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

Diff of /pax-utils/scanelf.c

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

Revision 1.127 Revision 1.243
1/* 1/*
2 * Copyright 2003-2006 Gentoo Foundation 2 * Copyright 2003-2007 Gentoo Foundation
3 * Distributed under the terms of the GNU General Public License v2 3 * Distributed under the terms of the GNU General Public License v2
4 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.127 2006/02/17 07:13:54 solar Exp $ 4 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.243 2012/04/29 05:41:14 vapier Exp $
5 * 5 *
6 * Copyright 2003-2006 Ned Ludd - <solar@gentoo.org> 6 * Copyright 2003-2007 Ned Ludd - <solar@gentoo.org>
7 * Copyright 2004-2006 Mike Frysinger - <vapier@gentoo.org> 7 * Copyright 2004-2007 Mike Frysinger - <vapier@gentoo.org>
8 */ 8 */
9 9
10static const char rcsid[] = "$Id: scanelf.c,v 1.243 2012/04/29 05:41:14 vapier Exp $";
11const char argv0[] = "scanelf";
12
10#include "paxinc.h" 13#include "paxinc.h"
11 14
12static const char *rcsid = "$Id: scanelf.c,v 1.127 2006/02/17 07:13:54 solar Exp $";
13#define argv0 "scanelf"
14
15#define IS_MODIFIER(c) (c == '%' || c == '#') 15#define IS_MODIFIER(c) (c == '%' || c == '#' || c == '+')
16
17
18 16
19/* prototypes */ 17/* prototypes */
20static int scanelf_elfobj(elfobj *elf); 18static int file_matches_list(const char *filename, char **matchlist);
21static int scanelf_elf(const char *filename, int fd, size_t len);
22static int scanelf_archive(const char *filename, int fd, size_t len);
23static void scanelf_file(const char *filename);
24static void scanelf_dir(const char *path);
25static void scanelf_ldpath(void);
26static void scanelf_envpath(void);
27static void usage(int status);
28static void parseargs(int argc, char *argv[]);
29static char *xstrdup(const char *s);
30static void *xmalloc(size_t size);
31static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n);
32#define xstrcat(dst,src,curr_len) xstrncat(dst,src,curr_len,0)
33static inline void xchrcat(char **dst, const char append, size_t *curr_len);
34 19
35/* variables to control behavior */ 20/* variables to control behavior */
36static char match_etypes[126] = ""; 21static 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;
59static char *find_section = NULL; 51static char *find_section = NULL;
52static array_t _find_section_arr = array_init_decl, *find_section_arr = &_find_section_arr;
60static char *out_format = NULL; 53static char *out_format = NULL;
61static char *search_path = NULL; 54static char *search_path = NULL;
62static char fix_elf = 0; 55static char fix_elf = 0;
63static char gmatch = 0; 56static char g_match = 0;
64static char use_ldcache = 0; 57static char use_ldcache = 0;
58static char use_ldpath = 0;
65 59
60static char **qa_textrels = NULL;
61static char **qa_execstack = NULL;
62static char **qa_wx_load = NULL;
63static int root_fd = AT_FDCWD;
64
66int match_bits = 0; 65static int match_bits = 0;
67caddr_t ldcache = 0; 66static unsigned int match_perms = 0;
67static void *ldcache = NULL;
68size_t ldcache_size = 0; 68static size_t ldcache_size = 0;
69unsigned long setpax = 0UL; 69static unsigned long setpax = 0UL;
70 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
71/* sub-funcs for scanelf_file() */ 146/* sub-funcs for scanelf_fileat() */
72static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab) 147static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **str)
73{ 148{
74 /* 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
75#define GET_SYMTABS(B) \ 158#define GET_SYMTABS(B) \
76 if (elf->elf_class == ELFCLASS ## B) { \ 159 if (elf->elf_class == ELFCLASS ## B) { \
77 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
78 /* debug sections */ \
79 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
80 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
81 /* runtime sections */ \
82 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
83 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
84 if (symtab && dynsym) { \ 160 if (symtab && dynsym) { \
161 Elf ## B ## _Shdr *esymtab = symtab; \
162 Elf ## B ## _Shdr *edynsym = dynsym; \
85 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \ 163 *sym = (EGET(esymtab->sh_size) > EGET(edynsym->sh_size)) ? symtab : dynsym; \
86 } else { \ 164 } else \
87 *sym = (void*)(symtab ? symtab : dynsym); \ 165 *sym = symtab ? symtab : dynsym; \
88 } \
89 if (strtab && dynstr) { \ 166 if (strtab && dynstr) { \
167 Elf ## B ## _Shdr *estrtab = strtab; \
168 Elf ## B ## _Shdr *edynstr = dynstr; \
90 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \ 169 *str = (EGET(estrtab->sh_size) > EGET(edynstr->sh_size)) ? strtab : dynstr; \
91 } else { \ 170 } else \
92 *tab = (void*)(strtab ? strtab : dynstr); \ 171 *str = strtab ? strtab : dynstr; \
93 } \
94 } 172 }
95 GET_SYMTABS(32) 173 GET_SYMTABS(32)
96 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)
97} 266}
98 267
99static char *scanelf_file_pax(elfobj *elf, char *found_pax) 268static char *scanelf_file_pax(elfobj *elf, char *found_pax)
100{ 269{
101 static char ret[7]; 270 static char ret[7];
116 continue; \ 285 continue; \
117 if (fix_elf && setpax) { \ 286 if (fix_elf && setpax) { \
118 /* set the paxctl flags */ \ 287 /* set the paxctl flags */ \
119 ESET(phdr[i].p_flags, setpax); \ 288 ESET(phdr[i].p_flags, setpax); \
120 } \ 289 } \
121 if (be_quiet && (EGET(phdr[i].p_flags) == 10240)) \ 290 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
122 continue; \ 291 continue; \
123 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); \
124 *found_pax = 1; \ 293 *found_pax = 1; \
125 ++shown; \ 294 ++shown; \
126 break; \ 295 break; \
128 } 297 }
129 SHOW_PAX(32) 298 SHOW_PAX(32)
130 SHOW_PAX(64) 299 SHOW_PAX(64)
131 } 300 }
132 301
302 /* Note: We do not support setting EI_PAX if not PT_PAX_FLAGS
303 * was found. This is known to break ELFs on glibc systems,
304 * and mainline PaX has deprecated use of this for a long time.
305 * We could support changing PT_GNU_STACK, but that doesn't
306 * seem like it's worth the effort. #411919
307 */
308
133 /* fall back to EI_PAX if no PT_PAX was found */ 309 /* fall back to EI_PAX if no PT_PAX was found */
134 if (!*ret) { 310 if (!*ret) {
135 static char *paxflags; 311 static char *paxflags;
136
137 if (fix_elf && setpax) {
138 /* set the chpax settings */
139 // ESET(EHDR ## B (elf->ehdr)->e_ident[EI_PAX]), setpax);
140 }
141
142 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf)); 312 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
143 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) { 313 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
144 *found_pax = 1; 314 *found_pax = 1;
145 return (be_wewy_wewy_quiet ? NULL : paxflags); 315 return (be_wewy_wewy_quiet ? NULL : paxflags);
146 } 316 }
176 uint32_t flags, check_flags; \ 346 uint32_t flags, check_flags; \
177 if (elf->phdr != NULL) { \ 347 if (elf->phdr != NULL) { \
178 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 348 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
179 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \ 349 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
180 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \ 350 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
351 if (multi_stack++) \
181 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \ 352 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
353 if (file_matches_list(elf->filename, qa_execstack)) \
354 continue; \
182 found = found_phdr; \ 355 found = found_phdr; \
183 offset = 0; \ 356 offset = 0; \
184 check_flags = PF_X; \ 357 check_flags = PF_X; \
185 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \ 358 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
359 if (multi_relro++) \
186 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \ 360 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
187 found = found_relro; \ 361 found = found_relro; \
188 offset = 4; \ 362 offset = 4; \
189 check_flags = PF_X; \ 363 check_flags = PF_X; \
190 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \ 364 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
191 if (ehdr->e_type == ET_DYN || ehdr->e_type == ET_EXEC) \ 365 if (EGET(ehdr->e_type) == ET_DYN || EGET(ehdr->e_type) == ET_EXEC) \
366 if (multi_load++ > max_pt_load) \
192 if (multi_load++ > max_pt_load) warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \ 367 warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
368 if (file_matches_list(elf->filename, qa_wx_load)) \
369 continue; \
193 found = found_load; \ 370 found = found_load; \
194 offset = 8; \ 371 offset = 8; \
195 check_flags = PF_W|PF_X; \ 372 check_flags = PF_W|PF_X; \
196 } else \ 373 } else \
197 continue; \ 374 continue; \
198 flags = EGET(phdr[i].p_flags); \ 375 flags = EGET(phdr[i].p_flags); \
199 if (be_quiet && ((flags & check_flags) != check_flags)) \ 376 if (be_quiet && ((flags & check_flags) != check_flags)) \
200 continue; \ 377 continue; \
201 if (fix_elf && ((flags & PF_X) != flags)) { \ 378 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
202 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \ 379 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
203 ret[3] = ret[7] = '!'; \ 380 ret[3] = ret[7] = '!'; \
204 flags = EGET(phdr[i].p_flags); \ 381 flags = EGET(phdr[i].p_flags); \
205 } \ 382 } \
206 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \ 383 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
210 } else if (elf->shdr != NULL) { \ 387 } else if (elf->shdr != NULL) { \
211 /* no program headers which means this is prob an object file */ \ 388 /* no program headers which means this is prob an object file */ \
212 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \ 389 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
213 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \ 390 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
214 char *str; \ 391 char *str; \
215 if ((void*)strtbl > (void*)elf->data_end) \ 392 if ((void*)strtbl > elf->data_end) \
216 goto skip_this_shdr##B; \ 393 goto skip_this_shdr##B; \
217 check_flags = SHF_WRITE|SHF_EXECINSTR; \ 394 check_flags = SHF_WRITE|SHF_EXECINSTR; \
218 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \ 395 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
219 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \ 396 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
220 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \ 397 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
234 break; \ 411 break; \
235 } \ 412 } \
236 } \ 413 } \
237 skip_this_shdr##B: \ 414 skip_this_shdr##B: \
238 if (!multi_stack) { \ 415 if (!multi_stack) { \
416 if (file_matches_list(elf->filename, qa_execstack)) \
417 return NULL; \
239 *found_phdr = 1; \ 418 *found_phdr = 1; \
240 shown = 1; \ 419 shown = 1; \
241 memcpy(ret, "!WX", 3); \ 420 memcpy(ret, "!WX", 3); \
242 } \ 421 } \
243 } \ 422 } \
248 if (be_wewy_wewy_quiet || (be_quiet && !shown)) 427 if (be_wewy_wewy_quiet || (be_quiet && !shown))
249 return NULL; 428 return NULL;
250 else 429 else
251 return ret; 430 return ret;
252} 431}
432
433/*
434 * See if this ELF contains a DT_TEXTREL tag in any of its
435 * PT_DYNAMIC sections.
436 */
253static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 437static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
254{ 438{
255 static const char *ret = "TEXTREL"; 439 static const char *ret = "TEXTREL";
256 unsigned long i; 440 unsigned long i;
257 441
258 if (!show_textrel && !show_textrels) return NULL; 442 if (!show_textrel && !show_textrels) return NULL;
443
444 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
259 445
260 if (elf->phdr) { 446 if (elf->phdr) {
261#define SHOW_TEXTREL(B) \ 447#define SHOW_TEXTREL(B) \
262 if (elf->elf_class == ELFCLASS ## B) { \ 448 if (elf->elf_class == ELFCLASS ## B) { \
263 Elf ## B ## _Dyn *dyn; \ 449 Elf ## B ## _Dyn *dyn; \
264 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 450 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
265 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 451 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
266 Elf ## B ## _Off offset; \ 452 Elf ## B ## _Off offset; \
267 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 453 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
268 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 454 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
269 offset = EGET(phdr[i].p_offset); \ 455 offset = EGET(phdr[i].p_offset); \
270 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 456 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
271 dyn = DYN ## B (elf->data + offset); \ 457 dyn = DYN ## B (elf->vdata + offset); \
272 while (EGET(dyn->d_tag) != DT_NULL) { \ 458 while (EGET(dyn->d_tag) != DT_NULL) { \
273 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \ 459 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
274 *found_textrel = 1; \ 460 *found_textrel = 1; \
275 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \ 461 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
276 return (be_wewy_wewy_quiet ? NULL : ret); \ 462 return (be_wewy_wewy_quiet ? NULL : ret); \
285 if (be_quiet || be_wewy_wewy_quiet) 471 if (be_quiet || be_wewy_wewy_quiet)
286 return NULL; 472 return NULL;
287 else 473 else
288 return " - "; 474 return " - ";
289} 475}
476
477/*
478 * Scan the .text section to see if there are any relocations in it.
