/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.127 Revision 1.267
1/* 1/*
2 * Copyright 2003-2006 Gentoo Foundation 2 * Copyright 2003-2012 Gentoo Foundation
3 * Distributed under the terms of the GNU General Public License v2 3 * Distributed under the terms of the GNU General Public License v2
4 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.127 2006/02/17 07:13:54 solar Exp $ 4 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.267 2014/10/19 07:31:20 vapier Exp $
5 * 5 *
6 * Copyright 2003-2006 Ned Ludd - <solar@gentoo.org> 6 * Copyright 2003-2012 Ned Ludd - <solar@gentoo.org>
7 * Copyright 2004-2006 Mike Frysinger - <vapier@gentoo.org> 7 * Copyright 2004-2012 Mike Frysinger - <vapier@gentoo.org>
8 */ 8 */
9 9
10static const char rcsid[] = "$Id: scanelf.c,v 1.267 2014/10/19 07:31:20 vapier Exp $";
11const char argv0[] = "scanelf";
12
10#include "paxinc.h" 13#include "paxinc.h"
11 14
12static const char *rcsid = "$Id: scanelf.c,v 1.127 2006/02/17 07:13:54 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;
59static char *find_section = NULL; 53static char *find_section = NULL;
54static array_t _find_section_arr = array_init_decl, *find_section_arr = &_find_section_arr;
60static char *out_format = NULL; 55static char *out_format = NULL;
61static char *search_path = NULL; 56static char *search_path = NULL;
62static char fix_elf = 0; 57static char fix_elf = 0;
63static char gmatch = 0; 58static char g_match = 0;
64static char use_ldcache = 0; 59static char use_ldcache = 0;
60static char use_ldpath = 0;
65 61
62static char **qa_textrels = NULL;
63static char **qa_execstack = NULL;
64static char **qa_wx_load = NULL;
65static int root_fd = AT_FDCWD;
66
66int match_bits = 0; 67static int match_bits = 0;
67caddr_t ldcache = 0; 68static unsigned int match_perms = 0;
69static void *ldcache = NULL;
68size_t ldcache_size = 0; 70static size_t ldcache_size = 0;
69unsigned long setpax = 0UL; 71static unsigned long setpax = 0UL;
70 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
71/* sub-funcs for scanelf_file() */ 164/* sub-funcs for scanelf_fileat() */
72static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab) 165static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **str)
73{ 166{
74 /* 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 */
75#define GET_SYMTABS(B) \ 185#define GET_SYMTABS(B) \
76 if (elf->elf_class == ELFCLASS ## B) { \ 186 if (elf->elf_class == ELFCLASS ## B) { \
77 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \ 187 Elf ## B ## _Shdr *esymtab = symtab; \
78 /* debug sections */ \ 188 Elf ## B ## _Shdr *estrtab = strtab; \
79 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \ 189 Elf ## B ## _Shdr *edynsym = dynsym; \
80 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \ 190 Elf ## B ## _Shdr *edynstr = dynstr; \
81 /* runtime sections */ \ 191 \
82 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \ 192 if (symtab && EGET(esymtab->sh_type) == SHT_NOBITS) \
83 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \ 193 symtab = NULL; \
84 if (symtab && dynsym) { \ 194 if (dynsym && EGET(edynsym->sh_type) == SHT_NOBITS) \
85 *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; \
86 } else { \ 205 else \
87 *sym = (void*)(symtab ? symtab : dynsym); \ 206 goto runtime##B; \
207 } else if (symtab && strtab) { \
208 debug##B: \
209 *sym = symtab; \
210 *str = strtab; \
211 return; \
212 } else if (dynsym && dynstr) { \
213 runtime##B: \
214 *sym = dynsym; \
215 *str = dynstr; \
216 return; \
88 } \ 217 } \
89 if (strtab && dynstr) { \
90 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \
91 } else { \
92 *tab = (void*)(strtab ? strtab : dynstr); \
93 } \
94 } 218 }
95 GET_SYMTABS(32) 219 GET_SYMTABS(32)
96 GET_SYMTABS(64) 220 GET_SYMTABS(64)
221
222 if (*sym && *str)
223 return;
224
225 /*
226 * damn, they're really going to make us work for it huh?
227 * reconstruct the section header info out of the dynamic
228 * tags so we can see what symbols this guy uses at runtime.
229 */
230#define GET_SYMTABS_DT(B) \
231 if (elf->elf_class == ELFCLASS ## B) { \
232 size_t i; \
233 static Elf ## B ## _Shdr sym_shdr, str_shdr; \
234 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
235 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
236 Elf ## B ## _Addr vsym, vstr, vhash, vgnu_hash; \
237 Elf ## B ## _Dyn *dyn; \
238 Elf ## B ## _Off offset; \
239 \
240 /* lookup symbols used at runtime with DT_SYMTAB / DT_STRTAB */ \
241 vsym = vstr = vhash = vgnu_hash = 0; \
242 memset(&sym_shdr, 0, sizeof(sym_shdr)); \
243 memset(&str_shdr, 0, sizeof(str_shdr)); \
244 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
245 if (EGET(phdr[i].p_type) != PT_DYNAMIC) \
246 continue; \
247 \
248 offset = EGET(phdr[i].p_offset); \
249 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
250 continue; \
251 \
252 dyn = DYN ## B (elf->vdata + offset); \
253 while (EGET(dyn->d_tag) != DT_NULL) { \
254 switch (EGET(dyn->d_tag)) { \
255 case DT_SYMTAB: vsym = EGET(dyn->d_un.d_val); break; \
256 case DT_SYMENT: sym_shdr.sh_entsize = dyn->d_un.d_val; break; \
257 case DT_STRTAB: vstr = EGET(dyn->d_un.d_val); break; \
258 case DT_STRSZ: str_shdr.sh_size = dyn->d_un.d_val; break; \
259 case DT_HASH: vhash = EGET(dyn->d_un.d_val); break; \
260 /*case DT_GNU_HASH: vgnu_hash = EGET(dyn->d_un.d_val); break;*/ \
261 } \
262 ++dyn; \
263 } \
264 if (vsym && vstr) \
265 break; \
266 } \
267 if (!vsym || !vstr || !(vhash || vgnu_hash)) \
268 return; \
269 \
270 /* calc offset into the ELF by finding the load addr of the syms */ \
271 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
272 Elf ## B ## _Addr vaddr = EGET(phdr[i].p_vaddr); \
273 Elf ## B ## _Addr filesz = EGET(phdr[i].p_filesz); \
274 offset = EGET(phdr[i].p_offset); \
275 \
276 if (EGET(phdr[i].p_type) != PT_LOAD) \
277 continue; \
278 \
279 if (vhash >= vaddr && vhash < vaddr + filesz) { \
280 /* Scan the hash table to see how many entries we have */ \
281 Elf32_Word max_sym_idx = 0; \
282 Elf32_Word *hashtbl = elf->vdata + offset + (vhash - vaddr); \
283 Elf32_Word b, nbuckets = EGET(hashtbl[0]); \
284 Elf32_Word nchains = EGET(hashtbl[1]); \
285 Elf32_Word *buckets = &hashtbl[2]; \
286 Elf32_Word *chains = &buckets[nbuckets]; \
287 Elf32_Word sym_idx; \
288 \
289 for (b = 0; b < nbuckets; ++b) { \
290 if (!buckets[b]) \
291 continue; \
292 for (sym_idx = buckets[b]; sym_idx < nchains && sym_idx; sym_idx = chains[sym_idx]) \
293 if (max_sym_idx < sym_idx) \
294 max_sym_idx = sym_idx; \
295 } \
296 ESET(sym_shdr.sh_size, sym_shdr.sh_entsize * max_sym_idx); \
297 } \
298 \
299 if (vsym >= vaddr && vsym < vaddr + filesz) { \
300 ESET(sym_shdr.sh_offset, offset + (vsym - vaddr)); \
301 *sym = &sym_shdr; \
302 } \
303 \
304 if (vstr >= vaddr && vstr < vaddr + filesz) { \
305 ESET(str_shdr.sh_offset, offset + (vstr - vaddr)); \
306 *str = &str_shdr; \
307 } \
308 } \
309 }
310 GET_SYMTABS_DT(32)
311 GET_SYMTABS_DT(64)
97} 312}
98 313
99static char *scanelf_file_pax(elfobj *elf, char *found_pax) 314static char *scanelf_file_pax(elfobj *elf, char *found_pax)
100{ 315{
101 static char ret[7]; 316 static char ret[7];
116 continue; \ 331 continue; \
117 if (fix_elf && setpax) { \ 332 if (fix_elf && setpax) { \
118 /* set the paxctl flags */ \ 333 /* set the paxctl flags */ \
119 ESET(phdr[i].p_flags, setpax); \ 334 ESET(phdr[i].p_flags, setpax); \
120 } \ 335 } \
121 if (be_quiet && (EGET(phdr[i].p_flags) == 10240)) \ 336 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
122 continue; \ 337 continue; \
123 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \ 338 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
124 *found_pax = 1; \ 339 *found_pax = 1; \
125 ++shown; \ 340 ++shown; \
126 break; \ 341 break; \
128 } 343 }
129 SHOW_PAX(32) 344 SHOW_PAX(32)
130 SHOW_PAX(64) 345 SHOW_PAX(64)
131 } 346 }
132 347
348 /* Note: We do not support setting EI_PAX if not PT_PAX_FLAGS
349 * was found. This is known to break ELFs on glibc systems,
350 * and mainline PaX has deprecated use of this for a long time.
351 * We could support changing PT_GNU_STACK, but that doesn't
352 * seem like it's worth the effort. #411919
353 */
354
133 /* fall back to EI_PAX if no PT_PAX was found */ 355 /* fall back to EI_PAX if no PT_PAX was found */
134 if (!*ret) { 356 if (!*ret) {
135 static char *paxflags; 357 static char *paxflags;
136
137 if (fix_elf && setpax) {
138 /* set the chpax settings */
139 // ESET(EHDR ## B (elf->ehdr)->e_ident[EI_PAX]), setpax);
140 }
141
142 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf)); 358 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
143 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) { 359 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
144 *found_pax = 1; 360 *found_pax = 1;
145 return (be_wewy_wewy_quiet ? NULL : paxflags); 361 return (be_wewy_wewy_quiet ? NULL : paxflags);
146 } 362 }
156static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load) 372static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
157{ 373{
158 static char ret[12]; 374 static char ret[12];
159 char *found; 375 char *found;
160 unsigned long i, shown, multi_stack, multi_relro, multi_load; 376 unsigned long i, shown, multi_stack, multi_relro, multi_load;
161 int max_pt_load;
162 377
163 if (!show_phdr) return NULL; 378 if (!show_phdr) return NULL;
164 379
165 memcpy(ret, "--- --- ---\0", 12); 380 memcpy(ret, "--- --- ---\0", 12);
166 381
167 shown = 0; 382 shown = 0;
168 multi_stack = multi_relro = multi_load = 0; 383 multi_stack = multi_relro = multi_load = 0;
169 max_pt_load = elf_max_pt_load(elf);
170 384
171#define NOTE_GNU_STACK ".note.GNU-stack" 385#define NOTE_GNU_STACK ".note.GNU-stack"
172#define SHOW_PHDR(B) \ 386#define SHOW_PHDR(B) \
173 if (elf->elf_class == ELFCLASS ## B) { \ 387 if (elf->elf_class == ELFCLASS ## B) { \
174 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 388 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
176 uint32_t flags, check_flags; \ 390 uint32_t flags, check_flags; \
177 if (elf->phdr != NULL) { \ 391 if (elf->phdr != NULL) { \
178 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 392 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
179 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \ 393 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
180 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \ 394 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
395 if (multi_stack++) \
181 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \ 396 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
397 if (file_matches_list(elf->filename, qa_execstack)) \
398 continue; \
182 found = found_phdr; \ 399 found = found_phdr; \
183 offset = 0; \ 400 offset = 0; \
184 check_flags = PF_X; \ 401 check_flags = PF_X; \
185 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \ 402 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
403 if (multi_relro++) \
186 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \ 404 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
187 found = found_relro; \ 405 found = found_relro; \
188 offset = 4; \ 406 offset = 4; \
189 check_flags = PF_X; \ 407 check_flags = PF_X; \
190 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \ 408 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
191 if (ehdr->e_type == ET_DYN || ehdr->e_type == ET_EXEC) \ 409 if (file_matches_list(elf->filename, qa_wx_load)) \
192 if (multi_load++ > max_pt_load) warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \ 410 continue; \
193 found = found_load; \ 411 found = found_load; \
194 offset = 8; \ 412 offset = 8; \
195 check_flags = PF_W|PF_X; \ 413 check_flags = PF_W|PF_X; \
196 } else \ 414 } else \
197 continue; \ 415 continue; \
198 flags = EGET(phdr[i].p_flags); \ 416 flags = EGET(phdr[i].p_flags); \
199 if (be_quiet && ((flags & check_flags) != check_flags)) \ 417 if (be_quiet && ((flags & check_flags) != check_flags)) \
200 continue; \ 418 continue; \
201 if (fix_elf && ((flags & PF_X) != flags)) { \ 419 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
202 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \ 420 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
203 ret[3] = ret[7] = '!'; \ 421 ret[3] = ret[7] = '!'; \
204 flags = EGET(phdr[i].p_flags); \ 422 flags = EGET(phdr[i].p_flags); \
205 } \ 423 } \
206 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \ 424 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
210 } else if (elf->shdr != NULL) { \ 428 } else if (elf->shdr != NULL) { \
211 /* no program headers which means this is prob an object file */ \ 429 /* no program headers which means this is prob an object file */ \
212 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \ 430 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
213 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \ 431 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
214 char *str; \ 432 char *str; \
215 if ((void*)strtbl > (void*)elf->data_end) \ 433 if ((void*)strtbl > elf->data_end) \
216 goto skip_this_shdr##B; \ 434 goto skip_this_shdr##B; \
435 /* let's flag -w/+x object files since the final ELF will most likely \
436 * need write access to the stack (who doesn't !?). so the combined \
437 * output will bring in +w automatically and that's bad. \
438 */ \
217 check_flags = SHF_WRITE|SHF_EXECINSTR; \ 439 check_flags = /*SHF_WRITE|*/SHF_EXECINSTR; \
218 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \ 440 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
219 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \ 441 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
220 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \ 442 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
221 str = elf->data + offset; \ 443 str = elf->data + offset; \
222 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \ 444 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
234 break; \ 456 break; \
235 } \ 457 } \
236 } \ 458 } \
237 skip_this_shdr##B: \ 459 skip_this_shdr##B: \
238 if (!multi_stack) { \ 460 if (!multi_stack) { \
461 if (file_matches_list(elf->filename, qa_execstack)) \
462 return NULL; \
239 *found_phdr = 1; \ 463 *found_phdr = 1; \
240 shown = 1; \ 464 shown = 1; \
241 memcpy(ret, "!WX", 3); \ 465 memcpy(ret, "!WX", 3); \
242 } \ 466 } \
243 } \ 467 } \
248 if (be_wewy_wewy_quiet || (be_quiet && !shown)) 472 if (be_wewy_wewy_quiet || (be_quiet && !shown))
249 return NULL; 473 return NULL;
250 else 474 else
251 return ret; 475 return ret;
252} 476}
477
478/*
479 * See if this ELF contains a DT_TEXTREL tag in any of its
480 * PT_DYNAMIC sections.
