/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.98 Revision 1.265
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 1.265 2014/03/21 05:33:33 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 1.265 2014/03/21 05:33:33 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 */
67#define GET_SYMTABS(B) \ 182#define GET_SYMTABS(B) \
68 if (elf->elf_class == ELFCLASS ## B) { \ 183 if (elf->elf_class == ELFCLASS ## B) { \
69 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \ 184 Elf ## B ## _Shdr *esymtab = symtab; \
70 /* debug sections */ \ 185 Elf ## B ## _Shdr *estrtab = strtab; \
71 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \ 186 Elf ## B ## _Shdr *edynsym = dynsym; \
72 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \ 187 Elf ## B ## _Shdr *edynstr = dynstr; \
73 /* runtime sections */ \ 188 \
74 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \ 189 if (symtab && EGET(esymtab->sh_type) == SHT_NOBITS) \
75 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \ 190 symtab = NULL; \
191 if (dynsym && EGET(edynsym->sh_type) == SHT_NOBITS) \
192 dynsym = NULL; \
76 if (symtab && dynsym) { \ 193 if (symtab && dynsym) \
77 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \ 194 *sym = (EGET(esymtab->sh_size) > EGET(edynsym->sh_size)) ? symtab : dynsym; \
78 } else { \ 195 else \
79 *sym = (void*)(symtab ? symtab : dynsym); \ 196 *sym = symtab ? symtab : dynsym; \
80 } \ 197 \
198 if (strtab && EGET(estrtab->sh_type) == SHT_NOBITS) \
199 strtab = NULL; \
200 if (dynstr && EGET(edynstr->sh_type) == SHT_NOBITS) \
201 dynstr = NULL; \
81 if (strtab && dynstr) { \ 202 if (strtab && dynstr) \
82 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \ 203 *str = (EGET(estrtab->sh_size) > EGET(edynstr->sh_size)) ? strtab : dynstr; \
83 } else { \ 204 else \
84 *tab = (void*)(strtab ? strtab : dynstr); \ 205 *str = strtab ? strtab : dynstr; \
85 } \
86 } 206 }
87 GET_SYMTABS(32) 207 GET_SYMTABS(32)
88 GET_SYMTABS(64) 208 GET_SYMTABS(64)
209
210 if (*sym && *str)
211 return;
212
213 /*
214 * damn, they're really going to make us work for it huh?
215 * reconstruct the section header info out of the dynamic
216 * tags so we can see what symbols this guy uses at runtime.
217 */
218#define GET_SYMTABS_DT(B) \
219 if (elf->elf_class == ELFCLASS ## B) { \
220 size_t i; \
221 static Elf ## B ## _Shdr sym_shdr, str_shdr; \
222 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
223 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
224 Elf ## B ## _Addr vsym, vstr, vhash, vgnu_hash; \
225 Elf ## B ## _Dyn *dyn; \
226 Elf ## B ## _Off offset; \
227 \
228 /* lookup symbols used at runtime with DT_SYMTAB / DT_STRTAB */ \
229 vsym = vstr = vhash = vgnu_hash = 0; \
230 memset(&sym_shdr, 0, sizeof(sym_shdr)); \
231 memset(&str_shdr, 0, sizeof(str_shdr)); \
232 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
233 if (EGET(phdr[i].p_type) != PT_DYNAMIC) \
234 continue; \
235 \
236 offset = EGET(phdr[i].p_offset); \
237 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
238 continue; \
239 \
240 dyn = DYN ## B (elf->vdata + offset); \
241 while (EGET(dyn->d_tag) != DT_NULL) { \
242 switch (EGET(dyn->d_tag)) { \
243 case DT_SYMTAB: vsym = EGET(dyn->d_un.d_val); break; \
244 case DT_SYMENT: sym_shdr.sh_entsize = dyn->d_un.d_val; break; \
245 case DT_STRTAB: vstr = EGET(dyn->d_un.d_val); break; \
246 case DT_STRSZ: str_shdr.sh_size = dyn->d_un.d_val; break; \
247 case DT_HASH: vhash = EGET(dyn->d_un.d_val); break; \
248 /*case DT_GNU_HASH: vgnu_hash = EGET(dyn->d_un.d_val); break;*/ \
249 } \
250 ++dyn; \
251 } \
252 if (vsym && vstr) \
253 break; \
254 } \
255 if (!vsym || !vstr || !(vhash || vgnu_hash)) \
256 return; \
257 \
258 /* calc offset into the ELF by finding the load addr of the syms */ \
259 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
260 Elf ## B ## _Addr vaddr = EGET(phdr[i].p_vaddr); \
261 Elf ## B ## _Addr filesz = EGET(phdr[i].p_filesz); \
262 offset = EGET(phdr[i].p_offset); \
263 \
264 if (EGET(phdr[i].p_type) != PT_LOAD) \
265 continue; \
266 \
267 if (vhash >= vaddr && vhash < vaddr + filesz) { \
268 /* Scan the hash table to see how many entries we have */ \
269 Elf32_Word max_sym_idx = 0; \
270 Elf32_Word *hashtbl = elf->vdata + offset + (vhash - vaddr); \
271 Elf32_Word b, nbuckets = EGET(hashtbl[0]); \
272 Elf32_Word nchains = EGET(hashtbl[1]); \
273 Elf32_Word *buckets = &hashtbl[2]; \
274 Elf32_Word *chains = &buckets[nbuckets]; \
275 Elf32_Word sym_idx; \
276 \
277 for (b = 0; b < nbuckets; ++b) { \
278 if (!buckets[b]) \
279 continue; \
280 for (sym_idx = buckets[b]; sym_idx < nchains && sym_idx; sym_idx = chains[sym_idx]) \
281 if (max_sym_idx < sym_idx) \
282 max_sym_idx = sym_idx; \
283 } \
284 ESET(sym_shdr.sh_size, sym_shdr.sh_entsize * max_sym_idx); \
285 } \
286 \
287 if (vsym >= vaddr && vsym < vaddr + filesz) { \
288 ESET(sym_shdr.sh_offset, offset + (vsym - vaddr)); \
289 *sym = &sym_shdr; \
290 } \
291 \
292 if (vstr >= vaddr && vstr < vaddr + filesz) { \
293 ESET(str_shdr.sh_offset, offset + (vstr - vaddr)); \
294 *str = &str_shdr; \
295 } \
296 } \
297 }
298 GET_SYMTABS_DT(32)
299 GET_SYMTABS_DT(64)
89} 300}
301
90static char *scanelf_file_pax(elfobj *elf, char *found_pax) 302static char *scanelf_file_pax(elfobj *elf, char *found_pax)
91{ 303{
92 static char ret[7]; 304 static char ret[7];
93 unsigned long i, shown; 305 unsigned long i, shown;
94 306
103 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 315 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
104 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 316 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
105 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 317 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
106 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \ 318 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
107 continue; \ 319 continue; \
108 if (be_quiet && (EGET(phdr[i].p_flags) == 10240)) \ 320 if (fix_elf && setpax) { \
321 /* set the paxctl flags */ \
322 ESET(phdr[i].p_flags, setpax); \
323 } \
324 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
109 continue; \ 325 continue; \
110 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \ 326 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
111 *found_pax = 1; \ 327 *found_pax = 1; \
112 ++shown; \ 328 ++shown; \
113 break; \ 329 break; \
114 } \ 330 } \
115 } 331 }
116 SHOW_PAX(32) 332 SHOW_PAX(32)
117 SHOW_PAX(64) 333 SHOW_PAX(64)
118 } 334 }
335
336 /* Note: We do not support setting EI_PAX if not PT_PAX_FLAGS
337 * was found. This is known to break ELFs on glibc systems,
338 * and mainline PaX has deprecated use of this for a long time.
339 * We could support changing PT_GNU_STACK, but that doesn't
340 * seem like it's worth the effort. #411919
341 */
119 342
120 /* fall back to EI_PAX if no PT_PAX was found */ 343 /* fall back to EI_PAX if no PT_PAX was found */
121 if (!*ret) { 344 if (!*ret) {
122 static char *paxflags; 345 static char *paxflags;
123 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf)); 346 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
136 359
137static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load) 360static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
138{ 361{
139 static char ret[12]; 362 static char ret[12];
140 char *found; 363 char *found;
141 unsigned long i, shown;
142 unsigned char multi_stack, multi_relro, multi_load; 364 unsigned long i, shown, multi_stack, multi_relro, multi_load;
143 365
144 if (!show_phdr) return NULL; 366 if (!show_phdr) return NULL;
145 367
146 memcpy(ret, "--- --- ---\0", 12); 368 memcpy(ret, "--- --- ---\0", 12);
147 369
148 shown = 0; 370 shown = 0;
149 multi_stack = multi_relro = multi_load = 0; 371 multi_stack = multi_relro = multi_load = 0;
150 372
373#define NOTE_GNU_STACK ".note.GNU-stack"
151#define SHOW_PHDR(B) \ 374#define SHOW_PHDR(B) \
152 if (elf->elf_class == ELFCLASS ## B) { \ 375 if (elf->elf_class == ELFCLASS ## B) { \
153 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 376 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
154 Elf ## B ## _Off offset; \ 377 Elf ## B ## _Off offset; \
155 uint32_t flags, check_flags; \ 378 uint32_t flags, check_flags; \
156 if (elf->phdr != NULL) { \ 379 if (elf->phdr != NULL) { \
157 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 380 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
158 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \ 381 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
159 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \ 382 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
383 if (multi_stack++) \
160 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \ 384 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
385 if (file_matches_list(elf->filename, qa_execstack)) \
386 continue; \
161 found = found_phdr; \ 387 found = found_phdr; \
162 offset = 0; \ 388 offset = 0; \
163 check_flags = PF_X; \ 389 check_flags = PF_X; \
164 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \ 390 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
391 if (multi_relro++) \
165 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \ 392 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
166 found = found_relro; \ 393 found = found_relro; \
167 offset = 4; \ 394 offset = 4; \
168 check_flags = PF_X; \ 395 check_flags = PF_X; \
169 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \ 396 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
170 if (multi_load++ > 2) warnf("%s: more than 2 PT_LOAD's !?", elf->filename); \ 397 if (file_matches_list(elf->filename, qa_wx_load)) \
398 continue; \
171 found = found_load; \ 399 found = found_load; \
172 offset = 8; \ 400 offset = 8; \
173 check_flags = PF_W|PF_X; \ 401 check_flags = PF_W|PF_X; \
174 } else \ 402 } else \
175 continue; \ 403 continue; \
176 flags = EGET(phdr[i].p_flags); \ 404 flags = EGET(phdr[i].p_flags); \
177 if (be_quiet && ((flags & check_flags) != check_flags)) \ 405 if (be_quiet && ((flags & check_flags) != check_flags)) \
178 continue; \ 406 continue; \
407 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
408 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
409 ret[3] = ret[7] = '!'; \
410 flags = EGET(phdr[i].p_flags); \
411 } \
179 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \ 412 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
180 *found = 1; \ 413 *found = 1; \
181 ++shown; \ 414 ++shown; \
182 } \ 415 } \
183 } else if (elf->shdr != NULL) { \ 416 } else if (elf->shdr != NULL) { \
184 /* no program headers which means this is prob an object file */ \ 417 /* no program headers which means this is prob an object file */ \
185 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \ 418 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
186 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \ 419 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
420 char *str; \
421 if ((void*)strtbl > elf->data_end) \
422 goto skip_this_shdr##B; \
423 /* let's flag -w/+x object files since the final ELF will most likely \
424 * need write access to the stack (who doesn't !?). so the combined \
425 * output will bring in +w automatically and that's bad. \
426 */ \
187 check_flags = SHF_WRITE|SHF_EXECINSTR; \ 427 check_flags = /*SHF_WRITE|*/SHF_EXECINSTR; \
188 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \ 428 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
189 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \ 429 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
190 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \ 430 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
191 if (!strcmp((char*)(elf->data + offset), ".note.GNU-stack")) { \ 431 str = elf->data + offset; \
432 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
433 if (!strcmp(str, NOTE_GNU_STACK)) { \
192 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \ 434 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
193 flags = EGET(shdr[i].sh_flags); \ 435 flags = EGET(shdr[i].sh_flags); \
194 if (be_quiet && ((flags & check_flags) != check_flags)) \ 436 if (be_quiet && ((flags & check_flags) != check_flags)) \
195 continue; \ 437 continue; \
196 ++*found_phdr; \ 438 ++*found_phdr; \
200 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \ 442 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
201 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \ 443 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
202 break; \ 444 break; \
203 } \ 445 } \
204 } \ 446 } \
447 skip_this_shdr##B: \
205 if (!multi_stack) { \ 448 if (!multi_stack) { \
449 if (file_matches_list(elf->filename, qa_execstack)) \
450 return NULL; \
206 *found_phdr = 1; \ 451 *found_phdr = 1; \
207 shown = 1; \ 452 shown = 1; \
208 memcpy(ret, "!WX", 3); \ 453 memcpy(ret, "!WX", 3); \
209 } \ 454 } \
210 } \ 455 } \
215 if (be_wewy_wewy_quiet || (be_quiet && !shown)) 460 if (be_wewy_wewy_quiet || (be_quiet && !shown))
216 return NULL; 461 return NULL;
217 else 462 else
218 return ret; 463 return ret;
219} 464}
465
466/*
467 * See if this ELF contains a DT_TEXTREL tag in any of its
468 * PT_DYNAMIC sections.
