/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.96 Revision 1.236
1/* 1/*
2 * Copyright 2003-2005 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 1.96 2005/12/28 22:26:47 solar Exp $ 4 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.236 2011/12/21 17:34:12 vapier Exp $
5 * 5 *
6 * Copyright 2003-2005 Ned Ludd - <solar@gentoo.org> 6 * Copyright 2003-2007 Ned Ludd - <solar@gentoo.org>
7 * Copyright 2004-2005 Mike Frysinger - <vapier@gentoo.org> 7 * Copyright 2004-2007 Mike Frysinger - <vapier@gentoo.org>
8 */ 8 */
9 9
10#include <stdio.h> 10static const char rcsid[] = "$Id: scanelf.c,v 1.236 2011/12/21 17:34:12 vapier Exp $";
11#include <stdlib.h> 11const char argv0[] = "scanelf";
12#include <sys/types.h> 12
13#include <libgen.h>
14#include <limits.h>
15#include <string.h>
16#include <errno.h>
17#include <unistd.h>
18#include <sys/stat.h>
19#include <sys/mman.h>
20#include <fcntl.h>
21#include <dirent.h>
22#include <getopt.h>
23#include <assert.h>
24#include "paxinc.h" 13#include "paxinc.h"
25 14
26static const char *rcsid = "$Id: scanelf.c,v 1.96 2005/12/28 22:26:47 solar Exp $";
27#define argv0 "scanelf"
28
29#define IS_MODIFIER(c) (c == '%' || c == '#') 15#define IS_MODIFIER(c) (c == '%' || c == '#' || c == '+')
30
31
32 16
33/* prototypes */ 17/* prototypes */
34static void scanelf_file(const char *filename); 18static int file_matches_list(const char *filename, char **matchlist);
35static void scanelf_dir(const char *path);
36static void scanelf_ldpath();
37static void scanelf_envpath();
38static void usage(int status);
39static void parseargs(int argc, char *argv[]);
40static char *xstrdup(const char *s);
41static void *xmalloc(size_t size);
42static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n);
43#define xstrcat(dst,src,curr_len) xstrncat(dst,src,curr_len,0)
44static inline void xchrcat(char **dst, const char append, size_t *curr_len);
45 19
46/* variables to control behavior */ 20/* variables to control behavior */
47static char *ldpaths[256]; 21static char *match_etypes = NULL;
22static array_t _ldpaths = array_init_decl, *ldpaths = &_ldpaths;
48static char scan_ldpath = 0; 23static char scan_ldpath = 0;
49static char scan_envpath = 0; 24static char scan_envpath = 0;
50static char scan_symlink = 1; 25static char scan_symlink = 1;
26static char scan_archives = 0;
51static char dir_recurse = 0; 27static char dir_recurse = 0;
52static char dir_crossmount = 1; 28static char dir_crossmount = 1;
53static char show_pax = 0; 29static char show_pax = 0;
30static char show_perms = 0;
31static char show_size = 0;
54static char show_phdr = 0; 32static char show_phdr = 0;
55static char show_textrel = 0; 33static char show_textrel = 0;
56static char show_rpath = 0; 34static char show_rpath = 0;
57static char show_needed = 0; 35static char show_needed = 0;
58static char show_interp = 0; 36static char show_interp = 0;
59static char show_bind = 0; 37static char show_bind = 0;
60static char show_soname = 0; 38static char show_soname = 0;
61static char show_textrels = 0; 39static char show_textrels = 0;
62static char show_banner = 1; 40static char show_banner = 1;
41static char show_endian = 0;
42static char show_osabi = 0;
43static char show_eabi = 0;
63static char be_quiet = 0; 44static char be_quiet = 0;
64static char be_verbose = 0; 45static char be_verbose = 0;
65static char be_wewy_wewy_quiet = 0; 46static char be_wewy_wewy_quiet = 0;
66static char *find_sym = NULL, *versioned_symname = NULL; 47static char be_semi_verbose = 0;
48static char *find_sym = NULL;
67static char *find_lib = NULL; 49static char *find_lib = NULL;
50static array_t _find_lib_arr = array_init_decl, *find_lib_arr = &_find_lib_arr;
51static char *find_section = NULL;
52static array_t _find_section_arr = array_init_decl, *find_section_arr = &_find_section_arr;
68static char *out_format = NULL; 53static char *out_format = NULL;
69static char *search_path = NULL; 54static char *search_path = NULL;
55static char fix_elf = 0;
70static char gmatch = 0; 56static char g_match = 0;
71static char printcache = 0; 57static char use_ldcache = 0;
72 58
59static char **qa_textrels = NULL;
60static char **qa_execstack = NULL;
61static char **qa_wx_load = NULL;
62static int root_fd = AT_FDCWD;
73 63
74caddr_t ldcache = 0; 64static int match_bits = 0;
65static unsigned int match_perms = 0;
66static void *ldcache = NULL;
75size_t ldcache_size = 0; 67static size_t ldcache_size = 0;
68static unsigned long setpax = 0UL;
76 69
70static int has_objdump = 0;
71
72/* find the path to a file by name */
73static int bin_in_path(const char *fname)
74{
75 char fullpath[__PAX_UTILS_PATH_MAX];
76 char *path, *p;
77
78 path = getenv("PATH");
79 if (!path)
80 return 0;
81
82 while ((p = strrchr(path, ':')) != NULL) {
83 snprintf(fullpath, sizeof(fullpath), "%s/%s", p + 1, fname);
84 *p = 0;
85 if (access(fullpath, R_OK) != -1)
86 return 1;
87 }
88
89 return 0;
90}
91
92static FILE *fopenat_r(int dir_fd, const char *path)
93{
94 int fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
95 if (fd == -1)
96 return NULL;
97 return fdopen(fd, "re");
98}
99
100static const char *root_rel_path(const char *path)
101{
102 /*
103 * openat() will ignore the dirfd if path starts with
104 * a /, so consume all of that noise
105 *
106 * XXX: we don't handle relative paths like ../ that
107 * break out of the --root option, but for now, just
108 * don't do that :P.
109 */
110 if (root_fd != AT_FDCWD) {
111 while (*path == '/')
112 ++path;
113 if (*path == '\0')
114 path = ".";
115 }
116
117 return path;
118}
119
120/* 1 on failure. 0 otherwise */
121static int rematch(const char *regex, const char *match, int cflags)
122{
123 regex_t preg;
124 int ret;
125
126 if ((match == NULL) || (regex == NULL))
127 return EXIT_FAILURE;
128
129 if ((ret = regcomp(&preg, regex, cflags))) {
130 char err[256];
131
132 if (regerror(ret, &preg, err, sizeof(err)))
133 fprintf(stderr, "regcomp failed: %s", err);
134 else
135 fprintf(stderr, "regcomp failed");
136
137 return EXIT_FAILURE;
138 }
139 ret = regexec(&preg, match, 0, NULL, 0);
140 regfree(&preg);
141
142 return ret;
143}
144
77/* sub-funcs for scanelf_file() */ 145/* sub-funcs for scanelf_fileat() */
78static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab) 146static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **str)
79{ 147{
80 /* find the best SHT_DYNSYM and SHT_STRTAB sections */ 148 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
149
150 /* debug sections */
151 void *symtab = elf_findsecbyname(elf, ".symtab");
152 void *strtab = elf_findsecbyname(elf, ".strtab");
153 /* runtime sections */
154 void *dynsym = elf_findsecbyname(elf, ".dynsym");
155 void *dynstr = elf_findsecbyname(elf, ".dynstr");
156
81#define GET_SYMTABS(B) \ 157#define GET_SYMTABS(B) \
82 if (elf->elf_class == ELFCLASS ## B) { \ 158 if (elf->elf_class == ELFCLASS ## B) { \
83 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
84 /* debug sections */ \
85 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
86 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
87 /* runtime sections */ \
88 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
89 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
90 if (symtab && dynsym) { \ 159 if (symtab && dynsym) { \
160 Elf ## B ## _Shdr *esymtab = symtab; \
161 Elf ## B ## _Shdr *edynsym = dynsym; \
91 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \ 162 *sym = (EGET(esymtab->sh_size) > EGET(edynsym->sh_size)) ? symtab : dynsym; \
92 } else { \ 163 } else \
93 *sym = (void*)(symtab ? symtab : dynsym); \ 164 *sym = symtab ? symtab : dynsym; \
94 } \
95 if (strtab && dynstr) { \ 165 if (strtab && dynstr) { \
166 Elf ## B ## _Shdr *estrtab = strtab; \
167 Elf ## B ## _Shdr *edynstr = dynstr; \
96 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \ 168 *str = (EGET(estrtab->sh_size) > EGET(edynstr->sh_size)) ? strtab : dynstr; \
97 } else { \ 169 } else \
98 *tab = (void*)(strtab ? strtab : dynstr); \ 170 *str = strtab ? strtab : dynstr; \
99 } \
100 } 171 }
101 GET_SYMTABS(32) 172 GET_SYMTABS(32)
102 GET_SYMTABS(64) 173 GET_SYMTABS(64)
174
175 if (*sym && *str)
176 return;
177
178 /*
179 * damn, they're really going to make us work for it huh?
180 * reconstruct the section header info out of the dynamic
181 * tags so we can see what symbols this guy uses at runtime.
182 */
183#define GET_SYMTABS_DT(B) \
184 if (elf->elf_class == ELFCLASS ## B) { \
185 size_t i; \
186 static Elf ## B ## _Shdr sym_shdr, str_shdr; \
187 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
188 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
189 Elf ## B ## _Addr vsym, vstr, vhash, vgnu_hash; \
190 Elf ## B ## _Dyn *dyn; \
191 Elf ## B ## _Off offset; \
192 \
193 /* lookup symbols used at runtime with DT_SYMTAB / DT_STRTAB */ \
194 vsym = vstr = vhash = vgnu_hash = 0; \
195 memset(&sym_shdr, 0, sizeof(sym_shdr)); \
196 memset(&str_shdr, 0, sizeof(str_shdr)); \
197 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
198 if (EGET(phdr[i].p_type) != PT_DYNAMIC) \
199 continue; \
200 \
201 offset = EGET(phdr[i].p_offset); \
202 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
203 continue; \
204 \
205 dyn = DYN ## B (elf->vdata + offset); \
206 while (EGET(dyn->d_tag) != DT_NULL) { \
207 switch (EGET(dyn->d_tag)) { \
208 case DT_SYMTAB: vsym = EGET(dyn->d_un.d_val); break; \
209 case DT_SYMENT: sym_shdr.sh_entsize = dyn->d_un.d_val; break; \
210 case DT_STRTAB: vstr = EGET(dyn->d_un.d_val); break; \
211 case DT_STRSZ: str_shdr.sh_size = dyn->d_un.d_val; break; \
212 case DT_HASH: vhash = EGET(dyn->d_un.d_val); break; \
213 /*case DT_GNU_HASH: vgnu_hash = EGET(dyn->d_un.d_val); break;*/ \
214 } \
215 ++dyn; \
216 } \
217 if (vsym && vstr) \
218 break; \
219 } \
220 if (!vsym || !vstr || !(vhash || vgnu_hash)) \
221 return; \
222 \
223 /* calc offset into the ELF by finding the load addr of the syms */ \
224 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
225 Elf ## B ## _Addr vaddr = EGET(phdr[i].p_vaddr); \
226 Elf ## B ## _Addr filesz = EGET(phdr[i].p_filesz); \
227 offset = EGET(phdr[i].p_offset); \
228 \
229 if (EGET(phdr[i].p_type) != PT_LOAD) \
230 continue; \
231 \
232 if (vhash >= vaddr && vhash < vaddr + filesz) { \
233 /* Scan the hash table to see how many entries we have */ \
234 Elf32_Word max_sym_idx = 0; \
235 Elf32_Word *hashtbl = elf->vdata + offset + (vhash - vaddr); \
236 Elf32_Word b, nbuckets = EGET(hashtbl[0]); \
237 Elf32_Word nchains = EGET(hashtbl[1]); \
238 Elf32_Word *buckets = &hashtbl[2]; \
239 Elf32_Word *chains = &buckets[nbuckets]; \
240 Elf32_Word sym_idx; \
241 \
242 for (b = 0; b < nbuckets; ++b) { \
243 if (!buckets[b]) \
244 continue; \
245 for (sym_idx = buckets[b]; sym_idx < nchains && sym_idx; sym_idx = chains[sym_idx]) \
246 if (max_sym_idx < sym_idx) \
247 max_sym_idx = sym_idx; \
248 } \
249 ESET(sym_shdr.sh_size, sym_shdr.sh_entsize * max_sym_idx); \
250 } \
251 \
252 if (vsym >= vaddr && vsym < vaddr + filesz) { \
253 ESET(sym_shdr.sh_offset, offset + (vsym - vaddr)); \
254 *sym = &sym_shdr; \
255 } \
256 \
257 if (vstr >= vaddr && vstr < vaddr + filesz) { \
258 ESET(str_shdr.sh_offset, offset + (vstr - vaddr)); \
259 *str = &str_shdr; \
260 } \
261 } \
262 }
263 GET_SYMTABS_DT(32)
264 GET_SYMTABS_DT(64)
103} 265}
266
104static char *scanelf_file_pax(elfobj *elf, char *found_pax) 267static char *scanelf_file_pax(elfobj *elf, char *found_pax)
105{ 268{
106 static char ret[7]; 269 static char ret[7];
107 unsigned long i, shown; 270 unsigned long i, shown;
108 271
117 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 280 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
118 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 281 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
119 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 282 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
120 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \ 283 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
121 continue; \ 284 continue; \
122 if (be_quiet && (EGET(phdr[i].p_flags) == 10240)) \ 285 if (fix_elf && setpax) { \
286 /* set the paxctl flags */ \
287 ESET(phdr[i].p_flags, setpax); \
288 } \
289 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
123 continue; \ 290 continue; \
124 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \ 291 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
125 *found_pax = 1; \ 292 *found_pax = 1; \
126 ++shown; \ 293 ++shown; \
127 break; \ 294 break; \
128 } \ 295 } \
129 } 296 }
130 SHOW_PAX(32) 297 SHOW_PAX(32)
131 SHOW_PAX(64) 298 SHOW_PAX(64)
299 }
300
301 if (fix_elf && setpax) {
302 /* set the chpax settings */
303 if (elf->elf_class == ELFCLASS32) {
304 if (EHDR32(elf->ehdr)->e_type == ET_DYN || EHDR32(elf->ehdr)->e_type == ET_EXEC)
305 ESET(EHDR32(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
