/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.88 Revision 1.206
1/* 1/*
2 * Copyright 2003-2005 Gentoo Foundation 2 * Copyright 2003-2007 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 1.206 2008/12/30 13:34:46 vapier Exp $
5 * 5 *
6 * Copyright 2003-2005 Ned Ludd - <solar@gentoo.org> 6 * Copyright 2003-2007 Ned Ludd - <solar@gentoo.org>
7 * Copyright 2004-2005 Mike Frysinger - <vapier@gentoo.org> 7 * Copyright 2004-2007 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"
24
25static const char *rcsid = "$Id: scanelf.c,v 1.88 2005/09/30 03:30:54 vapier Exp $"; 10static const char *rcsid = "$Id: scanelf.c,v 1.206 2008/12/30 13:34:46 vapier Exp $";
26#define argv0 "scanelf" 11const char * const argv0 = "scanelf";
27 12
13#include "paxinc.h"
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 int rematch(const char *regex, const char *match, int cflags);
40static void *xmalloc(size_t size);
41static void xstrcat(char **dst, const char *src, size_t *curr_len);
42static inline void xchrcat(char **dst, const char append, size_t *curr_len);
43 31
44/* variables to control behavior */ 32/* variables to control behavior */
33static char match_etypes[126] = "";
45static char *ldpaths[256]; 34static char *ldpaths[256];
46static char scan_ldpath = 0; 35static char scan_ldpath = 0;
47static char scan_envpath = 0; 36static char scan_envpath = 0;
48static char scan_symlink = 1; 37static char scan_symlink = 1;
38static char scan_archives = 0;
49static char dir_recurse = 0; 39static char dir_recurse = 0;
50static char dir_crossmount = 1; 40static char dir_crossmount = 1;
51static char show_pax = 0; 41static char show_pax = 0;
42static char show_perms = 0;
43static char show_size = 0;
52static char show_phdr = 0; 44static char show_phdr = 0;
53static char show_textrel = 0; 45static char show_textrel = 0;
54static char show_rpath = 0; 46static char show_rpath = 0;
55static char show_needed = 0; 47static char show_needed = 0;
56static char show_interp = 0; 48static char show_interp = 0;
57static char show_bind = 0; 49static char show_bind = 0;
58static char show_soname = 0; 50static char show_soname = 0;
59static char show_textrels = 0; 51static char show_textrels = 0;
60static char show_banner = 1; 52static char show_banner = 1;
53static char show_endian = 0;
54static char show_osabi = 0;
55static char show_eabi = 0;
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;
64static char *find_sym = NULL, *versioned_symname = NULL; 59static char be_semi_verbose = 0;
60static char *find_sym = 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 g_match = 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
73static int match_bits = 0;
74static unsigned int match_perms = 0;
75static caddr_t ldcache = 0;
76static size_t ldcache_size = 0;
77static unsigned long setpax = 0UL;
78
79static int 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 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 if ((ret = regcomp(&preg, regex, cflags))) {
114 char err[256];
115
116 if (regerror(ret, &preg, err, sizeof(err)))
117 fprintf(stderr, "regcomp failed: %s", err);
118 else
119 fprintf(stderr, "regcomp failed");
120
121 return EXIT_FAILURE;
122 }
123 ret = regexec(&preg, match, 0, NULL, 0);
124 regfree(&preg);
125
126 return ret;
127}
70 128
71/* sub-funcs for scanelf_file() */ 129/* sub-funcs for scanelf_file() */
72static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab) 130static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
73{ 131{
74 /* find the best SHT_DYNSYM and SHT_STRTAB sections */ 132 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
93 } \ 151 } \
94 } 152 }
95 GET_SYMTABS(32) 153 GET_SYMTABS(32)
96 GET_SYMTABS(64) 154 GET_SYMTABS(64)
97} 155}
156
98static char *scanelf_file_pax(elfobj *elf, char *found_pax) 157static char *scanelf_file_pax(elfobj *elf, char *found_pax)
99{ 158{
100 static char *paxflags;
101 static char ret[7]; 159 static char ret[7];
102 unsigned long i, shown; 160 unsigned long i, shown;
103 161
104 if (!show_pax) return NULL; 162 if (!show_pax) return NULL;
105 163
112 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 170 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
113 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 171 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
114 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 172 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
115 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \ 173 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
116 continue; \ 174 continue; \
117 if (be_quiet && (EGET(phdr[i].p_flags) == 10240)) \ 175 if (fix_elf && setpax) { \
176 /* set the paxctl flags */ \
177 ESET(phdr[i].p_flags, setpax); \
178 } \
179 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
118 continue; \ 180 continue; \
119 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \ 181 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
120 *found_pax = 1; \ 182 *found_pax = 1; \
121 ++shown; \ 183 ++shown; \
122 break; \ 184 break; \
124 } 186 }
125 SHOW_PAX(32) 187 SHOW_PAX(32)
126 SHOW_PAX(64) 188 SHOW_PAX(64)
127 } 189 }
128 190
191 if (fix_elf && setpax) {
192 /* set the chpax settings */
193 if (elf->elf_class == ELFCLASS32) {
194 if (EHDR32(elf->ehdr)->e_type == ET_DYN || EHDR32(elf->ehdr)->e_type == ET_EXEC)
195 ESET(EHDR32(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
196 } else {
197 if (EHDR64(elf->ehdr)->e_type == ET_DYN || EHDR64(elf->ehdr)->e_type == ET_EXEC)
198 ESET(EHDR64(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
199 }
200 }
201
129 /* fall back to EI_PAX if no PT_PAX was found */ 202 /* fall back to EI_PAX if no PT_PAX was found */
130 if (!*ret) { 203 if (!*ret) {
204 static char *paxflags;
131 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf)); 205 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
132 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) { 206 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
133 *found_pax = 1; 207 *found_pax = 1;
134 return paxflags; 208 return (be_wewy_wewy_quiet ? NULL : paxflags);
135 } 209 }
136 strncpy(ret, paxflags, sizeof(ret)); 210 strncpy(ret, paxflags, sizeof(ret));
137 } 211 }
138 212
139 if (be_quiet && !shown) 213 if (be_wewy_wewy_quiet || (be_quiet && !shown))
140 return NULL; 214 return NULL;
215 else
141 return ret; 216 return ret;
142
143} 217}
218
144static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load) 219static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
145{ 220{
146 static char ret[12]; 221 static char ret[12];
147 char *found; 222 char *found;
148 unsigned long i, off, shown, check_flags;
149 unsigned char multi_stack, multi_relro, multi_load; 223 unsigned long i, shown, multi_stack, multi_relro, multi_load;
224 int max_pt_load;
150 225
151 if (!show_phdr) return NULL; 226 if (!show_phdr) return NULL;
152 227
153 memcpy(ret, "--- --- ---\0", 12); 228 memcpy(ret, "--- --- ---\0", 12);
154 229
155 shown = 0; 230 shown = 0;
156 multi_stack = multi_relro = multi_load = 0; 231 multi_stack = multi_relro = multi_load = 0;
232 max_pt_load = elf_max_pt_load(elf);
157 233
158 if (elf->phdr) { 234#define NOTE_GNU_STACK ".note.GNU-stack"
159#define SHOW_PHDR(B) \ 235#define SHOW_PHDR(B) \
160 if (elf->elf_class == ELFCLASS ## B) { \ 236 if (elf->elf_class == ELFCLASS ## B) { \
161 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 237 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
238 Elf ## B ## _Off offset; \
239 uint32_t flags, check_flags; \
240 if (elf->phdr != NULL) { \
162 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 241 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
163 uint32_t flags; \
164 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 242 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
165 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \ 243 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
244 if (multi_stack++) \
166 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \ 245 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
246 if (file_matches_list(elf->filename, qa_execstack)) \
247 continue; \
167 found = found_phdr; \ 248 found = found_phdr; \
168 off = 0; \ 249 offset = 0; \
169 check_flags = PF_X; \ 250 check_flags = PF_X; \
170 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \ 251 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
252 if (multi_relro++) \
171 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \ 253 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
172 found = found_relro; \ 254 found = found_relro; \
173 off = 4; \ 255 offset = 4; \
174 check_flags = PF_X; \ 256 check_flags = PF_X; \
175 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \ 257 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
176 if (multi_load++ > 2) warnf("%s: more than 2 PT_LOAD's !?", elf->filename); \ 258 if (EGET(ehdr->e_type) == ET_DYN || EGET(ehdr->e_type) == ET_EXEC) \
259 if (multi_load++ > max_pt_load) \
260 warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
261 if (file_matches_list(elf->filename, qa_wx_load)) \
262 continue; \
177 found = found_load; \ 263 found = found_load; \
178 off = 8; \ 264 offset = 8; \
179 check_flags = PF_W|PF_X; \ 265 check_flags = PF_W|PF_X; \
180 } else \ 266 } else \
181 continue; \ 267 continue; \
182 flags = EGET(phdr[i].p_flags); \ 268 flags = EGET(phdr[i].p_flags); \
183 if (be_quiet && ((flags & check_flags) != check_flags)) \ 269 if (be_quiet && ((flags & check_flags) != check_flags)) \
184 continue; \ 270 continue; \
271 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
272 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
273 ret[3] = ret[7] = '!'; \
274 flags = EGET(phdr[i].p_flags); \
275 } \
185 memcpy(ret+off, gnu_short_stack_flags(flags), 3); \ 276 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
186 *found = 1; \ 277 *found = 1; \
187 ++shown; \ 278 ++shown; \
279 } \
280 } else if (elf->shdr != NULL) { \
281 /* no program headers which means this is prob an object file */ \
282 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
283 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
284 char *str; \
285 if ((void*)strtbl > (void*)elf->data_end) \
286 goto skip_this_shdr##B; \
287 check_flags = SHF_WRITE|SHF_EXECINSTR; \
288 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
289 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
290 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
291 str = elf->data + offset; \
292 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
293 if (!strcmp(str, NOTE_GNU_STACK)) { \
294 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
295 flags = EGET(shdr[i].sh_flags); \
296 if (be_quiet && ((flags & check_flags) != check_flags)) \
297 continue; \
298 ++*found_phdr; \
299 shown = 1; \
300 if (flags & SHF_WRITE) ret[0] = 'W'; \
301 if (flags & SHF_ALLOC) ret[1] = 'A'; \
302 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
303 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
304 break; \
305 } \
306 } \
307 skip_this_shdr##B: \
308 if (!multi_stack) { \
309 if (file_matches_list(elf->filename, qa_execstack)) \
310 return NULL; \
311 *found_phdr = 1; \
312 shown = 1; \
313 memcpy(ret, "!WX", 3); \
314 } \
188 } \ 315 } \
189 } 316 }
190 SHOW_PHDR(32) 317 SHOW_PHDR(32)
191 SHOW_PHDR(64) 318 SHOW_PHDR(64)
192 }
193 319
194 if (be_quiet && !shown) 320 if (be_wewy_wewy_quiet || (be_quiet && !shown))
195 return NULL; 321 return NULL;
196 else 322 else
197 return ret; 323 return ret;
198} 324}
325
326/*
327 * See if this ELF contains a DT_TEXTREL tag in any of its
328 * PT_DYNAMIC sections.
