/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.82 Revision 1.239
1/* 1/*
2 * Copyright 2003-2005 Gentoo Foundation 2 * Copyright 2003-2007 Gentoo Foundation
3 * Distributed under the terms of the GNU General Public License v2 3 * Distributed under the terms of the GNU General Public License v2
4 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.82 2005/06/19 05:39:31 vapier Exp $ 4 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.239 2012/01/23 22:28:17 vapier Exp $
5 * 5 *
6 ******************************************************************** 6 * Copyright 2003-2007 Ned Ludd - <solar@gentoo.org>
7 * This program is free software; you can redistribute it and/or 7 * Copyright 2004-2007 Mike Frysinger - <vapier@gentoo.org>
8 * modify it under the terms of the GNU General Public License as
9 * published by the Free Software Foundation; either version 2 of the
10 * License, or (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
20 * MA 02111-1307, USA.
21 */ 8 */
22 9
23#include <stdio.h> 10static const char rcsid[] = "$Id: scanelf.c,v 1.239 2012/01/23 22:28:17 vapier Exp $";
24#include <stdlib.h> 11const char argv0[] = "scanelf";
25#include <sys/types.h> 12
26#include <libgen.h>
27#include <limits.h>
28#define __USE_GNU
29#include <string.h>
30#include <errno.h>
31#include <unistd.h>
32#include <sys/stat.h>
33#include <dirent.h>
34#include <getopt.h>
35#include <assert.h>
36#include "paxelf.h" 13#include "paxinc.h"
37 14
38static const char *rcsid = "$Id: scanelf.c,v 1.82 2005/06/19 05:39:31 vapier Exp $";
39#define argv0 "scanelf"
40
41#define IS_MODIFIER(c) (c == '%' || c == '#') 15#define IS_MODIFIER(c) (c == '%' || c == '#' || c == '+')
42
43
44 16
45/* prototypes */ 17/* prototypes */
46static void scanelf_file(const char *filename); 18static int file_matches_list(const char *filename, char **matchlist);
47static void scanelf_dir(const char *path);
48static void scanelf_ldpath();
49static void scanelf_envpath();
50static void usage(int status);
51static void parseargs(int argc, char *argv[]);
52static char *xstrdup(const char *s);
53static void *xmalloc(size_t size);
54static void xstrcat(char **dst, const char *src, size_t *curr_len);
55static inline void xchrcat(char **dst, const char append, size_t *curr_len);
56 19
57/* variables to control behavior */ 20/* variables to control behavior */
58static char *ldpaths[256]; 21static char *match_etypes = NULL;
22static array_t _ldpaths = array_init_decl, *ldpaths = &_ldpaths;
59static char scan_ldpath = 0; 23static char scan_ldpath = 0;
60static char scan_envpath = 0; 24static char scan_envpath = 0;
61static char scan_symlink = 1; 25static char scan_symlink = 1;
26static char scan_archives = 0;
62static char dir_recurse = 0; 27static char dir_recurse = 0;
63static char dir_crossmount = 1; 28static char dir_crossmount = 1;
64static char show_pax = 0; 29static char show_pax = 0;
30static char show_perms = 0;
31static char show_size = 0;
65static char show_phdr = 0; 32static char show_phdr = 0;
66static char show_textrel = 0; 33static char show_textrel = 0;
67static char show_rpath = 0; 34static char show_rpath = 0;
68static char show_needed = 0; 35static char show_needed = 0;
69static char show_interp = 0; 36static char show_interp = 0;
70static char show_bind = 0; 37static char show_bind = 0;
38static char show_soname = 0;
71static char show_textrels = 0; 39static char show_textrels = 0;
72static char show_banner = 1; 40static char show_banner = 1;
41static char show_endian = 0;
42static char show_osabi = 0;
43static char show_eabi = 0;
73static char be_quiet = 0; 44static char be_quiet = 0;
74static char be_verbose = 0; 45static char be_verbose = 0;
75static char be_wewy_wewy_quiet = 0; 46static char be_wewy_wewy_quiet = 0;
76static char *find_sym = NULL, *versioned_symname = NULL; 47static char be_semi_verbose = 0;
48static char *find_sym = NULL;
77static char *find_lib = NULL; 49static char *find_lib = NULL;
50static array_t _find_lib_arr = array_init_decl, *find_lib_arr = &_find_lib_arr;
51static char *find_section = NULL;
52static array_t _find_section_arr = array_init_decl, *find_section_arr = &_find_section_arr;
78static char *out_format = NULL; 53static char *out_format = NULL;
79static char *search_path = NULL; 54static char *search_path = NULL;
55static char fix_elf = 0;
56static char g_match = 0;
57static char use_ldcache = 0;
80 58
59static char **qa_textrels = NULL;
60static char **qa_execstack = NULL;
61static char **qa_wx_load = NULL;
62static int root_fd = AT_FDCWD;
81 63
64static int match_bits = 0;
65static unsigned int match_perms = 0;
66static void *ldcache = NULL;
67static size_t ldcache_size = 0;
68static unsigned long setpax = 0UL;
82 69
70static int has_objdump = 0;
71
72/* find the path to a file by name */
73static int bin_in_path(const char *fname)
74{
75 char fullpath[__PAX_UTILS_PATH_MAX];
76 char *path, *p;
77
78 path = getenv("PATH");
79 if (!path)
80 return 0;
81
82 while ((p = strrchr(path, ':')) != NULL) {
83 snprintf(fullpath, sizeof(fullpath), "%s/%s", p + 1, fname);
84 *p = 0;
85 if (access(fullpath, R_OK) != -1)
86 return 1;
87 }
88
89 return 0;
90}
91
92static FILE *fopenat_r(int dir_fd, const char *path)
93{
94 int fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
95 if (fd == -1)
96 return NULL;
97 return fdopen(fd, "re");
98}
99
100static const char *root_rel_path(const char *path)
101{
102 /*
103 * openat() will ignore the dirfd if path starts with
104 * a /, so consume all of that noise
105 *
106 * XXX: we don't handle relative paths like ../ that
107 * break out of the --root option, but for now, just
108 * don't do that :P.
109 */
110 if (root_fd != AT_FDCWD) {
111 while (*path == '/')
112 ++path;
113 if (*path == '\0')
114 path = ".";
115 }
116
117 return path;
118}
119
120/* 1 on failure. 0 otherwise */
121static int rematch(const char *regex, const char *match, int cflags)
122{
123 regex_t preg;
124 int ret;
125
126 if ((match == NULL) || (regex == NULL))
127 return EXIT_FAILURE;
128
129 if ((ret = regcomp(&preg, regex, cflags))) {
130 char err[256];
131
132 if (regerror(ret, &preg, err, sizeof(err)))
133 fprintf(stderr, "regcomp failed: %s", err);
134 else
135 fprintf(stderr, "regcomp failed");
136
137 return EXIT_FAILURE;
138 }
139 ret = regexec(&preg, match, 0, NULL, 0);
140 regfree(&preg);
141
142 return ret;
143}
144
83/* sub-funcs for scanelf_file() */ 145/* sub-funcs for scanelf_fileat() */
84static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab) 146static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **str)
85{ 147{
86 /* find the best SHT_DYNSYM and SHT_STRTAB sections */ 148 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
149
150 /* debug sections */
151 void *symtab = elf_findsecbyname(elf, ".symtab");
152 void *strtab = elf_findsecbyname(elf, ".strtab");
153 /* runtime sections */
154 void *dynsym = elf_findsecbyname(elf, ".dynsym");
155 void *dynstr = elf_findsecbyname(elf, ".dynstr");
156
87#define GET_SYMTABS(B) \ 157#define GET_SYMTABS(B) \
88 if (elf->elf_class == ELFCLASS ## B) { \ 158 if (elf->elf_class == ELFCLASS ## B) { \
89 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
90 /* debug sections */ \
91 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
92 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
93 /* runtime sections */ \
94 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
95 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
96 if (symtab && dynsym) { \ 159 if (symtab && dynsym) { \
160 Elf ## B ## _Shdr *esymtab = symtab; \
161 Elf ## B ## _Shdr *edynsym = dynsym; \
97 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \ 162 *sym = (EGET(esymtab->sh_size) > EGET(edynsym->sh_size)) ? symtab : dynsym; \
98 } else { \ 163 } else \
99 *sym = (void*)(symtab ? symtab : dynsym); \ 164 *sym = symtab ? symtab : dynsym; \
100 } \
101 if (strtab && dynstr) { \ 165 if (strtab && dynstr) { \
166 Elf ## B ## _Shdr *estrtab = strtab; \
167 Elf ## B ## _Shdr *edynstr = dynstr; \
102 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \ 168 *str = (EGET(estrtab->sh_size) > EGET(edynstr->sh_size)) ? strtab : dynstr; \
103 } else { \ 169 } else \
104 *tab = (void*)(strtab ? strtab : dynstr); \ 170 *str = strtab ? strtab : dynstr; \
105 } \
106 } 171 }
107 GET_SYMTABS(32) 172 GET_SYMTABS(32)
108 GET_SYMTABS(64) 173 GET_SYMTABS(64)
174
175 if (*sym && *str)
176 return;
177
178 /*
179 * damn, they're really going to make us work for it huh?
180 * reconstruct the section header info out of the dynamic
181 * tags so we can see what symbols this guy uses at runtime.
182 */
183#define GET_SYMTABS_DT(B) \
184 if (elf->elf_class == ELFCLASS ## B) { \
185 size_t i; \
186 static Elf ## B ## _Shdr sym_shdr, str_shdr; \
187 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
188 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
189 Elf ## B ## _Addr vsym, vstr, vhash, vgnu_hash; \
190 Elf ## B ## _Dyn *dyn; \
191 Elf ## B ## _Off offset; \
192 \
193 /* lookup symbols used at runtime with DT_SYMTAB / DT_STRTAB */ \
194 vsym = vstr = vhash = vgnu_hash = 0; \
195 memset(&sym_shdr, 0, sizeof(sym_shdr)); \
196 memset(&str_shdr, 0, sizeof(str_shdr)); \
197 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
198 if (EGET(phdr[i].p_type) != PT_DYNAMIC) \
199 continue; \
200 \
201 offset = EGET(phdr[i].p_offset); \
202 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
203 continue; \
204 \
205 dyn = DYN ## B (elf->vdata + offset); \
206 while (EGET(dyn->d_tag) != DT_NULL) { \
207 switch (EGET(dyn->d_tag)) { \
208 case DT_SYMTAB: vsym = EGET(dyn->d_un.d_val); break; \
209 case DT_SYMENT: sym_shdr.sh_entsize = dyn->d_un.d_val; break; \
210 case DT_STRTAB: vstr = EGET(dyn->d_un.d_val); break; \
211 case DT_STRSZ: str_shdr.sh_size = dyn->d_un.d_val; break; \
212 case DT_HASH: vhash = EGET(dyn->d_un.d_val); break; \
213 /*case DT_GNU_HASH: vgnu_hash = EGET(dyn->d_un.d_val); break;*/ \
214 } \
215 ++dyn; \
216 } \
217 if (vsym && vstr) \
218 break; \
219 } \
220 if (!vsym || !vstr || !(vhash || vgnu_hash)) \
221 return; \
222 \
223 /* calc offset into the ELF by finding the load addr of the syms */ \
224 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
225 Elf ## B ## _Addr vaddr = EGET(phdr[i].p_vaddr); \
226 Elf ## B ## _Addr filesz = EGET(phdr[i].p_filesz); \
227 offset = EGET(phdr[i].p_offset); \
228 \
229 if (EGET(phdr[i].p_type) != PT_LOAD) \
230 continue; \
231 \
232 if (vhash >= vaddr && vhash < vaddr + filesz) { \
233 /* Scan the hash table to see how many entries we have */ \
234 Elf32_Word max_sym_idx = 0; \
235 Elf32_Word *hashtbl = elf->vdata + offset + (vhash - vaddr); \
236 Elf32_Word b, nbuckets = EGET(hashtbl[0]); \
237 Elf32_Word nchains = EGET(hashtbl[1]); \
238 Elf32_Word *buckets = &hashtbl[2]; \
239 Elf32_Word *chains = &buckets[nbuckets]; \
240 Elf32_Word sym_idx; \
241 \
242 for (b = 0; b < nbuckets; ++b) { \
243 if (!buckets[b]) \
244 continue; \
245 for (sym_idx = buckets[b]; sym_idx < nchains && sym_idx; sym_idx = chains[sym_idx]) \
246 if (max_sym_idx < sym_idx) \
247 max_sym_idx = sym_idx; \
248 } \
249 ESET(sym_shdr.sh_size, sym_shdr.sh_entsize * max_sym_idx); \
250 } \
251 \
252 if (vsym >= vaddr && vsym < vaddr + filesz) { \
253 ESET(sym_shdr.sh_offset, offset + (vsym - vaddr)); \
254 *sym = &sym_shdr; \
255 } \
256 \
257 if (vstr >= vaddr && vstr < vaddr + filesz) { \
258 ESET(str_shdr.sh_offset, offset + (vstr - vaddr)); \
259 *str = &str_shdr; \
260 } \
261 } \
262 }
263 GET_SYMTABS_DT(32)
264 GET_SYMTABS_DT(64)
109} 265}
266
110static char *scanelf_file_pax(elfobj *elf, char *found_pax) 267static char *scanelf_file_pax(elfobj *elf, char *found_pax)
111{ 268{
112 static char *paxflags;
113 static char ret[7]; 269 static char ret[7];
114 unsigned long i, shown; 270 unsigned long i, shown;
115 271
116 if (!show_pax) return NULL; 272 if (!show_pax) return NULL;
117 273
124 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 280 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
125 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 281 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
126 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 282 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
