/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.119 Revision 1.269
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 1.269 2014/11/20 01:25:56 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 1.269 2014/11/20 01:25:56 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 *
182 * We need to make sure the debug/runtime sym/str sets are used together
183 * as they are generated in sync. Trying to mix them won't work.
184 */
73#define GET_SYMTABS(B) \ 185#define GET_SYMTABS(B) \
74 if (elf->elf_class == ELFCLASS ## B) { \ 186 if (elf->elf_class == ELFCLASS ## B) { \
75 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \ 187 Elf ## B ## _Shdr *esymtab = symtab; \
76 /* debug sections */ \ 188 Elf ## B ## _Shdr *estrtab = strtab; \
77 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \ 189 Elf ## B ## _Shdr *edynsym = dynsym; \
78 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \ 190 Elf ## B ## _Shdr *edynstr = dynstr; \
79 /* runtime sections */ \ 191 \
80 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \ 192 if (symtab && EGET(esymtab->sh_type) == SHT_NOBITS) \
81 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \ 193 symtab = NULL; \
82 if (symtab && dynsym) { \ 194 if (dynsym && EGET(edynsym->sh_type) == SHT_NOBITS) \
83 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \ 195 dynsym = NULL; \
196 if (strtab && EGET(estrtab->sh_type) == SHT_NOBITS) \
197 strtab = NULL; \
198 if (dynstr && EGET(edynstr->sh_type) == SHT_NOBITS) \
199 dynstr = NULL; \
200 \
201 /* Use the set with more symbols if both exist. */ \
202 if (symtab && dynsym && strtab && dynstr) { \
203 if (EGET(esymtab->sh_size) > EGET(edynsym->sh_size)) \
204 goto debug##B; \
205 else \
206 goto runtime##B; \
207 } else if (symtab && strtab) { \
208 debug##B: \
209 *sym = symtab; \
210 *str = strtab; \
211 return; \
212 } else if (dynsym && dynstr) { \
213 runtime##B: \
214 *sym = dynsym; \
215 *str = dynstr; \
216 return; \
84 } else { \ 217 } else { \
85 *sym = (void*)(symtab ? symtab : dynsym); \ 218 *sym = *str = NULL; \
86 } \ 219 } \
87 if (strtab && dynstr) { \
88 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \
89 } else { \
90 *tab = (void*)(strtab ? strtab : dynstr); \
91 } \
92 } 220 }
93 GET_SYMTABS(32) 221 GET_SYMTABS(32)
94 GET_SYMTABS(64) 222 GET_SYMTABS(64)
223
224 if (*sym && *str)
225 return;
226
227 /*
228 * damn, they're really going to make us work for it huh?
229 * reconstruct the section header info out of the dynamic
230 * tags so we can see what symbols this guy uses at runtime.
231 */
232#define GET_SYMTABS_DT(B) \
233 if (elf->elf_class == ELFCLASS ## B) { \
234 size_t i; \
235 static Elf ## B ## _Shdr sym_shdr, str_shdr; \
236 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
237 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
238 Elf ## B ## _Addr vsym, vstr, vhash, vgnu_hash; \
239 Elf ## B ## _Dyn *dyn; \
240 Elf ## B ## _Off offset; \
241 \
242 /* lookup symbols used at runtime with DT_SYMTAB / DT_STRTAB */ \
243 vsym = vstr = vhash = vgnu_hash = 0; \
244 memset(&sym_shdr, 0, sizeof(sym_shdr)); \
245 memset(&str_shdr, 0, sizeof(str_shdr)); \
246 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
247 if (EGET(phdr[i].p_type) != PT_DYNAMIC) \
248 continue; \
249 \
250 offset = EGET(phdr[i].p_offset); \
251 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
252 continue; \
253 \
254 dyn = DYN ## B (elf->vdata + offset); \
255 while (EGET(dyn->d_tag) != DT_NULL) { \
256 switch (EGET(dyn->d_tag)) { \
257 case DT_SYMTAB: vsym = EGET(dyn->d_un.d_val); break; \
258 case DT_SYMENT: sym_shdr.sh_entsize = dyn->d_un.d_val; break; \
259 case DT_STRTAB: vstr = EGET(dyn->d_un.d_val); break; \
260 case DT_STRSZ: str_shdr.sh_size = dyn->d_un.d_val; break; \
261 case DT_HASH: vhash = EGET(dyn->d_un.d_val); break; \
262 /*case DT_GNU_HASH: vgnu_hash = EGET(dyn->d_un.d_val); break;*/ \
263 } \
264 ++dyn; \
265 } \
266 if (vsym && vstr) \
267 break; \
268 } \
269 if (!vsym || !vstr || !(vhash || vgnu_hash)) \
270 return; \
271 \
272 /* calc offset into the ELF by finding the load addr of the syms */ \
273 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
274 Elf ## B ## _Addr vaddr = EGET(phdr[i].p_vaddr); \
275 Elf ## B ## _Addr filesz = EGET(phdr[i].p_filesz); \
276 offset = EGET(phdr[i].p_offset); \
277 \
278 if (EGET(phdr[i].p_type) != PT_LOAD) \
279 continue; \
280 \
281 if (vhash >= vaddr && vhash < vaddr + filesz) { \
282 /* Scan the hash table to see how many entries we have */ \
283 Elf32_Word max_sym_idx = 0; \
284 Elf32_Word *hashtbl = elf->vdata + offset + (vhash - vaddr); \
285 Elf32_Word b, nbuckets = EGET(hashtbl[0]); \
286 Elf32_Word nchains = EGET(hashtbl[1]); \
287 Elf32_Word *buckets = &hashtbl[2]; \
288 Elf32_Word *chains = &buckets[nbuckets]; \
289 Elf32_Word sym_idx; \
290 \
291 for (b = 0; b < nbuckets; ++b) { \
292 if (!buckets[b]) \
293 continue; \
294 for (sym_idx = buckets[b]; sym_idx < nchains && sym_idx; sym_idx = chains[sym_idx]) \
295 if (max_sym_idx < sym_idx) \
296 max_sym_idx = sym_idx; \
297 } \
298 ESET(sym_shdr.sh_size, sym_shdr.sh_entsize * max_sym_idx); \
299 } \
300 \
301 if (vsym >= vaddr && vsym < vaddr + filesz) { \
302 ESET(sym_shdr.sh_offset, offset + (vsym - vaddr)); \
303 *sym = &sym_shdr; \
304 } \
305 \
306 if (vstr >= vaddr && vstr < vaddr + filesz) { \
307 ESET(str_shdr.sh_offset, offset + (vstr - vaddr)); \
308 *str = &str_shdr; \
309 } \
310 } \
311 }
312 GET_SYMTABS_DT(32)
313 GET_SYMTABS_DT(64)
95} 314}
315
96static char *scanelf_file_pax(elfobj *elf, char *found_pax) 316static char *scanelf_file_pax(elfobj *elf, char *found_pax)
97{ 317{
98 static char ret[7]; 318 static char ret[7];
99 unsigned long i, shown; 319 unsigned long i, shown;
100 320
109 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 329 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
110 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 330 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
111 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 331 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
112 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \ 332 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
113 continue; \ 333 continue; \
114 if (be_quiet && (EGET(phdr[i].p_flags) == 10240)) \ 334 if (fix_elf && setpax) { \
335 /* set the paxctl flags */ \
336 ESET(phdr[i].p_flags, setpax); \
337 } \
338 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
115 continue; \ 339 continue; \
116 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \ 340 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
117 *found_pax = 1; \ 341 *found_pax = 1; \
118 ++shown; \ 342 ++shown; \
119 break; \ 343 break; \
120 } \ 344 } \
121 } 345 }
122 SHOW_PAX(32) 346 SHOW_PAX(32)
123 SHOW_PAX(64) 347 SHOW_PAX(64)
124 } 348 }
349
350 /* Note: We do not support setting EI_PAX if not PT_PAX_FLAGS
351 * was found. This is known to break ELFs on glibc systems,
352 * and mainline PaX has deprecated use of this for a long time.
353 * We could support changing PT_GNU_STACK, but that doesn't
354 * seem like it's worth the effort. #411919
355 */
125 356
126 /* fall back to EI_PAX if no PT_PAX was found */ 357 /* fall back to EI_PAX if no PT_PAX was found */
127 if (!*ret) { 358 if (!*ret) {
128 static char *paxflags; 359 static char *paxflags;
129 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf)); 360 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) 374static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
144{ 375{
145 static char ret[12]; 376 static char ret[12];
146 char *found; 377 char *found;
147 unsigned long i, shown, multi_stack, multi_relro, multi_load; 378 unsigned long i, shown, multi_stack, multi_relro, multi_load;
148 int max_pt_load;
149 379
150 if (!show_phdr) return NULL; 380 if (!show_phdr) return NULL;
151 381
152 memcpy(ret, "--- --- ---\0", 12); 382 memcpy(ret, "--- --- ---\0", 12);
153 383
154 shown = 0; 384 shown = 0;
155 multi_stack = multi_relro = multi_load = 0; 385 multi_stack = multi_relro = multi_load = 0;
156 max_pt_load = elf_max_pt_load(elf);
157 386
158#define NOTE_GNU_STACK ".note.GNU-stack" 387#define NOTE_GNU_STACK ".note.GNU-stack"
159#define SHOW_PHDR(B) \ 388#define SHOW_PHDR(B) \
160 if (elf->elf_class == ELFCLASS ## B) { \ 389 if (elf->elf_class == ELFCLASS ## B) { \
161 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 390 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
163 uint32_t flags, check_flags; \ 392 uint32_t flags, check_flags; \
164 if (elf->phdr != NULL) { \ 393 if (elf->phdr != NULL) { \
165 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 394 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
166 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \ 395 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
167 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \ 396 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
397 if (multi_stack++) \
168 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \ 398 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
399 if (file_matches_list(elf->filename, qa_execstack)) \
400 continue; \
169 found = found_phdr; \ 401 found = found_phdr; \
170 offset = 0; \ 402 offset = 0; \
171 check_flags = PF_X; \ 403 check_flags = PF_X; \
172 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \ 404 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
405 if (multi_relro++) \
173 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \ 406 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
174 found = found_relro; \ 407 found = found_relro; \
175 offset = 4; \ 408 offset = 4; \
176 check_flags = PF_X; \ 409 check_flags = PF_X; \
177 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \ 410 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
178 if (ehdr->e_type == ET_DYN || ehdr->e_type == ET_EXEC) \ 411 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); \ 412 continue; \
180 found = found_load; \ 413 found = found_load; \
181 offset = 8; \ 414 offset = 8; \
182 check_flags = PF_W|PF_X; \ 415 check_flags = PF_W|PF_X; \
183 } else \ 416 } else \
184 continue; \ 417 continue; \
185 flags = EGET(phdr[i].p_flags); \ 418 flags = EGET(phdr[i].p_flags); \
186 if (be_quiet && ((flags & check_flags) != check_flags)) \ 419 if (be_quiet && ((flags & check_flags) != check_flags)) \
187 continue; \ 420 continue; \
188 if (fix_elf && ((flags & PF_X) != flags)) { \ 421 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)); \ 422 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
190 ret[3] = ret[7] = '!'; \ 423 ret[3] = ret[7] = '!'; \
191 flags = EGET(phdr[i].p_flags); \ 424 flags = EGET(phdr[i].p_flags); \
192 } \ 425 } \
193 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \ 426 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
197 } else if (elf->shdr != NULL) { \ 430 } else if (elf->shdr != NULL) { \
198 /* no program headers which means this is prob an object file */ \ 431 /* no program headers which means this is prob an object file */ \
199 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \ 432 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
200 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \ 433 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
201 char *str; \ 434 char *str; \
202 if ((void*)strtbl > (void*)elf->data_end) \ 435 if ((void*)strtbl > elf->data_end) \
203 goto skip_this_shdr##B; \ 436 goto skip_this_shdr##B; \
437 /* let's flag -w/+x object files since the final ELF will most likely \
438 * need write access to the stack (who doesn't !?). so the combined \
439 * output will bring in +w automatically and that's bad. \
440 */ \
204 check_flags = SHF_WRITE|SHF_EXECINSTR; \ 441 check_flags = /*SHF_WRITE|*/SHF_EXECINSTR; \
205 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \ 442 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
206 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \ 443 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
207 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \ 444 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
208 str = elf->data + offset; \ 445 str = elf->data + offset; \
209 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \ 446 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
221 break; \ 458 break; \
222 } \ 459 } \
223 } \ 460 } \
224 skip_this_shdr##B: \ 461 skip_this_shdr##B: \
225 if (!multi_stack) { \ 462 if (!multi_stack) { \
463 if (file_matches_list(elf->filename, qa_execstack)) \
464 return NULL; \
226 *found_phdr = 1; \ 465 *found_phdr = 1; \
227 shown = 1; \ 466 shown = 1; \
228 memcpy(ret, "!WX", 3); \ 467 memcpy(ret, "!WX", 3); \
229 } \ 468 } \
230 } \ 469 } \
235 if (be_wewy_wewy_quiet || (be_quiet && !shown)) 474 if (be_wewy_wewy_quiet || (be_quiet && !shown))
236 return NULL; 475 return NULL;
237 else 476 else
238 return ret; 477 return ret;
239} 478}
479
480/*
481 * See if this ELF contains a DT_TEXTREL tag in any of its
482 * PT_DYNAMIC sections.