469 */
220static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 470static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
221{ 471{
222 static const char *ret = "TEXTREL"; 472 static const char *ret = "TEXTREL";
223 unsigned long i; 473 unsigned long i;
224 474
225 if (!show_textrel && !show_textrels) return NULL; 475 if (!show_textrel && !show_textrels) return NULL;
476
477 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
226 478
227 if (elf->phdr) { 479 if (elf->phdr) {
228#define SHOW_TEXTREL(B) \ 480#define SHOW_TEXTREL(B) \
229 if (elf->elf_class == ELFCLASS ## B) { \ 481 if (elf->elf_class == ELFCLASS ## B) { \
230 Elf ## B ## _Dyn *dyn; \ 482 Elf ## B ## _Dyn *dyn; \
231 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 483 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
232 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 484 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
233 Elf ## B ## _Off offset; \ 485 Elf ## B ## _Off offset; \
234 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 486 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
235 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 487 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
236 offset = EGET(phdr[i].p_offset); \ 488 offset = EGET(phdr[i].p_offset); \
237 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 489 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
238 dyn = DYN ## B (elf->data + offset); \ 490 dyn = DYN ## B (elf->vdata + offset); \
239 while (EGET(dyn->d_tag) != DT_NULL) { \ 491 while (EGET(dyn->d_tag) != DT_NULL) { \
240 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \ 492 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
241 *found_textrel = 1; \ 493 *found_textrel = 1; \
242 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \ 494 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
243 return (be_wewy_wewy_quiet ? NULL : ret); \ 495 return (be_wewy_wewy_quiet ? NULL : ret); \
252 if (be_quiet || be_wewy_wewy_quiet) 504 if (be_quiet || be_wewy_wewy_quiet)
253 return NULL; 505 return NULL;
254 else 506 else
255 return " - "; 507 return " - ";
256} 508}
509
510/*
511 * Scan the .text section to see if there are any relocations in it.
512 * Should rewrite this to check PT_LOAD sections that are marked
513 * Executable rather than the section named '.text'.
514 */
257static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel) 515static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
258{ 516{
259 unsigned long s, r, rmax; 517 unsigned long s, r, rmax;
260 void *symtab_void, *strtab_void, *text_void; 518 void *symtab_void, *strtab_void, *text_void;
261 519
282 Elf ## B ## _Rela *rela; \ 540 Elf ## B ## _Rela *rela; \
283 /* search the section headers for relocations */ \ 541 /* search the section headers for relocations */ \
284 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \ 542 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
285 uint32_t sh_type = EGET(shdr[s].sh_type); \ 543 uint32_t sh_type = EGET(shdr[s].sh_type); \
286 if (sh_type == SHT_REL) { \ 544 if (sh_type == SHT_REL) { \
287 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \ 545 rel = REL ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
288 rela = NULL; \ 546 rela = NULL; \
289 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \ 547 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
290 } else if (sh_type == SHT_RELA) { \ 548 } else if (sh_type == SHT_RELA) { \
291 rel = NULL; \ 549 rel = NULL; \
292 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \ 550 rela = RELA ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
293 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \ 551 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
294 } else \ 552 } else \
295 continue; \ 553 continue; \
296 /* now see if any of the relocs are in the .text */ \ 554 /* now see if any of the relocs are in the .text */ \
297 for (r = 0; r < rmax; ++r) { \ 555 for (r = 0; r < rmax; ++r) { \
312 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \ 570 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
313 if (be_verbose <= 2) continue; \ 571 if (be_verbose <= 2) continue; \
314 } else \ 572 } else \
315 *found_textrels = 1; \ 573 *found_textrels = 1; \
316 /* locate this relocation symbol name */ \ 574 /* locate this relocation symbol name */ \
317 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 575 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
576 if ((void*)sym > elf->data_end) { \
577 warn("%s: corrupt ELF symbol", elf->filename); \
578 continue; \
579 } \
318 sym_max = ELF ## B ## _R_SYM(r_info); \ 580 sym_max = ELF ## B ## _R_SYM(r_info); \
319 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \ 581 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
320 sym += sym_max; \ 582 sym += sym_max; \
321 else \ 583 else \
322 sym = NULL; \ 584 sym = NULL; \
323 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 585 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
324 /* show the raw details about this reloc */ \ 586 /* show the raw details about this reloc */ \
325 printf(" %s: ", elf->base_filename); \ 587 printf(" %s: ", elf->base_filename); \
326 if (sym && sym->st_name) \ 588 if (sym && sym->st_name) \
327 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \ 589 printf("%s", elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
328 else \ 590 else \
329 printf("(memory/fake?)"); \ 591 printf("(memory/data?)"); \
330 printf(" [0x%lX]", (unsigned long)r_offset); \ 592 printf(" [0x%lX]", (unsigned long)r_offset); \
331 /* now try to find the closest symbol that this rel is probably in */ \ 593 /* now try to find the closest symbol that this rel is probably in */ \
332 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 594 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
333 func = NULL; \ 595 func = NULL; \
334 offset_tmp = 0; \ 596 offset_tmp = 0; \
335 while (sym_max--) { \ 597 while (sym_max--) { \
336 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \ 598 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
337 func = sym; \ 599 func = sym; \
338 offset_tmp = EGET(sym->st_value); \ 600 offset_tmp = EGET(sym->st_value); \
339 } \ 601 } \
340 ++sym; \ 602 ++sym; \
341 } \ 603 } \
342 printf(" in "); \ 604 printf(" in "); \
343 if (func && func->st_name) \ 605 if (func && func->st_name) { \
344 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \ 606 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
607 if (r_offset > EGET(func->st_size)) \
608 printf("(optimized out: previous %s)", func_name); \
345 else \ 609 else \
346 printf("(NULL: fake?)"); \ 610 printf("%s", func_name); \
611 } else \
612 printf("(optimized out)"); \
347 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \ 613 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
614 if (be_verbose && objdump) { \
615 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
616 char *sysbuf; \
617 size_t syslen; \
618 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"; \
619 syslen = sizeof(sysfmt) + strlen(objdump) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
620 sysbuf = xmalloc(syslen); \
621 if (end_addr < r_offset) \
622 /* not uncommon when things are optimized out */ \
623 end_addr = r_offset + 0x100; \
624 snprintf(sysbuf, syslen, sysfmt, \
625 objdump, \
626 (unsigned long)offset_tmp, \
627 (unsigned long)end_addr, \
628 elf->filename, \
629 (unsigned long)r_offset); \
630 fflush(stdout); \
631 if (system(sysbuf)) {/* don't care */} \
632 fflush(stdout); \
633 free(sysbuf); \
634 } \
348 } \ 635 } \
349 } } 636 } }
350 SHOW_TEXTRELS(32) 637 SHOW_TEXTRELS(32)
351 SHOW_TEXTRELS(64) 638 SHOW_TEXTRELS(64)
352 } 639 }
354 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename); 641 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
355 642
356 return NULL; 643 return NULL;
357} 644}
358 645
359static void rpath_security_checks(elfobj *, char *);
360static void rpath_security_checks(elfobj *elf, char *item) { 646static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
647{
361 struct stat st; 648 struct stat st;
362 switch (*item) { 649 switch (*item) {
363 case '/': break; 650 case '/': break;
364 case '.': 651 case '.':
365 warnf("Security problem with relative RPATH '%s' in %s", item, elf->filename); 652 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
366 break; 653 break;
654 case ':':
367 case '\0': 655 case '\0':
368 warnf("Security problem NULL RPATH in %s", elf->filename); 656 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
369 break; 657 break;
370 case '$': 658 case '$':
371 if (fstat(elf->fd, &st) != -1) 659 if (fstat(elf->fd, &st) != -1)
372 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID)) 660 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", 661 warnf("Security problem with %s='%s' in %s with mode set of %o",
374 item, elf->filename, st.st_mode & 07777); 662 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
375 break; 663 break;
376 default: 664 default:
377 warnf("Maybe? sec problem with RPATH='%s' in %s", item, elf->filename); 665 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
378 break; 666 break;
379 } 667 }
380} 668}
381static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len) 669static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
382{ 670{
383 unsigned long i, s; 671 unsigned long i;
384 char *rpath, *runpath, **r; 672 char *rpath, *runpath, **r;
385 void *strtbl_void; 673 void *strtbl_void;
386 674
387 if (!show_rpath) return; 675 if (!show_rpath) return;
388 676
399 Elf ## B ## _Off offset; \ 687 Elf ## B ## _Off offset; \
400 Elf ## B ## _Xword word; \ 688 Elf ## B ## _Xword word; \
401 /* Scan all the program headers */ \ 689 /* Scan all the program headers */ \
402 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 690 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
403 /* Just scan dynamic headers */ \ 691 /* Just scan dynamic headers */ \
404 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 692 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
405 offset = EGET(phdr[i].p_offset); \ 693 offset = EGET(phdr[i].p_offset); \
406 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 694 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
407 /* Just scan dynamic RPATH/RUNPATH headers */ \ 695 /* Just scan dynamic RPATH/RUNPATH headers */ \
408 dyn = DYN ## B (elf->data + offset); \ 696 dyn = DYN ## B (elf->vdata + offset); \
409 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \ 697 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
410 if (word == DT_RPATH) { \ 698 if (word == DT_RPATH) { \
411 r = &rpath; \ 699 r = &rpath; \
412 } else if (word == DT_RUNPATH) { \ 700 } else if (word == DT_RUNPATH) { \
413 r = &runpath; \ 701 r = &runpath; \
417 } \ 705 } \
418 /* Verify the memory is somewhat sane */ \ 706 /* Verify the memory is somewhat sane */ \
419 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 707 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
420 if (offset < (Elf ## B ## _Off)elf->len) { \ 708 if (offset < (Elf ## B ## _Off)elf->len) { \
421 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \ 709 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
422 *r = (char*)(elf->data + offset); \ 710 *r = elf->data + offset; \
711 /* cache the length in case we need to nuke this section later on */ \
712 if (fix_elf) \
713 offset = strlen(*r); \
423 /* If quiet, don't output paths in ld.so.conf */ \ 714 /* If quiet, don't output paths in ld.so.conf */ \
424 if (be_quiet) { \ 715 if (be_quiet) { \
425 size_t len; \ 716 size_t len; \
426 char *start, *end; \ 717 char *start, *end; \
427 /* note that we only 'chop' off leading known paths. */ \ 718 /* note that we only 'chop' off leading known paths. */ \
428 /* since *r is read-only memory, we can only move the ptr forward. */ \ 719 /* since *r is read-only memory, we can only move the ptr forward. */ \
429 start = *r; \ 720 start = *r; \
430 /* scan each path in : delimited list */ \ 721 /* scan each path in : delimited list */ \
431 while (start) { \ 722 while (start) { \
432 rpath_security_checks(elf, start); \ 723 rpath_security_checks(elf, start, get_elfdtype(word)); \
433 end = strchr(start, ':'); \ 724 end = strchr(start, ':'); \
434 len = (end ? abs(end - start) : strlen(start)); \ 725 len = (end ? abs(end - start) : strlen(start)); \
435 for (s = 0; ldpaths[s]; ++s) { \ 726 if (use_ldcache) { \
727 size_t n; \
728 const char *ldpath; \
729 array_for_each(ldpaths, n, ldpath) \
436 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \ 730 if (!strncmp(ldpath, start, len) && !ldpath[len]) { \
437 *r = (end ? end + 1 : NULL); \ 731 *r = end; \
732 /* corner case ... if RPATH reads "/usr/lib:", we want \
733 * to show ':' rather than '' */ \
734 if (end && end[1] != '\0') \
735 (*r)++; \
438 break; \ 736 break; \
439 } \ 737 } \
440 } \ 738 } \
441 if (!*r || !ldpaths[s] || !end) \ 739 if (!*r || !end) \
442 start = NULL; \ 740 break; \
443 else \ 741 else \
444 start = start + len + 1; \ 742 start = start + len + 1; \
445 } \ 743 } \
446 } \ 744 } \
745 if (*r) { \
746 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
747 /* just nuke it */ \
748 nuke_it##B: \
749 memset(*r, 0x00, offset); \
750 *r = NULL; \
751 ESET(dyn->d_tag, DT_DEBUG); \
752 ESET(dyn->d_un.d_ptr, 0); \
753 } else if (fix_elf) { \
754 /* try to clean "bad" paths */ \
755 size_t len, tmpdir_len; \
756 char *start, *end; \
757 const char *tmpdir; \
758 start = *r; \
759 tmpdir = (getenv("TMPDIR") ? : "."); \
760 tmpdir_len = strlen(tmpdir); \
761 while (1) { \
762 end = strchr(start, ':'); \
763 if (start == end) { \
764 eat_this_path##B: \
765 len = strlen(end); \
766 memmove(start, end+1, len); \
767 start[len-1] = '\0'; \
768 end = start - 1; \
769 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
770 if (!end) { \
771 if (start == *r) \
772 goto nuke_it##B; \
773 *--start = '\0'; \
774 } else \
775 goto eat_this_path##B; \
776 } \
777 if (!end) \
778 break; \
779 start = end + 1; \
780 } \
781 if (**r == '\0') \
782 goto nuke_it##B; \
783 } \
784 if (*r) \
447 if (*r) *found_rpath = 1; \ 785 *found_rpath = 1; \
786 } \
448 } \ 787 } \
449 ++dyn; \ 788 ++dyn; \
450 } \ 789 } \
451 } } 790 } }
452 SHOW_RPATH(32) 791 SHOW_RPATH(32)
470 xstrcat(ret, (runpath ? runpath : rpath), ret_len); 809 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
471 else if (!be_quiet) 810 else if (!be_quiet)
472 xstrcat(ret, " - ", ret_len); 811 xstrcat(ret, " - ", ret_len);
473} 812}
474 813
814/* Defines can be seen in glibc's sysdeps/generic/ldconfig.h */
475#define LDSO_CACHE_MAGIC "ld.so-" 815#define LDSO_CACHE_MAGIC "ld.so-"
476#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1) 816#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
477#define LDSO_CACHE_VER "1.7.0" 817#define LDSO_CACHE_VER "1.7.0"