306 } else {
307 if (EHDR64(elf->ehdr)->e_type == ET_DYN || EHDR64(elf->ehdr)->e_type == ET_EXEC)
308 ESET(EHDR64(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
309 }
132 } 310 }
133 311
134 /* fall back to EI_PAX if no PT_PAX was found */ 312 /* fall back to EI_PAX if no PT_PAX was found */
135 if (!*ret) { 313 if (!*ret) {
136 static char *paxflags; 314 static char *paxflags;
150 328
151static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load) 329static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
152{ 330{
153 static char ret[12]; 331 static char ret[12];
154 char *found; 332 char *found;
155 unsigned long i, shown;
156 unsigned char multi_stack, multi_relro, multi_load; 333 unsigned long i, shown, multi_stack, multi_relro, multi_load;
334 int max_pt_load;
157 335
158 if (!show_phdr) return NULL; 336 if (!show_phdr) return NULL;
159 337
160 memcpy(ret, "--- --- ---\0", 12); 338 memcpy(ret, "--- --- ---\0", 12);
161 339
162 shown = 0; 340 shown = 0;
163 multi_stack = multi_relro = multi_load = 0; 341 multi_stack = multi_relro = multi_load = 0;
342 max_pt_load = elf_max_pt_load(elf);
164 343
344#define NOTE_GNU_STACK ".note.GNU-stack"
165#define SHOW_PHDR(B) \ 345#define SHOW_PHDR(B) \
166 if (elf->elf_class == ELFCLASS ## B) { \ 346 if (elf->elf_class == ELFCLASS ## B) { \
167 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 347 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
168 Elf ## B ## _Off offset; \ 348 Elf ## B ## _Off offset; \
169 uint32_t flags, check_flags; \ 349 uint32_t flags, check_flags; \
170 if (elf->phdr != NULL) { \ 350 if (elf->phdr != NULL) { \
171 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 351 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
172 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \ 352 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
173 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \ 353 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
354 if (multi_stack++) \
174 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \ 355 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
356 if (file_matches_list(elf->filename, qa_execstack)) \
357 continue; \
175 found = found_phdr; \ 358 found = found_phdr; \
176 offset = 0; \ 359 offset = 0; \
177 check_flags = PF_X; \ 360 check_flags = PF_X; \
178 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \ 361 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
362 if (multi_relro++) \
179 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \ 363 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
180 found = found_relro; \ 364 found = found_relro; \
181 offset = 4; \ 365 offset = 4; \
182 check_flags = PF_X; \ 366 check_flags = PF_X; \
183 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \ 367 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
184 if (multi_load++ > 2) warnf("%s: more than 2 PT_LOAD's !?", elf->filename); \ 368 if (EGET(ehdr->e_type) == ET_DYN || EGET(ehdr->e_type) == ET_EXEC) \
369 if (multi_load++ > max_pt_load) \
370 warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
371 if (file_matches_list(elf->filename, qa_wx_load)) \
372 continue; \
185 found = found_load; \ 373 found = found_load; \
186 offset = 8; \ 374 offset = 8; \
187 check_flags = PF_W|PF_X; \ 375 check_flags = PF_W|PF_X; \
188 } else \ 376 } else \
189 continue; \ 377 continue; \
190 flags = EGET(phdr[i].p_flags); \ 378 flags = EGET(phdr[i].p_flags); \
191 if (be_quiet && ((flags & check_flags) != check_flags)) \ 379 if (be_quiet && ((flags & check_flags) != check_flags)) \
192 continue; \ 380 continue; \
381 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
382 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
383 ret[3] = ret[7] = '!'; \
384 flags = EGET(phdr[i].p_flags); \
385 } \
193 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \ 386 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
194 *found = 1; \ 387 *found = 1; \
195 ++shown; \ 388 ++shown; \
196 } \ 389 } \
197 } else if (elf->shdr != NULL) { \ 390 } else if (elf->shdr != NULL) { \
198 /* no program headers which means this is prob an object file */ \ 391 /* no program headers which means this is prob an object file */ \
199 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \ 392 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
200 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \ 393 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
394 char *str; \
395 if ((void*)strtbl > elf->data_end) \
396 goto skip_this_shdr##B; \
201 check_flags = SHF_WRITE|SHF_EXECINSTR; \ 397 check_flags = SHF_WRITE|SHF_EXECINSTR; \
202 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \ 398 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
203 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \ 399 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
204 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \ 400 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
205 if (!strcmp((char*)(elf->data + offset), ".note.GNU-stack")) { \ 401 str = elf->data + offset; \
402 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
403 if (!strcmp(str, NOTE_GNU_STACK)) { \
206 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \ 404 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
207 flags = EGET(shdr[i].sh_flags); \ 405 flags = EGET(shdr[i].sh_flags); \
208 if (be_quiet && ((flags & check_flags) != check_flags)) \ 406 if (be_quiet && ((flags & check_flags) != check_flags)) \
209 continue; \ 407 continue; \
210 ++*found_phdr; \ 408 ++*found_phdr; \
214 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \ 412 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
215 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \ 413 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
216 break; \ 414 break; \
217 } \ 415 } \
218 } \ 416 } \
417 skip_this_shdr##B: \
219 if (!multi_stack) { \ 418 if (!multi_stack) { \
419 if (file_matches_list(elf->filename, qa_execstack)) \
420 return NULL; \
220 *found_phdr = 1; \ 421 *found_phdr = 1; \
221 shown = 1; \ 422 shown = 1; \
222 memcpy(ret, "!WX", 3); \ 423 memcpy(ret, "!WX", 3); \
223 } \ 424 } \
224 } \ 425 } \
229 if (be_wewy_wewy_quiet || (be_quiet && !shown)) 430 if (be_wewy_wewy_quiet || (be_quiet && !shown))
230 return NULL; 431 return NULL;
231 else 432 else
232 return ret; 433 return ret;
233} 434}
435
436/*
437 * See if this ELF contains a DT_TEXTREL tag in any of its
438 * PT_DYNAMIC sections.
439 */
234static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 440static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
235{ 441{
236 static const char *ret = "TEXTREL"; 442 static const char *ret = "TEXTREL";
237 unsigned long i; 443 unsigned long i;
238 444
239 if (!show_textrel && !show_textrels) return NULL; 445 if (!show_textrel && !show_textrels) return NULL;
446
447 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
240 448
241 if (elf->phdr) { 449 if (elf->phdr) {
242#define SHOW_TEXTREL(B) \ 450#define SHOW_TEXTREL(B) \
243 if (elf->elf_class == ELFCLASS ## B) { \ 451 if (elf->elf_class == ELFCLASS ## B) { \
244 Elf ## B ## _Dyn *dyn; \ 452 Elf ## B ## _Dyn *dyn; \
245 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 453 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
246 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 454 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
247 Elf ## B ## _Off offset; \ 455 Elf ## B ## _Off offset; \
248 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 456 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
249 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 457 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
250 offset = EGET(phdr[i].p_offset); \ 458 offset = EGET(phdr[i].p_offset); \
251 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 459 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
252 dyn = DYN ## B (elf->data + offset); \ 460 dyn = DYN ## B (elf->vdata + offset); \
253 while (EGET(dyn->d_tag) != DT_NULL) { \ 461 while (EGET(dyn->d_tag) != DT_NULL) { \
254 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \ 462 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
255 *found_textrel = 1; \ 463 *found_textrel = 1; \
256 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \ 464 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
257 return (be_wewy_wewy_quiet ? NULL : ret); \ 465 return (be_wewy_wewy_quiet ? NULL : ret); \
266 if (be_quiet || be_wewy_wewy_quiet) 474 if (be_quiet || be_wewy_wewy_quiet)
267 return NULL; 475 return NULL;
268 else 476 else
269 return " - "; 477 return " - ";
270} 478}
479
480/*
481 * Scan the .text section to see if there are any relocations in it.
482 * Should rewrite this to check PT_LOAD sections that are marked
483 * Executable rather than the section named '.text'.
484 */
271static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel) 485static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
272{ 486{
273 unsigned long s, r, rmax; 487 unsigned long s, r, rmax;
274 void *symtab_void, *strtab_void, *text_void; 488 void *symtab_void, *strtab_void, *text_void;
275 489
296 Elf ## B ## _Rela *rela; \ 510 Elf ## B ## _Rela *rela; \
297 /* search the section headers for relocations */ \ 511 /* search the section headers for relocations */ \
298 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \ 512 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
299 uint32_t sh_type = EGET(shdr[s].sh_type); \ 513 uint32_t sh_type = EGET(shdr[s].sh_type); \
300 if (sh_type == SHT_REL) { \ 514 if (sh_type == SHT_REL) { \
301 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \ 515 rel = REL ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
302 rela = NULL; \ 516 rela = NULL; \
303 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \ 517 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
304 } else if (sh_type == SHT_RELA) { \ 518 } else if (sh_type == SHT_RELA) { \
305 rel = NULL; \ 519 rel = NULL; \
306 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \ 520 rela = RELA ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
307 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \ 521 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
308 } else \ 522 } else \
309 continue; \ 523 continue; \
310 /* now see if any of the relocs are in the .text */ \ 524 /* now see if any of the relocs are in the .text */ \
311 for (r = 0; r < rmax; ++r) { \ 525 for (r = 0; r < rmax; ++r) { \
326 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \ 540 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
327 if (be_verbose <= 2) continue; \ 541 if (be_verbose <= 2) continue; \
328 } else \ 542 } else \
329 *found_textrels = 1; \ 543 *found_textrels = 1; \
330 /* locate this relocation symbol name */ \ 544 /* locate this relocation symbol name */ \
331 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 545 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
546 if ((void*)sym > elf->data_end) { \
547 warn("%s: corrupt ELF symbol", elf->filename); \
548 continue; \
549 } \
332 sym_max = ELF ## B ## _R_SYM(r_info); \ 550 sym_max = ELF ## B ## _R_SYM(r_info); \
333 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \ 551 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
334 sym += sym_max; \ 552 sym += sym_max; \
335 else \ 553 else \
336 sym = NULL; \ 554 sym = NULL; \
337 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 555 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
338 /* show the raw details about this reloc */ \ 556 /* show the raw details about this reloc */ \
339 printf(" %s: ", elf->base_filename); \ 557 printf(" %s: ", elf->base_filename); \
340 if (sym && sym->st_name) \ 558 if (sym && sym->st_name) \
341 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \ 559 printf("%s", elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
342 else \ 560 else \
343 printf("(memory/fake?)"); \ 561 printf("(memory/data?)"); \
344 printf(" [0x%lX]", (unsigned long)r_offset); \ 562 printf(" [0x%lX]", (unsigned long)r_offset); \
345 /* now try to find the closest symbol that this rel is probably in */ \ 563 /* now try to find the closest symbol that this rel is probably in */ \
346 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 564 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
347 func = NULL; \ 565 func = NULL; \
348 offset_tmp = 0; \ 566 offset_tmp = 0; \
349 while (sym_max--) { \ 567 while (sym_max--) { \
350 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \ 568 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
351 func = sym; \ 569 func = sym; \
352 offset_tmp = EGET(sym->st_value); \ 570 offset_tmp = EGET(sym->st_value); \
353 } \ 571 } \
354 ++sym; \ 572 ++sym; \
355 } \ 573 } \
356 printf(" in "); \ 574 printf(" in "); \
357 if (func && func->st_name) \ 575 if (func && func->st_name) { \
