/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.119 Revision 1.243
1/* 1/*
2 * Copyright 2003-2006 Gentoo Foundation 2 * Copyright 2003-2007 Gentoo Foundation
3 * Distributed under the terms of the GNU General Public License v2 3 * Distributed under the terms of the GNU General Public License v2
4 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.119 2006/02/05 02:25:58 solar Exp $ 4 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.243 2012/04/29 05:41:14 vapier Exp $
5 * 5 *
6 * Copyright 2003-2006 Ned Ludd - <solar@gentoo.org> 6 * Copyright 2003-2007 Ned Ludd - <solar@gentoo.org>
7 * Copyright 2004-2006 Mike Frysinger - <vapier@gentoo.org> 7 * Copyright 2004-2007 Mike Frysinger - <vapier@gentoo.org>
8 */ 8 */
9 9
10static const char rcsid[] = "$Id: scanelf.c,v 1.243 2012/04/29 05:41:14 vapier Exp $";
11const char argv0[] = "scanelf";
12
10#include "paxinc.h" 13#include "paxinc.h"
11 14
12static const char *rcsid = "$Id: scanelf.c,v 1.119 2006/02/05 02:25:58 solar Exp $";
13#define argv0 "scanelf"
14
15#define IS_MODIFIER(c) (c == '%' || c == '#') 15#define IS_MODIFIER(c) (c == '%' || c == '#' || c == '+')
16
17
18 16
19/* prototypes */ 17/* prototypes */
20static int scanelf_elfobj(elfobj *elf); 18static int file_matches_list(const char *filename, char **matchlist);
21static int scanelf_elf(const char *filename, int fd, size_t len);
22static int scanelf_archive(const char *filename, int fd, size_t len);
23static void scanelf_file(const char *filename);
24static void scanelf_dir(const char *path);
25static void scanelf_ldpath(void);
26static void scanelf_envpath(void);
27static void usage(int status);
28static void parseargs(int argc, char *argv[]);
29static char *xstrdup(const char *s);
30static void *xmalloc(size_t size);
31static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n);
32#define xstrcat(dst,src,curr_len) xstrncat(dst,src,curr_len,0)
33static inline void xchrcat(char **dst, const char append, size_t *curr_len);
34 19
35/* variables to control behavior */ 20/* variables to control behavior */
36static char match_etypes[126] = ""; 21static char *match_etypes = NULL;
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;
58static char *find_lib = NULL; 49static char *find_lib = NULL;
50static array_t _find_lib_arr = array_init_decl, *find_lib_arr = &_find_lib_arr;
51static char *find_section = NULL;
52static array_t _find_section_arr = array_init_decl, *find_section_arr = &_find_section_arr;
59static char *out_format = NULL; 53static char *out_format = NULL;
60static char *search_path = NULL; 54static char *search_path = NULL;
61static char fix_elf = 0; 55static char fix_elf = 0;
62static char gmatch = 0; 56static char g_match = 0;
63static char use_ldcache = 0; 57static char use_ldcache = 0;
58static char use_ldpath = 0;
64 59
60static char **qa_textrels = NULL;
61static char **qa_execstack = NULL;
62static char **qa_wx_load = NULL;
63static int root_fd = AT_FDCWD;
65 64
66caddr_t ldcache = 0; 65static int match_bits = 0;
66static unsigned int match_perms = 0;
67static void *ldcache = NULL;
67size_t ldcache_size = 0; 68static size_t ldcache_size = 0;
69static unsigned long setpax = 0UL;
68 70
71static int has_objdump = 0;
72
73/* find the path to a file by name */
74static int bin_in_path(const char *fname)
75{
76 char fullpath[__PAX_UTILS_PATH_MAX];
77 char *path, *p;
78
79 path = getenv("PATH");
80 if (!path)
81 return 0;
82
83 while ((p = strrchr(path, ':')) != NULL) {
84 snprintf(fullpath, sizeof(fullpath), "%s/%s", p + 1, fname);
85 *p = 0;
86 if (access(fullpath, R_OK) != -1)
87 return 1;
88 }
89
90 return 0;
91}
92
93static FILE *fopenat_r(int dir_fd, const char *path)
94{
95 int fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
96 if (fd == -1)
97 return NULL;
98 return fdopen(fd, "re");
99}
100
101static const char *root_rel_path(const char *path)
102{
103 /*
104 * openat() will ignore the dirfd if path starts with
105 * a /, so consume all of that noise
106 *
107 * XXX: we don't handle relative paths like ../ that
108 * break out of the --root option, but for now, just
109 * don't do that :P.
110 */
111 if (root_fd != AT_FDCWD) {
112 while (*path == '/')
113 ++path;
114 if (*path == '\0')
115 path = ".";
116 }
117
118 return path;
119}
120
121/* 1 on failure. 0 otherwise */
122static int rematch(const char *regex, const char *match, int cflags)
123{
124 regex_t preg;
125 int ret;
126
127 if ((match == NULL) || (regex == NULL))
128 return EXIT_FAILURE;
129
130 if ((ret = regcomp(&preg, regex, cflags))) {
131 char err[256];
132
133 if (regerror(ret, &preg, err, sizeof(err)))
134 fprintf(stderr, "regcomp failed: %s", err);
135 else
136 fprintf(stderr, "regcomp failed");
137
138 return EXIT_FAILURE;
139 }
140 ret = regexec(&preg, match, 0, NULL, 0);
141 regfree(&preg);
142
143 return ret;
144}
145
69/* sub-funcs for scanelf_file() */ 146/* sub-funcs for scanelf_fileat() */
70static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab) 147static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **str)
71{ 148{
72 /* find the best SHT_DYNSYM and SHT_STRTAB sections */ 149 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
150
151 /* debug sections */
152 void *symtab = elf_findsecbyname(elf, ".symtab");
153 void *strtab = elf_findsecbyname(elf, ".strtab");
154 /* runtime sections */
155 void *dynsym = elf_findsecbyname(elf, ".dynsym");
156 void *dynstr = elf_findsecbyname(elf, ".dynstr");
157
73#define GET_SYMTABS(B) \ 158#define GET_SYMTABS(B) \
74 if (elf->elf_class == ELFCLASS ## B) { \ 159 if (elf->elf_class == ELFCLASS ## B) { \
75 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
76 /* debug sections */ \
77 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
78 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
79 /* runtime sections */ \
80 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
81 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
82 if (symtab && dynsym) { \ 160 if (symtab && dynsym) { \
161 Elf ## B ## _Shdr *esymtab = symtab; \
162 Elf ## B ## _Shdr *edynsym = dynsym; \
83 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \ 163 *sym = (EGET(esymtab->sh_size) > EGET(edynsym->sh_size)) ? symtab : dynsym; \
84 } else { \ 164 } else \
85 *sym = (void*)(symtab ? symtab : dynsym); \ 165 *sym = symtab ? symtab : dynsym; \
86 } \
87 if (strtab && dynstr) { \ 166 if (strtab && dynstr) { \
167 Elf ## B ## _Shdr *estrtab = strtab; \
168 Elf ## B ## _Shdr *edynstr = dynstr; \
88 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \ 169 *str = (EGET(estrtab->sh_size) > EGET(edynstr->sh_size)) ? strtab : dynstr; \
89 } else { \ 170 } else \
90 *tab = (void*)(strtab ? strtab : dynstr); \ 171 *str = strtab ? strtab : dynstr; \
91 } \
92 } 172 }
93 GET_SYMTABS(32) 173 GET_SYMTABS(32)
94 GET_SYMTABS(64) 174 GET_SYMTABS(64)
175
176 if (*sym && *str)
177 return;
178
179 /*
180 * damn, they're really going to make us work for it huh?
181 * reconstruct the section header info out of the dynamic
182 * tags so we can see what symbols this guy uses at runtime.
183 */
184#define GET_SYMTABS_DT(B) \
185 if (elf->elf_class == ELFCLASS ## B) { \
186 size_t i; \
187 static Elf ## B ## _Shdr sym_shdr, str_shdr; \
188 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
189 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
190 Elf ## B ## _Addr vsym, vstr, vhash, vgnu_hash; \
191 Elf ## B ## _Dyn *dyn; \
192 Elf ## B ## _Off offset; \
193 \
194 /* lookup symbols used at runtime with DT_SYMTAB / DT_STRTAB */ \
195 vsym = vstr = vhash = vgnu_hash = 0; \
196 memset(&sym_shdr, 0, sizeof(sym_shdr)); \
197 memset(&str_shdr, 0, sizeof(str_shdr)); \
198 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
199 if (EGET(phdr[i].p_type) != PT_DYNAMIC) \
200 continue; \
201 \
202 offset = EGET(phdr[i].p_offset); \
203 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
204 continue; \
205 \
206 dyn = DYN ## B (elf->vdata + offset); \
207 while (EGET(dyn->d_tag) != DT_NULL) { \
208 switch (EGET(dyn->d_tag)) { \
209 case DT_SYMTAB: vsym = EGET(dyn->d_un.d_val); break; \
210 case DT_SYMENT: sym_shdr.sh_entsize = dyn->d_un.d_val; break; \
211 case DT_STRTAB: vstr = EGET(dyn->d_un.d_val); break; \
212 case DT_STRSZ: str_shdr.sh_size = dyn->d_un.d_val; break; \
213 case DT_HASH: vhash = EGET(dyn->d_un.d_val); break; \
214 /*case DT_GNU_HASH: vgnu_hash = EGET(dyn->d_un.d_val); break;*/ \
215 } \
216 ++dyn; \
217 } \
218 if (vsym && vstr) \
219 break; \
220 } \
221 if (!vsym || !vstr || !(vhash || vgnu_hash)) \
222 return; \
223 \
224 /* calc offset into the ELF by finding the load addr of the syms */ \
225 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
226 Elf ## B ## _Addr vaddr = EGET(phdr[i].p_vaddr); \
227 Elf ## B ## _Addr filesz = EGET(phdr[i].p_filesz); \
228 offset = EGET(phdr[i].p_offset); \
229 \
230 if (EGET(phdr[i].p_type) != PT_LOAD) \
231 continue; \
232 \
233 if (vhash >= vaddr && vhash < vaddr + filesz) { \
234 /* Scan the hash table to see how many entries we have */ \
235 Elf32_Word max_sym_idx = 0; \
236 Elf32_Word *hashtbl = elf->vdata + offset + (vhash - vaddr); \
237 Elf32_Word b, nbuckets = EGET(hashtbl[0]); \
238 Elf32_Word nchains = EGET(hashtbl[1]); \
239 Elf32_Word *buckets = &hashtbl[2]; \
240 Elf32_Word *chains = &buckets[nbuckets]; \
241 Elf32_Word sym_idx; \
242 \
243 for (b = 0; b < nbuckets; ++b) { \
244 if (!buckets[b]) \
245 continue; \
246 for (sym_idx = buckets[b]; sym_idx < nchains && sym_idx; sym_idx = chains[sym_idx]) \
247 if (max_sym_idx < sym_idx) \
248 max_sym_idx = sym_idx; \
249 } \
250 ESET(sym_shdr.sh_size, sym_shdr.sh_entsize * max_sym_idx); \
251 } \
252 \
253 if (vsym >= vaddr && vsym < vaddr + filesz) { \
254 ESET(sym_shdr.sh_offset, offset + (vsym - vaddr)); \
255 *sym = &sym_shdr; \
256 } \
257 \
258 if (vstr >= vaddr && vstr < vaddr + filesz) { \
259 ESET(str_shdr.sh_offset, offset + (vstr - vaddr)); \
260 *str = &str_shdr; \
261 } \
262 } \
263 }
264 GET_SYMTABS_DT(32)
265 GET_SYMTABS_DT(64)
95} 266}
267
96static char *scanelf_file_pax(elfobj *elf, char *found_pax) 268static char *scanelf_file_pax(elfobj *elf, char *found_pax)
97{ 269{
98 static char ret[7]; 270 static char ret[7];
99 unsigned long i, shown; 271 unsigned long i, shown;
100 272
109 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 281 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
110 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 282 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
111 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 283 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
112 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \ 284 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
113 continue; \ 285 continue; \
114 if (be_quiet && (EGET(phdr[i].p_flags) == 10240)) \ 286 if (fix_elf && setpax) { \
287 /* set the paxctl flags */ \
288 ESET(phdr[i].p_flags, setpax); \
289 } \
290 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
115 continue; \ 291 continue; \
116 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \ 292 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
117 *found_pax = 1; \ 293 *found_pax = 1; \
118 ++shown; \ 294 ++shown; \
119 break; \ 295 break; \
120 } \ 296 } \
121 } 297 }
122 SHOW_PAX(32) 298 SHOW_PAX(32)
123 SHOW_PAX(64) 299 SHOW_PAX(64)
124 } 300 }
301
302 /* Note: We do not support setting EI_PAX if not PT_PAX_FLAGS
303 * was found. This is known to break ELFs on glibc systems,
304 * and mainline PaX has deprecated use of this for a long time.
