/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.95 Revision 1.188
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 1.95 2005/12/10 06:08:22 vapier Exp $ 4 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.188 2007/08/31 17:45:24 solar 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 1.188 2007/08/31 17:45:24 solar Exp $";
11#include <stdlib.h> 11const char * const argv0 = "scanelf";
12#include <sys/types.h> 12
13#include <libgen.h>
14#include <limits.h>
15#include <string.h>
16#include <errno.h>
17#include <unistd.h>
18#include <sys/stat.h>
19#include <dirent.h>
20#include <getopt.h>
21#include <assert.h>
22#include "paxinc.h" 13#include "paxinc.h"
23 14
24static const char *rcsid = "$Id: scanelf.c,v 1.95 2005/12/10 06:08:22 vapier Exp $";
25#define argv0 "scanelf"
26
27#define IS_MODIFIER(c) (c == '%' || c == '#') 15#define IS_MODIFIER(c) (c == '%' || c == '#' || c == '+')
28
29
30 16
31/* prototypes */ 17/* prototypes */
32static 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);
33static void scanelf_dir(const char *path); 23static int scanelf_dir(const char *path);
34static void scanelf_ldpath(); 24static void scanelf_ldpath(void);
35static void scanelf_envpath(); 25static void scanelf_envpath(void);
36static void usage(int status); 26static void usage(int status);
27static char **get_split_env(const char *envvar);
28static void parseenv(void);
37static void parseargs(int argc, char *argv[]); 29static int parseargs(int argc, char *argv[]);
38static char *xstrdup(const char *s); 30static int rematch(const char *regex, const char *match, int cflags);
39static void *xmalloc(size_t size);
40static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n);
41#define xstrcat(dst,src,curr_len) xstrncat(dst,src,curr_len,0)
42static inline void xchrcat(char **dst, const char append, size_t *curr_len);
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;
52static char show_phdr = 0; 43static char show_phdr = 0;
53static char show_textrel = 0; 44static char show_textrel = 0;
54static char show_rpath = 0; 45static char show_rpath = 0;
55static char show_needed = 0; 46static char show_needed = 0;
56static char show_interp = 0; 47static char show_interp = 0;
57static char show_bind = 0; 48static char show_bind = 0;
58static char show_soname = 0; 49static char show_soname = 0;
59static char show_textrels = 0; 50static char show_textrels = 0;
60static char show_banner = 1; 51static char show_banner = 1;
52static char show_endian = 0;
61static char be_quiet = 0; 53static char be_quiet = 0;
62static char be_verbose = 0; 54static char be_verbose = 0;
63static char be_wewy_wewy_quiet = 0; 55static char be_wewy_wewy_quiet = 0;
56static char be_semi_verbose = 0;
64static char *find_sym = NULL, *versioned_symname = NULL; 57static char *find_sym = NULL, *versioned_symname = NULL;
65static char *find_lib = NULL; 58static char *find_lib = NULL;
59static char *find_section = NULL;
66static char *out_format = NULL; 60static char *out_format = NULL;
67static char *search_path = NULL; 61static char *search_path = NULL;
62static char fix_elf = 0;
68static char gmatch = 0; 63static char g_match = 0;
64static char use_ldcache = 0;
69 65
66static char **qa_textrels = NULL;
67static char **qa_execstack = NULL;
68static char **qa_wx_load = NULL;
69
70int match_bits = 0;
71unsigned int match_perms = 0;
72caddr_t ldcache = 0;
73size_t ldcache_size = 0;
74unsigned long setpax = 0UL;
75
76int has_objdump = 0;
77
78static char *getstr_perms(const char *fname);
79static char *getstr_perms(const char *fname)
80{
81 struct stat st;
82 static char buf[8];
83
84 if ((stat(fname, &st)) == (-1))
85 return (char *) "";
86
87 snprintf(buf, sizeof(buf), "%o", st.st_mode);
88
89 return (char *) buf + 2;
90}
91
92/* find the path to a file by name */
93static char *which(const char *fname)
94{
95 static char fullpath[BUFSIZ];
96 char *path, *p;
97
98 path = getenv("PATH");
99 if (!path)
100 return NULL;
101
102 path = xstrdup(path);
103 while ((p = strrchr(path, ':')) != NULL) {
104 snprintf(fullpath, sizeof(fullpath), "%s/%s", p + 1, fname);
105 *p = 0;
106 if (access(fullpath, R_OK) != (-1)) {
107 free(path);
108 return (char *) fullpath;
109 }
110 }
111 free(path);
112 return NULL;
113}
114
115/* 1 on failure. 0 otherwise */
116static int rematch(const char *regex, const char *match, int cflags)
117{
118 regex_t preg;
119 int ret;
120
121 if ((match == NULL) || (regex == NULL))
122 return EXIT_FAILURE;
123
124
125 if ((ret = regcomp(&preg, regex, cflags))) {
126 char err[256];
127
128 if (regerror(ret, &preg, err, sizeof(err)))
129 fprintf(stderr, "regcomp failed: %s", err);
130 else
131 fprintf(stderr, "regcomp failed");
132
133 return EXIT_FAILURE;
134 }
135 ret = regexec(&preg, match, 0, NULL, 0);
136 regfree(&preg);
137
138 return ret;
139}
70 140
71/* sub-funcs for scanelf_file() */ 141/* sub-funcs for scanelf_file() */
72static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab) 142static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
73{ 143{
74 /* find the best SHT_DYNSYM and SHT_STRTAB sections */ 144 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
93 } \ 163 } \
94 } 164 }
95 GET_SYMTABS(32) 165 GET_SYMTABS(32)
96 GET_SYMTABS(64) 166 GET_SYMTABS(64)
97} 167}
168
98static char *scanelf_file_pax(elfobj *elf, char *found_pax) 169static char *scanelf_file_pax(elfobj *elf, char *found_pax)
99{ 170{
100 static char ret[7]; 171 static char ret[7];
101 unsigned long i, shown; 172 unsigned long i, shown;
102 173
111 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 182 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
112 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 183 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
113 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 184 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
114 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \ 185 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
115 continue; \ 186 continue; \
116 if (be_quiet && (EGET(phdr[i].p_flags) == 10240)) \ 187 if (fix_elf && setpax) { \
188 /* set the paxctl flags */ \
189 ESET(phdr[i].p_flags, setpax); \
190 } \
191 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
117 continue; \ 192 continue; \
118 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \ 193 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
119 *found_pax = 1; \ 194 *found_pax = 1; \
120 ++shown; \ 195 ++shown; \
121 break; \ 196 break; \
122 } \ 197 } \
123 } 198 }
124 SHOW_PAX(32) 199 SHOW_PAX(32)
125 SHOW_PAX(64) 200 SHOW_PAX(64)
201 }
202
203
204 if (fix_elf && setpax) {
205 /* set the chpax settings */
206 if (elf->elf_class == ELFCLASS32) {
207 if (EHDR32(elf->ehdr)->e_type == ET_DYN || EHDR32(elf->ehdr)->e_type == ET_EXEC)
208 ESET(EHDR32(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
209 } else {
210 if (EHDR64(elf->ehdr)->e_type == ET_DYN || EHDR64(elf->ehdr)->e_type == ET_EXEC)
211 ESET(EHDR64(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
212 }
126 } 213 }
127 214
128 /* fall back to EI_PAX if no PT_PAX was found */ 215 /* fall back to EI_PAX if no PT_PAX was found */
129 if (!*ret) { 216 if (!*ret) {
130 static char *paxflags; 217 static char *paxflags;
144 231
145static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load) 232static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
146{ 233{
147 static char ret[12]; 234 static char ret[12];
148 char *found; 235 char *found;
149 unsigned long i, shown;
150 unsigned char multi_stack, multi_relro, multi_load; 236 unsigned long i, shown, multi_stack, multi_relro, multi_load;
237 int max_pt_load;
151 238
152 if (!show_phdr) return NULL; 239 if (!show_phdr) return NULL;
153 240
154 memcpy(ret, "--- --- ---\0", 12); 241 memcpy(ret, "--- --- ---\0", 12);
155 242
156 shown = 0; 243 shown = 0;
157 multi_stack = multi_relro = multi_load = 0; 244 multi_stack = multi_relro = multi_load = 0;
245 max_pt_load = elf_max_pt_load(elf);
158 246
247#define NOTE_GNU_STACK ".note.GNU-stack"
159#define SHOW_PHDR(B) \ 248#define SHOW_PHDR(B) \
160 if (elf->elf_class == ELFCLASS ## B) { \ 249 if (elf->elf_class == ELFCLASS ## B) { \
161 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 250 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
162 Elf ## B ## _Off offset; \ 251 Elf ## B ## _Off offset; \
163 uint32_t flags, check_flags; \ 252 uint32_t flags, check_flags; \
164 if (elf->phdr != NULL) { \ 253 if (elf->phdr != NULL) { \
165 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 254 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
166 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \ 255 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
167 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \ 256 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
257 if (multi_stack++) \
168 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \ 258 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
259 if (file_matches_list(elf->filename, qa_execstack)) \
260 continue; \
169 found = found_phdr; \ 261 found = found_phdr; \
170 offset = 0; \ 262 offset = 0; \
171 check_flags = PF_X; \ 263 check_flags = PF_X; \
172 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \ 264 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
265 if (multi_relro++) \
173 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \ 266 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
174 found = found_relro; \ 267 found = found_relro; \
175 offset = 4; \ 268 offset = 4; \
176 check_flags = PF_X; \ 269 check_flags = PF_X; \
177 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \ 270 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
178 if (multi_load++ > 2) warnf("%s: more than 2 PT_LOAD's !?", elf->filename); \ 271 if (EGET(ehdr->e_type) == ET_DYN || EGET(ehdr->e_type) == ET_EXEC) \
272 if (multi_load++ > max_pt_load) \
273 warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
274 if (file_matches_list(elf->filename, qa_wx_load)) \
275 continue; \
179 found = found_load; \ 276 found = found_load; \
180 offset = 8; \ 277 offset = 8; \
181 check_flags = PF_W|PF_X; \ 278 check_flags = PF_W|PF_X; \
182 } else \ 279 } else \
183 continue; \ 280 continue; \
184 flags = EGET(phdr[i].p_flags); \ 281 flags = EGET(phdr[i].p_flags); \
185 if (be_quiet && ((flags & check_flags) != check_flags)) \ 282 if (be_quiet && ((flags & check_flags) != check_flags)) \
186 continue; \ 283 continue; \
284 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
285 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
286 ret[3] = ret[7] = '!'; \
287 flags = EGET(phdr[i].p_flags); \
288 } \
187 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \ 289 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
188 *found = 1; \ 290 *found = 1; \
189 ++shown; \ 291 ++shown; \
190 } \ 292 } \
191 } else if (elf->shdr != NULL) { \ 293 } else if (elf->shdr != NULL) { \
192 /* no program headers which means this is prob an object file */ \ 294 /* no program headers which means this is prob an object file */ \
193 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \ 295 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
194 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \ 296 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
297 char *str; \
298 if ((void*)strtbl > (void*)elf->data_end) \
299 goto skip_this_shdr##B; \
195 check_flags = SHF_WRITE|SHF_EXECINSTR; \ 300 check_flags = SHF_WRITE|SHF_EXECINSTR; \
196 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \ 301 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
197 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \ 302 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
198 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \ 303 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
199 if (!strcmp((char*)(elf->data + offset), ".note.GNU-stack")) { \ 304 str = elf->data + offset; \
305 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
306 if (!strcmp(str, NOTE_GNU_STACK)) { \
200 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \ 307 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
201 flags = EGET(shdr[i].sh_flags); \ 308 flags = EGET(shdr[i].sh_flags); \
202 if (be_quiet && ((flags & check_flags) != check_flags)) \ 309 if (be_quiet && ((flags & check_flags) != check_flags)) \
203 continue; \ 310 continue; \
204 ++*found_phdr; \ 311 ++*found_phdr; \
208 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \ 315 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
209 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \ 316 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
210 break; \ 317 break; \
211 } \ 318 } \
212 } \ 319 } \
320 skip_this_shdr##B: \
213 if (!multi_stack) { \ 321 if (!multi_stack) { \
322 if (file_matches_list(elf->filename, qa_execstack)) \
323 return NULL; \
214 *found_phdr = 1; \ 324 *found_phdr = 1; \
215 shown = 1; \ 325 shown = 1; \
216 memcpy(ret, "!WX", 3); \ 326 memcpy(ret, "!WX", 3); \
217 } \ 327 } \
218 } \ 328 } \
223 if (be_wewy_wewy_quiet || (be_quiet && !shown)) 333 if (be_wewy_wewy_quiet || (be_quiet && !shown))
224 return NULL; 334 return NULL;
225 else 335 else
226 return ret; 336 return ret;
227} 337}
338
339/*
340 * See if this ELF contains a DT_TEXTREL tag in any of its
341 * PT_DYNAMIC sections.