358 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \ 576 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
577 if (r_offset > EGET(func->st_size)) \
578 printf("(optimized out: previous %s)", func_name); \
359 else \ 579 else \
360 printf("(NULL: fake?)"); \ 580 printf("%s", func_name); \
581 } else \
582 printf("(optimized out)"); \
361 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \ 583 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
584 if (be_verbose && has_objdump) { \
585 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
586 char *sysbuf; \
587 size_t syslen; \
588 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"; \
589 syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
590 sysbuf = xmalloc(syslen); \
591 if (end_addr < r_offset) \
592 /* not uncommon when things are optimized out */ \
593 end_addr = r_offset + 0x100; \
594 snprintf(sysbuf, syslen, sysfmt, \
595 (unsigned long)offset_tmp, \
596 (unsigned long)end_addr, \
597 elf->filename, \
598 (unsigned long)r_offset); \
599 fflush(stdout); \
600 if (system(sysbuf)) /* don't care */; \
601 fflush(stdout); \
602 free(sysbuf); \
603 } \
362 } \ 604 } \
363 } } 605 } }
364 SHOW_TEXTRELS(32) 606 SHOW_TEXTRELS(32)
365 SHOW_TEXTRELS(64) 607 SHOW_TEXTRELS(64)
366 } 608 }
368 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename); 610 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
369 611
370 return NULL; 612 return NULL;
371} 613}
372 614
373static void rpath_security_checks(elfobj *, char *);
374static void rpath_security_checks(elfobj *elf, char *item) { 615static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
616{
375 struct stat st; 617 struct stat st;
376 switch (*item) { 618 switch (*item) {
377 case '/': break; 619 case '/': break;
378 case '.': 620 case '.':
379 warnf("Security problem with relative RPATH '%s' in %s", item, elf->filename); 621 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
380 break; 622 break;
623 case ':':
381 case '\0': 624 case '\0':
382 warnf("Security problem NULL RPATH in %s", elf->filename); 625 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
383 break; 626 break;
384 case '$': 627 case '$':
385 if (fstat(elf->fd, &st) != -1) 628 if (fstat(elf->fd, &st) != -1)
386 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID)) 629 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
387 warnf("Security problem with RPATH='%s' in %s with mode set of %o", 630 warnf("Security problem with %s='%s' in %s with mode set of %o",
388 item, elf->filename, st.st_mode & 07777); 631 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
389 break; 632 break;
390 default: 633 default:
391 warnf("Maybe? sec problem with RPATH='%s' in %s", item, elf->filename); 634 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
392 break; 635 break;
393 } 636 }
394} 637}
395static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len) 638static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
396{ 639{
397 unsigned long i, s; 640 unsigned long i;
398 char *rpath, *runpath, **r; 641 char *rpath, *runpath, **r;
399 void *strtbl_void; 642 void *strtbl_void;
400 643
401 if (!show_rpath) return; 644 if (!show_rpath) return;
402 645
413 Elf ## B ## _Off offset; \ 656 Elf ## B ## _Off offset; \
414 Elf ## B ## _Xword word; \ 657 Elf ## B ## _Xword word; \
415 /* Scan all the program headers */ \ 658 /* Scan all the program headers */ \
416 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 659 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
417 /* Just scan dynamic headers */ \ 660 /* Just scan dynamic headers */ \
418 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 661 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
419 offset = EGET(phdr[i].p_offset); \ 662 offset = EGET(phdr[i].p_offset); \
420 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 663 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
421 /* Just scan dynamic RPATH/RUNPATH headers */ \ 664 /* Just scan dynamic RPATH/RUNPATH headers */ \
422 dyn = DYN ## B (elf->data + offset); \ 665 dyn = DYN ## B (elf->vdata + offset); \
423 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \ 666 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
424 if (word == DT_RPATH) { \ 667 if (word == DT_RPATH) { \
425 r = &rpath; \ 668 r = &rpath; \
426 } else if (word == DT_RUNPATH) { \ 669 } else if (word == DT_RUNPATH) { \
427 r = &runpath; \ 670 r = &runpath; \
431 } \ 674 } \
432 /* Verify the memory is somewhat sane */ \ 675 /* Verify the memory is somewhat sane */ \
433 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 676 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
434 if (offset < (Elf ## B ## _Off)elf->len) { \ 677 if (offset < (Elf ## B ## _Off)elf->len) { \
435 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \ 678 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
436 *r = (char*)(elf->data + offset); \ 679 *r = elf->data + offset; \
680 /* cache the length in case we need to nuke this section later on */ \
681 if (fix_elf) \
682 offset = strlen(*r); \
437 /* If quiet, don't output paths in ld.so.conf */ \ 683 /* If quiet, don't output paths in ld.so.conf */ \
438 if (be_quiet) { \ 684 if (be_quiet) { \
439 size_t len; \ 685 size_t len; \
440 char *start, *end; \ 686 char *start, *end; \
441 /* note that we only 'chop' off leading known paths. */ \ 687 /* note that we only 'chop' off leading known paths. */ \
442 /* since *r is read-only memory, we can only move the ptr forward. */ \ 688 /* since *r is read-only memory, we can only move the ptr forward. */ \
443 start = *r; \ 689 start = *r; \
444 /* scan each path in : delimited list */ \ 690 /* scan each path in : delimited list */ \
445 while (start) { \ 691 while (start) { \
446 rpath_security_checks(elf, start); \ 692 rpath_security_checks(elf, start, get_elfdtype(word)); \
447 end = strchr(start, ':'); \ 693 end = strchr(start, ':'); \
448 len = (end ? abs(end - start) : strlen(start)); \ 694 len = (end ? abs(end - start) : strlen(start)); \
449 for (s = 0; ldpaths[s]; ++s) { \ 695 if (use_ldcache) { \
696 size_t n; \
697 const char *ldpath; \
698 array_for_each(ldpaths, n, ldpath) \
450 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \ 699 if (!strncmp(ldpath, start, len) && !ldpath[len]) { \
451 *r = (end ? end + 1 : NULL); \ 700 *r = end; \
701 /* corner case ... if RPATH reads "/usr/lib:", we want \
702 * to show ':' rather than '' */ \
703 if (end && end[1] != '\0') \
704 (*r)++; \
452 break; \ 705 break; \
453 } \ 706 } \
454 } \ 707 } \
455 if (!*r || !ldpaths[s] || !end) \ 708 if (!*r || !end) \
456 start = NULL; \ 709 break; \
457 else \ 710 else \
458 start = start + len + 1; \ 711 start = start + len + 1; \
459 } \ 712 } \
460 } \ 713 } \
714 if (*r) { \
715 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
716 /* just nuke it */ \
717 nuke_it##B: \
718 memset(*r, 0x00, offset); \
719 *r = NULL; \
720 ESET(dyn->d_tag, DT_DEBUG); \
721 ESET(dyn->d_un.d_ptr, 0); \
722 } else if (fix_elf) { \
723 /* try to clean "bad" paths */ \
724 size_t len, tmpdir_len; \
725 char *start, *end; \
726 const char *tmpdir; \
727 start = *r; \
728 tmpdir = (getenv("TMPDIR") ? : "."); \
729 tmpdir_len = strlen(tmpdir); \
730 while (1) { \
731 end = strchr(start, ':'); \
732 if (start == end) { \
733 eat_this_path##B: \
734 len = strlen(end); \
735 memmove(start, end+1, len); \
736 start[len-1] = '\0'; \
737 end = start - 1; \
738 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
739 if (!end) { \
740 if (start == *r) \
741 goto nuke_it##B; \
742 *--start = '\0'; \
743 } else \
744 goto eat_this_path##B; \
745 } \
746 if (!end) \
747 break; \
748 start = end + 1; \
749 } \
750 if (**r == '\0') \
751 goto nuke_it##B; \
752 } \
753 if (*r) \
461 if (*r) *found_rpath = 1; \ 754 *found_rpath = 1; \
755 } \
462 } \ 756 } \
463 ++dyn; \ 757 ++dyn; \
464 } \ 758 } \
465 } } 759 } }
466 SHOW_RPATH(32) 760 SHOW_RPATH(32)
488 782
489#define LDSO_CACHE_MAGIC "ld.so-" 783#define LDSO_CACHE_MAGIC "ld.so-"
490#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1) 784#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
491#define LDSO_CACHE_VER "1.7.0" 785#define LDSO_CACHE_VER "1.7.0"
492#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1) 786#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
787#define FLAG_ANY -1
788#define FLAG_TYPE_MASK 0x00ff
789#define FLAG_LIBC4 0x0000
790#define FLAG_ELF 0x0001
791#define FLAG_ELF_LIBC5 0x0002
792#define FLAG_ELF_LIBC6 0x0003
793#define FLAG_REQUIRED_MASK 0xff00
794#define FLAG_SPARC_LIB64 0x0100
795#define FLAG_IA64_LIB64 0x0200
796#define FLAG_X8664_LIB64 0x0300
797#define FLAG_S390_LIB64 0x0400
798#define FLAG_POWERPC_LIB64 0x0500
799#define FLAG_MIPS64_LIBN32 0x0600
800#define FLAG_MIPS64_LIBN64 0x0700
493 801
494static char *lookup_cache_lib(char *); 802#if defined(__GLIBC__) || defined(__UCLIBC__)
803
495static char *lookup_cache_lib(char *fname) 804static char *lookup_cache_lib(elfobj *elf, char *fname)
496{ 805{
497 int fd = 0; 806 int fd;
498 char *strs; 807 char *strs;
499 static char buf[_POSIX_PATH_MAX] = ""; 808 static char buf[__PAX_UTILS_PATH_MAX] = "";
500 const char *cachefile = "/etc/ld.so.cache"; 809 const char *cachefile = root_rel_path("/etc/ld.so.cache");
501 struct stat st; 810 struct stat st;
502 811
503 typedef struct { 812 typedef struct {
504 char magic[LDSO_CACHE_MAGIC_LEN]; 813 char magic[LDSO_CACHE_MAGIC_LEN];
505 char version[LDSO_CACHE_VER_LEN]; 814 char version[LDSO_CACHE_VER_LEN];
506 int nlibs; 815 int nlibs;
507 } header_t; 816 } header_t;
817 header_t *header;
508 818
509 typedef struct { 819 typedef struct {
510 int flags; 820 int flags;
511 int sooffset; 821 int sooffset;
512 int liboffset; 822 int liboffset;
513 } libentry_t; 823 } libentry_t;
514
515 header_t *header;
516 libentry_t *libent; 824 libentry_t *libent;
517 825
518 if (fname == NULL) 826 if (fname == NULL)
519 return NULL; 827 return NULL;
520 828
521 if (ldcache == 0) { 829 if (ldcache == NULL) {
522 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) < 0) 830 if (fstatat(root_fd, cachefile, &st, 0))
523 return NULL; 831 return NULL;
524 /* save the cache size for latter unmapping */ 832
833 fd = openat(root_fd, cachefile, O_RDONLY);
834 if (fd == -1)
835 return NULL;
836
837 /* cache these values so we only map/unmap the cache file once */
525 ldcache_size = st.st_size; 838 ldcache_size = st.st_size;
839 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
840 close(fd);
526 841
527 if ((ldcache = mmap(0, st.st_size, PROT_READ, MAP_SHARED, fd, 0)) == (caddr_t) -1) 842 if (ldcache == MAP_FAILED) {
843 ldcache = NULL;
528 return NULL; 844 return NULL;
845 }
529 846
530 close(fd);
531
532 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN)) 847 if (memcmp(header->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN) ||
848 memcmp(header->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
849 {
850 munmap(ldcache, ldcache_size);
851 ldcache = NULL;
533 return NULL; 852 return NULL;
534
535 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
536 return NULL;
537 } 853 }
854 } else
855 header = ldcache;
538 856
539 header = (header_t *) ldcache;
540 libent = (libentry_t *) (ldcache + sizeof(header_t)); 857 libent = ldcache + sizeof(header_t);
541 strs = (char *) &libent[header->nlibs]; 858 strs = (char *) &libent[header->nlibs];
542 859
543 for (fd = 0; fd < header->nlibs; fd++) { 860 for (fd = 0; fd < header->nlibs; ++fd) {
861 /* This should be more fine grained, but for now we assume that
862 * diff arches will not be cached together, and we ignore the
863 * the different multilib mips cases.
864 */
865 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
866 continue;
867 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
868 continue;
869
544 if (strcmp(fname, strs + libent[fd].sooffset) != 0) 870 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
545 continue; 871 continue;
872
873 /* Return first hit because that is how the ldso rolls */
546 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf)); 874 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
875 break;
547 } 876 }
877
548 return buf; 878 return buf;
549} 879}
550 880
881#elif defined(__NetBSD__)
882static char *lookup_cache_lib(elfobj *elf, char *fname)
883{
884 static char buf[__PAX_UTILS_PATH_MAX] = "";
885 static struct stat st;
886 size_t n;
887 char *ldpath;
888
889 array_for_each(ldpath, n, ldpath) {
890 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", ldpath, fname) >= sizeof(buf))
891 continue; /* if the pathname is too long, or something went wrong, ignore */
892
893 if (stat(buf, &st) != 0)
894 continue; /* if the lib doesn't exist in *ldpath, look further */
895
896 /* NetBSD doesn't actually do sanity checks, it just loads the file
897 * and if that doesn't work, continues looking in other directories.