305 * We could support changing PT_GNU_STACK, but that doesn't
306 * seem like it's worth the effort. #411919
307 */
125 308
126 /* fall back to EI_PAX if no PT_PAX was found */ 309 /* fall back to EI_PAX if no PT_PAX was found */
127 if (!*ret) { 310 if (!*ret) {
128 static char *paxflags; 311 static char *paxflags;
129 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf)); 312 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
163 uint32_t flags, check_flags; \ 346 uint32_t flags, check_flags; \
164 if (elf->phdr != NULL) { \ 347 if (elf->phdr != NULL) { \
165 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 348 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
166 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \ 349 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
167 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \ 350 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
351 if (multi_stack++) \
168 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \ 352 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
353 if (file_matches_list(elf->filename, qa_execstack)) \
354 continue; \
169 found = found_phdr; \ 355 found = found_phdr; \
170 offset = 0; \ 356 offset = 0; \
171 check_flags = PF_X; \ 357 check_flags = PF_X; \
172 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \ 358 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
359 if (multi_relro++) \
173 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \ 360 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
174 found = found_relro; \ 361 found = found_relro; \
175 offset = 4; \ 362 offset = 4; \
176 check_flags = PF_X; \ 363 check_flags = PF_X; \
177 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \ 364 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
178 if (ehdr->e_type == ET_DYN || ehdr->e_type == ET_EXEC) \ 365 if (EGET(ehdr->e_type) == ET_DYN || EGET(ehdr->e_type) == ET_EXEC) \
366 if (multi_load++ > max_pt_load) \
179 if (multi_load++ > max_pt_load) warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \ 367 warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
368 if (file_matches_list(elf->filename, qa_wx_load)) \
369 continue; \
180 found = found_load; \ 370 found = found_load; \
181 offset = 8; \ 371 offset = 8; \
182 check_flags = PF_W|PF_X; \ 372 check_flags = PF_W|PF_X; \
183 } else \ 373 } else \
184 continue; \ 374 continue; \
185 flags = EGET(phdr[i].p_flags); \ 375 flags = EGET(phdr[i].p_flags); \
186 if (be_quiet && ((flags & check_flags) != check_flags)) \ 376 if (be_quiet && ((flags & check_flags) != check_flags)) \
187 continue; \ 377 continue; \
188 if (fix_elf && ((flags & PF_X) != flags)) { \ 378 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
189 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \ 379 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
190 ret[3] = ret[7] = '!'; \ 380 ret[3] = ret[7] = '!'; \
191 flags = EGET(phdr[i].p_flags); \ 381 flags = EGET(phdr[i].p_flags); \
192 } \ 382 } \
193 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \ 383 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
197 } else if (elf->shdr != NULL) { \ 387 } else if (elf->shdr != NULL) { \
198 /* no program headers which means this is prob an object file */ \ 388 /* no program headers which means this is prob an object file */ \
199 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \ 389 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
200 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \ 390 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
201 char *str; \ 391 char *str; \
202 if ((void*)strtbl > (void*)elf->data_end) \ 392 if ((void*)strtbl > elf->data_end) \
203 goto skip_this_shdr##B; \ 393 goto skip_this_shdr##B; \
204 check_flags = SHF_WRITE|SHF_EXECINSTR; \ 394 check_flags = SHF_WRITE|SHF_EXECINSTR; \
205 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \ 395 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
206 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \ 396 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
207 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \ 397 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
221 break; \ 411 break; \
222 } \ 412 } \
223 } \ 413 } \
224 skip_this_shdr##B: \ 414 skip_this_shdr##B: \
225 if (!multi_stack) { \ 415 if (!multi_stack) { \
416 if (file_matches_list(elf->filename, qa_execstack)) \
417 return NULL; \
226 *found_phdr = 1; \ 418 *found_phdr = 1; \
227 shown = 1; \ 419 shown = 1; \
228 memcpy(ret, "!WX", 3); \ 420 memcpy(ret, "!WX", 3); \
229 } \ 421 } \
230 } \ 422 } \
235 if (be_wewy_wewy_quiet || (be_quiet && !shown)) 427 if (be_wewy_wewy_quiet || (be_quiet && !shown))
236 return NULL; 428 return NULL;
237 else 429 else
238 return ret; 430 return ret;
239} 431}
432
433/*
434 * See if this ELF contains a DT_TEXTREL tag in any of its
435 * PT_DYNAMIC sections.
436 */
240static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 437static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
241{ 438{
242 static const char *ret = "TEXTREL"; 439 static const char *ret = "TEXTREL";
243 unsigned long i; 440 unsigned long i;
244 441
245 if (!show_textrel && !show_textrels) return NULL; 442 if (!show_textrel && !show_textrels) return NULL;
443
444 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
246 445
247 if (elf->phdr) { 446 if (elf->phdr) {
248#define SHOW_TEXTREL(B) \ 447#define SHOW_TEXTREL(B) \
249 if (elf->elf_class == ELFCLASS ## B) { \ 448 if (elf->elf_class == ELFCLASS ## B) { \
250 Elf ## B ## _Dyn *dyn; \ 449 Elf ## B ## _Dyn *dyn; \
251 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 450 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
252 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 451 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
253 Elf ## B ## _Off offset; \ 452 Elf ## B ## _Off offset; \
254 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 453 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
255 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 454 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
256 offset = EGET(phdr[i].p_offset); \ 455 offset = EGET(phdr[i].p_offset); \
257 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 456 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
258 dyn = DYN ## B (elf->data + offset); \ 457 dyn = DYN ## B (elf->vdata + offset); \
259 while (EGET(dyn->d_tag) != DT_NULL) { \ 458 while (EGET(dyn->d_tag) != DT_NULL) { \
260 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \ 459 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
261 *found_textrel = 1; \ 460 *found_textrel = 1; \
262 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \ 461 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
263 return (be_wewy_wewy_quiet ? NULL : ret); \ 462 return (be_wewy_wewy_quiet ? NULL : ret); \
272 if (be_quiet || be_wewy_wewy_quiet) 471 if (be_quiet || be_wewy_wewy_quiet)
273 return NULL; 472 return NULL;
274 else 473 else
275 return " - "; 474 return " - ";
276} 475}
476
477/*
478 * Scan the .text section to see if there are any relocations in it.
479 * Should rewrite this to check PT_LOAD sections that are marked
480 * Executable rather than the section named '.text'.
481 */
277static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel) 482static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
278{ 483{
279 unsigned long s, r, rmax; 484 unsigned long s, r, rmax;
280 void *symtab_void, *strtab_void, *text_void; 485 void *symtab_void, *strtab_void, *text_void;
281 486
302 Elf ## B ## _Rela *rela; \ 507 Elf ## B ## _Rela *rela; \
303 /* search the section headers for relocations */ \ 508 /* search the section headers for relocations */ \
304 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \ 509 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
305 uint32_t sh_type = EGET(shdr[s].sh_type); \ 510 uint32_t sh_type = EGET(shdr[s].sh_type); \
306 if (sh_type == SHT_REL) { \ 511 if (sh_type == SHT_REL) { \
307 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \ 512 rel = REL ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
308 rela = NULL; \ 513 rela = NULL; \
309 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \ 514 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
310 } else if (sh_type == SHT_RELA) { \ 515 } else if (sh_type == SHT_RELA) { \
311 rel = NULL; \ 516 rel = NULL; \
312 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \ 517 rela = RELA ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
313 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \ 518 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
314 } else \ 519 } else \
315 continue; \ 520 continue; \
316 /* now see if any of the relocs are in the .text */ \ 521 /* now see if any of the relocs are in the .text */ \
317 for (r = 0; r < rmax; ++r) { \ 522 for (r = 0; r < rmax; ++r) { \
332 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \ 537 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
333 if (be_verbose <= 2) continue; \ 538 if (be_verbose <= 2) continue; \
334 } else \ 539 } else \
335 *found_textrels = 1; \ 540 *found_textrels = 1; \
336 /* locate this relocation symbol name */ \ 541 /* locate this relocation symbol name */ \
337 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 542 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
338 if ((void*)sym > (void*)elf->data_end) { \ 543 if ((void*)sym > elf->data_end) { \
339 warn("%s: corrupt ELF symbol", elf->filename); \ 544 warn("%s: corrupt ELF symbol", elf->filename); \
340 continue; \ 545 continue; \
341 } \ 546 } \
342 sym_max = ELF ## B ## _R_SYM(r_info); \ 547 sym_max = ELF ## B ## _R_SYM(r_info); \
343 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \ 548 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
346 sym = NULL; \ 551 sym = NULL; \
347 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 552 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
348 /* show the raw details about this reloc */ \ 553 /* show the raw details about this reloc */ \
349 printf(" %s: ", elf->base_filename); \ 554 printf(" %s: ", elf->base_filename); \
350 if (sym && sym->st_name) \ 555 if (sym && sym->st_name) \
351 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \ 556 printf("%s", elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
352 else \ 557 else \
353 printf("(memory/fake?)"); \ 558 printf("(memory/data?)"); \
354 printf(" [0x%lX]", (unsigned long)r_offset); \ 559 printf(" [0x%lX]", (unsigned long)r_offset); \
355 /* now try to find the closest symbol that this rel is probably in */ \ 560 /* now try to find the closest symbol that this rel is probably in */ \
356 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 561 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
357 func = NULL; \ 562 func = NULL; \
358 offset_tmp = 0; \ 563 offset_tmp = 0; \
359 while (sym_max--) { \ 564 while (sym_max--) { \
360 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \ 565 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
361 func = sym; \ 566 func = sym; \
362 offset_tmp = EGET(sym->st_value); \ 567 offset_tmp = EGET(sym->st_value); \
363 } \ 568 } \
364 ++sym; \ 569 ++sym; \
365 } \ 570 } \
366 printf(" in "); \ 571 printf(" in "); \
367 if (func && func->st_name) \ 572 if (func && func->st_name) { \
368 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \ 573 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
574 if (r_offset > EGET(func->st_size)) \
575 printf("(optimized out: previous %s)", func_name); \
369 else \ 576 else \
370 printf("(NULL: fake?)"); \ 577 printf("%s", func_name); \
578 } else \
579 printf("(optimized out)"); \
371 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \ 580 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
581 if (be_verbose && has_objdump) { \
582 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
583 char *sysbuf; \
584 size_t syslen; \
585 const char sysfmt[] = "objdump -r -R -d -w -l --start-address=0x%lX --stop-address=0x%lX %s | grep --color -i -C 3 '.*[[:space:]]%lX:[[:space:]]*R_.*'\n"; \
586 syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
587 sysbuf = xmalloc(syslen); \
588 if (end_addr < r_offset) \
589 /* not uncommon when things are optimized out */ \
590 end_addr = r_offset + 0x100; \
591 snprintf(sysbuf, syslen, sysfmt, \
592 (unsigned long)offset_tmp, \
593 (unsigned long)end_addr, \
594 elf->filename, \
595 (unsigned long)r_offset); \
596 fflush(stdout); \
597 if (system(sysbuf)) /* don't care */; \
598 fflush(stdout); \
599 free(sysbuf); \
600 } \
372 } \ 601 } \
373 } } 602 } }
374 SHOW_TEXTRELS(32) 603 SHOW_TEXTRELS(32)
375 SHOW_TEXTRELS(64) 604 SHOW_TEXTRELS(64)
376 } 605 }
378 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename); 607 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
379 608
380 return NULL; 609 return NULL;
381} 610}
382 611
383static void rpath_security_checks(elfobj *, char *, const char *);
384static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type) 612static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
385{ 613{
386 struct stat st; 614 struct stat st;
387 switch (*item) { 615 switch (*item) {
388 case '/': break; 616 case '/': break;
394 warnf("Security problem NULL %s in %s", dt_type, elf->filename); 622 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
395 break; 623 break;
396 case '$': 624 case '$':
397 if (fstat(elf->fd, &st) != -1) 625 if (fstat(elf->fd, &st) != -1)
398 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID)) 626 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
399 warnf("Security problem with %s='%s' in %s with mode set of %o", 627 warnf("Security problem with %s='%s' in %s with mode set of %o",
400 dt_type, item, elf->filename, st.st_mode & 07777); 628 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
401 break; 629 break;
402 default: 630 default:
403 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename); 631 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
404 break; 632 break;
405 } 633 }
406} 634}
407static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len) 635static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
408{ 636{
409 unsigned long i, s; 637 unsigned long i;
410 char *rpath, *runpath, **r; 638 char *rpath, *runpath, **r;
411 void *strtbl_void; 639 void *strtbl_void;
412 640
413 if (!show_rpath) return; 641 if (!show_rpath) return;
414 642
425 Elf ## B ## _Off offset; \ 653 Elf ## B ## _Off offset; \
426 Elf ## B ## _Xword word; \ 654 Elf ## B ## _Xword word; \
427 /* Scan all the program headers */ \ 655 /* Scan all the program headers */ \
428 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 656 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
429 /* Just scan dynamic headers */ \ 657 /* Just scan dynamic headers */ \
430 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 658 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
431 offset = EGET(phdr[i].p_offset); \ 659 offset = EGET(phdr[i].p_offset); \
432 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 660 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
433 /* Just scan dynamic RPATH/RUNPATH headers */ \ 661 /* Just scan dynamic RPATH/RUNPATH headers */ \
434 dyn = DYN ## B (elf->data + offset); \ 662 dyn = DYN ## B (elf->vdata + offset); \
435 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \ 663 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
436 if (word == DT_RPATH) { \ 664 if (word == DT_RPATH) { \
437 r = &rpath; \ 665 r = &rpath; \
438 } else if (word == DT_RUNPATH) { \ 666 } else if (word == DT_RUNPATH) { \
439 r = &runpath; \ 667 r = &runpath; \
443 } \ 671 } \
444 /* Verify the memory is somewhat sane */ \ 672 /* Verify the memory is somewhat sane */ \