479 * Should rewrite this to check PT_LOAD sections that are marked
480 * Executable rather than the section named '.text'.
481 */
290static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel) 482static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
291{ 483{
292 unsigned long s, r, rmax; 484 unsigned long s, r, rmax;
293 void *symtab_void, *strtab_void, *text_void; 485 void *symtab_void, *strtab_void, *text_void;
294 486
315 Elf ## B ## _Rela *rela; \ 507 Elf ## B ## _Rela *rela; \
316 /* search the section headers for relocations */ \ 508 /* search the section headers for relocations */ \
317 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \ 509 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
318 uint32_t sh_type = EGET(shdr[s].sh_type); \ 510 uint32_t sh_type = EGET(shdr[s].sh_type); \
319 if (sh_type == SHT_REL) { \ 511 if (sh_type == SHT_REL) { \
320 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \ 512 rel = REL ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
321 rela = NULL; \ 513 rela = NULL; \
322 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \ 514 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
323 } else if (sh_type == SHT_RELA) { \ 515 } else if (sh_type == SHT_RELA) { \
324 rel = NULL; \ 516 rel = NULL; \
325 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \ 517 rela = RELA ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
326 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \ 518 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
327 } else \ 519 } else \
328 continue; \ 520 continue; \
329 /* now see if any of the relocs are in the .text */ \ 521 /* now see if any of the relocs are in the .text */ \
330 for (r = 0; r < rmax; ++r) { \ 522 for (r = 0; r < rmax; ++r) { \
345 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \ 537 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
346 if (be_verbose <= 2) continue; \ 538 if (be_verbose <= 2) continue; \
347 } else \ 539 } else \
348 *found_textrels = 1; \ 540 *found_textrels = 1; \
349 /* locate this relocation symbol name */ \ 541 /* locate this relocation symbol name */ \
350 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 542 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
351 if ((void*)sym > (void*)elf->data_end) { \ 543 if ((void*)sym > elf->data_end) { \
352 warn("%s: corrupt ELF symbol", elf->filename); \ 544 warn("%s: corrupt ELF symbol", elf->filename); \
353 continue; \ 545 continue; \
354 } \ 546 } \
355 sym_max = ELF ## B ## _R_SYM(r_info); \ 547 sym_max = ELF ## B ## _R_SYM(r_info); \
356 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \ 548 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
359 sym = NULL; \ 551 sym = NULL; \
360 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 552 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
361 /* show the raw details about this reloc */ \ 553 /* show the raw details about this reloc */ \
362 printf(" %s: ", elf->base_filename); \ 554 printf(" %s: ", elf->base_filename); \
363 if (sym && sym->st_name) \ 555 if (sym && sym->st_name) \
364 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \ 556 printf("%s", elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
365 else \ 557 else \
366 printf("(memory/fake?)"); \ 558 printf("(memory/data?)"); \
367 printf(" [0x%lX]", (unsigned long)r_offset); \ 559 printf(" [0x%lX]", (unsigned long)r_offset); \
368 /* now try to find the closest symbol that this rel is probably in */ \ 560 /* now try to find the closest symbol that this rel is probably in */ \
369 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 561 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
370 func = NULL; \ 562 func = NULL; \
371 offset_tmp = 0; \ 563 offset_tmp = 0; \
372 while (sym_max--) { \ 564 while (sym_max--) { \
373 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \ 565 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
374 func = sym; \ 566 func = sym; \
375 offset_tmp = EGET(sym->st_value); \ 567 offset_tmp = EGET(sym->st_value); \
376 } \ 568 } \
377 ++sym; \ 569 ++sym; \
378 } \ 570 } \
379 printf(" in "); \ 571 printf(" in "); \
380 if (func && func->st_name) \ 572 if (func && func->st_name) { \
381 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \ 573 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
574 if (r_offset > EGET(func->st_size)) \
575 printf("(optimized out: previous %s)", func_name); \
382 else \ 576 else \
383 printf("(NULL: fake?)"); \ 577 printf("%s", func_name); \
578 } else \
579 printf("(optimized out)"); \
384 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \ 580 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
581 if (be_verbose && has_objdump) { \
582 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
583 char *sysbuf; \
584 size_t syslen; \
585 const char sysfmt[] = "objdump -r -R -d -w -l --start-address=0x%lX --stop-address=0x%lX %s | grep --color -i -C 3 '.*[[:space:]]%lX:[[:space:]]*R_.*'\n"; \
586 syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
587 sysbuf = xmalloc(syslen); \
588 if (end_addr < r_offset) \
589 /* not uncommon when things are optimized out */ \
590 end_addr = r_offset + 0x100; \
591 snprintf(sysbuf, syslen, sysfmt, \
592 (unsigned long)offset_tmp, \
593 (unsigned long)end_addr, \
594 elf->filename, \
595 (unsigned long)r_offset); \
596 fflush(stdout); \
597 if (system(sysbuf)) /* don't care */; \
598 fflush(stdout); \
599 free(sysbuf); \
600 } \
385 } \ 601 } \
386 } } 602 } }
387 SHOW_TEXTRELS(32) 603 SHOW_TEXTRELS(32)
388 SHOW_TEXTRELS(64) 604 SHOW_TEXTRELS(64)
389 } 605 }
391 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename); 607 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
392 608
393 return NULL; 609 return NULL;
394} 610}
395 611
396static void rpath_security_checks(elfobj *, char *, const char *);
397static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type) 612static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
398{ 613{
399 struct stat st; 614 struct stat st;
400 switch (*item) { 615 switch (*item) {
401 case '/': break; 616 case '/': break;
407 warnf("Security problem NULL %s in %s", dt_type, elf->filename); 622 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
408 break; 623 break;
409 case '$': 624 case '$':
410 if (fstat(elf->fd, &st) != -1) 625 if (fstat(elf->fd, &st) != -1)
411 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID)) 626 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
412 warnf("Security problem with %s='%s' in %s with mode set of %o", 627 warnf("Security problem with %s='%s' in %s with mode set of %o",
413 dt_type, item, elf->filename, st.st_mode & 07777); 628 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
414 break; 629 break;
415 default: 630 default:
416 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename); 631 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
417 break; 632 break;
418 } 633 }
419} 634}
420static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len) 635static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
421{ 636{
422 unsigned long i, s; 637 unsigned long i;
423 char *rpath, *runpath, **r; 638 char *rpath, *runpath, **r;
424 void *strtbl_void; 639 void *strtbl_void;
425 640
426 if (!show_rpath) return; 641 if (!show_rpath) return;
427 642
438 Elf ## B ## _Off offset; \ 653 Elf ## B ## _Off offset; \
439 Elf ## B ## _Xword word; \ 654 Elf ## B ## _Xword word; \
440 /* Scan all the program headers */ \ 655 /* Scan all the program headers */ \
441 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 656 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
442 /* Just scan dynamic headers */ \ 657 /* Just scan dynamic headers */ \
443 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 658 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
444 offset = EGET(phdr[i].p_offset); \ 659 offset = EGET(phdr[i].p_offset); \
445 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 660 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
446 /* Just scan dynamic RPATH/RUNPATH headers */ \ 661 /* Just scan dynamic RPATH/RUNPATH headers */ \
447 dyn = DYN ## B (elf->data + offset); \ 662 dyn = DYN ## B (elf->vdata + offset); \
448 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \ 663 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
449 if (word == DT_RPATH) { \ 664 if (word == DT_RPATH) { \
450 r = &rpath; \ 665 r = &rpath; \
451 } else if (word == DT_RUNPATH) { \ 666 } else if (word == DT_RUNPATH) { \
452 r = &runpath; \ 667 r = &runpath; \
456 } \ 671 } \
457 /* Verify the memory is somewhat sane */ \ 672 /* Verify the memory is somewhat sane */ \
458 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 673 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
459 if (offset < (Elf ## B ## _Off)elf->len) { \ 674 if (offset < (Elf ## B ## _Off)elf->len) { \
460 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \ 675 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
461 *r = (char*)(elf->data + offset); \ 676 *r = elf->data + offset; \
462 /* cache the length in case we need to nuke this section later on */ \ 677 /* cache the length in case we need to nuke this section later on */ \
463 if (fix_elf) \ 678 if (fix_elf) \
464 offset = strlen(*r); \ 679 offset = strlen(*r); \
465 /* If quiet, don't output paths in ld.so.conf */ \ 680 /* If quiet, don't output paths in ld.so.conf */ \
466 if (be_quiet) { \ 681 if (be_quiet) { \
472 /* scan each path in : delimited list */ \ 687 /* scan each path in : delimited list */ \
473 while (start) { \ 688 while (start) { \
474 rpath_security_checks(elf, start, get_elfdtype(word)); \ 689 rpath_security_checks(elf, start, get_elfdtype(word)); \
475 end = strchr(start, ':'); \ 690 end = strchr(start, ':'); \
476 len = (end ? abs(end - start) : strlen(start)); \ 691 len = (end ? abs(end - start) : strlen(start)); \
477 if (use_ldcache) \ 692 if (use_ldcache) { \
478 for (s = 0; ldpaths[s]; ++s) \ 693 size_t n; \
694 const char *ldpath; \
695 array_for_each(ldpaths, n, ldpath) \
479 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \ 696 if (!strncmp(ldpath, start, len) && !ldpath[len]) { \
480 *r = end; \ 697 *r = end; \
481 /* corner case ... if RPATH reads "/usr/lib:", we want \ 698 /* corner case ... if RPATH reads "/usr/lib:", we want \
482 * to show ':' rather than '' */ \ 699 * to show ':' rather than '' */ \
483 if (end && end[1] != '\0') \ 700 if (end && end[1] != '\0') \
484 (*r)++; \ 701 (*r)++; \
485 break; \ 702 break; \
486 } \ 703 } \
704 } \
487 if (!*r || !end) \ 705 if (!*r || !end) \
488 break; \ 706 break; \
489 else \ 707 else \
490 start = start + len + 1; \ 708 start = start + len + 1; \
491 } \ 709 } \
576#define FLAG_S390_LIB64 0x0400 794#define FLAG_S390_LIB64 0x0400
577#define FLAG_POWERPC_LIB64 0x0500 795#define FLAG_POWERPC_LIB64 0x0500
578#define FLAG_MIPS64_LIBN32 0x0600 796#define FLAG_MIPS64_LIBN32 0x0600
579#define FLAG_MIPS64_LIBN64 0x0700 797#define FLAG_MIPS64_LIBN64 0x0700
580 798
581static char *lookup_cache_lib(elfobj *, char *); 799#if defined(__GLIBC__) || defined(__UCLIBC__)
800
582static char *lookup_cache_lib(elfobj *elf, char *fname) 801static char *lookup_cache_lib(elfobj *elf, const char *fname)
583{ 802{
584 int fd = 0; 803 int fd;
585 char *strs; 804 char *strs;
586 static char buf[__PAX_UTILS_PATH_MAX] = ""; 805 static char buf[__PAX_UTILS_PATH_MAX] = "";
587 const char *cachefile = "/etc/ld.so.cache"; 806 const char *cachefile = root_rel_path("/etc/ld.so.cache");
588 struct stat st; 807 struct stat st;
589 808
590 typedef struct { 809 typedef struct {
591 char magic[LDSO_CACHE_MAGIC_LEN]; 810 char magic[LDSO_CACHE_MAGIC_LEN];
592 char version[LDSO_CACHE_VER_LEN]; 811 char version[LDSO_CACHE_VER_LEN];
602 libentry_t *libent; 821 libentry_t *libent;
603 822
604 if (fname == NULL) 823 if (fname == NULL)
605 return NULL; 824 return NULL;
606 825
607 if (ldcache == 0) { 826 if (ldcache == NULL) {
608 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1) 827 if (fstatat(root_fd, cachefile, &st, 0))
828 return NULL;
829
830 fd = openat(root_fd, cachefile, O_RDONLY);
831 if (fd == -1)
609 return NULL; 832 return NULL;
610 833
611 /* cache these values so we only map/unmap the cache file once */ 834 /* cache these values so we only map/unmap the cache file once */
612 ldcache_size = st.st_size; 835 ldcache_size = st.st_size;
613 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0); 836 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
614
615 close(fd); 837 close(fd);
616 838
617 if (ldcache == (caddr_t)-1) { 839 if (ldcache == MAP_FAILED) {
618 ldcache = 0; 840 ldcache = NULL;
619 return NULL; 841 return NULL;
620 } 842 }
621 843
622 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN)) 844 if (memcmp(header->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN) ||
845 memcmp(header->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
846 {
847 munmap(ldcache, ldcache_size);
848 ldcache = NULL;
623 return NULL; 849 return NULL;
624 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
625 return NULL;
626 } 850 }
851 } else
852 header = ldcache;
627 853
628 header = (header_t *) ldcache;
629 libent = (libentry_t *) (ldcache + sizeof(header_t)); 854 libent = ldcache + sizeof(header_t);
630 strs = (char *) &libent[header->nlibs]; 855 strs = (char *) &libent[header->nlibs];
631 856
632 for (fd = 0; fd < header->nlibs; fd++) { 857 for (fd = 0; fd < header->nlibs; ++fd) {
633 /* this should be more fine grained, but for now we assume that 858 /* This should be more fine grained, but for now we assume that
634 * diff arches will not be cached together. and we ignore the 859 * diff arches will not be cached together, and we ignore the
635 * the different multilib mips cases. */ 860 * the different multilib mips cases.
