/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.96 Revision 1.255
1/* 1/*
2 * Copyright 2003-2005 Gentoo Foundation 2 * Copyright 2003-2012 Gentoo Foundation
3 * Distributed under the terms of the GNU General Public License v2 3 * Distributed under the terms of the GNU General Public License v2
4 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.96 2005/12/28 22:26:47 solar Exp $ 4 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.255 2013/04/02 21:15:50 vapier Exp $
5 * 5 *
6 * Copyright 2003-2005 Ned Ludd - <solar@gentoo.org> 6 * Copyright 2003-2012 Ned Ludd - <solar@gentoo.org>
7 * Copyright 2004-2005 Mike Frysinger - <vapier@gentoo.org> 7 * Copyright 2004-2012 Mike Frysinger - <vapier@gentoo.org>
8 */ 8 */
9 9
10#include <stdio.h> 10static const char rcsid[] = "$Id: scanelf.c,v 1.255 2013/04/02 21:15:50 vapier Exp $";
11#include <stdlib.h> 11const char argv0[] = "scanelf";
12#include <sys/types.h> 12
13#include <libgen.h>
14#include <limits.h>
15#include <string.h>
16#include <errno.h>
17#include <unistd.h>
18#include <sys/stat.h>
19#include <sys/mman.h>
20#include <fcntl.h>
21#include <dirent.h>
22#include <getopt.h>
23#include <assert.h>
24#include "paxinc.h" 13#include "paxinc.h"
25 14
26static const char *rcsid = "$Id: scanelf.c,v 1.96 2005/12/28 22:26:47 solar Exp $";
27#define argv0 "scanelf"
28
29#define IS_MODIFIER(c) (c == '%' || c == '#') 15#define IS_MODIFIER(c) (c == '%' || c == '#' || c == '+')
30
31
32 16
33/* prototypes */ 17/* prototypes */
34static void scanelf_file(const char *filename); 18static int file_matches_list(const char *filename, char **matchlist);
35static void scanelf_dir(const char *path);
36static void scanelf_ldpath();
37static void scanelf_envpath();
38static void usage(int status);
39static void parseargs(int argc, char *argv[]);
40static char *xstrdup(const char *s);
41static void *xmalloc(size_t size);
42static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n);
43#define xstrcat(dst,src,curr_len) xstrncat(dst,src,curr_len,0)
44static inline void xchrcat(char **dst, const char append, size_t *curr_len);
45 19
46/* variables to control behavior */ 20/* variables to control behavior */
47static char *ldpaths[256]; 21static char *match_etypes = NULL;
22static array_t _ldpaths = array_init_decl, *ldpaths = &_ldpaths;
48static char scan_ldpath = 0; 23static char scan_ldpath = 0;
49static char scan_envpath = 0; 24static char scan_envpath = 0;
50static char scan_symlink = 1; 25static char scan_symlink = 1;
26static char scan_archives = 0;
51static char dir_recurse = 0; 27static char dir_recurse = 0;
52static char dir_crossmount = 1; 28static char dir_crossmount = 1;
53static char show_pax = 0; 29static char show_pax = 0;
30static char show_perms = 0;
31static char show_size = 0;
54static char show_phdr = 0; 32static char show_phdr = 0;
55static char show_textrel = 0; 33static char show_textrel = 0;
56static char show_rpath = 0; 34static char show_rpath = 0;
57static char show_needed = 0; 35static char show_needed = 0;
58static char show_interp = 0; 36static char show_interp = 0;
59static char show_bind = 0; 37static char show_bind = 0;
60static char show_soname = 0; 38static char show_soname = 0;
61static char show_textrels = 0; 39static char show_textrels = 0;
62static char show_banner = 1; 40static char show_banner = 1;
41static char show_endian = 0;
42static char show_osabi = 0;
43static char show_eabi = 0;
63static char be_quiet = 0; 44static char be_quiet = 0;
64static char be_verbose = 0; 45static char be_verbose = 0;
65static char be_wewy_wewy_quiet = 0; 46static char be_wewy_wewy_quiet = 0;
66static char *find_sym = NULL, *versioned_symname = NULL; 47static char be_semi_verbose = 0;
48static char *find_sym = NULL;
49static array_t _find_sym_arr = array_init_decl, *find_sym_arr = &_find_sym_arr;
50static array_t _find_sym_regex_arr = array_init_decl, *find_sym_regex_arr = &_find_sym_regex_arr;
67static char *find_lib = NULL; 51static char *find_lib = NULL;
52static array_t _find_lib_arr = array_init_decl, *find_lib_arr = &_find_lib_arr;
53static char *find_section = NULL;
54static array_t _find_section_arr = array_init_decl, *find_section_arr = &_find_section_arr;
68static char *out_format = NULL; 55static char *out_format = NULL;
69static char *search_path = NULL; 56static char *search_path = NULL;
57static char fix_elf = 0;
70static char gmatch = 0; 58static char g_match = 0;
71static char printcache = 0; 59static char use_ldcache = 0;
60static char use_ldpath = 0;
72 61
62static char **qa_textrels = NULL;
63static char **qa_execstack = NULL;
64static char **qa_wx_load = NULL;
65static int root_fd = AT_FDCWD;
73 66
74caddr_t ldcache = 0; 67static int match_bits = 0;
68static unsigned int match_perms = 0;
69static void *ldcache = NULL;
75size_t ldcache_size = 0; 70static size_t ldcache_size = 0;
71static unsigned long setpax = 0UL;
76 72
73static int has_objdump = 0;
74
75/* find the path to a file by name */
76static int bin_in_path(const char *fname)
77{
78 char fullpath[__PAX_UTILS_PATH_MAX];
79 char *path, *p;
80
81 path = getenv("PATH");
82 if (!path)
83 return 0;
84
85 while ((p = strrchr(path, ':')) != NULL) {
86 snprintf(fullpath, sizeof(fullpath), "%s/%s", p + 1, fname);
87 *p = 0;
88 if (access(fullpath, R_OK) != -1)
89 return 1;
90 }
91
92 return 0;
93}
94
95static FILE *fopenat_r(int dir_fd, const char *path)
96{
97 int fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
98 if (fd == -1)
99 return NULL;
100 return fdopen(fd, "re");
101}
102
103static const char *root_rel_path(const char *path)
104{
105 /*
106 * openat() will ignore the dirfd if path starts with
107 * a /, so consume all of that noise
108 *
109 * XXX: we don't handle relative paths like ../ that
110 * break out of the --root option, but for now, just
111 * don't do that :P.
112 */
113 if (root_fd != AT_FDCWD) {
114 while (*path == '/')
115 ++path;
116 if (*path == '\0')
117 path = ".";
118 }
119
120 return path;
121}
122
77/* sub-funcs for scanelf_file() */ 123/* sub-funcs for scanelf_fileat() */
78static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab) 124static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **str)
79{ 125{
80 /* find the best SHT_DYNSYM and SHT_STRTAB sections */ 126 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
127
128 /* debug sections */
129 void *symtab = elf_findsecbyname(elf, ".symtab");
130 void *strtab = elf_findsecbyname(elf, ".strtab");
131 /* runtime sections */
132 void *dynsym = elf_findsecbyname(elf, ".dynsym");
133 void *dynstr = elf_findsecbyname(elf, ".dynstr");
134
135 /*
136 * If the sections are marked NOBITS, then they don't exist, so we just
137 * skip them. This let's us work sanely with splitdebug ELFs (rather
138 * than spewing a lot of "corrupt ELF" messages later on). In malformed
139 * ELFs, the section might be wrongly set to NOBITS, but screw em.
140 */
81#define GET_SYMTABS(B) \ 141#define GET_SYMTABS(B) \
82 if (elf->elf_class == ELFCLASS ## B) { \ 142 if (elf->elf_class == ELFCLASS ## B) { \
83 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \ 143 Elf ## B ## _Shdr *esymtab = symtab; \
84 /* debug sections */ \ 144 Elf ## B ## _Shdr *estrtab = strtab; \
85 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \ 145 Elf ## B ## _Shdr *edynsym = dynsym; \
86 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \ 146 Elf ## B ## _Shdr *edynstr = dynstr; \
87 /* runtime sections */ \ 147 \
88 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \ 148 if (symtab && EGET(esymtab->sh_type) == SHT_NOBITS) \
89 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \ 149 symtab = NULL; \
150 if (dynsym && EGET(edynsym->sh_type) == SHT_NOBITS) \
151 dynsym = NULL; \
90 if (symtab && dynsym) { \ 152 if (symtab && dynsym) \
91 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \ 153 *sym = (EGET(esymtab->sh_size) > EGET(edynsym->sh_size)) ? symtab : dynsym; \
92 } else { \ 154 else \
93 *sym = (void*)(symtab ? symtab : dynsym); \ 155 *sym = symtab ? symtab : dynsym; \
94 } \ 156 \
157 if (strtab && EGET(estrtab->sh_type) == SHT_NOBITS) \
158 strtab = NULL; \
159 if (dynstr && EGET(edynstr->sh_type) == SHT_NOBITS) \
160 dynstr = NULL; \
95 if (strtab && dynstr) { \ 161 if (strtab && dynstr) \
96 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \ 162 *str = (EGET(estrtab->sh_size) > EGET(edynstr->sh_size)) ? strtab : dynstr; \
97 } else { \ 163 else \
98 *tab = (void*)(strtab ? strtab : dynstr); \ 164 *str = strtab ? strtab : dynstr; \
99 } \
100 } 165 }
101 GET_SYMTABS(32) 166 GET_SYMTABS(32)
102 GET_SYMTABS(64) 167 GET_SYMTABS(64)
168
169 if (*sym && *str)
170 return;
171
172 /*
173 * damn, they're really going to make us work for it huh?
174 * reconstruct the section header info out of the dynamic
175 * tags so we can see what symbols this guy uses at runtime.
176 */
177#define GET_SYMTABS_DT(B) \
178 if (elf->elf_class == ELFCLASS ## B) { \
179 size_t i; \
180 static Elf ## B ## _Shdr sym_shdr, str_shdr; \
181 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
182 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
183 Elf ## B ## _Addr vsym, vstr, vhash, vgnu_hash; \
184 Elf ## B ## _Dyn *dyn; \
185 Elf ## B ## _Off offset; \
186 \
187 /* lookup symbols used at runtime with DT_SYMTAB / DT_STRTAB */ \
188 vsym = vstr = vhash = vgnu_hash = 0; \
189 memset(&sym_shdr, 0, sizeof(sym_shdr)); \
190 memset(&str_shdr, 0, sizeof(str_shdr)); \
191 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
192 if (EGET(phdr[i].p_type) != PT_DYNAMIC) \
193 continue; \
194 \
195 offset = EGET(phdr[i].p_offset); \
196 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
197 continue; \
198 \
199 dyn = DYN ## B (elf->vdata + offset); \
200 while (EGET(dyn->d_tag) != DT_NULL) { \
201 switch (EGET(dyn->d_tag)) { \
202 case DT_SYMTAB: vsym = EGET(dyn->d_un.d_val); break; \
203 case DT_SYMENT: sym_shdr.sh_entsize = dyn->d_un.d_val; break; \
204 case DT_STRTAB: vstr = EGET(dyn->d_un.d_val); break; \
205 case DT_STRSZ: str_shdr.sh_size = dyn->d_un.d_val; break; \
206 case DT_HASH: vhash = EGET(dyn->d_un.d_val); break; \
207 /*case DT_GNU_HASH: vgnu_hash = EGET(dyn->d_un.d_val); break;*/ \
208 } \
209 ++dyn; \
210 } \
211 if (vsym && vstr) \
212 break; \
213 } \
214 if (!vsym || !vstr || !(vhash || vgnu_hash)) \
215 return; \
216 \
217 /* calc offset into the ELF by finding the load addr of the syms */ \
218 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
219 Elf ## B ## _Addr vaddr = EGET(phdr[i].p_vaddr); \
220 Elf ## B ## _Addr filesz = EGET(phdr[i].p_filesz); \
221 offset = EGET(phdr[i].p_offset); \
222 \
223 if (EGET(phdr[i].p_type) != PT_LOAD) \
224 continue; \
225 \
226 if (vhash >= vaddr && vhash < vaddr + filesz) { \
227 /* Scan the hash table to see how many entries we have */ \
228 Elf32_Word max_sym_idx = 0; \
229 Elf32_Word *hashtbl = elf->vdata + offset + (vhash - vaddr); \
230 Elf32_Word b, nbuckets = EGET(hashtbl[0]); \
231 Elf32_Word nchains = EGET(hashtbl[1]); \
232 Elf32_Word *buckets = &hashtbl[2]; \
233 Elf32_Word *chains = &buckets[nbuckets]; \
234 Elf32_Word sym_idx; \
235 \
236 for (b = 0; b < nbuckets; ++b) { \
237 if (!buckets[b]) \
238 continue; \
239 for (sym_idx = buckets[b]; sym_idx < nchains && sym_idx; sym_idx = chains[sym_idx]) \
240 if (max_sym_idx < sym_idx) \
241 max_sym_idx = sym_idx; \
242 } \
243 ESET(sym_shdr.sh_size, sym_shdr.sh_entsize * max_sym_idx); \
244 } \
245 \
246 if (vsym >= vaddr && vsym < vaddr + filesz) { \
247 ESET(sym_shdr.sh_offset, offset + (vsym - vaddr)); \
248 *sym = &sym_shdr; \
249 } \
250 \
251 if (vstr >= vaddr && vstr < vaddr + filesz) { \
252 ESET(str_shdr.sh_offset, offset + (vstr - vaddr)); \
253 *str = &str_shdr; \
254 } \
255 } \
256 }
257 GET_SYMTABS_DT(32)
258 GET_SYMTABS_DT(64)
103} 259}
260
104static char *scanelf_file_pax(elfobj *elf, char *found_pax) 261static char *scanelf_file_pax(elfobj *elf, char *found_pax)
105{ 262{
106 static char ret[7]; 263 static char ret[7];
107 unsigned long i, shown; 264 unsigned long i, shown;
108 265
117 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 274 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
118 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 275 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
119 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 276 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
120 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \ 277 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
121 continue; \ 278 continue; \
122 if (be_quiet && (EGET(phdr[i].p_flags) == 10240)) \ 279 if (fix_elf && setpax) { \
280 /* set the paxctl flags */ \
281 ESET(phdr[i].p_flags, setpax); \
282 } \
283 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
123 continue; \ 284 continue; \
124 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \ 285 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
125 *found_pax = 1; \ 286 *found_pax = 1; \
126 ++shown; \ 287 ++shown; \
127 break; \ 288 break; \
128 } \ 289 } \
129 } 290 }
130 SHOW_PAX(32) 291 SHOW_PAX(32)
131 SHOW_PAX(64) 292 SHOW_PAX(64)
132 } 293 }
294
295 /* Note: We do not support setting EI_PAX if not PT_PAX_FLAGS
296 * was found. This is known to break ELFs on glibc systems,
297 * and mainline PaX has deprecated use of this for a long time.
