/[gentoo-projects]/pax-utils/scanelf.c
Gentoo

Diff of /pax-utils/scanelf.c

Parent Directory Parent Directory | Revision Log Revision Log | View Patch Patch

Revision 1.119 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 1.119 2006/02/05 02:25:58 solar 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 1.119 2006/02/05 02:25:58 solar 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 int scanelf_elfobj(elfobj *elf); 18static int file_matches_list(const char *filename, char **matchlist);
21static int scanelf_elf(const char *filename, int fd, size_t len);
22static int scanelf_archive(const char *filename, int fd, size_t len);
23static void scanelf_file(const char *filename);
24static void scanelf_dir(const char *path);
25static void scanelf_ldpath(void);
26static void scanelf_envpath(void);
27static void usage(int status);
28static void parseargs(int argc, char *argv[]);
29static char *xstrdup(const char *s);
30static void *xmalloc(size_t size);
31static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n);
32#define xstrcat(dst,src,curr_len) xstrncat(dst,src,curr_len,0)
33static inline void xchrcat(char **dst, const char append, size_t *curr_len);
34 19
35/* variables to control behavior */ 20/* variables to control behavior */
36static char match_etypes[126] = ""; 21static array_t _match_etypes = array_init_decl, *match_etypes = &_match_etypes;
37static char *ldpaths[256]; 22static array_t _ldpaths = array_init_decl, *ldpaths = &_ldpaths;
38static char scan_ldpath = 0; 23static char scan_ldpath = 0;
39static char scan_envpath = 0; 24static char scan_envpath = 0;
40static char scan_symlink = 1; 25static char scan_symlink = 1;
41static char scan_archives = 0; 26static char scan_archives = 0;
42static char dir_recurse = 0; 27static char dir_recurse = 0;
43static char dir_crossmount = 1; 28static char dir_crossmount = 1;
44static char show_pax = 0; 29static char show_pax = 0;
30static char show_perms = 0;
31static char show_size = 0;
45static char show_phdr = 0; 32static char show_phdr = 0;
46static char show_textrel = 0; 33static char show_textrel = 0;
47static char show_rpath = 0; 34static char show_rpath = 0;
48static char show_needed = 0; 35static char show_needed = 0;
49static char show_interp = 0; 36static char show_interp = 0;
50static char show_bind = 0; 37static char show_bind = 0;
51static char show_soname = 0; 38static char show_soname = 0;
52static char show_textrels = 0; 39static char show_textrels = 0;
53static char show_banner = 1; 40static char show_banner = 1;
41static char show_endian = 0;
42static char show_osabi = 0;
43static char show_eabi = 0;
54static char be_quiet = 0; 44static char be_quiet = 0;
55static char be_verbose = 0; 45static char be_verbose = 0;
56static char be_wewy_wewy_quiet = 0; 46static char be_wewy_wewy_quiet = 0;
57static 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;
58static 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;
59static char *out_format = NULL; 55static char *out_format = NULL;
60static char *search_path = NULL; 56static char *search_path = NULL;
61static char fix_elf = 0; 57static char fix_elf = 0;
62static char gmatch = 0; 58static char g_match = 0;
63static char use_ldcache = 0; 59static char use_ldcache = 0;
60static char use_ldpath = 0;
64 61
62static char **qa_textrels = NULL;
63static char **qa_execstack = NULL;
64static char **qa_wx_load = NULL;
65static int root_fd = AT_FDCWD;
65 66
66caddr_t ldcache = 0; 67static int match_bits = 0;
68static unsigned int match_perms = 0;
69static void *ldcache = NULL;
67size_t ldcache_size = 0; 70static size_t ldcache_size = 0;
71static unsigned long setpax = 0UL;
68 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
69/* sub-funcs for scanelf_file() */ 164/* sub-funcs for scanelf_fileat() */
70static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab) 165static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **str)
71{ 166{
72 /* 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 */
73#define GET_SYMTABS(B) \ 182#define GET_SYMTABS(B) \
74 if (elf->elf_class == ELFCLASS ## B) { \ 183 if (elf->elf_class == ELFCLASS ## B) { \
75 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \ 184 Elf ## B ## _Shdr *esymtab = symtab; \
76 /* debug sections */ \ 185 Elf ## B ## _Shdr *estrtab = strtab; \
77 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \ 186 Elf ## B ## _Shdr *edynsym = dynsym; \
78 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \ 187 Elf ## B ## _Shdr *edynstr = dynstr; \
79 /* runtime sections */ \ 188 \
80 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \ 189 if (symtab && EGET(esymtab->sh_type) == SHT_NOBITS) \
81 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \ 190 symtab = NULL; \
191 if (dynsym && EGET(edynsym->sh_type) == SHT_NOBITS) \
192 dynsym = NULL; \
82 if (symtab && dynsym) { \ 193 if (symtab && dynsym) \
83 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \ 194 *sym = (EGET(esymtab->sh_size) > EGET(edynsym->sh_size)) ? symtab : dynsym; \
84 } else { \ 195 else \
85 *sym = (void*)(symtab ? symtab : dynsym); \ 196 *sym = symtab ? symtab : dynsym; \
86 } \ 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; \
87 if (strtab && dynstr) { \ 202 if (strtab && dynstr) \
88 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \ 203 *str = (EGET(estrtab->sh_size) > EGET(edynstr->sh_size)) ? strtab : dynstr; \
89 } else { \ 204 else \
90 *tab = (void*)(strtab ? strtab : dynstr); \ 205 *str = strtab ? strtab : dynstr; \
91 } \
92 } 206 }
93 GET_SYMTABS(32) 207 GET_SYMTABS(32)
94 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)
95} 300}
301
96static char *scanelf_file_pax(elfobj *elf, char *found_pax) 302static char *scanelf_file_pax(elfobj *elf, char *found_pax)
97{ 303{
98 static char ret[7]; 304 static char ret[7];
99 unsigned long i, shown; 305 unsigned long i, shown;
100 306
109 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 315 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
110 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 316 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
111 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 317 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
112 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \ 318 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
113 continue; \ 319 continue; \
114 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))) \
115 continue; \ 325 continue; \
116 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); \
117 *found_pax = 1; \ 327 *found_pax = 1; \
118 ++shown; \ 328 ++shown; \
119 break; \ 329 break; \
120 } \ 330 } \
121 } 331 }
122 SHOW_PAX(32) 332 SHOW_PAX(32)
123 SHOW_PAX(64) 333 SHOW_PAX(64)
124 } 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 */
125 342
126 /* fall back to EI_PAX if no PT_PAX was found */ 343 /* fall back to EI_PAX if no PT_PAX was found */
127 if (!*ret) { 344 if (!*ret) {
128 static char *paxflags; 345 static char *paxflags;
129 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf)); 346 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
143static 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)
144{ 361{
145 static char ret[12]; 362 static char ret[12];
146 char *found; 363 char *found;
147 unsigned long i, shown, multi_stack, multi_relro, multi_load; 364 unsigned long i, shown, multi_stack, multi_relro, multi_load;
148 int max_pt_load;
149 365
150 if (!show_phdr) return NULL; 366 if (!show_phdr) return NULL;
151 367
152 memcpy(ret, "--- --- ---\0", 12); 368 memcpy(ret, "--- --- ---\0", 12);
153 369
154 shown = 0; 370 shown = 0;
155 multi_stack = multi_relro = multi_load = 0; 371 multi_stack = multi_relro = multi_load = 0;
156 max_pt_load = elf_max_pt_load(elf);
157 372
158#define NOTE_GNU_STACK ".note.GNU-stack" 373#define NOTE_GNU_STACK ".note.GNU-stack"
159#define SHOW_PHDR(B) \ 374#define SHOW_PHDR(B) \
160 if (elf->elf_class == ELFCLASS ## B) { \ 375 if (elf->elf_class == ELFCLASS ## B) { \
161 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 376 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
163 uint32_t flags, check_flags; \ 378 uint32_t flags, check_flags; \
164 if (elf->phdr != NULL) { \ 379 if (elf->phdr != NULL) { \
165 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 380 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
166 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \ 381 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
167 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \ 382 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
383 if (multi_stack++) \
168 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; \
169 found = found_phdr; \ 387 found = found_phdr; \
170 offset = 0; \ 388 offset = 0; \
171 check_flags = PF_X; \ 389 check_flags = PF_X; \
172 } 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++) \
173 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \ 392 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
174 found = found_relro; \ 393 found = found_relro; \
175 offset = 4; \ 394 offset = 4; \
176 check_flags = PF_X; \ 395 check_flags = PF_X; \
177 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \ 396 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
178 if (ehdr->e_type == ET_DYN || ehdr->e_type == ET_EXEC) \ 397 if (file_matches_list(elf->filename, qa_wx_load)) \
179 if (multi_load++ > max_pt_load) warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \ 398 continue; \
180 found = found_load; \ 399 found = found_load; \
181 offset = 8; \ 400 offset = 8; \
182 check_flags = PF_W|PF_X; \ 401 check_flags = PF_W|PF_X; \
183 } else \ 402 } else \
184 continue; \ 403 continue; \
185 flags = EGET(phdr[i].p_flags); \ 404 flags = EGET(phdr[i].p_flags); \
186 if (be_quiet && ((flags & check_flags) != check_flags)) \ 405 if (be_quiet && ((flags & check_flags) != check_flags)) \
187 continue; \ 406 continue; \
188 if (fix_elf && ((flags & PF_X) != flags)) { \ 407 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
189 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \ 408 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
190 ret[3] = ret[7] = '!'; \ 409 ret[3] = ret[7] = '!'; \
191 flags = EGET(phdr[i].p_flags); \ 410 flags = EGET(phdr[i].p_flags); \
192 } \ 411 } \
193 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \ 412 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
197 } else if (elf->shdr != NULL) { \ 416 } else if (elf->shdr != NULL) { \
198 /* no program headers which means this is prob an object file */ \ 417 /* no program headers which means this is prob an object file */ \
199 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \ 418 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
200 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \ 419 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
201 char *str; \ 420 char *str; \
202 if ((void*)strtbl > (void*)elf->data_end) \ 421 if ((void*)strtbl > elf->data_end) \
203 goto skip_this_shdr##B; \ 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 */ \
204 check_flags = SHF_WRITE|SHF_EXECINSTR; \ 427 check_flags = /*SHF_WRITE|*/SHF_EXECINSTR; \
205 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \ 428 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
206 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \ 429 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
207 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \ 430 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
208 str = elf->data + offset; \ 431 str = elf->data + offset; \
209 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \ 432 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
221 break; \ 444 break; \
222 } \ 445 } \
223 } \ 446 } \
224 skip_this_shdr##B: \ 447 skip_this_shdr##B: \
225 if (!multi_stack) { \ 448 if (!multi_stack) { \
449 if (file_matches_list(elf->filename, qa_execstack)) \
450 return NULL; \
226 *found_phdr = 1; \ 451 *found_phdr = 1; \
227 shown = 1; \ 452 shown = 1; \
228 memcpy(ret, "!WX", 3); \ 453 memcpy(ret, "!WX", 3); \
229 } \ 454 } \
230 } \ 455 } \
235 if (be_wewy_wewy_quiet || (be_quiet && !shown)) 460 if (be_wewy_wewy_quiet || (be_quiet && !shown))
236 return NULL; 461 return NULL;
237 else 462 else
238 return ret; 463 return ret;
239} 464}
465
466/*
467 * See if this ELF contains a DT_TEXTREL tag in any of its
468 * PT_DYNAMIC sections.