898 * This cannot easily be safely emulated, unfortunately. For now,
899 * just assume that if it exists, it's a valid library. */
900
901 return buf;
902 }
903
904 /* not found in any path */
905 return NULL;
906}
907#else
908#ifdef __ELF__
909#warning Cache support not implemented for your target
910#endif
911static char *lookup_cache_lib(elfobj *elf, char *fname)
912{
913 return NULL;
914}
915#endif
551 916
552static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len) 917static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
553{ 918{
554 unsigned long i; 919 unsigned long i;
555 char *needed; 920 char *needed;
556 void *strtbl_void; 921 void *strtbl_void;
557 char *p; 922 char *p;
558 923
924 /*
925 * -n -> op==0 -> print all
926 * -N -> op==1 -> print requested
927 */
559 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL; 928 if ((op == 0 && !show_needed) || (op == 1 && !find_lib))
929 return NULL;
560 930
561 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 931 strtbl_void = elf_findsecbyname(elf, ".dynstr");
562 932
563 if (elf->phdr && strtbl_void) { 933 if (elf->phdr && strtbl_void) {
564#define SHOW_NEEDED(B) \ 934#define SHOW_NEEDED(B) \
566 Elf ## B ## _Dyn *dyn; \ 936 Elf ## B ## _Dyn *dyn; \
567 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 937 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
568 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 938 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
569 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 939 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
570 Elf ## B ## _Off offset; \ 940 Elf ## B ## _Off offset; \
941 size_t matched = 0; \
942 /* Walk all the program headers to find the PT_DYNAMIC */ \
571 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 943 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
572 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 944 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) \
945 continue; \
573 offset = EGET(phdr[i].p_offset); \ 946 offset = EGET(phdr[i].p_offset); \
574 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 947 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
948 continue; \
949 /* Walk all the dynamic tags to find NEEDED entries */ \
575 dyn = DYN ## B (elf->data + offset); \ 950 dyn = DYN ## B (elf->vdata + offset); \
576 while (EGET(dyn->d_tag) != DT_NULL) { \ 951 while (EGET(dyn->d_tag) != DT_NULL) { \
577 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 952 if (EGET(dyn->d_tag) == DT_NEEDED) { \
578 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 953 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
579 if (offset >= (Elf ## B ## _Off)elf->len) { \ 954 if (offset >= (Elf ## B ## _Off)elf->len) { \
580 ++dyn; \ 955 ++dyn; \
581 continue; \ 956 continue; \
582 } \ 957 } \
583 needed = (char*)(elf->data + offset); \ 958 needed = elf->data + offset; \
584 if (op == 0) { \ 959 if (op == 0) { \
960 /* -n -> print all entries */ \
585 if (!be_wewy_wewy_quiet) { \ 961 if (!be_wewy_wewy_quiet) { \
586 if (*found_needed) xchrcat(ret, ',', ret_len); \ 962 if (*found_needed) xchrcat(ret, ',', ret_len); \
587 if (printcache) \ 963 if (use_ldcache) \
588 if ((p = lookup_cache_lib(needed)) != NULL) \ 964 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
589 needed = p; \ 965 needed = p; \
590 xstrcat(ret, needed, ret_len); \ 966 xstrcat(ret, needed, ret_len); \
591 } \ 967 } \
592 *found_needed = 1; \ 968 *found_needed = 1; \
593 } else { \ 969 } else { \
594 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \ 970 /* -N -> print matching entries */ \
971 size_t n; \
972 const char *find_lib_name; \
973 \
974 array_for_each(find_lib_arr, n, find_lib_name) { \
975 int invert = 1; \
976 if (find_lib_name[0] == '!') \
977 invert = 0, ++find_lib_name; \
978 if (!strcmp(find_lib_name, needed) == invert) \
979 ++matched; \
980 } \
981 \
982 if (matched == array_cnt(find_lib_arr)) { \
595 *found_lib = 1; \ 983 *found_lib = 1; \
596 return (be_wewy_wewy_quiet ? NULL : needed); \ 984 return (be_wewy_wewy_quiet ? NULL : find_lib); \
597 } \ 985 } \
598 } \ 986 } \
599 } \ 987 } \
600 ++dyn; \ 988 ++dyn; \
601 } \ 989 } \
630} 1018}
631static char *scanelf_file_bind(elfobj *elf, char *found_bind) 1019static char *scanelf_file_bind(elfobj *elf, char *found_bind)
632{ 1020{
633 unsigned long i; 1021 unsigned long i;
634 struct stat s; 1022 struct stat s;
1023 char dynamic = 0;
635 1024
636 if (!show_bind) return NULL; 1025 if (!show_bind) return NULL;
637 if (!elf->phdr) return NULL; 1026 if (!elf->phdr) return NULL;
638 1027
639#define SHOW_BIND(B) \ 1028#define SHOW_BIND(B) \
641 Elf ## B ## _Dyn *dyn; \ 1030 Elf ## B ## _Dyn *dyn; \
642 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 1031 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
643 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 1032 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
644 Elf ## B ## _Off offset; \ 1033 Elf ## B ## _Off offset; \
645 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 1034 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
646 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 1035 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1036 dynamic = 1; \
647 offset = EGET(phdr[i].p_offset); \ 1037 offset = EGET(phdr[i].p_offset); \
648 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 1038 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
649 dyn = DYN ## B (elf->data + offset); \ 1039 dyn = DYN ## B (elf->vdata + offset); \
650 while (EGET(dyn->d_tag) != DT_NULL) { \ 1040 while (EGET(dyn->d_tag) != DT_NULL) { \
651 if (EGET(dyn->d_tag) == DT_BIND_NOW || \ 1041 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
652 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \ 1042 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
653 { \ 1043 { \
654 if (be_quiet) return NULL; \ 1044 if (be_quiet) return NULL; \
662 SHOW_BIND(32) 1052 SHOW_BIND(32)
663 SHOW_BIND(64) 1053 SHOW_BIND(64)
664 1054
665 if (be_wewy_wewy_quiet) return NULL; 1055 if (be_wewy_wewy_quiet) return NULL;
666 1056
1057 /* don't output anything if quiet mode and the ELF is static or not setuid */
667 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) { 1058 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
668 return NULL; 1059 return NULL;
669 } else { 1060 } else {
670 *found_bind = 1; 1061 *found_bind = 1;
671 return (char *) "LAZY"; 1062 return (char *)(dynamic ? "LAZY" : "STATIC");
672 } 1063 }
673} 1064}
674static char *scanelf_file_soname(elfobj *elf, char *found_soname) 1065static char *scanelf_file_soname(elfobj *elf, char *found_soname)
675{ 1066{
676 unsigned long i; 1067 unsigned long i;
688 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 1079 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
689 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 1080 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
690 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 1081 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
691 Elf ## B ## _Off offset; \ 1082 Elf ## B ## _Off offset; \
692 /* only look for soname in shared objects */ \ 1083 /* only look for soname in shared objects */ \
693 if (ehdr->e_type != ET_DYN) \ 1084 if (EGET(ehdr->e_type) != ET_DYN) \
694 return NULL; \ 1085 return NULL; \
695 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 1086 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
696 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 1087 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
697 offset = EGET(phdr[i].p_offset); \ 1088 offset = EGET(phdr[i].p_offset); \
698 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 1089 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
699 dyn = DYN ## B (elf->data + offset); \ 1090 dyn = DYN ## B (elf->vdata + offset); \
700 while (EGET(dyn->d_tag) != DT_NULL) { \ 1091 while (EGET(dyn->d_tag) != DT_NULL) { \
701 if (EGET(dyn->d_tag) == DT_SONAME) { \ 1092 if (EGET(dyn->d_tag) == DT_SONAME) { \
702 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 1093 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
703 if (offset >= (Elf ## B ## _Off)elf->len) { \ 1094 if (offset >= (Elf ## B ## _Off)elf->len) { \
704 ++dyn; \ 1095 ++dyn; \
705 continue; \ 1096 continue; \
706 } \ 1097 } \
707 soname = (char*)(elf->data + offset); \ 1098 soname = elf->data + offset; \
708 *found_soname = 1; \ 1099 *found_soname = 1; \
709 return (be_wewy_wewy_quiet ? NULL : soname); \ 1100 return (be_wewy_wewy_quiet ? NULL : soname); \
710 } \ 1101 } \
711 ++dyn; \ 1102 ++dyn; \
712 } \ 1103 } \
715 SHOW_SONAME(64) 1106 SHOW_SONAME(64)
716 } 1107 }
717 1108
718 return NULL; 1109 return NULL;
719} 1110}
1111
1112/*
1113 * We support the symbol form:
1114 * [%[modifiers]%][[+-]<symbol name>][,[.....]]
1115 * If the symbol name is empty, then all symbols are matched.
1116 * If the symbol name is a glob ("*"), then all symbols are dumped (debug).
1117 * Do not rely on this output format at all.
1118 * Otherwise the symbol name is used to search (either regex or string compare).
1119 * If the first char of the symbol name is a plus ("+"), then only match
1120 * defined symbols. If it's a minus ("-"), only match undefined symbols.
1121 * Putting modifiers in between the percent signs allows for more in depth
1122 * filters. There are groups of modifiers. If you don't specify a member
1123 * of a group, then all types in that group are matched. The current
1124 * groups and their types are:
1125 * STT group: STT_NOTYPE:n STT_OBJECT:o STT_FUNC:f SST_FILE:F
1126 * STB group: STB_LOCAL:l STB_GLOBAL:g STB_WEAK:w
1127 * SHN group: SHN_UNDEF:u SHN_ABS:a SHN_COMMON:c {defined}:d
1128 * The "defined" value in the SHN group does not correspond to a SHN_xxx define.
1129 * You can search for multiple symbols at once by seperating with a comma (",").
1130 *
1131 * Some examples:
1132 * ELFs with a weak function "foo":
1133 * scanelf -s %wf%foo <ELFs>
1134 * ELFs that define the symbol "main":
1135 * scanelf -s +main <ELFs>
1136 * scanelf -s %d%main <ELFs>
1137 * ELFs that refer to the undefined symbol "brk":
1138 * scanelf -s -brk <ELFs>
1139 * scanelf -s %u%brk <ELFs>
1140 * All global defined objects in an ELF:
1141 * scanelf -s %ogd% <ELF>
1142 */
1143static void
1144scanelf_match_symname(elfobj *elf, char *found_sym, char **ret, size_t *ret_len, const char *symname,
1145 unsigned int stt, unsigned int stb, unsigned int shn, unsigned long size)
1146{
1147 char *this_sym, *next_sym, saved = saved;
1148
1149 /* allow the user to specify a comma delimited list of symbols to search for */
1150 next_sym = NULL;
1151 do {
1152 bool inc_notype, inc_object, inc_func, inc_file,
1153 inc_local, inc_global, inc_weak,
1154 inc_def, inc_undef, inc_abs, inc_common;
1155
1156 if (next_sym) {
1157 next_sym[-1] = saved;
1158 this_sym = next_sym;
1159 } else
1160 this_sym = find_sym;
1161 if ((next_sym = strchr(this_sym, ','))) {
1162 /* make parsing easier by killing the comma temporarily */
1163 saved = *next_sym;
1164 *next_sym = '\0';
1165 next_sym += 1;
1166 }
1167
1168 /* symbol selection! */
1169 inc_notype = inc_object = inc_func = inc_file = \
1170 inc_local = inc_global = inc_weak = \
1171 inc_def = inc_undef = inc_abs = inc_common = \
1172 (*this_sym != '%');
1173
1174 /* parse the contents of %...% */
1175 if (!inc_notype) {
1176 while (*(this_sym++)) {
1177 if (*this_sym == '%') {
1178 ++this_sym;
1179 break;
1180 }
1181 switch (*this_sym) {
1182 case 'n': inc_notype = true; break;
1183 case 'o': inc_object = true; break;
1184 case 'f': inc_func = true; break;
1185 case 'F': inc_file = true; break;
1186 case 'l': inc_local = true; break;
1187 case 'g': inc_global = true; break;
1188 case 'w': inc_weak = true; break;
1189 case 'd': inc_def = true; break;
1190 case 'u': inc_undef = true; break;
1191 case 'a': inc_abs = true; break;
1192 case 'c': inc_common = true; break;
1193 default: err("invalid symbol selector '%c'", *this_sym);
1194 }
1195 }
1196
1197 /* If no types are matched, not match all */
1198 if (!inc_notype && !inc_object && !inc_func && !inc_file)
1199 inc_notype = inc_object = inc_func = inc_file = true;
1200 if (!inc_local && !inc_global && !inc_weak)
1201 inc_local = inc_global = inc_weak = true;
1202 if (!inc_def && !inc_undef && !inc_abs && !inc_common)
1203 inc_def = inc_undef = inc_abs = inc_common = true;
1204
1205 /* backwards compat for defined/undefined short hand */
1206 } else if (*this_sym == '+') {
1207 inc_undef = false;
1208 ++this_sym;
1209 } else if (*this_sym == '-') {
1210 inc_def = inc_abs = inc_common = false;
1211 ++this_sym;
1212 }
1213
1214 /* filter symbols */
1215 if ((!inc_notype && stt == STT_NOTYPE) || \
1216 (!inc_object && stt == STT_OBJECT) || \
1217 (!inc_func && stt == STT_FUNC ) || \
1218 (!inc_file && stt == STT_FILE ) || \
1219 (!inc_local && stb == STB_LOCAL ) || \
1220 (!inc_global && stb == STB_GLOBAL) || \
1221 (!inc_weak && stb == STB_WEAK ) || \
1222 (!inc_def && shn && shn < SHN_LORESERVE) || \
1223 (!inc_undef && shn == SHN_UNDEF ) || \
1224 (!inc_abs && shn == SHN_ABS ) || \
1225 (!inc_common && shn == SHN_COMMON))
1226 continue;
1227
1228 if (*this_sym == '*') {
1229 /* a "*" symbol gets you debug output */
1230 printf("%s(%s) %5lX %15s %15s %15s %s\n",
1231 ((*found_sym == 0) ? "\n\t" : "\t"),