298 * We could support changing PT_GNU_STACK, but that doesn't
299 * seem like it's worth the effort. #411919
300 */
133 301
134 /* fall back to EI_PAX if no PT_PAX was found */ 302 /* fall back to EI_PAX if no PT_PAX was found */
135 if (!*ret) { 303 if (!*ret) {
136 static char *paxflags; 304 static char *paxflags;
137 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf)); 305 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
150 318
151static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load) 319static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
152{ 320{
153 static char ret[12]; 321 static char ret[12];
154 char *found; 322 char *found;
155 unsigned long i, shown;
156 unsigned char multi_stack, multi_relro, multi_load; 323 unsigned long i, shown, multi_stack, multi_relro, multi_load;
157 324
158 if (!show_phdr) return NULL; 325 if (!show_phdr) return NULL;
159 326
160 memcpy(ret, "--- --- ---\0", 12); 327 memcpy(ret, "--- --- ---\0", 12);
161 328
162 shown = 0; 329 shown = 0;
163 multi_stack = multi_relro = multi_load = 0; 330 multi_stack = multi_relro = multi_load = 0;
164 331
332#define NOTE_GNU_STACK ".note.GNU-stack"
165#define SHOW_PHDR(B) \ 333#define SHOW_PHDR(B) \
166 if (elf->elf_class == ELFCLASS ## B) { \ 334 if (elf->elf_class == ELFCLASS ## B) { \
167 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 335 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
168 Elf ## B ## _Off offset; \ 336 Elf ## B ## _Off offset; \
169 uint32_t flags, check_flags; \ 337 uint32_t flags, check_flags; \
170 if (elf->phdr != NULL) { \ 338 if (elf->phdr != NULL) { \
171 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 339 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
172 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \ 340 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
173 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \ 341 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
342 if (multi_stack++) \
174 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \ 343 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
344 if (file_matches_list(elf->filename, qa_execstack)) \
345 continue; \
175 found = found_phdr; \ 346 found = found_phdr; \
176 offset = 0; \ 347 offset = 0; \
177 check_flags = PF_X; \ 348 check_flags = PF_X; \
178 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \ 349 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
350 if (multi_relro++) \
179 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \ 351 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
180 found = found_relro; \ 352 found = found_relro; \
181 offset = 4; \ 353 offset = 4; \
182 check_flags = PF_X; \ 354 check_flags = PF_X; \
183 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \ 355 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
184 if (multi_load++ > 2) warnf("%s: more than 2 PT_LOAD's !?", elf->filename); \ 356 if (file_matches_list(elf->filename, qa_wx_load)) \
357 continue; \
185 found = found_load; \ 358 found = found_load; \
186 offset = 8; \ 359 offset = 8; \
187 check_flags = PF_W|PF_X; \ 360 check_flags = PF_W|PF_X; \
188 } else \ 361 } else \
189 continue; \ 362 continue; \
190 flags = EGET(phdr[i].p_flags); \ 363 flags = EGET(phdr[i].p_flags); \
191 if (be_quiet && ((flags & check_flags) != check_flags)) \ 364 if (be_quiet && ((flags & check_flags) != check_flags)) \
192 continue; \ 365 continue; \
366 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
367 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
368 ret[3] = ret[7] = '!'; \
369 flags = EGET(phdr[i].p_flags); \
370 } \
193 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \ 371 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
194 *found = 1; \ 372 *found = 1; \
195 ++shown; \ 373 ++shown; \
196 } \ 374 } \
197 } else if (elf->shdr != NULL) { \ 375 } else if (elf->shdr != NULL) { \
198 /* no program headers which means this is prob an object file */ \ 376 /* no program headers which means this is prob an object file */ \
199 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \ 377 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
200 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \ 378 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
379 char *str; \
380 if ((void*)strtbl > elf->data_end) \
381 goto skip_this_shdr##B; \
201 check_flags = SHF_WRITE|SHF_EXECINSTR; \ 382 check_flags = SHF_WRITE|SHF_EXECINSTR; \
202 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \ 383 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
203 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \ 384 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
204 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \ 385 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
205 if (!strcmp((char*)(elf->data + offset), ".note.GNU-stack")) { \ 386 str = elf->data + offset; \
387 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
388 if (!strcmp(str, NOTE_GNU_STACK)) { \
206 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \ 389 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
207 flags = EGET(shdr[i].sh_flags); \ 390 flags = EGET(shdr[i].sh_flags); \
208 if (be_quiet && ((flags & check_flags) != check_flags)) \ 391 if (be_quiet && ((flags & check_flags) != check_flags)) \
209 continue; \ 392 continue; \
210 ++*found_phdr; \ 393 ++*found_phdr; \
214 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \ 397 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
215 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \ 398 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
216 break; \ 399 break; \
217 } \ 400 } \
218 } \ 401 } \
402 skip_this_shdr##B: \
219 if (!multi_stack) { \ 403 if (!multi_stack) { \
404 if (file_matches_list(elf->filename, qa_execstack)) \
405 return NULL; \
220 *found_phdr = 1; \ 406 *found_phdr = 1; \
221 shown = 1; \ 407 shown = 1; \
222 memcpy(ret, "!WX", 3); \ 408 memcpy(ret, "!WX", 3); \
223 } \ 409 } \
224 } \ 410 } \
229 if (be_wewy_wewy_quiet || (be_quiet && !shown)) 415 if (be_wewy_wewy_quiet || (be_quiet && !shown))
230 return NULL; 416 return NULL;
231 else 417 else
232 return ret; 418 return ret;
233} 419}
420
421/*
422 * See if this ELF contains a DT_TEXTREL tag in any of its
423 * PT_DYNAMIC sections.
424 */
234static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 425static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
235{ 426{
236 static const char *ret = "TEXTREL"; 427 static const char *ret = "TEXTREL";
237 unsigned long i; 428 unsigned long i;
238 429
239 if (!show_textrel && !show_textrels) return NULL; 430 if (!show_textrel && !show_textrels) return NULL;
431
432 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
240 433
241 if (elf->phdr) { 434 if (elf->phdr) {
242#define SHOW_TEXTREL(B) \ 435#define SHOW_TEXTREL(B) \
243 if (elf->elf_class == ELFCLASS ## B) { \ 436 if (elf->elf_class == ELFCLASS ## B) { \
244 Elf ## B ## _Dyn *dyn; \ 437 Elf ## B ## _Dyn *dyn; \
245 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 438 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
246 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 439 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
247 Elf ## B ## _Off offset; \ 440 Elf ## B ## _Off offset; \
248 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 441 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
249 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 442 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
250 offset = EGET(phdr[i].p_offset); \ 443 offset = EGET(phdr[i].p_offset); \
251 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 444 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
252 dyn = DYN ## B (elf->data + offset); \ 445 dyn = DYN ## B (elf->vdata + offset); \
253 while (EGET(dyn->d_tag) != DT_NULL) { \ 446 while (EGET(dyn->d_tag) != DT_NULL) { \
254 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \ 447 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
255 *found_textrel = 1; \ 448 *found_textrel = 1; \
256 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \ 449 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
257 return (be_wewy_wewy_quiet ? NULL : ret); \ 450 return (be_wewy_wewy_quiet ? NULL : ret); \
266 if (be_quiet || be_wewy_wewy_quiet) 459 if (be_quiet || be_wewy_wewy_quiet)
267 return NULL; 460 return NULL;
268 else 461 else
269 return " - "; 462 return " - ";
270} 463}
464
465/*
466 * Scan the .text section to see if there are any relocations in it.
467 * Should rewrite this to check PT_LOAD sections that are marked
468 * Executable rather than the section named '.text'.
469 */
271static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel) 470static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
272{ 471{
273 unsigned long s, r, rmax; 472 unsigned long s, r, rmax;
274 void *symtab_void, *strtab_void, *text_void; 473 void *symtab_void, *strtab_void, *text_void;
275 474
296 Elf ## B ## _Rela *rela; \ 495 Elf ## B ## _Rela *rela; \
297 /* search the section headers for relocations */ \ 496 /* search the section headers for relocations */ \
298 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \ 497 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
299 uint32_t sh_type = EGET(shdr[s].sh_type); \ 498 uint32_t sh_type = EGET(shdr[s].sh_type); \
300 if (sh_type == SHT_REL) { \ 499 if (sh_type == SHT_REL) { \
301 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \ 500 rel = REL ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
302 rela = NULL; \ 501 rela = NULL; \
303 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \ 502 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
304 } else if (sh_type == SHT_RELA) { \ 503 } else if (sh_type == SHT_RELA) { \
305 rel = NULL; \ 504 rel = NULL; \
306 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \ 505 rela = RELA ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
307 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \ 506 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
308 } else \ 507 } else \
309 continue; \ 508 continue; \
310 /* now see if any of the relocs are in the .text */ \ 509 /* now see if any of the relocs are in the .text */ \
311 for (r = 0; r < rmax; ++r) { \ 510 for (r = 0; r < rmax; ++r) { \
326 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \ 525 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
327 if (be_verbose <= 2) continue; \ 526 if (be_verbose <= 2) continue; \
328 } else \ 527 } else \
329 *found_textrels = 1; \ 528 *found_textrels = 1; \
330 /* locate this relocation symbol name */ \ 529 /* locate this relocation symbol name */ \
331 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 530 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
531 if ((void*)sym > elf->data_end) { \
532 warn("%s: corrupt ELF symbol", elf->filename); \
533 continue; \
534 } \
332 sym_max = ELF ## B ## _R_SYM(r_info); \ 535 sym_max = ELF ## B ## _R_SYM(r_info); \
333 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \ 536 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
334 sym += sym_max; \ 537 sym += sym_max; \
335 else \ 538 else \
336 sym = NULL; \ 539 sym = NULL; \
337 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 540 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
338 /* show the raw details about this reloc */ \ 541 /* show the raw details about this reloc */ \
339 printf(" %s: ", elf->base_filename); \ 542 printf(" %s: ", elf->base_filename); \
340 if (sym && sym->st_name) \ 543 if (sym && sym->st_name) \
341 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \ 544 printf("%s", elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
342 else \ 545 else \
343 printf("(memory/fake?)"); \ 546 printf("(memory/data?)"); \
344 printf(" [0x%lX]", (unsigned long)r_offset); \ 547 printf(" [0x%lX]", (unsigned long)r_offset); \
345 /* now try to find the closest symbol that this rel is probably in */ \ 548 /* now try to find the closest symbol that this rel is probably in */ \
346 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 549 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
347 func = NULL; \ 550 func = NULL; \
348 offset_tmp = 0; \ 551 offset_tmp = 0; \
349 while (sym_max--) { \ 552 while (sym_max--) { \
350 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \ 553 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
351 func = sym; \ 554 func = sym; \
352 offset_tmp = EGET(sym->st_value); \ 555 offset_tmp = EGET(sym->st_value); \
353 } \ 556 } \
354 ++sym; \ 557 ++sym; \
355 } \ 558 } \
356 printf(" in "); \ 559 printf(" in "); \
357 if (func && func->st_name) \ 560 if (func && func->st_name) { \
358 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \ 561 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
562 if (r_offset > EGET(func->st_size)) \
563 printf("(optimized out: previous %s)", func_name); \
359 else \ 564 else \
360 printf("(NULL: fake?)"); \ 565 printf("%s", func_name); \