329 */
199static char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 330static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
200{ 331{
201 static char ret[] = "TEXTREL"; 332 static const char *ret = "TEXTREL";
202 unsigned long i; 333 unsigned long i;
203 334
204 if (!show_textrel && !show_textrels) return NULL; 335 if (!show_textrel && !show_textrels) return NULL;
336
337 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
205 338
206 if (elf->phdr) { 339 if (elf->phdr) {
207#define SHOW_TEXTREL(B) \ 340#define SHOW_TEXTREL(B) \
208 if (elf->elf_class == ELFCLASS ## B) { \ 341 if (elf->elf_class == ELFCLASS ## B) { \
209 Elf ## B ## _Dyn *dyn; \ 342 Elf ## B ## _Dyn *dyn; \
210 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 343 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
211 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 344 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
212 Elf ## B ## _Off offset; \ 345 Elf ## B ## _Off offset; \
213 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 346 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
214 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 347 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
215 offset = EGET(phdr[i].p_offset); \ 348 offset = EGET(phdr[i].p_offset); \
216 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 349 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
217 dyn = DYN ## B (elf->data + offset); \ 350 dyn = DYN ## B (elf->data + offset); \
218 while (EGET(dyn->d_tag) != DT_NULL) { \ 351 while (EGET(dyn->d_tag) != DT_NULL) { \
219 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \ 352 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
229 } 362 }
230 363
231 if (be_quiet || be_wewy_wewy_quiet) 364 if (be_quiet || be_wewy_wewy_quiet)
232 return NULL; 365 return NULL;
233 else 366 else
234 return (char *)" - "; 367 return " - ";
235} 368}
369
370/*
371 * Scan the .text section to see if there are any relocations in it.
372 * Should rewrite this to check PT_LOAD sections that are marked
373 * Executable rather than the section named '.text'.
374 */
236static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel) 375static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
237{ 376{
238 unsigned long s, r, rmax; 377 unsigned long s, r, rmax;
239 void *symtab_void, *strtab_void, *text_void; 378 void *symtab_void, *strtab_void, *text_void;
240 379
292 if (be_verbose <= 2) continue; \ 431 if (be_verbose <= 2) continue; \
293 } else \ 432 } else \
294 *found_textrels = 1; \ 433 *found_textrels = 1; \
295 /* locate this relocation symbol name */ \ 434 /* locate this relocation symbol name */ \
296 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 435 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
436 if ((void*)sym > (void*)elf->data_end) { \
437 warn("%s: corrupt ELF symbol", elf->filename); \
438 continue; \
439 } \
297 sym_max = ELF ## B ## _R_SYM(r_info); \ 440 sym_max = ELF ## B ## _R_SYM(r_info); \
298 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \ 441 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
299 sym += sym_max; \ 442 sym += sym_max; \
300 else \ 443 else \
301 sym = NULL; \ 444 sym = NULL; \
303 /* show the raw details about this reloc */ \ 446 /* show the raw details about this reloc */ \
304 printf(" %s: ", elf->base_filename); \ 447 printf(" %s: ", elf->base_filename); \
305 if (sym && sym->st_name) \ 448 if (sym && sym->st_name) \
306 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \ 449 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \
307 else \ 450 else \
308 printf("(memory/fake?)"); \ 451 printf("(memory/data?)"); \
309 printf(" [0x%lX]", (unsigned long)r_offset); \ 452 printf(" [0x%lX]", (unsigned long)r_offset); \
310 /* now try to find the closest symbol that this rel is probably in */ \ 453 /* now try to find the closest symbol that this rel is probably in */ \
311 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 454 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
312 func = NULL; \ 455 func = NULL; \
313 offset_tmp = 0; \ 456 offset_tmp = 0; \
317 offset_tmp = EGET(sym->st_value); \ 460 offset_tmp = EGET(sym->st_value); \
318 } \ 461 } \
319 ++sym; \ 462 ++sym; \
320 } \ 463 } \
321 printf(" in "); \ 464 printf(" in "); \
322 if (func && func->st_name) \ 465 if (func && func->st_name) { \
323 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \ 466 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
467 if (r_offset > EGET(func->st_size)) \
468 printf("(optimized out: previous %s)", func_name); \
324 else \ 469 else \
325 printf("(NULL: fake?)"); \ 470 printf("%s", func_name); \
471 } else \
472 printf("(optimized out)"); \
326 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \ 473 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
474 if (be_verbose && has_objdump) { \
475 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
476 char *sysbuf; \
477 size_t syslen; \
478 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"; \
479 syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
480 sysbuf = xmalloc(syslen); \
481 if (end_addr < r_offset) \
482 /* not uncommon when things are optimized out */ \
483 end_addr = r_offset + 0x100; \
484 snprintf(sysbuf, syslen, sysfmt, \
485 (unsigned long)offset_tmp, \
486 (unsigned long)end_addr, \
487 elf->filename, \
488 (unsigned long)r_offset); \
489 fflush(stdout); \
490 system(sysbuf); \
491 fflush(stdout); \
492 free(sysbuf); \
493 } \
327 } \ 494 } \
328 } } 495 } }
329 SHOW_TEXTRELS(32) 496 SHOW_TEXTRELS(32)
330 SHOW_TEXTRELS(64) 497 SHOW_TEXTRELS(64)
331 } 498 }
333 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename); 500 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
334 501
335 return NULL; 502 return NULL;
336} 503}
337 504
338static void rpath_security_checks(elfobj *, char *); 505static void rpath_security_checks(elfobj *, char *, const char *);
339static void rpath_security_checks(elfobj *elf, char *item) { 506static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
507{
340 struct stat st; 508 struct stat st;
341 switch (*item) { 509 switch (*item) {
342 case 0:
343 warnf("Security problem NULL RPATH in %s", elf->filename);
344 break;
345 case '/': break; 510 case '/': break;
511 case '.':
512 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
513 break;
514 case ':':
515 case '\0':
516 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
517 break;
346 case '$': 518 case '$':
347 if (fstat(elf->fd, &st) != -1) 519 if (fstat(elf->fd, &st) != -1)
348 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID)) 520 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", 521 warnf("Security problem with %s='%s' in %s with mode set of %o",
350 item, elf->filename, st.st_mode & 07777); 522 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
351 break; 523 break;
352 default: 524 default:
353 warnf("Maybe? sec problem with RPATH='%s' in %s", item, elf->filename); 525 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
354 break; 526 break;
355 } 527 }
356} 528}
357static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len) 529static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
358{ 530{
375 Elf ## B ## _Off offset; \ 547 Elf ## B ## _Off offset; \
376 Elf ## B ## _Xword word; \ 548 Elf ## B ## _Xword word; \
377 /* Scan all the program headers */ \ 549 /* Scan all the program headers */ \
378 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 550 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
379 /* Just scan dynamic headers */ \ 551 /* Just scan dynamic headers */ \
380 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 552 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
381 offset = EGET(phdr[i].p_offset); \ 553 offset = EGET(phdr[i].p_offset); \
382 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 554 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
383 /* Just scan dynamic RPATH/RUNPATH headers */ \ 555 /* Just scan dynamic RPATH/RUNPATH headers */ \
384 dyn = DYN ## B (elf->data + offset); \ 556 dyn = DYN ## B (elf->data + offset); \
385 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \ 557 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
394 /* Verify the memory is somewhat sane */ \ 566 /* Verify the memory is somewhat sane */ \
395 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 567 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
396 if (offset < (Elf ## B ## _Off)elf->len) { \ 568 if (offset < (Elf ## B ## _Off)elf->len) { \
397 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \ 569 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
398 *r = (char*)(elf->data + offset); \ 570 *r = (char*)(elf->data + offset); \
571 /* cache the length in case we need to nuke this section later on */ \
572 if (fix_elf) \
573 offset = strlen(*r); \
399 /* If quiet, don't output paths in ld.so.conf */ \ 574 /* If quiet, don't output paths in ld.so.conf */ \
400 if (be_quiet) { \ 575 if (be_quiet) { \
401 size_t len; \ 576 size_t len; \
402 char *start, *end; \ 577 char *start, *end; \
403 /* note that we only 'chop' off leading known paths. */ \ 578 /* note that we only 'chop' off leading known paths. */ \
404 /* since *r is read-only memory, we can only move the ptr forward. */ \ 579 /* since *r is read-only memory, we can only move the ptr forward. */ \
405 start = *r; \ 580 start = *r; \
406 /* scan each path in : delimited list */ \ 581 /* scan each path in : delimited list */ \
407 while (start) { \ 582 while (start) { \
408 rpath_security_checks(elf, start); \ 583 rpath_security_checks(elf, start, get_elfdtype(word)); \
409 end = strchr(start, ':'); \ 584 end = strchr(start, ':'); \
410 len = (end ? abs(end - start) : strlen(start)); \ 585 len = (end ? abs(end - start) : strlen(start)); \
586 if (use_ldcache) \
411 for (s = 0; ldpaths[s]; ++s) { \ 587 for (s = 0; ldpaths[s]; ++s) \
412 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \ 588 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
