/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.98 Revision 1.267
1/* 1/*
2 * Copyright 2003-2006 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 1.98 2006/01/05 03:12:07 vapier Exp $ 4 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.267 2014/10/19 07:31:20 vapier Exp $
5 * 5 *
6 * Copyright 2003-2006 Ned Ludd - <solar@gentoo.org> 6 * Copyright 2003-2012 Ned Ludd - <solar@gentoo.org>
7 * Copyright 2004-2006 Mike Frysinger - <vapier@gentoo.org> 7 * Copyright 2004-2012 Mike Frysinger - <vapier@gentoo.org>
8 */ 8 */
9 9
10static const char rcsid[] = "$Id: scanelf.c,v 1.267 2014/10/19 07:31:20 vapier Exp $";
11const char argv0[] = "scanelf";
12
10#include "paxinc.h" 13#include "paxinc.h"
11 14
12static const char *rcsid = "$Id: scanelf.c,v 1.98 2006/01/05 03:12:07 vapier Exp $";
13#define argv0 "scanelf"
14
15#define IS_MODIFIER(c) (c == '%' || c == '#') 15#define IS_MODIFIER(c) (c == '%' || c == '#' || c == '+')
16
17
18 16
19/* prototypes */ 17/* prototypes */
20static void scanelf_file(const char *filename); 18static int file_matches_list(const char *filename, char **matchlist);
21static void scanelf_dir(const char *path);
22static void scanelf_ldpath();
23static void scanelf_envpath();
24static void usage(int status);
25static void parseargs(int argc, char *argv[]);
26static char *xstrdup(const char *s);
27static void *xmalloc(size_t size);
28static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n);
29#define xstrcat(dst,src,curr_len) xstrncat(dst,src,curr_len,0)
30static inline void xchrcat(char **dst, const char append, size_t *curr_len);
31 19
32/* variables to control behavior */ 20/* variables to control behavior */
33static char *ldpaths[256]; 21static array_t _match_etypes = array_init_decl, *match_etypes = &_match_etypes;
22static array_t _ldpaths = array_init_decl, *ldpaths = &_ldpaths;
34static char scan_ldpath = 0; 23static char scan_ldpath = 0;
35static char scan_envpath = 0; 24static char scan_envpath = 0;
36static char scan_symlink = 1; 25static char scan_symlink = 1;
26static char scan_archives = 0;
37static char dir_recurse = 0; 27static char dir_recurse = 0;
38static char dir_crossmount = 1; 28static char dir_crossmount = 1;
39static char show_pax = 0; 29static char show_pax = 0;
30static char show_perms = 0;
31static char show_size = 0;
40static char show_phdr = 0; 32static char show_phdr = 0;
41static char show_textrel = 0; 33static char show_textrel = 0;
42static char show_rpath = 0; 34static char show_rpath = 0;
43static char show_needed = 0; 35static char show_needed = 0;
44static char show_interp = 0; 36static char show_interp = 0;
45static char show_bind = 0; 37static char show_bind = 0;
46static char show_soname = 0; 38static char show_soname = 0;
47static char show_textrels = 0; 39static char show_textrels = 0;
48static char show_banner = 1; 40static char show_banner = 1;
41static char show_endian = 0;
42static char show_osabi = 0;
43static char show_eabi = 0;
49static char be_quiet = 0; 44static char be_quiet = 0;
50static char be_verbose = 0; 45static char be_verbose = 0;
51static char be_wewy_wewy_quiet = 0; 46static char be_wewy_wewy_quiet = 0;
52static 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;
53static 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;
54static char *out_format = NULL; 55static char *out_format = NULL;
55static char *search_path = NULL; 56static char *search_path = NULL;
57static char fix_elf = 0;
56static char gmatch = 0; 58static char g_match = 0;
57static char printcache = 0; 59static char use_ldcache = 0;
60static char use_ldpath = 0;
58 61
62static char **qa_textrels = NULL;
63static char **qa_execstack = NULL;
64static char **qa_wx_load = NULL;
65static int root_fd = AT_FDCWD;
59 66
60caddr_t ldcache = 0; 67static int match_bits = 0;
68static unsigned int match_perms = 0;
69static void *ldcache = NULL;
61size_t ldcache_size = 0; 70static size_t ldcache_size = 0;
71static unsigned long setpax = 0UL;
62 72
73static const char *objdump;
74
75/* Find the path to a file by name. Note: we do not currently handle the
76 * empty path element correctly (should behave by searching $PWD). */
77static const char *which(const char *fname, const char *envvar)
78{
79 size_t path_len, fname_len;
80 const char *env_path;
81 char *path, *p, *ep;
82
83 p = getenv(envvar);
84 if (p)
85 return p;
86
87 env_path = getenv("PATH");
88 if (!env_path)
89 return NULL;
90
91 /* Create a copy of the $PATH that we can safely modify.
92 * Make it a little bigger so we can append "/fname".
93 * We do this twice -- once for a perm copy, and once for
94 * room at the end of the last element. */
95 path_len = strlen(env_path);
96 fname_len = strlen(fname);
97 path = xmalloc(path_len + (fname_len * 2) + 2 + 2);
98 memcpy(path, env_path, path_len + 1);
99
100 p = path + path_len + 1 + fname_len + 1;
101 *p = '/';
102 memcpy(p + 1, fname, fname_len + 1);
103
104 /* Repoint fname to the copy in the env string as it has
105 * the leading slash which we can include in a single memcpy.
106 * Increase the fname len to include the '/' and '\0'. */
107 fname = p;
108 fname_len += 2;
109
110 p = path;
111 while (p) {
112 ep = strchr(p, ':');
113 /* Append the /foo path to the current element. */
114 if (ep)
115 memcpy(ep, fname, fname_len);
116 else
117 memcpy(path + path_len, fname, fname_len);
118
119 if (access(p, R_OK) != -1)
120 return p;
121
122 p = ep;
123 if (ep) {
124 /* If not the last element, restore the chunk we clobbered. */
125 size_t offset = ep - path;
126 size_t restore = min(path_len - offset, fname_len);
127 memcpy(ep, env_path + offset, restore);
128 ++p;
129 }
130 }
131
132 free(path);
133 return NULL;
134}
135
136static FILE *fopenat_r(int dir_fd, const char *path)
137{
138 int fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
139 if (fd == -1)
140 return NULL;
141 return fdopen(fd, "re");
142}
143
144static const char *root_rel_path(const char *path)
145{
146 /*
147 * openat() will ignore the dirfd if path starts with
148 * a /, so consume all of that noise
149 *
150 * XXX: we don't handle relative paths like ../ that
151 * break out of the --root option, but for now, just
152 * don't do that :P.
153 */
154 if (root_fd != AT_FDCWD) {
155 while (*path == '/')
156 ++path;
157 if (*path == '\0')
158 path = ".";
159 }
160
161 return path;
162}
163
63/* sub-funcs for scanelf_file() */ 164/* sub-funcs for scanelf_fileat() */
64static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab) 165static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **str)
65{ 166{
66 /* find the best SHT_DYNSYM and SHT_STRTAB sections */ 167 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
168
169 /* debug sections */
170 void *symtab = elf_findsecbyname(elf, ".symtab");
171 void *strtab = elf_findsecbyname(elf, ".strtab");
172 /* runtime sections */
173 void *dynsym = elf_findsecbyname(elf, ".dynsym");
174 void *dynstr = elf_findsecbyname(elf, ".dynstr");
175
176 /*
177 * If the sections are marked NOBITS, then they don't exist, so we just
178 * skip them. This let's us work sanely with splitdebug ELFs (rather
179 * than spewing a lot of "corrupt ELF" messages later on). In malformed
180 * ELFs, the section might be wrongly set to NOBITS, but screw em.
181 *
182 * We need to make sure the debug/runtime sym/str sets are used together
183 * as they are generated in sync. Trying to mix them won't work.
184 */
67#define GET_SYMTABS(B) \ 185#define GET_SYMTABS(B) \
68 if (elf->elf_class == ELFCLASS ## B) { \ 186 if (elf->elf_class == ELFCLASS ## B) { \
69 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \ 187 Elf ## B ## _Shdr *esymtab = symtab; \
70 /* debug sections */ \ 188 Elf ## B ## _Shdr *estrtab = strtab; \
71 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \ 189 Elf ## B ## _Shdr *edynsym = dynsym; \
72 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \ 190 Elf ## B ## _Shdr *edynstr = dynstr; \
73 /* runtime sections */ \ 191 \
74 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \ 192 if (symtab && EGET(esymtab->sh_type) == SHT_NOBITS) \
75 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \ 193 symtab = NULL; \
76 if (symtab && dynsym) { \ 194 if (dynsym && EGET(edynsym->sh_type) == SHT_NOBITS) \
77 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \ 195 dynsym = NULL; \
196 if (strtab && EGET(estrtab->sh_type) == SHT_NOBITS) \
197 strtab = NULL; \
198 if (dynstr && EGET(edynstr->sh_type) == SHT_NOBITS) \
199 dynstr = NULL; \
200 \
201 /* Use the set with more symbols if both exist. */ \
202 if (symtab && dynsym && strtab && dynstr) { \
203 if (EGET(esymtab->sh_size) > EGET(edynsym->sh_size)) \
204 goto debug##B; \
78 } else { \ 205 else \
79 *sym = (void*)(symtab ? symtab : dynsym); \ 206 goto runtime##B; \
207 } else if (symtab && strtab) { \
208 debug##B: \
209 *sym = symtab; \
210 *str = strtab; \
211 return; \
212 } else if (dynsym && dynstr) { \
213 runtime##B: \
214 *sym = dynsym; \
215 *str = dynstr; \
216 return; \
80 } \ 217 } \
81 if (strtab && dynstr) { \
82 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \
83 } else { \
84 *tab = (void*)(strtab ? strtab : dynstr); \
85 } \
86 } 218 }
87 GET_SYMTABS(32) 219 GET_SYMTABS(32)
88 GET_SYMTABS(64) 220 GET_SYMTABS(64)
221
222 if (*sym && *str)
223 return;
224
225 /*
226 * damn, they're really going to make us work for it huh?
227 * reconstruct the section header info out of the dynamic
228 * tags so we can see what symbols this guy uses at runtime.
229 */
230#define GET_SYMTABS_DT(B) \
231 if (elf->elf_class == ELFCLASS ## B) { \
232 size_t i; \
233 static Elf ## B ## _Shdr sym_shdr, str_shdr; \
234 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
235 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
236 Elf ## B ## _Addr vsym, vstr, vhash, vgnu_hash; \
237 Elf ## B ## _Dyn *dyn; \
238 Elf ## B ## _Off offset; \
239 \
240 /* lookup symbols used at runtime with DT_SYMTAB / DT_STRTAB */ \
241 vsym = vstr = vhash = vgnu_hash = 0; \
242 memset(&sym_shdr, 0, sizeof(sym_shdr)); \
243 memset(&str_shdr, 0, sizeof(str_shdr)); \
244 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
245 if (EGET(phdr[i].p_type) != PT_DYNAMIC) \
246 continue; \
247 \
248 offset = EGET(phdr[i].p_offset); \
249 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
250 continue; \
251 \
252 dyn = DYN ## B (elf->vdata + offset); \
253 while (EGET(dyn->d_tag) != DT_NULL) { \
254 switch (EGET(dyn->d_tag)) { \
255 case DT_SYMTAB: vsym = EGET(dyn->d_un.d_val); break; \
256 case DT_SYMENT: sym_shdr.sh_entsize = dyn->d_un.d_val; break; \
257 case DT_STRTAB: vstr = EGET(dyn->d_un.d_val); break; \
258 case DT_STRSZ: str_shdr.sh_size = dyn->d_un.d_val; break; \
259 case DT_HASH: vhash = EGET(dyn->d_un.d_val); break; \
260 /*case DT_GNU_HASH: vgnu_hash = EGET(dyn->d_un.d_val); break;*/ \
261 } \
262 ++dyn; \
263 } \
264 if (vsym && vstr) \
265 break; \
266 } \
267 if (!vsym || !vstr || !(vhash || vgnu_hash)) \
268 return; \
269 \
270 /* calc offset into the ELF by finding the load addr of the syms */ \
271 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
272 Elf ## B ## _Addr vaddr = EGET(phdr[i].p_vaddr); \
273 Elf ## B ## _Addr filesz = EGET(phdr[i].p_filesz); \
274 offset = EGET(phdr[i].p_offset); \
275 \
276 if (EGET(phdr[i].p_type) != PT_LOAD) \
277 continue; \
278 \
279 if (vhash >= vaddr && vhash < vaddr + filesz) { \
280 /* Scan the hash table to see how many entries we have */ \
281 Elf32_Word max_sym_idx = 0; \
282 Elf32_Word *hashtbl = elf->vdata + offset + (vhash - vaddr); \
283 Elf32_Word b, nbuckets = EGET(hashtbl[0]); \
284 Elf32_Word nchains = EGET(hashtbl[1]); \
285 Elf32_Word *buckets = &hashtbl[2]; \
286 Elf32_Word *chains = &buckets[nbuckets]; \
287 Elf32_Word sym_idx; \
288 \
289 for (b = 0; b < nbuckets; ++b) { \
290 if (!buckets[b]) \
291 continue; \
292 for (sym_idx = buckets[b]; sym_idx < nchains && sym_idx; sym_idx = chains[sym_idx]) \
293 if (max_sym_idx < sym_idx) \
294 max_sym_idx = sym_idx; \
295 } \
296 ESET(sym_shdr.sh_size, sym_shdr.sh_entsize * max_sym_idx); \
297 } \
298 \
299 if (vsym >= vaddr && vsym < vaddr + filesz) { \
300 ESET(sym_shdr.sh_offset, offset + (vsym - vaddr)); \
301 *sym = &sym_shdr; \
302 } \
303 \
304 if (vstr >= vaddr && vstr < vaddr + filesz) { \
305 ESET(str_shdr.sh_offset, offset + (vstr - vaddr)); \
306 *str = &str_shdr; \
307 } \
308 } \
309 }
310 GET_SYMTABS_DT(32)
311 GET_SYMTABS_DT(64)
89} 312}
313
90static char *scanelf_file_pax(elfobj *elf, char *found_pax) 314static char *scanelf_file_pax(elfobj *elf, char *found_pax)
91{ 315{
92 static char ret[7]; 316 static char ret[7];
93 unsigned long i, shown; 317 unsigned long i, shown;
94 318
103 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 327 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
104 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 328 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
105 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 329 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
106 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \ 330 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
107 continue; \ 331 continue; \
108 if (be_quiet && (EGET(phdr[i].p_flags) == 10240)) \ 332 if (fix_elf && setpax) { \
333 /* set the paxctl flags */ \
334 ESET(phdr[i].p_flags, setpax); \
335 } \
336 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
109 continue; \ 337 continue; \
110 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \ 338 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
111 *found_pax = 1; \ 339 *found_pax = 1; \
112 ++shown; \ 340 ++shown; \
113 break; \ 341 break; \
114 } \ 342 } \
115 } 343 }
116 SHOW_PAX(32) 344 SHOW_PAX(32)
117 SHOW_PAX(64) 345 SHOW_PAX(64)
118 } 346 }
347
348 /* Note: We do not support setting EI_PAX if not PT_PAX_FLAGS
349 * was found. This is known to break ELFs on glibc systems,
350 * and mainline PaX has deprecated use of this for a long time.
