/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.127 Revision 1.258
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 1.127 2006/02/17 07:13:54 solar Exp $ 4 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.258 2013/04/16 16:22:31 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 1.258 2013/04/16 16:22:31 vapier Exp $";
11const char argv0[] = "scanelf";
12
10#include "paxinc.h" 13#include "paxinc.h"
11 14
12static const char *rcsid = "$Id: scanelf.c,v 1.127 2006/02/17 07:13:54 solar Exp $";
13#define argv0 "scanelf"
14
15#define IS_MODIFIER(c) (c == '%' || c == '#') 15#define IS_MODIFIER(c) (c == '%' || c == '#' || c == '+')
16
17
18 16
19/* prototypes */ 17/* prototypes */
20static int scanelf_elfobj(elfobj *elf); 18static int file_matches_list(const char *filename, char **matchlist);
21static int scanelf_elf(const char *filename, int fd, size_t len);
22static int scanelf_archive(const char *filename, int fd, size_t len);
23static void scanelf_file(const char *filename);
24static void scanelf_dir(const char *path);
25static void scanelf_ldpath(void);
26static void scanelf_envpath(void);
27static void usage(int status);
28static void parseargs(int argc, char *argv[]);
29static char *xstrdup(const char *s);
30static void *xmalloc(size_t size);
31static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n);
32#define xstrcat(dst,src,curr_len) xstrncat(dst,src,curr_len,0)
33static inline void xchrcat(char **dst, const char append, size_t *curr_len);
34 19
35/* variables to control behavior */ 20/* variables to control behavior */
36static char match_etypes[126] = ""; 21static char *match_etypes = NULL;
37static char *ldpaths[256]; 22static array_t _ldpaths = array_init_decl, *ldpaths = &_ldpaths;
38static char scan_ldpath = 0; 23static char scan_ldpath = 0;
39static char scan_envpath = 0; 24static char scan_envpath = 0;
40static char scan_symlink = 1; 25static char scan_symlink = 1;
41static char scan_archives = 0; 26static char scan_archives = 0;
42static char dir_recurse = 0; 27static char dir_recurse = 0;
43static char dir_crossmount = 1; 28static char dir_crossmount = 1;
44static char show_pax = 0; 29static char show_pax = 0;
30static char show_perms = 0;
31static char show_size = 0;
45static char show_phdr = 0; 32static char show_phdr = 0;
46static char show_textrel = 0; 33static char show_textrel = 0;
47static char show_rpath = 0; 34static char show_rpath = 0;
48static char show_needed = 0; 35static char show_needed = 0;
49static char show_interp = 0; 36static char show_interp = 0;
50static char show_bind = 0; 37static char show_bind = 0;
51static char show_soname = 0; 38static char show_soname = 0;
52static char show_textrels = 0; 39static char show_textrels = 0;
53static char show_banner = 1; 40static char show_banner = 1;
41static char show_endian = 0;
42static char show_osabi = 0;
43static char show_eabi = 0;
54static char be_quiet = 0; 44static char be_quiet = 0;
55static char be_verbose = 0; 45static char be_verbose = 0;
56static char be_wewy_wewy_quiet = 0; 46static char be_wewy_wewy_quiet = 0;
57static char *find_sym = NULL, *versioned_symname = NULL; 47static char be_semi_verbose = 0;
48static char *find_sym = NULL;
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;
59static char *find_section = NULL; 53static char *find_section = NULL;
54static array_t _find_section_arr = array_init_decl, *find_section_arr = &_find_section_arr;
60static char *out_format = NULL; 55static char *out_format = NULL;
61static char *search_path = NULL; 56static char *search_path = NULL;
62static char fix_elf = 0; 57static char fix_elf = 0;
63static char gmatch = 0; 58static char g_match = 0;
64static char use_ldcache = 0; 59static char use_ldcache = 0;
60static char use_ldpath = 0;
65 61
62static char **qa_textrels = NULL;
63static char **qa_execstack = NULL;
64static char **qa_wx_load = NULL;
65static int root_fd = AT_FDCWD;
66
66int match_bits = 0; 67static int match_bits = 0;
67caddr_t ldcache = 0; 68static unsigned int match_perms = 0;
69static void *ldcache = NULL;
68size_t ldcache_size = 0; 70static size_t ldcache_size = 0;
69unsigned long setpax = 0UL; 71static unsigned long setpax = 0UL;
70 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
71/* sub-funcs for scanelf_file() */ 123/* sub-funcs for scanelf_fileat() */
72static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab) 124static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **str)
73{ 125{
74 /* 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 */
75#define GET_SYMTABS(B) \ 141#define GET_SYMTABS(B) \
76 if (elf->elf_class == ELFCLASS ## B) { \ 142 if (elf->elf_class == ELFCLASS ## B) { \
77 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \ 143 Elf ## B ## _Shdr *esymtab = symtab; \
78 /* debug sections */ \ 144 Elf ## B ## _Shdr *estrtab = strtab; \
79 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \ 145 Elf ## B ## _Shdr *edynsym = dynsym; \
80 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \ 146 Elf ## B ## _Shdr *edynstr = dynstr; \
81 /* runtime sections */ \ 147 \
82 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \ 148 if (symtab && EGET(esymtab->sh_type) == SHT_NOBITS) \
83 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \ 149 symtab = NULL; \
150 if (dynsym && EGET(edynsym->sh_type) == SHT_NOBITS) \
151 dynsym = NULL; \
84 if (symtab && dynsym) { \ 152 if (symtab && dynsym) \
85 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \ 153 *sym = (EGET(esymtab->sh_size) > EGET(edynsym->sh_size)) ? symtab : dynsym; \
86 } else { \ 154 else \
87 *sym = (void*)(symtab ? symtab : dynsym); \ 155 *sym = symtab ? symtab : dynsym; \
88 } \ 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; \
89 if (strtab && dynstr) { \ 161 if (strtab && dynstr) \
90 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \ 162 *str = (EGET(estrtab->sh_size) > EGET(edynstr->sh_size)) ? strtab : dynstr; \
91 } else { \ 163 else \
92 *tab = (void*)(strtab ? strtab : dynstr); \ 164 *str = strtab ? strtab : dynstr; \
93 } \
94 } 165 }
95 GET_SYMTABS(32) 166 GET_SYMTABS(32)
96 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)
97} 259}
98 260
99static char *scanelf_file_pax(elfobj *elf, char *found_pax) 261static char *scanelf_file_pax(elfobj *elf, char *found_pax)
100{ 262{
101 static char ret[7]; 263 static char ret[7];
116 continue; \ 278 continue; \
117 if (fix_elf && setpax) { \ 279 if (fix_elf && setpax) { \
118 /* set the paxctl flags */ \ 280 /* set the paxctl flags */ \
119 ESET(phdr[i].p_flags, setpax); \ 281 ESET(phdr[i].p_flags, setpax); \
120 } \ 282 } \
121 if (be_quiet && (EGET(phdr[i].p_flags) == 10240)) \ 283 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
122 continue; \ 284 continue; \
123 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); \
124 *found_pax = 1; \ 286 *found_pax = 1; \
125 ++shown; \ 287 ++shown; \
126 break; \ 288 break; \
128 } 290 }
129 SHOW_PAX(32) 291 SHOW_PAX(32)
130 SHOW_PAX(64) 292 SHOW_PAX(64)
131 } 293 }
132 294
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 */
301
133 /* fall back to EI_PAX if no PT_PAX was found */ 302 /* fall back to EI_PAX if no PT_PAX was found */
134 if (!*ret) { 303 if (!*ret) {
135 static char *paxflags; 304 static char *paxflags;
136
137 if (fix_elf && setpax) {
138 /* set the chpax settings */
139 // ESET(EHDR ## B (elf->ehdr)->e_ident[EI_PAX]), setpax);
140 }
141
142 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf)); 305 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
143 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) { 306 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
144 *found_pax = 1; 307 *found_pax = 1;
145 return (be_wewy_wewy_quiet ? NULL : paxflags); 308 return (be_wewy_wewy_quiet ? NULL : paxflags);
146 } 309 }
156static 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)
157{ 320{
158 static char ret[12]; 321 static char ret[12];
159 char *found; 322 char *found;
160 unsigned long i, shown, multi_stack, multi_relro, multi_load; 323 unsigned long i, shown, multi_stack, multi_relro, multi_load;
161 int max_pt_load;
162 324
163 if (!show_phdr) return NULL; 325 if (!show_phdr) return NULL;
164 326
165 memcpy(ret, "--- --- ---\0", 12); 327 memcpy(ret, "--- --- ---\0", 12);
166 328
167 shown = 0; 329 shown = 0;
168 multi_stack = multi_relro = multi_load = 0; 330 multi_stack = multi_relro = multi_load = 0;
169 max_pt_load = elf_max_pt_load(elf);
170 331
171#define NOTE_GNU_STACK ".note.GNU-stack" 332#define NOTE_GNU_STACK ".note.GNU-stack"
172#define SHOW_PHDR(B) \ 333#define SHOW_PHDR(B) \
173 if (elf->elf_class == ELFCLASS ## B) { \ 334 if (elf->elf_class == ELFCLASS ## B) { \
174 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 335 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
176 uint32_t flags, check_flags; \ 337 uint32_t flags, check_flags; \
177 if (elf->phdr != NULL) { \ 338 if (elf->phdr != NULL) { \
178 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 339 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
179 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \ 340 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
180 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \ 341 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
342 if (multi_stack++) \
181 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; \
182 found = found_phdr; \ 346 found = found_phdr; \
183 offset = 0; \ 347 offset = 0; \
184 check_flags = PF_X; \ 348 check_flags = PF_X; \
185 } 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++) \
186 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \ 351 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
187 found = found_relro; \ 352 found = found_relro; \
188 offset = 4; \ 353 offset = 4; \
189 check_flags = PF_X; \ 354 check_flags = PF_X; \
190 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \ 355 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
191 if (ehdr->e_type == ET_DYN || ehdr->e_type == ET_EXEC) \ 356 if (file_matches_list(elf->filename, qa_wx_load)) \
192 if (multi_load++ > max_pt_load) warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \ 357 continue; \
193 found = found_load; \ 358 found = found_load; \
194 offset = 8; \ 359 offset = 8; \
195 check_flags = PF_W|PF_X; \ 360 check_flags = PF_W|PF_X; \
196 } else \ 361 } else \
197 continue; \ 362 continue; \
198 flags = EGET(phdr[i].p_flags); \ 363 flags = EGET(phdr[i].p_flags); \
199 if (be_quiet && ((flags & check_flags) != check_flags)) \ 364 if (be_quiet && ((flags & check_flags) != check_flags)) \
200 continue; \ 365 continue; \
201 if (fix_elf && ((flags & PF_X) != flags)) { \ 366 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
202 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \ 367 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
203 ret[3] = ret[7] = '!'; \ 368 ret[3] = ret[7] = '!'; \
204 flags = EGET(phdr[i].p_flags); \ 369 flags = EGET(phdr[i].p_flags); \
205 } \ 370 } \
206 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \ 371 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
210 } else if (elf->shdr != NULL) { \ 375 } else if (elf->shdr != NULL) { \
211 /* no program headers which means this is prob an object file */ \ 376 /* no program headers which means this is prob an object file */ \
212 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \ 377 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
213 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \ 378 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
214 char *str; \ 379 char *str; \
215 if ((void*)strtbl > (void*)elf->data_end) \ 380 if ((void*)strtbl > elf->data_end) \
216 goto skip_this_shdr##B; \ 381 goto skip_this_shdr##B; \
217 check_flags = SHF_WRITE|SHF_EXECINSTR; \ 382 check_flags = SHF_WRITE|SHF_EXECINSTR; \
218 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \ 383 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
219 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \ 384 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
220 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \ 385 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
234 break; \ 399 break; \
235 } \ 400 } \
236 } \ 401 } \
237 skip_this_shdr##B: \ 402 skip_this_shdr##B: \
238 if (!multi_stack) { \ 403 if (!multi_stack) { \
404 if (file_matches_list(elf->filename, qa_execstack)) \
405 return NULL; \
239 *found_phdr = 1; \ 406 *found_phdr = 1; \
240 shown = 1; \ 407 shown = 1; \
241 memcpy(ret, "!WX", 3); \ 408 memcpy(ret, "!WX", 3); \
242 } \ 409 } \
243 } \ 410 } \
248 if (be_wewy_wewy_quiet || (be_quiet && !shown)) 415 if (be_wewy_wewy_quiet || (be_quiet && !shown))
249 return NULL; 416 return NULL;
250 else 417 else
251 return ret; 418 return ret;
252} 419}
420
421/*
422 * See if this ELF contains a DT_TEXTREL tag in any of its
423 * PT_DYNAMIC sections.