445 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 673 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
446 if (offset < (Elf ## B ## _Off)elf->len) { \ 674 if (offset < (Elf ## B ## _Off)elf->len) { \
447 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \ 675 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
448 *r = (char*)(elf->data + offset); \ 676 *r = elf->data + offset; \
449 /* cache the length in case we need to nuke this section later on */ \ 677 /* cache the length in case we need to nuke this section later on */ \
450 if (fix_elf) \ 678 if (fix_elf) \
451 offset = strlen(*r); \ 679 offset = strlen(*r); \
452 /* If quiet, don't output paths in ld.so.conf */ \ 680 /* If quiet, don't output paths in ld.so.conf */ \
453 if (be_quiet) { \ 681 if (be_quiet) { \
459 /* scan each path in : delimited list */ \ 687 /* scan each path in : delimited list */ \
460 while (start) { \ 688 while (start) { \
461 rpath_security_checks(elf, start, get_elfdtype(word)); \ 689 rpath_security_checks(elf, start, get_elfdtype(word)); \
462 end = strchr(start, ':'); \ 690 end = strchr(start, ':'); \
463 len = (end ? abs(end - start) : strlen(start)); \ 691 len = (end ? abs(end - start) : strlen(start)); \
464 if (use_ldcache) \ 692 if (use_ldcache) { \
465 for (s = 0; ldpaths[s]; ++s) \ 693 size_t n; \
694 const char *ldpath; \
695 array_for_each(ldpaths, n, ldpath) \
466 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \ 696 if (!strncmp(ldpath, start, len) && !ldpath[len]) { \
467 *r = end; \ 697 *r = end; \
468 /* corner case ... if RPATH reads "/usr/lib:", we want \ 698 /* corner case ... if RPATH reads "/usr/lib:", we want \
469 * to show ':' rather than '' */ \ 699 * to show ':' rather than '' */ \
470 if (end && end[1] != '\0') \ 700 if (end && end[1] != '\0') \
471 (*r)++; \ 701 (*r)++; \
472 break; \ 702 break; \
473 } \ 703 } \
704 } \
474 if (!*r || !end) \ 705 if (!*r || !end) \
475 break; \ 706 break; \
476 else \ 707 else \
477 start = start + len + 1; \ 708 start = start + len + 1; \
478 } \ 709 } \
563#define FLAG_S390_LIB64 0x0400 794#define FLAG_S390_LIB64 0x0400
564#define FLAG_POWERPC_LIB64 0x0500 795#define FLAG_POWERPC_LIB64 0x0500
565#define FLAG_MIPS64_LIBN32 0x0600 796#define FLAG_MIPS64_LIBN32 0x0600
566#define FLAG_MIPS64_LIBN64 0x0700 797#define FLAG_MIPS64_LIBN64 0x0700
567 798
568static char *lookup_cache_lib(elfobj *, char *); 799#if defined(__GLIBC__) || defined(__UCLIBC__)
800
569static char *lookup_cache_lib(elfobj *elf, char *fname) 801static char *lookup_cache_lib(elfobj *elf, const char *fname)
570{ 802{
571 int fd = 0; 803 int fd;
572 char *strs; 804 char *strs;
573 static char buf[__PAX_UTILS_PATH_MAX] = ""; 805 static char buf[__PAX_UTILS_PATH_MAX] = "";
574 const char *cachefile = "/etc/ld.so.cache"; 806 const char *cachefile = root_rel_path("/etc/ld.so.cache");
575 struct stat st; 807 struct stat st;
576 808
577 typedef struct { 809 typedef struct {
578 char magic[LDSO_CACHE_MAGIC_LEN]; 810 char magic[LDSO_CACHE_MAGIC_LEN];
579 char version[LDSO_CACHE_VER_LEN]; 811 char version[LDSO_CACHE_VER_LEN];
589 libentry_t *libent; 821 libentry_t *libent;
590 822
591 if (fname == NULL) 823 if (fname == NULL)
592 return NULL; 824 return NULL;
593 825
594 if (ldcache == 0) { 826 if (ldcache == NULL) {
595 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1) 827 if (fstatat(root_fd, cachefile, &st, 0))
828 return NULL;
829
830 fd = openat(root_fd, cachefile, O_RDONLY);
831 if (fd == -1)
596 return NULL; 832 return NULL;
597 833
598 /* cache these values so we only map/unmap the cache file once */ 834 /* cache these values so we only map/unmap the cache file once */
599 ldcache_size = st.st_size; 835 ldcache_size = st.st_size;
600 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0); 836 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
601
602 close(fd); 837 close(fd);
603 838
604 if (ldcache == (caddr_t)-1) { 839 if (ldcache == MAP_FAILED) {
605 ldcache = 0; 840 ldcache = NULL;
606 return NULL; 841 return NULL;
607 } 842 }
608 843
609 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN)) 844 if (memcmp(header->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN) ||
845 memcmp(header->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
846 {
847 munmap(ldcache, ldcache_size);
848 ldcache = NULL;
610 return NULL; 849 return NULL;
611 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
612 return NULL;
613 } 850 }
851 } else
852 header = ldcache;
614 853
615 header = (header_t *) ldcache;
616 libent = (libentry_t *) (ldcache + sizeof(header_t)); 854 libent = ldcache + sizeof(header_t);
617 strs = (char *) &libent[header->nlibs]; 855 strs = (char *) &libent[header->nlibs];
618 856
619 for (fd = 0; fd < header->nlibs; fd++) { 857 for (fd = 0; fd < header->nlibs; ++fd) {
620 /* this should be more fine grained, but for now we assume that 858 /* This should be more fine grained, but for now we assume that
621 * diff arches will not be cached together. and we ignore the 859 * diff arches will not be cached together, and we ignore the
622 * the different multilib mips cases. */ 860 * the different multilib mips cases.
861 */
623 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK)) 862 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
624 continue; 863 continue;
625 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK)) 864 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
626 continue; 865 continue;
627 866
628 if (strcmp(fname, strs + libent[fd].sooffset) != 0) 867 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
629 continue; 868 continue;
869
870 /* Return first hit because that is how the ldso rolls */
630 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf)); 871 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
872 break;
631 } 873 }
874
632 return buf; 875 return buf;
633} 876}
634 877
878#elif defined(__NetBSD__)
879static char *lookup_cache_lib(elfobj *elf, const char *fname)
880{
881 static char buf[__PAX_UTILS_PATH_MAX] = "";
882 static struct stat st;
883 size_t n;
884 char *ldpath;
885
886 array_for_each(ldpath, n, ldpath) {
887 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", ldpath, fname) >= sizeof(buf))
888 continue; /* if the pathname is too long, or something went wrong, ignore */
889
890 if (stat(buf, &st) != 0)
891 continue; /* if the lib doesn't exist in *ldpath, look further */
892
893 /* NetBSD doesn't actually do sanity checks, it just loads the file
894 * and if that doesn't work, continues looking in other directories.
895 * This cannot easily be safely emulated, unfortunately. For now,
896 * just assume that if it exists, it's a valid library. */
897
898 return buf;
899 }
900
901 /* not found in any path */
902 return NULL;
903}
904#else
905#ifdef __ELF__
906#warning Cache support not implemented for your target
907#endif
908static char *lookup_cache_lib(elfobj *elf, const char *fname)
909{
910 return NULL;
911}
912#endif
913
914static char *lookup_config_lib(elfobj *elf, char *fname)
915{
916 static char buf[__PAX_UTILS_PATH_MAX] = "";
917 const char *ldpath;
918 size_t n;
919
920 array_for_each(ldpaths, n, ldpath) {
921 snprintf(buf, sizeof(buf), "%s/%s", root_rel_path(ldpath), fname);
922 if (faccessat(root_fd, buf, F_OK, AT_SYMLINK_NOFOLLOW) == 0)
923 return buf;
924 }
925
926 return NULL;
927}
635 928
636static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len) 929static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
637{ 930{
638 unsigned long i; 931 unsigned long i;
639 char *needed; 932 char *needed;
640 void *strtbl_void; 933 void *strtbl_void;
641 char *p; 934 char *p;
642 935
936 /*
937 * -n -> op==0 -> print all
938 * -N -> op==1 -> print requested
939 */
643 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL; 940 if ((op == 0 && !show_needed) || (op == 1 && !find_lib))
941 return NULL;
644 942
645 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 943 strtbl_void = elf_findsecbyname(elf, ".dynstr");
646 944
647 if (elf->phdr && strtbl_void) { 945 if (elf->phdr && strtbl_void) {
648#define SHOW_NEEDED(B) \ 946#define SHOW_NEEDED(B) \
650 Elf ## B ## _Dyn *dyn; \ 948 Elf ## B ## _Dyn *dyn; \
651 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 949 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
652 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 950 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
653 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 951 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
654 Elf ## B ## _Off offset; \ 952 Elf ## B ## _Off offset; \
953 size_t matched = 0; \
954 /* Walk all the program headers to find the PT_DYNAMIC */ \
655 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 955 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
656 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 956 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) \
957 continue; \
657 offset = EGET(phdr[i].p_offset); \ 958 offset = EGET(phdr[i].p_offset); \
658 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 959 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
960 continue; \
961 /* Walk all the dynamic tags to find NEEDED entries */ \
659 dyn = DYN ## B (elf->data + offset); \ 962 dyn = DYN ## B (elf->vdata + offset); \
660 while (EGET(dyn->d_tag) != DT_NULL) { \ 963 while (EGET(dyn->d_tag) != DT_NULL) { \
661 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 964 if (EGET(dyn->d_tag) == DT_NEEDED) { \
662 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 965 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
663 if (offset >= (Elf ## B ## _Off)elf->len) { \ 966 if (offset >= (Elf ## B ## _Off)elf->len) { \
664 ++dyn; \ 967 ++dyn; \
665 continue; \ 968 continue; \
666 } \ 969 } \
667 needed = (char*)(elf->data + offset); \ 970 needed = elf->data + offset; \
668 if (op == 0) { \ 971 if (op == 0) { \
972 /* -n -> print all entries */ \
669 if (!be_wewy_wewy_quiet) { \ 973 if (!be_wewy_wewy_quiet) { \
670 if (*found_needed) xchrcat(ret, ',', ret_len); \ 974 if (*found_needed) xchrcat(ret, ',', ret_len); \
671 if (use_ldcache) \ 975 if (use_ldpath) { \
976 if ((p = lookup_config_lib(elf, needed)) != NULL) \
977 needed = p; \
978 } else if (use_ldcache) { \
672 if ((p = lookup_cache_lib(elf, needed)) != NULL) \ 979 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
673 needed = p; \ 980 needed = p; \
981 } \
674 xstrcat(ret, needed, ret_len); \ 982 xstrcat(ret, needed, ret_len); \
675 } \ 983 } \
676 *found_needed = 1; \ 984 *found_needed = 1; \
677 } else { \ 985 } else { \
678 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \ 986 /* -N -> print matching entries */ \
987 size_t n; \
988 const char *find_lib_name; \
989 \
990 array_for_each(find_lib_arr, n, find_lib_name) { \
991 int invert = 1; \
992 if (find_lib_name[0] == '!') \
993 invert = 0, ++find_lib_name; \
994 if (!strcmp(find_lib_name, needed) == invert) \
995 ++matched; \
996 } \
997 \
998 if (matched == array_cnt(find_lib_arr)) { \
679 *found_lib = 1; \ 999 *found_lib = 1; \
680 return (be_wewy_wewy_quiet ? NULL : needed); \ 1000 return (be_wewy_wewy_quiet ? NULL : find_lib); \
681 } \ 1001 } \
682 } \ 1002 } \
683 } \ 1003 } \
684 ++dyn; \ 1004 ++dyn; \
685 } \ 1005 } \
714} 1034}
715static char *scanelf_file_bind(elfobj *elf, char *found_bind) 1035static char *scanelf_file_bind(elfobj *elf, char *found_bind)
716{ 1036{
717 unsigned long i; 1037 unsigned long i;
718 struct stat s; 1038 struct stat s;
1039 char dynamic = 0;
719 1040
720 if (!show_bind) return NULL; 1041 if (!show_bind) return NULL;
721 if (!elf->phdr) return NULL; 1042 if (!elf->phdr) return NULL;
722 1043
723#define SHOW_BIND(B) \ 1044#define SHOW_BIND(B) \
725 Elf ## B ## _Dyn *dyn; \ 1046 Elf ## B ## _Dyn *dyn; \
726 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 1047 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
727 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 1048 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
728 Elf ## B ## _Off offset; \ 1049 Elf ## B ## _Off offset; \
729 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 1050 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
730 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 1051 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1052 dynamic = 1; \
731 offset = EGET(phdr[i].p_offset); \ 1053 offset = EGET(phdr[i].p_offset); \
732 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 1054 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
733 dyn = DYN ## B (elf->data + offset); \ 1055 dyn = DYN ## B (elf->vdata + offset); \
734 while (EGET(dyn->d_tag) != DT_NULL) { \ 1056 while (EGET(dyn->d_tag) != DT_NULL) { \
735 if (EGET(dyn->d_tag) == DT_BIND_NOW || \ 1057 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
736 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \ 1058 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
737 { \ 1059 { \
738 if (be_quiet) return NULL; \ 1060 if (be_quiet) return NULL; \
746 SHOW_BIND(32) 1068 SHOW_BIND(32)
747 SHOW_BIND(64) 1069 SHOW_BIND(64)
748 1070
749 if (be_wewy_wewy_quiet) return NULL; 1071 if (be_wewy_wewy_quiet) return NULL;
750 1072
1073 /* don't output anything if quiet mode and the ELF is static or not setuid */
751 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) { 1074 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
752 return NULL; 1075 return NULL;
753 } else { 1076 } else {
754 *found_bind = 1; 1077 *found_bind = 1;
755 return (char *) "LAZY"; 1078 return (char *)(dynamic ? "LAZY" : "STATIC");
756 } 1079 }
757} 1080}
758static char *scanelf_file_soname(elfobj *elf, char *found_soname) 1081static char *scanelf_file_soname(elfobj *elf, char *found_soname)
759{ 1082{
760 unsigned long i; 1083 unsigned long i;
772 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 1095 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
773 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 1096 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
774 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 1097 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
775 Elf ## B ## _Off offset; \ 1098 Elf ## B ## _Off offset; \
776 /* only look for soname in shared objects */ \ 1099 /* only look for soname in shared objects */ \
777 if (ehdr->e_type != ET_DYN) \ 1100 if (EGET(ehdr->e_type) != ET_DYN) \
778 return NULL; \ 1101 return NULL; \
779 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 1102 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
780 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 1103 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
781 offset = EGET(phdr[i].p_offset); \ 1104 offset = EGET(phdr[i].p_offset); \
782 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 1105 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
783 dyn = DYN ## B (elf->data + offset); \ 1106 dyn = DYN ## B (elf->vdata + offset); \
784 while (EGET(dyn->d_tag) != DT_NULL) { \ 1107 while (EGET(dyn->d_tag) != DT_NULL) { \
785 if (EGET(dyn->d_tag) == DT_SONAME) { \ 1108 if (EGET(dyn->d_tag) == DT_SONAME) { \
786 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 1109 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
787 if (offset >= (Elf ## B ## _Off)elf->len) { \ 1110 if (offset >= (Elf ## B ## _Off)elf->len) { \
788 ++dyn; \ 1111 ++dyn; \
789 continue; \ 1112 continue; \
790 } \ 1113 } \
791 soname = (char*)(elf->data + offset); \ 1114 soname = elf->data + offset; \
792 *found_soname = 1; \ 1115 *found_soname = 1; \
793 return (be_wewy_wewy_quiet ? NULL : soname); \ 1116 return (be_wewy_wewy_quiet ? NULL : soname); \
794 } \ 1117 } \
795 ++dyn; \ 1118 ++dyn; \
796 } \ 1119 } \
799 SHOW_SONAME(64) 1122 SHOW_SONAME(64)
800 } 1123 }
801 1124
802 return NULL; 1125 return NULL;
803} 1126}
1127
1128/*
1129 * We support the symbol form:
1130 * [%[modifiers]%][[+-]<symbol name>][,[.....]]