351 * We could support changing PT_GNU_STACK, but that doesn't
352 * seem like it's worth the effort. #411919
353 */
119 354
120 /* fall back to EI_PAX if no PT_PAX was found */ 355 /* fall back to EI_PAX if no PT_PAX was found */
121 if (!*ret) { 356 if (!*ret) {
122 static char *paxflags; 357 static char *paxflags;
123 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf)); 358 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
136 371
137static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load) 372static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
138{ 373{
139 static char ret[12]; 374 static char ret[12];
140 char *found; 375 char *found;
141 unsigned long i, shown;
142 unsigned char multi_stack, multi_relro, multi_load; 376 unsigned long i, shown, multi_stack, multi_relro, multi_load;
143 377
144 if (!show_phdr) return NULL; 378 if (!show_phdr) return NULL;
145 379
146 memcpy(ret, "--- --- ---\0", 12); 380 memcpy(ret, "--- --- ---\0", 12);
147 381
148 shown = 0; 382 shown = 0;
149 multi_stack = multi_relro = multi_load = 0; 383 multi_stack = multi_relro = multi_load = 0;
150 384
385#define NOTE_GNU_STACK ".note.GNU-stack"
151#define SHOW_PHDR(B) \ 386#define SHOW_PHDR(B) \
152 if (elf->elf_class == ELFCLASS ## B) { \ 387 if (elf->elf_class == ELFCLASS ## B) { \
153 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 388 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
154 Elf ## B ## _Off offset; \ 389 Elf ## B ## _Off offset; \
155 uint32_t flags, check_flags; \ 390 uint32_t flags, check_flags; \
156 if (elf->phdr != NULL) { \ 391 if (elf->phdr != NULL) { \
157 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 392 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
158 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \ 393 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
159 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \ 394 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
395 if (multi_stack++) \
160 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \ 396 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
397 if (file_matches_list(elf->filename, qa_execstack)) \
398 continue; \
161 found = found_phdr; \ 399 found = found_phdr; \
162 offset = 0; \ 400 offset = 0; \
163 check_flags = PF_X; \ 401 check_flags = PF_X; \
164 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \ 402 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
403 if (multi_relro++) \
165 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \ 404 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
166 found = found_relro; \ 405 found = found_relro; \
167 offset = 4; \ 406 offset = 4; \
168 check_flags = PF_X; \ 407 check_flags = PF_X; \
169 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \ 408 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
170 if (multi_load++ > 2) warnf("%s: more than 2 PT_LOAD's !?", elf->filename); \ 409 if (file_matches_list(elf->filename, qa_wx_load)) \
410 continue; \
171 found = found_load; \ 411 found = found_load; \
172 offset = 8; \ 412 offset = 8; \
173 check_flags = PF_W|PF_X; \ 413 check_flags = PF_W|PF_X; \
174 } else \ 414 } else \
175 continue; \ 415 continue; \
176 flags = EGET(phdr[i].p_flags); \ 416 flags = EGET(phdr[i].p_flags); \
177 if (be_quiet && ((flags & check_flags) != check_flags)) \ 417 if (be_quiet && ((flags & check_flags) != check_flags)) \
178 continue; \ 418 continue; \
419 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
420 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
421 ret[3] = ret[7] = '!'; \
422 flags = EGET(phdr[i].p_flags); \
423 } \
179 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \ 424 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
180 *found = 1; \ 425 *found = 1; \
181 ++shown; \ 426 ++shown; \
182 } \ 427 } \
183 } else if (elf->shdr != NULL) { \ 428 } else if (elf->shdr != NULL) { \
184 /* no program headers which means this is prob an object file */ \ 429 /* no program headers which means this is prob an object file */ \
185 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \ 430 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
186 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \ 431 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
432 char *str; \
433 if ((void*)strtbl > elf->data_end) \
434 goto skip_this_shdr##B; \
435 /* let's flag -w/+x object files since the final ELF will most likely \
436 * need write access to the stack (who doesn't !?). so the combined \
437 * output will bring in +w automatically and that's bad. \
438 */ \
187 check_flags = SHF_WRITE|SHF_EXECINSTR; \ 439 check_flags = /*SHF_WRITE|*/SHF_EXECINSTR; \
188 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \ 440 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
189 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \ 441 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
190 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \ 442 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
191 if (!strcmp((char*)(elf->data + offset), ".note.GNU-stack")) { \ 443 str = elf->data + offset; \
444 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
445 if (!strcmp(str, NOTE_GNU_STACK)) { \
192 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \ 446 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
193 flags = EGET(shdr[i].sh_flags); \ 447 flags = EGET(shdr[i].sh_flags); \
194 if (be_quiet && ((flags & check_flags) != check_flags)) \ 448 if (be_quiet && ((flags & check_flags) != check_flags)) \
195 continue; \ 449 continue; \
196 ++*found_phdr; \ 450 ++*found_phdr; \
200 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \ 454 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
201 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \ 455 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
202 break; \ 456 break; \
203 } \ 457 } \
204 } \ 458 } \
459 skip_this_shdr##B: \
205 if (!multi_stack) { \ 460 if (!multi_stack) { \
461 if (file_matches_list(elf->filename, qa_execstack)) \
462 return NULL; \
206 *found_phdr = 1; \ 463 *found_phdr = 1; \
207 shown = 1; \ 464 shown = 1; \
208 memcpy(ret, "!WX", 3); \ 465 memcpy(ret, "!WX", 3); \
209 } \ 466 } \
210 } \ 467 } \
215 if (be_wewy_wewy_quiet || (be_quiet && !shown)) 472 if (be_wewy_wewy_quiet || (be_quiet && !shown))
216 return NULL; 473 return NULL;
217 else 474 else
218 return ret; 475 return ret;
219} 476}
477
478/*
479 * See if this ELF contains a DT_TEXTREL tag in any of its
480 * PT_DYNAMIC sections.
481 */
220static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 482static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
221{ 483{
222 static const char *ret = "TEXTREL"; 484 static const char *ret = "TEXTREL";
223 unsigned long i; 485 unsigned long i;
224 486
225 if (!show_textrel && !show_textrels) return NULL; 487 if (!show_textrel && !show_textrels) return NULL;
488
489 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
226 490
227 if (elf->phdr) { 491 if (elf->phdr) {
228#define SHOW_TEXTREL(B) \ 492#define SHOW_TEXTREL(B) \
229 if (elf->elf_class == ELFCLASS ## B) { \ 493 if (elf->elf_class == ELFCLASS ## B) { \
230 Elf ## B ## _Dyn *dyn; \ 494 Elf ## B ## _Dyn *dyn; \
231 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 495 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
232 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 496 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
233 Elf ## B ## _Off offset; \ 497 Elf ## B ## _Off offset; \
234 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 498 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
235 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 499 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
236 offset = EGET(phdr[i].p_offset); \ 500 offset = EGET(phdr[i].p_offset); \
237 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 501 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
238 dyn = DYN ## B (elf->data + offset); \ 502 dyn = DYN ## B (elf->vdata + offset); \
239 while (EGET(dyn->d_tag) != DT_NULL) { \ 503 while (EGET(dyn->d_tag) != DT_NULL) { \
240 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \ 504 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
241 *found_textrel = 1; \ 505 *found_textrel = 1; \
242 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \ 506 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
243 return (be_wewy_wewy_quiet ? NULL : ret); \ 507 return (be_wewy_wewy_quiet ? NULL : ret); \
252 if (be_quiet || be_wewy_wewy_quiet) 516 if (be_quiet || be_wewy_wewy_quiet)
253 return NULL; 517 return NULL;
254 else 518 else
255 return " - "; 519 return " - ";
256} 520}
521
522/*
523 * Scan the .text section to see if there are any relocations in it.
524 * Should rewrite this to check PT_LOAD sections that are marked
525 * Executable rather than the section named '.text'.
526 */
257static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel) 527static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
258{ 528{
259 unsigned long s, r, rmax; 529 unsigned long s, r, rmax;
260 void *symtab_void, *strtab_void, *text_void; 530 void *symtab_void, *strtab_void, *text_void;
261 531
282 Elf ## B ## _Rela *rela; \ 552 Elf ## B ## _Rela *rela; \
283 /* search the section headers for relocations */ \ 553 /* search the section headers for relocations */ \
284 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \ 554 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
285 uint32_t sh_type = EGET(shdr[s].sh_type); \ 555 uint32_t sh_type = EGET(shdr[s].sh_type); \
286 if (sh_type == SHT_REL) { \ 556 if (sh_type == SHT_REL) { \
287 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \ 557 rel = REL ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
288 rela = NULL; \ 558 rela = NULL; \
289 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \ 559 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
290 } else if (sh_type == SHT_RELA) { \ 560 } else if (sh_type == SHT_RELA) { \
291 rel = NULL; \ 561 rel = NULL; \
292 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \ 562 rela = RELA ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
293 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \ 563 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
294 } else \ 564 } else \
295 continue; \ 565 continue; \
296 /* now see if any of the relocs are in the .text */ \ 566 /* now see if any of the relocs are in the .text */ \
297 for (r = 0; r < rmax; ++r) { \ 567 for (r = 0; r < rmax; ++r) { \
312 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \ 582 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
313 if (be_verbose <= 2) continue; \ 583 if (be_verbose <= 2) continue; \
314 } else \ 584 } else \
315 *found_textrels = 1; \ 585 *found_textrels = 1; \
316 /* locate this relocation symbol name */ \ 586 /* locate this relocation symbol name */ \
317 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 587 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
588 if ((void*)sym > elf->data_end) { \
589 warn("%s: corrupt ELF symbol", elf->filename); \
590 continue; \
591 } \
318 sym_max = ELF ## B ## _R_SYM(r_info); \ 592 sym_max = ELF ## B ## _R_SYM(r_info); \
319 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \ 593 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
320 sym += sym_max; \ 594 sym += sym_max; \
321 else \ 595 else \
322 sym = NULL; \ 596 sym = NULL; \
323 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 597 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
324 /* show the raw details about this reloc */ \ 598 /* show the raw details about this reloc */ \
325 printf(" %s: ", elf->base_filename); \ 599 printf(" %s: ", elf->base_filename); \
326 if (sym && sym->st_name) \ 600 if (sym && sym->st_name) \
327 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \ 601 printf("%s", elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
328 else \ 602 else \
329 printf("(memory/fake?)"); \ 603 printf("(memory/data?)"); \
330 printf(" [0x%lX]", (unsigned long)r_offset); \ 604 printf(" [0x%lX]", (unsigned long)r_offset); \
331 /* now try to find the closest symbol that this rel is probably in */ \ 605 /* now try to find the closest symbol that this rel is probably in */ \
332 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 606 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
333 func = NULL; \ 607 func = NULL; \
334 offset_tmp = 0; \ 608 offset_tmp = 0; \
335 while (sym_max--) { \ 609 while (sym_max--) { \
336 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \ 610 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
337 func = sym; \ 611 func = sym; \
338 offset_tmp = EGET(sym->st_value); \ 612 offset_tmp = EGET(sym->st_value); \
339 } \ 613 } \
340 ++sym; \ 614 ++sym; \
341 } \ 615 } \
342 printf(" in "); \ 616 printf(" in "); \
343 if (func && func->st_name) \ 617 if (func && func->st_name) { \
344 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \ 618 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
619 if (r_offset > EGET(func->st_size)) \
620 printf("(optimized out: previous %s)", func_name); \
345 else \ 621 else \
