/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.93 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 1.93 2005/12/10 04:07:55 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 1.93 2005/12/10 04:07:55 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 xstrcat(char **dst, const char *src, size_t *curr_len);
41static inline void xchrcat(char **dst, const char append, size_t *curr_len);
42 31
43/* variables to control behavior */ 32/* variables to control behavior */
33static char match_etypes[126] = "";
44static char *ldpaths[256]; 34static char *ldpaths[256];
45static char scan_ldpath = 0; 35static char scan_ldpath = 0;
46static char scan_envpath = 0; 36static char scan_envpath = 0;
47static char scan_symlink = 1; 37static char scan_symlink = 1;
38static char scan_archives = 0;
48static char dir_recurse = 0; 39static char dir_recurse = 0;
49static char dir_crossmount = 1; 40static char dir_crossmount = 1;
50static char show_pax = 0; 41static char show_pax = 0;
42static char show_perms = 0;
51static char show_phdr = 0; 43static char show_phdr = 0;
52static char show_textrel = 0; 44static char show_textrel = 0;
53static char show_rpath = 0; 45static char show_rpath = 0;
54static char show_needed = 0; 46static char show_needed = 0;
55static char show_interp = 0; 47static char show_interp = 0;
56static char show_bind = 0; 48static char show_bind = 0;
57static char show_soname = 0; 49static char show_soname = 0;
58static char show_textrels = 0; 50static char show_textrels = 0;
59static char show_banner = 1; 51static char show_banner = 1;
52static char show_endian = 0;
60static char be_quiet = 0; 53static char be_quiet = 0;
61static char be_verbose = 0; 54static char be_verbose = 0;
62static char be_wewy_wewy_quiet = 0; 55static char be_wewy_wewy_quiet = 0;
56static char be_semi_verbose = 0;
63static char *find_sym = NULL, *versioned_symname = NULL; 57static char *find_sym = NULL, *versioned_symname = NULL;
64static char *find_lib = NULL; 58static char *find_lib = NULL;
59static char *find_section = NULL;
65static char *out_format = NULL; 60static char *out_format = NULL;
66static char *search_path = NULL; 61static char *search_path = NULL;
62static char fix_elf = 0;
67static char gmatch = 0; 63static char g_match = 0;
64static char use_ldcache = 0;
68 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}
69 140
70/* sub-funcs for scanelf_file() */ 141/* sub-funcs for scanelf_file() */
71static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab) 142static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
72{ 143{
73 /* find the best SHT_DYNSYM and SHT_STRTAB sections */ 144 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
92 } \ 163 } \
93 } 164 }
94 GET_SYMTABS(32) 165 GET_SYMTABS(32)
95 GET_SYMTABS(64) 166 GET_SYMTABS(64)
96} 167}
168
97static char *scanelf_file_pax(elfobj *elf, char *found_pax) 169static char *scanelf_file_pax(elfobj *elf, char *found_pax)
98{ 170{
99 static char ret[7]; 171 static char ret[7];
100 unsigned long i, shown; 172 unsigned long i, shown;
101 173
110 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 182 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
111 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 183 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
112 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 184 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
113 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \ 185 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
114 continue; \ 186 continue; \
115 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))) \
116 continue; \ 192 continue; \
117 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); \
118 *found_pax = 1; \ 194 *found_pax = 1; \
119 ++shown; \ 195 ++shown; \
120 break; \ 196 break; \
121 } \ 197 } \
122 } 198 }
123 SHOW_PAX(32) 199 SHOW_PAX(32)
124 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 }
125 } 213 }
126 214
127 /* fall back to EI_PAX if no PT_PAX was found */ 215 /* fall back to EI_PAX if no PT_PAX was found */
128 if (!*ret) { 216 if (!*ret) {
129 static char *paxflags; 217 static char *paxflags;
143 231
144static 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)
145{ 233{
146 static char ret[12]; 234 static char ret[12];
147 char *found; 235 char *found;
148 unsigned long i, shown;
149 unsigned char multi_stack, multi_relro, multi_load; 236 unsigned long i, shown, multi_stack, multi_relro, multi_load;
237 int max_pt_load;
150 238
151 if (!show_phdr) return NULL; 239 if (!show_phdr) return NULL;
152 240
153 memcpy(ret, "--- --- ---\0", 12); 241 memcpy(ret, "--- --- ---\0", 12);
154 242
155 shown = 0; 243 shown = 0;
156 multi_stack = multi_relro = multi_load = 0; 244 multi_stack = multi_relro = multi_load = 0;
245 max_pt_load = elf_max_pt_load(elf);
157 246
247#define NOTE_GNU_STACK ".note.GNU-stack"
158#define SHOW_PHDR(B) \ 248#define SHOW_PHDR(B) \
159 if (elf->elf_class == ELFCLASS ## B) { \ 249 if (elf->elf_class == ELFCLASS ## B) { \
160 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 250 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
161 Elf ## B ## _Off offset; \ 251 Elf ## B ## _Off offset; \
162 uint32_t flags, check_flags; \ 252 uint32_t flags, check_flags; \
163 if (elf->phdr != NULL) { \ 253 if (elf->phdr != NULL) { \
164 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 254 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
165 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \ 255 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
166 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \ 256 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
257 if (multi_stack++) \
167 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; \
168 found = found_phdr; \ 261 found = found_phdr; \
169 offset = 0; \ 262 offset = 0; \
170 check_flags = PF_X; \ 263 check_flags = PF_X; \
171 } 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++) \
172 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \ 266 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
173 found = found_relro; \ 267 found = found_relro; \
174 offset = 4; \ 268 offset = 4; \
175 check_flags = PF_X; \ 269 check_flags = PF_X; \
176 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \ 270 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
177 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; \
178 found = found_load; \ 276 found = found_load; \
179 offset = 8; \ 277 offset = 8; \
180 check_flags = PF_W|PF_X; \ 278 check_flags = PF_W|PF_X; \
181 } else \ 279 } else \
182 continue; \ 280 continue; \
183 flags = EGET(phdr[i].p_flags); \ 281 flags = EGET(phdr[i].p_flags); \
184 if (be_quiet && ((flags & check_flags) != check_flags)) \ 282 if (be_quiet && ((flags & check_flags) != check_flags)) \
185 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 } \
186 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \ 289 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
187 *found = 1; \ 290 *found = 1; \
188 ++shown; \ 291 ++shown; \
189 } \ 292 } \
190 } else if (elf->shdr != NULL) { \ 293 } else if (elf->shdr != NULL) { \
191 /* no program headers which means this is prob an object file */ \ 294 /* no program headers which means this is prob an object file */ \
192 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \ 295 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
193 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; \
194 check_flags = SHF_WRITE|SHF_EXECINSTR; \ 300 check_flags = SHF_WRITE|SHF_EXECINSTR; \
195 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \ 301 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
196 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \ 302 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
197 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \ 303 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
198 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)) { \
199 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); \
200 flags = EGET(shdr[i].sh_flags); \ 308 flags = EGET(shdr[i].sh_flags); \
201 if (be_quiet && ((flags & check_flags) != check_flags)) \ 309 if (be_quiet && ((flags & check_flags) != check_flags)) \
202 continue; \ 310 continue; \
203 ++*found_phdr; \ 311 ++*found_phdr; \
207 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \ 315 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
208 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \ 316 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
209 break; \ 317 break; \
210 } \ 318 } \
211 } \ 319 } \
320 skip_this_shdr##B: \
212 if (!multi_stack) { \ 321 if (!multi_stack) { \
322 if (file_matches_list(elf->filename, qa_execstack)) \
323 return NULL; \
213 *found_phdr = 1; \ 324 *found_phdr = 1; \
214 shown = 1; \ 325 shown = 1; \
215 memcpy(ret, "!WX", 3); \ 326 memcpy(ret, "!WX", 3); \
216 } \ 327 } \
217 } \ 328 } \
222 if (be_wewy_wewy_quiet || (be_quiet && !shown)) 333 if (be_wewy_wewy_quiet || (be_quiet && !shown))
223 return NULL; 334 return NULL;
224 else 335 else
225 return ret; 336 return ret;
226} 337}
338
339/*
340 * See if this ELF contains a DT_TEXTREL tag in any of its
341 * PT_DYNAMIC sections.
