/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.96 Revision 1.249
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 1.249 2012/11/04 08:23:12 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 1.249 2012/11/04 08:23:12 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;
324 int max_pt_load;
157 325
158 if (!show_phdr) return NULL; 326 if (!show_phdr) return NULL;
159 327
160 memcpy(ret, "--- --- ---\0", 12); 328 memcpy(ret, "--- --- ---\0", 12);
161 329
162 shown = 0; 330 shown = 0;
163 multi_stack = multi_relro = multi_load = 0; 331 multi_stack = multi_relro = multi_load = 0;
332 max_pt_load = elf_max_pt_load(elf);
164 333
334#define NOTE_GNU_STACK ".note.GNU-stack"
165#define SHOW_PHDR(B) \ 335#define SHOW_PHDR(B) \
166 if (elf->elf_class == ELFCLASS ## B) { \ 336 if (elf->elf_class == ELFCLASS ## B) { \
167 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 337 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
168 Elf ## B ## _Off offset; \ 338 Elf ## B ## _Off offset; \
169 uint32_t flags, check_flags; \ 339 uint32_t flags, check_flags; \
170 if (elf->phdr != NULL) { \ 340 if (elf->phdr != NULL) { \
171 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 341 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
172 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \ 342 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
173 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \ 343 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
344 if (multi_stack++) \
174 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \ 345 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
346 if (file_matches_list(elf->filename, qa_execstack)) \
347 continue; \
175 found = found_phdr; \ 348 found = found_phdr; \
176 offset = 0; \ 349 offset = 0; \
177 check_flags = PF_X; \ 350 check_flags = PF_X; \
178 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \ 351 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
352 if (multi_relro++) \
179 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \ 353 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
180 found = found_relro; \ 354 found = found_relro; \
181 offset = 4; \ 355 offset = 4; \
182 check_flags = PF_X; \ 356 check_flags = PF_X; \
183 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \ 357 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
184 if (multi_load++ > 2) warnf("%s: more than 2 PT_LOAD's !?", elf->filename); \ 358 if (EGET(ehdr->e_type) == ET_DYN || EGET(ehdr->e_type) == ET_EXEC) \
359 if (multi_load++ > max_pt_load) \
360 warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
361 if (file_matches_list(elf->filename, qa_wx_load)) \
362 continue; \
185 found = found_load; \ 363 found = found_load; \
186 offset = 8; \ 364 offset = 8; \
187 check_flags = PF_W|PF_X; \ 365 check_flags = PF_W|PF_X; \
188 } else \ 366 } else \
189 continue; \ 367 continue; \
190 flags = EGET(phdr[i].p_flags); \ 368 flags = EGET(phdr[i].p_flags); \
191 if (be_quiet && ((flags & check_flags) != check_flags)) \ 369 if (be_quiet && ((flags & check_flags) != check_flags)) \
192 continue; \ 370 continue; \
371 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
372 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
373 ret[3] = ret[7] = '!'; \
374 flags = EGET(phdr[i].p_flags); \
375 } \
193 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \ 376 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
194 *found = 1; \ 377 *found = 1; \
195 ++shown; \ 378 ++shown; \
196 } \ 379 } \
197 } else if (elf->shdr != NULL) { \ 380 } else if (elf->shdr != NULL) { \
198 /* no program headers which means this is prob an object file */ \ 381 /* no program headers which means this is prob an object file */ \
199 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \ 382 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
200 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \ 383 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
384 char *str; \
385 if ((void*)strtbl > elf->data_end) \
386 goto skip_this_shdr##B; \
201 check_flags = SHF_WRITE|SHF_EXECINSTR; \ 387 check_flags = SHF_WRITE|SHF_EXECINSTR; \
202 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \ 388 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
203 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \ 389 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
204 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \ 390 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
205 if (!strcmp((char*)(elf->data + offset), ".note.GNU-stack")) { \ 391 str = elf->data + offset; \
392 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
393 if (!strcmp(str, NOTE_GNU_STACK)) { \
206 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \ 394 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
207 flags = EGET(shdr[i].sh_flags); \ 395 flags = EGET(shdr[i].sh_flags); \
208 if (be_quiet && ((flags & check_flags) != check_flags)) \ 396 if (be_quiet && ((flags & check_flags) != check_flags)) \
209 continue; \ 397 continue; \
210 ++*found_phdr; \ 398 ++*found_phdr; \
214 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \ 402 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
215 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \ 403 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
216 break; \ 404 break; \
217 } \ 405 } \
218 } \ 406 } \
407 skip_this_shdr##B: \
219 if (!multi_stack) { \ 408 if (!multi_stack) { \
409 if (file_matches_list(elf->filename, qa_execstack)) \
410 return NULL; \
220 *found_phdr = 1; \ 411 *found_phdr = 1; \
221 shown = 1; \ 412 shown = 1; \
222 memcpy(ret, "!WX", 3); \ 413 memcpy(ret, "!WX", 3); \
223 } \ 414 } \
224 } \ 415 } \
229 if (be_wewy_wewy_quiet || (be_quiet && !shown)) 420 if (be_wewy_wewy_quiet || (be_quiet && !shown))
230 return NULL; 421 return NULL;
231 else 422 else
232 return ret; 423 return ret;
233} 424}
425
426/*
427 * See if this ELF contains a DT_TEXTREL tag in any of its
428 * PT_DYNAMIC sections.
429 */
234static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 430static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
235{ 431{
236 static const char *ret = "TEXTREL"; 432 static const char *ret = "TEXTREL";
237 unsigned long i; 433 unsigned long i;
238 434
239 if (!show_textrel && !show_textrels) return NULL; 435 if (!show_textrel && !show_textrels) return NULL;
436
437 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
240 438
241 if (elf->phdr) { 439 if (elf->phdr) {
242#define SHOW_TEXTREL(B) \ 440#define SHOW_TEXTREL(B) \
243 if (elf->elf_class == ELFCLASS ## B) { \ 441 if (elf->elf_class == ELFCLASS ## B) { \
244 Elf ## B ## _Dyn *dyn; \ 442 Elf ## B ## _Dyn *dyn; \
245 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 443 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
246 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 444 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
247 Elf ## B ## _Off offset; \ 445 Elf ## B ## _Off offset; \
248 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 446 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
249 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 447 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
250 offset = EGET(phdr[i].p_offset); \ 448 offset = EGET(phdr[i].p_offset); \
251 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 449 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
252 dyn = DYN ## B (elf->data + offset); \ 450 dyn = DYN ## B (elf->vdata + offset); \
253 while (EGET(dyn->d_tag) != DT_NULL) { \ 451 while (EGET(dyn->d_tag) != DT_NULL) { \
254 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \ 452 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
255 *found_textrel = 1; \ 453 *found_textrel = 1; \
256 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \ 454 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
257 return (be_wewy_wewy_quiet ? NULL : ret); \ 455 return (be_wewy_wewy_quiet ? NULL : ret); \
266 if (be_quiet || be_wewy_wewy_quiet) 464 if (be_quiet || be_wewy_wewy_quiet)
267 return NULL; 465 return NULL;
268 else 466 else
269 return " - "; 467 return " - ";
270} 468}
469
470/*
471 * Scan the .text section to see if there are any relocations in it.
472 * Should rewrite this to check PT_LOAD sections that are marked
473 * Executable rather than the section named '.text'.
474 */
271static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel) 475static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
272{ 476{
273 unsigned long s, r, rmax; 477 unsigned long s, r, rmax;
274 void *symtab_void, *strtab_void, *text_void; 478 void *symtab_void, *strtab_void, *text_void;
275 479
296 Elf ## B ## _Rela *rela; \ 500 Elf ## B ## _Rela *rela; \
297 /* search the section headers for relocations */ \ 501 /* search the section headers for relocations */ \
298 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \ 502 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
299 uint32_t sh_type = EGET(shdr[s].sh_type); \ 503 uint32_t sh_type = EGET(shdr[s].sh_type); \
300 if (sh_type == SHT_REL) { \ 504 if (sh_type == SHT_REL) { \
301 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \ 505 rel = REL ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
302 rela = NULL; \ 506 rela = NULL; \
303 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \ 507 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
304 } else if (sh_type == SHT_RELA) { \ 508 } else if (sh_type == SHT_RELA) { \
305 rel = NULL; \ 509 rel = NULL; \
306 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \ 510 rela = RELA ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
307 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \ 511 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
308 } else \ 512 } else \
309 continue; \ 513 continue; \
310 /* now see if any of the relocs are in the .text */ \ 514 /* now see if any of the relocs are in the .text */ \
311 for (r = 0; r < rmax; ++r) { \ 515 for (r = 0; r < rmax; ++r) { \
326 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \ 530 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
327 if (be_verbose <= 2) continue; \ 531 if (be_verbose <= 2) continue; \
328 } else \ 532 } else \
329 *found_textrels = 1; \ 533 *found_textrels = 1; \
330 /* locate this relocation symbol name */ \ 534 /* locate this relocation symbol name */ \
331 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 535 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
536 if ((void*)sym > elf->data_end) { \
537 warn("%s: corrupt ELF symbol", elf->filename); \
538 continue; \
539 } \
332 sym_max = ELF ## B ## _R_SYM(r_info); \ 540 sym_max = ELF ## B ## _R_SYM(r_info); \
333 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \ 541 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
334 sym += sym_max; \ 542 sym += sym_max; \
335 else \ 543 else \
336 sym = NULL; \ 544 sym = NULL; \
337 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 545 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
338 /* show the raw details about this reloc */ \ 546 /* show the raw details about this reloc */ \
339 printf(" %s: ", elf->base_filename); \ 547 printf(" %s: ", elf->base_filename); \
340 if (sym && sym->st_name) \ 548 if (sym && sym->st_name) \
341 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \ 549 printf("%s", elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
342 else \ 550 else \
343 printf("(memory/fake?)"); \ 551 printf("(memory/data?)"); \
344 printf(" [0x%lX]", (unsigned long)r_offset); \ 552 printf(" [0x%lX]", (unsigned long)r_offset); \
345 /* now try to find the closest symbol that this rel is probably in */ \ 553 /* now try to find the closest symbol that this rel is probably in */ \
346 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 554 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
347 func = NULL; \ 555 func = NULL; \
348 offset_tmp = 0; \ 556 offset_tmp = 0; \
349 while (sym_max--) { \ 557 while (sym_max--) { \
350 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \ 558 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
351 func = sym; \ 559 func = sym; \
352 offset_tmp = EGET(sym->st_value); \ 560 offset_tmp = EGET(sym->st_value); \
353 } \ 561 } \
354 ++sym; \ 562 ++sym; \
355 } \ 563 } \
356 printf(" in "); \ 564 printf(" in "); \
357 if (func && func->st_name) \ 565 if (func && func->st_name) { \
358 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \ 566 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
567 if (r_offset > EGET(func->st_size)) \
568 printf("(optimized out: previous %s)", func_name); \
