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

Diff of /pax-utils/scanelf.c

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

Revision 1.119 Revision 1.252
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 1.252 2012/11/18 07:39:45 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 1.252 2012/11/18 07:39:45 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));
143static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load) 319static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
144{ 320{
145 static char ret[12]; 321 static char ret[12];
146 char *found; 322 char *found;
147 unsigned long i, shown, multi_stack, multi_relro, multi_load; 323 unsigned long i, shown, multi_stack, multi_relro, multi_load;
148 int max_pt_load;
149 324
150 if (!show_phdr) return NULL; 325 if (!show_phdr) return NULL;
151 326
152 memcpy(ret, "--- --- ---\0", 12); 327 memcpy(ret, "--- --- ---\0", 12);
153 328
154 shown = 0; 329 shown = 0;
155 multi_stack = multi_relro = multi_load = 0; 330 multi_stack = multi_relro = multi_load = 0;
156 max_pt_load = elf_max_pt_load(elf);
157 331
158#define NOTE_GNU_STACK ".note.GNU-stack" 332#define NOTE_GNU_STACK ".note.GNU-stack"
159#define SHOW_PHDR(B) \ 333#define SHOW_PHDR(B) \
160 if (elf->elf_class == ELFCLASS ## B) { \ 334 if (elf->elf_class == ELFCLASS ## B) { \
161 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 335 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
163 uint32_t flags, check_flags; \ 337 uint32_t flags, check_flags; \
164 if (elf->phdr != NULL) { \ 338 if (elf->phdr != NULL) { \
165 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 339 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
166 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \ 340 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
167 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \ 341 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
342 if (multi_stack++) \
168 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \ 343 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
344 if (file_matches_list(elf->filename, qa_execstack)) \
345 continue; \
169 found = found_phdr; \ 346 found = found_phdr; \
170 offset = 0; \ 347 offset = 0; \
171 check_flags = PF_X; \ 348 check_flags = PF_X; \
172 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \ 349 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
350 if (multi_relro++) \
173 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \ 351 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
174 found = found_relro; \ 352 found = found_relro; \
175 offset = 4; \ 353 offset = 4; \
176 check_flags = PF_X; \ 354 check_flags = PF_X; \
177 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \ 355 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
178 if (ehdr->e_type == ET_DYN || ehdr->e_type == ET_EXEC) \ 356 if (file_matches_list(elf->filename, qa_wx_load)) \
179 if (multi_load++ > max_pt_load) warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \ 357 continue; \
180 found = found_load; \ 358 found = found_load; \
181 offset = 8; \ 359 offset = 8; \
182 check_flags = PF_W|PF_X; \ 360 check_flags = PF_W|PF_X; \
183 } else \ 361 } else \
184 continue; \ 362 continue; \
185 flags = EGET(phdr[i].p_flags); \ 363 flags = EGET(phdr[i].p_flags); \
186 if (be_quiet && ((flags & check_flags) != check_flags)) \ 364 if (be_quiet && ((flags & check_flags) != check_flags)) \
187 continue; \ 365 continue; \
188 if (fix_elf && ((flags & PF_X) != flags)) { \ 366 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)); \ 367 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
190 ret[3] = ret[7] = '!'; \ 368 ret[3] = ret[7] = '!'; \
191 flags = EGET(phdr[i].p_flags); \ 369 flags = EGET(phdr[i].p_flags); \
192 } \ 370 } \
193 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \ 371 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
197 } else if (elf->shdr != NULL) { \ 375 } else if (elf->shdr != NULL) { \
198 /* no program headers which means this is prob an object file */ \ 376 /* no program headers which means this is prob an object file */ \
199 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \ 377 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
200 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \ 378 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
201 char *str; \ 379 char *str; \
202 if ((void*)strtbl > (void*)elf->data_end) \ 380 if ((void*)strtbl > elf->data_end) \
203 goto skip_this_shdr##B; \ 381 goto skip_this_shdr##B; \
204 check_flags = SHF_WRITE|SHF_EXECINSTR; \ 382 check_flags = SHF_WRITE|SHF_EXECINSTR; \
205 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \ 383 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
206 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \ 384 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
207 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \ 385 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
221 break; \ 399 break; \
222 } \ 400 } \
223 } \ 401 } \
224 skip_this_shdr##B: \ 402 skip_this_shdr##B: \
225 if (!multi_stack) { \ 403 if (!multi_stack) { \
404 if (file_matches_list(elf->filename, qa_execstack)) \
405 return NULL; \
226 *found_phdr = 1; \ 406 *found_phdr = 1; \
227 shown = 1; \ 407 shown = 1; \
228 memcpy(ret, "!WX", 3); \ 408 memcpy(ret, "!WX", 3); \
229 } \ 409 } \
230 } \ 410 } \
235 if (be_wewy_wewy_quiet || (be_quiet && !shown)) 415 if (be_wewy_wewy_quiet || (be_quiet && !shown))
236 return NULL; 416 return NULL;
237 else 417 else
238 return ret; 418 return ret;
239} 419}
420
421/*
422 * See if this ELF contains a DT_TEXTREL tag in any of its
423 * PT_DYNAMIC sections.
424 */
240static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 425static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
241{ 426{
242 static const char *ret = "TEXTREL"; 427 static const char *ret = "TEXTREL";
243 unsigned long i; 428 unsigned long i;
244 429
245 if (!show_textrel && !show_textrels) return NULL; 430 if (!show_textrel && !show_textrels) return NULL;
431
432 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
246 433
247 if (elf->phdr) { 434 if (elf->phdr) {
248#define SHOW_TEXTREL(B) \ 435#define SHOW_TEXTREL(B) \
249 if (elf->elf_class == ELFCLASS ## B) { \ 436 if (elf->elf_class == ELFCLASS ## B) { \
250 Elf ## B ## _Dyn *dyn; \ 437 Elf ## B ## _Dyn *dyn; \
251 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 438 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
252 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 439 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
253 Elf ## B ## _Off offset; \ 440 Elf ## B ## _Off offset; \
254 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 441 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
255 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 442 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
256 offset = EGET(phdr[i].p_offset); \ 443 offset = EGET(phdr[i].p_offset); \
257 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 444 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
258 dyn = DYN ## B (elf->data + offset); \ 445 dyn = DYN ## B (elf->vdata + offset); \
259 while (EGET(dyn->d_tag) != DT_NULL) { \ 446 while (EGET(dyn->d_tag) != DT_NULL) { \
260 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \ 447 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
261 *found_textrel = 1; \ 448 *found_textrel = 1; \
262 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \ 449 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
263 return (be_wewy_wewy_quiet ? NULL : ret); \ 450 return (be_wewy_wewy_quiet ? NULL : ret); \
272 if (be_quiet || be_wewy_wewy_quiet) 459 if (be_quiet || be_wewy_wewy_quiet)
273 return NULL; 460 return NULL;
274 else 461 else
275 return " - "; 462 return " - ";
276} 463}
464
465/*
466 * Scan the .text section to see if there are any relocations in it.
467 * Should rewrite this to check PT_LOAD sections that are marked
468 * Executable rather than the section named '.text'.
469 */
277static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel) 470static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
278{ 471{
279 unsigned long s, r, rmax; 472 unsigned long s, r, rmax;
280 void *symtab_void, *strtab_void, *text_void; 473 void *symtab_void, *strtab_void, *text_void;
281 474
302 Elf ## B ## _Rela *rela; \ 495 Elf ## B ## _Rela *rela; \
303 /* search the section headers for relocations */ \ 496 /* search the section headers for relocations */ \
304 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \ 497 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
305 uint32_t sh_type = EGET(shdr[s].sh_type); \ 498 uint32_t sh_type = EGET(shdr[s].sh_type); \
306 if (sh_type == SHT_REL) { \ 499 if (sh_type == SHT_REL) { \
307 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \ 500 rel = REL ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
308 rela = NULL; \ 501 rela = NULL; \
309 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \ 502 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
310 } else if (sh_type == SHT_RELA) { \ 503 } else if (sh_type == SHT_RELA) { \
311 rel = NULL; \ 504 rel = NULL; \
312 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \ 505 rela = RELA ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
313 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \ 506 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
314 } else \ 507 } else \
315 continue; \ 508 continue; \
316 /* now see if any of the relocs are in the .text */ \ 509 /* now see if any of the relocs are in the .text */ \
317 for (r = 0; r < rmax; ++r) { \ 510 for (r = 0; r < rmax; ++r) { \
332 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \ 525 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
333 if (be_verbose <= 2) continue; \ 526 if (be_verbose <= 2) continue; \
334 } else \ 527 } else \
335 *found_textrels = 1; \ 528 *found_textrels = 1; \
336 /* locate this relocation symbol name */ \ 529 /* locate this relocation symbol name */ \
337 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 530 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
338 if ((void*)sym > (void*)elf->data_end) { \ 531 if ((void*)sym > elf->data_end) { \
339 warn("%s: corrupt ELF symbol", elf->filename); \ 532 warn("%s: corrupt ELF symbol", elf->filename); \
340 continue; \ 533 continue; \
341 } \ 534 } \
342 sym_max = ELF ## B ## _R_SYM(r_info); \ 535 sym_max = ELF ## B ## _R_SYM(r_info); \
343 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \ 536 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
346 sym = NULL; \ 539 sym = NULL; \
347 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 540 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
348 /* show the raw details about this reloc */ \ 541 /* show the raw details about this reloc */ \
349 printf(" %s: ", elf->base_filename); \ 542 printf(" %s: ", elf->base_filename); \
350 if (sym && sym->st_name) \ 543 if (sym && sym->st_name) \
351 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \ 544 printf("%s", elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
352 else \ 545 else \
353 printf("(memory/fake?)"); \ 546 printf("(memory/data?)"); \
354 printf(" [0x%lX]", (unsigned long)r_offset); \ 547 printf(" [0x%lX]", (unsigned long)r_offset); \
355 /* now try to find the closest symbol that this rel is probably in */ \ 548 /* now try to find the closest symbol that this rel is probably in */ \
