/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.96 Revision 1.269
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 1.96 2005/12/28 22:26:47 solar Exp $ 4 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.269 2014/11/20 01:25:56 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 1.269 2014/11/20 01:25:56 vapier Exp $";
11#include <stdlib.h> 11const char argv0[] = "scanelf";
12#include <sys/types.h> 12
13#include <libgen.h>
14#include <limits.h>
15#include <string.h>
16#include <errno.h>
17#include <unistd.h>
18#include <sys/stat.h>
19#include <sys/mman.h>
20#include <fcntl.h>
21#include <dirent.h>
22#include <getopt.h>
23#include <assert.h>
24#include "paxinc.h" 13#include "paxinc.h"
25 14
26static const char *rcsid = "$Id: scanelf.c,v 1.96 2005/12/28 22:26:47 solar Exp $";
27#define argv0 "scanelf"
28
29#define IS_MODIFIER(c) (c == '%' || c == '#') 15#define IS_MODIFIER(c) (c == '%' || c == '#' || c == '+')
30
31
32 16
33/* prototypes */ 17/* prototypes */
34static void scanelf_file(const char *filename); 18static int file_matches_list(const char *filename, char **matchlist);
35static void scanelf_dir(const char *path);
36static void scanelf_ldpath();
37static void scanelf_envpath();
38static void usage(int status);
39static void parseargs(int argc, char *argv[]);
40static char *xstrdup(const char *s);
41static void *xmalloc(size_t size);
42static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n);
43#define xstrcat(dst,src,curr_len) xstrncat(dst,src,curr_len,0)
44static inline void xchrcat(char **dst, const char append, size_t *curr_len);
45 19
46/* variables to control behavior */ 20/* variables to control behavior */
47static char *ldpaths[256]; 21static array_t _match_etypes = array_init_decl, *match_etypes = &_match_etypes;
22static array_t _ldpaths = array_init_decl, *ldpaths = &_ldpaths;
48static char scan_ldpath = 0; 23static char scan_ldpath = 0;
49static char scan_envpath = 0; 24static char scan_envpath = 0;
50static char scan_symlink = 1; 25static char scan_symlink = 1;
26static char scan_archives = 0;
51static char dir_recurse = 0; 27static char dir_recurse = 0;
52static char dir_crossmount = 1; 28static char dir_crossmount = 1;
53static char show_pax = 0; 29static char show_pax = 0;
30static char show_perms = 0;
31static char show_size = 0;
54static char show_phdr = 0; 32static char show_phdr = 0;
55static char show_textrel = 0; 33static char show_textrel = 0;
56static char show_rpath = 0; 34static char show_rpath = 0;
57static char show_needed = 0; 35static char show_needed = 0;
58static char show_interp = 0; 36static char show_interp = 0;
59static char show_bind = 0; 37static char show_bind = 0;
60static char show_soname = 0; 38static char show_soname = 0;
61static char show_textrels = 0; 39static char show_textrels = 0;
62static char show_banner = 1; 40static char show_banner = 1;
41static char show_endian = 0;
42static char show_osabi = 0;
43static char show_eabi = 0;
63static char be_quiet = 0; 44static char be_quiet = 0;
64static char be_verbose = 0; 45static char be_verbose = 0;
65static char be_wewy_wewy_quiet = 0; 46static char be_wewy_wewy_quiet = 0;
66static 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;
67static 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;
68static char *out_format = NULL; 55static char *out_format = NULL;
69static char *search_path = NULL; 56static char *search_path = NULL;
57static char fix_elf = 0;
70static char gmatch = 0; 58static char g_match = 0;
71static char printcache = 0; 59static char use_ldcache = 0;
60static char use_ldpath = 0;
72 61
62static char **qa_textrels = NULL;
63static char **qa_execstack = NULL;
64static char **qa_wx_load = NULL;
65static int root_fd = AT_FDCWD;
73 66
74caddr_t ldcache = 0; 67static int match_bits = 0;
68static unsigned int match_perms = 0;
69static void *ldcache = NULL;
75size_t ldcache_size = 0; 70static size_t ldcache_size = 0;
71static unsigned long setpax = 0UL;
76 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
77/* sub-funcs for scanelf_file() */ 164/* sub-funcs for scanelf_fileat() */
78static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab) 165static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **str)
79{ 166{
80 /* 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 */
81#define GET_SYMTABS(B) \ 185#define GET_SYMTABS(B) \
82 if (elf->elf_class == ELFCLASS ## B) { \ 186 if (elf->elf_class == ELFCLASS ## B) { \
83 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \ 187 Elf ## B ## _Shdr *esymtab = symtab; \
84 /* debug sections */ \ 188 Elf ## B ## _Shdr *estrtab = strtab; \
85 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \ 189 Elf ## B ## _Shdr *edynsym = dynsym; \
86 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \ 190 Elf ## B ## _Shdr *edynstr = dynstr; \
87 /* runtime sections */ \ 191 \
88 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \ 192 if (symtab && EGET(esymtab->sh_type) == SHT_NOBITS) \
89 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \ 193 symtab = NULL; \
90 if (symtab && dynsym) { \ 194 if (dynsym && EGET(edynsym->sh_type) == SHT_NOBITS) \
91 *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; \
205 else \
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; \
92 } else { \ 217 } else { \
93 *sym = (void*)(symtab ? symtab : dynsym); \ 218 *sym = *str = NULL; \
94 } \ 219 } \
95 if (strtab && dynstr) { \
96 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \
97 } else { \
98 *tab = (void*)(strtab ? strtab : dynstr); \
99 } \
100 } 220 }
101 GET_SYMTABS(32) 221 GET_SYMTABS(32)
102 GET_SYMTABS(64) 222 GET_SYMTABS(64)
223
224 if (*sym && *str)
225 return;
226
227 /*
228 * damn, they're really going to make us work for it huh?
229 * reconstruct the section header info out of the dynamic
230 * tags so we can see what symbols this guy uses at runtime.
231 */
232#define GET_SYMTABS_DT(B) \
233 if (elf->elf_class == ELFCLASS ## B) { \
234 size_t i; \
235 static Elf ## B ## _Shdr sym_shdr, str_shdr; \
236 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
237 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
238 Elf ## B ## _Addr vsym, vstr, vhash, vgnu_hash; \
239 Elf ## B ## _Dyn *dyn; \
240 Elf ## B ## _Off offset; \
241 \
242 /* lookup symbols used at runtime with DT_SYMTAB / DT_STRTAB */ \
243 vsym = vstr = vhash = vgnu_hash = 0; \
244 memset(&sym_shdr, 0, sizeof(sym_shdr)); \
245 memset(&str_shdr, 0, sizeof(str_shdr)); \
246 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
247 if (EGET(phdr[i].p_type) != PT_DYNAMIC) \
248 continue; \
249 \
250 offset = EGET(phdr[i].p_offset); \
251 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
252 continue; \
253 \
254 dyn = DYN ## B (elf->vdata + offset); \
255 while (EGET(dyn->d_tag) != DT_NULL) { \
256 switch (EGET(dyn->d_tag)) { \
257 case DT_SYMTAB: vsym = EGET(dyn->d_un.d_val); break; \
258 case DT_SYMENT: sym_shdr.sh_entsize = dyn->d_un.d_val; break; \
259 case DT_STRTAB: vstr = EGET(dyn->d_un.d_val); break; \
260 case DT_STRSZ: str_shdr.sh_size = dyn->d_un.d_val; break; \
261 case DT_HASH: vhash = EGET(dyn->d_un.d_val); break; \
262 /*case DT_GNU_HASH: vgnu_hash = EGET(dyn->d_un.d_val); break;*/ \
263 } \
264 ++dyn; \
265 } \
266 if (vsym && vstr) \
267 break; \
268 } \
269 if (!vsym || !vstr || !(vhash || vgnu_hash)) \
270 return; \
271 \
272 /* calc offset into the ELF by finding the load addr of the syms */ \
273 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
274 Elf ## B ## _Addr vaddr = EGET(phdr[i].p_vaddr); \
275 Elf ## B ## _Addr filesz = EGET(phdr[i].p_filesz); \
276 offset = EGET(phdr[i].p_offset); \
277 \
278 if (EGET(phdr[i].p_type) != PT_LOAD) \
279 continue; \
280 \
281 if (vhash >= vaddr && vhash < vaddr + filesz) { \
282 /* Scan the hash table to see how many entries we have */ \
283 Elf32_Word max_sym_idx = 0; \
284 Elf32_Word *hashtbl = elf->vdata + offset + (vhash - vaddr); \
285 Elf32_Word b, nbuckets = EGET(hashtbl[0]); \
286 Elf32_Word nchains = EGET(hashtbl[1]); \
287 Elf32_Word *buckets = &hashtbl[2]; \
288 Elf32_Word *chains = &buckets[nbuckets]; \
289 Elf32_Word sym_idx; \
290 \
291 for (b = 0; b < nbuckets; ++b) { \
292 if (!buckets[b]) \
293 continue; \
294 for (sym_idx = buckets[b]; sym_idx < nchains && sym_idx; sym_idx = chains[sym_idx]) \
295 if (max_sym_idx < sym_idx) \
296 max_sym_idx = sym_idx; \
297 } \
298 ESET(sym_shdr.sh_size, sym_shdr.sh_entsize * max_sym_idx); \
299 } \
300 \
301 if (vsym >= vaddr && vsym < vaddr + filesz) { \
302 ESET(sym_shdr.sh_offset, offset + (vsym - vaddr)); \
303 *sym = &sym_shdr; \
304 } \
305 \
306 if (vstr >= vaddr && vstr < vaddr + filesz) { \
307 ESET(str_shdr.sh_offset, offset + (vstr - vaddr)); \
308 *str = &str_shdr; \
309 } \
310 } \
311 }
312 GET_SYMTABS_DT(32)
313 GET_SYMTABS_DT(64)
103} 314}
315
104static char *scanelf_file_pax(elfobj *elf, char *found_pax) 316static char *scanelf_file_pax(elfobj *elf, char *found_pax)
105{ 317{
106 static char ret[7]; 318 static char ret[7];
107 unsigned long i, shown; 319 unsigned long i, shown;
108 320
117 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 329 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
118 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 330 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
119 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 331 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
120 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \ 332 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
121 continue; \ 333 continue; \
122 if (be_quiet && (EGET(phdr[i].p_flags) == 10240)) \ 334 if (fix_elf && setpax) { \
335 /* set the paxctl flags */ \
336 ESET(phdr[i].p_flags, setpax); \
337 } \
338 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
123 continue; \ 339 continue; \
124 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \ 340 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
125 *found_pax = 1; \ 341 *found_pax = 1; \
126 ++shown; \ 342 ++shown; \
127 break; \ 343 break; \
128 } \ 344 } \
129 } 345 }
130 SHOW_PAX(32) 346 SHOW_PAX(32)
131 SHOW_PAX(64) 347 SHOW_PAX(64)
132 } 348 }
349
350 /* Note: We do not support setting EI_PAX if not PT_PAX_FLAGS
351 * was found. This is known to break ELFs on glibc systems,
352 * and mainline PaX has deprecated use of this for a long time.
353 * We could support changing PT_GNU_STACK, but that doesn't
354 * seem like it's worth the effort. #411919
355 */
133 356
134 /* fall back to EI_PAX if no PT_PAX was found */ 357 /* fall back to EI_PAX if no PT_PAX was found */
135 if (!*ret) { 358 if (!*ret) {
136 static char *paxflags; 359 static char *paxflags;
137 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf)); 360 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
150 373
151static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load) 374static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
152{ 375{
153 static char ret[12]; 376 static char ret[12];
154 char *found; 377 char *found;
155 unsigned long i, shown;
156 unsigned char multi_stack, multi_relro, multi_load; 378 unsigned long i, shown, multi_stack, multi_relro, multi_load;
157 379
158 if (!show_phdr) return NULL; 380 if (!show_phdr) return NULL;
159 381
160 memcpy(ret, "--- --- ---\0", 12); 382 memcpy(ret, "--- --- ---\0", 12);
161 383
162 shown = 0; 384 shown = 0;
163 multi_stack = multi_relro = multi_load = 0; 385 multi_stack = multi_relro = multi_load = 0;
164 386
387#define NOTE_GNU_STACK ".note.GNU-stack"
165#define SHOW_PHDR(B) \ 388#define SHOW_PHDR(B) \
166 if (elf->elf_class == ELFCLASS ## B) { \ 389 if (elf->elf_class == ELFCLASS ## B) { \
167 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 390 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
168 Elf ## B ## _Off offset; \ 391 Elf ## B ## _Off offset; \
169 uint32_t flags, check_flags; \ 392 uint32_t flags, check_flags; \
170 if (elf->phdr != NULL) { \ 393 if (elf->phdr != NULL) { \
171 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 394 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
172 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \ 395 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
173 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \ 396 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
397 if (multi_stack++) \
174 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \ 398 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
399 if (file_matches_list(elf->filename, qa_execstack)) \
400 continue; \
175 found = found_phdr; \ 401 found = found_phdr; \
176 offset = 0; \ 402 offset = 0; \
177 check_flags = PF_X; \ 403 check_flags = PF_X; \
178 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \ 404 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
405 if (multi_relro++) \
179 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \ 406 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
180 found = found_relro; \ 407 found = found_relro; \
181 offset = 4; \ 408 offset = 4; \
182 check_flags = PF_X; \ 409 check_flags = PF_X; \
183 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \ 410 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
184 if (multi_load++ > 2) warnf("%s: more than 2 PT_LOAD's !?", elf->filename); \ 411 if (file_matches_list(elf->filename, qa_wx_load)) \
412 continue; \
185 found = found_load; \ 413 found = found_load; \
186 offset = 8; \ 414 offset = 8; \
187 check_flags = PF_W|PF_X; \ 415 check_flags = PF_W|PF_X; \
188 } else \ 416 } else \
189 continue; \ 417 continue; \
190 flags = EGET(phdr[i].p_flags); \ 418 flags = EGET(phdr[i].p_flags); \
191 if (be_quiet && ((flags & check_flags) != check_flags)) \ 419 if (be_quiet && ((flags & check_flags) != check_flags)) \
192 continue; \ 420 continue; \
421 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
422 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
423 ret[3] = ret[7] = '!'; \
424 flags = EGET(phdr[i].p_flags); \
425 } \
193 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \ 426 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
194 *found = 1; \ 427 *found = 1; \
195 ++shown; \ 428 ++shown; \
196 } \ 429 } \
197 } else if (elf->shdr != NULL) { \ 430 } else if (elf->shdr != NULL) { \
198 /* no program headers which means this is prob an object file */ \ 431 /* no program headers which means this is prob an object file */ \
199 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \ 432 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
200 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \ 433 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
434 char *str; \
435 if ((void*)strtbl > elf->data_end) \
436 goto skip_this_shdr##B; \
437 /* let's flag -w/+x object files since the final ELF will most likely \
438 * need write access to the stack (who doesn't !?). so the combined \
439 * output will bring in +w automatically and that's bad. \
440 */ \
201 check_flags = SHF_WRITE|SHF_EXECINSTR; \ 441 check_flags = /*SHF_WRITE|*/SHF_EXECINSTR; \
202 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \ 442 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
203 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \ 443 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
204 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \ 444 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
205 if (!strcmp((char*)(elf->data + offset), ".note.GNU-stack")) { \ 445 str = elf->data + offset; \
446 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
447 if (!strcmp(str, NOTE_GNU_STACK)) { \
206 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \ 448 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
207 flags = EGET(shdr[i].sh_flags); \ 449 flags = EGET(shdr[i].sh_flags); \
208 if (be_quiet && ((flags & check_flags) != check_flags)) \ 450 if (be_quiet && ((flags & check_flags) != check_flags)) \
209 continue; \ 451 continue; \
210 ++*found_phdr; \ 452 ++*found_phdr; \
214 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \ 456 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
215 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \ 457 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
216 break; \ 458 break; \
217 } \ 459 } \
218 } \ 460 } \
461 skip_this_shdr##B: \
219 if (!multi_stack) { \ 462 if (!multi_stack) { \
463 if (file_matches_list(elf->filename, qa_execstack)) \
464 return NULL; \
220 *found_phdr = 1; \ 465 *found_phdr = 1; \
221 shown = 1; \ 466 shown = 1; \
222 memcpy(ret, "!WX", 3); \ 467 memcpy(ret, "!WX", 3); \
223 } \ 468 } \
224 } \ 469 } \
229 if (be_wewy_wewy_quiet || (be_quiet && !shown)) 474 if (be_wewy_wewy_quiet || (be_quiet && !shown))
230 return NULL; 475 return NULL;
231 else 476 else
232 return ret; 477 return ret;
233} 478}
479
480/*
481 * See if this ELF contains a DT_TEXTREL tag in any of its
482 * PT_DYNAMIC sections.