359 else \ 569 else \
360 printf("(NULL: fake?)"); \ 570 printf("%s", func_name); \
571 } else \
572 printf("(optimized out)"); \
361 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \ 573 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
574 if (be_verbose && has_objdump) { \
575 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
576 char *sysbuf; \
577 size_t syslen; \
578 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"; \
579 syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
580 sysbuf = xmalloc(syslen); \
581 if (end_addr < r_offset) \
582 /* not uncommon when things are optimized out */ \
583 end_addr = r_offset + 0x100; \
584 snprintf(sysbuf, syslen, sysfmt, \
585 (unsigned long)offset_tmp, \
586 (unsigned long)end_addr, \
587 elf->filename, \
588 (unsigned long)r_offset); \
589 fflush(stdout); \
590 if (system(sysbuf)) /* don't care */; \
591 fflush(stdout); \
592 free(sysbuf); \
593 } \
362 } \ 594 } \
363 } } 595 } }
364 SHOW_TEXTRELS(32) 596 SHOW_TEXTRELS(32)
365 SHOW_TEXTRELS(64) 597 SHOW_TEXTRELS(64)
366 } 598 }
368 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename); 600 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
369 601
370 return NULL; 602 return NULL;
371} 603}
372 604
373static void rpath_security_checks(elfobj *, char *);
374static void rpath_security_checks(elfobj *elf, char *item) { 605static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
606{
375 struct stat st; 607 struct stat st;
376 switch (*item) { 608 switch (*item) {
377 case '/': break; 609 case '/': break;
378 case '.': 610 case '.':
379 warnf("Security problem with relative RPATH '%s' in %s", item, elf->filename); 611 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
380 break; 612 break;
613 case ':':
381 case '\0': 614 case '\0':
382 warnf("Security problem NULL RPATH in %s", elf->filename); 615 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
383 break; 616 break;
384 case '$': 617 case '$':
385 if (fstat(elf->fd, &st) != -1) 618 if (fstat(elf->fd, &st) != -1)
386 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID)) 619 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", 620 warnf("Security problem with %s='%s' in %s with mode set of %o",
388 item, elf->filename, st.st_mode & 07777); 621 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
389 break; 622 break;
390 default: 623 default:
391 warnf("Maybe? sec problem with RPATH='%s' in %s", item, elf->filename); 624 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
392 break; 625 break;
393 } 626 }
394} 627}
395static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len) 628static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
396{ 629{
397 unsigned long i, s; 630 unsigned long i;
398 char *rpath, *runpath, **r; 631 char *rpath, *runpath, **r;
399 void *strtbl_void; 632 void *strtbl_void;
400 633
401 if (!show_rpath) return; 634 if (!show_rpath) return;
402 635
413 Elf ## B ## _Off offset; \ 646 Elf ## B ## _Off offset; \
414 Elf ## B ## _Xword word; \ 647 Elf ## B ## _Xword word; \
415 /* Scan all the program headers */ \ 648 /* Scan all the program headers */ \
416 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 649 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
417 /* Just scan dynamic headers */ \ 650 /* Just scan dynamic headers */ \
418 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 651 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
419 offset = EGET(phdr[i].p_offset); \ 652 offset = EGET(phdr[i].p_offset); \
420 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 653 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
421 /* Just scan dynamic RPATH/RUNPATH headers */ \ 654 /* Just scan dynamic RPATH/RUNPATH headers */ \
422 dyn = DYN ## B (elf->data + offset); \ 655 dyn = DYN ## B (elf->vdata + offset); \
423 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \ 656 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
424 if (word == DT_RPATH) { \ 657 if (word == DT_RPATH) { \
425 r = &rpath; \ 658 r = &rpath; \
426 } else if (word == DT_RUNPATH) { \ 659 } else if (word == DT_RUNPATH) { \
427 r = &runpath; \ 660 r = &runpath; \
431 } \ 664 } \
432 /* Verify the memory is somewhat sane */ \ 665 /* Verify the memory is somewhat sane */ \
433 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 666 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
434 if (offset < (Elf ## B ## _Off)elf->len) { \ 667 if (offset < (Elf ## B ## _Off)elf->len) { \
435 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \ 668 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
436 *r = (char*)(elf->data + offset); \ 669 *r = elf->data + offset; \
670 /* cache the length in case we need to nuke this section later on */ \
671 if (fix_elf) \
672 offset = strlen(*r); \
437 /* If quiet, don't output paths in ld.so.conf */ \ 673 /* If quiet, don't output paths in ld.so.conf */ \
438 if (be_quiet) { \ 674 if (be_quiet) { \
439 size_t len; \ 675 size_t len; \
440 char *start, *end; \ 676 char *start, *end; \
441 /* note that we only 'chop' off leading known paths. */ \ 677 /* note that we only 'chop' off leading known paths. */ \
442 /* since *r is read-only memory, we can only move the ptr forward. */ \ 678 /* since *r is read-only memory, we can only move the ptr forward. */ \
443 start = *r; \ 679 start = *r; \
444 /* scan each path in : delimited list */ \ 680 /* scan each path in : delimited list */ \
445 while (start) { \ 681 while (start) { \
446 rpath_security_checks(elf, start); \ 682 rpath_security_checks(elf, start, get_elfdtype(word)); \
447 end = strchr(start, ':'); \ 683 end = strchr(start, ':'); \
448 len = (end ? abs(end - start) : strlen(start)); \ 684 len = (end ? abs(end - start) : strlen(start)); \
449 for (s = 0; ldpaths[s]; ++s) { \ 685 if (use_ldcache) { \
686 size_t n; \
687 const char *ldpath; \
688 array_for_each(ldpaths, n, ldpath) \
450 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \ 689 if (!strncmp(ldpath, start, len) && !ldpath[len]) { \
451 *r = (end ? end + 1 : NULL); \ 690 *r = end; \
691 /* corner case ... if RPATH reads "/usr/lib:", we want \
692 * to show ':' rather than '' */ \
693 if (end && end[1] != '\0') \
694 (*r)++; \
452 break; \ 695 break; \
453 } \ 696 } \
454 } \ 697 } \
455 if (!*r || !ldpaths[s] || !end) \ 698 if (!*r || !end) \
456 start = NULL; \ 699 break; \
457 else \ 700 else \
458 start = start + len + 1; \ 701 start = start + len + 1; \
459 } \ 702 } \
460 } \ 703 } \
704 if (*r) { \
705 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
706 /* just nuke it */ \
707 nuke_it##B: \
708 memset(*r, 0x00, offset); \
709 *r = NULL; \
710 ESET(dyn->d_tag, DT_DEBUG); \
711 ESET(dyn->d_un.d_ptr, 0); \
712 } else if (fix_elf) { \
713 /* try to clean "bad" paths */ \
714 size_t len, tmpdir_len; \
715 char *start, *end; \
716 const char *tmpdir; \
717 start = *r; \
718 tmpdir = (getenv("TMPDIR") ? : "."); \
719 tmpdir_len = strlen(tmpdir); \
720 while (1) { \
721 end = strchr(start, ':'); \
722 if (start == end) { \
723 eat_this_path##B: \
724 len = strlen(end); \
725 memmove(start, end+1, len); \
726 start[len-1] = '\0'; \
727 end = start - 1; \
728 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
729 if (!end) { \
730 if (start == *r) \
731 goto nuke_it##B; \
732 *--start = '\0'; \
733 } else \
734 goto eat_this_path##B; \
735 } \
736 if (!end) \
737 break; \
738 start = end + 1; \
739 } \
740 if (**r == '\0') \
741 goto nuke_it##B; \
742 } \
743 if (*r) \
461 if (*r) *found_rpath = 1; \ 744 *found_rpath = 1; \
745 } \
462 } \ 746 } \
463 ++dyn; \ 747 ++dyn; \
464 } \ 748 } \
465 } } 749 } }
466 SHOW_RPATH(32) 750 SHOW_RPATH(32)
488 772
489#define LDSO_CACHE_MAGIC "ld.so-" 773#define LDSO_CACHE_MAGIC "ld.so-"
490#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1) 774#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
491#define LDSO_CACHE_VER "1.7.0" 775#define LDSO_CACHE_VER "1.7.0"
492#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1) 776#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
777#define FLAG_ANY -1
778#define FLAG_TYPE_MASK 0x00ff
779#define FLAG_LIBC4 0x0000
780#define FLAG_ELF 0x0001
781#define FLAG_ELF_LIBC5 0x0002
782#define FLAG_ELF_LIBC6 0x0003
783#define FLAG_REQUIRED_MASK 0xff00
784#define FLAG_SPARC_LIB64 0x0100
785#define FLAG_IA64_LIB64 0x0200
786#define FLAG_X8664_LIB64 0x0300
787#define FLAG_S390_LIB64 0x0400
788#define FLAG_POWERPC_LIB64 0x0500
789#define FLAG_MIPS64_LIBN32 0x0600
790#define FLAG_MIPS64_LIBN64 0x0700
493 791
494static char *lookup_cache_lib(char *); 792#if defined(__GLIBC__) || defined(__UCLIBC__)
793
495static char *lookup_cache_lib(char *fname) 794static char *lookup_cache_lib(elfobj *elf, const char *fname)
496{ 795{
497 int fd = 0; 796 int fd;
498 char *strs; 797 char *strs;
499 static char buf[_POSIX_PATH_MAX] = ""; 798 static char buf[__PAX_UTILS_PATH_MAX] = "";
500 const char *cachefile = "/etc/ld.so.cache"; 799 const char *cachefile = root_rel_path("/etc/ld.so.cache");
501 struct stat st; 800 struct stat st;
502 801
503 typedef struct { 802 typedef struct {
504 char magic[LDSO_CACHE_MAGIC_LEN]; 803 char magic[LDSO_CACHE_MAGIC_LEN];
505 char version[LDSO_CACHE_VER_LEN]; 804 char version[LDSO_CACHE_VER_LEN];
506 int nlibs; 805 int nlibs;
507 } header_t; 806 } header_t;
807 header_t *header;
508 808
509 typedef struct { 809 typedef struct {
510 int flags; 810 int flags;
511 int sooffset; 811 int sooffset;
512 int liboffset; 812 int liboffset;
513 } libentry_t; 813 } libentry_t;
514
515 header_t *header;
516 libentry_t *libent; 814 libentry_t *libent;
517 815
518 if (fname == NULL) 816 if (fname == NULL)
519 return NULL; 817 return NULL;
520 818
521 if (ldcache == 0) { 819 if (ldcache == NULL) {
522 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) < 0) 820 if (fstatat(root_fd, cachefile, &st, 0))
523 return NULL; 821 return NULL;
524 /* save the cache size for latter unmapping */ 822
823 fd = openat(root_fd, cachefile, O_RDONLY);
824 if (fd == -1)
825 return NULL;
826
827 /* cache these values so we only map/unmap the cache file once */
525 ldcache_size = st.st_size; 828 ldcache_size = st.st_size;
829 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
830 close(fd);
526 831
527 if ((ldcache = mmap(0, st.st_size, PROT_READ, MAP_SHARED, fd, 0)) == (caddr_t) -1) 832 if (ldcache == MAP_FAILED) {
833 ldcache = NULL;
528 return NULL; 834 return NULL;
835 }
529 836
530 close(fd);
531
532 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN)) 837 if (memcmp(header->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN) ||
838 memcmp(header->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
839 {
840 munmap(ldcache, ldcache_size);
841 ldcache = NULL;
533 return NULL; 842 return NULL;
534
535 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
536 return NULL;
537 } 843 }
844 } else
845 header = ldcache;
538 846
539 header = (header_t *) ldcache;
540 libent = (libentry_t *) (ldcache + sizeof(header_t)); 847 libent = ldcache + sizeof(header_t);
541 strs = (char *) &libent[header->nlibs]; 848 strs = (char *) &libent[header->nlibs];
542 849
543 for (fd = 0; fd < header->nlibs; fd++) { 850 for (fd = 0; fd < header->nlibs; ++fd) {
851 /* This should be more fine grained, but for now we assume that
852 * diff arches will not be cached together, and we ignore the
853 * the different multilib mips cases.
854 */
855 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
856 continue;
857 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
858 continue;
859
544 if (strcmp(fname, strs + libent[fd].sooffset) != 0) 860 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
545 continue; 861 continue;
862
863 /* Return first hit because that is how the ldso rolls */
546 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf)); 864 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
865 break;
547 } 866 }
867
548 return buf; 868 return buf;
549} 869}
550 870
871#elif defined(__NetBSD__)
872static char *lookup_cache_lib(elfobj *elf, const char *fname)
873{
874 static char buf[__PAX_UTILS_PATH_MAX] = "";
875 static struct stat st;
876 size_t n;
877 char *ldpath;
878
879 array_for_each(ldpath, n, ldpath) {
880 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", ldpath, fname) >= sizeof(buf))
881 continue; /* if the pathname is too long, or something went wrong, ignore */
882
883 if (stat(buf, &st) != 0)
884 continue; /* if the lib doesn't exist in *ldpath, look further */
885
886 /* NetBSD doesn't actually do sanity checks, it just loads the file
887 * and if that doesn't work, continues looking in other directories.