481 */
253static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 482static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
254{ 483{
255 static const char *ret = "TEXTREL"; 484 static const char *ret = "TEXTREL";
256 unsigned long i; 485 unsigned long i;
257 486
258 if (!show_textrel && !show_textrels) return NULL; 487 if (!show_textrel && !show_textrels) return NULL;
488
489 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
259 490
260 if (elf->phdr) { 491 if (elf->phdr) {
261#define SHOW_TEXTREL(B) \ 492#define SHOW_TEXTREL(B) \
262 if (elf->elf_class == ELFCLASS ## B) { \ 493 if (elf->elf_class == ELFCLASS ## B) { \
263 Elf ## B ## _Dyn *dyn; \ 494 Elf ## B ## _Dyn *dyn; \
264 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 495 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
265 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 496 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
266 Elf ## B ## _Off offset; \ 497 Elf ## B ## _Off offset; \
267 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 498 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
268 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 499 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
269 offset = EGET(phdr[i].p_offset); \ 500 offset = EGET(phdr[i].p_offset); \
270 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 501 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
271 dyn = DYN ## B (elf->data + offset); \ 502 dyn = DYN ## B (elf->vdata + offset); \
272 while (EGET(dyn->d_tag) != DT_NULL) { \ 503 while (EGET(dyn->d_tag) != DT_NULL) { \
273 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \ 504 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
274 *found_textrel = 1; \ 505 *found_textrel = 1; \
275 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \ 506 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
276 return (be_wewy_wewy_quiet ? NULL : ret); \ 507 return (be_wewy_wewy_quiet ? NULL : ret); \
285 if (be_quiet || be_wewy_wewy_quiet) 516 if (be_quiet || be_wewy_wewy_quiet)
286 return NULL; 517 return NULL;
287 else 518 else
288 return " - "; 519 return " - ";
289} 520}
521
522/*
523 * Scan the .text section to see if there are any relocations in it.
524 * Should rewrite this to check PT_LOAD sections that are marked
525 * Executable rather than the section named '.text'.
526 */
290static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel) 527static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
291{ 528{
292 unsigned long s, r, rmax; 529 unsigned long s, r, rmax;
293 void *symtab_void, *strtab_void, *text_void; 530 void *symtab_void, *strtab_void, *text_void;
294 531
315 Elf ## B ## _Rela *rela; \ 552 Elf ## B ## _Rela *rela; \
316 /* search the section headers for relocations */ \ 553 /* search the section headers for relocations */ \
317 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \ 554 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
318 uint32_t sh_type = EGET(shdr[s].sh_type); \ 555 uint32_t sh_type = EGET(shdr[s].sh_type); \
319 if (sh_type == SHT_REL) { \ 556 if (sh_type == SHT_REL) { \
320 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \ 557 rel = REL ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
321 rela = NULL; \ 558 rela = NULL; \
322 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \ 559 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
323 } else if (sh_type == SHT_RELA) { \ 560 } else if (sh_type == SHT_RELA) { \
324 rel = NULL; \ 561 rel = NULL; \
325 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \ 562 rela = RELA ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
326 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \ 563 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
327 } else \ 564 } else \
328 continue; \ 565 continue; \
329 /* now see if any of the relocs are in the .text */ \ 566 /* now see if any of the relocs are in the .text */ \
330 for (r = 0; r < rmax; ++r) { \ 567 for (r = 0; r < rmax; ++r) { \
345 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \ 582 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
346 if (be_verbose <= 2) continue; \ 583 if (be_verbose <= 2) continue; \
347 } else \ 584 } else \
348 *found_textrels = 1; \ 585 *found_textrels = 1; \
349 /* locate this relocation symbol name */ \ 586 /* locate this relocation symbol name */ \
350 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 587 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
351 if ((void*)sym > (void*)elf->data_end) { \ 588 if ((void*)sym > elf->data_end) { \
352 warn("%s: corrupt ELF symbol", elf->filename); \ 589 warn("%s: corrupt ELF symbol", elf->filename); \
353 continue; \ 590 continue; \
354 } \ 591 } \
355 sym_max = ELF ## B ## _R_SYM(r_info); \ 592 sym_max = ELF ## B ## _R_SYM(r_info); \
356 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \ 593 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
359 sym = NULL; \ 596 sym = NULL; \
360 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 597 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
361 /* show the raw details about this reloc */ \ 598 /* show the raw details about this reloc */ \
362 printf(" %s: ", elf->base_filename); \ 599 printf(" %s: ", elf->base_filename); \
363 if (sym && sym->st_name) \ 600 if (sym && sym->st_name) \
364 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \ 601 printf("%s", elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
365 else \ 602 else \
366 printf("(memory/fake?)"); \ 603 printf("(memory/data?)"); \
367 printf(" [0x%lX]", (unsigned long)r_offset); \ 604 printf(" [0x%lX]", (unsigned long)r_offset); \
368 /* now try to find the closest symbol that this rel is probably in */ \ 605 /* now try to find the closest symbol that this rel is probably in */ \
369 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 606 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
370 func = NULL; \ 607 func = NULL; \
371 offset_tmp = 0; \ 608 offset_tmp = 0; \
372 while (sym_max--) { \ 609 while (sym_max--) { \
373 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \ 610 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
374 func = sym; \ 611 func = sym; \
375 offset_tmp = EGET(sym->st_value); \ 612 offset_tmp = EGET(sym->st_value); \
376 } \ 613 } \
377 ++sym; \ 614 ++sym; \
378 } \ 615 } \
379 printf(" in "); \ 616 printf(" in "); \
380 if (func && func->st_name) \ 617 if (func && func->st_name) { \
381 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \ 618 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
619 if (r_offset > EGET(func->st_size)) \
620 printf("(optimized out: previous %s)", func_name); \
382 else \ 621 else \
383 printf("(NULL: fake?)"); \ 622 printf("%s", func_name); \
623 } else \
624 printf("(optimized out)"); \
384 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \ 625 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
626 if (be_verbose && objdump) { \
627 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
628 char *sysbuf; \
629 size_t syslen; \
630 const char sysfmt[] = "%s -r -R -d -w -l --start-address=0x%lX --stop-address=0x%lX %s | grep --color -i -C 3 '.*[[:space:]]%lX:[[:space:]]*R_.*'\n"; \
631 syslen = sizeof(sysfmt) + strlen(objdump) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
632 sysbuf = xmalloc(syslen); \
633 if (end_addr < r_offset) \
634 /* not uncommon when things are optimized out */ \
635 end_addr = r_offset + 0x100; \
636 snprintf(sysbuf, syslen, sysfmt, \
637 objdump, \
638 (unsigned long)offset_tmp, \
639 (unsigned long)end_addr, \
640 elf->filename, \
641 (unsigned long)r_offset); \
642 fflush(stdout); \
643 if (system(sysbuf)) {/* don't care */} \
644 fflush(stdout); \
645 free(sysbuf); \
646 } \
385 } \ 647 } \
386 } } 648 } }
387 SHOW_TEXTRELS(32) 649 SHOW_TEXTRELS(32)
388 SHOW_TEXTRELS(64) 650 SHOW_TEXTRELS(64)
389 } 651 }
391 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename); 653 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
392 654
393 return NULL; 655 return NULL;
394} 656}
395 657
396static void rpath_security_checks(elfobj *, char *, const char *);
397static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type) 658static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
398{ 659{
399 struct stat st; 660 struct stat st;
400 switch (*item) { 661 switch (*item) {
401 case '/': break; 662 case '/': break;
407 warnf("Security problem NULL %s in %s", dt_type, elf->filename); 668 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
408 break; 669 break;
409 case '$': 670 case '$':
410 if (fstat(elf->fd, &st) != -1) 671 if (fstat(elf->fd, &st) != -1)
411 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID)) 672 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
412 warnf("Security problem with %s='%s' in %s with mode set of %o", 673 warnf("Security problem with %s='%s' in %s with mode set of %o",
413 dt_type, item, elf->filename, st.st_mode & 07777); 674 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
414 break; 675 break;
415 default: 676 default:
416 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename); 677 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
417 break; 678 break;
418 } 679 }
419} 680}
420static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len) 681static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
421{ 682{
422 unsigned long i, s; 683 unsigned long i;
423 char *rpath, *runpath, **r; 684 char *rpath, *runpath, **r;
424 void *strtbl_void; 685 void *strtbl_void;
425 686
426 if (!show_rpath) return; 687 if (!show_rpath) return;
427 688
438 Elf ## B ## _Off offset; \ 699 Elf ## B ## _Off offset; \
439 Elf ## B ## _Xword word; \ 700 Elf ## B ## _Xword word; \
440 /* Scan all the program headers */ \ 701 /* Scan all the program headers */ \
441 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 702 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
442 /* Just scan dynamic headers */ \ 703 /* Just scan dynamic headers */ \
443 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 704 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
444 offset = EGET(phdr[i].p_offset); \ 705 offset = EGET(phdr[i].p_offset); \
445 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 706 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
446 /* Just scan dynamic RPATH/RUNPATH headers */ \ 707 /* Just scan dynamic RPATH/RUNPATH headers */ \
447 dyn = DYN ## B (elf->data + offset); \ 708 dyn = DYN ## B (elf->vdata + offset); \
448 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \ 709 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
449 if (word == DT_RPATH) { \ 710 if (word == DT_RPATH) { \
450 r = &rpath; \ 711 r = &rpath; \
451 } else if (word == DT_RUNPATH) { \ 712 } else if (word == DT_RUNPATH) { \
452 r = &runpath; \ 713 r = &runpath; \
456 } \ 717 } \
457 /* Verify the memory is somewhat sane */ \ 718 /* Verify the memory is somewhat sane */ \
458 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 719 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
459 if (offset < (Elf ## B ## _Off)elf->len) { \ 720 if (offset < (Elf ## B ## _Off)elf->len) { \
460 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \ 721 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
461 *r = (char*)(elf->data + offset); \ 722 *r = elf->data + offset; \
462 /* cache the length in case we need to nuke this section later on */ \ 723 /* cache the length in case we need to nuke this section later on */ \
463 if (fix_elf) \ 724 if (fix_elf) \
464 offset = strlen(*r); \ 725 offset = strlen(*r); \
465 /* If quiet, don't output paths in ld.so.conf */ \ 726 /* If quiet, don't output paths in ld.so.conf */ \
466 if (be_quiet) { \ 727 if (be_quiet) { \
472 /* scan each path in : delimited list */ \ 733 /* scan each path in : delimited list */ \
473 while (start) { \ 734 while (start) { \
474 rpath_security_checks(elf, start, get_elfdtype(word)); \ 735 rpath_security_checks(elf, start, get_elfdtype(word)); \
475 end = strchr(start, ':'); \ 736 end = strchr(start, ':'); \
476 len = (end ? abs(end - start) : strlen(start)); \ 737 len = (end ? abs(end - start) : strlen(start)); \
477 if (use_ldcache) \ 738 if (use_ldcache) { \
478 for (s = 0; ldpaths[s]; ++s) \ 739 size_t n; \
740 const char *ldpath; \
741 array_for_each(ldpaths, n, ldpath) \
479 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \ 742 if (!strncmp(ldpath, start, len) && !ldpath[len]) { \
480 *r = end; \ 743 *r = end; \
481 /* corner case ... if RPATH reads "/usr/lib:", we want \ 744 /* corner case ... if RPATH reads "/usr/lib:", we want \
482 * to show ':' rather than '' */ \ 745 * to show ':' rather than '' */ \
483 if (end && end[1] != '\0') \ 746 if (end && end[1] != '\0') \
484 (*r)++; \ 747 (*r)++; \
485 break; \ 748 break; \
486 } \ 749 } \
750 } \
487 if (!*r || !end) \ 751 if (!*r || !end) \
488 break; \ 752 break; \
489 else \ 753 else \
490 start = start + len + 1; \ 754 start = start + len + 1; \
491 } \ 755 } \
557 xstrcat(ret, (runpath ? runpath : rpath), ret_len); 821 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
558 else if (!be_quiet) 822 else if (!be_quiet)
559 xstrcat(ret, " - ", ret_len); 823 xstrcat(ret, " - ", ret_len);
560} 824}
561 825
826/* Defines can be seen in glibc's sysdeps/generic/ldconfig.h */
562#define LDSO_CACHE_MAGIC "ld.so-" 827#define LDSO_CACHE_MAGIC "ld.so-"
563#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1) 828#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
564#define LDSO_CACHE_VER "1.7.0" 829#define LDSO_CACHE_VER "1.7.0"
565#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1) 830#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
566#define FLAG_ANY -1 831#define FLAG_ANY -1
575#define FLAG_X8664_LIB64 0x0300 840#define FLAG_X8664_LIB64 0x0300
576#define FLAG_S390_LIB64 0x0400 841#define FLAG_S390_LIB64 0x0400
577#define FLAG_POWERPC_LIB64 0x0500 842#define FLAG_POWERPC_LIB64 0x0500
578#define FLAG_MIPS64_LIBN32 0x0600 843#define FLAG_MIPS64_LIBN32 0x0600
579#define FLAG_MIPS64_LIBN64 0x0700 844#define FLAG_MIPS64_LIBN64 0x0700
845#define FLAG_X8664_LIBX32 0x0800
846#define FLAG_ARM_LIBHF 0x0900
847#define FLAG_AARCH64_LIB64 0x0a00
580 848
581static char *lookup_cache_lib(elfobj *, char *); 849#if defined(__GLIBC__) || defined(__UCLIBC__)
850
582static char *lookup_cache_lib(elfobj *elf, char *fname) 851static char *lookup_cache_lib(elfobj *elf, const char *fname)
583{ 852{
584 int fd = 0; 853 int fd;
585 char *strs; 854 char *strs;
586 static char buf[__PAX_UTILS_PATH_MAX] = ""; 855 static char buf[__PAX_UTILS_PATH_MAX] = "";
587 const char *cachefile = "/etc/ld.so.cache"; 856 const char *cachefile = root_rel_path("/etc/ld.so.cache");
588 struct stat st; 857 struct stat st;
589 858
590 typedef struct { 859 typedef struct {
591 char magic[LDSO_CACHE_MAGIC_LEN]; 860 char magic[LDSO_CACHE_MAGIC_LEN];
592 char version[LDSO_CACHE_VER_LEN]; 861 char version[LDSO_CACHE_VER_LEN];
602 libentry_t *libent; 871 libentry_t *libent;
603 872
604 if (fname == NULL) 873 if (fname == NULL)
605 return NULL; 874 return NULL;
606 875
607 if (ldcache == 0) { 876 if (ldcache == NULL) {
608 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1) 877 if (fstatat(root_fd, cachefile, &st, 0))
878 return NULL;
879
880 fd = openat(root_fd, cachefile, O_RDONLY);
881 if (fd == -1)
609 return NULL; 882 return NULL;
610 883
611 /* cache these values so we only map/unmap the cache file once */ 884 /* cache these values so we only map/unmap the cache file once */
612 ldcache_size = st.st_size; 885 ldcache_size = st.st_size;
613 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0); 886 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
614
615 close(fd); 887 close(fd);
616 888
617 if (ldcache == (caddr_t)-1) { 889 if (ldcache == MAP_FAILED) {
618 ldcache = 0; 890 ldcache = NULL;
619 return NULL; 891 return NULL;
620 } 892 }
621 893
622 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN)) 894 if (memcmp(header->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN) ||
895 memcmp(header->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
896 {
897 munmap(ldcache, ldcache_size);
898 ldcache = NULL;
623 return NULL; 899 return NULL;
624 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
625 return NULL;
626 } 900 }
901 } else
902 header = ldcache;
627 903
628 header = (header_t *) ldcache;
629 libent = (libentry_t *) (ldcache + sizeof(header_t)); 904 libent = ldcache + sizeof(header_t);
630 strs = (char *) &libent[header->nlibs]; 905 strs = (char *) &libent[header->nlibs];
631 906
632 for (fd = 0; fd < header->nlibs; fd++) { 907 for (fd = 0; fd < header->nlibs; ++fd) {
633 /* this should be more fine grained, but for now we assume that 908 /* This should be more fine grained, but for now we assume that
634 * diff arches will not be cached together. and we ignore the 909 * diff arches will not be cached together, and we ignore the
635 * the different multilib mips cases. */ 910 * the different multilib mips cases.
