/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.88 Revision 1.267
1/* 1/*
2 * Copyright 2003-2005 Gentoo Foundation 2 * Copyright 2003-2012 Gentoo Foundation
3 * Distributed under the terms of the GNU General Public License v2 3 * Distributed under the terms of the GNU General Public License v2
4 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.88 2005/09/30 03:30:54 vapier Exp $ 4 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.267 2014/10/19 07:31:20 vapier Exp $
5 * 5 *
6 * Copyright 2003-2005 Ned Ludd - <solar@gentoo.org> 6 * Copyright 2003-2012 Ned Ludd - <solar@gentoo.org>
7 * Copyright 2004-2005 Mike Frysinger - <vapier@gentoo.org> 7 * Copyright 2004-2012 Mike Frysinger - <vapier@gentoo.org>
8 */ 8 */
9 9
10#include <stdio.h> 10static const char rcsid[] = "$Id: scanelf.c,v 1.267 2014/10/19 07:31:20 vapier Exp $";
11#include <stdlib.h> 11const char argv0[] = "scanelf";
12#include <sys/types.h> 12
13#include <libgen.h>
14#include <limits.h>
15#define __USE_GNU
16#include <string.h>
17#include <errno.h>
18#include <unistd.h>
19#include <sys/stat.h>
20#include <dirent.h>
21#include <getopt.h>
22#include <assert.h>
23#include "paxelf.h" 13#include "paxinc.h"
24 14
25static const char *rcsid = "$Id: scanelf.c,v 1.88 2005/09/30 03:30:54 vapier Exp $";
26#define argv0 "scanelf"
27
28#define IS_MODIFIER(c) (c == '%' || c == '#') 15#define IS_MODIFIER(c) (c == '%' || c == '#' || c == '+')
29
30
31 16
32/* prototypes */ 17/* prototypes */
33static void scanelf_file(const char *filename); 18static int file_matches_list(const char *filename, char **matchlist);
34static void scanelf_dir(const char *path);
35static void scanelf_ldpath();
36static void scanelf_envpath();
37static void usage(int status);
38static void parseargs(int argc, char *argv[]);
39static char *xstrdup(const char *s);
40static void *xmalloc(size_t size);
41static void xstrcat(char **dst, const char *src, size_t *curr_len);
42static inline void xchrcat(char **dst, const char append, size_t *curr_len);
43 19
44/* variables to control behavior */ 20/* variables to control behavior */
45static char *ldpaths[256]; 21static array_t _match_etypes = array_init_decl, *match_etypes = &_match_etypes;
22static array_t _ldpaths = array_init_decl, *ldpaths = &_ldpaths;
46static char scan_ldpath = 0; 23static char scan_ldpath = 0;
47static char scan_envpath = 0; 24static char scan_envpath = 0;
48static char scan_symlink = 1; 25static char scan_symlink = 1;
26static char scan_archives = 0;
49static char dir_recurse = 0; 27static char dir_recurse = 0;
50static char dir_crossmount = 1; 28static char dir_crossmount = 1;
51static char show_pax = 0; 29static char show_pax = 0;
30static char show_perms = 0;
31static char show_size = 0;
52static char show_phdr = 0; 32static char show_phdr = 0;
53static char show_textrel = 0; 33static char show_textrel = 0;
54static char show_rpath = 0; 34static char show_rpath = 0;
55static char show_needed = 0; 35static char show_needed = 0;
56static char show_interp = 0; 36static char show_interp = 0;
57static char show_bind = 0; 37static char show_bind = 0;
58static char show_soname = 0; 38static char show_soname = 0;
59static char show_textrels = 0; 39static char show_textrels = 0;
60static char show_banner = 1; 40static char show_banner = 1;
41static char show_endian = 0;
42static char show_osabi = 0;
43static char show_eabi = 0;
61static char be_quiet = 0; 44static char be_quiet = 0;
62static char be_verbose = 0; 45static char be_verbose = 0;
63static char be_wewy_wewy_quiet = 0; 46static char be_wewy_wewy_quiet = 0;
64static char *find_sym = NULL, *versioned_symname = NULL; 47static char be_semi_verbose = 0;
48static char *find_sym = NULL;
49static array_t _find_sym_arr = array_init_decl, *find_sym_arr = &_find_sym_arr;
50static array_t _find_sym_regex_arr = array_init_decl, *find_sym_regex_arr = &_find_sym_regex_arr;
65static char *find_lib = NULL; 51static char *find_lib = NULL;
52static array_t _find_lib_arr = array_init_decl, *find_lib_arr = &_find_lib_arr;
53static char *find_section = NULL;
54static array_t _find_section_arr = array_init_decl, *find_section_arr = &_find_section_arr;
66static char *out_format = NULL; 55static char *out_format = NULL;
67static char *search_path = NULL; 56static char *search_path = NULL;
57static char fix_elf = 0;
68static char gmatch = 0; 58static char g_match = 0;
59static char use_ldcache = 0;
60static char use_ldpath = 0;
69 61
62static char **qa_textrels = NULL;
63static char **qa_execstack = NULL;
64static char **qa_wx_load = NULL;
65static int root_fd = AT_FDCWD;
70 66
67static int match_bits = 0;
68static unsigned int match_perms = 0;
69static void *ldcache = NULL;
70static size_t ldcache_size = 0;
71static unsigned long setpax = 0UL;
72
73static const char *objdump;
74
75/* Find the path to a file by name. Note: we do not currently handle the
76 * empty path element correctly (should behave by searching $PWD). */
77static const char *which(const char *fname, const char *envvar)
78{
79 size_t path_len, fname_len;
80 const char *env_path;
81 char *path, *p, *ep;
82
83 p = getenv(envvar);
84 if (p)
85 return p;
86
87 env_path = getenv("PATH");
88 if (!env_path)
89 return NULL;
90
91 /* Create a copy of the $PATH that we can safely modify.
92 * Make it a little bigger so we can append "/fname".
93 * We do this twice -- once for a perm copy, and once for
94 * room at the end of the last element. */
95 path_len = strlen(env_path);
96 fname_len = strlen(fname);
97 path = xmalloc(path_len + (fname_len * 2) + 2 + 2);
98 memcpy(path, env_path, path_len + 1);
99
100 p = path + path_len + 1 + fname_len + 1;
101 *p = '/';
102 memcpy(p + 1, fname, fname_len + 1);
103
104 /* Repoint fname to the copy in the env string as it has
105 * the leading slash which we can include in a single memcpy.
106 * Increase the fname len to include the '/' and '\0'. */
107 fname = p;
108 fname_len += 2;
109
110 p = path;
111 while (p) {
112 ep = strchr(p, ':');
113 /* Append the /foo path to the current element. */
114 if (ep)
115 memcpy(ep, fname, fname_len);
116 else
117 memcpy(path + path_len, fname, fname_len);
118
119 if (access(p, R_OK) != -1)
120 return p;
121
122 p = ep;
123 if (ep) {
124 /* If not the last element, restore the chunk we clobbered. */
125 size_t offset = ep - path;
126 size_t restore = min(path_len - offset, fname_len);
127 memcpy(ep, env_path + offset, restore);
128 ++p;
129 }
130 }
131
132 free(path);
133 return NULL;
134}
135
136static FILE *fopenat_r(int dir_fd, const char *path)
137{
138 int fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
139 if (fd == -1)
140 return NULL;
141 return fdopen(fd, "re");
142}
143
144static const char *root_rel_path(const char *path)
145{
146 /*
147 * openat() will ignore the dirfd if path starts with
148 * a /, so consume all of that noise
149 *
150 * XXX: we don't handle relative paths like ../ that
151 * break out of the --root option, but for now, just
152 * don't do that :P.
153 */
154 if (root_fd != AT_FDCWD) {
155 while (*path == '/')
156 ++path;
157 if (*path == '\0')
158 path = ".";
159 }
160
161 return path;
162}
163
71/* sub-funcs for scanelf_file() */ 164/* sub-funcs for scanelf_fileat() */
72static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab) 165static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **str)
73{ 166{
74 /* find the best SHT_DYNSYM and SHT_STRTAB sections */ 167 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
168
169 /* debug sections */
170 void *symtab = elf_findsecbyname(elf, ".symtab");
171 void *strtab = elf_findsecbyname(elf, ".strtab");
172 /* runtime sections */
173 void *dynsym = elf_findsecbyname(elf, ".dynsym");
174 void *dynstr = elf_findsecbyname(elf, ".dynstr");
175
176 /*
177 * If the sections are marked NOBITS, then they don't exist, so we just
178 * skip them. This let's us work sanely with splitdebug ELFs (rather
179 * than spewing a lot of "corrupt ELF" messages later on). In malformed
180 * ELFs, the section might be wrongly set to NOBITS, but screw em.
181 *
182 * We need to make sure the debug/runtime sym/str sets are used together
183 * as they are generated in sync. Trying to mix them won't work.
184 */
75#define GET_SYMTABS(B) \ 185#define GET_SYMTABS(B) \
76 if (elf->elf_class == ELFCLASS ## B) { \ 186 if (elf->elf_class == ELFCLASS ## B) { \
77 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \ 187 Elf ## B ## _Shdr *esymtab = symtab; \
78 /* debug sections */ \ 188 Elf ## B ## _Shdr *estrtab = strtab; \
79 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \ 189 Elf ## B ## _Shdr *edynsym = dynsym; \
80 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \ 190 Elf ## B ## _Shdr *edynstr = dynstr; \
81 /* runtime sections */ \ 191 \
82 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \ 192 if (symtab && EGET(esymtab->sh_type) == SHT_NOBITS) \
83 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \ 193 symtab = NULL; \
84 if (symtab && dynsym) { \ 194 if (dynsym && EGET(edynsym->sh_type) == SHT_NOBITS) \
85 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \ 195 dynsym = NULL; \
196 if (strtab && EGET(estrtab->sh_type) == SHT_NOBITS) \
197 strtab = NULL; \
198 if (dynstr && EGET(edynstr->sh_type) == SHT_NOBITS) \
199 dynstr = NULL; \
200 \
201 /* Use the set with more symbols if both exist. */ \
202 if (symtab && dynsym && strtab && dynstr) { \
203 if (EGET(esymtab->sh_size) > EGET(edynsym->sh_size)) \
204 goto debug##B; \
86 } else { \ 205 else \
87 *sym = (void*)(symtab ? symtab : dynsym); \ 206 goto runtime##B; \
207 } else if (symtab && strtab) { \
208 debug##B: \
209 *sym = symtab; \
210 *str = strtab; \
211 return; \
212 } else if (dynsym && dynstr) { \
213 runtime##B: \
214 *sym = dynsym; \
215 *str = dynstr; \
216 return; \
88 } \ 217 } \
89 if (strtab && dynstr) { \
90 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \
91 } else { \
92 *tab = (void*)(strtab ? strtab : dynstr); \
93 } \
94 } 218 }
95 GET_SYMTABS(32) 219 GET_SYMTABS(32)
96 GET_SYMTABS(64) 220 GET_SYMTABS(64)
221
222 if (*sym && *str)
223 return;
224
225 /*
226 * damn, they're really going to make us work for it huh?
227 * reconstruct the section header info out of the dynamic
228 * tags so we can see what symbols this guy uses at runtime.
229 */
230#define GET_SYMTABS_DT(B) \
231 if (elf->elf_class == ELFCLASS ## B) { \
232 size_t i; \
233 static Elf ## B ## _Shdr sym_shdr, str_shdr; \
234 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
235 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
236 Elf ## B ## _Addr vsym, vstr, vhash, vgnu_hash; \
237 Elf ## B ## _Dyn *dyn; \
238 Elf ## B ## _Off offset; \
239 \
240 /* lookup symbols used at runtime with DT_SYMTAB / DT_STRTAB */ \
241 vsym = vstr = vhash = vgnu_hash = 0; \
242 memset(&sym_shdr, 0, sizeof(sym_shdr)); \
243 memset(&str_shdr, 0, sizeof(str_shdr)); \
244 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
245 if (EGET(phdr[i].p_type) != PT_DYNAMIC) \
246 continue; \
247 \
248 offset = EGET(phdr[i].p_offset); \
249 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
250 continue; \
251 \
252 dyn = DYN ## B (elf->vdata + offset); \
253 while (EGET(dyn->d_tag) != DT_NULL) { \
254 switch (EGET(dyn->d_tag)) { \
255 case DT_SYMTAB: vsym = EGET(dyn->d_un.d_val); break; \
256 case DT_SYMENT: sym_shdr.sh_entsize = dyn->d_un.d_val; break; \
257 case DT_STRTAB: vstr = EGET(dyn->d_un.d_val); break; \
258 case DT_STRSZ: str_shdr.sh_size = dyn->d_un.d_val; break; \
259 case DT_HASH: vhash = EGET(dyn->d_un.d_val); break; \
260 /*case DT_GNU_HASH: vgnu_hash = EGET(dyn->d_un.d_val); break;*/ \
261 } \
262 ++dyn; \
263 } \
264 if (vsym && vstr) \
265 break; \
266 } \
267 if (!vsym || !vstr || !(vhash || vgnu_hash)) \
268 return; \
269 \
270 /* calc offset into the ELF by finding the load addr of the syms */ \
271 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
272 Elf ## B ## _Addr vaddr = EGET(phdr[i].p_vaddr); \
273 Elf ## B ## _Addr filesz = EGET(phdr[i].p_filesz); \
274 offset = EGET(phdr[i].p_offset); \
275 \
276 if (EGET(phdr[i].p_type) != PT_LOAD) \
277 continue; \
278 \
279 if (vhash >= vaddr && vhash < vaddr + filesz) { \
280 /* Scan the hash table to see how many entries we have */ \
281 Elf32_Word max_sym_idx = 0; \
282 Elf32_Word *hashtbl = elf->vdata + offset + (vhash - vaddr); \
283 Elf32_Word b, nbuckets = EGET(hashtbl[0]); \
284 Elf32_Word nchains = EGET(hashtbl[1]); \
285 Elf32_Word *buckets = &hashtbl[2]; \
286 Elf32_Word *chains = &buckets[nbuckets]; \
287 Elf32_Word sym_idx; \
288 \
289 for (b = 0; b < nbuckets; ++b) { \
290 if (!buckets[b]) \
291 continue; \
292 for (sym_idx = buckets[b]; sym_idx < nchains && sym_idx; sym_idx = chains[sym_idx]) \
293 if (max_sym_idx < sym_idx) \
294 max_sym_idx = sym_idx; \
295 } \
296 ESET(sym_shdr.sh_size, sym_shdr.sh_entsize * max_sym_idx); \
297 } \
298 \
299 if (vsym >= vaddr && vsym < vaddr + filesz) { \
300 ESET(sym_shdr.sh_offset, offset + (vsym - vaddr)); \
301 *sym = &sym_shdr; \
302 } \
303 \
304 if (vstr >= vaddr && vstr < vaddr + filesz) { \
305 ESET(str_shdr.sh_offset, offset + (vstr - vaddr)); \
306 *str = &str_shdr; \
307 } \
308 } \
309 }
310 GET_SYMTABS_DT(32)
311 GET_SYMTABS_DT(64)
97} 312}
313
98static char *scanelf_file_pax(elfobj *elf, char *found_pax) 314static char *scanelf_file_pax(elfobj *elf, char *found_pax)
99{ 315{
100 static char *paxflags;
101 static char ret[7]; 316 static char ret[7];
102 unsigned long i, shown; 317 unsigned long i, shown;
103 318
104 if (!show_pax) return NULL; 319 if (!show_pax) return NULL;
105 320
112 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 327 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
113 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 328 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
114 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 329 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
115 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \ 330 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
116 continue; \ 331 continue; \
117 if (be_quiet && (EGET(phdr[i].p_flags) == 10240)) \ 332 if (fix_elf && setpax) { \
333 /* set the paxctl flags */ \
334 ESET(phdr[i].p_flags, setpax); \
335 } \
336 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
118 continue; \ 337 continue; \
119 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \ 338 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
120 *found_pax = 1; \ 339 *found_pax = 1; \
121 ++shown; \ 340 ++shown; \
122 break; \ 341 break; \
124 } 343 }
125 SHOW_PAX(32) 344 SHOW_PAX(32)
126 SHOW_PAX(64) 345 SHOW_PAX(64)
127 } 346 }
128 347
348 /* Note: We do not support setting EI_PAX if not PT_PAX_FLAGS
349 * was found. This is known to break ELFs on glibc systems,
350 * and mainline PaX has deprecated use of this for a long time.