888 * This cannot easily be safely emulated, unfortunately. For now,
889 * just assume that if it exists, it's a valid library. */
890
891 return buf;
892 }
893
894 /* not found in any path */
895 return NULL;
896}
897#else
898#ifdef __ELF__
899#warning Cache support not implemented for your target
900#endif
901static char *lookup_cache_lib(elfobj *elf, const char *fname)
902{
903 return NULL;
904}
905#endif
906
907static char *lookup_config_lib(elfobj *elf, char *fname)
908{
909 static char buf[__PAX_UTILS_PATH_MAX] = "";
910 const char *ldpath;
911 size_t n;
912
913 array_for_each(ldpaths, n, ldpath) {
914 snprintf(buf, sizeof(buf), "%s/%s", root_rel_path(ldpath), fname);
915 if (faccessat(root_fd, buf, F_OK, AT_SYMLINK_NOFOLLOW) == 0)
916 return buf;
917 }
918
919 return NULL;
920}
551 921
552static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len) 922static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
553{ 923{
554 unsigned long i; 924 unsigned long i;
555 char *needed; 925 char *needed;
556 void *strtbl_void; 926 void *strtbl_void;
557 char *p; 927 char *p;
558 928
929 /*
930 * -n -> op==0 -> print all
931 * -N -> op==1 -> print requested
932 */
559 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL; 933 if ((op == 0 && !show_needed) || (op == 1 && !find_lib))
934 return NULL;
560 935
561 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 936 strtbl_void = elf_findsecbyname(elf, ".dynstr");
562 937
563 if (elf->phdr && strtbl_void) { 938 if (elf->phdr && strtbl_void) {
564#define SHOW_NEEDED(B) \ 939#define SHOW_NEEDED(B) \
566 Elf ## B ## _Dyn *dyn; \ 941 Elf ## B ## _Dyn *dyn; \
567 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 942 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
568 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 943 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
569 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 944 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
570 Elf ## B ## _Off offset; \ 945 Elf ## B ## _Off offset; \
946 size_t matched = 0; \
947 /* Walk all the program headers to find the PT_DYNAMIC */ \
571 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 948 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
572 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 949 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) \
950 continue; \
573 offset = EGET(phdr[i].p_offset); \ 951 offset = EGET(phdr[i].p_offset); \
574 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 952 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
953 continue; \
954 /* Walk all the dynamic tags to find NEEDED entries */ \
575 dyn = DYN ## B (elf->data + offset); \ 955 dyn = DYN ## B (elf->vdata + offset); \
576 while (EGET(dyn->d_tag) != DT_NULL) { \ 956 while (EGET(dyn->d_tag) != DT_NULL) { \
577 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 957 if (EGET(dyn->d_tag) == DT_NEEDED) { \
578 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 958 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
579 if (offset >= (Elf ## B ## _Off)elf->len) { \ 959 if (offset >= (Elf ## B ## _Off)elf->len) { \
580 ++dyn; \ 960 ++dyn; \
581 continue; \ 961 continue; \
582 } \ 962 } \
583 needed = (char*)(elf->data + offset); \ 963 needed = elf->data + offset; \
584 if (op == 0) { \ 964 if (op == 0) { \
965 /* -n -> print all entries */ \
585 if (!be_wewy_wewy_quiet) { \ 966 if (!be_wewy_wewy_quiet) { \
586 if (*found_needed) xchrcat(ret, ',', ret_len); \ 967 if (*found_needed) xchrcat(ret, ',', ret_len); \
587 if (printcache) \ 968 if (use_ldpath) { \
588 if ((p = lookup_cache_lib(needed)) != NULL) \ 969 if ((p = lookup_config_lib(elf, needed)) != NULL) \
589 needed = p; \ 970 needed = p; \
971 } else if (use_ldcache) { \
972 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
973 needed = p; \
974 } \
590 xstrcat(ret, needed, ret_len); \ 975 xstrcat(ret, needed, ret_len); \
591 } \ 976 } \
592 *found_needed = 1; \ 977 *found_needed = 1; \
593 } else { \ 978 } else { \
594 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \ 979 /* -N -> print matching entries */ \
980 size_t n; \
981 const char *find_lib_name; \
982 \
983 array_for_each(find_lib_arr, n, find_lib_name) { \
984 int invert = 1; \
985 if (find_lib_name[0] == '!') \
986 invert = 0, ++find_lib_name; \
987 if (!strcmp(find_lib_name, needed) == invert) \
988 ++matched; \
989 } \
990 \
991 if (matched == array_cnt(find_lib_arr)) { \
595 *found_lib = 1; \ 992 *found_lib = 1; \
596 return (be_wewy_wewy_quiet ? NULL : needed); \ 993 return (be_wewy_wewy_quiet ? NULL : find_lib); \
597 } \ 994 } \
598 } \ 995 } \
599 } \ 996 } \
600 ++dyn; \ 997 ++dyn; \
601 } \ 998 } \
630} 1027}
631static char *scanelf_file_bind(elfobj *elf, char *found_bind) 1028static char *scanelf_file_bind(elfobj *elf, char *found_bind)
632{ 1029{
633 unsigned long i; 1030 unsigned long i;
634 struct stat s; 1031 struct stat s;
1032 char dynamic = 0;
635 1033
636 if (!show_bind) return NULL; 1034 if (!show_bind) return NULL;
637 if (!elf->phdr) return NULL; 1035 if (!elf->phdr) return NULL;
638 1036
639#define SHOW_BIND(B) \ 1037#define SHOW_BIND(B) \
641 Elf ## B ## _Dyn *dyn; \ 1039 Elf ## B ## _Dyn *dyn; \
642 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 1040 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
643 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 1041 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
644 Elf ## B ## _Off offset; \ 1042 Elf ## B ## _Off offset; \
645 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 1043 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
646 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 1044 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1045 dynamic = 1; \
647 offset = EGET(phdr[i].p_offset); \ 1046 offset = EGET(phdr[i].p_offset); \
648 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 1047 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
649 dyn = DYN ## B (elf->data + offset); \ 1048 dyn = DYN ## B (elf->vdata + offset); \
650 while (EGET(dyn->d_tag) != DT_NULL) { \ 1049 while (EGET(dyn->d_tag) != DT_NULL) { \
651 if (EGET(dyn->d_tag) == DT_BIND_NOW || \ 1050 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
652 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \ 1051 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
653 { \ 1052 { \
654 if (be_quiet) return NULL; \ 1053 if (be_quiet) return NULL; \
662 SHOW_BIND(32) 1061 SHOW_BIND(32)
663 SHOW_BIND(64) 1062 SHOW_BIND(64)
664 1063
665 if (be_wewy_wewy_quiet) return NULL; 1064 if (be_wewy_wewy_quiet) return NULL;
666 1065
1066 /* 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)) { 1067 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
668 return NULL; 1068 return NULL;
669 } else { 1069 } else {
670 *found_bind = 1; 1070 *found_bind = 1;
671 return (char *) "LAZY"; 1071 return (char *)(dynamic ? "LAZY" : "STATIC");
672 } 1072 }
673} 1073}
674static char *scanelf_file_soname(elfobj *elf, char *found_soname) 1074static char *scanelf_file_soname(elfobj *elf, char *found_soname)
675{ 1075{
676 unsigned long i; 1076 unsigned long i;
688 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 1088 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
689 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 1089 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
690 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 1090 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
691 Elf ## B ## _Off offset; \ 1091 Elf ## B ## _Off offset; \
692 /* only look for soname in shared objects */ \ 1092 /* only look for soname in shared objects */ \
693 if (ehdr->e_type != ET_DYN) \ 1093 if (EGET(ehdr->e_type) != ET_DYN) \
694 return NULL; \ 1094 return NULL; \
695 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 1095 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
696 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 1096 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
697 offset = EGET(phdr[i].p_offset); \ 1097 offset = EGET(phdr[i].p_offset); \
698 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 1098 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
699 dyn = DYN ## B (elf->data + offset); \ 1099 dyn = DYN ## B (elf->vdata + offset); \
700 while (EGET(dyn->d_tag) != DT_NULL) { \ 1100 while (EGET(dyn->d_tag) != DT_NULL) { \
701 if (EGET(dyn->d_tag) == DT_SONAME) { \ 1101 if (EGET(dyn->d_tag) == DT_SONAME) { \
702 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 1102 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
703 if (offset >= (Elf ## B ## _Off)elf->len) { \ 1103 if (offset >= (Elf ## B ## _Off)elf->len) { \
704 ++dyn; \ 1104 ++dyn; \
705 continue; \ 1105 continue; \
706 } \ 1106 } \
707 soname = (char*)(elf->data + offset); \ 1107 soname = elf->data + offset; \
708 *found_soname = 1; \ 1108 *found_soname = 1; \
709 return (be_wewy_wewy_quiet ? NULL : soname); \ 1109 return (be_wewy_wewy_quiet ? NULL : soname); \
710 } \ 1110 } \
711 ++dyn; \ 1111 ++dyn; \
712 } \ 1112 } \
715 SHOW_SONAME(64) 1115 SHOW_SONAME(64)
716 } 1116 }
717 1117
718 return NULL; 1118 return NULL;
719} 1119}
1120
1121/*
1122 * We support the symbol form:
1123 * [%[modifiers]%][[+-]<symbol name>][,[.....]]
1124 * If the symbol name is empty, then all symbols are matched.
1125 * If the symbol name is a glob ("*"), then all symbols are dumped (debug).
1126 * Do not rely on this output format at all.
1127 * Otherwise the symbol name is used to search (either regex or string compare).
1128 * If the first char of the symbol name is a plus ("+"), then only match
1129 * defined symbols. If it's a minus ("-"), only match undefined symbols.
1130 * Putting modifiers in between the percent signs allows for more in depth
1131 * filters. There are groups of modifiers. If you don't specify a member
1132 * of a group, then all types in that group are matched. The current
1133 * groups and their types are:
1134 * STT group: STT_NOTYPE:n STT_OBJECT:o STT_FUNC:f STT_FILE:F
1135 * STB group: STB_LOCAL:l STB_GLOBAL:g STB_WEAK:w
1136 * SHN group: SHN_UNDEF:u SHN_ABS:a SHN_COMMON:c {defined}:d
1137 * The "defined" value in the SHN group does not correspond to a SHN_xxx define.
1138 * You can search for multiple symbols at once by seperating with a comma (",").