356 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 549 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
357 func = NULL; \ 550 func = NULL; \
358 offset_tmp = 0; \ 551 offset_tmp = 0; \
359 while (sym_max--) { \ 552 while (sym_max--) { \
360 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \ 553 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
361 func = sym; \ 554 func = sym; \
362 offset_tmp = EGET(sym->st_value); \ 555 offset_tmp = EGET(sym->st_value); \
363 } \ 556 } \
364 ++sym; \ 557 ++sym; \
365 } \ 558 } \
366 printf(" in "); \ 559 printf(" in "); \
367 if (func && func->st_name) \ 560 if (func && func->st_name) { \
368 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \ 561 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
562 if (r_offset > EGET(func->st_size)) \
563 printf("(optimized out: previous %s)", func_name); \
369 else \ 564 else \
370 printf("(NULL: fake?)"); \ 565 printf("%s", func_name); \
566 } else \
567 printf("(optimized out)"); \
371 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \ 568 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
569 if (be_verbose && has_objdump) { \
570 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
571 char *sysbuf; \
572 size_t syslen; \
573 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"; \
574 syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
575 sysbuf = xmalloc(syslen); \
576 if (end_addr < r_offset) \
577 /* not uncommon when things are optimized out */ \
578 end_addr = r_offset + 0x100; \
579 snprintf(sysbuf, syslen, sysfmt, \
580 (unsigned long)offset_tmp, \
581 (unsigned long)end_addr, \
582 elf->filename, \
583 (unsigned long)r_offset); \
584 fflush(stdout); \
585 if (system(sysbuf)) /* don't care */; \
586 fflush(stdout); \
587 free(sysbuf); \
588 } \
372 } \ 589 } \
373 } } 590 } }
374 SHOW_TEXTRELS(32) 591 SHOW_TEXTRELS(32)
375 SHOW_TEXTRELS(64) 592 SHOW_TEXTRELS(64)
376 } 593 }
378 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename); 595 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
379 596
380 return NULL; 597 return NULL;
381} 598}
382 599
383static void rpath_security_checks(elfobj *, char *, const char *);
384static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type) 600static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
385{ 601{
386 struct stat st; 602 struct stat st;
387 switch (*item) { 603 switch (*item) {
388 case '/': break; 604 case '/': break;
394 warnf("Security problem NULL %s in %s", dt_type, elf->filename); 610 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
395 break; 611 break;
396 case '$': 612 case '$':
397 if (fstat(elf->fd, &st) != -1) 613 if (fstat(elf->fd, &st) != -1)
398 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID)) 614 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", 615 warnf("Security problem with %s='%s' in %s with mode set of %o",
400 dt_type, item, elf->filename, st.st_mode & 07777); 616 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
401 break; 617 break;
402 default: 618 default:
403 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename); 619 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
404 break; 620 break;
405 } 621 }
406} 622}
407static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len) 623static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
408{ 624{
409 unsigned long i, s; 625 unsigned long i;
410 char *rpath, *runpath, **r; 626 char *rpath, *runpath, **r;
411 void *strtbl_void; 627 void *strtbl_void;
412 628
413 if (!show_rpath) return; 629 if (!show_rpath) return;
414 630
425 Elf ## B ## _Off offset; \ 641 Elf ## B ## _Off offset; \
426 Elf ## B ## _Xword word; \ 642 Elf ## B ## _Xword word; \
427 /* Scan all the program headers */ \ 643 /* Scan all the program headers */ \
428 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 644 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
429 /* Just scan dynamic headers */ \ 645 /* Just scan dynamic headers */ \
430 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 646 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
431 offset = EGET(phdr[i].p_offset); \ 647 offset = EGET(phdr[i].p_offset); \
432 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 648 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
433 /* Just scan dynamic RPATH/RUNPATH headers */ \ 649 /* Just scan dynamic RPATH/RUNPATH headers */ \
434 dyn = DYN ## B (elf->data + offset); \ 650 dyn = DYN ## B (elf->vdata + offset); \
435 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \ 651 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
436 if (word == DT_RPATH) { \ 652 if (word == DT_RPATH) { \
437 r = &rpath; \ 653 r = &rpath; \
438 } else if (word == DT_RUNPATH) { \ 654 } else if (word == DT_RUNPATH) { \
439 r = &runpath; \ 655 r = &runpath; \
443 } \ 659 } \
444 /* Verify the memory is somewhat sane */ \ 660 /* Verify the memory is somewhat sane */ \
445 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 661 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
446 if (offset < (Elf ## B ## _Off)elf->len) { \ 662 if (offset < (Elf ## B ## _Off)elf->len) { \
447 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \ 663 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
448 *r = (char*)(elf->data + offset); \ 664 *r = elf->data + offset; \
449 /* cache the length in case we need to nuke this section later on */ \ 665 /* cache the length in case we need to nuke this section later on */ \
450 if (fix_elf) \ 666 if (fix_elf) \
451 offset = strlen(*r); \ 667 offset = strlen(*r); \
452 /* If quiet, don't output paths in ld.so.conf */ \ 668 /* If quiet, don't output paths in ld.so.conf */ \
453 if (be_quiet) { \ 669 if (be_quiet) { \
459 /* scan each path in : delimited list */ \ 675 /* scan each path in : delimited list */ \
460 while (start) { \ 676 while (start) { \
461 rpath_security_checks(elf, start, get_elfdtype(word)); \ 677 rpath_security_checks(elf, start, get_elfdtype(word)); \
462 end = strchr(start, ':'); \ 678 end = strchr(start, ':'); \
463 len = (end ? abs(end - start) : strlen(start)); \ 679 len = (end ? abs(end - start) : strlen(start)); \
464 if (use_ldcache) \ 680 if (use_ldcache) { \
465 for (s = 0; ldpaths[s]; ++s) \ 681 size_t n; \
682 const char *ldpath; \
683 array_for_each(ldpaths, n, ldpath) \
466 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \ 684 if (!strncmp(ldpath, start, len) && !ldpath[len]) { \
467 *r = end; \ 685 *r = end; \
468 /* corner case ... if RPATH reads "/usr/lib:", we want \ 686 /* corner case ... if RPATH reads "/usr/lib:", we want \
469 * to show ':' rather than '' */ \ 687 * to show ':' rather than '' */ \
470 if (end && end[1] != '\0') \ 688 if (end && end[1] != '\0') \
471 (*r)++; \ 689 (*r)++; \
472 break; \ 690 break; \
473 } \ 691 } \
692 } \
474 if (!*r || !end) \ 693 if (!*r || !end) \
475 break; \ 694 break; \
476 else \ 695 else \
477 start = start + len + 1; \ 696 start = start + len + 1; \
478 } \ 697 } \
563#define FLAG_S390_LIB64 0x0400 782#define FLAG_S390_LIB64 0x0400
564#define FLAG_POWERPC_LIB64 0x0500 783#define FLAG_POWERPC_LIB64 0x0500
565#define FLAG_MIPS64_LIBN32 0x0600 784#define FLAG_MIPS64_LIBN32 0x0600
566#define FLAG_MIPS64_LIBN64 0x0700 785#define FLAG_MIPS64_LIBN64 0x0700
567 786
568static char *lookup_cache_lib(elfobj *, char *); 787#if defined(__GLIBC__) || defined(__UCLIBC__)
788
569static char *lookup_cache_lib(elfobj *elf, char *fname) 789static char *lookup_cache_lib(elfobj *elf, const char *fname)
570{ 790{
571 int fd = 0; 791 int fd;
572 char *strs; 792 char *strs;
573 static char buf[__PAX_UTILS_PATH_MAX] = ""; 793 static char buf[__PAX_UTILS_PATH_MAX] = "";
574 const char *cachefile = "/etc/ld.so.cache"; 794 const char *cachefile = root_rel_path("/etc/ld.so.cache");
575 struct stat st; 795 struct stat st;
576 796
577 typedef struct { 797 typedef struct {
578 char magic[LDSO_CACHE_MAGIC_LEN]; 798 char magic[LDSO_CACHE_MAGIC_LEN];
579 char version[LDSO_CACHE_VER_LEN]; 799 char version[LDSO_CACHE_VER_LEN];
589 libentry_t *libent; 809 libentry_t *libent;
590 810
591 if (fname == NULL) 811 if (fname == NULL)
592 return NULL; 812 return NULL;
593 813
594 if (ldcache == 0) { 814 if (ldcache == NULL) {
595 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1) 815 if (fstatat(root_fd, cachefile, &st, 0))
816 return NULL;
817
818 fd = openat(root_fd, cachefile, O_RDONLY);
819 if (fd == -1)
596 return NULL; 820 return NULL;
597 821
598 /* cache these values so we only map/unmap the cache file once */ 822 /* cache these values so we only map/unmap the cache file once */
599 ldcache_size = st.st_size; 823 ldcache_size = st.st_size;
600 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0); 824 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
601
602 close(fd); 825 close(fd);
603 826
604 if (ldcache == (caddr_t)-1) { 827 if (ldcache == MAP_FAILED) {
605 ldcache = 0; 828 ldcache = NULL;
606 return NULL; 829 return NULL;
607 } 830 }
608 831
609 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN)) 832 if (memcmp(header->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN) ||
833 memcmp(header->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
834 {
835 munmap(ldcache, ldcache_size);
836 ldcache = NULL;
610 return NULL; 837 return NULL;
611 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
612 return NULL;
613 } 838 }
839 } else
840 header = ldcache;
614 841
615 header = (header_t *) ldcache;
616 libent = (libentry_t *) (ldcache + sizeof(header_t)); 842 libent = ldcache + sizeof(header_t);
617 strs = (char *) &libent[header->nlibs]; 843 strs = (char *) &libent[header->nlibs];
618 844
619 for (fd = 0; fd < header->nlibs; fd++) { 845 for (fd = 0; fd < header->nlibs; ++fd) {
620 /* this should be more fine grained, but for now we assume that 846 /* This should be more fine grained, but for now we assume that
621 * diff arches will not be cached together. and we ignore the 847 * diff arches will not be cached together, and we ignore the
622 * the different multilib mips cases. */ 848 * the different multilib mips cases.
849 */
623 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK)) 850 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
624 continue; 851 continue;
625 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK)) 852 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
626 continue; 853 continue;
627 854
628 if (strcmp(fname, strs + libent[fd].sooffset) != 0) 855 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
629 continue; 856 continue;
857
858 /* Return first hit because that is how the ldso rolls */
630 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf)); 859 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
860 break;
631 } 861 }
862
632 return buf; 863 return buf;
633} 864}
634 865
866#elif defined(__NetBSD__)
867static char *lookup_cache_lib(elfobj *elf, const char *fname)
868{
869 static char buf[__PAX_UTILS_PATH_MAX] = "";
870 static struct stat st;
871 size_t n;
872 char *ldpath;
873
874 array_for_each(ldpath, n, ldpath) {
875 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", ldpath, fname) >= sizeof(buf))
876 continue; /* if the pathname is too long, or something went wrong, ignore */
877
878 if (stat(buf, &st) != 0)
879 continue; /* if the lib doesn't exist in *ldpath, look further */
880
881 /* NetBSD doesn't actually do sanity checks, it just loads the file
882 * and if that doesn't work, continues looking in other directories.
