/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.119 Revision 1.240
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 1.240 2012/01/23 23:48:54 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 1.240 2012/01/23 23:48:54 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)
300 }
301
302 if (fix_elf && setpax) {
303 /* set the chpax settings */
304 if (elf->elf_class == ELFCLASS32) {
305 if (EHDR32(elf->ehdr)->e_type == ET_DYN || EHDR32(elf->ehdr)->e_type == ET_EXEC)
306 ESET(EHDR32(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
307 } else {
308 if (EHDR64(elf->ehdr)->e_type == ET_DYN || EHDR64(elf->ehdr)->e_type == ET_EXEC)
309 ESET(EHDR64(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
310 }
124 } 311 }
125 312
126 /* fall back to EI_PAX if no PT_PAX was found */ 313 /* fall back to EI_PAX if no PT_PAX was found */
127 if (!*ret) { 314 if (!*ret) {
128 static char *paxflags; 315 static char *paxflags;
163 uint32_t flags, check_flags; \ 350 uint32_t flags, check_flags; \
164 if (elf->phdr != NULL) { \ 351 if (elf->phdr != NULL) { \
165 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 352 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
166 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \ 353 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
167 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \ 354 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
355 if (multi_stack++) \
168 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \ 356 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
357 if (file_matches_list(elf->filename, qa_execstack)) \
358 continue; \
169 found = found_phdr; \ 359 found = found_phdr; \
170 offset = 0; \ 360 offset = 0; \
171 check_flags = PF_X; \ 361 check_flags = PF_X; \
172 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \ 362 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
363 if (multi_relro++) \
173 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \ 364 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
174 found = found_relro; \ 365 found = found_relro; \
175 offset = 4; \ 366 offset = 4; \
176 check_flags = PF_X; \ 367 check_flags = PF_X; \
177 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \ 368 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
178 if (ehdr->e_type == ET_DYN || ehdr->e_type == ET_EXEC) \ 369 if (EGET(ehdr->e_type) == ET_DYN || EGET(ehdr->e_type) == ET_EXEC) \
370 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); \ 371 warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
372 if (file_matches_list(elf->filename, qa_wx_load)) \
373 continue; \
180 found = found_load; \ 374 found = found_load; \
181 offset = 8; \ 375 offset = 8; \
182 check_flags = PF_W|PF_X; \ 376 check_flags = PF_W|PF_X; \
183 } else \ 377 } else \
184 continue; \ 378 continue; \
185 flags = EGET(phdr[i].p_flags); \ 379 flags = EGET(phdr[i].p_flags); \
186 if (be_quiet && ((flags & check_flags) != check_flags)) \ 380 if (be_quiet && ((flags & check_flags) != check_flags)) \
187 continue; \ 381 continue; \
188 if (fix_elf && ((flags & PF_X) != flags)) { \ 382 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)); \ 383 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
190 ret[3] = ret[7] = '!'; \ 384 ret[3] = ret[7] = '!'; \
191 flags = EGET(phdr[i].p_flags); \ 385 flags = EGET(phdr[i].p_flags); \
192 } \ 386 } \
193 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \ 387 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
197 } else if (elf->shdr != NULL) { \ 391 } else if (elf->shdr != NULL) { \
198 /* no program headers which means this is prob an object file */ \ 392 /* no program headers which means this is prob an object file */ \
199 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \ 393 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
200 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \ 394 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
201 char *str; \ 395 char *str; \
202 if ((void*)strtbl > (void*)elf->data_end) \ 396 if ((void*)strtbl > elf->data_end) \
203 goto skip_this_shdr##B; \ 397 goto skip_this_shdr##B; \
204 check_flags = SHF_WRITE|SHF_EXECINSTR; \ 398 check_flags = SHF_WRITE|SHF_EXECINSTR; \
205 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \ 399 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
206 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \ 400 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
207 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \ 401 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
221 break; \ 415 break; \
222 } \ 416 } \
223 } \ 417 } \
224 skip_this_shdr##B: \ 418 skip_this_shdr##B: \
225 if (!multi_stack) { \ 419 if (!multi_stack) { \
420 if (file_matches_list(elf->filename, qa_execstack)) \
421 return NULL; \
226 *found_phdr = 1; \ 422 *found_phdr = 1; \
227 shown = 1; \ 423 shown = 1; \
228 memcpy(ret, "!WX", 3); \ 424 memcpy(ret, "!WX", 3); \
229 } \ 425 } \
230 } \ 426 } \
235 if (be_wewy_wewy_quiet || (be_quiet && !shown)) 431 if (be_wewy_wewy_quiet || (be_quiet && !shown))
236 return NULL; 432 return NULL;
237 else 433 else
238 return ret; 434 return ret;
239} 435}
436
437/*
438 * See if this ELF contains a DT_TEXTREL tag in any of its
439 * PT_DYNAMIC sections.
440 */
240static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 441static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
241{ 442{
242 static const char *ret = "TEXTREL"; 443 static const char *ret = "TEXTREL";
243 unsigned long i; 444 unsigned long i;
244 445
245 if (!show_textrel && !show_textrels) return NULL; 446 if (!show_textrel && !show_textrels) return NULL;
447
448 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
246 449
247 if (elf->phdr) { 450 if (elf->phdr) {
248#define SHOW_TEXTREL(B) \ 451#define SHOW_TEXTREL(B) \
249 if (elf->elf_class == ELFCLASS ## B) { \ 452 if (elf->elf_class == ELFCLASS ## B) { \
250 Elf ## B ## _Dyn *dyn; \ 453 Elf ## B ## _Dyn *dyn; \
251 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 454 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
252 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 455 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
253 Elf ## B ## _Off offset; \ 456 Elf ## B ## _Off offset; \
254 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 457 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
255 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 458 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
256 offset = EGET(phdr[i].p_offset); \ 459 offset = EGET(phdr[i].p_offset); \
257 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 460 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
258 dyn = DYN ## B (elf->data + offset); \ 461 dyn = DYN ## B (elf->vdata + offset); \
259 while (EGET(dyn->d_tag) != DT_NULL) { \ 462 while (EGET(dyn->d_tag) != DT_NULL) { \
260 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \ 463 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
261 *found_textrel = 1; \ 464 *found_textrel = 1; \
262 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \ 465 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
263 return (be_wewy_wewy_quiet ? NULL : ret); \ 466 return (be_wewy_wewy_quiet ? NULL : ret); \
272 if (be_quiet || be_wewy_wewy_quiet) 475 if (be_quiet || be_wewy_wewy_quiet)
273 return NULL; 476 return NULL;
274 else 477 else
275 return " - "; 478 return " - ";
276} 479}
480
481/*
482 * Scan the .text section to see if there are any relocations in it.
483 * Should rewrite this to check PT_LOAD sections that are marked
484 * Executable rather than the section named '.text'.
485 */
277static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel) 486static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
278{ 487{
279 unsigned long s, r, rmax; 488 unsigned long s, r, rmax;
280 void *symtab_void, *strtab_void, *text_void; 489 void *symtab_void, *strtab_void, *text_void;
281 490
302 Elf ## B ## _Rela *rela; \ 511 Elf ## B ## _Rela *rela; \
303 /* search the section headers for relocations */ \ 512 /* search the section headers for relocations */ \
304 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \ 513 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
305 uint32_t sh_type = EGET(shdr[s].sh_type); \ 514 uint32_t sh_type = EGET(shdr[s].sh_type); \
306 if (sh_type == SHT_REL) { \ 515 if (sh_type == SHT_REL) { \
307 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \ 516 rel = REL ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
308 rela = NULL; \ 517 rela = NULL; \
309 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \ 518 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
310 } else if (sh_type == SHT_RELA) { \ 519 } else if (sh_type == SHT_RELA) { \
311 rel = NULL; \ 520 rel = NULL; \
312 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \ 521 rela = RELA ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
313 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \ 522 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
314 } else \ 523 } else \
315 continue; \ 524 continue; \
316 /* now see if any of the relocs are in the .text */ \ 525 /* now see if any of the relocs are in the .text */ \
317 for (r = 0; r < rmax; ++r) { \ 526 for (r = 0; r < rmax; ++r) { \
332 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \ 541 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
333 if (be_verbose <= 2) continue; \ 542 if (be_verbose <= 2) continue; \
334 } else \ 543 } else \
335 *found_textrels = 1; \ 544 *found_textrels = 1; \
336 /* locate this relocation symbol name */ \ 545 /* locate this relocation symbol name */ \
337 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 546 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
338 if ((void*)sym > (void*)elf->data_end) { \ 547 if ((void*)sym > elf->data_end) { \
339 warn("%s: corrupt ELF symbol", elf->filename); \ 548 warn("%s: corrupt ELF symbol", elf->filename); \
340 continue; \ 549 continue; \
341 } \ 550 } \
342 sym_max = ELF ## B ## _R_SYM(r_info); \ 551 sym_max = ELF ## B ## _R_SYM(r_info); \
343 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \ 552 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
346 sym = NULL; \ 555 sym = NULL; \
347 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 556 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
348 /* show the raw details about this reloc */ \ 557 /* show the raw details about this reloc */ \
349 printf(" %s: ", elf->base_filename); \ 558 printf(" %s: ", elf->base_filename); \
350 if (sym && sym->st_name) \ 559 if (sym && sym->st_name) \
351 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \ 560 printf("%s", elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
352 else \ 561 else \
353 printf("(memory/fake?)"); \ 562 printf("(memory/data?)"); \
354 printf(" [0x%lX]", (unsigned long)r_offset); \ 563 printf(" [0x%lX]", (unsigned long)r_offset); \
355 /* now try to find the closest symbol that this rel is probably in */ \ 564 /* now try to find the closest symbol that this rel is probably in */ \
356 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 565 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
357 func = NULL; \ 566 func = NULL; \
358 offset_tmp = 0; \ 567 offset_tmp = 0; \