1131 * If the symbol name is empty, then all symbols are matched.
1132 * If the symbol name is a glob ("*"), then all symbols are dumped (debug).
1133 * Do not rely on this output format at all.
1134 * Otherwise the symbol name is used to search (either regex or string compare).
1135 * If the first char of the symbol name is a plus ("+"), then only match
1136 * defined symbols. If it's a minus ("-"), only match undefined symbols.
1137 * Putting modifiers in between the percent signs allows for more in depth
1138 * filters. There are groups of modifiers. If you don't specify a member
1139 * of a group, then all types in that group are matched. The current
1140 * groups and their types are:
1141 * STT group: STT_NOTYPE:n STT_OBJECT:o STT_FUNC:f STT_FILE:F
1142 * STB group: STB_LOCAL:l STB_GLOBAL:g STB_WEAK:w
1143 * SHN group: SHN_UNDEF:u SHN_ABS:a SHN_COMMON:c {defined}:d
1144 * The "defined" value in the SHN group does not correspond to a SHN_xxx define.
1145 * You can search for multiple symbols at once by seperating with a comma (",").
1146 *
1147 * Some examples:
1148 * ELFs with a weak function "foo":
1149 * scanelf -s %wf%foo <ELFs>
1150 * ELFs that define the symbol "main":
1151 * scanelf -s +main <ELFs>
1152 * scanelf -s %d%main <ELFs>
1153 * ELFs that refer to the undefined symbol "brk":
1154 * scanelf -s -brk <ELFs>
1155 * scanelf -s %u%brk <ELFs>
1156 * All global defined objects in an ELF:
1157 * scanelf -s %ogd% <ELF>
1158 */
1159static void
1160scanelf_match_symname(elfobj *elf, char *found_sym, char **ret, size_t *ret_len, const char *symname,
1161 unsigned int stt, unsigned int stb, unsigned int shn, unsigned long size)
1162{
1163 char *this_sym, *next_sym, saved = saved;
1164
1165 /* allow the user to specify a comma delimited list of symbols to search for */
1166 next_sym = NULL;
1167 do {
1168 bool inc_notype, inc_object, inc_func, inc_file,
1169 inc_local, inc_global, inc_weak,
1170 inc_def, inc_undef, inc_abs, inc_common;
1171
1172 if (next_sym) {
1173 next_sym[-1] = saved;
1174 this_sym = next_sym;
1175 } else
1176 this_sym = find_sym;
1177 if ((next_sym = strchr(this_sym, ','))) {
1178 /* make parsing easier by killing the comma temporarily */
1179 saved = *next_sym;
1180 *next_sym = '\0';
1181 next_sym += 1;
1182 }
1183
1184 /* symbol selection! */
1185 inc_notype = inc_object = inc_func = inc_file = \
1186 inc_local = inc_global = inc_weak = \
1187 inc_def = inc_undef = inc_abs = inc_common = \
1188 (*this_sym != '%');
1189
1190 /* parse the contents of %...% */
1191 if (!inc_notype) {
1192 while (*(this_sym++)) {
1193 if (*this_sym == '%') {
1194 ++this_sym;
1195 break;
1196 }
1197 switch (*this_sym) {
1198 case 'n': inc_notype = true; break;
1199 case 'o': inc_object = true; break;
1200 case 'f': inc_func = true; break;
1201 case 'F': inc_file = true; break;
1202 case 'l': inc_local = true; break;
1203 case 'g': inc_global = true; break;
1204 case 'w': inc_weak = true; break;
1205 case 'd': inc_def = true; break;
1206 case 'u': inc_undef = true; break;
1207 case 'a': inc_abs = true; break;
1208 case 'c': inc_common = true; break;
1209 default: err("invalid symbol selector '%c'", *this_sym);
1210 }
1211 }
1212
1213 /* If no types are matched, not match all */
1214 if (!inc_notype && !inc_object && !inc_func && !inc_file)
1215 inc_notype = inc_object = inc_func = inc_file = true;
1216 if (!inc_local && !inc_global && !inc_weak)
1217 inc_local = inc_global = inc_weak = true;
1218 if (!inc_def && !inc_undef && !inc_abs && !inc_common)
1219 inc_def = inc_undef = inc_abs = inc_common = true;
1220
1221 /* backwards compat for defined/undefined short hand */
1222 } else if (*this_sym == '+') {
1223 inc_undef = false;
1224 ++this_sym;
1225 } else if (*this_sym == '-') {
1226 inc_def = inc_abs = inc_common = false;
1227 ++this_sym;
1228 }
1229
1230 /* filter symbols */
1231 if ((!inc_notype && stt == STT_NOTYPE) || \
1232 (!inc_object && stt == STT_OBJECT) || \
1233 (!inc_func && stt == STT_FUNC ) || \
1234 (!inc_file && stt == STT_FILE ) || \
1235 (!inc_local && stb == STB_LOCAL ) || \
1236 (!inc_global && stb == STB_GLOBAL) || \
1237 (!inc_weak && stb == STB_WEAK ) || \
1238 (!inc_def && shn && shn < SHN_LORESERVE) || \
1239 (!inc_undef && shn == SHN_UNDEF ) || \
1240 (!inc_abs && shn == SHN_ABS ) || \
1241 (!inc_common && shn == SHN_COMMON))
1242 continue;
1243
1244 if (*this_sym == '*') {
1245 /* a "*" symbol gets you debug output */
1246 printf("%s(%s) %5lX %15s %15s %15s %s\n",
1247 ((*found_sym == 0) ? "\n\t" : "\t"),
1248 elf->base_filename,
1249 size,
1250 get_elfstttype(stt),
1251 get_elfstbtype(stb),
1252 get_elfshntype(shn),
1253 symname);
1254 goto matched;
1255
1256 } else {
1257 if (g_match) {
1258 /* regex match the symbol */
1259 if (rematch(this_sym, symname, REG_EXTENDED) != 0)
1260 continue;
1261
1262 } else if (*this_sym) {
1263 /* give empty symbols a "pass", else do a normal compare */
1264 const size_t len = strlen(this_sym);
1265 if (!(strncmp(this_sym, symname, len) == 0 &&
1266 /* Accept unversioned symbol names */
1267 (symname[len] == '\0' || symname[len] == '@')))
1268 continue;
1269 }
1270
1271 if (be_semi_verbose) {
1272 char buf[1024];
1273 snprintf(buf, sizeof(buf), "%lX %s %s",
1274 size,
1275 get_elfstttype(stt),
1276 this_sym);
1277 *ret = xstrdup(buf);
1278 } else {
1279 if (*ret) xchrcat(ret, ',', ret_len);
1280 xstrcat(ret, symname, ret_len);
1281 }
1282
1283 goto matched;
1284 }
1285 } while (next_sym);
1286
1287 return;
1288
1289 matched:
1290 *found_sym = 1;
1291 if (next_sym)
1292 next_sym[-1] = saved;
1293}
1294
804static char *scanelf_file_sym(elfobj *elf, char *found_sym) 1295static const char *scanelf_file_sym(elfobj *elf, char *found_sym)
805{ 1296{
806 unsigned long i;
807 char *ret; 1297 char *ret;
808 void *symtab_void, *strtab_void; 1298 void *symtab_void, *strtab_void;
809 1299
810 if (!find_sym) return NULL; 1300 if (!find_sym) return NULL;
811 ret = find_sym; 1301 ret = NULL;
812 1302
813 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void); 1303 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
814 1304
815 if (symtab_void && strtab_void) { 1305 if (symtab_void && strtab_void) {
816#define FIND_SYM(B) \ 1306#define FIND_SYM(B) \
817 if (elf->elf_class == ELFCLASS ## B) { \ 1307 if (elf->elf_class == ELFCLASS ## B) { \
818 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 1308 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
819 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 1309 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
820 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 1310 Elf ## B ## _Sym *sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
821 unsigned long cnt = EGET(symtab->sh_entsize); \ 1311 Elf ## B ## _Word i, cnt = EGET(symtab->sh_entsize); \
822 char *symname; \ 1312 char *symname; \
1313 size_t ret_len = 0; \
823 if (cnt) \ 1314 if (cnt) \
824 cnt = EGET(symtab->sh_size) / cnt; \ 1315 cnt = EGET(symtab->sh_size) / cnt; \
825 for (i = 0; i < cnt; ++i) { \ 1316 for (i = 0; i < cnt; ++i) { \
1317 if ((void*)sym > elf->data_end) { \
1318 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1319 goto break_out; \
1320 } \
826 if (sym->st_name) { \ 1321 if (sym->st_name) { \
1322 /* make sure the symbol name is in acceptable memory range */ \
827 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 1323 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
828 if ((void*)symname > (void*)elf->data_end) { \ 1324 if ((void*)symname > elf->data_end) { \
829 warnf("%s: corrupt ELF symbols", elf->filename); \ 1325 warnf("%s: corrupt ELF symbols", elf->filename); \
1326 ++sym; \
830 continue; \ 1327 continue; \
831 } \ 1328 } \
832 if (*find_sym == '*') { \ 1329 scanelf_match_symname(elf, found_sym, \
833 printf("%s(%s) %5lX %15s %s\n", \ 1330 &ret, &ret_len, symname, \
834 ((*found_sym == 0) ? "\n\t" : "\t"), \ 1331 ELF##B##_ST_TYPE(EGET(sym->st_info)), \
835 elf->base_filename, \ 1332 ELF##B##_ST_BIND(EGET(sym->st_info)), \
836 (unsigned long)sym->st_size, \ 1333 EGET(sym->st_shndx), \
837 get_elfstttype(sym->st_info), \ 1334 /* st_size can be 64bit, but no one is really that big, so screw em */ \
838 symname); \ 1335 EGET(sym->st_size)); \
839 *found_sym = 1; \
840 } else { \
841 char *this_sym, *next_sym; \
842 this_sym = find_sym; \
843 do { \
844 next_sym = strchr(this_sym, ','); \
845 if (next_sym == NULL) \
846 next_sym = this_sym + strlen(this_sym); \
847 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
848 (strcmp(symname, versioned_symname) == 0)) { \
849 ret = this_sym; \
850 (*found_sym)++; \
851 goto break_out; \
852 } \
853 this_sym = next_sym + 1; \
854 } while (*next_sym != '\0'); \
855 } \
856 } \ 1336 } \
857 ++sym; \ 1337 ++sym; \
858 } } 1338 } \
1339 }
859 FIND_SYM(32) 1340 FIND_SYM(32)
860 FIND_SYM(64) 1341 FIND_SYM(64)
861 } 1342 }
862 1343
863break_out: 1344break_out:
866 if (*find_sym != '*' && *found_sym) 1347 if (*find_sym != '*' && *found_sym)
867 return ret; 1348 return ret;
868 if (be_quiet) 1349 if (be_quiet)
869 return NULL; 1350 return NULL;
870 else 1351 else
871 return (char *)" - "; 1352 return " - ";
872} 1353}
873 1354
1355static const char *scanelf_file_sections(elfobj *elf, char *found_section)
1356{
1357 if (!find_section)
1358 return NULL;
1359
1360#define FIND_SECTION(B) \
1361 if (elf->elf_class == ELFCLASS ## B) { \
1362 size_t matched, n; \
1363 int invert; \
1364 const char *section_name; \
1365 Elf ## B ## _Shdr *section; \
1366 \
1367 matched = 0; \
1368 array_for_each(find_section_arr, n, section_name) { \
1369 invert = (*section_name == '!' ? 1 : 0); \
1370 section = SHDR ## B (elf_findsecbyname(elf, section_name + invert)); \
1371 if ((section == NULL && invert) || (section != NULL && !invert)) \
1372 ++matched; \
1373 } \
1374 \
1375 if (matched == array_cnt(find_section_arr)) \
1376 *found_section = 1; \
1377 }
1378 FIND_SECTION(32)
1379 FIND_SECTION(64)
1380
1381 if (be_wewy_wewy_quiet)
1382 return NULL;
1383
1384 if (*found_section)
1385 return find_section;
1386
1387 if (be_quiet)
1388 return NULL;
1389 else
1390 return " - ";
1391}
874 1392
875/* scan an elf file and show all the fun stuff */ 1393/* scan an elf file and show all the fun stuff */
876#define prints(str) write(fileno(stdout), str, strlen(str)) 1394#define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
877static int scanelf_elfobj(elfobj *elf) 1395static int scanelf_elfobj(elfobj *elf)
878{ 1396{
879 unsigned long i; 1397 unsigned long i;
880 char found_pax, found_phdr, found_relro, found_load, found_textrel, 1398 char found_pax, found_phdr, found_relro, found_load, found_textrel,
881 found_rpath, found_needed, found_interp, found_bind, found_soname, 1399 found_rpath, found_needed, found_interp, found_bind, found_soname,
882 found_sym, found_lib, found_file, found_textrels; 1400 found_sym, found_lib, found_file, found_textrels, found_section;
883 static char *out_buffer = NULL; 1401 static char *out_buffer = NULL;
884 static size_t out_len; 1402 static size_t out_len;
885 1403
886 found_pax = found_phdr = found_relro = found_load = found_textrel = \ 1404 found_pax = found_phdr = found_relro = found_load = found_textrel = \
887 found_rpath = found_needed = found_interp = found_bind = found_soname = \ 1405 found_rpath = found_needed = found_interp = found_bind = found_soname = \
888 found_sym = found_lib = found_file = found_textrels = 0; 1406 found_sym = found_lib = found_file = found_textrels = found_section = 0;
889 1407
890 if (be_verbose > 2) 1408 if (be_verbose > 2)