1139 *
1140 * Some examples:
1141 * ELFs with a weak function "foo":
1142 * scanelf -s %wf%foo <ELFs>
1143 * ELFs that define the symbol "main":
1144 * scanelf -s +main <ELFs>
1145 * scanelf -s %d%main <ELFs>
1146 * ELFs that refer to the undefined symbol "brk":
1147 * scanelf -s -brk <ELFs>
1148 * scanelf -s %u%brk <ELFs>
1149 * All global defined objects in an ELF:
1150 * scanelf -s %ogd% <ELF>
1151 */
1152static void
1153scanelf_match_symname(elfobj *elf, char *found_sym, char **ret, size_t *ret_len, const char *symname,
1154 unsigned int stt, unsigned int stb, unsigned int shn, unsigned long size)
1155{
1156 const char *this_sym;
1157 size_t n;
1158
1159 array_for_each(find_sym_arr, n, this_sym) {
1160 bool inc_notype, inc_object, inc_func, inc_file,
1161 inc_local, inc_global, inc_weak,
1162 inc_def, inc_undef, inc_abs, inc_common;
1163
1164 /* symbol selection! */
1165 inc_notype = inc_object = inc_func = inc_file = \
1166 inc_local = inc_global = inc_weak = \
1167 inc_def = inc_undef = inc_abs = inc_common = \
1168 (*this_sym != '%');
1169
1170 /* parse the contents of %...% */
1171 if (!inc_notype) {
1172 while (*(this_sym++)) {
1173 if (*this_sym == '%') {
1174 ++this_sym;
1175 break;
1176 }
1177 switch (*this_sym) {
1178 case 'n': inc_notype = true; break;
1179 case 'o': inc_object = true; break;
1180 case 'f': inc_func = true; break;
1181 case 'F': inc_file = true; break;
1182 case 'l': inc_local = true; break;
1183 case 'g': inc_global = true; break;
1184 case 'w': inc_weak = true; break;
1185 case 'd': inc_def = true; break;
1186 case 'u': inc_undef = true; break;
1187 case 'a': inc_abs = true; break;
1188 case 'c': inc_common = true; break;
1189 default: err("invalid symbol selector '%c'", *this_sym);
1190 }
1191 }
1192
1193 /* If no types are matched, not match all */
1194 if (!inc_notype && !inc_object && !inc_func && !inc_file)
1195 inc_notype = inc_object = inc_func = inc_file = true;
1196 if (!inc_local && !inc_global && !inc_weak)
1197 inc_local = inc_global = inc_weak = true;
1198 if (!inc_def && !inc_undef && !inc_abs && !inc_common)
1199 inc_def = inc_undef = inc_abs = inc_common = true;
1200
1201 /* backwards compat for defined/undefined short hand */
1202 } else if (*this_sym == '+') {
1203 inc_undef = false;
1204 ++this_sym;
1205 } else if (*this_sym == '-') {
1206 inc_def = inc_abs = inc_common = false;
1207 ++this_sym;
1208 }
1209
1210 /* filter symbols */
1211 if ((!inc_notype && stt == STT_NOTYPE) || \
1212 (!inc_object && stt == STT_OBJECT) || \
1213 (!inc_func && stt == STT_FUNC ) || \
1214 (!inc_file && stt == STT_FILE ) || \
1215 (!inc_local && stb == STB_LOCAL ) || \
1216 (!inc_global && stb == STB_GLOBAL) || \
1217 (!inc_weak && stb == STB_WEAK ) || \
1218 (!inc_def && shn && shn < SHN_LORESERVE) || \
1219 (!inc_undef && shn == SHN_UNDEF ) || \
1220 (!inc_abs && shn == SHN_ABS ) || \
1221 (!inc_common && shn == SHN_COMMON))
1222 continue;
1223
1224 if (*this_sym == '*') {
1225 /* a "*" symbol gets you debug output */
1226 printf("%s(%s) %5lX %15s %15s %15s %s\n",
1227 ((*found_sym == 0) ? "\n\t" : "\t"),
1228 elf->base_filename,
1229 size,
1230 get_elfstttype(stt),
1231 get_elfstbtype(stb),
1232 get_elfshntype(shn),
1233 symname);
1234 goto matched;
1235
1236 } else {
1237 if (g_match) {
1238 /* regex match the symbol */
1239 if (regexec(find_sym_regex_arr->eles[n], symname, 0, NULL, 0) == REG_NOMATCH)
1240 continue;
1241
1242 } else if (*this_sym) {
1243 /* give empty symbols a "pass", else do a normal compare */
1244 const size_t len = strlen(this_sym);
1245 if (!(strncmp(this_sym, symname, len) == 0 &&
1246 /* Accept unversioned symbol names */
1247 (symname[len] == '\0' || symname[len] == '@')))
1248 continue;
1249 }
1250
1251 if (be_semi_verbose) {
1252 char buf[1024];
1253 snprintf(buf, sizeof(buf), "%lX %s %s",
1254 size,
1255 get_elfstttype(stt),
1256 this_sym);
1257 *ret = xstrdup(buf);
1258 } else {
1259 if (*ret) xchrcat(ret, ',', ret_len);
1260 xstrcat(ret, symname, ret_len);
1261 }
1262
1263 goto matched;
1264 }
1265 }
1266
1267 return;
1268
1269 matched:
1270 *found_sym = 1;
1271}
1272
720static char *scanelf_file_sym(elfobj *elf, char *found_sym) 1273static const char *scanelf_file_sym(elfobj *elf, char *found_sym)
721{ 1274{
722 unsigned long i;
723 char *ret; 1275 char *ret;
724 void *symtab_void, *strtab_void; 1276 void *symtab_void, *strtab_void;
725 1277
726 if (!find_sym) return NULL; 1278 if (!find_sym) return NULL;
727 ret = find_sym; 1279 ret = NULL;
728 1280
729 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void); 1281 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
730 1282
731 if (symtab_void && strtab_void) { 1283 if (symtab_void && strtab_void) {
732#define FIND_SYM(B) \ 1284#define FIND_SYM(B) \
733 if (elf->elf_class == ELFCLASS ## B) { \ 1285 if (elf->elf_class == ELFCLASS ## B) { \
734 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 1286 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
735 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 1287 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
736 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 1288 Elf ## B ## _Sym *sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
737 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 1289 Elf ## B ## _Word i, cnt = EGET(symtab->sh_entsize); \
738 char *symname; \ 1290 char *symname; \
1291 size_t ret_len = 0; \
1292 if (cnt) \
1293 cnt = EGET(symtab->sh_size) / cnt; \
739 for (i = 0; i < cnt; ++i) { \ 1294 for (i = 0; i < cnt; ++i) { \
1295 if ((void*)sym > elf->data_end) { \
1296 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1297 goto break_out; \
1298 } \
740 if (sym->st_name) { \ 1299 if (sym->st_name) { \
1300 /* make sure the symbol name is in acceptable memory range */ \
741 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 1301 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
742 if (*find_sym == '*') { \ 1302 if ((void*)symname > elf->data_end) { \
743 printf("%s(%s) %5lX %15s %s\n", \ 1303 warnf("%s: corrupt ELF symbols", elf->filename); \
744 ((*found_sym == 0) ? "\n\t" : "\t"), \ 1304 ++sym; \
745 elf->base_filename, \ 1305 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 } \ 1306 } \
1307 scanelf_match_symname(elf, found_sym, \
1308 &ret, &ret_len, symname, \
1309 ELF##B##_ST_TYPE(EGET(sym->st_info)), \
1310 ELF##B##_ST_BIND(EGET(sym->st_info)), \
1311 EGET(sym->st_shndx), \
1312 /* st_size can be 64bit, but no one is really that big, so screw em */ \
1313 EGET(sym->st_size)); \
766 } \ 1314 } \
767 ++sym; \ 1315 ++sym; \
768 } } 1316 } \
1317 }
769 FIND_SYM(32) 1318 FIND_SYM(32)
770 FIND_SYM(64) 1319 FIND_SYM(64)
771 } 1320 }
772 1321
773break_out: 1322break_out:
776 if (*find_sym != '*' && *found_sym) 1325 if (*find_sym != '*' && *found_sym)
777 return ret; 1326 return ret;
778 if (be_quiet) 1327 if (be_quiet)
779 return NULL; 1328 return NULL;
780 else 1329 else
781 return (char *)" - "; 1330 return " - ";
782} 1331}
1332
1333static const char *scanelf_file_sections(elfobj *elf, char *found_section)
1334{
1335 if (!find_section)
1336 return NULL;
1337
1338#define FIND_SECTION(B) \
1339 if (elf->elf_class == ELFCLASS ## B) { \
1340 size_t matched, n; \
1341 int invert; \
1342 const char *section_name; \
1343 Elf ## B ## _Shdr *section; \
1344 \
1345 matched = 0; \
1346 array_for_each(find_section_arr, n, section_name) { \
1347 invert = (*section_name == '!' ? 1 : 0); \
1348 section = SHDR ## B (elf_findsecbyname(elf, section_name + invert)); \
1349 if ((section == NULL && invert) || (section != NULL && !invert)) \
1350 ++matched; \
1351 } \
1352 \
1353 if (matched == array_cnt(find_section_arr)) \
1354 *found_section = 1; \
1355 }
1356 FIND_SECTION(32)
1357 FIND_SECTION(64)
1358
1359 if (be_wewy_wewy_quiet)
1360 return NULL;
1361
1362 if (*found_section)
1363 return find_section;
1364
1365 if (be_quiet)
1366 return NULL;
1367 else
1368 return " - ";
1369}
1370
783/* scan an elf file and show all the fun stuff */ 1371/* scan an elf file and show all the fun stuff */
784#define prints(str) write(fileno(stdout), str, strlen(str)) 1372#define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
785static void scanelf_file(const char *filename) 1373static int scanelf_elfobj(elfobj *elf)
786{ 1374{
787 unsigned long i; 1375 unsigned long i;
788 char found_pax, found_phdr, found_relro, found_load, found_textrel, 1376 char found_pax, found_phdr, found_relro, found_load, found_textrel,
789 found_rpath, found_needed, found_interp, found_bind, found_soname, 1377 found_rpath, found_needed, found_interp, found_bind, found_soname,
790 found_sym, found_lib, found_file, found_textrels; 1378 found_sym, found_lib, found_file, found_textrels, found_section;
791 elfobj *elf;
792 struct stat st;
793 static char *out_buffer = NULL; 1379 static char *out_buffer = NULL;
794 static size_t out_len; 1380 static size_t out_len;
795 1381
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 = \ 1382 found_pax = found_phdr = found_relro = found_load = found_textrel = \
812 found_rpath = found_needed = found_interp = found_bind = found_soname = \ 1383 found_rpath = found_needed = found_interp = found_bind = found_soname = \
813 found_sym = found_lib = found_file = found_textrels = 0; 1384 found_sym = found_lib = found_file = found_textrels = found_section = 0;
814 1385
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) 1386 if (be_verbose > 2)
822 printf("%s: scanning file {%s,%s}\n", filename, 1387 printf("%s: scanning file {%s,%s}\n", elf->filename,
823 get_elfeitype(EI_CLASS, elf->elf_class), 1388 get_elfeitype(EI_CLASS, elf->elf_class),
824 get_elfeitype(EI_DATA, elf->data[EI_DATA])); 1389 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
825 else if (be_verbose) 1390 else if (be_verbose > 1)
826 printf("%s: scanning file\n", filename); 1391 printf("%s: scanning file\n", elf->filename);
827 1392
828 /* init output buffer */ 1393 /* init output buffer */
829 if (!out_buffer) { 1394 if (!out_buffer) {
830 out_len = sizeof(char) * 80; 1395 out_len = sizeof(char) * 80;
831 out_buffer = (char*)xmalloc(out_len); 1396 out_buffer = xmalloc(out_len);
832 } 1397 }
833 *out_buffer = '\0'; 1398 *out_buffer = '\0';
834 1399
835 /* show the header */ 1400 /* show the header */
836 if (!be_quiet && show_banner) { 1401 if (!be_quiet && show_banner) {
837 for (i = 0; out_format[i]; ++i) { 1402 for (i = 0; out_format[i]; ++i) {
838 if (!IS_MODIFIER(out_format[i])) continue; 1403 if (!IS_MODIFIER(out_format[i])) continue;
839 1404
840 switch (out_format[++i]) { 1405 switch (out_format[++i]) {
1406 case '+': break;
841 case '%': break; 1407 case '%': break;
842 case '#': break; 1408 case '#': break;
843 case 'F': 1409 case 'F':
844 case 'p': 1410 case 'p':
845 case 'f': prints("FILE "); found_file = 1; break; 1411 case 'f': prints("FILE "); found_file = 1; break;
846 case 'o': prints(" TYPE "); break; 1412 case 'o': prints(" TYPE "); break;
847 case 'x': prints(" PAX "); break; 1413 case 'x': prints(" PAX "); break;