478#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1) 818#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
479#define FLAG_ANY -1 819#define FLAG_ANY -1
488#define FLAG_X8664_LIB64 0x0300 828#define FLAG_X8664_LIB64 0x0300
489#define FLAG_S390_LIB64 0x0400 829#define FLAG_S390_LIB64 0x0400
490#define FLAG_POWERPC_LIB64 0x0500 830#define FLAG_POWERPC_LIB64 0x0500
491#define FLAG_MIPS64_LIBN32 0x0600 831#define FLAG_MIPS64_LIBN32 0x0600
492#define FLAG_MIPS64_LIBN64 0x0700 832#define FLAG_MIPS64_LIBN64 0x0700
833#define FLAG_X8664_LIBX32 0x0800
834#define FLAG_ARM_LIBHF 0x0900
835#define FLAG_AARCH64_LIB64 0x0a00
493 836
494static char *lookup_cache_lib(elfobj *, char *); 837#if defined(__GLIBC__) || defined(__UCLIBC__)
838
495static char *lookup_cache_lib(elfobj *elf, char *fname) 839static char *lookup_cache_lib(elfobj *elf, const char *fname)
496{ 840{
497 int fd = 0; 841 int fd;
498 char *strs; 842 char *strs;
499 static char buf[_POSIX_PATH_MAX] = ""; 843 static char buf[__PAX_UTILS_PATH_MAX] = "";
500 const char *cachefile = "/etc/ld.so.cache"; 844 const char *cachefile = root_rel_path("/etc/ld.so.cache");
501 struct stat st; 845 struct stat st;
502 846
503 typedef struct { 847 typedef struct {
504 char magic[LDSO_CACHE_MAGIC_LEN]; 848 char magic[LDSO_CACHE_MAGIC_LEN];
505 char version[LDSO_CACHE_VER_LEN]; 849 char version[LDSO_CACHE_VER_LEN];
515 libentry_t *libent; 859 libentry_t *libent;
516 860
517 if (fname == NULL) 861 if (fname == NULL)
518 return NULL; 862 return NULL;
519 863
520 if (ldcache == 0) { 864 if (ldcache == NULL) {
521 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1) 865 if (fstatat(root_fd, cachefile, &st, 0))
866 return NULL;
867
868 fd = openat(root_fd, cachefile, O_RDONLY);
869 if (fd == -1)
522 return NULL; 870 return NULL;
523 871
524 /* cache these values so we only map/unmap the cache file once */ 872 /* cache these values so we only map/unmap the cache file once */
525 ldcache_size = st.st_size; 873 ldcache_size = st.st_size;
526 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0); 874 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
527
528 close(fd); 875 close(fd);
529 876
530 if (ldcache == (caddr_t)-1) 877 if (ldcache == MAP_FAILED) {
878 ldcache = NULL;
531 return NULL; 879 return NULL;
880 }
532 881
533 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN)) 882 if (memcmp(header->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN) ||
883 memcmp(header->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
884 {
885 munmap(ldcache, ldcache_size);
886 ldcache = NULL;
534 return NULL; 887 return NULL;
535 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
536 return NULL;
537 } 888 }
889 } else
890 header = ldcache;
538 891
539 header = (header_t *) ldcache;
540 libent = (libentry_t *) (ldcache + sizeof(header_t)); 892 libent = ldcache + sizeof(header_t);
541 strs = (char *) &libent[header->nlibs]; 893 strs = (char *) &libent[header->nlibs];
542 894
543 for (fd = 0; fd < header->nlibs; fd++) { 895 for (fd = 0; fd < header->nlibs; ++fd) {
544 /* this should be more fine grained, but for now we assume that 896 /* This should be more fine grained, but for now we assume that
545 * diff arches will not be cached together. and we ignore the 897 * diff arches will not be cached together, and we ignore the
546 * the different multilib mips cases. */ 898 * the different multilib mips cases.
899 */
547 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK)) 900 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
548 continue; 901 continue;
549 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK)) 902 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
550 continue; 903 continue;
551 904
552 if (strcmp(fname, strs + libent[fd].sooffset) != 0) 905 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
553 continue; 906 continue;
907
908 /* Return first hit because that is how the ldso rolls */
554 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf)); 909 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
910 break;
555 } 911 }
912
556 return buf; 913 return buf;
557} 914}
558 915
916#elif defined(__NetBSD__)
917static char *lookup_cache_lib(elfobj *elf, const char *fname)
918{
919 static char buf[__PAX_UTILS_PATH_MAX] = "";
920 static struct stat st;
921 size_t n;
922 char *ldpath;
923
924 array_for_each(ldpath, n, ldpath) {
925 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", ldpath, fname) >= sizeof(buf))
926 continue; /* if the pathname is too long, or something went wrong, ignore */
927
928 if (stat(buf, &st) != 0)
929 continue; /* if the lib doesn't exist in *ldpath, look further */
930
931 /* NetBSD doesn't actually do sanity checks, it just loads the file
932 * and if that doesn't work, continues looking in other directories.
933 * This cannot easily be safely emulated, unfortunately. For now,
934 * just assume that if it exists, it's a valid library. */
935
936 return buf;
937 }
938
939 /* not found in any path */
940 return NULL;
941}
942#else
943#ifdef __ELF__
944#warning Cache support not implemented for your target
945#endif
946static char *lookup_cache_lib(elfobj *elf, const char *fname)
947{
948 return NULL;
949}
950#endif
951
952static char *lookup_config_lib(const char *fname)
953{
954 static char buf[__PAX_UTILS_PATH_MAX] = "";
955 const char *ldpath;
956 size_t n;
957
958 array_for_each(ldpaths, n, ldpath) {
959 snprintf(buf, sizeof(buf), "%s/%s", root_rel_path(ldpath), fname);
960 if (faccessat(root_fd, buf, F_OK, AT_SYMLINK_NOFOLLOW) == 0)
961 return buf;
962 }
963
964 return NULL;
965}
559 966
560static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len) 967static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
561{ 968{
562 unsigned long i; 969 unsigned long i;
563 char *needed; 970 char *needed;
564 void *strtbl_void; 971 void *strtbl_void;
565 char *p; 972 char *p;
566 973
974 /*
975 * -n -> op==0 -> print all
976 * -N -> op==1 -> print requested
977 */
567 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL; 978 if ((op == 0 && !show_needed) || (op == 1 && !find_lib))
979 return NULL;
568 980
569 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 981 strtbl_void = elf_findsecbyname(elf, ".dynstr");
570 982
571 if (elf->phdr && strtbl_void) { 983 if (elf->phdr && strtbl_void) {
572#define SHOW_NEEDED(B) \ 984#define SHOW_NEEDED(B) \
574 Elf ## B ## _Dyn *dyn; \ 986 Elf ## B ## _Dyn *dyn; \
575 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 987 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
576 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 988 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
577 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 989 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
578 Elf ## B ## _Off offset; \ 990 Elf ## B ## _Off offset; \
991 size_t matched = 0; \
992 /* Walk all the program headers to find the PT_DYNAMIC */ \
579 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 993 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
580 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 994 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) \
995 continue; \
581 offset = EGET(phdr[i].p_offset); \ 996 offset = EGET(phdr[i].p_offset); \
582 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 997 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
998 continue; \
999 /* Walk all the dynamic tags to find NEEDED entries */ \
583 dyn = DYN ## B (elf->data + offset); \ 1000 dyn = DYN ## B (elf->vdata + offset); \
584 while (EGET(dyn->d_tag) != DT_NULL) { \ 1001 while (EGET(dyn->d_tag) != DT_NULL) { \
585 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 1002 if (EGET(dyn->d_tag) == DT_NEEDED) { \
586 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 1003 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
587 if (offset >= (Elf ## B ## _Off)elf->len) { \ 1004 if (offset >= (Elf ## B ## _Off)elf->len) { \
588 ++dyn; \ 1005 ++dyn; \
589 continue; \ 1006 continue; \
590 } \ 1007 } \
591 needed = (char*)(elf->data + offset); \ 1008 needed = elf->data + offset; \
592 if (op == 0) { \ 1009 if (op == 0) { \
1010 /* -n -> print all entries */ \
593 if (!be_wewy_wewy_quiet) { \ 1011 if (!be_wewy_wewy_quiet) { \
594 if (*found_needed) xchrcat(ret, ',', ret_len); \ 1012 if (*found_needed) xchrcat(ret, ',', ret_len); \
595 if (printcache) \ 1013 if (use_ldpath) { \
1014 if ((p = lookup_config_lib(needed)) != NULL) \
1015 needed = p; \
1016 } else if (use_ldcache) { \
596 if ((p = lookup_cache_lib(elf, needed)) != NULL) \ 1017 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
597 needed = p; \ 1018 needed = p; \
1019 } \
598 xstrcat(ret, needed, ret_len); \ 1020 xstrcat(ret, needed, ret_len); \
599 } \ 1021 } \
600 *found_needed = 1; \ 1022 *found_needed = 1; \
601 } else { \ 1023 } else { \
602 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \ 1024 /* -N -> print matching entries */ \
1025 size_t n; \
1026 const char *find_lib_name; \
1027 \
1028 array_for_each(find_lib_arr, n, find_lib_name) { \
1029 int invert = 1; \
1030 if (find_lib_name[0] == '!') \
1031 invert = 0, ++find_lib_name; \
1032 if (!strcmp(find_lib_name, needed) == invert) \
1033 ++matched; \
1034 } \
1035 \
1036 if (matched == array_cnt(find_lib_arr)) { \
603 *found_lib = 1; \ 1037 *found_lib = 1; \
604 return (be_wewy_wewy_quiet ? NULL : needed); \ 1038 return (be_wewy_wewy_quiet ? NULL : find_lib); \
605 } \ 1039 } \
606 } \ 1040 } \
607 } \ 1041 } \
608 ++dyn; \ 1042 ++dyn; \
609 } \ 1043 } \
631 *found_interp = 1; \ 1065 *found_interp = 1; \
632 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \ 1066 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
633 } 1067 }
634 SHOW_INTERP(32) 1068 SHOW_INTERP(32)
635 SHOW_INTERP(64) 1069 SHOW_INTERP(64)
1070 } else {
1071 /* Walk all the program headers to find the PT_INTERP */
1072#define SHOW_PT_INTERP(B) \
1073 if (elf->elf_class == ELFCLASS ## B) { \
1074 unsigned long i; \
1075 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1076 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1077 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1078 if (EGET(phdr[i].p_type) != PT_INTERP) \
1079 continue; \
1080 *found_interp = 1; \
1081 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(phdr[i].p_offset)); \
1082 } \
636 } 1083 }
1084 SHOW_PT_INTERP(32)
1085 SHOW_PT_INTERP(64)
1086 }
1087
637 return NULL; 1088 return NULL;
638} 1089}
639static char *scanelf_file_bind(elfobj *elf, char *found_bind) 1090static const char *scanelf_file_bind(elfobj *elf, char *found_bind)
640{ 1091{
641 unsigned long i; 1092 unsigned long i;
642 struct stat s; 1093 struct stat s;
1094 bool dynamic = false;
643 1095
644 if (!show_bind) return NULL; 1096 if (!show_bind) return NULL;
645 if (!elf->phdr) return NULL; 1097 if (!elf->phdr) return NULL;
646 1098
647#define SHOW_BIND(B) \ 1099#define SHOW_BIND(B) \
649 Elf ## B ## _Dyn *dyn; \ 1101 Elf ## B ## _Dyn *dyn; \
650 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 1102 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
651 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 1103 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
652 Elf ## B ## _Off offset; \ 1104 Elf ## B ## _Off offset; \
653 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 1105 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
654 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 1106 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1107 dynamic = true; \
655 offset = EGET(phdr[i].p_offset); \ 1108 offset = EGET(phdr[i].p_offset); \
656 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 1109 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
657 dyn = DYN ## B (elf->data + offset); \ 1110 dyn = DYN ## B (elf->vdata + offset); \
658 while (EGET(dyn->d_tag) != DT_NULL) { \ 1111 while (EGET(dyn->d_tag) != DT_NULL) { \
659 if (EGET(dyn->d_tag) == DT_BIND_NOW || \ 1112 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
660 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \ 1113 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
661 { \ 1114 { \
662 if (be_quiet) return NULL; \ 1115 if (be_quiet) return NULL; \
670 SHOW_BIND(32) 1123 SHOW_BIND(32)
671 SHOW_BIND(64) 1124 SHOW_BIND(64)
672 1125
673 if (be_wewy_wewy_quiet) return NULL; 1126 if (be_wewy_wewy_quiet) return NULL;
674 1127
1128 /* 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)) { 1129 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
676 return NULL; 1130 return NULL;
677 } else { 1131 } else {
678 *found_bind = 1; 1132 *found_bind = 1;
679 return (char *) "LAZY"; 1133 return dynamic ? "LAZY" : "STATIC";
680 } 1134 }
681} 1135}
682static char *scanelf_file_soname(elfobj *elf, char *found_soname) 1136static char *scanelf_file_soname(elfobj *elf, char *found_soname)
683{ 1137{
684 unsigned long i; 1138 unsigned long i;
696 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 1150 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
697 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 1151 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
698 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 1152 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
699 Elf ## B ## _Off offset; \ 1153 Elf ## B ## _Off offset; \
700 /* only look for soname in shared objects */ \ 1154 /* only look for soname in shared objects */ \
701 if (ehdr->e_type != ET_DYN) \ 1155 if (EGET(ehdr->e_type) != ET_DYN) \
702 return NULL; \ 1156 return NULL; \
703 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 1157 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
704 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 1158 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
705 offset = EGET(phdr[i].p_offset); \ 1159 offset = EGET(phdr[i].p_offset); \
706 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 1160 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
707 dyn = DYN ## B (elf->data + offset); \ 1161 dyn = DYN ## B (elf->vdata + offset); \
708 while (EGET(dyn->d_tag) != DT_NULL) { \ 1162 while (EGET(dyn->d_tag) != DT_NULL) { \
709 if (EGET(dyn->d_tag) == DT_SONAME) { \ 1163 if (EGET(dyn->d_tag) == DT_SONAME) { \
710 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 1164 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
711 if (offset >= (Elf ## B ## _Off)elf->len) { \ 1165 if (offset >= (Elf ## B ## _Off)elf->len) { \
712 ++dyn; \ 1166 ++dyn; \
713 continue; \ 1167 continue; \
714 } \ 1168 } \
715 soname = (char*)(elf->data + offset); \ 1169 soname = elf->data + offset; \
716 *found_soname = 1; \ 1170 *found_soname = 1; \
717 return (be_wewy_wewy_quiet ? NULL : soname); \ 1171 return (be_wewy_wewy_quiet ? NULL : soname); \
718 } \ 1172 } \
719 ++dyn; \ 1173 ++dyn; \
720 } \ 1174 } \
723 SHOW_SONAME(64) 1177 SHOW_SONAME(64)
724 } 1178 }
725 1179
726 return NULL; 1180 return NULL;
727} 1181}
1182
1183/*
1184 * We support the symbol form:
1185 * [%[modifiers]%][[+-]<symbol name>][,[.....]]
