/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.119 Revision 1.249
1/* 1/*
2 * Copyright 2003-2006 Gentoo Foundation 2 * Copyright 2003-2012 Gentoo Foundation
3 * Distributed under the terms of the GNU General Public License v2 3 * Distributed under the terms of the GNU General Public License v2
4 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.119 2006/02/05 02:25:58 solar Exp $ 4 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.249 2012/11/04 08:23:12 vapier Exp $
5 * 5 *
6 * Copyright 2003-2006 Ned Ludd - <solar@gentoo.org> 6 * Copyright 2003-2012 Ned Ludd - <solar@gentoo.org>
7 * Copyright 2004-2006 Mike Frysinger - <vapier@gentoo.org> 7 * Copyright 2004-2012 Mike Frysinger - <vapier@gentoo.org>
8 */ 8 */
9 9
10static const char rcsid[] = "$Id: scanelf.c,v 1.249 2012/11/04 08:23:12 vapier Exp $";
11const char argv0[] = "scanelf";
12
10#include "paxinc.h" 13#include "paxinc.h"
11 14
12static const char *rcsid = "$Id: scanelf.c,v 1.119 2006/02/05 02:25:58 solar Exp $";
13#define argv0 "scanelf"
14
15#define IS_MODIFIER(c) (c == '%' || c == '#') 15#define IS_MODIFIER(c) (c == '%' || c == '#' || c == '+')
16
17
18 16
19/* prototypes */ 17/* prototypes */
20static int scanelf_elfobj(elfobj *elf); 18static int file_matches_list(const char *filename, char **matchlist);
21static int scanelf_elf(const char *filename, int fd, size_t len);
22static int scanelf_archive(const char *filename, int fd, size_t len);
23static void scanelf_file(const char *filename);
24static void scanelf_dir(const char *path);
25static void scanelf_ldpath(void);
26static void scanelf_envpath(void);
27static void usage(int status);
28static void parseargs(int argc, char *argv[]);
29static char *xstrdup(const char *s);
30static void *xmalloc(size_t size);
31static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n);
32#define xstrcat(dst,src,curr_len) xstrncat(dst,src,curr_len,0)
33static inline void xchrcat(char **dst, const char append, size_t *curr_len);
34 19
35/* variables to control behavior */ 20/* variables to control behavior */
36static char match_etypes[126] = ""; 21static char *match_etypes = NULL;
37static char *ldpaths[256]; 22static array_t _ldpaths = array_init_decl, *ldpaths = &_ldpaths;
38static char scan_ldpath = 0; 23static char scan_ldpath = 0;
39static char scan_envpath = 0; 24static char scan_envpath = 0;
40static char scan_symlink = 1; 25static char scan_symlink = 1;
41static char scan_archives = 0; 26static char scan_archives = 0;
42static char dir_recurse = 0; 27static char dir_recurse = 0;
43static char dir_crossmount = 1; 28static char dir_crossmount = 1;
44static char show_pax = 0; 29static char show_pax = 0;
30static char show_perms = 0;
31static char show_size = 0;
45static char show_phdr = 0; 32static char show_phdr = 0;
46static char show_textrel = 0; 33static char show_textrel = 0;
47static char show_rpath = 0; 34static char show_rpath = 0;
48static char show_needed = 0; 35static char show_needed = 0;
49static char show_interp = 0; 36static char show_interp = 0;
50static char show_bind = 0; 37static char show_bind = 0;
51static char show_soname = 0; 38static char show_soname = 0;
52static char show_textrels = 0; 39static char show_textrels = 0;
53static char show_banner = 1; 40static char show_banner = 1;
41static char show_endian = 0;
42static char show_osabi = 0;
43static char show_eabi = 0;
54static char be_quiet = 0; 44static char be_quiet = 0;
55static char be_verbose = 0; 45static char be_verbose = 0;
56static char be_wewy_wewy_quiet = 0; 46static char be_wewy_wewy_quiet = 0;
57static char *find_sym = NULL, *versioned_symname = NULL; 47static char be_semi_verbose = 0;
48static char *find_sym = NULL;
49static array_t _find_sym_arr = array_init_decl, *find_sym_arr = &_find_sym_arr;
50static array_t _find_sym_regex_arr = array_init_decl, *find_sym_regex_arr = &_find_sym_regex_arr;
58static char *find_lib = NULL; 51static char *find_lib = NULL;
52static array_t _find_lib_arr = array_init_decl, *find_lib_arr = &_find_lib_arr;
53static char *find_section = NULL;
54static array_t _find_section_arr = array_init_decl, *find_section_arr = &_find_section_arr;
59static char *out_format = NULL; 55static char *out_format = NULL;
60static char *search_path = NULL; 56static char *search_path = NULL;
61static char fix_elf = 0; 57static char fix_elf = 0;
62static char gmatch = 0; 58static char g_match = 0;
63static char use_ldcache = 0; 59static char use_ldcache = 0;
60static char use_ldpath = 0;
64 61
62static char **qa_textrels = NULL;
63static char **qa_execstack = NULL;
64static char **qa_wx_load = NULL;
65static int root_fd = AT_FDCWD;
65 66
66caddr_t ldcache = 0; 67static int match_bits = 0;
68static unsigned int match_perms = 0;
69static void *ldcache = NULL;
67size_t ldcache_size = 0; 70static size_t ldcache_size = 0;
71static unsigned long setpax = 0UL;
68 72
73static int has_objdump = 0;
74
75/* find the path to a file by name */
76static int bin_in_path(const char *fname)
77{
78 char fullpath[__PAX_UTILS_PATH_MAX];
79 char *path, *p;
80
81 path = getenv("PATH");
82 if (!path)
83 return 0;
84
85 while ((p = strrchr(path, ':')) != NULL) {
86 snprintf(fullpath, sizeof(fullpath), "%s/%s", p + 1, fname);
87 *p = 0;
88 if (access(fullpath, R_OK) != -1)
89 return 1;
90 }
91
92 return 0;
93}
94
95static FILE *fopenat_r(int dir_fd, const char *path)
96{
97 int fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
98 if (fd == -1)
99 return NULL;
100 return fdopen(fd, "re");
101}
102
103static const char *root_rel_path(const char *path)
104{
105 /*
106 * openat() will ignore the dirfd if path starts with
107 * a /, so consume all of that noise
108 *
109 * XXX: we don't handle relative paths like ../ that
110 * break out of the --root option, but for now, just
111 * don't do that :P.
112 */
113 if (root_fd != AT_FDCWD) {
114 while (*path == '/')
115 ++path;
116 if (*path == '\0')
117 path = ".";
118 }
119
120 return path;
121}
122
69/* sub-funcs for scanelf_file() */ 123/* sub-funcs for scanelf_fileat() */
70static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab) 124static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **str)
71{ 125{
72 /* find the best SHT_DYNSYM and SHT_STRTAB sections */ 126 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
127
128 /* debug sections */
129 void *symtab = elf_findsecbyname(elf, ".symtab");
130 void *strtab = elf_findsecbyname(elf, ".strtab");
131 /* runtime sections */
132 void *dynsym = elf_findsecbyname(elf, ".dynsym");
133 void *dynstr = elf_findsecbyname(elf, ".dynstr");
134
135 /*
136 * If the sections are marked NOBITS, then they don't exist, so we just
137 * skip them. This let's us work sanely with splitdebug ELFs (rather
138 * than spewing a lot of "corrupt ELF" messages later on). In malformed
139 * ELFs, the section might be wrongly set to NOBITS, but screw em.
140 */
73#define GET_SYMTABS(B) \ 141#define GET_SYMTABS(B) \
74 if (elf->elf_class == ELFCLASS ## B) { \ 142 if (elf->elf_class == ELFCLASS ## B) { \
75 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \ 143 Elf ## B ## _Shdr *esymtab = symtab; \
76 /* debug sections */ \ 144 Elf ## B ## _Shdr *estrtab = strtab; \
77 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \ 145 Elf ## B ## _Shdr *edynsym = dynsym; \
78 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \ 146 Elf ## B ## _Shdr *edynstr = dynstr; \
79 /* runtime sections */ \ 147 \
80 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \ 148 if (symtab && EGET(esymtab->sh_type) == SHT_NOBITS) \
81 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \ 149 symtab = NULL; \
150 if (dynsym && EGET(edynsym->sh_type) == SHT_NOBITS) \
151 dynsym = NULL; \
82 if (symtab && dynsym) { \ 152 if (symtab && dynsym) \
83 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \ 153 *sym = (EGET(esymtab->sh_size) > EGET(edynsym->sh_size)) ? symtab : dynsym; \
84 } else { \ 154 else \
85 *sym = (void*)(symtab ? symtab : dynsym); \ 155 *sym = symtab ? symtab : dynsym; \
86 } \ 156 \
157 if (strtab && EGET(estrtab->sh_type) == SHT_NOBITS) \
158 strtab = NULL; \
159 if (dynstr && EGET(edynstr->sh_type) == SHT_NOBITS) \
160 dynstr = NULL; \
87 if (strtab && dynstr) { \ 161 if (strtab && dynstr) \
88 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \ 162 *str = (EGET(estrtab->sh_size) > EGET(edynstr->sh_size)) ? strtab : dynstr; \
89 } else { \ 163 else \
90 *tab = (void*)(strtab ? strtab : dynstr); \ 164 *str = strtab ? strtab : dynstr; \
91 } \
92 } 165 }
93 GET_SYMTABS(32) 166 GET_SYMTABS(32)
94 GET_SYMTABS(64) 167 GET_SYMTABS(64)
168
169 if (*sym && *str)
170 return;
171
172 /*
173 * damn, they're really going to make us work for it huh?
174 * reconstruct the section header info out of the dynamic
175 * tags so we can see what symbols this guy uses at runtime.
176 */
177#define GET_SYMTABS_DT(B) \
178 if (elf->elf_class == ELFCLASS ## B) { \
179 size_t i; \
180 static Elf ## B ## _Shdr sym_shdr, str_shdr; \
181 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
182 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
183 Elf ## B ## _Addr vsym, vstr, vhash, vgnu_hash; \
184 Elf ## B ## _Dyn *dyn; \
185 Elf ## B ## _Off offset; \
186 \
187 /* lookup symbols used at runtime with DT_SYMTAB / DT_STRTAB */ \
188 vsym = vstr = vhash = vgnu_hash = 0; \
189 memset(&sym_shdr, 0, sizeof(sym_shdr)); \
190 memset(&str_shdr, 0, sizeof(str_shdr)); \
191 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
192 if (EGET(phdr[i].p_type) != PT_DYNAMIC) \
193 continue; \
194 \
195 offset = EGET(phdr[i].p_offset); \
196 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
197 continue; \
198 \
199 dyn = DYN ## B (elf->vdata + offset); \
200 while (EGET(dyn->d_tag) != DT_NULL) { \
201 switch (EGET(dyn->d_tag)) { \
202 case DT_SYMTAB: vsym = EGET(dyn->d_un.d_val); break; \
203 case DT_SYMENT: sym_shdr.sh_entsize = dyn->d_un.d_val; break; \
204 case DT_STRTAB: vstr = EGET(dyn->d_un.d_val); break; \
205 case DT_STRSZ: str_shdr.sh_size = dyn->d_un.d_val; break; \
206 case DT_HASH: vhash = EGET(dyn->d_un.d_val); break; \
207 /*case DT_GNU_HASH: vgnu_hash = EGET(dyn->d_un.d_val); break;*/ \
208 } \
209 ++dyn; \
210 } \
211 if (vsym && vstr) \
212 break; \
213 } \
214 if (!vsym || !vstr || !(vhash || vgnu_hash)) \
215 return; \
216 \
217 /* calc offset into the ELF by finding the load addr of the syms */ \
218 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
219 Elf ## B ## _Addr vaddr = EGET(phdr[i].p_vaddr); \
220 Elf ## B ## _Addr filesz = EGET(phdr[i].p_filesz); \
221 offset = EGET(phdr[i].p_offset); \
222 \
223 if (EGET(phdr[i].p_type) != PT_LOAD) \
224 continue; \
225 \
226 if (vhash >= vaddr && vhash < vaddr + filesz) { \
227 /* Scan the hash table to see how many entries we have */ \
228 Elf32_Word max_sym_idx = 0; \
229 Elf32_Word *hashtbl = elf->vdata + offset + (vhash - vaddr); \
230 Elf32_Word b, nbuckets = EGET(hashtbl[0]); \
231 Elf32_Word nchains = EGET(hashtbl[1]); \
232 Elf32_Word *buckets = &hashtbl[2]; \
233 Elf32_Word *chains = &buckets[nbuckets]; \
234 Elf32_Word sym_idx; \
235 \
236 for (b = 0; b < nbuckets; ++b) { \
237 if (!buckets[b]) \
238 continue; \
239 for (sym_idx = buckets[b]; sym_idx < nchains && sym_idx; sym_idx = chains[sym_idx]) \
240 if (max_sym_idx < sym_idx) \
241 max_sym_idx = sym_idx; \
242 } \
243 ESET(sym_shdr.sh_size, sym_shdr.sh_entsize * max_sym_idx); \
244 } \
245 \
246 if (vsym >= vaddr && vsym < vaddr + filesz) { \
247 ESET(sym_shdr.sh_offset, offset + (vsym - vaddr)); \
248 *sym = &sym_shdr; \
249 } \
250 \
251 if (vstr >= vaddr && vstr < vaddr + filesz) { \
252 ESET(str_shdr.sh_offset, offset + (vstr - vaddr)); \
253 *str = &str_shdr; \
254 } \
255 } \
256 }
257 GET_SYMTABS_DT(32)
258 GET_SYMTABS_DT(64)
95} 259}
260
96static char *scanelf_file_pax(elfobj *elf, char *found_pax) 261static char *scanelf_file_pax(elfobj *elf, char *found_pax)
97{ 262{
98 static char ret[7]; 263 static char ret[7];
99 unsigned long i, shown; 264 unsigned long i, shown;
100 265
109 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 274 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
110 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 275 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
111 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 276 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
112 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \ 277 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
113 continue; \ 278 continue; \
114 if (be_quiet && (EGET(phdr[i].p_flags) == 10240)) \ 279 if (fix_elf && setpax) { \
280 /* set the paxctl flags */ \
281 ESET(phdr[i].p_flags, setpax); \
282 } \
283 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
115 continue; \ 284 continue; \
116 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \ 285 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
117 *found_pax = 1; \ 286 *found_pax = 1; \
118 ++shown; \ 287 ++shown; \
119 break; \ 288 break; \
120 } \ 289 } \
121 } 290 }
122 SHOW_PAX(32) 291 SHOW_PAX(32)
123 SHOW_PAX(64) 292 SHOW_PAX(64)
124 } 293 }
294
295 /* Note: We do not support setting EI_PAX if not PT_PAX_FLAGS
296 * was found. This is known to break ELFs on glibc systems,
297 * and mainline PaX has deprecated use of this for a long time.