1232 elf->base_filename,
1233 size,
1234 get_elfstttype(stt),
1235 get_elfstbtype(stb),
1236 get_elfshntype(shn),
1237 symname);
1238 goto matched;
1239
1240 } else {
1241 if (g_match) {
1242 /* regex match the symbol */
1243 if (rematch(this_sym, symname, REG_EXTENDED) != 0)
1244 continue;
1245
1246 } else if (*this_sym) {
1247 /* give empty symbols a "pass", else do a normal compare */
1248 const size_t len = strlen(this_sym);
1249 if (!(strncmp(this_sym, symname, len) == 0 &&
1250 /* Accept unversioned symbol names */
1251 (symname[len] == '\0' || symname[len] == '@')))
1252 continue;
1253 }
1254
1255 if (be_semi_verbose) {
1256 char buf[1024];
1257 snprintf(buf, sizeof(buf), "%lX %s %s",
1258 size,
1259 get_elfstttype(stt),
1260 this_sym);
1261 *ret = xstrdup(buf);
1262 } else {
1263 if (*ret) xchrcat(ret, ',', ret_len);
1264 xstrcat(ret, symname, ret_len);
1265 }
1266
1267 goto matched;
1268 }
1269 } while (next_sym);
1270
1271 return;
1272
1273 matched:
1274 *found_sym = 1;
1275 if (next_sym)
1276 next_sym[-1] = saved;
1277}
1278
720static char *scanelf_file_sym(elfobj *elf, char *found_sym) 1279static const char *scanelf_file_sym(elfobj *elf, char *found_sym)
721{ 1280{
722 unsigned long i;
723 char *ret; 1281 char *ret;
724 void *symtab_void, *strtab_void; 1282 void *symtab_void, *strtab_void;
725 1283
726 if (!find_sym) return NULL; 1284 if (!find_sym) return NULL;
727 ret = find_sym; 1285 ret = NULL;
728 1286
729 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void); 1287 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
730 1288
731 if (symtab_void && strtab_void) { 1289 if (symtab_void && strtab_void) {
732#define FIND_SYM(B) \ 1290#define FIND_SYM(B) \
733 if (elf->elf_class == ELFCLASS ## B) { \ 1291 if (elf->elf_class == ELFCLASS ## B) { \
734 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 1292 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
735 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 1293 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
736 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 1294 Elf ## B ## _Sym *sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
737 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 1295 Elf ## B ## _Word i, cnt = EGET(symtab->sh_entsize); \
738 char *symname; \ 1296 char *symname; \
1297 size_t ret_len = 0; \
1298 if (cnt) \
1299 cnt = EGET(symtab->sh_size) / cnt; \
739 for (i = 0; i < cnt; ++i) { \ 1300 for (i = 0; i < cnt; ++i) { \
1301 if ((void*)sym > elf->data_end) { \
1302 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1303 goto break_out; \
1304 } \
740 if (sym->st_name) { \ 1305 if (sym->st_name) { \
1306 /* make sure the symbol name is in acceptable memory range */ \
741 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 1307 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
742 if (*find_sym == '*') { \ 1308 if ((void*)symname > elf->data_end) { \
743 printf("%s(%s) %5lX %15s %s\n", \ 1309 warnf("%s: corrupt ELF symbols", elf->filename); \
744 ((*found_sym == 0) ? "\n\t" : "\t"), \ 1310 ++sym; \
745 elf->base_filename, \ 1311 continue; \
746 (unsigned long)sym->st_size, \
747 get_elfstttype(sym->st_info), \
748 symname); \
749 *found_sym = 1; \
750 } else { \
751 char *this_sym, *next_sym; \
752 this_sym = find_sym; \
753 do { \
754 next_sym = strchr(this_sym, ','); \
755 if (next_sym == NULL) \
756 next_sym = this_sym + strlen(this_sym); \
757 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
758 (strcmp(symname, versioned_symname) == 0)) { \
759 ret = this_sym; \
760 (*found_sym)++; \
761 goto break_out; \
762 } \
763 this_sym = next_sym + 1; \
764 } while (*next_sym != '\0'); \
765 } \ 1312 } \
1313 scanelf_match_symname(elf, found_sym, \
1314 &ret, &ret_len, symname, \
1315 ELF##B##_ST_TYPE(EGET(sym->st_info)), \
1316 ELF##B##_ST_BIND(EGET(sym->st_info)), \
1317 EGET(sym->st_shndx), \
1318 /* st_size can be 64bit, but no one is really that big, so screw em */ \
1319 EGET(sym->st_size)); \
766 } \ 1320 } \
767 ++sym; \ 1321 ++sym; \
768 } } 1322 } \
1323 }
769 FIND_SYM(32) 1324 FIND_SYM(32)
770 FIND_SYM(64) 1325 FIND_SYM(64)
771 } 1326 }
772 1327
773break_out: 1328break_out:
776 if (*find_sym != '*' && *found_sym) 1331 if (*find_sym != '*' && *found_sym)
777 return ret; 1332 return ret;
778 if (be_quiet) 1333 if (be_quiet)
779 return NULL; 1334 return NULL;
780 else 1335 else
781 return (char *)" - "; 1336 return " - ";
782} 1337}
1338
1339static const char *scanelf_file_sections(elfobj *elf, char *found_section)
1340{
1341 if (!find_section)
1342 return NULL;
1343
1344#define FIND_SECTION(B) \
1345 if (elf->elf_class == ELFCLASS ## B) { \
1346 size_t matched, n; \
1347 int invert; \
1348 const char *section_name; \
1349 Elf ## B ## _Shdr *section; \
1350 \
1351 matched = 0; \
1352 array_for_each(find_section_arr, n, section_name) { \
1353 invert = (*section_name == '!' ? 1 : 0); \
1354 section = SHDR ## B (elf_findsecbyname(elf, section_name + invert)); \
1355 if ((section == NULL && invert) || (section != NULL && !invert)) \
1356 ++matched; \
1357 } \
1358 \
1359 if (matched == array_cnt(find_section_arr)) \
1360 *found_section = 1; \
1361 }
1362 FIND_SECTION(32)
1363 FIND_SECTION(64)
1364
1365 if (be_wewy_wewy_quiet)
1366 return NULL;
1367
1368 if (*found_section)
1369 return find_section;
1370
1371 if (be_quiet)
1372 return NULL;
1373 else
1374 return " - ";
1375}
1376
783/* scan an elf file and show all the fun stuff */ 1377/* scan an elf file and show all the fun stuff */
784#define prints(str) write(fileno(stdout), str, strlen(str)) 1378#define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
785static void scanelf_file(const char *filename) 1379static int scanelf_elfobj(elfobj *elf)
786{ 1380{
787 unsigned long i; 1381 unsigned long i;
788 char found_pax, found_phdr, found_relro, found_load, found_textrel, 1382 char found_pax, found_phdr, found_relro, found_load, found_textrel,
789 found_rpath, found_needed, found_interp, found_bind, found_soname, 1383 found_rpath, found_needed, found_interp, found_bind, found_soname,
790 found_sym, found_lib, found_file, found_textrels; 1384 found_sym, found_lib, found_file, found_textrels, found_section;
791 elfobj *elf;
792 struct stat st;
793 static char *out_buffer = NULL; 1385 static char *out_buffer = NULL;
794 static size_t out_len; 1386 static size_t out_len;
795 1387
796 /* make sure 'filename' exists */
797 if (lstat(filename, &st) == -1) {
798 if (be_verbose > 2) printf("%s: does not exist\n", filename);
799 return;
800 }
801 /* always handle regular files and handle symlinked files if no -y */
802 if (S_ISLNK(st.st_mode)) {
803 if (!scan_symlink) return;
804 stat(filename, &st);
805 }
806 if (!S_ISREG(st.st_mode)) {
807 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
808 return;
809 }
810
811 found_pax = found_phdr = found_relro = found_load = found_textrel = \ 1388 found_pax = found_phdr = found_relro = found_load = found_textrel = \
812 found_rpath = found_needed = found_interp = found_bind = found_soname = \ 1389 found_rpath = found_needed = found_interp = found_bind = found_soname = \
813 found_sym = found_lib = found_file = found_textrels = 0; 1390 found_sym = found_lib = found_file = found_textrels = found_section = 0;
814 1391
815 /* verify this is real ELF */
816 if ((elf = readelf(filename)) == NULL) {
817 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
818 return;
819 }
820
821 if (be_verbose > 1) 1392 if (be_verbose > 2)
822 printf("%s: scanning file {%s,%s}\n", filename, 1393 printf("%s: scanning file {%s,%s}\n", elf->filename,
823 get_elfeitype(EI_CLASS, elf->elf_class), 1394 get_elfeitype(EI_CLASS, elf->elf_class),
824 get_elfeitype(EI_DATA, elf->data[EI_DATA])); 1395 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
825 else if (be_verbose) 1396 else if (be_verbose > 1)
826 printf("%s: scanning file\n", filename); 1397 printf("%s: scanning file\n", elf->filename);
827 1398
828 /* init output buffer */ 1399 /* init output buffer */
829 if (!out_buffer) { 1400 if (!out_buffer) {
830 out_len = sizeof(char) * 80; 1401 out_len = sizeof(char) * 80;
831 out_buffer = (char*)xmalloc(out_len); 1402 out_buffer = xmalloc(out_len);
832 } 1403 }
833 *out_buffer = '\0'; 1404 *out_buffer = '\0';
834 1405
835 /* show the header */ 1406 /* show the header */
836 if (!be_quiet && show_banner) { 1407 if (!be_quiet && show_banner) {
837 for (i = 0; out_format[i]; ++i) { 1408 for (i = 0; out_format[i]; ++i) {
838 if (!IS_MODIFIER(out_format[i])) continue; 1409 if (!IS_MODIFIER(out_format[i])) continue;
839 1410
840 switch (out_format[++i]) { 1411 switch (out_format[++i]) {
1412 case '+': break;
841 case '%': break; 1413 case '%': break;
842 case '#': break; 1414 case '#': break;
843 case 'F': 1415 case 'F':
844 case 'p': 1416 case 'p':
845 case 'f': prints("FILE "); found_file = 1; break; 1417 case 'f': prints("FILE "); found_file = 1; break;
846 case 'o': prints(" TYPE "); break; 1418 case 'o': prints(" TYPE "); break;
847 case 'x': prints(" PAX "); break; 1419 case 'x': prints(" PAX "); break;
848 case 'e': prints("STK/REL/PTL "); break; 1420 case 'e': prints("STK/REL/PTL "); break;
849 case 't': prints("TEXTREL "); break; 1421 case 't': prints("TEXTREL "); break;
850 case 'r': prints("RPATH "); break; 1422 case 'r': prints("RPATH "); break;
1423 case 'M': prints("CLASS "); break;
851 case 'n': prints("NEEDED "); break; 1424 case 'n': prints("NEEDED "); break;
852 case 'i': prints("INTERP "); break; 1425 case 'i': prints("INTERP "); break;
853 case 'b': prints("BIND "); break; 1426 case 'b': prints("BIND "); break;
1427 case 'Z': prints("SIZE "); break;
854 case 'S': prints("SONAME "); break; 1428 case 'S': prints("SONAME "); break;
855 case 's': prints("SYM "); break; 1429 case 's': prints("SYM "); break;
856 case 'N': prints("LIB "); break; 1430 case 'N': prints("LIB "); break;
857 case 'T': prints("TEXTRELS "); break; 1431 case 'T': prints("TEXTRELS "); break;
1432 case 'k': prints("SECTION "); break;
1433 case 'a': prints("ARCH "); break;
1434 case 'I': prints("OSABI "); break;
1435 case 'Y': prints("EABI "); break;
1436 case 'O': prints("PERM "); break;
1437 case 'D': prints("ENDIAN "); break;
858 default: warnf("'%c' has no title ?", out_format[i]); 1438 default: warnf("'%c' has no title ?", out_format[i]);
859 } 1439 }
860 } 1440 }
861 if (!found_file) prints("FILE "); 1441 if (!found_file) prints("FILE ");
862 prints("\n"); 1442 prints("\n");
866 1446
867 /* dump all the good stuff */ 1447 /* dump all the good stuff */
868 for (i = 0; out_format[i]; ++i) { 1448 for (i = 0; out_format[i]; ++i) {
869 const char *out; 1449 const char *out;
870 const char *tmp; 1450 const char *tmp;
871 1451 static char ubuf[sizeof(unsigned long)*2];
872 /* make sure we trim leading spaces in quiet mode */
873 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
874 *out_buffer = '\0';
875
876 if (!IS_MODIFIER(out_format[i])) { 1452 if (!IS_MODIFIER(out_format[i])) {
877 xchrcat(&out_buffer, out_format[i], &out_len); 1453 xchrcat(&out_buffer, out_format[i], &out_len);
878 continue; 1454 continue;
879 } 1455 }
880 1456
881 out = NULL; 1457 out = NULL;
882 be_wewy_wewy_quiet = (out_format[i] == '#'); 1458 be_wewy_wewy_quiet = (out_format[i] == '#');
1459 be_semi_verbose = (out_format[i] == '+');
883 switch (out_format[++i]) { 1460 switch (out_format[++i]) {
1461 case '+':
884 case '%': 1462 case '%':
885 case '#': 1463 case '#':
886 xchrcat(&out_buffer, out_format[i], &out_len); break; 1464 xchrcat(&out_buffer, out_format[i], &out_len); break;
887 case 'F': 1465 case 'F':
888 found_file = 1; 1466 found_file = 1;
889 if (be_wewy_wewy_quiet) break; 1467 if (be_wewy_wewy_quiet) break;
890 xstrcat(&out_buffer, filename, &out_len); 1468 xstrcat(&out_buffer, elf->filename, &out_len);
891 break; 1469 break;
892 case 'p': 1470 case 'p':
893 found_file = 1; 1471 found_file = 1;
894 if (be_wewy_wewy_quiet) break; 1472 if (be_wewy_wewy_quiet) break;
895 tmp = filename; 1473 tmp = elf->filename;
896 if (search_path) { 1474 if (search_path) {
897 ssize_t len_search = strlen(search_path); 1475 ssize_t len_search = strlen(search_path);
898 ssize_t len_file = strlen(filename); 1476 ssize_t len_file = strlen(elf->filename);
899 if (!strncmp(filename, search_path, len_search) && \ 1477 if (!strncmp(elf->filename, search_path, len_search) && \
900 len_file > len_search) 1478 len_file > len_search)
901 tmp += len_search; 1479 tmp += len_search;
902 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++; 1480 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
903 } 1481 }
904 xstrcat(&out_buffer, tmp, &out_len); 1482 xstrcat(&out_buffer, tmp, &out_len);
905 break; 1483 break;
906 case 'f': 1484 case 'f':
907 found_file = 1; 1485 found_file = 1;
908 if (be_wewy_wewy_quiet) break; 1486 if (be_wewy_wewy_quiet) break;
909 tmp = strrchr(filename, '/'); 1487 tmp = strrchr(elf->filename, '/');
910 tmp = (tmp == NULL ? filename : tmp+1); 1488 tmp = (tmp == NULL ? elf->filename : tmp+1);
911 xstrcat(&out_buffer, tmp, &out_len); 1489 xstrcat(&out_buffer, tmp, &out_len);
912 break; 1490 break;
913 case 'o': out = get_elfetype(elf); break; 1491 case 'o': out = get_elfetype(elf); break;
914 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1492 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