413 *r = (end ? end + 1 : NULL); \ 589 *r = end; \
590 /* corner case ... if RPATH reads "/usr/lib:", we want \
591 * to show ':' rather than '' */ \
592 if (end && end[1] != '\0') \
593 (*r)++; \
414 break; \ 594 break; \
415 } \ 595 } \
416 } \
417 if (!*r || !ldpaths[s] || !end) \ 596 if (!*r || !end) \
418 start = NULL; \ 597 break; \
419 else \ 598 else \
420 start = start + len + 1; \ 599 start = start + len + 1; \
421 } \ 600 } \
422 } \ 601 } \
602 if (*r) { \
603 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
604 /* just nuke it */ \
605 nuke_it##B: \
606 memset(*r, 0x00, offset); \
607 *r = NULL; \
608 ESET(dyn->d_tag, DT_DEBUG); \
609 ESET(dyn->d_un.d_ptr, 0); \
610 } else if (fix_elf) { \
611 /* try to clean "bad" paths */ \
612 size_t len, tmpdir_len; \
613 char *start, *end; \
614 const char *tmpdir; \
615 start = *r; \
616 tmpdir = (getenv("TMPDIR") ? : "."); \
617 tmpdir_len = strlen(tmpdir); \
618 while (1) { \
619 end = strchr(start, ':'); \
620 if (start == end) { \
621 eat_this_path##B: \
622 len = strlen(end); \
623 memmove(start, end+1, len); \
624 start[len-1] = '\0'; \
625 end = start - 1; \
626 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
627 if (!end) { \
628 if (start == *r) \
629 goto nuke_it##B; \
630 *--start = '\0'; \
631 } else \
632 goto eat_this_path##B; \
633 } \
634 if (!end) \
635 break; \
636 start = end + 1; \
637 } \
638 if (**r == '\0') \
639 goto nuke_it##B; \
640 } \
641 if (*r) \
423 if (*r) *found_rpath = 1; \ 642 *found_rpath = 1; \
643 } \
424 } \ 644 } \
425 ++dyn; \ 645 ++dyn; \
426 } \ 646 } \
427 } } 647 } }
428 SHOW_RPATH(32) 648 SHOW_RPATH(32)
445 } else if (rpath || runpath) 665 } else if (rpath || runpath)
446 xstrcat(ret, (runpath ? runpath : rpath), ret_len); 666 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
447 else if (!be_quiet) 667 else if (!be_quiet)
448 xstrcat(ret, " - ", ret_len); 668 xstrcat(ret, " - ", ret_len);
449} 669}
670
671#define LDSO_CACHE_MAGIC "ld.so-"
672#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
673#define LDSO_CACHE_VER "1.7.0"
674#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
675#define FLAG_ANY -1
676#define FLAG_TYPE_MASK 0x00ff
677#define FLAG_LIBC4 0x0000
678#define FLAG_ELF 0x0001
679#define FLAG_ELF_LIBC5 0x0002
680#define FLAG_ELF_LIBC6 0x0003
681#define FLAG_REQUIRED_MASK 0xff00
682#define FLAG_SPARC_LIB64 0x0100
683#define FLAG_IA64_LIB64 0x0200
684#define FLAG_X8664_LIB64 0x0300
685#define FLAG_S390_LIB64 0x0400
686#define FLAG_POWERPC_LIB64 0x0500
687#define FLAG_MIPS64_LIBN32 0x0600
688#define FLAG_MIPS64_LIBN64 0x0700
689
690static char *lookup_cache_lib(elfobj *, char *);
691
692#if defined(__GLIBC__) || defined(__UCLIBC__)
693
694static char *lookup_cache_lib(elfobj *elf, char *fname)
695{
696 int fd = 0;
697 char *strs;
698 static char buf[__PAX_UTILS_PATH_MAX] = "";
699 const char *cachefile = "/etc/ld.so.cache";
700 struct stat st;
701
702 typedef struct {
703 char magic[LDSO_CACHE_MAGIC_LEN];
704 char version[LDSO_CACHE_VER_LEN];
705 int nlibs;
706 } header_t;
707 header_t *header;
708
709 typedef struct {
710 int flags;
711 int sooffset;
712 int liboffset;
713 } libentry_t;
714 libentry_t *libent;
715
716 if (fname == NULL)
717 return NULL;
718
719 if (ldcache == 0) {
720 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1)
721 return NULL;
722
723 /* cache these values so we only map/unmap the cache file once */
724 ldcache_size = st.st_size;
725 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
726
727 close(fd);
728
729 if (ldcache == MAP_FAILED) {
730 ldcache = 0;
731 return NULL;
732 }
733
734 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
735 return NULL;
736 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
737 return NULL;
738 }
739
740 header = (header_t *) ldcache;
741 libent = (libentry_t *) (ldcache + sizeof(header_t));
742 strs = (char *) &libent[header->nlibs];
743
744 for (fd = 0; fd < header->nlibs; fd++) {
745 /* this should be more fine grained, but for now we assume that
746 * diff arches will not be cached together. and we ignore the
747 * the different multilib mips cases. */
748 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
749 continue;
750 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
751 continue;
752
753 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
754 continue;
755 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
756 }
757 return buf;
758}
759#elif defined(__NetBSD__)
760static char *lookup_cache_lib(elfobj *elf, char *fname)
761{
762 static char buf[__PAX_UTILS_PATH_MAX] = "";
763 static struct stat st;
764
765 char **ldpath;
766 for (ldpath = ldpaths; *ldpath != NULL; ldpath++) {
767 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", *ldpath, fname) >= sizeof(buf))
768 continue; /* if the pathname is too long, or something went wrong, ignore */
769
770 if (stat(buf, &st) != 0)
771 continue; /* if the lib doesn't exist in *ldpath, look further */
772
773 /* NetBSD doesn't actually do sanity checks, it just loads the file
774 * and if that doesn't work, continues looking in other directories.
775 * This cannot easily be safely emulated, unfortunately. For now,
776 * just assume that if it exists, it's a valid library. */
777
778 return buf;
779 }
780
781 /* not found in any path */
782 return NULL;
783}
784#else
785#ifdef __ELF__
786#warning Cache support not implemented for your target
787#endif
788static char *lookup_cache_lib(elfobj *elf, char *fname)
789{
790 return NULL;
791}
792#endif
793
450static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len) 794static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
451{ 795{
452 unsigned long i; 796 unsigned long i;
453 char *needed; 797 char *needed;
454 void *strtbl_void; 798 void *strtbl_void;
799 char *p;
455 800
456 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL; 801 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
457 802
458 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 803 strtbl_void = elf_findsecbyname(elf, ".dynstr");
459 804
464 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 809 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
465 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 810 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
466 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 811 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
467 Elf ## B ## _Off offset; \ 812 Elf ## B ## _Off offset; \
468 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 813 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
469 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 814 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
470 offset = EGET(phdr[i].p_offset); \ 815 offset = EGET(phdr[i].p_offset); \
471 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 816 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
472 dyn = DYN ## B (elf->data + offset); \ 817 dyn = DYN ## B (elf->data + offset); \
473 while (EGET(dyn->d_tag) != DT_NULL) { \ 818 while (EGET(dyn->d_tag) != DT_NULL) { \
474 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 819 if (EGET(dyn->d_tag) == DT_NEEDED) { \
479 } \ 824 } \
480 needed = (char*)(elf->data + offset); \ 825 needed = (char*)(elf->data + offset); \
481 if (op == 0) { \ 826 if (op == 0) { \
482 if (!be_wewy_wewy_quiet) { \ 827 if (!be_wewy_wewy_quiet) { \
483 if (*found_needed) xchrcat(ret, ',', ret_len); \ 828 if (*found_needed) xchrcat(ret, ',', ret_len); \
829 if (use_ldcache) \
830 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
831 needed = p; \
484 xstrcat(ret, needed, ret_len); \ 832 xstrcat(ret, needed, ret_len); \
485 } \ 833 } \
486 *found_needed = 1; \ 834 *found_needed = 1; \
487 } else { \ 835 } else { \
488 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \ 836 if (!strncmp(find_lib, needed, strlen( !g_match ? needed : find_lib))) { \
489 *found_lib = 1; \ 837 *found_lib = 1; \
490 return (be_wewy_wewy_quiet ? NULL : needed); \ 838 return (be_wewy_wewy_quiet ? NULL : needed); \
491 } \ 839 } \
492 } \ 840 } \
493 } \ 841 } \
524} 872}
525static char *scanelf_file_bind(elfobj *elf, char *found_bind) 873static char *scanelf_file_bind(elfobj *elf, char *found_bind)
526{ 874{
527 unsigned long i; 875 unsigned long i;
528 struct stat s; 876 struct stat s;
877 char dynamic = 0;
529 878
530 if (!show_bind) return NULL; 879 if (!show_bind) return NULL;
531 if (!elf->phdr) return NULL; 880 if (!elf->phdr) return NULL;
532 881
533#define SHOW_BIND(B) \ 882#define SHOW_BIND(B) \
535 Elf ## B ## _Dyn *dyn; \ 884 Elf ## B ## _Dyn *dyn; \
536 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 885 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
537 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 886 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
538 Elf ## B ## _Off offset; \ 887 Elf ## B ## _Off offset; \
539 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 888 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
540 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 889 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
890 dynamic = 1; \
541 offset = EGET(phdr[i].p_offset); \ 891 offset = EGET(phdr[i].p_offset); \
542 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 892 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
543 dyn = DYN ## B (elf->data + offset); \ 893 dyn = DYN ## B (elf->data + offset); \
544 while (EGET(dyn->d_tag) != DT_NULL) { \ 894 while (EGET(dyn->d_tag) != DT_NULL) { \
545 if (EGET(dyn->d_tag) == DT_BIND_NOW || \ 895 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
556 SHOW_BIND(32) 906 SHOW_BIND(32)
557 SHOW_BIND(64) 907 SHOW_BIND(64)
558 908
559 if (be_wewy_wewy_quiet) return NULL; 909 if (be_wewy_wewy_quiet) return NULL;
560 910
911 /* 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)) { 912 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
562 return NULL; 913 return NULL;
563 } else { 914 } else {
564 *found_bind = 1; 915 *found_bind = 1;
565 return (char *) "LAZY"; 916 return (char *) (dynamic ? "LAZY" : "STATIC");