483 */
234static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 484static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
235{ 485{
236 static const char *ret = "TEXTREL"; 486 static const char *ret = "TEXTREL";
237 unsigned long i; 487 unsigned long i;
238 488
239 if (!show_textrel && !show_textrels) return NULL; 489 if (!show_textrel && !show_textrels) return NULL;
490
491 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
240 492
241 if (elf->phdr) { 493 if (elf->phdr) {
242#define SHOW_TEXTREL(B) \ 494#define SHOW_TEXTREL(B) \
243 if (elf->elf_class == ELFCLASS ## B) { \ 495 if (elf->elf_class == ELFCLASS ## B) { \
244 Elf ## B ## _Dyn *dyn; \ 496 Elf ## B ## _Dyn *dyn; \
245 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 497 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
246 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 498 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
247 Elf ## B ## _Off offset; \ 499 Elf ## B ## _Off offset; \
248 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 500 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
249 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 501 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
250 offset = EGET(phdr[i].p_offset); \ 502 offset = EGET(phdr[i].p_offset); \
251 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 503 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
252 dyn = DYN ## B (elf->data + offset); \ 504 dyn = DYN ## B (elf->vdata + offset); \
253 while (EGET(dyn->d_tag) != DT_NULL) { \ 505 while (EGET(dyn->d_tag) != DT_NULL) { \
254 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \ 506 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
255 *found_textrel = 1; \ 507 *found_textrel = 1; \
256 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \ 508 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
257 return (be_wewy_wewy_quiet ? NULL : ret); \ 509 return (be_wewy_wewy_quiet ? NULL : ret); \
266 if (be_quiet || be_wewy_wewy_quiet) 518 if (be_quiet || be_wewy_wewy_quiet)
267 return NULL; 519 return NULL;
268 else 520 else
269 return " - "; 521 return " - ";
270} 522}
523
524/*
525 * Scan the .text section to see if there are any relocations in it.
526 * Should rewrite this to check PT_LOAD sections that are marked
527 * Executable rather than the section named '.text'.
528 */
271static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel) 529static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
272{ 530{
273 unsigned long s, r, rmax; 531 unsigned long s, r, rmax;
274 void *symtab_void, *strtab_void, *text_void; 532 void *symtab_void, *strtab_void, *text_void;
275 533
296 Elf ## B ## _Rela *rela; \ 554 Elf ## B ## _Rela *rela; \
297 /* search the section headers for relocations */ \ 555 /* search the section headers for relocations */ \
298 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \ 556 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
299 uint32_t sh_type = EGET(shdr[s].sh_type); \ 557 uint32_t sh_type = EGET(shdr[s].sh_type); \
300 if (sh_type == SHT_REL) { \ 558 if (sh_type == SHT_REL) { \
301 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \ 559 rel = REL ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
302 rela = NULL; \ 560 rela = NULL; \
303 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \ 561 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
304 } else if (sh_type == SHT_RELA) { \ 562 } else if (sh_type == SHT_RELA) { \
305 rel = NULL; \ 563 rel = NULL; \
306 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \ 564 rela = RELA ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
307 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \ 565 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
308 } else \ 566 } else \
309 continue; \ 567 continue; \
310 /* now see if any of the relocs are in the .text */ \ 568 /* now see if any of the relocs are in the .text */ \
311 for (r = 0; r < rmax; ++r) { \ 569 for (r = 0; r < rmax; ++r) { \
326 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \ 584 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
327 if (be_verbose <= 2) continue; \ 585 if (be_verbose <= 2) continue; \
328 } else \ 586 } else \
329 *found_textrels = 1; \ 587 *found_textrels = 1; \
330 /* locate this relocation symbol name */ \ 588 /* locate this relocation symbol name */ \
331 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 589 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
590 if ((void*)sym > elf->data_end) { \
591 warn("%s: corrupt ELF symbol", elf->filename); \
592 continue; \
593 } \
332 sym_max = ELF ## B ## _R_SYM(r_info); \ 594 sym_max = ELF ## B ## _R_SYM(r_info); \
333 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \ 595 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
334 sym += sym_max; \ 596 sym += sym_max; \
335 else \ 597 else \
336 sym = NULL; \ 598 sym = NULL; \
337 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 599 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
338 /* show the raw details about this reloc */ \ 600 /* show the raw details about this reloc */ \
339 printf(" %s: ", elf->base_filename); \ 601 printf(" %s: ", elf->base_filename); \
340 if (sym && sym->st_name) \ 602 if (sym && sym->st_name) \
341 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \ 603 printf("%s", elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
342 else \ 604 else \
343 printf("(memory/fake?)"); \ 605 printf("(memory/data?)"); \
344 printf(" [0x%lX]", (unsigned long)r_offset); \ 606 printf(" [0x%lX]", (unsigned long)r_offset); \
345 /* now try to find the closest symbol that this rel is probably in */ \ 607 /* now try to find the closest symbol that this rel is probably in */ \
346 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 608 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
347 func = NULL; \ 609 func = NULL; \
348 offset_tmp = 0; \ 610 offset_tmp = 0; \
349 while (sym_max--) { \ 611 while (sym_max--) { \
350 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \ 612 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
351 func = sym; \ 613 func = sym; \
352 offset_tmp = EGET(sym->st_value); \ 614 offset_tmp = EGET(sym->st_value); \
353 } \ 615 } \
354 ++sym; \ 616 ++sym; \
355 } \ 617 } \
356 printf(" in "); \ 618 printf(" in "); \
357 if (func && func->st_name) \ 619 if (func && func->st_name) { \
358 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \ 620 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
621 if (r_offset > EGET(func->st_size)) \
622 printf("(optimized out: previous %s)", func_name); \
359 else \ 623 else \
360 printf("(NULL: fake?)"); \ 624 printf("%s", func_name); \
625 } else \
626 printf("(optimized out)"); \
361 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \ 627 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
628 if (be_verbose && objdump) { \
629 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
630 char *sysbuf; \
631 size_t syslen; \
632 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"; \
633 syslen = sizeof(sysfmt) + strlen(objdump) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
634 sysbuf = xmalloc(syslen); \
635 if (end_addr < r_offset) \
636 /* not uncommon when things are optimized out */ \
637 end_addr = r_offset + 0x100; \
638 snprintf(sysbuf, syslen, sysfmt, \
639 objdump, \
640 (unsigned long)offset_tmp, \
641 (unsigned long)end_addr, \
642 elf->filename, \
643 (unsigned long)r_offset); \
644 fflush(stdout); \
645 if (system(sysbuf)) {/* don't care */} \
646 fflush(stdout); \
647 free(sysbuf); \
648 } \
362 } \ 649 } \
363 } } 650 } }
364 SHOW_TEXTRELS(32) 651 SHOW_TEXTRELS(32)
365 SHOW_TEXTRELS(64) 652 SHOW_TEXTRELS(64)
366 } 653 }
368 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename); 655 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
369 656
370 return NULL; 657 return NULL;
371} 658}
372 659
373static void rpath_security_checks(elfobj *, char *);
374static void rpath_security_checks(elfobj *elf, char *item) { 660static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
661{
375 struct stat st; 662 struct stat st;
376 switch (*item) { 663 switch (*item) {
377 case '/': break; 664 case '/': break;
378 case '.': 665 case '.':
379 warnf("Security problem with relative RPATH '%s' in %s", item, elf->filename); 666 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
380 break; 667 break;
668 case ':':
381 case '\0': 669 case '\0':
382 warnf("Security problem NULL RPATH in %s", elf->filename); 670 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
383 break; 671 break;
384 case '$': 672 case '$':
385 if (fstat(elf->fd, &st) != -1) 673 if (fstat(elf->fd, &st) != -1)
386 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID)) 674 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
387 warnf("Security problem with RPATH='%s' in %s with mode set of %o", 675 warnf("Security problem with %s='%s' in %s with mode set of %o",
388 item, elf->filename, st.st_mode & 07777); 676 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
389 break; 677 break;
390 default: 678 default:
391 warnf("Maybe? sec problem with RPATH='%s' in %s", item, elf->filename); 679 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
392 break; 680 break;
393 } 681 }
682 if (fix_elf)
683 warnf("Note: RPATH has been automatically fixed, but this should be fixed in the package itself");
394} 684}
395static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len) 685static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
396{ 686{
397 unsigned long i, s; 687 unsigned long i;
398 char *rpath, *runpath, **r; 688 char *rpath, *runpath, **r;
399 void *strtbl_void; 689 void *strtbl_void;
400 690
401 if (!show_rpath) return; 691 if (!show_rpath) return;
402 692
413 Elf ## B ## _Off offset; \ 703 Elf ## B ## _Off offset; \
414 Elf ## B ## _Xword word; \ 704 Elf ## B ## _Xword word; \
415 /* Scan all the program headers */ \ 705 /* Scan all the program headers */ \
416 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 706 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
417 /* Just scan dynamic headers */ \ 707 /* Just scan dynamic headers */ \
418 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 708 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
419 offset = EGET(phdr[i].p_offset); \ 709 offset = EGET(phdr[i].p_offset); \
420 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 710 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
421 /* Just scan dynamic RPATH/RUNPATH headers */ \ 711 /* Just scan dynamic RPATH/RUNPATH headers */ \
422 dyn = DYN ## B (elf->data + offset); \ 712 dyn = DYN ## B (elf->vdata + offset); \
423 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \ 713 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
424 if (word == DT_RPATH) { \ 714 if (word == DT_RPATH) { \
425 r = &rpath; \ 715 r = &rpath; \
426 } else if (word == DT_RUNPATH) { \ 716 } else if (word == DT_RUNPATH) { \
427 r = &runpath; \ 717 r = &runpath; \
431 } \ 721 } \
432 /* Verify the memory is somewhat sane */ \ 722 /* Verify the memory is somewhat sane */ \
433 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 723 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
434 if (offset < (Elf ## B ## _Off)elf->len) { \ 724 if (offset < (Elf ## B ## _Off)elf->len) { \
435 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \ 725 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
436 *r = (char*)(elf->data + offset); \ 726 *r = elf->data + offset; \
727 /* cache the length in case we need to nuke this section later on */ \
728 if (fix_elf) \
729 offset = strlen(*r); \
437 /* If quiet, don't output paths in ld.so.conf */ \ 730 /* If quiet, don't output paths in ld.so.conf */ \
438 if (be_quiet) { \ 731 if (be_quiet) { \
439 size_t len; \ 732 size_t len; \
440 char *start, *end; \ 733 char *start, *end; \
441 /* note that we only 'chop' off leading known paths. */ \ 734 /* note that we only 'chop' off leading known paths. */ \
442 /* since *r is read-only memory, we can only move the ptr forward. */ \ 735 /* since *r is read-only memory, we can only move the ptr forward. */ \
443 start = *r; \ 736 start = *r; \
444 /* scan each path in : delimited list */ \ 737 /* scan each path in : delimited list */ \
445 while (start) { \ 738 while (start) { \
446 rpath_security_checks(elf, start); \ 739 rpath_security_checks(elf, start, get_elfdtype(word)); \
447 end = strchr(start, ':'); \ 740 end = strchr(start, ':'); \
448 len = (end ? abs(end - start) : strlen(start)); \ 741 len = (end ? abs(end - start) : strlen(start)); \
449 for (s = 0; ldpaths[s]; ++s) { \ 742 if (use_ldcache) { \
743 size_t n; \
744 const char *ldpath; \
745 array_for_each(ldpaths, n, ldpath) \
450 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \ 746 if (!strncmp(ldpath, start, len) && !ldpath[len]) { \
451 *r = (end ? end + 1 : NULL); \ 747 *r = end; \
748 /* corner case ... if RPATH reads "/usr/lib:", we want \
749 * to show ':' rather than '' */ \
750 if (end && end[1] != '\0') \
751 (*r)++; \
452 break; \ 752 break; \
453 } \ 753 } \
454 } \ 754 } \
455 if (!*r || !ldpaths[s] || !end) \ 755 if (!*r || !end) \
456 start = NULL; \ 756 break; \
457 else \ 757 else \
458 start = start + len + 1; \ 758 start = start + len + 1; \
459 } \ 759 } \
460 } \ 760 } \
761 if (*r) { \
762 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
763 /* just nuke it */ \
764 nuke_it##B: \
765 memset(*r, 0x00, offset); \
766 *r = NULL; \
767 ESET(dyn->d_tag, DT_DEBUG); \
768 ESET(dyn->d_un.d_ptr, 0); \
769 } else if (fix_elf) { \
770 /* try to clean "bad" paths */ \
771 size_t len, tmpdir_len; \
772 char *start, *end; \
773 const char *tmpdir; \
774 start = *r; \
775 tmpdir = (getenv("TMPDIR") ? : "."); \
776 tmpdir_len = strlen(tmpdir); \
777 while (1) { \
778 end = strchr(start, ':'); \
779 if (start == end) { \
780 eat_this_path##B: \
781 len = strlen(end); \
782 memmove(start, end+1, len); \
783 start[len-1] = '\0'; \
784 end = start - 1; \
785 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
786 if (!end) { \
787 if (start == *r) \
788 goto nuke_it##B; \
789 *--start = '\0'; \
790 } else \
791 goto eat_this_path##B; \
792 } \
793 if (!end) \
794 break; \
795 start = end + 1; \
796 } \
797 if (**r == '\0') \
798 goto nuke_it##B; \
799 } \
800 if (*r) \
461 if (*r) *found_rpath = 1; \ 801 *found_rpath = 1; \
802 } \
462 } \ 803 } \
463 ++dyn; \ 804 ++dyn; \
464 } \ 805 } \
465 } } 806 } }
466 SHOW_RPATH(32) 807 SHOW_RPATH(32)
484 xstrcat(ret, (runpath ? runpath : rpath), ret_len); 825 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
485 else if (!be_quiet) 826 else if (!be_quiet)
486 xstrcat(ret, " - ", ret_len); 827 xstrcat(ret, " - ", ret_len);
487} 828}
488 829
830/* Defines can be seen in glibc's sysdeps/generic/ldconfig.h */
489#define LDSO_CACHE_MAGIC "ld.so-" 831#define LDSO_CACHE_MAGIC "ld.so-"
490#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1) 832#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
491#define LDSO_CACHE_VER "1.7.0" 833#define LDSO_CACHE_VER "1.7.0"