351 * We could support changing PT_GNU_STACK, but that doesn't
352 * seem like it's worth the effort. #411919
353 */
354
129 /* fall back to EI_PAX if no PT_PAX was found */ 355 /* fall back to EI_PAX if no PT_PAX was found */
130 if (!*ret) { 356 if (!*ret) {
357 static char *paxflags;
131 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf)); 358 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
132 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) { 359 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
133 *found_pax = 1; 360 *found_pax = 1;
134 return paxflags; 361 return (be_wewy_wewy_quiet ? NULL : paxflags);
135 } 362 }
136 strncpy(ret, paxflags, sizeof(ret)); 363 strncpy(ret, paxflags, sizeof(ret));
137 } 364 }
138 365
139 if (be_quiet && !shown) 366 if (be_wewy_wewy_quiet || (be_quiet && !shown))
140 return NULL; 367 return NULL;
368 else
141 return ret; 369 return ret;
142
143} 370}
371
144static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load) 372static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
145{ 373{
146 static char ret[12]; 374 static char ret[12];
147 char *found; 375 char *found;
148 unsigned long i, off, shown, check_flags;
149 unsigned char multi_stack, multi_relro, multi_load; 376 unsigned long i, shown, multi_stack, multi_relro, multi_load;
150 377
151 if (!show_phdr) return NULL; 378 if (!show_phdr) return NULL;
152 379
153 memcpy(ret, "--- --- ---\0", 12); 380 memcpy(ret, "--- --- ---\0", 12);
154 381
155 shown = 0; 382 shown = 0;
156 multi_stack = multi_relro = multi_load = 0; 383 multi_stack = multi_relro = multi_load = 0;
157 384
158 if (elf->phdr) { 385#define NOTE_GNU_STACK ".note.GNU-stack"
159#define SHOW_PHDR(B) \ 386#define SHOW_PHDR(B) \
160 if (elf->elf_class == ELFCLASS ## B) { \ 387 if (elf->elf_class == ELFCLASS ## B) { \
161 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 388 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
389 Elf ## B ## _Off offset; \
390 uint32_t flags, check_flags; \
391 if (elf->phdr != NULL) { \
162 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 392 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
163 uint32_t flags; \
164 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 393 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
165 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \ 394 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
395 if (multi_stack++) \
166 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \ 396 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
397 if (file_matches_list(elf->filename, qa_execstack)) \
398 continue; \
167 found = found_phdr; \ 399 found = found_phdr; \
168 off = 0; \ 400 offset = 0; \
169 check_flags = PF_X; \ 401 check_flags = PF_X; \
170 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \ 402 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
403 if (multi_relro++) \
171 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \ 404 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
172 found = found_relro; \ 405 found = found_relro; \
173 off = 4; \ 406 offset = 4; \
174 check_flags = PF_X; \ 407 check_flags = PF_X; \
175 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \ 408 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
176 if (multi_load++ > 2) warnf("%s: more than 2 PT_LOAD's !?", elf->filename); \ 409 if (file_matches_list(elf->filename, qa_wx_load)) \
410 continue; \
177 found = found_load; \ 411 found = found_load; \
178 off = 8; \ 412 offset = 8; \
179 check_flags = PF_W|PF_X; \ 413 check_flags = PF_W|PF_X; \
180 } else \ 414 } else \
181 continue; \ 415 continue; \
182 flags = EGET(phdr[i].p_flags); \ 416 flags = EGET(phdr[i].p_flags); \
183 if (be_quiet && ((flags & check_flags) != check_flags)) \ 417 if (be_quiet && ((flags & check_flags) != check_flags)) \
184 continue; \ 418 continue; \
419 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
420 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
421 ret[3] = ret[7] = '!'; \
422 flags = EGET(phdr[i].p_flags); \
423 } \
185 memcpy(ret+off, gnu_short_stack_flags(flags), 3); \ 424 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
186 *found = 1; \ 425 *found = 1; \
187 ++shown; \ 426 ++shown; \
427 } \
428 } else if (elf->shdr != NULL) { \
429 /* no program headers which means this is prob an object file */ \
430 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
431 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
432 char *str; \
433 if ((void*)strtbl > elf->data_end) \
434 goto skip_this_shdr##B; \
435 /* let's flag -w/+x object files since the final ELF will most likely \
436 * need write access to the stack (who doesn't !?). so the combined \
437 * output will bring in +w automatically and that's bad. \
438 */ \
439 check_flags = /*SHF_WRITE|*/SHF_EXECINSTR; \
440 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
441 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
442 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
443 str = elf->data + offset; \
444 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
445 if (!strcmp(str, NOTE_GNU_STACK)) { \
446 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
447 flags = EGET(shdr[i].sh_flags); \
448 if (be_quiet && ((flags & check_flags) != check_flags)) \
449 continue; \
450 ++*found_phdr; \
451 shown = 1; \
452 if (flags & SHF_WRITE) ret[0] = 'W'; \
453 if (flags & SHF_ALLOC) ret[1] = 'A'; \
454 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
455 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
456 break; \
457 } \
458 } \
459 skip_this_shdr##B: \
460 if (!multi_stack) { \
461 if (file_matches_list(elf->filename, qa_execstack)) \
462 return NULL; \
463 *found_phdr = 1; \
464 shown = 1; \
465 memcpy(ret, "!WX", 3); \
466 } \
188 } \ 467 } \
189 } 468 }
190 SHOW_PHDR(32) 469 SHOW_PHDR(32)
191 SHOW_PHDR(64) 470 SHOW_PHDR(64)
192 }
193 471
194 if (be_quiet && !shown) 472 if (be_wewy_wewy_quiet || (be_quiet && !shown))
195 return NULL; 473 return NULL;
196 else 474 else
197 return ret; 475 return ret;
198} 476}
477
478/*
479 * See if this ELF contains a DT_TEXTREL tag in any of its
480 * PT_DYNAMIC sections.
481 */
199static char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 482static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
200{ 483{
201 static char ret[] = "TEXTREL"; 484 static const char *ret = "TEXTREL";
202 unsigned long i; 485 unsigned long i;
203 486
204 if (!show_textrel && !show_textrels) return NULL; 487 if (!show_textrel && !show_textrels) return NULL;
488
489 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
205 490
206 if (elf->phdr) { 491 if (elf->phdr) {
207#define SHOW_TEXTREL(B) \ 492#define SHOW_TEXTREL(B) \
208 if (elf->elf_class == ELFCLASS ## B) { \ 493 if (elf->elf_class == ELFCLASS ## B) { \
209 Elf ## B ## _Dyn *dyn; \ 494 Elf ## B ## _Dyn *dyn; \
210 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 495 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
211 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 496 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
212 Elf ## B ## _Off offset; \ 497 Elf ## B ## _Off offset; \
213 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 498 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
214 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 499 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
215 offset = EGET(phdr[i].p_offset); \ 500 offset = EGET(phdr[i].p_offset); \
216 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 501 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
217 dyn = DYN ## B (elf->data + offset); \ 502 dyn = DYN ## B (elf->vdata + offset); \
218 while (EGET(dyn->d_tag) != DT_NULL) { \ 503 while (EGET(dyn->d_tag) != DT_NULL) { \
219 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \ 504 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
220 *found_textrel = 1; \ 505 *found_textrel = 1; \
221 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \ 506 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
222 return (be_wewy_wewy_quiet ? NULL : ret); \ 507 return (be_wewy_wewy_quiet ? NULL : ret); \
229 } 514 }
230 515
231 if (be_quiet || be_wewy_wewy_quiet) 516 if (be_quiet || be_wewy_wewy_quiet)
232 return NULL; 517 return NULL;
233 else 518 else
234 return (char *)" - "; 519 return " - ";
235} 520}
521
522/*
523 * Scan the .text section to see if there are any relocations in it.
524 * Should rewrite this to check PT_LOAD sections that are marked
525 * Executable rather than the section named '.text'.
526 */
236static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel) 527static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
237{ 528{
238 unsigned long s, r, rmax; 529 unsigned long s, r, rmax;
239 void *symtab_void, *strtab_void, *text_void; 530 void *symtab_void, *strtab_void, *text_void;
240 531
261 Elf ## B ## _Rela *rela; \ 552 Elf ## B ## _Rela *rela; \
262 /* search the section headers for relocations */ \ 553 /* search the section headers for relocations */ \
263 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \ 554 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
264 uint32_t sh_type = EGET(shdr[s].sh_type); \ 555 uint32_t sh_type = EGET(shdr[s].sh_type); \
265 if (sh_type == SHT_REL) { \ 556 if (sh_type == SHT_REL) { \
266 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \ 557 rel = REL ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
267 rela = NULL; \ 558 rela = NULL; \
268 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \ 559 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
269 } else if (sh_type == SHT_RELA) { \ 560 } else if (sh_type == SHT_RELA) { \
270 rel = NULL; \ 561 rel = NULL; \
271 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \ 562 rela = RELA ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
272 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \ 563 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
273 } else \ 564 } else \
274 continue; \ 565 continue; \
275 /* now see if any of the relocs are in the .text */ \ 566 /* now see if any of the relocs are in the .text */ \
276 for (r = 0; r < rmax; ++r) { \ 567 for (r = 0; r < rmax; ++r) { \
291 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \ 582 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
292 if (be_verbose <= 2) continue; \ 583 if (be_verbose <= 2) continue; \
293 } else \ 584 } else \
294 *found_textrels = 1; \ 585 *found_textrels = 1; \
295 /* locate this relocation symbol name */ \ 586 /* locate this relocation symbol name */ \
296 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 587 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
588 if ((void*)sym > elf->data_end) { \
589 warn("%s: corrupt ELF symbol", elf->filename); \
590 continue; \
591 } \
297 sym_max = ELF ## B ## _R_SYM(r_info); \ 592 sym_max = ELF ## B ## _R_SYM(r_info); \
298 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \ 593 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
299 sym += sym_max; \ 594 sym += sym_max; \
300 else \ 595 else \
301 sym = NULL; \ 596 sym = NULL; \
302 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 597 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
303 /* show the raw details about this reloc */ \ 598 /* show the raw details about this reloc */ \
304 printf(" %s: ", elf->base_filename); \ 599 printf(" %s: ", elf->base_filename); \
305 if (sym && sym->st_name) \ 600 if (sym && sym->st_name) \
306 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \ 601 printf("%s", elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
307 else \ 602 else \
308 printf("(memory/fake?)"); \ 603 printf("(memory/data?)"); \
309 printf(" [0x%lX]", (unsigned long)r_offset); \ 604 printf(" [0x%lX]", (unsigned long)r_offset); \
310 /* now try to find the closest symbol that this rel is probably in */ \ 605 /* now try to find the closest symbol that this rel is probably in */ \
311 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 606 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
312 func = NULL; \ 607 func = NULL; \
313 offset_tmp = 0; \ 608 offset_tmp = 0; \
314 while (sym_max--) { \ 609 while (sym_max--) { \