298 * We could support changing PT_GNU_STACK, but that doesn't
299 * seem like it's worth the effort. #411919
300 */
125 301
126 /* fall back to EI_PAX if no PT_PAX was found */ 302 /* fall back to EI_PAX if no PT_PAX was found */
127 if (!*ret) { 303 if (!*ret) {
128 static char *paxflags; 304 static char *paxflags;
129 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf)); 305 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
163 uint32_t flags, check_flags; \ 339 uint32_t flags, check_flags; \
164 if (elf->phdr != NULL) { \ 340 if (elf->phdr != NULL) { \
165 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 341 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
166 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \ 342 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
167 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \ 343 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
344 if (multi_stack++) \
168 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \ 345 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
346 if (file_matches_list(elf->filename, qa_execstack)) \
347 continue; \
169 found = found_phdr; \ 348 found = found_phdr; \
170 offset = 0; \ 349 offset = 0; \
171 check_flags = PF_X; \ 350 check_flags = PF_X; \
172 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \ 351 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
352 if (multi_relro++) \
173 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \ 353 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
174 found = found_relro; \ 354 found = found_relro; \
175 offset = 4; \ 355 offset = 4; \
176 check_flags = PF_X; \ 356 check_flags = PF_X; \
177 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \ 357 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
178 if (ehdr->e_type == ET_DYN || ehdr->e_type == ET_EXEC) \ 358 if (EGET(ehdr->e_type) == ET_DYN || EGET(ehdr->e_type) == ET_EXEC) \
359 if (multi_load++ > max_pt_load) \
179 if (multi_load++ > max_pt_load) warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \ 360 warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
361 if (file_matches_list(elf->filename, qa_wx_load)) \
362 continue; \
180 found = found_load; \ 363 found = found_load; \
181 offset = 8; \ 364 offset = 8; \
182 check_flags = PF_W|PF_X; \ 365 check_flags = PF_W|PF_X; \
183 } else \ 366 } else \
184 continue; \ 367 continue; \
185 flags = EGET(phdr[i].p_flags); \ 368 flags = EGET(phdr[i].p_flags); \
186 if (be_quiet && ((flags & check_flags) != check_flags)) \ 369 if (be_quiet && ((flags & check_flags) != check_flags)) \
187 continue; \ 370 continue; \
188 if (fix_elf && ((flags & PF_X) != flags)) { \ 371 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
189 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \ 372 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
190 ret[3] = ret[7] = '!'; \ 373 ret[3] = ret[7] = '!'; \
191 flags = EGET(phdr[i].p_flags); \ 374 flags = EGET(phdr[i].p_flags); \
192 } \ 375 } \
193 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \ 376 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
197 } else if (elf->shdr != NULL) { \ 380 } else if (elf->shdr != NULL) { \
198 /* no program headers which means this is prob an object file */ \ 381 /* no program headers which means this is prob an object file */ \
199 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \ 382 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
200 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \ 383 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
201 char *str; \ 384 char *str; \
202 if ((void*)strtbl > (void*)elf->data_end) \ 385 if ((void*)strtbl > elf->data_end) \
203 goto skip_this_shdr##B; \ 386 goto skip_this_shdr##B; \
204 check_flags = SHF_WRITE|SHF_EXECINSTR; \ 387 check_flags = SHF_WRITE|SHF_EXECINSTR; \
205 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \ 388 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
206 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \ 389 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
207 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \ 390 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
221 break; \ 404 break; \
222 } \ 405 } \
223 } \ 406 } \
224 skip_this_shdr##B: \ 407 skip_this_shdr##B: \
225 if (!multi_stack) { \ 408 if (!multi_stack) { \
409 if (file_matches_list(elf->filename, qa_execstack)) \
410 return NULL; \
226 *found_phdr = 1; \ 411 *found_phdr = 1; \
227 shown = 1; \ 412 shown = 1; \
228 memcpy(ret, "!WX", 3); \ 413 memcpy(ret, "!WX", 3); \
229 } \ 414 } \
230 } \ 415 } \
235 if (be_wewy_wewy_quiet || (be_quiet && !shown)) 420 if (be_wewy_wewy_quiet || (be_quiet && !shown))
236 return NULL; 421 return NULL;
237 else 422 else
238 return ret; 423 return ret;
239} 424}
425
426/*
427 * See if this ELF contains a DT_TEXTREL tag in any of its
428 * PT_DYNAMIC sections.
429 */
240static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 430static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
241{ 431{
242 static const char *ret = "TEXTREL"; 432 static const char *ret = "TEXTREL";
243 unsigned long i; 433 unsigned long i;
244 434
245 if (!show_textrel && !show_textrels) return NULL; 435 if (!show_textrel && !show_textrels) return NULL;
436
437 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
246 438
247 if (elf->phdr) { 439 if (elf->phdr) {
248#define SHOW_TEXTREL(B) \ 440#define SHOW_TEXTREL(B) \
249 if (elf->elf_class == ELFCLASS ## B) { \ 441 if (elf->elf_class == ELFCLASS ## B) { \
250 Elf ## B ## _Dyn *dyn; \ 442 Elf ## B ## _Dyn *dyn; \
251 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 443 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
252 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 444 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
253 Elf ## B ## _Off offset; \ 445 Elf ## B ## _Off offset; \
254 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 446 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
255 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 447 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
256 offset = EGET(phdr[i].p_offset); \ 448 offset = EGET(phdr[i].p_offset); \
257 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 449 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
258 dyn = DYN ## B (elf->data + offset); \ 450 dyn = DYN ## B (elf->vdata + offset); \
259 while (EGET(dyn->d_tag) != DT_NULL) { \ 451 while (EGET(dyn->d_tag) != DT_NULL) { \
260 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \ 452 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
261 *found_textrel = 1; \ 453 *found_textrel = 1; \
262 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \ 454 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
263 return (be_wewy_wewy_quiet ? NULL : ret); \ 455 return (be_wewy_wewy_quiet ? NULL : ret); \
272 if (be_quiet || be_wewy_wewy_quiet) 464 if (be_quiet || be_wewy_wewy_quiet)
273 return NULL; 465 return NULL;
274 else 466 else
275 return " - "; 467 return " - ";
276} 468}
469
470/*
471 * Scan the .text section to see if there are any relocations in it.
472 * Should rewrite this to check PT_LOAD sections that are marked
473 * Executable rather than the section named '.text'.
474 */
277static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel) 475static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
278{ 476{
279 unsigned long s, r, rmax; 477 unsigned long s, r, rmax;
280 void *symtab_void, *strtab_void, *text_void; 478 void *symtab_void, *strtab_void, *text_void;
281 479
302 Elf ## B ## _Rela *rela; \ 500 Elf ## B ## _Rela *rela; \
303 /* search the section headers for relocations */ \ 501 /* search the section headers for relocations */ \
304 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \ 502 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
305 uint32_t sh_type = EGET(shdr[s].sh_type); \ 503 uint32_t sh_type = EGET(shdr[s].sh_type); \
306 if (sh_type == SHT_REL) { \ 504 if (sh_type == SHT_REL) { \
307 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \ 505 rel = REL ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
308 rela = NULL; \ 506 rela = NULL; \
309 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \ 507 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
310 } else if (sh_type == SHT_RELA) { \ 508 } else if (sh_type == SHT_RELA) { \
311 rel = NULL; \ 509 rel = NULL; \
312 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \ 510 rela = RELA ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
313 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \ 511 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
314 } else \ 512 } else \
315 continue; \ 513 continue; \
316 /* now see if any of the relocs are in the .text */ \ 514 /* now see if any of the relocs are in the .text */ \
317 for (r = 0; r < rmax; ++r) { \ 515 for (r = 0; r < rmax; ++r) { \
332 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \ 530 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
333 if (be_verbose <= 2) continue; \ 531 if (be_verbose <= 2) continue; \
334 } else \ 532 } else \
335 *found_textrels = 1; \ 533 *found_textrels = 1; \
336 /* locate this relocation symbol name */ \ 534 /* locate this relocation symbol name */ \
337 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 535 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
338 if ((void*)sym > (void*)elf->data_end) { \ 536 if ((void*)sym > elf->data_end) { \
339 warn("%s: corrupt ELF symbol", elf->filename); \ 537 warn("%s: corrupt ELF symbol", elf->filename); \
340 continue; \ 538 continue; \
341 } \ 539 } \
342 sym_max = ELF ## B ## _R_SYM(r_info); \ 540 sym_max = ELF ## B ## _R_SYM(r_info); \
343 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \ 541 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
346 sym = NULL; \ 544 sym = NULL; \
347 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 545 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
348 /* show the raw details about this reloc */ \ 546 /* show the raw details about this reloc */ \
349 printf(" %s: ", elf->base_filename); \ 547 printf(" %s: ", elf->base_filename); \
350 if (sym && sym->st_name) \ 548 if (sym && sym->st_name) \
351 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \ 549 printf("%s", elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
352 else \ 550 else \
353 printf("(memory/fake?)"); \ 551 printf("(memory/data?)"); \
354 printf(" [0x%lX]", (unsigned long)r_offset); \ 552 printf(" [0x%lX]", (unsigned long)r_offset); \
355 /* now try to find the closest symbol that this rel is probably in */ \ 553 /* now try to find the closest symbol that this rel is probably in */ \
356 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 554 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
357 func = NULL; \ 555 func = NULL; \
358 offset_tmp = 0; \ 556 offset_tmp = 0; \
359 while (sym_max--) { \ 557 while (sym_max--) { \
360 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \ 558 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
361 func = sym; \ 559 func = sym; \
362 offset_tmp = EGET(sym->st_value); \ 560 offset_tmp = EGET(sym->st_value); \
363 } \ 561 } \
364 ++sym; \ 562 ++sym; \
365 } \ 563 } \
366 printf(" in "); \ 564 printf(" in "); \
367 if (func && func->st_name) \ 565 if (func && func->st_name) { \
368 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \ 566 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
567 if (r_offset > EGET(func->st_size)) \
568 printf("(optimized out: previous %s)", func_name); \
369 else \ 569 else \
370 printf("(NULL: fake?)"); \ 570 printf("%s", func_name); \
571 } else \
572 printf("(optimized out)"); \
371 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \ 573 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
574 if (be_verbose && has_objdump) { \
575 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
576 char *sysbuf; \
577 size_t syslen; \
578 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"; \
579 syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
580 sysbuf = xmalloc(syslen); \
581 if (end_addr < r_offset) \
582 /* not uncommon when things are optimized out */ \
583 end_addr = r_offset + 0x100; \
584 snprintf(sysbuf, syslen, sysfmt, \
585 (unsigned long)offset_tmp, \
586 (unsigned long)end_addr, \
587 elf->filename, \
588 (unsigned long)r_offset); \
589 fflush(stdout); \
590 if (system(sysbuf)) /* don't care */; \
591 fflush(stdout); \
592 free(sysbuf); \
593 } \
372 } \ 594 } \
373 } } 595 } }
374 SHOW_TEXTRELS(32) 596 SHOW_TEXTRELS(32)
375 SHOW_TEXTRELS(64) 597 SHOW_TEXTRELS(64)
376 } 598 }
378 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename); 600 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
379 601
380 return NULL; 602 return NULL;
381} 603}
382 604
383static void rpath_security_checks(elfobj *, char *, const char *);
384static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type) 605static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
385{ 606{
386 struct stat st; 607 struct stat st;
387 switch (*item) { 608 switch (*item) {
388 case '/': break; 609 case '/': break;
394 warnf("Security problem NULL %s in %s", dt_type, elf->filename); 615 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
395 break; 616 break;
396 case '$': 617 case '$':
397 if (fstat(elf->fd, &st) != -1) 618 if (fstat(elf->fd, &st) != -1)
398 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID)) 619 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
399 warnf("Security problem with %s='%s' in %s with mode set of %o", 620 warnf("Security problem with %s='%s' in %s with mode set of %o",
400 dt_type, item, elf->filename, st.st_mode & 07777); 621 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
401 break; 622 break;
402 default: 623 default:
403 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename); 624 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
404 break; 625 break;
405 } 626 }
406} 627}
407static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len) 628static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
408{ 629{
409 unsigned long i, s; 630 unsigned long i;
410 char *rpath, *runpath, **r; 631 char *rpath, *runpath, **r;
411 void *strtbl_void; 632 void *strtbl_void;
412 633
413 if (!show_rpath) return; 634 if (!show_rpath) return;
414 635
425 Elf ## B ## _Off offset; \ 646 Elf ## B ## _Off offset; \
426 Elf ## B ## _Xword word; \ 647 Elf ## B ## _Xword word; \
427 /* Scan all the program headers */ \ 648 /* Scan all the program headers */ \
428 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 649 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
429 /* Just scan dynamic headers */ \ 650 /* Just scan dynamic headers */ \
430 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 651 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
431 offset = EGET(phdr[i].p_offset); \ 652 offset = EGET(phdr[i].p_offset); \
432 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 653 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
433 /* Just scan dynamic RPATH/RUNPATH headers */ \ 654 /* Just scan dynamic RPATH/RUNPATH headers */ \
434 dyn = DYN ## B (elf->data + offset); \ 655 dyn = DYN ## B (elf->vdata + offset); \
435 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \ 656 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
436 if (word == DT_RPATH) { \ 657 if (word == DT_RPATH) { \
437 r = &rpath; \ 658 r = &rpath; \
438 } else if (word == DT_RUNPATH) { \ 659 } else if (word == DT_RUNPATH) { \
439 r = &runpath; \ 660 r = &runpath; \
443 } \ 664 } \
444 /* Verify the memory is somewhat sane */ \ 665 /* Verify the memory is somewhat sane */ \
445 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 666 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