492#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1) 834#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
835#define FLAG_ANY -1
836#define FLAG_TYPE_MASK 0x00ff
837#define FLAG_LIBC4 0x0000
838#define FLAG_ELF 0x0001
839#define FLAG_ELF_LIBC5 0x0002
840#define FLAG_ELF_LIBC6 0x0003
841#define FLAG_REQUIRED_MASK 0xff00
842#define FLAG_SPARC_LIB64 0x0100
843#define FLAG_IA64_LIB64 0x0200
844#define FLAG_X8664_LIB64 0x0300
845#define FLAG_S390_LIB64 0x0400
846#define FLAG_POWERPC_LIB64 0x0500
847#define FLAG_MIPS64_LIBN32 0x0600
848#define FLAG_MIPS64_LIBN64 0x0700
849#define FLAG_X8664_LIBX32 0x0800
850#define FLAG_ARM_LIBHF 0x0900
851#define FLAG_AARCH64_LIB64 0x0a00
493 852
494static char *lookup_cache_lib(char *); 853#if defined(__GLIBC__) || defined(__UCLIBC__)
854
495static char *lookup_cache_lib(char *fname) 855static char *lookup_cache_lib(elfobj *elf, const char *fname)
496{ 856{
497 int fd = 0; 857 int fd;
498 char *strs; 858 char *strs;
499 static char buf[_POSIX_PATH_MAX] = ""; 859 static char buf[__PAX_UTILS_PATH_MAX] = "";
500 const char *cachefile = "/etc/ld.so.cache"; 860 const char *cachefile = root_rel_path("/etc/ld.so.cache");
501 struct stat st; 861 struct stat st;
502 862
503 typedef struct { 863 typedef struct {
504 char magic[LDSO_CACHE_MAGIC_LEN]; 864 char magic[LDSO_CACHE_MAGIC_LEN];
505 char version[LDSO_CACHE_VER_LEN]; 865 char version[LDSO_CACHE_VER_LEN];
506 int nlibs; 866 int nlibs;
507 } header_t; 867 } header_t;
868 header_t *header;
508 869
509 typedef struct { 870 typedef struct {
510 int flags; 871 int flags;
511 int sooffset; 872 int sooffset;
512 int liboffset; 873 int liboffset;
513 } libentry_t; 874 } libentry_t;
514
515 header_t *header;
516 libentry_t *libent; 875 libentry_t *libent;
517 876
518 if (fname == NULL) 877 if (fname == NULL)
519 return NULL; 878 return NULL;
520 879
521 if (ldcache == 0) { 880 if (ldcache == NULL) {
522 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) < 0) 881 if (fstatat(root_fd, cachefile, &st, 0))
523 return NULL; 882 return NULL;
524 /* save the cache size for latter unmapping */ 883
884 fd = openat(root_fd, cachefile, O_RDONLY);
885 if (fd == -1)
886 return NULL;
887
888 /* cache these values so we only map/unmap the cache file once */
525 ldcache_size = st.st_size; 889 ldcache_size = st.st_size;
890 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
891 close(fd);
526 892
527 if ((ldcache = mmap(0, st.st_size, PROT_READ, MAP_SHARED, fd, 0)) == (caddr_t) -1) 893 if (ldcache == MAP_FAILED) {
894 ldcache = NULL;
528 return NULL; 895 return NULL;
896 }
529 897
530 close(fd);
531
532 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN)) 898 if (memcmp(header->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN) ||
899 memcmp(header->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
900 {
901 munmap(ldcache, ldcache_size);
902 ldcache = NULL;
533 return NULL; 903 return NULL;
534
535 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
536 return NULL;
537 } 904 }
905 } else
906 header = ldcache;
538 907
539 header = (header_t *) ldcache;
540 libent = (libentry_t *) (ldcache + sizeof(header_t)); 908 libent = ldcache + sizeof(header_t);
541 strs = (char *) &libent[header->nlibs]; 909 strs = (char *) &libent[header->nlibs];
542 910
543 for (fd = 0; fd < header->nlibs; fd++) { 911 for (fd = 0; fd < header->nlibs; ++fd) {
912 /* This should be more fine grained, but for now we assume that
913 * diff arches will not be cached together, and we ignore the
914 * the different multilib mips cases.
915 */
916 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
917 continue;
918 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
919 continue;
920
544 if (strcmp(fname, strs + libent[fd].sooffset) != 0) 921 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
545 continue; 922 continue;
923
924 /* Return first hit because that is how the ldso rolls */
546 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf)); 925 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
926 break;
547 } 927 }
928
548 return buf; 929 return buf;
549} 930}
550 931
932#elif defined(__NetBSD__)
933static char *lookup_cache_lib(elfobj *elf, const char *fname)
934{
935 static char buf[__PAX_UTILS_PATH_MAX] = "";
936 static struct stat st;
937 size_t n;
938 char *ldpath;
939
940 array_for_each(ldpath, n, ldpath) {
941 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", ldpath, fname) >= sizeof(buf))
942 continue; /* if the pathname is too long, or something went wrong, ignore */
943
944 if (stat(buf, &st) != 0)
945 continue; /* if the lib doesn't exist in *ldpath, look further */
946
947 /* NetBSD doesn't actually do sanity checks, it just loads the file
948 * and if that doesn't work, continues looking in other directories.
949 * This cannot easily be safely emulated, unfortunately. For now,
950 * just assume that if it exists, it's a valid library. */
951
952 return buf;
953 }
954
955 /* not found in any path */
956 return NULL;
957}
958#else
959#ifdef __ELF__
960#warning Cache support not implemented for your target
961#endif
962static char *lookup_cache_lib(elfobj *elf, const char *fname)
963{
964 return NULL;
965}
966#endif
967
968static char *lookup_config_lib(const char *fname)
969{
970 static char buf[__PAX_UTILS_PATH_MAX] = "";
971 const char *ldpath;
972 size_t n;
973
974 array_for_each(ldpaths, n, ldpath) {
975 snprintf(buf, sizeof(buf), "%s/%s", root_rel_path(ldpath), fname);
976 if (faccessat(root_fd, buf, F_OK, AT_SYMLINK_NOFOLLOW) == 0)
977 return buf;
978 }
979
980 return NULL;
981}
551 982
552static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len) 983static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
553{ 984{
554 unsigned long i; 985 unsigned long i;
555 char *needed; 986 char *needed;
556 void *strtbl_void; 987 void *strtbl_void;
557 char *p; 988 char *p;
558 989
990 /*
991 * -n -> op==0 -> print all
992 * -N -> op==1 -> print requested
993 */
559 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL; 994 if ((op == 0 && !show_needed) || (op == 1 && !find_lib))
995 return NULL;
560 996
561 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 997 strtbl_void = elf_findsecbyname(elf, ".dynstr");
562 998
563 if (elf->phdr && strtbl_void) { 999 if (elf->phdr && strtbl_void) {
564#define SHOW_NEEDED(B) \ 1000#define SHOW_NEEDED(B) \
566 Elf ## B ## _Dyn *dyn; \ 1002 Elf ## B ## _Dyn *dyn; \
567 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 1003 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
568 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 1004 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
569 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 1005 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
570 Elf ## B ## _Off offset; \ 1006 Elf ## B ## _Off offset; \
1007 size_t matched = 0; \
1008 /* Walk all the program headers to find the PT_DYNAMIC */ \
571 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 1009 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
572 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 1010 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) \
1011 continue; \
573 offset = EGET(phdr[i].p_offset); \ 1012 offset = EGET(phdr[i].p_offset); \
574 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 1013 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
1014 continue; \
1015 /* Walk all the dynamic tags to find NEEDED entries */ \
575 dyn = DYN ## B (elf->data + offset); \ 1016 dyn = DYN ## B (elf->vdata + offset); \
576 while (EGET(dyn->d_tag) != DT_NULL) { \ 1017 while (EGET(dyn->d_tag) != DT_NULL) { \
577 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 1018 if (EGET(dyn->d_tag) == DT_NEEDED) { \
578 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 1019 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
579 if (offset >= (Elf ## B ## _Off)elf->len) { \ 1020 if (offset >= (Elf ## B ## _Off)elf->len) { \
580 ++dyn; \ 1021 ++dyn; \
581 continue; \ 1022 continue; \
582 } \ 1023 } \
583 needed = (char*)(elf->data + offset); \ 1024 needed = elf->data + offset; \
584 if (op == 0) { \ 1025 if (op == 0) { \
1026 /* -n -> print all entries */ \
585 if (!be_wewy_wewy_quiet) { \ 1027 if (!be_wewy_wewy_quiet) { \
586 if (*found_needed) xchrcat(ret, ',', ret_len); \ 1028 if (*found_needed) xchrcat(ret, ',', ret_len); \
587 if (printcache) \ 1029 if (use_ldpath) { \
588 if ((p = lookup_cache_lib(needed)) != NULL) \ 1030 if ((p = lookup_config_lib(needed)) != NULL) \
589 needed = p; \ 1031 needed = p; \
1032 } else if (use_ldcache) { \
1033 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
1034 needed = p; \
1035 } \
590 xstrcat(ret, needed, ret_len); \ 1036 xstrcat(ret, needed, ret_len); \
591 } \ 1037 } \
592 *found_needed = 1; \ 1038 *found_needed = 1; \
593 } else { \ 1039 } else { \
594 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \ 1040 /* -N -> print matching entries */ \
1041 size_t n; \
1042 const char *find_lib_name; \
1043 \
1044 array_for_each(find_lib_arr, n, find_lib_name) { \
1045 int invert = 1; \
1046 if (find_lib_name[0] == '!') \
1047 invert = 0, ++find_lib_name; \
1048 if (!strcmp(find_lib_name, needed) == invert) \
1049 ++matched; \
1050 } \
1051 \
1052 if (matched == array_cnt(find_lib_arr)) { \
595 *found_lib = 1; \ 1053 *found_lib = 1; \
596 return (be_wewy_wewy_quiet ? NULL : needed); \ 1054 return (be_wewy_wewy_quiet ? NULL : find_lib); \
597 } \ 1055 } \
598 } \ 1056 } \
599 } \ 1057 } \
600 ++dyn; \ 1058 ++dyn; \
601 } \ 1059 } \
623 *found_interp = 1; \ 1081 *found_interp = 1; \
624 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \ 1082 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
625 } 1083 }
626 SHOW_INTERP(32) 1084 SHOW_INTERP(32)
627 SHOW_INTERP(64) 1085 SHOW_INTERP(64)
1086 } else {
1087 /* Walk all the program headers to find the PT_INTERP */
1088#define SHOW_PT_INTERP(B) \
1089 if (elf->elf_class == ELFCLASS ## B) { \
1090 unsigned long i; \
1091 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1092 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1093 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1094 if (EGET(phdr[i].p_type) != PT_INTERP) \
1095 continue; \
1096 *found_interp = 1; \
1097 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(phdr[i].p_offset)); \
1098 } \
628 } 1099 }
1100 SHOW_PT_INTERP(32)
1101 SHOW_PT_INTERP(64)
1102 }
1103
629 return NULL; 1104 return NULL;
630} 1105}
631static char *scanelf_file_bind(elfobj *elf, char *found_bind) 1106static const char *scanelf_file_bind(elfobj *elf, char *found_bind)
632{ 1107{
633 unsigned long i; 1108 unsigned long i;
634 struct stat s; 1109 struct stat s;
1110 bool dynamic = false;
635 1111
636 if (!show_bind) return NULL; 1112 if (!show_bind) return NULL;
637 if (!elf->phdr) return NULL; 1113 if (!elf->phdr) return NULL;
638 1114
639#define SHOW_BIND(B) \ 1115#define SHOW_BIND(B) \
641 Elf ## B ## _Dyn *dyn; \ 1117 Elf ## B ## _Dyn *dyn; \
642 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 1118 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
643 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 1119 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
644 Elf ## B ## _Off offset; \ 1120 Elf ## B ## _Off offset; \
645 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 1121 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
646 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 1122 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1123 dynamic = true; \
647 offset = EGET(phdr[i].p_offset); \ 1124 offset = EGET(phdr[i].p_offset); \
648 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 1125 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
649 dyn = DYN ## B (elf->data + offset); \ 1126 dyn = DYN ## B (elf->vdata + offset); \
650 while (EGET(dyn->d_tag) != DT_NULL) { \ 1127 while (EGET(dyn->d_tag) != DT_NULL) { \
651 if (EGET(dyn->d_tag) == DT_BIND_NOW || \ 1128 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
652 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \ 1129 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
653 { \ 1130 { \
654 if (be_quiet) return NULL; \ 1131 if (be_quiet) return NULL; \
662 SHOW_BIND(32) 1139 SHOW_BIND(32)
663 SHOW_BIND(64) 1140 SHOW_BIND(64)
664 1141
665 if (be_wewy_wewy_quiet) return NULL; 1142 if (be_wewy_wewy_quiet) return NULL;
666 1143
1144 /* don't output anything if quiet mode and the ELF is static or not setuid */
667 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) { 1145 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
668 return NULL; 1146 return NULL;
669 } else { 1147 } else {
670 *found_bind = 1; 1148 *found_bind = 1;
671 return (char *) "LAZY"; 1149 return dynamic ? "LAZY" : "STATIC";
672 } 1150 }
673} 1151}
674static char *scanelf_file_soname(elfobj *elf, char *found_soname) 1152static char *scanelf_file_soname(elfobj *elf, char *found_soname)
675{ 1153{
676 unsigned long i; 1154 unsigned long i;
688 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 1166 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
689 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 1167 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
690 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 1168 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
691 Elf ## B ## _Off offset; \ 1169 Elf ## B ## _Off offset; \
692 /* only look for soname in shared objects */ \ 1170 /* only look for soname in shared objects */ \
693 if (ehdr->e_type != ET_DYN) \ 1171 if (EGET(ehdr->e_type) != ET_DYN) \
694 return NULL; \ 1172 return NULL; \
695 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 1173 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
696 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 1174 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
697 offset = EGET(phdr[i].p_offset); \ 1175 offset = EGET(phdr[i].p_offset); \
698 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 1176 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
699 dyn = DYN ## B (elf->data + offset); \ 1177 dyn = DYN ## B (elf->vdata + offset); \
700 while (EGET(dyn->d_tag) != DT_NULL) { \ 1178 while (EGET(dyn->d_tag) != DT_NULL) { \
701 if (EGET(dyn->d_tag) == DT_SONAME) { \ 1179 if (EGET(dyn->d_tag) == DT_SONAME) { \
702 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 1180 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
703 if (offset >= (Elf ## B ## _Off)elf->len) { \ 1181 if (offset >= (Elf ## B ## _Off)elf->len) { \
704 ++dyn; \ 1182 ++dyn; \
705 continue; \ 1183 continue; \
706 } \ 1184 } \
707 soname = (char*)(elf->data + offset); \ 1185 soname = elf->data + offset; \
708 *found_soname = 1; \ 1186 *found_soname = 1; \
709 return (be_wewy_wewy_quiet ? NULL : soname); \ 1187 return (be_wewy_wewy_quiet ? NULL : soname); \
710 } \ 1188 } \
711 ++dyn; \ 1189 ++dyn; \
712 } \ 1190 } \
715 SHOW_SONAME(64) 1193 SHOW_SONAME(64)
716 } 1194 }
717 1195
718 return NULL; 1196 return NULL;
719} 1197}
1198
1199/*
1200 * We support the symbol form:
1201 * [%[modifiers]%][[+-]<symbol name>][,[.....]]