566 } 917 }
567} 918}
568static char *scanelf_file_soname(elfobj *elf, char *found_soname) 919static char *scanelf_file_soname(elfobj *elf, char *found_soname)
569{ 920{
570 unsigned long i; 921 unsigned long i;
582 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 933 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
583 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 934 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
584 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 935 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
585 Elf ## B ## _Off offset; \ 936 Elf ## B ## _Off offset; \
586 /* only look for soname in shared objects */ \ 937 /* only look for soname in shared objects */ \
587 if (ehdr->e_type != ET_DYN) \ 938 if (EGET(ehdr->e_type) != ET_DYN) \
588 return NULL; \ 939 return NULL; \
589 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 940 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
590 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 941 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
591 offset = EGET(phdr[i].p_offset); \ 942 offset = EGET(phdr[i].p_offset); \
592 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 943 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
593 dyn = DYN ## B (elf->data + offset); \ 944 dyn = DYN ## B (elf->data + offset); \
594 while (EGET(dyn->d_tag) != DT_NULL) { \ 945 while (EGET(dyn->d_tag) != DT_NULL) { \
595 if (EGET(dyn->d_tag) == DT_SONAME) { \ 946 if (EGET(dyn->d_tag) == DT_SONAME) { \
609 SHOW_SONAME(64) 960 SHOW_SONAME(64)
610 } 961 }
611 962
612 return NULL; 963 return NULL;
613} 964}
965
966static int scanelf_match_symname(const char *symname, const char *tomatch) {
967 /* We do things differently when checking with regexp */
968 if (g_match) {
969 return rematch(symname, tomatch, REG_EXTENDED) == 0;
970 } else {
971 const size_t symname_len = strlen(symname);
972 return (strncmp(symname, tomatch, symname_len) == 0 &&
973 /* Accept unversioned symbol names */
974 (tomatch[symname_len] == '\0' || tomatch[symname_len] == '@'));
975 }
976}
977
614static char *scanelf_file_sym(elfobj *elf, char *found_sym) 978static char *scanelf_file_sym(elfobj *elf, char *found_sym)
615{ 979{
616 unsigned long i; 980 unsigned long i;
981 char *ret;
617 void *symtab_void, *strtab_void; 982 void *symtab_void, *strtab_void;
618 983
619 if (!find_sym) return NULL; 984 if (!find_sym) return NULL;
985 ret = find_sym;
620 986
621 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void); 987 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
622 988
623 if (symtab_void && strtab_void) { 989 if (symtab_void && strtab_void) {
624#define FIND_SYM(B) \ 990#define FIND_SYM(B) \
625 if (elf->elf_class == ELFCLASS ## B) { \ 991 if (elf->elf_class == ELFCLASS ## B) { \
626 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 992 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
627 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 993 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
628 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 994 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
629 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 995 unsigned long cnt = EGET(symtab->sh_entsize); \
630 char *symname; \ 996 char *symname; \
997 if (cnt) \
998 cnt = EGET(symtab->sh_size) / cnt; \
631 for (i = 0; i < cnt; ++i) { \ 999 for (i = 0; i < cnt; ++i) { \
1000 if ((void*)sym > (void*)elf->data_end) { \
1001 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1002 goto break_out; \
1003 } \
632 if (sym->st_name) { \ 1004 if (sym->st_name) { \
1005 /* make sure the symbol name is in acceptable memory range */ \
633 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 1006 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
634 if (*find_sym == '*') { \ 1007 if ((void*)symname > (void*)elf->data_end) { \
1008 warnf("%s: corrupt ELF symbols", elf->filename); \
1009 ++sym; \
1010 continue; \
1011 } \
1012 /* debug display ... show all symbols and some extra info */ \
1013 if (0 && g_match ? rematch(ret, symname, REG_EXTENDED) == 0 : *ret == '*') { \
635 printf("%s(%s) %5lX %15s %s\n", \ 1014 printf("%s(%s) %5lX %15s %s %s\n", \
636 ((*found_sym == 0) ? "\n\t" : "\t"), \ 1015 ((*found_sym == 0) ? "\n\t" : "\t"), \
637 elf->base_filename, \ 1016 elf->base_filename, \
638 (long)sym->st_size, \ 1017 (unsigned long)sym->st_size, \
639 (char *)get_elfstttype(sym->st_info), \ 1018 get_elfstttype(sym->st_info), \
640 symname); \ 1019 sym->st_shndx == SHN_UNDEF ? "U" : "D", symname); \
641 *found_sym = 1; \ 1020 *found_sym = 1; \
642 } else if ((strcmp(find_sym, symname) == 0) || \ 1021 } else { \
643 (strcmp(symname, versioned_symname) == 0)) \ 1022 /* allow the user to specify a comma delimited list of symbols to search for */ \
1023 char *this_sym, *next_sym; \
1024 next_sym = ret; \
1025 while (next_sym) { \
1026 this_sym = next_sym; \
1027 if ((next_sym = strchr(this_sym, ','))) \
1028 next_sym += 1; /* Skip the comma */ \
1029 /* do we want a defined symbol ? */ \
1030 if (*this_sym == '+') { \
1031 if (sym->st_shndx == SHN_UNDEF) \
1032 continue; \
1033 ++this_sym; \
1034 /* do we want an undefined symbol ? */ \
1035 } else if (*this_sym == '-') { \
1036 if (sym->st_shndx != SHN_UNDEF) \
1037 continue; \
1038 ++this_sym; \
1039 } \
1040 if (next_sym) /* Copy it so that we don't have to worry about the final , */ \
1041 this_sym = strndup(this_sym, next_sym-this_sym); \
1042 /* ok, lets compare the name now */ \
1043 if (scanelf_match_symname(this_sym, symname)) { \
1044 if (be_semi_verbose) { \
1045 char buf[126]; \
1046 snprintf(buf, sizeof(buf), "%lX %s %s", \
1047 (unsigned long)sym->st_size, get_elfstttype(sym->st_info), this_sym); \
1048 ret = buf; \
1049 } else \
1050 ret = symname; \
644 (*found_sym)++; \ 1051 (*found_sym)++; \
1052 goto break_out; \
1053 } \
1054 if (next_sym) free(this_sym); \
1055 } \
1056 } \
645 } \ 1057 } \
646 ++sym; \ 1058 ++sym; \
647 } } 1059 } }
648 FIND_SYM(32) 1060 FIND_SYM(32)
649 FIND_SYM(64) 1061 FIND_SYM(64)
650 } 1062 }
651 1063
1064break_out:
652 if (be_wewy_wewy_quiet) return NULL; 1065 if (be_wewy_wewy_quiet) return NULL;
653 1066
654 if (*find_sym != '*' && *found_sym) 1067 if (*find_sym != '*' && *found_sym)
655 return find_sym; 1068 return ret;
656 if (be_quiet) 1069 if (be_quiet)
657 return NULL; 1070 return NULL;
658 else 1071 else
659 return (char *)" - "; 1072 return (char *)" - ";
660} 1073}
1074
1075static char *scanelf_file_sections(elfobj *elf, char *found_section)
1076{
1077 if (!find_section)
1078 return NULL;
1079
1080#define FIND_SECTION(B) \
1081 if (elf->elf_class == ELFCLASS ## B) { \
1082 int invert; \
1083 Elf ## B ## _Shdr *section; \
1084 invert = (*find_section == '!' ? 1 : 0); \
1085 section = SHDR ## B (elf_findsecbyname(elf, find_section+invert)); \
1086 if ((section == NULL && invert) || (section != NULL && !invert)) \
1087 *found_section = 1; \
1088 }
1089 FIND_SECTION(32)
1090 FIND_SECTION(64)
1091
1092 if (be_wewy_wewy_quiet)
1093 return NULL;
1094
1095 if (*found_section)
1096 return find_section;
1097
1098 if (be_quiet)
1099 return NULL;
1100 else
1101 return (char *)" - ";
1102}
1103
661/* scan an elf file and show all the fun stuff */ 1104/* scan an elf file and show all the fun stuff */
662#define prints(str) write(fileno(stdout), str, strlen(str)) 1105#define prints(str) write(fileno(stdout), str, strlen(str))
663static void scanelf_file(const char *filename) 1106static int scanelf_elfobj(elfobj *elf)
664{ 1107{
665 unsigned long i; 1108 unsigned long i;
666 char found_pax, found_phdr, found_relro, found_load, found_textrel, 1109 char found_pax, found_phdr, found_relro, found_load, found_textrel,
667 found_rpath, found_needed, found_interp, found_bind, found_soname, 1110 found_rpath, found_needed, found_interp, found_bind, found_soname,
668 found_sym, found_lib, found_file, found_textrels; 1111 found_sym, found_lib, found_file, found_textrels, found_section;
669 elfobj *elf;
670 struct stat st;
671 static char *out_buffer = NULL; 1112 static char *out_buffer = NULL;
672 static size_t out_len; 1113 static size_t out_len;
673 1114
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 = \ 1115 found_pax = found_phdr = found_relro = found_load = found_textrel = \
690 found_rpath = found_needed = found_interp = found_bind = found_soname = \ 1116 found_rpath = found_needed = found_interp = found_bind = found_soname = \
691 found_sym = found_lib = found_file = found_textrels = 0; 1117 found_sym = found_lib = found_file = found_textrels = found_section = 0;
692 1118
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) 1119 if (be_verbose > 2)
700 printf("%s: scanning file {%s,%s}\n", filename, 1120 printf("%s: scanning file {%s,%s}\n", elf->filename,
701 get_elfeitype(EI_CLASS, elf->elf_class), 1121 get_elfeitype(EI_CLASS, elf->elf_class),
702 get_elfeitype(EI_DATA, elf->data[EI_DATA])); 1122 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
703 else if (be_verbose) 1123 else if (be_verbose > 1)
704 printf("%s: scanning file\n", filename); 1124 printf("%s: scanning file\n", elf->filename);
705 1125
706 /* init output buffer */ 1126 /* init output buffer */
707 if (!out_buffer) { 1127 if (!out_buffer) {
708 out_len = sizeof(char) * 80; 1128 out_len = sizeof(char) * 80;
709 out_buffer = (char*)xmalloc(out_len); 1129 out_buffer = xmalloc(out_len);
710 } 1130 }
711 *out_buffer = '\0'; 1131 *out_buffer = '\0';
712 1132
713 /* show the header */ 1133 /* show the header */
714 if (!be_quiet && show_banner) { 1134 if (!be_quiet && show_banner) {
715 for (i = 0; out_format[i]; ++i) { 1135 for (i = 0; out_format[i]; ++i) {
716 if (!IS_MODIFIER(out_format[i])) continue; 1136 if (!IS_MODIFIER(out_format[i])) continue;
717 1137
718 switch (out_format[++i]) { 1138 switch (out_format[++i]) {
1139 case '+': break;
719 case '%': break; 1140 case '%': break;
720 case '#': break; 1141 case '#': break;
721 case 'F': 1142 case 'F':
722 case 'p': 1143 case 'p':