891 printf("%s: scanning file {%s,%s}\n", elf->filename, 1409 printf("%s: scanning file {%s,%s}\n", elf->filename,
892 get_elfeitype(EI_CLASS, elf->elf_class), 1410 get_elfeitype(EI_CLASS, elf->elf_class),
893 get_elfeitype(EI_DATA, elf->data[EI_DATA])); 1411 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
895 printf("%s: scanning file\n", elf->filename); 1413 printf("%s: scanning file\n", elf->filename);
896 1414
897 /* init output buffer */ 1415 /* init output buffer */
898 if (!out_buffer) { 1416 if (!out_buffer) {
899 out_len = sizeof(char) * 80; 1417 out_len = sizeof(char) * 80;
900 out_buffer = (char*)xmalloc(out_len); 1418 out_buffer = xmalloc(out_len);
901 } 1419 }
902 *out_buffer = '\0'; 1420 *out_buffer = '\0';
903 1421
904 /* show the header */ 1422 /* show the header */
905 if (!be_quiet && show_banner) { 1423 if (!be_quiet && show_banner) {
906 for (i = 0; out_format[i]; ++i) { 1424 for (i = 0; out_format[i]; ++i) {
907 if (!IS_MODIFIER(out_format[i])) continue; 1425 if (!IS_MODIFIER(out_format[i])) continue;
908 1426
909 switch (out_format[++i]) { 1427 switch (out_format[++i]) {
1428 case '+': break;
910 case '%': break; 1429 case '%': break;
911 case '#': break; 1430 case '#': break;
912 case 'F': 1431 case 'F':
913 case 'p': 1432 case 'p':
914 case 'f': prints("FILE "); found_file = 1; break; 1433 case 'f': prints("FILE "); found_file = 1; break;
915 case 'o': prints(" TYPE "); break; 1434 case 'o': prints(" TYPE "); break;
916 case 'x': prints(" PAX "); break; 1435 case 'x': prints(" PAX "); break;
917 case 'e': prints("STK/REL/PTL "); break; 1436 case 'e': prints("STK/REL/PTL "); break;
918 case 't': prints("TEXTREL "); break; 1437 case 't': prints("TEXTREL "); break;
919 case 'r': prints("RPATH "); break; 1438 case 'r': prints("RPATH "); break;
1439 case 'M': prints("CLASS "); break;
1440 case 'l':
920 case 'n': prints("NEEDED "); break; 1441 case 'n': prints("NEEDED "); break;
921 case 'i': prints("INTERP "); break; 1442 case 'i': prints("INTERP "); break;
922 case 'b': prints("BIND "); break; 1443 case 'b': prints("BIND "); break;
1444 case 'Z': prints("SIZE "); break;
923 case 'S': prints("SONAME "); break; 1445 case 'S': prints("SONAME "); break;
924 case 's': prints("SYM "); break; 1446 case 's': prints("SYM "); break;
925 case 'N': prints("LIB "); break; 1447 case 'N': prints("LIB "); break;
926 case 'T': prints("TEXTRELS "); break; 1448 case 'T': prints("TEXTRELS "); break;
1449 case 'k': prints("SECTION "); break;
1450 case 'a': prints("ARCH "); break;
1451 case 'I': prints("OSABI "); break;
1452 case 'Y': prints("EABI "); break;
1453 case 'O': prints("PERM "); break;
1454 case 'D': prints("ENDIAN "); break;
927 default: warnf("'%c' has no title ?", out_format[i]); 1455 default: warnf("'%c' has no title ?", out_format[i]);
928 } 1456 }
929 } 1457 }
930 if (!found_file) prints("FILE "); 1458 if (!found_file) prints("FILE ");
931 prints("\n"); 1459 prints("\n");
935 1463
936 /* dump all the good stuff */ 1464 /* dump all the good stuff */
937 for (i = 0; out_format[i]; ++i) { 1465 for (i = 0; out_format[i]; ++i) {
938 const char *out; 1466 const char *out;
939 const char *tmp; 1467 const char *tmp;
940 1468 static char ubuf[sizeof(unsigned long)*2];
941 /* make sure we trim leading spaces in quiet mode */
942 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
943 *out_buffer = '\0';
944
945 if (!IS_MODIFIER(out_format[i])) { 1469 if (!IS_MODIFIER(out_format[i])) {
946 xchrcat(&out_buffer, out_format[i], &out_len); 1470 xchrcat(&out_buffer, out_format[i], &out_len);
947 continue; 1471 continue;
948 } 1472 }
949 1473
950 out = NULL; 1474 out = NULL;
951 be_wewy_wewy_quiet = (out_format[i] == '#'); 1475 be_wewy_wewy_quiet = (out_format[i] == '#');
1476 be_semi_verbose = (out_format[i] == '+');
952 switch (out_format[++i]) { 1477 switch (out_format[++i]) {
1478 case '+':
953 case '%': 1479 case '%':
954 case '#': 1480 case '#':
955 xchrcat(&out_buffer, out_format[i], &out_len); break; 1481 xchrcat(&out_buffer, out_format[i], &out_len); break;
956 case 'F': 1482 case 'F':
957 found_file = 1; 1483 found_file = 1;
983 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1509 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
984 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break; 1510 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
985 case 't': out = scanelf_file_textrel(elf, &found_textrel); break; 1511 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
986 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break; 1512 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
987 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break; 1513 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1514 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1515 case 'D': out = get_endian(elf); break;
1516 case 'O': out = strfileperms(elf->filename); break;
988 case 'n': 1517 case 'n':
989 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break; 1518 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
990 case 'i': out = scanelf_file_interp(elf, &found_interp); break; 1519 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
991 case 'b': out = scanelf_file_bind(elf, &found_bind); break; 1520 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
992 case 'S': out = scanelf_file_soname(elf, &found_soname); break; 1521 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
993 case 's': out = scanelf_file_sym(elf, &found_sym); break; 1522 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1523 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1524 case 'a': out = get_elfemtype(elf); break;
1525 case 'I': out = get_elfosabi(elf); break;
1526 case 'Y': out = get_elf_eabi(elf); break;
1527 case 'Z': snprintf(ubuf, sizeof(ubuf), "%lu", (unsigned long)elf->len); out = ubuf; break;;
994 default: warnf("'%c' has no scan code?", out_format[i]); 1528 default: warnf("'%c' has no scan code?", out_format[i]);
995 } 1529 }
996 if (out) { 1530 if (out)
997 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
998 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
999 xstrncat(&out_buffer, out, &out_len, (tmp-out));
1000 else
1001 xstrcat(&out_buffer, out, &out_len); 1531 xstrcat(&out_buffer, out, &out_len);
1002 }
1003 } 1532 }
1004 1533
1005#define FOUND_SOMETHING() \ 1534#define FOUND_SOMETHING() \
1006 (found_pax || found_phdr || found_relro || found_load || found_textrel || \ 1535 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1007 found_rpath || found_needed || found_interp || found_bind || \ 1536 found_rpath || found_needed || found_interp || found_bind || \
1008 found_soname || found_sym || found_lib || found_textrels) 1537 found_soname || found_sym || found_lib || found_textrels || found_section )
1009 1538
1010 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) { 1539 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1011 xchrcat(&out_buffer, ' ', &out_len); 1540 xchrcat(&out_buffer, ' ', &out_len);
1012 xstrcat(&out_buffer, elf->filename, &out_len); 1541 xstrcat(&out_buffer, elf->filename, &out_len);
1013 } 1542 }
1020} 1549}
1021 1550
1022/* scan a single elf */ 1551/* scan a single elf */
1023static int scanelf_elf(const char *filename, int fd, size_t len) 1552static int scanelf_elf(const char *filename, int fd, size_t len)
1024{ 1553{
1025 int ret; 1554 int ret = 1;
1026 elfobj *elf; 1555 elfobj *elf;
1027 1556
1028 /* verify this is real ELF */ 1557 /* verify this is real ELF */
1029 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) { 1558 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1030 if (be_verbose > 2) printf("%s: not an ELF\n", filename); 1559 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1031 return 1; 1560 return 2;
1032 } 1561 }
1033 1562 switch (match_bits) {
1563 case 32:
1564 if (elf->elf_class != ELFCLASS32)
1565 goto label_done;
1566 break;
1567 case 64:
1568 if (elf->elf_class != ELFCLASS64)
1569 goto label_done;
1570 break;
1571 default: break;
1572 }
1034 if (strlen(match_etypes)) { 1573 if (match_etypes) {
1035 char sbuf[126]; 1574 char sbuf[126];
1036 strncpy(sbuf, match_etypes, sizeof(sbuf)); 1575 strncpy(sbuf, match_etypes, sizeof(sbuf));
1037 if (strchr(match_etypes, ',') != NULL) { 1576 if (strchr(match_etypes, ',') != NULL) {
1038 char *p; 1577 char *p;
1039 while((p = strrchr(sbuf, ',')) != NULL) { 1578 while ((p = strrchr(sbuf, ',')) != NULL) {
1040 *p = 0; 1579 *p = 0;
1041 if (atoi(p+1) == get_etype(elf)) 1580 if (etype_lookup(p+1) == get_etype(elf))
1042 goto label_ret; 1581 goto label_ret;
1043 } 1582 }
1044 } 1583 }
1045 if (atoi(sbuf) != get_etype(elf)) { 1584 if (etype_lookup(sbuf) != get_etype(elf))
1046 ret = 1;
1047 goto label_done; 1585 goto label_done;
1048 }
1049 } 1586 }
1050 1587
1051label_ret: 1588label_ret:
1052 ret = scanelf_elfobj(elf); 1589 ret = scanelf_elfobj(elf);
1053 1590
1066 1603
1067 ar = ar_open_fd(filename, fd); 1604 ar = ar_open_fd(filename, fd);
1068 if (ar == NULL) 1605 if (ar == NULL)
1069 return 1; 1606 return 1;
1070 1607
1071 ar_buffer = (char*)mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0); 1608 ar_buffer = mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1072 while ((m=ar_next(ar)) != NULL) { 1609 while ((m = ar_next(ar)) != NULL) {
1610 off_t cur_pos = lseek(fd, 0, SEEK_CUR);
1611 if (cur_pos == -1)
1612 errp("lseek() failed");
1073 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size); 1613 elf = readelf_buffer(m->name, ar_buffer + cur_pos, m->size);
1074 if (elf) { 1614 if (elf) {
1075 scanelf_elfobj(elf); 1615 scanelf_elfobj(elf);
1076 unreadelf(elf); 1616 unreadelf(elf);
1077 } 1617 }
1078 } 1618 }
1079 munmap(ar_buffer, len); 1619 munmap(ar_buffer, len);
1080 1620
1081 return 0; 1621 return 0;
1082} 1622}
1083/* scan a file which may be an elf or an archive or some other magical beast */ 1623/* scan a file which may be an elf or an archive or some other magical beast */
1084static void scanelf_file(const char *filename) 1624static int scanelf_fileat(int dir_fd, const char *filename, const struct stat *st_cache)
1085{ 1625{
1626 const struct stat *st = st_cache;
1086 struct stat st; 1627 struct stat symlink_st;
1087 int fd; 1628 int fd;
1088 1629
1089 /* make sure 'filename' exists */
1090 if (lstat(filename, &st) == -1) {
1091 if (be_verbose > 2) printf("%s: does not exist\n", filename);
1092 return;
1093 }
1094
1095 /* always handle regular files and handle symlinked files if no -y */ 1630 /* always handle regular files and handle symlinked files if no -y */
1096 if (S_ISLNK(st.st_mode)) { 1631 if (S_ISLNK(st->st_mode)) {
1097 if (!scan_symlink) return; 1632 if (!scan_symlink)
1098 stat(filename, &st); 1633 return 1;
1634 fstatat(dir_fd, filename, &symlink_st, 0);
1635 st = &symlink_st;
1099 } 1636 }
1637
1100 if (!S_ISREG(st.st_mode)) { 1638 if (!S_ISREG(st->st_mode)) {
1101 if (be_verbose > 2) printf("%s: skipping non-file\n", filename); 1639 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1102 return; 1640 return 1;
1103 } 1641 }
1104 1642
1105 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1) 1643 if (match_perms) {
1644 if ((st->st_mode | match_perms) != st->st_mode)
1645 return 1;
1646 }
1647 fd = openat(dir_fd, filename, (fix_elf ? O_RDWR : O_RDONLY) | O_CLOEXEC);
1648 if (fd == -1)
1106 return; 1649 return 1;
1107 1650
1108 if (scanelf_elf(filename, fd, st.st_size) == 1 && scan_archives) 1651 if (scanelf_elf(filename, fd, st->st_size) == 2) {
1109 /* if it isn't an ELF, maybe it's an .a archive */ 1652 /* if it isn't an ELF, maybe it's an .a archive */