127 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \ 283 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
128 continue; \ 284 continue; \
129 if (be_quiet && (EGET(phdr[i].p_flags) == 10240)) \ 285 if (fix_elf && setpax) { \
286 /* set the paxctl flags */ \
287 ESET(phdr[i].p_flags, setpax); \
288 } \
289 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
130 continue; \ 290 continue; \
131 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \ 291 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
132 *found_pax = 1; \ 292 *found_pax = 1; \
133 ++shown; \ 293 ++shown; \
134 break; \ 294 break; \
136 } 296 }
137 SHOW_PAX(32) 297 SHOW_PAX(32)
138 SHOW_PAX(64) 298 SHOW_PAX(64)
139 } 299 }
140 300
301 if (fix_elf && setpax) {
302 /* set the chpax settings */
303 if (elf->elf_class == ELFCLASS32) {
304 if (EHDR32(elf->ehdr)->e_type == ET_DYN || EHDR32(elf->ehdr)->e_type == ET_EXEC)
305 ESET(EHDR32(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
306 } else {
307 if (EHDR64(elf->ehdr)->e_type == ET_DYN || EHDR64(elf->ehdr)->e_type == ET_EXEC)
308 ESET(EHDR64(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
309 }
310 }
311
141 /* fall back to EI_PAX if no PT_PAX was found */ 312 /* fall back to EI_PAX if no PT_PAX was found */
142 if (!*ret) { 313 if (!*ret) {
314 static char *paxflags;
143 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf)); 315 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
144 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) { 316 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
145 *found_pax = 1; 317 *found_pax = 1;
146 return paxflags; 318 return (be_wewy_wewy_quiet ? NULL : paxflags);
147 } 319 }
148 strncpy(ret, paxflags, sizeof(ret)); 320 strncpy(ret, paxflags, sizeof(ret));
149 } 321 }
150 322
151 if (be_quiet && !shown) 323 if (be_wewy_wewy_quiet || (be_quiet && !shown))
152 return NULL; 324 return NULL;
325 else
153 return ret; 326 return ret;
154
155} 327}
328
156static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load) 329static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
157{ 330{
158 static char ret[12]; 331 static char ret[12];
159 char *found; 332 char *found;
160 unsigned long i, off, shown, check_flags;
161 unsigned char multi_stack, multi_relro, multi_load; 333 unsigned long i, shown, multi_stack, multi_relro, multi_load;
334 int max_pt_load;
162 335
163 if (!show_phdr) return NULL; 336 if (!show_phdr) return NULL;
164 337
165 memcpy(ret, "--- --- ---\0", 12); 338 memcpy(ret, "--- --- ---\0", 12);
166 339
167 shown = 0; 340 shown = 0;
168 multi_stack = multi_relro = multi_load = 0; 341 multi_stack = multi_relro = multi_load = 0;
342 max_pt_load = elf_max_pt_load(elf);
169 343
170 if (elf->phdr) { 344#define NOTE_GNU_STACK ".note.GNU-stack"
171#define SHOW_PHDR(B) \ 345#define SHOW_PHDR(B) \
172 if (elf->elf_class == ELFCLASS ## B) { \ 346 if (elf->elf_class == ELFCLASS ## B) { \
173 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 347 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
348 Elf ## B ## _Off offset; \
349 uint32_t flags, check_flags; \
350 if (elf->phdr != NULL) { \
174 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 351 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
175 uint32_t flags; \
176 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 352 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
177 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \ 353 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
354 if (multi_stack++) \
178 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \ 355 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
356 if (file_matches_list(elf->filename, qa_execstack)) \
357 continue; \
179 found = found_phdr; \ 358 found = found_phdr; \
180 off = 0; \ 359 offset = 0; \
181 check_flags = PF_X; \ 360 check_flags = PF_X; \
182 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \ 361 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
362 if (multi_relro++) \
183 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \ 363 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
184 found = found_relro; \ 364 found = found_relro; \
185 off = 4; \ 365 offset = 4; \
186 check_flags = PF_X; \ 366 check_flags = PF_X; \
187 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \ 367 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
188 if (multi_load++ > 2) warnf("%s: more than 2 PT_LOAD's !?", elf->filename); \ 368 if (EGET(ehdr->e_type) == ET_DYN || EGET(ehdr->e_type) == ET_EXEC) \
369 if (multi_load++ > max_pt_load) \
370 warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
371 if (file_matches_list(elf->filename, qa_wx_load)) \
372 continue; \
189 found = found_load; \ 373 found = found_load; \
190 off = 8; \ 374 offset = 8; \
191 check_flags = PF_W|PF_X; \ 375 check_flags = PF_W|PF_X; \
192 } else \ 376 } else \
193 continue; \ 377 continue; \
194 flags = EGET(phdr[i].p_flags); \ 378 flags = EGET(phdr[i].p_flags); \
195 if (be_quiet && ((flags & check_flags) != check_flags)) \ 379 if (be_quiet && ((flags & check_flags) != check_flags)) \
196 continue; \ 380 continue; \
381 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
382 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
383 ret[3] = ret[7] = '!'; \
384 flags = EGET(phdr[i].p_flags); \
385 } \
197 memcpy(ret+off, gnu_short_stack_flags(flags), 3); \ 386 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
198 *found = 1; \ 387 *found = 1; \
199 ++shown; \ 388 ++shown; \
389 } \
390 } else if (elf->shdr != NULL) { \
391 /* no program headers which means this is prob an object file */ \
392 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
393 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
394 char *str; \
395 if ((void*)strtbl > elf->data_end) \
396 goto skip_this_shdr##B; \
397 check_flags = SHF_WRITE|SHF_EXECINSTR; \
398 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
399 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
400 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
401 str = elf->data + offset; \
402 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
403 if (!strcmp(str, NOTE_GNU_STACK)) { \
404 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
405 flags = EGET(shdr[i].sh_flags); \
406 if (be_quiet && ((flags & check_flags) != check_flags)) \
407 continue; \
408 ++*found_phdr; \
409 shown = 1; \
410 if (flags & SHF_WRITE) ret[0] = 'W'; \
411 if (flags & SHF_ALLOC) ret[1] = 'A'; \
412 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
413 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
414 break; \
415 } \
416 } \
417 skip_this_shdr##B: \
418 if (!multi_stack) { \
419 if (file_matches_list(elf->filename, qa_execstack)) \
420 return NULL; \
421 *found_phdr = 1; \
422 shown = 1; \
423 memcpy(ret, "!WX", 3); \
424 } \
200 } \ 425 } \
201 } 426 }
202 SHOW_PHDR(32) 427 SHOW_PHDR(32)
203 SHOW_PHDR(64) 428 SHOW_PHDR(64)
204 }
205 429
206 if (be_quiet && !shown) 430 if (be_wewy_wewy_quiet || (be_quiet && !shown))
207 return NULL; 431 return NULL;
208 else 432 else
209 return ret; 433 return ret;
210} 434}
435
436/*
437 * See if this ELF contains a DT_TEXTREL tag in any of its
438 * PT_DYNAMIC sections.
439 */
211static char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 440static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
212{ 441{
213 static char ret[] = "TEXTREL"; 442 static const char *ret = "TEXTREL";
214 unsigned long i; 443 unsigned long i;
215 444
216 if (!show_textrel && !show_textrels) return NULL; 445 if (!show_textrel && !show_textrels) return NULL;
446
447 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
217 448
218 if (elf->phdr) { 449 if (elf->phdr) {
219#define SHOW_TEXTREL(B) \ 450#define SHOW_TEXTREL(B) \
220 if (elf->elf_class == ELFCLASS ## B) { \ 451 if (elf->elf_class == ELFCLASS ## B) { \
221 Elf ## B ## _Dyn *dyn; \ 452 Elf ## B ## _Dyn *dyn; \
222 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 453 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
223 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 454 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
224 Elf ## B ## _Off offset; \ 455 Elf ## B ## _Off offset; \
225 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 456 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
226 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 457 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
227 offset = EGET(phdr[i].p_offset); \ 458 offset = EGET(phdr[i].p_offset); \
228 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 459 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
229 dyn = DYN ## B (elf->data + offset); \ 460 dyn = DYN ## B (elf->vdata + offset); \
230 while (EGET(dyn->d_tag) != DT_NULL) { \ 461 while (EGET(dyn->d_tag) != DT_NULL) { \
231 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \ 462 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
232 *found_textrel = 1; \ 463 *found_textrel = 1; \
233 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \ 464 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
234 return (be_wewy_wewy_quiet ? NULL : ret); \ 465 return (be_wewy_wewy_quiet ? NULL : ret); \
241 } 472 }
242 473
243 if (be_quiet || be_wewy_wewy_quiet) 474 if (be_quiet || be_wewy_wewy_quiet)
244 return NULL; 475 return NULL;
245 else 476 else
246 return (char *)" - "; 477 return " - ";
247} 478}
479
480/*
481 * Scan the .text section to see if there are any relocations in it.
482 * Should rewrite this to check PT_LOAD sections that are marked
483 * Executable rather than the section named '.text'.
484 */
248static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel) 485static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
249{ 486{
250 unsigned long s, r, rmax; 487 unsigned long s, r, rmax;
251 void *symtab_void, *strtab_void, *text_void; 488 void *symtab_void, *strtab_void, *text_void;
252 489
273 Elf ## B ## _Rela *rela; \ 510 Elf ## B ## _Rela *rela; \
274 /* search the section headers for relocations */ \ 511 /* search the section headers for relocations */ \
275 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \ 512 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
276 uint32_t sh_type = EGET(shdr[s].sh_type); \ 513 uint32_t sh_type = EGET(shdr[s].sh_type); \
277 if (sh_type == SHT_REL) { \ 514 if (sh_type == SHT_REL) { \
278 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \ 515 rel = REL ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
279 rela = NULL; \ 516 rela = NULL; \
280 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \ 517 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
281 } else if (sh_type == SHT_RELA) { \ 518 } else if (sh_type == SHT_RELA) { \
282 rel = NULL; \ 519 rel = NULL; \
283 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \ 520 rela = RELA ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
284 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \ 521 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
285 } else \ 522 } else \
286 continue; \ 523 continue; \
287 /* now see if any of the relocs are in the .text */ \ 524 /* now see if any of the relocs are in the .text */ \
288 for (r = 0; r < rmax; ++r) { \ 525 for (r = 0; r < rmax; ++r) { \
303 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \ 540 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
304 if (be_verbose <= 2) continue; \ 541 if (be_verbose <= 2) continue; \
305 } else \ 542 } else \
306 *found_textrels = 1; \ 543 *found_textrels = 1; \
307 /* locate this relocation symbol name */ \ 544 /* locate this relocation symbol name */ \
308 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 545 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
546 if ((void*)sym > elf->data_end) { \
547 warn("%s: corrupt ELF symbol", elf->filename); \
548 continue; \
549 } \
309 sym_max = ELF ## B ## _R_SYM(r_info); \ 550 sym_max = ELF ## B ## _R_SYM(r_info); \
310 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \ 551 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
311 sym += sym_max; \ 552 sym += sym_max; \
312 else \ 553 else \
313 sym = NULL; \ 554 sym = NULL; \
314 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 555 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
315 /* show the raw details about this reloc */ \ 556 /* show the raw details about this reloc */ \
