/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.88 Revision 1.203
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 1.203 2008/12/30 12:39:53 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 1.203 2008/12/30 12:39:53 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
81static char *getstr_perms(const char *fname);
82static char *getstr_perms(const char *fname)
83{
84 struct stat st;
85 static char buf[8];
86
87 if ((stat(fname, &st)) == (-1))
88 return (char *) "";
89
90 snprintf(buf, sizeof(buf), "%o", st.st_mode);
91
92 return (char *) buf + 2;
93}
94
95/* find the path to a file by name */
96static char *which(const char *fname)
97{
98 static char fullpath[BUFSIZ];
99 char *path, *p;
100
101 path = getenv("PATH");
102 if (!path)
103 return NULL;
104
105 path = xstrdup(path);
106 while ((p = strrchr(path, ':')) != NULL) {
107 snprintf(fullpath, sizeof(fullpath), "%s/%s", p + 1, fname);
108 *p = 0;
109 if (access(fullpath, R_OK) != (-1)) {
110 free(path);
111 return (char *) fullpath;
112 }
113 }
114 free(path);
115 return NULL;
116}
117
118/* 1 on failure. 0 otherwise */
119static int rematch(const char *regex, const char *match, int cflags)
120{
121 regex_t preg;
122 int ret;
123
124 if ((match == NULL) || (regex == NULL))
125 return EXIT_FAILURE;
126
127 if ((ret = regcomp(&preg, regex, cflags))) {
128 char err[256];
129
130 if (regerror(ret, &preg, err, sizeof(err)))
131 fprintf(stderr, "regcomp failed: %s", err);
132 else
133 fprintf(stderr, "regcomp failed");
134
135 return EXIT_FAILURE;
136 }
137 ret = regexec(&preg, match, 0, NULL, 0);
138 regfree(&preg);
139
140 return ret;
141}
70 142
71/* sub-funcs for scanelf_file() */ 143/* sub-funcs for scanelf_file() */
72static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab) 144static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
73{ 145{
74 /* find the best SHT_DYNSYM and SHT_STRTAB sections */ 146 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
93 } \ 165 } \
94 } 166 }
95 GET_SYMTABS(32) 167 GET_SYMTABS(32)
96 GET_SYMTABS(64) 168 GET_SYMTABS(64)
97} 169}
170
98static char *scanelf_file_pax(elfobj *elf, char *found_pax) 171static char *scanelf_file_pax(elfobj *elf, char *found_pax)
99{ 172{
100 static char *paxflags;
101 static char ret[7]; 173 static char ret[7];
102 unsigned long i, shown; 174 unsigned long i, shown;
103 175
104 if (!show_pax) return NULL; 176 if (!show_pax) return NULL;
105 177
112 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 184 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
113 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 185 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
114 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 186 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
115 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \ 187 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
116 continue; \ 188 continue; \
117 if (be_quiet && (EGET(phdr[i].p_flags) == 10240)) \ 189 if (fix_elf && setpax) { \
190 /* set the paxctl flags */ \
191 ESET(phdr[i].p_flags, setpax); \
192 } \
193 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
118 continue; \ 194 continue; \
119 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \ 195 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
120 *found_pax = 1; \ 196 *found_pax = 1; \
121 ++shown; \ 197 ++shown; \
122 break; \ 198 break; \
124 } 200 }
125 SHOW_PAX(32) 201 SHOW_PAX(32)
126 SHOW_PAX(64) 202 SHOW_PAX(64)
127 } 203 }
128 204
205 if (fix_elf && setpax) {
206 /* set the chpax settings */
207 if (elf->elf_class == ELFCLASS32) {
208 if (EHDR32(elf->ehdr)->e_type == ET_DYN || EHDR32(elf->ehdr)->e_type == ET_EXEC)
209 ESET(EHDR32(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
210 } else {
211 if (EHDR64(elf->ehdr)->e_type == ET_DYN || EHDR64(elf->ehdr)->e_type == ET_EXEC)
212 ESET(EHDR64(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
213 }
214 }
215
129 /* fall back to EI_PAX if no PT_PAX was found */ 216 /* fall back to EI_PAX if no PT_PAX was found */
130 if (!*ret) { 217 if (!*ret) {
218 static char *paxflags;
131 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf)); 219 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
132 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) { 220 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
133 *found_pax = 1; 221 *found_pax = 1;
134 return paxflags; 222 return (be_wewy_wewy_quiet ? NULL : paxflags);
135 } 223 }
136 strncpy(ret, paxflags, sizeof(ret)); 224 strncpy(ret, paxflags, sizeof(ret));
137 } 225 }
138 226
139 if (be_quiet && !shown) 227 if (be_wewy_wewy_quiet || (be_quiet && !shown))
140 return NULL; 228 return NULL;
229 else
141 return ret; 230 return ret;
142
143} 231}
232
144static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load) 233static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
145{ 234{
146 static char ret[12]; 235 static char ret[12];
147 char *found; 236 char *found;
148 unsigned long i, off, shown, check_flags;
149 unsigned char multi_stack, multi_relro, multi_load; 237 unsigned long i, shown, multi_stack, multi_relro, multi_load;
238 int max_pt_load;
150 239
151 if (!show_phdr) return NULL; 240 if (!show_phdr) return NULL;
152 241
153 memcpy(ret, "--- --- ---\0", 12); 242 memcpy(ret, "--- --- ---\0", 12);
154 243
155 shown = 0; 244 shown = 0;
156 multi_stack = multi_relro = multi_load = 0; 245 multi_stack = multi_relro = multi_load = 0;
246 max_pt_load = elf_max_pt_load(elf);
157 247
158 if (elf->phdr) { 248#define NOTE_GNU_STACK ".note.GNU-stack"
159#define SHOW_PHDR(B) \ 249#define SHOW_PHDR(B) \
160 if (elf->elf_class == ELFCLASS ## B) { \ 250 if (elf->elf_class == ELFCLASS ## B) { \
161 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 251 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
252 Elf ## B ## _Off offset; \
253 uint32_t flags, check_flags; \
254 if (elf->phdr != NULL) { \
162 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 255 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
163 uint32_t flags; \
164 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 256 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
165 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \ 257 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
258 if (multi_stack++) \
166 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \ 259 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
260 if (file_matches_list(elf->filename, qa_execstack)) \
261 continue; \
167 found = found_phdr; \ 262 found = found_phdr; \
168 off = 0; \ 263 offset = 0; \
169 check_flags = PF_X; \ 264 check_flags = PF_X; \
170 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \ 265 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
266 if (multi_relro++) \
171 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \ 267 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
172 found = found_relro; \ 268 found = found_relro; \
173 off = 4; \ 269 offset = 4; \
174 check_flags = PF_X; \ 270 check_flags = PF_X; \
175 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \ 271 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
176 if (multi_load++ > 2) warnf("%s: more than 2 PT_LOAD's !?", elf->filename); \ 272 if (EGET(ehdr->e_type) == ET_DYN || EGET(ehdr->e_type) == ET_EXEC) \
273 if (multi_load++ > max_pt_load) \
274 warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
275 if (file_matches_list(elf->filename, qa_wx_load)) \
276 continue; \
177 found = found_load; \ 277 found = found_load; \
178 off = 8; \ 278 offset = 8; \
179 check_flags = PF_W|PF_X; \ 279 check_flags = PF_W|PF_X; \
180 } else \ 280 } else \
181 continue; \ 281 continue; \
182 flags = EGET(phdr[i].p_flags); \ 282 flags = EGET(phdr[i].p_flags); \
183 if (be_quiet && ((flags & check_flags) != check_flags)) \ 283 if (be_quiet && ((flags & check_flags) != check_flags)) \
184 continue; \ 284 continue; \
285 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
286 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
287 ret[3] = ret[7] = '!'; \
288 flags = EGET(phdr[i].p_flags); \
289 } \
185 memcpy(ret+off, gnu_short_stack_flags(flags), 3); \ 290 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
186 *found = 1; \ 291 *found = 1; \
187 ++shown; \ 292 ++shown; \
293 } \
294 } else if (elf->shdr != NULL) { \
295 /* no program headers which means this is prob an object file */ \
296 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
297 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
298 char *str; \
299 if ((void*)strtbl > (void*)elf->data_end) \
300 goto skip_this_shdr##B; \
301 check_flags = SHF_WRITE|SHF_EXECINSTR; \
302 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
303 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
304 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
305 str = elf->data + offset; \
306 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
307 if (!strcmp(str, NOTE_GNU_STACK)) { \
308 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
309 flags = EGET(shdr[i].sh_flags); \
310 if (be_quiet && ((flags & check_flags) != check_flags)) \
311 continue; \
312 ++*found_phdr; \
313 shown = 1; \
314 if (flags & SHF_WRITE) ret[0] = 'W'; \
315 if (flags & SHF_ALLOC) ret[1] = 'A'; \
316 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
317 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
318 break; \
319 } \
320 } \
321 skip_this_shdr##B: \
322 if (!multi_stack) { \
323 if (file_matches_list(elf->filename, qa_execstack)) \
324 return NULL; \
325 *found_phdr = 1; \
326 shown = 1; \
327 memcpy(ret, "!WX", 3); \
328 } \
188 } \ 329 } \
189 } 330 }
190 SHOW_PHDR(32) 331 SHOW_PHDR(32)
191 SHOW_PHDR(64) 332 SHOW_PHDR(64)
192 }
193 333
194 if (be_quiet && !shown) 334 if (be_wewy_wewy_quiet || (be_quiet && !shown))
195 return NULL; 335 return NULL;
196 else 336 else
197 return ret; 337 return ret;
198} 338}
339
340/*
341 * See if this ELF contains a DT_TEXTREL tag in any of its
342 * PT_DYNAMIC sections.