1653 if (scan_archives)
1110 scanelf_archive(filename, fd, st.st_size); 1654 scanelf_archive(filename, fd, st->st_size);
1111 1655
1656 /*
1657 * unreadelf() implicitly closes its fd, so only close it
1658 * when we are returning it in the non-ELF case
1659 */
1112 close(fd); 1660 close(fd);
1661 }
1662
1663 return 0;
1113} 1664}
1114 1665
1115/* scan a directory for ET_EXEC files and print when we find one */ 1666/* scan a directory for ET_EXEC files and print when we find one */
1116static void scanelf_dir(const char *path) 1667static int scanelf_dirat(int dir_fd, const char *path)
1117{ 1668{
1118 register DIR *dir; 1669 register DIR *dir;
1119 register struct dirent *dentry; 1670 register struct dirent *dentry;
1120 struct stat st_top, st; 1671 struct stat st_top, st;
1121 char buf[__PAX_UTILS_PATH_MAX]; 1672 char buf[__PAX_UTILS_PATH_MAX], *subpath;
1122 size_t pathlen = 0, len = 0; 1673 size_t pathlen = 0, len = 0;
1674 int ret = 0;
1675 int subdir_fd;
1123 1676
1124 /* make sure path exists */ 1677 /* make sure path exists */
1125 if (lstat(path, &st_top) == -1) { 1678 if (fstatat(dir_fd, path, &st_top, AT_SYMLINK_NOFOLLOW) == -1) {
1126 if (be_verbose > 2) printf("%s: does not exist\n", path); 1679 if (be_verbose > 2) printf("%s: does not exist\n", path);
1127 return; 1680 return 1;
1128 } 1681 }
1129 1682
1130 /* ok, if it isn't a directory, assume we can open it */ 1683 /* ok, if it isn't a directory, assume we can open it */
1131 if (!S_ISDIR(st_top.st_mode)) { 1684 if (!S_ISDIR(st_top.st_mode))
1132 scanelf_file(path); 1685 return scanelf_fileat(dir_fd, path, &st_top);
1133 return;
1134 }
1135 1686
1136 /* now scan the dir looking for fun stuff */ 1687 /* now scan the dir looking for fun stuff */
1137 if ((dir = opendir(path)) == NULL) { 1688 subdir_fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
1138 warnf("could not opendir %s: %s", path, strerror(errno)); 1689 if (subdir_fd == -1)
1690 dir = NULL;
1691 else
1692 dir = fdopendir(subdir_fd);
1693 if (dir == NULL) {
1694 if (subdir_fd != -1)
1695 close(subdir_fd);
1696 warnfp("could not opendir(%s)", path);
1139 return; 1697 return 1;
1140 } 1698 }
1141 if (be_verbose > 1) printf("%s: scanning dir\n", path); 1699 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1142 1700
1143 pathlen = strlen(path); 1701 subpath = stpcpy(buf, path);
1702 if (subpath[-1] != '/')
1703 *subpath++ = '/';
1704 pathlen = subpath - buf;
1144 while ((dentry = readdir(dir))) { 1705 while ((dentry = readdir(dir))) {
1145 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1706 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1146 continue; 1707 continue;
1708
1709 if (fstatat(subdir_fd, dentry->d_name, &st, AT_SYMLINK_NOFOLLOW) == -1)
1710 continue;
1711
1147 len = (pathlen + 1 + strlen(dentry->d_name) + 1); 1712 len = strlen(dentry->d_name);
1148 if (len >= sizeof(buf)) { 1713 if (len + pathlen + 1 >= sizeof(buf)) {
1149 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path, 1714 warnf("Skipping '%s%s': len > sizeof(buf); %zu > %zu\n",
1150 (unsigned long)len, (unsigned long)sizeof(buf)); 1715 path, dentry->d_name, len + pathlen + 1, sizeof(buf));
1151 continue; 1716 continue;
1152 } 1717 }
1153 sprintf(buf, "%s/%s", path, dentry->d_name); 1718 memcpy(subpath, dentry->d_name, len);
1154 if (lstat(buf, &st) != -1) { 1719 subpath[len] = '\0';
1720
1155 if (S_ISREG(st.st_mode)) 1721 if (S_ISREG(st.st_mode))
1156 scanelf_file(buf); 1722 ret = scanelf_fileat(dir_fd, buf, &st);
1157 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1723 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1158 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1724 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1159 scanelf_dir(buf); 1725 ret = scanelf_dirat(dir_fd, buf);
1160 }
1161 } 1726 }
1162 } 1727 }
1163 closedir(dir); 1728 closedir(dir);
1164}
1165 1729
1730 return ret;
1731}
1732static int scanelf_dir(const char *path)
1733{
1734 return scanelf_dirat(root_fd, root_rel_path(path));
1735}
1736
1166static int scanelf_from_file(char *filename) 1737static int scanelf_from_file(const char *filename)
1167{ 1738{
1168 FILE *fp = NULL; 1739 FILE *fp;
1169 char *p; 1740 char *p, *path;
1170 char path[__PAX_UTILS_PATH_MAX]; 1741 size_t len;
1742 int ret;
1171 1743
1172 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL)) 1744 if (strcmp(filename, "-") == 0)
1173 fp = stdin; 1745 fp = stdin;
1174 else if ((fp = fopen(filename, "r")) == NULL) 1746 else if ((fp = fopen(filename, "r")) == NULL)
1175 return 1; 1747 return 1;
1176 1748
1177 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) { 1749 path = NULL;
1750 len = 0;
1751 ret = 0;
1752 while (getline(&path, &len, fp) != -1) {
1178 if ((p = strchr(path, '\n')) != NULL) 1753 if ((p = strchr(path, '\n')) != NULL)
1179 *p = 0; 1754 *p = 0;
1180 search_path = path; 1755 search_path = path;
1181 scanelf_dir(path); 1756 ret = scanelf_dir(path);
1182 } 1757 }
1758 free(path);
1759
1183 if (fp != stdin) 1760 if (fp != stdin)
1184 fclose(fp); 1761 fclose(fp);
1762
1185 return 0; 1763 return ret;
1186} 1764}
1187 1765
1188static void load_ld_so_conf() 1766#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1767
1768static int _load_ld_cache_config(const char *fname)
1189{ 1769{
1190 FILE *fp = NULL; 1770 FILE *fp = NULL;
1191 char *p; 1771 char *p, *path;
1192 char path[__PAX_UTILS_PATH_MAX]; 1772 size_t len;
1193 int i = 0; 1773 int curr_fd = -1;
1194 1774
1195 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1775 fp = fopenat_r(root_fd, root_rel_path(fname));
1776 if (fp == NULL)
1196 return; 1777 return -1;
1197 1778
1198 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) { 1779 path = NULL;
1199 if (*path != '/') 1780 len = 0;
1200 continue; 1781 while (getline(&path, &len, fp) != -1) {
1201
1202 if ((p = strrchr(path, '\r')) != NULL) 1782 if ((p = strrchr(path, '\r')) != NULL)
1203 *p = 0; 1783 *p = 0;
1204 if ((p = strchr(path, '\n')) != NULL) 1784 if ((p = strchr(path, '\n')) != NULL)
1205 *p = 0; 1785 *p = 0;
1206 1786
1207 ldpaths[i++] = xstrdup(path); 1787 /* recursive includes of the same file will make this segfault. */
1788 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1789 glob_t gl;
1790 size_t x;
1791 const char *gpath;
1208 1792
1209 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths)) 1793 /* re-use existing path buffer ... need to be creative */
1210 break; 1794 if (path[8] != '/')
1795 gpath = memcpy(path + 3, "/etc/", 5);
1796 else
1797 gpath = path + 8;
1798 if (root_fd != AT_FDCWD) {
1799 if (curr_fd == -1) {
1800 curr_fd = open(".", O_RDONLY|O_CLOEXEC);
1801 if (fchdir(root_fd))
1802 errp("unable to change to root dir");
1803 }
1804 gpath = root_rel_path(gpath);
1805 }
1806
1807 if (glob(gpath, 0, NULL, &gl) == 0) {
1808 for (x = 0; x < gl.gl_pathc; ++x) {
1809 /* try to avoid direct loops */
1810 if (strcmp(gl.gl_pathv[x], fname) == 0)
1811 continue;
1812 _load_ld_cache_config(gl.gl_pathv[x]);
1813 }
1814 globfree(&gl);
1815 }
1816
1817 /* failed globs are ignored by glibc */
1818 continue;
1211 } 1819 }
1212 ldpaths[i] = NULL; 1820
1821 if (*path != '/')
1822 continue;
1823
1824 xarraypush_str(ldpaths, path);
1825 }
1826 free(path);
1213 1827
1214 fclose(fp); 1828 fclose(fp);
1829
1830 if (curr_fd != -1) {
1831 if (fchdir(curr_fd))
1832 /* don't care */;
1833 close(curr_fd);
1834 }
1835
1836 return 0;
1837}
1838
1839#elif defined(__FreeBSD__) || defined(__DragonFly__)
1840
1841static int _load_ld_cache_config(const char *fname)
1842{
1843 FILE *fp = NULL;
1844 char *b = NULL, *p;
1845 struct elfhints_hdr hdr;
1846
1847 fp = fopenat_r(root_fd, root_rel_path(fname));
1848 if (fp == NULL)
1849 return -1;
1850
1851 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1852 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1853 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1854 {
1855 fclose(fp);
1856 return -1;
1857 }
1858
1859 b = xmalloc(hdr.dirlistlen + 1);
1860 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1861 fclose(fp);
1862 free(b);
1863 return -1;
1864 }
1865
1866 while ((p = strsep(&b, ":"))) {
1867 if (*p == '\0')
1868 continue;
1869 xarraypush_str(ldpaths, p);
1870 }
1871
1872 free(b);
1873 fclose(fp);
1874 return 0;
1875}
1876
1877#else
1878#ifdef __ELF__
1879#warning Cache config support not implemented for your target
1880#endif
1881static int _load_ld_cache_config(const char *fname)
1882{
1883 return 0;
1884}
1885#endif
1886
1887static void load_ld_cache_config(const char *fname)
1888{
1889 bool scan_l, scan_ul, scan_ull;
1890 size_t n;
1891 const char *ldpath;
1892
1893 _load_ld_cache_config(fname);
1894
1895 scan_l = scan_ul = scan_ull = false;
1896 if (array_cnt(ldpaths)) {
1897 array_for_each(ldpaths, n, ldpath) {
1898 if (!scan_l && !strcmp(ldpath, "/lib")) scan_l = true;
1899 if (!scan_ul && !strcmp(ldpath, "/usr/lib")) scan_ul = true;
1900 if (!scan_ull && !strcmp(ldpath, "/usr/local/lib")) scan_ull = true;
1901 }
1902 }
1903
1904 if (!scan_l) xarraypush_str(ldpaths, "/lib");
1905 if (!scan_ul) xarraypush_str(ldpaths, "/usr/lib");
1906 if (!scan_ull) xarraypush_str(ldpaths, "/usr/local/lib");
1215} 1907}
1216 1908
1217/* scan /etc/ld.so.conf for paths */ 1909/* scan /etc/ld.so.conf for paths */
1218static void scanelf_ldpath() 1910static void scanelf_ldpath(void)
1219{ 1911{
1220 char scan_l, scan_ul, scan_ull; 1912 size_t n;
1221 int i = 0; 1913 const char *ldpath;
1222 1914
1223 if (!ldpaths[0]) 1915 array_for_each(ldpaths, n, ldpath)
1224 err("Unable to load any paths from ld.so.conf");
1225
1226 scan_l = scan_ul = scan_ull = 0;
1227
1228 while (ldpaths[i]) {
1229 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
1230 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
1231 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
1232 scanelf_dir(ldpaths[i]); 1916 scanelf_dir(ldpath);
1233 ++i;
1234 }
1235
1236 if (!scan_l) scanelf_dir("/lib");
1237 if (!scan_ul) scanelf_dir("/usr/lib");
1238 if (!scan_ull) scanelf_dir("/usr/local/lib");
1239} 1917}
1240 1918
1241/* scan env PATH for paths */ 1919/* scan env PATH for paths */
1242static void scanelf_envpath() 1920static void scanelf_envpath(void)
1243{ 1921{
1244 char *path, *p; 1922 char *path, *p;
1245 1923
1246 path = getenv("PATH"); 1924 path = getenv("PATH");
1247 if (!path) 1925 if (!path)
1254 } 1932 }
1255 1933
1256 free(path); 1934 free(path);
1257} 1935}
1258 1936
1259 1937/* usage / invocation handling functions */ /* Free Flags: c d j u w G H J K P Q U W */
1260/* usage / invocation handling functions */
1261#define PARSE_FLAGS "plRmyAXxetrnLibSs:gN:TaqvF:f:o:E:BhV" 1938#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZCBhV"
1262#define a_argument required_argument 1939#define a_argument required_argument
1263static struct option const long_opts[] = { 1940static struct option const long_opts[] = {
1264 {"path", no_argument, NULL, 'p'}, 1941 {"path", no_argument, NULL, 'p'},
1265 {"ldpath", no_argument, NULL, 'l'}, 1942 {"ldpath", no_argument, NULL, 'l'},
1943 {"use-ldpath",no_argument, NULL, 129},
1944 {"root", a_argument, NULL, 128},
1266 {"recursive", no_argument, NULL, 'R'}, 1945 {"recursive", no_argument, NULL, 'R'},
1267 {"mount", no_argument, NULL, 'm'}, 1946 {"mount", no_argument, NULL, 'm'},
1268 {"symlink", no_argument, NULL, 'y'}, 1947 {"symlink", no_argument, NULL, 'y'},
1269 {"archives", no_argument, NULL, 'A'}, 1948 {"archives", no_argument, NULL, 'A'},
1270 {"ldcache", no_argument, NULL, 'L'}, 1949 {"ldcache", no_argument, NULL, 'L'},
1271 {"fix", no_argument, NULL, 'X'}, 1950 {"fix", no_argument, NULL, 'X'},