346 printf("(NULL: fake?)"); \ 622 printf("%s", func_name); \
623 } else \
624 printf("(optimized out)"); \
347 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \ 625 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
626 if (be_verbose && objdump) { \
627 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
628 char *sysbuf; \
629 size_t syslen; \
630 const char sysfmt[] = "%s -r -R -d -w -l --start-address=0x%lX --stop-address=0x%lX %s | grep --color -i -C 3 '.*[[:space:]]%lX:[[:space:]]*R_.*'\n"; \
631 syslen = sizeof(sysfmt) + strlen(objdump) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
632 sysbuf = xmalloc(syslen); \
633 if (end_addr < r_offset) \
634 /* not uncommon when things are optimized out */ \
635 end_addr = r_offset + 0x100; \
636 snprintf(sysbuf, syslen, sysfmt, \
637 objdump, \
638 (unsigned long)offset_tmp, \
639 (unsigned long)end_addr, \
640 elf->filename, \
641 (unsigned long)r_offset); \
642 fflush(stdout); \
643 if (system(sysbuf)) {/* don't care */} \
644 fflush(stdout); \
645 free(sysbuf); \
646 } \
348 } \ 647 } \
349 } } 648 } }
350 SHOW_TEXTRELS(32) 649 SHOW_TEXTRELS(32)
351 SHOW_TEXTRELS(64) 650 SHOW_TEXTRELS(64)
352 } 651 }
354 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename); 653 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
355 654
356 return NULL; 655 return NULL;
357} 656}
358 657
359static void rpath_security_checks(elfobj *, char *);
360static void rpath_security_checks(elfobj *elf, char *item) { 658static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
659{
361 struct stat st; 660 struct stat st;
362 switch (*item) { 661 switch (*item) {
363 case '/': break; 662 case '/': break;
364 case '.': 663 case '.':
365 warnf("Security problem with relative RPATH '%s' in %s", item, elf->filename); 664 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
366 break; 665 break;
666 case ':':
367 case '\0': 667 case '\0':
368 warnf("Security problem NULL RPATH in %s", elf->filename); 668 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
369 break; 669 break;
370 case '$': 670 case '$':
371 if (fstat(elf->fd, &st) != -1) 671 if (fstat(elf->fd, &st) != -1)
372 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID)) 672 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
373 warnf("Security problem with RPATH='%s' in %s with mode set of %o", 673 warnf("Security problem with %s='%s' in %s with mode set of %o",
374 item, elf->filename, st.st_mode & 07777); 674 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
375 break; 675 break;
376 default: 676 default:
377 warnf("Maybe? sec problem with RPATH='%s' in %s", item, elf->filename); 677 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
378 break; 678 break;
379 } 679 }
380} 680}
381static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len) 681static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
382{ 682{
383 unsigned long i, s; 683 unsigned long i;
384 char *rpath, *runpath, **r; 684 char *rpath, *runpath, **r;
385 void *strtbl_void; 685 void *strtbl_void;
386 686
387 if (!show_rpath) return; 687 if (!show_rpath) return;
388 688
399 Elf ## B ## _Off offset; \ 699 Elf ## B ## _Off offset; \
400 Elf ## B ## _Xword word; \ 700 Elf ## B ## _Xword word; \
401 /* Scan all the program headers */ \ 701 /* Scan all the program headers */ \
402 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 702 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
403 /* Just scan dynamic headers */ \ 703 /* Just scan dynamic headers */ \
404 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 704 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
405 offset = EGET(phdr[i].p_offset); \ 705 offset = EGET(phdr[i].p_offset); \
406 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 706 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
407 /* Just scan dynamic RPATH/RUNPATH headers */ \ 707 /* Just scan dynamic RPATH/RUNPATH headers */ \
408 dyn = DYN ## B (elf->data + offset); \ 708 dyn = DYN ## B (elf->vdata + offset); \
409 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \ 709 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
410 if (word == DT_RPATH) { \ 710 if (word == DT_RPATH) { \
411 r = &rpath; \ 711 r = &rpath; \
412 } else if (word == DT_RUNPATH) { \ 712 } else if (word == DT_RUNPATH) { \
413 r = &runpath; \ 713 r = &runpath; \
417 } \ 717 } \
418 /* Verify the memory is somewhat sane */ \ 718 /* Verify the memory is somewhat sane */ \
419 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 719 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
420 if (offset < (Elf ## B ## _Off)elf->len) { \ 720 if (offset < (Elf ## B ## _Off)elf->len) { \
421 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \ 721 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
422 *r = (char*)(elf->data + offset); \ 722 *r = elf->data + offset; \
723 /* cache the length in case we need to nuke this section later on */ \
724 if (fix_elf) \
725 offset = strlen(*r); \
423 /* If quiet, don't output paths in ld.so.conf */ \ 726 /* If quiet, don't output paths in ld.so.conf */ \
424 if (be_quiet) { \ 727 if (be_quiet) { \
425 size_t len; \ 728 size_t len; \
426 char *start, *end; \ 729 char *start, *end; \
427 /* note that we only 'chop' off leading known paths. */ \ 730 /* note that we only 'chop' off leading known paths. */ \
428 /* since *r is read-only memory, we can only move the ptr forward. */ \ 731 /* since *r is read-only memory, we can only move the ptr forward. */ \
429 start = *r; \ 732 start = *r; \
430 /* scan each path in : delimited list */ \ 733 /* scan each path in : delimited list */ \
431 while (start) { \ 734 while (start) { \
432 rpath_security_checks(elf, start); \ 735 rpath_security_checks(elf, start, get_elfdtype(word)); \
433 end = strchr(start, ':'); \ 736 end = strchr(start, ':'); \
434 len = (end ? abs(end - start) : strlen(start)); \ 737 len = (end ? abs(end - start) : strlen(start)); \
435 for (s = 0; ldpaths[s]; ++s) { \ 738 if (use_ldcache) { \
739 size_t n; \
740 const char *ldpath; \
741 array_for_each(ldpaths, n, ldpath) \
436 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \ 742 if (!strncmp(ldpath, start, len) && !ldpath[len]) { \
437 *r = (end ? end + 1 : NULL); \ 743 *r = end; \
744 /* corner case ... if RPATH reads "/usr/lib:", we want \
745 * to show ':' rather than '' */ \
746 if (end && end[1] != '\0') \
747 (*r)++; \
438 break; \ 748 break; \
439 } \ 749 } \
440 } \ 750 } \
441 if (!*r || !ldpaths[s] || !end) \ 751 if (!*r || !end) \
442 start = NULL; \ 752 break; \
443 else \ 753 else \
444 start = start + len + 1; \ 754 start = start + len + 1; \
445 } \ 755 } \
446 } \ 756 } \
757 if (*r) { \
758 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
759 /* just nuke it */ \
760 nuke_it##B: \
761 memset(*r, 0x00, offset); \
762 *r = NULL; \
763 ESET(dyn->d_tag, DT_DEBUG); \
764 ESET(dyn->d_un.d_ptr, 0); \
765 } else if (fix_elf) { \
766 /* try to clean "bad" paths */ \
767 size_t len, tmpdir_len; \
768 char *start, *end; \
769 const char *tmpdir; \
770 start = *r; \
771 tmpdir = (getenv("TMPDIR") ? : "."); \
772 tmpdir_len = strlen(tmpdir); \
773 while (1) { \
774 end = strchr(start, ':'); \
775 if (start == end) { \
776 eat_this_path##B: \
777 len = strlen(end); \
778 memmove(start, end+1, len); \
779 start[len-1] = '\0'; \
780 end = start - 1; \
781 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
782 if (!end) { \
783 if (start == *r) \
784 goto nuke_it##B; \
785 *--start = '\0'; \
786 } else \
787 goto eat_this_path##B; \
788 } \
789 if (!end) \
790 break; \
791 start = end + 1; \
792 } \
793 if (**r == '\0') \
794 goto nuke_it##B; \
795 } \
796 if (*r) \
447 if (*r) *found_rpath = 1; \ 797 *found_rpath = 1; \
798 } \
448 } \ 799 } \
449 ++dyn; \ 800 ++dyn; \
450 } \ 801 } \
451 } } 802 } }
452 SHOW_RPATH(32) 803 SHOW_RPATH(32)
470 xstrcat(ret, (runpath ? runpath : rpath), ret_len); 821 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
471 else if (!be_quiet) 822 else if (!be_quiet)
472 xstrcat(ret, " - ", ret_len); 823 xstrcat(ret, " - ", ret_len);
473} 824}
474 825
826/* Defines can be seen in glibc's sysdeps/generic/ldconfig.h */
475#define LDSO_CACHE_MAGIC "ld.so-" 827#define LDSO_CACHE_MAGIC "ld.so-"
476#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1) 828#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
477#define LDSO_CACHE_VER "1.7.0" 829#define LDSO_CACHE_VER "1.7.0"
478#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1) 830#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
479#define FLAG_ANY -1 831#define FLAG_ANY -1
488#define FLAG_X8664_LIB64 0x0300 840#define FLAG_X8664_LIB64 0x0300
489#define FLAG_S390_LIB64 0x0400 841#define FLAG_S390_LIB64 0x0400
490#define FLAG_POWERPC_LIB64 0x0500 842#define FLAG_POWERPC_LIB64 0x0500
491#define FLAG_MIPS64_LIBN32 0x0600 843#define FLAG_MIPS64_LIBN32 0x0600
492#define FLAG_MIPS64_LIBN64 0x0700 844#define FLAG_MIPS64_LIBN64 0x0700
845#define FLAG_X8664_LIBX32 0x0800
846#define FLAG_ARM_LIBHF 0x0900
847#define FLAG_AARCH64_LIB64 0x0a00
493 848
494static char *lookup_cache_lib(elfobj *, char *); 849#if defined(__GLIBC__) || defined(__UCLIBC__)
850
495static char *lookup_cache_lib(elfobj *elf, char *fname) 851static char *lookup_cache_lib(elfobj *elf, const char *fname)
496{ 852{
497 int fd = 0; 853 int fd;
498 char *strs; 854 char *strs;
499 static char buf[_POSIX_PATH_MAX] = ""; 855 static char buf[__PAX_UTILS_PATH_MAX] = "";
500 const char *cachefile = "/etc/ld.so.cache"; 856 const char *cachefile = root_rel_path("/etc/ld.so.cache");
501 struct stat st; 857 struct stat st;
502 858
503 typedef struct { 859 typedef struct {
504 char magic[LDSO_CACHE_MAGIC_LEN]; 860 char magic[LDSO_CACHE_MAGIC_LEN];
505 char version[LDSO_CACHE_VER_LEN]; 861 char version[LDSO_CACHE_VER_LEN];
515 libentry_t *libent; 871 libentry_t *libent;
516 872
517 if (fname == NULL) 873 if (fname == NULL)
518 return NULL; 874 return NULL;
519 875
520 if (ldcache == 0) { 876 if (ldcache == NULL) {
521 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1) 877 if (fstatat(root_fd, cachefile, &st, 0))
878 return NULL;
879
880 fd = openat(root_fd, cachefile, O_RDONLY);
881 if (fd == -1)
522 return NULL; 882 return NULL;
523 883
524 /* cache these values so we only map/unmap the cache file once */ 884 /* cache these values so we only map/unmap the cache file once */
525 ldcache_size = st.st_size; 885 ldcache_size = st.st_size;
526 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0); 886 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
527
528 close(fd); 887 close(fd);
529 888
530 if (ldcache == (caddr_t)-1) 889 if (ldcache == MAP_FAILED) {
890 ldcache = NULL;
531 return NULL; 891 return NULL;
892 }
532 893
533 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN)) 894 if (memcmp(header->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN) ||
895 memcmp(header->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
896 {
897 munmap(ldcache, ldcache_size);
898 ldcache = NULL;
534 return NULL; 899 return NULL;
535 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
536 return NULL;
537 } 900 }
901 } else
902 header = ldcache;
538 903
539 header = (header_t *) ldcache;
540 libent = (libentry_t *) (ldcache + sizeof(header_t)); 904 libent = ldcache + sizeof(header_t);
541 strs = (char *) &libent[header->nlibs]; 905 strs = (char *) &libent[header->nlibs];
542 906
543 for (fd = 0; fd < header->nlibs; fd++) { 907 for (fd = 0; fd < header->nlibs; ++fd) {
544 /* this should be more fine grained, but for now we assume that 908 /* This should be more fine grained, but for now we assume that
545 * diff arches will not be cached together. and we ignore the 909 * diff arches will not be cached together, and we ignore the
546 * the different multilib mips cases. */ 910 * the different multilib mips cases.
911 */
547 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK)) 912 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
548 continue; 913 continue;
549 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK)) 914 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
550 continue; 915 continue;
551 916
552 if (strcmp(fname, strs + libent[fd].sooffset) != 0) 917 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
553 continue; 918 continue;
919
920 /* Return first hit because that is how the ldso rolls */
554 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf)); 921 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
922 break;
555 } 923 }
924
556 return buf; 925 return buf;
557} 926}
558 927
928#elif defined(__NetBSD__)
929static char *lookup_cache_lib(elfobj *elf, const char *fname)
930{
931 static char buf[__PAX_UTILS_PATH_MAX] = "";
932 static struct stat st;
933 size_t n;
934 char *ldpath;
935
936 array_for_each(ldpath, n, ldpath) {
937 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", ldpath, fname) >= sizeof(buf))
938 continue; /* if the pathname is too long, or something went wrong, ignore */
939
940 if (stat(buf, &st) != 0)
941 continue; /* if the lib doesn't exist in *ldpath, look further */
942
943 /* NetBSD doesn't actually do sanity checks, it just loads the file
944 * and if that doesn't work, continues looking in other directories.
