, 1573 {"recursive", no_argument, NULL, 'R'},
978 {"mount", no_argument, NULL, 'm'}, 1574 {"mount", no_argument, NULL, 'm'},
979 {"symlink", no_argument, NULL, 'y'}, 1575 {"symlink", no_argument, NULL, 'y'},
1576 {"archives", no_argument, NULL, 'A'},
1577 {"ldcache", no_argument, NULL, 'L'},
1578 {"fix", no_argument, NULL, 'X'},
1579 {"setpax", a_argument, NULL, 'z'},
980 {"pax", no_argument, NULL, 'x'}, 1580 {"pax", no_argument, NULL, 'x'},
981 {"header", no_argument, NULL, 'e'}, 1581 {"header", no_argument, NULL, 'e'},
982 {"textrel", no_argument, NULL, 't'}, 1582 {"textrel", no_argument, NULL, 't'},
983 {"rpath", no_argument, NULL, 'r'}, 1583 {"rpath", no_argument, NULL, 'r'},
984 {"needed", no_argument, NULL, 'n'}, 1584 {"needed", no_argument, NULL, 'n'},
985 {"interp", no_argument, NULL, 'i'}, 1585 {"interp", no_argument, NULL, 'i'},
986 {"bind", no_argument, NULL, 'b'}, 1586 {"bind", no_argument, NULL, 'b'},
987 {"soname", no_argument, NULL, 'S'}, 1587 {"soname", no_argument, NULL, 'S'},
988 {"symbol", a_argument, NULL, 's'}, 1588 {"symbol", a_argument, NULL, 's'},
1589 {"section", a_argument, NULL, 'k'},
989 {"lib", a_argument, NULL, 'N'}, 1590 {"lib", a_argument, NULL, 'N'},
990 {"gmatch", no_argument, NULL, 'g'}, 1591 {"gmatch", no_argument, NULL, 'g'},
991 {"textrels", no_argument, NULL, 'T'}, 1592 {"textrels", no_argument, NULL, 'T'},
1593 {"etype", a_argument, NULL, 'E'},
1594 {"bits", a_argument, NULL, 'M'},
992 {"all", no_argument, NULL, 'a'}, 1595 {"all", no_argument, NULL, 'a'},
993 {"quiet", no_argument, NULL, 'q'}, 1596 {"quiet", no_argument, NULL, 'q'},
994 {"verbose", no_argument, NULL, 'v'}, 1597 {"verbose", no_argument, NULL, 'v'},
995 {"format", a_argument, NULL, 'F'}, 1598 {"format", a_argument, NULL, 'F'},
996 {"from", a_argument, NULL, 'f'}, 1599 {"from", a_argument, NULL, 'f'},
1004static const char *opts_help[] = { 1607static const char *opts_help[] = {
1005 "Scan all directories in PATH environment", 1608 "Scan all directories in PATH environment",
1006 "Scan all directories in /etc/ld.so.conf", 1609 "Scan all directories in /etc/ld.so.conf",
1007 "Scan directories recursively", 1610 "Scan directories recursively",
1008 "Don't recursively cross mount points", 1611 "Don't recursively cross mount points",
1009 "Don't scan symlinks\n", 1612 "Don't scan symlinks",
1613 "Scan archives (.a files)",
1614 "Utilize ld.so.cache information (use with -r/-n)",
1615 "Try and 'fix' bad things (use with -r/-e)",
1616 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1010 "Print PaX markings", 1617 "Print PaX markings",
1011 "Print GNU_STACK/PT_LOAD markings", 1618 "Print GNU_STACK/PT_LOAD markings",
1012 "Print TEXTREL information", 1619 "Print TEXTREL information",
1013 "Print RPATH information", 1620 "Print RPATH information",
1014 "Print NEEDED information", 1621 "Print NEEDED information",
1015 "Print INTERP information", 1622 "Print INTERP information",
1016 "Print BIND information", 1623 "Print BIND information",
1017 "Print SONAME information", 1624 "Print SONAME information",
1018 "Find a specified symbol", 1625 "Find a specified symbol",
1626 "Find a specified section",
1019 "Find a specified library", 1627 "Find a specified library",
1020 "Use strncmp to match libraries. (use with -N)", 1628 "Use strncmp to match libraries. (use with -N)",
1021 "Locate cause of TEXTREL", 1629 "Locate cause of TEXTREL",
1630 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1631 "Print only ELF files matching numeric bits",