424 */
253static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 425static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
254{ 426{
255 static const char *ret = "TEXTREL"; 427 static const char *ret = "TEXTREL";
256 unsigned long i; 428 unsigned long i;
257 429
258 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;
259 433
260 if (elf->phdr) { 434 if (elf->phdr) {
261#define SHOW_TEXTREL(B) \ 435#define SHOW_TEXTREL(B) \
262 if (elf->elf_class == ELFCLASS ## B) { \ 436 if (elf->elf_class == ELFCLASS ## B) { \
263 Elf ## B ## _Dyn *dyn; \ 437 Elf ## B ## _Dyn *dyn; \
264 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 438 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
265 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 439 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
266 Elf ## B ## _Off offset; \ 440 Elf ## B ## _Off offset; \
267 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 441 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
268 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; \
269 offset = EGET(phdr[i].p_offset); \ 443 offset = EGET(phdr[i].p_offset); \
270 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 444 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
271 dyn = DYN ## B (elf->data + offset); \ 445 dyn = DYN ## B (elf->vdata + offset); \
272 while (EGET(dyn->d_tag) != DT_NULL) { \ 446 while (EGET(dyn->d_tag) != DT_NULL) { \
273 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)*/ \
274 *found_textrel = 1; \ 448 *found_textrel = 1; \
275 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \ 449 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
276 return (be_wewy_wewy_quiet ? NULL : ret); \ 450 return (be_wewy_wewy_quiet ? NULL : ret); \
285 if (be_quiet || be_wewy_wewy_quiet) 459 if (be_quiet || be_wewy_wewy_quiet)
286 return NULL; 460 return NULL;
287 else 461 else
288 return " - "; 462 return " - ";
289} 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 */
290static 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)
291{ 471{
292 unsigned long s, r, rmax; 472 unsigned long s, r, rmax;
293 void *symtab_void, *strtab_void, *text_void; 473 void *symtab_void, *strtab_void, *text_void;
294 474
315 Elf ## B ## _Rela *rela; \ 495 Elf ## B ## _Rela *rela; \
316 /* search the section headers for relocations */ \ 496 /* search the section headers for relocations */ \
317 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \ 497 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
318 uint32_t sh_type = EGET(shdr[s].sh_type); \ 498 uint32_t sh_type = EGET(shdr[s].sh_type); \
319 if (sh_type == SHT_REL) { \ 499 if (sh_type == SHT_REL) { \
320 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \ 500 rel = REL ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
321 rela = NULL; \ 501 rela = NULL; \
322 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \ 502 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
323 } else if (sh_type == SHT_RELA) { \ 503 } else if (sh_type == SHT_RELA) { \
324 rel = NULL; \ 504 rel = NULL; \
325 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \ 505 rela = RELA ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
326 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \ 506 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
327 } else \ 507 } else \
328 continue; \ 508 continue; \
329 /* now see if any of the relocs are in the .text */ \ 509 /* now see if any of the relocs are in the .text */ \
330 for (r = 0; r < rmax; ++r) { \ 510 for (r = 0; r < rmax; ++r) { \
345 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \ 525 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
346 if (be_verbose <= 2) continue; \ 526 if (be_verbose <= 2) continue; \
347 } else \ 527 } else \
348 *found_textrels = 1; \ 528 *found_textrels = 1; \
349 /* locate this relocation symbol name */ \ 529 /* locate this relocation symbol name */ \
350 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 530 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
351 if ((void*)sym > (void*)elf->data_end) { \ 531 if ((void*)sym > elf->data_end) { \
352 warn("%s: corrupt ELF symbol", elf->filename); \ 532 warn("%s: corrupt ELF symbol", elf->filename); \
353 continue; \ 533 continue; \
354 } \ 534 } \
355 sym_max = ELF ## B ## _R_SYM(r_info); \ 535 sym_max = ELF ## B ## _R_SYM(r_info); \
356 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \ 536 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
359 sym = NULL; \ 539 sym = NULL; \
360 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 540 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
361 /* show the raw details about this reloc */ \ 541 /* show the raw details about this reloc */ \
362 printf(" %s: ", elf->base_filename); \ 542 printf(" %s: ", elf->base_filename); \
363 if (sym && sym->st_name) \ 543 if (sym && sym->st_name) \
364 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)); \
365 else \ 545 else \
366 printf("(memory/fake?)"); \ 546 printf("(memory/data?)"); \
367 printf(" [0x%lX]", (unsigned long)r_offset); \ 547 printf(" [0x%lX]", (unsigned long)r_offset); \
368 /* 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 */ \
369 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 549 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
370 func = NULL; \ 550 func = NULL; \
371 offset_tmp = 0; \ 551 offset_tmp = 0; \
372 while (sym_max--) { \ 552 while (sym_max--) { \
373 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) { \
374 func = sym; \ 554 func = sym; \
375 offset_tmp = EGET(sym->st_value); \ 555 offset_tmp = EGET(sym->st_value); \
376 } \ 556 } \
377 ++sym; \ 557 ++sym; \
378 } \ 558 } \
379 printf(" in "); \ 559 printf(" in "); \
380 if (func && func->st_name) \ 560 if (func && func->st_name) { \
381 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); \
382 else \ 564 else \
383 printf("(NULL: fake?)"); \ 565 printf("%s", func_name); \
566 } else \
567 printf("(optimized out)"); \
384 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 } \
385 } \ 589 } \
386 } } 590 } }
387 SHOW_TEXTRELS(32) 591 SHOW_TEXTRELS(32)
388 SHOW_TEXTRELS(64) 592 SHOW_TEXTRELS(64)
389 } 593 }
391 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);
392 596
393 return NULL; 597 return NULL;
394} 598}
395 599
396static void rpath_security_checks(elfobj *, char *, const char *);
397static 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)
398{ 601{
399 struct stat st; 602 struct stat st;
400 switch (*item) { 603 switch (*item) {
401 case '/': break; 604 case '/': break;
407 warnf("Security problem NULL %s in %s", dt_type, elf->filename); 610 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
408 break; 611 break;
409 case '$': 612 case '$':
410 if (fstat(elf->fd, &st) != -1) 613 if (fstat(elf->fd, &st) != -1)
411 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID)) 614 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
412 warnf("Security problem with %s='%s' in %s with mode set of %o", 615 warnf("Security problem with %s='%s' in %s with mode set of %o",
413 dt_type, item, elf->filename, st.st_mode & 07777); 616 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
414 break; 617 break;
415 default: 618 default:
416 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);
417 break; 620 break;
418 } 621 }
419} 622}
420static 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)
421{ 624{
422 unsigned long i, s; 625 unsigned long i;
423 char *rpath, *runpath, **r; 626 char *rpath, *runpath, **r;
424 void *strtbl_void; 627 void *strtbl_void;
425 628
426 if (!show_rpath) return; 629 if (!show_rpath) return;
427 630
438 Elf ## B ## _Off offset; \ 641 Elf ## B ## _Off offset; \
439 Elf ## B ## _Xword word; \ 642 Elf ## B ## _Xword word; \
440 /* Scan all the program headers */ \ 643 /* Scan all the program headers */ \
441 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 644 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
442 /* Just scan dynamic headers */ \ 645 /* Just scan dynamic headers */ \
443 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; \
444 offset = EGET(phdr[i].p_offset); \ 647 offset = EGET(phdr[i].p_offset); \
445 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 648 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
446 /* Just scan dynamic RPATH/RUNPATH headers */ \ 649 /* Just scan dynamic RPATH/RUNPATH headers */ \
447 dyn = DYN ## B (elf->data + offset); \ 650 dyn = DYN ## B (elf->vdata + offset); \
448 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \ 651 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
449 if (word == DT_RPATH) { \ 652 if (word == DT_RPATH) { \
450 r = &rpath; \ 653 r = &rpath; \
451 } else if (word == DT_RUNPATH) { \ 654 } else if (word == DT_RUNPATH) { \
452 r = &runpath; \ 655 r = &runpath; \
456 } \ 659 } \
457 /* Verify the memory is somewhat sane */ \ 660 /* Verify the memory is somewhat sane */ \
458 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 661 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
459 if (offset < (Elf ## B ## _Off)elf->len) { \ 662 if (offset < (Elf ## B ## _Off)elf->len) { \
460 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \ 663 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
461 *r = (char*)(elf->data + offset); \ 664 *r = elf->data + offset; \
462 /* 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 */ \
463 if (fix_elf) \ 666 if (fix_elf) \
464 offset = strlen(*r); \ 667 offset = strlen(*r); \
465 /* If quiet, don't output paths in ld.so.conf */ \ 668 /* If quiet, don't output paths in ld.so.conf */ \
466 if (be_quiet) { \ 669 if (be_quiet) { \
472 /* scan each path in : delimited list */ \ 675 /* scan each path in : delimited list */ \
473 while (start) { \ 676 while (start) { \
474 rpath_security_checks(elf, start, get_elfdtype(word)); \ 677 rpath_security_checks(elf, start, get_elfdtype(word)); \
475 end = strchr(start, ':'); \ 678 end = strchr(start, ':'); \
476 len = (end ? abs(end - start) : strlen(start)); \ 679 len = (end ? abs(end - start) : strlen(start)); \
477 if (use_ldcache) \ 680 if (use_ldcache) { \
478 for (s = 0; ldpaths[s]; ++s) \ 681 size_t n; \
682 const char *ldpath; \
683 array_for_each(ldpaths, n, ldpath) \
479 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \ 684 if (!strncmp(ldpath, start, len) && !ldpath[len]) { \
480 *r = end; \ 685 *r = end; \
481 /* corner case ... if RPATH reads "/usr/lib:", we want \ 686 /* corner case ... if RPATH reads "/usr/lib:", we want \
482 * to show ':' rather than '' */ \ 687 * to show ':' rather than '' */ \
483 if (end && end[1] != '\0') \ 688 if (end && end[1] != '\0') \
484 (*r)++; \ 689 (*r)++; \
485 break; \ 690 break; \
486 } \ 691 } \
692 } \
487 if (!*r || !end) \ 693 if (!*r || !end) \
488 break; \ 694 break; \
489 else \ 695 else \
490 start = start + len + 1; \ 696 start = start + len + 1; \
491 } \ 697 } \
557 xstrcat(ret, (runpath ? runpath : rpath), ret_len); 763 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
558 else if (!be_quiet) 764 else if (!be_quiet)
559 xstrcat(ret, " - ", ret_len); 765 xstrcat(ret, " - ", ret_len);
560} 766}
561 767
768/* Defines can be seen in glibc's sysdeps/generic/ldconfig.h */
562#define LDSO_CACHE_MAGIC "ld.so-" 769#define LDSO_CACHE_MAGIC "ld.so-"
563#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1) 770#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
564#define LDSO_CACHE_VER "1.7.0" 771#define LDSO_CACHE_VER "1.7.0"
565#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1) 772#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
566#define FLAG_ANY -1 773#define FLAG_ANY -1
575#define FLAG_X8664_LIB64 0x0300 782#define FLAG_X8664_LIB64 0x0300
576#define FLAG_S390_LIB64 0x0400 783#define FLAG_S390_LIB64 0x0400
577#define FLAG_POWERPC_LIB64 0x0500 784#define FLAG_POWERPC_LIB64 0x0500
578#define FLAG_MIPS64_LIBN32 0x0600 785#define FLAG_MIPS64_LIBN32 0x0600
579#define FLAG_MIPS64_LIBN64 0x0700 786#define FLAG_MIPS64_LIBN64 0x0700
787#define FLAG_X8664_LIBX32 0x0800
788#define FLAG_ARM_LIBHF 0x0900
789#define FLAG_AARCH64_LIB64 0x0a00
580 790
581static char *lookup_cache_lib(elfobj *, char *); 791#if defined(__GLIBC__) || defined(__UCLIBC__)
792
582static char *lookup_cache_lib(elfobj *elf, char *fname) 793static char *lookup_cache_lib(elfobj *elf, const char *fname)
583{ 794{
584 int fd = 0; 795 int fd;
585 char *strs; 796 char *strs;
586 static char buf[__PAX_UTILS_PATH_MAX] = ""; 797 static char buf[__PAX_UTILS_PATH_MAX] = "";
587 const char *cachefile = "/etc/ld.so.cache"; 798 const char *cachefile = root_rel_path("/etc/ld.so.cache");
588 struct stat st; 799 struct stat st;
589 800
590 typedef struct { 801 typedef struct {
591 char magic[LDSO_CACHE_MAGIC_LEN]; 802 char magic[LDSO_CACHE_MAGIC_LEN];
592 char version[LDSO_CACHE_VER_LEN]; 803 char version[LDSO_CACHE_VER_LEN];
602 libentry_t *libent; 813 libentry_t *libent;
603 814
604 if (fname == NULL) 815 if (fname == NULL)
605 return NULL; 816 return NULL;
606 817
607 if (ldcache == 0) { 818 if (ldcache == NULL) {
608 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1) 819 if (fstatat(root_fd, cachefile, &st, 0))
820 return NULL;
821
822 fd = openat(root_fd, cachefile, O_RDONLY);
823 if (fd == -1)
609 return NULL; 824 return NULL;
610 825
611 /* cache these values so we only map/unmap the cache file once */ 826 /* cache these values so we only map/unmap the cache file once */
612 ldcache_size = st.st_size; 827 ldcache_size = st.st_size;
613 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0); 828 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
614
615 close(fd); 829 close(fd);
616 830
617 if (ldcache == (caddr_t)-1) { 831 if (ldcache == MAP_FAILED) {
618 ldcache = 0; 832 ldcache = NULL;
619 return NULL; 833 return NULL;
620 } 834 }
621 835
622 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN)) 836 if (memcmp(header->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN) ||
837 memcmp(header->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
838 {
839 munmap(ldcache, ldcache_size);
840 ldcache = NULL;
623 return NULL; 841 return NULL;
624 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
625 return NULL;
626 } 842 }
843 } else
844 header = ldcache;
627 845
628 header = (header_t *) ldcache;
629 libent = (libentry_t *) (ldcache + sizeof(header_t)); 846 libent = ldcache + sizeof(header_t);
630 strs = (char *) &libent[header->nlibs]; 847 strs = (char *) &libent[header->nlibs];
631 848
632 for (fd = 0; fd < header->nlibs; fd++) { 849 for (fd = 0; fd < header->nlibs; ++fd) {
633 /* this should be more fine grained, but for now we assume that 850 /* This should be more fine grained, but for now we assume that
634 * diff arches will not be cached together. and we ignore the 851 * diff arches will not be cached together, and we ignore the
635 * the different multilib mips cases. */ 852 * the different multilib mips cases.