915 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break; 1493 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
916 case 't': out = scanelf_file_textrel(elf, &found_textrel); break; 1494 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
917 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break; 1495 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
918 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break; 1496 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1497 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1498 case 'D': out = get_endian(elf); break;
1499 case 'O': out = strfileperms(elf->filename); break;
919 case 'n': 1500 case 'n':
920 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break; 1501 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
921 case 'i': out = scanelf_file_interp(elf, &found_interp); break; 1502 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
922 case 'b': out = scanelf_file_bind(elf, &found_bind); break; 1503 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
923 case 'S': out = scanelf_file_soname(elf, &found_soname); break; 1504 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
924 case 's': out = scanelf_file_sym(elf, &found_sym); break; 1505 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1506 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1507 case 'a': out = get_elfemtype(elf); break;
1508 case 'I': out = get_elfosabi(elf); break;
1509 case 'Y': out = get_elf_eabi(elf); break;
1510 case 'Z': snprintf(ubuf, sizeof(ubuf), "%lu", (unsigned long)elf->len); out = ubuf; break;;
925 default: warnf("'%c' has no scan code?", out_format[i]); 1511 default: warnf("'%c' has no scan code?", out_format[i]);
926 } 1512 }
927 if (out) { 1513 if (out)
928 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
929 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
930 xstrncat(&out_buffer, out, &out_len, (tmp-out));
931 else
932 xstrcat(&out_buffer, out, &out_len); 1514 xstrcat(&out_buffer, out, &out_len);
933 }
934 } 1515 }
935 1516
936#define FOUND_SOMETHING() \ 1517#define FOUND_SOMETHING() \
937 (found_pax || found_phdr || found_relro || found_load || found_textrel || \ 1518 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
938 found_rpath || found_needed || found_interp || found_bind || \ 1519 found_rpath || found_needed || found_interp || found_bind || \
939 found_soname || found_sym || found_lib || found_textrels) 1520 found_soname || found_sym || found_lib || found_textrels || found_section )
940 1521
941 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) { 1522 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
942 xchrcat(&out_buffer, ' ', &out_len); 1523 xchrcat(&out_buffer, ' ', &out_len);
943 xstrcat(&out_buffer, filename, &out_len); 1524 xstrcat(&out_buffer, elf->filename, &out_len);
944 } 1525 }
945 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) { 1526 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
946 puts(out_buffer); 1527 puts(out_buffer);
947 fflush(stdout); 1528 fflush(stdout);
948 } 1529 }
949 1530
1531 return 0;
1532}
1533
1534/* scan a single elf */
1535static int scanelf_elf(const char *filename, int fd, size_t len)
1536{
1537 int ret = 1;
1538 elfobj *elf;
1539
1540 /* verify this is real ELF */
1541 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1542 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1543 return 2;
1544 }
1545 switch (match_bits) {
1546 case 32:
1547 if (elf->elf_class != ELFCLASS32)
1548 goto label_done;
1549 break;
1550 case 64:
1551 if (elf->elf_class != ELFCLASS64)
1552 goto label_done;
1553 break;
1554 default: break;
1555 }
1556 if (match_etypes) {
1557 char sbuf[126];
1558 strncpy(sbuf, match_etypes, sizeof(sbuf));
1559 if (strchr(match_etypes, ',') != NULL) {
1560 char *p;
1561 while ((p = strrchr(sbuf, ',')) != NULL) {
1562 *p = 0;
1563 if (etype_lookup(p+1) == get_etype(elf))
1564 goto label_ret;
1565 }
1566 }
1567 if (etype_lookup(sbuf) != get_etype(elf))
1568 goto label_done;
1569 }
1570
1571label_ret:
1572 ret = scanelf_elfobj(elf);
1573
1574label_done:
950 unreadelf(elf); 1575 unreadelf(elf);
1576 return ret;
1577}
1578
1579/* scan an archive of elfs */
1580static int scanelf_archive(const char *filename, int fd, size_t len)
1581{
1582 archive_handle *ar;
1583 archive_member *m;
1584 char *ar_buffer;
1585 elfobj *elf;
1586
1587 ar = ar_open_fd(filename, fd);
1588 if (ar == NULL)
1589 return 1;
1590
1591 ar_buffer = mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1592 while ((m = ar_next(ar)) != NULL) {
1593 off_t cur_pos = lseek(fd, 0, SEEK_CUR);
1594 if (cur_pos == -1)
1595 errp("lseek() failed");
1596 elf = readelf_buffer(m->name, ar_buffer + cur_pos, m->size);
1597 if (elf) {
1598 scanelf_elfobj(elf);
1599 unreadelf(elf);
1600 }
1601 }
1602 munmap(ar_buffer, len);
1603
1604 return 0;
1605}
1606/* scan a file which may be an elf or an archive or some other magical beast */
1607static int scanelf_fileat(int dir_fd, const char *filename, const struct stat *st_cache)
1608{
1609 const struct stat *st = st_cache;
1610 struct stat symlink_st;
1611 int fd;
1612
1613 /* always handle regular files and handle symlinked files if no -y */
1614 if (S_ISLNK(st->st_mode)) {
1615 if (!scan_symlink)
1616 return 1;
1617 fstatat(dir_fd, filename, &symlink_st, 0);
1618 st = &symlink_st;
1619 }
1620
1621 if (!S_ISREG(st->st_mode)) {
1622 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1623 return 1;
1624 }
1625
1626 if (match_perms) {
1627 if ((st->st_mode | match_perms) != st->st_mode)
1628 return 1;
1629 }
1630 fd = openat(dir_fd, filename, (fix_elf ? O_RDWR : O_RDONLY) | O_CLOEXEC);
1631 if (fd == -1)
1632 return 1;
1633
1634 if (scanelf_elf(filename, fd, st->st_size) == 2) {
1635 /* if it isn't an ELF, maybe it's an .a archive */
1636 if (scan_archives)
1637 scanelf_archive(filename, fd, st->st_size);
1638
1639 /*
1640 * unreadelf() implicitly closes its fd, so only close it
1641 * when we are returning it in the non-ELF case
1642 */
1643 close(fd);
1644 }
1645
1646 return 0;
951} 1647}
952 1648
953/* scan a directory for ET_EXEC files and print when we find one */ 1649/* scan a directory for ET_EXEC files and print when we find one */
954static void scanelf_dir(const char *path) 1650static int scanelf_dirat(int dir_fd, const char *path)
955{ 1651{
956 register DIR *dir; 1652 register DIR *dir;
957 register struct dirent *dentry; 1653 register struct dirent *dentry;
958 struct stat st_top, st; 1654 struct stat st_top, st;
959 char buf[_POSIX_PATH_MAX]; 1655 char buf[__PAX_UTILS_PATH_MAX], *subpath;
960 size_t pathlen = 0, len = 0; 1656 size_t pathlen = 0, len = 0;
1657 int ret = 0;
1658 int subdir_fd;
961 1659
962 /* make sure path exists */ 1660 /* make sure path exists */
963 if (lstat(path, &st_top) == -1) { 1661 if (fstatat(dir_fd, path, &st_top, AT_SYMLINK_NOFOLLOW) == -1) {
964 if (be_verbose > 2) printf("%s: does not exist\n", path); 1662 if (be_verbose > 2) printf("%s: does not exist\n", path);
965 return; 1663 return 1;
966 } 1664 }
967 1665
968 /* ok, if it isn't a directory, assume we can open it */ 1666 /* ok, if it isn't a directory, assume we can open it */
969 if (!S_ISDIR(st_top.st_mode)) { 1667 if (!S_ISDIR(st_top.st_mode))
970 scanelf_file(path); 1668 return scanelf_fileat(dir_fd, path, &st_top);
971 return;
972 }
973 1669
974 /* now scan the dir looking for fun stuff */ 1670 /* now scan the dir looking for fun stuff */
975 if ((dir = opendir(path)) == NULL) { 1671 subdir_fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
1672 if (subdir_fd == -1)
1673 dir = NULL;
1674 else
1675 dir = fdopendir(subdir_fd);
1676 if (dir == NULL) {
1677 if (subdir_fd != -1)
1678 close(subdir_fd);
976 warnf("could not opendir %s: %s", path, strerror(errno)); 1679 warnf("could not opendir %s: %s", path, strerror(errno));
977 return; 1680 return 1;
978 } 1681 }
979 if (be_verbose) printf("%s: scanning dir\n", path); 1682 if (be_verbose > 1) printf("%s: scanning dir\n", path);
980 1683
981 pathlen = strlen(path); 1684 subpath = stpcpy(buf, path);
1685 *subpath++ = '/';
1686 pathlen = subpath - buf;
982 while ((dentry = readdir(dir))) { 1687 while ((dentry = readdir(dir))) {
983 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1688 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
984 continue; 1689 continue;
985 len = (pathlen + 1 + strlen(dentry->d_name) + 1); 1690
986 if (len >= sizeof(buf)) { 1691 if (fstatat(subdir_fd, dentry->d_name, &st, AT_SYMLINK_NOFOLLOW) == -1)
987 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
988 (unsigned long)len, (unsigned long)sizeof(buf));
989 continue; 1692 continue;
1693
1694 len = strlen(dentry->d_name);
1695 if (len + pathlen + 1 >= sizeof(buf)) {
1696 warnf("Skipping '%s%s': len > sizeof(buf); %zu > %zu\n",
1697 path, dentry->d_name, len + pathlen + 1, sizeof(buf));
1698 continue;
990 } 1699 }
991 sprintf(buf, "%s/%s", path, dentry->d_name); 1700 memcpy(subpath, dentry->d_name, len);
992 if (lstat(buf, &st) != -1) { 1701 subpath[len] = '\0';
1702
993 if (S_ISREG(st.st_mode)) 1703 if (S_ISREG(st.st_mode))
994 scanelf_file(buf); 1704 ret = scanelf_fileat(dir_fd, buf, &st);
995 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1705 else if (dir_recurse && S_ISDIR(st.st_mode)) {
996 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1706 if (dir_crossmount || (st_top.st_dev == st.st_dev))
997 scanelf_dir(buf); 1707 ret = scanelf_dirat(dir_fd, buf);
998 }
999 } 1708 }
1000 } 1709 }
1001 closedir(dir); 1710 closedir(dir);
1002}
1003 1711
1712 return ret;
1713}
1714static int scanelf_dir(const char *path)
1715{
1716 return scanelf_dirat(root_fd, root_rel_path(path));
1717}
1718
1004static int scanelf_from_file(char *filename) 1719static int scanelf_from_file(const char *filename)
1005{ 1720{
1006 FILE *fp = NULL; 1721 FILE *fp;
1007 char *p; 1722 char *p, *path;
1008 char path[_POSIX_PATH_MAX]; 1723 size_t len;
1724 int ret;
1009 1725
1010 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL)) 1726 if (strcmp(filename, "-") == 0)
1011 fp = stdin; 1727 fp = stdin;
1012 else if ((fp = fopen(filename, "r")) == NULL) 1728 else if ((fp = fopen(filename, "r")) == NULL)
1013 return 1; 1729 return 1;
1014 1730
1015 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1731 path = NULL;
1732 len = 0;
1733 ret = 0;
1734 while (getline(&path, &len, fp) != -1) {
1016 if ((p = strchr(path, '\n')) != NULL) 1735 if ((p = strchr(path, '\n')) != NULL)
1017 *p = 0; 1736 *p = 0;
1018 search_path = path; 1737 search_path = path;
1019 scanelf_dir(path); 1738 ret = scanelf_dir(path);
1020 } 1739 }
1740 free(path);
1741
1021 if (fp != stdin) 1742 if (fp != stdin)
1022 fclose(fp); 1743 fclose(fp);
1744
1023 return 0; 1745 return ret;
1024} 1746}
1025 1747
1026static void load_ld_so_conf() 1748#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1749
1750static int load_ld_cache_config(int i, const char *fname)
1027{ 1751{
1028 FILE *fp = NULL; 1752 FILE *fp = NULL;
1029 char *p; 1753 char *p, *path;
1030 char path[_POSIX_PATH_MAX]; 1754 size_t len;
1031 int i = 0; 1755 int curr_fd = -1;
1032 1756
1033 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1757 fp = fopenat_r(root_fd, root_rel_path(fname));
1758 if (fp == NULL)
1034 return; 1759 return i;
1035 1760
1036 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1761 path = NULL;
1037 if (*path != '/') 1762 len = 0;
1038 continue; 1763 while (getline(&path, &len, fp) != -1) {
1039
1040 if ((p = strrchr(path, '\r')) != NULL) 1764 if ((p = strrchr(path, '\r')) != NULL)
1041 *p = 0; 1765 *p = 0;
1042 if ((p = strchr(path, '\n')) != NULL) 1766 if ((p = strchr(path, '\n')) != NULL)
1043 *p = 0; 1767 *p = 0;
1044 1768
1045 ldpaths[i++] = xstrdup(path); 1769 /* recursive includes of the same file will make this segfault. */
1770 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1771 glob_t gl;
1772 size_t x;
1773 const char *gpath;
1046 1774
1047 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths)) 1775 /* re-use existing path buffer ... need to be creative */
1048 break; 1776 if (path[8] != '/')
1777 gpath = memcpy(path + 3, "/etc/", 5);
1778 else
1779 gpath = path + 8;
1780 if (root_fd != AT_FDCWD) {
1781 if (curr_fd == -1) {
1782 curr_fd = open(".", O_RDONLY|O_CLOEXEC);
1783 if (fchdir(root_fd))
1784 errp("unable to change to root dir");
1785 }
1786 gpath = root_rel_path(gpath);
1787 }
1788
1789 if (glob(gpath, 0, NULL, &gl) == 0) {
1790 for (x = 0; x < gl.gl_pathc; ++x) {
1791 /* try to avoid direct loops */
1792 if (strcmp(gl.gl_pathv[x], fname) == 0)
1793 continue;
1794 i = load_ld_cache_config(i, gl.gl_pathv[x]);
1795 }
1796 globfree(&gl);
1797 }
1798
1799 /* failed globs are ignored by glibc */
1800 continue;
1049 } 1801 }
1050 ldpaths[i] = NULL; 1802
1803 if (*path != '/')
1804 continue;
1805
1806 xarraypush_str(ldpaths, path);
1807 }
1808 free(path);
1051 1809
1052 fclose(fp); 1810 fclose(fp);
1811
1812 if (curr_fd != -1) {
1813 if (fchdir(curr_fd))
1814 /* don't care */;
1815 close(curr_fd);
1816 }
1817
1818 return i;
1053} 1819}
1820
1821#elif defined(__FreeBSD__) || defined(__DragonFly__)
1822
1823static int load_ld_cache_config(int i, const char *fname)
1824{
1825 FILE *fp = NULL;
1826 char *b = NULL, *p;
1827 struct elfhints_hdr hdr;
1828
1829 fp = fopenat_r(root_fd, root_rel_path(fname));
1830 if (fp == NULL)
1831 return i;
1832