316 printf("\tTEXTREL %s: ", elf->base_filename); \ 557 printf(" %s: ", elf->base_filename); \
317 if (sym && sym->st_name) \ 558 if (sym && sym->st_name) \
318 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \ 559 printf("%s", elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
319 else \ 560 else \
320 printf("(NULL: fake?)"); \ 561 printf("(memory/data?)"); \
321 printf(" [0x%lX]", (unsigned long)r_offset); \ 562 printf(" [0x%lX]", (unsigned long)r_offset); \
322 /* now try to find the closest symbol that this rel is probably in */ \ 563 /* now try to find the closest symbol that this rel is probably in */ \
323 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 564 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
324 func = NULL; \ 565 func = NULL; \
325 offset_tmp = 0; \ 566 offset_tmp = 0; \
326 while (sym_max--) { \ 567 while (sym_max--) { \
327 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \ 568 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
328 func = sym; \ 569 func = sym; \
329 offset_tmp = EGET(sym->st_value); \ 570 offset_tmp = EGET(sym->st_value); \
330 } \ 571 } \
331 ++sym; \ 572 ++sym; \
332 } \ 573 } \
333 printf(" in "); \ 574 printf(" in "); \
334 if (func && func->st_name) \ 575 if (func && func->st_name) { \
335 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \ 576 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
577 if (r_offset > EGET(func->st_size)) \
578 printf("(optimized out: previous %s)", func_name); \
336 else \ 579 else \
337 printf("(NULL: fake?)"); \ 580 printf("%s", func_name); \
581 } else \
582 printf("(optimized out)"); \
338 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \ 583 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
584 if (be_verbose && has_objdump) { \
585 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
586 char *sysbuf; \
587 size_t syslen; \
588 const char sysfmt[] = "objdump -r -R -d -w -l --start-address=0x%lX --stop-address=0x%lX %s | grep --color -i -C 3 '.*[[:space:]]%lX:[[:space:]]*R_.*'\n"; \
589 syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
590 sysbuf = xmalloc(syslen); \
591 if (end_addr < r_offset) \
592 /* not uncommon when things are optimized out */ \
593 end_addr = r_offset + 0x100; \
594 snprintf(sysbuf, syslen, sysfmt, \
595 (unsigned long)offset_tmp, \
596 (unsigned long)end_addr, \
597 elf->filename, \
598 (unsigned long)r_offset); \
599 fflush(stdout); \
600 if (system(sysbuf)) /* don't care */; \
601 fflush(stdout); \
602 free(sysbuf); \
603 } \
339 } \ 604 } \
340 } } 605 } }
341 SHOW_TEXTRELS(32) 606 SHOW_TEXTRELS(32)
342 SHOW_TEXTRELS(64) 607 SHOW_TEXTRELS(64)
343 } 608 }
344 if (!*found_textrels) 609 if (!*found_textrels)
345 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename); 610 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
346 611
347 return NULL; 612 return NULL;
348} 613}
614
615static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
616{
617 struct stat st;
618 switch (*item) {
619 case '/': break;
620 case '.':
621 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
622 break;
623 case ':':
624 case '\0':
625 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
626 break;
627 case '$':
628 if (fstat(elf->fd, &st) != -1)
629 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
630 warnf("Security problem with %s='%s' in %s with mode set of %o",
631 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
632 break;
633 default:
634 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
635 break;
636 }
637}
349static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len) 638static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
350{ 639{
351 unsigned long i, s; 640 unsigned long i;
352 char *rpath, *runpath, **r; 641 char *rpath, *runpath, **r;
353 void *strtbl_void; 642 void *strtbl_void;
354 643
355 if (!show_rpath) return; 644 if (!show_rpath) return;
356 645
367 Elf ## B ## _Off offset; \ 656 Elf ## B ## _Off offset; \
368 Elf ## B ## _Xword word; \ 657 Elf ## B ## _Xword word; \
369 /* Scan all the program headers */ \ 658 /* Scan all the program headers */ \
370 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 659 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
371 /* Just scan dynamic headers */ \ 660 /* Just scan dynamic headers */ \
372 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 661 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
373 offset = EGET(phdr[i].p_offset); \ 662 offset = EGET(phdr[i].p_offset); \
374 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 663 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
375 /* Just scan dynamic RPATH/RUNPATH headers */ \ 664 /* Just scan dynamic RPATH/RUNPATH headers */ \
376 dyn = DYN ## B (elf->data + offset); \ 665 dyn = DYN ## B (elf->vdata + offset); \
377 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \ 666 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
378 if (word == DT_RPATH) { \ 667 if (word == DT_RPATH) { \
379 r = &rpath; \ 668 r = &rpath; \
380 } else if (word == DT_RUNPATH) { \ 669 } else if (word == DT_RUNPATH) { \
381 r = &runpath; \ 670 r = &runpath; \
385 } \ 674 } \
386 /* Verify the memory is somewhat sane */ \ 675 /* Verify the memory is somewhat sane */ \
387 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 676 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
388 if (offset < (Elf ## B ## _Off)elf->len) { \ 677 if (offset < (Elf ## B ## _Off)elf->len) { \
389 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \ 678 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
390 *r = (char*)(elf->data + offset); \ 679 *r = elf->data + offset; \
680 /* cache the length in case we need to nuke this section later on */ \
681 if (fix_elf) \
682 offset = strlen(*r); \
391 /* If quiet, don't output paths in ld.so.conf */ \ 683 /* If quiet, don't output paths in ld.so.conf */ \
392 if (be_quiet) { \ 684 if (be_quiet) { \
393 size_t len; \ 685 size_t len; \
394 char *start, *end; \ 686 char *start, *end; \
395 /* note that we only 'chop' off leading known paths. */ \ 687 /* note that we only 'chop' off leading known paths. */ \
396 /* since *r is read-only memory, we can only move the ptr forward. */ \ 688 /* since *r is read-only memory, we can only move the ptr forward. */ \
397 start = *r; \ 689 start = *r; \
398 /* scan each path in : delimited list */ \ 690 /* scan each path in : delimited list */ \
399 while (start) { \ 691 while (start) { \
692 rpath_security_checks(elf, start, get_elfdtype(word)); \
400 end = strchr(start, ':'); \ 693 end = strchr(start, ':'); \
401 len = (end ? abs(end - start) : strlen(start)); \ 694 len = (end ? abs(end - start) : strlen(start)); \
402 for (s = 0; ldpaths[s]; ++s) { \ 695 if (use_ldcache) { \
696 size_t n; \
697 const char *ldpath; \
698 array_for_each(ldpaths, n, ldpath) \
403 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \ 699 if (!strncmp(ldpath, start, len) && !ldpath[len]) { \
404 *r = (end ? end + 1 : NULL); \ 700 *r = end; \
701 /* corner case ... if RPATH reads "/usr/lib:", we want \
702 * to show ':' rather than '' */ \
703 if (end && end[1] != '\0') \
704 (*r)++; \
405 break; \ 705 break; \
406 } \ 706 } \
407 } \ 707 } \
408 if (!*r || !ldpaths[s] || !end) \ 708 if (!*r || !end) \
409 start = NULL; \ 709 break; \
410 else \ 710 else \
411 start = start + len + 1; \ 711 start = start + len + 1; \
412 } \ 712 } \
413 } \ 713 } \
714 if (*r) { \
715 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
716 /* just nuke it */ \
717 nuke_it##B: \
718 memset(*r, 0x00, offset); \
719 *r = NULL; \
720 ESET(dyn->d_tag, DT_DEBUG); \
721 ESET(dyn->d_un.d_ptr, 0); \
722 } else if (fix_elf) { \
723 /* try to clean "bad" paths */ \
724 size_t len, tmpdir_len; \
725 char *start, *end; \
726 const char *tmpdir; \
727 start = *r; \
728 tmpdir = (getenv("TMPDIR") ? : "."); \
729 tmpdir_len = strlen(tmpdir); \
730 while (1) { \
731 end = strchr(start, ':'); \
732 if (start == end) { \
733 eat_this_path##B: \
734 len = strlen(end); \
735 memmove(start, end+1, len); \
736 start[len-1] = '\0'; \
737 end = start - 1; \
738 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
739 if (!end) { \
740 if (start == *r) \
741 goto nuke_it##B; \
742 *--start = '\0'; \
743 } else \
744 goto eat_this_path##B; \
745 } \
746 if (!end) \
747 break; \
748 start = end + 1; \
749 } \
750 if (**r == '\0') \
751 goto nuke_it##B; \
752 } \
753 if (*r) \
414 if (*r) *found_rpath = 1; \ 754 *found_rpath = 1; \
755 } \
415 } \ 756 } \
416 ++dyn; \ 757 ++dyn; \
417 } \ 758 } \
418 } } 759 } }
419 SHOW_RPATH(32) 760 SHOW_RPATH(32)
436 } else if (rpath || runpath) 777 } else if (rpath || runpath)
437 xstrcat(ret, (runpath ? runpath : rpath), ret_len); 778 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
438 else if (!be_quiet) 779 else if (!be_quiet)
439 xstrcat(ret, " - ", ret_len); 780 xstrcat(ret, " - ", ret_len);
440} 781}
782
783#define LDSO_CACHE_MAGIC "ld.so-"
784#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
785#define LDSO_CACHE_VER "1.7.0"
786#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
787#define FLAG_ANY -1
788#define FLAG_TYPE_MASK 0x00ff
789#define FLAG_LIBC4 0x0000
790#define FLAG_ELF 0x0001
791#define FLAG_ELF_LIBC5 0x0002
792#define FLAG_ELF_LIBC6 0x0003
793#define FLAG_REQUIRED_MASK 0xff00
794#define FLAG_SPARC_LIB64 0x0100
795#define FLAG_IA64_LIB64 0x0200
796#define FLAG_X8664_LIB64 0x0300
797#define FLAG_S390_LIB64 0x0400
798#define FLAG_POWERPC_LIB64 0x0500
799#define FLAG_MIPS64_LIBN32 0x0600
800#define FLAG_MIPS64_LIBN64 0x0700
801
802#if defined(__GLIBC__) || defined(__UCLIBC__)
803
804static char *lookup_cache_lib(elfobj *elf, char *fname)
805{
806 int fd;
807 char *strs;
808 static char buf[__PAX_UTILS_PATH_MAX] = "";
809 const char *cachefile = root_rel_path("/etc/ld.so.cache");
810 struct stat st;
811
812 typedef struct {
813 char magic[LDSO_CACHE_MAGIC_LEN];
814 char version[LDSO_CACHE_VER_LEN];
815 int nlibs;
816 } header_t;
817 header_t *header;
818
819 typedef struct {
820 int flags;
821 int sooffset;
822 int liboffset;
823 } libentry_t;
824 libentry_t *libent;
825
826 if (fname == NULL)
827 return NULL;
828
829 if (ldcache == NULL) {
830 if (fstatat(root_fd, cachefile, &st, 0))
831 return NULL;
832
833 fd = openat(root_fd, cachefile, O_RDONLY);
834 if (fd == -1)
835 return NULL;
836
837 /* cache these values so we only map/unmap the cache file once */
838 ldcache_size = st.st_size;
839 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
840 close(fd);
841
842 if (ldcache == MAP_FAILED) {
843 ldcache = NULL;
844 return NULL;
845 }
846
847 if (memcmp(header->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN) ||
848 memcmp(header->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
849 {
850 munmap(ldcache, ldcache_size);
851 ldcache = NULL;
852 return NULL;
853 }
854 } else
855 header = ldcache;
856
857 libent = ldcache + sizeof(header_t);
858 strs = (char *) &libent[header->nlibs];
859
860 for (fd = 0; fd < header->nlibs; ++fd) {
861 /* This should be more fine grained, but for now we assume that
862 * diff arches will not be cached together, and we ignore the
863 * the different multilib mips cases.
864 */
865 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
866 continue;
867 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
868 continue;
869
870 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
871 continue;
872
873 /* Return first hit because that is how the ldso rolls */
874 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
875 break;
876 }
877
878 return buf;
879}
880
881#elif defined(__NetBSD__)
882static char *lookup_cache_lib(elfobj *elf, char *fname)
883{
884 static char buf[__PAX_UTILS_PATH_MAX] = "";
885 static struct stat st;
886 size_t n;
887 char *ldpath;
888
889 array_for_each(ldpath, n, ldpath) {
890 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", ldpath, fname) >= sizeof(buf))
891 continue; /* if the pathname is too long, or something went wrong, ignore */
892
893 if (stat(buf, &st) != 0)
894 continue; /* if the lib doesn't exist in *ldpath, look further */
895
896 /* NetBSD doesn't actually do sanity checks, it just loads the file
897 * and if that doesn't work, continues looking in other directories.