1202 * If the symbol name is empty, then all symbols are matched.
1203 * If the symbol name is a glob ("*"), then all symbols are dumped (debug).
1204 * Do not rely on this output format at all.
1205 * Otherwise the symbol name is used to search (either regex or string compare).
1206 * If the first char of the symbol name is a plus ("+"), then only match
1207 * defined symbols. If it's a minus ("-"), only match undefined symbols.
1208 * Putting modifiers in between the percent signs allows for more in depth
1209 * filters. There are groups of modifiers. If you don't specify a member
1210 * of a group, then all types in that group are matched. The current
1211 * groups and their types are:
1212 * STT group: STT_NOTYPE:n STT_OBJECT:o STT_FUNC:f STT_FILE:F
1213 * STB group: STB_LOCAL:l STB_GLOBAL:g STB_WEAK:w
1214 * STV group: STV_DEFAULT:p STV_INTERNAL:i STV_HIDDEN:h STV_PROTECTED:P
1215 * SHN group: SHN_UNDEF:u SHN_ABS:a SHN_COMMON:c {defined}:d
1216 * The "defined" value in the SHN group does not correspond to a SHN_xxx define.
1217 * You can search for multiple symbols at once by seperating with a comma (",").
1218 *
1219 * Some examples:
1220 * ELFs with a weak function "foo":
1221 * scanelf -s %wf%foo <ELFs>
1222 * ELFs that define the symbol "main":
1223 * scanelf -s +main <ELFs>
1224 * scanelf -s %d%main <ELFs>
1225 * ELFs that refer to the undefined symbol "brk":
1226 * scanelf -s -brk <ELFs>
1227 * scanelf -s %u%brk <ELFs>
1228 * All global defined objects in an ELF:
1229 * scanelf -s %ogd% <ELF>
1230 */
1231static void
1232scanelf_match_symname(elfobj *elf, char *found_sym, char **ret, size_t *ret_len, const char *symname,
1233 unsigned int stt, unsigned int stb, unsigned int stv, unsigned int shn, unsigned long size)
1234{
1235 const char *this_sym;
1236 size_t n;
1237
1238 array_for_each(find_sym_arr, n, this_sym) {
1239 bool inc_notype, inc_object, inc_func, inc_file,
1240 inc_local, inc_global, inc_weak,
1241 inc_visdef, inc_intern, inc_hidden, inc_prot,
1242 inc_def, inc_undef, inc_abs, inc_common;
1243
1244 /* symbol selection! */
1245 inc_notype = inc_object = inc_func = inc_file =
1246 inc_local = inc_global = inc_weak =
1247 inc_visdef = inc_intern = inc_hidden = inc_prot =
1248 inc_def = inc_undef = inc_abs = inc_common =
1249 (*this_sym != '%');
1250
1251 /* parse the contents of %...% */
1252 if (!inc_notype) {
1253 while (*(this_sym++)) {
1254 if (*this_sym == '%') {
1255 ++this_sym;
1256 break;
1257 }
1258 switch (*this_sym) {
1259 case 'n': inc_notype = true; break;
1260 case 'o': inc_object = true; break;
1261 case 'f': inc_func = true; break;
1262 case 'F': inc_file = true; break;
1263 case 'l': inc_local = true; break;
1264 case 'g': inc_global = true; break;
1265 case 'w': inc_weak = true; break;
1266 case 'p': inc_visdef = true; break;
1267 case 'i': inc_intern = true; break;
1268 case 'h': inc_hidden = true; break;
1269 case 'P': inc_prot = true; break;
1270 case 'd': inc_def = true; break;
1271 case 'u': inc_undef = true; break;
1272 case 'a': inc_abs = true; break;
1273 case 'c': inc_common = true; break;
1274 default: err("invalid symbol selector '%c'", *this_sym);
1275 }
1276 }
1277
1278 /* If no types are matched, not match all */
1279 if (!inc_notype && !inc_object && !inc_func && !inc_file)
1280 inc_notype = inc_object = inc_func = inc_file = true;
1281 if (!inc_local && !inc_global && !inc_weak)
1282 inc_local = inc_global = inc_weak = true;
1283 if (!inc_visdef && !inc_intern && !inc_hidden && !inc_prot)
1284 inc_visdef = inc_intern = inc_hidden = inc_prot = true;
1285 if (!inc_def && !inc_undef && !inc_abs && !inc_common)
1286 inc_def = inc_undef = inc_abs = inc_common = true;
1287
1288 /* backwards compat for defined/undefined short hand */
1289 } else if (*this_sym == '+') {
1290 inc_undef = false;
1291 ++this_sym;
1292 } else if (*this_sym == '-') {
1293 inc_def = inc_abs = inc_common = false;
1294 ++this_sym;
1295 }
1296
1297 /* filter symbols */
1298 if ((!inc_notype && stt == STT_NOTYPE ) || \
1299 (!inc_object && stt == STT_OBJECT ) || \
1300 (!inc_func && stt == STT_FUNC ) || \
1301 (!inc_file && stt == STT_FILE ) || \
1302 (!inc_local && stb == STB_LOCAL ) || \
1303 (!inc_global && stb == STB_GLOBAL ) || \
1304 (!inc_weak && stb == STB_WEAK ) || \
1305 (!inc_visdef && stv == STV_DEFAULT ) || \
1306 (!inc_intern && stv == STV_INTERNAL ) || \
1307 (!inc_hidden && stv == STV_HIDDEN ) || \
1308 (!inc_prot && stv == STV_PROTECTED) || \
1309 (!inc_def && shn && shn < SHN_LORESERVE) || \
1310 (!inc_undef && shn == SHN_UNDEF ) || \
1311 (!inc_abs && shn == SHN_ABS ) || \
1312 (!inc_common && shn == SHN_COMMON ))
1313 continue;
1314
1315 if (*this_sym == '*') {
1316 /* a "*" symbol gets you debug output */
1317 printf("%s(%s) %5lX %-15s %-15s %-15s %-15s %s\n",
1318 ((*found_sym == 0) ? "\n\t" : "\t"),
1319 elf->base_filename,
1320 size,
1321 get_elfstttype(stt),
1322 get_elfstbtype(stb),
1323 get_elfstvtype(stv),
1324 get_elfshntype(shn),
1325 symname);
1326 goto matched;
1327
1328 } else {
1329 if (g_match) {
1330 /* regex match the symbol */
1331 if (regexec(find_sym_regex_arr->eles[n], symname, 0, NULL, 0) == REG_NOMATCH)
1332 continue;
1333
1334 } else if (*this_sym) {
1335 /* give empty symbols a "pass", else do a normal compare */
1336 const size_t len = strlen(this_sym);
1337 if (!(strncmp(this_sym, symname, len) == 0 &&
1338 /* Accept unversioned symbol names */
1339 (symname[len] == '\0' || symname[len] == '@')))
1340 continue;
1341 }
1342
1343 if (be_semi_verbose) {
1344 char buf[1024];
1345 snprintf(buf, sizeof(buf), "%lX %s %s",
1346 size,
1347 get_elfstttype(stt),
1348 this_sym);
1349 *ret = xstrdup(buf);
1350 } else {
1351 if (*ret) xchrcat(ret, ',', ret_len);
1352 xstrcat(ret, symname, ret_len);
1353 }
1354
1355 goto matched;
1356 }
1357 }
1358
1359 return;
1360
1361 matched:
1362 *found_sym = 1;
1363}
1364
720static char *scanelf_file_sym(elfobj *elf, char *found_sym) 1365static const char *scanelf_file_sym(elfobj *elf, char *found_sym)
721{ 1366{
722 unsigned long i;
723 char *ret; 1367 char *ret;
724 void *symtab_void, *strtab_void; 1368 void *symtab_void, *strtab_void;
725 1369
726 if (!find_sym) return NULL; 1370 if (!find_sym) return NULL;
727 ret = find_sym; 1371 ret = NULL;
728 1372
729 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void); 1373 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
730 1374
731 if (symtab_void && strtab_void) { 1375 if (symtab_void && strtab_void) {
732#define FIND_SYM(B) \ 1376#define FIND_SYM(B) \
733 if (elf->elf_class == ELFCLASS ## B) { \ 1377 if (elf->elf_class == ELFCLASS ## B) { \
734 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 1378 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
735 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 1379 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
736 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 1380 Elf ## B ## _Sym *sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
737 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 1381 Elf ## B ## _Word i, cnt = EGET(symtab->sh_entsize); \
738 char *symname; \ 1382 char *symname; \
1383 size_t ret_len = 0; \
1384 if (cnt) \
1385 cnt = EGET(symtab->sh_size) / cnt; \
739 for (i = 0; i < cnt; ++i) { \ 1386 for (i = 0; i < cnt; ++i) { \
1387 if ((void*)sym > elf->data_end) { \
1388 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1389 goto break_out; \
1390 } \
740 if (sym->st_name) { \ 1391 if (sym->st_name) { \
1392 /* make sure the symbol name is in acceptable memory range */ \
741 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 1393 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
742 if (*find_sym == '*') { \ 1394 if ((void*)symname > elf->data_end) { \
743 printf("%s(%s) %5lX %15s %s\n", \ 1395 warnf("%s: corrupt ELF symbols", elf->filename); \
744 ((*found_sym == 0) ? "\n\t" : "\t"), \ 1396 ++sym; \
745 elf->base_filename, \ 1397 continue; \
746 (unsigned long)sym->st_size, \
747 get_elfstttype(sym->st_info), \
748 symname); \
749 *found_sym = 1; \
750 } else { \
751 char *this_sym, *next_sym; \
752 this_sym = find_sym; \
753 do { \
754 next_sym = strchr(this_sym, ','); \
755 if (next_sym == NULL) \
756 next_sym = this_sym + strlen(this_sym); \
757 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
758 (strcmp(symname, versioned_symname) == 0)) { \
759 ret = this_sym; \
760 (*found_sym)++; \
761 goto break_out; \
762 } \
763 this_sym = next_sym + 1; \
764 } while (*next_sym != '\0'); \
765 } \ 1398 } \
1399 scanelf_match_symname(elf, found_sym, \
1400 &ret, &ret_len, symname, \
1401 ELF##B##_ST_TYPE(EGET(sym->st_info)), \
1402 ELF##B##_ST_BIND(EGET(sym->st_info)), \
1403 ELF##B##_ST_VISIBILITY(EGET(sym->st_other)), \
1404 EGET(sym->st_shndx), \
1405 /* st_size can be 64bit, but no one is really that big, so screw em */ \
1406 EGET(sym->st_size)); \
766 } \ 1407 } \
767 ++sym; \ 1408 ++sym; \
768 } } 1409 } \
1410 }
769 FIND_SYM(32) 1411 FIND_SYM(32)
770 FIND_SYM(64) 1412 FIND_SYM(64)
771 } 1413 }
772 1414
773break_out: 1415break_out:
776 if (*find_sym != '*' && *found_sym) 1418 if (*find_sym != '*' && *found_sym)
777 return ret; 1419 return ret;
778 if (be_quiet) 1420 if (be_quiet)
779 return NULL; 1421 return NULL;
780 else 1422 else
781 return (char *)" - "; 1423 return " - ";
782} 1424}
1425
1426static const char *scanelf_file_sections(elfobj *elf, char *found_section)
1427{
1428 if (!find_section)
1429 return NULL;
1430
1431#define FIND_SECTION(B) \
1432 if (elf->elf_class == ELFCLASS ## B) { \
1433 size_t matched, n; \
1434 int invert; \
1435 const char *section_name; \
1436 Elf ## B ## _Shdr *section; \
1437 \
1438 matched = 0; \
1439 array_for_each(find_section_arr, n, section_name) { \
1440 invert = (*section_name == '!' ? 1 : 0); \
1441 section = SHDR ## B (elf_findsecbyname(elf, section_name + invert)); \
1442 if ((section == NULL && invert) || (section != NULL && !invert)) \
1443 ++matched; \
1444 } \
1445 \
1446 if (matched == array_cnt(find_section_arr)) \
1447 *found_section = 1; \
1448 }
1449 FIND_SECTION(32)
1450 FIND_SECTION(64)
1451
1452 if (be_wewy_wewy_quiet)
1453 return NULL;
1454
1455 if (*found_section)
1456 return find_section;
1457
1458 if (be_quiet)
1459 return NULL;
1460 else
1461 return " - ";
1462}
1463
783/* scan an elf file and show all the fun stuff */ 1464/* scan an elf file and show all the fun stuff */
784#define prints(str) write(fileno(stdout), str, strlen(str)) 1465#define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
785static void scanelf_file(const char *filename) 1466static int scanelf_elfobj(elfobj *elf)
786{ 1467{
787 unsigned long i; 1468 unsigned long i;
788 char found_pax, found_phdr, found_relro, found_load, found_textrel, 1469 char found_pax, found_phdr, found_relro, found_load, found_textrel,
789 found_rpath, found_needed, found_interp, found_bind, found_soname, 1470 found_rpath, found_needed, found_interp, found_bind, found_soname,
790 found_sym, found_lib, found_file, found_textrels; 1471 found_sym, found_lib, found_file, found_textrels, found_section;
791 elfobj *elf;
792 struct stat st;
793 static char *out_buffer = NULL; 1472 static char *out_buffer = NULL;
794 static size_t out_len; 1473 static size_t out_len;
795 1474
796 /* make sure 'filename' exists */
797 if (lstat(filename, &st) == -1) {
798 if (be_verbose > 2) printf("%s: does not exist\n", filename);
799 return;
800 }
801 /* always handle regular files and handle symlinked files if no -y */
802 if (S_ISLNK(st.st_mode)) {
803 if (!scan_symlink) return;
804 stat(filename, &st);
805 }
806 if (!S_ISREG(st.st_mode)) {
807 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
808 return;
809 }
810
811 found_pax = found_phdr = found_relro = found_load = found_textrel = \ 1475 found_pax = found_phdr = found_relro = found_load = found_textrel = \
812 found_rpath = found_needed = found_interp = found_bind = found_soname = \ 1476 found_rpath = found_needed = found_interp = found_bind = found_soname = \
813 found_sym = found_lib = found_file = found_textrels = 0; 1477 found_sym = found_lib = found_file = found_textrels = found_section = 0;
814 1478
815 /* verify this is real ELF */