343 */
199static char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 344static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
200{ 345{
201 static char ret[] = "TEXTREL"; 346 static const char *ret = "TEXTREL";
202 unsigned long i; 347 unsigned long i;
203 348
204 if (!show_textrel && !show_textrels) return NULL; 349 if (!show_textrel && !show_textrels) return NULL;
350
351 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
205 352
206 if (elf->phdr) { 353 if (elf->phdr) {
207#define SHOW_TEXTREL(B) \ 354#define SHOW_TEXTREL(B) \
208 if (elf->elf_class == ELFCLASS ## B) { \ 355 if (elf->elf_class == ELFCLASS ## B) { \
209 Elf ## B ## _Dyn *dyn; \ 356 Elf ## B ## _Dyn *dyn; \
210 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 357 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
211 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 358 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
212 Elf ## B ## _Off offset; \ 359 Elf ## B ## _Off offset; \
213 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 360 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
214 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 361 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
215 offset = EGET(phdr[i].p_offset); \ 362 offset = EGET(phdr[i].p_offset); \
216 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 363 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
217 dyn = DYN ## B (elf->data + offset); \ 364 dyn = DYN ## B (elf->data + offset); \
218 while (EGET(dyn->d_tag) != DT_NULL) { \ 365 while (EGET(dyn->d_tag) != DT_NULL) { \
219 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \ 366 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
229 } 376 }
230 377
231 if (be_quiet || be_wewy_wewy_quiet) 378 if (be_quiet || be_wewy_wewy_quiet)
232 return NULL; 379 return NULL;
233 else 380 else
234 return (char *)" - "; 381 return " - ";
235} 382}
383
384/*
385 * Scan the .text section to see if there are any relocations in it.
386 * Should rewrite this to check PT_LOAD sections that are marked
387 * Executable rather than the section named '.text'.
388 */
236static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel) 389static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
237{ 390{
238 unsigned long s, r, rmax; 391 unsigned long s, r, rmax;
239 void *symtab_void, *strtab_void, *text_void; 392 void *symtab_void, *strtab_void, *text_void;
240 393
292 if (be_verbose <= 2) continue; \ 445 if (be_verbose <= 2) continue; \
293 } else \ 446 } else \
294 *found_textrels = 1; \ 447 *found_textrels = 1; \
295 /* locate this relocation symbol name */ \ 448 /* locate this relocation symbol name */ \
296 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 449 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
450 if ((void*)sym > (void*)elf->data_end) { \
451 warn("%s: corrupt ELF symbol", elf->filename); \
452 continue; \
453 } \
297 sym_max = ELF ## B ## _R_SYM(r_info); \ 454 sym_max = ELF ## B ## _R_SYM(r_info); \
298 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \ 455 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
299 sym += sym_max; \ 456 sym += sym_max; \
300 else \ 457 else \
301 sym = NULL; \ 458 sym = NULL; \
303 /* show the raw details about this reloc */ \ 460 /* show the raw details about this reloc */ \
304 printf(" %s: ", elf->base_filename); \ 461 printf(" %s: ", elf->base_filename); \
305 if (sym && sym->st_name) \ 462 if (sym && sym->st_name) \
306 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \ 463 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \
307 else \ 464 else \
308 printf("(memory/fake?)"); \ 465 printf("(memory/data?)"); \
309 printf(" [0x%lX]", (unsigned long)r_offset); \ 466 printf(" [0x%lX]", (unsigned long)r_offset); \
310 /* now try to find the closest symbol that this rel is probably in */ \ 467 /* now try to find the closest symbol that this rel is probably in */ \
311 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 468 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
312 func = NULL; \ 469 func = NULL; \
313 offset_tmp = 0; \ 470 offset_tmp = 0; \
317 offset_tmp = EGET(sym->st_value); \ 474 offset_tmp = EGET(sym->st_value); \
318 } \ 475 } \
319 ++sym; \ 476 ++sym; \
320 } \ 477 } \
321 printf(" in "); \ 478 printf(" in "); \
322 if (func && func->st_name) \ 479 if (func && func->st_name) { \
323 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \ 480 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
481 if (r_offset > EGET(func->st_size)) \
482 printf("(optimized out: previous %s)", func_name); \
324 else \ 483 else \
325 printf("(NULL: fake?)"); \ 484 printf("%s", func_name); \
485 } else \
486 printf("(optimized out)"); \
326 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \ 487 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
488 if (be_verbose && has_objdump) { \
489 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
490 char *sysbuf; \
491 size_t syslen; \
492 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"; \
493 syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
494 sysbuf = xmalloc(syslen); \
495 if (end_addr < r_offset) \
496 /* not uncommon when things are optimized out */ \
497 end_addr = r_offset + 0x100; \
498 snprintf(sysbuf, syslen, sysfmt, \
499 (unsigned long)offset_tmp, \
500 (unsigned long)end_addr, \
501 elf->filename, \
502 (unsigned long)r_offset); \
503 fflush(stdout); \
504 system(sysbuf); \
505 fflush(stdout); \
506 free(sysbuf); \
507 } \
327 } \ 508 } \
328 } } 509 } }
329 SHOW_TEXTRELS(32) 510 SHOW_TEXTRELS(32)
330 SHOW_TEXTRELS(64) 511 SHOW_TEXTRELS(64)
331 } 512 }
333 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename); 514 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
334 515
335 return NULL; 516 return NULL;
336} 517}
337 518
338static void rpath_security_checks(elfobj *, char *); 519static void rpath_security_checks(elfobj *, char *, const char *);
339static void rpath_security_checks(elfobj *elf, char *item) { 520static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
521{
340 struct stat st; 522 struct stat st;
341 switch (*item) { 523 switch (*item) {
342 case 0:
343 warnf("Security problem NULL RPATH in %s", elf->filename);
344 break;
345 case '/': break; 524 case '/': break;
525 case '.':
526 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
527 break;
528 case ':':
529 case '\0':
530 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
531 break;
346 case '$': 532 case '$':
347 if (fstat(elf->fd, &st) != -1) 533 if (fstat(elf->fd, &st) != -1)
348 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID)) 534 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", 535 warnf("Security problem with %s='%s' in %s with mode set of %o",
350 item, elf->filename, st.st_mode & 07777); 536 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
351 break; 537 break;
352 default: 538 default:
353 warnf("Maybe? sec problem with RPATH='%s' in %s", item, elf->filename); 539 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
354 break; 540 break;
355 } 541 }
356} 542}
357static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len) 543static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
358{ 544{
375 Elf ## B ## _Off offset; \ 561 Elf ## B ## _Off offset; \
376 Elf ## B ## _Xword word; \ 562 Elf ## B ## _Xword word; \
377 /* Scan all the program headers */ \ 563 /* Scan all the program headers */ \
378 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 564 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
379 /* Just scan dynamic headers */ \ 565 /* Just scan dynamic headers */ \
380 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 566 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
381 offset = EGET(phdr[i].p_offset); \ 567 offset = EGET(phdr[i].p_offset); \
382 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 568 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
383 /* Just scan dynamic RPATH/RUNPATH headers */ \ 569 /* Just scan dynamic RPATH/RUNPATH headers */ \
384 dyn = DYN ## B (elf->data + offset); \ 570 dyn = DYN ## B (elf->data + offset); \
385 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \ 571 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
394 /* Verify the memory is somewhat sane */ \ 580 /* Verify the memory is somewhat sane */ \
395 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 581 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
396 if (offset < (Elf ## B ## _Off)elf->len) { \ 582 if (offset < (Elf ## B ## _Off)elf->len) { \
397 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \ 583 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
398 *r = (char*)(elf->data + offset); \ 584 *r = (char*)(elf->data + offset); \
585 /* cache the length in case we need to nuke this section later on */ \
586 if (fix_elf) \
587 offset = strlen(*r); \
399 /* If quiet, don't output paths in ld.so.conf */ \ 588 /* If quiet, don't output paths in ld.so.conf */ \
400 if (be_quiet) { \ 589 if (be_quiet) { \
401 size_t len; \ 590 size_t len; \
402 char *start, *end; \ 591 char *start, *end; \
403 /* note that we only 'chop' off leading known paths. */ \ 592 /* note that we only 'chop' off leading known paths. */ \
404 /* since *r is read-only memory, we can only move the ptr forward. */ \ 593 /* since *r is read-only memory, we can only move the ptr forward. */ \
405 start = *r; \ 594 start = *r; \
406 /* scan each path in : delimited list */ \ 595 /* scan each path in : delimited list */ \
407 while (start) { \ 596 while (start) { \
408 rpath_security_checks(elf, start); \ 597 rpath_security_checks(elf, start, get_elfdtype(word)); \
409 end = strchr(start, ':'); \ 598 end = strchr(start, ':'); \
410 len = (end ? abs(end - start) : strlen(start)); \ 599 len = (end ? abs(end - start) : strlen(start)); \
600 if (use_ldcache) \
411 for (s = 0; ldpaths[s]; ++s) { \ 601 for (s = 0; ldpaths[s]; ++s) \