342 */
227static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 343static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
228{ 344{
229 static const char *ret = "TEXTREL"; 345 static const char *ret = "TEXTREL";
230 unsigned long i; 346 unsigned long i;
231 347
232 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;
233 351
234 if (elf->phdr) { 352 if (elf->phdr) {
235#define SHOW_TEXTREL(B) \ 353#define SHOW_TEXTREL(B) \
236 if (elf->elf_class == ELFCLASS ## B) { \ 354 if (elf->elf_class == ELFCLASS ## B) { \
237 Elf ## B ## _Dyn *dyn; \ 355 Elf ## B ## _Dyn *dyn; \
238 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 356 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
239 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 357 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
240 Elf ## B ## _Off offset; \ 358 Elf ## B ## _Off offset; \
241 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 359 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
242 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; \
243 offset = EGET(phdr[i].p_offset); \ 361 offset = EGET(phdr[i].p_offset); \
244 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 362 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
245 dyn = DYN ## B (elf->data + offset); \ 363 dyn = DYN ## B (elf->data + offset); \
246 while (EGET(dyn->d_tag) != DT_NULL) { \ 364 while (EGET(dyn->d_tag) != DT_NULL) { \
247 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)*/ \
259 if (be_quiet || be_wewy_wewy_quiet) 377 if (be_quiet || be_wewy_wewy_quiet)
260 return NULL; 378 return NULL;
261 else 379 else
262 return " - "; 380 return " - ";
263} 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 */
264static 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)
265{ 389{
266 unsigned long s, r, rmax; 390 unsigned long s, r, rmax;
267 void *symtab_void, *strtab_void, *text_void; 391 void *symtab_void, *strtab_void, *text_void;
268 392
320 if (be_verbose <= 2) continue; \ 444 if (be_verbose <= 2) continue; \
321 } else \ 445 } else \
322 *found_textrels = 1; \ 446 *found_textrels = 1; \
323 /* locate this relocation symbol name */ \ 447 /* locate this relocation symbol name */ \
324 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 } \
325 sym_max = ELF ## B ## _R_SYM(r_info); \ 453 sym_max = ELF ## B ## _R_SYM(r_info); \
326 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \ 454 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
327 sym += sym_max; \ 455 sym += sym_max; \
328 else \ 456 else \
329 sym = NULL; \ 457 sym = NULL; \
331 /* show the raw details about this reloc */ \ 459 /* show the raw details about this reloc */ \
332 printf(" %s: ", elf->base_filename); \ 460 printf(" %s: ", elf->base_filename); \
333 if (sym && sym->st_name) \ 461 if (sym && sym->st_name) \
334 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))); \
335 else \ 463 else \
336 printf("(memory/fake?)"); \ 464 printf("(memory/data?)"); \
337 printf(" [0x%lX]", (unsigned long)r_offset); \ 465 printf(" [0x%lX]", (unsigned long)r_offset); \
338 /* 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 */ \
339 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 467 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
340 func = NULL; \ 468 func = NULL; \
341 offset_tmp = 0; \ 469 offset_tmp = 0; \
345 offset_tmp = EGET(sym->st_value); \ 473 offset_tmp = EGET(sym->st_value); \
346 } \ 474 } \
347 ++sym; \ 475 ++sym; \
348 } \ 476 } \
349 printf(" in "); \ 477 printf(" in "); \
350 if (func && func->st_name) \ 478 if (func && func->st_name) { \
351 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); \
352 else \ 482 else \
353 printf("(NULL: fake?)"); \ 483 printf("%s", func_name); \
484 } else \
485 printf("(optimized out)"); \
354 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 } \
355 } \ 507 } \
356 } } 508 } }
357 SHOW_TEXTRELS(32) 509 SHOW_TEXTRELS(32)
358 SHOW_TEXTRELS(64) 510 SHOW_TEXTRELS(64)
359 } 511 }
361 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);
362 514
363 return NULL; 515 return NULL;
364} 516}
365 517
366static void rpath_security_checks(elfobj *, char *); 518static void rpath_security_checks(elfobj *, char *, const char *);
367static void rpath_security_checks(elfobj *elf, char *item) { 519static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
520{
368 struct stat st; 521 struct stat st;
369 switch (*item) { 522 switch (*item) {
370 case '/': break; 523 case '/': break;
371 case '.': 524 case '.':
372 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);
373 break; 526 break;
527 case ':':
374 case '\0': 528 case '\0':
375 warnf("Security problem NULL RPATH in %s", elf->filename); 529 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
376 break; 530 break;
377 case '$': 531 case '$':
378 if (fstat(elf->fd, &st) != -1) 532 if (fstat(elf->fd, &st) != -1)
379 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID)) 533 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
380 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",
381 item, elf->filename, st.st_mode & 07777); 535 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
382 break; 536 break;
383 default: 537 default:
384 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);
385 break; 539 break;
386 } 540 }
387} 541}
388static 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)
389{ 543{
406 Elf ## B ## _Off offset; \ 560 Elf ## B ## _Off offset; \
407 Elf ## B ## _Xword word; \ 561 Elf ## B ## _Xword word; \
408 /* Scan all the program headers */ \ 562 /* Scan all the program headers */ \
409 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 563 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
410 /* Just scan dynamic headers */ \ 564 /* Just scan dynamic headers */ \
411 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; \
412 offset = EGET(phdr[i].p_offset); \ 566 offset = EGET(phdr[i].p_offset); \
413 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 567 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
414 /* Just scan dynamic RPATH/RUNPATH headers */ \ 568 /* Just scan dynamic RPATH/RUNPATH headers */ \
415 dyn = DYN ## B (elf->data + offset); \ 569 dyn = DYN ## B (elf->data + offset); \
416 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \ 570 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
425 /* Verify the memory is somewhat sane */ \ 579 /* Verify the memory is somewhat sane */ \
426 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 580 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
427 if (offset < (Elf ## B ## _Off)elf->len) { \ 581 if (offset < (Elf ## B ## _Off)elf->len) { \
428 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \ 582 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
429 *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); \
430 /* If quiet, don't output paths in ld.so.conf */ \ 587 /* If quiet, don't output paths in ld.so.conf */ \
431 if (be_quiet) { \ 588 if (be_quiet) { \
432 size_t len; \ 589 size_t len; \
433 char *start, *end; \ 590 char *start, *end; \
434 /* note that we only 'chop' off leading known paths. */ \ 591 /* note that we only 'chop' off leading known paths. */ \
435 /* 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. */ \
436 start = *r; \ 593 start = *r; \
437 /* scan each path in : delimited list */ \ 594 /* scan each path in : delimited list */ \