359 while (sym_max--) { \ 568 while (sym_max--) { \
360 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \ 569 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
361 func = sym; \ 570 func = sym; \
362 offset_tmp = EGET(sym->st_value); \ 571 offset_tmp = EGET(sym->st_value); \
363 } \ 572 } \
364 ++sym; \ 573 ++sym; \
365 } \ 574 } \
366 printf(" in "); \ 575 printf(" in "); \
367 if (func && func->st_name) \ 576 if (func && func->st_name) { \
368 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \ 577 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
578 if (r_offset > EGET(func->st_size)) \
579 printf("(optimized out: previous %s)", func_name); \
369 else \ 580 else \
370 printf("(NULL: fake?)"); \ 581 printf("%s", func_name); \
582 } else \
583 printf("(optimized out)"); \
371 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \ 584 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
585 if (be_verbose && has_objdump) { \
586 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
587 char *sysbuf; \
588 size_t syslen; \
589 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"; \
590 syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
591 sysbuf = xmalloc(syslen); \
592 if (end_addr < r_offset) \
593 /* not uncommon when things are optimized out */ \
594 end_addr = r_offset + 0x100; \
595 snprintf(sysbuf, syslen, sysfmt, \
596 (unsigned long)offset_tmp, \
597 (unsigned long)end_addr, \
598 elf->filename, \
599 (unsigned long)r_offset); \
600 fflush(stdout); \
601 if (system(sysbuf)) /* don't care */; \
602 fflush(stdout); \
603 free(sysbuf); \
604 } \
372 } \ 605 } \
373 } } 606 } }
374 SHOW_TEXTRELS(32) 607 SHOW_TEXTRELS(32)
375 SHOW_TEXTRELS(64) 608 SHOW_TEXTRELS(64)
376 } 609 }
378 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename); 611 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
379 612
380 return NULL; 613 return NULL;
381} 614}
382 615
383static void rpath_security_checks(elfobj *, char *, const char *);
384static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type) 616static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
385{ 617{
386 struct stat st; 618 struct stat st;
387 switch (*item) { 619 switch (*item) {
388 case '/': break; 620 case '/': break;
394 warnf("Security problem NULL %s in %s", dt_type, elf->filename); 626 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
395 break; 627 break;
396 case '$': 628 case '$':
397 if (fstat(elf->fd, &st) != -1) 629 if (fstat(elf->fd, &st) != -1)
398 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID)) 630 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", 631 warnf("Security problem with %s='%s' in %s with mode set of %o",
400 dt_type, item, elf->filename, st.st_mode & 07777); 632 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
401 break; 633 break;
402 default: 634 default:
403 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename); 635 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
404 break; 636 break;
405 } 637 }
406} 638}
407static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len) 639static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
408{ 640{
409 unsigned long i, s; 641 unsigned long i;
410 char *rpath, *runpath, **r; 642 char *rpath, *runpath, **r;
411 void *strtbl_void; 643 void *strtbl_void;
412 644
413 if (!show_rpath) return; 645 if (!show_rpath) return;
414 646
425 Elf ## B ## _Off offset; \ 657 Elf ## B ## _Off offset; \
426 Elf ## B ## _Xword word; \ 658 Elf ## B ## _Xword word; \
427 /* Scan all the program headers */ \ 659 /* Scan all the program headers */ \
428 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 660 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
429 /* Just scan dynamic headers */ \ 661 /* Just scan dynamic headers */ \
430 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 662 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
431 offset = EGET(phdr[i].p_offset); \ 663 offset = EGET(phdr[i].p_offset); \
432 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 664 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
433 /* Just scan dynamic RPATH/RUNPATH headers */ \ 665 /* Just scan dynamic RPATH/RUNPATH headers */ \
434 dyn = DYN ## B (elf->data + offset); \ 666 dyn = DYN ## B (elf->vdata + offset); \
435 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \ 667 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
436 if (word == DT_RPATH) { \ 668 if (word == DT_RPATH) { \
437 r = &rpath; \ 669 r = &rpath; \
438 } else if (word == DT_RUNPATH) { \ 670 } else if (word == DT_RUNPATH) { \
439 r = &runpath; \ 671 r = &runpath; \
443 } \ 675 } \
444 /* Verify the memory is somewhat sane */ \ 676 /* Verify the memory is somewhat sane */ \
445 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 677 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
446 if (offset < (Elf ## B ## _Off)elf->len) { \ 678 if (offset < (Elf ## B ## _Off)elf->len) { \
447 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \ 679 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
448 *r = (char*)(elf->data + offset); \ 680 *r = elf->data + offset; \
449 /* cache the length in case we need to nuke this section later on */ \ 681 /* cache the length in case we need to nuke this section later on */ \
450 if (fix_elf) \ 682 if (fix_elf) \
451 offset = strlen(*r); \ 683 offset = strlen(*r); \
452 /* If quiet, don't output paths in ld.so.conf */ \ 684 /* If quiet, don't output paths in ld.so.conf */ \
453 if (be_quiet) { \ 685 if (be_quiet) { \
459 /* scan each path in : delimited list */ \ 691 /* scan each path in : delimited list */ \
460 while (start) { \ 692 while (start) { \
461 rpath_security_checks(elf, start, get_elfdtype(word)); \ 693 rpath_security_checks(elf, start, get_elfdtype(word)); \
462 end = strchr(start, ':'); \ 694 end = strchr(start, ':'); \
463 len = (end ? abs(end - start) : strlen(start)); \ 695 len = (end ? abs(end - start) : strlen(start)); \
464 if (use_ldcache) \ 696 if (use_ldcache) { \
465 for (s = 0; ldpaths[s]; ++s) \ 697 size_t n; \
698 const char *ldpath; \
699 array_for_each(ldpaths, n, ldpath) \
466 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \ 700 if (!strncmp(ldpath, start, len) && !ldpath[len]) { \
467 *r = end; \ 701 *r = end; \
468 /* corner case ... if RPATH reads "/usr/lib:", we want \ 702 /* corner case ... if RPATH reads "/usr/lib:", we want \
469 * to show ':' rather than '' */ \ 703 * to show ':' rather than '' */ \
470 if (end && end[1] != '\0') \ 704 if (end && end[1] != '\0') \
471 (*r)++; \ 705 (*r)++; \
472 break; \ 706 break; \
473 } \ 707 } \
708 } \
474 if (!*r || !end) \ 709 if (!*r || !end) \
475 break; \ 710 break; \
476 else \ 711 else \
477 start = start + len + 1; \ 712 start = start + len + 1; \
478 } \ 713 } \
563#define FLAG_S390_LIB64 0x0400 798#define FLAG_S390_LIB64 0x0400
564#define FLAG_POWERPC_LIB64 0x0500 799#define FLAG_POWERPC_LIB64 0x0500
565#define FLAG_MIPS64_LIBN32 0x0600 800#define FLAG_MIPS64_LIBN32 0x0600
566#define FLAG_MIPS64_LIBN64 0x0700 801#define FLAG_MIPS64_LIBN64 0x0700
567 802
568static char *lookup_cache_lib(elfobj *, char *); 803#if defined(__GLIBC__) || defined(__UCLIBC__)
804
569static char *lookup_cache_lib(elfobj *elf, char *fname) 805static char *lookup_cache_lib(elfobj *elf, const char *fname)
570{ 806{
571 int fd = 0; 807 int fd;
572 char *strs; 808 char *strs;
573 static char buf[__PAX_UTILS_PATH_MAX] = ""; 809 static char buf[__PAX_UTILS_PATH_MAX] = "";
574 const char *cachefile = "/etc/ld.so.cache"; 810 const char *cachefile = root_rel_path("/etc/ld.so.cache");
575 struct stat st; 811 struct stat st;
576 812
577 typedef struct { 813 typedef struct {
578 char magic[LDSO_CACHE_MAGIC_LEN]; 814 char magic[LDSO_CACHE_MAGIC_LEN];
579 char version[LDSO_CACHE_VER_LEN]; 815 char version[LDSO_CACHE_VER_LEN];
589 libentry_t *libent; 825 libentry_t *libent;
590 826
591 if (fname == NULL) 827 if (fname == NULL)
592 return NULL; 828 return NULL;
593 829
594 if (ldcache == 0) { 830 if (ldcache == NULL) {
595 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1) 831 if (fstatat(root_fd, cachefile, &st, 0))
832 return NULL;
833
834 fd = openat(root_fd, cachefile, O_RDONLY);
835 if (fd == -1)
596 return NULL; 836 return NULL;
597 837
598 /* cache these values so we only map/unmap the cache file once */ 838 /* cache these values so we only map/unmap the cache file once */
599 ldcache_size = st.st_size; 839 ldcache_size = st.st_size;
600 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0); 840 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
601
602 close(fd); 841 close(fd);
603 842
604 if (ldcache == (caddr_t)-1) { 843 if (ldcache == MAP_FAILED) {
605 ldcache = 0; 844 ldcache = NULL;
606 return NULL; 845 return NULL;
607 } 846 }
608 847
609 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN)) 848 if (memcmp(header->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN) ||
849 memcmp(header->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
850 {
851 munmap(ldcache, ldcache_size);
852 ldcache = NULL;
610 return NULL; 853 return NULL;
611 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
612 return NULL;
613 } 854 }
855 } else
856 header = ldcache;
614 857
615 header = (header_t *) ldcache;
616 libent = (libentry_t *) (ldcache + sizeof(header_t)); 858 libent = ldcache + sizeof(header_t);
617 strs = (char *) &libent[header->nlibs]; 859 strs = (char *) &libent[header->nlibs];
618 860
619 for (fd = 0; fd < header->nlibs; fd++) { 861 for (fd = 0; fd < header->nlibs; ++fd) {
620 /* this should be more fine grained, but for now we assume that 862 /* This should be more fine grained, but for now we assume that
621 * diff arches will not be cached together. and we ignore the 863 * diff arches will not be cached together, and we ignore the
622 * the different multilib mips cases. */ 864 * the different multilib mips cases.
865 */
623 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK)) 866 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
624 continue; 867 continue;
625 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK)) 868 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
626 continue; 869 continue;
627 870
628 if (strcmp(fname, strs + libent[fd].sooffset) != 0) 871 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
629 continue; 872 continue;
873
874 /* Return first hit because that is how the ldso rolls */
630 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf)); 875 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
876 break;
631 } 877 }
878
632 return buf; 879 return buf;
633} 880}
634 881
882#elif defined(__NetBSD__)
883static char *lookup_cache_lib(elfobj *elf, const char *fname)
884{
885 static char buf[__PAX_UTILS_PATH_MAX] = "";
886 static struct stat st;
887 size_t n;
888 char *ldpath;
889
890 array_for_each(ldpath, n, ldpath) {
891 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", ldpath, fname) >= sizeof(buf))
892 continue; /* if the pathname is too long, or something went wrong, ignore */
893
894 if (stat(buf, &st) != 0)
895 continue; /* if the lib doesn't exist in *ldpath, look further */
896
897 /* NetBSD doesn't actually do sanity checks, it just loads the file
898 * and if that doesn't work, continues looking in other directories.