315 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \ 610 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
316 func = sym; \ 611 func = sym; \
317 offset_tmp = EGET(sym->st_value); \ 612 offset_tmp = EGET(sym->st_value); \
318 } \ 613 } \
319 ++sym; \ 614 ++sym; \
320 } \ 615 } \
321 printf(" in "); \ 616 printf(" in "); \
322 if (func && func->st_name) \ 617 if (func && func->st_name) { \
323 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \ 618 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
619 if (r_offset > EGET(func->st_size)) \
620 printf("(optimized out: previous %s)", func_name); \
324 else \ 621 else \
325 printf("(NULL: fake?)"); \ 622 printf("%s", func_name); \
623 } else \
624 printf("(optimized out)"); \
326 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \ 625 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
626 if (be_verbose && objdump) { \
627 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
628 char *sysbuf; \
629 size_t syslen; \
630 const char sysfmt[] = "%s -r -R -d -w -l --start-address=0x%lX --stop-address=0x%lX %s | grep --color -i -C 3 '.*[[:space:]]%lX:[[:space:]]*R_.*'\n"; \
631 syslen = sizeof(sysfmt) + strlen(objdump) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
632 sysbuf = xmalloc(syslen); \
633 if (end_addr < r_offset) \
634 /* not uncommon when things are optimized out */ \
635 end_addr = r_offset + 0x100; \
636 snprintf(sysbuf, syslen, sysfmt, \
637 objdump, \
638 (unsigned long)offset_tmp, \
639 (unsigned long)end_addr, \
640 elf->filename, \
641 (unsigned long)r_offset); \
642 fflush(stdout); \
643 if (system(sysbuf)) {/* don't care */} \
644 fflush(stdout); \
645 free(sysbuf); \
646 } \
327 } \ 647 } \
328 } } 648 } }
329 SHOW_TEXTRELS(32) 649 SHOW_TEXTRELS(32)
330 SHOW_TEXTRELS(64) 650 SHOW_TEXTRELS(64)
331 } 651 }
333 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename); 653 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
334 654
335 return NULL; 655 return NULL;
336} 656}
337 657
338static void rpath_security_checks(elfobj *, char *);
339static void rpath_security_checks(elfobj *elf, char *item) { 658static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
659{
340 struct stat st; 660 struct stat st;
341 switch (*item) { 661 switch (*item) {
662 case '/': break;
342 case 0: 663 case '.':
343 warnf("Security problem NULL RPATH in %s", elf->filename); 664 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
344 break; 665 break;
345 case '/': break; 666 case ':':
667 case '\0':
668 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
669 break;
346 case '$': 670 case '$':
347 if (fstat(elf->fd, &st) != -1) 671 if (fstat(elf->fd, &st) != -1)
348 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID)) 672 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
349 warnf("Security problem with RPATH='%s' in %s with mode set of %o", 673 warnf("Security problem with %s='%s' in %s with mode set of %o",
350 item, elf->filename, st.st_mode & 07777); 674 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
351 break; 675 break;
352 default: 676 default:
353 warnf("Maybe? sec problem with RPATH='%s' in %s", item, elf->filename); 677 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
354 break; 678 break;
355 } 679 }
356} 680}
357static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len) 681static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
358{ 682{
359 unsigned long i, s; 683 unsigned long i;
360 char *rpath, *runpath, **r; 684 char *rpath, *runpath, **r;
361 void *strtbl_void; 685 void *strtbl_void;
362 686
363 if (!show_rpath) return; 687 if (!show_rpath) return;
364 688
375 Elf ## B ## _Off offset; \ 699 Elf ## B ## _Off offset; \
376 Elf ## B ## _Xword word; \ 700 Elf ## B ## _Xword word; \
377 /* Scan all the program headers */ \ 701 /* Scan all the program headers */ \
378 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 702 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
379 /* Just scan dynamic headers */ \ 703 /* Just scan dynamic headers */ \
380 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 704 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
381 offset = EGET(phdr[i].p_offset); \ 705 offset = EGET(phdr[i].p_offset); \
382 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 706 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
383 /* Just scan dynamic RPATH/RUNPATH headers */ \ 707 /* Just scan dynamic RPATH/RUNPATH headers */ \
384 dyn = DYN ## B (elf->data + offset); \ 708 dyn = DYN ## B (elf->vdata + offset); \
385 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \ 709 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
386 if (word == DT_RPATH) { \ 710 if (word == DT_RPATH) { \
387 r = &rpath; \ 711 r = &rpath; \
388 } else if (word == DT_RUNPATH) { \ 712 } else if (word == DT_RUNPATH) { \
389 r = &runpath; \ 713 r = &runpath; \
393 } \ 717 } \
394 /* Verify the memory is somewhat sane */ \ 718 /* Verify the memory is somewhat sane */ \
395 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 719 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
396 if (offset < (Elf ## B ## _Off)elf->len) { \ 720 if (offset < (Elf ## B ## _Off)elf->len) { \
397 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \ 721 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
398 *r = (char*)(elf->data + offset); \ 722 *r = elf->data + offset; \
723 /* cache the length in case we need to nuke this section later on */ \
724 if (fix_elf) \
725 offset = strlen(*r); \
399 /* If quiet, don't output paths in ld.so.conf */ \ 726 /* If quiet, don't output paths in ld.so.conf */ \
400 if (be_quiet) { \ 727 if (be_quiet) { \
401 size_t len; \ 728 size_t len; \
402 char *start, *end; \ 729 char *start, *end; \
403 /* note that we only 'chop' off leading known paths. */ \ 730 /* note that we only 'chop' off leading known paths. */ \
404 /* since *r is read-only memory, we can only move the ptr forward. */ \ 731 /* since *r is read-only memory, we can only move the ptr forward. */ \
405 start = *r; \ 732 start = *r; \
406 /* scan each path in : delimited list */ \ 733 /* scan each path in : delimited list */ \
407 while (start) { \ 734 while (start) { \
408 rpath_security_checks(elf, start); \ 735 rpath_security_checks(elf, start, get_elfdtype(word)); \
409 end = strchr(start, ':'); \ 736 end = strchr(start, ':'); \
410 len = (end ? abs(end - start) : strlen(start)); \ 737 len = (end ? abs(end - start) : strlen(start)); \
411 for (s = 0; ldpaths[s]; ++s) { \ 738 if (use_ldcache) { \
739 size_t n; \
740 const char *ldpath; \
741 array_for_each(ldpaths, n, ldpath) \
412 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \ 742 if (!strncmp(ldpath, start, len) && !ldpath[len]) { \
413 *r = (end ? end + 1 : NULL); \ 743 *r = end; \
744 /* corner case ... if RPATH reads "/usr/lib:", we want \
745 * to show ':' rather than '' */ \
746 if (end && end[1] != '\0') \
747 (*r)++; \
414 break; \ 748 break; \
415 } \ 749 } \
416 } \ 750 } \
417 if (!*r || !ldpaths[s] || !end) \ 751 if (!*r || !end) \
418 start = NULL; \ 752 break; \
419 else \ 753 else \
420 start = start + len + 1; \ 754 start = start + len + 1; \
421 } \ 755 } \
422 } \ 756 } \
757 if (*r) { \
758 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
759 /* just nuke it */ \
760 nuke_it##B: \
761 memset(*r, 0x00, offset); \
762 *r = NULL; \
763 ESET(dyn->d_tag, DT_DEBUG); \
764 ESET(dyn->d_un.d_ptr, 0); \
765 } else if (fix_elf) { \
766 /* try to clean "bad" paths */ \
767 size_t len, tmpdir_len; \
768 char *start, *end; \
769 const char *tmpdir; \
770 start = *r; \
771 tmpdir = (getenv("TMPDIR") ? : "."); \
772 tmpdir_len = strlen(tmpdir); \
773 while (1) { \
774 end = strchr(start, ':'); \
775 if (start == end) { \
776 eat_this_path##B: \
777 len = strlen(end); \
778 memmove(start, end+1, len); \
779 start[len-1] = '\0'; \
780 end = start - 1; \
781 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
782 if (!end) { \
783 if (start == *r) \
784 goto nuke_it##B; \
785 *--start = '\0'; \
786 } else \
787 goto eat_this_path##B; \
788 } \
789 if (!end) \
790 break; \
791 start = end + 1; \
792 } \
793 if (**r == '\0') \
794 goto nuke_it##B; \
795 } \
796 if (*r) \
423 if (*r) *found_rpath = 1; \ 797 *found_rpath = 1; \
798 } \
424 } \ 799 } \
425 ++dyn; \ 800 ++dyn; \
426 } \ 801 } \
427 } } 802 } }
428 SHOW_RPATH(32) 803 SHOW_RPATH(32)
445 } else if (rpath || runpath) 820 } else if (rpath || runpath)
446 xstrcat(ret, (runpath ? runpath : rpath), ret_len); 821 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
447 else if (!be_quiet) 822 else if (!be_quiet)
448 xstrcat(ret, " - ", ret_len); 823 xstrcat(ret, " - ", ret_len);
449} 824}
825
826/* Defines can be seen in glibc's sysdeps/generic/ldconfig.h */
827#define LDSO_CACHE_MAGIC "ld.so-"
828#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
829#define LDSO_CACHE_VER "1.7.0"
830#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
831#define FLAG_ANY -1
832#define FLAG_TYPE_MASK 0x00ff
833#define FLAG_LIBC4 0x0000
834#define FLAG_ELF 0x0001
835#define FLAG_ELF_LIBC5 0x0002
836#define FLAG_ELF_LIBC6 0x0003
837#define FLAG_REQUIRED_MASK 0xff00
838#define FLAG_SPARC_LIB64 0x0100
839#define FLAG_IA64_LIB64 0x0200
840#define FLAG_X8664_LIB64 0x0300
841#define FLAG_S390_LIB64 0x0400
842#define FLAG_POWERPC_LIB64 0x0500
843#define FLAG_MIPS64_LIBN32 0x0600
844#define FLAG_MIPS64_LIBN64 0x0700
845#define FLAG_X8664_LIBX32 0x0800
846#define FLAG_ARM_LIBHF 0x0900
847#define FLAG_AARCH64_LIB64 0x0a00
848
849#if defined(__GLIBC__) || defined(__UCLIBC__)
850
851static char *lookup_cache_lib(elfobj *elf, const char *fname)
852{
853 int fd;
854 char *strs;
855 static char buf[__PAX_UTILS_PATH_MAX] = "";
856 const char *cachefile = root_rel_path("/etc/ld.so.cache");
857 struct stat st;
858
859 typedef struct {
860 char magic[LDSO_CACHE_MAGIC_LEN];
861 char version[LDSO_CACHE_VER_LEN];
862 int nlibs;
863 } header_t;
864 header_t *header;
865
866 typedef struct {
867 int flags;
868 int sooffset;
869 int liboffset;
870 } libentry_t;
871 libentry_t *libent;
872
873 if (fname == NULL)
874 return NULL;
875
876 if (ldcache == NULL) {
877 if (fstatat(root_fd, cachefile, &st, 0))
878 return NULL;
879
880 fd = openat(root_fd, cachefile, O_RDONLY);
881 if (fd == -1)
882 return NULL;
883
884 /* cache these values so we only map/unmap the cache file once */
885 ldcache_size = st.st_size;
886 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
887 close(fd);
888
889 if (ldcache == MAP_FAILED) {
890 ldcache = NULL;
891 return NULL;
892 }
893
894 if (memcmp(header->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN) ||
895 memcmp(header->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
896 {
897 munmap(ldcache, ldcache_size);
898 ldcache = NULL;
899 return NULL;
900 }
901 } else
902 header = ldcache;
903
904 libent = ldcache + sizeof(header_t);
905 strs = (char *) &libent[header->nlibs];
906
907 for (fd = 0; fd < header->nlibs; ++fd) {
908 /* This should be more fine grained, but for now we assume that
909 * diff arches will not be cached together, and we ignore the
910 * the different multilib mips cases.
911 */
912 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
913 continue;
914 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
915 continue;
916
917 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
918 continue;
919
920 /* Return first hit because that is how the ldso rolls */
921 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
922 break;
923 }
924
925 return buf;
926}
927
928#elif defined(__NetBSD__)
929static char *lookup_cache_lib(elfobj *elf, const char *fname)
930{
931 static char buf[__PAX_UTILS_PATH_MAX] = "";
932 static struct stat st;
933 size_t n;
934 char *ldpath;
935
936 array_for_each(ldpath, n, ldpath) {
937 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", ldpath, fname) >= sizeof(buf))
938 continue; /* if the pathname is too long, or something went wrong, ignore */
939
940 if (stat(buf, &st) != 0)
941 continue; /* if the lib doesn't exist in *ldpath, look further */
942
943 /* NetBSD doesn't actually do sanity checks, it just loads the file
944 * and if that doesn't work, continues looking in other directories.