412 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \ 602 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
413 *r = (end ? end + 1 : NULL); \ 603 *r = end; \
604 /* corner case ... if RPATH reads "/usr/lib:", we want \
605 * to show ':' rather than '' */ \
606 if (end && end[1] != '\0') \
607 (*r)++; \
414 break; \ 608 break; \
415 } \ 609 } \
416 } \
417 if (!*r || !ldpaths[s] || !end) \ 610 if (!*r || !end) \
418 start = NULL; \ 611 break; \
419 else \ 612 else \
420 start = start + len + 1; \ 613 start = start + len + 1; \
421 } \ 614 } \
422 } \ 615 } \
616 if (*r) { \
617 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
618 /* just nuke it */ \
619 nuke_it##B: \
620 memset(*r, 0x00, offset); \
621 *r = NULL; \
622 ESET(dyn->d_tag, DT_DEBUG); \
623 ESET(dyn->d_un.d_ptr, 0); \
624 } else if (fix_elf) { \
625 /* try to clean "bad" paths */ \
626 size_t len, tmpdir_len; \
627 char *start, *end; \
628 const char *tmpdir; \
629 start = *r; \
630 tmpdir = (getenv("TMPDIR") ? : "."); \
631 tmpdir_len = strlen(tmpdir); \
632 while (1) { \
633 end = strchr(start, ':'); \
634 if (start == end) { \
635 eat_this_path##B: \
636 len = strlen(end); \
637 memmove(start, end+1, len); \
638 start[len-1] = '\0'; \
639 end = start - 1; \
640 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
641 if (!end) { \
642 if (start == *r) \
643 goto nuke_it##B; \
644 *--start = '\0'; \
645 } else \
646 goto eat_this_path##B; \
647 } \
648 if (!end) \
649 break; \
650 start = end + 1; \
651 } \
652 if (**r == '\0') \
653 goto nuke_it##B; \
654 } \
655 if (*r) \
423 if (*r) *found_rpath = 1; \ 656 *found_rpath = 1; \
657 } \
424 } \ 658 } \
425 ++dyn; \ 659 ++dyn; \
426 } \ 660 } \
427 } } 661 } }
428 SHOW_RPATH(32) 662 SHOW_RPATH(32)
445 } else if (rpath || runpath) 679 } else if (rpath || runpath)
446 xstrcat(ret, (runpath ? runpath : rpath), ret_len); 680 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
447 else if (!be_quiet) 681 else if (!be_quiet)
448 xstrcat(ret, " - ", ret_len); 682 xstrcat(ret, " - ", ret_len);
449} 683}
684
685#define LDSO_CACHE_MAGIC "ld.so-"
686#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
687#define LDSO_CACHE_VER "1.7.0"
688#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
689#define FLAG_ANY -1
690#define FLAG_TYPE_MASK 0x00ff
691#define FLAG_LIBC4 0x0000
692#define FLAG_ELF 0x0001
693#define FLAG_ELF_LIBC5 0x0002
694#define FLAG_ELF_LIBC6 0x0003
695#define FLAG_REQUIRED_MASK 0xff00
696#define FLAG_SPARC_LIB64 0x0100
697#define FLAG_IA64_LIB64 0x0200
698#define FLAG_X8664_LIB64 0x0300
699#define FLAG_S390_LIB64 0x0400
700#define FLAG_POWERPC_LIB64 0x0500
701#define FLAG_MIPS64_LIBN32 0x0600
702#define FLAG_MIPS64_LIBN64 0x0700
703
704static char *lookup_cache_lib(elfobj *, char *);
705
706#if defined(__GLIBC__) || defined(__UCLIBC__)
707
708static char *lookup_cache_lib(elfobj *elf, char *fname)
709{
710 int fd = 0;
711 char *strs;
712 static char buf[__PAX_UTILS_PATH_MAX] = "";
713 const char *cachefile = "/etc/ld.so.cache";
714 struct stat st;
715
716 typedef struct {
717 char magic[LDSO_CACHE_MAGIC_LEN];
718 char version[LDSO_CACHE_VER_LEN];
719 int nlibs;
720 } header_t;
721 header_t *header;
722
723 typedef struct {
724 int flags;
725 int sooffset;
726 int liboffset;
727 } libentry_t;
728 libentry_t *libent;
729
730 if (fname == NULL)
731 return NULL;
732
733 if (ldcache == 0) {
734 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1)
735 return NULL;
736
737 /* cache these values so we only map/unmap the cache file once */
738 ldcache_size = st.st_size;
739 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
740
741 close(fd);
742
743 if (ldcache == MAP_FAILED) {
744 ldcache = 0;
745 return NULL;
746 }
747
748 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
749 return NULL;
750 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
751 return NULL;
752 }
753
754 header = (header_t *) ldcache;
755 libent = (libentry_t *) (ldcache + sizeof(header_t));
756 strs = (char *) &libent[header->nlibs];
757
758 for (fd = 0; fd < header->nlibs; fd++) {
759 /* this should be more fine grained, but for now we assume that
760 * diff arches will not be cached together. and we ignore the
761 * the different multilib mips cases. */
762 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
763 continue;
764 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
765 continue;
766
767 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
768 continue;
769 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
770 }
771 return buf;
772}
773#elif defined(__NetBSD__)
774static char *lookup_cache_lib(elfobj *elf, char *fname)
775{
776 static char buf[__PAX_UTILS_PATH_MAX] = "";
777 static struct stat st;
778
779 char **ldpath;
780 for (ldpath = ldpaths; *ldpath != NULL; ldpath++) {
781 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", *ldpath, fname) >= sizeof(buf))
782 continue; /* if the pathname is too long, or something went wrong, ignore */
783
784 if (stat(buf, &st) != 0)
785 continue; /* if the lib doesn't exist in *ldpath, look further */
786
787 /* NetBSD doesn't actually do sanity checks, it just loads the file
788 * and if that doesn't work, continues looking in other directories.
789 * This cannot easily be safely emulated, unfortunately. For now,
790 * just assume that if it exists, it's a valid library. */
791
792 return buf;
793 }
794
795 /* not found in any path */
796 return NULL;
797}
798#else
799#ifdef __ELF__
800#warning Cache support not implemented for your target
801#endif
802static char *lookup_cache_lib(elfobj *elf, char *fname)
803{
804 return NULL;
805}
806#endif
807
450static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len) 808static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
451{ 809{
452 unsigned long i; 810 unsigned long i;
453 char *needed; 811 char *needed;
454 void *strtbl_void; 812 void *strtbl_void;
813 char *p;
455 814
456 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL; 815 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
457 816
458 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 817 strtbl_void = elf_findsecbyname(elf, ".dynstr");
459 818
464 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 823 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
465 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 824 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
466 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 825 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
467 Elf ## B ## _Off offset; \ 826 Elf ## B ## _Off offset; \
468 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 827 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
469 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 828 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
470 offset = EGET(phdr[i].p_offset); \ 829 offset = EGET(phdr[i].p_offset); \
471 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 830 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
472 dyn = DYN ## B (elf->data + offset); \ 831 dyn = DYN ## B (elf->data + offset); \
473 while (EGET(dyn->d_tag) != DT_NULL) { \ 832 while (EGET(dyn->d_tag) != DT_NULL) { \
474 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 833 if (EGET(dyn->d_tag) == DT_NEEDED) { \
479 } \ 838 } \
480 needed = (char*)(elf->data + offset); \ 839 needed = (char*)(elf->data + offset); \
481 if (op == 0) { \ 840 if (op == 0) { \
482 if (!be_wewy_wewy_quiet) { \ 841 if (!be_wewy_wewy_quiet) { \
483 if (*found_needed) xchrcat(ret, ',', ret_len); \ 842 if (*found_needed) xchrcat(ret, ',', ret_len); \
843 if (use_ldcache) \
844 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
845 needed = p; \
484 xstrcat(ret, needed, ret_len); \ 846 xstrcat(ret, needed, ret_len); \
485 } \ 847 } \
486 *found_needed = 1; \ 848 *found_needed = 1; \
487 } else { \ 849 } else { \
488 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \ 850 if (!strncmp(find_lib, needed, strlen( !g_match ? needed : find_lib))) { \
489 *found_lib = 1; \ 851 *found_lib = 1; \
490 return (be_wewy_wewy_quiet ? NULL : needed); \ 852 return (be_wewy_wewy_quiet ? NULL : needed); \
491 } \ 853 } \
492 } \ 854 } \
493 } \ 855 } \
524} 886}
525static char *scanelf_file_bind(elfobj *elf, char *found_bind) 887static char *scanelf_file_bind(elfobj *elf, char *found_bind)
526{ 888{
527 unsigned long i; 889 unsigned long i;
528 struct stat s; 890 struct stat s;
891 char dynamic = 0;
529 892
530 if (!show_bind) return NULL; 893 if (!show_bind) return NULL;
531 if (!elf->phdr) return NULL; 894 if (!elf->phdr) return NULL;
532 895
533#define SHOW_BIND(B) \ 896#define SHOW_BIND(B) \
535 Elf ## B ## _Dyn *dyn; \ 898 Elf ## B ## _Dyn *dyn; \
536 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 899 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
537 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 900 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
538 Elf ## B ## _Off offset; \ 901 Elf ## B ## _Off offset; \
539 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 902 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
540 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 903 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
904 dynamic = 1; \
541 offset = EGET(phdr[i].p_offset); \ 905 offset = EGET(phdr[i].p_offset); \
542 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 906 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
543 dyn = DYN ## B (elf->data + offset); \ 907 dyn = DYN ## B (elf->data + offset); \
544 while (EGET(dyn->d_tag) != DT_NULL) { \ 908 while (EGET(dyn->d_tag) != DT_NULL) { \
545 if (EGET(dyn->d_tag) == DT_BIND_NOW || \ 909 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
556 SHOW_BIND(32) 920 SHOW_BIND(32)
557 SHOW_BIND(64) 921 SHOW_BIND(64)
558 922
559 if (be_wewy_wewy_quiet) return NULL; 923 if (be_wewy_wewy_quiet) return NULL;
560 924
925 /* 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)) { 926 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