446 if (offset < (Elf ## B ## _Off)elf->len) { \ 667 if (offset < (Elf ## B ## _Off)elf->len) { \
447 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \ 668 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
448 *r = (char*)(elf->data + offset); \ 669 *r = elf->data + offset; \
449 /* cache the length in case we need to nuke this section later on */ \ 670 /* cache the length in case we need to nuke this section later on */ \
450 if (fix_elf) \ 671 if (fix_elf) \
451 offset = strlen(*r); \ 672 offset = strlen(*r); \
452 /* If quiet, don't output paths in ld.so.conf */ \ 673 /* If quiet, don't output paths in ld.so.conf */ \
453 if (be_quiet) { \ 674 if (be_quiet) { \
459 /* scan each path in : delimited list */ \ 680 /* scan each path in : delimited list */ \
460 while (start) { \ 681 while (start) { \
461 rpath_security_checks(elf, start, get_elfdtype(word)); \ 682 rpath_security_checks(elf, start, get_elfdtype(word)); \
462 end = strchr(start, ':'); \ 683 end = strchr(start, ':'); \
463 len = (end ? abs(end - start) : strlen(start)); \ 684 len = (end ? abs(end - start) : strlen(start)); \
464 if (use_ldcache) \ 685 if (use_ldcache) { \
465 for (s = 0; ldpaths[s]; ++s) \ 686 size_t n; \
687 const char *ldpath; \
688 array_for_each(ldpaths, n, ldpath) \
466 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \ 689 if (!strncmp(ldpath, start, len) && !ldpath[len]) { \
467 *r = end; \ 690 *r = end; \
468 /* corner case ... if RPATH reads "/usr/lib:", we want \ 691 /* corner case ... if RPATH reads "/usr/lib:", we want \
469 * to show ':' rather than '' */ \ 692 * to show ':' rather than '' */ \
470 if (end && end[1] != '\0') \ 693 if (end && end[1] != '\0') \
471 (*r)++; \ 694 (*r)++; \
472 break; \ 695 break; \
473 } \ 696 } \
697 } \
474 if (!*r || !end) \ 698 if (!*r || !end) \
475 break; \ 699 break; \
476 else \ 700 else \
477 start = start + len + 1; \ 701 start = start + len + 1; \
478 } \ 702 } \
563#define FLAG_S390_LIB64 0x0400 787#define FLAG_S390_LIB64 0x0400
564#define FLAG_POWERPC_LIB64 0x0500 788#define FLAG_POWERPC_LIB64 0x0500
565#define FLAG_MIPS64_LIBN32 0x0600 789#define FLAG_MIPS64_LIBN32 0x0600
566#define FLAG_MIPS64_LIBN64 0x0700 790#define FLAG_MIPS64_LIBN64 0x0700
567 791
568static char *lookup_cache_lib(elfobj *, char *); 792#if defined(__GLIBC__) || defined(__UCLIBC__)
793
569static char *lookup_cache_lib(elfobj *elf, char *fname) 794static char *lookup_cache_lib(elfobj *elf, const char *fname)
570{ 795{
571 int fd = 0; 796 int fd;
572 char *strs; 797 char *strs;
573 static char buf[__PAX_UTILS_PATH_MAX] = ""; 798 static char buf[__PAX_UTILS_PATH_MAX] = "";
574 const char *cachefile = "/etc/ld.so.cache"; 799 const char *cachefile = root_rel_path("/etc/ld.so.cache");
575 struct stat st; 800 struct stat st;
576 801
577 typedef struct { 802 typedef struct {
578 char magic[LDSO_CACHE_MAGIC_LEN]; 803 char magic[LDSO_CACHE_MAGIC_LEN];
579 char version[LDSO_CACHE_VER_LEN]; 804 char version[LDSO_CACHE_VER_LEN];
589 libentry_t *libent; 814 libentry_t *libent;
590 815
591 if (fname == NULL) 816 if (fname == NULL)
592 return NULL; 817 return NULL;
593 818
594 if (ldcache == 0) { 819 if (ldcache == NULL) {
595 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1) 820 if (fstatat(root_fd, cachefile, &st, 0))
821 return NULL;
822
823 fd = openat(root_fd, cachefile, O_RDONLY);
824 if (fd == -1)
596 return NULL; 825 return NULL;
597 826
598 /* cache these values so we only map/unmap the cache file once */ 827 /* cache these values so we only map/unmap the cache file once */
599 ldcache_size = st.st_size; 828 ldcache_size = st.st_size;
600 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0); 829 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
601
602 close(fd); 830 close(fd);
603 831
604 if (ldcache == (caddr_t)-1) { 832 if (ldcache == MAP_FAILED) {
605 ldcache = 0; 833 ldcache = NULL;
606 return NULL; 834 return NULL;
607 } 835 }
608 836
609 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN)) 837 if (memcmp(header->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN) ||
838 memcmp(header->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
839 {
840 munmap(ldcache, ldcache_size);
841 ldcache = NULL;
610 return NULL; 842 return NULL;
611 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
612 return NULL;
613 } 843 }
844 } else
845 header = ldcache;
614 846
615 header = (header_t *) ldcache;
616 libent = (libentry_t *) (ldcache + sizeof(header_t)); 847 libent = ldcache + sizeof(header_t);
617 strs = (char *) &libent[header->nlibs]; 848 strs = (char *) &libent[header->nlibs];
618 849
619 for (fd = 0; fd < header->nlibs; fd++) { 850 for (fd = 0; fd < header->nlibs; ++fd) {
620 /* this should be more fine grained, but for now we assume that 851 /* This should be more fine grained, but for now we assume that
621 * diff arches will not be cached together. and we ignore the 852 * diff arches will not be cached together, and we ignore the
622 * the different multilib mips cases. */ 853 * the different multilib mips cases.
854 */
623 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK)) 855 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
624 continue; 856 continue;
625 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK)) 857 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
626 continue; 858 continue;
627 859
628 if (strcmp(fname, strs + libent[fd].sooffset) != 0) 860 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
629 continue; 861 continue;
862
863 /* Return first hit because that is how the ldso rolls */
630 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf)); 864 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
865 break;
631 } 866 }
867
632 return buf; 868 return buf;
633} 869}
634 870
871#elif defined(__NetBSD__)
872static char *lookup_cache_lib(elfobj *elf, const char *fname)
873{
874 static char buf[__PAX_UTILS_PATH_MAX] = "";
875 static struct stat st;
876 size_t n;
877 char *ldpath;
878
879 array_for_each(ldpath, n, ldpath) {
880 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", ldpath, fname) >= sizeof(buf))
881 continue; /* if the pathname is too long, or something went wrong, ignore */
882
883 if (stat(buf, &st) != 0)
884 continue; /* if the lib doesn't exist in *ldpath, look further */
885
886 /* NetBSD doesn't actually do sanity checks, it just loads the file
887 * and if that doesn't work, continues looking in other directories.
888 * This cannot easily be safely emulated, unfortunately. For now,
889 * just assume that if it exists, it's a valid library. */
890
891 return buf;
892 }
893
894 /* not found in any path */
895 return NULL;
896}
897#else
898#ifdef __ELF__
899#warning Cache support not implemented for your target
900#endif
901static char *lookup_cache_lib(elfobj *elf, const char *fname)
902{
903 return NULL;
904}
905#endif
906
907static char *lookup_config_lib(elfobj *elf, char *fname)
908{
909 static char buf[__PAX_UTILS_PATH_MAX] = "";
910 const char *ldpath;
911 size_t n;
912
913 array_for_each(ldpaths, n, ldpath) {
914 snprintf(buf, sizeof(buf), "%s/%s", root_rel_path(ldpath), fname);
915 if (faccessat(root_fd, buf, F_OK, AT_SYMLINK_NOFOLLOW) == 0)
916 return buf;
917 }
918
919 return NULL;
920}
635 921
636static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len) 922static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
637{ 923{
638 unsigned long i; 924 unsigned long i;
639 char *needed; 925 char *needed;
640 void *strtbl_void; 926 void *strtbl_void;
641 char *p; 927 char *p;
642 928
929 /*
930 * -n -> op==0 -> print all
931 * -N -> op==1 -> print requested
932 */
643 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL; 933 if ((op == 0 && !show_needed) || (op == 1 && !find_lib))
934 return NULL;
644 935
645 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 936 strtbl_void = elf_findsecbyname(elf, ".dynstr");
646 937
647 if (elf->phdr && strtbl_void) { 938 if (elf->phdr && strtbl_void) {
648#define SHOW_NEEDED(B) \ 939#define SHOW_NEEDED(B) \
650 Elf ## B ## _Dyn *dyn; \ 941 Elf ## B ## _Dyn *dyn; \
651 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 942 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
652 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 943 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
653 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 944 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
654 Elf ## B ## _Off offset; \ 945 Elf ## B ## _Off offset; \
946 size_t matched = 0; \
947 /* Walk all the program headers to find the PT_DYNAMIC */ \
655 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 948 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
656 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 949 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) \
950 continue; \
657 offset = EGET(phdr[i].p_offset); \ 951 offset = EGET(phdr[i].p_offset); \
658 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 952 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
953 continue; \
954 /* Walk all the dynamic tags to find NEEDED entries */ \
659 dyn = DYN ## B (elf->data + offset); \ 955 dyn = DYN ## B (elf->vdata + offset); \
660 while (EGET(dyn->d_tag) != DT_NULL) { \ 956 while (EGET(dyn->d_tag) != DT_NULL) { \
661 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 957 if (EGET(dyn->d_tag) == DT_NEEDED) { \
662 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 958 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
663 if (offset >= (Elf ## B ## _Off)elf->len) { \ 959 if (offset >= (Elf ## B ## _Off)elf->len) { \
664 ++dyn; \ 960 ++dyn; \
665 continue; \ 961 continue; \
666 } \ 962 } \
667 needed = (char*)(elf->data + offset); \ 963 needed = elf->data + offset; \
668 if (op == 0) { \ 964 if (op == 0) { \
965 /* -n -> print all entries */ \
669 if (!be_wewy_wewy_quiet) { \ 966 if (!be_wewy_wewy_quiet) { \
670 if (*found_needed) xchrcat(ret, ',', ret_len); \ 967 if (*found_needed) xchrcat(ret, ',', ret_len); \
671 if (use_ldcache) \ 968 if (use_ldpath) { \
969 if ((p = lookup_config_lib(elf, needed)) != NULL) \
970 needed = p; \
971 } else if (use_ldcache) { \
672 if ((p = lookup_cache_lib(elf, needed)) != NULL) \ 972 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
673 needed = p; \ 973 needed = p; \
974 } \
674 xstrcat(ret, needed, ret_len); \ 975 xstrcat(ret, needed, ret_len); \
675 } \ 976 } \
676 *found_needed = 1; \ 977 *found_needed = 1; \
677 } else { \ 978 } else { \
678 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \ 979 /* -N -> print matching entries */ \
980 size_t n; \
981 const char *find_lib_name; \
982 \
983 array_for_each(find_lib_arr, n, find_lib_name) { \
984 int invert = 1; \
985 if (find_lib_name[0] == '!') \
986 invert = 0, ++find_lib_name; \
987 if (!strcmp(find_lib_name, needed) == invert) \
988 ++matched; \
989 } \
990 \
991 if (matched == array_cnt(find_lib_arr)) { \
679 *found_lib = 1; \ 992 *found_lib = 1; \
680 return (be_wewy_wewy_quiet ? NULL : needed); \ 993 return (be_wewy_wewy_quiet ? NULL : find_lib); \
681 } \ 994 } \
682 } \ 995 } \
683 } \ 996 } \
684 ++dyn; \ 997 ++dyn; \
685 } \ 998 } \
714} 1027}
715static char *scanelf_file_bind(elfobj *elf, char *found_bind) 1028static char *scanelf_file_bind(elfobj *elf, char *found_bind)
716{ 1029{
717 unsigned long i; 1030 unsigned long i;
718 struct stat s; 1031 struct stat s;
1032 char dynamic = 0;
719 1033
720 if (!show_bind) return NULL; 1034 if (!show_bind) return NULL;
721 if (!elf->phdr) return NULL; 1035 if (!elf->phdr) return NULL;
722 1036
723#define SHOW_BIND(B) \ 1037#define SHOW_BIND(B) \
725 Elf ## B ## _Dyn *dyn; \ 1039 Elf ## B ## _Dyn *dyn; \
726 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 1040 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
727 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 1041 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
728 Elf ## B ## _Off offset; \ 1042 Elf ## B ## _Off offset; \
729 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 1043 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
730 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 1044 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1045 dynamic = 1; \
731 offset = EGET(phdr[i].p_offset); \ 1046 offset = EGET(phdr[i].p_offset); \
732 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 1047 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
733 dyn = DYN ## B (elf->data + offset); \ 1048 dyn = DYN ## B (elf->vdata + offset); \
734 while (EGET(dyn->d_tag) != DT_NULL) { \ 1049 while (EGET(dyn->d_tag) != DT_NULL) { \
735 if (EGET(dyn->d_tag) == DT_BIND_NOW || \ 1050 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
736 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \ 1051 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
737 { \ 1052 { \
738 if (be_quiet) return NULL; \ 1053 if (be_quiet) return NULL; \
746 SHOW_BIND(32) 1061 SHOW_BIND(32)
747 SHOW_BIND(64) 1062 SHOW_BIND(64)
748 1063
749 if (be_wewy_wewy_quiet) return NULL; 1064 if (be_wewy_wewy_quiet) return NULL;
750 1065
1066 /* don't output anything if quiet mode and the ELF is static or not setuid */
751 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) { 1067 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
752 return NULL; 1068 return NULL;
753 } else { 1069 } else {
754 *found_bind = 1; 1070 *found_bind = 1;
755 return (char *) "LAZY"; 1071 return (char *)(dynamic ? "LAZY" : "STATIC");
756 } 1072 }
757} 1073}
758static char *scanelf_file_soname(elfobj *elf, char *found_soname) 1074static char *scanelf_file_soname(elfobj *elf, char *found_soname)
759{ 1075{
760 unsigned long i; 1076 unsigned long i;
772 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 1088 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
773 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 1089 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
774 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 1090 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
775 Elf ## B ## _Off offset; \ 1091 Elf ## B ## _Off offset; \
776 /* only look for soname in shared objects */ \ 1092 /* only look for soname in shared objects */ \
777 if (ehdr->e_type != ET_DYN) \ 1093 if (EGET(ehdr->e_type) != ET_DYN) \
778 return NULL; \ 1094 return NULL; \
779 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 1095 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
780 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 1096 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
781 offset = EGET(phdr[i].p_offset); \ 1097 offset = EGET(phdr[i].p_offset); \
782 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 1098 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
783 dyn = DYN ## B (elf->data + offset); \ 1099 dyn = DYN ## B (elf->vdata + offset); \
784 while (EGET(dyn->d_tag) != DT_NULL) { \ 1100 while (EGET(dyn->d_tag) != DT_NULL) { \
785 if (EGET(dyn->d_tag) == DT_SONAME) { \ 1101 if (EGET(dyn->d_tag) == DT_SONAME) { \
786 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 1102 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
787 if (offset >= (Elf ## B ## _Off)elf->len) { \ 1103 if (offset >= (Elf ## B ## _Off)elf->len) { \
788 ++dyn; \ 1104 ++dyn; \
789 continue; \ 1105 continue; \
790 } \ 1106 } \
791 soname = (char*)(elf->data + offset); \ 1107 soname = elf->data + offset; \
792 *found_soname = 1; \ 1108 *found_soname = 1; \
793 return (be_wewy_wewy_quiet ? NULL : soname); \ 1109 return (be_wewy_wewy_quiet ? NULL : soname); \
794 } \ 1110 } \
795 ++dyn; \ 1111 ++dyn; \
796 } \ 1112 } \
799 SHOW_SONAME(64) 1115 SHOW_SONAME(64)
800 } 1116 }
801 1117
802 return NULL; 1118 return NULL;
803} 1119}
1120
1121/*
1122 * We support the symbol form:
1123 * [%[modifiers]%][[+-]<symbol name>][,[.....]]