861 */
636 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK)) 862 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
637 continue; 863 continue;
638 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK)) 864 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
639 continue; 865 continue;
640 866
641 if (strcmp(fname, strs + libent[fd].sooffset) != 0) 867 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
642 continue; 868 continue;
869
870 /* Return first hit because that is how the ldso rolls */
643 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf)); 871 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
872 break;
644 } 873 }
874
645 return buf; 875 return buf;
646} 876}
647 877
878#elif defined(__NetBSD__)
879static char *lookup_cache_lib(elfobj *elf, const char *fname)
880{
881 static char buf[__PAX_UTILS_PATH_MAX] = "";
882 static struct stat st;
883 size_t n;
884 char *ldpath;
885
886 array_for_each(ldpath, n, ldpath) {
887 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", ldpath, fname) >= sizeof(buf))
888 continue; /* if the pathname is too long, or something went wrong, ignore */
889
890 if (stat(buf, &st) != 0)
891 continue; /* if the lib doesn't exist in *ldpath, look further */
892
893 /* NetBSD doesn't actually do sanity checks, it just loads the file
894 * and if that doesn't work, continues looking in other directories.
895 * This cannot easily be safely emulated, unfortunately. For now,
896 * just assume that if it exists, it's a valid library. */
897
898 return buf;
899 }
900
901 /* not found in any path */
902 return NULL;
903}
904#else
905#ifdef __ELF__
906#warning Cache support not implemented for your target
907#endif
908static char *lookup_cache_lib(elfobj *elf, const char *fname)
909{
910 return NULL;
911}
912#endif
913
914static char *lookup_config_lib(elfobj *elf, char *fname)
915{
916 static char buf[__PAX_UTILS_PATH_MAX] = "";
917 const char *ldpath;
918 size_t n;
919
920 array_for_each(ldpaths, n, ldpath) {
921 snprintf(buf, sizeof(buf), "%s/%s", root_rel_path(ldpath), fname);
922 if (faccessat(root_fd, buf, F_OK, AT_SYMLINK_NOFOLLOW) == 0)
923 return buf;
924 }
925
926 return NULL;
927}
648 928
649static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len) 929static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
650{ 930{
651 unsigned long i; 931 unsigned long i;
652 char *needed; 932 char *needed;
653 void *strtbl_void; 933 void *strtbl_void;
654 char *p; 934 char *p;
655 935
936 /*
937 * -n -> op==0 -> print all
938 * -N -> op==1 -> print requested
939 */
656 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL; 940 if ((op == 0 && !show_needed) || (op == 1 && !find_lib))
941 return NULL;
657 942
658 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 943 strtbl_void = elf_findsecbyname(elf, ".dynstr");
659 944
660 if (elf->phdr && strtbl_void) { 945 if (elf->phdr && strtbl_void) {
661#define SHOW_NEEDED(B) \ 946#define SHOW_NEEDED(B) \
663 Elf ## B ## _Dyn *dyn; \ 948 Elf ## B ## _Dyn *dyn; \
664 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 949 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
665 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 950 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
666 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 951 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
667 Elf ## B ## _Off offset; \ 952 Elf ## B ## _Off offset; \
953 size_t matched = 0; \
954 /* Walk all the program headers to find the PT_DYNAMIC */ \
668 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 955 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
669 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 956 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) \
957 continue; \
670 offset = EGET(phdr[i].p_offset); \ 958 offset = EGET(phdr[i].p_offset); \
671 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 959 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
960 continue; \
961 /* Walk all the dynamic tags to find NEEDED entries */ \
672 dyn = DYN ## B (elf->data + offset); \ 962 dyn = DYN ## B (elf->vdata + offset); \
673 while (EGET(dyn->d_tag) != DT_NULL) { \ 963 while (EGET(dyn->d_tag) != DT_NULL) { \
674 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 964 if (EGET(dyn->d_tag) == DT_NEEDED) { \
675 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 965 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
676 if (offset >= (Elf ## B ## _Off)elf->len) { \ 966 if (offset >= (Elf ## B ## _Off)elf->len) { \
677 ++dyn; \ 967 ++dyn; \
678 continue; \ 968 continue; \
679 } \ 969 } \
680 needed = (char*)(elf->data + offset); \ 970 needed = elf->data + offset; \
681 if (op == 0) { \ 971 if (op == 0) { \
972 /* -n -> print all entries */ \
682 if (!be_wewy_wewy_quiet) { \ 973 if (!be_wewy_wewy_quiet) { \
683 if (*found_needed) xchrcat(ret, ',', ret_len); \ 974 if (*found_needed) xchrcat(ret, ',', ret_len); \
684 if (use_ldcache) \ 975 if (use_ldpath) { \
976 if ((p = lookup_config_lib(elf, needed)) != NULL) \
977 needed = p; \
978 } else if (use_ldcache) { \
685 if ((p = lookup_cache_lib(elf, needed)) != NULL) \ 979 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
686 needed = p; \ 980 needed = p; \
981 } \
687 xstrcat(ret, needed, ret_len); \ 982 xstrcat(ret, needed, ret_len); \
688 } \ 983 } \
689 *found_needed = 1; \ 984 *found_needed = 1; \
690 } else { \ 985 } else { \
691 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \ 986 /* -N -> print matching entries */ \
987 size_t n; \
988 const char *find_lib_name; \
989 \
990 array_for_each(find_lib_arr, n, find_lib_name) { \
991 int invert = 1; \
992 if (find_lib_name[0] == '!') \
993 invert = 0, ++find_lib_name; \
994 if (!strcmp(find_lib_name, needed) == invert) \
995 ++matched; \
996 } \
997 \
998 if (matched == array_cnt(find_lib_arr)) { \
692 *found_lib = 1; \ 999 *found_lib = 1; \
693 return (be_wewy_wewy_quiet ? NULL : needed); \ 1000 return (be_wewy_wewy_quiet ? NULL : find_lib); \
694 } \ 1001 } \
695 } \ 1002 } \
696 } \ 1003 } \
697 ++dyn; \ 1004 ++dyn; \
698 } \ 1005 } \
727} 1034}
728static char *scanelf_file_bind(elfobj *elf, char *found_bind) 1035static char *scanelf_file_bind(elfobj *elf, char *found_bind)
729{ 1036{
730 unsigned long i; 1037 unsigned long i;
731 struct stat s; 1038 struct stat s;
1039 char dynamic = 0;
732 1040
733 if (!show_bind) return NULL; 1041 if (!show_bind) return NULL;
734 if (!elf->phdr) return NULL; 1042 if (!elf->phdr) return NULL;
735 1043
736#define SHOW_BIND(B) \ 1044#define SHOW_BIND(B) \
738 Elf ## B ## _Dyn *dyn; \ 1046 Elf ## B ## _Dyn *dyn; \
739 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 1047 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
740 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 1048 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
741 Elf ## B ## _Off offset; \ 1049 Elf ## B ## _Off offset; \
742 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 1050 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
743 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 1051 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1052 dynamic = 1; \
744 offset = EGET(phdr[i].p_offset); \ 1053 offset = EGET(phdr[i].p_offset); \
745 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 1054 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
746 dyn = DYN ## B (elf->data + offset); \ 1055 dyn = DYN ## B (elf->vdata + offset); \
747 while (EGET(dyn->d_tag) != DT_NULL) { \ 1056 while (EGET(dyn->d_tag) != DT_NULL) { \
748 if (EGET(dyn->d_tag) == DT_BIND_NOW || \ 1057 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
749 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \ 1058 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
750 { \ 1059 { \
751 if (be_quiet) return NULL; \ 1060 if (be_quiet) return NULL; \
759 SHOW_BIND(32) 1068 SHOW_BIND(32)
760 SHOW_BIND(64) 1069 SHOW_BIND(64)
761 1070
762 if (be_wewy_wewy_quiet) return NULL; 1071 if (be_wewy_wewy_quiet) return NULL;
763 1072
1073 /* don't output anything if quiet mode and the ELF is static or not setuid */
764 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) { 1074 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
765 return NULL; 1075 return NULL;
766 } else { 1076 } else {
767 *found_bind = 1; 1077 *found_bind = 1;
768 return (char *) "LAZY"; 1078 return (char *)(dynamic ? "LAZY" : "STATIC");
769 } 1079 }
770} 1080}
771static char *scanelf_file_soname(elfobj *elf, char *found_soname) 1081static char *scanelf_file_soname(elfobj *elf, char *found_soname)
772{ 1082{
773 unsigned long i; 1083 unsigned long i;
785 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 1095 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
786 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 1096 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
787 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 1097 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
788 Elf ## B ## _Off offset; \ 1098 Elf ## B ## _Off offset; \
789 /* only look for soname in shared objects */ \ 1099 /* only look for soname in shared objects */ \
790 if (ehdr->e_type != ET_DYN) \ 1100 if (EGET(ehdr->e_type) != ET_DYN) \
791 return NULL; \ 1101 return NULL; \
792 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 1102 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
793 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 1103 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
794 offset = EGET(phdr[i].p_offset); \ 1104 offset = EGET(phdr[i].p_offset); \
795 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 1105 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
796 dyn = DYN ## B (elf->data + offset); \ 1106 dyn = DYN ## B (elf->vdata + offset); \
797 while (EGET(dyn->d_tag) != DT_NULL) { \ 1107 while (EGET(dyn->d_tag) != DT_NULL) { \
798 if (EGET(dyn->d_tag) == DT_SONAME) { \ 1108 if (EGET(dyn->d_tag) == DT_SONAME) { \
799 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 1109 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
800 if (offset >= (Elf ## B ## _Off)elf->len) { \ 1110 if (offset >= (Elf ## B ## _Off)elf->len) { \
801 ++dyn; \ 1111 ++dyn; \
802 continue; \ 1112 continue; \
803 } \ 1113 } \
804 soname = (char*)(elf->data + offset); \ 1114 soname = elf->data + offset; \
805 *found_soname = 1; \ 1115 *found_soname = 1; \
806 return (be_wewy_wewy_quiet ? NULL : soname); \ 1116 return (be_wewy_wewy_quiet ? NULL : soname); \
807 } \ 1117 } \
808 ++dyn; \ 1118 ++dyn; \
809 } \ 1119 } \
812 SHOW_SONAME(64) 1122 SHOW_SONAME(64)
813 } 1123 }
814 1124
815 return NULL; 1125 return NULL;
816} 1126}
1127
1128/*
1129 * We support the symbol form:
1130 * [%[modifiers]%][[+-]<symbol name>][,[.....]]
1131 * If the symbol name is empty, then all symbols are matched.
1132 * If the symbol name is a glob ("*"), then all symbols are dumped (debug).
1133 * Do not rely on this output format at all.
1134 * Otherwise the symbol name is used to search (either regex or string compare).
1135 * If the first char of the symbol name is a plus ("+"), then only match
1136 * defined symbols. If it's a minus ("-"), only match undefined symbols.
1137 * Putting modifiers in between the percent signs allows for more in depth
1138 * filters. There are groups of modifiers. If you don't specify a member
1139 * of a group, then all types in that group are matched. The current
1140 * groups and their types are:
1141 * STT group: STT_NOTYPE:n STT_OBJECT:o STT_FUNC:f STT_FILE:F
1142 * STB group: STB_LOCAL:l STB_GLOBAL:g STB_WEAK:w
1143 * SHN group: SHN_UNDEF:u SHN_ABS:a SHN_COMMON:c {defined}:d
1144 * The "defined" value in the SHN group does not correspond to a SHN_xxx define.
1145 * You can search for multiple symbols at once by seperating with a comma (",").