562 return NULL; 927 return NULL;
563 } else { 928 } else {
564 *found_bind = 1; 929 *found_bind = 1;
565 return (char *) "LAZY"; 930 return (char *) (dynamic ? "LAZY" : "STATIC");
566 } 931 }
567} 932}
568static char *scanelf_file_soname(elfobj *elf, char *found_soname) 933static char *scanelf_file_soname(elfobj *elf, char *found_soname)
569{ 934{
570 unsigned long i; 935 unsigned long i;
582 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 947 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
583 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 948 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
584 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 949 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
585 Elf ## B ## _Off offset; \ 950 Elf ## B ## _Off offset; \
586 /* only look for soname in shared objects */ \ 951 /* only look for soname in shared objects */ \
587 if (ehdr->e_type != ET_DYN) \ 952 if (EGET(ehdr->e_type) != ET_DYN) \
588 return NULL; \ 953 return NULL; \
589 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 954 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
590 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 955 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
591 offset = EGET(phdr[i].p_offset); \ 956 offset = EGET(phdr[i].p_offset); \
592 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 957 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
593 dyn = DYN ## B (elf->data + offset); \ 958 dyn = DYN ## B (elf->data + offset); \
594 while (EGET(dyn->d_tag) != DT_NULL) { \ 959 while (EGET(dyn->d_tag) != DT_NULL) { \
595 if (EGET(dyn->d_tag) == DT_SONAME) { \ 960 if (EGET(dyn->d_tag) == DT_SONAME) { \
609 SHOW_SONAME(64) 974 SHOW_SONAME(64)
610 } 975 }
611 976
612 return NULL; 977 return NULL;
613} 978}
979
980static int scanelf_match_symname(const char *symname, const char *tomatch) {
981 /* We do things differently when checking with regexp */
982 if (g_match) {
983 return rematch(symname, tomatch, REG_EXTENDED) == 0;
984 } else {
985 const size_t symname_len = strlen(symname);
986 return (strncmp(symname, tomatch, symname_len) == 0 &&
987 /* Accept unversioned symbol names */
988 (tomatch[symname_len] == '\0' || tomatch[symname_len] == '@'));
989 }
990}
991
614static char *scanelf_file_sym(elfobj *elf, char *found_sym) 992static char *scanelf_file_sym(elfobj *elf, char *found_sym)
615{ 993{
616 unsigned long i; 994 unsigned long i;
995 char *ret;
617 void *symtab_void, *strtab_void; 996 void *symtab_void, *strtab_void;
618 997
619 if (!find_sym) return NULL; 998 if (!find_sym) return NULL;
999 ret = find_sym;
620 1000
621 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void); 1001 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
622 1002
623 if (symtab_void && strtab_void) { 1003 if (symtab_void && strtab_void) {
624#define FIND_SYM(B) \ 1004#define FIND_SYM(B) \
625 if (elf->elf_class == ELFCLASS ## B) { \ 1005 if (elf->elf_class == ELFCLASS ## B) { \
626 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 1006 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
627 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 1007 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
628 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 1008 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
629 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 1009 unsigned long cnt = EGET(symtab->sh_entsize); \
630 char *symname; \ 1010 char *symname; \
1011 if (cnt) \
1012 cnt = EGET(symtab->sh_size) / cnt; \
631 for (i = 0; i < cnt; ++i) { \ 1013 for (i = 0; i < cnt; ++i) { \
1014 if ((void*)sym > (void*)elf->data_end) { \
1015 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1016 goto break_out; \
1017 } \
632 if (sym->st_name) { \ 1018 if (sym->st_name) { \
1019 /* make sure the symbol name is in acceptable memory range */ \
633 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 1020 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
634 if (*find_sym == '*') { \ 1021 if ((void*)symname > (void*)elf->data_end) { \
1022 warnf("%s: corrupt ELF symbols", elf->filename); \
1023 ++sym; \
1024 continue; \
1025 } \
1026 /* debug display ... show all symbols and some extra info */ \
1027 if (0 && g_match ? rematch(ret, symname, REG_EXTENDED) == 0 : *ret == '*') { \
635 printf("%s(%s) %5lX %15s %s\n", \ 1028 printf("%s(%s) %5lX %15s %s %s\n", \
636 ((*found_sym == 0) ? "\n\t" : "\t"), \ 1029 ((*found_sym == 0) ? "\n\t" : "\t"), \
637 elf->base_filename, \ 1030 elf->base_filename, \
638 (long)sym->st_size, \ 1031 (unsigned long)sym->st_size, \
639 (char *)get_elfstttype(sym->st_info), \ 1032 get_elfstttype(sym->st_info), \
640 symname); \ 1033 sym->st_shndx == SHN_UNDEF ? "U" : "D", symname); \
641 *found_sym = 1; \ 1034 *found_sym = 1; \
642 } else if ((strcmp(find_sym, symname) == 0) || \ 1035 } else { \
643 (strcmp(symname, versioned_symname) == 0)) \ 1036 /* allow the user to specify a comma delimited list of symbols to search for */ \
1037 char *this_sym, *next_sym; \
1038 next_sym = ret; \
1039 while (next_sym) { \
1040 this_sym = next_sym; \
1041 if ((next_sym = strchr(this_sym, ','))) \
1042 next_sym += 1; /* Skip the comma */ \
1043 /* do we want a defined symbol ? */ \
1044 if (*this_sym == '+') { \
1045 if (sym->st_shndx == SHN_UNDEF) \
1046 continue; \
1047 ++this_sym; \
1048 /* do we want an undefined symbol ? */ \
1049 } else if (*this_sym == '-') { \
1050 if (sym->st_shndx != SHN_UNDEF) \
1051 continue; \
1052 ++this_sym; \
1053 } \
1054 if (next_sym) /* Copy it so that we don't have to worry about the final , */ \
1055 this_sym = strndup(this_sym, next_sym-this_sym); \
1056 /* ok, lets compare the name now */ \
1057 if (scanelf_match_symname(this_sym, symname)) { \
1058 if (be_semi_verbose) { \
1059 char buf[126]; \
1060 snprintf(buf, sizeof(buf), "%lX %s %s", \
1061 (unsigned long)sym->st_size, get_elfstttype(sym->st_info), this_sym); \
1062 ret = buf; \
1063 } else \
1064 ret = symname; \
644 (*found_sym)++; \ 1065 (*found_sym)++; \
1066 goto break_out; \
1067 } \
1068 if (next_sym) free(this_sym); \
1069 } \
1070 } \
645 } \ 1071 } \
646 ++sym; \ 1072 ++sym; \
647 } } 1073 } }
648 FIND_SYM(32) 1074 FIND_SYM(32)
649 FIND_SYM(64) 1075 FIND_SYM(64)
650 } 1076 }
651 1077
1078break_out:
652 if (be_wewy_wewy_quiet) return NULL; 1079 if (be_wewy_wewy_quiet) return NULL;
653 1080
654 if (*find_sym != '*' && *found_sym) 1081 if (*find_sym != '*' && *found_sym)
655 return find_sym; 1082 return ret;
656 if (be_quiet) 1083 if (be_quiet)
657 return NULL; 1084 return NULL;
658 else 1085 else
659 return (char *)" - "; 1086 return (char *)" - ";
660} 1087}
1088
1089static char *scanelf_file_sections(elfobj *elf, char *found_section)
1090{
1091 if (!find_section)
1092 return NULL;
1093
1094#define FIND_SECTION(B) \
1095 if (elf->elf_class == ELFCLASS ## B) { \
1096 int invert; \
1097 Elf ## B ## _Shdr *section; \
1098 invert = (*find_section == '!' ? 1 : 0); \
1099 section = SHDR ## B (elf_findsecbyname(elf, find_section+invert)); \
1100 if ((section == NULL && invert) || (section != NULL && !invert)) \
1101 *found_section = 1; \
1102 }
1103 FIND_SECTION(32)
1104 FIND_SECTION(64)
1105
1106 if (be_wewy_wewy_quiet)
1107 return NULL;
1108
1109 if (*found_section)
1110 return find_section;
1111
1112 if (be_quiet)
1113 return NULL;
1114 else
1115 return (char *)" - ";
1116}
1117
661/* scan an elf file and show all the fun stuff */ 1118/* scan an elf file and show all the fun stuff */
662#define prints(str) write(fileno(stdout), str, strlen(str)) 1119#define prints(str) write(fileno(stdout), str, strlen(str))
663static void scanelf_file(const char *filename) 1120static int scanelf_elfobj(elfobj *elf)
664{ 1121{
665 unsigned long i; 1122 unsigned long i;
666 char found_pax, found_phdr, found_relro, found_load, found_textrel, 1123 char found_pax, found_phdr, found_relro, found_load, found_textrel,
667 found_rpath, found_needed, found_interp, found_bind, found_soname, 1124 found_rpath, found_needed, found_interp, found_bind, found_soname,
668 found_sym, found_lib, found_file, found_textrels; 1125 found_sym, found_lib, found_file, found_textrels, found_section;
669 elfobj *elf;
670 struct stat st;
671 static char *out_buffer = NULL; 1126 static char *out_buffer = NULL;
672 static size_t out_len; 1127 static size_t out_len;
673 1128
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 = \ 1129 found_pax = found_phdr = found_relro = found_load = found_textrel = \
690 found_rpath = found_needed = found_interp = found_bind = found_soname = \ 1130 found_rpath = found_needed = found_interp = found_bind = found_soname = \
691 found_sym = found_lib = found_file = found_textrels = 0; 1131 found_sym = found_lib = found_file = found_textrels = found_section = 0;
692 1132
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) 1133 if (be_verbose > 2)
700 printf("%s: scanning file {%s,%s}\n", filename, 1134 printf("%s: scanning file {%s,%s}\n", elf->filename,
701 get_elfeitype(EI_CLASS, elf->elf_class), 1135 get_elfeitype(EI_CLASS, elf->elf_class),
702 get_elfeitype(EI_DATA, elf->data[EI_DATA])); 1136 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
703 else if (be_verbose) 1137 else if (be_verbose > 1)
704 printf("%s: scanning file\n", filename); 1138 printf("%s: scanning file\n", elf->filename);
705 1139
706 /* init output buffer */ 1140 /* init output buffer */
707 if (!out_buffer) { 1141 if (!out_buffer) {
708 out_len = sizeof(char) * 80; 1142 out_len = sizeof(char) * 80;
709 out_buffer = (char*)xmalloc(out_len); 1143 out_buffer = xmalloc(out_len);
710 } 1144 }
711 *out_buffer = '\0'; 1145 *out_buffer = '\0';
712 1146
713 /* show the header */ 1147 /* show the header */
714 if (!be_quiet && show_banner) { 1148 if (!be_quiet && show_banner) {
715 for (i = 0; out_format[i]; ++i) { 1149 for (i = 0; out_format[i]; ++i) {
716 if (!IS_MODIFIER(out_format[i])) continue; 1150 if (!IS_MODIFIER(out_format[i])) continue;