899 * This cannot easily be safely emulated, unfortunately. For now,
900 * just assume that if it exists, it's a valid library. */
901
902 return buf;
903 }
904
905 /* not found in any path */
906 return NULL;
907}
908#else
909#ifdef __ELF__
910#warning Cache support not implemented for your target
911#endif
912static char *lookup_cache_lib(elfobj *elf, const char *fname)
913{
914 return NULL;
915}
916#endif
917
918static char *lookup_config_lib(elfobj *elf, char *fname)
919{
920 static char buf[__PAX_UTILS_PATH_MAX] = "";
921 const char *ldpath;
922 size_t n;
923
924 array_for_each(ldpaths, n, ldpath) {
925 snprintf(buf, sizeof(buf), "%s/%s", root_rel_path(ldpath), fname);
926 if (faccessat(root_fd, buf, F_OK, AT_SYMLINK_NOFOLLOW) == 0)
927 return buf;
928 }
929
930 return NULL;
931}
635 932
636static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len) 933static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
637{ 934{
638 unsigned long i; 935 unsigned long i;
639 char *needed; 936 char *needed;
640 void *strtbl_void; 937 void *strtbl_void;
641 char *p; 938 char *p;
642 939
940 /*
941 * -n -> op==0 -> print all
942 * -N -> op==1 -> print requested
943 */
643 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL; 944 if ((op == 0 && !show_needed) || (op == 1 && !find_lib))
945 return NULL;
644 946
645 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 947 strtbl_void = elf_findsecbyname(elf, ".dynstr");
646 948
647 if (elf->phdr && strtbl_void) { 949 if (elf->phdr && strtbl_void) {
648#define SHOW_NEEDED(B) \ 950#define SHOW_NEEDED(B) \
650 Elf ## B ## _Dyn *dyn; \ 952 Elf ## B ## _Dyn *dyn; \
651 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 953 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
652 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 954 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
653 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 955 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
654 Elf ## B ## _Off offset; \ 956 Elf ## B ## _Off offset; \
957 size_t matched = 0; \
958 /* Walk all the program headers to find the PT_DYNAMIC */ \
655 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 959 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
656 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 960 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) \
961 continue; \
657 offset = EGET(phdr[i].p_offset); \ 962 offset = EGET(phdr[i].p_offset); \
658 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 963 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
964 continue; \
965 /* Walk all the dynamic tags to find NEEDED entries */ \
659 dyn = DYN ## B (elf->data + offset); \ 966 dyn = DYN ## B (elf->vdata + offset); \
660 while (EGET(dyn->d_tag) != DT_NULL) { \ 967 while (EGET(dyn->d_tag) != DT_NULL) { \
661 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 968 if (EGET(dyn->d_tag) == DT_NEEDED) { \
662 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 969 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
663 if (offset >= (Elf ## B ## _Off)elf->len) { \ 970 if (offset >= (Elf ## B ## _Off)elf->len) { \
664 ++dyn; \ 971 ++dyn; \
665 continue; \ 972 continue; \
666 } \ 973 } \
667 needed = (char*)(elf->data + offset); \ 974 needed = elf->data + offset; \
668 if (op == 0) { \ 975 if (op == 0) { \
976 /* -n -> print all entries */ \
669 if (!be_wewy_wewy_quiet) { \ 977 if (!be_wewy_wewy_quiet) { \
670 if (*found_needed) xchrcat(ret, ',', ret_len); \ 978 if (*found_needed) xchrcat(ret, ',', ret_len); \
671 if (use_ldcache) \ 979 if (use_ldpath) { \
980 if ((p = lookup_config_lib(elf, needed)) != NULL) \
981 needed = p; \
982 } else if (use_ldcache) { \
672 if ((p = lookup_cache_lib(elf, needed)) != NULL) \ 983 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
673 needed = p; \ 984 needed = p; \
985 } \
674 xstrcat(ret, needed, ret_len); \ 986 xstrcat(ret, needed, ret_len); \
675 } \ 987 } \
676 *found_needed = 1; \ 988 *found_needed = 1; \
677 } else { \ 989 } else { \
678 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \ 990 /* -N -> print matching entries */ \
991 size_t n; \
992 const char *find_lib_name; \
993 \
994 array_for_each(find_lib_arr, n, find_lib_name) { \
995 int invert = 1; \
996 if (find_lib_name[0] == '!') \
997 invert = 0, ++find_lib_name; \
998 if (!strcmp(find_lib_name, needed) == invert) \
999 ++matched; \
1000 } \
1001 \
1002 if (matched == array_cnt(find_lib_arr)) { \
679 *found_lib = 1; \ 1003 *found_lib = 1; \
680 return (be_wewy_wewy_quiet ? NULL : needed); \ 1004 return (be_wewy_wewy_quiet ? NULL : find_lib); \
681 } \ 1005 } \
682 } \ 1006 } \
683 } \ 1007 } \
684 ++dyn; \ 1008 ++dyn; \
685 } \ 1009 } \
714} 1038}
715static char *scanelf_file_bind(elfobj *elf, char *found_bind) 1039static char *scanelf_file_bind(elfobj *elf, char *found_bind)
716{ 1040{
717 unsigned long i; 1041 unsigned long i;
718 struct stat s; 1042 struct stat s;
1043 char dynamic = 0;
719 1044
720 if (!show_bind) return NULL; 1045 if (!show_bind) return NULL;
721 if (!elf->phdr) return NULL; 1046 if (!elf->phdr) return NULL;
722 1047
723#define SHOW_BIND(B) \ 1048#define SHOW_BIND(B) \
725 Elf ## B ## _Dyn *dyn; \ 1050 Elf ## B ## _Dyn *dyn; \
726 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 1051 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
727 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 1052 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
728 Elf ## B ## _Off offset; \ 1053 Elf ## B ## _Off offset; \
729 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 1054 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
730 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 1055 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1056 dynamic = 1; \
731 offset = EGET(phdr[i].p_offset); \ 1057 offset = EGET(phdr[i].p_offset); \
732 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 1058 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
733 dyn = DYN ## B (elf->data + offset); \ 1059 dyn = DYN ## B (elf->vdata + offset); \
734 while (EGET(dyn->d_tag) != DT_NULL) { \ 1060 while (EGET(dyn->d_tag) != DT_NULL) { \
735 if (EGET(dyn->d_tag) == DT_BIND_NOW || \ 1061 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
736 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \ 1062 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
737 { \ 1063 { \
738 if (be_quiet) return NULL; \ 1064 if (be_quiet) return NULL; \
746 SHOW_BIND(32) 1072 SHOW_BIND(32)
747 SHOW_BIND(64) 1073 SHOW_BIND(64)
748 1074
749 if (be_wewy_wewy_quiet) return NULL; 1075 if (be_wewy_wewy_quiet) return NULL;
750 1076
1077 /* 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)) { 1078 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
752 return NULL; 1079 return NULL;
753 } else { 1080 } else {
754 *found_bind = 1; 1081 *found_bind = 1;
755 return (char *) "LAZY"; 1082 return (char *)(dynamic ? "LAZY" : "STATIC");
756 } 1083 }
757} 1084}
758static char *scanelf_file_soname(elfobj *elf, char *found_soname) 1085static char *scanelf_file_soname(elfobj *elf, char *found_soname)
759{ 1086{
760 unsigned long i; 1087 unsigned long i;
772 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 1099 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
773 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 1100 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
774 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 1101 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
775 Elf ## B ## _Off offset; \ 1102 Elf ## B ## _Off offset; \
776 /* only look for soname in shared objects */ \ 1103 /* only look for soname in shared objects */ \
777 if (ehdr->e_type != ET_DYN) \ 1104 if (EGET(ehdr->e_type) != ET_DYN) \
778 return NULL; \ 1105 return NULL; \
779 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 1106 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
780 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 1107 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
781 offset = EGET(phdr[i].p_offset); \ 1108 offset = EGET(phdr[i].p_offset); \
782 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 1109 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
783 dyn = DYN ## B (elf->data + offset); \ 1110 dyn = DYN ## B (elf->vdata + offset); \
784 while (EGET(dyn->d_tag) != DT_NULL) { \ 1111 while (EGET(dyn->d_tag) != DT_NULL) { \
785 if (EGET(dyn->d_tag) == DT_SONAME) { \ 1112 if (EGET(dyn->d_tag) == DT_SONAME) { \
786 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 1113 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
787 if (offset >= (Elf ## B ## _Off)elf->len) { \ 1114 if (offset >= (Elf ## B ## _Off)elf->len) { \
788 ++dyn; \ 1115 ++dyn; \
789 continue; \ 1116 continue; \
790 } \ 1117 } \
791 soname = (char*)(elf->data + offset); \ 1118 soname = elf->data + offset; \
792 *found_soname = 1; \ 1119 *found_soname = 1; \
793 return (be_wewy_wewy_quiet ? NULL : soname); \ 1120 return (be_wewy_wewy_quiet ? NULL : soname); \
794 } \ 1121 } \
795 ++dyn; \ 1122 ++dyn; \
796 } \ 1123 } \
799 SHOW_SONAME(64) 1126 SHOW_SONAME(64)
800 } 1127 }
801 1128
802 return NULL; 1129 return NULL;
803} 1130}
1131
1132/*
1133 * We support the symbol form:
1134 * [%[modifiers]%][[+-]<symbol name>][,[.....]]
1135 * If the symbol name is empty, then all symbols are matched.
1136 * If the symbol name is a glob ("*"), then all symbols are dumped (debug).
1137 * Do not rely on this output format at all.
1138 * Otherwise the symbol name is used to search (either regex or string compare).
1139 * If the first char of the symbol name is a plus ("+"), then only match
1140 * defined symbols. If it's a minus ("-"), only match undefined symbols.
1141 * Putting modifiers in between the percent signs allows for more in depth
1142 * filters. There are groups of modifiers. If you don't specify a member
1143 * of a group, then all types in that group are matched. The current
1144 * groups and their types are:
1145 * STT group: STT_NOTYPE:n STT_OBJECT:o STT_FUNC:f STT_FILE:F
1146 * STB group: STB_LOCAL:l STB_GLOBAL:g STB_WEAK:w
1147 * SHN group: SHN_UNDEF:u SHN_ABS:a SHN_COMMON:c {defined}:d
1148 * The "defined" value in the SHN group does not correspond to a SHN_xxx define.
1149 * You can search for multiple symbols at once by seperating with a comma (",").