945 * This cannot easily be safely emulated, unfortunately. For now,
946 * just assume that if it exists, it's a valid library. */
947
948 return buf;
949 }
950
951 /* not found in any path */
952 return NULL;
953}
954#else
955#ifdef __ELF__
956#warning Cache support not implemented for your target
957#endif
958static char *lookup_cache_lib(elfobj *elf, const char *fname)
959{
960 return NULL;
961}
962#endif
963
964static char *lookup_config_lib(const char *fname)
965{
966 static char buf[__PAX_UTILS_PATH_MAX] = "";
967 const char *ldpath;
968 size_t n;
969
970 array_for_each(ldpaths, n, ldpath) {
971 snprintf(buf, sizeof(buf), "%s/%s", root_rel_path(ldpath), fname);
972 if (faccessat(root_fd, buf, F_OK, AT_SYMLINK_NOFOLLOW) == 0)
973 return buf;
974 }
975
976 return NULL;
977}
978
450static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len) 979static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
451{ 980{
452 unsigned long i; 981 unsigned long i;
453 char *needed; 982 char *needed;
454 void *strtbl_void; 983 void *strtbl_void;
984 char *p;
455 985
986 /*
987 * -n -> op==0 -> print all
988 * -N -> op==1 -> print requested
989 */
456 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL; 990 if ((op == 0 && !show_needed) || (op == 1 && !find_lib))
991 return NULL;
457 992
458 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 993 strtbl_void = elf_findsecbyname(elf, ".dynstr");
459 994
460 if (elf->phdr && strtbl_void) { 995 if (elf->phdr && strtbl_void) {
461#define SHOW_NEEDED(B) \ 996#define SHOW_NEEDED(B) \
463 Elf ## B ## _Dyn *dyn; \ 998 Elf ## B ## _Dyn *dyn; \
464 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 999 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
465 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 1000 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
466 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 1001 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
467 Elf ## B ## _Off offset; \ 1002 Elf ## B ## _Off offset; \
1003 size_t matched = 0; \
1004 /* Walk all the program headers to find the PT_DYNAMIC */ \
468 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 1005 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
469 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 1006 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) \
1007 continue; \
470 offset = EGET(phdr[i].p_offset); \ 1008 offset = EGET(phdr[i].p_offset); \
471 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 1009 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
1010 continue; \
1011 /* Walk all the dynamic tags to find NEEDED entries */ \
472 dyn = DYN ## B (elf->data + offset); \ 1012 dyn = DYN ## B (elf->vdata + offset); \
473 while (EGET(dyn->d_tag) != DT_NULL) { \ 1013 while (EGET(dyn->d_tag) != DT_NULL) { \
474 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 1014 if (EGET(dyn->d_tag) == DT_NEEDED) { \
475 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 1015 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
476 if (offset >= (Elf ## B ## _Off)elf->len) { \ 1016 if (offset >= (Elf ## B ## _Off)elf->len) { \
477 ++dyn; \ 1017 ++dyn; \
478 continue; \ 1018 continue; \
479 } \ 1019 } \
480 needed = (char*)(elf->data + offset); \ 1020 needed = elf->data + offset; \
481 if (op == 0) { \ 1021 if (op == 0) { \
1022 /* -n -> print all entries */ \
482 if (!be_wewy_wewy_quiet) { \ 1023 if (!be_wewy_wewy_quiet) { \
483 if (*found_needed) xchrcat(ret, ',', ret_len); \ 1024 if (*found_needed) xchrcat(ret, ',', ret_len); \
1025 if (use_ldpath) { \
1026 if ((p = lookup_config_lib(needed)) != NULL) \
1027 needed = p; \
1028 } else if (use_ldcache) { \
1029 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
1030 needed = p; \
1031 } \
484 xstrcat(ret, needed, ret_len); \ 1032 xstrcat(ret, needed, ret_len); \
485 } \ 1033 } \
486 *found_needed = 1; \ 1034 *found_needed = 1; \
487 } else { \ 1035 } else { \
488 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \ 1036 /* -N -> print matching entries */ \
1037 size_t n; \
1038 const char *find_lib_name; \
1039 \
1040 array_for_each(find_lib_arr, n, find_lib_name) { \
1041 int invert = 1; \
1042 if (find_lib_name[0] == '!') \
1043 invert = 0, ++find_lib_name; \
1044 if (!strcmp(find_lib_name, needed) == invert) \
1045 ++matched; \
1046 } \
1047 \
1048 if (matched == array_cnt(find_lib_arr)) { \
489 *found_lib = 1; \ 1049 *found_lib = 1; \
490 return (be_wewy_wewy_quiet ? NULL : needed); \ 1050 return (be_wewy_wewy_quiet ? NULL : find_lib); \
491 } \ 1051 } \
492 } \ 1052 } \
493 } \ 1053 } \
494 ++dyn; \ 1054 ++dyn; \
495 } \ 1055 } \
517 *found_interp = 1; \ 1077 *found_interp = 1; \
518 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \ 1078 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
519 } 1079 }
520 SHOW_INTERP(32) 1080 SHOW_INTERP(32)
521 SHOW_INTERP(64) 1081 SHOW_INTERP(64)
1082 } else {
1083 /* Walk all the program headers to find the PT_INTERP */
1084#define SHOW_PT_INTERP(B) \
1085 if (elf->elf_class == ELFCLASS ## B) { \
1086 unsigned long i; \
1087 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1088 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1089 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1090 if (EGET(phdr[i].p_type) != PT_INTERP) \
1091 continue; \
1092 *found_interp = 1; \
1093 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(phdr[i].p_offset)); \
1094 } \
522 } 1095 }
1096 SHOW_PT_INTERP(32)
1097 SHOW_PT_INTERP(64)
1098 }
1099
523 return NULL; 1100 return NULL;
524} 1101}
525static char *scanelf_file_bind(elfobj *elf, char *found_bind) 1102static const char *scanelf_file_bind(elfobj *elf, char *found_bind)
526{ 1103{
527 unsigned long i; 1104 unsigned long i;
528 struct stat s; 1105 struct stat s;
1106 bool dynamic = false;
529 1107
530 if (!show_bind) return NULL; 1108 if (!show_bind) return NULL;
531 if (!elf->phdr) return NULL; 1109 if (!elf->phdr) return NULL;
532 1110
533#define SHOW_BIND(B) \ 1111#define SHOW_BIND(B) \
535 Elf ## B ## _Dyn *dyn; \ 1113 Elf ## B ## _Dyn *dyn; \
536 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 1114 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
537 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 1115 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
538 Elf ## B ## _Off offset; \ 1116 Elf ## B ## _Off offset; \
539 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 1117 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
540 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 1118 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1119 dynamic = true; \
541 offset = EGET(phdr[i].p_offset); \ 1120 offset = EGET(phdr[i].p_offset); \
542 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 1121 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
543 dyn = DYN ## B (elf->data + offset); \ 1122 dyn = DYN ## B (elf->vdata + offset); \
544 while (EGET(dyn->d_tag) != DT_NULL) { \ 1123 while (EGET(dyn->d_tag) != DT_NULL) { \
545 if (EGET(dyn->d_tag) == DT_BIND_NOW || \ 1124 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
546 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \ 1125 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
547 { \ 1126 { \
548 if (be_quiet) return NULL; \ 1127 if (be_quiet) return NULL; \
556 SHOW_BIND(32) 1135 SHOW_BIND(32)
557 SHOW_BIND(64) 1136 SHOW_BIND(64)
558 1137
559 if (be_wewy_wewy_quiet) return NULL; 1138 if (be_wewy_wewy_quiet) return NULL;
560 1139
1140 /* don't output anything if quiet mode and the ELF is static or not setuid */
561 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) { 1141 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
562 return NULL; 1142 return NULL;
563 } else { 1143 } else {
564 *found_bind = 1; 1144 *found_bind = 1;
565 return (char *) "LAZY"; 1145 return dynamic ? "LAZY" : "STATIC";
566 } 1146 }
567} 1147}
568static char *scanelf_file_soname(elfobj *elf, char *found_soname) 1148static char *scanelf_file_soname(elfobj *elf, char *found_soname)
569{ 1149{
570 unsigned long i; 1150 unsigned long i;
582 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 1162 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
583 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 1163 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
584 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 1164 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
585 Elf ## B ## _Off offset; \ 1165 Elf ## B ## _Off offset; \
586 /* only look for soname in shared objects */ \ 1166 /* only look for soname in shared objects */ \
587 if (ehdr->e_type != ET_DYN) \ 1167 if (EGET(ehdr->e_type) != ET_DYN) \
588 return NULL; \ 1168 return NULL; \
589 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 1169 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
590 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 1170 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
591 offset = EGET(phdr[i].p_offset); \ 1171 offset = EGET(phdr[i].p_offset); \
592 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 1172 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
593 dyn = DYN ## B (elf->data + offset); \ 1173 dyn = DYN ## B (elf->vdata + offset); \
594 while (EGET(dyn->d_tag) != DT_NULL) { \ 1174 while (EGET(dyn->d_tag) != DT_NULL) { \
595 if (EGET(dyn->d_tag) == DT_SONAME) { \ 1175 if (EGET(dyn->d_tag) == DT_SONAME) { \
596 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 1176 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
597 if (offset >= (Elf ## B ## _Off)elf->len) { \ 1177 if (offset >= (Elf ## B ## _Off)elf->len) { \
598 ++dyn; \ 1178 ++dyn; \
599 continue; \ 1179 continue; \
600 } \ 1180 } \
601 soname = (char*)(elf->data + offset); \ 1181 soname = elf->data + offset; \
602 *found_soname = 1; \ 1182 *found_soname = 1; \
603 return (be_wewy_wewy_quiet ? NULL : soname); \ 1183 return (be_wewy_wewy_quiet ? NULL : soname); \
604 } \ 1184 } \
605 ++dyn; \ 1185 ++dyn; \
606 } \ 1186 } \
609 SHOW_SONAME(64) 1189 SHOW_SONAME(64)
610 } 1190 }
611 1191
612 return NULL; 1192 return NULL;
613} 1193}
1194
1195/*
1196 * We support the symbol form:
1197 * [%[modifiers]%][[+-]<symbol name>][,[.....]]
1198 * If the symbol name is empty, then all symbols are matched.
1199 * If the symbol name is a glob ("*"), then all symbols are dumped (debug).
1200 * Do not rely on this output format at all.
1201 * Otherwise the symbol name is used to search (either regex or string compare).
1202 * If the first char of the symbol name is a plus ("+"), then only match
1203 * defined symbols. If it's a minus ("-"), only match undefined symbols.
1204 * Putting modifiers in between the percent signs allows for more in depth
1205 * filters. There are groups of modifiers. If you don't specify a member
1206 * of a group, then all types in that group are matched. The current
1207 * groups and their types are:
1208 * STT group: STT_NOTYPE:n STT_OBJECT:o STT_FUNC:f STT_FILE:F
1209 * STB group: STB_LOCAL:l STB_GLOBAL:g STB_WEAK:w
1210 * STV group: STV_DEFAULT:p STV_INTERNAL:i STV_HIDDEN:h STV_PROTECTED:P
1211 * SHN group: SHN_UNDEF:u SHN_ABS:a SHN_COMMON:c {defined}:d
1212 * The "defined" value in the SHN group does not correspond to a SHN_xxx define.
1213 * You can search for multiple symbols at once by seperating with a comma (",").
1214 *
1215 * Some examples:
1216 * ELFs with a weak function "foo":
1217 * scanelf -s %wf%foo <ELFs>
1218 * ELFs that define the symbol "main":
1219 * scanelf -s +main <ELFs>
1220 * scanelf -s %d%main <ELFs>
1221 * ELFs that refer to the undefined symbol "brk":
1222 * scanelf -s -brk <ELFs>
1223 * scanelf -s %u%brk <ELFs>
1224 * All global defined objects in an ELF:
1225 * scanelf -s %ogd% <ELF>
1226 */
1227static void
1228scanelf_match_symname(elfobj *elf, char *found_sym, char **ret, size_t *ret_len, const char *symname,
1229 unsigned int stt, unsigned int stb, unsigned int stv, unsigned int shn, unsigned long size)
1230{
1231 const char *this_sym;
1232 size_t n;
1233
1234 array_for_each(find_sym_arr, n, this_sym) {
1235 bool inc_notype, inc_object, inc_func, inc_file,
1236 inc_local, inc_global, inc_weak,
1237 inc_visdef, inc_intern, inc_hidden, inc_prot,
1238 inc_def, inc_undef, inc_abs, inc_common;
1239
1240 /* symbol selection! */
1241 inc_notype = inc_object = inc_func = inc_file =
1242 inc_local = inc_global = inc_weak =
1243 inc_visdef = inc_intern = inc_hidden = inc_prot =
1244 inc_def = inc_undef = inc_abs = inc_common =
1245 (*this_sym != '%');
1246
1247 /* parse the contents of %...% */
1248 if (!inc_notype) {
1249 while (*(this_sym++)) {
1250 if (*this_sym == '%') {
1251 ++this_sym;
1252 break;
1253 }
1254 switch (*this_sym) {
1255 case 'n': inc_notype = true; break;
1256 case 'o': inc_object = true; break;
1257 case 'f': inc_func = true; break;
1258 case 'F': inc_file = true; break;
1259 case 'l': inc_local = true; break;
1260 case 'g': inc_global = true; break;
1261 case 'w': inc_weak = true; break;
1262 case 'p': inc_visdef = true; break;
1263 case 'i': inc_intern = true; break;
1264 case 'h': inc_hidden = true; break;
1265 case 'P': inc_prot = true; break;
1266 case 'd': inc_def = true; break;
1267 case 'u': inc_undef = true; break;
1268 case 'a': inc_abs = true; break;
1269 case 'c': inc_common = true; break;
1270 default: err("invalid symbol selector '%c'", *this_sym);
1271 }
1272 }
1273
1274 /* If no types are matched, not match all */
1275 if (!inc_notype && !inc_object && !inc_func && !inc_file)
1276 inc_notype = inc_object = inc_func = inc_file = true;
1277 if (!inc_local && !inc_global && !inc_weak)
1278 inc_local = inc_global = inc_weak = true;
1279 if (!inc_visdef && !inc_intern && !inc_hidden && !inc_prot)
1280 inc_visdef = inc_intern = inc_hidden = inc_prot = true;
1281 if (!inc_def && !inc_undef && !inc_abs && !inc_common)
1282 inc_def = inc_undef = inc_abs = inc_common = true;
1283
1284 /* backwards compat for defined/undefined short hand */
1285 } else if (*this_sym == '+') {
1286 inc_undef = false;
1287 ++this_sym;
1288 } else if (*this_sym == '-') {