853 */
636 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK)) 854 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
637 continue; 855 continue;
638 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK)) 856 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
639 continue; 857 continue;
640 858
641 if (strcmp(fname, strs + libent[fd].sooffset) != 0) 859 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
642 continue; 860 continue;
861
862 /* Return first hit because that is how the ldso rolls */
643 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf)); 863 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
864 break;
644 } 865 }
866
645 return buf; 867 return buf;
646} 868}
647 869
870#elif defined(__NetBSD__)
871static char *lookup_cache_lib(elfobj *elf, const char *fname)
872{
873 static char buf[__PAX_UTILS_PATH_MAX] = "";
874 static struct stat st;
875 size_t n;
876 char *ldpath;
877
878 array_for_each(ldpath, n, ldpath) {
879 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", ldpath, fname) >= sizeof(buf))
880 continue; /* if the pathname is too long, or something went wrong, ignore */
881
882 if (stat(buf, &st) != 0)
883 continue; /* if the lib doesn't exist in *ldpath, look further */
884
885 /* NetBSD doesn't actually do sanity checks, it just loads the file
886 * and if that doesn't work, continues looking in other directories.
887 * This cannot easily be safely emulated, unfortunately. For now,
888 * just assume that if it exists, it's a valid library. */
889
890 return buf;
891 }
892
893 /* not found in any path */
894 return NULL;
895}
896#else
897#ifdef __ELF__
898#warning Cache support not implemented for your target
899#endif
900static char *lookup_cache_lib(elfobj *elf, const char *fname)
901{
902 return NULL;
903}
904#endif
905
906static char *lookup_config_lib(const char *fname)
907{
908 static char buf[__PAX_UTILS_PATH_MAX] = "";
909 const char *ldpath;
910 size_t n;
911
912 array_for_each(ldpaths, n, ldpath) {
913 snprintf(buf, sizeof(buf), "%s/%s", root_rel_path(ldpath), fname);
914 if (faccessat(root_fd, buf, F_OK, AT_SYMLINK_NOFOLLOW) == 0)
915 return buf;
916 }
917
918 return NULL;
919}
648 920
649static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len) 921static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
650{ 922{
651 unsigned long i; 923 unsigned long i;
652 char *needed; 924 char *needed;
653 void *strtbl_void; 925 void *strtbl_void;
654 char *p; 926 char *p;
655 927
928 /*
929 * -n -> op==0 -> print all
930 * -N -> op==1 -> print requested
931 */
656 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL; 932 if ((op == 0 && !show_needed) || (op == 1 && !find_lib))
933 return NULL;
657 934
658 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 935 strtbl_void = elf_findsecbyname(elf, ".dynstr");
659 936
660 if (elf->phdr && strtbl_void) { 937 if (elf->phdr && strtbl_void) {
661#define SHOW_NEEDED(B) \ 938#define SHOW_NEEDED(B) \
663 Elf ## B ## _Dyn *dyn; \ 940 Elf ## B ## _Dyn *dyn; \
664 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 941 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
665 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 942 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
666 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 943 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
667 Elf ## B ## _Off offset; \ 944 Elf ## B ## _Off offset; \
945 size_t matched = 0; \
946 /* Walk all the program headers to find the PT_DYNAMIC */ \
668 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 947 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
669 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 948 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) \
949 continue; \
670 offset = EGET(phdr[i].p_offset); \ 950 offset = EGET(phdr[i].p_offset); \
671 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 951 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
952 continue; \
953 /* Walk all the dynamic tags to find NEEDED entries */ \
672 dyn = DYN ## B (elf->data + offset); \ 954 dyn = DYN ## B (elf->vdata + offset); \
673 while (EGET(dyn->d_tag) != DT_NULL) { \ 955 while (EGET(dyn->d_tag) != DT_NULL) { \
674 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 956 if (EGET(dyn->d_tag) == DT_NEEDED) { \
675 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 957 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
676 if (offset >= (Elf ## B ## _Off)elf->len) { \ 958 if (offset >= (Elf ## B ## _Off)elf->len) { \
677 ++dyn; \ 959 ++dyn; \
678 continue; \ 960 continue; \
679 } \ 961 } \
680 needed = (char*)(elf->data + offset); \ 962 needed = elf->data + offset; \
681 if (op == 0) { \ 963 if (op == 0) { \
964 /* -n -> print all entries */ \
682 if (!be_wewy_wewy_quiet) { \ 965 if (!be_wewy_wewy_quiet) { \
683 if (*found_needed) xchrcat(ret, ',', ret_len); \ 966 if (*found_needed) xchrcat(ret, ',', ret_len); \
684 if (use_ldcache) \ 967 if (use_ldpath) { \
968 if ((p = lookup_config_lib(needed)) != NULL) \
969 needed = p; \
970 } else if (use_ldcache) { \
685 if ((p = lookup_cache_lib(elf, needed)) != NULL) \ 971 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
686 needed = p; \ 972 needed = p; \
973 } \
687 xstrcat(ret, needed, ret_len); \ 974 xstrcat(ret, needed, ret_len); \
688 } \ 975 } \
689 *found_needed = 1; \ 976 *found_needed = 1; \
690 } else { \ 977 } else { \
691 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \ 978 /* -N -> print matching entries */ \
979 size_t n; \
980 const char *find_lib_name; \
981 \
982 array_for_each(find_lib_arr, n, find_lib_name) { \
983 int invert = 1; \
984 if (find_lib_name[0] == '!') \
985 invert = 0, ++find_lib_name; \
986 if (!strcmp(find_lib_name, needed) == invert) \
987 ++matched; \
988 } \
989 \
990 if (matched == array_cnt(find_lib_arr)) { \
692 *found_lib = 1; \ 991 *found_lib = 1; \
693 return (be_wewy_wewy_quiet ? NULL : needed); \ 992 return (be_wewy_wewy_quiet ? NULL : find_lib); \
694 } \ 993 } \
695 } \ 994 } \
696 } \ 995 } \
697 ++dyn; \ 996 ++dyn; \
698 } \ 997 } \
720 *found_interp = 1; \ 1019 *found_interp = 1; \
721 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \ 1020 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
722 } 1021 }
723 SHOW_INTERP(32) 1022 SHOW_INTERP(32)
724 SHOW_INTERP(64) 1023 SHOW_INTERP(64)
1024 } else {
1025 /* Walk all the program headers to find the PT_INTERP */
1026#define SHOW_PT_INTERP(B) \
1027 if (elf->elf_class == ELFCLASS ## B) { \
1028 unsigned long i; \
1029 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1030 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1031 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1032 if (EGET(phdr[i].p_type) != PT_INTERP) \
1033 continue; \
1034 *found_interp = 1; \
1035 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(phdr[i].p_offset)); \
1036 } \
725 } 1037 }
1038 SHOW_PT_INTERP(32)
1039 SHOW_PT_INTERP(64)
1040 }
1041
726 return NULL; 1042 return NULL;
727} 1043}
728static char *scanelf_file_bind(elfobj *elf, char *found_bind) 1044static const char *scanelf_file_bind(elfobj *elf, char *found_bind)
729{ 1045{
730 unsigned long i; 1046 unsigned long i;
731 struct stat s; 1047 struct stat s;
1048 bool dynamic = false;
732 1049
733 if (!show_bind) return NULL; 1050 if (!show_bind) return NULL;
734 if (!elf->phdr) return NULL; 1051 if (!elf->phdr) return NULL;
735 1052
736#define SHOW_BIND(B) \ 1053#define SHOW_BIND(B) \
738 Elf ## B ## _Dyn *dyn; \ 1055 Elf ## B ## _Dyn *dyn; \
739 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 1056 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
740 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 1057 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
741 Elf ## B ## _Off offset; \ 1058 Elf ## B ## _Off offset; \
742 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 1059 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
743 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 1060 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1061 dynamic = true; \
744 offset = EGET(phdr[i].p_offset); \ 1062 offset = EGET(phdr[i].p_offset); \
745 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 1063 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
746 dyn = DYN ## B (elf->data + offset); \ 1064 dyn = DYN ## B (elf->vdata + offset); \
747 while (EGET(dyn->d_tag) != DT_NULL) { \ 1065 while (EGET(dyn->d_tag) != DT_NULL) { \
748 if (EGET(dyn->d_tag) == DT_BIND_NOW || \ 1066 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
749 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \ 1067 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
750 { \ 1068 { \
751 if (be_quiet) return NULL; \ 1069 if (be_quiet) return NULL; \
759 SHOW_BIND(32) 1077 SHOW_BIND(32)
760 SHOW_BIND(64) 1078 SHOW_BIND(64)
761 1079
762 if (be_wewy_wewy_quiet) return NULL; 1080 if (be_wewy_wewy_quiet) return NULL;
763 1081
1082 /* don't output anything if quiet mode and the ELF is static or not setuid */
764 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) { 1083 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
765 return NULL; 1084 return NULL;
766 } else { 1085 } else {
767 *found_bind = 1; 1086 *found_bind = 1;
768 return (char *) "LAZY"; 1087 return dynamic ? "LAZY" : "STATIC";
769 } 1088 }
770} 1089}
771static char *scanelf_file_soname(elfobj *elf, char *found_soname) 1090static char *scanelf_file_soname(elfobj *elf, char *found_soname)
772{ 1091{
773 unsigned long i; 1092 unsigned long i;
785 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 1104 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
786 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 1105 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
787 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 1106 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
788 Elf ## B ## _Off offset; \ 1107 Elf ## B ## _Off offset; \
789 /* only look for soname in shared objects */ \ 1108 /* only look for soname in shared objects */ \
790 if (ehdr->e_type != ET_DYN) \ 1109 if (EGET(ehdr->e_type) != ET_DYN) \
791 return NULL; \ 1110 return NULL; \
792 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 1111 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
793 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 1112 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
794 offset = EGET(phdr[i].p_offset); \ 1113 offset = EGET(phdr[i].p_offset); \
795 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 1114 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
796 dyn = DYN ## B (elf->data + offset); \ 1115 dyn = DYN ## B (elf->vdata + offset); \
797 while (EGET(dyn->d_tag) != DT_NULL) { \ 1116 while (EGET(dyn->d_tag) != DT_NULL) { \
798 if (EGET(dyn->d_tag) == DT_SONAME) { \ 1117 if (EGET(dyn->d_tag) == DT_SONAME) { \
799 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 1118 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
800 if (offset >= (Elf ## B ## _Off)elf->len) { \ 1119 if (offset >= (Elf ## B ## _Off)elf->len) { \
801 ++dyn; \ 1120 ++dyn; \
802 continue; \ 1121 continue; \
803 } \ 1122 } \
804 soname = (char*)(elf->data + offset); \ 1123 soname = elf->data + offset; \
805 *found_soname = 1; \ 1124 *found_soname = 1; \
806 return (be_wewy_wewy_quiet ? NULL : soname); \ 1125 return (be_wewy_wewy_quiet ? NULL : soname); \
807 } \ 1126 } \
808 ++dyn; \ 1127 ++dyn; \
809 } \ 1128 } \
812 SHOW_SONAME(64) 1131 SHOW_SONAME(64)
813 } 1132 }
814 1133
815 return NULL; 1134 return NULL;
816} 1135}
1136
1137/*
1138 * We support the symbol form:
1139 * [%[modifiers]%][[+-]<symbol name>][,[.....]]
1140 * If the symbol name is empty, then all symbols are matched.
1141 * If the symbol name is a glob ("*"), then all symbols are dumped (debug).
1142 * Do not rely on this output format at all.
1143 * Otherwise the symbol name is used to search (either regex or string compare).
1144 * If the first char of the symbol name is a plus ("+"), then only match
1145 * defined symbols. If it's a minus ("-"), only match undefined symbols.
1146 * Putting modifiers in between the percent signs allows for more in depth
1147 * filters. There are groups of modifiers. If you don't specify a member
1148 * of a group, then all types in that group are matched. The current
1149 * groups and their types are:
1150 * STT group: STT_NOTYPE:n STT_OBJECT:o STT_FUNC:f STT_FILE:F
1151 * STB group: STB_LOCAL:l STB_GLOBAL:g STB_WEAK:w
1152 * SHN group: SHN_UNDEF:u SHN_ABS:a SHN_COMMON:c {defined}:d
1153 * The "defined" value in the SHN group does not correspond to a SHN_xxx define.
1154 * You can search for multiple symbols at once by seperating with a comma (",").