898 * This cannot easily be safely emulated, unfortunately. For now,
899 * just assume that if it exists, it's a valid library. */
900
901 return buf;
902 }
903
904 /* not found in any path */
905 return NULL;
906}
907#else
908#ifdef __ELF__
909#warning Cache support not implemented for your target
910#endif
911static char *lookup_cache_lib(elfobj *elf, char *fname)
912{
913 return NULL;
914}
915#endif
916
441static char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len) 917static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
442{ 918{
443 unsigned long i; 919 unsigned long i;
444 char *needed; 920 char *needed;
445 void *strtbl_void; 921 void *strtbl_void;
922 char *p;
446 923
924 /*
925 * -n -> op==0 -> print all
926 * -N -> op==1 -> print requested
927 */
447 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL; 928 if ((op == 0 && !show_needed) || (op == 1 && !find_lib))
929 return NULL;
448 930
449 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 931 strtbl_void = elf_findsecbyname(elf, ".dynstr");
450 932
451 if (elf->phdr && strtbl_void) { 933 if (elf->phdr && strtbl_void) {
452#define SHOW_NEEDED(B) \ 934#define SHOW_NEEDED(B) \
454 Elf ## B ## _Dyn *dyn; \ 936 Elf ## B ## _Dyn *dyn; \
455 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 937 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
456 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 938 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
457 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 939 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
458 Elf ## B ## _Off offset; \ 940 Elf ## B ## _Off offset; \
941 size_t matched = 0; \
942 /* Walk all the program headers to find the PT_DYNAMIC */ \
459 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 943 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
460 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 944 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) \
945 continue; \
461 offset = EGET(phdr[i].p_offset); \ 946 offset = EGET(phdr[i].p_offset); \
462 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 947 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
948 continue; \
949 /* Walk all the dynamic tags to find NEEDED entries */ \
463 dyn = DYN ## B (elf->data + offset); \ 950 dyn = DYN ## B (elf->vdata + offset); \
464 while (EGET(dyn->d_tag) != DT_NULL) { \ 951 while (EGET(dyn->d_tag) != DT_NULL) { \
465 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 952 if (EGET(dyn->d_tag) == DT_NEEDED) { \
466 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 953 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
467 if (offset >= (Elf ## B ## _Off)elf->len) { \ 954 if (offset >= (Elf ## B ## _Off)elf->len) { \
468 ++dyn; \ 955 ++dyn; \
469 continue; \ 956 continue; \
470 } \ 957 } \
471 needed = (char*)(elf->data + offset); \ 958 needed = elf->data + offset; \
472 if (op == 0) { \ 959 if (op == 0) { \
960 /* -n -> print all entries */ \
473 if (!be_wewy_wewy_quiet) { \ 961 if (!be_wewy_wewy_quiet) { \
474 if (*found_needed) xchrcat(ret, ',', ret_len); \ 962 if (*found_needed) xchrcat(ret, ',', ret_len); \
963 if (use_ldcache) \
964 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
965 needed = p; \
475 xstrcat(ret, needed, ret_len); \ 966 xstrcat(ret, needed, ret_len); \
476 } \ 967 } \
477 *found_needed = 1; \ 968 *found_needed = 1; \
478 } else { \ 969 } else { \
970 /* -N -> print matching entries */ \
971 size_t n; \
972 const char *find_lib_name; \
973 \
974 array_for_each(find_lib_arr, n, find_lib_name) { \
975 int invert = 1; \
976 if (find_lib_name[0] == '!') \
977 invert = 0, ++find_lib_name; \
479 if (!strcmp(find_lib, needed)) { \ 978 if (!strcmp(find_lib_name, needed) == invert) \
979 ++matched; \
980 } \
981 \
982 if (matched == array_cnt(find_lib_arr)) { \
480 *found_lib = 1; \ 983 *found_lib = 1; \
481 return (be_wewy_wewy_quiet ? NULL : find_lib); \ 984 return (be_wewy_wewy_quiet ? NULL : find_lib); \
482 } \ 985 } \
483 } \ 986 } \
484 } \ 987 } \
485 ++dyn; \ 988 ++dyn; \
486 } \ 989 } \
487 } } 990 } }
488 SHOW_NEEDED(32) 991 SHOW_NEEDED(32)
489 SHOW_NEEDED(64) 992 SHOW_NEEDED(64)
993 if (op == 0 && !*found_needed && be_verbose)
994 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
490 } 995 }
491 996
492 return NULL; 997 return NULL;
493} 998}
494static char *scanelf_file_interp(elfobj *elf, char *found_interp) 999static char *scanelf_file_interp(elfobj *elf, char *found_interp)
513} 1018}
514static char *scanelf_file_bind(elfobj *elf, char *found_bind) 1019static char *scanelf_file_bind(elfobj *elf, char *found_bind)
515{ 1020{
516 unsigned long i; 1021 unsigned long i;
517 struct stat s; 1022 struct stat s;
1023 char dynamic = 0;
518 1024
519 if (!show_bind) return NULL; 1025 if (!show_bind) return NULL;
520 if (!elf->phdr) return NULL; 1026 if (!elf->phdr) return NULL;
521 1027
522#define SHOW_BIND(B) \ 1028#define SHOW_BIND(B) \
524 Elf ## B ## _Dyn *dyn; \ 1030 Elf ## B ## _Dyn *dyn; \
525 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 1031 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
526 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 1032 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
527 Elf ## B ## _Off offset; \ 1033 Elf ## B ## _Off offset; \
528 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 1034 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
529 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 1035 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1036 dynamic = 1; \
530 offset = EGET(phdr[i].p_offset); \ 1037 offset = EGET(phdr[i].p_offset); \
531 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 1038 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
532 dyn = DYN ## B (elf->data + offset); \ 1039 dyn = DYN ## B (elf->vdata + offset); \
533 while (EGET(dyn->d_tag) != DT_NULL) { \ 1040 while (EGET(dyn->d_tag) != DT_NULL) { \
534 if (EGET(dyn->d_tag) == DT_BIND_NOW || \ 1041 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
535 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \ 1042 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
536 { \ 1043 { \
537 if (be_quiet) return NULL; \ 1044 if (be_quiet) return NULL; \
545 SHOW_BIND(32) 1052 SHOW_BIND(32)
546 SHOW_BIND(64) 1053 SHOW_BIND(64)
547 1054
548 if (be_wewy_wewy_quiet) return NULL; 1055 if (be_wewy_wewy_quiet) return NULL;
549 1056
1057 /* don't output anything if quiet mode and the ELF is static or not setuid */
550 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) { 1058 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
551 return NULL; 1059 return NULL;
552 } else { 1060 } else {
553 *found_bind = 1; 1061 *found_bind = 1;
554 return (char *) "LAZY"; 1062 return (char *)(dynamic ? "LAZY" : "STATIC");
555 } 1063 }
556} 1064}
557static char *scanelf_file_sym(elfobj *elf, char *found_sym) 1065static char *scanelf_file_soname(elfobj *elf, char *found_soname)
558{ 1066{
559 unsigned long i; 1067 unsigned long i;
1068 char *soname;
1069 void *strtbl_void;
1070
1071 if (!show_soname) return NULL;
1072
1073 strtbl_void = elf_findsecbyname(elf, ".dynstr");
1074
1075 if (elf->phdr && strtbl_void) {
1076#define SHOW_SONAME(B) \
1077 if (elf->elf_class == ELFCLASS ## B) { \
1078 Elf ## B ## _Dyn *dyn; \
1079 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1080 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1081 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
1082 Elf ## B ## _Off offset; \
1083 /* only look for soname in shared objects */ \
1084 if (EGET(ehdr->e_type) != ET_DYN) \
1085 return NULL; \
1086 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1087 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1088 offset = EGET(phdr[i].p_offset); \
1089 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
1090 dyn = DYN ## B (elf->vdata + offset); \
1091 while (EGET(dyn->d_tag) != DT_NULL) { \
1092 if (EGET(dyn->d_tag) == DT_SONAME) { \
1093 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
1094 if (offset >= (Elf ## B ## _Off)elf->len) { \
1095 ++dyn; \
1096 continue; \
1097 } \
1098 soname = elf->data + offset; \
1099 *found_soname = 1; \
1100 return (be_wewy_wewy_quiet ? NULL : soname); \
1101 } \
1102 ++dyn; \
1103 } \
1104 } }
1105 SHOW_SONAME(32)
1106 SHOW_SONAME(64)
1107 }
1108
1109 return NULL;
1110}
1111
1112/*
1113 * We support the symbol form:
1114 * [%[modifiers]%][[+-]<symbol name>][,[.....]]
1115 * If the symbol name is empty, then all symbols are matched.
1116 * If the symbol name is a glob ("*"), then all symbols are dumped (debug).
1117 * Do not rely on this output format at all.
1118 * Otherwise the symbol name is used to search (either regex or string compare).
1119 * If the first char of the symbol name is a plus ("+"), then only match
1120 * defined symbols. If it's a minus ("-"), only match undefined symbols.
1121 * Putting modifiers in between the percent signs allows for more in depth
1122 * filters. There are groups of modifiers. If you don't specify a member
1123 * of a group, then all types in that group are matched. The current
1124 * groups and their types are:
1125 * STT group: STT_NOTYPE:n STT_OBJECT:o STT_FUNC:f STT_FILE:F
1126 * STB group: STB_LOCAL:l STB_GLOBAL:g STB_WEAK:w
1127 * SHN group: SHN_UNDEF:u SHN_ABS:a SHN_COMMON:c {defined}:d
1128 * The "defined" value in the SHN group does not correspond to a SHN_xxx define.
1129 * You can search for multiple symbols at once by seperating with a comma (",").
1130 *
1131 * Some examples:
1132 * ELFs with a weak function "foo":
1133 * scanelf -s %wf%foo <ELFs>
1134 * ELFs that define the symbol "main":
1135 * scanelf -s +main <ELFs>
1136 * scanelf -s %d%main <ELFs>
1137 * ELFs that refer to the undefined symbol "brk":
1138 * scanelf -s -brk <ELFs>
1139 * scanelf -s %u%brk <ELFs>
1140 * All global defined objects in an ELF:
1141 * scanelf -s %ogd% <ELF>
1142 */
1143static void
1144scanelf_match_symname(elfobj *elf, char *found_sym, char **ret, size_t *ret_len, const char *symname,
1145 unsigned int stt, unsigned int stb, unsigned int shn, unsigned long size)
1146{
1147 char *this_sym, *next_sym, saved = saved;
1148
1149 /* allow the user to specify a comma delimited list of symbols to search for */
1150 next_sym = NULL;
1151 do {
1152 bool inc_notype, inc_object, inc_func, inc_file,
1153 inc_local, inc_global, inc_weak,
1154 inc_def, inc_undef, inc_abs, inc_common;
1155
1156 if (next_sym) {
1157 next_sym[-1] = saved;
1158 this_sym = next_sym;
1159 } else
1160 this_sym = find_sym;
1161 if ((next_sym = strchr(this_sym, ','))) {
1162 /* make parsing easier by killing the comma temporarily */
1163 saved = *next_sym;
1164 *next_sym = '\0';
1165 next_sym += 1;
1166 }
1167
1168 /* symbol selection! */
1169 inc_notype = inc_object = inc_func = inc_file = \
1170 inc_local = inc_global = inc_weak = \
1171 inc_def = inc_undef = inc_abs = inc_common = \
1172 (*this_sym != '%');
1173
1174 /* parse the contents of %...% */
1175 if (!inc_notype) {
1176 while (*(this_sym++)) {
1177 if (*this_sym == '%') {
1178 ++this_sym;
1179 break;
1180 }
1181 switch (*this_sym) {
1182 case 'n': inc_notype = true; break;
1183 case 'o': inc_object = true; break;
1184 case 'f': inc_func = true; break;
1185 case 'F': inc_file = true; break;
1186 case 'l': inc_local = true; break;
1187 case 'g': inc_global = true; break;
1188 case 'w': inc_weak = true; break;
1189 case 'd': inc_def = true; break;
1190 case 'u': inc_undef = true; break;
1191 case 'a': inc_abs = true; break;
1192 case 'c': inc_common = true; break;
1193 default: err("invalid symbol selector '%c'", *this_sym);
1194 }
1195 }
1196
1197 /* If no types are matched, not match all */
1198 if (!inc_notype && !inc_object && !inc_func && !inc_file)
1199 inc_notype = inc_object = inc_func = inc_file = true;
1200 if (!inc_local && !inc_global && !inc_weak)
1201 inc_local = inc_global = inc_weak = true;
1202 if (!inc_def && !inc_undef && !inc_abs && !inc_common)
1203 inc_def = inc_undef = inc_abs = inc_common = true;
1204
1205 /* backwards compat for defined/undefined short hand */
1206 } else if (*this_sym == '+') {
1207 inc_undef = false;
1208 ++this_sym;
1209 } else if (*this_sym == '-') {
1210 inc_def = inc_abs = inc_common = false;
1211 ++this_sym;
1212 }
1213
1214 /* filter symbols */
1215 if ((!inc_notype && stt == STT_NOTYPE) || \
1216 (!inc_object && stt == STT_OBJECT) || \
1217 (!inc_func && stt == STT_FUNC ) || \
1218 (!inc_file && stt == STT_FILE ) || \
1219 (!inc_local && stb == STB_LOCAL ) || \
1220 (!inc_global && stb == STB_GLOBAL) || \
1221 (!inc_weak && stb == STB_WEAK ) || \
1222 (!inc_def && shn && shn < SHN_LORESERVE) || \
1223 (!inc_undef && shn == SHN_UNDEF ) || \
1224 (!inc_abs && shn == SHN_ABS ) || \
1225 (!inc_common && shn == SHN_COMMON))
1226 continue;
1227
1228 if (*this_sym == '*') {
1229 /* a "*" symbol gets you debug output */
1230 printf("%s(%s) %5lX %15s %15s %15s %s\n",
1231 ((*found_sym == 0) ? "\n\t" : "\t"),
1232 elf->base_filename,
1233 size,