438 while (start) { \ 595 while (start) { \
439 rpath_security_checks(elf, start); \ 596 rpath_security_checks(elf, start, get_elfdtype(word)); \
440 end = strchr(start, ':'); \ 597 end = strchr(start, ':'); \
441 len = (end ? abs(end - start) : strlen(start)); \ 598 len = (end ? abs(end - start) : strlen(start)); \
599 if (use_ldcache) \
442 for (s = 0; ldpaths[s]; ++s) { \ 600 for (s = 0; ldpaths[s]; ++s) \
443 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \ 601 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
444 *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)++; \
445 break; \ 607 break; \
446 } \ 608 } \
447 } \
448 if (!*r || !ldpaths[s] || !end) \ 609 if (!*r || !end) \
449 start = NULL; \ 610 break; \
450 else \ 611 else \
451 start = start + len + 1; \ 612 start = start + len + 1; \
452 } \ 613 } \
453 } \ 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) \
454 if (*r) *found_rpath = 1; \ 655 *found_rpath = 1; \
656 } \
455 } \ 657 } \
456 ++dyn; \ 658 ++dyn; \
457 } \ 659 } \
458 } } 660 } }
459 SHOW_RPATH(32) 661 SHOW_RPATH(32)
476 } else if (rpath || runpath) 678 } else if (rpath || runpath)
477 xstrcat(ret, (runpath ? runpath : rpath), ret_len); 679 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
478 else if (!be_quiet) 680 else if (!be_quiet)
479 xstrcat(ret, " - ", ret_len); 681 xstrcat(ret, " - ", ret_len);
480} 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
481static 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)
482{ 806{
483 unsigned long i; 807 unsigned long i;
484 char *needed; 808 char *needed;
485 void *strtbl_void; 809 void *strtbl_void;
810 char *p;
486 811
487 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL; 812 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
488 813
489 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 814 strtbl_void = elf_findsecbyname(elf, ".dynstr");
490 815
495 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 820 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
496 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 821 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
497 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 822 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
498 Elf ## B ## _Off offset; \ 823 Elf ## B ## _Off offset; \
499 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 824 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
500 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; \
501 offset = EGET(phdr[i].p_offset); \ 826 offset = EGET(phdr[i].p_offset); \
502 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 827 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
503 dyn = DYN ## B (elf->data + offset); \ 828 dyn = DYN ## B (elf->data + offset); \
504 while (EGET(dyn->d_tag) != DT_NULL) { \ 829 while (EGET(dyn->d_tag) != DT_NULL) { \
505 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 830 if (EGET(dyn->d_tag) == DT_NEEDED) { \
510 } \ 835 } \
511 needed = (char*)(elf->data + offset); \ 836 needed = (char*)(elf->data + offset); \
512 if (op == 0) { \ 837 if (op == 0) { \
513 if (!be_wewy_wewy_quiet) { \ 838 if (!be_wewy_wewy_quiet) { \
514 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; \
515 xstrcat(ret, needed, ret_len); \ 843 xstrcat(ret, needed, ret_len); \
516 } \ 844 } \
517 *found_needed = 1; \ 845 *found_needed = 1; \
518 } else { \ 846 } else { \
519 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \ 847 if (!strncmp(find_lib, needed, strlen( !g_match ? needed : find_lib))) { \
520 *found_lib = 1; \ 848 *found_lib = 1; \
521 return (be_wewy_wewy_quiet ? NULL : needed); \ 849 return (be_wewy_wewy_quiet ? NULL : needed); \
522 } \ 850 } \
523 } \ 851 } \
524 } \ 852 } \
555} 883}
556static char *scanelf_file_bind(elfobj *elf, char *found_bind) 884static char *scanelf_file_bind(elfobj *elf, char *found_bind)
557{ 885{
558 unsigned long i; 886 unsigned long i;
559 struct stat s; 887 struct stat s;
888 char dynamic = 0;
560 889
561 if (!show_bind) return NULL; 890 if (!show_bind) return NULL;
562 if (!elf->phdr) return NULL; 891 if (!elf->phdr) return NULL;
563 892
564#define SHOW_BIND(B) \ 893#define SHOW_BIND(B) \
566 Elf ## B ## _Dyn *dyn; \ 895 Elf ## B ## _Dyn *dyn; \
567 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 896 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
568 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 897 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
569 Elf ## B ## _Off offset; \ 898 Elf ## B ## _Off offset; \
570 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 899 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
571 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; \
572 offset = EGET(phdr[i].p_offset); \ 902 offset = EGET(phdr[i].p_offset); \
573 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 903 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
574 dyn = DYN ## B (elf->data + offset); \ 904 dyn = DYN ## B (elf->data + offset); \
575 while (EGET(dyn->d_tag) != DT_NULL) { \ 905 while (EGET(dyn->d_tag) != DT_NULL) { \
576 if (EGET(dyn->d_tag) == DT_BIND_NOW || \ 906 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
587 SHOW_BIND(32) 917 SHOW_BIND(32)
588 SHOW_BIND(64) 918 SHOW_BIND(64)
589 919
590 if (be_wewy_wewy_quiet) return NULL; 920 if (be_wewy_wewy_quiet) return NULL;
591 921
922 /* don't output anything if quiet mode and the ELF is static or not setuid */
592 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))))) {
593 return NULL; 924 return NULL;
594 } else { 925 } else {
595 *found_bind = 1; 926 *found_bind = 1;
596 return (char *) "LAZY"; 927 return (char *) (dynamic ? "LAZY" : "STATIC");
597 } 928 }
598} 929}
599static char *scanelf_file_soname(elfobj *elf, char *found_soname) 930static char *scanelf_file_soname(elfobj *elf, char *found_soname)
600{ 931{
601 unsigned long i; 932 unsigned long i;
613 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 944 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
614 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 945 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
615 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 946 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
616 Elf ## B ## _Off offset; \ 947 Elf ## B ## _Off offset; \
617 /* only look for soname in shared objects */ \ 948 /* only look for soname in shared objects */ \
618 if (ehdr->e_type != ET_DYN) \ 949 if (EGET(ehdr->e_type) != ET_DYN) \
619 return NULL; \ 950 return NULL; \
620 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 951 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
621 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; \
622 offset = EGET(phdr[i].p_offset); \ 953 offset = EGET(phdr[i].p_offset); \
623 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 954 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
624 dyn = DYN ## B (elf->data + offset); \ 955 dyn = DYN ## B (elf->data + offset); \
625 while (EGET(dyn->d_tag) != DT_NULL) { \ 956 while (EGET(dyn->d_tag) != DT_NULL) { \
626 if (EGET(dyn->d_tag) == DT_SONAME) { \ 957 if (EGET(dyn->d_tag) == DT_SONAME) { \
640 SHOW_SONAME(64) 971 SHOW_SONAME(64)
641 } 972 }
642 973
643 return NULL; 974 return NULL;
644} 975}
976
645static char *scanelf_file_sym(elfobj *elf, char *found_sym) 977static char *scanelf_file_sym(elfobj *elf, char *found_sym)