1150 *
1151 * Some examples:
1152 * ELFs with a weak function "foo":
1153 * scanelf -s %wf%foo <ELFs>
1154 * ELFs that define the symbol "main":
1155 * scanelf -s +main <ELFs>
1156 * scanelf -s %d%main <ELFs>
1157 * ELFs that refer to the undefined symbol "brk":
1158 * scanelf -s -brk <ELFs>
1159 * scanelf -s %u%brk <ELFs>
1160 * All global defined objects in an ELF:
1161 * scanelf -s %ogd% <ELF>
1162 */
1163static void
1164scanelf_match_symname(elfobj *elf, char *found_sym, char **ret, size_t *ret_len, const char *symname,
1165 unsigned int stt, unsigned int stb, unsigned int shn, unsigned long size)
1166{
1167 char *this_sym, *next_sym, saved = saved;
1168
1169 /* allow the user to specify a comma delimited list of symbols to search for */
1170 next_sym = NULL;
1171 do {
1172 bool inc_notype, inc_object, inc_func, inc_file,
1173 inc_local, inc_global, inc_weak,
1174 inc_def, inc_undef, inc_abs, inc_common;
1175
1176 if (next_sym) {
1177 next_sym[-1] = saved;
1178 this_sym = next_sym;
1179 } else
1180 this_sym = find_sym;
1181 if ((next_sym = strchr(this_sym, ','))) {
1182 /* make parsing easier by killing the comma temporarily */
1183 saved = *next_sym;
1184 *next_sym = '\0';
1185 next_sym += 1;
1186 }
1187
1188 /* symbol selection! */
1189 inc_notype = inc_object = inc_func = inc_file = \
1190 inc_local = inc_global = inc_weak = \
1191 inc_def = inc_undef = inc_abs = inc_common = \
1192 (*this_sym != '%');
1193
1194 /* parse the contents of %...% */
1195 if (!inc_notype) {
1196 while (*(this_sym++)) {
1197 if (*this_sym == '%') {
1198 ++this_sym;
1199 break;
1200 }
1201 switch (*this_sym) {
1202 case 'n': inc_notype = true; break;
1203 case 'o': inc_object = true; break;
1204 case 'f': inc_func = true; break;
1205 case 'F': inc_file = true; break;
1206 case 'l': inc_local = true; break;
1207 case 'g': inc_global = true; break;
1208 case 'w': inc_weak = true; break;
1209 case 'd': inc_def = true; break;
1210 case 'u': inc_undef = true; break;
1211 case 'a': inc_abs = true; break;
1212 case 'c': inc_common = true; break;
1213 default: err("invalid symbol selector '%c'", *this_sym);
1214 }
1215 }
1216
1217 /* If no types are matched, not match all */
1218 if (!inc_notype && !inc_object && !inc_func && !inc_file)
1219 inc_notype = inc_object = inc_func = inc_file = true;
1220 if (!inc_local && !inc_global && !inc_weak)
1221 inc_local = inc_global = inc_weak = true;
1222 if (!inc_def && !inc_undef && !inc_abs && !inc_common)
1223 inc_def = inc_undef = inc_abs = inc_common = true;
1224
1225 /* backwards compat for defined/undefined short hand */
1226 } else if (*this_sym == '+') {
1227 inc_undef = false;
1228 ++this_sym;
1229 } else if (*this_sym == '-') {
1230 inc_def = inc_abs = inc_common = false;
1231 ++this_sym;
1232 }
1233
1234 /* filter symbols */
1235 if ((!inc_notype && stt == STT_NOTYPE) || \
1236 (!inc_object && stt == STT_OBJECT) || \
1237 (!inc_func && stt == STT_FUNC ) || \
1238 (!inc_file && stt == STT_FILE ) || \
1239 (!inc_local && stb == STB_LOCAL ) || \
1240 (!inc_global && stb == STB_GLOBAL) || \
1241 (!inc_weak && stb == STB_WEAK ) || \
1242 (!inc_def && shn && shn < SHN_LORESERVE) || \
1243 (!inc_undef && shn == SHN_UNDEF ) || \
1244 (!inc_abs && shn == SHN_ABS ) || \
1245 (!inc_common && shn == SHN_COMMON))
1246 continue;
1247
1248 if (*this_sym == '*') {
1249 /* a "*" symbol gets you debug output */
1250 printf("%s(%s) %5lX %15s %15s %15s %s\n",
1251 ((*found_sym == 0) ? "\n\t" : "\t"),
1252 elf->base_filename,
1253 size,
1254 get_elfstttype(stt),
1255 get_elfstbtype(stb),
1256 get_elfshntype(shn),
1257 symname);
1258 goto matched;
1259
1260 } else {
1261 if (g_match) {
1262 /* regex match the symbol */
1263 if (rematch(this_sym, symname, REG_EXTENDED) != 0)
1264 continue;
1265
1266 } else if (*this_sym) {
1267 /* give empty symbols a "pass", else do a normal compare */
1268 const size_t len = strlen(this_sym);
1269 if (!(strncmp(this_sym, symname, len) == 0 &&
1270 /* Accept unversioned symbol names */
1271 (symname[len] == '\0' || symname[len] == '@')))
1272 continue;
1273 }
1274
1275 if (be_semi_verbose) {
1276 char buf[1024];
1277 snprintf(buf, sizeof(buf), "%lX %s %s",
1278 size,
1279 get_elfstttype(stt),
1280 this_sym);
1281 *ret = xstrdup(buf);
1282 } else {
1283 if (*ret) xchrcat(ret, ',', ret_len);
1284 xstrcat(ret, symname, ret_len);
1285 }
1286
1287 goto matched;
1288 }
1289 } while (next_sym);
1290
1291 return;
1292
1293 matched:
1294 *found_sym = 1;
1295 if (next_sym)
1296 next_sym[-1] = saved;
1297}
1298
804static char *scanelf_file_sym(elfobj *elf, char *found_sym) 1299static const char *scanelf_file_sym(elfobj *elf, char *found_sym)
805{ 1300{
806 unsigned long i;
807 char *ret; 1301 char *ret;
808 void *symtab_void, *strtab_void; 1302 void *symtab_void, *strtab_void;
809 1303
810 if (!find_sym) return NULL; 1304 if (!find_sym) return NULL;
811 ret = find_sym; 1305 ret = NULL;
812 1306
813 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void); 1307 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
814 1308
815 if (symtab_void && strtab_void) { 1309 if (symtab_void && strtab_void) {
816#define FIND_SYM(B) \ 1310#define FIND_SYM(B) \
817 if (elf->elf_class == ELFCLASS ## B) { \ 1311 if (elf->elf_class == ELFCLASS ## B) { \
818 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 1312 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
819 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 1313 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
820 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 1314 Elf ## B ## _Sym *sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
821 unsigned long cnt = EGET(symtab->sh_entsize); \ 1315 Elf ## B ## _Word i, cnt = EGET(symtab->sh_entsize); \
822 char *symname; \ 1316 char *symname; \
1317 size_t ret_len = 0; \
823 if (cnt) \ 1318 if (cnt) \
824 cnt = EGET(symtab->sh_size) / cnt; \ 1319 cnt = EGET(symtab->sh_size) / cnt; \
825 for (i = 0; i < cnt; ++i) { \ 1320 for (i = 0; i < cnt; ++i) { \
1321 if ((void*)sym > elf->data_end) { \
1322 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1323 goto break_out; \
1324 } \
826 if (sym->st_name) { \ 1325 if (sym->st_name) { \
1326 /* make sure the symbol name is in acceptable memory range */ \
827 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 1327 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
828 if ((void*)symname > (void*)elf->data_end) { \ 1328 if ((void*)symname > elf->data_end) { \
829 warnf("%s: corrupt ELF symbols", elf->filename); \ 1329 warnf("%s: corrupt ELF symbols", elf->filename); \
1330 ++sym; \
830 continue; \ 1331 continue; \
831 } \ 1332 } \
832 if (*find_sym == '*') { \ 1333 scanelf_match_symname(elf, found_sym, \
833 printf("%s(%s) %5lX %15s %s\n", \ 1334 &ret, &ret_len, symname, \
834 ((*found_sym == 0) ? "\n\t" : "\t"), \ 1335 ELF##B##_ST_TYPE(EGET(sym->st_info)), \
835 elf->base_filename, \ 1336 ELF##B##_ST_BIND(EGET(sym->st_info)), \
836 (unsigned long)sym->st_size, \ 1337 EGET(sym->st_shndx), \
837 get_elfstttype(sym->st_info), \ 1338 /* st_size can be 64bit, but no one is really that big, so screw em */ \
838 symname); \ 1339 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 } \ 1340 } \
857 ++sym; \ 1341 ++sym; \
858 } } 1342 } \
1343 }
859 FIND_SYM(32) 1344 FIND_SYM(32)
860 FIND_SYM(64) 1345 FIND_SYM(64)
861 } 1346 }
862 1347
863break_out: 1348break_out:
866 if (*find_sym != '*' && *found_sym) 1351 if (*find_sym != '*' && *found_sym)
867 return ret; 1352 return ret;
868 if (be_quiet) 1353 if (be_quiet)
869 return NULL; 1354 return NULL;
870 else 1355 else
871 return (char *)" - "; 1356 return " - ";
872} 1357}
873 1358
1359static const char *scanelf_file_sections(elfobj *elf, char *found_section)
1360{
1361 if (!find_section)
1362 return NULL;
1363
1364#define FIND_SECTION(B) \
1365 if (elf->elf_class == ELFCLASS ## B) { \
1366 size_t matched, n; \
1367 int invert; \
1368 const char *section_name; \
1369 Elf ## B ## _Shdr *section; \
1370 \
1371 matched = 0; \
1372 array_for_each(find_section_arr, n, section_name) { \
1373 invert = (*section_name == '!' ? 1 : 0); \
1374 section = SHDR ## B (elf_findsecbyname(elf, section_name + invert)); \
1375 if ((section == NULL && invert) || (section != NULL && !invert)) \
1376 ++matched; \
1377 } \
1378 \
1379 if (matched == array_cnt(find_section_arr)) \
1380 *found_section = 1; \
1381 }
1382 FIND_SECTION(32)
1383 FIND_SECTION(64)
1384
1385 if (be_wewy_wewy_quiet)
1386 return NULL;
1387
1388 if (*found_section)
1389 return find_section;
1390
1391 if (be_quiet)
1392 return NULL;
1393 else
1394 return " - ";
1395}
874 1396
875/* scan an elf file and show all the fun stuff */ 1397/* scan an elf file and show all the fun stuff */
876#define prints(str) write(fileno(stdout), str, strlen(str)) 1398#define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
877static int scanelf_elfobj(elfobj *elf) 1399static int scanelf_elfobj(elfobj *elf)
878{ 1400{
879 unsigned long i; 1401 unsigned long i;
880 char found_pax, found_phdr, found_relro, found_load, found_textrel, 1402 char found_pax, found_phdr, found_relro, found_load, found_textrel,
881 found_rpath, found_needed, found_interp, found_bind, found_soname, 1403 found_rpath, found_needed, found_interp, found_bind, found_soname,
882 found_sym, found_lib, found_file, found_textrels; 1404 found_sym, found_lib, found_file, found_textrels, found_section;
883 static char *out_buffer = NULL; 1405 static char *out_buffer = NULL;
884 static size_t out_len; 1406 static size_t out_len;
885 1407
886 found_pax = found_phdr = found_relro = found_load = found_textrel = \ 1408 found_pax = found_phdr = found_relro = found_load = found_textrel = \
887 found_rpath = found_needed = found_interp = found_bind = found_soname = \ 1409 found_rpath = found_needed = found_interp = found_bind = found_soname = \
888 found_sym = found_lib = found_file = found_textrels = 0; 1410 found_sym = found_lib = found_file = found_textrels = found_section = 0;
889 1411
890 if (be_verbose > 2) 1412 if (be_verbose > 2)
891 printf("%s: scanning file {%s,%s}\n", elf->filename, 1413 printf("%s: scanning file {%s,%s}\n", elf->filename,
892 get_elfeitype(EI_CLASS, elf->elf_class), 1414 get_elfeitype(EI_CLASS, elf->elf_class),
893 get_elfeitype(EI_DATA, elf->data[EI_DATA])); 1415 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
895 printf("%s: scanning file\n", elf->filename); 1417 printf("%s: scanning file\n", elf->filename);
896 1418
897 /* init output buffer */ 1419 /* init output buffer */
898 if (!out_buffer) { 1420 if (!out_buffer) {
899 out_len = sizeof(char) * 80; 1421 out_len = sizeof(char) * 80;
900 out_buffer = (char*)xmalloc(out_len); 1422 out_buffer = xmalloc(out_len);