883 * This cannot easily be safely emulated, unfortunately. For now,
884 * just assume that if it exists, it's a valid library. */
885
886 return buf;
887 }
888
889 /* not found in any path */
890 return NULL;
891}
892#else
893#ifdef __ELF__
894#warning Cache support not implemented for your target
895#endif
896static char *lookup_cache_lib(elfobj *elf, const char *fname)
897{
898 return NULL;
899}
900#endif
901
902static char *lookup_config_lib(elfobj *elf, char *fname)
903{
904 static char buf[__PAX_UTILS_PATH_MAX] = "";
905 const char *ldpath;
906 size_t n;
907
908 array_for_each(ldpaths, n, ldpath) {
909 snprintf(buf, sizeof(buf), "%s/%s", root_rel_path(ldpath), fname);
910 if (faccessat(root_fd, buf, F_OK, AT_SYMLINK_NOFOLLOW) == 0)
911 return buf;
912 }
913
914 return NULL;
915}
635 916
636static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len) 917static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
637{ 918{
638 unsigned long i; 919 unsigned long i;
639 char *needed; 920 char *needed;
640 void *strtbl_void; 921 void *strtbl_void;
641 char *p; 922 char *p;
642 923
924 /*
925 * -n -> op==0 -> print all
926 * -N -> op==1 -> print requested
927 */
643 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL; 928 if ((op == 0 && !show_needed) || (op == 1 && !find_lib))
929 return NULL;
644 930
645 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 931 strtbl_void = elf_findsecbyname(elf, ".dynstr");
646 932
647 if (elf->phdr && strtbl_void) { 933 if (elf->phdr && strtbl_void) {
648#define SHOW_NEEDED(B) \ 934#define SHOW_NEEDED(B) \
650 Elf ## B ## _Dyn *dyn; \ 936 Elf ## B ## _Dyn *dyn; \
651 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 937 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
652 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 938 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
653 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 939 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
654 Elf ## B ## _Off offset; \ 940 Elf ## B ## _Off offset; \
941 size_t matched = 0; \
942 /* Walk all the program headers to find the PT_DYNAMIC */ \
655 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 943 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
656 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 944 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) \
945 continue; \
657 offset = EGET(phdr[i].p_offset); \ 946 offset = EGET(phdr[i].p_offset); \
658 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 947 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
948 continue; \
949 /* Walk all the dynamic tags to find NEEDED entries */ \
659 dyn = DYN ## B (elf->data + offset); \ 950 dyn = DYN ## B (elf->vdata + offset); \
660 while (EGET(dyn->d_tag) != DT_NULL) { \ 951 while (EGET(dyn->d_tag) != DT_NULL) { \
661 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 952 if (EGET(dyn->d_tag) == DT_NEEDED) { \
662 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 953 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
663 if (offset >= (Elf ## B ## _Off)elf->len) { \ 954 if (offset >= (Elf ## B ## _Off)elf->len) { \
664 ++dyn; \ 955 ++dyn; \
665 continue; \ 956 continue; \
666 } \ 957 } \
667 needed = (char*)(elf->data + offset); \ 958 needed = elf->data + offset; \
668 if (op == 0) { \ 959 if (op == 0) { \
960 /* -n -> print all entries */ \
669 if (!be_wewy_wewy_quiet) { \ 961 if (!be_wewy_wewy_quiet) { \
670 if (*found_needed) xchrcat(ret, ',', ret_len); \ 962 if (*found_needed) xchrcat(ret, ',', ret_len); \
671 if (use_ldcache) \ 963 if (use_ldpath) { \
964 if ((p = lookup_config_lib(elf, needed)) != NULL) \
965 needed = p; \
966 } else if (use_ldcache) { \
672 if ((p = lookup_cache_lib(elf, needed)) != NULL) \ 967 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
673 needed = p; \ 968 needed = p; \
969 } \
674 xstrcat(ret, needed, ret_len); \ 970 xstrcat(ret, needed, ret_len); \
675 } \ 971 } \
676 *found_needed = 1; \ 972 *found_needed = 1; \
677 } else { \ 973 } else { \
678 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \ 974 /* -N -> print matching entries */ \
975 size_t n; \
976 const char *find_lib_name; \
977 \
978 array_for_each(find_lib_arr, n, find_lib_name) { \
979 int invert = 1; \
980 if (find_lib_name[0] == '!') \
981 invert = 0, ++find_lib_name; \
982 if (!strcmp(find_lib_name, needed) == invert) \
983 ++matched; \
984 } \
985 \
986 if (matched == array_cnt(find_lib_arr)) { \
679 *found_lib = 1; \ 987 *found_lib = 1; \
680 return (be_wewy_wewy_quiet ? NULL : needed); \ 988 return (be_wewy_wewy_quiet ? NULL : find_lib); \
681 } \ 989 } \
682 } \ 990 } \
683 } \ 991 } \
684 ++dyn; \ 992 ++dyn; \
685 } \ 993 } \
707 *found_interp = 1; \ 1015 *found_interp = 1; \
708 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \ 1016 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
709 } 1017 }
710 SHOW_INTERP(32) 1018 SHOW_INTERP(32)
711 SHOW_INTERP(64) 1019 SHOW_INTERP(64)
1020 } else {
1021 /* Walk all the program headers to find the PT_INTERP */
1022#define SHOW_PT_INTERP(B) \
1023 if (elf->elf_class == ELFCLASS ## B) { \
1024 unsigned long i; \
1025 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1026 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1027 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1028 if (EGET(phdr[i].p_type) != PT_INTERP) \
1029 continue; \
1030 *found_interp = 1; \
1031 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(phdr[i].p_offset)); \
1032 } \
712 } 1033 }
1034 SHOW_PT_INTERP(32)
1035 SHOW_PT_INTERP(64)
1036 }
1037
713 return NULL; 1038 return NULL;
714} 1039}
715static char *scanelf_file_bind(elfobj *elf, char *found_bind) 1040static char *scanelf_file_bind(elfobj *elf, char *found_bind)
716{ 1041{
717 unsigned long i; 1042 unsigned long i;
718 struct stat s; 1043 struct stat s;
1044 char dynamic = 0;
719 1045
720 if (!show_bind) return NULL; 1046 if (!show_bind) return NULL;
721 if (!elf->phdr) return NULL; 1047 if (!elf->phdr) return NULL;
722 1048
723#define SHOW_BIND(B) \ 1049#define SHOW_BIND(B) \
725 Elf ## B ## _Dyn *dyn; \ 1051 Elf ## B ## _Dyn *dyn; \
726 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 1052 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
727 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 1053 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
728 Elf ## B ## _Off offset; \ 1054 Elf ## B ## _Off offset; \
729 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 1055 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
730 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 1056 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1057 dynamic = 1; \
731 offset = EGET(phdr[i].p_offset); \ 1058 offset = EGET(phdr[i].p_offset); \
732 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 1059 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
733 dyn = DYN ## B (elf->data + offset); \ 1060 dyn = DYN ## B (elf->vdata + offset); \
734 while (EGET(dyn->d_tag) != DT_NULL) { \ 1061 while (EGET(dyn->d_tag) != DT_NULL) { \
735 if (EGET(dyn->d_tag) == DT_BIND_NOW || \ 1062 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
736 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \ 1063 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
737 { \ 1064 { \
738 if (be_quiet) return NULL; \ 1065 if (be_quiet) return NULL; \
746 SHOW_BIND(32) 1073 SHOW_BIND(32)
747 SHOW_BIND(64) 1074 SHOW_BIND(64)
748 1075
749 if (be_wewy_wewy_quiet) return NULL; 1076 if (be_wewy_wewy_quiet) return NULL;
750 1077
1078 /* 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)) { 1079 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
752 return NULL; 1080 return NULL;
753 } else { 1081 } else {
754 *found_bind = 1; 1082 *found_bind = 1;
755 return (char *) "LAZY"; 1083 return (char *)(dynamic ? "LAZY" : "STATIC");
756 } 1084 }
757} 1085}
758static char *scanelf_file_soname(elfobj *elf, char *found_soname) 1086static char *scanelf_file_soname(elfobj *elf, char *found_soname)
759{ 1087{
760 unsigned long i; 1088 unsigned long i;
772 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 1100 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
773 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 1101 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
774 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 1102 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
775 Elf ## B ## _Off offset; \ 1103 Elf ## B ## _Off offset; \
776 /* only look for soname in shared objects */ \ 1104 /* only look for soname in shared objects */ \
777 if (ehdr->e_type != ET_DYN) \ 1105 if (EGET(ehdr->e_type) != ET_DYN) \
778 return NULL; \ 1106 return NULL; \
779 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 1107 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
780 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 1108 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
781 offset = EGET(phdr[i].p_offset); \ 1109 offset = EGET(phdr[i].p_offset); \
782 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 1110 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
783 dyn = DYN ## B (elf->data + offset); \ 1111 dyn = DYN ## B (elf->vdata + offset); \
784 while (EGET(dyn->d_tag) != DT_NULL) { \ 1112 while (EGET(dyn->d_tag) != DT_NULL) { \
785 if (EGET(dyn->d_tag) == DT_SONAME) { \ 1113 if (EGET(dyn->d_tag) == DT_SONAME) { \
786 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 1114 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
787 if (offset >= (Elf ## B ## _Off)elf->len) { \ 1115 if (offset >= (Elf ## B ## _Off)elf->len) { \
788 ++dyn; \ 1116 ++dyn; \
789 continue; \ 1117 continue; \
790 } \ 1118 } \
791 soname = (char*)(elf->data + offset); \ 1119 soname = elf->data + offset; \
792 *found_soname = 1; \ 1120 *found_soname = 1; \
793 return (be_wewy_wewy_quiet ? NULL : soname); \ 1121 return (be_wewy_wewy_quiet ? NULL : soname); \
794 } \ 1122 } \
795 ++dyn; \ 1123 ++dyn; \
796 } \ 1124 } \
799 SHOW_SONAME(64) 1127 SHOW_SONAME(64)
800 } 1128 }
801 1129
802 return NULL; 1130 return NULL;
803} 1131}
1132
1133/*
1134 * We support the symbol form:
1135 * [%[modifiers]%][[+-]<symbol name>][,[.....]]
1136 * If the symbol name is empty, then all symbols are matched.
1137 * If the symbol name is a glob ("*"), then all symbols are dumped (debug).
1138 * Do not rely on this output format at all.
1139 * Otherwise the symbol name is used to search (either regex or string compare).
1140 * If the first char of the symbol name is a plus ("+"), then only match
1141 * defined symbols. If it's a minus ("-"), only match undefined symbols.
1142 * Putting modifiers in between the percent signs allows for more in depth
1143 * filters. There are groups of modifiers. If you don't specify a member
1144 * of a group, then all types in that group are matched. The current
1145 * groups and their types are:
1146 * STT group: STT_NOTYPE:n STT_OBJECT:o STT_FUNC:f STT_FILE:F
1147 * STB group: STB_LOCAL:l STB_GLOBAL:g STB_WEAK:w
1148 * SHN group: SHN_UNDEF:u SHN_ABS:a SHN_COMMON:c {defined}:d
1149 * The "defined" value in the SHN group does not correspond to a SHN_xxx define.
1150 * You can search for multiple symbols at once by seperating with a comma (",").