469 */
240static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 470static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
241{ 471{
242 static const char *ret = "TEXTREL"; 472 static const char *ret = "TEXTREL";
243 unsigned long i; 473 unsigned long i;
244 474
245 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;
246 478
247 if (elf->phdr) { 479 if (elf->phdr) {
248#define SHOW_TEXTREL(B) \ 480#define SHOW_TEXTREL(B) \
249 if (elf->elf_class == ELFCLASS ## B) { \ 481 if (elf->elf_class == ELFCLASS ## B) { \
250 Elf ## B ## _Dyn *dyn; \ 482 Elf ## B ## _Dyn *dyn; \
251 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 483 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
252 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 484 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
253 Elf ## B ## _Off offset; \ 485 Elf ## B ## _Off offset; \
254 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 486 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
255 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; \
256 offset = EGET(phdr[i].p_offset); \ 488 offset = EGET(phdr[i].p_offset); \
257 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 489 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
258 dyn = DYN ## B (elf->data + offset); \ 490 dyn = DYN ## B (elf->vdata + offset); \
259 while (EGET(dyn->d_tag) != DT_NULL) { \ 491 while (EGET(dyn->d_tag) != DT_NULL) { \
260 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)*/ \
261 *found_textrel = 1; \ 493 *found_textrel = 1; \
262 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \ 494 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
263 return (be_wewy_wewy_quiet ? NULL : ret); \ 495 return (be_wewy_wewy_quiet ? NULL : ret); \
272 if (be_quiet || be_wewy_wewy_quiet) 504 if (be_quiet || be_wewy_wewy_quiet)
273 return NULL; 505 return NULL;
274 else 506 else
275 return " - "; 507 return " - ";
276} 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 */
277static 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)
278{ 516{
279 unsigned long s, r, rmax; 517 unsigned long s, r, rmax;
280 void *symtab_void, *strtab_void, *text_void; 518 void *symtab_void, *strtab_void, *text_void;
281 519
302 Elf ## B ## _Rela *rela; \ 540 Elf ## B ## _Rela *rela; \
303 /* search the section headers for relocations */ \ 541 /* search the section headers for relocations */ \
304 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \ 542 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
305 uint32_t sh_type = EGET(shdr[s].sh_type); \ 543 uint32_t sh_type = EGET(shdr[s].sh_type); \
306 if (sh_type == SHT_REL) { \ 544 if (sh_type == SHT_REL) { \
307 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \ 545 rel = REL ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
308 rela = NULL; \ 546 rela = NULL; \
309 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \ 547 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
310 } else if (sh_type == SHT_RELA) { \ 548 } else if (sh_type == SHT_RELA) { \
311 rel = NULL; \ 549 rel = NULL; \
312 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \ 550 rela = RELA ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
313 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \ 551 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
314 } else \ 552 } else \
315 continue; \ 553 continue; \
316 /* now see if any of the relocs are in the .text */ \ 554 /* now see if any of the relocs are in the .text */ \
317 for (r = 0; r < rmax; ++r) { \ 555 for (r = 0; r < rmax; ++r) { \
332 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \ 570 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
333 if (be_verbose <= 2) continue; \ 571 if (be_verbose <= 2) continue; \
334 } else \ 572 } else \
335 *found_textrels = 1; \ 573 *found_textrels = 1; \
336 /* locate this relocation symbol name */ \ 574 /* locate this relocation symbol name */ \
337 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 575 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
338 if ((void*)sym > (void*)elf->data_end) { \ 576 if ((void*)sym > elf->data_end) { \
339 warn("%s: corrupt ELF symbol", elf->filename); \ 577 warn("%s: corrupt ELF symbol", elf->filename); \
340 continue; \ 578 continue; \
341 } \ 579 } \
342 sym_max = ELF ## B ## _R_SYM(r_info); \ 580 sym_max = ELF ## B ## _R_SYM(r_info); \
343 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \ 581 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
346 sym = NULL; \ 584 sym = NULL; \
347 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 585 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
348 /* show the raw details about this reloc */ \ 586 /* show the raw details about this reloc */ \
349 printf(" %s: ", elf->base_filename); \ 587 printf(" %s: ", elf->base_filename); \
350 if (sym && sym->st_name) \ 588 if (sym && sym->st_name) \
351 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)); \
352 else \ 590 else \
353 printf("(memory/fake?)"); \ 591 printf("(memory/data?)"); \
354 printf(" [0x%lX]", (unsigned long)r_offset); \ 592 printf(" [0x%lX]", (unsigned long)r_offset); \
355 /* 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 */ \
356 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 594 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
357 func = NULL; \ 595 func = NULL; \
358 offset_tmp = 0; \ 596 offset_tmp = 0; \
359 while (sym_max--) { \ 597 while (sym_max--) { \
360 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) { \
361 func = sym; \ 599 func = sym; \
362 offset_tmp = EGET(sym->st_value); \ 600 offset_tmp = EGET(sym->st_value); \
363 } \ 601 } \
364 ++sym; \ 602 ++sym; \
365 } \ 603 } \
366 printf(" in "); \ 604 printf(" in "); \
367 if (func && func->st_name) \ 605 if (func && func->st_name) { \
368 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); \
369 else \ 609 else \
370 printf("(NULL: fake?)"); \ 610 printf("%s", func_name); \
611 } else \
612 printf("(optimized out)"); \
371 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 } \
372 } \ 635 } \
373 } } 636 } }
374 SHOW_TEXTRELS(32) 637 SHOW_TEXTRELS(32)
375 SHOW_TEXTRELS(64) 638 SHOW_TEXTRELS(64)
376 } 639 }
378 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);
379 642
380 return NULL; 643 return NULL;
381} 644}
382 645
383static void rpath_security_checks(elfobj *, char *, const char *);
384static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type) 646static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
385{ 647{
386 struct stat st; 648 struct stat st;
387 switch (*item) { 649 switch (*item) {
388 case '/': break; 650 case '/': break;
394 warnf("Security problem NULL %s in %s", dt_type, elf->filename); 656 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
395 break; 657 break;
396 case '$': 658 case '$':
397 if (fstat(elf->fd, &st) != -1) 659 if (fstat(elf->fd, &st) != -1)
398 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID)) 660 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
399 warnf("Security problem with %s='%s' in %s with mode set of %o", 661 warnf("Security problem with %s='%s' in %s with mode set of %o",
400 dt_type, item, elf->filename, st.st_mode & 07777); 662 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
401 break; 663 break;
402 default: 664 default:
403 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename); 665 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
404 break; 666 break;
405 } 667 }
406} 668}
407static 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)
408{ 670{
409 unsigned long i, s; 671 unsigned long i;
410 char *rpath, *runpath, **r; 672 char *rpath, *runpath, **r;
411 void *strtbl_void; 673 void *strtbl_void;
412 674
413 if (!show_rpath) return; 675 if (!show_rpath) return;
414 676
425 Elf ## B ## _Off offset; \ 687 Elf ## B ## _Off offset; \
426 Elf ## B ## _Xword word; \ 688 Elf ## B ## _Xword word; \
427 /* Scan all the program headers */ \ 689 /* Scan all the program headers */ \
428 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 690 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
429 /* Just scan dynamic headers */ \ 691 /* Just scan dynamic headers */ \
430 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; \
431 offset = EGET(phdr[i].p_offset); \ 693 offset = EGET(phdr[i].p_offset); \
432 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 694 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
433 /* Just scan dynamic RPATH/RUNPATH headers */ \ 695 /* Just scan dynamic RPATH/RUNPATH headers */ \
434 dyn = DYN ## B (elf->data + offset); \ 696 dyn = DYN ## B (elf->vdata + offset); \
435 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \ 697 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
436 if (word == DT_RPATH) { \ 698 if (word == DT_RPATH) { \
437 r = &rpath; \ 699 r = &rpath; \
438 } else if (word == DT_RUNPATH) { \ 700 } else if (word == DT_RUNPATH) { \
439 r = &runpath; \ 701 r = &runpath; \
443 } \ 705 } \
444 /* Verify the memory is somewhat sane */ \ 706 /* Verify the memory is somewhat sane */ \
445 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 707 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
446 if (offset < (Elf ## B ## _Off)elf->len) { \ 708 if (offset < (Elf ## B ## _Off)elf->len) { \