911 */
636 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK)) 912 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
637 continue; 913 continue;
638 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK)) 914 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
639 continue; 915 continue;
640 916
641 if (strcmp(fname, strs + libent[fd].sooffset) != 0) 917 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
642 continue; 918 continue;
919
920 /* Return first hit because that is how the ldso rolls */
643 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf)); 921 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
922 break;
644 } 923 }
924
645 return buf; 925 return buf;
646} 926}
647 927
928#elif defined(__NetBSD__)
929static char *lookup_cache_lib(elfobj *elf, const char *fname)
930{
931 static char buf[__PAX_UTILS_PATH_MAX] = "";
932 static struct stat st;
933 size_t n;
934 char *ldpath;
935
936 array_for_each(ldpath, n, ldpath) {
937 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", ldpath, fname) >= sizeof(buf))
938 continue; /* if the pathname is too long, or something went wrong, ignore */
939
940 if (stat(buf, &st) != 0)
941 continue; /* if the lib doesn't exist in *ldpath, look further */
942
943 /* NetBSD doesn't actually do sanity checks, it just loads the file
944 * and if that doesn't work, continues looking in other directories.
945 * This cannot easily be safely emulated, unfortunately. For now,
946 * just assume that if it exists, it's a valid library. */
947
948 return buf;
949 }
950
951 /* not found in any path */
952 return NULL;
953}
954#else
955#ifdef __ELF__
956#warning Cache support not implemented for your target
957#endif
958static char *lookup_cache_lib(elfobj *elf, const char *fname)
959{
960 return NULL;
961}
962#endif
963
964static char *lookup_config_lib(const char *fname)
965{
966 static char buf[__PAX_UTILS_PATH_MAX] = "";
967 const char *ldpath;
968 size_t n;
969
970 array_for_each(ldpaths, n, ldpath) {
971 snprintf(buf, sizeof(buf), "%s/%s", root_rel_path(ldpath), fname);
972 if (faccessat(root_fd, buf, F_OK, AT_SYMLINK_NOFOLLOW) == 0)
973 return buf;
974 }
975
976 return NULL;
977}
648 978
649static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len) 979static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
650{ 980{
651 unsigned long i; 981 unsigned long i;
652 char *needed; 982 char *needed;
653 void *strtbl_void; 983 void *strtbl_void;
654 char *p; 984 char *p;
655 985
986 /*
987 * -n -> op==0 -> print all
988 * -N -> op==1 -> print requested
989 */
656 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL; 990 if ((op == 0 && !show_needed) || (op == 1 && !find_lib))
991 return NULL;
657 992
658 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 993 strtbl_void = elf_findsecbyname(elf, ".dynstr");
659 994
660 if (elf->phdr && strtbl_void) { 995 if (elf->phdr && strtbl_void) {
661#define SHOW_NEEDED(B) \ 996#define SHOW_NEEDED(B) \
663 Elf ## B ## _Dyn *dyn; \ 998 Elf ## B ## _Dyn *dyn; \
664 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 999 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
665 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 1000 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
666 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 1001 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
667 Elf ## B ## _Off offset; \ 1002 Elf ## B ## _Off offset; \
1003 size_t matched = 0; \
1004 /* Walk all the program headers to find the PT_DYNAMIC */ \
668 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 1005 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
669 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 1006 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) \
1007 continue; \
670 offset = EGET(phdr[i].p_offset); \ 1008 offset = EGET(phdr[i].p_offset); \
671 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 1009 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
1010 continue; \
1011 /* Walk all the dynamic tags to find NEEDED entries */ \
672 dyn = DYN ## B (elf->data + offset); \ 1012 dyn = DYN ## B (elf->vdata + offset); \
673 while (EGET(dyn->d_tag) != DT_NULL) { \ 1013 while (EGET(dyn->d_tag) != DT_NULL) { \
674 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 1014 if (EGET(dyn->d_tag) == DT_NEEDED) { \
675 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 1015 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
676 if (offset >= (Elf ## B ## _Off)elf->len) { \ 1016 if (offset >= (Elf ## B ## _Off)elf->len) { \
677 ++dyn; \ 1017 ++dyn; \
678 continue; \ 1018 continue; \
679 } \ 1019 } \
680 needed = (char*)(elf->data + offset); \ 1020 needed = elf->data + offset; \
681 if (op == 0) { \ 1021 if (op == 0) { \
1022 /* -n -> print all entries */ \
682 if (!be_wewy_wewy_quiet) { \ 1023 if (!be_wewy_wewy_quiet) { \
683 if (*found_needed) xchrcat(ret, ',', ret_len); \ 1024 if (*found_needed) xchrcat(ret, ',', ret_len); \
684 if (use_ldcache) \ 1025 if (use_ldpath) { \
1026 if ((p = lookup_config_lib(needed)) != NULL) \
1027 needed = p; \
1028 } else if (use_ldcache) { \
685 if ((p = lookup_cache_lib(elf, needed)) != NULL) \ 1029 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
686 needed = p; \ 1030 needed = p; \
1031 } \
687 xstrcat(ret, needed, ret_len); \ 1032 xstrcat(ret, needed, ret_len); \
688 } \ 1033 } \
689 *found_needed = 1; \ 1034 *found_needed = 1; \
690 } else { \ 1035 } else { \
691 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \ 1036 /* -N -> print matching entries */ \
1037 size_t n; \
1038 const char *find_lib_name; \
1039 \
1040 array_for_each(find_lib_arr, n, find_lib_name) { \
1041 int invert = 1; \
1042 if (find_lib_name[0] == '!') \
1043 invert = 0, ++find_lib_name; \
1044 if (!strcmp(find_lib_name, needed) == invert) \
1045 ++matched; \
1046 } \
1047 \
1048 if (matched == array_cnt(find_lib_arr)) { \
692 *found_lib = 1; \ 1049 *found_lib = 1; \
693 return (be_wewy_wewy_quiet ? NULL : needed); \ 1050 return (be_wewy_wewy_quiet ? NULL : find_lib); \
694 } \ 1051 } \
695 } \ 1052 } \
696 } \ 1053 } \
697 ++dyn; \ 1054 ++dyn; \
698 } \ 1055 } \
720 *found_interp = 1; \ 1077 *found_interp = 1; \
721 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \ 1078 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
722 } 1079 }
723 SHOW_INTERP(32) 1080 SHOW_INTERP(32)
724 SHOW_INTERP(64) 1081 SHOW_INTERP(64)
1082 } else {
1083 /* Walk all the program headers to find the PT_INTERP */
1084#define SHOW_PT_INTERP(B) \
1085 if (elf->elf_class == ELFCLASS ## B) { \
1086 unsigned long i; \
1087 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1088 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1089 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1090 if (EGET(phdr[i].p_type) != PT_INTERP) \
1091 continue; \
1092 *found_interp = 1; \
1093 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(phdr[i].p_offset)); \
1094 } \
725 } 1095 }
1096 SHOW_PT_INTERP(32)
1097 SHOW_PT_INTERP(64)
1098 }
1099
726 return NULL; 1100 return NULL;
727} 1101}
728static char *scanelf_file_bind(elfobj *elf, char *found_bind) 1102static const char *scanelf_file_bind(elfobj *elf, char *found_bind)
729{ 1103{
730 unsigned long i; 1104 unsigned long i;
731 struct stat s; 1105 struct stat s;
1106 bool dynamic = false;
732 1107
733 if (!show_bind) return NULL; 1108 if (!show_bind) return NULL;
734 if (!elf->phdr) return NULL; 1109 if (!elf->phdr) return NULL;
735 1110
736#define SHOW_BIND(B) \ 1111#define SHOW_BIND(B) \
738 Elf ## B ## _Dyn *dyn; \ 1113 Elf ## B ## _Dyn *dyn; \
739 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 1114 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
740 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 1115 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
741 Elf ## B ## _Off offset; \ 1116 Elf ## B ## _Off offset; \
742 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 1117 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
743 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 1118 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1119 dynamic = true; \
744 offset = EGET(phdr[i].p_offset); \ 1120 offset = EGET(phdr[i].p_offset); \
745 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 1121 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
746 dyn = DYN ## B (elf->data + offset); \ 1122 dyn = DYN ## B (elf->vdata + offset); \
747 while (EGET(dyn->d_tag) != DT_NULL) { \ 1123 while (EGET(dyn->d_tag) != DT_NULL) { \
748 if (EGET(dyn->d_tag) == DT_BIND_NOW || \ 1124 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
749 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \ 1125 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
750 { \ 1126 { \
751 if (be_quiet) return NULL; \ 1127 if (be_quiet) return NULL; \
759 SHOW_BIND(32) 1135 SHOW_BIND(32)
760 SHOW_BIND(64) 1136 SHOW_BIND(64)
761 1137
762 if (be_wewy_wewy_quiet) return NULL; 1138 if (be_wewy_wewy_quiet) return NULL;
763 1139
1140 /* don't output anything if quiet mode and the ELF is static or not setuid */
764 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) { 1141 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
765 return NULL; 1142 return NULL;
766 } else { 1143 } else {
767 *found_bind = 1; 1144 *found_bind = 1;
768 return (char *) "LAZY"; 1145 return dynamic ? "LAZY" : "STATIC";
769 } 1146 }
770} 1147}
771static char *scanelf_file_soname(elfobj *elf, char *found_soname) 1148static char *scanelf_file_soname(elfobj *elf, char *found_soname)
772{ 1149{
773 unsigned long i; 1150 unsigned long i;
785 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 1162 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
786 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 1163 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
787 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 1164 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
788 Elf ## B ## _Off offset; \ 1165 Elf ## B ## _Off offset; \
789 /* only look for soname in shared objects */ \ 1166 /* only look for soname in shared objects */ \
790 if (ehdr->e_type != ET_DYN) \ 1167 if (EGET(ehdr->e_type) != ET_DYN) \
791 return NULL; \ 1168 return NULL; \
792 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 1169 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
793 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 1170 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
794 offset = EGET(phdr[i].p_offset); \ 1171 offset = EGET(phdr[i].p_offset); \
795 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 1172 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
796 dyn = DYN ## B (elf->data + offset); \ 1173 dyn = DYN ## B (elf->vdata + offset); \
797 while (EGET(dyn->d_tag) != DT_NULL) { \ 1174 while (EGET(dyn->d_tag) != DT_NULL) { \
798 if (EGET(dyn->d_tag) == DT_SONAME) { \ 1175 if (EGET(dyn->d_tag) == DT_SONAME) { \
799 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 1176 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
800 if (offset >= (Elf ## B ## _Off)elf->len) { \ 1177 if (offset >= (Elf ## B ## _Off)elf->len) { \
801 ++dyn; \ 1178 ++dyn; \
802 continue; \ 1179 continue; \
803 } \ 1180 } \
804 soname = (char*)(elf->data + offset); \ 1181 soname = elf->data + offset; \
805 *found_soname = 1; \ 1182 *found_soname = 1; \
806 return (be_wewy_wewy_quiet ? NULL : soname); \ 1183 return (be_wewy_wewy_quiet ? NULL : soname); \
807 } \ 1184 } \
808 ++dyn; \ 1185 ++dyn; \
809 } \ 1186 } \
812 SHOW_SONAME(64) 1189 SHOW_SONAME(64)
813 } 1190 }
814 1191
815 return NULL; 1192 return NULL;
816} 1193}
1194
1195/*
1196 * We support the symbol form:
1197 * [%[modifiers]%][[+-]<symbol name>][,[.....]]
