/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.96 Revision 1.209
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 1.96 2005/12/28 22:26:47 solar Exp $ 4 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.209 2009/03/15 08:53:29 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> 10static const char *rcsid = "$Id: scanelf.c,v 1.209 2009/03/15 08:53:29 vapier Exp $";
11#include <stdlib.h> 11const char * const argv0 = "scanelf";
12#include <sys/types.h> 12
13#include <libgen.h>
14#include <limits.h>
15#include <string.h>
16#include <errno.h>
17#include <unistd.h>
18#include <sys/stat.h>
19#include <sys/mman.h>
20#include <fcntl.h>
21#include <dirent.h>
22#include <getopt.h>
23#include <assert.h>
24#include "paxinc.h" 13#include "paxinc.h"
25 14
26static const char *rcsid = "$Id: scanelf.c,v 1.96 2005/12/28 22:26:47 solar Exp $";
27#define argv0 "scanelf"
28
29#define IS_MODIFIER(c) (c == '%' || c == '#') 15#define IS_MODIFIER(c) (c == '%' || c == '#' || c == '+')
30
31
32 16
33/* prototypes */ 17/* prototypes */
34static 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);
35static void scanelf_dir(const char *path); 23static int scanelf_dir(const char *path);
36static void scanelf_ldpath(); 24static void scanelf_ldpath(void);
37static void scanelf_envpath(); 25static void scanelf_envpath(void);
38static void usage(int status); 26static void usage(int status);
27static char **get_split_env(const char *envvar);
28static void parseenv(void);
39static void parseargs(int argc, char *argv[]); 29static int parseargs(int argc, char *argv[]);
40static char *xstrdup(const char *s); 30static int rematch(const char *regex, const char *match, int cflags);
41static void *xmalloc(size_t size);
42static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n);
43#define xstrcat(dst,src,curr_len) xstrncat(dst,src,curr_len,0)
44static inline void xchrcat(char **dst, const char append, size_t *curr_len);
45 31
46/* variables to control behavior */ 32/* variables to control behavior */
33static char match_etypes[126] = "";
47static char *ldpaths[256]; 34static char *ldpaths[256];
48static char scan_ldpath = 0; 35static char scan_ldpath = 0;
49static char scan_envpath = 0; 36static char scan_envpath = 0;
50static char scan_symlink = 1; 37static char scan_symlink = 1;
38static char scan_archives = 0;
51static char dir_recurse = 0; 39static char dir_recurse = 0;
52static char dir_crossmount = 1; 40static char dir_crossmount = 1;
53static char show_pax = 0; 41static char show_pax = 0;
42static char show_perms = 0;
43static char show_size = 0;
54static char show_phdr = 0; 44static char show_phdr = 0;
55static char show_textrel = 0; 45static char show_textrel = 0;
56static char show_rpath = 0; 46static char show_rpath = 0;
57static char show_needed = 0; 47static char show_needed = 0;
58static char show_interp = 0; 48static char show_interp = 0;
59static char show_bind = 0; 49static char show_bind = 0;
60static char show_soname = 0; 50static char show_soname = 0;
61static char show_textrels = 0; 51static char show_textrels = 0;
62static char show_banner = 1; 52static char show_banner = 1;
53static char show_endian = 0;
54static char show_osabi = 0;
55static char show_eabi = 0;
63static char be_quiet = 0; 56static char be_quiet = 0;
64static char be_verbose = 0; 57static char be_verbose = 0;
65static char be_wewy_wewy_quiet = 0; 58static char be_wewy_wewy_quiet = 0;
66static char *find_sym = NULL, *versioned_symname = NULL; 59static char be_semi_verbose = 0;
60static char *find_sym = NULL;
67static char *find_lib = NULL; 61static char *find_lib = NULL;
62static char *find_section = NULL;
68static char *out_format = NULL; 63static char *out_format = NULL;
69static char *search_path = NULL; 64static char *search_path = NULL;
65static char fix_elf = 0;
70static char gmatch = 0; 66static char g_match = 0;
71static char printcache = 0; 67static char use_ldcache = 0;
72 68
69static char **qa_textrels = NULL;
70static char **qa_execstack = NULL;
71static char **qa_wx_load = NULL;
73 72
73static int match_bits = 0;
74static unsigned int match_perms = 0;
74caddr_t ldcache = 0; 75static caddr_t ldcache = 0;
75size_t ldcache_size = 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[__PAX_UTILS_PATH_MAX];
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}
76 128
77/* sub-funcs for scanelf_file() */ 129/* sub-funcs for scanelf_file() */
78static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab) 130static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
79{ 131{
80 /* find the best SHT_DYNSYM and SHT_STRTAB sections */ 132 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
99 } \ 151 } \
100 } 152 }
101 GET_SYMTABS(32) 153 GET_SYMTABS(32)
102 GET_SYMTABS(64) 154 GET_SYMTABS(64)
103} 155}
156
104static char *scanelf_file_pax(elfobj *elf, char *found_pax) 157static char *scanelf_file_pax(elfobj *elf, char *found_pax)
105{ 158{
106 static char ret[7]; 159 static char ret[7];
107 unsigned long i, shown; 160 unsigned long i, shown;
108 161
117 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 170 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
118 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 171 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
119 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 172 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
120 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \ 173 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
121 continue; \ 174 continue; \
122 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))) \
123 continue; \ 180 continue; \
124 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); \
125 *found_pax = 1; \ 182 *found_pax = 1; \
126 ++shown; \ 183 ++shown; \
127 break; \ 184 break; \
128 } \ 185 } \
129 } 186 }
130 SHOW_PAX(32) 187 SHOW_PAX(32)
131 SHOW_PAX(64) 188 SHOW_PAX(64)
189 }
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 }
132 } 200 }
133 201
134 /* fall back to EI_PAX if no PT_PAX was found */ 202 /* fall back to EI_PAX if no PT_PAX was found */
135 if (!*ret) { 203 if (!*ret) {
136 static char *paxflags; 204 static char *paxflags;
150 218
151static 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)
152{ 220{
153 static char ret[12]; 221 static char ret[12];
154 char *found; 222 char *found;
155 unsigned long i, shown;
156 unsigned char multi_stack, multi_relro, multi_load; 223 unsigned long i, shown, multi_stack, multi_relro, multi_load;
224 int max_pt_load;
157 225
158 if (!show_phdr) return NULL; 226 if (!show_phdr) return NULL;
159 227
160 memcpy(ret, "--- --- ---\0", 12); 228 memcpy(ret, "--- --- ---\0", 12);
161 229
162 shown = 0; 230 shown = 0;
163 multi_stack = multi_relro = multi_load = 0; 231 multi_stack = multi_relro = multi_load = 0;
232 max_pt_load = elf_max_pt_load(elf);
164 233
234#define NOTE_GNU_STACK ".note.GNU-stack"
165#define SHOW_PHDR(B) \ 235#define SHOW_PHDR(B) \
166 if (elf->elf_class == ELFCLASS ## B) { \ 236 if (elf->elf_class == ELFCLASS ## B) { \
167 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 237 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
168 Elf ## B ## _Off offset; \ 238 Elf ## B ## _Off offset; \
169 uint32_t flags, check_flags; \ 239 uint32_t flags, check_flags; \
170 if (elf->phdr != NULL) { \ 240 if (elf->phdr != NULL) { \
171 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 241 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
172 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \ 242 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
173 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \ 243 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
244 if (multi_stack++) \
174 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; \
175 found = found_phdr; \ 248 found = found_phdr; \
176 offset = 0; \ 249 offset = 0; \
177 check_flags = PF_X; \ 250 check_flags = PF_X; \
178 } 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++) \
179 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \ 253 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
180 found = found_relro; \ 254 found = found_relro; \
181 offset = 4; \ 255 offset = 4; \
182 check_flags = PF_X; \ 256 check_flags = PF_X; \
183 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \ 257 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
184 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; \
185 found = found_load; \ 263 found = found_load; \
186 offset = 8; \ 264 offset = 8; \
187 check_flags = PF_W|PF_X; \ 265 check_flags = PF_W|PF_X; \
188 } else \ 266 } else \
189 continue; \ 267 continue; \
190 flags = EGET(phdr[i].p_flags); \ 268 flags = EGET(phdr[i].p_flags); \
191 if (be_quiet && ((flags & check_flags) != check_flags)) \ 269 if (be_quiet && ((flags & check_flags) != check_flags)) \
192 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 } \
193 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \ 276 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
194 *found = 1; \ 277 *found = 1; \
195 ++shown; \ 278 ++shown; \
196 } \ 279 } \
197 } else if (elf->shdr != NULL) { \ 280 } else if (elf->shdr != NULL) { \
198 /* no program headers which means this is prob an object file */ \ 281 /* no program headers which means this is prob an object file */ \
199 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \ 282 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
200 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \ 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; \
201 check_flags = SHF_WRITE|SHF_EXECINSTR; \ 287 check_flags = SHF_WRITE|SHF_EXECINSTR; \
202 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \ 288 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
203 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \ 289 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
204 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \ 290 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
205 if (!strcmp((char*)(elf->data + offset), ".note.GNU-stack")) { \ 291 str = elf->data + offset; \
292 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
293 if (!strcmp(str, NOTE_GNU_STACK)) { \
206 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \ 294 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
207 flags = EGET(shdr[i].sh_flags); \ 295 flags = EGET(shdr[i].sh_flags); \
208 if (be_quiet && ((flags & check_flags) != check_flags)) \ 296 if (be_quiet && ((flags & check_flags) != check_flags)) \
209 continue; \ 297 continue; \
210 ++*found_phdr; \ 298 ++*found_phdr; \
214 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \ 302 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
215 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \ 303 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
216 break; \ 304 break; \
217 } \ 305 } \
218 } \ 306 } \
307 skip_this_shdr##B: \
219 if (!multi_stack) { \ 308 if (!multi_stack) { \
309 if (file_matches_list(elf->filename, qa_execstack)) \
310 return NULL; \
220 *found_phdr = 1; \ 311 *found_phdr = 1; \
221 shown = 1; \ 312 shown = 1; \
222 memcpy(ret, "!WX", 3); \ 313 memcpy(ret, "!WX", 3); \
223 } \ 314 } \
224 } \ 315 } \
229 if (be_wewy_wewy_quiet || (be_quiet && !shown)) 320 if (be_wewy_wewy_quiet || (be_quiet && !shown))
230 return NULL; 321 return NULL;
231 else 322 else
232 return ret; 323 return ret;
233} 324}
325
326/*
327 * See if this ELF contains a DT_TEXTREL tag in any of its
328 * PT_DYNAMIC sections.