717 1151
718 switch (out_format[++i]) { 1152 switch (out_format[++i]) {
1153 case '+': break;
719 case '%': break; 1154 case '%': break;
720 case '#': break; 1155 case '#': break;
721 case 'F': 1156 case 'F':
722 case 'p': 1157 case 'p':
723 case 'f': prints("FILE "); found_file = 1; break; 1158 case 'f': prints("FILE "); found_file = 1; break;
724 case 'o': prints(" TYPE "); break; 1159 case 'o': prints(" TYPE "); break;
725 case 'x': prints(" PAX "); break; 1160 case 'x': prints(" PAX "); break;
726 case 'e': prints("STK/REL/PTL "); break; 1161 case 'e': prints("STK/REL/PTL "); break;
727 case 't': prints("TEXTREL "); break; 1162 case 't': prints("TEXTREL "); break;
728 case 'r': prints("RPATH "); break; 1163 case 'r': prints("RPATH "); break;
1164 case 'M': prints("CLASS "); break;
729 case 'n': prints("NEEDED "); break; 1165 case 'n': prints("NEEDED "); break;
730 case 'i': prints("INTERP "); break; 1166 case 'i': prints("INTERP "); break;
731 case 'b': prints("BIND "); break; 1167 case 'b': prints("BIND "); break;
1168 case 'Z': prints("SIZE "); break;
732 case 'S': prints("SONAME "); break; 1169 case 'S': prints("SONAME "); break;
733 case 's': prints("SYM "); break; 1170 case 's': prints("SYM "); break;
734 case 'N': prints("LIB "); break; 1171 case 'N': prints("LIB "); break;
735 case 'T': prints("TEXTRELS "); break; 1172 case 'T': prints("TEXTRELS "); break;
1173 case 'k': prints("SECTION "); break;
1174 case 'a': prints("ARCH "); break;
1175 case 'I': prints("OSABI "); break;
1176 case 'Y': prints("EABI "); break;
1177 case 'O': prints("PERM "); break;
1178 case 'D': prints("ENDIAN "); break;
736 default: warnf("'%c' has no title ?", out_format[i]); 1179 default: warnf("'%c' has no title ?", out_format[i]);
737 } 1180 }
738 } 1181 }
739 if (!found_file) prints("FILE "); 1182 if (!found_file) prints("FILE ");
740 prints("\n"); 1183 prints("\n");
744 1187
745 /* dump all the good stuff */ 1188 /* dump all the good stuff */
746 for (i = 0; out_format[i]; ++i) { 1189 for (i = 0; out_format[i]; ++i) {
747 const char *out; 1190 const char *out;
748 const char *tmp; 1191 const char *tmp;
749 1192 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])) { 1193 if (!IS_MODIFIER(out_format[i])) {
755 xchrcat(&out_buffer, out_format[i], &out_len); 1194 xchrcat(&out_buffer, out_format[i], &out_len);
756 continue; 1195 continue;
757 } 1196 }
758 1197
759 out = NULL; 1198 out = NULL;
760 be_wewy_wewy_quiet = (out_format[i] == '#'); 1199 be_wewy_wewy_quiet = (out_format[i] == '#');
1200 be_semi_verbose = (out_format[i] == '+');
761 switch (out_format[++i]) { 1201 switch (out_format[++i]) {
1202 case '+':
762 case '%': 1203 case '%':
763 case '#': 1204 case '#':
764 xchrcat(&out_buffer, out_format[i], &out_len); break; 1205 xchrcat(&out_buffer, out_format[i], &out_len); break;
765 case 'F': 1206 case 'F':
766 found_file = 1; 1207 found_file = 1;
767 if (be_wewy_wewy_quiet) break; 1208 if (be_wewy_wewy_quiet) break;
768 xstrcat(&out_buffer, filename, &out_len); 1209 xstrcat(&out_buffer, elf->filename, &out_len);
769 break; 1210 break;
770 case 'p': 1211 case 'p':
771 found_file = 1; 1212 found_file = 1;
772 if (be_wewy_wewy_quiet) break; 1213 if (be_wewy_wewy_quiet) break;
773 tmp = filename; 1214 tmp = elf->filename;
774 if (search_path) { 1215 if (search_path) {
775 ssize_t len_search = strlen(search_path); 1216 ssize_t len_search = strlen(search_path);
776 ssize_t len_file = strlen(filename); 1217 ssize_t len_file = strlen(elf->filename);
777 if (!strncmp(filename, search_path, len_search) && \ 1218 if (!strncmp(elf->filename, search_path, len_search) && \
778 len_file > len_search) 1219 len_file > len_search)
779 tmp += len_search; 1220 tmp += len_search;
780 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++; 1221 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
781 } 1222 }
782 xstrcat(&out_buffer, tmp, &out_len); 1223 xstrcat(&out_buffer, tmp, &out_len);
783 break; 1224 break;
784 case 'f': 1225 case 'f':
785 found_file = 1; 1226 found_file = 1;
786 if (be_wewy_wewy_quiet) break; 1227 if (be_wewy_wewy_quiet) break;
787 tmp = strrchr(filename, '/'); 1228 tmp = strrchr(elf->filename, '/');
788 tmp = (tmp == NULL ? filename : tmp+1); 1229 tmp = (tmp == NULL ? elf->filename : tmp+1);
789 xstrcat(&out_buffer, tmp, &out_len); 1230 xstrcat(&out_buffer, tmp, &out_len);
790 break; 1231 break;
791 case 'o': out = get_elfetype(elf); break; 1232 case 'o': out = get_elfetype(elf); break;
792 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1233 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; 1234 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; 1235 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
795 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break; 1236 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; 1237 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1238 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1239 case 'D': out = get_endian(elf); break;
1240 case 'O': out = getstr_perms(elf->filename); break;
797 case 'n': 1241 case 'n':
798 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break; 1242 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; 1243 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
800 case 'b': out = scanelf_file_bind(elf, &found_bind); break; 1244 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
801 case 'S': out = scanelf_file_soname(elf, &found_soname); break; 1245 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
802 case 's': out = scanelf_file_sym(elf, &found_sym); break; 1246 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1247 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1248 case 'a': out = get_elfemtype(elf); break;
1249 case 'I': out = get_elfosabi(elf); break;
1250 case 'Y': out = get_elf_eabi(elf); break;
1251 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]); 1252 default: warnf("'%c' has no scan code?", out_format[i]);
804 } 1253 }
1254 if (out) {
1255 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
1256 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
1257 xstrncat(&out_buffer, out, &out_len, (tmp-out));
1258 else
805 if (out) xstrcat(&out_buffer, out, &out_len); 1259 xstrcat(&out_buffer, out, &out_len);
1260 }
806 } 1261 }
807 1262
808#define FOUND_SOMETHING() \ 1263#define FOUND_SOMETHING() \
809 (found_pax || found_phdr || found_relro || found_load || found_textrel || \ 1264 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
810 found_rpath || found_needed || found_interp || found_bind || \ 1265 found_rpath || found_needed || found_interp || found_bind || \
811 found_soname || found_sym || found_lib || found_textrels) 1266 found_soname || found_sym || found_lib || found_textrels || found_section )
812 1267
813 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) { 1268 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
814 xchrcat(&out_buffer, ' ', &out_len); 1269 xchrcat(&out_buffer, ' ', &out_len);
815 xstrcat(&out_buffer, filename, &out_len); 1270 xstrcat(&out_buffer, elf->filename, &out_len);
816 } 1271 }
817 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) { 1272 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
818 puts(out_buffer); 1273 puts(out_buffer);
819 fflush(stdout); 1274 fflush(stdout);
820 } 1275 }
821 1276
1277 return 0;
1278}
1279
1280/* scan a single elf */
1281static int scanelf_elf(const char *filename, int fd, size_t len)
1282{
1283 int ret = 1;
1284 elfobj *elf;
1285
1286 /* verify this is real ELF */
1287 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1288 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1289 return ret;
1290 }
1291 switch (match_bits) {
1292 case 32:
1293 if (elf->elf_class != ELFCLASS32)
1294 goto label_done;
1295 break;
1296 case 64:
1297 if (elf->elf_class != ELFCLASS64)
1298 goto label_done;
1299 break;
1300 default: break;
1301 }
1302 if (strlen(match_etypes)) {
1303 char sbuf[126];
1304 strncpy(sbuf, match_etypes, sizeof(sbuf));
1305 if (strchr(match_etypes, ',') != NULL) {
1306 char *p;
1307 while ((p = strrchr(sbuf, ',')) != NULL) {
1308 *p = 0;
1309 if (etype_lookup(p+1) == get_etype(elf))
1310 goto label_ret;
1311 }
1312 }
1313 if (etype_lookup(sbuf) != get_etype(elf))
1314 goto label_done;
1315 }
1316
1317label_ret:
1318 ret = scanelf_elfobj(elf);
1319
1320label_done:
822 unreadelf(elf); 1321 unreadelf(elf);
1322 return ret;
1323}
1324
1325/* scan an archive of elfs */
1326static int scanelf_archive(const char *filename, int fd, size_t len)
1327{
1328 archive_handle *ar;
1329 archive_member *m;
1330 char *ar_buffer;
1331 elfobj *elf;
1332
1333 ar = ar_open_fd(filename, fd);
1334 if (ar == NULL)
1335 return 1;
1336
1337 ar_buffer = mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1338 while ((m=ar_next(ar)) != NULL) {
1339 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size);
1340 if (elf) {
1341 scanelf_elfobj(elf);
1342 unreadelf(elf);
1343 }
1344 }
1345 munmap(ar_buffer, len);
1346
1347 return 0;
1348}
1349/* scan a file which may be an elf or an archive or some other magical beast */
1350static int scanelf_file(const char *filename, const struct stat *st_cache)
1351{
1352 const struct stat *st = st_cache;
1353 struct stat symlink_st;
1354 int fd;
1355
1356 /* always handle regular files and handle symlinked files if no -y */
1357 if (S_ISLNK(st->st_mode)) {
1358 if (!scan_symlink) return 1;
1359 stat(filename, &symlink_st);
1360 st = &symlink_st;
1361 }
1362
1363 if (!S_ISREG(st->st_mode)) {
1364 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1365 return 1;
1366 }
1367
1368 if (match_perms) {
1369 if ((st->st_mode | match_perms) != st->st_mode)
1370 return 1;
1371 }
1372 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1373 return 1;
1374
1375 if (scanelf_elf(filename, fd, st->st_size) == 1 && scan_archives)
1376 /* if it isn't an ELF, maybe it's an .a archive */