1022 "Print all scanned info (-x -e -t -r -b)\n", 1632 "Print all scanned info (-x -e -t -r -b)\n",
1023 "Only output 'bad' things", 1633 "Only output 'bad' things",
1024 "Be verbose (can be specified more than once)", 1634 "Be verbose (can be specified more than once)",
1025 "Use specified format for output", 1635 "Use specified format for output",
1026 "Read input stream from a filename", 1636 "Read input stream from a filename",
1034/* display usage and exit */ 1644/* display usage and exit */
1035static void usage(int status) 1645static void usage(int status)
1036{ 1646{
1037 unsigned long i; 1647 unsigned long i;
1038 printf("* Scan ELF binaries for stuff\n\n" 1648 printf("* Scan ELF binaries for stuff\n\n"
1039 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0); 1649 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1040 printf("Options: -[%s]\n", PARSE_FLAGS); 1650 printf("Options: -[%s]\n", PARSE_FLAGS);
1041 for (i = 0; long_opts[i].name; ++i) 1651 for (i = 0; long_opts[i].name; ++i)
1042 if (long_opts[i].has_arg == no_argument) 1652 if (long_opts[i].has_arg == no_argument)
1043 printf(" -%c, --%-13s* %s\n", long_opts[i].val, 1653 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
1044 long_opts[i].name, opts_help[i]); 1654 long_opts[i].name, opts_help[i]);
1045 else 1655 else
1046 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val, 1656 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
1047 long_opts[i].name, opts_help[i]); 1657 long_opts[i].name, opts_help[i]);
1048 1658
1049 if (status != EXIT_SUCCESS) 1659 puts("\nFor more information, see the scanelf(1) manpage");
1050 exit(status);
1051
1052 puts("\nThe format modifiers for the -F option are:");
1053 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1054 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1055 puts(" i INTERP \tb BIND \ts symbol");
1056 puts(" N library \to Type \tT TEXTRELs");
1057 puts(" S SONAME");
1058 puts(" p filename (with search path removed)");
1059 puts(" f filename (short name/basename)");
1060 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1061
1062 exit(status); 1660 exit(status);
1063} 1661}
1064 1662
1065/* parse command line arguments and preform needed actions */ 1663/* parse command line arguments and preform needed actions */
1664#define do_pax_state(option, flag) \
1665 if (islower(option)) { \
1666 flags &= ~PF_##flag; \
1667 flags |= PF_NO##flag; \
1668 } else { \
1669 flags &= ~PF_NO##flag; \
1670 flags |= PF_##flag; \
1671 }
1066static void parseargs(int argc, char *argv[]) 1672static int parseargs(int argc, char *argv[])
1067{ 1673{
1068 int i; 1674 int i;
1069 char *from_file = NULL; 1675 const char *from_file = NULL;
1676 int ret = 0;
1070 1677
1071 opterr = 0; 1678 opterr = 0;
1072 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 1679 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1073 switch (i) { 1680 switch (i) {
1074 1681
1078 VERSION, __FILE__, __DATE__, rcsid, argv0); 1685 VERSION, __FILE__, __DATE__, rcsid, argv0);
1079 exit(EXIT_SUCCESS); 1686 exit(EXIT_SUCCESS);
1080 break; 1687 break;
1081 case 'h': usage(EXIT_SUCCESS); break; 1688 case 'h': usage(EXIT_SUCCESS); break;
1082 case 'f': 1689 case 'f':
1083 if (from_file) err("Don't specify -f twice"); 1690 if (from_file) warn("You prob don't want to specify -f twice");
1084 from_file = xstrdup(optarg); 1691 from_file = optarg;