329 */
234static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 330static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
235{ 331{
236 static const char *ret = "TEXTREL"; 332 static const char *ret = "TEXTREL";
237 unsigned long i; 333 unsigned long i;
238 334
239 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;
240 338
241 if (elf->phdr) { 339 if (elf->phdr) {
242#define SHOW_TEXTREL(B) \ 340#define SHOW_TEXTREL(B) \
243 if (elf->elf_class == ELFCLASS ## B) { \ 341 if (elf->elf_class == ELFCLASS ## B) { \
244 Elf ## B ## _Dyn *dyn; \ 342 Elf ## B ## _Dyn *dyn; \
245 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 343 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
246 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 344 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
247 Elf ## B ## _Off offset; \ 345 Elf ## B ## _Off offset; \
248 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 346 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
249 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; \
250 offset = EGET(phdr[i].p_offset); \ 348 offset = EGET(phdr[i].p_offset); \
251 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 349 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
252 dyn = DYN ## B (elf->data + offset); \ 350 dyn = DYN ## B (elf->data + offset); \
253 while (EGET(dyn->d_tag) != DT_NULL) { \ 351 while (EGET(dyn->d_tag) != DT_NULL) { \
254 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)*/ \
266 if (be_quiet || be_wewy_wewy_quiet) 364 if (be_quiet || be_wewy_wewy_quiet)
267 return NULL; 365 return NULL;
268 else 366 else
269 return " - "; 367 return " - ";
270} 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 */
271static 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)
272{ 376{
273 unsigned long s, r, rmax; 377 unsigned long s, r, rmax;
274 void *symtab_void, *strtab_void, *text_void; 378 void *symtab_void, *strtab_void, *text_void;
275 379
327 if (be_verbose <= 2) continue; \ 431 if (be_verbose <= 2) continue; \
328 } else \ 432 } else \
329 *found_textrels = 1; \ 433 *found_textrels = 1; \
330 /* locate this relocation symbol name */ \ 434 /* locate this relocation symbol name */ \
331 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 } \
332 sym_max = ELF ## B ## _R_SYM(r_info); \ 440 sym_max = ELF ## B ## _R_SYM(r_info); \
333 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \ 441 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
334 sym += sym_max; \ 442 sym += sym_max; \
335 else \ 443 else \
336 sym = NULL; \ 444 sym = NULL; \
338 /* show the raw details about this reloc */ \ 446 /* show the raw details about this reloc */ \
339 printf(" %s: ", elf->base_filename); \ 447 printf(" %s: ", elf->base_filename); \
340 if (sym && sym->st_name) \ 448 if (sym && sym->st_name) \
341 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))); \
342 else \ 450 else \
343 printf("(memory/fake?)"); \ 451 printf("(memory/data?)"); \
344 printf(" [0x%lX]", (unsigned long)r_offset); \ 452 printf(" [0x%lX]", (unsigned long)r_offset); \
345 /* 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 */ \
346 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 454 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
347 func = NULL; \ 455 func = NULL; \
348 offset_tmp = 0; \ 456 offset_tmp = 0; \
352 offset_tmp = EGET(sym->st_value); \ 460 offset_tmp = EGET(sym->st_value); \
353 } \ 461 } \
354 ++sym; \ 462 ++sym; \
355 } \ 463 } \
356 printf(" in "); \ 464 printf(" in "); \
357 if (func && func->st_name) \ 465 if (func && func->st_name) { \
358 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); \
359 else \ 469 else \
360 printf("(NULL: fake?)"); \ 470 printf("%s", func_name); \
471 } else \
472 printf("(optimized out)"); \
361 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 int sysret; \
479 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"; \
480 syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
481 sysbuf = xmalloc(syslen); \
482 if (end_addr < r_offset) \
483 /* not uncommon when things are optimized out */ \
484 end_addr = r_offset + 0x100; \
485 snprintf(sysbuf, syslen, sysfmt, \
486 (unsigned long)offset_tmp, \
487 (unsigned long)end_addr, \
488 elf->filename, \
489 (unsigned long)r_offset); \
490 fflush(stdout); \
491 sysret = system(sysbuf); \
492 fflush(stdout); \
493 free(sysbuf); \
494 } \
362 } \ 495 } \
363 } } 496 } }
364 SHOW_TEXTRELS(32) 497 SHOW_TEXTRELS(32)
365 SHOW_TEXTRELS(64) 498 SHOW_TEXTRELS(64)
366 } 499 }
368 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename); 501 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
369 502
370 return NULL; 503 return NULL;
371} 504}
372 505
373static void rpath_security_checks(elfobj *, char *); 506static void rpath_security_checks(elfobj *, char *, const char *);
374static void rpath_security_checks(elfobj *elf, char *item) { 507static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
508{
375 struct stat st; 509 struct stat st;
376 switch (*item) { 510 switch (*item) {
377 case '/': break; 511 case '/': break;
378 case '.': 512 case '.':
379 warnf("Security problem with relative RPATH '%s' in %s", item, elf->filename); 513 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
380 break; 514 break;
515 case ':':
381 case '\0': 516 case '\0':
382 warnf("Security problem NULL RPATH in %s", elf->filename); 517 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
383 break; 518 break;
384 case '$': 519 case '$':
385 if (fstat(elf->fd, &st) != -1) 520 if (fstat(elf->fd, &st) != -1)
386 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID)) 521 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
387 warnf("Security problem with RPATH='%s' in %s with mode set of %o", 522 warnf("Security problem with %s='%s' in %s with mode set of %o",
388 item, elf->filename, st.st_mode & 07777); 523 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
389 break; 524 break;
390 default: 525 default:
391 warnf("Maybe? sec problem with RPATH='%s' in %s", item, elf->filename); 526 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
392 break; 527 break;
393 } 528 }
394} 529}
395static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len) 530static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
396{ 531{
413 Elf ## B ## _Off offset; \ 548 Elf ## B ## _Off offset; \
414 Elf ## B ## _Xword word; \ 549 Elf ## B ## _Xword word; \
415 /* Scan all the program headers */ \ 550 /* Scan all the program headers */ \
416 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 551 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
417 /* Just scan dynamic headers */ \ 552 /* Just scan dynamic headers */ \
418 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 553 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
419 offset = EGET(phdr[i].p_offset); \ 554 offset = EGET(phdr[i].p_offset); \
420 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 555 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
421 /* Just scan dynamic RPATH/RUNPATH headers */ \ 556 /* Just scan dynamic RPATH/RUNPATH headers */ \
422 dyn = DYN ## B (elf->data + offset); \ 557 dyn = DYN ## B (elf->data + offset); \
423 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \ 558 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
432 /* Verify the memory is somewhat sane */ \ 567 /* Verify the memory is somewhat sane */ \
433 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 568 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
434 if (offset < (Elf ## B ## _Off)elf->len) { \ 569 if (offset < (Elf ## B ## _Off)elf->len) { \
435 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \ 570 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
436 *r = (char*)(elf->data + offset); \ 571 *r = (char*)(elf->data + offset); \
572 /* cache the length in case we need to nuke this section later on */ \
573 if (fix_elf) \
574 offset = strlen(*r); \
437 /* If quiet, don't output paths in ld.so.conf */ \ 575 /* If quiet, don't output paths in ld.so.conf */ \
438 if (be_quiet) { \ 576 if (be_quiet) { \
439 size_t len; \ 577 size_t len; \
440 char *start, *end; \ 578 char *start, *end; \
441 /* note that we only 'chop' off leading known paths. */ \ 579 /* note that we only 'chop' off leading known paths. */ \
442 /* since *r is read-only memory, we can only move the ptr forward. */ \ 580 /* since *r is read-only memory, we can only move the ptr forward. */ \
443 start = *r; \ 581 start = *r; \
444 /* scan each path in : delimited list */ \ 582 /* scan each path in : delimited list */ \
445 while (start) { \ 583 while (start) { \
446 rpath_security_checks(elf, start); \ 584 rpath_security_checks(elf, start, get_elfdtype(word)); \
447 end = strchr(start, ':'); \ 585 end = strchr(start, ':'); \
448 len = (end ? abs(end - start) : strlen(start)); \ 586 len = (end ? abs(end - start) : strlen(start)); \
587 if (use_ldcache) \
449 for (s = 0; ldpaths[s]; ++s) { \ 588 for (s = 0; ldpaths[s]; ++s) \
450 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \ 589 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
451 *r = (end ? end + 1 : NULL); \ 590 *r = end; \
591 /* corner case ... if RPATH reads "/usr/lib:", we want \
592 * to show ':' rather than '' */ \
593 if (end && end[1] != '\0') \
594 (*r)++; \
452 break; \ 595 break; \
453 } \ 596 } \
454 } \
455 if (!*r || !ldpaths[s] || !end) \ 597 if (!*r || !end) \
456 start = NULL; \ 598 break; \
457 else \ 599 else \
458 start = start + len + 1; \ 600 start = start + len + 1; \
459 } \ 601 } \
460 } \ 602 } \
603 if (*r) { \
604 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
605 /* just nuke it */ \
606 nuke_it##B: \
607 memset(*r, 0x00, offset); \
608 *r = NULL; \
609 ESET(dyn->d_tag, DT_DEBUG); \
610 ESET(dyn->d_un.d_ptr, 0); \
611 } else if (fix_elf) { \
612 /* try to clean "bad" paths */ \
613 size_t len, tmpdir_len; \
614 char *start, *end; \
615 const char *tmpdir; \
616 start = *r; \
617 tmpdir = (getenv("TMPDIR") ? : "."); \
618 tmpdir_len = strlen(tmpdir); \
619 while (1) { \
620 end = strchr(start, ':'); \
621 if (start == end) { \
622 eat_this_path##B: \
623 len = strlen(end); \
624 memmove(start, end+1, len); \
625 start[len-1] = '\0'; \
626 end = start - 1; \
627 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