1155 *
1156 * Some examples:
1157 * ELFs with a weak function "foo":
1158 * scanelf -s %wf%foo <ELFs>
1159 * ELFs that define the symbol "main":
1160 * scanelf -s +main <ELFs>
1161 * scanelf -s %d%main <ELFs>
1162 * ELFs that refer to the undefined symbol "brk":
1163 * scanelf -s -brk <ELFs>
1164 * scanelf -s %u%brk <ELFs>
1165 * All global defined objects in an ELF:
1166 * scanelf -s %ogd% <ELF>
1167 */
1168static void
1169scanelf_match_symname(elfobj *elf, char *found_sym, char **ret, size_t *ret_len, const char *symname,
1170 unsigned int stt, unsigned int stb, unsigned int shn, unsigned long size)
1171{
1172 const char *this_sym;
1173 size_t n;
1174
1175 array_for_each(find_sym_arr, n, this_sym) {
1176 bool inc_notype, inc_object, inc_func, inc_file,
1177 inc_local, inc_global, inc_weak,
1178 inc_def, inc_undef, inc_abs, inc_common;
1179
1180 /* symbol selection! */
1181 inc_notype = inc_object = inc_func = inc_file = \
1182 inc_local = inc_global = inc_weak = \
1183 inc_def = inc_undef = inc_abs = inc_common = \
1184 (*this_sym != '%');
1185
1186 /* parse the contents of %...% */
1187 if (!inc_notype) {
1188 while (*(this_sym++)) {
1189 if (*this_sym == '%') {
1190 ++this_sym;
1191 break;
1192 }
1193 switch (*this_sym) {
1194 case 'n': inc_notype = true; break;
1195 case 'o': inc_object = true; break;
1196 case 'f': inc_func = true; break;
1197 case 'F': inc_file = true; break;
1198 case 'l': inc_local = true; break;
1199 case 'g': inc_global = true; break;
1200 case 'w': inc_weak = true; break;
1201 case 'd': inc_def = true; break;
1202 case 'u': inc_undef = true; break;
1203 case 'a': inc_abs = true; break;
1204 case 'c': inc_common = true; break;
1205 default: err("invalid symbol selector '%c'", *this_sym);
1206 }
1207 }
1208
1209 /* If no types are matched, not match all */
1210 if (!inc_notype && !inc_object && !inc_func && !inc_file)
1211 inc_notype = inc_object = inc_func = inc_file = true;
1212 if (!inc_local && !inc_global && !inc_weak)
1213 inc_local = inc_global = inc_weak = true;
1214 if (!inc_def && !inc_undef && !inc_abs && !inc_common)
1215 inc_def = inc_undef = inc_abs = inc_common = true;
1216
1217 /* backwards compat for defined/undefined short hand */
1218 } else if (*this_sym == '+') {
1219 inc_undef = false;
1220 ++this_sym;
1221 } else if (*this_sym == '-') {
1222 inc_def = inc_abs = inc_common = false;
1223 ++this_sym;
1224 }
1225
1226 /* filter symbols */
1227 if ((!inc_notype && stt == STT_NOTYPE) || \
1228 (!inc_object && stt == STT_OBJECT) || \
1229 (!inc_func && stt == STT_FUNC ) || \
1230 (!inc_file && stt == STT_FILE ) || \
1231 (!inc_local && stb == STB_LOCAL ) || \
1232 (!inc_global && stb == STB_GLOBAL) || \
1233 (!inc_weak && stb == STB_WEAK ) || \
1234 (!inc_def && shn && shn < SHN_LORESERVE) || \
1235 (!inc_undef && shn == SHN_UNDEF ) || \
1236 (!inc_abs && shn == SHN_ABS ) || \
1237 (!inc_common && shn == SHN_COMMON))
1238 continue;
1239
1240 if (*this_sym == '*') {
1241 /* a "*" symbol gets you debug output */
1242 printf("%s(%s) %5lX %15s %15s %15s %s\n",
1243 ((*found_sym == 0) ? "\n\t" : "\t"),
1244 elf->base_filename,
1245 size,
1246 get_elfstttype(stt),
1247 get_elfstbtype(stb),
1248 get_elfshntype(shn),
1249 symname);
1250 goto matched;
1251
1252 } else {
1253 if (g_match) {
1254 /* regex match the symbol */
1255 if (regexec(find_sym_regex_arr->eles[n], symname, 0, NULL, 0) == REG_NOMATCH)
1256 continue;
1257
1258 } else if (*this_sym) {
1259 /* give empty symbols a "pass", else do a normal compare */
1260 const size_t len = strlen(this_sym);
1261 if (!(strncmp(this_sym, symname, len) == 0 &&
1262 /* Accept unversioned symbol names */
1263 (symname[len] == '\0' || symname[len] == '@')))
1264 continue;
1265 }
1266
1267 if (be_semi_verbose) {
1268 char buf[1024];
1269 snprintf(buf, sizeof(buf), "%lX %s %s",
1270 size,
1271 get_elfstttype(stt),
1272 this_sym);
1273 *ret = xstrdup(buf);
1274 } else {
1275 if (*ret) xchrcat(ret, ',', ret_len);
1276 xstrcat(ret, symname, ret_len);
1277 }
1278
1279 goto matched;
1280 }
1281 }
1282
1283 return;
1284
1285 matched:
1286 *found_sym = 1;
1287}
1288
817static char *scanelf_file_sym(elfobj *elf, char *found_sym) 1289static const char *scanelf_file_sym(elfobj *elf, char *found_sym)
818{ 1290{
819 unsigned long i;
820 char *ret; 1291 char *ret;
821 void *symtab_void, *strtab_void; 1292 void *symtab_void, *strtab_void;
822 1293
823 if (!find_sym) return NULL; 1294 if (!find_sym) return NULL;
824 ret = find_sym; 1295 ret = NULL;
825 1296
826 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void); 1297 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
827 1298
828 if (symtab_void && strtab_void) { 1299 if (symtab_void && strtab_void) {
829#define FIND_SYM(B) \ 1300#define FIND_SYM(B) \
830 if (elf->elf_class == ELFCLASS ## B) { \ 1301 if (elf->elf_class == ELFCLASS ## B) { \
831 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 1302 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
832 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 1303 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
833 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 1304 Elf ## B ## _Sym *sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
834 unsigned long cnt = EGET(symtab->sh_entsize); \ 1305 Elf ## B ## _Word i, cnt = EGET(symtab->sh_entsize); \
835 char *symname; \ 1306 char *symname; \
1307 size_t ret_len = 0; \
836 if (cnt) \ 1308 if (cnt) \
837 cnt = EGET(symtab->sh_size) / cnt; \ 1309 cnt = EGET(symtab->sh_size) / cnt; \
838 for (i = 0; i < cnt; ++i) { \ 1310 for (i = 0; i < cnt; ++i) { \
1311 if ((void*)sym > elf->data_end) { \
1312 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1313 goto break_out; \
1314 } \
839 if (sym->st_name) { \ 1315 if (sym->st_name) { \
1316 /* make sure the symbol name is in acceptable memory range */ \
840 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 1317 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
841 if ((void*)symname > (void*)elf->data_end) { \ 1318 if ((void*)symname > elf->data_end) { \
842 warnf("%s: corrupt ELF symbols", elf->filename); \ 1319 warnf("%s: corrupt ELF symbols", elf->filename); \
1320 ++sym; \
843 continue; \ 1321 continue; \
844 } \ 1322 } \
845 if (*find_sym == '*') { \ 1323 scanelf_match_symname(elf, found_sym, \
846 printf("%s(%s) %5lX %15s %s\n", \ 1324 &ret, &ret_len, symname, \
847 ((*found_sym == 0) ? "\n\t" : "\t"), \ 1325 ELF##B##_ST_TYPE(EGET(sym->st_info)), \
848 elf->base_filename, \ 1326 ELF##B##_ST_BIND(EGET(sym->st_info)), \
849 (unsigned long)sym->st_size, \ 1327 EGET(sym->st_shndx), \
850 get_elfstttype(sym->st_info), \ 1328 /* st_size can be 64bit, but no one is really that big, so screw em */ \
851 symname); \ 1329 EGET(sym->st_size)); \
852 *found_sym = 1; \
853 } else { \
854 char *this_sym, *next_sym; \
855 this_sym = find_sym; \
856 do { \
857 next_sym = strchr(this_sym, ','); \
858 if (next_sym == NULL) \
859 next_sym = this_sym + strlen(this_sym); \
860 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
861 (strcmp(symname, versioned_symname) == 0)) { \
862 ret = this_sym; \
863 (*found_sym)++; \
864 goto break_out; \
865 } \
866 this_sym = next_sym + 1; \
867 } while (*next_sym != '\0'); \
868 } \
869 } \ 1330 } \
870 ++sym; \ 1331 ++sym; \
871 } } 1332 } \
1333 }
872 FIND_SYM(32) 1334 FIND_SYM(32)
873 FIND_SYM(64) 1335 FIND_SYM(64)
874 } 1336 }
875 1337
876break_out: 1338break_out:
879 if (*find_sym != '*' && *found_sym) 1341 if (*find_sym != '*' && *found_sym)
880 return ret; 1342 return ret;
881 if (be_quiet) 1343 if (be_quiet)
882 return NULL; 1344 return NULL;
883 else 1345 else
884 return (char *)" - "; 1346 return " - ";
885} 1347}
886 1348
887
888static char *scanelf_file_sections(elfobj *elf, char *found_section) 1349static const char *scanelf_file_sections(elfobj *elf, char *found_section)
889{ 1350{
890 if (!find_section) 1351 if (!find_section)
891 return NULL; 1352 return NULL;
892 1353
893#define FIND_SECTION(B) \ 1354#define FIND_SECTION(B) \
894 if (elf->elf_class == ELFCLASS ## B) { \ 1355 if (elf->elf_class == ELFCLASS ## B) { \
1356 size_t matched, n; \
1357 int invert; \
1358 const char *section_name; \
895 Elf ## B ## _Shdr *section; \ 1359 Elf ## B ## _Shdr *section; \
1360 \
1361 matched = 0; \
1362 array_for_each(find_section_arr, n, section_name) { \
1363 invert = (*section_name == '!' ? 1 : 0); \
896 section = SHDR ## B (elf_findsecbyname(elf, find_section)); \ 1364 section = SHDR ## B (elf_findsecbyname(elf, section_name + invert)); \
897 if (section != NULL) \ 1365 if ((section == NULL && invert) || (section != NULL && !invert)) \
1366 ++matched; \
1367 } \
1368 \
1369 if (matched == array_cnt(find_section_arr)) \
898 *found_section = 1; \ 1370 *found_section = 1; \
899 } 1371 }
900 FIND_SECTION(32) 1372 FIND_SECTION(32)
901 FIND_SECTION(64) 1373 FIND_SECTION(64)
902 1374
903
904 if (be_wewy_wewy_quiet) return NULL; 1375 if (be_wewy_wewy_quiet)
1376 return NULL;
905 1377
906 if (*found_section) 1378 if (*found_section)
907 return find_section; 1379 return find_section;
908 1380
909 if (be_quiet) 1381 if (be_quiet)
910 return NULL; 1382 return NULL;
911 else 1383 else
912 return (char *)" - "; 1384 return " - ";
913} 1385}
914 1386
915/* scan an elf file and show all the fun stuff */ 1387/* scan an elf file and show all the fun stuff */
916#define prints(str) write(fileno(stdout), str, strlen(str)) 1388#define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
917static int scanelf_elfobj(elfobj *elf) 1389static int scanelf_elfobj(elfobj *elf)
918{ 1390{
919 unsigned long i; 1391 unsigned long i;
920 char found_pax, found_phdr, found_relro, found_load, found_textrel, 1392 char found_pax, found_phdr, found_relro, found_load, found_textrel,
921 found_rpath, found_needed, found_interp, found_bind, found_soname, 1393 found_rpath, found_needed, found_interp, found_bind, found_soname,
922 found_sym, found_lib, found_file, found_textrels, found_section; 1394 found_sym, found_lib, found_file, found_textrels, found_section;
923 static char *out_buffer = NULL; 1395 static char *out_buffer = NULL;
924 static size_t out_len; 1396 static size_t out_len;
925 1397
926 found_pax = found_phdr = found_relro = found_load = found_textrel = \ 1398 found_pax = found_phdr = found_relro = found_load = found_textrel = \
935 printf("%s: scanning file\n", elf->filename); 1407 printf("%s: scanning file\n", elf->filename);
936 1408
937 /* init output buffer */ 1409 /* init output buffer */
938 if (!out_buffer) { 1410 if (!out_buffer) {
939 out_len = sizeof(char) * 80; 1411 out_len = sizeof(char) * 80;
940 out_buffer = (char*)xmalloc(out_len); 1412 out_buffer = xmalloc(out_len);
941 } 1413 }
942 *out_buffer = '\0'; 1414 *out_buffer = '\0';
943 1415
944 /* show the header */ 1416 /* show the header */
945 if (!be_quiet && show_banner) { 1417 if (!be_quiet && show_banner) {
946 for (i = 0; out_format[i]; ++i) { 1418 for (i = 0; out_format[i]; ++i) {
947 if (!IS_MODIFIER(out_format[i])) continue; 1419 if (!IS_MODIFIER(out_format[i])) continue;
948 1420
949 switch (out_format[++i]) { 1421 switch (out_format[++i]) {
1422 case '+': break;
950 case '%': break; 1423 case '%': break;
951 case '#': break; 1424 case '#': break;
952 case 'F': 1425 case 'F':
953 case 'p': 1426 case 'p':
954 case 'f': prints("FILE "); found_file = 1; break; 1427 case 'f': prints("FILE "); found_file = 1; break;
955 case 'o': prints(" TYPE "); break; 1428 case 'o': prints(" TYPE "); break;
956 case 'x': prints(" PAX "); break; 1429 case 'x': prints(" PAX "); break;
957 case 'e': prints("STK/REL/PTL "); break; 1430 case 'e': prints("STK/REL/PTL "); break;