1692 break;
1693 case 'E':
1694 strncpy(match_etypes, optarg, sizeof(match_etypes));
1695 break;
1696 case 'M':
1697 match_bits = atoi(optarg);
1085 break; 1698 break;
1086 case 'o': { 1699 case 'o': {
1087 FILE *fp = NULL;
1088 if ((fp = freopen(optarg, "w", stdout)) == NULL) 1700 if (freopen(optarg, "w", stdout) == NULL)
1089 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 1701 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1090 SET_STDOUT(fp);
1091 break; 1702 break;
1092 } 1703 }
1093 1704 case 'k':
1705 if (find_section) warn("You prob don't want to specify -k twice");
1706 find_section = optarg;
1707 break;
1094 case 's': { 1708 case 's': {
1095 size_t len;
1096 if (find_sym) err("Don't specify -s twice"); 1709 if (find_sym) warn("You prob don't want to specify -s twice");
1097 find_sym = xstrdup(optarg); 1710 find_sym = optarg;
1098 len = strlen(find_sym) + 1;
1099 versioned_symname = (char*)xmalloc(sizeof(char) * (len+1)); 1711 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1100 sprintf(versioned_symname, "%s@", find_sym); 1712 sprintf(versioned_symname, "%s@", find_sym);
1101 break; 1713 break;
1102 } 1714 }
1103 case 'N': { 1715 case 'N': {
1104 if (find_lib) err("Don't specify -N twice"); 1716 if (find_lib) warn("You prob don't want to specify -N twice");
1105 find_lib = xstrdup(optarg); 1717 find_lib = optarg;
1106 break; 1718 break;
1107 } 1719 }
1108 1720
1109 case 'F': { 1721 case 'F': {
1110 if (out_format) err("Don't specify -F twice"); 1722 if (out_format) warn("You prob don't want to specify -F twice");
1111 out_format = xstrdup(optarg); 1723 out_format = optarg;
1112 break; 1724 break;
1113 } 1725 }
1726 case 'z': {
1727 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1728 size_t x;
1114 1729
1730 for (x = 0 ; x < strlen(optarg); x++) {
1731 switch(optarg[x]) {
1732 case 'p':
1733 case 'P':
1734 do_pax_state(optarg[x], PAGEEXEC);
1735 break;
1736 case 's':
1737 case 'S':
1738 do_pax_state(optarg[x], SEGMEXEC);
1739 break;
1740 case 'm':
1741 case 'M':
1742 do_pax_state(optarg[x], MPROTECT);
1743 break;
1744 case 'e':
1745 case 'E':
1746 do_pax_state(optarg[x], EMUTRAMP);
1747 break;
1748 case 'r':
1749 case 'R':
1750 do_pax_state(optarg[x], RANDMMAP);
1751 break;
1752 case 'x':
1753 case 'X':
1754 do_pax_state(optarg[x], RANDEXEC);
1755 break;
1756 default:
1757 break;
1758 }
1759 }
1760 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
1761 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
1762 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
1763 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
1764 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1765 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1766 setpax = flags;
1767 break;
1768 }
1115 case 'g': gmatch = 1; 1769 case 'g': g_match = 1; break;
1770 case 'L': use_ldcache = 1; break;
1116 case 'y': scan_symlink = 0; break; 1771 case 'y': scan_symlink = 0; break;
1772 case 'A': scan_archives = 1; break;
1117 case 'B': show_banner = 0; break; 1773 case 'B': show_banner = 0; break;
1118 case 'l': scan_ldpath = 1; break; 1774 case 'l': scan_ldpath = 1; break;
1119 case 'p': scan_envpath = 1; break; 1775 case 'p': scan_envpath = 1; break;
1120 case 'R': dir_recurse = 1; break; 1776 case 'R': dir_recurse = 1; break;
1121 case 'm': dir_crossmount = 0; break; 1777 case 'm': dir_crossmount = 0; break;
1778 case 'X': ++fix_elf; break;