342 */
228static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 343static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
229{ 344{
230 static const char *ret = "TEXTREL"; 345 static const char *ret = "TEXTREL";
231 unsigned long i; 346 unsigned long i;
232 347
233 if (!show_textrel && !show_textrels) return NULL; 348 if (!show_textrel && !show_textrels) return NULL;
349
350 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
234 351
235 if (elf->phdr) { 352 if (elf->phdr) {
236#define SHOW_TEXTREL(B) \ 353#define SHOW_TEXTREL(B) \
237 if (elf->elf_class == ELFCLASS ## B) { \ 354 if (elf->elf_class == ELFCLASS ## B) { \
238 Elf ## B ## _Dyn *dyn; \ 355 Elf ## B ## _Dyn *dyn; \
239 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 356 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
240 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 357 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
241 Elf ## B ## _Off offset; \ 358 Elf ## B ## _Off offset; \
242 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 359 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
243 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 360 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
244 offset = EGET(phdr[i].p_offset); \ 361 offset = EGET(phdr[i].p_offset); \
245 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 362 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
246 dyn = DYN ## B (elf->data + offset); \ 363 dyn = DYN ## B (elf->data + offset); \
247 while (EGET(dyn->d_tag) != DT_NULL) { \ 364 while (EGET(dyn->d_tag) != DT_NULL) { \
248 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \ 365 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
260 if (be_quiet || be_wewy_wewy_quiet) 377 if (be_quiet || be_wewy_wewy_quiet)
261 return NULL; 378 return NULL;
262 else 379 else
263 return " - "; 380 return " - ";
264} 381}
382
383/*
384 * Scan the .text section to see if there are any relocations in it.
385 * Should rewrite this to check PT_LOAD sections that are marked
386 * Executable rather than the section named '.text'.
387 */
265static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel) 388static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
266{ 389{
267 unsigned long s, r, rmax; 390 unsigned long s, r, rmax;
268 void *symtab_void, *strtab_void, *text_void; 391 void *symtab_void, *strtab_void, *text_void;
269 392
321 if (be_verbose <= 2) continue; \ 444 if (be_verbose <= 2) continue; \
322 } else \ 445 } else \
323 *found_textrels = 1; \ 446 *found_textrels = 1; \
324 /* locate this relocation symbol name */ \ 447 /* locate this relocation symbol name */ \
325 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 448 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
449 if ((void*)sym > (void*)elf->data_end) { \
450 warn("%s: corrupt ELF symbol", elf->filename); \
451 continue; \
452 } \
326 sym_max = ELF ## B ## _R_SYM(r_info); \ 453 sym_max = ELF ## B ## _R_SYM(r_info); \
327 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \ 454 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
328 sym += sym_max; \ 455 sym += sym_max; \
329 else \ 456 else \
330 sym = NULL; \ 457 sym = NULL; \
332 /* show the raw details about this reloc */ \ 459 /* show the raw details about this reloc */ \
333 printf(" %s: ", elf->base_filename); \ 460 printf(" %s: ", elf->base_filename); \
334 if (sym && sym->st_name) \ 461 if (sym && sym->st_name) \
335 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \ 462 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \
336 else \ 463 else \
337 printf("(memory/fake?)"); \ 464 printf("(memory/data?)"); \
338 printf(" [0x%lX]", (unsigned long)r_offset); \ 465 printf(" [0x%lX]", (unsigned long)r_offset); \
339 /* now try to find the closest symbol that this rel is probably in */ \ 466 /* now try to find the closest symbol that this rel is probably in */ \
340 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 467 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
341 func = NULL; \ 468 func = NULL; \
342 offset_tmp = 0; \ 469 offset_tmp = 0; \
346 offset_tmp = EGET(sym->st_value); \ 473 offset_tmp = EGET(sym->st_value); \
347 } \ 474 } \
348 ++sym; \ 475 ++sym; \
349 } \ 476 } \
350 printf(" in "); \ 477 printf(" in "); \
351 if (func && func->st_name) \ 478 if (func && func->st_name) { \
352 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \ 479 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
480 if (r_offset > EGET(func->st_size)) \
481 printf("(optimized out: previous %s)", func_name); \
353 else \ 482 else \
354 printf("(NULL: fake?)"); \ 483 printf("%s", func_name); \
484 } else \
485 printf("(optimized out)"); \
355 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \ 486 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
487 if (be_verbose && has_objdump) { \
488 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
489 char *sysbuf; \
490 size_t syslen; \
491 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"; \
492 syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
493 sysbuf = xmalloc(syslen); \
494 if (end_addr < r_offset) \
495 /* not uncommon when things are optimized out */ \
496 end_addr = r_offset + 0x100; \
497 snprintf(sysbuf, syslen, sysfmt, \
498 (unsigned long)offset_tmp, \
499 (unsigned long)end_addr, \
500 elf->filename, \
501 (unsigned long)r_offset); \
502 fflush(stdout); \
503 system(sysbuf); \
504 fflush(stdout); \
505 free(sysbuf); \
506 } \
356 } \ 507 } \
357 } } 508 } }
358 SHOW_TEXTRELS(32) 509 SHOW_TEXTRELS(32)
359 SHOW_TEXTRELS(64) 510 SHOW_TEXTRELS(64)
360 } 511 }
362 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename); 513 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
363 514
364 return NULL; 515 return NULL;
365} 516}
366 517
367static void rpath_security_checks(elfobj *, char *); 518static void rpath_security_checks(elfobj *, char *, const char *);
368static void rpath_security_checks(elfobj *elf, char *item) { 519static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
520{
369 struct stat st; 521 struct stat st;
370 switch (*item) { 522 switch (*item) {
371 case '/': break; 523 case '/': break;
372 case '.': 524 case '.':
373 warnf("Security problem with relative RPATH '%s' in %s", item, elf->filename); 525 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
374 break; 526 break;
527 case ':':
375 case '\0': 528 case '\0':
376 warnf("Security problem NULL RPATH in %s", elf->filename); 529 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
377 break; 530 break;
378 case '$': 531 case '$':
379 if (fstat(elf->fd, &st) != -1) 532 if (fstat(elf->fd, &st) != -1)
380 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID)) 533 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
381 warnf("Security problem with RPATH='%s' in %s with mode set of %o", 534 warnf("Security problem with %s='%s' in %s with mode set of %o",
382 item, elf->filename, st.st_mode & 07777); 535 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
383 break; 536 break;
384 default: 537 default:
385 warnf("Maybe? sec problem with RPATH='%s' in %s", item, elf->filename); 538 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
386 break; 539 break;
387 } 540 }
388} 541}
389static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len) 542static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
390{ 543{
407 Elf ## B ## _Off offset; \ 560 Elf ## B ## _Off offset; \
408 Elf ## B ## _Xword word; \ 561 Elf ## B ## _Xword word; \
409 /* Scan all the program headers */ \ 562 /* Scan all the program headers */ \
410 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 563 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
411 /* Just scan dynamic headers */ \ 564 /* Just scan dynamic headers */ \
412 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 565 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
413 offset = EGET(phdr[i].p_offset); \ 566 offset = EGET(phdr[i].p_offset); \
414 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 567 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
415 /* Just scan dynamic RPATH/RUNPATH headers */ \ 568 /* Just scan dynamic RPATH/RUNPATH headers */ \
416 dyn = DYN ## B (elf->data + offset); \ 569 dyn = DYN ## B (elf->data + offset); \
417 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \ 570 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
426 /* Verify the memory is somewhat sane */ \ 579 /* Verify the memory is somewhat sane */ \
427 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 580 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
428 if (offset < (Elf ## B ## _Off)elf->len) { \ 581 if (offset < (Elf ## B ## _Off)elf->len) { \
429 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \ 582 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
430 *r = (char*)(elf->data + offset); \ 583 *r = (char*)(elf->data + offset); \
584 /* cache the length in case we need to nuke this section later on */ \
585 if (fix_elf) \
586 offset = strlen(*r); \
431 /* If quiet, don't output paths in ld.so.conf */ \ 587 /* If quiet, don't output paths in ld.so.conf */ \
432 if (be_quiet) { \ 588 if (be_quiet) { \
433 size_t len; \ 589 size_t len; \
434 char *start, *end; \ 590 char *start, *end; \
435 /* note that we only 'chop' off leading known paths. */ \ 591 /* note that we only 'chop' off leading known paths. */ \
436 /* since *r is read-only memory, we can only move the ptr forward. */ \ 592 /* since *r is read-only memory, we can only move the ptr forward. */ \
437 start = *r; \ 593 start = *r; \
438 /* scan each path in : delimited list */ \ 594 /* scan each path in : delimited list */ \
439 while (start) { \ 595 while (start) { \
440 rpath_security_checks(elf, start); \ 596 rpath_security_checks(elf, start, get_elfdtype(word)); \
441 end = strchr(start, ':'); \ 597 end = strchr(start, ':'); \
442 len = (end ? abs(end - start) : strlen(start)); \ 598 len = (end ? abs(end - start) : strlen(start)); \
599 if (use_ldcache) \