1151 *
1152 * Some examples:
1153 * ELFs with a weak function "foo":
1154 * scanelf -s %wf%foo <ELFs>
1155 * ELFs that define the symbol "main":
1156 * scanelf -s +main <ELFs>
1157 * scanelf -s %d%main <ELFs>
1158 * ELFs that refer to the undefined symbol "brk":
1159 * scanelf -s -brk <ELFs>
1160 * scanelf -s %u%brk <ELFs>
1161 * All global defined objects in an ELF:
1162 * scanelf -s %ogd% <ELF>
1163 */
1164static void
1165scanelf_match_symname(elfobj *elf, char *found_sym, char **ret, size_t *ret_len, const char *symname,
1166 unsigned int stt, unsigned int stb, unsigned int shn, unsigned long size)
1167{
1168 const char *this_sym;
1169 size_t n;
1170
1171 array_for_each(find_sym_arr, n, this_sym) {
1172 bool inc_notype, inc_object, inc_func, inc_file,
1173 inc_local, inc_global, inc_weak,
1174 inc_def, inc_undef, inc_abs, inc_common;
1175
1176 /* symbol selection! */
1177 inc_notype = inc_object = inc_func = inc_file = \
1178 inc_local = inc_global = inc_weak = \
1179 inc_def = inc_undef = inc_abs = inc_common = \
1180 (*this_sym != '%');
1181
1182 /* parse the contents of %...% */
1183 if (!inc_notype) {
1184 while (*(this_sym++)) {
1185 if (*this_sym == '%') {
1186 ++this_sym;
1187 break;
1188 }
1189 switch (*this_sym) {
1190 case 'n': inc_notype = true; break;
1191 case 'o': inc_object = true; break;
1192 case 'f': inc_func = true; break;
1193 case 'F': inc_file = true; break;
1194 case 'l': inc_local = true; break;
1195 case 'g': inc_global = true; break;
1196 case 'w': inc_weak = true; break;
1197 case 'd': inc_def = true; break;
1198 case 'u': inc_undef = true; break;
1199 case 'a': inc_abs = true; break;
1200 case 'c': inc_common = true; break;
1201 default: err("invalid symbol selector '%c'", *this_sym);
1202 }
1203 }
1204
1205 /* If no types are matched, not match all */
1206 if (!inc_notype && !inc_object && !inc_func && !inc_file)
1207 inc_notype = inc_object = inc_func = inc_file = true;
1208 if (!inc_local && !inc_global && !inc_weak)
1209 inc_local = inc_global = inc_weak = true;
1210 if (!inc_def && !inc_undef && !inc_abs && !inc_common)
1211 inc_def = inc_undef = inc_abs = inc_common = true;
1212
1213 /* backwards compat for defined/undefined short hand */
1214 } else if (*this_sym == '+') {
1215 inc_undef = false;
1216 ++this_sym;
1217 } else if (*this_sym == '-') {
1218 inc_def = inc_abs = inc_common = false;
1219 ++this_sym;
1220 }
1221
1222 /* filter symbols */
1223 if ((!inc_notype && stt == STT_NOTYPE) || \
1224 (!inc_object && stt == STT_OBJECT) || \
1225 (!inc_func && stt == STT_FUNC ) || \
1226 (!inc_file && stt == STT_FILE ) || \
1227 (!inc_local && stb == STB_LOCAL ) || \
1228 (!inc_global && stb == STB_GLOBAL) || \
1229 (!inc_weak && stb == STB_WEAK ) || \
1230 (!inc_def && shn && shn < SHN_LORESERVE) || \
1231 (!inc_undef && shn == SHN_UNDEF ) || \
1232 (!inc_abs && shn == SHN_ABS ) || \
1233 (!inc_common && shn == SHN_COMMON))
1234 continue;
1235
1236 if (*this_sym == '*') {
1237 /* a "*" symbol gets you debug output */
1238 printf("%s(%s) %5lX %15s %15s %15s %s\n",
1239 ((*found_sym == 0) ? "\n\t" : "\t"),
1240 elf->base_filename,
1241 size,
1242 get_elfstttype(stt),
1243 get_elfstbtype(stb),
1244 get_elfshntype(shn),
1245 symname);
1246 goto matched;
1247
1248 } else {
1249 if (g_match) {
1250 /* regex match the symbol */
1251 if (regexec(find_sym_regex_arr->eles[n], symname, 0, NULL, 0) == REG_NOMATCH)
1252 continue;
1253
1254 } else if (*this_sym) {
1255 /* give empty symbols a "pass", else do a normal compare */
1256 const size_t len = strlen(this_sym);
1257 if (!(strncmp(this_sym, symname, len) == 0 &&
1258 /* Accept unversioned symbol names */
1259 (symname[len] == '\0' || symname[len] == '@')))
1260 continue;
1261 }
1262
1263 if (be_semi_verbose) {
1264 char buf[1024];
1265 snprintf(buf, sizeof(buf), "%lX %s %s",
1266 size,
1267 get_elfstttype(stt),
1268 this_sym);
1269 *ret = xstrdup(buf);
1270 } else {
1271 if (*ret) xchrcat(ret, ',', ret_len);
1272 xstrcat(ret, symname, ret_len);
1273 }
1274
1275 goto matched;
1276 }
1277 }
1278
1279 return;
1280
1281 matched:
1282 *found_sym = 1;
1283}
1284
804static char *scanelf_file_sym(elfobj *elf, char *found_sym) 1285static const char *scanelf_file_sym(elfobj *elf, char *found_sym)
805{ 1286{
806 unsigned long i;
807 char *ret; 1287 char *ret;
808 void *symtab_void, *strtab_void; 1288 void *symtab_void, *strtab_void;
809 1289
810 if (!find_sym) return NULL; 1290 if (!find_sym) return NULL;
811 ret = find_sym; 1291 ret = NULL;
812 1292
813 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void); 1293 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
814 1294
815 if (symtab_void && strtab_void) { 1295 if (symtab_void && strtab_void) {
816#define FIND_SYM(B) \ 1296#define FIND_SYM(B) \
817 if (elf->elf_class == ELFCLASS ## B) { \ 1297 if (elf->elf_class == ELFCLASS ## B) { \
818 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 1298 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
819 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 1299 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
820 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 1300 Elf ## B ## _Sym *sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
821 unsigned long cnt = EGET(symtab->sh_entsize); \ 1301 Elf ## B ## _Word i, cnt = EGET(symtab->sh_entsize); \
822 char *symname; \ 1302 char *symname; \
1303 size_t ret_len = 0; \
823 if (cnt) \ 1304 if (cnt) \
824 cnt = EGET(symtab->sh_size) / cnt; \ 1305 cnt = EGET(symtab->sh_size) / cnt; \
825 for (i = 0; i < cnt; ++i) { \ 1306 for (i = 0; i < cnt; ++i) { \
1307 if ((void*)sym > elf->data_end) { \
1308 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1309 goto break_out; \
1310 } \
826 if (sym->st_name) { \ 1311 if (sym->st_name) { \
1312 /* make sure the symbol name is in acceptable memory range */ \
827 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 1313 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
828 if ((void*)symname > (void*)elf->data_end) { \ 1314 if ((void*)symname > elf->data_end) { \
829 warnf("%s: corrupt ELF symbols", elf->filename); \ 1315 warnf("%s: corrupt ELF symbols", elf->filename); \
1316 ++sym; \
830 continue; \ 1317 continue; \
831 } \ 1318 } \
832 if (*find_sym == '*') { \ 1319 scanelf_match_symname(elf, found_sym, \
833 printf("%s(%s) %5lX %15s %s\n", \ 1320 &ret, &ret_len, symname, \
834 ((*found_sym == 0) ? "\n\t" : "\t"), \ 1321 ELF##B##_ST_TYPE(EGET(sym->st_info)), \
835 elf->base_filename, \ 1322 ELF##B##_ST_BIND(EGET(sym->st_info)), \
836 (unsigned long)sym->st_size, \ 1323 EGET(sym->st_shndx), \
837 get_elfstttype(sym->st_info), \ 1324 /* st_size can be 64bit, but no one is really that big, so screw em */ \
838 symname); \ 1325 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 } \ 1326 } \
857 ++sym; \ 1327 ++sym; \
858 } } 1328 } \
1329 }
859 FIND_SYM(32) 1330 FIND_SYM(32)
860 FIND_SYM(64) 1331 FIND_SYM(64)
861 } 1332 }
862 1333
863break_out: 1334break_out:
866 if (*find_sym != '*' && *found_sym) 1337 if (*find_sym != '*' && *found_sym)
867 return ret; 1338 return ret;
868 if (be_quiet) 1339 if (be_quiet)
869 return NULL; 1340 return NULL;
870 else 1341 else
871 return (char *)" - "; 1342 return " - ";
872} 1343}
873 1344
1345static const char *scanelf_file_sections(elfobj *elf, char *found_section)
1346{
1347 if (!find_section)
1348 return NULL;
1349
1350#define FIND_SECTION(B) \
1351 if (elf->elf_class == ELFCLASS ## B) { \
1352 size_t matched, n; \
1353 int invert; \
1354 const char *section_name; \
1355 Elf ## B ## _Shdr *section; \
1356 \
1357 matched = 0; \
1358 array_for_each(find_section_arr, n, section_name) { \
1359 invert = (*section_name == '!' ? 1 : 0); \
1360 section = SHDR ## B (elf_findsecbyname(elf, section_name + invert)); \
1361 if ((section == NULL && invert) || (section != NULL && !invert)) \
1362 ++matched; \
1363 } \
1364 \
1365 if (matched == array_cnt(find_section_arr)) \
1366 *found_section = 1; \
1367 }
1368 FIND_SECTION(32)
1369 FIND_SECTION(64)
1370
1371 if (be_wewy_wewy_quiet)
1372 return NULL;
1373
1374 if (*found_section)
1375 return find_section;
1376
1377 if (be_quiet)
1378 return NULL;
1379 else
1380 return " - ";
1381}
874 1382
875/* scan an elf file and show all the fun stuff */ 1383/* scan an elf file and show all the fun stuff */
876#define prints(str) write(fileno(stdout), str, strlen(str)) 1384#define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
877static int scanelf_elfobj(elfobj *elf) 1385static int scanelf_elfobj(elfobj *elf)
878{ 1386{
879 unsigned long i; 1387 unsigned long i;
880 char found_pax, found_phdr, found_relro, found_load, found_textrel, 1388 char found_pax, found_phdr, found_relro, found_load, found_textrel,
881 found_rpath, found_needed, found_interp, found_bind, found_soname, 1389 found_rpath, found_needed, found_interp, found_bind, found_soname,
882 found_sym, found_lib, found_file, found_textrels; 1390 found_sym, found_lib, found_file, found_textrels, found_section;
883 static char *out_buffer = NULL; 1391 static char *out_buffer = NULL;
884 static size_t out_len; 1392 static size_t out_len;
885 1393
886 found_pax = found_phdr = found_relro = found_load = found_textrel = \ 1394 found_pax = found_phdr = found_relro = found_load = found_textrel = \
887 found_rpath = found_needed = found_interp = found_bind = found_soname = \ 1395 found_rpath = found_needed = found_interp = found_bind = found_soname = \
888 found_sym = found_lib = found_file = found_textrels = 0; 1396 found_sym = found_lib = found_file = found_textrels = found_section = 0;
889 1397
890 if (be_verbose > 2) 1398 if (be_verbose > 2)
891 printf("%s: scanning file {%s,%s}\n", elf->filename, 1399 printf("%s: scanning file {%s,%s}\n", elf->filename,
892 get_elfeitype(EI_CLASS, elf->elf_class), 1400 get_elfeitype(EI_CLASS, elf->elf_class),
893 get_elfeitype(EI_DATA, elf->data[EI_DATA])); 1401 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
895 printf("%s: scanning file\n", elf->filename); 1403 printf("%s: scanning file\n", elf->filename);
896 1404
897 /* init output buffer */ 1405 /* init output buffer */
898 if (!out_buffer) { 1406 if (!out_buffer) {
899 out_len = sizeof(char) * 80; 1407 out_len = sizeof(char) * 80;
900 out_buffer = (char*)xmalloc(out_len); 1408 out_buffer = xmalloc(out_len);
901 } 1409 }
902 *out_buffer = '\0'; 1410 *out_buffer = '\0';
903 1411
904 /* show the header */ 1412 /* show the header */
905 if (!be_quiet && show_banner) { 1413 if (!be_quiet && show_banner) {
906 for (i = 0; out_format[i]; ++i) { 1414 for (i = 0; out_format[i]; ++i) {
907 if (!IS_MODIFIER(out_format[i])) continue; 1415 if (!IS_MODIFIER(out_format[i])) continue;
908 1416
909 switch (out_format[++i]) { 1417 switch (out_format[++i]) {
1418 case '+': break;
910 case '%': break; 1419 case '%': break;
911 case '#': break; 1420 case '#': break;
912 case 'F': 1421 case 'F':
913 case 'p': 1422 case 'p':
914 case 'f': prints("FILE "); found_file = 1; break; 1423 case 'f': prints("FILE "); found_file = 1; break;