1186 * If the symbol name is empty, then all symbols are matched.
1187 * If the symbol name is a glob ("*"), then all symbols are dumped (debug).
1188 * Do not rely on this output format at all.
1189 * Otherwise the symbol name is used to search (either regex or string compare).
1190 * If the first char of the symbol name is a plus ("+"), then only match
1191 * defined symbols. If it's a minus ("-"), only match undefined symbols.
1192 * Putting modifiers in between the percent signs allows for more in depth
1193 * filters. There are groups of modifiers. If you don't specify a member
1194 * of a group, then all types in that group are matched. The current
1195 * groups and their types are:
1196 * STT group: STT_NOTYPE:n STT_OBJECT:o STT_FUNC:f STT_FILE:F
1197 * STB group: STB_LOCAL:l STB_GLOBAL:g STB_WEAK:w
1198 * SHN group: SHN_UNDEF:u SHN_ABS:a SHN_COMMON:c {defined}:d
1199 * The "defined" value in the SHN group does not correspond to a SHN_xxx define.
1200 * You can search for multiple symbols at once by seperating with a comma (",").
1201 *
1202 * Some examples:
1203 * ELFs with a weak function "foo":
1204 * scanelf -s %wf%foo <ELFs>
1205 * ELFs that define the symbol "main":
1206 * scanelf -s +main <ELFs>
1207 * scanelf -s %d%main <ELFs>
1208 * ELFs that refer to the undefined symbol "brk":
1209 * scanelf -s -brk <ELFs>
1210 * scanelf -s %u%brk <ELFs>
1211 * All global defined objects in an ELF:
1212 * scanelf -s %ogd% <ELF>
1213 */
1214static void
1215scanelf_match_symname(elfobj *elf, char *found_sym, char **ret, size_t *ret_len, const char *symname,
1216 unsigned int stt, unsigned int stb, unsigned int shn, unsigned long size)
1217{
1218 const char *this_sym;
1219 size_t n;
1220
1221 array_for_each(find_sym_arr, n, this_sym) {
1222 bool inc_notype, inc_object, inc_func, inc_file,
1223 inc_local, inc_global, inc_weak,
1224 inc_def, inc_undef, inc_abs, inc_common;
1225
1226 /* symbol selection! */
1227 inc_notype = inc_object = inc_func = inc_file = \
1228 inc_local = inc_global = inc_weak = \
1229 inc_def = inc_undef = inc_abs = inc_common = \
1230 (*this_sym != '%');
1231
1232 /* parse the contents of %...% */
1233 if (!inc_notype) {
1234 while (*(this_sym++)) {
1235 if (*this_sym == '%') {
1236 ++this_sym;
1237 break;
1238 }
1239 switch (*this_sym) {
1240 case 'n': inc_notype = true; break;
1241 case 'o': inc_object = true; break;
1242 case 'f': inc_func = true; break;
1243 case 'F': inc_file = true; break;
1244 case 'l': inc_local = true; break;
1245 case 'g': inc_global = true; break;
1246 case 'w': inc_weak = true; break;
1247 case 'd': inc_def = true; break;
1248 case 'u': inc_undef = true; break;
1249 case 'a': inc_abs = true; break;
1250 case 'c': inc_common = true; break;
1251 default: err("invalid symbol selector '%c'", *this_sym);
1252 }
1253 }
1254
1255 /* If no types are matched, not match all */
1256 if (!inc_notype && !inc_object && !inc_func && !inc_file)
1257 inc_notype = inc_object = inc_func = inc_file = true;
1258 if (!inc_local && !inc_global && !inc_weak)
1259 inc_local = inc_global = inc_weak = true;
1260 if (!inc_def && !inc_undef && !inc_abs && !inc_common)
1261 inc_def = inc_undef = inc_abs = inc_common = true;
1262
1263 /* backwards compat for defined/undefined short hand */
1264 } else if (*this_sym == '+') {
1265 inc_undef = false;
1266 ++this_sym;
1267 } else if (*this_sym == '-') {
1268 inc_def = inc_abs = inc_common = false;
1269 ++this_sym;
1270 }
1271
1272 /* filter symbols */
1273 if ((!inc_notype && stt == STT_NOTYPE) || \
1274 (!inc_object && stt == STT_OBJECT) || \
1275 (!inc_func && stt == STT_FUNC ) || \
1276 (!inc_file && stt == STT_FILE ) || \
1277 (!inc_local && stb == STB_LOCAL ) || \
1278 (!inc_global && stb == STB_GLOBAL) || \
1279 (!inc_weak && stb == STB_WEAK ) || \
1280 (!inc_def && shn && shn < SHN_LORESERVE) || \
1281 (!inc_undef && shn == SHN_UNDEF ) || \
1282 (!inc_abs && shn == SHN_ABS ) || \
1283 (!inc_common && shn == SHN_COMMON))
1284 continue;
1285
1286 if (*this_sym == '*') {
1287 /* a "*" symbol gets you debug output */
1288 printf("%s(%s) %5lX %15s %15s %15s %s\n",
1289 ((*found_sym == 0) ? "\n\t" : "\t"),
1290 elf->base_filename,
1291 size,
1292 get_elfstttype(stt),
1293 get_elfstbtype(stb),
1294 get_elfshntype(shn),
1295 symname);
1296 goto matched;
1297
1298 } else {
1299 if (g_match) {
1300 /* regex match the symbol */
1301 if (regexec(find_sym_regex_arr->eles[n], symname, 0, NULL, 0) == REG_NOMATCH)
1302 continue;
1303
1304 } else if (*this_sym) {
1305 /* give empty symbols a "pass", else do a normal compare */
1306 const size_t len = strlen(this_sym);
1307 if (!(strncmp(this_sym, symname, len) == 0 &&
1308 /* Accept unversioned symbol names */
1309 (symname[len] == '\0' || symname[len] == '@')))
1310 continue;
1311 }
1312
1313 if (be_semi_verbose) {
1314 char buf[1024];
1315 snprintf(buf, sizeof(buf), "%lX %s %s",
1316 size,
1317 get_elfstttype(stt),
1318 this_sym);
1319 *ret = xstrdup(buf);
1320 } else {
1321 if (*ret) xchrcat(ret, ',', ret_len);
1322 xstrcat(ret, symname, ret_len);
1323 }
1324
1325 goto matched;
1326 }
1327 }
1328
1329 return;
1330
1331 matched:
1332 *found_sym = 1;
1333}
1334
728static char *scanelf_file_sym(elfobj *elf, char *found_sym) 1335static const char *scanelf_file_sym(elfobj *elf, char *found_sym)
729{ 1336{
730 unsigned long i;
731 char *ret; 1337 char *ret;
732 void *symtab_void, *strtab_void; 1338 void *symtab_void, *strtab_void;
733 1339
734 if (!find_sym) return NULL; 1340 if (!find_sym) return NULL;
735 ret = find_sym; 1341 ret = NULL;
736 1342
737 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void); 1343 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
738 1344
739 if (symtab_void && strtab_void) { 1345 if (symtab_void && strtab_void) {
740#define FIND_SYM(B) \ 1346#define FIND_SYM(B) \
741 if (elf->elf_class == ELFCLASS ## B) { \ 1347 if (elf->elf_class == ELFCLASS ## B) { \
742 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 1348 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
743 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 1349 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
744 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 1350 Elf ## B ## _Sym *sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
745 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 1351 Elf ## B ## _Word i, cnt = EGET(symtab->sh_entsize); \
746 char *symname; \ 1352 char *symname; \
1353 size_t ret_len = 0; \
1354 if (cnt) \
1355 cnt = EGET(symtab->sh_size) / cnt; \
747 for (i = 0; i < cnt; ++i) { \ 1356 for (i = 0; i < cnt; ++i) { \
1357 if ((void*)sym > elf->data_end) { \
1358 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1359 goto break_out; \
1360 } \
748 if (sym->st_name) { \ 1361 if (sym->st_name) { \
1362 /* make sure the symbol name is in acceptable memory range */ \
749 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 1363 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
750 if (*find_sym == '*') { \ 1364 if ((void*)symname > elf->data_end) { \
751 printf("%s(%s) %5lX %15s %s\n", \ 1365 warnf("%s: corrupt ELF symbols", elf->filename); \
752 ((*found_sym == 0) ? "\n\t" : "\t"), \ 1366 ++sym; \
753 elf->base_filename, \ 1367 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 } \ 1368 } \
1369 scanelf_match_symname(elf, found_sym, \
1370 &ret, &ret_len, symname, \
1371 ELF##B##_ST_TYPE(EGET(sym->st_info)), \
1372 ELF##B##_ST_BIND(EGET(sym->st_info)), \
1373 EGET(sym->st_shndx), \
1374 /* st_size can be 64bit, but no one is really that big, so screw em */ \
1375 EGET(sym->st_size)); \
774 } \ 1376 } \
775 ++sym; \ 1377 ++sym; \
776 } } 1378 } \
1379 }
777 FIND_SYM(32) 1380 FIND_SYM(32)
778 FIND_SYM(64) 1381 FIND_SYM(64)
779 } 1382 }
780 1383
781break_out: 1384break_out:
784 if (*find_sym != '*' && *found_sym) 1387 if (*find_sym != '*' && *found_sym)
785 return ret; 1388 return ret;
786 if (be_quiet) 1389 if (be_quiet)
787 return NULL; 1390 return NULL;
788 else 1391 else
789 return (char *)" - "; 1392 return " - ";
790} 1393}
1394
1395static const char *scanelf_file_sections(elfobj *elf, char *found_section)
1396{
1397 if (!find_section)
1398 return NULL;
1399
1400#define FIND_SECTION(B) \
1401 if (elf->elf_class == ELFCLASS ## B) { \
1402 size_t matched, n; \
1403 int invert; \
1404 const char *section_name; \
1405 Elf ## B ## _Shdr *section; \
1406 \
1407 matched = 0; \
1408 array_for_each(find_section_arr, n, section_name) { \
1409 invert = (*section_name == '!' ? 1 : 0); \
1410 section = SHDR ## B (elf_findsecbyname(elf, section_name + invert)); \
1411 if ((section == NULL && invert) || (section != NULL && !invert)) \
1412 ++matched; \
1413 } \
1414 \
1415 if (matched == array_cnt(find_section_arr)) \
1416 *found_section = 1; \
1417 }
1418 FIND_SECTION(32)
1419 FIND_SECTION(64)
1420
1421 if (be_wewy_wewy_quiet)
1422 return NULL;
1423
1424 if (*found_section)
1425 return find_section;
1426
1427 if (be_quiet)
1428 return NULL;
1429 else
1430 return " - ";
1431}
1432
791/* scan an elf file and show all the fun stuff */ 1433/* scan an elf file and show all the fun stuff */
792#define prints(str) write(fileno(stdout), str, strlen(str)) 1434#define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
793static void scanelf_file(const char *filename) 1435static int scanelf_elfobj(elfobj *elf)
794{ 1436{
795 unsigned long i; 1437 unsigned long i;
796 char found_pax, found_phdr, found_relro, found_load, found_textrel, 1438 char found_pax, found_phdr, found_relro, found_load, found_textrel,
797 found_rpath, found_needed, found_interp, found_bind, found_soname, 1439 found_rpath, found_needed, found_interp, found_bind, found_soname,
798 found_sym, found_lib, found_file, found_textrels; 1440 found_sym, found_lib, found_file, found_textrels, found_section;
799 elfobj *elf;
800 struct stat st;
801 static char *out_buffer = NULL; 1441 static char *out_buffer = NULL;
802 static size_t out_len; 1442 static size_t out_len;
803 1443
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 = \ 1444 found_pax = found_phdr = found_relro = found_load = found_textrel = \
820 found_rpath = found_needed = found_interp = found_bind = found_soname = \ 1445 found_rpath = found_needed = found_interp = found_bind = found_soname = \
821 found_sym = found_lib = found_file = found_textrels = 0; 1446 found_sym = found_lib = found_file = found_textrels = found_section = 0;
822 1447
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) 1448 if (be_verbose > 2)
830 printf("%s: scanning file {%s,%s}\n", filename, 1449 printf("%s: scanning file {%s,%s}\n", elf->filename,
831 get_elfeitype(EI_CLASS, elf->elf_class), 1450 get_elfeitype(EI_CLASS, elf->elf_class),
832 get_elfeitype(EI_DATA, elf->data[EI_DATA])); 1451 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
833 else if (be_verbose) 1452 else if (be_verbose > 1)
834 printf("%s: scanning file\n", filename); 1453 printf("%s: scanning file\n", elf->filename);
835 1454
836 /* init output buffer */ 1455 /* init output buffer */
837 if (!out_buffer) { 1456 if (!out_buffer) {
838 out_len = sizeof(char) * 80; 1457 out_len = sizeof(char) * 80;
839 out_buffer = (char*)xmalloc(out_len); 1458 out_buffer = xmalloc(out_len);
840 } 1459 }
841 *out_buffer = '\0'; 1460 *out_buffer = '\0';
842 1461