447 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \ 709 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
448 *r = (char*)(elf->data + offset); \ 710 *r = elf->data + offset; \
449 /* cache the length in case we need to nuke this section later on */ \ 711 /* cache the length in case we need to nuke this section later on */ \
450 if (fix_elf) \ 712 if (fix_elf) \
451 offset = strlen(*r); \ 713 offset = strlen(*r); \
452 /* If quiet, don't output paths in ld.so.conf */ \ 714 /* If quiet, don't output paths in ld.so.conf */ \
453 if (be_quiet) { \ 715 if (be_quiet) { \
459 /* scan each path in : delimited list */ \ 721 /* scan each path in : delimited list */ \
460 while (start) { \ 722 while (start) { \
461 rpath_security_checks(elf, start, get_elfdtype(word)); \ 723 rpath_security_checks(elf, start, get_elfdtype(word)); \
462 end = strchr(start, ':'); \ 724 end = strchr(start, ':'); \
463 len = (end ? abs(end - start) : strlen(start)); \ 725 len = (end ? abs(end - start) : strlen(start)); \
464 if (use_ldcache) \ 726 if (use_ldcache) { \
465 for (s = 0; ldpaths[s]; ++s) \ 727 size_t n; \
728 const char *ldpath; \
729 array_for_each(ldpaths, n, ldpath) \
466 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \ 730 if (!strncmp(ldpath, start, len) && !ldpath[len]) { \
467 *r = end; \ 731 *r = end; \
468 /* corner case ... if RPATH reads "/usr/lib:", we want \ 732 /* corner case ... if RPATH reads "/usr/lib:", we want \
469 * to show ':' rather than '' */ \ 733 * to show ':' rather than '' */ \
470 if (end && end[1] != '\0') \ 734 if (end && end[1] != '\0') \
471 (*r)++; \ 735 (*r)++; \
472 break; \ 736 break; \
473 } \ 737 } \
738 } \
474 if (!*r || !end) \ 739 if (!*r || !end) \
475 break; \ 740 break; \
476 else \ 741 else \
477 start = start + len + 1; \ 742 start = start + len + 1; \
478 } \ 743 } \
544 xstrcat(ret, (runpath ? runpath : rpath), ret_len); 809 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
545 else if (!be_quiet) 810 else if (!be_quiet)
546 xstrcat(ret, " - ", ret_len); 811 xstrcat(ret, " - ", ret_len);
547} 812}
548 813
814/* Defines can be seen in glibc's sysdeps/generic/ldconfig.h */
549#define LDSO_CACHE_MAGIC "ld.so-" 815#define LDSO_CACHE_MAGIC "ld.so-"
550#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1) 816#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
551#define LDSO_CACHE_VER "1.7.0" 817#define LDSO_CACHE_VER "1.7.0"
552#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1) 818#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
553#define FLAG_ANY -1 819#define FLAG_ANY -1
562#define FLAG_X8664_LIB64 0x0300 828#define FLAG_X8664_LIB64 0x0300
563#define FLAG_S390_LIB64 0x0400 829#define FLAG_S390_LIB64 0x0400
564#define FLAG_POWERPC_LIB64 0x0500 830#define FLAG_POWERPC_LIB64 0x0500
565#define FLAG_MIPS64_LIBN32 0x0600 831#define FLAG_MIPS64_LIBN32 0x0600
566#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
567 836
568static char *lookup_cache_lib(elfobj *, char *); 837#if defined(__GLIBC__) || defined(__UCLIBC__)
838
569static char *lookup_cache_lib(elfobj *elf, char *fname) 839static char *lookup_cache_lib(elfobj *elf, const char *fname)
570{ 840{
571 int fd = 0; 841 int fd;
572 char *strs; 842 char *strs;
573 static char buf[__PAX_UTILS_PATH_MAX] = ""; 843 static char buf[__PAX_UTILS_PATH_MAX] = "";
574 const char *cachefile = "/etc/ld.so.cache"; 844 const char *cachefile = root_rel_path("/etc/ld.so.cache");
575 struct stat st; 845 struct stat st;
576 846
577 typedef struct { 847 typedef struct {
578 char magic[LDSO_CACHE_MAGIC_LEN]; 848 char magic[LDSO_CACHE_MAGIC_LEN];
579 char version[LDSO_CACHE_VER_LEN]; 849 char version[LDSO_CACHE_VER_LEN];
589 libentry_t *libent; 859 libentry_t *libent;
590 860
591 if (fname == NULL) 861 if (fname == NULL)
592 return NULL; 862 return NULL;
593 863
594 if (ldcache == 0) { 864 if (ldcache == NULL) {
595 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)
596 return NULL; 870 return NULL;
597 871
598 /* 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 */
599 ldcache_size = st.st_size; 873 ldcache_size = st.st_size;
600 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0); 874 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
601
602 close(fd); 875 close(fd);
603 876
604 if (ldcache == (caddr_t)-1) { 877 if (ldcache == MAP_FAILED) {
605 ldcache = 0; 878 ldcache = NULL;
606 return NULL; 879 return NULL;
607 } 880 }
608 881
609 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;
610 return NULL; 887 return NULL;
611 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
612 return NULL;
613 } 888 }
889 } else
890 header = ldcache;
614 891
615 header = (header_t *) ldcache;
616 libent = (libentry_t *) (ldcache + sizeof(header_t)); 892 libent = ldcache + sizeof(header_t);
617 strs = (char *) &libent[header->nlibs]; 893 strs = (char *) &libent[header->nlibs];
618 894
619 for (fd = 0; fd < header->nlibs; fd++) { 895 for (fd = 0; fd < header->nlibs; ++fd) {
620 /* 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
621 * diff arches will not be cached together. and we ignore the 897 * diff arches will not be cached together, and we ignore the
622 * the different multilib mips cases. */ 898 * the different multilib mips cases.
899 */
623 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK)) 900 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
624 continue; 901 continue;
625 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK)) 902 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
626 continue; 903 continue;
627 904
628 if (strcmp(fname, strs + libent[fd].sooffset) != 0) 905 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
629 continue; 906 continue;
907
908 /* Return first hit because that is how the ldso rolls */
630 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf)); 909 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
910 break;
631 } 911 }
912
632 return buf; 913 return buf;
633} 914}
634 915
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}
635 966
636static 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)
637{ 968{
638 unsigned long i; 969 unsigned long i;
639 char *needed; 970 char *needed;
640 void *strtbl_void; 971 void *strtbl_void;
641 char *p; 972 char *p;
642 973
974 /*
975 * -n -> op==0 -> print all
976 * -N -> op==1 -> print requested
977 */
643 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL; 978 if ((op == 0 && !show_needed) || (op == 1 && !find_lib))
979 return NULL;
644 980
645 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 981 strtbl_void = elf_findsecbyname(elf, ".dynstr");
646 982
647 if (elf->phdr && strtbl_void) { 983 if (elf->phdr && strtbl_void) {
648#define SHOW_NEEDED(B) \ 984#define SHOW_NEEDED(B) \
650 Elf ## B ## _Dyn *dyn; \ 986 Elf ## B ## _Dyn *dyn; \
651 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 987 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
652 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 988 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
653 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 989 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
654 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 */ \
655 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 993 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
656 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; \
657 offset = EGET(phdr[i].p_offset); \ 996 offset = EGET(phdr[i].p_offset); \
658 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 */ \
659 dyn = DYN ## B (elf->data + offset); \ 1000 dyn = DYN ## B (elf->vdata + offset); \
660 while (EGET(dyn->d_tag) != DT_NULL) { \ 1001 while (EGET(dyn->d_tag) != DT_NULL) { \
661 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 1002 if (EGET(dyn->d_tag) == DT_NEEDED) { \
662 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 1003 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
663 if (offset >= (Elf ## B ## _Off)elf->len) { \ 1004 if (offset >= (Elf ## B ## _Off)elf->len) { \
664 ++dyn; \ 1005 ++dyn; \
665 continue; \ 1006 continue; \
666 } \ 1007 } \
667 needed = (char*)(elf->data + offset); \ 1008 needed = elf->data + offset; \
668 if (op == 0) { \ 1009 if (op == 0) { \
1010 /* -n -> print all entries */ \
669 if (!be_wewy_wewy_quiet) { \ 1011 if (!be_wewy_wewy_quiet) { \
670 if (*found_needed) xchrcat(ret, ',', ret_len); \ 1012 if (*found_needed) xchrcat(ret, ',', ret_len); \
671 if (use_ldcache) \ 1013 if (use_ldpath) { \
1014 if ((p = lookup_config_lib(needed)) != NULL) \
1015 needed = p; \
1016 } else if (use_ldcache) { \
672 if ((p = lookup_cache_lib(elf, needed)) != NULL) \ 1017 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
673 needed = p; \ 1018 needed = p; \
1019 } \
674 xstrcat(ret, needed, ret_len); \ 1020 xstrcat(ret, needed, ret_len); \
675 } \ 1021 } \
676 *found_needed = 1; \ 1022 *found_needed = 1; \
677 } else { \ 1023 } else { \
678 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)) { \
679 *found_lib = 1; \ 1037 *found_lib = 1; \
680 return (be_wewy_wewy_quiet ? NULL : needed); \ 1038 return (be_wewy_wewy_quiet ? NULL : find_lib); \
681 } \ 1039 } \
682 } \ 1040 } \
683 } \ 1041 } \
684 ++dyn; \ 1042 ++dyn; \
685 } \ 1043 } \
707 *found_interp = 1; \ 1065 *found_interp = 1; \