483 */
240static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 484static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
241{ 485{
242 static const char *ret = "TEXTREL"; 486 static const char *ret = "TEXTREL";
243 unsigned long i; 487 unsigned long i;
244 488
245 if (!show_textrel && !show_textrels) return NULL; 489 if (!show_textrel && !show_textrels) return NULL;
490
491 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
246 492
247 if (elf->phdr) { 493 if (elf->phdr) {
248#define SHOW_TEXTREL(B) \ 494#define SHOW_TEXTREL(B) \
249 if (elf->elf_class == ELFCLASS ## B) { \ 495 if (elf->elf_class == ELFCLASS ## B) { \
250 Elf ## B ## _Dyn *dyn; \ 496 Elf ## B ## _Dyn *dyn; \
251 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 497 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
252 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 498 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
253 Elf ## B ## _Off offset; \ 499 Elf ## B ## _Off offset; \
254 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 500 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
255 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 501 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
256 offset = EGET(phdr[i].p_offset); \ 502 offset = EGET(phdr[i].p_offset); \
257 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 503 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
258 dyn = DYN ## B (elf->data + offset); \ 504 dyn = DYN ## B (elf->vdata + offset); \
259 while (EGET(dyn->d_tag) != DT_NULL) { \ 505 while (EGET(dyn->d_tag) != DT_NULL) { \
260 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \ 506 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
261 *found_textrel = 1; \ 507 *found_textrel = 1; \
262 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \ 508 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
263 return (be_wewy_wewy_quiet ? NULL : ret); \ 509 return (be_wewy_wewy_quiet ? NULL : ret); \
272 if (be_quiet || be_wewy_wewy_quiet) 518 if (be_quiet || be_wewy_wewy_quiet)
273 return NULL; 519 return NULL;
274 else 520 else
275 return " - "; 521 return " - ";
276} 522}
523
524/*
525 * Scan the .text section to see if there are any relocations in it.
526 * Should rewrite this to check PT_LOAD sections that are marked
527 * Executable rather than the section named '.text'.
528 */
277static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel) 529static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
278{ 530{
279 unsigned long s, r, rmax; 531 unsigned long s, r, rmax;
280 void *symtab_void, *strtab_void, *text_void; 532 void *symtab_void, *strtab_void, *text_void;
281 533
302 Elf ## B ## _Rela *rela; \ 554 Elf ## B ## _Rela *rela; \
303 /* search the section headers for relocations */ \ 555 /* search the section headers for relocations */ \
304 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \ 556 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
305 uint32_t sh_type = EGET(shdr[s].sh_type); \ 557 uint32_t sh_type = EGET(shdr[s].sh_type); \
306 if (sh_type == SHT_REL) { \ 558 if (sh_type == SHT_REL) { \
307 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \ 559 rel = REL ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
308 rela = NULL; \ 560 rela = NULL; \
309 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \ 561 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
310 } else if (sh_type == SHT_RELA) { \ 562 } else if (sh_type == SHT_RELA) { \
311 rel = NULL; \ 563 rel = NULL; \
312 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \ 564 rela = RELA ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
313 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \ 565 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
314 } else \ 566 } else \
315 continue; \ 567 continue; \
316 /* now see if any of the relocs are in the .text */ \ 568 /* now see if any of the relocs are in the .text */ \
317 for (r = 0; r < rmax; ++r) { \ 569 for (r = 0; r < rmax; ++r) { \
332 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \ 584 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
333 if (be_verbose <= 2) continue; \ 585 if (be_verbose <= 2) continue; \
334 } else \ 586 } else \
335 *found_textrels = 1; \ 587 *found_textrels = 1; \
336 /* locate this relocation symbol name */ \ 588 /* locate this relocation symbol name */ \
337 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 589 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
338 if ((void*)sym > (void*)elf->data_end) { \ 590 if ((void*)sym > elf->data_end) { \
339 warn("%s: corrupt ELF symbol", elf->filename); \ 591 warn("%s: corrupt ELF symbol", elf->filename); \
340 continue; \ 592 continue; \
341 } \ 593 } \
342 sym_max = ELF ## B ## _R_SYM(r_info); \ 594 sym_max = ELF ## B ## _R_SYM(r_info); \
343 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \ 595 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
346 sym = NULL; \ 598 sym = NULL; \
347 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 599 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
348 /* show the raw details about this reloc */ \ 600 /* show the raw details about this reloc */ \
349 printf(" %s: ", elf->base_filename); \ 601 printf(" %s: ", elf->base_filename); \
350 if (sym && sym->st_name) \ 602 if (sym && sym->st_name) \
351 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \ 603 printf("%s", elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
352 else \ 604 else \
353 printf("(memory/fake?)"); \ 605 printf("(memory/data?)"); \
354 printf(" [0x%lX]", (unsigned long)r_offset); \ 606 printf(" [0x%lX]", (unsigned long)r_offset); \
355 /* now try to find the closest symbol that this rel is probably in */ \ 607 /* now try to find the closest symbol that this rel is probably in */ \
356 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 608 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
357 func = NULL; \ 609 func = NULL; \
358 offset_tmp = 0; \ 610 offset_tmp = 0; \
359 while (sym_max--) { \ 611 while (sym_max--) { \
360 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \ 612 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
361 func = sym; \ 613 func = sym; \
362 offset_tmp = EGET(sym->st_value); \ 614 offset_tmp = EGET(sym->st_value); \
363 } \ 615 } \
364 ++sym; \ 616 ++sym; \
365 } \ 617 } \
366 printf(" in "); \ 618 printf(" in "); \
367 if (func && func->st_name) \ 619 if (func && func->st_name) { \
368 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \ 620 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
621 if (r_offset > EGET(func->st_size)) \
622 printf("(optimized out: previous %s)", func_name); \
369 else \ 623 else \
370 printf("(NULL: fake?)"); \ 624 printf("%s", func_name); \
625 } else \
626 printf("(optimized out)"); \
371 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \ 627 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
628 if (be_verbose && objdump) { \
629 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
630 char *sysbuf; \
631 size_t syslen; \
632 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"; \
633 syslen = sizeof(sysfmt) + strlen(objdump) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
634 sysbuf = xmalloc(syslen); \
635 if (end_addr < r_offset) \
636 /* not uncommon when things are optimized out */ \
637 end_addr = r_offset + 0x100; \
638 snprintf(sysbuf, syslen, sysfmt, \
639 objdump, \
640 (unsigned long)offset_tmp, \
641 (unsigned long)end_addr, \
642 elf->filename, \
643 (unsigned long)r_offset); \
644 fflush(stdout); \
645 if (system(sysbuf)) {/* don't care */} \
646 fflush(stdout); \
647 free(sysbuf); \
648 } \
372 } \ 649 } \
373 } } 650 } }
374 SHOW_TEXTRELS(32) 651 SHOW_TEXTRELS(32)
375 SHOW_TEXTRELS(64) 652 SHOW_TEXTRELS(64)
376 } 653 }
378 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename); 655 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
379 656
380 return NULL; 657 return NULL;
381} 658}
382 659
383static void rpath_security_checks(elfobj *, char *, const char *);
384static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type) 660static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
385{ 661{
386 struct stat st; 662 struct stat st;
387 switch (*item) { 663 switch (*item) {
388 case '/': break; 664 case '/': break;
394 warnf("Security problem NULL %s in %s", dt_type, elf->filename); 670 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
395 break; 671 break;
396 case '$': 672 case '$':
397 if (fstat(elf->fd, &st) != -1) 673 if (fstat(elf->fd, &st) != -1)
398 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID)) 674 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", 675 warnf("Security problem with %s='%s' in %s with mode set of %o",
400 dt_type, item, elf->filename, st.st_mode & 07777); 676 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
401 break; 677 break;
402 default: 678 default:
403 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename); 679 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
404 break; 680 break;
405 } 681 }
682 if (fix_elf)
683 warnf("Note: RPATH has been automatically fixed, but this should be fixed in the package itself");
406} 684}
407static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len) 685static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
408{ 686{
409 unsigned long i, s; 687 unsigned long i;
410 char *rpath, *runpath, **r; 688 char *rpath, *runpath, **r;
411 void *strtbl_void; 689 void *strtbl_void;
412 690
413 if (!show_rpath) return; 691 if (!show_rpath) return;
414 692
425 Elf ## B ## _Off offset; \ 703 Elf ## B ## _Off offset; \
426 Elf ## B ## _Xword word; \ 704 Elf ## B ## _Xword word; \
427 /* Scan all the program headers */ \ 705 /* Scan all the program headers */ \
428 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 706 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
429 /* Just scan dynamic headers */ \ 707 /* Just scan dynamic headers */ \
430 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 708 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
431 offset = EGET(phdr[i].p_offset); \ 709 offset = EGET(phdr[i].p_offset); \
432 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 710 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
433 /* Just scan dynamic RPATH/RUNPATH headers */ \ 711 /* Just scan dynamic RPATH/RUNPATH headers */ \
434 dyn = DYN ## B (elf->data + offset); \ 712 dyn = DYN ## B (elf->vdata + offset); \
435 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \ 713 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
436 if (word == DT_RPATH) { \ 714 if (word == DT_RPATH) { \
437 r = &rpath; \ 715 r = &rpath; \
438 } else if (word == DT_RUNPATH) { \ 716 } else if (word == DT_RUNPATH) { \
439 r = &runpath; \ 717 r = &runpath; \
443 } \ 721 } \
444 /* Verify the memory is somewhat sane */ \ 722 /* Verify the memory is somewhat sane */ \
445 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 723 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
446 if (offset < (Elf ## B ## _Off)elf->len) { \ 724 if (offset < (Elf ## B ## _Off)elf->len) { \
447 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \ 725 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
448 *r = (char*)(elf->data + offset); \ 726 *r = elf->data + offset; \
449 /* cache the length in case we need to nuke this section later on */ \ 727 /* cache the length in case we need to nuke this section later on */ \
450 if (fix_elf) \ 728 if (fix_elf) \
451 offset = strlen(*r); \ 729 offset = strlen(*r); \
452 /* If quiet, don't output paths in ld.so.conf */ \ 730 /* If quiet, don't output paths in ld.so.conf */ \
453 if (be_quiet) { \ 731 if (be_quiet) { \
459 /* scan each path in : delimited list */ \ 737 /* scan each path in : delimited list */ \
460 while (start) { \ 738 while (start) { \
461 rpath_security_checks(elf, start, get_elfdtype(word)); \ 739 rpath_security_checks(elf, start, get_elfdtype(word)); \
462 end = strchr(start, ':'); \ 740 end = strchr(start, ':'); \
463 len = (end ? abs(end - start) : strlen(start)); \ 741 len = (end ? abs(end - start) : strlen(start)); \
464 if (use_ldcache) \ 742 if (use_ldcache) { \
465 for (s = 0; ldpaths[s]; ++s) \ 743 size_t n; \
744 const char *ldpath; \
745 array_for_each(ldpaths, n, ldpath) \
466 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \ 746 if (!strncmp(ldpath, start, len) && !ldpath[len]) { \
467 *r = end; \ 747 *r = end; \
468 /* corner case ... if RPATH reads "/usr/lib:", we want \ 748 /* corner case ... if RPATH reads "/usr/lib:", we want \
469 * to show ':' rather than '' */ \ 749 * to show ':' rather than '' */ \
470 if (end && end[1] != '\0') \ 750 if (end && end[1] != '\0') \
471 (*r)++; \ 751 (*r)++; \
472 break; \ 752 break; \
473 } \ 753 } \
754 } \
474 if (!*r || !end) \ 755 if (!*r || !end) \
475 break; \ 756 break; \
476 else \ 757 else \
477 start = start + len + 1; \ 758 start = start + len + 1; \
478 } \ 759 } \
544 xstrcat(ret, (runpath ? runpath : rpath), ret_len); 825 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
545 else if (!be_quiet) 826 else if (!be_quiet)
546 xstrcat(ret, " - ", ret_len); 827 xstrcat(ret, " - ", ret_len);
547} 828}
548 829
830/* Defines can be seen in glibc's sysdeps/generic/ldconfig.h */
549#define LDSO_CACHE_MAGIC "ld.so-" 831#define LDSO_CACHE_MAGIC "ld.so-"
550#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1) 832#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
551#define LDSO_CACHE_VER "1.7.0" 833#define LDSO_CACHE_VER "1.7.0"
552#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1) 834#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
553#define FLAG_ANY -1 835#define FLAG_ANY -1
562#define FLAG_X8664_LIB64 0x0300 844#define FLAG_X8664_LIB64 0x0300
563#define FLAG_S390_LIB64 0x0400 845#define FLAG_S390_LIB64 0x0400
564#define FLAG_POWERPC_LIB64 0x0500 846#define FLAG_POWERPC_LIB64 0x0500
565#define FLAG_MIPS64_LIBN32 0x0600 847#define FLAG_MIPS64_LIBN32 0x0600
566#define FLAG_MIPS64_LIBN64 0x0700 848#define FLAG_MIPS64_LIBN64 0x0700
849#define FLAG_X8664_LIBX32 0x0800
850#define FLAG_ARM_LIBHF 0x0900
851#define FLAG_AARCH64_LIB64 0x0a00
567 852
568static char *lookup_cache_lib(elfobj *, char *); 853#if defined(__GLIBC__) || defined(__UCLIBC__)
854
569static char *lookup_cache_lib(elfobj *elf, char *fname) 855static char *lookup_cache_lib(elfobj *elf, const char *fname)
570{ 856{
571 int fd = 0; 857 int fd;
572 char *strs; 858 char *strs;
573 static char buf[__PAX_UTILS_PATH_MAX] = ""; 859 static char buf[__PAX_UTILS_PATH_MAX] = "";
574 const char *cachefile = "/etc/ld.so.cache"; 860 const char *cachefile = root_rel_path("/etc/ld.so.cache");
575 struct stat st; 861 struct stat st;
576 862
577 typedef struct { 863 typedef struct {
578 char magic[LDSO_CACHE_MAGIC_LEN]; 864 char magic[LDSO_CACHE_MAGIC_LEN];
579 char version[LDSO_CACHE_VER_LEN]; 865 char version[LDSO_CACHE_VER_LEN];
589 libentry_t *libent; 875 libentry_t *libent;
590 876
591 if (fname == NULL) 877 if (fname == NULL)
592 return NULL; 878 return NULL;
593 879
594 if (ldcache == 0) { 880 if (ldcache == NULL) {
595 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1) 881 if (fstatat(root_fd, cachefile, &st, 0))
882 return NULL;
883
884 fd = openat(root_fd, cachefile, O_RDONLY);
885 if (fd == -1)
596 return NULL; 886 return NULL;
597 887
598 /* cache these values so we only map/unmap the cache file once */ 888 /* cache these values so we only map/unmap the cache file once */
599 ldcache_size = st.st_size; 889 ldcache_size = st.st_size;
600 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0); 890 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
601
602 close(fd); 891 close(fd);
603 892
604 if (ldcache == (caddr_t)-1) { 893 if (ldcache == MAP_FAILED) {
605 ldcache = 0; 894 ldcache = NULL;
606 return NULL; 895 return NULL;
607 } 896 }
608 897
609 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN)) 898 if (memcmp(header->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN) ||
899 memcmp(header->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
900 {
901 munmap(ldcache, ldcache_size);
902 ldcache = NULL;
610 return NULL; 903 return NULL;
611 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
612 return NULL;
613 } 904 }
905 } else
906 header = ldcache;
614 907
615 header = (header_t *) ldcache;
616 libent = (libentry_t *) (ldcache + sizeof(header_t)); 908 libent = ldcache + sizeof(header_t);
617 strs = (char *) &libent[header->nlibs]; 909 strs = (char *) &libent[header->nlibs];
618 910
619 for (fd = 0; fd < header->nlibs; fd++) { 911 for (fd = 0; fd < header->nlibs; ++fd) {
620 /* this should be more fine grained, but for now we assume that 912 /* This should be more fine grained, but for now we assume that
621 * diff arches will not be cached together. and we ignore the 913 * diff arches will not be cached together, and we ignore the
622 * the different multilib mips cases. */ 914 * the different multilib mips cases.