566 } else \
567 printf("(optimized out)"); \
361 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \ 568 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
569 if (be_verbose && has_objdump) { \
570 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
571 char *sysbuf; \
572 size_t syslen; \
573 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"; \
574 syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
575 sysbuf = xmalloc(syslen); \
576 if (end_addr < r_offset) \
577 /* not uncommon when things are optimized out */ \
578 end_addr = r_offset + 0x100; \
579 snprintf(sysbuf, syslen, sysfmt, \
580 (unsigned long)offset_tmp, \
581 (unsigned long)end_addr, \
582 elf->filename, \
583 (unsigned long)r_offset); \
584 fflush(stdout); \
585 if (system(sysbuf)) /* don't care */; \
586 fflush(stdout); \
587 free(sysbuf); \
588 } \
362 } \ 589 } \
363 } } 590 } }
364 SHOW_TEXTRELS(32) 591 SHOW_TEXTRELS(32)
365 SHOW_TEXTRELS(64) 592 SHOW_TEXTRELS(64)
366 } 593 }
368 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename); 595 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
369 596
370 return NULL; 597 return NULL;
371} 598}
372 599
373static void rpath_security_checks(elfobj *, char *);
374static void rpath_security_checks(elfobj *elf, char *item) { 600static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
601{
375 struct stat st; 602 struct stat st;
376 switch (*item) { 603 switch (*item) {
377 case '/': break; 604 case '/': break;
378 case '.': 605 case '.':
379 warnf("Security problem with relative RPATH '%s' in %s", item, elf->filename); 606 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
380 break; 607 break;
608 case ':':
381 case '\0': 609 case '\0':
382 warnf("Security problem NULL RPATH in %s", elf->filename); 610 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
383 break; 611 break;
384 case '$': 612 case '$':
385 if (fstat(elf->fd, &st) != -1) 613 if (fstat(elf->fd, &st) != -1)
386 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID)) 614 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
387 warnf("Security problem with RPATH='%s' in %s with mode set of %o", 615 warnf("Security problem with %s='%s' in %s with mode set of %o",
388 item, elf->filename, st.st_mode & 07777); 616 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
389 break; 617 break;
390 default: 618 default:
391 warnf("Maybe? sec problem with RPATH='%s' in %s", item, elf->filename); 619 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
392 break; 620 break;
393 } 621 }
394} 622}
395static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len) 623static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
396{ 624{
397 unsigned long i, s; 625 unsigned long i;
398 char *rpath, *runpath, **r; 626 char *rpath, *runpath, **r;
399 void *strtbl_void; 627 void *strtbl_void;
400 628
401 if (!show_rpath) return; 629 if (!show_rpath) return;
402 630
413 Elf ## B ## _Off offset; \ 641 Elf ## B ## _Off offset; \
414 Elf ## B ## _Xword word; \ 642 Elf ## B ## _Xword word; \
415 /* Scan all the program headers */ \ 643 /* Scan all the program headers */ \
416 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 644 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
417 /* Just scan dynamic headers */ \ 645 /* Just scan dynamic headers */ \
418 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 646 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
419 offset = EGET(phdr[i].p_offset); \ 647 offset = EGET(phdr[i].p_offset); \
420 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 648 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
421 /* Just scan dynamic RPATH/RUNPATH headers */ \ 649 /* Just scan dynamic RPATH/RUNPATH headers */ \
422 dyn = DYN ## B (elf->data + offset); \ 650 dyn = DYN ## B (elf->vdata + offset); \
423 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \ 651 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
424 if (word == DT_RPATH) { \ 652 if (word == DT_RPATH) { \
425 r = &rpath; \ 653 r = &rpath; \
426 } else if (word == DT_RUNPATH) { \ 654 } else if (word == DT_RUNPATH) { \
427 r = &runpath; \ 655 r = &runpath; \
431 } \ 659 } \
432 /* Verify the memory is somewhat sane */ \ 660 /* Verify the memory is somewhat sane */ \
433 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 661 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
434 if (offset < (Elf ## B ## _Off)elf->len) { \ 662 if (offset < (Elf ## B ## _Off)elf->len) { \
435 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \ 663 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
436 *r = (char*)(elf->data + offset); \ 664 *r = elf->data + offset; \
665 /* cache the length in case we need to nuke this section later on */ \
666 if (fix_elf) \
667 offset = strlen(*r); \
437 /* If quiet, don't output paths in ld.so.conf */ \ 668 /* If quiet, don't output paths in ld.so.conf */ \
438 if (be_quiet) { \ 669 if (be_quiet) { \
439 size_t len; \ 670 size_t len; \
440 char *start, *end; \ 671 char *start, *end; \
441 /* note that we only 'chop' off leading known paths. */ \ 672 /* note that we only 'chop' off leading known paths. */ \
442 /* since *r is read-only memory, we can only move the ptr forward. */ \ 673 /* since *r is read-only memory, we can only move the ptr forward. */ \
443 start = *r; \ 674 start = *r; \
444 /* scan each path in : delimited list */ \ 675 /* scan each path in : delimited list */ \
445 while (start) { \ 676 while (start) { \
446 rpath_security_checks(elf, start); \ 677 rpath_security_checks(elf, start, get_elfdtype(word)); \
447 end = strchr(start, ':'); \ 678 end = strchr(start, ':'); \
448 len = (end ? abs(end - start) : strlen(start)); \ 679 len = (end ? abs(end - start) : strlen(start)); \
449 for (s = 0; ldpaths[s]; ++s) { \ 680 if (use_ldcache) { \
681 size_t n; \
682 const char *ldpath; \
683 array_for_each(ldpaths, n, ldpath) \
450 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \ 684 if (!strncmp(ldpath, start, len) && !ldpath[len]) { \
451 *r = (end ? end + 1 : NULL); \ 685 *r = end; \
686 /* corner case ... if RPATH reads "/usr/lib:", we want \
687 * to show ':' rather than '' */ \
688 if (end && end[1] != '\0') \
689 (*r)++; \
452 break; \ 690 break; \
453 } \ 691 } \
454 } \ 692 } \
455 if (!*r || !ldpaths[s] || !end) \ 693 if (!*r || !end) \
456 start = NULL; \ 694 break; \
457 else \ 695 else \
458 start = start + len + 1; \ 696 start = start + len + 1; \
459 } \ 697 } \
460 } \ 698 } \
699 if (*r) { \
700 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
701 /* just nuke it */ \
702 nuke_it##B: \
703 memset(*r, 0x00, offset); \
704 *r = NULL; \
705 ESET(dyn->d_tag, DT_DEBUG); \
706 ESET(dyn->d_un.d_ptr, 0); \
707 } else if (fix_elf) { \
708 /* try to clean "bad" paths */ \
709 size_t len, tmpdir_len; \
710 char *start, *end; \
711 const char *tmpdir; \
712 start = *r; \
713 tmpdir = (getenv("TMPDIR") ? : "."); \
714 tmpdir_len = strlen(tmpdir); \
715 while (1) { \
716 end = strchr(start, ':'); \
717 if (start == end) { \
718 eat_this_path##B: \
719 len = strlen(end); \
720 memmove(start, end+1, len); \
721 start[len-1] = '\0'; \
722 end = start - 1; \
723 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
724 if (!end) { \
725 if (start == *r) \
726 goto nuke_it##B; \
727 *--start = '\0'; \
728 } else \
729 goto eat_this_path##B; \
730 } \
731 if (!end) \
732 break; \
733 start = end + 1; \
734 } \
735 if (**r == '\0') \
736 goto nuke_it##B; \
737 } \
738 if (*r) \
461 if (*r) *found_rpath = 1; \ 739 *found_rpath = 1; \
740 } \
462 } \ 741 } \
463 ++dyn; \ 742 ++dyn; \
464 } \ 743 } \
465 } } 744 } }
466 SHOW_RPATH(32) 745 SHOW_RPATH(32)
484 xstrcat(ret, (runpath ? runpath : rpath), ret_len); 763 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
485 else if (!be_quiet) 764 else if (!be_quiet)
486 xstrcat(ret, " - ", ret_len); 765 xstrcat(ret, " - ", ret_len);
487} 766}
488 767
768/* Defines can be seen in glibc's sysdeps/generic/ldconfig.h */
489#define LDSO_CACHE_MAGIC "ld.so-" 769#define LDSO_CACHE_MAGIC "ld.so-"
490#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1) 770#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
491#define LDSO_CACHE_VER "1.7.0" 771#define LDSO_CACHE_VER "1.7.0"
492#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1) 772#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
773#define FLAG_ANY -1
774#define FLAG_TYPE_MASK 0x00ff
775#define FLAG_LIBC4 0x0000
776#define FLAG_ELF 0x0001
777#define FLAG_ELF_LIBC5 0x0002
778#define FLAG_ELF_LIBC6 0x0003
779#define FLAG_REQUIRED_MASK 0xff00
780#define FLAG_SPARC_LIB64 0x0100
781#define FLAG_IA64_LIB64 0x0200
782#define FLAG_X8664_LIB64 0x0300
783#define FLAG_S390_LIB64 0x0400
784#define FLAG_POWERPC_LIB64 0x0500
785#define FLAG_MIPS64_LIBN32 0x0600
786#define FLAG_MIPS64_LIBN64 0x0700
787#define FLAG_X8664_LIBX32 0x0800
788#define FLAG_ARM_LIBHF 0x0900
789#define FLAG_AARCH64_LIB64 0x0a00
493 790
494static char *lookup_cache_lib(char *); 791#if defined(__GLIBC__) || defined(__UCLIBC__)
792
495static char *lookup_cache_lib(char *fname) 793static char *lookup_cache_lib(elfobj *elf, const char *fname)
496{ 794{
497 int fd = 0; 795 int fd;
498 char *strs; 796 char *strs;
499 static char buf[_POSIX_PATH_MAX] = ""; 797 static char buf[__PAX_UTILS_PATH_MAX] = "";
500 const char *cachefile = "/etc/ld.so.cache"; 798 const char *cachefile = root_rel_path("/etc/ld.so.cache");
501 struct stat st; 799 struct stat st;
502 800
503 typedef struct { 801 typedef struct {
504 char magic[LDSO_CACHE_MAGIC_LEN]; 802 char magic[LDSO_CACHE_MAGIC_LEN];
505 char version[LDSO_CACHE_VER_LEN]; 803 char version[LDSO_CACHE_VER_LEN];
506 int nlibs; 804 int nlibs;
507 } header_t; 805 } header_t;
806 header_t *header;
508 807
509 typedef struct { 808 typedef struct {
510 int flags; 809 int flags;
511 int sooffset; 810 int sooffset;
512 int liboffset; 811 int liboffset;
513 } libentry_t; 812 } libentry_t;
514
515 header_t *header;
516 libentry_t *libent; 813 libentry_t *libent;
517 814
518 if (fname == NULL) 815 if (fname == NULL)
519 return NULL; 816 return NULL;
520 817
521 if (ldcache == 0) { 818 if (ldcache == NULL) {
522 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) < 0) 819 if (fstatat(root_fd, cachefile, &st, 0))
523 return NULL; 820 return NULL;
524 /* save the cache size for latter unmapping */ 821
822 fd = openat(root_fd, cachefile, O_RDONLY);
823 if (fd == -1)
824 return NULL;
825
826 /* cache these values so we only map/unmap the cache file once */
525 ldcache_size = st.st_size; 827 ldcache_size = st.st_size;
828 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
829 close(fd);
526 830
527 if ((ldcache = mmap(0, st.st_size, PROT_READ, MAP_SHARED, fd, 0)) == (caddr_t) -1) 831 if (ldcache == MAP_FAILED) {
832 ldcache = NULL;
528 return NULL; 833 return NULL;
834 }
529 835
530 close(fd);
531
532 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN)) 836 if (memcmp(header->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN) ||
837 memcmp(header->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
838 {
839 munmap(ldcache, ldcache_size);
840 ldcache = NULL;
533 return NULL; 841 return NULL;
534
535 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
536 return NULL;
537 } 842 }
843 } else
844 header = ldcache;
538 845
539 header = (header_t *) ldcache;
540 libent = (libentry_t *) (ldcache + sizeof(header_t)); 846 libent = ldcache + sizeof(header_t);
541 strs = (char *) &libent[header->nlibs]; 847 strs = (char *) &libent[header->nlibs];
542 848
543 for (fd = 0; fd < header->nlibs; fd++) { 849 for (fd = 0; fd < header->nlibs; ++fd) {
850 /* This should be more fine grained, but for now we assume that
851 * diff arches will not be cached together, and we ignore the
852 * the different multilib mips cases.
853 */
854 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
855 continue;
856 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
857 continue;
858
544 if (strcmp(fname, strs + libent[fd].sooffset) != 0) 859 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
545 continue; 860 continue;
861
862 /* Return first hit because that is how the ldso rolls */
546 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf)); 863 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
864 break;
547 } 865 }
866
548 return buf; 867 return buf;
549} 868}
550 869
870#elif defined(__NetBSD__)
871static char *lookup_cache_lib(elfobj *elf, const char *fname)
872{
873 static char buf[__PAX_UTILS_PATH_MAX] = "";
874 static struct stat st;
875 size_t n;
876 char *ldpath;
877
878 array_for_each(ldpath, n, ldpath) {
879 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", ldpath, fname) >= sizeof(buf))
880 continue; /* if the pathname is too long, or something went wrong, ignore */
881
882 if (stat(buf, &st) != 0)
883 continue; /* if the lib doesn't exist in *ldpath, look further */
884
885 /* NetBSD doesn't actually do sanity checks, it just loads the file
886 * and if that doesn't work, continues looking in other directories.