1234 get_elfstttype(stt),
1235 get_elfstbtype(stb),
1236 get_elfshntype(shn),
1237 symname);
1238 goto matched;
1239
1240 } else {
1241 if (g_match) {
1242 /* regex match the symbol */
1243 if (rematch(this_sym, symname, REG_EXTENDED) != 0)
1244 continue;
1245
1246 } else if (*this_sym) {
1247 /* give empty symbols a "pass", else do a normal compare */
1248 const size_t len = strlen(this_sym);
1249 if (!(strncmp(this_sym, symname, len) == 0 &&
1250 /* Accept unversioned symbol names */
1251 (symname[len] == '\0' || symname[len] == '@')))
1252 continue;
1253 }
1254
1255 if (be_semi_verbose) {
1256 char buf[1024];
1257 snprintf(buf, sizeof(buf), "%lX %s %s",
1258 size,
1259 get_elfstttype(stt),
1260 this_sym);
1261 *ret = xstrdup(buf);
1262 } else {
1263 if (*ret) xchrcat(ret, ',', ret_len);
1264 xstrcat(ret, symname, ret_len);
1265 }
1266
1267 goto matched;
1268 }
1269 } while (next_sym);
1270
1271 return;
1272
1273 matched:
1274 *found_sym = 1;
1275 if (next_sym)
1276 next_sym[-1] = saved;
1277}
1278
1279static const char *scanelf_file_sym(elfobj *elf, char *found_sym)
1280{
1281 char *ret;
560 void *symtab_void, *strtab_void; 1282 void *symtab_void, *strtab_void;
561 1283
562 if (!find_sym) return NULL; 1284 if (!find_sym) return NULL;
1285 ret = NULL;
563 1286
564 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void); 1287 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
565 1288
566 if (symtab_void && strtab_void) { 1289 if (symtab_void && strtab_void) {
567#define FIND_SYM(B) \ 1290#define FIND_SYM(B) \
568 if (elf->elf_class == ELFCLASS ## B) { \ 1291 if (elf->elf_class == ELFCLASS ## B) { \
569 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 1292 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
570 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 1293 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
571 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 1294 Elf ## B ## _Sym *sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
572 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 1295 Elf ## B ## _Word i, cnt = EGET(symtab->sh_entsize); \
573 char *symname; \ 1296 char *symname; \
1297 size_t ret_len = 0; \
1298 if (cnt) \
1299 cnt = EGET(symtab->sh_size) / cnt; \
574 for (i = 0; i < cnt; ++i) { \ 1300 for (i = 0; i < cnt; ++i) { \
1301 if ((void*)sym > elf->data_end) { \
1302 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1303 goto break_out; \
1304 } \
575 if (sym->st_name) { \ 1305 if (sym->st_name) { \
1306 /* make sure the symbol name is in acceptable memory range */ \
576 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 1307 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
577 if (*find_sym == '*') { \ 1308 if ((void*)symname > elf->data_end) { \
578 printf("%s(%s) %5lX %15s %s\n", \ 1309 warnf("%s: corrupt ELF symbols", elf->filename); \
579 ((*found_sym == 0) ? "\n\t" : "\t"), \ 1310 ++sym; \
580 elf->base_filename, \ 1311 continue; \
581 (long)sym->st_size, \ 1312 } \
582 (char *)get_elfstttype(sym->st_info), \ 1313 scanelf_match_symname(elf, found_sym, \
583 symname); \ 1314 &ret, &ret_len, symname, \
584 *found_sym = 1; \ 1315 ELF##B##_ST_TYPE(EGET(sym->st_info)), \
585 } else if ((strcmp(find_sym, symname) == 0) || \ 1316 ELF##B##_ST_BIND(EGET(sym->st_info)), \
586 (strcmp(symname, versioned_symname) == 0)) \ 1317 EGET(sym->st_shndx), \
587 (*found_sym)++; \ 1318 /* st_size can be 64bit, but no one is really that big, so screw em */ \
1319 EGET(sym->st_size)); \
588 } \ 1320 } \
589 ++sym; \ 1321 ++sym; \
590 } } 1322 } \
1323 }
591 FIND_SYM(32) 1324 FIND_SYM(32)
592 FIND_SYM(64) 1325 FIND_SYM(64)
593 } 1326 }
594 1327
1328break_out:
595 if (be_wewy_wewy_quiet) return NULL; 1329 if (be_wewy_wewy_quiet) return NULL;
596 1330
597 if (*find_sym != '*' && *found_sym) 1331 if (*find_sym != '*' && *found_sym)
598 return find_sym; 1332 return ret;
599 if (be_quiet) 1333 if (be_quiet)
600 return NULL; 1334 return NULL;
601 else 1335 else
602 return (char *)" - "; 1336 return " - ";
603} 1337}
1338
1339static const char *scanelf_file_sections(elfobj *elf, char *found_section)
1340{
1341 if (!find_section)
1342 return NULL;
1343
1344#define FIND_SECTION(B) \
1345 if (elf->elf_class == ELFCLASS ## B) { \
1346 size_t matched, n; \
1347 int invert; \
1348 const char *section_name; \
1349 Elf ## B ## _Shdr *section; \
1350 \
1351 matched = 0; \
1352 array_for_each(find_section_arr, n, section_name) { \
1353 invert = (*section_name == '!' ? 1 : 0); \
1354 section = SHDR ## B (elf_findsecbyname(elf, section_name + invert)); \
1355 if ((section == NULL && invert) || (section != NULL && !invert)) \
1356 ++matched; \
1357 } \
1358 \
1359 if (matched == array_cnt(find_section_arr)) \
1360 *found_section = 1; \
1361 }
1362 FIND_SECTION(32)
1363 FIND_SECTION(64)
1364
1365 if (be_wewy_wewy_quiet)
1366 return NULL;
1367
1368 if (*found_section)
1369 return find_section;
1370
1371 if (be_quiet)
1372 return NULL;
1373 else
1374 return " - ";
1375}
1376
604/* scan an elf file and show all the fun stuff */ 1377/* scan an elf file and show all the fun stuff */
605#define prints(str) write(fileno(stdout), str, strlen(str)) 1378#define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
606static void scanelf_file(const char *filename) 1379static int scanelf_elfobj(elfobj *elf)
607{ 1380{
608 unsigned long i; 1381 unsigned long i;
609 char found_pax, found_phdr, found_relro, found_load, found_textrel, 1382 char found_pax, found_phdr, found_relro, found_load, found_textrel,
610 found_rpath, found_needed, found_interp, found_bind, 1383 found_rpath, found_needed, found_interp, found_bind, found_soname,
611 found_sym, found_lib, found_file, found_textrels; 1384 found_sym, found_lib, found_file, found_textrels, found_section;
612 elfobj *elf;
613 struct stat st;
614 static char *out_buffer = NULL; 1385 static char *out_buffer = NULL;
615 static size_t out_len; 1386 static size_t out_len;
616 1387
617 /* make sure 'filename' exists */
618 if (lstat(filename, &st) == -1) {
619 if (be_verbose > 2) printf("%s: does not exist\n", filename);
620 return;
621 }
622 /* always handle regular files and handle symlinked files if no -y */
623 if (S_ISLNK(st.st_mode)) {
624 if (!scan_symlink) return;
625 stat(filename, &st);
626 }
627 if (!S_ISREG(st.st_mode)) {
628 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
629 return;
630 }
631
632 found_pax = found_phdr = found_relro = found_load = found_textrel = \ 1388 found_pax = found_phdr = found_relro = found_load = found_textrel = \
633 found_rpath = found_needed = found_interp = found_bind = \ 1389 found_rpath = found_needed = found_interp = found_bind = found_soname = \
634 found_sym = found_lib = found_file = found_textrels = 0; 1390 found_sym = found_lib = found_file = found_textrels = found_section = 0;
635 1391
636 /* verify this is real ELF */
637 if ((elf = readelf(filename)) == NULL) {
638 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
639 return;
640 }
641
642 if (be_verbose > 1) 1392 if (be_verbose > 2)
643 printf("%s: scanning file {%s,%s}\n", filename, 1393 printf("%s: scanning file {%s,%s}\n", elf->filename,
644 get_elfeitype(EI_CLASS, elf->elf_class), 1394 get_elfeitype(EI_CLASS, elf->elf_class),
645 get_elfeitype(EI_DATA, elf->data[EI_DATA])); 1395 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
646 else if (be_verbose) 1396 else if (be_verbose > 1)
647 printf("%s: scanning file\n", filename); 1397 printf("%s: scanning file\n", elf->filename);
648 1398
649 /* init output buffer */ 1399 /* init output buffer */
650 if (!out_buffer) { 1400 if (!out_buffer) {
651 out_len = sizeof(char) * 80; 1401 out_len = sizeof(char) * 80;
652 out_buffer = (char*)xmalloc(out_len); 1402 out_buffer = xmalloc(out_len);
653 } 1403 }
654 *out_buffer = '\0'; 1404 *out_buffer = '\0';
655 1405
656 /* show the header */ 1406 /* show the header */
657 if (!be_quiet && show_banner) { 1407 if (!be_quiet && show_banner) {
658 for (i = 0; out_format[i]; ++i) { 1408 for (i = 0; out_format[i]; ++i) {
659 if (!IS_MODIFIER(out_format[i])) continue; 1409 if (!IS_MODIFIER(out_format[i])) continue;
660 1410
661 switch (out_format[++i]) { 1411 switch (out_format[++i]) {
1412 case '+': break;
662 case '%': break; 1413 case '%': break;
663 case '#': break; 1414 case '#': break;
664 case 'F': 1415 case 'F':
665 case 'p': 1416 case 'p':
666 case 'f': prints("FILE "); found_file = 1; break; 1417 case 'f': prints("FILE "); found_file = 1; break;
667 case 'o': prints(" TYPE "); break; 1418 case 'o': prints(" TYPE "); break;
668 case 'x': prints(" PAX "); break; 1419 case 'x': prints(" PAX "); break;
669 case 'e': prints("STK/REL/PTL "); break; 1420 case 'e': prints("STK/REL/PTL "); break;
670 case 't': prints("TEXTREL "); break; 1421 case 't': prints("TEXTREL "); break;
671 case 'r': prints("RPATH "); break; 1422 case 'r': prints("RPATH "); break;
1423 case 'M': prints("CLASS "); break;
672 case 'n': prints("NEEDED "); break; 1424 case 'n': prints("NEEDED "); break;
673 case 'i': prints("INTERP "); break; 1425 case 'i': prints("INTERP "); break;
674 case 'b': prints("BIND "); break; 1426 case 'b': prints("BIND "); break;
1427 case 'Z': prints("SIZE "); break;
1428 case 'S': prints("SONAME "); break;
675 case 's': prints("SYM "); break; 1429 case 's': prints("SYM "); break;
676 case 'N': prints("LIB "); break; 1430 case 'N': prints("LIB "); break;
677 case 'T': prints("TEXTRELS "); break; 1431 case 'T': prints("TEXTRELS "); break;
1432 case 'k': prints("SECTION "); break;
1433 case 'a': prints("ARCH "); break;
1434 case 'I': prints("OSABI "); break;
1435 case 'Y': prints("EABI "); break;
1436 case 'O': prints("PERM "); break;
1437 case 'D': prints("ENDIAN "); break;
678 default: warnf("'%c' has no title ?", out_format[i]); 1438 default: warnf("'%c' has no title ?", out_format[i]);
679 } 1439 }
680 } 1440 }
681 if (!found_file) prints("FILE "); 1441 if (!found_file) prints("FILE ");
682 prints("\n"); 1442 prints("\n");
686 1446
687 /* dump all the good stuff */ 1447 /* dump all the good stuff */
688 for (i = 0; out_format[i]; ++i) { 1448 for (i = 0; out_format[i]; ++i) {
689 const char *out; 1449 const char *out;
690 const char *tmp; 1450 const char *tmp;
691 1451 static char ubuf[sizeof(unsigned long)*2];
692 /* make sure we trim leading spaces in quiet mode */
693 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
694 *out_buffer = '\0';
695
696 if (!IS_MODIFIER(out_format[i])) { 1452 if (!IS_MODIFIER(out_format[i])) {
697 xchrcat(&out_buffer, out_format[i], &out_len); 1453 xchrcat(&out_buffer, out_format[i], &out_len);
698 continue; 1454 continue;
699 } 1455 }
700 1456
701 out = NULL; 1457 out = NULL;
702 be_wewy_wewy_quiet = (out_format[i] == '#'); 1458 be_wewy_wewy_quiet = (out_format[i] == '#');
1459 be_semi_verbose = (out_format[i] == '+');
703 switch (out_format[++i]) { 1460 switch (out_format[++i]) {
1461 case '+':
704 case '%': 1462 case '%':
705 case '#': 1463 case '#':
706 xchrcat(&out_buffer, out_format[i], &out_len); break; 1464 xchrcat(&out_buffer, out_format[i], &out_len); break;
707 case 'F': 1465 case 'F':
708 found_file = 1; 1466 found_file = 1;
709 if (be_wewy_wewy_quiet) break; 1467 if (be_wewy_wewy_quiet) break;
710 xstrcat(&out_buffer, filename, &out_len); 1468 xstrcat(&out_buffer, elf->filename, &out_len);
711 break; 1469 break;
712 case 'p': 1470 case 'p':
713 found_file = 1; 1471 found_file = 1;
714 if (be_wewy_wewy_quiet) break; 1472 if (be_wewy_wewy_quiet) break;
715 tmp = filename; 1473 tmp = elf->filename;
716 if (search_path) { 1474 if (search_path) {
717 ssize_t len_search = strlen(search_path); 1475 ssize_t len_search = strlen(search_path);
718 ssize_t len_file = strlen(filename); 1476 ssize_t len_file = strlen(elf->filename);
719 if (!strncmp(filename, search_path, len_search) && \ 1477 if (!strncmp(elf->filename, search_path, len_search) && \
720 len_file > len_search) 1478 len_file > len_search)
721 tmp += len_search; 1479 tmp += len_search;
722 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++; 1480 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
723 } 1481 }
724 xstrcat(&out_buffer, tmp, &out_len); 1482 xstrcat(&out_buffer, tmp, &out_len);
725 break; 1483 break;
726 case 'f': 1484 case 'f':
727 found_file = 1; 1485 found_file = 1;
728 if (be_wewy_wewy_quiet) break; 1486 if (be_wewy_wewy_quiet) break;
729 tmp = strrchr(filename, '/'); 1487 tmp = strrchr(elf->filename, '/');
730 tmp = (tmp == NULL ? filename : tmp+1); 1488 tmp = (tmp == NULL ? elf->filename : tmp+1);
731 xstrcat(&out_buffer, tmp, &out_len); 1489 xstrcat(&out_buffer, tmp, &out_len);
732 break; 1490 break;
733 case 'o': out = get_elfetype(elf); break; 1491 case 'o': out = get_elfetype(elf); break;
734 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1492 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
735 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break; 1493 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