816 if ((elf = readelf(filename)) == NULL) {
817 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
818 return;
819 }
820
821 if (be_verbose > 1) 1479 if (be_verbose > 2)
822 printf("%s: scanning file {%s,%s}\n", filename, 1480 printf("%s: scanning file {%s,%s}\n", elf->filename,
823 get_elfeitype(EI_CLASS, elf->elf_class), 1481 get_elfeitype(EI_CLASS, elf->elf_class),
824 get_elfeitype(EI_DATA, elf->data[EI_DATA])); 1482 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
825 else if (be_verbose) 1483 else if (be_verbose > 1)
826 printf("%s: scanning file\n", filename); 1484 printf("%s: scanning file\n", elf->filename);
827 1485
828 /* init output buffer */ 1486 /* init output buffer */
829 if (!out_buffer) { 1487 if (!out_buffer) {
830 out_len = sizeof(char) * 80; 1488 out_len = sizeof(char) * 80;
831 out_buffer = (char*)xmalloc(out_len); 1489 out_buffer = xmalloc(out_len);
832 } 1490 }
833 *out_buffer = '\0'; 1491 *out_buffer = '\0';
834 1492
835 /* show the header */ 1493 /* show the header */
836 if (!be_quiet && show_banner) { 1494 if (!be_quiet && show_banner) {
837 for (i = 0; out_format[i]; ++i) { 1495 for (i = 0; out_format[i]; ++i) {
838 if (!IS_MODIFIER(out_format[i])) continue; 1496 if (!IS_MODIFIER(out_format[i])) continue;
839 1497
840 switch (out_format[++i]) { 1498 switch (out_format[++i]) {
1499 case '+': break;
841 case '%': break; 1500 case '%': break;
842 case '#': break; 1501 case '#': break;
843 case 'F': 1502 case 'F':
844 case 'p': 1503 case 'p':
845 case 'f': prints("FILE "); found_file = 1; break; 1504 case 'f': prints("FILE "); found_file = 1; break;
846 case 'o': prints(" TYPE "); break; 1505 case 'o': prints(" TYPE "); break;
847 case 'x': prints(" PAX "); break; 1506 case 'x': prints(" PAX "); break;
848 case 'e': prints("STK/REL/PTL "); break; 1507 case 'e': prints("STK/REL/PTL "); break;
849 case 't': prints("TEXTREL "); break; 1508 case 't': prints("TEXTREL "); break;
850 case 'r': prints("RPATH "); break; 1509 case 'r': prints("RPATH "); break;
1510 case 'M': prints("CLASS "); break;
1511 case 'l':
851 case 'n': prints("NEEDED "); break; 1512 case 'n': prints("NEEDED "); break;
852 case 'i': prints("INTERP "); break; 1513 case 'i': prints("INTERP "); break;
853 case 'b': prints("BIND "); break; 1514 case 'b': prints("BIND "); break;
1515 case 'Z': prints("SIZE "); break;
854 case 'S': prints("SONAME "); break; 1516 case 'S': prints("SONAME "); break;
855 case 's': prints("SYM "); break; 1517 case 's': prints("SYM "); break;
856 case 'N': prints("LIB "); break; 1518 case 'N': prints("LIB "); break;
857 case 'T': prints("TEXTRELS "); break; 1519 case 'T': prints("TEXTRELS "); break;
1520 case 'k': prints("SECTION "); break;
1521 case 'a': prints("ARCH "); break;
1522 case 'I': prints("OSABI "); break;
1523 case 'Y': prints("EABI "); break;
1524 case 'O': prints("PERM "); break;
1525 case 'D': prints("ENDIAN "); break;
858 default: warnf("'%c' has no title ?", out_format[i]); 1526 default: warnf("'%c' has no title ?", out_format[i]);
859 } 1527 }
860 } 1528 }
861 if (!found_file) prints("FILE "); 1529 if (!found_file) prints("FILE ");
862 prints("\n"); 1530 prints("\n");
866 1534
867 /* dump all the good stuff */ 1535 /* dump all the good stuff */
868 for (i = 0; out_format[i]; ++i) { 1536 for (i = 0; out_format[i]; ++i) {
869 const char *out; 1537 const char *out;
870 const char *tmp; 1538 const char *tmp;
871 1539 static char ubuf[sizeof(unsigned long)*2];
872 /* make sure we trim leading spaces in quiet mode */
873 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
874 *out_buffer = '\0';
875
876 if (!IS_MODIFIER(out_format[i])) { 1540 if (!IS_MODIFIER(out_format[i])) {
877 xchrcat(&out_buffer, out_format[i], &out_len); 1541 xchrcat(&out_buffer, out_format[i], &out_len);
878 continue; 1542 continue;
879 } 1543 }
880 1544
881 out = NULL; 1545 out = NULL;
882 be_wewy_wewy_quiet = (out_format[i] == '#'); 1546 be_wewy_wewy_quiet = (out_format[i] == '#');
1547 be_semi_verbose = (out_format[i] == '+');
883 switch (out_format[++i]) { 1548 switch (out_format[++i]) {
1549 case '+':
884 case '%': 1550 case '%':
885 case '#': 1551 case '#':
886 xchrcat(&out_buffer, out_format[i], &out_len); break; 1552 xchrcat(&out_buffer, out_format[i], &out_len); break;
887 case 'F': 1553 case 'F':
888 found_file = 1; 1554 found_file = 1;
889 if (be_wewy_wewy_quiet) break; 1555 if (be_wewy_wewy_quiet) break;
890 xstrcat(&out_buffer, filename, &out_len); 1556 xstrcat(&out_buffer, elf->filename, &out_len);
891 break; 1557 break;
892 case 'p': 1558 case 'p':
893 found_file = 1; 1559 found_file = 1;
894 if (be_wewy_wewy_quiet) break; 1560 if (be_wewy_wewy_quiet) break;
895 tmp = filename; 1561 tmp = elf->filename;
896 if (search_path) { 1562 if (search_path) {
897 ssize_t len_search = strlen(search_path); 1563 ssize_t len_search = strlen(search_path);
898 ssize_t len_file = strlen(filename); 1564 ssize_t len_file = strlen(elf->filename);
899 if (!strncmp(filename, search_path, len_search) && \ 1565 if (!strncmp(elf->filename, search_path, len_search) && \
900 len_file > len_search) 1566 len_file > len_search)
901 tmp += len_search; 1567 tmp += len_search;
902 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++; 1568 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
903 } 1569 }
904 xstrcat(&out_buffer, tmp, &out_len); 1570 xstrcat(&out_buffer, tmp, &out_len);
905 break; 1571 break;
906 case 'f': 1572 case 'f':
907 found_file = 1; 1573 found_file = 1;
908 if (be_wewy_wewy_quiet) break; 1574 if (be_wewy_wewy_quiet) break;
909 tmp = strrchr(filename, '/'); 1575 tmp = strrchr(elf->filename, '/');
910 tmp = (tmp == NULL ? filename : tmp+1); 1576 tmp = (tmp == NULL ? elf->filename : tmp+1);
911 xstrcat(&out_buffer, tmp, &out_len); 1577 xstrcat(&out_buffer, tmp, &out_len);
912 break; 1578 break;
913 case 'o': out = get_elfetype(elf); break; 1579 case 'o': out = get_elfetype(elf); break;
914 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1580 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
915 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break; 1581 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
916 case 't': out = scanelf_file_textrel(elf, &found_textrel); break; 1582 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
917 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break; 1583 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
918 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break; 1584 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1585 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1586 case 'D': out = get_endian(elf); break;
1587 case 'O': out = strfileperms(elf->filename); break;
919 case 'n': 1588 case 'n':
920 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break; 1589 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
921 case 'i': out = scanelf_file_interp(elf, &found_interp); break; 1590 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
922 case 'b': out = scanelf_file_bind(elf, &found_bind); break; 1591 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
923 case 'S': out = scanelf_file_soname(elf, &found_soname); break; 1592 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
924 case 's': out = scanelf_file_sym(elf, &found_sym); break; 1593 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1594 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1595 case 'a': out = get_elfemtype(elf); break;
1596 case 'I': out = get_elfosabi(elf); break;
1597 case 'Y': out = get_elf_eabi(elf); break;
1598 case 'Z': snprintf(ubuf, sizeof(ubuf), "%lu", (unsigned long)elf->len); out = ubuf; break;;
925 default: warnf("'%c' has no scan code?", out_format[i]); 1599 default: warnf("'%c' has no scan code?", out_format[i]);
926 } 1600 }
927 if (out) { 1601 if (out)
928 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
929 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
930 xstrncat(&out_buffer, out, &out_len, (tmp-out));
931 else
932 xstrcat(&out_buffer, out, &out_len); 1602 xstrcat(&out_buffer, out, &out_len);
933 }
934 } 1603 }
935 1604
936#define FOUND_SOMETHING() \ 1605#define FOUND_SOMETHING() \
937 (found_pax || found_phdr || found_relro || found_load || found_textrel || \ 1606 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
938 found_rpath || found_needed || found_interp || found_bind || \ 1607 found_rpath || found_needed || found_interp || found_bind || \
939 found_soname || found_sym || found_lib || found_textrels) 1608 found_soname || found_sym || found_lib || found_textrels || found_section )
940 1609
941 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) { 1610 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
942 xchrcat(&out_buffer, ' ', &out_len); 1611 xchrcat(&out_buffer, ' ', &out_len);
943 xstrcat(&out_buffer, filename, &out_len); 1612 xstrcat(&out_buffer, elf->filename, &out_len);
944 } 1613 }
945 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) { 1614 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
946 puts(out_buffer); 1615 puts(out_buffer);
947 fflush(stdout); 1616 fflush(stdout);
948 } 1617 }
949 1618
1619 return 0;
1620}
1621
1622/* scan a single elf */
1623static int scanelf_elf(const char *filename, int fd, size_t len)
1624{
1625 int ret = 1;
1626 size_t n;
1627 const char *match_etype;
1628 elfobj *elf;
1629
1630 /* Verify this is a real ELF */
1631 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1632 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1633 return 2;
1634 }
1635
1636 /* Possibly filter based on ELF bitness */
1637 switch (match_bits) {
1638 case 32:
1639 if (elf->elf_class != ELFCLASS32)
1640 goto done;
1641 break;
1642 case 64:
1643 if (elf->elf_class != ELFCLASS64)
1644 goto done;
1645 break;
1646 }
1647
1648 /* Possibly filter based on the ELF's e_type field */
1649 array_for_each(match_etypes, n, match_etype)
1650 if (etype_lookup(match_etype) == get_etype(elf))
1651 goto scanit;
1652 if (array_cnt(match_etypes))
1653 goto done;
1654
1655 scanit:
1656 ret = scanelf_elfobj(elf);
1657
1658 done:
950 unreadelf(elf); 1659 unreadelf(elf);
1660 return ret;
1661}
1662
1663/* scan an archive of elfs */
1664static int scanelf_archive(const char *filename, int fd, size_t len)
1665{
1666 archive_handle *ar;
1667 archive_member *m;
1668 char *ar_buffer;
1669 elfobj *elf;
1670
1671 ar = ar_open_fd(filename, fd);
1672 if (ar == NULL)
1673 return 1;
1674
1675 ar_buffer = mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1676 while ((m = ar_next(ar)) != NULL) {
1677 off_t cur_pos = lseek(fd, 0, SEEK_CUR);
1678 if (cur_pos == -1)
1679 errp("lseek() failed");
1680 elf = readelf_buffer(m->name, ar_buffer + cur_pos, m->size);
1681 if (elf) {
1682 scanelf_elfobj(elf);
1683 unreadelf(elf);
1684 }
1685 }
1686 munmap(ar_buffer, len);
1687
1688 return 0;
1689}
1690/* scan a file which may be an elf or an archive or some other magical beast */
1691static int scanelf_fileat(int dir_fd, const char *filename, const struct stat *st_cache)
1692{
1693 const struct stat *st = st_cache;
1694 struct stat symlink_st;
1695 int fd;
1696
1697 /* always handle regular files and handle symlinked files if no -y */
1698 if (S_ISLNK(st->st_mode)) {
1699 if (!scan_symlink)
1700 return 1;
1701 fstatat(dir_fd, filename, &symlink_st, 0);
1702 st = &symlink_st;
1703 }
1704
1705 if (!S_ISREG(st->st_mode)) {
1706 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1707 return 1;
1708 }
1709
1710 if (match_perms) {
1711 if ((st->st_mode | match_perms) != st->st_mode)
1712 return 1;
1713 }
1714 fd = openat(dir_fd, filename, (fix_elf ? O_RDWR : O_RDONLY) | O_CLOEXEC);
1715 if (fd == -1) {
1716 if (fix_elf && errno == ETXTBSY)
1717 warnp("%s: could not fix", filename);
1718 else if (be_verbose > 2)
1719 printf("%s: skipping file: %s\n", filename, strerror(errno));
1720 return 1;
1721 }
1722
1723 if (scanelf_elf(filename, fd, st->st_size) == 2) {
1724 /* if it isn't an ELF, maybe it's an .a archive */
1725 if (scan_archives)
1726 scanelf_archive(filename, fd, st->st_size);
1727
1728 /*
1729 * unreadelf() implicitly closes its fd, so only close it
1730 * when we are returning it in the non-ELF case
1731 */
1732 close(fd);