887 * This cannot easily be safely emulated, unfortunately. For now,
888 * just assume that if it exists, it's a valid library. */
889
890 return buf;
891 }
892
893 /* not found in any path */
894 return NULL;
895}
896#else
897#ifdef __ELF__
898#warning Cache support not implemented for your target
899#endif
900static char *lookup_cache_lib(elfobj *elf, const char *fname)
901{
902 return NULL;
903}
904#endif
905
906static char *lookup_config_lib(elfobj *elf, char *fname)
907{
908 static char buf[__PAX_UTILS_PATH_MAX] = "";
909 const char *ldpath;
910 size_t n;
911
912 array_for_each(ldpaths, n, ldpath) {
913 snprintf(buf, sizeof(buf), "%s/%s", root_rel_path(ldpath), fname);
914 if (faccessat(root_fd, buf, F_OK, AT_SYMLINK_NOFOLLOW) == 0)
915 return buf;
916 }
917
918 return NULL;
919}
551 920
552static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len) 921static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
553{ 922{
554 unsigned long i; 923 unsigned long i;
555 char *needed; 924 char *needed;
556 void *strtbl_void; 925 void *strtbl_void;
557 char *p; 926 char *p;
558 927
928 /*
929 * -n -> op==0 -> print all
930 * -N -> op==1 -> print requested
931 */
559 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL; 932 if ((op == 0 && !show_needed) || (op == 1 && !find_lib))
933 return NULL;
560 934
561 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 935 strtbl_void = elf_findsecbyname(elf, ".dynstr");
562 936
563 if (elf->phdr && strtbl_void) { 937 if (elf->phdr && strtbl_void) {
564#define SHOW_NEEDED(B) \ 938#define SHOW_NEEDED(B) \
566 Elf ## B ## _Dyn *dyn; \ 940 Elf ## B ## _Dyn *dyn; \
567 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 941 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
568 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 942 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
569 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 943 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
570 Elf ## B ## _Off offset; \ 944 Elf ## B ## _Off offset; \
945 size_t matched = 0; \
946 /* Walk all the program headers to find the PT_DYNAMIC */ \
571 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 947 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
572 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 948 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) \
949 continue; \
573 offset = EGET(phdr[i].p_offset); \ 950 offset = EGET(phdr[i].p_offset); \
574 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 951 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
952 continue; \
953 /* Walk all the dynamic tags to find NEEDED entries */ \
575 dyn = DYN ## B (elf->data + offset); \ 954 dyn = DYN ## B (elf->vdata + offset); \
576 while (EGET(dyn->d_tag) != DT_NULL) { \ 955 while (EGET(dyn->d_tag) != DT_NULL) { \
577 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 956 if (EGET(dyn->d_tag) == DT_NEEDED) { \
578 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 957 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
579 if (offset >= (Elf ## B ## _Off)elf->len) { \ 958 if (offset >= (Elf ## B ## _Off)elf->len) { \
580 ++dyn; \ 959 ++dyn; \
581 continue; \ 960 continue; \
582 } \ 961 } \
583 needed = (char*)(elf->data + offset); \ 962 needed = elf->data + offset; \
584 if (op == 0) { \ 963 if (op == 0) { \
964 /* -n -> print all entries */ \
585 if (!be_wewy_wewy_quiet) { \ 965 if (!be_wewy_wewy_quiet) { \
586 if (*found_needed) xchrcat(ret, ',', ret_len); \ 966 if (*found_needed) xchrcat(ret, ',', ret_len); \
587 if (printcache) \ 967 if (use_ldpath) { \
588 if ((p = lookup_cache_lib(needed)) != NULL) \ 968 if ((p = lookup_config_lib(elf, needed)) != NULL) \
589 needed = p; \ 969 needed = p; \
970 } else if (use_ldcache) { \
971 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
972 needed = p; \
973 } \
590 xstrcat(ret, needed, ret_len); \ 974 xstrcat(ret, needed, ret_len); \
591 } \ 975 } \
592 *found_needed = 1; \ 976 *found_needed = 1; \
593 } else { \ 977 } else { \
594 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \ 978 /* -N -> print matching entries */ \
979 size_t n; \
980 const char *find_lib_name; \
981 \
982 array_for_each(find_lib_arr, n, find_lib_name) { \
983 int invert = 1; \
984 if (find_lib_name[0] == '!') \
985 invert = 0, ++find_lib_name; \
986 if (!strcmp(find_lib_name, needed) == invert) \
987 ++matched; \
988 } \
989 \
990 if (matched == array_cnt(find_lib_arr)) { \
595 *found_lib = 1; \ 991 *found_lib = 1; \
596 return (be_wewy_wewy_quiet ? NULL : needed); \ 992 return (be_wewy_wewy_quiet ? NULL : find_lib); \
597 } \ 993 } \
598 } \ 994 } \
599 } \ 995 } \
600 ++dyn; \ 996 ++dyn; \
601 } \ 997 } \
623 *found_interp = 1; \ 1019 *found_interp = 1; \
624 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \ 1020 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
625 } 1021 }
626 SHOW_INTERP(32) 1022 SHOW_INTERP(32)
627 SHOW_INTERP(64) 1023 SHOW_INTERP(64)
1024 } else {
1025 /* Walk all the program headers to find the PT_INTERP */
1026#define SHOW_PT_INTERP(B) \
1027 if (elf->elf_class == ELFCLASS ## B) { \
1028 unsigned long i; \
1029 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1030 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1031 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1032 if (EGET(phdr[i].p_type) != PT_INTERP) \
1033 continue; \
1034 *found_interp = 1; \
1035 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(phdr[i].p_offset)); \
1036 } \
628 } 1037 }
1038 SHOW_PT_INTERP(32)
1039 SHOW_PT_INTERP(64)
1040 }
1041
629 return NULL; 1042 return NULL;
630} 1043}
631static char *scanelf_file_bind(elfobj *elf, char *found_bind) 1044static char *scanelf_file_bind(elfobj *elf, char *found_bind)
632{ 1045{
633 unsigned long i; 1046 unsigned long i;
634 struct stat s; 1047 struct stat s;
1048 char dynamic = 0;
635 1049
636 if (!show_bind) return NULL; 1050 if (!show_bind) return NULL;
637 if (!elf->phdr) return NULL; 1051 if (!elf->phdr) return NULL;
638 1052
639#define SHOW_BIND(B) \ 1053#define SHOW_BIND(B) \
641 Elf ## B ## _Dyn *dyn; \ 1055 Elf ## B ## _Dyn *dyn; \
642 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 1056 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
643 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 1057 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
644 Elf ## B ## _Off offset; \ 1058 Elf ## B ## _Off offset; \
645 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 1059 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
646 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 1060 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1061 dynamic = 1; \
647 offset = EGET(phdr[i].p_offset); \ 1062 offset = EGET(phdr[i].p_offset); \
648 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 1063 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
649 dyn = DYN ## B (elf->data + offset); \ 1064 dyn = DYN ## B (elf->vdata + offset); \
650 while (EGET(dyn->d_tag) != DT_NULL) { \ 1065 while (EGET(dyn->d_tag) != DT_NULL) { \
651 if (EGET(dyn->d_tag) == DT_BIND_NOW || \ 1066 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
652 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \ 1067 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
653 { \ 1068 { \
654 if (be_quiet) return NULL; \ 1069 if (be_quiet) return NULL; \
662 SHOW_BIND(32) 1077 SHOW_BIND(32)
663 SHOW_BIND(64) 1078 SHOW_BIND(64)
664 1079
665 if (be_wewy_wewy_quiet) return NULL; 1080 if (be_wewy_wewy_quiet) return NULL;
666 1081
1082 /* don't output anything if quiet mode and the ELF is static or not setuid */
667 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) { 1083 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
668 return NULL; 1084 return NULL;
669 } else { 1085 } else {
670 *found_bind = 1; 1086 *found_bind = 1;
671 return (char *) "LAZY"; 1087 return (char *)(dynamic ? "LAZY" : "STATIC");
672 } 1088 }
673} 1089}
674static char *scanelf_file_soname(elfobj *elf, char *found_soname) 1090static char *scanelf_file_soname(elfobj *elf, char *found_soname)
675{ 1091{
676 unsigned long i; 1092 unsigned long i;
688 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 1104 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
689 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 1105 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
690 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 1106 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
691 Elf ## B ## _Off offset; \ 1107 Elf ## B ## _Off offset; \
692 /* only look for soname in shared objects */ \ 1108 /* only look for soname in shared objects */ \
693 if (ehdr->e_type != ET_DYN) \ 1109 if (EGET(ehdr->e_type) != ET_DYN) \
694 return NULL; \ 1110 return NULL; \
695 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 1111 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
696 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 1112 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
697 offset = EGET(phdr[i].p_offset); \ 1113 offset = EGET(phdr[i].p_offset); \
698 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 1114 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
699 dyn = DYN ## B (elf->data + offset); \ 1115 dyn = DYN ## B (elf->vdata + offset); \
700 while (EGET(dyn->d_tag) != DT_NULL) { \ 1116 while (EGET(dyn->d_tag) != DT_NULL) { \
701 if (EGET(dyn->d_tag) == DT_SONAME) { \ 1117 if (EGET(dyn->d_tag) == DT_SONAME) { \
702 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 1118 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
703 if (offset >= (Elf ## B ## _Off)elf->len) { \ 1119 if (offset >= (Elf ## B ## _Off)elf->len) { \
704 ++dyn; \ 1120 ++dyn; \
705 continue; \ 1121 continue; \
706 } \ 1122 } \
707 soname = (char*)(elf->data + offset); \ 1123 soname = elf->data + offset; \
708 *found_soname = 1; \ 1124 *found_soname = 1; \
709 return (be_wewy_wewy_quiet ? NULL : soname); \ 1125 return (be_wewy_wewy_quiet ? NULL : soname); \
710 } \ 1126 } \
711 ++dyn; \ 1127 ++dyn; \
712 } \ 1128 } \
715 SHOW_SONAME(64) 1131 SHOW_SONAME(64)
716 } 1132 }
717 1133
718 return NULL; 1134 return NULL;
719} 1135}
1136
1137/*
1138 * We support the symbol form:
1139 * [%[modifiers]%][[+-]<symbol name>][,[.....]]
1140 * If the symbol name is empty, then all symbols are matched.
1141 * If the symbol name is a glob ("*"), then all symbols are dumped (debug).
1142 * Do not rely on this output format at all.
1143 * Otherwise the symbol name is used to search (either regex or string compare).
1144 * If the first char of the symbol name is a plus ("+"), then only match
1145 * defined symbols. If it's a minus ("-"), only match undefined symbols.
1146 * Putting modifiers in between the percent signs allows for more in depth
1147 * filters. There are groups of modifiers. If you don't specify a member
1148 * of a group, then all types in that group are matched. The current
1149 * groups and their types are:
1150 * STT group: STT_NOTYPE:n STT_OBJECT:o STT_FUNC:f STT_FILE:F
1151 * STB group: STB_LOCAL:l STB_GLOBAL:g STB_WEAK:w
1152 * SHN group: SHN_UNDEF:u SHN_ABS:a SHN_COMMON:c {defined}:d
1153 * The "defined" value in the SHN group does not correspond to a SHN_xxx define.
1154 * You can search for multiple symbols at once by seperating with a comma (",").
1155 *
1156 * Some examples:
1157 * ELFs with a weak function "foo":
1158 * scanelf -s %wf%foo <ELFs>
1159 * ELFs that define the symbol "main":
1160 * scanelf -s +main <ELFs>
1161 * scanelf -s %d%main <ELFs>
1162 * ELFs that refer to the undefined symbol "brk":
1163 * scanelf -s -brk <ELFs>
1164 * scanelf -s %u%brk <ELFs>
1165 * All global defined objects in an ELF:
1166 * scanelf -s %ogd% <ELF>
1167 */
1168static void
1169scanelf_match_symname(elfobj *elf, char *found_sym, char **ret, size_t *ret_len, const char *symname,
1170 unsigned int stt, unsigned int stb, unsigned int shn, unsigned long size)
1171{
1172 const char *this_sym;
1173 size_t n;
1174
1175 array_for_each(find_sym_arr, n, this_sym) {
1176 bool inc_notype, inc_object, inc_func, inc_file,
1177 inc_local, inc_global, inc_weak,
1178 inc_def, inc_undef, inc_abs, inc_common;
1179
1180 /* symbol selection! */
1181 inc_notype = inc_object = inc_func = inc_file = \
1182 inc_local = inc_global = inc_weak = \
1183 inc_def = inc_undef = inc_abs = inc_common = \
1184 (*this_sym != '%');
1185
1186 /* parse the contents of %...% */
1187 if (!inc_notype) {
1188 while (*(this_sym++)) {
1189 if (*this_sym == '%') {
1190 ++this_sym;
1191 break;
1192 }
1193 switch (*this_sym) {
1194 case 'n': inc_notype = true; break;
1195 case 'o': inc_object = true; break;
1196 case 'f': inc_func = true; break;
1197 case 'F': inc_file = true; break;
1198 case 'l': inc_local = true; break;
1199 case 'g': inc_global = true; break;
1200 case 'w': inc_weak = true; break;
1201 case 'd': inc_def = true; break;
1202 case 'u': inc_undef = true; break;
1203 case 'a': inc_abs = true; break;
1204 case 'c': inc_common = true; break;
1205 default: err("invalid symbol selector '%c'", *this_sym);
1206 }
1207 }
1208
1209 /* If no types are matched, not match all */
1210 if (!inc_notype && !inc_object && !inc_func && !inc_file)
1211 inc_notype = inc_object = inc_func = inc_file = true;
1212 if (!inc_local && !inc_global && !inc_weak)
1213 inc_local = inc_global = inc_weak = true;
1214 if (!inc_def && !inc_undef && !inc_abs && !inc_common)
1215 inc_def = inc_undef = inc_abs = inc_common = true;
1216
1217 /* backwards compat for defined/undefined short hand */
1218 } else if (*this_sym == '+') {
1219 inc_undef = false;
1220 ++this_sym;
1221 } else if (*this_sym == '-') {
1222 inc_def = inc_abs = inc_common = false;
1223 ++this_sym;
1224 }
1225
1226 /* filter symbols */
1227 if ((!inc_notype && stt == STT_NOTYPE) || \
1228 (!inc_object && stt == STT_OBJECT) || \
1229 (!inc_func && stt == STT_FUNC ) || \
1230 (!inc_file && stt == STT_FILE ) || \
1231 (!inc_local && stb == STB_LOCAL ) || \
1232 (!inc_global && stb == STB_GLOBAL) || \