915 */
623 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK)) 916 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
624 continue; 917 continue;
625 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK)) 918 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
626 continue; 919 continue;
627 920
628 if (strcmp(fname, strs + libent[fd].sooffset) != 0) 921 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
629 continue; 922 continue;
923
924 /* Return first hit because that is how the ldso rolls */
630 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf)); 925 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
926 break;
631 } 927 }
928
632 return buf; 929 return buf;
633} 930}
634 931
932#elif defined(__NetBSD__)
933static char *lookup_cache_lib(elfobj *elf, const char *fname)
934{
935 static char buf[__PAX_UTILS_PATH_MAX] = "";
936 static struct stat st;
937 size_t n;
938 char *ldpath;
939
940 array_for_each(ldpath, n, ldpath) {
941 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", ldpath, fname) >= sizeof(buf))
942 continue; /* if the pathname is too long, or something went wrong, ignore */
943
944 if (stat(buf, &st) != 0)
945 continue; /* if the lib doesn't exist in *ldpath, look further */
946
947 /* NetBSD doesn't actually do sanity checks, it just loads the file
948 * and if that doesn't work, continues looking in other directories.
949 * This cannot easily be safely emulated, unfortunately. For now,
950 * just assume that if it exists, it's a valid library. */
951
952 return buf;
953 }
954
955 /* not found in any path */
956 return NULL;
957}
958#else
959#ifdef __ELF__
960#warning Cache support not implemented for your target
961#endif
962static char *lookup_cache_lib(elfobj *elf, const char *fname)
963{
964 return NULL;
965}
966#endif
967
968static char *lookup_config_lib(const char *fname)
969{
970 static char buf[__PAX_UTILS_PATH_MAX] = "";
971 const char *ldpath;
972 size_t n;
973
974 array_for_each(ldpaths, n, ldpath) {
975 snprintf(buf, sizeof(buf), "%s/%s", root_rel_path(ldpath), fname);
976 if (faccessat(root_fd, buf, F_OK, AT_SYMLINK_NOFOLLOW) == 0)
977 return buf;
978 }
979
980 return NULL;
981}
635 982
636static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len) 983static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
637{ 984{
638 unsigned long i; 985 unsigned long i;
639 char *needed; 986 char *needed;
640 void *strtbl_void; 987 void *strtbl_void;
641 char *p; 988 char *p;
642 989
990 /*
991 * -n -> op==0 -> print all
992 * -N -> op==1 -> print requested
993 */
643 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL; 994 if ((op == 0 && !show_needed) || (op == 1 && !find_lib))
995 return NULL;
644 996
645 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 997 strtbl_void = elf_findsecbyname(elf, ".dynstr");
646 998
647 if (elf->phdr && strtbl_void) { 999 if (elf->phdr && strtbl_void) {
648#define SHOW_NEEDED(B) \ 1000#define SHOW_NEEDED(B) \
650 Elf ## B ## _Dyn *dyn; \ 1002 Elf ## B ## _Dyn *dyn; \
651 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 1003 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
652 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 1004 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
653 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 1005 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
654 Elf ## B ## _Off offset; \ 1006 Elf ## B ## _Off offset; \
1007 size_t matched = 0; \
1008 /* Walk all the program headers to find the PT_DYNAMIC */ \
655 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 1009 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
656 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 1010 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) \
1011 continue; \
657 offset = EGET(phdr[i].p_offset); \ 1012 offset = EGET(phdr[i].p_offset); \
658 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 1013 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
1014 continue; \
1015 /* Walk all the dynamic tags to find NEEDED entries */ \
659 dyn = DYN ## B (elf->data + offset); \ 1016 dyn = DYN ## B (elf->vdata + offset); \
660 while (EGET(dyn->d_tag) != DT_NULL) { \ 1017 while (EGET(dyn->d_tag) != DT_NULL) { \
661 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 1018 if (EGET(dyn->d_tag) == DT_NEEDED) { \
662 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 1019 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
663 if (offset >= (Elf ## B ## _Off)elf->len) { \ 1020 if (offset >= (Elf ## B ## _Off)elf->len) { \
664 ++dyn; \ 1021 ++dyn; \
665 continue; \ 1022 continue; \
666 } \ 1023 } \
667 needed = (char*)(elf->data + offset); \ 1024 needed = elf->data + offset; \
668 if (op == 0) { \ 1025 if (op == 0) { \
1026 /* -n -> print all entries */ \
669 if (!be_wewy_wewy_quiet) { \ 1027 if (!be_wewy_wewy_quiet) { \
670 if (*found_needed) xchrcat(ret, ',', ret_len); \ 1028 if (*found_needed) xchrcat(ret, ',', ret_len); \
671 if (use_ldcache) \ 1029 if (use_ldpath) { \
1030 if ((p = lookup_config_lib(needed)) != NULL) \
1031 needed = p; \
1032 } else if (use_ldcache) { \
672 if ((p = lookup_cache_lib(elf, needed)) != NULL) \ 1033 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
673 needed = p; \ 1034 needed = p; \
1035 } \
674 xstrcat(ret, needed, ret_len); \ 1036 xstrcat(ret, needed, ret_len); \
675 } \ 1037 } \
676 *found_needed = 1; \ 1038 *found_needed = 1; \
677 } else { \ 1039 } else { \
678 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \ 1040 /* -N -> print matching entries */ \
1041 size_t n; \
1042 const char *find_lib_name; \
1043 \
1044 array_for_each(find_lib_arr, n, find_lib_name) { \
1045 int invert = 1; \
1046 if (find_lib_name[0] == '!') \
1047 invert = 0, ++find_lib_name; \
1048 if (!strcmp(find_lib_name, needed) == invert) \
1049 ++matched; \
1050 } \
1051 \
1052 if (matched == array_cnt(find_lib_arr)) { \
679 *found_lib = 1; \ 1053 *found_lib = 1; \
680 return (be_wewy_wewy_quiet ? NULL : needed); \ 1054 return (be_wewy_wewy_quiet ? NULL : find_lib); \
681 } \ 1055 } \
682 } \ 1056 } \
683 } \ 1057 } \
684 ++dyn; \ 1058 ++dyn; \
685 } \ 1059 } \
707 *found_interp = 1; \ 1081 *found_interp = 1; \
708 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \ 1082 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
709 } 1083 }
710 SHOW_INTERP(32) 1084 SHOW_INTERP(32)
711 SHOW_INTERP(64) 1085 SHOW_INTERP(64)
1086 } else {
1087 /* Walk all the program headers to find the PT_INTERP */
1088#define SHOW_PT_INTERP(B) \
1089 if (elf->elf_class == ELFCLASS ## B) { \
1090 unsigned long i; \
1091 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1092 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1093 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1094 if (EGET(phdr[i].p_type) != PT_INTERP) \
1095 continue; \
1096 *found_interp = 1; \
1097 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(phdr[i].p_offset)); \
1098 } \
712 } 1099 }
1100 SHOW_PT_INTERP(32)
1101 SHOW_PT_INTERP(64)
1102 }
1103
713 return NULL; 1104 return NULL;
714} 1105}
715static char *scanelf_file_bind(elfobj *elf, char *found_bind) 1106static const char *scanelf_file_bind(elfobj *elf, char *found_bind)
716{ 1107{
717 unsigned long i; 1108 unsigned long i;
718 struct stat s; 1109 struct stat s;
1110 bool dynamic = false;
719 1111
720 if (!show_bind) return NULL; 1112 if (!show_bind) return NULL;
721 if (!elf->phdr) return NULL; 1113 if (!elf->phdr) return NULL;
722 1114
723#define SHOW_BIND(B) \ 1115#define SHOW_BIND(B) \
725 Elf ## B ## _Dyn *dyn; \ 1117 Elf ## B ## _Dyn *dyn; \
726 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 1118 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
727 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 1119 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
728 Elf ## B ## _Off offset; \ 1120 Elf ## B ## _Off offset; \
729 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 1121 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
730 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 1122 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1123 dynamic = true; \
731 offset = EGET(phdr[i].p_offset); \ 1124 offset = EGET(phdr[i].p_offset); \
732 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 1125 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
733 dyn = DYN ## B (elf->data + offset); \ 1126 dyn = DYN ## B (elf->vdata + offset); \
734 while (EGET(dyn->d_tag) != DT_NULL) { \ 1127 while (EGET(dyn->d_tag) != DT_NULL) { \
735 if (EGET(dyn->d_tag) == DT_BIND_NOW || \ 1128 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
736 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \ 1129 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
737 { \ 1130 { \
738 if (be_quiet) return NULL; \ 1131 if (be_quiet) return NULL; \
746 SHOW_BIND(32) 1139 SHOW_BIND(32)
747 SHOW_BIND(64) 1140 SHOW_BIND(64)
748 1141
749 if (be_wewy_wewy_quiet) return NULL; 1142 if (be_wewy_wewy_quiet) return NULL;
750 1143
1144 /* 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)) { 1145 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
752 return NULL; 1146 return NULL;
753 } else { 1147 } else {
754 *found_bind = 1; 1148 *found_bind = 1;
755 return (char *) "LAZY"; 1149 return dynamic ? "LAZY" : "STATIC";
756 } 1150 }
757} 1151}
758static char *scanelf_file_soname(elfobj *elf, char *found_soname) 1152static char *scanelf_file_soname(elfobj *elf, char *found_soname)
759{ 1153{
760 unsigned long i; 1154 unsigned long i;
772 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 1166 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
773 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 1167 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
774 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 1168 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
775 Elf ## B ## _Off offset; \ 1169 Elf ## B ## _Off offset; \
776 /* only look for soname in shared objects */ \ 1170 /* only look for soname in shared objects */ \
777 if (ehdr->e_type != ET_DYN) \ 1171 if (EGET(ehdr->e_type) != ET_DYN) \
778 return NULL; \ 1172 return NULL; \
779 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 1173 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
780 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 1174 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
781 offset = EGET(phdr[i].p_offset); \ 1175 offset = EGET(phdr[i].p_offset); \
782 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 1176 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
783 dyn = DYN ## B (elf->data + offset); \ 1177 dyn = DYN ## B (elf->vdata + offset); \
784 while (EGET(dyn->d_tag) != DT_NULL) { \ 1178 while (EGET(dyn->d_tag) != DT_NULL) { \
785 if (EGET(dyn->d_tag) == DT_SONAME) { \ 1179 if (EGET(dyn->d_tag) == DT_SONAME) { \
786 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 1180 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
787 if (offset >= (Elf ## B ## _Off)elf->len) { \ 1181 if (offset >= (Elf ## B ## _Off)elf->len) { \
788 ++dyn; \ 1182 ++dyn; \
789 continue; \ 1183 continue; \
790 } \ 1184 } \
791 soname = (char*)(elf->data + offset); \ 1185 soname = elf->data + offset; \
792 *found_soname = 1; \ 1186 *found_soname = 1; \
793 return (be_wewy_wewy_quiet ? NULL : soname); \ 1187 return (be_wewy_wewy_quiet ? NULL : soname); \
794 } \ 1188 } \
795 ++dyn; \ 1189 ++dyn; \
796 } \ 1190 } \
799 SHOW_SONAME(64) 1193 SHOW_SONAME(64)
800 } 1194 }
801 1195
802 return NULL; 1196 return NULL;
803} 1197}
1198
1199/*
1200 * We support the symbol form:
1201 * [%[modifiers]%][[+-]<symbol name>][,[.....]]