1198 * If the symbol name is empty, then all symbols are matched.
1199 * If the symbol name is a glob ("*"), then all symbols are dumped (debug).
1200 * Do not rely on this output format at all.
1201 * Otherwise the symbol name is used to search (either regex or string compare).
1202 * If the first char of the symbol name is a plus ("+"), then only match
1203 * defined symbols. If it's a minus ("-"), only match undefined symbols.
1204 * Putting modifiers in between the percent signs allows for more in depth
1205 * filters. There are groups of modifiers. If you don't specify a member
1206 * of a group, then all types in that group are matched. The current
1207 * groups and their types are:
1208 * STT group: STT_NOTYPE:n STT_OBJECT:o STT_FUNC:f STT_FILE:F
1209 * STB group: STB_LOCAL:l STB_GLOBAL:g STB_WEAK:w
1210 * STV group: STV_DEFAULT:p STV_INTERNAL:i STV_HIDDEN:h STV_PROTECTED:P
1211 * SHN group: SHN_UNDEF:u SHN_ABS:a SHN_COMMON:c {defined}:d
1212 * The "defined" value in the SHN group does not correspond to a SHN_xxx define.
1213 * You can search for multiple symbols at once by seperating with a comma (",").
1214 *
1215 * Some examples:
1216 * ELFs with a weak function "foo":
1217 * scanelf -s %wf%foo <ELFs>
1218 * ELFs that define the symbol "main":
1219 * scanelf -s +main <ELFs>
1220 * scanelf -s %d%main <ELFs>
1221 * ELFs that refer to the undefined symbol "brk":
1222 * scanelf -s -brk <ELFs>
1223 * scanelf -s %u%brk <ELFs>
1224 * All global defined objects in an ELF:
1225 * scanelf -s %ogd% <ELF>
1226 */
1227static void
1228scanelf_match_symname(elfobj *elf, char *found_sym, char **ret, size_t *ret_len, const char *symname,
1229 unsigned int stt, unsigned int stb, unsigned int stv, unsigned int shn, unsigned long size)
1230{
1231 const char *this_sym;
1232 size_t n;
1233
1234 array_for_each(find_sym_arr, n, this_sym) {
1235 bool inc_notype, inc_object, inc_func, inc_file,
1236 inc_local, inc_global, inc_weak,
1237 inc_visdef, inc_intern, inc_hidden, inc_prot,
1238 inc_def, inc_undef, inc_abs, inc_common;
1239
1240 /* symbol selection! */
1241 inc_notype = inc_object = inc_func = inc_file =
1242 inc_local = inc_global = inc_weak =
1243 inc_visdef = inc_intern = inc_hidden = inc_prot =
1244 inc_def = inc_undef = inc_abs = inc_common =
1245 (*this_sym != '%');
1246
1247 /* parse the contents of %...% */
1248 if (!inc_notype) {
1249 while (*(this_sym++)) {
1250 if (*this_sym == '%') {
1251 ++this_sym;
1252 break;
1253 }
1254 switch (*this_sym) {
1255 case 'n': inc_notype = true; break;
1256 case 'o': inc_object = true; break;
1257 case 'f': inc_func = true; break;
1258 case 'F': inc_file = true; break;
1259 case 'l': inc_local = true; break;
1260 case 'g': inc_global = true; break;
1261 case 'w': inc_weak = true; break;
1262 case 'p': inc_visdef = true; break;
1263 case 'i': inc_intern = true; break;
1264 case 'h': inc_hidden = true; break;
1265 case 'P': inc_prot = true; break;
1266 case 'd': inc_def = true; break;
1267 case 'u': inc_undef = true; break;
1268 case 'a': inc_abs = true; break;
1269 case 'c': inc_common = true; break;
1270 default: err("invalid symbol selector '%c'", *this_sym);
1271 }
1272 }
1273
1274 /* If no types are matched, not match all */
1275 if (!inc_notype && !inc_object && !inc_func && !inc_file)
1276 inc_notype = inc_object = inc_func = inc_file = true;
1277 if (!inc_local && !inc_global && !inc_weak)
1278 inc_local = inc_global = inc_weak = true;
1279 if (!inc_visdef && !inc_intern && !inc_hidden && !inc_prot)
1280 inc_visdef = inc_intern = inc_hidden = inc_prot = true;
1281 if (!inc_def && !inc_undef && !inc_abs && !inc_common)
1282 inc_def = inc_undef = inc_abs = inc_common = true;
1283
1284 /* backwards compat for defined/undefined short hand */
1285 } else if (*this_sym == '+') {
1286 inc_undef = false;
1287 ++this_sym;
1288 } else if (*this_sym == '-') {
1289 inc_def = inc_abs = inc_common = false;
1290 ++this_sym;
1291 }
1292
1293 /* filter symbols */
1294 if ((!inc_notype && stt == STT_NOTYPE ) || \
1295 (!inc_object && stt == STT_OBJECT ) || \
1296 (!inc_func && stt == STT_FUNC ) || \
1297 (!inc_file && stt == STT_FILE ) || \
1298 (!inc_local && stb == STB_LOCAL ) || \
1299 (!inc_global && stb == STB_GLOBAL ) || \
1300 (!inc_weak && stb == STB_WEAK ) || \
1301 (!inc_visdef && stv == STV_DEFAULT ) || \
1302 (!inc_intern && stv == STV_INTERNAL ) || \
1303 (!inc_hidden && stv == STV_HIDDEN ) || \
1304 (!inc_prot && stv == STV_PROTECTED) || \
1305 (!inc_def && shn && shn < SHN_LORESERVE) || \
1306 (!inc_undef && shn == SHN_UNDEF ) || \
1307 (!inc_abs && shn == SHN_ABS ) || \
1308 (!inc_common && shn == SHN_COMMON ))
1309 continue;
1310
1311 if (*this_sym == '*') {
1312 /* a "*" symbol gets you debug output */
1313 printf("%s(%s) %5lX %-15s %-15s %-15s %-15s %s\n",
1314 ((*found_sym == 0) ? "\n\t" : "\t"),
1315 elf->base_filename,
1316 size,
1317 get_elfstttype(stt),
1318 get_elfstbtype(stb),
1319 get_elfstvtype(stv),
1320 get_elfshntype(shn),
1321 symname);
1322 goto matched;
1323
1324 } else {
1325 if (g_match) {
1326 /* regex match the symbol */
1327 if (regexec(find_sym_regex_arr->eles[n], symname, 0, NULL, 0) == REG_NOMATCH)
1328 continue;
1329
1330 } else if (*this_sym) {
1331 /* give empty symbols a "pass", else do a normal compare */
1332 const size_t len = strlen(this_sym);
1333 if (!(strncmp(this_sym, symname, len) == 0 &&
1334 /* Accept unversioned symbol names */
1335 (symname[len] == '\0' || symname[len] == '@')))
1336 continue;
1337 }
1338
1339 if (be_semi_verbose) {
1340 char buf[1024];
1341 snprintf(buf, sizeof(buf), "%lX %s %s",
1342 size,
1343 get_elfstttype(stt),
1344 this_sym);
1345 *ret = xstrdup(buf);
1346 } else {
1347 if (*ret) xchrcat(ret, ',', ret_len);
1348 xstrcat(ret, symname, ret_len);
1349 }
1350
1351 goto matched;
1352 }
1353 }
1354
1355 return;
1356
1357 matched:
1358 *found_sym = 1;
1359}
1360
817static char *scanelf_file_sym(elfobj *elf, char *found_sym) 1361static const char *scanelf_file_sym(elfobj *elf, char *found_sym)
818{ 1362{
819 unsigned long i;
820 char *ret; 1363 char *ret;
821 void *symtab_void, *strtab_void; 1364 void *symtab_void, *strtab_void;
822 1365
823 if (!find_sym) return NULL; 1366 if (!find_sym) return NULL;
824 ret = find_sym; 1367 ret = NULL;
825 1368
826 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void); 1369 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
827 1370
828 if (symtab_void && strtab_void) { 1371 if (symtab_void && strtab_void) {
829#define FIND_SYM(B) \ 1372#define FIND_SYM(B) \
830 if (elf->elf_class == ELFCLASS ## B) { \ 1373 if (elf->elf_class == ELFCLASS ## B) { \
831 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 1374 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
832 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 1375 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
833 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 1376 Elf ## B ## _Sym *sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
834 unsigned long cnt = EGET(symtab->sh_entsize); \ 1377 Elf ## B ## _Word i, cnt = EGET(symtab->sh_entsize); \
835 char *symname; \ 1378 char *symname; \
1379 size_t ret_len = 0; \
836 if (cnt) \ 1380 if (cnt) \
837 cnt = EGET(symtab->sh_size) / cnt; \ 1381 cnt = EGET(symtab->sh_size) / cnt; \
838 for (i = 0; i < cnt; ++i) { \ 1382 for (i = 0; i < cnt; ++i) { \
1383 if ((void*)sym > elf->data_end) { \
1384 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1385 goto break_out; \
1386 } \
839 if (sym->st_name) { \ 1387 if (sym->st_name) { \
1388 /* make sure the symbol name is in acceptable memory range */ \
840 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 1389 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
841 if ((void*)symname > (void*)elf->data_end) { \ 1390 if ((void*)symname > elf->data_end) { \
842 warnf("%s: corrupt ELF symbols", elf->filename); \ 1391 warnf("%s: corrupt ELF symbols", elf->filename); \
1392 ++sym; \
843 continue; \ 1393 continue; \
844 } \ 1394 } \
845 if (*find_sym == '*') { \ 1395 scanelf_match_symname(elf, found_sym, \
846 printf("%s(%s) %5lX %15s %s\n", \ 1396 &ret, &ret_len, symname, \
847 ((*found_sym == 0) ? "\n\t" : "\t"), \ 1397 ELF##B##_ST_TYPE(EGET(sym->st_info)), \
848 elf->base_filename, \ 1398 ELF##B##_ST_BIND(EGET(sym->st_info)), \
849 (unsigned long)sym->st_size, \ 1399 ELF##B##_ST_VISIBILITY(EGET(sym->st_other)), \
850 get_elfstttype(sym->st_info), \ 1400 EGET(sym->st_shndx), \
851 symname); \ 1401 /* st_size can be 64bit, but no one is really that big, so screw em */ \
852 *found_sym = 1; \ 1402 EGET(sym->st_size)); \
853 } else { \
854 char *this_sym, *next_sym; \
855 this_sym = find_sym; \
856 do { \
857 next_sym = strchr(this_sym, ','); \
858 if (next_sym == NULL) \
859 next_sym = this_sym + strlen(this_sym); \
860 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
861 (strcmp(symname, versioned_symname) == 0)) { \
862 ret = this_sym; \
863 (*found_sym)++; \
864 goto break_out; \
865 } \
866 this_sym = next_sym + 1; \
867 } while (*next_sym != '\0'); \
868 } \
869 } \ 1403 } \
870 ++sym; \ 1404 ++sym; \
871 } } 1405 } \
1406 }
872 FIND_SYM(32) 1407 FIND_SYM(32)
873 FIND_SYM(64) 1408 FIND_SYM(64)
874 } 1409 }
875 1410
876break_out: 1411break_out:
879 if (*find_sym != '*' && *found_sym) 1414 if (*find_sym != '*' && *found_sym)
880 return ret; 1415 return ret;
881 if (be_quiet) 1416 if (be_quiet)
882 return NULL; 1417 return NULL;
883 else 1418 else
884 return (char *)" - "; 1419 return " - ";
885} 1420}
886 1421
887
888static char *scanelf_file_sections(elfobj *elf, char *found_section) 1422static const char *scanelf_file_sections(elfobj *elf, char *found_section)
889{ 1423{
890 if (!find_section) 1424 if (!find_section)
891 return NULL; 1425 return NULL;
892 1426
893#define FIND_SECTION(B) \ 1427#define FIND_SECTION(B) \
894 if (elf->elf_class == ELFCLASS ## B) { \ 1428 if (elf->elf_class == ELFCLASS ## B) { \
1429 size_t matched, n; \
1430 int invert; \
1431 const char *section_name; \
895 Elf ## B ## _Shdr *section; \ 1432 Elf ## B ## _Shdr *section; \
1433 \
1434 matched = 0; \
1435 array_for_each(find_section_arr, n, section_name) { \
1436 invert = (*section_name == '!' ? 1 : 0); \
896 section = SHDR ## B (elf_findsecbyname(elf, find_section)); \ 1437 section = SHDR ## B (elf_findsecbyname(elf, section_name + invert)); \
897 if (section != NULL) \ 1438 if ((section == NULL && invert) || (section != NULL && !invert)) \
1439 ++matched; \
1440 } \
1441 \
1442 if (matched == array_cnt(find_section_arr)) \
898 *found_section = 1; \ 1443 *found_section = 1; \
899 } 1444 }
900 FIND_SECTION(32) 1445 FIND_SECTION(32)
901 FIND_SECTION(64) 1446 FIND_SECTION(64)
902 1447
903
904 if (be_wewy_wewy_quiet) return NULL; 1448 if (be_wewy_wewy_quiet)
1449 return NULL;
905 1450
906 if (*found_section) 1451 if (*found_section)
907 return find_section; 1452 return find_section;
908 1453
909 if (be_quiet) 1454 if (be_quiet)
910 return NULL; 1455 return NULL;
911 else 1456 else
912 return (char *)" - "; 1457 return " - ";
913} 1458}
914 1459
915/* scan an elf file and show all the fun stuff */ 1460/* scan an elf file and show all the fun stuff */
916#define prints(str) write(fileno(stdout), str, strlen(str)) 1461#define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
917static int scanelf_elfobj(elfobj *elf) 1462static int scanelf_elfobj(elfobj *elf)
918{ 1463{
919 unsigned long i; 1464 unsigned long i;
920 char found_pax, found_phdr, found_relro, found_load, found_textrel, 1465 char found_pax, found_phdr, found_relro, found_load, found_textrel,
921 found_rpath, found_needed, found_interp, found_bind, found_soname, 1466 found_rpath, found_needed, found_interp, found_bind, found_soname,
922 found_sym, found_lib, found_file, found_textrels, found_section; 1467 found_sym, found_lib, found_file, found_textrels, found_section;
923 static char *out_buffer = NULL; 1468 static char *out_buffer = NULL;
924 static size_t out_len; 1469 static size_t out_len;
925 1470
926 found_pax = found_phdr = found_relro = found_load = found_textrel = \ 1471 found_pax = found_phdr = found_relro = found_load = found_textrel = \