443 for (s = 0; ldpaths[s]; ++s) { \ 600 for (s = 0; ldpaths[s]; ++s) \
444 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \ 601 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
445 *r = (end ? end + 1 : NULL); \ 602 *r = end; \
603 /* corner case ... if RPATH reads "/usr/lib:", we want \
604 * to show ':' rather than '' */ \
605 if (end && end[1] != '\0') \
606 (*r)++; \
446 break; \ 607 break; \
447 } \ 608 } \
448 } \
449 if (!*r || !ldpaths[s] || !end) \ 609 if (!*r || !end) \
450 start = NULL; \ 610 break; \
451 else \ 611 else \
452 start = start + len + 1; \ 612 start = start + len + 1; \
453 } \ 613 } \
454 } \ 614 } \
615 if (*r) { \
616 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
617 /* just nuke it */ \
618 nuke_it##B: \
619 memset(*r, 0x00, offset); \
620 *r = NULL; \
621 ESET(dyn->d_tag, DT_DEBUG); \
622 ESET(dyn->d_un.d_ptr, 0); \
623 } else if (fix_elf) { \
624 /* try to clean "bad" paths */ \
625 size_t len, tmpdir_len; \
626 char *start, *end; \
627 const char *tmpdir; \
628 start = *r; \
629 tmpdir = (getenv("TMPDIR") ? : "."); \
630 tmpdir_len = strlen(tmpdir); \
631 while (1) { \
632 end = strchr(start, ':'); \
633 if (start == end) { \
634 eat_this_path##B: \
635 len = strlen(end); \
636 memmove(start, end+1, len); \
637 start[len-1] = '\0'; \
638 end = start - 1; \
639 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
640 if (!end) { \
641 if (start == *r) \
642 goto nuke_it##B; \
643 *--start = '\0'; \
644 } else \
645 goto eat_this_path##B; \
646 } \
647 if (!end) \
648 break; \
649 start = end + 1; \
650 } \
651 if (**r == '\0') \
652 goto nuke_it##B; \
653 } \
654 if (*r) \
455 if (*r) *found_rpath = 1; \ 655 *found_rpath = 1; \
656 } \
456 } \ 657 } \
457 ++dyn; \ 658 ++dyn; \
458 } \ 659 } \
459 } } 660 } }
460 SHOW_RPATH(32) 661 SHOW_RPATH(32)
477 } else if (rpath || runpath) 678 } else if (rpath || runpath)
478 xstrcat(ret, (runpath ? runpath : rpath), ret_len); 679 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
479 else if (!be_quiet) 680 else if (!be_quiet)
480 xstrcat(ret, " - ", ret_len); 681 xstrcat(ret, " - ", ret_len);
481} 682}
683
684#define LDSO_CACHE_MAGIC "ld.so-"
685#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
686#define LDSO_CACHE_VER "1.7.0"
687#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
688#define FLAG_ANY -1
689#define FLAG_TYPE_MASK 0x00ff
690#define FLAG_LIBC4 0x0000
691#define FLAG_ELF 0x0001
692#define FLAG_ELF_LIBC5 0x0002
693#define FLAG_ELF_LIBC6 0x0003
694#define FLAG_REQUIRED_MASK 0xff00
695#define FLAG_SPARC_LIB64 0x0100
696#define FLAG_IA64_LIB64 0x0200
697#define FLAG_X8664_LIB64 0x0300
698#define FLAG_S390_LIB64 0x0400
699#define FLAG_POWERPC_LIB64 0x0500
700#define FLAG_MIPS64_LIBN32 0x0600
701#define FLAG_MIPS64_LIBN64 0x0700
702
703static char *lookup_cache_lib(elfobj *, char *);
704
705#if defined(__GLIBC__) || defined(__UCLIBC__)
706
707static char *lookup_cache_lib(elfobj *elf, char *fname)
708{
709 int fd = 0;
710 char *strs;
711 static char buf[__PAX_UTILS_PATH_MAX] = "";
712 const char *cachefile = "/etc/ld.so.cache";
713 struct stat st;
714
715 typedef struct {
716 char magic[LDSO_CACHE_MAGIC_LEN];
717 char version[LDSO_CACHE_VER_LEN];
718 int nlibs;
719 } header_t;
720 header_t *header;
721
722 typedef struct {
723 int flags;
724 int sooffset;
725 int liboffset;
726 } libentry_t;
727 libentry_t *libent;
728
729 if (fname == NULL)
730 return NULL;
731
732 if (ldcache == 0) {
733 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1)
734 return NULL;
735
736 /* cache these values so we only map/unmap the cache file once */
737 ldcache_size = st.st_size;
738 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
739
740 close(fd);
741
742 if (ldcache == (caddr_t)-1) {
743 ldcache = 0;
744 return NULL;
745 }
746
747 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
748 return NULL;
749 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
750 return NULL;
751 }
752
753 header = (header_t *) ldcache;
754 libent = (libentry_t *) (ldcache + sizeof(header_t));
755 strs = (char *) &libent[header->nlibs];
756
757 for (fd = 0; fd < header->nlibs; fd++) {
758 /* this should be more fine grained, but for now we assume that
759 * diff arches will not be cached together. and we ignore the
760 * the different multilib mips cases. */
761 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
762 continue;
763 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
764 continue;
765
766 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
767 continue;
768 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
769 }
770 return buf;
771}
772#elif defined(__NetBSD__)
773static char *lookup_cache_lib(elfobj *elf, char *fname)
774{
775 static char buf[__PAX_UTILS_PATH_MAX] = "";
776 static struct stat st;
777
778 char **ldpath;
779 for (ldpath = ldpaths; *ldpath != NULL; ldpath++) {
780 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", *ldpath, fname) >= sizeof(buf))
781 continue; /* if the pathname is too long, or something went wrong, ignore */
782
783 if (stat(buf, &st) != 0)
784 continue; /* if the lib doesn't exist in *ldpath, look further */
785
786 /* NetBSD doesn't actually do sanity checks, it just loads the file
787 * and if that doesn't work, continues looking in other directories.
788 * This cannot easily be safely emulated, unfortunately. For now,
789 * just assume that if it exists, it's a valid library. */
790
791 return buf;
792 }
793
794 /* not found in any path */
795 return NULL;
796}
797#else
798#warning Cache support not implemented for your target
799static char *lookup_cache_lib(elfobj *elf, char *fname)
800{
801 return NULL;
802}
803#endif
804
482static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len) 805static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
483{ 806{
484 unsigned long i; 807 unsigned long i;
485 char *needed; 808 char *needed;
486 void *strtbl_void; 809 void *strtbl_void;
810 char *p;
487 811
488 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL; 812 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
489 813
490 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 814 strtbl_void = elf_findsecbyname(elf, ".dynstr");
491 815
496 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 820 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
497 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 821 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
498 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 822 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
499 Elf ## B ## _Off offset; \ 823 Elf ## B ## _Off offset; \
500 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 824 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
501 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 825 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
502 offset = EGET(phdr[i].p_offset); \ 826 offset = EGET(phdr[i].p_offset); \
503 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 827 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
504 dyn = DYN ## B (elf->data + offset); \ 828 dyn = DYN ## B (elf->data + offset); \
505 while (EGET(dyn->d_tag) != DT_NULL) { \ 829 while (EGET(dyn->d_tag) != DT_NULL) { \
506 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 830 if (EGET(dyn->d_tag) == DT_NEEDED) { \
511 } \ 835 } \
512 needed = (char*)(elf->data + offset); \ 836 needed = (char*)(elf->data + offset); \
513 if (op == 0) { \ 837 if (op == 0) { \
514 if (!be_wewy_wewy_quiet) { \ 838 if (!be_wewy_wewy_quiet) { \
515 if (*found_needed) xchrcat(ret, ',', ret_len); \ 839 if (*found_needed) xchrcat(ret, ',', ret_len); \
840 if (use_ldcache) \
841 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
842 needed = p; \
516 xstrcat(ret, needed, ret_len); \ 843 xstrcat(ret, needed, ret_len); \
517 } \ 844 } \
518 *found_needed = 1; \ 845 *found_needed = 1; \
519 } else { \ 846 } else { \
520 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \ 847 if (!strncmp(find_lib, needed, strlen( !g_match ? needed : find_lib))) { \
521 *found_lib = 1; \ 848 *found_lib = 1; \
522 return (be_wewy_wewy_quiet ? NULL : needed); \ 849 return (be_wewy_wewy_quiet ? NULL : needed); \
523 } \ 850 } \
524 } \ 851 } \
525 } \ 852 } \
556} 883}
557static char *scanelf_file_bind(elfobj *elf, char *found_bind) 884static char *scanelf_file_bind(elfobj *elf, char *found_bind)
558{ 885{
559 unsigned long i; 886 unsigned long i;
560 struct stat s; 887 struct stat s;
888 char dynamic = 0;
561 889
562 if (!show_bind) return NULL; 890 if (!show_bind) return NULL;
563 if (!elf->phdr) return NULL; 891 if (!elf->phdr) return NULL;
564 892
565#define SHOW_BIND(B) \ 893#define SHOW_BIND(B) \
567 Elf ## B ## _Dyn *dyn; \ 895 Elf ## B ## _Dyn *dyn; \
568 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 896 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
569 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 897 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
570 Elf ## B ## _Off offset; \ 898 Elf ## B ## _Off offset; \
571 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 899 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
572 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 900 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
901 dynamic = 1; \
573 offset = EGET(phdr[i].p_offset); \ 902 offset = EGET(phdr[i].p_offset); \
574 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 903 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
575 dyn = DYN ## B (elf->data + offset); \ 904 dyn = DYN ## B (elf->data + offset); \
576 while (EGET(dyn->d_tag) != DT_NULL) { \ 905 while (EGET(dyn->d_tag) != DT_NULL) { \
577 if (EGET(dyn->d_tag) == DT_BIND_NOW || \ 906 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
588 SHOW_BIND(32) 917 SHOW_BIND(32)
589 SHOW_BIND(64) 918 SHOW_BIND(64)
590 919
591 if (be_wewy_wewy_quiet) return NULL; 920 if (be_wewy_wewy_quiet) return NULL;
592 921
922 /* don't output anything if quiet mode and the ELF is static or not setuid */