628 if (!end) { \
629 if (start == *r) \
630 goto nuke_it##B; \
631 *--start = '\0'; \
632 } else \
633 goto eat_this_path##B; \
634 } \
635 if (!end) \
636 break; \
637 start = end + 1; \
638 } \
639 if (**r == '\0') \
640 goto nuke_it##B; \
641 } \
642 if (*r) \
461 if (*r) *found_rpath = 1; \ 643 *found_rpath = 1; \
644 } \
462 } \ 645 } \
463 ++dyn; \ 646 ++dyn; \
464 } \ 647 } \
465 } } 648 } }
466 SHOW_RPATH(32) 649 SHOW_RPATH(32)
488 671
489#define LDSO_CACHE_MAGIC "ld.so-" 672#define LDSO_CACHE_MAGIC "ld.so-"
490#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1) 673#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
491#define LDSO_CACHE_VER "1.7.0" 674#define LDSO_CACHE_VER "1.7.0"
492#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1) 675#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
676#define FLAG_ANY -1
677#define FLAG_TYPE_MASK 0x00ff
678#define FLAG_LIBC4 0x0000
679#define FLAG_ELF 0x0001
680#define FLAG_ELF_LIBC5 0x0002
681#define FLAG_ELF_LIBC6 0x0003
682#define FLAG_REQUIRED_MASK 0xff00
683#define FLAG_SPARC_LIB64 0x0100
684#define FLAG_IA64_LIB64 0x0200
685#define FLAG_X8664_LIB64 0x0300
686#define FLAG_S390_LIB64 0x0400
687#define FLAG_POWERPC_LIB64 0x0500
688#define FLAG_MIPS64_LIBN32 0x0600
689#define FLAG_MIPS64_LIBN64 0x0700
493 690
494static char *lookup_cache_lib(char *); 691static char *lookup_cache_lib(elfobj *, char *);
692
693#if defined(__GLIBC__) || defined(__UCLIBC__)
694
495static char *lookup_cache_lib(char *fname) 695static char *lookup_cache_lib(elfobj *elf, char *fname)
496{ 696{
497 int fd = 0; 697 int fd = 0;
498 char *strs; 698 char *strs;
499 static char buf[_POSIX_PATH_MAX] = ""; 699 static char buf[__PAX_UTILS_PATH_MAX] = "";
500 const char *cachefile = "/etc/ld.so.cache"; 700 const char *cachefile = "/etc/ld.so.cache";
501 struct stat st; 701 struct stat st;
502 702
503 typedef struct { 703 typedef struct {
504 char magic[LDSO_CACHE_MAGIC_LEN]; 704 char magic[LDSO_CACHE_MAGIC_LEN];
505 char version[LDSO_CACHE_VER_LEN]; 705 char version[LDSO_CACHE_VER_LEN];
506 int nlibs; 706 int nlibs;
507 } header_t; 707 } header_t;
708 header_t *header;
508 709
509 typedef struct { 710 typedef struct {
510 int flags; 711 int flags;
511 int sooffset; 712 int sooffset;
512 int liboffset; 713 int liboffset;
513 } libentry_t; 714 } libentry_t;
514
515 header_t *header;
516 libentry_t *libent; 715 libentry_t *libent;
517 716
518 if (fname == NULL) 717 if (fname == NULL)
519 return NULL; 718 return NULL;
520 719
521 if (ldcache == 0) { 720 if (ldcache == 0) {
522 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) < 0) 721 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1)
523 return NULL; 722 return NULL;
524 /* save the cache size for latter unmapping */ 723
724 /* cache these values so we only map/unmap the cache file once */
525 ldcache_size = st.st_size; 725 ldcache_size = st.st_size;
526
527 if ((ldcache = mmap(0, st.st_size, PROT_READ, MAP_SHARED, fd, 0)) == (caddr_t) -1) 726 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
727
728 close(fd);
729
730 if (ldcache == MAP_FAILED) {
731 ldcache = 0;
528 return NULL; 732 return NULL;
529 733 }
530 close(fd);
531 734
532 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN)) 735 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
533 return NULL; 736 return NULL;
534
535 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN)) 737 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
536 return NULL; 738 return NULL;
537 } 739 }
538 740
539 header = (header_t *) ldcache; 741 header = (header_t *) ldcache;
540 libent = (libentry_t *) (ldcache + sizeof(header_t)); 742 libent = (libentry_t *) (ldcache + sizeof(header_t));
541 strs = (char *) &libent[header->nlibs]; 743 strs = (char *) &libent[header->nlibs];
542 744
543 for (fd = 0; fd < header->nlibs; fd++) { 745 for (fd = 0; fd < header->nlibs; fd++) {
746 /* this should be more fine grained, but for now we assume that
747 * diff arches will not be cached together. and we ignore the
748 * the different multilib mips cases. */
749 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
750 continue;
751 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
752 continue;
753
544 if (strcmp(fname, strs + libent[fd].sooffset) != 0) 754 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
545 continue; 755 continue;
546 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf)); 756 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
547 } 757 }
548 return buf; 758 return buf;
549} 759}
760#elif defined(__NetBSD__)
761static char *lookup_cache_lib(elfobj *elf, char *fname)
762{
763 static char buf[__PAX_UTILS_PATH_MAX] = "";
764 static struct stat st;
550 765
766 char **ldpath;
767 for (ldpath = ldpaths; *ldpath != NULL; ldpath++) {
768 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", *ldpath, fname) >= sizeof(buf))
769 continue; /* if the pathname is too long, or something went wrong, ignore */
770
771 if (stat(buf, &st) != 0)
772 continue; /* if the lib doesn't exist in *ldpath, look further */
773
774 /* NetBSD doesn't actually do sanity checks, it just loads the file
775 * and if that doesn't work, continues looking in other directories.
776 * This cannot easily be safely emulated, unfortunately. For now,
777 * just assume that if it exists, it's a valid library. */
778
779 return buf;
780 }
781
782 /* not found in any path */
783 return NULL;
784}
785#else
786#ifdef __ELF__
787#warning Cache support not implemented for your target
788#endif
789static char *lookup_cache_lib(elfobj *elf, char *fname)
790{
791 return NULL;
792}
793#endif
551 794
552static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len) 795static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
553{ 796{
554 unsigned long i; 797 unsigned long i;
555 char *needed; 798 char *needed;
567 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 810 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
568 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 811 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
569 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 812 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
570 Elf ## B ## _Off offset; \ 813 Elf ## B ## _Off offset; \
571 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 814 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
572 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 815 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
573 offset = EGET(phdr[i].p_offset); \ 816 offset = EGET(phdr[i].p_offset); \
574 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 817 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
575 dyn = DYN ## B (elf->data + offset); \ 818 dyn = DYN ## B (elf->data + offset); \
576 while (EGET(dyn->d_tag) != DT_NULL) { \ 819 while (EGET(dyn->d_tag) != DT_NULL) { \
577 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 820 if (EGET(dyn->d_tag) == DT_NEEDED) { \
582 } \ 825 } \
583 needed = (char*)(elf->data + offset); \ 826 needed = (char*)(elf->data + offset); \
584 if (op == 0) { \ 827 if (op == 0) { \
585 if (!be_wewy_wewy_quiet) { \ 828 if (!be_wewy_wewy_quiet) { \
586 if (*found_needed) xchrcat(ret, ',', ret_len); \ 829 if (*found_needed) xchrcat(ret, ',', ret_len); \
587 if (printcache) \ 830 if (use_ldcache) \
588 if ((p = lookup_cache_lib(needed)) != NULL) \ 831 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
589 needed = p; \ 832 needed = p; \
590 xstrcat(ret, needed, ret_len); \ 833 xstrcat(ret, needed, ret_len); \
591 } \ 834 } \
592 *found_needed = 1; \ 835 *found_needed = 1; \
593 } else { \ 836 } else { \
594 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \ 837 if (!strncmp(find_lib, needed, strlen( !g_match ? needed : find_lib))) { \
595 *found_lib = 1; \ 838 *found_lib = 1; \
596 return (be_wewy_wewy_quiet ? NULL : needed); \ 839 return (be_wewy_wewy_quiet ? NULL : needed); \
597 } \ 840 } \
598 } \ 841 } \
599 } \ 842 } \
630} 873}
631static char *scanelf_file_bind(elfobj *elf, char *found_bind) 874static char *scanelf_file_bind(elfobj *elf, char *found_bind)
632{ 875{
633 unsigned long i; 876 unsigned long i;
634 struct stat s; 877 struct stat s;
878 char dynamic = 0;
635 879
636 if (!show_bind) return NULL; 880 if (!show_bind) return NULL;
637 if (!elf->phdr) return NULL; 881 if (!elf->phdr) return NULL;
638 882
639#define SHOW_BIND(B) \ 883#define SHOW_BIND(B) \
641 Elf ## B ## _Dyn *dyn; \ 885 Elf ## B ## _Dyn *dyn; \
642 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 886 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
643 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 887 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
644 Elf ## B ## _Off offset; \ 888 Elf ## B ## _Off offset; \
645 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 889 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
646 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 890 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
891 dynamic = 1; \
647 offset = EGET(phdr[i].p_offset); \ 892 offset = EGET(phdr[i].p_offset); \
648 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 893 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
649 dyn = DYN ## B (elf->data + offset); \ 894 dyn = DYN ## B (elf->data + offset); \
650 while (EGET(dyn->d_tag) != DT_NULL) { \ 895 while (EGET(dyn->d_tag) != DT_NULL) { \
651 if (EGET(dyn->d_tag) == DT_BIND_NOW || \ 896 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
662 SHOW_BIND(32) 907 SHOW_BIND(32)
663 SHOW_BIND(64) 908 SHOW_BIND(64)
664 909
665 if (be_wewy_wewy_quiet) return NULL; 910 if (be_wewy_wewy_quiet) return NULL;
666 911
912 /* don't output anything if quiet mode and the ELF is static or not setuid */
667 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) { 913 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
668 return NULL; 914 return NULL;
669 } else { 915 } else {
670 *found_bind = 1; 916 *found_bind = 1;
671 return (char *) "LAZY"; 917 return (char *) (dynamic ? "LAZY" : "STATIC");
672 } 918 }
673} 919}
674static char *scanelf_file_soname(elfobj *elf, char *found_soname) 920static char *scanelf_file_soname(elfobj *elf, char *found_soname)
675{ 921{
676 unsigned long i; 922 unsigned long i;