945 * This cannot easily be safely emulated, unfortunately. For now,
946 * just assume that if it exists, it's a valid library. */
947
948 return buf;
949 }
950
951 /* not found in any path */
952 return NULL;
953}
954#else
955#ifdef __ELF__
956#warning Cache support not implemented for your target
957#endif
958static char *lookup_cache_lib(elfobj *elf, const char *fname)
959{
960 return NULL;
961}
962#endif
963
964static char *lookup_config_lib(const char *fname)
965{
966 static char buf[__PAX_UTILS_PATH_MAX] = "";
967 const char *ldpath;
968 size_t n;
969
970 array_for_each(ldpaths, n, ldpath) {
971 snprintf(buf, sizeof(buf), "%s/%s", root_rel_path(ldpath), fname);
972 if (faccessat(root_fd, buf, F_OK, AT_SYMLINK_NOFOLLOW) == 0)
973 return buf;
974 }
975
976 return NULL;
977}
559 978
560static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len) 979static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
561{ 980{
562 unsigned long i; 981 unsigned long i;
563 char *needed; 982 char *needed;
564 void *strtbl_void; 983 void *strtbl_void;
565 char *p; 984 char *p;
566 985
986 /*
987 * -n -> op==0 -> print all
988 * -N -> op==1 -> print requested
989 */
567 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL; 990 if ((op == 0 && !show_needed) || (op == 1 && !find_lib))
991 return NULL;
568 992
569 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 993 strtbl_void = elf_findsecbyname(elf, ".dynstr");
570 994
571 if (elf->phdr && strtbl_void) { 995 if (elf->phdr && strtbl_void) {
572#define SHOW_NEEDED(B) \ 996#define SHOW_NEEDED(B) \
574 Elf ## B ## _Dyn *dyn; \ 998 Elf ## B ## _Dyn *dyn; \
575 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 999 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
576 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 1000 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
577 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 1001 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
578 Elf ## B ## _Off offset; \ 1002 Elf ## B ## _Off offset; \
1003 size_t matched = 0; \
1004 /* Walk all the program headers to find the PT_DYNAMIC */ \
579 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 1005 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
580 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 1006 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) \
1007 continue; \
581 offset = EGET(phdr[i].p_offset); \ 1008 offset = EGET(phdr[i].p_offset); \
582 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 1009 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
1010 continue; \
1011 /* Walk all the dynamic tags to find NEEDED entries */ \
583 dyn = DYN ## B (elf->data + offset); \ 1012 dyn = DYN ## B (elf->vdata + offset); \
584 while (EGET(dyn->d_tag) != DT_NULL) { \ 1013 while (EGET(dyn->d_tag) != DT_NULL) { \
585 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 1014 if (EGET(dyn->d_tag) == DT_NEEDED) { \
586 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 1015 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
587 if (offset >= (Elf ## B ## _Off)elf->len) { \ 1016 if (offset >= (Elf ## B ## _Off)elf->len) { \
588 ++dyn; \ 1017 ++dyn; \
589 continue; \ 1018 continue; \
590 } \ 1019 } \
591 needed = (char*)(elf->data + offset); \ 1020 needed = elf->data + offset; \
592 if (op == 0) { \ 1021 if (op == 0) { \
1022 /* -n -> print all entries */ \
593 if (!be_wewy_wewy_quiet) { \ 1023 if (!be_wewy_wewy_quiet) { \
594 if (*found_needed) xchrcat(ret, ',', ret_len); \ 1024 if (*found_needed) xchrcat(ret, ',', ret_len); \
595 if (printcache) \ 1025 if (use_ldpath) { \
1026 if ((p = lookup_config_lib(needed)) != NULL) \
1027 needed = p; \
1028 } else if (use_ldcache) { \
596 if ((p = lookup_cache_lib(elf, needed)) != NULL) \ 1029 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
597 needed = p; \ 1030 needed = p; \
1031 } \
598 xstrcat(ret, needed, ret_len); \ 1032 xstrcat(ret, needed, ret_len); \
599 } \ 1033 } \
600 *found_needed = 1; \ 1034 *found_needed = 1; \
601 } else { \ 1035 } else { \
602 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \ 1036 /* -N -> print matching entries */ \
1037 size_t n; \
1038 const char *find_lib_name; \
1039 \
1040 array_for_each(find_lib_arr, n, find_lib_name) { \
1041 int invert = 1; \
1042 if (find_lib_name[0] == '!') \
1043 invert = 0, ++find_lib_name; \
1044 if (!strcmp(find_lib_name, needed) == invert) \
1045 ++matched; \
1046 } \
1047 \
1048 if (matched == array_cnt(find_lib_arr)) { \
603 *found_lib = 1; \ 1049 *found_lib = 1; \
604 return (be_wewy_wewy_quiet ? NULL : needed); \ 1050 return (be_wewy_wewy_quiet ? NULL : find_lib); \
605 } \ 1051 } \
606 } \ 1052 } \
607 } \ 1053 } \
608 ++dyn; \ 1054 ++dyn; \
609 } \ 1055 } \
631 *found_interp = 1; \ 1077 *found_interp = 1; \
632 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \ 1078 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
633 } 1079 }
634 SHOW_INTERP(32) 1080 SHOW_INTERP(32)
635 SHOW_INTERP(64) 1081 SHOW_INTERP(64)
1082 } else {
1083 /* Walk all the program headers to find the PT_INTERP */
1084#define SHOW_PT_INTERP(B) \
1085 if (elf->elf_class == ELFCLASS ## B) { \
1086 unsigned long i; \
1087 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1088 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1089 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1090 if (EGET(phdr[i].p_type) != PT_INTERP) \
1091 continue; \
1092 *found_interp = 1; \
1093 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(phdr[i].p_offset)); \
1094 } \
636 } 1095 }
1096 SHOW_PT_INTERP(32)
1097 SHOW_PT_INTERP(64)
1098 }
1099
637 return NULL; 1100 return NULL;
638} 1101}
639static char *scanelf_file_bind(elfobj *elf, char *found_bind) 1102static const char *scanelf_file_bind(elfobj *elf, char *found_bind)
640{ 1103{
641 unsigned long i; 1104 unsigned long i;
642 struct stat s; 1105 struct stat s;
1106 bool dynamic = false;
643 1107
644 if (!show_bind) return NULL; 1108 if (!show_bind) return NULL;
645 if (!elf->phdr) return NULL; 1109 if (!elf->phdr) return NULL;
646 1110
647#define SHOW_BIND(B) \ 1111#define SHOW_BIND(B) \
649 Elf ## B ## _Dyn *dyn; \ 1113 Elf ## B ## _Dyn *dyn; \
650 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 1114 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
651 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 1115 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
652 Elf ## B ## _Off offset; \ 1116 Elf ## B ## _Off offset; \
653 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 1117 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
654 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 1118 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1119 dynamic = true; \
655 offset = EGET(phdr[i].p_offset); \ 1120 offset = EGET(phdr[i].p_offset); \
656 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 1121 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
657 dyn = DYN ## B (elf->data + offset); \ 1122 dyn = DYN ## B (elf->vdata + offset); \
658 while (EGET(dyn->d_tag) != DT_NULL) { \ 1123 while (EGET(dyn->d_tag) != DT_NULL) { \
659 if (EGET(dyn->d_tag) == DT_BIND_NOW || \ 1124 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
660 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \ 1125 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
661 { \ 1126 { \
662 if (be_quiet) return NULL; \ 1127 if (be_quiet) return NULL; \
670 SHOW_BIND(32) 1135 SHOW_BIND(32)
671 SHOW_BIND(64) 1136 SHOW_BIND(64)
672 1137
673 if (be_wewy_wewy_quiet) return NULL; 1138 if (be_wewy_wewy_quiet) return NULL;
674 1139
1140 /* don't output anything if quiet mode and the ELF is static or not setuid */
675 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) { 1141 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
676 return NULL; 1142 return NULL;
677 } else { 1143 } else {
678 *found_bind = 1; 1144 *found_bind = 1;
679 return (char *) "LAZY"; 1145 return dynamic ? "LAZY" : "STATIC";
680 } 1146 }
681} 1147}
682static char *scanelf_file_soname(elfobj *elf, char *found_soname) 1148static char *scanelf_file_soname(elfobj *elf, char *found_soname)
683{ 1149{
684 unsigned long i; 1150 unsigned long i;
696 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 1162 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
697 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 1163 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
698 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 1164 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
699 Elf ## B ## _Off offset; \ 1165 Elf ## B ## _Off offset; \
700 /* only look for soname in shared objects */ \ 1166 /* only look for soname in shared objects */ \
701 if (ehdr->e_type != ET_DYN) \ 1167 if (EGET(ehdr->e_type) != ET_DYN) \
702 return NULL; \ 1168 return NULL; \
703 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 1169 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
704 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 1170 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
705 offset = EGET(phdr[i].p_offset); \ 1171 offset = EGET(phdr[i].p_offset); \
706 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 1172 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
707 dyn = DYN ## B (elf->data + offset); \ 1173 dyn = DYN ## B (elf->vdata + offset); \
708 while (EGET(dyn->d_tag) != DT_NULL) { \ 1174 while (EGET(dyn->d_tag) != DT_NULL) { \
709 if (EGET(dyn->d_tag) == DT_SONAME) { \ 1175 if (EGET(dyn->d_tag) == DT_SONAME) { \
710 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 1176 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
711 if (offset >= (Elf ## B ## _Off)elf->len) { \ 1177 if (offset >= (Elf ## B ## _Off)elf->len) { \
712 ++dyn; \ 1178 ++dyn; \
713 continue; \ 1179 continue; \
714 } \ 1180 } \
715 soname = (char*)(elf->data + offset); \ 1181 soname = elf->data + offset; \
716 *found_soname = 1; \ 1182 *found_soname = 1; \
717 return (be_wewy_wewy_quiet ? NULL : soname); \ 1183 return (be_wewy_wewy_quiet ? NULL : soname); \
718 } \ 1184 } \
719 ++dyn; \ 1185 ++dyn; \
720 } \ 1186 } \
723 SHOW_SONAME(64) 1189 SHOW_SONAME(64)
724 } 1190 }
725 1191
726 return NULL; 1192 return NULL;
727} 1193}
1194
1195/*
1196 * We support the symbol form:
1197 * [%[modifiers]%][[+-]<symbol name>][,[.....]]
1198 * If the symbol name is empty, then all symbols are matched.
1199 * If the symbol name is a glob ("*"), then all symbols are dumped (debug).
1200 * Do not rely on this output format at all.
1201 * Otherwise the symbol name is used to search (either regex or string compare).
1202 * If the first char of the symbol name is a plus ("+"), then only match
1203 * defined symbols. If it's a minus ("-"), only match undefined symbols.
1204 * Putting modifiers in between the percent signs allows for more in depth
1205 * filters. There are groups of modifiers. If you don't specify a member
1206 * of a group, then all types in that group are matched. The current
1207 * groups and their types are:
1208 * STT group: STT_NOTYPE:n STT_OBJECT:o STT_FUNC:f STT_FILE:F
1209 * STB group: STB_LOCAL:l STB_GLOBAL:g STB_WEAK:w
1210 * STV group: STV_DEFAULT:p STV_INTERNAL:i STV_HIDDEN:h STV_PROTECTED:P
1211 * SHN group: SHN_UNDEF:u SHN_ABS:a SHN_COMMON:c {defined}:d
1212 * The "defined" value in the SHN group does not correspond to a SHN_xxx define.
1213 * You can search for multiple symbols at once by seperating with a comma (",").
1214 *
1215 * Some examples:
1216 * ELFs with a weak function "foo":
1217 * scanelf -s %wf%foo <ELFs>
1218 * ELFs that define the symbol "main":
1219 * scanelf -s +main <ELFs>
1220 * scanelf -s %d%main <ELFs>
1221 * ELFs that refer to the undefined symbol "brk":
1222 * scanelf -s -brk <ELFs>
1223 * scanelf -s %u%brk <ELFs>
1224 * All global defined objects in an ELF:
1225 * scanelf -s %ogd% <ELF>
1226 */
1227static void
1228scanelf_match_symname(elfobj *elf, char *found_sym, char **ret, size_t *ret_len, const char *symname,
1229 unsigned int stt, unsigned int stb, unsigned int stv, unsigned int shn, unsigned long size)
1230{
1231 const char *this_sym;
1232 size_t n;
1233
1234 array_for_each(find_sym_arr, n, this_sym) {
1235 bool inc_notype, inc_object, inc_func, inc_file,
1236 inc_local, inc_global, inc_weak,
1237 inc_visdef, inc_intern, inc_hidden, inc_prot,
1238 inc_def, inc_undef, inc_abs, inc_common;
1239
1240 /* symbol selection! */
1241 inc_notype = inc_object = inc_func = inc_file =
1242 inc_local = inc_global = inc_weak =
1243 inc_visdef = inc_intern = inc_hidden = inc_prot =
1244 inc_def = inc_undef = inc_abs = inc_common =
1245 (*this_sym != '%');
1246
1247 /* parse the contents of %...% */
1248 if (!inc_notype) {
1249 while (*(this_sym++)) {
1250 if (*this_sym == '%') {
1251 ++this_sym;
1252 break;
1253 }
1254 switch (*this_sym) {
1255 case 'n': inc_notype = true; break;
1256 case 'o': inc_object = true; break;
1257 case 'f': inc_func = true; break;
1258 case 'F': inc_file = true; break;
1259 case 'l': inc_local = true; break;
1260 case 'g': inc_global = true; break;
1261 case 'w': inc_weak = true; break;
1262 case 'p': inc_visdef = true; break;
1263 case 'i': inc_intern = true; break;
1264 case 'h': inc_hidden = true; break;
1265 case 'P': inc_prot = true; break;
1266 case 'd': inc_def = true; break;
1267 case 'u': inc_undef = true; break;
1268 case 'a': inc_abs = true; break;
1269 case 'c': inc_common = true; break;
1270 default: err("invalid symbol selector '%c'", *this_sym);
1271 }
1272 }
1273
1274 /* If no types are matched, not match all */
1275 if (!inc_notype && !inc_object && !inc_func && !inc_file)
1276 inc_notype = inc_object = inc_func = inc_file = true;
1277 if (!inc_local && !inc_global && !inc_weak)
1278 inc_local = inc_global = inc_weak = true;
1279 if (!inc_visdef && !inc_intern && !inc_hidden && !inc_prot)
1280 inc_visdef = inc_intern = inc_hidden = inc_prot = true;
1281 if (!inc_def && !inc_undef && !inc_abs && !inc_common)
1282 inc_def = inc_undef = inc_abs = inc_common = true;
1283
1284 /* backwards compat for defined/undefined short hand */
1285 } else if (*this_sym == '+') {
1286 inc_undef = false;
1287 ++this_sym;
1288 } else if (*this_sym == '-') {
1289 inc_def = inc_abs = inc_common = false;
1290 ++this_sym;
1291 }