915 case 'o': prints(" TYPE "); break; 1424 case 'o': prints(" TYPE "); break;
916 case 'x': prints(" PAX "); break; 1425 case 'x': prints(" PAX "); break;
917 case 'e': prints("STK/REL/PTL "); break; 1426 case 'e': prints("STK/REL/PTL "); break;
918 case 't': prints("TEXTREL "); break; 1427 case 't': prints("TEXTREL "); break;
919 case 'r': prints("RPATH "); break; 1428 case 'r': prints("RPATH "); break;
1429 case 'M': prints("CLASS "); break;
1430 case 'l':
920 case 'n': prints("NEEDED "); break; 1431 case 'n': prints("NEEDED "); break;
921 case 'i': prints("INTERP "); break; 1432 case 'i': prints("INTERP "); break;
922 case 'b': prints("BIND "); break; 1433 case 'b': prints("BIND "); break;
1434 case 'Z': prints("SIZE "); break;
923 case 'S': prints("SONAME "); break; 1435 case 'S': prints("SONAME "); break;
924 case 's': prints("SYM "); break; 1436 case 's': prints("SYM "); break;
925 case 'N': prints("LIB "); break; 1437 case 'N': prints("LIB "); break;
926 case 'T': prints("TEXTRELS "); break; 1438 case 'T': prints("TEXTRELS "); break;
1439 case 'k': prints("SECTION "); break;
1440 case 'a': prints("ARCH "); break;
1441 case 'I': prints("OSABI "); break;
1442 case 'Y': prints("EABI "); break;
1443 case 'O': prints("PERM "); break;
1444 case 'D': prints("ENDIAN "); break;
927 default: warnf("'%c' has no title ?", out_format[i]); 1445 default: warnf("'%c' has no title ?", out_format[i]);
928 } 1446 }
929 } 1447 }
930 if (!found_file) prints("FILE "); 1448 if (!found_file) prints("FILE ");
931 prints("\n"); 1449 prints("\n");
935 1453
936 /* dump all the good stuff */ 1454 /* dump all the good stuff */
937 for (i = 0; out_format[i]; ++i) { 1455 for (i = 0; out_format[i]; ++i) {
938 const char *out; 1456 const char *out;
939 const char *tmp; 1457 const char *tmp;
940 1458 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])) { 1459 if (!IS_MODIFIER(out_format[i])) {
946 xchrcat(&out_buffer, out_format[i], &out_len); 1460 xchrcat(&out_buffer, out_format[i], &out_len);
947 continue; 1461 continue;
948 } 1462 }
949 1463
950 out = NULL; 1464 out = NULL;
951 be_wewy_wewy_quiet = (out_format[i] == '#'); 1465 be_wewy_wewy_quiet = (out_format[i] == '#');
1466 be_semi_verbose = (out_format[i] == '+');
952 switch (out_format[++i]) { 1467 switch (out_format[++i]) {
1468 case '+':
953 case '%': 1469 case '%':
954 case '#': 1470 case '#':
955 xchrcat(&out_buffer, out_format[i], &out_len); break; 1471 xchrcat(&out_buffer, out_format[i], &out_len); break;
956 case 'F': 1472 case 'F':
957 found_file = 1; 1473 found_file = 1;
983 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1499 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; 1500 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; 1501 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
986 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break; 1502 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; 1503 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1504 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1505 case 'D': out = get_endian(elf); break;
1506 case 'O': out = strfileperms(elf->filename); break;
988 case 'n': 1507 case 'n':
989 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break; 1508 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; 1509 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
991 case 'b': out = scanelf_file_bind(elf, &found_bind); break; 1510 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
992 case 'S': out = scanelf_file_soname(elf, &found_soname); break; 1511 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
993 case 's': out = scanelf_file_sym(elf, &found_sym); break; 1512 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1513 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1514 case 'a': out = get_elfemtype(elf); break;
1515 case 'I': out = get_elfosabi(elf); break;
1516 case 'Y': out = get_elf_eabi(elf); break;
1517 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]); 1518 default: warnf("'%c' has no scan code?", out_format[i]);
995 } 1519 }
996 if (out) { 1520 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); 1521 xstrcat(&out_buffer, out, &out_len);
1002 }
1003 } 1522 }
1004 1523
1005#define FOUND_SOMETHING() \ 1524#define FOUND_SOMETHING() \
1006 (found_pax || found_phdr || found_relro || found_load || found_textrel || \ 1525 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1007 found_rpath || found_needed || found_interp || found_bind || \ 1526 found_rpath || found_needed || found_interp || found_bind || \
1008 found_soname || found_sym || found_lib || found_textrels) 1527 found_soname || found_sym || found_lib || found_textrels || found_section )
1009 1528
1010 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) { 1529 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1011 xchrcat(&out_buffer, ' ', &out_len); 1530 xchrcat(&out_buffer, ' ', &out_len);
1012 xstrcat(&out_buffer, elf->filename, &out_len); 1531 xstrcat(&out_buffer, elf->filename, &out_len);
1013 } 1532 }
1020} 1539}
1021 1540
1022/* scan a single elf */ 1541/* scan a single elf */
1023static int scanelf_elf(const char *filename, int fd, size_t len) 1542static int scanelf_elf(const char *filename, int fd, size_t len)
1024{ 1543{
1025 int ret; 1544 int ret = 1;
1026 elfobj *elf; 1545 elfobj *elf;
1027 1546
1028 /* verify this is real ELF */ 1547 /* verify this is real ELF */
1029 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) { 1548 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1030 if (be_verbose > 2) printf("%s: not an ELF\n", filename); 1549 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1031 return 1; 1550 return 2;
1032 } 1551 }
1033 1552 switch (match_bits) {
1553 case 32:
1554 if (elf->elf_class != ELFCLASS32)
1555 goto label_done;
1556 break;
1557 case 64:
1558 if (elf->elf_class != ELFCLASS64)
1559 goto label_done;
1560 break;
1561 default: break;
1562 }
1034 if (strlen(match_etypes)) { 1563 if (match_etypes) {
1035 char sbuf[126]; 1564 char sbuf[126];
1036 strncpy(sbuf, match_etypes, sizeof(sbuf)); 1565 strncpy(sbuf, match_etypes, sizeof(sbuf));
1037 if (strchr(match_etypes, ',') != NULL) { 1566 if (strchr(match_etypes, ',') != NULL) {
1038 char *p; 1567 char *p;
1039 while((p = strrchr(sbuf, ',')) != NULL) { 1568 while ((p = strrchr(sbuf, ',')) != NULL) {
1040 *p = 0; 1569 *p = 0;
1041 if (atoi(p+1) == get_etype(elf)) 1570 if (etype_lookup(p+1) == get_etype(elf))
1042 goto label_ret; 1571 goto label_ret;
1043 } 1572 }
1044 } 1573 }
1045 if (atoi(sbuf) != get_etype(elf)) { 1574 if (etype_lookup(sbuf) != get_etype(elf))
1046 ret = 1;
1047 goto label_done; 1575 goto label_done;
1048 }
1049 } 1576 }
1050 1577
1051label_ret: 1578label_ret:
1052 ret = scanelf_elfobj(elf); 1579 ret = scanelf_elfobj(elf);
1053 1580
1066 1593
1067 ar = ar_open_fd(filename, fd); 1594 ar = ar_open_fd(filename, fd);
1068 if (ar == NULL) 1595 if (ar == NULL)
1069 return 1; 1596 return 1;
1070 1597
1071 ar_buffer = (char*)mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0); 1598 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) { 1599 while ((m = ar_next(ar)) != NULL) {
1600 off_t cur_pos = lseek(fd, 0, SEEK_CUR);
1601 if (cur_pos == -1)
1602 errp("lseek() failed");
1073 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size); 1603 elf = readelf_buffer(m->name, ar_buffer + cur_pos, m->size);
1074 if (elf) { 1604 if (elf) {
1075 scanelf_elfobj(elf); 1605 scanelf_elfobj(elf);
1076 unreadelf(elf); 1606 unreadelf(elf);
1077 } 1607 }
1078 } 1608 }
1079 munmap(ar_buffer, len); 1609 munmap(ar_buffer, len);
1080 1610
1081 return 0; 1611 return 0;
1082} 1612}
1083/* scan a file which may be an elf or an archive or some other magical beast */ 1613/* scan a file which may be an elf or an archive or some other magical beast */
1084static void scanelf_file(const char *filename) 1614static int scanelf_fileat(int dir_fd, const char *filename, const struct stat *st_cache)
1085{ 1615{
1616 const struct stat *st = st_cache;
1086 struct stat st; 1617 struct stat symlink_st;
1087 int fd; 1618 int fd;
1088 1619
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 */ 1620 /* always handle regular files and handle symlinked files if no -y */
1096 if (S_ISLNK(st.st_mode)) { 1621 if (S_ISLNK(st->st_mode)) {
1097 if (!scan_symlink) return; 1622 if (!scan_symlink)
1098 stat(filename, &st); 1623 return 1;
1624 fstatat(dir_fd, filename, &symlink_st, 0);
1625 st = &symlink_st;
1099 } 1626 }
1627
1100 if (!S_ISREG(st.st_mode)) { 1628 if (!S_ISREG(st->st_mode)) {
1101 if (be_verbose > 2) printf("%s: skipping non-file\n", filename); 1629 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1102 return; 1630 return 1;
1103 } 1631 }
1104 1632
1105 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1) 1633 if (match_perms) {
1634 if ((st->st_mode | match_perms) != st->st_mode)
1635 return 1;
1636 }
1637 fd = openat(dir_fd, filename, (fix_elf ? O_RDWR : O_RDONLY) | O_CLOEXEC);
1638 if (fd == -1) {
1639 if (fix_elf && errno == ETXTBSY)
1640 warnp("%s: could not fix", filename);
1641 else if (be_verbose > 2)
1642 printf("%s: skipping file: %s\n", filename, strerror(errno));
1106 return; 1643 return 1;
1644 }
1107 1645
1108 if (scanelf_elf(filename, fd, st.st_size) == 1 && scan_archives) 1646 if (scanelf_elf(filename, fd, st->st_size) == 2) {
1109 /* if it isn't an ELF, maybe it's an .a archive */ 1647 /* if it isn't an ELF, maybe it's an .a archive */
1648 if (scan_archives)
1110 scanelf_archive(filename, fd, st.st_size); 1649 scanelf_archive(filename, fd, st->st_size);
1111 1650
1651 /*
1652 * unreadelf() implicitly closes its fd, so only close it
1653 * when we are returning it in the non-ELF case
1654 */
1112 close(fd); 1655 close(fd);
1656 }
1657
1658 return 0;
1113} 1659}
1114 1660
1115/* scan a directory for ET_EXEC files and print when we find one */ 1661/* scan a directory for ET_EXEC files and print when we find one */
1116static void scanelf_dir(const char *path) 1662static int scanelf_dirat(int dir_fd, const char *path)
1117{ 1663{
1118 register DIR *dir; 1664 register DIR *dir;
1119 register struct dirent *dentry; 1665 register struct dirent *dentry;
1120 struct stat st_top, st; 1666 struct stat st_top, st;
1121 char buf[__PAX_UTILS_PATH_MAX]; 1667 char buf[__PAX_UTILS_PATH_MAX], *subpath;
1122 size_t pathlen = 0, len = 0; 1668 size_t pathlen = 0, len = 0;
1669 int ret = 0;
1670 int subdir_fd;
1123 1671
1124 /* make sure path exists */ 1672 /* make sure path exists */
1125 if (lstat(path, &st_top) == -1) { 1673 if (fstatat(dir_fd, path, &st_top, AT_SYMLINK_NOFOLLOW) == -1) {
1126 if (be_verbose > 2) printf("%s: does not exist\n", path); 1674 if (be_verbose > 2) printf("%s: does not exist\n", path);
1127 return; 1675 return 1;
1128 } 1676 }
1129 1677
1130 /* ok, if it isn't a directory, assume we can open it */ 1678 /* ok, if it isn't a directory, assume we can open it */