958 case 't': prints("TEXTREL "); break; 1431 case 't': prints("TEXTREL "); break;
959 case 'r': prints("RPATH "); break; 1432 case 'r': prints("RPATH "); break;
1433 case 'M': prints("CLASS "); break;
1434 case 'l':
960 case 'n': prints("NEEDED "); break; 1435 case 'n': prints("NEEDED "); break;
961 case 'i': prints("INTERP "); break; 1436 case 'i': prints("INTERP "); break;
962 case 'b': prints("BIND "); break; 1437 case 'b': prints("BIND "); break;
1438 case 'Z': prints("SIZE "); break;
963 case 'S': prints("SONAME "); break; 1439 case 'S': prints("SONAME "); break;
964 case 's': prints("SYM "); break; 1440 case 's': prints("SYM "); break;
965 case 'N': prints("LIB "); break; 1441 case 'N': prints("LIB "); break;
966 case 'T': prints("TEXTRELS "); break; 1442 case 'T': prints("TEXTRELS "); break;
967 case 'k': prints("SECTION "); break; 1443 case 'k': prints("SECTION "); break;
1444 case 'a': prints("ARCH "); break;
1445 case 'I': prints("OSABI "); break;
1446 case 'Y': prints("EABI "); break;
1447 case 'O': prints("PERM "); break;
1448 case 'D': prints("ENDIAN "); break;
968 default: warnf("'%c' has no title ?", out_format[i]); 1449 default: warnf("'%c' has no title ?", out_format[i]);
969 } 1450 }
970 } 1451 }
971 if (!found_file) prints("FILE "); 1452 if (!found_file) prints("FILE ");
972 prints("\n"); 1453 prints("\n");
976 1457
977 /* dump all the good stuff */ 1458 /* dump all the good stuff */
978 for (i = 0; out_format[i]; ++i) { 1459 for (i = 0; out_format[i]; ++i) {
979 const char *out; 1460 const char *out;
980 const char *tmp; 1461 const char *tmp;
981 1462 static char ubuf[sizeof(unsigned long)*2];
982 if (!IS_MODIFIER(out_format[i])) { 1463 if (!IS_MODIFIER(out_format[i])) {
983 xchrcat(&out_buffer, out_format[i], &out_len); 1464 xchrcat(&out_buffer, out_format[i], &out_len);
984 continue; 1465 continue;
985 } 1466 }
986 1467
987 out = NULL; 1468 out = NULL;
988 be_wewy_wewy_quiet = (out_format[i] == '#'); 1469 be_wewy_wewy_quiet = (out_format[i] == '#');
1470 be_semi_verbose = (out_format[i] == '+');
989 switch (out_format[++i]) { 1471 switch (out_format[++i]) {
1472 case '+':
990 case '%': 1473 case '%':
991 case '#': 1474 case '#':
992 xchrcat(&out_buffer, out_format[i], &out_len); break; 1475 xchrcat(&out_buffer, out_format[i], &out_len); break;
993 case 'F': 1476 case 'F':
994 found_file = 1; 1477 found_file = 1;
1020 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1503 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
1021 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break; 1504 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
1022 case 't': out = scanelf_file_textrel(elf, &found_textrel); break; 1505 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1023 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break; 1506 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
1024 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break; 1507 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1508 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1509 case 'D': out = get_endian(elf); break;
1510 case 'O': out = strfileperms(elf->filename); break;
1025 case 'n': 1511 case 'n':
1026 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break; 1512 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
1027 case 'i': out = scanelf_file_interp(elf, &found_interp); break; 1513 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1028 case 'b': out = scanelf_file_bind(elf, &found_bind); break; 1514 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1029 case 'S': out = scanelf_file_soname(elf, &found_soname); break; 1515 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
1030 case 's': out = scanelf_file_sym(elf, &found_sym); break; 1516 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1031 case 'k': out = scanelf_file_sections(elf, &found_section); break; 1517 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1518 case 'a': out = get_elfemtype(elf); break;
1519 case 'I': out = get_elfosabi(elf); break;
1520 case 'Y': out = get_elf_eabi(elf); break;
1521 case 'Z': snprintf(ubuf, sizeof(ubuf), "%lu", (unsigned long)elf->len); out = ubuf; break;;
1032 default: warnf("'%c' has no scan code?", out_format[i]); 1522 default: warnf("'%c' has no scan code?", out_format[i]);
1033 } 1523 }
1034 if (out) { 1524 if (out)
1035 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
1036 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
1037 xstrncat(&out_buffer, out, &out_len, (tmp-out));
1038 else
1039 xstrcat(&out_buffer, out, &out_len); 1525 xstrcat(&out_buffer, out, &out_len);
1040 }
1041 } 1526 }
1042 1527
1043#define FOUND_SOMETHING() \ 1528#define FOUND_SOMETHING() \
1044 (found_pax || found_phdr || found_relro || found_load || found_textrel || \ 1529 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1045 found_rpath || found_needed || found_interp || found_bind || \ 1530 found_rpath || found_needed || found_interp || found_bind || \
1064 elfobj *elf; 1549 elfobj *elf;
1065 1550
1066 /* verify this is real ELF */ 1551 /* verify this is real ELF */
1067 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) { 1552 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1068 if (be_verbose > 2) printf("%s: not an ELF\n", filename); 1553 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1069 return ret; 1554 return 2;
1070 } 1555 }
1071 switch (match_bits) { 1556 switch (match_bits) {
1072 case 32: 1557 case 32:
1073 if (elf->elf_class != ELFCLASS32) 1558 if (elf->elf_class != ELFCLASS32)
1074 goto label_done; 1559 goto label_done;
1077 if (elf->elf_class != ELFCLASS64) 1562 if (elf->elf_class != ELFCLASS64)
1078 goto label_done; 1563 goto label_done;
1079 break; 1564 break;
1080 default: break; 1565 default: break;
1081 } 1566 }
1082 if (strlen(match_etypes)) { 1567 if (match_etypes) {
1083 char sbuf[126]; 1568 char sbuf[126];
1084 strncpy(sbuf, match_etypes, sizeof(sbuf)); 1569 strncpy(sbuf, match_etypes, sizeof(sbuf));
1085 if (strchr(match_etypes, ',') != NULL) { 1570 if (strchr(match_etypes, ',') != NULL) {
1086 char *p; 1571 char *p;
1087 while((p = strrchr(sbuf, ',')) != NULL) { 1572 while ((p = strrchr(sbuf, ',')) != NULL) {
1088 *p = 0; 1573 *p = 0;
1089 if (atoi(p+1) == get_etype(elf)) 1574 if (etype_lookup(p+1) == get_etype(elf))
1090 goto label_ret; 1575 goto label_ret;
1091 } 1576 }
1092 } 1577 }
1093 if (atoi(sbuf) != get_etype(elf)) 1578 if (etype_lookup(sbuf) != get_etype(elf))
1094 goto label_done; 1579 goto label_done;
1095 } 1580 }
1096 1581
1097label_ret: 1582label_ret:
1098 ret = scanelf_elfobj(elf); 1583 ret = scanelf_elfobj(elf);
1112 1597
1113 ar = ar_open_fd(filename, fd); 1598 ar = ar_open_fd(filename, fd);
1114 if (ar == NULL) 1599 if (ar == NULL)
1115 return 1; 1600 return 1;
1116 1601
1117 ar_buffer = (char*)mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0); 1602 ar_buffer = mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1118 while ((m=ar_next(ar)) != NULL) { 1603 while ((m = ar_next(ar)) != NULL) {
1604 off_t cur_pos = lseek(fd, 0, SEEK_CUR);
1605 if (cur_pos == -1)
1606 errp("lseek() failed");
1119 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size); 1607 elf = readelf_buffer(m->name, ar_buffer + cur_pos, m->size);
1120 if (elf) { 1608 if (elf) {
1121 scanelf_elfobj(elf); 1609 scanelf_elfobj(elf);
1122 unreadelf(elf); 1610 unreadelf(elf);
1123 } 1611 }
1124 } 1612 }
1125 munmap(ar_buffer, len); 1613 munmap(ar_buffer, len);
1126 1614
1127 return 0; 1615 return 0;
1128} 1616}
1129/* scan a file which may be an elf or an archive or some other magical beast */ 1617/* scan a file which may be an elf or an archive or some other magical beast */
1130static void scanelf_file(const char *filename) 1618static int scanelf_fileat(int dir_fd, const char *filename, const struct stat *st_cache)
1131{ 1619{
1620 const struct stat *st = st_cache;
1132 struct stat st; 1621 struct stat symlink_st;
1133 int fd; 1622 int fd;
1134 1623
1135 /* make sure 'filename' exists */
1136 if (lstat(filename, &st) == -1) {
1137 if (be_verbose > 2) printf("%s: does not exist\n", filename);
1138 return;
1139 }
1140
1141 /* always handle regular files and handle symlinked files if no -y */ 1624 /* always handle regular files and handle symlinked files if no -y */
1142 if (S_ISLNK(st.st_mode)) { 1625 if (S_ISLNK(st->st_mode)) {
1143 if (!scan_symlink) return; 1626 if (!scan_symlink)
1144 stat(filename, &st); 1627 return 1;
1628 fstatat(dir_fd, filename, &symlink_st, 0);
1629 st = &symlink_st;
1145 } 1630 }
1631
1146 if (!S_ISREG(st.st_mode)) { 1632 if (!S_ISREG(st->st_mode)) {
1147 if (be_verbose > 2) printf("%s: skipping non-file\n", filename); 1633 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1148 return; 1634 return 1;
1149 } 1635 }
1150 1636
1151 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1) 1637 if (match_perms) {
1638 if ((st->st_mode | match_perms) != st->st_mode)
1639 return 1;
1640 }
1641 fd = openat(dir_fd, filename, (fix_elf ? O_RDWR : O_RDONLY) | O_CLOEXEC);
1642 if (fd == -1) {
1643 if (fix_elf && errno == ETXTBSY)
1644 warnp("%s: could not fix", filename);
1645 else if (be_verbose > 2)
1646 printf("%s: skipping file: %s\n", filename, strerror(errno));
1152 return; 1647 return 1;
1648 }
1153 1649
1154 if (scanelf_elf(filename, fd, st.st_size) == 1 && scan_archives) 1650 if (scanelf_elf(filename, fd, st->st_size) == 2) {
1155 /* if it isn't an ELF, maybe it's an .a archive */ 1651 /* if it isn't an ELF, maybe it's an .a archive */
1652 if (scan_archives)
1156 scanelf_archive(filename, fd, st.st_size); 1653 scanelf_archive(filename, fd, st->st_size);
1157 1654
1655 /*
1656 * unreadelf() implicitly closes its fd, so only close it
1657 * when we are returning it in the non-ELF case
1658 */
1158 close(fd); 1659 close(fd);
1660 }
1661
1662 return 0;
1159} 1663}
1160 1664
1161/* scan a directory for ET_EXEC files and print when we find one */ 1665/* scan a directory for ET_EXEC files and print when we find one */
1162static void scanelf_dir(const char *path) 1666static int scanelf_dirat(int dir_fd, const char *path)
1163{ 1667{
1164 register DIR *dir; 1668 register DIR *dir;
1165 register struct dirent *dentry; 1669 register struct dirent *dentry;
1166 struct stat st_top, st; 1670 struct stat st_top, st;
1167 char buf[__PAX_UTILS_PATH_MAX]; 1671 char buf[__PAX_UTILS_PATH_MAX], *subpath;
1168 size_t pathlen = 0, len = 0; 1672 size_t pathlen = 0, len = 0;
1673 int ret = 0;
1674 int subdir_fd;
1169 1675
1170 /* make sure path exists */ 1676 /* make sure path exists */
1171 if (lstat(path, &st_top) == -1) { 1677 if (fstatat(dir_fd, path, &st_top, AT_SYMLINK_NOFOLLOW) == -1) {
1172 if (be_verbose > 2) printf("%s: does not exist\n", path); 1678 if (be_verbose > 2) printf("%s: does not exist\n", path);
1173 return; 1679 return 1;
1174 } 1680 }
1175 1681
1176 /* ok, if it isn't a directory, assume we can open it */ 1682 /* ok, if it isn't a directory, assume we can open it */
1177 if (!S_ISDIR(st_top.st_mode)) { 1683 if (!S_ISDIR(st_top.st_mode))
1178 scanelf_file(path); 1684 return scanelf_fileat(dir_fd, path, &st_top);
1179 return;
1180 }
1181 1685
1182 /* now scan the dir looking for fun stuff */ 1686 /* now scan the dir looking for fun stuff */
1183 if ((dir = opendir(path)) == NULL) { 1687 subdir_fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
1184 warnf("could not opendir %s: %s", path, strerror(errno)); 1688 if (subdir_fd == -1)
1689 dir = NULL;
1690 else
1691 dir = fdopendir(subdir_fd);
1692 if (dir == NULL) {
1693 if (subdir_fd != -1)
1694 close(subdir_fd);
1695 else if (be_verbose > 2)
1696 printf("%s: skipping dir: %s\n", path, strerror(errno));
1185 return; 1697 return 1;
1186 } 1698 }