708 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)); \
709 } 1067 }
710 SHOW_INTERP(32) 1068 SHOW_INTERP(32)
711 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 } \
712 } 1083 }
1084 SHOW_PT_INTERP(32)
1085 SHOW_PT_INTERP(64)
1086 }
1087
713 return NULL; 1088 return NULL;
714} 1089}
715static char *scanelf_file_bind(elfobj *elf, char *found_bind) 1090static const char *scanelf_file_bind(elfobj *elf, char *found_bind)
716{ 1091{
717 unsigned long i; 1092 unsigned long i;
718 struct stat s; 1093 struct stat s;
1094 bool dynamic = false;
719 1095
720 if (!show_bind) return NULL; 1096 if (!show_bind) return NULL;
721 if (!elf->phdr) return NULL; 1097 if (!elf->phdr) return NULL;
722 1098
723#define SHOW_BIND(B) \ 1099#define SHOW_BIND(B) \
725 Elf ## B ## _Dyn *dyn; \ 1101 Elf ## B ## _Dyn *dyn; \
726 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 1102 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
727 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 1103 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
728 Elf ## B ## _Off offset; \ 1104 Elf ## B ## _Off offset; \
729 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 1105 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
730 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; \
731 offset = EGET(phdr[i].p_offset); \ 1108 offset = EGET(phdr[i].p_offset); \
732 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 1109 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
733 dyn = DYN ## B (elf->data + offset); \ 1110 dyn = DYN ## B (elf->vdata + offset); \
734 while (EGET(dyn->d_tag) != DT_NULL) { \ 1111 while (EGET(dyn->d_tag) != DT_NULL) { \
735 if (EGET(dyn->d_tag) == DT_BIND_NOW || \ 1112 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
736 (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)) \
737 { \ 1114 { \
738 if (be_quiet) return NULL; \ 1115 if (be_quiet) return NULL; \
746 SHOW_BIND(32) 1123 SHOW_BIND(32)
747 SHOW_BIND(64) 1124 SHOW_BIND(64)
748 1125
749 if (be_wewy_wewy_quiet) return NULL; 1126 if (be_wewy_wewy_quiet) return NULL;
750 1127
1128 /* don't output anything if quiet mode and the ELF is static or not setuid */
751 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))))) {
752 return NULL; 1130 return NULL;
753 } else { 1131 } else {
754 *found_bind = 1; 1132 *found_bind = 1;
755 return (char *) "LAZY"; 1133 return dynamic ? "LAZY" : "STATIC";
756 } 1134 }
757} 1135}
758static char *scanelf_file_soname(elfobj *elf, char *found_soname) 1136static char *scanelf_file_soname(elfobj *elf, char *found_soname)
759{ 1137{
760 unsigned long i; 1138 unsigned long i;
772 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 1150 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
773 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 1151 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
774 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 1152 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
775 Elf ## B ## _Off offset; \ 1153 Elf ## B ## _Off offset; \
776 /* only look for soname in shared objects */ \ 1154 /* only look for soname in shared objects */ \
777 if (ehdr->e_type != ET_DYN) \ 1155 if (EGET(ehdr->e_type) != ET_DYN) \
778 return NULL; \ 1156 return NULL; \
779 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 1157 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
780 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; \
781 offset = EGET(phdr[i].p_offset); \ 1159 offset = EGET(phdr[i].p_offset); \
782 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 1160 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
783 dyn = DYN ## B (elf->data + offset); \ 1161 dyn = DYN ## B (elf->vdata + offset); \
784 while (EGET(dyn->d_tag) != DT_NULL) { \ 1162 while (EGET(dyn->d_tag) != DT_NULL) { \
785 if (EGET(dyn->d_tag) == DT_SONAME) { \ 1163 if (EGET(dyn->d_tag) == DT_SONAME) { \
786 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 1164 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
787 if (offset >= (Elf ## B ## _Off)elf->len) { \ 1165 if (offset >= (Elf ## B ## _Off)elf->len) { \
788 ++dyn; \ 1166 ++dyn; \
789 continue; \ 1167 continue; \
790 } \ 1168 } \
791 soname = (char*)(elf->data + offset); \ 1169 soname = elf->data + offset; \
792 *found_soname = 1; \ 1170 *found_soname = 1; \
793 return (be_wewy_wewy_quiet ? NULL : soname); \ 1171 return (be_wewy_wewy_quiet ? NULL : soname); \
794 } \ 1172 } \
795 ++dyn; \ 1173 ++dyn; \
796 } \ 1174 } \
799 SHOW_SONAME(64) 1177 SHOW_SONAME(64)
800 } 1178 }
801 1179
802 return NULL; 1180 return NULL;
803} 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
804static char *scanelf_file_sym(elfobj *elf, char *found_sym) 1335static const char *scanelf_file_sym(elfobj *elf, char *found_sym)
805{ 1336{
806 unsigned long i;
807 char *ret; 1337 char *ret;
808 void *symtab_void, *strtab_void; 1338 void *symtab_void, *strtab_void;
809 1339
810 if (!find_sym) return NULL; 1340 if (!find_sym) return NULL;
811 ret = find_sym; 1341 ret = NULL;
812 1342
813 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void); 1343 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
814 1344
815 if (symtab_void && strtab_void) { 1345 if (symtab_void && strtab_void) {
816#define FIND_SYM(B) \ 1346#define FIND_SYM(B) \
817 if (elf->elf_class == ELFCLASS ## B) { \ 1347 if (elf->elf_class == ELFCLASS ## B) { \
818 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 1348 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
819 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 1349 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
820 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)); \
821 unsigned long cnt = EGET(symtab->sh_entsize); \ 1351 Elf ## B ## _Word i, cnt = EGET(symtab->sh_entsize); \
822 char *symname; \ 1352 char *symname; \
1353 size_t ret_len = 0; \
823 if (cnt) \ 1354 if (cnt) \
824 cnt = EGET(symtab->sh_size) / cnt; \ 1355 cnt = EGET(symtab->sh_size) / cnt; \
825 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 } \
826 if (sym->st_name) { \ 1361 if (sym->st_name) { \
1362 /* make sure the symbol name is in acceptable memory range */ \
827 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 1363 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
828 if ((void*)symname > (void*)elf->data_end) { \ 1364 if ((void*)symname > elf->data_end) { \
829 warnf("%s: corrupt ELF symbols", elf->filename); \ 1365 warnf("%s: corrupt ELF symbols", elf->filename); \
1366 ++sym; \
830 continue; \ 1367 continue; \
831 } \ 1368 } \
832 if (*find_sym == '*') { \ 1369 scanelf_match_symname(elf, found_sym, \
833 printf("%s(%s) %5lX %15s %s\n", \ 1370 &ret, &ret_len, symname, \
834 ((*found_sym == 0) ? "\n\t" : "\t"), \ 1371 ELF##B##_ST_TYPE(EGET(sym->st_info)), \
835 elf->base_filename, \ 1372 ELF##B##_ST_BIND(EGET(sym->st_info)), \
836 (unsigned long)sym->st_size, \ 1373 EGET(sym->st_shndx), \
837 get_elfstttype(sym->st_info), \ 1374 /* st_size can be 64bit, but no one is really that big, so screw em */ \
838 symname); \ 1375 EGET(sym->st_size)); \
839 *found_sym = 1; \
840 } else { \
841 char *this_sym, *next_sym; \
842 this_sym = find_sym; \
843 do { \
844 next_sym = strchr(this_sym, ','); \
845 if (next_sym == NULL) \
846 next_sym = this_sym + strlen(this_sym); \
847 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
848 (strcmp(symname, versioned_symname) == 0)) { \
849 ret = this_sym; \
850 (*found_sym)++; \
851 goto break_out; \
852 } \
853 this_sym = next_sym + 1; \
854 } while (*next_sym != '\0'); \
855 } \
856 } \ 1376 } \
857 ++sym; \ 1377 ++sym; \
858 } } 1378 } \
1379 }
859 FIND_SYM(32) 1380 FIND_SYM(32)
860 FIND_SYM(64) 1381 FIND_SYM(64)
861 } 1382 }
862 1383
863break_out: 1384break_out:
866 if (*find_sym != '*' && *found_sym) 1387 if (*find_sym != '*' && *found_sym)
867 return ret; 1388 return ret;
868 if (be_quiet) 1389 if (be_quiet)
869 return NULL; 1390 return NULL;
870 else 1391 else
871 return (char *)" - "; 1392 return " - ";
872} 1393}
873 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}
874 1432
875/* scan an elf file and show all the fun stuff */ 1433/* scan an elf file and show all the fun stuff */
876#define prints(str) write(fileno(stdout), str, strlen(str)) 1434#define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
877static int scanelf_elfobj(elfobj *elf) 1435static int scanelf_elfobj(elfobj *elf)
878{ 1436{
879 unsigned long i; 1437 unsigned long i;
880 char found_pax, found_phdr, found_relro, found_load, found_textrel, 1438 char found_pax, found_phdr, found_relro, found_load, found_textrel,
881 found_rpath, found_needed, found_interp, found_bind, found_soname, 1439 found_rpath, found_needed, found_interp, found_bind, found_soname,
882 found_sym, found_lib, found_file, found_textrels; 1440 found_sym, found_lib, found_file, found_textrels, found_section;
883 static char *out_buffer = NULL; 1441 static char *out_buffer = NULL;
884 static size_t out_len; 1442 static size_t out_len;
885 1443
886 found_pax = found_phdr = found_relro = found_load = found_textrel = \ 1444 found_pax = found_phdr = found_relro = found_load = found_textrel = \
887 found_rpath = found_needed = found_interp = found_bind = found_soname = \ 1445 found_rpath = found_needed = found_interp = found_bind = found_soname = \