593 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) { 923 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
594 return NULL; 924 return NULL;
595 } else { 925 } else {
596 *found_bind = 1; 926 *found_bind = 1;
597 return (char *) "LAZY"; 927 return (char *) (dynamic ? "LAZY" : "STATIC");
598 } 928 }
599} 929}
600static char *scanelf_file_soname(elfobj *elf, char *found_soname) 930static char *scanelf_file_soname(elfobj *elf, char *found_soname)
601{ 931{
602 unsigned long i; 932 unsigned long i;
614 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 944 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
615 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 945 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
616 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 946 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
617 Elf ## B ## _Off offset; \ 947 Elf ## B ## _Off offset; \
618 /* only look for soname in shared objects */ \ 948 /* only look for soname in shared objects */ \
619 if (ehdr->e_type != ET_DYN) \ 949 if (EGET(ehdr->e_type) != ET_DYN) \
620 return NULL; \ 950 return NULL; \
621 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 951 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
622 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 952 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
623 offset = EGET(phdr[i].p_offset); \ 953 offset = EGET(phdr[i].p_offset); \
624 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 954 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
625 dyn = DYN ## B (elf->data + offset); \ 955 dyn = DYN ## B (elf->data + offset); \
626 while (EGET(dyn->d_tag) != DT_NULL) { \ 956 while (EGET(dyn->d_tag) != DT_NULL) { \
627 if (EGET(dyn->d_tag) == DT_SONAME) { \ 957 if (EGET(dyn->d_tag) == DT_SONAME) { \
641 SHOW_SONAME(64) 971 SHOW_SONAME(64)
642 } 972 }
643 973
644 return NULL; 974 return NULL;
645} 975}
976
646static char *scanelf_file_sym(elfobj *elf, char *found_sym) 977static char *scanelf_file_sym(elfobj *elf, char *found_sym)
647{ 978{
648 unsigned long i; 979 unsigned long i;
649 char *ret; 980 char *ret;
650 void *symtab_void, *strtab_void; 981 void *symtab_void, *strtab_void;
658#define FIND_SYM(B) \ 989#define FIND_SYM(B) \
659 if (elf->elf_class == ELFCLASS ## B) { \ 990 if (elf->elf_class == ELFCLASS ## B) { \
660 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 991 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
661 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 992 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
662 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 993 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
663 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 994 unsigned long cnt = EGET(symtab->sh_entsize); \
664 char *symname; \ 995 char *symname; \
996 if (cnt) \
997 cnt = EGET(symtab->sh_size) / cnt; \
665 for (i = 0; i < cnt; ++i) { \ 998 for (i = 0; i < cnt; ++i) { \
666 if (sym->st_name) { \ 999 if (sym->st_name) { \
1000 /* make sure the symbol name is in acceptable memory range */ \
667 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 1001 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
668 if (*find_sym == '*') { \ 1002 if ((void*)symname > (void*)elf->data_end) { \
1003 warnf("%s: corrupt ELF symbols", elf->filename); \
1004 ++sym; \
1005 continue; \
1006 } \
1007 /* debug display ... show all symbols and some extra info */ \
1008 if (g_match ? rematch(ret, symname, REG_EXTENDED) == 0 : *ret == '*') { \
669 printf("%s(%s) %5lX %15s %s\n", \ 1009 printf("%s(%s) %5lX %15s %s %s\n", \
670 ((*found_sym == 0) ? "\n\t" : "\t"), \ 1010 ((*found_sym == 0) ? "\n\t" : "\t"), \
671 elf->base_filename, \ 1011 elf->base_filename, \
672 (unsigned long)sym->st_size, \ 1012 (unsigned long)sym->st_size, \
673 get_elfstttype(sym->st_info), \ 1013 get_elfstttype(sym->st_info), \
674 symname); \ 1014 sym->st_shndx == SHN_UNDEF ? "U" : "D", symname); \
675 *found_sym = 1; \ 1015 *found_sym = 1; \
676 } else { \ 1016 } else { \
1017 /* allow the user to specify a comma delimited list of symbols to search for */ \
677 char *this_sym, *next_sym; \ 1018 char *this_sym, *this_sym_ver, *next_sym; \
1019 this_sym = ret; \
678 this_sym = find_sym; \ 1020 this_sym_ver = versioned_symname; \
679 do { \ 1021 do { \
680 next_sym = strchr(this_sym, ','); \ 1022 next_sym = strchr(this_sym, ','); \
681 if (next_sym == NULL) \ 1023 if (next_sym == NULL) \
682 next_sym = this_sym + strlen(this_sym); \ 1024 next_sym = this_sym + strlen(this_sym); \
1025 /* do we want a defined symbol ? */ \
1026 if (*this_sym == '+') { \
1027 if (sym->st_shndx == SHN_UNDEF) \
1028 goto skip_this_sym##B; \
1029 ++this_sym; \
1030 ++this_sym_ver; \
1031 /* do we want an undefined symbol ? */ \
1032 } else if (*this_sym == '-') { \
1033 if (sym->st_shndx != SHN_UNDEF) \
1034 goto skip_this_sym##B; \
1035 ++this_sym; \
1036 ++this_sym_ver; \
1037 } \
1038 /* ok, lets compare the name now */ \
683 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \ 1039 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
684 (strcmp(symname, versioned_symname) == 0)) { \ 1040 (strncmp(this_sym_ver, symname, strlen(this_sym_ver)) == 0)) { \
1041 if (be_semi_verbose) { \
1042 char buf[126]; \
1043 snprintf(buf, sizeof(buf), "%lX %s %s", \
1044 (unsigned long)sym->st_size, get_elfstttype(sym->st_info), this_sym); \
1045 ret = buf; \
1046 } else \
685 ret = this_sym; \ 1047 ret = this_sym; \
686 (*found_sym)++; \ 1048 (*found_sym)++; \
687 goto break_out; \ 1049 goto break_out; \
688 } \ 1050 } \
689 this_sym = next_sym + 1; \ 1051 skip_this_sym##B: this_sym = next_sym + 1; \
690 } while (*next_sym != '\0'); \ 1052 } while (*next_sym != '\0'); \
691 } \ 1053 } \
692 } \ 1054 } \
693 ++sym; \ 1055 ++sym; \
694 } } 1056 } }
704 if (be_quiet) 1066 if (be_quiet)
705 return NULL; 1067 return NULL;
706 else 1068 else
707 return (char *)" - "; 1069 return (char *)" - ";
708} 1070}
1071
1072
1073static char *scanelf_file_sections(elfobj *elf, char *found_section)
1074{
1075 if (!find_section)
1076 return NULL;
1077
1078#define FIND_SECTION(B) \
1079 if (elf->elf_class == ELFCLASS ## B) { \
1080 int invert; \
1081 Elf ## B ## _Shdr *section; \
1082 invert = (*find_section == '!' ? 1 : 0); \
1083 section = SHDR ## B (elf_findsecbyname(elf, find_section+invert)); \
1084 if ((section == NULL && invert) || (section != NULL && !invert)) \
1085 *found_section = 1; \
1086 }
1087 FIND_SECTION(32)
1088 FIND_SECTION(64)
1089
1090 if (be_wewy_wewy_quiet)
1091 return NULL;
1092
1093 if (*found_section)
1094 return find_section;
1095
1096 if (be_quiet)
1097 return NULL;
1098 else
1099 return (char *)" - ";
1100}
1101
709/* scan an elf file and show all the fun stuff */ 1102/* scan an elf file and show all the fun stuff */
710#define prints(str) write(fileno(stdout), str, strlen(str)) 1103#define prints(str) write(fileno(stdout), str, strlen(str))
711static void scanelf_file(const char *filename) 1104static int scanelf_elfobj(elfobj *elf)
712{ 1105{
713 unsigned long i; 1106 unsigned long i;
714 char found_pax, found_phdr, found_relro, found_load, found_textrel, 1107 char found_pax, found_phdr, found_relro, found_load, found_textrel,
715 found_rpath, found_needed, found_interp, found_bind, found_soname, 1108 found_rpath, found_needed, found_interp, found_bind, found_soname,
716 found_sym, found_lib, found_file, found_textrels; 1109 found_sym, found_lib, found_file, found_textrels, found_section;
717 elfobj *elf;
718 struct stat st;
719 static char *out_buffer = NULL; 1110 static char *out_buffer = NULL;
720 static size_t out_len; 1111 static size_t out_len;
721 1112
722 /* make sure 'filename' exists */
723 if (lstat(filename, &st) == -1) {
724 if (be_verbose > 2) printf("%s: does not exist\n", filename);
725 return;
726 }
727 /* always handle regular files and handle symlinked files if no -y */
728 if (S_ISLNK(st.st_mode)) {
729 if (!scan_symlink) return;
730 stat(filename, &st);
731 }
732 if (!S_ISREG(st.st_mode)) {
733 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
734 return;
735 }
736
737 found_pax = found_phdr = found_relro = found_load = found_textrel = \ 1113 found_pax = found_phdr = found_relro = found_load = found_textrel = \
738 found_rpath = found_needed = found_interp = found_bind = found_soname = \ 1114 found_rpath = found_needed = found_interp = found_bind = found_soname = \
739 found_sym = found_lib = found_file = found_textrels = 0; 1115 found_sym = found_lib = found_file = found_textrels = found_section = 0;
740 1116
741 /* verify this is real ELF */
742 if ((elf = readelf(filename)) == NULL) {
743 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
744 return;
745 }
746
747 if (be_verbose > 1) 1117 if (be_verbose > 2)
748 printf("%s: scanning file {%s,%s}\n", filename, 1118 printf("%s: scanning file {%s,%s}\n", elf->filename,
749 get_elfeitype(EI_CLASS, elf->elf_class), 1119 get_elfeitype(EI_CLASS, elf->elf_class),
750 get_elfeitype(EI_DATA, elf->data[EI_DATA])); 1120 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
751 else if (be_verbose) 1121 else if (be_verbose > 1)
752 printf("%s: scanning file\n", filename); 1122 printf("%s: scanning file\n", elf->filename);
753 1123
754 /* init output buffer */ 1124 /* init output buffer */
755 if (!out_buffer) { 1125 if (!out_buffer) {
756 out_len = sizeof(char) * 80; 1126 out_len = sizeof(char) * 80;
757 out_buffer = (char*)xmalloc(out_len); 1127 out_buffer = xmalloc(out_len);
758 } 1128 }
759 *out_buffer = '\0'; 1129 *out_buffer = '\0';
760 1130
761 /* show the header */ 1131 /* show the header */
762 if (!be_quiet && show_banner) { 1132 if (!be_quiet && show_banner) {
763 for (i = 0; out_format[i]; ++i) { 1133 for (i = 0; out_format[i]; ++i) {
764 if (!IS_MODIFIER(out_format[i])) continue; 1134 if (!IS_MODIFIER(out_format[i])) continue;
765 1135
766 switch (out_format[++i]) { 1136 switch (out_format[++i]) {
1137 case '+': break;
767 case '%': break; 1138 case '%': break;
768 case '#': break; 1139 case '#': break;