646{ 978{
647 unsigned long i; 979 unsigned long i;
980 char *ret;
648 void *symtab_void, *strtab_void; 981 void *symtab_void, *strtab_void;
649 982
650 if (!find_sym) return NULL; 983 if (!find_sym) return NULL;
984 ret = find_sym;
651 985
652 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void); 986 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
653 987
654 if (symtab_void && strtab_void) { 988 if (symtab_void && strtab_void) {
655#define FIND_SYM(B) \ 989#define FIND_SYM(B) \
656 if (elf->elf_class == ELFCLASS ## B) { \ 990 if (elf->elf_class == ELFCLASS ## B) { \
657 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 991 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
658 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 992 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
659 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)); \
660 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 994 unsigned long cnt = EGET(symtab->sh_entsize); \
661 char *symname; \ 995 char *symname; \
996 if (cnt) \
997 cnt = EGET(symtab->sh_size) / cnt; \
662 for (i = 0; i < cnt; ++i) { \ 998 for (i = 0; i < cnt; ++i) { \
663 if (sym->st_name) { \ 999 if (sym->st_name) { \
1000 /* make sure the symbol name is in acceptable memory range */ \
664 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)); \
665 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 == '*') { \
666 printf("%s(%s) %5lX %15s %s\n", \ 1009 printf("%s(%s) %5lX %15s %s %s\n", \
667 ((*found_sym == 0) ? "\n\t" : "\t"), \ 1010 ((*found_sym == 0) ? "\n\t" : "\t"), \
668 elf->base_filename, \ 1011 elf->base_filename, \
669 (long)sym->st_size, \ 1012 (unsigned long)sym->st_size, \
670 (char *)get_elfstttype(sym->st_info), \ 1013 get_elfstttype(sym->st_info), \
671 symname); \ 1014 sym->st_shndx == SHN_UNDEF ? "U" : "D", symname); \
672 *found_sym = 1; \ 1015 *found_sym = 1; \
673 } else if ((strcmp(find_sym, symname) == 0) || \ 1016 } else { \
674 (strcmp(symname, versioned_symname) == 0)) \ 1017 /* allow the user to specify a comma delimited list of symbols to search for */ \
1018 char *this_sym, *this_sym_ver, *next_sym; \
1019 this_sym = ret; \
1020 this_sym_ver = versioned_symname; \
1021 do { \
1022 next_sym = strchr(this_sym, ','); \
1023 if (next_sym == NULL) \
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 */ \
1039 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\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 \
1047 ret = this_sym; \
675 (*found_sym)++; \ 1048 (*found_sym)++; \
1049 goto break_out; \
1050 } \
1051 skip_this_sym##B: this_sym = next_sym + 1; \
1052 } while (*next_sym != '\0'); \
1053 } \
676 } \ 1054 } \
677 ++sym; \ 1055 ++sym; \
678 } } 1056 } }
679 FIND_SYM(32) 1057 FIND_SYM(32)
680 FIND_SYM(64) 1058 FIND_SYM(64)
681 } 1059 }
682 1060
1061break_out:
683 if (be_wewy_wewy_quiet) return NULL; 1062 if (be_wewy_wewy_quiet) return NULL;
684 1063
685 if (*find_sym != '*' && *found_sym) 1064 if (*find_sym != '*' && *found_sym)
686 return find_sym; 1065 return ret;
687 if (be_quiet) 1066 if (be_quiet)
688 return NULL; 1067 return NULL;
689 else 1068 else
690 return (char *)" - "; 1069 return (char *)" - ";
691} 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
692/* scan an elf file and show all the fun stuff */ 1102/* scan an elf file and show all the fun stuff */
693#define prints(str) write(fileno(stdout), str, strlen(str)) 1103#define prints(str) write(fileno(stdout), str, strlen(str))
694static void scanelf_file(const char *filename) 1104static int scanelf_elfobj(elfobj *elf)
695{ 1105{
696 unsigned long i; 1106 unsigned long i;
697 char found_pax, found_phdr, found_relro, found_load, found_textrel, 1107 char found_pax, found_phdr, found_relro, found_load, found_textrel,
698 found_rpath, found_needed, found_interp, found_bind, found_soname, 1108 found_rpath, found_needed, found_interp, found_bind, found_soname,
699 found_sym, found_lib, found_file, found_textrels; 1109 found_sym, found_lib, found_file, found_textrels, found_section;
700 elfobj *elf;
701 struct stat st;
702 static char *out_buffer = NULL; 1110 static char *out_buffer = NULL;
703 static size_t out_len; 1111 static size_t out_len;
704 1112
705 /* make sure 'filename' exists */
706 if (lstat(filename, &st) == -1) {
707 if (be_verbose > 2) printf("%s: does not exist\n", filename);
708 return;
709 }
710 /* always handle regular files and handle symlinked files if no -y */
711 if (S_ISLNK(st.st_mode)) {
712 if (!scan_symlink) return;
713 stat(filename, &st);
714 }
715 if (!S_ISREG(st.st_mode)) {
716 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
717 return;
718 }
719
720 found_pax = found_phdr = found_relro = found_load = found_textrel = \ 1113 found_pax = found_phdr = found_relro = found_load = found_textrel = \
721 found_rpath = found_needed = found_interp = found_bind = found_soname = \ 1114 found_rpath = found_needed = found_interp = found_bind = found_soname = \
722 found_sym = found_lib = found_file = found_textrels = 0; 1115 found_sym = found_lib = found_file = found_textrels = found_section = 0;
723 1116
724 /* verify this is real ELF */
725 if ((elf = readelf(filename)) == NULL) {
726 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
727 return;
728 }
729
730 if (be_verbose > 1) 1117 if (be_verbose > 2)
731 printf("%s: scanning file {%s,%s}\n", filename, 1118 printf("%s: scanning file {%s,%s}\n", elf->filename,
732 get_elfeitype(EI_CLASS, elf->elf_class), 1119 get_elfeitype(EI_CLASS, elf->elf_class),
733 get_elfeitype(EI_DATA, elf->data[EI_DATA])); 1120 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
734 else if (be_verbose) 1121 else if (be_verbose > 1)
735 printf("%s: scanning file\n", filename); 1122 printf("%s: scanning file\n", elf->filename);
736 1123
737 /* init output buffer */ 1124 /* init output buffer */
738 if (!out_buffer) { 1125 if (!out_buffer) {
739 out_len = sizeof(char) * 80; 1126 out_len = sizeof(char) * 80;
740 out_buffer = (char*)xmalloc(out_len); 1127 out_buffer = xmalloc(out_len);
741 } 1128 }
742 *out_buffer = '\0'; 1129 *out_buffer = '\0';
743 1130
744 /* show the header */ 1131 /* show the header */
745 if (!be_quiet && show_banner) { 1132 if (!be_quiet && show_banner) {
746 for (i = 0; out_format[i]; ++i) { 1133 for (i = 0; out_format[i]; ++i) {
747 if (!IS_MODIFIER(out_format[i])) continue; 1134 if (!IS_MODIFIER(out_format[i])) continue;
748 1135
749 switch (out_format[++i]) { 1136 switch (out_format[++i]) {
1137 case '+': break;
750 case '%': break; 1138 case '%': break;
751 case '#': break; 1139 case '#': break;
752 case 'F': 1140 case 'F':
753 case 'p': 1141 case 'p':
754 case 'f': prints("FILE "); found_file = 1; break; 1142 case 'f': prints("FILE "); found_file = 1; break;
755 case 'o': prints(" TYPE "); break; 1143 case 'o': prints(" TYPE "); break;
756 case 'x': prints(" PAX "); break; 1144 case 'x': prints(" PAX "); break;
757 case 'e': prints("STK/REL/PTL "); break; 1145 case 'e': prints("STK/REL/PTL "); break;
758 case 't': prints("TEXTREL "); break; 1146 case 't': prints("TEXTREL "); break;
759 case 'r': prints("RPATH "); break; 1147 case 'r': prints("RPATH "); break;
1148 case 'M': prints("CLASS "); break;
760 case 'n': prints("NEEDED "); break; 1149 case 'n': prints("NEEDED "); break;
761 case 'i': prints("INTERP "); break; 1150 case 'i': prints("INTERP "); break;