1833 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1834 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1835 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1836 {
1837 fclose(fp);
1838 return i;
1839 }
1840
1841 b = xmalloc(hdr.dirlistlen + 1);
1842 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1843 fclose(fp);
1844 free(b);
1845 return i;
1846 }
1847
1848 while ((p = strsep(&b, ":"))) {
1849 if (*p == '\0')
1850 continue;
1851 xarraypush_str(ldpaths, p);
1852 }
1853
1854 free(b);
1855 fclose(fp);
1856 return i;
1857}
1858
1859#else
1860#ifdef __ELF__
1861#warning Cache config support not implemented for your target
1862#endif
1863static int load_ld_cache_config(int i, const char *fname)
1864{
1865 return 0;
1866}
1867#endif
1054 1868
1055/* scan /etc/ld.so.conf for paths */ 1869/* scan /etc/ld.so.conf for paths */
1056static void scanelf_ldpath() 1870static void scanelf_ldpath(void)
1057{ 1871{
1058 char scan_l, scan_ul, scan_ull; 1872 char scan_l, scan_ul, scan_ull;
1873 size_t n;
1874 const char *ldpath;
1059 int i = 0; 1875 int i = 0;
1060 1876
1061 if (!ldpaths[0]) 1877 if (array_cnt(ldpaths) == 0)
1062 err("Unable to load any paths from ld.so.conf"); 1878 err("Unable to load any paths from ld.so.conf");
1063 1879
1064 scan_l = scan_ul = scan_ull = 0; 1880 scan_l = scan_ul = scan_ull = 0;
1065 1881
1066 while (ldpaths[i]) { 1882 array_for_each(ldpaths, n, ldpath) {
1067 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1; 1883 if (!scan_l && !strcmp(ldpath, "/lib")) scan_l = 1;
1068 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1; 1884 if (!scan_ul && !strcmp(ldpath, "/usr/lib")) scan_ul = 1;
1069 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1; 1885 if (!scan_ull && !strcmp(ldpath, "/usr/local/lib")) scan_ull = 1;
1070 scanelf_dir(ldpaths[i]); 1886 scanelf_dir(ldpath);
1071 ++i; 1887 ++i;
1072 } 1888 }
1073 1889
1074 if (!scan_l) scanelf_dir("/lib"); 1890 if (!scan_l) scanelf_dir("/lib");
1075 if (!scan_ul) scanelf_dir("/usr/lib"); 1891 if (!scan_ul) scanelf_dir("/usr/lib");
1076 if (!scan_ull) scanelf_dir("/usr/local/lib"); 1892 if (!scan_ull) scanelf_dir("/usr/local/lib");
1077} 1893}
1078 1894
1079/* scan env PATH for paths */ 1895/* scan env PATH for paths */
1080static void scanelf_envpath() 1896static void scanelf_envpath(void)
1081{ 1897{
1082 char *path, *p; 1898 char *path, *p;
1083 1899
1084 path = getenv("PATH"); 1900 path = getenv("PATH");
1085 if (!path) 1901 if (!path)
1092 } 1908 }
1093 1909
1094 free(path); 1910 free(path);
1095} 1911}
1096 1912
1097 1913/* usage / invocation handling functions */ /* Free Flags: c d j u w G H J K P Q U W */
1098/* usage / invocation handling functions */
1099#define PARSE_FLAGS "plRmyxetrnLibSs:gN:TaqvF:f:o:BhV" 1914#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZCBhV"
1100#define a_argument required_argument 1915#define a_argument required_argument
1101static struct option const long_opts[] = { 1916static struct option const long_opts[] = {
1102 {"path", no_argument, NULL, 'p'}, 1917 {"path", no_argument, NULL, 'p'},
1103 {"ldpath", no_argument, NULL, 'l'}, 1918 {"ldpath", no_argument, NULL, 'l'},
1919 {"root", a_argument, NULL, 128},
1104 {"recursive", no_argument, NULL, 'R'}, 1920 {"recursive", no_argument, NULL, 'R'},
1105 {"mount", no_argument, NULL, 'm'}, 1921 {"mount", no_argument, NULL, 'm'},
1106 {"symlink", no_argument, NULL, 'y'}, 1922 {"symlink", no_argument, NULL, 'y'},
1923 {"archives", no_argument, NULL, 'A'},
1924 {"ldcache", no_argument, NULL, 'L'},
1925 {"fix", no_argument, NULL, 'X'},
1926 {"setpax", a_argument, NULL, 'z'},
1107 {"pax", no_argument, NULL, 'x'}, 1927 {"pax", no_argument, NULL, 'x'},
1108 {"header", no_argument, NULL, 'e'}, 1928 {"header", no_argument, NULL, 'e'},
1109 {"textrel", no_argument, NULL, 't'}, 1929 {"textrel", no_argument, NULL, 't'},
1110 {"rpath", no_argument, NULL, 'r'}, 1930 {"rpath", no_argument, NULL, 'r'},
1111 {"needed", no_argument, NULL, 'n'}, 1931 {"needed", no_argument, NULL, 'n'},
1112 {"ldcache", no_argument, NULL, 'L'},
1113 {"interp", no_argument, NULL, 'i'}, 1932 {"interp", no_argument, NULL, 'i'},
1114 {"bind", no_argument, NULL, 'b'}, 1933 {"bind", no_argument, NULL, 'b'},
1115 {"soname", no_argument, NULL, 'S'}, 1934 {"soname", no_argument, NULL, 'S'},
1116 {"symbol", a_argument, NULL, 's'}, 1935 {"symbol", a_argument, NULL, 's'},
1936 {"section", a_argument, NULL, 'k'},
1117 {"lib", a_argument, NULL, 'N'}, 1937 {"lib", a_argument, NULL, 'N'},
1118 {"gmatch", no_argument, NULL, 'g'}, 1938 {"gmatch", no_argument, NULL, 'g'},
1119 {"textrels", no_argument, NULL, 'T'}, 1939 {"textrels", no_argument, NULL, 'T'},
1940 {"etype", a_argument, NULL, 'E'},
1941 {"bits", a_argument, NULL, 'M'},
1942 {"endian", no_argument, NULL, 'D'},
1943 {"osabi", no_argument, NULL, 'I'},
1944 {"eabi", no_argument, NULL, 'Y'},
1945 {"perms", a_argument, NULL, 'O'},
1946 {"size", no_argument, NULL, 'Z'},
1120 {"all", no_argument, NULL, 'a'}, 1947 {"all", no_argument, NULL, 'a'},
1121 {"quiet", no_argument, NULL, 'q'}, 1948 {"quiet", no_argument, NULL, 'q'},
1122 {"verbose", no_argument, NULL, 'v'}, 1949 {"verbose", no_argument, NULL, 'v'},
1123 {"format", a_argument, NULL, 'F'}, 1950 {"format", a_argument, NULL, 'F'},
1124 {"from", a_argument, NULL, 'f'}, 1951 {"from", a_argument, NULL, 'f'},
1125 {"file", a_argument, NULL, 'o'}, 1952 {"file", a_argument, NULL, 'o'},
1953 {"nocolor", no_argument, NULL, 'C'},
1126 {"nobanner", no_argument, NULL, 'B'}, 1954 {"nobanner", no_argument, NULL, 'B'},
1127 {"help", no_argument, NULL, 'h'}, 1955 {"help", no_argument, NULL, 'h'},
1128 {"version", no_argument, NULL, 'V'}, 1956 {"version", no_argument, NULL, 'V'},
1129 {NULL, no_argument, NULL, 0x0} 1957 {NULL, no_argument, NULL, 0x0}
1130}; 1958};
1131 1959
1132static const char *opts_help[] = { 1960static const char * const opts_help[] = {
1133 "Scan all directories in PATH environment", 1961 "Scan all directories in PATH environment",
1134 "Scan all directories in /etc/ld.so.conf", 1962 "Scan all directories in /etc/ld.so.conf",
1963 "Root directory (use with -l or -p)",
1135 "Scan directories recursively", 1964 "Scan directories recursively",
1136 "Don't recursively cross mount points", 1965 "Don't recursively cross mount points",
1137 "Don't scan symlinks\n", 1966 "Don't scan symlinks",
1967 "Scan archives (.a files)",
1968 "Utilize ld.so.cache information (use with -r/-n)",
1969 "Try and 'fix' bad things (use with -r/-e)",
1970 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1138 "Print PaX markings", 1971 "Print PaX markings",
1139 "Print GNU_STACK/PT_LOAD markings", 1972 "Print GNU_STACK/PT_LOAD markings",
1140 "Print TEXTREL information", 1973 "Print TEXTREL information",
1141 "Print RPATH information", 1974 "Print RPATH information",
1142 "Print NEEDED information", 1975 "Print NEEDED information",
1143 "Resolve NEEDED information (use with -n)",
1144 "Print INTERP information", 1976 "Print INTERP information",
1145 "Print BIND information", 1977 "Print BIND information",
1146 "Print SONAME information", 1978 "Print SONAME information",
1147 "Find a specified symbol", 1979 "Find a specified symbol",
1980 "Find a specified section",
1148 "Find a specified library", 1981 "Find a specified library",
1149 "Use strncmp to match libraries. (use with -N)", 1982 "Use regex matching rather than string compare (use with -s)",
1150 "Locate cause of TEXTREL", 1983 "Locate cause of TEXTREL",
1151 "Print all scanned info (-x -e -t -r -b)\n", 1984 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1985 "Print only ELF files matching numeric bits",
1986 "Print Endianness",
1987 "Print OSABI",
1988 "Print EABI (EM_ARM Only)",
1989 "Print only ELF files matching octal permissions",
1990 "Print ELF file size",
1991 "Print all useful/simple info\n",
1152 "Only output 'bad' things", 1992 "Only output 'bad' things",
1153 "Be verbose (can be specified more than once)", 1993 "Be verbose (can be specified more than once)",
1154 "Use specified format for output", 1994 "Use specified format for output",
1155 "Read input stream from a filename", 1995 "Read input stream from a filename",
1156 "Write output stream to a filename", 1996 "Write output stream to a filename",
1997 "Don't emit color in output",
1157 "Don't display the header", 1998 "Don't display the header",
1158 "Print this help and exit", 1999 "Print this help and exit",
1159 "Print version and exit", 2000 "Print version and exit",
1160 NULL 2001 NULL
1161}; 2002};
1163/* display usage and exit */ 2004/* display usage and exit */
1164static void usage(int status) 2005static void usage(int status)
1165{ 2006{
1166 unsigned long i; 2007 unsigned long i;
1167 printf("* Scan ELF binaries for stuff\n\n" 2008 printf("* Scan ELF binaries for stuff\n\n"
1168 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0); 2009 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1169 printf("Options: -[%s]\n", PARSE_FLAGS); 2010 printf("Options: -[%s]\n", PARSE_FLAGS);
1170 for (i = 0; long_opts[i].name; ++i) 2011 for (i = 0; long_opts[i].name; ++i)
1171 if (long_opts[i].has_arg == no_argument) 2012 if (long_opts[i].has_arg == no_argument)
1172 printf(" -%c, --%-13s* %s\n", long_opts[i].val, 2013 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
2014 long_opts[i].name, opts_help[i]);
2015 else if (long_opts[i].val > '~')
2016 printf(" --%-7s <arg> * %s\n",
1173 long_opts[i].name, opts_help[i]); 2017 long_opts[i].name, opts_help[i]);
1174 else 2018 else
1175 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val, 2019 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
1176 long_opts[i].name, opts_help[i]); 2020 long_opts[i].name, opts_help[i]);
1177 2021
1178 if (status != EXIT_SUCCESS) 2022 puts("\nFor more information, see the scanelf(1) manpage");
1179 exit(status);
1180
1181 puts("\nThe format modifiers for the -F option are:");
1182 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1183 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1184 puts(" i INTERP \tb BIND \ts symbol");
1185 puts(" N library \to Type \tT TEXTRELs");
1186 puts(" S SONAME");
1187 puts(" p filename (with search path removed)");
1188 puts(" f filename (short name/basename)");
1189 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1190
1191 exit(status); 2023 exit(status);
1192} 2024}
1193 2025
1194/* parse command line arguments and preform needed actions */ 2026/* parse command line arguments and preform needed actions */
2027#define do_pax_state(option, flag) \
2028 if (islower(option)) { \
2029 flags &= ~PF_##flag; \
2030 flags |= PF_NO##flag; \
2031 } else { \
2032 flags &= ~PF_NO##flag; \
2033 flags |= PF_##flag; \
2034 }
1195static void parseargs(int argc, char *argv[]) 2035static int parseargs(int argc, char *argv[])
1196{ 2036{
1197 int i; 2037 int i;
1198 char *from_file = NULL; 2038 const char *from_file = NULL;
2039 int ret = 0;
1199 2040
1200 opterr = 0; 2041 opterr = 0;
1201 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 2042 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1202 switch (i) { 2043 switch (i) {
1203 2044
1207 VERSION, __FILE__, __DATE__, rcsid, argv0); 2048 VERSION, __FILE__, __DATE__, rcsid, argv0);
1208 exit(EXIT_SUCCESS); 2049 exit(EXIT_SUCCESS);
1209 break; 2050 break;
1210 case 'h': usage(EXIT_SUCCESS); break; 2051 case 'h': usage(EXIT_SUCCESS); break;
1211 case 'f': 2052 case 'f':
1212 if (from_file) err("Don't specify -f twice"); 2053 if (from_file) warn("You prob don't want to specify -f twice");
1213 from_file = xstrdup(optarg); 2054 from_file = optarg;
2055 break;
2056 case 'E':
2057 match_etypes = optarg;
2058 break;
2059 case 'M':
2060 match_bits = atoi(optarg);
2061 if (match_bits == 0) {
2062 if (strcmp(optarg, "ELFCLASS32") == 0)
2063 match_bits = 32;
2064 if (strcmp(optarg, "ELFCLASS64") == 0)
2065 match_bits = 64;
2066 }
2067 break;
2068 case 'O':
2069 if (sscanf(optarg, "%o", &match_perms) == -1)
2070 match_bits = 0;
1214 break; 2071 break;
1215 case 'o': { 2072 case 'o': {
1216 FILE *fp = NULL;
1217 if ((fp = freopen(optarg, "w", stdout)) == NULL) 2073 if (freopen(optarg, "w", stdout) == NULL)
1218 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 2074 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1219 SET_STDOUT(fp);
1220 break; 2075 break;
1221 } 2076 }
1222 2077 case 'k':
2078 xarraypush_str(find_section_arr, optarg);
2079 break;
1223 case 's': { 2080 case 's': {
1224 if (find_sym) warn("You prob don't want to specify -s twice"); 2081 if (find_sym) warn("You prob don't want to specify -s twice");
1225 find_sym = optarg; 2082 find_sym = optarg;
1226 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1227 sprintf(versioned_symname, "%s@", find_sym);
1228 break; 2083 break;
1229 } 2084 }
1230 case 'N': { 2085 case 'N':
1231 if (find_lib) warn("You prob don't want to specify -N twice"); 2086 xarraypush_str(find_lib_arr, optarg);
1232 find_lib = optarg;
1233 break; 2087 break;
1234 }
1235
1236 case 'F': { 2088 case 'F': {
1237 if (out_format) warn("You prob don't want to specify -F twice"); 2089 if (out_format) warn("You prob don't want to specify -F twice");
1238 out_format = optarg; 2090 out_format = optarg;
1239 break; 2091 break;
1240 } 2092 }
2093 case 'z': {
2094 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
2095 size_t x;
1241 2096
1242 case 'g': gmatch = 1; /* break; any reason we dont breal; here ? */ 2097 for (x = 0; x < strlen(optarg); x++) {