1124 * If the symbol name is empty, then all symbols are matched.
1125 * If the symbol name is a glob ("*"), then all symbols are dumped (debug).
1126 * Do not rely on this output format at all.
1127 * Otherwise the symbol name is used to search (either regex or string compare).
1128 * If the first char of the symbol name is a plus ("+"), then only match
1129 * defined symbols. If it's a minus ("-"), only match undefined symbols.
1130 * Putting modifiers in between the percent signs allows for more in depth
1131 * filters. There are groups of modifiers. If you don't specify a member
1132 * of a group, then all types in that group are matched. The current
1133 * groups and their types are:
1134 * STT group: STT_NOTYPE:n STT_OBJECT:o STT_FUNC:f STT_FILE:F
1135 * STB group: STB_LOCAL:l STB_GLOBAL:g STB_WEAK:w
1136 * SHN group: SHN_UNDEF:u SHN_ABS:a SHN_COMMON:c {defined}:d
1137 * The "defined" value in the SHN group does not correspond to a SHN_xxx define.
1138 * You can search for multiple symbols at once by seperating with a comma (",").
1139 *
1140 * Some examples:
1141 * ELFs with a weak function "foo":
1142 * scanelf -s %wf%foo <ELFs>
1143 * ELFs that define the symbol "main":
1144 * scanelf -s +main <ELFs>
1145 * scanelf -s %d%main <ELFs>
1146 * ELFs that refer to the undefined symbol "brk":
1147 * scanelf -s -brk <ELFs>
1148 * scanelf -s %u%brk <ELFs>
1149 * All global defined objects in an ELF:
1150 * scanelf -s %ogd% <ELF>
1151 */
1152static void
1153scanelf_match_symname(elfobj *elf, char *found_sym, char **ret, size_t *ret_len, const char *symname,
1154 unsigned int stt, unsigned int stb, unsigned int shn, unsigned long size)
1155{
1156 const char *this_sym;
1157 size_t n;
1158
1159 array_for_each(find_sym_arr, n, this_sym) {
1160 bool inc_notype, inc_object, inc_func, inc_file,
1161 inc_local, inc_global, inc_weak,
1162 inc_def, inc_undef, inc_abs, inc_common;
1163
1164 /* symbol selection! */
1165 inc_notype = inc_object = inc_func = inc_file = \
1166 inc_local = inc_global = inc_weak = \
1167 inc_def = inc_undef = inc_abs = inc_common = \
1168 (*this_sym != '%');
1169
1170 /* parse the contents of %...% */
1171 if (!inc_notype) {
1172 while (*(this_sym++)) {
1173 if (*this_sym == '%') {
1174 ++this_sym;
1175 break;
1176 }
1177 switch (*this_sym) {
1178 case 'n': inc_notype = true; break;
1179 case 'o': inc_object = true; break;
1180 case 'f': inc_func = true; break;
1181 case 'F': inc_file = true; break;
1182 case 'l': inc_local = true; break;
1183 case 'g': inc_global = true; break;
1184 case 'w': inc_weak = true; break;
1185 case 'd': inc_def = true; break;
1186 case 'u': inc_undef = true; break;
1187 case 'a': inc_abs = true; break;
1188 case 'c': inc_common = true; break;
1189 default: err("invalid symbol selector '%c'", *this_sym);
1190 }
1191 }
1192
1193 /* If no types are matched, not match all */
1194 if (!inc_notype && !inc_object && !inc_func && !inc_file)
1195 inc_notype = inc_object = inc_func = inc_file = true;
1196 if (!inc_local && !inc_global && !inc_weak)
1197 inc_local = inc_global = inc_weak = true;
1198 if (!inc_def && !inc_undef && !inc_abs && !inc_common)
1199 inc_def = inc_undef = inc_abs = inc_common = true;
1200
1201 /* backwards compat for defined/undefined short hand */
1202 } else if (*this_sym == '+') {
1203 inc_undef = false;
1204 ++this_sym;
1205 } else if (*this_sym == '-') {
1206 inc_def = inc_abs = inc_common = false;
1207 ++this_sym;
1208 }
1209
1210 /* filter symbols */
1211 if ((!inc_notype && stt == STT_NOTYPE) || \
1212 (!inc_object && stt == STT_OBJECT) || \
1213 (!inc_func && stt == STT_FUNC ) || \
1214 (!inc_file && stt == STT_FILE ) || \
1215 (!inc_local && stb == STB_LOCAL ) || \
1216 (!inc_global && stb == STB_GLOBAL) || \
1217 (!inc_weak && stb == STB_WEAK ) || \
1218 (!inc_def && shn && shn < SHN_LORESERVE) || \
1219 (!inc_undef && shn == SHN_UNDEF ) || \
1220 (!inc_abs && shn == SHN_ABS ) || \
1221 (!inc_common && shn == SHN_COMMON))
1222 continue;
1223
1224 if (*this_sym == '*') {
1225 /* a "*" symbol gets you debug output */
1226 printf("%s(%s) %5lX %15s %15s %15s %s\n",
1227 ((*found_sym == 0) ? "\n\t" : "\t"),
1228 elf->base_filename,
1229 size,
1230 get_elfstttype(stt),
1231 get_elfstbtype(stb),
1232 get_elfshntype(shn),
1233 symname);
1234 goto matched;
1235
1236 } else {
1237 if (g_match) {
1238 /* regex match the symbol */
1239 if (regexec(find_sym_regex_arr->eles[n], symname, 0, NULL, 0) == REG_NOMATCH)
1240 continue;
1241
1242 } else if (*this_sym) {
1243 /* give empty symbols a "pass", else do a normal compare */
1244 const size_t len = strlen(this_sym);
1245 if (!(strncmp(this_sym, symname, len) == 0 &&
1246 /* Accept unversioned symbol names */
1247 (symname[len] == '\0' || symname[len] == '@')))
1248 continue;
1249 }
1250
1251 if (be_semi_verbose) {
1252 char buf[1024];
1253 snprintf(buf, sizeof(buf), "%lX %s %s",
1254 size,
1255 get_elfstttype(stt),
1256 this_sym);
1257 *ret = xstrdup(buf);
1258 } else {
1259 if (*ret) xchrcat(ret, ',', ret_len);
1260 xstrcat(ret, symname, ret_len);
1261 }
1262
1263 goto matched;
1264 }
1265 }
1266
1267 return;
1268
1269 matched:
1270 *found_sym = 1;
1271}
1272
804static char *scanelf_file_sym(elfobj *elf, char *found_sym) 1273static const char *scanelf_file_sym(elfobj *elf, char *found_sym)
805{ 1274{
806 unsigned long i;
807 char *ret; 1275 char *ret;
808 void *symtab_void, *strtab_void; 1276 void *symtab_void, *strtab_void;
809 1277
810 if (!find_sym) return NULL; 1278 if (!find_sym) return NULL;
811 ret = find_sym; 1279 ret = NULL;
812 1280
813 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void); 1281 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
814 1282
815 if (symtab_void && strtab_void) { 1283 if (symtab_void && strtab_void) {
816#define FIND_SYM(B) \ 1284#define FIND_SYM(B) \
817 if (elf->elf_class == ELFCLASS ## B) { \ 1285 if (elf->elf_class == ELFCLASS ## B) { \
818 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 1286 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
819 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 1287 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
820 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 1288 Elf ## B ## _Sym *sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
821 unsigned long cnt = EGET(symtab->sh_entsize); \ 1289 Elf ## B ## _Word i, cnt = EGET(symtab->sh_entsize); \
822 char *symname; \ 1290 char *symname; \
1291 size_t ret_len = 0; \
823 if (cnt) \ 1292 if (cnt) \
824 cnt = EGET(symtab->sh_size) / cnt; \ 1293 cnt = EGET(symtab->sh_size) / cnt; \
825 for (i = 0; i < cnt; ++i) { \ 1294 for (i = 0; i < cnt; ++i) { \
1295 if ((void*)sym > elf->data_end) { \
1296 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1297 goto break_out; \
1298 } \
826 if (sym->st_name) { \ 1299 if (sym->st_name) { \
1300 /* make sure the symbol name is in acceptable memory range */ \
827 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 1301 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
828 if ((void*)symname > (void*)elf->data_end) { \ 1302 if ((void*)symname > elf->data_end) { \
829 warnf("%s: corrupt ELF symbols", elf->filename); \ 1303 warnf("%s: corrupt ELF symbols", elf->filename); \
1304 ++sym; \
830 continue; \ 1305 continue; \
831 } \ 1306 } \
832 if (*find_sym == '*') { \ 1307 scanelf_match_symname(elf, found_sym, \
833 printf("%s(%s) %5lX %15s %s\n", \ 1308 &ret, &ret_len, symname, \
834 ((*found_sym == 0) ? "\n\t" : "\t"), \ 1309 ELF##B##_ST_TYPE(EGET(sym->st_info)), \
835 elf->base_filename, \ 1310 ELF##B##_ST_BIND(EGET(sym->st_info)), \
836 (unsigned long)sym->st_size, \ 1311 EGET(sym->st_shndx), \
837 get_elfstttype(sym->st_info), \ 1312 /* st_size can be 64bit, but no one is really that big, so screw em */ \
838 symname); \ 1313 EGET(sym->st_size)); \
839 *found_sym = 1; \
840 } else { \
841 char *this_sym, *next_sym; \
842 this_sym = find_sym; \
843 do { \
844 next_sym = strchr(this_sym, ','); \
845 if (next_sym == NULL) \
846 next_sym = this_sym + strlen(this_sym); \
847 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
848 (strcmp(symname, versioned_symname) == 0)) { \
849 ret = this_sym; \
850 (*found_sym)++; \
851 goto break_out; \
852 } \
853 this_sym = next_sym + 1; \
854 } while (*next_sym != '\0'); \
855 } \
856 } \ 1314 } \
857 ++sym; \ 1315 ++sym; \
858 } } 1316 } \
1317 }
859 FIND_SYM(32) 1318 FIND_SYM(32)
860 FIND_SYM(64) 1319 FIND_SYM(64)
861 } 1320 }
862 1321
863break_out: 1322break_out:
866 if (*find_sym != '*' && *found_sym) 1325 if (*find_sym != '*' && *found_sym)
867 return ret; 1326 return ret;
868 if (be_quiet) 1327 if (be_quiet)
869 return NULL; 1328 return NULL;
870 else 1329 else
871 return (char *)" - "; 1330 return " - ";
872} 1331}
873 1332
1333static const char *scanelf_file_sections(elfobj *elf, char *found_section)
1334{
1335 if (!find_section)
1336 return NULL;
1337
1338#define FIND_SECTION(B) \
1339 if (elf->elf_class == ELFCLASS ## B) { \
1340 size_t matched, n; \
1341 int invert; \
1342 const char *section_name; \
1343 Elf ## B ## _Shdr *section; \
1344 \
1345 matched = 0; \
1346 array_for_each(find_section_arr, n, section_name) { \
1347 invert = (*section_name == '!' ? 1 : 0); \
1348 section = SHDR ## B (elf_findsecbyname(elf, section_name + invert)); \
1349 if ((section == NULL && invert) || (section != NULL && !invert)) \
1350 ++matched; \
1351 } \
1352 \
1353 if (matched == array_cnt(find_section_arr)) \
1354 *found_section = 1; \
1355 }
1356 FIND_SECTION(32)
1357 FIND_SECTION(64)
1358
1359 if (be_wewy_wewy_quiet)
1360 return NULL;
1361
1362 if (*found_section)
1363 return find_section;
1364
1365 if (be_quiet)
1366 return NULL;
1367 else
1368 return " - ";
1369}
874 1370
875/* scan an elf file and show all the fun stuff */ 1371/* scan an elf file and show all the fun stuff */
876#define prints(str) write(fileno(stdout), str, strlen(str)) 1372#define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
877static int scanelf_elfobj(elfobj *elf) 1373static int scanelf_elfobj(elfobj *elf)
878{ 1374{
879 unsigned long i; 1375 unsigned long i;
880 char found_pax, found_phdr, found_relro, found_load, found_textrel, 1376 char found_pax, found_phdr, found_relro, found_load, found_textrel,
881 found_rpath, found_needed, found_interp, found_bind, found_soname, 1377 found_rpath, found_needed, found_interp, found_bind, found_soname,
882 found_sym, found_lib, found_file, found_textrels; 1378 found_sym, found_lib, found_file, found_textrels, found_section;
883 static char *out_buffer = NULL; 1379 static char *out_buffer = NULL;
884 static size_t out_len; 1380 static size_t out_len;
885 1381
886 found_pax = found_phdr = found_relro = found_load = found_textrel = \ 1382 found_pax = found_phdr = found_relro = found_load = found_textrel = \
887 found_rpath = found_needed = found_interp = found_bind = found_soname = \ 1383 found_rpath = found_needed = found_interp = found_bind = found_soname = \
888 found_sym = found_lib = found_file = found_textrels = 0; 1384 found_sym = found_lib = found_file = found_textrels = found_section = 0;
889 1385
890 if (be_verbose > 2) 1386 if (be_verbose > 2)
891 printf("%s: scanning file {%s,%s}\n", elf->filename, 1387 printf("%s: scanning file {%s,%s}\n", elf->filename,
892 get_elfeitype(EI_CLASS, elf->elf_class), 1388 get_elfeitype(EI_CLASS, elf->elf_class),
893 get_elfeitype(EI_DATA, elf->data[EI_DATA])); 1389 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
895 printf("%s: scanning file\n", elf->filename); 1391 printf("%s: scanning file\n", elf->filename);
896 1392
897 /* init output buffer */ 1393 /* init output buffer */
898 if (!out_buffer) { 1394 if (!out_buffer) {
899 out_len = sizeof(char) * 80; 1395 out_len = sizeof(char) * 80;