1289 inc_def = inc_abs = inc_common = false;
1290 ++this_sym;
1291 }
1292
1293 /* filter symbols */
1294 if ((!inc_notype && stt == STT_NOTYPE ) || \
1295 (!inc_object && stt == STT_OBJECT ) || \
1296 (!inc_func && stt == STT_FUNC ) || \
1297 (!inc_file && stt == STT_FILE ) || \
1298 (!inc_local && stb == STB_LOCAL ) || \
1299 (!inc_global && stb == STB_GLOBAL ) || \
1300 (!inc_weak && stb == STB_WEAK ) || \
1301 (!inc_visdef && stv == STV_DEFAULT ) || \
1302 (!inc_intern && stv == STV_INTERNAL ) || \
1303 (!inc_hidden && stv == STV_HIDDEN ) || \
1304 (!inc_prot && stv == STV_PROTECTED) || \
1305 (!inc_def && shn && shn < SHN_LORESERVE) || \
1306 (!inc_undef && shn == SHN_UNDEF ) || \
1307 (!inc_abs && shn == SHN_ABS ) || \
1308 (!inc_common && shn == SHN_COMMON ))
1309 continue;
1310
1311 if (*this_sym == '*') {
1312 /* a "*" symbol gets you debug output */
1313 printf("%s(%s) %5lX %-15s %-15s %-15s %-15s %s\n",
1314 ((*found_sym == 0) ? "\n\t" : "\t"),
1315 elf->base_filename,
1316 size,
1317 get_elfstttype(stt),
1318 get_elfstbtype(stb),
1319 get_elfstvtype(stv),
1320 get_elfshntype(shn),
1321 symname);
1322 goto matched;
1323
1324 } else {
1325 if (g_match) {
1326 /* regex match the symbol */
1327 if (regexec(find_sym_regex_arr->eles[n], symname, 0, NULL, 0) == REG_NOMATCH)
1328 continue;
1329
1330 } else if (*this_sym) {
1331 /* give empty symbols a "pass", else do a normal compare */
1332 const size_t len = strlen(this_sym);
1333 if (!(strncmp(this_sym, symname, len) == 0 &&
1334 /* Accept unversioned symbol names */
1335 (symname[len] == '\0' || symname[len] == '@')))
1336 continue;
1337 }
1338
1339 if (be_semi_verbose) {
1340 char buf[1024];
1341 snprintf(buf, sizeof(buf), "%lX %s %s",
1342 size,
1343 get_elfstttype(stt),
1344 this_sym);
1345 *ret = xstrdup(buf);
1346 } else {
1347 if (*ret) xchrcat(ret, ',', ret_len);
1348 xstrcat(ret, symname, ret_len);
1349 }
1350
1351 goto matched;
1352 }
1353 }
1354
1355 return;
1356
1357 matched:
1358 *found_sym = 1;
1359}
1360
614static char *scanelf_file_sym(elfobj *elf, char *found_sym) 1361static const char *scanelf_file_sym(elfobj *elf, char *found_sym)
615{ 1362{
616 unsigned long i; 1363 char *ret;
617 void *symtab_void, *strtab_void; 1364 void *symtab_void, *strtab_void;
618 1365
619 if (!find_sym) return NULL; 1366 if (!find_sym) return NULL;
1367 ret = NULL;
620 1368
621 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void); 1369 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
622 1370
623 if (symtab_void && strtab_void) { 1371 if (symtab_void && strtab_void) {
624#define FIND_SYM(B) \ 1372#define FIND_SYM(B) \
625 if (elf->elf_class == ELFCLASS ## B) { \ 1373 if (elf->elf_class == ELFCLASS ## B) { \
626 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 1374 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
627 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 1375 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
628 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 1376 Elf ## B ## _Sym *sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
629 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 1377 Elf ## B ## _Word i, cnt = EGET(symtab->sh_entsize); \
630 char *symname; \ 1378 char *symname; \
1379 size_t ret_len = 0; \
1380 if (cnt) \
1381 cnt = EGET(symtab->sh_size) / cnt; \
631 for (i = 0; i < cnt; ++i) { \ 1382 for (i = 0; i < cnt; ++i) { \
1383 if ((void*)sym > elf->data_end) { \
1384 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1385 goto break_out; \
1386 } \
632 if (sym->st_name) { \ 1387 if (sym->st_name) { \
1388 /* make sure the symbol name is in acceptable memory range */ \
633 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 1389 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
634 if (*find_sym == '*') { \ 1390 if ((void*)symname > elf->data_end) { \
635 printf("%s(%s) %5lX %15s %s\n", \ 1391 warnf("%s: corrupt ELF symbols", elf->filename); \
636 ((*found_sym == 0) ? "\n\t" : "\t"), \ 1392 ++sym; \
637 elf->base_filename, \ 1393 continue; \
638 (long)sym->st_size, \ 1394 } \
639 (char *)get_elfstttype(sym->st_info), \ 1395 scanelf_match_symname(elf, found_sym, \
640 symname); \ 1396 &ret, &ret_len, symname, \
641 *found_sym = 1; \ 1397 ELF##B##_ST_TYPE(EGET(sym->st_info)), \
642 } else if ((strcmp(find_sym, symname) == 0) || \ 1398 ELF##B##_ST_BIND(EGET(sym->st_info)), \
643 (strcmp(symname, versioned_symname) == 0)) \ 1399 ELF##B##_ST_VISIBILITY(EGET(sym->st_other)), \
644 (*found_sym)++; \ 1400 EGET(sym->st_shndx), \
1401 /* st_size can be 64bit, but no one is really that big, so screw em */ \
1402 EGET(sym->st_size)); \
645 } \ 1403 } \
646 ++sym; \ 1404 ++sym; \
647 } } 1405 } \
1406 }
648 FIND_SYM(32) 1407 FIND_SYM(32)
649 FIND_SYM(64) 1408 FIND_SYM(64)
650 } 1409 }
651 1410
1411break_out:
652 if (be_wewy_wewy_quiet) return NULL; 1412 if (be_wewy_wewy_quiet) return NULL;
653 1413
654 if (*find_sym != '*' && *found_sym) 1414 if (*find_sym != '*' && *found_sym)
655 return find_sym; 1415 return ret;
656 if (be_quiet) 1416 if (be_quiet)
657 return NULL; 1417 return NULL;
658 else 1418 else
659 return (char *)" - "; 1419 return " - ";
660} 1420}
1421
1422static const char *scanelf_file_sections(elfobj *elf, char *found_section)
1423{
1424 if (!find_section)
1425 return NULL;
1426
1427#define FIND_SECTION(B) \
1428 if (elf->elf_class == ELFCLASS ## B) { \
1429 size_t matched, n; \
1430 int invert; \
1431 const char *section_name; \
1432 Elf ## B ## _Shdr *section; \
1433 \
1434 matched = 0; \
1435 array_for_each(find_section_arr, n, section_name) { \
1436 invert = (*section_name == '!' ? 1 : 0); \
1437 section = SHDR ## B (elf_findsecbyname(elf, section_name + invert)); \
1438 if ((section == NULL && invert) || (section != NULL && !invert)) \
1439 ++matched; \
1440 } \
1441 \
1442 if (matched == array_cnt(find_section_arr)) \
1443 *found_section = 1; \
1444 }
1445 FIND_SECTION(32)
1446 FIND_SECTION(64)
1447
1448 if (be_wewy_wewy_quiet)
1449 return NULL;
1450
1451 if (*found_section)
1452 return find_section;
1453
1454 if (be_quiet)
1455 return NULL;
1456 else
1457 return " - ";
1458}
1459
661/* scan an elf file and show all the fun stuff */ 1460/* scan an elf file and show all the fun stuff */
662#define prints(str) write(fileno(stdout), str, strlen(str)) 1461#define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
663static void scanelf_file(const char *filename) 1462static int scanelf_elfobj(elfobj *elf)
664{ 1463{
665 unsigned long i; 1464 unsigned long i;
666 char found_pax, found_phdr, found_relro, found_load, found_textrel, 1465 char found_pax, found_phdr, found_relro, found_load, found_textrel,
667 found_rpath, found_needed, found_interp, found_bind, found_soname, 1466 found_rpath, found_needed, found_interp, found_bind, found_soname,
668 found_sym, found_lib, found_file, found_textrels; 1467 found_sym, found_lib, found_file, found_textrels, found_section;
669 elfobj *elf;
670 struct stat st;
671 static char *out_buffer = NULL; 1468 static char *out_buffer = NULL;
672 static size_t out_len; 1469 static size_t out_len;
673 1470
674 /* make sure 'filename' exists */
675 if (lstat(filename, &st) == -1) {
676 if (be_verbose > 2) printf("%s: does not exist\n", filename);
677 return;
678 }
679 /* always handle regular files and handle symlinked files if no -y */
680 if (S_ISLNK(st.st_mode)) {
681 if (!scan_symlink) return;
682 stat(filename, &st);
683 }
684 if (!S_ISREG(st.st_mode)) {
685 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
686 return;
687 }
688
689 found_pax = found_phdr = found_relro = found_load = found_textrel = \ 1471 found_pax = found_phdr = found_relro = found_load = found_textrel = \
690 found_rpath = found_needed = found_interp = found_bind = found_soname = \ 1472 found_rpath = found_needed = found_interp = found_bind = found_soname = \
691 found_sym = found_lib = found_file = found_textrels = 0; 1473 found_sym = found_lib = found_file = found_textrels = found_section = 0;
692 1474
693 /* verify this is real ELF */
694 if ((elf = readelf(filename)) == NULL) {
695 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
696 return;
697 }
698
699 if (be_verbose > 1) 1475 if (be_verbose > 2)
700 printf("%s: scanning file {%s,%s}\n", filename, 1476 printf("%s: scanning file {%s,%s}\n", elf->filename,
701 get_elfeitype(EI_CLASS, elf->elf_class), 1477 get_elfeitype(EI_CLASS, elf->elf_class),
702 get_elfeitype(EI_DATA, elf->data[EI_DATA])); 1478 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
703 else if (be_verbose) 1479 else if (be_verbose > 1)
704 printf("%s: scanning file\n", filename); 1480 printf("%s: scanning file\n", elf->filename);
705 1481
706 /* init output buffer */ 1482 /* init output buffer */
707 if (!out_buffer) { 1483 if (!out_buffer) {
708 out_len = sizeof(char) * 80; 1484 out_len = sizeof(char) * 80;
709 out_buffer = (char*)xmalloc(out_len); 1485 out_buffer = xmalloc(out_len);
710 } 1486 }
711 *out_buffer = '\0'; 1487 *out_buffer = '\0';
712 1488
713 /* show the header */ 1489 /* show the header */
714 if (!be_quiet && show_banner) { 1490 if (!be_quiet && show_banner) {
715 for (i = 0; out_format[i]; ++i) { 1491 for (i = 0; out_format[i]; ++i) {
716 if (!IS_MODIFIER(out_format[i])) continue; 1492 if (!IS_MODIFIER(out_format[i])) continue;
717 1493
718 switch (out_format[++i]) { 1494 switch (out_format[++i]) {
1495 case '+': break;
719 case '%': break; 1496 case '%': break;
720 case '#': break; 1497 case '#': break;
721 case 'F': 1498 case 'F':
722 case 'p': 1499 case 'p':
723 case 'f': prints("FILE "); found_file = 1; break; 1500 case 'f': prints("FILE "); found_file = 1; break;
724 case 'o': prints(" TYPE "); break; 1501 case 'o': prints(" TYPE "); break;
725 case 'x': prints(" PAX "); break; 1502 case 'x': prints(" PAX "); break;
726 case 'e': prints("STK/REL/PTL "); break; 1503 case 'e': prints("STK/REL/PTL "); break;
727 case 't': prints("TEXTREL "); break; 1504 case 't': prints("TEXTREL "); break;
728 case 'r': prints("RPATH "); break; 1505 case 'r': prints("RPATH "); break;
1506 case 'M': prints("CLASS "); break;
1507 case 'l':
729 case 'n': prints("NEEDED "); break; 1508 case 'n': prints("NEEDED "); break;
730 case 'i': prints("INTERP "); break; 1509 case 'i': prints("INTERP "); break;
731 case 'b': prints("BIND "); break; 1510 case 'b': prints("BIND "); break;
1511 case 'Z': prints("SIZE "); break;
732 case 'S': prints("SONAME "); break; 1512 case 'S': prints("SONAME "); break;
733 case 's': prints("SYM "); break; 1513 case 's': prints("SYM "); break;
734 case 'N': prints("LIB "); break; 1514 case 'N': prints("LIB "); break;
735 case 'T': prints("TEXTRELS "); break; 1515 case 'T': prints("TEXTRELS "); break;
1516 case 'k': prints("SECTION "); break;
1517 case 'a': prints("ARCH "); break;
1518 case 'I': prints("OSABI "); break;
1519 case 'Y': prints("EABI "); break;
1520 case 'O': prints("PERM "); break;
1521 case 'D': prints("ENDIAN "); break;
736 default: warnf("'%c' has no title ?", out_format[i]); 1522 default: warnf("'%c' has no title ?", out_format[i]);
737 } 1523 }
738 } 1524 }
739 if (!found_file) prints("FILE "); 1525 if (!found_file) prints("FILE ");
740 prints("\n"); 1526 prints("\n");
744 1530
745 /* dump all the good stuff */ 1531 /* dump all the good stuff */
746 for (i = 0; out_format[i]; ++i) { 1532 for (i = 0; out_format[i]; ++i) {
747 const char *out; 1533 const char *out;
748 const char *tmp; 1534 const char *tmp;
749 1535 static char ubuf[sizeof(unsigned long)*2];
750 /* make sure we trim leading spaces in quiet mode */
751 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
752 *out_buffer = '\0';
753
754 if (!IS_MODIFIER(out_format[i])) { 1536 if (!IS_MODIFIER(out_format[i])) {
755 xchrcat(&out_buffer, out_format[i], &out_len); 1537 xchrcat(&out_buffer, out_format[i], &out_len);
756 continue; 1538 continue;
757 } 1539 }
758 1540
759 out = NULL; 1541 out = NULL;
760 be_wewy_wewy_quiet = (out_format[i] == '#'); 1542 be_wewy_wewy_quiet = (out_format[i] == '#');
1543 be_semi_verbose = (out_format[i] == '+');
761 switch (out_format[++i]) { 1544 switch (out_format[++i]) {
1545 case '+':
762 case '%': 1546 case '%':
763 case '#': 1547 case '#':
764 xchrcat(&out_buffer, out_format[i], &out_len); break; 1548 xchrcat(&out_buffer, out_format[i], &out_len); break;
765 case 'F': 1549 case 'F':
766 found_file = 1; 1550 found_file = 1;
767 if (be_wewy_wewy_quiet) break; 1551 if (be_wewy_wewy_quiet) break;
768 xstrcat(&out_buffer, filename, &out_len); 1552 xstrcat(&out_buffer, elf->filename, &out_len);
769 break; 1553 break;
770 case 'p': 1554 case 'p':
771 found_file = 1; 1555 found_file = 1;
772 if (be_wewy_wewy_quiet) break; 1556 if (be_wewy_wewy_quiet) break;
773 tmp = filename; 1557 tmp = elf->filename;
774 if (search_path) { 1558 if (search_path) {
775 ssize_t len_search = strlen(search_path); 1559 ssize_t len_search = strlen(search_path);
776 ssize_t len_file = strlen(filename); 1560 ssize_t len_file = strlen(elf->filename);
777 if (!strncmp(filename, search_path, len_search) && \ 1561 if (!strncmp(elf->filename, search_path, len_search) && \
778 len_file > len_search) 1562 len_file > len_search)
779 tmp += len_search; 1563 tmp += len_search;
780 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++; 1564 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
781 } 1565 }
782 xstrcat(&out_buffer, tmp, &out_len); 1566 xstrcat(&out_buffer, tmp, &out_len);
783 break; 1567 break;
784 case 'f': 1568 case 'f':
785 found_file = 1; 1569 found_file = 1;
786 if (be_wewy_wewy_quiet) break; 1570 if (be_wewy_wewy_quiet) break;
787 tmp = strrchr(filename, '/'); 1571 tmp = strrchr(elf->filename, '/');
788 tmp = (tmp == NULL ? filename : tmp+1); 1572 tmp = (tmp == NULL ? elf->filename : tmp+1);
789 xstrcat(&out_buffer, tmp, &out_len); 1573 xstrcat(&out_buffer, tmp, &out_len);
790 break; 1574 break;
791 case 'o': out = get_elfetype(elf); break; 1575 case 'o': out = get_elfetype(elf); break;
792 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1576 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