688 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 934 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
689 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 935 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
690 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 936 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
691 Elf ## B ## _Off offset; \ 937 Elf ## B ## _Off offset; \
692 /* only look for soname in shared objects */ \ 938 /* only look for soname in shared objects */ \
693 if (ehdr->e_type != ET_DYN) \ 939 if (EGET(ehdr->e_type) != ET_DYN) \
694 return NULL; \ 940 return NULL; \
695 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 941 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
696 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 942 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
697 offset = EGET(phdr[i].p_offset); \ 943 offset = EGET(phdr[i].p_offset); \
698 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 944 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
699 dyn = DYN ## B (elf->data + offset); \ 945 dyn = DYN ## B (elf->data + offset); \
700 while (EGET(dyn->d_tag) != DT_NULL) { \ 946 while (EGET(dyn->d_tag) != DT_NULL) { \
701 if (EGET(dyn->d_tag) == DT_SONAME) { \ 947 if (EGET(dyn->d_tag) == DT_SONAME) { \
715 SHOW_SONAME(64) 961 SHOW_SONAME(64)
716 } 962 }
717 963
718 return NULL; 964 return NULL;
719} 965}
966
967static int scanelf_match_symname(const char *symname, const char *tomatch) {
968 /* We do things differently when checking with regexp */
969 if (g_match) {
970 return rematch(symname, tomatch, REG_EXTENDED) == 0;
971 } else {
972 const size_t symname_len = strlen(symname);
973 return (strncmp(symname, tomatch, symname_len) == 0 &&
974 /* Accept unversioned symbol names */
975 (tomatch[symname_len] == '\0' || tomatch[symname_len] == '@'));
976 }
977}
978
720static char *scanelf_file_sym(elfobj *elf, char *found_sym) 979static char *scanelf_file_sym(elfobj *elf, char *found_sym)
721{ 980{
722 unsigned long i; 981 unsigned long i;
723 char *ret; 982 char *ret;
724 void *symtab_void, *strtab_void; 983 void *symtab_void, *strtab_void;
732#define FIND_SYM(B) \ 991#define FIND_SYM(B) \
733 if (elf->elf_class == ELFCLASS ## B) { \ 992 if (elf->elf_class == ELFCLASS ## B) { \
734 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 993 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
735 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 994 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
736 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 995 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
737 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 996 unsigned long cnt = EGET(symtab->sh_entsize); \
738 char *symname; \ 997 char *symname; \
998 if (cnt) \
999 cnt = EGET(symtab->sh_size) / cnt; \
739 for (i = 0; i < cnt; ++i) { \ 1000 for (i = 0; i < cnt; ++i) { \
1001 if ((void*)sym > (void*)elf->data_end) { \
1002 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1003 goto break_out; \
1004 } \
740 if (sym->st_name) { \ 1005 if (sym->st_name) { \
1006 /* make sure the symbol name is in acceptable memory range */ \
741 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 1007 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
742 if (*find_sym == '*') { \ 1008 if ((void*)symname > (void*)elf->data_end) { \
1009 warnf("%s: corrupt ELF symbols", elf->filename); \
1010 ++sym; \
1011 continue; \
1012 } \
1013 /* debug display ... show all symbols and some extra info */ \
1014 if (0 && g_match ? rematch(ret, symname, REG_EXTENDED) == 0 : *ret == '*') { \
743 printf("%s(%s) %5lX %15s %s\n", \ 1015 printf("%s(%s) %5lX %15s %s %s\n", \
744 ((*found_sym == 0) ? "\n\t" : "\t"), \ 1016 ((*found_sym == 0) ? "\n\t" : "\t"), \
745 elf->base_filename, \ 1017 elf->base_filename, \
746 (unsigned long)sym->st_size, \ 1018 (unsigned long)sym->st_size, \
747 get_elfstttype(sym->st_info), \ 1019 get_elfstttype(sym->st_info), \
748 symname); \ 1020 sym->st_shndx == SHN_UNDEF ? "U" : "D", symname); \
749 *found_sym = 1; \ 1021 *found_sym = 1; \
750 } else { \ 1022 } else { \
1023 /* allow the user to specify a comma delimited list of symbols to search for */ \
751 char *this_sym, *next_sym; \ 1024 char *this_sym, *next_sym; \
1025 next_sym = ret; \
1026 while (next_sym) { \
752 this_sym = find_sym; \ 1027 this_sym = next_sym; \
753 do { \
754 next_sym = strchr(this_sym, ','); \ 1028 if ((next_sym = strchr(this_sym, ','))) \
755 if (next_sym == NULL) \ 1029 next_sym += 1; /* Skip the comma */ \
756 next_sym = this_sym + strlen(this_sym); \ 1030 /* do we want a defined symbol ? */ \
757 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \ 1031 if (*this_sym == '+') { \
758 (strcmp(symname, versioned_symname) == 0)) { \ 1032 if (sym->st_shndx == SHN_UNDEF) \
1033 continue; \
759 ret = this_sym; \ 1034 ++this_sym; \
1035 /* do we want an undefined symbol ? */ \
1036 } else if (*this_sym == '-') { \
1037 if (sym->st_shndx != SHN_UNDEF) \
1038 continue; \
1039 ++this_sym; \
1040 } \
1041 if (next_sym) /* Copy it so that we don't have to worry about the final , */ \
1042 this_sym = xstrndup(this_sym, next_sym-this_sym); \
1043 /* ok, lets compare the name now */ \
1044 if (scanelf_match_symname(this_sym, symname)) { \
1045 if (be_semi_verbose) { \
1046 char buf[126]; \
1047 snprintf(buf, sizeof(buf), "%lX %s %s", \
1048 (unsigned long)sym->st_size, get_elfstttype(sym->st_info), this_sym); \
1049 ret = buf; \
1050 } else \
1051 ret = symname; \
760 (*found_sym)++; \ 1052 (*found_sym)++; \
761 goto break_out; \ 1053 goto break_out; \
762 } \ 1054 } \
763 this_sym = next_sym + 1; \ 1055 if (next_sym) free(this_sym); \
764 } while (*next_sym != '\0'); \ 1056 } \
765 } \ 1057 } \
766 } \ 1058 } \
767 ++sym; \ 1059 ++sym; \
768 } } 1060 } }
769 FIND_SYM(32) 1061 FIND_SYM(32)
778 if (be_quiet) 1070 if (be_quiet)
779 return NULL; 1071 return NULL;
780 else 1072 else
781 return (char *)" - "; 1073 return (char *)" - ";
782} 1074}
1075
1076static char *scanelf_file_sections(elfobj *elf, char *found_section)
1077{
1078 if (!find_section)
1079 return NULL;
1080
1081#define FIND_SECTION(B) \
1082 if (elf->elf_class == ELFCLASS ## B) { \
1083 int invert; \
1084 Elf ## B ## _Shdr *section; \
1085 invert = (*find_section == '!' ? 1 : 0); \
1086 section = SHDR ## B (elf_findsecbyname(elf, find_section+invert)); \
1087 if ((section == NULL && invert) || (section != NULL && !invert)) \
1088 *found_section = 1; \
1089 }
1090 FIND_SECTION(32)
1091 FIND_SECTION(64)
1092
1093 if (be_wewy_wewy_quiet)
1094 return NULL;
1095
1096 if (*found_section)
1097 return find_section;
1098
1099 if (be_quiet)
1100 return NULL;
1101 else
1102 return (char *)" - ";
1103}
1104
783/* scan an elf file and show all the fun stuff */ 1105/* scan an elf file and show all the fun stuff */
784#define prints(str) write(fileno(stdout), str, strlen(str)) 1106#define prints(str) write(fileno(stdout), str, strlen(str))
785static void scanelf_file(const char *filename) 1107static int scanelf_elfobj(elfobj *elf)
786{ 1108{
787 unsigned long i; 1109 unsigned long i;
788 char found_pax, found_phdr, found_relro, found_load, found_textrel, 1110 char found_pax, found_phdr, found_relro, found_load, found_textrel,
789 found_rpath, found_needed, found_interp, found_bind, found_soname, 1111 found_rpath, found_needed, found_interp, found_bind, found_soname,
790 found_sym, found_lib, found_file, found_textrels; 1112 found_sym, found_lib, found_file, found_textrels, found_section;
791 elfobj *elf;
792 struct stat st;
793 static char *out_buffer = NULL; 1113 static char *out_buffer = NULL;
794 static size_t out_len; 1114 static size_t out_len;
795 1115
796 /* make sure 'filename' exists */
797 if (lstat(filename, &st) == -1) {
798 if (be_verbose > 2) printf("%s: does not exist\n", filename);
799 return;
800 }
801 /* always handle regular files and handle symlinked files if no -y */
802 if (S_ISLNK(st.st_mode)) {
803 if (!scan_symlink) return;
804 stat(filename, &st);
805 }
806 if (!S_ISREG(st.st_mode)) {
807 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
808 return;
809 }
810
811 found_pax = found_phdr = found_relro = found_load = found_textrel = \ 1116 found_pax = found_phdr = found_relro = found_load = found_textrel = \
812 found_rpath = found_needed = found_interp = found_bind = found_soname = \ 1117 found_rpath = found_needed = found_interp = found_bind = found_soname = \
813 found_sym = found_lib = found_file = found_textrels = 0; 1118 found_sym = found_lib = found_file = found_textrels = found_section = 0;
814 1119
815 /* verify this is real ELF */
816 if ((elf = readelf(filename)) == NULL) {
817 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
818 return;
819 }
820
821 if (be_verbose > 1) 1120 if (be_verbose > 2)
822 printf("%s: scanning file {%s,%s}\n", filename, 1121 printf("%s: scanning file {%s,%s}\n", elf->filename,
823 get_elfeitype(EI_CLASS, elf->elf_class), 1122 get_elfeitype(EI_CLASS, elf->elf_class),
824 get_elfeitype(EI_DATA, elf->data[EI_DATA])); 1123 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
825 else if (be_verbose) 1124 else if (be_verbose > 1)
826 printf("%s: scanning file\n", filename); 1125 printf("%s: scanning file\n", elf->filename);
827 1126
828 /* init output buffer */ 1127 /* init output buffer */
829 if (!out_buffer) { 1128 if (!out_buffer) {
830 out_len = sizeof(char) * 80; 1129 out_len = sizeof(char) * 80;
831 out_buffer = (char*)xmalloc(out_len); 1130 out_buffer = xmalloc(out_len);
832 } 1131 }
833 *out_buffer = '\0'; 1132 *out_buffer = '\0';
834 1133
835 /* show the header */ 1134 /* show the header */
836 if (!be_quiet && show_banner) { 1135 if (!be_quiet && show_banner) {
837 for (i = 0; out_format[i]; ++i) { 1136 for (i = 0; out_format[i]; ++i) {
838 if (!IS_MODIFIER(out_format[i])) continue; 1137 if (!IS_MODIFIER(out_format[i])) continue;
839 1138
840 switch (out_format[++i]) { 1139 switch (out_format[++i]) {
1140 case '+': break;
841 case '%': break; 1141 case '%': break;
842 case '#': break; 1142 case '#': break;
843 case 'F': 1143 case 'F':
844 case 'p': 1144 case 'p':
845 case 'f': prints("FILE "); found_file = 1; break; 1145 case 'f': prints("FILE "); found_file = 1; break;
846 case 'o': prints(" TYPE "); break; 1146 case 'o': prints(" TYPE "); break;