1122 case 'x': show_pax = 1; break; 1779 case 'x': show_pax = 1; break;
1123 case 'e': show_phdr = 1; break; 1780 case 'e': show_phdr = 1; break;
1124 case 't': show_textrel = 1; break; 1781 case 't': show_textrel = 1; break;
1125 case 'r': show_rpath = 1; break; 1782 case 'r': show_rpath = 1; break;
1126 case 'n': show_needed = 1; break; 1783 case 'n': show_needed = 1; break;
1131 case 'q': be_quiet = 1; break; 1788 case 'q': be_quiet = 1; break;
1132 case 'v': be_verbose = (be_verbose % 20) + 1; break; 1789 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1133 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break; 1790 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
1134 1791
1135 case ':': 1792 case ':':
1136 err("Option missing parameter\n"); 1793 err("Option '%c' is missing parameter", optopt);
1137 case '?': 1794 case '?':
1138 err("Unknown option\n"); 1795 err("Unknown option '%c' or argument missing", optopt);
1139 default: 1796 default:
1140 err("Unhandled option '%c'", i); 1797 err("Unhandled option '%c'; please report this", i);
1141 }
1142 } 1798 }
1143 1799 }
1800 if (show_textrels && be_verbose) {
1801 if (which("objdump") != NULL)
1802 has_objdump = 1;
1803 }
1144 /* let the format option override all other options */ 1804 /* let the format option override all other options */
1145 if (out_format) { 1805 if (out_format) {
1146 show_pax = show_phdr = show_textrel = show_rpath = \ 1806 show_pax = show_phdr = show_textrel = show_rpath = \
1147 show_needed = show_interp = show_bind = show_soname = \ 1807 show_needed = show_interp = show_bind = show_soname = \
1148 show_textrels = 0; 1808 show_textrels = 0;
1149 for (i = 0; out_format[i]; ++i) { 1809 for (i = 0; out_format[i]; ++i) {
1150 if (!IS_MODIFIER(out_format[i])) continue; 1810 if (!IS_MODIFIER(out_format[i])) continue;
1151 1811
1152 switch (out_format[++i]) { 1812 switch (out_format[++i]) {
1813 case '+': break;
1153 case '%': break; 1814 case '%': break;
1154 case '#': break; 1815 case '#': break;
1155 case 'F': break; 1816 case 'F': break;
1156 case 'p': break; 1817 case 'p': break;
1157 case 'f': break; 1818 case 'f': break;
1819 case 'k': break;
1158 case 's': break; 1820 case 's': break;
1159 case 'N': break; 1821 case 'N': break;
1160 case 'o': break; 1822 case 'o': break;
1823 case 'a': break;
1824 case 'M': break;
1161 case 'x': show_pax = 1; break; 1825 case 'x': show_pax = 1; break;
1162 case 'e': show_phdr = 1; break; 1826 case 'e': show_phdr = 1; break;
1163 case 't': show_textrel = 1; break; 1827 case 't': show_textrel = 1; break;
1164 case 'r': show_rpath = 1; break; 1828 case 'r': show_rpath = 1; break;
1165 case 'n': show_needed = 1; break; 1829 case 'n': show_needed = 1; break;
1166 case 'i': show_interp = 1; break; 1830 case 'i': show_interp = 1; break;
1167 case 'b': show_bind = 1; break; 1831 case 'b': show_bind = 1; break;
1168 case 'S': show_soname = 1; break; 1832 case 'S': show_soname = 1; break;
1169 case 'T': show_textrels = 1; break; 1833 case 'T': show_textrels = 1; break;
1170 default: 1834 default:
1171 err("Invalid format specifier '%c' (byte %i)", 1835 err("Invalid format specifier '%c' (byte %i)",
1172 out_format[i], i+1); 1836 out_format[i], i+1);
1173 } 1837 }
1174 } 1838 }
1175 1839
1176 /* construct our default format */ 1840 /* construct our default format */