1233 (!inc_weak && stb == STB_WEAK ) || \
1234 (!inc_def && shn && shn < SHN_LORESERVE) || \
1235 (!inc_undef && shn == SHN_UNDEF ) || \
1236 (!inc_abs && shn == SHN_ABS ) || \
1237 (!inc_common && shn == SHN_COMMON))
1238 continue;
1239
1240 if (*this_sym == '*') {
1241 /* a "*" symbol gets you debug output */
1242 printf("%s(%s) %5lX %15s %15s %15s %s\n",
1243 ((*found_sym == 0) ? "\n\t" : "\t"),
1244 elf->base_filename,
1245 size,
1246 get_elfstttype(stt),
1247 get_elfstbtype(stb),
1248 get_elfshntype(shn),
1249 symname);
1250 goto matched;
1251
1252 } else {
1253 if (g_match) {
1254 /* regex match the symbol */
1255 if (regexec(find_sym_regex_arr->eles[n], symname, 0, NULL, 0) == REG_NOMATCH)
1256 continue;
1257
1258 } else if (*this_sym) {
1259 /* give empty symbols a "pass", else do a normal compare */
1260 const size_t len = strlen(this_sym);
1261 if (!(strncmp(this_sym, symname, len) == 0 &&
1262 /* Accept unversioned symbol names */
1263 (symname[len] == '\0' || symname[len] == '@')))
1264 continue;
1265 }
1266
1267 if (be_semi_verbose) {
1268 char buf[1024];
1269 snprintf(buf, sizeof(buf), "%lX %s %s",
1270 size,
1271 get_elfstttype(stt),
1272 this_sym);
1273 *ret = xstrdup(buf);
1274 } else {
1275 if (*ret) xchrcat(ret, ',', ret_len);
1276 xstrcat(ret, symname, ret_len);
1277 }
1278
1279 goto matched;
1280 }
1281 }
1282
1283 return;
1284
1285 matched:
1286 *found_sym = 1;
1287}
1288
720static char *scanelf_file_sym(elfobj *elf, char *found_sym) 1289static const char *scanelf_file_sym(elfobj *elf, char *found_sym)
721{ 1290{
722 unsigned long i;
723 char *ret; 1291 char *ret;
724 void *symtab_void, *strtab_void; 1292 void *symtab_void, *strtab_void;
725 1293
726 if (!find_sym) return NULL; 1294 if (!find_sym) return NULL;
727 ret = find_sym; 1295 ret = NULL;
728 1296
729 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void); 1297 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
730 1298
731 if (symtab_void && strtab_void) { 1299 if (symtab_void && strtab_void) {
732#define FIND_SYM(B) \ 1300#define FIND_SYM(B) \
733 if (elf->elf_class == ELFCLASS ## B) { \ 1301 if (elf->elf_class == ELFCLASS ## B) { \
734 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 1302 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
735 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 1303 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
736 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 1304 Elf ## B ## _Sym *sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
737 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 1305 Elf ## B ## _Word i, cnt = EGET(symtab->sh_entsize); \
738 char *symname; \ 1306 char *symname; \
1307 size_t ret_len = 0; \
1308 if (cnt) \
1309 cnt = EGET(symtab->sh_size) / cnt; \
739 for (i = 0; i < cnt; ++i) { \ 1310 for (i = 0; i < cnt; ++i) { \
1311 if ((void*)sym > elf->data_end) { \
1312 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1313 goto break_out; \
1314 } \
740 if (sym->st_name) { \ 1315 if (sym->st_name) { \
1316 /* make sure the symbol name is in acceptable memory range */ \
741 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 1317 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
742 if (*find_sym == '*') { \ 1318 if ((void*)symname > elf->data_end) { \
743 printf("%s(%s) %5lX %15s %s\n", \ 1319 warnf("%s: corrupt ELF symbols", elf->filename); \
744 ((*found_sym == 0) ? "\n\t" : "\t"), \ 1320 ++sym; \
745 elf->base_filename, \ 1321 continue; \
746 (unsigned long)sym->st_size, \
747 get_elfstttype(sym->st_info), \
748 symname); \
749 *found_sym = 1; \
750 } else { \
751 char *this_sym, *next_sym; \
752 this_sym = find_sym; \
753 do { \
754 next_sym = strchr(this_sym, ','); \
755 if (next_sym == NULL) \
756 next_sym = this_sym + strlen(this_sym); \
757 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
758 (strcmp(symname, versioned_symname) == 0)) { \
759 ret = this_sym; \
760 (*found_sym)++; \
761 goto break_out; \
762 } \
763 this_sym = next_sym + 1; \
764 } while (*next_sym != '\0'); \
765 } \ 1322 } \
1323 scanelf_match_symname(elf, found_sym, \
1324 &ret, &ret_len, symname, \
1325 ELF##B##_ST_TYPE(EGET(sym->st_info)), \
1326 ELF##B##_ST_BIND(EGET(sym->st_info)), \
1327 EGET(sym->st_shndx), \
1328 /* st_size can be 64bit, but no one is really that big, so screw em */ \
1329 EGET(sym->st_size)); \
766 } \ 1330 } \
767 ++sym; \ 1331 ++sym; \
768 } } 1332 } \
1333 }
769 FIND_SYM(32) 1334 FIND_SYM(32)
770 FIND_SYM(64) 1335 FIND_SYM(64)
771 } 1336 }
772 1337
773break_out: 1338break_out:
776 if (*find_sym != '*' && *found_sym) 1341 if (*find_sym != '*' && *found_sym)
777 return ret; 1342 return ret;
778 if (be_quiet) 1343 if (be_quiet)
779 return NULL; 1344 return NULL;
780 else 1345 else
781 return (char *)" - "; 1346 return " - ";
782} 1347}
1348
1349static const char *scanelf_file_sections(elfobj *elf, char *found_section)
1350{
1351 if (!find_section)
1352 return NULL;
1353
1354#define FIND_SECTION(B) \
1355 if (elf->elf_class == ELFCLASS ## B) { \
1356 size_t matched, n; \
1357 int invert; \
1358 const char *section_name; \
1359 Elf ## B ## _Shdr *section; \
1360 \
1361 matched = 0; \
1362 array_for_each(find_section_arr, n, section_name) { \
1363 invert = (*section_name == '!' ? 1 : 0); \
1364 section = SHDR ## B (elf_findsecbyname(elf, section_name + invert)); \
1365 if ((section == NULL && invert) || (section != NULL && !invert)) \
1366 ++matched; \
1367 } \
1368 \
1369 if (matched == array_cnt(find_section_arr)) \
1370 *found_section = 1; \
1371 }
1372 FIND_SECTION(32)
1373 FIND_SECTION(64)
1374
1375 if (be_wewy_wewy_quiet)
1376 return NULL;
1377
1378 if (*found_section)
1379 return find_section;
1380
1381 if (be_quiet)
1382 return NULL;
1383 else
1384 return " - ";
1385}
1386
783/* scan an elf file and show all the fun stuff */ 1387/* scan an elf file and show all the fun stuff */
784#define prints(str) write(fileno(stdout), str, strlen(str)) 1388#define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
785static void scanelf_file(const char *filename) 1389static int scanelf_elfobj(elfobj *elf)
786{ 1390{
787 unsigned long i; 1391 unsigned long i;
788 char found_pax, found_phdr, found_relro, found_load, found_textrel, 1392 char found_pax, found_phdr, found_relro, found_load, found_textrel,
789 found_rpath, found_needed, found_interp, found_bind, found_soname, 1393 found_rpath, found_needed, found_interp, found_bind, found_soname,
790 found_sym, found_lib, found_file, found_textrels; 1394 found_sym, found_lib, found_file, found_textrels, found_section;
791 elfobj *elf;
792 struct stat st;
793 static char *out_buffer = NULL; 1395 static char *out_buffer = NULL;
794 static size_t out_len; 1396 static size_t out_len;
795 1397
796 /* make sure 'filename' exists */
797 if (lstat(filename, &st) == -1) {
798 if (be_verbose > 2) printf("%s: does not exist\n", filename);
799 return;
800 }
801 /* always handle regular files and handle symlinked files if no -y */
802 if (S_ISLNK(st.st_mode)) {
803 if (!scan_symlink) return;
804 stat(filename, &st);
805 }
806 if (!S_ISREG(st.st_mode)) {
807 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
808 return;
809 }
810
811 found_pax = found_phdr = found_relro = found_load = found_textrel = \ 1398 found_pax = found_phdr = found_relro = found_load = found_textrel = \
812 found_rpath = found_needed = found_interp = found_bind = found_soname = \ 1399 found_rpath = found_needed = found_interp = found_bind = found_soname = \
813 found_sym = found_lib = found_file = found_textrels = 0; 1400 found_sym = found_lib = found_file = found_textrels = found_section = 0;
814 1401
815 /* verify this is real ELF */
816 if ((elf = readelf(filename)) == NULL) {
817 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
818 return;
819 }
820
821 if (be_verbose > 1) 1402 if (be_verbose > 2)
822 printf("%s: scanning file {%s,%s}\n", filename, 1403 printf("%s: scanning file {%s,%s}\n", elf->filename,
823 get_elfeitype(EI_CLASS, elf->elf_class), 1404 get_elfeitype(EI_CLASS, elf->elf_class),
824 get_elfeitype(EI_DATA, elf->data[EI_DATA])); 1405 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
825 else if (be_verbose) 1406 else if (be_verbose > 1)
826 printf("%s: scanning file\n", filename); 1407 printf("%s: scanning file\n", elf->filename);
827 1408
828 /* init output buffer */ 1409 /* init output buffer */
829 if (!out_buffer) { 1410 if (!out_buffer) {
830 out_len = sizeof(char) * 80; 1411 out_len = sizeof(char) * 80;
831 out_buffer = (char*)xmalloc(out_len); 1412 out_buffer = xmalloc(out_len);
832 } 1413 }
833 *out_buffer = '\0'; 1414 *out_buffer = '\0';
834 1415
835 /* show the header */ 1416 /* show the header */
836 if (!be_quiet && show_banner) { 1417 if (!be_quiet && show_banner) {
837 for (i = 0; out_format[i]; ++i) { 1418 for (i = 0; out_format[i]; ++i) {
838 if (!IS_MODIFIER(out_format[i])) continue; 1419 if (!IS_MODIFIER(out_format[i])) continue;
839 1420
840 switch (out_format[++i]) { 1421 switch (out_format[++i]) {
1422 case '+': break;
841 case '%': break; 1423 case '%': break;
842 case '#': break; 1424 case '#': break;
843 case 'F': 1425 case 'F':
844 case 'p': 1426 case 'p':
845 case 'f': prints("FILE "); found_file = 1; break; 1427 case 'f': prints("FILE "); found_file = 1; break;
846 case 'o': prints(" TYPE "); break; 1428 case 'o': prints(" TYPE "); break;
847 case 'x': prints(" PAX "); break; 1429 case 'x': prints(" PAX "); break;
848 case 'e': prints("STK/REL/PTL "); break; 1430 case 'e': prints("STK/REL/PTL "); break;
849 case 't': prints("TEXTREL "); break; 1431 case 't': prints("TEXTREL "); break;
850 case 'r': prints("RPATH "); break; 1432 case 'r': prints("RPATH "); break;
1433 case 'M': prints("CLASS "); break;
1434 case 'l':
851 case 'n': prints("NEEDED "); break; 1435 case 'n': prints("NEEDED "); break;
852 case 'i': prints("INTERP "); break; 1436 case 'i': prints("INTERP "); break;
853 case 'b': prints("BIND "); break; 1437 case 'b': prints("BIND "); break;
1438 case 'Z': prints("SIZE "); break;
854 case 'S': prints("SONAME "); break; 1439 case 'S': prints("SONAME "); break;
855 case 's': prints("SYM "); break; 1440 case 's': prints("SYM "); break;
856 case 'N': prints("LIB "); break; 1441 case 'N': prints("LIB "); break;
857 case 'T': prints("TEXTRELS "); break; 1442 case 'T': prints("TEXTRELS "); break;
1443 case 'k': prints("SECTION "); break;
1444 case 'a': prints("ARCH "); break;
1445 case 'I': prints("OSABI "); break;
1446 case 'Y': prints("EABI "); break;
1447 case 'O': prints("PERM "); break;
1448 case 'D': prints("ENDIAN "); break;
858 default: warnf("'%c' has no title ?", out_format[i]); 1449 default: warnf("'%c' has no title ?", out_format[i]);
859 } 1450 }
860 } 1451 }
861 if (!found_file) prints("FILE "); 1452 if (!found_file) prints("FILE ");
862 prints("\n"); 1453 prints("\n");
866 1457
867 /* dump all the good stuff */ 1458 /* dump all the good stuff */
868 for (i = 0; out_format[i]; ++i) { 1459 for (i = 0; out_format[i]; ++i) {
869 const char *out; 1460 const char *out;
870 const char *tmp; 1461 const char *tmp;
871 1462 static char ubuf[sizeof(unsigned long)*2];
872 /* make sure we trim leading spaces in quiet mode */
873 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
874 *out_buffer = '\0';
875
876 if (!IS_MODIFIER(out_format[i])) { 1463 if (!IS_MODIFIER(out_format[i])) {
877 xchrcat(&out_buffer, out_format[i], &out_len); 1464 xchrcat(&out_buffer, out_format[i], &out_len);
878 continue; 1465 continue;
879 } 1466 }
880 1467
881 out = NULL; 1468 out = NULL;
882 be_wewy_wewy_quiet = (out_format[i] == '#'); 1469 be_wewy_wewy_quiet = (out_format[i] == '#');
1470 be_semi_verbose = (out_format[i] == '+');
883 switch (out_format[++i]) { 1471 switch (out_format[++i]) {
1472 case '+':
884 case '%': 1473 case '%':
885 case '#': 1474 case '#':
886 xchrcat(&out_buffer, out_format[i], &out_len); break; 1475 xchrcat(&out_buffer, out_format[i], &out_len); break;
887 case 'F': 1476 case 'F':
888 found_file = 1; 1477 found_file = 1;
889 if (be_wewy_wewy_quiet) break; 1478 if (be_wewy_wewy_quiet) break;
890 xstrcat(&out_buffer, filename, &out_len); 1479 xstrcat(&out_buffer, elf->filename, &out_len);
891 break; 1480 break;
892 case 'p': 1481 case 'p':
893 found_file = 1; 1482 found_file = 1;
894 if (be_wewy_wewy_quiet) break; 1483 if (be_wewy_wewy_quiet) break;
895 tmp = filename; 1484 tmp = elf->filename;
896 if (search_path) { 1485 if (search_path) {
897 ssize_t len_search = strlen(search_path); 1486 ssize_t len_search = strlen(search_path);
898 ssize_t len_file = strlen(filename); 1487 ssize_t len_file = strlen(elf->filename);
899 if (!strncmp(filename, search_path, len_search) && \ 1488 if (!strncmp(elf->filename, search_path, len_search) && \
900 len_file > len_search) 1489 len_file > len_search)
901 tmp += len_search; 1490 tmp += len_search;
902 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++; 1491 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
903 } 1492 }
904 xstrcat(&out_buffer, tmp, &out_len); 1493 xstrcat(&out_buffer, tmp, &out_len);
905 break; 1494 break;
906 case 'f': 1495 case 'f':
907 found_file = 1; 1496 found_file = 1;
908 if (be_wewy_wewy_quiet) break; 1497 if (be_wewy_wewy_quiet) break;
909 tmp = strrchr(filename, '/'); 1498 tmp = strrchr(elf->filename, '/');
910 tmp = (tmp == NULL ? filename : tmp+1); 1499 tmp = (tmp == NULL ? elf->filename : tmp+1);
911 xstrcat(&out_buffer, tmp, &out_len); 1500 xstrcat(&out_buffer, tmp, &out_len);
912 break; 1501 break;
913 case 'o': out = get_elfetype(elf); break; 1502 case 'o': out = get_elfetype(elf); break;
914 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1503 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
915 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break; 1504 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
916 case 't': out = scanelf_file_textrel(elf, &found_textrel); break; 1505 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