843 /* show the header */ 1462 /* show the header */
844 if (!be_quiet && show_banner) { 1463 if (!be_quiet && show_banner) {
845 for (i = 0; out_format[i]; ++i) { 1464 for (i = 0; out_format[i]; ++i) {
846 if (!IS_MODIFIER(out_format[i])) continue; 1465 if (!IS_MODIFIER(out_format[i])) continue;
847 1466
848 switch (out_format[++i]) { 1467 switch (out_format[++i]) {
1468 case '+': break;
849 case '%': break; 1469 case '%': break;
850 case '#': break; 1470 case '#': break;
851 case 'F': 1471 case 'F':
852 case 'p': 1472 case 'p':
853 case 'f': prints("FILE "); found_file = 1; break; 1473 case 'f': prints("FILE "); found_file = 1; break;
854 case 'o': prints(" TYPE "); break; 1474 case 'o': prints(" TYPE "); break;
855 case 'x': prints(" PAX "); break; 1475 case 'x': prints(" PAX "); break;
856 case 'e': prints("STK/REL/PTL "); break; 1476 case 'e': prints("STK/REL/PTL "); break;
857 case 't': prints("TEXTREL "); break; 1477 case 't': prints("TEXTREL "); break;
858 case 'r': prints("RPATH "); break; 1478 case 'r': prints("RPATH "); break;
1479 case 'M': prints("CLASS "); break;
1480 case 'l':
859 case 'n': prints("NEEDED "); break; 1481 case 'n': prints("NEEDED "); break;
860 case 'i': prints("INTERP "); break; 1482 case 'i': prints("INTERP "); break;
861 case 'b': prints("BIND "); break; 1483 case 'b': prints("BIND "); break;
1484 case 'Z': prints("SIZE "); break;
862 case 'S': prints("SONAME "); break; 1485 case 'S': prints("SONAME "); break;
863 case 's': prints("SYM "); break; 1486 case 's': prints("SYM "); break;
864 case 'N': prints("LIB "); break; 1487 case 'N': prints("LIB "); break;
865 case 'T': prints("TEXTRELS "); break; 1488 case 'T': prints("TEXTRELS "); break;
1489 case 'k': prints("SECTION "); break;
1490 case 'a': prints("ARCH "); break;
1491 case 'I': prints("OSABI "); break;
1492 case 'Y': prints("EABI "); break;
1493 case 'O': prints("PERM "); break;
1494 case 'D': prints("ENDIAN "); break;
866 default: warnf("'%c' has no title ?", out_format[i]); 1495 default: warnf("'%c' has no title ?", out_format[i]);
867 } 1496 }
868 } 1497 }
869 if (!found_file) prints("FILE "); 1498 if (!found_file) prints("FILE ");
870 prints("\n"); 1499 prints("\n");
874 1503
875 /* dump all the good stuff */ 1504 /* dump all the good stuff */
876 for (i = 0; out_format[i]; ++i) { 1505 for (i = 0; out_format[i]; ++i) {
877 const char *out; 1506 const char *out;
878 const char *tmp; 1507 const char *tmp;
879 1508 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])) { 1509 if (!IS_MODIFIER(out_format[i])) {
885 xchrcat(&out_buffer, out_format[i], &out_len); 1510 xchrcat(&out_buffer, out_format[i], &out_len);
886 continue; 1511 continue;
887 } 1512 }
888 1513
889 out = NULL; 1514 out = NULL;
890 be_wewy_wewy_quiet = (out_format[i] == '#'); 1515 be_wewy_wewy_quiet = (out_format[i] == '#');
1516 be_semi_verbose = (out_format[i] == '+');
891 switch (out_format[++i]) { 1517 switch (out_format[++i]) {
1518 case '+':
892 case '%': 1519 case '%':
893 case '#': 1520 case '#':
894 xchrcat(&out_buffer, out_format[i], &out_len); break; 1521 xchrcat(&out_buffer, out_format[i], &out_len); break;
895 case 'F': 1522 case 'F':
896 found_file = 1; 1523 found_file = 1;
897 if (be_wewy_wewy_quiet) break; 1524 if (be_wewy_wewy_quiet) break;
898 xstrcat(&out_buffer, filename, &out_len); 1525 xstrcat(&out_buffer, elf->filename, &out_len);
899 break; 1526 break;
900 case 'p': 1527 case 'p':
901 found_file = 1; 1528 found_file = 1;
902 if (be_wewy_wewy_quiet) break; 1529 if (be_wewy_wewy_quiet) break;
903 tmp = filename; 1530 tmp = elf->filename;
904 if (search_path) { 1531 if (search_path) {
905 ssize_t len_search = strlen(search_path); 1532 ssize_t len_search = strlen(search_path);
906 ssize_t len_file = strlen(filename); 1533 ssize_t len_file = strlen(elf->filename);
907 if (!strncmp(filename, search_path, len_search) && \ 1534 if (!strncmp(elf->filename, search_path, len_search) && \
908 len_file > len_search) 1535 len_file > len_search)
909 tmp += len_search; 1536 tmp += len_search;
910 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++; 1537 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
911 } 1538 }
912 xstrcat(&out_buffer, tmp, &out_len); 1539 xstrcat(&out_buffer, tmp, &out_len);
913 break; 1540 break;
914 case 'f': 1541 case 'f':
915 found_file = 1; 1542 found_file = 1;
916 if (be_wewy_wewy_quiet) break; 1543 if (be_wewy_wewy_quiet) break;
917 tmp = strrchr(filename, '/'); 1544 tmp = strrchr(elf->filename, '/');
918 tmp = (tmp == NULL ? filename : tmp+1); 1545 tmp = (tmp == NULL ? elf->filename : tmp+1);
919 xstrcat(&out_buffer, tmp, &out_len); 1546 xstrcat(&out_buffer, tmp, &out_len);
920 break; 1547 break;
921 case 'o': out = get_elfetype(elf); break; 1548 case 'o': out = get_elfetype(elf); break;
922 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1549 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; 1550 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; 1551 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
925 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break; 1552 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; 1553 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1554 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1555 case 'D': out = get_endian(elf); break;
1556 case 'O': out = strfileperms(elf->filename); break;
927 case 'n': 1557 case 'n':
928 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break; 1558 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; 1559 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
930 case 'b': out = scanelf_file_bind(elf, &found_bind); break; 1560 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
931 case 'S': out = scanelf_file_soname(elf, &found_soname); break; 1561 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
932 case 's': out = scanelf_file_sym(elf, &found_sym); break; 1562 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1563 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1564 case 'a': out = get_elfemtype(elf); break;
1565 case 'I': out = get_elfosabi(elf); break;
1566 case 'Y': out = get_elf_eabi(elf); break;
1567 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]); 1568 default: warnf("'%c' has no scan code?", out_format[i]);
934 } 1569 }
935 if (out) { 1570 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); 1571 xstrcat(&out_buffer, out, &out_len);
941 }
942 } 1572 }
943 1573
944#define FOUND_SOMETHING() \ 1574#define FOUND_SOMETHING() \
945 (found_pax || found_phdr || found_relro || found_load || found_textrel || \ 1575 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
946 found_rpath || found_needed || found_interp || found_bind || \ 1576 found_rpath || found_needed || found_interp || found_bind || \
947 found_soname || found_sym || found_lib || found_textrels) 1577 found_soname || found_sym || found_lib || found_textrels || found_section )
948 1578
949 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) { 1579 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
950 xchrcat(&out_buffer, ' ', &out_len); 1580 xchrcat(&out_buffer, ' ', &out_len);
951 xstrcat(&out_buffer, filename, &out_len); 1581 xstrcat(&out_buffer, elf->filename, &out_len);
952 } 1582 }
953 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) { 1583 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
954 puts(out_buffer); 1584 puts(out_buffer);
955 fflush(stdout); 1585 fflush(stdout);
956 } 1586 }
957 1587
1588 return 0;
1589}
1590
1591/* scan a single elf */
1592static int scanelf_elf(const char *filename, int fd, size_t len)
1593{
1594 int ret = 1;
1595 size_t n;
1596 const char *match_etype;
1597 elfobj *elf;
1598
1599 /* Verify this is a real ELF */
1600 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1601 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1602 return 2;
1603 }
1604
1605 /* Possibly filter based on ELF bitness */
1606 switch (match_bits) {
1607 case 32:
1608 if (elf->elf_class != ELFCLASS32)
1609 goto done;
1610 break;
1611 case 64:
1612 if (elf->elf_class != ELFCLASS64)
1613 goto done;
1614 break;
1615 }
1616
1617 /* Possibly filter based on the ELF's e_type field */
1618 array_for_each(match_etypes, n, match_etype)
1619 if (etype_lookup(match_etype) == get_etype(elf))
1620 goto scanit;
1621 if (array_cnt(match_etypes))
1622 goto done;
1623
1624 scanit:
1625 ret = scanelf_elfobj(elf);
1626
1627 done:
958 unreadelf(elf); 1628 unreadelf(elf);
1629 return ret;
1630}
1631
1632/* scan an archive of elfs */
1633static int scanelf_archive(const char *filename, int fd, size_t len)
1634{
1635 archive_handle *ar;
1636 archive_member *m;
1637 char *ar_buffer;
1638 elfobj *elf;
1639
1640 ar = ar_open_fd(filename, fd);
1641 if (ar == NULL)
1642 return 1;
1643
1644 ar_buffer = mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1645 while ((m = ar_next(ar)) != NULL) {
1646 off_t cur_pos = lseek(fd, 0, SEEK_CUR);
1647 if (cur_pos == -1)
1648 errp("lseek() failed");
1649 elf = readelf_buffer(m->name, ar_buffer + cur_pos, m->size);
1650 if (elf) {
1651 scanelf_elfobj(elf);
1652 unreadelf(elf);
1653 }
1654 }
1655 munmap(ar_buffer, len);
1656
1657 return 0;
1658}
1659/* scan a file which may be an elf or an archive or some other magical beast */
1660static int scanelf_fileat(int dir_fd, const char *filename, const struct stat *st_cache)
1661{
1662 const struct stat *st = st_cache;
1663 struct stat symlink_st;
1664 int fd;
1665
1666 /* always handle regular files and handle symlinked files if no -y */
1667 if (S_ISLNK(st->st_mode)) {
1668 if (!scan_symlink)
1669 return 1;
1670 fstatat(dir_fd, filename, &symlink_st, 0);
1671 st = &symlink_st;
1672 }
1673
1674 if (!S_ISREG(st->st_mode)) {
1675 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1676 return 1;
1677 }
1678
1679 if (match_perms) {
1680 if ((st->st_mode | match_perms) != st->st_mode)
1681 return 1;
1682 }
1683 fd = openat(dir_fd, filename, (fix_elf ? O_RDWR : O_RDONLY) | O_CLOEXEC);
1684 if (fd == -1) {
1685 if (fix_elf && errno == ETXTBSY)
1686 warnp("%s: could not fix", filename);
1687 else if (be_verbose > 2)
1688 printf("%s: skipping file: %s\n", filename, strerror(errno));
1689 return 1;
1690 }
1691
1692 if (scanelf_elf(filename, fd, st->st_size) == 2) {
1693 /* if it isn't an ELF, maybe it's an .a archive */
1694 if (scan_archives)
1695 scanelf_archive(filename, fd, st->st_size);
1696
1697 /*
1698 * unreadelf() implicitly closes its fd, so only close it
1699 * when we are returning it in the non-ELF case
1700 */
1701 close(fd);
1702 }
1703
1704 return 0;
959} 1705}
960 1706
961/* scan a directory for ET_EXEC files and print when we find one */ 1707/* scan a directory for ET_EXEC files and print when we find one */
962static void scanelf_dir(const char *path) 1708static int scanelf_dirat(int dir_fd, const char *path)
963{ 1709{
964 register DIR *dir; 1710 register DIR *dir;
965 register struct dirent *dentry; 1711 register struct dirent *dentry;
966 struct stat st_top, st; 1712 struct stat st_top, st;
967 char buf[_POSIX_PATH_MAX]; 1713 char buf[__PAX_UTILS_PATH_MAX], *subpath;
968 size_t pathlen = 0, len = 0; 1714 size_t pathlen = 0, len = 0;
1715 int ret = 0;
1716 int subdir_fd;
969 1717
970 /* make sure path exists */ 1718 /* make sure path exists */