762 case 'b': prints("BIND "); break; 1151 case 'b': prints("BIND "); break;
763 case 'S': prints("SONAME "); break; 1152 case 'S': prints("SONAME "); break;
764 case 's': prints("SYM "); break; 1153 case 's': prints("SYM "); break;
765 case 'N': prints("LIB "); break; 1154 case 'N': prints("LIB "); break;
766 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;
767 default: warnf("'%c' has no title ?", out_format[i]); 1160 default: warnf("'%c' has no title ?", out_format[i]);
768 } 1161 }
769 } 1162 }
770 if (!found_file) prints("FILE "); 1163 if (!found_file) prints("FILE ");
771 prints("\n"); 1164 prints("\n");
776 /* dump all the good stuff */ 1169 /* dump all the good stuff */
777 for (i = 0; out_format[i]; ++i) { 1170 for (i = 0; out_format[i]; ++i) {
778 const char *out; 1171 const char *out;
779 const char *tmp; 1172 const char *tmp;
780 1173
781 /* make sure we trim leading spaces in quiet mode */
782 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
783 *out_buffer = '\0';
784
785 if (!IS_MODIFIER(out_format[i])) { 1174 if (!IS_MODIFIER(out_format[i])) {
786 xchrcat(&out_buffer, out_format[i], &out_len); 1175 xchrcat(&out_buffer, out_format[i], &out_len);
787 continue; 1176 continue;
788 } 1177 }
789 1178
790 out = NULL; 1179 out = NULL;
791 be_wewy_wewy_quiet = (out_format[i] == '#'); 1180 be_wewy_wewy_quiet = (out_format[i] == '#');
1181 be_semi_verbose = (out_format[i] == '+');
792 switch (out_format[++i]) { 1182 switch (out_format[++i]) {
1183 case '+':
793 case '%': 1184 case '%':
794 case '#': 1185 case '#':
795 xchrcat(&out_buffer, out_format[i], &out_len); break; 1186 xchrcat(&out_buffer, out_format[i], &out_len); break;
796 case 'F': 1187 case 'F':
797 found_file = 1; 1188 found_file = 1;
798 if (be_wewy_wewy_quiet) break; 1189 if (be_wewy_wewy_quiet) break;
799 xstrcat(&out_buffer, filename, &out_len); 1190 xstrcat(&out_buffer, elf->filename, &out_len);
800 break; 1191 break;
801 case 'p': 1192 case 'p':
802 found_file = 1; 1193 found_file = 1;
803 if (be_wewy_wewy_quiet) break; 1194 if (be_wewy_wewy_quiet) break;
804 tmp = filename; 1195 tmp = elf->filename;
805 if (search_path) { 1196 if (search_path) {
806 ssize_t len_search = strlen(search_path); 1197 ssize_t len_search = strlen(search_path);
807 ssize_t len_file = strlen(filename); 1198 ssize_t len_file = strlen(elf->filename);
808 if (!strncmp(filename, search_path, len_search) && \ 1199 if (!strncmp(elf->filename, search_path, len_search) && \
809 len_file > len_search) 1200 len_file > len_search)
810 tmp += len_search; 1201 tmp += len_search;
811 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++; 1202 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
812 } 1203 }
813 xstrcat(&out_buffer, tmp, &out_len); 1204 xstrcat(&out_buffer, tmp, &out_len);
814 break; 1205 break;
815 case 'f': 1206 case 'f':
816 found_file = 1; 1207 found_file = 1;
817 if (be_wewy_wewy_quiet) break; 1208 if (be_wewy_wewy_quiet) break;
818 tmp = strrchr(filename, '/'); 1209 tmp = strrchr(elf->filename, '/');
819 tmp = (tmp == NULL ? filename : tmp+1); 1210 tmp = (tmp == NULL ? elf->filename : tmp+1);
820 xstrcat(&out_buffer, tmp, &out_len); 1211 xstrcat(&out_buffer, tmp, &out_len);
821 break; 1212 break;
822 case 'o': out = get_elfetype(elf); break; 1213 case 'o': out = get_elfetype(elf); break;
823 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1214 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
824 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;
825 case 't': out = scanelf_file_textrel(elf, &found_textrel); break; 1216 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
826 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;
827 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;
828 case 'n': 1222 case 'n':
829 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;
830 case 'i': out = scanelf_file_interp(elf, &found_interp); break; 1224 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
831 case 'b': out = scanelf_file_bind(elf, &found_bind); break; 1225 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
832 case 'S': out = scanelf_file_soname(elf, &found_soname); break; 1226 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
833 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;
834 default: warnf("'%c' has no scan code?", out_format[i]); 1230 default: warnf("'%c' has no scan code?", out_format[i]);
835 } 1231 }
1232 if (out) {
1233 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
1234 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
1235 xstrncat(&out_buffer, out, &out_len, (tmp-out));
1236 else
836 if (out) xstrcat(&out_buffer, out, &out_len); 1237 xstrcat(&out_buffer, out, &out_len);
1238 }
837 } 1239 }
838 1240
839#define FOUND_SOMETHING() \ 1241#define FOUND_SOMETHING() \
840 (found_pax || found_phdr || found_relro || found_load || found_textrel || \ 1242 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
841 found_rpath || found_needed || found_interp || found_bind || \ 1243 found_rpath || found_needed || found_interp || found_bind || \
842 found_soname || found_sym || found_lib || found_textrels) 1244 found_soname || found_sym || found_lib || found_textrels || found_section )
843 1245
844 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) { 1246 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
845 xchrcat(&out_buffer, ' ', &out_len); 1247 xchrcat(&out_buffer, ' ', &out_len);
846 xstrcat(&out_buffer, filename, &out_len); 1248 xstrcat(&out_buffer, elf->filename, &out_len);
847 } 1249 }
848 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) { 1250 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
849 puts(out_buffer); 1251 puts(out_buffer);
850 fflush(stdout); 1252 fflush(stdout);
851 } 1253 }
852 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:
853 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;
854} 1359}
855 1360
856/* 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 */
857static void scanelf_dir(const char *path) 1362static int scanelf_dir(const char *path)
858{ 1363{
859 register DIR *dir; 1364 register DIR *dir;
860 register struct dirent *dentry; 1365 register struct dirent *dentry;
861 struct stat st_top, st; 1366 struct stat st_top, st;
862 char buf[_POSIX_PATH_MAX]; 1367 char buf[__PAX_UTILS_PATH_MAX];
863 size_t pathlen = 0, len = 0; 1368 size_t pathlen = 0, len = 0;
1369 int ret = 0;
864 1370
865 /* make sure path exists */ 1371 /* make sure path exists */
866 if (lstat(path, &st_top) == -1) { 1372 if (lstat(path, &st_top) == -1) {
867 if (be_verbose > 2) printf("%s: does not exist\n", path); 1373 if (be_verbose > 2) printf("%s: does not exist\n", path);
868 return; 1374 return 1;
869 } 1375 }
870 1376
871 /* 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 */
872 if (!S_ISDIR(st_top.st_mode)) { 1378 if (!S_ISDIR(st_top.st_mode)) {
873 scanelf_file(path); 1379 return scanelf_file(path, &st_top);
874 return;
875 } 1380 }
876 1381
877 /* now scan the dir looking for fun stuff */ 1382 /* now scan the dir looking for fun stuff */
878 if ((dir = opendir(path)) == NULL) { 1383 if ((dir = opendir(path)) == NULL) {
879 warnf("could not opendir %s: %s", path, strerror(errno)); 1384 warnf("could not opendir %s: %s", path, strerror(errno));
880 return; 1385 return 1;
881 } 1386 }