1292
1293 /* filter symbols */
1294 if ((!inc_notype && stt == STT_NOTYPE ) || \
1295 (!inc_object && stt == STT_OBJECT ) || \
1296 (!inc_func && stt == STT_FUNC ) || \
1297 (!inc_file && stt == STT_FILE ) || \
1298 (!inc_local && stb == STB_LOCAL ) || \
1299 (!inc_global && stb == STB_GLOBAL ) || \
1300 (!inc_weak && stb == STB_WEAK ) || \
1301 (!inc_visdef && stv == STV_DEFAULT ) || \
1302 (!inc_intern && stv == STV_INTERNAL ) || \
1303 (!inc_hidden && stv == STV_HIDDEN ) || \
1304 (!inc_prot && stv == STV_PROTECTED) || \
1305 (!inc_def && shn && shn < SHN_LORESERVE) || \
1306 (!inc_undef && shn == SHN_UNDEF ) || \
1307 (!inc_abs && shn == SHN_ABS ) || \
1308 (!inc_common && shn == SHN_COMMON ))
1309 continue;
1310
1311 if (*this_sym == '*') {
1312 /* a "*" symbol gets you debug output */
1313 printf("%s(%s) %5lX %-15s %-15s %-15s %-15s %s\n",
1314 ((*found_sym == 0) ? "\n\t" : "\t"),
1315 elf->base_filename,
1316 size,
1317 get_elfstttype(stt),
1318 get_elfstbtype(stb),
1319 get_elfstvtype(stv),
1320 get_elfshntype(shn),
1321 symname);
1322 goto matched;
1323
1324 } else {
1325 if (g_match) {
1326 /* regex match the symbol */
1327 if (regexec(find_sym_regex_arr->eles[n], symname, 0, NULL, 0) == REG_NOMATCH)
1328 continue;
1329
1330 } else if (*this_sym) {
1331 /* give empty symbols a "pass", else do a normal compare */
1332 const size_t len = strlen(this_sym);
1333 if (!(strncmp(this_sym, symname, len) == 0 &&
1334 /* Accept unversioned symbol names */
1335 (symname[len] == '\0' || symname[len] == '@')))
1336 continue;
1337 }
1338
1339 if (be_semi_verbose) {
1340 char buf[1024];
1341 snprintf(buf, sizeof(buf), "%lX %s %s",
1342 size,
1343 get_elfstttype(stt),
1344 this_sym);
1345 *ret = xstrdup(buf);
1346 } else {
1347 if (*ret) xchrcat(ret, ',', ret_len);
1348 xstrcat(ret, symname, ret_len);
1349 }
1350
1351 goto matched;
1352 }
1353 }
1354
1355 return;
1356
1357 matched:
1358 *found_sym = 1;
1359}
1360
728static char *scanelf_file_sym(elfobj *elf, char *found_sym) 1361static const char *scanelf_file_sym(elfobj *elf, char *found_sym)
729{ 1362{
730 unsigned long i;
731 char *ret; 1363 char *ret;
732 void *symtab_void, *strtab_void; 1364 void *symtab_void, *strtab_void;
733 1365
734 if (!find_sym) return NULL; 1366 if (!find_sym) return NULL;
735 ret = find_sym; 1367 ret = NULL;
736 1368
737 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void); 1369 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
738 1370
739 if (symtab_void && strtab_void) { 1371 if (symtab_void && strtab_void) {
740#define FIND_SYM(B) \ 1372#define FIND_SYM(B) \
741 if (elf->elf_class == ELFCLASS ## B) { \ 1373 if (elf->elf_class == ELFCLASS ## B) { \
742 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 1374 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
743 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 1375 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
744 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 1376 Elf ## B ## _Sym *sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
745 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 1377 Elf ## B ## _Word i, cnt = EGET(symtab->sh_entsize); \
746 char *symname; \ 1378 char *symname; \
1379 size_t ret_len = 0; \
1380 if (cnt) \
1381 cnt = EGET(symtab->sh_size) / cnt; \
747 for (i = 0; i < cnt; ++i) { \ 1382 for (i = 0; i < cnt; ++i) { \
1383 if ((void*)sym > elf->data_end) { \
1384 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1385 goto break_out; \
1386 } \
748 if (sym->st_name) { \ 1387 if (sym->st_name) { \
1388 /* make sure the symbol name is in acceptable memory range */ \
749 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 1389 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
750 if (*find_sym == '*') { \ 1390 if ((void*)symname > elf->data_end) { \
751 printf("%s(%s) %5lX %15s %s\n", \ 1391 warnf("%s: corrupt ELF symbols", elf->filename); \
752 ((*found_sym == 0) ? "\n\t" : "\t"), \ 1392 ++sym; \
753 elf->base_filename, \ 1393 continue; \
754 (unsigned long)sym->st_size, \
755 get_elfstttype(sym->st_info), \
756 symname); \
757 *found_sym = 1; \
758 } else { \
759 char *this_sym, *next_sym; \
760 this_sym = find_sym; \
761 do { \
762 next_sym = strchr(this_sym, ','); \
763 if (next_sym == NULL) \
764 next_sym = this_sym + strlen(this_sym); \
765 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
766 (strcmp(symname, versioned_symname) == 0)) { \
767 ret = this_sym; \
768 (*found_sym)++; \
769 goto break_out; \
770 } \
771 this_sym = next_sym + 1; \
772 } while (*next_sym != '\0'); \
773 } \ 1394 } \
1395 scanelf_match_symname(elf, found_sym, \
1396 &ret, &ret_len, symname, \
1397 ELF##B##_ST_TYPE(EGET(sym->st_info)), \
1398 ELF##B##_ST_BIND(EGET(sym->st_info)), \
1399 ELF##B##_ST_VISIBILITY(EGET(sym->st_other)), \
1400 EGET(sym->st_shndx), \
1401 /* st_size can be 64bit, but no one is really that big, so screw em */ \
1402 EGET(sym->st_size)); \
774 } \ 1403 } \
775 ++sym; \ 1404 ++sym; \
776 } } 1405 } \
1406 }
777 FIND_SYM(32) 1407 FIND_SYM(32)
778 FIND_SYM(64) 1408 FIND_SYM(64)
779 } 1409 }
780 1410
781break_out: 1411break_out:
784 if (*find_sym != '*' && *found_sym) 1414 if (*find_sym != '*' && *found_sym)
785 return ret; 1415 return ret;
786 if (be_quiet) 1416 if (be_quiet)
787 return NULL; 1417 return NULL;
788 else 1418 else
789 return (char *)" - "; 1419 return " - ";
790} 1420}
1421
1422static const char *scanelf_file_sections(elfobj *elf, char *found_section)
1423{
1424 if (!find_section)
1425 return NULL;
1426
1427#define FIND_SECTION(B) \
1428 if (elf->elf_class == ELFCLASS ## B) { \
1429 size_t matched, n; \
1430 int invert; \
1431 const char *section_name; \
1432 Elf ## B ## _Shdr *section; \
1433 \
1434 matched = 0; \
1435 array_for_each(find_section_arr, n, section_name) { \
1436 invert = (*section_name == '!' ? 1 : 0); \
1437 section = SHDR ## B (elf_findsecbyname(elf, section_name + invert)); \
1438 if ((section == NULL && invert) || (section != NULL && !invert)) \
1439 ++matched; \
1440 } \
1441 \
1442 if (matched == array_cnt(find_section_arr)) \
1443 *found_section = 1; \
1444 }
1445 FIND_SECTION(32)
1446 FIND_SECTION(64)
1447
1448 if (be_wewy_wewy_quiet)
1449 return NULL;
1450
1451 if (*found_section)
1452 return find_section;
1453
1454 if (be_quiet)
1455 return NULL;
1456 else
1457 return " - ";
1458}
1459
791/* scan an elf file and show all the fun stuff */ 1460/* scan an elf file and show all the fun stuff */
792#define prints(str) write(fileno(stdout), str, strlen(str)) 1461#define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
793static void scanelf_file(const char *filename) 1462static int scanelf_elfobj(elfobj *elf)
794{ 1463{
795 unsigned long i; 1464 unsigned long i;
796 char found_pax, found_phdr, found_relro, found_load, found_textrel, 1465 char found_pax, found_phdr, found_relro, found_load, found_textrel,
797 found_rpath, found_needed, found_interp, found_bind, found_soname, 1466 found_rpath, found_needed, found_interp, found_bind, found_soname,
798 found_sym, found_lib, found_file, found_textrels; 1467 found_sym, found_lib, found_file, found_textrels, found_section;
799 elfobj *elf;
800 struct stat st;
801 static char *out_buffer = NULL; 1468 static char *out_buffer = NULL;
802 static size_t out_len; 1469 static size_t out_len;
803 1470
804 /* make sure 'filename' exists */
805 if (lstat(filename, &st) == -1) {
806 if (be_verbose > 2) printf("%s: does not exist\n", filename);
807 return;
808 }
809 /* always handle regular files and handle symlinked files if no -y */
810 if (S_ISLNK(st.st_mode)) {
811 if (!scan_symlink) return;
812 stat(filename, &st);
813 }
814 if (!S_ISREG(st.st_mode)) {
815 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
816 return;
817 }
818
819 found_pax = found_phdr = found_relro = found_load = found_textrel = \ 1471 found_pax = found_phdr = found_relro = found_load = found_textrel = \
820 found_rpath = found_needed = found_interp = found_bind = found_soname = \ 1472 found_rpath = found_needed = found_interp = found_bind = found_soname = \
821 found_sym = found_lib = found_file = found_textrels = 0; 1473 found_sym = found_lib = found_file = found_textrels = found_section = 0;
822 1474
823 /* verify this is real ELF */
824 if ((elf = readelf(filename)) == NULL) {
825 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
826 return;
827 }
828
829 if (be_verbose > 1) 1475 if (be_verbose > 2)
830 printf("%s: scanning file {%s,%s}\n", filename, 1476 printf("%s: scanning file {%s,%s}\n", elf->filename,
831 get_elfeitype(EI_CLASS, elf->elf_class), 1477 get_elfeitype(EI_CLASS, elf->elf_class),
832 get_elfeitype(EI_DATA, elf->data[EI_DATA])); 1478 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
833 else if (be_verbose) 1479 else if (be_verbose > 1)
834 printf("%s: scanning file\n", filename); 1480 printf("%s: scanning file\n", elf->filename);
835 1481
836 /* init output buffer */ 1482 /* init output buffer */
837 if (!out_buffer) { 1483 if (!out_buffer) {
838 out_len = sizeof(char) * 80; 1484 out_len = sizeof(char) * 80;
839 out_buffer = (char*)xmalloc(out_len); 1485 out_buffer = xmalloc(out_len);
840 } 1486 }
841 *out_buffer = '\0'; 1487 *out_buffer = '\0';
842 1488
843 /* show the header */ 1489 /* show the header */
844 if (!be_quiet && show_banner) { 1490 if (!be_quiet && show_banner) {
845 for (i = 0; out_format[i]; ++i) { 1491 for (i = 0; out_format[i]; ++i) {
846 if (!IS_MODIFIER(out_format[i])) continue; 1492 if (!IS_MODIFIER(out_format[i])) continue;
847 1493
848 switch (out_format[++i]) { 1494 switch (out_format[++i]) {
1495 case '+': break;
849 case '%': break; 1496 case '%': break;
850 case '#': break; 1497 case '#': break;
851 case 'F': 1498 case 'F':
852 case 'p': 1499 case 'p':
853 case 'f': prints("FILE "); found_file = 1; break; 1500 case 'f': prints("FILE "); found_file = 1; break;
854 case 'o': prints(" TYPE "); break; 1501 case 'o': prints(" TYPE "); break;
855 case 'x': prints(" PAX "); break; 1502 case 'x': prints(" PAX "); break;
856 case 'e': prints("STK/REL/PTL "); break; 1503 case 'e': prints("STK/REL/PTL "); break;
857 case 't': prints("TEXTREL "); break; 1504 case 't': prints("TEXTREL "); break;
858 case 'r': prints("RPATH "); break; 1505 case 'r': prints("RPATH "); break;
1506 case 'M': prints("CLASS "); break;
1507 case 'l':
859 case 'n': prints("NEEDED "); break; 1508 case 'n': prints("NEEDED "); break;
860 case 'i': prints("INTERP "); break; 1509 case 'i': prints("INTERP "); break;
861 case 'b': prints("BIND "); break; 1510 case 'b': prints("BIND "); break;
1511 case 'Z': prints("SIZE "); break;
862 case 'S': prints("SONAME "); break; 1512 case 'S': prints("SONAME "); break;
863 case 's': prints("SYM "); break; 1513 case 's': prints("SYM "); break;
864 case 'N': prints("LIB "); break; 1514 case 'N': prints("LIB "); break;
865 case 'T': prints("TEXTRELS "); break; 1515 case 'T': prints("TEXTRELS "); break;
1516 case 'k': prints("SECTION "); break;
1517 case 'a': prints("ARCH "); break;
1518 case 'I': prints("OSABI "); break;
1519 case 'Y': prints("EABI "); break;
1520 case 'O': prints("PERM "); break;
1521 case 'D': prints("ENDIAN "); break;
866 default: warnf("'%c' has no title ?", out_format[i]); 1522 default: warnf("'%c' has no title ?", out_format[i]);
867 } 1523 }
868 } 1524 }
869 if (!found_file) prints("FILE "); 1525 if (!found_file) prints("FILE ");
870 prints("\n"); 1526 prints("\n");
874 1530
875 /* dump all the good stuff */ 1531 /* dump all the good stuff */
876 for (i = 0; out_format[i]; ++i) { 1532 for (i = 0; out_format[i]; ++i) {
877 const char *out; 1533 const char *out;
878 const char *tmp; 1534 const char *tmp;
879 1535 static char ubuf[sizeof(unsigned long)*2];
880 /* make sure we trim leading spaces in quiet mode */
881 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
882 *out_buffer = '\0';
883
884 if (!IS_MODIFIER(out_format[i])) { 1536 if (!IS_MODIFIER(out_format[i])) {
885 xchrcat(&out_buffer, out_format[i], &out_len); 1537 xchrcat(&out_buffer, out_format[i], &out_len);
886 continue; 1538 continue;
887 } 1539 }
888 1540
889 out = NULL; 1541 out = NULL;
890 be_wewy_wewy_quiet = (out_format[i] == '#'); 1542 be_wewy_wewy_quiet = (out_format[i] == '#');
1543 be_semi_verbose = (out_format[i] == '+');
891 switch (out_format[++i]) { 1544 switch (out_format[++i]) {
1545 case '+':
892 case '%': 1546 case '%':
893 case '#': 1547 case '#':
894 xchrcat(&out_buffer, out_format[i], &out_len); break; 1548 xchrcat(&out_buffer, out_format[i], &out_len); break;
895 case 'F': 1549 case 'F':
896 found_file = 1; 1550 found_file = 1;
897 if (be_wewy_wewy_quiet) break; 1551 if (be_wewy_wewy_quiet) break;
898 xstrcat(&out_buffer, filename, &out_len); 1552 xstrcat(&out_buffer, elf->filename, &out_len);
899 break; 1553 break;
900 case 'p': 1554 case 'p':
901 found_file = 1; 1555 found_file = 1;
902 if (be_wewy_wewy_quiet) break; 1556 if (be_wewy_wewy_quiet) break;
903 tmp = filename; 1557 tmp = elf->filename;
904 if (search_path) { 1558 if (search_path) {
905 ssize_t len_search = strlen(search_path); 1559 ssize_t len_search = strlen(search_path);
906 ssize_t len_file = strlen(filename); 1560 ssize_t len_file = strlen(elf->filename);
907 if (!strncmp(filename, search_path, len_search) && \ 1561 if (!strncmp(elf->filename, search_path, len_search) && \
908 len_file > len_search) 1562 len_file > len_search)
909 tmp += len_search; 1563 tmp += len_search;
910 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++; 1564 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
911 } 1565 }
912 xstrcat(&out_buffer, tmp, &out_len); 1566 xstrcat(&out_buffer, tmp, &out_len);
913 break; 1567 break;
914 case 'f': 1568 case 'f':
915 found_file = 1; 1569 found_file = 1;
916 if (be_wewy_wewy_quiet) break; 1570 if (be_wewy_wewy_quiet) break;
917 tmp = strrchr(filename, '/'); 1571 tmp = strrchr(elf->filename, '/');
918 tmp = (tmp == NULL ? filename : tmp+1); 1572 tmp = (tmp == NULL ? elf->filename : tmp+1);
919 xstrcat(&out_buffer, tmp, &out_len); 1573 xstrcat(&out_buffer, tmp, &out_len);
920 break; 1574 break;
921 case 'o': out = get_elfetype(elf); break; 1575 case 'o': out = get_elfetype(elf); break;
922 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1576 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