1951 {"setpax", a_argument, NULL, 'z'},
1272 {"pax", no_argument, NULL, 'x'}, 1952 {"pax", no_argument, NULL, 'x'},
1273 {"header", no_argument, NULL, 'e'}, 1953 {"header", no_argument, NULL, 'e'},
1274 {"textrel", no_argument, NULL, 't'}, 1954 {"textrel", no_argument, NULL, 't'},
1275 {"rpath", no_argument, NULL, 'r'}, 1955 {"rpath", no_argument, NULL, 'r'},
1276 {"needed", no_argument, NULL, 'n'}, 1956 {"needed", no_argument, NULL, 'n'},
1277 {"interp", no_argument, NULL, 'i'}, 1957 {"interp", no_argument, NULL, 'i'},
1278 {"bind", no_argument, NULL, 'b'}, 1958 {"bind", no_argument, NULL, 'b'},
1279 {"soname", no_argument, NULL, 'S'}, 1959 {"soname", no_argument, NULL, 'S'},
1280 {"symbol", a_argument, NULL, 's'}, 1960 {"symbol", a_argument, NULL, 's'},
1961 {"section", a_argument, NULL, 'k'},
1281 {"lib", a_argument, NULL, 'N'}, 1962 {"lib", a_argument, NULL, 'N'},
1282 {"gmatch", no_argument, NULL, 'g'}, 1963 {"gmatch", no_argument, NULL, 'g'},
1283 {"textrels", no_argument, NULL, 'T'}, 1964 {"textrels", no_argument, NULL, 'T'},
1284 {"etype", a_argument, NULL, 'E'}, 1965 {"etype", a_argument, NULL, 'E'},
1966 {"bits", a_argument, NULL, 'M'},
1967 {"endian", no_argument, NULL, 'D'},
1968 {"osabi", no_argument, NULL, 'I'},
1969 {"eabi", no_argument, NULL, 'Y'},
1970 {"perms", a_argument, NULL, 'O'},
1971 {"size", no_argument, NULL, 'Z'},
1285 {"all", no_argument, NULL, 'a'}, 1972 {"all", no_argument, NULL, 'a'},
1286 {"quiet", no_argument, NULL, 'q'}, 1973 {"quiet", no_argument, NULL, 'q'},
1287 {"verbose", no_argument, NULL, 'v'}, 1974 {"verbose", no_argument, NULL, 'v'},
1288 {"format", a_argument, NULL, 'F'}, 1975 {"format", a_argument, NULL, 'F'},
1289 {"from", a_argument, NULL, 'f'}, 1976 {"from", a_argument, NULL, 'f'},
1290 {"file", a_argument, NULL, 'o'}, 1977 {"file", a_argument, NULL, 'o'},
1978 {"nocolor", no_argument, NULL, 'C'},
1291 {"nobanner", no_argument, NULL, 'B'}, 1979 {"nobanner", no_argument, NULL, 'B'},
1292 {"help", no_argument, NULL, 'h'}, 1980 {"help", no_argument, NULL, 'h'},
1293 {"version", no_argument, NULL, 'V'}, 1981 {"version", no_argument, NULL, 'V'},
1294 {NULL, no_argument, NULL, 0x0} 1982 {NULL, no_argument, NULL, 0x0}
1295}; 1983};
1296 1984
1297static const char *opts_help[] = { 1985static const char * const opts_help[] = {
1298 "Scan all directories in PATH environment", 1986 "Scan all directories in PATH environment",
1299 "Scan all directories in /etc/ld.so.conf", 1987 "Scan all directories in /etc/ld.so.conf",
1988 "Use ld.so.conf to show full path (use with -r/-n)",
1989 "Root directory (use with -l or -p)",
1300 "Scan directories recursively", 1990 "Scan directories recursively",
1301 "Don't recursively cross mount points", 1991 "Don't recursively cross mount points",
1302 "Don't scan symlinks", 1992 "Don't scan symlinks",
1303 "Scan archives (.a files)", 1993 "Scan archives (.a files)",
1304 "Utilize ld.so.cache information (use with -r/-n)", 1994 "Utilize ld.so.cache to show full path (use with -r/-n)",
1305 "Try and 'fix' bad things (use with -r/-e)\n", 1995 "Try and 'fix' bad things (use with -r/-e)",
1996 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1306 "Print PaX markings", 1997 "Print PaX markings",
1307 "Print GNU_STACK/PT_LOAD markings", 1998 "Print GNU_STACK/PT_LOAD markings",
1308 "Print TEXTREL information", 1999 "Print TEXTREL information",
1309 "Print RPATH information", 2000 "Print RPATH information",
1310 "Print NEEDED information", 2001 "Print NEEDED information",
1311 "Print INTERP information", 2002 "Print INTERP information",
1312 "Print BIND information", 2003 "Print BIND information",
1313 "Print SONAME information", 2004 "Print SONAME information",
1314 "Find a specified symbol", 2005 "Find a specified symbol",
2006 "Find a specified section",
1315 "Find a specified library", 2007 "Find a specified library",
1316 "Use strncmp to match libraries. (use with -N)", 2008 "Use regex matching rather than string compare (use with -s)",
1317 "Locate cause of TEXTREL", 2009 "Locate cause of TEXTREL",
2010 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1318 "Print only ELF files matching numeric constant", 2011 "Print only ELF files matching numeric bits",
1319 "Print all scanned info (-x -e -t -r -b)\n", 2012 "Print Endianness",
2013 "Print OSABI",
2014 "Print EABI (EM_ARM Only)",
2015 "Print only ELF files matching octal permissions",
2016 "Print ELF file size",
2017 "Print all useful/simple info\n",
1320 "Only output 'bad' things", 2018 "Only output 'bad' things",
1321 "Be verbose (can be specified more than once)", 2019 "Be verbose (can be specified more than once)",
1322 "Use specified format for output", 2020 "Use specified format for output",
1323 "Read input stream from a filename", 2021 "Read input stream from a filename",
1324 "Write output stream to a filename", 2022 "Write output stream to a filename",
2023 "Don't emit color in output",
1325 "Don't display the header", 2024 "Don't display the header",
1326 "Print this help and exit", 2025 "Print this help and exit",
1327 "Print version and exit", 2026 "Print version and exit",
1328 NULL 2027 NULL
1329}; 2028};
1333{ 2032{
1334 unsigned long i; 2033 unsigned long i;
1335 printf("* Scan ELF binaries for stuff\n\n" 2034 printf("* Scan ELF binaries for stuff\n\n"
1336 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0); 2035 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1337 printf("Options: -[%s]\n", PARSE_FLAGS); 2036 printf("Options: -[%s]\n", PARSE_FLAGS);
1338 for (i = 0; long_opts[i].name; ++i) 2037 for (i = 0; long_opts[i].name; ++i) {
2038 /* first output the short flag if it has one */
2039 if (long_opts[i].val > '~')
2040 printf(" ");
2041 else
2042 printf(" -%c, ", long_opts[i].val);
2043
2044 /* then the long flag */
1339 if (long_opts[i].has_arg == no_argument) 2045 if (long_opts[i].has_arg == no_argument)
1340 printf(" -%c, --%-13s* %s\n", long_opts[i].val, 2046 printf("--%-14s", long_opts[i].name);
1341 long_opts[i].name, opts_help[i]);
1342 else 2047 else
1343 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val, 2048 printf("--%-7s <arg> ", long_opts[i].name);
1344 long_opts[i].name, opts_help[i]);
1345 2049
1346 if (status != EXIT_SUCCESS) 2050 /* finally the help text */
1347 exit(status); 2051 printf("* %s\n", opts_help[i]);
2052 }
1348 2053
1349 puts("\nThe format modifiers for the -F option are:"); 2054 puts("\nFor more information, see the scanelf(1) manpage");
1350 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1351 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1352 puts(" i INTERP \tb BIND \ts symbol");
1353 puts(" N library \to Type \tT TEXTRELs");
1354 puts(" S SONAME");
1355 puts(" p filename (with search path removed)");
1356 puts(" f filename (short name/basename)");
1357 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1358
1359 exit(status); 2055 exit(status);
1360} 2056}
1361 2057
1362/* parse command line arguments and preform needed actions */ 2058/* parse command line arguments and preform needed actions */
2059#define do_pax_state(option, flag) \
2060 if (islower(option)) { \
2061 flags &= ~PF_##flag; \
2062 flags |= PF_NO##flag; \
2063 } else { \
2064 flags &= ~PF_NO##flag; \
2065 flags |= PF_##flag; \
2066 }
1363static void parseargs(int argc, char *argv[]) 2067static int parseargs(int argc, char *argv[])
1364{ 2068{
1365 int i; 2069 int i;
1366 char *from_file = NULL; 2070 const char *from_file = NULL;
2071 int ret = 0;
2072 char load_cache_config = 0;
1367 2073
1368 opterr = 0; 2074 opterr = 0;
1369 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 2075 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1370 switch (i) { 2076 switch (i) {
1371 2077
1379 case 'f': 2085 case 'f':
1380 if (from_file) warn("You prob don't want to specify -f twice"); 2086 if (from_file) warn("You prob don't want to specify -f twice");
1381 from_file = optarg; 2087 from_file = optarg;
1382 break; 2088 break;
1383 case 'E': 2089 case 'E':
1384 strncpy(match_etypes, optarg, sizeof(match_etypes)); 2090 match_etypes = optarg;
2091 break;
2092 case 'M':
2093 match_bits = atoi(optarg);
2094 if (match_bits == 0) {
2095 if (strcmp(optarg, "ELFCLASS32") == 0)
2096 match_bits = 32;
2097 if (strcmp(optarg, "ELFCLASS64") == 0)
2098 match_bits = 64;
2099 }
2100 break;
2101 case 'O':
2102 if (sscanf(optarg, "%o", &match_perms) == -1)
2103 match_bits = 0;
1385 break; 2104 break;
1386 case 'o': { 2105 case 'o': {
1387 FILE *fp = NULL;
1388 if ((fp = freopen(optarg, "w", stdout)) == NULL) 2106 if (freopen(optarg, "w", stdout) == NULL)
1389 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 2107 errp("Could not freopen(%s)", optarg);
1390 SET_STDOUT(fp);
1391 break; 2108 break;
1392 } 2109 }
1393 2110 case 'k':
2111 xarraypush_str(find_section_arr, optarg);
2112 break;
1394 case 's': { 2113 case 's': {
1395 if (find_sym) warn("You prob don't want to specify -s twice"); 2114 if (find_sym) warn("You prob don't want to specify -s twice");
1396 find_sym = optarg; 2115 find_sym = optarg;
1397 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1398 sprintf(versioned_symname, "%s@", find_sym);
1399 break; 2116 break;
1400 } 2117 }
1401 case 'N': { 2118 case 'N':
1402 if (find_lib) warn("You prob don't want to specify -N twice"); 2119 xarraypush_str(find_lib_arr, optarg);
1403 find_lib = optarg;
1404 break; 2120 break;
1405 }
1406
1407 case 'F': { 2121 case 'F': {
1408 if (out_format) warn("You prob don't want to specify -F twice"); 2122 if (out_format) warn("You prob don't want to specify -F twice");
1409 out_format = optarg; 2123 out_format = optarg;
1410 break; 2124 break;
1411 } 2125 }
2126 case 'z': {
2127 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
2128 size_t x;
1412 2129
1413 case 'g': gmatch = 1; /* break; any reason we dont breal; here ? */ 2130 for (x = 0; x < strlen(optarg); x++) {
2131 switch (optarg[x]) {
2132 case 'p':
2133 case 'P':
2134 do_pax_state(optarg[x], PAGEEXEC);
2135 break;
2136 case 's':
2137 case 'S':
2138 do_pax_state(optarg[x], SEGMEXEC);
2139 break;
2140 case 'm':
2141 case 'M':
2142 do_pax_state(optarg[x], MPROTECT);
2143 break;
2144 case 'e':
2145 case 'E':
2146 do_pax_state(optarg[x], EMUTRAMP);
2147 break;
2148 case 'r':
2149 case 'R':
2150 do_pax_state(optarg[x], RANDMMAP);
2151 break;
2152 case 'x':
2153 case 'X':
2154 do_pax_state(optarg[x], RANDEXEC);
2155 break;
2156 default:
2157 break;
2158 }
2159 }
2160 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
2161 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
2162 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
2163 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
2164 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
2165 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
2166 setpax = flags;
2167 break;
2168 }
2169 case 'Z': show_size = 1; break;
1414 case 'L': use_ldcache = 1; break; 2170 case 'g': g_match = 1; break;
2171 case 'L': load_cache_config = use_ldcache = 1; break;
1415 case 'y': scan_symlink = 0; break; 2172 case 'y': scan_symlink = 0; break;
1416 case 'A': scan_archives = 1; break; 2173 case 'A': scan_archives = 1; break;
2174 case 'C': color_init(true); break;
1417 case 'B': show_banner = 0; break; 2175 case 'B': show_banner = 0; break;
1418 case 'l': scan_ldpath = 1; break; 2176 case 'l': load_cache_config = scan_ldpath = 1; break;
1419 case 'p': scan_envpath = 1; break; 2177 case 'p': scan_envpath = 1; break;
1420 case 'R': dir_recurse = 1; break; 2178 case 'R': dir_recurse = 1; break;