882 if (be_verbose) printf("%s: scanning dir\n", path); 1387 if (be_verbose > 1) printf("%s: scanning dir\n", path);
883 1388
884 pathlen = strlen(path); 1389 pathlen = strlen(path);
885 while ((dentry = readdir(dir))) { 1390 while ((dentry = readdir(dir))) {
886 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1391 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
887 continue; 1392 continue;
889 if (len >= sizeof(buf)) { 1394 if (len >= sizeof(buf)) {
890 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path, 1395 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
891 (unsigned long)len, (unsigned long)sizeof(buf)); 1396 (unsigned long)len, (unsigned long)sizeof(buf));
892 continue; 1397 continue;
893 } 1398 }
894 sprintf(buf, "%s/%s", path, dentry->d_name); 1399 snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name);
895 if (lstat(buf, &st) != -1) { 1400 if (lstat(buf, &st) != -1) {
896 if (S_ISREG(st.st_mode)) 1401 if (S_ISREG(st.st_mode))
897 scanelf_file(buf); 1402 ret = scanelf_file(buf, &st);
898 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1403 else if (dir_recurse && S_ISDIR(st.st_mode)) {
899 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1404 if (dir_crossmount || (st_top.st_dev == st.st_dev))
900 scanelf_dir(buf); 1405 ret = scanelf_dir(buf);
901 } 1406 }
902 } 1407 }
903 } 1408 }
904 closedir(dir); 1409 closedir(dir);
1410 return ret;
905} 1411}
906 1412
907static int scanelf_from_file(char *filename) 1413static int scanelf_from_file(const char *filename)
908{ 1414{
909 FILE *fp = NULL; 1415 FILE *fp = NULL;
910 char *p; 1416 char *p;
911 char path[_POSIX_PATH_MAX]; 1417 char path[__PAX_UTILS_PATH_MAX];
1418 int ret = 0;
912 1419
913 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL)) 1420 if (strcmp(filename, "-") == 0)
914 fp = stdin; 1421 fp = stdin;
915 else if ((fp = fopen(filename, "r")) == NULL) 1422 else if ((fp = fopen(filename, "r")) == NULL)
916 return 1; 1423 return 1;
917 1424
918 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1425 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
919 if ((p = strchr(path, '\n')) != NULL) 1426 if ((p = strchr(path, '\n')) != NULL)
920 *p = 0; 1427 *p = 0;
921 search_path = path; 1428 search_path = path;
922 scanelf_dir(path); 1429 ret = scanelf_dir(path);
923 } 1430 }
924 if (fp != stdin) 1431 if (fp != stdin)
925 fclose(fp); 1432 fclose(fp);
926 return 0; 1433 return ret;
927} 1434}
928 1435
929static 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)
930{ 1439{
931 FILE *fp = NULL; 1440 FILE *fp = NULL;
932 char *p; 1441 char *p;
933 char path[_POSIX_PATH_MAX]; 1442 char path[__PAX_UTILS_PATH_MAX];
934 int i = 0;
935 1443
936 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1444 if (i + 1 == ARRAY_SIZE(ldpaths))
937 return; 1445 return i;
938 1446
1447 if ((fp = fopen(fname, "r")) == NULL)
1448 return i;
1449
939 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1450 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
940 if (*path != '/')
941 continue;
942
943 if ((p = strrchr(path, '\r')) != NULL) 1451 if ((p = strrchr(path, '\r')) != NULL)
944 *p = 0; 1452 *p = 0;
945 if ((p = strchr(path, '\n')) != NULL) 1453 if ((p = strchr(path, '\n')) != NULL)
946 *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;
947 1487
948 ldpaths[i++] = xstrdup(path); 1488 ldpaths[i++] = xstrdup(path);
949 1489
950 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths)) 1490 if (i + 1 == ARRAY_SIZE(ldpaths))
951 break; 1491 break;
952 } 1492 }
953 ldpaths[i] = NULL; 1493 ldpaths[i] = NULL;
954 1494
955 fclose(fp); 1495 fclose(fp);
1496 return i;
956} 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
957 1551
958/* scan /etc/ld.so.conf for paths */ 1552/* scan /etc/ld.so.conf for paths */
959static void scanelf_ldpath() 1553static void scanelf_ldpath(void)
960{ 1554{
961 char scan_l, scan_ul, scan_ull; 1555 char scan_l, scan_ul, scan_ull;
962 int i = 0; 1556 int i = 0;
963 1557
964 if (!ldpaths[0]) 1558 if (!ldpaths[0])
978 if (!scan_ul) scanelf_dir("/usr/lib"); 1572 if (!scan_ul) scanelf_dir("/usr/lib");
979 if (!scan_ull) scanelf_dir("/usr/local/lib"); 1573 if (!scan_ull) scanelf_dir("/usr/local/lib");
980} 1574}
981 1575
982/* scan env PATH for paths */ 1576/* scan env PATH for paths */
983static void scanelf_envpath() 1577static void scanelf_envpath(void)
984{ 1578{
985 char *path, *p; 1579 char *path, *p;
986 1580
987 path = getenv("PATH"); 1581 path = getenv("PATH");
988 if (!path) 1582 if (!path)
996 1590
997 free(path); 1591 free(path);
998} 1592}
999 1593
1000 1594
1001 1595/* usage / invocation handling functions */ /* Free Flags: c d j u w C G H I J K P Q U W Y Z */
1002/* usage / invocation handling functions */
1003#define PARSE_FLAGS "plRmyxetrnibSs:gN:TaqvF:f:o:BhV" 1596#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DO:BhV"
1004#define a_argument required_argument 1597#define a_argument required_argument
1005static struct option const long_opts[] = { 1598static struct option const long_opts[] = {
1006 {"path", no_argument, NULL, 'p'}, 1599 {"path", no_argument, NULL, 'p'},
1007 {"ldpath", no_argument, NULL, 'l'}, 1600 {"ldpath", no_argument, NULL, 'l'},
1008 {"recursive", no_argument, NULL, 'R'}, 1601 {"recursive", no_argument, NULL, 'R'},
1009 {"mount", no_argument, NULL, 'm'}, 1602 {"mount", no_argument, NULL, 'm'},
1010 {"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'},
1011 {"pax", no_argument, NULL, 'x'}, 1608 {"pax", no_argument, NULL, 'x'},
1012 {"header", no_argument, NULL, 'e'}, 1609 {"header", no_argument, NULL, 'e'},
1013 {"textrel", no_argument, NULL, 't'}, 1610 {"textrel", no_argument, NULL, 't'},
1014 {"rpath", no_argument, NULL, 'r'}, 1611 {"rpath", no_argument, NULL, 'r'},
1015 {"needed", no_argument, NULL, 'n'}, 1612 {"needed", no_argument, NULL, 'n'},
1016 {"interp", no_argument, NULL, 'i'}, 1613 {"interp", no_argument, NULL, 'i'},
1017 {"bind", no_argument, NULL, 'b'}, 1614 {"bind", no_argument, NULL, 'b'},
1018 {"soname", no_argument, NULL, 'S'}, 1615 {"soname", no_argument, NULL, 'S'},
1019 {"symbol", a_argument, NULL, 's'}, 1616 {"symbol", a_argument, NULL, 's'},
1617 {"section", a_argument, NULL, 'k'},
1020 {"lib", a_argument, NULL, 'N'}, 1618 {"lib", a_argument, NULL, 'N'},
1021 {"gmatch", no_argument, NULL, 'g'}, 1619 {"gmatch", no_argument, NULL, 'g'},
1022 {"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'},
1023 {"all", no_argument, NULL, 'a'}, 1625 {"all", no_argument, NULL, 'a'},
1024 {"quiet", no_argument, NULL, 'q'}, 1626 {"quiet", no_argument, NULL, 'q'},
1025 {"verbose", no_argument, NULL, 'v'}, 1627 {"verbose", no_argument, NULL, 'v'},
1026 {"format", a_argument, NULL, 'F'}, 1628 {"format", a_argument, NULL, 'F'},
1027 {"from", a_argument, NULL, 'f'}, 1629 {"from", a_argument, NULL, 'f'},
1035static const char *opts_help[] = { 1637static const char *opts_help[] = {
1036 "Scan all directories in PATH environment", 1638 "Scan all directories in PATH environment",
1037 "Scan all directories in /etc/ld.so.conf", 1639 "Scan all directories in /etc/ld.so.conf",
1038 "Scan directories recursively", 1640 "Scan directories recursively",
1039 "Don't recursively cross mount points", 1641 "Don't recursively cross mount points",
1040 "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",
1041 "Print PaX markings", 1647 "Print PaX markings",
1042 "Print GNU_STACK/PT_LOAD markings", 1648 "Print GNU_STACK/PT_LOAD markings",