723 case 'f': prints("FILE "); found_file = 1; break; 1144 case 'f': prints("FILE "); found_file = 1; break;
724 case 'o': prints(" TYPE "); break; 1145 case 'o': prints(" TYPE "); break;
725 case 'x': prints(" PAX "); break; 1146 case 'x': prints(" PAX "); break;
726 case 'e': prints("STK/REL/PTL "); break; 1147 case 'e': prints("STK/REL/PTL "); break;
727 case 't': prints("TEXTREL "); break; 1148 case 't': prints("TEXTREL "); break;
728 case 'r': prints("RPATH "); break; 1149 case 'r': prints("RPATH "); break;
1150 case 'M': prints("CLASS "); break;
729 case 'n': prints("NEEDED "); break; 1151 case 'n': prints("NEEDED "); break;
730 case 'i': prints("INTERP "); break; 1152 case 'i': prints("INTERP "); break;
731 case 'b': prints("BIND "); break; 1153 case 'b': prints("BIND "); break;
1154 case 'Z': prints("SIZE "); break;
732 case 'S': prints("SONAME "); break; 1155 case 'S': prints("SONAME "); break;
733 case 's': prints("SYM "); break; 1156 case 's': prints("SYM "); break;
734 case 'N': prints("LIB "); break; 1157 case 'N': prints("LIB "); break;
735 case 'T': prints("TEXTRELS "); break; 1158 case 'T': prints("TEXTRELS "); break;
1159 case 'k': prints("SECTION "); break;
1160 case 'a': prints("ARCH "); break;
1161 case 'I': prints("OSABI "); break;
1162 case 'Y': prints("EABI "); break;
1163 case 'O': prints("PERM "); break;
1164 case 'D': prints("ENDIAN "); break;
736 default: warnf("'%c' has no title ?", out_format[i]); 1165 default: warnf("'%c' has no title ?", out_format[i]);
737 } 1166 }
738 } 1167 }
739 if (!found_file) prints("FILE "); 1168 if (!found_file) prints("FILE ");
740 prints("\n"); 1169 prints("\n");
744 1173
745 /* dump all the good stuff */ 1174 /* dump all the good stuff */
746 for (i = 0; out_format[i]; ++i) { 1175 for (i = 0; out_format[i]; ++i) {
747 const char *out; 1176 const char *out;
748 const char *tmp; 1177 const char *tmp;
749 1178 static char ubuf[sizeof(unsigned long)*2];
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])) { 1179 if (!IS_MODIFIER(out_format[i])) {
755 xchrcat(&out_buffer, out_format[i], &out_len); 1180 xchrcat(&out_buffer, out_format[i], &out_len);
756 continue; 1181 continue;
757 } 1182 }
758 1183
759 out = NULL; 1184 out = NULL;
760 be_wewy_wewy_quiet = (out_format[i] == '#'); 1185 be_wewy_wewy_quiet = (out_format[i] == '#');
1186 be_semi_verbose = (out_format[i] == '+');
761 switch (out_format[++i]) { 1187 switch (out_format[++i]) {
1188 case '+':
762 case '%': 1189 case '%':
763 case '#': 1190 case '#':
764 xchrcat(&out_buffer, out_format[i], &out_len); break; 1191 xchrcat(&out_buffer, out_format[i], &out_len); break;
765 case 'F': 1192 case 'F':
766 found_file = 1; 1193 found_file = 1;
767 if (be_wewy_wewy_quiet) break; 1194 if (be_wewy_wewy_quiet) break;
768 xstrcat(&out_buffer, filename, &out_len); 1195 xstrcat(&out_buffer, elf->filename, &out_len);
769 break; 1196 break;
770 case 'p': 1197 case 'p':
771 found_file = 1; 1198 found_file = 1;
772 if (be_wewy_wewy_quiet) break; 1199 if (be_wewy_wewy_quiet) break;
773 tmp = filename; 1200 tmp = elf->filename;
774 if (search_path) { 1201 if (search_path) {
775 ssize_t len_search = strlen(search_path); 1202 ssize_t len_search = strlen(search_path);
776 ssize_t len_file = strlen(filename); 1203 ssize_t len_file = strlen(elf->filename);
777 if (!strncmp(filename, search_path, len_search) && \ 1204 if (!strncmp(elf->filename, search_path, len_search) && \
778 len_file > len_search) 1205 len_file > len_search)
779 tmp += len_search; 1206 tmp += len_search;
780 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++; 1207 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
781 } 1208 }
782 xstrcat(&out_buffer, tmp, &out_len); 1209 xstrcat(&out_buffer, tmp, &out_len);
783 break; 1210 break;
784 case 'f': 1211 case 'f':
785 found_file = 1; 1212 found_file = 1;
786 if (be_wewy_wewy_quiet) break; 1213 if (be_wewy_wewy_quiet) break;
787 tmp = strrchr(filename, '/'); 1214 tmp = strrchr(elf->filename, '/');
788 tmp = (tmp == NULL ? filename : tmp+1); 1215 tmp = (tmp == NULL ? elf->filename : tmp+1);
789 xstrcat(&out_buffer, tmp, &out_len); 1216 xstrcat(&out_buffer, tmp, &out_len);
790 break; 1217 break;
791 case 'o': out = get_elfetype(elf); break; 1218 case 'o': out = get_elfetype(elf); break;
792 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1219 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; 1220 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; 1221 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
795 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break; 1222 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; 1223 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1224 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1225 case 'D': out = get_endian(elf); break;
1226 case 'O': out = strfileperms(elf->filename); break;
797 case 'n': 1227 case 'n':
798 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break; 1228 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; 1229 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
800 case 'b': out = scanelf_file_bind(elf, &found_bind); break; 1230 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
801 case 'S': out = scanelf_file_soname(elf, &found_soname); break; 1231 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
802 case 's': out = scanelf_file_sym(elf, &found_sym); break; 1232 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1233 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1234 case 'a': out = get_elfemtype(elf); break;
1235 case 'I': out = get_elfosabi(elf); break;
1236 case 'Y': out = get_elf_eabi(elf); break;
1237 case 'Z': snprintf(ubuf, sizeof(ubuf), "%lu", (unsigned long)elf->len); out = ubuf; break;;
803 default: warnf("'%c' has no scan code?", out_format[i]); 1238 default: warnf("'%c' has no scan code?", out_format[i]);
804 } 1239 }
1240 if (out) {
1241 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
1242 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
1243 xstrncat(&out_buffer, out, &out_len, (tmp-out));
1244 else
805 if (out) xstrcat(&out_buffer, out, &out_len); 1245 xstrcat(&out_buffer, out, &out_len);
1246 }
806 } 1247 }
807 1248
808#define FOUND_SOMETHING() \ 1249#define FOUND_SOMETHING() \
809 (found_pax || found_phdr || found_relro || found_load || found_textrel || \ 1250 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
810 found_rpath || found_needed || found_interp || found_bind || \ 1251 found_rpath || found_needed || found_interp || found_bind || \
811 found_soname || found_sym || found_lib || found_textrels) 1252 found_soname || found_sym || found_lib || found_textrels || found_section )
812 1253
813 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) { 1254 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
814 xchrcat(&out_buffer, ' ', &out_len); 1255 xchrcat(&out_buffer, ' ', &out_len);
815 xstrcat(&out_buffer, filename, &out_len); 1256 xstrcat(&out_buffer, elf->filename, &out_len);
816 } 1257 }
817 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) { 1258 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
818 puts(out_buffer); 1259 puts(out_buffer);
819 fflush(stdout); 1260 fflush(stdout);
820 } 1261 }
821 1262
1263 return 0;
1264}
1265
1266/* scan a single elf */
1267static int scanelf_elf(const char *filename, int fd, size_t len)
1268{
1269 int ret = 1;
1270 elfobj *elf;
1271
1272 /* verify this is real ELF */
1273 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1274 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1275 return ret;
1276 }
1277 switch (match_bits) {
1278 case 32:
1279 if (elf->elf_class != ELFCLASS32)
1280 goto label_done;
1281 break;
1282 case 64:
1283 if (elf->elf_class != ELFCLASS64)
1284 goto label_done;
1285 break;
1286 default: break;
1287 }
1288 if (strlen(match_etypes)) {
1289 char sbuf[126];
1290 strncpy(sbuf, match_etypes, sizeof(sbuf));
1291 if (strchr(match_etypes, ',') != NULL) {
1292 char *p;
1293 while ((p = strrchr(sbuf, ',')) != NULL) {
1294 *p = 0;
1295 if (etype_lookup(p+1) == get_etype(elf))
1296 goto label_ret;
1297 }
1298 }
1299 if (etype_lookup(sbuf) != get_etype(elf))
1300 goto label_done;
1301 }
1302
1303label_ret:
1304 ret = scanelf_elfobj(elf);
1305
1306label_done:
822 unreadelf(elf); 1307 unreadelf(elf);
1308 return ret;
1309}
1310
1311/* scan an archive of elfs */
1312static int scanelf_archive(const char *filename, int fd, size_t len)
1313{
1314 archive_handle *ar;
1315 archive_member *m;
1316 char *ar_buffer;
1317 elfobj *elf;
1318
1319 ar = ar_open_fd(filename, fd);
1320 if (ar == NULL)
1321 return 1;
1322
1323 ar_buffer = mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1324 while ((m=ar_next(ar)) != NULL) {
1325 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size);
1326 if (elf) {
1327 scanelf_elfobj(elf);
1328 unreadelf(elf);
1329 }
1330 }
1331 munmap(ar_buffer, len);
1332
1333 return 0;
1334}
1335/* scan a file which may be an elf or an archive or some other magical beast */
1336static int scanelf_file(const char *filename, const struct stat *st_cache)
1337{
1338 const struct stat *st = st_cache;
1339 struct stat symlink_st;
1340 int fd;
1341
1342 /* always handle regular files and handle symlinked files if no -y */
1343 if (S_ISLNK(st->st_mode)) {
1344 if (!scan_symlink) return 1;
1345 stat(filename, &symlink_st);
1346 st = &symlink_st;
1347 }
1348
1349 if (!S_ISREG(st->st_mode)) {
1350 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1351 return 1;
1352 }
1353
1354 if (match_perms) {
1355 if ((st->st_mode | match_perms) != st->st_mode)
1356 return 1;
1357 }
1358 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1359 return 1;
1360
1361 if (scanelf_elf(filename, fd, st->st_size) == 1 && scan_archives)
1362 /* if it isn't an ELF, maybe it's an .a archive */
1363 scanelf_archive(filename, fd, st->st_size);
1364
1365 close(fd);
1366 return 0;
823} 1367}
824 1368
825/* scan a directory for ET_EXEC files and print when we find one */ 1369/* scan a directory for ET_EXEC files and print when we find one */