1377 scanelf_archive(filename, fd, st->st_size);
1378
1379 close(fd);
1380 return 0;
823} 1381}
824 1382
825/* scan a directory for ET_EXEC files and print when we find one */ 1383/* scan a directory for ET_EXEC files and print when we find one */
826static void scanelf_dir(const char *path) 1384static int scanelf_dir(const char *path)
827{ 1385{
828 register DIR *dir; 1386 register DIR *dir;
829 register struct dirent *dentry; 1387 register struct dirent *dentry;
830 struct stat st_top, st; 1388 struct stat st_top, st;
831 char buf[_POSIX_PATH_MAX]; 1389 char buf[__PAX_UTILS_PATH_MAX];
832 size_t pathlen = 0, len = 0; 1390 size_t pathlen = 0, len = 0;
1391 int ret = 0;
833 1392
834 /* make sure path exists */ 1393 /* make sure path exists */
835 if (lstat(path, &st_top) == -1) { 1394 if (lstat(path, &st_top) == -1) {
836 if (be_verbose > 2) printf("%s: does not exist\n", path); 1395 if (be_verbose > 2) printf("%s: does not exist\n", path);
837 return; 1396 return 1;
838 } 1397 }
839 1398
840 /* ok, if it isn't a directory, assume we can open it */ 1399 /* ok, if it isn't a directory, assume we can open it */
841 if (!S_ISDIR(st_top.st_mode)) { 1400 if (!S_ISDIR(st_top.st_mode)) {
842 scanelf_file(path); 1401 return scanelf_file(path, &st_top);
843 return;
844 } 1402 }
845 1403
846 /* now scan the dir looking for fun stuff */ 1404 /* now scan the dir looking for fun stuff */
847 if ((dir = opendir(path)) == NULL) { 1405 if ((dir = opendir(path)) == NULL) {
848 warnf("could not opendir %s: %s", path, strerror(errno)); 1406 warnf("could not opendir %s: %s", path, strerror(errno));
849 return; 1407 return 1;
850 } 1408 }
851 if (be_verbose) printf("%s: scanning dir\n", path); 1409 if (be_verbose > 1) printf("%s: scanning dir\n", path);
852 1410
853 pathlen = strlen(path); 1411 pathlen = strlen(path);
854 while ((dentry = readdir(dir))) { 1412 while ((dentry = readdir(dir))) {
855 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1413 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
856 continue; 1414 continue;
858 if (len >= sizeof(buf)) { 1416 if (len >= sizeof(buf)) {
859 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path, 1417 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
860 (unsigned long)len, (unsigned long)sizeof(buf)); 1418 (unsigned long)len, (unsigned long)sizeof(buf));
861 continue; 1419 continue;
862 } 1420 }
863 sprintf(buf, "%s/%s", path, dentry->d_name); 1421 snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name);
864 if (lstat(buf, &st) != -1) { 1422 if (lstat(buf, &st) != -1) {
865 if (S_ISREG(st.st_mode)) 1423 if (S_ISREG(st.st_mode))
866 scanelf_file(buf); 1424 ret = scanelf_file(buf, &st);
867 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1425 else if (dir_recurse && S_ISDIR(st.st_mode)) {
868 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1426 if (dir_crossmount || (st_top.st_dev == st.st_dev))
869 scanelf_dir(buf); 1427 ret = scanelf_dir(buf);
870 } 1428 }
871 } 1429 }
872 } 1430 }
873 closedir(dir); 1431 closedir(dir);
1432 return ret;
874} 1433}
875 1434
876static int scanelf_from_file(char *filename) 1435static int scanelf_from_file(const char *filename)
877{ 1436{
878 FILE *fp = NULL; 1437 FILE *fp = NULL;
879 char *p; 1438 char *p;
880 char path[_POSIX_PATH_MAX]; 1439 char path[__PAX_UTILS_PATH_MAX];
1440 int ret = 0;
881 1441
882 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL)) 1442 if (strcmp(filename, "-") == 0)
883 fp = stdin; 1443 fp = stdin;
884 else if ((fp = fopen(filename, "r")) == NULL) 1444 else if ((fp = fopen(filename, "r")) == NULL)
885 return 1; 1445 return 1;
886 1446
887 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1447 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
888 if ((p = strchr(path, '\n')) != NULL) 1448 if ((p = strchr(path, '\n')) != NULL)
889 *p = 0; 1449 *p = 0;
890 search_path = path; 1450 search_path = path;
891 scanelf_dir(path); 1451 ret = scanelf_dir(path);
892 } 1452 }
893 if (fp != stdin) 1453 if (fp != stdin)
894 fclose(fp); 1454 fclose(fp);
895 return 0; 1455 return ret;
896} 1456}
897 1457
898static void load_ld_so_conf() 1458#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1459
1460static int load_ld_cache_config(int i, const char *fname)
899{ 1461{
900 FILE *fp = NULL; 1462 FILE *fp = NULL;
901 char *p; 1463 char *p;
902 char path[_POSIX_PATH_MAX]; 1464 char path[__PAX_UTILS_PATH_MAX];
903 int i = 0;
904 1465
905 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1466 if (i + 1 == ARRAY_SIZE(ldpaths))
906 return; 1467 return i;
907 1468
1469 if ((fp = fopen(fname, "r")) == NULL)
1470 return i;
1471
908 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1472 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
909 if (*path != '/')
910 continue;
911
912 if ((p = strrchr(path, '\r')) != NULL) 1473 if ((p = strrchr(path, '\r')) != NULL)
913 *p = 0; 1474 *p = 0;
914 if ((p = strchr(path, '\n')) != NULL) 1475 if ((p = strchr(path, '\n')) != NULL)
915 *p = 0; 1476 *p = 0;
1477#ifdef __linux__
1478 /* recursive includes of the same file will make this segfault. */
1479 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1480 glob64_t gl;
1481 size_t x;
1482 char gpath[__PAX_UTILS_PATH_MAX];
1483
1484 memset(gpath, 0, sizeof(gpath));
1485
1486 if (path[8] != '/')
1487 snprintf(gpath, sizeof(gpath), "/etc/%s", &path[8]);
1488 else
1489 strncpy(gpath, &path[8], sizeof(gpath));
1490
1491 if ((glob64(gpath, 0, NULL, &gl)) == 0) {
1492 for (x = 0; x < gl.gl_pathc; ++x) {
1493 /* try to avoid direct loops */
1494 if (strcmp(gl.gl_pathv[x], fname) == 0)
1495 continue;
1496 i = load_ld_cache_config(i, gl.gl_pathv[x]);
1497 if (i + 1 >= ARRAY_SIZE(ldpaths)) {
1498 globfree64(&gl);
1499 return i;
1500 }
1501 }
1502 globfree64 (&gl);
1503 continue;
1504 }
1505 }
1506#endif
1507 if (*path != '/')
1508 continue;
916 1509
917 ldpaths[i++] = xstrdup(path); 1510 ldpaths[i++] = xstrdup(path);
918 1511
919 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths)) 1512 if (i + 1 == ARRAY_SIZE(ldpaths))
920 break; 1513 break;
921 } 1514 }
922 ldpaths[i] = NULL; 1515 ldpaths[i] = NULL;
923 1516
924 fclose(fp); 1517 fclose(fp);
1518 return i;
925} 1519}
1520
1521#elif defined(__FreeBSD__) || (__DragonFly__)
1522
1523static int load_ld_cache_config(int i, const char *fname)
1524{
1525 FILE *fp = NULL;
1526 char *b = NULL, *p;
1527 struct elfhints_hdr hdr;
1528
1529 if (i + 1 == ARRAY_SIZE(ldpaths))
1530 return i;
1531
1532 if ((fp = fopen(fname, "r")) == NULL)
1533 return i;
1534
1535 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1536 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1537 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1538 {
1539 fclose(fp);
1540 return i;
1541 }
1542
1543 b = xmalloc(hdr.dirlistlen + 1);
1544 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1545 fclose(fp);
1546 free(b);
1547 return i;
1548 }
1549
1550 while ((p = strsep(&b, ":"))) {
1551 if (*p == '\0') continue;
1552 ldpaths[i++] = xstrdup(p);
1553
1554 if (i + 1 == ARRAY_SIZE(ldpaths))
1555 break;
1556 }
1557 ldpaths[i] = NULL;
1558
1559 free(b);
1560 fclose(fp);
1561 return i;
1562}
1563
1564#else
1565#ifdef __ELF__
1566#warning Cache config support not implemented for your target
1567#endif
1568static int load_ld_cache_config(int i, const char *fname)
1569{
1570 memset(ldpaths, 0x00, sizeof(ldpaths));
1571 return 0;
1572}
1573#endif
926 1574
927/* scan /etc/ld.so.conf for paths */ 1575/* scan /etc/ld.so.conf for paths */
928static void scanelf_ldpath() 1576static void scanelf_ldpath(void)
929{ 1577{
930 char scan_l, scan_ul, scan_ull; 1578 char scan_l, scan_ul, scan_ull;
931 int i = 0; 1579 int i = 0;
932 1580
933 if (!ldpaths[0]) 1581 if (!ldpaths[0])
947 if (!scan_ul) scanelf_dir("/usr/lib"); 1595 if (!scan_ul) scanelf_dir("/usr/lib");
948 if (!scan_ull) scanelf_dir("/usr/local/lib"); 1596 if (!scan_ull) scanelf_dir("/usr/local/lib");
949} 1597}
950 1598
951/* scan env PATH for paths */ 1599/* scan env PATH for paths */
952static void scanelf_envpath() 1600static void scanelf_envpath(void)
953{ 1601{
954 char *path, *p; 1602 char *path, *p;
955 1603
956 path = getenv("PATH"); 1604 path = getenv("PATH");
957 if (!path) 1605 if (!path)
964 } 1612 }
965 1613
966 free(path); 1614 free(path);
967} 1615}
968 1616
969 1617/* 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" 1618#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZBhV"
973#define a_argument required_argument 1619#define a_argument required_argument
974static struct option const long_opts[] = { 1620static struct option const long_opts[] = {
975 {"path", no_argument, NULL, 'p'}, 1621 {"path", no_argument, NULL, 'p'},
976 {"ldpath", no_argument, NULL, 'l'}, 1622 {"ldpath", no_argument, NULL, 'l'},
977 {"recursive", no_argument, NULL, 'R'}, 1623 {"recursive", no_argument, NULL, 'R'},
978 {"mount", no_argument, NULL, 'm'}, 1624 {"mount", no_argument, NULL, 'm'},
979 {"symlink", no_argument, NULL, 'y'}, 1625 {"symlink", no_argument, NULL, 'y'},
1626 {"archives", no_argument, NULL, 'A'},
1627 {"ldcache", no_argument, NULL, 'L'},
1628 {"fix", no_argument, NULL, 'X'},
1629 {"setpax", a_argument, NULL, 'z'},
980 {"pax", no_argument, NULL, 'x'}, 1630 {"pax", no_argument, NULL, 'x'},
981 {"header", no_argument, NULL, 'e'}, 1631 {"header", no_argument, NULL, 'e'},
982 {"textrel", no_argument, NULL, 't'}, 1632 {"textrel", no_argument, NULL, 't'},
983 {"rpath", no_argument, NULL, 'r'}, 1633 {"rpath", no_argument, NULL, 'r'},
984 {"needed", no_argument, NULL, 'n'}, 1634 {"needed", no_argument, NULL, 'n'},
985 {"interp", no_argument, NULL, 'i'}, 1635 {"interp", no_argument, NULL, 'i'},
986 {"bind", no_argument, NULL, 'b'}, 1636 {"bind", no_argument, NULL, 'b'},
987 {"soname", no_argument, NULL, 'S'}, 1637 {"soname", no_argument, NULL, 'S'},
988 {"symbol", a_argument, NULL, 's'}, 1638 {"symbol", a_argument, NULL, 's'},
1639 {"section", a_argument, NULL, 'k'},
989 {"lib", a_argument, NULL, 'N'}, 1640 {"lib", a_argument, NULL, 'N'},