736 case 't': out = scanelf_file_textrel(elf, &found_textrel); break; 1494 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
737 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break; 1495 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
738 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break; 1496 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1497 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1498 case 'D': out = get_endian(elf); break;
1499 case 'O': out = strfileperms(elf->filename); break;
739 case 'n': 1500 case 'n':
740 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break; 1501 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
741 case 'i': out = scanelf_file_interp(elf, &found_interp); break; 1502 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
742 case 'b': out = scanelf_file_bind(elf, &found_bind); break; 1503 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1504 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
743 case 's': out = scanelf_file_sym(elf, &found_sym); break; 1505 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1506 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1507 case 'a': out = get_elfemtype(elf); break;
1508 case 'I': out = get_elfosabi(elf); break;
1509 case 'Y': out = get_elf_eabi(elf); break;
1510 case 'Z': snprintf(ubuf, sizeof(ubuf), "%lu", (unsigned long)elf->len); out = ubuf; break;;
744 default: warnf("'%c' has no scan code?", out_format[i]); 1511 default: warnf("'%c' has no scan code?", out_format[i]);
745 } 1512 }
1513 if (out)
746 if (out) xstrcat(&out_buffer, out, &out_len); 1514 xstrcat(&out_buffer, out, &out_len);
747 } 1515 }
748 1516
749#define FOUND_SOMETHING() \ 1517#define FOUND_SOMETHING() \
750 (found_pax || found_phdr || found_relro || found_load || found_textrel || \ 1518 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
751 found_rpath || found_needed || found_interp || found_bind || \ 1519 found_rpath || found_needed || found_interp || found_bind || \
752 found_sym || found_lib || found_textrels) 1520 found_soname || found_sym || found_lib || found_textrels || found_section )
753 1521
754 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) { 1522 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
755 xchrcat(&out_buffer, ' ', &out_len); 1523 xchrcat(&out_buffer, ' ', &out_len);
756 xstrcat(&out_buffer, filename, &out_len); 1524 xstrcat(&out_buffer, elf->filename, &out_len);
757 } 1525 }
758 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) { 1526 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
759 puts(out_buffer); 1527 puts(out_buffer);
760 fflush(stdout); 1528 fflush(stdout);
761 } 1529 }
762 1530
1531 return 0;
1532}
1533
1534/* scan a single elf */
1535static int scanelf_elf(const char *filename, int fd, size_t len)
1536{
1537 int ret = 1;
1538 elfobj *elf;
1539
1540 /* verify this is real ELF */
1541 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1542 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1543 return 2;
1544 }
1545 switch (match_bits) {
1546 case 32:
1547 if (elf->elf_class != ELFCLASS32)
1548 goto label_done;
1549 break;
1550 case 64:
1551 if (elf->elf_class != ELFCLASS64)
1552 goto label_done;
1553 break;
1554 default: break;
1555 }
1556 if (match_etypes) {
1557 char sbuf[126];
1558 strncpy(sbuf, match_etypes, sizeof(sbuf));
1559 if (strchr(match_etypes, ',') != NULL) {
1560 char *p;
1561 while ((p = strrchr(sbuf, ',')) != NULL) {
1562 *p = 0;
1563 if (etype_lookup(p+1) == get_etype(elf))
1564 goto label_ret;
1565 }
1566 }
1567 if (etype_lookup(sbuf) != get_etype(elf))
1568 goto label_done;
1569 }
1570
1571label_ret:
1572 ret = scanelf_elfobj(elf);
1573
1574label_done:
763 unreadelf(elf); 1575 unreadelf(elf);
1576 return ret;
1577}
1578
1579/* scan an archive of elfs */
1580static int scanelf_archive(const char *filename, int fd, size_t len)
1581{
1582 archive_handle *ar;
1583 archive_member *m;
1584 char *ar_buffer;
1585 elfobj *elf;
1586
1587 ar = ar_open_fd(filename, fd);
1588 if (ar == NULL)
1589 return 1;
1590
1591 ar_buffer = mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1592 while ((m = ar_next(ar)) != NULL) {
1593 off_t cur_pos = lseek(fd, 0, SEEK_CUR);
1594 if (cur_pos == -1)
1595 errp("lseek() failed");
1596 elf = readelf_buffer(m->name, ar_buffer + cur_pos, m->size);
1597 if (elf) {
1598 scanelf_elfobj(elf);
1599 unreadelf(elf);
1600 }
1601 }
1602 munmap(ar_buffer, len);
1603
1604 return 0;
1605}
1606/* scan a file which may be an elf or an archive or some other magical beast */
1607static int scanelf_fileat(int dir_fd, const char *filename, const struct stat *st_cache)
1608{
1609 const struct stat *st = st_cache;
1610 struct stat symlink_st;
1611 int fd;
1612
1613 /* always handle regular files and handle symlinked files if no -y */
1614 if (S_ISLNK(st->st_mode)) {
1615 if (!scan_symlink)
1616 return 1;
1617 fstatat(dir_fd, filename, &symlink_st, 0);
1618 st = &symlink_st;
1619 }
1620
1621 if (!S_ISREG(st->st_mode)) {
1622 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1623 return 1;
1624 }
1625
1626 if (match_perms) {
1627 if ((st->st_mode | match_perms) != st->st_mode)
1628 return 1;
1629 }
1630 fd = openat(dir_fd, filename, (fix_elf ? O_RDWR : O_RDONLY) | O_CLOEXEC);
1631 if (fd == -1)
1632 return 1;
1633
1634 if (scanelf_elf(filename, fd, st->st_size) == 2) {
1635 /* if it isn't an ELF, maybe it's an .a archive */
1636 if (scan_archives)
1637 scanelf_archive(filename, fd, st->st_size);
1638
1639 /*
1640 * unreadelf() implicitly closes its fd, so only close it
1641 * when we are returning it in the non-ELF case
1642 */
1643 close(fd);
1644 }
1645
1646 return 0;
764} 1647}
765 1648
766/* scan a directory for ET_EXEC files and print when we find one */ 1649/* scan a directory for ET_EXEC files and print when we find one */
767static void scanelf_dir(const char *path) 1650static int scanelf_dirat(int dir_fd, const char *path)
768{ 1651{
769 register DIR *dir; 1652 register DIR *dir;
770 register struct dirent *dentry; 1653 register struct dirent *dentry;
771 struct stat st_top, st; 1654 struct stat st_top, st;
772 char buf[_POSIX_PATH_MAX]; 1655 char buf[__PAX_UTILS_PATH_MAX], *subpath;
773 size_t pathlen = 0, len = 0; 1656 size_t pathlen = 0, len = 0;
1657 int ret = 0;
1658 int subdir_fd;
774 1659
775 /* make sure path exists */ 1660 /* make sure path exists */
776 if (lstat(path, &st_top) == -1) { 1661 if (fstatat(dir_fd, path, &st_top, AT_SYMLINK_NOFOLLOW) == -1) {
777 if (be_verbose > 2) printf("%s: does not exist\n", path); 1662 if (be_verbose > 2) printf("%s: does not exist\n", path);
778 return; 1663 return 1;
779 } 1664 }
780 1665
781 /* ok, if it isn't a directory, assume we can open it */ 1666 /* ok, if it isn't a directory, assume we can open it */
782 if (!S_ISDIR(st_top.st_mode)) { 1667 if (!S_ISDIR(st_top.st_mode))
783 scanelf_file(path); 1668 return scanelf_fileat(dir_fd, path, &st_top);
784 return;
785 }
786 1669
787 /* now scan the dir looking for fun stuff */ 1670 /* now scan the dir looking for fun stuff */
788 if ((dir = opendir(path)) == NULL) { 1671 subdir_fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
789 warnf("could not opendir %s: %s", path, strerror(errno)); 1672 if (subdir_fd == -1)
1673 dir = NULL;
1674 else
1675 dir = fdopendir(subdir_fd);
1676 if (dir == NULL) {
1677 if (subdir_fd != -1)
1678 close(subdir_fd);
1679 warnfp("could not opendir(%s)", path);
790 return; 1680 return 1;
791 } 1681 }
792 if (be_verbose) printf("%s: scanning dir\n", path); 1682 if (be_verbose > 1) printf("%s: scanning dir\n", path);
793 1683
794 pathlen = strlen(path); 1684 subpath = stpcpy(buf, path);
1685 *subpath++ = '/';
1686 pathlen = subpath - buf;
795 while ((dentry = readdir(dir))) { 1687 while ((dentry = readdir(dir))) {
796 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1688 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
797 continue; 1689 continue;
798 len = (pathlen + 1 + strlen(dentry->d_name) + 1); 1690
799 if (len >= sizeof(buf)) { 1691 if (fstatat(subdir_fd, dentry->d_name, &st, AT_SYMLINK_NOFOLLOW) == -1)
800 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
801 (unsigned long)len, (unsigned long)sizeof(buf));
802 continue; 1692 continue;
1693
1694 len = strlen(dentry->d_name);
1695 if (len + pathlen + 1 >= sizeof(buf)) {
1696 warnf("Skipping '%s%s': len > sizeof(buf); %zu > %zu\n",
1697 path, dentry->d_name, len + pathlen + 1, sizeof(buf));
1698 continue;
803 } 1699 }
804 sprintf(buf, "%s/%s", path, dentry->d_name); 1700 memcpy(subpath, dentry->d_name, len);
805 if (lstat(buf, &st) != -1) { 1701 subpath[len] = '\0';
1702
806 if (S_ISREG(st.st_mode)) 1703 if (S_ISREG(st.st_mode))
807 scanelf_file(buf); 1704 ret = scanelf_fileat(dir_fd, buf, &st);
808 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1705 else if (dir_recurse && S_ISDIR(st.st_mode)) {
809 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1706 if (dir_crossmount || (st_top.st_dev == st.st_dev))
810 scanelf_dir(buf); 1707 ret = scanelf_dirat(dir_fd, buf);
811 }
812 } 1708 }
813 } 1709 }
814 closedir(dir); 1710 closedir(dir);
815}
816 1711
1712 return ret;
1713}
1714static int scanelf_dir(const char *path)
1715{
1716 return scanelf_dirat(root_fd, root_rel_path(path));
1717}
1718
817static int scanelf_from_file(char *filename) 1719static int scanelf_from_file(const char *filename)
818{ 1720{
819 FILE *fp = NULL; 1721 FILE *fp;
820 char *p; 1722 char *p, *path;
821 char path[_POSIX_PATH_MAX]; 1723 size_t len;
1724 int ret;
822 1725
823 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL)) 1726 if (strcmp(filename, "-") == 0)
824 fp = stdin; 1727 fp = stdin;
825 else if ((fp = fopen(filename, "r")) == NULL) 1728 else if ((fp = fopen(filename, "r")) == NULL)
826 return 1; 1729 return 1;
827 1730
828 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1731 path = NULL;
1732 len = 0;
1733 ret = 0;
1734 while (getline(&path, &len, fp) != -1) {
829 if ((p = strchr(path, '\n')) != NULL) 1735 if ((p = strchr(path, '\n')) != NULL)
830 *p = 0; 1736 *p = 0;
831 search_path = path; 1737 search_path = path;
832 scanelf_dir(path); 1738 ret = scanelf_dir(path);
833 } 1739 }
1740 free(path);
1741
834 if (fp != stdin) 1742 if (fp != stdin)
835 fclose(fp); 1743 fclose(fp);
1744
836 return 0; 1745 return ret;
837} 1746}
838 1747
839static void load_ld_so_conf() 1748#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1749
1750static int load_ld_cache_config(int i, const char *fname)
840{ 1751{
841 FILE *fp = NULL; 1752 FILE *fp = NULL;
842 char *p; 1753 char *p, *path;
843 char path[_POSIX_PATH_MAX]; 1754 size_t len;
844 int i = 0; 1755 int curr_fd = -1;
845 1756
846 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1757 fp = fopenat_r(root_fd, root_rel_path(fname));
1758 if (fp == NULL)
847 return; 1759 return i;
848 1760
849 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1761 path = NULL;
850 if (*path != '/') 1762 len = 0;
851 continue; 1763 while (getline(&path, &len, fp) != -1) {
852
853 if ((p = strrchr(path, '\r')) != NULL) 1764 if ((p = strrchr(path, '\r')) != NULL)
854 *p = 0; 1765 *p = 0;
855 if ((p = strchr(path, '\n')) != NULL) 1766 if ((p = strchr(path, '\n')) != NULL)
856 *p = 0; 1767 *p = 0;
857 1768
858 ldpaths[i++] = xstrdup(path); 1769 /* recursive includes of the same file will make this segfault. */
1770 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1771 glob_t gl;
1772 size_t x;
1773 const char *gpath;
859 1774
860 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths)) 1775 /* re-use existing path buffer ... need to be creative */
861 break; 1776 if (path[8] != '/')
1777 gpath = memcpy(path + 3, "/etc/", 5);
1778 else
1779 gpath = path + 8;
1780 if (root_fd != AT_FDCWD) {
1781 if (curr_fd == -1) {
1782 curr_fd = open(".", O_RDONLY|O_CLOEXEC);
1783 if (fchdir(root_fd))
1784 errp("unable to change to root dir");
1785 }
1786 gpath = root_rel_path(gpath);
1787 }
1788
1789 if (glob(gpath, 0, NULL, &gl) == 0) {
1790 for (x = 0; x < gl.gl_pathc; ++x) {
1791 /* try to avoid direct loops */
1792 if (strcmp(gl.gl_pathv[x], fname) == 0)
1793 continue;
1794 i = load_ld_cache_config(i, gl.gl_pathv[x]);
1795 }
1796 globfree(&gl);
1797 }
1798
1799 /* failed globs are ignored by glibc */
1800 continue;
862 } 1801 }
863 ldpaths[i] = NULL; 1802
1803 if (*path != '/')
1804 continue;
1805
1806 xarraypush_str(ldpaths, path);
1807 }
1808 free(path);
864 1809
865 fclose(fp); 1810 fclose(fp);
1811
1812 if (curr_fd != -1) {
1813 if (fchdir(curr_fd))
1814 /* don't care */;
1815 close(curr_fd);
1816 }
1817
1818 return i;
866} 1819}
1820
1821#elif defined(__FreeBSD__) || defined(__DragonFly__)
1822
1823static int load_ld_cache_config(int i, const char *fname)
1824{
1825 FILE *fp = NULL;
1826 char *b = NULL, *p;
1827 struct elfhints_hdr hdr;
1828
1829 fp = fopenat_r(root_fd, root_rel_path(fname));
1830 if (fp == NULL)
1831 return i;
1832
1833 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1834 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1835 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1836 {