1043 "Print TEXTREL information", 1649 "Print TEXTREL information",
1044 "Print RPATH information", 1650 "Print RPATH information",
1045 "Print NEEDED information", 1651 "Print NEEDED information",
1046 "Print INTERP information", 1652 "Print INTERP information",
1047 "Print BIND information", 1653 "Print BIND information",
1048 "Print SONAME information", 1654 "Print SONAME information",
1049 "Find a specified symbol", 1655 "Find a specified symbol",
1656 "Find a specified section",
1050 "Find a specified library", 1657 "Find a specified library",
1051 "Use strncmp to match libraries. (use with -N)", 1658 "Use strncmp to match libraries. (use with -N)",
1052 "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",
1053 "Print all scanned info (-x -e -t -r -b)\n", 1664 "Print all scanned info (-x -e -t -r -b)\n",
1054 "Only output 'bad' things", 1665 "Only output 'bad' things",
1055 "Be verbose (can be specified more than once)", 1666 "Be verbose (can be specified more than once)",
1056 "Use specified format for output", 1667 "Use specified format for output",
1057 "Read input stream from a filename", 1668 "Read input stream from a filename",
1065/* display usage and exit */ 1676/* display usage and exit */
1066static void usage(int status) 1677static void usage(int status)
1067{ 1678{
1068 unsigned long i; 1679 unsigned long i;
1069 printf("* Scan ELF binaries for stuff\n\n" 1680 printf("* Scan ELF binaries for stuff\n\n"
1070 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0); 1681 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1071 printf("Options: -[%s]\n", PARSE_FLAGS); 1682 printf("Options: -[%s]\n", PARSE_FLAGS);
1072 for (i = 0; long_opts[i].name; ++i) 1683 for (i = 0; long_opts[i].name; ++i)
1073 if (long_opts[i].has_arg == no_argument) 1684 if (long_opts[i].has_arg == no_argument)
1074 printf(" -%c, --%-13s* %s\n", long_opts[i].val, 1685 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
1075 long_opts[i].name, opts_help[i]); 1686 long_opts[i].name, opts_help[i]);
1076 else 1687 else
1077 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val, 1688 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
1078 long_opts[i].name, opts_help[i]); 1689 long_opts[i].name, opts_help[i]);
1079 1690
1080 if (status != EXIT_SUCCESS) 1691 puts("\nFor more information, see the scanelf(1) manpage");
1081 exit(status);
1082
1083 puts("\nThe format modifiers for the -F option are:");
1084 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1085 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1086 puts(" i INTERP \tb BIND \ts symbol");
1087 puts(" N library \to Type \tT TEXTRELs");
1088 puts(" S SONAME");
1089 puts(" p filename (with search path removed)");
1090 puts(" f filename (short name/basename)");
1091 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1092
1093 exit(status); 1692 exit(status);
1094} 1693}
1095 1694
1096/* 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 }
1097static void parseargs(int argc, char *argv[]) 1704static int parseargs(int argc, char *argv[])
1098{ 1705{
1099 int i; 1706 int i;
1100 char *from_file = NULL; 1707 const char *from_file = NULL;
1708 int ret = 0;
1101 1709
1102 opterr = 0; 1710 opterr = 0;
1103 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) {
1104 switch (i) { 1712 switch (i) {
1105 1713
1109 VERSION, __FILE__, __DATE__, rcsid, argv0); 1717 VERSION, __FILE__, __DATE__, rcsid, argv0);
1110 exit(EXIT_SUCCESS); 1718 exit(EXIT_SUCCESS);
1111 break; 1719 break;
1112 case 'h': usage(EXIT_SUCCESS); break; 1720 case 'h': usage(EXIT_SUCCESS); break;
1113 case 'f': 1721 case 'f':
1114 if (from_file) err("Don't specify -f twice"); 1722 if (from_file) warn("You prob don't want to specify -f twice");
1115 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;
1116 break; 1740 break;
1117 case 'o': { 1741 case 'o': {
1118 FILE *fp = NULL;
1119 if ((fp = freopen(optarg, "w", stdout)) == NULL) 1742 if (freopen(optarg, "w", stdout) == NULL)
1120 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 1743 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1121 SET_STDOUT(fp);
1122 break; 1744 break;
1123 } 1745 }
1124 1746 case 'k':
1747 if (find_section) warn("You prob don't want to specify -k twice");
1748 find_section = optarg;
1749 break;
1125 case 's': { 1750 case 's': {
1126 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");
1127 find_sym = optarg; 1752 find_sym = optarg;
1128 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1)); 1753 versioned_symname = xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1129 sprintf(versioned_symname, "%s@", find_sym); 1754 sprintf(versioned_symname, "%s@", find_sym);
1130 break; 1755 break;
1131 } 1756 }
1132 case 'N': { 1757 case 'N': {
1133 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");
1138 case 'F': { 1763 case 'F': {
1139 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");
1140 out_format = optarg; 1765 out_format = optarg;
1141 break; 1766 break;
1142 } 1767 }
1768 case 'z': {
1769 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1770 size_t x;
1143 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 }
1144 case 'g': gmatch = 1; 1811 case 'g': g_match = 1; break;
1812 case 'L': use_ldcache = 1; break;
1145 case 'y': scan_symlink = 0; break; 1813 case 'y': scan_symlink = 0; break;
1814 case 'A': scan_archives = 1; break;
1146 case 'B': show_banner = 0; break; 1815 case 'B': show_banner = 0; break;
1147 case 'l': scan_ldpath = 1; break; 1816 case 'l': scan_ldpath = 1; break;
1148 case 'p': scan_envpath = 1; break; 1817 case 'p': scan_envpath = 1; break;
1149 case 'R': dir_recurse = 1; break; 1818 case 'R': dir_recurse = 1; break;
1150 case 'm': dir_crossmount = 0; break; 1819 case 'm': dir_crossmount = 0; break;
1820 case 'X': ++fix_elf; break;
1151 case 'x': show_pax = 1; break; 1821 case 'x': show_pax = 1; break;
1152 case 'e': show_phdr = 1; break; 1822 case 'e': show_phdr = 1; break;
1153 case 't': show_textrel = 1; break; 1823 case 't': show_textrel = 1; break;
1154 case 'r': show_rpath = 1; break; 1824 case 'r': show_rpath = 1; break;
1155 case 'n': show_needed = 1; break; 1825 case 'n': show_needed = 1; break;
1157 case 'b': show_bind = 1; break; 1827 case 'b': show_bind = 1; break;
1158 case 'S': show_soname = 1; break; 1828 case 'S': show_soname = 1; break;
1159 case 'T': show_textrels = 1; break; 1829 case 'T': show_textrels = 1; break;
1160 case 'q': be_quiet = 1; break; 1830 case 'q': be_quiet = 1; break;
1161 case 'v': be_verbose = (be_verbose % 20) + 1; break; 1831 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1162 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;
1163 1833 case 'D': show_endian = 1; break;
1164 case ':': 1834 case ':':
1165 err("Option missing parameter\n"); 1835 err("Option '%c' is missing parameter", optopt);
1166 case '?': 1836 case '?':
1167 err("Unknown option\n"); 1837 err("Unknown option '%c' or argument missing", optopt);
1168 default: 1838 default:
1169 err("Unhandled option '%c'", i); 1839 err("Unhandled option '%c'; please report this", i);
1170 }
1171 } 1840 }
1172 1841 }
1842 if (show_textrels && be_verbose) {
1843 if (which("objdump") != NULL)
1844 has_objdump = 1;
1845 }
1173 /* let the format option override all other options */ 1846 /* let the format option override all other options */
1174 if (out_format) { 1847 if (out_format) {