1202 * If the symbol name is empty, then all symbols are matched.
1203 * If the symbol name is a glob ("*"), then all symbols are dumped (debug).
1204 * Do not rely on this output format at all.
1205 * Otherwise the symbol name is used to search (either regex or string compare).
1206 * If the first char of the symbol name is a plus ("+"), then only match
1207 * defined symbols. If it's a minus ("-"), only match undefined symbols.
1208 * Putting modifiers in between the percent signs allows for more in depth
1209 * filters. There are groups of modifiers. If you don't specify a member
1210 * of a group, then all types in that group are matched. The current
1211 * groups and their types are:
1212 * STT group: STT_NOTYPE:n STT_OBJECT:o STT_FUNC:f STT_FILE:F
1213 * STB group: STB_LOCAL:l STB_GLOBAL:g STB_WEAK:w
1214 * STV group: STV_DEFAULT:p STV_INTERNAL:i STV_HIDDEN:h STV_PROTECTED:P
1215 * SHN group: SHN_UNDEF:u SHN_ABS:a SHN_COMMON:c {defined}:d
1216 * The "defined" value in the SHN group does not correspond to a SHN_xxx define.
1217 * You can search for multiple symbols at once by seperating with a comma (",").
1218 *
1219 * Some examples:
1220 * ELFs with a weak function "foo":
1221 * scanelf -s %wf%foo <ELFs>
1222 * ELFs that define the symbol "main":
1223 * scanelf -s +main <ELFs>
1224 * scanelf -s %d%main <ELFs>
1225 * ELFs that refer to the undefined symbol "brk":
1226 * scanelf -s -brk <ELFs>
1227 * scanelf -s %u%brk <ELFs>
1228 * All global defined objects in an ELF:
1229 * scanelf -s %ogd% <ELF>
1230 */
1231static void
1232scanelf_match_symname(elfobj *elf, char *found_sym, char **ret, size_t *ret_len, const char *symname,
1233 unsigned int stt, unsigned int stb, unsigned int stv, unsigned int shn, unsigned long size)
1234{
1235 const char *this_sym;
1236 size_t n;
1237
1238 array_for_each(find_sym_arr, n, this_sym) {
1239 bool inc_notype, inc_object, inc_func, inc_file,
1240 inc_local, inc_global, inc_weak,
1241 inc_visdef, inc_intern, inc_hidden, inc_prot,
1242 inc_def, inc_undef, inc_abs, inc_common;
1243
1244 /* symbol selection! */
1245 inc_notype = inc_object = inc_func = inc_file =
1246 inc_local = inc_global = inc_weak =
1247 inc_visdef = inc_intern = inc_hidden = inc_prot =
1248 inc_def = inc_undef = inc_abs = inc_common =
1249 (*this_sym != '%');
1250
1251 /* parse the contents of %...% */
1252 if (!inc_notype) {
1253 while (*(this_sym++)) {
1254 if (*this_sym == '%') {
1255 ++this_sym;
1256 break;
1257 }
1258 switch (*this_sym) {
1259 case 'n': inc_notype = true; break;
1260 case 'o': inc_object = true; break;
1261 case 'f': inc_func = true; break;
1262 case 'F': inc_file = true; break;
1263 case 'l': inc_local = true; break;
1264 case 'g': inc_global = true; break;
1265 case 'w': inc_weak = true; break;
1266 case 'p': inc_visdef = true; break;
1267 case 'i': inc_intern = true; break;
1268 case 'h': inc_hidden = true; break;
1269 case 'P': inc_prot = true; break;
1270 case 'd': inc_def = true; break;
1271 case 'u': inc_undef = true; break;
1272 case 'a': inc_abs = true; break;
1273 case 'c': inc_common = true; break;
1274 default: err("invalid symbol selector '%c'", *this_sym);
1275 }
1276 }
1277
1278 /* If no types are matched, not match all */
1279 if (!inc_notype && !inc_object && !inc_func && !inc_file)
1280 inc_notype = inc_object = inc_func = inc_file = true;
1281 if (!inc_local && !inc_global && !inc_weak)
1282 inc_local = inc_global = inc_weak = true;
1283 if (!inc_visdef && !inc_intern && !inc_hidden && !inc_prot)
1284 inc_visdef = inc_intern = inc_hidden = inc_prot = true;
1285 if (!inc_def && !inc_undef && !inc_abs && !inc_common)
1286 inc_def = inc_undef = inc_abs = inc_common = true;
1287
1288 /* backwards compat for defined/undefined short hand */
1289 } else if (*this_sym == '+') {
1290 inc_undef = false;
1291 ++this_sym;
1292 } else if (*this_sym == '-') {
1293 inc_def = inc_abs = inc_common = false;
1294 ++this_sym;
1295 }
1296
1297 /* filter symbols */
1298 if ((!inc_notype && stt == STT_NOTYPE ) || \
1299 (!inc_object && stt == STT_OBJECT ) || \
1300 (!inc_func && stt == STT_FUNC ) || \
1301 (!inc_file && stt == STT_FILE ) || \
1302 (!inc_local && stb == STB_LOCAL ) || \
1303 (!inc_global && stb == STB_GLOBAL ) || \
1304 (!inc_weak && stb == STB_WEAK ) || \
1305 (!inc_visdef && stv == STV_DEFAULT ) || \
1306 (!inc_intern && stv == STV_INTERNAL ) || \
1307 (!inc_hidden && stv == STV_HIDDEN ) || \
1308 (!inc_prot && stv == STV_PROTECTED) || \
1309 (!inc_def && shn && shn < SHN_LORESERVE) || \
1310 (!inc_undef && shn == SHN_UNDEF ) || \
1311 (!inc_abs && shn == SHN_ABS ) || \
1312 (!inc_common && shn == SHN_COMMON ))
1313 continue;
1314
1315 if (*this_sym == '*') {
1316 /* a "*" symbol gets you debug output */
1317 printf("%s(%s) %5lX %-15s %-15s %-15s %-15s %s\n",
1318 ((*found_sym == 0) ? "\n\t" : "\t"),
1319 elf->base_filename,
1320 size,
1321 get_elfstttype(stt),
1322 get_elfstbtype(stb),
1323 get_elfstvtype(stv),
1324 get_elfshntype(shn),
1325 symname);
1326 goto matched;
1327
1328 } else {
1329 if (g_match) {
1330 /* regex match the symbol */
1331 if (regexec(find_sym_regex_arr->eles[n], symname, 0, NULL, 0) == REG_NOMATCH)
1332 continue;
1333
1334 } else if (*this_sym) {
1335 /* give empty symbols a "pass", else do a normal compare */
1336 const size_t len = strlen(this_sym);
1337 if (!(strncmp(this_sym, symname, len) == 0 &&
1338 /* Accept unversioned symbol names */
1339 (symname[len] == '\0' || symname[len] == '@')))
1340 continue;
1341 }
1342
1343 if (be_semi_verbose) {
1344 char buf[1024];
1345 snprintf(buf, sizeof(buf), "%lX %s %s",
1346 size,
1347 get_elfstttype(stt),
1348 this_sym);
1349 *ret = xstrdup(buf);
1350 } else {
1351 if (*ret) xchrcat(ret, ',', ret_len);
1352 xstrcat(ret, symname, ret_len);
1353 }
1354
1355 goto matched;
1356 }
1357 }
1358
1359 return;
1360
1361 matched:
1362 *found_sym = 1;
1363}
1364
804static char *scanelf_file_sym(elfobj *elf, char *found_sym) 1365static const char *scanelf_file_sym(elfobj *elf, char *found_sym)
805{ 1366{
806 unsigned long i;
807 char *ret; 1367 char *ret;
808 void *symtab_void, *strtab_void; 1368 void *symtab_void, *strtab_void;
809 1369
810 if (!find_sym) return NULL; 1370 if (!find_sym) return NULL;
811 ret = find_sym; 1371 ret = NULL;
812 1372
813 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void); 1373 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
814 1374
815 if (symtab_void && strtab_void) { 1375 if (symtab_void && strtab_void) {
816#define FIND_SYM(B) \ 1376#define FIND_SYM(B) \
817 if (elf->elf_class == ELFCLASS ## B) { \ 1377 if (elf->elf_class == ELFCLASS ## B) { \
818 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 1378 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
819 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 1379 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
820 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 1380 Elf ## B ## _Sym *sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
821 unsigned long cnt = EGET(symtab->sh_entsize); \ 1381 Elf ## B ## _Word i, cnt = EGET(symtab->sh_entsize); \
822 char *symname; \ 1382 char *symname; \
1383 size_t ret_len = 0; \
823 if (cnt) \ 1384 if (cnt) \
824 cnt = EGET(symtab->sh_size) / cnt; \ 1385 cnt = EGET(symtab->sh_size) / cnt; \
825 for (i = 0; i < cnt; ++i) { \ 1386 for (i = 0; i < cnt; ++i) { \
1387 if ((void*)sym > elf->data_end) { \
1388 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1389 goto break_out; \
1390 } \
826 if (sym->st_name) { \ 1391 if (sym->st_name) { \
1392 /* make sure the symbol name is in acceptable memory range */ \
827 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 1393 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
828 if ((void*)symname > (void*)elf->data_end) { \ 1394 if ((void*)symname > elf->data_end) { \
829 warnf("%s: corrupt ELF symbols", elf->filename); \ 1395 warnf("%s: corrupt ELF symbols", elf->filename); \
1396 ++sym; \
830 continue; \ 1397 continue; \
831 } \ 1398 } \
832 if (*find_sym == '*') { \ 1399 scanelf_match_symname(elf, found_sym, \
833 printf("%s(%s) %5lX %15s %s\n", \ 1400 &ret, &ret_len, symname, \
834 ((*found_sym == 0) ? "\n\t" : "\t"), \ 1401 ELF##B##_ST_TYPE(EGET(sym->st_info)), \
835 elf->base_filename, \ 1402 ELF##B##_ST_BIND(EGET(sym->st_info)), \
836 (unsigned long)sym->st_size, \ 1403 ELF##B##_ST_VISIBILITY(EGET(sym->st_other)), \
837 get_elfstttype(sym->st_info), \ 1404 EGET(sym->st_shndx), \
838 symname); \ 1405 /* st_size can be 64bit, but no one is really that big, so screw em */ \
839 *found_sym = 1; \ 1406 EGET(sym->st_size)); \
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 } \ 1407 } \
857 ++sym; \ 1408 ++sym; \
858 } } 1409 } \
1410 }
859 FIND_SYM(32) 1411 FIND_SYM(32)
860 FIND_SYM(64) 1412 FIND_SYM(64)
861 } 1413 }
862 1414
863break_out: 1415break_out:
866 if (*find_sym != '*' && *found_sym) 1418 if (*find_sym != '*' && *found_sym)
867 return ret; 1419 return ret;
868 if (be_quiet) 1420 if (be_quiet)
869 return NULL; 1421 return NULL;
870 else 1422 else
871 return (char *)" - "; 1423 return " - ";
872} 1424}
873 1425
1426static const char *scanelf_file_sections(elfobj *elf, char *found_section)
1427{
1428 if (!find_section)
1429 return NULL;
1430
1431#define FIND_SECTION(B) \
1432 if (elf->elf_class == ELFCLASS ## B) { \
1433 size_t matched, n; \
1434 int invert; \
1435 const char *section_name; \
1436 Elf ## B ## _Shdr *section; \
1437 \
1438 matched = 0; \
1439 array_for_each(find_section_arr, n, section_name) { \
1440 invert = (*section_name == '!' ? 1 : 0); \
1441 section = SHDR ## B (elf_findsecbyname(elf, section_name + invert)); \
1442 if ((section == NULL && invert) || (section != NULL && !invert)) \
1443 ++matched; \
1444 } \
1445 \
1446 if (matched == array_cnt(find_section_arr)) \
1447 *found_section = 1; \
1448 }
1449 FIND_SECTION(32)
1450 FIND_SECTION(64)
1451
1452 if (be_wewy_wewy_quiet)
1453 return NULL;
1454
1455 if (*found_section)
1456 return find_section;
1457
1458 if (be_quiet)
1459 return NULL;
1460 else
1461 return " - ";
1462}
874 1463
875/* scan an elf file and show all the fun stuff */ 1464/* scan an elf file and show all the fun stuff */
876#define prints(str) write(fileno(stdout), str, strlen(str)) 1465#define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
877static int scanelf_elfobj(elfobj *elf) 1466static int scanelf_elfobj(elfobj *elf)
878{ 1467{
879 unsigned long i; 1468 unsigned long i;
880 char found_pax, found_phdr, found_relro, found_load, found_textrel, 1469 char found_pax, found_phdr, found_relro, found_load, found_textrel,
881 found_rpath, found_needed, found_interp, found_bind, found_soname, 1470 found_rpath, found_needed, found_interp, found_bind, found_soname,
882 found_sym, found_lib, found_file, found_textrels; 1471 found_sym, found_lib, found_file, found_textrels, found_section;
883 static char *out_buffer = NULL; 1472 static char *out_buffer = NULL;
884 static size_t out_len; 1473 static size_t out_len;
885 1474
886 found_pax = found_phdr = found_relro = found_load = found_textrel = \ 1475 found_pax = found_phdr = found_relro = found_load = found_textrel = \
887 found_rpath = found_needed = found_interp = found_bind = found_soname = \ 1476 found_rpath = found_needed = found_interp = found_bind = found_soname = \
888 found_sym = found_lib = found_file = found_textrels = 0; 1477 found_sym = found_lib = found_file = found_textrels = found_section = 0;