769 case 'F': 1140 case 'F':
770 case 'p': 1141 case 'p':
771 case 'f': prints("FILE "); found_file = 1; break; 1142 case 'f': prints("FILE "); found_file = 1; break;
772 case 'o': prints(" TYPE "); break; 1143 case 'o': prints(" TYPE "); break;
773 case 'x': prints(" PAX "); break; 1144 case 'x': prints(" PAX "); break;
774 case 'e': prints("STK/REL/PTL "); break; 1145 case 'e': prints("STK/REL/PTL "); break;
775 case 't': prints("TEXTREL "); break; 1146 case 't': prints("TEXTREL "); break;
776 case 'r': prints("RPATH "); break; 1147 case 'r': prints("RPATH "); break;
1148 case 'M': prints("CLASS "); break;
777 case 'n': prints("NEEDED "); break; 1149 case 'n': prints("NEEDED "); break;
778 case 'i': prints("INTERP "); break; 1150 case 'i': prints("INTERP "); break;
779 case 'b': prints("BIND "); break; 1151 case 'b': prints("BIND "); break;
780 case 'S': prints("SONAME "); break; 1152 case 'S': prints("SONAME "); break;
781 case 's': prints("SYM "); break; 1153 case 's': prints("SYM "); break;
782 case 'N': prints("LIB "); break; 1154 case 'N': prints("LIB "); break;
783 case 'T': prints("TEXTRELS "); break; 1155 case 'T': prints("TEXTRELS "); break;
1156 case 'k': prints("SECTION "); break;
1157 case 'a': prints("ARCH "); break;
1158 case 'O': prints("PERM "); break;
1159 case 'D': prints("ENDIAN "); break;
784 default: warnf("'%c' has no title ?", out_format[i]); 1160 default: warnf("'%c' has no title ?", out_format[i]);
785 } 1161 }
786 } 1162 }
787 if (!found_file) prints("FILE "); 1163 if (!found_file) prints("FILE ");
788 prints("\n"); 1164 prints("\n");
793 /* dump all the good stuff */ 1169 /* dump all the good stuff */
794 for (i = 0; out_format[i]; ++i) { 1170 for (i = 0; out_format[i]; ++i) {
795 const char *out; 1171 const char *out;
796 const char *tmp; 1172 const char *tmp;
797 1173
798 /* make sure we trim leading spaces in quiet mode */
799 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
800 *out_buffer = '\0';
801
802 if (!IS_MODIFIER(out_format[i])) { 1174 if (!IS_MODIFIER(out_format[i])) {
803 xchrcat(&out_buffer, out_format[i], &out_len); 1175 xchrcat(&out_buffer, out_format[i], &out_len);
804 continue; 1176 continue;
805 } 1177 }
806 1178
807 out = NULL; 1179 out = NULL;
808 be_wewy_wewy_quiet = (out_format[i] == '#'); 1180 be_wewy_wewy_quiet = (out_format[i] == '#');
1181 be_semi_verbose = (out_format[i] == '+');
809 switch (out_format[++i]) { 1182 switch (out_format[++i]) {
1183 case '+':
810 case '%': 1184 case '%':
811 case '#': 1185 case '#':
812 xchrcat(&out_buffer, out_format[i], &out_len); break; 1186 xchrcat(&out_buffer, out_format[i], &out_len); break;
813 case 'F': 1187 case 'F':
814 found_file = 1; 1188 found_file = 1;
815 if (be_wewy_wewy_quiet) break; 1189 if (be_wewy_wewy_quiet) break;
816 xstrcat(&out_buffer, filename, &out_len); 1190 xstrcat(&out_buffer, elf->filename, &out_len);
817 break; 1191 break;
818 case 'p': 1192 case 'p':
819 found_file = 1; 1193 found_file = 1;
820 if (be_wewy_wewy_quiet) break; 1194 if (be_wewy_wewy_quiet) break;
821 tmp = filename; 1195 tmp = elf->filename;
822 if (search_path) { 1196 if (search_path) {
823 ssize_t len_search = strlen(search_path); 1197 ssize_t len_search = strlen(search_path);
824 ssize_t len_file = strlen(filename); 1198 ssize_t len_file = strlen(elf->filename);
825 if (!strncmp(filename, search_path, len_search) && \ 1199 if (!strncmp(elf->filename, search_path, len_search) && \
826 len_file > len_search) 1200 len_file > len_search)
827 tmp += len_search; 1201 tmp += len_search;
828 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++; 1202 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
829 } 1203 }
830 xstrcat(&out_buffer, tmp, &out_len); 1204 xstrcat(&out_buffer, tmp, &out_len);
831 break; 1205 break;
832 case 'f': 1206 case 'f':
833 found_file = 1; 1207 found_file = 1;
834 if (be_wewy_wewy_quiet) break; 1208 if (be_wewy_wewy_quiet) break;
835 tmp = strrchr(filename, '/'); 1209 tmp = strrchr(elf->filename, '/');
836 tmp = (tmp == NULL ? filename : tmp+1); 1210 tmp = (tmp == NULL ? elf->filename : tmp+1);
837 xstrcat(&out_buffer, tmp, &out_len); 1211 xstrcat(&out_buffer, tmp, &out_len);
838 break; 1212 break;
839 case 'o': out = get_elfetype(elf); break; 1213 case 'o': out = get_elfetype(elf); break;
840 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1214 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
841 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break; 1215 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
842 case 't': out = scanelf_file_textrel(elf, &found_textrel); break; 1216 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
843 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break; 1217 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
844 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break; 1218 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1219 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1220 case 'D': out = get_endian(elf); break;
1221 case 'O': out = getstr_perms(elf->filename); break;
845 case 'n': 1222 case 'n':
846 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break; 1223 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
847 case 'i': out = scanelf_file_interp(elf, &found_interp); break; 1224 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
848 case 'b': out = scanelf_file_bind(elf, &found_bind); break; 1225 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
849 case 'S': out = scanelf_file_soname(elf, &found_soname); break; 1226 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
850 case 's': out = scanelf_file_sym(elf, &found_sym); break; 1227 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1228 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1229 case 'a': out = get_elfemtype(elf); break;
851 default: warnf("'%c' has no scan code?", out_format[i]); 1230 default: warnf("'%c' has no scan code?", out_format[i]);
852 } 1231 }
853 if (out) { 1232 if (out) {
854 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */ 1233 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
855 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL) 1234 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
860 } 1239 }
861 1240
862#define FOUND_SOMETHING() \ 1241#define FOUND_SOMETHING() \
863 (found_pax || found_phdr || found_relro || found_load || found_textrel || \ 1242 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
864 found_rpath || found_needed || found_interp || found_bind || \ 1243 found_rpath || found_needed || found_interp || found_bind || \
865 found_soname || found_sym || found_lib || found_textrels) 1244 found_soname || found_sym || found_lib || found_textrels || found_section )
866 1245
867 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) { 1246 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
868 xchrcat(&out_buffer, ' ', &out_len); 1247 xchrcat(&out_buffer, ' ', &out_len);
869 xstrcat(&out_buffer, filename, &out_len); 1248 xstrcat(&out_buffer, elf->filename, &out_len);
870 } 1249 }
871 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) { 1250 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
872 puts(out_buffer); 1251 puts(out_buffer);
873 fflush(stdout); 1252 fflush(stdout);
874 } 1253 }
875 1254
1255 return 0;
1256}
1257
1258/* scan a single elf */
1259static int scanelf_elf(const char *filename, int fd, size_t len)
1260{
1261 int ret = 1;
1262 elfobj *elf;
1263
1264 /* verify this is real ELF */
1265 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1266 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1267 return ret;
1268 }
1269 switch (match_bits) {
1270 case 32:
1271 if (elf->elf_class != ELFCLASS32)
1272 goto label_done;
1273 break;
1274 case 64:
1275 if (elf->elf_class != ELFCLASS64)
1276 goto label_done;
1277 break;
1278 default: break;
1279 }
1280 if (strlen(match_etypes)) {
1281 char sbuf[126];
1282 strncpy(sbuf, match_etypes, sizeof(sbuf));
1283 if (strchr(match_etypes, ',') != NULL) {
1284 char *p;
1285 while ((p = strrchr(sbuf, ',')) != NULL) {
1286 *p = 0;
1287 if (etype_lookup(p+1) == get_etype(elf))
1288 goto label_ret;
1289 }
1290 }
1291 if (etype_lookup(sbuf) != get_etype(elf))
1292 goto label_done;
1293 }
1294
1295label_ret:
1296 ret = scanelf_elfobj(elf);
1297
1298label_done:
876 unreadelf(elf); 1299 unreadelf(elf);
1300 return ret;
1301}
1302
1303/* scan an archive of elfs */
1304static int scanelf_archive(const char *filename, int fd, size_t len)
1305{
1306 archive_handle *ar;
1307 archive_member *m;
1308 char *ar_buffer;
1309 elfobj *elf;
1310
1311 ar = ar_open_fd(filename, fd);
1312 if (ar == NULL)
1313 return 1;
1314
1315 ar_buffer = (char*)mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1316 while ((m=ar_next(ar)) != NULL) {
1317 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size);
1318 if (elf) {
1319 scanelf_elfobj(elf);
1320 unreadelf(elf);
1321 }
1322 }
1323 munmap(ar_buffer, len);
1324
1325 return 0;
1326}
1327/* scan a file which may be an elf or an archive or some other magical beast */
1328static int scanelf_file(const char *filename, const struct stat *st_cache)
1329{
1330 const struct stat *st = st_cache;
1331 struct stat symlink_st;
1332 int fd;
1333
1334 /* always handle regular files and handle symlinked files if no -y */
1335 if (S_ISLNK(st->st_mode)) {
1336 if (!scan_symlink) return 1;
1337 stat(filename, &symlink_st);
1338 st = &symlink_st;
1339 }
1340
1341 if (!S_ISREG(st->st_mode)) {
1342 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1343 return 1;
1344 }
1345
1346 if (match_perms) {
1347 if ((st->st_mode | match_perms) != st->st_mode)
1348 return 1;
1349 }
1350 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1351 return 1;
1352
1353 if (scanelf_elf(filename, fd, st->st_size) == 1 && scan_archives)
1354 /* if it isn't an ELF, maybe it's an .a archive */
1355 scanelf_archive(filename, fd, st->st_size);
1356
1357 close(fd);
1358 return 0;
877} 1359}
878 1360
879/* scan a directory for ET_EXEC files and print when we find one */ 1361/* scan a directory for ET_EXEC files and print when we find one */