848 case 'e': prints("STK/REL/PTL "); break; 1414 case 'e': prints("STK/REL/PTL "); break;
849 case 't': prints("TEXTREL "); break; 1415 case 't': prints("TEXTREL "); break;
850 case 'r': prints("RPATH "); break; 1416 case 'r': prints("RPATH "); break;
1417 case 'M': prints("CLASS "); break;
1418 case 'l':
851 case 'n': prints("NEEDED "); break; 1419 case 'n': prints("NEEDED "); break;
852 case 'i': prints("INTERP "); break; 1420 case 'i': prints("INTERP "); break;
853 case 'b': prints("BIND "); break; 1421 case 'b': prints("BIND "); break;
1422 case 'Z': prints("SIZE "); break;
854 case 'S': prints("SONAME "); break; 1423 case 'S': prints("SONAME "); break;
855 case 's': prints("SYM "); break; 1424 case 's': prints("SYM "); break;
856 case 'N': prints("LIB "); break; 1425 case 'N': prints("LIB "); break;
857 case 'T': prints("TEXTRELS "); break; 1426 case 'T': prints("TEXTRELS "); break;
1427 case 'k': prints("SECTION "); break;
1428 case 'a': prints("ARCH "); break;
1429 case 'I': prints("OSABI "); break;
1430 case 'Y': prints("EABI "); break;
1431 case 'O': prints("PERM "); break;
1432 case 'D': prints("ENDIAN "); break;
858 default: warnf("'%c' has no title ?", out_format[i]); 1433 default: warnf("'%c' has no title ?", out_format[i]);
859 } 1434 }
860 } 1435 }
861 if (!found_file) prints("FILE "); 1436 if (!found_file) prints("FILE ");
862 prints("\n"); 1437 prints("\n");
866 1441
867 /* dump all the good stuff */ 1442 /* dump all the good stuff */
868 for (i = 0; out_format[i]; ++i) { 1443 for (i = 0; out_format[i]; ++i) {
869 const char *out; 1444 const char *out;
870 const char *tmp; 1445 const char *tmp;
871 1446 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])) { 1447 if (!IS_MODIFIER(out_format[i])) {
877 xchrcat(&out_buffer, out_format[i], &out_len); 1448 xchrcat(&out_buffer, out_format[i], &out_len);
878 continue; 1449 continue;
879 } 1450 }
880 1451
881 out = NULL; 1452 out = NULL;
882 be_wewy_wewy_quiet = (out_format[i] == '#'); 1453 be_wewy_wewy_quiet = (out_format[i] == '#');
1454 be_semi_verbose = (out_format[i] == '+');
883 switch (out_format[++i]) { 1455 switch (out_format[++i]) {
1456 case '+':
884 case '%': 1457 case '%':
885 case '#': 1458 case '#':
886 xchrcat(&out_buffer, out_format[i], &out_len); break; 1459 xchrcat(&out_buffer, out_format[i], &out_len); break;
887 case 'F': 1460 case 'F':
888 found_file = 1; 1461 found_file = 1;
889 if (be_wewy_wewy_quiet) break; 1462 if (be_wewy_wewy_quiet) break;
890 xstrcat(&out_buffer, filename, &out_len); 1463 xstrcat(&out_buffer, elf->filename, &out_len);
891 break; 1464 break;
892 case 'p': 1465 case 'p':
893 found_file = 1; 1466 found_file = 1;
894 if (be_wewy_wewy_quiet) break; 1467 if (be_wewy_wewy_quiet) break;
895 tmp = filename; 1468 tmp = elf->filename;
896 if (search_path) { 1469 if (search_path) {
897 ssize_t len_search = strlen(search_path); 1470 ssize_t len_search = strlen(search_path);
898 ssize_t len_file = strlen(filename); 1471 ssize_t len_file = strlen(elf->filename);
899 if (!strncmp(filename, search_path, len_search) && \ 1472 if (!strncmp(elf->filename, search_path, len_search) && \
900 len_file > len_search) 1473 len_file > len_search)
901 tmp += len_search; 1474 tmp += len_search;
902 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++; 1475 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
903 } 1476 }
904 xstrcat(&out_buffer, tmp, &out_len); 1477 xstrcat(&out_buffer, tmp, &out_len);
905 break; 1478 break;
906 case 'f': 1479 case 'f':
907 found_file = 1; 1480 found_file = 1;
908 if (be_wewy_wewy_quiet) break; 1481 if (be_wewy_wewy_quiet) break;
909 tmp = strrchr(filename, '/'); 1482 tmp = strrchr(elf->filename, '/');
910 tmp = (tmp == NULL ? filename : tmp+1); 1483 tmp = (tmp == NULL ? elf->filename : tmp+1);
911 xstrcat(&out_buffer, tmp, &out_len); 1484 xstrcat(&out_buffer, tmp, &out_len);
912 break; 1485 break;
913 case 'o': out = get_elfetype(elf); break; 1486 case 'o': out = get_elfetype(elf); break;
914 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1487 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; 1488 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; 1489 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
917 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break; 1490 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; 1491 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1492 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1493 case 'D': out = get_endian(elf); break;
1494 case 'O': out = strfileperms(elf->filename); break;
919 case 'n': 1495 case 'n':
920 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break; 1496 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; 1497 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
922 case 'b': out = scanelf_file_bind(elf, &found_bind); break; 1498 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
923 case 'S': out = scanelf_file_soname(elf, &found_soname); break; 1499 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
924 case 's': out = scanelf_file_sym(elf, &found_sym); break; 1500 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1501 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1502 case 'a': out = get_elfemtype(elf); break;
1503 case 'I': out = get_elfosabi(elf); break;
1504 case 'Y': out = get_elf_eabi(elf); break;
1505 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]); 1506 default: warnf("'%c' has no scan code?", out_format[i]);
926 } 1507 }
927 if (out) { 1508 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); 1509 xstrcat(&out_buffer, out, &out_len);
933 }
934 } 1510 }
935 1511
936#define FOUND_SOMETHING() \ 1512#define FOUND_SOMETHING() \
937 (found_pax || found_phdr || found_relro || found_load || found_textrel || \ 1513 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
938 found_rpath || found_needed || found_interp || found_bind || \ 1514 found_rpath || found_needed || found_interp || found_bind || \
939 found_soname || found_sym || found_lib || found_textrels) 1515 found_soname || found_sym || found_lib || found_textrels || found_section )
940 1516
941 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) { 1517 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
942 xchrcat(&out_buffer, ' ', &out_len); 1518 xchrcat(&out_buffer, ' ', &out_len);
943 xstrcat(&out_buffer, filename, &out_len); 1519 xstrcat(&out_buffer, elf->filename, &out_len);
944 } 1520 }
945 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) { 1521 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
946 puts(out_buffer); 1522 puts(out_buffer);
947 fflush(stdout); 1523 fflush(stdout);
948 } 1524 }
949 1525
1526 return 0;
1527}
1528
1529/* scan a single elf */
1530static int scanelf_elf(const char *filename, int fd, size_t len)
1531{
1532 int ret = 1;
1533 elfobj *elf;
1534
1535 /* verify this is real ELF */
1536 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1537 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1538 return 2;
1539 }
1540 switch (match_bits) {
1541 case 32:
1542 if (elf->elf_class != ELFCLASS32)
1543 goto label_done;
1544 break;
1545 case 64:
1546 if (elf->elf_class != ELFCLASS64)
1547 goto label_done;
1548 break;
1549 default: break;
1550 }
1551 if (match_etypes) {
1552 char sbuf[126];
1553 strncpy(sbuf, match_etypes, sizeof(sbuf));
1554 if (strchr(match_etypes, ',') != NULL) {
1555 char *p;
1556 while ((p = strrchr(sbuf, ',')) != NULL) {
1557 *p = 0;
1558 if (etype_lookup(p+1) == get_etype(elf))
1559 goto label_ret;
1560 }
1561 }
1562 if (etype_lookup(sbuf) != get_etype(elf))
1563 goto label_done;
1564 }
1565
1566label_ret:
1567 ret = scanelf_elfobj(elf);
1568
1569label_done:
950 unreadelf(elf); 1570 unreadelf(elf);
1571 return ret;
1572}
1573
1574/* scan an archive of elfs */
1575static int scanelf_archive(const char *filename, int fd, size_t len)
1576{
1577 archive_handle *ar;
1578 archive_member *m;
1579 char *ar_buffer;
1580 elfobj *elf;
1581
1582 ar = ar_open_fd(filename, fd);
1583 if (ar == NULL)
1584 return 1;
1585
1586 ar_buffer = mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1587 while ((m = ar_next(ar)) != NULL) {
1588 off_t cur_pos = lseek(fd, 0, SEEK_CUR);
1589 if (cur_pos == -1)
1590 errp("lseek() failed");
1591 elf = readelf_buffer(m->name, ar_buffer + cur_pos, m->size);
1592 if (elf) {
1593 scanelf_elfobj(elf);
1594 unreadelf(elf);
1595 }
1596 }
1597 munmap(ar_buffer, len);
1598
1599 return 0;
1600}
1601/* scan a file which may be an elf or an archive or some other magical beast */
1602static int scanelf_fileat(int dir_fd, const char *filename, const struct stat *st_cache)
1603{
1604 const struct stat *st = st_cache;
1605 struct stat symlink_st;
1606 int fd;
1607
1608 /* always handle regular files and handle symlinked files if no -y */
1609 if (S_ISLNK(st->st_mode)) {
1610 if (!scan_symlink)
1611 return 1;
1612 fstatat(dir_fd, filename, &symlink_st, 0);
1613 st = &symlink_st;
1614 }
1615
1616 if (!S_ISREG(st->st_mode)) {
1617 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1618 return 1;
1619 }
1620
1621 if (match_perms) {
1622 if ((st->st_mode | match_perms) != st->st_mode)
1623 return 1;
1624 }
1625 fd = openat(dir_fd, filename, (fix_elf ? O_RDWR : O_RDONLY) | O_CLOEXEC);
1626 if (fd == -1) {
1627 if (fix_elf && errno == ETXTBSY)
1628 warnp("%s: could not fix", filename);
1629 else if (be_verbose > 2)
1630 printf("%s: skipping file: %s\n", filename, strerror(errno));
1631 return 1;
1632 }
1633
1634 if (scanelf_elf(filename, fd, st->st_size) == 2) {
1635 /* if it isn't an ELF, maybe it's an .a archive */
1636 if (scan_archives)
1637 scanelf_archive(filename, fd, st->st_size);
1638
1639 /*
1640 * unreadelf() implicitly closes its fd, so only close it
1641 * when we are returning it in the non-ELF case
1642 */
1643 close(fd);
1644 }
1645
1646 return 0;
951} 1647}
952 1648
953/* scan a directory for ET_EXEC files and print when we find one */ 1649/* scan a directory for ET_EXEC files and print when we find one */
954static void scanelf_dir(const char *path) 1650static int scanelf_dirat(int dir_fd, const char *path)
955{ 1651{
956 register DIR *dir; 1652 register DIR *dir;
957 register struct dirent *dentry; 1653 register struct dirent *dentry;
958 struct stat st_top, st; 1654 struct stat st_top, st;
959 char buf[_POSIX_PATH_MAX]; 1655 char buf[__PAX_UTILS_PATH_MAX], *subpath;
960 size_t pathlen = 0, len = 0; 1656 size_t pathlen = 0, len = 0;
1657 int ret = 0;
1658 int subdir_fd;
961 1659
962 /* make sure path exists */ 1660 /* make sure path exists */
963 if (lstat(path, &st_top) == -1) { 1661 if (fstatat(dir_fd, path, &st_top, AT_SYMLINK_NOFOLLOW) == -1) {
964 if (be_verbose > 2) printf("%s: does not exist\n", path); 1662 if (be_verbose > 2) printf("%s: does not exist\n", path);
965 return; 1663 return 1;
966 } 1664 }
967 1665
968 /* ok, if it isn't a directory, assume we can open it */ 1666 /* ok, if it isn't a directory, assume we can open it */