1837 fclose(fp);
1838 return i;
1839 }
1840
1841 b = xmalloc(hdr.dirlistlen + 1);
1842 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1843 fclose(fp);
1844 free(b);
1845 return i;
1846 }
1847
1848 while ((p = strsep(&b, ":"))) {
1849 if (*p == '\0')
1850 continue;
1851 xarraypush_str(ldpaths, p);
1852 }
1853
1854 free(b);
1855 fclose(fp);
1856 return i;
1857}
1858
1859#else
1860#ifdef __ELF__
1861#warning Cache config support not implemented for your target
1862#endif
1863static int load_ld_cache_config(int i, const char *fname)
1864{
1865 return 0;
1866}
1867#endif
867 1868
868/* scan /etc/ld.so.conf for paths */ 1869/* scan /etc/ld.so.conf for paths */
869static void scanelf_ldpath() 1870static void scanelf_ldpath(void)
870{ 1871{
871 char scan_l, scan_ul, scan_ull; 1872 char scan_l, scan_ul, scan_ull;
1873 size_t n;
1874 const char *ldpath;
872 int i = 0; 1875 int i = 0;
873 1876
874 if (!ldpaths[0]) 1877 if (array_cnt(ldpaths) == 0)
875 err("Unable to load any paths from ld.so.conf"); 1878 err("Unable to load any paths from ld.so.conf");
876 1879
877 scan_l = scan_ul = scan_ull = 0; 1880 scan_l = scan_ul = scan_ull = 0;
878 1881
879 while (ldpaths[i]) { 1882 array_for_each(ldpaths, n, ldpath) {
880 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1; 1883 if (!scan_l && !strcmp(ldpath, "/lib")) scan_l = 1;
881 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1; 1884 if (!scan_ul && !strcmp(ldpath, "/usr/lib")) scan_ul = 1;
882 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1; 1885 if (!scan_ull && !strcmp(ldpath, "/usr/local/lib")) scan_ull = 1;
883 scanelf_dir(ldpaths[i]); 1886 scanelf_dir(ldpath);
884 ++i; 1887 ++i;
885 } 1888 }
886 1889
887 if (!scan_l) scanelf_dir("/lib"); 1890 if (!scan_l) scanelf_dir("/lib");
888 if (!scan_ul) scanelf_dir("/usr/lib"); 1891 if (!scan_ul) scanelf_dir("/usr/lib");
889 if (!scan_ull) scanelf_dir("/usr/local/lib"); 1892 if (!scan_ull) scanelf_dir("/usr/local/lib");
890} 1893}
891 1894
892/* scan env PATH for paths */ 1895/* scan env PATH for paths */
893static void scanelf_envpath() 1896static void scanelf_envpath(void)
894{ 1897{
895 char *path, *p; 1898 char *path, *p;
896 1899
897 path = getenv("PATH"); 1900 path = getenv("PATH");
898 if (!path) 1901 if (!path)
905 } 1908 }
906 1909
907 free(path); 1910 free(path);
908} 1911}
909 1912
910 1913/* usage / invocation handling functions */ /* Free Flags: c d j u w G H J K P Q U W */
911
912/* usage / invocation handling functions */
913#define PARSE_FLAGS "plRmyxetrnibs:N:TaqvF:f:o:BhV" 1914#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZCBhV"
914#define a_argument required_argument 1915#define a_argument required_argument
915static struct option const long_opts[] = { 1916static struct option const long_opts[] = {
916 {"path", no_argument, NULL, 'p'}, 1917 {"path", no_argument, NULL, 'p'},
917 {"ldpath", no_argument, NULL, 'l'}, 1918 {"ldpath", no_argument, NULL, 'l'},
1919 {"root", a_argument, NULL, 128},
918 {"recursive", no_argument, NULL, 'R'}, 1920 {"recursive", no_argument, NULL, 'R'},
919 {"mount", no_argument, NULL, 'm'}, 1921 {"mount", no_argument, NULL, 'm'},
920 {"symlink", no_argument, NULL, 'y'}, 1922 {"symlink", no_argument, NULL, 'y'},
1923 {"archives", no_argument, NULL, 'A'},
1924 {"ldcache", no_argument, NULL, 'L'},
1925 {"fix", no_argument, NULL, 'X'},
1926 {"setpax", a_argument, NULL, 'z'},
921 {"pax", no_argument, NULL, 'x'}, 1927 {"pax", no_argument, NULL, 'x'},
922 {"header", no_argument, NULL, 'e'}, 1928 {"header", no_argument, NULL, 'e'},
923 {"textrel", no_argument, NULL, 't'}, 1929 {"textrel", no_argument, NULL, 't'},
924 {"rpath", no_argument, NULL, 'r'}, 1930 {"rpath", no_argument, NULL, 'r'},
925 {"needed", no_argument, NULL, 'n'}, 1931 {"needed", no_argument, NULL, 'n'},
926 {"interp", no_argument, NULL, 'i'}, 1932 {"interp", no_argument, NULL, 'i'},
927 {"bind", no_argument, NULL, 'b'}, 1933 {"bind", no_argument, NULL, 'b'},
1934 {"soname", no_argument, NULL, 'S'},
928 {"symbol", a_argument, NULL, 's'}, 1935 {"symbol", a_argument, NULL, 's'},
1936 {"section", a_argument, NULL, 'k'},
929 {"lib", a_argument, NULL, 'N'}, 1937 {"lib", a_argument, NULL, 'N'},
1938 {"gmatch", no_argument, NULL, 'g'},
930 {"textrels", no_argument, NULL, 'T'}, 1939 {"textrels", no_argument, NULL, 'T'},
1940 {"etype", a_argument, NULL, 'E'},
1941 {"bits", a_argument, NULL, 'M'},
1942 {"endian", no_argument, NULL, 'D'},
1943 {"osabi", no_argument, NULL, 'I'},
1944 {"eabi", no_argument, NULL, 'Y'},
1945 {"perms", a_argument, NULL, 'O'},
1946 {"size", no_argument, NULL, 'Z'},
931 {"all", no_argument, NULL, 'a'}, 1947 {"all", no_argument, NULL, 'a'},
932 {"quiet", no_argument, NULL, 'q'}, 1948 {"quiet", no_argument, NULL, 'q'},
933 {"verbose", no_argument, NULL, 'v'}, 1949 {"verbose", no_argument, NULL, 'v'},
934 {"format", a_argument, NULL, 'F'}, 1950 {"format", a_argument, NULL, 'F'},
935 {"from", a_argument, NULL, 'f'}, 1951 {"from", a_argument, NULL, 'f'},
936 {"file", a_argument, NULL, 'o'}, 1952 {"file", a_argument, NULL, 'o'},
1953 {"nocolor", no_argument, NULL, 'C'},
937 {"nobanner", no_argument, NULL, 'B'}, 1954 {"nobanner", no_argument, NULL, 'B'},
938 {"help", no_argument, NULL, 'h'}, 1955 {"help", no_argument, NULL, 'h'},
939 {"version", no_argument, NULL, 'V'}, 1956 {"version", no_argument, NULL, 'V'},
940 {NULL, no_argument, NULL, 0x0} 1957 {NULL, no_argument, NULL, 0x0}
941}; 1958};
942 1959
943static const char *opts_help[] = { 1960static const char * const opts_help[] = {
944 "Scan all directories in PATH environment", 1961 "Scan all directories in PATH environment",
945 "Scan all directories in /etc/ld.so.conf", 1962 "Scan all directories in /etc/ld.so.conf",
1963 "Root directory (use with -l or -p)",
946 "Scan directories recursively", 1964 "Scan directories recursively",
947 "Don't recursively cross mount points", 1965 "Don't recursively cross mount points",
948 "Don't scan symlinks\n", 1966 "Don't scan symlinks",
1967 "Scan archives (.a files)",
1968 "Utilize ld.so.cache to show full path (use with -r/-n)",
1969 "Try and 'fix' bad things (use with -r/-e)",
1970 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
949 "Print PaX markings", 1971 "Print PaX markings",
950 "Print GNU_STACK/PT_LOAD markings", 1972 "Print GNU_STACK/PT_LOAD markings",
951 "Print TEXTREL information", 1973 "Print TEXTREL information",
952 "Print RPATH information", 1974 "Print RPATH information",
953 "Print NEEDED information", 1975 "Print NEEDED information",
954 "Print INTERP information", 1976 "Print INTERP information",
955 "Print BIND information", 1977 "Print BIND information",
1978 "Print SONAME information",
956 "Find a specified symbol", 1979 "Find a specified symbol",
1980 "Find a specified section",
957 "Find a specified library", 1981 "Find a specified library",
1982 "Use regex matching rather than string compare (use with -s)",
958 "Locate cause of TEXTREL", 1983 "Locate cause of TEXTREL",
959 "Print all scanned info (-x -e -t -r -b)\n", 1984 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1985 "Print only ELF files matching numeric bits",
1986 "Print Endianness",
1987 "Print OSABI",
1988 "Print EABI (EM_ARM Only)",
1989 "Print only ELF files matching octal permissions",
1990 "Print ELF file size",
1991 "Print all useful/simple info\n",
960 "Only output 'bad' things", 1992 "Only output 'bad' things",
961 "Be verbose (can be specified more than once)", 1993 "Be verbose (can be specified more than once)",
962 "Use specified format for output", 1994 "Use specified format for output",
963 "Read input stream from a filename", 1995 "Read input stream from a filename",
964 "Write output stream to a filename", 1996 "Write output stream to a filename",
1997 "Don't emit color in output",
965 "Don't display the header", 1998 "Don't display the header",
966 "Print this help and exit", 1999 "Print this help and exit",
967 "Print version and exit", 2000 "Print version and exit",
968 NULL 2001 NULL
969}; 2002};
971/* display usage and exit */ 2004/* display usage and exit */
972static void usage(int status) 2005static void usage(int status)
973{ 2006{
974 unsigned long i; 2007 unsigned long i;
975 printf("* Scan ELF binaries for stuff\n\n" 2008 printf("* Scan ELF binaries for stuff\n\n"
976 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0); 2009 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
977 printf("Options: -[%s]\n", PARSE_FLAGS); 2010 printf("Options: -[%s]\n", PARSE_FLAGS);
978 for (i = 0; long_opts[i].name; ++i) 2011 for (i = 0; long_opts[i].name; ++i)
979 if (long_opts[i].has_arg == no_argument) 2012 if (long_opts[i].has_arg == no_argument)
980 printf(" -%c, --%-13s* %s\n", long_opts[i].val, 2013 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
2014 long_opts[i].name, opts_help[i]);
2015 else if (long_opts[i].val > '~')
2016 printf(" --%-7s <arg> * %s\n",
981 long_opts[i].name, opts_help[i]); 2017 long_opts[i].name, opts_help[i]);
982 else 2018 else
983 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val, 2019 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
984 long_opts[i].name, opts_help[i]); 2020 long_opts[i].name, opts_help[i]);
985 2021
986 if (status != EXIT_SUCCESS) 2022 puts("\nFor more information, see the scanelf(1) manpage");
987 exit(status);
988
989 puts("\nThe format modifiers for the -F option are:");
990 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
991 puts(" t TEXTREL \tr RPATH \tn NEEDED");
992 puts(" i INTERP \tb BIND \ts symbol");
993 puts(" N library \to Type \tT TEXTRELs");
994 puts(" p filename (with search path removed)");
995 puts(" f base filename");
996 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
997
998 exit(status); 2023 exit(status);
999} 2024}
1000 2025
1001/* parse command line arguments and preform needed actions */ 2026/* parse command line arguments and preform needed actions */
2027#define do_pax_state(option, flag) \
2028 if (islower(option)) { \
2029 flags &= ~PF_##flag; \
2030 flags |= PF_NO##flag; \
2031 } else { \
2032 flags &= ~PF_NO##flag; \
2033 flags |= PF_##flag; \
2034 }
1002static void parseargs(int argc, char *argv[]) 2035static int parseargs(int argc, char *argv[])
1003{ 2036{
1004 int i; 2037 int i;
1005 char *from_file = NULL; 2038 const char *from_file = NULL;
2039 int ret = 0;
1006 2040
1007 opterr = 0; 2041 opterr = 0;
1008 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 2042 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1009 switch (i) { 2043 switch (i) {
1010 2044
1014 VERSION, __FILE__, __DATE__, rcsid, argv0); 2048 VERSION, __FILE__, __DATE__, rcsid, argv0);
1015 exit(EXIT_SUCCESS); 2049 exit(EXIT_SUCCESS);
1016 break; 2050 break;
1017 case 'h': usage(EXIT_SUCCESS); break; 2051 case 'h': usage(EXIT_SUCCESS); break;
1018 case 'f': 2052 case 'f':
1019 if (from_file) err("Don't specify -f twice"); 2053 if (from_file) warn("You prob don't want to specify -f twice");
1020 from_file = xstrdup(optarg); 2054 from_file = optarg;
2055 break;
2056 case 'E':
2057 match_etypes = optarg;
2058 break;
2059 case 'M':
2060 match_bits = atoi(optarg);
2061 if (match_bits == 0) {
2062 if (strcmp(optarg, "ELFCLASS32") == 0)
2063 match_bits = 32;
2064 if (strcmp(optarg, "ELFCLASS64") == 0)
2065 match_bits = 64;
2066 }
2067 break;
2068 case 'O':
2069 if (sscanf(optarg, "%o", &match_perms) == -1)
2070 match_bits = 0;
1021 break; 2071 break;
1022 case 'o': { 2072 case 'o': {
1023 FILE *fp = NULL;
1024 if ((fp = freopen(optarg, "w", stdout)) == NULL) 2073 if (freopen(optarg, "w", stdout) == NULL)
1025 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 2074 errp("Could not freopen(%s)", optarg);
1026 SET_STDOUT(fp);
1027 break; 2075 break;
1028 } 2076 }
1029 2077 case 'k':
2078 xarraypush_str(find_section_arr, optarg);
2079 break;
1030 case 's': { 2080 case 's': {
1031 size_t len;
1032 if (find_sym) err("Don't specify -s twice"); 2081 if (find_sym) warn("You prob don't want to specify -s twice");
1033 find_sym = xstrdup(optarg); 2082 find_sym = optarg;
1034 len = strlen(find_sym) + 1;
1035 versioned_symname = (char*)xmalloc(sizeof(char) * (len+1));
1036 sprintf(versioned_symname, "%s@", find_sym);
1037 break; 2083 break;
1038 } 2084 }
1039 case 'N': { 2085 case 'N':
1040 if (find_lib) err("Don't specify -N twice"); 2086 xarraypush_str(find_lib_arr, optarg);
1041 find_lib = xstrdup(optarg);
1042 break; 2087 break;
1043 }
1044
1045 case 'F': { 2088 case 'F': {
1046 if (out_format) err("Don't specify -F twice"); 2089 if (out_format) warn("You prob don't want to specify -F twice");
1047 out_format = xstrdup(optarg); 2090 out_format = optarg;
1048 break; 2091 break;
1049 } 2092 }
2093 case 'z': {
2094 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
2095 size_t x;
1050 2096
2097 for (x = 0; x < strlen(optarg); x++) {
2098 switch (optarg[x]) {
2099 case 'p':
2100 case 'P':
2101 do_pax_state(optarg[x], PAGEEXEC);
2102 break;
2103 case 's':
2104 case 'S':
2105 do_pax_state(optarg[x], SEGMEXEC);
2106 break;
2107 case 'm':
2108 case 'M':