888 found_sym = found_lib = found_file = found_textrels = 0; 1446 found_sym = found_lib = found_file = found_textrels = found_section = 0;
889 1447
890 if (be_verbose > 2) 1448 if (be_verbose > 2)
891 printf("%s: scanning file {%s,%s}\n", elf->filename, 1449 printf("%s: scanning file {%s,%s}\n", elf->filename,
892 get_elfeitype(EI_CLASS, elf->elf_class), 1450 get_elfeitype(EI_CLASS, elf->elf_class),
893 get_elfeitype(EI_DATA, elf->data[EI_DATA])); 1451 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
895 printf("%s: scanning file\n", elf->filename); 1453 printf("%s: scanning file\n", elf->filename);
896 1454
897 /* init output buffer */ 1455 /* init output buffer */
898 if (!out_buffer) { 1456 if (!out_buffer) {
899 out_len = sizeof(char) * 80; 1457 out_len = sizeof(char) * 80;
900 out_buffer = (char*)xmalloc(out_len); 1458 out_buffer = xmalloc(out_len);
901 } 1459 }
902 *out_buffer = '\0'; 1460 *out_buffer = '\0';
903 1461
904 /* show the header */ 1462 /* show the header */
905 if (!be_quiet && show_banner) { 1463 if (!be_quiet && show_banner) {
906 for (i = 0; out_format[i]; ++i) { 1464 for (i = 0; out_format[i]; ++i) {
907 if (!IS_MODIFIER(out_format[i])) continue; 1465 if (!IS_MODIFIER(out_format[i])) continue;
908 1466
909 switch (out_format[++i]) { 1467 switch (out_format[++i]) {
1468 case '+': break;
910 case '%': break; 1469 case '%': break;
911 case '#': break; 1470 case '#': break;
912 case 'F': 1471 case 'F':
913 case 'p': 1472 case 'p':
914 case 'f': prints("FILE "); found_file = 1; break; 1473 case 'f': prints("FILE "); found_file = 1; break;
915 case 'o': prints(" TYPE "); break; 1474 case 'o': prints(" TYPE "); break;
916 case 'x': prints(" PAX "); break; 1475 case 'x': prints(" PAX "); break;
917 case 'e': prints("STK/REL/PTL "); break; 1476 case 'e': prints("STK/REL/PTL "); break;
918 case 't': prints("TEXTREL "); break; 1477 case 't': prints("TEXTREL "); break;
919 case 'r': prints("RPATH "); break; 1478 case 'r': prints("RPATH "); break;
1479 case 'M': prints("CLASS "); break;
1480 case 'l':
920 case 'n': prints("NEEDED "); break; 1481 case 'n': prints("NEEDED "); break;
921 case 'i': prints("INTERP "); break; 1482 case 'i': prints("INTERP "); break;
922 case 'b': prints("BIND "); break; 1483 case 'b': prints("BIND "); break;
1484 case 'Z': prints("SIZE "); break;
923 case 'S': prints("SONAME "); break; 1485 case 'S': prints("SONAME "); break;
924 case 's': prints("SYM "); break; 1486 case 's': prints("SYM "); break;
925 case 'N': prints("LIB "); break; 1487 case 'N': prints("LIB "); break;
926 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;
927 default: warnf("'%c' has no title ?", out_format[i]); 1495 default: warnf("'%c' has no title ?", out_format[i]);
928 } 1496 }
929 } 1497 }
930 if (!found_file) prints("FILE "); 1498 if (!found_file) prints("FILE ");
931 prints("\n"); 1499 prints("\n");
935 1503
936 /* dump all the good stuff */ 1504 /* dump all the good stuff */
937 for (i = 0; out_format[i]; ++i) { 1505 for (i = 0; out_format[i]; ++i) {
938 const char *out; 1506 const char *out;
939 const char *tmp; 1507 const char *tmp;
940 1508 static char ubuf[sizeof(unsigned long)*2];
941 /* make sure we trim leading spaces in quiet mode */
942 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
943 *out_buffer = '\0';
944
945 if (!IS_MODIFIER(out_format[i])) { 1509 if (!IS_MODIFIER(out_format[i])) {
946 xchrcat(&out_buffer, out_format[i], &out_len); 1510 xchrcat(&out_buffer, out_format[i], &out_len);
947 continue; 1511 continue;
948 } 1512 }
949 1513
950 out = NULL; 1514 out = NULL;
951 be_wewy_wewy_quiet = (out_format[i] == '#'); 1515 be_wewy_wewy_quiet = (out_format[i] == '#');
1516 be_semi_verbose = (out_format[i] == '+');
952 switch (out_format[++i]) { 1517 switch (out_format[++i]) {
1518 case '+':
953 case '%': 1519 case '%':
954 case '#': 1520 case '#':
955 xchrcat(&out_buffer, out_format[i], &out_len); break; 1521 xchrcat(&out_buffer, out_format[i], &out_len); break;
956 case 'F': 1522 case 'F':
957 found_file = 1; 1523 found_file = 1;
983 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1549 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
984 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;
985 case 't': out = scanelf_file_textrel(elf, &found_textrel); break; 1551 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
986 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;
987 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;
988 case 'n': 1557 case 'n':
989 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;
990 case 'i': out = scanelf_file_interp(elf, &found_interp); break; 1559 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
991 case 'b': out = scanelf_file_bind(elf, &found_bind); break; 1560 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
992 case 'S': out = scanelf_file_soname(elf, &found_soname); break; 1561 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
993 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;;
994 default: warnf("'%c' has no scan code?", out_format[i]); 1568 default: warnf("'%c' has no scan code?", out_format[i]);
995 } 1569 }
996 if (out) { 1570 if (out)
997 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
998 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
999 xstrncat(&out_buffer, out, &out_len, (tmp-out));
1000 else
1001 xstrcat(&out_buffer, out, &out_len); 1571 xstrcat(&out_buffer, out, &out_len);
1002 }
1003 } 1572 }
1004 1573
1005#define FOUND_SOMETHING() \ 1574#define FOUND_SOMETHING() \
1006 (found_pax || found_phdr || found_relro || found_load || found_textrel || \ 1575 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1007 found_rpath || found_needed || found_interp || found_bind || \ 1576 found_rpath || found_needed || found_interp || found_bind || \
1008 found_soname || found_sym || found_lib || found_textrels) 1577 found_soname || found_sym || found_lib || found_textrels || found_section )
1009 1578
1010 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) { 1579 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1011 xchrcat(&out_buffer, ' ', &out_len); 1580 xchrcat(&out_buffer, ' ', &out_len);
1012 xstrcat(&out_buffer, elf->filename, &out_len); 1581 xstrcat(&out_buffer, elf->filename, &out_len);
1013 } 1582 }
1020} 1589}
1021 1590
1022/* scan a single elf */ 1591/* scan a single elf */
1023static int scanelf_elf(const char *filename, int fd, size_t len) 1592static int scanelf_elf(const char *filename, int fd, size_t len)
1024{ 1593{
1025 int ret; 1594 int ret = 1;
1595 size_t n;
1596 const char *match_etype;
1026 elfobj *elf; 1597 elfobj *elf;
1027 1598
1028 /* verify this is real ELF */ 1599 /* Verify this is a real ELF */
1029 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) { 1600 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1030 if (be_verbose > 2) printf("%s: not an ELF\n", filename); 1601 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1031 return 1; 1602 return 2;
1032 }
1033
1034 if (strlen(match_etypes)) {
1035 char sbuf[126];
1036 strncpy(sbuf, match_etypes, sizeof(sbuf));
1037 if (strchr(match_etypes, ',') != NULL) {
1038 char *p;
1039 while((p = strrchr(sbuf, ',')) != NULL) {
1040 *p = 0;
1041 if (atoi(p+1) == get_etype(elf))
1042 goto label_ret;
1043 }
1044 } 1603 }
1045 if (atoi(sbuf) != get_etype(elf)) { 1604
1046 ret = 1; 1605 /* Possibly filter based on ELF bitness */
1606 switch (match_bits) {
1607 case 32:
1608 if (elf->elf_class != ELFCLASS32)
1047 goto label_done; 1609 goto done;
1610 break;
1611 case 64:
1612 if (elf->elf_class != ELFCLASS64)
1613 goto done;
1614 break;
1048 } 1615 }
1049 }
1050 1616
1051label_ret: 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:
1052 ret = scanelf_elfobj(elf); 1625 ret = scanelf_elfobj(elf);
1053 1626
1054label_done: 1627 done:
1055 unreadelf(elf); 1628 unreadelf(elf);
1056 return ret; 1629 return ret;
1057} 1630}
1058 1631
1059/* scan an archive of elfs */ 1632/* scan an archive of elfs */
1066 1639
1067 ar = ar_open_fd(filename, fd); 1640 ar = ar_open_fd(filename, fd);
1068 if (ar == NULL) 1641 if (ar == NULL)
1069 return 1; 1642 return 1;
1070 1643
1071 ar_buffer = (char*)mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0); 1644 ar_buffer = mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1072 while ((m=ar_next(ar)) != NULL) { 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");
1073 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size); 1649 elf = readelf_buffer(m->name, ar_buffer + cur_pos, m->size);
1074 if (elf) { 1650 if (elf) {
1075 scanelf_elfobj(elf); 1651 scanelf_elfobj(elf);
1076 unreadelf(elf); 1652 unreadelf(elf);
1077 } 1653 }
1078 } 1654 }
1079 munmap(ar_buffer, len); 1655 munmap(ar_buffer, len);
1080 1656
1081 return 0; 1657 return 0;
1082} 1658}
1083/* scan a file which may be an elf or an archive or some other magical beast */ 1659/* scan a file which may be an elf or an archive or some other magical beast */
1084static void scanelf_file(const char *filename) 1660static int scanelf_fileat(int dir_fd, const char *filename, const struct stat *st_cache)
1085{ 1661{
1662 const struct stat *st = st_cache;
1086 struct stat st; 1663 struct stat symlink_st;
1087 int fd; 1664 int fd;
1088 1665
1089 /* make sure 'filename' exists */
1090 if (lstat(filename, &st) == -1) {