1146 *
1147 * Some examples:
1148 * ELFs with a weak function "foo":
1149 * scanelf -s %wf%foo <ELFs>
1150 * ELFs that define the symbol "main":
1151 * scanelf -s +main <ELFs>
1152 * scanelf -s %d%main <ELFs>
1153 * ELFs that refer to the undefined symbol "brk":
1154 * scanelf -s -brk <ELFs>
1155 * scanelf -s %u%brk <ELFs>
1156 * All global defined objects in an ELF:
1157 * scanelf -s %ogd% <ELF>
1158 */
1159static void
1160scanelf_match_symname(elfobj *elf, char *found_sym, char **ret, size_t *ret_len, const char *symname,
1161 unsigned int stt, unsigned int stb, unsigned int shn, unsigned long size)
1162{
1163 char *this_sym, *next_sym, saved = saved;
1164
1165 /* allow the user to specify a comma delimited list of symbols to search for */
1166 next_sym = NULL;
1167 do {
1168 bool inc_notype, inc_object, inc_func, inc_file,
1169 inc_local, inc_global, inc_weak,
1170 inc_def, inc_undef, inc_abs, inc_common;
1171
1172 if (next_sym) {
1173 next_sym[-1] = saved;
1174 this_sym = next_sym;
1175 } else
1176 this_sym = find_sym;
1177 if ((next_sym = strchr(this_sym, ','))) {
1178 /* make parsing easier by killing the comma temporarily */
1179 saved = *next_sym;
1180 *next_sym = '\0';
1181 next_sym += 1;
1182 }
1183
1184 /* symbol selection! */
1185 inc_notype = inc_object = inc_func = inc_file = \
1186 inc_local = inc_global = inc_weak = \
1187 inc_def = inc_undef = inc_abs = inc_common = \
1188 (*this_sym != '%');
1189
1190 /* parse the contents of %...% */
1191 if (!inc_notype) {
1192 while (*(this_sym++)) {
1193 if (*this_sym == '%') {
1194 ++this_sym;
1195 break;
1196 }
1197 switch (*this_sym) {
1198 case 'n': inc_notype = true; break;
1199 case 'o': inc_object = true; break;
1200 case 'f': inc_func = true; break;
1201 case 'F': inc_file = true; break;
1202 case 'l': inc_local = true; break;
1203 case 'g': inc_global = true; break;
1204 case 'w': inc_weak = true; break;
1205 case 'd': inc_def = true; break;
1206 case 'u': inc_undef = true; break;
1207 case 'a': inc_abs = true; break;
1208 case 'c': inc_common = true; break;
1209 default: err("invalid symbol selector '%c'", *this_sym);
1210 }
1211 }
1212
1213 /* If no types are matched, not match all */
1214 if (!inc_notype && !inc_object && !inc_func && !inc_file)
1215 inc_notype = inc_object = inc_func = inc_file = true;
1216 if (!inc_local && !inc_global && !inc_weak)
1217 inc_local = inc_global = inc_weak = true;
1218 if (!inc_def && !inc_undef && !inc_abs && !inc_common)
1219 inc_def = inc_undef = inc_abs = inc_common = true;
1220
1221 /* backwards compat for defined/undefined short hand */
1222 } else if (*this_sym == '+') {
1223 inc_undef = false;
1224 ++this_sym;
1225 } else if (*this_sym == '-') {
1226 inc_def = inc_abs = inc_common = false;
1227 ++this_sym;
1228 }
1229
1230 /* filter symbols */
1231 if ((!inc_notype && stt == STT_NOTYPE) || \
1232 (!inc_object && stt == STT_OBJECT) || \
1233 (!inc_func && stt == STT_FUNC ) || \
1234 (!inc_file && stt == STT_FILE ) || \
1235 (!inc_local && stb == STB_LOCAL ) || \
1236 (!inc_global && stb == STB_GLOBAL) || \
1237 (!inc_weak && stb == STB_WEAK ) || \
1238 (!inc_def && shn && shn < SHN_LORESERVE) || \
1239 (!inc_undef && shn == SHN_UNDEF ) || \
1240 (!inc_abs && shn == SHN_ABS ) || \
1241 (!inc_common && shn == SHN_COMMON))
1242 continue;
1243
1244 if (*this_sym == '*') {
1245 /* a "*" symbol gets you debug output */
1246 printf("%s(%s) %5lX %15s %15s %15s %s\n",
1247 ((*found_sym == 0) ? "\n\t" : "\t"),
1248 elf->base_filename,
1249 size,
1250 get_elfstttype(stt),
1251 get_elfstbtype(stb),
1252 get_elfshntype(shn),
1253 symname);
1254 goto matched;
1255
1256 } else {
1257 if (g_match) {
1258 /* regex match the symbol */
1259 if (rematch(this_sym, symname, REG_EXTENDED) != 0)
1260 continue;
1261
1262 } else if (*this_sym) {
1263 /* give empty symbols a "pass", else do a normal compare */
1264 const size_t len = strlen(this_sym);
1265 if (!(strncmp(this_sym, symname, len) == 0 &&
1266 /* Accept unversioned symbol names */
1267 (symname[len] == '\0' || symname[len] == '@')))
1268 continue;
1269 }
1270
1271 if (be_semi_verbose) {
1272 char buf[1024];
1273 snprintf(buf, sizeof(buf), "%lX %s %s",
1274 size,
1275 get_elfstttype(stt),
1276 this_sym);
1277 *ret = xstrdup(buf);
1278 } else {
1279 if (*ret) xchrcat(ret, ',', ret_len);
1280 xstrcat(ret, symname, ret_len);
1281 }
1282
1283 goto matched;
1284 }
1285 } while (next_sym);
1286
1287 return;
1288
1289 matched:
1290 *found_sym = 1;
1291 if (next_sym)
1292 next_sym[-1] = saved;
1293}
1294
817static char *scanelf_file_sym(elfobj *elf, char *found_sym) 1295static const char *scanelf_file_sym(elfobj *elf, char *found_sym)
818{ 1296{
819 unsigned long i;
820 char *ret; 1297 char *ret;
821 void *symtab_void, *strtab_void; 1298 void *symtab_void, *strtab_void;
822 1299
823 if (!find_sym) return NULL; 1300 if (!find_sym) return NULL;
824 ret = find_sym; 1301 ret = NULL;
825 1302
826 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void); 1303 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
827 1304
828 if (symtab_void && strtab_void) { 1305 if (symtab_void && strtab_void) {
829#define FIND_SYM(B) \ 1306#define FIND_SYM(B) \
830 if (elf->elf_class == ELFCLASS ## B) { \ 1307 if (elf->elf_class == ELFCLASS ## B) { \
831 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 1308 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
832 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 1309 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
833 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 1310 Elf ## B ## _Sym *sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
834 unsigned long cnt = EGET(symtab->sh_entsize); \ 1311 Elf ## B ## _Word i, cnt = EGET(symtab->sh_entsize); \
835 char *symname; \ 1312 char *symname; \
1313 size_t ret_len = 0; \
836 if (cnt) \ 1314 if (cnt) \
837 cnt = EGET(symtab->sh_size) / cnt; \ 1315 cnt = EGET(symtab->sh_size) / cnt; \
838 for (i = 0; i < cnt; ++i) { \ 1316 for (i = 0; i < cnt; ++i) { \
1317 if ((void*)sym > elf->data_end) { \
1318 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1319 goto break_out; \
1320 } \
839 if (sym->st_name) { \ 1321 if (sym->st_name) { \
1322 /* make sure the symbol name is in acceptable memory range */ \
840 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 1323 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
841 if ((void*)symname > (void*)elf->data_end) { \ 1324 if ((void*)symname > elf->data_end) { \
842 warnf("%s: corrupt ELF symbols", elf->filename); \ 1325 warnf("%s: corrupt ELF symbols", elf->filename); \
1326 ++sym; \
843 continue; \ 1327 continue; \
844 } \ 1328 } \
845 if (*find_sym == '*') { \ 1329 scanelf_match_symname(elf, found_sym, \
846 printf("%s(%s) %5lX %15s %s\n", \ 1330 &ret, &ret_len, symname, \
847 ((*found_sym == 0) ? "\n\t" : "\t"), \ 1331 ELF##B##_ST_TYPE(EGET(sym->st_info)), \
848 elf->base_filename, \ 1332 ELF##B##_ST_BIND(EGET(sym->st_info)), \
849 (unsigned long)sym->st_size, \ 1333 EGET(sym->st_shndx), \
850 get_elfstttype(sym->st_info), \ 1334 /* st_size can be 64bit, but no one is really that big, so screw em */ \
851 symname); \ 1335 EGET(sym->st_size)); \
852 *found_sym = 1; \
853 } else { \
854 char *this_sym, *next_sym; \
855 this_sym = find_sym; \
856 do { \
857 next_sym = strchr(this_sym, ','); \
858 if (next_sym == NULL) \
859 next_sym = this_sym + strlen(this_sym); \
860 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
861 (strcmp(symname, versioned_symname) == 0)) { \
862 ret = this_sym; \
863 (*found_sym)++; \
864 goto break_out; \
865 } \
866 this_sym = next_sym + 1; \
867 } while (*next_sym != '\0'); \
868 } \
869 } \ 1336 } \
870 ++sym; \ 1337 ++sym; \
871 } } 1338 } \
1339 }
872 FIND_SYM(32) 1340 FIND_SYM(32)
873 FIND_SYM(64) 1341 FIND_SYM(64)
874 } 1342 }
875 1343
876break_out: 1344break_out:
879 if (*find_sym != '*' && *found_sym) 1347 if (*find_sym != '*' && *found_sym)
880 return ret; 1348 return ret;
881 if (be_quiet) 1349 if (be_quiet)
882 return NULL; 1350 return NULL;
883 else 1351 else
884 return (char *)" - "; 1352 return " - ";
885} 1353}
886 1354
887
888static char *scanelf_file_sections(elfobj *elf, char *found_section) 1355static const char *scanelf_file_sections(elfobj *elf, char *found_section)
889{ 1356{
890 if (!find_section) 1357 if (!find_section)
891 return NULL; 1358 return NULL;
892 1359
893#define FIND_SECTION(B) \ 1360#define FIND_SECTION(B) \
894 if (elf->elf_class == ELFCLASS ## B) { \ 1361 if (elf->elf_class == ELFCLASS ## B) { \
1362 size_t matched, n; \
1363 int invert; \
1364 const char *section_name; \
895 Elf ## B ## _Shdr *section; \ 1365 Elf ## B ## _Shdr *section; \
1366 \
1367 matched = 0; \
1368 array_for_each(find_section_arr, n, section_name) { \
1369 invert = (*section_name == '!' ? 1 : 0); \
896 section = SHDR ## B (elf_findsecbyname(elf, find_section)); \ 1370 section = SHDR ## B (elf_findsecbyname(elf, section_name + invert)); \
897 if (section != NULL) \ 1371 if ((section == NULL && invert) || (section != NULL && !invert)) \
1372 ++matched; \
1373 } \
1374 \
1375 if (matched == array_cnt(find_section_arr)) \
898 *found_section = 1; \ 1376 *found_section = 1; \
899 } 1377 }
900 FIND_SECTION(32) 1378 FIND_SECTION(32)
901 FIND_SECTION(64) 1379 FIND_SECTION(64)
902 1380
903
904 if (be_wewy_wewy_quiet) return NULL; 1381 if (be_wewy_wewy_quiet)
1382 return NULL;
905 1383
906 if (*found_section) 1384 if (*found_section)
907 return find_section; 1385 return find_section;
908 1386
909 if (be_quiet) 1387 if (be_quiet)
910 return NULL; 1388 return NULL;
911 else 1389 else
912 return (char *)" - "; 1390 return " - ";
913} 1391}
914 1392
915/* scan an elf file and show all the fun stuff */ 1393/* scan an elf file and show all the fun stuff */
916#define prints(str) write(fileno(stdout), str, strlen(str)) 1394#define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
917static int scanelf_elfobj(elfobj *elf) 1395static int scanelf_elfobj(elfobj *elf)
918{ 1396{
919 unsigned long i; 1397 unsigned long i;
920 char found_pax, found_phdr, found_relro, found_load, found_textrel, 1398 char found_pax, found_phdr, found_relro, found_load, found_textrel,
921 found_rpath, found_needed, found_interp, found_bind, found_soname, 1399 found_rpath, found_needed, found_interp, found_bind, found_soname,
922 found_sym, found_lib, found_file, found_textrels, found_section; 1400 found_sym, found_lib, found_file, found_textrels, found_section;
923 static char *out_buffer = NULL; 1401 static char *out_buffer = NULL;
924 static size_t out_len; 1402 static size_t out_len;
925 1403
926 found_pax = found_phdr = found_relro = found_load = found_textrel = \ 1404 found_pax = found_phdr = found_relro = found_load = found_textrel = \
935 printf("%s: scanning file\n", elf->filename); 1413 printf("%s: scanning file\n", elf->filename);
936 1414
937 /* init output buffer */ 1415 /* init output buffer */
938 if (!out_buffer) { 1416 if (!out_buffer) {
939 out_len = sizeof(char) * 80; 1417 out_len = sizeof(char) * 80;
940 out_buffer = (char*)xmalloc(out_len); 1418 out_buffer = xmalloc(out_len);
941 } 1419 }
942 *out_buffer = '\0'; 1420 *out_buffer = '\0';
943 1421
944 /* show the header */ 1422 /* show the header */
945 if (!be_quiet && show_banner) { 1423 if (!be_quiet && show_banner) {