1186 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 1850 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1187 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len); 1851 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1188 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len); 1852 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1189 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len); 1853 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1190 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len); 1854 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1855 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1191 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len); 1856 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1192 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 1857 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1193 } 1858 }
1194 if (be_verbose > 2) printf("Format: %s\n", out_format); 1859 if (be_verbose > 2) printf("Format: %s\n", out_format);
1195 1860
1196 /* now lets actually do the scanning */ 1861 /* now lets actually do the scanning */
1197 if (scan_ldpath || (show_rpath && be_quiet)) 1862 if (scan_ldpath || use_ldcache)
1198 load_ld_so_conf(); 1863 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
1199 if (scan_ldpath) scanelf_ldpath(); 1864 if (scan_ldpath) scanelf_ldpath();
1200 if (scan_envpath) scanelf_envpath(); 1865 if (scan_envpath) scanelf_envpath();
1866 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
1867 from_file = "-";
1201 if (from_file) { 1868 if (from_file) {
1202 scanelf_from_file(from_file); 1869 scanelf_from_file(from_file);
1203 free(from_file);
1204 from_file = *argv; 1870 from_file = *argv;
1205 } 1871 }
1206 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file) 1872 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1207 err("Nothing to scan !?"); 1873 err("Nothing to scan !?");
1208 while (optind < argc) { 1874 while (optind < argc) {
1209 search_path = argv[optind++]; 1875 search_path = argv[optind++];
1210 scanelf_dir(search_path); 1876 ret = scanelf_dir(search_path);
1211 } 1877 }
1212 1878
1213 /* clean up */ 1879 /* clean up */
1214 if (find_sym) {
1215 free(find_sym);
1216 free(versioned_symname); 1880 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) 1881 for (i = 0; ldpaths[i]; ++i)
1221 free(ldpaths[i]); 1882 free(ldpaths[i]);
1883
1884 if (ldcache != 0)
1885 munmap(ldcache, ldcache_size);
1886 return ret;
1887}
1888
1889static char **get_split_env(const char *envvar)
1890{
1891 const char *delims = " \t\n";
1892 char **envvals = NULL;
1893 char *env, *s;
1894 int nentry;
1895
1896 if ((env = getenv(envvar)) == NULL)
1897 return NULL;
1898
1899 env = xstrdup(env);
1900 if (env == NULL)
1901 return NULL;
1902
1903 s = strtok(env, delims);
1904 if (s == NULL) {
1905 free(env);
1906 return NULL;
1907 }
1908
1909 nentry = 0;
1910 while (s != NULL) {
1911 ++nentry;
1912 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
1913 envvals[nentry-1] = s;
1914 s = strtok(NULL, delims);
1915 }
1916 envvals[nentry] = NULL;
1917
1918 /* don't want to free(env) as it contains the memory that backs
1919 * the envvals array of strings */
1920 return envvals;
1921}
1922static void parseenv()
1923{
1924 qa_textrels = get_split_env("QA_TEXTRELS");
1925 qa_execstack = get_split_env("QA_EXECSTACK");
1926 qa_wx_load = get_split_env("QA_WX_LOAD");
1927}
1928
1929#ifdef __PAX_UTILS_CLEANUP
1930static void cleanup()
1931{
1932 free(out_format);
1933 free(qa_textrels);
1934 free(qa_execstack);