793 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break; 1577 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
794 case 't': out = scanelf_file_textrel(elf, &found_textrel); break; 1578 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
795 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break; 1579 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
796 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break; 1580 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1581 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1582 case 'D': out = get_endian(elf); break;
1583 case 'O': out = strfileperms(elf->filename); break;
797 case 'n': 1584 case 'n':
798 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break; 1585 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
799 case 'i': out = scanelf_file_interp(elf, &found_interp); break; 1586 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
800 case 'b': out = scanelf_file_bind(elf, &found_bind); break; 1587 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
801 case 'S': out = scanelf_file_soname(elf, &found_soname); break; 1588 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
802 case 's': out = scanelf_file_sym(elf, &found_sym); break; 1589 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1590 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1591 case 'a': out = get_elfemtype(elf); break;
1592 case 'I': out = get_elfosabi(elf); break;
1593 case 'Y': out = get_elf_eabi(elf); break;
1594 case 'Z': snprintf(ubuf, sizeof(ubuf), "%lu", (unsigned long)elf->len); out = ubuf; break;;
803 default: warnf("'%c' has no scan code?", out_format[i]); 1595 default: warnf("'%c' has no scan code?", out_format[i]);
804 } 1596 }
1597 if (out)
805 if (out) xstrcat(&out_buffer, out, &out_len); 1598 xstrcat(&out_buffer, out, &out_len);
806 } 1599 }
807 1600
808#define FOUND_SOMETHING() \ 1601#define FOUND_SOMETHING() \
809 (found_pax || found_phdr || found_relro || found_load || found_textrel || \ 1602 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
810 found_rpath || found_needed || found_interp || found_bind || \ 1603 found_rpath || found_needed || found_interp || found_bind || \
811 found_soname || found_sym || found_lib || found_textrels) 1604 found_soname || found_sym || found_lib || found_textrels || found_section )
812 1605
813 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) { 1606 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
814 xchrcat(&out_buffer, ' ', &out_len); 1607 xchrcat(&out_buffer, ' ', &out_len);
815 xstrcat(&out_buffer, filename, &out_len); 1608 xstrcat(&out_buffer, elf->filename, &out_len);
816 } 1609 }
817 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) { 1610 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
818 puts(out_buffer); 1611 puts(out_buffer);
819 fflush(stdout); 1612 fflush(stdout);
820 } 1613 }
821 1614
1615 return 0;
1616}
1617
1618/* scan a single elf */
1619static int scanelf_elf(const char *filename, int fd, size_t len)
1620{
1621 int ret = 1;
1622 size_t n;
1623 const char *match_etype;
1624 elfobj *elf;
1625
1626 /* Verify this is a real ELF */
1627 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1628 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1629 return 2;
1630 }
1631
1632 /* Possibly filter based on ELF bitness */
1633 switch (match_bits) {
1634 case 32:
1635 if (elf->elf_class != ELFCLASS32)
1636 goto done;
1637 break;
1638 case 64:
1639 if (elf->elf_class != ELFCLASS64)
1640 goto done;
1641 break;
1642 }
1643
1644 /* Possibly filter based on the ELF's e_type field */
1645 array_for_each(match_etypes, n, match_etype)
1646 if (etype_lookup(match_etype) == get_etype(elf))
1647 goto scanit;
1648 if (array_cnt(match_etypes))
1649 goto done;
1650
1651 scanit:
1652 ret = scanelf_elfobj(elf);
1653
1654 done:
822 unreadelf(elf); 1655 unreadelf(elf);
1656 return ret;
1657}
1658
1659/* scan an archive of elfs */
1660static int scanelf_archive(const char *filename, int fd, size_t len)
1661{
1662 archive_handle *ar;
1663 archive_member *m;
1664 char *ar_buffer;
1665 elfobj *elf;
1666
1667 ar = ar_open_fd(filename, fd);
1668 if (ar == NULL)
1669 return 1;
1670
1671 ar_buffer = mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1672 while ((m = ar_next(ar)) != NULL) {
1673 off_t cur_pos = lseek(fd, 0, SEEK_CUR);
1674 if (cur_pos == -1)
1675 errp("lseek() failed");
1676 elf = readelf_buffer(m->name, ar_buffer + cur_pos, m->size);
1677 if (elf) {
1678 scanelf_elfobj(elf);
1679 unreadelf(elf);
1680 }
1681 }
1682 munmap(ar_buffer, len);
1683
1684 return 0;
1685}
1686/* scan a file which may be an elf or an archive or some other magical beast */
1687static int scanelf_fileat(int dir_fd, const char *filename, const struct stat *st_cache)
1688{
1689 const struct stat *st = st_cache;
1690 struct stat symlink_st;
1691 int fd;
1692
1693 /* always handle regular files and handle symlinked files if no -y */
1694 if (S_ISLNK(st->st_mode)) {
1695 if (!scan_symlink)
1696 return 1;
1697 fstatat(dir_fd, filename, &symlink_st, 0);
1698 st = &symlink_st;
1699 }
1700
1701 if (!S_ISREG(st->st_mode)) {
1702 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1703 return 1;
1704 }
1705
1706 if (match_perms) {
1707 if ((st->st_mode | match_perms) != st->st_mode)
1708 return 1;
1709 }
1710 fd = openat(dir_fd, filename, (fix_elf ? O_RDWR : O_RDONLY) | O_CLOEXEC);
1711 if (fd == -1) {
1712 if (fix_elf && errno == ETXTBSY)
1713 warnp("%s: could not fix", filename);
1714 else if (be_verbose > 2)
1715 printf("%s: skipping file: %s\n", filename, strerror(errno));
1716 return 1;
1717 }
1718
1719 if (scanelf_elf(filename, fd, st->st_size) == 2) {
1720 /* if it isn't an ELF, maybe it's an .a archive */
1721 if (scan_archives)
1722 scanelf_archive(filename, fd, st->st_size);
1723
1724 /*
1725 * unreadelf() implicitly closes its fd, so only close it
1726 * when we are returning it in the non-ELF case
1727 */
1728 close(fd);
1729 }
1730
1731 return 0;
823} 1732}
824 1733
825/* scan a directory for ET_EXEC files and print when we find one */ 1734/* scan a directory for ET_EXEC files and print when we find one */
826static void scanelf_dir(const char *path) 1735static int scanelf_dirat(int dir_fd, const char *path)
827{ 1736{
828 register DIR *dir; 1737 register DIR *dir;
829 register struct dirent *dentry; 1738 register struct dirent *dentry;
830 struct stat st_top, st; 1739 struct stat st_top, st;
831 char buf[_POSIX_PATH_MAX]; 1740 char buf[__PAX_UTILS_PATH_MAX], *subpath;
832 size_t pathlen = 0, len = 0; 1741 size_t pathlen = 0, len = 0;
1742 int ret = 0;
1743 int subdir_fd;
833 1744
834 /* make sure path exists */ 1745 /* make sure path exists */
835 if (lstat(path, &st_top) == -1) { 1746 if (fstatat(dir_fd, path, &st_top, AT_SYMLINK_NOFOLLOW) == -1) {
836 if (be_verbose > 2) printf("%s: does not exist\n", path); 1747 if (be_verbose > 2) printf("%s: does not exist\n", path);
837 return; 1748 return 1;
838 } 1749 }
839 1750
840 /* ok, if it isn't a directory, assume we can open it */ 1751 /* ok, if it isn't a directory, assume we can open it */
841 if (!S_ISDIR(st_top.st_mode)) { 1752 if (!S_ISDIR(st_top.st_mode))
842 scanelf_file(path); 1753 return scanelf_fileat(dir_fd, path, &st_top);
843 return;
844 }
845 1754
846 /* now scan the dir looking for fun stuff */ 1755 /* now scan the dir looking for fun stuff */
847 if ((dir = opendir(path)) == NULL) { 1756 subdir_fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
848 warnf("could not opendir %s: %s", path, strerror(errno)); 1757 if (subdir_fd == -1)
1758 dir = NULL;
1759 else
1760 dir = fdopendir(subdir_fd);
1761 if (dir == NULL) {
1762 if (subdir_fd != -1)
1763 close(subdir_fd);
1764 else if (be_verbose > 2)
1765 printf("%s: skipping dir: %s\n", path, strerror(errno));
849 return; 1766 return 1;
850 } 1767 }
851 if (be_verbose) printf("%s: scanning dir\n", path); 1768 if (be_verbose > 1) printf("%s: scanning dir\n", path);
852 1769
853 pathlen = strlen(path); 1770 subpath = stpcpy(buf, path);
1771 if (subpath[-1] != '/')
1772 *subpath++ = '/';
1773 pathlen = subpath - buf;
854 while ((dentry = readdir(dir))) { 1774 while ((dentry = readdir(dir))) {
855 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1775 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
856 continue; 1776 continue;
1777
1778 if (fstatat(subdir_fd, dentry->d_name, &st, AT_SYMLINK_NOFOLLOW) == -1)
1779 continue;
1780
857 len = (pathlen + 1 + strlen(dentry->d_name) + 1); 1781 len = strlen(dentry->d_name);
858 if (len >= sizeof(buf)) { 1782 if (len + pathlen + 1 >= sizeof(buf)) {
859 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path, 1783 warnf("Skipping '%s%s': len > sizeof(buf); %zu > %zu\n",
860 (unsigned long)len, (unsigned long)sizeof(buf)); 1784 path, dentry->d_name, len + pathlen + 1, sizeof(buf));
861 continue; 1785 continue;
862 } 1786 }
863 sprintf(buf, "%s/%s", path, dentry->d_name); 1787 memcpy(subpath, dentry->d_name, len);
864 if (lstat(buf, &st) != -1) { 1788 subpath[len] = '\0';
1789
865 if (S_ISREG(st.st_mode)) 1790 if (S_ISREG(st.st_mode))
866 scanelf_file(buf); 1791 ret = scanelf_fileat(dir_fd, buf, &st);
867 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1792 else if (dir_recurse && S_ISDIR(st.st_mode)) {
868 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1793 if (dir_crossmount || (st_top.st_dev == st.st_dev))
869 scanelf_dir(buf); 1794 ret = scanelf_dirat(dir_fd, buf);
870 }
871 } 1795 }
872 } 1796 }
873 closedir(dir); 1797 closedir(dir);
874}
875 1798
1799 return ret;
1800}
1801static int scanelf_dir(const char *path)
1802{
1803 return scanelf_dirat(root_fd, root_rel_path(path));
1804}
1805
876static int scanelf_from_file(char *filename) 1806static int scanelf_from_file(const char *filename)
877{ 1807{
878 FILE *fp = NULL; 1808 FILE *fp;
879 char *p; 1809 char *p, *path;
880 char path[_POSIX_PATH_MAX]; 1810 size_t len;
1811 int ret;
881 1812
882 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL)) 1813 if (strcmp(filename, "-") == 0)
883 fp = stdin; 1814 fp = stdin;
884 else if ((fp = fopen(filename, "r")) == NULL) 1815 else if ((fp = fopen(filename, "r")) == NULL)
885 return 1; 1816 return 1;
886 1817
887 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1818 path = NULL;
1819 len = 0;
1820 ret = 0;
1821 while (getline(&path, &len, fp) != -1) {
888 if ((p = strchr(path, '\n')) != NULL) 1822 if ((p = strchr(path, '\n')) != NULL)
889 *p = 0; 1823 *p = 0;
890 search_path = path; 1824 search_path = path;
891 scanelf_dir(path); 1825 ret = scanelf_dir(path);
892 } 1826 }
1827 free(path);
1828
893 if (fp != stdin) 1829 if (fp != stdin)
894 fclose(fp); 1830 fclose(fp);
1831
895 return 0; 1832 return ret;
896} 1833}
897 1834
898static void load_ld_so_conf() 1835#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1836
1837static int _load_ld_cache_config(const char *fname)
899{ 1838{
900 FILE *fp = NULL; 1839 FILE *fp = NULL;
901 char *p; 1840 char *p, *path;
902 char path[_POSIX_PATH_MAX]; 1841 size_t len;
903 int i = 0; 1842 int curr_fd = -1;
904 1843
905 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1844 fp = fopenat_r(root_fd, root_rel_path(fname));
1845 if (fp == NULL)
906 return; 1846 return -1;
907 1847
908 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1848 path = NULL;
909 if (*path != '/') 1849 len = 0;
910 continue; 1850 while (getline(&path, &len, fp) != -1) {
911
912 if ((p = strrchr(path, '\r')) != NULL) 1851 if ((p = strrchr(path, '\r')) != NULL)
913 *p = 0; 1852 *p = 0;
914 if ((p = strchr(path, '\n')) != NULL) 1853 if ((p = strchr(path, '\n')) != NULL)
915 *p = 0; 1854 *p = 0;
916 1855
917 ldpaths[i++] = xstrdup(path); 1856 /* recursive includes of the same file will make this segfault. */
1857 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1858 glob_t gl;
1859 size_t x;
1860 const char *gpath;
918 1861
919 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths)) 1862 /* re-use existing path buffer ... need to be creative */
920 break; 1863 if (path[8] != '/')
1864 gpath = memcpy(path + 3, "/etc/", 5);
1865 else
1866 gpath = path + 8;
1867 if (root_fd != AT_FDCWD) {
1868 if (curr_fd == -1) {
1869 curr_fd = open(".", O_RDONLY|O_CLOEXEC);
1870 if (fchdir(root_fd))
1871 errp("unable to change to root dir");
1872 }
1873 gpath = root_rel_path(gpath);
1874 }
1875
1876 if (glob(gpath, 0, NULL, &gl) == 0) {
1877 for (x = 0; x < gl.gl_pathc; ++x) {
1878 /* try to avoid direct loops */
1879 if (strcmp(gl.gl_pathv[x], fname) == 0)
1880 continue;
1881 _load_ld_cache_config(gl.gl_pathv[x]);
1882 }
1883 globfree(&gl);
1884 }
1885
1886 /* failed globs are ignored by glibc */
1887 continue;
921 } 1888 }
922 ldpaths[i] = NULL; 1889
1890 if (*path != '/')
1891 continue;
1892
1893 xarraypush_str(ldpaths, path);
1894 }
1895 free(path);
923 1896
924 fclose(fp); 1897 fclose(fp);
1898
1899 if (curr_fd != -1) {
1900 if (fchdir(curr_fd))
1901 {/* don't care */}
1902 close(curr_fd);
1903 }
1904
1905 return 0;
1906}
1907
1908#elif defined(__FreeBSD__) || defined(__DragonFly__)
1909
1910static int _load_ld_cache_config(const char *fname)
1911{
1912 FILE *fp = NULL;
1913 char *b = NULL, *p;
1914 struct elfhints_hdr hdr;
1915
1916 fp = fopenat_r(root_fd, root_rel_path(fname));
1917 if (fp == NULL)
1918 return -1;
1919
1920 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1921 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1922 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1923 {
1924 fclose(fp);
1925 return -1;
1926 }
1927
1928 b = xmalloc(hdr.dirlistlen + 1);
1929 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1930 fclose(fp);
1931 free(b);
1932 return -1;
1933 }
1934
1935 while ((p = strsep(&b, ":"))) {
1936 if (*p == '\0')
1937 continue;
1938 xarraypush_str(ldpaths, p);
1939 }
1940
1941 free(b);
1942 fclose(fp);
1943 return 0;
1944}
1945
1946#else
1947#ifdef __ELF__
1948#warning Cache config support not implemented for your target
1949#endif
1950static int _load_ld_cache_config(const char *fname)
1951{
1952 return 0;
1953}
1954#endif
1955
1956static void load_ld_cache_config(const char *fname)
1957{