923 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break; 1577 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
924 case 't': out = scanelf_file_textrel(elf, &found_textrel); break; 1578 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
925 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break; 1579 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
926 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break; 1580 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1581 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1582 case 'D': out = get_endian(elf); break;
1583 case 'O': out = strfileperms(elf->filename); break;
927 case 'n': 1584 case 'n':
928 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break; 1585 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
929 case 'i': out = scanelf_file_interp(elf, &found_interp); break; 1586 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
930 case 'b': out = scanelf_file_bind(elf, &found_bind); break; 1587 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
931 case 'S': out = scanelf_file_soname(elf, &found_soname); break; 1588 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
932 case 's': out = scanelf_file_sym(elf, &found_sym); break; 1589 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1590 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1591 case 'a': out = get_elfemtype(elf); break;
1592 case 'I': out = get_elfosabi(elf); break;
1593 case 'Y': out = get_elf_eabi(elf); break;
1594 case 'Z': snprintf(ubuf, sizeof(ubuf), "%lu", (unsigned long)elf->len); out = ubuf; break;;
933 default: warnf("'%c' has no scan code?", out_format[i]); 1595 default: warnf("'%c' has no scan code?", out_format[i]);
934 } 1596 }
935 if (out) { 1597 if (out)
936 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
937 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
938 xstrncat(&out_buffer, out, &out_len, (tmp-out));
939 else
940 xstrcat(&out_buffer, out, &out_len); 1598 xstrcat(&out_buffer, out, &out_len);
941 }
942 } 1599 }
943 1600
944#define FOUND_SOMETHING() \ 1601#define FOUND_SOMETHING() \
945 (found_pax || found_phdr || found_relro || found_load || found_textrel || \ 1602 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
946 found_rpath || found_needed || found_interp || found_bind || \ 1603 found_rpath || found_needed || found_interp || found_bind || \
947 found_soname || found_sym || found_lib || found_textrels) 1604 found_soname || found_sym || found_lib || found_textrels || found_section )
948 1605
949 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) { 1606 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
950 xchrcat(&out_buffer, ' ', &out_len); 1607 xchrcat(&out_buffer, ' ', &out_len);
951 xstrcat(&out_buffer, filename, &out_len); 1608 xstrcat(&out_buffer, elf->filename, &out_len);
952 } 1609 }
953 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) { 1610 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
954 puts(out_buffer); 1611 puts(out_buffer);
955 fflush(stdout); 1612 fflush(stdout);
956 } 1613 }
957 1614
1615 return 0;
1616}
1617
1618/* scan a single elf */
1619static int scanelf_elf(const char *filename, int fd, size_t len)
1620{
1621 int ret = 1;
1622 size_t n;
1623 const char *match_etype;
1624 elfobj *elf;
1625
1626 /* Verify this is a real ELF */
1627 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1628 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1629 return 2;
1630 }
1631
1632 /* Possibly filter based on ELF bitness */
1633 switch (match_bits) {
1634 case 32:
1635 if (elf->elf_class != ELFCLASS32)
1636 goto done;
1637 break;
1638 case 64:
1639 if (elf->elf_class != ELFCLASS64)
1640 goto done;
1641 break;
1642 }
1643
1644 /* Possibly filter based on the ELF's e_type field */
1645 array_for_each(match_etypes, n, match_etype)
1646 if (etype_lookup(match_etype) == get_etype(elf))
1647 goto scanit;
1648 if (array_cnt(match_etypes))
1649 goto done;
1650
1651 scanit:
1652 ret = scanelf_elfobj(elf);
1653
1654 done:
958 unreadelf(elf); 1655 unreadelf(elf);
1656 return ret;
1657}
1658
1659/* scan an archive of elfs */
1660static int scanelf_archive(const char *filename, int fd, size_t len)
1661{
1662 archive_handle *ar;
1663 archive_member *m;
1664 char *ar_buffer;
1665 elfobj *elf;
1666
1667 ar = ar_open_fd(filename, fd);
1668 if (ar == NULL)
1669 return 1;
1670
1671 ar_buffer = mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1672 while ((m = ar_next(ar)) != NULL) {
1673 off_t cur_pos = lseek(fd, 0, SEEK_CUR);
1674 if (cur_pos == -1)
1675 errp("lseek() failed");
1676 elf = readelf_buffer(m->name, ar_buffer + cur_pos, m->size);
1677 if (elf) {
1678 scanelf_elfobj(elf);
1679 unreadelf(elf);
1680 }
1681 }
1682 munmap(ar_buffer, len);
1683
1684 return 0;
1685}
1686/* scan a file which may be an elf or an archive or some other magical beast */
1687static int scanelf_fileat(int dir_fd, const char *filename, const struct stat *st_cache)
1688{
1689 const struct stat *st = st_cache;
1690 struct stat symlink_st;
1691 int fd;
1692
1693 /* always handle regular files and handle symlinked files if no -y */
1694 if (S_ISLNK(st->st_mode)) {
1695 if (!scan_symlink)
1696 return 1;
1697 fstatat(dir_fd, filename, &symlink_st, 0);
1698 st = &symlink_st;
1699 }
1700
1701 if (!S_ISREG(st->st_mode)) {
1702 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1703 return 1;
1704 }
1705
1706 if (match_perms) {
1707 if ((st->st_mode | match_perms) != st->st_mode)
1708 return 1;
1709 }
1710 fd = openat(dir_fd, filename, (fix_elf ? O_RDWR : O_RDONLY) | O_CLOEXEC);
1711 if (fd == -1) {
1712 if (fix_elf && errno == ETXTBSY)
1713 warnp("%s: could not fix", filename);
1714 else if (be_verbose > 2)
1715 printf("%s: skipping file: %s\n", filename, strerror(errno));
1716 return 1;
1717 }
1718
1719 if (scanelf_elf(filename, fd, st->st_size) == 2) {
1720 /* if it isn't an ELF, maybe it's an .a archive */
1721 if (scan_archives)
1722 scanelf_archive(filename, fd, st->st_size);
1723
1724 /*
1725 * unreadelf() implicitly closes its fd, so only close it
1726 * when we are returning it in the non-ELF case
1727 */
1728 close(fd);
1729 }
1730
1731 return 0;
959} 1732}
960 1733
961/* scan a directory for ET_EXEC files and print when we find one */ 1734/* scan a directory for ET_EXEC files and print when we find one */
962static void scanelf_dir(const char *path) 1735static int scanelf_dirat(int dir_fd, const char *path)
963{ 1736{
964 register DIR *dir; 1737 register DIR *dir;
965 register struct dirent *dentry; 1738 register struct dirent *dentry;
966 struct stat st_top, st; 1739 struct stat st_top, st;
967 char buf[_POSIX_PATH_MAX]; 1740 char buf[__PAX_UTILS_PATH_MAX], *subpath;
968 size_t pathlen = 0, len = 0; 1741 size_t pathlen = 0, len = 0;
1742 int ret = 0;
1743 int subdir_fd;
969 1744
970 /* make sure path exists */ 1745 /* make sure path exists */
971 if (lstat(path, &st_top) == -1) { 1746 if (fstatat(dir_fd, path, &st_top, AT_SYMLINK_NOFOLLOW) == -1) {
972 if (be_verbose > 2) printf("%s: does not exist\n", path); 1747 if (be_verbose > 2) printf("%s: does not exist\n", path);
973 return; 1748 return 1;
974 } 1749 }
975 1750
976 /* ok, if it isn't a directory, assume we can open it */ 1751 /* ok, if it isn't a directory, assume we can open it */
977 if (!S_ISDIR(st_top.st_mode)) { 1752 if (!S_ISDIR(st_top.st_mode))
978 scanelf_file(path); 1753 return scanelf_fileat(dir_fd, path, &st_top);
979 return;
980 }
981 1754
982 /* now scan the dir looking for fun stuff */ 1755 /* now scan the dir looking for fun stuff */
983 if ((dir = opendir(path)) == NULL) { 1756 subdir_fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
984 warnf("could not opendir %s: %s", path, strerror(errno)); 1757 if (subdir_fd == -1)
1758 dir = NULL;
1759 else
1760 dir = fdopendir(subdir_fd);
1761 if (dir == NULL) {
1762 if (subdir_fd != -1)
1763 close(subdir_fd);
1764 else if (be_verbose > 2)
1765 printf("%s: skipping dir: %s\n", path, strerror(errno));
985 return; 1766 return 1;
986 } 1767 }
987 if (be_verbose) printf("%s: scanning dir\n", path); 1768 if (be_verbose > 1) printf("%s: scanning dir\n", path);
988 1769
989 pathlen = strlen(path); 1770 subpath = stpcpy(buf, path);
1771 if (subpath[-1] != '/')
1772 *subpath++ = '/';
1773 pathlen = subpath - buf;
990 while ((dentry = readdir(dir))) { 1774 while ((dentry = readdir(dir))) {
991 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1775 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
992 continue; 1776 continue;
1777
1778 if (fstatat(subdir_fd, dentry->d_name, &st, AT_SYMLINK_NOFOLLOW) == -1)
1779 continue;
1780
993 len = (pathlen + 1 + strlen(dentry->d_name) + 1); 1781 len = strlen(dentry->d_name);
994 if (len >= sizeof(buf)) { 1782 if (len + pathlen + 1 >= sizeof(buf)) {
995 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path, 1783 warnf("Skipping '%s%s': len > sizeof(buf); %zu > %zu\n",
996 (unsigned long)len, (unsigned long)sizeof(buf)); 1784 path, dentry->d_name, len + pathlen + 1, sizeof(buf));
997 continue; 1785 continue;
998 } 1786 }
999 sprintf(buf, "%s/%s", path, dentry->d_name); 1787 memcpy(subpath, dentry->d_name, len);
1000 if (lstat(buf, &st) != -1) { 1788 subpath[len] = '\0';
1789
1001 if (S_ISREG(st.st_mode)) 1790 if (S_ISREG(st.st_mode))
1002 scanelf_file(buf); 1791 ret = scanelf_fileat(dir_fd, buf, &st);
1003 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1792 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1004 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1793 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1005 scanelf_dir(buf); 1794 ret = scanelf_dirat(dir_fd, buf);
1006 }
1007 } 1795 }
1008 } 1796 }
1009 closedir(dir); 1797 closedir(dir);
1010}
1011 1798
1799 return ret;
1800}
1801static int scanelf_dir(const char *path)
1802{
1803 return scanelf_dirat(root_fd, root_rel_path(path));
1804}
1805
1012static int scanelf_from_file(char *filename) 1806static int scanelf_from_file(const char *filename)
1013{ 1807{
1014 FILE *fp = NULL; 1808 FILE *fp;
1015 char *p; 1809 char *p, *path;
1016 char path[_POSIX_PATH_MAX]; 1810 size_t len;
1811 int ret;
1017 1812
1018 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL)) 1813 if (strcmp(filename, "-") == 0)
1019 fp = stdin; 1814 fp = stdin;
1020 else if ((fp = fopen(filename, "r")) == NULL) 1815 else if ((fp = fopen(filename, "r")) == NULL)
1021 return 1; 1816 return 1;
1022 1817
1023 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1818 path = NULL;
1819 len = 0;
1820 ret = 0;
1821 while (getline(&path, &len, fp) != -1) {
1024 if ((p = strchr(path, '\n')) != NULL) 1822 if ((p = strchr(path, '\n')) != NULL)
1025 *p = 0; 1823 *p = 0;
1026 search_path = path; 1824 search_path = path;
1027 scanelf_dir(path); 1825 ret = scanelf_dir(path);
1028 } 1826 }
1827 free(path);
1828
1029 if (fp != stdin) 1829 if (fp != stdin)
1030 fclose(fp); 1830 fclose(fp);
1831
1031 return 0; 1832 return ret;
1032} 1833}
1033 1834
1034static void load_ld_so_conf() 1835#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1836
1837static int _load_ld_cache_config(const char *fname)
1035{ 1838{
1036 FILE *fp = NULL; 1839 FILE *fp = NULL;
1037 char *p; 1840 char *p, *path;
1038 char path[_POSIX_PATH_MAX]; 1841 size_t len;
1039 int i = 0; 1842 int curr_fd = -1;
1040 1843
1041 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1844 fp = fopenat_r(root_fd, root_rel_path(fname));
1845 if (fp == NULL)
1042 return; 1846 return -1;
1043 1847
1044 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1848 path = NULL;
1045 if (*path != '/') 1849 len = 0;
1046 continue; 1850 while (getline(&path, &len, fp) != -1) {
1047
1048 if ((p = strrchr(path, '\r')) != NULL) 1851 if ((p = strrchr(path, '\r')) != NULL)
1049 *p = 0; 1852 *p = 0;
1050 if ((p = strchr(path, '\n')) != NULL) 1853 if ((p = strchr(path, '\n')) != NULL)
1051 *p = 0; 1854 *p = 0;
1052 1855
1053 ldpaths[i++] = xstrdup(path); 1856 /* recursive includes of the same file will make this segfault. */
1857 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1858 glob_t gl;
1859 size_t x;
1860 const char *gpath;
1054 1861
1055 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths)) 1862 /* re-use existing path buffer ... need to be creative */
1056 break; 1863 if (path[8] != '/')
1864 gpath = memcpy(path + 3, "/etc/", 5);
1865 else
1866 gpath = path + 8;
1867 if (root_fd != AT_FDCWD) {
1868 if (curr_fd == -1) {
1869 curr_fd = open(".", O_RDONLY|O_CLOEXEC);
1870 if (fchdir(root_fd))
1871 errp("unable to change to root dir");
1872 }
1873 gpath = root_rel_path(gpath);
1874 }
1875
1876 if (glob(gpath, 0, NULL, &gl) == 0) {
1877 for (x = 0; x < gl.gl_pathc; ++x) {
1878 /* try to avoid direct loops */
1879 if (strcmp(gl.gl_pathv[x], fname) == 0)
1880 continue;
1881 _load_ld_cache_config(gl.gl_pathv[x]);
1882 }
1883 globfree(&gl);
1884 }
1885
1886 /* failed globs are ignored by glibc */
1887 continue;
1057 } 1888 }
1058 ldpaths[i] = NULL; 1889
1890 if (*path != '/')
1891 continue;
1892
1893 xarraypush_str(ldpaths, path);
1894 }
1895 free(path);
1059 1896
1060 fclose(fp); 1897 fclose(fp);
1898
1899 if (curr_fd != -1) {
1900 if (fchdir(curr_fd))
1901 {/* don't care */}
1902 close(curr_fd);
1903 }
1904
1905 return 0;
1906}
1907
1908#elif defined(__FreeBSD__) || defined(__DragonFly__)
1909
1910static int _load_ld_cache_config(const char *fname)
1911{
1912 FILE *fp = NULL;
1913 char *b = NULL, *p;
1914 struct elfhints_hdr hdr;
1915
1916 fp = fopenat_r(root_fd, root_rel_path(fname));
1917 if (fp == NULL)
1918 return -1;
1919
1920 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1921 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1922 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1923 {
1924 fclose(fp);
1925 return -1;
1926 }
1927
1928 b = xmalloc(hdr.dirlistlen + 1);
1929 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1930 fclose(fp);
1931 free(b);
1932 return -1;
1933 }
1934
1935 while ((p = strsep(&b, ":"))) {
1936 if (*p == '\0')
1937 continue;
1938 xarraypush_str(ldpaths, p);
1939 }
1940
1941 free(b);
1942 fclose(fp);
1943 return 0;
1944}
1945
1946#else
1947#ifdef __ELF__
1948#warning Cache config support not implemented for your target
1949#endif