1091 if (be_verbose > 2) printf("%s: does not exist\n", filename);
1092 return;
1093 }
1094
1095 /* always handle regular files and handle symlinked files if no -y */ 1666 /* always handle regular files and handle symlinked files if no -y */
1096 if (S_ISLNK(st.st_mode)) { 1667 if (S_ISLNK(st->st_mode)) {
1097 if (!scan_symlink) return; 1668 if (!scan_symlink)
1098 stat(filename, &st); 1669 return 1;
1670 fstatat(dir_fd, filename, &symlink_st, 0);
1671 st = &symlink_st;
1099 } 1672 }
1673
1100 if (!S_ISREG(st.st_mode)) { 1674 if (!S_ISREG(st->st_mode)) {
1101 if (be_verbose > 2) printf("%s: skipping non-file\n", filename); 1675 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1102 return; 1676 return 1;
1103 } 1677 }
1104 1678
1105 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1) 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));
1106 return; 1689 return 1;
1690 }
1107 1691
1108 if (scanelf_elf(filename, fd, st.st_size) == 1 && scan_archives) 1692 if (scanelf_elf(filename, fd, st->st_size) == 2) {
1109 /* if it isn't an ELF, maybe it's an .a archive */ 1693 /* if it isn't an ELF, maybe it's an .a archive */
1694 if (scan_archives)
1110 scanelf_archive(filename, fd, st.st_size); 1695 scanelf_archive(filename, fd, st->st_size);
1111 1696
1697 /*
1698 * unreadelf() implicitly closes its fd, so only close it
1699 * when we are returning it in the non-ELF case
1700 */
1112 close(fd); 1701 close(fd);
1702 }
1703
1704 return 0;
1113} 1705}
1114 1706
1115/* 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 */
1116static void scanelf_dir(const char *path) 1708static int scanelf_dirat(int dir_fd, const char *path)
1117{ 1709{
1118 register DIR *dir; 1710 register DIR *dir;
1119 register struct dirent *dentry; 1711 register struct dirent *dentry;
1120 struct stat st_top, st; 1712 struct stat st_top, st;
1121 char buf[__PAX_UTILS_PATH_MAX]; 1713 char buf[__PAX_UTILS_PATH_MAX], *subpath;
1122 size_t pathlen = 0, len = 0; 1714 size_t pathlen = 0, len = 0;
1715 int ret = 0;
1716 int subdir_fd;
1123 1717
1124 /* make sure path exists */ 1718 /* make sure path exists */
1125 if (lstat(path, &st_top) == -1) { 1719 if (fstatat(dir_fd, path, &st_top, AT_SYMLINK_NOFOLLOW) == -1) {
1126 if (be_verbose > 2) printf("%s: does not exist\n", path); 1720 if (be_verbose > 2) printf("%s: does not exist\n", path);
1127 return; 1721 return 1;
1128 } 1722 }
1129 1723
1130 /* 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 */
1131 if (!S_ISDIR(st_top.st_mode)) { 1725 if (!S_ISDIR(st_top.st_mode))
1132 scanelf_file(path); 1726 return scanelf_fileat(dir_fd, path, &st_top);
1133 return;
1134 }
1135 1727
1136 /* now scan the dir looking for fun stuff */ 1728 /* now scan the dir looking for fun stuff */
1137 if ((dir = opendir(path)) == NULL) { 1729 subdir_fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
1138 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));
1139 return; 1739 return 1;
1140 } 1740 }
1141 if (be_verbose > 1) printf("%s: scanning dir\n", path); 1741 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1142 1742
1143 pathlen = strlen(path); 1743 subpath = stpcpy(buf, path);
1744 if (subpath[-1] != '/')
1745 *subpath++ = '/';
1746 pathlen = subpath - buf;
1144 while ((dentry = readdir(dir))) { 1747 while ((dentry = readdir(dir))) {
1145 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1748 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1146 continue; 1749 continue;
1750
1751 if (fstatat(subdir_fd, dentry->d_name, &st, AT_SYMLINK_NOFOLLOW) == -1)
1752 continue;
1753
1147 len = (pathlen + 1 + strlen(dentry->d_name) + 1); 1754 len = strlen(dentry->d_name);
1148 if (len >= sizeof(buf)) { 1755 if (len + pathlen + 1 >= sizeof(buf)) {
1149 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path, 1756 warnf("Skipping '%s%s': len > sizeof(buf); %zu > %zu\n",
1150 (unsigned long)len, (unsigned long)sizeof(buf)); 1757 path, dentry->d_name, len + pathlen + 1, sizeof(buf));
1151 continue; 1758 continue;
1152 } 1759 }
1153 sprintf(buf, "%s/%s", path, dentry->d_name); 1760 memcpy(subpath, dentry->d_name, len);
1154 if (lstat(buf, &st) != -1) { 1761 subpath[len] = '\0';
1762
1155 if (S_ISREG(st.st_mode)) 1763 if (S_ISREG(st.st_mode))
1156 scanelf_file(buf); 1764 ret = scanelf_fileat(dir_fd, buf, &st);
1157 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1765 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1158 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1766 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1159 scanelf_dir(buf); 1767 ret = scanelf_dirat(dir_fd, buf);
1160 }
1161 } 1768 }
1162 } 1769 }
1163 closedir(dir); 1770 closedir(dir);
1164}
1165 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
1166static int scanelf_from_file(char *filename) 1779static int scanelf_from_file(const char *filename)
1167{ 1780{
1168 FILE *fp = NULL; 1781 FILE *fp;
1169 char *p; 1782 char *p, *path;
1170 char path[__PAX_UTILS_PATH_MAX]; 1783 size_t len;
1784 int ret;
1171 1785
1172 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL)) 1786 if (strcmp(filename, "-") == 0)
1173 fp = stdin; 1787 fp = stdin;
1174 else if ((fp = fopen(filename, "r")) == NULL) 1788 else if ((fp = fopen(filename, "r")) == NULL)
1175 return 1; 1789 return 1;
1176 1790
1177 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) { 1791 path = NULL;
1792 len = 0;
1793 ret = 0;
1794 while (getline(&path, &len, fp) != -1) {
1178 if ((p = strchr(path, '\n')) != NULL) 1795 if ((p = strchr(path, '\n')) != NULL)
1179 *p = 0; 1796 *p = 0;
1180 search_path = path; 1797 search_path = path;
1181 scanelf_dir(path); 1798 ret = scanelf_dir(path);
1182 } 1799 }
1800 free(path);
1801
1183 if (fp != stdin) 1802 if (fp != stdin)
1184 fclose(fp); 1803 fclose(fp);
1804
1185 return 0; 1805 return ret;
1186} 1806}
1187 1807
1188static void load_ld_so_conf() 1808#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1809
1810static int _load_ld_cache_config(const char *fname)
1189{ 1811{
1190 FILE *fp = NULL; 1812 FILE *fp = NULL;
1191 char *p; 1813 char *p, *path;
1192 char path[__PAX_UTILS_PATH_MAX]; 1814 size_t len;
1193 int i = 0; 1815 int curr_fd = -1;
1194 1816
1195 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1817 fp = fopenat_r(root_fd, root_rel_path(fname));
1818 if (fp == NULL)
1196 return; 1819 return -1;
1197 1820
1198 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) { 1821 path = NULL;
1199 if (*path != '/') 1822 len = 0;
1200 continue; 1823 while (getline(&path, &len, fp) != -1) {
1201
1202 if ((p = strrchr(path, '\r')) != NULL) 1824 if ((p = strrchr(path, '\r')) != NULL)
1203 *p = 0; 1825 *p = 0;
1204 if ((p = strchr(path, '\n')) != NULL) 1826 if ((p = strchr(path, '\n')) != NULL)
1205 *p = 0; 1827 *p = 0;
1206 1828
1207 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;
1208 1834
1209 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths)) 1835 /* re-use existing path buffer ... need to be creative */
1210 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;
1211 } 1861 }
1212 ldpaths[i] = NULL; 1862
1863 if (*path != '/')
1864 continue;
1865
1866 xarraypush_str(ldpaths, path);
1867 }
1868 free(path);
1213 1869
1214 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");
1215} 1947}
1216 1948
1217/* scan /etc/ld.so.conf for paths */ 1949/* scan /etc/ld.so.conf for paths */
1218static void scanelf_ldpath() 1950static void scanelf_ldpath(void)
1219{ 1951{
1220 char scan_l, scan_ul, scan_ull; 1952 size_t n;
1221 int i = 0; 1953 const char *ldpath;
1222 1954
1223 if (!ldpaths[0]) 1955 array_for_each(ldpaths, n, ldpath)
1224 err("Unable to load any paths from ld.so.conf");
1225
1226 scan_l = scan_ul = scan_ull = 0;
1227
1228 while (ldpaths[i]) {
1229 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
1230 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
1231 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
1232 scanelf_dir(ldpaths[i]); 1956 scanelf_dir(ldpath);
1233 ++i;
1234 }
1235
1236 if (!scan_l) scanelf_dir("/lib");
1237 if (!scan_ul) scanelf_dir("/usr/lib");
1238 if (!scan_ull) scanelf_dir("/usr/local/lib");
1239} 1957}
1240 1958
1241/* scan env PATH for paths */ 1959/* scan env PATH for paths */
1242static void scanelf_envpath() 1960static void scanelf_envpath(void)
1243{ 1961{
1244 char *path, *p; 1962 char *path, *p;
1245 1963
1246 path = getenv("PATH"); 1964 path = getenv("PATH");
1247 if (!path) 1965 if (!path)
1254 } 1972 }
1255 1973
1256 free(path); 1974 free(path);
1257} 1975}
1258 1976
1259 1977/* usage / invocation handling functions */ /* Free Flags: c d j u w G H J K P Q U W */
1260/* usage / invocation handling functions */
1261#define PARSE_FLAGS "plRmyAXxetrnLibSs:gN:TaqvF:f:o:E:BhV" 1978#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZCBhV"
1262#define a_argument required_argument 1979#define a_argument required_argument
1263static struct option const long_opts[] = { 1980static struct option const long_opts[] = {
1264 {"path", no_argument, NULL, 'p'}, 1981 {"path", no_argument, NULL, 'p'},
1265 {"ldpath", no_argument, NULL, 'l'}, 1982 {"ldpath", no_argument, NULL, 'l'},
1983 {"use-ldpath",no_argument, NULL, 129},
1984 {"root", a_argument, NULL, 128},
1266 {"recursive", no_argument, NULL, 'R'}, 1985 {"recursive", no_argument, NULL, 'R'},