971 if (lstat(path, &st_top) == -1) { 1719 if (fstatat(dir_fd, path, &st_top, AT_SYMLINK_NOFOLLOW) == -1) {
972 if (be_verbose > 2) printf("%s: does not exist\n", path); 1720 if (be_verbose > 2) printf("%s: does not exist\n", path);
973 return; 1721 return 1;
974 } 1722 }
975 1723
976 /* ok, if it isn't a directory, assume we can open it */ 1724 /* ok, if it isn't a directory, assume we can open it */
977 if (!S_ISDIR(st_top.st_mode)) { 1725 if (!S_ISDIR(st_top.st_mode))
978 scanelf_file(path); 1726 return scanelf_fileat(dir_fd, path, &st_top);
979 return;
980 }
981 1727
982 /* now scan the dir looking for fun stuff */ 1728 /* now scan the dir looking for fun stuff */
983 if ((dir = opendir(path)) == NULL) { 1729 subdir_fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
984 warnf("could not opendir %s: %s", path, strerror(errno)); 1730 if (subdir_fd == -1)
1731 dir = NULL;
1732 else
1733 dir = fdopendir(subdir_fd);
1734 if (dir == NULL) {
1735 if (subdir_fd != -1)
1736 close(subdir_fd);
1737 else if (be_verbose > 2)
1738 printf("%s: skipping dir: %s\n", path, strerror(errno));
985 return; 1739 return 1;
986 } 1740 }
987 if (be_verbose) printf("%s: scanning dir\n", path); 1741 if (be_verbose > 1) printf("%s: scanning dir\n", path);
988 1742
989 pathlen = strlen(path); 1743 subpath = stpcpy(buf, path);
1744 if (subpath[-1] != '/')
1745 *subpath++ = '/';
1746 pathlen = subpath - buf;
990 while ((dentry = readdir(dir))) { 1747 while ((dentry = readdir(dir))) {
991 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1748 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
992 continue; 1749 continue;
1750
1751 if (fstatat(subdir_fd, dentry->d_name, &st, AT_SYMLINK_NOFOLLOW) == -1)
1752 continue;
1753
993 len = (pathlen + 1 + strlen(dentry->d_name) + 1); 1754 len = strlen(dentry->d_name);
994 if (len >= sizeof(buf)) { 1755 if (len + pathlen + 1 >= sizeof(buf)) {
995 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path, 1756 warnf("Skipping '%s%s': len > sizeof(buf); %zu > %zu\n",
996 (unsigned long)len, (unsigned long)sizeof(buf)); 1757 path, dentry->d_name, len + pathlen + 1, sizeof(buf));
997 continue; 1758 continue;
998 } 1759 }
999 sprintf(buf, "%s/%s", path, dentry->d_name); 1760 memcpy(subpath, dentry->d_name, len);
1000 if (lstat(buf, &st) != -1) { 1761 subpath[len] = '\0';
1762
1001 if (S_ISREG(st.st_mode)) 1763 if (S_ISREG(st.st_mode))
1002 scanelf_file(buf); 1764 ret = scanelf_fileat(dir_fd, buf, &st);
1003 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1765 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1004 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1766 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1005 scanelf_dir(buf); 1767 ret = scanelf_dirat(dir_fd, buf);
1006 }
1007 } 1768 }
1008 } 1769 }
1009 closedir(dir); 1770 closedir(dir);
1010}
1011 1771
1772 return ret;
1773}
1774static int scanelf_dir(const char *path)
1775{
1776 return scanelf_dirat(root_fd, root_rel_path(path));
1777}
1778
1012static int scanelf_from_file(char *filename) 1779static int scanelf_from_file(const char *filename)
1013{ 1780{
1014 FILE *fp = NULL; 1781 FILE *fp;
1015 char *p; 1782 char *p, *path;
1016 char path[_POSIX_PATH_MAX]; 1783 size_t len;
1784 int ret;
1017 1785
1018 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL)) 1786 if (strcmp(filename, "-") == 0)
1019 fp = stdin; 1787 fp = stdin;
1020 else if ((fp = fopen(filename, "r")) == NULL) 1788 else if ((fp = fopen(filename, "r")) == NULL)
1021 return 1; 1789 return 1;
1022 1790
1023 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1791 path = NULL;
1792 len = 0;
1793 ret = 0;
1794 while (getline(&path, &len, fp) != -1) {
1024 if ((p = strchr(path, '\n')) != NULL) 1795 if ((p = strchr(path, '\n')) != NULL)
1025 *p = 0; 1796 *p = 0;
1026 search_path = path; 1797 search_path = path;
1027 scanelf_dir(path); 1798 ret = scanelf_dir(path);
1028 } 1799 }
1800 free(path);
1801
1029 if (fp != stdin) 1802 if (fp != stdin)
1030 fclose(fp); 1803 fclose(fp);
1804
1031 return 0; 1805 return ret;
1032} 1806}
1033 1807
1034static void load_ld_so_conf() 1808#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1809
1810static int _load_ld_cache_config(const char *fname)
1035{ 1811{
1036 FILE *fp = NULL; 1812 FILE *fp = NULL;
1037 char *p; 1813 char *p, *path;
1038 char path[_POSIX_PATH_MAX]; 1814 size_t len;
1039 int i = 0; 1815 int curr_fd = -1;
1040 1816
1041 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1817 fp = fopenat_r(root_fd, root_rel_path(fname));
1818 if (fp == NULL)
1042 return; 1819 return -1;
1043 1820
1044 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1821 path = NULL;
1045 if (*path != '/') 1822 len = 0;
1046 continue; 1823 while (getline(&path, &len, fp) != -1) {
1047
1048 if ((p = strrchr(path, '\r')) != NULL) 1824 if ((p = strrchr(path, '\r')) != NULL)
1049 *p = 0; 1825 *p = 0;
1050 if ((p = strchr(path, '\n')) != NULL) 1826 if ((p = strchr(path, '\n')) != NULL)
1051 *p = 0; 1827 *p = 0;
1052 1828
1053 ldpaths[i++] = xstrdup(path); 1829 /* recursive includes of the same file will make this segfault. */
1830 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1831 glob_t gl;
1832 size_t x;
1833 const char *gpath;
1054 1834
1055 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths)) 1835 /* re-use existing path buffer ... need to be creative */
1056 break; 1836 if (path[8] != '/')
1837 gpath = memcpy(path + 3, "/etc/", 5);
1838 else
1839 gpath = path + 8;
1840 if (root_fd != AT_FDCWD) {
1841 if (curr_fd == -1) {
1842 curr_fd = open(".", O_RDONLY|O_CLOEXEC);
1843 if (fchdir(root_fd))
1844 errp("unable to change to root dir");
1845 }
1846 gpath = root_rel_path(gpath);
1847 }
1848
1849 if (glob(gpath, 0, NULL, &gl) == 0) {
1850 for (x = 0; x < gl.gl_pathc; ++x) {
1851 /* try to avoid direct loops */
1852 if (strcmp(gl.gl_pathv[x], fname) == 0)
1853 continue;
1854 _load_ld_cache_config(gl.gl_pathv[x]);
1855 }
1856 globfree(&gl);
1857 }
1858
1859 /* failed globs are ignored by glibc */
1860 continue;
1057 } 1861 }
1058 ldpaths[i] = NULL; 1862
1863 if (*path != '/')
1864 continue;
1865
1866 xarraypush_str(ldpaths, path);
1867 }
1868 free(path);
1059 1869
1060 fclose(fp); 1870 fclose(fp);
1871
1872 if (curr_fd != -1) {
1873 if (fchdir(curr_fd))
1874 {/* don't care */}
1875 close(curr_fd);
1876 }
1877
1878 return 0;
1879}
1880
1881#elif defined(__FreeBSD__) || defined(__DragonFly__)
1882
1883static int _load_ld_cache_config(const char *fname)
1884{
1885 FILE *fp = NULL;
1886 char *b = NULL, *p;
1887 struct elfhints_hdr hdr;
1888
1889 fp = fopenat_r(root_fd, root_rel_path(fname));
1890 if (fp == NULL)
1891 return -1;
1892
1893 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1894 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1895 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1896 {
1897 fclose(fp);
1898 return -1;
1899 }
1900
1901 b = xmalloc(hdr.dirlistlen + 1);
1902 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1903 fclose(fp);
1904 free(b);
1905 return -1;
1906 }
1907
1908 while ((p = strsep(&b, ":"))) {
1909 if (*p == '\0')
1910 continue;
1911 xarraypush_str(ldpaths, p);
1912 }
1913
1914 free(b);
1915 fclose(fp);
1916 return 0;
1917}
1918
1919#else
1920#ifdef __ELF__
1921#warning Cache config support not implemented for your target
1922#endif
1923static int _load_ld_cache_config(const char *fname)
1924{
1925 return 0;
1926}
1927#endif
1928
1929static void load_ld_cache_config(const char *fname)
1930{
1931 bool scan_l, scan_ul, scan_ull;
1932 size_t n;
1933 const char *ldpath;
1934
1935 _load_ld_cache_config(fname);
1936
1937 scan_l = scan_ul = scan_ull = false;
1938 array_for_each(ldpaths, n, ldpath) {
1939 if (!scan_l && !strcmp(ldpath, "/lib")) scan_l = true;
1940 if (!scan_ul && !strcmp(ldpath, "/usr/lib")) scan_ul = true;
1941 if (!scan_ull && !strcmp(ldpath, "/usr/local/lib")) scan_ull = true;
1942 }
1943
1944 if (!scan_l) xarraypush_str(ldpaths, "/lib");
1945 if (!scan_ul) xarraypush_str(ldpaths, "/usr/lib");
1946 if (!scan_ull) xarraypush_str(ldpaths, "/usr/local/lib");
1061} 1947}
1062 1948
1063/* scan /etc/ld.so.conf for paths */ 1949/* scan /etc/ld.so.conf for paths */
1064static void scanelf_ldpath() 1950static void scanelf_ldpath(void)
1065{ 1951{
1066 char scan_l, scan_ul, scan_ull; 1952 size_t n;
1067 int i = 0; 1953 const char *ldpath;
1068 1954
1069 if (!ldpaths[0]) 1955 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]); 1956 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} 1957}
1086 1958
1087/* scan env PATH for paths */ 1959/* scan env PATH for paths */
1088static void scanelf_envpath() 1960static void scanelf_envpath(void)
1089{ 1961{
1090 char *path, *p; 1962 char *path, *p;
1091 1963
1092 path = getenv("PATH"); 1964 path = getenv("PATH");
1093 if (!path) 1965 if (!path)
1100 } 1972 }
1101 1973
1102 free(path); 1974 free(path);
1103} 1975}
1104 1976
1105 1977/* 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" 1978#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZCBhV"
1108#define a_argument required_argument 1979#define a_argument required_argument
1109static struct option const long_opts[] = { 1980static struct option const long_opts[] = {
1110 {"path", no_argument, NULL, 'p'}, 1981 {"path", no_argument, NULL, 'p'},
1111 {"ldpath", no_argument, NULL, 'l'}, 1982 {"ldpath", no_argument, NULL, 'l'},
1983 {"use-ldpath",no_argument, NULL, 129},
1984 {"root", a_argument, NULL, 128},
1112 {"recursive", no_argument, NULL, 'R'}, 1985 {"recursive", no_argument, NULL, 'R'},
1113 {"mount", no_argument, NULL, 'm'}, 1986 {"mount", no_argument, NULL, 'm'},
1114 {"symlink", no_argument, NULL, 'y'}, 1987 {"symlink", no_argument, NULL, 'y'},
1988 {"archives", no_argument, NULL, 'A'},
1989 {"ldcache", no_argument, NULL, 'L'},
1990 {"fix", no_argument, NULL, 'X'},
1991 {"setpax", a_argument, NULL, 'z'},
1115 {"pax", no_argument, NULL, 'x'}, 1992 {"pax", no_argument, NULL, 'x'},
1116 {"header", no_argument, NULL, 'e'}, 1993 {"header", no_argument, NULL, 'e'},
1117 {"textrel", no_argument, NULL, 't'}, 1994 {"textrel", no_argument, NULL, 't'},
1118 {"rpath", no_argument, NULL, 'r'}, 1995 {"rpath", no_argument, NULL, 'r'},
1119 {"needed", no_argument, NULL, 'n'}, 1996 {"needed", no_argument, NULL, 'n'},
1120 {"ldcache", no_argument, NULL, 'L'},
1121 {"interp", no_argument, NULL, 'i'}, 1997 {"interp", no_argument, NULL, 'i'},
1122 {"bind", no_argument, NULL, 'b'}, 1998 {"bind", no_argument, NULL, 'b'},
1123 {"soname", no_argument, NULL, 'S'}, 1999 {"soname", no_argument, NULL, 'S'},
1124 {"symbol", a_argument, NULL, 's'}, 2000 {"symbol", a_argument, NULL, 's'},
2001 {"section", a_argument, NULL, 'k'},
1125 {"lib", a_argument, NULL, 'N'}, 2002 {"lib", a_argument, NULL, 'N'},
1126 {"gmatch", no_argument, NULL, 'g'}, 2003 {"gmatch", no_argument, NULL, 'g'},
1127 {"textrels", no_argument, NULL, 'T'}, 2004 {"textrels", no_argument, NULL, 'T'},
2005 {"etype", a_argument, NULL, 'E'},
2006 {"bits", a_argument, NULL, 'M'},
2007 {"endian", no_argument, NULL, 'D'},
2008 {"osabi", no_argument, NULL, 'I'},
2009 {"eabi", no_argument, NULL, 'Y'},
2010 {"perms", a_argument, NULL, 'O'},
2011 {"size", no_argument, NULL, 'Z'},
1128 {"all", no_argument, NULL, 'a'}, 2012 {"all", no_argument, NULL, 'a'},
1129 {"quiet", no_argument, NULL, 'q'}, 2013 {"quiet", no_argument, NULL, 'q'},