901 } 1423 }
902 *out_buffer = '\0'; 1424 *out_buffer = '\0';
903 1425
904 /* show the header */ 1426 /* show the header */
905 if (!be_quiet && show_banner) { 1427 if (!be_quiet && show_banner) {
906 for (i = 0; out_format[i]; ++i) { 1428 for (i = 0; out_format[i]; ++i) {
907 if (!IS_MODIFIER(out_format[i])) continue; 1429 if (!IS_MODIFIER(out_format[i])) continue;
908 1430
909 switch (out_format[++i]) { 1431 switch (out_format[++i]) {
1432 case '+': break;
910 case '%': break; 1433 case '%': break;
911 case '#': break; 1434 case '#': break;
912 case 'F': 1435 case 'F':
913 case 'p': 1436 case 'p':
914 case 'f': prints("FILE "); found_file = 1; break; 1437 case 'f': prints("FILE "); found_file = 1; break;
915 case 'o': prints(" TYPE "); break; 1438 case 'o': prints(" TYPE "); break;
916 case 'x': prints(" PAX "); break; 1439 case 'x': prints(" PAX "); break;
917 case 'e': prints("STK/REL/PTL "); break; 1440 case 'e': prints("STK/REL/PTL "); break;
918 case 't': prints("TEXTREL "); break; 1441 case 't': prints("TEXTREL "); break;
919 case 'r': prints("RPATH "); break; 1442 case 'r': prints("RPATH "); break;
1443 case 'M': prints("CLASS "); break;
1444 case 'l':
920 case 'n': prints("NEEDED "); break; 1445 case 'n': prints("NEEDED "); break;
921 case 'i': prints("INTERP "); break; 1446 case 'i': prints("INTERP "); break;
922 case 'b': prints("BIND "); break; 1447 case 'b': prints("BIND "); break;
1448 case 'Z': prints("SIZE "); break;
923 case 'S': prints("SONAME "); break; 1449 case 'S': prints("SONAME "); break;
924 case 's': prints("SYM "); break; 1450 case 's': prints("SYM "); break;
925 case 'N': prints("LIB "); break; 1451 case 'N': prints("LIB "); break;
926 case 'T': prints("TEXTRELS "); break; 1452 case 'T': prints("TEXTRELS "); break;
1453 case 'k': prints("SECTION "); break;
1454 case 'a': prints("ARCH "); break;
1455 case 'I': prints("OSABI "); break;
1456 case 'Y': prints("EABI "); break;
1457 case 'O': prints("PERM "); break;
1458 case 'D': prints("ENDIAN "); break;
927 default: warnf("'%c' has no title ?", out_format[i]); 1459 default: warnf("'%c' has no title ?", out_format[i]);
928 } 1460 }
929 } 1461 }
930 if (!found_file) prints("FILE "); 1462 if (!found_file) prints("FILE ");
931 prints("\n"); 1463 prints("\n");
935 1467
936 /* dump all the good stuff */ 1468 /* dump all the good stuff */
937 for (i = 0; out_format[i]; ++i) { 1469 for (i = 0; out_format[i]; ++i) {
938 const char *out; 1470 const char *out;
939 const char *tmp; 1471 const char *tmp;
940 1472 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])) { 1473 if (!IS_MODIFIER(out_format[i])) {
946 xchrcat(&out_buffer, out_format[i], &out_len); 1474 xchrcat(&out_buffer, out_format[i], &out_len);
947 continue; 1475 continue;
948 } 1476 }
949 1477
950 out = NULL; 1478 out = NULL;
951 be_wewy_wewy_quiet = (out_format[i] == '#'); 1479 be_wewy_wewy_quiet = (out_format[i] == '#');
1480 be_semi_verbose = (out_format[i] == '+');
952 switch (out_format[++i]) { 1481 switch (out_format[++i]) {
1482 case '+':
953 case '%': 1483 case '%':
954 case '#': 1484 case '#':
955 xchrcat(&out_buffer, out_format[i], &out_len); break; 1485 xchrcat(&out_buffer, out_format[i], &out_len); break;
956 case 'F': 1486 case 'F':
957 found_file = 1; 1487 found_file = 1;
983 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1513 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; 1514 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; 1515 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
986 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break; 1516 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; 1517 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1518 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1519 case 'D': out = get_endian(elf); break;
1520 case 'O': out = strfileperms(elf->filename); break;
988 case 'n': 1521 case 'n':
989 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break; 1522 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; 1523 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
991 case 'b': out = scanelf_file_bind(elf, &found_bind); break; 1524 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
992 case 'S': out = scanelf_file_soname(elf, &found_soname); break; 1525 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
993 case 's': out = scanelf_file_sym(elf, &found_sym); break; 1526 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1527 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1528 case 'a': out = get_elfemtype(elf); break;
1529 case 'I': out = get_elfosabi(elf); break;
1530 case 'Y': out = get_elf_eabi(elf); break;
1531 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]); 1532 default: warnf("'%c' has no scan code?", out_format[i]);
995 } 1533 }
996 if (out) { 1534 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); 1535 xstrcat(&out_buffer, out, &out_len);
1002 }
1003 } 1536 }
1004 1537
1005#define FOUND_SOMETHING() \ 1538#define FOUND_SOMETHING() \
1006 (found_pax || found_phdr || found_relro || found_load || found_textrel || \ 1539 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1007 found_rpath || found_needed || found_interp || found_bind || \ 1540 found_rpath || found_needed || found_interp || found_bind || \
1008 found_soname || found_sym || found_lib || found_textrels) 1541 found_soname || found_sym || found_lib || found_textrels || found_section )
1009 1542
1010 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) { 1543 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1011 xchrcat(&out_buffer, ' ', &out_len); 1544 xchrcat(&out_buffer, ' ', &out_len);
1012 xstrcat(&out_buffer, elf->filename, &out_len); 1545 xstrcat(&out_buffer, elf->filename, &out_len);
1013 } 1546 }
1020} 1553}
1021 1554
1022/* scan a single elf */ 1555/* scan a single elf */
1023static int scanelf_elf(const char *filename, int fd, size_t len) 1556static int scanelf_elf(const char *filename, int fd, size_t len)
1024{ 1557{
1025 int ret; 1558 int ret = 1;
1026 elfobj *elf; 1559 elfobj *elf;
1027 1560
1028 /* verify this is real ELF */ 1561 /* verify this is real ELF */
1029 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) { 1562 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1030 if (be_verbose > 2) printf("%s: not an ELF\n", filename); 1563 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1031 return 1; 1564 return 2;
1032 } 1565 }
1033 1566 switch (match_bits) {
1567 case 32:
1568 if (elf->elf_class != ELFCLASS32)
1569 goto label_done;
1570 break;
1571 case 64:
1572 if (elf->elf_class != ELFCLASS64)
1573 goto label_done;
1574 break;
1575 default: break;
1576 }
1034 if (strlen(match_etypes)) { 1577 if (match_etypes) {
1035 char sbuf[126]; 1578 char sbuf[126];
1036 strncpy(sbuf, match_etypes, sizeof(sbuf)); 1579 strncpy(sbuf, match_etypes, sizeof(sbuf));
1037 if (strchr(match_etypes, ',') != NULL) { 1580 if (strchr(match_etypes, ',') != NULL) {
1038 char *p; 1581 char *p;
1039 while((p = strrchr(sbuf, ',')) != NULL) { 1582 while ((p = strrchr(sbuf, ',')) != NULL) {
1040 *p = 0; 1583 *p = 0;
1041 if (atoi(p+1) == get_etype(elf)) 1584 if (etype_lookup(p+1) == get_etype(elf))
1042 goto label_ret; 1585 goto label_ret;
1043 } 1586 }
1044 } 1587 }
1045 if (atoi(sbuf) != get_etype(elf)) { 1588 if (etype_lookup(sbuf) != get_etype(elf))
1046 ret = 1;
1047 goto label_done; 1589 goto label_done;
1048 }
1049 } 1590 }
1050 1591
1051label_ret: 1592label_ret:
1052 ret = scanelf_elfobj(elf); 1593 ret = scanelf_elfobj(elf);
1053 1594
1066 1607
1067 ar = ar_open_fd(filename, fd); 1608 ar = ar_open_fd(filename, fd);
1068 if (ar == NULL) 1609 if (ar == NULL)
1069 return 1; 1610 return 1;
1070 1611
1071 ar_buffer = (char*)mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0); 1612 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) { 1613 while ((m = ar_next(ar)) != NULL) {
1614 off_t cur_pos = lseek(fd, 0, SEEK_CUR);
1615 if (cur_pos == -1)
1616 errp("lseek() failed");
1073 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size); 1617 elf = readelf_buffer(m->name, ar_buffer + cur_pos, m->size);
1074 if (elf) { 1618 if (elf) {
1075 scanelf_elfobj(elf); 1619 scanelf_elfobj(elf);
1076 unreadelf(elf); 1620 unreadelf(elf);
1077 } 1621 }
1078 } 1622 }
1079 munmap(ar_buffer, len); 1623 munmap(ar_buffer, len);
1080 1624
1081 return 0; 1625 return 0;
1082} 1626}
1083/* scan a file which may be an elf or an archive or some other magical beast */ 1627/* scan a file which may be an elf or an archive or some other magical beast */
1084static void scanelf_file(const char *filename) 1628static int scanelf_fileat(int dir_fd, const char *filename, const struct stat *st_cache)
1085{ 1629{
1630 const struct stat *st = st_cache;
1086 struct stat st; 1631 struct stat symlink_st;
1087 int fd; 1632 int fd;
1088 1633
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 */ 1634 /* always handle regular files and handle symlinked files if no -y */
1096 if (S_ISLNK(st.st_mode)) { 1635 if (S_ISLNK(st->st_mode)) {
1097 if (!scan_symlink) return; 1636 if (!scan_symlink)
1098 stat(filename, &st); 1637 return 1;
1638 fstatat(dir_fd, filename, &symlink_st, 0);
1639 st = &symlink_st;
1099 } 1640 }
1641
1100 if (!S_ISREG(st.st_mode)) { 1642 if (!S_ISREG(st->st_mode)) {
1101 if (be_verbose > 2) printf("%s: skipping non-file\n", filename); 1643 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1102 return; 1644 return 1;
1103 } 1645 }
1104 1646
1105 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1) 1647 if (match_perms) {
1648 if ((st->st_mode | match_perms) != st->st_mode)
1649 return 1;
1650 }
1651 fd = openat(dir_fd, filename, (fix_elf ? O_RDWR : O_RDONLY) | O_CLOEXEC);
1652 if (fd == -1)
1106 return; 1653 return 1;
1107 1654
1108 if (scanelf_elf(filename, fd, st.st_size) == 1 && scan_archives) 1655 if (scanelf_elf(filename, fd, st->st_size) == 2) {
1109 /* if it isn't an ELF, maybe it's an .a archive */ 1656 /* if it isn't an ELF, maybe it's an .a archive */
1657 if (scan_archives)
1110 scanelf_archive(filename, fd, st.st_size); 1658 scanelf_archive(filename, fd, st->st_size);
1111 1659
1660 /*
1661 * unreadelf() implicitly closes its fd, so only close it
1662 * when we are returning it in the non-ELF case
1663 */
1112 close(fd); 1664 close(fd);
1665 }
1666
1667 return 0;
1113} 1668}
1114 1669
1115/* scan a directory for ET_EXEC files and print when we find one */ 1670/* scan a directory for ET_EXEC files and print when we find one */
1116static void scanelf_dir(const char *path) 1671static int scanelf_dirat(int dir_fd, const char *path)
1117{ 1672{
1118 register DIR *dir; 1673 register DIR *dir;
1119 register struct dirent *dentry; 1674 register struct dirent *dentry;