969 if (!S_ISDIR(st_top.st_mode)) { 1667 if (!S_ISDIR(st_top.st_mode))
970 scanelf_file(path); 1668 return scanelf_fileat(dir_fd, path, &st_top);
971 return;
972 }
973 1669
974 /* now scan the dir looking for fun stuff */ 1670 /* now scan the dir looking for fun stuff */
975 if ((dir = opendir(path)) == NULL) { 1671 subdir_fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
976 warnf("could not opendir %s: %s", path, strerror(errno)); 1672 if (subdir_fd == -1)
1673 dir = NULL;
1674 else
1675 dir = fdopendir(subdir_fd);
1676 if (dir == NULL) {
1677 if (subdir_fd != -1)
1678 close(subdir_fd);
1679 warnfp("could not opendir(%s)", path);
977 return; 1680 return 1;
978 } 1681 }
979 if (be_verbose) printf("%s: scanning dir\n", path); 1682 if (be_verbose > 1) printf("%s: scanning dir\n", path);
980 1683
981 pathlen = strlen(path); 1684 subpath = stpcpy(buf, path);
1685 if (subpath[-1] != '/')
1686 *subpath++ = '/';
1687 pathlen = subpath - buf;
982 while ((dentry = readdir(dir))) { 1688 while ((dentry = readdir(dir))) {
983 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1689 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
984 continue; 1690 continue;
1691
1692 if (fstatat(subdir_fd, dentry->d_name, &st, AT_SYMLINK_NOFOLLOW) == -1)
1693 continue;
1694
985 len = (pathlen + 1 + strlen(dentry->d_name) + 1); 1695 len = strlen(dentry->d_name);
986 if (len >= sizeof(buf)) { 1696 if (len + pathlen + 1 >= sizeof(buf)) {
987 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path, 1697 warnf("Skipping '%s%s': len > sizeof(buf); %zu > %zu\n",
988 (unsigned long)len, (unsigned long)sizeof(buf)); 1698 path, dentry->d_name, len + pathlen + 1, sizeof(buf));
989 continue; 1699 continue;
990 } 1700 }
991 sprintf(buf, "%s/%s", path, dentry->d_name); 1701 memcpy(subpath, dentry->d_name, len);
992 if (lstat(buf, &st) != -1) { 1702 subpath[len] = '\0';
1703
993 if (S_ISREG(st.st_mode)) 1704 if (S_ISREG(st.st_mode))
994 scanelf_file(buf); 1705 ret = scanelf_fileat(dir_fd, buf, &st);
995 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1706 else if (dir_recurse && S_ISDIR(st.st_mode)) {
996 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1707 if (dir_crossmount || (st_top.st_dev == st.st_dev))
997 scanelf_dir(buf); 1708 ret = scanelf_dirat(dir_fd, buf);
998 }
999 } 1709 }
1000 } 1710 }
1001 closedir(dir); 1711 closedir(dir);
1002}
1003 1712
1713 return ret;
1714}
1715static int scanelf_dir(const char *path)
1716{
1717 return scanelf_dirat(root_fd, root_rel_path(path));
1718}
1719
1004static int scanelf_from_file(char *filename) 1720static int scanelf_from_file(const char *filename)
1005{ 1721{
1006 FILE *fp = NULL; 1722 FILE *fp;
1007 char *p; 1723 char *p, *path;
1008 char path[_POSIX_PATH_MAX]; 1724 size_t len;
1725 int ret;
1009 1726
1010 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL)) 1727 if (strcmp(filename, "-") == 0)
1011 fp = stdin; 1728 fp = stdin;
1012 else if ((fp = fopen(filename, "r")) == NULL) 1729 else if ((fp = fopen(filename, "r")) == NULL)
1013 return 1; 1730 return 1;
1014 1731
1015 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1732 path = NULL;
1733 len = 0;
1734 ret = 0;
1735 while (getline(&path, &len, fp) != -1) {
1016 if ((p = strchr(path, '\n')) != NULL) 1736 if ((p = strchr(path, '\n')) != NULL)
1017 *p = 0; 1737 *p = 0;
1018 search_path = path; 1738 search_path = path;
1019 scanelf_dir(path); 1739 ret = scanelf_dir(path);
1020 } 1740 }
1741 free(path);
1742
1021 if (fp != stdin) 1743 if (fp != stdin)
1022 fclose(fp); 1744 fclose(fp);
1745
1023 return 0; 1746 return ret;
1024} 1747}
1025 1748
1026static void load_ld_so_conf() 1749#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1750
1751static int _load_ld_cache_config(const char *fname)
1027{ 1752{
1028 FILE *fp = NULL; 1753 FILE *fp = NULL;
1029 char *p; 1754 char *p, *path;
1030 char path[_POSIX_PATH_MAX]; 1755 size_t len;
1031 int i = 0; 1756 int curr_fd = -1;
1032 1757
1033 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1758 fp = fopenat_r(root_fd, root_rel_path(fname));
1759 if (fp == NULL)
1034 return; 1760 return -1;
1035 1761
1036 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1762 path = NULL;
1037 if (*path != '/') 1763 len = 0;
1038 continue; 1764 while (getline(&path, &len, fp) != -1) {
1039
1040 if ((p = strrchr(path, '\r')) != NULL) 1765 if ((p = strrchr(path, '\r')) != NULL)
1041 *p = 0; 1766 *p = 0;
1042 if ((p = strchr(path, '\n')) != NULL) 1767 if ((p = strchr(path, '\n')) != NULL)
1043 *p = 0; 1768 *p = 0;
1044 1769
1045 ldpaths[i++] = xstrdup(path); 1770 /* recursive includes of the same file will make this segfault. */
1771 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1772 glob_t gl;
1773 size_t x;
1774 const char *gpath;
1046 1775
1047 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths)) 1776 /* re-use existing path buffer ... need to be creative */
1048 break; 1777 if (path[8] != '/')
1778 gpath = memcpy(path + 3, "/etc/", 5);
1779 else
1780 gpath = path + 8;
1781 if (root_fd != AT_FDCWD) {
1782 if (curr_fd == -1) {
1783 curr_fd = open(".", O_RDONLY|O_CLOEXEC);
1784 if (fchdir(root_fd))
1785 errp("unable to change to root dir");
1786 }
1787 gpath = root_rel_path(gpath);
1788 }
1789
1790 if (glob(gpath, 0, NULL, &gl) == 0) {
1791 for (x = 0; x < gl.gl_pathc; ++x) {
1792 /* try to avoid direct loops */
1793 if (strcmp(gl.gl_pathv[x], fname) == 0)
1794 continue;
1795 _load_ld_cache_config(gl.gl_pathv[x]);
1796 }
1797 globfree(&gl);
1798 }
1799
1800 /* failed globs are ignored by glibc */
1801 continue;
1049 } 1802 }
1050 ldpaths[i] = NULL; 1803
1804 if (*path != '/')
1805 continue;
1806
1807 xarraypush_str(ldpaths, path);
1808 }
1809 free(path);
1051 1810
1052 fclose(fp); 1811 fclose(fp);
1812
1813 if (curr_fd != -1) {
1814 if (fchdir(curr_fd))
1815 /* don't care */;
1816 close(curr_fd);
1817 }
1818
1819 return 0;
1820}
1821
1822#elif defined(__FreeBSD__) || defined(__DragonFly__)
1823
1824static int _load_ld_cache_config(const char *fname)
1825{
1826 FILE *fp = NULL;
1827 char *b = NULL, *p;
1828 struct elfhints_hdr hdr;
1829
1830 fp = fopenat_r(root_fd, root_rel_path(fname));
1831 if (fp == NULL)
1832 return -1;
1833
1834 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1835 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1836 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1837 {
1838 fclose(fp);
1839 return -1;
1840 }
1841
1842 b = xmalloc(hdr.dirlistlen + 1);
1843 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1844 fclose(fp);
1845 free(b);
1846 return -1;
1847 }
1848
1849 while ((p = strsep(&b, ":"))) {
1850 if (*p == '\0')
1851 continue;
1852 xarraypush_str(ldpaths, p);
1853 }
1854
1855 free(b);
1856 fclose(fp);
1857 return 0;
1858}
1859
1860#else
1861#ifdef __ELF__
1862#warning Cache config support not implemented for your target
1863#endif
1864static int _load_ld_cache_config(const char *fname)
1865{
1866 return 0;
1867}
1868#endif
1869
1870static void load_ld_cache_config(const char *fname)
1871{
1872 bool scan_l, scan_ul, scan_ull;
1873 size_t n;
1874 const char *ldpath;
1875
1876 _load_ld_cache_config(fname);
1877
1878 scan_l = scan_ul = scan_ull = false;
1879 if (array_cnt(ldpaths)) {
1880 array_for_each(ldpaths, n, ldpath) {
1881 if (!scan_l && !strcmp(ldpath, "/lib")) scan_l = true;
1882 if (!scan_ul && !strcmp(ldpath, "/usr/lib")) scan_ul = true;
1883 if (!scan_ull && !strcmp(ldpath, "/usr/local/lib")) scan_ull = true;
1884 }
1885 }
1886
1887 if (!scan_l) xarraypush_str(ldpaths, "/lib");
1888 if (!scan_ul) xarraypush_str(ldpaths, "/usr/lib");
1889 if (!scan_ull) xarraypush_str(ldpaths, "/usr/local/lib");
1053} 1890}
1054 1891
1055/* scan /etc/ld.so.conf for paths */ 1892/* scan /etc/ld.so.conf for paths */
1056static void scanelf_ldpath() 1893static void scanelf_ldpath(void)
1057{ 1894{
1058 char scan_l, scan_ul, scan_ull; 1895 size_t n;
1059 int i = 0; 1896 const char *ldpath;
1060 1897
1061 if (!ldpaths[0]) 1898 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]); 1899 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} 1900}
1078 1901
1079/* scan env PATH for paths */ 1902/* scan env PATH for paths */
1080static void scanelf_envpath() 1903static void scanelf_envpath(void)
1081{ 1904{
1082 char *path, *p; 1905 char *path, *p;
1083 1906
1084 path = getenv("PATH"); 1907 path = getenv("PATH");
1085 if (!path) 1908 if (!path)
1092 } 1915 }
1093 1916
1094 free(path); 1917 free(path);
1095} 1918}
1096 1919
1097 1920/* 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" 1921#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZCBhV"
1100#define a_argument required_argument 1922#define a_argument required_argument
1101static struct option const long_opts[] = { 1923static struct option const long_opts[] = {
1102 {"path", no_argument, NULL, 'p'}, 1924 {"path", no_argument, NULL, 'p'},
1103 {"ldpath", no_argument, NULL, 'l'}, 1925 {"ldpath", no_argument, NULL, 'l'},
1926 {"use-ldpath",no_argument, NULL, 129},
1927 {"root", a_argument, NULL, 128},
1104 {"recursive", no_argument, NULL, 'R'}, 1928 {"recursive", no_argument, NULL, 'R'},
1105 {"mount", no_argument, NULL, 'm'}, 1929 {"mount", no_argument, NULL, 'm'},
1106 {"symlink", no_argument, NULL, 'y'}, 1930 {"symlink", no_argument, NULL, 'y'},
1931 {"archives", no_argument, NULL, 'A'},
1932 {"ldcache", no_argument, NULL, 'L'},
1933 {"fix", no_argument, NULL, 'X'},
1934 {"setpax", a_argument, NULL, 'z'},
1107 {"pax", no_argument, NULL, 'x'}, 1935 {"pax", no_argument, NULL, 'x'},
1108 {"header", no_argument, NULL, 'e'}, 1936 {"header", no_argument, NULL, 'e'},
1109 {"textrel", no_argument, NULL, 't'}, 1937 {"textrel", no_argument, NULL, 't'},
1110 {"rpath", no_argument, NULL, 'r'}, 1938 {"rpath", no_argument, NULL, 'r'},
1111 {"needed", no_argument, NULL, 'n'}, 1939 {"needed", no_argument, NULL, 'n'},
1112 {"ldcache", no_argument, NULL, 'L'},
1113 {"interp", no_argument, NULL, 'i'}, 1940 {"interp", no_argument, NULL, 'i'},
1114 {"bind", no_argument, NULL, 'b'}, 1941 {"bind", no_argument, NULL, 'b'},
1115 {"soname", no_argument, NULL, 'S'}, 1942 {"soname", no_argument, NULL, 'S'},
1116 {"symbol", a_argument, NULL, 's'}, 1943 {"symbol", a_argument, NULL, 's'},
1944 {"section", a_argument, NULL, 'k'},
1117 {"lib", a_argument, NULL, 'N'}, 1945 {"lib", a_argument, NULL, 'N'},
1118 {"gmatch", no_argument, NULL, 'g'}, 1946 {"gmatch", no_argument, NULL, 'g'},
1119 {"textrels", no_argument, NULL, 'T'}, 1947 {"textrels", no_argument, NULL, 'T'},
1948 {"etype", a_argument, NULL, 'E'},
1949 {"bits", a_argument, NULL, 'M'},
1950 {"endian", no_argument, NULL, 'D'},
1951 {"osabi", no_argument, NULL, 'I'},
1952 {"eabi", no_argument, NULL, 'Y'},
1953 {"perms", a_argument, NULL, 'O'},
1954 {"size", no_argument, NULL, 'Z'},
1120 {"all", no_argument, NULL, 'a'}, 1955 {"all", no_argument, NULL, 'a'},
1121 {"quiet", no_argument, NULL, 'q'}, 1956 {"quiet", no_argument, NULL, 'q'},
1122 {"verbose", no_argument, NULL, 'v'}, 1957 {"verbose", no_argument, NULL, 'v'},
1123 {"format", a_argument, NULL, 'F'}, 1958 {"format", a_argument, NULL, 'F'},