1267 {"mount", no_argument, NULL, 'm'}, 1986 {"mount", no_argument, NULL, 'm'},
1268 {"symlink", no_argument, NULL, 'y'}, 1987 {"symlink", no_argument, NULL, 'y'},
1269 {"archives", no_argument, NULL, 'A'}, 1988 {"archives", no_argument, NULL, 'A'},
1270 {"ldcache", no_argument, NULL, 'L'}, 1989 {"ldcache", no_argument, NULL, 'L'},
1271 {"fix", no_argument, NULL, 'X'}, 1990 {"fix", no_argument, NULL, 'X'},
1991 {"setpax", a_argument, NULL, 'z'},
1272 {"pax", no_argument, NULL, 'x'}, 1992 {"pax", no_argument, NULL, 'x'},
1273 {"header", no_argument, NULL, 'e'}, 1993 {"header", no_argument, NULL, 'e'},
1274 {"textrel", no_argument, NULL, 't'}, 1994 {"textrel", no_argument, NULL, 't'},
1275 {"rpath", no_argument, NULL, 'r'}, 1995 {"rpath", no_argument, NULL, 'r'},
1276 {"needed", no_argument, NULL, 'n'}, 1996 {"needed", no_argument, NULL, 'n'},
1277 {"interp", no_argument, NULL, 'i'}, 1997 {"interp", no_argument, NULL, 'i'},
1278 {"bind", no_argument, NULL, 'b'}, 1998 {"bind", no_argument, NULL, 'b'},
1279 {"soname", no_argument, NULL, 'S'}, 1999 {"soname", no_argument, NULL, 'S'},
1280 {"symbol", a_argument, NULL, 's'}, 2000 {"symbol", a_argument, NULL, 's'},
2001 {"section", a_argument, NULL, 'k'},
1281 {"lib", a_argument, NULL, 'N'}, 2002 {"lib", a_argument, NULL, 'N'},
1282 {"gmatch", no_argument, NULL, 'g'}, 2003 {"gmatch", no_argument, NULL, 'g'},
1283 {"textrels", no_argument, NULL, 'T'}, 2004 {"textrels", no_argument, NULL, 'T'},
1284 {"etype", a_argument, NULL, 'E'}, 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'},
1285 {"all", no_argument, NULL, 'a'}, 2012 {"all", no_argument, NULL, 'a'},
1286 {"quiet", no_argument, NULL, 'q'}, 2013 {"quiet", no_argument, NULL, 'q'},
1287 {"verbose", no_argument, NULL, 'v'}, 2014 {"verbose", no_argument, NULL, 'v'},
1288 {"format", a_argument, NULL, 'F'}, 2015 {"format", a_argument, NULL, 'F'},
1289 {"from", a_argument, NULL, 'f'}, 2016 {"from", a_argument, NULL, 'f'},
1290 {"file", a_argument, NULL, 'o'}, 2017 {"file", a_argument, NULL, 'o'},
2018 {"nocolor", no_argument, NULL, 'C'},
1291 {"nobanner", no_argument, NULL, 'B'}, 2019 {"nobanner", no_argument, NULL, 'B'},
1292 {"help", no_argument, NULL, 'h'}, 2020 {"help", no_argument, NULL, 'h'},
1293 {"version", no_argument, NULL, 'V'}, 2021 {"version", no_argument, NULL, 'V'},
1294 {NULL, no_argument, NULL, 0x0} 2022 {NULL, no_argument, NULL, 0x0}
1295}; 2023};
1296 2024
1297static const char *opts_help[] = { 2025static const char * const opts_help[] = {
1298 "Scan all directories in PATH environment", 2026 "Scan all directories in PATH environment",
1299 "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)",
1300 "Scan directories recursively", 2030 "Scan directories recursively",
1301 "Don't recursively cross mount points", 2031 "Don't recursively cross mount points",
1302 "Don't scan symlinks", 2032 "Don't scan symlinks",
1303 "Scan archives (.a files)", 2033 "Scan archives (.a files)",
1304 "Utilize ld.so.cache information (use with -r/-n)", 2034 "Utilize ld.so.cache to show full path (use with -r/-n)",
1305 "Try and 'fix' bad things (use with -r/-e)\n", 2035 "Try and 'fix' bad things (use with -r/-e)",
2036 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1306 "Print PaX markings", 2037 "Print PaX markings",
1307 "Print GNU_STACK/PT_LOAD markings", 2038 "Print GNU_STACK/PT_LOAD markings",
1308 "Print TEXTREL information", 2039 "Print TEXTREL information",
1309 "Print RPATH information", 2040 "Print RPATH information",
1310 "Print NEEDED information", 2041 "Print NEEDED information",
1311 "Print INTERP information", 2042 "Print INTERP information",
1312 "Print BIND information", 2043 "Print BIND information",
1313 "Print SONAME information", 2044 "Print SONAME information",
1314 "Find a specified symbol", 2045 "Find a specified symbol",
2046 "Find a specified section",
1315 "Find a specified library", 2047 "Find a specified library",
1316 "Use strncmp to match libraries. (use with -N)", 2048 "Use regex rather than string compare (with -s); specify twice for case insensitive",
1317 "Locate cause of TEXTREL", 2049 "Locate cause of TEXTREL",
2050 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1318 "Print only ELF files matching numeric constant", 2051 "Print only ELF files matching numeric bits",
1319 "Print all scanned info (-x -e -t -r -b)\n", 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",
1320 "Only output 'bad' things", 2058 "Only output 'bad' things",
1321 "Be verbose (can be specified more than once)", 2059 "Be verbose (can be specified more than once)",
1322 "Use specified format for output", 2060 "Use specified format for output",
1323 "Read input stream from a filename", 2061 "Read input stream from a filename",
1324 "Write output stream to a filename", 2062 "Write output stream to a filename",
2063 "Don't emit color in output",
1325 "Don't display the header", 2064 "Don't display the header",
1326 "Print this help and exit", 2065 "Print this help and exit",
1327 "Print version and exit", 2066 "Print version and exit",
1328 NULL 2067 NULL
1329}; 2068};
1330 2069
1331/* display usage and exit */ 2070/* display usage and exit */
1332static void usage(int status) 2071static void usage(int status)
1333{ 2072{
1334 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;
1335 printf("* Scan ELF binaries for stuff\n\n" 2077 printf("* Scan ELF binaries for stuff\n\n"
1336 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0); 2078 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1337 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;
1338 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 */
1339 if (long_opts[i].has_arg == no_argument) 2098 if (long_opts[i].has_arg == no_argument)
1340 printf(" -%c, --%-13s* %s\n", long_opts[i].val, 2099 printf("--%-*s", optlen, long_opts[i].name);
1341 long_opts[i].name, opts_help[i]);
1342 else 2100 else
1343 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val, 2101 printf("--%s %s %*s", long_opts[i].name, a_arg,
1344 long_opts[i].name, opts_help[i]); 2102 (int)(optlen - strlen(long_opts[i].name) - a_arg_len), "");
1345 2103
1346 if (status != EXIT_SUCCESS) 2104 /* finally the help text */
1347 exit(status); 2105 printf("* %s\n", opts_help[i]);
2106 }
1348 2107
1349 puts("\nThe format modifiers for the -F option are:"); 2108 puts("\nFor more information, see the scanelf(1) manpage");
1350 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1351 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1352 puts(" i INTERP \tb BIND \ts symbol");
1353 puts(" N library \to Type \tT TEXTRELs");
1354 puts(" S SONAME");
1355 puts(" p filename (with search path removed)");
1356 puts(" f filename (short name/basename)");
1357 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1358
1359 exit(status); 2109 exit(status);
1360} 2110}
1361 2111
1362/* 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}
1363static void parseargs(int argc, char *argv[]) 2131static int parseargs(int argc, char *argv[])
1364{ 2132{
1365 int i; 2133 int i;
1366 char *from_file = NULL; 2134 const char *from_file = NULL;
2135 int ret = 0;
2136 char load_cache_config = 0;
1367 2137
1368 opterr = 0; 2138 opterr = 0;
1369 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) {
1370 switch (i) { 2140 switch (i) {
1371 2141
1379 case 'f': 2149 case 'f':
1380 if (from_file) warn("You prob don't want to specify -f twice"); 2150 if (from_file) warn("You prob don't want to specify -f twice");
1381 from_file = optarg; 2151 from_file = optarg;
1382 break; 2152 break;
1383 case 'E': 2153 case 'E':
1384 strncpy(match_etypes, optarg, sizeof(match_etypes)); 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;
1385 break; 2169 break;
1386 case 'o': { 2170 case 'o': {
1387 FILE *fp = NULL;
1388 if ((fp = freopen(optarg, "w", stdout)) == NULL) 2171 if (freopen(optarg, "w", stdout) == NULL)
1389 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 2172 errp("Could not freopen(%s)", optarg);
1390 SET_STDOUT(fp);
1391 break; 2173 break;
1392 } 2174 }
1393
1394 case 's': { 2175 case 'k':
1395 if (find_sym) warn("You prob don't want to specify -s twice"); 2176 xarraypush_str(find_section_arr, optarg);
1396 find_sym = optarg;
1397 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1398 sprintf(versioned_symname, "%s@", find_sym);
1399 break; 2177 break;
1400 }
1401 case 'N': { 2178 case 's':
1402 if (find_lib) warn("You prob don't want to specify -N twice"); 2179 /* historically, this was comma delimited */
1403 find_lib = optarg; 2180 parse_delimited(find_sym_arr, optarg, ",");
1404 break; 2181 break;
1405 } 2182 case 'N':
1406 2183 xarraypush_str(find_lib_arr, optarg);
2184 break;
1407 case 'F': { 2185 case 'F': {
1408 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");
1409 out_format = optarg; 2187 out_format = optarg;
1410 break; 2188 break;
1411 } 2189 }
2190 case 'z': {
2191 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
2192 size_t x;
1412 2193
1413 case 'g': gmatch = 1; /* break; any reason we dont breal; here ? */ 2194 for (x = 0; x < strlen(optarg); x++) {
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;
1414 case 'L': use_ldcache = 1; break; 2235 case 'L': load_cache_config = use_ldcache = 1; break;
1415 case 'y': scan_symlink = 0; break; 2236 case 'y': scan_symlink = 0; break;