900 out_buffer = (char*)xmalloc(out_len); 1396 out_buffer = xmalloc(out_len);
901 } 1397 }
902 *out_buffer = '\0'; 1398 *out_buffer = '\0';
903 1399
904 /* show the header */ 1400 /* show the header */
905 if (!be_quiet && show_banner) { 1401 if (!be_quiet && show_banner) {
906 for (i = 0; out_format[i]; ++i) { 1402 for (i = 0; out_format[i]; ++i) {
907 if (!IS_MODIFIER(out_format[i])) continue; 1403 if (!IS_MODIFIER(out_format[i])) continue;
908 1404
909 switch (out_format[++i]) { 1405 switch (out_format[++i]) {
1406 case '+': break;
910 case '%': break; 1407 case '%': break;
911 case '#': break; 1408 case '#': break;
912 case 'F': 1409 case 'F':
913 case 'p': 1410 case 'p':
914 case 'f': prints("FILE "); found_file = 1; break; 1411 case 'f': prints("FILE "); found_file = 1; break;
915 case 'o': prints(" TYPE "); break; 1412 case 'o': prints(" TYPE "); break;
916 case 'x': prints(" PAX "); break; 1413 case 'x': prints(" PAX "); break;
917 case 'e': prints("STK/REL/PTL "); break; 1414 case 'e': prints("STK/REL/PTL "); break;
918 case 't': prints("TEXTREL "); break; 1415 case 't': prints("TEXTREL "); break;
919 case 'r': prints("RPATH "); break; 1416 case 'r': prints("RPATH "); break;
1417 case 'M': prints("CLASS "); break;
1418 case 'l':
920 case 'n': prints("NEEDED "); break; 1419 case 'n': prints("NEEDED "); break;
921 case 'i': prints("INTERP "); break; 1420 case 'i': prints("INTERP "); break;
922 case 'b': prints("BIND "); break; 1421 case 'b': prints("BIND "); break;
1422 case 'Z': prints("SIZE "); break;
923 case 'S': prints("SONAME "); break; 1423 case 'S': prints("SONAME "); break;
924 case 's': prints("SYM "); break; 1424 case 's': prints("SYM "); break;
925 case 'N': prints("LIB "); break; 1425 case 'N': prints("LIB "); break;
926 case 'T': prints("TEXTRELS "); break; 1426 case 'T': prints("TEXTRELS "); break;
1427 case 'k': prints("SECTION "); break;
1428 case 'a': prints("ARCH "); break;
1429 case 'I': prints("OSABI "); break;
1430 case 'Y': prints("EABI "); break;
1431 case 'O': prints("PERM "); break;
1432 case 'D': prints("ENDIAN "); break;
927 default: warnf("'%c' has no title ?", out_format[i]); 1433 default: warnf("'%c' has no title ?", out_format[i]);
928 } 1434 }
929 } 1435 }
930 if (!found_file) prints("FILE "); 1436 if (!found_file) prints("FILE ");
931 prints("\n"); 1437 prints("\n");
935 1441
936 /* dump all the good stuff */ 1442 /* dump all the good stuff */
937 for (i = 0; out_format[i]; ++i) { 1443 for (i = 0; out_format[i]; ++i) {
938 const char *out; 1444 const char *out;
939 const char *tmp; 1445 const char *tmp;
940 1446 static char ubuf[sizeof(unsigned long)*2];
941 /* make sure we trim leading spaces in quiet mode */
942 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
943 *out_buffer = '\0';
944
945 if (!IS_MODIFIER(out_format[i])) { 1447 if (!IS_MODIFIER(out_format[i])) {
946 xchrcat(&out_buffer, out_format[i], &out_len); 1448 xchrcat(&out_buffer, out_format[i], &out_len);
947 continue; 1449 continue;
948 } 1450 }
949 1451
950 out = NULL; 1452 out = NULL;
951 be_wewy_wewy_quiet = (out_format[i] == '#'); 1453 be_wewy_wewy_quiet = (out_format[i] == '#');
1454 be_semi_verbose = (out_format[i] == '+');
952 switch (out_format[++i]) { 1455 switch (out_format[++i]) {
1456 case '+':
953 case '%': 1457 case '%':
954 case '#': 1458 case '#':
955 xchrcat(&out_buffer, out_format[i], &out_len); break; 1459 xchrcat(&out_buffer, out_format[i], &out_len); break;
956 case 'F': 1460 case 'F':
957 found_file = 1; 1461 found_file = 1;
983 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1487 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
984 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break; 1488 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
985 case 't': out = scanelf_file_textrel(elf, &found_textrel); break; 1489 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
986 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break; 1490 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
987 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break; 1491 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1492 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1493 case 'D': out = get_endian(elf); break;
1494 case 'O': out = strfileperms(elf->filename); break;
988 case 'n': 1495 case 'n':
989 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break; 1496 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
990 case 'i': out = scanelf_file_interp(elf, &found_interp); break; 1497 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
991 case 'b': out = scanelf_file_bind(elf, &found_bind); break; 1498 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
992 case 'S': out = scanelf_file_soname(elf, &found_soname); break; 1499 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
993 case 's': out = scanelf_file_sym(elf, &found_sym); break; 1500 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1501 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1502 case 'a': out = get_elfemtype(elf); break;
1503 case 'I': out = get_elfosabi(elf); break;
1504 case 'Y': out = get_elf_eabi(elf); break;
1505 case 'Z': snprintf(ubuf, sizeof(ubuf), "%lu", (unsigned long)elf->len); out = ubuf; break;;
994 default: warnf("'%c' has no scan code?", out_format[i]); 1506 default: warnf("'%c' has no scan code?", out_format[i]);
995 } 1507 }
996 if (out) { 1508 if (out)
997 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
998 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
999 xstrncat(&out_buffer, out, &out_len, (tmp-out));
1000 else
1001 xstrcat(&out_buffer, out, &out_len); 1509 xstrcat(&out_buffer, out, &out_len);
1002 }
1003 } 1510 }
1004 1511
1005#define FOUND_SOMETHING() \ 1512#define FOUND_SOMETHING() \
1006 (found_pax || found_phdr || found_relro || found_load || found_textrel || \ 1513 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1007 found_rpath || found_needed || found_interp || found_bind || \ 1514 found_rpath || found_needed || found_interp || found_bind || \
1008 found_soname || found_sym || found_lib || found_textrels) 1515 found_soname || found_sym || found_lib || found_textrels || found_section )
1009 1516
1010 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) { 1517 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1011 xchrcat(&out_buffer, ' ', &out_len); 1518 xchrcat(&out_buffer, ' ', &out_len);
1012 xstrcat(&out_buffer, elf->filename, &out_len); 1519 xstrcat(&out_buffer, elf->filename, &out_len);
1013 } 1520 }
1020} 1527}
1021 1528
1022/* scan a single elf */ 1529/* scan a single elf */
1023static int scanelf_elf(const char *filename, int fd, size_t len) 1530static int scanelf_elf(const char *filename, int fd, size_t len)
1024{ 1531{
1025 int ret; 1532 int ret = 1;
1026 elfobj *elf; 1533 elfobj *elf;
1027 1534
1028 /* verify this is real ELF */ 1535 /* verify this is real ELF */
1029 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) { 1536 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1030 if (be_verbose > 2) printf("%s: not an ELF\n", filename); 1537 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1031 return 1; 1538 return 2;
1032 } 1539 }
1033 1540 switch (match_bits) {
1541 case 32:
1542 if (elf->elf_class != ELFCLASS32)
1543 goto label_done;
1544 break;
1545 case 64:
1546 if (elf->elf_class != ELFCLASS64)
1547 goto label_done;
1548 break;
1549 default: break;
1550 }
1034 if (strlen(match_etypes)) { 1551 if (match_etypes) {
1035 char sbuf[126]; 1552 char sbuf[126];
1036 strncpy(sbuf, match_etypes, sizeof(sbuf)); 1553 strncpy(sbuf, match_etypes, sizeof(sbuf));
1037 if (strchr(match_etypes, ',') != NULL) { 1554 if (strchr(match_etypes, ',') != NULL) {
1038 char *p; 1555 char *p;
1039 while((p = strrchr(sbuf, ',')) != NULL) { 1556 while ((p = strrchr(sbuf, ',')) != NULL) {
1040 *p = 0; 1557 *p = 0;
1041 if (atoi(p+1) == get_etype(elf)) 1558 if (etype_lookup(p+1) == get_etype(elf))
1042 goto label_ret; 1559 goto label_ret;
1043 } 1560 }
1044 } 1561 }
1045 if (atoi(sbuf) != get_etype(elf)) { 1562 if (etype_lookup(sbuf) != get_etype(elf))
1046 ret = 1;
1047 goto label_done; 1563 goto label_done;
1048 }
1049 } 1564 }
1050 1565
1051label_ret: 1566label_ret:
1052 ret = scanelf_elfobj(elf); 1567 ret = scanelf_elfobj(elf);
1053 1568
1066 1581
1067 ar = ar_open_fd(filename, fd); 1582 ar = ar_open_fd(filename, fd);
1068 if (ar == NULL) 1583 if (ar == NULL)
1069 return 1; 1584 return 1;
1070 1585
1071 ar_buffer = (char*)mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0); 1586 ar_buffer = mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1072 while ((m=ar_next(ar)) != NULL) { 1587 while ((m = ar_next(ar)) != NULL) {
1588 off_t cur_pos = lseek(fd, 0, SEEK_CUR);
1589 if (cur_pos == -1)
1590 errp("lseek() failed");
1073 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size); 1591 elf = readelf_buffer(m->name, ar_buffer + cur_pos, m->size);
1074 if (elf) { 1592 if (elf) {
1075 scanelf_elfobj(elf); 1593 scanelf_elfobj(elf);
1076 unreadelf(elf); 1594 unreadelf(elf);
1077 } 1595 }
1078 } 1596 }
1079 munmap(ar_buffer, len); 1597 munmap(ar_buffer, len);
1080 1598
1081 return 0; 1599 return 0;
1082} 1600}
1083/* scan a file which may be an elf or an archive or some other magical beast */ 1601/* scan a file which may be an elf or an archive or some other magical beast */
1084static void scanelf_file(const char *filename) 1602static int scanelf_fileat(int dir_fd, const char *filename, const struct stat *st_cache)
1085{ 1603{
1604 const struct stat *st = st_cache;
1086 struct stat st; 1605 struct stat symlink_st;
1087 int fd; 1606 int fd;
1088 1607
1089 /* make sure 'filename' exists */
1090 if (lstat(filename, &st) == -1) {
1091 if (be_verbose > 2) printf("%s: does not exist\n", filename);
1092 return;
1093 }
1094
1095 /* always handle regular files and handle symlinked files if no -y */ 1608 /* always handle regular files and handle symlinked files if no -y */
1096 if (S_ISLNK(st.st_mode)) { 1609 if (S_ISLNK(st->st_mode)) {
1097 if (!scan_symlink) return; 1610 if (!scan_symlink)
1098 stat(filename, &st); 1611 return 1;
1612 fstatat(dir_fd, filename, &symlink_st, 0);
1613 st = &symlink_st;
1099 } 1614 }
1615
1100 if (!S_ISREG(st.st_mode)) { 1616 if (!S_ISREG(st->st_mode)) {
1101 if (be_verbose > 2) printf("%s: skipping non-file\n", filename); 1617 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1102 return; 1618 return 1;
1103 } 1619 }
1104 1620
1105 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1) 1621 if (match_perms) {
1622 if ((st->st_mode | match_perms) != st->st_mode)
1623 return 1;
1624 }
1625 fd = openat(dir_fd, filename, (fix_elf ? O_RDWR : O_RDONLY) | O_CLOEXEC);
1626 if (fd == -1) {
1627 if (fix_elf && errno == ETXTBSY)
1628 warnp("%s: could not fix", filename);
1629 else if (be_verbose > 2)
1630 printf("%s: skipping file: %s\n", filename, strerror(errno));
1106 return; 1631 return 1;
1632 }
1107 1633
1108 if (scanelf_elf(filename, fd, st.st_size) == 1 && scan_archives) 1634 if (scanelf_elf(filename, fd, st->st_size) == 2) {
1109 /* if it isn't an ELF, maybe it's an .a archive */ 1635 /* if it isn't an ELF, maybe it's an .a archive */
1636 if (scan_archives)
1110 scanelf_archive(filename, fd, st.st_size); 1637 scanelf_archive(filename, fd, st->st_size);
1111 1638
1639 /*
1640 * unreadelf() implicitly closes its fd, so only close it
1641 * when we are returning it in the non-ELF case
1642 */
1112 close(fd); 1643 close(fd);
1644 }
1645
1646 return 0;
1113} 1647}
1114 1648
1115/* 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 */
1116static void scanelf_dir(const char *path) 1650static int scanelf_dirat(int dir_fd, const char *path)
1117{ 1651{
1118 register DIR *dir; 1652 register DIR *dir;