889 1478
890 if (be_verbose > 2) 1479 if (be_verbose > 2)
891 printf("%s: scanning file {%s,%s}\n", elf->filename, 1480 printf("%s: scanning file {%s,%s}\n", elf->filename,
892 get_elfeitype(EI_CLASS, elf->elf_class), 1481 get_elfeitype(EI_CLASS, elf->elf_class),
893 get_elfeitype(EI_DATA, elf->data[EI_DATA])); 1482 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
895 printf("%s: scanning file\n", elf->filename); 1484 printf("%s: scanning file\n", elf->filename);
896 1485
897 /* init output buffer */ 1486 /* init output buffer */
898 if (!out_buffer) { 1487 if (!out_buffer) {
899 out_len = sizeof(char) * 80; 1488 out_len = sizeof(char) * 80;
900 out_buffer = (char*)xmalloc(out_len); 1489 out_buffer = xmalloc(out_len);
901 } 1490 }
902 *out_buffer = '\0'; 1491 *out_buffer = '\0';
903 1492
904 /* show the header */ 1493 /* show the header */
905 if (!be_quiet && show_banner) { 1494 if (!be_quiet && show_banner) {
906 for (i = 0; out_format[i]; ++i) { 1495 for (i = 0; out_format[i]; ++i) {
907 if (!IS_MODIFIER(out_format[i])) continue; 1496 if (!IS_MODIFIER(out_format[i])) continue;
908 1497
909 switch (out_format[++i]) { 1498 switch (out_format[++i]) {
1499 case '+': break;
910 case '%': break; 1500 case '%': break;
911 case '#': break; 1501 case '#': break;
912 case 'F': 1502 case 'F':
913 case 'p': 1503 case 'p':
914 case 'f': prints("FILE "); found_file = 1; break; 1504 case 'f': prints("FILE "); found_file = 1; break;
915 case 'o': prints(" TYPE "); break; 1505 case 'o': prints(" TYPE "); break;
916 case 'x': prints(" PAX "); break; 1506 case 'x': prints(" PAX "); break;
917 case 'e': prints("STK/REL/PTL "); break; 1507 case 'e': prints("STK/REL/PTL "); break;
918 case 't': prints("TEXTREL "); break; 1508 case 't': prints("TEXTREL "); break;
919 case 'r': prints("RPATH "); break; 1509 case 'r': prints("RPATH "); break;
1510 case 'M': prints("CLASS "); break;
1511 case 'l':
920 case 'n': prints("NEEDED "); break; 1512 case 'n': prints("NEEDED "); break;
921 case 'i': prints("INTERP "); break; 1513 case 'i': prints("INTERP "); break;
922 case 'b': prints("BIND "); break; 1514 case 'b': prints("BIND "); break;
1515 case 'Z': prints("SIZE "); break;
923 case 'S': prints("SONAME "); break; 1516 case 'S': prints("SONAME "); break;
924 case 's': prints("SYM "); break; 1517 case 's': prints("SYM "); break;
925 case 'N': prints("LIB "); break; 1518 case 'N': prints("LIB "); break;
926 case 'T': prints("TEXTRELS "); break; 1519 case 'T': prints("TEXTRELS "); break;
1520 case 'k': prints("SECTION "); break;
1521 case 'a': prints("ARCH "); break;
1522 case 'I': prints("OSABI "); break;
1523 case 'Y': prints("EABI "); break;
1524 case 'O': prints("PERM "); break;
1525 case 'D': prints("ENDIAN "); break;
927 default: warnf("'%c' has no title ?", out_format[i]); 1526 default: warnf("'%c' has no title ?", out_format[i]);
928 } 1527 }
929 } 1528 }
930 if (!found_file) prints("FILE "); 1529 if (!found_file) prints("FILE ");
931 prints("\n"); 1530 prints("\n");
935 1534
936 /* dump all the good stuff */ 1535 /* dump all the good stuff */
937 for (i = 0; out_format[i]; ++i) { 1536 for (i = 0; out_format[i]; ++i) {
938 const char *out; 1537 const char *out;
939 const char *tmp; 1538 const char *tmp;
940 1539 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])) { 1540 if (!IS_MODIFIER(out_format[i])) {
946 xchrcat(&out_buffer, out_format[i], &out_len); 1541 xchrcat(&out_buffer, out_format[i], &out_len);
947 continue; 1542 continue;
948 } 1543 }
949 1544
950 out = NULL; 1545 out = NULL;
951 be_wewy_wewy_quiet = (out_format[i] == '#'); 1546 be_wewy_wewy_quiet = (out_format[i] == '#');
1547 be_semi_verbose = (out_format[i] == '+');
952 switch (out_format[++i]) { 1548 switch (out_format[++i]) {
1549 case '+':
953 case '%': 1550 case '%':
954 case '#': 1551 case '#':
955 xchrcat(&out_buffer, out_format[i], &out_len); break; 1552 xchrcat(&out_buffer, out_format[i], &out_len); break;
956 case 'F': 1553 case 'F':
957 found_file = 1; 1554 found_file = 1;
983 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1580 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; 1581 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; 1582 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
986 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break; 1583 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; 1584 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1585 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1586 case 'D': out = get_endian(elf); break;
1587 case 'O': out = strfileperms(elf->filename); break;
988 case 'n': 1588 case 'n':
989 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break; 1589 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; 1590 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
991 case 'b': out = scanelf_file_bind(elf, &found_bind); break; 1591 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
992 case 'S': out = scanelf_file_soname(elf, &found_soname); break; 1592 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
993 case 's': out = scanelf_file_sym(elf, &found_sym); break; 1593 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1594 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1595 case 'a': out = get_elfemtype(elf); break;
1596 case 'I': out = get_elfosabi(elf); break;
1597 case 'Y': out = get_elf_eabi(elf); break;
1598 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]); 1599 default: warnf("'%c' has no scan code?", out_format[i]);
995 } 1600 }
996 if (out) { 1601 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); 1602 xstrcat(&out_buffer, out, &out_len);
1002 }
1003 } 1603 }
1004 1604
1005#define FOUND_SOMETHING() \ 1605#define FOUND_SOMETHING() \
1006 (found_pax || found_phdr || found_relro || found_load || found_textrel || \ 1606 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1007 found_rpath || found_needed || found_interp || found_bind || \ 1607 found_rpath || found_needed || found_interp || found_bind || \
1008 found_soname || found_sym || found_lib || found_textrels) 1608 found_soname || found_sym || found_lib || found_textrels || found_section )
1009 1609
1010 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) { 1610 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1011 xchrcat(&out_buffer, ' ', &out_len); 1611 xchrcat(&out_buffer, ' ', &out_len);
1012 xstrcat(&out_buffer, elf->filename, &out_len); 1612 xstrcat(&out_buffer, elf->filename, &out_len);
1013 } 1613 }
1020} 1620}
1021 1621
1022/* scan a single elf */ 1622/* scan a single elf */
1023static int scanelf_elf(const char *filename, int fd, size_t len) 1623static int scanelf_elf(const char *filename, int fd, size_t len)
1024{ 1624{
1025 int ret; 1625 int ret = 1;
1626 size_t n;
1627 const char *match_etype;
1026 elfobj *elf; 1628 elfobj *elf;
1027 1629
1028 /* verify this is real ELF */ 1630 /* Verify this is a real ELF */
1029 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) { 1631 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1030 if (be_verbose > 2) printf("%s: not an ELF\n", filename); 1632 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1031 return 1; 1633 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 } 1634 }
1045 if (atoi(sbuf) != get_etype(elf)) { 1635
1046 ret = 1; 1636 /* Possibly filter based on ELF bitness */
1637 switch (match_bits) {
1638 case 32:
1639 if (elf->elf_class != ELFCLASS32)
1047 goto label_done; 1640 goto done;
1641 break;
1642 case 64:
1643 if (elf->elf_class != ELFCLASS64)
1644 goto done;
1645 break;
1048 } 1646 }
1049 }
1050 1647
1051label_ret: 1648 /* Possibly filter based on the ELF's e_type field */
1649 array_for_each(match_etypes, n, match_etype)
1650 if (etype_lookup(match_etype) == get_etype(elf))
1651 goto scanit;
1652 if (array_cnt(match_etypes))
1653 goto done;
1654
1655 scanit:
1052 ret = scanelf_elfobj(elf); 1656 ret = scanelf_elfobj(elf);
1053 1657
1054label_done: 1658 done:
1055 unreadelf(elf); 1659 unreadelf(elf);
1056 return ret; 1660 return ret;
1057} 1661}
1058 1662
1059/* scan an archive of elfs */ 1663/* scan an archive of elfs */
1066 1670
1067 ar = ar_open_fd(filename, fd); 1671 ar = ar_open_fd(filename, fd);
1068 if (ar == NULL) 1672 if (ar == NULL)
1069 return 1; 1673 return 1;
1070 1674
1071 ar_buffer = (char*)mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0); 1675 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) { 1676 while ((m = ar_next(ar)) != NULL) {
1677 off_t cur_pos = lseek(fd, 0, SEEK_CUR);
1678 if (cur_pos == -1)
1679 errp("lseek() failed");
1073 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size); 1680 elf = readelf_buffer(m->name, ar_buffer + cur_pos, m->size);
1074 if (elf) { 1681 if (elf) {
1075 scanelf_elfobj(elf); 1682 scanelf_elfobj(elf);
1076 unreadelf(elf); 1683 unreadelf(elf);
1077 } 1684 }
1078 } 1685 }
1079 munmap(ar_buffer, len); 1686 munmap(ar_buffer, len);
1080 1687
1081 return 0; 1688 return 0;
1082} 1689}
1083/* scan a file which may be an elf or an archive or some other magical beast */ 1690/* scan a file which may be an elf or an archive or some other magical beast */
1084static void scanelf_file(const char *filename) 1691static int scanelf_fileat(int dir_fd, const char *filename, const struct stat *st_cache)
1085{ 1692{
1693 const struct stat *st = st_cache;
1086 struct stat st; 1694 struct stat symlink_st;
1087 int fd; 1695 int fd;
1088 1696
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 */ 1697 /* always handle regular files and handle symlinked files if no -y */
1096 if (S_ISLNK(st.st_mode)) { 1698 if (S_ISLNK(st->st_mode)) {
1097 if (!scan_symlink) return; 1699 if (!scan_symlink)
1098 stat(filename, &st); 1700 return 1;
1701 fstatat(dir_fd, filename, &symlink_st, 0);
1702 st = &symlink_st;
1099 } 1703 }
1704
1100 if (!S_ISREG(st.st_mode)) { 1705 if (!S_ISREG(st->st_mode)) {
1101 if (be_verbose > 2) printf("%s: skipping non-file\n", filename); 1706 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1102 return; 1707 return 1;
1103 } 1708 }
1104 1709
1105 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1) 1710 if (match_perms) {
1711 if ((st->st_mode | match_perms) != st->st_mode)
1712 return 1;
1713 }
1714 fd = openat(dir_fd, filename, (fix_elf ? O_RDWR : O_RDONLY) | O_CLOEXEC);
1715 if (fd == -1) {
1716 if (fix_elf && errno == ETXTBSY)
1717 warnp("%s: could not fix", filename);
1718 else if (be_verbose > 2)
1719 printf("%s: skipping file: %s\n", filename, strerror(errno));
1106 return; 1720 return 1;
1721 }
1107 1722
1108 if (scanelf_elf(filename, fd, st.st_size) == 1 && scan_archives) 1723 if (scanelf_elf(filename, fd, st->st_size) == 2) {
1109 /* if it isn't an ELF, maybe it's an .a archive */ 1724 /* if it isn't an ELF, maybe it's an .a archive */
1725 if (scan_archives)
1110 scanelf_archive(filename, fd, st.st_size); 1726 scanelf_archive(filename, fd, st->st_size);
1111 1727
1728 /*
1729 * unreadelf() implicitly closes its fd, so only close it
1730 * when we are returning it in the non-ELF case
1731 */
1112 close(fd); 1732 close(fd);
1733 }
1734
1735 return 0;
1113} 1736}
1114 1737
1115/* scan a directory for ET_EXEC files and print when we find one */ 1738/* scan a directory for ET_EXEC files and print when we find one */
1116static void scanelf_dir(const char *path) 1739static int scanelf_dirat(int dir_fd, const char *path)
1117{ 1740{
1118 register DIR *dir; 1741 register DIR *dir;