1120 struct stat st_top, st; 1675 struct stat st_top, st;
1121 char buf[__PAX_UTILS_PATH_MAX]; 1676 char buf[__PAX_UTILS_PATH_MAX], *subpath;
1122 size_t pathlen = 0, len = 0; 1677 size_t pathlen = 0, len = 0;
1678 int ret = 0;
1679 int subdir_fd;
1123 1680
1124 /* make sure path exists */ 1681 /* make sure path exists */
1125 if (lstat(path, &st_top) == -1) { 1682 if (fstatat(dir_fd, path, &st_top, AT_SYMLINK_NOFOLLOW) == -1) {
1126 if (be_verbose > 2) printf("%s: does not exist\n", path); 1683 if (be_verbose > 2) printf("%s: does not exist\n", path);
1127 return; 1684 return 1;
1128 } 1685 }
1129 1686
1130 /* ok, if it isn't a directory, assume we can open it */ 1687 /* ok, if it isn't a directory, assume we can open it */
1131 if (!S_ISDIR(st_top.st_mode)) { 1688 if (!S_ISDIR(st_top.st_mode))
1132 scanelf_file(path); 1689 return scanelf_fileat(dir_fd, path, &st_top);
1133 return;
1134 }
1135 1690
1136 /* now scan the dir looking for fun stuff */ 1691 /* now scan the dir looking for fun stuff */
1137 if ((dir = opendir(path)) == NULL) { 1692 subdir_fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
1138 warnf("could not opendir %s: %s", path, strerror(errno)); 1693 if (subdir_fd == -1)
1694 dir = NULL;
1695 else
1696 dir = fdopendir(subdir_fd);
1697 if (dir == NULL) {
1698 if (subdir_fd != -1)
1699 close(subdir_fd);
1700 warnfp("could not opendir(%s)", path);
1139 return; 1701 return 1;
1140 } 1702 }
1141 if (be_verbose > 1) printf("%s: scanning dir\n", path); 1703 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1142 1704
1143 pathlen = strlen(path); 1705 subpath = stpcpy(buf, path);
1706 *subpath++ = '/';
1707 pathlen = subpath - buf;
1144 while ((dentry = readdir(dir))) { 1708 while ((dentry = readdir(dir))) {
1145 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1709 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1146 continue; 1710 continue;
1147 len = (pathlen + 1 + strlen(dentry->d_name) + 1); 1711
1148 if (len >= sizeof(buf)) { 1712 if (fstatat(subdir_fd, dentry->d_name, &st, AT_SYMLINK_NOFOLLOW) == -1)
1149 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1150 (unsigned long)len, (unsigned long)sizeof(buf));
1151 continue; 1713 continue;
1714
1715 len = strlen(dentry->d_name);
1716 if (len + pathlen + 1 >= sizeof(buf)) {
1717 warnf("Skipping '%s%s': len > sizeof(buf); %zu > %zu\n",
1718 path, dentry->d_name, len + pathlen + 1, sizeof(buf));
1719 continue;
1152 } 1720 }
1153 sprintf(buf, "%s/%s", path, dentry->d_name); 1721 memcpy(subpath, dentry->d_name, len);
1154 if (lstat(buf, &st) != -1) { 1722 subpath[len] = '\0';
1723
1155 if (S_ISREG(st.st_mode)) 1724 if (S_ISREG(st.st_mode))
1156 scanelf_file(buf); 1725 ret = scanelf_fileat(dir_fd, buf, &st);
1157 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1726 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1158 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1727 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1159 scanelf_dir(buf); 1728 ret = scanelf_dirat(dir_fd, buf);
1160 }
1161 } 1729 }
1162 } 1730 }
1163 closedir(dir); 1731 closedir(dir);
1164}
1165 1732
1733 return ret;
1734}
1735static int scanelf_dir(const char *path)
1736{
1737 return scanelf_dirat(root_fd, root_rel_path(path));
1738}
1739
1166static int scanelf_from_file(char *filename) 1740static int scanelf_from_file(const char *filename)
1167{ 1741{
1168 FILE *fp = NULL; 1742 FILE *fp;
1169 char *p; 1743 char *p, *path;
1170 char path[__PAX_UTILS_PATH_MAX]; 1744 size_t len;
1745 int ret;
1171 1746
1172 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL)) 1747 if (strcmp(filename, "-") == 0)
1173 fp = stdin; 1748 fp = stdin;
1174 else if ((fp = fopen(filename, "r")) == NULL) 1749 else if ((fp = fopen(filename, "r")) == NULL)
1175 return 1; 1750 return 1;
1176 1751
1177 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) { 1752 path = NULL;
1753 len = 0;
1754 ret = 0;
1755 while (getline(&path, &len, fp) != -1) {
1178 if ((p = strchr(path, '\n')) != NULL) 1756 if ((p = strchr(path, '\n')) != NULL)
1179 *p = 0; 1757 *p = 0;
1180 search_path = path; 1758 search_path = path;
1181 scanelf_dir(path); 1759 ret = scanelf_dir(path);
1182 } 1760 }
1761 free(path);
1762
1183 if (fp != stdin) 1763 if (fp != stdin)
1184 fclose(fp); 1764 fclose(fp);
1765
1185 return 0; 1766 return ret;
1186} 1767}
1187 1768
1188static void load_ld_so_conf() 1769#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1770
1771static int _load_ld_cache_config(const char *fname)
1189{ 1772{
1190 FILE *fp = NULL; 1773 FILE *fp = NULL;
1191 char *p; 1774 char *p, *path;
1192 char path[__PAX_UTILS_PATH_MAX]; 1775 size_t len;
1193 int i = 0; 1776 int curr_fd = -1;
1194 1777
1195 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1778 fp = fopenat_r(root_fd, root_rel_path(fname));
1779 if (fp == NULL)
1196 return; 1780 return -1;
1197 1781
1198 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) { 1782 path = NULL;
1199 if (*path != '/') 1783 len = 0;
1200 continue; 1784 while (getline(&path, &len, fp) != -1) {
1201
1202 if ((p = strrchr(path, '\r')) != NULL) 1785 if ((p = strrchr(path, '\r')) != NULL)
1203 *p = 0; 1786 *p = 0;
1204 if ((p = strchr(path, '\n')) != NULL) 1787 if ((p = strchr(path, '\n')) != NULL)
1205 *p = 0; 1788 *p = 0;
1206 1789
1207 ldpaths[i++] = xstrdup(path); 1790 /* recursive includes of the same file will make this segfault. */
1791 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1792 glob_t gl;
1793 size_t x;
1794 const char *gpath;
1208 1795
1209 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths)) 1796 /* re-use existing path buffer ... need to be creative */
1210 break; 1797 if (path[8] != '/')
1798 gpath = memcpy(path + 3, "/etc/", 5);
1799 else
1800 gpath = path + 8;
1801 if (root_fd != AT_FDCWD) {
1802 if (curr_fd == -1) {
1803 curr_fd = open(".", O_RDONLY|O_CLOEXEC);
1804 if (fchdir(root_fd))
1805 errp("unable to change to root dir");
1806 }
1807 gpath = root_rel_path(gpath);
1808 }
1809
1810 if (glob(gpath, 0, NULL, &gl) == 0) {
1811 for (x = 0; x < gl.gl_pathc; ++x) {
1812 /* try to avoid direct loops */
1813 if (strcmp(gl.gl_pathv[x], fname) == 0)
1814 continue;
1815 _load_ld_cache_config(gl.gl_pathv[x]);
1816 }
1817 globfree(&gl);
1818 }
1819
1820 /* failed globs are ignored by glibc */
1821 continue;
1211 } 1822 }
1212 ldpaths[i] = NULL; 1823
1824 if (*path != '/')
1825 continue;
1826
1827 xarraypush_str(ldpaths, path);
1828 }
1829 free(path);
1213 1830
1214 fclose(fp); 1831 fclose(fp);
1832
1833 if (curr_fd != -1) {
1834 if (fchdir(curr_fd))
1835 /* don't care */;
1836 close(curr_fd);
1837 }
1838
1839 return 0;
1840}
1841
1842#elif defined(__FreeBSD__) || defined(__DragonFly__)
1843
1844static int _load_ld_cache_config(const char *fname)
1845{
1846 FILE *fp = NULL;
1847 char *b = NULL, *p;
1848 struct elfhints_hdr hdr;
1849
1850 fp = fopenat_r(root_fd, root_rel_path(fname));
1851 if (fp == NULL)
1852 return -1;
1853
1854 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1855 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1856 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1857 {
1858 fclose(fp);
1859 return -1;
1860 }
1861
1862 b = xmalloc(hdr.dirlistlen + 1);
1863 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1864 fclose(fp);
1865 free(b);
1866 return -1;
1867 }
1868
1869 while ((p = strsep(&b, ":"))) {
1870 if (*p == '\0')
1871 continue;
1872 xarraypush_str(ldpaths, p);
1873 }
1874
1875 free(b);
1876 fclose(fp);
1877 return 0;
1878}
1879
1880#else
1881#ifdef __ELF__
1882#warning Cache config support not implemented for your target
1883#endif
1884static int _load_ld_cache_config(const char *fname)
1885{
1886 return 0;
1887}
1888#endif
1889
1890static void load_ld_cache_config(const char *fname)
1891{
1892 bool scan_l, scan_ul, scan_ull;
1893 size_t n;
1894 const char *ldpath;
1895
1896 _load_ld_cache_config(fname);
1897
1898 scan_l = scan_ul = scan_ull = false;
1899 if (array_cnt(ldpaths)) {
1900 array_for_each(ldpaths, n, ldpath) {
1901 if (!scan_l && !strcmp(ldpath, "/lib")) scan_l = true;
1902 if (!scan_ul && !strcmp(ldpath, "/usr/lib")) scan_ul = true;
1903 if (!scan_ull && !strcmp(ldpath, "/usr/local/lib")) scan_ull = true;
1904 }
1905 }
1906
1907 if (!scan_l) xarraypush_str(ldpaths, "/lib");
1908 if (!scan_ul) xarraypush_str(ldpaths, "/usr/lib");
1909 if (!scan_ull) xarraypush_str(ldpaths, "/usr/local/lib");
1215} 1910}
1216 1911
1217/* scan /etc/ld.so.conf for paths */ 1912/* scan /etc/ld.so.conf for paths */
1218static void scanelf_ldpath() 1913static void scanelf_ldpath(void)
1219{ 1914{
1220 char scan_l, scan_ul, scan_ull; 1915 size_t n;
1221 int i = 0; 1916 const char *ldpath;
1222 1917
1223 if (!ldpaths[0]) 1918 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]); 1919 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} 1920}
1240 1921
1241/* scan env PATH for paths */ 1922/* scan env PATH for paths */
1242static void scanelf_envpath() 1923static void scanelf_envpath(void)
1243{ 1924{
1244 char *path, *p; 1925 char *path, *p;
1245 1926
1246 path = getenv("PATH"); 1927 path = getenv("PATH");
1247 if (!path) 1928 if (!path)
1254 } 1935 }
1255 1936
1256 free(path); 1937 free(path);
1257} 1938}
1258 1939
1259 1940/* 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" 1941#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZCBhV"
1262#define a_argument required_argument 1942#define a_argument required_argument
1263static struct option const long_opts[] = { 1943static struct option const long_opts[] = {
1264 {"path", no_argument, NULL, 'p'}, 1944 {"path", no_argument, NULL, 'p'},
1265 {"ldpath", no_argument, NULL, 'l'}, 1945 {"ldpath", no_argument, NULL, 'l'},
1946 {"use-ldpath",no_argument, NULL, 129},
1947 {"root", a_argument, NULL, 128},
1266 {"recursive", no_argument, NULL, 'R'}, 1948 {"recursive", no_argument, NULL, 'R'},
1267 {"mount", no_argument, NULL, 'm'}, 1949 {"mount", no_argument, NULL, 'm'},
1268 {"symlink", no_argument, NULL, 'y'}, 1950 {"symlink", no_argument, NULL, 'y'},
1269 {"archives", no_argument, NULL, 'A'}, 1951 {"archives", no_argument, NULL, 'A'},
1270 {"ldcache", no_argument, NULL, 'L'}, 1952 {"ldcache", no_argument, NULL, 'L'},
1271 {"fix", no_argument, NULL, 'X'}, 1953 {"fix", no_argument, NULL, 'X'},
1954 {"setpax", a_argument, NULL, 'z'},
1272 {"pax", no_argument, NULL, 'x'}, 1955 {"pax", no_argument, NULL, 'x'},
1273 {"header", no_argument, NULL, 'e'}, 1956 {"header", no_argument, NULL, 'e'},
1274 {"textrel", no_argument, NULL, 't'}, 1957 {"textrel", no_argument, NULL, 't'},
1275 {"rpath", no_argument, NULL, 'r'}, 1958 {"rpath", no_argument, NULL, 'r'},
1276 {"needed", no_argument, NULL, 'n'}, 1959 {"needed", no_argument, NULL, 'n'},