826static void scanelf_dir(const char *path) 1370static int scanelf_dir(const char *path)
827{ 1371{
828 register DIR *dir; 1372 register DIR *dir;
829 register struct dirent *dentry; 1373 register struct dirent *dentry;
830 struct stat st_top, st; 1374 struct stat st_top, st;
831 char buf[_POSIX_PATH_MAX]; 1375 char buf[__PAX_UTILS_PATH_MAX];
832 size_t pathlen = 0, len = 0; 1376 size_t pathlen = 0, len = 0;
1377 int ret = 0;
833 1378
834 /* make sure path exists */ 1379 /* make sure path exists */
835 if (lstat(path, &st_top) == -1) { 1380 if (lstat(path, &st_top) == -1) {
836 if (be_verbose > 2) printf("%s: does not exist\n", path); 1381 if (be_verbose > 2) printf("%s: does not exist\n", path);
837 return; 1382 return 1;
838 } 1383 }
839 1384
840 /* ok, if it isn't a directory, assume we can open it */ 1385 /* ok, if it isn't a directory, assume we can open it */
841 if (!S_ISDIR(st_top.st_mode)) { 1386 if (!S_ISDIR(st_top.st_mode)) {
842 scanelf_file(path); 1387 return scanelf_file(path, &st_top);
843 return;
844 } 1388 }
845 1389
846 /* now scan the dir looking for fun stuff */ 1390 /* now scan the dir looking for fun stuff */
847 if ((dir = opendir(path)) == NULL) { 1391 if ((dir = opendir(path)) == NULL) {
848 warnf("could not opendir %s: %s", path, strerror(errno)); 1392 warnf("could not opendir %s: %s", path, strerror(errno));
849 return; 1393 return 1;
850 } 1394 }
851 if (be_verbose) printf("%s: scanning dir\n", path); 1395 if (be_verbose > 1) printf("%s: scanning dir\n", path);
852 1396
853 pathlen = strlen(path); 1397 pathlen = strlen(path);
854 while ((dentry = readdir(dir))) { 1398 while ((dentry = readdir(dir))) {
855 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1399 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
856 continue; 1400 continue;
858 if (len >= sizeof(buf)) { 1402 if (len >= sizeof(buf)) {
859 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path, 1403 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
860 (unsigned long)len, (unsigned long)sizeof(buf)); 1404 (unsigned long)len, (unsigned long)sizeof(buf));
861 continue; 1405 continue;
862 } 1406 }
863 sprintf(buf, "%s/%s", path, dentry->d_name); 1407 snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name);
864 if (lstat(buf, &st) != -1) { 1408 if (lstat(buf, &st) != -1) {
865 if (S_ISREG(st.st_mode)) 1409 if (S_ISREG(st.st_mode))
866 scanelf_file(buf); 1410 ret = scanelf_file(buf, &st);
867 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1411 else if (dir_recurse && S_ISDIR(st.st_mode)) {
868 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1412 if (dir_crossmount || (st_top.st_dev == st.st_dev))
869 scanelf_dir(buf); 1413 ret = scanelf_dir(buf);
870 } 1414 }
871 } 1415 }
872 } 1416 }
873 closedir(dir); 1417 closedir(dir);
1418 return ret;
874} 1419}
875 1420
876static int scanelf_from_file(char *filename) 1421static int scanelf_from_file(const char *filename)
877{ 1422{
878 FILE *fp = NULL; 1423 FILE *fp = NULL;
879 char *p; 1424 char *p;
880 char path[_POSIX_PATH_MAX]; 1425 char path[__PAX_UTILS_PATH_MAX];
1426 int ret = 0;
881 1427
882 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL)) 1428 if (strcmp(filename, "-") == 0)
883 fp = stdin; 1429 fp = stdin;
884 else if ((fp = fopen(filename, "r")) == NULL) 1430 else if ((fp = fopen(filename, "r")) == NULL)
885 return 1; 1431 return 1;
886 1432
887 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1433 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
888 if ((p = strchr(path, '\n')) != NULL) 1434 if ((p = strchr(path, '\n')) != NULL)
889 *p = 0; 1435 *p = 0;
890 search_path = path; 1436 search_path = path;
891 scanelf_dir(path); 1437 ret = scanelf_dir(path);
892 } 1438 }
893 if (fp != stdin) 1439 if (fp != stdin)
894 fclose(fp); 1440 fclose(fp);
895 return 0; 1441 return ret;
896} 1442}
897 1443
898static void load_ld_so_conf() 1444#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1445
1446static int load_ld_cache_config(int i, const char *fname)
899{ 1447{
900 FILE *fp = NULL; 1448 FILE *fp = NULL;
901 char *p; 1449 char *p;
902 char path[_POSIX_PATH_MAX]; 1450 char path[__PAX_UTILS_PATH_MAX];
903 int i = 0;
904 1451
905 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1452 if (i + 1 == ARRAY_SIZE(ldpaths))
906 return; 1453 return i;
907 1454
1455 if ((fp = fopen(fname, "r")) == NULL)
1456 return i;
1457
908 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1458 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
909 if (*path != '/')
910 continue;
911
912 if ((p = strrchr(path, '\r')) != NULL) 1459 if ((p = strrchr(path, '\r')) != NULL)
913 *p = 0; 1460 *p = 0;
914 if ((p = strchr(path, '\n')) != NULL) 1461 if ((p = strchr(path, '\n')) != NULL)
915 *p = 0; 1462 *p = 0;
1463#ifdef __linux__
1464 /* recursive includes of the same file will make this segfault. */
1465 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1466 glob64_t gl;
1467 size_t x;
1468 char gpath[__PAX_UTILS_PATH_MAX];
1469
1470 memset(gpath, 0, sizeof(gpath));
1471
1472 if (path[8] != '/')
1473 snprintf(gpath, sizeof(gpath), "/etc/%s", &path[8]);
1474 else
1475 strncpy(gpath, &path[8], sizeof(gpath));
1476
1477 if ((glob64(gpath, 0, NULL, &gl)) == 0) {
1478 for (x = 0; x < gl.gl_pathc; ++x) {
1479 /* try to avoid direct loops */
1480 if (strcmp(gl.gl_pathv[x], fname) == 0)
1481 continue;
1482 i = load_ld_cache_config(i, gl.gl_pathv[x]);
1483 if (i + 1 >= ARRAY_SIZE(ldpaths)) {
1484 globfree64(&gl);
1485 return i;
1486 }
1487 }
1488 globfree64 (&gl);
1489 continue;
1490 }
1491 }
1492#endif
1493 if (*path != '/')
1494 continue;
916 1495
917 ldpaths[i++] = xstrdup(path); 1496 ldpaths[i++] = xstrdup(path);
918 1497
919 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths)) 1498 if (i + 1 == ARRAY_SIZE(ldpaths))
920 break; 1499 break;
921 } 1500 }
922 ldpaths[i] = NULL; 1501 ldpaths[i] = NULL;
923 1502
924 fclose(fp); 1503 fclose(fp);
1504 return i;
925} 1505}
1506
1507#elif defined(__FreeBSD__) || (__DragonFly__)
1508
1509static int load_ld_cache_config(int i, const char *fname)
1510{
1511 FILE *fp = NULL;
1512 char *b = NULL, *p;
1513 struct elfhints_hdr hdr;
1514
1515 if (i + 1 == ARRAY_SIZE(ldpaths))
1516 return i;
1517
1518 if ((fp = fopen(fname, "r")) == NULL)
1519 return i;
1520
1521 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1522 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1523 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1524 {
1525 fclose(fp);
1526 return i;
1527 }
1528
1529 b = xmalloc(hdr.dirlistlen + 1);
1530 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1531 fclose(fp);
1532 free(b);
1533 return i;
1534 }
1535
1536 while ((p = strsep(&b, ":"))) {
1537 if (*p == '\0') continue;
1538 ldpaths[i++] = xstrdup(p);
1539
1540 if (i + 1 == ARRAY_SIZE(ldpaths))
1541 break;
1542 }
1543 ldpaths[i] = NULL;
1544
1545 free(b);
1546 fclose(fp);
1547 return i;
1548}
1549
1550#else
1551#ifdef __ELF__
1552#warning Cache config support not implemented for your target
1553#endif
1554static int load_ld_cache_config(int i, const char *fname)
1555{
1556 memset(ldpaths, 0x00, sizeof(ldpaths));
1557 return 0;
1558}
1559#endif
926 1560
927/* scan /etc/ld.so.conf for paths */ 1561/* scan /etc/ld.so.conf for paths */
928static void scanelf_ldpath() 1562static void scanelf_ldpath(void)
929{ 1563{
930 char scan_l, scan_ul, scan_ull; 1564 char scan_l, scan_ul, scan_ull;
931 int i = 0; 1565 int i = 0;
932 1566
933 if (!ldpaths[0]) 1567 if (!ldpaths[0])
947 if (!scan_ul) scanelf_dir("/usr/lib"); 1581 if (!scan_ul) scanelf_dir("/usr/lib");
948 if (!scan_ull) scanelf_dir("/usr/local/lib"); 1582 if (!scan_ull) scanelf_dir("/usr/local/lib");
949} 1583}
950 1584
951/* scan env PATH for paths */ 1585/* scan env PATH for paths */
952static void scanelf_envpath() 1586static void scanelf_envpath(void)
953{ 1587{
954 char *path, *p; 1588 char *path, *p;
955 1589
956 path = getenv("PATH"); 1590 path = getenv("PATH");
957 if (!path) 1591 if (!path)
964 } 1598 }
965 1599
966 free(path); 1600 free(path);
967} 1601}
968 1602
969 1603/* usage / invocation handling functions */ /* Free Flags: c d j u w C G H J K P Q U W */
970
971/* usage / invocation handling functions */
972#define PARSE_FLAGS "plRmyxetrnibSs:gN:TaqvF:f:o:BhV" 1604#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZBhV"
973#define a_argument required_argument 1605#define a_argument required_argument
974static struct option const long_opts[] = { 1606static struct option const long_opts[] = {
975 {"path", no_argument, NULL, 'p'}, 1607 {"path", no_argument, NULL, 'p'},
976 {"ldpath", no_argument, NULL, 'l'}, 1608 {"ldpath", no_argument, NULL, 'l'},
977 {"recursive", no_argument, NULL, 'R'}, 1609 {"recursive", no_argument, NULL, 'R'},
978 {"mount", no_argument, NULL, 'm'}, 1610 {"mount", no_argument, NULL, 'm'},
979 {"symlink", no_argument, NULL, 'y'}, 1611 {"symlink", no_argument, NULL, 'y'},
1612 {"archives", no_argument, NULL, 'A'},
1613 {"ldcache", no_argument, NULL, 'L'},
1614 {"fix", no_argument, NULL, 'X'},
1615 {"setpax", a_argument, NULL, 'z'},
980 {"pax", no_argument, NULL, 'x'}, 1616 {"pax", no_argument, NULL, 'x'},
981 {"header", no_argument, NULL, 'e'}, 1617 {"header", no_argument, NULL, 'e'},
982 {"textrel", no_argument, NULL, 't'}, 1618 {"textrel", no_argument, NULL, 't'},
983 {"rpath", no_argument, NULL, 'r'}, 1619 {"rpath", no_argument, NULL, 'r'},
984 {"needed", no_argument, NULL, 'n'}, 1620 {"needed", no_argument, NULL, 'n'},
985 {"interp", no_argument, NULL, 'i'}, 1621 {"interp", no_argument, NULL, 'i'},
986 {"bind", no_argument, NULL, 'b'}, 1622 {"bind", no_argument, NULL, 'b'},
987 {"soname", no_argument, NULL, 'S'}, 1623 {"soname", no_argument, NULL, 'S'},
988 {"symbol", a_argument, NULL, 's'}, 1624 {"symbol", a_argument, NULL, 's'},
1625 {"section", a_argument, NULL, 'k'},
989 {"lib", a_argument, NULL, 'N'}, 1626 {"lib", a_argument, NULL, 'N'},
990 {"gmatch", no_argument, NULL, 'g'}, 1627 {"gmatch", no_argument, NULL, 'g'},
991 {"textrels", no_argument, NULL, 'T'}, 1628 {"textrels", no_argument, NULL, 'T'},