1175 show_pax = show_phdr = show_textrel = show_rpath = \ 1848 show_pax = show_phdr = show_textrel = show_rpath = \
1176 show_needed = show_interp = show_bind = show_soname = \ 1849 show_needed = show_interp = show_bind = show_soname = \
1177 show_textrels = 0; 1850 show_textrels = show_perms = show_endian = 0;
1178 for (i = 0; out_format[i]; ++i) { 1851 for (i = 0; out_format[i]; ++i) {
1179 if (!IS_MODIFIER(out_format[i])) continue; 1852 if (!IS_MODIFIER(out_format[i])) continue;
1180 1853
1181 switch (out_format[++i]) { 1854 switch (out_format[++i]) {
1855 case '+': break;
1182 case '%': break; 1856 case '%': break;
1183 case '#': break; 1857 case '#': break;
1184 case 'F': break; 1858 case 'F': break;
1185 case 'p': break; 1859 case 'p': break;
1186 case 'f': break; 1860 case 'f': break;
1861 case 'k': break;
1187 case 's': break; 1862 case 's': break;
1188 case 'N': break; 1863 case 'N': break;
1189 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;
1190 case 'x': show_pax = 1; break; 1869 case 'x': show_pax = 1; break;
1191 case 'e': show_phdr = 1; break; 1870 case 'e': show_phdr = 1; break;
1192 case 't': show_textrel = 1; break; 1871 case 't': show_textrel = 1; break;
1193 case 'r': show_rpath = 1; break; 1872 case 'r': show_rpath = 1; break;
1194 case 'n': show_needed = 1; break; 1873 case 'n': show_needed = 1; break;
1195 case 'i': show_interp = 1; break; 1874 case 'i': show_interp = 1; break;
1196 case 'b': show_bind = 1; break; 1875 case 'b': show_bind = 1; break;
1197 case 'S': show_soname = 1; break; 1876 case 'S': show_soname = 1; break;
1198 case 'T': show_textrels = 1; break; 1877 case 'T': show_textrels = 1; break;
1199 default: 1878 default:
1200 err("Invalid format specifier '%c' (byte %i)", 1879 err("Invalid format specifier '%c' (byte %i)",
1201 out_format[i], i+1); 1880 out_format[i], i+1);
1202 } 1881 }
1203 } 1882 }
1204 1883
1205 /* construct our default format */ 1884 /* construct our default format */
1206 } else { 1885 } else {
1207 size_t fmt_len = 30; 1886 size_t fmt_len = 30;
1208 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 1887 out_format = xmalloc(sizeof(char) * fmt_len);
1209 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 1888 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1210 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);
1211 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len); 1892 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1212 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 1893 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1213 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 1894 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1214 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 1895 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1215 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 1896 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1216 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len); 1897 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1217 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len); 1898 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1218 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len); 1899 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1219 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);
1220 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len); 1902 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1221 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 1903 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1222 } 1904 }
1223 if (be_verbose > 2) printf("Format: %s\n", out_format); 1905 if (be_verbose > 2) printf("Format: %s\n", out_format);
1224 1906
1225 /* now lets actually do the scanning */ 1907 /* now lets actually do the scanning */
1226 if (scan_ldpath || (show_rpath && be_quiet)) 1908 if (scan_ldpath || use_ldcache)
1227 load_ld_so_conf(); 1909 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
1228 if (scan_ldpath) scanelf_ldpath(); 1910 if (scan_ldpath) scanelf_ldpath();
1229 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 = "-";
1230 if (from_file) { 1914 if (from_file) {
1231 scanelf_from_file(from_file); 1915 scanelf_from_file(from_file);
1232 free(from_file);
1233 from_file = *argv; 1916 from_file = *argv;
1234 } 1917 }
1235 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file) 1918 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1236 err("Nothing to scan !?"); 1919 err("Nothing to scan !?");
1237 while (optind < argc) { 1920 while (optind < argc) {
1238 search_path = argv[optind++]; 1921 search_path = argv[optind++];
1239 scanelf_dir(search_path); 1922 ret = scanelf_dir(search_path);
1240 } 1923 }
1241 1924
1242 /* clean up */ 1925 /* clean up */
1243 if (versioned_symname) free(versioned_symname); 1926 free(versioned_symname);
1244 for (i = 0; ldpaths[i]; ++i) 1927 for (i = 0; ldpaths[i]; ++i)
1245 free(ldpaths[i]); 1928 free(ldpaths[i]);
1246}
1247 1929
1248 1930 if (ldcache != 0)
1249 1931 munmap(ldcache, ldcache_size);
1250/* utility funcs */
1251static char *xstrdup(const char *s)
1252{
1253 char *ret = strdup(s);
1254 if (!ret) err("Could not strdup(): %s", strerror(errno));
1255 return ret; 1932 return ret;
1256} 1933}
1257 1934
1258static void *xmalloc(size_t size) 1935static char **get_split_env(const char *envvar)
1259{ 1936{
1260 void *ret = malloc(size); 1937 const char *delims = " \t\n";
1261 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size); 1938 char **envvals = NULL;
1262 return ret; 1939 char *env, *s;
1263} 1940 int nentry;
1264 1941
1265static void xstrcat(char **dst, const char *src, size_t *curr_len) 1942 if ((env = getenv(envvar)) == NULL)
1266{ 1943 return NULL;
1267 size_t new_len;
1268 1944
1269 new_len = strlen(*dst) + strlen(src); 1945 env = xstrdup(env);
1270 if (*curr_len <= new_len) { 1946 if (env == NULL)
1271 *curr_len = new_len + (*curr_len / 2); 1947 return NULL;
1272 *dst = realloc(*dst, *curr_len);
1273 if (!*dst)
1274 err("could not realloc %li bytes", (unsigned long)*curr_len);
1275 }
1276 1948
1277 strcat(*dst, src); 1949 s = strtok(env, delims);
1278} 1950 if (s == NULL) {
1951 free(env);
1952 return NULL;
1953 }
1279 1954
1280static inline void xchrcat(char **dst, const char append, size_t *curr_len) 1955 nentry = 0;
1281{ 1956 while (s != NULL) {
1282 static char my_app[2]; 1957 ++nentry;
1283 my_app[0] = append; 1958 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
1284 my_app[1] = '\0'; 1959 envvals[nentry-1] = s;
1285 xstrcat(dst, my_app, curr_len); 1960 s = strtok(NULL, delims);
1286} 1961 }
1962 envvals[nentry] = NULL;
1287 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
1288 1985
1289 1986
1290int main(int argc, char *argv[]) 1987int main(int argc, char *argv[])
1291{ 1988{
1989 int ret;
1292 if (argc < 2) 1990 if (argc < 2)
1293 usage(EXIT_FAILURE); 1991 usage(EXIT_FAILURE);
1992 parseenv();
1294 parseargs(argc, argv); 1993 ret = parseargs(argc, argv);
1295 fclose(stdout); 1994 fclose(stdout);
1296#ifdef __BOUNDS_CHECKING_ON 1995#ifdef __PAX_UTILS_CLEANUP
1297 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");
1298#endif 2000#endif
1299 return EXIT_SUCCESS; 2001 return ret;
1300} 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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