1277 {"interp", no_argument, NULL, 'i'}, 1960 {"interp", no_argument, NULL, 'i'},
1278 {"bind", no_argument, NULL, 'b'}, 1961 {"bind", no_argument, NULL, 'b'},
1279 {"soname", no_argument, NULL, 'S'}, 1962 {"soname", no_argument, NULL, 'S'},
1280 {"symbol", a_argument, NULL, 's'}, 1963 {"symbol", a_argument, NULL, 's'},
1964 {"section", a_argument, NULL, 'k'},
1281 {"lib", a_argument, NULL, 'N'}, 1965 {"lib", a_argument, NULL, 'N'},
1282 {"gmatch", no_argument, NULL, 'g'}, 1966 {"gmatch", no_argument, NULL, 'g'},
1283 {"textrels", no_argument, NULL, 'T'}, 1967 {"textrels", no_argument, NULL, 'T'},
1284 {"etype", a_argument, NULL, 'E'}, 1968 {"etype", a_argument, NULL, 'E'},
1969 {"bits", a_argument, NULL, 'M'},
1970 {"endian", no_argument, NULL, 'D'},
1971 {"osabi", no_argument, NULL, 'I'},
1972 {"eabi", no_argument, NULL, 'Y'},
1973 {"perms", a_argument, NULL, 'O'},
1974 {"size", no_argument, NULL, 'Z'},
1285 {"all", no_argument, NULL, 'a'}, 1975 {"all", no_argument, NULL, 'a'},
1286 {"quiet", no_argument, NULL, 'q'}, 1976 {"quiet", no_argument, NULL, 'q'},
1287 {"verbose", no_argument, NULL, 'v'}, 1977 {"verbose", no_argument, NULL, 'v'},
1288 {"format", a_argument, NULL, 'F'}, 1978 {"format", a_argument, NULL, 'F'},
1289 {"from", a_argument, NULL, 'f'}, 1979 {"from", a_argument, NULL, 'f'},
1290 {"file", a_argument, NULL, 'o'}, 1980 {"file", a_argument, NULL, 'o'},
1981 {"nocolor", no_argument, NULL, 'C'},
1291 {"nobanner", no_argument, NULL, 'B'}, 1982 {"nobanner", no_argument, NULL, 'B'},
1292 {"help", no_argument, NULL, 'h'}, 1983 {"help", no_argument, NULL, 'h'},
1293 {"version", no_argument, NULL, 'V'}, 1984 {"version", no_argument, NULL, 'V'},
1294 {NULL, no_argument, NULL, 0x0} 1985 {NULL, no_argument, NULL, 0x0}
1295}; 1986};
1296 1987
1297static const char *opts_help[] = { 1988static const char * const opts_help[] = {
1298 "Scan all directories in PATH environment", 1989 "Scan all directories in PATH environment",
1299 "Scan all directories in /etc/ld.so.conf", 1990 "Scan all directories in /etc/ld.so.conf",
1991 "Use ld.so.conf to show full path (use with -r/-n)",
1992 "Root directory (use with -l or -p)",
1300 "Scan directories recursively", 1993 "Scan directories recursively",
1301 "Don't recursively cross mount points", 1994 "Don't recursively cross mount points",
1302 "Don't scan symlinks", 1995 "Don't scan symlinks",
1303 "Scan archives (.a files)", 1996 "Scan archives (.a files)",
1304 "Utilize ld.so.cache information (use with -r/-n)", 1997 "Utilize ld.so.cache to show full path (use with -r/-n)",
1305 "Try and 'fix' bad things (use with -r/-e)\n", 1998 "Try and 'fix' bad things (use with -r/-e)",
1999 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1306 "Print PaX markings", 2000 "Print PaX markings",
1307 "Print GNU_STACK/PT_LOAD markings", 2001 "Print GNU_STACK/PT_LOAD markings",
1308 "Print TEXTREL information", 2002 "Print TEXTREL information",
1309 "Print RPATH information", 2003 "Print RPATH information",
1310 "Print NEEDED information", 2004 "Print NEEDED information",
1311 "Print INTERP information", 2005 "Print INTERP information",
1312 "Print BIND information", 2006 "Print BIND information",
1313 "Print SONAME information", 2007 "Print SONAME information",
1314 "Find a specified symbol", 2008 "Find a specified symbol",
2009 "Find a specified section",
1315 "Find a specified library", 2010 "Find a specified library",
1316 "Use strncmp to match libraries. (use with -N)", 2011 "Use regex matching rather than string compare (use with -s)",
1317 "Locate cause of TEXTREL", 2012 "Locate cause of TEXTREL",
2013 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1318 "Print only ELF files matching numeric constant", 2014 "Print only ELF files matching numeric bits",
1319 "Print all scanned info (-x -e -t -r -b)\n", 2015 "Print Endianness",
2016 "Print OSABI",
2017 "Print EABI (EM_ARM Only)",
2018 "Print only ELF files matching octal permissions",
2019 "Print ELF file size",
2020 "Print all useful/simple info\n",
1320 "Only output 'bad' things", 2021 "Only output 'bad' things",
1321 "Be verbose (can be specified more than once)", 2022 "Be verbose (can be specified more than once)",
1322 "Use specified format for output", 2023 "Use specified format for output",
1323 "Read input stream from a filename", 2024 "Read input stream from a filename",
1324 "Write output stream to a filename", 2025 "Write output stream to a filename",
2026 "Don't emit color in output",
1325 "Don't display the header", 2027 "Don't display the header",
1326 "Print this help and exit", 2028 "Print this help and exit",
1327 "Print version and exit", 2029 "Print version and exit",
1328 NULL 2030 NULL
1329}; 2031};
1335 printf("* Scan ELF binaries for stuff\n\n" 2037 printf("* Scan ELF binaries for stuff\n\n"
1336 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0); 2038 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1337 printf("Options: -[%s]\n", PARSE_FLAGS); 2039 printf("Options: -[%s]\n", PARSE_FLAGS);
1338 for (i = 0; long_opts[i].name; ++i) 2040 for (i = 0; long_opts[i].name; ++i)
1339 if (long_opts[i].has_arg == no_argument) 2041 if (long_opts[i].has_arg == no_argument)
1340 printf(" -%c, --%-13s* %s\n", long_opts[i].val, 2042 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
2043 long_opts[i].name, opts_help[i]);
2044 else if (long_opts[i].val > '~')
2045 printf(" --%-7s <arg> * %s\n",
1341 long_opts[i].name, opts_help[i]); 2046 long_opts[i].name, opts_help[i]);
1342 else 2047 else
1343 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val, 2048 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
1344 long_opts[i].name, opts_help[i]); 2049 long_opts[i].name, opts_help[i]);
1345 2050
1346 if (status != EXIT_SUCCESS) 2051 puts("\nFor more information, see the scanelf(1) manpage");
1347 exit(status);
1348
1349 puts("\nThe format modifiers for the -F option are:");
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); 2052 exit(status);
1360} 2053}
1361 2054
1362/* parse command line arguments and preform needed actions */ 2055/* parse command line arguments and preform needed actions */
2056#define do_pax_state(option, flag) \
2057 if (islower(option)) { \
2058 flags &= ~PF_##flag; \
2059 flags |= PF_NO##flag; \
2060 } else { \
2061 flags &= ~PF_NO##flag; \
2062 flags |= PF_##flag; \
2063 }
1363static void parseargs(int argc, char *argv[]) 2064static int parseargs(int argc, char *argv[])
1364{ 2065{
1365 int i; 2066 int i;
1366 char *from_file = NULL; 2067 const char *from_file = NULL;
2068 int ret = 0;
2069 char load_cache_config = 0;
1367 2070
1368 opterr = 0; 2071 opterr = 0;
1369 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 2072 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1370 switch (i) { 2073 switch (i) {
1371 2074
1379 case 'f': 2082 case 'f':
1380 if (from_file) warn("You prob don't want to specify -f twice"); 2083 if (from_file) warn("You prob don't want to specify -f twice");
1381 from_file = optarg; 2084 from_file = optarg;
1382 break; 2085 break;
1383 case 'E': 2086 case 'E':
1384 strncpy(match_etypes, optarg, sizeof(match_etypes)); 2087 match_etypes = optarg;
2088 break;
2089 case 'M':
2090 match_bits = atoi(optarg);
2091 if (match_bits == 0) {
2092 if (strcmp(optarg, "ELFCLASS32") == 0)
2093 match_bits = 32;
2094 if (strcmp(optarg, "ELFCLASS64") == 0)
2095 match_bits = 64;
2096 }
2097 break;
2098 case 'O':
2099 if (sscanf(optarg, "%o", &match_perms) == -1)
2100 match_bits = 0;
1385 break; 2101 break;
1386 case 'o': { 2102 case 'o': {
1387 FILE *fp = NULL;
1388 if ((fp = freopen(optarg, "w", stdout)) == NULL) 2103 if (freopen(optarg, "w", stdout) == NULL)
1389 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 2104 errp("Could not freopen(%s)", optarg);
1390 SET_STDOUT(fp);
1391 break; 2105 break;
1392 } 2106 }
1393 2107 case 'k':
2108 xarraypush_str(find_section_arr, optarg);
2109 break;
1394 case 's': { 2110 case 's': {
1395 if (find_sym) warn("You prob don't want to specify -s twice"); 2111 if (find_sym) warn("You prob don't want to specify -s twice");
1396 find_sym = optarg; 2112 find_sym = optarg;
1397 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1398 sprintf(versioned_symname, "%s@", find_sym);
1399 break; 2113 break;
1400 } 2114 }
1401 case 'N': { 2115 case 'N':
1402 if (find_lib) warn("You prob don't want to specify -N twice"); 2116 xarraypush_str(find_lib_arr, optarg);
1403 find_lib = optarg;
1404 break; 2117 break;
1405 }
1406
1407 case 'F': { 2118 case 'F': {
1408 if (out_format) warn("You prob don't want to specify -F twice"); 2119 if (out_format) warn("You prob don't want to specify -F twice");
1409 out_format = optarg; 2120 out_format = optarg;
1410 break; 2121 break;
1411 } 2122 }
2123 case 'z': {
2124 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
2125 size_t x;
1412 2126
1413 case 'g': gmatch = 1; /* break; any reason we dont breal; here ? */ 2127 for (x = 0; x < strlen(optarg); x++) {
2128 switch (optarg[x]) {
2129 case 'p':
2130 case 'P':
2131 do_pax_state(optarg[x], PAGEEXEC);
2132 break;
2133 case 's':
2134 case 'S':
2135 do_pax_state(optarg[x], SEGMEXEC);
2136 break;
2137 case 'm':
2138 case 'M':
2139 do_pax_state(optarg[x], MPROTECT);
2140 break;
2141 case 'e':
2142 case 'E':
2143 do_pax_state(optarg[x], EMUTRAMP);
2144 break;
2145 case 'r':
2146 case 'R':
2147 do_pax_state(optarg[x], RANDMMAP);
2148 break;
2149 case 'x':
2150 case 'X':
2151 do_pax_state(optarg[x], RANDEXEC);
2152 break;
2153 default:
2154 break;
2155 }
2156 }
2157 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
2158 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
2159 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
2160 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
2161 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
2162 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
2163 setpax = flags;
2164 break;
2165 }
2166 case 'Z': show_size = 1; break;
1414 case 'L': use_ldcache = 1; break; 2167 case 'g': g_match = 1; break;
2168 case 'L': load_cache_config = use_ldcache = 1; break;
1415 case 'y': scan_symlink = 0; break; 2169 case 'y': scan_symlink = 0; break;
1416 case 'A': scan_archives = 1; break; 2170 case 'A': scan_archives = 1; break;
2171 case 'C': color_init(true); break;
1417 case 'B': show_banner = 0; break; 2172 case 'B': show_banner = 0; break;
1418 case 'l': scan_ldpath = 1; break; 2173 case 'l': load_cache_config = scan_ldpath = 1; break;
1419 case 'p': scan_envpath = 1; break; 2174 case 'p': scan_envpath = 1; break;
1420 case 'R': dir_recurse = 1; break; 2175 case 'R': dir_recurse = 1; break;
1421 case 'm': dir_crossmount = 0; break; 2176 case 'm': dir_crossmount = 0; break;