880static void scanelf_dir(const char *path) 1362static int scanelf_dir(const char *path)
881{ 1363{
882 register DIR *dir; 1364 register DIR *dir;
883 register struct dirent *dentry; 1365 register struct dirent *dentry;
884 struct stat st_top, st; 1366 struct stat st_top, st;
885 char buf[_POSIX_PATH_MAX]; 1367 char buf[__PAX_UTILS_PATH_MAX];
886 size_t pathlen = 0, len = 0; 1368 size_t pathlen = 0, len = 0;
1369 int ret = 0;
887 1370
888 /* make sure path exists */ 1371 /* make sure path exists */
889 if (lstat(path, &st_top) == -1) { 1372 if (lstat(path, &st_top) == -1) {
890 if (be_verbose > 2) printf("%s: does not exist\n", path); 1373 if (be_verbose > 2) printf("%s: does not exist\n", path);
891 return; 1374 return 1;
892 } 1375 }
893 1376
894 /* ok, if it isn't a directory, assume we can open it */ 1377 /* ok, if it isn't a directory, assume we can open it */
895 if (!S_ISDIR(st_top.st_mode)) { 1378 if (!S_ISDIR(st_top.st_mode)) {
896 scanelf_file(path); 1379 return scanelf_file(path, &st_top);
897 return;
898 } 1380 }
899 1381
900 /* now scan the dir looking for fun stuff */ 1382 /* now scan the dir looking for fun stuff */
901 if ((dir = opendir(path)) == NULL) { 1383 if ((dir = opendir(path)) == NULL) {
902 warnf("could not opendir %s: %s", path, strerror(errno)); 1384 warnf("could not opendir %s: %s", path, strerror(errno));
903 return; 1385 return 1;
904 } 1386 }
905 if (be_verbose) printf("%s: scanning dir\n", path); 1387 if (be_verbose > 1) printf("%s: scanning dir\n", path);
906 1388
907 pathlen = strlen(path); 1389 pathlen = strlen(path);
908 while ((dentry = readdir(dir))) { 1390 while ((dentry = readdir(dir))) {
909 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1391 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
910 continue; 1392 continue;
912 if (len >= sizeof(buf)) { 1394 if (len >= sizeof(buf)) {
913 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path, 1395 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
914 (unsigned long)len, (unsigned long)sizeof(buf)); 1396 (unsigned long)len, (unsigned long)sizeof(buf));
915 continue; 1397 continue;
916 } 1398 }
917 sprintf(buf, "%s/%s", path, dentry->d_name); 1399 snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name);
918 if (lstat(buf, &st) != -1) { 1400 if (lstat(buf, &st) != -1) {
919 if (S_ISREG(st.st_mode)) 1401 if (S_ISREG(st.st_mode))
920 scanelf_file(buf); 1402 ret = scanelf_file(buf, &st);
921 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1403 else if (dir_recurse && S_ISDIR(st.st_mode)) {
922 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1404 if (dir_crossmount || (st_top.st_dev == st.st_dev))
923 scanelf_dir(buf); 1405 ret = scanelf_dir(buf);
924 } 1406 }
925 } 1407 }
926 } 1408 }
927 closedir(dir); 1409 closedir(dir);
1410 return ret;
928} 1411}
929 1412
930static int scanelf_from_file(char *filename) 1413static int scanelf_from_file(const char *filename)
931{ 1414{
932 FILE *fp = NULL; 1415 FILE *fp = NULL;
933 char *p; 1416 char *p;
934 char path[_POSIX_PATH_MAX]; 1417 char path[__PAX_UTILS_PATH_MAX];
1418 int ret = 0;
935 1419
936 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL)) 1420 if (strcmp(filename, "-") == 0)
937 fp = stdin; 1421 fp = stdin;
938 else if ((fp = fopen(filename, "r")) == NULL) 1422 else if ((fp = fopen(filename, "r")) == NULL)
939 return 1; 1423 return 1;
940 1424
941 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1425 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
942 if ((p = strchr(path, '\n')) != NULL) 1426 if ((p = strchr(path, '\n')) != NULL)
943 *p = 0; 1427 *p = 0;
944 search_path = path; 1428 search_path = path;
945 scanelf_dir(path); 1429 ret = scanelf_dir(path);
946 } 1430 }
947 if (fp != stdin) 1431 if (fp != stdin)
948 fclose(fp); 1432 fclose(fp);
949 return 0; 1433 return ret;
950} 1434}
951 1435
952static void load_ld_so_conf() 1436#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1437
1438static int load_ld_cache_config(int i, const char *fname)
953{ 1439{
954 FILE *fp = NULL; 1440 FILE *fp = NULL;
955 char *p; 1441 char *p;
956 char path[_POSIX_PATH_MAX]; 1442 char path[__PAX_UTILS_PATH_MAX];
957 int i = 0;
958 1443
959 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1444 if (i + 1 == ARRAY_SIZE(ldpaths))
960 return; 1445 return i;
961 1446
1447 if ((fp = fopen(fname, "r")) == NULL)
1448 return i;
1449
962 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1450 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
963 if (*path != '/')
964 continue;
965
966 if ((p = strrchr(path, '\r')) != NULL) 1451 if ((p = strrchr(path, '\r')) != NULL)
967 *p = 0; 1452 *p = 0;
968 if ((p = strchr(path, '\n')) != NULL) 1453 if ((p = strchr(path, '\n')) != NULL)
969 *p = 0; 1454 *p = 0;
1455#ifdef __linux__
1456 /* recursive includes of the same file will make this segfault. */
1457 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1458 glob64_t gl;
1459 size_t x;
1460 char gpath[__PAX_UTILS_PATH_MAX];
1461
1462 memset(gpath, 0, sizeof(gpath));
1463
1464 if (path[8] != '/')
1465 snprintf(gpath, sizeof(gpath), "/etc/%s", &path[8]);
1466 else
1467 strncpy(gpath, &path[8], sizeof(gpath));
1468
1469 if ((glob64(gpath, 0, NULL, &gl)) == 0) {
1470 for (x = 0; x < gl.gl_pathc; ++x) {
1471 /* try to avoid direct loops */
1472 if (strcmp(gl.gl_pathv[x], fname) == 0)
1473 continue;
1474 i = load_ld_cache_config(i, gl.gl_pathv[x]);
1475 if (i + 1 >= ARRAY_SIZE(ldpaths)) {
1476 globfree64(&gl);
1477 return i;
1478 }
1479 }
1480 globfree64 (&gl);
1481 continue;
1482 }
1483 }
1484#endif
1485 if (*path != '/')
1486 continue;
970 1487
971 ldpaths[i++] = xstrdup(path); 1488 ldpaths[i++] = xstrdup(path);
972 1489
973 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths)) 1490 if (i + 1 == ARRAY_SIZE(ldpaths))
974 break; 1491 break;
975 } 1492 }
976 ldpaths[i] = NULL; 1493 ldpaths[i] = NULL;
977 1494
978 fclose(fp); 1495 fclose(fp);
1496 return i;
979} 1497}
1498
1499#elif defined(__FreeBSD__) || (__DragonFly__)
1500
1501static int load_ld_cache_config(int i, const char *fname)
1502{
1503 FILE *fp = NULL;
1504 char *b = NULL, *p;
1505 struct elfhints_hdr hdr;
1506
1507 if (i + 1 == ARRAY_SIZE(ldpaths))
1508 return i;
1509
1510 if ((fp = fopen(fname, "r")) == NULL)
1511 return i;
1512
1513 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1514 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1515 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1516 {
1517 fclose(fp);
1518 return i;
1519 }
1520
1521 b = xmalloc(hdr.dirlistlen + 1);
1522 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1523 fclose(fp);
1524 free(b);
1525 return i;
1526 }
1527
1528 while ((p = strsep(&b, ":"))) {
1529 if (*p == '\0') continue;
1530 ldpaths[i++] = xstrdup(p);
1531
1532 if (i + 1 == ARRAY_SIZE(ldpaths))
1533 break;
1534 }
1535 ldpaths[i] = NULL;
1536
1537 free(b);
1538 fclose(fp);
1539 return i;
1540}
1541
1542#else
1543
1544#warning Cache config support not implemented for your target
1545static int load_ld_cache_config(int i, const char *fname)
1546{
1547 memset(ldpaths, 0x00, sizeof(ldpaths));
1548}
1549
1550#endif
980 1551
981/* scan /etc/ld.so.conf for paths */ 1552/* scan /etc/ld.so.conf for paths */
982static void scanelf_ldpath() 1553static void scanelf_ldpath(void)
983{ 1554{
984 char scan_l, scan_ul, scan_ull; 1555 char scan_l, scan_ul, scan_ull;
985 int i = 0; 1556 int i = 0;
986 1557
987 if (!ldpaths[0]) 1558 if (!ldpaths[0])
1001 if (!scan_ul) scanelf_dir("/usr/lib"); 1572 if (!scan_ul) scanelf_dir("/usr/lib");
1002 if (!scan_ull) scanelf_dir("/usr/local/lib"); 1573 if (!scan_ull) scanelf_dir("/usr/local/lib");
1003} 1574}
1004 1575
1005/* scan env PATH for paths */ 1576/* scan env PATH for paths */
1006static void scanelf_envpath() 1577static void scanelf_envpath(void)
1007{ 1578{
1008 char *path, *p; 1579 char *path, *p;
1009 1580
1010 path = getenv("PATH"); 1581 path = getenv("PATH");
1011 if (!path) 1582 if (!path)
1019 1590
1020 free(path); 1591 free(path);
1021} 1592}
1022 1593
1023 1594
1024 1595/* usage / invocation handling functions */ /* Free Flags: c d j u w C G H I J K P Q U W Y Z */
1025/* usage / invocation handling functions */
1026#define PARSE_FLAGS "plRmyxetrnibSs:gN:TaqvF:f:o:BhV" 1596#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DO:BhV"
1027#define a_argument required_argument 1597#define a_argument required_argument
1028static struct option const long_opts[] = { 1598static struct option const long_opts[] = {
1029 {"path", no_argument, NULL, 'p'}, 1599 {"path", no_argument, NULL, 'p'},
1030 {"ldpath", no_argument, NULL, 'l'}, 1600 {"ldpath", no_argument, NULL, 'l'},
1031 {"recursive", no_argument, NULL, 'R'}, 1601 {"recursive", no_argument, NULL, 'R'},
1032 {"mount", no_argument, NULL, 'm'}, 1602 {"mount", no_argument, NULL, 'm'},
1033 {"symlink", no_argument, NULL, 'y'}, 1603 {"symlink", no_argument, NULL, 'y'},
1604 {"archives", no_argument, NULL, 'A'},
1605 {"ldcache", no_argument, NULL, 'L'},
1606 {"fix", no_argument, NULL, 'X'},
1607 {"setpax", a_argument, NULL, 'z'},
1034 {"pax", no_argument, NULL, 'x'}, 1608 {"pax", no_argument, NULL, 'x'},
1035 {"header", no_argument, NULL, 'e'}, 1609 {"header", no_argument, NULL, 'e'},
1036 {"textrel", no_argument, NULL, 't'}, 1610 {"textrel", no_argument, NULL, 't'},
1037 {"rpath", no_argument, NULL, 'r'}, 1611 {"rpath", no_argument, NULL, 'r'},
1038 {"needed", no_argument, NULL, 'n'}, 1612 {"needed", no_argument, NULL, 'n'},
1039 {"interp", no_argument, NULL, 'i'}, 1613 {"interp", no_argument, NULL, 'i'},
1040 {"bind", no_argument, NULL, 'b'}, 1614 {"bind", no_argument, NULL, 'b'},
1041 {"soname", no_argument, NULL, 'S'}, 1615 {"soname", no_argument, NULL, 'S'},
1042 {"symbol", a_argument, NULL, 's'}, 1616 {"symbol", a_argument, NULL, 's'},
1617 {"section", a_argument, NULL, 'k'},
1043 {"lib", a_argument, NULL, 'N'}, 1618 {"lib", a_argument, NULL, 'N'},
1044 {"gmatch", no_argument, NULL, 'g'}, 1619 {"gmatch", no_argument, NULL, 'g'},