990 {"gmatch", no_argument, NULL, 'g'}, 1641 {"gmatch", no_argument, NULL, 'g'},
991 {"textrels", no_argument, NULL, 'T'}, 1642 {"textrels", no_argument, NULL, 'T'},
1643 {"etype", a_argument, NULL, 'E'},
1644 {"bits", a_argument, NULL, 'M'},
1645 {"endian", no_argument, NULL, 'D'},
1646 {"osabi", no_argument, NULL, 'I'},
1647 {"eabi", no_argument, NULL, 'Y'},
1648 {"perms", a_argument, NULL, 'O'},
1649 {"size", no_argument, NULL, 'Z'},
992 {"all", no_argument, NULL, 'a'}, 1650 {"all", no_argument, NULL, 'a'},
993 {"quiet", no_argument, NULL, 'q'}, 1651 {"quiet", no_argument, NULL, 'q'},
994 {"verbose", no_argument, NULL, 'v'}, 1652 {"verbose", no_argument, NULL, 'v'},
995 {"format", a_argument, NULL, 'F'}, 1653 {"format", a_argument, NULL, 'F'},
996 {"from", a_argument, NULL, 'f'}, 1654 {"from", a_argument, NULL, 'f'},
1004static const char *opts_help[] = { 1662static const char *opts_help[] = {
1005 "Scan all directories in PATH environment", 1663 "Scan all directories in PATH environment",
1006 "Scan all directories in /etc/ld.so.conf", 1664 "Scan all directories in /etc/ld.so.conf",
1007 "Scan directories recursively", 1665 "Scan directories recursively",
1008 "Don't recursively cross mount points", 1666 "Don't recursively cross mount points",
1009 "Don't scan symlinks\n", 1667 "Don't scan symlinks",
1668 "Scan archives (.a files)",
1669 "Utilize ld.so.cache information (use with -r/-n)",
1670 "Try and 'fix' bad things (use with -r/-e)",
1671 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1010 "Print PaX markings", 1672 "Print PaX markings",
1011 "Print GNU_STACK/PT_LOAD markings", 1673 "Print GNU_STACK/PT_LOAD markings",
1012 "Print TEXTREL information", 1674 "Print TEXTREL information",
1013 "Print RPATH information", 1675 "Print RPATH information",
1014 "Print NEEDED information", 1676 "Print NEEDED information",
1015 "Print INTERP information", 1677 "Print INTERP information",
1016 "Print BIND information", 1678 "Print BIND information",
1017 "Print SONAME information", 1679 "Print SONAME information",
1018 "Find a specified symbol", 1680 "Find a specified symbol",
1681 "Find a specified section",
1019 "Find a specified library", 1682 "Find a specified library",
1020 "Use strncmp to match libraries. (use with -N)", 1683 "Use strncmp to match libraries. (use with -N)",
1021 "Locate cause of TEXTREL", 1684 "Locate cause of TEXTREL",
1685 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1686 "Print only ELF files matching numeric bits",
1687 "Print Endianness",
1688 "Print OSABI",
1689 "Print EABI (EM_ARM Only)",
1690 "Print only ELF files matching octal permissions",
1691 "Print ELF file size",
1022 "Print all scanned info (-x -e -t -r -b)\n", 1692 "Print all scanned info (-x -e -t -r -b)\n",
1023 "Only output 'bad' things", 1693 "Only output 'bad' things",
1024 "Be verbose (can be specified more than once)", 1694 "Be verbose (can be specified more than once)",
1025 "Use specified format for output", 1695 "Use specified format for output",
1026 "Read input stream from a filename", 1696 "Read input stream from a filename",
1034/* display usage and exit */ 1704/* display usage and exit */
1035static void usage(int status) 1705static void usage(int status)
1036{ 1706{
1037 unsigned long i; 1707 unsigned long i;
1038 printf("* Scan ELF binaries for stuff\n\n" 1708 printf("* Scan ELF binaries for stuff\n\n"
1039 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0); 1709 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1040 printf("Options: -[%s]\n", PARSE_FLAGS); 1710 printf("Options: -[%s]\n", PARSE_FLAGS);
1041 for (i = 0; long_opts[i].name; ++i) 1711 for (i = 0; long_opts[i].name; ++i)
1042 if (long_opts[i].has_arg == no_argument) 1712 if (long_opts[i].has_arg == no_argument)
1043 printf(" -%c, --%-13s* %s\n", long_opts[i].val, 1713 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
1044 long_opts[i].name, opts_help[i]); 1714 long_opts[i].name, opts_help[i]);
1045 else 1715 else
1046 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val, 1716 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
1047 long_opts[i].name, opts_help[i]); 1717 long_opts[i].name, opts_help[i]);
1048 1718
1049 if (status != EXIT_SUCCESS) 1719 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); 1720 exit(status);
1063} 1721}
1064 1722
1065/* parse command line arguments and preform needed actions */ 1723/* parse command line arguments and preform needed actions */
1724#define do_pax_state(option, flag) \
1725 if (islower(option)) { \
1726 flags &= ~PF_##flag; \
1727 flags |= PF_NO##flag; \
1728 } else { \
1729 flags &= ~PF_NO##flag; \
1730 flags |= PF_##flag; \
1731 }
1066static void parseargs(int argc, char *argv[]) 1732static int parseargs(int argc, char *argv[])
1067{ 1733{
1068 int i; 1734 int i;
1069 char *from_file = NULL; 1735 const char *from_file = NULL;
1736 int ret = 0;
1070 1737
1071 opterr = 0; 1738 opterr = 0;
1072 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 1739 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1073 switch (i) { 1740 switch (i) {
1074 1741
1078 VERSION, __FILE__, __DATE__, rcsid, argv0); 1745 VERSION, __FILE__, __DATE__, rcsid, argv0);
1079 exit(EXIT_SUCCESS); 1746 exit(EXIT_SUCCESS);
1080 break; 1747 break;
1081 case 'h': usage(EXIT_SUCCESS); break; 1748 case 'h': usage(EXIT_SUCCESS); break;
1082 case 'f': 1749 case 'f':
1083 if (from_file) err("Don't specify -f twice"); 1750 if (from_file) warn("You prob don't want to specify -f twice");
1084 from_file = xstrdup(optarg); 1751 from_file = optarg;
1752 break;
1753 case 'E':
1754 strncpy(match_etypes, optarg, sizeof(match_etypes));
1755 break;
1756 case 'M':
1757 match_bits = atoi(optarg);
1758 if (match_bits == 0) {
1759 if (strcmp(optarg, "ELFCLASS32") == 0)
1760 match_bits = 32;
1761 if (strcmp(optarg, "ELFCLASS64") == 0)
1762 match_bits = 64;
1763 }
1764 break;
1765 case 'O':
1766 if (sscanf(optarg, "%o", &match_perms) == (-1))
1767 match_bits = 0;
1085 break; 1768 break;
1086 case 'o': { 1769 case 'o': {
1087 FILE *fp = NULL;
1088 if ((fp = freopen(optarg, "w", stdout)) == NULL) 1770 if (freopen(optarg, "w", stdout) == NULL)
1089 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 1771 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1090 SET_STDOUT(fp);
1091 break; 1772 break;
1092 } 1773 }
1093 1774 case 'k':
1775 if (find_section) warn("You prob don't want to specify -k twice");
1776 find_section = optarg;
1777 break;
1094 case 's': { 1778 case 's': {
1095 size_t len;
1096 if (find_sym) err("Don't specify -s twice"); 1779 if (find_sym) warn("You prob don't want to specify -s twice");
1097 find_sym = xstrdup(optarg); 1780 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; 1781 break;
1102 } 1782 }
1103 case 'N': { 1783 case 'N': {
1104 if (find_lib) err("Don't specify -N twice"); 1784 if (find_lib) warn("You prob don't want to specify -N twice");
1105 find_lib = xstrdup(optarg); 1785 find_lib = optarg;
1106 break; 1786 break;
1107 } 1787 }
1108 1788
1109 case 'F': { 1789 case 'F': {
1110 if (out_format) err("Don't specify -F twice"); 1790 if (out_format) warn("You prob don't want to specify -F twice");
1111 out_format = xstrdup(optarg); 1791 out_format = optarg;
1792 break;
1793 }
1794 case 'z': {
1795 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1796 size_t x;
1797
1798 for (x = 0; x < strlen(optarg); x++) {
1799 switch (optarg[x]) {
1800 case 'p':
1801 case 'P':
1802 do_pax_state(optarg[x], PAGEEXEC);
1112 break; 1803 break;
1804 case 's':
1805 case 'S':
1806 do_pax_state(optarg[x], SEGMEXEC);
1807 break;
1808 case 'm':
1809 case 'M':
1810 do_pax_state(optarg[x], MPROTECT);
1811 break;
1812 case 'e':
1813 case 'E':
1814 do_pax_state(optarg[x], EMUTRAMP);
1815 break;
1816 case 'r':
1817 case 'R':
1818 do_pax_state(optarg[x], RANDMMAP);
1819 break;
1820 case 'x':
1821 case 'X':
1822 do_pax_state(optarg[x], RANDEXEC);
1823 break;
1824 default:
1825 break;
1826 }
1113 } 1827 }
1114 1828 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
1829 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
1830 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
1831 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
1832 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1833 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1834 setpax = flags;
1835 break;
1836 }
1837 case 'Z': show_size = 1; break;
1115 case 'g': gmatch = 1; 1838 case 'g': g_match = 1; break;
1839 case 'L': use_ldcache = 1; break;
1116 case 'y': scan_symlink = 0; break; 1840 case 'y': scan_symlink = 0; break;
1841 case 'A': scan_archives = 1; break;
1117 case 'B': show_banner = 0; break; 1842 case 'B': show_banner = 0; break;
1118 case 'l': scan_ldpath = 1; break; 1843 case 'l': scan_ldpath = 1; break;
1119 case 'p': scan_envpath = 1; break; 1844 case 'p': scan_envpath = 1; break;
1120 case 'R': dir_recurse = 1; break; 1845 case 'R': dir_recurse = 1; break;
1121 case 'm': dir_crossmount = 0; break; 1846 case 'm': dir_crossmount = 0; break;
1847 case 'X': ++fix_elf; break;
1122 case 'x': show_pax = 1; break; 1848 case 'x': show_pax = 1; break;
1123 case 'e': show_phdr = 1; break; 1849 case 'e': show_phdr = 1; break;
1124 case 't': show_textrel = 1; break; 1850 case 't': show_textrel = 1; break;
1125 case 'r': show_rpath = 1; break; 1851 case 'r': show_rpath = 1; break;
1126 case 'n': show_needed = 1; break; 1852 case 'n': show_needed = 1; break;
1128 case 'b': show_bind = 1; break; 1854 case 'b': show_bind = 1; break;
1129 case 'S': show_soname = 1; break; 1855 case 'S': show_soname = 1; break;
1130 case 'T': show_textrels = 1; break; 1856 case 'T': show_textrels = 1; break;
1131 case 'q': be_quiet = 1; break; 1857 case 'q': be_quiet = 1; break;
1132 case 'v': be_verbose = (be_verbose % 20) + 1; break; 1858 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1133 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break; 1859 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