1131 if (!S_ISDIR(st_top.st_mode)) { 1679 if (!S_ISDIR(st_top.st_mode))
1132 scanelf_file(path); 1680 return scanelf_fileat(dir_fd, path, &st_top);
1133 return;
1134 }
1135 1681
1136 /* now scan the dir looking for fun stuff */ 1682 /* now scan the dir looking for fun stuff */
1137 if ((dir = opendir(path)) == NULL) { 1683 subdir_fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
1138 warnf("could not opendir %s: %s", path, strerror(errno)); 1684 if (subdir_fd == -1)
1685 dir = NULL;
1686 else
1687 dir = fdopendir(subdir_fd);
1688 if (dir == NULL) {
1689 if (subdir_fd != -1)
1690 close(subdir_fd);
1691 warnfp("could not opendir(%s)", path);
1139 return; 1692 return 1;
1140 } 1693 }
1141 if (be_verbose > 1) printf("%s: scanning dir\n", path); 1694 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1142 1695
1143 pathlen = strlen(path); 1696 subpath = stpcpy(buf, path);
1697 if (subpath[-1] != '/')
1698 *subpath++ = '/';
1699 pathlen = subpath - buf;
1144 while ((dentry = readdir(dir))) { 1700 while ((dentry = readdir(dir))) {
1145 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1701 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1146 continue; 1702 continue;
1147 len = (pathlen + 1 + strlen(dentry->d_name) + 1); 1703
1148 if (len >= sizeof(buf)) { 1704 if (fstatat(subdir_fd, dentry->d_name, &st, AT_SYMLINK_NOFOLLOW) == -1)
1149 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1150 (unsigned long)len, (unsigned long)sizeof(buf));
1151 continue; 1705 continue;
1706
1707 len = strlen(dentry->d_name);
1708 if (len + pathlen + 1 >= sizeof(buf)) {
1709 warnf("Skipping '%s%s': len > sizeof(buf); %zu > %zu\n",
1710 path, dentry->d_name, len + pathlen + 1, sizeof(buf));
1711 continue;
1152 } 1712 }
1153 sprintf(buf, "%s/%s", path, dentry->d_name); 1713 memcpy(subpath, dentry->d_name, len);
1154 if (lstat(buf, &st) != -1) { 1714 subpath[len] = '\0';
1715
1155 if (S_ISREG(st.st_mode)) 1716 if (S_ISREG(st.st_mode))
1156 scanelf_file(buf); 1717 ret = scanelf_fileat(dir_fd, buf, &st);
1157 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1718 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1158 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1719 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1159 scanelf_dir(buf); 1720 ret = scanelf_dirat(dir_fd, buf);
1160 }
1161 } 1721 }
1162 } 1722 }
1163 closedir(dir); 1723 closedir(dir);
1164}
1165 1724
1725 return ret;
1726}
1727static int scanelf_dir(const char *path)
1728{
1729 return scanelf_dirat(root_fd, root_rel_path(path));
1730}
1731
1166static int scanelf_from_file(char *filename) 1732static int scanelf_from_file(const char *filename)
1167{ 1733{
1168 FILE *fp = NULL; 1734 FILE *fp;
1169 char *p; 1735 char *p, *path;
1170 char path[__PAX_UTILS_PATH_MAX]; 1736 size_t len;
1737 int ret;
1171 1738
1172 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL)) 1739 if (strcmp(filename, "-") == 0)
1173 fp = stdin; 1740 fp = stdin;
1174 else if ((fp = fopen(filename, "r")) == NULL) 1741 else if ((fp = fopen(filename, "r")) == NULL)
1175 return 1; 1742 return 1;
1176 1743
1177 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) { 1744 path = NULL;
1745 len = 0;
1746 ret = 0;
1747 while (getline(&path, &len, fp) != -1) {
1178 if ((p = strchr(path, '\n')) != NULL) 1748 if ((p = strchr(path, '\n')) != NULL)
1179 *p = 0; 1749 *p = 0;
1180 search_path = path; 1750 search_path = path;
1181 scanelf_dir(path); 1751 ret = scanelf_dir(path);
1182 } 1752 }
1753 free(path);
1754
1183 if (fp != stdin) 1755 if (fp != stdin)
1184 fclose(fp); 1756 fclose(fp);
1757
1185 return 0; 1758 return ret;
1186} 1759}
1187 1760
1188static void load_ld_so_conf() 1761#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1762
1763static int _load_ld_cache_config(const char *fname)
1189{ 1764{
1190 FILE *fp = NULL; 1765 FILE *fp = NULL;
1191 char *p; 1766 char *p, *path;
1192 char path[__PAX_UTILS_PATH_MAX]; 1767 size_t len;
1193 int i = 0; 1768 int curr_fd = -1;
1194 1769
1195 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1770 fp = fopenat_r(root_fd, root_rel_path(fname));
1771 if (fp == NULL)
1196 return; 1772 return -1;
1197 1773
1198 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) { 1774 path = NULL;
1199 if (*path != '/') 1775 len = 0;
1200 continue; 1776 while (getline(&path, &len, fp) != -1) {
1201
1202 if ((p = strrchr(path, '\r')) != NULL) 1777 if ((p = strrchr(path, '\r')) != NULL)
1203 *p = 0; 1778 *p = 0;
1204 if ((p = strchr(path, '\n')) != NULL) 1779 if ((p = strchr(path, '\n')) != NULL)
1205 *p = 0; 1780 *p = 0;
1206 1781
1207 ldpaths[i++] = xstrdup(path); 1782 /* recursive includes of the same file will make this segfault. */
1783 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1784 glob_t gl;
1785 size_t x;
1786 const char *gpath;
1208 1787
1209 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths)) 1788 /* re-use existing path buffer ... need to be creative */
1210 break; 1789 if (path[8] != '/')
1790 gpath = memcpy(path + 3, "/etc/", 5);
1791 else
1792 gpath = path + 8;
1793 if (root_fd != AT_FDCWD) {
1794 if (curr_fd == -1) {
1795 curr_fd = open(".", O_RDONLY|O_CLOEXEC);
1796 if (fchdir(root_fd))
1797 errp("unable to change to root dir");
1798 }
1799 gpath = root_rel_path(gpath);
1800 }
1801
1802 if (glob(gpath, 0, NULL, &gl) == 0) {
1803 for (x = 0; x < gl.gl_pathc; ++x) {
1804 /* try to avoid direct loops */
1805 if (strcmp(gl.gl_pathv[x], fname) == 0)
1806 continue;
1807 _load_ld_cache_config(gl.gl_pathv[x]);
1808 }
1809 globfree(&gl);
1810 }
1811
1812 /* failed globs are ignored by glibc */
1813 continue;
1211 } 1814 }
1212 ldpaths[i] = NULL; 1815
1816 if (*path != '/')
1817 continue;
1818
1819 xarraypush_str(ldpaths, path);
1820 }
1821 free(path);
1213 1822
1214 fclose(fp); 1823 fclose(fp);
1824
1825 if (curr_fd != -1) {
1826 if (fchdir(curr_fd))
1827 /* don't care */;
1828 close(curr_fd);
1829 }
1830
1831 return 0;
1832}
1833
1834#elif defined(__FreeBSD__) || defined(__DragonFly__)
1835
1836static int _load_ld_cache_config(const char *fname)
1837{
1838 FILE *fp = NULL;
1839 char *b = NULL, *p;
1840 struct elfhints_hdr hdr;
1841
1842 fp = fopenat_r(root_fd, root_rel_path(fname));
1843 if (fp == NULL)
1844 return -1;
1845
1846 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1847 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1848 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1849 {
1850 fclose(fp);
1851 return -1;
1852 }
1853
1854 b = xmalloc(hdr.dirlistlen + 1);
1855 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1856 fclose(fp);
1857 free(b);
1858 return -1;
1859 }
1860
1861 while ((p = strsep(&b, ":"))) {
1862 if (*p == '\0')
1863 continue;
1864 xarraypush_str(ldpaths, p);
1865 }
1866
1867 free(b);
1868 fclose(fp);
1869 return 0;
1870}
1871
1872#else
1873#ifdef __ELF__
1874#warning Cache config support not implemented for your target
1875#endif
1876static int _load_ld_cache_config(const char *fname)
1877{
1878 return 0;
1879}
1880#endif
1881
1882static void load_ld_cache_config(const char *fname)
1883{
1884 bool scan_l, scan_ul, scan_ull;
1885 size_t n;
1886 const char *ldpath;
1887
1888 _load_ld_cache_config(fname);
1889
1890 scan_l = scan_ul = scan_ull = false;
1891 if (array_cnt(ldpaths)) {
1892 array_for_each(ldpaths, n, ldpath) {
1893 if (!scan_l && !strcmp(ldpath, "/lib")) scan_l = true;
1894 if (!scan_ul && !strcmp(ldpath, "/usr/lib")) scan_ul = true;
1895 if (!scan_ull && !strcmp(ldpath, "/usr/local/lib")) scan_ull = true;
1896 }
1897 }
1898
1899 if (!scan_l) xarraypush_str(ldpaths, "/lib");
1900 if (!scan_ul) xarraypush_str(ldpaths, "/usr/lib");
1901 if (!scan_ull) xarraypush_str(ldpaths, "/usr/local/lib");
1215} 1902}
1216 1903
1217/* scan /etc/ld.so.conf for paths */ 1904/* scan /etc/ld.so.conf for paths */
1218static void scanelf_ldpath() 1905static void scanelf_ldpath(void)
1219{ 1906{
1220 char scan_l, scan_ul, scan_ull; 1907 size_t n;
1221 int i = 0; 1908 const char *ldpath;
1222 1909
1223 if (!ldpaths[0]) 1910 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]); 1911 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} 1912}
1240 1913
1241/* scan env PATH for paths */ 1914/* scan env PATH for paths */
1242static void scanelf_envpath() 1915static void scanelf_envpath(void)
1243{ 1916{
1244 char *path, *p; 1917 char *path, *p;
1245 1918
1246 path = getenv("PATH"); 1919 path = getenv("PATH");
1247 if (!path) 1920 if (!path)
1254 } 1927 }
1255 1928
1256 free(path); 1929 free(path);
1257} 1930}
1258 1931
1259 1932/* 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" 1933#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZCBhV"
1262#define a_argument required_argument 1934#define a_argument required_argument
1263static struct option const long_opts[] = { 1935static struct option const long_opts[] = {
1264 {"path", no_argument, NULL, 'p'}, 1936 {"path", no_argument, NULL, 'p'},
1265 {"ldpath", no_argument, NULL, 'l'}, 1937 {"ldpath", no_argument, NULL, 'l'},
1938 {"use-ldpath",no_argument, NULL, 129},
1939 {"root", a_argument, NULL, 128},
1266 {"recursive", no_argument, NULL, 'R'}, 1940 {"recursive", no_argument, NULL, 'R'},
1267 {"mount", no_argument, NULL, 'm'}, 1941 {"mount", no_argument, NULL, 'm'},
1268 {"symlink", no_argument, NULL, 'y'}, 1942 {"symlink", no_argument, NULL, 'y'},
1269 {"archives", no_argument, NULL, 'A'}, 1943 {"archives", no_argument, NULL, 'A'},
1270 {"ldcache", no_argument, NULL, 'L'}, 1944 {"ldcache", no_argument, NULL, 'L'},
1271 {"fix", no_argument, NULL, 'X'}, 1945 {"fix", no_argument, NULL, 'X'},
1946 {"setpax", a_argument, NULL, 'z'},
1272 {"pax", no_argument, NULL, 'x'}, 1947 {"pax", no_argument, NULL, 'x'},
1273 {"header", no_argument, NULL, 'e'}, 1948 {"header", no_argument, NULL, 'e'},
1274 {"textrel", no_argument, NULL, 't'}, 1949 {"textrel", no_argument, NULL, 't'},
1275 {"rpath", no_argument, NULL, 'r'}, 1950 {"rpath", no_argument, NULL, 'r'},
1276 {"needed", no_argument, NULL, 'n'}, 1951 {"needed", no_argument, NULL, 'n'},
1277 {"interp", no_argument, NULL, 'i'}, 1952 {"interp", no_argument, NULL, 'i'},
1278 {"bind", no_argument, NULL, 'b'}, 1953 {"bind", no_argument, NULL, 'b'},
1279 {"soname", no_argument, NULL, 'S'}, 1954 {"soname", no_argument, NULL, 'S'},
1280 {"symbol", a_argument, NULL, 's'}, 1955 {"symbol", a_argument, NULL, 's'},
1956 {"section", a_argument, NULL, 'k'},
1281 {"lib", a_argument, NULL, 'N'}, 1957 {"lib", a_argument, NULL, 'N'},
1282 {"gmatch", no_argument, NULL, 'g'}, 1958 {"gmatch", no_argument, NULL, 'g'},
1283 {"textrels", no_argument, NULL, 'T'}, 1959 {"textrels", no_argument, NULL, 'T'},
1284 {"etype", a_argument, NULL, 'E'}, 1960 {"etype", a_argument, NULL, 'E'},
1961 {"bits", a_argument, NULL, 'M'},
1962 {"endian", no_argument, NULL, 'D'},
1963 {"osabi", no_argument, NULL, 'I'},
1964 {"eabi", no_argument, NULL, 'Y'},
1965 {"perms", a_argument, NULL, 'O'},
1966 {"size", no_argument, NULL, 'Z'},
1285 {"all", no_argument, NULL, 'a'}, 1967 {"all", no_argument, NULL, 'a'},