1045 {"textrels", no_argument, NULL, 'T'}, 1620 {"textrels", no_argument, NULL, 'T'},
1621 {"etype", a_argument, NULL, 'E'},
1622 {"bits", a_argument, NULL, 'M'},
1623 {"endian", no_argument, NULL, 'D'},
1624 {"perms", a_argument, NULL, 'O'},
1046 {"all", no_argument, NULL, 'a'}, 1625 {"all", no_argument, NULL, 'a'},
1047 {"quiet", no_argument, NULL, 'q'}, 1626 {"quiet", no_argument, NULL, 'q'},
1048 {"verbose", no_argument, NULL, 'v'}, 1627 {"verbose", no_argument, NULL, 'v'},
1049 {"format", a_argument, NULL, 'F'}, 1628 {"format", a_argument, NULL, 'F'},
1050 {"from", a_argument, NULL, 'f'}, 1629 {"from", a_argument, NULL, 'f'},
1058static const char *opts_help[] = { 1637static const char *opts_help[] = {
1059 "Scan all directories in PATH environment", 1638 "Scan all directories in PATH environment",
1060 "Scan all directories in /etc/ld.so.conf", 1639 "Scan all directories in /etc/ld.so.conf",
1061 "Scan directories recursively", 1640 "Scan directories recursively",
1062 "Don't recursively cross mount points", 1641 "Don't recursively cross mount points",
1063 "Don't scan symlinks\n", 1642 "Don't scan symlinks",
1643 "Scan archives (.a files)",
1644 "Utilize ld.so.cache information (use with -r/-n)",
1645 "Try and 'fix' bad things (use with -r/-e)",
1646 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1064 "Print PaX markings", 1647 "Print PaX markings",
1065 "Print GNU_STACK/PT_LOAD markings", 1648 "Print GNU_STACK/PT_LOAD markings",
1066 "Print TEXTREL information", 1649 "Print TEXTREL information",
1067 "Print RPATH information", 1650 "Print RPATH information",
1068 "Print NEEDED information", 1651 "Print NEEDED information",
1069 "Print INTERP information", 1652 "Print INTERP information",
1070 "Print BIND information", 1653 "Print BIND information",
1071 "Print SONAME information", 1654 "Print SONAME information",
1072 "Find a specified symbol", 1655 "Find a specified symbol",
1656 "Find a specified section",
1073 "Find a specified library", 1657 "Find a specified library",
1074 "Use strncmp to match libraries. (use with -N)", 1658 "Use strncmp to match libraries. (use with -N)",
1075 "Locate cause of TEXTREL", 1659 "Locate cause of TEXTREL",
1660 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1661 "Print only ELF files matching numeric bits",
1662 "Print Endianness",
1663 "Print only ELF files matching octal permissions",
1076 "Print all scanned info (-x -e -t -r -b)\n", 1664 "Print all scanned info (-x -e -t -r -b)\n",
1077 "Only output 'bad' things", 1665 "Only output 'bad' things",
1078 "Be verbose (can be specified more than once)", 1666 "Be verbose (can be specified more than once)",
1079 "Use specified format for output", 1667 "Use specified format for output",
1080 "Read input stream from a filename", 1668 "Read input stream from a filename",
1088/* display usage and exit */ 1676/* display usage and exit */
1089static void usage(int status) 1677static void usage(int status)
1090{ 1678{
1091 unsigned long i; 1679 unsigned long i;
1092 printf("* Scan ELF binaries for stuff\n\n" 1680 printf("* Scan ELF binaries for stuff\n\n"
1093 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0); 1681 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1094 printf("Options: -[%s]\n", PARSE_FLAGS); 1682 printf("Options: -[%s]\n", PARSE_FLAGS);
1095 for (i = 0; long_opts[i].name; ++i) 1683 for (i = 0; long_opts[i].name; ++i)
1096 if (long_opts[i].has_arg == no_argument) 1684 if (long_opts[i].has_arg == no_argument)
1097 printf(" -%c, --%-13s* %s\n", long_opts[i].val, 1685 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
1098 long_opts[i].name, opts_help[i]); 1686 long_opts[i].name, opts_help[i]);
1099 else 1687 else
1100 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val, 1688 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
1101 long_opts[i].name, opts_help[i]); 1689 long_opts[i].name, opts_help[i]);
1102 1690
1103 if (status != EXIT_SUCCESS) 1691 puts("\nFor more information, see the scanelf(1) manpage");
1104 exit(status);
1105
1106 puts("\nThe format modifiers for the -F option are:");
1107 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1108 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1109 puts(" i INTERP \tb BIND \ts symbol");
1110 puts(" N library \to Type \tT TEXTRELs");
1111 puts(" S SONAME");
1112 puts(" p filename (with search path removed)");
1113 puts(" f filename (short name/basename)");
1114 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1115
1116 exit(status); 1692 exit(status);
1117} 1693}
1118 1694
1119/* parse command line arguments and preform needed actions */ 1695/* parse command line arguments and preform needed actions */
1696#define do_pax_state(option, flag) \
1697 if (islower(option)) { \
1698 flags &= ~PF_##flag; \
1699 flags |= PF_NO##flag; \
1700 } else { \
1701 flags &= ~PF_NO##flag; \
1702 flags |= PF_##flag; \
1703 }
1120static void parseargs(int argc, char *argv[]) 1704static int parseargs(int argc, char *argv[])
1121{ 1705{
1122 int i; 1706 int i;
1123 char *from_file = NULL; 1707 const char *from_file = NULL;
1708 int ret = 0;
1124 1709
1125 opterr = 0; 1710 opterr = 0;
1126 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 1711 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1127 switch (i) { 1712 switch (i) {
1128 1713
1132 VERSION, __FILE__, __DATE__, rcsid, argv0); 1717 VERSION, __FILE__, __DATE__, rcsid, argv0);
1133 exit(EXIT_SUCCESS); 1718 exit(EXIT_SUCCESS);
1134 break; 1719 break;
1135 case 'h': usage(EXIT_SUCCESS); break; 1720 case 'h': usage(EXIT_SUCCESS); break;
1136 case 'f': 1721 case 'f':
1137 if (from_file) err("Don't specify -f twice"); 1722 if (from_file) warn("You prob don't want to specify -f twice");
1138 from_file = xstrdup(optarg); 1723 from_file = optarg;
1724 break;
1725 case 'E':
1726 strncpy(match_etypes, optarg, sizeof(match_etypes));
1727 break;
1728 case 'M':
1729 match_bits = atoi(optarg);
1730 if (match_bits == 0) {
1731 if (strcmp(optarg, "ELFCLASS32") == 0)
1732 match_bits = 32;
1733 if (strcmp(optarg, "ELFCLASS64") == 0)
1734 match_bits = 64;
1735 }
1736 break;
1737 case 'O':
1738 if (sscanf(optarg, "%o", &match_perms) == (-1))
1739 match_bits = 0;
1139 break; 1740 break;
1140 case 'o': { 1741 case 'o': {
1141 FILE *fp = NULL;
1142 if ((fp = freopen(optarg, "w", stdout)) == NULL) 1742 if (freopen(optarg, "w", stdout) == NULL)
1143 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 1743 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1144 SET_STDOUT(fp);
1145 break; 1744 break;
1146 } 1745 }
1147 1746 case 'k':
1747 if (find_section) warn("You prob don't want to specify -k twice");
1748 find_section = optarg;
1749 break;
1148 case 's': { 1750 case 's': {
1149 if (find_sym) warn("You prob don't want to specify -s twice"); 1751 if (find_sym) warn("You prob don't want to specify -s twice");
1150 find_sym = optarg; 1752 find_sym = optarg;
1151 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1)); 1753 versioned_symname = xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1152 sprintf(versioned_symname, "%s@", find_sym); 1754 sprintf(versioned_symname, "%s@", find_sym);
1153 break; 1755 break;
1154 } 1756 }
1155 case 'N': { 1757 case 'N': {
1156 if (find_lib) warn("You prob don't want to specify -N twice"); 1758 if (find_lib) warn("You prob don't want to specify -N twice");
1161 case 'F': { 1763 case 'F': {
1162 if (out_format) warn("You prob don't want to specify -F twice"); 1764 if (out_format) warn("You prob don't want to specify -F twice");
1163 out_format = optarg; 1765 out_format = optarg;
1164 break; 1766 break;
1165 } 1767 }
1768 case 'z': {
1769 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1770 size_t x;
1166 1771
1772 for (x = 0; x < strlen(optarg); x++) {
1773 switch (optarg[x]) {
1774 case 'p':
1775 case 'P':
1776 do_pax_state(optarg[x], PAGEEXEC);
1777 break;
1778 case 's':
1779 case 'S':
1780 do_pax_state(optarg[x], SEGMEXEC);
1781 break;
1782 case 'm':
1783 case 'M':
1784 do_pax_state(optarg[x], MPROTECT);
1785 break;
1786 case 'e':
1787 case 'E':
1788 do_pax_state(optarg[x], EMUTRAMP);
1789 break;
1790 case 'r':
1791 case 'R':
1792 do_pax_state(optarg[x], RANDMMAP);
1793 break;
1794 case 'x':
1795 case 'X':
1796 do_pax_state(optarg[x], RANDEXEC);
1797 break;
1798 default:
1799 break;
1800 }
1801 }
1802 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
1803 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
1804 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
1805 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
1806 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1807 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1808 setpax = flags;
1809 break;
1810 }
1167 case 'g': gmatch = 1; 1811 case 'g': g_match = 1; break;
1812 case 'L': use_ldcache = 1; break;
1168 case 'y': scan_symlink = 0; break; 1813 case 'y': scan_symlink = 0; break;
1814 case 'A': scan_archives = 1; break;
1169 case 'B': show_banner = 0; break; 1815 case 'B': show_banner = 0; break;
1170 case 'l': scan_ldpath = 1; break; 1816 case 'l': scan_ldpath = 1; break;
1171 case 'p': scan_envpath = 1; break; 1817 case 'p': scan_envpath = 1; break;
1172 case 'R': dir_recurse = 1; break; 1818 case 'R': dir_recurse = 1; break;
1173 case 'm': dir_crossmount = 0; break; 1819 case 'm': dir_crossmount = 0; break;
1820 case 'X': ++fix_elf; break;
1174 case 'x': show_pax = 1; break; 1821 case 'x': show_pax = 1; break;
1175 case 'e': show_phdr = 1; break; 1822 case 'e': show_phdr = 1; break;
1176 case 't': show_textrel = 1; break; 1823 case 't': show_textrel = 1; break;
1177 case 'r': show_rpath = 1; break; 1824 case 'r': show_rpath = 1; break;
1178 case 'n': show_needed = 1; break; 1825 case 'n': show_needed = 1; break;
1180 case 'b': show_bind = 1; break; 1827 case 'b': show_bind = 1; break;
1181 case 'S': show_soname = 1; break; 1828 case 'S': show_soname = 1; break;
1182 case 'T': show_textrels = 1; break; 1829 case 'T': show_textrels = 1; break;
1183 case 'q': be_quiet = 1; break; 1830 case 'q': be_quiet = 1; break;