1119 register struct dirent *dentry; 1653 register struct dirent *dentry;
1120 struct stat st_top, st; 1654 struct stat st_top, st;
1121 char buf[__PAX_UTILS_PATH_MAX]; 1655 char buf[__PAX_UTILS_PATH_MAX], *subpath;
1122 size_t pathlen = 0, len = 0; 1656 size_t pathlen = 0, len = 0;
1657 int ret = 0;
1658 int subdir_fd;
1123 1659
1124 /* make sure path exists */ 1660 /* make sure path exists */
1125 if (lstat(path, &st_top) == -1) { 1661 if (fstatat(dir_fd, path, &st_top, AT_SYMLINK_NOFOLLOW) == -1) {
1126 if (be_verbose > 2) printf("%s: does not exist\n", path); 1662 if (be_verbose > 2) printf("%s: does not exist\n", path);
1127 return; 1663 return 1;
1128 } 1664 }
1129 1665
1130 /* 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 */
1131 if (!S_ISDIR(st_top.st_mode)) { 1667 if (!S_ISDIR(st_top.st_mode))
1132 scanelf_file(path); 1668 return scanelf_fileat(dir_fd, path, &st_top);
1133 return;
1134 }
1135 1669
1136 /* now scan the dir looking for fun stuff */ 1670 /* now scan the dir looking for fun stuff */
1137 if ((dir = opendir(path)) == NULL) { 1671 subdir_fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
1138 warnf("could not opendir %s: %s", path, strerror(errno)); 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);
1679 warnfp("could not opendir(%s)", path);
1139 return; 1680 return 1;
1140 } 1681 }
1141 if (be_verbose > 1) printf("%s: scanning dir\n", path); 1682 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1142 1683
1143 pathlen = strlen(path); 1684 subpath = stpcpy(buf, path);
1685 if (subpath[-1] != '/')
1686 *subpath++ = '/';
1687 pathlen = subpath - buf;
1144 while ((dentry = readdir(dir))) { 1688 while ((dentry = readdir(dir))) {
1145 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1689 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1146 continue; 1690 continue;
1691
1692 if (fstatat(subdir_fd, dentry->d_name, &st, AT_SYMLINK_NOFOLLOW) == -1)
1693 continue;
1694
1147 len = (pathlen + 1 + strlen(dentry->d_name) + 1); 1695 len = strlen(dentry->d_name);
1148 if (len >= sizeof(buf)) { 1696 if (len + pathlen + 1 >= sizeof(buf)) {
1149 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path, 1697 warnf("Skipping '%s%s': len > sizeof(buf); %zu > %zu\n",
1150 (unsigned long)len, (unsigned long)sizeof(buf)); 1698 path, dentry->d_name, len + pathlen + 1, sizeof(buf));
1151 continue; 1699 continue;
1152 } 1700 }
1153 sprintf(buf, "%s/%s", path, dentry->d_name); 1701 memcpy(subpath, dentry->d_name, len);
1154 if (lstat(buf, &st) != -1) { 1702 subpath[len] = '\0';
1703
1155 if (S_ISREG(st.st_mode)) 1704 if (S_ISREG(st.st_mode))
1156 scanelf_file(buf); 1705 ret = scanelf_fileat(dir_fd, buf, &st);
1157 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1706 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1158 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1707 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1159 scanelf_dir(buf); 1708 ret = scanelf_dirat(dir_fd, buf);
1160 }
1161 } 1709 }
1162 } 1710 }
1163 closedir(dir); 1711 closedir(dir);
1164}
1165 1712
1713 return ret;
1714}
1715static int scanelf_dir(const char *path)
1716{
1717 return scanelf_dirat(root_fd, root_rel_path(path));
1718}
1719
1166static int scanelf_from_file(char *filename) 1720static int scanelf_from_file(const char *filename)
1167{ 1721{
1168 FILE *fp = NULL; 1722 FILE *fp;
1169 char *p; 1723 char *p, *path;
1170 char path[__PAX_UTILS_PATH_MAX]; 1724 size_t len;
1725 int ret;
1171 1726
1172 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL)) 1727 if (strcmp(filename, "-") == 0)
1173 fp = stdin; 1728 fp = stdin;
1174 else if ((fp = fopen(filename, "r")) == NULL) 1729 else if ((fp = fopen(filename, "r")) == NULL)
1175 return 1; 1730 return 1;
1176 1731
1177 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) { 1732 path = NULL;
1733 len = 0;
1734 ret = 0;
1735 while (getline(&path, &len, fp) != -1) {
1178 if ((p = strchr(path, '\n')) != NULL) 1736 if ((p = strchr(path, '\n')) != NULL)
1179 *p = 0; 1737 *p = 0;
1180 search_path = path; 1738 search_path = path;
1181 scanelf_dir(path); 1739 ret = scanelf_dir(path);
1182 } 1740 }
1741 free(path);
1742
1183 if (fp != stdin) 1743 if (fp != stdin)
1184 fclose(fp); 1744 fclose(fp);
1745
1185 return 0; 1746 return ret;
1186} 1747}
1187 1748
1188static void load_ld_so_conf() 1749#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1750
1751static int _load_ld_cache_config(const char *fname)
1189{ 1752{
1190 FILE *fp = NULL; 1753 FILE *fp = NULL;
1191 char *p; 1754 char *p, *path;
1192 char path[__PAX_UTILS_PATH_MAX]; 1755 size_t len;
1193 int i = 0; 1756 int curr_fd = -1;
1194 1757
1195 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1758 fp = fopenat_r(root_fd, root_rel_path(fname));
1759 if (fp == NULL)
1196 return; 1760 return -1;
1197 1761
1198 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) { 1762 path = NULL;
1199 if (*path != '/') 1763 len = 0;
1200 continue; 1764 while (getline(&path, &len, fp) != -1) {
1201
1202 if ((p = strrchr(path, '\r')) != NULL) 1765 if ((p = strrchr(path, '\r')) != NULL)
1203 *p = 0; 1766 *p = 0;
1204 if ((p = strchr(path, '\n')) != NULL) 1767 if ((p = strchr(path, '\n')) != NULL)
1205 *p = 0; 1768 *p = 0;
1206 1769
1207 ldpaths[i++] = xstrdup(path); 1770 /* recursive includes of the same file will make this segfault. */
1771 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1772 glob_t gl;
1773 size_t x;
1774 const char *gpath;
1208 1775
1209 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths)) 1776 /* re-use existing path buffer ... need to be creative */
1210 break; 1777 if (path[8] != '/')
1778 gpath = memcpy(path + 3, "/etc/", 5);
1779 else
1780 gpath = path + 8;
1781 if (root_fd != AT_FDCWD) {
1782 if (curr_fd == -1) {
1783 curr_fd = open(".", O_RDONLY|O_CLOEXEC);
1784 if (fchdir(root_fd))
1785 errp("unable to change to root dir");
1786 }
1787 gpath = root_rel_path(gpath);
1788 }
1789
1790 if (glob(gpath, 0, NULL, &gl) == 0) {
1791 for (x = 0; x < gl.gl_pathc; ++x) {
1792 /* try to avoid direct loops */
1793 if (strcmp(gl.gl_pathv[x], fname) == 0)
1794 continue;
1795 _load_ld_cache_config(gl.gl_pathv[x]);
1796 }
1797 globfree(&gl);
1798 }
1799
1800 /* failed globs are ignored by glibc */
1801 continue;
1211 } 1802 }
1212 ldpaths[i] = NULL; 1803
1804 if (*path != '/')
1805 continue;
1806
1807 xarraypush_str(ldpaths, path);
1808 }
1809 free(path);
1213 1810
1214 fclose(fp); 1811 fclose(fp);
1812
1813 if (curr_fd != -1) {
1814 if (fchdir(curr_fd))
1815 /* don't care */;
1816 close(curr_fd);
1817 }
1818
1819 return 0;
1820}
1821
1822#elif defined(__FreeBSD__) || defined(__DragonFly__)
1823
1824static int _load_ld_cache_config(const char *fname)
1825{
1826 FILE *fp = NULL;
1827 char *b = NULL, *p;
1828 struct elfhints_hdr hdr;
1829
1830 fp = fopenat_r(root_fd, root_rel_path(fname));
1831 if (fp == NULL)
1832 return -1;
1833
1834 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1835 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1836 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1837 {
1838 fclose(fp);
1839 return -1;
1840 }
1841
1842 b = xmalloc(hdr.dirlistlen + 1);
1843 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1844 fclose(fp);
1845 free(b);
1846 return -1;
1847 }
1848
1849 while ((p = strsep(&b, ":"))) {
1850 if (*p == '\0')
1851 continue;
1852 xarraypush_str(ldpaths, p);
1853 }
1854
1855 free(b);
1856 fclose(fp);
1857 return 0;
1858}
1859
1860#else
1861#ifdef __ELF__
1862#warning Cache config support not implemented for your target
1863#endif
1864static int _load_ld_cache_config(const char *fname)
1865{
1866 return 0;
1867}
1868#endif
1869
1870static void load_ld_cache_config(const char *fname)
1871{
1872 bool scan_l, scan_ul, scan_ull;
1873 size_t n;
1874 const char *ldpath;
1875
1876 _load_ld_cache_config(fname);
1877
1878 scan_l = scan_ul = scan_ull = false;
1879 if (array_cnt(ldpaths)) {
1880 array_for_each(ldpaths, n, ldpath) {
1881 if (!scan_l && !strcmp(ldpath, "/lib")) scan_l = true;
1882 if (!scan_ul && !strcmp(ldpath, "/usr/lib")) scan_ul = true;
1883 if (!scan_ull && !strcmp(ldpath, "/usr/local/lib")) scan_ull = true;
1884 }
1885 }
1886
1887 if (!scan_l) xarraypush_str(ldpaths, "/lib");
1888 if (!scan_ul) xarraypush_str(ldpaths, "/usr/lib");
1889 if (!scan_ull) xarraypush_str(ldpaths, "/usr/local/lib");
1215} 1890}
1216 1891
1217/* scan /etc/ld.so.conf for paths */ 1892/* scan /etc/ld.so.conf for paths */
1218static void scanelf_ldpath() 1893static void scanelf_ldpath(void)
1219{ 1894{
1220 char scan_l, scan_ul, scan_ull; 1895 size_t n;
1221 int i = 0; 1896 const char *ldpath;
1222 1897
1223 if (!ldpaths[0]) 1898 array_for_each(ldpaths, n, ldpath)
1224 err("Unable to load any paths from ld.so.conf");
1225
1226 scan_l = scan_ul = scan_ull = 0;
1227
1228 while (ldpaths[i]) {
1229 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
1230 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
1231 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
1232 scanelf_dir(ldpaths[i]); 1899 scanelf_dir(ldpath);
1233 ++i;
1234 }
1235
1236 if (!scan_l) scanelf_dir("/lib");
1237 if (!scan_ul) scanelf_dir("/usr/lib");
1238 if (!scan_ull) scanelf_dir("/usr/local/lib");
1239} 1900}
1240 1901
1241/* scan env PATH for paths */ 1902/* scan env PATH for paths */
1242static void scanelf_envpath() 1903static void scanelf_envpath(void)
1243{ 1904{
1244 char *path, *p; 1905 char *path, *p;
1245 1906
1246 path = getenv("PATH"); 1907 path = getenv("PATH");
1247 if (!path) 1908 if (!path)
1254 } 1915 }
1255 1916
1256 free(path); 1917 free(path);
1257} 1918}
1258 1919
1259 1920/* usage / invocation handling functions */ /* Free Flags: c d j u w G H J K P Q U W */
1260/* usage / invocation handling functions */
1261#define PARSE_FLAGS "plRmyAXxetrnLibSs:gN:TaqvF:f:o:E:BhV" 1921#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZCBhV"
1262#define a_argument required_argument 1922#define a_argument required_argument
1263static struct option const long_opts[] = { 1923static struct option const long_opts[] = {
1264 {"path", no_argument, NULL, 'p'}, 1924 {"path", no_argument, NULL, 'p'},
1265 {"ldpath", no_argument, NULL, 'l'}, 1925 {"ldpath", no_argument, NULL, 'l'},
1926 {"use-ldpath",no_argument, NULL, 129},
1927 {"root", a_argument, NULL, 128},
1266 {"recursive", no_argument, NULL, 'R'}, 1928 {"recursive", no_argument, NULL, 'R'},
1267 {"mount", no_argument, NULL, 'm'}, 1929 {"mount", no_argument, NULL, 'm'},
1268 {"symlink", no_argument, NULL, 'y'}, 1930 {"symlink", no_argument, NULL, 'y'},
1269 {"archives", no_argument, NULL, 'A'}, 1931 {"archives", no_argument, NULL, 'A'},
1270 {"ldcache", no_argument, NULL, 'L'}, 1932 {"ldcache", no_argument, NULL, 'L'},
1271 {"fix", no_argument, NULL, 'X'}, 1933 {"fix", no_argument, NULL, 'X'},
1934 {"setpax", a_argument, NULL, 'z'},
1272 {"pax", no_argument, NULL, 'x'}, 1935 {"pax", no_argument, NULL, 'x'},
1273 {"header", no_argument, NULL, 'e'}, 1936 {"header", no_argument, NULL, 'e'},
1274 {"textrel", no_argument, NULL, 't'}, 1937 {"textrel", no_argument, NULL, 't'},
1275 {"rpath", no_argument, NULL, 'r'}, 1938 {"rpath", no_argument, NULL, 'r'},
1276 {"needed", no_argument, NULL, 'n'}, 1939 {"needed", no_argument, NULL, 'n'},
1277 {"interp", no_argument, NULL, 'i'}, 1940 {"interp", no_argument, NULL, 'i'},
1278 {"bind", no_argument, NULL, 'b'}, 1941 {"bind", no_argument, NULL, 'b'},
1279 {"soname", no_argument, NULL, 'S'}, 1942 {"soname", no_argument, NULL, 'S'},
1280 {"symbol", a_argument, NULL, 's'}, 1943 {"symbol", a_argument, NULL, 's'},
1944 {"section", a_argument, NULL, 'k'},
1281 {"lib", a_argument, NULL, 'N'}, 1945 {"lib", a_argument, NULL, 'N'},
1282 {"gmatch", no_argument, NULL, 'g'}, 1946 {"gmatch", no_argument, NULL, 'g'},