1134 1860 case 'D': show_endian = 1; break;
1861 case 'I': show_osabi = 1; break;
1862 case 'Y': show_eabi = 1; break;
1135 case ':': 1863 case ':':
1136 err("Option missing parameter\n"); 1864 err("Option '%c' is missing parameter", optopt);
1137 case '?': 1865 case '?':
1138 err("Unknown option\n"); 1866 err("Unknown option '%c' or argument missing", optopt);
1139 default: 1867 default:
1140 err("Unhandled option '%c'", i); 1868 err("Unhandled option '%c'; please report this", i);
1141 }
1142 } 1869 }
1143 1870 }
1871 if (show_textrels && be_verbose) {
1872 if (which("objdump") != NULL)
1873 has_objdump = 1;
1874 }
1144 /* let the format option override all other options */ 1875 /* let the format option override all other options */
1145 if (out_format) { 1876 if (out_format) {
1146 show_pax = show_phdr = show_textrel = show_rpath = \ 1877 show_pax = show_phdr = show_textrel = show_rpath = \
1147 show_needed = show_interp = show_bind = show_soname = \ 1878 show_needed = show_interp = show_bind = show_soname = \
1148 show_textrels = 0; 1879 show_textrels = show_perms = show_endian = show_size = \
1880 show_osabi = show_eabi = 0;
1149 for (i = 0; out_format[i]; ++i) { 1881 for (i = 0; out_format[i]; ++i) {
1150 if (!IS_MODIFIER(out_format[i])) continue; 1882 if (!IS_MODIFIER(out_format[i])) continue;
1151 1883
1152 switch (out_format[++i]) { 1884 switch (out_format[++i]) {
1885 case '+': break;
1153 case '%': break; 1886 case '%': break;
1154 case '#': break; 1887 case '#': break;
1155 case 'F': break; 1888 case 'F': break;
1156 case 'p': break; 1889 case 'p': break;
1157 case 'f': break; 1890 case 'f': break;
1891 case 'k': break;
1158 case 's': break; 1892 case 's': break;
1159 case 'N': break; 1893 case 'N': break;
1160 case 'o': break; 1894 case 'o': break;
1895 case 'a': break;
1896 case 'M': break;
1897 case 'Z': show_size = 1; break;
1898 case 'D': show_endian = 1; break;
1899 case 'I': show_osabi = 1; break;
1900 case 'Y': show_eabi = 1; break;
1901 case 'O': show_perms = 1; break;
1161 case 'x': show_pax = 1; break; 1902 case 'x': show_pax = 1; break;
1162 case 'e': show_phdr = 1; break; 1903 case 'e': show_phdr = 1; break;
1163 case 't': show_textrel = 1; break; 1904 case 't': show_textrel = 1; break;
1164 case 'r': show_rpath = 1; break; 1905 case 'r': show_rpath = 1; break;
1165 case 'n': show_needed = 1; break; 1906 case 'n': show_needed = 1; break;
1166 case 'i': show_interp = 1; break; 1907 case 'i': show_interp = 1; break;
1167 case 'b': show_bind = 1; break; 1908 case 'b': show_bind = 1; break;
1168 case 'S': show_soname = 1; break; 1909 case 'S': show_soname = 1; break;
1169 case 'T': show_textrels = 1; break; 1910 case 'T': show_textrels = 1; break;
1170 default: 1911 default:
1171 err("Invalid format specifier '%c' (byte %i)", 1912 err("Invalid format specifier '%c' (byte %i)",
1172 out_format[i], i+1); 1913 out_format[i], i+1);
1173 } 1914 }
1174 } 1915 }
1175 1916
1176 /* construct our default format */ 1917 /* construct our default format */
1177 } else { 1918 } else {
1178 size_t fmt_len = 30; 1919 size_t fmt_len = 30;
1179 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 1920 out_format = xmalloc(sizeof(char) * fmt_len);
1921 *out_format = '\0';
1180 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 1922 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1181 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len); 1923 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1924 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
1925 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
1926 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
1927 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
1928 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
1182 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len); 1929 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1183 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 1930 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1184 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 1931 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1185 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 1932 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1186 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 1933 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1187 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len); 1934 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1188 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len); 1935 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1189 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len); 1936 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1190 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len); 1937 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1938 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1191 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len); 1939 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1192 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 1940 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1193 } 1941 }
1194 if (be_verbose > 2) printf("Format: %s\n", out_format); 1942 if (be_verbose > 2) printf("Format: %s\n", out_format);
1195 1943
1196 /* now lets actually do the scanning */ 1944 /* now lets actually do the scanning */
1197 if (scan_ldpath || (show_rpath && be_quiet)) 1945 if (scan_ldpath || use_ldcache)
1198 load_ld_so_conf(); 1946 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
1199 if (scan_ldpath) scanelf_ldpath(); 1947 if (scan_ldpath) scanelf_ldpath();
1200 if (scan_envpath) scanelf_envpath(); 1948 if (scan_envpath) scanelf_envpath();
1949 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
1950 from_file = "-";
1201 if (from_file) { 1951 if (from_file) {
1202 scanelf_from_file(from_file); 1952 scanelf_from_file(from_file);
1203 free(from_file);
1204 from_file = *argv; 1953 from_file = *argv;
1205 } 1954 }
1206 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file) 1955 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1207 err("Nothing to scan !?"); 1956 err("Nothing to scan !?");
1208 while (optind < argc) { 1957 while (optind < argc) {
1209 search_path = argv[optind++]; 1958 search_path = argv[optind++];
1210 scanelf_dir(search_path); 1959 ret = scanelf_dir(search_path);
1211 } 1960 }
1212 1961
1213 /* clean up */ 1962 /* 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) 1963 for (i = 0; ldpaths[i]; ++i)
1221 free(ldpaths[i]); 1964 free(ldpaths[i]);
1222}
1223 1965
1224 1966 if (ldcache != 0)
1225 1967 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; 1968 return ret;
1232} 1969}
1233 1970
1234static void *xmalloc(size_t size) 1971static char **get_split_env(const char *envvar)
1235{ 1972{
1236 void *ret = malloc(size); 1973 const char *delims = " \t\n";
1237 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size); 1974 char **envvals = NULL;
1238 return ret; 1975 char *env, *s;
1239} 1976 int nentry;
1240 1977
1241static void xstrcat(char **dst, const char *src, size_t *curr_len) 1978 if ((env = getenv(envvar)) == NULL)
1242{ 1979 return NULL;
1243 size_t new_len;
1244 1980
1245 new_len = strlen(*dst) + strlen(src); 1981 env = xstrdup(env);
1246 if (*curr_len <= new_len) { 1982 if (env == NULL)
1247 *curr_len = new_len + (*curr_len / 2); 1983 return NULL;
1248 *dst = realloc(*dst, *curr_len);
1249 if (!*dst)
1250 err("could not realloc %li bytes", (unsigned long)*curr_len);
1251 }
1252 1984
1253 strcat(*dst, src); 1985 s = strtok(env, delims);
1254} 1986 if (s == NULL) {
1987 free(env);
1988 return NULL;
1989 }
1255 1990
1256static inline void xchrcat(char **dst, const char append, size_t *curr_len) 1991 nentry = 0;
1257{ 1992 while (s != NULL) {
1258 static char my_app[2]; 1993 ++nentry;
1259 my_app[0] = append; 1994 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
1260 my_app[1] = '\0'; 1995 envvals[nentry-1] = s;
1261 xstrcat(dst, my_app, curr_len); 1996 s = strtok(NULL, delims);
1262} 1997 }
1998 envvals[nentry] = NULL;
1263 1999
2000 /* don't want to free(env) as it contains the memory that backs
2001 * the envvals array of strings */
2002 return envvals;
2003}
1264 2004
2005static void parseenv(void)
2006{
2007 qa_textrels = get_split_env("QA_TEXTRELS");
2008 qa_execstack = get_split_env("QA_EXECSTACK");
2009 qa_wx_load = get_split_env("QA_WX_LOAD");
2010}
2011
2012#ifdef __PAX_UTILS_CLEANUP
2013static void cleanup(void)
2014{
2015 free(out_format);
2016 free(qa_textrels);
2017 free(qa_execstack);
2018 free(qa_wx_load);
2019}
2020#endif
1265 2021
1266int main(int argc, char *argv[]) 2022int main(int argc, char *argv[])
1267{ 2023{
2024 int ret;
1268 if (argc < 2) 2025 if (argc < 2)
1269 usage(EXIT_FAILURE); 2026 usage(EXIT_FAILURE);
2027 parseenv();
1270 parseargs(argc, argv); 2028 ret = parseargs(argc, argv);
1271 fclose(stdout); 2029 fclose(stdout);
1272#ifdef __BOUNDS_CHECKING_ON 2030#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()"); 2031 cleanup();
2032 warn("The calls to add/delete heap should be off:\n"
2033 "\t- 1 due to the out_buffer not being freed in scanelf_file()\n"
2034 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
1274#endif 2035#endif
1275 return EXIT_SUCCESS; 2036 return ret;
1276} 2037}
2038
2039/* Match filename against entries in matchlist, return TRUE
2040 * if the file is listed */
2041static int file_matches_list(const char *filename, char **matchlist)
2042{
2043 char **file;
2044 char *match;
2045 char buf[__PAX_UTILS_PATH_MAX];
2046
2047 if (matchlist == NULL)
2048 return 0;
2049
2050 for (file = matchlist; *file != NULL; file++) {
2051 if (search_path) {
2052 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2053 match = buf;
2054 } else {
2055 match = *file;
2056 }
2057 if (fnmatch(match, filename, 0) == 0)
2058 return 1;
2059 }
2060 return 0;
2061}

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