847 case 'x': prints(" PAX "); break; 1147 case 'x': prints(" PAX "); break;
848 case 'e': prints("STK/REL/PTL "); break; 1148 case 'e': prints("STK/REL/PTL "); break;
849 case 't': prints("TEXTREL "); break; 1149 case 't': prints("TEXTREL "); break;
850 case 'r': prints("RPATH "); break; 1150 case 'r': prints("RPATH "); break;
1151 case 'M': prints("CLASS "); break;
851 case 'n': prints("NEEDED "); break; 1152 case 'n': prints("NEEDED "); break;
852 case 'i': prints("INTERP "); break; 1153 case 'i': prints("INTERP "); break;
853 case 'b': prints("BIND "); break; 1154 case 'b': prints("BIND "); break;
1155 case 'Z': prints("SIZE "); break;
854 case 'S': prints("SONAME "); break; 1156 case 'S': prints("SONAME "); break;
855 case 's': prints("SYM "); break; 1157 case 's': prints("SYM "); break;
856 case 'N': prints("LIB "); break; 1158 case 'N': prints("LIB "); break;
857 case 'T': prints("TEXTRELS "); break; 1159 case 'T': prints("TEXTRELS "); break;
1160 case 'k': prints("SECTION "); break;
1161 case 'a': prints("ARCH "); break;
1162 case 'I': prints("OSABI "); break;
1163 case 'Y': prints("EABI "); break;
1164 case 'O': prints("PERM "); break;
1165 case 'D': prints("ENDIAN "); break;
858 default: warnf("'%c' has no title ?", out_format[i]); 1166 default: warnf("'%c' has no title ?", out_format[i]);
859 } 1167 }
860 } 1168 }
861 if (!found_file) prints("FILE "); 1169 if (!found_file) prints("FILE ");
862 prints("\n"); 1170 prints("\n");
866 1174
867 /* dump all the good stuff */ 1175 /* dump all the good stuff */
868 for (i = 0; out_format[i]; ++i) { 1176 for (i = 0; out_format[i]; ++i) {
869 const char *out; 1177 const char *out;
870 const char *tmp; 1178 const char *tmp;
871 1179 static char ubuf[sizeof(unsigned long)*2];
872 /* make sure we trim leading spaces in quiet mode */
873 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
874 *out_buffer = '\0';
875
876 if (!IS_MODIFIER(out_format[i])) { 1180 if (!IS_MODIFIER(out_format[i])) {
877 xchrcat(&out_buffer, out_format[i], &out_len); 1181 xchrcat(&out_buffer, out_format[i], &out_len);
878 continue; 1182 continue;
879 } 1183 }
880 1184
881 out = NULL; 1185 out = NULL;
882 be_wewy_wewy_quiet = (out_format[i] == '#'); 1186 be_wewy_wewy_quiet = (out_format[i] == '#');
1187 be_semi_verbose = (out_format[i] == '+');
883 switch (out_format[++i]) { 1188 switch (out_format[++i]) {
1189 case '+':
884 case '%': 1190 case '%':
885 case '#': 1191 case '#':
886 xchrcat(&out_buffer, out_format[i], &out_len); break; 1192 xchrcat(&out_buffer, out_format[i], &out_len); break;
887 case 'F': 1193 case 'F':
888 found_file = 1; 1194 found_file = 1;
889 if (be_wewy_wewy_quiet) break; 1195 if (be_wewy_wewy_quiet) break;
890 xstrcat(&out_buffer, filename, &out_len); 1196 xstrcat(&out_buffer, elf->filename, &out_len);
891 break; 1197 break;
892 case 'p': 1198 case 'p':
893 found_file = 1; 1199 found_file = 1;
894 if (be_wewy_wewy_quiet) break; 1200 if (be_wewy_wewy_quiet) break;
895 tmp = filename; 1201 tmp = elf->filename;
896 if (search_path) { 1202 if (search_path) {
897 ssize_t len_search = strlen(search_path); 1203 ssize_t len_search = strlen(search_path);
898 ssize_t len_file = strlen(filename); 1204 ssize_t len_file = strlen(elf->filename);
899 if (!strncmp(filename, search_path, len_search) && \ 1205 if (!strncmp(elf->filename, search_path, len_search) && \
900 len_file > len_search) 1206 len_file > len_search)
901 tmp += len_search; 1207 tmp += len_search;
902 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++; 1208 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
903 } 1209 }
904 xstrcat(&out_buffer, tmp, &out_len); 1210 xstrcat(&out_buffer, tmp, &out_len);
905 break; 1211 break;
906 case 'f': 1212 case 'f':
907 found_file = 1; 1213 found_file = 1;
908 if (be_wewy_wewy_quiet) break; 1214 if (be_wewy_wewy_quiet) break;
909 tmp = strrchr(filename, '/'); 1215 tmp = strrchr(elf->filename, '/');
910 tmp = (tmp == NULL ? filename : tmp+1); 1216 tmp = (tmp == NULL ? elf->filename : tmp+1);
911 xstrcat(&out_buffer, tmp, &out_len); 1217 xstrcat(&out_buffer, tmp, &out_len);
912 break; 1218 break;
913 case 'o': out = get_elfetype(elf); break; 1219 case 'o': out = get_elfetype(elf); break;
914 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1220 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
915 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break; 1221 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
916 case 't': out = scanelf_file_textrel(elf, &found_textrel); break; 1222 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
917 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break; 1223 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
918 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break; 1224 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1225 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1226 case 'D': out = get_endian(elf); break;
1227 case 'O': out = strfileperms(elf->filename); break;
919 case 'n': 1228 case 'n':
920 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break; 1229 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
921 case 'i': out = scanelf_file_interp(elf, &found_interp); break; 1230 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
922 case 'b': out = scanelf_file_bind(elf, &found_bind); break; 1231 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
923 case 'S': out = scanelf_file_soname(elf, &found_soname); break; 1232 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
924 case 's': out = scanelf_file_sym(elf, &found_sym); break; 1233 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1234 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1235 case 'a': out = get_elfemtype(elf); break;
1236 case 'I': out = get_elfosabi(elf); break;
1237 case 'Y': out = get_elf_eabi(elf); break;
1238 case 'Z': snprintf(ubuf, sizeof(ubuf), "%lu", (unsigned long)elf->len); out = ubuf; break;;
925 default: warnf("'%c' has no scan code?", out_format[i]); 1239 default: warnf("'%c' has no scan code?", out_format[i]);
926 } 1240 }
927 if (out) { 1241 if (out) {
928 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */ 1242 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
929 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL) 1243 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
934 } 1248 }
935 1249
936#define FOUND_SOMETHING() \ 1250#define FOUND_SOMETHING() \
937 (found_pax || found_phdr || found_relro || found_load || found_textrel || \ 1251 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
938 found_rpath || found_needed || found_interp || found_bind || \ 1252 found_rpath || found_needed || found_interp || found_bind || \
939 found_soname || found_sym || found_lib || found_textrels) 1253 found_soname || found_sym || found_lib || found_textrels || found_section )
940 1254
941 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) { 1255 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
942 xchrcat(&out_buffer, ' ', &out_len); 1256 xchrcat(&out_buffer, ' ', &out_len);
943 xstrcat(&out_buffer, filename, &out_len); 1257 xstrcat(&out_buffer, elf->filename, &out_len);
944 } 1258 }
945 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) { 1259 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
946 puts(out_buffer); 1260 puts(out_buffer);
947 fflush(stdout); 1261 fflush(stdout);
948 } 1262 }
949 1263
1264 return 0;
1265}
1266
1267/* scan a single elf */
1268static int scanelf_elf(const char *filename, int fd, size_t len)
1269{
1270 int ret = 1;
1271 elfobj *elf;
1272
1273 /* verify this is real ELF */
1274 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1275 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1276 return ret;
1277 }
1278 switch (match_bits) {
1279 case 32:
1280 if (elf->elf_class != ELFCLASS32)
1281 goto label_done;
1282 break;
1283 case 64:
1284 if (elf->elf_class != ELFCLASS64)
1285 goto label_done;
1286 break;
1287 default: break;
1288 }
1289 if (strlen(match_etypes)) {
1290 char sbuf[126];
1291 strncpy(sbuf, match_etypes, sizeof(sbuf));
1292 if (strchr(match_etypes, ',') != NULL) {
1293 char *p;
1294 while ((p = strrchr(sbuf, ',')) != NULL) {
1295 *p = 0;
1296 if (etype_lookup(p+1) == get_etype(elf))
1297 goto label_ret;
1298 }
1299 }
1300 if (etype_lookup(sbuf) != get_etype(elf))
1301 goto label_done;
1302 }
1303
1304label_ret:
1305 ret = scanelf_elfobj(elf);
1306
1307label_done:
950 unreadelf(elf); 1308 unreadelf(elf);
1309 return ret;
1310}
1311
1312/* scan an archive of elfs */
1313static int scanelf_archive(const char *filename, int fd, size_t len)
1314{
1315 archive_handle *ar;
1316 archive_member *m;
1317 char *ar_buffer;
1318 elfobj *elf;
1319
1320 ar = ar_open_fd(filename, fd);
1321 if (ar == NULL)
1322 return 1;
1323
1324 ar_buffer = mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1325 while ((m=ar_next(ar)) != NULL) {
1326 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size);
1327 if (elf) {
1328 scanelf_elfobj(elf);
1329 unreadelf(elf);
1330 }
1331 }
1332 munmap(ar_buffer, len);
1333
1334 return 0;
1335}
1336/* scan a file which may be an elf or an archive or some other magical beast */
1337static int scanelf_file(const char *filename, const struct stat *st_cache)
1338{
1339 const struct stat *st = st_cache;
1340 struct stat symlink_st;
1341 int fd;
1342
1343 /* always handle regular files and handle symlinked files if no -y */
1344 if (S_ISLNK(st->st_mode)) {
1345 if (!scan_symlink) return 1;
1346 stat(filename, &symlink_st);
1347 st = &symlink_st;
1348 }
1349
1350 if (!S_ISREG(st->st_mode)) {
1351 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1352 return 1;
1353 }
1354
1355 if (match_perms) {
1356 if ((st->st_mode | match_perms) != st->st_mode)
1357 return 1;
1358 }
1359 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1360 return 1;
1361
1362 if (scanelf_elf(filename, fd, st->st_size) == 1 && scan_archives)
1363 /* if it isn't an ELF, maybe it's an .a archive */
1364 scanelf_archive(filename, fd, st->st_size);
1365
1366 close(fd);
1367 return 0;
951} 1368}
952 1369
953/* scan a directory for ET_EXEC files and print when we find one */ 1370/* scan a directory for ET_EXEC files and print when we find one */
954static void scanelf_dir(const char *path) 1371static int scanelf_dir(const char *path)