917 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break; 1506 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
918 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break; 1507 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1508 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1509 case 'D': out = get_endian(elf); break;
1510 case 'O': out = strfileperms(elf->filename); break;
919 case 'n': 1511 case 'n':
920 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break; 1512 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
921 case 'i': out = scanelf_file_interp(elf, &found_interp); break; 1513 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
922 case 'b': out = scanelf_file_bind(elf, &found_bind); break; 1514 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
923 case 'S': out = scanelf_file_soname(elf, &found_soname); break; 1515 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
924 case 's': out = scanelf_file_sym(elf, &found_sym); break; 1516 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1517 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1518 case 'a': out = get_elfemtype(elf); break;
1519 case 'I': out = get_elfosabi(elf); break;
1520 case 'Y': out = get_elf_eabi(elf); break;
1521 case 'Z': snprintf(ubuf, sizeof(ubuf), "%lu", (unsigned long)elf->len); out = ubuf; break;;
925 default: warnf("'%c' has no scan code?", out_format[i]); 1522 default: warnf("'%c' has no scan code?", out_format[i]);
926 } 1523 }
927 if (out) { 1524 if (out)
928 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
929 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
930 xstrncat(&out_buffer, out, &out_len, (tmp-out));
931 else
932 xstrcat(&out_buffer, out, &out_len); 1525 xstrcat(&out_buffer, out, &out_len);
933 }
934 } 1526 }
935 1527
936#define FOUND_SOMETHING() \ 1528#define FOUND_SOMETHING() \
937 (found_pax || found_phdr || found_relro || found_load || found_textrel || \ 1529 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
938 found_rpath || found_needed || found_interp || found_bind || \ 1530 found_rpath || found_needed || found_interp || found_bind || \
939 found_soname || found_sym || found_lib || found_textrels) 1531 found_soname || found_sym || found_lib || found_textrels || found_section )
940 1532
941 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) { 1533 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
942 xchrcat(&out_buffer, ' ', &out_len); 1534 xchrcat(&out_buffer, ' ', &out_len);
943 xstrcat(&out_buffer, filename, &out_len); 1535 xstrcat(&out_buffer, elf->filename, &out_len);
944 } 1536 }
945 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) { 1537 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
946 puts(out_buffer); 1538 puts(out_buffer);
947 fflush(stdout); 1539 fflush(stdout);
948 } 1540 }
949 1541
1542 return 0;
1543}
1544
1545/* scan a single elf */
1546static int scanelf_elf(const char *filename, int fd, size_t len)
1547{
1548 int ret = 1;
1549 elfobj *elf;
1550
1551 /* verify this is real ELF */
1552 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1553 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1554 return 2;
1555 }
1556 switch (match_bits) {
1557 case 32:
1558 if (elf->elf_class != ELFCLASS32)
1559 goto label_done;
1560 break;
1561 case 64:
1562 if (elf->elf_class != ELFCLASS64)
1563 goto label_done;
1564 break;
1565 default: break;
1566 }
1567 if (match_etypes) {
1568 char sbuf[126];
1569 strncpy(sbuf, match_etypes, sizeof(sbuf));
1570 if (strchr(match_etypes, ',') != NULL) {
1571 char *p;
1572 while ((p = strrchr(sbuf, ',')) != NULL) {
1573 *p = 0;
1574 if (etype_lookup(p+1) == get_etype(elf))
1575 goto label_ret;
1576 }
1577 }
1578 if (etype_lookup(sbuf) != get_etype(elf))
1579 goto label_done;
1580 }
1581
1582label_ret:
1583 ret = scanelf_elfobj(elf);
1584
1585label_done:
950 unreadelf(elf); 1586 unreadelf(elf);
1587 return ret;
1588}
1589
1590/* scan an archive of elfs */
1591static int scanelf_archive(const char *filename, int fd, size_t len)
1592{
1593 archive_handle *ar;
1594 archive_member *m;
1595 char *ar_buffer;
1596 elfobj *elf;
1597
1598 ar = ar_open_fd(filename, fd);
1599 if (ar == NULL)
1600 return 1;
1601
1602 ar_buffer = mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1603 while ((m = ar_next(ar)) != NULL) {
1604 off_t cur_pos = lseek(fd, 0, SEEK_CUR);
1605 if (cur_pos == -1)
1606 errp("lseek() failed");
1607 elf = readelf_buffer(m->name, ar_buffer + cur_pos, m->size);
1608 if (elf) {
1609 scanelf_elfobj(elf);
1610 unreadelf(elf);
1611 }
1612 }
1613 munmap(ar_buffer, len);
1614
1615 return 0;
1616}
1617/* scan a file which may be an elf or an archive or some other magical beast */
1618static int scanelf_fileat(int dir_fd, const char *filename, const struct stat *st_cache)
1619{
1620 const struct stat *st = st_cache;
1621 struct stat symlink_st;
1622 int fd;
1623
1624 /* always handle regular files and handle symlinked files if no -y */
1625 if (S_ISLNK(st->st_mode)) {
1626 if (!scan_symlink)
1627 return 1;
1628 fstatat(dir_fd, filename, &symlink_st, 0);
1629 st = &symlink_st;
1630 }
1631
1632 if (!S_ISREG(st->st_mode)) {
1633 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1634 return 1;
1635 }
1636
1637 if (match_perms) {
1638 if ((st->st_mode | match_perms) != st->st_mode)
1639 return 1;
1640 }
1641 fd = openat(dir_fd, filename, (fix_elf ? O_RDWR : O_RDONLY) | O_CLOEXEC);
1642 if (fd == -1) {
1643 if (fix_elf && errno == ETXTBSY)
1644 warnp("%s: could not fix", filename);
1645 else if (be_verbose > 2)
1646 printf("%s: skipping file: %s\n", filename, strerror(errno));
1647 return 1;
1648 }
1649
1650 if (scanelf_elf(filename, fd, st->st_size) == 2) {
1651 /* if it isn't an ELF, maybe it's an .a archive */
1652 if (scan_archives)
1653 scanelf_archive(filename, fd, st->st_size);
1654
1655 /*
1656 * unreadelf() implicitly closes its fd, so only close it
1657 * when we are returning it in the non-ELF case
1658 */
1659 close(fd);
1660 }
1661
1662 return 0;
951} 1663}
952 1664
953/* scan a directory for ET_EXEC files and print when we find one */ 1665/* scan a directory for ET_EXEC files and print when we find one */
954static void scanelf_dir(const char *path) 1666static int scanelf_dirat(int dir_fd, const char *path)
955{ 1667{
956 register DIR *dir; 1668 register DIR *dir;
957 register struct dirent *dentry; 1669 register struct dirent *dentry;
958 struct stat st_top, st; 1670 struct stat st_top, st;
959 char buf[_POSIX_PATH_MAX]; 1671 char buf[__PAX_UTILS_PATH_MAX], *subpath;
960 size_t pathlen = 0, len = 0; 1672 size_t pathlen = 0, len = 0;
1673 int ret = 0;
1674 int subdir_fd;
961 1675
962 /* make sure path exists */ 1676 /* make sure path exists */
963 if (lstat(path, &st_top) == -1) { 1677 if (fstatat(dir_fd, path, &st_top, AT_SYMLINK_NOFOLLOW) == -1) {
964 if (be_verbose > 2) printf("%s: does not exist\n", path); 1678 if (be_verbose > 2) printf("%s: does not exist\n", path);
965 return; 1679 return 1;
966 } 1680 }
967 1681
968 /* ok, if it isn't a directory, assume we can open it */ 1682 /* ok, if it isn't a directory, assume we can open it */
969 if (!S_ISDIR(st_top.st_mode)) { 1683 if (!S_ISDIR(st_top.st_mode))
970 scanelf_file(path); 1684 return scanelf_fileat(dir_fd, path, &st_top);
971 return;
972 }
973 1685
974 /* now scan the dir looking for fun stuff */ 1686 /* now scan the dir looking for fun stuff */
975 if ((dir = opendir(path)) == NULL) { 1687 subdir_fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
976 warnf("could not opendir %s: %s", path, strerror(errno)); 1688 if (subdir_fd == -1)
1689 dir = NULL;
1690 else
1691 dir = fdopendir(subdir_fd);
1692 if (dir == NULL) {
1693 if (subdir_fd != -1)
1694 close(subdir_fd);
1695 else if (be_verbose > 2)
1696 printf("%s: skipping dir: %s\n", path, strerror(errno));
977 return; 1697 return 1;
978 } 1698 }
979 if (be_verbose) printf("%s: scanning dir\n", path); 1699 if (be_verbose > 1) printf("%s: scanning dir\n", path);
980 1700
981 pathlen = strlen(path); 1701 subpath = stpcpy(buf, path);
1702 if (subpath[-1] != '/')
1703 *subpath++ = '/';
1704 pathlen = subpath - buf;
982 while ((dentry = readdir(dir))) { 1705 while ((dentry = readdir(dir))) {
983 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1706 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
984 continue; 1707 continue;
985 len = (pathlen + 1 + strlen(dentry->d_name) + 1); 1708
986 if (len >= sizeof(buf)) { 1709 if (fstatat(subdir_fd, dentry->d_name, &st, AT_SYMLINK_NOFOLLOW) == -1)
987 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
988 (unsigned long)len, (unsigned long)sizeof(buf));
989 continue; 1710 continue;
1711
1712 len = strlen(dentry->d_name);
1713 if (len + pathlen + 1 >= sizeof(buf)) {
1714 warnf("Skipping '%s%s': len > sizeof(buf); %zu > %zu\n",
1715 path, dentry->d_name, len + pathlen + 1, sizeof(buf));
1716 continue;
990 } 1717 }
991 sprintf(buf, "%s/%s", path, dentry->d_name); 1718 memcpy(subpath, dentry->d_name, len);
992 if (lstat(buf, &st) != -1) { 1719 subpath[len] = '\0';
1720
993 if (S_ISREG(st.st_mode)) 1721 if (S_ISREG(st.st_mode))
994 scanelf_file(buf); 1722 ret = scanelf_fileat(dir_fd, buf, &st);
995 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1723 else if (dir_recurse && S_ISDIR(st.st_mode)) {
996 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1724 if (dir_crossmount || (st_top.st_dev == st.st_dev))
997 scanelf_dir(buf); 1725 ret = scanelf_dirat(dir_fd, buf);
998 }
999 } 1726 }
1000 } 1727 }
1001 closedir(dir); 1728 closedir(dir);
1002}
1003 1729
1730 return ret;
1731}
1732static int scanelf_dir(const char *path)
1733{
1734 return scanelf_dirat(root_fd, root_rel_path(path));
1735}
1736
1004static int scanelf_from_file(char *filename) 1737static int scanelf_from_file(const char *filename)
1005{ 1738{
1006 FILE *fp = NULL; 1739 FILE *fp;
1007 char *p; 1740 char *p, *path;
1008 char path[_POSIX_PATH_MAX]; 1741 size_t len;
1742 int ret;
1009 1743
1010 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL)) 1744 if (strcmp(filename, "-") == 0)
1011 fp = stdin; 1745 fp = stdin;
1012 else if ((fp = fopen(filename, "r")) == NULL) 1746 else if ((fp = fopen(filename, "r")) == NULL)
1013 return 1; 1747 return 1;
1014 1748
1015 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1749 path = NULL;
1750 len = 0;
1751 ret = 0;
1752 while (getline(&path, &len, fp) != -1) {
1016 if ((p = strchr(path, '\n')) != NULL) 1753 if ((p = strchr(path, '\n')) != NULL)
1017 *p = 0; 1754 *p = 0;
1018 search_path = path; 1755 search_path = path;
1019 scanelf_dir(path); 1756 ret = scanelf_dir(path);
1020 } 1757 }
1758 free(path);
1759
1021 if (fp != stdin) 1760 if (fp != stdin)
1022 fclose(fp); 1761 fclose(fp);
1762
1023 return 0; 1763 return ret;
1024} 1764}
1025 1765
1026static void load_ld_so_conf() 1766#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1767
1768static int _load_ld_cache_config(const char *fname)
1027{ 1769{
1028 FILE *fp = NULL; 1770 FILE *fp = NULL;
1029 char *p; 1771 char *p, *path;
1030 char path[_POSIX_PATH_MAX]; 1772 size_t len;
1031 int i = 0; 1773 int curr_fd = -1;
1032 1774
1033 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1775 fp = fopenat_r(root_fd, root_rel_path(fname));
1776 if (fp == NULL)
1034 return; 1777 return -1;
1035 1778
1036 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1779 path = NULL;
1037 if (*path != '/') 1780 len = 0;
1038 continue; 1781 while (getline(&path, &len, fp) != -1) {
1039
1040 if ((p = strrchr(path, '\r')) != NULL) 1782 if ((p = strrchr(path, '\r')) != NULL)
1041 *p = 0; 1783 *p = 0;
1042 if ((p = strchr(path, '\n')) != NULL) 1784 if ((p = strchr(path, '\n')) != NULL)
1043 *p = 0; 1785 *p = 0;
1044 1786
1045 ldpaths[i++] = xstrdup(path); 1787 /* recursive includes of the same file will make this segfault. */
1788 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1789 glob_t gl;
1790 size_t x;
1791 const char *gpath;
1046 1792
1047 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths)) 1793 /* re-use existing path buffer ... need to be creative */
1048 break; 1794 if (path[8] != '/')
1795 gpath = memcpy(path + 3, "/etc/", 5);
1796 else
1797 gpath = path + 8;
1798 if (root_fd != AT_FDCWD) {
1799 if (curr_fd == -1) {
1800 curr_fd = open(".", O_RDONLY|O_CLOEXEC);
1801 if (fchdir(root_fd))
1802 errp("unable to change to root dir");
1803 }
1804 gpath = root_rel_path(gpath);
1805 }
1806
1807 if (glob(gpath, 0, NULL, &gl) == 0) {
1808 for (x = 0; x < gl.gl_pathc; ++x) {
1809 /* try to avoid direct loops */
1810 if (strcmp(gl.gl_pathv[x], fname) == 0)
1811 continue;
1812 _load_ld_cache_config(gl.gl_pathv[x]);
1813 }
1814 globfree(&gl);
1815 }
1816
1817 /* failed globs are ignored by glibc */
1818 continue;
1049 } 1819 }
1050 ldpaths[i] = NULL; 1820
1821 if (*path != '/')
1822 continue;
1823
1824 xarraypush_str(ldpaths, path);
1825 }
1826 free(path);
1051 1827
1052 fclose(fp); 1828 fclose(fp);
1829
1830 if (curr_fd != -1) {
1831 if (fchdir(curr_fd))
1832 /* don't care */;
1833 close(curr_fd);
1834 }
1835
1836 return 0;
1837}
1838
1839#elif defined(__FreeBSD__) || defined(__DragonFly__)
1840
1841static int _load_ld_cache_config(const char *fname)
1842{
1843 FILE *fp = NULL;
1844 char *b = NULL, *p;
1845 struct elfhints_hdr hdr;
1846
1847 fp = fopenat_r(root_fd, root_rel_path(fname));
1848 if (fp == NULL)
1849 return -1;
1850
1851 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1852 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1853 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1854 {
1855 fclose(fp);
1856 return -1;
1857 }
1858
1859 b = xmalloc(hdr.dirlistlen + 1);
1860 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1861 fclose(fp);
1862 free(b);
1863 return -1;
1864 }
1865
1866 while ((p = strsep(&b, ":"))) {
1867 if (*p == '\0')
1868 continue;
1869 xarraypush_str(ldpaths, p);
1870 }
1871
1872 free(b);
1873 fclose(fp);
1874 return 0;
1875}
1876
1877#else
1878#ifdef __ELF__
1879#warning Cache config support not implemented for your target
1880#endif
1881static int _load_ld_cache_config(const char *fname)