1416 case 'A': scan_archives = 1; break; 2237 case 'A': scan_archives = 1; break;
2238 case 'C': color_init(true); break;
1417 case 'B': show_banner = 0; break; 2239 case 'B': show_banner = 0; break;
1418 case 'l': scan_ldpath = 1; break; 2240 case 'l': load_cache_config = scan_ldpath = 1; break;
1419 case 'p': scan_envpath = 1; break; 2241 case 'p': scan_envpath = 1; break;
1420 case 'R': dir_recurse = 1; break; 2242 case 'R': dir_recurse = 1; break;
1421 case 'm': dir_crossmount = 0; break; 2243 case 'm': dir_crossmount = 0; break;
1422 case 'X': ++fix_elf; break; 2244 case 'X': ++fix_elf; break;
1423 case 'x': show_pax = 1; break; 2245 case 'x': show_pax = 1; break;
1427 case 'n': show_needed = 1; break; 2249 case 'n': show_needed = 1; break;
1428 case 'i': show_interp = 1; break; 2250 case 'i': show_interp = 1; break;
1429 case 'b': show_bind = 1; break; 2251 case 'b': show_bind = 1; break;
1430 case 'S': show_soname = 1; break; 2252 case 'S': show_soname = 1; break;
1431 case 'T': show_textrels = 1; break; 2253 case 'T': show_textrels = 1; break;
1432 case 'q': be_quiet = 1; break; 2254 case 'q': be_quiet = min(be_quiet, 20) + 1; break;
1433 case 'v': be_verbose = (be_verbose % 20) + 1; break; 2255 case 'v': be_verbose = min(be_verbose, 20) + 1; break;
1434 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;
1435 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;
1436 case ':': 2266 case ':':
1437 err("Option '%c' is missing parameter", optopt); 2267 err("Option '%c' is missing parameter", optopt);
1438 case '?': 2268 case '?':
1439 err("Unknown option '%c' or argument missing", optopt); 2269 err("Unknown option '%c' or argument missing", optopt);
1440 default: 2270 default:
1441 err("Unhandled option '%c'; please report this", i); 2271 err("Unhandled option '%c'; please report this", i);
1442 } 2272 }
1443 } 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);
1444 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);
1445 /* let the format option override all other options */ 2314 /* let the format option override all other options */
1446 if (out_format) { 2315 if (out_format) {
1447 show_pax = show_phdr = show_textrel = show_rpath = \ 2316 show_pax = show_phdr = show_textrel = show_rpath = \
1448 show_needed = show_interp = show_bind = show_soname = \ 2317 show_needed = show_interp = show_bind = show_soname = \
1449 show_textrels = 0; 2318 show_textrels = show_perms = show_endian = show_size = \
2319 show_osabi = show_eabi = 0;
1450 for (i = 0; out_format[i]; ++i) { 2320 for (i = 0; out_format[i]; ++i) {
1451 if (!IS_MODIFIER(out_format[i])) continue; 2321 if (!IS_MODIFIER(out_format[i])) continue;
1452 2322
1453 switch (out_format[++i]) { 2323 switch (out_format[++i]) {
2324 case '+': break;
1454 case '%': break; 2325 case '%': break;
1455 case '#': break; 2326 case '#': break;
1456 case 'F': break; 2327 case 'F': break;
1457 case 'p': break; 2328 case 'p': break;
1458 case 'f': break; 2329 case 'f': break;
2330 case 'k': break;
1459 case 's': break; 2331 case 's': break;
1460 case 'N': break; 2332 case 'N': break;
1461 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;
1462 case 'x': show_pax = 1; break; 2341 case 'x': show_pax = 1; break;
1463 case 'e': show_phdr = 1; break; 2342 case 'e': show_phdr = 1; break;
1464 case 't': show_textrel = 1; break; 2343 case 't': show_textrel = 1; break;
1465 case 'r': show_rpath = 1; break; 2344 case 'r': show_rpath = 1; break;
1466 case 'n': show_needed = 1; break; 2345 case 'n': show_needed = 1; break;
1467 case 'i': show_interp = 1; break; 2346 case 'i': show_interp = 1; break;
1468 case 'b': show_bind = 1; break; 2347 case 'b': show_bind = 1; break;
1469 case 'S': show_soname = 1; break; 2348 case 'S': show_soname = 1; break;
1470 case 'T': show_textrels = 1; break; 2349 case 'T': show_textrels = 1; break;
1471 default: 2350 default:
1472 err("Invalid format specifier '%c' (byte %i)", 2351 err("invalid format specifier '%c' (byte %i)",
1473 out_format[i], i+1); 2352 out_format[i], i+1);
1474 } 2353 }
1475 } 2354 }
1476 2355
1477 /* construct our default format */ 2356 /* construct our default format */
1478 } else { 2357 } else {
1479 size_t fmt_len = 30; 2358 size_t fmt_len = 30;
1480 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 2359 out_format = xmalloc(sizeof(char) * fmt_len);
2360 *out_format = '\0';
1481 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 2361 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1482 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);
1483 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len); 2368 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1484 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 2369 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1485 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 2370 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1486 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 2371 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1487 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 2372 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1488 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len); 2373 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1489 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len); 2374 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1490 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len); 2375 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1491 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);
1492 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len); 2378 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1493 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 2379 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1494 } 2380 }
1495 if (be_verbose > 2) printf("Format: %s\n", out_format); 2381 if (be_verbose > 2) printf("Format: %s\n", out_format);
1496 2382
1497 /* now lets actually do the scanning */ 2383 /* now lets actually do the scanning */
1498 if (scan_ldpath || use_ldcache) 2384 if (load_cache_config)
1499 load_ld_so_conf(); 2385 load_ld_cache_config(__PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
1500 if (scan_ldpath) scanelf_ldpath(); 2386 if (scan_ldpath) scanelf_ldpath();
1501 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 = "-";
1502 if (from_file) { 2390 if (from_file) {
1503 scanelf_from_file(from_file); 2391 scanelf_from_file(from_file);
1504 from_file = *argv; 2392 from_file = *argv;
1505 } 2393 }
1506 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file) 2394 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1507 err("Nothing to scan !?"); 2395 err("Nothing to scan !?");
1508 while (optind < argc) { 2396 while (optind < argc) {
1509 search_path = argv[optind++]; 2397 search_path = argv[optind++];
1510 scanelf_dir(search_path); 2398 ret = scanelf_dir(search_path);
1511 } 2399 }
1512 2400
2401#ifdef __PAX_UTILS_CLEANUP
1513 /* clean up */ 2402 /* clean up */
1514 if (versioned_symname) free(versioned_symname);
1515 for (i = 0; ldpaths[i]; ++i)
1516 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 }
1517 2417
1518 if (ldcache != 0) 2418 if (ldcache != 0)
1519 munmap(ldcache, ldcache_size); 2419 munmap(ldcache, ldcache_size);
1520} 2420#endif
1521 2421
1522
1523
1524/* utility funcs */
1525static char *xstrdup(const char *s)
1526{
1527 char *ret = strdup(s);
1528 if (!ret) err("Could not strdup(): %s", strerror(errno));
1529 return ret; 2422 return ret;
1530} 2423}
1531static void *xmalloc(size_t size)
1532{
1533 void *ret = malloc(size);
1534 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1535 return ret;
1536}
1537static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
1538{
1539 size_t new_len;
1540 2424
1541 new_len = strlen(*dst) + strlen(src); 2425static char **get_split_env(const char *envvar)
1542 if (*curr_len <= new_len) {
1543 *curr_len = new_len + (*curr_len / 2);
1544 *dst = realloc(*dst, *curr_len);
1545 if (!*dst)
1546 err("could not realloc() %li bytes", (unsigned long)*curr_len);
1547 }
1548
1549 if (n)
1550 strncat(*dst, src, n);
1551 else
1552 strcat(*dst, src);
1553}
1554static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1555{ 2426{
1556 static char my_app[2]; 2427 const char *delims = " \t\n";
1557 my_app[0] = append; 2428 char **envvals = NULL;
1558 my_app[1] = '\0'; 2429 char *env, *s;
1559 xstrcat(dst, my_app, curr_len); 2430 int nentry;
1560}
1561 2431
2432 if ((env = getenv(envvar)) == NULL)
2433 return NULL;
1562 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
1563 2476
1564int main(int argc, char *argv[]) 2477int main(int argc, char *argv[])
1565{ 2478{
2479 int ret;
1566 if (argc < 2) 2480 if (argc < 2)
1567 usage(EXIT_FAILURE); 2481 usage(EXIT_FAILURE);
2482 parseenv();
1568 parseargs(argc, argv); 2483 ret = parseargs(argc, argv);
1569 fclose(stdout); 2484 fclose(stdout);
1570#ifdef __BOUNDS_CHECKING_ON 2485#ifdef __PAX_UTILS_CLEANUP
1571 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");
1572#endif 2490#endif
1573 return EXIT_SUCCESS; 2491 return ret;
1574} 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}

Legend:
Removed from v.1.119  
changed lines
  Added in v.1.265

  ViewVC Help
Powered by ViewVC 1.1.20