1187 if (be_verbose > 1) printf("%s: scanning dir\n", path); 1699 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1188 1700
1189 pathlen = strlen(path); 1701 subpath = stpcpy(buf, path);
1702 if (subpath[-1] != '/')
1703 *subpath++ = '/';
1704 pathlen = subpath - buf;
1190 while ((dentry = readdir(dir))) { 1705 while ((dentry = readdir(dir))) {
1191 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1706 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1192 continue; 1707 continue;
1193 len = (pathlen + 1 + strlen(dentry->d_name) + 1); 1708
1194 if (len >= sizeof(buf)) { 1709 if (fstatat(subdir_fd, dentry->d_name, &st, AT_SYMLINK_NOFOLLOW) == -1)
1195 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1196 (unsigned long)len, (unsigned long)sizeof(buf));
1197 continue; 1710 continue;
1711
1712 len = strlen(dentry->d_name);
1713 if (len + pathlen + 1 >= sizeof(buf)) {
1714 warnf("Skipping '%s%s': len > sizeof(buf); %zu > %zu\n",
1715 path, dentry->d_name, len + pathlen + 1, sizeof(buf));
1716 continue;
1198 } 1717 }
1199 sprintf(buf, "%s/%s", path, dentry->d_name); 1718 memcpy(subpath, dentry->d_name, len);
1200 if (lstat(buf, &st) != -1) { 1719 subpath[len] = '\0';
1720
1201 if (S_ISREG(st.st_mode)) 1721 if (S_ISREG(st.st_mode))
1202 scanelf_file(buf); 1722 ret = scanelf_fileat(dir_fd, buf, &st);
1203 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1723 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1204 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1724 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1205 scanelf_dir(buf); 1725 ret = scanelf_dirat(dir_fd, buf);
1206 }
1207 } 1726 }
1208 } 1727 }
1209 closedir(dir); 1728 closedir(dir);
1210}
1211 1729
1730 return ret;
1731}
1732static int scanelf_dir(const char *path)
1733{
1734 return scanelf_dirat(root_fd, root_rel_path(path));
1735}
1736
1212static int scanelf_from_file(char *filename) 1737static int scanelf_from_file(const char *filename)
1213{ 1738{
1214 FILE *fp = NULL; 1739 FILE *fp;
1215 char *p; 1740 char *p, *path;
1216 char path[__PAX_UTILS_PATH_MAX]; 1741 size_t len;
1742 int ret;
1217 1743
1218 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL)) 1744 if (strcmp(filename, "-") == 0)
1219 fp = stdin; 1745 fp = stdin;
1220 else if ((fp = fopen(filename, "r")) == NULL) 1746 else if ((fp = fopen(filename, "r")) == NULL)
1221 return 1; 1747 return 1;
1222 1748
1223 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) { 1749 path = NULL;
1750 len = 0;
1751 ret = 0;
1752 while (getline(&path, &len, fp) != -1) {
1224 if ((p = strchr(path, '\n')) != NULL) 1753 if ((p = strchr(path, '\n')) != NULL)
1225 *p = 0; 1754 *p = 0;
1226 search_path = path; 1755 search_path = path;
1227 scanelf_dir(path); 1756 ret = scanelf_dir(path);
1228 } 1757 }
1758 free(path);
1759
1229 if (fp != stdin) 1760 if (fp != stdin)
1230 fclose(fp); 1761 fclose(fp);
1762
1231 return 0; 1763 return ret;
1232} 1764}
1233 1765
1766#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1767
1234static int load_ld_so_conf(int i, const char *fname) 1768static int _load_ld_cache_config(const char *fname)
1235{ 1769{
1236 FILE *fp = NULL; 1770 FILE *fp = NULL;
1237 char *p; 1771 char *p, *path;
1238 char path[__PAX_UTILS_PATH_MAX]; 1772 size_t len;
1773 int curr_fd = -1;
1239 1774
1240 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths)) 1775 fp = fopenat_r(root_fd, root_rel_path(fname));
1776 if (fp == NULL)
1241 return i; 1777 return -1;
1242 1778
1243 if ((fp = fopen(fname, "r")) == NULL) 1779 path = NULL;
1244 return i; 1780 len = 0;
1245 1781 while (getline(&path, &len, fp) != -1) {
1246 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1247 if ((p = strrchr(path, '\r')) != NULL) 1782 if ((p = strrchr(path, '\r')) != NULL)
1248 *p = 0; 1783 *p = 0;
1249 if ((p = strchr(path, '\n')) != NULL) 1784 if ((p = strchr(path, '\n')) != NULL)
1250 *p = 0; 1785 *p = 0;
1251#ifdef HAVE_GLOB 1786
1252 // recursive includes of the same file will make this segfault. 1787 /* recursive includes of the same file will make this segfault. */
1253 if ((*path == 'i') && (strncmp(path, "include", 7) == 0) && isblank(path[7])) { 1788 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1254 glob64_t gl; 1789 glob_t gl;
1255 size_t x; 1790 size_t x;
1256 char gpath[__PAX_UTILS_PATH_MAX]; 1791 const char *gpath;
1257 1792
1258 gpath[sizeof(gpath)] = 0; 1793 /* re-use existing path buffer ... need to be creative */
1259
1260 if (path[8] != '/') 1794 if (path[8] != '/')
1261 snprintf(gpath, sizeof(gpath)-1, "/etc/%s", &path[8]); 1795 gpath = memcpy(path + 3, "/etc/", 5);
1262 else 1796 else
1263 strncpy(gpath, &path[8], sizeof(gpath)-1); 1797 gpath = path + 8;
1798 if (root_fd != AT_FDCWD) {
1799 if (curr_fd == -1) {
1800 curr_fd = open(".", O_RDONLY|O_CLOEXEC);
1801 if (fchdir(root_fd))
1802 errp("unable to change to root dir");
1803 }
1804 gpath = root_rel_path(gpath);
1805 }
1264 1806
1265 if ((glob64(gpath, 0, NULL, &gl)) == 0) { 1807 if (glob(gpath, 0, NULL, &gl) == 0) {
1266 for (x = 0; x < gl.gl_pathc; ++x) { 1808 for (x = 0; x < gl.gl_pathc; ++x) {
1267 /* try to avoid direct loops */ 1809 /* try to avoid direct loops */
1268 if (strcmp(gl.gl_pathv[x], fname) == 0) 1810 if (strcmp(gl.gl_pathv[x], fname) == 0)
1269 continue; 1811 continue;
1270 i = load_ld_so_conf(i, gl.gl_pathv[x]); 1812 _load_ld_cache_config(gl.gl_pathv[x]);
1271 if (i + 1 >= sizeof(ldpaths) / sizeof(*ldpaths)) {
1272 globfree64(&gl);
1273 return i;
1274 }
1275 } 1813 }
1276 globfree64 (&gl); 1814 globfree(&gl);
1815 }
1816
1817 /* failed globs are ignored by glibc */
1277 continue; 1818 continue;
1278 } else
1279 abort();
1280 } 1819 }
1281#endif 1820
1282 if (*path != '/') 1821 if (*path != '/')
1283 continue; 1822 continue;
1284 1823
1285 ldpaths[i++] = xstrdup(path); 1824 xarraypush_str(ldpaths, path);
1286
1287 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
1288 break;
1289 } 1825 }
1290 ldpaths[i] = NULL; 1826 free(path);
1291 1827
1292 fclose(fp); 1828 fclose(fp);
1829
1830 if (curr_fd != -1) {
1831 if (fchdir(curr_fd))
1832 {/* don't care */}
1833 close(curr_fd);
1834 }
1835
1293 return i; 1836 return 0;
1837}
1838
1839#elif defined(__FreeBSD__) || defined(__DragonFly__)
1840
1841static int _load_ld_cache_config(const char *fname)
1842{
1843 FILE *fp = NULL;
1844 char *b = NULL, *p;
1845 struct elfhints_hdr hdr;
1846
1847 fp = fopenat_r(root_fd, root_rel_path(fname));
1848 if (fp == NULL)
1849 return -1;
1850
1851 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1852 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1853 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1854 {
1855 fclose(fp);
1856 return -1;
1857 }
1858
1859 b = xmalloc(hdr.dirlistlen + 1);
1860 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1861 fclose(fp);
1862 free(b);
1863 return -1;
1864 }
1865
1866 while ((p = strsep(&b, ":"))) {
1867 if (*p == '\0')
1868 continue;
1869 xarraypush_str(ldpaths, p);
1870 }
1871
1872 free(b);
1873 fclose(fp);
1874 return 0;
1875}
1876
1877#else
1878#ifdef __ELF__
1879#warning Cache config support not implemented for your target
1880#endif
1881static int _load_ld_cache_config(const char *fname)
1882{
1883 return 0;
1884}
1885#endif
1886
1887static void load_ld_cache_config(const char *fname)
1888{
1889 bool scan_l, scan_ul, scan_ull;
1890 size_t n;
1891 const char *ldpath;
1892
1893 _load_ld_cache_config(fname);
1894
1895 scan_l = scan_ul = scan_ull = false;
1896 if (array_cnt(ldpaths)) {
1897 array_for_each(ldpaths, n, ldpath) {
1898 if (!scan_l && !strcmp(ldpath, "/lib")) scan_l = true;
1899 if (!scan_ul && !strcmp(ldpath, "/usr/lib")) scan_ul = true;
1900 if (!scan_ull && !strcmp(ldpath, "/usr/local/lib")) scan_ull = true;
1901 }
1902 }
1903
1904 if (!scan_l) xarraypush_str(ldpaths, "/lib");
1905 if (!scan_ul) xarraypush_str(ldpaths, "/usr/lib");
1906 if (!scan_ull) xarraypush_str(ldpaths, "/usr/local/lib");
1294} 1907}
1295 1908
1296/* scan /etc/ld.so.conf for paths */ 1909/* scan /etc/ld.so.conf for paths */
1297static void scanelf_ldpath() 1910static void scanelf_ldpath(void)
1298{ 1911{
1299 char scan_l, scan_ul, scan_ull; 1912 size_t n;
1300 int i = 0; 1913 const char *ldpath;
1301 1914
1302 if (!ldpaths[0]) 1915 array_for_each(ldpaths, n, ldpath)
1303 err("Unable to load any paths from ld.so.conf");
1304
1305 scan_l = scan_ul = scan_ull = 0;
1306
1307 while (ldpaths[i]) {
1308 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
1309 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
1310 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
1311 scanelf_dir(ldpaths[i]); 1916 scanelf_dir(ldpath);
1312 ++i;
1313 }
1314
1315 if (!scan_l) scanelf_dir("/lib");
1316 if (!scan_ul) scanelf_dir("/usr/lib");
1317 if (!scan_ull) scanelf_dir("/usr/local/lib");
1318} 1917}
1319 1918
1320/* scan env PATH for paths */ 1919/* scan env PATH for paths */
1321static void scanelf_envpath() 1920static void scanelf_envpath(void)
1322{ 1921{
1323 char *path, *p; 1922 char *path, *p;
1324 1923
1325 path = getenv("PATH"); 1924 path = getenv("PATH");
1326 if (!path) 1925 if (!path)
1333 } 1932 }
1334 1933
1335 free(path); 1934 free(path);
1336} 1935}
1337 1936
1338/* usage / invocation handling functions */ 1937/* usage / invocation handling functions */ /* Free Flags: c d j u w G H J K P Q U W */
1339#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:BhV" 1938#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZCBhV"
1340#define a_argument required_argument 1939#define a_argument required_argument
1341static struct option const long_opts[] = { 1940static struct option const long_opts[] = {
1342 {"path", no_argument, NULL, 'p'}, 1941 {"path", no_argument, NULL, 'p'},
1343 {"ldpath", no_argument, NULL, 'l'}, 1942 {"ldpath", no_argument, NULL, 'l'},
1943 {"use-ldpath",no_argument, NULL, 129},
1944 {"root", a_argument, NULL, 128},
1344 {"recursive", no_argument, NULL, 'R'}, 1945 {"recursive", no_argument, NULL, 'R'},
1345 {"mount", no_argument, NULL, 'm'}, 1946 {"mount", no_argument, NULL, 'm'},
1346 {"symlink", no_argument, NULL, 'y'}, 1947 {"symlink", no_argument, NULL, 'y'},
1347 {"archives", no_argument, NULL, 'A'}, 1948 {"archives", no_argument, NULL, 'A'},
1348 {"ldcache", no_argument, NULL, 'L'}, 1949 {"ldcache", no_argument, NULL, 'L'},
1361 {"lib", a_argument, NULL, 'N'}, 1962 {"lib", a_argument, NULL, 'N'},
1362 {"gmatch", no_argument, NULL, 'g'}, 1963 {"gmatch", no_argument, NULL, 'g'},
1363 {"textrels", no_argument, NULL, 'T'}, 1964 {"textrels", no_argument, NULL, 'T'},
1364 {"etype", a_argument, NULL, 'E'}, 1965 {"etype", a_argument, NULL, 'E'},
1365 {"bits", a_argument, NULL, 'M'}, 1966 {"bits", a_argument, NULL, 'M'},
1967 {"endian", no_argument, NULL, 'D'},
1968 {"osabi", no_argument, NULL, 'I'},
1969 {"eabi", no_argument, NULL, 'Y'},
1970 {"perms", a_argument, NULL, 'O'},
1971 {"size", no_argument, NULL, 'Z'},
1366 {"all", no_argument, NULL, 'a'}, 1972 {"all", no_argument, NULL, 'a'},
1367 {"quiet", no_argument, NULL, 'q'}, 1973 {"quiet", no_argument, NULL, 'q'},
1368 {"verbose", no_argument, NULL, 'v'}, 1974 {"verbose", no_argument, NULL, 'v'},
1369 {"format", a_argument, NULL, 'F'}, 1975 {"format", a_argument, NULL, 'F'},
1370 {"from", a_argument, NULL, 'f'}, 1976 {"from", a_argument, NULL, 'f'},
1371 {"file", a_argument, NULL, 'o'}, 1977 {"file", a_argument, NULL, 'o'},
1978 {"nocolor", no_argument, NULL, 'C'},
1372 {"nobanner", no_argument, NULL, 'B'}, 1979 {"nobanner", no_argument, NULL, 'B'},
1373 {"help", no_argument, NULL, 'h'}, 1980 {"help", no_argument, NULL, 'h'},
1374 {"version", no_argument, NULL, 'V'}, 1981 {"version", no_argument, NULL, 'V'},
1375 {NULL, no_argument, NULL, 0x0} 1982 {NULL, no_argument, NULL, 0x0}