1286 {"quiet", no_argument, NULL, 'q'}, 1968 {"quiet", no_argument, NULL, 'q'},
1287 {"verbose", no_argument, NULL, 'v'}, 1969 {"verbose", no_argument, NULL, 'v'},
1288 {"format", a_argument, NULL, 'F'}, 1970 {"format", a_argument, NULL, 'F'},
1289 {"from", a_argument, NULL, 'f'}, 1971 {"from", a_argument, NULL, 'f'},
1290 {"file", a_argument, NULL, 'o'}, 1972 {"file", a_argument, NULL, 'o'},
1973 {"nocolor", no_argument, NULL, 'C'},
1291 {"nobanner", no_argument, NULL, 'B'}, 1974 {"nobanner", no_argument, NULL, 'B'},
1292 {"help", no_argument, NULL, 'h'}, 1975 {"help", no_argument, NULL, 'h'},
1293 {"version", no_argument, NULL, 'V'}, 1976 {"version", no_argument, NULL, 'V'},
1294 {NULL, no_argument, NULL, 0x0} 1977 {NULL, no_argument, NULL, 0x0}
1295}; 1978};
1296 1979
1297static const char *opts_help[] = { 1980static const char * const opts_help[] = {
1298 "Scan all directories in PATH environment", 1981 "Scan all directories in PATH environment",
1299 "Scan all directories in /etc/ld.so.conf", 1982 "Scan all directories in /etc/ld.so.conf",
1983 "Use ld.so.conf to show full path (use with -r/-n)",
1984 "Root directory (use with -l or -p)",
1300 "Scan directories recursively", 1985 "Scan directories recursively",
1301 "Don't recursively cross mount points", 1986 "Don't recursively cross mount points",
1302 "Don't scan symlinks", 1987 "Don't scan symlinks",
1303 "Scan archives (.a files)", 1988 "Scan archives (.a files)",
1304 "Utilize ld.so.cache information (use with -r/-n)", 1989 "Utilize ld.so.cache to show full path (use with -r/-n)",
1305 "Try and 'fix' bad things (use with -r/-e)\n", 1990 "Try and 'fix' bad things (use with -r/-e)",
1991 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1306 "Print PaX markings", 1992 "Print PaX markings",
1307 "Print GNU_STACK/PT_LOAD markings", 1993 "Print GNU_STACK/PT_LOAD markings",
1308 "Print TEXTREL information", 1994 "Print TEXTREL information",
1309 "Print RPATH information", 1995 "Print RPATH information",
1310 "Print NEEDED information", 1996 "Print NEEDED information",
1311 "Print INTERP information", 1997 "Print INTERP information",
1312 "Print BIND information", 1998 "Print BIND information",
1313 "Print SONAME information", 1999 "Print SONAME information",
1314 "Find a specified symbol", 2000 "Find a specified symbol",
2001 "Find a specified section",
1315 "Find a specified library", 2002 "Find a specified library",
1316 "Use strncmp to match libraries. (use with -N)", 2003 "Use regex rather than string compare (with -s); specify twice for case insensitive",
1317 "Locate cause of TEXTREL", 2004 "Locate cause of TEXTREL",
2005 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1318 "Print only ELF files matching numeric constant", 2006 "Print only ELF files matching numeric bits",
1319 "Print all scanned info (-x -e -t -r -b)\n", 2007 "Print Endianness",
2008 "Print OSABI",
2009 "Print EABI (EM_ARM Only)",
2010 "Print only ELF files matching octal permissions",
2011 "Print ELF file size",
2012 "Print all useful/simple info\n",
1320 "Only output 'bad' things", 2013 "Only output 'bad' things",
1321 "Be verbose (can be specified more than once)", 2014 "Be verbose (can be specified more than once)",
1322 "Use specified format for output", 2015 "Use specified format for output",
1323 "Read input stream from a filename", 2016 "Read input stream from a filename",
1324 "Write output stream to a filename", 2017 "Write output stream to a filename",
2018 "Don't emit color in output",
1325 "Don't display the header", 2019 "Don't display the header",
1326 "Print this help and exit", 2020 "Print this help and exit",
1327 "Print version and exit", 2021 "Print version and exit",
1328 NULL 2022 NULL
1329}; 2023};
1333{ 2027{
1334 unsigned long i; 2028 unsigned long i;
1335 printf("* Scan ELF binaries for stuff\n\n" 2029 printf("* Scan ELF binaries for stuff\n\n"
1336 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0); 2030 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1337 printf("Options: -[%s]\n", PARSE_FLAGS); 2031 printf("Options: -[%s]\n", PARSE_FLAGS);
1338 for (i = 0; long_opts[i].name; ++i) 2032 for (i = 0; long_opts[i].name; ++i) {
2033 /* first output the short flag if it has one */
2034 if (long_opts[i].val > '~')
2035 printf(" ");
2036 else
2037 printf(" -%c, ", long_opts[i].val);
2038
2039 /* then the long flag */
1339 if (long_opts[i].has_arg == no_argument) 2040 if (long_opts[i].has_arg == no_argument)
1340 printf(" -%c, --%-13s* %s\n", long_opts[i].val, 2041 printf("--%-14s", long_opts[i].name);
1341 long_opts[i].name, opts_help[i]);
1342 else 2042 else
1343 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val, 2043 printf("--%-7s <arg> ", long_opts[i].name);
1344 long_opts[i].name, opts_help[i]);
1345 2044
1346 if (status != EXIT_SUCCESS) 2045 /* finally the help text */
1347 exit(status); 2046 printf("* %s\n", opts_help[i]);
2047 }
1348 2048
1349 puts("\nThe format modifiers for the -F option are:"); 2049 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); 2050 exit(status);
1360} 2051}
1361 2052
1362/* parse command line arguments and preform needed actions */ 2053/* parse command line arguments and preform needed actions */
2054#define do_pax_state(option, flag) \
2055 if (islower(option)) { \
2056 flags &= ~PF_##flag; \
2057 flags |= PF_NO##flag; \
2058 } else { \
2059 flags &= ~PF_NO##flag; \
2060 flags |= PF_##flag; \
2061 }
1363static void parseargs(int argc, char *argv[]) 2062static int parseargs(int argc, char *argv[])
1364{ 2063{
1365 int i; 2064 int i;
1366 char *from_file = NULL; 2065 const char *from_file = NULL;
2066 int ret = 0;
2067 char load_cache_config = 0;
1367 2068
1368 opterr = 0; 2069 opterr = 0;
1369 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 2070 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1370 switch (i) { 2071 switch (i) {
1371 2072
1379 case 'f': 2080 case 'f':
1380 if (from_file) warn("You prob don't want to specify -f twice"); 2081 if (from_file) warn("You prob don't want to specify -f twice");
1381 from_file = optarg; 2082 from_file = optarg;
1382 break; 2083 break;
1383 case 'E': 2084 case 'E':
1384 strncpy(match_etypes, optarg, sizeof(match_etypes)); 2085 match_etypes = optarg;
2086 break;
2087 case 'M':
2088 match_bits = atoi(optarg);
2089 if (match_bits == 0) {
2090 if (strcmp(optarg, "ELFCLASS32") == 0)
2091 match_bits = 32;
2092 if (strcmp(optarg, "ELFCLASS64") == 0)
2093 match_bits = 64;
2094 }
2095 break;
2096 case 'O':
2097 if (sscanf(optarg, "%o", &match_perms) == -1)
2098 match_bits = 0;
1385 break; 2099 break;
1386 case 'o': { 2100 case 'o': {
1387 FILE *fp = NULL;
1388 if ((fp = freopen(optarg, "w", stdout)) == NULL) 2101 if (freopen(optarg, "w", stdout) == NULL)
1389 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 2102 errp("Could not freopen(%s)", optarg);
1390 SET_STDOUT(fp);
1391 break; 2103 break;
1392 } 2104 }
1393 2105 case 'k':
2106 xarraypush_str(find_section_arr, optarg);
2107 break;
1394 case 's': { 2108 case 's': {
1395 if (find_sym) warn("You prob don't want to specify -s twice"); 2109 /* historically, this was comma delimited */
1396 find_sym = optarg; 2110 char *this_sym = strtok(optarg, ",");
1397 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1)); 2111 if (!this_sym) /* edge case: -s '' */
1398 sprintf(versioned_symname, "%s@", find_sym); 2112 xarraypush_str(find_sym_arr, "");
2113 while (this_sym) {
2114 xarraypush_str(find_sym_arr, this_sym);
2115 this_sym = strtok(NULL, ",");
2116 }
1399 break; 2117 break;
1400 } 2118 }
1401 case 'N': { 2119 case 'N':
1402 if (find_lib) warn("You prob don't want to specify -N twice"); 2120 xarraypush_str(find_lib_arr, optarg);
1403 find_lib = optarg;
1404 break; 2121 break;
1405 }
1406
1407 case 'F': { 2122 case 'F': {
1408 if (out_format) warn("You prob don't want to specify -F twice"); 2123 if (out_format) warn("You prob don't want to specify -F twice");
1409 out_format = optarg; 2124 out_format = optarg;
1410 break; 2125 break;
1411 } 2126 }
2127 case 'z': {
2128 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
2129 size_t x;
1412 2130
1413 case 'g': gmatch = 1; /* break; any reason we dont breal; here ? */ 2131 for (x = 0; x < strlen(optarg); x++) {
2132 switch (optarg[x]) {
2133 case 'p':
2134 case 'P':
2135 do_pax_state(optarg[x], PAGEEXEC);
2136 break;
2137 case 's':
2138 case 'S':
2139 do_pax_state(optarg[x], SEGMEXEC);
2140 break;
2141 case 'm':
2142 case 'M':
2143 do_pax_state(optarg[x], MPROTECT);
2144 break;
2145 case 'e':
2146 case 'E':
2147 do_pax_state(optarg[x], EMUTRAMP);
2148 break;
2149 case 'r':
2150 case 'R':
2151 do_pax_state(optarg[x], RANDMMAP);
2152 break;
2153 case 'x':
2154 case 'X':
2155 do_pax_state(optarg[x], RANDEXEC);
2156 break;
2157 default:
2158 break;
2159 }
2160 }
2161 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
2162 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
2163 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
2164 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
2165 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
2166 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
2167 setpax = flags;
2168 break;
2169 }
2170 case 'Z': show_size = 1; break;
2171 case 'g': ++g_match; break;
1414 case 'L': use_ldcache = 1; break; 2172 case 'L': load_cache_config = use_ldcache = 1; break;
1415 case 'y': scan_symlink = 0; break; 2173 case 'y': scan_symlink = 0; break;
1416 case 'A': scan_archives = 1; break; 2174 case 'A': scan_archives = 1; break;
2175 case 'C': color_init(true); break;
1417 case 'B': show_banner = 0; break; 2176 case 'B': show_banner = 0; break;
1418 case 'l': scan_ldpath = 1; break; 2177 case 'l': load_cache_config = scan_ldpath = 1; break;
1419 case 'p': scan_envpath = 1; break; 2178 case 'p': scan_envpath = 1; break;
1420 case 'R': dir_recurse = 1; break; 2179 case 'R': dir_recurse = 1; break;
1421 case 'm': dir_crossmount = 0; break; 2180 case 'm': dir_crossmount = 0; break;
1422 case 'X': ++fix_elf; break; 2181 case 'X': ++fix_elf; break;
1423 case 'x': show_pax = 1; break; 2182 case 'x': show_pax = 1; break;
1429 case 'b': show_bind = 1; break; 2188 case 'b': show_bind = 1; break;
1430 case 'S': show_soname = 1; break; 2189 case 'S': show_soname = 1; break;
1431 case 'T': show_textrels = 1; break; 2190 case 'T': show_textrels = 1; break;
1432 case 'q': be_quiet = 1; break; 2191 case 'q': be_quiet = 1; break;
1433 case 'v': be_verbose = (be_verbose % 20) + 1; break; 2192 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1434 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break; 2193 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
1435 2194 case 'D': show_endian = 1; break;
2195 case 'I': show_osabi = 1; break;
2196 case 'Y': show_eabi = 1; break;
2197 case 128:
2198 root_fd = open(optarg, O_RDONLY|O_CLOEXEC);
2199 if (root_fd == -1)
2200 err("Could not open root: %s", optarg);
2201 break;
2202 case 129: load_cache_config = use_ldpath = 1; break;