946 for (i = 0; out_format[i]; ++i) { 1424 for (i = 0; out_format[i]; ++i) {
947 if (!IS_MODIFIER(out_format[i])) continue; 1425 if (!IS_MODIFIER(out_format[i])) continue;
948 1426
949 switch (out_format[++i]) { 1427 switch (out_format[++i]) {
1428 case '+': break;
950 case '%': break; 1429 case '%': break;
951 case '#': break; 1430 case '#': break;
952 case 'F': 1431 case 'F':
953 case 'p': 1432 case 'p':
954 case 'f': prints("FILE "); found_file = 1; break; 1433 case 'f': prints("FILE "); found_file = 1; break;
955 case 'o': prints(" TYPE "); break; 1434 case 'o': prints(" TYPE "); break;
956 case 'x': prints(" PAX "); break; 1435 case 'x': prints(" PAX "); break;
957 case 'e': prints("STK/REL/PTL "); break; 1436 case 'e': prints("STK/REL/PTL "); break;
958 case 't': prints("TEXTREL "); break; 1437 case 't': prints("TEXTREL "); break;
959 case 'r': prints("RPATH "); break; 1438 case 'r': prints("RPATH "); break;
1439 case 'M': prints("CLASS "); break;
1440 case 'l':
960 case 'n': prints("NEEDED "); break; 1441 case 'n': prints("NEEDED "); break;
961 case 'i': prints("INTERP "); break; 1442 case 'i': prints("INTERP "); break;
962 case 'b': prints("BIND "); break; 1443 case 'b': prints("BIND "); break;
1444 case 'Z': prints("SIZE "); break;
963 case 'S': prints("SONAME "); break; 1445 case 'S': prints("SONAME "); break;
964 case 's': prints("SYM "); break; 1446 case 's': prints("SYM "); break;
965 case 'N': prints("LIB "); break; 1447 case 'N': prints("LIB "); break;
966 case 'T': prints("TEXTRELS "); break; 1448 case 'T': prints("TEXTRELS "); break;
967 case 'k': prints("SECTION "); break; 1449 case 'k': prints("SECTION "); break;
1450 case 'a': prints("ARCH "); break;
1451 case 'I': prints("OSABI "); break;
1452 case 'Y': prints("EABI "); break;
1453 case 'O': prints("PERM "); break;
1454 case 'D': prints("ENDIAN "); break;
968 default: warnf("'%c' has no title ?", out_format[i]); 1455 default: warnf("'%c' has no title ?", out_format[i]);
969 } 1456 }
970 } 1457 }
971 if (!found_file) prints("FILE "); 1458 if (!found_file) prints("FILE ");
972 prints("\n"); 1459 prints("\n");
976 1463
977 /* dump all the good stuff */ 1464 /* dump all the good stuff */
978 for (i = 0; out_format[i]; ++i) { 1465 for (i = 0; out_format[i]; ++i) {
979 const char *out; 1466 const char *out;
980 const char *tmp; 1467 const char *tmp;
981 1468 static char ubuf[sizeof(unsigned long)*2];
982 if (!IS_MODIFIER(out_format[i])) { 1469 if (!IS_MODIFIER(out_format[i])) {
983 xchrcat(&out_buffer, out_format[i], &out_len); 1470 xchrcat(&out_buffer, out_format[i], &out_len);
984 continue; 1471 continue;
985 } 1472 }
986 1473
987 out = NULL; 1474 out = NULL;
988 be_wewy_wewy_quiet = (out_format[i] == '#'); 1475 be_wewy_wewy_quiet = (out_format[i] == '#');
1476 be_semi_verbose = (out_format[i] == '+');
989 switch (out_format[++i]) { 1477 switch (out_format[++i]) {
1478 case '+':
990 case '%': 1479 case '%':
991 case '#': 1480 case '#':
992 xchrcat(&out_buffer, out_format[i], &out_len); break; 1481 xchrcat(&out_buffer, out_format[i], &out_len); break;
993 case 'F': 1482 case 'F':
994 found_file = 1; 1483 found_file = 1;
1020 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1509 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
1021 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break; 1510 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
1022 case 't': out = scanelf_file_textrel(elf, &found_textrel); break; 1511 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1023 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break; 1512 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
1024 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break; 1513 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1514 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1515 case 'D': out = get_endian(elf); break;
1516 case 'O': out = strfileperms(elf->filename); break;
1025 case 'n': 1517 case 'n':
1026 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break; 1518 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
1027 case 'i': out = scanelf_file_interp(elf, &found_interp); break; 1519 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1028 case 'b': out = scanelf_file_bind(elf, &found_bind); break; 1520 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1029 case 'S': out = scanelf_file_soname(elf, &found_soname); break; 1521 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
1030 case 's': out = scanelf_file_sym(elf, &found_sym); break; 1522 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1031 case 'k': out = scanelf_file_sections(elf, &found_section); break; 1523 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1524 case 'a': out = get_elfemtype(elf); break;
1525 case 'I': out = get_elfosabi(elf); break;
1526 case 'Y': out = get_elf_eabi(elf); break;
1527 case 'Z': snprintf(ubuf, sizeof(ubuf), "%lu", (unsigned long)elf->len); out = ubuf; break;;
1032 default: warnf("'%c' has no scan code?", out_format[i]); 1528 default: warnf("'%c' has no scan code?", out_format[i]);
1033 } 1529 }
1034 if (out) { 1530 if (out)
1035 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
1036 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
1037 xstrncat(&out_buffer, out, &out_len, (tmp-out));
1038 else
1039 xstrcat(&out_buffer, out, &out_len); 1531 xstrcat(&out_buffer, out, &out_len);
1040 }
1041 } 1532 }
1042 1533
1043#define FOUND_SOMETHING() \ 1534#define FOUND_SOMETHING() \
1044 (found_pax || found_phdr || found_relro || found_load || found_textrel || \ 1535 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1045 found_rpath || found_needed || found_interp || found_bind || \ 1536 found_rpath || found_needed || found_interp || found_bind || \
1064 elfobj *elf; 1555 elfobj *elf;
1065 1556
1066 /* verify this is real ELF */ 1557 /* verify this is real ELF */
1067 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) { 1558 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1068 if (be_verbose > 2) printf("%s: not an ELF\n", filename); 1559 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1069 return ret; 1560 return 2;
1070 } 1561 }
1071 switch (match_bits) { 1562 switch (match_bits) {
1072 case 32: 1563 case 32:
1073 if (elf->elf_class != ELFCLASS32) 1564 if (elf->elf_class != ELFCLASS32)
1074 goto label_done; 1565 goto label_done;
1077 if (elf->elf_class != ELFCLASS64) 1568 if (elf->elf_class != ELFCLASS64)
1078 goto label_done; 1569 goto label_done;
1079 break; 1570 break;
1080 default: break; 1571 default: break;
1081 } 1572 }
1082 if (strlen(match_etypes)) { 1573 if (match_etypes) {
1083 char sbuf[126]; 1574 char sbuf[126];
1084 strncpy(sbuf, match_etypes, sizeof(sbuf)); 1575 strncpy(sbuf, match_etypes, sizeof(sbuf));
1085 if (strchr(match_etypes, ',') != NULL) { 1576 if (strchr(match_etypes, ',') != NULL) {
1086 char *p; 1577 char *p;
1087 while((p = strrchr(sbuf, ',')) != NULL) { 1578 while ((p = strrchr(sbuf, ',')) != NULL) {
1088 *p = 0; 1579 *p = 0;
1089 if (atoi(p+1) == get_etype(elf)) 1580 if (etype_lookup(p+1) == get_etype(elf))
1090 goto label_ret; 1581 goto label_ret;
1091 } 1582 }
1092 } 1583 }
1093 if (atoi(sbuf) != get_etype(elf)) 1584 if (etype_lookup(sbuf) != get_etype(elf))
1094 goto label_done; 1585 goto label_done;
1095 } 1586 }
1096 1587
1097label_ret: 1588label_ret:
1098 ret = scanelf_elfobj(elf); 1589 ret = scanelf_elfobj(elf);
1112 1603
1113 ar = ar_open_fd(filename, fd); 1604 ar = ar_open_fd(filename, fd);
1114 if (ar == NULL) 1605 if (ar == NULL)
1115 return 1; 1606 return 1;
1116 1607
1117 ar_buffer = (char*)mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0); 1608 ar_buffer = mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1118 while ((m=ar_next(ar)) != NULL) { 1609 while ((m = ar_next(ar)) != NULL) {
1610 off_t cur_pos = lseek(fd, 0, SEEK_CUR);
1611 if (cur_pos == -1)
1612 errp("lseek() failed");
1119 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size); 1613 elf = readelf_buffer(m->name, ar_buffer + cur_pos, m->size);
1120 if (elf) { 1614 if (elf) {
1121 scanelf_elfobj(elf); 1615 scanelf_elfobj(elf);
1122 unreadelf(elf); 1616 unreadelf(elf);
1123 } 1617 }
1124 } 1618 }
1125 munmap(ar_buffer, len); 1619 munmap(ar_buffer, len);
1126 1620
1127 return 0; 1621 return 0;
1128} 1622}
1129/* scan a file which may be an elf or an archive or some other magical beast */ 1623/* scan a file which may be an elf or an archive or some other magical beast */
1130static void scanelf_file(const char *filename) 1624static int scanelf_fileat(int dir_fd, const char *filename, const struct stat *st_cache)
1131{ 1625{
1626 const struct stat *st = st_cache;
1132 struct stat st; 1627 struct stat symlink_st;
1133 int fd; 1628 int fd;
1134 1629
1135 /* make sure 'filename' exists */
1136 if (lstat(filename, &st) == -1) {
1137 if (be_verbose > 2) printf("%s: does not exist\n", filename);
1138 return;
1139 }
1140
1141 /* always handle regular files and handle symlinked files if no -y */ 1630 /* always handle regular files and handle symlinked files if no -y */
1142 if (S_ISLNK(st.st_mode)) { 1631 if (S_ISLNK(st->st_mode)) {
1143 if (!scan_symlink) return; 1632 if (!scan_symlink)
1144 stat(filename, &st); 1633 return 1;
1634 fstatat(dir_fd, filename, &symlink_st, 0);
1635 st = &symlink_st;
1145 } 1636 }
1637
1146 if (!S_ISREG(st.st_mode)) { 1638 if (!S_ISREG(st->st_mode)) {
1147 if (be_verbose > 2) printf("%s: skipping non-file\n", filename); 1639 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1148 return; 1640 return 1;
1149 } 1641 }
1150 1642
1151 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1) 1643 if (match_perms) {
1644 if ((st->st_mode | match_perms) != st->st_mode)
1645 return 1;
1646 }
1647 fd = openat(dir_fd, filename, (fix_elf ? O_RDWR : O_RDONLY) | O_CLOEXEC);
1648 if (fd == -1)
1152 return; 1649 return 1;
1153 1650
1154 if (scanelf_elf(filename, fd, st.st_size) == 1 && scan_archives) 1651 if (scanelf_elf(filename, fd, st->st_size) == 2) {
1155 /* if it isn't an ELF, maybe it's an .a archive */ 1652 /* if it isn't an ELF, maybe it's an .a archive */
1653 if (scan_archives)
1156 scanelf_archive(filename, fd, st.st_size); 1654 scanelf_archive(filename, fd, st->st_size);
1157 1655
1656 /*
1657 * unreadelf() implicitly closes its fd, so only close it
1658 * when we are returning it in the non-ELF case
1659 */
1158 close(fd); 1660 close(fd);
1661 }
1662
1663 return 0;
1159} 1664}
1160 1665
1161/* scan a directory for ET_EXEC files and print when we find one */ 1666/* scan a directory for ET_EXEC files and print when we find one */
1162static void scanelf_dir(const char *path) 1667static int scanelf_dirat(int dir_fd, const char *path)
1163{ 1668{
1164 register DIR *dir; 1669 register DIR *dir;
1165 register struct dirent *dentry; 1670 register struct dirent *dentry;
1166 struct stat st_top, st; 1671 struct stat st_top, st;
1167 char buf[__PAX_UTILS_PATH_MAX]; 1672 char buf[__PAX_UTILS_PATH_MAX], *subpath;
1168 size_t pathlen = 0, len = 0; 1673 size_t pathlen = 0, len = 0;
1674 int ret = 0;
1675 int subdir_fd;
1169 1676
1170 /* make sure path exists */ 1677 /* make sure path exists */
1171 if (lstat(path, &st_top) == -1) { 1678 if (fstatat(dir_fd, path, &st_top, AT_SYMLINK_NOFOLLOW) == -1) {
1172 if (be_verbose > 2) printf("%s: does not exist\n", path); 1679 if (be_verbose > 2) printf("%s: does not exist\n", path);