1184 case 'v': be_verbose = (be_verbose % 20) + 1; break; 1831 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1185 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break; 1832 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
1186 1833 case 'D': show_endian = 1; break;
1187 case ':': 1834 case ':':
1188 err("Option missing parameter\n"); 1835 err("Option '%c' is missing parameter", optopt);
1189 case '?': 1836 case '?':
1190 err("Unknown option\n"); 1837 err("Unknown option '%c' or argument missing", optopt);
1191 default: 1838 default:
1192 err("Unhandled option '%c'", i); 1839 err("Unhandled option '%c'; please report this", i);
1193 }
1194 } 1840 }
1195 1841 }
1842 if (show_textrels && be_verbose) {
1843 if (which("objdump") != NULL)
1844 has_objdump = 1;
1845 }
1196 /* let the format option override all other options */ 1846 /* let the format option override all other options */
1197 if (out_format) { 1847 if (out_format) {
1198 show_pax = show_phdr = show_textrel = show_rpath = \ 1848 show_pax = show_phdr = show_textrel = show_rpath = \
1199 show_needed = show_interp = show_bind = show_soname = \ 1849 show_needed = show_interp = show_bind = show_soname = \
1200 show_textrels = 0; 1850 show_textrels = show_perms = show_endian = 0;
1201 for (i = 0; out_format[i]; ++i) { 1851 for (i = 0; out_format[i]; ++i) {
1202 if (!IS_MODIFIER(out_format[i])) continue; 1852 if (!IS_MODIFIER(out_format[i])) continue;
1203 1853
1204 switch (out_format[++i]) { 1854 switch (out_format[++i]) {
1855 case '+': break;
1205 case '%': break; 1856 case '%': break;
1206 case '#': break; 1857 case '#': break;
1207 case 'F': break; 1858 case 'F': break;
1208 case 'p': break; 1859 case 'p': break;
1209 case 'f': break; 1860 case 'f': break;
1861 case 'k': break;
1210 case 's': break; 1862 case 's': break;
1211 case 'N': break; 1863 case 'N': break;
1212 case 'o': break; 1864 case 'o': break;
1865 case 'a': break;
1866 case 'M': break;
1867 case 'D': show_endian = 1; break;
1868 case 'O': show_perms = 1; break;
1213 case 'x': show_pax = 1; break; 1869 case 'x': show_pax = 1; break;
1214 case 'e': show_phdr = 1; break; 1870 case 'e': show_phdr = 1; break;
1215 case 't': show_textrel = 1; break; 1871 case 't': show_textrel = 1; break;
1216 case 'r': show_rpath = 1; break; 1872 case 'r': show_rpath = 1; break;
1217 case 'n': show_needed = 1; break; 1873 case 'n': show_needed = 1; break;
1218 case 'i': show_interp = 1; break; 1874 case 'i': show_interp = 1; break;
1219 case 'b': show_bind = 1; break; 1875 case 'b': show_bind = 1; break;
1220 case 'S': show_soname = 1; break; 1876 case 'S': show_soname = 1; break;
1221 case 'T': show_textrels = 1; break; 1877 case 'T': show_textrels = 1; break;
1222 default: 1878 default:
1223 err("Invalid format specifier '%c' (byte %i)", 1879 err("Invalid format specifier '%c' (byte %i)",
1224 out_format[i], i+1); 1880 out_format[i], i+1);
1225 } 1881 }
1226 } 1882 }
1227 1883
1228 /* construct our default format */ 1884 /* construct our default format */
1229 } else { 1885 } else {
1230 size_t fmt_len = 30; 1886 size_t fmt_len = 30;
1231 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 1887 out_format = xmalloc(sizeof(char) * fmt_len);
1232 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 1888 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1233 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len); 1889 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1890 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
1891 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
1234 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len); 1892 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1235 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 1893 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1236 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 1894 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1237 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 1895 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1238 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 1896 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1239 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len); 1897 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1240 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len); 1898 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1241 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len); 1899 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1242 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len); 1900 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1901 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1243 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len); 1902 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1244 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 1903 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1245 } 1904 }
1246 if (be_verbose > 2) printf("Format: %s\n", out_format); 1905 if (be_verbose > 2) printf("Format: %s\n", out_format);
1247 1906
1248 /* now lets actually do the scanning */ 1907 /* now lets actually do the scanning */
1249 if (scan_ldpath || (show_rpath && be_quiet)) 1908 if (scan_ldpath || use_ldcache)
1250 load_ld_so_conf(); 1909 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
1251 if (scan_ldpath) scanelf_ldpath(); 1910 if (scan_ldpath) scanelf_ldpath();
1252 if (scan_envpath) scanelf_envpath(); 1911 if (scan_envpath) scanelf_envpath();
1912 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
1913 from_file = "-";
1253 if (from_file) { 1914 if (from_file) {
1254 scanelf_from_file(from_file); 1915 scanelf_from_file(from_file);
1255 free(from_file);
1256 from_file = *argv; 1916 from_file = *argv;
1257 } 1917 }
1258 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file) 1918 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1259 err("Nothing to scan !?"); 1919 err("Nothing to scan !?");
1260 while (optind < argc) { 1920 while (optind < argc) {
1261 search_path = argv[optind++]; 1921 search_path = argv[optind++];
1262 scanelf_dir(search_path); 1922 ret = scanelf_dir(search_path);
1263 } 1923 }
1264 1924
1265 /* clean up */ 1925 /* clean up */
1266 if (versioned_symname) free(versioned_symname); 1926 free(versioned_symname);
1267 for (i = 0; ldpaths[i]; ++i) 1927 for (i = 0; ldpaths[i]; ++i)
1268 free(ldpaths[i]); 1928 free(ldpaths[i]);
1269}
1270 1929
1271 1930 if (ldcache != 0)
1272 1931 munmap(ldcache, ldcache_size);
1273/* utility funcs */
1274static char *xstrdup(const char *s)
1275{
1276 char *ret = strdup(s);
1277 if (!ret) err("Could not strdup(): %s", strerror(errno));
1278 return ret; 1932 return ret;
1279} 1933}
1280static void *xmalloc(size_t size)
1281{
1282 void *ret = malloc(size);
1283 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1284 return ret;
1285}
1286static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
1287{
1288 size_t new_len;
1289 1934
1290 new_len = strlen(*dst) + strlen(src); 1935static char **get_split_env(const char *envvar)
1291 if (*curr_len <= new_len) {
1292 *curr_len = new_len + (*curr_len / 2);
1293 *dst = realloc(*dst, *curr_len);
1294 if (!*dst)
1295 err("could not realloc() %li bytes", (unsigned long)*curr_len);
1296 }
1297
1298 if (n)
1299 strncat(*dst, src, n);
1300 else
1301 strcat(*dst, src);
1302}
1303static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1304{ 1936{
1305 static char my_app[2]; 1937 const char *delims = " \t\n";
1306 my_app[0] = append; 1938 char **envvals = NULL;
1307 my_app[1] = '\0'; 1939 char *env, *s;
1308 xstrcat(dst, my_app, curr_len); 1940 int nentry;
1309}
1310 1941
1942 if ((env = getenv(envvar)) == NULL)
1943 return NULL;
1944
1945 env = xstrdup(env);
1946 if (env == NULL)
1947 return NULL;
1948
1949 s = strtok(env, delims);
1950 if (s == NULL) {
1951 free(env);
1952 return NULL;
1953 }
1954
1955 nentry = 0;
1956 while (s != NULL) {
1957 ++nentry;
1958 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
1959 envvals[nentry-1] = s;
1960 s = strtok(NULL, delims);
1961 }
1962 envvals[nentry] = NULL;
1963
1964 /* don't want to free(env) as it contains the memory that backs
1965 * the envvals array of strings */
1966 return envvals;
1967}
1968
1969static void parseenv(void)
1970{
1971 qa_textrels = get_split_env("QA_TEXTRELS");
1972 qa_execstack = get_split_env("QA_EXECSTACK");
1973 qa_wx_load = get_split_env("QA_WX_LOAD");
1974}
1975
1976#ifdef __PAX_UTILS_CLEANUP
1977static void cleanup(void)
1978{
1979 free(out_format);
1980 free(qa_textrels);
1981 free(qa_execstack);
1982 free(qa_wx_load);
1983}
1984#endif
1311 1985
1312 1986
1313int main(int argc, char *argv[]) 1987int main(int argc, char *argv[])
1314{ 1988{
1989 int ret;
1315 if (argc < 2) 1990 if (argc < 2)
1316 usage(EXIT_FAILURE); 1991 usage(EXIT_FAILURE);
1992 parseenv();
1317 parseargs(argc, argv); 1993 ret = parseargs(argc, argv);
1318 fclose(stdout); 1994 fclose(stdout);
1319#ifdef __BOUNDS_CHECKING_ON 1995#ifdef __PAX_UTILS_CLEANUP
1320 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()"); 1996 cleanup();
1997 warn("The calls to add/delete heap should be off:\n"
1998 "\t- 1 due to the out_buffer not being freed in scanelf_file()\n"
1999 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
1321#endif 2000#endif
1322 return EXIT_SUCCESS; 2001 return ret;
1323} 2002}
2003
2004
2005/* Match filename against entries in matchlist, return TRUE
2006 * if the file is listed */
2007static int file_matches_list(const char *filename, char **matchlist)
2008{
2009 char **file;
2010 char *match;
2011 char buf[__PAX_UTILS_PATH_MAX];
2012
2013 if (matchlist == NULL)
2014 return 0;
2015
2016 for (file = matchlist; *file != NULL; file++) {
2017 if (search_path) {
2018 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2019 match = buf;
2020 } else {
2021 match = *file;
2022 }
2023 if (fnmatch(match, filename, 0) == 0)
2024 return 1;
2025 }
2026 return 0;
2027}

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