955{ 1372{
956 register DIR *dir; 1373 register DIR *dir;
957 register struct dirent *dentry; 1374 register struct dirent *dentry;
958 struct stat st_top, st; 1375 struct stat st_top, st;
959 char buf[_POSIX_PATH_MAX]; 1376 char buf[__PAX_UTILS_PATH_MAX];
960 size_t pathlen = 0, len = 0; 1377 size_t pathlen = 0, len = 0;
1378 int ret = 0;
961 1379
962 /* make sure path exists */ 1380 /* make sure path exists */
963 if (lstat(path, &st_top) == -1) { 1381 if (lstat(path, &st_top) == -1) {
964 if (be_verbose > 2) printf("%s: does not exist\n", path); 1382 if (be_verbose > 2) printf("%s: does not exist\n", path);
965 return; 1383 return 1;
966 } 1384 }
967 1385
968 /* ok, if it isn't a directory, assume we can open it */ 1386 /* ok, if it isn't a directory, assume we can open it */
969 if (!S_ISDIR(st_top.st_mode)) { 1387 if (!S_ISDIR(st_top.st_mode)) {
970 scanelf_file(path); 1388 return scanelf_file(path, &st_top);
971 return;
972 } 1389 }
973 1390
974 /* now scan the dir looking for fun stuff */ 1391 /* now scan the dir looking for fun stuff */
975 if ((dir = opendir(path)) == NULL) { 1392 if ((dir = opendir(path)) == NULL) {
976 warnf("could not opendir %s: %s", path, strerror(errno)); 1393 warnf("could not opendir %s: %s", path, strerror(errno));
977 return; 1394 return 1;
978 } 1395 }
979 if (be_verbose) printf("%s: scanning dir\n", path); 1396 if (be_verbose > 1) printf("%s: scanning dir\n", path);
980 1397
981 pathlen = strlen(path); 1398 pathlen = strlen(path);
982 while ((dentry = readdir(dir))) { 1399 while ((dentry = readdir(dir))) {
983 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1400 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
984 continue; 1401 continue;
986 if (len >= sizeof(buf)) { 1403 if (len >= sizeof(buf)) {
987 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path, 1404 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
988 (unsigned long)len, (unsigned long)sizeof(buf)); 1405 (unsigned long)len, (unsigned long)sizeof(buf));
989 continue; 1406 continue;
990 } 1407 }
991 sprintf(buf, "%s/%s", path, dentry->d_name); 1408 snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name);
992 if (lstat(buf, &st) != -1) { 1409 if (lstat(buf, &st) != -1) {
993 if (S_ISREG(st.st_mode)) 1410 if (S_ISREG(st.st_mode))
994 scanelf_file(buf); 1411 ret = scanelf_file(buf, &st);
995 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1412 else if (dir_recurse && S_ISDIR(st.st_mode)) {
996 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1413 if (dir_crossmount || (st_top.st_dev == st.st_dev))
997 scanelf_dir(buf); 1414 ret = scanelf_dir(buf);
998 } 1415 }
999 } 1416 }
1000 } 1417 }
1001 closedir(dir); 1418 closedir(dir);
1419 return ret;
1002} 1420}
1003 1421
1004static int scanelf_from_file(char *filename) 1422static int scanelf_from_file(const char *filename)
1005{ 1423{
1006 FILE *fp = NULL; 1424 FILE *fp = NULL;
1007 char *p; 1425 char *p;
1008 char path[_POSIX_PATH_MAX]; 1426 char path[__PAX_UTILS_PATH_MAX];
1427 int ret = 0;
1009 1428
1010 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL)) 1429 if (strcmp(filename, "-") == 0)
1011 fp = stdin; 1430 fp = stdin;
1012 else if ((fp = fopen(filename, "r")) == NULL) 1431 else if ((fp = fopen(filename, "r")) == NULL)
1013 return 1; 1432 return 1;
1014 1433
1015 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1434 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1016 if ((p = strchr(path, '\n')) != NULL) 1435 if ((p = strchr(path, '\n')) != NULL)
1017 *p = 0; 1436 *p = 0;
1018 search_path = path; 1437 search_path = path;
1019 scanelf_dir(path); 1438 ret = scanelf_dir(path);
1020 } 1439 }
1021 if (fp != stdin) 1440 if (fp != stdin)
1022 fclose(fp); 1441 fclose(fp);
1023 return 0; 1442 return ret;
1024} 1443}
1025 1444
1026static void load_ld_so_conf() 1445#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1446
1447static int load_ld_cache_config(int i, const char *fname)
1027{ 1448{
1028 FILE *fp = NULL; 1449 FILE *fp = NULL;
1029 char *p; 1450 char *p;
1030 char path[_POSIX_PATH_MAX]; 1451 char path[__PAX_UTILS_PATH_MAX];
1031 int i = 0;
1032 1452
1033 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1453 if (i + 1 == ARRAY_SIZE(ldpaths))
1034 return; 1454 return i;
1035 1455
1456 if ((fp = fopen(fname, "r")) == NULL)
1457 return i;
1458
1036 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1459 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1037 if (*path != '/')
1038 continue;
1039
1040 if ((p = strrchr(path, '\r')) != NULL) 1460 if ((p = strrchr(path, '\r')) != NULL)
1041 *p = 0; 1461 *p = 0;
1042 if ((p = strchr(path, '\n')) != NULL) 1462 if ((p = strchr(path, '\n')) != NULL)
1043 *p = 0; 1463 *p = 0;
1464#ifdef __linux__
1465 /* recursive includes of the same file will make this segfault. */
1466 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1467 glob64_t gl;
1468 size_t x;
1469 char gpath[__PAX_UTILS_PATH_MAX];
1470
1471 memset(gpath, 0, sizeof(gpath));
1472
1473 if (path[8] != '/')
1474 snprintf(gpath, sizeof(gpath), "/etc/%s", &path[8]);
1475 else
1476 strncpy(gpath, &path[8], sizeof(gpath));
1477
1478 if ((glob64(gpath, 0, NULL, &gl)) == 0) {
1479 for (x = 0; x < gl.gl_pathc; ++x) {
1480 /* try to avoid direct loops */
1481 if (strcmp(gl.gl_pathv[x], fname) == 0)
1482 continue;
1483 i = load_ld_cache_config(i, gl.gl_pathv[x]);
1484 if (i + 1 >= ARRAY_SIZE(ldpaths)) {
1485 globfree64(&gl);
1486 return i;
1487 }
1488 }
1489 globfree64 (&gl);
1490 continue;
1491 }
1492 }
1493#endif
1494 if (*path != '/')
1495 continue;
1044 1496
1045 ldpaths[i++] = xstrdup(path); 1497 ldpaths[i++] = xstrdup(path);
1046 1498
1047 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths)) 1499 if (i + 1 == ARRAY_SIZE(ldpaths))
1048 break; 1500 break;
1049 } 1501 }
1050 ldpaths[i] = NULL; 1502 ldpaths[i] = NULL;
1051 1503
1052 fclose(fp); 1504 fclose(fp);
1505 return i;
1053} 1506}
1507
1508#elif defined(__FreeBSD__) || (__DragonFly__)
1509
1510static int load_ld_cache_config(int i, const char *fname)
1511{
1512 FILE *fp = NULL;
1513 char *b = NULL, *p;
1514 struct elfhints_hdr hdr;
1515
1516 if (i + 1 == ARRAY_SIZE(ldpaths))
1517 return i;
1518
1519 if ((fp = fopen(fname, "r")) == NULL)
1520 return i;
1521
1522 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1523 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1524 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1525 {
1526 fclose(fp);
1527 return i;
1528 }
1529
1530 b = xmalloc(hdr.dirlistlen + 1);
1531 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1532 fclose(fp);
1533 free(b);
1534 return i;
1535 }
1536
1537 while ((p = strsep(&b, ":"))) {
1538 if (*p == '\0') continue;
1539 ldpaths[i++] = xstrdup(p);
1540
1541 if (i + 1 == ARRAY_SIZE(ldpaths))
1542 break;
1543 }
1544 ldpaths[i] = NULL;
1545
1546 free(b);
1547 fclose(fp);
1548 return i;
1549}
1550
1551#else
1552#ifdef __ELF__
1553#warning Cache config support not implemented for your target
1554#endif
1555static int load_ld_cache_config(int i, const char *fname)
1556{
1557 memset(ldpaths, 0x00, sizeof(ldpaths));
1558 return 0;
1559}
1560#endif
1054 1561
1055/* scan /etc/ld.so.conf for paths */ 1562/* scan /etc/ld.so.conf for paths */
1056static void scanelf_ldpath() 1563static void scanelf_ldpath(void)
1057{ 1564{
1058 char scan_l, scan_ul, scan_ull; 1565 char scan_l, scan_ul, scan_ull;
1059 int i = 0; 1566 int i = 0;
1060 1567
1061 if (!ldpaths[0]) 1568 if (!ldpaths[0])
1075 if (!scan_ul) scanelf_dir("/usr/lib"); 1582 if (!scan_ul) scanelf_dir("/usr/lib");
1076 if (!scan_ull) scanelf_dir("/usr/local/lib"); 1583 if (!scan_ull) scanelf_dir("/usr/local/lib");
1077} 1584}
1078 1585
1079/* scan env PATH for paths */ 1586/* scan env PATH for paths */
1080static void scanelf_envpath() 1587static void scanelf_envpath(void)
1081{ 1588{
1082 char *path, *p; 1589 char *path, *p;
1083 1590
1084 path = getenv("PATH"); 1591 path = getenv("PATH");
1085 if (!path) 1592 if (!path)
1092 } 1599 }
1093 1600
1094 free(path); 1601 free(path);
1095} 1602}
1096 1603
1097 1604/* usage / invocation handling functions */ /* Free Flags: c d j u w C G H J K P Q U W */
1098/* usage / invocation handling functions */
1099#define PARSE_FLAGS "plRmyxetrnLibSs:gN:TaqvF:f:o:BhV" 1605#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZBhV"
1100#define a_argument required_argument 1606#define a_argument required_argument
1101static struct option const long_opts[] = { 1607static struct option const long_opts[] = {
1102 {"path", no_argument, NULL, 'p'}, 1608 {"path", no_argument, NULL, 'p'},
1103 {"ldpath", no_argument, NULL, 'l'}, 1609 {"ldpath", no_argument, NULL, 'l'},
1104 {"recursive", no_argument, NULL, 'R'}, 1610 {"recursive", no_argument, NULL, 'R'},
1105 {"mount", no_argument, NULL, 'm'}, 1611 {"mount", no_argument, NULL, 'm'},
1106 {"symlink", no_argument, NULL, 'y'}, 1612 {"symlink", no_argument, NULL, 'y'},
1613 {"archives", no_argument, NULL, 'A'},
1614 {"ldcache", no_argument, NULL, 'L'},
1615 {"fix", no_argument, NULL, 'X'},
1616 {"setpax", a_argument, NULL, 'z'},
1107 {"pax", no_argument, NULL, 'x'}, 1617 {"pax", no_argument, NULL, 'x'},
1108 {"header", no_argument, NULL, 'e'}, 1618 {"header", no_argument, NULL, 'e'},
1109 {"textrel", no_argument, NULL, 't'}, 1619 {"textrel", no_argument, NULL, 't'},
1110 {"rpath", no_argument, NULL, 'r'}, 1620 {"rpath", no_argument, NULL, 'r'},
1111 {"needed", no_argument, NULL, 'n'}, 1621 {"needed", no_argument, NULL, 'n'},
1112 {"ldcache", no_argument, NULL, 'L'},
1113 {"interp", no_argument, NULL, 'i'}, 1622 {"interp", no_argument, NULL, 'i'},
1114 {"bind", no_argument, NULL, 'b'}, 1623 {"bind", no_argument, NULL, 'b'},
1115 {"soname", no_argument, NULL, 'S'}, 1624 {"soname", no_argument, NULL, 'S'},
1116 {"symbol", a_argument, NULL, 's'}, 1625 {"symbol", a_argument, NULL, 's'},
1626 {"section", a_argument, NULL, 'k'},
1117 {"lib", a_argument, NULL, 'N'}, 1627 {"lib", a_argument, NULL, 'N'},
1118 {"gmatch", no_argument, NULL, 'g'}, 1628 {"gmatch", no_argument, NULL, 'g'},
1119 {"textrels", no_argument, NULL, 'T'}, 1629 {"textrels", no_argument, NULL, 'T'},
1630 {"etype", a_argument, NULL, 'E'},
1631 {"bits", a_argument, NULL, 'M'},
1632 {"endian", no_argument, NULL, 'D'},
1633 {"osabi", no_argument, NULL, 'I'},