1124 {"from", a_argument, NULL, 'f'}, 1959 {"from", a_argument, NULL, 'f'},
1125 {"file", a_argument, NULL, 'o'}, 1960 {"file", a_argument, NULL, 'o'},
1961 {"nocolor", no_argument, NULL, 'C'},
1126 {"nobanner", no_argument, NULL, 'B'}, 1962 {"nobanner", no_argument, NULL, 'B'},
1127 {"help", no_argument, NULL, 'h'}, 1963 {"help", no_argument, NULL, 'h'},
1128 {"version", no_argument, NULL, 'V'}, 1964 {"version", no_argument, NULL, 'V'},
1129 {NULL, no_argument, NULL, 0x0} 1965 {NULL, no_argument, NULL, 0x0}
1130}; 1966};
1131 1967
1132static const char *opts_help[] = { 1968static const char * const opts_help[] = {
1133 "Scan all directories in PATH environment", 1969 "Scan all directories in PATH environment",
1134 "Scan all directories in /etc/ld.so.conf", 1970 "Scan all directories in /etc/ld.so.conf",
1971 "Use ld.so.conf to show full path (use with -r/-n)",
1972 "Root directory (use with -l or -p)",
1135 "Scan directories recursively", 1973 "Scan directories recursively",
1136 "Don't recursively cross mount points", 1974 "Don't recursively cross mount points",
1137 "Don't scan symlinks\n", 1975 "Don't scan symlinks",
1976 "Scan archives (.a files)",
1977 "Utilize ld.so.cache to show full path (use with -r/-n)",
1978 "Try and 'fix' bad things (use with -r/-e)",
1979 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1138 "Print PaX markings", 1980 "Print PaX markings",
1139 "Print GNU_STACK/PT_LOAD markings", 1981 "Print GNU_STACK/PT_LOAD markings",
1140 "Print TEXTREL information", 1982 "Print TEXTREL information",
1141 "Print RPATH information", 1983 "Print RPATH information",
1142 "Print NEEDED information", 1984 "Print NEEDED information",
1143 "Resolve NEEDED information (use with -n)",
1144 "Print INTERP information", 1985 "Print INTERP information",
1145 "Print BIND information", 1986 "Print BIND information",
1146 "Print SONAME information", 1987 "Print SONAME information",
1147 "Find a specified symbol", 1988 "Find a specified symbol",
1989 "Find a specified section",
1148 "Find a specified library", 1990 "Find a specified library",
1149 "Use strncmp to match libraries. (use with -N)", 1991 "Use regex rather than string compare (with -s); specify twice for case insensitive",
1150 "Locate cause of TEXTREL", 1992 "Locate cause of TEXTREL",
1151 "Print all scanned info (-x -e -t -r -b)\n", 1993 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1994 "Print only ELF files matching numeric bits",
1995 "Print Endianness",
1996 "Print OSABI",
1997 "Print EABI (EM_ARM Only)",
1998 "Print only ELF files matching octal permissions",
1999 "Print ELF file size",
2000 "Print all useful/simple info\n",
1152 "Only output 'bad' things", 2001 "Only output 'bad' things",
1153 "Be verbose (can be specified more than once)", 2002 "Be verbose (can be specified more than once)",
1154 "Use specified format for output", 2003 "Use specified format for output",
1155 "Read input stream from a filename", 2004 "Read input stream from a filename",
1156 "Write output stream to a filename", 2005 "Write output stream to a filename",
2006 "Don't emit color in output",
1157 "Don't display the header", 2007 "Don't display the header",
1158 "Print this help and exit", 2008 "Print this help and exit",
1159 "Print version and exit", 2009 "Print version and exit",
1160 NULL 2010 NULL
1161}; 2011};
1163/* display usage and exit */ 2013/* display usage and exit */
1164static void usage(int status) 2014static void usage(int status)
1165{ 2015{
1166 unsigned long i; 2016 unsigned long i;
1167 printf("* Scan ELF binaries for stuff\n\n" 2017 printf("* Scan ELF binaries for stuff\n\n"
1168 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0); 2018 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1169 printf("Options: -[%s]\n", PARSE_FLAGS); 2019 printf("Options: -[%s]\n", PARSE_FLAGS);
1170 for (i = 0; long_opts[i].name; ++i) 2020 for (i = 0; long_opts[i].name; ++i) {
2021 /* first output the short flag if it has one */
2022 if (long_opts[i].val > '~')
2023 printf(" ");
2024 else
2025 printf(" -%c, ", long_opts[i].val);
2026
2027 /* then the long flag */
1171 if (long_opts[i].has_arg == no_argument) 2028 if (long_opts[i].has_arg == no_argument)
1172 printf(" -%c, --%-13s* %s\n", long_opts[i].val, 2029 printf("--%-14s", long_opts[i].name);
1173 long_opts[i].name, opts_help[i]);
1174 else 2030 else
1175 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val, 2031 printf("--%-7s <arg> ", long_opts[i].name);
1176 long_opts[i].name, opts_help[i]);
1177 2032
1178 if (status != EXIT_SUCCESS) 2033 /* finally the help text */
1179 exit(status); 2034 printf("* %s\n", opts_help[i]);
2035 }
1180 2036
1181 puts("\nThe format modifiers for the -F option are:"); 2037 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); 2038 exit(status);
1192} 2039}
1193 2040
1194/* parse command line arguments and preform needed actions */ 2041/* parse command line arguments and preform needed actions */
2042#define do_pax_state(option, flag) \
2043 if (islower(option)) { \
2044 flags &= ~PF_##flag; \
2045 flags |= PF_NO##flag; \
2046 } else { \
2047 flags &= ~PF_NO##flag; \
2048 flags |= PF_##flag; \
2049 }
1195static void parseargs(int argc, char *argv[]) 2050static int parseargs(int argc, char *argv[])
1196{ 2051{
1197 int i; 2052 int i;
1198 char *from_file = NULL; 2053 const char *from_file = NULL;
2054 int ret = 0;
2055 char load_cache_config = 0;
1199 2056
1200 opterr = 0; 2057 opterr = 0;
1201 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 2058 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1202 switch (i) { 2059 switch (i) {
1203 2060
1207 VERSION, __FILE__, __DATE__, rcsid, argv0); 2064 VERSION, __FILE__, __DATE__, rcsid, argv0);
1208 exit(EXIT_SUCCESS); 2065 exit(EXIT_SUCCESS);
1209 break; 2066 break;
1210 case 'h': usage(EXIT_SUCCESS); break; 2067 case 'h': usage(EXIT_SUCCESS); break;
1211 case 'f': 2068 case 'f':
1212 if (from_file) err("Don't specify -f twice"); 2069 if (from_file) warn("You prob don't want to specify -f twice");
1213 from_file = xstrdup(optarg); 2070 from_file = optarg;
2071 break;
2072 case 'E':
2073 match_etypes = optarg;
2074 break;
2075 case 'M':
2076 match_bits = atoi(optarg);
2077 if (match_bits == 0) {
2078 if (strcmp(optarg, "ELFCLASS32") == 0)
2079 match_bits = 32;
2080 if (strcmp(optarg, "ELFCLASS64") == 0)
2081 match_bits = 64;
2082 }
2083 break;
2084 case 'O':
2085 if (sscanf(optarg, "%o", &match_perms) == -1)
2086 match_bits = 0;
1214 break; 2087 break;
1215 case 'o': { 2088 case 'o': {
1216 FILE *fp = NULL;
1217 if ((fp = freopen(optarg, "w", stdout)) == NULL) 2089 if (freopen(optarg, "w", stdout) == NULL)
1218 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 2090 errp("Could not freopen(%s)", optarg);
1219 SET_STDOUT(fp);
1220 break; 2091 break;
1221 } 2092 }
1222 2093 case 'k':
2094 xarraypush_str(find_section_arr, optarg);
2095 break;
1223 case 's': { 2096 case 's': {
1224 if (find_sym) warn("You prob don't want to specify -s twice"); 2097 /* historically, this was comma delimited */
1225 find_sym = optarg; 2098 char *this_sym = strtok(optarg, ",");
1226 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1)); 2099 if (!this_sym) /* edge case: -s '' */
1227 sprintf(versioned_symname, "%s@", find_sym); 2100 xarraypush_str(find_sym_arr, "");
2101 while (this_sym) {
2102 xarraypush_str(find_sym_arr, this_sym);
2103 this_sym = strtok(NULL, ",");
2104 }
1228 break; 2105 break;
1229 } 2106 }
1230 case 'N': { 2107 case 'N':
1231 if (find_lib) warn("You prob don't want to specify -N twice"); 2108 xarraypush_str(find_lib_arr, optarg);
1232 find_lib = optarg;
1233 break; 2109 break;
1234 }
1235
1236 case 'F': { 2110 case 'F': {
1237 if (out_format) warn("You prob don't want to specify -F twice"); 2111 if (out_format) warn("You prob don't want to specify -F twice");
1238 out_format = optarg; 2112 out_format = optarg;
1239 break; 2113 break;
1240 } 2114 }
2115 case 'z': {
2116 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
2117 size_t x;
1241 2118
1242 case 'g': gmatch = 1; /* break; any reason we dont breal; here ? */ 2119 for (x = 0; x < strlen(optarg); x++) {
1243 case 'L': printcache = 1; break; 2120 switch (optarg[x]) {
2121 case 'p':
2122 case 'P':
2123 do_pax_state(optarg[x], PAGEEXEC);
2124 break;
2125 case 's':
2126 case 'S':
2127 do_pax_state(optarg[x], SEGMEXEC);
2128 break;
2129 case 'm':
2130 case 'M':
2131 do_pax_state(optarg[x], MPROTECT);
2132 break;
2133 case 'e':
2134 case 'E':
2135 do_pax_state(optarg[x], EMUTRAMP);
2136 break;
2137 case 'r':
2138 case 'R':
2139 do_pax_state(optarg[x], RANDMMAP);
2140 break;
2141 case 'x':
2142 case 'X':
2143 do_pax_state(optarg[x], RANDEXEC);
2144 break;
2145 default:
2146 break;
2147 }
2148 }
2149 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
2150 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
2151 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
2152 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
2153 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
2154 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
2155 setpax = flags;
2156 break;
2157 }
2158 case 'Z': show_size = 1; break;
2159 case 'g': ++g_match; break;
2160 case 'L': load_cache_config = use_ldcache = 1; break;
1244 case 'y': scan_symlink = 0; break; 2161 case 'y': scan_symlink = 0; break;
2162 case 'A': scan_archives = 1; break;
2163 case 'C': color_init(true); break;
1245 case 'B': show_banner = 0; break; 2164 case 'B': show_banner = 0; break;
1246 case 'l': scan_ldpath = 1; break; 2165 case 'l': load_cache_config = scan_ldpath = 1; break;
1247 case 'p': scan_envpath = 1; break; 2166 case 'p': scan_envpath = 1; break;
1248 case 'R': dir_recurse = 1; break; 2167 case 'R': dir_recurse = 1; break;
1249 case 'm': dir_crossmount = 0; break; 2168 case 'm': dir_crossmount = 0; break;
2169 case 'X': ++fix_elf; break;
1250 case 'x': show_pax = 1; break; 2170 case 'x': show_pax = 1; break;
1251 case 'e': show_phdr = 1; break; 2171 case 'e': show_phdr = 1; break;
1252 case 't': show_textrel = 1; break; 2172 case 't': show_textrel = 1; break;
1253 case 'r': show_rpath = 1; break; 2173 case 'r': show_rpath = 1; break;
1254 case 'n': show_needed = 1; break; 2174 case 'n': show_needed = 1; break;
1256 case 'b': show_bind = 1; break; 2176 case 'b': show_bind = 1; break;
1257 case 'S': show_soname = 1; break; 2177 case 'S': show_soname = 1; break;
1258 case 'T': show_textrels = 1; break; 2178 case 'T': show_textrels = 1; break;
1259 case 'q': be_quiet = 1; break; 2179 case 'q': be_quiet = 1; break;
1260 case 'v': be_verbose = (be_verbose % 20) + 1; break; 2180 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1261 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break; 2181 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
1262 2182 case 'D': show_endian = 1; break;
2183 case 'I': show_osabi = 1; break;
2184 case 'Y': show_eabi = 1; break;
2185 case 128:
2186 root_fd = open(optarg, O_RDONLY|O_CLOEXEC);