1130 {"verbose", no_argument, NULL, 'v'}, 2014 {"verbose", no_argument, NULL, 'v'},
1131 {"format", a_argument, NULL, 'F'}, 2015 {"format", a_argument, NULL, 'F'},
1132 {"from", a_argument, NULL, 'f'}, 2016 {"from", a_argument, NULL, 'f'},
1133 {"file", a_argument, NULL, 'o'}, 2017 {"file", a_argument, NULL, 'o'},
2018 {"nocolor", no_argument, NULL, 'C'},
1134 {"nobanner", no_argument, NULL, 'B'}, 2019 {"nobanner", no_argument, NULL, 'B'},
1135 {"help", no_argument, NULL, 'h'}, 2020 {"help", no_argument, NULL, 'h'},
1136 {"version", no_argument, NULL, 'V'}, 2021 {"version", no_argument, NULL, 'V'},
1137 {NULL, no_argument, NULL, 0x0} 2022 {NULL, no_argument, NULL, 0x0}
1138}; 2023};
1139 2024
1140static const char *opts_help[] = { 2025static const char * const opts_help[] = {
1141 "Scan all directories in PATH environment", 2026 "Scan all directories in PATH environment",
1142 "Scan all directories in /etc/ld.so.conf", 2027 "Scan all directories in /etc/ld.so.conf",
2028 "Use ld.so.conf to show full path (use with -r/-n)",
2029 "Root directory (use with -l or -p)",
1143 "Scan directories recursively", 2030 "Scan directories recursively",
1144 "Don't recursively cross mount points", 2031 "Don't recursively cross mount points",
1145 "Don't scan symlinks\n", 2032 "Don't scan symlinks",
2033 "Scan archives (.a files)",
2034 "Utilize ld.so.cache to show full path (use with -r/-n)",
2035 "Try and 'fix' bad things (use with -r/-e)",
2036 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1146 "Print PaX markings", 2037 "Print PaX markings",
1147 "Print GNU_STACK/PT_LOAD markings", 2038 "Print GNU_STACK/PT_LOAD markings",
1148 "Print TEXTREL information", 2039 "Print TEXTREL information",
1149 "Print RPATH information", 2040 "Print RPATH information",
1150 "Print NEEDED information", 2041 "Print NEEDED information",
1151 "Resolve NEEDED information (use with -n)",
1152 "Print INTERP information", 2042 "Print INTERP information",
1153 "Print BIND information", 2043 "Print BIND information",
1154 "Print SONAME information", 2044 "Print SONAME information",
1155 "Find a specified symbol", 2045 "Find a specified symbol",
2046 "Find a specified section",
1156 "Find a specified library", 2047 "Find a specified library",
1157 "Use strncmp to match libraries. (use with -N)", 2048 "Use regex rather than string compare (with -s); specify twice for case insensitive",
1158 "Locate cause of TEXTREL", 2049 "Locate cause of TEXTREL",
1159 "Print all scanned info (-x -e -t -r -b)\n", 2050 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
2051 "Print only ELF files matching numeric bits",
2052 "Print Endianness",
2053 "Print OSABI",
2054 "Print EABI (EM_ARM Only)",
2055 "Print only ELF files matching octal permissions",
2056 "Print ELF file size",
2057 "Print all useful/simple info\n",
1160 "Only output 'bad' things", 2058 "Only output 'bad' things",
1161 "Be verbose (can be specified more than once)", 2059 "Be verbose (can be specified more than once)",
1162 "Use specified format for output", 2060 "Use specified format for output",
1163 "Read input stream from a filename", 2061 "Read input stream from a filename",
1164 "Write output stream to a filename", 2062 "Write output stream to a filename",
2063 "Don't emit color in output",
1165 "Don't display the header", 2064 "Don't display the header",
1166 "Print this help and exit", 2065 "Print this help and exit",
1167 "Print version and exit", 2066 "Print version and exit",
1168 NULL 2067 NULL
1169}; 2068};
1170 2069
1171/* display usage and exit */ 2070/* display usage and exit */
1172static void usage(int status) 2071static void usage(int status)
1173{ 2072{
1174 unsigned long i; 2073 const char a_arg[] = "<arg>";
2074 size_t a_arg_len = strlen(a_arg) + 2;
2075 size_t i;
2076 int optlen;
1175 printf("* Scan ELF binaries for stuff\n\n" 2077 printf("* Scan ELF binaries for stuff\n\n"
1176 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0); 2078 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1177 printf("Options: -[%s]\n", PARSE_FLAGS); 2079 printf("Options: -[%s]\n", PARSE_FLAGS);
2080
2081 /* prescan the --long opt length to auto-align */
2082 optlen = 0;
1178 for (i = 0; long_opts[i].name; ++i) 2083 for (i = 0; long_opts[i].name; ++i) {
2084 int l = strlen(long_opts[i].name);
2085 if (long_opts[i].has_arg == a_argument)
2086 l += a_arg_len;
2087 optlen = max(l, optlen);
2088 }
2089
2090 for (i = 0; long_opts[i].name; ++i) {
2091 /* first output the short flag if it has one */
2092 if (long_opts[i].val > '~')
2093 printf(" ");
2094 else
2095 printf(" -%c, ", long_opts[i].val);
2096
2097 /* then the long flag */
1179 if (long_opts[i].has_arg == no_argument) 2098 if (long_opts[i].has_arg == no_argument)
1180 printf(" -%c, --%-13s* %s\n", long_opts[i].val, 2099 printf("--%-*s", optlen, long_opts[i].name);
1181 long_opts[i].name, opts_help[i]);
1182 else 2100 else
1183 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val, 2101 printf("--%s %s %*s", long_opts[i].name, a_arg,
1184 long_opts[i].name, opts_help[i]); 2102 (int)(optlen - strlen(long_opts[i].name) - a_arg_len), "");
1185 2103
1186 if (status != EXIT_SUCCESS) 2104 /* finally the help text */
1187 exit(status); 2105 printf("* %s\n", opts_help[i]);
2106 }
1188 2107
1189 puts("\nThe format modifiers for the -F option are:"); 2108 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); 2109 exit(status);
1200} 2110}
1201 2111
1202/* parse command line arguments and preform needed actions */ 2112/* parse command line arguments and preform needed actions */
2113#define do_pax_state(option, flag) \
2114 if (islower(option)) { \
2115 flags &= ~PF_##flag; \
2116 flags |= PF_NO##flag; \
2117 } else { \
2118 flags &= ~PF_NO##flag; \
2119 flags |= PF_##flag; \
2120 }
2121static void parse_delimited(array_t *arr, char *arg, const char *delim)
2122{
2123 char *ele = strtok(arg, delim);
2124 if (!ele) /* edge case: -s '' */
2125 xarraypush_str(arr, "");
2126 while (ele) {
2127 xarraypush_str(arr, ele);
2128 ele = strtok(NULL, delim);
2129 }
2130}
1203static void parseargs(int argc, char *argv[]) 2131static int parseargs(int argc, char *argv[])
1204{ 2132{
1205 int i; 2133 int i;
1206 char *from_file = NULL; 2134 const char *from_file = NULL;
2135 int ret = 0;
2136 char load_cache_config = 0;
1207 2137
1208 opterr = 0; 2138 opterr = 0;
1209 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 2139 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1210 switch (i) { 2140 switch (i) {
1211 2141
1215 VERSION, __FILE__, __DATE__, rcsid, argv0); 2145 VERSION, __FILE__, __DATE__, rcsid, argv0);
1216 exit(EXIT_SUCCESS); 2146 exit(EXIT_SUCCESS);
1217 break; 2147 break;
1218 case 'h': usage(EXIT_SUCCESS); break; 2148 case 'h': usage(EXIT_SUCCESS); break;
1219 case 'f': 2149 case 'f':
1220 if (from_file) err("Don't specify -f twice"); 2150 if (from_file) warn("You prob don't want to specify -f twice");
1221 from_file = xstrdup(optarg); 2151 from_file = optarg;
2152 break;
2153 case 'E':
2154 /* historically, this was comma delimited */
2155 parse_delimited(match_etypes, optarg, ",");
2156 break;
2157 case 'M':
2158 match_bits = atoi(optarg);
2159 if (match_bits == 0) {
2160 if (strcmp(optarg, "ELFCLASS32") == 0)
2161 match_bits = 32;
2162 if (strcmp(optarg, "ELFCLASS64") == 0)
2163 match_bits = 64;
2164 }
2165 break;
2166 case 'O':
2167 if (sscanf(optarg, "%o", &match_perms) == -1)
2168 match_bits = 0;
1222 break; 2169 break;
1223 case 'o': { 2170 case 'o': {
1224 FILE *fp = NULL;
1225 if ((fp = freopen(optarg, "w", stdout)) == NULL) 2171 if (freopen(optarg, "w", stdout) == NULL)
1226 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 2172 errp("Could not freopen(%s)", optarg);
1227 SET_STDOUT(fp);
1228 break; 2173 break;
1229 } 2174 }
1230
1231 case 's': { 2175 case 'k':
1232 if (find_sym) warn("You prob don't want to specify -s twice"); 2176 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; 2177 break;
1237 }
1238 case 'N': { 2178 case 's':
1239 if (find_lib) warn("You prob don't want to specify -N twice"); 2179 /* historically, this was comma delimited */
1240 find_lib = optarg; 2180 parse_delimited(find_sym_arr, optarg, ",");
1241 break; 2181 break;
1242 } 2182 case 'N':
1243 2183 xarraypush_str(find_lib_arr, optarg);
2184 break;
1244 case 'F': { 2185 case 'F': {
1245 if (out_format) warn("You prob don't want to specify -F twice"); 2186 if (out_format) warn("You prob don't want to specify -F twice");
1246 out_format = optarg; 2187 out_format = optarg;
1247 break; 2188 break;
1248 } 2189 }
2190 case 'z': {
2191 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
2192 size_t x;
1249 2193
1250 case 'g': gmatch = 1; /* break; any reason we dont breal; here ? */ 2194 for (x = 0; x < strlen(optarg); x++) {
1251 case 'L': printcache = 1; break; 2195 switch (optarg[x]) {
2196 case 'p':
2197 case 'P':
2198 do_pax_state(optarg[x], PAGEEXEC);
2199 break;
2200 case 's':
2201 case 'S':
2202 do_pax_state(optarg[x], SEGMEXEC);
2203 break;
2204 case 'm':
2205 case 'M':
2206 do_pax_state(optarg[x], MPROTECT);
2207 break;
2208 case 'e':
2209 case 'E':
2210 do_pax_state(optarg[x], EMUTRAMP);
2211 break;
2212 case 'r':
2213 case 'R':
2214 do_pax_state(optarg[x], RANDMMAP);
2215 break;
2216 case 'x':
2217 case 'X':
2218 do_pax_state(optarg[x], RANDEXEC);
2219 break;
2220 default:
2221 break;
2222 }
2223 }
2224 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
2225 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
2226 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
2227 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
2228 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
2229 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
2230 setpax = flags;
2231 break;
2232 }
2233 case 'Z': show_size = 1; break;
2234 case 'g': ++g_match; break;
2235 case 'L': load_cache_config = use_ldcache = 1; break;
1252 case 'y': scan_symlink = 0; break; 2236 case 'y': scan_symlink = 0; break;
2237 case 'A': scan_archives = 1; break;
2238 case 'C': color_init(true); break;
1253 case 'B': show_banner = 0; break; 2239 case 'B': show_banner = 0; break;
1254 case 'l': scan_ldpath = 1; break; 2240 case 'l': load_cache_config = scan_ldpath = 1; break;
1255 case 'p': scan_envpath = 1; break; 2241 case 'p': scan_envpath = 1; break;
1256 case 'R': dir_recurse = 1; break; 2242 case 'R': dir_recurse = 1; break;
1257 case 'm': dir_crossmount = 0; break; 2243 case 'm': dir_crossmount = 0; break;
2244 case 'X': ++fix_elf; break;
1258 case 'x': show_pax = 1; break; 2245 case 'x': show_pax = 1; break;
1259 case 'e': show_phdr = 1; break; 2246 case 'e': show_phdr = 1; break;
1260 case 't': show_textrel = 1; break; 2247 case 't': show_textrel = 1; break;
1261 case 'r': show_rpath = 1; break; 2248 case 'r': show_rpath = 1; break;
1262 case 'n': show_needed = 1; break; 2249 case 'n': show_needed = 1; break;
1263 case 'i': show_interp = 1; break; 2250 case 'i': show_interp = 1; break;
1264 case 'b': show_bind = 1; break; 2251 case 'b': show_bind = 1; break;
1265 case 'S': show_soname = 1; break; 2252 case 'S': show_soname = 1; break;
1266 case 'T': show_textrels = 1; break; 2253 case 'T': show_textrels = 1; break;
1267 case 'q': be_quiet = 1; break; 2254 case 'q': be_quiet = min(be_quiet, 20) + 1; break;