1882{
1883 return 0;
1884}
1885#endif
1886
1887static void load_ld_cache_config(const char *fname)
1888{
1889 bool scan_l, scan_ul, scan_ull;
1890 size_t n;
1891 const char *ldpath;
1892
1893 _load_ld_cache_config(fname);
1894
1895 scan_l = scan_ul = scan_ull = false;
1896 if (array_cnt(ldpaths)) {
1897 array_for_each(ldpaths, n, ldpath) {
1898 if (!scan_l && !strcmp(ldpath, "/lib")) scan_l = true;
1899 if (!scan_ul && !strcmp(ldpath, "/usr/lib")) scan_ul = true;
1900 if (!scan_ull && !strcmp(ldpath, "/usr/local/lib")) scan_ull = true;
1901 }
1902 }
1903
1904 if (!scan_l) xarraypush_str(ldpaths, "/lib");
1905 if (!scan_ul) xarraypush_str(ldpaths, "/usr/lib");
1906 if (!scan_ull) xarraypush_str(ldpaths, "/usr/local/lib");
1053} 1907}
1054 1908
1055/* scan /etc/ld.so.conf for paths */ 1909/* scan /etc/ld.so.conf for paths */
1056static void scanelf_ldpath() 1910static void scanelf_ldpath(void)
1057{ 1911{
1058 char scan_l, scan_ul, scan_ull; 1912 size_t n;
1059 int i = 0; 1913 const char *ldpath;
1060 1914
1061 if (!ldpaths[0]) 1915 array_for_each(ldpaths, n, ldpath)
1062 err("Unable to load any paths from ld.so.conf");
1063
1064 scan_l = scan_ul = scan_ull = 0;
1065
1066 while (ldpaths[i]) {
1067 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
1068 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
1069 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
1070 scanelf_dir(ldpaths[i]); 1916 scanelf_dir(ldpath);
1071 ++i;
1072 }
1073
1074 if (!scan_l) scanelf_dir("/lib");
1075 if (!scan_ul) scanelf_dir("/usr/lib");
1076 if (!scan_ull) scanelf_dir("/usr/local/lib");
1077} 1917}
1078 1918
1079/* scan env PATH for paths */ 1919/* scan env PATH for paths */
1080static void scanelf_envpath() 1920static void scanelf_envpath(void)
1081{ 1921{
1082 char *path, *p; 1922 char *path, *p;
1083 1923
1084 path = getenv("PATH"); 1924 path = getenv("PATH");
1085 if (!path) 1925 if (!path)
1092 } 1932 }
1093 1933
1094 free(path); 1934 free(path);
1095} 1935}
1096 1936
1097 1937/* usage / invocation handling functions */ /* Free Flags: c d j u w G H J K P Q U W */
1098/* usage / invocation handling functions */
1099#define PARSE_FLAGS "plRmyxetrnLibSs:gN:TaqvF:f:o:BhV" 1938#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZCBhV"
1100#define a_argument required_argument 1939#define a_argument required_argument
1101static struct option const long_opts[] = { 1940static struct option const long_opts[] = {
1102 {"path", no_argument, NULL, 'p'}, 1941 {"path", no_argument, NULL, 'p'},
1103 {"ldpath", no_argument, NULL, 'l'}, 1942 {"ldpath", no_argument, NULL, 'l'},
1943 {"use-ldpath",no_argument, NULL, 129},
1944 {"root", a_argument, NULL, 128},
1104 {"recursive", no_argument, NULL, 'R'}, 1945 {"recursive", no_argument, NULL, 'R'},
1105 {"mount", no_argument, NULL, 'm'}, 1946 {"mount", no_argument, NULL, 'm'},
1106 {"symlink", no_argument, NULL, 'y'}, 1947 {"symlink", no_argument, NULL, 'y'},
1948 {"archives", no_argument, NULL, 'A'},
1949 {"ldcache", no_argument, NULL, 'L'},
1950 {"fix", no_argument, NULL, 'X'},
1951 {"setpax", a_argument, NULL, 'z'},
1107 {"pax", no_argument, NULL, 'x'}, 1952 {"pax", no_argument, NULL, 'x'},
1108 {"header", no_argument, NULL, 'e'}, 1953 {"header", no_argument, NULL, 'e'},
1109 {"textrel", no_argument, NULL, 't'}, 1954 {"textrel", no_argument, NULL, 't'},
1110 {"rpath", no_argument, NULL, 'r'}, 1955 {"rpath", no_argument, NULL, 'r'},
1111 {"needed", no_argument, NULL, 'n'}, 1956 {"needed", no_argument, NULL, 'n'},
1112 {"ldcache", no_argument, NULL, 'L'},
1113 {"interp", no_argument, NULL, 'i'}, 1957 {"interp", no_argument, NULL, 'i'},
1114 {"bind", no_argument, NULL, 'b'}, 1958 {"bind", no_argument, NULL, 'b'},
1115 {"soname", no_argument, NULL, 'S'}, 1959 {"soname", no_argument, NULL, 'S'},
1116 {"symbol", a_argument, NULL, 's'}, 1960 {"symbol", a_argument, NULL, 's'},
1961 {"section", a_argument, NULL, 'k'},
1117 {"lib", a_argument, NULL, 'N'}, 1962 {"lib", a_argument, NULL, 'N'},
1118 {"gmatch", no_argument, NULL, 'g'}, 1963 {"gmatch", no_argument, NULL, 'g'},
1119 {"textrels", no_argument, NULL, 'T'}, 1964 {"textrels", no_argument, NULL, 'T'},
1965 {"etype", a_argument, NULL, 'E'},
1966 {"bits", a_argument, NULL, 'M'},
1967 {"endian", no_argument, NULL, 'D'},
1968 {"osabi", no_argument, NULL, 'I'},
1969 {"eabi", no_argument, NULL, 'Y'},
1970 {"perms", a_argument, NULL, 'O'},
1971 {"size", no_argument, NULL, 'Z'},
1120 {"all", no_argument, NULL, 'a'}, 1972 {"all", no_argument, NULL, 'a'},
1121 {"quiet", no_argument, NULL, 'q'}, 1973 {"quiet", no_argument, NULL, 'q'},
1122 {"verbose", no_argument, NULL, 'v'}, 1974 {"verbose", no_argument, NULL, 'v'},
1123 {"format", a_argument, NULL, 'F'}, 1975 {"format", a_argument, NULL, 'F'},
1124 {"from", a_argument, NULL, 'f'}, 1976 {"from", a_argument, NULL, 'f'},
1125 {"file", a_argument, NULL, 'o'}, 1977 {"file", a_argument, NULL, 'o'},
1978 {"nocolor", no_argument, NULL, 'C'},
1126 {"nobanner", no_argument, NULL, 'B'}, 1979 {"nobanner", no_argument, NULL, 'B'},
1127 {"help", no_argument, NULL, 'h'}, 1980 {"help", no_argument, NULL, 'h'},
1128 {"version", no_argument, NULL, 'V'}, 1981 {"version", no_argument, NULL, 'V'},
1129 {NULL, no_argument, NULL, 0x0} 1982 {NULL, no_argument, NULL, 0x0}
1130}; 1983};
1131 1984
1132static const char *opts_help[] = { 1985static const char * const opts_help[] = {
1133 "Scan all directories in PATH environment", 1986 "Scan all directories in PATH environment",
1134 "Scan all directories in /etc/ld.so.conf", 1987 "Scan all directories in /etc/ld.so.conf",
1988 "Use ld.so.conf to show full path (use with -r/-n)",
1989 "Root directory (use with -l or -p)",
1135 "Scan directories recursively", 1990 "Scan directories recursively",
1136 "Don't recursively cross mount points", 1991 "Don't recursively cross mount points",
1137 "Don't scan symlinks\n", 1992 "Don't scan symlinks",
1993 "Scan archives (.a files)",
1994 "Utilize ld.so.cache to show full path (use with -r/-n)",
1995 "Try and 'fix' bad things (use with -r/-e)",
1996 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1138 "Print PaX markings", 1997 "Print PaX markings",
1139 "Print GNU_STACK/PT_LOAD markings", 1998 "Print GNU_STACK/PT_LOAD markings",
1140 "Print TEXTREL information", 1999 "Print TEXTREL information",
1141 "Print RPATH information", 2000 "Print RPATH information",
1142 "Print NEEDED information", 2001 "Print NEEDED information",
1143 "Resolve NEEDED information (use with -n)",
1144 "Print INTERP information", 2002 "Print INTERP information",
1145 "Print BIND information", 2003 "Print BIND information",
1146 "Print SONAME information", 2004 "Print SONAME information",
1147 "Find a specified symbol", 2005 "Find a specified symbol",
2006 "Find a specified section",
1148 "Find a specified library", 2007 "Find a specified library",
1149 "Use strncmp to match libraries. (use with -N)", 2008 "Use regex rather than string compare (with -s); specify twice for case insensitive",
1150 "Locate cause of TEXTREL", 2009 "Locate cause of TEXTREL",
1151 "Print all scanned info (-x -e -t -r -b)\n", 2010 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
2011 "Print only ELF files matching numeric bits",
2012 "Print Endianness",
2013 "Print OSABI",
2014 "Print EABI (EM_ARM Only)",
2015 "Print only ELF files matching octal permissions",
2016 "Print ELF file size",
2017 "Print all useful/simple info\n",
1152 "Only output 'bad' things", 2018 "Only output 'bad' things",
1153 "Be verbose (can be specified more than once)", 2019 "Be verbose (can be specified more than once)",
1154 "Use specified format for output", 2020 "Use specified format for output",
1155 "Read input stream from a filename", 2021 "Read input stream from a filename",
1156 "Write output stream to a filename", 2022 "Write output stream to a filename",
2023 "Don't emit color in output",
1157 "Don't display the header", 2024 "Don't display the header",
1158 "Print this help and exit", 2025 "Print this help and exit",
1159 "Print version and exit", 2026 "Print version and exit",
1160 NULL 2027 NULL
1161}; 2028};
1163/* display usage and exit */ 2030/* display usage and exit */
1164static void usage(int status) 2031static void usage(int status)
1165{ 2032{
1166 unsigned long i; 2033 unsigned long i;
1167 printf("* Scan ELF binaries for stuff\n\n" 2034 printf("* Scan ELF binaries for stuff\n\n"
1168 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0); 2035 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1169 printf("Options: -[%s]\n", PARSE_FLAGS); 2036 printf("Options: -[%s]\n", PARSE_FLAGS);
1170 for (i = 0; long_opts[i].name; ++i) 2037 for (i = 0; long_opts[i].name; ++i) {
2038 /* first output the short flag if it has one */
2039 if (long_opts[i].val > '~')
2040 printf(" ");
2041 else
2042 printf(" -%c, ", long_opts[i].val);
2043
2044 /* then the long flag */
1171 if (long_opts[i].has_arg == no_argument) 2045 if (long_opts[i].has_arg == no_argument)
1172 printf(" -%c, --%-13s* %s\n", long_opts[i].val, 2046 printf("--%-14s", long_opts[i].name);
1173 long_opts[i].name, opts_help[i]);
1174 else 2047 else
1175 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val, 2048 printf("--%-7s <arg> ", long_opts[i].name);
1176 long_opts[i].name, opts_help[i]);
1177 2049
1178 if (status != EXIT_SUCCESS) 2050 /* finally the help text */
1179 exit(status); 2051 printf("* %s\n", opts_help[i]);
2052 }
1180 2053
1181 puts("\nThe format modifiers for the -F option are:"); 2054 puts("\nFor more information, see the scanelf(1) manpage");
1182 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1183 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1184 puts(" i INTERP \tb BIND \ts symbol");
1185 puts(" N library \to Type \tT TEXTRELs");
1186 puts(" S SONAME");
1187 puts(" p filename (with search path removed)");
1188 puts(" f filename (short name/basename)");
1189 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1190
1191 exit(status); 2055 exit(status);
1192} 2056}
1193 2057
1194/* parse command line arguments and preform needed actions */ 2058/* parse command line arguments and preform needed actions */
2059#define do_pax_state(option, flag) \
2060 if (islower(option)) { \
2061 flags &= ~PF_##flag; \
2062 flags |= PF_NO##flag; \
2063 } else { \
2064 flags &= ~PF_NO##flag; \
2065 flags |= PF_##flag; \
2066 }
1195static void parseargs(int argc, char *argv[]) 2067static int parseargs(int argc, char *argv[])
1196{ 2068{
1197 int i; 2069 int i;
1198 char *from_file = NULL; 2070 const char *from_file = NULL;
2071 int ret = 0;
2072 char load_cache_config = 0;
1199 2073
1200 opterr = 0; 2074 opterr = 0;
1201 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 2075 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1202 switch (i) { 2076 switch (i) {
1203 2077
1207 VERSION, __FILE__, __DATE__, rcsid, argv0); 2081 VERSION, __FILE__, __DATE__, rcsid, argv0);
1208 exit(EXIT_SUCCESS); 2082 exit(EXIT_SUCCESS);
1209 break; 2083 break;
1210 case 'h': usage(EXIT_SUCCESS); break; 2084 case 'h': usage(EXIT_SUCCESS); break;
1211 case 'f': 2085 case 'f':
1212 if (from_file) err("Don't specify -f twice"); 2086 if (from_file) warn("You prob don't want to specify -f twice");
1213 from_file = xstrdup(optarg); 2087 from_file = optarg;
2088 break;
2089 case 'E':
2090 match_etypes = optarg;
2091 break;
2092 case 'M':
2093 match_bits = atoi(optarg);
2094 if (match_bits == 0) {
2095 if (strcmp(optarg, "ELFCLASS32") == 0)
2096 match_bits = 32;
2097 if (strcmp(optarg, "ELFCLASS64") == 0)
2098 match_bits = 64;
2099 }
2100 break;
2101 case 'O':
2102 if (sscanf(optarg, "%o", &match_perms) == -1)
2103 match_bits = 0;
1214 break; 2104 break;
1215 case 'o': { 2105 case 'o': {
1216 FILE *fp = NULL;
1217 if ((fp = freopen(optarg, "w", stdout)) == NULL) 2106 if (freopen(optarg, "w", stdout) == NULL)
1218 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 2107 errp("Could not freopen(%s)", optarg);
1219 SET_STDOUT(fp);
1220 break; 2108 break;
1221 } 2109 }
1222 2110 case 'k':
2111 xarraypush_str(find_section_arr, optarg);
2112 break;
1223 case 's': { 2113 case 's': {
1224 if (find_sym) warn("You prob don't want to specify -s twice"); 2114 /* historically, this was comma delimited */
1225 find_sym = optarg; 2115 char *this_sym = strtok(optarg, ",");
1226 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1)); 2116 if (!this_sym) /* edge case: -s '' */
1227 sprintf(versioned_symname, "%s@", find_sym); 2117 xarraypush_str(find_sym_arr, "");
2118 while (this_sym) {
2119 xarraypush_str(find_sym_arr, this_sym);
2120 this_sym = strtok(NULL, ",");
2121 }
1228 break; 2122 break;
1229 } 2123 }
1230 case 'N': { 2124 case 'N':
1231 if (find_lib) warn("You prob don't want to specify -N twice"); 2125 xarraypush_str(find_lib_arr, optarg);
1232 find_lib = optarg;
1233 break; 2126 break;
1234 }
1235
1236 case 'F': { 2127 case 'F': {
1237 if (out_format) warn("You prob don't want to specify -F twice"); 2128 if (out_format) warn("You prob don't want to specify -F twice");
1238 out_format = optarg; 2129 out_format = optarg;
1239 break; 2130 break;
1240 } 2131 }
2132 case 'z': {
2133 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
2134 size_t x;
1241 2135
1242 case 'g': gmatch = 1; /* break; any reason we dont breal; here ? */ 2136 for (x = 0; x < strlen(optarg); x++) {
1243 case 'L': printcache = 1; break; 2137 switch (optarg[x]) {
2138 case 'p':
2139 case 'P':
2140 do_pax_state(optarg[x], PAGEEXEC);
2141 break;
2142 case 's':
2143 case 'S':
2144 do_pax_state(optarg[x], SEGMEXEC);
2145 break;
2146 case 'm':
2147 case 'M':
2148 do_pax_state(optarg[x], MPROTECT);
2149 break;
2150 case 'e':
2151 case 'E':
2152 do_pax_state(optarg[x], EMUTRAMP);
2153 break;
2154 case 'r':
2155 case 'R':
2156 do_pax_state(optarg[x], RANDMMAP);
2157 break;
2158 case 'x':
2159 case 'X':
2160 do_pax_state(optarg[x], RANDEXEC);
2161 break;
2162 default:
2163 break;
2164 }
2165 }
2166 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
2167 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