1950static int _load_ld_cache_config(const char *fname)
1951{
1952 return 0;
1953}
1954#endif
1955
1956static void load_ld_cache_config(const char *fname)
1957{
1958 bool scan_l, scan_ul, scan_ull;
1959 size_t n;
1960 const char *ldpath;
1961
1962 _load_ld_cache_config(fname);
1963
1964 scan_l = scan_ul = scan_ull = false;
1965 array_for_each(ldpaths, n, ldpath) {
1966 if (!scan_l && !strcmp(ldpath, "/lib")) scan_l = true;
1967 if (!scan_ul && !strcmp(ldpath, "/usr/lib")) scan_ul = true;
1968 if (!scan_ull && !strcmp(ldpath, "/usr/local/lib")) scan_ull = true;
1969 }
1970
1971 if (!scan_l) xarraypush_str(ldpaths, "/lib");
1972 if (!scan_ul) xarraypush_str(ldpaths, "/usr/lib");
1973 if (!scan_ull) xarraypush_str(ldpaths, "/usr/local/lib");
1061} 1974}
1062 1975
1063/* scan /etc/ld.so.conf for paths */ 1976/* scan /etc/ld.so.conf for paths */
1064static void scanelf_ldpath() 1977static void scanelf_ldpath(void)
1065{ 1978{
1066 char scan_l, scan_ul, scan_ull; 1979 size_t n;
1067 int i = 0; 1980 const char *ldpath;
1068 1981
1069 if (!ldpaths[0]) 1982 array_for_each(ldpaths, n, ldpath)
1070 err("Unable to load any paths from ld.so.conf");
1071
1072 scan_l = scan_ul = scan_ull = 0;
1073
1074 while (ldpaths[i]) {
1075 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
1076 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
1077 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
1078 scanelf_dir(ldpaths[i]); 1983 scanelf_dir(ldpath);
1079 ++i;
1080 }
1081
1082 if (!scan_l) scanelf_dir("/lib");
1083 if (!scan_ul) scanelf_dir("/usr/lib");
1084 if (!scan_ull) scanelf_dir("/usr/local/lib");
1085} 1984}
1086 1985
1087/* scan env PATH for paths */ 1986/* scan env PATH for paths */
1088static void scanelf_envpath() 1987static void scanelf_envpath(void)
1089{ 1988{
1090 char *path, *p; 1989 char *path, *p;
1091 1990
1092 path = getenv("PATH"); 1991 path = getenv("PATH");
1093 if (!path) 1992 if (!path)
1100 } 1999 }
1101 2000
1102 free(path); 2001 free(path);
1103} 2002}
1104 2003
1105 2004/* usage / invocation handling functions */ /* Free Flags: c d j u w G H J K P Q U W */
1106/* usage / invocation handling functions */
1107#define PARSE_FLAGS "plRmyxetrnLibSs:gN:TaqvF:f:o:BhV" 2005#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZCBhV"
1108#define a_argument required_argument 2006#define a_argument required_argument
1109static struct option const long_opts[] = { 2007static struct option const long_opts[] = {
1110 {"path", no_argument, NULL, 'p'}, 2008 {"path", no_argument, NULL, 'p'},
1111 {"ldpath", no_argument, NULL, 'l'}, 2009 {"ldpath", no_argument, NULL, 'l'},
2010 {"use-ldpath",no_argument, NULL, 129},
2011 {"root", a_argument, NULL, 128},
1112 {"recursive", no_argument, NULL, 'R'}, 2012 {"recursive", no_argument, NULL, 'R'},
1113 {"mount", no_argument, NULL, 'm'}, 2013 {"mount", no_argument, NULL, 'm'},
1114 {"symlink", no_argument, NULL, 'y'}, 2014 {"symlink", no_argument, NULL, 'y'},
2015 {"archives", no_argument, NULL, 'A'},
2016 {"ldcache", no_argument, NULL, 'L'},
2017 {"fix", no_argument, NULL, 'X'},
2018 {"setpax", a_argument, NULL, 'z'},
1115 {"pax", no_argument, NULL, 'x'}, 2019 {"pax", no_argument, NULL, 'x'},
1116 {"header", no_argument, NULL, 'e'}, 2020 {"header", no_argument, NULL, 'e'},
1117 {"textrel", no_argument, NULL, 't'}, 2021 {"textrel", no_argument, NULL, 't'},
1118 {"rpath", no_argument, NULL, 'r'}, 2022 {"rpath", no_argument, NULL, 'r'},
1119 {"needed", no_argument, NULL, 'n'}, 2023 {"needed", no_argument, NULL, 'n'},
1120 {"ldcache", no_argument, NULL, 'L'},
1121 {"interp", no_argument, NULL, 'i'}, 2024 {"interp", no_argument, NULL, 'i'},
1122 {"bind", no_argument, NULL, 'b'}, 2025 {"bind", no_argument, NULL, 'b'},
1123 {"soname", no_argument, NULL, 'S'}, 2026 {"soname", no_argument, NULL, 'S'},
1124 {"symbol", a_argument, NULL, 's'}, 2027 {"symbol", a_argument, NULL, 's'},
2028 {"section", a_argument, NULL, 'k'},
1125 {"lib", a_argument, NULL, 'N'}, 2029 {"lib", a_argument, NULL, 'N'},
1126 {"gmatch", no_argument, NULL, 'g'}, 2030 {"gmatch", no_argument, NULL, 'g'},
1127 {"textrels", no_argument, NULL, 'T'}, 2031 {"textrels", no_argument, NULL, 'T'},
2032 {"etype", a_argument, NULL, 'E'},
2033 {"bits", a_argument, NULL, 'M'},
2034 {"endian", no_argument, NULL, 'D'},
2035 {"osabi", no_argument, NULL, 'I'},
2036 {"eabi", no_argument, NULL, 'Y'},
2037 {"perms", a_argument, NULL, 'O'},
2038 {"size", no_argument, NULL, 'Z'},
1128 {"all", no_argument, NULL, 'a'}, 2039 {"all", no_argument, NULL, 'a'},
1129 {"quiet", no_argument, NULL, 'q'}, 2040 {"quiet", no_argument, NULL, 'q'},
1130 {"verbose", no_argument, NULL, 'v'}, 2041 {"verbose", no_argument, NULL, 'v'},
1131 {"format", a_argument, NULL, 'F'}, 2042 {"format", a_argument, NULL, 'F'},
1132 {"from", a_argument, NULL, 'f'}, 2043 {"from", a_argument, NULL, 'f'},
1133 {"file", a_argument, NULL, 'o'}, 2044 {"file", a_argument, NULL, 'o'},
2045 {"nocolor", no_argument, NULL, 'C'},
1134 {"nobanner", no_argument, NULL, 'B'}, 2046 {"nobanner", no_argument, NULL, 'B'},
1135 {"help", no_argument, NULL, 'h'}, 2047 {"help", no_argument, NULL, 'h'},
1136 {"version", no_argument, NULL, 'V'}, 2048 {"version", no_argument, NULL, 'V'},
1137 {NULL, no_argument, NULL, 0x0} 2049 {NULL, no_argument, NULL, 0x0}
1138}; 2050};
1139 2051
1140static const char *opts_help[] = { 2052static const char * const opts_help[] = {
1141 "Scan all directories in PATH environment", 2053 "Scan all directories in PATH environment",
1142 "Scan all directories in /etc/ld.so.conf", 2054 "Scan all directories in /etc/ld.so.conf",
2055 "Use ld.so.conf to show full path (use with -r/-n)",
2056 "Root directory (use with -l or -p)",
1143 "Scan directories recursively", 2057 "Scan directories recursively",
1144 "Don't recursively cross mount points", 2058 "Don't recursively cross mount points",
1145 "Don't scan symlinks\n", 2059 "Don't scan symlinks",
2060 "Scan archives (.a files)",
2061 "Utilize ld.so.cache to show full path (use with -r/-n)",
2062 "Try and 'fix' bad things (use with -r/-e)",
2063 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1146 "Print PaX markings", 2064 "Print PaX markings",
1147 "Print GNU_STACK/PT_LOAD markings", 2065 "Print GNU_STACK/PT_LOAD markings",
1148 "Print TEXTREL information", 2066 "Print TEXTREL information",
1149 "Print RPATH information", 2067 "Print RPATH information",
1150 "Print NEEDED information", 2068 "Print NEEDED information",
1151 "Resolve NEEDED information (use with -n)",
1152 "Print INTERP information", 2069 "Print INTERP information",
1153 "Print BIND information", 2070 "Print BIND information",
1154 "Print SONAME information", 2071 "Print SONAME information",
1155 "Find a specified symbol", 2072 "Find a specified symbol",
2073 "Find a specified section",
1156 "Find a specified library", 2074 "Find a specified library",
1157 "Use strncmp to match libraries. (use with -N)", 2075 "Use regex rather than string compare (with -s); specify twice for case insensitive",
1158 "Locate cause of TEXTREL", 2076 "Locate cause of TEXTREL",
1159 "Print all scanned info (-x -e -t -r -b)\n", 2077 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
2078 "Print only ELF files matching numeric bits",
2079 "Print Endianness",
2080 "Print OSABI",
2081 "Print EABI (EM_ARM Only)",
2082 "Print only ELF files matching octal permissions",
2083 "Print ELF file size",
2084 "Print all useful/simple info\n",
1160 "Only output 'bad' things", 2085 "Only output 'bad' things",
1161 "Be verbose (can be specified more than once)", 2086 "Be verbose (can be specified more than once)",
1162 "Use specified format for output", 2087 "Use specified format for output",
1163 "Read input stream from a filename", 2088 "Read input stream from a filename",
1164 "Write output stream to a filename", 2089 "Write output stream to a filename",
2090 "Don't emit color in output",
1165 "Don't display the header", 2091 "Don't display the header",
1166 "Print this help and exit", 2092 "Print this help and exit",
1167 "Print version and exit", 2093 "Print version and exit",
1168 NULL 2094 NULL
1169}; 2095};
1170 2096
1171/* display usage and exit */ 2097/* display usage and exit */
1172static void usage(int status) 2098static void usage(int status)
1173{ 2099{
1174 unsigned long i; 2100 const char a_arg[] = "<arg>";
2101 size_t a_arg_len = strlen(a_arg) + 2;
2102 size_t i;
2103 int optlen;
1175 printf("* Scan ELF binaries for stuff\n\n" 2104 printf("* Scan ELF binaries for stuff\n\n"
1176 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0); 2105 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1177 printf("Options: -[%s]\n", PARSE_FLAGS); 2106 printf("Options: -[%s]\n", PARSE_FLAGS);
2107
2108 /* prescan the --long opt length to auto-align */
2109 optlen = 0;
1178 for (i = 0; long_opts[i].name; ++i) 2110 for (i = 0; long_opts[i].name; ++i) {
2111 int l = strlen(long_opts[i].name);
2112 if (long_opts[i].has_arg == a_argument)
2113 l += a_arg_len;
2114 optlen = max(l, optlen);
2115 }
2116
2117 for (i = 0; long_opts[i].name; ++i) {
2118 /* first output the short flag if it has one */
2119 if (long_opts[i].val > '~')
2120 printf(" ");
2121 else
2122 printf(" -%c, ", long_opts[i].val);
2123
2124 /* then the long flag */
1179 if (long_opts[i].has_arg == no_argument) 2125 if (long_opts[i].has_arg == no_argument)
1180 printf(" -%c, --%-13s* %s\n", long_opts[i].val, 2126 printf("--%-*s", optlen, long_opts[i].name);
1181 long_opts[i].name, opts_help[i]);
1182 else 2127 else
1183 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val, 2128 printf("--%s %s %*s", long_opts[i].name, a_arg,
1184 long_opts[i].name, opts_help[i]); 2129 (int)(optlen - strlen(long_opts[i].name) - a_arg_len), "");
1185 2130
1186 if (status != EXIT_SUCCESS) 2131 /* finally the help text */
1187 exit(status); 2132 printf("* %s\n", opts_help[i]);
2133 }
1188 2134
1189 puts("\nThe format modifiers for the -F option are:"); 2135 puts("\nFor more information, see the scanelf(1) manpage");
1190 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1191 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1192 puts(" i INTERP \tb BIND \ts symbol");
1193 puts(" N library \to Type \tT TEXTRELs");
1194 puts(" S SONAME");
1195 puts(" p filename (with search path removed)");
1196 puts(" f filename (short name/basename)");
1197 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1198
1199 exit(status); 2136 exit(status);
1200} 2137}
1201 2138
1202/* parse command line arguments and preform needed actions */ 2139/* parse command line arguments and preform needed actions */
2140#define do_pax_state(option, flag) \
2141 if (islower(option)) { \
2142 flags &= ~PF_##flag; \
2143 flags |= PF_NO##flag; \
2144 } else { \
2145 flags &= ~PF_NO##flag; \
2146 flags |= PF_##flag; \
2147 }
2148static void parse_delimited(array_t *arr, char *arg, const char *delim)
2149{
2150 char *ele = strtok(arg, delim);
2151 if (!ele) /* edge case: -s '' */
2152 xarraypush_str(arr, "");
2153 while (ele) {
2154 xarraypush_str(arr, ele);
2155 ele = strtok(NULL, delim);
2156 }
2157}
1203static void parseargs(int argc, char *argv[]) 2158static int parseargs(int argc, char *argv[])
1204{ 2159{
1205 int i; 2160 int i;
1206 char *from_file = NULL; 2161 const char *from_file = NULL;
2162 int ret = 0;
2163 char load_cache_config = 0;
1207 2164
1208 opterr = 0; 2165 opterr = 0;
1209 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 2166 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1210 switch (i) { 2167 switch (i) {
1211 2168
1215 VERSION, __FILE__, __DATE__, rcsid, argv0); 2172 VERSION, __FILE__, __DATE__, rcsid, argv0);
1216 exit(EXIT_SUCCESS); 2173 exit(EXIT_SUCCESS);
1217 break; 2174 break;
1218 case 'h': usage(EXIT_SUCCESS); break; 2175 case 'h': usage(EXIT_SUCCESS); break;
1219 case 'f': 2176 case 'f':
1220 if (from_file) err("Don't specify -f twice"); 2177 if (from_file) warn("You prob don't want to specify -f twice");
1221 from_file = xstrdup(optarg); 2178 from_file = optarg;
2179 break;
2180 case 'E':
2181 /* historically, this was comma delimited */
2182 parse_delimited(match_etypes, optarg, ",");
2183 break;
2184 case 'M':
2185 match_bits = atoi(optarg);
2186 if (match_bits == 0) {
2187 if (strcmp(optarg, "ELFCLASS32") == 0)
2188 match_bits = 32;
2189 if (strcmp(optarg, "ELFCLASS64") == 0)
2190 match_bits = 64;
2191 }
2192 break;
2193 case 'O':
2194 if (sscanf(optarg, "%o", &match_perms) == -1)
2195 match_bits = 0;
1222 break; 2196 break;
1223 case 'o': { 2197 case 'o': {
1224 FILE *fp = NULL;
1225 if ((fp = freopen(optarg, "w", stdout)) == NULL) 2198 if (freopen(optarg, "w", stdout) == NULL)
1226 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 2199 errp("Could not freopen(%s)", optarg);
1227 SET_STDOUT(fp);
1228 break; 2200 break;
1229 } 2201 }
1230
1231 case 's': { 2202 case 'k':
1232 if (find_sym) warn("You prob don't want to specify -s twice"); 2203 xarraypush_str(find_section_arr, optarg);
1233 find_sym = optarg;
1234 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1235 sprintf(versioned_symname, "%s@", find_sym);
1236 break; 2204 break;
1237 }
1238 case 'N': { 2205 case 's':
1239 if (find_lib) warn("You prob don't want to specify -N twice"); 2206 /* historically, this was comma delimited */
1240 find_lib = optarg; 2207 parse_delimited(find_sym_arr, optarg, ",");
1241 break; 2208 break;
1242 } 2209 case 'N':
1243 2210 xarraypush_str(find_lib_arr, optarg);
2211 break;
1244 case 'F': { 2212 case 'F': {
1245 if (out_format) warn("You prob don't want to specify -F twice"); 2213 if (out_format) warn("You prob don't want to specify -F twice");
1246 out_format = optarg; 2214 out_format = optarg;
1247 break; 2215 break;
1248 } 2216 }
2217 case 'z': {
2218 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
2219 size_t x;
1249 2220
1250 case 'g': gmatch = 1; /* break; any reason we dont breal; here ? */ 2221 for (x = 0; x < strlen(optarg); x++) {
1251 case 'L': printcache = 1; break; 2222 switch (optarg[x]) {
2223 case 'p':
2224 case 'P':
2225 do_pax_state(optarg[x], PAGEEXEC);
2226 break;
2227 case 's':
2228 case 'S':
2229 do_pax_state(optarg[x], SEGMEXEC);
2230 break;
2231 case 'm':
2232 case 'M':
2233 do_pax_state(optarg[x], MPROTECT);
2234 break;
2235 case 'e':
2236 case 'E':