1268 case 'v': be_verbose = (be_verbose % 20) + 1; break; 2255 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; 2256 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
1270 2257 case 'D': show_endian = 1; break;
2258 case 'I': show_osabi = 1; break;
2259 case 'Y': show_eabi = 1; break;
2260 case 128:
2261 root_fd = open(optarg, O_RDONLY|O_CLOEXEC);
2262 if (root_fd == -1)
2263 err("Could not open root: %s", optarg);
2264 break;
2265 case 129: load_cache_config = use_ldpath = 1; break;
1271 case ':': 2266 case ':':
1272 err("Option missing parameter\n"); 2267 err("Option '%c' is missing parameter", optopt);
1273 case '?': 2268 case '?':
1274 err("Unknown option\n"); 2269 err("Unknown option '%c' or argument missing", optopt);
1275 default: 2270 default:
1276 err("Unhandled option '%c'", i); 2271 err("Unhandled option '%c'; please report this", i);
1277 } 2272 }
1278 } 2273 }
2274 if (show_textrels && be_verbose)
2275 objdump = which("objdump", "OBJDUMP");
2276 /* precompile all the regexes */
2277 if (g_match) {
2278 regex_t preg;
2279 const char *this_sym;
2280 size_t n;
2281 int flags = REG_EXTENDED | REG_NOSUB | (g_match > 1 ? REG_ICASE : 0);
1279 2282
2283 array_for_each(find_sym_arr, n, this_sym) {
2284 /* see scanelf_match_symname for logic info */
2285 switch (this_sym[0]) {
2286 case '%':
2287 while (*(this_sym++))
2288 if (*this_sym == '%') {
2289 ++this_sym;
2290 break;
2291 }
2292 break;
2293 case '+':
2294 case '-':
2295 ++this_sym;
2296 break;
2297 }
2298 if (*this_sym == '*')
2299 ++this_sym;
2300
2301 ret = regcomp(&preg, this_sym, flags);
2302 if (ret) {
2303 char err[256];
2304 regerror(ret, &preg, err, sizeof(err));
2305 err("regcomp of %s failed: %s", this_sym, err);
2306 }
2307 xarraypush(find_sym_regex_arr, &preg, sizeof(preg));
2308 }
2309 }
2310 /* flatten arrays for display */
2311 find_sym = array_flatten_str(find_sym_arr);
2312 find_lib = array_flatten_str(find_lib_arr);
2313 find_section = array_flatten_str(find_section_arr);
1280 /* let the format option override all other options */ 2314 /* let the format option override all other options */
1281 if (out_format) { 2315 if (out_format) {
1282 show_pax = show_phdr = show_textrel = show_rpath = \ 2316 show_pax = show_phdr = show_textrel = show_rpath = \
1283 show_needed = show_interp = show_bind = show_soname = \ 2317 show_needed = show_interp = show_bind = show_soname = \
1284 show_textrels = 0; 2318 show_textrels = show_perms = show_endian = show_size = \
2319 show_osabi = show_eabi = 0;
1285 for (i = 0; out_format[i]; ++i) { 2320 for (i = 0; out_format[i]; ++i) {
1286 if (!IS_MODIFIER(out_format[i])) continue; 2321 if (!IS_MODIFIER(out_format[i])) continue;
1287 2322
1288 switch (out_format[++i]) { 2323 switch (out_format[++i]) {
2324 case '+': break;
1289 case '%': break; 2325 case '%': break;
1290 case '#': break; 2326 case '#': break;
1291 case 'F': break; 2327 case 'F': break;
1292 case 'p': break; 2328 case 'p': break;
1293 case 'f': break; 2329 case 'f': break;
2330 case 'k': break;
1294 case 's': break; 2331 case 's': break;
1295 case 'N': break; 2332 case 'N': break;
1296 case 'o': break; 2333 case 'o': break;
2334 case 'a': break;
2335 case 'M': break;
2336 case 'Z': show_size = 1; break;
2337 case 'D': show_endian = 1; break;
2338 case 'I': show_osabi = 1; break;
2339 case 'Y': show_eabi = 1; break;
2340 case 'O': show_perms = 1; break;
1297 case 'x': show_pax = 1; break; 2341 case 'x': show_pax = 1; break;
1298 case 'e': show_phdr = 1; break; 2342 case 'e': show_phdr = 1; break;
1299 case 't': show_textrel = 1; break; 2343 case 't': show_textrel = 1; break;
1300 case 'r': show_rpath = 1; break; 2344 case 'r': show_rpath = 1; break;
1301 case 'n': show_needed = 1; break; 2345 case 'n': show_needed = 1; break;
1302 case 'i': show_interp = 1; break; 2346 case 'i': show_interp = 1; break;
1303 case 'b': show_bind = 1; break; 2347 case 'b': show_bind = 1; break;
1304 case 'S': show_soname = 1; break; 2348 case 'S': show_soname = 1; break;
1305 case 'T': show_textrels = 1; break; 2349 case 'T': show_textrels = 1; break;
1306 default: 2350 default:
1307 err("Invalid format specifier '%c' (byte %i)", 2351 err("invalid format specifier '%c' (byte %i)",
1308 out_format[i], i+1); 2352 out_format[i], i+1);
1309 } 2353 }
1310 } 2354 }
1311 2355
1312 /* construct our default format */ 2356 /* construct our default format */
1313 } else { 2357 } else {
1314 size_t fmt_len = 30; 2358 size_t fmt_len = 30;
1315 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 2359 out_format = xmalloc(sizeof(char) * fmt_len);
2360 *out_format = '\0';
1316 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 2361 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1317 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len); 2362 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
2363 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
2364 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
2365 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
2366 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
2367 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
1318 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len); 2368 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1319 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 2369 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1320 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 2370 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1321 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 2371 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1322 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 2372 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1323 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len); 2373 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1324 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len); 2374 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1325 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len); 2375 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1326 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len); 2376 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
2377 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1327 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len); 2378 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1328 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 2379 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1329 } 2380 }
1330 if (be_verbose > 2) printf("Format: %s\n", out_format); 2381 if (be_verbose > 2) printf("Format: %s\n", out_format);
1331 2382
1332 /* now lets actually do the scanning */ 2383 /* now lets actually do the scanning */
1333 if (scan_ldpath || (show_rpath && be_quiet)) 2384 if (load_cache_config)
1334 load_ld_so_conf(); 2385 load_ld_cache_config(__PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
1335 if (scan_ldpath) scanelf_ldpath(); 2386 if (scan_ldpath) scanelf_ldpath();
1336 if (scan_envpath) scanelf_envpath(); 2387 if (scan_envpath) scanelf_envpath();
2388 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
2389 from_file = "-";
1337 if (from_file) { 2390 if (from_file) {
1338 scanelf_from_file(from_file); 2391 scanelf_from_file(from_file);
1339 free(from_file);
1340 from_file = *argv; 2392 from_file = *argv;
1341 } 2393 }
1342 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file) 2394 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1343 err("Nothing to scan !?"); 2395 err("Nothing to scan !?");
1344 while (optind < argc) { 2396 while (optind < argc) {
1345 search_path = argv[optind++]; 2397 search_path = argv[optind++];
1346 scanelf_dir(search_path); 2398 ret = scanelf_dir(search_path);
1347 } 2399 }
1348 2400
2401#ifdef __PAX_UTILS_CLEANUP
1349 /* clean up */ 2402 /* clean up */
1350 if (versioned_symname) free(versioned_symname);
1351 for (i = 0; ldpaths[i]; ++i)
1352 free(ldpaths[i]); 2403 xarrayfree(ldpaths);
2404 xarrayfree(find_sym_arr);
2405 xarrayfree(find_lib_arr);
2406 xarrayfree(find_section_arr);
2407 free(find_sym);
2408 free(find_lib);
2409 free(find_section);
2410 {
2411 size_t n;
2412 regex_t *preg;
2413 array_for_each(find_sym_regex_arr, n, preg)
2414 regfree(preg);
2415 xarrayfree(find_sym_regex_arr);
2416 }
1353 2417
1354 if (ldcache != 0) 2418 if (ldcache != 0)
1355 munmap(ldcache, ldcache_size); 2419 munmap(ldcache, ldcache_size);
1356} 2420#endif
1357 2421
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; 2422 return ret;
1366} 2423}
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 2424
1377 new_len = strlen(*dst) + strlen(src); 2425static 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{ 2426{
1392 static char my_app[2]; 2427 const char *delims = " \t\n";
1393 my_app[0] = append; 2428 char **envvals = NULL;
1394 my_app[1] = '\0'; 2429 char *env, *s;
1395 xstrcat(dst, my_app, curr_len); 2430 int nentry;
1396}
1397 2431
2432 if ((env = getenv(envvar)) == NULL)
2433 return NULL;
1398 2434
2435 env = xstrdup(env);
2436 if (env == NULL)
2437 return NULL;
2438
2439 s = strtok(env, delims);
2440 if (s == NULL) {
2441 free(env);
2442 return NULL;
2443 }
2444
2445 nentry = 0;
2446 while (s != NULL) {
2447 ++nentry;
2448 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
2449 envvals[nentry-1] = s;
2450 s = strtok(NULL, delims);
2451 }
2452 envvals[nentry] = NULL;
2453
2454 /* don't want to free(env) as it contains the memory that backs
2455 * the envvals array of strings */
2456 return envvals;
2457}
2458
2459static void parseenv(void)
2460{
2461 color_init(false);
2462 qa_textrels = get_split_env("QA_TEXTRELS");
2463 qa_execstack = get_split_env("QA_EXECSTACK");
2464 qa_wx_load = get_split_env("QA_WX_LOAD");
2465}
2466
2467#ifdef __PAX_UTILS_CLEANUP
2468static void cleanup(void)
2469{
2470 free(out_format);
2471 free(qa_textrels);
2472 free(qa_execstack);
2473 free(qa_wx_load);
2474}
2475#endif
1399 2476
1400int main(int argc, char *argv[]) 2477int main(int argc, char *argv[])
1401{ 2478{
2479 int ret;
1402 if (argc < 2) 2480 if (argc < 2)
1403 usage(EXIT_FAILURE); 2481 usage(EXIT_FAILURE);
2482 parseenv();
1404 parseargs(argc, argv); 2483 ret = parseargs(argc, argv);
1405 fclose(stdout); 2484 fclose(stdout);
1406#ifdef __BOUNDS_CHECKING_ON 2485#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()"); 2486 cleanup();
2487 warn("The calls to add/delete heap should be off:\n"
2488 "\t- 1 due to the out_buffer not being freed in scanelf_fileat()\n"
2489 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
1408#endif 2490#endif
1409 return EXIT_SUCCESS; 2491 return ret;
1410} 2492}
2493
2494/* Match filename against entries in matchlist, return TRUE
2495 * if the file is listed */
2496static int file_matches_list(const char *filename, char **matchlist)
2497{
2498 char **file;
2499 char *match;
2500 char buf[__PAX_UTILS_PATH_MAX];
2501
2502 if (matchlist == NULL)
2503 return 0;
2504
2505 for (file = matchlist; *file != NULL; file++) {
2506 if (search_path) {
2507 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2508 match = buf;
2509 } else {
2510 match = *file;
2511 }
2512 if (fnmatch(match, filename, 0) == 0)
2513 return 1;
2514 }
2515 return 0;
2516}

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