1283 {"textrels", no_argument, NULL, 'T'}, 1947 {"textrels", no_argument, NULL, 'T'},
1284 {"etype", a_argument, NULL, 'E'}, 1948 {"etype", a_argument, NULL, 'E'},
1949 {"bits", a_argument, NULL, 'M'},
1950 {"endian", no_argument, NULL, 'D'},
1951 {"osabi", no_argument, NULL, 'I'},
1952 {"eabi", no_argument, NULL, 'Y'},
1953 {"perms", a_argument, NULL, 'O'},
1954 {"size", no_argument, NULL, 'Z'},
1285 {"all", no_argument, NULL, 'a'}, 1955 {"all", no_argument, NULL, 'a'},
1286 {"quiet", no_argument, NULL, 'q'}, 1956 {"quiet", no_argument, NULL, 'q'},
1287 {"verbose", no_argument, NULL, 'v'}, 1957 {"verbose", no_argument, NULL, 'v'},
1288 {"format", a_argument, NULL, 'F'}, 1958 {"format", a_argument, NULL, 'F'},
1289 {"from", a_argument, NULL, 'f'}, 1959 {"from", a_argument, NULL, 'f'},
1290 {"file", a_argument, NULL, 'o'}, 1960 {"file", a_argument, NULL, 'o'},
1961 {"nocolor", no_argument, NULL, 'C'},
1291 {"nobanner", no_argument, NULL, 'B'}, 1962 {"nobanner", no_argument, NULL, 'B'},
1292 {"help", no_argument, NULL, 'h'}, 1963 {"help", no_argument, NULL, 'h'},
1293 {"version", no_argument, NULL, 'V'}, 1964 {"version", no_argument, NULL, 'V'},
1294 {NULL, no_argument, NULL, 0x0} 1965 {NULL, no_argument, NULL, 0x0}
1295}; 1966};
1296 1967
1297static const char *opts_help[] = { 1968static const char * const opts_help[] = {
1298 "Scan all directories in PATH environment", 1969 "Scan all directories in PATH environment",
1299 "Scan all directories in /etc/ld.so.conf", 1970 "Scan all directories in /etc/ld.so.conf",
1971 "Use ld.so.conf to show full path (use with -r/-n)",
1972 "Root directory (use with -l or -p)",
1300 "Scan directories recursively", 1973 "Scan directories recursively",
1301 "Don't recursively cross mount points", 1974 "Don't recursively cross mount points",
1302 "Don't scan symlinks", 1975 "Don't scan symlinks",
1303 "Scan archives (.a files)", 1976 "Scan archives (.a files)",
1304 "Utilize ld.so.cache information (use with -r/-n)", 1977 "Utilize ld.so.cache to show full path (use with -r/-n)",
1305 "Try and 'fix' bad things (use with -r/-e)\n", 1978 "Try and 'fix' bad things (use with -r/-e)",
1979 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1306 "Print PaX markings", 1980 "Print PaX markings",
1307 "Print GNU_STACK/PT_LOAD markings", 1981 "Print GNU_STACK/PT_LOAD markings",
1308 "Print TEXTREL information", 1982 "Print TEXTREL information",
1309 "Print RPATH information", 1983 "Print RPATH information",
1310 "Print NEEDED information", 1984 "Print NEEDED information",
1311 "Print INTERP information", 1985 "Print INTERP information",
1312 "Print BIND information", 1986 "Print BIND information",
1313 "Print SONAME information", 1987 "Print SONAME information",
1314 "Find a specified symbol", 1988 "Find a specified symbol",
1989 "Find a specified section",
1315 "Find a specified library", 1990 "Find a specified library",
1316 "Use strncmp to match libraries. (use with -N)", 1991 "Use regex rather than string compare (with -s); specify twice for case insensitive",
1317 "Locate cause of TEXTREL", 1992 "Locate cause of TEXTREL",
1993 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1318 "Print only ELF files matching numeric constant", 1994 "Print only ELF files matching numeric bits",
1319 "Print all scanned info (-x -e -t -r -b)\n", 1995 "Print Endianness",
1996 "Print OSABI",
1997 "Print EABI (EM_ARM Only)",
1998 "Print only ELF files matching octal permissions",
1999 "Print ELF file size",
2000 "Print all useful/simple info\n",
1320 "Only output 'bad' things", 2001 "Only output 'bad' things",
1321 "Be verbose (can be specified more than once)", 2002 "Be verbose (can be specified more than once)",
1322 "Use specified format for output", 2003 "Use specified format for output",
1323 "Read input stream from a filename", 2004 "Read input stream from a filename",
1324 "Write output stream to a filename", 2005 "Write output stream to a filename",
2006 "Don't emit color in output",
1325 "Don't display the header", 2007 "Don't display the header",
1326 "Print this help and exit", 2008 "Print this help and exit",
1327 "Print version and exit", 2009 "Print version and exit",
1328 NULL 2010 NULL
1329}; 2011};
1333{ 2015{
1334 unsigned long i; 2016 unsigned long i;
1335 printf("* Scan ELF binaries for stuff\n\n" 2017 printf("* Scan ELF binaries for stuff\n\n"
1336 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0); 2018 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1337 printf("Options: -[%s]\n", PARSE_FLAGS); 2019 printf("Options: -[%s]\n", PARSE_FLAGS);
1338 for (i = 0; long_opts[i].name; ++i) 2020 for (i = 0; long_opts[i].name; ++i) {
2021 /* first output the short flag if it has one */
2022 if (long_opts[i].val > '~')
2023 printf(" ");
2024 else
2025 printf(" -%c, ", long_opts[i].val);
2026
2027 /* then the long flag */
1339 if (long_opts[i].has_arg == no_argument) 2028 if (long_opts[i].has_arg == no_argument)
1340 printf(" -%c, --%-13s* %s\n", long_opts[i].val, 2029 printf("--%-14s", long_opts[i].name);
1341 long_opts[i].name, opts_help[i]);
1342 else 2030 else
1343 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val, 2031 printf("--%-7s <arg> ", long_opts[i].name);
1344 long_opts[i].name, opts_help[i]);
1345 2032
1346 if (status != EXIT_SUCCESS) 2033 /* finally the help text */
1347 exit(status); 2034 printf("* %s\n", opts_help[i]);
2035 }
1348 2036
1349 puts("\nThe format modifiers for the -F option are:"); 2037 puts("\nFor more information, see the scanelf(1) manpage");
1350 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1351 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1352 puts(" i INTERP \tb BIND \ts symbol");
1353 puts(" N library \to Type \tT TEXTRELs");
1354 puts(" S SONAME");
1355 puts(" p filename (with search path removed)");
1356 puts(" f filename (short name/basename)");
1357 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1358
1359 exit(status); 2038 exit(status);
1360} 2039}
1361 2040
1362/* parse command line arguments and preform needed actions */ 2041/* parse command line arguments and preform needed actions */
2042#define do_pax_state(option, flag) \
2043 if (islower(option)) { \
2044 flags &= ~PF_##flag; \
2045 flags |= PF_NO##flag; \
2046 } else { \
2047 flags &= ~PF_NO##flag; \
2048 flags |= PF_##flag; \
2049 }
1363static void parseargs(int argc, char *argv[]) 2050static int parseargs(int argc, char *argv[])
1364{ 2051{
1365 int i; 2052 int i;
1366 char *from_file = NULL; 2053 const char *from_file = NULL;
2054 int ret = 0;
2055 char load_cache_config = 0;
1367 2056
1368 opterr = 0; 2057 opterr = 0;
1369 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 2058 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1370 switch (i) { 2059 switch (i) {
1371 2060
1379 case 'f': 2068 case 'f':
1380 if (from_file) warn("You prob don't want to specify -f twice"); 2069 if (from_file) warn("You prob don't want to specify -f twice");
1381 from_file = optarg; 2070 from_file = optarg;
1382 break; 2071 break;
1383 case 'E': 2072 case 'E':
1384 strncpy(match_etypes, optarg, sizeof(match_etypes)); 2073 match_etypes = optarg;
2074 break;
2075 case 'M':
2076 match_bits = atoi(optarg);
2077 if (match_bits == 0) {
2078 if (strcmp(optarg, "ELFCLASS32") == 0)
2079 match_bits = 32;
2080 if (strcmp(optarg, "ELFCLASS64") == 0)
2081 match_bits = 64;
2082 }
2083 break;
2084 case 'O':
2085 if (sscanf(optarg, "%o", &match_perms) == -1)
2086 match_bits = 0;
1385 break; 2087 break;
1386 case 'o': { 2088 case 'o': {
1387 FILE *fp = NULL;
1388 if ((fp = freopen(optarg, "w", stdout)) == NULL) 2089 if (freopen(optarg, "w", stdout) == NULL)
1389 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 2090 errp("Could not freopen(%s)", optarg);
1390 SET_STDOUT(fp);
1391 break; 2091 break;
1392 } 2092 }
1393 2093 case 'k':
2094 xarraypush_str(find_section_arr, optarg);
2095 break;
1394 case 's': { 2096 case 's': {
1395 if (find_sym) warn("You prob don't want to specify -s twice"); 2097 /* historically, this was comma delimited */
1396 find_sym = optarg; 2098 char *this_sym = strtok(optarg, ",");
1397 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1)); 2099 if (!this_sym) /* edge case: -s '' */
1398 sprintf(versioned_symname, "%s@", find_sym); 2100 xarraypush_str(find_sym_arr, "");
2101 while (this_sym) {
2102 xarraypush_str(find_sym_arr, this_sym);
2103 this_sym = strtok(NULL, ",");
2104 }
1399 break; 2105 break;
1400 } 2106 }
1401 case 'N': { 2107 case 'N':
1402 if (find_lib) warn("You prob don't want to specify -N twice"); 2108 xarraypush_str(find_lib_arr, optarg);
1403 find_lib = optarg;
1404 break; 2109 break;
1405 }
1406
1407 case 'F': { 2110 case 'F': {
1408 if (out_format) warn("You prob don't want to specify -F twice"); 2111 if (out_format) warn("You prob don't want to specify -F twice");
1409 out_format = optarg; 2112 out_format = optarg;
1410 break; 2113 break;
1411 } 2114 }
2115 case 'z': {
2116 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
2117 size_t x;
1412 2118
1413 case 'g': gmatch = 1; /* break; any reason we dont breal; here ? */ 2119 for (x = 0; x < strlen(optarg); x++) {
2120 switch (optarg[x]) {
2121 case 'p':
2122 case 'P':
2123 do_pax_state(optarg[x], PAGEEXEC);
2124 break;
2125 case 's':
2126 case 'S':
2127 do_pax_state(optarg[x], SEGMEXEC);
2128 break;
2129 case 'm':
2130 case 'M':
2131 do_pax_state(optarg[x], MPROTECT);
2132 break;
2133 case 'e':
2134 case 'E':
2135 do_pax_state(optarg[x], EMUTRAMP);
2136 break;
2137 case 'r':
2138 case 'R':
2139 do_pax_state(optarg[x], RANDMMAP);
2140 break;
2141 case 'x':
2142 case 'X':
2143 do_pax_state(optarg[x], RANDEXEC);
2144 break;
2145 default:
2146 break;
2147 }
2148 }
2149 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
2150 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
2151 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
2152 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
2153 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
2154 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
2155 setpax = flags;
2156 break;
2157 }
2158 case 'Z': show_size = 1; break;
2159 case 'g': ++g_match; break;
1414 case 'L': use_ldcache = 1; break; 2160 case 'L': load_cache_config = use_ldcache = 1; break;
1415 case 'y': scan_symlink = 0; break; 2161 case 'y': scan_symlink = 0; break;
1416 case 'A': scan_archives = 1; break; 2162 case 'A': scan_archives = 1; break;
2163 case 'C': color_init(true); break;
1417 case 'B': show_banner = 0; break; 2164 case 'B': show_banner = 0; break;
1418 case 'l': scan_ldpath = 1; break; 2165 case 'l': load_cache_config = scan_ldpath = 1; break;
1419 case 'p': scan_envpath = 1; break; 2166 case 'p': scan_envpath = 1; break;
1420 case 'R': dir_recurse = 1; break; 2167 case 'R': dir_recurse = 1; break;
1421 case 'm': dir_crossmount = 0; break; 2168 case 'm': dir_crossmount = 0; break;
1422 case 'X': ++fix_elf; break; 2169 case 'X': ++fix_elf; break;
1423 case 'x': show_pax = 1; break; 2170 case 'x': show_pax = 1; break;
1429 case 'b': show_bind = 1; break; 2176 case 'b': show_bind = 1; break;
1430 case 'S': show_soname = 1; break; 2177 case 'S': show_soname = 1; break;
1431 case 'T': show_textrels = 1; break; 2178 case 'T': show_textrels = 1; break;
1432 case 'q': be_quiet = 1; break; 2179 case 'q': be_quiet = 1; break;
1433 case 'v': be_verbose = (be_verbose % 20) + 1; break; 2180 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1434 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break; 2181 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
1435 2182 case 'D': show_endian = 1; break;
2183 case 'I': show_osabi = 1; break;
2184 case 'Y': show_eabi = 1; break;
2185 case 128:
2186 root_fd = open(optarg, O_RDONLY|O_CLOEXEC);