2098 switch (optarg[x]) {
2099 case 'p':
2100 case 'P':
2101 do_pax_state(optarg[x], PAGEEXEC);
2102 break;
2103 case 's':
2104 case 'S':
2105 do_pax_state(optarg[x], SEGMEXEC);
2106 break;
2107 case 'm':
2108 case 'M':
2109 do_pax_state(optarg[x], MPROTECT);
2110 break;
2111 case 'e':
2112 case 'E':
2113 do_pax_state(optarg[x], EMUTRAMP);
2114 break;
2115 case 'r':
2116 case 'R':
2117 do_pax_state(optarg[x], RANDMMAP);
2118 break;
2119 case 'x':
2120 case 'X':
2121 do_pax_state(optarg[x], RANDEXEC);
2122 break;
2123 default:
2124 break;
2125 }
2126 }
2127 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
2128 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
2129 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
2130 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
2131 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
2132 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
2133 setpax = flags;
2134 break;
2135 }
2136 case 'Z': show_size = 1; break;
2137 case 'g': g_match = 1; break;
1243 case 'L': printcache = 1; break; 2138 case 'L': use_ldcache = 1; break;
1244 case 'y': scan_symlink = 0; break; 2139 case 'y': scan_symlink = 0; break;
2140 case 'A': scan_archives = 1; break;
2141 case 'C': color_init(true); break;
1245 case 'B': show_banner = 0; break; 2142 case 'B': show_banner = 0; break;
1246 case 'l': scan_ldpath = 1; break; 2143 case 'l': scan_ldpath = 1; break;
1247 case 'p': scan_envpath = 1; break; 2144 case 'p': scan_envpath = 1; break;
1248 case 'R': dir_recurse = 1; break; 2145 case 'R': dir_recurse = 1; break;
1249 case 'm': dir_crossmount = 0; break; 2146 case 'm': dir_crossmount = 0; break;
2147 case 'X': ++fix_elf; break;
1250 case 'x': show_pax = 1; break; 2148 case 'x': show_pax = 1; break;
1251 case 'e': show_phdr = 1; break; 2149 case 'e': show_phdr = 1; break;
1252 case 't': show_textrel = 1; break; 2150 case 't': show_textrel = 1; break;
1253 case 'r': show_rpath = 1; break; 2151 case 'r': show_rpath = 1; break;
1254 case 'n': show_needed = 1; break; 2152 case 'n': show_needed = 1; break;
1256 case 'b': show_bind = 1; break; 2154 case 'b': show_bind = 1; break;
1257 case 'S': show_soname = 1; break; 2155 case 'S': show_soname = 1; break;
1258 case 'T': show_textrels = 1; break; 2156 case 'T': show_textrels = 1; break;
1259 case 'q': be_quiet = 1; break; 2157 case 'q': be_quiet = 1; break;
1260 case 'v': be_verbose = (be_verbose % 20) + 1; break; 2158 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1261 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break; 2159 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
1262 2160 case 'D': show_endian = 1; break;
2161 case 'I': show_osabi = 1; break;
2162 case 'Y': show_eabi = 1; break;
2163 case 128:
2164 root_fd = open(optarg, O_RDONLY|O_CLOEXEC);
2165 if (root_fd == -1)
2166 err("Could not open root: %s", optarg);
2167 break;
1263 case ':': 2168 case ':':
1264 err("Option missing parameter\n"); 2169 err("Option '%c' is missing parameter", optopt);
1265 case '?': 2170 case '?':
1266 err("Unknown option\n"); 2171 err("Unknown option '%c' or argument missing", optopt);
1267 default: 2172 default:
1268 err("Unhandled option '%c'", i); 2173 err("Unhandled option '%c'; please report this", i);
1269 }
1270 } 2174 }
1271 2175 }
2176 if (show_textrels && be_verbose)
2177 has_objdump = bin_in_path("objdump");
2178 /* flatten arrays for display */
2179 if (array_cnt(find_lib_arr))
2180 find_lib = array_flatten_str(find_lib_arr);
2181 if (array_cnt(find_section_arr))
2182 find_section = array_flatten_str(find_section_arr);
1272 /* let the format option override all other options */ 2183 /* let the format option override all other options */
1273 if (out_format) { 2184 if (out_format) {
1274 show_pax = show_phdr = show_textrel = show_rpath = \ 2185 show_pax = show_phdr = show_textrel = show_rpath = \
1275 show_needed = show_interp = show_bind = show_soname = \ 2186 show_needed = show_interp = show_bind = show_soname = \
1276 show_textrels = 0; 2187 show_textrels = show_perms = show_endian = show_size = \
2188 show_osabi = show_eabi = 0;
1277 for (i = 0; out_format[i]; ++i) { 2189 for (i = 0; out_format[i]; ++i) {
1278 if (!IS_MODIFIER(out_format[i])) continue; 2190 if (!IS_MODIFIER(out_format[i])) continue;
1279 2191
1280 switch (out_format[++i]) { 2192 switch (out_format[++i]) {
2193 case '+': break;
1281 case '%': break; 2194 case '%': break;
1282 case '#': break; 2195 case '#': break;
1283 case 'F': break; 2196 case 'F': break;
1284 case 'p': break; 2197 case 'p': break;
1285 case 'f': break; 2198 case 'f': break;
2199 case 'k': break;
1286 case 's': break; 2200 case 's': break;
1287 case 'N': break; 2201 case 'N': break;
1288 case 'o': break; 2202 case 'o': break;
2203 case 'a': break;
2204 case 'M': break;
2205 case 'Z': show_size = 1; break;
2206 case 'D': show_endian = 1; break;
2207 case 'I': show_osabi = 1; break;
2208 case 'Y': show_eabi = 1; break;
2209 case 'O': show_perms = 1; break;
1289 case 'x': show_pax = 1; break; 2210 case 'x': show_pax = 1; break;
1290 case 'e': show_phdr = 1; break; 2211 case 'e': show_phdr = 1; break;
1291 case 't': show_textrel = 1; break; 2212 case 't': show_textrel = 1; break;
1292 case 'r': show_rpath = 1; break; 2213 case 'r': show_rpath = 1; break;
1293 case 'n': show_needed = 1; break; 2214 case 'n': show_needed = 1; break;
1294 case 'i': show_interp = 1; break; 2215 case 'i': show_interp = 1; break;
1295 case 'b': show_bind = 1; break; 2216 case 'b': show_bind = 1; break;
1296 case 'S': show_soname = 1; break; 2217 case 'S': show_soname = 1; break;
1297 case 'T': show_textrels = 1; break; 2218 case 'T': show_textrels = 1; break;
1298 default: 2219 default:
1299 err("Invalid format specifier '%c' (byte %i)", 2220 err("Invalid format specifier '%c' (byte %i)",
1300 out_format[i], i+1); 2221 out_format[i], i+1);
1301 } 2222 }
1302 } 2223 }
1303 2224
1304 /* construct our default format */ 2225 /* construct our default format */
1305 } else { 2226 } else {
1306 size_t fmt_len = 30; 2227 size_t fmt_len = 30;
1307 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 2228 out_format = xmalloc(sizeof(char) * fmt_len);
2229 *out_format = '\0';
1308 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 2230 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1309 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len); 2231 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
2232 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
2233 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
2234 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
2235 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
2236 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
1310 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len); 2237 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1311 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 2238 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1312 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 2239 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1313 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 2240 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1314 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 2241 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1315 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len); 2242 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1316 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len); 2243 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1317 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len); 2244 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1318 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len); 2245 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
2246 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1319 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len); 2247 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1320 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 2248 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1321 } 2249 }
1322 if (be_verbose > 2) printf("Format: %s\n", out_format); 2250 if (be_verbose > 2) printf("Format: %s\n", out_format);
1323 2251
1324 /* now lets actually do the scanning */ 2252 /* now lets actually do the scanning */
1325 if (scan_ldpath || (show_rpath && be_quiet)) 2253 if (scan_ldpath || use_ldcache)
1326 load_ld_so_conf(); 2254 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
1327 if (scan_ldpath) scanelf_ldpath(); 2255 if (scan_ldpath) scanelf_ldpath();
1328 if (scan_envpath) scanelf_envpath(); 2256 if (scan_envpath) scanelf_envpath();
2257 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
2258 from_file = "-";
1329 if (from_file) { 2259 if (from_file) {
1330 scanelf_from_file(from_file); 2260 scanelf_from_file(from_file);
1331 free(from_file);
1332 from_file = *argv; 2261 from_file = *argv;
1333 } 2262 }
1334 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file) 2263 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1335 err("Nothing to scan !?"); 2264 err("Nothing to scan !?");
1336 while (optind < argc) { 2265 while (optind < argc) {
1337 search_path = argv[optind++]; 2266 search_path = argv[optind++];
1338 scanelf_dir(search_path); 2267 ret = scanelf_dir(search_path);
1339 } 2268 }
1340 2269
1341 /* clean up */ 2270 /* clean up */
1342 if (versioned_symname) free(versioned_symname);
1343 for (i = 0; ldpaths[i]; ++i)
1344 free(ldpaths[i]); 2271 xarrayfree(ldpaths);
2272 xarrayfree(find_lib_arr);
2273 xarrayfree(find_section_arr);
2274 free(find_lib);
2275 free(find_section);
1345 2276
1346 if (ldcache != 0) 2277 if (ldcache != 0)
1347 munmap(ldcache, ldcache_size); 2278 munmap(ldcache, ldcache_size);
1348}
1349
1350
1351
1352/* utility funcs */
1353static char *xstrdup(const char *s)
1354{
1355 char *ret = strdup(s);
1356 if (!ret) err("Could not strdup(): %s", strerror(errno));
1357 return ret; 2279 return ret;
1358} 2280}
1359static void *xmalloc(size_t size)
1360{
1361 void *ret = malloc(size);
1362 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1363 return ret;
1364}
1365static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
1366{
1367 size_t new_len;
1368 2281
1369 new_len = strlen(*dst) + strlen(src); 2282static char **get_split_env(const char *envvar)
1370 if (*curr_len <= new_len) {
1371 *curr_len = new_len + (*curr_len / 2);
1372 *dst = realloc(*dst, *curr_len);
1373 if (!*dst)
1374 err("could not realloc() %li bytes", (unsigned long)*curr_len);
1375 }
1376
1377 if (n)
1378 strncat(*dst, src, n);
1379 else
1380 strcat(*dst, src);
1381}
1382static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1383{ 2283{
1384 static char my_app[2]; 2284 const char *delims = " \t\n";
1385 my_app[0] = append; 2285 char **envvals = NULL;
1386 my_app[1] = '\0'; 2286 char *env, *s;
1387 xstrcat(dst, my_app, curr_len); 2287 int nentry;
1388}
1389 2288
2289 if ((env = getenv(envvar)) == NULL)
2290 return NULL;
1390 2291
2292 env = xstrdup(env);
2293 if (env == NULL)
2294 return NULL;
2295
2296 s = strtok(env, delims);
2297 if (s == NULL) {
2298 free(env);
2299 return NULL;
2300 }
2301
2302 nentry = 0;
2303 while (s != NULL) {
2304 ++nentry;
2305 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
2306 envvals[nentry-1] = s;
2307 s = strtok(NULL, delims);
2308 }
2309 envvals[nentry] = NULL;
2310
2311 /* don't want to free(env) as it contains the memory that backs
2312 * the envvals array of strings */
2313 return envvals;
2314}
2315
2316static void parseenv(void)
2317{
2318 color_init(false);
2319 qa_textrels = get_split_env("QA_TEXTRELS");
2320 qa_execstack = get_split_env("QA_EXECSTACK");
2321 qa_wx_load = get_split_env("QA_WX_LOAD");
2322}
2323
2324#ifdef __PAX_UTILS_CLEANUP
2325static void cleanup(void)
2326{
2327 free(out_format);
2328 free(qa_textrels);
2329 free(qa_execstack);
2330 free(qa_wx_load);
2331}
2332#endif
1391 2333
1392int main(int argc, char *argv[]) 2334int main(int argc, char *argv[])
1393{ 2335{
2336 int ret;
1394 if (argc < 2) 2337 if (argc < 2)
1395 usage(EXIT_FAILURE); 2338 usage(EXIT_FAILURE);
2339 parseenv();
1396 parseargs(argc, argv); 2340 ret = parseargs(argc, argv);
1397 fclose(stdout); 2341 fclose(stdout);
1398#ifdef __BOUNDS_CHECKING_ON 2342#ifdef __PAX_UTILS_CLEANUP
1399 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()"); 2343 cleanup();
2344 warn("The calls to add/delete heap should be off:\n"
2345 "\t- 1 due to the out_buffer not being freed in scanelf_fileat()\n"
2346 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
1400#endif 2347#endif
1401 return EXIT_SUCCESS; 2348 return ret;
1402} 2349}
2350
2351/* Match filename against entries in matchlist, return TRUE
2352 * if the file is listed */
2353static int file_matches_list(const char *filename, char **matchlist)
2354{
2355 char **file;
2356 char *match;
2357 char buf[__PAX_UTILS_PATH_MAX];
2358
2359 if (matchlist == NULL)
2360 return 0;
2361
2362 for (file = matchlist; *file != NULL; file++) {
2363 if (search_path) {
2364 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2365 match = buf;
2366 } else {
2367 match = *file;
2368 }
2369 if (fnmatch(match, filename, 0) == 0)
2370 return 1;
2371 }
2372 return 0;
2373}

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