1376}; 1983};
1377 1984
1378static const char *opts_help[] = { 1985static const char * const opts_help[] = {
1379 "Scan all directories in PATH environment", 1986 "Scan all directories in PATH environment",
1380 "Scan all directories in /etc/ld.so.conf", 1987 "Scan all directories in /etc/ld.so.conf",
1988 "Use ld.so.conf to show full path (use with -r/-n)",
1989 "Root directory (use with -l or -p)",
1381 "Scan directories recursively", 1990 "Scan directories recursively",
1382 "Don't recursively cross mount points", 1991 "Don't recursively cross mount points",
1383 "Don't scan symlinks", 1992 "Don't scan symlinks",
1384 "Scan archives (.a files)", 1993 "Scan archives (.a files)",
1385 "Utilize ld.so.cache information (use with -r/-n)", 1994 "Utilize ld.so.cache to show full path (use with -r/-n)",
1386 "Try and 'fix' bad things (use with -r/-e)", 1995 "Try and 'fix' bad things (use with -r/-e)",
1387 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n", 1996 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1388 "Print PaX markings", 1997 "Print PaX markings",
1389 "Print GNU_STACK/PT_LOAD markings", 1998 "Print GNU_STACK/PT_LOAD markings",
1390 "Print TEXTREL information", 1999 "Print TEXTREL information",
1394 "Print BIND information", 2003 "Print BIND information",
1395 "Print SONAME information", 2004 "Print SONAME information",
1396 "Find a specified symbol", 2005 "Find a specified symbol",
1397 "Find a specified section", 2006 "Find a specified section",
1398 "Find a specified library", 2007 "Find a specified library",
1399 "Use strncmp to match libraries. (use with -N)", 2008 "Use regex rather than string compare (with -s); specify twice for case insensitive",
1400 "Locate cause of TEXTREL", 2009 "Locate cause of TEXTREL",
1401 "Print only ELF files matching numeric constant type", 2010 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1402 "Print only ELF files matching numeric bits", 2011 "Print only ELF files matching numeric bits",
1403 "Print all scanned info (-x -e -t -r -b)\n", 2012 "Print Endianness",
2013 "Print OSABI",
2014 "Print EABI (EM_ARM Only)",
2015 "Print only ELF files matching octal permissions",
2016 "Print ELF file size",
2017 "Print all useful/simple info\n",
1404 "Only output 'bad' things", 2018 "Only output 'bad' things",
1405 "Be verbose (can be specified more than once)", 2019 "Be verbose (can be specified more than once)",
1406 "Use specified format for output", 2020 "Use specified format for output",
1407 "Read input stream from a filename", 2021 "Read input stream from a filename",
1408 "Write output stream to a filename", 2022 "Write output stream to a filename",
2023 "Don't emit color in output",
1409 "Don't display the header", 2024 "Don't display the header",
1410 "Print this help and exit", 2025 "Print this help and exit",
1411 "Print version and exit", 2026 "Print version and exit",
1412 NULL 2027 NULL
1413}; 2028};
1414 2029
1415/* display usage and exit */ 2030/* display usage and exit */
1416static void usage(int status) 2031static void usage(int status)
1417{ 2032{
1418 unsigned long i; 2033 const char a_arg[] = "<arg>";
2034 size_t a_arg_len = strlen(a_arg) + 2;
2035 size_t i;
2036 int optlen;
1419 printf("* Scan ELF binaries for stuff\n\n" 2037 printf("* Scan ELF binaries for stuff\n\n"
1420 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0); 2038 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1421 printf("Options: -[%s]\n", PARSE_FLAGS); 2039 printf("Options: -[%s]\n", PARSE_FLAGS);
2040
2041 /* prescan the --long opt length to auto-align */
2042 optlen = 0;
1422 for (i = 0; long_opts[i].name; ++i) 2043 for (i = 0; long_opts[i].name; ++i) {
2044 int l = strlen(long_opts[i].name);
2045 if (long_opts[i].has_arg == a_argument)
2046 l += a_arg_len;
2047 optlen = max(l, optlen);
2048 }
2049
2050 for (i = 0; long_opts[i].name; ++i) {
2051 /* first output the short flag if it has one */
2052 if (long_opts[i].val > '~')
2053 printf(" ");
2054 else
2055 printf(" -%c, ", long_opts[i].val);
2056
2057 /* then the long flag */
1423 if (long_opts[i].has_arg == no_argument) 2058 if (long_opts[i].has_arg == no_argument)
1424 printf(" -%c, --%-14s* %s\n", long_opts[i].val, 2059 printf("--%-*s", optlen, long_opts[i].name);
1425 long_opts[i].name, opts_help[i]);
1426 else 2060 else
1427 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val, 2061 printf("--%s %s %*s", long_opts[i].name, a_arg,
1428 long_opts[i].name, opts_help[i]); 2062 (int)(optlen - strlen(long_opts[i].name) - a_arg_len), "");
1429 2063
1430 if (status != EXIT_SUCCESS) 2064 /* finally the help text */
1431 exit(status); 2065 printf("* %s\n", opts_help[i]);
1432 2066 }
1433 puts("\nThe format modifiers for the -F option are:");
1434 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1435 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1436 puts(" i INTERP \tb BIND \ts symbol");
1437 puts(" N library \to Type \tT TEXTRELs");
1438 puts(" S SONAME \tk section");
1439 puts(" p filename (with search path removed)");
1440 puts(" f filename (short name/basename)");
1441 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1442 2067
1443 puts("\nELF Etypes:"); 2068 puts("\nFor more information, see the scanelf(1) manpage");
1444 print_etypes(stdout);
1445
1446 exit(status); 2069 exit(status);
1447} 2070}
1448 2071
1449/* parse command line arguments and preform needed actions */ 2072/* parse command line arguments and preform needed actions */
2073#define do_pax_state(option, flag) \
2074 if (islower(option)) { \
2075 flags &= ~PF_##flag; \
2076 flags |= PF_NO##flag; \
2077 } else { \
2078 flags &= ~PF_NO##flag; \
2079 flags |= PF_##flag; \
2080 }
1450static void parseargs(int argc, char *argv[]) 2081static int parseargs(int argc, char *argv[])
1451{ 2082{
1452 int i; 2083 int i;
1453 char *from_file = NULL; 2084 const char *from_file = NULL;
2085 int ret = 0;
2086 char load_cache_config = 0;
1454 2087
1455 opterr = 0; 2088 opterr = 0;
1456 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 2089 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1457 switch (i) { 2090 switch (i) {
1458 2091
1466 case 'f': 2099 case 'f':
1467 if (from_file) warn("You prob don't want to specify -f twice"); 2100 if (from_file) warn("You prob don't want to specify -f twice");
1468 from_file = optarg; 2101 from_file = optarg;
1469 break; 2102 break;
1470 case 'E': 2103 case 'E':
1471 strncpy(match_etypes, optarg, sizeof(match_etypes)); 2104 match_etypes = optarg;
1472 break; 2105 break;
1473 case 'M': 2106 case 'M':
1474 match_bits = atoi(optarg); 2107 match_bits = atoi(optarg);
2108 if (match_bits == 0) {
2109 if (strcmp(optarg, "ELFCLASS32") == 0)
2110 match_bits = 32;
2111 if (strcmp(optarg, "ELFCLASS64") == 0)
2112 match_bits = 64;
2113 }
2114 break;
2115 case 'O':
2116 if (sscanf(optarg, "%o", &match_perms) == -1)
2117 match_bits = 0;
1475 break; 2118 break;
1476 case 'o': { 2119 case 'o': {
1477 FILE *fp = NULL;
1478 if ((fp = freopen(optarg, "w", stdout)) == NULL) 2120 if (freopen(optarg, "w", stdout) == NULL)
1479 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 2121 errp("Could not freopen(%s)", optarg);
1480 SET_STDOUT(fp);
1481 break; 2122 break;
1482 } 2123 }
1483 case 'k': 2124 case 'k':
1484 if (find_section) warn("You prob don't want to specify -k twice"); 2125 xarraypush_str(find_section_arr, optarg);
1485 find_section = optarg;
1486 break; 2126 break;
1487 case 's': { 2127 case 's': {
1488 if (find_sym) warn("You prob don't want to specify -s twice"); 2128 /* historically, this was comma delimited */
1489 find_sym = optarg; 2129 char *this_sym = strtok(optarg, ",");
1490 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1)); 2130 if (!this_sym) /* edge case: -s '' */
1491 sprintf(versioned_symname, "%s@", find_sym); 2131 xarraypush_str(find_sym_arr, "");
2132 while (this_sym) {
2133 xarraypush_str(find_sym_arr, this_sym);
2134 this_sym = strtok(NULL, ",");
2135 }
1492 break; 2136 break;
1493 } 2137 }
1494 case 'N': { 2138 case 'N':
1495 if (find_lib) warn("You prob don't want to specify -N twice"); 2139 xarraypush_str(find_lib_arr, optarg);
1496 find_lib = optarg;
1497 break; 2140 break;
1498 }
1499
1500 case 'F': { 2141 case 'F': {
1501 if (out_format) warn("You prob don't want to specify -F twice"); 2142 if (out_format) warn("You prob don't want to specify -F twice");
1502 out_format = optarg; 2143 out_format = optarg;
1503 break; 2144 break;
1504 } 2145 }
1505 case 'z': { 2146 case 'z': {
1506 unsigned long flags = 10240; 2147 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1507 size_t x; 2148 size_t x;
1508 2149
1509#define do_state(option, flag) \
1510 if (islower(option)) { \
1511 flags &= ~PF_##flag; \
1512 flags |= PF_NO##flag; \
1513 } else { \
1514 flags &= ~PF_NO##flag; \
1515 flags |= PF_##flag; \
1516 }
1517
1518 for (x = 0 ; x < strlen(optarg); x++) { 2150 for (x = 0; x < strlen(optarg); x++) {
1519 switch(optarg[x]) { 2151 switch (optarg[x]) {
1520 case 'p': 2152 case 'p':
1521 case 'P': 2153 case 'P':
1522 do_state(optarg[x], PAGEEXEC); 2154 do_pax_state(optarg[x], PAGEEXEC);
1523 break; 2155 break;
1524 case 's': 2156 case 's':
1525 case 'S': 2157 case 'S':
1526 do_state(optarg[x], SEGMEXEC); 2158 do_pax_state(optarg[x], SEGMEXEC);
1527 break; 2159 break;
1528 case 'm': 2160 case 'm':
1529 case 'M': 2161 case 'M':
1530 do_state(optarg[x], MPROTECT); 2162 do_pax_state(optarg[x], MPROTECT);
1531 break; 2163 break;
1532 case 'e': 2164 case 'e':
1533 case 'E': 2165 case 'E':
1534 do_state(optarg[x], EMUTRAMP); 2166 do_pax_state(optarg[x], EMUTRAMP);
1535 break; 2167 break;
1536 case 'r': 2168 case 'r':
1537 case 'R': 2169 case 'R':
1538 do_state(optarg[x], RANDMMAP); 2170 do_pax_state(optarg[x], RANDMMAP);
1539 break; 2171 break;
1540 case 'x': 2172 case 'x':
1541 case 'X': 2173 case 'X':
1542 do_state(optarg[x], RANDEXEC); 2174 do_pax_state(optarg[x], RANDEXEC);
1543 break; 2175 break;
1544 default: 2176 default:
1545 break; 2177 break;
1546 } 2178 }
1547 } 2179 }
1552 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) || 2184 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1553 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)))) 2185 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1554 setpax = flags; 2186 setpax = flags;
1555 break; 2187 break;
1556 } 2188 }
2189 case 'Z': show_size = 1; break;
1557 case 'g': gmatch = 1; break; 2190 case 'g': ++g_match; break;
1558 case 'L': use_ldcache = 1; break; 2191 case 'L': load_cache_config = use_ldcache = 1; break;
1559 case 'y': scan_symlink = 0; break; 2192 case 'y': scan_symlink = 0; break;
1560 case 'A': scan_archives = 1; break; 2193 case 'A': scan_archives = 1; break;
2194 case 'C': color_init(true); break;
1561 case 'B': show_banner = 0; break; 2195 case 'B': show_banner = 0; break;
1562 case 'l': scan_ldpath = 1; break; 2196 case 'l': load_cache_config = scan_ldpath = 1; break;
1563 case 'p': scan_envpath = 1; break; 2197 case 'p': scan_envpath = 1; break;
1564 case 'R': dir_recurse = 1; break; 2198 case 'R': dir_recurse = 1; break;
1565 case 'm': dir_crossmount = 0; break; 2199 case 'm': dir_crossmount = 0; break;
1566 case 'X': ++fix_elf; break; 2200 case 'X': ++fix_elf; break;
1567 case 'x': show_pax = 1; break; 2201 case 'x': show_pax = 1; break;
1571 case 'n': show_needed = 1; break; 2205 case 'n': show_needed = 1; break;
1572 case 'i': show_interp = 1; break; 2206 case 'i': show_interp = 1; break;
1573 case 'b': show_bind = 1; break; 2207 case 'b': show_bind = 1; break;
1574 case 'S': show_soname = 1; break; 2208 case 'S': show_soname = 1; break;
1575 case 'T': show_textrels = 1; break; 2209 case 'T': show_textrels = 1; break;