1958 bool scan_l, scan_ul, scan_ull;
1959 size_t n;
1960 const char *ldpath;
1961
1962 _load_ld_cache_config(fname);
1963
1964 scan_l = scan_ul = scan_ull = false;
1965 array_for_each(ldpaths, n, ldpath) {
1966 if (!scan_l && !strcmp(ldpath, "/lib")) scan_l = true;
1967 if (!scan_ul && !strcmp(ldpath, "/usr/lib")) scan_ul = true;
1968 if (!scan_ull && !strcmp(ldpath, "/usr/local/lib")) scan_ull = true;
1969 }
1970
1971 if (!scan_l) xarraypush_str(ldpaths, "/lib");
1972 if (!scan_ul) xarraypush_str(ldpaths, "/usr/lib");
1973 if (!scan_ull) xarraypush_str(ldpaths, "/usr/local/lib");
925} 1974}
926 1975
927/* scan /etc/ld.so.conf for paths */ 1976/* scan /etc/ld.so.conf for paths */
928static void scanelf_ldpath() 1977static void scanelf_ldpath(void)
929{ 1978{
930 char scan_l, scan_ul, scan_ull; 1979 size_t n;
931 int i = 0; 1980 const char *ldpath;
932 1981
933 if (!ldpaths[0]) 1982 array_for_each(ldpaths, n, ldpath)
934 err("Unable to load any paths from ld.so.conf");
935
936 scan_l = scan_ul = scan_ull = 0;
937
938 while (ldpaths[i]) {
939 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
940 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
941 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
942 scanelf_dir(ldpaths[i]); 1983 scanelf_dir(ldpath);
943 ++i;
944 }
945
946 if (!scan_l) scanelf_dir("/lib");
947 if (!scan_ul) scanelf_dir("/usr/lib");
948 if (!scan_ull) scanelf_dir("/usr/local/lib");
949} 1984}
950 1985
951/* scan env PATH for paths */ 1986/* scan env PATH for paths */
952static void scanelf_envpath() 1987static void scanelf_envpath(void)
953{ 1988{
954 char *path, *p; 1989 char *path, *p;
955 1990
956 path = getenv("PATH"); 1991 path = getenv("PATH");
957 if (!path) 1992 if (!path)
964 } 1999 }
965 2000
966 free(path); 2001 free(path);
967} 2002}
968 2003
969 2004/* usage / invocation handling functions */ /* Free Flags: c d j u w G H J K P Q U W */
970
971/* usage / invocation handling functions */
972#define PARSE_FLAGS "plRmyxetrnibSs:gN:TaqvF:f:o:BhV" 2005#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZCBhV"
973#define a_argument required_argument 2006#define a_argument required_argument
974static struct option const long_opts[] = { 2007static struct option const long_opts[] = {
975 {"path", no_argument, NULL, 'p'}, 2008 {"path", no_argument, NULL, 'p'},
976 {"ldpath", no_argument, NULL, 'l'}, 2009 {"ldpath", no_argument, NULL, 'l'},
2010 {"use-ldpath",no_argument, NULL, 129},
2011 {"root", a_argument, NULL, 128},
977 {"recursive", no_argument, NULL, 'R'}, 2012 {"recursive", no_argument, NULL, 'R'},
978 {"mount", no_argument, NULL, 'm'}, 2013 {"mount", no_argument, NULL, 'm'},
979 {"symlink", no_argument, NULL, 'y'}, 2014 {"symlink", no_argument, NULL, 'y'},
2015 {"archives", no_argument, NULL, 'A'},
2016 {"ldcache", no_argument, NULL, 'L'},
2017 {"fix", no_argument, NULL, 'X'},
2018 {"setpax", a_argument, NULL, 'z'},
980 {"pax", no_argument, NULL, 'x'}, 2019 {"pax", no_argument, NULL, 'x'},
981 {"header", no_argument, NULL, 'e'}, 2020 {"header", no_argument, NULL, 'e'},
982 {"textrel", no_argument, NULL, 't'}, 2021 {"textrel", no_argument, NULL, 't'},
983 {"rpath", no_argument, NULL, 'r'}, 2022 {"rpath", no_argument, NULL, 'r'},
984 {"needed", no_argument, NULL, 'n'}, 2023 {"needed", no_argument, NULL, 'n'},
985 {"interp", no_argument, NULL, 'i'}, 2024 {"interp", no_argument, NULL, 'i'},
986 {"bind", no_argument, NULL, 'b'}, 2025 {"bind", no_argument, NULL, 'b'},
987 {"soname", no_argument, NULL, 'S'}, 2026 {"soname", no_argument, NULL, 'S'},
988 {"symbol", a_argument, NULL, 's'}, 2027 {"symbol", a_argument, NULL, 's'},
2028 {"section", a_argument, NULL, 'k'},
989 {"lib", a_argument, NULL, 'N'}, 2029 {"lib", a_argument, NULL, 'N'},
990 {"gmatch", no_argument, NULL, 'g'}, 2030 {"gmatch", no_argument, NULL, 'g'},
991 {"textrels", no_argument, NULL, 'T'}, 2031 {"textrels", no_argument, NULL, 'T'},
2032 {"etype", a_argument, NULL, 'E'},
2033 {"bits", a_argument, NULL, 'M'},
2034 {"endian", no_argument, NULL, 'D'},
2035 {"osabi", no_argument, NULL, 'I'},
2036 {"eabi", no_argument, NULL, 'Y'},
2037 {"perms", a_argument, NULL, 'O'},
2038 {"size", no_argument, NULL, 'Z'},
992 {"all", no_argument, NULL, 'a'}, 2039 {"all", no_argument, NULL, 'a'},
993 {"quiet", no_argument, NULL, 'q'}, 2040 {"quiet", no_argument, NULL, 'q'},
994 {"verbose", no_argument, NULL, 'v'}, 2041 {"verbose", no_argument, NULL, 'v'},
995 {"format", a_argument, NULL, 'F'}, 2042 {"format", a_argument, NULL, 'F'},
996 {"from", a_argument, NULL, 'f'}, 2043 {"from", a_argument, NULL, 'f'},
997 {"file", a_argument, NULL, 'o'}, 2044 {"file", a_argument, NULL, 'o'},
2045 {"nocolor", no_argument, NULL, 'C'},
998 {"nobanner", no_argument, NULL, 'B'}, 2046 {"nobanner", no_argument, NULL, 'B'},
999 {"help", no_argument, NULL, 'h'}, 2047 {"help", no_argument, NULL, 'h'},
1000 {"version", no_argument, NULL, 'V'}, 2048 {"version", no_argument, NULL, 'V'},
1001 {NULL, no_argument, NULL, 0x0} 2049 {NULL, no_argument, NULL, 0x0}
1002}; 2050};
1003 2051
1004static const char *opts_help[] = { 2052static const char * const opts_help[] = {
1005 "Scan all directories in PATH environment", 2053 "Scan all directories in PATH environment",
1006 "Scan all directories in /etc/ld.so.conf", 2054 "Scan all directories in /etc/ld.so.conf",
2055 "Use ld.so.conf to show full path (use with -r/-n)",
2056 "Root directory (use with -l or -p)",
1007 "Scan directories recursively", 2057 "Scan directories recursively",
1008 "Don't recursively cross mount points", 2058 "Don't recursively cross mount points",
1009 "Don't scan symlinks\n", 2059 "Don't scan symlinks",
2060 "Scan archives (.a files)",
2061 "Utilize ld.so.cache to show full path (use with -r/-n)",
2062 "Try and 'fix' bad things (use with -r/-e)",
2063 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1010 "Print PaX markings", 2064 "Print PaX markings",
1011 "Print GNU_STACK/PT_LOAD markings", 2065 "Print GNU_STACK/PT_LOAD markings",
1012 "Print TEXTREL information", 2066 "Print TEXTREL information",
1013 "Print RPATH information", 2067 "Print RPATH information",
1014 "Print NEEDED information", 2068 "Print NEEDED information",
1015 "Print INTERP information", 2069 "Print INTERP information",
1016 "Print BIND information", 2070 "Print BIND information",
1017 "Print SONAME information", 2071 "Print SONAME information",
1018 "Find a specified symbol", 2072 "Find a specified symbol",
2073 "Find a specified section",
1019 "Find a specified library", 2074 "Find a specified library",
1020 "Use strncmp to match libraries. (use with -N)", 2075 "Use regex rather than string compare (with -s); specify twice for case insensitive",
1021 "Locate cause of TEXTREL", 2076 "Locate cause of TEXTREL",
1022 "Print all scanned info (-x -e -t -r -b)\n", 2077 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
2078 "Print only ELF files matching numeric bits",
2079 "Print Endianness",
2080 "Print OSABI",
2081 "Print EABI (EM_ARM Only)",
2082 "Print only ELF files matching octal permissions",
2083 "Print ELF file size",
2084 "Print all useful/simple info\n",
1023 "Only output 'bad' things", 2085 "Only output 'bad' things",
1024 "Be verbose (can be specified more than once)", 2086 "Be verbose (can be specified more than once)",
1025 "Use specified format for output", 2087 "Use specified format for output",
1026 "Read input stream from a filename", 2088 "Read input stream from a filename",
1027 "Write output stream to a filename", 2089 "Write output stream to a filename",
2090 "Don't emit color in output",
1028 "Don't display the header", 2091 "Don't display the header",
1029 "Print this help and exit", 2092 "Print this help and exit",
1030 "Print version and exit", 2093 "Print version and exit",
1031 NULL 2094 NULL
1032}; 2095};
1033 2096
1034/* display usage and exit */ 2097/* display usage and exit */
1035static void usage(int status) 2098static void usage(int status)
1036{ 2099{
1037 unsigned long i; 2100 const char a_arg[] = "<arg>";
2101 size_t a_arg_len = strlen(a_arg) + 2;
2102 size_t i;
2103 int optlen;
1038 printf("* Scan ELF binaries for stuff\n\n" 2104 printf("* Scan ELF binaries for stuff\n\n"
1039 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0); 2105 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1040 printf("Options: -[%s]\n", PARSE_FLAGS); 2106 printf("Options: -[%s]\n", PARSE_FLAGS);
2107
2108 /* prescan the --long opt length to auto-align */
2109 optlen = 0;
1041 for (i = 0; long_opts[i].name; ++i) 2110 for (i = 0; long_opts[i].name; ++i) {
2111 int l = strlen(long_opts[i].name);
2112 if (long_opts[i].has_arg == a_argument)
2113 l += a_arg_len;
2114 optlen = max(l, optlen);
2115 }
2116
2117 for (i = 0; long_opts[i].name; ++i) {
2118 /* first output the short flag if it has one */
2119 if (long_opts[i].val > '~')
2120 printf(" ");
2121 else
2122 printf(" -%c, ", long_opts[i].val);
2123
2124 /* then the long flag */
1042 if (long_opts[i].has_arg == no_argument) 2125 if (long_opts[i].has_arg == no_argument)
1043 printf(" -%c, --%-13s* %s\n", long_opts[i].val, 2126 printf("--%-*s", optlen, long_opts[i].name);
1044 long_opts[i].name, opts_help[i]);
1045 else 2127 else
1046 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val, 2128 printf("--%s %s %*s", long_opts[i].name, a_arg,
1047 long_opts[i].name, opts_help[i]); 2129 (int)(optlen - strlen(long_opts[i].name) - a_arg_len), "");
1048 2130
1049 if (status != EXIT_SUCCESS) 2131 /* finally the help text */
1050 exit(status); 2132 printf("* %s\n", opts_help[i]);
2133 }
1051 2134
1052 puts("\nThe format modifiers for the -F option are:"); 2135 puts("\nFor more information, see the scanelf(1) manpage");
1053 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1054 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1055 puts(" i INTERP \tb BIND \ts symbol");
1056 puts(" N library \to Type \tT TEXTRELs");
1057 puts(" S SONAME");
1058 puts(" p filename (with search path removed)");
1059 puts(" f filename (short name/basename)");
1060 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1061
1062 exit(status); 2136 exit(status);
1063} 2137}
1064 2138
1065/* parse command line arguments and preform needed actions */ 2139/* parse command line arguments and preform needed actions */
2140#define do_pax_state(option, flag) \
2141 if (islower(option)) { \
2142 flags &= ~PF_##flag; \
2143 flags |= PF_NO##flag; \
2144 } else { \
2145 flags &= ~PF_NO##flag; \
2146 flags |= PF_##flag; \
2147 }
2148static void parse_delimited(array_t *arr, char *arg, const char *delim)
2149{
2150 char *ele = strtok(arg, delim);
2151 if (!ele) /* edge case: -s '' */
2152 xarraypush_str(arr, "");
2153 while (ele) {
2154 xarraypush_str(arr, ele);
2155 ele = strtok(NULL, delim);
2156 }
2157}
1066static void parseargs(int argc, char *argv[]) 2158static int parseargs(int argc, char *argv[])
1067{ 2159{
1068 int i; 2160 int i;
1069 char *from_file = NULL; 2161 const char *from_file = NULL;
2162 int ret = 0;
2163 char load_cache_config = 0;
1070 2164
1071 opterr = 0; 2165 opterr = 0;
1072 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 2166 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1073 switch (i) { 2167 switch (i) {
1074 2168
1078 VERSION, __FILE__, __DATE__, rcsid, argv0); 2172 VERSION, __FILE__, __DATE__, rcsid, argv0);
1079 exit(EXIT_SUCCESS); 2173 exit(EXIT_SUCCESS);
1080 break; 2174 break;
1081 case 'h': usage(EXIT_SUCCESS); break; 2175 case 'h': usage(EXIT_SUCCESS); break;
1082 case 'f': 2176 case 'f':
1083 if (from_file) err("Don't specify -f twice"); 2177 if (from_file) warn("You prob don't want to specify -f twice");
1084 from_file = xstrdup(optarg); 2178 from_file = optarg;
2179 break;
2180 case 'E':
2181 /* historically, this was comma delimited */
2182 parse_delimited(match_etypes, optarg, ",");
2183 break;
2184 case 'M':
2185 match_bits = atoi(optarg);
2186 if (match_bits == 0) {
2187 if (strcmp(optarg, "ELFCLASS32") == 0)
2188 match_bits = 32;
2189 if (strcmp(optarg, "ELFCLASS64") == 0)
2190 match_bits = 64;
2191 }
2192 break;
2193 case 'O':
2194 if (sscanf(optarg, "%o", &match_perms) == -1)
2195 match_bits = 0;
1085 break; 2196 break;
1086 case 'o': { 2197 case 'o': {
1087 FILE *fp = NULL;
1088 if ((fp = freopen(optarg, "w", stdout)) == NULL) 2198 if (freopen(optarg, "w", stdout) == NULL)
1089 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 2199 errp("Could not freopen(%s)", optarg);
1090 SET_STDOUT(fp);
1091 break; 2200 break;
1092 } 2201 }
1093 2202 case 'k':
2203 xarraypush_str(find_section_arr, optarg);
2204 break;
2205 case 's':
2206 /* historically, this was comma delimited */
2207 parse_delimited(find_sym_arr, optarg, ",");
2208 break;
2209 case 'N':
2210 xarraypush_str(find_lib_arr, optarg);
2211 break;
1094 case 's': { 2212 case 'F': {
1095 size_t len; 2213 if (out_format) warn("You prob don't want to specify -F twice");
1096 if (find_sym) err("Don't specify -s twice"); 2214 out_format = optarg;
1097 find_sym = xstrdup(optarg);
1098 len = strlen(find_sym) + 1;
1099 versioned_symname = (char*)xmalloc(sizeof(char) * (len+1));
1100 sprintf(versioned_symname, "%s@", find_sym);
1101 break; 2215 break;
1102 } 2216 }
1103 case 'N': { 2217 case 'z': {
1104 if (find_lib) err("Don't specify -N twice"); 2218 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1105 find_lib = xstrdup(optarg); 2219 size_t x;
2220
2221 for (x = 0; x < strlen(optarg); x++) {
2222 switch (optarg[x]) {
2223 case 'p':
2224 case 'P':
2225 do_pax_state(optarg[x], PAGEEXEC);
2226 break;
2227 case 's':
2228 case 'S':
2229 do_pax_state(optarg[x], SEGMEXEC);
2230 break;
2231 case 'm':
2232 case 'M':
2233 do_pax_state(optarg[x], MPROTECT);
2234 break;
2235 case 'e':
2236 case 'E':
2237 do_pax_state(optarg[x], EMUTRAMP);
2238 break;
2239 case 'r':
2240 case 'R':
2241 do_pax_state(optarg[x], RANDMMAP);
2242 break;
2243 case 'x':
2244 case 'X':
2245 do_pax_state(optarg[x], RANDEXEC);
2246 break;
2247 default:
2248 break;
2249 }
2250 }
2251 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
2252 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