2168 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
2169 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
2170 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
2171 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
2172 setpax = flags;
2173 break;
2174 }
2175 case 'Z': show_size = 1; break;
2176 case 'g': ++g_match; break;
2177 case 'L': load_cache_config = use_ldcache = 1; break;
1244 case 'y': scan_symlink = 0; break; 2178 case 'y': scan_symlink = 0; break;
2179 case 'A': scan_archives = 1; break;
2180 case 'C': color_init(true); break;
1245 case 'B': show_banner = 0; break; 2181 case 'B': show_banner = 0; break;
1246 case 'l': scan_ldpath = 1; break; 2182 case 'l': load_cache_config = scan_ldpath = 1; break;
1247 case 'p': scan_envpath = 1; break; 2183 case 'p': scan_envpath = 1; break;
1248 case 'R': dir_recurse = 1; break; 2184 case 'R': dir_recurse = 1; break;
1249 case 'm': dir_crossmount = 0; break; 2185 case 'm': dir_crossmount = 0; break;
2186 case 'X': ++fix_elf; break;
1250 case 'x': show_pax = 1; break; 2187 case 'x': show_pax = 1; break;
1251 case 'e': show_phdr = 1; break; 2188 case 'e': show_phdr = 1; break;
1252 case 't': show_textrel = 1; break; 2189 case 't': show_textrel = 1; break;
1253 case 'r': show_rpath = 1; break; 2190 case 'r': show_rpath = 1; break;
1254 case 'n': show_needed = 1; break; 2191 case 'n': show_needed = 1; break;
1255 case 'i': show_interp = 1; break; 2192 case 'i': show_interp = 1; break;
1256 case 'b': show_bind = 1; break; 2193 case 'b': show_bind = 1; break;
1257 case 'S': show_soname = 1; break; 2194 case 'S': show_soname = 1; break;
1258 case 'T': show_textrels = 1; break; 2195 case 'T': show_textrels = 1; break;
1259 case 'q': be_quiet = 1; break; 2196 case 'q': be_quiet = min(be_quiet, 20) + 1; break;
1260 case 'v': be_verbose = (be_verbose % 20) + 1; break; 2197 case 'v': be_verbose = min(be_verbose, 20) + 1; break;
1261 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break; 2198 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
1262 2199 case 'D': show_endian = 1; break;
2200 case 'I': show_osabi = 1; break;
2201 case 'Y': show_eabi = 1; break;
2202 case 128:
2203 root_fd = open(optarg, O_RDONLY|O_CLOEXEC);
2204 if (root_fd == -1)
2205 err("Could not open root: %s", optarg);
2206 break;
2207 case 129: load_cache_config = use_ldpath = 1; break;
1263 case ':': 2208 case ':':
1264 err("Option missing parameter\n"); 2209 err("Option '%c' is missing parameter", optopt);
1265 case '?': 2210 case '?':
1266 err("Unknown option\n"); 2211 err("Unknown option '%c' or argument missing", optopt);
1267 default: 2212 default:
1268 err("Unhandled option '%c'", i); 2213 err("Unhandled option '%c'; please report this", i);
2214 }
2215 }
2216 if (show_textrels && be_verbose)
2217 has_objdump = bin_in_path("objdump");
2218 /* precompile all the regexes */
2219 if (g_match) {
2220 regex_t preg;
2221 const char *this_sym;
2222 size_t n;
2223 int flags = REG_EXTENDED | REG_NOSUB | (g_match > 1 ? REG_ICASE : 0);
2224
2225 array_for_each(find_sym_arr, n, this_sym) {
2226 /* see scanelf_match_symname for logic info */
2227 switch (this_sym[0]) {
2228 case '%':
2229 while (*(this_sym++))
2230 if (*this_sym == '%') {
2231 ++this_sym;
2232 break;
2233 }
2234 break;
2235 case '+':
2236 case '-':
2237 ++this_sym;
2238 break;
1269 } 2239 }
2240 if (*this_sym == '*')
2241 ++this_sym;
2242
2243 ret = regcomp(&preg, this_sym, flags);
2244 if (ret) {
2245 char err[256];
2246 regerror(ret, &preg, err, sizeof(err));
2247 err("regcomp of %s failed: %s", this_sym, err);
2248 }
2249 xarraypush(find_sym_regex_arr, &preg, sizeof(preg));
1270 } 2250 }
1271 2251 }
2252 /* flatten arrays for display */
2253 if (array_cnt(find_sym_arr))
2254 find_sym = array_flatten_str(find_sym_arr);
2255 if (array_cnt(find_lib_arr))
2256 find_lib = array_flatten_str(find_lib_arr);
2257 if (array_cnt(find_section_arr))
2258 find_section = array_flatten_str(find_section_arr);
1272 /* let the format option override all other options */ 2259 /* let the format option override all other options */
1273 if (out_format) { 2260 if (out_format) {
1274 show_pax = show_phdr = show_textrel = show_rpath = \ 2261 show_pax = show_phdr = show_textrel = show_rpath = \
1275 show_needed = show_interp = show_bind = show_soname = \ 2262 show_needed = show_interp = show_bind = show_soname = \
1276 show_textrels = 0; 2263 show_textrels = show_perms = show_endian = show_size = \
2264 show_osabi = show_eabi = 0;
1277 for (i = 0; out_format[i]; ++i) { 2265 for (i = 0; out_format[i]; ++i) {
1278 if (!IS_MODIFIER(out_format[i])) continue; 2266 if (!IS_MODIFIER(out_format[i])) continue;
1279 2267
1280 switch (out_format[++i]) { 2268 switch (out_format[++i]) {
2269 case '+': break;
1281 case '%': break; 2270 case '%': break;
1282 case '#': break; 2271 case '#': break;
1283 case 'F': break; 2272 case 'F': break;
1284 case 'p': break; 2273 case 'p': break;
1285 case 'f': break; 2274 case 'f': break;
2275 case 'k': break;
1286 case 's': break; 2276 case 's': break;
1287 case 'N': break; 2277 case 'N': break;
1288 case 'o': break; 2278 case 'o': break;
2279 case 'a': break;
2280 case 'M': break;
2281 case 'Z': show_size = 1; break;
2282 case 'D': show_endian = 1; break;
2283 case 'I': show_osabi = 1; break;
2284 case 'Y': show_eabi = 1; break;
2285 case 'O': show_perms = 1; break;
1289 case 'x': show_pax = 1; break; 2286 case 'x': show_pax = 1; break;
1290 case 'e': show_phdr = 1; break; 2287 case 'e': show_phdr = 1; break;
1291 case 't': show_textrel = 1; break; 2288 case 't': show_textrel = 1; break;
1292 case 'r': show_rpath = 1; break; 2289 case 'r': show_rpath = 1; break;
1293 case 'n': show_needed = 1; break; 2290 case 'n': show_needed = 1; break;
1294 case 'i': show_interp = 1; break; 2291 case 'i': show_interp = 1; break;
1295 case 'b': show_bind = 1; break; 2292 case 'b': show_bind = 1; break;
1296 case 'S': show_soname = 1; break; 2293 case 'S': show_soname = 1; break;
1297 case 'T': show_textrels = 1; break; 2294 case 'T': show_textrels = 1; break;
1298 default: 2295 default:
1299 err("Invalid format specifier '%c' (byte %i)", 2296 err("invalid format specifier '%c' (byte %i)",
1300 out_format[i], i+1); 2297 out_format[i], i+1);
1301 } 2298 }
1302 } 2299 }
1303 2300
1304 /* construct our default format */ 2301 /* construct our default format */
1305 } else { 2302 } else {
1306 size_t fmt_len = 30; 2303 size_t fmt_len = 30;
1307 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 2304 out_format = xmalloc(sizeof(char) * fmt_len);
2305 *out_format = '\0';
1308 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 2306 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1309 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len); 2307 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
2308 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
2309 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
2310 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
2311 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
2312 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
1310 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len); 2313 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1311 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 2314 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1312 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 2315 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1313 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 2316 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1314 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 2317 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1315 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len); 2318 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1316 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len); 2319 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1317 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len); 2320 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1318 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len); 2321 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
2322 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1319 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len); 2323 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1320 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 2324 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1321 } 2325 }
1322 if (be_verbose > 2) printf("Format: %s\n", out_format); 2326 if (be_verbose > 2) printf("Format: %s\n", out_format);
1323 2327
1324 /* now lets actually do the scanning */ 2328 /* now lets actually do the scanning */
1325 if (scan_ldpath || (show_rpath && be_quiet)) 2329 if (load_cache_config)
1326 load_ld_so_conf(); 2330 load_ld_cache_config(__PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
1327 if (scan_ldpath) scanelf_ldpath(); 2331 if (scan_ldpath) scanelf_ldpath();
1328 if (scan_envpath) scanelf_envpath(); 2332 if (scan_envpath) scanelf_envpath();
2333 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
2334 from_file = "-";
1329 if (from_file) { 2335 if (from_file) {
1330 scanelf_from_file(from_file); 2336 scanelf_from_file(from_file);
1331 free(from_file);
1332 from_file = *argv; 2337 from_file = *argv;
1333 } 2338 }
1334 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file) 2339 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1335 err("Nothing to scan !?"); 2340 err("Nothing to scan !?");
1336 while (optind < argc) { 2341 while (optind < argc) {
1337 search_path = argv[optind++]; 2342 search_path = argv[optind++];
1338 scanelf_dir(search_path); 2343 ret = scanelf_dir(search_path);
1339 } 2344 }
1340 2345
2346#ifdef __PAX_UTILS_CLEANUP
1341 /* clean up */ 2347 /* clean up */
1342 if (versioned_symname) free(versioned_symname);
1343 for (i = 0; ldpaths[i]; ++i)
1344 free(ldpaths[i]); 2348 xarrayfree(ldpaths);
2349 xarrayfree(find_sym_arr);
2350 xarrayfree(find_lib_arr);
2351 xarrayfree(find_section_arr);
2352 free(find_sym);
2353 free(find_lib);
2354 free(find_section);
2355 {
2356 size_t n;
2357 regex_t *preg;
2358 array_for_each(find_sym_regex_arr, n, preg)
2359 regfree(preg);
2360 xarrayfree(find_sym_regex_arr);
2361 }
1345 2362
1346 if (ldcache != 0) 2363 if (ldcache != 0)
1347 munmap(ldcache, ldcache_size); 2364 munmap(ldcache, ldcache_size);
1348} 2365#endif
1349 2366
1350
1351
1352/* utility funcs */
1353static char *xstrdup(const char *s)
1354{
1355 char *ret = strdup(s);
1356 if (!ret) err("Could not strdup(): %s", strerror(errno));
1357 return ret; 2367 return ret;
1358} 2368}
1359static void *xmalloc(size_t size)
1360{
1361 void *ret = malloc(size);
1362 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1363 return ret;
1364}
1365static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
1366{
1367 size_t new_len;
1368 2369
1369 new_len = strlen(*dst) + strlen(src); 2370static char **get_split_env(const char *envvar)
1370 if (*curr_len <= new_len) {
1371 *curr_len = new_len + (*curr_len / 2);
1372 *dst = realloc(*dst, *curr_len);
1373 if (!*dst)
1374 err("could not realloc() %li bytes", (unsigned long)*curr_len);
1375 }
1376
1377 if (n)
1378 strncat(*dst, src, n);
1379 else
1380 strcat(*dst, src);
1381}
1382static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1383{ 2371{
1384 static char my_app[2]; 2372 const char *delims = " \t\n";
1385 my_app[0] = append; 2373 char **envvals = NULL;
1386 my_app[1] = '\0'; 2374 char *env, *s;
1387 xstrcat(dst, my_app, curr_len); 2375 int nentry;
1388}
1389 2376
2377 if ((env = getenv(envvar)) == NULL)
2378 return NULL;
1390 2379
2380 env = xstrdup(env);
2381 if (env == NULL)
2382 return NULL;
2383
2384 s = strtok(env, delims);
2385 if (s == NULL) {
2386 free(env);
2387 return NULL;
2388 }
2389
2390 nentry = 0;
2391 while (s != NULL) {
2392 ++nentry;
2393 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
2394 envvals[nentry-1] = s;
2395 s = strtok(NULL, delims);
2396 }
2397 envvals[nentry] = NULL;
2398
2399 /* don't want to free(env) as it contains the memory that backs
2400 * the envvals array of strings */
2401 return envvals;
2402}
2403
2404static void parseenv(void)
2405{
2406 color_init(false);
2407 qa_textrels = get_split_env("QA_TEXTRELS");
2408 qa_execstack = get_split_env("QA_EXECSTACK");
2409 qa_wx_load = get_split_env("QA_WX_LOAD");
2410}
2411
2412#ifdef __PAX_UTILS_CLEANUP
2413static void cleanup(void)
2414{
2415 free(out_format);
2416 free(qa_textrels);
2417 free(qa_execstack);
2418 free(qa_wx_load);
2419}
2420#endif
1391 2421
1392int main(int argc, char *argv[]) 2422int main(int argc, char *argv[])
1393{ 2423{
2424 int ret;
1394 if (argc < 2) 2425 if (argc < 2)
1395 usage(EXIT_FAILURE); 2426 usage(EXIT_FAILURE);
2427 parseenv();
1396 parseargs(argc, argv); 2428 ret = parseargs(argc, argv);
1397 fclose(stdout); 2429 fclose(stdout);
1398#ifdef __BOUNDS_CHECKING_ON 2430#ifdef __PAX_UTILS_CLEANUP
1399 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()"); 2431 cleanup();
2432 warn("The calls to add/delete heap should be off:\n"
2433 "\t- 1 due to the out_buffer not being freed in scanelf_fileat()\n"
2434 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
1400#endif 2435#endif
1401 return EXIT_SUCCESS; 2436 return ret;
1402} 2437}
2438
2439/* Match filename against entries in matchlist, return TRUE
2440 * if the file is listed */
2441static int file_matches_list(const char *filename, char **matchlist)
2442{
2443 char **file;
2444 char *match;
2445 char buf[__PAX_UTILS_PATH_MAX];
2446
2447 if (matchlist == NULL)
2448 return 0;
2449
2450 for (file = matchlist; *file != NULL; file++) {
2451 if (search_path) {
2452 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2453 match = buf;
2454 } else {
2455 match = *file;
2456 }
2457 if (fnmatch(match, filename, 0) == 0)
2458 return 1;
2459 }
2460 return 0;
2461}

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