1576 case 'q': be_quiet = 1; break; 2210 case 'q': be_quiet = min(be_quiet, 20) + 1; break;
1577 case 'v': be_verbose = (be_verbose % 20) + 1; break; 2211 case 'v': be_verbose = min(be_verbose, 20) + 1; break;
1578 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break; 2212 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
1579 2213 case 'D': show_endian = 1; break;
2214 case 'I': show_osabi = 1; break;
2215 case 'Y': show_eabi = 1; break;
2216 case 128:
2217 root_fd = open(optarg, O_RDONLY|O_CLOEXEC);
2218 if (root_fd == -1)
2219 err("Could not open root: %s", optarg);
2220 break;
2221 case 129: load_cache_config = use_ldpath = 1; break;
1580 case ':': 2222 case ':':
1581 err("Option '%c' is missing parameter", optopt); 2223 err("Option '%c' is missing parameter", optopt);
1582 case '?': 2224 case '?':
1583 err("Unknown option '%c' or argument missing", optopt); 2225 err("Unknown option '%c' or argument missing", optopt);
1584 default: 2226 default:
1585 err("Unhandled option '%c'; please report this", i); 2227 err("Unhandled option '%c'; please report this", i);
1586 } 2228 }
1587 } 2229 }
2230 if (show_textrels && be_verbose)
2231 has_objdump = bin_in_path("objdump");
2232 /* precompile all the regexes */
2233 if (g_match) {
2234 regex_t preg;
2235 const char *this_sym;
2236 size_t n;
2237 int flags = REG_EXTENDED | REG_NOSUB | (g_match > 1 ? REG_ICASE : 0);
1588 2238
2239 array_for_each(find_sym_arr, n, this_sym) {
2240 /* see scanelf_match_symname for logic info */
2241 switch (this_sym[0]) {
2242 case '%':
2243 while (*(this_sym++))
2244 if (*this_sym == '%') {
2245 ++this_sym;
2246 break;
2247 }
2248 break;
2249 case '+':
2250 case '-':
2251 ++this_sym;
2252 break;
2253 }
2254 if (*this_sym == '*')
2255 ++this_sym;
2256
2257 ret = regcomp(&preg, this_sym, flags);
2258 if (ret) {
2259 char err[256];
2260 regerror(ret, &preg, err, sizeof(err));
2261 err("regcomp of %s failed: %s", this_sym, err);
2262 }
2263 xarraypush(find_sym_regex_arr, &preg, sizeof(preg));
2264 }
2265 }
2266 /* flatten arrays for display */
2267 if (array_cnt(find_sym_arr))
2268 find_sym = array_flatten_str(find_sym_arr);
2269 if (array_cnt(find_lib_arr))
2270 find_lib = array_flatten_str(find_lib_arr);
2271 if (array_cnt(find_section_arr))
2272 find_section = array_flatten_str(find_section_arr);
1589 /* let the format option override all other options */ 2273 /* let the format option override all other options */
1590 if (out_format) { 2274 if (out_format) {
1591 show_pax = show_phdr = show_textrel = show_rpath = \ 2275 show_pax = show_phdr = show_textrel = show_rpath = \
1592 show_needed = show_interp = show_bind = show_soname = \ 2276 show_needed = show_interp = show_bind = show_soname = \
1593 show_textrels = 0; 2277 show_textrels = show_perms = show_endian = show_size = \
2278 show_osabi = show_eabi = 0;
1594 for (i = 0; out_format[i]; ++i) { 2279 for (i = 0; out_format[i]; ++i) {
1595 if (!IS_MODIFIER(out_format[i])) continue; 2280 if (!IS_MODIFIER(out_format[i])) continue;
1596 2281
1597 switch (out_format[++i]) { 2282 switch (out_format[++i]) {
2283 case '+': break;
1598 case '%': break; 2284 case '%': break;
1599 case '#': break; 2285 case '#': break;
1600 case 'F': break; 2286 case 'F': break;
1601 case 'p': break; 2287 case 'p': break;
1602 case 'f': break; 2288 case 'f': break;
1603 case 'k': break; 2289 case 'k': break;
1604 case 's': break; 2290 case 's': break;
1605 case 'N': break; 2291 case 'N': break;
1606 case 'o': break; 2292 case 'o': break;
2293 case 'a': break;
2294 case 'M': break;
2295 case 'Z': show_size = 1; break;
2296 case 'D': show_endian = 1; break;
2297 case 'I': show_osabi = 1; break;
2298 case 'Y': show_eabi = 1; break;
2299 case 'O': show_perms = 1; break;
1607 case 'x': show_pax = 1; break; 2300 case 'x': show_pax = 1; break;
1608 case 'e': show_phdr = 1; break; 2301 case 'e': show_phdr = 1; break;
1609 case 't': show_textrel = 1; break; 2302 case 't': show_textrel = 1; break;
1610 case 'r': show_rpath = 1; break; 2303 case 'r': show_rpath = 1; break;
1611 case 'n': show_needed = 1; break; 2304 case 'n': show_needed = 1; break;
1612 case 'i': show_interp = 1; break; 2305 case 'i': show_interp = 1; break;
1613 case 'b': show_bind = 1; break; 2306 case 'b': show_bind = 1; break;
1614 case 'S': show_soname = 1; break; 2307 case 'S': show_soname = 1; break;
1615 case 'T': show_textrels = 1; break; 2308 case 'T': show_textrels = 1; break;
1616 default: 2309 default:
1617 err("Invalid format specifier '%c' (byte %i)", 2310 err("invalid format specifier '%c' (byte %i)",
1618 out_format[i], i+1); 2311 out_format[i], i+1);
1619 } 2312 }
1620 } 2313 }
1621 2314
1622 /* construct our default format */ 2315 /* construct our default format */
1623 } else { 2316 } else {
1624 size_t fmt_len = 30; 2317 size_t fmt_len = 30;
1625 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 2318 out_format = xmalloc(sizeof(char) * fmt_len);
2319 *out_format = '\0';
1626 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 2320 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1627 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len); 2321 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
2322 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
2323 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
2324 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
2325 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
2326 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
1628 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len); 2327 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1629 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 2328 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1630 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 2329 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1631 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 2330 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1632 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 2331 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1639 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 2338 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1640 } 2339 }
1641 if (be_verbose > 2) printf("Format: %s\n", out_format); 2340 if (be_verbose > 2) printf("Format: %s\n", out_format);
1642 2341
1643 /* now lets actually do the scanning */ 2342 /* now lets actually do the scanning */
1644 if (scan_ldpath || use_ldcache) 2343 if (load_cache_config)
1645 load_ld_so_conf(0, "/etc/ld.so.conf"); 2344 load_ld_cache_config(__PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
1646 if (scan_ldpath) scanelf_ldpath(); 2345 if (scan_ldpath) scanelf_ldpath();
1647 if (scan_envpath) scanelf_envpath(); 2346 if (scan_envpath) scanelf_envpath();
2347 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
2348 from_file = "-";
1648 if (from_file) { 2349 if (from_file) {
1649 scanelf_from_file(from_file); 2350 scanelf_from_file(from_file);
1650 from_file = *argv; 2351 from_file = *argv;
1651 } 2352 }
1652 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file) 2353 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1653 err("Nothing to scan !?"); 2354 err("Nothing to scan !?");
1654 while (optind < argc) { 2355 while (optind < argc) {
1655 search_path = argv[optind++]; 2356 search_path = argv[optind++];
1656 scanelf_dir(search_path); 2357 ret = scanelf_dir(search_path);
1657 } 2358 }
1658 2359
2360#ifdef __PAX_UTILS_CLEANUP
1659 /* clean up */ 2361 /* clean up */
1660 if (versioned_symname) free(versioned_symname);
1661 for (i = 0; ldpaths[i]; ++i)
1662 free(ldpaths[i]); 2362 xarrayfree(ldpaths);
2363 xarrayfree(find_sym_arr);
2364 xarrayfree(find_lib_arr);
2365 xarrayfree(find_section_arr);
2366 free(find_sym);
2367 free(find_lib);
2368 free(find_section);
2369 {
2370 size_t n;
2371 regex_t *preg;
2372 array_for_each(find_sym_regex_arr, n, preg)
2373 regfree(preg);
2374 xarrayfree(find_sym_regex_arr);
2375 }
1663 2376
1664 if (ldcache != 0) 2377 if (ldcache != 0)
1665 munmap(ldcache, ldcache_size); 2378 munmap(ldcache, ldcache_size);
1666} 2379#endif
1667 2380
1668
1669
1670/* utility funcs */
1671static char *xstrdup(const char *s)
1672{
1673 char *ret = strdup(s);
1674 if (!ret) err("Could not strdup(): %s", strerror(errno));
1675 return ret; 2381 return ret;
1676} 2382}
1677static void *xmalloc(size_t size)
1678{
1679 void *ret = malloc(size);
1680 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1681 return ret;
1682}
1683static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
1684{
1685 size_t new_len;
1686 2383
1687 new_len = strlen(*dst) + strlen(src); 2384static char **get_split_env(const char *envvar)
1688 if (*curr_len <= new_len) {
1689 *curr_len = new_len + (*curr_len / 2);
1690 *dst = realloc(*dst, *curr_len);
1691 if (!*dst)
1692 err("could not realloc() %li bytes", (unsigned long)*curr_len);
1693 }
1694
1695 if (n)
1696 strncat(*dst, src, n);
1697 else
1698 strcat(*dst, src);
1699}
1700static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1701{ 2385{
1702 static char my_app[2]; 2386 const char *delims = " \t\n";
1703 my_app[0] = append; 2387 char **envvals = NULL;
1704 my_app[1] = '\0'; 2388 char *env, *s;
1705 xstrcat(dst, my_app, curr_len); 2389 int nentry;
1706}
1707 2390
2391 if ((env = getenv(envvar)) == NULL)
2392 return NULL;
1708 2393
2394 env = xstrdup(env);
2395 if (env == NULL)
2396 return NULL;
2397
2398 s = strtok(env, delims);
2399 if (s == NULL) {
2400 free(env);
2401 return NULL;
2402 }
2403
2404 nentry = 0;
2405 while (s != NULL) {
2406 ++nentry;
2407 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
2408 envvals[nentry-1] = s;
2409 s = strtok(NULL, delims);
2410 }
2411 envvals[nentry] = NULL;
2412
2413 /* don't want to free(env) as it contains the memory that backs
2414 * the envvals array of strings */
2415 return envvals;
2416}
2417
2418static void parseenv(void)
2419{
2420 color_init(false);
2421 qa_textrels = get_split_env("QA_TEXTRELS");
2422 qa_execstack = get_split_env("QA_EXECSTACK");
2423 qa_wx_load = get_split_env("QA_WX_LOAD");
2424}
2425
2426#ifdef __PAX_UTILS_CLEANUP
2427static void cleanup(void)
2428{
2429 free(out_format);
2430 free(qa_textrels);
2431 free(qa_execstack);
2432 free(qa_wx_load);
2433}
2434#endif
1709 2435
1710int main(int argc, char *argv[]) 2436int main(int argc, char *argv[])
1711{ 2437{
2438 int ret;
1712 if (argc < 2) 2439 if (argc < 2)
1713 usage(EXIT_FAILURE); 2440 usage(EXIT_FAILURE);
2441 parseenv();
1714 parseargs(argc, argv); 2442 ret = parseargs(argc, argv);
1715 fclose(stdout); 2443 fclose(stdout);
1716#ifdef __BOUNDS_CHECKING_ON 2444#ifdef __PAX_UTILS_CLEANUP
1717 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()"); 2445 cleanup();
2446 warn("The calls to add/delete heap should be off:\n"
2447 "\t- 1 due to the out_buffer not being freed in scanelf_fileat()\n"
2448 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
1718#endif 2449#endif
1719 return EXIT_SUCCESS; 2450 return ret;
1720} 2451}
2452
2453/* Match filename against entries in matchlist, return TRUE
2454 * if the file is listed */
2455static int file_matches_list(const char *filename, char **matchlist)
2456{
2457 char **file;
2458 char *match;
2459 char buf[__PAX_UTILS_PATH_MAX];
2460
2461 if (matchlist == NULL)
2462 return 0;
2463
2464 for (file = matchlist; *file != NULL; file++) {
2465 if (search_path) {
2466 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2467 match = buf;
2468 } else {
2469 match = *file;
2470 }
2471 if (fnmatch(match, filename, 0) == 0)
2472 return 1;
2473 }
2474 return 0;
2475}

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