935 printf("%s: scanning file\n", elf->filename); 1480 printf("%s: scanning file\n", elf->filename);
936 1481
937 /* init output buffer */ 1482 /* init output buffer */
938 if (!out_buffer) { 1483 if (!out_buffer) {
939 out_len = sizeof(char) * 80; 1484 out_len = sizeof(char) * 80;
940 out_buffer = (char*)xmalloc(out_len); 1485 out_buffer = xmalloc(out_len);
941 } 1486 }
942 *out_buffer = '\0'; 1487 *out_buffer = '\0';
943 1488
944 /* show the header */ 1489 /* show the header */
945 if (!be_quiet && show_banner) { 1490 if (!be_quiet && show_banner) {
946 for (i = 0; out_format[i]; ++i) { 1491 for (i = 0; out_format[i]; ++i) {
947 if (!IS_MODIFIER(out_format[i])) continue; 1492 if (!IS_MODIFIER(out_format[i])) continue;
948 1493
949 switch (out_format[++i]) { 1494 switch (out_format[++i]) {
1495 case '+': break;
950 case '%': break; 1496 case '%': break;
951 case '#': break; 1497 case '#': break;
952 case 'F': 1498 case 'F':
953 case 'p': 1499 case 'p':
954 case 'f': prints("FILE "); found_file = 1; break; 1500 case 'f': prints("FILE "); found_file = 1; break;
955 case 'o': prints(" TYPE "); break; 1501 case 'o': prints(" TYPE "); break;
956 case 'x': prints(" PAX "); break; 1502 case 'x': prints(" PAX "); break;
957 case 'e': prints("STK/REL/PTL "); break; 1503 case 'e': prints("STK/REL/PTL "); break;
958 case 't': prints("TEXTREL "); break; 1504 case 't': prints("TEXTREL "); break;
959 case 'r': prints("RPATH "); break; 1505 case 'r': prints("RPATH "); break;
1506 case 'M': prints("CLASS "); break;
1507 case 'l':
960 case 'n': prints("NEEDED "); break; 1508 case 'n': prints("NEEDED "); break;
961 case 'i': prints("INTERP "); break; 1509 case 'i': prints("INTERP "); break;
962 case 'b': prints("BIND "); break; 1510 case 'b': prints("BIND "); break;
1511 case 'Z': prints("SIZE "); break;
963 case 'S': prints("SONAME "); break; 1512 case 'S': prints("SONAME "); break;
964 case 's': prints("SYM "); break; 1513 case 's': prints("SYM "); break;
965 case 'N': prints("LIB "); break; 1514 case 'N': prints("LIB "); break;
966 case 'T': prints("TEXTRELS "); break; 1515 case 'T': prints("TEXTRELS "); break;
967 case 'k': prints("SECTION "); break; 1516 case 'k': prints("SECTION "); break;
1517 case 'a': prints("ARCH "); break;
1518 case 'I': prints("OSABI "); break;
1519 case 'Y': prints("EABI "); break;
1520 case 'O': prints("PERM "); break;
1521 case 'D': prints("ENDIAN "); break;
968 default: warnf("'%c' has no title ?", out_format[i]); 1522 default: warnf("'%c' has no title ?", out_format[i]);
969 } 1523 }
970 } 1524 }
971 if (!found_file) prints("FILE "); 1525 if (!found_file) prints("FILE ");
972 prints("\n"); 1526 prints("\n");
976 1530
977 /* dump all the good stuff */ 1531 /* dump all the good stuff */
978 for (i = 0; out_format[i]; ++i) { 1532 for (i = 0; out_format[i]; ++i) {
979 const char *out; 1533 const char *out;
980 const char *tmp; 1534 const char *tmp;
981 1535 static char ubuf[sizeof(unsigned long)*2];
982 if (!IS_MODIFIER(out_format[i])) { 1536 if (!IS_MODIFIER(out_format[i])) {
983 xchrcat(&out_buffer, out_format[i], &out_len); 1537 xchrcat(&out_buffer, out_format[i], &out_len);
984 continue; 1538 continue;
985 } 1539 }
986 1540
987 out = NULL; 1541 out = NULL;
988 be_wewy_wewy_quiet = (out_format[i] == '#'); 1542 be_wewy_wewy_quiet = (out_format[i] == '#');
1543 be_semi_verbose = (out_format[i] == '+');
989 switch (out_format[++i]) { 1544 switch (out_format[++i]) {
1545 case '+':
990 case '%': 1546 case '%':
991 case '#': 1547 case '#':
992 xchrcat(&out_buffer, out_format[i], &out_len); break; 1548 xchrcat(&out_buffer, out_format[i], &out_len); break;
993 case 'F': 1549 case 'F':
994 found_file = 1; 1550 found_file = 1;
1020 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1576 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
1021 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break; 1577 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
1022 case 't': out = scanelf_file_textrel(elf, &found_textrel); break; 1578 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1023 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break; 1579 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
1024 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break; 1580 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1581 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1582 case 'D': out = get_endian(elf); break;
1583 case 'O': out = strfileperms(elf->filename); break;
1025 case 'n': 1584 case 'n':
1026 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break; 1585 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
1027 case 'i': out = scanelf_file_interp(elf, &found_interp); break; 1586 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1028 case 'b': out = scanelf_file_bind(elf, &found_bind); break; 1587 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1029 case 'S': out = scanelf_file_soname(elf, &found_soname); break; 1588 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
1030 case 's': out = scanelf_file_sym(elf, &found_sym); break; 1589 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1031 case 'k': out = scanelf_file_sections(elf, &found_section); break; 1590 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1591 case 'a': out = get_elfemtype(elf); break;
1592 case 'I': out = get_elfosabi(elf); break;
1593 case 'Y': out = get_elf_eabi(elf); break;
1594 case 'Z': snprintf(ubuf, sizeof(ubuf), "%lu", (unsigned long)elf->len); out = ubuf; break;;
1032 default: warnf("'%c' has no scan code?", out_format[i]); 1595 default: warnf("'%c' has no scan code?", out_format[i]);
1033 } 1596 }
1034 if (out) { 1597 if (out)
1035 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
1036 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
1037 xstrncat(&out_buffer, out, &out_len, (tmp-out));
1038 else
1039 xstrcat(&out_buffer, out, &out_len); 1598 xstrcat(&out_buffer, out, &out_len);
1040 }
1041 } 1599 }
1042 1600
1043#define FOUND_SOMETHING() \ 1601#define FOUND_SOMETHING() \
1044 (found_pax || found_phdr || found_relro || found_load || found_textrel || \ 1602 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1045 found_rpath || found_needed || found_interp || found_bind || \ 1603 found_rpath || found_needed || found_interp || found_bind || \
1059 1617
1060/* scan a single elf */ 1618/* scan a single elf */
1061static int scanelf_elf(const char *filename, int fd, size_t len) 1619static int scanelf_elf(const char *filename, int fd, size_t len)
1062{ 1620{
1063 int ret = 1; 1621 int ret = 1;
1622 size_t n;
1623 const char *match_etype;
1064 elfobj *elf; 1624 elfobj *elf;
1065 1625
1066 /* verify this is real ELF */ 1626 /* Verify this is a real ELF */
1067 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) { 1627 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1068 if (be_verbose > 2) printf("%s: not an ELF\n", filename); 1628 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1069 return ret; 1629 return 2;
1070 } 1630 }
1631
1632 /* Possibly filter based on ELF bitness */
1071 switch (match_bits) { 1633 switch (match_bits) {
1072 case 32: 1634 case 32:
1073 if (elf->elf_class != ELFCLASS32) 1635 if (elf->elf_class != ELFCLASS32)
1074 goto label_done; 1636 goto done;
1075 break; 1637 break;
1076 case 64: 1638 case 64:
1077 if (elf->elf_class != ELFCLASS64) 1639 if (elf->elf_class != ELFCLASS64)
1078 goto label_done; 1640 goto done;
1079 break; 1641 break;
1080 default: break;
1081 }
1082 if (strlen(match_etypes)) {
1083 char sbuf[126];
1084 strncpy(sbuf, match_etypes, sizeof(sbuf));
1085 if (strchr(match_etypes, ',') != NULL) {
1086 char *p;
1087 while((p = strrchr(sbuf, ',')) != NULL) {
1088 *p = 0;
1089 if (atoi(p+1) == get_etype(elf))
1090 goto label_ret;
1091 }
1092 } 1642 }
1093 if (atoi(sbuf) != get_etype(elf)) 1643
1644 /* Possibly filter based on the ELF's e_type field */
1645 array_for_each(match_etypes, n, match_etype)
1646 if (etype_lookup(match_etype) == get_etype(elf))
1647 goto scanit;
1648 if (array_cnt(match_etypes))
1094 goto label_done; 1649 goto done;
1095 }
1096 1650
1097label_ret: 1651 scanit:
1098 ret = scanelf_elfobj(elf); 1652 ret = scanelf_elfobj(elf);
1099 1653
1100label_done: 1654 done:
1101 unreadelf(elf); 1655 unreadelf(elf);
1102 return ret; 1656 return ret;
1103} 1657}
1104 1658
1105/* scan an archive of elfs */ 1659/* scan an archive of elfs */
1112 1666
1113 ar = ar_open_fd(filename, fd); 1667 ar = ar_open_fd(filename, fd);
1114 if (ar == NULL) 1668 if (ar == NULL)
1115 return 1; 1669 return 1;
1116 1670
1117 ar_buffer = (char*)mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0); 1671 ar_buffer = mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1118 while ((m=ar_next(ar)) != NULL) { 1672 while ((m = ar_next(ar)) != NULL) {
1673 off_t cur_pos = lseek(fd, 0, SEEK_CUR);
1674 if (cur_pos == -1)
1675 errp("lseek() failed");
1119 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size); 1676 elf = readelf_buffer(m->name, ar_buffer + cur_pos, m->size);
1120 if (elf) { 1677 if (elf) {
1121 scanelf_elfobj(elf); 1678 scanelf_elfobj(elf);
1122 unreadelf(elf); 1679 unreadelf(elf);
1123 } 1680 }
1124 } 1681 }
1125 munmap(ar_buffer, len); 1682 munmap(ar_buffer, len);
1126 1683
1127 return 0; 1684 return 0;
1128} 1685}
1129/* scan a file which may be an elf or an archive or some other magical beast */ 1686/* scan a file which may be an elf or an archive or some other magical beast */
1130static void scanelf_file(const char *filename) 1687static int scanelf_fileat(int dir_fd, const char *filename, const struct stat *st_cache)
1131{ 1688{
1689 const struct stat *st = st_cache;
1132 struct stat st; 1690 struct stat symlink_st;
1133 int fd; 1691 int fd;
1134 1692
1135 /* make sure 'filename' exists */
1136 if (lstat(filename, &st) == -1) {
1137 if (be_verbose > 2) printf("%s: does not exist\n", filename);
1138 return;
1139 }
1140
1141 /* always handle regular files and handle symlinked files if no -y */ 1693 /* always handle regular files and handle symlinked files if no -y */
1142 if (S_ISLNK(st.st_mode)) { 1694 if (S_ISLNK(st->st_mode)) {
1143 if (!scan_symlink) return; 1695 if (!scan_symlink)
1144 stat(filename, &st); 1696 return 1;
1697 fstatat(dir_fd, filename, &symlink_st, 0);
1698 st = &symlink_st;
1145 } 1699 }
1700
1146 if (!S_ISREG(st.st_mode)) { 1701 if (!S_ISREG(st->st_mode)) {
1147 if (be_verbose > 2) printf("%s: skipping non-file\n", filename); 1702 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1148 return; 1703 return 1;
1149 } 1704 }
1150 1705
1151 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1) 1706 if (match_perms) {
1707 if ((st->st_mode | match_perms) != st->st_mode)
1708 return 1;
1709 }
1710 fd = openat(dir_fd, filename, (fix_elf ? O_RDWR : O_RDONLY) | O_CLOEXEC);
1711 if (fd == -1) {
1712 if (fix_elf && errno == ETXTBSY)
1713 warnp("%s: could not fix", filename);
1714 else if (be_verbose > 2)
1715 printf("%s: skipping file: %s\n", filename, strerror(errno));
1152 return; 1716 return 1;
1717 }
1153 1718
1154 if (scanelf_elf(filename, fd, st.st_size) == 1 && scan_archives) 1719 if (scanelf_elf(filename, fd, st->st_size) == 2) {
1155 /* if it isn't an ELF, maybe it's an .a archive */ 1720 /* if it isn't an ELF, maybe it's an .a archive */
1721 if (scan_archives)
1156 scanelf_archive(filename, fd, st.st_size); 1722 scanelf_archive(filename, fd, st->st_size);
1157 1723
1724 /*
1725 * unreadelf() implicitly closes its fd, so only close it
1726 * when we are returning it in the non-ELF case
1727 */
1158 close(fd); 1728 close(fd);
1729 }
1730
1731 return 0;
1159} 1732}
1160 1733
1161/* scan a directory for ET_EXEC files and print when we find one */ 1734/* scan a directory for ET_EXEC files and print when we find one */
1162static void scanelf_dir(const char *path) 1735static int scanelf_dirat(int dir_fd, const char *path)
1163{ 1736{
1164 register DIR *dir; 1737 register DIR *dir;
1165 register struct dirent *dentry; 1738 register struct dirent *dentry;
1166 struct stat st_top, st; 1739 struct stat st_top, st;
1167 char buf[__PAX_UTILS_PATH_MAX]; 1740 char buf[__PAX_UTILS_PATH_MAX], *subpath;