2237 do_pax_state(optarg[x], EMUTRAMP);
2238 break;
2239 case 'r':
2240 case 'R':
2241 do_pax_state(optarg[x], RANDMMAP);
2242 break;
2243 case 'x':
2244 case 'X':
2245 do_pax_state(optarg[x], RANDEXEC);
2246 break;
2247 default:
2248 break;
2249 }
2250 }
2251 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
2252 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
2253 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
2254 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
2255 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
2256 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
2257 setpax = flags;
2258 break;
2259 }
2260 case 'Z': show_size = 1; break;
2261 case 'g': ++g_match; break;
2262 case 'L': load_cache_config = use_ldcache = 1; break;
1252 case 'y': scan_symlink = 0; break; 2263 case 'y': scan_symlink = 0; break;
2264 case 'A': scan_archives = 1; break;
2265 case 'C': color_init(true); break;
1253 case 'B': show_banner = 0; break; 2266 case 'B': show_banner = 0; break;
1254 case 'l': scan_ldpath = 1; break; 2267 case 'l': load_cache_config = scan_ldpath = 1; break;
1255 case 'p': scan_envpath = 1; break; 2268 case 'p': scan_envpath = 1; break;
1256 case 'R': dir_recurse = 1; break; 2269 case 'R': dir_recurse = 1; break;
1257 case 'm': dir_crossmount = 0; break; 2270 case 'm': dir_crossmount = 0; break;
2271 case 'X': ++fix_elf; break;
1258 case 'x': show_pax = 1; break; 2272 case 'x': show_pax = 1; break;
1259 case 'e': show_phdr = 1; break; 2273 case 'e': show_phdr = 1; break;
1260 case 't': show_textrel = 1; break; 2274 case 't': show_textrel = 1; break;
1261 case 'r': show_rpath = 1; break; 2275 case 'r': show_rpath = 1; break;
1262 case 'n': show_needed = 1; break; 2276 case 'n': show_needed = 1; break;
1263 case 'i': show_interp = 1; break; 2277 case 'i': show_interp = 1; break;
1264 case 'b': show_bind = 1; break; 2278 case 'b': show_bind = 1; break;
1265 case 'S': show_soname = 1; break; 2279 case 'S': show_soname = 1; break;
1266 case 'T': show_textrels = 1; break; 2280 case 'T': show_textrels = 1; break;
1267 case 'q': be_quiet = 1; break; 2281 case 'q': be_quiet = min(be_quiet, 20) + 1; break;
1268 case 'v': be_verbose = (be_verbose % 20) + 1; break; 2282 case 'v': be_verbose = min(be_verbose, 20) + 1; break;
1269 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break; 2283 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
1270 2284 case 'D': show_endian = 1; break;
2285 case 'I': show_osabi = 1; break;
2286 case 'Y': show_eabi = 1; break;
2287 case 128:
2288 root_fd = open(optarg, O_RDONLY|O_CLOEXEC);
2289 if (root_fd == -1)
2290 err("Could not open root: %s", optarg);
2291 break;
2292 case 129: load_cache_config = use_ldpath = 1; break;
1271 case ':': 2293 case ':':
1272 err("Option missing parameter\n"); 2294 err("Option '%c' is missing parameter", optopt);
1273 case '?': 2295 case '?':
1274 err("Unknown option\n"); 2296 err("Unknown option '%c' or argument missing", optopt);
1275 default: 2297 default:
1276 err("Unhandled option '%c'", i); 2298 err("Unhandled option '%c'; please report this", i);
1277 } 2299 }
1278 } 2300 }
2301 if (show_textrels && be_verbose)
2302 objdump = which("objdump", "OBJDUMP");
2303 /* precompile all the regexes */
2304 if (g_match) {
2305 regex_t preg;
2306 const char *this_sym;
2307 size_t n;
2308 int flags = REG_EXTENDED | REG_NOSUB | (g_match > 1 ? REG_ICASE : 0);
1279 2309
2310 array_for_each(find_sym_arr, n, this_sym) {
2311 /* see scanelf_match_symname for logic info */
2312 switch (this_sym[0]) {
2313 case '%':
2314 while (*(this_sym++))
2315 if (*this_sym == '%') {
2316 ++this_sym;
2317 break;
2318 }
2319 break;
2320 case '+':
2321 case '-':
2322 ++this_sym;
2323 break;
2324 }
2325 if (*this_sym == '*')
2326 ++this_sym;
2327
2328 ret = regcomp(&preg, this_sym, flags);
2329 if (ret) {
2330 char err[256];
2331 regerror(ret, &preg, err, sizeof(err));
2332 err("regcomp of %s failed: %s", this_sym, err);
2333 }
2334 xarraypush(find_sym_regex_arr, &preg, sizeof(preg));
2335 }
2336 }
2337 /* flatten arrays for display */
2338 find_sym = array_flatten_str(find_sym_arr);
2339 find_lib = array_flatten_str(find_lib_arr);
2340 find_section = array_flatten_str(find_section_arr);
1280 /* let the format option override all other options */ 2341 /* let the format option override all other options */
1281 if (out_format) { 2342 if (out_format) {
1282 show_pax = show_phdr = show_textrel = show_rpath = \ 2343 show_pax = show_phdr = show_textrel = show_rpath = \
1283 show_needed = show_interp = show_bind = show_soname = \ 2344 show_needed = show_interp = show_bind = show_soname = \
1284 show_textrels = 0; 2345 show_textrels = show_perms = show_endian = show_size = \
2346 show_osabi = show_eabi = 0;
1285 for (i = 0; out_format[i]; ++i) { 2347 for (i = 0; out_format[i]; ++i) {
1286 if (!IS_MODIFIER(out_format[i])) continue; 2348 if (!IS_MODIFIER(out_format[i])) continue;
1287 2349
1288 switch (out_format[++i]) { 2350 switch (out_format[++i]) {
2351 case '+': break;
1289 case '%': break; 2352 case '%': break;
1290 case '#': break; 2353 case '#': break;
1291 case 'F': break; 2354 case 'F': break;
1292 case 'p': break; 2355 case 'p': break;
1293 case 'f': break; 2356 case 'f': break;
2357 case 'k': break;
1294 case 's': break; 2358 case 's': break;
1295 case 'N': break; 2359 case 'N': break;
1296 case 'o': break; 2360 case 'o': break;
2361 case 'a': break;
2362 case 'M': break;
2363 case 'Z': show_size = 1; break;
2364 case 'D': show_endian = 1; break;
2365 case 'I': show_osabi = 1; break;
2366 case 'Y': show_eabi = 1; break;
2367 case 'O': show_perms = 1; break;
1297 case 'x': show_pax = 1; break; 2368 case 'x': show_pax = 1; break;
1298 case 'e': show_phdr = 1; break; 2369 case 'e': show_phdr = 1; break;
1299 case 't': show_textrel = 1; break; 2370 case 't': show_textrel = 1; break;
1300 case 'r': show_rpath = 1; break; 2371 case 'r': show_rpath = 1; break;
1301 case 'n': show_needed = 1; break; 2372 case 'n': show_needed = 1; break;
1302 case 'i': show_interp = 1; break; 2373 case 'i': show_interp = 1; break;
1303 case 'b': show_bind = 1; break; 2374 case 'b': show_bind = 1; break;
1304 case 'S': show_soname = 1; break; 2375 case 'S': show_soname = 1; break;
1305 case 'T': show_textrels = 1; break; 2376 case 'T': show_textrels = 1; break;
1306 default: 2377 default:
1307 err("Invalid format specifier '%c' (byte %i)", 2378 err("invalid format specifier '%c' (byte %i)",
1308 out_format[i], i+1); 2379 out_format[i], i+1);
1309 } 2380 }
1310 } 2381 }
1311 2382
1312 /* construct our default format */ 2383 /* construct our default format */
1313 } else { 2384 } else {
1314 size_t fmt_len = 30; 2385 size_t fmt_len = 30;
1315 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 2386 out_format = xmalloc(sizeof(char) * fmt_len);
2387 *out_format = '\0';
1316 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 2388 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1317 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len); 2389 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
2390 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
2391 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
2392 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
2393 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
2394 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
1318 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len); 2395 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1319 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 2396 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1320 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 2397 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1321 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 2398 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1322 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 2399 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1323 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len); 2400 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1324 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len); 2401 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1325 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len); 2402 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1326 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len); 2403 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
2404 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1327 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len); 2405 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1328 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 2406 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1329 } 2407 }
1330 if (be_verbose > 2) printf("Format: %s\n", out_format); 2408 if (be_verbose > 2) printf("Format: %s\n", out_format);
1331 2409
1332 /* now lets actually do the scanning */ 2410 /* now lets actually do the scanning */
1333 if (scan_ldpath || (show_rpath && be_quiet)) 2411 if (load_cache_config)
1334 load_ld_so_conf(); 2412 load_ld_cache_config(__PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
1335 if (scan_ldpath) scanelf_ldpath(); 2413 if (scan_ldpath) scanelf_ldpath();
1336 if (scan_envpath) scanelf_envpath(); 2414 if (scan_envpath) scanelf_envpath();
2415 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
2416 from_file = "-";
1337 if (from_file) { 2417 if (from_file) {
1338 scanelf_from_file(from_file); 2418 scanelf_from_file(from_file);
1339 free(from_file);
1340 from_file = *argv; 2419 from_file = *argv;
1341 } 2420 }
1342 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file) 2421 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1343 err("Nothing to scan !?"); 2422 err("Nothing to scan !?");
1344 while (optind < argc) { 2423 while (optind < argc) {
1345 search_path = argv[optind++]; 2424 search_path = argv[optind++];
1346 scanelf_dir(search_path); 2425 ret = scanelf_dir(search_path);
1347 } 2426 }
1348 2427
2428#ifdef __PAX_UTILS_CLEANUP
1349 /* clean up */ 2429 /* clean up */
1350 if (versioned_symname) free(versioned_symname);
1351 for (i = 0; ldpaths[i]; ++i)
1352 free(ldpaths[i]); 2430 xarrayfree(ldpaths);
2431 xarrayfree(find_sym_arr);
2432 xarrayfree(find_lib_arr);
2433 xarrayfree(find_section_arr);
2434 free(find_sym);
2435 free(find_lib);
2436 free(find_section);
2437 {
2438 size_t n;
2439 regex_t *preg;
2440 array_for_each(find_sym_regex_arr, n, preg)
2441 regfree(preg);
2442 xarrayfree(find_sym_regex_arr);
2443 }
1353 2444
1354 if (ldcache != 0) 2445 if (ldcache != 0)
1355 munmap(ldcache, ldcache_size); 2446 munmap(ldcache, ldcache_size);
1356} 2447#endif
1357 2448
1358
1359
1360/* utility funcs */
1361static char *xstrdup(const char *s)
1362{
1363 char *ret = strdup(s);
1364 if (!ret) err("Could not strdup(): %s", strerror(errno));
1365 return ret; 2449 return ret;
1366} 2450}
1367static void *xmalloc(size_t size)
1368{
1369 void *ret = malloc(size);
1370 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1371 return ret;
1372}
1373static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
1374{
1375 size_t new_len;
1376 2451
1377 new_len = strlen(*dst) + strlen(src); 2452static char **get_split_env(const char *envvar)
1378 if (*curr_len <= new_len) {
1379 *curr_len = new_len + (*curr_len / 2);
1380 *dst = realloc(*dst, *curr_len);
1381 if (!*dst)
1382 err("could not realloc() %li bytes", (unsigned long)*curr_len);
1383 }
1384
1385 if (n)
1386 strncat(*dst, src, n);
1387 else
1388 strcat(*dst, src);
1389}
1390static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1391{ 2453{
1392 static char my_app[2]; 2454 const char *delims = " \t\n";
1393 my_app[0] = append; 2455 char **envvals = NULL;
1394 my_app[1] = '\0'; 2456 char *env, *s;
1395 xstrcat(dst, my_app, curr_len); 2457 int nentry;
1396}
1397 2458
2459 if ((env = getenv(envvar)) == NULL)
2460 return NULL;
1398 2461
2462 env = xstrdup(env);
2463 if (env == NULL)
2464 return NULL;
2465
2466 s = strtok(env, delims);
2467 if (s == NULL) {
2468 free(env);
2469 return NULL;
2470 }
2471
2472 nentry = 0;
2473 while (s != NULL) {
2474 ++nentry;
2475 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
2476 envvals[nentry-1] = s;
2477 s = strtok(NULL, delims);
2478 }
2479 envvals[nentry] = NULL;
2480
2481 /* don't want to free(env) as it contains the memory that backs
2482 * the envvals array of strings */
2483 return envvals;
2484}
2485
2486static void parseenv(void)
2487{
2488 color_init(false);
2489 qa_textrels = get_split_env("QA_TEXTRELS");
2490 qa_execstack = get_split_env("QA_EXECSTACK");
2491 qa_wx_load = get_split_env("QA_WX_LOAD");
2492}
2493
2494#ifdef __PAX_UTILS_CLEANUP
2495static void cleanup(void)
2496{
2497 free(out_format);
2498 free(qa_textrels);
2499 free(qa_execstack);
2500 free(qa_wx_load);
2501}
2502#endif
1399 2503
1400int main(int argc, char *argv[]) 2504int main(int argc, char *argv[])
1401{ 2505{
2506 int ret;
1402 if (argc < 2) 2507 if (argc < 2)
1403 usage(EXIT_FAILURE); 2508 usage(EXIT_FAILURE);
2509 parseenv();
1404 parseargs(argc, argv); 2510 ret = parseargs(argc, argv);
1405 fclose(stdout); 2511 fclose(stdout);
1406#ifdef __BOUNDS_CHECKING_ON 2512#ifdef __PAX_UTILS_CLEANUP
1407 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()"); 2513 cleanup();
2514 warn("The calls to add/delete heap should be off:\n"
2515 "\t- 1 due to the out_buffer not being freed in scanelf_fileat()\n"
2516 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
1408#endif 2517#endif
1409 return EXIT_SUCCESS; 2518 return ret;
1410} 2519}
2520
2521/* Match filename against entries in matchlist, return TRUE
2522 * if the file is listed */
2523static int file_matches_list(const char *filename, char **matchlist)
2524{
2525 char **file;
2526 char *match;
2527 char buf[__PAX_UTILS_PATH_MAX];
2528
2529 if (matchlist == NULL)
2530 return 0;
2531
2532 for (file = matchlist; *file != NULL; file++) {
2533 if (search_path) {
2534 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2535 match = buf;
2536 } else {
2537 match = *file;
2538 }
2539 if (fnmatch(match, filename, 0) == 0)
2540 return 1;
2541 }
2542 return 0;
2543}

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