2253 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
2254 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
2255 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
2256 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
2257 setpax = flags;
1106 break; 2258 break;
1107 } 2259 }
1108 2260 case 'Z': show_size = 1; break;
1109 case 'F': { 2261 case 'g': ++g_match; break;
1110 if (out_format) err("Don't specify -F twice"); 2262 case 'L': load_cache_config = use_ldcache = 1; break;
1111 out_format = xstrdup(optarg);
1112 break;
1113 }
1114
1115 case 'g': gmatch = 1;
1116 case 'y': scan_symlink = 0; break; 2263 case 'y': scan_symlink = 0; break;
2264 case 'A': scan_archives = 1; break;
2265 case 'C': color_init(true); break;
1117 case 'B': show_banner = 0; break; 2266 case 'B': show_banner = 0; break;
1118 case 'l': scan_ldpath = 1; break; 2267 case 'l': load_cache_config = scan_ldpath = 1; break;
1119 case 'p': scan_envpath = 1; break; 2268 case 'p': scan_envpath = 1; break;
1120 case 'R': dir_recurse = 1; break; 2269 case 'R': dir_recurse = 1; break;
1121 case 'm': dir_crossmount = 0; break; 2270 case 'm': dir_crossmount = 0; break;
2271 case 'X': ++fix_elf; break;
1122 case 'x': show_pax = 1; break; 2272 case 'x': show_pax = 1; break;
1123 case 'e': show_phdr = 1; break; 2273 case 'e': show_phdr = 1; break;
1124 case 't': show_textrel = 1; break; 2274 case 't': show_textrel = 1; break;
1125 case 'r': show_rpath = 1; break; 2275 case 'r': show_rpath = 1; break;
1126 case 'n': show_needed = 1; break; 2276 case 'n': show_needed = 1; break;
1127 case 'i': show_interp = 1; break; 2277 case 'i': show_interp = 1; break;
1128 case 'b': show_bind = 1; break; 2278 case 'b': show_bind = 1; break;
1129 case 'S': show_soname = 1; break; 2279 case 'S': show_soname = 1; break;
1130 case 'T': show_textrels = 1; break; 2280 case 'T': show_textrels = 1; break;
1131 case 'q': be_quiet = 1; break; 2281 case 'q': be_quiet = min(be_quiet, 20) + 1; break;
1132 case 'v': be_verbose = (be_verbose % 20) + 1; break; 2282 case 'v': be_verbose = min(be_verbose, 20) + 1; break;
1133 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break; 2283 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
1134 2284 case 'D': show_endian = 1; break;
2285 case 'I': show_osabi = 1; break;
2286 case 'Y': show_eabi = 1; break;
2287 case 128:
2288 root_fd = open(optarg, O_RDONLY|O_CLOEXEC);
2289 if (root_fd == -1)
2290 err("Could not open root: %s", optarg);
2291 break;
2292 case 129: load_cache_config = use_ldpath = 1; break;
1135 case ':': 2293 case ':':
1136 err("Option missing parameter\n"); 2294 err("Option '%c' is missing parameter", optopt);
1137 case '?': 2295 case '?':
1138 err("Unknown option\n"); 2296 err("Unknown option '%c' or argument missing", optopt);
1139 default: 2297 default:
1140 err("Unhandled option '%c'", i); 2298 err("Unhandled option '%c'; please report this", i);
1141 } 2299 }
1142 } 2300 }
2301 if (show_textrels && be_verbose)
2302 objdump = which("objdump", "OBJDUMP");
2303 /* precompile all the regexes */
2304 if (g_match) {
2305 regex_t preg;
2306 const char *this_sym;
2307 size_t n;
2308 int flags = REG_EXTENDED | REG_NOSUB | (g_match > 1 ? REG_ICASE : 0);
1143 2309
2310 array_for_each(find_sym_arr, n, this_sym) {
2311 /* see scanelf_match_symname for logic info */
2312 switch (this_sym[0]) {
2313 case '%':
2314 while (*(this_sym++))
2315 if (*this_sym == '%') {
2316 ++this_sym;
2317 break;
2318 }
2319 break;
2320 case '+':
2321 case '-':
2322 ++this_sym;
2323 break;
2324 }
2325 if (*this_sym == '*')
2326 ++this_sym;
2327
2328 ret = regcomp(&preg, this_sym, flags);
2329 if (ret) {
2330 char err[256];
2331 regerror(ret, &preg, err, sizeof(err));
2332 err("regcomp of %s failed: %s", this_sym, err);
2333 }
2334 xarraypush(find_sym_regex_arr, &preg, sizeof(preg));
2335 }
2336 }
2337 /* flatten arrays for display */
2338 find_sym = array_flatten_str(find_sym_arr);
2339 find_lib = array_flatten_str(find_lib_arr);
2340 find_section = array_flatten_str(find_section_arr);
1144 /* let the format option override all other options */ 2341 /* let the format option override all other options */
1145 if (out_format) { 2342 if (out_format) {
1146 show_pax = show_phdr = show_textrel = show_rpath = \ 2343 show_pax = show_phdr = show_textrel = show_rpath = \
1147 show_needed = show_interp = show_bind = show_soname = \ 2344 show_needed = show_interp = show_bind = show_soname = \
1148 show_textrels = 0; 2345 show_textrels = show_perms = show_endian = show_size = \
2346 show_osabi = show_eabi = 0;
1149 for (i = 0; out_format[i]; ++i) { 2347 for (i = 0; out_format[i]; ++i) {
1150 if (!IS_MODIFIER(out_format[i])) continue; 2348 if (!IS_MODIFIER(out_format[i])) continue;
1151 2349
1152 switch (out_format[++i]) { 2350 switch (out_format[++i]) {
2351 case '+': break;
1153 case '%': break; 2352 case '%': break;
1154 case '#': break; 2353 case '#': break;
1155 case 'F': break; 2354 case 'F': break;
1156 case 'p': break; 2355 case 'p': break;
1157 case 'f': break; 2356 case 'f': break;
2357 case 'k': break;
1158 case 's': break; 2358 case 's': break;
1159 case 'N': break; 2359 case 'N': break;
1160 case 'o': break; 2360 case 'o': break;
2361 case 'a': break;
2362 case 'M': break;
2363 case 'Z': show_size = 1; break;
2364 case 'D': show_endian = 1; break;
2365 case 'I': show_osabi = 1; break;
2366 case 'Y': show_eabi = 1; break;
2367 case 'O': show_perms = 1; break;
1161 case 'x': show_pax = 1; break; 2368 case 'x': show_pax = 1; break;
1162 case 'e': show_phdr = 1; break; 2369 case 'e': show_phdr = 1; break;
1163 case 't': show_textrel = 1; break; 2370 case 't': show_textrel = 1; break;
1164 case 'r': show_rpath = 1; break; 2371 case 'r': show_rpath = 1; break;
1165 case 'n': show_needed = 1; break; 2372 case 'n': show_needed = 1; break;
1166 case 'i': show_interp = 1; break; 2373 case 'i': show_interp = 1; break;
1167 case 'b': show_bind = 1; break; 2374 case 'b': show_bind = 1; break;
1168 case 'S': show_soname = 1; break; 2375 case 'S': show_soname = 1; break;
1169 case 'T': show_textrels = 1; break; 2376 case 'T': show_textrels = 1; break;
1170 default: 2377 default:
1171 err("Invalid format specifier '%c' (byte %i)", 2378 err("invalid format specifier '%c' (byte %i)",
1172 out_format[i], i+1); 2379 out_format[i], i+1);
1173 } 2380 }
1174 } 2381 }
1175 2382
1176 /* construct our default format */ 2383 /* construct our default format */
1177 } else { 2384 } else {
1178 size_t fmt_len = 30; 2385 size_t fmt_len = 30;
1179 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 2386 out_format = xmalloc(sizeof(char) * fmt_len);
2387 *out_format = '\0';
1180 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 2388 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1181 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len); 2389 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
2390 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
2391 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
2392 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
2393 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
2394 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
1182 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len); 2395 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1183 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 2396 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1184 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 2397 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1185 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 2398 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1186 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 2399 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1187 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len); 2400 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1188 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len); 2401 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1189 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len); 2402 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1190 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len); 2403 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
2404 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1191 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len); 2405 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1192 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 2406 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1193 } 2407 }
1194 if (be_verbose > 2) printf("Format: %s\n", out_format); 2408 if (be_verbose > 2) printf("Format: %s\n", out_format);
1195 2409
1196 /* now lets actually do the scanning */ 2410 /* now lets actually do the scanning */
1197 if (scan_ldpath || (show_rpath && be_quiet)) 2411 if (load_cache_config)
1198 load_ld_so_conf(); 2412 load_ld_cache_config(__PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
1199 if (scan_ldpath) scanelf_ldpath(); 2413 if (scan_ldpath) scanelf_ldpath();
1200 if (scan_envpath) scanelf_envpath(); 2414 if (scan_envpath) scanelf_envpath();
2415 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
2416 from_file = "-";
1201 if (from_file) { 2417 if (from_file) {
1202 scanelf_from_file(from_file); 2418 scanelf_from_file(from_file);
1203 free(from_file);
1204 from_file = *argv; 2419 from_file = *argv;
1205 } 2420 }
1206 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file) 2421 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1207 err("Nothing to scan !?"); 2422 err("Nothing to scan !?");
1208 while (optind < argc) { 2423 while (optind < argc) {
1209 search_path = argv[optind++]; 2424 search_path = argv[optind++];
1210 scanelf_dir(search_path); 2425 ret = scanelf_dir(search_path);
1211 } 2426 }
1212 2427
2428#ifdef __PAX_UTILS_CLEANUP
1213 /* clean up */ 2429 /* clean up */
1214 if (find_sym) { 2430 xarrayfree(ldpaths);
2431 xarrayfree(find_sym_arr);
2432 xarrayfree(find_lib_arr);
2433 xarrayfree(find_section_arr);
1215 free(find_sym); 2434 free(find_sym);
1216 free(versioned_symname); 2435 free(find_lib);
2436 free(find_section);
2437 {
2438 size_t n;
2439 regex_t *preg;
2440 array_for_each(find_sym_regex_arr, n, preg)
2441 regfree(preg);
2442 xarrayfree(find_sym_regex_arr);
1217 } 2443 }
1218 if (find_lib) free(find_lib);
1219 if (out_format) free(out_format);
1220 for (i = 0; ldpaths[i]; ++i)
1221 free(ldpaths[i]);
1222}
1223 2444
2445 if (ldcache != 0)
2446 munmap(ldcache, ldcache_size);
2447#endif
1224 2448
1225
1226/* utility funcs */
1227static char *xstrdup(const char *s)
1228{
1229 char *ret = strdup(s);
1230 if (!ret) err("Could not strdup(): %s", strerror(errno));
1231 return ret; 2449 return ret;
1232} 2450}
1233 2451
1234static void *xmalloc(size_t size) 2452static char **get_split_env(const char *envvar)
1235{ 2453{
1236 void *ret = malloc(size); 2454 const char *delims = " \t\n";
1237 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size); 2455 char **envvals = NULL;
1238 return ret; 2456 char *env, *s;
1239} 2457 int nentry;
1240 2458
1241static void xstrcat(char **dst, const char *src, size_t *curr_len) 2459 if ((env = getenv(envvar)) == NULL)
1242{ 2460 return NULL;
1243 size_t new_len;
1244 2461
1245 new_len = strlen(*dst) + strlen(src); 2462 env = xstrdup(env);
1246 if (*curr_len <= new_len) { 2463 if (env == NULL)
1247 *curr_len = new_len + (*curr_len / 2); 2464 return NULL;
1248 *dst = realloc(*dst, *curr_len);
1249 if (!*dst)
1250 err("could not realloc %li bytes", (unsigned long)*curr_len);
1251 }
1252 2465
1253 strcat(*dst, src); 2466 s = strtok(env, delims);
1254} 2467 if (s == NULL) {
2468 free(env);
2469 return NULL;
2470 }
1255 2471
1256static inline void xchrcat(char **dst, const char append, size_t *curr_len) 2472 nentry = 0;
1257{ 2473 while (s != NULL) {
1258 static char my_app[2]; 2474 ++nentry;
1259 my_app[0] = append; 2475 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
1260 my_app[1] = '\0'; 2476 envvals[nentry-1] = s;
1261 xstrcat(dst, my_app, curr_len); 2477 s = strtok(NULL, delims);
1262} 2478 }
2479 envvals[nentry] = NULL;
1263 2480
2481 /* don't want to free(env) as it contains the memory that backs
2482 * the envvals array of strings */
2483 return envvals;
2484}
1264 2485
2486static void parseenv(void)
2487{
2488 color_init(false);
2489 qa_textrels = get_split_env("QA_TEXTRELS");
2490 qa_execstack = get_split_env("QA_EXECSTACK");
2491 qa_wx_load = get_split_env("QA_WX_LOAD");
2492}
2493
2494#ifdef __PAX_UTILS_CLEANUP
2495static void cleanup(void)
2496{
2497 free(out_format);
2498 free(qa_textrels);
2499 free(qa_execstack);
2500 free(qa_wx_load);
2501}
2502#endif
1265 2503
1266int main(int argc, char *argv[]) 2504int main(int argc, char *argv[])
1267{ 2505{
2506 int ret;
1268 if (argc < 2) 2507 if (argc < 2)
1269 usage(EXIT_FAILURE); 2508 usage(EXIT_FAILURE);
2509 parseenv();
1270 parseargs(argc, argv); 2510 ret = parseargs(argc, argv);
1271 fclose(stdout); 2511 fclose(stdout);
1272#ifdef __BOUNDS_CHECKING_ON 2512#ifdef __PAX_UTILS_CLEANUP
1273 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()"); 2513 cleanup();
2514 warn("The calls to add/delete heap should be off:\n"
2515 "\t- 1 due to the out_buffer not being freed in scanelf_fileat()\n"
2516 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
1274#endif 2517#endif
1275 return EXIT_SUCCESS; 2518 return ret;
1276} 2519}
2520
2521/* Match filename against entries in matchlist, return TRUE
2522 * if the file is listed */
2523static int file_matches_list(const char *filename, char **matchlist)
2524{
2525 char **file;
2526 char *match;
2527 char buf[__PAX_UTILS_PATH_MAX];
2528
2529 if (matchlist == NULL)
2530 return 0;
2531
2532 for (file = matchlist; *file != NULL; file++) {
2533 if (search_path) {
2534 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2535 match = buf;
2536 } else {
2537 match = *file;
2538 }
2539 if (fnmatch(match, filename, 0) == 0)
2540 return 1;
2541 }
2542 return 0;
2543}

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