1733 }
1734
1735 return 0;
951} 1736}
952 1737
953/* scan a directory for ET_EXEC files and print when we find one */ 1738/* scan a directory for ET_EXEC files and print when we find one */
954static void scanelf_dir(const char *path) 1739static int scanelf_dirat(int dir_fd, const char *path)
955{ 1740{
956 register DIR *dir; 1741 register DIR *dir;
957 register struct dirent *dentry; 1742 register struct dirent *dentry;
958 struct stat st_top, st; 1743 struct stat st_top, st;
959 char buf[_POSIX_PATH_MAX]; 1744 char buf[__PAX_UTILS_PATH_MAX], *subpath;
960 size_t pathlen = 0, len = 0; 1745 size_t pathlen = 0, len = 0;
1746 int ret = 0;
1747 int subdir_fd;
961 1748
962 /* make sure path exists */ 1749 /* make sure path exists */
963 if (lstat(path, &st_top) == -1) { 1750 if (fstatat(dir_fd, path, &st_top, AT_SYMLINK_NOFOLLOW) == -1) {
964 if (be_verbose > 2) printf("%s: does not exist\n", path); 1751 if (be_verbose > 2) printf("%s: does not exist\n", path);
965 return; 1752 return 1;
966 } 1753 }
967 1754
968 /* ok, if it isn't a directory, assume we can open it */ 1755 /* ok, if it isn't a directory, assume we can open it */
969 if (!S_ISDIR(st_top.st_mode)) { 1756 if (!S_ISDIR(st_top.st_mode))
970 scanelf_file(path); 1757 return scanelf_fileat(dir_fd, path, &st_top);
971 return;
972 }
973 1758
974 /* now scan the dir looking for fun stuff */ 1759 /* now scan the dir looking for fun stuff */
975 if ((dir = opendir(path)) == NULL) { 1760 subdir_fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
976 warnf("could not opendir %s: %s", path, strerror(errno)); 1761 if (subdir_fd == -1)
1762 dir = NULL;
1763 else
1764 dir = fdopendir(subdir_fd);
1765 if (dir == NULL) {
1766 if (subdir_fd != -1)
1767 close(subdir_fd);
1768 else if (be_verbose > 2)
1769 printf("%s: skipping dir: %s\n", path, strerror(errno));
977 return; 1770 return 1;
978 } 1771 }
979 if (be_verbose) printf("%s: scanning dir\n", path); 1772 if (be_verbose > 1) printf("%s: scanning dir\n", path);
980 1773
981 pathlen = strlen(path); 1774 subpath = stpcpy(buf, path);
1775 if (subpath[-1] != '/')
1776 *subpath++ = '/';
1777 pathlen = subpath - buf;
982 while ((dentry = readdir(dir))) { 1778 while ((dentry = readdir(dir))) {
983 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1779 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
984 continue; 1780 continue;
1781
1782 if (fstatat(subdir_fd, dentry->d_name, &st, AT_SYMLINK_NOFOLLOW) == -1)
1783 continue;
1784
985 len = (pathlen + 1 + strlen(dentry->d_name) + 1); 1785 len = strlen(dentry->d_name);
986 if (len >= sizeof(buf)) { 1786 if (len + pathlen + 1 >= sizeof(buf)) {
987 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path, 1787 warnf("Skipping '%s%s': len > sizeof(buf); %zu > %zu\n",
988 (unsigned long)len, (unsigned long)sizeof(buf)); 1788 path, dentry->d_name, len + pathlen + 1, sizeof(buf));
989 continue; 1789 continue;
990 } 1790 }
991 sprintf(buf, "%s/%s", path, dentry->d_name); 1791 memcpy(subpath, dentry->d_name, len);
992 if (lstat(buf, &st) != -1) { 1792 subpath[len] = '\0';
1793
993 if (S_ISREG(st.st_mode)) 1794 if (S_ISREG(st.st_mode))
994 scanelf_file(buf); 1795 ret = scanelf_fileat(dir_fd, buf, &st);
995 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1796 else if (dir_recurse && S_ISDIR(st.st_mode)) {
996 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1797 if (dir_crossmount || (st_top.st_dev == st.st_dev))
997 scanelf_dir(buf); 1798 ret = scanelf_dirat(dir_fd, buf);
998 }
999 } 1799 }
1000 } 1800 }
1001 closedir(dir); 1801 closedir(dir);
1002}
1003 1802
1803 return ret;
1804}
1805static int scanelf_dir(const char *path)
1806{
1807 return scanelf_dirat(root_fd, root_rel_path(path));
1808}
1809
1004static int scanelf_from_file(char *filename) 1810static int scanelf_from_file(const char *filename)
1005{ 1811{
1006 FILE *fp = NULL; 1812 FILE *fp;
1007 char *p; 1813 char *p, *path;
1008 char path[_POSIX_PATH_MAX]; 1814 size_t len;
1815 int ret;
1009 1816
1010 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL)) 1817 if (strcmp(filename, "-") == 0)
1011 fp = stdin; 1818 fp = stdin;
1012 else if ((fp = fopen(filename, "r")) == NULL) 1819 else if ((fp = fopen(filename, "r")) == NULL)
1013 return 1; 1820 return 1;
1014 1821
1015 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1822 path = NULL;
1823 len = 0;
1824 ret = 0;
1825 while (getline(&path, &len, fp) != -1) {
1016 if ((p = strchr(path, '\n')) != NULL) 1826 if ((p = strchr(path, '\n')) != NULL)
1017 *p = 0; 1827 *p = 0;
1018 search_path = path; 1828 search_path = path;
1019 scanelf_dir(path); 1829 ret = scanelf_dir(path);
1020 } 1830 }
1831 free(path);
1832
1021 if (fp != stdin) 1833 if (fp != stdin)
1022 fclose(fp); 1834 fclose(fp);
1835
1023 return 0; 1836 return ret;
1024} 1837}
1025 1838
1026static void load_ld_so_conf() 1839#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1840
1841static int _load_ld_cache_config(const char *fname)
1027{ 1842{
1028 FILE *fp = NULL; 1843 FILE *fp = NULL;
1029 char *p; 1844 char *p, *path;
1030 char path[_POSIX_PATH_MAX]; 1845 size_t len;
1031 int i = 0; 1846 int curr_fd = -1;
1032 1847
1033 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1848 fp = fopenat_r(root_fd, root_rel_path(fname));
1849 if (fp == NULL)
1034 return; 1850 return -1;
1035 1851
1036 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1852 path = NULL;
1037 if (*path != '/') 1853 len = 0;
1038 continue; 1854 while (getline(&path, &len, fp) != -1) {
1039
1040 if ((p = strrchr(path, '\r')) != NULL) 1855 if ((p = strrchr(path, '\r')) != NULL)
1041 *p = 0; 1856 *p = 0;
1042 if ((p = strchr(path, '\n')) != NULL) 1857 if ((p = strchr(path, '\n')) != NULL)
1043 *p = 0; 1858 *p = 0;
1044 1859
1045 ldpaths[i++] = xstrdup(path); 1860 /* recursive includes of the same file will make this segfault. */
1861 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1862 glob_t gl;
1863 size_t x;
1864 const char *gpath;
1046 1865
1047 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths)) 1866 /* re-use existing path buffer ... need to be creative */
1048 break; 1867 if (path[8] != '/')
1868 gpath = memcpy(path + 3, "/etc/", 5);
1869 else
1870 gpath = path + 8;
1871 if (root_fd != AT_FDCWD) {
1872 if (curr_fd == -1) {
1873 curr_fd = open(".", O_RDONLY|O_CLOEXEC);
1874 if (fchdir(root_fd))
1875 errp("unable to change to root dir");
1876 }
1877 gpath = root_rel_path(gpath);
1878 }
1879
1880 if (glob(gpath, 0, NULL, &gl) == 0) {
1881 for (x = 0; x < gl.gl_pathc; ++x) {
1882 /* try to avoid direct loops */
1883 if (strcmp(gl.gl_pathv[x], fname) == 0)
1884 continue;
1885 _load_ld_cache_config(gl.gl_pathv[x]);
1886 }
1887 globfree(&gl);
1888 }
1889
1890 /* failed globs are ignored by glibc */
1891 continue;
1049 } 1892 }
1050 ldpaths[i] = NULL; 1893
1894 if (*path != '/')
1895 continue;
1896
1897 xarraypush_str(ldpaths, path);
1898 }
1899 free(path);
1051 1900
1052 fclose(fp); 1901 fclose(fp);
1902
1903 if (curr_fd != -1) {
1904 if (fchdir(curr_fd))
1905 {/* don't care */}
1906 close(curr_fd);
1907 }
1908
1909 return 0;
1910}
1911
1912#elif defined(__FreeBSD__) || defined(__DragonFly__)
1913
1914static int _load_ld_cache_config(const char *fname)
1915{
1916 FILE *fp = NULL;
1917 char *b = NULL, *p;
1918 struct elfhints_hdr hdr;
1919
1920 fp = fopenat_r(root_fd, root_rel_path(fname));
1921 if (fp == NULL)
1922 return -1;
1923
1924 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1925 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1926 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1927 {
1928 fclose(fp);
1929 return -1;
1930 }
1931
1932 b = xmalloc(hdr.dirlistlen + 1);
1933 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1934 fclose(fp);
1935 free(b);
1936 return -1;
1937 }
1938
1939 while ((p = strsep(&b, ":"))) {
1940 if (*p == '\0')
1941 continue;
1942 xarraypush_str(ldpaths, p);
1943 }
1944
1945 free(b);
1946 fclose(fp);
1947 return 0;
1948}
1949
1950#else
1951#ifdef __ELF__
1952#warning Cache config support not implemented for your target
1953#endif
1954static int _load_ld_cache_config(const char *fname)
1955{
1956 return 0;
1957}
1958#endif
1959
1960static void load_ld_cache_config(const char *fname)
1961{
1962 bool scan_l, scan_ul, scan_ull;
1963 size_t n;
1964 const char *ldpath;
1965
1966 _load_ld_cache_config(fname);
1967
1968 scan_l = scan_ul = scan_ull = false;
1969 array_for_each(ldpaths, n, ldpath) {
1970 if (!scan_l && !strcmp(ldpath, "/lib")) scan_l = true;
1971 if (!scan_ul && !strcmp(ldpath, "/usr/lib")) scan_ul = true;
1972 if (!scan_ull && !strcmp(ldpath, "/usr/local/lib")) scan_ull = true;
1973 }
1974
1975 if (!scan_l) xarraypush_str(ldpaths, "/lib");
1976 if (!scan_ul) xarraypush_str(ldpaths, "/usr/lib");
1977 if (!scan_ull) xarraypush_str(ldpaths, "/usr/local/lib");
1053} 1978}
1054 1979
1055/* scan /etc/ld.so.conf for paths */ 1980/* scan /etc/ld.so.conf for paths */
1056static void scanelf_ldpath() 1981static void scanelf_ldpath(void)
1057{ 1982{
1058 char scan_l, scan_ul, scan_ull; 1983 size_t n;
1059 int i = 0; 1984 const char *ldpath;
1060 1985
1061 if (!ldpaths[0]) 1986 array_for_each(ldpaths, n, ldpath)
1062 err("Unable to load any paths from ld.so.conf");
1063
1064 scan_l = scan_ul = scan_ull = 0;
1065
1066 while (ldpaths[i]) {
1067 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
1068 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
1069 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
1070 scanelf_dir(ldpaths[i]); 1987 scanelf_dir(ldpath);
1071 ++i;
1072 }
1073
1074 if (!scan_l) scanelf_dir("/lib");
1075 if (!scan_ul) scanelf_dir("/usr/lib");
1076 if (!scan_ull) scanelf_dir("/usr/local/lib");
1077} 1988}
1078 1989
1079/* scan env PATH for paths */ 1990/* scan env PATH for paths */
1080static void scanelf_envpath() 1991static void scanelf_envpath(void)
1081{ 1992{
1082 char *path, *p; 1993 char *path, *p;
1083 1994
1084 path = getenv("PATH"); 1995 path = getenv("PATH");
1085 if (!path) 1996 if (!path)
1092 } 2003 }
1093 2004
1094 free(path); 2005 free(path);
1095} 2006}
1096 2007
1097 2008/* usage / invocation handling functions */ /* Free Flags: c d j u w G H J K P Q U W */
1098/* usage / invocation handling functions */
1099#define PARSE_FLAGS "plRmyxetrnLibSs:gN:TaqvF:f:o:BhV" 2009#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZCBhV"
1100#define a_argument required_argument 2010#define a_argument required_argument
1101static struct option const long_opts[] = { 2011static struct option const long_opts[] = {
1102 {"path", no_argument, NULL, 'p'}, 2012 {"path", no_argument, NULL, 'p'},
1103 {"ldpath", no_argument, NULL, 'l'}, 2013 {"ldpath", no_argument, NULL, 'l'},
2014 {"use-ldpath",no_argument, NULL, 129},
2015 {"root", a_argument, NULL, 128},
1104 {"recursive", no_argument, NULL, 'R'}, 2016 {"recursive", no_argument, NULL, 'R'},
1105 {"mount", no_argument, NULL, 'm'}, 2017 {"mount", no_argument, NULL, 'm'},
1106 {"symlink", no_argument, NULL, 'y'}, 2018 {"symlink", no_argument, NULL, 'y'},
2019 {"archives", no_argument, NULL, 'A'},
2020 {"ldcache", no_argument, NULL, 'L'},
2021 {"fix", no_argument, NULL, 'X'},
2022 {"setpax", a_argument, NULL, 'z'},
1107 {"pax", no_argument, NULL, 'x'}, 2023 {"pax", no_argument, NULL, 'x'},
1108 {"header", no_argument, NULL, 'e'}, 2024 {"header", no_argument, NULL, 'e'},
1109 {"textrel", no_argument, NULL, 't'}, 2025 {"textrel", no_argument, NULL, 't'},
1110 {"rpath", no_argument, NULL, 'r'}, 2026 {"rpath", no_argument, NULL, 'r'},
1111 {"needed", no_argument, NULL, 'n'}, 2027 {"needed", no_argument, NULL, 'n'},
1112 {"ldcache", no_argument, NULL, 'L'},
1113 {"interp", no_argument, NULL, 'i'}, 2028 {"interp", no_argument, NULL, 'i'},
1114 {"bind", no_argument, NULL, 'b'}, 2029 {"bind", no_argument, NULL, 'b'},
1115 {"soname", no_argument, NULL, 'S'}, 2030 {"soname", no_argument, NULL, 'S'},
1116 {"symbol", a_argument, NULL, 's'}, 2031 {"symbol", a_argument, NULL, 's'},
2032 {"section", a_argument, NULL, 'k'},
1117 {"lib", a_argument, NULL, 'N'}, 2033 {"lib", a_argument, NULL, 'N'},
1118 {"gmatch", no_argument, NULL, 'g'}, 2034 {"gmatch", no_argument, NULL, 'g'},
1119 {"textrels", no_argument, NULL, 'T'}, 2035 {"textrels", no_argument, NULL, 'T'},