1629 {"etype", a_argument, NULL, 'E'},
1630 {"bits", a_argument, NULL, 'M'},
1631 {"endian", no_argument, NULL, 'D'},
1632 {"osabi", no_argument, NULL, 'I'},
1633 {"eabi", no_argument, NULL, 'Y'},
1634 {"perms", a_argument, NULL, 'O'},
1635 {"size", no_argument, NULL, 'Z'},
992 {"all", no_argument, NULL, 'a'}, 1636 {"all", no_argument, NULL, 'a'},
993 {"quiet", no_argument, NULL, 'q'}, 1637 {"quiet", no_argument, NULL, 'q'},
994 {"verbose", no_argument, NULL, 'v'}, 1638 {"verbose", no_argument, NULL, 'v'},
995 {"format", a_argument, NULL, 'F'}, 1639 {"format", a_argument, NULL, 'F'},
996 {"from", a_argument, NULL, 'f'}, 1640 {"from", a_argument, NULL, 'f'},
1004static const char *opts_help[] = { 1648static const char *opts_help[] = {
1005 "Scan all directories in PATH environment", 1649 "Scan all directories in PATH environment",
1006 "Scan all directories in /etc/ld.so.conf", 1650 "Scan all directories in /etc/ld.so.conf",
1007 "Scan directories recursively", 1651 "Scan directories recursively",
1008 "Don't recursively cross mount points", 1652 "Don't recursively cross mount points",
1009 "Don't scan symlinks\n", 1653 "Don't scan symlinks",
1654 "Scan archives (.a files)",
1655 "Utilize ld.so.cache information (use with -r/-n)",
1656 "Try and 'fix' bad things (use with -r/-e)",
1657 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1010 "Print PaX markings", 1658 "Print PaX markings",
1011 "Print GNU_STACK/PT_LOAD markings", 1659 "Print GNU_STACK/PT_LOAD markings",
1012 "Print TEXTREL information", 1660 "Print TEXTREL information",
1013 "Print RPATH information", 1661 "Print RPATH information",
1014 "Print NEEDED information", 1662 "Print NEEDED information",
1015 "Print INTERP information", 1663 "Print INTERP information",
1016 "Print BIND information", 1664 "Print BIND information",
1017 "Print SONAME information", 1665 "Print SONAME information",
1018 "Find a specified symbol", 1666 "Find a specified symbol",
1667 "Find a specified section",
1019 "Find a specified library", 1668 "Find a specified library",
1020 "Use strncmp to match libraries. (use with -N)", 1669 "Use strncmp to match libraries. (use with -N)",
1021 "Locate cause of TEXTREL", 1670 "Locate cause of TEXTREL",
1671 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1672 "Print only ELF files matching numeric bits",
1673 "Print Endianness",
1674 "Print OSABI",
1675 "Print EABI (EM_ARM Only)",
1676 "Print only ELF files matching octal permissions",
1677 "Print ELF file size",
1022 "Print all scanned info (-x -e -t -r -b)\n", 1678 "Print all scanned info (-x -e -t -r -b)\n",
1023 "Only output 'bad' things", 1679 "Only output 'bad' things",
1024 "Be verbose (can be specified more than once)", 1680 "Be verbose (can be specified more than once)",
1025 "Use specified format for output", 1681 "Use specified format for output",
1026 "Read input stream from a filename", 1682 "Read input stream from a filename",
1034/* display usage and exit */ 1690/* display usage and exit */
1035static void usage(int status) 1691static void usage(int status)
1036{ 1692{
1037 unsigned long i; 1693 unsigned long i;
1038 printf("* Scan ELF binaries for stuff\n\n" 1694 printf("* Scan ELF binaries for stuff\n\n"
1039 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0); 1695 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1040 printf("Options: -[%s]\n", PARSE_FLAGS); 1696 printf("Options: -[%s]\n", PARSE_FLAGS);
1041 for (i = 0; long_opts[i].name; ++i) 1697 for (i = 0; long_opts[i].name; ++i)
1042 if (long_opts[i].has_arg == no_argument) 1698 if (long_opts[i].has_arg == no_argument)
1043 printf(" -%c, --%-13s* %s\n", long_opts[i].val, 1699 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
1044 long_opts[i].name, opts_help[i]); 1700 long_opts[i].name, opts_help[i]);
1045 else 1701 else
1046 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val, 1702 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
1047 long_opts[i].name, opts_help[i]); 1703 long_opts[i].name, opts_help[i]);
1048 1704
1049 if (status != EXIT_SUCCESS) 1705 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); 1706 exit(status);
1063} 1707}
1064 1708
1065/* parse command line arguments and preform needed actions */ 1709/* parse command line arguments and preform needed actions */
1710#define do_pax_state(option, flag) \
1711 if (islower(option)) { \
1712 flags &= ~PF_##flag; \
1713 flags |= PF_NO##flag; \
1714 } else { \
1715 flags &= ~PF_NO##flag; \
1716 flags |= PF_##flag; \
1717 }
1066static void parseargs(int argc, char *argv[]) 1718static int parseargs(int argc, char *argv[])
1067{ 1719{
1068 int i; 1720 int i;
1069 char *from_file = NULL; 1721 const char *from_file = NULL;
1722 int ret = 0;
1070 1723
1071 opterr = 0; 1724 opterr = 0;
1072 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 1725 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1073 switch (i) { 1726 switch (i) {
1074 1727
1078 VERSION, __FILE__, __DATE__, rcsid, argv0); 1731 VERSION, __FILE__, __DATE__, rcsid, argv0);
1079 exit(EXIT_SUCCESS); 1732 exit(EXIT_SUCCESS);
1080 break; 1733 break;
1081 case 'h': usage(EXIT_SUCCESS); break; 1734 case 'h': usage(EXIT_SUCCESS); break;
1082 case 'f': 1735 case 'f':
1083 if (from_file) err("Don't specify -f twice"); 1736 if (from_file) warn("You prob don't want to specify -f twice");
1084 from_file = xstrdup(optarg); 1737 from_file = optarg;
1738 break;
1739 case 'E':
1740 strncpy(match_etypes, optarg, sizeof(match_etypes));
1741 break;
1742 case 'M':
1743 match_bits = atoi(optarg);
1744 if (match_bits == 0) {
1745 if (strcmp(optarg, "ELFCLASS32") == 0)
1746 match_bits = 32;
1747 if (strcmp(optarg, "ELFCLASS64") == 0)
1748 match_bits = 64;
1749 }
1750 break;
1751 case 'O':
1752 if (sscanf(optarg, "%o", &match_perms) == -1)
1753 match_bits = 0;
1085 break; 1754 break;
1086 case 'o': { 1755 case 'o': {
1087 FILE *fp = NULL;
1088 if ((fp = freopen(optarg, "w", stdout)) == NULL) 1756 if (freopen(optarg, "w", stdout) == NULL)
1089 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 1757 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1090 SET_STDOUT(fp);
1091 break; 1758 break;
1092 } 1759 }
1093 1760 case 'k':
1761 if (find_section) warn("You prob don't want to specify -k twice");
1762 find_section = optarg;
1763 break;
1094 case 's': { 1764 case 's': {
1095 size_t len;
1096 if (find_sym) err("Don't specify -s twice"); 1765 if (find_sym) warn("You prob don't want to specify -s twice");
1097 find_sym = xstrdup(optarg); 1766 find_sym = optarg;
1098 len = strlen(find_sym) + 1;
1099 versioned_symname = (char*)xmalloc(sizeof(char) * (len+1));
1100 sprintf(versioned_symname, "%s@", find_sym);
1101 break; 1767 break;
1102 } 1768 }
1103 case 'N': { 1769 case 'N': {
1104 if (find_lib) err("Don't specify -N twice"); 1770 if (find_lib) warn("You prob don't want to specify -N twice");
1105 find_lib = xstrdup(optarg); 1771 find_lib = optarg;
1106 break; 1772 break;
1107 } 1773 }
1108 1774
1109 case 'F': { 1775 case 'F': {
1110 if (out_format) err("Don't specify -F twice"); 1776 if (out_format) warn("You prob don't want to specify -F twice");
1111 out_format = xstrdup(optarg); 1777 out_format = optarg;
1778 break;
1779 }
1780 case 'z': {
1781 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1782 size_t x;
1783
1784 for (x = 0; x < strlen(optarg); x++) {
1785 switch (optarg[x]) {
1786 case 'p':
1787 case 'P':
1788 do_pax_state(optarg[x], PAGEEXEC);
1112 break; 1789 break;
1790 case 's':
1791 case 'S':
1792 do_pax_state(optarg[x], SEGMEXEC);
1793 break;
1794 case 'm':
1795 case 'M':
1796 do_pax_state(optarg[x], MPROTECT);
1797 break;
1798 case 'e':
1799 case 'E':
1800 do_pax_state(optarg[x], EMUTRAMP);
1801 break;
1802 case 'r':
1803 case 'R':
1804 do_pax_state(optarg[x], RANDMMAP);
1805 break;
1806 case 'x':
1807 case 'X':
1808 do_pax_state(optarg[x], RANDEXEC);
1809 break;
1810 default:
1811 break;
1812 }
1113 } 1813 }
1114 1814 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
1815 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
1816 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
1817 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
1818 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1819 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1820 setpax = flags;
1821 break;
1822 }
1823 case 'Z': show_size = 1; break;
1115 case 'g': gmatch = 1; 1824 case 'g': g_match = 1; break;
1825 case 'L': use_ldcache = 1; break;
1116 case 'y': scan_symlink = 0; break; 1826 case 'y': scan_symlink = 0; break;
1827 case 'A': scan_archives = 1; break;
1117 case 'B': show_banner = 0; break; 1828 case 'B': show_banner = 0; break;
1118 case 'l': scan_ldpath = 1; break; 1829 case 'l': scan_ldpath = 1; break;
1119 case 'p': scan_envpath = 1; break; 1830 case 'p': scan_envpath = 1; break;
1120 case 'R': dir_recurse = 1; break; 1831 case 'R': dir_recurse = 1; break;
1121 case 'm': dir_crossmount = 0; break; 1832 case 'm': dir_crossmount = 0; break;
1833 case 'X': ++fix_elf; break;
1122 case 'x': show_pax = 1; break; 1834 case 'x': show_pax = 1; break;
1123 case 'e': show_phdr = 1; break; 1835 case 'e': show_phdr = 1; break;
1124 case 't': show_textrel = 1; break; 1836 case 't': show_textrel = 1; break;
1125 case 'r': show_rpath = 1; break; 1837 case 'r': show_rpath = 1; break;
1126 case 'n': show_needed = 1; break; 1838 case 'n': show_needed = 1; break;
1128 case 'b': show_bind = 1; break; 1840 case 'b': show_bind = 1; break;
1129 case 'S': show_soname = 1; break; 1841 case 'S': show_soname = 1; break;
1130 case 'T': show_textrels = 1; break; 1842 case 'T': show_textrels = 1; break;
1131 case 'q': be_quiet = 1; break; 1843 case 'q': be_quiet = 1; break;
1132 case 'v': be_verbose = (be_verbose % 20) + 1; break; 1844 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1133 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break; 1845 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
1134 1846 case 'D': show_endian = 1; break;
1847 case 'I': show_osabi = 1; break;
1848 case 'Y': show_eabi = 1; break;
1135 case ':': 1849 case ':':