1119 register struct dirent *dentry; 1742 register struct dirent *dentry;
1120 struct stat st_top, st; 1743 struct stat st_top, st;
1121 char buf[__PAX_UTILS_PATH_MAX]; 1744 char buf[__PAX_UTILS_PATH_MAX], *subpath;
1122 size_t pathlen = 0, len = 0; 1745 size_t pathlen = 0, len = 0;
1746 int ret = 0;
1747 int subdir_fd;
1123 1748
1124 /* make sure path exists */ 1749 /* make sure path exists */
1125 if (lstat(path, &st_top) == -1) { 1750 if (fstatat(dir_fd, path, &st_top, AT_SYMLINK_NOFOLLOW) == -1) {
1126 if (be_verbose > 2) printf("%s: does not exist\n", path); 1751 if (be_verbose > 2) printf("%s: does not exist\n", path);
1127 return; 1752 return 1;
1128 } 1753 }
1129 1754
1130 /* ok, if it isn't a directory, assume we can open it */ 1755 /* ok, if it isn't a directory, assume we can open it */
1131 if (!S_ISDIR(st_top.st_mode)) { 1756 if (!S_ISDIR(st_top.st_mode))
1132 scanelf_file(path); 1757 return scanelf_fileat(dir_fd, path, &st_top);
1133 return;
1134 }
1135 1758
1136 /* now scan the dir looking for fun stuff */ 1759 /* now scan the dir looking for fun stuff */
1137 if ((dir = opendir(path)) == NULL) { 1760 subdir_fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
1138 warnf("could not opendir %s: %s", path, strerror(errno)); 1761 if (subdir_fd == -1)
1762 dir = NULL;
1763 else
1764 dir = fdopendir(subdir_fd);
1765 if (dir == NULL) {
1766 if (subdir_fd != -1)
1767 close(subdir_fd);
1768 else if (be_verbose > 2)
1769 printf("%s: skipping dir: %s\n", path, strerror(errno));
1139 return; 1770 return 1;
1140 } 1771 }
1141 if (be_verbose > 1) printf("%s: scanning dir\n", path); 1772 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1142 1773
1143 pathlen = strlen(path); 1774 subpath = stpcpy(buf, path);
1775 if (subpath[-1] != '/')
1776 *subpath++ = '/';
1777 pathlen = subpath - buf;
1144 while ((dentry = readdir(dir))) { 1778 while ((dentry = readdir(dir))) {
1145 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1779 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1146 continue; 1780 continue;
1781
1782 if (fstatat(subdir_fd, dentry->d_name, &st, AT_SYMLINK_NOFOLLOW) == -1)
1783 continue;
1784
1147 len = (pathlen + 1 + strlen(dentry->d_name) + 1); 1785 len = strlen(dentry->d_name);
1148 if (len >= sizeof(buf)) { 1786 if (len + pathlen + 1 >= sizeof(buf)) {
1149 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path, 1787 warnf("Skipping '%s%s': len > sizeof(buf); %zu > %zu\n",
1150 (unsigned long)len, (unsigned long)sizeof(buf)); 1788 path, dentry->d_name, len + pathlen + 1, sizeof(buf));
1151 continue; 1789 continue;
1152 } 1790 }
1153 sprintf(buf, "%s/%s", path, dentry->d_name); 1791 memcpy(subpath, dentry->d_name, len);
1154 if (lstat(buf, &st) != -1) { 1792 subpath[len] = '\0';
1793
1155 if (S_ISREG(st.st_mode)) 1794 if (S_ISREG(st.st_mode))
1156 scanelf_file(buf); 1795 ret = scanelf_fileat(dir_fd, buf, &st);
1157 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1796 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1158 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1797 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1159 scanelf_dir(buf); 1798 ret = scanelf_dirat(dir_fd, buf);
1160 }
1161 } 1799 }
1162 } 1800 }
1163 closedir(dir); 1801 closedir(dir);
1164}
1165 1802
1803 return ret;
1804}
1805static int scanelf_dir(const char *path)
1806{
1807 return scanelf_dirat(root_fd, root_rel_path(path));
1808}
1809
1166static int scanelf_from_file(char *filename) 1810static int scanelf_from_file(const char *filename)
1167{ 1811{
1168 FILE *fp = NULL; 1812 FILE *fp;
1169 char *p; 1813 char *p, *path;
1170 char path[__PAX_UTILS_PATH_MAX]; 1814 size_t len;
1815 int ret;
1171 1816
1172 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL)) 1817 if (strcmp(filename, "-") == 0)
1173 fp = stdin; 1818 fp = stdin;
1174 else if ((fp = fopen(filename, "r")) == NULL) 1819 else if ((fp = fopen(filename, "r")) == NULL)
1175 return 1; 1820 return 1;
1176 1821
1177 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) { 1822 path = NULL;
1823 len = 0;
1824 ret = 0;
1825 while (getline(&path, &len, fp) != -1) {
1178 if ((p = strchr(path, '\n')) != NULL) 1826 if ((p = strchr(path, '\n')) != NULL)
1179 *p = 0; 1827 *p = 0;
1180 search_path = path; 1828 search_path = path;
1181 scanelf_dir(path); 1829 ret = scanelf_dir(path);
1182 } 1830 }
1831 free(path);
1832
1183 if (fp != stdin) 1833 if (fp != stdin)
1184 fclose(fp); 1834 fclose(fp);
1835
1185 return 0; 1836 return ret;
1186} 1837}
1187 1838
1188static void load_ld_so_conf() 1839#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1840
1841static int _load_ld_cache_config(const char *fname)
1189{ 1842{
1190 FILE *fp = NULL; 1843 FILE *fp = NULL;
1191 char *p; 1844 char *p, *path;
1192 char path[__PAX_UTILS_PATH_MAX]; 1845 size_t len;
1193 int i = 0; 1846 int curr_fd = -1;
1194 1847
1195 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1848 fp = fopenat_r(root_fd, root_rel_path(fname));
1849 if (fp == NULL)
1196 return; 1850 return -1;
1197 1851
1198 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) { 1852 path = NULL;
1199 if (*path != '/') 1853 len = 0;
1200 continue; 1854 while (getline(&path, &len, fp) != -1) {
1201
1202 if ((p = strrchr(path, '\r')) != NULL) 1855 if ((p = strrchr(path, '\r')) != NULL)
1203 *p = 0; 1856 *p = 0;
1204 if ((p = strchr(path, '\n')) != NULL) 1857 if ((p = strchr(path, '\n')) != NULL)
1205 *p = 0; 1858 *p = 0;
1206 1859
1207 ldpaths[i++] = xstrdup(path); 1860 /* recursive includes of the same file will make this segfault. */
1861 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1862 glob_t gl;
1863 size_t x;
1864 const char *gpath;
1208 1865
1209 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths)) 1866 /* re-use existing path buffer ... need to be creative */
1210 break; 1867 if (path[8] != '/')
1868 gpath = memcpy(path + 3, "/etc/", 5);
1869 else
1870 gpath = path + 8;
1871 if (root_fd != AT_FDCWD) {
1872 if (curr_fd == -1) {
1873 curr_fd = open(".", O_RDONLY|O_CLOEXEC);
1874 if (fchdir(root_fd))
1875 errp("unable to change to root dir");
1876 }
1877 gpath = root_rel_path(gpath);
1878 }
1879
1880 if (glob(gpath, 0, NULL, &gl) == 0) {
1881 for (x = 0; x < gl.gl_pathc; ++x) {
1882 /* try to avoid direct loops */
1883 if (strcmp(gl.gl_pathv[x], fname) == 0)
1884 continue;
1885 _load_ld_cache_config(gl.gl_pathv[x]);
1886 }
1887 globfree(&gl);
1888 }
1889
1890 /* failed globs are ignored by glibc */
1891 continue;
1211 } 1892 }
1212 ldpaths[i] = NULL; 1893
1894 if (*path != '/')
1895 continue;
1896
1897 xarraypush_str(ldpaths, path);
1898 }
1899 free(path);
1213 1900
1214 fclose(fp); 1901 fclose(fp);
1902
1903 if (curr_fd != -1) {
1904 if (fchdir(curr_fd))
1905 {/* don't care */}
1906 close(curr_fd);
1907 }
1908
1909 return 0;
1910}
1911
1912#elif defined(__FreeBSD__) || defined(__DragonFly__)
1913
1914static int _load_ld_cache_config(const char *fname)
1915{
1916 FILE *fp = NULL;
1917 char *b = NULL, *p;
1918 struct elfhints_hdr hdr;
1919
1920 fp = fopenat_r(root_fd, root_rel_path(fname));
1921 if (fp == NULL)
1922 return -1;
1923
1924 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1925 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1926 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1927 {
1928 fclose(fp);
1929 return -1;
1930 }
1931
1932 b = xmalloc(hdr.dirlistlen + 1);
1933 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1934 fclose(fp);
1935 free(b);
1936 return -1;
1937 }
1938
1939 while ((p = strsep(&b, ":"))) {
1940 if (*p == '\0')
1941 continue;
1942 xarraypush_str(ldpaths, p);
1943 }
1944
1945 free(b);
1946 fclose(fp);
1947 return 0;
1948}
1949
1950#else
1951#ifdef __ELF__
1952#warning Cache config support not implemented for your target
1953#endif
1954static int _load_ld_cache_config(const char *fname)
1955{
1956 return 0;
1957}
1958#endif
1959
1960static void load_ld_cache_config(const char *fname)
1961{
1962 bool scan_l, scan_ul, scan_ull;
1963 size_t n;
1964 const char *ldpath;
1965
1966 _load_ld_cache_config(fname);
1967
1968 scan_l = scan_ul = scan_ull = false;
1969 array_for_each(ldpaths, n, ldpath) {
1970 if (!scan_l && !strcmp(ldpath, "/lib")) scan_l = true;
1971 if (!scan_ul && !strcmp(ldpath, "/usr/lib")) scan_ul = true;
1972 if (!scan_ull && !strcmp(ldpath, "/usr/local/lib")) scan_ull = true;
1973 }
1974
1975 if (!scan_l) xarraypush_str(ldpaths, "/lib");
1976 if (!scan_ul) xarraypush_str(ldpaths, "/usr/lib");
1977 if (!scan_ull) xarraypush_str(ldpaths, "/usr/local/lib");
1215} 1978}
1216 1979
1217/* scan /etc/ld.so.conf for paths */ 1980/* scan /etc/ld.so.conf for paths */
1218static void scanelf_ldpath() 1981static void scanelf_ldpath(void)
1219{ 1982{
1220 char scan_l, scan_ul, scan_ull; 1983 size_t n;
1221 int i = 0; 1984 const char *ldpath;
1222 1985
1223 if (!ldpaths[0]) 1986 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]); 1987 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} 1988}
1240 1989
1241/* scan env PATH for paths */ 1990/* scan env PATH for paths */
1242static void scanelf_envpath() 1991static void scanelf_envpath(void)
1243{ 1992{
1244 char *path, *p; 1993 char *path, *p;
1245 1994
1246 path = getenv("PATH"); 1995 path = getenv("PATH");
1247 if (!path) 1996 if (!path)
1254 } 2003 }
1255 2004
1256 free(path); 2005 free(path);
1257} 2006}
1258 2007
1259 2008/* 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" 2009#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZCBhV"
1262#define a_argument required_argument 2010#define a_argument required_argument
1263static struct option const long_opts[] = { 2011static struct option const long_opts[] = {
1264 {"path", no_argument, NULL, 'p'}, 2012 {"path", no_argument, NULL, 'p'},
1265 {"ldpath", no_argument, NULL, 'l'}, 2013 {"ldpath", no_argument, NULL, 'l'},
2014 {"use-ldpath",no_argument, NULL, 129},
2015 {"root", a_argument, NULL, 128},
1266 {"recursive", no_argument, NULL, 'R'}, 2016 {"recursive", no_argument, NULL, 'R'},
1267 {"mount", no_argument, NULL, 'm'}, 2017 {"mount", no_argument, NULL, 'm'},
1268 {"symlink", no_argument, NULL, 'y'}, 2018 {"symlink", no_argument, NULL, 'y'},
1269 {"archives", no_argument, NULL, 'A'}, 2019 {"archives", no_argument, NULL, 'A'},
1270 {"ldcache", no_argument, NULL, 'L'}, 2020 {"ldcache", no_argument, NULL, 'L'},
1271 {"fix", no_argument, NULL, 'X'}, 2021 {"fix", no_argument, NULL, 'X'},
2022 {"setpax", a_argument, NULL, 'z'},
1272 {"pax", no_argument, NULL, 'x'}, 2023 {"pax", no_argument, NULL, 'x'},
1273 {"header", no_argument, NULL, 'e'}, 2024 {"header", no_argument, NULL, 'e'},
1274 {"textrel", no_argument, NULL, 't'}, 2025 {"textrel", no_argument, NULL, 't'},
1275 {"rpath", no_argument, NULL, 'r'}, 2026 {"rpath", no_argument, NULL, 'r'},
1276 {"needed", no_argument, NULL, 'n'}, 2027 {"needed", no_argument, NULL, 'n'},
1277 {"interp", no_argument, NULL, 'i'}, 2028 {"interp", no_argument, NULL, 'i'},
1278 {"bind", no_argument, NULL, 'b'}, 2029 {"bind", no_argument, NULL, 'b'},
1279 {"soname", no_argument, NULL, 'S'}, 2030 {"soname", no_argument, NULL, 'S'},
1280 {"symbol", a_argument, NULL, 's'}, 2031 {"symbol", a_argument, NULL, 's'},
2032 {"section", a_argument, NULL, 'k'},
1281 {"lib", a_argument, NULL, 'N'}, 2033 {"lib", a_argument, NULL, 'N'},
1282 {"gmatch", no_argument, NULL, 'g'}, 2034 {"gmatch", no_argument, NULL, 'g'},
1283 {"textrels", no_argument, NULL, 'T'}, 2035 {"textrels", no_argument, NULL, 'T'},