1935 free(qa_wx_load);
1936}
1937#endif
1938
1939
1940int main(int argc, char *argv[])
1941{
1942 int ret;
1943 if (argc < 2)
1944 usage(EXIT_FAILURE);
1945 parseenv();
1946 ret = parseargs(argc, argv);
1947 fclose(stdout);
1948#ifdef __PAX_UTILS_CLEANUP
1949 cleanup();
1950 warn("The calls to add/delete heap should be off:\n"
1951 "\t- 1 due to the out_buffer not being freed in scanelf_file()\n"
1952 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
1953#endif
1954 return ret;
1222} 1955}
1223 1956
1224 1957
1225 1958
1226/* utility funcs */ 1959/* utility funcs */
1228{ 1961{
1229 char *ret = strdup(s); 1962 char *ret = strdup(s);
1230 if (!ret) err("Could not strdup(): %s", strerror(errno)); 1963 if (!ret) err("Could not strdup(): %s", strerror(errno));
1231 return ret; 1964 return ret;
1232} 1965}
1233
1234static void *xmalloc(size_t size) 1966static void *xmalloc(size_t size)
1235{ 1967{
1236 void *ret = malloc(size); 1968 void *ret = malloc(size);
1237 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size); 1969 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1238 return ret; 1970 return ret;
1239} 1971}
1240 1972static void *xrealloc(void *ptr, size_t size)
1973{
1974 void *ret = realloc(ptr, size);
1975 if (!ret) err("Could not realloc() %li bytes", (unsigned long)size);
1976 return ret;
1977}
1241static void xstrcat(char **dst, const char *src, size_t *curr_len) 1978static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
1242{ 1979{
1243 size_t new_len; 1980 size_t new_len;
1244 1981
1245 new_len = strlen(*dst) + strlen(src); 1982 new_len = strlen(*dst) + strlen(src);
1246 if (*curr_len <= new_len) { 1983 if (*curr_len <= new_len) {
1247 *curr_len = new_len + (*curr_len / 2); 1984 *curr_len = new_len + (*curr_len / 2);
1248 *dst = realloc(*dst, *curr_len); 1985 *dst = realloc(*dst, *curr_len);
1249 if (!*dst) 1986 if (!*dst)
1250 err("could not realloc %li bytes", (unsigned long)*curr_len); 1987 err("could not realloc() %li bytes", (unsigned long)*curr_len);
1251 } 1988 }
1252 1989
1990 if (n)
1991 strncat(*dst, src, n);
1992 else
1253 strcat(*dst, src); 1993 strcat(*dst, src);
1254} 1994}
1255
1256static inline void xchrcat(char **dst, const char append, size_t *curr_len) 1995static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1257{ 1996{
1258 static char my_app[2]; 1997 static char my_app[2];
1259 my_app[0] = append; 1998 my_app[0] = append;
1260 my_app[1] = '\0'; 1999 my_app[1] = '\0';
1261 xstrcat(dst, my_app, curr_len); 2000 xstrcat(dst, my_app, curr_len);
1262} 2001}
1263 2002
1264 2003/* Match filename against entries in matchlist, return TRUE
1265 2004 * if the file is listed */
1266int main(int argc, char *argv[]) 2005static int file_matches_list(const char *filename, char **matchlist)
1267{ 2006{
1268 if (argc < 2) 2007 char **file;
1269 usage(EXIT_FAILURE); 2008 char *match;
1270 parseargs(argc, argv); 2009 char buf[__PAX_UTILS_PATH_MAX];
1271 fclose(stdout); 2010
1272#ifdef __BOUNDS_CHECKING_ON 2011 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()"); 2012 return 0;
1274#endif 2013
1275 return EXIT_SUCCESS; 2014 for (file = matchlist; *file != NULL; file++) {
2015 if (search_path) {
2016 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2017 match = buf;
2018 } else {
2019 match = *file;
2020 }
2021 if (fnmatch(match, filename, 0) == 0)
2022 return 1;
2023 }
2024 return 0;
1276} 2025}

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