1173 return; 1680 return 1;
1174 } 1681 }
1175 1682
1176 /* ok, if it isn't a directory, assume we can open it */ 1683 /* ok, if it isn't a directory, assume we can open it */
1177 if (!S_ISDIR(st_top.st_mode)) { 1684 if (!S_ISDIR(st_top.st_mode))
1178 scanelf_file(path); 1685 return scanelf_fileat(dir_fd, path, &st_top);
1179 return;
1180 }
1181 1686
1182 /* now scan the dir looking for fun stuff */ 1687 /* now scan the dir looking for fun stuff */
1183 if ((dir = opendir(path)) == NULL) { 1688 subdir_fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
1184 warnf("could not opendir %s: %s", path, strerror(errno)); 1689 if (subdir_fd == -1)
1690 dir = NULL;
1691 else
1692 dir = fdopendir(subdir_fd);
1693 if (dir == NULL) {
1694 if (subdir_fd != -1)
1695 close(subdir_fd);
1696 warnfp("could not opendir(%s)", path);
1185 return; 1697 return 1;
1186 } 1698 }
1187 if (be_verbose > 1) printf("%s: scanning dir\n", path); 1699 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1188 1700
1189 pathlen = strlen(path); 1701 subpath = stpcpy(buf, path);
1702 if (subpath[-1] != '/')
1703 *subpath++ = '/';
1704 pathlen = subpath - buf;
1190 while ((dentry = readdir(dir))) { 1705 while ((dentry = readdir(dir))) {
1191 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1706 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1192 continue; 1707 continue;
1708
1709 if (fstatat(subdir_fd, dentry->d_name, &st, AT_SYMLINK_NOFOLLOW) == -1)
1710 continue;
1711
1193 len = (pathlen + 1 + strlen(dentry->d_name) + 1); 1712 len = strlen(dentry->d_name);
1194 if (len >= sizeof(buf)) { 1713 if (len + pathlen + 1 >= sizeof(buf)) {
1195 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path, 1714 warnf("Skipping '%s%s': len > sizeof(buf); %zu > %zu\n",
1196 (unsigned long)len, (unsigned long)sizeof(buf)); 1715 path, dentry->d_name, len + pathlen + 1, sizeof(buf));
1197 continue; 1716 continue;
1198 } 1717 }
1199 sprintf(buf, "%s/%s", path, dentry->d_name); 1718 memcpy(subpath, dentry->d_name, len);
1200 if (lstat(buf, &st) != -1) { 1719 subpath[len] = '\0';
1720
1201 if (S_ISREG(st.st_mode)) 1721 if (S_ISREG(st.st_mode))
1202 scanelf_file(buf); 1722 ret = scanelf_fileat(dir_fd, buf, &st);
1203 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1723 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1204 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1724 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1205 scanelf_dir(buf); 1725 ret = scanelf_dirat(dir_fd, buf);
1206 }
1207 } 1726 }
1208 } 1727 }
1209 closedir(dir); 1728 closedir(dir);
1210}
1211 1729
1730 return ret;
1731}
1732static int scanelf_dir(const char *path)
1733{
1734 return scanelf_dirat(root_fd, root_rel_path(path));
1735}
1736
1212static int scanelf_from_file(char *filename) 1737static int scanelf_from_file(const char *filename)
1213{ 1738{
1214 FILE *fp = NULL; 1739 FILE *fp;
1215 char *p; 1740 char *p, *path;
1216 char path[__PAX_UTILS_PATH_MAX]; 1741 size_t len;
1742 int ret;
1217 1743
1218 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL)) 1744 if (strcmp(filename, "-") == 0)
1219 fp = stdin; 1745 fp = stdin;
1220 else if ((fp = fopen(filename, "r")) == NULL) 1746 else if ((fp = fopen(filename, "r")) == NULL)
1221 return 1; 1747 return 1;
1222 1748
1223 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) { 1749 path = NULL;
1750 len = 0;
1751 ret = 0;
1752 while (getline(&path, &len, fp) != -1) {
1224 if ((p = strchr(path, '\n')) != NULL) 1753 if ((p = strchr(path, '\n')) != NULL)
1225 *p = 0; 1754 *p = 0;
1226 search_path = path; 1755 search_path = path;
1227 scanelf_dir(path); 1756 ret = scanelf_dir(path);
1228 } 1757 }
1758 free(path);
1759
1229 if (fp != stdin) 1760 if (fp != stdin)
1230 fclose(fp); 1761 fclose(fp);
1762
1231 return 0; 1763 return ret;
1232} 1764}
1233 1765
1766#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1767
1234static int load_ld_so_conf(int i, const char *fname) 1768static int _load_ld_cache_config(const char *fname)
1235{ 1769{
1236 FILE *fp = NULL; 1770 FILE *fp = NULL;
1237 char *p; 1771 char *p, *path;
1238 char path[__PAX_UTILS_PATH_MAX]; 1772 size_t len;
1773 int curr_fd = -1;
1239 1774
1240 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths)) 1775 fp = fopenat_r(root_fd, root_rel_path(fname));
1776 if (fp == NULL)
1241 return i; 1777 return -1;
1242 1778
1243 if ((fp = fopen(fname, "r")) == NULL) 1779 path = NULL;
1244 return i; 1780 len = 0;
1245 1781 while (getline(&path, &len, fp) != -1) {
1246 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1247 if ((p = strrchr(path, '\r')) != NULL) 1782 if ((p = strrchr(path, '\r')) != NULL)
1248 *p = 0; 1783 *p = 0;
1249 if ((p = strchr(path, '\n')) != NULL) 1784 if ((p = strchr(path, '\n')) != NULL)
1250 *p = 0; 1785 *p = 0;
1251#ifdef HAVE_GLOB 1786
1252 // recursive includes of the same file will make this segfault. 1787 /* recursive includes of the same file will make this segfault. */
1253 if ((*path == 'i') && (strncmp(path, "include", 7) == 0) && isblank(path[7])) { 1788 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1254 glob64_t gl; 1789 glob_t gl;
1255 size_t x; 1790 size_t x;
1256 char gpath[__PAX_UTILS_PATH_MAX]; 1791 const char *gpath;
1257 1792
1258 gpath[sizeof(gpath)] = 0; 1793 /* re-use existing path buffer ... need to be creative */
1259
1260 if (path[8] != '/') 1794 if (path[8] != '/')
1261 snprintf(gpath, sizeof(gpath)-1, "/etc/%s", &path[8]); 1795 gpath = memcpy(path + 3, "/etc/", 5);
1262 else 1796 else
1263 strncpy(gpath, &path[8], sizeof(gpath)-1); 1797 gpath = path + 8;
1798 if (root_fd != AT_FDCWD) {
1799 if (curr_fd == -1) {
1800 curr_fd = open(".", O_RDONLY|O_CLOEXEC);
1801 if (fchdir(root_fd))
1802 errp("unable to change to root dir");
1803 }
1804 gpath = root_rel_path(gpath);
1805 }
1264 1806
1265 if ((glob64(gpath, 0, NULL, &gl)) == 0) { 1807 if (glob(gpath, 0, NULL, &gl) == 0) {
1266 for (x = 0; x < gl.gl_pathc; ++x) { 1808 for (x = 0; x < gl.gl_pathc; ++x) {
1267 /* try to avoid direct loops */ 1809 /* try to avoid direct loops */
1268 if (strcmp(gl.gl_pathv[x], fname) == 0) 1810 if (strcmp(gl.gl_pathv[x], fname) == 0)
1269 continue; 1811 continue;
1270 i = load_ld_so_conf(i, gl.gl_pathv[x]); 1812 _load_ld_cache_config(gl.gl_pathv[x]);
1271 if (i + 1 >= sizeof(ldpaths) / sizeof(*ldpaths)) {
1272 globfree64(&gl);
1273 return i;
1274 }
1275 } 1813 }
1276 globfree64 (&gl); 1814 globfree(&gl);
1815 }
1816
1817 /* failed globs are ignored by glibc */
1277 continue; 1818 continue;
1278 } else
1279 abort();
1280 } 1819 }
1281#endif 1820
1282 if (*path != '/') 1821 if (*path != '/')
1283 continue; 1822 continue;
1284 1823
1285 ldpaths[i++] = xstrdup(path); 1824 xarraypush_str(ldpaths, path);
1286
1287 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
1288 break;
1289 } 1825 }
1290 ldpaths[i] = NULL; 1826 free(path);
1291 1827
1292 fclose(fp); 1828 fclose(fp);
1829
1830 if (curr_fd != -1) {
1831 if (fchdir(curr_fd))
1832 /* don't care */;
1833 close(curr_fd);
1834 }
1835
1293 return i; 1836 return 0;
1837}
1838
1839#elif defined(__FreeBSD__) || defined(__DragonFly__)
1840
1841static int _load_ld_cache_config(const char *fname)
1842{
1843 FILE *fp = NULL;
1844 char *b = NULL, *p;
1845 struct elfhints_hdr hdr;
1846
1847 fp = fopenat_r(root_fd, root_rel_path(fname));
1848 if (fp == NULL)
1849 return -1;
1850
1851 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1852 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1853 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1854 {
1855 fclose(fp);
1856 return -1;
1857 }
1858
1859 b = xmalloc(hdr.dirlistlen + 1);
1860 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1861 fclose(fp);
1862 free(b);
1863 return -1;
1864 }
1865
1866 while ((p = strsep(&b, ":"))) {
1867 if (*p == '\0')
1868 continue;
1869 xarraypush_str(ldpaths, p);
1870 }
1871
1872 free(b);
1873 fclose(fp);
1874 return 0;
1875}
1876
1877#else
1878#ifdef __ELF__
1879#warning Cache config support not implemented for your target
1880#endif
1881static int _load_ld_cache_config(const char *fname)
1882{
1883 return 0;
1884}
1885#endif
1886
1887static void load_ld_cache_config(const char *fname)
1888{
1889 bool scan_l, scan_ul, scan_ull;
1890 size_t n;
1891 const char *ldpath;
1892
1893 _load_ld_cache_config(fname);
1894
1895 scan_l = scan_ul = scan_ull = false;
1896 if (array_cnt(ldpaths)) {
1897 array_for_each(ldpaths, n, ldpath) {
1898 if (!scan_l && !strcmp(ldpath, "/lib")) scan_l = true;
1899 if (!scan_ul && !strcmp(ldpath, "/usr/lib")) scan_ul = true;
1900 if (!scan_ull && !strcmp(ldpath, "/usr/local/lib")) scan_ull = true;
1901 }
1902 }
1903
1904 if (!scan_l) xarraypush_str(ldpaths, "/lib");
1905 if (!scan_ul) xarraypush_str(ldpaths, "/usr/lib");
1906 if (!scan_ull) xarraypush_str(ldpaths, "/usr/local/lib");
1294} 1907}
1295 1908
1296/* scan /etc/ld.so.conf for paths */ 1909/* scan /etc/ld.so.conf for paths */
1297static void scanelf_ldpath() 1910static void scanelf_ldpath(void)
1298{ 1911{
1299 char scan_l, scan_ul, scan_ull; 1912 size_t n;
1300 int i = 0; 1913 const char *ldpath;
1301 1914
1302 if (!ldpaths[0]) 1915 array_for_each(ldpaths, n, ldpath)
1303 err("Unable to load any paths from ld.so.conf");
1304
1305 scan_l = scan_ul = scan_ull = 0;
1306
1307 while (ldpaths[i]) {
1308 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
1309 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
1310 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
1311 scanelf_dir(ldpaths[i]); 1916 scanelf_dir(ldpath);
1312 ++i;
1313 }
1314
1315 if (!scan_l) scanelf_dir("/lib");
1316 if (!scan_ul) scanelf_dir("/usr/lib");
1317 if (!scan_ull) scanelf_dir("/usr/local/lib");
1318} 1917}
1319 1918
1320/* scan env PATH for paths */ 1919/* scan env PATH for paths */
1321static void scanelf_envpath() 1920static void scanelf_envpath(void)
1322{ 1921{
1323 char *path, *p; 1922 char *path, *p;
1324 1923
1325 path = getenv("PATH"); 1924 path = getenv("PATH");
1326 if (!path) 1925 if (!path)
1333 } 1932 }
1334 1933
1335 free(path); 1934 free(path);
1336} 1935}
1337 1936
1338/* usage / invocation handling functions */ 1937/* usage / invocation handling functions */ /* Free Flags: c d j u w G H J K P Q U W */
1339#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:BhV" 1938#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZCBhV"
1340#define a_argument required_argument 1939#define a_argument required_argument
1341static struct option const long_opts[] = { 1940static struct option const long_opts[] = {
1342 {"path", no_argument, NULL, 'p'}, 1941 {"path", no_argument, NULL, 'p'},
1343 {"ldpath", no_argument, NULL, 'l'}, 1942 {"ldpath", no_argument, NULL, 'l'},
1943 {"use-ldpath",no_argument, NULL, 129},
1944 {"root", a_argument, NULL, 128},
1344 {"recursive", no_argument, NULL, 'R'}, 1945 {"recursive", no_argument, NULL, 'R'},
1345 {"mount", no_argument, NULL, 'm'}, 1946 {"mount", no_argument, NULL, 'm'},
1346 {"symlink", no_argument, NULL, 'y'}, 1947 {"symlink", no_argument, NULL, 'y'},
1347 {"archives", no_argument, NULL, 'A'}, 1948 {"archives", no_argument, NULL, 'A'},
1348 {"ldcache", no_argument, NULL, 'L'}, 1949 {"ldcache", no_argument, NULL, 'L'},
1361 {"lib", a_argument, NULL, 'N'}, 1962 {"lib", a_argument, NULL, 'N'},