2036 {"etype", a_argument, NULL, 'E'},
2037 {"bits", a_argument, NULL, 'M'},
2038 {"endian", no_argument, NULL, 'D'},
2039 {"osabi", no_argument, NULL, 'I'},
2040 {"eabi", no_argument, NULL, 'Y'},
2041 {"perms", a_argument, NULL, 'O'},
2042 {"size", no_argument, NULL, 'Z'},
1120 {"all", no_argument, NULL, 'a'}, 2043 {"all", no_argument, NULL, 'a'},
1121 {"quiet", no_argument, NULL, 'q'}, 2044 {"quiet", no_argument, NULL, 'q'},
1122 {"verbose", no_argument, NULL, 'v'}, 2045 {"verbose", no_argument, NULL, 'v'},
1123 {"format", a_argument, NULL, 'F'}, 2046 {"format", a_argument, NULL, 'F'},
1124 {"from", a_argument, NULL, 'f'}, 2047 {"from", a_argument, NULL, 'f'},
1125 {"file", a_argument, NULL, 'o'}, 2048 {"file", a_argument, NULL, 'o'},
2049 {"nocolor", no_argument, NULL, 'C'},
1126 {"nobanner", no_argument, NULL, 'B'}, 2050 {"nobanner", no_argument, NULL, 'B'},
1127 {"help", no_argument, NULL, 'h'}, 2051 {"help", no_argument, NULL, 'h'},
1128 {"version", no_argument, NULL, 'V'}, 2052 {"version", no_argument, NULL, 'V'},
1129 {NULL, no_argument, NULL, 0x0} 2053 {NULL, no_argument, NULL, 0x0}
1130}; 2054};
1131 2055
1132static const char *opts_help[] = { 2056static const char * const opts_help[] = {
1133 "Scan all directories in PATH environment", 2057 "Scan all directories in PATH environment",
1134 "Scan all directories in /etc/ld.so.conf", 2058 "Scan all directories in /etc/ld.so.conf",
2059 "Use ld.so.conf to show full path (use with -r/-n)",
2060 "Root directory (use with -l or -p)",
1135 "Scan directories recursively", 2061 "Scan directories recursively",
1136 "Don't recursively cross mount points", 2062 "Don't recursively cross mount points",
1137 "Don't scan symlinks\n", 2063 "Don't scan symlinks",
2064 "Scan archives (.a files)",
2065 "Utilize ld.so.cache to show full path (use with -r/-n)",
2066 "Try and 'fix' bad things (use with -r/-e)",
2067 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1138 "Print PaX markings", 2068 "Print PaX markings",
1139 "Print GNU_STACK/PT_LOAD markings", 2069 "Print GNU_STACK/PT_LOAD markings",
1140 "Print TEXTREL information", 2070 "Print TEXTREL information",
1141 "Print RPATH information", 2071 "Print RPATH information",
1142 "Print NEEDED information", 2072 "Print NEEDED information",
1143 "Resolve NEEDED information (use with -n)",
1144 "Print INTERP information", 2073 "Print INTERP information",
1145 "Print BIND information", 2074 "Print BIND information",
1146 "Print SONAME information", 2075 "Print SONAME information",
1147 "Find a specified symbol", 2076 "Find a specified symbol",
2077 "Find a specified section",
1148 "Find a specified library", 2078 "Find a specified library",
1149 "Use strncmp to match libraries. (use with -N)", 2079 "Use regex rather than string compare (with -s); specify twice for case insensitive",
1150 "Locate cause of TEXTREL", 2080 "Locate cause of TEXTREL",
1151 "Print all scanned info (-x -e -t -r -b)\n", 2081 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
2082 "Print only ELF files matching numeric bits",
2083 "Print Endianness",
2084 "Print OSABI",
2085 "Print EABI (EM_ARM Only)",
2086 "Print only ELF files matching octal permissions",
2087 "Print ELF file size",
2088 "Print all useful/simple info\n",
1152 "Only output 'bad' things", 2089 "Only output 'bad' things",
1153 "Be verbose (can be specified more than once)", 2090 "Be verbose (can be specified more than once)",
1154 "Use specified format for output", 2091 "Use specified format for output",
1155 "Read input stream from a filename", 2092 "Read input stream from a filename",
1156 "Write output stream to a filename", 2093 "Write output stream to a filename",
2094 "Don't emit color in output",
1157 "Don't display the header", 2095 "Don't display the header",
1158 "Print this help and exit", 2096 "Print this help and exit",
1159 "Print version and exit", 2097 "Print version and exit",
1160 NULL 2098 NULL
1161}; 2099};
1162 2100
1163/* display usage and exit */ 2101/* display usage and exit */
1164static void usage(int status) 2102static void usage(int status)
1165{ 2103{
1166 unsigned long i; 2104 const char a_arg[] = "<arg>";
2105 size_t a_arg_len = strlen(a_arg) + 2;
2106 size_t i;
2107 int optlen;
1167 printf("* Scan ELF binaries for stuff\n\n" 2108 printf("* Scan ELF binaries for stuff\n\n"
1168 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0); 2109 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1169 printf("Options: -[%s]\n", PARSE_FLAGS); 2110 printf("Options: -[%s]\n", PARSE_FLAGS);
2111
2112 /* prescan the --long opt length to auto-align */
2113 optlen = 0;
1170 for (i = 0; long_opts[i].name; ++i) 2114 for (i = 0; long_opts[i].name; ++i) {
2115 int l = strlen(long_opts[i].name);
2116 if (long_opts[i].has_arg == a_argument)
2117 l += a_arg_len;
2118 optlen = max(l, optlen);
2119 }
2120
2121 for (i = 0; long_opts[i].name; ++i) {
2122 /* first output the short flag if it has one */
2123 if (long_opts[i].val > '~')
2124 printf(" ");
2125 else
2126 printf(" -%c, ", long_opts[i].val);
2127
2128 /* then the long flag */
1171 if (long_opts[i].has_arg == no_argument) 2129 if (long_opts[i].has_arg == no_argument)
1172 printf(" -%c, --%-13s* %s\n", long_opts[i].val, 2130 printf("--%-*s", optlen, long_opts[i].name);
1173 long_opts[i].name, opts_help[i]);
1174 else 2131 else
1175 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val, 2132 printf("--%s %s %*s", long_opts[i].name, a_arg,
1176 long_opts[i].name, opts_help[i]); 2133 (int)(optlen - strlen(long_opts[i].name) - a_arg_len), "");
1177 2134
1178 if (status != EXIT_SUCCESS) 2135 /* finally the help text */
1179 exit(status); 2136 printf("* %s\n", opts_help[i]);
2137 }
1180 2138
1181 puts("\nThe format modifiers for the -F option are:"); 2139 puts("\nFor more information, see the scanelf(1) manpage");
1182 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1183 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1184 puts(" i INTERP \tb BIND \ts symbol");
1185 puts(" N library \to Type \tT TEXTRELs");
1186 puts(" S SONAME");
1187 puts(" p filename (with search path removed)");
1188 puts(" f filename (short name/basename)");
1189 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1190
1191 exit(status); 2140 exit(status);
1192} 2141}
1193 2142
1194/* parse command line arguments and preform needed actions */ 2143/* parse command line arguments and preform needed actions */
2144#define do_pax_state(option, flag) \
2145 if (islower(option)) { \
2146 flags &= ~PF_##flag; \
2147 flags |= PF_NO##flag; \
2148 } else { \
2149 flags &= ~PF_NO##flag; \
2150 flags |= PF_##flag; \
2151 }
2152static void parse_delimited(array_t *arr, char *arg, const char *delim)
2153{
2154 char *ele = strtok(arg, delim);
2155 if (!ele) /* edge case: -s '' */
2156 xarraypush_str(arr, "");
2157 while (ele) {
2158 xarraypush_str(arr, ele);
2159 ele = strtok(NULL, delim);
2160 }
2161}
1195static void parseargs(int argc, char *argv[]) 2162static int parseargs(int argc, char *argv[])
1196{ 2163{
1197 int i; 2164 int i;
1198 char *from_file = NULL; 2165 const char *from_file = NULL;
2166 int ret = 0;
2167 char load_cache_config = 0;
1199 2168
1200 opterr = 0; 2169 opterr = 0;
1201 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 2170 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1202 switch (i) { 2171 switch (i) {
1203 2172
1207 VERSION, __FILE__, __DATE__, rcsid, argv0); 2176 VERSION, __FILE__, __DATE__, rcsid, argv0);
1208 exit(EXIT_SUCCESS); 2177 exit(EXIT_SUCCESS);
1209 break; 2178 break;
1210 case 'h': usage(EXIT_SUCCESS); break; 2179 case 'h': usage(EXIT_SUCCESS); break;
1211 case 'f': 2180 case 'f':
1212 if (from_file) err("Don't specify -f twice"); 2181 if (from_file) warn("You prob don't want to specify -f twice");
1213 from_file = xstrdup(optarg); 2182 from_file = optarg;
2183 break;
2184 case 'E':
2185 /* historically, this was comma delimited */
2186 parse_delimited(match_etypes, optarg, ",");
2187 break;
2188 case 'M':
2189 match_bits = atoi(optarg);
2190 if (match_bits == 0) {
2191 if (strcmp(optarg, "ELFCLASS32") == 0)
2192 match_bits = 32;
2193 if (strcmp(optarg, "ELFCLASS64") == 0)
2194 match_bits = 64;
2195 }
2196 break;
2197 case 'O':
2198 if (sscanf(optarg, "%o", &match_perms) == -1)
2199 match_bits = 0;
1214 break; 2200 break;
1215 case 'o': { 2201 case 'o': {
1216 FILE *fp = NULL;
1217 if ((fp = freopen(optarg, "w", stdout)) == NULL) 2202 if (freopen(optarg, "w", stdout) == NULL)
1218 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 2203 errp("Could not freopen(%s)", optarg);
1219 SET_STDOUT(fp);
1220 break; 2204 break;
1221 } 2205 }
1222
1223 case 's': { 2206 case 'k':
1224 if (find_sym) warn("You prob don't want to specify -s twice"); 2207 xarraypush_str(find_section_arr, optarg);
1225 find_sym = optarg;
1226 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1227 sprintf(versioned_symname, "%s@", find_sym);
1228 break; 2208 break;
1229 }
1230 case 'N': { 2209 case 's':
1231 if (find_lib) warn("You prob don't want to specify -N twice"); 2210 /* historically, this was comma delimited */
1232 find_lib = optarg; 2211 parse_delimited(find_sym_arr, optarg, ",");
1233 break; 2212 break;
1234 } 2213 case 'N':
1235 2214 xarraypush_str(find_lib_arr, optarg);
2215 break;
1236 case 'F': { 2216 case 'F': {
1237 if (out_format) warn("You prob don't want to specify -F twice"); 2217 if (out_format) warn("You prob don't want to specify -F twice");
1238 out_format = optarg; 2218 out_format = optarg;
1239 break; 2219 break;
1240 } 2220 }
2221 case 'z': {
2222 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
2223 size_t x;
1241 2224
1242 case 'g': gmatch = 1; /* break; any reason we dont breal; here ? */ 2225 for (x = 0; x < strlen(optarg); x++) {
1243 case 'L': printcache = 1; break; 2226 switch (optarg[x]) {
2227 case 'p':
2228 case 'P':
2229 do_pax_state(optarg[x], PAGEEXEC);
2230 break;
2231 case 's':
2232 case 'S':
2233 do_pax_state(optarg[x], SEGMEXEC);
2234 break;
2235 case 'm':
2236 case 'M':
2237 do_pax_state(optarg[x], MPROTECT);
2238 break;
2239 case 'e':
2240 case 'E':
2241 do_pax_state(optarg[x], EMUTRAMP);
2242 break;
2243 case 'r':
2244 case 'R':
2245 do_pax_state(optarg[x], RANDMMAP);
2246 break;
2247 case 'x':
2248 case 'X':
2249 do_pax_state(optarg[x], RANDEXEC);
2250 break;
2251 default:
2252 break;
2253 }
2254 }
2255 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
2256 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
2257 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
2258 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
2259 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
2260 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
2261 setpax = flags;
2262 break;
2263 }
2264 case 'Z': show_size = 1; break;
2265 case 'g': ++g_match; break;
2266 case 'L': load_cache_config = use_ldcache = 1; break;
1244 case 'y': scan_symlink = 0; break; 2267 case 'y': scan_symlink = 0; break;
2268 case 'A': scan_archives = 1; break;
2269 case 'C': color_init(true); break;
1245 case 'B': show_banner = 0; break; 2270 case 'B': show_banner = 0; break;
1246 case 'l': scan_ldpath = 1; break; 2271 case 'l': load_cache_config = scan_ldpath = 1; break;
1247 case 'p': scan_envpath = 1; break; 2272 case 'p': scan_envpath = 1; break;
1248 case 'R': dir_recurse = 1; break; 2273 case 'R': dir_recurse = 1; break;
1249 case 'm': dir_crossmount = 0; break; 2274 case 'm': dir_crossmount = 0; break;
2275 case 'X': ++fix_elf; break;
1250 case 'x': show_pax = 1; break; 2276 case 'x': show_pax = 1; break;
1251 case 'e': show_phdr = 1; break; 2277 case 'e': show_phdr = 1; break;
1252 case 't': show_textrel = 1; break; 2278 case 't': show_textrel = 1; break;
1253 case 'r': show_rpath = 1; break; 2279 case 'r': show_rpath = 1; break;
1254 case 'n': show_needed = 1; break; 2280 case 'n': show_needed = 1; break;
1255 case 'i': show_interp = 1; break; 2281 case 'i': show_interp = 1; break;
1256 case 'b': show_bind = 1; break; 2282 case 'b': show_bind = 1; break;
1257 case 'S': show_soname = 1; break; 2283 case 'S': show_soname = 1; break;
1258 case 'T': show_textrels = 1; break; 2284 case 'T': show_textrels = 1; break;