1284 {"etype", a_argument, NULL, 'E'}, 2036 {"etype", a_argument, NULL, 'E'},
2037 {"bits", a_argument, NULL, 'M'},
2038 {"endian", no_argument, NULL, 'D'},
2039 {"osabi", no_argument, NULL, 'I'},
2040 {"eabi", no_argument, NULL, 'Y'},
2041 {"perms", a_argument, NULL, 'O'},
2042 {"size", no_argument, NULL, 'Z'},
1285 {"all", no_argument, NULL, 'a'}, 2043 {"all", no_argument, NULL, 'a'},
1286 {"quiet", no_argument, NULL, 'q'}, 2044 {"quiet", no_argument, NULL, 'q'},
1287 {"verbose", no_argument, NULL, 'v'}, 2045 {"verbose", no_argument, NULL, 'v'},
1288 {"format", a_argument, NULL, 'F'}, 2046 {"format", a_argument, NULL, 'F'},
1289 {"from", a_argument, NULL, 'f'}, 2047 {"from", a_argument, NULL, 'f'},
1290 {"file", a_argument, NULL, 'o'}, 2048 {"file", a_argument, NULL, 'o'},
2049 {"nocolor", no_argument, NULL, 'C'},
1291 {"nobanner", no_argument, NULL, 'B'}, 2050 {"nobanner", no_argument, NULL, 'B'},
1292 {"help", no_argument, NULL, 'h'}, 2051 {"help", no_argument, NULL, 'h'},
1293 {"version", no_argument, NULL, 'V'}, 2052 {"version", no_argument, NULL, 'V'},
1294 {NULL, no_argument, NULL, 0x0} 2053 {NULL, no_argument, NULL, 0x0}
1295}; 2054};
1296 2055
1297static const char *opts_help[] = { 2056static const char * const opts_help[] = {
1298 "Scan all directories in PATH environment", 2057 "Scan all directories in PATH environment",
1299 "Scan all directories in /etc/ld.so.conf", 2058 "Scan all directories in /etc/ld.so.conf",
2059 "Use ld.so.conf to show full path (use with -r/-n)",
2060 "Root directory (use with -l or -p)",
1300 "Scan directories recursively", 2061 "Scan directories recursively",
1301 "Don't recursively cross mount points", 2062 "Don't recursively cross mount points",
1302 "Don't scan symlinks", 2063 "Don't scan symlinks",
1303 "Scan archives (.a files)", 2064 "Scan archives (.a files)",
1304 "Utilize ld.so.cache information (use with -r/-n)", 2065 "Utilize ld.so.cache to show full path (use with -r/-n)",
1305 "Try and 'fix' bad things (use with -r/-e)\n", 2066 "Try and 'fix' bad things (use with -r/-e)",
2067 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1306 "Print PaX markings", 2068 "Print PaX markings",
1307 "Print GNU_STACK/PT_LOAD markings", 2069 "Print GNU_STACK/PT_LOAD markings",
1308 "Print TEXTREL information", 2070 "Print TEXTREL information",
1309 "Print RPATH information", 2071 "Print RPATH information",
1310 "Print NEEDED information", 2072 "Print NEEDED information",
1311 "Print INTERP information", 2073 "Print INTERP information",
1312 "Print BIND information", 2074 "Print BIND information",
1313 "Print SONAME information", 2075 "Print SONAME information",
1314 "Find a specified symbol", 2076 "Find a specified symbol",
2077 "Find a specified section",
1315 "Find a specified library", 2078 "Find a specified library",
1316 "Use strncmp to match libraries. (use with -N)", 2079 "Use regex rather than string compare (with -s); specify twice for case insensitive",
1317 "Locate cause of TEXTREL", 2080 "Locate cause of TEXTREL",
2081 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1318 "Print only ELF files matching numeric constant", 2082 "Print only ELF files matching numeric bits",
1319 "Print all scanned info (-x -e -t -r -b)\n", 2083 "Print Endianness",
2084 "Print OSABI",
2085 "Print EABI (EM_ARM Only)",
2086 "Print only ELF files matching octal permissions",
2087 "Print ELF file size",
2088 "Print all useful/simple info\n",
1320 "Only output 'bad' things", 2089 "Only output 'bad' things",
1321 "Be verbose (can be specified more than once)", 2090 "Be verbose (can be specified more than once)",
1322 "Use specified format for output", 2091 "Use specified format for output",
1323 "Read input stream from a filename", 2092 "Read input stream from a filename",
1324 "Write output stream to a filename", 2093 "Write output stream to a filename",
2094 "Don't emit color in output",
1325 "Don't display the header", 2095 "Don't display the header",
1326 "Print this help and exit", 2096 "Print this help and exit",
1327 "Print version and exit", 2097 "Print version and exit",
1328 NULL 2098 NULL
1329}; 2099};
1330 2100
1331/* display usage and exit */ 2101/* display usage and exit */
1332static void usage(int status) 2102static void usage(int status)
1333{ 2103{
1334 unsigned long i; 2104 const char a_arg[] = "<arg>";
2105 size_t a_arg_len = strlen(a_arg) + 2;
2106 size_t i;
2107 int optlen;
1335 printf("* Scan ELF binaries for stuff\n\n" 2108 printf("* Scan ELF binaries for stuff\n\n"
1336 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0); 2109 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1337 printf("Options: -[%s]\n", PARSE_FLAGS); 2110 printf("Options: -[%s]\n", PARSE_FLAGS);
2111
2112 /* prescan the --long opt length to auto-align */
2113 optlen = 0;
1338 for (i = 0; long_opts[i].name; ++i) 2114 for (i = 0; long_opts[i].name; ++i) {
2115 int l = strlen(long_opts[i].name);
2116 if (long_opts[i].has_arg == a_argument)
2117 l += a_arg_len;
2118 optlen = max(l, optlen);
2119 }
2120
2121 for (i = 0; long_opts[i].name; ++i) {
2122 /* first output the short flag if it has one */
2123 if (long_opts[i].val > '~')
2124 printf(" ");
2125 else
2126 printf(" -%c, ", long_opts[i].val);
2127
2128 /* then the long flag */
1339 if (long_opts[i].has_arg == no_argument) 2129 if (long_opts[i].has_arg == no_argument)
1340 printf(" -%c, --%-13s* %s\n", long_opts[i].val, 2130 printf("--%-*s", optlen, long_opts[i].name);
1341 long_opts[i].name, opts_help[i]);
1342 else 2131 else
1343 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val, 2132 printf("--%s %s %*s", long_opts[i].name, a_arg,
1344 long_opts[i].name, opts_help[i]); 2133 (int)(optlen - strlen(long_opts[i].name) - a_arg_len), "");
1345 2134
1346 if (status != EXIT_SUCCESS) 2135 /* finally the help text */
1347 exit(status); 2136 printf("* %s\n", opts_help[i]);
2137 }
1348 2138
1349 puts("\nThe format modifiers for the -F option are:"); 2139 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); 2140 exit(status);
1360} 2141}
1361 2142
1362/* parse command line arguments and preform needed actions */ 2143/* parse command line arguments and preform needed actions */
2144#define do_pax_state(option, flag) \
2145 if (islower(option)) { \
2146 flags &= ~PF_##flag; \
2147 flags |= PF_NO##flag; \
2148 } else { \
2149 flags &= ~PF_NO##flag; \
2150 flags |= PF_##flag; \
2151 }
2152static void parse_delimited(array_t *arr, char *arg, const char *delim)
2153{
2154 char *ele = strtok(arg, delim);
2155 if (!ele) /* edge case: -s '' */
2156 xarraypush_str(arr, "");
2157 while (ele) {
2158 xarraypush_str(arr, ele);
2159 ele = strtok(NULL, delim);
2160 }
2161}
1363static void parseargs(int argc, char *argv[]) 2162static int parseargs(int argc, char *argv[])
1364{ 2163{
1365 int i; 2164 int i;
1366 char *from_file = NULL; 2165 const char *from_file = NULL;
2166 int ret = 0;
2167 char load_cache_config = 0;
1367 2168
1368 opterr = 0; 2169 opterr = 0;
1369 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 2170 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1370 switch (i) { 2171 switch (i) {
1371 2172
1379 case 'f': 2180 case 'f':
1380 if (from_file) warn("You prob don't want to specify -f twice"); 2181 if (from_file) warn("You prob don't want to specify -f twice");
1381 from_file = optarg; 2182 from_file = optarg;
1382 break; 2183 break;
1383 case 'E': 2184 case 'E':
1384 strncpy(match_etypes, optarg, sizeof(match_etypes)); 2185 /* historically, this was comma delimited */
2186 parse_delimited(match_etypes, optarg, ",");
2187 break;
2188 case 'M':
2189 match_bits = atoi(optarg);
2190 if (match_bits == 0) {
2191 if (strcmp(optarg, "ELFCLASS32") == 0)
2192 match_bits = 32;
2193 if (strcmp(optarg, "ELFCLASS64") == 0)
2194 match_bits = 64;
2195 }
2196 break;
2197 case 'O':
2198 if (sscanf(optarg, "%o", &match_perms) == -1)
2199 match_bits = 0;
1385 break; 2200 break;
1386 case 'o': { 2201 case 'o': {
1387 FILE *fp = NULL;
1388 if ((fp = freopen(optarg, "w", stdout)) == NULL) 2202 if (freopen(optarg, "w", stdout) == NULL)
1389 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 2203 errp("Could not freopen(%s)", optarg);
1390 SET_STDOUT(fp);
1391 break; 2204 break;
1392 } 2205 }
1393
1394 case 's': { 2206 case 'k':
1395 if (find_sym) warn("You prob don't want to specify -s twice"); 2207 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; 2208 break;
1400 }
1401 case 'N': { 2209 case 's':
1402 if (find_lib) warn("You prob don't want to specify -N twice"); 2210 /* historically, this was comma delimited */
1403 find_lib = optarg; 2211 parse_delimited(find_sym_arr, optarg, ",");
1404 break; 2212 break;
1405 } 2213 case 'N':
1406 2214 xarraypush_str(find_lib_arr, optarg);
2215 break;
1407 case 'F': { 2216 case 'F': {
1408 if (out_format) warn("You prob don't want to specify -F twice"); 2217 if (out_format) warn("You prob don't want to specify -F twice");
1409 out_format = optarg; 2218 out_format = optarg;
1410 break; 2219 break;
1411 } 2220 }
2221 case 'z': {
2222 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
2223 size_t x;
1412 2224
1413 case 'g': gmatch = 1; /* break; any reason we dont breal; here ? */ 2225 for (x = 0; x < strlen(optarg); x++) {
2226 switch (optarg[x]) {
2227 case 'p':
2228 case 'P':
2229 do_pax_state(optarg[x], PAGEEXEC);
2230 break;
2231 case 's':
2232 case 'S':
2233 do_pax_state(optarg[x], SEGMEXEC);
2234 break;
2235 case 'm':
2236 case 'M':
2237 do_pax_state(optarg[x], MPROTECT);
2238 break;
2239 case 'e':
2240 case 'E':
2241 do_pax_state(optarg[x], EMUTRAMP);
2242 break;
2243 case 'r':
2244 case 'R':
2245 do_pax_state(optarg[x], RANDMMAP);
2246 break;
2247 case 'x':
2248 case 'X':
2249 do_pax_state(optarg[x], RANDEXEC);
2250 break;
2251 default:
2252 break;
2253 }
2254 }
2255 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
2256 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
2257 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
2258 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
2259 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
2260 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
2261 setpax = flags;
2262 break;
2263 }
2264 case 'Z': show_size = 1; break;
2265 case 'g': ++g_match; break;
1414 case 'L': use_ldcache = 1; break; 2266 case 'L': load_cache_config = use_ldcache = 1; break;
1415 case 'y': scan_symlink = 0; break; 2267 case 'y': scan_symlink = 0; break;
1416 case 'A': scan_archives = 1; break; 2268 case 'A': scan_archives = 1; break;
2269 case 'C': color_init(true); break;
1417 case 'B': show_banner = 0; break; 2270 case 'B': show_banner = 0; break;
1418 case 'l': scan_ldpath = 1; break; 2271 case 'l': load_cache_config = scan_ldpath = 1; break;
1419 case 'p': scan_envpath = 1; break; 2272 case 'p': scan_envpath = 1; break;
1420 case 'R': dir_recurse = 1; break; 2273 case 'R': dir_recurse = 1; break;
1421 case 'm': dir_crossmount = 0; break; 2274 case 'm': dir_crossmount = 0; break;
1422 case 'X': ++fix_elf; break; 2275 case 'X': ++fix_elf; break;
1423 case 'x': show_pax = 1; break; 2276 case 'x': show_pax = 1; break;
1427 case 'n': show_needed = 1; break; 2280 case 'n': show_needed = 1; break;
1428 case 'i': show_interp = 1; break; 2281 case 'i': show_interp = 1; break;
1429 case 'b': show_bind = 1; break; 2282 case 'b': show_bind = 1; break;
1430 case 'S': show_soname = 1; break; 2283 case 'S': show_soname = 1; break;
1431 case 'T': show_textrels = 1; break; 2284 case 'T': show_textrels = 1; break;