1362 {"gmatch", no_argument, NULL, 'g'}, 1963 {"gmatch", no_argument, NULL, 'g'},
1363 {"textrels", no_argument, NULL, 'T'}, 1964 {"textrels", no_argument, NULL, 'T'},
1364 {"etype", a_argument, NULL, 'E'}, 1965 {"etype", a_argument, NULL, 'E'},
1365 {"bits", a_argument, NULL, 'M'}, 1966 {"bits", a_argument, NULL, 'M'},
1967 {"endian", no_argument, NULL, 'D'},
1968 {"osabi", no_argument, NULL, 'I'},
1969 {"eabi", no_argument, NULL, 'Y'},
1970 {"perms", a_argument, NULL, 'O'},
1971 {"size", no_argument, NULL, 'Z'},
1366 {"all", no_argument, NULL, 'a'}, 1972 {"all", no_argument, NULL, 'a'},
1367 {"quiet", no_argument, NULL, 'q'}, 1973 {"quiet", no_argument, NULL, 'q'},
1368 {"verbose", no_argument, NULL, 'v'}, 1974 {"verbose", no_argument, NULL, 'v'},
1369 {"format", a_argument, NULL, 'F'}, 1975 {"format", a_argument, NULL, 'F'},
1370 {"from", a_argument, NULL, 'f'}, 1976 {"from", a_argument, NULL, 'f'},
1371 {"file", a_argument, NULL, 'o'}, 1977 {"file", a_argument, NULL, 'o'},
1978 {"nocolor", no_argument, NULL, 'C'},
1372 {"nobanner", no_argument, NULL, 'B'}, 1979 {"nobanner", no_argument, NULL, 'B'},
1373 {"help", no_argument, NULL, 'h'}, 1980 {"help", no_argument, NULL, 'h'},
1374 {"version", no_argument, NULL, 'V'}, 1981 {"version", no_argument, NULL, 'V'},
1375 {NULL, no_argument, NULL, 0x0} 1982 {NULL, no_argument, NULL, 0x0}
1376}; 1983};
1377 1984
1378static const char *opts_help[] = { 1985static const char * const opts_help[] = {
1379 "Scan all directories in PATH environment", 1986 "Scan all directories in PATH environment",
1380 "Scan all directories in /etc/ld.so.conf", 1987 "Scan all directories in /etc/ld.so.conf",
1988 "Use ld.so.conf to show full path (use with -r/-n)",
1989 "Root directory (use with -l or -p)",
1381 "Scan directories recursively", 1990 "Scan directories recursively",
1382 "Don't recursively cross mount points", 1991 "Don't recursively cross mount points",
1383 "Don't scan symlinks", 1992 "Don't scan symlinks",
1384 "Scan archives (.a files)", 1993 "Scan archives (.a files)",
1385 "Utilize ld.so.cache information (use with -r/-n)", 1994 "Utilize ld.so.cache to show full path (use with -r/-n)",
1386 "Try and 'fix' bad things (use with -r/-e)", 1995 "Try and 'fix' bad things (use with -r/-e)",
1387 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n", 1996 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1388 "Print PaX markings", 1997 "Print PaX markings",
1389 "Print GNU_STACK/PT_LOAD markings", 1998 "Print GNU_STACK/PT_LOAD markings",
1390 "Print TEXTREL information", 1999 "Print TEXTREL information",
1394 "Print BIND information", 2003 "Print BIND information",
1395 "Print SONAME information", 2004 "Print SONAME information",
1396 "Find a specified symbol", 2005 "Find a specified symbol",
1397 "Find a specified section", 2006 "Find a specified section",
1398 "Find a specified library", 2007 "Find a specified library",
1399 "Use strncmp to match libraries. (use with -N)", 2008 "Use regex matching rather than string compare (use with -s)",
1400 "Locate cause of TEXTREL", 2009 "Locate cause of TEXTREL",
1401 "Print only ELF files matching numeric constant type", 2010 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1402 "Print only ELF files matching numeric bits", 2011 "Print only ELF files matching numeric bits",
1403 "Print all scanned info (-x -e -t -r -b)\n", 2012 "Print Endianness",
2013 "Print OSABI",
2014 "Print EABI (EM_ARM Only)",
2015 "Print only ELF files matching octal permissions",
2016 "Print ELF file size",
2017 "Print all useful/simple info\n",
1404 "Only output 'bad' things", 2018 "Only output 'bad' things",
1405 "Be verbose (can be specified more than once)", 2019 "Be verbose (can be specified more than once)",
1406 "Use specified format for output", 2020 "Use specified format for output",
1407 "Read input stream from a filename", 2021 "Read input stream from a filename",
1408 "Write output stream to a filename", 2022 "Write output stream to a filename",
2023 "Don't emit color in output",
1409 "Don't display the header", 2024 "Don't display the header",
1410 "Print this help and exit", 2025 "Print this help and exit",
1411 "Print version and exit", 2026 "Print version and exit",
1412 NULL 2027 NULL
1413}; 2028};
1417{ 2032{
1418 unsigned long i; 2033 unsigned long i;
1419 printf("* Scan ELF binaries for stuff\n\n" 2034 printf("* Scan ELF binaries for stuff\n\n"
1420 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0); 2035 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1421 printf("Options: -[%s]\n", PARSE_FLAGS); 2036 printf("Options: -[%s]\n", PARSE_FLAGS);
1422 for (i = 0; long_opts[i].name; ++i) 2037 for (i = 0; long_opts[i].name; ++i) {
2038 /* first output the short flag if it has one */
2039 if (long_opts[i].val > '~')
2040 printf(" ");
2041 else
2042 printf(" -%c, ", long_opts[i].val);
2043
2044 /* then the long flag */
1423 if (long_opts[i].has_arg == no_argument) 2045 if (long_opts[i].has_arg == no_argument)
1424 printf(" -%c, --%-14s* %s\n", long_opts[i].val, 2046 printf("--%-14s", long_opts[i].name);
1425 long_opts[i].name, opts_help[i]);
1426 else 2047 else
1427 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val, 2048 printf("--%-7s <arg> ", long_opts[i].name);
1428 long_opts[i].name, opts_help[i]);
1429 2049
1430 if (status != EXIT_SUCCESS) 2050 /* finally the help text */
1431 exit(status); 2051 printf("* %s\n", opts_help[i]);
1432 2052 }
1433 puts("\nThe format modifiers for the -F option are:");
1434 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1435 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1436 puts(" i INTERP \tb BIND \ts symbol");
1437 puts(" N library \to Type \tT TEXTRELs");
1438 puts(" S SONAME \tk section");
1439 puts(" p filename (with search path removed)");
1440 puts(" f filename (short name/basename)");
1441 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1442 2053
1443 puts("\nELF Etypes:"); 2054 puts("\nFor more information, see the scanelf(1) manpage");
1444 print_etypes(stdout);
1445
1446 exit(status); 2055 exit(status);
1447} 2056}
1448 2057
1449/* parse command line arguments and preform needed actions */ 2058/* parse command line arguments and preform needed actions */
2059#define do_pax_state(option, flag) \
2060 if (islower(option)) { \
2061 flags &= ~PF_##flag; \
2062 flags |= PF_NO##flag; \
2063 } else { \
2064 flags &= ~PF_NO##flag; \
2065 flags |= PF_##flag; \
2066 }
1450static void parseargs(int argc, char *argv[]) 2067static int parseargs(int argc, char *argv[])
1451{ 2068{
1452 int i; 2069 int i;
1453 char *from_file = NULL; 2070 const char *from_file = NULL;
2071 int ret = 0;
2072 char load_cache_config = 0;
1454 2073
1455 opterr = 0; 2074 opterr = 0;
1456 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 2075 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1457 switch (i) { 2076 switch (i) {
1458 2077
1466 case 'f': 2085 case 'f':
1467 if (from_file) warn("You prob don't want to specify -f twice"); 2086 if (from_file) warn("You prob don't want to specify -f twice");
1468 from_file = optarg; 2087 from_file = optarg;
1469 break; 2088 break;
1470 case 'E': 2089 case 'E':
1471 strncpy(match_etypes, optarg, sizeof(match_etypes)); 2090 match_etypes = optarg;
1472 break; 2091 break;
1473 case 'M': 2092 case 'M':
1474 match_bits = atoi(optarg); 2093 match_bits = atoi(optarg);
2094 if (match_bits == 0) {
2095 if (strcmp(optarg, "ELFCLASS32") == 0)
2096 match_bits = 32;
2097 if (strcmp(optarg, "ELFCLASS64") == 0)
2098 match_bits = 64;
2099 }
2100 break;
2101 case 'O':
2102 if (sscanf(optarg, "%o", &match_perms) == -1)
2103 match_bits = 0;
1475 break; 2104 break;
1476 case 'o': { 2105 case 'o': {
1477 FILE *fp = NULL;
1478 if ((fp = freopen(optarg, "w", stdout)) == NULL) 2106 if (freopen(optarg, "w", stdout) == NULL)
1479 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 2107 errp("Could not freopen(%s)", optarg);
1480 SET_STDOUT(fp);
1481 break; 2108 break;
1482 } 2109 }
1483 case 'k': 2110 case 'k':
1484 if (find_section) warn("You prob don't want to specify -k twice"); 2111 xarraypush_str(find_section_arr, optarg);
1485 find_section = optarg;
1486 break; 2112 break;
1487 case 's': { 2113 case 's': {
1488 if (find_sym) warn("You prob don't want to specify -s twice"); 2114 if (find_sym) warn("You prob don't want to specify -s twice");
1489 find_sym = optarg; 2115 find_sym = optarg;
1490 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1491 sprintf(versioned_symname, "%s@", find_sym);
1492 break; 2116 break;
1493 } 2117 }
1494 case 'N': { 2118 case 'N':
1495 if (find_lib) warn("You prob don't want to specify -N twice"); 2119 xarraypush_str(find_lib_arr, optarg);
1496 find_lib = optarg;
1497 break; 2120 break;
1498 }
1499
1500 case 'F': { 2121 case 'F': {
1501 if (out_format) warn("You prob don't want to specify -F twice"); 2122 if (out_format) warn("You prob don't want to specify -F twice");
1502 out_format = optarg; 2123 out_format = optarg;
1503 break; 2124 break;
1504 } 2125 }
1505 case 'z': { 2126 case 'z': {
1506 unsigned long flags = 10240; 2127 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1507 size_t x; 2128 size_t x;
1508 2129
1509#define do_state(option, flag) \
1510 if (islower(option)) { \
1511 flags &= ~PF_##flag; \
1512 flags |= PF_NO##flag; \
1513 } else { \
1514 flags &= ~PF_NO##flag; \
1515 flags |= PF_##flag; \
1516 }
1517
1518 for (x = 0 ; x < strlen(optarg); x++) { 2130 for (x = 0; x < strlen(optarg); x++) {
1519 switch(optarg[x]) { 2131 switch (optarg[x]) {
1520 case 'p': 2132 case 'p':
1521 case 'P': 2133 case 'P':
1522 do_state(optarg[x], PAGEEXEC); 2134 do_pax_state(optarg[x], PAGEEXEC);
1523 break; 2135 break;
1524 case 's': 2136 case 's':
1525 case 'S': 2137 case 'S':
1526 do_state(optarg[x], SEGMEXEC); 2138 do_pax_state(optarg[x], SEGMEXEC);
1527 break; 2139 break;
1528 case 'm': 2140 case 'm':
1529 case 'M': 2141 case 'M':
1530 do_state(optarg[x], MPROTECT); 2142 do_pax_state(optarg[x], MPROTECT);
1531 break; 2143 break;
1532 case 'e': 2144 case 'e':
1533 case 'E': 2145 case 'E':
1534 do_state(optarg[x], EMUTRAMP); 2146 do_pax_state(optarg[x], EMUTRAMP);
1535 break; 2147 break;
1536 case 'r': 2148 case 'r':
1537 case 'R': 2149 case 'R':
1538 do_state(optarg[x], RANDMMAP); 2150 do_pax_state(optarg[x], RANDMMAP);
1539 break; 2151 break;
1540 case 'x': 2152 case 'x':
1541 case 'X': 2153 case 'X':
1542 do_state(optarg[x], RANDEXEC); 2154 do_pax_state(optarg[x], RANDEXEC);
1543 break; 2155 break;
1544 default: 2156 default:
1545 break; 2157 break;
1546 } 2158 }
1547 } 2159 }
1552 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) || 2164 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1553 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)))) 2165 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1554 setpax = flags; 2166 setpax = flags;
1555 break; 2167 break;
1556 } 2168 }
2169 case 'Z': show_size = 1; break;
1557 case 'g': gmatch = 1; break; 2170 case 'g': g_match = 1; break;
1558 case 'L': use_ldcache = 1; break; 2171 case 'L': load_cache_config = use_ldcache = 1; break;
1559 case 'y': scan_symlink = 0; break; 2172 case 'y': scan_symlink = 0; break;
1560 case 'A': scan_archives = 1; break; 2173 case 'A': scan_archives = 1; break;
2174 case 'C': color_init(true); break;