2187 if (root_fd == -1)
2188 err("Could not open root: %s", optarg);
2189 break;
2190 case 129: load_cache_config = use_ldpath = 1; break;
1436 case ':': 2191 case ':':
1437 err("Option '%c' is missing parameter", optopt); 2192 err("Option '%c' is missing parameter", optopt);
1438 case '?': 2193 case '?':
1439 err("Unknown option '%c' or argument missing", optopt); 2194 err("Unknown option '%c' or argument missing", optopt);
1440 default: 2195 default:
1441 err("Unhandled option '%c'; please report this", i); 2196 err("Unhandled option '%c'; please report this", i);
1442 } 2197 }
1443 } 2198 }
2199 if (show_textrels && be_verbose)
2200 has_objdump = bin_in_path("objdump");
2201 /* precompile all the regexes */
2202 if (g_match) {
2203 regex_t preg;
2204 const char *this_sym;
2205 size_t n;
2206 int flags = REG_EXTENDED | REG_NOSUB | (g_match > 1 ? REG_ICASE : 0);
1444 2207
2208 array_for_each(find_sym_arr, n, this_sym) {
2209 /* see scanelf_match_symname for logic info */
2210 switch (this_sym[0]) {
2211 case '%':
2212 while (*(this_sym++))
2213 if (*this_sym == '%') {
2214 ++this_sym;
2215 break;
2216 }
2217 break;
2218 case '+':
2219 case '-':
2220 ++this_sym;
2221 break;
2222 }
2223 if (*this_sym == '*')
2224 ++this_sym;
2225
2226 ret = regcomp(&preg, this_sym, flags);
2227 if (ret) {
2228 char err[256];
2229 regerror(ret, &preg, err, sizeof(err));
2230 err("regcomp of %s failed: %s", this_sym, err);
2231 }
2232 xarraypush(find_sym_regex_arr, &preg, sizeof(preg));
2233 }
2234 }
2235 /* flatten arrays for display */
2236 if (array_cnt(find_sym_arr))
2237 find_sym = array_flatten_str(find_sym_arr);
2238 if (array_cnt(find_lib_arr))
2239 find_lib = array_flatten_str(find_lib_arr);
2240 if (array_cnt(find_section_arr))
2241 find_section = array_flatten_str(find_section_arr);
1445 /* let the format option override all other options */ 2242 /* let the format option override all other options */
1446 if (out_format) { 2243 if (out_format) {
1447 show_pax = show_phdr = show_textrel = show_rpath = \ 2244 show_pax = show_phdr = show_textrel = show_rpath = \
1448 show_needed = show_interp = show_bind = show_soname = \ 2245 show_needed = show_interp = show_bind = show_soname = \
1449 show_textrels = 0; 2246 show_textrels = show_perms = show_endian = show_size = \
2247 show_osabi = show_eabi = 0;
1450 for (i = 0; out_format[i]; ++i) { 2248 for (i = 0; out_format[i]; ++i) {
1451 if (!IS_MODIFIER(out_format[i])) continue; 2249 if (!IS_MODIFIER(out_format[i])) continue;
1452 2250
1453 switch (out_format[++i]) { 2251 switch (out_format[++i]) {
2252 case '+': break;
1454 case '%': break; 2253 case '%': break;
1455 case '#': break; 2254 case '#': break;
1456 case 'F': break; 2255 case 'F': break;
1457 case 'p': break; 2256 case 'p': break;
1458 case 'f': break; 2257 case 'f': break;
2258 case 'k': break;
1459 case 's': break; 2259 case 's': break;
1460 case 'N': break; 2260 case 'N': break;
1461 case 'o': break; 2261 case 'o': break;
2262 case 'a': break;
2263 case 'M': break;
2264 case 'Z': show_size = 1; break;
2265 case 'D': show_endian = 1; break;
2266 case 'I': show_osabi = 1; break;
2267 case 'Y': show_eabi = 1; break;
2268 case 'O': show_perms = 1; break;
1462 case 'x': show_pax = 1; break; 2269 case 'x': show_pax = 1; break;
1463 case 'e': show_phdr = 1; break; 2270 case 'e': show_phdr = 1; break;
1464 case 't': show_textrel = 1; break; 2271 case 't': show_textrel = 1; break;
1465 case 'r': show_rpath = 1; break; 2272 case 'r': show_rpath = 1; break;
1466 case 'n': show_needed = 1; break; 2273 case 'n': show_needed = 1; break;
1467 case 'i': show_interp = 1; break; 2274 case 'i': show_interp = 1; break;
1468 case 'b': show_bind = 1; break; 2275 case 'b': show_bind = 1; break;
1469 case 'S': show_soname = 1; break; 2276 case 'S': show_soname = 1; break;
1470 case 'T': show_textrels = 1; break; 2277 case 'T': show_textrels = 1; break;
1471 default: 2278 default:
1472 err("Invalid format specifier '%c' (byte %i)", 2279 err("invalid format specifier '%c' (byte %i)",
1473 out_format[i], i+1); 2280 out_format[i], i+1);
1474 } 2281 }
1475 } 2282 }
1476 2283
1477 /* construct our default format */ 2284 /* construct our default format */
1478 } else { 2285 } else {
1479 size_t fmt_len = 30; 2286 size_t fmt_len = 30;
1480 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 2287 out_format = xmalloc(sizeof(char) * fmt_len);
2288 *out_format = '\0';
1481 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 2289 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1482 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len); 2290 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
2291 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
2292 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
2293 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
2294 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
2295 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
1483 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len); 2296 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1484 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 2297 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1485 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 2298 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1486 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 2299 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1487 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 2300 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1488 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len); 2301 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1489 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len); 2302 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1490 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len); 2303 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1491 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len); 2304 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
2305 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1492 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len); 2306 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1493 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 2307 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1494 } 2308 }
1495 if (be_verbose > 2) printf("Format: %s\n", out_format); 2309 if (be_verbose > 2) printf("Format: %s\n", out_format);
1496 2310
1497 /* now lets actually do the scanning */ 2311 /* now lets actually do the scanning */
1498 if (scan_ldpath || use_ldcache) 2312 if (load_cache_config)
1499 load_ld_so_conf(); 2313 load_ld_cache_config(__PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
1500 if (scan_ldpath) scanelf_ldpath(); 2314 if (scan_ldpath) scanelf_ldpath();
1501 if (scan_envpath) scanelf_envpath(); 2315 if (scan_envpath) scanelf_envpath();
2316 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
2317 from_file = "-";
1502 if (from_file) { 2318 if (from_file) {
1503 scanelf_from_file(from_file); 2319 scanelf_from_file(from_file);
1504 from_file = *argv; 2320 from_file = *argv;
1505 } 2321 }
1506 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file) 2322 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1507 err("Nothing to scan !?"); 2323 err("Nothing to scan !?");
1508 while (optind < argc) { 2324 while (optind < argc) {
1509 search_path = argv[optind++]; 2325 search_path = argv[optind++];
1510 scanelf_dir(search_path); 2326 ret = scanelf_dir(search_path);
1511 } 2327 }
1512 2328
1513 /* clean up */ 2329 /* clean up */
1514 if (versioned_symname) free(versioned_symname);
1515 for (i = 0; ldpaths[i]; ++i)
1516 free(ldpaths[i]); 2330 xarrayfree(ldpaths);
2331 xarrayfree(find_sym_arr);
2332 xarrayfree(find_lib_arr);
2333 xarrayfree(find_section_arr);
2334 free(find_sym);
2335 free(find_lib);
2336 free(find_section);
2337 {
2338 size_t n;
2339 regex_t *preg;
2340 array_for_each(find_sym_regex_arr, n, preg)
2341 regfree(preg);
2342 xarrayfree(find_sym_regex_arr);
2343 }
1517 2344
1518 if (ldcache != 0) 2345 if (ldcache != 0)
1519 munmap(ldcache, ldcache_size); 2346 munmap(ldcache, ldcache_size);
1520}
1521
1522
1523
1524/* utility funcs */
1525static char *xstrdup(const char *s)
1526{
1527 char *ret = strdup(s);
1528 if (!ret) err("Could not strdup(): %s", strerror(errno));
1529 return ret; 2347 return ret;
1530} 2348}
1531static void *xmalloc(size_t size)
1532{
1533 void *ret = malloc(size);
1534 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1535 return ret;
1536}
1537static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
1538{
1539 size_t new_len;
1540 2349
1541 new_len = strlen(*dst) + strlen(src); 2350static char **get_split_env(const char *envvar)
1542 if (*curr_len <= new_len) {
1543 *curr_len = new_len + (*curr_len / 2);
1544 *dst = realloc(*dst, *curr_len);
1545 if (!*dst)
1546 err("could not realloc() %li bytes", (unsigned long)*curr_len);
1547 }
1548
1549 if (n)
1550 strncat(*dst, src, n);
1551 else
1552 strcat(*dst, src);
1553}
1554static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1555{ 2351{
1556 static char my_app[2]; 2352 const char *delims = " \t\n";
1557 my_app[0] = append; 2353 char **envvals = NULL;
1558 my_app[1] = '\0'; 2354 char *env, *s;
1559 xstrcat(dst, my_app, curr_len); 2355 int nentry;
1560}
1561 2356
2357 if ((env = getenv(envvar)) == NULL)
2358 return NULL;
1562 2359
2360 env = xstrdup(env);
2361 if (env == NULL)
2362 return NULL;
2363
2364 s = strtok(env, delims);
2365 if (s == NULL) {
2366 free(env);
2367 return NULL;
2368 }
2369
2370 nentry = 0;
2371 while (s != NULL) {
2372 ++nentry;
2373 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
2374 envvals[nentry-1] = s;
2375 s = strtok(NULL, delims);
2376 }
2377 envvals[nentry] = NULL;
2378
2379 /* don't want to free(env) as it contains the memory that backs
2380 * the envvals array of strings */
2381 return envvals;
2382}
2383
2384static void parseenv(void)
2385{
2386 color_init(false);
2387 qa_textrels = get_split_env("QA_TEXTRELS");
2388 qa_execstack = get_split_env("QA_EXECSTACK");
2389 qa_wx_load = get_split_env("QA_WX_LOAD");
2390}
2391
2392#ifdef __PAX_UTILS_CLEANUP
2393static void cleanup(void)
2394{
2395 free(out_format);
2396 free(qa_textrels);
2397 free(qa_execstack);
2398 free(qa_wx_load);
2399}
2400#endif
1563 2401
1564int main(int argc, char *argv[]) 2402int main(int argc, char *argv[])
1565{ 2403{
2404 int ret;
1566 if (argc < 2) 2405 if (argc < 2)
1567 usage(EXIT_FAILURE); 2406 usage(EXIT_FAILURE);
2407 parseenv();
1568 parseargs(argc, argv); 2408 ret = parseargs(argc, argv);
1569 fclose(stdout); 2409 fclose(stdout);
1570#ifdef __BOUNDS_CHECKING_ON 2410#ifdef __PAX_UTILS_CLEANUP
1571 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()"); 2411 cleanup();
2412 warn("The calls to add/delete heap should be off:\n"
2413 "\t- 1 due to the out_buffer not being freed in scanelf_fileat()\n"
2414 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
1572#endif 2415#endif
1573 return EXIT_SUCCESS; 2416 return ret;
1574} 2417}
2418
2419/* Match filename against entries in matchlist, return TRUE
2420 * if the file is listed */
2421static int file_matches_list(const char *filename, char **matchlist)
2422{
2423 char **file;
2424 char *match;
2425 char buf[__PAX_UTILS_PATH_MAX];
2426
2427 if (matchlist == NULL)
2428 return 0;
2429
2430 for (file = matchlist; *file != NULL; file++) {
2431 if (search_path) {
2432 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2433 match = buf;
2434 } else {
2435 match = *file;
2436 }
2437 if (fnmatch(match, filename, 0) == 0)
2438 return 1;
2439 }
2440 return 0;
2441}

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