1136 err("Option missing parameter\n"); 1850 err("Option '%c' is missing parameter", optopt);
1137 case '?': 1851 case '?':
1138 err("Unknown option\n"); 1852 err("Unknown option '%c' or argument missing", optopt);
1139 default: 1853 default:
1140 err("Unhandled option '%c'", i); 1854 err("Unhandled option '%c'; please report this", i);
1141 }
1142 } 1855 }
1143 1856 }
1857 if (show_textrels && be_verbose) {
1858 if (which("objdump") != NULL)
1859 has_objdump = 1;
1860 }
1144 /* let the format option override all other options */ 1861 /* let the format option override all other options */
1145 if (out_format) { 1862 if (out_format) {
1146 show_pax = show_phdr = show_textrel = show_rpath = \ 1863 show_pax = show_phdr = show_textrel = show_rpath = \
1147 show_needed = show_interp = show_bind = show_soname = \ 1864 show_needed = show_interp = show_bind = show_soname = \
1148 show_textrels = 0; 1865 show_textrels = show_perms = show_endian = show_size = \
1866 show_osabi = show_eabi = 0;
1149 for (i = 0; out_format[i]; ++i) { 1867 for (i = 0; out_format[i]; ++i) {
1150 if (!IS_MODIFIER(out_format[i])) continue; 1868 if (!IS_MODIFIER(out_format[i])) continue;
1151 1869
1152 switch (out_format[++i]) { 1870 switch (out_format[++i]) {
1871 case '+': break;
1153 case '%': break; 1872 case '%': break;
1154 case '#': break; 1873 case '#': break;
1155 case 'F': break; 1874 case 'F': break;
1156 case 'p': break; 1875 case 'p': break;
1157 case 'f': break; 1876 case 'f': break;
1877 case 'k': break;
1158 case 's': break; 1878 case 's': break;
1159 case 'N': break; 1879 case 'N': break;
1160 case 'o': break; 1880 case 'o': break;
1881 case 'a': break;
1882 case 'M': break;
1883 case 'Z': show_size = 1; break;
1884 case 'D': show_endian = 1; break;
1885 case 'I': show_osabi = 1; break;
1886 case 'Y': show_eabi = 1; break;
1887 case 'O': show_perms = 1; break;
1161 case 'x': show_pax = 1; break; 1888 case 'x': show_pax = 1; break;
1162 case 'e': show_phdr = 1; break; 1889 case 'e': show_phdr = 1; break;
1163 case 't': show_textrel = 1; break; 1890 case 't': show_textrel = 1; break;
1164 case 'r': show_rpath = 1; break; 1891 case 'r': show_rpath = 1; break;
1165 case 'n': show_needed = 1; break; 1892 case 'n': show_needed = 1; break;
1166 case 'i': show_interp = 1; break; 1893 case 'i': show_interp = 1; break;
1167 case 'b': show_bind = 1; break; 1894 case 'b': show_bind = 1; break;
1168 case 'S': show_soname = 1; break; 1895 case 'S': show_soname = 1; break;
1169 case 'T': show_textrels = 1; break; 1896 case 'T': show_textrels = 1; break;
1170 default: 1897 default:
1171 err("Invalid format specifier '%c' (byte %i)", 1898 err("Invalid format specifier '%c' (byte %i)",
1172 out_format[i], i+1); 1899 out_format[i], i+1);
1173 } 1900 }
1174 } 1901 }
1175 1902
1176 /* construct our default format */ 1903 /* construct our default format */
1177 } else { 1904 } else {
1178 size_t fmt_len = 30; 1905 size_t fmt_len = 30;
1179 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 1906 out_format = xmalloc(sizeof(char) * fmt_len);
1907 *out_format = '\0';
1180 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 1908 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1181 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len); 1909 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1910 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
1911 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
1912 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
1913 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
1914 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
1182 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len); 1915 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1183 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 1916 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1184 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 1917 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1185 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 1918 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1186 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 1919 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1187 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len); 1920 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1188 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len); 1921 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1189 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len); 1922 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1190 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len); 1923 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1924 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1191 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len); 1925 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1192 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 1926 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1193 } 1927 }
1194 if (be_verbose > 2) printf("Format: %s\n", out_format); 1928 if (be_verbose > 2) printf("Format: %s\n", out_format);
1195 1929
1196 /* now lets actually do the scanning */ 1930 /* now lets actually do the scanning */
1197 if (scan_ldpath || (show_rpath && be_quiet)) 1931 if (scan_ldpath || use_ldcache)
1198 load_ld_so_conf(); 1932 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
1199 if (scan_ldpath) scanelf_ldpath(); 1933 if (scan_ldpath) scanelf_ldpath();
1200 if (scan_envpath) scanelf_envpath(); 1934 if (scan_envpath) scanelf_envpath();
1935 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
1936 from_file = "-";
1201 if (from_file) { 1937 if (from_file) {
1202 scanelf_from_file(from_file); 1938 scanelf_from_file(from_file);
1203 free(from_file);
1204 from_file = *argv; 1939 from_file = *argv;
1205 } 1940 }
1206 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file) 1941 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1207 err("Nothing to scan !?"); 1942 err("Nothing to scan !?");
1208 while (optind < argc) { 1943 while (optind < argc) {
1209 search_path = argv[optind++]; 1944 search_path = argv[optind++];
1210 scanelf_dir(search_path); 1945 ret = scanelf_dir(search_path);
1211 } 1946 }
1212 1947
1213 /* clean up */ 1948 /* clean up */
1214 if (find_sym) {
1215 free(find_sym);
1216 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) 1949 for (i = 0; ldpaths[i]; ++i)
1221 free(ldpaths[i]); 1950 free(ldpaths[i]);
1222}
1223 1951
1224 1952 if (ldcache != 0)
1225 1953 munmap(ldcache, ldcache_size);
1226/* utility funcs */
1227static char *xstrdup(const char *s)
1228{
1229 char *ret = strdup(s);
1230 if (!ret) err("Could not strdup(): %s", strerror(errno));
1231 return ret; 1954 return ret;
1232} 1955}
1233 1956
1234static void *xmalloc(size_t size) 1957static char **get_split_env(const char *envvar)
1235{ 1958{
1236 void *ret = malloc(size); 1959 const char *delims = " \t\n";
1237 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size); 1960 char **envvals = NULL;
1238 return ret; 1961 char *env, *s;
1239} 1962 int nentry;
1240 1963
1241static void xstrcat(char **dst, const char *src, size_t *curr_len) 1964 if ((env = getenv(envvar)) == NULL)
1242{ 1965 return NULL;
1243 size_t new_len;
1244 1966
1245 new_len = strlen(*dst) + strlen(src); 1967 env = xstrdup(env);
1246 if (*curr_len <= new_len) { 1968 if (env == NULL)
1247 *curr_len = new_len + (*curr_len / 2); 1969 return NULL;
1248 *dst = realloc(*dst, *curr_len);
1249 if (!*dst)
1250 err("could not realloc %li bytes", (unsigned long)*curr_len);
1251 }
1252 1970
1253 strcat(*dst, src); 1971 s = strtok(env, delims);
1254} 1972 if (s == NULL) {
1973 free(env);
1974 return NULL;
1975 }
1255 1976
1256static inline void xchrcat(char **dst, const char append, size_t *curr_len) 1977 nentry = 0;
1257{ 1978 while (s != NULL) {
1258 static char my_app[2]; 1979 ++nentry;
1259 my_app[0] = append; 1980 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
1260 my_app[1] = '\0'; 1981 envvals[nentry-1] = s;
1261 xstrcat(dst, my_app, curr_len); 1982 s = strtok(NULL, delims);
1262} 1983 }
1984 envvals[nentry] = NULL;
1263 1985
1986 /* don't want to free(env) as it contains the memory that backs
1987 * the envvals array of strings */
1988 return envvals;
1989}
1264 1990
1991static void parseenv(void)
1992{
1993 qa_textrels = get_split_env("QA_TEXTRELS");
1994 qa_execstack = get_split_env("QA_EXECSTACK");
1995 qa_wx_load = get_split_env("QA_WX_LOAD");
1996}
1997
1998#ifdef __PAX_UTILS_CLEANUP
1999static void cleanup(void)
2000{
2001 free(out_format);
2002 free(qa_textrels);
2003 free(qa_execstack);
2004 free(qa_wx_load);
2005}
2006#endif
1265 2007
1266int main(int argc, char *argv[]) 2008int main(int argc, char *argv[])
1267{ 2009{
2010 int ret;
1268 if (argc < 2) 2011 if (argc < 2)
1269 usage(EXIT_FAILURE); 2012 usage(EXIT_FAILURE);
2013 parseenv();
1270 parseargs(argc, argv); 2014 ret = parseargs(argc, argv);
1271 fclose(stdout); 2015 fclose(stdout);
1272#ifdef __BOUNDS_CHECKING_ON 2016#ifdef __PAX_UTILS_CLEANUP
1273 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()"); 2017 cleanup();
2018 warn("The calls to add/delete heap should be off:\n"
2019 "\t- 1 due to the out_buffer not being freed in scanelf_file()\n"
2020 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
1274#endif 2021#endif
1275 return EXIT_SUCCESS; 2022 return ret;
1276} 2023}
2024
2025/* Match filename against entries in matchlist, return TRUE
2026 * if the file is listed */
2027static int file_matches_list(const char *filename, char **matchlist)
2028{
2029 char **file;
2030 char *match;
2031 char buf[__PAX_UTILS_PATH_MAX];
2032
2033 if (matchlist == NULL)
2034 return 0;
2035
2036 for (file = matchlist; *file != NULL; file++) {
2037 if (search_path) {
2038 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2039 match = buf;
2040 } else {
2041 match = *file;
2042 }
2043 if (fnmatch(match, filename, 0) == 0)
2044 return 1;
2045 }
2046 return 0;
2047}

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