1422 case 'X': ++fix_elf; break; 2177 case 'X': ++fix_elf; break;
1423 case 'x': show_pax = 1; break; 2178 case 'x': show_pax = 1; break;
1429 case 'b': show_bind = 1; break; 2184 case 'b': show_bind = 1; break;
1430 case 'S': show_soname = 1; break; 2185 case 'S': show_soname = 1; break;
1431 case 'T': show_textrels = 1; break; 2186 case 'T': show_textrels = 1; break;
1432 case 'q': be_quiet = 1; break; 2187 case 'q': be_quiet = 1; break;
1433 case 'v': be_verbose = (be_verbose % 20) + 1; break; 2188 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1434 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break; 2189 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
1435 2190 case 'D': show_endian = 1; break;
2191 case 'I': show_osabi = 1; break;
2192 case 'Y': show_eabi = 1; break;
2193 case 128:
2194 root_fd = open(optarg, O_RDONLY|O_CLOEXEC);
2195 if (root_fd == -1)
2196 err("Could not open root: %s", optarg);
2197 break;
2198 case 129: load_cache_config = use_ldpath = 1; break;
1436 case ':': 2199 case ':':
1437 err("Option '%c' is missing parameter", optopt); 2200 err("Option '%c' is missing parameter", optopt);
1438 case '?': 2201 case '?':
1439 err("Unknown option '%c' or argument missing", optopt); 2202 err("Unknown option '%c' or argument missing", optopt);
1440 default: 2203 default:
1441 err("Unhandled option '%c'; please report this", i); 2204 err("Unhandled option '%c'; please report this", i);
1442 } 2205 }
1443 } 2206 }
1444 2207 if (show_textrels && be_verbose)
2208 has_objdump = bin_in_path("objdump");
2209 /* flatten arrays for display */
2210 if (array_cnt(find_lib_arr))
2211 find_lib = array_flatten_str(find_lib_arr);
2212 if (array_cnt(find_section_arr))
2213 find_section = array_flatten_str(find_section_arr);
1445 /* let the format option override all other options */ 2214 /* let the format option override all other options */
1446 if (out_format) { 2215 if (out_format) {
1447 show_pax = show_phdr = show_textrel = show_rpath = \ 2216 show_pax = show_phdr = show_textrel = show_rpath = \
1448 show_needed = show_interp = show_bind = show_soname = \ 2217 show_needed = show_interp = show_bind = show_soname = \
1449 show_textrels = 0; 2218 show_textrels = show_perms = show_endian = show_size = \
2219 show_osabi = show_eabi = 0;
1450 for (i = 0; out_format[i]; ++i) { 2220 for (i = 0; out_format[i]; ++i) {
1451 if (!IS_MODIFIER(out_format[i])) continue; 2221 if (!IS_MODIFIER(out_format[i])) continue;
1452 2222
1453 switch (out_format[++i]) { 2223 switch (out_format[++i]) {
2224 case '+': break;
1454 case '%': break; 2225 case '%': break;
1455 case '#': break; 2226 case '#': break;
1456 case 'F': break; 2227 case 'F': break;
1457 case 'p': break; 2228 case 'p': break;
1458 case 'f': break; 2229 case 'f': break;
2230 case 'k': break;
1459 case 's': break; 2231 case 's': break;
1460 case 'N': break; 2232 case 'N': break;
1461 case 'o': break; 2233 case 'o': break;
2234 case 'a': break;
2235 case 'M': break;
2236 case 'Z': show_size = 1; break;
2237 case 'D': show_endian = 1; break;
2238 case 'I': show_osabi = 1; break;
2239 case 'Y': show_eabi = 1; break;
2240 case 'O': show_perms = 1; break;
1462 case 'x': show_pax = 1; break; 2241 case 'x': show_pax = 1; break;
1463 case 'e': show_phdr = 1; break; 2242 case 'e': show_phdr = 1; break;
1464 case 't': show_textrel = 1; break; 2243 case 't': show_textrel = 1; break;
1465 case 'r': show_rpath = 1; break; 2244 case 'r': show_rpath = 1; break;
1466 case 'n': show_needed = 1; break; 2245 case 'n': show_needed = 1; break;
1467 case 'i': show_interp = 1; break; 2246 case 'i': show_interp = 1; break;
1468 case 'b': show_bind = 1; break; 2247 case 'b': show_bind = 1; break;
1469 case 'S': show_soname = 1; break; 2248 case 'S': show_soname = 1; break;
1470 case 'T': show_textrels = 1; break; 2249 case 'T': show_textrels = 1; break;
1471 default: 2250 default:
1472 err("Invalid format specifier '%c' (byte %i)", 2251 err("invalid format specifier '%c' (byte %i)",
1473 out_format[i], i+1); 2252 out_format[i], i+1);
1474 } 2253 }
1475 } 2254 }
1476 2255
1477 /* construct our default format */ 2256 /* construct our default format */
1478 } else { 2257 } else {
1479 size_t fmt_len = 30; 2258 size_t fmt_len = 30;
1480 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 2259 out_format = xmalloc(sizeof(char) * fmt_len);
2260 *out_format = '\0';
1481 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 2261 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1482 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len); 2262 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
2263 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
2264 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
2265 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
2266 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
2267 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
1483 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len); 2268 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1484 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 2269 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1485 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 2270 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1486 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 2271 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1487 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 2272 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1488 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len); 2273 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1489 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len); 2274 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1490 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len); 2275 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1491 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len); 2276 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
2277 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1492 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len); 2278 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1493 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 2279 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1494 } 2280 }
1495 if (be_verbose > 2) printf("Format: %s\n", out_format); 2281 if (be_verbose > 2) printf("Format: %s\n", out_format);
1496 2282
1497 /* now lets actually do the scanning */ 2283 /* now lets actually do the scanning */
1498 if (scan_ldpath || use_ldcache) 2284 if (load_cache_config)
1499 load_ld_so_conf(); 2285 load_ld_cache_config(__PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
1500 if (scan_ldpath) scanelf_ldpath(); 2286 if (scan_ldpath) scanelf_ldpath();
1501 if (scan_envpath) scanelf_envpath(); 2287 if (scan_envpath) scanelf_envpath();
2288 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
2289 from_file = "-";
1502 if (from_file) { 2290 if (from_file) {
1503 scanelf_from_file(from_file); 2291 scanelf_from_file(from_file);
1504 from_file = *argv; 2292 from_file = *argv;
1505 } 2293 }
1506 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file) 2294 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1507 err("Nothing to scan !?"); 2295 err("Nothing to scan !?");
1508 while (optind < argc) { 2296 while (optind < argc) {
1509 search_path = argv[optind++]; 2297 search_path = argv[optind++];
1510 scanelf_dir(search_path); 2298 ret = scanelf_dir(search_path);
1511 } 2299 }
1512 2300
1513 /* clean up */ 2301 /* clean up */
1514 if (versioned_symname) free(versioned_symname);
1515 for (i = 0; ldpaths[i]; ++i)
1516 free(ldpaths[i]); 2302 xarrayfree(ldpaths);
2303 xarrayfree(find_lib_arr);
2304 xarrayfree(find_section_arr);
2305 free(find_lib);
2306 free(find_section);
1517 2307
1518 if (ldcache != 0) 2308 if (ldcache != 0)
1519 munmap(ldcache, ldcache_size); 2309 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; 2310 return ret;
1530} 2311}
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 2312
1541 new_len = strlen(*dst) + strlen(src); 2313static 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{ 2314{
1556 static char my_app[2]; 2315 const char *delims = " \t\n";
1557 my_app[0] = append; 2316 char **envvals = NULL;
1558 my_app[1] = '\0'; 2317 char *env, *s;
1559 xstrcat(dst, my_app, curr_len); 2318 int nentry;
1560}
1561 2319
2320 if ((env = getenv(envvar)) == NULL)
2321 return NULL;
1562 2322
2323 env = xstrdup(env);
2324 if (env == NULL)
2325 return NULL;
2326
2327 s = strtok(env, delims);
2328 if (s == NULL) {
2329 free(env);
2330 return NULL;
2331 }
2332
2333 nentry = 0;
2334 while (s != NULL) {
2335 ++nentry;
2336 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
2337 envvals[nentry-1] = s;
2338 s = strtok(NULL, delims);
2339 }
2340 envvals[nentry] = NULL;
2341
2342 /* don't want to free(env) as it contains the memory that backs
2343 * the envvals array of strings */
2344 return envvals;
2345}
2346
2347static void parseenv(void)
2348{
2349 color_init(false);
2350 qa_textrels = get_split_env("QA_TEXTRELS");
2351 qa_execstack = get_split_env("QA_EXECSTACK");
2352 qa_wx_load = get_split_env("QA_WX_LOAD");
2353}
2354
2355#ifdef __PAX_UTILS_CLEANUP
2356static void cleanup(void)
2357{
2358 free(out_format);
2359 free(qa_textrels);
2360 free(qa_execstack);
2361 free(qa_wx_load);
2362}
2363#endif
1563 2364
1564int main(int argc, char *argv[]) 2365int main(int argc, char *argv[])
1565{ 2366{
2367 int ret;
1566 if (argc < 2) 2368 if (argc < 2)
1567 usage(EXIT_FAILURE); 2369 usage(EXIT_FAILURE);
2370 parseenv();
1568 parseargs(argc, argv); 2371 ret = parseargs(argc, argv);
1569 fclose(stdout); 2372 fclose(stdout);
1570#ifdef __BOUNDS_CHECKING_ON 2373#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()"); 2374 cleanup();
2375 warn("The calls to add/delete heap should be off:\n"
2376 "\t- 1 due to the out_buffer not being freed in scanelf_fileat()\n"
2377 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
1572#endif 2378#endif
1573 return EXIT_SUCCESS; 2379 return ret;
1574} 2380}
2381
2382/* Match filename against entries in matchlist, return TRUE
2383 * if the file is listed */
2384static int file_matches_list(const char *filename, char **matchlist)
2385{
2386 char **file;
2387 char *match;
2388 char buf[__PAX_UTILS_PATH_MAX];
2389
2390 if (matchlist == NULL)
2391 return 0;
2392
2393 for (file = matchlist; *file != NULL; file++) {
2394 if (search_path) {
2395 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2396 match = buf;
2397 } else {
2398 match = *file;
2399 }
2400 if (fnmatch(match, filename, 0) == 0)
2401 return 1;
2402 }
2403 return 0;
2404}

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