2109 do_pax_state(optarg[x], MPROTECT);
2110 break;
2111 case 'e':
2112 case 'E':
2113 do_pax_state(optarg[x], EMUTRAMP);
2114 break;
2115 case 'r':
2116 case 'R':
2117 do_pax_state(optarg[x], RANDMMAP);
2118 break;
2119 case 'x':
2120 case 'X':
2121 do_pax_state(optarg[x], RANDEXEC);
2122 break;
2123 default:
2124 break;
2125 }
2126 }
2127 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
2128 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
2129 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
2130 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
2131 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
2132 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
2133 setpax = flags;
2134 break;
2135 }
2136 case 'Z': show_size = 1; break;
2137 case 'g': g_match = 1; break;
2138 case 'L': use_ldcache = 1; break;
1051 case 'y': scan_symlink = 0; break; 2139 case 'y': scan_symlink = 0; break;
2140 case 'A': scan_archives = 1; break;
2141 case 'C': color_init(true); break;
1052 case 'B': show_banner = 0; break; 2142 case 'B': show_banner = 0; break;
1053 case 'l': scan_ldpath = 1; break; 2143 case 'l': scan_ldpath = 1; break;
1054 case 'p': scan_envpath = 1; break; 2144 case 'p': scan_envpath = 1; break;
1055 case 'R': dir_recurse = 1; break; 2145 case 'R': dir_recurse = 1; break;
1056 case 'm': dir_crossmount = 0; break; 2146 case 'm': dir_crossmount = 0; break;
2147 case 'X': ++fix_elf; break;
1057 case 'x': show_pax = 1; break; 2148 case 'x': show_pax = 1; break;
1058 case 'e': show_phdr = 1; break; 2149 case 'e': show_phdr = 1; break;
1059 case 't': show_textrel = 1; break; 2150 case 't': show_textrel = 1; break;
1060 case 'r': show_rpath = 1; break; 2151 case 'r': show_rpath = 1; break;
1061 case 'n': show_needed = 1; break; 2152 case 'n': show_needed = 1; break;
1062 case 'i': show_interp = 1; break; 2153 case 'i': show_interp = 1; break;
1063 case 'b': show_bind = 1; break; 2154 case 'b': show_bind = 1; break;
2155 case 'S': show_soname = 1; break;
1064 case 'T': show_textrels = 1; break; 2156 case 'T': show_textrels = 1; break;
1065 case 'q': be_quiet = 1; break; 2157 case 'q': be_quiet = 1; break;
1066 case 'v': be_verbose = (be_verbose % 20) + 1; break; 2158 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1067 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break; 2159 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
1068 2160 case 'D': show_endian = 1; break;
2161 case 'I': show_osabi = 1; break;
2162 case 'Y': show_eabi = 1; break;
2163 case 128:
2164 root_fd = open(optarg, O_RDONLY|O_CLOEXEC);
2165 if (root_fd == -1)
2166 err("Could not open root: %s", optarg);
2167 break;
1069 case ':': 2168 case ':':
1070 err("Option missing parameter\n"); 2169 err("Option '%c' is missing parameter", optopt);
1071 case '?': 2170 case '?':
1072 err("Unknown option\n"); 2171 err("Unknown option '%c' or argument missing", optopt);
1073 default: 2172 default:
1074 err("Unhandled option '%c'", i); 2173 err("Unhandled option '%c'; please report this", i);
1075 }
1076 } 2174 }
1077 2175 }
2176 if (show_textrels && be_verbose)
2177 has_objdump = bin_in_path("objdump");
2178 /* flatten arrays for display */
2179 if (array_cnt(find_lib_arr))
2180 find_lib = array_flatten_str(find_lib_arr);
2181 if (array_cnt(find_section_arr))
2182 find_section = array_flatten_str(find_section_arr);
1078 /* let the format option override all other options */ 2183 /* let the format option override all other options */
1079 if (out_format) { 2184 if (out_format) {
1080 show_pax = show_phdr = show_textrel = show_rpath = \ 2185 show_pax = show_phdr = show_textrel = show_rpath = \
1081 show_needed = show_interp = show_bind = show_textrels = 0; 2186 show_needed = show_interp = show_bind = show_soname = \
2187 show_textrels = show_perms = show_endian = show_size = \
2188 show_osabi = show_eabi = 0;
1082 for (i = 0; out_format[i]; ++i) { 2189 for (i = 0; out_format[i]; ++i) {
1083 if (!IS_MODIFIER(out_format[i])) continue; 2190 if (!IS_MODIFIER(out_format[i])) continue;
1084 2191
1085 switch (out_format[++i]) { 2192 switch (out_format[++i]) {
2193 case '+': break;
1086 case '%': break; 2194 case '%': break;
1087 case '#': break; 2195 case '#': break;
1088 case 'F': break; 2196 case 'F': break;
1089 case 'p': break; 2197 case 'p': break;
1090 case 'f': break; 2198 case 'f': break;
2199 case 'k': break;
1091 case 's': break; 2200 case 's': break;
1092 case 'N': break; 2201 case 'N': break;
1093 case 'o': break; 2202 case 'o': break;
2203 case 'a': break;
2204 case 'M': break;
2205 case 'Z': show_size = 1; break;
2206 case 'D': show_endian = 1; break;
2207 case 'I': show_osabi = 1; break;
2208 case 'Y': show_eabi = 1; break;
2209 case 'O': show_perms = 1; break;
1094 case 'x': show_pax = 1; break; 2210 case 'x': show_pax = 1; break;
1095 case 'e': show_phdr = 1; break; 2211 case 'e': show_phdr = 1; break;
1096 case 't': show_textrel = 1; break; 2212 case 't': show_textrel = 1; break;
1097 case 'r': show_rpath = 1; break; 2213 case 'r': show_rpath = 1; break;
1098 case 'n': show_needed = 1; break; 2214 case 'n': show_needed = 1; break;
1099 case 'i': show_interp = 1; break; 2215 case 'i': show_interp = 1; break;
1100 case 'b': show_bind = 1; break; 2216 case 'b': show_bind = 1; break;
2217 case 'S': show_soname = 1; break;
1101 case 'T': show_textrels = 1; break; 2218 case 'T': show_textrels = 1; break;
1102 default: 2219 default:
1103 err("Invalid format specifier '%c' (byte %i)", 2220 err("Invalid format specifier '%c' (byte %i)",
1104 out_format[i], i+1); 2221 out_format[i], i+1);
1105 } 2222 }
1106 } 2223 }
1107 2224
1108 /* construct our default format */ 2225 /* construct our default format */
1109 } else { 2226 } else {
1110 size_t fmt_len = 30; 2227 size_t fmt_len = 30;
1111 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 2228 out_format = xmalloc(sizeof(char) * fmt_len);
2229 *out_format = '\0';
1112 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 2230 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1113 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len); 2231 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
2232 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
2233 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
2234 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
2235 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
2236 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
1114 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len); 2237 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1115 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 2238 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1116 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 2239 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1117 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 2240 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1118 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 2241 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1119 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len); 2242 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
2243 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1120 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len); 2244 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1121 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len); 2245 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
2246 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1122 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len); 2247 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1123 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 2248 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1124 } 2249 }
1125 if (be_verbose > 2) printf("Format: %s\n", out_format); 2250 if (be_verbose > 2) printf("Format: %s\n", out_format);
1126 2251
1127 /* now lets actually do the scanning */ 2252 /* now lets actually do the scanning */
1128 if (scan_ldpath || (show_rpath && be_quiet)) 2253 if (scan_ldpath || use_ldcache)
1129 load_ld_so_conf(); 2254 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
1130 if (scan_ldpath) scanelf_ldpath(); 2255 if (scan_ldpath) scanelf_ldpath();
1131 if (scan_envpath) scanelf_envpath(); 2256 if (scan_envpath) scanelf_envpath();
2257 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
2258 from_file = "-";
1132 if (from_file) { 2259 if (from_file) {
1133 scanelf_from_file(from_file); 2260 scanelf_from_file(from_file);
1134 free(from_file);
1135 from_file = *argv; 2261 from_file = *argv;
1136 } 2262 }
1137 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file) 2263 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1138 err("Nothing to scan !?"); 2264 err("Nothing to scan !?");
1139 while (optind < argc) { 2265 while (optind < argc) {
1140 search_path = argv[optind++]; 2266 search_path = argv[optind++];
1141 scanelf_dir(search_path); 2267 ret = scanelf_dir(search_path);
1142 } 2268 }
1143 2269
1144 /* clean up */ 2270 /* clean up */
1145 if (find_sym) { 2271 xarrayfree(ldpaths);
2272 xarrayfree(find_lib_arr);
2273 xarrayfree(find_section_arr);
1146 free(find_sym); 2274 free(find_lib);
1147 free(versioned_symname); 2275 free(find_section);
1148 }
1149 if (find_lib) free(find_lib);
1150 if (out_format) free(out_format);
1151 for (i = 0; ldpaths[i]; ++i)
1152 free(ldpaths[i]);
1153}
1154 2276
1155 2277 if (ldcache != 0)
1156 2278 munmap(ldcache, ldcache_size);
1157/* utility funcs */
1158static char *xstrdup(const char *s)
1159{
1160 char *ret = strdup(s);
1161 if (!ret) err("Could not strdup(): %s", strerror(errno));
1162 return ret; 2279 return ret;
1163} 2280}
1164 2281
1165static void *xmalloc(size_t size) 2282static char **get_split_env(const char *envvar)
1166{ 2283{
1167 void *ret = malloc(size); 2284 const char *delims = " \t\n";
1168 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size); 2285 char **envvals = NULL;
1169 return ret; 2286 char *env, *s;
1170} 2287 int nentry;
1171 2288
1172static void xstrcat(char **dst, const char *src, size_t *curr_len) 2289 if ((env = getenv(envvar)) == NULL)
1173{ 2290 return NULL;
1174 size_t new_len;
1175 2291
1176 new_len = strlen(*dst) + strlen(src); 2292 env = xstrdup(env);
1177 if (*curr_len <= new_len) { 2293 if (env == NULL)
1178 *curr_len = new_len + (*curr_len / 2); 2294 return NULL;
1179 *dst = realloc(*dst, *curr_len);
1180 if (!*dst)
1181 err("could not realloc %li bytes", (unsigned long)*curr_len);
1182 }
1183 2295
1184 strcat(*dst, src); 2296 s = strtok(env, delims);
1185} 2297 if (s == NULL) {
2298 free(env);
2299 return NULL;
2300 }
1186 2301
1187static inline void xchrcat(char **dst, const char append, size_t *curr_len) 2302 nentry = 0;
1188{ 2303 while (s != NULL) {
1189 static char my_app[2]; 2304 ++nentry;
1190 my_app[0] = append; 2305 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
1191 my_app[1] = '\0'; 2306 envvals[nentry-1] = s;
1192 xstrcat(dst, my_app, curr_len); 2307 s = strtok(NULL, delims);
1193} 2308 }
2309 envvals[nentry] = NULL;
1194 2310
2311 /* don't want to free(env) as it contains the memory that backs
2312 * the envvals array of strings */
2313 return envvals;
2314}
1195 2315
2316static void parseenv(void)
2317{
2318 color_init(false);
2319 qa_textrels = get_split_env("QA_TEXTRELS");
2320 qa_execstack = get_split_env("QA_EXECSTACK");
2321 qa_wx_load = get_split_env("QA_WX_LOAD");
2322}
2323
2324#ifdef __PAX_UTILS_CLEANUP
2325static void cleanup(void)
2326{
2327 free(out_format);
2328 free(qa_textrels);
2329 free(qa_execstack);
2330 free(qa_wx_load);
2331}
2332#endif
1196 2333
1197int main(int argc, char *argv[]) 2334int main(int argc, char *argv[])
1198{ 2335{
2336 int ret;
1199 if (argc < 2) 2337 if (argc < 2)
1200 usage(EXIT_FAILURE); 2338 usage(EXIT_FAILURE);
2339 parseenv();
1201 parseargs(argc, argv); 2340 ret = parseargs(argc, argv);
1202 fclose(stdout); 2341 fclose(stdout);
1203#ifdef __BOUNDS_CHECKING_ON 2342#ifdef __PAX_UTILS_CLEANUP
1204 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()"); 2343 cleanup();
2344 warn("The calls to add/delete heap should be off:\n"
2345 "\t- 1 due to the out_buffer not being freed in scanelf_fileat()\n"
2346 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
1205#endif 2347#endif
1206 return EXIT_SUCCESS; 2348 return ret;
1207} 2349}
2350
2351/* Match filename against entries in matchlist, return TRUE
2352 * if the file is listed */
2353static int file_matches_list(const char *filename, char **matchlist)
2354{
2355 char **file;
2356 char *match;
2357 char buf[__PAX_UTILS_PATH_MAX];
2358
2359 if (matchlist == NULL)
2360 return 0;
2361
2362 for (file = matchlist; *file != NULL; file++) {
2363 if (search_path) {
2364 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2365 match = buf;
2366 } else {
2367 match = *file;
2368 }
2369 if (fnmatch(match, filename, 0) == 0)
2370 return 1;
2371 }
2372 return 0;
2373}

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