1168 size_t pathlen = 0, len = 0; 1741 size_t pathlen = 0, len = 0;
1742 int ret = 0;
1743 int subdir_fd;
1169 1744
1170 /* make sure path exists */ 1745 /* make sure path exists */
1171 if (lstat(path, &st_top) == -1) { 1746 if (fstatat(dir_fd, path, &st_top, AT_SYMLINK_NOFOLLOW) == -1) {
1172 if (be_verbose > 2) printf("%s: does not exist\n", path); 1747 if (be_verbose > 2) printf("%s: does not exist\n", path);
1173 return; 1748 return 1;
1174 } 1749 }
1175 1750
1176 /* ok, if it isn't a directory, assume we can open it */ 1751 /* ok, if it isn't a directory, assume we can open it */
1177 if (!S_ISDIR(st_top.st_mode)) { 1752 if (!S_ISDIR(st_top.st_mode))
1178 scanelf_file(path); 1753 return scanelf_fileat(dir_fd, path, &st_top);
1179 return;
1180 }
1181 1754
1182 /* now scan the dir looking for fun stuff */ 1755 /* now scan the dir looking for fun stuff */
1183 if ((dir = opendir(path)) == NULL) { 1756 subdir_fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
1184 warnf("could not opendir %s: %s", path, strerror(errno)); 1757 if (subdir_fd == -1)
1758 dir = NULL;
1759 else
1760 dir = fdopendir(subdir_fd);
1761 if (dir == NULL) {
1762 if (subdir_fd != -1)
1763 close(subdir_fd);
1764 else if (be_verbose > 2)
1765 printf("%s: skipping dir: %s\n", path, strerror(errno));
1185 return; 1766 return 1;
1186 } 1767 }
1187 if (be_verbose > 1) printf("%s: scanning dir\n", path); 1768 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1188 1769
1189 pathlen = strlen(path); 1770 subpath = stpcpy(buf, path);
1771 if (subpath[-1] != '/')
1772 *subpath++ = '/';
1773 pathlen = subpath - buf;
1190 while ((dentry = readdir(dir))) { 1774 while ((dentry = readdir(dir))) {
1191 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1775 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1192 continue; 1776 continue;
1777
1778 if (fstatat(subdir_fd, dentry->d_name, &st, AT_SYMLINK_NOFOLLOW) == -1)
1779 continue;
1780
1193 len = (pathlen + 1 + strlen(dentry->d_name) + 1); 1781 len = strlen(dentry->d_name);
1194 if (len >= sizeof(buf)) { 1782 if (len + pathlen + 1 >= sizeof(buf)) {
1195 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path, 1783 warnf("Skipping '%s%s': len > sizeof(buf); %zu > %zu\n",
1196 (unsigned long)len, (unsigned long)sizeof(buf)); 1784 path, dentry->d_name, len + pathlen + 1, sizeof(buf));
1197 continue; 1785 continue;
1198 } 1786 }
1199 sprintf(buf, "%s/%s", path, dentry->d_name); 1787 memcpy(subpath, dentry->d_name, len);
1200 if (lstat(buf, &st) != -1) { 1788 subpath[len] = '\0';
1789
1201 if (S_ISREG(st.st_mode)) 1790 if (S_ISREG(st.st_mode))
1202 scanelf_file(buf); 1791 ret = scanelf_fileat(dir_fd, buf, &st);
1203 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1792 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1204 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1793 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1205 scanelf_dir(buf); 1794 ret = scanelf_dirat(dir_fd, buf);
1206 }
1207 } 1795 }
1208 } 1796 }
1209 closedir(dir); 1797 closedir(dir);
1210}
1211 1798
1799 return ret;
1800}
1801static int scanelf_dir(const char *path)
1802{
1803 return scanelf_dirat(root_fd, root_rel_path(path));
1804}
1805
1212static int scanelf_from_file(char *filename) 1806static int scanelf_from_file(const char *filename)
1213{ 1807{
1214 FILE *fp = NULL; 1808 FILE *fp;
1215 char *p; 1809 char *p, *path;
1216 char path[__PAX_UTILS_PATH_MAX]; 1810 size_t len;
1811 int ret;
1217 1812
1218 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL)) 1813 if (strcmp(filename, "-") == 0)
1219 fp = stdin; 1814 fp = stdin;
1220 else if ((fp = fopen(filename, "r")) == NULL) 1815 else if ((fp = fopen(filename, "r")) == NULL)
1221 return 1; 1816 return 1;
1222 1817
1223 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) { 1818 path = NULL;
1819 len = 0;
1820 ret = 0;
1821 while (getline(&path, &len, fp) != -1) {
1224 if ((p = strchr(path, '\n')) != NULL) 1822 if ((p = strchr(path, '\n')) != NULL)
1225 *p = 0; 1823 *p = 0;
1226 search_path = path; 1824 search_path = path;
1227 scanelf_dir(path); 1825 ret = scanelf_dir(path);
1228 } 1826 }
1827 free(path);
1828
1229 if (fp != stdin) 1829 if (fp != stdin)
1230 fclose(fp); 1830 fclose(fp);
1831
1231 return 0; 1832 return ret;
1232} 1833}
1233 1834
1835#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1836
1234static int load_ld_so_conf(int i, const char *fname) 1837static int _load_ld_cache_config(const char *fname)
1235{ 1838{
1236 FILE *fp = NULL; 1839 FILE *fp = NULL;
1237 char *p; 1840 char *p, *path;
1238 char path[__PAX_UTILS_PATH_MAX]; 1841 size_t len;
1842 int curr_fd = -1;
1239 1843
1240 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths)) 1844 fp = fopenat_r(root_fd, root_rel_path(fname));
1845 if (fp == NULL)
1241 return i; 1846 return -1;
1242 1847
1243 if ((fp = fopen(fname, "r")) == NULL) 1848 path = NULL;
1244 return i; 1849 len = 0;
1245 1850 while (getline(&path, &len, fp) != -1) {
1246 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1247 if ((p = strrchr(path, '\r')) != NULL) 1851 if ((p = strrchr(path, '\r')) != NULL)
1248 *p = 0; 1852 *p = 0;
1249 if ((p = strchr(path, '\n')) != NULL) 1853 if ((p = strchr(path, '\n')) != NULL)
1250 *p = 0; 1854 *p = 0;
1251#ifdef HAVE_GLOB 1855
1252 // recursive includes of the same file will make this segfault. 1856 /* recursive includes of the same file will make this segfault. */
1253 if ((*path == 'i') && (strncmp(path, "include", 7) == 0) && isblank(path[7])) { 1857 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1254 glob64_t gl; 1858 glob_t gl;
1255 size_t x; 1859 size_t x;
1256 char gpath[__PAX_UTILS_PATH_MAX]; 1860 const char *gpath;
1257 1861
1258 gpath[sizeof(gpath)] = 0; 1862 /* re-use existing path buffer ... need to be creative */
1259
1260 if (path[8] != '/') 1863 if (path[8] != '/')
1261 snprintf(gpath, sizeof(gpath)-1, "/etc/%s", &path[8]); 1864 gpath = memcpy(path + 3, "/etc/", 5);
1262 else 1865 else
1263 strncpy(gpath, &path[8], sizeof(gpath)-1); 1866 gpath = path + 8;
1867 if (root_fd != AT_FDCWD) {
1868 if (curr_fd == -1) {
1869 curr_fd = open(".", O_RDONLY|O_CLOEXEC);
1870 if (fchdir(root_fd))
1871 errp("unable to change to root dir");
1872 }
1873 gpath = root_rel_path(gpath);
1874 }
1264 1875
1265 if ((glob64(gpath, 0, NULL, &gl)) == 0) { 1876 if (glob(gpath, 0, NULL, &gl) == 0) {
1266 for (x = 0; x < gl.gl_pathc; ++x) { 1877 for (x = 0; x < gl.gl_pathc; ++x) {
1267 /* try to avoid direct loops */ 1878 /* try to avoid direct loops */
1268 if (strcmp(gl.gl_pathv[x], fname) == 0) 1879 if (strcmp(gl.gl_pathv[x], fname) == 0)
1269 continue; 1880 continue;
1270 i = load_ld_so_conf(i, gl.gl_pathv[x]); 1881 _load_ld_cache_config(gl.gl_pathv[x]);
1271 if (i + 1 >= sizeof(ldpaths) / sizeof(*ldpaths)) {
1272 globfree64(&gl);
1273 return i;
1274 }
1275 } 1882 }
1276 globfree64 (&gl); 1883 globfree(&gl);
1884 }
1885
1886 /* failed globs are ignored by glibc */
1277 continue; 1887 continue;
1278 } else
1279 abort();
1280 } 1888 }
1281#endif 1889
1282 if (*path != '/') 1890 if (*path != '/')
1283 continue; 1891 continue;
1284 1892
1285 ldpaths[i++] = xstrdup(path); 1893 xarraypush_str(ldpaths, path);
1286
1287 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
1288 break;
1289 } 1894 }
1290 ldpaths[i] = NULL; 1895 free(path);
1291 1896
1292 fclose(fp); 1897 fclose(fp);
1898
1899 if (curr_fd != -1) {
1900 if (fchdir(curr_fd))
1901 {/* don't care */}
1902 close(curr_fd);
1903 }
1904
1293 return i; 1905 return 0;
1906}
1907
1908#elif defined(__FreeBSD__) || defined(__DragonFly__)
1909
1910static int _load_ld_cache_config(const char *fname)
1911{
1912 FILE *fp = NULL;
1913 char *b = NULL, *p;
1914 struct elfhints_hdr hdr;
1915
1916 fp = fopenat_r(root_fd, root_rel_path(fname));
1917 if (fp == NULL)
1918 return -1;
1919
1920 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1921 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1922 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1923 {
1924 fclose(fp);
1925 return -1;
1926 }
1927
1928 b = xmalloc(hdr.dirlistlen + 1);
1929 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1930 fclose(fp);
1931 free(b);
1932 return -1;
1933 }
1934
1935 while ((p = strsep(&b, ":"))) {
1936 if (*p == '\0')
1937 continue;
1938 xarraypush_str(ldpaths, p);
1939 }
1940
1941 free(b);
1942 fclose(fp);
1943 return 0;
1944}
1945
1946#else
1947#ifdef __ELF__
1948#warning Cache config support not implemented for your target
1949#endif
1950static int _load_ld_cache_config(const char *fname)
1951{
1952 return 0;
1953}
1954#endif
1955
1956static void load_ld_cache_config(const char *fname)
1957{
1958 bool scan_l, scan_ul, scan_ull;
1959 size_t n;
1960 const char *ldpath;
1961
1962 _load_ld_cache_config(fname);
1963
1964 scan_l = scan_ul = scan_ull = false;
1965 array_for_each(ldpaths, n, ldpath) {
1966 if (!scan_l && !strcmp(ldpath, "/lib")) scan_l = true;
1967 if (!scan_ul && !strcmp(ldpath, "/usr/lib")) scan_ul = true;
1968 if (!scan_ull && !strcmp(ldpath, "/usr/local/lib")) scan_ull = true;
1969 }
1970
1971 if (!scan_l) xarraypush_str(ldpaths, "/lib");
1972 if (!scan_ul) xarraypush_str(ldpaths, "/usr/lib");
1973 if (!scan_ull) xarraypush_str(ldpaths, "/usr/local/lib");
1294} 1974}
1295 1975
1296/* scan /etc/ld.so.conf for paths */ 1976/* scan /etc/ld.so.conf for paths */
1297static void scanelf_ldpath() 1977static void scanelf_ldpath(void)
1298{ 1978{
1299 char scan_l, scan_ul, scan_ull; 1979 size_t n;
1300 int i = 0; 1980 const char *ldpath;
1301 1981
1302 if (!ldpaths[0]) 1982 array_for_each(ldpaths, n, ldpath)
1303 err("Unable to load any paths from ld.so.conf");
1304
1305 scan_l = scan_ul = scan_ull = 0;
1306
1307 while (ldpaths[i]) {
1308 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
1309 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
1310 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
1311 scanelf_dir(ldpaths[i]); 1983 scanelf_dir(ldpath);
1312 ++i;
1313 }
1314
1315 if (!scan_l) scanelf_dir("/lib");
1316 if (!scan_ul) scanelf_dir("/usr/lib");
1317 if (!scan_ull) scanelf_dir("/usr/local/lib");
1318} 1984}
1319 1985
1320/* scan env PATH for paths */ 1986/* scan env PATH for paths */
1321static void scanelf_envpath() 1987static void scanelf_envpath(void)
1322{ 1988{
1323 char *path, *p; 1989 char *path, *p;
1324 1990
1325 path = getenv("PATH"); 1991 path = getenv("PATH");
1326 if (!path) 1992 if (!path)
1333 } 1999 }
1334 2000
1335 free(path); 2001 free(path);
1336} 2002}
1337 2003
1338/* usage / invocation handling functions */ 2004/* usage / invocation handling functions */ /* Free Flags: c d j u w G H J K P Q U W */
1339#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:BhV" 2005#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZCBhV"
1340#define a_argument required_argument 2006#define a_argument required_argument
1341static struct option const long_opts[] = { 2007static struct option const long_opts[] = {
1342 {"path", no_argument, NULL, 'p'}, 2008 {"path", no_argument, NULL, 'p'},
1343 {"ldpath", no_argument, NULL, 'l'}, 2009 {"ldpath", no_argument, NULL, 'l'},
2010 {"use-ldpath",no_argument, NULL, 129},
2011 {"root", a_argument, NULL, 128},
1344 {"recursive", no_argument, NULL, 'R'}, 2012 {"recursive", no_argument, NULL, 'R'},
1345 {"mount", no_argument, NULL, 'm'}, 2013 {"mount", no_argument, NULL, 'm'},
1346 {"symlink", no_argument, NULL, 'y'}, 2014 {"symlink", no_argument, NULL, 'y'},
1347 {"archives", no_argument, NULL, 'A'}, 2015 {"archives", no_argument, NULL, 'A'},
1348 {"ldcache", no_argument, NULL, 'L'}, 2016 {"ldcache", no_argument, NULL, 'L'},
1361 {"lib", a_argument, NULL, 'N'}, 2029 {"lib", a_argument, NULL, 'N'},
1362 {"gmatch", no_argument, NULL, 'g'}, 2030 {"gmatch", no_argument, NULL, 'g'},
1363 {"textrels", no_argument, NULL, 'T'}, 2031 {"textrels", no_argument, NULL, 'T'},
1364 {"etype", a_argument, NULL, 'E'}, 2032 {"etype", a_argument, NULL, 'E'},
1365 {"bits", a_argument, NULL, 'M'}, 2033 {"bits", a_argument, NULL, 'M'},
2034 {"endian", no_argument, NULL, 'D'},
2035 {"osabi", no_argument, NULL, 'I'},
2036 {"eabi", no_argument, NULL, 'Y'},
2037 {"perms", a_argument, NULL, 'O'},