1432 case 'q': be_quiet = 1; break; 2285 case 'q': be_quiet = min(be_quiet, 20) + 1; break;
1433 case 'v': be_verbose = (be_verbose % 20) + 1; break; 2286 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; 2287 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
1435 2288 case 'D': show_endian = 1; break;
2289 case 'I': show_osabi = 1; break;
2290 case 'Y': show_eabi = 1; break;
2291 case 128:
2292 root_fd = open(optarg, O_RDONLY|O_CLOEXEC);
2293 if (root_fd == -1)
2294 err("Could not open root: %s", optarg);
2295 break;
2296 case 129: load_cache_config = use_ldpath = 1; break;
1436 case ':': 2297 case ':':
1437 err("Option '%c' is missing parameter", optopt); 2298 err("Option '%c' is missing parameter", optopt);
1438 case '?': 2299 case '?':
1439 err("Unknown option '%c' or argument missing", optopt); 2300 err("Unknown option '%c' or argument missing", optopt);
1440 default: 2301 default:
1441 err("Unhandled option '%c'; please report this", i); 2302 err("Unhandled option '%c'; please report this", i);
1442 } 2303 }
1443 } 2304 }
2305 if (show_textrels && be_verbose)
2306 objdump = which("objdump", "OBJDUMP");
2307 /* precompile all the regexes */
2308 if (g_match) {
2309 regex_t preg;
2310 const char *this_sym;
2311 size_t n;
2312 int flags = REG_EXTENDED | REG_NOSUB | (g_match > 1 ? REG_ICASE : 0);
1444 2313
2314 array_for_each(find_sym_arr, n, this_sym) {
2315 /* see scanelf_match_symname for logic info */
2316 switch (this_sym[0]) {
2317 case '%':
2318 while (*(this_sym++))
2319 if (*this_sym == '%') {
2320 ++this_sym;
2321 break;
2322 }
2323 break;
2324 case '+':
2325 case '-':
2326 ++this_sym;
2327 break;
2328 }
2329 if (*this_sym == '*')
2330 ++this_sym;
2331
2332 ret = regcomp(&preg, this_sym, flags);
2333 if (ret) {
2334 char err[256];
2335 regerror(ret, &preg, err, sizeof(err));
2336 err("regcomp of %s failed: %s", this_sym, err);
2337 }
2338 xarraypush(find_sym_regex_arr, &preg, sizeof(preg));
2339 }
2340 }
2341 /* flatten arrays for display */
2342 find_sym = array_flatten_str(find_sym_arr);
2343 find_lib = array_flatten_str(find_lib_arr);
2344 find_section = array_flatten_str(find_section_arr);
1445 /* let the format option override all other options */ 2345 /* let the format option override all other options */
1446 if (out_format) { 2346 if (out_format) {
1447 show_pax = show_phdr = show_textrel = show_rpath = \ 2347 show_pax = show_phdr = show_textrel = show_rpath = \
1448 show_needed = show_interp = show_bind = show_soname = \ 2348 show_needed = show_interp = show_bind = show_soname = \
1449 show_textrels = 0; 2349 show_textrels = show_perms = show_endian = show_size = \
2350 show_osabi = show_eabi = 0;
1450 for (i = 0; out_format[i]; ++i) { 2351 for (i = 0; out_format[i]; ++i) {
1451 if (!IS_MODIFIER(out_format[i])) continue; 2352 if (!IS_MODIFIER(out_format[i])) continue;
1452 2353
1453 switch (out_format[++i]) { 2354 switch (out_format[++i]) {
2355 case '+': break;
1454 case '%': break; 2356 case '%': break;
1455 case '#': break; 2357 case '#': break;
1456 case 'F': break; 2358 case 'F': break;
1457 case 'p': break; 2359 case 'p': break;
1458 case 'f': break; 2360 case 'f': break;
2361 case 'k': break;
1459 case 's': break; 2362 case 's': break;
1460 case 'N': break; 2363 case 'N': break;
1461 case 'o': break; 2364 case 'o': break;
2365 case 'a': break;
2366 case 'M': break;
2367 case 'Z': show_size = 1; break;
2368 case 'D': show_endian = 1; break;
2369 case 'I': show_osabi = 1; break;
2370 case 'Y': show_eabi = 1; break;
2371 case 'O': show_perms = 1; break;
1462 case 'x': show_pax = 1; break; 2372 case 'x': show_pax = 1; break;
1463 case 'e': show_phdr = 1; break; 2373 case 'e': show_phdr = 1; break;
1464 case 't': show_textrel = 1; break; 2374 case 't': show_textrel = 1; break;
1465 case 'r': show_rpath = 1; break; 2375 case 'r': show_rpath = 1; break;
1466 case 'n': show_needed = 1; break; 2376 case 'n': show_needed = 1; break;
1467 case 'i': show_interp = 1; break; 2377 case 'i': show_interp = 1; break;
1468 case 'b': show_bind = 1; break; 2378 case 'b': show_bind = 1; break;
1469 case 'S': show_soname = 1; break; 2379 case 'S': show_soname = 1; break;
1470 case 'T': show_textrels = 1; break; 2380 case 'T': show_textrels = 1; break;
1471 default: 2381 default:
1472 err("Invalid format specifier '%c' (byte %i)", 2382 err("invalid format specifier '%c' (byte %i)",
1473 out_format[i], i+1); 2383 out_format[i], i+1);
1474 } 2384 }
1475 } 2385 }
1476 2386
1477 /* construct our default format */ 2387 /* construct our default format */
1478 } else { 2388 } else {
1479 size_t fmt_len = 30; 2389 size_t fmt_len = 30;
1480 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 2390 out_format = xmalloc(sizeof(char) * fmt_len);
2391 *out_format = '\0';
1481 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 2392 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1482 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len); 2393 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
2394 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
2395 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
2396 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
2397 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
2398 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
1483 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len); 2399 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1484 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 2400 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1485 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 2401 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1486 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 2402 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1487 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 2403 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1488 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len); 2404 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1489 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len); 2405 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1490 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len); 2406 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1491 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len); 2407 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
2408 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1492 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len); 2409 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1493 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 2410 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1494 } 2411 }
1495 if (be_verbose > 2) printf("Format: %s\n", out_format); 2412 if (be_verbose > 2) printf("Format: %s\n", out_format);
1496 2413
1497 /* now lets actually do the scanning */ 2414 /* now lets actually do the scanning */
1498 if (scan_ldpath || use_ldcache) 2415 if (load_cache_config)
1499 load_ld_so_conf(); 2416 load_ld_cache_config(__PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
1500 if (scan_ldpath) scanelf_ldpath(); 2417 if (scan_ldpath) scanelf_ldpath();
1501 if (scan_envpath) scanelf_envpath(); 2418 if (scan_envpath) scanelf_envpath();
2419 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
2420 from_file = "-";
1502 if (from_file) { 2421 if (from_file) {
1503 scanelf_from_file(from_file); 2422 scanelf_from_file(from_file);
1504 from_file = *argv; 2423 from_file = *argv;
1505 } 2424 }
1506 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file) 2425 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1507 err("Nothing to scan !?"); 2426 err("Nothing to scan !?");
1508 while (optind < argc) { 2427 while (optind < argc) {
1509 search_path = argv[optind++]; 2428 search_path = argv[optind++];
1510 scanelf_dir(search_path); 2429 ret = scanelf_dir(search_path);
1511 } 2430 }
1512 2431
2432#ifdef __PAX_UTILS_CLEANUP
1513 /* clean up */ 2433 /* clean up */
1514 if (versioned_symname) free(versioned_symname);
1515 for (i = 0; ldpaths[i]; ++i)
1516 free(ldpaths[i]); 2434 xarrayfree(ldpaths);
2435 xarrayfree(find_sym_arr);
2436 xarrayfree(find_lib_arr);
2437 xarrayfree(find_section_arr);
2438 free(find_sym);
2439 free(find_lib);
2440 free(find_section);
2441 {
2442 size_t n;
2443 regex_t *preg;
2444 array_for_each(find_sym_regex_arr, n, preg)
2445 regfree(preg);
2446 xarrayfree(find_sym_regex_arr);
2447 }
1517 2448
1518 if (ldcache != 0) 2449 if (ldcache != 0)
1519 munmap(ldcache, ldcache_size); 2450 munmap(ldcache, ldcache_size);
1520} 2451#endif
1521 2452
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; 2453 return ret;
1530} 2454}
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 2455
1541 new_len = strlen(*dst) + strlen(src); 2456static 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{ 2457{
1556 static char my_app[2]; 2458 const char *delims = " \t\n";
1557 my_app[0] = append; 2459 char **envvals = NULL;
1558 my_app[1] = '\0'; 2460 char *env, *s;
1559 xstrcat(dst, my_app, curr_len); 2461 int nentry;
1560}
1561 2462
2463 if ((env = getenv(envvar)) == NULL)
2464 return NULL;
1562 2465
2466 env = xstrdup(env);
2467 if (env == NULL)
2468 return NULL;
2469
2470 s = strtok(env, delims);
2471 if (s == NULL) {
2472 free(env);
2473 return NULL;
2474 }
2475
2476 nentry = 0;
2477 while (s != NULL) {
2478 ++nentry;
2479 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
2480 envvals[nentry-1] = s;
2481 s = strtok(NULL, delims);
2482 }
2483 envvals[nentry] = NULL;
2484
2485 /* don't want to free(env) as it contains the memory that backs
2486 * the envvals array of strings */
2487 return envvals;
2488}
2489
2490static void parseenv(void)
2491{
2492 color_init(false);
2493 qa_textrels = get_split_env("QA_TEXTRELS");
2494 qa_execstack = get_split_env("QA_EXECSTACK");
2495 qa_wx_load = get_split_env("QA_WX_LOAD");
2496}
2497
2498#ifdef __PAX_UTILS_CLEANUP
2499static void cleanup(void)
2500{
2501 free(out_format);
2502 free(qa_textrels);
2503 free(qa_execstack);
2504 free(qa_wx_load);
2505}
2506#endif
1563 2507
1564int main(int argc, char *argv[]) 2508int main(int argc, char *argv[])
1565{ 2509{
2510 int ret;
1566 if (argc < 2) 2511 if (argc < 2)
1567 usage(EXIT_FAILURE); 2512 usage(EXIT_FAILURE);
2513 parseenv();
1568 parseargs(argc, argv); 2514 ret = parseargs(argc, argv);
1569 fclose(stdout); 2515 fclose(stdout);
1570#ifdef __BOUNDS_CHECKING_ON 2516#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()"); 2517 cleanup();
2518 warn("The calls to add/delete heap should be off:\n"
2519 "\t- 1 due to the out_buffer not being freed in scanelf_fileat()\n"
2520 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
1572#endif 2521#endif
1573 return EXIT_SUCCESS; 2522 return ret;
1574} 2523}
2524
2525/* Match filename against entries in matchlist, return TRUE
2526 * if the file is listed */
2527static int file_matches_list(const char *filename, char **matchlist)
2528{
2529 char **file;
2530 char *match;
2531 char buf[__PAX_UTILS_PATH_MAX];
2532
2533 if (matchlist == NULL)
2534 return 0;
2535
2536 for (file = matchlist; *file != NULL; file++) {
2537 if (search_path) {
2538 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2539 match = buf;
2540 } else {
2541 match = *file;
2542 }
2543 if (fnmatch(match, filename, 0) == 0)
2544 return 1;
2545 }
2546 return 0;
2547}

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