1561 case 'B': show_banner = 0; break; 2175 case 'B': show_banner = 0; break;
1562 case 'l': scan_ldpath = 1; break; 2176 case 'l': load_cache_config = scan_ldpath = 1; break;
1563 case 'p': scan_envpath = 1; break; 2177 case 'p': scan_envpath = 1; break;
1564 case 'R': dir_recurse = 1; break; 2178 case 'R': dir_recurse = 1; break;
1565 case 'm': dir_crossmount = 0; break; 2179 case 'm': dir_crossmount = 0; break;
1566 case 'X': ++fix_elf; break; 2180 case 'X': ++fix_elf; break;
1567 case 'x': show_pax = 1; break; 2181 case 'x': show_pax = 1; break;
1573 case 'b': show_bind = 1; break; 2187 case 'b': show_bind = 1; break;
1574 case 'S': show_soname = 1; break; 2188 case 'S': show_soname = 1; break;
1575 case 'T': show_textrels = 1; break; 2189 case 'T': show_textrels = 1; break;
1576 case 'q': be_quiet = 1; break; 2190 case 'q': be_quiet = 1; break;
1577 case 'v': be_verbose = (be_verbose % 20) + 1; break; 2191 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1578 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break; 2192 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
1579 2193 case 'D': show_endian = 1; break;
2194 case 'I': show_osabi = 1; break;
2195 case 'Y': show_eabi = 1; break;
2196 case 128:
2197 root_fd = open(optarg, O_RDONLY|O_CLOEXEC);
2198 if (root_fd == -1)
2199 err("Could not open root: %s", optarg);
2200 break;
2201 case 129: load_cache_config = use_ldpath = 1; break;
1580 case ':': 2202 case ':':
1581 err("Option '%c' is missing parameter", optopt); 2203 err("Option '%c' is missing parameter", optopt);
1582 case '?': 2204 case '?':
1583 err("Unknown option '%c' or argument missing", optopt); 2205 err("Unknown option '%c' or argument missing", optopt);
1584 default: 2206 default:
1585 err("Unhandled option '%c'; please report this", i); 2207 err("Unhandled option '%c'; please report this", i);
1586 } 2208 }
1587 } 2209 }
1588 2210 if (show_textrels && be_verbose)
2211 has_objdump = bin_in_path("objdump");
2212 /* flatten arrays for display */
2213 if (array_cnt(find_lib_arr))
2214 find_lib = array_flatten_str(find_lib_arr);
2215 if (array_cnt(find_section_arr))
2216 find_section = array_flatten_str(find_section_arr);
1589 /* let the format option override all other options */ 2217 /* let the format option override all other options */
1590 if (out_format) { 2218 if (out_format) {
1591 show_pax = show_phdr = show_textrel = show_rpath = \ 2219 show_pax = show_phdr = show_textrel = show_rpath = \
1592 show_needed = show_interp = show_bind = show_soname = \ 2220 show_needed = show_interp = show_bind = show_soname = \
1593 show_textrels = 0; 2221 show_textrels = show_perms = show_endian = show_size = \
2222 show_osabi = show_eabi = 0;
1594 for (i = 0; out_format[i]; ++i) { 2223 for (i = 0; out_format[i]; ++i) {
1595 if (!IS_MODIFIER(out_format[i])) continue; 2224 if (!IS_MODIFIER(out_format[i])) continue;
1596 2225
1597 switch (out_format[++i]) { 2226 switch (out_format[++i]) {
2227 case '+': break;
1598 case '%': break; 2228 case '%': break;
1599 case '#': break; 2229 case '#': break;
1600 case 'F': break; 2230 case 'F': break;
1601 case 'p': break; 2231 case 'p': break;
1602 case 'f': break; 2232 case 'f': break;
1603 case 'k': break; 2233 case 'k': break;
1604 case 's': break; 2234 case 's': break;
1605 case 'N': break; 2235 case 'N': break;
1606 case 'o': break; 2236 case 'o': break;
2237 case 'a': break;
2238 case 'M': break;
2239 case 'Z': show_size = 1; break;
2240 case 'D': show_endian = 1; break;
2241 case 'I': show_osabi = 1; break;
2242 case 'Y': show_eabi = 1; break;
2243 case 'O': show_perms = 1; break;
1607 case 'x': show_pax = 1; break; 2244 case 'x': show_pax = 1; break;
1608 case 'e': show_phdr = 1; break; 2245 case 'e': show_phdr = 1; break;
1609 case 't': show_textrel = 1; break; 2246 case 't': show_textrel = 1; break;
1610 case 'r': show_rpath = 1; break; 2247 case 'r': show_rpath = 1; break;
1611 case 'n': show_needed = 1; break; 2248 case 'n': show_needed = 1; break;
1612 case 'i': show_interp = 1; break; 2249 case 'i': show_interp = 1; break;
1613 case 'b': show_bind = 1; break; 2250 case 'b': show_bind = 1; break;
1614 case 'S': show_soname = 1; break; 2251 case 'S': show_soname = 1; break;
1615 case 'T': show_textrels = 1; break; 2252 case 'T': show_textrels = 1; break;
1616 default: 2253 default:
1617 err("Invalid format specifier '%c' (byte %i)", 2254 err("invalid format specifier '%c' (byte %i)",
1618 out_format[i], i+1); 2255 out_format[i], i+1);
1619 } 2256 }
1620 } 2257 }
1621 2258
1622 /* construct our default format */ 2259 /* construct our default format */
1623 } else { 2260 } else {
1624 size_t fmt_len = 30; 2261 size_t fmt_len = 30;
1625 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 2262 out_format = xmalloc(sizeof(char) * fmt_len);
2263 *out_format = '\0';
1626 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 2264 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1627 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len); 2265 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
2266 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
2267 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
2268 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
2269 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
2270 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
1628 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len); 2271 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1629 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 2272 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1630 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 2273 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1631 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 2274 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1632 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 2275 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1639 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 2282 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1640 } 2283 }
1641 if (be_verbose > 2) printf("Format: %s\n", out_format); 2284 if (be_verbose > 2) printf("Format: %s\n", out_format);
1642 2285
1643 /* now lets actually do the scanning */ 2286 /* now lets actually do the scanning */
1644 if (scan_ldpath || use_ldcache) 2287 if (load_cache_config)
1645 load_ld_so_conf(0, "/etc/ld.so.conf"); 2288 load_ld_cache_config(__PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
1646 if (scan_ldpath) scanelf_ldpath(); 2289 if (scan_ldpath) scanelf_ldpath();
1647 if (scan_envpath) scanelf_envpath(); 2290 if (scan_envpath) scanelf_envpath();
2291 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
2292 from_file = "-";
1648 if (from_file) { 2293 if (from_file) {
1649 scanelf_from_file(from_file); 2294 scanelf_from_file(from_file);
1650 from_file = *argv; 2295 from_file = *argv;
1651 } 2296 }
1652 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file) 2297 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1653 err("Nothing to scan !?"); 2298 err("Nothing to scan !?");
1654 while (optind < argc) { 2299 while (optind < argc) {
1655 search_path = argv[optind++]; 2300 search_path = argv[optind++];
1656 scanelf_dir(search_path); 2301 ret = scanelf_dir(search_path);
1657 } 2302 }
1658 2303
1659 /* clean up */ 2304 /* clean up */
1660 if (versioned_symname) free(versioned_symname);
1661 for (i = 0; ldpaths[i]; ++i)
1662 free(ldpaths[i]); 2305 xarrayfree(ldpaths);
2306 xarrayfree(find_lib_arr);
2307 xarrayfree(find_section_arr);
2308 free(find_lib);
2309 free(find_section);
1663 2310
1664 if (ldcache != 0) 2311 if (ldcache != 0)
1665 munmap(ldcache, ldcache_size); 2312 munmap(ldcache, ldcache_size);
1666}
1667
1668
1669
1670/* utility funcs */
1671static char *xstrdup(const char *s)
1672{
1673 char *ret = strdup(s);
1674 if (!ret) err("Could not strdup(): %s", strerror(errno));
1675 return ret; 2313 return ret;
1676} 2314}
1677static void *xmalloc(size_t size)
1678{
1679 void *ret = malloc(size);
1680 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1681 return ret;
1682}
1683static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
1684{
1685 size_t new_len;
1686 2315
1687 new_len = strlen(*dst) + strlen(src); 2316static char **get_split_env(const char *envvar)
1688 if (*curr_len <= new_len) {
1689 *curr_len = new_len + (*curr_len / 2);
1690 *dst = realloc(*dst, *curr_len);
1691 if (!*dst)
1692 err("could not realloc() %li bytes", (unsigned long)*curr_len);
1693 }
1694
1695 if (n)
1696 strncat(*dst, src, n);
1697 else
1698 strcat(*dst, src);
1699}
1700static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1701{ 2317{
1702 static char my_app[2]; 2318 const char *delims = " \t\n";
1703 my_app[0] = append; 2319 char **envvals = NULL;
1704 my_app[1] = '\0'; 2320 char *env, *s;
1705 xstrcat(dst, my_app, curr_len); 2321 int nentry;
1706}
1707 2322
2323 if ((env = getenv(envvar)) == NULL)
2324 return NULL;
1708 2325
2326 env = xstrdup(env);
2327 if (env == NULL)
2328 return NULL;
2329
2330 s = strtok(env, delims);
2331 if (s == NULL) {
2332 free(env);
2333 return NULL;
2334 }
2335
2336 nentry = 0;
2337 while (s != NULL) {
2338 ++nentry;
2339 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
2340 envvals[nentry-1] = s;
2341 s = strtok(NULL, delims);
2342 }
2343 envvals[nentry] = NULL;
2344
2345 /* don't want to free(env) as it contains the memory that backs
2346 * the envvals array of strings */
2347 return envvals;
2348}
2349
2350static void parseenv(void)
2351{
2352 color_init(false);
2353 qa_textrels = get_split_env("QA_TEXTRELS");
2354 qa_execstack = get_split_env("QA_EXECSTACK");
2355 qa_wx_load = get_split_env("QA_WX_LOAD");
2356}
2357
2358#ifdef __PAX_UTILS_CLEANUP
2359static void cleanup(void)
2360{
2361 free(out_format);
2362 free(qa_textrels);
2363 free(qa_execstack);
2364 free(qa_wx_load);
2365}
2366#endif
1709 2367
1710int main(int argc, char *argv[]) 2368int main(int argc, char *argv[])
1711{ 2369{
2370 int ret;
1712 if (argc < 2) 2371 if (argc < 2)
1713 usage(EXIT_FAILURE); 2372 usage(EXIT_FAILURE);
2373 parseenv();
1714 parseargs(argc, argv); 2374 ret = parseargs(argc, argv);
1715 fclose(stdout); 2375 fclose(stdout);
1716#ifdef __BOUNDS_CHECKING_ON 2376#ifdef __PAX_UTILS_CLEANUP
1717 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()"); 2377 cleanup();
2378 warn("The calls to add/delete heap should be off:\n"
2379 "\t- 1 due to the out_buffer not being freed in scanelf_fileat()\n"
2380 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
1718#endif 2381#endif
1719 return EXIT_SUCCESS; 2382 return ret;
1720} 2383}
2384
2385/* Match filename against entries in matchlist, return TRUE
2386 * if the file is listed */
2387static int file_matches_list(const char *filename, char **matchlist)
2388{
2389 char **file;
2390 char *match;
2391 char buf[__PAX_UTILS_PATH_MAX];
2392
2393 if (matchlist == NULL)
2394 return 0;
2395
2396 for (file = matchlist; *file != NULL; file++) {
2397 if (search_path) {
2398 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2399 match = buf;
2400 } else {
2401 match = *file;
2402 }
2403 if (fnmatch(match, filename, 0) == 0)
2404 return 1;
2405 }
2406 return 0;
2407}

Legend:
Removed from v.1.127  
changed lines
  Added in v.1.243

  ViewVC Help
Powered by ViewVC 1.1.20