2038 {"size", no_argument, NULL, 'Z'},
1366 {"all", no_argument, NULL, 'a'}, 2039 {"all", no_argument, NULL, 'a'},
1367 {"quiet", no_argument, NULL, 'q'}, 2040 {"quiet", no_argument, NULL, 'q'},
1368 {"verbose", no_argument, NULL, 'v'}, 2041 {"verbose", no_argument, NULL, 'v'},
1369 {"format", a_argument, NULL, 'F'}, 2042 {"format", a_argument, NULL, 'F'},
1370 {"from", a_argument, NULL, 'f'}, 2043 {"from", a_argument, NULL, 'f'},
1371 {"file", a_argument, NULL, 'o'}, 2044 {"file", a_argument, NULL, 'o'},
2045 {"nocolor", no_argument, NULL, 'C'},
1372 {"nobanner", no_argument, NULL, 'B'}, 2046 {"nobanner", no_argument, NULL, 'B'},
1373 {"help", no_argument, NULL, 'h'}, 2047 {"help", no_argument, NULL, 'h'},
1374 {"version", no_argument, NULL, 'V'}, 2048 {"version", no_argument, NULL, 'V'},
1375 {NULL, no_argument, NULL, 0x0} 2049 {NULL, no_argument, NULL, 0x0}
1376}; 2050};
1377 2051
1378static const char *opts_help[] = { 2052static const char * const opts_help[] = {
1379 "Scan all directories in PATH environment", 2053 "Scan all directories in PATH environment",
1380 "Scan all directories in /etc/ld.so.conf", 2054 "Scan all directories in /etc/ld.so.conf",
2055 "Use ld.so.conf to show full path (use with -r/-n)",
2056 "Root directory (use with -l or -p)",
1381 "Scan directories recursively", 2057 "Scan directories recursively",
1382 "Don't recursively cross mount points", 2058 "Don't recursively cross mount points",
1383 "Don't scan symlinks", 2059 "Don't scan symlinks",
1384 "Scan archives (.a files)", 2060 "Scan archives (.a files)",
1385 "Utilize ld.so.cache information (use with -r/-n)", 2061 "Utilize ld.so.cache to show full path (use with -r/-n)",
1386 "Try and 'fix' bad things (use with -r/-e)", 2062 "Try and 'fix' bad things (use with -r/-e)",
1387 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n", 2063 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1388 "Print PaX markings", 2064 "Print PaX markings",
1389 "Print GNU_STACK/PT_LOAD markings", 2065 "Print GNU_STACK/PT_LOAD markings",
1390 "Print TEXTREL information", 2066 "Print TEXTREL information",
1394 "Print BIND information", 2070 "Print BIND information",
1395 "Print SONAME information", 2071 "Print SONAME information",
1396 "Find a specified symbol", 2072 "Find a specified symbol",
1397 "Find a specified section", 2073 "Find a specified section",
1398 "Find a specified library", 2074 "Find a specified library",
1399 "Use strncmp to match libraries. (use with -N)", 2075 "Use regex rather than string compare (with -s); specify twice for case insensitive",
1400 "Locate cause of TEXTREL", 2076 "Locate cause of TEXTREL",
1401 "Print only ELF files matching numeric constant type", 2077 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1402 "Print only ELF files matching numeric bits", 2078 "Print only ELF files matching numeric bits",
1403 "Print all scanned info (-x -e -t -r -b)\n", 2079 "Print Endianness",
2080 "Print OSABI",
2081 "Print EABI (EM_ARM Only)",
2082 "Print only ELF files matching octal permissions",
2083 "Print ELF file size",
2084 "Print all useful/simple info\n",
1404 "Only output 'bad' things", 2085 "Only output 'bad' things",
1405 "Be verbose (can be specified more than once)", 2086 "Be verbose (can be specified more than once)",
1406 "Use specified format for output", 2087 "Use specified format for output",
1407 "Read input stream from a filename", 2088 "Read input stream from a filename",
1408 "Write output stream to a filename", 2089 "Write output stream to a filename",
2090 "Don't emit color in output",
1409 "Don't display the header", 2091 "Don't display the header",
1410 "Print this help and exit", 2092 "Print this help and exit",
1411 "Print version and exit", 2093 "Print version and exit",
1412 NULL 2094 NULL
1413}; 2095};
1414 2096
1415/* display usage and exit */ 2097/* display usage and exit */
1416static void usage(int status) 2098static void usage(int status)
1417{ 2099{
1418 unsigned long i; 2100 const char a_arg[] = "<arg>";
2101 size_t a_arg_len = strlen(a_arg) + 2;
2102 size_t i;
2103 int optlen;
1419 printf("* Scan ELF binaries for stuff\n\n" 2104 printf("* Scan ELF binaries for stuff\n\n"
1420 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0); 2105 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1421 printf("Options: -[%s]\n", PARSE_FLAGS); 2106 printf("Options: -[%s]\n", PARSE_FLAGS);
2107
2108 /* prescan the --long opt length to auto-align */
2109 optlen = 0;
1422 for (i = 0; long_opts[i].name; ++i) 2110 for (i = 0; long_opts[i].name; ++i) {
2111 int l = strlen(long_opts[i].name);
2112 if (long_opts[i].has_arg == a_argument)
2113 l += a_arg_len;
2114 optlen = max(l, optlen);
2115 }
2116
2117 for (i = 0; long_opts[i].name; ++i) {
2118 /* first output the short flag if it has one */
2119 if (long_opts[i].val > '~')
2120 printf(" ");
2121 else
2122 printf(" -%c, ", long_opts[i].val);
2123
2124 /* then the long flag */
1423 if (long_opts[i].has_arg == no_argument) 2125 if (long_opts[i].has_arg == no_argument)
1424 printf(" -%c, --%-14s* %s\n", long_opts[i].val, 2126 printf("--%-*s", optlen, long_opts[i].name);
1425 long_opts[i].name, opts_help[i]);
1426 else 2127 else
1427 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val, 2128 printf("--%s %s %*s", long_opts[i].name, a_arg,
1428 long_opts[i].name, opts_help[i]); 2129 (int)(optlen - strlen(long_opts[i].name) - a_arg_len), "");
1429 2130
1430 if (status != EXIT_SUCCESS) 2131 /* finally the help text */
1431 exit(status); 2132 printf("* %s\n", opts_help[i]);
1432 2133 }
1433 puts("\nThe format modifiers for the -F option are:");
1434 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1435 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1436 puts(" i INTERP \tb BIND \ts symbol");
1437 puts(" N library \to Type \tT TEXTRELs");
1438 puts(" S SONAME \tk section");
1439 puts(" p filename (with search path removed)");
1440 puts(" f filename (short name/basename)");
1441 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1442 2134
1443 puts("\nELF Etypes:"); 2135 puts("\nFor more information, see the scanelf(1) manpage");
1444 print_etypes(stdout);
1445
1446 exit(status); 2136 exit(status);
1447} 2137}
1448 2138
1449/* parse command line arguments and preform needed actions */ 2139/* parse command line arguments and preform needed actions */
2140#define do_pax_state(option, flag) \
2141 if (islower(option)) { \
2142 flags &= ~PF_##flag; \
2143 flags |= PF_NO##flag; \
2144 } else { \
2145 flags &= ~PF_NO##flag; \
2146 flags |= PF_##flag; \
2147 }
2148static void parse_delimited(array_t *arr, char *arg, const char *delim)
2149{
2150 char *ele = strtok(arg, delim);
2151 if (!ele) /* edge case: -s '' */
2152 xarraypush_str(arr, "");
2153 while (ele) {
2154 xarraypush_str(arr, ele);
2155 ele = strtok(NULL, delim);
2156 }
2157}
1450static void parseargs(int argc, char *argv[]) 2158static int parseargs(int argc, char *argv[])
1451{ 2159{
1452 int i; 2160 int i;
1453 char *from_file = NULL; 2161 const char *from_file = NULL;
2162 int ret = 0;
2163 char load_cache_config = 0;
1454 2164
1455 opterr = 0; 2165 opterr = 0;
1456 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 2166 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1457 switch (i) { 2167 switch (i) {
1458 2168
1466 case 'f': 2176 case 'f':
1467 if (from_file) warn("You prob don't want to specify -f twice"); 2177 if (from_file) warn("You prob don't want to specify -f twice");
1468 from_file = optarg; 2178 from_file = optarg;
1469 break; 2179 break;
1470 case 'E': 2180 case 'E':
1471 strncpy(match_etypes, optarg, sizeof(match_etypes)); 2181 /* historically, this was comma delimited */
2182 parse_delimited(match_etypes, optarg, ",");
1472 break; 2183 break;
1473 case 'M': 2184 case 'M':
1474 match_bits = atoi(optarg); 2185 match_bits = atoi(optarg);
2186 if (match_bits == 0) {
2187 if (strcmp(optarg, "ELFCLASS32") == 0)
2188 match_bits = 32;
2189 if (strcmp(optarg, "ELFCLASS64") == 0)
2190 match_bits = 64;
2191 }
2192 break;
2193 case 'O':
2194 if (sscanf(optarg, "%o", &match_perms) == -1)
2195 match_bits = 0;
1475 break; 2196 break;
1476 case 'o': { 2197 case 'o': {
1477 FILE *fp = NULL;
1478 if ((fp = freopen(optarg, "w", stdout)) == NULL) 2198 if (freopen(optarg, "w", stdout) == NULL)
1479 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 2199 errp("Could not freopen(%s)", optarg);
1480 SET_STDOUT(fp);
1481 break; 2200 break;
1482 } 2201 }
1483 case 'k': 2202 case 'k':
1484 if (find_section) warn("You prob don't want to specify -k twice"); 2203 xarraypush_str(find_section_arr, optarg);
1485 find_section = optarg;
1486 break; 2204 break;
1487 case 's': { 2205 case 's':
1488 if (find_sym) warn("You prob don't want to specify -s twice"); 2206 /* historically, this was comma delimited */
1489 find_sym = optarg; 2207 parse_delimited(find_sym_arr, optarg, ",");
1490 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1491 sprintf(versioned_symname, "%s@", find_sym);
1492 break; 2208 break;
1493 }
1494 case 'N': { 2209 case 'N':
1495 if (find_lib) warn("You prob don't want to specify -N twice"); 2210 xarraypush_str(find_lib_arr, optarg);
1496 find_lib = optarg;
1497 break; 2211 break;
1498 }
1499
1500 case 'F': { 2212 case 'F': {
1501 if (out_format) warn("You prob don't want to specify -F twice"); 2213 if (out_format) warn("You prob don't want to specify -F twice");
1502 out_format = optarg; 2214 out_format = optarg;
1503 break; 2215 break;
1504 } 2216 }
1505 case 'z': { 2217 case 'z': {
1506 unsigned long flags = 10240; 2218 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1507 size_t x; 2219 size_t x;
1508 2220
1509#define do_state(option, flag) \
1510 if (islower(option)) { \
1511 flags &= ~PF_##flag; \
1512 flags |= PF_NO##flag; \
1513 } else { \
1514 flags &= ~PF_NO##flag; \
1515 flags |= PF_##flag; \
1516 }
1517
1518 for (x = 0 ; x < strlen(optarg); x++) { 2221 for (x = 0; x < strlen(optarg); x++) {
1519 switch(optarg[x]) { 2222 switch (optarg[x]) {
1520 case 'p': 2223 case 'p':
1521 case 'P': 2224 case 'P':
1522 do_state(optarg[x], PAGEEXEC); 2225 do_pax_state(optarg[x], PAGEEXEC);
1523 break; 2226 break;
1524 case 's': 2227 case 's':
1525 case 'S': 2228 case 'S':
1526 do_state(optarg[x], SEGMEXEC); 2229 do_pax_state(optarg[x], SEGMEXEC);
1527 break; 2230 break;
1528 case 'm': 2231 case 'm':
1529 case 'M': 2232 case 'M':
1530 do_state(optarg[x], MPROTECT); 2233 do_pax_state(optarg[x], MPROTECT);
1531 break; 2234 break;
1532 case 'e': 2235 case 'e':
1533 case 'E': 2236 case 'E':
1534 do_state(optarg[x], EMUTRAMP); 2237 do_pax_state(optarg[x], EMUTRAMP);
1535 break; 2238 break;
1536 case 'r': 2239 case 'r':
1537 case 'R': 2240 case 'R':
1538 do_state(optarg[x], RANDMMAP); 2241 do_pax_state(optarg[x], RANDMMAP);
1539 break; 2242 break;
1540 case 'x': 2243 case 'x':
1541 case 'X': 2244 case 'X':
1542 do_state(optarg[x], RANDEXEC); 2245 do_pax_state(optarg[x], RANDEXEC);
1543 break; 2246 break;
1544 default: 2247 default:
1545 break; 2248 break;
1546 } 2249 }
1547 } 2250 }
1552 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) || 2255 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1553 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)))) 2256 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1554 setpax = flags; 2257 setpax = flags;
1555 break; 2258 break;
1556 } 2259 }
2260 case 'Z': show_size = 1; break;
1557 case 'g': gmatch = 1; break; 2261 case 'g': ++g_match; break;
1558 case 'L': use_ldcache = 1; break; 2262 case 'L': load_cache_config = use_ldcache = 1; break;
1559 case 'y': scan_symlink = 0; break; 2263 case 'y': scan_symlink = 0; break;
1560 case 'A': scan_archives = 1; break; 2264 case 'A': scan_archives = 1; break;
2265 case 'C': color_init(true); break;
1561 case 'B': show_banner = 0; break; 2266 case 'B': show_banner = 0; break;
1562 case 'l': scan_ldpath = 1; break; 2267 case 'l': load_cache_config = scan_ldpath = 1; break;
1563 case 'p': scan_envpath = 1; break; 2268 case 'p': scan_envpath = 1; break;
1564 case 'R': dir_recurse = 1; break; 2269 case 'R': dir_recurse = 1; break;