2187 if (root_fd == -1)
2188 err("Could not open root: %s", optarg);
2189 break;
2190 case 129: load_cache_config = use_ldpath = 1; break;
1263 case ':': 2191 case ':':
1264 err("Option missing parameter\n"); 2192 err("Option '%c' is missing parameter", optopt);
1265 case '?': 2193 case '?':
1266 err("Unknown option\n"); 2194 err("Unknown option '%c' or argument missing", optopt);
1267 default: 2195 default:
1268 err("Unhandled option '%c'", i); 2196 err("Unhandled option '%c'; please report this", i);
1269 } 2197 }
1270 } 2198 }
2199 if (show_textrels && be_verbose)
2200 has_objdump = bin_in_path("objdump");
2201 /* precompile all the regexes */
2202 if (g_match) {
2203 regex_t preg;
2204 const char *this_sym;
2205 size_t n;
2206 int flags = REG_EXTENDED | REG_NOSUB | (g_match > 1 ? REG_ICASE : 0);
1271 2207
2208 array_for_each(find_sym_arr, n, this_sym) {
2209 /* see scanelf_match_symname for logic info */
2210 switch (this_sym[0]) {
2211 case '%':
2212 while (*(this_sym++))
2213 if (*this_sym == '%') {
2214 ++this_sym;
2215 break;
2216 }
2217 break;
2218 case '+':
2219 case '-':
2220 ++this_sym;
2221 break;
2222 }
2223 if (*this_sym == '*')
2224 ++this_sym;
2225
2226 ret = regcomp(&preg, this_sym, flags);
2227 if (ret) {
2228 char err[256];
2229 regerror(ret, &preg, err, sizeof(err));
2230 err("regcomp of %s failed: %s", this_sym, err);
2231 }
2232 xarraypush(find_sym_regex_arr, &preg, sizeof(preg));
2233 }
2234 }
2235 /* flatten arrays for display */
2236 if (array_cnt(find_sym_arr))
2237 find_sym = array_flatten_str(find_sym_arr);
2238 if (array_cnt(find_lib_arr))
2239 find_lib = array_flatten_str(find_lib_arr);
2240 if (array_cnt(find_section_arr))
2241 find_section = array_flatten_str(find_section_arr);
1272 /* let the format option override all other options */ 2242 /* let the format option override all other options */
1273 if (out_format) { 2243 if (out_format) {
1274 show_pax = show_phdr = show_textrel = show_rpath = \ 2244 show_pax = show_phdr = show_textrel = show_rpath = \
1275 show_needed = show_interp = show_bind = show_soname = \ 2245 show_needed = show_interp = show_bind = show_soname = \
1276 show_textrels = 0; 2246 show_textrels = show_perms = show_endian = show_size = \
2247 show_osabi = show_eabi = 0;
1277 for (i = 0; out_format[i]; ++i) { 2248 for (i = 0; out_format[i]; ++i) {
1278 if (!IS_MODIFIER(out_format[i])) continue; 2249 if (!IS_MODIFIER(out_format[i])) continue;
1279 2250
1280 switch (out_format[++i]) { 2251 switch (out_format[++i]) {
2252 case '+': break;
1281 case '%': break; 2253 case '%': break;
1282 case '#': break; 2254 case '#': break;
1283 case 'F': break; 2255 case 'F': break;
1284 case 'p': break; 2256 case 'p': break;
1285 case 'f': break; 2257 case 'f': break;
2258 case 'k': break;
1286 case 's': break; 2259 case 's': break;
1287 case 'N': break; 2260 case 'N': break;
1288 case 'o': break; 2261 case 'o': break;
2262 case 'a': break;
2263 case 'M': break;
2264 case 'Z': show_size = 1; break;
2265 case 'D': show_endian = 1; break;
2266 case 'I': show_osabi = 1; break;
2267 case 'Y': show_eabi = 1; break;
2268 case 'O': show_perms = 1; break;
1289 case 'x': show_pax = 1; break; 2269 case 'x': show_pax = 1; break;
1290 case 'e': show_phdr = 1; break; 2270 case 'e': show_phdr = 1; break;
1291 case 't': show_textrel = 1; break; 2271 case 't': show_textrel = 1; break;
1292 case 'r': show_rpath = 1; break; 2272 case 'r': show_rpath = 1; break;
1293 case 'n': show_needed = 1; break; 2273 case 'n': show_needed = 1; break;
1294 case 'i': show_interp = 1; break; 2274 case 'i': show_interp = 1; break;
1295 case 'b': show_bind = 1; break; 2275 case 'b': show_bind = 1; break;
1296 case 'S': show_soname = 1; break; 2276 case 'S': show_soname = 1; break;
1297 case 'T': show_textrels = 1; break; 2277 case 'T': show_textrels = 1; break;
1298 default: 2278 default:
1299 err("Invalid format specifier '%c' (byte %i)", 2279 err("invalid format specifier '%c' (byte %i)",
1300 out_format[i], i+1); 2280 out_format[i], i+1);
1301 } 2281 }
1302 } 2282 }
1303 2283
1304 /* construct our default format */ 2284 /* construct our default format */
1305 } else { 2285 } else {
1306 size_t fmt_len = 30; 2286 size_t fmt_len = 30;
1307 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 2287 out_format = xmalloc(sizeof(char) * fmt_len);
2288 *out_format = '\0';
1308 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 2289 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1309 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len); 2290 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
2291 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
2292 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
2293 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
2294 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
2295 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
1310 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len); 2296 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1311 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 2297 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1312 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 2298 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1313 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 2299 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1314 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 2300 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1315 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len); 2301 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1316 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len); 2302 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1317 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len); 2303 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1318 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len); 2304 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
2305 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1319 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len); 2306 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1320 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 2307 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1321 } 2308 }
1322 if (be_verbose > 2) printf("Format: %s\n", out_format); 2309 if (be_verbose > 2) printf("Format: %s\n", out_format);
1323 2310
1324 /* now lets actually do the scanning */ 2311 /* now lets actually do the scanning */
1325 if (scan_ldpath || (show_rpath && be_quiet)) 2312 if (load_cache_config)
1326 load_ld_so_conf(); 2313 load_ld_cache_config(__PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
1327 if (scan_ldpath) scanelf_ldpath(); 2314 if (scan_ldpath) scanelf_ldpath();
1328 if (scan_envpath) scanelf_envpath(); 2315 if (scan_envpath) scanelf_envpath();
2316 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
2317 from_file = "-";
1329 if (from_file) { 2318 if (from_file) {
1330 scanelf_from_file(from_file); 2319 scanelf_from_file(from_file);
1331 free(from_file);
1332 from_file = *argv; 2320 from_file = *argv;
1333 } 2321 }
1334 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file) 2322 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1335 err("Nothing to scan !?"); 2323 err("Nothing to scan !?");
1336 while (optind < argc) { 2324 while (optind < argc) {
1337 search_path = argv[optind++]; 2325 search_path = argv[optind++];
1338 scanelf_dir(search_path); 2326 ret = scanelf_dir(search_path);
1339 } 2327 }
1340 2328
1341 /* clean up */ 2329 /* clean up */
1342 if (versioned_symname) free(versioned_symname);
1343 for (i = 0; ldpaths[i]; ++i)
1344 free(ldpaths[i]); 2330 xarrayfree(ldpaths);
2331 xarrayfree(find_sym_arr);
2332 xarrayfree(find_lib_arr);
2333 xarrayfree(find_section_arr);
2334 free(find_sym);
2335 free(find_lib);
2336 free(find_section);
2337 {
2338 size_t n;
2339 regex_t *preg;
2340 array_for_each(find_sym_regex_arr, n, preg)
2341 regfree(preg);
2342 xarrayfree(find_sym_regex_arr);
2343 }
1345 2344
1346 if (ldcache != 0) 2345 if (ldcache != 0)
1347 munmap(ldcache, ldcache_size); 2346 munmap(ldcache, ldcache_size);
1348}
1349
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; 2347 return ret;
1358} 2348}
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 2349
1369 new_len = strlen(*dst) + strlen(src); 2350static 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{ 2351{
1384 static char my_app[2]; 2352 const char *delims = " \t\n";
1385 my_app[0] = append; 2353 char **envvals = NULL;
1386 my_app[1] = '\0'; 2354 char *env, *s;
1387 xstrcat(dst, my_app, curr_len); 2355 int nentry;
1388}
1389 2356
2357 if ((env = getenv(envvar)) == NULL)
2358 return NULL;
1390 2359
2360 env = xstrdup(env);
2361 if (env == NULL)
2362 return NULL;
2363
2364 s = strtok(env, delims);
2365 if (s == NULL) {
2366 free(env);
2367 return NULL;
2368 }
2369
2370 nentry = 0;
2371 while (s != NULL) {
2372 ++nentry;
2373 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
2374 envvals[nentry-1] = s;
2375 s = strtok(NULL, delims);
2376 }
2377 envvals[nentry] = NULL;
2378
2379 /* don't want to free(env) as it contains the memory that backs
2380 * the envvals array of strings */
2381 return envvals;
2382}
2383
2384static void parseenv(void)
2385{
2386 color_init(false);
2387 qa_textrels = get_split_env("QA_TEXTRELS");
2388 qa_execstack = get_split_env("QA_EXECSTACK");
2389 qa_wx_load = get_split_env("QA_WX_LOAD");
2390}
2391
2392#ifdef __PAX_UTILS_CLEANUP
2393static void cleanup(void)
2394{
2395 free(out_format);
2396 free(qa_textrels);
2397 free(qa_execstack);
2398 free(qa_wx_load);
2399}
2400#endif
1391 2401
1392int main(int argc, char *argv[]) 2402int main(int argc, char *argv[])
1393{ 2403{
2404 int ret;
1394 if (argc < 2) 2405 if (argc < 2)
1395 usage(EXIT_FAILURE); 2406 usage(EXIT_FAILURE);
2407 parseenv();
1396 parseargs(argc, argv); 2408 ret = parseargs(argc, argv);
1397 fclose(stdout); 2409 fclose(stdout);
1398#ifdef __BOUNDS_CHECKING_ON 2410#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()"); 2411 cleanup();
2412 warn("The calls to add/delete heap should be off:\n"
2413 "\t- 1 due to the out_buffer not being freed in scanelf_fileat()\n"
2414 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
1400#endif 2415#endif
1401 return EXIT_SUCCESS; 2416 return ret;
1402} 2417}
2418
2419/* Match filename against entries in matchlist, return TRUE
2420 * if the file is listed */
2421static int file_matches_list(const char *filename, char **matchlist)
2422{
2423 char **file;
2424 char *match;
2425 char buf[__PAX_UTILS_PATH_MAX];
2426
2427 if (matchlist == NULL)
2428 return 0;
2429
2430 for (file = matchlist; *file != NULL; file++) {
2431 if (search_path) {
2432 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2433 match = buf;
2434 } else {
2435 match = *file;
2436 }
2437 if (fnmatch(match, filename, 0) == 0)
2438 return 1;
2439 }
2440 return 0;
2441}

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