1634 {"eabi", no_argument, NULL, 'Y'},
1635 {"perms", a_argument, NULL, 'O'},
1636 {"size", no_argument, NULL, 'Z'},
1120 {"all", no_argument, NULL, 'a'}, 1637 {"all", no_argument, NULL, 'a'},
1121 {"quiet", no_argument, NULL, 'q'}, 1638 {"quiet", no_argument, NULL, 'q'},
1122 {"verbose", no_argument, NULL, 'v'}, 1639 {"verbose", no_argument, NULL, 'v'},
1123 {"format", a_argument, NULL, 'F'}, 1640 {"format", a_argument, NULL, 'F'},
1124 {"from", a_argument, NULL, 'f'}, 1641 {"from", a_argument, NULL, 'f'},
1132static const char *opts_help[] = { 1649static const char *opts_help[] = {
1133 "Scan all directories in PATH environment", 1650 "Scan all directories in PATH environment",
1134 "Scan all directories in /etc/ld.so.conf", 1651 "Scan all directories in /etc/ld.so.conf",
1135 "Scan directories recursively", 1652 "Scan directories recursively",
1136 "Don't recursively cross mount points", 1653 "Don't recursively cross mount points",
1137 "Don't scan symlinks\n", 1654 "Don't scan symlinks",
1655 "Scan archives (.a files)",
1656 "Utilize ld.so.cache information (use with -r/-n)",
1657 "Try and 'fix' bad things (use with -r/-e)",
1658 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1138 "Print PaX markings", 1659 "Print PaX markings",
1139 "Print GNU_STACK/PT_LOAD markings", 1660 "Print GNU_STACK/PT_LOAD markings",
1140 "Print TEXTREL information", 1661 "Print TEXTREL information",
1141 "Print RPATH information", 1662 "Print RPATH information",
1142 "Print NEEDED information", 1663 "Print NEEDED information",
1143 "Resolve NEEDED information (use with -n)",
1144 "Print INTERP information", 1664 "Print INTERP information",
1145 "Print BIND information", 1665 "Print BIND information",
1146 "Print SONAME information", 1666 "Print SONAME information",
1147 "Find a specified symbol", 1667 "Find a specified symbol",
1668 "Find a specified section",
1148 "Find a specified library", 1669 "Find a specified library",
1149 "Use strncmp to match libraries. (use with -N)", 1670 "Use strncmp to match libraries. (use with -N)",
1150 "Locate cause of TEXTREL", 1671 "Locate cause of TEXTREL",
1672 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1673 "Print only ELF files matching numeric bits",
1674 "Print Endianness",
1675 "Print OSABI",
1676 "Print EABI (EM_ARM Only)",
1677 "Print only ELF files matching octal permissions",
1678 "Print ELF file size",
1151 "Print all scanned info (-x -e -t -r -b)\n", 1679 "Print all scanned info (-x -e -t -r -b)\n",
1152 "Only output 'bad' things", 1680 "Only output 'bad' things",
1153 "Be verbose (can be specified more than once)", 1681 "Be verbose (can be specified more than once)",
1154 "Use specified format for output", 1682 "Use specified format for output",
1155 "Read input stream from a filename", 1683 "Read input stream from a filename",
1163/* display usage and exit */ 1691/* display usage and exit */
1164static void usage(int status) 1692static void usage(int status)
1165{ 1693{
1166 unsigned long i; 1694 unsigned long i;
1167 printf("* Scan ELF binaries for stuff\n\n" 1695 printf("* Scan ELF binaries for stuff\n\n"
1168 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0); 1696 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1169 printf("Options: -[%s]\n", PARSE_FLAGS); 1697 printf("Options: -[%s]\n", PARSE_FLAGS);
1170 for (i = 0; long_opts[i].name; ++i) 1698 for (i = 0; long_opts[i].name; ++i)
1171 if (long_opts[i].has_arg == no_argument) 1699 if (long_opts[i].has_arg == no_argument)
1172 printf(" -%c, --%-13s* %s\n", long_opts[i].val, 1700 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
1173 long_opts[i].name, opts_help[i]); 1701 long_opts[i].name, opts_help[i]);
1174 else 1702 else
1175 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val, 1703 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
1176 long_opts[i].name, opts_help[i]); 1704 long_opts[i].name, opts_help[i]);
1177 1705
1178 if (status != EXIT_SUCCESS) 1706 puts("\nFor more information, see the scanelf(1) manpage");
1179 exit(status);
1180
1181 puts("\nThe format modifiers for the -F option are:");
1182 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1183 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1184 puts(" i INTERP \tb BIND \ts symbol");
1185 puts(" N library \to Type \tT TEXTRELs");
1186 puts(" S SONAME");
1187 puts(" p filename (with search path removed)");
1188 puts(" f filename (short name/basename)");
1189 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1190
1191 exit(status); 1707 exit(status);
1192} 1708}
1193 1709
1194/* parse command line arguments and preform needed actions */ 1710/* parse command line arguments and preform needed actions */
1711#define do_pax_state(option, flag) \
1712 if (islower(option)) { \
1713 flags &= ~PF_##flag; \
1714 flags |= PF_NO##flag; \
1715 } else { \
1716 flags &= ~PF_NO##flag; \
1717 flags |= PF_##flag; \
1718 }
1195static void parseargs(int argc, char *argv[]) 1719static int parseargs(int argc, char *argv[])
1196{ 1720{
1197 int i; 1721 int i;
1198 char *from_file = NULL; 1722 const char *from_file = NULL;
1723 int ret = 0;
1199 1724
1200 opterr = 0; 1725 opterr = 0;
1201 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 1726 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1202 switch (i) { 1727 switch (i) {
1203 1728
1207 VERSION, __FILE__, __DATE__, rcsid, argv0); 1732 VERSION, __FILE__, __DATE__, rcsid, argv0);
1208 exit(EXIT_SUCCESS); 1733 exit(EXIT_SUCCESS);
1209 break; 1734 break;
1210 case 'h': usage(EXIT_SUCCESS); break; 1735 case 'h': usage(EXIT_SUCCESS); break;
1211 case 'f': 1736 case 'f':
1212 if (from_file) err("Don't specify -f twice"); 1737 if (from_file) warn("You prob don't want to specify -f twice");
1213 from_file = xstrdup(optarg); 1738 from_file = optarg;
1739 break;
1740 case 'E':
1741 strncpy(match_etypes, optarg, sizeof(match_etypes));
1742 break;
1743 case 'M':
1744 match_bits = atoi(optarg);
1745 if (match_bits == 0) {
1746 if (strcmp(optarg, "ELFCLASS32") == 0)
1747 match_bits = 32;
1748 if (strcmp(optarg, "ELFCLASS64") == 0)
1749 match_bits = 64;
1750 }
1751 break;
1752 case 'O':
1753 if (sscanf(optarg, "%o", &match_perms) == -1)
1754 match_bits = 0;
1214 break; 1755 break;
1215 case 'o': { 1756 case 'o': {
1216 FILE *fp = NULL;
1217 if ((fp = freopen(optarg, "w", stdout)) == NULL) 1757 if (freopen(optarg, "w", stdout) == NULL)
1218 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 1758 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1219 SET_STDOUT(fp);
1220 break; 1759 break;
1221 } 1760 }
1222 1761 case 'k':
1762 if (find_section) warn("You prob don't want to specify -k twice");
1763 find_section = optarg;
1764 break;
1223 case 's': { 1765 case 's': {
1224 if (find_sym) warn("You prob don't want to specify -s twice"); 1766 if (find_sym) warn("You prob don't want to specify -s twice");
1225 find_sym = optarg; 1767 find_sym = optarg;
1226 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1227 sprintf(versioned_symname, "%s@", find_sym);
1228 break; 1768 break;
1229 } 1769 }
1230 case 'N': { 1770 case 'N': {
1231 if (find_lib) warn("You prob don't want to specify -N twice"); 1771 if (find_lib) warn("You prob don't want to specify -N twice");
1232 find_lib = optarg; 1772 find_lib = optarg;
1236 case 'F': { 1776 case 'F': {
1237 if (out_format) warn("You prob don't want to specify -F twice"); 1777 if (out_format) warn("You prob don't want to specify -F twice");
1238 out_format = optarg; 1778 out_format = optarg;
1239 break; 1779 break;
1240 } 1780 }
1781 case 'z': {
1782 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1783 size_t x;
1241 1784
1242 case 'g': gmatch = 1; /* break; any reason we dont breal; here ? */ 1785 for (x = 0; x < strlen(optarg); x++) {
1786 switch (optarg[x]) {
1787 case 'p':
1788 case 'P':
1789 do_pax_state(optarg[x], PAGEEXEC);
1790 break;
1791 case 's':
1792 case 'S':
1793 do_pax_state(optarg[x], SEGMEXEC);
1794 break;
1795 case 'm':
1796 case 'M':
1797 do_pax_state(optarg[x], MPROTECT);
1798 break;
1799 case 'e':
1800 case 'E':
1801 do_pax_state(optarg[x], EMUTRAMP);
1802 break;
1803 case 'r':
1804 case 'R':
1805 do_pax_state(optarg[x], RANDMMAP);
1806 break;
1807 case 'x':
1808 case 'X':
1809 do_pax_state(optarg[x], RANDEXEC);
1810 break;
1811 default:
1812 break;
1813 }
1814 }
1815 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
1816 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
1817 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
1818 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
1819 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1820 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1821 setpax = flags;
1822 break;
1823 }
1824 case 'Z': show_size = 1; break;
1825 case 'g': g_match = 1; break;
1243 case 'L': printcache = 1; break; 1826 case 'L': use_ldcache = 1; break;
1244 case 'y': scan_symlink = 0; break; 1827 case 'y': scan_symlink = 0; break;
1828 case 'A': scan_archives = 1; break;
1245 case 'B': show_banner = 0; break; 1829 case 'B': show_banner = 0; break;
1246 case 'l': scan_ldpath = 1; break; 1830 case 'l': scan_ldpath = 1; break;
1247 case 'p': scan_envpath = 1; break; 1831 case 'p': scan_envpath = 1; break;
1248 case 'R': dir_recurse = 1; break; 1832 case 'R': dir_recurse = 1; break;
1249 case 'm': dir_crossmount = 0; break; 1833 case 'm': dir_crossmount = 0; break;
1834 case 'X': ++fix_elf; break;
1250 case 'x': show_pax = 1; break; 1835 case 'x': show_pax = 1; break;
1251 case 'e': show_phdr = 1; break; 1836 case 'e': show_phdr = 1; break;
1252 case 't': show_textrel = 1; break; 1837 case 't': show_textrel = 1; break;
1253 case 'r': show_rpath = 1; break; 1838 case 'r': show_rpath = 1; break;
1254 case 'n': show_needed = 1; break; 1839 case 'n': show_needed = 1; break;
1256 case 'b': show_bind = 1; break; 1841 case 'b': show_bind = 1; break;
1257 case 'S': show_soname = 1; break; 1842 case 'S': show_soname = 1; break;
1258 case 'T': show_textrels = 1; break; 1843 case 'T': show_textrels = 1; break;
1259 case 'q': be_quiet = 1; break; 1844 case 'q': be_quiet = 1; break;
1260 case 'v': be_verbose = (be_verbose % 20) + 1; break; 1845 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1261 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break; 1846 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