1421 case 'm': dir_crossmount = 0; break; 2179 case 'm': dir_crossmount = 0; break;
1422 case 'X': ++fix_elf; break; 2180 case 'X': ++fix_elf; break;
1423 case 'x': show_pax = 1; break; 2181 case 'x': show_pax = 1; break;
1429 case 'b': show_bind = 1; break; 2187 case 'b': show_bind = 1; break;
1430 case 'S': show_soname = 1; break; 2188 case 'S': show_soname = 1; break;
1431 case 'T': show_textrels = 1; break; 2189 case 'T': show_textrels = 1; break;
1432 case 'q': be_quiet = 1; break; 2190 case 'q': be_quiet = 1; break;
1433 case 'v': be_verbose = (be_verbose % 20) + 1; break; 2191 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1434 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break; 2192 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
1435 2193 case 'D': show_endian = 1; break;
2194 case 'I': show_osabi = 1; break;
2195 case 'Y': show_eabi = 1; break;
2196 case 128:
2197 root_fd = open(optarg, O_RDONLY|O_CLOEXEC);
2198 if (root_fd == -1)
2199 err("Could not open root: %s", optarg);
2200 break;
2201 case 129: load_cache_config = use_ldpath = 1; break;
1436 case ':': 2202 case ':':
1437 err("Option '%c' is missing parameter", optopt); 2203 err("Option '%c' is missing parameter", optopt);
1438 case '?': 2204 case '?':
1439 err("Unknown option '%c' or argument missing", optopt); 2205 err("Unknown option '%c' or argument missing", optopt);
1440 default: 2206 default:
1441 err("Unhandled option '%c'; please report this", i); 2207 err("Unhandled option '%c'; please report this", i);
1442 } 2208 }
1443 } 2209 }
1444 2210 if (show_textrels && be_verbose)
2211 has_objdump = bin_in_path("objdump");
2212 /* flatten arrays for display */
2213 if (array_cnt(find_lib_arr))
2214 find_lib = array_flatten_str(find_lib_arr);
2215 if (array_cnt(find_section_arr))
2216 find_section = array_flatten_str(find_section_arr);
1445 /* let the format option override all other options */ 2217 /* let the format option override all other options */
1446 if (out_format) { 2218 if (out_format) {
1447 show_pax = show_phdr = show_textrel = show_rpath = \ 2219 show_pax = show_phdr = show_textrel = show_rpath = \
1448 show_needed = show_interp = show_bind = show_soname = \ 2220 show_needed = show_interp = show_bind = show_soname = \
1449 show_textrels = 0; 2221 show_textrels = show_perms = show_endian = show_size = \
2222 show_osabi = show_eabi = 0;
1450 for (i = 0; out_format[i]; ++i) { 2223 for (i = 0; out_format[i]; ++i) {
1451 if (!IS_MODIFIER(out_format[i])) continue; 2224 if (!IS_MODIFIER(out_format[i])) continue;
1452 2225
1453 switch (out_format[++i]) { 2226 switch (out_format[++i]) {
2227 case '+': break;
1454 case '%': break; 2228 case '%': break;
1455 case '#': break; 2229 case '#': break;
1456 case 'F': break; 2230 case 'F': break;
1457 case 'p': break; 2231 case 'p': break;
1458 case 'f': break; 2232 case 'f': break;
2233 case 'k': break;
1459 case 's': break; 2234 case 's': break;
1460 case 'N': break; 2235 case 'N': break;
1461 case 'o': break; 2236 case 'o': break;
2237 case 'a': break;
2238 case 'M': break;
2239 case 'Z': show_size = 1; break;
2240 case 'D': show_endian = 1; break;
2241 case 'I': show_osabi = 1; break;
2242 case 'Y': show_eabi = 1; break;
2243 case 'O': show_perms = 1; break;
1462 case 'x': show_pax = 1; break; 2244 case 'x': show_pax = 1; break;
1463 case 'e': show_phdr = 1; break; 2245 case 'e': show_phdr = 1; break;
1464 case 't': show_textrel = 1; break; 2246 case 't': show_textrel = 1; break;
1465 case 'r': show_rpath = 1; break; 2247 case 'r': show_rpath = 1; break;
1466 case 'n': show_needed = 1; break; 2248 case 'n': show_needed = 1; break;
1467 case 'i': show_interp = 1; break; 2249 case 'i': show_interp = 1; break;
1468 case 'b': show_bind = 1; break; 2250 case 'b': show_bind = 1; break;
1469 case 'S': show_soname = 1; break; 2251 case 'S': show_soname = 1; break;
1470 case 'T': show_textrels = 1; break; 2252 case 'T': show_textrels = 1; break;
1471 default: 2253 default:
1472 err("Invalid format specifier '%c' (byte %i)", 2254 err("invalid format specifier '%c' (byte %i)",
1473 out_format[i], i+1); 2255 out_format[i], i+1);
1474 } 2256 }
1475 } 2257 }
1476 2258
1477 /* construct our default format */ 2259 /* construct our default format */
1478 } else { 2260 } else {
1479 size_t fmt_len = 30; 2261 size_t fmt_len = 30;
1480 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 2262 out_format = xmalloc(sizeof(char) * fmt_len);
2263 *out_format = '\0';
1481 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 2264 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1482 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len); 2265 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
2266 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
2267 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
2268 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
2269 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
2270 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
1483 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len); 2271 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1484 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 2272 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1485 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 2273 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1486 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 2274 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1487 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 2275 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1488 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len); 2276 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1489 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len); 2277 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1490 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len); 2278 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1491 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len); 2279 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
2280 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1492 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len); 2281 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1493 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 2282 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1494 } 2283 }
1495 if (be_verbose > 2) printf("Format: %s\n", out_format); 2284 if (be_verbose > 2) printf("Format: %s\n", out_format);
1496 2285
1497 /* now lets actually do the scanning */ 2286 /* now lets actually do the scanning */
1498 if (scan_ldpath || use_ldcache) 2287 if (load_cache_config)
1499 load_ld_so_conf(); 2288 load_ld_cache_config(__PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
1500 if (scan_ldpath) scanelf_ldpath(); 2289 if (scan_ldpath) scanelf_ldpath();
1501 if (scan_envpath) scanelf_envpath(); 2290 if (scan_envpath) scanelf_envpath();
2291 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
2292 from_file = "-";
1502 if (from_file) { 2293 if (from_file) {
1503 scanelf_from_file(from_file); 2294 scanelf_from_file(from_file);
1504 from_file = *argv; 2295 from_file = *argv;
1505 } 2296 }
1506 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file) 2297 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1507 err("Nothing to scan !?"); 2298 err("Nothing to scan !?");
1508 while (optind < argc) { 2299 while (optind < argc) {
1509 search_path = argv[optind++]; 2300 search_path = argv[optind++];
1510 scanelf_dir(search_path); 2301 ret = scanelf_dir(search_path);
1511 } 2302 }
1512 2303
1513 /* clean up */ 2304 /* clean up */
1514 if (versioned_symname) free(versioned_symname);
1515 for (i = 0; ldpaths[i]; ++i)
1516 free(ldpaths[i]); 2305 xarrayfree(ldpaths);
2306 xarrayfree(find_lib_arr);
2307 xarrayfree(find_section_arr);
2308 free(find_lib);
2309 free(find_section);
1517 2310
1518 if (ldcache != 0) 2311 if (ldcache != 0)
1519 munmap(ldcache, ldcache_size); 2312 munmap(ldcache, ldcache_size);
1520}
1521
1522
1523
1524/* utility funcs */
1525static char *xstrdup(const char *s)
1526{
1527 char *ret = strdup(s);
1528 if (!ret) err("Could not strdup(): %s", strerror(errno));
1529 return ret; 2313 return ret;
1530} 2314}
1531static void *xmalloc(size_t size)
1532{
1533 void *ret = malloc(size);
1534 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1535 return ret;
1536}
1537static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
1538{
1539 size_t new_len;
1540 2315
1541 new_len = strlen(*dst) + strlen(src); 2316static char **get_split_env(const char *envvar)
1542 if (*curr_len <= new_len) {
1543 *curr_len = new_len + (*curr_len / 2);
1544 *dst = realloc(*dst, *curr_len);
1545 if (!*dst)
1546 err("could not realloc() %li bytes", (unsigned long)*curr_len);
1547 }
1548
1549 if (n)
1550 strncat(*dst, src, n);
1551 else
1552 strcat(*dst, src);
1553}
1554static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1555{ 2317{
1556 static char my_app[2]; 2318 const char *delims = " \t\n";
1557 my_app[0] = append; 2319 char **envvals = NULL;
1558 my_app[1] = '\0'; 2320 char *env, *s;
1559 xstrcat(dst, my_app, curr_len); 2321 int nentry;
1560}
1561 2322
2323 if ((env = getenv(envvar)) == NULL)
2324 return NULL;
1562 2325
2326 env = xstrdup(env);
2327 if (env == NULL)
2328 return NULL;
2329
2330 s = strtok(env, delims);
2331 if (s == NULL) {
2332 free(env);
2333 return NULL;
2334 }
2335
2336 nentry = 0;
2337 while (s != NULL) {
2338 ++nentry;
2339 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
2340 envvals[nentry-1] = s;
2341 s = strtok(NULL, delims);
2342 }
2343 envvals[nentry] = NULL;
2344
2345 /* don't want to free(env) as it contains the memory that backs
2346 * the envvals array of strings */
2347 return envvals;
2348}
2349
2350static void parseenv(void)
2351{
2352 color_init(false);
2353 qa_textrels = get_split_env("QA_TEXTRELS");
2354 qa_execstack = get_split_env("QA_EXECSTACK");
2355 qa_wx_load = get_split_env("QA_WX_LOAD");
2356}
2357
2358#ifdef __PAX_UTILS_CLEANUP
2359static void cleanup(void)
2360{
2361 free(out_format);
2362 free(qa_textrels);
2363 free(qa_execstack);
2364 free(qa_wx_load);
2365}
2366#endif
1563 2367
1564int main(int argc, char *argv[]) 2368int main(int argc, char *argv[])
1565{ 2369{
2370 int ret;
1566 if (argc < 2) 2371 if (argc < 2)
1567 usage(EXIT_FAILURE); 2372 usage(EXIT_FAILURE);
2373 parseenv();
1568 parseargs(argc, argv); 2374 ret = parseargs(argc, argv);
1569 fclose(stdout); 2375 fclose(stdout);
1570#ifdef __BOUNDS_CHECKING_ON 2376#ifdef __PAX_UTILS_CLEANUP
1571 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()"); 2377 cleanup();
2378 warn("The calls to add/delete heap should be off:\n"
2379 "\t- 1 due to the out_buffer not being freed in scanelf_fileat()\n"
2380 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
1572#endif 2381#endif
1573 return EXIT_SUCCESS; 2382 return ret;
1574} 2383}
2384
2385/* Match filename against entries in matchlist, return TRUE
2386 * if the file is listed */
2387static int file_matches_list(const char *filename, char **matchlist)
2388{
2389 char **file;
2390 char *match;
2391 char buf[__PAX_UTILS_PATH_MAX];
2392
2393 if (matchlist == NULL)
2394 return 0;
2395
2396 for (file = matchlist; *file != NULL; file++) {
2397 if (search_path) {
2398 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2399 match = buf;
2400 } else {
2401 match = *file;
2402 }
2403 if (fnmatch(match, filename, 0) == 0)
2404 return 1;
2405 }
2406 return 0;
2407}

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