1565 case 'm': dir_crossmount = 0; break; 2270 case 'm': dir_crossmount = 0; break;
1566 case 'X': ++fix_elf; break; 2271 case 'X': ++fix_elf; break;
1567 case 'x': show_pax = 1; break; 2272 case 'x': show_pax = 1; break;
1571 case 'n': show_needed = 1; break; 2276 case 'n': show_needed = 1; break;
1572 case 'i': show_interp = 1; break; 2277 case 'i': show_interp = 1; break;
1573 case 'b': show_bind = 1; break; 2278 case 'b': show_bind = 1; break;
1574 case 'S': show_soname = 1; break; 2279 case 'S': show_soname = 1; break;
1575 case 'T': show_textrels = 1; break; 2280 case 'T': show_textrels = 1; break;
1576 case 'q': be_quiet = 1; break; 2281 case 'q': be_quiet = min(be_quiet, 20) + 1; break;
1577 case 'v': be_verbose = (be_verbose % 20) + 1; break; 2282 case 'v': be_verbose = min(be_verbose, 20) + 1; break;
1578 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break; 2283 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
1579 2284 case 'D': show_endian = 1; break;
2285 case 'I': show_osabi = 1; break;
2286 case 'Y': show_eabi = 1; break;
2287 case 128:
2288 root_fd = open(optarg, O_RDONLY|O_CLOEXEC);
2289 if (root_fd == -1)
2290 err("Could not open root: %s", optarg);
2291 break;
2292 case 129: load_cache_config = use_ldpath = 1; break;
1580 case ':': 2293 case ':':
1581 err("Option '%c' is missing parameter", optopt); 2294 err("Option '%c' is missing parameter", optopt);
1582 case '?': 2295 case '?':
1583 err("Unknown option '%c' or argument missing", optopt); 2296 err("Unknown option '%c' or argument missing", optopt);
1584 default: 2297 default:
1585 err("Unhandled option '%c'; please report this", i); 2298 err("Unhandled option '%c'; please report this", i);
1586 } 2299 }
1587 } 2300 }
2301 if (show_textrels && be_verbose)
2302 objdump = which("objdump", "OBJDUMP");
2303 /* precompile all the regexes */
2304 if (g_match) {
2305 regex_t preg;
2306 const char *this_sym;
2307 size_t n;
2308 int flags = REG_EXTENDED | REG_NOSUB | (g_match > 1 ? REG_ICASE : 0);
1588 2309
2310 array_for_each(find_sym_arr, n, this_sym) {
2311 /* see scanelf_match_symname for logic info */
2312 switch (this_sym[0]) {
2313 case '%':
2314 while (*(this_sym++))
2315 if (*this_sym == '%') {
2316 ++this_sym;
2317 break;
2318 }
2319 break;
2320 case '+':
2321 case '-':
2322 ++this_sym;
2323 break;
2324 }
2325 if (*this_sym == '*')
2326 ++this_sym;
2327
2328 ret = regcomp(&preg, this_sym, flags);
2329 if (ret) {
2330 char err[256];
2331 regerror(ret, &preg, err, sizeof(err));
2332 err("regcomp of %s failed: %s", this_sym, err);
2333 }
2334 xarraypush(find_sym_regex_arr, &preg, sizeof(preg));
2335 }
2336 }
2337 /* flatten arrays for display */
2338 find_sym = array_flatten_str(find_sym_arr);
2339 find_lib = array_flatten_str(find_lib_arr);
2340 find_section = array_flatten_str(find_section_arr);
1589 /* let the format option override all other options */ 2341 /* let the format option override all other options */
1590 if (out_format) { 2342 if (out_format) {
1591 show_pax = show_phdr = show_textrel = show_rpath = \ 2343 show_pax = show_phdr = show_textrel = show_rpath = \
1592 show_needed = show_interp = show_bind = show_soname = \ 2344 show_needed = show_interp = show_bind = show_soname = \
1593 show_textrels = 0; 2345 show_textrels = show_perms = show_endian = show_size = \
2346 show_osabi = show_eabi = 0;
1594 for (i = 0; out_format[i]; ++i) { 2347 for (i = 0; out_format[i]; ++i) {
1595 if (!IS_MODIFIER(out_format[i])) continue; 2348 if (!IS_MODIFIER(out_format[i])) continue;
1596 2349
1597 switch (out_format[++i]) { 2350 switch (out_format[++i]) {
2351 case '+': break;
1598 case '%': break; 2352 case '%': break;
1599 case '#': break; 2353 case '#': break;
1600 case 'F': break; 2354 case 'F': break;
1601 case 'p': break; 2355 case 'p': break;
1602 case 'f': break; 2356 case 'f': break;
1603 case 'k': break; 2357 case 'k': break;
1604 case 's': break; 2358 case 's': break;
1605 case 'N': break; 2359 case 'N': break;
1606 case 'o': break; 2360 case 'o': break;
2361 case 'a': break;
2362 case 'M': break;
2363 case 'Z': show_size = 1; break;
2364 case 'D': show_endian = 1; break;
2365 case 'I': show_osabi = 1; break;
2366 case 'Y': show_eabi = 1; break;
2367 case 'O': show_perms = 1; break;
1607 case 'x': show_pax = 1; break; 2368 case 'x': show_pax = 1; break;
1608 case 'e': show_phdr = 1; break; 2369 case 'e': show_phdr = 1; break;
1609 case 't': show_textrel = 1; break; 2370 case 't': show_textrel = 1; break;
1610 case 'r': show_rpath = 1; break; 2371 case 'r': show_rpath = 1; break;
1611 case 'n': show_needed = 1; break; 2372 case 'n': show_needed = 1; break;
1612 case 'i': show_interp = 1; break; 2373 case 'i': show_interp = 1; break;
1613 case 'b': show_bind = 1; break; 2374 case 'b': show_bind = 1; break;
1614 case 'S': show_soname = 1; break; 2375 case 'S': show_soname = 1; break;
1615 case 'T': show_textrels = 1; break; 2376 case 'T': show_textrels = 1; break;
1616 default: 2377 default:
1617 err("Invalid format specifier '%c' (byte %i)", 2378 err("invalid format specifier '%c' (byte %i)",
1618 out_format[i], i+1); 2379 out_format[i], i+1);
1619 } 2380 }
1620 } 2381 }
1621 2382
1622 /* construct our default format */ 2383 /* construct our default format */
1623 } else { 2384 } else {
1624 size_t fmt_len = 30; 2385 size_t fmt_len = 30;
1625 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 2386 out_format = xmalloc(sizeof(char) * fmt_len);
2387 *out_format = '\0';
1626 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 2388 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1627 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len); 2389 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
2390 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
2391 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
2392 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
2393 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
2394 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
1628 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len); 2395 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1629 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 2396 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1630 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 2397 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1631 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 2398 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1632 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 2399 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1639 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 2406 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1640 } 2407 }
1641 if (be_verbose > 2) printf("Format: %s\n", out_format); 2408 if (be_verbose > 2) printf("Format: %s\n", out_format);
1642 2409
1643 /* now lets actually do the scanning */ 2410 /* now lets actually do the scanning */
1644 if (scan_ldpath || use_ldcache) 2411 if (load_cache_config)
1645 load_ld_so_conf(0, "/etc/ld.so.conf"); 2412 load_ld_cache_config(__PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
1646 if (scan_ldpath) scanelf_ldpath(); 2413 if (scan_ldpath) scanelf_ldpath();
1647 if (scan_envpath) scanelf_envpath(); 2414 if (scan_envpath) scanelf_envpath();
2415 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
2416 from_file = "-";
1648 if (from_file) { 2417 if (from_file) {
1649 scanelf_from_file(from_file); 2418 scanelf_from_file(from_file);
1650 from_file = *argv; 2419 from_file = *argv;
1651 } 2420 }
1652 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file) 2421 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1653 err("Nothing to scan !?"); 2422 err("Nothing to scan !?");
1654 while (optind < argc) { 2423 while (optind < argc) {
1655 search_path = argv[optind++]; 2424 search_path = argv[optind++];
1656 scanelf_dir(search_path); 2425 ret = scanelf_dir(search_path);
1657 } 2426 }
1658 2427
2428#ifdef __PAX_UTILS_CLEANUP
1659 /* clean up */ 2429 /* clean up */
1660 if (versioned_symname) free(versioned_symname);
1661 for (i = 0; ldpaths[i]; ++i)
1662 free(ldpaths[i]); 2430 xarrayfree(ldpaths);
2431 xarrayfree(find_sym_arr);
2432 xarrayfree(find_lib_arr);
2433 xarrayfree(find_section_arr);
2434 free(find_sym);
2435 free(find_lib);
2436 free(find_section);
2437 {
2438 size_t n;
2439 regex_t *preg;
2440 array_for_each(find_sym_regex_arr, n, preg)
2441 regfree(preg);
2442 xarrayfree(find_sym_regex_arr);
2443 }
1663 2444
1664 if (ldcache != 0) 2445 if (ldcache != 0)
1665 munmap(ldcache, ldcache_size); 2446 munmap(ldcache, ldcache_size);
1666} 2447#endif
1667 2448
1668
1669
1670/* utility funcs */
1671static char *xstrdup(const char *s)
1672{
1673 char *ret = strdup(s);
1674 if (!ret) err("Could not strdup(): %s", strerror(errno));
1675 return ret; 2449 return ret;
1676} 2450}
1677static void *xmalloc(size_t size)
1678{
1679 void *ret = malloc(size);
1680 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1681 return ret;
1682}
1683static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
1684{
1685 size_t new_len;
1686 2451
1687 new_len = strlen(*dst) + strlen(src); 2452static char **get_split_env(const char *envvar)
1688 if (*curr_len <= new_len) {
1689 *curr_len = new_len + (*curr_len / 2);
1690 *dst = realloc(*dst, *curr_len);
1691 if (!*dst)
1692 err("could not realloc() %li bytes", (unsigned long)*curr_len);
1693 }
1694
1695 if (n)
1696 strncat(*dst, src, n);
1697 else
1698 strcat(*dst, src);
1699}
1700static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1701{ 2453{
1702 static char my_app[2]; 2454 const char *delims = " \t\n";
1703 my_app[0] = append; 2455 char **envvals = NULL;
1704 my_app[1] = '\0'; 2456 char *env, *s;
1705 xstrcat(dst, my_app, curr_len); 2457 int nentry;
1706}
1707 2458
2459 if ((env = getenv(envvar)) == NULL)
2460 return NULL;
1708 2461
2462 env = xstrdup(env);
2463 if (env == NULL)
2464 return NULL;
2465
2466 s = strtok(env, delims);
2467 if (s == NULL) {
2468 free(env);
2469 return NULL;
2470 }
2471
2472 nentry = 0;
2473 while (s != NULL) {
2474 ++nentry;
2475 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
2476 envvals[nentry-1] = s;
2477 s = strtok(NULL, delims);
2478 }
2479 envvals[nentry] = NULL;
2480
2481 /* don't want to free(env) as it contains the memory that backs
2482 * the envvals array of strings */
2483 return envvals;
2484}
2485
2486static void parseenv(void)
2487{
2488 color_init(false);
2489 qa_textrels = get_split_env("QA_TEXTRELS");
2490 qa_execstack = get_split_env("QA_EXECSTACK");
2491 qa_wx_load = get_split_env("QA_WX_LOAD");
2492}
2493
2494#ifdef __PAX_UTILS_CLEANUP
2495static void cleanup(void)
2496{
2497 free(out_format);
2498 free(qa_textrels);
2499 free(qa_execstack);
2500 free(qa_wx_load);
2501}
2502#endif
1709 2503
1710int main(int argc, char *argv[]) 2504int main(int argc, char *argv[])
1711{ 2505{
2506 int ret;
1712 if (argc < 2) 2507 if (argc < 2)
1713 usage(EXIT_FAILURE); 2508 usage(EXIT_FAILURE);
2509 parseenv();
1714 parseargs(argc, argv); 2510 ret = parseargs(argc, argv);
1715 fclose(stdout); 2511 fclose(stdout);
1716#ifdef __BOUNDS_CHECKING_ON 2512#ifdef __PAX_UTILS_CLEANUP
1717 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()"); 2513 cleanup();
2514 warn("The calls to add/delete heap should be off:\n"
2515 "\t- 1 due to the out_buffer not being freed in scanelf_fileat()\n"
2516 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
1718#endif 2517#endif
1719 return EXIT_SUCCESS; 2518 return ret;
1720} 2519}
2520
2521/* Match filename against entries in matchlist, return TRUE
2522 * if the file is listed */
2523static int file_matches_list(const char *filename, char **matchlist)
2524{
2525 char **file;
2526 char *match;
2527 char buf[__PAX_UTILS_PATH_MAX];
2528
2529 if (matchlist == NULL)
2530 return 0;
2531
2532 for (file = matchlist; *file != NULL; file++) {
2533 if (search_path) {
2534 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2535 match = buf;
2536 } else {
2537 match = *file;
2538 }
2539 if (fnmatch(match, filename, 0) == 0)
2540 return 1;
2541 }
2542 return 0;
2543}

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