1259 case 'q': be_quiet = 1; break; 2285 case 'q': be_quiet = min(be_quiet, 20) + 1; break;
1260 case 'v': be_verbose = (be_verbose % 20) + 1; break; 2286 case 'v': be_verbose = min(be_verbose, 20) + 1; break;
1261 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break; 2287 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
1262 2288 case 'D': show_endian = 1; break;
2289 case 'I': show_osabi = 1; break;
2290 case 'Y': show_eabi = 1; break;
2291 case 128:
2292 root_fd = open(optarg, O_RDONLY|O_CLOEXEC);
2293 if (root_fd == -1)
2294 err("Could not open root: %s", optarg);
2295 break;
2296 case 129: load_cache_config = use_ldpath = 1; break;
1263 case ':': 2297 case ':':
1264 err("Option missing parameter\n"); 2298 err("Option '%c' is missing parameter", optopt);
1265 case '?': 2299 case '?':
1266 err("Unknown option\n"); 2300 err("Unknown option '%c' or argument missing", optopt);
1267 default: 2301 default:
1268 err("Unhandled option '%c'", i); 2302 err("Unhandled option '%c'; please report this", i);
1269 } 2303 }
1270 } 2304 }
2305 if (show_textrels && be_verbose)
2306 objdump = which("objdump", "OBJDUMP");
2307 /* precompile all the regexes */
2308 if (g_match) {
2309 regex_t preg;
2310 const char *this_sym;
2311 size_t n;
2312 int flags = REG_EXTENDED | REG_NOSUB | (g_match > 1 ? REG_ICASE : 0);
1271 2313
2314 array_for_each(find_sym_arr, n, this_sym) {
2315 /* see scanelf_match_symname for logic info */
2316 switch (this_sym[0]) {
2317 case '%':
2318 while (*(this_sym++))
2319 if (*this_sym == '%') {
2320 ++this_sym;
2321 break;
2322 }
2323 break;
2324 case '+':
2325 case '-':
2326 ++this_sym;
2327 break;
2328 }
2329 if (*this_sym == '*')
2330 ++this_sym;
2331
2332 ret = regcomp(&preg, this_sym, flags);
2333 if (ret) {
2334 char err[256];
2335 regerror(ret, &preg, err, sizeof(err));
2336 err("regcomp of %s failed: %s", this_sym, err);
2337 }
2338 xarraypush(find_sym_regex_arr, &preg, sizeof(preg));
2339 }
2340 }
2341 /* flatten arrays for display */
2342 find_sym = array_flatten_str(find_sym_arr);
2343 find_lib = array_flatten_str(find_lib_arr);
2344 find_section = array_flatten_str(find_section_arr);
1272 /* let the format option override all other options */ 2345 /* let the format option override all other options */
1273 if (out_format) { 2346 if (out_format) {
1274 show_pax = show_phdr = show_textrel = show_rpath = \ 2347 show_pax = show_phdr = show_textrel = show_rpath = \
1275 show_needed = show_interp = show_bind = show_soname = \ 2348 show_needed = show_interp = show_bind = show_soname = \
1276 show_textrels = 0; 2349 show_textrels = show_perms = show_endian = show_size = \
2350 show_osabi = show_eabi = 0;
1277 for (i = 0; out_format[i]; ++i) { 2351 for (i = 0; out_format[i]; ++i) {
1278 if (!IS_MODIFIER(out_format[i])) continue; 2352 if (!IS_MODIFIER(out_format[i])) continue;
1279 2353
1280 switch (out_format[++i]) { 2354 switch (out_format[++i]) {
2355 case '+': break;
1281 case '%': break; 2356 case '%': break;
1282 case '#': break; 2357 case '#': break;
1283 case 'F': break; 2358 case 'F': break;
1284 case 'p': break; 2359 case 'p': break;
1285 case 'f': break; 2360 case 'f': break;
2361 case 'k': break;
1286 case 's': break; 2362 case 's': break;
1287 case 'N': break; 2363 case 'N': break;
1288 case 'o': break; 2364 case 'o': break;
2365 case 'a': break;
2366 case 'M': break;
2367 case 'Z': show_size = 1; break;
2368 case 'D': show_endian = 1; break;
2369 case 'I': show_osabi = 1; break;
2370 case 'Y': show_eabi = 1; break;
2371 case 'O': show_perms = 1; break;
1289 case 'x': show_pax = 1; break; 2372 case 'x': show_pax = 1; break;
1290 case 'e': show_phdr = 1; break; 2373 case 'e': show_phdr = 1; break;
1291 case 't': show_textrel = 1; break; 2374 case 't': show_textrel = 1; break;
1292 case 'r': show_rpath = 1; break; 2375 case 'r': show_rpath = 1; break;
1293 case 'n': show_needed = 1; break; 2376 case 'n': show_needed = 1; break;
1294 case 'i': show_interp = 1; break; 2377 case 'i': show_interp = 1; break;
1295 case 'b': show_bind = 1; break; 2378 case 'b': show_bind = 1; break;
1296 case 'S': show_soname = 1; break; 2379 case 'S': show_soname = 1; break;
1297 case 'T': show_textrels = 1; break; 2380 case 'T': show_textrels = 1; break;
1298 default: 2381 default:
1299 err("Invalid format specifier '%c' (byte %i)", 2382 err("invalid format specifier '%c' (byte %i)",
1300 out_format[i], i+1); 2383 out_format[i], i+1);
1301 } 2384 }
1302 } 2385 }
1303 2386
1304 /* construct our default format */ 2387 /* construct our default format */
1305 } else { 2388 } else {
1306 size_t fmt_len = 30; 2389 size_t fmt_len = 30;
1307 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 2390 out_format = xmalloc(sizeof(char) * fmt_len);
2391 *out_format = '\0';
1308 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 2392 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1309 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len); 2393 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
2394 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
2395 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
2396 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
2397 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
2398 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
1310 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len); 2399 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1311 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 2400 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1312 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 2401 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1313 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 2402 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1314 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 2403 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1315 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len); 2404 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1316 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len); 2405 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1317 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len); 2406 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1318 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len); 2407 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
2408 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1319 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len); 2409 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1320 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 2410 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1321 } 2411 }
1322 if (be_verbose > 2) printf("Format: %s\n", out_format); 2412 if (be_verbose > 2) printf("Format: %s\n", out_format);
1323 2413
1324 /* now lets actually do the scanning */ 2414 /* now lets actually do the scanning */
1325 if (scan_ldpath || (show_rpath && be_quiet)) 2415 if (load_cache_config)
1326 load_ld_so_conf(); 2416 load_ld_cache_config(__PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
1327 if (scan_ldpath) scanelf_ldpath(); 2417 if (scan_ldpath) scanelf_ldpath();
1328 if (scan_envpath) scanelf_envpath(); 2418 if (scan_envpath) scanelf_envpath();
2419 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
2420 from_file = "-";
1329 if (from_file) { 2421 if (from_file) {
1330 scanelf_from_file(from_file); 2422 scanelf_from_file(from_file);
1331 free(from_file);
1332 from_file = *argv; 2423 from_file = *argv;
1333 } 2424 }
1334 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file) 2425 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1335 err("Nothing to scan !?"); 2426 err("Nothing to scan !?");
1336 while (optind < argc) { 2427 while (optind < argc) {
1337 search_path = argv[optind++]; 2428 search_path = argv[optind++];
1338 scanelf_dir(search_path); 2429 ret = scanelf_dir(search_path);
1339 } 2430 }
1340 2431
2432#ifdef __PAX_UTILS_CLEANUP
1341 /* clean up */ 2433 /* clean up */
1342 if (versioned_symname) free(versioned_symname);
1343 for (i = 0; ldpaths[i]; ++i)
1344 free(ldpaths[i]); 2434 xarrayfree(ldpaths);
2435 xarrayfree(find_sym_arr);
2436 xarrayfree(find_lib_arr);
2437 xarrayfree(find_section_arr);
2438 free(find_sym);
2439 free(find_lib);
2440 free(find_section);
2441 {
2442 size_t n;
2443 regex_t *preg;
2444 array_for_each(find_sym_regex_arr, n, preg)
2445 regfree(preg);
2446 xarrayfree(find_sym_regex_arr);
2447 }
1345 2448
1346 if (ldcache != 0) 2449 if (ldcache != 0)
1347 munmap(ldcache, ldcache_size); 2450 munmap(ldcache, ldcache_size);
1348} 2451#endif
1349 2452
1350
1351
1352/* utility funcs */
1353static char *xstrdup(const char *s)
1354{
1355 char *ret = strdup(s);
1356 if (!ret) err("Could not strdup(): %s", strerror(errno));
1357 return ret; 2453 return ret;
1358} 2454}
1359static void *xmalloc(size_t size)
1360{
1361 void *ret = malloc(size);
1362 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1363 return ret;
1364}
1365static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
1366{
1367 size_t new_len;
1368 2455
1369 new_len = strlen(*dst) + strlen(src); 2456static char **get_split_env(const char *envvar)
1370 if (*curr_len <= new_len) {
1371 *curr_len = new_len + (*curr_len / 2);
1372 *dst = realloc(*dst, *curr_len);
1373 if (!*dst)
1374 err("could not realloc() %li bytes", (unsigned long)*curr_len);
1375 }
1376
1377 if (n)
1378 strncat(*dst, src, n);
1379 else
1380 strcat(*dst, src);
1381}
1382static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1383{ 2457{
1384 static char my_app[2]; 2458 const char *delims = " \t\n";
1385 my_app[0] = append; 2459 char **envvals = NULL;
1386 my_app[1] = '\0'; 2460 char *env, *s;
1387 xstrcat(dst, my_app, curr_len); 2461 int nentry;
1388}
1389 2462
2463 if ((env = getenv(envvar)) == NULL)
2464 return NULL;
1390 2465
2466 env = xstrdup(env);
2467 if (env == NULL)
2468 return NULL;
2469
2470 s = strtok(env, delims);
2471 if (s == NULL) {
2472 free(env);
2473 return NULL;
2474 }
2475
2476 nentry = 0;
2477 while (s != NULL) {
2478 ++nentry;
2479 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
2480 envvals[nentry-1] = s;
2481 s = strtok(NULL, delims);
2482 }
2483 envvals[nentry] = NULL;
2484
2485 /* don't want to free(env) as it contains the memory that backs
2486 * the envvals array of strings */
2487 return envvals;
2488}
2489
2490static void parseenv(void)
2491{
2492 color_init(false);
2493 qa_textrels = get_split_env("QA_TEXTRELS");
2494 qa_execstack = get_split_env("QA_EXECSTACK");
2495 qa_wx_load = get_split_env("QA_WX_LOAD");
2496}
2497
2498#ifdef __PAX_UTILS_CLEANUP
2499static void cleanup(void)
2500{
2501 free(out_format);
2502 free(qa_textrels);
2503 free(qa_execstack);
2504 free(qa_wx_load);
2505}
2506#endif
1391 2507
1392int main(int argc, char *argv[]) 2508int main(int argc, char *argv[])
1393{ 2509{
2510 int ret;
1394 if (argc < 2) 2511 if (argc < 2)
1395 usage(EXIT_FAILURE); 2512 usage(EXIT_FAILURE);
2513 parseenv();
1396 parseargs(argc, argv); 2514 ret = parseargs(argc, argv);
1397 fclose(stdout); 2515 fclose(stdout);
1398#ifdef __BOUNDS_CHECKING_ON 2516#ifdef __PAX_UTILS_CLEANUP
1399 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()"); 2517 cleanup();
2518 warn("The calls to add/delete heap should be off:\n"
2519 "\t- 1 due to the out_buffer not being freed in scanelf_fileat()\n"
2520 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
1400#endif 2521#endif
1401 return EXIT_SUCCESS; 2522 return ret;
1402} 2523}
2524
2525/* Match filename against entries in matchlist, return TRUE
2526 * if the file is listed */
2527static int file_matches_list(const char *filename, char **matchlist)
2528{
2529 char **file;
2530 char *match;
2531 char buf[__PAX_UTILS_PATH_MAX];
2532
2533 if (matchlist == NULL)
2534 return 0;
2535
2536 for (file = matchlist; *file != NULL; file++) {
2537 if (search_path) {
2538 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2539 match = buf;
2540 } else {
2541 match = *file;
2542 }
2543 if (fnmatch(match, filename, 0) == 0)
2544 return 1;
2545 }
2546 return 0;
2547}

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