1436 case ':': 2203 case ':':
1437 err("Option '%c' is missing parameter", optopt); 2204 err("Option '%c' is missing parameter", optopt);
1438 case '?': 2205 case '?':
1439 err("Unknown option '%c' or argument missing", optopt); 2206 err("Unknown option '%c' or argument missing", optopt);
1440 default: 2207 default:
1441 err("Unhandled option '%c'; please report this", i); 2208 err("Unhandled option '%c'; please report this", i);
1442 } 2209 }
1443 } 2210 }
2211 if (show_textrels && be_verbose)
2212 has_objdump = bin_in_path("objdump");
2213 /* precompile all the regexes */
2214 if (g_match) {
2215 regex_t preg;
2216 const char *this_sym;
2217 size_t n;
2218 int flags = REG_EXTENDED | REG_NOSUB | (g_match > 1 ? REG_ICASE : 0);
1444 2219
2220 array_for_each(find_sym_arr, n, this_sym) {
2221 /* see scanelf_match_symname for logic info */
2222 switch (this_sym[0]) {
2223 case '%':
2224 while (*(this_sym++))
2225 if (*this_sym == '%') {
2226 ++this_sym;
2227 break;
2228 }
2229 break;
2230 case '+':
2231 case '-':
2232 ++this_sym;
2233 break;
2234 }
2235 if (*this_sym == '*')
2236 ++this_sym;
2237
2238 ret = regcomp(&preg, this_sym, flags);
2239 if (ret) {
2240 char err[256];
2241 regerror(ret, &preg, err, sizeof(err));
2242 err("regcomp of %s failed: %s", this_sym, err);
2243 }
2244 xarraypush(find_sym_regex_arr, &preg, sizeof(preg));
2245 }
2246 }
2247 /* flatten arrays for display */
2248 if (array_cnt(find_sym_arr))
2249 find_sym = array_flatten_str(find_sym_arr);
2250 if (array_cnt(find_lib_arr))
2251 find_lib = array_flatten_str(find_lib_arr);
2252 if (array_cnt(find_section_arr))
2253 find_section = array_flatten_str(find_section_arr);
1445 /* let the format option override all other options */ 2254 /* let the format option override all other options */
1446 if (out_format) { 2255 if (out_format) {
1447 show_pax = show_phdr = show_textrel = show_rpath = \ 2256 show_pax = show_phdr = show_textrel = show_rpath = \
1448 show_needed = show_interp = show_bind = show_soname = \ 2257 show_needed = show_interp = show_bind = show_soname = \
1449 show_textrels = 0; 2258 show_textrels = show_perms = show_endian = show_size = \
2259 show_osabi = show_eabi = 0;
1450 for (i = 0; out_format[i]; ++i) { 2260 for (i = 0; out_format[i]; ++i) {
1451 if (!IS_MODIFIER(out_format[i])) continue; 2261 if (!IS_MODIFIER(out_format[i])) continue;
1452 2262
1453 switch (out_format[++i]) { 2263 switch (out_format[++i]) {
2264 case '+': break;
1454 case '%': break; 2265 case '%': break;
1455 case '#': break; 2266 case '#': break;
1456 case 'F': break; 2267 case 'F': break;
1457 case 'p': break; 2268 case 'p': break;
1458 case 'f': break; 2269 case 'f': break;
2270 case 'k': break;
1459 case 's': break; 2271 case 's': break;
1460 case 'N': break; 2272 case 'N': break;
1461 case 'o': break; 2273 case 'o': break;
2274 case 'a': break;
2275 case 'M': break;
2276 case 'Z': show_size = 1; break;
2277 case 'D': show_endian = 1; break;
2278 case 'I': show_osabi = 1; break;
2279 case 'Y': show_eabi = 1; break;
2280 case 'O': show_perms = 1; break;
1462 case 'x': show_pax = 1; break; 2281 case 'x': show_pax = 1; break;
1463 case 'e': show_phdr = 1; break; 2282 case 'e': show_phdr = 1; break;
1464 case 't': show_textrel = 1; break; 2283 case 't': show_textrel = 1; break;
1465 case 'r': show_rpath = 1; break; 2284 case 'r': show_rpath = 1; break;
1466 case 'n': show_needed = 1; break; 2285 case 'n': show_needed = 1; break;
1467 case 'i': show_interp = 1; break; 2286 case 'i': show_interp = 1; break;
1468 case 'b': show_bind = 1; break; 2287 case 'b': show_bind = 1; break;
1469 case 'S': show_soname = 1; break; 2288 case 'S': show_soname = 1; break;
1470 case 'T': show_textrels = 1; break; 2289 case 'T': show_textrels = 1; break;
1471 default: 2290 default:
1472 err("Invalid format specifier '%c' (byte %i)", 2291 err("invalid format specifier '%c' (byte %i)",
1473 out_format[i], i+1); 2292 out_format[i], i+1);
1474 } 2293 }
1475 } 2294 }
1476 2295
1477 /* construct our default format */ 2296 /* construct our default format */
1478 } else { 2297 } else {
1479 size_t fmt_len = 30; 2298 size_t fmt_len = 30;
1480 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 2299 out_format = xmalloc(sizeof(char) * fmt_len);
2300 *out_format = '\0';
1481 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 2301 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1482 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len); 2302 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
2303 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
2304 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
2305 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
2306 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
2307 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
1483 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len); 2308 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1484 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 2309 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1485 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 2310 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1486 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 2311 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1487 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 2312 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1488 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len); 2313 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1489 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len); 2314 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1490 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len); 2315 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1491 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len); 2316 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
2317 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1492 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len); 2318 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1493 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 2319 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1494 } 2320 }
1495 if (be_verbose > 2) printf("Format: %s\n", out_format); 2321 if (be_verbose > 2) printf("Format: %s\n", out_format);
1496 2322
1497 /* now lets actually do the scanning */ 2323 /* now lets actually do the scanning */
1498 if (scan_ldpath || use_ldcache) 2324 if (load_cache_config)
1499 load_ld_so_conf(); 2325 load_ld_cache_config(__PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
1500 if (scan_ldpath) scanelf_ldpath(); 2326 if (scan_ldpath) scanelf_ldpath();
1501 if (scan_envpath) scanelf_envpath(); 2327 if (scan_envpath) scanelf_envpath();
2328 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
2329 from_file = "-";
1502 if (from_file) { 2330 if (from_file) {
1503 scanelf_from_file(from_file); 2331 scanelf_from_file(from_file);
1504 from_file = *argv; 2332 from_file = *argv;
1505 } 2333 }
1506 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file) 2334 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1507 err("Nothing to scan !?"); 2335 err("Nothing to scan !?");
1508 while (optind < argc) { 2336 while (optind < argc) {
1509 search_path = argv[optind++]; 2337 search_path = argv[optind++];
1510 scanelf_dir(search_path); 2338 ret = scanelf_dir(search_path);
1511 } 2339 }
1512 2340
2341#ifdef __PAX_UTILS_CLEANUP
1513 /* clean up */ 2342 /* clean up */
1514 if (versioned_symname) free(versioned_symname);
1515 for (i = 0; ldpaths[i]; ++i)
1516 free(ldpaths[i]); 2343 xarrayfree(ldpaths);
2344 xarrayfree(find_sym_arr);
2345 xarrayfree(find_lib_arr);
2346 xarrayfree(find_section_arr);
2347 free(find_sym);
2348 free(find_lib);
2349 free(find_section);
2350 {
2351 size_t n;
2352 regex_t *preg;
2353 array_for_each(find_sym_regex_arr, n, preg)
2354 regfree(preg);
2355 xarrayfree(find_sym_regex_arr);
2356 }
1517 2357
1518 if (ldcache != 0) 2358 if (ldcache != 0)
1519 munmap(ldcache, ldcache_size); 2359 munmap(ldcache, ldcache_size);
1520} 2360#endif
1521 2361
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; 2362 return ret;
1530} 2363}
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 2364
1541 new_len = strlen(*dst) + strlen(src); 2365static 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{ 2366{
1556 static char my_app[2]; 2367 const char *delims = " \t\n";
1557 my_app[0] = append; 2368 char **envvals = NULL;
1558 my_app[1] = '\0'; 2369 char *env, *s;
1559 xstrcat(dst, my_app, curr_len); 2370 int nentry;
1560}
1561 2371
2372 if ((env = getenv(envvar)) == NULL)
2373 return NULL;
1562 2374
2375 env = xstrdup(env);
2376 if (env == NULL)
2377 return NULL;
2378
2379 s = strtok(env, delims);
2380 if (s == NULL) {
2381 free(env);
2382 return NULL;
2383 }
2384
2385 nentry = 0;
2386 while (s != NULL) {
2387 ++nentry;
2388 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
2389 envvals[nentry-1] = s;
2390 s = strtok(NULL, delims);
2391 }
2392 envvals[nentry] = NULL;
2393
2394 /* don't want to free(env) as it contains the memory that backs
2395 * the envvals array of strings */
2396 return envvals;
2397}
2398
2399static void parseenv(void)
2400{
2401 color_init(false);
2402 qa_textrels = get_split_env("QA_TEXTRELS");
2403 qa_execstack = get_split_env("QA_EXECSTACK");
2404 qa_wx_load = get_split_env("QA_WX_LOAD");
2405}
2406
2407#ifdef __PAX_UTILS_CLEANUP
2408static void cleanup(void)
2409{
2410 free(out_format);
2411 free(qa_textrels);
2412 free(qa_execstack);
2413 free(qa_wx_load);
2414}
2415#endif
1563 2416
1564int main(int argc, char *argv[]) 2417int main(int argc, char *argv[])
1565{ 2418{
2419 int ret;
1566 if (argc < 2) 2420 if (argc < 2)
1567 usage(EXIT_FAILURE); 2421 usage(EXIT_FAILURE);
2422 parseenv();
1568 parseargs(argc, argv); 2423 ret = parseargs(argc, argv);
1569 fclose(stdout); 2424 fclose(stdout);
1570#ifdef __BOUNDS_CHECKING_ON 2425#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()"); 2426 cleanup();
2427 warn("The calls to add/delete heap should be off:\n"
2428 "\t- 1 due to the out_buffer not being freed in scanelf_fileat()\n"
2429 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
1572#endif 2430#endif
1573 return EXIT_SUCCESS; 2431 return ret;
1574} 2432}
2433
2434/* Match filename against entries in matchlist, return TRUE
2435 * if the file is listed */
2436static int file_matches_list(const char *filename, char **matchlist)
2437{
2438 char **file;
2439 char *match;
2440 char buf[__PAX_UTILS_PATH_MAX];
2441
2442 if (matchlist == NULL)
2443 return 0;
2444
2445 for (file = matchlist; *file != NULL; file++) {
2446 if (search_path) {
2447 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2448 match = buf;
2449 } else {
2450 match = *file;
2451 }
2452 if (fnmatch(match, filename, 0) == 0)
2453 return 1;
2454 }
2455 return 0;
2456}

Legend:
Removed from v.1.119  
changed lines
  Added in v.1.252

  ViewVC Help
Powered by ViewVC 1.1.20