1262 1847 case 'D': show_endian = 1; break;
1848 case 'I': show_osabi = 1; break;
1849 case 'Y': show_eabi = 1; break;
1263 case ':': 1850 case ':':
1264 err("Option missing parameter\n"); 1851 err("Option '%c' is missing parameter", optopt);
1265 case '?': 1852 case '?':
1266 err("Unknown option\n"); 1853 err("Unknown option '%c' or argument missing", optopt);
1267 default: 1854 default:
1268 err("Unhandled option '%c'", i); 1855 err("Unhandled option '%c'; please report this", i);
1269 }
1270 } 1856 }
1271 1857 }
1858 if (show_textrels && be_verbose) {
1859 if (which("objdump") != NULL)
1860 has_objdump = 1;
1861 }
1272 /* let the format option override all other options */ 1862 /* let the format option override all other options */
1273 if (out_format) { 1863 if (out_format) {
1274 show_pax = show_phdr = show_textrel = show_rpath = \ 1864 show_pax = show_phdr = show_textrel = show_rpath = \
1275 show_needed = show_interp = show_bind = show_soname = \ 1865 show_needed = show_interp = show_bind = show_soname = \
1276 show_textrels = 0; 1866 show_textrels = show_perms = show_endian = show_size = \
1867 show_osabi = show_eabi = 0;
1277 for (i = 0; out_format[i]; ++i) { 1868 for (i = 0; out_format[i]; ++i) {
1278 if (!IS_MODIFIER(out_format[i])) continue; 1869 if (!IS_MODIFIER(out_format[i])) continue;
1279 1870
1280 switch (out_format[++i]) { 1871 switch (out_format[++i]) {
1872 case '+': break;
1281 case '%': break; 1873 case '%': break;
1282 case '#': break; 1874 case '#': break;
1283 case 'F': break; 1875 case 'F': break;
1284 case 'p': break; 1876 case 'p': break;
1285 case 'f': break; 1877 case 'f': break;
1878 case 'k': break;
1286 case 's': break; 1879 case 's': break;
1287 case 'N': break; 1880 case 'N': break;
1288 case 'o': break; 1881 case 'o': break;
1882 case 'a': break;
1883 case 'M': break;
1884 case 'Z': show_size = 1; break;
1885 case 'D': show_endian = 1; break;
1886 case 'I': show_osabi = 1; break;
1887 case 'Y': show_eabi = 1; break;
1888 case 'O': show_perms = 1; break;
1289 case 'x': show_pax = 1; break; 1889 case 'x': show_pax = 1; break;
1290 case 'e': show_phdr = 1; break; 1890 case 'e': show_phdr = 1; break;
1291 case 't': show_textrel = 1; break; 1891 case 't': show_textrel = 1; break;
1292 case 'r': show_rpath = 1; break; 1892 case 'r': show_rpath = 1; break;
1293 case 'n': show_needed = 1; break; 1893 case 'n': show_needed = 1; break;
1294 case 'i': show_interp = 1; break; 1894 case 'i': show_interp = 1; break;
1295 case 'b': show_bind = 1; break; 1895 case 'b': show_bind = 1; break;
1296 case 'S': show_soname = 1; break; 1896 case 'S': show_soname = 1; break;
1297 case 'T': show_textrels = 1; break; 1897 case 'T': show_textrels = 1; break;
1298 default: 1898 default:
1299 err("Invalid format specifier '%c' (byte %i)", 1899 err("Invalid format specifier '%c' (byte %i)",
1300 out_format[i], i+1); 1900 out_format[i], i+1);
1301 } 1901 }
1302 } 1902 }
1303 1903
1304 /* construct our default format */ 1904 /* construct our default format */
1305 } else { 1905 } else {
1306 size_t fmt_len = 30; 1906 size_t fmt_len = 30;
1307 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 1907 out_format = xmalloc(sizeof(char) * fmt_len);
1908 *out_format = '\0';
1308 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 1909 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1309 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len); 1910 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1911 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
1912 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
1913 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
1914 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
1915 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
1310 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len); 1916 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1311 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 1917 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1312 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 1918 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1313 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 1919 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1314 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 1920 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1315 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len); 1921 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1316 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len); 1922 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1317 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len); 1923 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1318 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len); 1924 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1925 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1319 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len); 1926 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1320 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 1927 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1321 } 1928 }
1322 if (be_verbose > 2) printf("Format: %s\n", out_format); 1929 if (be_verbose > 2) printf("Format: %s\n", out_format);
1323 1930
1324 /* now lets actually do the scanning */ 1931 /* now lets actually do the scanning */
1325 if (scan_ldpath || (show_rpath && be_quiet)) 1932 if (scan_ldpath || use_ldcache)
1326 load_ld_so_conf(); 1933 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
1327 if (scan_ldpath) scanelf_ldpath(); 1934 if (scan_ldpath) scanelf_ldpath();
1328 if (scan_envpath) scanelf_envpath(); 1935 if (scan_envpath) scanelf_envpath();
1936 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
1937 from_file = "-";
1329 if (from_file) { 1938 if (from_file) {
1330 scanelf_from_file(from_file); 1939 scanelf_from_file(from_file);
1331 free(from_file);
1332 from_file = *argv; 1940 from_file = *argv;
1333 } 1941 }
1334 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file) 1942 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1335 err("Nothing to scan !?"); 1943 err("Nothing to scan !?");
1336 while (optind < argc) { 1944 while (optind < argc) {
1337 search_path = argv[optind++]; 1945 search_path = argv[optind++];
1338 scanelf_dir(search_path); 1946 ret = scanelf_dir(search_path);
1339 } 1947 }
1340 1948
1341 /* clean up */ 1949 /* clean up */
1342 if (versioned_symname) free(versioned_symname);
1343 for (i = 0; ldpaths[i]; ++i) 1950 for (i = 0; ldpaths[i]; ++i)
1344 free(ldpaths[i]); 1951 free(ldpaths[i]);
1345 1952
1346 if (ldcache != 0) 1953 if (ldcache != 0)
1347 munmap(ldcache, ldcache_size); 1954 munmap(ldcache, ldcache_size);
1348}
1349
1350
1351
1352/* utility funcs */
1353static char *xstrdup(const char *s)
1354{
1355 char *ret = strdup(s);
1356 if (!ret) err("Could not strdup(): %s", strerror(errno));
1357 return ret; 1955 return ret;
1358} 1956}
1359static void *xmalloc(size_t size)
1360{
1361 void *ret = malloc(size);
1362 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1363 return ret;
1364}
1365static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
1366{
1367 size_t new_len;
1368 1957
1369 new_len = strlen(*dst) + strlen(src); 1958static char **get_split_env(const char *envvar)
1370 if (*curr_len <= new_len) {
1371 *curr_len = new_len + (*curr_len / 2);
1372 *dst = realloc(*dst, *curr_len);
1373 if (!*dst)
1374 err("could not realloc() %li bytes", (unsigned long)*curr_len);
1375 }
1376
1377 if (n)
1378 strncat(*dst, src, n);
1379 else
1380 strcat(*dst, src);
1381}
1382static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1383{ 1959{
1384 static char my_app[2]; 1960 const char *delims = " \t\n";
1385 my_app[0] = append; 1961 char **envvals = NULL;
1386 my_app[1] = '\0'; 1962 char *env, *s;
1387 xstrcat(dst, my_app, curr_len); 1963 int nentry;
1388}
1389 1964
1965 if ((env = getenv(envvar)) == NULL)
1966 return NULL;
1390 1967
1968 env = xstrdup(env);
1969 if (env == NULL)
1970 return NULL;
1971
1972 s = strtok(env, delims);
1973 if (s == NULL) {
1974 free(env);
1975 return NULL;
1976 }
1977
1978 nentry = 0;
1979 while (s != NULL) {
1980 ++nentry;
1981 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
1982 envvals[nentry-1] = s;
1983 s = strtok(NULL, delims);
1984 }
1985 envvals[nentry] = NULL;
1986
1987 /* don't want to free(env) as it contains the memory that backs
1988 * the envvals array of strings */
1989 return envvals;
1990}
1991
1992static void parseenv(void)
1993{
1994 qa_textrels = get_split_env("QA_TEXTRELS");
1995 qa_execstack = get_split_env("QA_EXECSTACK");
1996 qa_wx_load = get_split_env("QA_WX_LOAD");
1997}
1998
1999#ifdef __PAX_UTILS_CLEANUP
2000static void cleanup(void)
2001{
2002 free(out_format);
2003 free(qa_textrels);
2004 free(qa_execstack);
2005 free(qa_wx_load);
2006}
2007#endif
1391 2008
1392int main(int argc, char *argv[]) 2009int main(int argc, char *argv[])
1393{ 2010{
2011 int ret;
1394 if (argc < 2) 2012 if (argc < 2)
1395 usage(EXIT_FAILURE); 2013 usage(EXIT_FAILURE);
2014 parseenv();
1396 parseargs(argc, argv); 2015 ret = parseargs(argc, argv);
1397 fclose(stdout); 2016 fclose(stdout);
1398#ifdef __BOUNDS_CHECKING_ON 2017#ifdef __PAX_UTILS_CLEANUP
1399 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()"); 2018 cleanup();
2019 warn("The calls to add/delete heap should be off:\n"
2020 "\t- 1 due to the out_buffer not being freed in scanelf_file()\n"
2021 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
1400#endif 2022#endif
1401 return EXIT_SUCCESS; 2023 return ret;
1402} 2024}
2025
2026/* Match filename against entries in matchlist, return TRUE
2027 * if the file is listed */
2028static int file_matches_list(const char *filename, char **matchlist)
2029{
2030 char **file;
2031 char *match;
2032 char buf[__PAX_UTILS_PATH_MAX];
2033
2034 if (matchlist == NULL)
2035 return 0;
2036
2037 for (file = matchlist; *file != NULL; file++) {
2038 if (search_path) {
2039 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2040 match = buf;
2041 } else {
2042 match = *file;
2043 }
2044 if (fnmatch(match, filename, 0) == 0)
2045 return 1;
2046 }
2047 return 0;
2048}

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